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_device_power_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_max_in: Deepest low-power state to take into consideration.
407 * @d_min_p: Location to store the upper limit of the allowed states range.
408 * Return value: Preferred power state of the device on success, -ENODEV
409 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
411 * Find the lowest power (highest number) ACPI device power state that the
412 * device can be in while the system is in the state represented by
413 * @target_state. If @d_min_p is set, the highest power (lowest number) device
414 * power state that @dev can be in for the given system sleep state is stored
415 * at the location pointed to by it.
417 * Callers must ensure that @dev and @adev are valid pointers and that @adev
418 * actually corresponds to @dev before using this function.
420 int acpi_device_power_state(struct device
*dev
, struct acpi_device
*adev
,
421 u32 target_state
, int d_max_in
, int *d_min_p
)
423 char acpi_method
[] = "_SxD";
424 unsigned long long d_min
, d_max
;
427 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3
)
430 if (d_max_in
> ACPI_STATE_D3_HOT
) {
431 enum pm_qos_flags_status stat
;
433 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
434 if (stat
== PM_QOS_FLAGS_ALL
)
435 d_max_in
= ACPI_STATE_D3_HOT
;
438 acpi_method
[2] = '0' + target_state
;
440 * If the sleep state is S0, the lowest limit from ACPI is D3,
441 * but if the device has _S0W, we will use the value from _S0W
442 * as the lowest limit from ACPI. Finally, we will constrain
443 * the lowest limit with the specified one.
445 d_min
= ACPI_STATE_D0
;
446 d_max
= ACPI_STATE_D3
;
449 * If present, _SxD methods return the minimum D-state (highest power
450 * state) we can use for the corresponding S-states. Otherwise, the
451 * minimum D-state is D0 (ACPI 3.x).
453 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
454 * provided -- that's our fault recovery, we ignore retval.
456 if (target_state
> ACPI_STATE_S0
) {
457 acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
, &d_min
);
458 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
459 && adev
->wakeup
.sleep_state
>= target_state
;
460 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
462 wakeup
= adev
->wakeup
.flags
.valid
;
466 * If _PRW says we can wake up the system from the target sleep state,
467 * the D-state returned by _SxD is sufficient for that (we assume a
468 * wakeup-aware driver if wake is set). Still, if _SxW exists
469 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
470 * can wake the system. _S0W may be valid, too.
475 acpi_method
[3] = 'W';
476 status
= acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
,
478 if (ACPI_FAILURE(status
)) {
479 if (target_state
!= ACPI_STATE_S0
||
480 status
!= AE_NOT_FOUND
)
482 } else if (d_max
< d_min
) {
483 /* Warn the user of the broken DSDT */
484 printk(KERN_WARNING
"ACPI: Wrong value from %s\n",
491 if (d_max_in
< d_min
)
495 /* constrain d_max with specified lowest limit (max number) */
496 if (d_max
> d_max_in
) {
497 for (d_max
= d_max_in
; d_max
> d_min
; d_max
--) {
498 if (adev
->power
.states
[d_max
].flags
.valid
)
504 EXPORT_SYMBOL_GPL(acpi_device_power_state
);
507 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
508 * @dev: Device whose preferred target power state to return.
509 * @d_min_p: Location to store the upper limit of the allowed states range.
510 * @d_max_in: Deepest low-power state to take into consideration.
511 * Return value: Preferred power state of the device on success, -ENODEV
512 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
514 * The caller must ensure that @dev is valid before using this function.
516 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
518 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
519 struct acpi_device
*adev
;
521 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
522 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
526 return acpi_device_power_state(dev
, adev
, acpi_target_system_state(),
529 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
531 #ifdef CONFIG_PM_RUNTIME
533 * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
534 * @handle: ACPI handle of the device the notification is for.
535 * @event: Type of the signaled event.
536 * @context: Device corresponding to @handle.
538 static void acpi_wakeup_device(acpi_handle handle
, u32 event
, void *context
)
540 struct device
*dev
= context
;
542 if (event
== ACPI_NOTIFY_DEVICE_WAKE
&& dev
) {
543 pm_wakeup_event(dev
, 0);
544 pm_runtime_resume(dev
);
549 * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
550 * @adev: ACPI device to enable/disable the remote wakeup for.
551 * @enable: Whether to enable or disable the wakeup functionality.
553 * Enable/disable the GPE associated with @adev so that it can generate
554 * wakeup signals for the device in response to external (remote) events and
555 * enable/disable device wakeup power.
557 * Callers must ensure that @adev is a valid ACPI device node before executing
560 int __acpi_device_run_wake(struct acpi_device
*adev
, bool enable
)
562 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
568 error
= acpi_enable_wakeup_device_power(adev
, ACPI_STATE_S0
);
572 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
573 if (ACPI_FAILURE(res
)) {
574 acpi_disable_wakeup_device_power(adev
);
578 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
579 acpi_disable_wakeup_device_power(adev
);
585 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
586 * @dev: Device to enable/disable the platform to wake up.
587 * @enable: Whether to enable or disable the wakeup functionality.
589 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
591 struct acpi_device
*adev
;
594 if (!device_run_wake(phys_dev
))
597 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
598 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
599 dev_dbg(phys_dev
, "ACPI handle without context in %s!\n",
604 return __acpi_device_run_wake(adev
, enable
);
606 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
608 static inline void acpi_wakeup_device(acpi_handle handle
, u32 event
,
610 #endif /* CONFIG_PM_RUNTIME */
612 #ifdef CONFIG_PM_SLEEP
614 * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
615 * @dev: Device to enable/desible to wake up the system.
616 * @target_state: System state the device is supposed to wake up from.
617 * @enable: Whether to enable or disable @dev to wake up the system.
619 int __acpi_device_sleep_wake(struct acpi_device
*adev
, u32 target_state
,
623 acpi_enable_wakeup_device_power(adev
, target_state
) :
624 acpi_disable_wakeup_device_power(adev
);
628 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
629 * @dev: Device to enable/desible to wake up the system from sleep states.
630 * @enable: Whether to enable or disable @dev to wake up the system.
632 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
635 struct acpi_device
*adev
;
638 if (!device_can_wakeup(dev
))
641 handle
= DEVICE_ACPI_HANDLE(dev
);
642 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
643 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
647 error
= __acpi_device_sleep_wake(adev
, acpi_target_system_state(),
650 dev_info(dev
, "System wakeup %s by ACPI\n",
651 enable
? "enabled" : "disabled");
655 #endif /* CONFIG_PM_SLEEP */
658 * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
659 * @dev: Device to get the ACPI node for.
661 struct acpi_device
*acpi_dev_pm_get_node(struct device
*dev
)
663 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
664 struct acpi_device
*adev
;
666 return handle
&& !acpi_bus_get_device(handle
, &adev
) ? adev
: NULL
;
670 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
671 * @dev: Device to put into a low-power state.
672 * @adev: ACPI device node corresponding to @dev.
673 * @system_state: System state to choose the device state for.
675 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
680 if (!acpi_device_power_manageable(adev
))
683 power_state
= acpi_device_power_state(dev
, adev
, system_state
,
684 ACPI_STATE_D3
, NULL
);
685 if (power_state
< ACPI_STATE_D0
|| power_state
> ACPI_STATE_D3
)
688 return acpi_device_set_power(adev
, power_state
);
692 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
693 * @adev: ACPI device node to put into the full-power state.
695 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
697 return acpi_device_power_manageable(adev
) ?
698 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
701 #ifdef CONFIG_PM_RUNTIME
703 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
704 * @dev: Device to put into a low-power state.
706 * Put the given device into a runtime low-power state using the standard ACPI
707 * mechanism. Set up remote wakeup if desired, choose the state to put the
708 * device into (this checks if remote wakeup is expected to work too), and set
709 * the power state of the device.
711 int acpi_dev_runtime_suspend(struct device
*dev
)
713 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
720 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
722 error
= __acpi_device_run_wake(adev
, remote_wakeup
);
723 if (remote_wakeup
&& error
)
726 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
728 __acpi_device_run_wake(adev
, false);
732 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
735 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
736 * @dev: Device to put into the full-power state.
738 * Put the given device into the full-power state using the standard ACPI
739 * mechanism at run time. Set the power state of the device to ACPI D0 and
740 * disable remote wakeup.
742 int acpi_dev_runtime_resume(struct device
*dev
)
744 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
750 error
= acpi_dev_pm_full_power(adev
);
751 __acpi_device_run_wake(adev
, false);
754 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
757 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
758 * @dev: Device to suspend.
760 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
761 * it into a runtime low-power state.
763 int acpi_subsys_runtime_suspend(struct device
*dev
)
765 int ret
= pm_generic_runtime_suspend(dev
);
766 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
768 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
771 * acpi_subsys_runtime_resume - Resume device using ACPI.
772 * @dev: Device to Resume.
774 * Use ACPI to put the given device into the full-power state and carry out the
775 * generic runtime resume procedure for it.
777 int acpi_subsys_runtime_resume(struct device
*dev
)
779 int ret
= acpi_dev_runtime_resume(dev
);
780 return ret
? ret
: pm_generic_runtime_resume(dev
);
782 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
783 #endif /* CONFIG_PM_RUNTIME */
785 #ifdef CONFIG_PM_SLEEP
787 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
788 * @dev: Device to put into a low-power state.
790 * Put the given device into a low-power state during system transition to a
791 * sleep state using the standard ACPI mechanism. Set up system wakeup if
792 * desired, choose the state to put the device into (this checks if system
793 * wakeup is expected to work too), and set the power state of the device.
795 int acpi_dev_suspend_late(struct device
*dev
)
797 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
805 target_state
= acpi_target_system_state();
806 wakeup
= device_may_wakeup(dev
);
807 error
= __acpi_device_sleep_wake(adev
, target_state
, wakeup
);
811 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
813 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
817 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
820 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
821 * @dev: Device to put into the full-power state.
823 * Put the given device into the full-power state using the standard ACPI
824 * mechanism during system transition to the working state. Set the power
825 * state of the device to ACPI D0 and disable remote wakeup.
827 int acpi_dev_resume_early(struct device
*dev
)
829 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
835 error
= acpi_dev_pm_full_power(adev
);
836 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
839 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
842 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
843 * @dev: Device to prepare.
845 int acpi_subsys_prepare(struct device
*dev
)
848 * Follow PCI and resume devices suspended at run time before running
849 * their system suspend callbacks.
851 pm_runtime_resume(dev
);
852 return pm_generic_prepare(dev
);
854 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
857 * acpi_subsys_suspend_late - Suspend device using ACPI.
858 * @dev: Device to suspend.
860 * Carry out the generic late suspend procedure for @dev and use ACPI to put
861 * it into a low-power state during system transition into a sleep state.
863 int acpi_subsys_suspend_late(struct device
*dev
)
865 int ret
= pm_generic_suspend_late(dev
);
866 return ret
? ret
: acpi_dev_suspend_late(dev
);
868 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
871 * acpi_subsys_resume_early - Resume device using ACPI.
872 * @dev: Device to Resume.
874 * Use ACPI to put the given device into the full-power state and carry out the
875 * generic early resume procedure for it during system transition into the
878 int acpi_subsys_resume_early(struct device
*dev
)
880 int ret
= acpi_dev_resume_early(dev
);
881 return ret
? ret
: pm_generic_resume_early(dev
);
883 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
884 #endif /* CONFIG_PM_SLEEP */
886 static struct dev_pm_domain acpi_general_pm_domain
= {
888 #ifdef CONFIG_PM_RUNTIME
889 .runtime_suspend
= acpi_subsys_runtime_suspend
,
890 .runtime_resume
= acpi_subsys_runtime_resume
,
891 .runtime_idle
= pm_generic_runtime_idle
,
893 #ifdef CONFIG_PM_SLEEP
894 .prepare
= acpi_subsys_prepare
,
895 .suspend_late
= acpi_subsys_suspend_late
,
896 .resume_early
= acpi_subsys_resume_early
,
897 .poweroff_late
= acpi_subsys_suspend_late
,
898 .restore_early
= acpi_subsys_resume_early
,
904 * acpi_dev_pm_attach - Prepare device for ACPI power management.
905 * @dev: Device to prepare.
906 * @power_on: Whether or not to power on the device.
908 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
909 * attached to it, install a wakeup notification handler for the device and
910 * add it to the general ACPI PM domain. If @power_on is set, the device will
911 * be put into the ACPI D0 state before the function returns.
913 * This assumes that the @dev's bus type uses generic power management callbacks
914 * (or doesn't use any power management callbacks at all).
916 * Callers must ensure proper synchronization of this function with power
917 * management callbacks.
919 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
921 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
929 acpi_add_pm_notifier(adev
, acpi_wakeup_device
, dev
);
930 dev
->pm_domain
= &acpi_general_pm_domain
;
932 acpi_dev_pm_full_power(adev
);
933 __acpi_device_run_wake(adev
, false);
937 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
940 * acpi_dev_pm_detach - Remove ACPI power management from the device.
941 * @dev: Device to take care of.
942 * @power_off: Whether or not to try to remove power from the device.
944 * Remove the device from the general ACPI PM domain and remove its wakeup
945 * notifier. If @power_off is set, additionally remove power from the device if
948 * Callers must ensure proper synchronization of this function with power
949 * management callbacks.
951 void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
953 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
955 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
956 dev
->pm_domain
= NULL
;
957 acpi_remove_pm_notifier(adev
, acpi_wakeup_device
);
960 * If the device's PM QoS resume latency limit or flags
961 * have been exposed to user space, they have to be
962 * hidden at this point, so that they don't affect the
963 * choice of the low-power state to put the device into.
965 dev_pm_qos_hide_latency_limit(dev
);
966 dev_pm_qos_hide_flags(dev
);
967 __acpi_device_run_wake(adev
, false);
968 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
972 EXPORT_SYMBOL_GPL(acpi_dev_pm_detach
);
975 * acpi_dev_pm_add_dependent - Add physical device depending for PM.
976 * @handle: Handle of ACPI device node.
977 * @depdev: Device depending on that node for PM.
979 void acpi_dev_pm_add_dependent(acpi_handle handle
, struct device
*depdev
)
981 struct acpi_device_physical_node
*dep
;
982 struct acpi_device
*adev
;
984 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
987 mutex_lock(&adev
->physical_node_lock
);
989 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
990 if (dep
->dev
== depdev
)
993 dep
= kzalloc(sizeof(*dep
), GFP_KERNEL
);
996 list_add_tail(&dep
->node
, &adev
->power_dependent
);
1000 mutex_unlock(&adev
->physical_node_lock
);
1002 EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent
);
1005 * acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
1006 * @handle: Handle of ACPI device node.
1007 * @depdev: Device depending on that node for PM.
1009 void acpi_dev_pm_remove_dependent(acpi_handle handle
, struct device
*depdev
)
1011 struct acpi_device_physical_node
*dep
;
1012 struct acpi_device
*adev
;
1014 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
1017 mutex_lock(&adev
->physical_node_lock
);
1019 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
1020 if (dep
->dev
== depdev
) {
1021 list_del(&dep
->node
);
1026 mutex_unlock(&adev
->physical_node_lock
);
1028 EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent
);
1029 #endif /* CONFIG_PM */