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/acpi.h>
26 #include <linux/export.h>
27 #include <linux/mutex.h>
28 #include <linux/pm_qos.h>
29 #include <linux/pm_runtime.h>
33 #define _COMPONENT ACPI_POWER_COMPONENT
34 ACPI_MODULE_NAME("device_pm");
37 * acpi_power_state_string - String representation of ACPI device power state.
38 * @state: ACPI device power state to return the string representation of.
40 const char *acpi_power_state_string(int state
)
49 case ACPI_STATE_D3_HOT
:
51 case ACPI_STATE_D3_COLD
:
59 * acpi_device_get_power - Get power state of an ACPI device.
60 * @device: Device to get the power state of.
61 * @state: Place to store the power state of the device.
63 * This function does not update the device's power.state field, but it may
64 * update its parent's power.state field (when the parent's power state is
65 * unknown and the device's power state turns out to be D0).
67 int acpi_device_get_power(struct acpi_device
*device
, int *state
)
69 int result
= ACPI_STATE_UNKNOWN
;
71 if (!device
|| !state
)
74 if (!device
->flags
.power_manageable
) {
75 /* TBD: Non-recursive algorithm for walking up hierarchy. */
76 *state
= device
->parent
?
77 device
->parent
->power
.state
: ACPI_STATE_D0
;
82 * Get the device's power state from power resources settings and _PSC,
85 if (device
->power
.flags
.power_resources
) {
86 int error
= acpi_power_get_inferred_state(device
, &result
);
90 if (device
->power
.flags
.explicit_get
) {
91 acpi_handle handle
= device
->handle
;
92 unsigned long long psc
;
95 status
= acpi_evaluate_integer(handle
, "_PSC", NULL
, &psc
);
96 if (ACPI_FAILURE(status
))
100 * The power resources settings may indicate a power state
101 * shallower than the actual power state of the device.
103 * Moreover, on systems predating ACPI 4.0, if the device
104 * doesn't depend on any power resources and _PSC returns 3,
105 * that means "power off". We need to maintain compatibility
106 * with those systems.
108 if (psc
> result
&& psc
< ACPI_STATE_D3_COLD
)
110 else if (result
== ACPI_STATE_UNKNOWN
)
111 result
= psc
> ACPI_STATE_D2
? ACPI_STATE_D3_COLD
: psc
;
115 * If we were unsure about the device parent's power state up to this
116 * point, the fact that the device is in D0 implies that the parent has
117 * to be in D0 too, except if ignore_parent is set.
119 if (!device
->power
.flags
.ignore_parent
&& device
->parent
120 && device
->parent
->power
.state
== ACPI_STATE_UNKNOWN
121 && result
== ACPI_STATE_D0
)
122 device
->parent
->power
.state
= ACPI_STATE_D0
;
127 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is %s\n",
128 device
->pnp
.bus_id
, acpi_power_state_string(*state
)));
133 static int acpi_dev_pm_explicit_set(struct acpi_device
*adev
, int state
)
135 if (adev
->power
.states
[state
].flags
.explicit_set
) {
136 char method
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
139 status
= acpi_evaluate_object(adev
->handle
, method
, NULL
, NULL
);
140 if (ACPI_FAILURE(status
))
147 * acpi_device_set_power - Set power state of an ACPI device.
148 * @device: Device to set the power state of.
149 * @state: New power state to set.
151 * Callers must ensure that the device is power manageable before using this
154 int acpi_device_set_power(struct acpi_device
*device
, int state
)
157 bool cut_power
= false;
159 if (!device
|| !device
->flags
.power_manageable
160 || (state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3_COLD
))
163 /* Make sure this is a valid target state */
165 if (state
== device
->power
.state
) {
166 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] already in %s\n",
168 acpi_power_state_string(state
)));
172 if (!device
->power
.states
[state
].flags
.valid
) {
173 dev_warn(&device
->dev
, "Power state %s not supported\n",
174 acpi_power_state_string(state
));
177 if (!device
->power
.flags
.ignore_parent
&&
178 device
->parent
&& (state
< device
->parent
->power
.state
)) {
179 dev_warn(&device
->dev
,
180 "Cannot transition to power state %s for parent in %s\n",
181 acpi_power_state_string(state
),
182 acpi_power_state_string(device
->parent
->power
.state
));
186 /* For D3cold we should first transition into D3hot. */
187 if (state
== ACPI_STATE_D3_COLD
188 && device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
) {
189 state
= ACPI_STATE_D3_HOT
;
193 if (state
< device
->power
.state
&& state
!= ACPI_STATE_D0
194 && device
->power
.state
>= ACPI_STATE_D3_HOT
) {
195 dev_warn(&device
->dev
,
196 "Cannot transition to non-D0 state from D3\n");
203 * In accordance with the ACPI specification first apply power (via
204 * power resources) and then evalute _PSx.
206 if (device
->power
.flags
.power_resources
) {
207 result
= acpi_power_transition(device
, state
);
211 result
= acpi_dev_pm_explicit_set(device
, state
);
216 device
->power
.state
= state
;
217 state
= ACPI_STATE_D3_COLD
;
218 result
= acpi_power_transition(device
, state
);
223 dev_warn(&device
->dev
, "Failed to change power state to %s\n",
224 acpi_power_state_string(state
));
226 device
->power
.state
= state
;
227 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
228 "Device [%s] transitioned to %s\n",
230 acpi_power_state_string(state
)));
235 EXPORT_SYMBOL(acpi_device_set_power
);
237 int acpi_bus_set_power(acpi_handle handle
, int state
)
239 struct acpi_device
*device
;
242 result
= acpi_bus_get_device(handle
, &device
);
246 return acpi_device_set_power(device
, state
);
248 EXPORT_SYMBOL(acpi_bus_set_power
);
250 int acpi_bus_init_power(struct acpi_device
*device
)
258 device
->power
.state
= ACPI_STATE_UNKNOWN
;
259 if (!acpi_device_is_present(device
))
262 result
= acpi_device_get_power(device
, &state
);
266 if (state
< ACPI_STATE_D3_COLD
&& device
->power
.flags
.power_resources
) {
267 result
= acpi_power_on_resources(device
, state
);
271 result
= acpi_dev_pm_explicit_set(device
, state
);
274 } else if (state
== ACPI_STATE_UNKNOWN
) {
276 * No power resources and missing _PSC? Cross fingers and make
277 * it D0 in hope that this is what the BIOS put the device into.
278 * [We tried to force D0 here by executing _PS0, but that broke
279 * Toshiba P870-303 in a nasty way.]
281 state
= ACPI_STATE_D0
;
283 device
->power
.state
= state
;
288 * acpi_device_fix_up_power - Force device with missing _PSC into D0.
289 * @device: Device object whose power state is to be fixed up.
291 * Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
292 * are assumed to be put into D0 by the BIOS. However, in some cases that may
293 * not be the case and this function should be used then.
295 int acpi_device_fix_up_power(struct acpi_device
*device
)
299 if (!device
->power
.flags
.power_resources
300 && !device
->power
.flags
.explicit_get
301 && device
->power
.state
== ACPI_STATE_D0
)
302 ret
= acpi_dev_pm_explicit_set(device
, ACPI_STATE_D0
);
307 int acpi_device_update_power(struct acpi_device
*device
, int *state_p
)
312 if (device
->power
.state
== ACPI_STATE_UNKNOWN
) {
313 result
= acpi_bus_init_power(device
);
314 if (!result
&& state_p
)
315 *state_p
= device
->power
.state
;
320 result
= acpi_device_get_power(device
, &state
);
324 if (state
== ACPI_STATE_UNKNOWN
) {
325 state
= ACPI_STATE_D0
;
326 result
= acpi_device_set_power(device
, state
);
330 if (device
->power
.flags
.power_resources
) {
332 * We don't need to really switch the state, bu we need
333 * to update the power resources' reference counters.
335 result
= acpi_power_transition(device
, state
);
339 device
->power
.state
= state
;
347 int acpi_bus_update_power(acpi_handle handle
, int *state_p
)
349 struct acpi_device
*device
;
352 result
= acpi_bus_get_device(handle
, &device
);
353 return result
? result
: acpi_device_update_power(device
, state_p
);
355 EXPORT_SYMBOL_GPL(acpi_bus_update_power
);
357 bool acpi_bus_power_manageable(acpi_handle handle
)
359 struct acpi_device
*device
;
362 result
= acpi_bus_get_device(handle
, &device
);
363 return result
? false : device
->flags
.power_manageable
;
365 EXPORT_SYMBOL(acpi_bus_power_manageable
);
368 static DEFINE_MUTEX(acpi_pm_notifier_lock
);
370 static void acpi_pm_notify_handler(acpi_handle handle
, u32 val
, void *not_used
)
372 struct acpi_device
*adev
;
374 if (val
!= ACPI_NOTIFY_DEVICE_WAKE
)
377 adev
= acpi_bus_get_acpi_device(handle
);
381 mutex_lock(&acpi_pm_notifier_lock
);
383 if (adev
->wakeup
.flags
.notifier_present
) {
384 __pm_wakeup_event(adev
->wakeup
.ws
, 0);
385 if (adev
->wakeup
.context
.work
.func
)
386 queue_pm_work(&adev
->wakeup
.context
.work
);
389 mutex_unlock(&acpi_pm_notifier_lock
);
391 acpi_bus_put_acpi_device(adev
);
395 * acpi_add_pm_notifier - Register PM notify handler for given ACPI device.
396 * @adev: ACPI device to add the notify handler for.
397 * @dev: Device to generate a wakeup event for while handling the notification.
398 * @work_func: Work function to execute when handling the notification.
400 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
401 * PM wakeup events. For example, wakeup events may be generated for bridges
402 * if one of the devices below the bridge is signaling wakeup, even if the
403 * bridge itself doesn't have a wakeup GPE associated with it.
405 acpi_status
acpi_add_pm_notifier(struct acpi_device
*adev
, struct device
*dev
,
406 void (*work_func
)(struct work_struct
*work
))
408 acpi_status status
= AE_ALREADY_EXISTS
;
410 if (!dev
&& !work_func
)
411 return AE_BAD_PARAMETER
;
413 mutex_lock(&acpi_pm_notifier_lock
);
415 if (adev
->wakeup
.flags
.notifier_present
)
418 adev
->wakeup
.ws
= wakeup_source_register(dev_name(&adev
->dev
));
419 adev
->wakeup
.context
.dev
= dev
;
421 INIT_WORK(&adev
->wakeup
.context
.work
, work_func
);
423 status
= acpi_install_notify_handler(adev
->handle
, ACPI_SYSTEM_NOTIFY
,
424 acpi_pm_notify_handler
, NULL
);
425 if (ACPI_FAILURE(status
))
428 adev
->wakeup
.flags
.notifier_present
= true;
431 mutex_unlock(&acpi_pm_notifier_lock
);
436 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
437 * @adev: ACPI device to remove the notifier from.
439 acpi_status
acpi_remove_pm_notifier(struct acpi_device
*adev
)
441 acpi_status status
= AE_BAD_PARAMETER
;
443 mutex_lock(&acpi_pm_notifier_lock
);
445 if (!adev
->wakeup
.flags
.notifier_present
)
448 status
= acpi_remove_notify_handler(adev
->handle
,
450 acpi_pm_notify_handler
);
451 if (ACPI_FAILURE(status
))
454 if (adev
->wakeup
.context
.work
.func
) {
455 cancel_work_sync(&adev
->wakeup
.context
.work
);
456 adev
->wakeup
.context
.work
.func
= NULL
;
458 adev
->wakeup
.context
.dev
= NULL
;
459 wakeup_source_unregister(adev
->wakeup
.ws
);
461 adev
->wakeup
.flags
.notifier_present
= false;
464 mutex_unlock(&acpi_pm_notifier_lock
);
468 bool acpi_bus_can_wakeup(acpi_handle handle
)
470 struct acpi_device
*device
;
473 result
= acpi_bus_get_device(handle
, &device
);
474 return result
? false : device
->wakeup
.flags
.valid
;
476 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
479 * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
480 * @dev: Device whose preferred target power state to return.
481 * @adev: ACPI device node corresponding to @dev.
482 * @target_state: System state to match the resultant device state.
483 * @d_min_p: Location to store the highest power state available to the device.
484 * @d_max_p: Location to store the lowest power state available to the device.
486 * Find the lowest power (highest number) and highest power (lowest number) ACPI
487 * device power states that the device can be in while the system is in the
488 * state represented by @target_state. Store the integer numbers representing
489 * those stats in the memory locations pointed to by @d_max_p and @d_min_p,
492 * Callers must ensure that @dev and @adev are valid pointers and that @adev
493 * actually corresponds to @dev before using this function.
495 * Returns 0 on success or -ENODATA when one of the ACPI methods fails or
496 * returns a value that doesn't make sense. The memory locations pointed to by
497 * @d_max_p and @d_min_p are only modified on success.
499 static int acpi_dev_pm_get_state(struct device
*dev
, struct acpi_device
*adev
,
500 u32 target_state
, int *d_min_p
, int *d_max_p
)
502 char method
[] = { '_', 'S', '0' + target_state
, 'D', '\0' };
503 acpi_handle handle
= adev
->handle
;
504 unsigned long long ret
;
510 * If the system state is S0, the lowest power state the device can be
511 * in is D3cold, unless the device has _S0W and is supposed to signal
512 * wakeup, in which case the return value of _S0W has to be used as the
513 * lowest power state available to the device.
515 d_min
= ACPI_STATE_D0
;
516 d_max
= ACPI_STATE_D3_COLD
;
519 * If present, _SxD methods return the minimum D-state (highest power
520 * state) we can use for the corresponding S-states. Otherwise, the
521 * minimum D-state is D0 (ACPI 3.x).
523 if (target_state
> ACPI_STATE_S0
) {
525 * We rely on acpi_evaluate_integer() not clobbering the integer
526 * provided if AE_NOT_FOUND is returned.
529 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
530 if ((ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
531 || ret
> ACPI_STATE_D3_COLD
)
535 * We need to handle legacy systems where D3hot and D3cold are
536 * the same and 3 is returned in both cases, so fall back to
537 * D3cold if D3hot is not a valid state.
539 if (!adev
->power
.states
[ret
].flags
.valid
) {
540 if (ret
== ACPI_STATE_D3_HOT
)
541 ret
= ACPI_STATE_D3_COLD
;
546 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
547 && adev
->wakeup
.sleep_state
>= target_state
;
548 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
550 wakeup
= adev
->wakeup
.flags
.valid
;
554 * If _PRW says we can wake up the system from the target sleep state,
555 * the D-state returned by _SxD is sufficient for that (we assume a
556 * wakeup-aware driver if wake is set). Still, if _SxW exists
557 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
558 * can wake the system. _S0W may be valid, too.
562 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
563 if (status
== AE_NOT_FOUND
) {
564 if (target_state
> ACPI_STATE_S0
)
566 } else if (ACPI_SUCCESS(status
) && ret
<= ACPI_STATE_D3_COLD
) {
567 /* Fall back to D3cold if ret is not a valid state. */
568 if (!adev
->power
.states
[ret
].flags
.valid
)
569 ret
= ACPI_STATE_D3_COLD
;
571 d_max
= ret
> d_min
? ret
: d_min
;
587 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
588 * @dev: Device whose preferred target power state to return.
589 * @d_min_p: Location to store the upper limit of the allowed states range.
590 * @d_max_in: Deepest low-power state to take into consideration.
591 * Return value: Preferred power state of the device on success, -ENODEV
592 * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
593 * incorrect, or -ENODATA on ACPI method failure.
595 * The caller must ensure that @dev is valid before using this function.
597 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
599 struct acpi_device
*adev
;
600 int ret
, d_min
, d_max
;
602 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3_COLD
)
605 if (d_max_in
> ACPI_STATE_D3_HOT
) {
606 enum pm_qos_flags_status stat
;
608 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
609 if (stat
== PM_QOS_FLAGS_ALL
)
610 d_max_in
= ACPI_STATE_D3_HOT
;
613 adev
= ACPI_COMPANION(dev
);
615 dev_dbg(dev
, "ACPI companion missing in %s!\n", __func__
);
619 ret
= acpi_dev_pm_get_state(dev
, adev
, acpi_target_system_state(),
624 if (d_max_in
< d_min
)
627 if (d_max
> d_max_in
) {
628 for (d_max
= d_max_in
; d_max
> d_min
; d_max
--) {
629 if (adev
->power
.states
[d_max
].flags
.valid
)
639 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
642 * acpi_pm_notify_work_func - ACPI devices wakeup notification work function.
643 * @work: Work item to handle.
645 static void acpi_pm_notify_work_func(struct work_struct
*work
)
649 dev
= container_of(work
, struct acpi_device_wakeup_context
, work
)->dev
;
651 pm_wakeup_event(dev
, 0);
652 pm_runtime_resume(dev
);
657 * acpi_device_wakeup - Enable/disable wakeup functionality for device.
658 * @adev: ACPI device to enable/disable wakeup functionality for.
659 * @target_state: State the system is transitioning into.
660 * @enable: Whether to enable or disable the wakeup functionality.
662 * Enable/disable the GPE associated with @adev so that it can generate
663 * wakeup signals for the device in response to external (remote) events and
664 * enable/disable device wakeup power.
666 * Callers must ensure that @adev is a valid ACPI device node before executing
669 static int acpi_device_wakeup(struct acpi_device
*adev
, u32 target_state
,
672 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
678 error
= acpi_enable_wakeup_device_power(adev
, target_state
);
682 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
683 if (ACPI_FAILURE(res
)) {
684 acpi_disable_wakeup_device_power(adev
);
688 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
689 acpi_disable_wakeup_device_power(adev
);
694 #ifdef CONFIG_PM_RUNTIME
696 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
697 * @dev: Device to enable/disable the platform to wake up.
698 * @enable: Whether to enable or disable the wakeup functionality.
700 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
702 struct acpi_device
*adev
;
704 if (!device_run_wake(phys_dev
))
707 adev
= ACPI_COMPANION(phys_dev
);
709 dev_dbg(phys_dev
, "ACPI companion missing in %s!\n", __func__
);
713 return acpi_device_wakeup(adev
, enable
, ACPI_STATE_S0
);
715 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
716 #endif /* CONFIG_PM_RUNTIME */
718 #ifdef CONFIG_PM_SLEEP
720 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
721 * @dev: Device to enable/desible to wake up the system from sleep states.
722 * @enable: Whether to enable or disable @dev to wake up the system.
724 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
726 struct acpi_device
*adev
;
729 if (!device_can_wakeup(dev
))
732 adev
= ACPI_COMPANION(dev
);
734 dev_dbg(dev
, "ACPI companion missing in %s!\n", __func__
);
738 error
= acpi_device_wakeup(adev
, acpi_target_system_state(), enable
);
740 dev_info(dev
, "System wakeup %s by ACPI\n",
741 enable
? "enabled" : "disabled");
745 #endif /* CONFIG_PM_SLEEP */
748 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
749 * @dev: Device to put into a low-power state.
750 * @adev: ACPI device node corresponding to @dev.
751 * @system_state: System state to choose the device state for.
753 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
758 if (!acpi_device_power_manageable(adev
))
761 ret
= acpi_dev_pm_get_state(dev
, adev
, system_state
, NULL
, &state
);
762 return ret
? ret
: acpi_device_set_power(adev
, state
);
766 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
767 * @adev: ACPI device node to put into the full-power state.
769 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
771 return acpi_device_power_manageable(adev
) ?
772 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
775 #ifdef CONFIG_PM_RUNTIME
777 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
778 * @dev: Device to put into a low-power state.
780 * Put the given device into a runtime low-power state using the standard ACPI
781 * mechanism. Set up remote wakeup if desired, choose the state to put the
782 * device into (this checks if remote wakeup is expected to work too), and set
783 * the power state of the device.
785 int acpi_dev_runtime_suspend(struct device
*dev
)
787 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
794 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
796 error
= acpi_device_wakeup(adev
, ACPI_STATE_S0
, remote_wakeup
);
797 if (remote_wakeup
&& error
)
800 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
802 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
806 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
809 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
810 * @dev: Device to put into the full-power state.
812 * Put the given device into the full-power state using the standard ACPI
813 * mechanism at run time. Set the power state of the device to ACPI D0 and
814 * disable remote wakeup.
816 int acpi_dev_runtime_resume(struct device
*dev
)
818 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
824 error
= acpi_dev_pm_full_power(adev
);
825 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
828 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
831 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
832 * @dev: Device to suspend.
834 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
835 * it into a runtime low-power state.
837 int acpi_subsys_runtime_suspend(struct device
*dev
)
839 int ret
= pm_generic_runtime_suspend(dev
);
840 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
842 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
845 * acpi_subsys_runtime_resume - Resume device using ACPI.
846 * @dev: Device to Resume.
848 * Use ACPI to put the given device into the full-power state and carry out the
849 * generic runtime resume procedure for it.
851 int acpi_subsys_runtime_resume(struct device
*dev
)
853 int ret
= acpi_dev_runtime_resume(dev
);
854 return ret
? ret
: pm_generic_runtime_resume(dev
);
856 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
857 #endif /* CONFIG_PM_RUNTIME */
859 #ifdef CONFIG_PM_SLEEP
861 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
862 * @dev: Device to put into a low-power state.
864 * Put the given device into a low-power state during system transition to a
865 * sleep state using the standard ACPI mechanism. Set up system wakeup if
866 * desired, choose the state to put the device into (this checks if system
867 * wakeup is expected to work too), and set the power state of the device.
869 int acpi_dev_suspend_late(struct device
*dev
)
871 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
879 target_state
= acpi_target_system_state();
880 wakeup
= device_may_wakeup(dev
);
881 error
= acpi_device_wakeup(adev
, target_state
, wakeup
);
885 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
887 acpi_device_wakeup(adev
, ACPI_STATE_UNKNOWN
, false);
891 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
894 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
895 * @dev: Device to put into the full-power state.
897 * Put the given device into the full-power state using the standard ACPI
898 * mechanism during system transition to the working state. Set the power
899 * state of the device to ACPI D0 and disable remote wakeup.
901 int acpi_dev_resume_early(struct device
*dev
)
903 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
909 error
= acpi_dev_pm_full_power(adev
);
910 acpi_device_wakeup(adev
, ACPI_STATE_UNKNOWN
, false);
913 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
916 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
917 * @dev: Device to prepare.
919 int acpi_subsys_prepare(struct device
*dev
)
921 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
925 ret
= pm_generic_prepare(dev
);
929 if (!adev
|| !pm_runtime_suspended(dev
)
930 || device_may_wakeup(dev
) != !!adev
->wakeup
.prepare_count
)
933 sys_target
= acpi_target_system_state();
934 if (sys_target
== ACPI_STATE_S0
)
937 if (adev
->power
.flags
.dsw_present
)
940 ret
= acpi_dev_pm_get_state(dev
, adev
, sys_target
, NULL
, &state
);
941 return !ret
&& state
== adev
->power
.state
;
943 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
946 * acpi_subsys_complete - Finalize device's resume during system resume.
947 * @dev: Device to handle.
949 void acpi_subsys_complete(struct device
*dev
)
952 * If the device had been runtime-suspended before the system went into
953 * the sleep state it is going out of and it has never been resumed till
954 * now, resume it in case the firmware powered it up.
956 if (dev
->power
.direct_complete
)
957 pm_request_resume(dev
);
959 EXPORT_SYMBOL_GPL(acpi_subsys_complete
);
962 * acpi_subsys_suspend - Run the device driver's suspend callback.
963 * @dev: Device to handle.
965 * Follow PCI and resume devices suspended at run time before running their
966 * system suspend callbacks.
968 int acpi_subsys_suspend(struct device
*dev
)
970 pm_runtime_resume(dev
);
971 return pm_generic_suspend(dev
);
973 EXPORT_SYMBOL_GPL(acpi_subsys_suspend
);
976 * acpi_subsys_suspend_late - Suspend device using ACPI.
977 * @dev: Device to suspend.
979 * Carry out the generic late suspend procedure for @dev and use ACPI to put
980 * it into a low-power state during system transition into a sleep state.
982 int acpi_subsys_suspend_late(struct device
*dev
)
984 int ret
= pm_generic_suspend_late(dev
);
985 return ret
? ret
: acpi_dev_suspend_late(dev
);
987 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
990 * acpi_subsys_resume_early - Resume device using ACPI.
991 * @dev: Device to Resume.
993 * Use ACPI to put the given device into the full-power state and carry out the
994 * generic early resume procedure for it during system transition into the
997 int acpi_subsys_resume_early(struct device
*dev
)
999 int ret
= acpi_dev_resume_early(dev
);
1000 return ret
? ret
: pm_generic_resume_early(dev
);
1002 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
1005 * acpi_subsys_freeze - Run the device driver's freeze callback.
1006 * @dev: Device to handle.
1008 int acpi_subsys_freeze(struct device
*dev
)
1011 * This used to be done in acpi_subsys_prepare() for all devices and
1012 * some drivers may depend on it, so do it here. Ideally, however,
1013 * runtime-suspended devices should not be touched during freeze/thaw
1016 pm_runtime_resume(dev
);
1017 return pm_generic_freeze(dev
);
1019 EXPORT_SYMBOL_GPL(acpi_subsys_freeze
);
1021 #endif /* CONFIG_PM_SLEEP */
1023 static struct dev_pm_domain acpi_general_pm_domain
= {
1025 #ifdef CONFIG_PM_RUNTIME
1026 .runtime_suspend
= acpi_subsys_runtime_suspend
,
1027 .runtime_resume
= acpi_subsys_runtime_resume
,
1029 #ifdef CONFIG_PM_SLEEP
1030 .prepare
= acpi_subsys_prepare
,
1031 .complete
= acpi_subsys_complete
,
1032 .suspend
= acpi_subsys_suspend
,
1033 .suspend_late
= acpi_subsys_suspend_late
,
1034 .resume_early
= acpi_subsys_resume_early
,
1035 .freeze
= acpi_subsys_freeze
,
1036 .poweroff
= acpi_subsys_suspend
,
1037 .poweroff_late
= acpi_subsys_suspend_late
,
1038 .restore_early
= acpi_subsys_resume_early
,
1044 * acpi_dev_pm_detach - Remove ACPI power management from the device.
1045 * @dev: Device to take care of.
1046 * @power_off: Whether or not to try to remove power from the device.
1048 * Remove the device from the general ACPI PM domain and remove its wakeup
1049 * notifier. If @power_off is set, additionally remove power from the device if
1052 * Callers must ensure proper synchronization of this function with power
1053 * management callbacks.
1055 static void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
1057 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1059 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
1060 dev
->pm_domain
= NULL
;
1061 acpi_remove_pm_notifier(adev
);
1064 * If the device's PM QoS resume latency limit or flags
1065 * have been exposed to user space, they have to be
1066 * hidden at this point, so that they don't affect the
1067 * choice of the low-power state to put the device into.
1069 dev_pm_qos_hide_latency_limit(dev
);
1070 dev_pm_qos_hide_flags(dev
);
1071 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
1072 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
1078 * acpi_dev_pm_attach - Prepare device for ACPI power management.
1079 * @dev: Device to prepare.
1080 * @power_on: Whether or not to power on the device.
1082 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
1083 * attached to it, install a wakeup notification handler for the device and
1084 * add it to the general ACPI PM domain. If @power_on is set, the device will
1085 * be put into the ACPI D0 state before the function returns.
1087 * This assumes that the @dev's bus type uses generic power management callbacks
1088 * (or doesn't use any power management callbacks at all).
1090 * Callers must ensure proper synchronization of this function with power
1091 * management callbacks.
1093 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
1095 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
1103 acpi_add_pm_notifier(adev
, dev
, acpi_pm_notify_work_func
);
1104 dev
->pm_domain
= &acpi_general_pm_domain
;
1106 acpi_dev_pm_full_power(adev
);
1107 acpi_device_wakeup(adev
, ACPI_STATE_S0
, false);
1110 dev
->pm_domain
->detach
= acpi_dev_pm_detach
;
1113 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
1114 #endif /* CONFIG_PM */