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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 #include <linux/acpi.h>
22 #include <linux/export.h>
23 #include <linux/mutex.h>
24 #include <linux/pm_qos.h>
25 #include <linux/pm_domain.h>
26 #include <linux/pm_runtime.h>
27 #include <linux/suspend.h>
31 #define _COMPONENT ACPI_POWER_COMPONENT
32 ACPI_MODULE_NAME("device_pm");
35 * acpi_power_state_string - String representation of ACPI device power state.
36 * @state: ACPI device power state to return the string representation of.
38 const char *acpi_power_state_string(int state
)
47 case ACPI_STATE_D3_HOT
:
49 case ACPI_STATE_D3_COLD
:
57 * acpi_device_get_power - Get power state of an ACPI device.
58 * @device: Device to get the power state of.
59 * @state: Place to store the power state of the device.
61 * This function does not update the device's power.state field, but it may
62 * update its parent's power.state field (when the parent's power state is
63 * unknown and the device's power state turns out to be D0).
65 int acpi_device_get_power(struct acpi_device
*device
, int *state
)
67 int result
= ACPI_STATE_UNKNOWN
;
69 if (!device
|| !state
)
72 if (!device
->flags
.power_manageable
) {
73 /* TBD: Non-recursive algorithm for walking up hierarchy. */
74 *state
= device
->parent
?
75 device
->parent
->power
.state
: ACPI_STATE_D0
;
80 * Get the device's power state from power resources settings and _PSC,
83 if (device
->power
.flags
.power_resources
) {
84 int error
= acpi_power_get_inferred_state(device
, &result
);
88 if (device
->power
.flags
.explicit_get
) {
89 acpi_handle handle
= device
->handle
;
90 unsigned long long psc
;
93 status
= acpi_evaluate_integer(handle
, "_PSC", NULL
, &psc
);
94 if (ACPI_FAILURE(status
))
98 * The power resources settings may indicate a power state
99 * shallower than the actual power state of the device, because
100 * the same power resources may be referenced by other devices.
102 * For systems predating ACPI 4.0 we assume that D3hot is the
103 * deepest state that can be supported.
105 if (psc
> result
&& psc
< ACPI_STATE_D3_COLD
)
107 else if (result
== ACPI_STATE_UNKNOWN
)
108 result
= psc
> ACPI_STATE_D2
? ACPI_STATE_D3_HOT
: psc
;
112 * If we were unsure about the device parent's power state up to this
113 * point, the fact that the device is in D0 implies that the parent has
114 * to be in D0 too, except if ignore_parent is set.
116 if (!device
->power
.flags
.ignore_parent
&& device
->parent
117 && device
->parent
->power
.state
== ACPI_STATE_UNKNOWN
118 && result
== ACPI_STATE_D0
)
119 device
->parent
->power
.state
= ACPI_STATE_D0
;
124 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is %s\n",
125 device
->pnp
.bus_id
, acpi_power_state_string(*state
)));
130 static int acpi_dev_pm_explicit_set(struct acpi_device
*adev
, int state
)
132 if (adev
->power
.states
[state
].flags
.explicit_set
) {
133 char method
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
136 status
= acpi_evaluate_object(adev
->handle
, method
, NULL
, NULL
);
137 if (ACPI_FAILURE(status
))
144 * acpi_device_set_power - Set power state of an ACPI device.
145 * @device: Device to set the power state of.
146 * @state: New power state to set.
148 * Callers must ensure that the device is power manageable before using this
151 int acpi_device_set_power(struct acpi_device
*device
, int state
)
153 int target_state
= state
;
156 if (!device
|| !device
->flags
.power_manageable
157 || (state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3_COLD
))
160 /* Make sure this is a valid target state */
162 if (state
== device
->power
.state
) {
163 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] already in %s\n",
165 acpi_power_state_string(state
)));
169 if (state
== ACPI_STATE_D3_COLD
) {
171 * For transitions to D3cold we need to execute _PS3 and then
172 * possibly drop references to the power resources in use.
174 state
= ACPI_STATE_D3_HOT
;
175 /* If _PR3 is not available, use D3hot as the target state. */
176 if (!device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.valid
)
177 target_state
= state
;
178 } else if (!device
->power
.states
[state
].flags
.valid
) {
179 dev_warn(&device
->dev
, "Power state %s not supported\n",
180 acpi_power_state_string(state
));
184 if (!device
->power
.flags
.ignore_parent
&&
185 device
->parent
&& (state
< device
->parent
->power
.state
)) {
186 dev_warn(&device
->dev
,
187 "Cannot transition to power state %s for parent in %s\n",
188 acpi_power_state_string(state
),
189 acpi_power_state_string(device
->parent
->power
.state
));
196 * In accordance with ACPI 6, _PSx is executed before manipulating power
197 * resources, unless the target state is D0, in which case _PS0 is
198 * supposed to be executed after turning the power resources on.
200 if (state
> ACPI_STATE_D0
) {
202 * According to ACPI 6, devices cannot go from lower-power
203 * (deeper) states to higher-power (shallower) states.
205 if (state
< device
->power
.state
) {
206 dev_warn(&device
->dev
, "Cannot transition from %s to %s\n",
207 acpi_power_state_string(device
->power
.state
),
208 acpi_power_state_string(state
));
212 result
= acpi_dev_pm_explicit_set(device
, state
);
216 if (device
->power
.flags
.power_resources
)
217 result
= acpi_power_transition(device
, target_state
);
219 if (device
->power
.flags
.power_resources
) {
220 result
= acpi_power_transition(device
, ACPI_STATE_D0
);
224 result
= acpi_dev_pm_explicit_set(device
, ACPI_STATE_D0
);
229 dev_warn(&device
->dev
, "Failed to change power state to %s\n",
230 acpi_power_state_string(state
));
232 device
->power
.state
= target_state
;
233 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
234 "Device [%s] transitioned to %s\n",
236 acpi_power_state_string(state
)));
241 EXPORT_SYMBOL(acpi_device_set_power
);
243 int acpi_bus_set_power(acpi_handle handle
, int state
)
245 struct acpi_device
*device
;
248 result
= acpi_bus_get_device(handle
, &device
);
252 return acpi_device_set_power(device
, state
);
254 EXPORT_SYMBOL(acpi_bus_set_power
);
256 int acpi_bus_init_power(struct acpi_device
*device
)
264 device
->power
.state
= ACPI_STATE_UNKNOWN
;
265 if (!acpi_device_is_present(device
))
268 result
= acpi_device_get_power(device
, &state
);
272 if (state
< ACPI_STATE_D3_COLD
&& device
->power
.flags
.power_resources
) {
273 /* Reference count the power resources. */
274 result
= acpi_power_on_resources(device
, state
);
278 if (state
== ACPI_STATE_D0
) {
280 * If _PSC is not present and the state inferred from
281 * power resources appears to be D0, it still may be
282 * necessary to execute _PS0 at this point, because
283 * another device using the same power resources may
284 * have been put into D0 previously and that's why we
287 result
= acpi_dev_pm_explicit_set(device
, state
);
291 } else if (state
== ACPI_STATE_UNKNOWN
) {
293 * No power resources and missing _PSC? Cross fingers and make
294 * it D0 in hope that this is what the BIOS put the device into.
295 * [We tried to force D0 here by executing _PS0, but that broke
296 * Toshiba P870-303 in a nasty way.]
298 state
= ACPI_STATE_D0
;
300 device
->power
.state
= state
;
305 * acpi_device_fix_up_power - Force device with missing _PSC into D0.
306 * @device: Device object whose power state is to be fixed up.
308 * Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
309 * are assumed to be put into D0 by the BIOS. However, in some cases that may
310 * not be the case and this function should be used then.
312 int acpi_device_fix_up_power(struct acpi_device
*device
)
316 if (!device
->power
.flags
.power_resources
317 && !device
->power
.flags
.explicit_get
318 && device
->power
.state
== ACPI_STATE_D0
)
319 ret
= acpi_dev_pm_explicit_set(device
, ACPI_STATE_D0
);
323 EXPORT_SYMBOL_GPL(acpi_device_fix_up_power
);
325 int acpi_device_update_power(struct acpi_device
*device
, int *state_p
)
330 if (device
->power
.state
== ACPI_STATE_UNKNOWN
) {
331 result
= acpi_bus_init_power(device
);
332 if (!result
&& state_p
)
333 *state_p
= device
->power
.state
;
338 result
= acpi_device_get_power(device
, &state
);
342 if (state
== ACPI_STATE_UNKNOWN
) {
343 state
= ACPI_STATE_D0
;
344 result
= acpi_device_set_power(device
, state
);
348 if (device
->power
.flags
.power_resources
) {
350 * We don't need to really switch the state, bu we need
351 * to update the power resources' reference counters.
353 result
= acpi_power_transition(device
, state
);
357 device
->power
.state
= state
;
364 EXPORT_SYMBOL_GPL(acpi_device_update_power
);
366 int acpi_bus_update_power(acpi_handle handle
, int *state_p
)
368 struct acpi_device
*device
;
371 result
= acpi_bus_get_device(handle
, &device
);
372 return result
? result
: acpi_device_update_power(device
, state_p
);
374 EXPORT_SYMBOL_GPL(acpi_bus_update_power
);
376 bool acpi_bus_power_manageable(acpi_handle handle
)
378 struct acpi_device
*device
;
381 result
= acpi_bus_get_device(handle
, &device
);
382 return result
? false : device
->flags
.power_manageable
;
384 EXPORT_SYMBOL(acpi_bus_power_manageable
);
387 static DEFINE_MUTEX(acpi_pm_notifier_lock
);
389 static void acpi_pm_notify_handler(acpi_handle handle
, u32 val
, void *not_used
)
391 struct acpi_device
*adev
;
393 if (val
!= ACPI_NOTIFY_DEVICE_WAKE
)
396 adev
= acpi_bus_get_acpi_device(handle
);
400 mutex_lock(&acpi_pm_notifier_lock
);
402 if (adev
->wakeup
.flags
.notifier_present
) {
403 pm_wakeup_ws_event(adev
->wakeup
.ws
, 0, true);
404 if (adev
->wakeup
.context
.work
.func
)
405 queue_pm_work(&adev
->wakeup
.context
.work
);
408 mutex_unlock(&acpi_pm_notifier_lock
);
410 acpi_bus_put_acpi_device(adev
);
414 * acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
415 * @adev: ACPI device to add the notify handler for.
416 * @dev: Device to generate a wakeup event for while handling the notification.
417 * @work_func: Work function to execute when handling the notification.
419 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
420 * PM wakeup events. For example, wakeup events may be generated for bridges
421 * if one of the devices below the bridge is signaling wakeup, even if the
422 * bridge itself doesn't have a wakeup GPE associated with it.
424 acpi_status
acpi_add_pm_notifier(struct acpi_device
*adev
, struct device
*dev
,
425 void (*work_func
)(struct work_struct
*work
))
427 acpi_status status
= AE_ALREADY_EXISTS
;
429 if (!dev
&& !work_func
)
430 return AE_BAD_PARAMETER
;
432 mutex_lock(&acpi_pm_notifier_lock
);
434 if (adev
->wakeup
.flags
.notifier_present
)
437 adev
->wakeup
.ws
= wakeup_source_register(dev_name(&adev
->dev
));
438 adev
->wakeup
.context
.dev
= dev
;
440 INIT_WORK(&adev
->wakeup
.context
.work
, work_func
);
442 status
= acpi_install_notify_handler(adev
->handle
, ACPI_SYSTEM_NOTIFY
,
443 acpi_pm_notify_handler
, NULL
);
444 if (ACPI_FAILURE(status
))
447 adev
->wakeup
.flags
.notifier_present
= true;
450 mutex_unlock(&acpi_pm_notifier_lock
);
455 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
456 * @adev: ACPI device to remove the notifier from.
458 acpi_status
acpi_remove_pm_notifier(struct acpi_device
*adev
)
460 acpi_status status
= AE_BAD_PARAMETER
;
462 mutex_lock(&acpi_pm_notifier_lock
);
464 if (!adev
->wakeup
.flags
.notifier_present
)
467 status
= acpi_remove_notify_handler(adev
->handle
,
469 acpi_pm_notify_handler
);
470 if (ACPI_FAILURE(status
))
473 if (adev
->wakeup
.context
.work
.func
) {
474 cancel_work_sync(&adev
->wakeup
.context
.work
);
475 adev
->wakeup
.context
.work
.func
= NULL
;
477 adev
->wakeup
.context
.dev
= NULL
;
478 wakeup_source_unregister(adev
->wakeup
.ws
);
480 adev
->wakeup
.flags
.notifier_present
= false;
483 mutex_unlock(&acpi_pm_notifier_lock
);
487 bool acpi_bus_can_wakeup(acpi_handle handle
)
489 struct acpi_device
*device
;
492 result
= acpi_bus_get_device(handle
, &device
);
493 return result
? false : device
->wakeup
.flags
.valid
;
495 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
498 * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
499 * @dev: Device whose preferred target power state to return.
500 * @adev: ACPI device node corresponding to @dev.
501 * @target_state: System state to match the resultant device state.
502 * @d_min_p: Location to store the highest power state available to the device.
503 * @d_max_p: Location to store the lowest power state available to the device.
505 * Find the lowest power (highest number) and highest power (lowest number) ACPI
506 * device power states that the device can be in while the system is in the
507 * state represented by @target_state. Store the integer numbers representing
508 * those stats in the memory locations pointed to by @d_max_p and @d_min_p,
511 * Callers must ensure that @dev and @adev are valid pointers and that @adev
512 * actually corresponds to @dev before using this function.
514 * Returns 0 on success or -ENODATA when one of the ACPI methods fails or
515 * returns a value that doesn't make sense. The memory locations pointed to by
516 * @d_max_p and @d_min_p are only modified on success.
518 static int acpi_dev_pm_get_state(struct device
*dev
, struct acpi_device
*adev
,
519 u32 target_state
, int *d_min_p
, int *d_max_p
)
521 char method
[] = { '_', 'S', '0' + target_state
, 'D', '\0' };
522 acpi_handle handle
= adev
->handle
;
523 unsigned long long ret
;
529 * If the system state is S0, the lowest power state the device can be
530 * in is D3cold, unless the device has _S0W and is supposed to signal
531 * wakeup, in which case the return value of _S0W has to be used as the
532 * lowest power state available to the device.
534 d_min
= ACPI_STATE_D0
;
535 d_max
= ACPI_STATE_D3_COLD
;
538 * If present, _SxD methods return the minimum D-state (highest power
539 * state) we can use for the corresponding S-states. Otherwise, the
540 * minimum D-state is D0 (ACPI 3.x).
542 if (target_state
> ACPI_STATE_S0
) {
544 * We rely on acpi_evaluate_integer() not clobbering the integer
545 * provided if AE_NOT_FOUND is returned.
548 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
549 if ((ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
550 || ret
> ACPI_STATE_D3_COLD
)
554 * We need to handle legacy systems where D3hot and D3cold are
555 * the same and 3 is returned in both cases, so fall back to
556 * D3cold if D3hot is not a valid state.
558 if (!adev
->power
.states
[ret
].flags
.valid
) {
559 if (ret
== ACPI_STATE_D3_HOT
)
560 ret
= ACPI_STATE_D3_COLD
;
565 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
566 && adev
->wakeup
.sleep_state
>= target_state
;
567 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
569 wakeup
= adev
->wakeup
.flags
.valid
;
573 * If _PRW says we can wake up the system from the target sleep state,
574 * the D-state returned by _SxD is sufficient for that (we assume a
575 * wakeup-aware driver if wake is set). Still, if _SxW exists
576 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
577 * can wake the system. _S0W may be valid, too.
581 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
582 if (status
== AE_NOT_FOUND
) {
583 if (target_state
> ACPI_STATE_S0
)
585 } else if (ACPI_SUCCESS(status
) && ret
<= ACPI_STATE_D3_COLD
) {
586 /* Fall back to D3cold if ret is not a valid state. */
587 if (!adev
->power
.states
[ret
].flags
.valid
)
588 ret
= ACPI_STATE_D3_COLD
;
590 d_max
= ret
> d_min
? ret
: d_min
;
606 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
607 * @dev: Device whose preferred target power state to return.
608 * @d_min_p: Location to store the upper limit of the allowed states range.
609 * @d_max_in: Deepest low-power state to take into consideration.
610 * Return value: Preferred power state of the device on success, -ENODEV
611 * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
612 * incorrect, or -ENODATA on ACPI method failure.
614 * The caller must ensure that @dev is valid before using this function.
616 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
618 struct acpi_device
*adev
;
619 int ret
, d_min
, d_max
;
621 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3_COLD
)
624 if (d_max_in
> ACPI_STATE_D2
) {
625 enum pm_qos_flags_status stat
;
627 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
628 if (stat
== PM_QOS_FLAGS_ALL
)
629 d_max_in
= ACPI_STATE_D2
;
632 adev
= ACPI_COMPANION(dev
);
634 dev_dbg(dev
, "ACPI companion missing in %s!\n", __func__
);
638 ret
= acpi_dev_pm_get_state(dev
, adev
, acpi_target_system_state(),
643 if (d_max_in
< d_min
)
646 if (d_max
> d_max_in
) {
647 for (d_max
= d_max_in
; d_max
> d_min
; d_max
--) {
648 if (adev
->power
.states
[d_max
].flags
.valid
)
658 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
661 * acpi_pm_notify_work_func - ACPI devices wakeup notification work function.
662 * @work: Work item to handle.
664 static void acpi_pm_notify_work_func(struct work_struct
*work
)
668 dev
= container_of(work
, struct acpi_device_wakeup_context
, work
)->dev
;
670 pm_wakeup_event(dev
, 0);
671 pm_runtime_resume(dev
);
676 * acpi_device_wakeup - Enable/disable wakeup functionality for device.
677 * @adev: ACPI device to enable/disable wakeup functionality for.
678 * @target_state: State the system is transitioning into.
679 * @enable: Whether to enable or disable the wakeup functionality.
681 * Enable/disable the GPE associated with @adev so that it can generate
682 * wakeup signals for the device in response to external (remote) events and
683 * enable/disable device wakeup power.
685 * Callers must ensure that @adev is a valid ACPI device node before executing
688 static int acpi_device_wakeup(struct acpi_device
*adev
, u32 target_state
,
691 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
697 error
= acpi_enable_wakeup_device_power(adev
, target_state
);
701 if (adev
->wakeup
.flags
.enabled
)
704 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
705 if (ACPI_SUCCESS(res
)) {
706 adev
->wakeup
.flags
.enabled
= 1;
708 acpi_disable_wakeup_device_power(adev
);
712 if (adev
->wakeup
.flags
.enabled
) {
713 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
714 adev
->wakeup
.flags
.enabled
= 0;
716 acpi_disable_wakeup_device_power(adev
);
722 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
723 * @dev: Device to enable/disable the platform to wake up.
724 * @enable: Whether to enable or disable the wakeup functionality.
726 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
728 struct acpi_device
*adev
;
730 if (!device_run_wake(phys_dev
))
733 adev
= ACPI_COMPANION(phys_dev
);
735 dev_dbg(phys_dev
, "ACPI companion missing in %s!\n", __func__
);
739 return acpi_device_wakeup(adev
, ACPI_STATE_S0
, enable
);
741 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
743 #ifdef CONFIG_PM_SLEEP
745 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
746 * @dev: Device to enable/desible to wake up the system from sleep states.
747 * @enable: Whether to enable or disable @dev to wake up the system.
749 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
751 struct acpi_device
*adev
;
754 if (!device_can_wakeup(dev
))
757 adev
= ACPI_COMPANION(dev
);
759 dev_dbg(dev
, "ACPI companion missing in %s!\n", __func__
);
763 error
= acpi_device_wakeup(adev
, acpi_target_system_state(), enable
);
765 dev_info(dev
, "System wakeup %s by ACPI\n",
766 enable
? "enabled" : "disabled");
770 #endif /* CONFIG_PM_SLEEP */
773 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
774 * @dev: Device to put into a low-power state.
775 * @adev: ACPI device node corresponding to @dev.
776 * @system_state: System state to choose the device state for.
778 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
783 if (!acpi_device_power_manageable(adev
))
786 ret
= acpi_dev_pm_get_state(dev
, adev
, system_state
, NULL
, &state
);
787 return ret
? ret
: acpi_device_set_power(adev
, state
);
791 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
792 * @adev: ACPI device node to put into the full-power state.
794 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
796 return acpi_device_power_manageable(adev
) ?
797 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
801 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
802 * @dev: Device to put into a low-power state.
804 * Put the given device into a runtime low-power state using the standard ACPI
805 * mechanism. Set up remote wakeup if desired, choose the state to put the
806 * device into (this checks if remote wakeup is expected to work too), and set
807 * the power state of the device.
809 int acpi_dev_runtime_suspend(struct device
*dev
)
811 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
818 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
820 error
= acpi_device_wakeup(adev
, ACPI_STATE_S0
, remote_wakeup
);
821 if (remote_wakeup
&& error
)
824 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
826 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
830 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
833 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
834 * @dev: Device to put into the full-power state.
836 * Put the given device into the full-power state using the standard ACPI
837 * mechanism at run time. Set the power state of the device to ACPI D0 and
838 * disable remote wakeup.
840 int acpi_dev_runtime_resume(struct device
*dev
)
842 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
848 error
= acpi_dev_pm_full_power(adev
);
849 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
852 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
855 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
856 * @dev: Device to suspend.
858 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
859 * it into a runtime low-power state.
861 int acpi_subsys_runtime_suspend(struct device
*dev
)
863 int ret
= pm_generic_runtime_suspend(dev
);
864 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
866 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
869 * acpi_subsys_runtime_resume - 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 runtime resume procedure for it.
875 int acpi_subsys_runtime_resume(struct device
*dev
)
877 int ret
= acpi_dev_runtime_resume(dev
);
878 return ret
? ret
: pm_generic_runtime_resume(dev
);
880 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
882 #ifdef CONFIG_PM_SLEEP
884 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
885 * @dev: Device to put into a low-power state.
887 * Put the given device into a low-power state during system transition to a
888 * sleep state using the standard ACPI mechanism. Set up system wakeup if
889 * desired, choose the state to put the device into (this checks if system
890 * wakeup is expected to work too), and set the power state of the device.
892 int acpi_dev_suspend_late(struct device
*dev
)
894 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
902 target_state
= acpi_target_system_state();
903 wakeup
= device_may_wakeup(dev
) && acpi_device_can_wakeup(adev
);
904 error
= acpi_device_wakeup(adev
, target_state
, wakeup
);
908 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
910 acpi_device_wakeup(adev
, ACPI_STATE_UNKNOWN
, false);
914 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
917 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
918 * @dev: Device to put into the full-power state.
920 * Put the given device into the full-power state using the standard ACPI
921 * mechanism during system transition to the working state. Set the power
922 * state of the device to ACPI D0 and disable remote wakeup.
924 int acpi_dev_resume_early(struct device
*dev
)
926 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
932 error
= acpi_dev_pm_full_power(adev
);
933 acpi_device_wakeup(adev
, ACPI_STATE_UNKNOWN
, false);
936 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
939 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
940 * @dev: Device to prepare.
942 int acpi_subsys_prepare(struct device
*dev
)
944 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
948 ret
= pm_generic_prepare(dev
);
952 if (!adev
|| !pm_runtime_suspended(dev
)
953 || device_may_wakeup(dev
) != !!adev
->wakeup
.prepare_count
)
956 sys_target
= acpi_target_system_state();
957 if (sys_target
== ACPI_STATE_S0
)
960 if (adev
->power
.flags
.dsw_present
)
963 ret
= acpi_dev_pm_get_state(dev
, adev
, sys_target
, NULL
, &state
);
964 return !ret
&& state
== adev
->power
.state
;
966 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
969 * acpi_subsys_suspend - Run the device driver's suspend callback.
970 * @dev: Device to handle.
972 * Follow PCI and resume devices suspended at run time before running their
973 * system suspend callbacks.
975 int acpi_subsys_suspend(struct device
*dev
)
977 pm_runtime_resume(dev
);
978 return pm_generic_suspend(dev
);
980 EXPORT_SYMBOL_GPL(acpi_subsys_suspend
);
983 * acpi_subsys_suspend_late - Suspend device using ACPI.
984 * @dev: Device to suspend.
986 * Carry out the generic late suspend procedure for @dev and use ACPI to put
987 * it into a low-power state during system transition into a sleep state.
989 int acpi_subsys_suspend_late(struct device
*dev
)
991 int ret
= pm_generic_suspend_late(dev
);
992 return ret
? ret
: acpi_dev_suspend_late(dev
);
994 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
997 * acpi_subsys_resume_early - Resume device using ACPI.
998 * @dev: Device to Resume.
1000 * Use ACPI to put the given device into the full-power state and carry out the
1001 * generic early resume procedure for it during system transition into the
1004 int acpi_subsys_resume_early(struct device
*dev
)
1006 int ret
= acpi_dev_resume_early(dev
);
1007 return ret
? ret
: pm_generic_resume_early(dev
);
1009 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
1012 * acpi_subsys_freeze - Run the device driver's freeze callback.
1013 * @dev: Device to handle.
1015 int acpi_subsys_freeze(struct device
*dev
)
1018 * This used to be done in acpi_subsys_prepare() for all devices and
1019 * some drivers may depend on it, so do it here. Ideally, however,
1020 * runtime-suspended devices should not be touched during freeze/thaw
1023 pm_runtime_resume(dev
);
1024 return pm_generic_freeze(dev
);
1026 EXPORT_SYMBOL_GPL(acpi_subsys_freeze
);
1028 #endif /* CONFIG_PM_SLEEP */
1030 static struct dev_pm_domain acpi_general_pm_domain
= {
1032 .runtime_suspend
= acpi_subsys_runtime_suspend
,
1033 .runtime_resume
= acpi_subsys_runtime_resume
,
1034 #ifdef CONFIG_PM_SLEEP
1035 .prepare
= acpi_subsys_prepare
,
1036 .complete
= pm_complete_with_resume_check
,
1037 .suspend
= acpi_subsys_suspend
,
1038 .suspend_late
= acpi_subsys_suspend_late
,
1039 .resume_early
= acpi_subsys_resume_early
,
1040 .freeze
= acpi_subsys_freeze
,
1041 .poweroff
= acpi_subsys_suspend
,
1042 .poweroff_late
= acpi_subsys_suspend_late
,
1043 .restore_early
= acpi_subsys_resume_early
,
1049 * acpi_dev_pm_detach - Remove ACPI power management from the device.
1050 * @dev: Device to take care of.
1051 * @power_off: Whether or not to try to remove power from the device.
1053 * Remove the device from the general ACPI PM domain and remove its wakeup
1054 * notifier. If @power_off is set, additionally remove power from the device if
1057 * Callers must ensure proper synchronization of this function with power
1058 * management callbacks.
1060 static void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
1062 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1064 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
1065 dev_pm_domain_set(dev
, NULL
);
1066 acpi_remove_pm_notifier(adev
);
1069 * If the device's PM QoS resume latency limit or flags
1070 * have been exposed to user space, they have to be
1071 * hidden at this point, so that they don't affect the
1072 * choice of the low-power state to put the device into.
1074 dev_pm_qos_hide_latency_limit(dev
);
1075 dev_pm_qos_hide_flags(dev
);
1076 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
1077 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
1083 * acpi_dev_pm_attach - Prepare device for ACPI power management.
1084 * @dev: Device to prepare.
1085 * @power_on: Whether or not to power on the device.
1087 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
1088 * attached to it, install a wakeup notification handler for the device and
1089 * add it to the general ACPI PM domain. If @power_on is set, the device will
1090 * be put into the ACPI D0 state before the function returns.
1092 * This assumes that the @dev's bus type uses generic power management callbacks
1093 * (or doesn't use any power management callbacks at all).
1095 * Callers must ensure proper synchronization of this function with power
1096 * management callbacks.
1098 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
1100 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1109 * Only attach the power domain to the first device if the
1110 * companion is shared by multiple. This is to prevent doing power
1113 if (!acpi_device_is_first_physical_node(adev
, dev
))
1116 acpi_add_pm_notifier(adev
, dev
, acpi_pm_notify_work_func
);
1117 dev_pm_domain_set(dev
, &acpi_general_pm_domain
);
1119 acpi_dev_pm_full_power(adev
);
1120 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
1123 dev
->pm_domain
->detach
= acpi_dev_pm_detach
;
1126 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
1127 #endif /* CONFIG_PM */