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
123 if (device
->parent
&& device
->parent
->power
.state
== ACPI_STATE_UNKNOWN
124 && result
== ACPI_STATE_D0
)
125 device
->parent
->power
.state
= ACPI_STATE_D0
;
130 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is %s\n",
131 device
->pnp
.bus_id
, acpi_power_state_string(*state
)));
136 static int acpi_dev_pm_explicit_set(struct acpi_device
*adev
, int state
)
138 if (adev
->power
.states
[state
].flags
.explicit_set
) {
139 char method
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
142 status
= acpi_evaluate_object(adev
->handle
, method
, NULL
, NULL
);
143 if (ACPI_FAILURE(status
))
150 * acpi_device_set_power - Set power state of an ACPI device.
151 * @device: Device to set the power state of.
152 * @state: New power state to set.
154 * Callers must ensure that the device is power manageable before using this
157 int acpi_device_set_power(struct acpi_device
*device
, int state
)
160 bool cut_power
= false;
162 if (!device
|| (state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3_COLD
))
165 /* Make sure this is a valid target state */
167 if (state
== device
->power
.state
) {
168 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device is already at %s\n",
169 acpi_power_state_string(state
)));
173 if (!device
->power
.states
[state
].flags
.valid
) {
174 printk(KERN_WARNING PREFIX
"Device does not support %s\n",
175 acpi_power_state_string(state
));
178 if (device
->parent
&& (state
< device
->parent
->power
.state
)) {
179 printk(KERN_WARNING PREFIX
180 "Cannot set device to a higher-powered"
181 " state than parent\n");
185 /* For D3cold we should first transition into D3hot. */
186 if (state
== ACPI_STATE_D3_COLD
187 && device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
) {
188 state
= ACPI_STATE_D3_HOT
;
192 if (state
< device
->power
.state
&& state
!= ACPI_STATE_D0
193 && device
->power
.state
>= ACPI_STATE_D3_HOT
) {
194 printk(KERN_WARNING PREFIX
195 "Cannot transition to non-D0 state from D3\n");
202 * In accordance with the ACPI specification first apply power (via
203 * power resources) and then evalute _PSx.
205 if (device
->power
.flags
.power_resources
) {
206 result
= acpi_power_transition(device
, state
);
210 result
= acpi_dev_pm_explicit_set(device
, state
);
215 device
->power
.state
= state
;
216 state
= ACPI_STATE_D3_COLD
;
217 result
= acpi_power_transition(device
, state
);
222 printk(KERN_WARNING PREFIX
223 "Device [%s] failed to transition to %s\n",
225 acpi_power_state_string(state
));
227 device
->power
.state
= state
;
228 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
229 "Device [%s] transitioned to %s\n",
231 acpi_power_state_string(state
)));
236 EXPORT_SYMBOL(acpi_device_set_power
);
238 int acpi_bus_set_power(acpi_handle handle
, int state
)
240 struct acpi_device
*device
;
243 result
= acpi_bus_get_device(handle
, &device
);
247 if (!device
->flags
.power_manageable
) {
248 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
249 "Device [%s] is not power manageable\n",
250 dev_name(&device
->dev
)));
254 return acpi_device_set_power(device
, state
);
256 EXPORT_SYMBOL(acpi_bus_set_power
);
258 int acpi_bus_init_power(struct acpi_device
*device
)
266 device
->power
.state
= ACPI_STATE_UNKNOWN
;
268 result
= acpi_device_get_power(device
, &state
);
272 if (state
< ACPI_STATE_D3_COLD
&& device
->power
.flags
.power_resources
) {
273 result
= acpi_power_on_resources(device
, state
);
277 result
= acpi_dev_pm_explicit_set(device
, state
);
280 } else if (state
== ACPI_STATE_UNKNOWN
) {
281 /* No power resources and missing _PSC? Try to force D0. */
282 state
= ACPI_STATE_D0
;
283 result
= acpi_dev_pm_explicit_set(device
, state
);
287 device
->power
.state
= state
;
291 int acpi_bus_update_power(acpi_handle handle
, int *state_p
)
293 struct acpi_device
*device
;
297 result
= acpi_bus_get_device(handle
, &device
);
301 result
= acpi_device_get_power(device
, &state
);
305 if (state
== ACPI_STATE_UNKNOWN
)
306 state
= ACPI_STATE_D0
;
308 result
= acpi_device_set_power(device
, state
);
309 if (!result
&& state_p
)
314 EXPORT_SYMBOL_GPL(acpi_bus_update_power
);
316 bool acpi_bus_power_manageable(acpi_handle handle
)
318 struct acpi_device
*device
;
321 result
= acpi_bus_get_device(handle
, &device
);
322 return result
? false : device
->flags
.power_manageable
;
324 EXPORT_SYMBOL(acpi_bus_power_manageable
);
327 static DEFINE_MUTEX(acpi_pm_notifier_lock
);
330 * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
331 * @adev: ACPI device to add the notifier for.
332 * @context: Context information to pass to the notifier routine.
334 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
335 * PM wakeup events. For example, wakeup events may be generated for bridges
336 * if one of the devices below the bridge is signaling wakeup, even if the
337 * bridge itself doesn't have a wakeup GPE associated with it.
339 acpi_status
acpi_add_pm_notifier(struct acpi_device
*adev
,
340 acpi_notify_handler handler
, void *context
)
342 acpi_status status
= AE_ALREADY_EXISTS
;
344 mutex_lock(&acpi_pm_notifier_lock
);
346 if (adev
->wakeup
.flags
.notifier_present
)
349 status
= acpi_install_notify_handler(adev
->handle
,
352 if (ACPI_FAILURE(status
))
355 adev
->wakeup
.flags
.notifier_present
= true;
358 mutex_unlock(&acpi_pm_notifier_lock
);
363 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
364 * @adev: ACPI device to remove the notifier from.
366 acpi_status
acpi_remove_pm_notifier(struct acpi_device
*adev
,
367 acpi_notify_handler handler
)
369 acpi_status status
= AE_BAD_PARAMETER
;
371 mutex_lock(&acpi_pm_notifier_lock
);
373 if (!adev
->wakeup
.flags
.notifier_present
)
376 status
= acpi_remove_notify_handler(adev
->handle
,
379 if (ACPI_FAILURE(status
))
382 adev
->wakeup
.flags
.notifier_present
= false;
385 mutex_unlock(&acpi_pm_notifier_lock
);
389 bool acpi_bus_can_wakeup(acpi_handle handle
)
391 struct acpi_device
*device
;
394 result
= acpi_bus_get_device(handle
, &device
);
395 return result
? false : device
->wakeup
.flags
.valid
;
397 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
400 * acpi_device_power_state - Get preferred power state of ACPI device.
401 * @dev: Device whose preferred target power state to return.
402 * @adev: ACPI device node corresponding to @dev.
403 * @target_state: System state to match the resultant device state.
404 * @d_max_in: Deepest low-power state to take into consideration.
405 * @d_min_p: Location to store the upper limit of the allowed states range.
406 * Return value: Preferred power state of the device on success, -ENODEV
407 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
409 * Find the lowest power (highest number) ACPI device power state that the
410 * device can be in while the system is in the state represented by
411 * @target_state. If @d_min_p is set, the highest power (lowest number) device
412 * power state that @dev can be in for the given system sleep state is stored
413 * at the location pointed to by it.
415 * Callers must ensure that @dev and @adev are valid pointers and that @adev
416 * actually corresponds to @dev before using this function.
418 int acpi_device_power_state(struct device
*dev
, struct acpi_device
*adev
,
419 u32 target_state
, int d_max_in
, int *d_min_p
)
421 char acpi_method
[] = "_SxD";
422 unsigned long long d_min
, d_max
;
425 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3
)
428 if (d_max_in
> ACPI_STATE_D3_HOT
) {
429 enum pm_qos_flags_status stat
;
431 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
432 if (stat
== PM_QOS_FLAGS_ALL
)
433 d_max_in
= ACPI_STATE_D3_HOT
;
436 acpi_method
[2] = '0' + target_state
;
438 * If the sleep state is S0, the lowest limit from ACPI is D3,
439 * but if the device has _S0W, we will use the value from _S0W
440 * as the lowest limit from ACPI. Finally, we will constrain
441 * the lowest limit with the specified one.
443 d_min
= ACPI_STATE_D0
;
444 d_max
= ACPI_STATE_D3
;
447 * If present, _SxD methods return the minimum D-state (highest power
448 * state) we can use for the corresponding S-states. Otherwise, the
449 * minimum D-state is D0 (ACPI 3.x).
451 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
452 * provided -- that's our fault recovery, we ignore retval.
454 if (target_state
> ACPI_STATE_S0
) {
455 acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
, &d_min
);
456 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
457 && adev
->wakeup
.sleep_state
>= target_state
;
458 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
460 wakeup
= adev
->wakeup
.flags
.valid
;
464 * If _PRW says we can wake up the system from the target sleep state,
465 * the D-state returned by _SxD is sufficient for that (we assume a
466 * wakeup-aware driver if wake is set). Still, if _SxW exists
467 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
468 * can wake the system. _S0W may be valid, too.
473 acpi_method
[3] = 'W';
474 status
= acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
,
476 if (ACPI_FAILURE(status
)) {
477 if (target_state
!= ACPI_STATE_S0
||
478 status
!= AE_NOT_FOUND
)
480 } else if (d_max
< d_min
) {
481 /* Warn the user of the broken DSDT */
482 printk(KERN_WARNING
"ACPI: Wrong value from %s\n",
489 if (d_max_in
< d_min
)
493 /* constrain d_max with specified lowest limit (max number) */
494 if (d_max
> d_max_in
) {
495 for (d_max
= d_max_in
; d_max
> d_min
; d_max
--) {
496 if (adev
->power
.states
[d_max
].flags
.valid
)
502 EXPORT_SYMBOL_GPL(acpi_device_power_state
);
505 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
506 * @dev: Device whose preferred target power state to return.
507 * @d_min_p: Location to store the upper limit of the allowed states range.
508 * @d_max_in: Deepest low-power state to take into consideration.
509 * Return value: Preferred power state of the device on success, -ENODEV
510 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
512 * The caller must ensure that @dev is valid before using this function.
514 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
516 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
517 struct acpi_device
*adev
;
519 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
520 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
524 return acpi_device_power_state(dev
, adev
, acpi_target_system_state(),
527 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
529 #ifdef CONFIG_PM_RUNTIME
531 * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
532 * @handle: ACPI handle of the device the notification is for.
533 * @event: Type of the signaled event.
534 * @context: Device corresponding to @handle.
536 static void acpi_wakeup_device(acpi_handle handle
, u32 event
, void *context
)
538 struct device
*dev
= context
;
540 if (event
== ACPI_NOTIFY_DEVICE_WAKE
&& dev
) {
541 pm_wakeup_event(dev
, 0);
542 pm_runtime_resume(dev
);
547 * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
548 * @adev: ACPI device to enable/disable the remote wakeup for.
549 * @enable: Whether to enable or disable the wakeup functionality.
551 * Enable/disable the GPE associated with @adev so that it can generate
552 * wakeup signals for the device in response to external (remote) events and
553 * enable/disable device wakeup power.
555 * Callers must ensure that @adev is a valid ACPI device node before executing
558 int __acpi_device_run_wake(struct acpi_device
*adev
, bool enable
)
560 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
566 error
= acpi_enable_wakeup_device_power(adev
, ACPI_STATE_S0
);
570 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
571 if (ACPI_FAILURE(res
)) {
572 acpi_disable_wakeup_device_power(adev
);
576 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
577 acpi_disable_wakeup_device_power(adev
);
583 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
584 * @dev: Device to enable/disable the platform to wake up.
585 * @enable: Whether to enable or disable the wakeup functionality.
587 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
589 struct acpi_device
*adev
;
592 if (!device_run_wake(phys_dev
))
595 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
596 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
597 dev_dbg(phys_dev
, "ACPI handle without context in %s!\n",
602 return __acpi_device_run_wake(adev
, enable
);
604 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
606 static inline void acpi_wakeup_device(acpi_handle handle
, u32 event
,
608 #endif /* CONFIG_PM_RUNTIME */
610 #ifdef CONFIG_PM_SLEEP
612 * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
613 * @dev: Device to enable/desible to wake up the system.
614 * @target_state: System state the device is supposed to wake up from.
615 * @enable: Whether to enable or disable @dev to wake up the system.
617 int __acpi_device_sleep_wake(struct acpi_device
*adev
, u32 target_state
,
621 acpi_enable_wakeup_device_power(adev
, target_state
) :
622 acpi_disable_wakeup_device_power(adev
);
626 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
627 * @dev: Device to enable/desible to wake up the system from sleep states.
628 * @enable: Whether to enable or disable @dev to wake up the system.
630 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
633 struct acpi_device
*adev
;
636 if (!device_can_wakeup(dev
))
639 handle
= DEVICE_ACPI_HANDLE(dev
);
640 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
641 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
645 error
= __acpi_device_sleep_wake(adev
, acpi_target_system_state(),
648 dev_info(dev
, "System wakeup %s by ACPI\n",
649 enable
? "enabled" : "disabled");
653 #endif /* CONFIG_PM_SLEEP */
656 * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
657 * @dev: Device to get the ACPI node for.
659 struct acpi_device
*acpi_dev_pm_get_node(struct device
*dev
)
661 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
662 struct acpi_device
*adev
;
664 return handle
&& !acpi_bus_get_device(handle
, &adev
) ? adev
: NULL
;
668 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
669 * @dev: Device to put into a low-power state.
670 * @adev: ACPI device node corresponding to @dev.
671 * @system_state: System state to choose the device state for.
673 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
678 if (!acpi_device_power_manageable(adev
))
681 power_state
= acpi_device_power_state(dev
, adev
, system_state
,
682 ACPI_STATE_D3
, NULL
);
683 if (power_state
< ACPI_STATE_D0
|| power_state
> ACPI_STATE_D3
)
686 return acpi_device_set_power(adev
, power_state
);
690 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
691 * @adev: ACPI device node to put into the full-power state.
693 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
695 return acpi_device_power_manageable(adev
) ?
696 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
699 #ifdef CONFIG_PM_RUNTIME
701 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
702 * @dev: Device to put into a low-power state.
704 * Put the given device into a runtime low-power state using the standard ACPI
705 * mechanism. Set up remote wakeup if desired, choose the state to put the
706 * device into (this checks if remote wakeup is expected to work too), and set
707 * the power state of the device.
709 int acpi_dev_runtime_suspend(struct device
*dev
)
711 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
718 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
720 error
= __acpi_device_run_wake(adev
, remote_wakeup
);
721 if (remote_wakeup
&& error
)
724 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
726 __acpi_device_run_wake(adev
, false);
730 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
733 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
734 * @dev: Device to put into the full-power state.
736 * Put the given device into the full-power state using the standard ACPI
737 * mechanism at run time. Set the power state of the device to ACPI D0 and
738 * disable remote wakeup.
740 int acpi_dev_runtime_resume(struct device
*dev
)
742 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
748 error
= acpi_dev_pm_full_power(adev
);
749 __acpi_device_run_wake(adev
, false);
752 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
755 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
756 * @dev: Device to suspend.
758 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
759 * it into a runtime low-power state.
761 int acpi_subsys_runtime_suspend(struct device
*dev
)
763 int ret
= pm_generic_runtime_suspend(dev
);
764 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
766 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
769 * acpi_subsys_runtime_resume - Resume device using ACPI.
770 * @dev: Device to Resume.
772 * Use ACPI to put the given device into the full-power state and carry out the
773 * generic runtime resume procedure for it.
775 int acpi_subsys_runtime_resume(struct device
*dev
)
777 int ret
= acpi_dev_runtime_resume(dev
);
778 return ret
? ret
: pm_generic_runtime_resume(dev
);
780 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
781 #endif /* CONFIG_PM_RUNTIME */
783 #ifdef CONFIG_PM_SLEEP
785 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
786 * @dev: Device to put into a low-power state.
788 * Put the given device into a low-power state during system transition to a
789 * sleep state using the standard ACPI mechanism. Set up system wakeup if
790 * desired, choose the state to put the device into (this checks if system
791 * wakeup is expected to work too), and set the power state of the device.
793 int acpi_dev_suspend_late(struct device
*dev
)
795 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
803 target_state
= acpi_target_system_state();
804 wakeup
= device_may_wakeup(dev
);
805 error
= __acpi_device_sleep_wake(adev
, target_state
, wakeup
);
809 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
811 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
815 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
818 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
819 * @dev: Device to put into the full-power state.
821 * Put the given device into the full-power state using the standard ACPI
822 * mechanism during system transition to the working state. Set the power
823 * state of the device to ACPI D0 and disable remote wakeup.
825 int acpi_dev_resume_early(struct device
*dev
)
827 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
833 error
= acpi_dev_pm_full_power(adev
);
834 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
837 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
840 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
841 * @dev: Device to prepare.
843 int acpi_subsys_prepare(struct device
*dev
)
846 * Follow PCI and resume devices suspended at run time before running
847 * their system suspend callbacks.
849 pm_runtime_resume(dev
);
850 return pm_generic_prepare(dev
);
852 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
855 * acpi_subsys_suspend_late - Suspend device using ACPI.
856 * @dev: Device to suspend.
858 * Carry out the generic late suspend procedure for @dev and use ACPI to put
859 * it into a low-power state during system transition into a sleep state.
861 int acpi_subsys_suspend_late(struct device
*dev
)
863 int ret
= pm_generic_suspend_late(dev
);
864 return ret
? ret
: acpi_dev_suspend_late(dev
);
866 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
869 * acpi_subsys_resume_early - Resume device using ACPI.
870 * @dev: Device to Resume.
872 * Use ACPI to put the given device into the full-power state and carry out the
873 * generic early resume procedure for it during system transition into the
876 int acpi_subsys_resume_early(struct device
*dev
)
878 int ret
= acpi_dev_resume_early(dev
);
879 return ret
? ret
: pm_generic_resume_early(dev
);
881 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
882 #endif /* CONFIG_PM_SLEEP */
884 static struct dev_pm_domain acpi_general_pm_domain
= {
886 #ifdef CONFIG_PM_RUNTIME
887 .runtime_suspend
= acpi_subsys_runtime_suspend
,
888 .runtime_resume
= acpi_subsys_runtime_resume
,
889 .runtime_idle
= pm_generic_runtime_idle
,
891 #ifdef CONFIG_PM_SLEEP
892 .prepare
= acpi_subsys_prepare
,
893 .suspend_late
= acpi_subsys_suspend_late
,
894 .resume_early
= acpi_subsys_resume_early
,
895 .poweroff_late
= acpi_subsys_suspend_late
,
896 .restore_early
= acpi_subsys_resume_early
,
902 * acpi_dev_pm_attach - Prepare device for ACPI power management.
903 * @dev: Device to prepare.
904 * @power_on: Whether or not to power on the device.
906 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
907 * attached to it, install a wakeup notification handler for the device and
908 * add it to the general ACPI PM domain. If @power_on is set, the device will
909 * be put into the ACPI D0 state before the function returns.
911 * This assumes that the @dev's bus type uses generic power management callbacks
912 * (or doesn't use any power management callbacks at all).
914 * Callers must ensure proper synchronization of this function with power
915 * management callbacks.
917 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
919 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
927 acpi_add_pm_notifier(adev
, acpi_wakeup_device
, dev
);
928 dev
->pm_domain
= &acpi_general_pm_domain
;
930 acpi_dev_pm_full_power(adev
);
931 __acpi_device_run_wake(adev
, false);
935 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
938 * acpi_dev_pm_detach - Remove ACPI power management from the device.
939 * @dev: Device to take care of.
940 * @power_off: Whether or not to try to remove power from the device.
942 * Remove the device from the general ACPI PM domain and remove its wakeup
943 * notifier. If @power_off is set, additionally remove power from the device if
946 * Callers must ensure proper synchronization of this function with power
947 * management callbacks.
949 void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
951 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
953 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
954 dev
->pm_domain
= NULL
;
955 acpi_remove_pm_notifier(adev
, acpi_wakeup_device
);
958 * If the device's PM QoS resume latency limit or flags
959 * have been exposed to user space, they have to be
960 * hidden at this point, so that they don't affect the
961 * choice of the low-power state to put the device into.
963 dev_pm_qos_hide_latency_limit(dev
);
964 dev_pm_qos_hide_flags(dev
);
965 __acpi_device_run_wake(adev
, false);
966 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
970 EXPORT_SYMBOL_GPL(acpi_dev_pm_detach
);
973 * acpi_dev_pm_add_dependent - Add physical device depending for PM.
974 * @handle: Handle of ACPI device node.
975 * @depdev: Device depending on that node for PM.
977 void acpi_dev_pm_add_dependent(acpi_handle handle
, struct device
*depdev
)
979 struct acpi_device_physical_node
*dep
;
980 struct acpi_device
*adev
;
982 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
985 mutex_lock(&adev
->physical_node_lock
);
987 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
988 if (dep
->dev
== depdev
)
991 dep
= kzalloc(sizeof(*dep
), GFP_KERNEL
);
994 list_add_tail(&dep
->node
, &adev
->power_dependent
);
998 mutex_unlock(&adev
->physical_node_lock
);
1000 EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent
);
1003 * acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
1004 * @handle: Handle of ACPI device node.
1005 * @depdev: Device depending on that node for PM.
1007 void acpi_dev_pm_remove_dependent(acpi_handle handle
, struct device
*depdev
)
1009 struct acpi_device_physical_node
*dep
;
1010 struct acpi_device
*adev
;
1012 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
1015 mutex_lock(&adev
->physical_node_lock
);
1017 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
1018 if (dep
->dev
== depdev
) {
1019 list_del(&dep
->node
);
1024 mutex_unlock(&adev
->physical_node_lock
);
1026 EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent
);
1027 #endif /* CONFIG_PM */