Commit | Line | Data |
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aa1f3bb5 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ddae41be GKH |
2 | /* |
3 | * drivers/usb/driver.c - most of the driver model stuff for usb | |
4 | * | |
5 | * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de> | |
6 | * | |
7 | * based on drivers/usb/usb.c which had the following copyrights: | |
8 | * (C) Copyright Linus Torvalds 1999 | |
9 | * (C) Copyright Johannes Erdfelt 1999-2001 | |
10 | * (C) Copyright Andreas Gal 1999 | |
11 | * (C) Copyright Gregory P. Smith 1999 | |
12 | * (C) Copyright Deti Fliegl 1999 (new USB architecture) | |
13 | * (C) Copyright Randy Dunlap 2000 | |
14 | * (C) Copyright David Brownell 2000-2004 | |
15 | * (C) Copyright Yggdrasil Computing, Inc. 2000 | |
16 | * (usb_device_id matching changes by Adam J. Richter) | |
17 | * (C) Copyright Greg Kroah-Hartman 2002-2003 | |
18 | * | |
b65fba3d | 19 | * Released under the GPLv2 only. |
b65fba3d | 20 | * |
ddae41be GKH |
21 | * NOTE! This is not actually a driver at all, rather this is |
22 | * just a collection of helper routines that implement the | |
36e56a34 AS |
23 | * matching, probing, releasing, suspending and resuming for |
24 | * real drivers. | |
ddae41be GKH |
25 | * |
26 | */ | |
27 | ||
ddae41be | 28 | #include <linux/device.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
f940fcd8 | 30 | #include <linux/export.h> |
ddae41be | 31 | #include <linux/usb.h> |
6bc6cff5 | 32 | #include <linux/usb/quirks.h> |
27729aad | 33 | #include <linux/usb/hcd.h> |
27729aad | 34 | |
ddae41be GKH |
35 | #include "usb.h" |
36 | ||
20dfdad7 | 37 | |
733260ff GKH |
38 | /* |
39 | * Adds a new dynamic USBdevice ID to this driver, | |
40 | * and cause the driver to probe for all devices again. | |
41 | */ | |
93bacefc | 42 | ssize_t usb_store_new_id(struct usb_dynids *dynids, |
2fc82c2d | 43 | const struct usb_device_id *id_table, |
93bacefc GKH |
44 | struct device_driver *driver, |
45 | const char *buf, size_t count) | |
733260ff | 46 | { |
733260ff GKH |
47 | struct usb_dynid *dynid; |
48 | u32 idVendor = 0; | |
49 | u32 idProduct = 0; | |
ff231db8 | 50 | unsigned int bInterfaceClass = 0; |
2fc82c2d | 51 | u32 refVendor, refProduct; |
733260ff | 52 | int fields = 0; |
1b21d5e1 | 53 | int retval = 0; |
733260ff | 54 | |
2fc82c2d WS |
55 | fields = sscanf(buf, "%x %x %x %x %x", &idVendor, &idProduct, |
56 | &bInterfaceClass, &refVendor, &refProduct); | |
733260ff GKH |
57 | if (fields < 2) |
58 | return -EINVAL; | |
59 | ||
60 | dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); | |
61 | if (!dynid) | |
62 | return -ENOMEM; | |
63 | ||
64 | INIT_LIST_HEAD(&dynid->node); | |
65 | dynid->id.idVendor = idVendor; | |
66 | dynid->id.idProduct = idProduct; | |
67 | dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; | |
c63fe8f6 | 68 | if (fields > 2 && bInterfaceClass) { |
7f196caf CE |
69 | if (bInterfaceClass > 255) { |
70 | retval = -EINVAL; | |
71 | goto fail; | |
72 | } | |
c63fe8f6 | 73 | |
ff231db8 JD |
74 | dynid->id.bInterfaceClass = (u8)bInterfaceClass; |
75 | dynid->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS; | |
76 | } | |
733260ff | 77 | |
2fc82c2d WS |
78 | if (fields > 4) { |
79 | const struct usb_device_id *id = id_table; | |
80 | ||
7f196caf CE |
81 | if (!id) { |
82 | retval = -ENODEV; | |
83 | goto fail; | |
84 | } | |
1b9fb31f | 85 | |
2fc82c2d | 86 | for (; id->match_flags; id++) |
52a6966c | 87 | if (id->idVendor == refVendor && id->idProduct == refProduct) |
2fc82c2d | 88 | break; |
52a6966c | 89 | |
7f196caf | 90 | if (id->match_flags) { |
52a6966c | 91 | dynid->id.driver_info = id->driver_info; |
7f196caf CE |
92 | } else { |
93 | retval = -ENODEV; | |
94 | goto fail; | |
95 | } | |
2fc82c2d WS |
96 | } |
97 | ||
93bacefc | 98 | spin_lock(&dynids->lock); |
e5dd0115 | 99 | list_add_tail(&dynid->node, &dynids->list); |
93bacefc | 100 | spin_unlock(&dynids->lock); |
733260ff | 101 | |
cef9bc56 | 102 | retval = driver_attach(driver); |
733260ff | 103 | |
1b21d5e1 GKH |
104 | if (retval) |
105 | return retval; | |
733260ff | 106 | return count; |
7f196caf CE |
107 | |
108 | fail: | |
109 | kfree(dynid); | |
110 | return retval; | |
733260ff | 111 | } |
93bacefc GKH |
112 | EXPORT_SYMBOL_GPL(usb_store_new_id); |
113 | ||
ef206f3f | 114 | ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf) |
e6bbcef0 BM |
115 | { |
116 | struct usb_dynid *dynid; | |
e6bbcef0 BM |
117 | size_t count = 0; |
118 | ||
ef206f3f | 119 | list_for_each_entry(dynid, &dynids->list, node) |
e6bbcef0 BM |
120 | if (dynid->id.bInterfaceClass != 0) |
121 | count += scnprintf(&buf[count], PAGE_SIZE - count, "%04x %04x %02x\n", | |
122 | dynid->id.idVendor, dynid->id.idProduct, | |
123 | dynid->id.bInterfaceClass); | |
124 | else | |
125 | count += scnprintf(&buf[count], PAGE_SIZE - count, "%04x %04x\n", | |
126 | dynid->id.idVendor, dynid->id.idProduct); | |
127 | return count; | |
128 | } | |
ef206f3f BM |
129 | EXPORT_SYMBOL_GPL(usb_show_dynids); |
130 | ||
598d0361 | 131 | static ssize_t new_id_show(struct device_driver *driver, char *buf) |
ef206f3f BM |
132 | { |
133 | struct usb_driver *usb_drv = to_usb_driver(driver); | |
134 | ||
135 | return usb_show_dynids(&usb_drv->dynids, buf); | |
136 | } | |
e6bbcef0 | 137 | |
598d0361 | 138 | static ssize_t new_id_store(struct device_driver *driver, |
93bacefc GKH |
139 | const char *buf, size_t count) |
140 | { | |
141 | struct usb_driver *usb_drv = to_usb_driver(driver); | |
142 | ||
2fc82c2d | 143 | return usb_store_new_id(&usb_drv->dynids, usb_drv->id_table, driver, buf, count); |
93bacefc | 144 | } |
598d0361 | 145 | static DRIVER_ATTR_RW(new_id); |
733260ff | 146 | |
598d0361 GKH |
147 | /* |
148 | * Remove a USB device ID from this driver | |
0c7a2b72 | 149 | */ |
598d0361 GKH |
150 | static ssize_t remove_id_store(struct device_driver *driver, const char *buf, |
151 | size_t count) | |
0c7a2b72 CR |
152 | { |
153 | struct usb_dynid *dynid, *n; | |
154 | struct usb_driver *usb_driver = to_usb_driver(driver); | |
ac08de32 AC |
155 | u32 idVendor; |
156 | u32 idProduct; | |
157 | int fields; | |
0c7a2b72 CR |
158 | |
159 | fields = sscanf(buf, "%x %x", &idVendor, &idProduct); | |
160 | if (fields < 2) | |
161 | return -EINVAL; | |
162 | ||
163 | spin_lock(&usb_driver->dynids.lock); | |
164 | list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) { | |
165 | struct usb_device_id *id = &dynid->id; | |
79a02744 | 166 | |
0c7a2b72 CR |
167 | if ((id->idVendor == idVendor) && |
168 | (id->idProduct == idProduct)) { | |
169 | list_del(&dynid->node); | |
170 | kfree(dynid); | |
0c7a2b72 CR |
171 | break; |
172 | } | |
173 | } | |
174 | spin_unlock(&usb_driver->dynids.lock); | |
0c7a2b72 CR |
175 | return count; |
176 | } | |
598d0361 GKH |
177 | |
178 | static ssize_t remove_id_show(struct device_driver *driver, char *buf) | |
179 | { | |
180 | return new_id_show(driver, buf); | |
181 | } | |
182 | static DRIVER_ATTR_RW(remove_id); | |
0c7a2b72 | 183 | |
ed283e9f | 184 | static int usb_create_newid_files(struct usb_driver *usb_drv) |
733260ff GKH |
185 | { |
186 | int error = 0; | |
187 | ||
ba9dc657 GKH |
188 | if (usb_drv->no_dynamic_id) |
189 | goto exit; | |
190 | ||
ed283e9f | 191 | if (usb_drv->probe != NULL) { |
15147ffd GKH |
192 | error = driver_create_file(&usb_drv->drvwrap.driver, |
193 | &driver_attr_new_id); | |
ed283e9f AS |
194 | if (error == 0) { |
195 | error = driver_create_file(&usb_drv->drvwrap.driver, | |
196 | &driver_attr_remove_id); | |
197 | if (error) | |
198 | driver_remove_file(&usb_drv->drvwrap.driver, | |
199 | &driver_attr_new_id); | |
200 | } | |
201 | } | |
ba9dc657 | 202 | exit: |
733260ff GKH |
203 | return error; |
204 | } | |
205 | ||
ed283e9f | 206 | static void usb_remove_newid_files(struct usb_driver *usb_drv) |
ba9dc657 GKH |
207 | { |
208 | if (usb_drv->no_dynamic_id) | |
209 | return; | |
210 | ||
ed283e9f | 211 | if (usb_drv->probe != NULL) { |
15147ffd | 212 | driver_remove_file(&usb_drv->drvwrap.driver, |
0c7a2b72 | 213 | &driver_attr_remove_id); |
ed283e9f AS |
214 | driver_remove_file(&usb_drv->drvwrap.driver, |
215 | &driver_attr_new_id); | |
216 | } | |
0c7a2b72 CR |
217 | } |
218 | ||
733260ff GKH |
219 | static void usb_free_dynids(struct usb_driver *usb_drv) |
220 | { | |
221 | struct usb_dynid *dynid, *n; | |
222 | ||
223 | spin_lock(&usb_drv->dynids.lock); | |
224 | list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { | |
225 | list_del(&dynid->node); | |
226 | kfree(dynid); | |
227 | } | |
228 | spin_unlock(&usb_drv->dynids.lock); | |
229 | } | |
733260ff GKH |
230 | |
231 | static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, | |
232 | struct usb_driver *drv) | |
233 | { | |
234 | struct usb_dynid *dynid; | |
235 | ||
236 | spin_lock(&drv->dynids.lock); | |
237 | list_for_each_entry(dynid, &drv->dynids.list, node) { | |
238 | if (usb_match_one_id(intf, &dynid->id)) { | |
239 | spin_unlock(&drv->dynids.lock); | |
240 | return &dynid->id; | |
241 | } | |
242 | } | |
243 | spin_unlock(&drv->dynids.lock); | |
244 | return NULL; | |
245 | } | |
246 | ||
247 | ||
8bb54ab5 AS |
248 | /* called from driver core with dev locked */ |
249 | static int usb_probe_device(struct device *dev) | |
250 | { | |
251 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); | |
55129666 | 252 | struct usb_device *udev = to_usb_device(dev); |
9bbdf1e0 | 253 | int error = 0; |
8bb54ab5 | 254 | |
441b62c1 | 255 | dev_dbg(dev, "%s\n", __func__); |
8bb54ab5 | 256 | |
8bb54ab5 AS |
257 | /* TODO: Add real matching code */ |
258 | ||
645daaab | 259 | /* The device should always appear to be in use |
02582e9b | 260 | * unless the driver supports autosuspend. |
645daaab | 261 | */ |
9bbdf1e0 AS |
262 | if (!udriver->supports_autosuspend) |
263 | error = usb_autoresume_device(udev); | |
c9d50337 BN |
264 | if (error) |
265 | return error; | |
645daaab | 266 | |
c9d50337 BN |
267 | if (udriver->generic_subclass) |
268 | error = usb_generic_driver_probe(udev); | |
269 | if (error) | |
270 | return error; | |
271 | ||
272 | error = udriver->probe(udev); | |
77419aa4 BN |
273 | if (error == -ENODEV && udriver != &usb_generic_driver) { |
274 | udev->use_generic_driver = 1; | |
275 | return -EPROBE_DEFER; | |
276 | } | |
8bb54ab5 AS |
277 | return error; |
278 | } | |
279 | ||
280 | /* called from driver core with dev locked */ | |
281 | static int usb_unbind_device(struct device *dev) | |
282 | { | |
9bbdf1e0 | 283 | struct usb_device *udev = to_usb_device(dev); |
8bb54ab5 AS |
284 | struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
285 | ||
c9d50337 BN |
286 | if (udriver->disconnect) |
287 | udriver->disconnect(udev); | |
288 | if (udriver->generic_subclass) | |
289 | usb_generic_driver_disconnect(udev); | |
9bbdf1e0 AS |
290 | if (!udriver->supports_autosuspend) |
291 | usb_autosuspend_device(udev); | |
8bb54ab5 AS |
292 | return 0; |
293 | } | |
294 | ||
8bb54ab5 | 295 | /* called from driver core with dev locked */ |
ddae41be GKH |
296 | static int usb_probe_interface(struct device *dev) |
297 | { | |
8bb54ab5 | 298 | struct usb_driver *driver = to_usb_driver(dev->driver); |
55129666 KS |
299 | struct usb_interface *intf = to_usb_interface(dev); |
300 | struct usb_device *udev = interface_to_usbdev(intf); | |
ddae41be GKH |
301 | const struct usb_device_id *id; |
302 | int error = -ENODEV; | |
6fb650d4 | 303 | int lpm_disable_error = -ENODEV; |
ddae41be | 304 | |
441b62c1 | 305 | dev_dbg(dev, "%s\n", __func__); |
ddae41be | 306 | |
78d9a487 | 307 | intf->needs_binding = 0; |
ddae41be | 308 | |
7cbe5dca | 309 | if (usb_device_is_owned(udev)) |
0f3dda9f | 310 | return error; |
7cbe5dca | 311 | |
2c044a48 GKH |
312 | if (udev->authorized == 0) { |
313 | dev_err(&intf->dev, "Device is not authorized for usage\n"); | |
0f3dda9f | 314 | return error; |
8d1f8573 SK |
315 | } else if (intf->authorized == 0) { |
316 | dev_err(&intf->dev, "Interface %d is not authorized for usage\n", | |
317 | intf->altsetting->desc.bInterfaceNumber); | |
318 | return error; | |
2c044a48 | 319 | } |
72230abb | 320 | |
31c6bf70 | 321 | id = usb_match_dynamic_id(intf, driver); |
733260ff | 322 | if (!id) |
31c6bf70 | 323 | id = usb_match_id(intf, driver->id_table); |
0f3dda9f AS |
324 | if (!id) |
325 | return error; | |
55151d7d | 326 | |
0f3dda9f AS |
327 | dev_dbg(dev, "%s - got id\n", __func__); |
328 | ||
329 | error = usb_autoresume_device(udev); | |
330 | if (error) | |
331 | return error; | |
332 | ||
0f3dda9f | 333 | intf->condition = USB_INTERFACE_BINDING; |
645daaab | 334 | |
571dc79d | 335 | /* Probed interfaces are initially active. They are |
9bbdf1e0 AS |
336 | * runtime-PM-enabled only if the driver has autosuspend support. |
337 | * They are sensitive to their children's power states. | |
0f3dda9f | 338 | */ |
9bbdf1e0 AS |
339 | pm_runtime_set_active(dev); |
340 | pm_suspend_ignore_children(dev, false); | |
341 | if (driver->supports_autosuspend) | |
342 | pm_runtime_enable(dev); | |
0f3dda9f | 343 | |
8306095f SS |
344 | /* If the new driver doesn't allow hub-initiated LPM, and we can't |
345 | * disable hub-initiated LPM, then fail the probe. | |
346 | * | |
347 | * Otherwise, leaving LPM enabled should be harmless, because the | |
348 | * endpoint intervals should remain the same, and the U1/U2 timeouts | |
349 | * should remain the same. | |
350 | * | |
351 | * If we need to install alt setting 0 before probe, or another alt | |
352 | * setting during probe, that should also be fine. usb_set_interface() | |
353 | * will attempt to disable LPM, and fail if it can't disable it. | |
354 | */ | |
6fb650d4 AS |
355 | if (driver->disable_hub_initiated_lpm) { |
356 | lpm_disable_error = usb_unlocked_disable_lpm(udev); | |
357 | if (lpm_disable_error) { | |
1ccc417e JP |
358 | dev_err(&intf->dev, "%s Failed to disable LPM for driver %s\n", |
359 | __func__, driver->name); | |
6fb650d4 AS |
360 | error = lpm_disable_error; |
361 | goto err; | |
362 | } | |
8306095f SS |
363 | } |
364 | ||
0f3dda9f AS |
365 | /* Carry out a deferred switch to altsetting 0 */ |
366 | if (intf->needs_altsetting0) { | |
367 | error = usb_set_interface(udev, intf->altsetting[0]. | |
368 | desc.bInterfaceNumber, 0); | |
369 | if (error < 0) | |
370 | goto err; | |
371 | intf->needs_altsetting0 = 0; | |
ddae41be GKH |
372 | } |
373 | ||
0f3dda9f AS |
374 | error = driver->probe(intf, id); |
375 | if (error) | |
376 | goto err; | |
377 | ||
378 | intf->condition = USB_INTERFACE_BOUND; | |
8306095f SS |
379 | |
380 | /* If the LPM disable succeeded, balance the ref counts. */ | |
381 | if (!lpm_disable_error) | |
382 | usb_unlocked_enable_lpm(udev); | |
383 | ||
0f3dda9f | 384 | usb_autosuspend_device(udev); |
ddae41be | 385 | return error; |
1e5ea5e3 | 386 | |
0f3dda9f | 387 | err: |
e714fad0 | 388 | usb_set_intfdata(intf, NULL); |
1e5ea5e3 ON |
389 | intf->needs_remote_wakeup = 0; |
390 | intf->condition = USB_INTERFACE_UNBOUND; | |
9bbdf1e0 | 391 | |
d01f87c0 SS |
392 | /* If the LPM disable succeeded, balance the ref counts. */ |
393 | if (!lpm_disable_error) | |
394 | usb_unlocked_enable_lpm(udev); | |
395 | ||
9bbdf1e0 | 396 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
89842ae6 AS |
397 | if (driver->supports_autosuspend) |
398 | pm_runtime_disable(dev); | |
9bbdf1e0 AS |
399 | pm_runtime_set_suspended(dev); |
400 | ||
1e5ea5e3 ON |
401 | usb_autosuspend_device(udev); |
402 | return error; | |
ddae41be GKH |
403 | } |
404 | ||
8bb54ab5 | 405 | /* called from driver core with dev locked */ |
ddae41be GKH |
406 | static int usb_unbind_interface(struct device *dev) |
407 | { | |
8bb54ab5 | 408 | struct usb_driver *driver = to_usb_driver(dev->driver); |
ddae41be | 409 | struct usb_interface *intf = to_usb_interface(dev); |
6343e8bf | 410 | struct usb_host_endpoint *ep, **eps = NULL; |
645daaab | 411 | struct usb_device *udev; |
6fb650d4 AS |
412 | int i, j, error, r; |
413 | int lpm_disable_error = -ENODEV; | |
ddae41be GKH |
414 | |
415 | intf->condition = USB_INTERFACE_UNBINDING; | |
416 | ||
645daaab AS |
417 | /* Autoresume for set_interface call below */ |
418 | udev = interface_to_usbdev(intf); | |
94fcda1f | 419 | error = usb_autoresume_device(udev); |
645daaab | 420 | |
6fb650d4 | 421 | /* If hub-initiated LPM policy may change, attempt to disable LPM until |
8306095f SS |
422 | * the driver is unbound. If LPM isn't disabled, that's fine because it |
423 | * wouldn't be enabled unless all the bound interfaces supported | |
424 | * hub-initiated LPM. | |
425 | */ | |
6fb650d4 AS |
426 | if (driver->disable_hub_initiated_lpm) |
427 | lpm_disable_error = usb_unlocked_disable_lpm(udev); | |
8306095f | 428 | |
1299cff9 AS |
429 | /* |
430 | * Terminate all URBs for this interface unless the driver | |
431 | * supports "soft" unbinding and the device is still present. | |
9da82bd4 | 432 | */ |
1299cff9 | 433 | if (!driver->soft_unbind || udev->state == USB_STATE_NOTATTACHED) |
ddeac4e7 | 434 | usb_disable_interface(udev, intf, false); |
ddae41be | 435 | |
8bb54ab5 | 436 | driver->disconnect(intf); |
ddae41be | 437 | |
6343e8bf HG |
438 | /* Free streams */ |
439 | for (i = 0, j = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) { | |
440 | ep = &intf->cur_altsetting->endpoint[i]; | |
441 | if (ep->streams == 0) | |
442 | continue; | |
443 | if (j == 0) { | |
9766f251 | 444 | eps = kmalloc_array(USB_MAXENDPOINTS, sizeof(void *), |
6343e8bf | 445 | GFP_KERNEL); |
9766f251 | 446 | if (!eps) |
6343e8bf | 447 | break; |
6343e8bf HG |
448 | } |
449 | eps[j++] = ep; | |
450 | } | |
451 | if (j) { | |
452 | usb_free_streams(intf, eps, j, GFP_KERNEL); | |
453 | kfree(eps); | |
454 | } | |
455 | ||
55151d7d AS |
456 | /* Reset other interface state. |
457 | * We cannot do a Set-Interface if the device is suspended or | |
458 | * if it is prepared for a system sleep (since installing a new | |
459 | * altsetting means creating new endpoint device entries). | |
460 | * When either of these happens, defer the Set-Interface. | |
461 | */ | |
2caf7fcd AS |
462 | if (intf->cur_altsetting->desc.bAlternateSetting == 0) { |
463 | /* Already in altsetting 0 so skip Set-Interface. | |
464 | * Just re-enable it without affecting the endpoint toggles. | |
465 | */ | |
466 | usb_enable_interface(udev, intf, false); | |
f76b168b | 467 | } else if (!error && !intf->dev.power.is_prepared) { |
1e5ea5e3 | 468 | r = usb_set_interface(udev, intf->altsetting[0]. |
55151d7d | 469 | desc.bInterfaceNumber, 0); |
1e5ea5e3 ON |
470 | if (r < 0) |
471 | intf->needs_altsetting0 = 1; | |
472 | } else { | |
55151d7d | 473 | intf->needs_altsetting0 = 1; |
1e5ea5e3 | 474 | } |
ddae41be | 475 | usb_set_intfdata(intf, NULL); |
645daaab | 476 | |
ddae41be | 477 | intf->condition = USB_INTERFACE_UNBOUND; |
645daaab AS |
478 | intf->needs_remote_wakeup = 0; |
479 | ||
8306095f SS |
480 | /* Attempt to re-enable USB3 LPM, if the disable succeeded. */ |
481 | if (!lpm_disable_error) | |
482 | usb_unlocked_enable_lpm(udev); | |
483 | ||
9bbdf1e0 | 484 | /* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
89842ae6 AS |
485 | if (driver->supports_autosuspend) |
486 | pm_runtime_disable(dev); | |
9bbdf1e0 AS |
487 | pm_runtime_set_suspended(dev); |
488 | ||
645daaab | 489 | if (!error) |
94fcda1f | 490 | usb_autosuspend_device(udev); |
ddae41be GKH |
491 | |
492 | return 0; | |
493 | } | |
494 | ||
36e56a34 AS |
495 | /** |
496 | * usb_driver_claim_interface - bind a driver to an interface | |
497 | * @driver: the driver to be bound | |
498 | * @iface: the interface to which it will be bound; must be in the | |
499 | * usb device's active configuration | |
500 | * @priv: driver data associated with that interface | |
501 | * | |
502 | * This is used by usb device drivers that need to claim more than one | |
503 | * interface on a device when probing (audio and acm are current examples). | |
504 | * No device driver should directly modify internal usb_interface or | |
505 | * usb_device structure members. | |
506 | * | |
507 | * Few drivers should need to use this routine, since the most natural | |
508 | * way to bind to an interface is to return the private data from | |
509 | * the driver's probe() method. | |
510 | * | |
341487a8 GKH |
511 | * Callers must own the device lock, so driver probe() entries don't need |
512 | * extra locking, but other call contexts may need to explicitly claim that | |
513 | * lock. | |
626f090c YB |
514 | * |
515 | * Return: 0 on success. | |
36e56a34 AS |
516 | */ |
517 | int usb_driver_claim_interface(struct usb_driver *driver, | |
2c044a48 | 518 | struct usb_interface *iface, void *priv) |
36e56a34 | 519 | { |
0b818e39 | 520 | struct device *dev; |
1b21d5e1 | 521 | int retval = 0; |
36e56a34 | 522 | |
0b818e39 ON |
523 | if (!iface) |
524 | return -ENODEV; | |
525 | ||
526 | dev = &iface->dev; | |
36e56a34 AS |
527 | if (dev->driver) |
528 | return -EBUSY; | |
529 | ||
8d1f8573 SK |
530 | /* reject claim if interface is not authorized */ |
531 | if (!iface->authorized) | |
532 | return -ENODEV; | |
533 | ||
8bb54ab5 | 534 | dev->driver = &driver->drvwrap.driver; |
36e56a34 | 535 | usb_set_intfdata(iface, priv); |
78d9a487 | 536 | iface->needs_binding = 0; |
645daaab | 537 | |
36e56a34 | 538 | iface->condition = USB_INTERFACE_BOUND; |
9bbdf1e0 | 539 | |
89842ae6 AS |
540 | /* Claimed interfaces are initially inactive (suspended) and |
541 | * runtime-PM-enabled, but only if the driver has autosuspend | |
542 | * support. Otherwise they are marked active, to prevent the | |
543 | * device from being autosuspended, but left disabled. In either | |
544 | * case they are sensitive to their children's power states. | |
9bbdf1e0 | 545 | */ |
9bbdf1e0 AS |
546 | pm_suspend_ignore_children(dev, false); |
547 | if (driver->supports_autosuspend) | |
548 | pm_runtime_enable(dev); | |
89842ae6 AS |
549 | else |
550 | pm_runtime_set_active(dev); | |
36e56a34 AS |
551 | |
552 | /* if interface was already added, bind now; else let | |
553 | * the future device_add() bind it, bypassing probe() | |
554 | */ | |
555 | if (device_is_registered(dev)) | |
1b21d5e1 | 556 | retval = device_bind_driver(dev); |
36e56a34 | 557 | |
bd729f9d AS |
558 | if (retval) { |
559 | dev->driver = NULL; | |
560 | usb_set_intfdata(iface, NULL); | |
561 | iface->needs_remote_wakeup = 0; | |
562 | iface->condition = USB_INTERFACE_UNBOUND; | |
563 | ||
564 | /* | |
565 | * Unbound interfaces are always runtime-PM-disabled | |
566 | * and runtime-PM-suspended | |
567 | */ | |
568 | if (driver->supports_autosuspend) | |
569 | pm_runtime_disable(dev); | |
570 | pm_runtime_set_suspended(dev); | |
571 | } | |
572 | ||
1b21d5e1 | 573 | return retval; |
36e56a34 | 574 | } |
782e70c6 | 575 | EXPORT_SYMBOL_GPL(usb_driver_claim_interface); |
36e56a34 AS |
576 | |
577 | /** | |
578 | * usb_driver_release_interface - unbind a driver from an interface | |
579 | * @driver: the driver to be unbound | |
580 | * @iface: the interface from which it will be unbound | |
581 | * | |
582 | * This can be used by drivers to release an interface without waiting | |
583 | * for their disconnect() methods to be called. In typical cases this | |
584 | * also causes the driver disconnect() method to be called. | |
585 | * | |
586 | * This call is synchronous, and may not be used in an interrupt context. | |
341487a8 GKH |
587 | * Callers must own the device lock, so driver disconnect() entries don't |
588 | * need extra locking, but other call contexts may need to explicitly claim | |
589 | * that lock. | |
36e56a34 AS |
590 | */ |
591 | void usb_driver_release_interface(struct usb_driver *driver, | |
592 | struct usb_interface *iface) | |
593 | { | |
594 | struct device *dev = &iface->dev; | |
595 | ||
596 | /* this should never happen, don't release something that's not ours */ | |
8bb54ab5 | 597 | if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
36e56a34 AS |
598 | return; |
599 | ||
600 | /* don't release from within disconnect() */ | |
601 | if (iface->condition != USB_INTERFACE_BOUND) | |
602 | return; | |
91f8d063 | 603 | iface->condition = USB_INTERFACE_UNBINDING; |
36e56a34 | 604 | |
91f8d063 AS |
605 | /* Release via the driver core only if the interface |
606 | * has already been registered | |
607 | */ | |
36e56a34 | 608 | if (device_is_registered(dev)) { |
36e56a34 | 609 | device_release_driver(dev); |
dc023dce | 610 | } else { |
8e9394ce | 611 | device_lock(dev); |
91f8d063 AS |
612 | usb_unbind_interface(dev); |
613 | dev->driver = NULL; | |
8e9394ce | 614 | device_unlock(dev); |
36e56a34 | 615 | } |
36e56a34 | 616 | } |
782e70c6 | 617 | EXPORT_SYMBOL_GPL(usb_driver_release_interface); |
36e56a34 | 618 | |
733260ff | 619 | /* returns 0 if no match, 1 if match */ |
bb417020 | 620 | int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
733260ff | 621 | { |
733260ff GKH |
622 | if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
623 | id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) | |
624 | return 0; | |
625 | ||
626 | if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && | |
627 | id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) | |
628 | return 0; | |
629 | ||
630 | /* No need to test id->bcdDevice_lo != 0, since 0 is never | |
631 | greater than any unsigned number. */ | |
632 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && | |
633 | (id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) | |
634 | return 0; | |
635 | ||
636 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && | |
637 | (id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) | |
638 | return 0; | |
639 | ||
640 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && | |
641 | (id->bDeviceClass != dev->descriptor.bDeviceClass)) | |
642 | return 0; | |
643 | ||
644 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && | |
2c044a48 | 645 | (id->bDeviceSubClass != dev->descriptor.bDeviceSubClass)) |
733260ff GKH |
646 | return 0; |
647 | ||
648 | if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && | |
649 | (id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) | |
650 | return 0; | |
651 | ||
bb417020 GKH |
652 | return 1; |
653 | } | |
654 | ||
655 | /* returns 0 if no match, 1 if match */ | |
80da2e0d LP |
656 | int usb_match_one_id_intf(struct usb_device *dev, |
657 | struct usb_host_interface *intf, | |
658 | const struct usb_device_id *id) | |
bb417020 | 659 | { |
81df2d59 | 660 | /* The interface class, subclass, protocol and number should never be |
93c8bf45 AS |
661 | * checked for a match if the device class is Vendor Specific, |
662 | * unless the match record specifies the Vendor ID. */ | |
663 | if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC && | |
664 | !(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && | |
665 | (id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS | | |
666 | USB_DEVICE_ID_MATCH_INT_SUBCLASS | | |
81df2d59 BM |
667 | USB_DEVICE_ID_MATCH_INT_PROTOCOL | |
668 | USB_DEVICE_ID_MATCH_INT_NUMBER))) | |
93c8bf45 AS |
669 | return 0; |
670 | ||
733260ff GKH |
671 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
672 | (id->bInterfaceClass != intf->desc.bInterfaceClass)) | |
673 | return 0; | |
674 | ||
675 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && | |
676 | (id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) | |
677 | return 0; | |
678 | ||
679 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && | |
680 | (id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) | |
681 | return 0; | |
682 | ||
81df2d59 BM |
683 | if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) && |
684 | (id->bInterfaceNumber != intf->desc.bInterfaceNumber)) | |
685 | return 0; | |
686 | ||
733260ff GKH |
687 | return 1; |
688 | } | |
80da2e0d LP |
689 | |
690 | /* returns 0 if no match, 1 if match */ | |
691 | int usb_match_one_id(struct usb_interface *interface, | |
692 | const struct usb_device_id *id) | |
693 | { | |
694 | struct usb_host_interface *intf; | |
695 | struct usb_device *dev; | |
696 | ||
697 | /* proc_connectinfo in devio.c may call us with id == NULL. */ | |
698 | if (id == NULL) | |
699 | return 0; | |
700 | ||
701 | intf = interface->cur_altsetting; | |
702 | dev = interface_to_usbdev(interface); | |
703 | ||
704 | if (!usb_match_device(dev, id)) | |
705 | return 0; | |
706 | ||
707 | return usb_match_one_id_intf(dev, intf, id); | |
708 | } | |
93bacefc GKH |
709 | EXPORT_SYMBOL_GPL(usb_match_one_id); |
710 | ||
ddae41be GKH |
711 | /** |
712 | * usb_match_id - find first usb_device_id matching device or interface | |
713 | * @interface: the interface of interest | |
714 | * @id: array of usb_device_id structures, terminated by zero entry | |
715 | * | |
716 | * usb_match_id searches an array of usb_device_id's and returns | |
717 | * the first one matching the device or interface, or null. | |
718 | * This is used when binding (or rebinding) a driver to an interface. | |
719 | * Most USB device drivers will use this indirectly, through the usb core, | |
720 | * but some layered driver frameworks use it directly. | |
721 | * These device tables are exported with MODULE_DEVICE_TABLE, through | |
722 | * modutils, to support the driver loading functionality of USB hotplugging. | |
723 | * | |
626f090c YB |
724 | * Return: The first matching usb_device_id, or %NULL. |
725 | * | |
ddae41be GKH |
726 | * What Matches: |
727 | * | |
728 | * The "match_flags" element in a usb_device_id controls which | |
729 | * members are used. If the corresponding bit is set, the | |
730 | * value in the device_id must match its corresponding member | |
731 | * in the device or interface descriptor, or else the device_id | |
732 | * does not match. | |
733 | * | |
734 | * "driver_info" is normally used only by device drivers, | |
735 | * but you can create a wildcard "matches anything" usb_device_id | |
736 | * as a driver's "modules.usbmap" entry if you provide an id with | |
737 | * only a nonzero "driver_info" field. If you do this, the USB device | |
738 | * driver's probe() routine should use additional intelligence to | |
739 | * decide whether to bind to the specified interface. | |
740 | * | |
741 | * What Makes Good usb_device_id Tables: | |
742 | * | |
743 | * The match algorithm is very simple, so that intelligence in | |
744 | * driver selection must come from smart driver id records. | |
745 | * Unless you have good reasons to use another selection policy, | |
746 | * provide match elements only in related groups, and order match | |
747 | * specifiers from specific to general. Use the macros provided | |
748 | * for that purpose if you can. | |
749 | * | |
750 | * The most specific match specifiers use device descriptor | |
751 | * data. These are commonly used with product-specific matches; | |
752 | * the USB_DEVICE macro lets you provide vendor and product IDs, | |
753 | * and you can also match against ranges of product revisions. | |
754 | * These are widely used for devices with application or vendor | |
755 | * specific bDeviceClass values. | |
756 | * | |
757 | * Matches based on device class/subclass/protocol specifications | |
758 | * are slightly more general; use the USB_DEVICE_INFO macro, or | |
759 | * its siblings. These are used with single-function devices | |
760 | * where bDeviceClass doesn't specify that each interface has | |
761 | * its own class. | |
762 | * | |
763 | * Matches based on interface class/subclass/protocol are the | |
764 | * most general; they let drivers bind to any interface on a | |
765 | * multiple-function device. Use the USB_INTERFACE_INFO | |
766 | * macro, or its siblings, to match class-per-interface style | |
93c8bf45 AS |
767 | * devices (as recorded in bInterfaceClass). |
768 | * | |
769 | * Note that an entry created by USB_INTERFACE_INFO won't match | |
770 | * any interface if the device class is set to Vendor-Specific. | |
771 | * This is deliberate; according to the USB spec the meanings of | |
772 | * the interface class/subclass/protocol for these devices are also | |
773 | * vendor-specific, and hence matching against a standard product | |
774 | * class wouldn't work anyway. If you really want to use an | |
775 | * interface-based match for such a device, create a match record | |
776 | * that also specifies the vendor ID. (Unforunately there isn't a | |
777 | * standard macro for creating records like this.) | |
ddae41be GKH |
778 | * |
779 | * Within those groups, remember that not all combinations are | |
780 | * meaningful. For example, don't give a product version range | |
781 | * without vendor and product IDs; or specify a protocol without | |
782 | * its associated class and subclass. | |
783 | */ | |
784 | const struct usb_device_id *usb_match_id(struct usb_interface *interface, | |
785 | const struct usb_device_id *id) | |
786 | { | |
ddae41be GKH |
787 | /* proc_connectinfo in devio.c may call us with id == NULL. */ |
788 | if (id == NULL) | |
789 | return NULL; | |
790 | ||
ddae41be GKH |
791 | /* It is important to check that id->driver_info is nonzero, |
792 | since an entry that is all zeroes except for a nonzero | |
793 | id->driver_info is the way to create an entry that | |
794 | indicates that the driver want to examine every | |
795 | device and interface. */ | |
de6f92b9 GKH |
796 | for (; id->idVendor || id->idProduct || id->bDeviceClass || |
797 | id->bInterfaceClass || id->driver_info; id++) { | |
733260ff GKH |
798 | if (usb_match_one_id(interface, id)) |
799 | return id; | |
ddae41be GKH |
800 | } |
801 | ||
802 | return NULL; | |
803 | } | |
782e70c6 | 804 | EXPORT_SYMBOL_GPL(usb_match_id); |
ddae41be | 805 | |
aeebf2b5 BN |
806 | const struct usb_device_id *usb_device_match_id(struct usb_device *udev, |
807 | const struct usb_device_id *id) | |
808 | { | |
809 | if (!id) | |
810 | return NULL; | |
811 | ||
812 | for (; id->idVendor || id->idProduct ; id++) { | |
813 | if (usb_match_device(udev, id)) | |
814 | return id; | |
815 | } | |
816 | ||
817 | return NULL; | |
818 | } | |
819 | ||
8bb22d2b | 820 | static int usb_device_match(struct device *dev, struct device_driver *drv) |
ddae41be | 821 | { |
8bb54ab5 AS |
822 | /* devices and interfaces are handled separately */ |
823 | if (is_usb_device(dev)) { | |
88b7381a BN |
824 | struct usb_device *udev; |
825 | struct usb_device_driver *udrv; | |
ddae41be | 826 | |
8bb54ab5 AS |
827 | /* interface drivers never match devices */ |
828 | if (!is_usb_device_driver(drv)) | |
829 | return 0; | |
ddae41be | 830 | |
88b7381a BN |
831 | udev = to_usb_device(dev); |
832 | udrv = to_usb_device_driver(drv); | |
833 | ||
834 | if (udrv->id_table && | |
835 | usb_device_match_id(udev, udrv->id_table) != NULL) { | |
836 | return 1; | |
837 | } | |
838 | ||
839 | if (udrv->match) | |
840 | return udrv->match(udev); | |
841 | return 0; | |
ddae41be | 842 | |
55129666 | 843 | } else if (is_usb_interface(dev)) { |
8bb54ab5 AS |
844 | struct usb_interface *intf; |
845 | struct usb_driver *usb_drv; | |
846 | const struct usb_device_id *id; | |
847 | ||
848 | /* device drivers never match interfaces */ | |
849 | if (is_usb_device_driver(drv)) | |
850 | return 0; | |
851 | ||
852 | intf = to_usb_interface(dev); | |
853 | usb_drv = to_usb_driver(drv); | |
854 | ||
855 | id = usb_match_id(intf, usb_drv->id_table); | |
856 | if (id) | |
857 | return 1; | |
858 | ||
859 | id = usb_match_dynamic_id(intf, usb_drv); | |
860 | if (id) | |
861 | return 1; | |
862 | } | |
863 | ||
ddae41be GKH |
864 | return 0; |
865 | } | |
866 | ||
7eff2e7a | 867 | static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
36e56a34 | 868 | { |
36e56a34 | 869 | struct usb_device *usb_dev; |
36e56a34 | 870 | |
55129666 | 871 | if (is_usb_device(dev)) { |
782da727 | 872 | usb_dev = to_usb_device(dev); |
55129666 | 873 | } else if (is_usb_interface(dev)) { |
9f8b17e6 | 874 | struct usb_interface *intf = to_usb_interface(dev); |
55129666 | 875 | |
8bb54ab5 | 876 | usb_dev = interface_to_usbdev(intf); |
55129666 KS |
877 | } else { |
878 | return 0; | |
8bb54ab5 | 879 | } |
36e56a34 AS |
880 | |
881 | if (usb_dev->devnum < 0) { | |
cceffe93 | 882 | /* driver is often null here; dev_dbg() would oops */ |
7071a3ce | 883 | pr_debug("usb %s: already deleted?\n", dev_name(dev)); |
36e56a34 AS |
884 | return -ENODEV; |
885 | } | |
886 | if (!usb_dev->bus) { | |
7071a3ce | 887 | pr_debug("usb %s: bus removed?\n", dev_name(dev)); |
36e56a34 AS |
888 | return -ENODEV; |
889 | } | |
890 | ||
36e56a34 | 891 | /* per-device configurations are common */ |
7eff2e7a | 892 | if (add_uevent_var(env, "PRODUCT=%x/%x/%x", |
36e56a34 AS |
893 | le16_to_cpu(usb_dev->descriptor.idVendor), |
894 | le16_to_cpu(usb_dev->descriptor.idProduct), | |
895 | le16_to_cpu(usb_dev->descriptor.bcdDevice))) | |
896 | return -ENOMEM; | |
897 | ||
898 | /* class-based driver binding models */ | |
7eff2e7a | 899 | if (add_uevent_var(env, "TYPE=%d/%d/%d", |
36e56a34 AS |
900 | usb_dev->descriptor.bDeviceClass, |
901 | usb_dev->descriptor.bDeviceSubClass, | |
902 | usb_dev->descriptor.bDeviceProtocol)) | |
903 | return -ENOMEM; | |
904 | ||
36e56a34 AS |
905 | return 0; |
906 | } | |
907 | ||
ddae41be | 908 | /** |
8bb54ab5 AS |
909 | * usb_register_device_driver - register a USB device (not interface) driver |
910 | * @new_udriver: USB operations for the device driver | |
2143acc6 | 911 | * @owner: module owner of this driver. |
ddae41be | 912 | * |
8bb54ab5 AS |
913 | * Registers a USB device driver with the USB core. The list of |
914 | * unattached devices will be rescanned whenever a new driver is | |
915 | * added, allowing the new driver to attach to any recognized devices. | |
626f090c YB |
916 | * |
917 | * Return: A negative error code on failure and 0 on success. | |
8bb54ab5 AS |
918 | */ |
919 | int usb_register_device_driver(struct usb_device_driver *new_udriver, | |
920 | struct module *owner) | |
921 | { | |
922 | int retval = 0; | |
923 | ||
924 | if (usb_disabled()) | |
925 | return -ENODEV; | |
926 | ||
927 | new_udriver->drvwrap.for_devices = 1; | |
9f9af82f | 928 | new_udriver->drvwrap.driver.name = new_udriver->name; |
8bb54ab5 AS |
929 | new_udriver->drvwrap.driver.bus = &usb_bus_type; |
930 | new_udriver->drvwrap.driver.probe = usb_probe_device; | |
931 | new_udriver->drvwrap.driver.remove = usb_unbind_device; | |
932 | new_udriver->drvwrap.driver.owner = owner; | |
7d9c1d2f | 933 | new_udriver->drvwrap.driver.dev_groups = new_udriver->dev_groups; |
8bb54ab5 AS |
934 | |
935 | retval = driver_register(&new_udriver->drvwrap.driver); | |
936 | ||
fb28d58b | 937 | if (!retval) |
8bb54ab5 AS |
938 | pr_info("%s: registered new device driver %s\n", |
939 | usbcore_name, new_udriver->name); | |
fb28d58b | 940 | else |
8bb54ab5 AS |
941 | printk(KERN_ERR "%s: error %d registering device " |
942 | " driver %s\n", | |
943 | usbcore_name, retval, new_udriver->name); | |
8bb54ab5 AS |
944 | |
945 | return retval; | |
946 | } | |
947 | EXPORT_SYMBOL_GPL(usb_register_device_driver); | |
948 | ||
949 | /** | |
950 | * usb_deregister_device_driver - unregister a USB device (not interface) driver | |
951 | * @udriver: USB operations of the device driver to unregister | |
952 | * Context: must be able to sleep | |
953 | * | |
954 | * Unlinks the specified driver from the internal USB driver list. | |
955 | */ | |
956 | void usb_deregister_device_driver(struct usb_device_driver *udriver) | |
957 | { | |
958 | pr_info("%s: deregistering device driver %s\n", | |
959 | usbcore_name, udriver->name); | |
960 | ||
961 | driver_unregister(&udriver->drvwrap.driver); | |
8bb54ab5 AS |
962 | } |
963 | EXPORT_SYMBOL_GPL(usb_deregister_device_driver); | |
964 | ||
965 | /** | |
966 | * usb_register_driver - register a USB interface driver | |
967 | * @new_driver: USB operations for the interface driver | |
968 | * @owner: module owner of this driver. | |
892705a1 | 969 | * @mod_name: module name string |
8bb54ab5 AS |
970 | * |
971 | * Registers a USB interface driver with the USB core. The list of | |
972 | * unattached interfaces will be rescanned whenever a new driver is | |
973 | * added, allowing the new driver to attach to any recognized interfaces. | |
626f090c YB |
974 | * |
975 | * Return: A negative error code on failure and 0 on success. | |
ddae41be GKH |
976 | * |
977 | * NOTE: if you want your driver to use the USB major number, you must call | |
978 | * usb_register_dev() to enable that functionality. This function no longer | |
979 | * takes care of that. | |
980 | */ | |
80f745fb GKH |
981 | int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
982 | const char *mod_name) | |
ddae41be GKH |
983 | { |
984 | int retval = 0; | |
985 | ||
986 | if (usb_disabled()) | |
987 | return -ENODEV; | |
988 | ||
8bb54ab5 | 989 | new_driver->drvwrap.for_devices = 0; |
9f9af82f | 990 | new_driver->drvwrap.driver.name = new_driver->name; |
8bb54ab5 AS |
991 | new_driver->drvwrap.driver.bus = &usb_bus_type; |
992 | new_driver->drvwrap.driver.probe = usb_probe_interface; | |
993 | new_driver->drvwrap.driver.remove = usb_unbind_interface; | |
994 | new_driver->drvwrap.driver.owner = owner; | |
80f745fb | 995 | new_driver->drvwrap.driver.mod_name = mod_name; |
b71b283e | 996 | new_driver->drvwrap.driver.dev_groups = new_driver->dev_groups; |
733260ff GKH |
997 | spin_lock_init(&new_driver->dynids.lock); |
998 | INIT_LIST_HEAD(&new_driver->dynids.list); | |
ddae41be | 999 | |
8bb54ab5 | 1000 | retval = driver_register(&new_driver->drvwrap.driver); |
0c7a2b72 CR |
1001 | if (retval) |
1002 | goto out; | |
ddae41be | 1003 | |
ed283e9f | 1004 | retval = usb_create_newid_files(new_driver); |
0c7a2b72 CR |
1005 | if (retval) |
1006 | goto out_newid; | |
1007 | ||
0c7a2b72 | 1008 | pr_info("%s: registered new interface driver %s\n", |
ddae41be | 1009 | usbcore_name, new_driver->name); |
ddae41be | 1010 | |
0c7a2b72 | 1011 | out: |
ddae41be | 1012 | return retval; |
0c7a2b72 | 1013 | |
0c7a2b72 CR |
1014 | out_newid: |
1015 | driver_unregister(&new_driver->drvwrap.driver); | |
1016 | ||
1017 | printk(KERN_ERR "%s: error %d registering interface " | |
1018 | " driver %s\n", | |
1019 | usbcore_name, retval, new_driver->name); | |
1020 | goto out; | |
ddae41be | 1021 | } |
782e70c6 | 1022 | EXPORT_SYMBOL_GPL(usb_register_driver); |
ddae41be GKH |
1023 | |
1024 | /** | |
8bb54ab5 AS |
1025 | * usb_deregister - unregister a USB interface driver |
1026 | * @driver: USB operations of the interface driver to unregister | |
ddae41be GKH |
1027 | * Context: must be able to sleep |
1028 | * | |
1029 | * Unlinks the specified driver from the internal USB driver list. | |
1030 | * | |
1031 | * NOTE: If you called usb_register_dev(), you still need to call | |
1032 | * usb_deregister_dev() to clean up your driver's allocated minor numbers, | |
1033 | * this * call will no longer do it for you. | |
1034 | */ | |
1035 | void usb_deregister(struct usb_driver *driver) | |
1036 | { | |
8bb54ab5 AS |
1037 | pr_info("%s: deregistering interface driver %s\n", |
1038 | usbcore_name, driver->name); | |
ddae41be | 1039 | |
ed283e9f | 1040 | usb_remove_newid_files(driver); |
8bb54ab5 | 1041 | driver_unregister(&driver->drvwrap.driver); |
ed283e9f | 1042 | usb_free_dynids(driver); |
ddae41be | 1043 | } |
782e70c6 | 1044 | EXPORT_SYMBOL_GPL(usb_deregister); |
36e56a34 | 1045 | |
78d9a487 AS |
1046 | /* Forced unbinding of a USB interface driver, either because |
1047 | * it doesn't support pre_reset/post_reset/reset_resume or | |
1048 | * because it doesn't support suspend/resume. | |
1049 | * | |
6aec044c | 1050 | * The caller must hold @intf's device's lock, but not @intf's lock. |
78d9a487 AS |
1051 | */ |
1052 | void usb_forced_unbind_intf(struct usb_interface *intf) | |
1053 | { | |
1054 | struct usb_driver *driver = to_usb_driver(intf->dev.driver); | |
1055 | ||
1056 | dev_dbg(&intf->dev, "forced unbind\n"); | |
1057 | usb_driver_release_interface(driver, intf); | |
1058 | ||
1059 | /* Mark the interface for later rebinding */ | |
1060 | intf->needs_binding = 1; | |
1061 | } | |
1062 | ||
6aec044c AS |
1063 | /* |
1064 | * Unbind drivers for @udev's marked interfaces. These interfaces have | |
1065 | * the needs_binding flag set, for example by usb_resume_interface(). | |
1066 | * | |
1067 | * The caller must hold @udev's device lock. | |
1068 | */ | |
1069 | static void unbind_marked_interfaces(struct usb_device *udev) | |
1070 | { | |
1071 | struct usb_host_config *config; | |
1072 | int i; | |
1073 | struct usb_interface *intf; | |
1074 | ||
1075 | config = udev->actconfig; | |
1076 | if (config) { | |
1077 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
1078 | intf = config->interface[i]; | |
1079 | if (intf->dev.driver && intf->needs_binding) | |
1080 | usb_forced_unbind_intf(intf); | |
1081 | } | |
1082 | } | |
1083 | } | |
1084 | ||
78d9a487 AS |
1085 | /* Delayed forced unbinding of a USB interface driver and scan |
1086 | * for rebinding. | |
1087 | * | |
6aec044c | 1088 | * The caller must hold @intf's device's lock, but not @intf's lock. |
78d9a487 | 1089 | * |
5096aedc AS |
1090 | * Note: Rebinds will be skipped if a system sleep transition is in |
1091 | * progress and the PM "complete" callback hasn't occurred yet. | |
78d9a487 | 1092 | */ |
6aec044c | 1093 | static void usb_rebind_intf(struct usb_interface *intf) |
78d9a487 AS |
1094 | { |
1095 | int rc; | |
1096 | ||
1097 | /* Delayed unbind of an existing driver */ | |
1493138a ON |
1098 | if (intf->dev.driver) |
1099 | usb_forced_unbind_intf(intf); | |
78d9a487 AS |
1100 | |
1101 | /* Try to rebind the interface */ | |
f76b168b | 1102 | if (!intf->dev.power.is_prepared) { |
5096aedc AS |
1103 | intf->needs_binding = 0; |
1104 | rc = device_attach(&intf->dev); | |
c0f3ed87 | 1105 | if (rc < 0 && rc != -EPROBE_DEFER) |
5096aedc AS |
1106 | dev_warn(&intf->dev, "rebind failed: %d\n", rc); |
1107 | } | |
78d9a487 AS |
1108 | } |
1109 | ||
6aec044c AS |
1110 | /* |
1111 | * Rebind drivers to @udev's marked interfaces. These interfaces have | |
1112 | * the needs_binding flag set. | |
78d9a487 AS |
1113 | * |
1114 | * The caller must hold @udev's device lock. | |
78d9a487 | 1115 | */ |
6aec044c | 1116 | static void rebind_marked_interfaces(struct usb_device *udev) |
78d9a487 AS |
1117 | { |
1118 | struct usb_host_config *config; | |
1119 | int i; | |
1120 | struct usb_interface *intf; | |
78d9a487 AS |
1121 | |
1122 | config = udev->actconfig; | |
1123 | if (config) { | |
1124 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
1125 | intf = config->interface[i]; | |
6aec044c AS |
1126 | if (intf->needs_binding) |
1127 | usb_rebind_intf(intf); | |
78d9a487 AS |
1128 | } |
1129 | } | |
1130 | } | |
1131 | ||
6aec044c AS |
1132 | /* |
1133 | * Unbind all of @udev's marked interfaces and then rebind all of them. | |
1134 | * This ordering is necessary because some drivers claim several interfaces | |
1135 | * when they are first probed. | |
1493138a ON |
1136 | * |
1137 | * The caller must hold @udev's device lock. | |
1138 | */ | |
6aec044c | 1139 | void usb_unbind_and_rebind_marked_interfaces(struct usb_device *udev) |
1493138a | 1140 | { |
6aec044c AS |
1141 | unbind_marked_interfaces(udev); |
1142 | rebind_marked_interfaces(udev); | |
1493138a ON |
1143 | } |
1144 | ||
6aec044c AS |
1145 | #ifdef CONFIG_PM |
1146 | ||
1147 | /* Unbind drivers for @udev's interfaces that don't support suspend/resume | |
1148 | * There is no check for reset_resume here because it can be determined | |
1149 | * only during resume whether reset_resume is needed. | |
1150 | * | |
1151 | * The caller must hold @udev's device lock. | |
1152 | */ | |
1153 | static void unbind_no_pm_drivers_interfaces(struct usb_device *udev) | |
1493138a ON |
1154 | { |
1155 | struct usb_host_config *config; | |
1156 | int i; | |
1157 | struct usb_interface *intf; | |
6aec044c | 1158 | struct usb_driver *drv; |
1493138a ON |
1159 | |
1160 | config = udev->actconfig; | |
1161 | if (config) { | |
1162 | for (i = 0; i < config->desc.bNumInterfaces; ++i) { | |
1163 | intf = config->interface[i]; | |
6aec044c AS |
1164 | |
1165 | if (intf->dev.driver) { | |
1166 | drv = to_usb_driver(intf->dev.driver); | |
1167 | if (!drv->suspend || !drv->resume) | |
1168 | usb_forced_unbind_intf(intf); | |
1169 | } | |
1493138a ON |
1170 | } |
1171 | } | |
1172 | } | |
1173 | ||
d5ec1686 | 1174 | static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) |
36e56a34 | 1175 | { |
782da727 | 1176 | struct usb_device_driver *udriver; |
2bf4086d | 1177 | int status = 0; |
36e56a34 | 1178 | |
114b368c AS |
1179 | if (udev->state == USB_STATE_NOTATTACHED || |
1180 | udev->state == USB_STATE_SUSPENDED) | |
1181 | goto done; | |
1182 | ||
b6f6436d AS |
1183 | /* For devices that don't have a driver, we do a generic suspend. */ |
1184 | if (udev->dev.driver) | |
1185 | udriver = to_usb_device_driver(udev->dev.driver); | |
1186 | else { | |
645daaab | 1187 | udev->do_remote_wakeup = 0; |
b6f6436d | 1188 | udriver = &usb_generic_driver; |
1c5df7e7 | 1189 | } |
c9d50337 BN |
1190 | if (udriver->suspend) |
1191 | status = udriver->suspend(udev, msg); | |
1192 | if (status == 0 && udriver->generic_subclass) | |
1193 | status = usb_generic_driver_suspend(udev, msg); | |
2bf4086d | 1194 | |
20dfdad7 | 1195 | done: |
441b62c1 | 1196 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1197 | return status; |
1cc8a25d AS |
1198 | } |
1199 | ||
65bfd296 | 1200 | static int usb_resume_device(struct usb_device *udev, pm_message_t msg) |
1cc8a25d AS |
1201 | { |
1202 | struct usb_device_driver *udriver; | |
2bf4086d | 1203 | int status = 0; |
36e56a34 | 1204 | |
0458d5b4 AS |
1205 | if (udev->state == USB_STATE_NOTATTACHED) |
1206 | goto done; | |
1cc8a25d | 1207 | |
1c5df7e7 AS |
1208 | /* Can't resume it if it doesn't have a driver. */ |
1209 | if (udev->dev.driver == NULL) { | |
1210 | status = -ENOTCONN; | |
2bf4086d | 1211 | goto done; |
1c5df7e7 AS |
1212 | } |
1213 | ||
6d19c009 AS |
1214 | /* Non-root devices on a full/low-speed bus must wait for their |
1215 | * companion high-speed root hub, in case a handoff is needed. | |
1216 | */ | |
5b1b0b81 | 1217 | if (!PMSG_IS_AUTO(msg) && udev->parent && udev->bus->hs_companion) |
6d19c009 AS |
1218 | device_pm_wait_for_dev(&udev->dev, |
1219 | &udev->bus->hs_companion->root_hub->dev); | |
1220 | ||
6bc6cff5 AS |
1221 | if (udev->quirks & USB_QUIRK_RESET_RESUME) |
1222 | udev->reset_resume = 1; | |
1223 | ||
1cc8a25d | 1224 | udriver = to_usb_device_driver(udev->dev.driver); |
c9d50337 BN |
1225 | if (udriver->generic_subclass) |
1226 | status = usb_generic_driver_resume(udev, msg); | |
1227 | if (status == 0 && udriver->resume) | |
1228 | status = udriver->resume(udev, msg); | |
2bf4086d | 1229 | |
20dfdad7 | 1230 | done: |
441b62c1 | 1231 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
2bf4086d | 1232 | return status; |
1cc8a25d AS |
1233 | } |
1234 | ||
65605ae8 AS |
1235 | static int usb_suspend_interface(struct usb_device *udev, |
1236 | struct usb_interface *intf, pm_message_t msg) | |
1cc8a25d AS |
1237 | { |
1238 | struct usb_driver *driver; | |
2bf4086d | 1239 | int status = 0; |
1cc8a25d | 1240 | |
9bbdf1e0 AS |
1241 | if (udev->state == USB_STATE_NOTATTACHED || |
1242 | intf->condition == USB_INTERFACE_UNBOUND) | |
2bf4086d | 1243 | goto done; |
114b368c | 1244 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1245 | |
e78832cd ON |
1246 | /* at this time we know the driver supports suspend */ |
1247 | status = driver->suspend(intf, msg); | |
1248 | if (status && !PMSG_IS_AUTO(msg)) | |
1249 | dev_err(&intf->dev, "suspend error %d\n", status); | |
2bf4086d | 1250 | |
20dfdad7 | 1251 | done: |
441b62c1 | 1252 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
36e56a34 AS |
1253 | return status; |
1254 | } | |
1255 | ||
65605ae8 | 1256 | static int usb_resume_interface(struct usb_device *udev, |
65bfd296 | 1257 | struct usb_interface *intf, pm_message_t msg, int reset_resume) |
36e56a34 | 1258 | { |
1cc8a25d | 1259 | struct usb_driver *driver; |
2bf4086d | 1260 | int status = 0; |
36e56a34 | 1261 | |
9bbdf1e0 | 1262 | if (udev->state == USB_STATE_NOTATTACHED) |
2bf4086d | 1263 | goto done; |
36e56a34 | 1264 | |
645daaab AS |
1265 | /* Don't let autoresume interfere with unbinding */ |
1266 | if (intf->condition == USB_INTERFACE_UNBINDING) | |
1267 | goto done; | |
1268 | ||
1c5df7e7 | 1269 | /* Can't resume it if it doesn't have a driver. */ |
55151d7d AS |
1270 | if (intf->condition == USB_INTERFACE_UNBOUND) { |
1271 | ||
1272 | /* Carry out a deferred switch to altsetting 0 */ | |
f76b168b | 1273 | if (intf->needs_altsetting0 && !intf->dev.power.is_prepared) { |
55151d7d AS |
1274 | usb_set_interface(udev, intf->altsetting[0]. |
1275 | desc.bInterfaceNumber, 0); | |
1276 | intf->needs_altsetting0 = 0; | |
1277 | } | |
78d9a487 | 1278 | goto done; |
55151d7d | 1279 | } |
78d9a487 AS |
1280 | |
1281 | /* Don't resume if the interface is marked for rebinding */ | |
1282 | if (intf->needs_binding) | |
2bf4086d | 1283 | goto done; |
1cc8a25d | 1284 | driver = to_usb_driver(intf->dev.driver); |
36e56a34 | 1285 | |
f07600cf AS |
1286 | if (reset_resume) { |
1287 | if (driver->reset_resume) { | |
1288 | status = driver->reset_resume(intf); | |
1289 | if (status) | |
1290 | dev_err(&intf->dev, "%s error %d\n", | |
1291 | "reset_resume", status); | |
1292 | } else { | |
78d9a487 | 1293 | intf->needs_binding = 1; |
0a56b4fa AS |
1294 | dev_dbg(&intf->dev, "no reset_resume for driver %s?\n", |
1295 | driver->name); | |
f07600cf AS |
1296 | } |
1297 | } else { | |
e78832cd ON |
1298 | status = driver->resume(intf); |
1299 | if (status) | |
1300 | dev_err(&intf->dev, "resume error %d\n", status); | |
f07600cf | 1301 | } |
2bf4086d AS |
1302 | |
1303 | done: | |
441b62c1 | 1304 | dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
f07600cf | 1305 | |
78d9a487 | 1306 | /* Later we will unbind the driver and/or reprobe, if necessary */ |
2bf4086d | 1307 | return status; |
36e56a34 AS |
1308 | } |
1309 | ||
645daaab AS |
1310 | /** |
1311 | * usb_suspend_both - suspend a USB device and its interfaces | |
1312 | * @udev: the usb_device to suspend | |
1313 | * @msg: Power Management message describing this state transition | |
1314 | * | |
1315 | * This is the central routine for suspending USB devices. It calls the | |
1316 | * suspend methods for all the interface drivers in @udev and then calls | |
303f0847 ML |
1317 | * the suspend method for @udev itself. When the routine is called in |
1318 | * autosuspend, if an error occurs at any stage, all the interfaces | |
1319 | * which were suspended are resumed so that they remain in the same | |
1320 | * state as the device, but when called from system sleep, all error | |
1321 | * from suspend methods of interfaces and the non-root-hub device itself | |
1322 | * are simply ignored, so all suspended interfaces are only resumed | |
1323 | * to the device's state when @udev is root-hub and its suspend method | |
1324 | * returns failure. | |
645daaab | 1325 | * |
9bbdf1e0 AS |
1326 | * Autosuspend requests originating from a child device or an interface |
1327 | * driver may be made without the protection of @udev's device lock, but | |
1328 | * all other suspend calls will hold the lock. Usbcore will insure that | |
1329 | * method calls do not arrive during bind, unbind, or reset operations. | |
1330 | * However drivers must be prepared to handle suspend calls arriving at | |
1331 | * unpredictable times. | |
645daaab AS |
1332 | * |
1333 | * This routine can run only in process context. | |
626f090c YB |
1334 | * |
1335 | * Return: 0 if the suspend succeeded. | |
645daaab | 1336 | */ |
718efa64 | 1337 | static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 AS |
1338 | { |
1339 | int status = 0; | |
571dc79d | 1340 | int i = 0, n = 0; |
a8e7c565 | 1341 | struct usb_interface *intf; |
645daaab | 1342 | |
1941044a AS |
1343 | if (udev->state == USB_STATE_NOTATTACHED || |
1344 | udev->state == USB_STATE_SUSPENDED) | |
1345 | goto done; | |
a8e7c565 | 1346 | |
645daaab | 1347 | /* Suspend all the interfaces and then udev itself */ |
a8e7c565 | 1348 | if (udev->actconfig) { |
571dc79d AS |
1349 | n = udev->actconfig->desc.bNumInterfaces; |
1350 | for (i = n - 1; i >= 0; --i) { | |
a8e7c565 | 1351 | intf = udev->actconfig->interface[i]; |
65605ae8 | 1352 | status = usb_suspend_interface(udev, intf, msg); |
0af212ba AS |
1353 | |
1354 | /* Ignore errors during system sleep transitions */ | |
5b1b0b81 | 1355 | if (!PMSG_IS_AUTO(msg)) |
0af212ba | 1356 | status = 0; |
a8e7c565 AS |
1357 | if (status != 0) |
1358 | break; | |
1359 | } | |
1360 | } | |
0af212ba | 1361 | if (status == 0) { |
d5ec1686 | 1362 | status = usb_suspend_device(udev, msg); |
a8e7c565 | 1363 | |
cd4376e2 AS |
1364 | /* |
1365 | * Ignore errors from non-root-hub devices during | |
1366 | * system sleep transitions. For the most part, | |
1367 | * these devices should go to low power anyway when | |
1368 | * the entire bus is suspended. | |
1369 | */ | |
1370 | if (udev->parent && !PMSG_IS_AUTO(msg)) | |
0af212ba | 1371 | status = 0; |
245b2eec GR |
1372 | |
1373 | /* | |
1374 | * If the device is inaccessible, don't try to resume | |
1375 | * suspended interfaces and just return the error. | |
1376 | */ | |
1377 | if (status && status != -EBUSY) { | |
1378 | int err; | |
1379 | u16 devstat; | |
1380 | ||
d9e1e148 FB |
1381 | err = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, |
1382 | &devstat); | |
245b2eec GR |
1383 | if (err) { |
1384 | dev_err(&udev->dev, | |
1385 | "Failed to suspend device, error %d\n", | |
1386 | status); | |
1387 | goto done; | |
1388 | } | |
1389 | } | |
0af212ba AS |
1390 | } |
1391 | ||
a8e7c565 AS |
1392 | /* If the suspend failed, resume interfaces that did get suspended */ |
1393 | if (status != 0) { | |
505bdbc7 CG |
1394 | if (udev->actconfig) { |
1395 | msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); | |
1396 | while (++i < n) { | |
1397 | intf = udev->actconfig->interface[i]; | |
1398 | usb_resume_interface(udev, intf, msg, 0); | |
1399 | } | |
a8e7c565 | 1400 | } |
645daaab | 1401 | |
9bbdf1e0 AS |
1402 | /* If the suspend succeeded then prevent any more URB submissions |
1403 | * and flush any outstanding URBs. | |
6840d255 | 1404 | */ |
ef7f6c70 | 1405 | } else { |
6840d255 AS |
1406 | udev->can_submit = 0; |
1407 | for (i = 0; i < 16; ++i) { | |
1408 | usb_hcd_flush_endpoint(udev, udev->ep_out[i]); | |
1409 | usb_hcd_flush_endpoint(udev, udev->ep_in[i]); | |
1410 | } | |
ef7f6c70 | 1411 | } |
645daaab | 1412 | |
1941044a | 1413 | done: |
441b62c1 | 1414 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
a8e7c565 AS |
1415 | return status; |
1416 | } | |
1417 | ||
645daaab AS |
1418 | /** |
1419 | * usb_resume_both - resume a USB device and its interfaces | |
1420 | * @udev: the usb_device to resume | |
65bfd296 | 1421 | * @msg: Power Management message describing this state transition |
645daaab AS |
1422 | * |
1423 | * This is the central routine for resuming USB devices. It calls the | |
1424 | * the resume method for @udev and then calls the resume methods for all | |
1425 | * the interface drivers in @udev. | |
1426 | * | |
9bbdf1e0 AS |
1427 | * Autoresume requests originating from a child device or an interface |
1428 | * driver may be made without the protection of @udev's device lock, but | |
1429 | * all other resume calls will hold the lock. Usbcore will insure that | |
1430 | * method calls do not arrive during bind, unbind, or reset operations. | |
1431 | * However drivers must be prepared to handle resume calls arriving at | |
1432 | * unpredictable times. | |
645daaab AS |
1433 | * |
1434 | * This routine can run only in process context. | |
626f090c YB |
1435 | * |
1436 | * Return: 0 on success. | |
645daaab | 1437 | */ |
65bfd296 | 1438 | static int usb_resume_both(struct usb_device *udev, pm_message_t msg) |
a8e7c565 | 1439 | { |
645daaab | 1440 | int status = 0; |
a8e7c565 AS |
1441 | int i; |
1442 | struct usb_interface *intf; | |
645daaab | 1443 | |
1941044a AS |
1444 | if (udev->state == USB_STATE_NOTATTACHED) { |
1445 | status = -ENODEV; | |
1446 | goto done; | |
1447 | } | |
6840d255 | 1448 | udev->can_submit = 1; |
a8e7c565 | 1449 | |
9bbdf1e0 AS |
1450 | /* Resume the device */ |
1451 | if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume) | |
65bfd296 | 1452 | status = usb_resume_device(udev, msg); |
114b368c | 1453 | |
9bbdf1e0 | 1454 | /* Resume the interfaces */ |
a8e7c565 AS |
1455 | if (status == 0 && udev->actconfig) { |
1456 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1457 | intf = udev->actconfig->interface[i]; | |
65bfd296 AS |
1458 | usb_resume_interface(udev, intf, msg, |
1459 | udev->reset_resume); | |
a8e7c565 AS |
1460 | } |
1461 | } | |
c08512c7 | 1462 | usb_mark_last_busy(udev); |
645daaab | 1463 | |
1941044a | 1464 | done: |
441b62c1 | 1465 | dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
70a1c9e0 AS |
1466 | if (!status) |
1467 | udev->reset_resume = 0; | |
645daaab AS |
1468 | return status; |
1469 | } | |
1470 | ||
5f677f1d AS |
1471 | static void choose_wakeup(struct usb_device *udev, pm_message_t msg) |
1472 | { | |
48826626 | 1473 | int w; |
5f677f1d AS |
1474 | |
1475 | /* Remote wakeup is needed only when we actually go to sleep. | |
1476 | * For things like FREEZE and QUIESCE, if the device is already | |
1477 | * autosuspended then its current wakeup setting is okay. | |
1478 | */ | |
1479 | if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) { | |
1480 | if (udev->state != USB_STATE_SUSPENDED) | |
1481 | udev->do_remote_wakeup = 0; | |
1482 | return; | |
1483 | } | |
1484 | ||
48826626 | 1485 | /* Enable remote wakeup if it is allowed, even if no interface drivers |
5f677f1d AS |
1486 | * actually want it. |
1487 | */ | |
48826626 | 1488 | w = device_may_wakeup(&udev->dev); |
5f677f1d AS |
1489 | |
1490 | /* If the device is autosuspended with the wrong wakeup setting, | |
1491 | * autoresume now so the setting can be changed. | |
1492 | */ | |
1493 | if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup) | |
1494 | pm_runtime_resume(&udev->dev); | |
1495 | udev->do_remote_wakeup = w; | |
1496 | } | |
1497 | ||
9bbdf1e0 | 1498 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1499 | int usb_suspend(struct device *dev, pm_message_t msg) |
1500 | { | |
9bbdf1e0 | 1501 | struct usb_device *udev = to_usb_device(dev); |
8dd8d2c9 | 1502 | int r; |
0c590e23 | 1503 | |
1493138a ON |
1504 | unbind_no_pm_drivers_interfaces(udev); |
1505 | ||
1506 | /* From now on we are sure all drivers support suspend/resume | |
1507 | * but not necessarily reset_resume() | |
1508 | * so we may still need to unbind and rebind upon resume | |
1509 | */ | |
5f677f1d | 1510 | choose_wakeup(udev, msg); |
8dd8d2c9 DD |
1511 | r = usb_suspend_both(udev, msg); |
1512 | if (r) | |
1513 | return r; | |
1514 | ||
1515 | if (udev->quirks & USB_QUIRK_DISCONNECT_SUSPEND) | |
1516 | usb_port_disable(udev); | |
1517 | ||
1518 | return 0; | |
0c590e23 AS |
1519 | } |
1520 | ||
9bbdf1e0 | 1521 | /* The device lock is held by the PM core */ |
98d9a82e | 1522 | int usb_resume_complete(struct device *dev) |
0c590e23 | 1523 | { |
98d9a82e | 1524 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 | 1525 | |
1493138a ON |
1526 | /* For PM complete calls, all we do is rebind interfaces |
1527 | * whose needs_binding flag is set | |
1528 | */ | |
98d9a82e | 1529 | if (udev->state != USB_STATE_NOTATTACHED) |
6aec044c | 1530 | rebind_marked_interfaces(udev); |
98d9a82e ON |
1531 | return 0; |
1532 | } | |
0c590e23 | 1533 | |
9bbdf1e0 | 1534 | /* The device lock is held by the PM core */ |
0c590e23 AS |
1535 | int usb_resume(struct device *dev, pm_message_t msg) |
1536 | { | |
9bbdf1e0 | 1537 | struct usb_device *udev = to_usb_device(dev); |
0c590e23 AS |
1538 | int status; |
1539 | ||
98d9a82e | 1540 | /* For all calls, take the device back to full power and |
9bbdf1e0 | 1541 | * tell the PM core in case it was autosuspended previously. |
1493138a ON |
1542 | * Unbind the interfaces that will need rebinding later, |
1543 | * because they fail to support reset_resume. | |
1544 | * (This can't be done in usb_resume_interface() | |
98d9a82e | 1545 | * above because it doesn't own the right set of locks.) |
0c590e23 | 1546 | */ |
98d9a82e ON |
1547 | status = usb_resume_both(udev, msg); |
1548 | if (status == 0) { | |
1549 | pm_runtime_disable(dev); | |
1550 | pm_runtime_set_active(dev); | |
1551 | pm_runtime_enable(dev); | |
6aec044c | 1552 | unbind_marked_interfaces(udev); |
9bbdf1e0 | 1553 | } |
0c590e23 AS |
1554 | |
1555 | /* Avoid PM error messages for devices disconnected while suspended | |
1556 | * as we'll display regular disconnect messages just a bit later. | |
1557 | */ | |
7491f133 | 1558 | if (status == -ENODEV || status == -ESHUTDOWN) |
9bbdf1e0 | 1559 | status = 0; |
0c590e23 AS |
1560 | return status; |
1561 | } | |
1562 | ||
088f7fec AS |
1563 | /** |
1564 | * usb_enable_autosuspend - allow a USB device to be autosuspended | |
1565 | * @udev: the USB device which may be autosuspended | |
1566 | * | |
1567 | * This routine allows @udev to be autosuspended. An autosuspend won't | |
1568 | * take place until the autosuspend_delay has elapsed and all the other | |
1569 | * necessary conditions are satisfied. | |
1570 | * | |
1571 | * The caller must hold @udev's device lock. | |
1572 | */ | |
9e18c821 | 1573 | void usb_enable_autosuspend(struct usb_device *udev) |
088f7fec | 1574 | { |
9e18c821 | 1575 | pm_runtime_allow(&udev->dev); |
088f7fec AS |
1576 | } |
1577 | EXPORT_SYMBOL_GPL(usb_enable_autosuspend); | |
1578 | ||
1579 | /** | |
1580 | * usb_disable_autosuspend - prevent a USB device from being autosuspended | |
1581 | * @udev: the USB device which may not be autosuspended | |
1582 | * | |
1583 | * This routine prevents @udev from being autosuspended and wakes it up | |
1584 | * if it is already autosuspended. | |
1585 | * | |
1586 | * The caller must hold @udev's device lock. | |
1587 | */ | |
9e18c821 | 1588 | void usb_disable_autosuspend(struct usb_device *udev) |
088f7fec | 1589 | { |
9e18c821 | 1590 | pm_runtime_forbid(&udev->dev); |
088f7fec AS |
1591 | } |
1592 | EXPORT_SYMBOL_GPL(usb_disable_autosuspend); | |
1593 | ||
645daaab AS |
1594 | /** |
1595 | * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces | |
701f35af | 1596 | * @udev: the usb_device to autosuspend |
645daaab AS |
1597 | * |
1598 | * This routine should be called when a core subsystem is finished using | |
1599 | * @udev and wants to allow it to autosuspend. Examples would be when | |
1600 | * @udev's device file in usbfs is closed or after a configuration change. | |
1601 | * | |
9bbdf1e0 AS |
1602 | * @udev's usage counter is decremented; if it drops to 0 and all the |
1603 | * interfaces are inactive then a delayed autosuspend will be attempted. | |
1604 | * The attempt may fail (see autosuspend_check()). | |
645daaab | 1605 | * |
62e299e6 | 1606 | * The caller must hold @udev's device lock. |
645daaab AS |
1607 | * |
1608 | * This routine can run only in process context. | |
1609 | */ | |
94fcda1f | 1610 | void usb_autosuspend_device(struct usb_device *udev) |
645daaab | 1611 | { |
94fcda1f AS |
1612 | int status; |
1613 | ||
6ddf27cd | 1614 | usb_mark_last_busy(udev); |
fcc4a01e | 1615 | status = pm_runtime_put_sync_autosuspend(&udev->dev); |
9bbdf1e0 AS |
1616 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", |
1617 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1618 | status); | |
645daaab AS |
1619 | } |
1620 | ||
1621 | /** | |
1622 | * usb_autoresume_device - immediately autoresume a USB device and its interfaces | |
701f35af | 1623 | * @udev: the usb_device to autoresume |
645daaab AS |
1624 | * |
1625 | * This routine should be called when a core subsystem wants to use @udev | |
94fcda1f | 1626 | * and needs to guarantee that it is not suspended. No autosuspend will |
9bbdf1e0 AS |
1627 | * occur until usb_autosuspend_device() is called. (Note that this will |
1628 | * not prevent suspend events originating in the PM core.) Examples would | |
1629 | * be when @udev's device file in usbfs is opened or when a remote-wakeup | |
94fcda1f | 1630 | * request is received. |
645daaab | 1631 | * |
94fcda1f AS |
1632 | * @udev's usage counter is incremented to prevent subsequent autosuspends. |
1633 | * However if the autoresume fails then the usage counter is re-decremented. | |
645daaab | 1634 | * |
62e299e6 | 1635 | * The caller must hold @udev's device lock. |
645daaab AS |
1636 | * |
1637 | * This routine can run only in process context. | |
626f090c YB |
1638 | * |
1639 | * Return: 0 on success. A negative error code otherwise. | |
645daaab | 1640 | */ |
94fcda1f | 1641 | int usb_autoresume_device(struct usb_device *udev) |
645daaab AS |
1642 | { |
1643 | int status; | |
1644 | ||
9bbdf1e0 AS |
1645 | status = pm_runtime_get_sync(&udev->dev); |
1646 | if (status < 0) | |
1647 | pm_runtime_put_sync(&udev->dev); | |
1648 | dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", | |
1649 | __func__, atomic_read(&udev->dev.power.usage_count), | |
1650 | status); | |
1651 | if (status > 0) | |
1652 | status = 0; | |
af4f7606 AS |
1653 | return status; |
1654 | } | |
1655 | ||
645daaab AS |
1656 | /** |
1657 | * usb_autopm_put_interface - decrement a USB interface's PM-usage counter | |
701f35af | 1658 | * @intf: the usb_interface whose counter should be decremented |
645daaab AS |
1659 | * |
1660 | * This routine should be called by an interface driver when it is | |
1661 | * finished using @intf and wants to allow it to autosuspend. A typical | |
1662 | * example would be a character-device driver when its device file is | |
1663 | * closed. | |
1664 | * | |
1665 | * The routine decrements @intf's usage counter. When the counter reaches | |
9bbdf1e0 AS |
1666 | * 0, a delayed autosuspend request for @intf's device is attempted. The |
1667 | * attempt may fail (see autosuspend_check()). | |
645daaab | 1668 | * |
645daaab AS |
1669 | * This routine can run only in process context. |
1670 | */ | |
1671 | void usb_autopm_put_interface(struct usb_interface *intf) | |
1672 | { | |
9bbdf1e0 AS |
1673 | struct usb_device *udev = interface_to_usbdev(intf); |
1674 | int status; | |
645daaab | 1675 | |
6ddf27cd | 1676 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1677 | status = pm_runtime_put_sync(&intf->dev); |
1678 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", | |
1679 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1680 | status); | |
645daaab AS |
1681 | } |
1682 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface); | |
1683 | ||
9ac39f28 AS |
1684 | /** |
1685 | * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter | |
1686 | * @intf: the usb_interface whose counter should be decremented | |
1687 | * | |
9bbdf1e0 AS |
1688 | * This routine does much the same thing as usb_autopm_put_interface(): |
1689 | * It decrements @intf's usage counter and schedules a delayed | |
1690 | * autosuspend request if the counter is <= 0. The difference is that it | |
1691 | * does not perform any synchronization; callers should hold a private | |
1692 | * lock and handle all synchronization issues themselves. | |
9ac39f28 AS |
1693 | * |
1694 | * Typically a driver would call this routine during an URB's completion | |
1695 | * handler, if no more URBs were pending. | |
1696 | * | |
1697 | * This routine can run in atomic context. | |
1698 | */ | |
1699 | void usb_autopm_put_interface_async(struct usb_interface *intf) | |
1700 | { | |
1701 | struct usb_device *udev = interface_to_usbdev(intf); | |
fcc4a01e | 1702 | int status; |
9ac39f28 | 1703 | |
6ddf27cd | 1704 | usb_mark_last_busy(udev); |
fcc4a01e | 1705 | status = pm_runtime_put(&intf->dev); |
9bbdf1e0 AS |
1706 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1707 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1708 | status); | |
9ac39f28 AS |
1709 | } |
1710 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async); | |
1711 | ||
9bbdf1e0 AS |
1712 | /** |
1713 | * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter | |
1714 | * @intf: the usb_interface whose counter should be decremented | |
1715 | * | |
1716 | * This routine decrements @intf's usage counter but does not carry out an | |
1717 | * autosuspend. | |
1718 | * | |
1719 | * This routine can run in atomic context. | |
1720 | */ | |
1721 | void usb_autopm_put_interface_no_suspend(struct usb_interface *intf) | |
1722 | { | |
1723 | struct usb_device *udev = interface_to_usbdev(intf); | |
1724 | ||
6ddf27cd | 1725 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1726 | pm_runtime_put_noidle(&intf->dev); |
1727 | } | |
1728 | EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend); | |
1729 | ||
645daaab AS |
1730 | /** |
1731 | * usb_autopm_get_interface - increment a USB interface's PM-usage counter | |
701f35af | 1732 | * @intf: the usb_interface whose counter should be incremented |
645daaab AS |
1733 | * |
1734 | * This routine should be called by an interface driver when it wants to | |
1735 | * use @intf and needs to guarantee that it is not suspended. In addition, | |
1736 | * the routine prevents @intf from being autosuspended subsequently. (Note | |
1737 | * that this will not prevent suspend events originating in the PM core.) | |
1738 | * This prevention will persist until usb_autopm_put_interface() is called | |
1739 | * or @intf is unbound. A typical example would be a character-device | |
1740 | * driver when its device file is opened. | |
1741 | * | |
9bbdf1e0 AS |
1742 | * @intf's usage counter is incremented to prevent subsequent autosuspends. |
1743 | * However if the autoresume fails then the counter is re-decremented. | |
645daaab AS |
1744 | * |
1745 | * This routine can run only in process context. | |
626f090c YB |
1746 | * |
1747 | * Return: 0 on success. | |
645daaab AS |
1748 | */ |
1749 | int usb_autopm_get_interface(struct usb_interface *intf) | |
1750 | { | |
af4f7606 | 1751 | int status; |
645daaab | 1752 | |
9bbdf1e0 AS |
1753 | status = pm_runtime_get_sync(&intf->dev); |
1754 | if (status < 0) | |
1755 | pm_runtime_put_sync(&intf->dev); | |
9bbdf1e0 AS |
1756 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1757 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1758 | status); | |
1759 | if (status > 0) | |
1760 | status = 0; | |
a8e7c565 AS |
1761 | return status; |
1762 | } | |
645daaab AS |
1763 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
1764 | ||
9ac39f28 AS |
1765 | /** |
1766 | * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter | |
1767 | * @intf: the usb_interface whose counter should be incremented | |
1768 | * | |
1769 | * This routine does much the same thing as | |
9bbdf1e0 AS |
1770 | * usb_autopm_get_interface(): It increments @intf's usage counter and |
1771 | * queues an autoresume request if the device is suspended. The | |
1772 | * differences are that it does not perform any synchronization (callers | |
1773 | * should hold a private lock and handle all synchronization issues | |
1774 | * themselves), and it does not autoresume the device directly (it only | |
1775 | * queues a request). After a successful call, the device may not yet be | |
1776 | * resumed. | |
9ac39f28 AS |
1777 | * |
1778 | * This routine can run in atomic context. | |
626f090c YB |
1779 | * |
1780 | * Return: 0 on success. A negative error code otherwise. | |
9ac39f28 AS |
1781 | */ |
1782 | int usb_autopm_get_interface_async(struct usb_interface *intf) | |
1783 | { | |
63defa73 | 1784 | int status; |
9bbdf1e0 | 1785 | |
63defa73 | 1786 | status = pm_runtime_get(&intf->dev); |
9bbdf1e0 AS |
1787 | if (status < 0 && status != -EINPROGRESS) |
1788 | pm_runtime_put_noidle(&intf->dev); | |
9bbdf1e0 AS |
1789 | dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
1790 | __func__, atomic_read(&intf->dev.power.usage_count), | |
1791 | status); | |
c5a48592 | 1792 | if (status > 0 || status == -EINPROGRESS) |
9bbdf1e0 | 1793 | status = 0; |
9ac39f28 AS |
1794 | return status; |
1795 | } | |
1796 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async); | |
1797 | ||
9bbdf1e0 AS |
1798 | /** |
1799 | * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter | |
1800 | * @intf: the usb_interface whose counter should be incremented | |
1801 | * | |
1802 | * This routine increments @intf's usage counter but does not carry out an | |
1803 | * autoresume. | |
1804 | * | |
1805 | * This routine can run in atomic context. | |
1806 | */ | |
1807 | void usb_autopm_get_interface_no_resume(struct usb_interface *intf) | |
1808 | { | |
1809 | struct usb_device *udev = interface_to_usbdev(intf); | |
1810 | ||
6ddf27cd | 1811 | usb_mark_last_busy(udev); |
9bbdf1e0 AS |
1812 | pm_runtime_get_noresume(&intf->dev); |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume); | |
1815 | ||
1816 | /* Internal routine to check whether we may autosuspend a device. */ | |
1817 | static int autosuspend_check(struct usb_device *udev) | |
1818 | { | |
7560d32e | 1819 | int w, i; |
9bbdf1e0 | 1820 | struct usb_interface *intf; |
9bbdf1e0 | 1821 | |
f5cccf49 GR |
1822 | if (udev->state == USB_STATE_NOTATTACHED) |
1823 | return -ENODEV; | |
1824 | ||
9bbdf1e0 AS |
1825 | /* Fail if autosuspend is disabled, or any interfaces are in use, or |
1826 | * any interface drivers require remote wakeup but it isn't available. | |
1827 | */ | |
7560d32e | 1828 | w = 0; |
9bbdf1e0 AS |
1829 | if (udev->actconfig) { |
1830 | for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { | |
1831 | intf = udev->actconfig->interface[i]; | |
1832 | ||
1833 | /* We don't need to check interfaces that are | |
1834 | * disabled for runtime PM. Either they are unbound | |
1835 | * or else their drivers don't support autosuspend | |
1836 | * and so they are permanently active. | |
1837 | */ | |
1838 | if (intf->dev.power.disable_depth) | |
1839 | continue; | |
1840 | if (atomic_read(&intf->dev.power.usage_count) > 0) | |
1841 | return -EBUSY; | |
7560d32e | 1842 | w |= intf->needs_remote_wakeup; |
9bbdf1e0 AS |
1843 | |
1844 | /* Don't allow autosuspend if the device will need | |
1845 | * a reset-resume and any of its interface drivers | |
1846 | * doesn't include support or needs remote wakeup. | |
1847 | */ | |
1848 | if (udev->quirks & USB_QUIRK_RESET_RESUME) { | |
1849 | struct usb_driver *driver; | |
1850 | ||
1851 | driver = to_usb_driver(intf->dev.driver); | |
1852 | if (!driver->reset_resume || | |
1853 | intf->needs_remote_wakeup) | |
1854 | return -EOPNOTSUPP; | |
1855 | } | |
1856 | } | |
1857 | } | |
7560d32e AS |
1858 | if (w && !device_can_wakeup(&udev->dev)) { |
1859 | dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); | |
1860 | return -EOPNOTSUPP; | |
1861 | } | |
074f9dd5 AS |
1862 | |
1863 | /* | |
1864 | * If the device is a direct child of the root hub and the HCD | |
1865 | * doesn't handle wakeup requests, don't allow autosuspend when | |
1866 | * wakeup is needed. | |
1867 | */ | |
1868 | if (w && udev->parent == udev->bus->root_hub && | |
1869 | bus_to_hcd(udev->bus)->cant_recv_wakeups) { | |
1870 | dev_dbg(&udev->dev, "HCD doesn't handle wakeup requests\n"); | |
1871 | return -EOPNOTSUPP; | |
1872 | } | |
1873 | ||
7560d32e | 1874 | udev->do_remote_wakeup = w; |
9bbdf1e0 AS |
1875 | return 0; |
1876 | } | |
1877 | ||
e1620d59 | 1878 | int usb_runtime_suspend(struct device *dev) |
9bbdf1e0 | 1879 | { |
63defa73 ML |
1880 | struct usb_device *udev = to_usb_device(dev); |
1881 | int status; | |
718efa64 | 1882 | |
9bbdf1e0 AS |
1883 | /* A USB device can be suspended if it passes the various autosuspend |
1884 | * checks. Runtime suspend for a USB device means suspending all the | |
1885 | * interfaces and then the device itself. | |
1886 | */ | |
63defa73 ML |
1887 | if (autosuspend_check(udev) != 0) |
1888 | return -EAGAIN; | |
9bbdf1e0 | 1889 | |
63defa73 | 1890 | status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); |
b2c0a863 AS |
1891 | |
1892 | /* Allow a retry if autosuspend failed temporarily */ | |
1893 | if (status == -EAGAIN || status == -EBUSY) | |
1894 | usb_mark_last_busy(udev); | |
1895 | ||
8ef42ddd AS |
1896 | /* |
1897 | * The PM core reacts badly unless the return code is 0, | |
1898 | * -EAGAIN, or -EBUSY, so always return -EBUSY on an error | |
1899 | * (except for root hubs, because they don't suspend through | |
1900 | * an upstream port like other USB devices). | |
db7c7c0a | 1901 | */ |
8ef42ddd | 1902 | if (status != 0 && udev->parent) |
db7c7c0a | 1903 | return -EBUSY; |
9bbdf1e0 AS |
1904 | return status; |
1905 | } | |
1906 | ||
e1620d59 | 1907 | int usb_runtime_resume(struct device *dev) |
9bbdf1e0 | 1908 | { |
63defa73 ML |
1909 | struct usb_device *udev = to_usb_device(dev); |
1910 | int status; | |
1911 | ||
9bbdf1e0 AS |
1912 | /* Runtime resume for a USB device means resuming both the device |
1913 | * and all its interfaces. | |
1914 | */ | |
63defa73 | 1915 | status = usb_resume_both(udev, PMSG_AUTO_RESUME); |
63defa73 | 1916 | return status; |
9bbdf1e0 AS |
1917 | } |
1918 | ||
e1620d59 | 1919 | int usb_runtime_idle(struct device *dev) |
9bbdf1e0 | 1920 | { |
63defa73 ML |
1921 | struct usb_device *udev = to_usb_device(dev); |
1922 | ||
9bbdf1e0 | 1923 | /* An idle USB device can be suspended if it passes the various |
63defa73 | 1924 | * autosuspend checks. |
9bbdf1e0 | 1925 | */ |
63defa73 | 1926 | if (autosuspend_check(udev) == 0) |
fcc4a01e | 1927 | pm_runtime_autosuspend(dev); |
45f0a85c RW |
1928 | /* Tell the core not to suspend it, though. */ |
1929 | return -EBUSY; | |
9bbdf1e0 AS |
1930 | } |
1931 | ||
7529b257 | 1932 | static int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable) |
65580b43 AX |
1933 | { |
1934 | struct usb_hcd *hcd = bus_to_hcd(udev->bus); | |
1935 | int ret = -EPERM; | |
1936 | ||
1937 | if (hcd->driver->set_usb2_hw_lpm) { | |
1938 | ret = hcd->driver->set_usb2_hw_lpm(hcd, udev, enable); | |
1939 | if (!ret) | |
1940 | udev->usb2_hw_lpm_enabled = enable; | |
1941 | } | |
1942 | ||
1943 | return ret; | |
1944 | } | |
1945 | ||
7529b257 KHF |
1946 | int usb_enable_usb2_hardware_lpm(struct usb_device *udev) |
1947 | { | |
d7a6c0ce KHF |
1948 | if (!udev->usb2_hw_lpm_capable || |
1949 | !udev->usb2_hw_lpm_allowed || | |
1950 | udev->usb2_hw_lpm_enabled) | |
1951 | return 0; | |
1952 | ||
7529b257 KHF |
1953 | return usb_set_usb2_hardware_lpm(udev, 1); |
1954 | } | |
1955 | ||
1956 | int usb_disable_usb2_hardware_lpm(struct usb_device *udev) | |
1957 | { | |
d7a6c0ce KHF |
1958 | if (!udev->usb2_hw_lpm_enabled) |
1959 | return 0; | |
1960 | ||
7529b257 KHF |
1961 | return usb_set_usb2_hardware_lpm(udev, 0); |
1962 | } | |
1963 | ||
ceb6c9c8 | 1964 | #endif /* CONFIG_PM */ |
a8e7c565 | 1965 | |
36e56a34 AS |
1966 | struct bus_type usb_bus_type = { |
1967 | .name = "usb", | |
1968 | .match = usb_device_match, | |
1969 | .uevent = usb_uevent, | |
8c97a46a | 1970 | .need_parent_lock = true, |
36e56a34 | 1971 | }; |