2 * drivers/acpi/device_pm.c - ACPI device power management routines.
4 * Copyright (C) 2012, Intel Corp.
5 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #include <linux/device.h>
26 #include <linux/export.h>
27 #include <linux/mutex.h>
28 #include <linux/pm_qos.h>
29 #include <linux/pm_runtime.h>
31 #include <acpi/acpi.h>
32 #include <acpi/acpi_bus.h>
33 #include <acpi/acpi_drivers.h>
37 #define _COMPONENT ACPI_POWER_COMPONENT
38 ACPI_MODULE_NAME("device_pm");
41 * acpi_power_state_string - String representation of ACPI device power state.
42 * @state: ACPI device power state to return the string representation of.
44 const char *acpi_power_state_string(int state
)
53 case ACPI_STATE_D3_HOT
:
55 case ACPI_STATE_D3_COLD
:
63 * acpi_device_get_power - Get power state of an ACPI device.
64 * @device: Device to get the power state of.
65 * @state: Place to store the power state of the device.
67 * This function does not update the device's power.state field, but it may
68 * update its parent's power.state field (when the parent's power state is
69 * unknown and the device's power state turns out to be D0).
71 int acpi_device_get_power(struct acpi_device
*device
, int *state
)
73 int result
= ACPI_STATE_UNKNOWN
;
75 if (!device
|| !state
)
78 if (!device
->flags
.power_manageable
) {
79 /* TBD: Non-recursive algorithm for walking up hierarchy. */
80 *state
= device
->parent
?
81 device
->parent
->power
.state
: ACPI_STATE_D0
;
86 * Get the device's power state from power resources settings and _PSC,
89 if (device
->power
.flags
.power_resources
) {
90 int error
= acpi_power_get_inferred_state(device
, &result
);
94 if (device
->power
.flags
.explicit_get
) {
95 acpi_handle handle
= device
->handle
;
96 unsigned long long psc
;
99 status
= acpi_evaluate_integer(handle
, "_PSC", NULL
, &psc
);
100 if (ACPI_FAILURE(status
))
104 * The power resources settings may indicate a power state
105 * shallower than the actual power state of the device.
107 * Moreover, on systems predating ACPI 4.0, if the device
108 * doesn't depend on any power resources and _PSC returns 3,
109 * that means "power off". We need to maintain compatibility
110 * with those systems.
112 if (psc
> result
&& psc
< ACPI_STATE_D3_COLD
)
114 else if (result
== ACPI_STATE_UNKNOWN
)
115 result
= psc
> ACPI_STATE_D2
? ACPI_STATE_D3_COLD
: psc
;
119 * If we were unsure about the device parent's power state up to this
120 * point, the fact that the device is in D0 implies that the parent has
121 * to be in D0 too, except if ignore_parent is set.
123 if (!device
->power
.flags
.ignore_parent
&& device
->parent
124 && device
->parent
->power
.state
== ACPI_STATE_UNKNOWN
125 && result
== ACPI_STATE_D0
)
126 device
->parent
->power
.state
= ACPI_STATE_D0
;
131 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is %s\n",
132 device
->pnp
.bus_id
, acpi_power_state_string(*state
)));
137 static int acpi_dev_pm_explicit_set(struct acpi_device
*adev
, int state
)
139 if (adev
->power
.states
[state
].flags
.explicit_set
) {
140 char method
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
143 status
= acpi_evaluate_object(adev
->handle
, method
, NULL
, NULL
);
144 if (ACPI_FAILURE(status
))
151 * acpi_device_set_power - Set power state of an ACPI device.
152 * @device: Device to set the power state of.
153 * @state: New power state to set.
155 * Callers must ensure that the device is power manageable before using this
158 int acpi_device_set_power(struct acpi_device
*device
, int state
)
161 bool cut_power
= false;
163 if (!device
|| !device
->flags
.power_manageable
164 || (state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3_COLD
))
167 /* Make sure this is a valid target state */
169 if (state
== device
->power
.state
) {
170 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] already in %s\n",
172 acpi_power_state_string(state
)));
176 if (!device
->power
.states
[state
].flags
.valid
) {
177 dev_warn(&device
->dev
, "Power state %s not supported\n",
178 acpi_power_state_string(state
));
181 if (!device
->power
.flags
.ignore_parent
&&
182 device
->parent
&& (state
< device
->parent
->power
.state
)) {
183 dev_warn(&device
->dev
,
184 "Cannot transition to power state %s for parent in %s\n",
185 acpi_power_state_string(state
),
186 acpi_power_state_string(device
->parent
->power
.state
));
190 /* For D3cold we should first transition into D3hot. */
191 if (state
== ACPI_STATE_D3_COLD
192 && device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
) {
193 state
= ACPI_STATE_D3_HOT
;
197 if (state
< device
->power
.state
&& state
!= ACPI_STATE_D0
198 && device
->power
.state
>= ACPI_STATE_D3_HOT
) {
199 dev_warn(&device
->dev
,
200 "Cannot transition to non-D0 state from D3\n");
207 * In accordance with the ACPI specification first apply power (via
208 * power resources) and then evalute _PSx.
210 if (device
->power
.flags
.power_resources
) {
211 result
= acpi_power_transition(device
, state
);
215 result
= acpi_dev_pm_explicit_set(device
, state
);
220 device
->power
.state
= state
;
221 state
= ACPI_STATE_D3_COLD
;
222 result
= acpi_power_transition(device
, state
);
227 dev_warn(&device
->dev
, "Failed to change power state to %s\n",
228 acpi_power_state_string(state
));
230 device
->power
.state
= state
;
231 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
232 "Device [%s] transitioned to %s\n",
234 acpi_power_state_string(state
)));
239 EXPORT_SYMBOL(acpi_device_set_power
);
241 int acpi_bus_set_power(acpi_handle handle
, int state
)
243 struct acpi_device
*device
;
246 result
= acpi_bus_get_device(handle
, &device
);
250 return acpi_device_set_power(device
, state
);
252 EXPORT_SYMBOL(acpi_bus_set_power
);
254 int acpi_bus_init_power(struct acpi_device
*device
)
262 device
->power
.state
= ACPI_STATE_UNKNOWN
;
264 result
= acpi_device_get_power(device
, &state
);
268 if (state
< ACPI_STATE_D3_COLD
&& device
->power
.flags
.power_resources
) {
269 result
= acpi_power_on_resources(device
, state
);
273 result
= acpi_dev_pm_explicit_set(device
, state
);
276 } else if (state
== ACPI_STATE_UNKNOWN
) {
278 * No power resources and missing _PSC? Cross fingers and make
279 * it D0 in hope that this is what the BIOS put the device into.
280 * [We tried to force D0 here by executing _PS0, but that broke
281 * Toshiba P870-303 in a nasty way.]
283 state
= ACPI_STATE_D0
;
285 device
->power
.state
= state
;
290 * acpi_device_fix_up_power - Force device with missing _PSC into D0.
291 * @device: Device object whose power state is to be fixed up.
293 * Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
294 * are assumed to be put into D0 by the BIOS. However, in some cases that may
295 * not be the case and this function should be used then.
297 int acpi_device_fix_up_power(struct acpi_device
*device
)
301 if (!device
->power
.flags
.power_resources
302 && !device
->power
.flags
.explicit_get
303 && device
->power
.state
== ACPI_STATE_D0
)
304 ret
= acpi_dev_pm_explicit_set(device
, ACPI_STATE_D0
);
309 int acpi_bus_update_power(acpi_handle handle
, int *state_p
)
311 struct acpi_device
*device
;
315 result
= acpi_bus_get_device(handle
, &device
);
319 result
= acpi_device_get_power(device
, &state
);
323 if (state
== ACPI_STATE_UNKNOWN
) {
324 state
= ACPI_STATE_D0
;
325 result
= acpi_device_set_power(device
, state
);
329 if (device
->power
.flags
.power_resources
) {
331 * We don't need to really switch the state, bu we need
332 * to update the power resources' reference counters.
334 result
= acpi_power_transition(device
, state
);
338 device
->power
.state
= state
;
345 EXPORT_SYMBOL_GPL(acpi_bus_update_power
);
347 bool acpi_bus_power_manageable(acpi_handle handle
)
349 struct acpi_device
*device
;
352 result
= acpi_bus_get_device(handle
, &device
);
353 return result
? false : device
->flags
.power_manageable
;
355 EXPORT_SYMBOL(acpi_bus_power_manageable
);
358 static DEFINE_MUTEX(acpi_pm_notifier_lock
);
361 * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
362 * @adev: ACPI device to add the notifier for.
363 * @context: Context information to pass to the notifier routine.
365 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
366 * PM wakeup events. For example, wakeup events may be generated for bridges
367 * if one of the devices below the bridge is signaling wakeup, even if the
368 * bridge itself doesn't have a wakeup GPE associated with it.
370 acpi_status
acpi_add_pm_notifier(struct acpi_device
*adev
,
371 acpi_notify_handler handler
, void *context
)
373 acpi_status status
= AE_ALREADY_EXISTS
;
375 mutex_lock(&acpi_pm_notifier_lock
);
377 if (adev
->wakeup
.flags
.notifier_present
)
380 status
= acpi_install_notify_handler(adev
->handle
,
383 if (ACPI_FAILURE(status
))
386 adev
->wakeup
.flags
.notifier_present
= true;
389 mutex_unlock(&acpi_pm_notifier_lock
);
394 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
395 * @adev: ACPI device to remove the notifier from.
397 acpi_status
acpi_remove_pm_notifier(struct acpi_device
*adev
,
398 acpi_notify_handler handler
)
400 acpi_status status
= AE_BAD_PARAMETER
;
402 mutex_lock(&acpi_pm_notifier_lock
);
404 if (!adev
->wakeup
.flags
.notifier_present
)
407 status
= acpi_remove_notify_handler(adev
->handle
,
410 if (ACPI_FAILURE(status
))
413 adev
->wakeup
.flags
.notifier_present
= false;
416 mutex_unlock(&acpi_pm_notifier_lock
);
420 bool acpi_bus_can_wakeup(acpi_handle handle
)
422 struct acpi_device
*device
;
425 result
= acpi_bus_get_device(handle
, &device
);
426 return result
? false : device
->wakeup
.flags
.valid
;
428 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
431 * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
432 * @dev: Device whose preferred target power state to return.
433 * @adev: ACPI device node corresponding to @dev.
434 * @target_state: System state to match the resultant device state.
435 * @d_min_p: Location to store the highest power state available to the device.
436 * @d_max_p: Location to store the lowest power state available to the device.
438 * Find the lowest power (highest number) and highest power (lowest number) ACPI
439 * device power states that the device can be in while the system is in the
440 * state represented by @target_state. Store the integer numbers representing
441 * those stats in the memory locations pointed to by @d_max_p and @d_min_p,
444 * Callers must ensure that @dev and @adev are valid pointers and that @adev
445 * actually corresponds to @dev before using this function.
447 * Returns 0 on success or -ENODATA when one of the ACPI methods fails or
448 * returns a value that doesn't make sense. The memory locations pointed to by
449 * @d_max_p and @d_min_p are only modified on success.
451 static int acpi_dev_pm_get_state(struct device
*dev
, struct acpi_device
*adev
,
452 u32 target_state
, int *d_min_p
, int *d_max_p
)
454 char method
[] = { '_', 'S', '0' + target_state
, 'D', '\0' };
455 acpi_handle handle
= adev
->handle
;
456 unsigned long long ret
;
462 * If the system state is S0, the lowest power state the device can be
463 * in is D3cold, unless the device has _S0W and is supposed to signal
464 * wakeup, in which case the return value of _S0W has to be used as the
465 * lowest power state available to the device.
467 d_min
= ACPI_STATE_D0
;
468 d_max
= ACPI_STATE_D3_COLD
;
471 * If present, _SxD methods return the minimum D-state (highest power
472 * state) we can use for the corresponding S-states. Otherwise, the
473 * minimum D-state is D0 (ACPI 3.x).
475 if (target_state
> ACPI_STATE_S0
) {
477 * We rely on acpi_evaluate_integer() not clobbering the integer
478 * provided if AE_NOT_FOUND is returned.
481 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
482 if ((ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
483 || ret
> ACPI_STATE_D3_COLD
)
487 * We need to handle legacy systems where D3hot and D3cold are
488 * the same and 3 is returned in both cases, so fall back to
489 * D3cold if D3hot is not a valid state.
491 if (!adev
->power
.states
[ret
].flags
.valid
) {
492 if (ret
== ACPI_STATE_D3_HOT
)
493 ret
= ACPI_STATE_D3_COLD
;
498 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
499 && adev
->wakeup
.sleep_state
>= target_state
;
500 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
502 wakeup
= adev
->wakeup
.flags
.valid
;
506 * If _PRW says we can wake up the system from the target sleep state,
507 * the D-state returned by _SxD is sufficient for that (we assume a
508 * wakeup-aware driver if wake is set). Still, if _SxW exists
509 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
510 * can wake the system. _S0W may be valid, too.
514 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
515 if (status
== AE_NOT_FOUND
) {
516 if (target_state
> ACPI_STATE_S0
)
518 } else if (ACPI_SUCCESS(status
) && ret
<= ACPI_STATE_D3_COLD
) {
519 /* Fall back to D3cold if ret is not a valid state. */
520 if (!adev
->power
.states
[ret
].flags
.valid
)
521 ret
= ACPI_STATE_D3_COLD
;
523 d_max
= ret
> d_min
? ret
: d_min
;
539 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
540 * @dev: Device whose preferred target power state to return.
541 * @d_min_p: Location to store the upper limit of the allowed states range.
542 * @d_max_in: Deepest low-power state to take into consideration.
543 * Return value: Preferred power state of the device on success, -ENODEV
544 * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
545 * incorrect, or -ENODATA on ACPI method failure.
547 * The caller must ensure that @dev is valid before using this function.
549 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
551 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
552 struct acpi_device
*adev
;
553 int ret
, d_min
, d_max
;
555 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3_COLD
)
558 if (d_max_in
> ACPI_STATE_D3_HOT
) {
559 enum pm_qos_flags_status stat
;
561 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
562 if (stat
== PM_QOS_FLAGS_ALL
)
563 d_max_in
= ACPI_STATE_D3_HOT
;
566 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
567 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
571 ret
= acpi_dev_pm_get_state(dev
, adev
, acpi_target_system_state(),
576 if (d_max_in
< d_min
)
579 if (d_max
> d_max_in
) {
580 for (d_max
= d_max_in
; d_max
> d_min
; d_max
--) {
581 if (adev
->power
.states
[d_max
].flags
.valid
)
591 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
593 #ifdef CONFIG_PM_RUNTIME
595 * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
596 * @handle: ACPI handle of the device the notification is for.
597 * @event: Type of the signaled event.
598 * @context: Device corresponding to @handle.
600 static void acpi_wakeup_device(acpi_handle handle
, u32 event
, void *context
)
602 struct device
*dev
= context
;
604 if (event
== ACPI_NOTIFY_DEVICE_WAKE
&& dev
) {
605 pm_wakeup_event(dev
, 0);
606 pm_runtime_resume(dev
);
611 * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
612 * @adev: ACPI device to enable/disable the remote wakeup for.
613 * @enable: Whether to enable or disable the wakeup functionality.
615 * Enable/disable the GPE associated with @adev so that it can generate
616 * wakeup signals for the device in response to external (remote) events and
617 * enable/disable device wakeup power.
619 * Callers must ensure that @adev is a valid ACPI device node before executing
622 int __acpi_device_run_wake(struct acpi_device
*adev
, bool enable
)
624 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
630 error
= acpi_enable_wakeup_device_power(adev
, ACPI_STATE_S0
);
634 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
635 if (ACPI_FAILURE(res
)) {
636 acpi_disable_wakeup_device_power(adev
);
640 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
641 acpi_disable_wakeup_device_power(adev
);
647 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
648 * @dev: Device to enable/disable the platform to wake up.
649 * @enable: Whether to enable or disable the wakeup functionality.
651 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
653 struct acpi_device
*adev
;
656 if (!device_run_wake(phys_dev
))
659 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
660 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
661 dev_dbg(phys_dev
, "ACPI handle without context in %s!\n",
666 return __acpi_device_run_wake(adev
, enable
);
668 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
670 static inline void acpi_wakeup_device(acpi_handle handle
, u32 event
,
672 #endif /* CONFIG_PM_RUNTIME */
674 #ifdef CONFIG_PM_SLEEP
676 * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
677 * @dev: Device to enable/desible to wake up the system.
678 * @target_state: System state the device is supposed to wake up from.
679 * @enable: Whether to enable or disable @dev to wake up the system.
681 int __acpi_device_sleep_wake(struct acpi_device
*adev
, u32 target_state
,
685 acpi_enable_wakeup_device_power(adev
, target_state
) :
686 acpi_disable_wakeup_device_power(adev
);
690 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
691 * @dev: Device to enable/desible to wake up the system from sleep states.
692 * @enable: Whether to enable or disable @dev to wake up the system.
694 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
697 struct acpi_device
*adev
;
700 if (!device_can_wakeup(dev
))
703 handle
= DEVICE_ACPI_HANDLE(dev
);
704 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
705 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
709 error
= __acpi_device_sleep_wake(adev
, acpi_target_system_state(),
712 dev_info(dev
, "System wakeup %s by ACPI\n",
713 enable
? "enabled" : "disabled");
717 #endif /* CONFIG_PM_SLEEP */
720 * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
721 * @dev: Device to get the ACPI node for.
723 struct acpi_device
*acpi_dev_pm_get_node(struct device
*dev
)
725 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
726 struct acpi_device
*adev
;
728 return handle
&& !acpi_bus_get_device(handle
, &adev
) ? adev
: NULL
;
732 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
733 * @dev: Device to put into a low-power state.
734 * @adev: ACPI device node corresponding to @dev.
735 * @system_state: System state to choose the device state for.
737 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
742 if (!acpi_device_power_manageable(adev
))
745 ret
= acpi_dev_pm_get_state(dev
, adev
, system_state
, NULL
, &state
);
746 return ret
? ret
: acpi_device_set_power(adev
, state
);
750 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
751 * @adev: ACPI device node to put into the full-power state.
753 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
755 return acpi_device_power_manageable(adev
) ?
756 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
759 #ifdef CONFIG_PM_RUNTIME
761 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
762 * @dev: Device to put into a low-power state.
764 * Put the given device into a runtime low-power state using the standard ACPI
765 * mechanism. Set up remote wakeup if desired, choose the state to put the
766 * device into (this checks if remote wakeup is expected to work too), and set
767 * the power state of the device.
769 int acpi_dev_runtime_suspend(struct device
*dev
)
771 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
778 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
780 error
= __acpi_device_run_wake(adev
, remote_wakeup
);
781 if (remote_wakeup
&& error
)
784 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
786 __acpi_device_run_wake(adev
, false);
790 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
793 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
794 * @dev: Device to put into the full-power state.
796 * Put the given device into the full-power state using the standard ACPI
797 * mechanism at run time. Set the power state of the device to ACPI D0 and
798 * disable remote wakeup.
800 int acpi_dev_runtime_resume(struct device
*dev
)
802 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
808 error
= acpi_dev_pm_full_power(adev
);
809 __acpi_device_run_wake(adev
, false);
812 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
815 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
816 * @dev: Device to suspend.
818 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
819 * it into a runtime low-power state.
821 int acpi_subsys_runtime_suspend(struct device
*dev
)
823 int ret
= pm_generic_runtime_suspend(dev
);
824 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
826 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
829 * acpi_subsys_runtime_resume - Resume device using ACPI.
830 * @dev: Device to Resume.
832 * Use ACPI to put the given device into the full-power state and carry out the
833 * generic runtime resume procedure for it.
835 int acpi_subsys_runtime_resume(struct device
*dev
)
837 int ret
= acpi_dev_runtime_resume(dev
);
838 return ret
? ret
: pm_generic_runtime_resume(dev
);
840 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
841 #endif /* CONFIG_PM_RUNTIME */
843 #ifdef CONFIG_PM_SLEEP
845 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
846 * @dev: Device to put into a low-power state.
848 * Put the given device into a low-power state during system transition to a
849 * sleep state using the standard ACPI mechanism. Set up system wakeup if
850 * desired, choose the state to put the device into (this checks if system
851 * wakeup is expected to work too), and set the power state of the device.
853 int acpi_dev_suspend_late(struct device
*dev
)
855 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
863 target_state
= acpi_target_system_state();
864 wakeup
= device_may_wakeup(dev
);
865 error
= __acpi_device_sleep_wake(adev
, target_state
, wakeup
);
869 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
871 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
875 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
878 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
879 * @dev: Device to put into the full-power state.
881 * Put the given device into the full-power state using the standard ACPI
882 * mechanism during system transition to the working state. Set the power
883 * state of the device to ACPI D0 and disable remote wakeup.
885 int acpi_dev_resume_early(struct device
*dev
)
887 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
893 error
= acpi_dev_pm_full_power(adev
);
894 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
897 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
900 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
901 * @dev: Device to prepare.
903 int acpi_subsys_prepare(struct device
*dev
)
906 * Follow PCI and resume devices suspended at run time before running
907 * their system suspend callbacks.
909 pm_runtime_resume(dev
);
910 return pm_generic_prepare(dev
);
912 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
915 * acpi_subsys_suspend_late - Suspend device using ACPI.
916 * @dev: Device to suspend.
918 * Carry out the generic late suspend procedure for @dev and use ACPI to put
919 * it into a low-power state during system transition into a sleep state.
921 int acpi_subsys_suspend_late(struct device
*dev
)
923 int ret
= pm_generic_suspend_late(dev
);
924 return ret
? ret
: acpi_dev_suspend_late(dev
);
926 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
929 * acpi_subsys_resume_early - Resume device using ACPI.
930 * @dev: Device to Resume.
932 * Use ACPI to put the given device into the full-power state and carry out the
933 * generic early resume procedure for it during system transition into the
936 int acpi_subsys_resume_early(struct device
*dev
)
938 int ret
= acpi_dev_resume_early(dev
);
939 return ret
? ret
: pm_generic_resume_early(dev
);
941 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
942 #endif /* CONFIG_PM_SLEEP */
944 static struct dev_pm_domain acpi_general_pm_domain
= {
946 #ifdef CONFIG_PM_RUNTIME
947 .runtime_suspend
= acpi_subsys_runtime_suspend
,
948 .runtime_resume
= acpi_subsys_runtime_resume
,
950 #ifdef CONFIG_PM_SLEEP
951 .prepare
= acpi_subsys_prepare
,
952 .suspend_late
= acpi_subsys_suspend_late
,
953 .resume_early
= acpi_subsys_resume_early
,
954 .poweroff_late
= acpi_subsys_suspend_late
,
955 .restore_early
= acpi_subsys_resume_early
,
961 * acpi_dev_pm_attach - Prepare device for ACPI power management.
962 * @dev: Device to prepare.
963 * @power_on: Whether or not to power on the device.
965 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
966 * attached to it, install a wakeup notification handler for the device and
967 * add it to the general ACPI PM domain. If @power_on is set, the device will
968 * be put into the ACPI D0 state before the function returns.
970 * This assumes that the @dev's bus type uses generic power management callbacks
971 * (or doesn't use any power management callbacks at all).
973 * Callers must ensure proper synchronization of this function with power
974 * management callbacks.
976 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
978 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
986 acpi_add_pm_notifier(adev
, acpi_wakeup_device
, dev
);
987 dev
->pm_domain
= &acpi_general_pm_domain
;
989 acpi_dev_pm_full_power(adev
);
990 __acpi_device_run_wake(adev
, false);
994 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
997 * acpi_dev_pm_detach - Remove ACPI power management from the device.
998 * @dev: Device to take care of.
999 * @power_off: Whether or not to try to remove power from the device.
1001 * Remove the device from the general ACPI PM domain and remove its wakeup
1002 * notifier. If @power_off is set, additionally remove power from the device if
1005 * Callers must ensure proper synchronization of this function with power
1006 * management callbacks.
1008 void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
1010 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
1012 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
1013 dev
->pm_domain
= NULL
;
1014 acpi_remove_pm_notifier(adev
, acpi_wakeup_device
);
1017 * If the device's PM QoS resume latency limit or flags
1018 * have been exposed to user space, they have to be
1019 * hidden at this point, so that they don't affect the
1020 * choice of the low-power state to put the device into.
1022 dev_pm_qos_hide_latency_limit(dev
);
1023 dev_pm_qos_hide_flags(dev
);
1024 __acpi_device_run_wake(adev
, false);
1025 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
1029 EXPORT_SYMBOL_GPL(acpi_dev_pm_detach
);
1030 #endif /* CONFIG_PM */