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1370 lines
33 KiB
1370 lines
33 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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* cdc-wdm.c |
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* |
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* This driver supports USB CDC WCM Device Management. |
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* |
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* Copyright (c) 2007-2009 Oliver Neukum |
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* |
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* Some code taken from cdc-acm.c |
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* |
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* Released under the GPLv2. |
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* |
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* Many thanks to Carl Nordbeck |
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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/ioctl.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/uaccess.h> |
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#include <linux/bitops.h> |
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#include <linux/poll.h> |
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#include <linux/skbuff.h> |
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#include <linux/usb.h> |
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#include <linux/usb/cdc.h> |
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#include <linux/wwan.h> |
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#include <asm/byteorder.h> |
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#include <asm/unaligned.h> |
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#include <linux/usb/cdc-wdm.h> |
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|
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#define DRIVER_AUTHOR "Oliver Neukum" |
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#define DRIVER_DESC "USB Abstract Control Model driver for USB WCM Device Management" |
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|
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static const struct usb_device_id wdm_ids[] = { |
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{ |
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.match_flags = USB_DEVICE_ID_MATCH_INT_CLASS | |
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USB_DEVICE_ID_MATCH_INT_SUBCLASS, |
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.bInterfaceClass = USB_CLASS_COMM, |
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.bInterfaceSubClass = USB_CDC_SUBCLASS_DMM |
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}, |
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{ } |
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}; |
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|
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MODULE_DEVICE_TABLE (usb, wdm_ids); |
|
|
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#define WDM_MINOR_BASE 176 |
|
|
|
|
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#define WDM_IN_USE 1 |
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#define WDM_DISCONNECTING 2 |
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#define WDM_RESULT 3 |
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#define WDM_READ 4 |
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#define WDM_INT_STALL 5 |
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#define WDM_POLL_RUNNING 6 |
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#define WDM_RESPONDING 7 |
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#define WDM_SUSPENDING 8 |
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#define WDM_RESETTING 9 |
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#define WDM_OVERFLOW 10 |
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#define WDM_WWAN_IN_USE 11 |
|
|
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#define WDM_MAX 16 |
|
|
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/* we cannot wait forever at flush() */ |
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#define WDM_FLUSH_TIMEOUT (30 * HZ) |
|
|
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/* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */ |
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#define WDM_DEFAULT_BUFSIZE 256 |
|
|
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static DEFINE_MUTEX(wdm_mutex); |
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static DEFINE_SPINLOCK(wdm_device_list_lock); |
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static LIST_HEAD(wdm_device_list); |
|
|
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/* --- method tables --- */ |
|
|
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struct wdm_device { |
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u8 *inbuf; /* buffer for response */ |
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u8 *outbuf; /* buffer for command */ |
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u8 *sbuf; /* buffer for status */ |
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u8 *ubuf; /* buffer for copy to user space */ |
|
|
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struct urb *command; |
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struct urb *response; |
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struct urb *validity; |
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struct usb_interface *intf; |
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struct usb_ctrlrequest *orq; |
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struct usb_ctrlrequest *irq; |
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spinlock_t iuspin; |
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|
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unsigned long flags; |
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u16 bufsize; |
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u16 wMaxCommand; |
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u16 wMaxPacketSize; |
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__le16 inum; |
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int reslength; |
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int length; |
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int read; |
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int count; |
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dma_addr_t shandle; |
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dma_addr_t ihandle; |
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struct mutex wlock; |
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struct mutex rlock; |
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wait_queue_head_t wait; |
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struct work_struct rxwork; |
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struct work_struct service_outs_intr; |
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int werr; |
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int rerr; |
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int resp_count; |
|
|
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struct list_head device_list; |
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int (*manage_power)(struct usb_interface *, int); |
|
|
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enum wwan_port_type wwanp_type; |
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struct wwan_port *wwanp; |
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}; |
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|
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static struct usb_driver wdm_driver; |
|
|
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/* return intfdata if we own the interface, else look up intf in the list */ |
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static struct wdm_device *wdm_find_device(struct usb_interface *intf) |
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{ |
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struct wdm_device *desc; |
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|
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spin_lock(&wdm_device_list_lock); |
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list_for_each_entry(desc, &wdm_device_list, device_list) |
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if (desc->intf == intf) |
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goto found; |
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desc = NULL; |
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found: |
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spin_unlock(&wdm_device_list_lock); |
|
|
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return desc; |
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} |
|
|
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static struct wdm_device *wdm_find_device_by_minor(int minor) |
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{ |
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struct wdm_device *desc; |
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|
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spin_lock(&wdm_device_list_lock); |
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list_for_each_entry(desc, &wdm_device_list, device_list) |
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if (desc->intf->minor == minor) |
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goto found; |
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desc = NULL; |
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found: |
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spin_unlock(&wdm_device_list_lock); |
|
|
|
return desc; |
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} |
|
|
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/* --- callbacks --- */ |
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static void wdm_out_callback(struct urb *urb) |
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{ |
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struct wdm_device *desc; |
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unsigned long flags; |
|
|
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desc = urb->context; |
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spin_lock_irqsave(&desc->iuspin, flags); |
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desc->werr = urb->status; |
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spin_unlock_irqrestore(&desc->iuspin, flags); |
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kfree(desc->outbuf); |
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desc->outbuf = NULL; |
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clear_bit(WDM_IN_USE, &desc->flags); |
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wake_up_all(&desc->wait); |
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} |
|
|
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static void wdm_wwan_rx(struct wdm_device *desc, int length); |
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|
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static void wdm_in_callback(struct urb *urb) |
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{ |
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unsigned long flags; |
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struct wdm_device *desc = urb->context; |
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int status = urb->status; |
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int length = urb->actual_length; |
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|
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spin_lock_irqsave(&desc->iuspin, flags); |
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clear_bit(WDM_RESPONDING, &desc->flags); |
|
|
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if (status) { |
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switch (status) { |
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case -ENOENT: |
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dev_dbg(&desc->intf->dev, |
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"nonzero urb status received: -ENOENT\n"); |
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goto skip_error; |
|
case -ECONNRESET: |
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dev_dbg(&desc->intf->dev, |
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"nonzero urb status received: -ECONNRESET\n"); |
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goto skip_error; |
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case -ESHUTDOWN: |
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dev_dbg(&desc->intf->dev, |
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"nonzero urb status received: -ESHUTDOWN\n"); |
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goto skip_error; |
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case -EPIPE: |
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dev_err(&desc->intf->dev, |
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"nonzero urb status received: -EPIPE\n"); |
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break; |
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default: |
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dev_err(&desc->intf->dev, |
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"Unexpected error %d\n", status); |
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break; |
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} |
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} |
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|
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if (test_bit(WDM_WWAN_IN_USE, &desc->flags)) { |
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wdm_wwan_rx(desc, length); |
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goto out; |
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} |
|
|
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/* |
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* only set a new error if there is no previous error. |
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* Errors are only cleared during read/open |
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* Avoid propagating -EPIPE (stall) to userspace since it is |
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* better handled as an empty read |
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*/ |
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if (desc->rerr == 0 && status != -EPIPE) |
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desc->rerr = status; |
|
|
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if (length + desc->length > desc->wMaxCommand) { |
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/* The buffer would overflow */ |
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set_bit(WDM_OVERFLOW, &desc->flags); |
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} else { |
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/* we may already be in overflow */ |
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if (!test_bit(WDM_OVERFLOW, &desc->flags)) { |
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memmove(desc->ubuf + desc->length, desc->inbuf, length); |
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desc->length += length; |
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desc->reslength = length; |
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} |
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} |
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skip_error: |
|
|
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if (desc->rerr) { |
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/* |
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* Since there was an error, userspace may decide to not read |
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* any data after poll'ing. |
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* We should respond to further attempts from the device to send |
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* data, so that we can get unstuck. |
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*/ |
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schedule_work(&desc->service_outs_intr); |
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} else { |
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set_bit(WDM_READ, &desc->flags); |
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wake_up(&desc->wait); |
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} |
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out: |
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spin_unlock_irqrestore(&desc->iuspin, flags); |
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} |
|
|
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static void wdm_int_callback(struct urb *urb) |
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{ |
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unsigned long flags; |
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int rv = 0; |
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int responding; |
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int status = urb->status; |
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struct wdm_device *desc; |
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struct usb_cdc_notification *dr; |
|
|
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desc = urb->context; |
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dr = (struct usb_cdc_notification *)desc->sbuf; |
|
|
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if (status) { |
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switch (status) { |
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case -ESHUTDOWN: |
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case -ENOENT: |
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case -ECONNRESET: |
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return; /* unplug */ |
|
case -EPIPE: |
|
set_bit(WDM_INT_STALL, &desc->flags); |
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dev_err(&desc->intf->dev, "Stall on int endpoint\n"); |
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goto sw; /* halt is cleared in work */ |
|
default: |
|
dev_err(&desc->intf->dev, |
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"nonzero urb status received: %d\n", status); |
|
break; |
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} |
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} |
|
|
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if (urb->actual_length < sizeof(struct usb_cdc_notification)) { |
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dev_err(&desc->intf->dev, "wdm_int_callback - %d bytes\n", |
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urb->actual_length); |
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goto exit; |
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} |
|
|
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switch (dr->bNotificationType) { |
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case USB_CDC_NOTIFY_RESPONSE_AVAILABLE: |
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dev_dbg(&desc->intf->dev, |
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"NOTIFY_RESPONSE_AVAILABLE received: index %d len %d\n", |
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le16_to_cpu(dr->wIndex), le16_to_cpu(dr->wLength)); |
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break; |
|
|
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case USB_CDC_NOTIFY_NETWORK_CONNECTION: |
|
|
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dev_dbg(&desc->intf->dev, |
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"NOTIFY_NETWORK_CONNECTION %s network\n", |
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dr->wValue ? "connected to" : "disconnected from"); |
|
goto exit; |
|
case USB_CDC_NOTIFY_SPEED_CHANGE: |
|
dev_dbg(&desc->intf->dev, "SPEED_CHANGE received (len %u)\n", |
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urb->actual_length); |
|
goto exit; |
|
default: |
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clear_bit(WDM_POLL_RUNNING, &desc->flags); |
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dev_err(&desc->intf->dev, |
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"unknown notification %d received: index %d len %d\n", |
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dr->bNotificationType, |
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le16_to_cpu(dr->wIndex), |
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le16_to_cpu(dr->wLength)); |
|
goto exit; |
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} |
|
|
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spin_lock_irqsave(&desc->iuspin, flags); |
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responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
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if (!desc->resp_count++ && !responding |
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&& !test_bit(WDM_DISCONNECTING, &desc->flags) |
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&& !test_bit(WDM_SUSPENDING, &desc->flags)) { |
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rv = usb_submit_urb(desc->response, GFP_ATOMIC); |
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dev_dbg(&desc->intf->dev, "submit response URB %d\n", rv); |
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} |
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spin_unlock_irqrestore(&desc->iuspin, flags); |
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if (rv < 0) { |
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clear_bit(WDM_RESPONDING, &desc->flags); |
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if (rv == -EPERM) |
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return; |
|
if (rv == -ENOMEM) { |
|
sw: |
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rv = schedule_work(&desc->rxwork); |
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if (rv) |
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dev_err(&desc->intf->dev, |
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"Cannot schedule work\n"); |
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} |
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} |
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exit: |
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rv = usb_submit_urb(urb, GFP_ATOMIC); |
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if (rv) |
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dev_err(&desc->intf->dev, |
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"%s - usb_submit_urb failed with result %d\n", |
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__func__, rv); |
|
|
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} |
|
|
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static void poison_urbs(struct wdm_device *desc) |
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{ |
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/* the order here is essential */ |
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usb_poison_urb(desc->command); |
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usb_poison_urb(desc->validity); |
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usb_poison_urb(desc->response); |
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} |
|
|
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static void unpoison_urbs(struct wdm_device *desc) |
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{ |
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/* |
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* the order here is not essential |
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* it is symmetrical just to be nice |
|
*/ |
|
usb_unpoison_urb(desc->response); |
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usb_unpoison_urb(desc->validity); |
|
usb_unpoison_urb(desc->command); |
|
} |
|
|
|
static void free_urbs(struct wdm_device *desc) |
|
{ |
|
usb_free_urb(desc->validity); |
|
usb_free_urb(desc->response); |
|
usb_free_urb(desc->command); |
|
} |
|
|
|
static void cleanup(struct wdm_device *desc) |
|
{ |
|
kfree(desc->sbuf); |
|
kfree(desc->inbuf); |
|
kfree(desc->orq); |
|
kfree(desc->irq); |
|
kfree(desc->ubuf); |
|
free_urbs(desc); |
|
kfree(desc); |
|
} |
|
|
|
static ssize_t wdm_write |
|
(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) |
|
{ |
|
u8 *buf; |
|
int rv = -EMSGSIZE, r, we; |
|
struct wdm_device *desc = file->private_data; |
|
struct usb_ctrlrequest *req; |
|
|
|
if (count > desc->wMaxCommand) |
|
count = desc->wMaxCommand; |
|
|
|
spin_lock_irq(&desc->iuspin); |
|
we = desc->werr; |
|
desc->werr = 0; |
|
spin_unlock_irq(&desc->iuspin); |
|
if (we < 0) |
|
return usb_translate_errors(we); |
|
|
|
buf = memdup_user(buffer, count); |
|
if (IS_ERR(buf)) |
|
return PTR_ERR(buf); |
|
|
|
/* concurrent writes and disconnect */ |
|
r = mutex_lock_interruptible(&desc->wlock); |
|
rv = -ERESTARTSYS; |
|
if (r) |
|
goto out_free_mem; |
|
|
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
|
rv = -ENODEV; |
|
goto out_free_mem_lock; |
|
} |
|
|
|
r = usb_autopm_get_interface(desc->intf); |
|
if (r < 0) { |
|
rv = usb_translate_errors(r); |
|
goto out_free_mem_lock; |
|
} |
|
|
|
if (!(file->f_flags & O_NONBLOCK)) |
|
r = wait_event_interruptible(desc->wait, !test_bit(WDM_IN_USE, |
|
&desc->flags)); |
|
else |
|
if (test_bit(WDM_IN_USE, &desc->flags)) |
|
r = -EAGAIN; |
|
|
|
if (test_bit(WDM_RESETTING, &desc->flags)) |
|
r = -EIO; |
|
|
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
|
r = -ENODEV; |
|
|
|
if (r < 0) { |
|
rv = r; |
|
goto out_free_mem_pm; |
|
} |
|
|
|
req = desc->orq; |
|
usb_fill_control_urb( |
|
desc->command, |
|
interface_to_usbdev(desc->intf), |
|
/* using common endpoint 0 */ |
|
usb_sndctrlpipe(interface_to_usbdev(desc->intf), 0), |
|
(unsigned char *)req, |
|
buf, |
|
count, |
|
wdm_out_callback, |
|
desc |
|
); |
|
|
|
req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | |
|
USB_RECIP_INTERFACE); |
|
req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; |
|
req->wValue = 0; |
|
req->wIndex = desc->inum; /* already converted */ |
|
req->wLength = cpu_to_le16(count); |
|
set_bit(WDM_IN_USE, &desc->flags); |
|
desc->outbuf = buf; |
|
|
|
rv = usb_submit_urb(desc->command, GFP_KERNEL); |
|
if (rv < 0) { |
|
desc->outbuf = NULL; |
|
clear_bit(WDM_IN_USE, &desc->flags); |
|
wake_up_all(&desc->wait); /* for wdm_wait_for_response() */ |
|
dev_err(&desc->intf->dev, "Tx URB error: %d\n", rv); |
|
rv = usb_translate_errors(rv); |
|
goto out_free_mem_pm; |
|
} else { |
|
dev_dbg(&desc->intf->dev, "Tx URB has been submitted index=%d\n", |
|
le16_to_cpu(req->wIndex)); |
|
} |
|
|
|
usb_autopm_put_interface(desc->intf); |
|
mutex_unlock(&desc->wlock); |
|
return count; |
|
|
|
out_free_mem_pm: |
|
usb_autopm_put_interface(desc->intf); |
|
out_free_mem_lock: |
|
mutex_unlock(&desc->wlock); |
|
out_free_mem: |
|
kfree(buf); |
|
return rv; |
|
} |
|
|
|
/* |
|
* Submit the read urb if resp_count is non-zero. |
|
* |
|
* Called with desc->iuspin locked |
|
*/ |
|
static int service_outstanding_interrupt(struct wdm_device *desc) |
|
{ |
|
int rv = 0; |
|
|
|
/* submit read urb only if the device is waiting for it */ |
|
if (!desc->resp_count || !--desc->resp_count) |
|
goto out; |
|
|
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
|
rv = -ENODEV; |
|
goto out; |
|
} |
|
if (test_bit(WDM_RESETTING, &desc->flags)) { |
|
rv = -EIO; |
|
goto out; |
|
} |
|
|
|
set_bit(WDM_RESPONDING, &desc->flags); |
|
spin_unlock_irq(&desc->iuspin); |
|
rv = usb_submit_urb(desc->response, GFP_KERNEL); |
|
spin_lock_irq(&desc->iuspin); |
|
if (rv) { |
|
if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
|
dev_err(&desc->intf->dev, |
|
"usb_submit_urb failed with result %d\n", rv); |
|
|
|
/* make sure the next notification trigger a submit */ |
|
clear_bit(WDM_RESPONDING, &desc->flags); |
|
desc->resp_count = 0; |
|
} |
|
out: |
|
return rv; |
|
} |
|
|
|
static ssize_t wdm_read |
|
(struct file *file, char __user *buffer, size_t count, loff_t *ppos) |
|
{ |
|
int rv, cntr; |
|
int i = 0; |
|
struct wdm_device *desc = file->private_data; |
|
|
|
|
|
rv = mutex_lock_interruptible(&desc->rlock); /*concurrent reads */ |
|
if (rv < 0) |
|
return -ERESTARTSYS; |
|
|
|
cntr = READ_ONCE(desc->length); |
|
if (cntr == 0) { |
|
desc->read = 0; |
|
retry: |
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
|
rv = -ENODEV; |
|
goto err; |
|
} |
|
if (test_bit(WDM_OVERFLOW, &desc->flags)) { |
|
clear_bit(WDM_OVERFLOW, &desc->flags); |
|
rv = -ENOBUFS; |
|
goto err; |
|
} |
|
i++; |
|
if (file->f_flags & O_NONBLOCK) { |
|
if (!test_bit(WDM_READ, &desc->flags)) { |
|
rv = -EAGAIN; |
|
goto err; |
|
} |
|
rv = 0; |
|
} else { |
|
rv = wait_event_interruptible(desc->wait, |
|
test_bit(WDM_READ, &desc->flags)); |
|
} |
|
|
|
/* may have happened while we slept */ |
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
|
rv = -ENODEV; |
|
goto err; |
|
} |
|
if (test_bit(WDM_RESETTING, &desc->flags)) { |
|
rv = -EIO; |
|
goto err; |
|
} |
|
usb_mark_last_busy(interface_to_usbdev(desc->intf)); |
|
if (rv < 0) { |
|
rv = -ERESTARTSYS; |
|
goto err; |
|
} |
|
|
|
spin_lock_irq(&desc->iuspin); |
|
|
|
if (desc->rerr) { /* read completed, error happened */ |
|
rv = usb_translate_errors(desc->rerr); |
|
desc->rerr = 0; |
|
spin_unlock_irq(&desc->iuspin); |
|
goto err; |
|
} |
|
/* |
|
* recheck whether we've lost the race |
|
* against the completion handler |
|
*/ |
|
if (!test_bit(WDM_READ, &desc->flags)) { /* lost race */ |
|
spin_unlock_irq(&desc->iuspin); |
|
goto retry; |
|
} |
|
|
|
if (!desc->reslength) { /* zero length read */ |
|
dev_dbg(&desc->intf->dev, "zero length - clearing WDM_READ\n"); |
|
clear_bit(WDM_READ, &desc->flags); |
|
rv = service_outstanding_interrupt(desc); |
|
spin_unlock_irq(&desc->iuspin); |
|
if (rv < 0) |
|
goto err; |
|
goto retry; |
|
} |
|
cntr = desc->length; |
|
spin_unlock_irq(&desc->iuspin); |
|
} |
|
|
|
if (cntr > count) |
|
cntr = count; |
|
rv = copy_to_user(buffer, desc->ubuf, cntr); |
|
if (rv > 0) { |
|
rv = -EFAULT; |
|
goto err; |
|
} |
|
|
|
spin_lock_irq(&desc->iuspin); |
|
|
|
for (i = 0; i < desc->length - cntr; i++) |
|
desc->ubuf[i] = desc->ubuf[i + cntr]; |
|
|
|
desc->length -= cntr; |
|
/* in case we had outstanding data */ |
|
if (!desc->length) { |
|
clear_bit(WDM_READ, &desc->flags); |
|
service_outstanding_interrupt(desc); |
|
} |
|
spin_unlock_irq(&desc->iuspin); |
|
rv = cntr; |
|
|
|
err: |
|
mutex_unlock(&desc->rlock); |
|
return rv; |
|
} |
|
|
|
static int wdm_wait_for_response(struct file *file, long timeout) |
|
{ |
|
struct wdm_device *desc = file->private_data; |
|
long rv; /* Use long here because (int) MAX_SCHEDULE_TIMEOUT < 0. */ |
|
|
|
/* |
|
* Needs both flags. We cannot do with one because resetting it would |
|
* cause a race with write() yet we need to signal a disconnect. |
|
*/ |
|
rv = wait_event_interruptible_timeout(desc->wait, |
|
!test_bit(WDM_IN_USE, &desc->flags) || |
|
test_bit(WDM_DISCONNECTING, &desc->flags), |
|
timeout); |
|
|
|
/* |
|
* To report the correct error. This is best effort. |
|
* We are inevitably racing with the hardware. |
|
*/ |
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
|
return -ENODEV; |
|
if (!rv) |
|
return -EIO; |
|
if (rv < 0) |
|
return -EINTR; |
|
|
|
spin_lock_irq(&desc->iuspin); |
|
rv = desc->werr; |
|
desc->werr = 0; |
|
spin_unlock_irq(&desc->iuspin); |
|
|
|
return usb_translate_errors(rv); |
|
|
|
} |
|
|
|
/* |
|
* You need to send a signal when you react to malicious or defective hardware. |
|
* Also, don't abort when fsync() returned -EINVAL, for older kernels which do |
|
* not implement wdm_flush() will return -EINVAL. |
|
*/ |
|
static int wdm_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
|
{ |
|
return wdm_wait_for_response(file, MAX_SCHEDULE_TIMEOUT); |
|
} |
|
|
|
/* |
|
* Same with wdm_fsync(), except it uses finite timeout in order to react to |
|
* malicious or defective hardware which ceased communication after close() was |
|
* implicitly called due to process termination. |
|
*/ |
|
static int wdm_flush(struct file *file, fl_owner_t id) |
|
{ |
|
return wdm_wait_for_response(file, WDM_FLUSH_TIMEOUT); |
|
} |
|
|
|
static __poll_t wdm_poll(struct file *file, struct poll_table_struct *wait) |
|
{ |
|
struct wdm_device *desc = file->private_data; |
|
unsigned long flags; |
|
__poll_t mask = 0; |
|
|
|
spin_lock_irqsave(&desc->iuspin, flags); |
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
|
mask = EPOLLHUP | EPOLLERR; |
|
spin_unlock_irqrestore(&desc->iuspin, flags); |
|
goto desc_out; |
|
} |
|
if (test_bit(WDM_READ, &desc->flags)) |
|
mask = EPOLLIN | EPOLLRDNORM; |
|
if (desc->rerr || desc->werr) |
|
mask |= EPOLLERR; |
|
if (!test_bit(WDM_IN_USE, &desc->flags)) |
|
mask |= EPOLLOUT | EPOLLWRNORM; |
|
spin_unlock_irqrestore(&desc->iuspin, flags); |
|
|
|
poll_wait(file, &desc->wait, wait); |
|
|
|
desc_out: |
|
return mask; |
|
} |
|
|
|
static int wdm_open(struct inode *inode, struct file *file) |
|
{ |
|
int minor = iminor(inode); |
|
int rv = -ENODEV; |
|
struct usb_interface *intf; |
|
struct wdm_device *desc; |
|
|
|
mutex_lock(&wdm_mutex); |
|
desc = wdm_find_device_by_minor(minor); |
|
if (!desc) |
|
goto out; |
|
|
|
intf = desc->intf; |
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) |
|
goto out; |
|
file->private_data = desc; |
|
|
|
if (test_bit(WDM_WWAN_IN_USE, &desc->flags)) { |
|
rv = -EBUSY; |
|
goto out; |
|
} |
|
|
|
rv = usb_autopm_get_interface(desc->intf); |
|
if (rv < 0) { |
|
dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); |
|
goto out; |
|
} |
|
|
|
/* using write lock to protect desc->count */ |
|
mutex_lock(&desc->wlock); |
|
if (!desc->count++) { |
|
desc->werr = 0; |
|
desc->rerr = 0; |
|
rv = usb_submit_urb(desc->validity, GFP_KERNEL); |
|
if (rv < 0) { |
|
desc->count--; |
|
dev_err(&desc->intf->dev, |
|
"Error submitting int urb - %d\n", rv); |
|
rv = usb_translate_errors(rv); |
|
} |
|
} else { |
|
rv = 0; |
|
} |
|
mutex_unlock(&desc->wlock); |
|
if (desc->count == 1) |
|
desc->manage_power(intf, 1); |
|
usb_autopm_put_interface(desc->intf); |
|
out: |
|
mutex_unlock(&wdm_mutex); |
|
return rv; |
|
} |
|
|
|
static int wdm_release(struct inode *inode, struct file *file) |
|
{ |
|
struct wdm_device *desc = file->private_data; |
|
|
|
mutex_lock(&wdm_mutex); |
|
|
|
/* using write lock to protect desc->count */ |
|
mutex_lock(&desc->wlock); |
|
desc->count--; |
|
mutex_unlock(&desc->wlock); |
|
|
|
if (!desc->count) { |
|
if (!test_bit(WDM_DISCONNECTING, &desc->flags)) { |
|
dev_dbg(&desc->intf->dev, "wdm_release: cleanup\n"); |
|
poison_urbs(desc); |
|
spin_lock_irq(&desc->iuspin); |
|
desc->resp_count = 0; |
|
spin_unlock_irq(&desc->iuspin); |
|
desc->manage_power(desc->intf, 0); |
|
unpoison_urbs(desc); |
|
} else { |
|
/* must avoid dev_printk here as desc->intf is invalid */ |
|
pr_debug(KBUILD_MODNAME " %s: device gone - cleaning up\n", __func__); |
|
cleanup(desc); |
|
} |
|
} |
|
mutex_unlock(&wdm_mutex); |
|
return 0; |
|
} |
|
|
|
static long wdm_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
|
{ |
|
struct wdm_device *desc = file->private_data; |
|
int rv = 0; |
|
|
|
switch (cmd) { |
|
case IOCTL_WDM_MAX_COMMAND: |
|
if (copy_to_user((void __user *)arg, &desc->wMaxCommand, sizeof(desc->wMaxCommand))) |
|
rv = -EFAULT; |
|
break; |
|
default: |
|
rv = -ENOTTY; |
|
} |
|
return rv; |
|
} |
|
|
|
static const struct file_operations wdm_fops = { |
|
.owner = THIS_MODULE, |
|
.read = wdm_read, |
|
.write = wdm_write, |
|
.fsync = wdm_fsync, |
|
.open = wdm_open, |
|
.flush = wdm_flush, |
|
.release = wdm_release, |
|
.poll = wdm_poll, |
|
.unlocked_ioctl = wdm_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.llseek = noop_llseek, |
|
}; |
|
|
|
static struct usb_class_driver wdm_class = { |
|
.name = "cdc-wdm%d", |
|
.fops = &wdm_fops, |
|
.minor_base = WDM_MINOR_BASE, |
|
}; |
|
|
|
/* --- WWAN framework integration --- */ |
|
#ifdef CONFIG_WWAN |
|
static int wdm_wwan_port_start(struct wwan_port *port) |
|
{ |
|
struct wdm_device *desc = wwan_port_get_drvdata(port); |
|
|
|
/* The interface is both exposed via the WWAN framework and as a |
|
* legacy usbmisc chardev. If chardev is already open, just fail |
|
* to prevent concurrent usage. Otherwise, switch to WWAN mode. |
|
*/ |
|
mutex_lock(&wdm_mutex); |
|
if (desc->count) { |
|
mutex_unlock(&wdm_mutex); |
|
return -EBUSY; |
|
} |
|
set_bit(WDM_WWAN_IN_USE, &desc->flags); |
|
mutex_unlock(&wdm_mutex); |
|
|
|
desc->manage_power(desc->intf, 1); |
|
|
|
/* tx is allowed */ |
|
wwan_port_txon(port); |
|
|
|
/* Start getting events */ |
|
return usb_submit_urb(desc->validity, GFP_KERNEL); |
|
} |
|
|
|
static void wdm_wwan_port_stop(struct wwan_port *port) |
|
{ |
|
struct wdm_device *desc = wwan_port_get_drvdata(port); |
|
|
|
/* Stop all transfers and disable WWAN mode */ |
|
poison_urbs(desc); |
|
desc->manage_power(desc->intf, 0); |
|
clear_bit(WDM_READ, &desc->flags); |
|
clear_bit(WDM_WWAN_IN_USE, &desc->flags); |
|
unpoison_urbs(desc); |
|
} |
|
|
|
static void wdm_wwan_port_tx_complete(struct urb *urb) |
|
{ |
|
struct sk_buff *skb = urb->context; |
|
struct wdm_device *desc = skb_shinfo(skb)->destructor_arg; |
|
|
|
usb_autopm_put_interface(desc->intf); |
|
wwan_port_txon(desc->wwanp); |
|
kfree_skb(skb); |
|
} |
|
|
|
static int wdm_wwan_port_tx(struct wwan_port *port, struct sk_buff *skb) |
|
{ |
|
struct wdm_device *desc = wwan_port_get_drvdata(port); |
|
struct usb_interface *intf = desc->intf; |
|
struct usb_ctrlrequest *req = desc->orq; |
|
int rv; |
|
|
|
rv = usb_autopm_get_interface(intf); |
|
if (rv) |
|
return rv; |
|
|
|
usb_fill_control_urb( |
|
desc->command, |
|
interface_to_usbdev(intf), |
|
usb_sndctrlpipe(interface_to_usbdev(intf), 0), |
|
(unsigned char *)req, |
|
skb->data, |
|
skb->len, |
|
wdm_wwan_port_tx_complete, |
|
skb |
|
); |
|
|
|
req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE); |
|
req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; |
|
req->wValue = 0; |
|
req->wIndex = desc->inum; |
|
req->wLength = cpu_to_le16(skb->len); |
|
|
|
skb_shinfo(skb)->destructor_arg = desc; |
|
|
|
rv = usb_submit_urb(desc->command, GFP_KERNEL); |
|
if (rv) |
|
usb_autopm_put_interface(intf); |
|
else /* One transfer at a time, stop TX until URB completion */ |
|
wwan_port_txoff(port); |
|
|
|
return rv; |
|
} |
|
|
|
static const struct wwan_port_ops wdm_wwan_port_ops = { |
|
.start = wdm_wwan_port_start, |
|
.stop = wdm_wwan_port_stop, |
|
.tx = wdm_wwan_port_tx, |
|
}; |
|
|
|
static void wdm_wwan_init(struct wdm_device *desc) |
|
{ |
|
struct usb_interface *intf = desc->intf; |
|
struct wwan_port *port; |
|
|
|
/* Only register to WWAN core if protocol/type is known */ |
|
if (desc->wwanp_type == WWAN_PORT_UNKNOWN) { |
|
dev_info(&intf->dev, "Unknown control protocol\n"); |
|
return; |
|
} |
|
|
|
port = wwan_create_port(&intf->dev, desc->wwanp_type, &wdm_wwan_port_ops, desc); |
|
if (IS_ERR(port)) { |
|
dev_err(&intf->dev, "%s: Unable to create WWAN port\n", |
|
dev_name(intf->usb_dev)); |
|
return; |
|
} |
|
|
|
desc->wwanp = port; |
|
} |
|
|
|
static void wdm_wwan_deinit(struct wdm_device *desc) |
|
{ |
|
if (!desc->wwanp) |
|
return; |
|
|
|
wwan_remove_port(desc->wwanp); |
|
desc->wwanp = NULL; |
|
} |
|
|
|
static void wdm_wwan_rx(struct wdm_device *desc, int length) |
|
{ |
|
struct wwan_port *port = desc->wwanp; |
|
struct sk_buff *skb; |
|
|
|
/* Forward data to WWAN port */ |
|
skb = alloc_skb(length, GFP_ATOMIC); |
|
if (!skb) |
|
return; |
|
|
|
memcpy(skb_put(skb, length), desc->inbuf, length); |
|
wwan_port_rx(port, skb); |
|
|
|
/* inbuf has been copied, it is safe to check for outstanding data */ |
|
schedule_work(&desc->service_outs_intr); |
|
} |
|
#else /* CONFIG_WWAN */ |
|
static void wdm_wwan_init(struct wdm_device *desc) {} |
|
static void wdm_wwan_deinit(struct wdm_device *desc) {} |
|
static void wdm_wwan_rx(struct wdm_device *desc, int length) {} |
|
#endif /* CONFIG_WWAN */ |
|
|
|
/* --- error handling --- */ |
|
static void wdm_rxwork(struct work_struct *work) |
|
{ |
|
struct wdm_device *desc = container_of(work, struct wdm_device, rxwork); |
|
unsigned long flags; |
|
int rv = 0; |
|
int responding; |
|
|
|
spin_lock_irqsave(&desc->iuspin, flags); |
|
if (test_bit(WDM_DISCONNECTING, &desc->flags)) { |
|
spin_unlock_irqrestore(&desc->iuspin, flags); |
|
} else { |
|
responding = test_and_set_bit(WDM_RESPONDING, &desc->flags); |
|
spin_unlock_irqrestore(&desc->iuspin, flags); |
|
if (!responding) |
|
rv = usb_submit_urb(desc->response, GFP_KERNEL); |
|
if (rv < 0 && rv != -EPERM) { |
|
spin_lock_irqsave(&desc->iuspin, flags); |
|
clear_bit(WDM_RESPONDING, &desc->flags); |
|
if (!test_bit(WDM_DISCONNECTING, &desc->flags)) |
|
schedule_work(&desc->rxwork); |
|
spin_unlock_irqrestore(&desc->iuspin, flags); |
|
} |
|
} |
|
} |
|
|
|
static void service_interrupt_work(struct work_struct *work) |
|
{ |
|
struct wdm_device *desc; |
|
|
|
desc = container_of(work, struct wdm_device, service_outs_intr); |
|
|
|
spin_lock_irq(&desc->iuspin); |
|
service_outstanding_interrupt(desc); |
|
if (!desc->resp_count) { |
|
set_bit(WDM_READ, &desc->flags); |
|
wake_up(&desc->wait); |
|
} |
|
spin_unlock_irq(&desc->iuspin); |
|
} |
|
|
|
/* --- hotplug --- */ |
|
|
|
static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, |
|
u16 bufsize, enum wwan_port_type type, |
|
int (*manage_power)(struct usb_interface *, int)) |
|
{ |
|
int rv = -ENOMEM; |
|
struct wdm_device *desc; |
|
|
|
desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); |
|
if (!desc) |
|
goto out; |
|
INIT_LIST_HEAD(&desc->device_list); |
|
mutex_init(&desc->rlock); |
|
mutex_init(&desc->wlock); |
|
spin_lock_init(&desc->iuspin); |
|
init_waitqueue_head(&desc->wait); |
|
desc->wMaxCommand = bufsize; |
|
/* this will be expanded and needed in hardware endianness */ |
|
desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); |
|
desc->intf = intf; |
|
desc->wwanp_type = type; |
|
INIT_WORK(&desc->rxwork, wdm_rxwork); |
|
INIT_WORK(&desc->service_outs_intr, service_interrupt_work); |
|
|
|
if (!usb_endpoint_is_int_in(ep)) { |
|
rv = -EINVAL; |
|
goto err; |
|
} |
|
|
|
desc->wMaxPacketSize = usb_endpoint_maxp(ep); |
|
|
|
desc->orq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); |
|
if (!desc->orq) |
|
goto err; |
|
desc->irq = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); |
|
if (!desc->irq) |
|
goto err; |
|
|
|
desc->validity = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!desc->validity) |
|
goto err; |
|
|
|
desc->response = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!desc->response) |
|
goto err; |
|
|
|
desc->command = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!desc->command) |
|
goto err; |
|
|
|
desc->ubuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); |
|
if (!desc->ubuf) |
|
goto err; |
|
|
|
desc->sbuf = kmalloc(desc->wMaxPacketSize, GFP_KERNEL); |
|
if (!desc->sbuf) |
|
goto err; |
|
|
|
desc->inbuf = kmalloc(desc->wMaxCommand, GFP_KERNEL); |
|
if (!desc->inbuf) |
|
goto err; |
|
|
|
usb_fill_int_urb( |
|
desc->validity, |
|
interface_to_usbdev(intf), |
|
usb_rcvintpipe(interface_to_usbdev(intf), ep->bEndpointAddress), |
|
desc->sbuf, |
|
desc->wMaxPacketSize, |
|
wdm_int_callback, |
|
desc, |
|
ep->bInterval |
|
); |
|
|
|
desc->irq->bRequestType = (USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE); |
|
desc->irq->bRequest = USB_CDC_GET_ENCAPSULATED_RESPONSE; |
|
desc->irq->wValue = 0; |
|
desc->irq->wIndex = desc->inum; /* already converted */ |
|
desc->irq->wLength = cpu_to_le16(desc->wMaxCommand); |
|
|
|
usb_fill_control_urb( |
|
desc->response, |
|
interface_to_usbdev(intf), |
|
/* using common endpoint 0 */ |
|
usb_rcvctrlpipe(interface_to_usbdev(desc->intf), 0), |
|
(unsigned char *)desc->irq, |
|
desc->inbuf, |
|
desc->wMaxCommand, |
|
wdm_in_callback, |
|
desc |
|
); |
|
|
|
desc->manage_power = manage_power; |
|
|
|
spin_lock(&wdm_device_list_lock); |
|
list_add(&desc->device_list, &wdm_device_list); |
|
spin_unlock(&wdm_device_list_lock); |
|
|
|
rv = usb_register_dev(intf, &wdm_class); |
|
if (rv < 0) |
|
goto err; |
|
else |
|
dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev)); |
|
|
|
wdm_wwan_init(desc); |
|
|
|
out: |
|
return rv; |
|
err: |
|
spin_lock(&wdm_device_list_lock); |
|
list_del(&desc->device_list); |
|
spin_unlock(&wdm_device_list_lock); |
|
cleanup(desc); |
|
return rv; |
|
} |
|
|
|
static int wdm_manage_power(struct usb_interface *intf, int on) |
|
{ |
|
/* need autopm_get/put here to ensure the usbcore sees the new value */ |
|
int rv = usb_autopm_get_interface(intf); |
|
|
|
intf->needs_remote_wakeup = on; |
|
if (!rv) |
|
usb_autopm_put_interface(intf); |
|
return 0; |
|
} |
|
|
|
static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) |
|
{ |
|
int rv = -EINVAL; |
|
struct usb_host_interface *iface; |
|
struct usb_endpoint_descriptor *ep; |
|
struct usb_cdc_parsed_header hdr; |
|
u8 *buffer = intf->altsetting->extra; |
|
int buflen = intf->altsetting->extralen; |
|
u16 maxcom = WDM_DEFAULT_BUFSIZE; |
|
|
|
if (!buffer) |
|
goto err; |
|
|
|
cdc_parse_cdc_header(&hdr, intf, buffer, buflen); |
|
|
|
if (hdr.usb_cdc_dmm_desc) |
|
maxcom = le16_to_cpu(hdr.usb_cdc_dmm_desc->wMaxCommand); |
|
|
|
iface = intf->cur_altsetting; |
|
if (iface->desc.bNumEndpoints != 1) |
|
goto err; |
|
ep = &iface->endpoint[0].desc; |
|
|
|
rv = wdm_create(intf, ep, maxcom, WWAN_PORT_UNKNOWN, &wdm_manage_power); |
|
|
|
err: |
|
return rv; |
|
} |
|
|
|
/** |
|
* usb_cdc_wdm_register - register a WDM subdriver |
|
* @intf: usb interface the subdriver will associate with |
|
* @ep: interrupt endpoint to monitor for notifications |
|
* @bufsize: maximum message size to support for read/write |
|
* @type: Type/protocol of the transported data (MBIM, QMI...) |
|
* @manage_power: call-back invoked during open and release to |
|
* manage the device's power |
|
* Create WDM usb class character device and associate it with intf |
|
* without binding, allowing another driver to manage the interface. |
|
* |
|
* The subdriver will manage the given interrupt endpoint exclusively |
|
* and will issue control requests referring to the given intf. It |
|
* will otherwise avoid interferring, and in particular not do |
|
* usb_set_intfdata/usb_get_intfdata on intf. |
|
* |
|
* The return value is a pointer to the subdriver's struct usb_driver. |
|
* The registering driver is responsible for calling this subdriver's |
|
* disconnect, suspend, resume, pre_reset and post_reset methods from |
|
* its own. |
|
*/ |
|
struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, |
|
struct usb_endpoint_descriptor *ep, |
|
int bufsize, enum wwan_port_type type, |
|
int (*manage_power)(struct usb_interface *, int)) |
|
{ |
|
int rv; |
|
|
|
rv = wdm_create(intf, ep, bufsize, type, manage_power); |
|
if (rv < 0) |
|
goto err; |
|
|
|
return &wdm_driver; |
|
err: |
|
return ERR_PTR(rv); |
|
} |
|
EXPORT_SYMBOL(usb_cdc_wdm_register); |
|
|
|
static void wdm_disconnect(struct usb_interface *intf) |
|
{ |
|
struct wdm_device *desc; |
|
unsigned long flags; |
|
|
|
usb_deregister_dev(intf, &wdm_class); |
|
desc = wdm_find_device(intf); |
|
mutex_lock(&wdm_mutex); |
|
|
|
wdm_wwan_deinit(desc); |
|
|
|
/* the spinlock makes sure no new urbs are generated in the callbacks */ |
|
spin_lock_irqsave(&desc->iuspin, flags); |
|
set_bit(WDM_DISCONNECTING, &desc->flags); |
|
set_bit(WDM_READ, &desc->flags); |
|
spin_unlock_irqrestore(&desc->iuspin, flags); |
|
wake_up_all(&desc->wait); |
|
mutex_lock(&desc->rlock); |
|
mutex_lock(&desc->wlock); |
|
poison_urbs(desc); |
|
cancel_work_sync(&desc->rxwork); |
|
cancel_work_sync(&desc->service_outs_intr); |
|
mutex_unlock(&desc->wlock); |
|
mutex_unlock(&desc->rlock); |
|
|
|
/* the desc->intf pointer used as list key is now invalid */ |
|
spin_lock(&wdm_device_list_lock); |
|
list_del(&desc->device_list); |
|
spin_unlock(&wdm_device_list_lock); |
|
|
|
if (!desc->count) |
|
cleanup(desc); |
|
else |
|
dev_dbg(&intf->dev, "%d open files - postponing cleanup\n", desc->count); |
|
mutex_unlock(&wdm_mutex); |
|
} |
|
|
|
#ifdef CONFIG_PM |
|
static int wdm_suspend(struct usb_interface *intf, pm_message_t message) |
|
{ |
|
struct wdm_device *desc = wdm_find_device(intf); |
|
int rv = 0; |
|
|
|
dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); |
|
|
|
/* if this is an autosuspend the caller does the locking */ |
|
if (!PMSG_IS_AUTO(message)) { |
|
mutex_lock(&desc->rlock); |
|
mutex_lock(&desc->wlock); |
|
} |
|
spin_lock_irq(&desc->iuspin); |
|
|
|
if (PMSG_IS_AUTO(message) && |
|
(test_bit(WDM_IN_USE, &desc->flags) |
|
|| test_bit(WDM_RESPONDING, &desc->flags))) { |
|
spin_unlock_irq(&desc->iuspin); |
|
rv = -EBUSY; |
|
} else { |
|
|
|
set_bit(WDM_SUSPENDING, &desc->flags); |
|
spin_unlock_irq(&desc->iuspin); |
|
/* callback submits work - order is essential */ |
|
poison_urbs(desc); |
|
cancel_work_sync(&desc->rxwork); |
|
cancel_work_sync(&desc->service_outs_intr); |
|
unpoison_urbs(desc); |
|
} |
|
if (!PMSG_IS_AUTO(message)) { |
|
mutex_unlock(&desc->wlock); |
|
mutex_unlock(&desc->rlock); |
|
} |
|
|
|
return rv; |
|
} |
|
#endif |
|
|
|
static int recover_from_urb_loss(struct wdm_device *desc) |
|
{ |
|
int rv = 0; |
|
|
|
if (desc->count) { |
|
rv = usb_submit_urb(desc->validity, GFP_NOIO); |
|
if (rv < 0) |
|
dev_err(&desc->intf->dev, |
|
"Error resume submitting int urb - %d\n", rv); |
|
} |
|
return rv; |
|
} |
|
|
|
#ifdef CONFIG_PM |
|
static int wdm_resume(struct usb_interface *intf) |
|
{ |
|
struct wdm_device *desc = wdm_find_device(intf); |
|
int rv; |
|
|
|
dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); |
|
|
|
clear_bit(WDM_SUSPENDING, &desc->flags); |
|
rv = recover_from_urb_loss(desc); |
|
|
|
return rv; |
|
} |
|
#endif |
|
|
|
static int wdm_pre_reset(struct usb_interface *intf) |
|
{ |
|
struct wdm_device *desc = wdm_find_device(intf); |
|
|
|
/* |
|
* we notify everybody using poll of |
|
* an exceptional situation |
|
* must be done before recovery lest a spontaneous |
|
* message from the device is lost |
|
*/ |
|
spin_lock_irq(&desc->iuspin); |
|
set_bit(WDM_RESETTING, &desc->flags); /* inform read/write */ |
|
set_bit(WDM_READ, &desc->flags); /* unblock read */ |
|
clear_bit(WDM_IN_USE, &desc->flags); /* unblock write */ |
|
desc->rerr = -EINTR; |
|
spin_unlock_irq(&desc->iuspin); |
|
wake_up_all(&desc->wait); |
|
mutex_lock(&desc->rlock); |
|
mutex_lock(&desc->wlock); |
|
poison_urbs(desc); |
|
cancel_work_sync(&desc->rxwork); |
|
cancel_work_sync(&desc->service_outs_intr); |
|
return 0; |
|
} |
|
|
|
static int wdm_post_reset(struct usb_interface *intf) |
|
{ |
|
struct wdm_device *desc = wdm_find_device(intf); |
|
int rv; |
|
|
|
unpoison_urbs(desc); |
|
clear_bit(WDM_OVERFLOW, &desc->flags); |
|
clear_bit(WDM_RESETTING, &desc->flags); |
|
rv = recover_from_urb_loss(desc); |
|
mutex_unlock(&desc->wlock); |
|
mutex_unlock(&desc->rlock); |
|
return rv; |
|
} |
|
|
|
static struct usb_driver wdm_driver = { |
|
.name = "cdc_wdm", |
|
.probe = wdm_probe, |
|
.disconnect = wdm_disconnect, |
|
#ifdef CONFIG_PM |
|
.suspend = wdm_suspend, |
|
.resume = wdm_resume, |
|
.reset_resume = wdm_resume, |
|
#endif |
|
.pre_reset = wdm_pre_reset, |
|
.post_reset = wdm_post_reset, |
|
.id_table = wdm_ids, |
|
.supports_autosuspend = 1, |
|
.disable_hub_initiated_lpm = 1, |
|
}; |
|
|
|
module_usb_driver(wdm_driver); |
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR); |
|
MODULE_DESCRIPTION(DRIVER_DESC); |
|
MODULE_LICENSE("GPL");
|
|
|