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Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -08001/*
2 * drivers/usb/driver.c - most of the driver model stuff for usb
3 *
4 * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
5 *
6 * based on drivers/usb/usb.c which had the following copyrights:
7 * (C) Copyright Linus Torvalds 1999
8 * (C) Copyright Johannes Erdfelt 1999-2001
9 * (C) Copyright Andreas Gal 1999
10 * (C) Copyright Gregory P. Smith 1999
11 * (C) Copyright Deti Fliegl 1999 (new USB architecture)
12 * (C) Copyright Randy Dunlap 2000
13 * (C) Copyright David Brownell 2000-2004
14 * (C) Copyright Yggdrasil Computing, Inc. 2000
15 * (usb_device_id matching changes by Adam J. Richter)
16 * (C) Copyright Greg Kroah-Hartman 2002-2003
17 *
18 * NOTE! This is not actually a driver at all, rather this is
19 * just a collection of helper routines that implement the
Alan Stern36e56a32006-07-01 22:08:06 -040020 * matching, probing, releasing, suspending and resuming for
21 * real drivers.
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -080022 *
23 */
24
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -080025#include <linux/device.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -080027#include <linux/usb.h>
Alan Stern6bc6cff2007-05-04 11:53:03 -040028#include <linux/usb/quirks.h>
Eric Lescouet27729aa2010-04-24 23:21:52 +020029#include <linux/usb/hcd.h>
Alan Stern9bbdf1e2010-01-08 12:57:28 -050030#include <linux/pm_runtime.h>
Eric Lescouet27729aa2010-04-24 23:21:52 +020031
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -080032#include "usb.h"
33
Alan Stern20dfdad2007-05-22 11:50:17 -040034
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080035#ifdef CONFIG_HOTPLUG
36
37/*
38 * Adds a new dynamic USBdevice ID to this driver,
39 * and cause the driver to probe for all devices again.
40 */
Greg Kroah-Hartman93bacef2006-12-17 21:50:23 +010041ssize_t usb_store_new_id(struct usb_dynids *dynids,
42 struct device_driver *driver,
43 const char *buf, size_t count)
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080044{
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080045 struct usb_dynid *dynid;
46 u32 idVendor = 0;
47 u32 idProduct = 0;
48 int fields = 0;
Greg Kroah-Hartman1b21d5e2006-08-28 11:43:25 -070049 int retval = 0;
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080050
51 fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
52 if (fields < 2)
53 return -EINVAL;
54
55 dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
56 if (!dynid)
57 return -ENOMEM;
58
59 INIT_LIST_HEAD(&dynid->node);
60 dynid->id.idVendor = idVendor;
61 dynid->id.idProduct = idProduct;
62 dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE;
63
Greg Kroah-Hartman93bacef2006-12-17 21:50:23 +010064 spin_lock(&dynids->lock);
Nathael Pajanie5dd0112007-09-04 11:46:23 +020065 list_add_tail(&dynid->node, &dynids->list);
Greg Kroah-Hartman93bacef2006-12-17 21:50:23 +010066 spin_unlock(&dynids->lock);
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080067
68 if (get_driver(driver)) {
Greg Kroah-Hartman1b21d5e2006-08-28 11:43:25 -070069 retval = driver_attach(driver);
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080070 put_driver(driver);
71 }
72
Greg Kroah-Hartman1b21d5e2006-08-28 11:43:25 -070073 if (retval)
74 return retval;
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080075 return count;
76}
Greg Kroah-Hartman93bacef2006-12-17 21:50:23 +010077EXPORT_SYMBOL_GPL(usb_store_new_id);
78
79static ssize_t store_new_id(struct device_driver *driver,
80 const char *buf, size_t count)
81{
82 struct usb_driver *usb_drv = to_usb_driver(driver);
83
84 return usb_store_new_id(&usb_drv->dynids, driver, buf, count);
85}
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -080086static DRIVER_ATTR(new_id, S_IWUSR, NULL, store_new_id);
87
CHENG Renquan0c7a2b72009-11-22 01:28:52 +080088/**
89 * store_remove_id - remove a USB device ID from this driver
90 * @driver: target device driver
91 * @buf: buffer for scanning device ID data
92 * @count: input size
93 *
94 * Removes a dynamic usb device ID from this driver.
95 */
96static ssize_t
97store_remove_id(struct device_driver *driver, const char *buf, size_t count)
98{
99 struct usb_dynid *dynid, *n;
100 struct usb_driver *usb_driver = to_usb_driver(driver);
101 u32 idVendor = 0;
102 u32 idProduct = 0;
103 int fields = 0;
104 int retval = 0;
105
106 fields = sscanf(buf, "%x %x", &idVendor, &idProduct);
107 if (fields < 2)
108 return -EINVAL;
109
110 spin_lock(&usb_driver->dynids.lock);
111 list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) {
112 struct usb_device_id *id = &dynid->id;
113 if ((id->idVendor == idVendor) &&
114 (id->idProduct == idProduct)) {
115 list_del(&dynid->node);
116 kfree(dynid);
117 retval = 0;
118 break;
119 }
120 }
121 spin_unlock(&usb_driver->dynids.lock);
122
123 if (retval)
124 return retval;
125 return count;
126}
127static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
128
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800129static int usb_create_newid_file(struct usb_driver *usb_drv)
130{
131 int error = 0;
132
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800133 if (usb_drv->no_dynamic_id)
134 goto exit;
135
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800136 if (usb_drv->probe != NULL)
Greg Kroah-Hartman15147ff2007-11-28 12:23:18 -0800137 error = driver_create_file(&usb_drv->drvwrap.driver,
138 &driver_attr_new_id);
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800139exit:
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800140 return error;
141}
142
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800143static void usb_remove_newid_file(struct usb_driver *usb_drv)
144{
145 if (usb_drv->no_dynamic_id)
146 return;
147
148 if (usb_drv->probe != NULL)
Greg Kroah-Hartman15147ff2007-11-28 12:23:18 -0800149 driver_remove_file(&usb_drv->drvwrap.driver,
150 &driver_attr_new_id);
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800151}
152
CHENG Renquan0c7a2b72009-11-22 01:28:52 +0800153static int
154usb_create_removeid_file(struct usb_driver *drv)
155{
156 int error = 0;
157 if (drv->probe != NULL)
158 error = driver_create_file(&drv->drvwrap.driver,
159 &driver_attr_remove_id);
160 return error;
161}
162
163static void usb_remove_removeid_file(struct usb_driver *drv)
164{
165 driver_remove_file(&drv->drvwrap.driver, &driver_attr_remove_id);
166}
167
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800168static void usb_free_dynids(struct usb_driver *usb_drv)
169{
170 struct usb_dynid *dynid, *n;
171
172 spin_lock(&usb_drv->dynids.lock);
173 list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) {
174 list_del(&dynid->node);
175 kfree(dynid);
176 }
177 spin_unlock(&usb_drv->dynids.lock);
178}
179#else
180static inline int usb_create_newid_file(struct usb_driver *usb_drv)
181{
182 return 0;
183}
184
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800185static void usb_remove_newid_file(struct usb_driver *usb_drv)
186{
187}
188
CHENG Renquan0c7a2b72009-11-22 01:28:52 +0800189static int
190usb_create_removeid_file(struct usb_driver *drv)
191{
192 return 0;
193}
194
195static void usb_remove_removeid_file(struct usb_driver *drv)
196{
197}
198
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800199static inline void usb_free_dynids(struct usb_driver *usb_drv)
200{
201}
202#endif
203
204static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf,
205 struct usb_driver *drv)
206{
207 struct usb_dynid *dynid;
208
209 spin_lock(&drv->dynids.lock);
210 list_for_each_entry(dynid, &drv->dynids.list, node) {
211 if (usb_match_one_id(intf, &dynid->id)) {
212 spin_unlock(&drv->dynids.lock);
213 return &dynid->id;
214 }
215 }
216 spin_unlock(&drv->dynids.lock);
217 return NULL;
218}
219
220
Alan Stern8bb54ab2006-07-01 22:08:49 -0400221/* called from driver core with dev locked */
222static int usb_probe_device(struct device *dev)
223{
224 struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
Kay Sievers55129662009-05-04 19:48:32 +0200225 struct usb_device *udev = to_usb_device(dev);
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500226 int error = 0;
Alan Stern8bb54ab2006-07-01 22:08:49 -0400227
Harvey Harrison441b62c2008-03-03 16:08:34 -0800228 dev_dbg(dev, "%s\n", __func__);
Alan Stern8bb54ab2006-07-01 22:08:49 -0400229
Alan Stern8bb54ab2006-07-01 22:08:49 -0400230 /* TODO: Add real matching code */
231
Alan Stern645daaa2006-08-30 15:47:02 -0400232 /* The device should always appear to be in use
233 * unless the driver suports autosuspend.
234 */
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500235 if (!udriver->supports_autosuspend)
236 error = usb_autoresume_device(udev);
Alan Stern645daaa2006-08-30 15:47:02 -0400237
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500238 if (!error)
239 error = udriver->probe(udev);
Alan Stern8bb54ab2006-07-01 22:08:49 -0400240 return error;
241}
242
243/* called from driver core with dev locked */
244static int usb_unbind_device(struct device *dev)
245{
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500246 struct usb_device *udev = to_usb_device(dev);
Alan Stern8bb54ab2006-07-01 22:08:49 -0400247 struct usb_device_driver *udriver = to_usb_device_driver(dev->driver);
248
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500249 udriver->disconnect(udev);
250 if (!udriver->supports_autosuspend)
251 usb_autosuspend_device(udev);
Alan Stern8bb54ab2006-07-01 22:08:49 -0400252 return 0;
253}
254
Inaky Perez-Gonzalezdc023dc2008-11-13 10:31:35 -0800255/*
256 * Cancel any pending scheduled resets
257 *
258 * [see usb_queue_reset_device()]
259 *
260 * Called after unconfiguring / when releasing interfaces. See
261 * comments in __usb_queue_reset_device() regarding
262 * udev->reset_running.
263 */
264static void usb_cancel_queued_reset(struct usb_interface *iface)
265{
266 if (iface->reset_running == 0)
267 cancel_work_sync(&iface->reset_ws);
268}
Alan Stern8bb54ab2006-07-01 22:08:49 -0400269
270/* called from driver core with dev locked */
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800271static int usb_probe_interface(struct device *dev)
272{
Alan Stern8bb54ab2006-07-01 22:08:49 -0400273 struct usb_driver *driver = to_usb_driver(dev->driver);
Kay Sievers55129662009-05-04 19:48:32 +0200274 struct usb_interface *intf = to_usb_interface(dev);
275 struct usb_device *udev = interface_to_usbdev(intf);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800276 const struct usb_device_id *id;
277 int error = -ENODEV;
278
Harvey Harrison441b62c2008-03-03 16:08:34 -0800279 dev_dbg(dev, "%s\n", __func__);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800280
Alan Stern78d9a482008-06-23 16:00:40 -0400281 intf->needs_binding = 0;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800282
Alan Stern7cbe5dc2009-06-29 10:56:54 -0400283 if (usb_device_is_owned(udev))
Alan Stern0f3dda92010-01-08 12:56:04 -0500284 return error;
Alan Stern7cbe5dc2009-06-29 10:56:54 -0400285
Greg Kroah-Hartman2c044a42008-01-30 15:21:33 -0800286 if (udev->authorized == 0) {
287 dev_err(&intf->dev, "Device is not authorized for usage\n");
Alan Stern0f3dda92010-01-08 12:56:04 -0500288 return error;
Greg Kroah-Hartman2c044a42008-01-30 15:21:33 -0800289 }
Inaky Perez-Gonzalez72230ab2007-07-31 20:34:03 -0700290
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800291 id = usb_match_id(intf, driver->id_table);
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800292 if (!id)
293 id = usb_match_dynamic_id(intf, driver);
Alan Stern0f3dda92010-01-08 12:56:04 -0500294 if (!id)
295 return error;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800296
Alan Stern0f3dda92010-01-08 12:56:04 -0500297 dev_dbg(dev, "%s - got id\n", __func__);
Alan Stern645daaa2006-08-30 15:47:02 -0400298
Alan Stern0f3dda92010-01-08 12:56:04 -0500299 error = usb_autoresume_device(udev);
300 if (error)
301 return error;
Alan Stern645daaa2006-08-30 15:47:02 -0400302
Alan Stern0f3dda92010-01-08 12:56:04 -0500303 intf->condition = USB_INTERFACE_BINDING;
Alan Stern645daaa2006-08-30 15:47:02 -0400304
Alan Stern571dc792010-04-09 16:03:43 -0400305 /* Probed interfaces are initially active. They are
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500306 * runtime-PM-enabled only if the driver has autosuspend support.
307 * They are sensitive to their children's power states.
Alan Stern0f3dda92010-01-08 12:56:04 -0500308 */
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500309 pm_runtime_set_active(dev);
310 pm_suspend_ignore_children(dev, false);
311 if (driver->supports_autosuspend)
312 pm_runtime_enable(dev);
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200313
Alan Stern0f3dda92010-01-08 12:56:04 -0500314 /* Carry out a deferred switch to altsetting 0 */
315 if (intf->needs_altsetting0) {
316 error = usb_set_interface(udev, intf->altsetting[0].
317 desc.bInterfaceNumber, 0);
318 if (error < 0)
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200319 goto err;
Alan Stern0f3dda92010-01-08 12:56:04 -0500320 intf->needs_altsetting0 = 0;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800321 }
322
Alan Stern0f3dda92010-01-08 12:56:04 -0500323 error = driver->probe(intf, id);
324 if (error)
325 goto err;
326
327 intf->condition = USB_INTERFACE_BOUND;
328 usb_autosuspend_device(udev);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800329 return error;
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200330
Alan Stern0f3dda92010-01-08 12:56:04 -0500331 err:
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200332 intf->needs_remote_wakeup = 0;
333 intf->condition = USB_INTERFACE_UNBOUND;
334 usb_cancel_queued_reset(intf);
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500335
336 /* Unbound interfaces are always runtime-PM-disabled and -suspended */
Alan Stern89842ae2010-05-11 11:44:06 -0400337 if (driver->supports_autosuspend)
338 pm_runtime_disable(dev);
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500339 pm_runtime_set_suspended(dev);
340
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200341 usb_autosuspend_device(udev);
342 return error;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800343}
344
Alan Stern8bb54ab2006-07-01 22:08:49 -0400345/* called from driver core with dev locked */
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800346static int usb_unbind_interface(struct device *dev)
347{
Alan Stern8bb54ab2006-07-01 22:08:49 -0400348 struct usb_driver *driver = to_usb_driver(dev->driver);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800349 struct usb_interface *intf = to_usb_interface(dev);
Alan Stern645daaa2006-08-30 15:47:02 -0400350 struct usb_device *udev;
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200351 int error, r;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800352
353 intf->condition = USB_INTERFACE_UNBINDING;
354
Alan Stern645daaa2006-08-30 15:47:02 -0400355 /* Autoresume for set_interface call below */
356 udev = interface_to_usbdev(intf);
Alan Stern94fcda12006-11-20 11:38:46 -0500357 error = usb_autoresume_device(udev);
Alan Stern645daaa2006-08-30 15:47:02 -0400358
Alan Stern9da82bd2008-05-08 11:54:37 -0400359 /* Terminate all URBs for this interface unless the driver
360 * supports "soft" unbinding.
361 */
362 if (!driver->soft_unbind)
Alan Sternddeac4e72009-01-15 17:03:33 -0500363 usb_disable_interface(udev, intf, false);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800364
Alan Stern8bb54ab2006-07-01 22:08:49 -0400365 driver->disconnect(intf);
Inaky Perez-Gonzalezdc023dc2008-11-13 10:31:35 -0800366 usb_cancel_queued_reset(intf);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800367
Alan Stern55151d72008-08-12 14:33:59 -0400368 /* Reset other interface state.
369 * We cannot do a Set-Interface if the device is suspended or
370 * if it is prepared for a system sleep (since installing a new
371 * altsetting means creating new endpoint device entries).
372 * When either of these happens, defer the Set-Interface.
373 */
Alan Stern2caf7fc2008-12-31 11:31:33 -0500374 if (intf->cur_altsetting->desc.bAlternateSetting == 0) {
375 /* Already in altsetting 0 so skip Set-Interface.
376 * Just re-enable it without affecting the endpoint toggles.
377 */
378 usb_enable_interface(udev, intf, false);
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200379 } else if (!error && intf->dev.power.status == DPM_ON) {
380 r = usb_set_interface(udev, intf->altsetting[0].
Alan Stern55151d72008-08-12 14:33:59 -0400381 desc.bInterfaceNumber, 0);
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200382 if (r < 0)
383 intf->needs_altsetting0 = 1;
384 } else {
Alan Stern55151d72008-08-12 14:33:59 -0400385 intf->needs_altsetting0 = 1;
Oliver Neukum1e5ea5e2009-08-27 16:46:56 +0200386 }
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800387 usb_set_intfdata(intf, NULL);
Alan Stern645daaa2006-08-30 15:47:02 -0400388
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800389 intf->condition = USB_INTERFACE_UNBOUND;
Alan Stern645daaa2006-08-30 15:47:02 -0400390 intf->needs_remote_wakeup = 0;
391
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500392 /* Unbound interfaces are always runtime-PM-disabled and -suspended */
Alan Stern89842ae2010-05-11 11:44:06 -0400393 if (driver->supports_autosuspend)
394 pm_runtime_disable(dev);
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500395 pm_runtime_set_suspended(dev);
396
397 /* Undo any residual pm_autopm_get_interface_* calls */
398 for (r = atomic_read(&intf->pm_usage_cnt); r > 0; --r)
399 usb_autopm_put_interface_no_suspend(intf);
400 atomic_set(&intf->pm_usage_cnt, 0);
401
Alan Stern645daaa2006-08-30 15:47:02 -0400402 if (!error)
Alan Stern94fcda12006-11-20 11:38:46 -0500403 usb_autosuspend_device(udev);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800404
405 return 0;
406}
407
Alan Stern36e56a32006-07-01 22:08:06 -0400408/**
409 * usb_driver_claim_interface - bind a driver to an interface
410 * @driver: the driver to be bound
411 * @iface: the interface to which it will be bound; must be in the
412 * usb device's active configuration
413 * @priv: driver data associated with that interface
414 *
415 * This is used by usb device drivers that need to claim more than one
416 * interface on a device when probing (audio and acm are current examples).
417 * No device driver should directly modify internal usb_interface or
418 * usb_device structure members.
419 *
420 * Few drivers should need to use this routine, since the most natural
421 * way to bind to an interface is to return the private data from
422 * the driver's probe() method.
423 *
Greg Kroah-Hartman341487a82007-04-09 11:52:31 -0400424 * Callers must own the device lock, so driver probe() entries don't need
425 * extra locking, but other call contexts may need to explicitly claim that
426 * lock.
Alan Stern36e56a32006-07-01 22:08:06 -0400427 */
428int usb_driver_claim_interface(struct usb_driver *driver,
Greg Kroah-Hartman2c044a42008-01-30 15:21:33 -0800429 struct usb_interface *iface, void *priv)
Alan Stern36e56a32006-07-01 22:08:06 -0400430{
431 struct device *dev = &iface->dev;
Greg Kroah-Hartman1b21d5e2006-08-28 11:43:25 -0700432 int retval = 0;
Alan Stern36e56a32006-07-01 22:08:06 -0400433
434 if (dev->driver)
435 return -EBUSY;
436
Alan Stern8bb54ab2006-07-01 22:08:49 -0400437 dev->driver = &driver->drvwrap.driver;
Alan Stern36e56a32006-07-01 22:08:06 -0400438 usb_set_intfdata(iface, priv);
Alan Stern78d9a482008-06-23 16:00:40 -0400439 iface->needs_binding = 0;
Alan Stern645daaa2006-08-30 15:47:02 -0400440
Alan Stern36e56a32006-07-01 22:08:06 -0400441 iface->condition = USB_INTERFACE_BOUND;
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500442
Alan Stern89842ae2010-05-11 11:44:06 -0400443 /* Claimed interfaces are initially inactive (suspended) and
444 * runtime-PM-enabled, but only if the driver has autosuspend
445 * support. Otherwise they are marked active, to prevent the
446 * device from being autosuspended, but left disabled. In either
447 * case they are sensitive to their children's power states.
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500448 */
Alan Stern9bbdf1e2010-01-08 12:57:28 -0500449 pm_suspend_ignore_children(dev, false);
450 if (driver->supports_autosuspend)
451 pm_runtime_enable(dev);
Alan Stern89842ae2010-05-11 11:44:06 -0400452 else
453 pm_runtime_set_active(dev);
Alan Stern36e56a32006-07-01 22:08:06 -0400454
455 /* if interface was already added, bind now; else let
456 * the future device_add() bind it, bypassing probe()
457 */
458 if (device_is_registered(dev))
Greg Kroah-Hartman1b21d5e2006-08-28 11:43:25 -0700459 retval = device_bind_driver(dev);
Alan Stern36e56a32006-07-01 22:08:06 -0400460
Greg Kroah-Hartman1b21d5e2006-08-28 11:43:25 -0700461 return retval;
Alan Stern36e56a32006-07-01 22:08:06 -0400462}
Greg Kroah-Hartman782e70c2008-01-25 11:12:21 -0600463EXPORT_SYMBOL_GPL(usb_driver_claim_interface);
Alan Stern36e56a32006-07-01 22:08:06 -0400464
465/**
466 * usb_driver_release_interface - unbind a driver from an interface
467 * @driver: the driver to be unbound
468 * @iface: the interface from which it will be unbound
469 *
470 * This can be used by drivers to release an interface without waiting
471 * for their disconnect() methods to be called. In typical cases this
472 * also causes the driver disconnect() method to be called.
473 *
474 * This call is synchronous, and may not be used in an interrupt context.
Greg Kroah-Hartman341487a82007-04-09 11:52:31 -0400475 * Callers must own the device lock, so driver disconnect() entries don't
476 * need extra locking, but other call contexts may need to explicitly claim
477 * that lock.
Alan Stern36e56a32006-07-01 22:08:06 -0400478 */
479void usb_driver_release_interface(struct usb_driver *driver,
480 struct usb_interface *iface)
481{
482 struct device *dev = &iface->dev;
483
484 /* this should never happen, don't release something that's not ours */
Alan Stern8bb54ab2006-07-01 22:08:49 -0400485 if (!dev->driver || dev->driver != &driver->drvwrap.driver)
Alan Stern36e56a32006-07-01 22:08:06 -0400486 return;
487
488 /* don't release from within disconnect() */
489 if (iface->condition != USB_INTERFACE_BOUND)
490 return;
Alan Stern91f8d062009-04-16 15:35:09 -0400491 iface->condition = USB_INTERFACE_UNBINDING;
Alan Stern36e56a32006-07-01 22:08:06 -0400492
Alan Stern91f8d062009-04-16 15:35:09 -0400493 /* Release via the driver core only if the interface
494 * has already been registered
495 */
Alan Stern36e56a32006-07-01 22:08:06 -0400496 if (device_is_registered(dev)) {
Alan Stern36e56a32006-07-01 22:08:06 -0400497 device_release_driver(dev);
Inaky Perez-Gonzalezdc023dc2008-11-13 10:31:35 -0800498 } else {
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800499 device_lock(dev);
Alan Stern91f8d062009-04-16 15:35:09 -0400500 usb_unbind_interface(dev);
501 dev->driver = NULL;
Greg Kroah-Hartman8e9394c2010-02-17 10:57:05 -0800502 device_unlock(dev);
Alan Stern36e56a32006-07-01 22:08:06 -0400503 }
Alan Stern36e56a32006-07-01 22:08:06 -0400504}
Greg Kroah-Hartman782e70c2008-01-25 11:12:21 -0600505EXPORT_SYMBOL_GPL(usb_driver_release_interface);
Alan Stern36e56a32006-07-01 22:08:06 -0400506
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800507/* returns 0 if no match, 1 if match */
Greg Kroah-Hartmanbb417022007-01-26 14:26:21 +0100508int usb_match_device(struct usb_device *dev, const struct usb_device_id *id)
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800509{
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800510 if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
511 id->idVendor != le16_to_cpu(dev->descriptor.idVendor))
512 return 0;
513
514 if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) &&
515 id->idProduct != le16_to_cpu(dev->descriptor.idProduct))
516 return 0;
517
518 /* No need to test id->bcdDevice_lo != 0, since 0 is never
519 greater than any unsigned number. */
520 if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) &&
521 (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice)))
522 return 0;
523
524 if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) &&
525 (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice)))
526 return 0;
527
528 if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) &&
529 (id->bDeviceClass != dev->descriptor.bDeviceClass))
530 return 0;
531
532 if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) &&
Greg Kroah-Hartman2c044a42008-01-30 15:21:33 -0800533 (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass))
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800534 return 0;
535
536 if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) &&
537 (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol))
538 return 0;
539
Greg Kroah-Hartmanbb417022007-01-26 14:26:21 +0100540 return 1;
541}
542
543/* returns 0 if no match, 1 if match */
544int usb_match_one_id(struct usb_interface *interface,
545 const struct usb_device_id *id)
546{
547 struct usb_host_interface *intf;
548 struct usb_device *dev;
549
550 /* proc_connectinfo in devio.c may call us with id == NULL. */
551 if (id == NULL)
552 return 0;
553
554 intf = interface->cur_altsetting;
555 dev = interface_to_usbdev(interface);
556
557 if (!usb_match_device(dev, id))
558 return 0;
559
Alan Stern93c8bf42006-10-18 16:41:51 -0400560 /* The interface class, subclass, and protocol should never be
561 * checked for a match if the device class is Vendor Specific,
562 * unless the match record specifies the Vendor ID. */
563 if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC &&
564 !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) &&
565 (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS |
566 USB_DEVICE_ID_MATCH_INT_SUBCLASS |
567 USB_DEVICE_ID_MATCH_INT_PROTOCOL)))
568 return 0;
569
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800570 if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) &&
571 (id->bInterfaceClass != intf->desc.bInterfaceClass))
572 return 0;
573
574 if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) &&
575 (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass))
576 return 0;
577
578 if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) &&
579 (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol))
580 return 0;
581
582 return 1;
583}
Greg Kroah-Hartman93bacef2006-12-17 21:50:23 +0100584EXPORT_SYMBOL_GPL(usb_match_one_id);
585
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800586/**
587 * usb_match_id - find first usb_device_id matching device or interface
588 * @interface: the interface of interest
589 * @id: array of usb_device_id structures, terminated by zero entry
590 *
591 * usb_match_id searches an array of usb_device_id's and returns
592 * the first one matching the device or interface, or null.
593 * This is used when binding (or rebinding) a driver to an interface.
594 * Most USB device drivers will use this indirectly, through the usb core,
595 * but some layered driver frameworks use it directly.
596 * These device tables are exported with MODULE_DEVICE_TABLE, through
597 * modutils, to support the driver loading functionality of USB hotplugging.
598 *
599 * What Matches:
600 *
601 * The "match_flags" element in a usb_device_id controls which
602 * members are used. If the corresponding bit is set, the
603 * value in the device_id must match its corresponding member
604 * in the device or interface descriptor, or else the device_id
605 * does not match.
606 *
607 * "driver_info" is normally used only by device drivers,
608 * but you can create a wildcard "matches anything" usb_device_id
609 * as a driver's "modules.usbmap" entry if you provide an id with
610 * only a nonzero "driver_info" field. If you do this, the USB device
611 * driver's probe() routine should use additional intelligence to
612 * decide whether to bind to the specified interface.
613 *
614 * What Makes Good usb_device_id Tables:
615 *
616 * The match algorithm is very simple, so that intelligence in
617 * driver selection must come from smart driver id records.
618 * Unless you have good reasons to use another selection policy,
619 * provide match elements only in related groups, and order match
620 * specifiers from specific to general. Use the macros provided
621 * for that purpose if you can.
622 *
623 * The most specific match specifiers use device descriptor
624 * data. These are commonly used with product-specific matches;
625 * the USB_DEVICE macro lets you provide vendor and product IDs,
626 * and you can also match against ranges of product revisions.
627 * These are widely used for devices with application or vendor
628 * specific bDeviceClass values.
629 *
630 * Matches based on device class/subclass/protocol specifications
631 * are slightly more general; use the USB_DEVICE_INFO macro, or
632 * its siblings. These are used with single-function devices
633 * where bDeviceClass doesn't specify that each interface has
634 * its own class.
635 *
636 * Matches based on interface class/subclass/protocol are the
637 * most general; they let drivers bind to any interface on a
638 * multiple-function device. Use the USB_INTERFACE_INFO
639 * macro, or its siblings, to match class-per-interface style
Alan Stern93c8bf42006-10-18 16:41:51 -0400640 * devices (as recorded in bInterfaceClass).
641 *
642 * Note that an entry created by USB_INTERFACE_INFO won't match
643 * any interface if the device class is set to Vendor-Specific.
644 * This is deliberate; according to the USB spec the meanings of
645 * the interface class/subclass/protocol for these devices are also
646 * vendor-specific, and hence matching against a standard product
647 * class wouldn't work anyway. If you really want to use an
648 * interface-based match for such a device, create a match record
649 * that also specifies the vendor ID. (Unforunately there isn't a
650 * standard macro for creating records like this.)
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800651 *
652 * Within those groups, remember that not all combinations are
653 * meaningful. For example, don't give a product version range
654 * without vendor and product IDs; or specify a protocol without
655 * its associated class and subclass.
656 */
657const struct usb_device_id *usb_match_id(struct usb_interface *interface,
658 const struct usb_device_id *id)
659{
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800660 /* proc_connectinfo in devio.c may call us with id == NULL. */
661 if (id == NULL)
662 return NULL;
663
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800664 /* It is important to check that id->driver_info is nonzero,
665 since an entry that is all zeroes except for a nonzero
666 id->driver_info is the way to create an entry that
667 indicates that the driver want to examine every
668 device and interface. */
Greg Kroah-Hartmande6f92b2008-01-28 09:50:12 -0800669 for (; id->idVendor || id->idProduct || id->bDeviceClass ||
670 id->bInterfaceClass || id->driver_info; id++) {
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800671 if (usb_match_one_id(interface, id))
672 return id;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800673 }
674
675 return NULL;
676}
Greg Kroah-Hartman782e70c2008-01-25 11:12:21 -0600677EXPORT_SYMBOL_GPL(usb_match_id);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800678
Adrian Bunk8bb22d22006-11-21 22:02:54 +0100679static int usb_device_match(struct device *dev, struct device_driver *drv)
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800680{
Alan Stern8bb54ab2006-07-01 22:08:49 -0400681 /* devices and interfaces are handled separately */
682 if (is_usb_device(dev)) {
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800683
Alan Stern8bb54ab2006-07-01 22:08:49 -0400684 /* interface drivers never match devices */
685 if (!is_usb_device_driver(drv))
686 return 0;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800687
Alan Stern8bb54ab2006-07-01 22:08:49 -0400688 /* TODO: Add real matching code */
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800689 return 1;
690
Kay Sievers55129662009-05-04 19:48:32 +0200691 } else if (is_usb_interface(dev)) {
Alan Stern8bb54ab2006-07-01 22:08:49 -0400692 struct usb_interface *intf;
693 struct usb_driver *usb_drv;
694 const struct usb_device_id *id;
695
696 /* device drivers never match interfaces */
697 if (is_usb_device_driver(drv))
698 return 0;
699
700 intf = to_usb_interface(dev);
701 usb_drv = to_usb_driver(drv);
702
703 id = usb_match_id(intf, usb_drv->id_table);
704 if (id)
705 return 1;
706
707 id = usb_match_dynamic_id(intf, usb_drv);
708 if (id)
709 return 1;
710 }
711
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800712 return 0;
713}
714
Alan Stern36e56a32006-07-01 22:08:06 -0400715#ifdef CONFIG_HOTPLUG
Kay Sievers7eff2e72007-08-14 15:15:12 +0200716static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
Alan Stern36e56a32006-07-01 22:08:06 -0400717{
Alan Stern36e56a32006-07-01 22:08:06 -0400718 struct usb_device *usb_dev;
Alan Stern36e56a32006-07-01 22:08:06 -0400719
Kay Sievers55129662009-05-04 19:48:32 +0200720 if (is_usb_device(dev)) {
Alan Stern782da722006-07-01 22:09:35 -0400721 usb_dev = to_usb_device(dev);
Kay Sievers55129662009-05-04 19:48:32 +0200722 } else if (is_usb_interface(dev)) {
Kay Sievers9f8b17e2007-03-13 15:59:31 +0100723 struct usb_interface *intf = to_usb_interface(dev);
Kay Sievers55129662009-05-04 19:48:32 +0200724
Alan Stern8bb54ab2006-07-01 22:08:49 -0400725 usb_dev = interface_to_usbdev(intf);
Kay Sievers55129662009-05-04 19:48:32 +0200726 } else {
727 return 0;
Alan Stern8bb54ab2006-07-01 22:08:49 -0400728 }
Alan Stern36e56a32006-07-01 22:08:06 -0400729
730 if (usb_dev->devnum < 0) {
Alan Sterncceffe92010-02-08 09:45:12 -0500731 /* driver is often null here; dev_dbg() would oops */
Kay Sievers7071a3c2008-05-02 06:02:41 +0200732 pr_debug("usb %s: already deleted?\n", dev_name(dev));
Alan Stern36e56a32006-07-01 22:08:06 -0400733 return -ENODEV;
734 }
735 if (!usb_dev->bus) {
Kay Sievers7071a3c2008-05-02 06:02:41 +0200736 pr_debug("usb %s: bus removed?\n", dev_name(dev));
Alan Stern36e56a32006-07-01 22:08:06 -0400737 return -ENODEV;
738 }
739
740#ifdef CONFIG_USB_DEVICEFS
741 /* If this is available, userspace programs can directly read
742 * all the device descriptors we don't tell them about. Or
Kay Sievers9f8b17e2007-03-13 15:59:31 +0100743 * act as usermode drivers.
Alan Stern36e56a32006-07-01 22:08:06 -0400744 */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200745 if (add_uevent_var(env, "DEVICE=/proc/bus/usb/%03d/%03d",
Alan Stern36e56a32006-07-01 22:08:06 -0400746 usb_dev->bus->busnum, usb_dev->devnum))
747 return -ENOMEM;
748#endif
749
750 /* per-device configurations are common */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200751 if (add_uevent_var(env, "PRODUCT=%x/%x/%x",
Alan Stern36e56a32006-07-01 22:08:06 -0400752 le16_to_cpu(usb_dev->descriptor.idVendor),
753 le16_to_cpu(usb_dev->descriptor.idProduct),
754 le16_to_cpu(usb_dev->descriptor.bcdDevice)))
755 return -ENOMEM;
756
757 /* class-based driver binding models */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200758 if (add_uevent_var(env, "TYPE=%d/%d/%d",
Alan Stern36e56a32006-07-01 22:08:06 -0400759 usb_dev->descriptor.bDeviceClass,
760 usb_dev->descriptor.bDeviceSubClass,
761 usb_dev->descriptor.bDeviceProtocol))
762 return -ENOMEM;
763
Alan Stern36e56a32006-07-01 22:08:06 -0400764 return 0;
765}
766
767#else
768
Kay Sievers7eff2e72007-08-14 15:15:12 +0200769static int usb_uevent(struct device *dev, struct kobj_uevent_env *env)
Alan Stern36e56a32006-07-01 22:08:06 -0400770{
771 return -ENODEV;
772}
Alan Stern36e56a32006-07-01 22:08:06 -0400773#endif /* CONFIG_HOTPLUG */
774
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800775/**
Alan Stern8bb54ab2006-07-01 22:08:49 -0400776 * usb_register_device_driver - register a USB device (not interface) driver
777 * @new_udriver: USB operations for the device driver
Greg Kroah-Hartman2143acc2005-11-21 14:53:03 -0800778 * @owner: module owner of this driver.
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800779 *
Alan Stern8bb54ab2006-07-01 22:08:49 -0400780 * Registers a USB device driver with the USB core. The list of
781 * unattached devices will be rescanned whenever a new driver is
782 * added, allowing the new driver to attach to any recognized devices.
783 * Returns a negative error code on failure and 0 on success.
784 */
785int usb_register_device_driver(struct usb_device_driver *new_udriver,
786 struct module *owner)
787{
788 int retval = 0;
789
790 if (usb_disabled())
791 return -ENODEV;
792
793 new_udriver->drvwrap.for_devices = 1;
794 new_udriver->drvwrap.driver.name = (char *) new_udriver->name;
795 new_udriver->drvwrap.driver.bus = &usb_bus_type;
796 new_udriver->drvwrap.driver.probe = usb_probe_device;
797 new_udriver->drvwrap.driver.remove = usb_unbind_device;
798 new_udriver->drvwrap.driver.owner = owner;
799
800 retval = driver_register(&new_udriver->drvwrap.driver);
801
802 if (!retval) {
803 pr_info("%s: registered new device driver %s\n",
804 usbcore_name, new_udriver->name);
805 usbfs_update_special();
806 } else {
807 printk(KERN_ERR "%s: error %d registering device "
808 " driver %s\n",
809 usbcore_name, retval, new_udriver->name);
810 }
811
812 return retval;
813}
814EXPORT_SYMBOL_GPL(usb_register_device_driver);
815
816/**
817 * usb_deregister_device_driver - unregister a USB device (not interface) driver
818 * @udriver: USB operations of the device driver to unregister
819 * Context: must be able to sleep
820 *
821 * Unlinks the specified driver from the internal USB driver list.
822 */
823void usb_deregister_device_driver(struct usb_device_driver *udriver)
824{
825 pr_info("%s: deregistering device driver %s\n",
826 usbcore_name, udriver->name);
827
828 driver_unregister(&udriver->drvwrap.driver);
829 usbfs_update_special();
830}
831EXPORT_SYMBOL_GPL(usb_deregister_device_driver);
832
833/**
834 * usb_register_driver - register a USB interface driver
835 * @new_driver: USB operations for the interface driver
836 * @owner: module owner of this driver.
Randy Dunlap892705a2007-02-10 14:41:41 -0800837 * @mod_name: module name string
Alan Stern8bb54ab2006-07-01 22:08:49 -0400838 *
839 * Registers a USB interface driver with the USB core. The list of
840 * unattached interfaces will be rescanned whenever a new driver is
841 * added, allowing the new driver to attach to any recognized interfaces.
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800842 * Returns a negative error code on failure and 0 on success.
843 *
844 * NOTE: if you want your driver to use the USB major number, you must call
845 * usb_register_dev() to enable that functionality. This function no longer
846 * takes care of that.
847 */
Greg Kroah-Hartman80f745f2007-01-15 11:50:02 -0800848int usb_register_driver(struct usb_driver *new_driver, struct module *owner,
849 const char *mod_name)
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800850{
851 int retval = 0;
852
853 if (usb_disabled())
854 return -ENODEV;
855
Alan Stern8bb54ab2006-07-01 22:08:49 -0400856 new_driver->drvwrap.for_devices = 0;
857 new_driver->drvwrap.driver.name = (char *) new_driver->name;
858 new_driver->drvwrap.driver.bus = &usb_bus_type;
859 new_driver->drvwrap.driver.probe = usb_probe_interface;
860 new_driver->drvwrap.driver.remove = usb_unbind_interface;
861 new_driver->drvwrap.driver.owner = owner;
Greg Kroah-Hartman80f745f2007-01-15 11:50:02 -0800862 new_driver->drvwrap.driver.mod_name = mod_name;
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800863 spin_lock_init(&new_driver->dynids.lock);
864 INIT_LIST_HEAD(&new_driver->dynids.list);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800865
Alan Stern8bb54ab2006-07-01 22:08:49 -0400866 retval = driver_register(&new_driver->drvwrap.driver);
CHENG Renquan0c7a2b72009-11-22 01:28:52 +0800867 if (retval)
868 goto out;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800869
CHENG Renquan0c7a2b72009-11-22 01:28:52 +0800870 usbfs_update_special();
871
872 retval = usb_create_newid_file(new_driver);
873 if (retval)
874 goto out_newid;
875
876 retval = usb_create_removeid_file(new_driver);
877 if (retval)
878 goto out_removeid;
879
880 pr_info("%s: registered new interface driver %s\n",
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800881 usbcore_name, new_driver->name);
CHENG Renquan0c7a2b72009-11-22 01:28:52 +0800882
883out:
884 return retval;
885
886out_removeid:
887 usb_remove_newid_file(new_driver);
888out_newid:
889 driver_unregister(&new_driver->drvwrap.driver);
890
891 printk(KERN_ERR "%s: error %d registering interface "
Alan Stern8bb54ab2006-07-01 22:08:49 -0400892 " driver %s\n",
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800893 usbcore_name, retval, new_driver->name);
CHENG Renquan0c7a2b72009-11-22 01:28:52 +0800894 goto out;
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800895}
Greg Kroah-Hartman782e70c2008-01-25 11:12:21 -0600896EXPORT_SYMBOL_GPL(usb_register_driver);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800897
898/**
Alan Stern8bb54ab2006-07-01 22:08:49 -0400899 * usb_deregister - unregister a USB interface driver
900 * @driver: USB operations of the interface driver to unregister
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800901 * Context: must be able to sleep
902 *
903 * Unlinks the specified driver from the internal USB driver list.
904 *
905 * NOTE: If you called usb_register_dev(), you still need to call
906 * usb_deregister_dev() to clean up your driver's allocated minor numbers,
907 * this * call will no longer do it for you.
908 */
909void usb_deregister(struct usb_driver *driver)
910{
Alan Stern8bb54ab2006-07-01 22:08:49 -0400911 pr_info("%s: deregistering interface driver %s\n",
912 usbcore_name, driver->name);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800913
CHENG Renquan0c7a2b72009-11-22 01:28:52 +0800914 usb_remove_removeid_file(driver);
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800915 usb_remove_newid_file(driver);
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800916 usb_free_dynids(driver);
Alan Stern8bb54ab2006-07-01 22:08:49 -0400917 driver_unregister(&driver->drvwrap.driver);
Greg Kroah-Hartmanddae41b2005-11-16 13:41:28 -0800918
919 usbfs_update_special();
920}
Greg Kroah-Hartman782e70c2008-01-25 11:12:21 -0600921EXPORT_SYMBOL_GPL(usb_deregister);
Alan Stern36e56a32006-07-01 22:08:06 -0400922
Alan Stern78d9a482008-06-23 16:00:40 -0400923/* Forced unbinding of a USB interface driver, either because
924 * it doesn't support pre_reset/post_reset/reset_resume or
925 * because it doesn't support suspend/resume.
926 *
927 * The caller must hold @intf's device's lock, but not its pm_mutex
928 * and not @intf->dev.sem.
929 */
930void usb_forced_unbind_intf(struct usb_interface *intf)
931{
932 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
933
934 dev_dbg(&intf->dev, "forced unbind\n");
935 usb_driver_release_interface(driver, intf);
936
937 /* Mark the interface for later rebinding */
938 intf->needs_binding = 1;
939}
940
941/* Delayed forced unbinding of a USB interface driver and scan
942 * for rebinding.
943 *
944 * The caller must hold @intf's device's lock, but not its pm_mutex
945 * and not @intf->dev.sem.
946 *
Alan Stern5096aed2008-08-12 14:34:14 -0400947 * Note: Rebinds will be skipped if a system sleep transition is in
948 * progress and the PM "complete" callback hasn't occurred yet.
Alan Stern78d9a482008-06-23 16:00:40 -0400949 */
950void usb_rebind_intf(struct usb_interface *intf)
951{
952 int rc;
953
954 /* Delayed unbind of an existing driver */
955 if (intf->dev.driver) {
956 struct usb_driver *driver =
957 to_usb_driver(intf->dev.driver);
958
959 dev_dbg(&intf->dev, "forced unbind\n");
960 usb_driver_release_interface(driver, intf);
961 }
962
963 /* Try to rebind the interface */
Alan Stern5096aed2008-08-12 14:34:14 -0400964 if (intf->dev.power.status == DPM_ON) {
965 intf->needs_binding = 0;
966 rc = device_attach(&intf->dev);
967 if (rc < 0)
968 dev_warn(&intf->dev, "rebind failed: %d\n", rc);
969 }
Alan Stern78d9a482008-06-23 16:00:40 -0400970}
971
Alan Stern9ff78432008-08-07 13:04:51 -0400972#ifdef CONFIG_PM
973
Alan Stern78d9a482008-06-23 16:00:40 -0400974#define DO_UNBIND 0
975#define DO_REBIND 1
976
977/* Unbind drivers for @udev's interfaces that don't support suspend/resume,
978 * or rebind interfaces that have been unbound, according to @action.
979 *
980 * The caller must hold @udev's device lock.
Alan Stern78d9a482008-06-23 16:00:40 -0400981 */
982static void do_unbind_rebind(struct usb_device *udev, int action)
983{
984 struct usb_host_config *config;
985 int i;
986 struct usb_interface *intf;
987 struct usb_driver *drv;
988
989 config = udev->actconfig;
990 if (config) {
991 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
992 intf = config->interface[i];
993 switch (action) {
994 case DO_UNBIND:
995 if (intf->dev.driver) {
996 drv = to_usb_driver(intf->dev.driver);
997 if (!drv->suspend || !drv->resume)
998 usb_forced_unbind_intf(intf);
999 }
1000 break;
1001 case DO_REBIND:
Alan Stern5096aed2008-08-12 14:34:14 -04001002 if (intf->needs_binding)
Alan Stern78d9a482008-06-23 16:00:40 -04001003 usb_rebind_intf(intf);
Alan Stern78d9a482008-06-23 16:00:40 -04001004 break;
1005 }
1006 }
1007 }
1008}
1009
Stephen Hemmingerd5ec1682006-11-14 10:06:17 -08001010static int usb_suspend_device(struct usb_device *udev, pm_message_t msg)
Alan Stern36e56a32006-07-01 22:08:06 -04001011{
Alan Stern782da722006-07-01 22:09:35 -04001012 struct usb_device_driver *udriver;
Alan Stern2bf40862006-07-01 22:12:19 -04001013 int status = 0;
Alan Stern36e56a32006-07-01 22:08:06 -04001014
Alan Stern114b3682006-07-01 22:13:04 -04001015 if (udev->state == USB_STATE_NOTATTACHED ||
1016 udev->state == USB_STATE_SUSPENDED)
1017 goto done;
1018
Alan Sternb6f64362007-05-04 11:51:54 -04001019 /* For devices that don't have a driver, we do a generic suspend. */
1020 if (udev->dev.driver)
1021 udriver = to_usb_device_driver(udev->dev.driver);
1022 else {
Alan Stern645daaa2006-08-30 15:47:02 -04001023 udev->do_remote_wakeup = 0;
Alan Sternb6f64362007-05-04 11:51:54 -04001024 udriver = &usb_generic_driver;
Alan Stern1c5df7e2006-07-01 22:13:50 -04001025 }
Alan Stern2bf40862006-07-01 22:12:19 -04001026 status = udriver->suspend(udev, msg);
1027
Alan Stern20dfdad2007-05-22 11:50:17 -04001028 done:
Harvey Harrison441b62c2008-03-03 16:08:34 -08001029 dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
Alan Stern2bf40862006-07-01 22:12:19 -04001030 return status;
Alan Stern1cc8a252006-07-01 22:10:15 -04001031}
Alan Stern36e56a32006-07-01 22:08:06 -04001032
Alan Stern65bfd292008-11-25 16:39:18 -05001033static int usb_resume_device(struct usb_device *udev, pm_message_t msg)
Alan Stern1cc8a252006-07-01 22:10:15 -04001034{
1035 struct usb_device_driver *udriver;
Alan Stern2bf40862006-07-01 22:12:19 -04001036 int status = 0;
Alan Stern1cc8a252006-07-01 22:10:15 -04001037
Alan Stern0458d5b2007-05-04 11:52:20 -04001038 if (udev->state == USB_STATE_NOTATTACHED)
1039 goto done;
Alan Stern1cc8a252006-07-01 22:10:15 -04001040
Alan Stern1c5df7e2006-07-01 22:13:50 -04001041 /* Can't resume it if it doesn't have a driver. */
1042 if (udev->dev.driver == NULL) {
1043 status = -ENOTCONN;
Alan Stern2bf40862006-07-01 22:12:19 -04001044 goto done;
Alan Stern1c5df7e2006-07-01 22:13:50 -04001045 }
1046
Alan Stern6d19c002010-02-12 12:21:11 +01001047 /* Non-root devices on a full/low-speed bus must wait for their
1048 * companion high-speed root hub, in case a handoff is needed.
1049 */
1050 if (!(msg.event & PM_EVENT_AUTO) && udev->parent &&
1051 udev->bus->hs_companion)
1052 device_pm_wait_for_dev(&udev->dev,
1053 &udev->bus->hs_companion->root_hub->dev);
1054
Alan Stern6bc6cff2007-05-04 11:53:03 -04001055 if (udev->quirks & USB_QUIRK_RESET_RESUME)
1056 udev->reset_resume = 1;
1057
Alan Stern1cc8a252006-07-01 22:10:15 -04001058 udriver = to_usb_device_driver(udev->dev.driver);
Alan Stern65bfd292008-11-25 16:39:18 -05001059 status = udriver->resume(udev, msg);
Alan Stern2bf40862006-07-01 22:12:19 -04001060
Alan Stern20dfdad2007-05-22 11:50:17 -04001061 done:
Harvey Harrison441b62c2008-03-03 16:08:34 -08001062 dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
Alan Stern2bf40862006-07-01 22:12:19 -04001063 return status;
Alan Stern1cc8a252006-07-01 22:10:15 -04001064}
1065
Alan Stern65605ae2008-08-12 14:33:27 -04001066static int usb_suspend_interface(struct usb_device *udev,
1067 struct usb_interface *intf, pm_message_t msg)
Alan Stern1cc8a252006-07-01 22:10:15 -04001068{
1069 struct usb_driver *driver;
Alan Stern2bf40862006-07-01 22:12:19 -04001070 int status = 0;
Alan Stern1cc8a252006-07-01 22:10:15 -04001071
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001072 if (udev->state == USB_STATE_NOTATTACHED ||
1073 intf->condition == USB_INTERFACE_UNBOUND)
Alan Stern2bf40862006-07-01 22:12:19 -04001074 goto done;
Alan Stern1cc8a252006-07-01 22:10:15 -04001075 driver = to_usb_driver(intf->dev.driver);
Alan Stern36e56a32006-07-01 22:08:06 -04001076
Alan Stern78d9a482008-06-23 16:00:40 -04001077 if (driver->suspend) {
Alan Stern1cc8a252006-07-01 22:10:15 -04001078 status = driver->suspend(intf, msg);
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001079 if (status && !(msg.event & PM_EVENT_AUTO))
Alan Stern1cc8a252006-07-01 22:10:15 -04001080 dev_err(&intf->dev, "%s error %d\n",
1081 "suspend", status);
Alan Stern36e56a32006-07-01 22:08:06 -04001082 } else {
Alan Stern78d9a482008-06-23 16:00:40 -04001083 /* Later we will unbind the driver and reprobe */
1084 intf->needs_binding = 1;
1085 dev_warn(&intf->dev, "no %s for driver %s?\n",
1086 "suspend", driver->name);
Alan Stern36e56a32006-07-01 22:08:06 -04001087 }
Alan Stern2bf40862006-07-01 22:12:19 -04001088
Alan Stern20dfdad2007-05-22 11:50:17 -04001089 done:
Harvey Harrison441b62c2008-03-03 16:08:34 -08001090 dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
Alan Stern36e56a32006-07-01 22:08:06 -04001091 return status;
1092}
1093
Alan Stern65605ae2008-08-12 14:33:27 -04001094static int usb_resume_interface(struct usb_device *udev,
Alan Stern65bfd292008-11-25 16:39:18 -05001095 struct usb_interface *intf, pm_message_t msg, int reset_resume)
Alan Stern36e56a32006-07-01 22:08:06 -04001096{
Alan Stern1cc8a252006-07-01 22:10:15 -04001097 struct usb_driver *driver;
Alan Stern2bf40862006-07-01 22:12:19 -04001098 int status = 0;
Alan Stern36e56a32006-07-01 22:08:06 -04001099
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001100 if (udev->state == USB_STATE_NOTATTACHED)
Alan Stern2bf40862006-07-01 22:12:19 -04001101 goto done;
Alan Stern36e56a32006-07-01 22:08:06 -04001102
Alan Stern645daaa2006-08-30 15:47:02 -04001103 /* Don't let autoresume interfere with unbinding */
1104 if (intf->condition == USB_INTERFACE_UNBINDING)
1105 goto done;
1106
Alan Stern1c5df7e2006-07-01 22:13:50 -04001107 /* Can't resume it if it doesn't have a driver. */
Alan Stern55151d72008-08-12 14:33:59 -04001108 if (intf->condition == USB_INTERFACE_UNBOUND) {
1109
1110 /* Carry out a deferred switch to altsetting 0 */
1111 if (intf->needs_altsetting0 &&
1112 intf->dev.power.status == DPM_ON) {
1113 usb_set_interface(udev, intf->altsetting[0].
1114 desc.bInterfaceNumber, 0);
1115 intf->needs_altsetting0 = 0;
1116 }
Alan Stern2bf40862006-07-01 22:12:19 -04001117 goto done;
Alan Stern55151d72008-08-12 14:33:59 -04001118 }
Alan Stern78d9a482008-06-23 16:00:40 -04001119
1120 /* Don't resume if the interface is marked for rebinding */
1121 if (intf->needs_binding)
1122 goto done;
Alan Stern1cc8a252006-07-01 22:10:15 -04001123 driver = to_usb_driver(intf->dev.driver);
Alan Stern36e56a32006-07-01 22:08:06 -04001124
Alan Sternf07600c2007-05-30 15:38:16 -04001125 if (reset_resume) {
1126 if (driver->reset_resume) {
1127 status = driver->reset_resume(intf);
1128 if (status)
1129 dev_err(&intf->dev, "%s error %d\n",
1130 "reset_resume", status);
1131 } else {
Alan Stern78d9a482008-06-23 16:00:40 -04001132 intf->needs_binding = 1;
Alan Sternf07600c2007-05-30 15:38:16 -04001133 dev_warn(&intf->dev, "no %s for driver %s?\n",
1134 "reset_resume", driver->name);
1135 }
1136 } else {
1137 if (driver->resume) {
1138 status = driver->resume(intf);
1139 if (status)
1140 dev_err(&intf->dev, "%s error %d\n",
1141 "resume", status);
1142 } else {
Alan Stern78d9a482008-06-23 16:00:40 -04001143 intf->needs_binding = 1;
Alan Sternf07600c2007-05-30 15:38:16 -04001144 dev_warn(&intf->dev, "no %s for driver %s?\n",
1145 "resume", driver->name);
1146 }
1147 }
Alan Stern2bf40862006-07-01 22:12:19 -04001148
1149done:
Harvey Harrison441b62c2008-03-03 16:08:34 -08001150 dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status);
Alan Sternf07600c2007-05-30 15:38:16 -04001151
Alan Stern78d9a482008-06-23 16:00:40 -04001152 /* Later we will unbind the driver and/or reprobe, if necessary */
Alan Stern2bf40862006-07-01 22:12:19 -04001153 return status;
Alan Stern36e56a32006-07-01 22:08:06 -04001154}
1155
Alan Stern645daaa2006-08-30 15:47:02 -04001156/**
1157 * usb_suspend_both - suspend a USB device and its interfaces
1158 * @udev: the usb_device to suspend
1159 * @msg: Power Management message describing this state transition
1160 *
1161 * This is the central routine for suspending USB devices. It calls the
1162 * suspend methods for all the interface drivers in @udev and then calls
1163 * the suspend method for @udev itself. If an error occurs at any stage,
1164 * all the interfaces which were suspended are resumed so that they remain
1165 * in the same state as the device.
1166 *
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001167 * Autosuspend requests originating from a child device or an interface
1168 * driver may be made without the protection of @udev's device lock, but
1169 * all other suspend calls will hold the lock. Usbcore will insure that
1170 * method calls do not arrive during bind, unbind, or reset operations.
1171 * However drivers must be prepared to handle suspend calls arriving at
1172 * unpredictable times.
Alan Stern645daaa2006-08-30 15:47:02 -04001173 *
1174 * This routine can run only in process context.
1175 */
Alan Stern718efa62007-03-09 15:41:13 -05001176static int usb_suspend_both(struct usb_device *udev, pm_message_t msg)
Alan Sterna8e7c562006-07-01 22:11:02 -04001177{
1178 int status = 0;
Alan Stern571dc792010-04-09 16:03:43 -04001179 int i = 0, n = 0;
Alan Sterna8e7c562006-07-01 22:11:02 -04001180 struct usb_interface *intf;
1181
Alan Stern19410442007-03-27 13:33:59 -04001182 if (udev->state == USB_STATE_NOTATTACHED ||
1183 udev->state == USB_STATE_SUSPENDED)
1184 goto done;
Alan Stern645daaa2006-08-30 15:47:02 -04001185
Alan Stern645daaa2006-08-30 15:47:02 -04001186 /* Suspend all the interfaces and then udev itself */
Alan Sterna8e7c562006-07-01 22:11:02 -04001187 if (udev->actconfig) {
Alan Stern571dc792010-04-09 16:03:43 -04001188 n = udev->actconfig->desc.bNumInterfaces;
1189 for (i = n - 1; i >= 0; --i) {
Alan Sterna8e7c562006-07-01 22:11:02 -04001190 intf = udev->actconfig->interface[i];
Alan Stern65605ae2008-08-12 14:33:27 -04001191 status = usb_suspend_interface(udev, intf, msg);
Alan Sterna8e7c562006-07-01 22:11:02 -04001192 if (status != 0)
1193 break;
1194 }
1195 }
Alan Stern5ad4f712007-09-10 11:31:43 -04001196 if (status == 0)
Stephen Hemmingerd5ec1682006-11-14 10:06:17 -08001197 status = usb_suspend_device(udev, msg);
Alan Sterna8e7c562006-07-01 22:11:02 -04001198
1199 /* If the suspend failed, resume interfaces that did get suspended */
1200 if (status != 0) {
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001201 msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME);
Alan Stern571dc792010-04-09 16:03:43 -04001202 while (++i < n) {
Alan Sterna8e7c562006-07-01 22:11:02 -04001203 intf = udev->actconfig->interface[i];
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001204 usb_resume_interface(udev, intf, msg, 0);
Alan Sterna8e7c562006-07-01 22:11:02 -04001205 }
Alan Stern645daaa2006-08-30 15:47:02 -04001206
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001207 /* If the suspend succeeded then prevent any more URB submissions
1208 * and flush any outstanding URBs.
Alan Stern6840d252007-09-10 11:34:26 -04001209 */
Alan Sternef7f6c72007-04-05 16:03:49 -04001210 } else {
Alan Stern6840d252007-09-10 11:34:26 -04001211 udev->can_submit = 0;
1212 for (i = 0; i < 16; ++i) {
1213 usb_hcd_flush_endpoint(udev, udev->ep_out[i]);
1214 usb_hcd_flush_endpoint(udev, udev->ep_in[i]);
1215 }
Alan Sternef7f6c72007-04-05 16:03:49 -04001216 }
Alan Stern645daaa2006-08-30 15:47:02 -04001217
Alan Stern19410442007-03-27 13:33:59 -04001218 done:
Harvey Harrison441b62c2008-03-03 16:08:34 -08001219 dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
Alan Sterna8e7c562006-07-01 22:11:02 -04001220 return status;
1221}
1222
Alan Stern645daaa2006-08-30 15:47:02 -04001223/**
1224 * usb_resume_both - resume a USB device and its interfaces
1225 * @udev: the usb_device to resume
Alan Stern65bfd292008-11-25 16:39:18 -05001226 * @msg: Power Management message describing this state transition
Alan Stern645daaa2006-08-30 15:47:02 -04001227 *
1228 * This is the central routine for resuming USB devices. It calls the
1229 * the resume method for @udev and then calls the resume methods for all
1230 * the interface drivers in @udev.
1231 *
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001232 * Autoresume requests originating from a child device or an interface
1233 * driver may be made without the protection of @udev's device lock, but
1234 * all other resume calls will hold the lock. Usbcore will insure that
1235 * method calls do not arrive during bind, unbind, or reset operations.
1236 * However drivers must be prepared to handle resume calls arriving at
1237 * unpredictable times.
Alan Stern645daaa2006-08-30 15:47:02 -04001238 *
1239 * This routine can run only in process context.
1240 */
Alan Stern65bfd292008-11-25 16:39:18 -05001241static int usb_resume_both(struct usb_device *udev, pm_message_t msg)
Alan Sterna8e7c562006-07-01 22:11:02 -04001242{
Alan Stern645daaa2006-08-30 15:47:02 -04001243 int status = 0;
Alan Sterna8e7c562006-07-01 22:11:02 -04001244 int i;
1245 struct usb_interface *intf;
1246
Alan Stern19410442007-03-27 13:33:59 -04001247 if (udev->state == USB_STATE_NOTATTACHED) {
1248 status = -ENODEV;
1249 goto done;
1250 }
Alan Stern6840d252007-09-10 11:34:26 -04001251 udev->can_submit = 1;
Alan Stern645daaa2006-08-30 15:47:02 -04001252
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001253 /* Resume the device */
1254 if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume)
Alan Stern65bfd292008-11-25 16:39:18 -05001255 status = usb_resume_device(udev, msg);
Alan Stern114b3682006-07-01 22:13:04 -04001256
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001257 /* Resume the interfaces */
Alan Sterna8e7c562006-07-01 22:11:02 -04001258 if (status == 0 && udev->actconfig) {
1259 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1260 intf = udev->actconfig->interface[i];
Alan Stern65bfd292008-11-25 16:39:18 -05001261 usb_resume_interface(udev, intf, msg,
1262 udev->reset_resume);
Alan Sterna8e7c562006-07-01 22:11:02 -04001263 }
1264 }
Alan Stern645daaa2006-08-30 15:47:02 -04001265
Alan Stern19410442007-03-27 13:33:59 -04001266 done:
Harvey Harrison441b62c2008-03-03 16:08:34 -08001267 dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status);
Alan Stern70a1c9e2008-03-06 17:00:58 -05001268 if (!status)
1269 udev->reset_resume = 0;
Alan Sterna8e7c562006-07-01 22:11:02 -04001270 return status;
1271}
1272
Alan Stern5f677f12010-04-02 13:20:11 -04001273static void choose_wakeup(struct usb_device *udev, pm_message_t msg)
1274{
1275 int w, i;
1276 struct usb_interface *intf;
1277
1278 /* Remote wakeup is needed only when we actually go to sleep.
1279 * For things like FREEZE and QUIESCE, if the device is already
1280 * autosuspended then its current wakeup setting is okay.
1281 */
1282 if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) {
1283 if (udev->state != USB_STATE_SUSPENDED)
1284 udev->do_remote_wakeup = 0;
1285 return;
1286 }
1287
1288 /* If remote wakeup is permitted, see whether any interface drivers
1289 * actually want it.
1290 */
1291 w = 0;
1292 if (device_may_wakeup(&udev->dev) && udev->actconfig) {
1293 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1294 intf = udev->actconfig->interface[i];
1295 w |= intf->needs_remote_wakeup;
1296 }
1297 }
1298
1299 /* If the device is autosuspended with the wrong wakeup setting,
1300 * autoresume now so the setting can be changed.
1301 */
1302 if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup)
1303 pm_runtime_resume(&udev->dev);
1304 udev->do_remote_wakeup = w;
1305}
1306
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001307/* The device lock is held by the PM core */
Alan Stern0c590e22010-01-08 12:57:14 -05001308int usb_suspend(struct device *dev, pm_message_t msg)
1309{
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001310 struct usb_device *udev = to_usb_device(dev);
Alan Stern0c590e22010-01-08 12:57:14 -05001311
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001312 do_unbind_rebind(udev, DO_UNBIND);
Alan Stern5f677f12010-04-02 13:20:11 -04001313 choose_wakeup(udev, msg);
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001314 return usb_suspend_both(udev, msg);
Alan Stern0c590e22010-01-08 12:57:14 -05001315}
1316
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001317/* The device lock is held by the PM core */
Alan Stern0c590e22010-01-08 12:57:14 -05001318int usb_resume(struct device *dev, pm_message_t msg)
1319{
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001320 struct usb_device *udev = to_usb_device(dev);
Alan Stern0c590e22010-01-08 12:57:14 -05001321 int status;
1322
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001323 /* For PM complete calls, all we do is rebind interfaces */
1324 if (msg.event == PM_EVENT_ON) {
1325 if (udev->state != USB_STATE_NOTATTACHED)
1326 do_unbind_rebind(udev, DO_REBIND);
1327 status = 0;
Alan Stern0c590e22010-01-08 12:57:14 -05001328
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001329 /* For all other calls, take the device back to full power and
1330 * tell the PM core in case it was autosuspended previously.
Alan Sternc043f122010-06-04 14:02:42 -04001331 * Unbind the interfaces that will need rebinding later.
Alan Stern0c590e22010-01-08 12:57:14 -05001332 */
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001333 } else {
1334 status = usb_resume_both(udev, msg);
1335 if (status == 0) {
1336 pm_runtime_disable(dev);
1337 pm_runtime_set_active(dev);
1338 pm_runtime_enable(dev);
1339 udev->last_busy = jiffies;
Alan Sternc043f122010-06-04 14:02:42 -04001340 do_unbind_rebind(udev, DO_REBIND);
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001341 }
1342 }
Alan Stern0c590e22010-01-08 12:57:14 -05001343
1344 /* Avoid PM error messages for devices disconnected while suspended
1345 * as we'll display regular disconnect messages just a bit later.
1346 */
1347 if (status == -ENODEV)
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001348 status = 0;
Alan Stern0c590e22010-01-08 12:57:14 -05001349 return status;
1350}
1351
1352#endif /* CONFIG_PM */
1353
Alan Stern645daaa2006-08-30 15:47:02 -04001354#ifdef CONFIG_USB_SUSPEND
1355
Alan Stern088f7fe2010-01-08 12:56:54 -05001356/**
1357 * usb_enable_autosuspend - allow a USB device to be autosuspended
1358 * @udev: the USB device which may be autosuspended
1359 *
1360 * This routine allows @udev to be autosuspended. An autosuspend won't
1361 * take place until the autosuspend_delay has elapsed and all the other
1362 * necessary conditions are satisfied.
1363 *
1364 * The caller must hold @udev's device lock.
1365 */
Alan Stern9e18c822010-04-02 13:22:09 -04001366void usb_enable_autosuspend(struct usb_device *udev)
Alan Stern088f7fe2010-01-08 12:56:54 -05001367{
Alan Stern9e18c822010-04-02 13:22:09 -04001368 pm_runtime_allow(&udev->dev);
Alan Stern088f7fe2010-01-08 12:56:54 -05001369}
1370EXPORT_SYMBOL_GPL(usb_enable_autosuspend);
1371
1372/**
1373 * usb_disable_autosuspend - prevent a USB device from being autosuspended
1374 * @udev: the USB device which may not be autosuspended
1375 *
1376 * This routine prevents @udev from being autosuspended and wakes it up
1377 * if it is already autosuspended.
1378 *
1379 * The caller must hold @udev's device lock.
1380 */
Alan Stern9e18c822010-04-02 13:22:09 -04001381void usb_disable_autosuspend(struct usb_device *udev)
Alan Stern088f7fe2010-01-08 12:56:54 -05001382{
Alan Stern9e18c822010-04-02 13:22:09 -04001383 pm_runtime_forbid(&udev->dev);
Alan Stern088f7fe2010-01-08 12:56:54 -05001384}
1385EXPORT_SYMBOL_GPL(usb_disable_autosuspend);
1386
Alan Stern645daaa2006-08-30 15:47:02 -04001387/**
1388 * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces
Henrik Kretzschmar701f35a2006-09-25 17:00:56 -07001389 * @udev: the usb_device to autosuspend
Alan Stern645daaa2006-08-30 15:47:02 -04001390 *
1391 * This routine should be called when a core subsystem is finished using
1392 * @udev and wants to allow it to autosuspend. Examples would be when
1393 * @udev's device file in usbfs is closed or after a configuration change.
1394 *
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001395 * @udev's usage counter is decremented; if it drops to 0 and all the
1396 * interfaces are inactive then a delayed autosuspend will be attempted.
1397 * The attempt may fail (see autosuspend_check()).
Alan Stern645daaa2006-08-30 15:47:02 -04001398 *
Alan Stern62e299e2010-01-08 12:56:19 -05001399 * The caller must hold @udev's device lock.
Alan Stern645daaa2006-08-30 15:47:02 -04001400 *
1401 * This routine can run only in process context.
1402 */
Alan Stern94fcda12006-11-20 11:38:46 -05001403void usb_autosuspend_device(struct usb_device *udev)
Alan Stern645daaa2006-08-30 15:47:02 -04001404{
Alan Stern94fcda12006-11-20 11:38:46 -05001405 int status;
1406
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001407 udev->last_busy = jiffies;
1408 status = pm_runtime_put_sync(&udev->dev);
1409 dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
1410 __func__, atomic_read(&udev->dev.power.usage_count),
1411 status);
Alan Stern645daaa2006-08-30 15:47:02 -04001412}
1413
1414/**
Alan Stern19c26232007-02-20 15:03:32 -05001415 * usb_try_autosuspend_device - attempt an autosuspend of a USB device and its interfaces
1416 * @udev: the usb_device to autosuspend
1417 *
1418 * This routine should be called when a core subsystem thinks @udev may
1419 * be ready to autosuspend.
1420 *
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001421 * @udev's usage counter left unchanged. If it is 0 and all the interfaces
1422 * are inactive then an autosuspend will be attempted. The attempt may
1423 * fail or be delayed.
Alan Stern19c26232007-02-20 15:03:32 -05001424 *
Alan Stern62e299e2010-01-08 12:56:19 -05001425 * The caller must hold @udev's device lock.
1426 *
Alan Stern19c26232007-02-20 15:03:32 -05001427 * This routine can run only in process context.
1428 */
1429void usb_try_autosuspend_device(struct usb_device *udev)
1430{
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001431 int status;
1432
1433 status = pm_runtime_idle(&udev->dev);
1434 dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
1435 __func__, atomic_read(&udev->dev.power.usage_count),
1436 status);
Alan Stern19c26232007-02-20 15:03:32 -05001437}
1438
1439/**
Alan Stern645daaa2006-08-30 15:47:02 -04001440 * usb_autoresume_device - immediately autoresume a USB device and its interfaces
Henrik Kretzschmar701f35a2006-09-25 17:00:56 -07001441 * @udev: the usb_device to autoresume
Alan Stern645daaa2006-08-30 15:47:02 -04001442 *
1443 * This routine should be called when a core subsystem wants to use @udev
Alan Stern94fcda12006-11-20 11:38:46 -05001444 * and needs to guarantee that it is not suspended. No autosuspend will
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001445 * occur until usb_autosuspend_device() is called. (Note that this will
1446 * not prevent suspend events originating in the PM core.) Examples would
1447 * be when @udev's device file in usbfs is opened or when a remote-wakeup
Alan Stern94fcda12006-11-20 11:38:46 -05001448 * request is received.
Alan Stern645daaa2006-08-30 15:47:02 -04001449 *
Alan Stern94fcda12006-11-20 11:38:46 -05001450 * @udev's usage counter is incremented to prevent subsequent autosuspends.
1451 * However if the autoresume fails then the usage counter is re-decremented.
Alan Stern645daaa2006-08-30 15:47:02 -04001452 *
Alan Stern62e299e2010-01-08 12:56:19 -05001453 * The caller must hold @udev's device lock.
Alan Stern645daaa2006-08-30 15:47:02 -04001454 *
1455 * This routine can run only in process context.
1456 */
Alan Stern94fcda12006-11-20 11:38:46 -05001457int usb_autoresume_device(struct usb_device *udev)
Alan Stern645daaa2006-08-30 15:47:02 -04001458{
1459 int status;
1460
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001461 status = pm_runtime_get_sync(&udev->dev);
1462 if (status < 0)
1463 pm_runtime_put_sync(&udev->dev);
1464 dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n",
1465 __func__, atomic_read(&udev->dev.power.usage_count),
1466 status);
1467 if (status > 0)
1468 status = 0;
Alan Sternaf4f7602006-10-30 17:06:45 -05001469 return status;
1470}
1471
Alan Stern645daaa2006-08-30 15:47:02 -04001472/**
1473 * usb_autopm_put_interface - decrement a USB interface's PM-usage counter
Henrik Kretzschmar701f35a2006-09-25 17:00:56 -07001474 * @intf: the usb_interface whose counter should be decremented
Alan Stern645daaa2006-08-30 15:47:02 -04001475 *
1476 * This routine should be called by an interface driver when it is
1477 * finished using @intf and wants to allow it to autosuspend. A typical
1478 * example would be a character-device driver when its device file is
1479 * closed.
1480 *
1481 * The routine decrements @intf's usage counter. When the counter reaches
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001482 * 0, a delayed autosuspend request for @intf's device is attempted. The
1483 * attempt may fail (see autosuspend_check()).
Alan Stern645daaa2006-08-30 15:47:02 -04001484 *
Alan Stern645daaa2006-08-30 15:47:02 -04001485 * This routine can run only in process context.
1486 */
1487void usb_autopm_put_interface(struct usb_interface *intf)
1488{
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001489 struct usb_device *udev = interface_to_usbdev(intf);
1490 int status;
Alan Stern645daaa2006-08-30 15:47:02 -04001491
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001492 udev->last_busy = jiffies;
1493 atomic_dec(&intf->pm_usage_cnt);
1494 status = pm_runtime_put_sync(&intf->dev);
1495 dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
1496 __func__, atomic_read(&intf->dev.power.usage_count),
1497 status);
Alan Stern645daaa2006-08-30 15:47:02 -04001498}
1499EXPORT_SYMBOL_GPL(usb_autopm_put_interface);
1500
1501/**
Alan Stern9ac39f22008-11-12 16:19:49 -05001502 * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
1503 * @intf: the usb_interface whose counter should be decremented
1504 *
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001505 * This routine does much the same thing as usb_autopm_put_interface():
1506 * It decrements @intf's usage counter and schedules a delayed
1507 * autosuspend request if the counter is <= 0. The difference is that it
1508 * does not perform any synchronization; callers should hold a private
1509 * lock and handle all synchronization issues themselves.
Alan Stern9ac39f22008-11-12 16:19:49 -05001510 *
1511 * Typically a driver would call this routine during an URB's completion
1512 * handler, if no more URBs were pending.
1513 *
1514 * This routine can run in atomic context.
1515 */
1516void usb_autopm_put_interface_async(struct usb_interface *intf)
1517{
1518 struct usb_device *udev = interface_to_usbdev(intf);
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001519 unsigned long last_busy;
Alan Stern9ac39f22008-11-12 16:19:49 -05001520 int status = 0;
1521
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001522 last_busy = udev->last_busy;
1523 udev->last_busy = jiffies;
1524 atomic_dec(&intf->pm_usage_cnt);
1525 pm_runtime_put_noidle(&intf->dev);
1526
Alan Stern9e18c822010-04-02 13:22:09 -04001527 if (udev->dev.power.runtime_auto) {
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001528 /* Optimization: Don't schedule a delayed autosuspend if
1529 * the timer is already running and the expiration time
1530 * wouldn't change.
1531 *
1532 * We have to use the interface's timer. Attempts to
1533 * schedule a suspend for the device would fail because
1534 * the interface is still active.
1535 */
1536 if (intf->dev.power.timer_expires == 0 ||
1537 round_jiffies_up(last_busy) !=
1538 round_jiffies_up(jiffies)) {
1539 status = pm_schedule_suspend(&intf->dev,
1540 jiffies_to_msecs(
Alan Stern4ec06d62008-11-25 16:40:02 -05001541 round_jiffies_up_relative(
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001542 udev->autosuspend_delay)));
Alan Stern9ac39f22008-11-12 16:19:49 -05001543 }
1544 }
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001545 dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
1546 __func__, atomic_read(&intf->dev.power.usage_count),
1547 status);
Alan Stern9ac39f22008-11-12 16:19:49 -05001548}
1549EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async);
1550
1551/**
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001552 * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter
1553 * @intf: the usb_interface whose counter should be decremented
1554 *
1555 * This routine decrements @intf's usage counter but does not carry out an
1556 * autosuspend.
1557 *
1558 * This routine can run in atomic context.
1559 */
1560void usb_autopm_put_interface_no_suspend(struct usb_interface *intf)
1561{
1562 struct usb_device *udev = interface_to_usbdev(intf);
1563
1564 udev->last_busy = jiffies;
1565 atomic_dec(&intf->pm_usage_cnt);
1566 pm_runtime_put_noidle(&intf->dev);
1567}
1568EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend);
1569
1570/**
Alan Stern645daaa2006-08-30 15:47:02 -04001571 * usb_autopm_get_interface - increment a USB interface's PM-usage counter
Henrik Kretzschmar701f35a2006-09-25 17:00:56 -07001572 * @intf: the usb_interface whose counter should be incremented
Alan Stern645daaa2006-08-30 15:47:02 -04001573 *
1574 * This routine should be called by an interface driver when it wants to
1575 * use @intf and needs to guarantee that it is not suspended. In addition,
1576 * the routine prevents @intf from being autosuspended subsequently. (Note
1577 * that this will not prevent suspend events originating in the PM core.)
1578 * This prevention will persist until usb_autopm_put_interface() is called
1579 * or @intf is unbound. A typical example would be a character-device
1580 * driver when its device file is opened.
1581 *
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001582 * @intf's usage counter is incremented to prevent subsequent autosuspends.
1583 * However if the autoresume fails then the counter is re-decremented.
Alan Stern645daaa2006-08-30 15:47:02 -04001584 *
1585 * This routine can run only in process context.
1586 */
1587int usb_autopm_get_interface(struct usb_interface *intf)
1588{
Alan Sternaf4f7602006-10-30 17:06:45 -05001589 int status;
Alan Stern645daaa2006-08-30 15:47:02 -04001590
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001591 status = pm_runtime_get_sync(&intf->dev);
1592 if (status < 0)
1593 pm_runtime_put_sync(&intf->dev);
1594 else
1595 atomic_inc(&intf->pm_usage_cnt);
1596 dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
1597 __func__, atomic_read(&intf->dev.power.usage_count),
1598 status);
1599 if (status > 0)
1600 status = 0;
Alan Stern645daaa2006-08-30 15:47:02 -04001601 return status;
1602}
1603EXPORT_SYMBOL_GPL(usb_autopm_get_interface);
1604
Alan Stern692a1862006-10-30 17:07:51 -05001605/**
Alan Stern9ac39f22008-11-12 16:19:49 -05001606 * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter
1607 * @intf: the usb_interface whose counter should be incremented
1608 *
1609 * This routine does much the same thing as
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001610 * usb_autopm_get_interface(): It increments @intf's usage counter and
1611 * queues an autoresume request if the device is suspended. The
1612 * differences are that it does not perform any synchronization (callers
1613 * should hold a private lock and handle all synchronization issues
1614 * themselves), and it does not autoresume the device directly (it only
1615 * queues a request). After a successful call, the device may not yet be
1616 * resumed.
Alan Stern9ac39f22008-11-12 16:19:49 -05001617 *
1618 * This routine can run in atomic context.
1619 */
1620int usb_autopm_get_interface_async(struct usb_interface *intf)
1621{
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001622 int status = 0;
1623 enum rpm_status s;
Alan Stern9ac39f22008-11-12 16:19:49 -05001624
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001625 /* Don't request a resume unless the interface is already suspending
1626 * or suspended. Doing so would force a running suspend timer to be
1627 * cancelled.
1628 */
1629 pm_runtime_get_noresume(&intf->dev);
1630 s = ACCESS_ONCE(intf->dev.power.runtime_status);
1631 if (s == RPM_SUSPENDING || s == RPM_SUSPENDED)
1632 status = pm_request_resume(&intf->dev);
1633
1634 if (status < 0 && status != -EINPROGRESS)
1635 pm_runtime_put_noidle(&intf->dev);
1636 else
Alan Sternccf5b802009-06-29 11:00:01 -04001637 atomic_inc(&intf->pm_usage_cnt);
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001638 dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n",
1639 __func__, atomic_read(&intf->dev.power.usage_count),
1640 status);
1641 if (status > 0)
1642 status = 0;
Alan Stern9ac39f22008-11-12 16:19:49 -05001643 return status;
1644}
1645EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async);
1646
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001647/**
1648 * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter
1649 * @intf: the usb_interface whose counter should be incremented
1650 *
1651 * This routine increments @intf's usage counter but does not carry out an
1652 * autoresume.
1653 *
1654 * This routine can run in atomic context.
1655 */
1656void usb_autopm_get_interface_no_resume(struct usb_interface *intf)
1657{
1658 struct usb_device *udev = interface_to_usbdev(intf);
1659
1660 udev->last_busy = jiffies;
1661 atomic_inc(&intf->pm_usage_cnt);
1662 pm_runtime_get_noresume(&intf->dev);
1663}
1664EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume);
1665
1666/* Internal routine to check whether we may autosuspend a device. */
1667static int autosuspend_check(struct usb_device *udev)
1668{
Alan Stern7560d32e2010-04-02 13:18:50 -04001669 int w, i;
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001670 struct usb_interface *intf;
1671 unsigned long suspend_time, j;
1672
1673 /* Fail if autosuspend is disabled, or any interfaces are in use, or
1674 * any interface drivers require remote wakeup but it isn't available.
1675 */
Alan Stern7560d32e2010-04-02 13:18:50 -04001676 w = 0;
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001677 if (udev->actconfig) {
1678 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
1679 intf = udev->actconfig->interface[i];
1680
1681 /* We don't need to check interfaces that are
1682 * disabled for runtime PM. Either they are unbound
1683 * or else their drivers don't support autosuspend
1684 * and so they are permanently active.
1685 */
1686 if (intf->dev.power.disable_depth)
1687 continue;
1688 if (atomic_read(&intf->dev.power.usage_count) > 0)
1689 return -EBUSY;
Alan Stern7560d32e2010-04-02 13:18:50 -04001690 w |= intf->needs_remote_wakeup;
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001691
1692 /* Don't allow autosuspend if the device will need
1693 * a reset-resume and any of its interface drivers
1694 * doesn't include support or needs remote wakeup.
1695 */
1696 if (udev->quirks & USB_QUIRK_RESET_RESUME) {
1697 struct usb_driver *driver;
1698
1699 driver = to_usb_driver(intf->dev.driver);
1700 if (!driver->reset_resume ||
1701 intf->needs_remote_wakeup)
1702 return -EOPNOTSUPP;
1703 }
1704 }
1705 }
Alan Stern7560d32e2010-04-02 13:18:50 -04001706 if (w && !device_can_wakeup(&udev->dev)) {
1707 dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n");
1708 return -EOPNOTSUPP;
1709 }
1710 udev->do_remote_wakeup = w;
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001711
1712 /* If everything is okay but the device hasn't been idle for long
1713 * enough, queue a delayed autosuspend request.
1714 */
1715 j = ACCESS_ONCE(jiffies);
1716 suspend_time = udev->last_busy + udev->autosuspend_delay;
1717 if (time_before(j, suspend_time)) {
1718 pm_schedule_suspend(&udev->dev, jiffies_to_msecs(
1719 round_jiffies_up_relative(suspend_time - j)));
1720 return -EAGAIN;
1721 }
1722 return 0;
1723}
1724
1725static int usb_runtime_suspend(struct device *dev)
1726{
1727 int status = 0;
1728
1729 /* A USB device can be suspended if it passes the various autosuspend
1730 * checks. Runtime suspend for a USB device means suspending all the
1731 * interfaces and then the device itself.
1732 */
1733 if (is_usb_device(dev)) {
1734 struct usb_device *udev = to_usb_device(dev);
1735
1736 if (autosuspend_check(udev) != 0)
1737 return -EAGAIN;
1738
1739 status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND);
1740
1741 /* If an interface fails the suspend, adjust the last_busy
1742 * time so that we don't get another suspend attempt right
1743 * away.
1744 */
1745 if (status) {
1746 udev->last_busy = jiffies +
1747 (udev->autosuspend_delay == 0 ?
1748 HZ/2 : 0);
1749 }
1750
1751 /* Prevent the parent from suspending immediately after */
1752 else if (udev->parent) {
1753 udev->parent->last_busy = jiffies;
1754 }
1755 }
1756
1757 /* Runtime suspend for a USB interface doesn't mean anything. */
1758 return status;
1759}
1760
1761static int usb_runtime_resume(struct device *dev)
1762{
1763 /* Runtime resume for a USB device means resuming both the device
1764 * and all its interfaces.
1765 */
1766 if (is_usb_device(dev)) {
1767 struct usb_device *udev = to_usb_device(dev);
1768 int status;
1769
1770 status = usb_resume_both(udev, PMSG_AUTO_RESUME);
1771 udev->last_busy = jiffies;
1772 return status;
1773 }
1774
1775 /* Runtime resume for a USB interface doesn't mean anything. */
1776 return 0;
1777}
1778
1779static int usb_runtime_idle(struct device *dev)
1780{
1781 /* An idle USB device can be suspended if it passes the various
1782 * autosuspend checks. An idle interface can be suspended at
1783 * any time.
1784 */
1785 if (is_usb_device(dev)) {
1786 struct usb_device *udev = to_usb_device(dev);
1787
1788 if (autosuspend_check(udev) != 0)
1789 return 0;
1790 }
1791
1792 pm_runtime_suspend(dev);
1793 return 0;
1794}
1795
1796static struct dev_pm_ops usb_bus_pm_ops = {
1797 .runtime_suspend = usb_runtime_suspend,
1798 .runtime_resume = usb_runtime_resume,
1799 .runtime_idle = usb_runtime_idle,
1800};
1801
Alan Stern718efa62007-03-09 15:41:13 -05001802#else
1803
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001804#define usb_bus_pm_ops (*(struct dev_pm_ops *) NULL)
Alan Stern9ac39f22008-11-12 16:19:49 -05001805
Alan Stern645daaa2006-08-30 15:47:02 -04001806#endif /* CONFIG_USB_SUSPEND */
1807
Alan Stern36e56a32006-07-01 22:08:06 -04001808struct bus_type usb_bus_type = {
1809 .name = "usb",
1810 .match = usb_device_match,
1811 .uevent = usb_uevent,
Alan Stern9bbdf1e2010-01-08 12:57:28 -05001812 .pm = &usb_bus_pm_ops,
Alan Stern36e56a32006-07-01 22:08:06 -04001813};