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2044 lines
78 KiB
2044 lines
78 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __LINUX_USB_H |
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#define __LINUX_USB_H |
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#include <linux/mod_devicetable.h> |
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#include <linux/usb/ch9.h> |
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|
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#define USB_MAJOR 180 |
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#define USB_DEVICE_MAJOR 189 |
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#ifdef __KERNEL__ |
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#include <linux/errno.h> /* for -ENODEV */ |
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#include <linux/delay.h> /* for mdelay() */ |
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#include <linux/interrupt.h> /* for in_interrupt() */ |
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#include <linux/list.h> /* for struct list_head */ |
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#include <linux/kref.h> /* for struct kref */ |
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#include <linux/device.h> /* for struct device */ |
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#include <linux/fs.h> /* for struct file_operations */ |
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#include <linux/completion.h> /* for struct completion */ |
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#include <linux/sched.h> /* for current && schedule_timeout */ |
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#include <linux/mutex.h> /* for struct mutex */ |
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#include <linux/pm_runtime.h> /* for runtime PM */ |
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struct usb_device; |
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struct usb_driver; |
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struct wusb_dev; |
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/*-------------------------------------------------------------------------*/ |
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|
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/* |
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* Host-side wrappers for standard USB descriptors ... these are parsed |
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* from the data provided by devices. Parsing turns them from a flat |
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* sequence of descriptors into a hierarchy: |
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* |
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* - devices have one (usually) or more configs; |
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* - configs have one (often) or more interfaces; |
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* - interfaces have one (usually) or more settings; |
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* - each interface setting has zero or (usually) more endpoints. |
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* - a SuperSpeed endpoint has a companion descriptor |
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* |
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* And there might be other descriptors mixed in with those. |
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* |
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* Devices may also have class-specific or vendor-specific descriptors. |
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*/ |
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struct ep_device; |
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/** |
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* struct usb_host_endpoint - host-side endpoint descriptor and queue |
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* @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder |
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* @ss_ep_comp: SuperSpeed companion descriptor for this endpoint |
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* @ssp_isoc_ep_comp: SuperSpeedPlus isoc companion descriptor for this endpoint |
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* @urb_list: urbs queued to this endpoint; maintained by usbcore |
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* @hcpriv: for use by HCD; typically holds hardware dma queue head (QH) |
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* with one or more transfer descriptors (TDs) per urb |
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* @ep_dev: ep_device for sysfs info |
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* @extra: descriptors following this endpoint in the configuration |
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* @extralen: how many bytes of "extra" are valid |
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* @enabled: URBs may be submitted to this endpoint |
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* @streams: number of USB-3 streams allocated on the endpoint |
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* |
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* USB requests are always queued to a given endpoint, identified by a |
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* descriptor within an active interface in a given USB configuration. |
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*/ |
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struct usb_host_endpoint { |
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struct usb_endpoint_descriptor desc; |
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struct usb_ss_ep_comp_descriptor ss_ep_comp; |
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struct usb_ssp_isoc_ep_comp_descriptor ssp_isoc_ep_comp; |
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struct list_head urb_list; |
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void *hcpriv; |
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struct ep_device *ep_dev; /* For sysfs info */ |
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unsigned char *extra; /* Extra descriptors */ |
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int extralen; |
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int enabled; |
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int streams; |
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}; |
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/* host-side wrapper for one interface setting's parsed descriptors */ |
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struct usb_host_interface { |
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struct usb_interface_descriptor desc; |
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int extralen; |
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unsigned char *extra; /* Extra descriptors */ |
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|
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/* array of desc.bNumEndpoints endpoints associated with this |
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* interface setting. these will be in no particular order. |
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*/ |
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struct usb_host_endpoint *endpoint; |
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|
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char *string; /* iInterface string, if present */ |
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}; |
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enum usb_interface_condition { |
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USB_INTERFACE_UNBOUND = 0, |
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USB_INTERFACE_BINDING, |
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USB_INTERFACE_BOUND, |
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USB_INTERFACE_UNBINDING, |
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}; |
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int __must_check |
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usb_find_common_endpoints(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **bulk_in, |
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struct usb_endpoint_descriptor **bulk_out, |
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struct usb_endpoint_descriptor **int_in, |
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struct usb_endpoint_descriptor **int_out); |
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int __must_check |
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usb_find_common_endpoints_reverse(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **bulk_in, |
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struct usb_endpoint_descriptor **bulk_out, |
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struct usb_endpoint_descriptor **int_in, |
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struct usb_endpoint_descriptor **int_out); |
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static inline int __must_check |
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usb_find_bulk_in_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **bulk_in) |
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{ |
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return usb_find_common_endpoints(alt, bulk_in, NULL, NULL, NULL); |
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} |
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static inline int __must_check |
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usb_find_bulk_out_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **bulk_out) |
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{ |
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return usb_find_common_endpoints(alt, NULL, bulk_out, NULL, NULL); |
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} |
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static inline int __must_check |
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usb_find_int_in_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **int_in) |
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{ |
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return usb_find_common_endpoints(alt, NULL, NULL, int_in, NULL); |
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} |
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static inline int __must_check |
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usb_find_int_out_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **int_out) |
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{ |
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return usb_find_common_endpoints(alt, NULL, NULL, NULL, int_out); |
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} |
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static inline int __must_check |
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usb_find_last_bulk_in_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **bulk_in) |
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{ |
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return usb_find_common_endpoints_reverse(alt, bulk_in, NULL, NULL, NULL); |
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} |
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static inline int __must_check |
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usb_find_last_bulk_out_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **bulk_out) |
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{ |
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return usb_find_common_endpoints_reverse(alt, NULL, bulk_out, NULL, NULL); |
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} |
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static inline int __must_check |
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usb_find_last_int_in_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **int_in) |
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{ |
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return usb_find_common_endpoints_reverse(alt, NULL, NULL, int_in, NULL); |
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} |
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static inline int __must_check |
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usb_find_last_int_out_endpoint(struct usb_host_interface *alt, |
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struct usb_endpoint_descriptor **int_out) |
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{ |
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return usb_find_common_endpoints_reverse(alt, NULL, NULL, NULL, int_out); |
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} |
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/** |
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* struct usb_interface - what usb device drivers talk to |
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* @altsetting: array of interface structures, one for each alternate |
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* setting that may be selected. Each one includes a set of |
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* endpoint configurations. They will be in no particular order. |
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* @cur_altsetting: the current altsetting. |
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* @num_altsetting: number of altsettings defined. |
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* @intf_assoc: interface association descriptor |
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* @minor: the minor number assigned to this interface, if this |
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* interface is bound to a driver that uses the USB major number. |
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* If this interface does not use the USB major, this field should |
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* be unused. The driver should set this value in the probe() |
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* function of the driver, after it has been assigned a minor |
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* number from the USB core by calling usb_register_dev(). |
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* @condition: binding state of the interface: not bound, binding |
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* (in probe()), bound to a driver, or unbinding (in disconnect()) |
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* @sysfs_files_created: sysfs attributes exist |
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* @ep_devs_created: endpoint child pseudo-devices exist |
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* @unregistering: flag set when the interface is being unregistered |
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* @needs_remote_wakeup: flag set when the driver requires remote-wakeup |
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* capability during autosuspend. |
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* @needs_altsetting0: flag set when a set-interface request for altsetting 0 |
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* has been deferred. |
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* @needs_binding: flag set when the driver should be re-probed or unbound |
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* following a reset or suspend operation it doesn't support. |
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* @authorized: This allows to (de)authorize individual interfaces instead |
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* a whole device in contrast to the device authorization. |
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* @dev: driver model's view of this device |
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* @usb_dev: if an interface is bound to the USB major, this will point |
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* to the sysfs representation for that device. |
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* @reset_ws: Used for scheduling resets from atomic context. |
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* @resetting_device: USB core reset the device, so use alt setting 0 as |
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* current; needs bandwidth alloc after reset. |
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* |
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* USB device drivers attach to interfaces on a physical device. Each |
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* interface encapsulates a single high level function, such as feeding |
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* an audio stream to a speaker or reporting a change in a volume control. |
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* Many USB devices only have one interface. The protocol used to talk to |
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* an interface's endpoints can be defined in a usb "class" specification, |
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* or by a product's vendor. The (default) control endpoint is part of |
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* every interface, but is never listed among the interface's descriptors. |
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* |
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* The driver that is bound to the interface can use standard driver model |
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* calls such as dev_get_drvdata() on the dev member of this structure. |
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* |
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* Each interface may have alternate settings. The initial configuration |
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* of a device sets altsetting 0, but the device driver can change |
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* that setting using usb_set_interface(). Alternate settings are often |
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* used to control the use of periodic endpoints, such as by having |
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* different endpoints use different amounts of reserved USB bandwidth. |
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* All standards-conformant USB devices that use isochronous endpoints |
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* will use them in non-default settings. |
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* |
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* The USB specification says that alternate setting numbers must run from |
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* 0 to one less than the total number of alternate settings. But some |
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* devices manage to mess this up, and the structures aren't necessarily |
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* stored in numerical order anyhow. Use usb_altnum_to_altsetting() to |
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* look up an alternate setting in the altsetting array based on its number. |
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*/ |
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struct usb_interface { |
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/* array of alternate settings for this interface, |
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* stored in no particular order */ |
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struct usb_host_interface *altsetting; |
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struct usb_host_interface *cur_altsetting; /* the currently |
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* active alternate setting */ |
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unsigned num_altsetting; /* number of alternate settings */ |
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/* If there is an interface association descriptor then it will list |
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* the associated interfaces */ |
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struct usb_interface_assoc_descriptor *intf_assoc; |
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int minor; /* minor number this interface is |
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* bound to */ |
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enum usb_interface_condition condition; /* state of binding */ |
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unsigned sysfs_files_created:1; /* the sysfs attributes exist */ |
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unsigned ep_devs_created:1; /* endpoint "devices" exist */ |
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unsigned unregistering:1; /* unregistration is in progress */ |
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unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */ |
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unsigned needs_altsetting0:1; /* switch to altsetting 0 is pending */ |
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unsigned needs_binding:1; /* needs delayed unbind/rebind */ |
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unsigned resetting_device:1; /* true: bandwidth alloc after reset */ |
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unsigned authorized:1; /* used for interface authorization */ |
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struct device dev; /* interface specific device info */ |
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struct device *usb_dev; |
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struct work_struct reset_ws; /* for resets in atomic context */ |
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}; |
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#define to_usb_interface(d) container_of(d, struct usb_interface, dev) |
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static inline void *usb_get_intfdata(struct usb_interface *intf) |
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{ |
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return dev_get_drvdata(&intf->dev); |
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} |
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static inline void usb_set_intfdata(struct usb_interface *intf, void *data) |
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{ |
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dev_set_drvdata(&intf->dev, data); |
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} |
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struct usb_interface *usb_get_intf(struct usb_interface *intf); |
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void usb_put_intf(struct usb_interface *intf); |
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/* Hard limit */ |
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#define USB_MAXENDPOINTS 30 |
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/* this maximum is arbitrary */ |
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#define USB_MAXINTERFACES 32 |
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#define USB_MAXIADS (USB_MAXINTERFACES/2) |
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/* |
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* USB Resume Timer: Every Host controller driver should drive the resume |
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* signalling on the bus for the amount of time defined by this macro. |
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* |
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* That way we will have a 'stable' behavior among all HCDs supported by Linux. |
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* |
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* Note that the USB Specification states we should drive resume for *at least* |
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* 20 ms, but it doesn't give an upper bound. This creates two possible |
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* situations which we want to avoid: |
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* |
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* (a) sometimes an msleep(20) might expire slightly before 20 ms, which causes |
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* us to fail USB Electrical Tests, thus failing Certification |
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* |
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* (b) Some (many) devices actually need more than 20 ms of resume signalling, |
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* and while we can argue that's against the USB Specification, we don't have |
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* control over which devices a certification laboratory will be using for |
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* certification. If CertLab uses a device which was tested against Windows and |
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* that happens to have relaxed resume signalling rules, we might fall into |
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* situations where we fail interoperability and electrical tests. |
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* |
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* In order to avoid both conditions, we're using a 40 ms resume timeout, which |
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* should cope with both LPJ calibration errors and devices not following every |
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* detail of the USB Specification. |
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*/ |
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#define USB_RESUME_TIMEOUT 40 /* ms */ |
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/** |
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* struct usb_interface_cache - long-term representation of a device interface |
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* @num_altsetting: number of altsettings defined. |
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* @ref: reference counter. |
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* @altsetting: variable-length array of interface structures, one for |
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* each alternate setting that may be selected. Each one includes a |
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* set of endpoint configurations. They will be in no particular order. |
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* |
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* These structures persist for the lifetime of a usb_device, unlike |
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* struct usb_interface (which persists only as long as its configuration |
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* is installed). The altsetting arrays can be accessed through these |
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* structures at any time, permitting comparison of configurations and |
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* providing support for the /sys/kernel/debug/usb/devices pseudo-file. |
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*/ |
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struct usb_interface_cache { |
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unsigned num_altsetting; /* number of alternate settings */ |
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struct kref ref; /* reference counter */ |
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|
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/* variable-length array of alternate settings for this interface, |
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* stored in no particular order */ |
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struct usb_host_interface altsetting[]; |
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}; |
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#define ref_to_usb_interface_cache(r) \ |
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container_of(r, struct usb_interface_cache, ref) |
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#define altsetting_to_usb_interface_cache(a) \ |
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container_of(a, struct usb_interface_cache, altsetting[0]) |
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/** |
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* struct usb_host_config - representation of a device's configuration |
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* @desc: the device's configuration descriptor. |
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* @string: pointer to the cached version of the iConfiguration string, if |
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* present for this configuration. |
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* @intf_assoc: list of any interface association descriptors in this config |
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* @interface: array of pointers to usb_interface structures, one for each |
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* interface in the configuration. The number of interfaces is stored |
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* in desc.bNumInterfaces. These pointers are valid only while the |
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* configuration is active. |
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* @intf_cache: array of pointers to usb_interface_cache structures, one |
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* for each interface in the configuration. These structures exist |
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* for the entire life of the device. |
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* @extra: pointer to buffer containing all extra descriptors associated |
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* with this configuration (those preceding the first interface |
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* descriptor). |
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* @extralen: length of the extra descriptors buffer. |
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* |
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* USB devices may have multiple configurations, but only one can be active |
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* at any time. Each encapsulates a different operational environment; |
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* for example, a dual-speed device would have separate configurations for |
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* full-speed and high-speed operation. The number of configurations |
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* available is stored in the device descriptor as bNumConfigurations. |
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* |
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* A configuration can contain multiple interfaces. Each corresponds to |
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* a different function of the USB device, and all are available whenever |
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* the configuration is active. The USB standard says that interfaces |
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* are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot |
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* of devices get this wrong. In addition, the interface array is not |
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* guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to |
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* look up an interface entry based on its number. |
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* |
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* Device drivers should not attempt to activate configurations. The choice |
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* of which configuration to install is a policy decision based on such |
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* considerations as available power, functionality provided, and the user's |
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* desires (expressed through userspace tools). However, drivers can call |
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* usb_reset_configuration() to reinitialize the current configuration and |
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* all its interfaces. |
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*/ |
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struct usb_host_config { |
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struct usb_config_descriptor desc; |
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char *string; /* iConfiguration string, if present */ |
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/* List of any Interface Association Descriptors in this |
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* configuration. */ |
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struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS]; |
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/* the interfaces associated with this configuration, |
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* stored in no particular order */ |
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struct usb_interface *interface[USB_MAXINTERFACES]; |
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/* Interface information available even when this is not the |
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* active configuration */ |
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struct usb_interface_cache *intf_cache[USB_MAXINTERFACES]; |
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unsigned char *extra; /* Extra descriptors */ |
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int extralen; |
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}; |
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/* USB2.0 and USB3.0 device BOS descriptor set */ |
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struct usb_host_bos { |
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struct usb_bos_descriptor *desc; |
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/* wireless cap descriptor is handled by wusb */ |
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struct usb_ext_cap_descriptor *ext_cap; |
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struct usb_ss_cap_descriptor *ss_cap; |
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struct usb_ssp_cap_descriptor *ssp_cap; |
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struct usb_ss_container_id_descriptor *ss_id; |
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struct usb_ptm_cap_descriptor *ptm_cap; |
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}; |
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int __usb_get_extra_descriptor(char *buffer, unsigned size, |
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unsigned char type, void **ptr, size_t min); |
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#define usb_get_extra_descriptor(ifpoint, type, ptr) \ |
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__usb_get_extra_descriptor((ifpoint)->extra, \ |
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(ifpoint)->extralen, \ |
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type, (void **)ptr, sizeof(**(ptr))) |
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/* ----------------------------------------------------------------------- */ |
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|
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/* USB device number allocation bitmap */ |
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struct usb_devmap { |
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unsigned long devicemap[128 / (8*sizeof(unsigned long))]; |
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}; |
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|
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/* |
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* Allocated per bus (tree of devices) we have: |
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*/ |
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struct usb_bus { |
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struct device *controller; /* host side hardware */ |
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struct device *sysdev; /* as seen from firmware or bus */ |
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int busnum; /* Bus number (in order of reg) */ |
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const char *bus_name; /* stable id (PCI slot_name etc) */ |
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u8 uses_pio_for_control; /* |
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* Does the host controller use PIO |
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* for control transfers? |
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*/ |
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u8 otg_port; /* 0, or number of OTG/HNP port */ |
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unsigned is_b_host:1; /* true during some HNP roleswitches */ |
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unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */ |
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unsigned no_stop_on_short:1; /* |
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* Quirk: some controllers don't stop |
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* the ep queue on a short transfer |
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* with the URB_SHORT_NOT_OK flag set. |
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*/ |
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unsigned no_sg_constraint:1; /* no sg constraint */ |
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unsigned sg_tablesize; /* 0 or largest number of sg list entries */ |
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|
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int devnum_next; /* Next open device number in |
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* round-robin allocation */ |
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struct mutex devnum_next_mutex; /* devnum_next mutex */ |
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|
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struct usb_devmap devmap; /* device address allocation map */ |
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struct usb_device *root_hub; /* Root hub */ |
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struct usb_bus *hs_companion; /* Companion EHCI bus, if any */ |
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|
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int bandwidth_allocated; /* on this bus: how much of the time |
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* reserved for periodic (intr/iso) |
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* requests is used, on average? |
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* Units: microseconds/frame. |
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* Limits: Full/low speed reserve 90%, |
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* while high speed reserves 80%. |
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*/ |
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int bandwidth_int_reqs; /* number of Interrupt requests */ |
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int bandwidth_isoc_reqs; /* number of Isoc. requests */ |
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|
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unsigned resuming_ports; /* bit array: resuming root-hub ports */ |
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|
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#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE) |
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struct mon_bus *mon_bus; /* non-null when associated */ |
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int monitored; /* non-zero when monitored */ |
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#endif |
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}; |
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|
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struct usb_dev_state; |
|
|
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/* ----------------------------------------------------------------------- */ |
|
|
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struct usb_tt; |
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|
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enum usb_device_removable { |
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USB_DEVICE_REMOVABLE_UNKNOWN = 0, |
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USB_DEVICE_REMOVABLE, |
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USB_DEVICE_FIXED, |
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}; |
|
|
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enum usb_port_connect_type { |
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USB_PORT_CONNECT_TYPE_UNKNOWN = 0, |
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USB_PORT_CONNECT_TYPE_HOT_PLUG, |
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USB_PORT_CONNECT_TYPE_HARD_WIRED, |
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USB_PORT_NOT_USED, |
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}; |
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|
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/* |
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* USB port quirks. |
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*/ |
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|
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/* For the given port, prefer the old (faster) enumeration scheme. */ |
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#define USB_PORT_QUIRK_OLD_SCHEME BIT(0) |
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|
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/* Decrease TRSTRCY to 10ms during device enumeration. */ |
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#define USB_PORT_QUIRK_FAST_ENUM BIT(1) |
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|
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/* |
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* USB 2.0 Link Power Management (LPM) parameters. |
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*/ |
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struct usb2_lpm_parameters { |
|
/* Best effort service latency indicate how long the host will drive |
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* resume on an exit from L1. |
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*/ |
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unsigned int besl; |
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|
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/* Timeout value in microseconds for the L1 inactivity (LPM) timer. |
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* When the timer counts to zero, the parent hub will initiate a LPM |
|
* transition to L1. |
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*/ |
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int timeout; |
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}; |
|
|
|
/* |
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* USB 3.0 Link Power Management (LPM) parameters. |
|
* |
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* PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit. |
|
* MEL is the USB 3.0 Link PM latency for host-initiated LPM exit. |
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* All three are stored in nanoseconds. |
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*/ |
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struct usb3_lpm_parameters { |
|
/* |
|
* Maximum exit latency (MEL) for the host to send a packet to the |
|
* device (either a Ping for isoc endpoints, or a data packet for |
|
* interrupt endpoints), the hubs to decode the packet, and for all hubs |
|
* in the path to transition the links to U0. |
|
*/ |
|
unsigned int mel; |
|
/* |
|
* Maximum exit latency for a device-initiated LPM transition to bring |
|
* all links into U0. Abbreviated as "PEL" in section 9.4.12 of the USB |
|
* 3.0 spec, with no explanation of what "P" stands for. "Path"? |
|
*/ |
|
unsigned int pel; |
|
|
|
/* |
|
* The System Exit Latency (SEL) includes PEL, and three other |
|
* latencies. After a device initiates a U0 transition, it will take |
|
* some time from when the device sends the ERDY to when it will finally |
|
* receive the data packet. Basically, SEL should be the worse-case |
|
* latency from when a device starts initiating a U0 transition to when |
|
* it will get data. |
|
*/ |
|
unsigned int sel; |
|
/* |
|
* The idle timeout value that is currently programmed into the parent |
|
* hub for this device. When the timer counts to zero, the parent hub |
|
* will initiate an LPM transition to either U1 or U2. |
|
*/ |
|
int timeout; |
|
}; |
|
|
|
/** |
|
* struct usb_device - kernel's representation of a USB device |
|
* @devnum: device number; address on a USB bus |
|
* @devpath: device ID string for use in messages (e.g., /port/...) |
|
* @route: tree topology hex string for use with xHCI |
|
* @state: device state: configured, not attached, etc. |
|
* @speed: device speed: high/full/low (or error) |
|
* @rx_lanes: number of rx lanes in use, USB 3.2 adds dual-lane support |
|
* @tx_lanes: number of tx lanes in use, USB 3.2 adds dual-lane support |
|
* @tt: Transaction Translator info; used with low/full speed dev, highspeed hub |
|
* @ttport: device port on that tt hub |
|
* @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints |
|
* @parent: our hub, unless we're the root |
|
* @bus: bus we're part of |
|
* @ep0: endpoint 0 data (default control pipe) |
|
* @dev: generic device interface |
|
* @descriptor: USB device descriptor |
|
* @bos: USB device BOS descriptor set |
|
* @config: all of the device's configs |
|
* @actconfig: the active configuration |
|
* @ep_in: array of IN endpoints |
|
* @ep_out: array of OUT endpoints |
|
* @rawdescriptors: raw descriptors for each config |
|
* @bus_mA: Current available from the bus |
|
* @portnum: parent port number (origin 1) |
|
* @level: number of USB hub ancestors |
|
* @devaddr: device address, XHCI: assigned by HW, others: same as devnum |
|
* @can_submit: URBs may be submitted |
|
* @persist_enabled: USB_PERSIST enabled for this device |
|
* @have_langid: whether string_langid is valid |
|
* @authorized: policy has said we can use it; |
|
* (user space) policy determines if we authorize this device to be |
|
* used or not. By default, wired USB devices are authorized. |
|
* WUSB devices are not, until we authorize them from user space. |
|
* FIXME -- complete doc |
|
* @authenticated: Crypto authentication passed |
|
* @wusb: device is Wireless USB |
|
* @lpm_capable: device supports LPM |
|
* @usb2_hw_lpm_capable: device can perform USB2 hardware LPM |
|
* @usb2_hw_lpm_besl_capable: device can perform USB2 hardware BESL LPM |
|
* @usb2_hw_lpm_enabled: USB2 hardware LPM is enabled |
|
* @usb2_hw_lpm_allowed: Userspace allows USB 2.0 LPM to be enabled |
|
* @usb3_lpm_u1_enabled: USB3 hardware U1 LPM enabled |
|
* @usb3_lpm_u2_enabled: USB3 hardware U2 LPM enabled |
|
* @string_langid: language ID for strings |
|
* @product: iProduct string, if present (static) |
|
* @manufacturer: iManufacturer string, if present (static) |
|
* @serial: iSerialNumber string, if present (static) |
|
* @filelist: usbfs files that are open to this device |
|
* @maxchild: number of ports if hub |
|
* @quirks: quirks of the whole device |
|
* @urbnum: number of URBs submitted for the whole device |
|
* @active_duration: total time device is not suspended |
|
* @connect_time: time device was first connected |
|
* @do_remote_wakeup: remote wakeup should be enabled |
|
* @reset_resume: needs reset instead of resume |
|
* @port_is_suspended: the upstream port is suspended (L2 or U3) |
|
* @wusb_dev: if this is a Wireless USB device, link to the WUSB |
|
* specific data for the device. |
|
* @slot_id: Slot ID assigned by xHCI |
|
* @removable: Device can be physically removed from this port |
|
* @l1_params: best effor service latency for USB2 L1 LPM state, and L1 timeout. |
|
* @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout. |
|
* @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout. |
|
* @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm() |
|
* to keep track of the number of functions that require USB 3.0 Link Power |
|
* Management to be disabled for this usb_device. This count should only |
|
* be manipulated by those functions, with the bandwidth_mutex is held. |
|
* @hub_delay: cached value consisting of: |
|
* parent->hub_delay + wHubDelay + tTPTransmissionDelay (40ns) |
|
* Will be used as wValue for SetIsochDelay requests. |
|
* @use_generic_driver: ask driver core to reprobe using the generic driver. |
|
* |
|
* Notes: |
|
* Usbcore drivers should not set usbdev->state directly. Instead use |
|
* usb_set_device_state(). |
|
*/ |
|
struct usb_device { |
|
int devnum; |
|
char devpath[16]; |
|
u32 route; |
|
enum usb_device_state state; |
|
enum usb_device_speed speed; |
|
unsigned int rx_lanes; |
|
unsigned int tx_lanes; |
|
|
|
struct usb_tt *tt; |
|
int ttport; |
|
|
|
unsigned int toggle[2]; |
|
|
|
struct usb_device *parent; |
|
struct usb_bus *bus; |
|
struct usb_host_endpoint ep0; |
|
|
|
struct device dev; |
|
|
|
struct usb_device_descriptor descriptor; |
|
struct usb_host_bos *bos; |
|
struct usb_host_config *config; |
|
|
|
struct usb_host_config *actconfig; |
|
struct usb_host_endpoint *ep_in[16]; |
|
struct usb_host_endpoint *ep_out[16]; |
|
|
|
char **rawdescriptors; |
|
|
|
unsigned short bus_mA; |
|
u8 portnum; |
|
u8 level; |
|
u8 devaddr; |
|
|
|
unsigned can_submit:1; |
|
unsigned persist_enabled:1; |
|
unsigned have_langid:1; |
|
unsigned authorized:1; |
|
unsigned authenticated:1; |
|
unsigned wusb:1; |
|
unsigned lpm_capable:1; |
|
unsigned usb2_hw_lpm_capable:1; |
|
unsigned usb2_hw_lpm_besl_capable:1; |
|
unsigned usb2_hw_lpm_enabled:1; |
|
unsigned usb2_hw_lpm_allowed:1; |
|
unsigned usb3_lpm_u1_enabled:1; |
|
unsigned usb3_lpm_u2_enabled:1; |
|
int string_langid; |
|
|
|
/* static strings from the device */ |
|
char *product; |
|
char *manufacturer; |
|
char *serial; |
|
|
|
struct list_head filelist; |
|
|
|
int maxchild; |
|
|
|
u32 quirks; |
|
atomic_t urbnum; |
|
|
|
unsigned long active_duration; |
|
|
|
#ifdef CONFIG_PM |
|
unsigned long connect_time; |
|
|
|
unsigned do_remote_wakeup:1; |
|
unsigned reset_resume:1; |
|
unsigned port_is_suspended:1; |
|
#endif |
|
struct wusb_dev *wusb_dev; |
|
int slot_id; |
|
enum usb_device_removable removable; |
|
struct usb2_lpm_parameters l1_params; |
|
struct usb3_lpm_parameters u1_params; |
|
struct usb3_lpm_parameters u2_params; |
|
unsigned lpm_disable_count; |
|
|
|
u16 hub_delay; |
|
unsigned use_generic_driver:1; |
|
}; |
|
#define to_usb_device(d) container_of(d, struct usb_device, dev) |
|
|
|
static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf) |
|
{ |
|
return to_usb_device(intf->dev.parent); |
|
} |
|
|
|
extern struct usb_device *usb_get_dev(struct usb_device *dev); |
|
extern void usb_put_dev(struct usb_device *dev); |
|
extern struct usb_device *usb_hub_find_child(struct usb_device *hdev, |
|
int port1); |
|
|
|
/** |
|
* usb_hub_for_each_child - iterate over all child devices on the hub |
|
* @hdev: USB device belonging to the usb hub |
|
* @port1: portnum associated with child device |
|
* @child: child device pointer |
|
*/ |
|
#define usb_hub_for_each_child(hdev, port1, child) \ |
|
for (port1 = 1, child = usb_hub_find_child(hdev, port1); \ |
|
port1 <= hdev->maxchild; \ |
|
child = usb_hub_find_child(hdev, ++port1)) \ |
|
if (!child) continue; else |
|
|
|
/* USB device locking */ |
|
#define usb_lock_device(udev) device_lock(&(udev)->dev) |
|
#define usb_unlock_device(udev) device_unlock(&(udev)->dev) |
|
#define usb_lock_device_interruptible(udev) device_lock_interruptible(&(udev)->dev) |
|
#define usb_trylock_device(udev) device_trylock(&(udev)->dev) |
|
extern int usb_lock_device_for_reset(struct usb_device *udev, |
|
const struct usb_interface *iface); |
|
|
|
/* USB port reset for device reinitialization */ |
|
extern int usb_reset_device(struct usb_device *dev); |
|
extern void usb_queue_reset_device(struct usb_interface *dev); |
|
|
|
extern struct device *usb_intf_get_dma_device(struct usb_interface *intf); |
|
|
|
#ifdef CONFIG_ACPI |
|
extern int usb_acpi_set_power_state(struct usb_device *hdev, int index, |
|
bool enable); |
|
extern bool usb_acpi_power_manageable(struct usb_device *hdev, int index); |
|
#else |
|
static inline int usb_acpi_set_power_state(struct usb_device *hdev, int index, |
|
bool enable) { return 0; } |
|
static inline bool usb_acpi_power_manageable(struct usb_device *hdev, int index) |
|
{ return true; } |
|
#endif |
|
|
|
/* USB autosuspend and autoresume */ |
|
#ifdef CONFIG_PM |
|
extern void usb_enable_autosuspend(struct usb_device *udev); |
|
extern void usb_disable_autosuspend(struct usb_device *udev); |
|
|
|
extern int usb_autopm_get_interface(struct usb_interface *intf); |
|
extern void usb_autopm_put_interface(struct usb_interface *intf); |
|
extern int usb_autopm_get_interface_async(struct usb_interface *intf); |
|
extern void usb_autopm_put_interface_async(struct usb_interface *intf); |
|
extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf); |
|
extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf); |
|
|
|
static inline void usb_mark_last_busy(struct usb_device *udev) |
|
{ |
|
pm_runtime_mark_last_busy(&udev->dev); |
|
} |
|
|
|
#else |
|
|
|
static inline int usb_enable_autosuspend(struct usb_device *udev) |
|
{ return 0; } |
|
static inline int usb_disable_autosuspend(struct usb_device *udev) |
|
{ return 0; } |
|
|
|
static inline int usb_autopm_get_interface(struct usb_interface *intf) |
|
{ return 0; } |
|
static inline int usb_autopm_get_interface_async(struct usb_interface *intf) |
|
{ return 0; } |
|
|
|
static inline void usb_autopm_put_interface(struct usb_interface *intf) |
|
{ } |
|
static inline void usb_autopm_put_interface_async(struct usb_interface *intf) |
|
{ } |
|
static inline void usb_autopm_get_interface_no_resume( |
|
struct usb_interface *intf) |
|
{ } |
|
static inline void usb_autopm_put_interface_no_suspend( |
|
struct usb_interface *intf) |
|
{ } |
|
static inline void usb_mark_last_busy(struct usb_device *udev) |
|
{ } |
|
#endif |
|
|
|
extern int usb_disable_lpm(struct usb_device *udev); |
|
extern void usb_enable_lpm(struct usb_device *udev); |
|
/* Same as above, but these functions lock/unlock the bandwidth_mutex. */ |
|
extern int usb_unlocked_disable_lpm(struct usb_device *udev); |
|
extern void usb_unlocked_enable_lpm(struct usb_device *udev); |
|
|
|
extern int usb_disable_ltm(struct usb_device *udev); |
|
extern void usb_enable_ltm(struct usb_device *udev); |
|
|
|
static inline bool usb_device_supports_ltm(struct usb_device *udev) |
|
{ |
|
if (udev->speed < USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap) |
|
return false; |
|
return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT; |
|
} |
|
|
|
static inline bool usb_device_no_sg_constraint(struct usb_device *udev) |
|
{ |
|
return udev && udev->bus && udev->bus->no_sg_constraint; |
|
} |
|
|
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
/* for drivers using iso endpoints */ |
|
extern int usb_get_current_frame_number(struct usb_device *usb_dev); |
|
|
|
/* Sets up a group of bulk endpoints to support multiple stream IDs. */ |
|
extern int usb_alloc_streams(struct usb_interface *interface, |
|
struct usb_host_endpoint **eps, unsigned int num_eps, |
|
unsigned int num_streams, gfp_t mem_flags); |
|
|
|
/* Reverts a group of bulk endpoints back to not using stream IDs. */ |
|
extern int usb_free_streams(struct usb_interface *interface, |
|
struct usb_host_endpoint **eps, unsigned int num_eps, |
|
gfp_t mem_flags); |
|
|
|
/* used these for multi-interface device registration */ |
|
extern int usb_driver_claim_interface(struct usb_driver *driver, |
|
struct usb_interface *iface, void *priv); |
|
|
|
/** |
|
* usb_interface_claimed - returns true iff an interface is claimed |
|
* @iface: the interface being checked |
|
* |
|
* Return: %true (nonzero) iff the interface is claimed, else %false |
|
* (zero). |
|
* |
|
* Note: |
|
* Callers must own the driver model's usb bus readlock. So driver |
|
* probe() entries don't need extra locking, but other call contexts |
|
* may need to explicitly claim that lock. |
|
* |
|
*/ |
|
static inline int usb_interface_claimed(struct usb_interface *iface) |
|
{ |
|
return (iface->dev.driver != NULL); |
|
} |
|
|
|
extern void usb_driver_release_interface(struct usb_driver *driver, |
|
struct usb_interface *iface); |
|
const struct usb_device_id *usb_match_id(struct usb_interface *interface, |
|
const struct usb_device_id *id); |
|
extern int usb_match_one_id(struct usb_interface *interface, |
|
const struct usb_device_id *id); |
|
|
|
extern int usb_for_each_dev(void *data, int (*fn)(struct usb_device *, void *)); |
|
extern struct usb_interface *usb_find_interface(struct usb_driver *drv, |
|
int minor); |
|
extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev, |
|
unsigned ifnum); |
|
extern struct usb_host_interface *usb_altnum_to_altsetting( |
|
const struct usb_interface *intf, unsigned int altnum); |
|
extern struct usb_host_interface *usb_find_alt_setting( |
|
struct usb_host_config *config, |
|
unsigned int iface_num, |
|
unsigned int alt_num); |
|
|
|
/* port claiming functions */ |
|
int usb_hub_claim_port(struct usb_device *hdev, unsigned port1, |
|
struct usb_dev_state *owner); |
|
int usb_hub_release_port(struct usb_device *hdev, unsigned port1, |
|
struct usb_dev_state *owner); |
|
|
|
/** |
|
* usb_make_path - returns stable device path in the usb tree |
|
* @dev: the device whose path is being constructed |
|
* @buf: where to put the string |
|
* @size: how big is "buf"? |
|
* |
|
* Return: Length of the string (> 0) or negative if size was too small. |
|
* |
|
* Note: |
|
* This identifier is intended to be "stable", reflecting physical paths in |
|
* hardware such as physical bus addresses for host controllers or ports on |
|
* USB hubs. That makes it stay the same until systems are physically |
|
* reconfigured, by re-cabling a tree of USB devices or by moving USB host |
|
* controllers. Adding and removing devices, including virtual root hubs |
|
* in host controller driver modules, does not change these path identifiers; |
|
* neither does rebooting or re-enumerating. These are more useful identifiers |
|
* than changeable ("unstable") ones like bus numbers or device addresses. |
|
* |
|
* With a partial exception for devices connected to USB 2.0 root hubs, these |
|
* identifiers are also predictable. So long as the device tree isn't changed, |
|
* plugging any USB device into a given hub port always gives it the same path. |
|
* Because of the use of "companion" controllers, devices connected to ports on |
|
* USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are |
|
* high speed, and a different one if they are full or low speed. |
|
*/ |
|
static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size) |
|
{ |
|
int actual; |
|
actual = snprintf(buf, size, "usb-%s-%s", dev->bus->bus_name, |
|
dev->devpath); |
|
return (actual >= (int)size) ? -1 : actual; |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
#define USB_DEVICE_ID_MATCH_DEVICE \ |
|
(USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT) |
|
#define USB_DEVICE_ID_MATCH_DEV_RANGE \ |
|
(USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI) |
|
#define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \ |
|
(USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE) |
|
#define USB_DEVICE_ID_MATCH_DEV_INFO \ |
|
(USB_DEVICE_ID_MATCH_DEV_CLASS | \ |
|
USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \ |
|
USB_DEVICE_ID_MATCH_DEV_PROTOCOL) |
|
#define USB_DEVICE_ID_MATCH_INT_INFO \ |
|
(USB_DEVICE_ID_MATCH_INT_CLASS | \ |
|
USB_DEVICE_ID_MATCH_INT_SUBCLASS | \ |
|
USB_DEVICE_ID_MATCH_INT_PROTOCOL) |
|
|
|
/** |
|
* USB_DEVICE - macro used to describe a specific usb device |
|
* @vend: the 16 bit USB Vendor ID |
|
* @prod: the 16 bit USB Product ID |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific device. |
|
*/ |
|
#define USB_DEVICE(vend, prod) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE, \ |
|
.idVendor = (vend), \ |
|
.idProduct = (prod) |
|
/** |
|
* USB_DEVICE_VER - describe a specific usb device with a version range |
|
* @vend: the 16 bit USB Vendor ID |
|
* @prod: the 16 bit USB Product ID |
|
* @lo: the bcdDevice_lo value |
|
* @hi: the bcdDevice_hi value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific device, with a version range. |
|
*/ |
|
#define USB_DEVICE_VER(vend, prod, lo, hi) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \ |
|
.idVendor = (vend), \ |
|
.idProduct = (prod), \ |
|
.bcdDevice_lo = (lo), \ |
|
.bcdDevice_hi = (hi) |
|
|
|
/** |
|
* USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class |
|
* @vend: the 16 bit USB Vendor ID |
|
* @prod: the 16 bit USB Product ID |
|
* @cl: bInterfaceClass value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific interface class of devices. |
|
*/ |
|
#define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ |
|
USB_DEVICE_ID_MATCH_INT_CLASS, \ |
|
.idVendor = (vend), \ |
|
.idProduct = (prod), \ |
|
.bInterfaceClass = (cl) |
|
|
|
/** |
|
* USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol |
|
* @vend: the 16 bit USB Vendor ID |
|
* @prod: the 16 bit USB Product ID |
|
* @pr: bInterfaceProtocol value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific interface protocol of devices. |
|
*/ |
|
#define USB_DEVICE_INTERFACE_PROTOCOL(vend, prod, pr) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ |
|
USB_DEVICE_ID_MATCH_INT_PROTOCOL, \ |
|
.idVendor = (vend), \ |
|
.idProduct = (prod), \ |
|
.bInterfaceProtocol = (pr) |
|
|
|
/** |
|
* USB_DEVICE_INTERFACE_NUMBER - describe a usb device with a specific interface number |
|
* @vend: the 16 bit USB Vendor ID |
|
* @prod: the 16 bit USB Product ID |
|
* @num: bInterfaceNumber value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific interface number of devices. |
|
*/ |
|
#define USB_DEVICE_INTERFACE_NUMBER(vend, prod, num) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \ |
|
USB_DEVICE_ID_MATCH_INT_NUMBER, \ |
|
.idVendor = (vend), \ |
|
.idProduct = (prod), \ |
|
.bInterfaceNumber = (num) |
|
|
|
/** |
|
* USB_DEVICE_INFO - macro used to describe a class of usb devices |
|
* @cl: bDeviceClass value |
|
* @sc: bDeviceSubClass value |
|
* @pr: bDeviceProtocol value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific class of devices. |
|
*/ |
|
#define USB_DEVICE_INFO(cl, sc, pr) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, \ |
|
.bDeviceClass = (cl), \ |
|
.bDeviceSubClass = (sc), \ |
|
.bDeviceProtocol = (pr) |
|
|
|
/** |
|
* USB_INTERFACE_INFO - macro used to describe a class of usb interfaces |
|
* @cl: bInterfaceClass value |
|
* @sc: bInterfaceSubClass value |
|
* @pr: bInterfaceProtocol value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific class of interfaces. |
|
*/ |
|
#define USB_INTERFACE_INFO(cl, sc, pr) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO, \ |
|
.bInterfaceClass = (cl), \ |
|
.bInterfaceSubClass = (sc), \ |
|
.bInterfaceProtocol = (pr) |
|
|
|
/** |
|
* USB_DEVICE_AND_INTERFACE_INFO - describe a specific usb device with a class of usb interfaces |
|
* @vend: the 16 bit USB Vendor ID |
|
* @prod: the 16 bit USB Product ID |
|
* @cl: bInterfaceClass value |
|
* @sc: bInterfaceSubClass value |
|
* @pr: bInterfaceProtocol value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific device with a specific class of interfaces. |
|
* |
|
* This is especially useful when explicitly matching devices that have |
|
* vendor specific bDeviceClass values, but standards-compliant interfaces. |
|
*/ |
|
#define USB_DEVICE_AND_INTERFACE_INFO(vend, prod, cl, sc, pr) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ |
|
| USB_DEVICE_ID_MATCH_DEVICE, \ |
|
.idVendor = (vend), \ |
|
.idProduct = (prod), \ |
|
.bInterfaceClass = (cl), \ |
|
.bInterfaceSubClass = (sc), \ |
|
.bInterfaceProtocol = (pr) |
|
|
|
/** |
|
* USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces |
|
* @vend: the 16 bit USB Vendor ID |
|
* @cl: bInterfaceClass value |
|
* @sc: bInterfaceSubClass value |
|
* @pr: bInterfaceProtocol value |
|
* |
|
* This macro is used to create a struct usb_device_id that matches a |
|
* specific vendor with a specific class of interfaces. |
|
* |
|
* This is especially useful when explicitly matching devices that have |
|
* vendor specific bDeviceClass values, but standards-compliant interfaces. |
|
*/ |
|
#define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \ |
|
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO \ |
|
| USB_DEVICE_ID_MATCH_VENDOR, \ |
|
.idVendor = (vend), \ |
|
.bInterfaceClass = (cl), \ |
|
.bInterfaceSubClass = (sc), \ |
|
.bInterfaceProtocol = (pr) |
|
|
|
/* ----------------------------------------------------------------------- */ |
|
|
|
/* Stuff for dynamic usb ids */ |
|
struct usb_dynids { |
|
spinlock_t lock; |
|
struct list_head list; |
|
}; |
|
|
|
struct usb_dynid { |
|
struct list_head node; |
|
struct usb_device_id id; |
|
}; |
|
|
|
extern ssize_t usb_store_new_id(struct usb_dynids *dynids, |
|
const struct usb_device_id *id_table, |
|
struct device_driver *driver, |
|
const char *buf, size_t count); |
|
|
|
extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf); |
|
|
|
/** |
|
* struct usbdrv_wrap - wrapper for driver-model structure |
|
* @driver: The driver-model core driver structure. |
|
* @for_devices: Non-zero for device drivers, 0 for interface drivers. |
|
*/ |
|
struct usbdrv_wrap { |
|
struct device_driver driver; |
|
int for_devices; |
|
}; |
|
|
|
/** |
|
* struct usb_driver - identifies USB interface driver to usbcore |
|
* @name: The driver name should be unique among USB drivers, |
|
* and should normally be the same as the module name. |
|
* @probe: Called to see if the driver is willing to manage a particular |
|
* interface on a device. If it is, probe returns zero and uses |
|
* usb_set_intfdata() to associate driver-specific data with the |
|
* interface. It may also use usb_set_interface() to specify the |
|
* appropriate altsetting. If unwilling to manage the interface, |
|
* return -ENODEV, if genuine IO errors occurred, an appropriate |
|
* negative errno value. |
|
* @disconnect: Called when the interface is no longer accessible, usually |
|
* because its device has been (or is being) disconnected or the |
|
* driver module is being unloaded. |
|
* @unlocked_ioctl: Used for drivers that want to talk to userspace through |
|
* the "usbfs" filesystem. This lets devices provide ways to |
|
* expose information to user space regardless of where they |
|
* do (or don't) show up otherwise in the filesystem. |
|
* @suspend: Called when the device is going to be suspended by the |
|
* system either from system sleep or runtime suspend context. The |
|
* return value will be ignored in system sleep context, so do NOT |
|
* try to continue using the device if suspend fails in this case. |
|
* Instead, let the resume or reset-resume routine recover from |
|
* the failure. |
|
* @resume: Called when the device is being resumed by the system. |
|
* @reset_resume: Called when the suspended device has been reset instead |
|
* of being resumed. |
|
* @pre_reset: Called by usb_reset_device() when the device is about to be |
|
* reset. This routine must not return until the driver has no active |
|
* URBs for the device, and no more URBs may be submitted until the |
|
* post_reset method is called. |
|
* @post_reset: Called by usb_reset_device() after the device |
|
* has been reset |
|
* @id_table: USB drivers use ID table to support hotplugging. |
|
* Export this with MODULE_DEVICE_TABLE(usb,...). This must be set |
|
* or your driver's probe function will never get called. |
|
* @dev_groups: Attributes attached to the device that will be created once it |
|
* is bound to the driver. |
|
* @dynids: used internally to hold the list of dynamically added device |
|
* ids for this driver. |
|
* @drvwrap: Driver-model core structure wrapper. |
|
* @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be |
|
* added to this driver by preventing the sysfs file from being created. |
|
* @supports_autosuspend: if set to 0, the USB core will not allow autosuspend |
|
* for interfaces bound to this driver. |
|
* @soft_unbind: if set to 1, the USB core will not kill URBs and disable |
|
* endpoints before calling the driver's disconnect method. |
|
* @disable_hub_initiated_lpm: if set to 1, the USB core will not allow hubs |
|
* to initiate lower power link state transitions when an idle timeout |
|
* occurs. Device-initiated USB 3.0 link PM will still be allowed. |
|
* |
|
* USB interface drivers must provide a name, probe() and disconnect() |
|
* methods, and an id_table. Other driver fields are optional. |
|
* |
|
* The id_table is used in hotplugging. It holds a set of descriptors, |
|
* and specialized data may be associated with each entry. That table |
|
* is used by both user and kernel mode hotplugging support. |
|
* |
|
* The probe() and disconnect() methods are called in a context where |
|
* they can sleep, but they should avoid abusing the privilege. Most |
|
* work to connect to a device should be done when the device is opened, |
|
* and undone at the last close. The disconnect code needs to address |
|
* concurrency issues with respect to open() and close() methods, as |
|
* well as forcing all pending I/O requests to complete (by unlinking |
|
* them as necessary, and blocking until the unlinks complete). |
|
*/ |
|
struct usb_driver { |
|
const char *name; |
|
|
|
int (*probe) (struct usb_interface *intf, |
|
const struct usb_device_id *id); |
|
|
|
void (*disconnect) (struct usb_interface *intf); |
|
|
|
int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code, |
|
void *buf); |
|
|
|
int (*suspend) (struct usb_interface *intf, pm_message_t message); |
|
int (*resume) (struct usb_interface *intf); |
|
int (*reset_resume)(struct usb_interface *intf); |
|
|
|
int (*pre_reset)(struct usb_interface *intf); |
|
int (*post_reset)(struct usb_interface *intf); |
|
|
|
const struct usb_device_id *id_table; |
|
const struct attribute_group **dev_groups; |
|
|
|
struct usb_dynids dynids; |
|
struct usbdrv_wrap drvwrap; |
|
unsigned int no_dynamic_id:1; |
|
unsigned int supports_autosuspend:1; |
|
unsigned int disable_hub_initiated_lpm:1; |
|
unsigned int soft_unbind:1; |
|
}; |
|
#define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver) |
|
|
|
/** |
|
* struct usb_device_driver - identifies USB device driver to usbcore |
|
* @name: The driver name should be unique among USB drivers, |
|
* and should normally be the same as the module name. |
|
* @match: If set, used for better device/driver matching. |
|
* @probe: Called to see if the driver is willing to manage a particular |
|
* device. If it is, probe returns zero and uses dev_set_drvdata() |
|
* to associate driver-specific data with the device. If unwilling |
|
* to manage the device, return a negative errno value. |
|
* @disconnect: Called when the device is no longer accessible, usually |
|
* because it has been (or is being) disconnected or the driver's |
|
* module is being unloaded. |
|
* @suspend: Called when the device is going to be suspended by the system. |
|
* @resume: Called when the device is being resumed by the system. |
|
* @dev_groups: Attributes attached to the device that will be created once it |
|
* is bound to the driver. |
|
* @drvwrap: Driver-model core structure wrapper. |
|
* @id_table: used with @match() to select better matching driver at |
|
* probe() time. |
|
* @supports_autosuspend: if set to 0, the USB core will not allow autosuspend |
|
* for devices bound to this driver. |
|
* @generic_subclass: if set to 1, the generic USB driver's probe, disconnect, |
|
* resume and suspend functions will be called in addition to the driver's |
|
* own, so this part of the setup does not need to be replicated. |
|
* |
|
* USB drivers must provide all the fields listed above except drvwrap, |
|
* match, and id_table. |
|
*/ |
|
struct usb_device_driver { |
|
const char *name; |
|
|
|
bool (*match) (struct usb_device *udev); |
|
int (*probe) (struct usb_device *udev); |
|
void (*disconnect) (struct usb_device *udev); |
|
|
|
int (*suspend) (struct usb_device *udev, pm_message_t message); |
|
int (*resume) (struct usb_device *udev, pm_message_t message); |
|
const struct attribute_group **dev_groups; |
|
struct usbdrv_wrap drvwrap; |
|
const struct usb_device_id *id_table; |
|
unsigned int supports_autosuspend:1; |
|
unsigned int generic_subclass:1; |
|
}; |
|
#define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \ |
|
drvwrap.driver) |
|
|
|
extern struct bus_type usb_bus_type; |
|
|
|
/** |
|
* struct usb_class_driver - identifies a USB driver that wants to use the USB major number |
|
* @name: the usb class device name for this driver. Will show up in sysfs. |
|
* @devnode: Callback to provide a naming hint for a possible |
|
* device node to create. |
|
* @fops: pointer to the struct file_operations of this driver. |
|
* @minor_base: the start of the minor range for this driver. |
|
* |
|
* This structure is used for the usb_register_dev() and |
|
* usb_deregister_dev() functions, to consolidate a number of the |
|
* parameters used for them. |
|
*/ |
|
struct usb_class_driver { |
|
char *name; |
|
char *(*devnode)(struct device *dev, umode_t *mode); |
|
const struct file_operations *fops; |
|
int minor_base; |
|
}; |
|
|
|
/* |
|
* use these in module_init()/module_exit() |
|
* and don't forget MODULE_DEVICE_TABLE(usb, ...) |
|
*/ |
|
extern int usb_register_driver(struct usb_driver *, struct module *, |
|
const char *); |
|
|
|
/* use a define to avoid include chaining to get THIS_MODULE & friends */ |
|
#define usb_register(driver) \ |
|
usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME) |
|
|
|
extern void usb_deregister(struct usb_driver *); |
|
|
|
/** |
|
* module_usb_driver() - Helper macro for registering a USB driver |
|
* @__usb_driver: usb_driver struct |
|
* |
|
* Helper macro for USB drivers which do not do anything special in module |
|
* init/exit. This eliminates a lot of boilerplate. Each module may only |
|
* use this macro once, and calling it replaces module_init() and module_exit() |
|
*/ |
|
#define module_usb_driver(__usb_driver) \ |
|
module_driver(__usb_driver, usb_register, \ |
|
usb_deregister) |
|
|
|
extern int usb_register_device_driver(struct usb_device_driver *, |
|
struct module *); |
|
extern void usb_deregister_device_driver(struct usb_device_driver *); |
|
|
|
extern int usb_register_dev(struct usb_interface *intf, |
|
struct usb_class_driver *class_driver); |
|
extern void usb_deregister_dev(struct usb_interface *intf, |
|
struct usb_class_driver *class_driver); |
|
|
|
extern int usb_disabled(void); |
|
|
|
/* ----------------------------------------------------------------------- */ |
|
|
|
/* |
|
* URB support, for asynchronous request completions |
|
*/ |
|
|
|
/* |
|
* urb->transfer_flags: |
|
* |
|
* Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb(). |
|
*/ |
|
#define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */ |
|
#define URB_ISO_ASAP 0x0002 /* iso-only; use the first unexpired |
|
* slot in the schedule */ |
|
#define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */ |
|
#define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */ |
|
#define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt |
|
* needed */ |
|
#define URB_FREE_BUFFER 0x0100 /* Free transfer buffer with the URB */ |
|
|
|
/* The following flags are used internally by usbcore and HCDs */ |
|
#define URB_DIR_IN 0x0200 /* Transfer from device to host */ |
|
#define URB_DIR_OUT 0 |
|
#define URB_DIR_MASK URB_DIR_IN |
|
|
|
#define URB_DMA_MAP_SINGLE 0x00010000 /* Non-scatter-gather mapping */ |
|
#define URB_DMA_MAP_PAGE 0x00020000 /* HCD-unsupported S-G */ |
|
#define URB_DMA_MAP_SG 0x00040000 /* HCD-supported S-G */ |
|
#define URB_MAP_LOCAL 0x00080000 /* HCD-local-memory mapping */ |
|
#define URB_SETUP_MAP_SINGLE 0x00100000 /* Setup packet DMA mapped */ |
|
#define URB_SETUP_MAP_LOCAL 0x00200000 /* HCD-local setup packet */ |
|
#define URB_DMA_SG_COMBINED 0x00400000 /* S-G entries were combined */ |
|
#define URB_ALIGNED_TEMP_BUFFER 0x00800000 /* Temp buffer was alloc'd */ |
|
|
|
struct usb_iso_packet_descriptor { |
|
unsigned int offset; |
|
unsigned int length; /* expected length */ |
|
unsigned int actual_length; |
|
int status; |
|
}; |
|
|
|
struct urb; |
|
|
|
struct usb_anchor { |
|
struct list_head urb_list; |
|
wait_queue_head_t wait; |
|
spinlock_t lock; |
|
atomic_t suspend_wakeups; |
|
unsigned int poisoned:1; |
|
}; |
|
|
|
static inline void init_usb_anchor(struct usb_anchor *anchor) |
|
{ |
|
memset(anchor, 0, sizeof(*anchor)); |
|
INIT_LIST_HEAD(&anchor->urb_list); |
|
init_waitqueue_head(&anchor->wait); |
|
spin_lock_init(&anchor->lock); |
|
} |
|
|
|
typedef void (*usb_complete_t)(struct urb *); |
|
|
|
/** |
|
* struct urb - USB Request Block |
|
* @urb_list: For use by current owner of the URB. |
|
* @anchor_list: membership in the list of an anchor |
|
* @anchor: to anchor URBs to a common mooring |
|
* @ep: Points to the endpoint's data structure. Will eventually |
|
* replace @pipe. |
|
* @pipe: Holds endpoint number, direction, type, and more. |
|
* Create these values with the eight macros available; |
|
* usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl" |
|
* (control), "bulk", "int" (interrupt), or "iso" (isochronous). |
|
* For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint |
|
* numbers range from zero to fifteen. Note that "in" endpoint two |
|
* is a different endpoint (and pipe) from "out" endpoint two. |
|
* The current configuration controls the existence, type, and |
|
* maximum packet size of any given endpoint. |
|
* @stream_id: the endpoint's stream ID for bulk streams |
|
* @dev: Identifies the USB device to perform the request. |
|
* @status: This is read in non-iso completion functions to get the |
|
* status of the particular request. ISO requests only use it |
|
* to tell whether the URB was unlinked; detailed status for |
|
* each frame is in the fields of the iso_frame-desc. |
|
* @transfer_flags: A variety of flags may be used to affect how URB |
|
* submission, unlinking, or operation are handled. Different |
|
* kinds of URB can use different flags. |
|
* @transfer_buffer: This identifies the buffer to (or from) which the I/O |
|
* request will be performed unless URB_NO_TRANSFER_DMA_MAP is set |
|
* (however, do not leave garbage in transfer_buffer even then). |
|
* This buffer must be suitable for DMA; allocate it with |
|
* kmalloc() or equivalent. For transfers to "in" endpoints, contents |
|
* of this buffer will be modified. This buffer is used for the data |
|
* stage of control transfers. |
|
* @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP, |
|
* the device driver is saying that it provided this DMA address, |
|
* which the host controller driver should use in preference to the |
|
* transfer_buffer. |
|
* @sg: scatter gather buffer list, the buffer size of each element in |
|
* the list (except the last) must be divisible by the endpoint's |
|
* max packet size if no_sg_constraint isn't set in 'struct usb_bus' |
|
* @num_mapped_sgs: (internal) number of mapped sg entries |
|
* @num_sgs: number of entries in the sg list |
|
* @transfer_buffer_length: How big is transfer_buffer. The transfer may |
|
* be broken up into chunks according to the current maximum packet |
|
* size for the endpoint, which is a function of the configuration |
|
* and is encoded in the pipe. When the length is zero, neither |
|
* transfer_buffer nor transfer_dma is used. |
|
* @actual_length: This is read in non-iso completion functions, and |
|
* it tells how many bytes (out of transfer_buffer_length) were |
|
* transferred. It will normally be the same as requested, unless |
|
* either an error was reported or a short read was performed. |
|
* The URB_SHORT_NOT_OK transfer flag may be used to make such |
|
* short reads be reported as errors. |
|
* @setup_packet: Only used for control transfers, this points to eight bytes |
|
* of setup data. Control transfers always start by sending this data |
|
* to the device. Then transfer_buffer is read or written, if needed. |
|
* @setup_dma: DMA pointer for the setup packet. The caller must not use |
|
* this field; setup_packet must point to a valid buffer. |
|
* @start_frame: Returns the initial frame for isochronous transfers. |
|
* @number_of_packets: Lists the number of ISO transfer buffers. |
|
* @interval: Specifies the polling interval for interrupt or isochronous |
|
* transfers. The units are frames (milliseconds) for full and low |
|
* speed devices, and microframes (1/8 millisecond) for highspeed |
|
* and SuperSpeed devices. |
|
* @error_count: Returns the number of ISO transfers that reported errors. |
|
* @context: For use in completion functions. This normally points to |
|
* request-specific driver context. |
|
* @complete: Completion handler. This URB is passed as the parameter to the |
|
* completion function. The completion function may then do what |
|
* it likes with the URB, including resubmitting or freeing it. |
|
* @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to |
|
* collect the transfer status for each buffer. |
|
* |
|
* This structure identifies USB transfer requests. URBs must be allocated by |
|
* calling usb_alloc_urb() and freed with a call to usb_free_urb(). |
|
* Initialization may be done using various usb_fill_*_urb() functions. URBs |
|
* are submitted using usb_submit_urb(), and pending requests may be canceled |
|
* using usb_unlink_urb() or usb_kill_urb(). |
|
* |
|
* Data Transfer Buffers: |
|
* |
|
* Normally drivers provide I/O buffers allocated with kmalloc() or otherwise |
|
* taken from the general page pool. That is provided by transfer_buffer |
|
* (control requests also use setup_packet), and host controller drivers |
|
* perform a dma mapping (and unmapping) for each buffer transferred. Those |
|
* mapping operations can be expensive on some platforms (perhaps using a dma |
|
* bounce buffer or talking to an IOMMU), |
|
* although they're cheap on commodity x86 and ppc hardware. |
|
* |
|
* Alternatively, drivers may pass the URB_NO_TRANSFER_DMA_MAP transfer flag, |
|
* which tells the host controller driver that no such mapping is needed for |
|
* the transfer_buffer since |
|
* the device driver is DMA-aware. For example, a device driver might |
|
* allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map(). |
|
* When this transfer flag is provided, host controller drivers will |
|
* attempt to use the dma address found in the transfer_dma |
|
* field rather than determining a dma address themselves. |
|
* |
|
* Note that transfer_buffer must still be set if the controller |
|
* does not support DMA (as indicated by hcd_uses_dma()) and when talking |
|
* to root hub. If you have to trasfer between highmem zone and the device |
|
* on such controller, create a bounce buffer or bail out with an error. |
|
* If transfer_buffer cannot be set (is in highmem) and the controller is DMA |
|
* capable, assign NULL to it, so that usbmon knows not to use the value. |
|
* The setup_packet must always be set, so it cannot be located in highmem. |
|
* |
|
* Initialization: |
|
* |
|
* All URBs submitted must initialize the dev, pipe, transfer_flags (may be |
|
* zero), and complete fields. All URBs must also initialize |
|
* transfer_buffer and transfer_buffer_length. They may provide the |
|
* URB_SHORT_NOT_OK transfer flag, indicating that short reads are |
|
* to be treated as errors; that flag is invalid for write requests. |
|
* |
|
* Bulk URBs may |
|
* use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers |
|
* should always terminate with a short packet, even if it means adding an |
|
* extra zero length packet. |
|
* |
|
* Control URBs must provide a valid pointer in the setup_packet field. |
|
* Unlike the transfer_buffer, the setup_packet may not be mapped for DMA |
|
* beforehand. |
|
* |
|
* Interrupt URBs must provide an interval, saying how often (in milliseconds |
|
* or, for highspeed devices, 125 microsecond units) |
|
* to poll for transfers. After the URB has been submitted, the interval |
|
* field reflects how the transfer was actually scheduled. |
|
* The polling interval may be more frequent than requested. |
|
* For example, some controllers have a maximum interval of 32 milliseconds, |
|
* while others support intervals of up to 1024 milliseconds. |
|
* Isochronous URBs also have transfer intervals. (Note that for isochronous |
|
* endpoints, as well as high speed interrupt endpoints, the encoding of |
|
* the transfer interval in the endpoint descriptor is logarithmic. |
|
* Device drivers must convert that value to linear units themselves.) |
|
* |
|
* If an isochronous endpoint queue isn't already running, the host |
|
* controller will schedule a new URB to start as soon as bandwidth |
|
* utilization allows. If the queue is running then a new URB will be |
|
* scheduled to start in the first transfer slot following the end of the |
|
* preceding URB, if that slot has not already expired. If the slot has |
|
* expired (which can happen when IRQ delivery is delayed for a long time), |
|
* the scheduling behavior depends on the URB_ISO_ASAP flag. If the flag |
|
* is clear then the URB will be scheduled to start in the expired slot, |
|
* implying that some of its packets will not be transferred; if the flag |
|
* is set then the URB will be scheduled in the first unexpired slot, |
|
* breaking the queue's synchronization. Upon URB completion, the |
|
* start_frame field will be set to the (micro)frame number in which the |
|
* transfer was scheduled. Ranges for frame counter values are HC-specific |
|
* and can go from as low as 256 to as high as 65536 frames. |
|
* |
|
* Isochronous URBs have a different data transfer model, in part because |
|
* the quality of service is only "best effort". Callers provide specially |
|
* allocated URBs, with number_of_packets worth of iso_frame_desc structures |
|
* at the end. Each such packet is an individual ISO transfer. Isochronous |
|
* URBs are normally queued, submitted by drivers to arrange that |
|
* transfers are at least double buffered, and then explicitly resubmitted |
|
* in completion handlers, so |
|
* that data (such as audio or video) streams at as constant a rate as the |
|
* host controller scheduler can support. |
|
* |
|
* Completion Callbacks: |
|
* |
|
* The completion callback is made in_interrupt(), and one of the first |
|
* things that a completion handler should do is check the status field. |
|
* The status field is provided for all URBs. It is used to report |
|
* unlinked URBs, and status for all non-ISO transfers. It should not |
|
* be examined before the URB is returned to the completion handler. |
|
* |
|
* The context field is normally used to link URBs back to the relevant |
|
* driver or request state. |
|
* |
|
* When the completion callback is invoked for non-isochronous URBs, the |
|
* actual_length field tells how many bytes were transferred. This field |
|
* is updated even when the URB terminated with an error or was unlinked. |
|
* |
|
* ISO transfer status is reported in the status and actual_length fields |
|
* of the iso_frame_desc array, and the number of errors is reported in |
|
* error_count. Completion callbacks for ISO transfers will normally |
|
* (re)submit URBs to ensure a constant transfer rate. |
|
* |
|
* Note that even fields marked "public" should not be touched by the driver |
|
* when the urb is owned by the hcd, that is, since the call to |
|
* usb_submit_urb() till the entry into the completion routine. |
|
*/ |
|
struct urb { |
|
/* private: usb core and host controller only fields in the urb */ |
|
struct kref kref; /* reference count of the URB */ |
|
int unlinked; /* unlink error code */ |
|
void *hcpriv; /* private data for host controller */ |
|
atomic_t use_count; /* concurrent submissions counter */ |
|
atomic_t reject; /* submissions will fail */ |
|
|
|
/* public: documented fields in the urb that can be used by drivers */ |
|
struct list_head urb_list; /* list head for use by the urb's |
|
* current owner */ |
|
struct list_head anchor_list; /* the URB may be anchored */ |
|
struct usb_anchor *anchor; |
|
struct usb_device *dev; /* (in) pointer to associated device */ |
|
struct usb_host_endpoint *ep; /* (internal) pointer to endpoint */ |
|
unsigned int pipe; /* (in) pipe information */ |
|
unsigned int stream_id; /* (in) stream ID */ |
|
int status; /* (return) non-ISO status */ |
|
unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/ |
|
void *transfer_buffer; /* (in) associated data buffer */ |
|
dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */ |
|
struct scatterlist *sg; /* (in) scatter gather buffer list */ |
|
int num_mapped_sgs; /* (internal) mapped sg entries */ |
|
int num_sgs; /* (in) number of entries in the sg list */ |
|
u32 transfer_buffer_length; /* (in) data buffer length */ |
|
u32 actual_length; /* (return) actual transfer length */ |
|
unsigned char *setup_packet; /* (in) setup packet (control only) */ |
|
dma_addr_t setup_dma; /* (in) dma addr for setup_packet */ |
|
int start_frame; /* (modify) start frame (ISO) */ |
|
int number_of_packets; /* (in) number of ISO packets */ |
|
int interval; /* (modify) transfer interval |
|
* (INT/ISO) */ |
|
int error_count; /* (return) number of ISO errors */ |
|
void *context; /* (in) context for completion */ |
|
usb_complete_t complete; /* (in) completion routine */ |
|
struct usb_iso_packet_descriptor iso_frame_desc[]; |
|
/* (in) ISO ONLY */ |
|
}; |
|
|
|
/* ----------------------------------------------------------------------- */ |
|
|
|
/** |
|
* usb_fill_control_urb - initializes a control urb |
|
* @urb: pointer to the urb to initialize. |
|
* @dev: pointer to the struct usb_device for this urb. |
|
* @pipe: the endpoint pipe |
|
* @setup_packet: pointer to the setup_packet buffer |
|
* @transfer_buffer: pointer to the transfer buffer |
|
* @buffer_length: length of the transfer buffer |
|
* @complete_fn: pointer to the usb_complete_t function |
|
* @context: what to set the urb context to. |
|
* |
|
* Initializes a control urb with the proper information needed to submit |
|
* it to a device. |
|
*/ |
|
static inline void usb_fill_control_urb(struct urb *urb, |
|
struct usb_device *dev, |
|
unsigned int pipe, |
|
unsigned char *setup_packet, |
|
void *transfer_buffer, |
|
int buffer_length, |
|
usb_complete_t complete_fn, |
|
void *context) |
|
{ |
|
urb->dev = dev; |
|
urb->pipe = pipe; |
|
urb->setup_packet = setup_packet; |
|
urb->transfer_buffer = transfer_buffer; |
|
urb->transfer_buffer_length = buffer_length; |
|
urb->complete = complete_fn; |
|
urb->context = context; |
|
} |
|
|
|
/** |
|
* usb_fill_bulk_urb - macro to help initialize a bulk urb |
|
* @urb: pointer to the urb to initialize. |
|
* @dev: pointer to the struct usb_device for this urb. |
|
* @pipe: the endpoint pipe |
|
* @transfer_buffer: pointer to the transfer buffer |
|
* @buffer_length: length of the transfer buffer |
|
* @complete_fn: pointer to the usb_complete_t function |
|
* @context: what to set the urb context to. |
|
* |
|
* Initializes a bulk urb with the proper information needed to submit it |
|
* to a device. |
|
*/ |
|
static inline void usb_fill_bulk_urb(struct urb *urb, |
|
struct usb_device *dev, |
|
unsigned int pipe, |
|
void *transfer_buffer, |
|
int buffer_length, |
|
usb_complete_t complete_fn, |
|
void *context) |
|
{ |
|
urb->dev = dev; |
|
urb->pipe = pipe; |
|
urb->transfer_buffer = transfer_buffer; |
|
urb->transfer_buffer_length = buffer_length; |
|
urb->complete = complete_fn; |
|
urb->context = context; |
|
} |
|
|
|
/** |
|
* usb_fill_int_urb - macro to help initialize a interrupt urb |
|
* @urb: pointer to the urb to initialize. |
|
* @dev: pointer to the struct usb_device for this urb. |
|
* @pipe: the endpoint pipe |
|
* @transfer_buffer: pointer to the transfer buffer |
|
* @buffer_length: length of the transfer buffer |
|
* @complete_fn: pointer to the usb_complete_t function |
|
* @context: what to set the urb context to. |
|
* @interval: what to set the urb interval to, encoded like |
|
* the endpoint descriptor's bInterval value. |
|
* |
|
* Initializes a interrupt urb with the proper information needed to submit |
|
* it to a device. |
|
* |
|
* Note that High Speed and SuperSpeed(+) interrupt endpoints use a logarithmic |
|
* encoding of the endpoint interval, and express polling intervals in |
|
* microframes (eight per millisecond) rather than in frames (one per |
|
* millisecond). |
|
* |
|
* Wireless USB also uses the logarithmic encoding, but specifies it in units of |
|
* 128us instead of 125us. For Wireless USB devices, the interval is passed |
|
* through to the host controller, rather than being translated into microframe |
|
* units. |
|
*/ |
|
static inline void usb_fill_int_urb(struct urb *urb, |
|
struct usb_device *dev, |
|
unsigned int pipe, |
|
void *transfer_buffer, |
|
int buffer_length, |
|
usb_complete_t complete_fn, |
|
void *context, |
|
int interval) |
|
{ |
|
urb->dev = dev; |
|
urb->pipe = pipe; |
|
urb->transfer_buffer = transfer_buffer; |
|
urb->transfer_buffer_length = buffer_length; |
|
urb->complete = complete_fn; |
|
urb->context = context; |
|
|
|
if (dev->speed == USB_SPEED_HIGH || dev->speed >= USB_SPEED_SUPER) { |
|
/* make sure interval is within allowed range */ |
|
interval = clamp(interval, 1, 16); |
|
|
|
urb->interval = 1 << (interval - 1); |
|
} else { |
|
urb->interval = interval; |
|
} |
|
|
|
urb->start_frame = -1; |
|
} |
|
|
|
extern void usb_init_urb(struct urb *urb); |
|
extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags); |
|
extern void usb_free_urb(struct urb *urb); |
|
#define usb_put_urb usb_free_urb |
|
extern struct urb *usb_get_urb(struct urb *urb); |
|
extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags); |
|
extern int usb_unlink_urb(struct urb *urb); |
|
extern void usb_kill_urb(struct urb *urb); |
|
extern void usb_poison_urb(struct urb *urb); |
|
extern void usb_unpoison_urb(struct urb *urb); |
|
extern void usb_block_urb(struct urb *urb); |
|
extern void usb_kill_anchored_urbs(struct usb_anchor *anchor); |
|
extern void usb_poison_anchored_urbs(struct usb_anchor *anchor); |
|
extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor); |
|
extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor); |
|
extern void usb_anchor_suspend_wakeups(struct usb_anchor *anchor); |
|
extern void usb_anchor_resume_wakeups(struct usb_anchor *anchor); |
|
extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor); |
|
extern void usb_unanchor_urb(struct urb *urb); |
|
extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor, |
|
unsigned int timeout); |
|
extern struct urb *usb_get_from_anchor(struct usb_anchor *anchor); |
|
extern void usb_scuttle_anchored_urbs(struct usb_anchor *anchor); |
|
extern int usb_anchor_empty(struct usb_anchor *anchor); |
|
|
|
#define usb_unblock_urb usb_unpoison_urb |
|
|
|
/** |
|
* usb_urb_dir_in - check if an URB describes an IN transfer |
|
* @urb: URB to be checked |
|
* |
|
* Return: 1 if @urb describes an IN transfer (device-to-host), |
|
* otherwise 0. |
|
*/ |
|
static inline int usb_urb_dir_in(struct urb *urb) |
|
{ |
|
return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN; |
|
} |
|
|
|
/** |
|
* usb_urb_dir_out - check if an URB describes an OUT transfer |
|
* @urb: URB to be checked |
|
* |
|
* Return: 1 if @urb describes an OUT transfer (host-to-device), |
|
* otherwise 0. |
|
*/ |
|
static inline int usb_urb_dir_out(struct urb *urb) |
|
{ |
|
return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT; |
|
} |
|
|
|
int usb_pipe_type_check(struct usb_device *dev, unsigned int pipe); |
|
int usb_urb_ep_type_check(const struct urb *urb); |
|
|
|
void *usb_alloc_coherent(struct usb_device *dev, size_t size, |
|
gfp_t mem_flags, dma_addr_t *dma); |
|
void usb_free_coherent(struct usb_device *dev, size_t size, |
|
void *addr, dma_addr_t dma); |
|
|
|
#if 0 |
|
struct urb *usb_buffer_map(struct urb *urb); |
|
void usb_buffer_dmasync(struct urb *urb); |
|
void usb_buffer_unmap(struct urb *urb); |
|
#endif |
|
|
|
struct scatterlist; |
|
int usb_buffer_map_sg(const struct usb_device *dev, int is_in, |
|
struct scatterlist *sg, int nents); |
|
#if 0 |
|
void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in, |
|
struct scatterlist *sg, int n_hw_ents); |
|
#endif |
|
void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in, |
|
struct scatterlist *sg, int n_hw_ents); |
|
|
|
/*-------------------------------------------------------------------* |
|
* SYNCHRONOUS CALL SUPPORT * |
|
*-------------------------------------------------------------------*/ |
|
|
|
extern int usb_control_msg(struct usb_device *dev, unsigned int pipe, |
|
__u8 request, __u8 requesttype, __u16 value, __u16 index, |
|
void *data, __u16 size, int timeout); |
|
extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe, |
|
void *data, int len, int *actual_length, int timeout); |
|
extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, |
|
void *data, int len, int *actual_length, |
|
int timeout); |
|
|
|
/* wrappers around usb_control_msg() for the most common standard requests */ |
|
int usb_control_msg_send(struct usb_device *dev, __u8 endpoint, __u8 request, |
|
__u8 requesttype, __u16 value, __u16 index, |
|
const void *data, __u16 size, int timeout, |
|
gfp_t memflags); |
|
int usb_control_msg_recv(struct usb_device *dev, __u8 endpoint, __u8 request, |
|
__u8 requesttype, __u16 value, __u16 index, |
|
void *data, __u16 size, int timeout, |
|
gfp_t memflags); |
|
extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype, |
|
unsigned char descindex, void *buf, int size); |
|
extern int usb_get_status(struct usb_device *dev, |
|
int recip, int type, int target, void *data); |
|
|
|
static inline int usb_get_std_status(struct usb_device *dev, |
|
int recip, int target, void *data) |
|
{ |
|
return usb_get_status(dev, recip, USB_STATUS_TYPE_STANDARD, target, |
|
data); |
|
} |
|
|
|
static inline int usb_get_ptm_status(struct usb_device *dev, void *data) |
|
{ |
|
return usb_get_status(dev, USB_RECIP_DEVICE, USB_STATUS_TYPE_PTM, |
|
0, data); |
|
} |
|
|
|
extern int usb_string(struct usb_device *dev, int index, |
|
char *buf, size_t size); |
|
|
|
/* wrappers that also update important state inside usbcore */ |
|
extern int usb_clear_halt(struct usb_device *dev, int pipe); |
|
extern int usb_reset_configuration(struct usb_device *dev); |
|
extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate); |
|
extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr); |
|
extern void usb_fixup_endpoint(struct usb_device *dev, int epaddr, |
|
int interval); |
|
|
|
/* this request isn't really synchronous, but it belongs with the others */ |
|
extern int usb_driver_set_configuration(struct usb_device *udev, int config); |
|
|
|
/* choose and set configuration for device */ |
|
extern int usb_choose_configuration(struct usb_device *udev); |
|
extern int usb_set_configuration(struct usb_device *dev, int configuration); |
|
|
|
/* |
|
* timeouts, in milliseconds, used for sending/receiving control messages |
|
* they typically complete within a few frames (msec) after they're issued |
|
* USB identifies 5 second timeouts, maybe more in a few cases, and a few |
|
* slow devices (like some MGE Ellipse UPSes) actually push that limit. |
|
*/ |
|
#define USB_CTRL_GET_TIMEOUT 5000 |
|
#define USB_CTRL_SET_TIMEOUT 5000 |
|
|
|
|
|
/** |
|
* struct usb_sg_request - support for scatter/gather I/O |
|
* @status: zero indicates success, else negative errno |
|
* @bytes: counts bytes transferred. |
|
* |
|
* These requests are initialized using usb_sg_init(), and then are used |
|
* as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most |
|
* members of the request object aren't for driver access. |
|
* |
|
* The status and bytecount values are valid only after usb_sg_wait() |
|
* returns. If the status is zero, then the bytecount matches the total |
|
* from the request. |
|
* |
|
* After an error completion, drivers may need to clear a halt condition |
|
* on the endpoint. |
|
*/ |
|
struct usb_sg_request { |
|
int status; |
|
size_t bytes; |
|
|
|
/* private: |
|
* members below are private to usbcore, |
|
* and are not provided for driver access! |
|
*/ |
|
spinlock_t lock; |
|
|
|
struct usb_device *dev; |
|
int pipe; |
|
|
|
int entries; |
|
struct urb **urbs; |
|
|
|
int count; |
|
struct completion complete; |
|
}; |
|
|
|
int usb_sg_init( |
|
struct usb_sg_request *io, |
|
struct usb_device *dev, |
|
unsigned pipe, |
|
unsigned period, |
|
struct scatterlist *sg, |
|
int nents, |
|
size_t length, |
|
gfp_t mem_flags |
|
); |
|
void usb_sg_cancel(struct usb_sg_request *io); |
|
void usb_sg_wait(struct usb_sg_request *io); |
|
|
|
|
|
/* ----------------------------------------------------------------------- */ |
|
|
|
/* |
|
* For various legacy reasons, Linux has a small cookie that's paired with |
|
* a struct usb_device to identify an endpoint queue. Queue characteristics |
|
* are defined by the endpoint's descriptor. This cookie is called a "pipe", |
|
* an unsigned int encoded as: |
|
* |
|
* - direction: bit 7 (0 = Host-to-Device [Out], |
|
* 1 = Device-to-Host [In] ... |
|
* like endpoint bEndpointAddress) |
|
* - device address: bits 8-14 ... bit positions known to uhci-hcd |
|
* - endpoint: bits 15-18 ... bit positions known to uhci-hcd |
|
* - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt, |
|
* 10 = control, 11 = bulk) |
|
* |
|
* Given the device address and endpoint descriptor, pipes are redundant. |
|
*/ |
|
|
|
/* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */ |
|
/* (yet ... they're the values used by usbfs) */ |
|
#define PIPE_ISOCHRONOUS 0 |
|
#define PIPE_INTERRUPT 1 |
|
#define PIPE_CONTROL 2 |
|
#define PIPE_BULK 3 |
|
|
|
#define usb_pipein(pipe) ((pipe) & USB_DIR_IN) |
|
#define usb_pipeout(pipe) (!usb_pipein(pipe)) |
|
|
|
#define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f) |
|
#define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf) |
|
|
|
#define usb_pipetype(pipe) (((pipe) >> 30) & 3) |
|
#define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS) |
|
#define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT) |
|
#define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL) |
|
#define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK) |
|
|
|
static inline unsigned int __create_pipe(struct usb_device *dev, |
|
unsigned int endpoint) |
|
{ |
|
return (dev->devnum << 8) | (endpoint << 15); |
|
} |
|
|
|
/* Create various pipes... */ |
|
#define usb_sndctrlpipe(dev, endpoint) \ |
|
((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint)) |
|
#define usb_rcvctrlpipe(dev, endpoint) \ |
|
((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
|
#define usb_sndisocpipe(dev, endpoint) \ |
|
((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint)) |
|
#define usb_rcvisocpipe(dev, endpoint) \ |
|
((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
|
#define usb_sndbulkpipe(dev, endpoint) \ |
|
((PIPE_BULK << 30) | __create_pipe(dev, endpoint)) |
|
#define usb_rcvbulkpipe(dev, endpoint) \ |
|
((PIPE_BULK << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
|
#define usb_sndintpipe(dev, endpoint) \ |
|
((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint)) |
|
#define usb_rcvintpipe(dev, endpoint) \ |
|
((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN) |
|
|
|
static inline struct usb_host_endpoint * |
|
usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe) |
|
{ |
|
struct usb_host_endpoint **eps; |
|
eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out; |
|
return eps[usb_pipeendpoint(pipe)]; |
|
} |
|
|
|
/*-------------------------------------------------------------------------*/ |
|
|
|
static inline __u16 |
|
usb_maxpacket(struct usb_device *udev, int pipe, int is_out) |
|
{ |
|
struct usb_host_endpoint *ep; |
|
unsigned epnum = usb_pipeendpoint(pipe); |
|
|
|
if (is_out) { |
|
WARN_ON(usb_pipein(pipe)); |
|
ep = udev->ep_out[epnum]; |
|
} else { |
|
WARN_ON(usb_pipeout(pipe)); |
|
ep = udev->ep_in[epnum]; |
|
} |
|
if (!ep) |
|
return 0; |
|
|
|
/* NOTE: only 0x07ff bits are for packet size... */ |
|
return usb_endpoint_maxp(&ep->desc); |
|
} |
|
|
|
/* ----------------------------------------------------------------------- */ |
|
|
|
/* translate USB error codes to codes user space understands */ |
|
static inline int usb_translate_errors(int error_code) |
|
{ |
|
switch (error_code) { |
|
case 0: |
|
case -ENOMEM: |
|
case -ENODEV: |
|
case -EOPNOTSUPP: |
|
return error_code; |
|
default: |
|
return -EIO; |
|
} |
|
} |
|
|
|
/* Events from the usb core */ |
|
#define USB_DEVICE_ADD 0x0001 |
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#define USB_DEVICE_REMOVE 0x0002 |
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#define USB_BUS_ADD 0x0003 |
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#define USB_BUS_REMOVE 0x0004 |
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extern void usb_register_notify(struct notifier_block *nb); |
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extern void usb_unregister_notify(struct notifier_block *nb); |
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/* debugfs stuff */ |
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extern struct dentry *usb_debug_root; |
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/* LED triggers */ |
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enum usb_led_event { |
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USB_LED_EVENT_HOST = 0, |
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USB_LED_EVENT_GADGET = 1, |
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}; |
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#ifdef CONFIG_USB_LED_TRIG |
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extern void usb_led_activity(enum usb_led_event ev); |
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#else |
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static inline void usb_led_activity(enum usb_led_event ev) {} |
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#endif |
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#endif /* __KERNEL__ */ |
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#endif
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