2 * drivers/usb/driver.c - most of the driver model stuff for usb
4 * (C) Copyright 2005 Greg Kroah-Hartman <gregkh@suse.de>
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
18 * NOTE! This is not actually a driver at all, rather this is
19 * just a collection of helper routines that implement the
20 * matching, probing, releasing, suspending and resuming for
25 #include <linux/device.h>
26 #include <linux/slab.h>
27 #include <linux/export.h>
28 #include <linux/usb.h>
29 #include <linux/usb/quirks.h>
30 #include <linux/usb/hcd.h>
38 * Adds a new dynamic USBdevice ID to this driver,
39 * and cause the driver to probe for all devices again.
41 ssize_t
usb_store_new_id(struct usb_dynids
*dynids
,
42 struct device_driver
*driver
,
43 const char *buf
, size_t count
)
45 struct usb_dynid
*dynid
;
51 fields
= sscanf(buf
, "%x %x", &idVendor
, &idProduct
);
55 dynid
= kzalloc(sizeof(*dynid
), GFP_KERNEL
);
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
;
64 spin_lock(&dynids
->lock
);
65 list_add_tail(&dynid
->node
, &dynids
->list
);
66 spin_unlock(&dynids
->lock
);
68 if (get_driver(driver
)) {
69 retval
= driver_attach(driver
);
77 EXPORT_SYMBOL_GPL(usb_store_new_id
);
79 static ssize_t
store_new_id(struct device_driver
*driver
,
80 const char *buf
, size_t count
)
82 struct usb_driver
*usb_drv
= to_usb_driver(driver
);
84 return usb_store_new_id(&usb_drv
->dynids
, driver
, buf
, count
);
86 static DRIVER_ATTR(new_id
, S_IWUSR
, NULL
, store_new_id
);
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
94 * Removes a dynamic usb device ID from this driver.
97 store_remove_id(struct device_driver
*driver
, const char *buf
, size_t count
)
99 struct usb_dynid
*dynid
, *n
;
100 struct usb_driver
*usb_driver
= to_usb_driver(driver
);
106 fields
= sscanf(buf
, "%x %x", &idVendor
, &idProduct
);
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
);
121 spin_unlock(&usb_driver
->dynids
.lock
);
127 static DRIVER_ATTR(remove_id
, S_IWUSR
, NULL
, store_remove_id
);
129 static int usb_create_newid_file(struct usb_driver
*usb_drv
)
133 if (usb_drv
->no_dynamic_id
)
136 if (usb_drv
->probe
!= NULL
)
137 error
= driver_create_file(&usb_drv
->drvwrap
.driver
,
138 &driver_attr_new_id
);
143 static void usb_remove_newid_file(struct usb_driver
*usb_drv
)
145 if (usb_drv
->no_dynamic_id
)
148 if (usb_drv
->probe
!= NULL
)
149 driver_remove_file(&usb_drv
->drvwrap
.driver
,
150 &driver_attr_new_id
);
154 usb_create_removeid_file(struct usb_driver
*drv
)
157 if (drv
->probe
!= NULL
)
158 error
= driver_create_file(&drv
->drvwrap
.driver
,
159 &driver_attr_remove_id
);
163 static void usb_remove_removeid_file(struct usb_driver
*drv
)
165 driver_remove_file(&drv
->drvwrap
.driver
, &driver_attr_remove_id
);
168 static void usb_free_dynids(struct usb_driver
*usb_drv
)
170 struct usb_dynid
*dynid
, *n
;
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
);
177 spin_unlock(&usb_drv
->dynids
.lock
);
180 static inline int usb_create_newid_file(struct usb_driver
*usb_drv
)
185 static void usb_remove_newid_file(struct usb_driver
*usb_drv
)
190 usb_create_removeid_file(struct usb_driver
*drv
)
195 static void usb_remove_removeid_file(struct usb_driver
*drv
)
199 static inline void usb_free_dynids(struct usb_driver
*usb_drv
)
204 static const struct usb_device_id
*usb_match_dynamic_id(struct usb_interface
*intf
,
205 struct usb_driver
*drv
)
207 struct usb_dynid
*dynid
;
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
);
216 spin_unlock(&drv
->dynids
.lock
);
221 /* called from driver core with dev locked */
222 static int usb_probe_device(struct device
*dev
)
224 struct usb_device_driver
*udriver
= to_usb_device_driver(dev
->driver
);
225 struct usb_device
*udev
= to_usb_device(dev
);
228 dev_dbg(dev
, "%s\n", __func__
);
230 /* TODO: Add real matching code */
232 /* The device should always appear to be in use
233 * unless the driver suports autosuspend.
235 if (!udriver
->supports_autosuspend
)
236 error
= usb_autoresume_device(udev
);
239 error
= udriver
->probe(udev
);
243 /* called from driver core with dev locked */
244 static int usb_unbind_device(struct device
*dev
)
246 struct usb_device
*udev
= to_usb_device(dev
);
247 struct usb_device_driver
*udriver
= to_usb_device_driver(dev
->driver
);
249 udriver
->disconnect(udev
);
250 if (!udriver
->supports_autosuspend
)
251 usb_autosuspend_device(udev
);
256 * Cancel any pending scheduled resets
258 * [see usb_queue_reset_device()]
260 * Called after unconfiguring / when releasing interfaces. See
261 * comments in __usb_queue_reset_device() regarding
262 * udev->reset_running.
264 static void usb_cancel_queued_reset(struct usb_interface
*iface
)
266 if (iface
->reset_running
== 0)
267 cancel_work_sync(&iface
->reset_ws
);
270 /* called from driver core with dev locked */
271 static int usb_probe_interface(struct device
*dev
)
273 struct usb_driver
*driver
= to_usb_driver(dev
->driver
);
274 struct usb_interface
*intf
= to_usb_interface(dev
);
275 struct usb_device
*udev
= interface_to_usbdev(intf
);
276 const struct usb_device_id
*id
;
279 dev_dbg(dev
, "%s\n", __func__
);
281 intf
->needs_binding
= 0;
283 if (usb_device_is_owned(udev
))
286 if (udev
->authorized
== 0) {
287 dev_err(&intf
->dev
, "Device is not authorized for usage\n");
291 id
= usb_match_id(intf
, driver
->id_table
);
293 id
= usb_match_dynamic_id(intf
, driver
);
297 dev_dbg(dev
, "%s - got id\n", __func__
);
299 error
= usb_autoresume_device(udev
);
303 intf
->condition
= USB_INTERFACE_BINDING
;
305 /* Probed interfaces are initially active. They are
306 * runtime-PM-enabled only if the driver has autosuspend support.
307 * They are sensitive to their children's power states.
309 pm_runtime_set_active(dev
);
310 pm_suspend_ignore_children(dev
, false);
311 if (driver
->supports_autosuspend
)
312 pm_runtime_enable(dev
);
314 /* 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);
320 intf
->needs_altsetting0
= 0;
323 error
= driver
->probe(intf
, id
);
327 intf
->condition
= USB_INTERFACE_BOUND
;
328 usb_autosuspend_device(udev
);
332 intf
->needs_remote_wakeup
= 0;
333 intf
->condition
= USB_INTERFACE_UNBOUND
;
334 usb_cancel_queued_reset(intf
);
336 /* Unbound interfaces are always runtime-PM-disabled and -suspended */
337 if (driver
->supports_autosuspend
)
338 pm_runtime_disable(dev
);
339 pm_runtime_set_suspended(dev
);
341 usb_autosuspend_device(udev
);
345 /* called from driver core with dev locked */
346 static int usb_unbind_interface(struct device
*dev
)
348 struct usb_driver
*driver
= to_usb_driver(dev
->driver
);
349 struct usb_interface
*intf
= to_usb_interface(dev
);
350 struct usb_device
*udev
;
353 intf
->condition
= USB_INTERFACE_UNBINDING
;
355 /* Autoresume for set_interface call below */
356 udev
= interface_to_usbdev(intf
);
357 error
= usb_autoresume_device(udev
);
359 /* Terminate all URBs for this interface unless the driver
360 * supports "soft" unbinding.
362 if (!driver
->soft_unbind
)
363 usb_disable_interface(udev
, intf
, false);
365 driver
->disconnect(intf
);
366 usb_cancel_queued_reset(intf
);
368 /* 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.
374 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.
378 usb_enable_interface(udev
, intf
, false);
379 } else if (!error
&& !intf
->dev
.power
.is_prepared
) {
380 r
= usb_set_interface(udev
, intf
->altsetting
[0].
381 desc
.bInterfaceNumber
, 0);
383 intf
->needs_altsetting0
= 1;
385 intf
->needs_altsetting0
= 1;
387 usb_set_intfdata(intf
, NULL
);
389 intf
->condition
= USB_INTERFACE_UNBOUND
;
390 intf
->needs_remote_wakeup
= 0;
392 /* Unbound interfaces are always runtime-PM-disabled and -suspended */
393 if (driver
->supports_autosuspend
)
394 pm_runtime_disable(dev
);
395 pm_runtime_set_suspended(dev
);
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);
403 usb_autosuspend_device(udev
);
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
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.
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.
424 * 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
428 int usb_driver_claim_interface(struct usb_driver
*driver
,
429 struct usb_interface
*iface
, void *priv
)
431 struct device
*dev
= &iface
->dev
;
437 dev
->driver
= &driver
->drvwrap
.driver
;
438 usb_set_intfdata(iface
, priv
);
439 iface
->needs_binding
= 0;
441 iface
->condition
= USB_INTERFACE_BOUND
;
443 /* 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.
449 pm_suspend_ignore_children(dev
, false);
450 if (driver
->supports_autosuspend
)
451 pm_runtime_enable(dev
);
453 pm_runtime_set_active(dev
);
455 /* if interface was already added, bind now; else let
456 * the future device_add() bind it, bypassing probe()
458 if (device_is_registered(dev
))
459 retval
= device_bind_driver(dev
);
463 EXPORT_SYMBOL_GPL(usb_driver_claim_interface
);
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
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.
474 * This call is synchronous, and may not be used in an interrupt context.
475 * 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
479 void usb_driver_release_interface(struct usb_driver
*driver
,
480 struct usb_interface
*iface
)
482 struct device
*dev
= &iface
->dev
;
484 /* this should never happen, don't release something that's not ours */
485 if (!dev
->driver
|| dev
->driver
!= &driver
->drvwrap
.driver
)
488 /* don't release from within disconnect() */
489 if (iface
->condition
!= USB_INTERFACE_BOUND
)
491 iface
->condition
= USB_INTERFACE_UNBINDING
;
493 /* Release via the driver core only if the interface
494 * has already been registered
496 if (device_is_registered(dev
)) {
497 device_release_driver(dev
);
500 usb_unbind_interface(dev
);
505 EXPORT_SYMBOL_GPL(usb_driver_release_interface
);
507 /* returns 0 if no match, 1 if match */
508 int usb_match_device(struct usb_device
*dev
, const struct usb_device_id
*id
)
510 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_VENDOR
) &&
511 id
->idVendor
!= le16_to_cpu(dev
->descriptor
.idVendor
))
514 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_PRODUCT
) &&
515 id
->idProduct
!= le16_to_cpu(dev
->descriptor
.idProduct
))
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
)))
524 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_HI
) &&
525 (id
->bcdDevice_hi
< le16_to_cpu(dev
->descriptor
.bcdDevice
)))
528 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_CLASS
) &&
529 (id
->bDeviceClass
!= dev
->descriptor
.bDeviceClass
))
532 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_SUBCLASS
) &&
533 (id
->bDeviceSubClass
!= dev
->descriptor
.bDeviceSubClass
))
536 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_DEV_PROTOCOL
) &&
537 (id
->bDeviceProtocol
!= dev
->descriptor
.bDeviceProtocol
))
543 /* returns 0 if no match, 1 if match */
544 int usb_match_one_id(struct usb_interface
*interface
,
545 const struct usb_device_id
*id
)
547 struct usb_host_interface
*intf
;
548 struct usb_device
*dev
;
550 /* proc_connectinfo in devio.c may call us with id == NULL. */
554 intf
= interface
->cur_altsetting
;
555 dev
= interface_to_usbdev(interface
);
557 if (!usb_match_device(dev
, id
))
560 /* 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
)))
570 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_CLASS
) &&
571 (id
->bInterfaceClass
!= intf
->desc
.bInterfaceClass
))
574 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_SUBCLASS
) &&
575 (id
->bInterfaceSubClass
!= intf
->desc
.bInterfaceSubClass
))
578 if ((id
->match_flags
& USB_DEVICE_ID_MATCH_INT_PROTOCOL
) &&
579 (id
->bInterfaceProtocol
!= intf
->desc
.bInterfaceProtocol
))
584 EXPORT_SYMBOL_GPL(usb_match_one_id
);
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
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.
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
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.
614 * What Makes Good usb_device_id Tables:
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.
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.
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
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
640 * devices (as recorded in bInterfaceClass).
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.)
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.
657 const struct usb_device_id
*usb_match_id(struct usb_interface
*interface
,
658 const struct usb_device_id
*id
)
660 /* proc_connectinfo in devio.c may call us with id == NULL. */
664 /* 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. */
669 for (; id
->idVendor
|| id
->idProduct
|| id
->bDeviceClass
||
670 id
->bInterfaceClass
|| id
->driver_info
; id
++) {
671 if (usb_match_one_id(interface
, id
))
677 EXPORT_SYMBOL_GPL(usb_match_id
);
679 static int usb_device_match(struct device
*dev
, struct device_driver
*drv
)
681 /* devices and interfaces are handled separately */
682 if (is_usb_device(dev
)) {
684 /* interface drivers never match devices */
685 if (!is_usb_device_driver(drv
))
688 /* TODO: Add real matching code */
691 } else if (is_usb_interface(dev
)) {
692 struct usb_interface
*intf
;
693 struct usb_driver
*usb_drv
;
694 const struct usb_device_id
*id
;
696 /* device drivers never match interfaces */
697 if (is_usb_device_driver(drv
))
700 intf
= to_usb_interface(dev
);
701 usb_drv
= to_usb_driver(drv
);
703 id
= usb_match_id(intf
, usb_drv
->id_table
);
707 id
= usb_match_dynamic_id(intf
, usb_drv
);
715 #ifdef CONFIG_HOTPLUG
716 static int usb_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
718 struct usb_device
*usb_dev
;
720 if (is_usb_device(dev
)) {
721 usb_dev
= to_usb_device(dev
);
722 } else if (is_usb_interface(dev
)) {
723 struct usb_interface
*intf
= to_usb_interface(dev
);
725 usb_dev
= interface_to_usbdev(intf
);
730 if (usb_dev
->devnum
< 0) {
731 /* driver is often null here; dev_dbg() would oops */
732 pr_debug("usb %s: already deleted?\n", dev_name(dev
));
736 pr_debug("usb %s: bus removed?\n", dev_name(dev
));
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
743 * act as usermode drivers.
745 if (add_uevent_var(env
, "DEVICE=/proc/bus/usb/%03d/%03d",
746 usb_dev
->bus
->busnum
, usb_dev
->devnum
))
750 /* per-device configurations are common */
751 if (add_uevent_var(env
, "PRODUCT=%x/%x/%x",
752 le16_to_cpu(usb_dev
->descriptor
.idVendor
),
753 le16_to_cpu(usb_dev
->descriptor
.idProduct
),
754 le16_to_cpu(usb_dev
->descriptor
.bcdDevice
)))
757 /* class-based driver binding models */
758 if (add_uevent_var(env
, "TYPE=%d/%d/%d",
759 usb_dev
->descriptor
.bDeviceClass
,
760 usb_dev
->descriptor
.bDeviceSubClass
,
761 usb_dev
->descriptor
.bDeviceProtocol
))
769 static int usb_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
773 #endif /* CONFIG_HOTPLUG */
776 * usb_register_device_driver - register a USB device (not interface) driver
777 * @new_udriver: USB operations for the device driver
778 * @owner: module owner of this driver.
780 * 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.
785 int usb_register_device_driver(struct usb_device_driver
*new_udriver
,
786 struct module
*owner
)
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
;
800 retval
= driver_register(&new_udriver
->drvwrap
.driver
);
803 pr_info("%s: registered new device driver %s\n",
804 usbcore_name
, new_udriver
->name
);
805 usbfs_update_special();
807 printk(KERN_ERR
"%s: error %d registering device "
809 usbcore_name
, retval
, new_udriver
->name
);
814 EXPORT_SYMBOL_GPL(usb_register_device_driver
);
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
821 * Unlinks the specified driver from the internal USB driver list.
823 void usb_deregister_device_driver(struct usb_device_driver
*udriver
)
825 pr_info("%s: deregistering device driver %s\n",
826 usbcore_name
, udriver
->name
);
828 driver_unregister(&udriver
->drvwrap
.driver
);
829 usbfs_update_special();
831 EXPORT_SYMBOL_GPL(usb_deregister_device_driver
);
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.
837 * @mod_name: module name string
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.
842 * Returns a negative error code on failure and 0 on success.
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.
848 int usb_register_driver(struct usb_driver
*new_driver
, struct module
*owner
,
849 const char *mod_name
)
856 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
;
862 new_driver
->drvwrap
.driver
.mod_name
= mod_name
;
863 spin_lock_init(&new_driver
->dynids
.lock
);
864 INIT_LIST_HEAD(&new_driver
->dynids
.list
);
866 retval
= driver_register(&new_driver
->drvwrap
.driver
);
870 usbfs_update_special();
872 retval
= usb_create_newid_file(new_driver
);
876 retval
= usb_create_removeid_file(new_driver
);
880 pr_info("%s: registered new interface driver %s\n",
881 usbcore_name
, new_driver
->name
);
887 usb_remove_newid_file(new_driver
);
889 driver_unregister(&new_driver
->drvwrap
.driver
);
891 printk(KERN_ERR
"%s: error %d registering interface "
893 usbcore_name
, retval
, new_driver
->name
);
896 EXPORT_SYMBOL_GPL(usb_register_driver
);
899 * usb_deregister - unregister a USB interface driver
900 * @driver: USB operations of the interface driver to unregister
901 * Context: must be able to sleep
903 * Unlinks the specified driver from the internal USB driver list.
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.
909 void usb_deregister(struct usb_driver
*driver
)
911 pr_info("%s: deregistering interface driver %s\n",
912 usbcore_name
, driver
->name
);
914 usb_remove_removeid_file(driver
);
915 usb_remove_newid_file(driver
);
916 usb_free_dynids(driver
);
917 driver_unregister(&driver
->drvwrap
.driver
);
919 usbfs_update_special();
921 EXPORT_SYMBOL_GPL(usb_deregister
);
923 /* 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.
927 * The caller must hold @intf's device's lock, but not its pm_mutex
928 * and not @intf->dev.sem.
930 void usb_forced_unbind_intf(struct usb_interface
*intf
)
932 struct usb_driver
*driver
= to_usb_driver(intf
->dev
.driver
);
934 dev_dbg(&intf
->dev
, "forced unbind\n");
935 usb_driver_release_interface(driver
, intf
);
937 /* Mark the interface for later rebinding */
938 intf
->needs_binding
= 1;
941 /* Delayed forced unbinding of a USB interface driver and scan
944 * The caller must hold @intf's device's lock, but not its pm_mutex
945 * and not @intf->dev.sem.
947 * Note: Rebinds will be skipped if a system sleep transition is in
948 * progress and the PM "complete" callback hasn't occurred yet.
950 void usb_rebind_intf(struct usb_interface
*intf
)
954 /* Delayed unbind of an existing driver */
955 if (intf
->dev
.driver
) {
956 struct usb_driver
*driver
=
957 to_usb_driver(intf
->dev
.driver
);
959 dev_dbg(&intf
->dev
, "forced unbind\n");
960 usb_driver_release_interface(driver
, intf
);
963 /* Try to rebind the interface */
964 if (!intf
->dev
.power
.is_prepared
) {
965 intf
->needs_binding
= 0;
966 rc
= device_attach(&intf
->dev
);
968 dev_warn(&intf
->dev
, "rebind failed: %d\n", rc
);
977 /* Unbind drivers for @udev's interfaces that don't support suspend/resume,
978 * or rebind interfaces that have been unbound, according to @action.
980 * The caller must hold @udev's device lock.
982 static void do_unbind_rebind(struct usb_device
*udev
, int action
)
984 struct usb_host_config
*config
;
986 struct usb_interface
*intf
;
987 struct usb_driver
*drv
;
989 config
= udev
->actconfig
;
991 for (i
= 0; i
< config
->desc
.bNumInterfaces
; ++i
) {
992 intf
= config
->interface
[i
];
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
);
1002 if (intf
->needs_binding
)
1003 usb_rebind_intf(intf
);
1010 static int usb_suspend_device(struct usb_device
*udev
, pm_message_t msg
)
1012 struct usb_device_driver
*udriver
;
1015 if (udev
->state
== USB_STATE_NOTATTACHED
||
1016 udev
->state
== USB_STATE_SUSPENDED
)
1019 /* 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
);
1023 udev
->do_remote_wakeup
= 0;
1024 udriver
= &usb_generic_driver
;
1026 status
= udriver
->suspend(udev
, msg
);
1029 dev_vdbg(&udev
->dev
, "%s: status %d\n", __func__
, status
);
1033 static int usb_resume_device(struct usb_device
*udev
, pm_message_t msg
)
1035 struct usb_device_driver
*udriver
;
1038 if (udev
->state
== USB_STATE_NOTATTACHED
)
1041 /* Can't resume it if it doesn't have a driver. */
1042 if (udev
->dev
.driver
== NULL
) {
1047 /* 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.
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
);
1055 if (udev
->quirks
& USB_QUIRK_RESET_RESUME
)
1056 udev
->reset_resume
= 1;
1058 udriver
= to_usb_device_driver(udev
->dev
.driver
);
1059 status
= udriver
->resume(udev
, msg
);
1062 dev_vdbg(&udev
->dev
, "%s: status %d\n", __func__
, status
);
1066 static int usb_suspend_interface(struct usb_device
*udev
,
1067 struct usb_interface
*intf
, pm_message_t msg
)
1069 struct usb_driver
*driver
;
1072 if (udev
->state
== USB_STATE_NOTATTACHED
||
1073 intf
->condition
== USB_INTERFACE_UNBOUND
)
1075 driver
= to_usb_driver(intf
->dev
.driver
);
1077 if (driver
->suspend
) {
1078 status
= driver
->suspend(intf
, msg
);
1079 if (status
&& !(msg
.event
& PM_EVENT_AUTO
))
1080 dev_err(&intf
->dev
, "%s error %d\n",
1083 /* 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
);
1090 dev_vdbg(&intf
->dev
, "%s: status %d\n", __func__
, status
);
1094 static int usb_resume_interface(struct usb_device
*udev
,
1095 struct usb_interface
*intf
, pm_message_t msg
, int reset_resume
)
1097 struct usb_driver
*driver
;
1100 if (udev
->state
== USB_STATE_NOTATTACHED
)
1103 /* Don't let autoresume interfere with unbinding */
1104 if (intf
->condition
== USB_INTERFACE_UNBINDING
)
1107 /* Can't resume it if it doesn't have a driver. */
1108 if (intf
->condition
== USB_INTERFACE_UNBOUND
) {
1110 /* Carry out a deferred switch to altsetting 0 */
1111 if (intf
->needs_altsetting0
&& !intf
->dev
.power
.is_prepared
) {
1112 usb_set_interface(udev
, intf
->altsetting
[0].
1113 desc
.bInterfaceNumber
, 0);
1114 intf
->needs_altsetting0
= 0;
1119 /* Don't resume if the interface is marked for rebinding */
1120 if (intf
->needs_binding
)
1122 driver
= to_usb_driver(intf
->dev
.driver
);
1125 if (driver
->reset_resume
) {
1126 status
= driver
->reset_resume(intf
);
1128 dev_err(&intf
->dev
, "%s error %d\n",
1129 "reset_resume", status
);
1131 intf
->needs_binding
= 1;
1132 dev_warn(&intf
->dev
, "no %s for driver %s?\n",
1133 "reset_resume", driver
->name
);
1136 if (driver
->resume
) {
1137 status
= driver
->resume(intf
);
1139 dev_err(&intf
->dev
, "%s error %d\n",
1142 intf
->needs_binding
= 1;
1143 dev_warn(&intf
->dev
, "no %s for driver %s?\n",
1144 "resume", driver
->name
);
1149 dev_vdbg(&intf
->dev
, "%s: status %d\n", __func__
, status
);
1151 /* Later we will unbind the driver and/or reprobe, if necessary */
1156 * usb_suspend_both - suspend a USB device and its interfaces
1157 * @udev: the usb_device to suspend
1158 * @msg: Power Management message describing this state transition
1160 * This is the central routine for suspending USB devices. It calls the
1161 * suspend methods for all the interface drivers in @udev and then calls
1162 * the suspend method for @udev itself. If an error occurs at any stage,
1163 * all the interfaces which were suspended are resumed so that they remain
1164 * in the same state as the device.
1166 * Autosuspend requests originating from a child device or an interface
1167 * driver may be made without the protection of @udev's device lock, but
1168 * all other suspend calls will hold the lock. Usbcore will insure that
1169 * method calls do not arrive during bind, unbind, or reset operations.
1170 * However drivers must be prepared to handle suspend calls arriving at
1171 * unpredictable times.
1173 * This routine can run only in process context.
1175 static int usb_suspend_both(struct usb_device
*udev
, pm_message_t msg
)
1179 struct usb_interface
*intf
;
1181 if (udev
->state
== USB_STATE_NOTATTACHED
||
1182 udev
->state
== USB_STATE_SUSPENDED
)
1185 /* Suspend all the interfaces and then udev itself */
1186 if (udev
->actconfig
) {
1187 n
= udev
->actconfig
->desc
.bNumInterfaces
;
1188 for (i
= n
- 1; i
>= 0; --i
) {
1189 intf
= udev
->actconfig
->interface
[i
];
1190 status
= usb_suspend_interface(udev
, intf
, msg
);
1192 /* Ignore errors during system sleep transitions */
1193 if (!(msg
.event
& PM_EVENT_AUTO
))
1200 status
= usb_suspend_device(udev
, msg
);
1202 /* Again, ignore errors during system sleep transitions */
1203 if (!(msg
.event
& PM_EVENT_AUTO
))
1207 /* If the suspend failed, resume interfaces that did get suspended */
1209 msg
.event
^= (PM_EVENT_SUSPEND
| PM_EVENT_RESUME
);
1211 intf
= udev
->actconfig
->interface
[i
];
1212 usb_resume_interface(udev
, intf
, msg
, 0);
1215 /* If the suspend succeeded then prevent any more URB submissions
1216 * and flush any outstanding URBs.
1219 udev
->can_submit
= 0;
1220 for (i
= 0; i
< 16; ++i
) {
1221 usb_hcd_flush_endpoint(udev
, udev
->ep_out
[i
]);
1222 usb_hcd_flush_endpoint(udev
, udev
->ep_in
[i
]);
1227 dev_vdbg(&udev
->dev
, "%s: status %d\n", __func__
, status
);
1232 * usb_resume_both - resume a USB device and its interfaces
1233 * @udev: the usb_device to resume
1234 * @msg: Power Management message describing this state transition
1236 * This is the central routine for resuming USB devices. It calls the
1237 * the resume method for @udev and then calls the resume methods for all
1238 * the interface drivers in @udev.
1240 * Autoresume requests originating from a child device or an interface
1241 * driver may be made without the protection of @udev's device lock, but
1242 * all other resume calls will hold the lock. Usbcore will insure that
1243 * method calls do not arrive during bind, unbind, or reset operations.
1244 * However drivers must be prepared to handle resume calls arriving at
1245 * unpredictable times.
1247 * This routine can run only in process context.
1249 static int usb_resume_both(struct usb_device
*udev
, pm_message_t msg
)
1253 struct usb_interface
*intf
;
1255 if (udev
->state
== USB_STATE_NOTATTACHED
) {
1259 udev
->can_submit
= 1;
1261 /* Resume the device */
1262 if (udev
->state
== USB_STATE_SUSPENDED
|| udev
->reset_resume
)
1263 status
= usb_resume_device(udev
, msg
);
1265 /* Resume the interfaces */
1266 if (status
== 0 && udev
->actconfig
) {
1267 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1268 intf
= udev
->actconfig
->interface
[i
];
1269 usb_resume_interface(udev
, intf
, msg
,
1270 udev
->reset_resume
);
1273 usb_mark_last_busy(udev
);
1276 dev_vdbg(&udev
->dev
, "%s: status %d\n", __func__
, status
);
1278 udev
->reset_resume
= 0;
1282 static void choose_wakeup(struct usb_device
*udev
, pm_message_t msg
)
1286 /* Remote wakeup is needed only when we actually go to sleep.
1287 * For things like FREEZE and QUIESCE, if the device is already
1288 * autosuspended then its current wakeup setting is okay.
1290 if (msg
.event
== PM_EVENT_FREEZE
|| msg
.event
== PM_EVENT_QUIESCE
) {
1291 if (udev
->state
!= USB_STATE_SUSPENDED
)
1292 udev
->do_remote_wakeup
= 0;
1296 /* Enable remote wakeup if it is allowed, even if no interface drivers
1299 w
= device_may_wakeup(&udev
->dev
);
1301 /* If the device is autosuspended with the wrong wakeup setting,
1302 * autoresume now so the setting can be changed.
1304 if (udev
->state
== USB_STATE_SUSPENDED
&& w
!= udev
->do_remote_wakeup
)
1305 pm_runtime_resume(&udev
->dev
);
1306 udev
->do_remote_wakeup
= w
;
1309 /* The device lock is held by the PM core */
1310 int usb_suspend(struct device
*dev
, pm_message_t msg
)
1312 struct usb_device
*udev
= to_usb_device(dev
);
1314 do_unbind_rebind(udev
, DO_UNBIND
);
1315 choose_wakeup(udev
, msg
);
1316 return usb_suspend_both(udev
, msg
);
1319 /* The device lock is held by the PM core */
1320 int usb_resume(struct device
*dev
, pm_message_t msg
)
1322 struct usb_device
*udev
= to_usb_device(dev
);
1325 /* For PM complete calls, all we do is rebind interfaces */
1326 if (msg
.event
== PM_EVENT_ON
) {
1327 if (udev
->state
!= USB_STATE_NOTATTACHED
)
1328 do_unbind_rebind(udev
, DO_REBIND
);
1331 /* For all other calls, take the device back to full power and
1332 * tell the PM core in case it was autosuspended previously.
1333 * Unbind the interfaces that will need rebinding later.
1336 status
= usb_resume_both(udev
, msg
);
1338 pm_runtime_disable(dev
);
1339 pm_runtime_set_active(dev
);
1340 pm_runtime_enable(dev
);
1341 do_unbind_rebind(udev
, DO_REBIND
);
1345 /* Avoid PM error messages for devices disconnected while suspended
1346 * as we'll display regular disconnect messages just a bit later.
1348 if (status
== -ENODEV
|| status
== -ESHUTDOWN
)
1353 #endif /* CONFIG_PM */
1355 #ifdef CONFIG_USB_SUSPEND
1358 * usb_enable_autosuspend - allow a USB device to be autosuspended
1359 * @udev: the USB device which may be autosuspended
1361 * This routine allows @udev to be autosuspended. An autosuspend won't
1362 * take place until the autosuspend_delay has elapsed and all the other
1363 * necessary conditions are satisfied.
1365 * The caller must hold @udev's device lock.
1367 void usb_enable_autosuspend(struct usb_device
*udev
)
1369 pm_runtime_allow(&udev
->dev
);
1371 EXPORT_SYMBOL_GPL(usb_enable_autosuspend
);
1374 * usb_disable_autosuspend - prevent a USB device from being autosuspended
1375 * @udev: the USB device which may not be autosuspended
1377 * This routine prevents @udev from being autosuspended and wakes it up
1378 * if it is already autosuspended.
1380 * The caller must hold @udev's device lock.
1382 void usb_disable_autosuspend(struct usb_device
*udev
)
1384 pm_runtime_forbid(&udev
->dev
);
1386 EXPORT_SYMBOL_GPL(usb_disable_autosuspend
);
1389 * usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces
1390 * @udev: the usb_device to autosuspend
1392 * This routine should be called when a core subsystem is finished using
1393 * @udev and wants to allow it to autosuspend. Examples would be when
1394 * @udev's device file in usbfs is closed or after a configuration change.
1396 * @udev's usage counter is decremented; if it drops to 0 and all the
1397 * interfaces are inactive then a delayed autosuspend will be attempted.
1398 * The attempt may fail (see autosuspend_check()).
1400 * The caller must hold @udev's device lock.
1402 * This routine can run only in process context.
1404 void usb_autosuspend_device(struct usb_device
*udev
)
1408 usb_mark_last_busy(udev
);
1409 status
= pm_runtime_put_sync_autosuspend(&udev
->dev
);
1410 dev_vdbg(&udev
->dev
, "%s: cnt %d -> %d\n",
1411 __func__
, atomic_read(&udev
->dev
.power
.usage_count
),
1416 * usb_autoresume_device - immediately autoresume a USB device and its interfaces
1417 * @udev: the usb_device to autoresume
1419 * This routine should be called when a core subsystem wants to use @udev
1420 * and needs to guarantee that it is not suspended. No autosuspend will
1421 * occur until usb_autosuspend_device() is called. (Note that this will
1422 * not prevent suspend events originating in the PM core.) Examples would
1423 * be when @udev's device file in usbfs is opened or when a remote-wakeup
1424 * request is received.
1426 * @udev's usage counter is incremented to prevent subsequent autosuspends.
1427 * However if the autoresume fails then the usage counter is re-decremented.
1429 * The caller must hold @udev's device lock.
1431 * This routine can run only in process context.
1433 int usb_autoresume_device(struct usb_device
*udev
)
1437 status
= pm_runtime_get_sync(&udev
->dev
);
1439 pm_runtime_put_sync(&udev
->dev
);
1440 dev_vdbg(&udev
->dev
, "%s: cnt %d -> %d\n",
1441 __func__
, atomic_read(&udev
->dev
.power
.usage_count
),
1449 * usb_autopm_put_interface - decrement a USB interface's PM-usage counter
1450 * @intf: the usb_interface whose counter should be decremented
1452 * This routine should be called by an interface driver when it is
1453 * finished using @intf and wants to allow it to autosuspend. A typical
1454 * example would be a character-device driver when its device file is
1457 * The routine decrements @intf's usage counter. When the counter reaches
1458 * 0, a delayed autosuspend request for @intf's device is attempted. The
1459 * attempt may fail (see autosuspend_check()).
1461 * This routine can run only in process context.
1463 void usb_autopm_put_interface(struct usb_interface
*intf
)
1465 struct usb_device
*udev
= interface_to_usbdev(intf
);
1468 usb_mark_last_busy(udev
);
1469 atomic_dec(&intf
->pm_usage_cnt
);
1470 status
= pm_runtime_put_sync(&intf
->dev
);
1471 dev_vdbg(&intf
->dev
, "%s: cnt %d -> %d\n",
1472 __func__
, atomic_read(&intf
->dev
.power
.usage_count
),
1475 EXPORT_SYMBOL_GPL(usb_autopm_put_interface
);
1478 * usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter
1479 * @intf: the usb_interface whose counter should be decremented
1481 * This routine does much the same thing as usb_autopm_put_interface():
1482 * It decrements @intf's usage counter and schedules a delayed
1483 * autosuspend request if the counter is <= 0. The difference is that it
1484 * does not perform any synchronization; callers should hold a private
1485 * lock and handle all synchronization issues themselves.
1487 * Typically a driver would call this routine during an URB's completion
1488 * handler, if no more URBs were pending.
1490 * This routine can run in atomic context.
1492 void usb_autopm_put_interface_async(struct usb_interface
*intf
)
1494 struct usb_device
*udev
= interface_to_usbdev(intf
);
1497 usb_mark_last_busy(udev
);
1498 atomic_dec(&intf
->pm_usage_cnt
);
1499 status
= pm_runtime_put(&intf
->dev
);
1500 dev_vdbg(&intf
->dev
, "%s: cnt %d -> %d\n",
1501 __func__
, atomic_read(&intf
->dev
.power
.usage_count
),
1504 EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async
);
1507 * usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter
1508 * @intf: the usb_interface whose counter should be decremented
1510 * This routine decrements @intf's usage counter but does not carry out an
1513 * This routine can run in atomic context.
1515 void usb_autopm_put_interface_no_suspend(struct usb_interface
*intf
)
1517 struct usb_device
*udev
= interface_to_usbdev(intf
);
1519 usb_mark_last_busy(udev
);
1520 atomic_dec(&intf
->pm_usage_cnt
);
1521 pm_runtime_put_noidle(&intf
->dev
);
1523 EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend
);
1526 * usb_autopm_get_interface - increment a USB interface's PM-usage counter
1527 * @intf: the usb_interface whose counter should be incremented
1529 * This routine should be called by an interface driver when it wants to
1530 * use @intf and needs to guarantee that it is not suspended. In addition,
1531 * the routine prevents @intf from being autosuspended subsequently. (Note
1532 * that this will not prevent suspend events originating in the PM core.)
1533 * This prevention will persist until usb_autopm_put_interface() is called
1534 * or @intf is unbound. A typical example would be a character-device
1535 * driver when its device file is opened.
1537 * @intf's usage counter is incremented to prevent subsequent autosuspends.
1538 * However if the autoresume fails then the counter is re-decremented.
1540 * This routine can run only in process context.
1542 int usb_autopm_get_interface(struct usb_interface
*intf
)
1546 status
= pm_runtime_get_sync(&intf
->dev
);
1548 pm_runtime_put_sync(&intf
->dev
);
1550 atomic_inc(&intf
->pm_usage_cnt
);
1551 dev_vdbg(&intf
->dev
, "%s: cnt %d -> %d\n",
1552 __func__
, atomic_read(&intf
->dev
.power
.usage_count
),
1558 EXPORT_SYMBOL_GPL(usb_autopm_get_interface
);
1561 * usb_autopm_get_interface_async - increment a USB interface's PM-usage counter
1562 * @intf: the usb_interface whose counter should be incremented
1564 * This routine does much the same thing as
1565 * usb_autopm_get_interface(): It increments @intf's usage counter and
1566 * queues an autoresume request if the device is suspended. The
1567 * differences are that it does not perform any synchronization (callers
1568 * should hold a private lock and handle all synchronization issues
1569 * themselves), and it does not autoresume the device directly (it only
1570 * queues a request). After a successful call, the device may not yet be
1573 * This routine can run in atomic context.
1575 int usb_autopm_get_interface_async(struct usb_interface
*intf
)
1579 status
= pm_runtime_get(&intf
->dev
);
1580 if (status
< 0 && status
!= -EINPROGRESS
)
1581 pm_runtime_put_noidle(&intf
->dev
);
1583 atomic_inc(&intf
->pm_usage_cnt
);
1584 dev_vdbg(&intf
->dev
, "%s: cnt %d -> %d\n",
1585 __func__
, atomic_read(&intf
->dev
.power
.usage_count
),
1591 EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async
);
1594 * usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter
1595 * @intf: the usb_interface whose counter should be incremented
1597 * This routine increments @intf's usage counter but does not carry out an
1600 * This routine can run in atomic context.
1602 void usb_autopm_get_interface_no_resume(struct usb_interface
*intf
)
1604 struct usb_device
*udev
= interface_to_usbdev(intf
);
1606 usb_mark_last_busy(udev
);
1607 atomic_inc(&intf
->pm_usage_cnt
);
1608 pm_runtime_get_noresume(&intf
->dev
);
1610 EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume
);
1612 /* Internal routine to check whether we may autosuspend a device. */
1613 static int autosuspend_check(struct usb_device
*udev
)
1616 struct usb_interface
*intf
;
1618 /* Fail if autosuspend is disabled, or any interfaces are in use, or
1619 * any interface drivers require remote wakeup but it isn't available.
1622 if (udev
->actconfig
) {
1623 for (i
= 0; i
< udev
->actconfig
->desc
.bNumInterfaces
; i
++) {
1624 intf
= udev
->actconfig
->interface
[i
];
1626 /* We don't need to check interfaces that are
1627 * disabled for runtime PM. Either they are unbound
1628 * or else their drivers don't support autosuspend
1629 * and so they are permanently active.
1631 if (intf
->dev
.power
.disable_depth
)
1633 if (atomic_read(&intf
->dev
.power
.usage_count
) > 0)
1635 w
|= intf
->needs_remote_wakeup
;
1637 /* Don't allow autosuspend if the device will need
1638 * a reset-resume and any of its interface drivers
1639 * doesn't include support or needs remote wakeup.
1641 if (udev
->quirks
& USB_QUIRK_RESET_RESUME
) {
1642 struct usb_driver
*driver
;
1644 driver
= to_usb_driver(intf
->dev
.driver
);
1645 if (!driver
->reset_resume
||
1646 intf
->needs_remote_wakeup
)
1651 if (w
&& !device_can_wakeup(&udev
->dev
)) {
1652 dev_dbg(&udev
->dev
, "remote wakeup needed for autosuspend\n");
1655 udev
->do_remote_wakeup
= w
;
1659 int usb_runtime_suspend(struct device
*dev
)
1661 struct usb_device
*udev
= to_usb_device(dev
);
1664 /* A USB device can be suspended if it passes the various autosuspend
1665 * checks. Runtime suspend for a USB device means suspending all the
1666 * interfaces and then the device itself.
1668 if (autosuspend_check(udev
) != 0)
1671 status
= usb_suspend_both(udev
, PMSG_AUTO_SUSPEND
);
1672 /* The PM core reacts badly unless the return code is 0,
1673 * -EAGAIN, or -EBUSY, so always return -EBUSY on an error.
1680 int usb_runtime_resume(struct device
*dev
)
1682 struct usb_device
*udev
= to_usb_device(dev
);
1685 /* Runtime resume for a USB device means resuming both the device
1686 * and all its interfaces.
1688 status
= usb_resume_both(udev
, PMSG_AUTO_RESUME
);
1692 int usb_runtime_idle(struct device
*dev
)
1694 struct usb_device
*udev
= to_usb_device(dev
);
1696 /* An idle USB device can be suspended if it passes the various
1697 * autosuspend checks.
1699 if (autosuspend_check(udev
) == 0)
1700 pm_runtime_autosuspend(dev
);
1704 #endif /* CONFIG_USB_SUSPEND */
1706 struct bus_type usb_bus_type
= {
1708 .match
= usb_device_match
,
1709 .uevent
= usb_uevent
,