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6126 lines
174 KiB
6126 lines
174 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* USB hub driver. |
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* |
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* (C) Copyright 1999 Linus Torvalds |
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* (C) Copyright 1999 Johannes Erdfelt |
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* (C) Copyright 1999 Gregory P. Smith |
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* (C) Copyright 2001 Brad Hards ([email protected]) |
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* |
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* Released under the GPLv2 only. |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/completion.h> |
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#include <linux/sched/mm.h> |
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#include <linux/list.h> |
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#include <linux/slab.h> |
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#include <linux/kcov.h> |
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#include <linux/ioctl.h> |
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#include <linux/usb.h> |
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#include <linux/usbdevice_fs.h> |
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#include <linux/usb/hcd.h> |
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#include <linux/usb/otg.h> |
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#include <linux/usb/quirks.h> |
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#include <linux/workqueue.h> |
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#include <linux/mutex.h> |
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#include <linux/random.h> |
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#include <linux/pm_qos.h> |
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#include <linux/kobject.h> |
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|
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#include <linux/uaccess.h> |
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#include <asm/byteorder.h> |
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|
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#include "hub.h" |
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#include "otg_productlist.h" |
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|
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#define USB_VENDOR_GENESYS_LOGIC 0x05e3 |
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#define USB_VENDOR_SMSC 0x0424 |
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#define USB_PRODUCT_USB5534B 0x5534 |
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#define HUB_QUIRK_CHECK_PORT_AUTOSUSPEND 0x01 |
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#define HUB_QUIRK_DISABLE_AUTOSUSPEND 0x02 |
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|
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#define USB_TP_TRANSMISSION_DELAY 40 /* ns */ |
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#define USB_TP_TRANSMISSION_DELAY_MAX 65535 /* ns */ |
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|
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/* Protect struct usb_device->state and ->children members |
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* Note: Both are also protected by ->dev.sem, except that ->state can |
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* change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */ |
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static DEFINE_SPINLOCK(device_state_lock); |
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|
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/* workqueue to process hub events */ |
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static struct workqueue_struct *hub_wq; |
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static void hub_event(struct work_struct *work); |
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|
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/* synchronize hub-port add/remove and peering operations */ |
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DEFINE_MUTEX(usb_port_peer_mutex); |
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|
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/* cycle leds on hubs that aren't blinking for attention */ |
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static bool blinkenlights; |
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module_param(blinkenlights, bool, S_IRUGO); |
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MODULE_PARM_DESC(blinkenlights, "true to cycle leds on hubs"); |
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|
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/* |
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* Device SATA8000 FW1.0 from DATAST0R Technology Corp requires about |
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* 10 seconds to send reply for the initial 64-byte descriptor request. |
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*/ |
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/* define initial 64-byte descriptor request timeout in milliseconds */ |
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static int initial_descriptor_timeout = USB_CTRL_GET_TIMEOUT; |
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module_param(initial_descriptor_timeout, int, S_IRUGO|S_IWUSR); |
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MODULE_PARM_DESC(initial_descriptor_timeout, |
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"initial 64-byte descriptor request timeout in milliseconds " |
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"(default 5000 - 5.0 seconds)"); |
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|
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/* |
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* As of 2.6.10 we introduce a new USB device initialization scheme which |
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* closely resembles the way Windows works. Hopefully it will be compatible |
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* with a wider range of devices than the old scheme. However some previously |
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* working devices may start giving rise to "device not accepting address" |
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* errors; if that happens the user can try the old scheme by adjusting the |
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* following module parameters. |
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* |
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* For maximum flexibility there are two boolean parameters to control the |
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* hub driver's behavior. On the first initialization attempt, if the |
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* "old_scheme_first" parameter is set then the old scheme will be used, |
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* otherwise the new scheme is used. If that fails and "use_both_schemes" |
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* is set, then the driver will make another attempt, using the other scheme. |
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*/ |
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static bool old_scheme_first; |
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module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR); |
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MODULE_PARM_DESC(old_scheme_first, |
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"start with the old device initialization scheme"); |
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|
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static bool use_both_schemes = true; |
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module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR); |
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MODULE_PARM_DESC(use_both_schemes, |
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"try the other device initialization scheme if the " |
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"first one fails"); |
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|
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/* Mutual exclusion for EHCI CF initialization. This interferes with |
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* port reset on some companion controllers. |
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*/ |
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DECLARE_RWSEM(ehci_cf_port_reset_rwsem); |
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EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); |
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|
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#define HUB_DEBOUNCE_TIMEOUT 2000 |
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#define HUB_DEBOUNCE_STEP 25 |
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#define HUB_DEBOUNCE_STABLE 100 |
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|
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static void hub_release(struct kref *kref); |
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static int usb_reset_and_verify_device(struct usb_device *udev); |
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static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); |
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static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
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u16 portstatus); |
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|
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static inline char *portspeed(struct usb_hub *hub, int portstatus) |
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{ |
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if (hub_is_superspeedplus(hub->hdev)) |
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return "10.0 Gb/s"; |
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if (hub_is_superspeed(hub->hdev)) |
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return "5.0 Gb/s"; |
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if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
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return "480 Mb/s"; |
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else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
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return "1.5 Mb/s"; |
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else |
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return "12 Mb/s"; |
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} |
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|
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/* Note that hdev or one of its children must be locked! */ |
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struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev) |
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{ |
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if (!hdev || !hdev->actconfig || !hdev->maxchild) |
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return NULL; |
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return usb_get_intfdata(hdev->actconfig->interface[0]); |
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} |
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|
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int usb_device_supports_lpm(struct usb_device *udev) |
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{ |
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/* Some devices have trouble with LPM */ |
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if (udev->quirks & USB_QUIRK_NO_LPM) |
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return 0; |
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|
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/* USB 2.1 (and greater) devices indicate LPM support through |
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* their USB 2.0 Extended Capabilities BOS descriptor. |
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*/ |
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if (udev->speed == USB_SPEED_HIGH || udev->speed == USB_SPEED_FULL) { |
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if (udev->bos->ext_cap && |
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(USB_LPM_SUPPORT & |
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le32_to_cpu(udev->bos->ext_cap->bmAttributes))) |
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return 1; |
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return 0; |
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} |
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|
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/* |
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* According to the USB 3.0 spec, all USB 3.0 devices must support LPM. |
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* However, there are some that don't, and they set the U1/U2 exit |
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* latencies to zero. |
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*/ |
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if (!udev->bos->ss_cap) { |
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dev_info(&udev->dev, "No LPM exit latency info found, disabling LPM.\n"); |
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return 0; |
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} |
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|
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if (udev->bos->ss_cap->bU1devExitLat == 0 && |
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udev->bos->ss_cap->bU2DevExitLat == 0) { |
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if (udev->parent) |
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dev_info(&udev->dev, "LPM exit latency is zeroed, disabling LPM.\n"); |
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else |
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dev_info(&udev->dev, "We don't know the algorithms for LPM for this host, disabling LPM.\n"); |
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return 0; |
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} |
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|
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if (!udev->parent || udev->parent->lpm_capable) |
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return 1; |
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return 0; |
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} |
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|
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/* |
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* Set the Maximum Exit Latency (MEL) for the host to initiate a transition from |
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* either U1 or U2. |
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*/ |
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static void usb_set_lpm_mel(struct usb_device *udev, |
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struct usb3_lpm_parameters *udev_lpm_params, |
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unsigned int udev_exit_latency, |
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struct usb_hub *hub, |
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struct usb3_lpm_parameters *hub_lpm_params, |
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unsigned int hub_exit_latency) |
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{ |
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unsigned int total_mel; |
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unsigned int device_mel; |
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unsigned int hub_mel; |
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|
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/* |
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* Calculate the time it takes to transition all links from the roothub |
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* to the parent hub into U0. The parent hub must then decode the |
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* packet (hub header decode latency) to figure out which port it was |
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* bound for. |
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* |
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* The Hub Header decode latency is expressed in 0.1us intervals (0x1 |
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* means 0.1us). Multiply that by 100 to get nanoseconds. |
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*/ |
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total_mel = hub_lpm_params->mel + |
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(hub->descriptor->u.ss.bHubHdrDecLat * 100); |
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|
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/* |
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* How long will it take to transition the downstream hub's port into |
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* U0? The greater of either the hub exit latency or the device exit |
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* latency. |
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* |
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* The BOS U1/U2 exit latencies are expressed in 1us intervals. |
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* Multiply that by 1000 to get nanoseconds. |
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*/ |
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device_mel = udev_exit_latency * 1000; |
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hub_mel = hub_exit_latency * 1000; |
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if (device_mel > hub_mel) |
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total_mel += device_mel; |
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else |
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total_mel += hub_mel; |
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|
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udev_lpm_params->mel = total_mel; |
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} |
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|
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/* |
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* Set the maximum Device to Host Exit Latency (PEL) for the device to initiate |
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* a transition from either U1 or U2. |
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*/ |
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static void usb_set_lpm_pel(struct usb_device *udev, |
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struct usb3_lpm_parameters *udev_lpm_params, |
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unsigned int udev_exit_latency, |
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struct usb_hub *hub, |
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struct usb3_lpm_parameters *hub_lpm_params, |
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unsigned int hub_exit_latency, |
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unsigned int port_to_port_exit_latency) |
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{ |
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unsigned int first_link_pel; |
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unsigned int hub_pel; |
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|
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/* |
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* First, the device sends an LFPS to transition the link between the |
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* device and the parent hub into U0. The exit latency is the bigger of |
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* the device exit latency or the hub exit latency. |
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*/ |
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if (udev_exit_latency > hub_exit_latency) |
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first_link_pel = udev_exit_latency * 1000; |
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else |
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first_link_pel = hub_exit_latency * 1000; |
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|
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/* |
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* When the hub starts to receive the LFPS, there is a slight delay for |
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* it to figure out that one of the ports is sending an LFPS. Then it |
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* will forward the LFPS to its upstream link. The exit latency is the |
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* delay, plus the PEL that we calculated for this hub. |
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*/ |
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hub_pel = port_to_port_exit_latency * 1000 + hub_lpm_params->pel; |
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|
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/* |
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* According to figure C-7 in the USB 3.0 spec, the PEL for this device |
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* is the greater of the two exit latencies. |
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*/ |
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if (first_link_pel > hub_pel) |
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udev_lpm_params->pel = first_link_pel; |
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else |
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udev_lpm_params->pel = hub_pel; |
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} |
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|
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/* |
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* Set the System Exit Latency (SEL) to indicate the total worst-case time from |
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* when a device initiates a transition to U0, until when it will receive the |
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* first packet from the host controller. |
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* |
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* Section C.1.5.1 describes the four components to this: |
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* - t1: device PEL |
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* - t2: time for the ERDY to make it from the device to the host. |
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* - t3: a host-specific delay to process the ERDY. |
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* - t4: time for the packet to make it from the host to the device. |
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* |
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* t3 is specific to both the xHCI host and the platform the host is integrated |
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* into. The Intel HW folks have said it's negligible, FIXME if a different |
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* vendor says otherwise. |
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*/ |
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static void usb_set_lpm_sel(struct usb_device *udev, |
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struct usb3_lpm_parameters *udev_lpm_params) |
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{ |
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struct usb_device *parent; |
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unsigned int num_hubs; |
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unsigned int total_sel; |
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|
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/* t1 = device PEL */ |
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total_sel = udev_lpm_params->pel; |
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/* How many external hubs are in between the device & the root port. */ |
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for (parent = udev->parent, num_hubs = 0; parent->parent; |
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parent = parent->parent) |
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num_hubs++; |
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/* t2 = 2.1us + 250ns * (num_hubs - 1) */ |
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if (num_hubs > 0) |
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total_sel += 2100 + 250 * (num_hubs - 1); |
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|
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/* t4 = 250ns * num_hubs */ |
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total_sel += 250 * num_hubs; |
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|
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udev_lpm_params->sel = total_sel; |
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} |
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|
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static void usb_set_lpm_parameters(struct usb_device *udev) |
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{ |
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struct usb_hub *hub; |
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unsigned int port_to_port_delay; |
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unsigned int udev_u1_del; |
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unsigned int udev_u2_del; |
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unsigned int hub_u1_del; |
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unsigned int hub_u2_del; |
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|
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if (!udev->lpm_capable || udev->speed < USB_SPEED_SUPER) |
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return; |
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|
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hub = usb_hub_to_struct_hub(udev->parent); |
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/* It doesn't take time to transition the roothub into U0, since it |
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* doesn't have an upstream link. |
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*/ |
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if (!hub) |
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return; |
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|
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udev_u1_del = udev->bos->ss_cap->bU1devExitLat; |
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udev_u2_del = le16_to_cpu(udev->bos->ss_cap->bU2DevExitLat); |
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hub_u1_del = udev->parent->bos->ss_cap->bU1devExitLat; |
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hub_u2_del = le16_to_cpu(udev->parent->bos->ss_cap->bU2DevExitLat); |
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|
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usb_set_lpm_mel(udev, &udev->u1_params, udev_u1_del, |
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hub, &udev->parent->u1_params, hub_u1_del); |
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|
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usb_set_lpm_mel(udev, &udev->u2_params, udev_u2_del, |
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hub, &udev->parent->u2_params, hub_u2_del); |
|
|
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/* |
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* Appendix C, section C.2.2.2, says that there is a slight delay from |
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* when the parent hub notices the downstream port is trying to |
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* transition to U0 to when the hub initiates a U0 transition on its |
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* upstream port. The section says the delays are tPort2PortU1EL and |
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* tPort2PortU2EL, but it doesn't define what they are. |
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* |
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* The hub chapter, sections 10.4.2.4 and 10.4.2.5 seem to be talking |
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* about the same delays. Use the maximum delay calculations from those |
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* sections. For U1, it's tHubPort2PortExitLat, which is 1us max. For |
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* U2, it's tHubPort2PortExitLat + U2DevExitLat - U1DevExitLat. I |
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* assume the device exit latencies they are talking about are the hub |
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* exit latencies. |
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* |
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* What do we do if the U2 exit latency is less than the U1 exit |
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* latency? It's possible, although not likely... |
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*/ |
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port_to_port_delay = 1; |
|
|
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usb_set_lpm_pel(udev, &udev->u1_params, udev_u1_del, |
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hub, &udev->parent->u1_params, hub_u1_del, |
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port_to_port_delay); |
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|
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if (hub_u2_del > hub_u1_del) |
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port_to_port_delay = 1 + hub_u2_del - hub_u1_del; |
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else |
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port_to_port_delay = 1 + hub_u1_del; |
|
|
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usb_set_lpm_pel(udev, &udev->u2_params, udev_u2_del, |
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hub, &udev->parent->u2_params, hub_u2_del, |
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port_to_port_delay); |
|
|
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/* Now that we've got PEL, calculate SEL. */ |
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usb_set_lpm_sel(udev, &udev->u1_params); |
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usb_set_lpm_sel(udev, &udev->u2_params); |
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} |
|
|
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/* USB 2.0 spec Section 11.24.4.5 */ |
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static int get_hub_descriptor(struct usb_device *hdev, |
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struct usb_hub_descriptor *desc) |
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{ |
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int i, ret, size; |
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unsigned dtype; |
|
|
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if (hub_is_superspeed(hdev)) { |
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dtype = USB_DT_SS_HUB; |
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size = USB_DT_SS_HUB_SIZE; |
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} else { |
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dtype = USB_DT_HUB; |
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size = sizeof(struct usb_hub_descriptor); |
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} |
|
|
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for (i = 0; i < 3; i++) { |
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ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
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USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, |
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dtype << 8, 0, desc, size, |
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USB_CTRL_GET_TIMEOUT); |
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if (hub_is_superspeed(hdev)) { |
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if (ret == size) |
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return ret; |
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} else if (ret >= USB_DT_HUB_NONVAR_SIZE + 2) { |
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/* Make sure we have the DeviceRemovable field. */ |
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size = USB_DT_HUB_NONVAR_SIZE + desc->bNbrPorts / 8 + 1; |
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if (ret < size) |
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return -EMSGSIZE; |
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return ret; |
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} |
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} |
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return -EINVAL; |
|
} |
|
|
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/* |
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* USB 2.0 spec Section 11.24.2.1 |
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*/ |
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static int clear_hub_feature(struct usb_device *hdev, int feature) |
|
{ |
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return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
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USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000); |
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} |
|
|
|
/* |
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* USB 2.0 spec Section 11.24.2.2 |
|
*/ |
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int usb_clear_port_feature(struct usb_device *hdev, int port1, int feature) |
|
{ |
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return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
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USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1, |
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NULL, 0, 1000); |
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} |
|
|
|
/* |
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* USB 2.0 spec Section 11.24.2.13 |
|
*/ |
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static int set_port_feature(struct usb_device *hdev, int port1, int feature) |
|
{ |
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return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
|
USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1, |
|
NULL, 0, 1000); |
|
} |
|
|
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static char *to_led_name(int selector) |
|
{ |
|
switch (selector) { |
|
case HUB_LED_AMBER: |
|
return "amber"; |
|
case HUB_LED_GREEN: |
|
return "green"; |
|
case HUB_LED_OFF: |
|
return "off"; |
|
case HUB_LED_AUTO: |
|
return "auto"; |
|
default: |
|
return "??"; |
|
} |
|
} |
|
|
|
/* |
|
* USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7 |
|
* for info about using port indicators |
|
*/ |
|
static void set_port_led(struct usb_hub *hub, int port1, int selector) |
|
{ |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
int status; |
|
|
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status = set_port_feature(hub->hdev, (selector << 8) | port1, |
|
USB_PORT_FEAT_INDICATOR); |
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dev_dbg(&port_dev->dev, "indicator %s status %d\n", |
|
to_led_name(selector), status); |
|
} |
|
|
|
#define LED_CYCLE_PERIOD ((2*HZ)/3) |
|
|
|
static void led_work(struct work_struct *work) |
|
{ |
|
struct usb_hub *hub = |
|
container_of(work, struct usb_hub, leds.work); |
|
struct usb_device *hdev = hub->hdev; |
|
unsigned i; |
|
unsigned changed = 0; |
|
int cursor = -1; |
|
|
|
if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing) |
|
return; |
|
|
|
for (i = 0; i < hdev->maxchild; i++) { |
|
unsigned selector, mode; |
|
|
|
/* 30%-50% duty cycle */ |
|
|
|
switch (hub->indicator[i]) { |
|
/* cycle marker */ |
|
case INDICATOR_CYCLE: |
|
cursor = i; |
|
selector = HUB_LED_AUTO; |
|
mode = INDICATOR_AUTO; |
|
break; |
|
/* blinking green = sw attention */ |
|
case INDICATOR_GREEN_BLINK: |
|
selector = HUB_LED_GREEN; |
|
mode = INDICATOR_GREEN_BLINK_OFF; |
|
break; |
|
case INDICATOR_GREEN_BLINK_OFF: |
|
selector = HUB_LED_OFF; |
|
mode = INDICATOR_GREEN_BLINK; |
|
break; |
|
/* blinking amber = hw attention */ |
|
case INDICATOR_AMBER_BLINK: |
|
selector = HUB_LED_AMBER; |
|
mode = INDICATOR_AMBER_BLINK_OFF; |
|
break; |
|
case INDICATOR_AMBER_BLINK_OFF: |
|
selector = HUB_LED_OFF; |
|
mode = INDICATOR_AMBER_BLINK; |
|
break; |
|
/* blink green/amber = reserved */ |
|
case INDICATOR_ALT_BLINK: |
|
selector = HUB_LED_GREEN; |
|
mode = INDICATOR_ALT_BLINK_OFF; |
|
break; |
|
case INDICATOR_ALT_BLINK_OFF: |
|
selector = HUB_LED_AMBER; |
|
mode = INDICATOR_ALT_BLINK; |
|
break; |
|
default: |
|
continue; |
|
} |
|
if (selector != HUB_LED_AUTO) |
|
changed = 1; |
|
set_port_led(hub, i + 1, selector); |
|
hub->indicator[i] = mode; |
|
} |
|
if (!changed && blinkenlights) { |
|
cursor++; |
|
cursor %= hdev->maxchild; |
|
set_port_led(hub, cursor + 1, HUB_LED_GREEN); |
|
hub->indicator[cursor] = INDICATOR_CYCLE; |
|
changed++; |
|
} |
|
if (changed) |
|
queue_delayed_work(system_power_efficient_wq, |
|
&hub->leds, LED_CYCLE_PERIOD); |
|
} |
|
|
|
/* use a short timeout for hub/port status fetches */ |
|
#define USB_STS_TIMEOUT 1000 |
|
#define USB_STS_RETRIES 5 |
|
|
|
/* |
|
* USB 2.0 spec Section 11.24.2.6 |
|
*/ |
|
static int get_hub_status(struct usb_device *hdev, |
|
struct usb_hub_status *data) |
|
{ |
|
int i, status = -ETIMEDOUT; |
|
|
|
for (i = 0; i < USB_STS_RETRIES && |
|
(status == -ETIMEDOUT || status == -EPIPE); i++) { |
|
status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
|
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, |
|
data, sizeof(*data), USB_STS_TIMEOUT); |
|
} |
|
return status; |
|
} |
|
|
|
/* |
|
* USB 2.0 spec Section 11.24.2.7 |
|
* USB 3.1 takes into use the wValue and wLength fields, spec Section 10.16.2.6 |
|
*/ |
|
static int get_port_status(struct usb_device *hdev, int port1, |
|
void *data, u16 value, u16 length) |
|
{ |
|
int i, status = -ETIMEDOUT; |
|
|
|
for (i = 0; i < USB_STS_RETRIES && |
|
(status == -ETIMEDOUT || status == -EPIPE); i++) { |
|
status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0), |
|
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, value, |
|
port1, data, length, USB_STS_TIMEOUT); |
|
} |
|
return status; |
|
} |
|
|
|
static int hub_ext_port_status(struct usb_hub *hub, int port1, int type, |
|
u16 *status, u16 *change, u32 *ext_status) |
|
{ |
|
int ret; |
|
int len = 4; |
|
|
|
if (type != HUB_PORT_STATUS) |
|
len = 8; |
|
|
|
mutex_lock(&hub->status_mutex); |
|
ret = get_port_status(hub->hdev, port1, &hub->status->port, type, len); |
|
if (ret < len) { |
|
if (ret != -ENODEV) |
|
dev_err(hub->intfdev, |
|
"%s failed (err = %d)\n", __func__, ret); |
|
if (ret >= 0) |
|
ret = -EIO; |
|
} else { |
|
*status = le16_to_cpu(hub->status->port.wPortStatus); |
|
*change = le16_to_cpu(hub->status->port.wPortChange); |
|
if (type != HUB_PORT_STATUS && ext_status) |
|
*ext_status = le32_to_cpu( |
|
hub->status->port.dwExtPortStatus); |
|
ret = 0; |
|
} |
|
mutex_unlock(&hub->status_mutex); |
|
return ret; |
|
} |
|
|
|
static int hub_port_status(struct usb_hub *hub, int port1, |
|
u16 *status, u16 *change) |
|
{ |
|
return hub_ext_port_status(hub, port1, HUB_PORT_STATUS, |
|
status, change, NULL); |
|
} |
|
|
|
static void hub_resubmit_irq_urb(struct usb_hub *hub) |
|
{ |
|
unsigned long flags; |
|
int status; |
|
|
|
spin_lock_irqsave(&hub->irq_urb_lock, flags); |
|
|
|
if (hub->quiescing) { |
|
spin_unlock_irqrestore(&hub->irq_urb_lock, flags); |
|
return; |
|
} |
|
|
|
status = usb_submit_urb(hub->urb, GFP_ATOMIC); |
|
if (status && status != -ENODEV && status != -EPERM && |
|
status != -ESHUTDOWN) { |
|
dev_err(hub->intfdev, "resubmit --> %d\n", status); |
|
mod_timer(&hub->irq_urb_retry, jiffies + HZ); |
|
} |
|
|
|
spin_unlock_irqrestore(&hub->irq_urb_lock, flags); |
|
} |
|
|
|
static void hub_retry_irq_urb(struct timer_list *t) |
|
{ |
|
struct usb_hub *hub = from_timer(hub, t, irq_urb_retry); |
|
|
|
hub_resubmit_irq_urb(hub); |
|
} |
|
|
|
|
|
static void kick_hub_wq(struct usb_hub *hub) |
|
{ |
|
struct usb_interface *intf; |
|
|
|
if (hub->disconnected || work_pending(&hub->events)) |
|
return; |
|
|
|
/* |
|
* Suppress autosuspend until the event is proceed. |
|
* |
|
* Be careful and make sure that the symmetric operation is |
|
* always called. We are here only when there is no pending |
|
* work for this hub. Therefore put the interface either when |
|
* the new work is called or when it is canceled. |
|
*/ |
|
intf = to_usb_interface(hub->intfdev); |
|
usb_autopm_get_interface_no_resume(intf); |
|
kref_get(&hub->kref); |
|
|
|
if (queue_work(hub_wq, &hub->events)) |
|
return; |
|
|
|
/* the work has already been scheduled */ |
|
usb_autopm_put_interface_async(intf); |
|
kref_put(&hub->kref, hub_release); |
|
} |
|
|
|
void usb_kick_hub_wq(struct usb_device *hdev) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
|
|
|
if (hub) |
|
kick_hub_wq(hub); |
|
} |
|
|
|
/* |
|
* Let the USB core know that a USB 3.0 device has sent a Function Wake Device |
|
* Notification, which indicates it had initiated remote wakeup. |
|
* |
|
* USB 3.0 hubs do not report the port link state change from U3 to U0 when the |
|
* device initiates resume, so the USB core will not receive notice of the |
|
* resume through the normal hub interrupt URB. |
|
*/ |
|
void usb_wakeup_notification(struct usb_device *hdev, |
|
unsigned int portnum) |
|
{ |
|
struct usb_hub *hub; |
|
struct usb_port *port_dev; |
|
|
|
if (!hdev) |
|
return; |
|
|
|
hub = usb_hub_to_struct_hub(hdev); |
|
if (hub) { |
|
port_dev = hub->ports[portnum - 1]; |
|
if (port_dev && port_dev->child) |
|
pm_wakeup_event(&port_dev->child->dev, 0); |
|
|
|
set_bit(portnum, hub->wakeup_bits); |
|
kick_hub_wq(hub); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(usb_wakeup_notification); |
|
|
|
/* completion function, fires on port status changes and various faults */ |
|
static void hub_irq(struct urb *urb) |
|
{ |
|
struct usb_hub *hub = urb->context; |
|
int status = urb->status; |
|
unsigned i; |
|
unsigned long bits; |
|
|
|
switch (status) { |
|
case -ENOENT: /* synchronous unlink */ |
|
case -ECONNRESET: /* async unlink */ |
|
case -ESHUTDOWN: /* hardware going away */ |
|
return; |
|
|
|
default: /* presumably an error */ |
|
/* Cause a hub reset after 10 consecutive errors */ |
|
dev_dbg(hub->intfdev, "transfer --> %d\n", status); |
|
if ((++hub->nerrors < 10) || hub->error) |
|
goto resubmit; |
|
hub->error = status; |
|
fallthrough; |
|
|
|
/* let hub_wq handle things */ |
|
case 0: /* we got data: port status changed */ |
|
bits = 0; |
|
for (i = 0; i < urb->actual_length; ++i) |
|
bits |= ((unsigned long) ((*hub->buffer)[i])) |
|
<< (i*8); |
|
hub->event_bits[0] = bits; |
|
break; |
|
} |
|
|
|
hub->nerrors = 0; |
|
|
|
/* Something happened, let hub_wq figure it out */ |
|
kick_hub_wq(hub); |
|
|
|
resubmit: |
|
hub_resubmit_irq_urb(hub); |
|
} |
|
|
|
/* USB 2.0 spec Section 11.24.2.3 */ |
|
static inline int |
|
hub_clear_tt_buffer(struct usb_device *hdev, u16 devinfo, u16 tt) |
|
{ |
|
/* Need to clear both directions for control ep */ |
|
if (((devinfo >> 11) & USB_ENDPOINT_XFERTYPE_MASK) == |
|
USB_ENDPOINT_XFER_CONTROL) { |
|
int status = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
|
HUB_CLEAR_TT_BUFFER, USB_RT_PORT, |
|
devinfo ^ 0x8000, tt, NULL, 0, 1000); |
|
if (status) |
|
return status; |
|
} |
|
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
|
HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo, |
|
tt, NULL, 0, 1000); |
|
} |
|
|
|
/* |
|
* enumeration blocks hub_wq for a long time. we use keventd instead, since |
|
* long blocking there is the exception, not the rule. accordingly, HCDs |
|
* talking to TTs must queue control transfers (not just bulk and iso), so |
|
* both can talk to the same hub concurrently. |
|
*/ |
|
static void hub_tt_work(struct work_struct *work) |
|
{ |
|
struct usb_hub *hub = |
|
container_of(work, struct usb_hub, tt.clear_work); |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&hub->tt.lock, flags); |
|
while (!list_empty(&hub->tt.clear_list)) { |
|
struct list_head *next; |
|
struct usb_tt_clear *clear; |
|
struct usb_device *hdev = hub->hdev; |
|
const struct hc_driver *drv; |
|
int status; |
|
|
|
next = hub->tt.clear_list.next; |
|
clear = list_entry(next, struct usb_tt_clear, clear_list); |
|
list_del(&clear->clear_list); |
|
|
|
/* drop lock so HCD can concurrently report other TT errors */ |
|
spin_unlock_irqrestore(&hub->tt.lock, flags); |
|
status = hub_clear_tt_buffer(hdev, clear->devinfo, clear->tt); |
|
if (status && status != -ENODEV) |
|
dev_err(&hdev->dev, |
|
"clear tt %d (%04x) error %d\n", |
|
clear->tt, clear->devinfo, status); |
|
|
|
/* Tell the HCD, even if the operation failed */ |
|
drv = clear->hcd->driver; |
|
if (drv->clear_tt_buffer_complete) |
|
(drv->clear_tt_buffer_complete)(clear->hcd, clear->ep); |
|
|
|
kfree(clear); |
|
spin_lock_irqsave(&hub->tt.lock, flags); |
|
} |
|
spin_unlock_irqrestore(&hub->tt.lock, flags); |
|
} |
|
|
|
/** |
|
* usb_hub_set_port_power - control hub port's power state |
|
* @hdev: USB device belonging to the usb hub |
|
* @hub: target hub |
|
* @port1: port index |
|
* @set: expected status |
|
* |
|
* call this function to control port's power via setting or |
|
* clearing the port's PORT_POWER feature. |
|
* |
|
* Return: 0 if successful. A negative error code otherwise. |
|
*/ |
|
int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub, |
|
int port1, bool set) |
|
{ |
|
int ret; |
|
|
|
if (set) |
|
ret = set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
|
else |
|
ret = usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
if (set) |
|
set_bit(port1, hub->power_bits); |
|
else |
|
clear_bit(port1, hub->power_bits); |
|
return 0; |
|
} |
|
|
|
/** |
|
* usb_hub_clear_tt_buffer - clear control/bulk TT state in high speed hub |
|
* @urb: an URB associated with the failed or incomplete split transaction |
|
* |
|
* High speed HCDs use this to tell the hub driver that some split control or |
|
* bulk transaction failed in a way that requires clearing internal state of |
|
* a transaction translator. This is normally detected (and reported) from |
|
* interrupt context. |
|
* |
|
* It may not be possible for that hub to handle additional full (or low) |
|
* speed transactions until that state is fully cleared out. |
|
* |
|
* Return: 0 if successful. A negative error code otherwise. |
|
*/ |
|
int usb_hub_clear_tt_buffer(struct urb *urb) |
|
{ |
|
struct usb_device *udev = urb->dev; |
|
int pipe = urb->pipe; |
|
struct usb_tt *tt = udev->tt; |
|
unsigned long flags; |
|
struct usb_tt_clear *clear; |
|
|
|
/* we've got to cope with an arbitrary number of pending TT clears, |
|
* since each TT has "at least two" buffers that can need it (and |
|
* there can be many TTs per hub). even if they're uncommon. |
|
*/ |
|
clear = kmalloc(sizeof *clear, GFP_ATOMIC); |
|
if (clear == NULL) { |
|
dev_err(&udev->dev, "can't save CLEAR_TT_BUFFER state\n"); |
|
/* FIXME recover somehow ... RESET_TT? */ |
|
return -ENOMEM; |
|
} |
|
|
|
/* info that CLEAR_TT_BUFFER needs */ |
|
clear->tt = tt->multi ? udev->ttport : 1; |
|
clear->devinfo = usb_pipeendpoint (pipe); |
|
clear->devinfo |= ((u16)udev->devaddr) << 4; |
|
clear->devinfo |= usb_pipecontrol(pipe) |
|
? (USB_ENDPOINT_XFER_CONTROL << 11) |
|
: (USB_ENDPOINT_XFER_BULK << 11); |
|
if (usb_pipein(pipe)) |
|
clear->devinfo |= 1 << 15; |
|
|
|
/* info for completion callback */ |
|
clear->hcd = bus_to_hcd(udev->bus); |
|
clear->ep = urb->ep; |
|
|
|
/* tell keventd to clear state for this TT */ |
|
spin_lock_irqsave(&tt->lock, flags); |
|
list_add_tail(&clear->clear_list, &tt->clear_list); |
|
schedule_work(&tt->clear_work); |
|
spin_unlock_irqrestore(&tt->lock, flags); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_hub_clear_tt_buffer); |
|
|
|
static void hub_power_on(struct usb_hub *hub, bool do_delay) |
|
{ |
|
int port1; |
|
|
|
/* Enable power on each port. Some hubs have reserved values |
|
* of LPSM (> 2) in their descriptors, even though they are |
|
* USB 2.0 hubs. Some hubs do not implement port-power switching |
|
* but only emulate it. In all cases, the ports won't work |
|
* unless we send these messages to the hub. |
|
*/ |
|
if (hub_is_port_power_switchable(hub)) |
|
dev_dbg(hub->intfdev, "enabling power on all ports\n"); |
|
else |
|
dev_dbg(hub->intfdev, "trying to enable port power on " |
|
"non-switchable hub\n"); |
|
for (port1 = 1; port1 <= hub->hdev->maxchild; port1++) |
|
if (test_bit(port1, hub->power_bits)) |
|
set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER); |
|
else |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_POWER); |
|
if (do_delay) |
|
msleep(hub_power_on_good_delay(hub)); |
|
} |
|
|
|
static int hub_hub_status(struct usb_hub *hub, |
|
u16 *status, u16 *change) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&hub->status_mutex); |
|
ret = get_hub_status(hub->hdev, &hub->status->hub); |
|
if (ret < 0) { |
|
if (ret != -ENODEV) |
|
dev_err(hub->intfdev, |
|
"%s failed (err = %d)\n", __func__, ret); |
|
} else { |
|
*status = le16_to_cpu(hub->status->hub.wHubStatus); |
|
*change = le16_to_cpu(hub->status->hub.wHubChange); |
|
ret = 0; |
|
} |
|
mutex_unlock(&hub->status_mutex); |
|
return ret; |
|
} |
|
|
|
static int hub_set_port_link_state(struct usb_hub *hub, int port1, |
|
unsigned int link_status) |
|
{ |
|
return set_port_feature(hub->hdev, |
|
port1 | (link_status << 3), |
|
USB_PORT_FEAT_LINK_STATE); |
|
} |
|
|
|
/* |
|
* Disable a port and mark a logical connect-change event, so that some |
|
* time later hub_wq will disconnect() any existing usb_device on the port |
|
* and will re-enumerate if there actually is a device attached. |
|
*/ |
|
static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) |
|
{ |
|
dev_dbg(&hub->ports[port1 - 1]->dev, "logical disconnect\n"); |
|
hub_port_disable(hub, port1, 1); |
|
|
|
/* FIXME let caller ask to power down the port: |
|
* - some devices won't enumerate without a VBUS power cycle |
|
* - SRP saves power that way |
|
* - ... new call, TBD ... |
|
* That's easy if this hub can switch power per-port, and |
|
* hub_wq reactivates the port later (timer, SRP, etc). |
|
* Powerdown must be optional, because of reset/DFU. |
|
*/ |
|
|
|
set_bit(port1, hub->change_bits); |
|
kick_hub_wq(hub); |
|
} |
|
|
|
/** |
|
* usb_remove_device - disable a device's port on its parent hub |
|
* @udev: device to be disabled and removed |
|
* Context: @udev locked, must be able to sleep. |
|
* |
|
* After @udev's port has been disabled, hub_wq is notified and it will |
|
* see that the device has been disconnected. When the device is |
|
* physically unplugged and something is plugged in, the events will |
|
* be received and processed normally. |
|
* |
|
* Return: 0 if successful. A negative error code otherwise. |
|
*/ |
|
int usb_remove_device(struct usb_device *udev) |
|
{ |
|
struct usb_hub *hub; |
|
struct usb_interface *intf; |
|
int ret; |
|
|
|
if (!udev->parent) /* Can't remove a root hub */ |
|
return -EINVAL; |
|
hub = usb_hub_to_struct_hub(udev->parent); |
|
intf = to_usb_interface(hub->intfdev); |
|
|
|
ret = usb_autopm_get_interface(intf); |
|
if (ret < 0) |
|
return ret; |
|
|
|
set_bit(udev->portnum, hub->removed_bits); |
|
hub_port_logical_disconnect(hub, udev->portnum); |
|
usb_autopm_put_interface(intf); |
|
return 0; |
|
} |
|
|
|
enum hub_activation_type { |
|
HUB_INIT, HUB_INIT2, HUB_INIT3, /* INITs must come first */ |
|
HUB_POST_RESET, HUB_RESUME, HUB_RESET_RESUME, |
|
}; |
|
|
|
static void hub_init_func2(struct work_struct *ws); |
|
static void hub_init_func3(struct work_struct *ws); |
|
|
|
static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) |
|
{ |
|
struct usb_device *hdev = hub->hdev; |
|
struct usb_hcd *hcd; |
|
int ret; |
|
int port1; |
|
int status; |
|
bool need_debounce_delay = false; |
|
unsigned delay; |
|
|
|
/* Continue a partial initialization */ |
|
if (type == HUB_INIT2 || type == HUB_INIT3) { |
|
device_lock(&hdev->dev); |
|
|
|
/* Was the hub disconnected while we were waiting? */ |
|
if (hub->disconnected) |
|
goto disconnected; |
|
if (type == HUB_INIT2) |
|
goto init2; |
|
goto init3; |
|
} |
|
kref_get(&hub->kref); |
|
|
|
/* The superspeed hub except for root hub has to use Hub Depth |
|
* value as an offset into the route string to locate the bits |
|
* it uses to determine the downstream port number. So hub driver |
|
* should send a set hub depth request to superspeed hub after |
|
* the superspeed hub is set configuration in initialization or |
|
* reset procedure. |
|
* |
|
* After a resume, port power should still be on. |
|
* For any other type of activation, turn it on. |
|
*/ |
|
if (type != HUB_RESUME) { |
|
if (hdev->parent && hub_is_superspeed(hdev)) { |
|
ret = usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0), |
|
HUB_SET_DEPTH, USB_RT_HUB, |
|
hdev->level - 1, 0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
if (ret < 0) |
|
dev_err(hub->intfdev, |
|
"set hub depth failed\n"); |
|
} |
|
|
|
/* Speed up system boot by using a delayed_work for the |
|
* hub's initial power-up delays. This is pretty awkward |
|
* and the implementation looks like a home-brewed sort of |
|
* setjmp/longjmp, but it saves at least 100 ms for each |
|
* root hub (assuming usbcore is compiled into the kernel |
|
* rather than as a module). It adds up. |
|
* |
|
* This can't be done for HUB_RESUME or HUB_RESET_RESUME |
|
* because for those activation types the ports have to be |
|
* operational when we return. In theory this could be done |
|
* for HUB_POST_RESET, but it's easier not to. |
|
*/ |
|
if (type == HUB_INIT) { |
|
delay = hub_power_on_good_delay(hub); |
|
|
|
hub_power_on(hub, false); |
|
INIT_DELAYED_WORK(&hub->init_work, hub_init_func2); |
|
queue_delayed_work(system_power_efficient_wq, |
|
&hub->init_work, |
|
msecs_to_jiffies(delay)); |
|
|
|
/* Suppress autosuspend until init is done */ |
|
usb_autopm_get_interface_no_resume( |
|
to_usb_interface(hub->intfdev)); |
|
return; /* Continues at init2: below */ |
|
} else if (type == HUB_RESET_RESUME) { |
|
/* The internal host controller state for the hub device |
|
* may be gone after a host power loss on system resume. |
|
* Update the device's info so the HW knows it's a hub. |
|
*/ |
|
hcd = bus_to_hcd(hdev->bus); |
|
if (hcd->driver->update_hub_device) { |
|
ret = hcd->driver->update_hub_device(hcd, hdev, |
|
&hub->tt, GFP_NOIO); |
|
if (ret < 0) { |
|
dev_err(hub->intfdev, |
|
"Host not accepting hub info update\n"); |
|
dev_err(hub->intfdev, |
|
"LS/FS devices and hubs may not work under this hub\n"); |
|
} |
|
} |
|
hub_power_on(hub, true); |
|
} else { |
|
hub_power_on(hub, true); |
|
} |
|
} |
|
init2: |
|
|
|
/* |
|
* Check each port and set hub->change_bits to let hub_wq know |
|
* which ports need attention. |
|
*/ |
|
for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
struct usb_device *udev = port_dev->child; |
|
u16 portstatus, portchange; |
|
|
|
portstatus = portchange = 0; |
|
status = hub_port_status(hub, port1, &portstatus, &portchange); |
|
if (status) |
|
goto abort; |
|
|
|
if (udev || (portstatus & USB_PORT_STAT_CONNECTION)) |
|
dev_dbg(&port_dev->dev, "status %04x change %04x\n", |
|
portstatus, portchange); |
|
|
|
/* |
|
* After anything other than HUB_RESUME (i.e., initialization |
|
* or any sort of reset), every port should be disabled. |
|
* Unconnected ports should likewise be disabled (paranoia), |
|
* and so should ports for which we have no usb_device. |
|
*/ |
|
if ((portstatus & USB_PORT_STAT_ENABLE) && ( |
|
type != HUB_RESUME || |
|
!(portstatus & USB_PORT_STAT_CONNECTION) || |
|
!udev || |
|
udev->state == USB_STATE_NOTATTACHED)) { |
|
/* |
|
* USB3 protocol ports will automatically transition |
|
* to Enabled state when detect an USB3.0 device attach. |
|
* Do not disable USB3 protocol ports, just pretend |
|
* power was lost |
|
*/ |
|
portstatus &= ~USB_PORT_STAT_ENABLE; |
|
if (!hub_is_superspeed(hdev)) |
|
usb_clear_port_feature(hdev, port1, |
|
USB_PORT_FEAT_ENABLE); |
|
} |
|
|
|
/* Make sure a warm-reset request is handled by port_event */ |
|
if (type == HUB_RESUME && |
|
hub_port_warm_reset_required(hub, port1, portstatus)) |
|
set_bit(port1, hub->event_bits); |
|
|
|
/* |
|
* Add debounce if USB3 link is in polling/link training state. |
|
* Link will automatically transition to Enabled state after |
|
* link training completes. |
|
*/ |
|
if (hub_is_superspeed(hdev) && |
|
((portstatus & USB_PORT_STAT_LINK_STATE) == |
|
USB_SS_PORT_LS_POLLING)) |
|
need_debounce_delay = true; |
|
|
|
/* Clear status-change flags; we'll debounce later */ |
|
if (portchange & USB_PORT_STAT_C_CONNECTION) { |
|
need_debounce_delay = true; |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_CONNECTION); |
|
} |
|
if (portchange & USB_PORT_STAT_C_ENABLE) { |
|
need_debounce_delay = true; |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_ENABLE); |
|
} |
|
if (portchange & USB_PORT_STAT_C_RESET) { |
|
need_debounce_delay = true; |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_RESET); |
|
} |
|
if ((portchange & USB_PORT_STAT_C_BH_RESET) && |
|
hub_is_superspeed(hub->hdev)) { |
|
need_debounce_delay = true; |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_BH_PORT_RESET); |
|
} |
|
/* We can forget about a "removed" device when there's a |
|
* physical disconnect or the connect status changes. |
|
*/ |
|
if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
|
(portchange & USB_PORT_STAT_C_CONNECTION)) |
|
clear_bit(port1, hub->removed_bits); |
|
|
|
if (!udev || udev->state == USB_STATE_NOTATTACHED) { |
|
/* Tell hub_wq to disconnect the device or |
|
* check for a new connection or over current condition. |
|
* Based on USB2.0 Spec Section 11.12.5, |
|
* C_PORT_OVER_CURRENT could be set while |
|
* PORT_OVER_CURRENT is not. So check for any of them. |
|
*/ |
|
if (udev || (portstatus & USB_PORT_STAT_CONNECTION) || |
|
(portchange & USB_PORT_STAT_C_CONNECTION) || |
|
(portstatus & USB_PORT_STAT_OVERCURRENT) || |
|
(portchange & USB_PORT_STAT_C_OVERCURRENT)) |
|
set_bit(port1, hub->change_bits); |
|
|
|
} else if (portstatus & USB_PORT_STAT_ENABLE) { |
|
bool port_resumed = (portstatus & |
|
USB_PORT_STAT_LINK_STATE) == |
|
USB_SS_PORT_LS_U0; |
|
/* The power session apparently survived the resume. |
|
* If there was an overcurrent or suspend change |
|
* (i.e., remote wakeup request), have hub_wq |
|
* take care of it. Look at the port link state |
|
* for USB 3.0 hubs, since they don't have a suspend |
|
* change bit, and they don't set the port link change |
|
* bit on device-initiated resume. |
|
*/ |
|
if (portchange || (hub_is_superspeed(hub->hdev) && |
|
port_resumed)) |
|
set_bit(port1, hub->change_bits); |
|
|
|
} else if (udev->persist_enabled) { |
|
#ifdef CONFIG_PM |
|
udev->reset_resume = 1; |
|
#endif |
|
/* Don't set the change_bits when the device |
|
* was powered off. |
|
*/ |
|
if (test_bit(port1, hub->power_bits)) |
|
set_bit(port1, hub->change_bits); |
|
|
|
} else { |
|
/* The power session is gone; tell hub_wq */ |
|
usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
|
set_bit(port1, hub->change_bits); |
|
} |
|
} |
|
|
|
/* If no port-status-change flags were set, we don't need any |
|
* debouncing. If flags were set we can try to debounce the |
|
* ports all at once right now, instead of letting hub_wq do them |
|
* one at a time later on. |
|
* |
|
* If any port-status changes do occur during this delay, hub_wq |
|
* will see them later and handle them normally. |
|
*/ |
|
if (need_debounce_delay) { |
|
delay = HUB_DEBOUNCE_STABLE; |
|
|
|
/* Don't do a long sleep inside a workqueue routine */ |
|
if (type == HUB_INIT2) { |
|
INIT_DELAYED_WORK(&hub->init_work, hub_init_func3); |
|
queue_delayed_work(system_power_efficient_wq, |
|
&hub->init_work, |
|
msecs_to_jiffies(delay)); |
|
device_unlock(&hdev->dev); |
|
return; /* Continues at init3: below */ |
|
} else { |
|
msleep(delay); |
|
} |
|
} |
|
init3: |
|
hub->quiescing = 0; |
|
|
|
status = usb_submit_urb(hub->urb, GFP_NOIO); |
|
if (status < 0) |
|
dev_err(hub->intfdev, "activate --> %d\n", status); |
|
if (hub->has_indicators && blinkenlights) |
|
queue_delayed_work(system_power_efficient_wq, |
|
&hub->leds, LED_CYCLE_PERIOD); |
|
|
|
/* Scan all ports that need attention */ |
|
kick_hub_wq(hub); |
|
abort: |
|
if (type == HUB_INIT2 || type == HUB_INIT3) { |
|
/* Allow autosuspend if it was suppressed */ |
|
disconnected: |
|
usb_autopm_put_interface_async(to_usb_interface(hub->intfdev)); |
|
device_unlock(&hdev->dev); |
|
} |
|
|
|
kref_put(&hub->kref, hub_release); |
|
} |
|
|
|
/* Implement the continuations for the delays above */ |
|
static void hub_init_func2(struct work_struct *ws) |
|
{ |
|
struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
|
|
|
hub_activate(hub, HUB_INIT2); |
|
} |
|
|
|
static void hub_init_func3(struct work_struct *ws) |
|
{ |
|
struct usb_hub *hub = container_of(ws, struct usb_hub, init_work.work); |
|
|
|
hub_activate(hub, HUB_INIT3); |
|
} |
|
|
|
enum hub_quiescing_type { |
|
HUB_DISCONNECT, HUB_PRE_RESET, HUB_SUSPEND |
|
}; |
|
|
|
static void hub_quiesce(struct usb_hub *hub, enum hub_quiescing_type type) |
|
{ |
|
struct usb_device *hdev = hub->hdev; |
|
unsigned long flags; |
|
int i; |
|
|
|
/* hub_wq and related activity won't re-trigger */ |
|
spin_lock_irqsave(&hub->irq_urb_lock, flags); |
|
hub->quiescing = 1; |
|
spin_unlock_irqrestore(&hub->irq_urb_lock, flags); |
|
|
|
if (type != HUB_SUSPEND) { |
|
/* Disconnect all the children */ |
|
for (i = 0; i < hdev->maxchild; ++i) { |
|
if (hub->ports[i]->child) |
|
usb_disconnect(&hub->ports[i]->child); |
|
} |
|
} |
|
|
|
/* Stop hub_wq and related activity */ |
|
del_timer_sync(&hub->irq_urb_retry); |
|
usb_kill_urb(hub->urb); |
|
if (hub->has_indicators) |
|
cancel_delayed_work_sync(&hub->leds); |
|
if (hub->tt.hub) |
|
flush_work(&hub->tt.clear_work); |
|
} |
|
|
|
static void hub_pm_barrier_for_all_ports(struct usb_hub *hub) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < hub->hdev->maxchild; ++i) |
|
pm_runtime_barrier(&hub->ports[i]->dev); |
|
} |
|
|
|
/* caller has locked the hub device */ |
|
static int hub_pre_reset(struct usb_interface *intf) |
|
{ |
|
struct usb_hub *hub = usb_get_intfdata(intf); |
|
|
|
hub_quiesce(hub, HUB_PRE_RESET); |
|
hub->in_reset = 1; |
|
hub_pm_barrier_for_all_ports(hub); |
|
return 0; |
|
} |
|
|
|
/* caller has locked the hub device */ |
|
static int hub_post_reset(struct usb_interface *intf) |
|
{ |
|
struct usb_hub *hub = usb_get_intfdata(intf); |
|
|
|
hub->in_reset = 0; |
|
hub_pm_barrier_for_all_ports(hub); |
|
hub_activate(hub, HUB_POST_RESET); |
|
return 0; |
|
} |
|
|
|
static int hub_configure(struct usb_hub *hub, |
|
struct usb_endpoint_descriptor *endpoint) |
|
{ |
|
struct usb_hcd *hcd; |
|
struct usb_device *hdev = hub->hdev; |
|
struct device *hub_dev = hub->intfdev; |
|
u16 hubstatus, hubchange; |
|
u16 wHubCharacteristics; |
|
unsigned int pipe; |
|
int maxp, ret, i; |
|
char *message = "out of memory"; |
|
unsigned unit_load; |
|
unsigned full_load; |
|
unsigned maxchild; |
|
|
|
hub->buffer = kmalloc(sizeof(*hub->buffer), GFP_KERNEL); |
|
if (!hub->buffer) { |
|
ret = -ENOMEM; |
|
goto fail; |
|
} |
|
|
|
hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL); |
|
if (!hub->status) { |
|
ret = -ENOMEM; |
|
goto fail; |
|
} |
|
mutex_init(&hub->status_mutex); |
|
|
|
hub->descriptor = kzalloc(sizeof(*hub->descriptor), GFP_KERNEL); |
|
if (!hub->descriptor) { |
|
ret = -ENOMEM; |
|
goto fail; |
|
} |
|
|
|
/* Request the entire hub descriptor. |
|
* hub->descriptor can handle USB_MAXCHILDREN ports, |
|
* but a (non-SS) hub can/will return fewer bytes here. |
|
*/ |
|
ret = get_hub_descriptor(hdev, hub->descriptor); |
|
if (ret < 0) { |
|
message = "can't read hub descriptor"; |
|
goto fail; |
|
} |
|
|
|
maxchild = USB_MAXCHILDREN; |
|
if (hub_is_superspeed(hdev)) |
|
maxchild = min_t(unsigned, maxchild, USB_SS_MAXPORTS); |
|
|
|
if (hub->descriptor->bNbrPorts > maxchild) { |
|
message = "hub has too many ports!"; |
|
ret = -ENODEV; |
|
goto fail; |
|
} else if (hub->descriptor->bNbrPorts == 0) { |
|
message = "hub doesn't have any ports!"; |
|
ret = -ENODEV; |
|
goto fail; |
|
} |
|
|
|
/* |
|
* Accumulate wHubDelay + 40ns for every hub in the tree of devices. |
|
* The resulting value will be used for SetIsochDelay() request. |
|
*/ |
|
if (hub_is_superspeed(hdev) || hub_is_superspeedplus(hdev)) { |
|
u32 delay = __le16_to_cpu(hub->descriptor->u.ss.wHubDelay); |
|
|
|
if (hdev->parent) |
|
delay += hdev->parent->hub_delay; |
|
|
|
delay += USB_TP_TRANSMISSION_DELAY; |
|
hdev->hub_delay = min_t(u32, delay, USB_TP_TRANSMISSION_DELAY_MAX); |
|
} |
|
|
|
maxchild = hub->descriptor->bNbrPorts; |
|
dev_info(hub_dev, "%d port%s detected\n", maxchild, |
|
(maxchild == 1) ? "" : "s"); |
|
|
|
hub->ports = kcalloc(maxchild, sizeof(struct usb_port *), GFP_KERNEL); |
|
if (!hub->ports) { |
|
ret = -ENOMEM; |
|
goto fail; |
|
} |
|
|
|
wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
|
if (hub_is_superspeed(hdev)) { |
|
unit_load = 150; |
|
full_load = 900; |
|
} else { |
|
unit_load = 100; |
|
full_load = 500; |
|
} |
|
|
|
/* FIXME for USB 3.0, skip for now */ |
|
if ((wHubCharacteristics & HUB_CHAR_COMPOUND) && |
|
!(hub_is_superspeed(hdev))) { |
|
char portstr[USB_MAXCHILDREN + 1]; |
|
|
|
for (i = 0; i < maxchild; i++) |
|
portstr[i] = hub->descriptor->u.hs.DeviceRemovable |
|
[((i + 1) / 8)] & (1 << ((i + 1) % 8)) |
|
? 'F' : 'R'; |
|
portstr[maxchild] = 0; |
|
dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr); |
|
} else |
|
dev_dbg(hub_dev, "standalone hub\n"); |
|
|
|
switch (wHubCharacteristics & HUB_CHAR_LPSM) { |
|
case HUB_CHAR_COMMON_LPSM: |
|
dev_dbg(hub_dev, "ganged power switching\n"); |
|
break; |
|
case HUB_CHAR_INDV_PORT_LPSM: |
|
dev_dbg(hub_dev, "individual port power switching\n"); |
|
break; |
|
case HUB_CHAR_NO_LPSM: |
|
case HUB_CHAR_LPSM: |
|
dev_dbg(hub_dev, "no power switching (usb 1.0)\n"); |
|
break; |
|
} |
|
|
|
switch (wHubCharacteristics & HUB_CHAR_OCPM) { |
|
case HUB_CHAR_COMMON_OCPM: |
|
dev_dbg(hub_dev, "global over-current protection\n"); |
|
break; |
|
case HUB_CHAR_INDV_PORT_OCPM: |
|
dev_dbg(hub_dev, "individual port over-current protection\n"); |
|
break; |
|
case HUB_CHAR_NO_OCPM: |
|
case HUB_CHAR_OCPM: |
|
dev_dbg(hub_dev, "no over-current protection\n"); |
|
break; |
|
} |
|
|
|
spin_lock_init(&hub->tt.lock); |
|
INIT_LIST_HEAD(&hub->tt.clear_list); |
|
INIT_WORK(&hub->tt.clear_work, hub_tt_work); |
|
switch (hdev->descriptor.bDeviceProtocol) { |
|
case USB_HUB_PR_FS: |
|
break; |
|
case USB_HUB_PR_HS_SINGLE_TT: |
|
dev_dbg(hub_dev, "Single TT\n"); |
|
hub->tt.hub = hdev; |
|
break; |
|
case USB_HUB_PR_HS_MULTI_TT: |
|
ret = usb_set_interface(hdev, 0, 1); |
|
if (ret == 0) { |
|
dev_dbg(hub_dev, "TT per port\n"); |
|
hub->tt.multi = 1; |
|
} else |
|
dev_err(hub_dev, "Using single TT (err %d)\n", |
|
ret); |
|
hub->tt.hub = hdev; |
|
break; |
|
case USB_HUB_PR_SS: |
|
/* USB 3.0 hubs don't have a TT */ |
|
break; |
|
default: |
|
dev_dbg(hub_dev, "Unrecognized hub protocol %d\n", |
|
hdev->descriptor.bDeviceProtocol); |
|
break; |
|
} |
|
|
|
/* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ |
|
switch (wHubCharacteristics & HUB_CHAR_TTTT) { |
|
case HUB_TTTT_8_BITS: |
|
if (hdev->descriptor.bDeviceProtocol != 0) { |
|
hub->tt.think_time = 666; |
|
dev_dbg(hub_dev, "TT requires at most %d " |
|
"FS bit times (%d ns)\n", |
|
8, hub->tt.think_time); |
|
} |
|
break; |
|
case HUB_TTTT_16_BITS: |
|
hub->tt.think_time = 666 * 2; |
|
dev_dbg(hub_dev, "TT requires at most %d " |
|
"FS bit times (%d ns)\n", |
|
16, hub->tt.think_time); |
|
break; |
|
case HUB_TTTT_24_BITS: |
|
hub->tt.think_time = 666 * 3; |
|
dev_dbg(hub_dev, "TT requires at most %d " |
|
"FS bit times (%d ns)\n", |
|
24, hub->tt.think_time); |
|
break; |
|
case HUB_TTTT_32_BITS: |
|
hub->tt.think_time = 666 * 4; |
|
dev_dbg(hub_dev, "TT requires at most %d " |
|
"FS bit times (%d ns)\n", |
|
32, hub->tt.think_time); |
|
break; |
|
} |
|
|
|
/* probe() zeroes hub->indicator[] */ |
|
if (wHubCharacteristics & HUB_CHAR_PORTIND) { |
|
hub->has_indicators = 1; |
|
dev_dbg(hub_dev, "Port indicators are supported\n"); |
|
} |
|
|
|
dev_dbg(hub_dev, "power on to power good time: %dms\n", |
|
hub->descriptor->bPwrOn2PwrGood * 2); |
|
|
|
/* power budgeting mostly matters with bus-powered hubs, |
|
* and battery-powered root hubs (may provide just 8 mA). |
|
*/ |
|
ret = usb_get_std_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus); |
|
if (ret) { |
|
message = "can't get hub status"; |
|
goto fail; |
|
} |
|
hcd = bus_to_hcd(hdev->bus); |
|
if (hdev == hdev->bus->root_hub) { |
|
if (hcd->power_budget > 0) |
|
hdev->bus_mA = hcd->power_budget; |
|
else |
|
hdev->bus_mA = full_load * maxchild; |
|
if (hdev->bus_mA >= full_load) |
|
hub->mA_per_port = full_load; |
|
else { |
|
hub->mA_per_port = hdev->bus_mA; |
|
hub->limited_power = 1; |
|
} |
|
} else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
|
int remaining = hdev->bus_mA - |
|
hub->descriptor->bHubContrCurrent; |
|
|
|
dev_dbg(hub_dev, "hub controller current requirement: %dmA\n", |
|
hub->descriptor->bHubContrCurrent); |
|
hub->limited_power = 1; |
|
|
|
if (remaining < maxchild * unit_load) |
|
dev_warn(hub_dev, |
|
"insufficient power available " |
|
"to use all downstream ports\n"); |
|
hub->mA_per_port = unit_load; /* 7.2.1 */ |
|
|
|
} else { /* Self-powered external hub */ |
|
/* FIXME: What about battery-powered external hubs that |
|
* provide less current per port? */ |
|
hub->mA_per_port = full_load; |
|
} |
|
if (hub->mA_per_port < full_load) |
|
dev_dbg(hub_dev, "%umA bus power budget for each child\n", |
|
hub->mA_per_port); |
|
|
|
ret = hub_hub_status(hub, &hubstatus, &hubchange); |
|
if (ret < 0) { |
|
message = "can't get hub status"; |
|
goto fail; |
|
} |
|
|
|
/* local power status reports aren't always correct */ |
|
if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER) |
|
dev_dbg(hub_dev, "local power source is %s\n", |
|
(hubstatus & HUB_STATUS_LOCAL_POWER) |
|
? "lost (inactive)" : "good"); |
|
|
|
if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0) |
|
dev_dbg(hub_dev, "%sover-current condition exists\n", |
|
(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); |
|
|
|
/* set up the interrupt endpoint |
|
* We use the EP's maxpacket size instead of (PORTS+1+7)/8 |
|
* bytes as USB2.0[11.12.3] says because some hubs are known |
|
* to send more data (and thus cause overflow). For root hubs, |
|
* maxpktsize is defined in hcd.c's fake endpoint descriptors |
|
* to be big enough for at least USB_MAXCHILDREN ports. */ |
|
pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress); |
|
maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe)); |
|
|
|
if (maxp > sizeof(*hub->buffer)) |
|
maxp = sizeof(*hub->buffer); |
|
|
|
hub->urb = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!hub->urb) { |
|
ret = -ENOMEM; |
|
goto fail; |
|
} |
|
|
|
usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq, |
|
hub, endpoint->bInterval); |
|
|
|
/* maybe cycle the hub leds */ |
|
if (hub->has_indicators && blinkenlights) |
|
hub->indicator[0] = INDICATOR_CYCLE; |
|
|
|
mutex_lock(&usb_port_peer_mutex); |
|
for (i = 0; i < maxchild; i++) { |
|
ret = usb_hub_create_port_device(hub, i + 1); |
|
if (ret < 0) { |
|
dev_err(hub->intfdev, |
|
"couldn't create port%d device.\n", i + 1); |
|
break; |
|
} |
|
} |
|
hdev->maxchild = i; |
|
for (i = 0; i < hdev->maxchild; i++) { |
|
struct usb_port *port_dev = hub->ports[i]; |
|
|
|
pm_runtime_put(&port_dev->dev); |
|
} |
|
|
|
mutex_unlock(&usb_port_peer_mutex); |
|
if (ret < 0) |
|
goto fail; |
|
|
|
/* Update the HCD's internal representation of this hub before hub_wq |
|
* starts getting port status changes for devices under the hub. |
|
*/ |
|
if (hcd->driver->update_hub_device) { |
|
ret = hcd->driver->update_hub_device(hcd, hdev, |
|
&hub->tt, GFP_KERNEL); |
|
if (ret < 0) { |
|
message = "can't update HCD hub info"; |
|
goto fail; |
|
} |
|
} |
|
|
|
usb_hub_adjust_deviceremovable(hdev, hub->descriptor); |
|
|
|
hub_activate(hub, HUB_INIT); |
|
return 0; |
|
|
|
fail: |
|
dev_err(hub_dev, "config failed, %s (err %d)\n", |
|
message, ret); |
|
/* hub_disconnect() frees urb and descriptor */ |
|
return ret; |
|
} |
|
|
|
static void hub_release(struct kref *kref) |
|
{ |
|
struct usb_hub *hub = container_of(kref, struct usb_hub, kref); |
|
|
|
usb_put_dev(hub->hdev); |
|
usb_put_intf(to_usb_interface(hub->intfdev)); |
|
kfree(hub); |
|
} |
|
|
|
static unsigned highspeed_hubs; |
|
|
|
static void hub_disconnect(struct usb_interface *intf) |
|
{ |
|
struct usb_hub *hub = usb_get_intfdata(intf); |
|
struct usb_device *hdev = interface_to_usbdev(intf); |
|
int port1; |
|
|
|
/* |
|
* Stop adding new hub events. We do not want to block here and thus |
|
* will not try to remove any pending work item. |
|
*/ |
|
hub->disconnected = 1; |
|
|
|
/* Disconnect all children and quiesce the hub */ |
|
hub->error = 0; |
|
hub_quiesce(hub, HUB_DISCONNECT); |
|
|
|
mutex_lock(&usb_port_peer_mutex); |
|
|
|
/* Avoid races with recursively_mark_NOTATTACHED() */ |
|
spin_lock_irq(&device_state_lock); |
|
port1 = hdev->maxchild; |
|
hdev->maxchild = 0; |
|
usb_set_intfdata(intf, NULL); |
|
spin_unlock_irq(&device_state_lock); |
|
|
|
for (; port1 > 0; --port1) |
|
usb_hub_remove_port_device(hub, port1); |
|
|
|
mutex_unlock(&usb_port_peer_mutex); |
|
|
|
if (hub->hdev->speed == USB_SPEED_HIGH) |
|
highspeed_hubs--; |
|
|
|
usb_free_urb(hub->urb); |
|
kfree(hub->ports); |
|
kfree(hub->descriptor); |
|
kfree(hub->status); |
|
kfree(hub->buffer); |
|
|
|
pm_suspend_ignore_children(&intf->dev, false); |
|
|
|
if (hub->quirk_disable_autosuspend) |
|
usb_autopm_put_interface(intf); |
|
|
|
kref_put(&hub->kref, hub_release); |
|
} |
|
|
|
static bool hub_descriptor_is_sane(struct usb_host_interface *desc) |
|
{ |
|
/* Some hubs have a subclass of 1, which AFAICT according to the */ |
|
/* specs is not defined, but it works */ |
|
if (desc->desc.bInterfaceSubClass != 0 && |
|
desc->desc.bInterfaceSubClass != 1) |
|
return false; |
|
|
|
/* Multiple endpoints? What kind of mutant ninja-hub is this? */ |
|
if (desc->desc.bNumEndpoints != 1) |
|
return false; |
|
|
|
/* If the first endpoint is not interrupt IN, we'd better punt! */ |
|
if (!usb_endpoint_is_int_in(&desc->endpoint[0].desc)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) |
|
{ |
|
struct usb_host_interface *desc; |
|
struct usb_device *hdev; |
|
struct usb_hub *hub; |
|
|
|
desc = intf->cur_altsetting; |
|
hdev = interface_to_usbdev(intf); |
|
|
|
/* |
|
* Set default autosuspend delay as 0 to speedup bus suspend, |
|
* based on the below considerations: |
|
* |
|
* - Unlike other drivers, the hub driver does not rely on the |
|
* autosuspend delay to provide enough time to handle a wakeup |
|
* event, and the submitted status URB is just to check future |
|
* change on hub downstream ports, so it is safe to do it. |
|
* |
|
* - The patch might cause one or more auto supend/resume for |
|
* below very rare devices when they are plugged into hub |
|
* first time: |
|
* |
|
* devices having trouble initializing, and disconnect |
|
* themselves from the bus and then reconnect a second |
|
* or so later |
|
* |
|
* devices just for downloading firmware, and disconnects |
|
* themselves after completing it |
|
* |
|
* For these quite rare devices, their drivers may change the |
|
* autosuspend delay of their parent hub in the probe() to one |
|
* appropriate value to avoid the subtle problem if someone |
|
* does care it. |
|
* |
|
* - The patch may cause one or more auto suspend/resume on |
|
* hub during running 'lsusb', but it is probably too |
|
* infrequent to worry about. |
|
* |
|
* - Change autosuspend delay of hub can avoid unnecessary auto |
|
* suspend timer for hub, also may decrease power consumption |
|
* of USB bus. |
|
* |
|
* - If user has indicated to prevent autosuspend by passing |
|
* usbcore.autosuspend = -1 then keep autosuspend disabled. |
|
*/ |
|
#ifdef CONFIG_PM |
|
if (hdev->dev.power.autosuspend_delay >= 0) |
|
pm_runtime_set_autosuspend_delay(&hdev->dev, 0); |
|
#endif |
|
|
|
/* |
|
* Hubs have proper suspend/resume support, except for root hubs |
|
* where the controller driver doesn't have bus_suspend and |
|
* bus_resume methods. |
|
*/ |
|
if (hdev->parent) { /* normal device */ |
|
usb_enable_autosuspend(hdev); |
|
} else { /* root hub */ |
|
const struct hc_driver *drv = bus_to_hcd(hdev->bus)->driver; |
|
|
|
if (drv->bus_suspend && drv->bus_resume) |
|
usb_enable_autosuspend(hdev); |
|
} |
|
|
|
if (hdev->level == MAX_TOPO_LEVEL) { |
|
dev_err(&intf->dev, |
|
"Unsupported bus topology: hub nested too deep\n"); |
|
return -E2BIG; |
|
} |
|
|
|
#ifdef CONFIG_USB_OTG_DISABLE_EXTERNAL_HUB |
|
if (hdev->parent) { |
|
dev_warn(&intf->dev, "ignoring external hub\n"); |
|
return -ENODEV; |
|
} |
|
#endif |
|
|
|
if (!hub_descriptor_is_sane(desc)) { |
|
dev_err(&intf->dev, "bad descriptor, ignoring hub\n"); |
|
return -EIO; |
|
} |
|
|
|
/* We found a hub */ |
|
dev_info(&intf->dev, "USB hub found\n"); |
|
|
|
hub = kzalloc(sizeof(*hub), GFP_KERNEL); |
|
if (!hub) |
|
return -ENOMEM; |
|
|
|
kref_init(&hub->kref); |
|
hub->intfdev = &intf->dev; |
|
hub->hdev = hdev; |
|
INIT_DELAYED_WORK(&hub->leds, led_work); |
|
INIT_DELAYED_WORK(&hub->init_work, NULL); |
|
INIT_WORK(&hub->events, hub_event); |
|
spin_lock_init(&hub->irq_urb_lock); |
|
timer_setup(&hub->irq_urb_retry, hub_retry_irq_urb, 0); |
|
usb_get_intf(intf); |
|
usb_get_dev(hdev); |
|
|
|
usb_set_intfdata(intf, hub); |
|
intf->needs_remote_wakeup = 1; |
|
pm_suspend_ignore_children(&intf->dev, true); |
|
|
|
if (hdev->speed == USB_SPEED_HIGH) |
|
highspeed_hubs++; |
|
|
|
if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND) |
|
hub->quirk_check_port_auto_suspend = 1; |
|
|
|
if (id->driver_info & HUB_QUIRK_DISABLE_AUTOSUSPEND) { |
|
hub->quirk_disable_autosuspend = 1; |
|
usb_autopm_get_interface_no_resume(intf); |
|
} |
|
|
|
if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) |
|
return 0; |
|
|
|
hub_disconnect(intf); |
|
return -ENODEV; |
|
} |
|
|
|
static int |
|
hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) |
|
{ |
|
struct usb_device *hdev = interface_to_usbdev(intf); |
|
struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
|
|
|
/* assert ifno == 0 (part of hub spec) */ |
|
switch (code) { |
|
case USBDEVFS_HUB_PORTINFO: { |
|
struct usbdevfs_hub_portinfo *info = user_data; |
|
int i; |
|
|
|
spin_lock_irq(&device_state_lock); |
|
if (hdev->devnum <= 0) |
|
info->nports = 0; |
|
else { |
|
info->nports = hdev->maxchild; |
|
for (i = 0; i < info->nports; i++) { |
|
if (hub->ports[i]->child == NULL) |
|
info->port[i] = 0; |
|
else |
|
info->port[i] = |
|
hub->ports[i]->child->devnum; |
|
} |
|
} |
|
spin_unlock_irq(&device_state_lock); |
|
|
|
return info->nports + 1; |
|
} |
|
|
|
default: |
|
return -ENOSYS; |
|
} |
|
} |
|
|
|
/* |
|
* Allow user programs to claim ports on a hub. When a device is attached |
|
* to one of these "claimed" ports, the program will "own" the device. |
|
*/ |
|
static int find_port_owner(struct usb_device *hdev, unsigned port1, |
|
struct usb_dev_state ***ppowner) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
|
|
|
if (hdev->state == USB_STATE_NOTATTACHED) |
|
return -ENODEV; |
|
if (port1 == 0 || port1 > hdev->maxchild) |
|
return -EINVAL; |
|
|
|
/* Devices not managed by the hub driver |
|
* will always have maxchild equal to 0. |
|
*/ |
|
*ppowner = &(hub->ports[port1 - 1]->port_owner); |
|
return 0; |
|
} |
|
|
|
/* In the following three functions, the caller must hold hdev's lock */ |
|
int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
|
struct usb_dev_state *owner) |
|
{ |
|
int rc; |
|
struct usb_dev_state **powner; |
|
|
|
rc = find_port_owner(hdev, port1, &powner); |
|
if (rc) |
|
return rc; |
|
if (*powner) |
|
return -EBUSY; |
|
*powner = owner; |
|
return rc; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_hub_claim_port); |
|
|
|
int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
|
struct usb_dev_state *owner) |
|
{ |
|
int rc; |
|
struct usb_dev_state **powner; |
|
|
|
rc = find_port_owner(hdev, port1, &powner); |
|
if (rc) |
|
return rc; |
|
if (*powner != owner) |
|
return -ENOENT; |
|
*powner = NULL; |
|
return rc; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_hub_release_port); |
|
|
|
void usb_hub_release_all_ports(struct usb_device *hdev, struct usb_dev_state *owner) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
|
int n; |
|
|
|
for (n = 0; n < hdev->maxchild; n++) { |
|
if (hub->ports[n]->port_owner == owner) |
|
hub->ports[n]->port_owner = NULL; |
|
} |
|
|
|
} |
|
|
|
/* The caller must hold udev's lock */ |
|
bool usb_device_is_owned(struct usb_device *udev) |
|
{ |
|
struct usb_hub *hub; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED || !udev->parent) |
|
return false; |
|
hub = usb_hub_to_struct_hub(udev->parent); |
|
return !!hub->ports[udev->portnum - 1]->port_owner; |
|
} |
|
|
|
static void recursively_mark_NOTATTACHED(struct usb_device *udev) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
|
int i; |
|
|
|
for (i = 0; i < udev->maxchild; ++i) { |
|
if (hub->ports[i]->child) |
|
recursively_mark_NOTATTACHED(hub->ports[i]->child); |
|
} |
|
if (udev->state == USB_STATE_SUSPENDED) |
|
udev->active_duration -= jiffies; |
|
udev->state = USB_STATE_NOTATTACHED; |
|
} |
|
|
|
/** |
|
* usb_set_device_state - change a device's current state (usbcore, hcds) |
|
* @udev: pointer to device whose state should be changed |
|
* @new_state: new state value to be stored |
|
* |
|
* udev->state is _not_ fully protected by the device lock. Although |
|
* most transitions are made only while holding the lock, the state can |
|
* can change to USB_STATE_NOTATTACHED at almost any time. This |
|
* is so that devices can be marked as disconnected as soon as possible, |
|
* without having to wait for any semaphores to be released. As a result, |
|
* all changes to any device's state must be protected by the |
|
* device_state_lock spinlock. |
|
* |
|
* Once a device has been added to the device tree, all changes to its state |
|
* should be made using this routine. The state should _not_ be set directly. |
|
* |
|
* If udev->state is already USB_STATE_NOTATTACHED then no change is made. |
|
* Otherwise udev->state is set to new_state, and if new_state is |
|
* USB_STATE_NOTATTACHED then all of udev's descendants' states are also set |
|
* to USB_STATE_NOTATTACHED. |
|
*/ |
|
void usb_set_device_state(struct usb_device *udev, |
|
enum usb_device_state new_state) |
|
{ |
|
unsigned long flags; |
|
int wakeup = -1; |
|
|
|
spin_lock_irqsave(&device_state_lock, flags); |
|
if (udev->state == USB_STATE_NOTATTACHED) |
|
; /* do nothing */ |
|
else if (new_state != USB_STATE_NOTATTACHED) { |
|
|
|
/* root hub wakeup capabilities are managed out-of-band |
|
* and may involve silicon errata ... ignore them here. |
|
*/ |
|
if (udev->parent) { |
|
if (udev->state == USB_STATE_SUSPENDED |
|
|| new_state == USB_STATE_SUSPENDED) |
|
; /* No change to wakeup settings */ |
|
else if (new_state == USB_STATE_CONFIGURED) |
|
wakeup = (udev->quirks & |
|
USB_QUIRK_IGNORE_REMOTE_WAKEUP) ? 0 : |
|
udev->actconfig->desc.bmAttributes & |
|
USB_CONFIG_ATT_WAKEUP; |
|
else |
|
wakeup = 0; |
|
} |
|
if (udev->state == USB_STATE_SUSPENDED && |
|
new_state != USB_STATE_SUSPENDED) |
|
udev->active_duration -= jiffies; |
|
else if (new_state == USB_STATE_SUSPENDED && |
|
udev->state != USB_STATE_SUSPENDED) |
|
udev->active_duration += jiffies; |
|
udev->state = new_state; |
|
} else |
|
recursively_mark_NOTATTACHED(udev); |
|
spin_unlock_irqrestore(&device_state_lock, flags); |
|
if (wakeup >= 0) |
|
device_set_wakeup_capable(&udev->dev, wakeup); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_set_device_state); |
|
|
|
/* |
|
* Choose a device number. |
|
* |
|
* Device numbers are used as filenames in usbfs. On USB-1.1 and |
|
* USB-2.0 buses they are also used as device addresses, however on |
|
* USB-3.0 buses the address is assigned by the controller hardware |
|
* and it usually is not the same as the device number. |
|
* |
|
* WUSB devices are simple: they have no hubs behind, so the mapping |
|
* device <-> virtual port number becomes 1:1. Why? to simplify the |
|
* life of the device connection logic in |
|
* drivers/usb/wusbcore/devconnect.c. When we do the initial secret |
|
* handshake we need to assign a temporary address in the unauthorized |
|
* space. For simplicity we use the first virtual port number found to |
|
* be free [drivers/usb/wusbcore/devconnect.c:wusbhc_devconnect_ack()] |
|
* and that becomes it's address [X < 128] or its unauthorized address |
|
* [X | 0x80]. |
|
* |
|
* We add 1 as an offset to the one-based USB-stack port number |
|
* (zero-based wusb virtual port index) for two reasons: (a) dev addr |
|
* 0 is reserved by USB for default address; (b) Linux's USB stack |
|
* uses always #1 for the root hub of the controller. So USB stack's |
|
* port #1, which is wusb virtual-port #0 has address #2. |
|
* |
|
* Devices connected under xHCI are not as simple. The host controller |
|
* supports virtualization, so the hardware assigns device addresses and |
|
* the HCD must setup data structures before issuing a set address |
|
* command to the hardware. |
|
*/ |
|
static void choose_devnum(struct usb_device *udev) |
|
{ |
|
int devnum; |
|
struct usb_bus *bus = udev->bus; |
|
|
|
/* be safe when more hub events are proceed in parallel */ |
|
mutex_lock(&bus->devnum_next_mutex); |
|
if (udev->wusb) { |
|
devnum = udev->portnum + 1; |
|
BUG_ON(test_bit(devnum, bus->devmap.devicemap)); |
|
} else { |
|
/* Try to allocate the next devnum beginning at |
|
* bus->devnum_next. */ |
|
devnum = find_next_zero_bit(bus->devmap.devicemap, 128, |
|
bus->devnum_next); |
|
if (devnum >= 128) |
|
devnum = find_next_zero_bit(bus->devmap.devicemap, |
|
128, 1); |
|
bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1); |
|
} |
|
if (devnum < 128) { |
|
set_bit(devnum, bus->devmap.devicemap); |
|
udev->devnum = devnum; |
|
} |
|
mutex_unlock(&bus->devnum_next_mutex); |
|
} |
|
|
|
static void release_devnum(struct usb_device *udev) |
|
{ |
|
if (udev->devnum > 0) { |
|
clear_bit(udev->devnum, udev->bus->devmap.devicemap); |
|
udev->devnum = -1; |
|
} |
|
} |
|
|
|
static void update_devnum(struct usb_device *udev, int devnum) |
|
{ |
|
/* The address for a WUSB device is managed by wusbcore. */ |
|
if (!udev->wusb) |
|
udev->devnum = devnum; |
|
if (!udev->devaddr) |
|
udev->devaddr = (u8)devnum; |
|
} |
|
|
|
static void hub_free_dev(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
/* Root hubs aren't real devices, so don't free HCD resources */ |
|
if (hcd->driver->free_dev && udev->parent) |
|
hcd->driver->free_dev(hcd, udev); |
|
} |
|
|
|
static void hub_disconnect_children(struct usb_device *udev) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
|
int i; |
|
|
|
/* Free up all the children before we remove this device */ |
|
for (i = 0; i < udev->maxchild; i++) { |
|
if (hub->ports[i]->child) |
|
usb_disconnect(&hub->ports[i]->child); |
|
} |
|
} |
|
|
|
/** |
|
* usb_disconnect - disconnect a device (usbcore-internal) |
|
* @pdev: pointer to device being disconnected |
|
* |
|
* Context: task context, might sleep |
|
* |
|
* Something got disconnected. Get rid of it and all of its children. |
|
* |
|
* If *pdev is a normal device then the parent hub must already be locked. |
|
* If *pdev is a root hub then the caller must hold the usb_bus_idr_lock, |
|
* which protects the set of root hubs as well as the list of buses. |
|
* |
|
* Only hub drivers (including virtual root hub drivers for host |
|
* controllers) should ever call this. |
|
* |
|
* This call is synchronous, and may not be used in an interrupt context. |
|
*/ |
|
void usb_disconnect(struct usb_device **pdev) |
|
{ |
|
struct usb_port *port_dev = NULL; |
|
struct usb_device *udev = *pdev; |
|
struct usb_hub *hub = NULL; |
|
int port1 = 1; |
|
|
|
/* mark the device as inactive, so any further urb submissions for |
|
* this device (and any of its children) will fail immediately. |
|
* this quiesces everything except pending urbs. |
|
*/ |
|
usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
|
dev_info(&udev->dev, "USB disconnect, device number %d\n", |
|
udev->devnum); |
|
|
|
/* |
|
* Ensure that the pm runtime code knows that the USB device |
|
* is in the process of being disconnected. |
|
*/ |
|
pm_runtime_barrier(&udev->dev); |
|
|
|
usb_lock_device(udev); |
|
|
|
hub_disconnect_children(udev); |
|
|
|
/* deallocate hcd/hardware state ... nuking all pending urbs and |
|
* cleaning up all state associated with the current configuration |
|
* so that the hardware is now fully quiesced. |
|
*/ |
|
dev_dbg(&udev->dev, "unregistering device\n"); |
|
usb_disable_device(udev, 0); |
|
usb_hcd_synchronize_unlinks(udev); |
|
|
|
if (udev->parent) { |
|
port1 = udev->portnum; |
|
hub = usb_hub_to_struct_hub(udev->parent); |
|
port_dev = hub->ports[port1 - 1]; |
|
|
|
sysfs_remove_link(&udev->dev.kobj, "port"); |
|
sysfs_remove_link(&port_dev->dev.kobj, "device"); |
|
|
|
/* |
|
* As usb_port_runtime_resume() de-references udev, make |
|
* sure no resumes occur during removal |
|
*/ |
|
if (!test_and_set_bit(port1, hub->child_usage_bits)) |
|
pm_runtime_get_sync(&port_dev->dev); |
|
} |
|
|
|
usb_remove_ep_devs(&udev->ep0); |
|
usb_unlock_device(udev); |
|
|
|
/* Unregister the device. The device driver is responsible |
|
* for de-configuring the device and invoking the remove-device |
|
* notifier chain (used by usbfs and possibly others). |
|
*/ |
|
device_del(&udev->dev); |
|
|
|
/* Free the device number and delete the parent's children[] |
|
* (or root_hub) pointer. |
|
*/ |
|
release_devnum(udev); |
|
|
|
/* Avoid races with recursively_mark_NOTATTACHED() */ |
|
spin_lock_irq(&device_state_lock); |
|
*pdev = NULL; |
|
spin_unlock_irq(&device_state_lock); |
|
|
|
if (port_dev && test_and_clear_bit(port1, hub->child_usage_bits)) |
|
pm_runtime_put(&port_dev->dev); |
|
|
|
hub_free_dev(udev); |
|
|
|
put_device(&udev->dev); |
|
} |
|
|
|
#ifdef CONFIG_USB_ANNOUNCE_NEW_DEVICES |
|
static void show_string(struct usb_device *udev, char *id, char *string) |
|
{ |
|
if (!string) |
|
return; |
|
dev_info(&udev->dev, "%s: %s\n", id, string); |
|
} |
|
|
|
static void announce_device(struct usb_device *udev) |
|
{ |
|
u16 bcdDevice = le16_to_cpu(udev->descriptor.bcdDevice); |
|
|
|
dev_info(&udev->dev, |
|
"New USB device found, idVendor=%04x, idProduct=%04x, bcdDevice=%2x.%02x\n", |
|
le16_to_cpu(udev->descriptor.idVendor), |
|
le16_to_cpu(udev->descriptor.idProduct), |
|
bcdDevice >> 8, bcdDevice & 0xff); |
|
dev_info(&udev->dev, |
|
"New USB device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", |
|
udev->descriptor.iManufacturer, |
|
udev->descriptor.iProduct, |
|
udev->descriptor.iSerialNumber); |
|
show_string(udev, "Product", udev->product); |
|
show_string(udev, "Manufacturer", udev->manufacturer); |
|
show_string(udev, "SerialNumber", udev->serial); |
|
} |
|
#else |
|
static inline void announce_device(struct usb_device *udev) { } |
|
#endif |
|
|
|
|
|
/** |
|
* usb_enumerate_device_otg - FIXME (usbcore-internal) |
|
* @udev: newly addressed device (in ADDRESS state) |
|
* |
|
* Finish enumeration for On-The-Go devices |
|
* |
|
* Return: 0 if successful. A negative error code otherwise. |
|
*/ |
|
static int usb_enumerate_device_otg(struct usb_device *udev) |
|
{ |
|
int err = 0; |
|
|
|
#ifdef CONFIG_USB_OTG |
|
/* |
|
* OTG-aware devices on OTG-capable root hubs may be able to use SRP, |
|
* to wake us after we've powered off VBUS; and HNP, switching roles |
|
* "host" to "peripheral". The OTG descriptor helps figure this out. |
|
*/ |
|
if (!udev->bus->is_b_host |
|
&& udev->config |
|
&& udev->parent == udev->bus->root_hub) { |
|
struct usb_otg_descriptor *desc = NULL; |
|
struct usb_bus *bus = udev->bus; |
|
unsigned port1 = udev->portnum; |
|
|
|
/* descriptor may appear anywhere in config */ |
|
err = __usb_get_extra_descriptor(udev->rawdescriptors[0], |
|
le16_to_cpu(udev->config[0].desc.wTotalLength), |
|
USB_DT_OTG, (void **) &desc, sizeof(*desc)); |
|
if (err || !(desc->bmAttributes & USB_OTG_HNP)) |
|
return 0; |
|
|
|
dev_info(&udev->dev, "Dual-Role OTG device on %sHNP port\n", |
|
(port1 == bus->otg_port) ? "" : "non-"); |
|
|
|
/* enable HNP before suspend, it's simpler */ |
|
if (port1 == bus->otg_port) { |
|
bus->b_hnp_enable = 1; |
|
err = usb_control_msg(udev, |
|
usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_FEATURE, 0, |
|
USB_DEVICE_B_HNP_ENABLE, |
|
0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
if (err < 0) { |
|
/* |
|
* OTG MESSAGE: report errors here, |
|
* customize to match your product. |
|
*/ |
|
dev_err(&udev->dev, "can't set HNP mode: %d\n", |
|
err); |
|
bus->b_hnp_enable = 0; |
|
} |
|
} else if (desc->bLength == sizeof |
|
(struct usb_otg_descriptor)) { |
|
/* Set a_alt_hnp_support for legacy otg device */ |
|
err = usb_control_msg(udev, |
|
usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_FEATURE, 0, |
|
USB_DEVICE_A_ALT_HNP_SUPPORT, |
|
0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
if (err < 0) |
|
dev_err(&udev->dev, |
|
"set a_alt_hnp_support failed: %d\n", |
|
err); |
|
} |
|
} |
|
#endif |
|
return err; |
|
} |
|
|
|
|
|
/** |
|
* usb_enumerate_device - Read device configs/intfs/otg (usbcore-internal) |
|
* @udev: newly addressed device (in ADDRESS state) |
|
* |
|
* This is only called by usb_new_device() and usb_authorize_device() |
|
* and FIXME -- all comments that apply to them apply here wrt to |
|
* environment. |
|
* |
|
* If the device is WUSB and not authorized, we don't attempt to read |
|
* the string descriptors, as they will be errored out by the device |
|
* until it has been authorized. |
|
* |
|
* Return: 0 if successful. A negative error code otherwise. |
|
*/ |
|
static int usb_enumerate_device(struct usb_device *udev) |
|
{ |
|
int err; |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
if (udev->config == NULL) { |
|
err = usb_get_configuration(udev); |
|
if (err < 0) { |
|
if (err != -ENODEV) |
|
dev_err(&udev->dev, "can't read configurations, error %d\n", |
|
err); |
|
return err; |
|
} |
|
} |
|
|
|
/* read the standard strings and cache them if present */ |
|
udev->product = usb_cache_string(udev, udev->descriptor.iProduct); |
|
udev->manufacturer = usb_cache_string(udev, |
|
udev->descriptor.iManufacturer); |
|
udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber); |
|
|
|
err = usb_enumerate_device_otg(udev); |
|
if (err < 0) |
|
return err; |
|
|
|
if (IS_ENABLED(CONFIG_USB_OTG_PRODUCTLIST) && hcd->tpl_support && |
|
!is_targeted(udev)) { |
|
/* Maybe it can talk to us, though we can't talk to it. |
|
* (Includes HNP test device.) |
|
*/ |
|
if (IS_ENABLED(CONFIG_USB_OTG) && (udev->bus->b_hnp_enable |
|
|| udev->bus->is_b_host)) { |
|
err = usb_port_suspend(udev, PMSG_AUTO_SUSPEND); |
|
if (err < 0) |
|
dev_dbg(&udev->dev, "HNP fail, %d\n", err); |
|
} |
|
return -ENOTSUPP; |
|
} |
|
|
|
usb_detect_interface_quirks(udev); |
|
|
|
return 0; |
|
} |
|
|
|
static void set_usb_port_removable(struct usb_device *udev) |
|
{ |
|
struct usb_device *hdev = udev->parent; |
|
struct usb_hub *hub; |
|
u8 port = udev->portnum; |
|
u16 wHubCharacteristics; |
|
bool removable = true; |
|
|
|
if (!hdev) |
|
return; |
|
|
|
hub = usb_hub_to_struct_hub(udev->parent); |
|
|
|
/* |
|
* If the platform firmware has provided information about a port, |
|
* use that to determine whether it's removable. |
|
*/ |
|
switch (hub->ports[udev->portnum - 1]->connect_type) { |
|
case USB_PORT_CONNECT_TYPE_HOT_PLUG: |
|
udev->removable = USB_DEVICE_REMOVABLE; |
|
return; |
|
case USB_PORT_CONNECT_TYPE_HARD_WIRED: |
|
case USB_PORT_NOT_USED: |
|
udev->removable = USB_DEVICE_FIXED; |
|
return; |
|
default: |
|
break; |
|
} |
|
|
|
/* |
|
* Otherwise, check whether the hub knows whether a port is removable |
|
* or not |
|
*/ |
|
wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics); |
|
|
|
if (!(wHubCharacteristics & HUB_CHAR_COMPOUND)) |
|
return; |
|
|
|
if (hub_is_superspeed(hdev)) { |
|
if (le16_to_cpu(hub->descriptor->u.ss.DeviceRemovable) |
|
& (1 << port)) |
|
removable = false; |
|
} else { |
|
if (hub->descriptor->u.hs.DeviceRemovable[port / 8] & (1 << (port % 8))) |
|
removable = false; |
|
} |
|
|
|
if (removable) |
|
udev->removable = USB_DEVICE_REMOVABLE; |
|
else |
|
udev->removable = USB_DEVICE_FIXED; |
|
|
|
} |
|
|
|
/** |
|
* usb_new_device - perform initial device setup (usbcore-internal) |
|
* @udev: newly addressed device (in ADDRESS state) |
|
* |
|
* This is called with devices which have been detected but not fully |
|
* enumerated. The device descriptor is available, but not descriptors |
|
* for any device configuration. The caller must have locked either |
|
* the parent hub (if udev is a normal device) or else the |
|
* usb_bus_idr_lock (if udev is a root hub). The parent's pointer to |
|
* udev has already been installed, but udev is not yet visible through |
|
* sysfs or other filesystem code. |
|
* |
|
* This call is synchronous, and may not be used in an interrupt context. |
|
* |
|
* Only the hub driver or root-hub registrar should ever call this. |
|
* |
|
* Return: Whether the device is configured properly or not. Zero if the |
|
* interface was registered with the driver core; else a negative errno |
|
* value. |
|
* |
|
*/ |
|
int usb_new_device(struct usb_device *udev) |
|
{ |
|
int err; |
|
|
|
if (udev->parent) { |
|
/* Initialize non-root-hub device wakeup to disabled; |
|
* device (un)configuration controls wakeup capable |
|
* sysfs power/wakeup controls wakeup enabled/disabled |
|
*/ |
|
device_init_wakeup(&udev->dev, 0); |
|
} |
|
|
|
/* Tell the runtime-PM framework the device is active */ |
|
pm_runtime_set_active(&udev->dev); |
|
pm_runtime_get_noresume(&udev->dev); |
|
pm_runtime_use_autosuspend(&udev->dev); |
|
pm_runtime_enable(&udev->dev); |
|
|
|
/* By default, forbid autosuspend for all devices. It will be |
|
* allowed for hubs during binding. |
|
*/ |
|
usb_disable_autosuspend(udev); |
|
|
|
err = usb_enumerate_device(udev); /* Read descriptors */ |
|
if (err < 0) |
|
goto fail; |
|
dev_dbg(&udev->dev, "udev %d, busnum %d, minor = %d\n", |
|
udev->devnum, udev->bus->busnum, |
|
(((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
|
/* export the usbdev device-node for libusb */ |
|
udev->dev.devt = MKDEV(USB_DEVICE_MAJOR, |
|
(((udev->bus->busnum-1) * 128) + (udev->devnum-1))); |
|
|
|
/* Tell the world! */ |
|
announce_device(udev); |
|
|
|
if (udev->serial) |
|
add_device_randomness(udev->serial, strlen(udev->serial)); |
|
if (udev->product) |
|
add_device_randomness(udev->product, strlen(udev->product)); |
|
if (udev->manufacturer) |
|
add_device_randomness(udev->manufacturer, |
|
strlen(udev->manufacturer)); |
|
|
|
device_enable_async_suspend(&udev->dev); |
|
|
|
/* check whether the hub or firmware marks this port as non-removable */ |
|
if (udev->parent) |
|
set_usb_port_removable(udev); |
|
|
|
/* Register the device. The device driver is responsible |
|
* for configuring the device and invoking the add-device |
|
* notifier chain (used by usbfs and possibly others). |
|
*/ |
|
err = device_add(&udev->dev); |
|
if (err) { |
|
dev_err(&udev->dev, "can't device_add, error %d\n", err); |
|
goto fail; |
|
} |
|
|
|
/* Create link files between child device and usb port device. */ |
|
if (udev->parent) { |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
|
int port1 = udev->portnum; |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
|
|
err = sysfs_create_link(&udev->dev.kobj, |
|
&port_dev->dev.kobj, "port"); |
|
if (err) |
|
goto fail; |
|
|
|
err = sysfs_create_link(&port_dev->dev.kobj, |
|
&udev->dev.kobj, "device"); |
|
if (err) { |
|
sysfs_remove_link(&udev->dev.kobj, "port"); |
|
goto fail; |
|
} |
|
|
|
if (!test_and_set_bit(port1, hub->child_usage_bits)) |
|
pm_runtime_get_sync(&port_dev->dev); |
|
} |
|
|
|
(void) usb_create_ep_devs(&udev->dev, &udev->ep0, udev); |
|
usb_mark_last_busy(udev); |
|
pm_runtime_put_sync_autosuspend(&udev->dev); |
|
return err; |
|
|
|
fail: |
|
usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
|
pm_runtime_disable(&udev->dev); |
|
pm_runtime_set_suspended(&udev->dev); |
|
return err; |
|
} |
|
|
|
|
|
/** |
|
* usb_deauthorize_device - deauthorize a device (usbcore-internal) |
|
* @usb_dev: USB device |
|
* |
|
* Move the USB device to a very basic state where interfaces are disabled |
|
* and the device is in fact unconfigured and unusable. |
|
* |
|
* We share a lock (that we have) with device_del(), so we need to |
|
* defer its call. |
|
* |
|
* Return: 0. |
|
*/ |
|
int usb_deauthorize_device(struct usb_device *usb_dev) |
|
{ |
|
usb_lock_device(usb_dev); |
|
if (usb_dev->authorized == 0) |
|
goto out_unauthorized; |
|
|
|
usb_dev->authorized = 0; |
|
usb_set_configuration(usb_dev, -1); |
|
|
|
out_unauthorized: |
|
usb_unlock_device(usb_dev); |
|
return 0; |
|
} |
|
|
|
|
|
int usb_authorize_device(struct usb_device *usb_dev) |
|
{ |
|
int result = 0, c; |
|
|
|
usb_lock_device(usb_dev); |
|
if (usb_dev->authorized == 1) |
|
goto out_authorized; |
|
|
|
result = usb_autoresume_device(usb_dev); |
|
if (result < 0) { |
|
dev_err(&usb_dev->dev, |
|
"can't autoresume for authorization: %d\n", result); |
|
goto error_autoresume; |
|
} |
|
|
|
if (usb_dev->wusb) { |
|
result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor)); |
|
if (result < 0) { |
|
dev_err(&usb_dev->dev, "can't re-read device descriptor for " |
|
"authorization: %d\n", result); |
|
goto error_device_descriptor; |
|
} |
|
} |
|
|
|
usb_dev->authorized = 1; |
|
/* Choose and set the configuration. This registers the interfaces |
|
* with the driver core and lets interface drivers bind to them. |
|
*/ |
|
c = usb_choose_configuration(usb_dev); |
|
if (c >= 0) { |
|
result = usb_set_configuration(usb_dev, c); |
|
if (result) { |
|
dev_err(&usb_dev->dev, |
|
"can't set config #%d, error %d\n", c, result); |
|
/* This need not be fatal. The user can try to |
|
* set other configurations. */ |
|
} |
|
} |
|
dev_info(&usb_dev->dev, "authorized to connect\n"); |
|
|
|
error_device_descriptor: |
|
usb_autosuspend_device(usb_dev); |
|
error_autoresume: |
|
out_authorized: |
|
usb_unlock_device(usb_dev); /* complements locktree */ |
|
return result; |
|
} |
|
|
|
/* |
|
* Return 1 if port speed is SuperSpeedPlus, 0 otherwise |
|
* check it from the link protocol field of the current speed ID attribute. |
|
* current speed ID is got from ext port status request. Sublink speed attribute |
|
* table is returned with the hub BOS SSP device capability descriptor |
|
*/ |
|
static int port_speed_is_ssp(struct usb_device *hdev, int speed_id) |
|
{ |
|
int ssa_count; |
|
u32 ss_attr; |
|
int i; |
|
struct usb_ssp_cap_descriptor *ssp_cap = hdev->bos->ssp_cap; |
|
|
|
if (!ssp_cap) |
|
return 0; |
|
|
|
ssa_count = le32_to_cpu(ssp_cap->bmAttributes) & |
|
USB_SSP_SUBLINK_SPEED_ATTRIBS; |
|
|
|
for (i = 0; i <= ssa_count; i++) { |
|
ss_attr = le32_to_cpu(ssp_cap->bmSublinkSpeedAttr[i]); |
|
if (speed_id == (ss_attr & USB_SSP_SUBLINK_SPEED_SSID)) |
|
return !!(ss_attr & USB_SSP_SUBLINK_SPEED_LP); |
|
} |
|
return 0; |
|
} |
|
|
|
/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */ |
|
static unsigned hub_is_wusb(struct usb_hub *hub) |
|
{ |
|
struct usb_hcd *hcd; |
|
if (hub->hdev->parent != NULL) /* not a root hub? */ |
|
return 0; |
|
hcd = bus_to_hcd(hub->hdev->bus); |
|
return hcd->wireless; |
|
} |
|
|
|
|
|
#ifdef CONFIG_USB_FEW_INIT_RETRIES |
|
#define PORT_RESET_TRIES 2 |
|
#define SET_ADDRESS_TRIES 1 |
|
#define GET_DESCRIPTOR_TRIES 1 |
|
#define GET_MAXPACKET0_TRIES 1 |
|
#define PORT_INIT_TRIES 4 |
|
|
|
#else |
|
#define PORT_RESET_TRIES 5 |
|
#define SET_ADDRESS_TRIES 2 |
|
#define GET_DESCRIPTOR_TRIES 2 |
|
#define GET_MAXPACKET0_TRIES 3 |
|
#define PORT_INIT_TRIES 4 |
|
#endif /* CONFIG_USB_FEW_INIT_RETRIES */ |
|
|
|
#define HUB_ROOT_RESET_TIME 60 /* times are in msec */ |
|
#define HUB_SHORT_RESET_TIME 10 |
|
#define HUB_BH_RESET_TIME 50 |
|
#define HUB_LONG_RESET_TIME 200 |
|
#define HUB_RESET_TIMEOUT 800 |
|
|
|
static bool use_new_scheme(struct usb_device *udev, int retry, |
|
struct usb_port *port_dev) |
|
{ |
|
int old_scheme_first_port = |
|
(port_dev->quirks & USB_PORT_QUIRK_OLD_SCHEME) || |
|
old_scheme_first; |
|
|
|
/* |
|
* "New scheme" enumeration causes an extra state transition to be |
|
* exposed to an xhci host and causes USB3 devices to receive control |
|
* commands in the default state. This has been seen to cause |
|
* enumeration failures, so disable this enumeration scheme for USB3 |
|
* devices. |
|
*/ |
|
if (udev->speed >= USB_SPEED_SUPER) |
|
return false; |
|
|
|
/* |
|
* If use_both_schemes is set, use the first scheme (whichever |
|
* it is) for the larger half of the retries, then use the other |
|
* scheme. Otherwise, use the first scheme for all the retries. |
|
*/ |
|
if (use_both_schemes && retry >= (PORT_INIT_TRIES + 1) / 2) |
|
return old_scheme_first_port; /* Second half */ |
|
return !old_scheme_first_port; /* First half or all */ |
|
} |
|
|
|
/* Is a USB 3.0 port in the Inactive or Compliance Mode state? |
|
* Port warm reset is required to recover |
|
*/ |
|
static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, |
|
u16 portstatus) |
|
{ |
|
u16 link_state; |
|
|
|
if (!hub_is_superspeed(hub->hdev)) |
|
return false; |
|
|
|
if (test_bit(port1, hub->warm_reset_bits)) |
|
return true; |
|
|
|
link_state = portstatus & USB_PORT_STAT_LINK_STATE; |
|
return link_state == USB_SS_PORT_LS_SS_INACTIVE |
|
|| link_state == USB_SS_PORT_LS_COMP_MOD; |
|
} |
|
|
|
static int hub_port_wait_reset(struct usb_hub *hub, int port1, |
|
struct usb_device *udev, unsigned int delay, bool warm) |
|
{ |
|
int delay_time, ret; |
|
u16 portstatus; |
|
u16 portchange; |
|
u32 ext_portstatus = 0; |
|
|
|
for (delay_time = 0; |
|
delay_time < HUB_RESET_TIMEOUT; |
|
delay_time += delay) { |
|
/* wait to give the device a chance to reset */ |
|
msleep(delay); |
|
|
|
/* read and decode port status */ |
|
if (hub_is_superspeedplus(hub->hdev)) |
|
ret = hub_ext_port_status(hub, port1, |
|
HUB_EXT_PORT_STATUS, |
|
&portstatus, &portchange, |
|
&ext_portstatus); |
|
else |
|
ret = hub_port_status(hub, port1, &portstatus, |
|
&portchange); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* |
|
* The port state is unknown until the reset completes. |
|
* |
|
* On top of that, some chips may require additional time |
|
* to re-establish a connection after the reset is complete, |
|
* so also wait for the connection to be re-established. |
|
*/ |
|
if (!(portstatus & USB_PORT_STAT_RESET) && |
|
(portstatus & USB_PORT_STAT_CONNECTION)) |
|
break; |
|
|
|
/* switch to the long delay after two short delay failures */ |
|
if (delay_time >= 2 * HUB_SHORT_RESET_TIME) |
|
delay = HUB_LONG_RESET_TIME; |
|
|
|
dev_dbg(&hub->ports[port1 - 1]->dev, |
|
"not %sreset yet, waiting %dms\n", |
|
warm ? "warm " : "", delay); |
|
} |
|
|
|
if ((portstatus & USB_PORT_STAT_RESET)) |
|
return -EBUSY; |
|
|
|
if (hub_port_warm_reset_required(hub, port1, portstatus)) |
|
return -ENOTCONN; |
|
|
|
/* Device went away? */ |
|
if (!(portstatus & USB_PORT_STAT_CONNECTION)) |
|
return -ENOTCONN; |
|
|
|
/* Retry if connect change is set but status is still connected. |
|
* A USB 3.0 connection may bounce if multiple warm resets were issued, |
|
* but the device may have successfully re-connected. Ignore it. |
|
*/ |
|
if (!hub_is_superspeed(hub->hdev) && |
|
(portchange & USB_PORT_STAT_C_CONNECTION)) { |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_CONNECTION); |
|
return -EAGAIN; |
|
} |
|
|
|
if (!(portstatus & USB_PORT_STAT_ENABLE)) |
|
return -EBUSY; |
|
|
|
if (!udev) |
|
return 0; |
|
|
|
if (hub_is_superspeedplus(hub->hdev)) { |
|
/* extended portstatus Rx and Tx lane count are zero based */ |
|
udev->rx_lanes = USB_EXT_PORT_RX_LANES(ext_portstatus) + 1; |
|
udev->tx_lanes = USB_EXT_PORT_TX_LANES(ext_portstatus) + 1; |
|
} else { |
|
udev->rx_lanes = 1; |
|
udev->tx_lanes = 1; |
|
} |
|
if (hub_is_wusb(hub)) |
|
udev->speed = USB_SPEED_WIRELESS; |
|
else if (hub_is_superspeedplus(hub->hdev) && |
|
port_speed_is_ssp(hub->hdev, ext_portstatus & |
|
USB_EXT_PORT_STAT_RX_SPEED_ID)) |
|
udev->speed = USB_SPEED_SUPER_PLUS; |
|
else if (hub_is_superspeed(hub->hdev)) |
|
udev->speed = USB_SPEED_SUPER; |
|
else if (portstatus & USB_PORT_STAT_HIGH_SPEED) |
|
udev->speed = USB_SPEED_HIGH; |
|
else if (portstatus & USB_PORT_STAT_LOW_SPEED) |
|
udev->speed = USB_SPEED_LOW; |
|
else |
|
udev->speed = USB_SPEED_FULL; |
|
return 0; |
|
} |
|
|
|
/* Handle port reset and port warm(BH) reset (for USB3 protocol ports) */ |
|
static int hub_port_reset(struct usb_hub *hub, int port1, |
|
struct usb_device *udev, unsigned int delay, bool warm) |
|
{ |
|
int i, status; |
|
u16 portchange, portstatus; |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
int reset_recovery_time; |
|
|
|
if (!hub_is_superspeed(hub->hdev)) { |
|
if (warm) { |
|
dev_err(hub->intfdev, "only USB3 hub support " |
|
"warm reset\n"); |
|
return -EINVAL; |
|
} |
|
/* Block EHCI CF initialization during the port reset. |
|
* Some companion controllers don't like it when they mix. |
|
*/ |
|
down_read(&ehci_cf_port_reset_rwsem); |
|
} else if (!warm) { |
|
/* |
|
* If the caller hasn't explicitly requested a warm reset, |
|
* double check and see if one is needed. |
|
*/ |
|
if (hub_port_status(hub, port1, &portstatus, &portchange) == 0) |
|
if (hub_port_warm_reset_required(hub, port1, |
|
portstatus)) |
|
warm = true; |
|
} |
|
clear_bit(port1, hub->warm_reset_bits); |
|
|
|
/* Reset the port */ |
|
for (i = 0; i < PORT_RESET_TRIES; i++) { |
|
status = set_port_feature(hub->hdev, port1, (warm ? |
|
USB_PORT_FEAT_BH_PORT_RESET : |
|
USB_PORT_FEAT_RESET)); |
|
if (status == -ENODEV) { |
|
; /* The hub is gone */ |
|
} else if (status) { |
|
dev_err(&port_dev->dev, |
|
"cannot %sreset (err = %d)\n", |
|
warm ? "warm " : "", status); |
|
} else { |
|
status = hub_port_wait_reset(hub, port1, udev, delay, |
|
warm); |
|
if (status && status != -ENOTCONN && status != -ENODEV) |
|
dev_dbg(hub->intfdev, |
|
"port_wait_reset: err = %d\n", |
|
status); |
|
} |
|
|
|
/* Check for disconnect or reset */ |
|
if (status == 0 || status == -ENOTCONN || status == -ENODEV) { |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_RESET); |
|
|
|
if (!hub_is_superspeed(hub->hdev)) |
|
goto done; |
|
|
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_BH_PORT_RESET); |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_PORT_LINK_STATE); |
|
|
|
if (udev) |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_CONNECTION); |
|
|
|
/* |
|
* If a USB 3.0 device migrates from reset to an error |
|
* state, re-issue the warm reset. |
|
*/ |
|
if (hub_port_status(hub, port1, |
|
&portstatus, &portchange) < 0) |
|
goto done; |
|
|
|
if (!hub_port_warm_reset_required(hub, port1, |
|
portstatus)) |
|
goto done; |
|
|
|
/* |
|
* If the port is in SS.Inactive or Compliance Mode, the |
|
* hot or warm reset failed. Try another warm reset. |
|
*/ |
|
if (!warm) { |
|
dev_dbg(&port_dev->dev, |
|
"hot reset failed, warm reset\n"); |
|
warm = true; |
|
} |
|
} |
|
|
|
dev_dbg(&port_dev->dev, |
|
"not enabled, trying %sreset again...\n", |
|
warm ? "warm " : ""); |
|
delay = HUB_LONG_RESET_TIME; |
|
} |
|
|
|
dev_err(&port_dev->dev, "Cannot enable. Maybe the USB cable is bad?\n"); |
|
|
|
done: |
|
if (status == 0) { |
|
if (port_dev->quirks & USB_PORT_QUIRK_FAST_ENUM) |
|
usleep_range(10000, 12000); |
|
else { |
|
/* TRSTRCY = 10 ms; plus some extra */ |
|
reset_recovery_time = 10 + 40; |
|
|
|
/* Hub needs extra delay after resetting its port. */ |
|
if (hub->hdev->quirks & USB_QUIRK_HUB_SLOW_RESET) |
|
reset_recovery_time += 100; |
|
|
|
msleep(reset_recovery_time); |
|
} |
|
|
|
if (udev) { |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
update_devnum(udev, 0); |
|
/* The xHC may think the device is already reset, |
|
* so ignore the status. |
|
*/ |
|
if (hcd->driver->reset_device) |
|
hcd->driver->reset_device(hcd, udev); |
|
|
|
usb_set_device_state(udev, USB_STATE_DEFAULT); |
|
} |
|
} else { |
|
if (udev) |
|
usb_set_device_state(udev, USB_STATE_NOTATTACHED); |
|
} |
|
|
|
if (!hub_is_superspeed(hub->hdev)) |
|
up_read(&ehci_cf_port_reset_rwsem); |
|
|
|
return status; |
|
} |
|
|
|
/* Check if a port is power on */ |
|
static int port_is_power_on(struct usb_hub *hub, unsigned portstatus) |
|
{ |
|
int ret = 0; |
|
|
|
if (hub_is_superspeed(hub->hdev)) { |
|
if (portstatus & USB_SS_PORT_STAT_POWER) |
|
ret = 1; |
|
} else { |
|
if (portstatus & USB_PORT_STAT_POWER) |
|
ret = 1; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void usb_lock_port(struct usb_port *port_dev) |
|
__acquires(&port_dev->status_lock) |
|
{ |
|
mutex_lock(&port_dev->status_lock); |
|
__acquire(&port_dev->status_lock); |
|
} |
|
|
|
static void usb_unlock_port(struct usb_port *port_dev) |
|
__releases(&port_dev->status_lock) |
|
{ |
|
mutex_unlock(&port_dev->status_lock); |
|
__release(&port_dev->status_lock); |
|
} |
|
|
|
#ifdef CONFIG_PM |
|
|
|
/* Check if a port is suspended(USB2.0 port) or in U3 state(USB3.0 port) */ |
|
static int port_is_suspended(struct usb_hub *hub, unsigned portstatus) |
|
{ |
|
int ret = 0; |
|
|
|
if (hub_is_superspeed(hub->hdev)) { |
|
if ((portstatus & USB_PORT_STAT_LINK_STATE) |
|
== USB_SS_PORT_LS_U3) |
|
ret = 1; |
|
} else { |
|
if (portstatus & USB_PORT_STAT_SUSPEND) |
|
ret = 1; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
/* Determine whether the device on a port is ready for a normal resume, |
|
* is ready for a reset-resume, or should be disconnected. |
|
*/ |
|
static int check_port_resume_type(struct usb_device *udev, |
|
struct usb_hub *hub, int port1, |
|
int status, u16 portchange, u16 portstatus) |
|
{ |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
int retries = 3; |
|
|
|
retry: |
|
/* Is a warm reset needed to recover the connection? */ |
|
if (status == 0 && udev->reset_resume |
|
&& hub_port_warm_reset_required(hub, port1, portstatus)) { |
|
/* pass */; |
|
} |
|
/* Is the device still present? */ |
|
else if (status || port_is_suspended(hub, portstatus) || |
|
!port_is_power_on(hub, portstatus)) { |
|
if (status >= 0) |
|
status = -ENODEV; |
|
} else if (!(portstatus & USB_PORT_STAT_CONNECTION)) { |
|
if (retries--) { |
|
usleep_range(200, 300); |
|
status = hub_port_status(hub, port1, &portstatus, |
|
&portchange); |
|
goto retry; |
|
} |
|
status = -ENODEV; |
|
} |
|
|
|
/* Can't do a normal resume if the port isn't enabled, |
|
* so try a reset-resume instead. |
|
*/ |
|
else if (!(portstatus & USB_PORT_STAT_ENABLE) && !udev->reset_resume) { |
|
if (udev->persist_enabled) |
|
udev->reset_resume = 1; |
|
else |
|
status = -ENODEV; |
|
} |
|
|
|
if (status) { |
|
dev_dbg(&port_dev->dev, "status %04x.%04x after resume, %d\n", |
|
portchange, portstatus, status); |
|
} else if (udev->reset_resume) { |
|
|
|
/* Late port handoff can set status-change bits */ |
|
if (portchange & USB_PORT_STAT_C_CONNECTION) |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_CONNECTION); |
|
if (portchange & USB_PORT_STAT_C_ENABLE) |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_ENABLE); |
|
|
|
/* |
|
* Whatever made this reset-resume necessary may have |
|
* turned on the port1 bit in hub->change_bits. But after |
|
* a successful reset-resume we want the bit to be clear; |
|
* if it was on it would indicate that something happened |
|
* following the reset-resume. |
|
*/ |
|
clear_bit(port1, hub->change_bits); |
|
} |
|
|
|
return status; |
|
} |
|
|
|
int usb_disable_ltm(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
/* Check if the roothub and device supports LTM. */ |
|
if (!usb_device_supports_ltm(hcd->self.root_hub) || |
|
!usb_device_supports_ltm(udev)) |
|
return 0; |
|
|
|
/* Clear Feature LTM Enable can only be sent if the device is |
|
* configured. |
|
*/ |
|
if (!udev->actconfig) |
|
return 0; |
|
|
|
return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
|
USB_DEVICE_LTM_ENABLE, 0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_disable_ltm); |
|
|
|
void usb_enable_ltm(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
/* Check if the roothub and device supports LTM. */ |
|
if (!usb_device_supports_ltm(hcd->self.root_hub) || |
|
!usb_device_supports_ltm(udev)) |
|
return; |
|
|
|
/* Set Feature LTM Enable can only be sent if the device is |
|
* configured. |
|
*/ |
|
if (!udev->actconfig) |
|
return; |
|
|
|
usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
|
USB_DEVICE_LTM_ENABLE, 0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_enable_ltm); |
|
|
|
/* |
|
* usb_enable_remote_wakeup - enable remote wakeup for a device |
|
* @udev: target device |
|
* |
|
* For USB-2 devices: Set the device's remote wakeup feature. |
|
* |
|
* For USB-3 devices: Assume there's only one function on the device and |
|
* enable remote wake for the first interface. FIXME if the interface |
|
* association descriptor shows there's more than one function. |
|
*/ |
|
static int usb_enable_remote_wakeup(struct usb_device *udev) |
|
{ |
|
if (udev->speed < USB_SPEED_SUPER) |
|
return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_FEATURE, USB_RECIP_DEVICE, |
|
USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
else |
|
return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, |
|
USB_INTRF_FUNC_SUSPEND, |
|
USB_INTRF_FUNC_SUSPEND_RW | |
|
USB_INTRF_FUNC_SUSPEND_LP, |
|
NULL, 0, USB_CTRL_SET_TIMEOUT); |
|
} |
|
|
|
/* |
|
* usb_disable_remote_wakeup - disable remote wakeup for a device |
|
* @udev: target device |
|
* |
|
* For USB-2 devices: Clear the device's remote wakeup feature. |
|
* |
|
* For USB-3 devices: Assume there's only one function on the device and |
|
* disable remote wake for the first interface. FIXME if the interface |
|
* association descriptor shows there's more than one function. |
|
*/ |
|
static int usb_disable_remote_wakeup(struct usb_device *udev) |
|
{ |
|
if (udev->speed < USB_SPEED_SUPER) |
|
return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, |
|
USB_DEVICE_REMOTE_WAKEUP, 0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
else |
|
return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_FEATURE, USB_RECIP_INTERFACE, |
|
USB_INTRF_FUNC_SUSPEND, 0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
} |
|
|
|
/* Count of wakeup-enabled devices at or below udev */ |
|
unsigned usb_wakeup_enabled_descendants(struct usb_device *udev) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev); |
|
|
|
return udev->do_remote_wakeup + |
|
(hub ? hub->wakeup_enabled_descendants : 0); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_wakeup_enabled_descendants); |
|
|
|
/* |
|
* usb_port_suspend - suspend a usb device's upstream port |
|
* @udev: device that's no longer in active use, not a root hub |
|
* Context: must be able to sleep; device not locked; pm locks held |
|
* |
|
* Suspends a USB device that isn't in active use, conserving power. |
|
* Devices may wake out of a suspend, if anything important happens, |
|
* using the remote wakeup mechanism. They may also be taken out of |
|
* suspend by the host, using usb_port_resume(). It's also routine |
|
* to disconnect devices while they are suspended. |
|
* |
|
* This only affects the USB hardware for a device; its interfaces |
|
* (and, for hubs, child devices) must already have been suspended. |
|
* |
|
* Selective port suspend reduces power; most suspended devices draw |
|
* less than 500 uA. It's also used in OTG, along with remote wakeup. |
|
* All devices below the suspended port are also suspended. |
|
* |
|
* Devices leave suspend state when the host wakes them up. Some devices |
|
* also support "remote wakeup", where the device can activate the USB |
|
* tree above them to deliver data, such as a keypress or packet. In |
|
* some cases, this wakes the USB host. |
|
* |
|
* Suspending OTG devices may trigger HNP, if that's been enabled |
|
* between a pair of dual-role devices. That will change roles, such |
|
* as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. |
|
* |
|
* Devices on USB hub ports have only one "suspend" state, corresponding |
|
* to ACPI D2, "may cause the device to lose some context". |
|
* State transitions include: |
|
* |
|
* - suspend, resume ... when the VBUS power link stays live |
|
* - suspend, disconnect ... VBUS lost |
|
* |
|
* Once VBUS drop breaks the circuit, the port it's using has to go through |
|
* normal re-enumeration procedures, starting with enabling VBUS power. |
|
* Other than re-initializing the hub (plug/unplug, except for root hubs), |
|
* Linux (2.6) currently has NO mechanisms to initiate that: no hub_wq |
|
* timer, no SRP, no requests through sysfs. |
|
* |
|
* If Runtime PM isn't enabled or used, non-SuperSpeed devices may not get |
|
* suspended until their bus goes into global suspend (i.e., the root |
|
* hub is suspended). Nevertheless, we change @udev->state to |
|
* USB_STATE_SUSPENDED as this is the device's "logical" state. The actual |
|
* upstream port setting is stored in @udev->port_is_suspended. |
|
* |
|
* Returns 0 on success, else negative errno. |
|
*/ |
|
int usb_port_suspend(struct usb_device *udev, pm_message_t msg) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
|
struct usb_port *port_dev = hub->ports[udev->portnum - 1]; |
|
int port1 = udev->portnum; |
|
int status; |
|
bool really_suspend = true; |
|
|
|
usb_lock_port(port_dev); |
|
|
|
/* enable remote wakeup when appropriate; this lets the device |
|
* wake up the upstream hub (including maybe the root hub). |
|
* |
|
* NOTE: OTG devices may issue remote wakeup (or SRP) even when |
|
* we don't explicitly enable it here. |
|
*/ |
|
if (udev->do_remote_wakeup) { |
|
status = usb_enable_remote_wakeup(udev); |
|
if (status) { |
|
dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", |
|
status); |
|
/* bail if autosuspend is requested */ |
|
if (PMSG_IS_AUTO(msg)) |
|
goto err_wakeup; |
|
} |
|
} |
|
|
|
/* disable USB2 hardware LPM */ |
|
usb_disable_usb2_hardware_lpm(udev); |
|
|
|
if (usb_disable_ltm(udev)) { |
|
dev_err(&udev->dev, "Failed to disable LTM before suspend\n"); |
|
status = -ENOMEM; |
|
if (PMSG_IS_AUTO(msg)) |
|
goto err_ltm; |
|
} |
|
|
|
/* see 7.1.7.6 */ |
|
if (hub_is_superspeed(hub->hdev)) |
|
status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U3); |
|
|
|
/* |
|
* For system suspend, we do not need to enable the suspend feature |
|
* on individual USB-2 ports. The devices will automatically go |
|
* into suspend a few ms after the root hub stops sending packets. |
|
* The USB 2.0 spec calls this "global suspend". |
|
* |
|
* However, many USB hubs have a bug: They don't relay wakeup requests |
|
* from a downstream port if the port's suspend feature isn't on. |
|
* Therefore we will turn on the suspend feature if udev or any of its |
|
* descendants is enabled for remote wakeup. |
|
*/ |
|
else if (PMSG_IS_AUTO(msg) || usb_wakeup_enabled_descendants(udev) > 0) |
|
status = set_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_SUSPEND); |
|
else { |
|
really_suspend = false; |
|
status = 0; |
|
} |
|
if (status) { |
|
dev_dbg(&port_dev->dev, "can't suspend, status %d\n", status); |
|
|
|
/* Try to enable USB3 LTM again */ |
|
usb_enable_ltm(udev); |
|
err_ltm: |
|
/* Try to enable USB2 hardware LPM again */ |
|
usb_enable_usb2_hardware_lpm(udev); |
|
|
|
if (udev->do_remote_wakeup) |
|
(void) usb_disable_remote_wakeup(udev); |
|
err_wakeup: |
|
|
|
/* System sleep transitions should never fail */ |
|
if (!PMSG_IS_AUTO(msg)) |
|
status = 0; |
|
} else { |
|
dev_dbg(&udev->dev, "usb %ssuspend, wakeup %d\n", |
|
(PMSG_IS_AUTO(msg) ? "auto-" : ""), |
|
udev->do_remote_wakeup); |
|
if (really_suspend) { |
|
udev->port_is_suspended = 1; |
|
|
|
/* device has up to 10 msec to fully suspend */ |
|
msleep(10); |
|
} |
|
usb_set_device_state(udev, USB_STATE_SUSPENDED); |
|
} |
|
|
|
if (status == 0 && !udev->do_remote_wakeup && udev->persist_enabled |
|
&& test_and_clear_bit(port1, hub->child_usage_bits)) |
|
pm_runtime_put_sync(&port_dev->dev); |
|
|
|
usb_mark_last_busy(hub->hdev); |
|
|
|
usb_unlock_port(port_dev); |
|
return status; |
|
} |
|
|
|
/* |
|
* If the USB "suspend" state is in use (rather than "global suspend"), |
|
* many devices will be individually taken out of suspend state using |
|
* special "resume" signaling. This routine kicks in shortly after |
|
* hardware resume signaling is finished, either because of selective |
|
* resume (by host) or remote wakeup (by device) ... now see what changed |
|
* in the tree that's rooted at this device. |
|
* |
|
* If @udev->reset_resume is set then the device is reset before the |
|
* status check is done. |
|
*/ |
|
static int finish_port_resume(struct usb_device *udev) |
|
{ |
|
int status = 0; |
|
u16 devstatus = 0; |
|
|
|
/* caller owns the udev device lock */ |
|
dev_dbg(&udev->dev, "%s\n", |
|
udev->reset_resume ? "finish reset-resume" : "finish resume"); |
|
|
|
/* usb ch9 identifies four variants of SUSPENDED, based on what |
|
* state the device resumes to. Linux currently won't see the |
|
* first two on the host side; they'd be inside hub_port_init() |
|
* during many timeouts, but hub_wq can't suspend until later. |
|
*/ |
|
usb_set_device_state(udev, udev->actconfig |
|
? USB_STATE_CONFIGURED |
|
: USB_STATE_ADDRESS); |
|
|
|
/* 10.5.4.5 says not to reset a suspended port if the attached |
|
* device is enabled for remote wakeup. Hence the reset |
|
* operation is carried out here, after the port has been |
|
* resumed. |
|
*/ |
|
if (udev->reset_resume) { |
|
/* |
|
* If the device morphs or switches modes when it is reset, |
|
* we don't want to perform a reset-resume. We'll fail the |
|
* resume, which will cause a logical disconnect, and then |
|
* the device will be rediscovered. |
|
*/ |
|
retry_reset_resume: |
|
if (udev->quirks & USB_QUIRK_RESET) |
|
status = -ENODEV; |
|
else |
|
status = usb_reset_and_verify_device(udev); |
|
} |
|
|
|
/* 10.5.4.5 says be sure devices in the tree are still there. |
|
* For now let's assume the device didn't go crazy on resume, |
|
* and device drivers will know about any resume quirks. |
|
*/ |
|
if (status == 0) { |
|
devstatus = 0; |
|
status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, &devstatus); |
|
|
|
/* If a normal resume failed, try doing a reset-resume */ |
|
if (status && !udev->reset_resume && udev->persist_enabled) { |
|
dev_dbg(&udev->dev, "retry with reset-resume\n"); |
|
udev->reset_resume = 1; |
|
goto retry_reset_resume; |
|
} |
|
} |
|
|
|
if (status) { |
|
dev_dbg(&udev->dev, "gone after usb resume? status %d\n", |
|
status); |
|
/* |
|
* There are a few quirky devices which violate the standard |
|
* by claiming to have remote wakeup enabled after a reset, |
|
* which crash if the feature is cleared, hence check for |
|
* udev->reset_resume |
|
*/ |
|
} else if (udev->actconfig && !udev->reset_resume) { |
|
if (udev->speed < USB_SPEED_SUPER) { |
|
if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) |
|
status = usb_disable_remote_wakeup(udev); |
|
} else { |
|
status = usb_get_std_status(udev, USB_RECIP_INTERFACE, 0, |
|
&devstatus); |
|
if (!status && devstatus & (USB_INTRF_STAT_FUNC_RW_CAP |
|
| USB_INTRF_STAT_FUNC_RW)) |
|
status = usb_disable_remote_wakeup(udev); |
|
} |
|
|
|
if (status) |
|
dev_dbg(&udev->dev, |
|
"disable remote wakeup, status %d\n", |
|
status); |
|
status = 0; |
|
} |
|
return status; |
|
} |
|
|
|
/* |
|
* There are some SS USB devices which take longer time for link training. |
|
* XHCI specs 4.19.4 says that when Link training is successful, port |
|
* sets CCS bit to 1. So if SW reads port status before successful link |
|
* training, then it will not find device to be present. |
|
* USB Analyzer log with such buggy devices show that in some cases |
|
* device switch on the RX termination after long delay of host enabling |
|
* the VBUS. In few other cases it has been seen that device fails to |
|
* negotiate link training in first attempt. It has been |
|
* reported till now that few devices take as long as 2000 ms to train |
|
* the link after host enabling its VBUS and termination. Following |
|
* routine implements a 2000 ms timeout for link training. If in a case |
|
* link trains before timeout, loop will exit earlier. |
|
* |
|
* There are also some 2.0 hard drive based devices and 3.0 thumb |
|
* drives that, when plugged into a 2.0 only port, take a long |
|
* time to set CCS after VBUS enable. |
|
* |
|
* FIXME: If a device was connected before suspend, but was removed |
|
* while system was asleep, then the loop in the following routine will |
|
* only exit at timeout. |
|
* |
|
* This routine should only be called when persist is enabled. |
|
*/ |
|
static int wait_for_connected(struct usb_device *udev, |
|
struct usb_hub *hub, int *port1, |
|
u16 *portchange, u16 *portstatus) |
|
{ |
|
int status = 0, delay_ms = 0; |
|
|
|
while (delay_ms < 2000) { |
|
if (status || *portstatus & USB_PORT_STAT_CONNECTION) |
|
break; |
|
if (!port_is_power_on(hub, *portstatus)) { |
|
status = -ENODEV; |
|
break; |
|
} |
|
msleep(20); |
|
delay_ms += 20; |
|
status = hub_port_status(hub, *port1, portstatus, portchange); |
|
} |
|
dev_dbg(&udev->dev, "Waited %dms for CONNECT\n", delay_ms); |
|
return status; |
|
} |
|
|
|
/* |
|
* usb_port_resume - re-activate a suspended usb device's upstream port |
|
* @udev: device to re-activate, not a root hub |
|
* Context: must be able to sleep; device not locked; pm locks held |
|
* |
|
* This will re-activate the suspended device, increasing power usage |
|
* while letting drivers communicate again with its endpoints. |
|
* USB resume explicitly guarantees that the power session between |
|
* the host and the device is the same as it was when the device |
|
* suspended. |
|
* |
|
* If @udev->reset_resume is set then this routine won't check that the |
|
* port is still enabled. Furthermore, finish_port_resume() above will |
|
* reset @udev. The end result is that a broken power session can be |
|
* recovered and @udev will appear to persist across a loss of VBUS power. |
|
* |
|
* For example, if a host controller doesn't maintain VBUS suspend current |
|
* during a system sleep or is reset when the system wakes up, all the USB |
|
* power sessions below it will be broken. This is especially troublesome |
|
* for mass-storage devices containing mounted filesystems, since the |
|
* device will appear to have disconnected and all the memory mappings |
|
* to it will be lost. Using the USB_PERSIST facility, the device can be |
|
* made to appear as if it had not disconnected. |
|
* |
|
* This facility can be dangerous. Although usb_reset_and_verify_device() makes |
|
* every effort to insure that the same device is present after the |
|
* reset as before, it cannot provide a 100% guarantee. Furthermore it's |
|
* quite possible for a device to remain unaltered but its media to be |
|
* changed. If the user replaces a flash memory card while the system is |
|
* asleep, he will have only himself to blame when the filesystem on the |
|
* new card is corrupted and the system crashes. |
|
* |
|
* Returns 0 on success, else negative errno. |
|
*/ |
|
int usb_port_resume(struct usb_device *udev, pm_message_t msg) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
|
struct usb_port *port_dev = hub->ports[udev->portnum - 1]; |
|
int port1 = udev->portnum; |
|
int status; |
|
u16 portchange, portstatus; |
|
|
|
if (!test_and_set_bit(port1, hub->child_usage_bits)) { |
|
status = pm_runtime_resume_and_get(&port_dev->dev); |
|
if (status < 0) { |
|
dev_dbg(&udev->dev, "can't resume usb port, status %d\n", |
|
status); |
|
return status; |
|
} |
|
} |
|
|
|
usb_lock_port(port_dev); |
|
|
|
/* Skip the initial Clear-Suspend step for a remote wakeup */ |
|
status = hub_port_status(hub, port1, &portstatus, &portchange); |
|
if (status == 0 && !port_is_suspended(hub, portstatus)) { |
|
if (portchange & USB_PORT_STAT_C_SUSPEND) |
|
pm_wakeup_event(&udev->dev, 0); |
|
goto SuspendCleared; |
|
} |
|
|
|
/* see 7.1.7.7; affects power usage, but not budgeting */ |
|
if (hub_is_superspeed(hub->hdev)) |
|
status = hub_set_port_link_state(hub, port1, USB_SS_PORT_LS_U0); |
|
else |
|
status = usb_clear_port_feature(hub->hdev, |
|
port1, USB_PORT_FEAT_SUSPEND); |
|
if (status) { |
|
dev_dbg(&port_dev->dev, "can't resume, status %d\n", status); |
|
} else { |
|
/* drive resume for USB_RESUME_TIMEOUT msec */ |
|
dev_dbg(&udev->dev, "usb %sresume\n", |
|
(PMSG_IS_AUTO(msg) ? "auto-" : "")); |
|
msleep(USB_RESUME_TIMEOUT); |
|
|
|
/* Virtual root hubs can trigger on GET_PORT_STATUS to |
|
* stop resume signaling. Then finish the resume |
|
* sequence. |
|
*/ |
|
status = hub_port_status(hub, port1, &portstatus, &portchange); |
|
} |
|
|
|
SuspendCleared: |
|
if (status == 0) { |
|
udev->port_is_suspended = 0; |
|
if (hub_is_superspeed(hub->hdev)) { |
|
if (portchange & USB_PORT_STAT_C_LINK_STATE) |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_PORT_LINK_STATE); |
|
} else { |
|
if (portchange & USB_PORT_STAT_C_SUSPEND) |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_SUSPEND); |
|
} |
|
|
|
/* TRSMRCY = 10 msec */ |
|
msleep(10); |
|
} |
|
|
|
if (udev->persist_enabled) |
|
status = wait_for_connected(udev, hub, &port1, &portchange, |
|
&portstatus); |
|
|
|
status = check_port_resume_type(udev, |
|
hub, port1, status, portchange, portstatus); |
|
if (status == 0) |
|
status = finish_port_resume(udev); |
|
if (status < 0) { |
|
dev_dbg(&udev->dev, "can't resume, status %d\n", status); |
|
hub_port_logical_disconnect(hub, port1); |
|
} else { |
|
/* Try to enable USB2 hardware LPM */ |
|
usb_enable_usb2_hardware_lpm(udev); |
|
|
|
/* Try to enable USB3 LTM */ |
|
usb_enable_ltm(udev); |
|
} |
|
|
|
usb_unlock_port(port_dev); |
|
|
|
return status; |
|
} |
|
|
|
int usb_remote_wakeup(struct usb_device *udev) |
|
{ |
|
int status = 0; |
|
|
|
usb_lock_device(udev); |
|
if (udev->state == USB_STATE_SUSPENDED) { |
|
dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-"); |
|
status = usb_autoresume_device(udev); |
|
if (status == 0) { |
|
/* Let the drivers do their thing, then... */ |
|
usb_autosuspend_device(udev); |
|
} |
|
} |
|
usb_unlock_device(udev); |
|
return status; |
|
} |
|
|
|
/* Returns 1 if there was a remote wakeup and a connect status change. */ |
|
static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
|
u16 portstatus, u16 portchange) |
|
__must_hold(&port_dev->status_lock) |
|
{ |
|
struct usb_port *port_dev = hub->ports[port - 1]; |
|
struct usb_device *hdev; |
|
struct usb_device *udev; |
|
int connect_change = 0; |
|
u16 link_state; |
|
int ret; |
|
|
|
hdev = hub->hdev; |
|
udev = port_dev->child; |
|
if (!hub_is_superspeed(hdev)) { |
|
if (!(portchange & USB_PORT_STAT_C_SUSPEND)) |
|
return 0; |
|
usb_clear_port_feature(hdev, port, USB_PORT_FEAT_C_SUSPEND); |
|
} else { |
|
link_state = portstatus & USB_PORT_STAT_LINK_STATE; |
|
if (!udev || udev->state != USB_STATE_SUSPENDED || |
|
(link_state != USB_SS_PORT_LS_U0 && |
|
link_state != USB_SS_PORT_LS_U1 && |
|
link_state != USB_SS_PORT_LS_U2)) |
|
return 0; |
|
} |
|
|
|
if (udev) { |
|
/* TRSMRCY = 10 msec */ |
|
msleep(10); |
|
|
|
usb_unlock_port(port_dev); |
|
ret = usb_remote_wakeup(udev); |
|
usb_lock_port(port_dev); |
|
if (ret < 0) |
|
connect_change = 1; |
|
} else { |
|
ret = -ENODEV; |
|
hub_port_disable(hub, port, 1); |
|
} |
|
dev_dbg(&port_dev->dev, "resume, status %d\n", ret); |
|
return connect_change; |
|
} |
|
|
|
static int check_ports_changed(struct usb_hub *hub) |
|
{ |
|
int port1; |
|
|
|
for (port1 = 1; port1 <= hub->hdev->maxchild; ++port1) { |
|
u16 portstatus, portchange; |
|
int status; |
|
|
|
status = hub_port_status(hub, port1, &portstatus, &portchange); |
|
if (!status && portchange) |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
static int hub_suspend(struct usb_interface *intf, pm_message_t msg) |
|
{ |
|
struct usb_hub *hub = usb_get_intfdata(intf); |
|
struct usb_device *hdev = hub->hdev; |
|
unsigned port1; |
|
|
|
/* |
|
* Warn if children aren't already suspended. |
|
* Also, add up the number of wakeup-enabled descendants. |
|
*/ |
|
hub->wakeup_enabled_descendants = 0; |
|
for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
struct usb_device *udev = port_dev->child; |
|
|
|
if (udev && udev->can_submit) { |
|
dev_warn(&port_dev->dev, "device %s not suspended yet\n", |
|
dev_name(&udev->dev)); |
|
if (PMSG_IS_AUTO(msg)) |
|
return -EBUSY; |
|
} |
|
if (udev) |
|
hub->wakeup_enabled_descendants += |
|
usb_wakeup_enabled_descendants(udev); |
|
} |
|
|
|
if (hdev->do_remote_wakeup && hub->quirk_check_port_auto_suspend) { |
|
/* check if there are changes pending on hub ports */ |
|
if (check_ports_changed(hub)) { |
|
if (PMSG_IS_AUTO(msg)) |
|
return -EBUSY; |
|
pm_wakeup_event(&hdev->dev, 2000); |
|
} |
|
} |
|
|
|
if (hub_is_superspeed(hdev) && hdev->do_remote_wakeup) { |
|
/* Enable hub to send remote wakeup for all ports. */ |
|
for (port1 = 1; port1 <= hdev->maxchild; port1++) { |
|
set_port_feature(hdev, |
|
port1 | |
|
USB_PORT_FEAT_REMOTE_WAKE_CONNECT | |
|
USB_PORT_FEAT_REMOTE_WAKE_DISCONNECT | |
|
USB_PORT_FEAT_REMOTE_WAKE_OVER_CURRENT, |
|
USB_PORT_FEAT_REMOTE_WAKE_MASK); |
|
} |
|
} |
|
|
|
dev_dbg(&intf->dev, "%s\n", __func__); |
|
|
|
/* stop hub_wq and related activity */ |
|
hub_quiesce(hub, HUB_SUSPEND); |
|
return 0; |
|
} |
|
|
|
/* Report wakeup requests from the ports of a resuming root hub */ |
|
static void report_wakeup_requests(struct usb_hub *hub) |
|
{ |
|
struct usb_device *hdev = hub->hdev; |
|
struct usb_device *udev; |
|
struct usb_hcd *hcd; |
|
unsigned long resuming_ports; |
|
int i; |
|
|
|
if (hdev->parent) |
|
return; /* Not a root hub */ |
|
|
|
hcd = bus_to_hcd(hdev->bus); |
|
if (hcd->driver->get_resuming_ports) { |
|
|
|
/* |
|
* The get_resuming_ports() method returns a bitmap (origin 0) |
|
* of ports which have started wakeup signaling but have not |
|
* yet finished resuming. During system resume we will |
|
* resume all the enabled ports, regardless of any wakeup |
|
* signals, which means the wakeup requests would be lost. |
|
* To prevent this, report them to the PM core here. |
|
*/ |
|
resuming_ports = hcd->driver->get_resuming_ports(hcd); |
|
for (i = 0; i < hdev->maxchild; ++i) { |
|
if (test_bit(i, &resuming_ports)) { |
|
udev = hub->ports[i]->child; |
|
if (udev) |
|
pm_wakeup_event(&udev->dev, 0); |
|
} |
|
} |
|
} |
|
} |
|
|
|
static int hub_resume(struct usb_interface *intf) |
|
{ |
|
struct usb_hub *hub = usb_get_intfdata(intf); |
|
|
|
dev_dbg(&intf->dev, "%s\n", __func__); |
|
hub_activate(hub, HUB_RESUME); |
|
|
|
/* |
|
* This should be called only for system resume, not runtime resume. |
|
* We can't tell the difference here, so some wakeup requests will be |
|
* reported at the wrong time or more than once. This shouldn't |
|
* matter much, so long as they do get reported. |
|
*/ |
|
report_wakeup_requests(hub); |
|
return 0; |
|
} |
|
|
|
static int hub_reset_resume(struct usb_interface *intf) |
|
{ |
|
struct usb_hub *hub = usb_get_intfdata(intf); |
|
|
|
dev_dbg(&intf->dev, "%s\n", __func__); |
|
hub_activate(hub, HUB_RESET_RESUME); |
|
return 0; |
|
} |
|
|
|
/** |
|
* usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power |
|
* @rhdev: struct usb_device for the root hub |
|
* |
|
* The USB host controller driver calls this function when its root hub |
|
* is resumed and Vbus power has been interrupted or the controller |
|
* has been reset. The routine marks @rhdev as having lost power. |
|
* When the hub driver is resumed it will take notice and carry out |
|
* power-session recovery for all the "USB-PERSIST"-enabled child devices; |
|
* the others will be disconnected. |
|
*/ |
|
void usb_root_hub_lost_power(struct usb_device *rhdev) |
|
{ |
|
dev_notice(&rhdev->dev, "root hub lost power or was reset\n"); |
|
rhdev->reset_resume = 1; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); |
|
|
|
static const char * const usb3_lpm_names[] = { |
|
"U0", |
|
"U1", |
|
"U2", |
|
"U3", |
|
}; |
|
|
|
/* |
|
* Send a Set SEL control transfer to the device, prior to enabling |
|
* device-initiated U1 or U2. This lets the device know the exit latencies from |
|
* the time the device initiates a U1 or U2 exit, to the time it will receive a |
|
* packet from the host. |
|
* |
|
* This function will fail if the SEL or PEL values for udev are greater than |
|
* the maximum allowed values for the link state to be enabled. |
|
*/ |
|
static int usb_req_set_sel(struct usb_device *udev, enum usb3_link_state state) |
|
{ |
|
struct usb_set_sel_req *sel_values; |
|
unsigned long long u1_sel; |
|
unsigned long long u1_pel; |
|
unsigned long long u2_sel; |
|
unsigned long long u2_pel; |
|
int ret; |
|
|
|
if (udev->state != USB_STATE_CONFIGURED) |
|
return 0; |
|
|
|
/* Convert SEL and PEL stored in ns to us */ |
|
u1_sel = DIV_ROUND_UP(udev->u1_params.sel, 1000); |
|
u1_pel = DIV_ROUND_UP(udev->u1_params.pel, 1000); |
|
u2_sel = DIV_ROUND_UP(udev->u2_params.sel, 1000); |
|
u2_pel = DIV_ROUND_UP(udev->u2_params.pel, 1000); |
|
|
|
/* |
|
* Make sure that the calculated SEL and PEL values for the link |
|
* state we're enabling aren't bigger than the max SEL/PEL |
|
* value that will fit in the SET SEL control transfer. |
|
* Otherwise the device would get an incorrect idea of the exit |
|
* latency for the link state, and could start a device-initiated |
|
* U1/U2 when the exit latencies are too high. |
|
*/ |
|
if ((state == USB3_LPM_U1 && |
|
(u1_sel > USB3_LPM_MAX_U1_SEL_PEL || |
|
u1_pel > USB3_LPM_MAX_U1_SEL_PEL)) || |
|
(state == USB3_LPM_U2 && |
|
(u2_sel > USB3_LPM_MAX_U2_SEL_PEL || |
|
u2_pel > USB3_LPM_MAX_U2_SEL_PEL))) { |
|
dev_dbg(&udev->dev, "Device-initiated %s disabled due to long SEL %llu us or PEL %llu us\n", |
|
usb3_lpm_names[state], u1_sel, u1_pel); |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* If we're enabling device-initiated LPM for one link state, |
|
* but the other link state has a too high SEL or PEL value, |
|
* just set those values to the max in the Set SEL request. |
|
*/ |
|
if (u1_sel > USB3_LPM_MAX_U1_SEL_PEL) |
|
u1_sel = USB3_LPM_MAX_U1_SEL_PEL; |
|
|
|
if (u1_pel > USB3_LPM_MAX_U1_SEL_PEL) |
|
u1_pel = USB3_LPM_MAX_U1_SEL_PEL; |
|
|
|
if (u2_sel > USB3_LPM_MAX_U2_SEL_PEL) |
|
u2_sel = USB3_LPM_MAX_U2_SEL_PEL; |
|
|
|
if (u2_pel > USB3_LPM_MAX_U2_SEL_PEL) |
|
u2_pel = USB3_LPM_MAX_U2_SEL_PEL; |
|
|
|
/* |
|
* usb_enable_lpm() can be called as part of a failed device reset, |
|
* which may be initiated by an error path of a mass storage driver. |
|
* Therefore, use GFP_NOIO. |
|
*/ |
|
sel_values = kmalloc(sizeof *(sel_values), GFP_NOIO); |
|
if (!sel_values) |
|
return -ENOMEM; |
|
|
|
sel_values->u1_sel = u1_sel; |
|
sel_values->u1_pel = u1_pel; |
|
sel_values->u2_sel = cpu_to_le16(u2_sel); |
|
sel_values->u2_pel = cpu_to_le16(u2_pel); |
|
|
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_SEL, |
|
USB_RECIP_DEVICE, |
|
0, 0, |
|
sel_values, sizeof *(sel_values), |
|
USB_CTRL_SET_TIMEOUT); |
|
kfree(sel_values); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Enable or disable device-initiated U1 or U2 transitions. |
|
*/ |
|
static int usb_set_device_initiated_lpm(struct usb_device *udev, |
|
enum usb3_link_state state, bool enable) |
|
{ |
|
int ret; |
|
int feature; |
|
|
|
switch (state) { |
|
case USB3_LPM_U1: |
|
feature = USB_DEVICE_U1_ENABLE; |
|
break; |
|
case USB3_LPM_U2: |
|
feature = USB_DEVICE_U2_ENABLE; |
|
break; |
|
default: |
|
dev_warn(&udev->dev, "%s: Can't %s non-U1 or U2 state.\n", |
|
__func__, enable ? "enable" : "disable"); |
|
return -EINVAL; |
|
} |
|
|
|
if (udev->state != USB_STATE_CONFIGURED) { |
|
dev_dbg(&udev->dev, "%s: Can't %s %s state " |
|
"for unconfigured device.\n", |
|
__func__, enable ? "enable" : "disable", |
|
usb3_lpm_names[state]); |
|
return 0; |
|
} |
|
|
|
if (enable) { |
|
/* |
|
* Now send the control transfer to enable device-initiated LPM |
|
* for either U1 or U2. |
|
*/ |
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_FEATURE, |
|
USB_RECIP_DEVICE, |
|
feature, |
|
0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
} else { |
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_CLEAR_FEATURE, |
|
USB_RECIP_DEVICE, |
|
feature, |
|
0, NULL, 0, |
|
USB_CTRL_SET_TIMEOUT); |
|
} |
|
if (ret < 0) { |
|
dev_warn(&udev->dev, "%s of device-initiated %s failed.\n", |
|
enable ? "Enable" : "Disable", |
|
usb3_lpm_names[state]); |
|
return -EBUSY; |
|
} |
|
return 0; |
|
} |
|
|
|
static int usb_set_lpm_timeout(struct usb_device *udev, |
|
enum usb3_link_state state, int timeout) |
|
{ |
|
int ret; |
|
int feature; |
|
|
|
switch (state) { |
|
case USB3_LPM_U1: |
|
feature = USB_PORT_FEAT_U1_TIMEOUT; |
|
break; |
|
case USB3_LPM_U2: |
|
feature = USB_PORT_FEAT_U2_TIMEOUT; |
|
break; |
|
default: |
|
dev_warn(&udev->dev, "%s: Can't set timeout for non-U1 or U2 state.\n", |
|
__func__); |
|
return -EINVAL; |
|
} |
|
|
|
if (state == USB3_LPM_U1 && timeout > USB3_LPM_U1_MAX_TIMEOUT && |
|
timeout != USB3_LPM_DEVICE_INITIATED) { |
|
dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x, " |
|
"which is a reserved value.\n", |
|
usb3_lpm_names[state], timeout); |
|
return -EINVAL; |
|
} |
|
|
|
ret = set_port_feature(udev->parent, |
|
USB_PORT_LPM_TIMEOUT(timeout) | udev->portnum, |
|
feature); |
|
if (ret < 0) { |
|
dev_warn(&udev->dev, "Failed to set %s timeout to 0x%x," |
|
"error code %i\n", usb3_lpm_names[state], |
|
timeout, ret); |
|
return -EBUSY; |
|
} |
|
if (state == USB3_LPM_U1) |
|
udev->u1_params.timeout = timeout; |
|
else |
|
udev->u2_params.timeout = timeout; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Enable the hub-initiated U1/U2 idle timeouts, and enable device-initiated |
|
* U1/U2 entry. |
|
* |
|
* We will attempt to enable U1 or U2, but there are no guarantees that the |
|
* control transfers to set the hub timeout or enable device-initiated U1/U2 |
|
* will be successful. |
|
* |
|
* If the control transfer to enable device-initiated U1/U2 entry fails, then |
|
* hub-initiated U1/U2 will be disabled. |
|
* |
|
* If we cannot set the parent hub U1/U2 timeout, we attempt to let the xHCI |
|
* driver know about it. If that call fails, it should be harmless, and just |
|
* take up more slightly more bus bandwidth for unnecessary U1/U2 exit latency. |
|
*/ |
|
static void usb_enable_link_state(struct usb_hcd *hcd, struct usb_device *udev, |
|
enum usb3_link_state state) |
|
{ |
|
int timeout, ret; |
|
__u8 u1_mel = udev->bos->ss_cap->bU1devExitLat; |
|
__le16 u2_mel = udev->bos->ss_cap->bU2DevExitLat; |
|
|
|
/* If the device says it doesn't have *any* exit latency to come out of |
|
* U1 or U2, it's probably lying. Assume it doesn't implement that link |
|
* state. |
|
*/ |
|
if ((state == USB3_LPM_U1 && u1_mel == 0) || |
|
(state == USB3_LPM_U2 && u2_mel == 0)) |
|
return; |
|
|
|
/* |
|
* First, let the device know about the exit latencies |
|
* associated with the link state we're about to enable. |
|
*/ |
|
ret = usb_req_set_sel(udev, state); |
|
if (ret < 0) { |
|
dev_warn(&udev->dev, "Set SEL for device-initiated %s failed.\n", |
|
usb3_lpm_names[state]); |
|
return; |
|
} |
|
|
|
/* We allow the host controller to set the U1/U2 timeout internally |
|
* first, so that it can change its schedule to account for the |
|
* additional latency to send data to a device in a lower power |
|
* link state. |
|
*/ |
|
timeout = hcd->driver->enable_usb3_lpm_timeout(hcd, udev, state); |
|
|
|
/* xHCI host controller doesn't want to enable this LPM state. */ |
|
if (timeout == 0) |
|
return; |
|
|
|
if (timeout < 0) { |
|
dev_warn(&udev->dev, "Could not enable %s link state, " |
|
"xHCI error %i.\n", usb3_lpm_names[state], |
|
timeout); |
|
return; |
|
} |
|
|
|
if (usb_set_lpm_timeout(udev, state, timeout)) { |
|
/* If we can't set the parent hub U1/U2 timeout, |
|
* device-initiated LPM won't be allowed either, so let the xHCI |
|
* host know that this link state won't be enabled. |
|
*/ |
|
hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); |
|
return; |
|
} |
|
|
|
/* Only a configured device will accept the Set Feature |
|
* U1/U2_ENABLE |
|
*/ |
|
if (udev->actconfig && |
|
usb_set_device_initiated_lpm(udev, state, true) == 0) { |
|
if (state == USB3_LPM_U1) |
|
udev->usb3_lpm_u1_enabled = 1; |
|
else if (state == USB3_LPM_U2) |
|
udev->usb3_lpm_u2_enabled = 1; |
|
} else { |
|
/* Don't request U1/U2 entry if the device |
|
* cannot transition to U1/U2. |
|
*/ |
|
usb_set_lpm_timeout(udev, state, 0); |
|
hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state); |
|
} |
|
} |
|
|
|
/* |
|
* Disable the hub-initiated U1/U2 idle timeouts, and disable device-initiated |
|
* U1/U2 entry. |
|
* |
|
* If this function returns -EBUSY, the parent hub will still allow U1/U2 entry. |
|
* If zero is returned, the parent will not allow the link to go into U1/U2. |
|
* |
|
* If zero is returned, device-initiated U1/U2 entry may still be enabled, but |
|
* it won't have an effect on the bus link state because the parent hub will |
|
* still disallow device-initiated U1/U2 entry. |
|
* |
|
* If zero is returned, the xHCI host controller may still think U1/U2 entry is |
|
* possible. The result will be slightly more bus bandwidth will be taken up |
|
* (to account for U1/U2 exit latency), but it should be harmless. |
|
*/ |
|
static int usb_disable_link_state(struct usb_hcd *hcd, struct usb_device *udev, |
|
enum usb3_link_state state) |
|
{ |
|
switch (state) { |
|
case USB3_LPM_U1: |
|
case USB3_LPM_U2: |
|
break; |
|
default: |
|
dev_warn(&udev->dev, "%s: Can't disable non-U1 or U2 state.\n", |
|
__func__); |
|
return -EINVAL; |
|
} |
|
|
|
if (usb_set_lpm_timeout(udev, state, 0)) |
|
return -EBUSY; |
|
|
|
usb_set_device_initiated_lpm(udev, state, false); |
|
|
|
if (hcd->driver->disable_usb3_lpm_timeout(hcd, udev, state)) |
|
dev_warn(&udev->dev, "Could not disable xHCI %s timeout, " |
|
"bus schedule bandwidth may be impacted.\n", |
|
usb3_lpm_names[state]); |
|
|
|
/* As soon as usb_set_lpm_timeout(0) return 0, hub initiated LPM |
|
* is disabled. Hub will disallows link to enter U1/U2 as well, |
|
* even device is initiating LPM. Hence LPM is disabled if hub LPM |
|
* timeout set to 0, no matter device-initiated LPM is disabled or |
|
* not. |
|
*/ |
|
if (state == USB3_LPM_U1) |
|
udev->usb3_lpm_u1_enabled = 0; |
|
else if (state == USB3_LPM_U2) |
|
udev->usb3_lpm_u2_enabled = 0; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Disable hub-initiated and device-initiated U1 and U2 entry. |
|
* Caller must own the bandwidth_mutex. |
|
* |
|
* This will call usb_enable_lpm() on failure, which will decrement |
|
* lpm_disable_count, and will re-enable LPM if lpm_disable_count reaches zero. |
|
*/ |
|
int usb_disable_lpm(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd; |
|
|
|
if (!udev || !udev->parent || |
|
udev->speed < USB_SPEED_SUPER || |
|
!udev->lpm_capable || |
|
udev->state < USB_STATE_CONFIGURED) |
|
return 0; |
|
|
|
hcd = bus_to_hcd(udev->bus); |
|
if (!hcd || !hcd->driver->disable_usb3_lpm_timeout) |
|
return 0; |
|
|
|
udev->lpm_disable_count++; |
|
if ((udev->u1_params.timeout == 0 && udev->u2_params.timeout == 0)) |
|
return 0; |
|
|
|
/* If LPM is enabled, attempt to disable it. */ |
|
if (usb_disable_link_state(hcd, udev, USB3_LPM_U1)) |
|
goto enable_lpm; |
|
if (usb_disable_link_state(hcd, udev, USB3_LPM_U2)) |
|
goto enable_lpm; |
|
|
|
return 0; |
|
|
|
enable_lpm: |
|
usb_enable_lpm(udev); |
|
return -EBUSY; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_disable_lpm); |
|
|
|
/* Grab the bandwidth_mutex before calling usb_disable_lpm() */ |
|
int usb_unlocked_disable_lpm(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
int ret; |
|
|
|
if (!hcd) |
|
return -EINVAL; |
|
|
|
mutex_lock(hcd->bandwidth_mutex); |
|
ret = usb_disable_lpm(udev); |
|
mutex_unlock(hcd->bandwidth_mutex); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
|
|
|
/* |
|
* Attempt to enable device-initiated and hub-initiated U1 and U2 entry. The |
|
* xHCI host policy may prevent U1 or U2 from being enabled. |
|
* |
|
* Other callers may have disabled link PM, so U1 and U2 entry will be disabled |
|
* until the lpm_disable_count drops to zero. Caller must own the |
|
* bandwidth_mutex. |
|
*/ |
|
void usb_enable_lpm(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd; |
|
struct usb_hub *hub; |
|
struct usb_port *port_dev; |
|
|
|
if (!udev || !udev->parent || |
|
udev->speed < USB_SPEED_SUPER || |
|
!udev->lpm_capable || |
|
udev->state < USB_STATE_CONFIGURED) |
|
return; |
|
|
|
udev->lpm_disable_count--; |
|
hcd = bus_to_hcd(udev->bus); |
|
/* Double check that we can both enable and disable LPM. |
|
* Device must be configured to accept set feature U1/U2 timeout. |
|
*/ |
|
if (!hcd || !hcd->driver->enable_usb3_lpm_timeout || |
|
!hcd->driver->disable_usb3_lpm_timeout) |
|
return; |
|
|
|
if (udev->lpm_disable_count > 0) |
|
return; |
|
|
|
hub = usb_hub_to_struct_hub(udev->parent); |
|
if (!hub) |
|
return; |
|
|
|
port_dev = hub->ports[udev->portnum - 1]; |
|
|
|
if (port_dev->usb3_lpm_u1_permit) |
|
usb_enable_link_state(hcd, udev, USB3_LPM_U1); |
|
|
|
if (port_dev->usb3_lpm_u2_permit) |
|
usb_enable_link_state(hcd, udev, USB3_LPM_U2); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_enable_lpm); |
|
|
|
/* Grab the bandwidth_mutex before calling usb_enable_lpm() */ |
|
void usb_unlocked_enable_lpm(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
if (!hcd) |
|
return; |
|
|
|
mutex_lock(hcd->bandwidth_mutex); |
|
usb_enable_lpm(udev); |
|
mutex_unlock(hcd->bandwidth_mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
|
|
|
/* usb3 devices use U3 for disabled, make sure remote wakeup is disabled */ |
|
static void hub_usb3_port_prepare_disable(struct usb_hub *hub, |
|
struct usb_port *port_dev) |
|
{ |
|
struct usb_device *udev = port_dev->child; |
|
int ret; |
|
|
|
if (udev && udev->port_is_suspended && udev->do_remote_wakeup) { |
|
ret = hub_set_port_link_state(hub, port_dev->portnum, |
|
USB_SS_PORT_LS_U0); |
|
if (!ret) { |
|
msleep(USB_RESUME_TIMEOUT); |
|
ret = usb_disable_remote_wakeup(udev); |
|
} |
|
if (ret) |
|
dev_warn(&udev->dev, |
|
"Port disable: can't disable remote wake\n"); |
|
udev->do_remote_wakeup = 0; |
|
} |
|
} |
|
|
|
#else /* CONFIG_PM */ |
|
|
|
#define hub_suspend NULL |
|
#define hub_resume NULL |
|
#define hub_reset_resume NULL |
|
|
|
static inline void hub_usb3_port_prepare_disable(struct usb_hub *hub, |
|
struct usb_port *port_dev) { } |
|
|
|
int usb_disable_lpm(struct usb_device *udev) |
|
{ |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_disable_lpm); |
|
|
|
void usb_enable_lpm(struct usb_device *udev) { } |
|
EXPORT_SYMBOL_GPL(usb_enable_lpm); |
|
|
|
int usb_unlocked_disable_lpm(struct usb_device *udev) |
|
{ |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_unlocked_disable_lpm); |
|
|
|
void usb_unlocked_enable_lpm(struct usb_device *udev) { } |
|
EXPORT_SYMBOL_GPL(usb_unlocked_enable_lpm); |
|
|
|
int usb_disable_ltm(struct usb_device *udev) |
|
{ |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_disable_ltm); |
|
|
|
void usb_enable_ltm(struct usb_device *udev) { } |
|
EXPORT_SYMBOL_GPL(usb_enable_ltm); |
|
|
|
static int hub_handle_remote_wakeup(struct usb_hub *hub, unsigned int port, |
|
u16 portstatus, u16 portchange) |
|
{ |
|
return 0; |
|
} |
|
|
|
#endif /* CONFIG_PM */ |
|
|
|
/* |
|
* USB-3 does not have a similar link state as USB-2 that will avoid negotiating |
|
* a connection with a plugged-in cable but will signal the host when the cable |
|
* is unplugged. Disable remote wake and set link state to U3 for USB-3 devices |
|
*/ |
|
static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) |
|
{ |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
struct usb_device *hdev = hub->hdev; |
|
int ret = 0; |
|
|
|
if (!hub->error) { |
|
if (hub_is_superspeed(hub->hdev)) { |
|
hub_usb3_port_prepare_disable(hub, port_dev); |
|
ret = hub_set_port_link_state(hub, port_dev->portnum, |
|
USB_SS_PORT_LS_U3); |
|
} else { |
|
ret = usb_clear_port_feature(hdev, port1, |
|
USB_PORT_FEAT_ENABLE); |
|
} |
|
} |
|
if (port_dev->child && set_state) |
|
usb_set_device_state(port_dev->child, USB_STATE_NOTATTACHED); |
|
if (ret && ret != -ENODEV) |
|
dev_err(&port_dev->dev, "cannot disable (err = %d)\n", ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* usb_port_disable - disable a usb device's upstream port |
|
* @udev: device to disable |
|
* Context: @udev locked, must be able to sleep. |
|
* |
|
* Disables a USB device that isn't in active use. |
|
*/ |
|
int usb_port_disable(struct usb_device *udev) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
|
|
|
return hub_port_disable(hub, udev->portnum, 0); |
|
} |
|
|
|
/* USB 2.0 spec, 7.1.7.3 / fig 7-29: |
|
* |
|
* Between connect detection and reset signaling there must be a delay |
|
* of 100ms at least for debounce and power-settling. The corresponding |
|
* timer shall restart whenever the downstream port detects a disconnect. |
|
* |
|
* Apparently there are some bluetooth and irda-dongles and a number of |
|
* low-speed devices for which this debounce period may last over a second. |
|
* Not covered by the spec - but easy to deal with. |
|
* |
|
* This implementation uses a 1500ms total debounce timeout; if the |
|
* connection isn't stable by then it returns -ETIMEDOUT. It checks |
|
* every 25ms for transient disconnects. When the port status has been |
|
* unchanged for 100ms it returns the port status. |
|
*/ |
|
int hub_port_debounce(struct usb_hub *hub, int port1, bool must_be_connected) |
|
{ |
|
int ret; |
|
u16 portchange, portstatus; |
|
unsigned connection = 0xffff; |
|
int total_time, stable_time = 0; |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
|
|
for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) { |
|
ret = hub_port_status(hub, port1, &portstatus, &portchange); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (!(portchange & USB_PORT_STAT_C_CONNECTION) && |
|
(portstatus & USB_PORT_STAT_CONNECTION) == connection) { |
|
if (!must_be_connected || |
|
(connection == USB_PORT_STAT_CONNECTION)) |
|
stable_time += HUB_DEBOUNCE_STEP; |
|
if (stable_time >= HUB_DEBOUNCE_STABLE) |
|
break; |
|
} else { |
|
stable_time = 0; |
|
connection = portstatus & USB_PORT_STAT_CONNECTION; |
|
} |
|
|
|
if (portchange & USB_PORT_STAT_C_CONNECTION) { |
|
usb_clear_port_feature(hub->hdev, port1, |
|
USB_PORT_FEAT_C_CONNECTION); |
|
} |
|
|
|
if (total_time >= HUB_DEBOUNCE_TIMEOUT) |
|
break; |
|
msleep(HUB_DEBOUNCE_STEP); |
|
} |
|
|
|
dev_dbg(&port_dev->dev, "debounce total %dms stable %dms status 0x%x\n", |
|
total_time, stable_time, portstatus); |
|
|
|
if (stable_time < HUB_DEBOUNCE_STABLE) |
|
return -ETIMEDOUT; |
|
return portstatus; |
|
} |
|
|
|
void usb_ep0_reinit(struct usb_device *udev) |
|
{ |
|
usb_disable_endpoint(udev, 0 + USB_DIR_IN, true); |
|
usb_disable_endpoint(udev, 0 + USB_DIR_OUT, true); |
|
usb_enable_endpoint(udev, &udev->ep0, true); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_ep0_reinit); |
|
|
|
#define usb_sndaddr0pipe() (PIPE_CONTROL << 30) |
|
#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN) |
|
|
|
static int hub_set_address(struct usb_device *udev, int devnum) |
|
{ |
|
int retval; |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
/* |
|
* The host controller will choose the device address, |
|
* instead of the core having chosen it earlier |
|
*/ |
|
if (!hcd->driver->address_device && devnum <= 1) |
|
return -EINVAL; |
|
if (udev->state == USB_STATE_ADDRESS) |
|
return 0; |
|
if (udev->state != USB_STATE_DEFAULT) |
|
return -EINVAL; |
|
if (hcd->driver->address_device) |
|
retval = hcd->driver->address_device(hcd, udev); |
|
else |
|
retval = usb_control_msg(udev, usb_sndaddr0pipe(), |
|
USB_REQ_SET_ADDRESS, 0, devnum, 0, |
|
NULL, 0, USB_CTRL_SET_TIMEOUT); |
|
if (retval == 0) { |
|
update_devnum(udev, devnum); |
|
/* Device now using proper address. */ |
|
usb_set_device_state(udev, USB_STATE_ADDRESS); |
|
usb_ep0_reinit(udev); |
|
} |
|
return retval; |
|
} |
|
|
|
/* |
|
* There are reports of USB 3.0 devices that say they support USB 2.0 Link PM |
|
* when they're plugged into a USB 2.0 port, but they don't work when LPM is |
|
* enabled. |
|
* |
|
* Only enable USB 2.0 Link PM if the port is internal (hardwired), or the |
|
* device says it supports the new USB 2.0 Link PM errata by setting the BESL |
|
* support bit in the BOS descriptor. |
|
*/ |
|
static void hub_set_initial_usb2_lpm_policy(struct usb_device *udev) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
|
int connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN; |
|
|
|
if (!udev->usb2_hw_lpm_capable || !udev->bos) |
|
return; |
|
|
|
if (hub) |
|
connect_type = hub->ports[udev->portnum - 1]->connect_type; |
|
|
|
if ((udev->bos->ext_cap->bmAttributes & cpu_to_le32(USB_BESL_SUPPORT)) || |
|
connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
|
udev->usb2_hw_lpm_allowed = 1; |
|
usb_enable_usb2_hardware_lpm(udev); |
|
} |
|
} |
|
|
|
static int hub_enable_device(struct usb_device *udev) |
|
{ |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
|
|
if (!hcd->driver->enable_device) |
|
return 0; |
|
if (udev->state == USB_STATE_ADDRESS) |
|
return 0; |
|
if (udev->state != USB_STATE_DEFAULT) |
|
return -EINVAL; |
|
|
|
return hcd->driver->enable_device(hcd, udev); |
|
} |
|
|
|
/* Reset device, (re)assign address, get device descriptor. |
|
* Device connection must be stable, no more debouncing needed. |
|
* Returns device in USB_STATE_ADDRESS, except on error. |
|
* |
|
* If this is called for an already-existing device (as part of |
|
* usb_reset_and_verify_device), the caller must own the device lock and |
|
* the port lock. For a newly detected device that is not accessible |
|
* through any global pointers, it's not necessary to lock the device, |
|
* but it is still necessary to lock the port. |
|
*/ |
|
static int |
|
hub_port_init(struct usb_hub *hub, struct usb_device *udev, int port1, |
|
int retry_counter) |
|
{ |
|
struct usb_device *hdev = hub->hdev; |
|
struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
int retries, operations, retval, i; |
|
unsigned delay = HUB_SHORT_RESET_TIME; |
|
enum usb_device_speed oldspeed = udev->speed; |
|
const char *speed; |
|
int devnum = udev->devnum; |
|
const char *driver_name; |
|
bool do_new_scheme; |
|
|
|
/* root hub ports have a slightly longer reset period |
|
* (from USB 2.0 spec, section 7.1.7.5) |
|
*/ |
|
if (!hdev->parent) { |
|
delay = HUB_ROOT_RESET_TIME; |
|
if (port1 == hdev->bus->otg_port) |
|
hdev->bus->b_hnp_enable = 0; |
|
} |
|
|
|
/* Some low speed devices have problems with the quick delay, so */ |
|
/* be a bit pessimistic with those devices. RHbug #23670 */ |
|
if (oldspeed == USB_SPEED_LOW) |
|
delay = HUB_LONG_RESET_TIME; |
|
|
|
mutex_lock(hcd->address0_mutex); |
|
|
|
/* Reset the device; full speed may morph to high speed */ |
|
/* FIXME a USB 2.0 device may morph into SuperSpeed on reset. */ |
|
retval = hub_port_reset(hub, port1, udev, delay, false); |
|
if (retval < 0) /* error or disconnect */ |
|
goto fail; |
|
/* success, speed is known */ |
|
|
|
retval = -ENODEV; |
|
|
|
/* Don't allow speed changes at reset, except usb 3.0 to faster */ |
|
if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed && |
|
!(oldspeed == USB_SPEED_SUPER && udev->speed > oldspeed)) { |
|
dev_dbg(&udev->dev, "device reset changed speed!\n"); |
|
goto fail; |
|
} |
|
oldspeed = udev->speed; |
|
|
|
/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ... |
|
* it's fixed size except for full speed devices. |
|
* For Wireless USB devices, ep0 max packet is always 512 (tho |
|
* reported as 0xff in the device descriptor). WUSB1.0[4.8.1]. |
|
*/ |
|
switch (udev->speed) { |
|
case USB_SPEED_SUPER_PLUS: |
|
case USB_SPEED_SUPER: |
|
case USB_SPEED_WIRELESS: /* fixed at 512 */ |
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512); |
|
break; |
|
case USB_SPEED_HIGH: /* fixed at 64 */ |
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
|
break; |
|
case USB_SPEED_FULL: /* 8, 16, 32, or 64 */ |
|
/* to determine the ep0 maxpacket size, try to read |
|
* the device descriptor to get bMaxPacketSize0 and |
|
* then correct our initial guess. |
|
*/ |
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(64); |
|
break; |
|
case USB_SPEED_LOW: /* fixed at 8 */ |
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(8); |
|
break; |
|
default: |
|
goto fail; |
|
} |
|
|
|
if (udev->speed == USB_SPEED_WIRELESS) |
|
speed = "variable speed Wireless"; |
|
else |
|
speed = usb_speed_string(udev->speed); |
|
|
|
/* |
|
* The controller driver may be NULL if the controller device |
|
* is the middle device between platform device and roothub. |
|
* This middle device may not need a device driver due to |
|
* all hardware control can be at platform device driver, this |
|
* platform device is usually a dual-role USB controller device. |
|
*/ |
|
if (udev->bus->controller->driver) |
|
driver_name = udev->bus->controller->driver->name; |
|
else |
|
driver_name = udev->bus->sysdev->driver->name; |
|
|
|
if (udev->speed < USB_SPEED_SUPER) |
|
dev_info(&udev->dev, |
|
"%s %s USB device number %d using %s\n", |
|
(udev->config) ? "reset" : "new", speed, |
|
devnum, driver_name); |
|
|
|
/* Set up TT records, if needed */ |
|
if (hdev->tt) { |
|
udev->tt = hdev->tt; |
|
udev->ttport = hdev->ttport; |
|
} else if (udev->speed != USB_SPEED_HIGH |
|
&& hdev->speed == USB_SPEED_HIGH) { |
|
if (!hub->tt.hub) { |
|
dev_err(&udev->dev, "parent hub has no TT\n"); |
|
retval = -EINVAL; |
|
goto fail; |
|
} |
|
udev->tt = &hub->tt; |
|
udev->ttport = port1; |
|
} |
|
|
|
/* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way? |
|
* Because device hardware and firmware is sometimes buggy in |
|
* this area, and this is how Linux has done it for ages. |
|
* Change it cautiously. |
|
* |
|
* NOTE: If use_new_scheme() is true we will start by issuing |
|
* a 64-byte GET_DESCRIPTOR request. This is what Windows does, |
|
* so it may help with some non-standards-compliant devices. |
|
* Otherwise we start with SET_ADDRESS and then try to read the |
|
* first 8 bytes of the device descriptor to get the ep0 maxpacket |
|
* value. |
|
*/ |
|
do_new_scheme = use_new_scheme(udev, retry_counter, port_dev); |
|
|
|
for (retries = 0; retries < GET_DESCRIPTOR_TRIES; (++retries, msleep(100))) { |
|
if (do_new_scheme) { |
|
struct usb_device_descriptor *buf; |
|
int r = 0; |
|
|
|
retval = hub_enable_device(udev); |
|
if (retval < 0) { |
|
dev_err(&udev->dev, |
|
"hub failed to enable device, error %d\n", |
|
retval); |
|
goto fail; |
|
} |
|
|
|
#define GET_DESCRIPTOR_BUFSIZE 64 |
|
buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO); |
|
if (!buf) { |
|
retval = -ENOMEM; |
|
continue; |
|
} |
|
|
|
/* Retry on all errors; some devices are flakey. |
|
* 255 is for WUSB devices, we actually need to use |
|
* 512 (WUSB1.0[4.8.1]). |
|
*/ |
|
for (operations = 0; operations < GET_MAXPACKET0_TRIES; |
|
++operations) { |
|
buf->bMaxPacketSize0 = 0; |
|
r = usb_control_msg(udev, usb_rcvaddr0pipe(), |
|
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, |
|
USB_DT_DEVICE << 8, 0, |
|
buf, GET_DESCRIPTOR_BUFSIZE, |
|
initial_descriptor_timeout); |
|
switch (buf->bMaxPacketSize0) { |
|
case 8: case 16: case 32: case 64: case 255: |
|
if (buf->bDescriptorType == |
|
USB_DT_DEVICE) { |
|
r = 0; |
|
break; |
|
} |
|
fallthrough; |
|
default: |
|
if (r == 0) |
|
r = -EPROTO; |
|
break; |
|
} |
|
/* |
|
* Some devices time out if they are powered on |
|
* when already connected. They need a second |
|
* reset. But only on the first attempt, |
|
* lest we get into a time out/reset loop |
|
*/ |
|
if (r == 0 || (r == -ETIMEDOUT && |
|
retries == 0 && |
|
udev->speed > USB_SPEED_FULL)) |
|
break; |
|
} |
|
udev->descriptor.bMaxPacketSize0 = |
|
buf->bMaxPacketSize0; |
|
kfree(buf); |
|
|
|
retval = hub_port_reset(hub, port1, udev, delay, false); |
|
if (retval < 0) /* error or disconnect */ |
|
goto fail; |
|
if (oldspeed != udev->speed) { |
|
dev_dbg(&udev->dev, |
|
"device reset changed speed!\n"); |
|
retval = -ENODEV; |
|
goto fail; |
|
} |
|
if (r) { |
|
if (r != -ENODEV) |
|
dev_err(&udev->dev, "device descriptor read/64, error %d\n", |
|
r); |
|
retval = -EMSGSIZE; |
|
continue; |
|
} |
|
#undef GET_DESCRIPTOR_BUFSIZE |
|
} |
|
|
|
/* |
|
* If device is WUSB, we already assigned an |
|
* unauthorized address in the Connect Ack sequence; |
|
* authorization will assign the final address. |
|
*/ |
|
if (udev->wusb == 0) { |
|
for (operations = 0; operations < SET_ADDRESS_TRIES; ++operations) { |
|
retval = hub_set_address(udev, devnum); |
|
if (retval >= 0) |
|
break; |
|
msleep(200); |
|
} |
|
if (retval < 0) { |
|
if (retval != -ENODEV) |
|
dev_err(&udev->dev, "device not accepting address %d, error %d\n", |
|
devnum, retval); |
|
goto fail; |
|
} |
|
if (udev->speed >= USB_SPEED_SUPER) { |
|
devnum = udev->devnum; |
|
dev_info(&udev->dev, |
|
"%s SuperSpeed%s%s USB device number %d using %s\n", |
|
(udev->config) ? "reset" : "new", |
|
(udev->speed == USB_SPEED_SUPER_PLUS) ? |
|
"Plus Gen 2" : " Gen 1", |
|
(udev->rx_lanes == 2 && udev->tx_lanes == 2) ? |
|
"x2" : "", |
|
devnum, driver_name); |
|
} |
|
|
|
/* cope with hardware quirkiness: |
|
* - let SET_ADDRESS settle, some device hardware wants it |
|
* - read ep0 maxpacket even for high and low speed, |
|
*/ |
|
msleep(10); |
|
if (do_new_scheme) |
|
break; |
|
} |
|
|
|
retval = usb_get_device_descriptor(udev, 8); |
|
if (retval < 8) { |
|
if (retval != -ENODEV) |
|
dev_err(&udev->dev, |
|
"device descriptor read/8, error %d\n", |
|
retval); |
|
if (retval >= 0) |
|
retval = -EMSGSIZE; |
|
} else { |
|
u32 delay; |
|
|
|
retval = 0; |
|
|
|
delay = udev->parent->hub_delay; |
|
udev->hub_delay = min_t(u32, delay, |
|
USB_TP_TRANSMISSION_DELAY_MAX); |
|
retval = usb_set_isoch_delay(udev); |
|
if (retval) { |
|
dev_dbg(&udev->dev, |
|
"Failed set isoch delay, error %d\n", |
|
retval); |
|
retval = 0; |
|
} |
|
break; |
|
} |
|
} |
|
if (retval) |
|
goto fail; |
|
|
|
/* |
|
* Some superspeed devices have finished the link training process |
|
* and attached to a superspeed hub port, but the device descriptor |
|
* got from those devices show they aren't superspeed devices. Warm |
|
* reset the port attached by the devices can fix them. |
|
*/ |
|
if ((udev->speed >= USB_SPEED_SUPER) && |
|
(le16_to_cpu(udev->descriptor.bcdUSB) < 0x0300)) { |
|
dev_err(&udev->dev, "got a wrong device descriptor, " |
|
"warm reset device\n"); |
|
hub_port_reset(hub, port1, udev, |
|
HUB_BH_RESET_TIME, true); |
|
retval = -EINVAL; |
|
goto fail; |
|
} |
|
|
|
if (udev->descriptor.bMaxPacketSize0 == 0xff || |
|
udev->speed >= USB_SPEED_SUPER) |
|
i = 512; |
|
else |
|
i = udev->descriptor.bMaxPacketSize0; |
|
if (usb_endpoint_maxp(&udev->ep0.desc) != i) { |
|
if (udev->speed == USB_SPEED_LOW || |
|
!(i == 8 || i == 16 || i == 32 || i == 64)) { |
|
dev_err(&udev->dev, "Invalid ep0 maxpacket: %d\n", i); |
|
retval = -EMSGSIZE; |
|
goto fail; |
|
} |
|
if (udev->speed == USB_SPEED_FULL) |
|
dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i); |
|
else |
|
dev_warn(&udev->dev, "Using ep0 maxpacket: %d\n", i); |
|
udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i); |
|
usb_ep0_reinit(udev); |
|
} |
|
|
|
retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE); |
|
if (retval < (signed)sizeof(udev->descriptor)) { |
|
if (retval != -ENODEV) |
|
dev_err(&udev->dev, "device descriptor read/all, error %d\n", |
|
retval); |
|
if (retval >= 0) |
|
retval = -ENOMSG; |
|
goto fail; |
|
} |
|
|
|
usb_detect_quirks(udev); |
|
|
|
if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) { |
|
retval = usb_get_bos_descriptor(udev); |
|
if (!retval) { |
|
udev->lpm_capable = usb_device_supports_lpm(udev); |
|
usb_set_lpm_parameters(udev); |
|
} |
|
} |
|
|
|
retval = 0; |
|
/* notify HCD that we have a device connected and addressed */ |
|
if (hcd->driver->update_device) |
|
hcd->driver->update_device(hcd, udev); |
|
hub_set_initial_usb2_lpm_policy(udev); |
|
fail: |
|
if (retval) { |
|
hub_port_disable(hub, port1, 0); |
|
update_devnum(udev, devnum); /* for disconnect processing */ |
|
} |
|
mutex_unlock(hcd->address0_mutex); |
|
return retval; |
|
} |
|
|
|
static void |
|
check_highspeed(struct usb_hub *hub, struct usb_device *udev, int port1) |
|
{ |
|
struct usb_qualifier_descriptor *qual; |
|
int status; |
|
|
|
if (udev->quirks & USB_QUIRK_DEVICE_QUALIFIER) |
|
return; |
|
|
|
qual = kmalloc(sizeof *qual, GFP_KERNEL); |
|
if (qual == NULL) |
|
return; |
|
|
|
status = usb_get_descriptor(udev, USB_DT_DEVICE_QUALIFIER, 0, |
|
qual, sizeof *qual); |
|
if (status == sizeof *qual) { |
|
dev_info(&udev->dev, "not running at top speed; " |
|
"connect to a high speed hub\n"); |
|
/* hub LEDs are probably harder to miss than syslog */ |
|
if (hub->has_indicators) { |
|
hub->indicator[port1-1] = INDICATOR_GREEN_BLINK; |
|
queue_delayed_work(system_power_efficient_wq, |
|
&hub->leds, 0); |
|
} |
|
} |
|
kfree(qual); |
|
} |
|
|
|
static unsigned |
|
hub_power_remaining(struct usb_hub *hub) |
|
{ |
|
struct usb_device *hdev = hub->hdev; |
|
int remaining; |
|
int port1; |
|
|
|
if (!hub->limited_power) |
|
return 0; |
|
|
|
remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent; |
|
for (port1 = 1; port1 <= hdev->maxchild; ++port1) { |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
struct usb_device *udev = port_dev->child; |
|
unsigned unit_load; |
|
int delta; |
|
|
|
if (!udev) |
|
continue; |
|
if (hub_is_superspeed(udev)) |
|
unit_load = 150; |
|
else |
|
unit_load = 100; |
|
|
|
/* |
|
* Unconfigured devices may not use more than one unit load, |
|
* or 8mA for OTG ports |
|
*/ |
|
if (udev->actconfig) |
|
delta = usb_get_max_power(udev, udev->actconfig); |
|
else if (port1 != udev->bus->otg_port || hdev->parent) |
|
delta = unit_load; |
|
else |
|
delta = 8; |
|
if (delta > hub->mA_per_port) |
|
dev_warn(&port_dev->dev, "%dmA is over %umA budget!\n", |
|
delta, hub->mA_per_port); |
|
remaining -= delta; |
|
} |
|
if (remaining < 0) { |
|
dev_warn(hub->intfdev, "%dmA over power budget!\n", |
|
-remaining); |
|
remaining = 0; |
|
} |
|
return remaining; |
|
} |
|
|
|
|
|
static int descriptors_changed(struct usb_device *udev, |
|
struct usb_device_descriptor *old_device_descriptor, |
|
struct usb_host_bos *old_bos) |
|
{ |
|
int changed = 0; |
|
unsigned index; |
|
unsigned serial_len = 0; |
|
unsigned len; |
|
unsigned old_length; |
|
int length; |
|
char *buf; |
|
|
|
if (memcmp(&udev->descriptor, old_device_descriptor, |
|
sizeof(*old_device_descriptor)) != 0) |
|
return 1; |
|
|
|
if ((old_bos && !udev->bos) || (!old_bos && udev->bos)) |
|
return 1; |
|
if (udev->bos) { |
|
len = le16_to_cpu(udev->bos->desc->wTotalLength); |
|
if (len != le16_to_cpu(old_bos->desc->wTotalLength)) |
|
return 1; |
|
if (memcmp(udev->bos->desc, old_bos->desc, len)) |
|
return 1; |
|
} |
|
|
|
/* Since the idVendor, idProduct, and bcdDevice values in the |
|
* device descriptor haven't changed, we will assume the |
|
* Manufacturer and Product strings haven't changed either. |
|
* But the SerialNumber string could be different (e.g., a |
|
* different flash card of the same brand). |
|
*/ |
|
if (udev->serial) |
|
serial_len = strlen(udev->serial) + 1; |
|
|
|
len = serial_len; |
|
for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
|
old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
|
len = max(len, old_length); |
|
} |
|
|
|
buf = kmalloc(len, GFP_NOIO); |
|
if (!buf) |
|
/* assume the worst */ |
|
return 1; |
|
|
|
for (index = 0; index < udev->descriptor.bNumConfigurations; index++) { |
|
old_length = le16_to_cpu(udev->config[index].desc.wTotalLength); |
|
length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf, |
|
old_length); |
|
if (length != old_length) { |
|
dev_dbg(&udev->dev, "config index %d, error %d\n", |
|
index, length); |
|
changed = 1; |
|
break; |
|
} |
|
if (memcmp(buf, udev->rawdescriptors[index], old_length) |
|
!= 0) { |
|
dev_dbg(&udev->dev, "config index %d changed (#%d)\n", |
|
index, |
|
((struct usb_config_descriptor *) buf)-> |
|
bConfigurationValue); |
|
changed = 1; |
|
break; |
|
} |
|
} |
|
|
|
if (!changed && serial_len) { |
|
length = usb_string(udev, udev->descriptor.iSerialNumber, |
|
buf, serial_len); |
|
if (length + 1 != serial_len) { |
|
dev_dbg(&udev->dev, "serial string error %d\n", |
|
length); |
|
changed = 1; |
|
} else if (memcmp(buf, udev->serial, length) != 0) { |
|
dev_dbg(&udev->dev, "serial string changed\n"); |
|
changed = 1; |
|
} |
|
} |
|
|
|
kfree(buf); |
|
return changed; |
|
} |
|
|
|
static void hub_port_connect(struct usb_hub *hub, int port1, u16 portstatus, |
|
u16 portchange) |
|
{ |
|
int status = -ENODEV; |
|
int i; |
|
unsigned unit_load; |
|
struct usb_device *hdev = hub->hdev; |
|
struct usb_hcd *hcd = bus_to_hcd(hdev->bus); |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
struct usb_device *udev = port_dev->child; |
|
static int unreliable_port = -1; |
|
|
|
/* Disconnect any existing devices under this port */ |
|
if (udev) { |
|
if (hcd->usb_phy && !hdev->parent) |
|
usb_phy_notify_disconnect(hcd->usb_phy, udev->speed); |
|
usb_disconnect(&port_dev->child); |
|
} |
|
|
|
/* We can forget about a "removed" device when there's a physical |
|
* disconnect or the connect status changes. |
|
*/ |
|
if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
|
(portchange & USB_PORT_STAT_C_CONNECTION)) |
|
clear_bit(port1, hub->removed_bits); |
|
|
|
if (portchange & (USB_PORT_STAT_C_CONNECTION | |
|
USB_PORT_STAT_C_ENABLE)) { |
|
status = hub_port_debounce_be_stable(hub, port1); |
|
if (status < 0) { |
|
if (status != -ENODEV && |
|
port1 != unreliable_port && |
|
printk_ratelimit()) |
|
dev_err(&port_dev->dev, "connect-debounce failed\n"); |
|
portstatus &= ~USB_PORT_STAT_CONNECTION; |
|
unreliable_port = port1; |
|
} else { |
|
portstatus = status; |
|
} |
|
} |
|
|
|
/* Return now if debouncing failed or nothing is connected or |
|
* the device was "removed". |
|
*/ |
|
if (!(portstatus & USB_PORT_STAT_CONNECTION) || |
|
test_bit(port1, hub->removed_bits)) { |
|
|
|
/* |
|
* maybe switch power back on (e.g. root hub was reset) |
|
* but only if the port isn't owned by someone else. |
|
*/ |
|
if (hub_is_port_power_switchable(hub) |
|
&& !port_is_power_on(hub, portstatus) |
|
&& !port_dev->port_owner) |
|
set_port_feature(hdev, port1, USB_PORT_FEAT_POWER); |
|
|
|
if (portstatus & USB_PORT_STAT_ENABLE) |
|
goto done; |
|
return; |
|
} |
|
if (hub_is_superspeed(hub->hdev)) |
|
unit_load = 150; |
|
else |
|
unit_load = 100; |
|
|
|
status = 0; |
|
for (i = 0; i < PORT_INIT_TRIES; i++) { |
|
|
|
/* reallocate for each attempt, since references |
|
* to the previous one can escape in various ways |
|
*/ |
|
udev = usb_alloc_dev(hdev, hdev->bus, port1); |
|
if (!udev) { |
|
dev_err(&port_dev->dev, |
|
"couldn't allocate usb_device\n"); |
|
goto done; |
|
} |
|
|
|
usb_set_device_state(udev, USB_STATE_POWERED); |
|
udev->bus_mA = hub->mA_per_port; |
|
udev->level = hdev->level + 1; |
|
udev->wusb = hub_is_wusb(hub); |
|
|
|
/* Devices connected to SuperSpeed hubs are USB 3.0 or later */ |
|
if (hub_is_superspeed(hub->hdev)) |
|
udev->speed = USB_SPEED_SUPER; |
|
else |
|
udev->speed = USB_SPEED_UNKNOWN; |
|
|
|
choose_devnum(udev); |
|
if (udev->devnum <= 0) { |
|
status = -ENOTCONN; /* Don't retry */ |
|
goto loop; |
|
} |
|
|
|
/* reset (non-USB 3.0 devices) and get descriptor */ |
|
usb_lock_port(port_dev); |
|
status = hub_port_init(hub, udev, port1, i); |
|
usb_unlock_port(port_dev); |
|
if (status < 0) |
|
goto loop; |
|
|
|
if (udev->quirks & USB_QUIRK_DELAY_INIT) |
|
msleep(2000); |
|
|
|
/* consecutive bus-powered hubs aren't reliable; they can |
|
* violate the voltage drop budget. if the new child has |
|
* a "powered" LED, users should notice we didn't enable it |
|
* (without reading syslog), even without per-port LEDs |
|
* on the parent. |
|
*/ |
|
if (udev->descriptor.bDeviceClass == USB_CLASS_HUB |
|
&& udev->bus_mA <= unit_load) { |
|
u16 devstat; |
|
|
|
status = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, |
|
&devstat); |
|
if (status) { |
|
dev_dbg(&udev->dev, "get status %d ?\n", status); |
|
goto loop_disable; |
|
} |
|
if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) { |
|
dev_err(&udev->dev, |
|
"can't connect bus-powered hub " |
|
"to this port\n"); |
|
if (hub->has_indicators) { |
|
hub->indicator[port1-1] = |
|
INDICATOR_AMBER_BLINK; |
|
queue_delayed_work( |
|
system_power_efficient_wq, |
|
&hub->leds, 0); |
|
} |
|
status = -ENOTCONN; /* Don't retry */ |
|
goto loop_disable; |
|
} |
|
} |
|
|
|
/* check for devices running slower than they could */ |
|
if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200 |
|
&& udev->speed == USB_SPEED_FULL |
|
&& highspeed_hubs != 0) |
|
check_highspeed(hub, udev, port1); |
|
|
|
/* Store the parent's children[] pointer. At this point |
|
* udev becomes globally accessible, although presumably |
|
* no one will look at it until hdev is unlocked. |
|
*/ |
|
status = 0; |
|
|
|
mutex_lock(&usb_port_peer_mutex); |
|
|
|
/* We mustn't add new devices if the parent hub has |
|
* been disconnected; we would race with the |
|
* recursively_mark_NOTATTACHED() routine. |
|
*/ |
|
spin_lock_irq(&device_state_lock); |
|
if (hdev->state == USB_STATE_NOTATTACHED) |
|
status = -ENOTCONN; |
|
else |
|
port_dev->child = udev; |
|
spin_unlock_irq(&device_state_lock); |
|
mutex_unlock(&usb_port_peer_mutex); |
|
|
|
/* Run it through the hoops (find a driver, etc) */ |
|
if (!status) { |
|
status = usb_new_device(udev); |
|
if (status) { |
|
mutex_lock(&usb_port_peer_mutex); |
|
spin_lock_irq(&device_state_lock); |
|
port_dev->child = NULL; |
|
spin_unlock_irq(&device_state_lock); |
|
mutex_unlock(&usb_port_peer_mutex); |
|
} else { |
|
if (hcd->usb_phy && !hdev->parent) |
|
usb_phy_notify_connect(hcd->usb_phy, |
|
udev->speed); |
|
} |
|
} |
|
|
|
if (status) |
|
goto loop_disable; |
|
|
|
status = hub_power_remaining(hub); |
|
if (status) |
|
dev_dbg(hub->intfdev, "%dmA power budget left\n", status); |
|
|
|
return; |
|
|
|
loop_disable: |
|
hub_port_disable(hub, port1, 1); |
|
loop: |
|
usb_ep0_reinit(udev); |
|
release_devnum(udev); |
|
hub_free_dev(udev); |
|
usb_put_dev(udev); |
|
if ((status == -ENOTCONN) || (status == -ENOTSUPP)) |
|
break; |
|
|
|
/* When halfway through our retry count, power-cycle the port */ |
|
if (i == (PORT_INIT_TRIES - 1) / 2) { |
|
dev_info(&port_dev->dev, "attempt power cycle\n"); |
|
usb_hub_set_port_power(hdev, hub, port1, false); |
|
msleep(2 * hub_power_on_good_delay(hub)); |
|
usb_hub_set_port_power(hdev, hub, port1, true); |
|
msleep(hub_power_on_good_delay(hub)); |
|
} |
|
} |
|
if (hub->hdev->parent || |
|
!hcd->driver->port_handed_over || |
|
!(hcd->driver->port_handed_over)(hcd, port1)) { |
|
if (status != -ENOTCONN && status != -ENODEV) |
|
dev_err(&port_dev->dev, |
|
"unable to enumerate USB device\n"); |
|
} |
|
|
|
done: |
|
hub_port_disable(hub, port1, 1); |
|
if (hcd->driver->relinquish_port && !hub->hdev->parent) { |
|
if (status != -ENOTCONN && status != -ENODEV) |
|
hcd->driver->relinquish_port(hcd, port1); |
|
} |
|
} |
|
|
|
/* Handle physical or logical connection change events. |
|
* This routine is called when: |
|
* a port connection-change occurs; |
|
* a port enable-change occurs (often caused by EMI); |
|
* usb_reset_and_verify_device() encounters changed descriptors (as from |
|
* a firmware download) |
|
* caller already locked the hub |
|
*/ |
|
static void hub_port_connect_change(struct usb_hub *hub, int port1, |
|
u16 portstatus, u16 portchange) |
|
__must_hold(&port_dev->status_lock) |
|
{ |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
struct usb_device *udev = port_dev->child; |
|
struct usb_device_descriptor descriptor; |
|
int status = -ENODEV; |
|
int retval; |
|
|
|
dev_dbg(&port_dev->dev, "status %04x, change %04x, %s\n", portstatus, |
|
portchange, portspeed(hub, portstatus)); |
|
|
|
if (hub->has_indicators) { |
|
set_port_led(hub, port1, HUB_LED_AUTO); |
|
hub->indicator[port1-1] = INDICATOR_AUTO; |
|
} |
|
|
|
#ifdef CONFIG_USB_OTG |
|
/* during HNP, don't repeat the debounce */ |
|
if (hub->hdev->bus->is_b_host) |
|
portchange &= ~(USB_PORT_STAT_C_CONNECTION | |
|
USB_PORT_STAT_C_ENABLE); |
|
#endif |
|
|
|
/* Try to resuscitate an existing device */ |
|
if ((portstatus & USB_PORT_STAT_CONNECTION) && udev && |
|
udev->state != USB_STATE_NOTATTACHED) { |
|
if (portstatus & USB_PORT_STAT_ENABLE) { |
|
/* |
|
* USB-3 connections are initialized automatically by |
|
* the hostcontroller hardware. Therefore check for |
|
* changed device descriptors before resuscitating the |
|
* device. |
|
*/ |
|
descriptor = udev->descriptor; |
|
retval = usb_get_device_descriptor(udev, |
|
sizeof(udev->descriptor)); |
|
if (retval < 0) { |
|
dev_dbg(&udev->dev, |
|
"can't read device descriptor %d\n", |
|
retval); |
|
} else { |
|
if (descriptors_changed(udev, &descriptor, |
|
udev->bos)) { |
|
dev_dbg(&udev->dev, |
|
"device descriptor has changed\n"); |
|
/* for disconnect() calls */ |
|
udev->descriptor = descriptor; |
|
} else { |
|
status = 0; /* Nothing to do */ |
|
} |
|
} |
|
#ifdef CONFIG_PM |
|
} else if (udev->state == USB_STATE_SUSPENDED && |
|
udev->persist_enabled) { |
|
/* For a suspended device, treat this as a |
|
* remote wakeup event. |
|
*/ |
|
usb_unlock_port(port_dev); |
|
status = usb_remote_wakeup(udev); |
|
usb_lock_port(port_dev); |
|
#endif |
|
} else { |
|
/* Don't resuscitate */; |
|
} |
|
} |
|
clear_bit(port1, hub->change_bits); |
|
|
|
/* successfully revalidated the connection */ |
|
if (status == 0) |
|
return; |
|
|
|
usb_unlock_port(port_dev); |
|
hub_port_connect(hub, port1, portstatus, portchange); |
|
usb_lock_port(port_dev); |
|
} |
|
|
|
/* Handle notifying userspace about hub over-current events */ |
|
static void port_over_current_notify(struct usb_port *port_dev) |
|
{ |
|
char *envp[3]; |
|
struct device *hub_dev; |
|
char *port_dev_path; |
|
|
|
sysfs_notify(&port_dev->dev.kobj, NULL, "over_current_count"); |
|
|
|
hub_dev = port_dev->dev.parent; |
|
|
|
if (!hub_dev) |
|
return; |
|
|
|
port_dev_path = kobject_get_path(&port_dev->dev.kobj, GFP_KERNEL); |
|
if (!port_dev_path) |
|
return; |
|
|
|
envp[0] = kasprintf(GFP_KERNEL, "OVER_CURRENT_PORT=%s", port_dev_path); |
|
if (!envp[0]) |
|
goto exit_path; |
|
|
|
envp[1] = kasprintf(GFP_KERNEL, "OVER_CURRENT_COUNT=%u", |
|
port_dev->over_current_count); |
|
if (!envp[1]) |
|
goto exit; |
|
|
|
envp[2] = NULL; |
|
kobject_uevent_env(&hub_dev->kobj, KOBJ_CHANGE, envp); |
|
|
|
kfree(envp[1]); |
|
exit: |
|
kfree(envp[0]); |
|
exit_path: |
|
kfree(port_dev_path); |
|
} |
|
|
|
static void port_event(struct usb_hub *hub, int port1) |
|
__must_hold(&port_dev->status_lock) |
|
{ |
|
int connect_change; |
|
struct usb_port *port_dev = hub->ports[port1 - 1]; |
|
struct usb_device *udev = port_dev->child; |
|
struct usb_device *hdev = hub->hdev; |
|
u16 portstatus, portchange; |
|
|
|
connect_change = test_bit(port1, hub->change_bits); |
|
clear_bit(port1, hub->event_bits); |
|
clear_bit(port1, hub->wakeup_bits); |
|
|
|
if (hub_port_status(hub, port1, &portstatus, &portchange) < 0) |
|
return; |
|
|
|
if (portchange & USB_PORT_STAT_C_CONNECTION) { |
|
usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION); |
|
connect_change = 1; |
|
} |
|
|
|
if (portchange & USB_PORT_STAT_C_ENABLE) { |
|
if (!connect_change) |
|
dev_dbg(&port_dev->dev, "enable change, status %08x\n", |
|
portstatus); |
|
usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE); |
|
|
|
/* |
|
* EM interference sometimes causes badly shielded USB devices |
|
* to be shutdown by the hub, this hack enables them again. |
|
* Works at least with mouse driver. |
|
*/ |
|
if (!(portstatus & USB_PORT_STAT_ENABLE) |
|
&& !connect_change && udev) { |
|
dev_err(&port_dev->dev, "disabled by hub (EMI?), re-enabling...\n"); |
|
connect_change = 1; |
|
} |
|
} |
|
|
|
if (portchange & USB_PORT_STAT_C_OVERCURRENT) { |
|
u16 status = 0, unused; |
|
port_dev->over_current_count++; |
|
port_over_current_notify(port_dev); |
|
|
|
dev_notice(&port_dev->dev, "over-current change #%u\n", |
|
port_dev->over_current_count); |
|
usb_clear_port_feature(hdev, port1, |
|
USB_PORT_FEAT_C_OVER_CURRENT); |
|
msleep(100); /* Cool down */ |
|
hub_power_on(hub, true); |
|
hub_port_status(hub, port1, &status, &unused); |
|
if (status & USB_PORT_STAT_OVERCURRENT) |
|
dev_err(&port_dev->dev, "over-current condition\n"); |
|
} |
|
|
|
if (portchange & USB_PORT_STAT_C_RESET) { |
|
dev_dbg(&port_dev->dev, "reset change\n"); |
|
usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_RESET); |
|
} |
|
if ((portchange & USB_PORT_STAT_C_BH_RESET) |
|
&& hub_is_superspeed(hdev)) { |
|
dev_dbg(&port_dev->dev, "warm reset change\n"); |
|
usb_clear_port_feature(hdev, port1, |
|
USB_PORT_FEAT_C_BH_PORT_RESET); |
|
} |
|
if (portchange & USB_PORT_STAT_C_LINK_STATE) { |
|
dev_dbg(&port_dev->dev, "link state change\n"); |
|
usb_clear_port_feature(hdev, port1, |
|
USB_PORT_FEAT_C_PORT_LINK_STATE); |
|
} |
|
if (portchange & USB_PORT_STAT_C_CONFIG_ERROR) { |
|
dev_warn(&port_dev->dev, "config error\n"); |
|
usb_clear_port_feature(hdev, port1, |
|
USB_PORT_FEAT_C_PORT_CONFIG_ERROR); |
|
} |
|
|
|
/* skip port actions that require the port to be powered on */ |
|
if (!pm_runtime_active(&port_dev->dev)) |
|
return; |
|
|
|
if (hub_handle_remote_wakeup(hub, port1, portstatus, portchange)) |
|
connect_change = 1; |
|
|
|
/* |
|
* Warm reset a USB3 protocol port if it's in |
|
* SS.Inactive state. |
|
*/ |
|
if (hub_port_warm_reset_required(hub, port1, portstatus)) { |
|
dev_dbg(&port_dev->dev, "do warm reset\n"); |
|
if (!udev || !(portstatus & USB_PORT_STAT_CONNECTION) |
|
|| udev->state == USB_STATE_NOTATTACHED) { |
|
if (hub_port_reset(hub, port1, NULL, |
|
HUB_BH_RESET_TIME, true) < 0) |
|
hub_port_disable(hub, port1, 1); |
|
} else { |
|
usb_unlock_port(port_dev); |
|
usb_lock_device(udev); |
|
usb_reset_device(udev); |
|
usb_unlock_device(udev); |
|
usb_lock_port(port_dev); |
|
connect_change = 0; |
|
} |
|
} |
|
|
|
if (connect_change) |
|
hub_port_connect_change(hub, port1, portstatus, portchange); |
|
} |
|
|
|
static void hub_event(struct work_struct *work) |
|
{ |
|
struct usb_device *hdev; |
|
struct usb_interface *intf; |
|
struct usb_hub *hub; |
|
struct device *hub_dev; |
|
u16 hubstatus; |
|
u16 hubchange; |
|
int i, ret; |
|
|
|
hub = container_of(work, struct usb_hub, events); |
|
hdev = hub->hdev; |
|
hub_dev = hub->intfdev; |
|
intf = to_usb_interface(hub_dev); |
|
|
|
kcov_remote_start_usb((u64)hdev->bus->busnum); |
|
|
|
dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", |
|
hdev->state, hdev->maxchild, |
|
/* NOTE: expects max 15 ports... */ |
|
(u16) hub->change_bits[0], |
|
(u16) hub->event_bits[0]); |
|
|
|
/* Lock the device, then check to see if we were |
|
* disconnected while waiting for the lock to succeed. */ |
|
usb_lock_device(hdev); |
|
if (unlikely(hub->disconnected)) |
|
goto out_hdev_lock; |
|
|
|
/* If the hub has died, clean up after it */ |
|
if (hdev->state == USB_STATE_NOTATTACHED) { |
|
hub->error = -ENODEV; |
|
hub_quiesce(hub, HUB_DISCONNECT); |
|
goto out_hdev_lock; |
|
} |
|
|
|
/* Autoresume */ |
|
ret = usb_autopm_get_interface(intf); |
|
if (ret) { |
|
dev_dbg(hub_dev, "Can't autoresume: %d\n", ret); |
|
goto out_hdev_lock; |
|
} |
|
|
|
/* If this is an inactive hub, do nothing */ |
|
if (hub->quiescing) |
|
goto out_autopm; |
|
|
|
if (hub->error) { |
|
dev_dbg(hub_dev, "resetting for error %d\n", hub->error); |
|
|
|
ret = usb_reset_device(hdev); |
|
if (ret) { |
|
dev_dbg(hub_dev, "error resetting hub: %d\n", ret); |
|
goto out_autopm; |
|
} |
|
|
|
hub->nerrors = 0; |
|
hub->error = 0; |
|
} |
|
|
|
/* deal with port status changes */ |
|
for (i = 1; i <= hdev->maxchild; i++) { |
|
struct usb_port *port_dev = hub->ports[i - 1]; |
|
|
|
if (test_bit(i, hub->event_bits) |
|
|| test_bit(i, hub->change_bits) |
|
|| test_bit(i, hub->wakeup_bits)) { |
|
/* |
|
* The get_noresume and barrier ensure that if |
|
* the port was in the process of resuming, we |
|
* flush that work and keep the port active for |
|
* the duration of the port_event(). However, |
|
* if the port is runtime pm suspended |
|
* (powered-off), we leave it in that state, run |
|
* an abbreviated port_event(), and move on. |
|
*/ |
|
pm_runtime_get_noresume(&port_dev->dev); |
|
pm_runtime_barrier(&port_dev->dev); |
|
usb_lock_port(port_dev); |
|
port_event(hub, i); |
|
usb_unlock_port(port_dev); |
|
pm_runtime_put_sync(&port_dev->dev); |
|
} |
|
} |
|
|
|
/* deal with hub status changes */ |
|
if (test_and_clear_bit(0, hub->event_bits) == 0) |
|
; /* do nothing */ |
|
else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0) |
|
dev_err(hub_dev, "get_hub_status failed\n"); |
|
else { |
|
if (hubchange & HUB_CHANGE_LOCAL_POWER) { |
|
dev_dbg(hub_dev, "power change\n"); |
|
clear_hub_feature(hdev, C_HUB_LOCAL_POWER); |
|
if (hubstatus & HUB_STATUS_LOCAL_POWER) |
|
/* FIXME: Is this always true? */ |
|
hub->limited_power = 1; |
|
else |
|
hub->limited_power = 0; |
|
} |
|
if (hubchange & HUB_CHANGE_OVERCURRENT) { |
|
u16 status = 0; |
|
u16 unused; |
|
|
|
dev_dbg(hub_dev, "over-current change\n"); |
|
clear_hub_feature(hdev, C_HUB_OVER_CURRENT); |
|
msleep(500); /* Cool down */ |
|
hub_power_on(hub, true); |
|
hub_hub_status(hub, &status, &unused); |
|
if (status & HUB_STATUS_OVERCURRENT) |
|
dev_err(hub_dev, "over-current condition\n"); |
|
} |
|
} |
|
|
|
out_autopm: |
|
/* Balance the usb_autopm_get_interface() above */ |
|
usb_autopm_put_interface_no_suspend(intf); |
|
out_hdev_lock: |
|
usb_unlock_device(hdev); |
|
|
|
/* Balance the stuff in kick_hub_wq() and allow autosuspend */ |
|
usb_autopm_put_interface(intf); |
|
kref_put(&hub->kref, hub_release); |
|
|
|
kcov_remote_stop(); |
|
} |
|
|
|
static const struct usb_device_id hub_id_table[] = { |
|
{ .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
|
| USB_DEVICE_ID_MATCH_PRODUCT |
|
| USB_DEVICE_ID_MATCH_INT_CLASS, |
|
.idVendor = USB_VENDOR_SMSC, |
|
.idProduct = USB_PRODUCT_USB5534B, |
|
.bInterfaceClass = USB_CLASS_HUB, |
|
.driver_info = HUB_QUIRK_DISABLE_AUTOSUSPEND}, |
|
{ .match_flags = USB_DEVICE_ID_MATCH_VENDOR |
|
| USB_DEVICE_ID_MATCH_INT_CLASS, |
|
.idVendor = USB_VENDOR_GENESYS_LOGIC, |
|
.bInterfaceClass = USB_CLASS_HUB, |
|
.driver_info = HUB_QUIRK_CHECK_PORT_AUTOSUSPEND}, |
|
{ .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS, |
|
.bDeviceClass = USB_CLASS_HUB}, |
|
{ .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS, |
|
.bInterfaceClass = USB_CLASS_HUB}, |
|
{ } /* Terminating entry */ |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(usb, hub_id_table); |
|
|
|
static struct usb_driver hub_driver = { |
|
.name = "hub", |
|
.probe = hub_probe, |
|
.disconnect = hub_disconnect, |
|
.suspend = hub_suspend, |
|
.resume = hub_resume, |
|
.reset_resume = hub_reset_resume, |
|
.pre_reset = hub_pre_reset, |
|
.post_reset = hub_post_reset, |
|
.unlocked_ioctl = hub_ioctl, |
|
.id_table = hub_id_table, |
|
.supports_autosuspend = 1, |
|
}; |
|
|
|
int usb_hub_init(void) |
|
{ |
|
if (usb_register(&hub_driver) < 0) { |
|
printk(KERN_ERR "%s: can't register hub driver\n", |
|
usbcore_name); |
|
return -1; |
|
} |
|
|
|
/* |
|
* The workqueue needs to be freezable to avoid interfering with |
|
* USB-PERSIST port handover. Otherwise it might see that a full-speed |
|
* device was gone before the EHCI controller had handed its port |
|
* over to the companion full-speed controller. |
|
*/ |
|
hub_wq = alloc_workqueue("usb_hub_wq", WQ_FREEZABLE, 0); |
|
if (hub_wq) |
|
return 0; |
|
|
|
/* Fall through if kernel_thread failed */ |
|
usb_deregister(&hub_driver); |
|
pr_err("%s: can't allocate workqueue for usb hub\n", usbcore_name); |
|
|
|
return -1; |
|
} |
|
|
|
void usb_hub_cleanup(void) |
|
{ |
|
destroy_workqueue(hub_wq); |
|
|
|
/* |
|
* Hub resources are freed for us by usb_deregister. It calls |
|
* usb_driver_purge on every device which in turn calls that |
|
* devices disconnect function if it is using this driver. |
|
* The hub_disconnect function takes care of releasing the |
|
* individual hub resources. -greg |
|
*/ |
|
usb_deregister(&hub_driver); |
|
} /* usb_hub_cleanup() */ |
|
|
|
/** |
|
* usb_reset_and_verify_device - perform a USB port reset to reinitialize a device |
|
* @udev: device to reset (not in SUSPENDED or NOTATTACHED state) |
|
* |
|
* WARNING - don't use this routine to reset a composite device |
|
* (one with multiple interfaces owned by separate drivers)! |
|
* Use usb_reset_device() instead. |
|
* |
|
* Do a port reset, reassign the device's address, and establish its |
|
* former operating configuration. If the reset fails, or the device's |
|
* descriptors change from their values before the reset, or the original |
|
* configuration and altsettings cannot be restored, a flag will be set |
|
* telling hub_wq to pretend the device has been disconnected and then |
|
* re-connected. All drivers will be unbound, and the device will be |
|
* re-enumerated and probed all over again. |
|
* |
|
* Return: 0 if the reset succeeded, -ENODEV if the device has been |
|
* flagged for logical disconnection, or some other negative error code |
|
* if the reset wasn't even attempted. |
|
* |
|
* Note: |
|
* The caller must own the device lock and the port lock, the latter is |
|
* taken by usb_reset_device(). For example, it's safe to use |
|
* usb_reset_device() from a driver probe() routine after downloading |
|
* new firmware. For calls that might not occur during probe(), drivers |
|
* should lock the device using usb_lock_device_for_reset(). |
|
* |
|
* Locking exception: This routine may also be called from within an |
|
* autoresume handler. Such usage won't conflict with other tasks |
|
* holding the device lock because these tasks should always call |
|
* usb_autopm_resume_device(), thereby preventing any unwanted |
|
* autoresume. The autoresume handler is expected to have already |
|
* acquired the port lock before calling this routine. |
|
*/ |
|
static int usb_reset_and_verify_device(struct usb_device *udev) |
|
{ |
|
struct usb_device *parent_hdev = udev->parent; |
|
struct usb_hub *parent_hub; |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
struct usb_device_descriptor descriptor = udev->descriptor; |
|
struct usb_host_bos *bos; |
|
int i, j, ret = 0; |
|
int port1 = udev->portnum; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED || |
|
udev->state == USB_STATE_SUSPENDED) { |
|
dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
|
udev->state); |
|
return -EINVAL; |
|
} |
|
|
|
if (!parent_hdev) |
|
return -EISDIR; |
|
|
|
parent_hub = usb_hub_to_struct_hub(parent_hdev); |
|
|
|
/* Disable USB2 hardware LPM. |
|
* It will be re-enabled by the enumeration process. |
|
*/ |
|
usb_disable_usb2_hardware_lpm(udev); |
|
|
|
/* Disable LPM while we reset the device and reinstall the alt settings. |
|
* Device-initiated LPM, and system exit latency settings are cleared |
|
* when the device is reset, so we have to set them up again. |
|
*/ |
|
ret = usb_unlocked_disable_lpm(udev); |
|
if (ret) { |
|
dev_err(&udev->dev, "%s Failed to disable LPM\n", __func__); |
|
goto re_enumerate_no_bos; |
|
} |
|
|
|
bos = udev->bos; |
|
udev->bos = NULL; |
|
|
|
for (i = 0; i < PORT_INIT_TRIES; ++i) { |
|
|
|
/* ep0 maxpacket size may change; let the HCD know about it. |
|
* Other endpoints will be handled by re-enumeration. */ |
|
usb_ep0_reinit(udev); |
|
ret = hub_port_init(parent_hub, udev, port1, i); |
|
if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) |
|
break; |
|
} |
|
|
|
if (ret < 0) |
|
goto re_enumerate; |
|
|
|
/* Device might have changed firmware (DFU or similar) */ |
|
if (descriptors_changed(udev, &descriptor, bos)) { |
|
dev_info(&udev->dev, "device firmware changed\n"); |
|
udev->descriptor = descriptor; /* for disconnect() calls */ |
|
goto re_enumerate; |
|
} |
|
|
|
/* Restore the device's previous configuration */ |
|
if (!udev->actconfig) |
|
goto done; |
|
|
|
mutex_lock(hcd->bandwidth_mutex); |
|
ret = usb_hcd_alloc_bandwidth(udev, udev->actconfig, NULL, NULL); |
|
if (ret < 0) { |
|
dev_warn(&udev->dev, |
|
"Busted HC? Not enough HCD resources for " |
|
"old configuration.\n"); |
|
mutex_unlock(hcd->bandwidth_mutex); |
|
goto re_enumerate; |
|
} |
|
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
|
USB_REQ_SET_CONFIGURATION, 0, |
|
udev->actconfig->desc.bConfigurationValue, 0, |
|
NULL, 0, USB_CTRL_SET_TIMEOUT); |
|
if (ret < 0) { |
|
dev_err(&udev->dev, |
|
"can't restore configuration #%d (error=%d)\n", |
|
udev->actconfig->desc.bConfigurationValue, ret); |
|
mutex_unlock(hcd->bandwidth_mutex); |
|
goto re_enumerate; |
|
} |
|
mutex_unlock(hcd->bandwidth_mutex); |
|
usb_set_device_state(udev, USB_STATE_CONFIGURED); |
|
|
|
/* Put interfaces back into the same altsettings as before. |
|
* Don't bother to send the Set-Interface request for interfaces |
|
* that were already in altsetting 0; besides being unnecessary, |
|
* many devices can't handle it. Instead just reset the host-side |
|
* endpoint state. |
|
*/ |
|
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
|
struct usb_host_config *config = udev->actconfig; |
|
struct usb_interface *intf = config->interface[i]; |
|
struct usb_interface_descriptor *desc; |
|
|
|
desc = &intf->cur_altsetting->desc; |
|
if (desc->bAlternateSetting == 0) { |
|
usb_disable_interface(udev, intf, true); |
|
usb_enable_interface(udev, intf, true); |
|
ret = 0; |
|
} else { |
|
/* Let the bandwidth allocation function know that this |
|
* device has been reset, and it will have to use |
|
* alternate setting 0 as the current alternate setting. |
|
*/ |
|
intf->resetting_device = 1; |
|
ret = usb_set_interface(udev, desc->bInterfaceNumber, |
|
desc->bAlternateSetting); |
|
intf->resetting_device = 0; |
|
} |
|
if (ret < 0) { |
|
dev_err(&udev->dev, "failed to restore interface %d " |
|
"altsetting %d (error=%d)\n", |
|
desc->bInterfaceNumber, |
|
desc->bAlternateSetting, |
|
ret); |
|
goto re_enumerate; |
|
} |
|
/* Resetting also frees any allocated streams */ |
|
for (j = 0; j < intf->cur_altsetting->desc.bNumEndpoints; j++) |
|
intf->cur_altsetting->endpoint[j].streams = 0; |
|
} |
|
|
|
done: |
|
/* Now that the alt settings are re-installed, enable LTM and LPM. */ |
|
usb_enable_usb2_hardware_lpm(udev); |
|
usb_unlocked_enable_lpm(udev); |
|
usb_enable_ltm(udev); |
|
usb_release_bos_descriptor(udev); |
|
udev->bos = bos; |
|
return 0; |
|
|
|
re_enumerate: |
|
usb_release_bos_descriptor(udev); |
|
udev->bos = bos; |
|
re_enumerate_no_bos: |
|
/* LPM state doesn't matter when we're about to destroy the device. */ |
|
hub_port_logical_disconnect(parent_hub, port1); |
|
return -ENODEV; |
|
} |
|
|
|
/** |
|
* usb_reset_device - warn interface drivers and perform a USB port reset |
|
* @udev: device to reset (not in NOTATTACHED state) |
|
* |
|
* Warns all drivers bound to registered interfaces (using their pre_reset |
|
* method), performs the port reset, and then lets the drivers know that |
|
* the reset is over (using their post_reset method). |
|
* |
|
* Return: The same as for usb_reset_and_verify_device(). |
|
* |
|
* Note: |
|
* The caller must own the device lock. For example, it's safe to use |
|
* this from a driver probe() routine after downloading new firmware. |
|
* For calls that might not occur during probe(), drivers should lock |
|
* the device using usb_lock_device_for_reset(). |
|
* |
|
* If an interface is currently being probed or disconnected, we assume |
|
* its driver knows how to handle resets. For all other interfaces, |
|
* if the driver doesn't have pre_reset and post_reset methods then |
|
* we attempt to unbind it and rebind afterward. |
|
*/ |
|
int usb_reset_device(struct usb_device *udev) |
|
{ |
|
int ret; |
|
int i; |
|
unsigned int noio_flag; |
|
struct usb_port *port_dev; |
|
struct usb_host_config *config = udev->actconfig; |
|
struct usb_hub *hub = usb_hub_to_struct_hub(udev->parent); |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED) { |
|
dev_dbg(&udev->dev, "device reset not allowed in state %d\n", |
|
udev->state); |
|
return -EINVAL; |
|
} |
|
|
|
if (!udev->parent) { |
|
/* this requires hcd-specific logic; see ohci_restart() */ |
|
dev_dbg(&udev->dev, "%s for root hub!\n", __func__); |
|
return -EISDIR; |
|
} |
|
|
|
port_dev = hub->ports[udev->portnum - 1]; |
|
|
|
/* |
|
* Don't allocate memory with GFP_KERNEL in current |
|
* context to avoid possible deadlock if usb mass |
|
* storage interface or usbnet interface(iSCSI case) |
|
* is included in current configuration. The easist |
|
* approach is to do it for every device reset, |
|
* because the device 'memalloc_noio' flag may have |
|
* not been set before reseting the usb device. |
|
*/ |
|
noio_flag = memalloc_noio_save(); |
|
|
|
/* Prevent autosuspend during the reset */ |
|
usb_autoresume_device(udev); |
|
|
|
if (config) { |
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
|
struct usb_interface *cintf = config->interface[i]; |
|
struct usb_driver *drv; |
|
int unbind = 0; |
|
|
|
if (cintf->dev.driver) { |
|
drv = to_usb_driver(cintf->dev.driver); |
|
if (drv->pre_reset && drv->post_reset) |
|
unbind = (drv->pre_reset)(cintf); |
|
else if (cintf->condition == |
|
USB_INTERFACE_BOUND) |
|
unbind = 1; |
|
if (unbind) |
|
usb_forced_unbind_intf(cintf); |
|
} |
|
} |
|
} |
|
|
|
usb_lock_port(port_dev); |
|
ret = usb_reset_and_verify_device(udev); |
|
usb_unlock_port(port_dev); |
|
|
|
if (config) { |
|
for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) { |
|
struct usb_interface *cintf = config->interface[i]; |
|
struct usb_driver *drv; |
|
int rebind = cintf->needs_binding; |
|
|
|
if (!rebind && cintf->dev.driver) { |
|
drv = to_usb_driver(cintf->dev.driver); |
|
if (drv->post_reset) |
|
rebind = (drv->post_reset)(cintf); |
|
else if (cintf->condition == |
|
USB_INTERFACE_BOUND) |
|
rebind = 1; |
|
if (rebind) |
|
cintf->needs_binding = 1; |
|
} |
|
} |
|
|
|
/* If the reset failed, hub_wq will unbind drivers later */ |
|
if (ret == 0) |
|
usb_unbind_and_rebind_marked_interfaces(udev); |
|
} |
|
|
|
usb_autosuspend_device(udev); |
|
memalloc_noio_restore(noio_flag); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_reset_device); |
|
|
|
|
|
/** |
|
* usb_queue_reset_device - Reset a USB device from an atomic context |
|
* @iface: USB interface belonging to the device to reset |
|
* |
|
* This function can be used to reset a USB device from an atomic |
|
* context, where usb_reset_device() won't work (as it blocks). |
|
* |
|
* Doing a reset via this method is functionally equivalent to calling |
|
* usb_reset_device(), except for the fact that it is delayed to a |
|
* workqueue. This means that any drivers bound to other interfaces |
|
* might be unbound, as well as users from usbfs in user space. |
|
* |
|
* Corner cases: |
|
* |
|
* - Scheduling two resets at the same time from two different drivers |
|
* attached to two different interfaces of the same device is |
|
* possible; depending on how the driver attached to each interface |
|
* handles ->pre_reset(), the second reset might happen or not. |
|
* |
|
* - If the reset is delayed so long that the interface is unbound from |
|
* its driver, the reset will be skipped. |
|
* |
|
* - This function can be called during .probe(). It can also be called |
|
* during .disconnect(), but doing so is pointless because the reset |
|
* will not occur. If you really want to reset the device during |
|
* .disconnect(), call usb_reset_device() directly -- but watch out |
|
* for nested unbinding issues! |
|
*/ |
|
void usb_queue_reset_device(struct usb_interface *iface) |
|
{ |
|
if (schedule_work(&iface->reset_ws)) |
|
usb_get_intf(iface); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_queue_reset_device); |
|
|
|
/** |
|
* usb_hub_find_child - Get the pointer of child device |
|
* attached to the port which is specified by @port1. |
|
* @hdev: USB device belonging to the usb hub |
|
* @port1: port num to indicate which port the child device |
|
* is attached to. |
|
* |
|
* USB drivers call this function to get hub's child device |
|
* pointer. |
|
* |
|
* Return: %NULL if input param is invalid and |
|
* child's usb_device pointer if non-NULL. |
|
*/ |
|
struct usb_device *usb_hub_find_child(struct usb_device *hdev, |
|
int port1) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
|
|
|
if (port1 < 1 || port1 > hdev->maxchild) |
|
return NULL; |
|
return hub->ports[port1 - 1]->child; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_hub_find_child); |
|
|
|
void usb_hub_adjust_deviceremovable(struct usb_device *hdev, |
|
struct usb_hub_descriptor *desc) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
|
enum usb_port_connect_type connect_type; |
|
int i; |
|
|
|
if (!hub) |
|
return; |
|
|
|
if (!hub_is_superspeed(hdev)) { |
|
for (i = 1; i <= hdev->maxchild; i++) { |
|
struct usb_port *port_dev = hub->ports[i - 1]; |
|
|
|
connect_type = port_dev->connect_type; |
|
if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
|
u8 mask = 1 << (i%8); |
|
|
|
if (!(desc->u.hs.DeviceRemovable[i/8] & mask)) { |
|
dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
|
desc->u.hs.DeviceRemovable[i/8] |= mask; |
|
} |
|
} |
|
} |
|
} else { |
|
u16 port_removable = le16_to_cpu(desc->u.ss.DeviceRemovable); |
|
|
|
for (i = 1; i <= hdev->maxchild; i++) { |
|
struct usb_port *port_dev = hub->ports[i - 1]; |
|
|
|
connect_type = port_dev->connect_type; |
|
if (connect_type == USB_PORT_CONNECT_TYPE_HARD_WIRED) { |
|
u16 mask = 1 << i; |
|
|
|
if (!(port_removable & mask)) { |
|
dev_dbg(&port_dev->dev, "DeviceRemovable is changed to 1 according to platform information.\n"); |
|
port_removable |= mask; |
|
} |
|
} |
|
} |
|
|
|
desc->u.ss.DeviceRemovable = cpu_to_le16(port_removable); |
|
} |
|
} |
|
|
|
#ifdef CONFIG_ACPI |
|
/** |
|
* usb_get_hub_port_acpi_handle - Get the usb port's acpi handle |
|
* @hdev: USB device belonging to the usb hub |
|
* @port1: port num of the port |
|
* |
|
* Return: Port's acpi handle if successful, %NULL if params are |
|
* invalid. |
|
*/ |
|
acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev, |
|
int port1) |
|
{ |
|
struct usb_hub *hub = usb_hub_to_struct_hub(hdev); |
|
|
|
if (!hub) |
|
return NULL; |
|
|
|
return ACPI_HANDLE(&hub->ports[port1 - 1]->dev); |
|
} |
|
#endif
|
|
|