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
) {
282 * No power resources and missing _PSC? Cross fingers and make
283 * it D0 in hope that this is what the BIOS put the device into.
284 * [We tried to force D0 here by executing _PS0, but that broke
285 * Toshiba P870-303 in a nasty way.]
287 state
= ACPI_STATE_D0
;
289 device
->power
.state
= state
;
293 int acpi_bus_update_power(acpi_handle handle
, int *state_p
)
295 struct acpi_device
*device
;
299 result
= acpi_bus_get_device(handle
, &device
);
303 result
= acpi_device_get_power(device
, &state
);
307 if (state
== ACPI_STATE_UNKNOWN
)
308 state
= ACPI_STATE_D0
;
310 result
= acpi_device_set_power(device
, state
);
311 if (!result
&& state_p
)
316 EXPORT_SYMBOL_GPL(acpi_bus_update_power
);
318 bool acpi_bus_power_manageable(acpi_handle handle
)
320 struct acpi_device
*device
;
323 result
= acpi_bus_get_device(handle
, &device
);
324 return result
? false : device
->flags
.power_manageable
;
326 EXPORT_SYMBOL(acpi_bus_power_manageable
);
329 static DEFINE_MUTEX(acpi_pm_notifier_lock
);
332 * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
333 * @adev: ACPI device to add the notifier for.
334 * @context: Context information to pass to the notifier routine.
336 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
337 * PM wakeup events. For example, wakeup events may be generated for bridges
338 * if one of the devices below the bridge is signaling wakeup, even if the
339 * bridge itself doesn't have a wakeup GPE associated with it.
341 acpi_status
acpi_add_pm_notifier(struct acpi_device
*adev
,
342 acpi_notify_handler handler
, void *context
)
344 acpi_status status
= AE_ALREADY_EXISTS
;
346 mutex_lock(&acpi_pm_notifier_lock
);
348 if (adev
->wakeup
.flags
.notifier_present
)
351 status
= acpi_install_notify_handler(adev
->handle
,
354 if (ACPI_FAILURE(status
))
357 adev
->wakeup
.flags
.notifier_present
= true;
360 mutex_unlock(&acpi_pm_notifier_lock
);
365 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
366 * @adev: ACPI device to remove the notifier from.
368 acpi_status
acpi_remove_pm_notifier(struct acpi_device
*adev
,
369 acpi_notify_handler handler
)
371 acpi_status status
= AE_BAD_PARAMETER
;
373 mutex_lock(&acpi_pm_notifier_lock
);
375 if (!adev
->wakeup
.flags
.notifier_present
)
378 status
= acpi_remove_notify_handler(adev
->handle
,
381 if (ACPI_FAILURE(status
))
384 adev
->wakeup
.flags
.notifier_present
= false;
387 mutex_unlock(&acpi_pm_notifier_lock
);
391 bool acpi_bus_can_wakeup(acpi_handle handle
)
393 struct acpi_device
*device
;
396 result
= acpi_bus_get_device(handle
, &device
);
397 return result
? false : device
->wakeup
.flags
.valid
;
399 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
402 * acpi_dev_pm_get_state - Get preferred power state of ACPI device.
403 * @dev: Device whose preferred target power state to return.
404 * @adev: ACPI device node corresponding to @dev.
405 * @target_state: System state to match the resultant device state.
406 * @d_min_p: Location to store the highest power state available to the device.
407 * @d_max_p: Location to store the lowest power state available to the device.
409 * Find the lowest power (highest number) and highest power (lowest number) ACPI
410 * device power states that the device can be in while the system is in the
411 * state represented by @target_state. Store the integer numbers representing
412 * those stats in the memory locations pointed to by @d_max_p and @d_min_p,
415 * Callers must ensure that @dev and @adev are valid pointers and that @adev
416 * actually corresponds to @dev before using this function.
418 * Returns 0 on success or -ENODATA when one of the ACPI methods fails or
419 * returns a value that doesn't make sense. The memory locations pointed to by
420 * @d_max_p and @d_min_p are only modified on success.
422 static int acpi_dev_pm_get_state(struct device
*dev
, struct acpi_device
*adev
,
423 u32 target_state
, int *d_min_p
, int *d_max_p
)
425 char method
[] = { '_', 'S', '0' + target_state
, 'D', '\0' };
426 acpi_handle handle
= adev
->handle
;
427 unsigned long long ret
;
433 * If the system state is S0, the lowest power state the device can be
434 * in is D3cold, unless the device has _S0W and is supposed to signal
435 * wakeup, in which case the return value of _S0W has to be used as the
436 * lowest power state available to the device.
438 d_min
= ACPI_STATE_D0
;
439 d_max
= ACPI_STATE_D3_COLD
;
442 * If present, _SxD methods return the minimum D-state (highest power
443 * state) we can use for the corresponding S-states. Otherwise, the
444 * minimum D-state is D0 (ACPI 3.x).
446 if (target_state
> ACPI_STATE_S0
) {
448 * We rely on acpi_evaluate_integer() not clobbering the integer
449 * provided if AE_NOT_FOUND is returned.
452 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
453 if ((ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
)
454 || ret
> ACPI_STATE_D3_COLD
)
458 * We need to handle legacy systems where D3hot and D3cold are
459 * the same and 3 is returned in both cases, so fall back to
460 * D3cold if D3hot is not a valid state.
462 if (!adev
->power
.states
[ret
].flags
.valid
) {
463 if (ret
== ACPI_STATE_D3_HOT
)
464 ret
= ACPI_STATE_D3_COLD
;
469 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
470 && adev
->wakeup
.sleep_state
>= target_state
;
471 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
473 wakeup
= adev
->wakeup
.flags
.valid
;
477 * If _PRW says we can wake up the system from the target sleep state,
478 * the D-state returned by _SxD is sufficient for that (we assume a
479 * wakeup-aware driver if wake is set). Still, if _SxW exists
480 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
481 * can wake the system. _S0W may be valid, too.
485 status
= acpi_evaluate_integer(handle
, method
, NULL
, &ret
);
486 if (status
== AE_NOT_FOUND
) {
487 if (target_state
> ACPI_STATE_S0
)
489 } else if (ACPI_SUCCESS(status
) && ret
<= ACPI_STATE_D3_COLD
) {
490 /* Fall back to D3cold if ret is not a valid state. */
491 if (!adev
->power
.states
[ret
].flags
.valid
)
492 ret
= ACPI_STATE_D3_COLD
;
494 d_max
= ret
> d_min
? ret
: d_min
;
510 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
511 * @dev: Device whose preferred target power state to return.
512 * @d_min_p: Location to store the upper limit of the allowed states range.
513 * @d_max_in: Deepest low-power state to take into consideration.
514 * Return value: Preferred power state of the device on success, -ENODEV
515 * if there's no 'struct acpi_device' for @dev, -EINVAL if @d_max_in is
516 * incorrect, or -ENODATA on ACPI method failure.
518 * The caller must ensure that @dev is valid before using this function.
520 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
522 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
523 struct acpi_device
*adev
;
526 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3_COLD
)
529 if (d_max_in
> ACPI_STATE_D3_HOT
) {
530 enum pm_qos_flags_status stat
;
532 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
533 if (stat
== PM_QOS_FLAGS_ALL
)
534 d_max_in
= ACPI_STATE_D3_HOT
;
537 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
538 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
542 ret
= acpi_dev_pm_get_state(dev
, adev
, acpi_target_system_state(),
547 if (d_max_in
< *d_min_p
)
550 if (d_max
> d_max_in
) {
551 for (d_max
= d_max_in
; d_max
> *d_min_p
; d_max
--) {
552 if (adev
->power
.states
[d_max
].flags
.valid
)
558 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
560 #ifdef CONFIG_PM_RUNTIME
562 * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
563 * @handle: ACPI handle of the device the notification is for.
564 * @event: Type of the signaled event.
565 * @context: Device corresponding to @handle.
567 static void acpi_wakeup_device(acpi_handle handle
, u32 event
, void *context
)
569 struct device
*dev
= context
;
571 if (event
== ACPI_NOTIFY_DEVICE_WAKE
&& dev
) {
572 pm_wakeup_event(dev
, 0);
573 pm_runtime_resume(dev
);
578 * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
579 * @adev: ACPI device to enable/disable the remote wakeup for.
580 * @enable: Whether to enable or disable the wakeup functionality.
582 * Enable/disable the GPE associated with @adev so that it can generate
583 * wakeup signals for the device in response to external (remote) events and
584 * enable/disable device wakeup power.
586 * Callers must ensure that @adev is a valid ACPI device node before executing
589 int __acpi_device_run_wake(struct acpi_device
*adev
, bool enable
)
591 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
597 error
= acpi_enable_wakeup_device_power(adev
, ACPI_STATE_S0
);
601 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
602 if (ACPI_FAILURE(res
)) {
603 acpi_disable_wakeup_device_power(adev
);
607 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
608 acpi_disable_wakeup_device_power(adev
);
614 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
615 * @dev: Device to enable/disable the platform to wake up.
616 * @enable: Whether to enable or disable the wakeup functionality.
618 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
620 struct acpi_device
*adev
;
623 if (!device_run_wake(phys_dev
))
626 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
627 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
628 dev_dbg(phys_dev
, "ACPI handle without context in %s!\n",
633 return __acpi_device_run_wake(adev
, enable
);
635 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
637 static inline void acpi_wakeup_device(acpi_handle handle
, u32 event
,
639 #endif /* CONFIG_PM_RUNTIME */
641 #ifdef CONFIG_PM_SLEEP
643 * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
644 * @dev: Device to enable/desible to wake up the system.
645 * @target_state: System state the device is supposed to wake up from.
646 * @enable: Whether to enable or disable @dev to wake up the system.
648 int __acpi_device_sleep_wake(struct acpi_device
*adev
, u32 target_state
,
652 acpi_enable_wakeup_device_power(adev
, target_state
) :
653 acpi_disable_wakeup_device_power(adev
);
657 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
658 * @dev: Device to enable/desible to wake up the system from sleep states.
659 * @enable: Whether to enable or disable @dev to wake up the system.
661 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
664 struct acpi_device
*adev
;
667 if (!device_can_wakeup(dev
))
670 handle
= DEVICE_ACPI_HANDLE(dev
);
671 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
672 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
676 error
= __acpi_device_sleep_wake(adev
, acpi_target_system_state(),
679 dev_info(dev
, "System wakeup %s by ACPI\n",
680 enable
? "enabled" : "disabled");
684 #endif /* CONFIG_PM_SLEEP */
687 * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
688 * @dev: Device to get the ACPI node for.
690 struct acpi_device
*acpi_dev_pm_get_node(struct device
*dev
)
692 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
693 struct acpi_device
*adev
;
695 return handle
&& !acpi_bus_get_device(handle
, &adev
) ? adev
: NULL
;
699 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
700 * @dev: Device to put into a low-power state.
701 * @adev: ACPI device node corresponding to @dev.
702 * @system_state: System state to choose the device state for.
704 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
709 if (!acpi_device_power_manageable(adev
))
712 ret
= acpi_dev_pm_get_state(dev
, adev
, system_state
, NULL
, &state
);
713 return ret
? ret
: acpi_device_set_power(adev
, state
);
717 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
718 * @adev: ACPI device node to put into the full-power state.
720 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
722 return acpi_device_power_manageable(adev
) ?
723 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
726 #ifdef CONFIG_PM_RUNTIME
728 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
729 * @dev: Device to put into a low-power state.
731 * Put the given device into a runtime low-power state using the standard ACPI
732 * mechanism. Set up remote wakeup if desired, choose the state to put the
733 * device into (this checks if remote wakeup is expected to work too), and set
734 * the power state of the device.
736 int acpi_dev_runtime_suspend(struct device
*dev
)
738 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
745 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
747 error
= __acpi_device_run_wake(adev
, remote_wakeup
);
748 if (remote_wakeup
&& error
)
751 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
753 __acpi_device_run_wake(adev
, false);
757 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
760 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
761 * @dev: Device to put into the full-power state.
763 * Put the given device into the full-power state using the standard ACPI
764 * mechanism at run time. Set the power state of the device to ACPI D0 and
765 * disable remote wakeup.
767 int acpi_dev_runtime_resume(struct device
*dev
)
769 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
775 error
= acpi_dev_pm_full_power(adev
);
776 __acpi_device_run_wake(adev
, false);
779 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
782 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
783 * @dev: Device to suspend.
785 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
786 * it into a runtime low-power state.
788 int acpi_subsys_runtime_suspend(struct device
*dev
)
790 int ret
= pm_generic_runtime_suspend(dev
);
791 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
793 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
796 * acpi_subsys_runtime_resume - Resume device using ACPI.
797 * @dev: Device to Resume.
799 * Use ACPI to put the given device into the full-power state and carry out the
800 * generic runtime resume procedure for it.
802 int acpi_subsys_runtime_resume(struct device
*dev
)
804 int ret
= acpi_dev_runtime_resume(dev
);
805 return ret
? ret
: pm_generic_runtime_resume(dev
);
807 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
808 #endif /* CONFIG_PM_RUNTIME */
810 #ifdef CONFIG_PM_SLEEP
812 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
813 * @dev: Device to put into a low-power state.
815 * Put the given device into a low-power state during system transition to a
816 * sleep state using the standard ACPI mechanism. Set up system wakeup if
817 * desired, choose the state to put the device into (this checks if system
818 * wakeup is expected to work too), and set the power state of the device.
820 int acpi_dev_suspend_late(struct device
*dev
)
822 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
830 target_state
= acpi_target_system_state();
831 wakeup
= device_may_wakeup(dev
);
832 error
= __acpi_device_sleep_wake(adev
, target_state
, wakeup
);
836 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
838 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
842 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
845 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
846 * @dev: Device to put into the full-power state.
848 * Put the given device into the full-power state using the standard ACPI
849 * mechanism during system transition to the working state. Set the power
850 * state of the device to ACPI D0 and disable remote wakeup.
852 int acpi_dev_resume_early(struct device
*dev
)
854 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
860 error
= acpi_dev_pm_full_power(adev
);
861 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
864 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
867 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
868 * @dev: Device to prepare.
870 int acpi_subsys_prepare(struct device
*dev
)
873 * Follow PCI and resume devices suspended at run time before running
874 * their system suspend callbacks.
876 pm_runtime_resume(dev
);
877 return pm_generic_prepare(dev
);
879 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
882 * acpi_subsys_suspend_late - Suspend device using ACPI.
883 * @dev: Device to suspend.
885 * Carry out the generic late suspend procedure for @dev and use ACPI to put
886 * it into a low-power state during system transition into a sleep state.
888 int acpi_subsys_suspend_late(struct device
*dev
)
890 int ret
= pm_generic_suspend_late(dev
);
891 return ret
? ret
: acpi_dev_suspend_late(dev
);
893 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
896 * acpi_subsys_resume_early - Resume device using ACPI.
897 * @dev: Device to Resume.
899 * Use ACPI to put the given device into the full-power state and carry out the
900 * generic early resume procedure for it during system transition into the
903 int acpi_subsys_resume_early(struct device
*dev
)
905 int ret
= acpi_dev_resume_early(dev
);
906 return ret
? ret
: pm_generic_resume_early(dev
);
908 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
909 #endif /* CONFIG_PM_SLEEP */
911 static struct dev_pm_domain acpi_general_pm_domain
= {
913 #ifdef CONFIG_PM_RUNTIME
914 .runtime_suspend
= acpi_subsys_runtime_suspend
,
915 .runtime_resume
= acpi_subsys_runtime_resume
,
916 .runtime_idle
= pm_generic_runtime_idle
,
918 #ifdef CONFIG_PM_SLEEP
919 .prepare
= acpi_subsys_prepare
,
920 .suspend_late
= acpi_subsys_suspend_late
,
921 .resume_early
= acpi_subsys_resume_early
,
922 .poweroff_late
= acpi_subsys_suspend_late
,
923 .restore_early
= acpi_subsys_resume_early
,
929 * acpi_dev_pm_attach - Prepare device for ACPI power management.
930 * @dev: Device to prepare.
931 * @power_on: Whether or not to power on the device.
933 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
934 * attached to it, install a wakeup notification handler for the device and
935 * add it to the general ACPI PM domain. If @power_on is set, the device will
936 * be put into the ACPI D0 state before the function returns.
938 * This assumes that the @dev's bus type uses generic power management callbacks
939 * (or doesn't use any power management callbacks at all).
941 * Callers must ensure proper synchronization of this function with power
942 * management callbacks.
944 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
946 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
954 acpi_add_pm_notifier(adev
, acpi_wakeup_device
, dev
);
955 dev
->pm_domain
= &acpi_general_pm_domain
;
957 acpi_dev_pm_full_power(adev
);
958 __acpi_device_run_wake(adev
, false);
962 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
965 * acpi_dev_pm_detach - Remove ACPI power management from the device.
966 * @dev: Device to take care of.
967 * @power_off: Whether or not to try to remove power from the device.
969 * Remove the device from the general ACPI PM domain and remove its wakeup
970 * notifier. If @power_off is set, additionally remove power from the device if
973 * Callers must ensure proper synchronization of this function with power
974 * management callbacks.
976 void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
978 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
980 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
981 dev
->pm_domain
= NULL
;
982 acpi_remove_pm_notifier(adev
, acpi_wakeup_device
);
985 * If the device's PM QoS resume latency limit or flags
986 * have been exposed to user space, they have to be
987 * hidden at this point, so that they don't affect the
988 * choice of the low-power state to put the device into.
990 dev_pm_qos_hide_latency_limit(dev
);
991 dev_pm_qos_hide_flags(dev
);
992 __acpi_device_run_wake(adev
, false);
993 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
997 EXPORT_SYMBOL_GPL(acpi_dev_pm_detach
);
1000 * acpi_dev_pm_add_dependent - Add physical device depending for PM.
1001 * @handle: Handle of ACPI device node.
1002 * @depdev: Device depending on that node for PM.
1004 void acpi_dev_pm_add_dependent(acpi_handle handle
, struct device
*depdev
)
1006 struct acpi_device_physical_node
*dep
;
1007 struct acpi_device
*adev
;
1009 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
1012 mutex_lock(&adev
->physical_node_lock
);
1014 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
1015 if (dep
->dev
== depdev
)
1018 dep
= kzalloc(sizeof(*dep
), GFP_KERNEL
);
1021 list_add_tail(&dep
->node
, &adev
->power_dependent
);
1025 mutex_unlock(&adev
->physical_node_lock
);
1027 EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent
);
1030 * acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
1031 * @handle: Handle of ACPI device node.
1032 * @depdev: Device depending on that node for PM.
1034 void acpi_dev_pm_remove_dependent(acpi_handle handle
, struct device
*depdev
)
1036 struct acpi_device_physical_node
*dep
;
1037 struct acpi_device
*adev
;
1039 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
1042 mutex_lock(&adev
->physical_node_lock
);
1044 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
1045 if (dep
->dev
== depdev
) {
1046 list_del(&dep
->node
);
1051 mutex_unlock(&adev
->physical_node_lock
);
1053 EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent
);
1054 #endif /* CONFIG_PM */