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
;
294 * acpi_device_fix_up_power - Force device with missing _PSC into D0.
295 * @device: Device object whose power state is to be fixed up.
297 * Devices without power resources and _PSC, but having _PS0 and _PS3 defined,
298 * are assumed to be put into D0 by the BIOS. However, in some cases that may
299 * not be the case and this function should be used then.
301 int acpi_device_fix_up_power(struct acpi_device
*device
)
305 if (!device
->power
.flags
.power_resources
306 && !device
->power
.flags
.explicit_get
307 && device
->power
.state
== ACPI_STATE_D0
)
308 ret
= acpi_dev_pm_explicit_set(device
, ACPI_STATE_D0
);
313 int acpi_bus_update_power(acpi_handle handle
, int *state_p
)
315 struct acpi_device
*device
;
319 result
= acpi_bus_get_device(handle
, &device
);
323 result
= acpi_device_get_power(device
, &state
);
327 if (state
== ACPI_STATE_UNKNOWN
)
328 state
= ACPI_STATE_D0
;
330 result
= acpi_device_set_power(device
, state
);
331 if (!result
&& state_p
)
336 EXPORT_SYMBOL_GPL(acpi_bus_update_power
);
338 bool acpi_bus_power_manageable(acpi_handle handle
)
340 struct acpi_device
*device
;
343 result
= acpi_bus_get_device(handle
, &device
);
344 return result
? false : device
->flags
.power_manageable
;
346 EXPORT_SYMBOL(acpi_bus_power_manageable
);
349 static DEFINE_MUTEX(acpi_pm_notifier_lock
);
352 * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
353 * @adev: ACPI device to add the notifier for.
354 * @context: Context information to pass to the notifier routine.
356 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
357 * PM wakeup events. For example, wakeup events may be generated for bridges
358 * if one of the devices below the bridge is signaling wakeup, even if the
359 * bridge itself doesn't have a wakeup GPE associated with it.
361 acpi_status
acpi_add_pm_notifier(struct acpi_device
*adev
,
362 acpi_notify_handler handler
, void *context
)
364 acpi_status status
= AE_ALREADY_EXISTS
;
366 mutex_lock(&acpi_pm_notifier_lock
);
368 if (adev
->wakeup
.flags
.notifier_present
)
371 status
= acpi_install_notify_handler(adev
->handle
,
374 if (ACPI_FAILURE(status
))
377 adev
->wakeup
.flags
.notifier_present
= true;
380 mutex_unlock(&acpi_pm_notifier_lock
);
385 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
386 * @adev: ACPI device to remove the notifier from.
388 acpi_status
acpi_remove_pm_notifier(struct acpi_device
*adev
,
389 acpi_notify_handler handler
)
391 acpi_status status
= AE_BAD_PARAMETER
;
393 mutex_lock(&acpi_pm_notifier_lock
);
395 if (!adev
->wakeup
.flags
.notifier_present
)
398 status
= acpi_remove_notify_handler(adev
->handle
,
401 if (ACPI_FAILURE(status
))
404 adev
->wakeup
.flags
.notifier_present
= false;
407 mutex_unlock(&acpi_pm_notifier_lock
);
411 bool acpi_bus_can_wakeup(acpi_handle handle
)
413 struct acpi_device
*device
;
416 result
= acpi_bus_get_device(handle
, &device
);
417 return result
? false : device
->wakeup
.flags
.valid
;
419 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
422 * acpi_device_power_state - Get preferred power state of ACPI device.
423 * @dev: Device whose preferred target power state to return.
424 * @adev: ACPI device node corresponding to @dev.
425 * @target_state: System state to match the resultant device state.
426 * @d_max_in: Deepest low-power state to take into consideration.
427 * @d_min_p: Location to store the upper limit of the allowed states range.
428 * Return value: Preferred power state of the device on success, -ENODEV
429 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
431 * Find the lowest power (highest number) ACPI device power state that the
432 * device can be in while the system is in the state represented by
433 * @target_state. If @d_min_p is set, the highest power (lowest number) device
434 * power state that @dev can be in for the given system sleep state is stored
435 * at the location pointed to by it.
437 * Callers must ensure that @dev and @adev are valid pointers and that @adev
438 * actually corresponds to @dev before using this function.
440 int acpi_device_power_state(struct device
*dev
, struct acpi_device
*adev
,
441 u32 target_state
, int d_max_in
, int *d_min_p
)
443 char acpi_method
[] = "_SxD";
444 unsigned long long d_min
, d_max
;
447 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3
)
450 if (d_max_in
> ACPI_STATE_D3_HOT
) {
451 enum pm_qos_flags_status stat
;
453 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
454 if (stat
== PM_QOS_FLAGS_ALL
)
455 d_max_in
= ACPI_STATE_D3_HOT
;
458 acpi_method
[2] = '0' + target_state
;
460 * If the sleep state is S0, the lowest limit from ACPI is D3,
461 * but if the device has _S0W, we will use the value from _S0W
462 * as the lowest limit from ACPI. Finally, we will constrain
463 * the lowest limit with the specified one.
465 d_min
= ACPI_STATE_D0
;
466 d_max
= ACPI_STATE_D3
;
469 * If present, _SxD methods return the minimum D-state (highest power
470 * state) we can use for the corresponding S-states. Otherwise, the
471 * minimum D-state is D0 (ACPI 3.x).
473 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
474 * provided -- that's our fault recovery, we ignore retval.
476 if (target_state
> ACPI_STATE_S0
) {
477 acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
, &d_min
);
478 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
479 && adev
->wakeup
.sleep_state
>= target_state
;
480 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
482 wakeup
= adev
->wakeup
.flags
.valid
;
486 * If _PRW says we can wake up the system from the target sleep state,
487 * the D-state returned by _SxD is sufficient for that (we assume a
488 * wakeup-aware driver if wake is set). Still, if _SxW exists
489 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
490 * can wake the system. _S0W may be valid, too.
495 acpi_method
[3] = 'W';
496 status
= acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
,
498 if (ACPI_FAILURE(status
)) {
499 if (target_state
!= ACPI_STATE_S0
||
500 status
!= AE_NOT_FOUND
)
502 } else if (d_max
< d_min
) {
503 /* Warn the user of the broken DSDT */
504 printk(KERN_WARNING
"ACPI: Wrong value from %s\n",
511 if (d_max_in
< d_min
)
515 /* constrain d_max with specified lowest limit (max number) */
516 if (d_max
> d_max_in
) {
517 for (d_max
= d_max_in
; d_max
> d_min
; d_max
--) {
518 if (adev
->power
.states
[d_max
].flags
.valid
)
524 EXPORT_SYMBOL_GPL(acpi_device_power_state
);
527 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
528 * @dev: Device whose preferred target power state to return.
529 * @d_min_p: Location to store the upper limit of the allowed states range.
530 * @d_max_in: Deepest low-power state to take into consideration.
531 * Return value: Preferred power state of the device on success, -ENODEV
532 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
534 * The caller must ensure that @dev is valid before using this function.
536 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
538 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
539 struct acpi_device
*adev
;
541 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
542 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
546 return acpi_device_power_state(dev
, adev
, acpi_target_system_state(),
549 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
551 #ifdef CONFIG_PM_RUNTIME
553 * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
554 * @handle: ACPI handle of the device the notification is for.
555 * @event: Type of the signaled event.
556 * @context: Device corresponding to @handle.
558 static void acpi_wakeup_device(acpi_handle handle
, u32 event
, void *context
)
560 struct device
*dev
= context
;
562 if (event
== ACPI_NOTIFY_DEVICE_WAKE
&& dev
) {
563 pm_wakeup_event(dev
, 0);
564 pm_runtime_resume(dev
);
569 * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
570 * @adev: ACPI device to enable/disable the remote wakeup for.
571 * @enable: Whether to enable or disable the wakeup functionality.
573 * Enable/disable the GPE associated with @adev so that it can generate
574 * wakeup signals for the device in response to external (remote) events and
575 * enable/disable device wakeup power.
577 * Callers must ensure that @adev is a valid ACPI device node before executing
580 int __acpi_device_run_wake(struct acpi_device
*adev
, bool enable
)
582 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
588 error
= acpi_enable_wakeup_device_power(adev
, ACPI_STATE_S0
);
592 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
593 if (ACPI_FAILURE(res
)) {
594 acpi_disable_wakeup_device_power(adev
);
598 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
599 acpi_disable_wakeup_device_power(adev
);
605 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
606 * @dev: Device to enable/disable the platform to wake up.
607 * @enable: Whether to enable or disable the wakeup functionality.
609 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
611 struct acpi_device
*adev
;
614 if (!device_run_wake(phys_dev
))
617 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
618 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
619 dev_dbg(phys_dev
, "ACPI handle without context in %s!\n",
624 return __acpi_device_run_wake(adev
, enable
);
626 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
628 static inline void acpi_wakeup_device(acpi_handle handle
, u32 event
,
630 #endif /* CONFIG_PM_RUNTIME */
632 #ifdef CONFIG_PM_SLEEP
634 * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
635 * @dev: Device to enable/desible to wake up the system.
636 * @target_state: System state the device is supposed to wake up from.
637 * @enable: Whether to enable or disable @dev to wake up the system.
639 int __acpi_device_sleep_wake(struct acpi_device
*adev
, u32 target_state
,
643 acpi_enable_wakeup_device_power(adev
, target_state
) :
644 acpi_disable_wakeup_device_power(adev
);
648 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
649 * @dev: Device to enable/desible to wake up the system from sleep states.
650 * @enable: Whether to enable or disable @dev to wake up the system.
652 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
655 struct acpi_device
*adev
;
658 if (!device_can_wakeup(dev
))
661 handle
= DEVICE_ACPI_HANDLE(dev
);
662 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
663 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
667 error
= __acpi_device_sleep_wake(adev
, acpi_target_system_state(),
670 dev_info(dev
, "System wakeup %s by ACPI\n",
671 enable
? "enabled" : "disabled");
675 #endif /* CONFIG_PM_SLEEP */
678 * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
679 * @dev: Device to get the ACPI node for.
681 struct acpi_device
*acpi_dev_pm_get_node(struct device
*dev
)
683 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
684 struct acpi_device
*adev
;
686 return handle
&& !acpi_bus_get_device(handle
, &adev
) ? adev
: NULL
;
690 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
691 * @dev: Device to put into a low-power state.
692 * @adev: ACPI device node corresponding to @dev.
693 * @system_state: System state to choose the device state for.
695 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
700 if (!acpi_device_power_manageable(adev
))
703 power_state
= acpi_device_power_state(dev
, adev
, system_state
,
704 ACPI_STATE_D3
, NULL
);
705 if (power_state
< ACPI_STATE_D0
|| power_state
> ACPI_STATE_D3
)
708 return acpi_device_set_power(adev
, power_state
);
712 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
713 * @adev: ACPI device node to put into the full-power state.
715 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
717 return acpi_device_power_manageable(adev
) ?
718 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
721 #ifdef CONFIG_PM_RUNTIME
723 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
724 * @dev: Device to put into a low-power state.
726 * Put the given device into a runtime low-power state using the standard ACPI
727 * mechanism. Set up remote wakeup if desired, choose the state to put the
728 * device into (this checks if remote wakeup is expected to work too), and set
729 * the power state of the device.
731 int acpi_dev_runtime_suspend(struct device
*dev
)
733 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
740 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
742 error
= __acpi_device_run_wake(adev
, remote_wakeup
);
743 if (remote_wakeup
&& error
)
746 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
748 __acpi_device_run_wake(adev
, false);
752 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
755 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
756 * @dev: Device to put into the full-power state.
758 * Put the given device into the full-power state using the standard ACPI
759 * mechanism at run time. Set the power state of the device to ACPI D0 and
760 * disable remote wakeup.
762 int acpi_dev_runtime_resume(struct device
*dev
)
764 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
770 error
= acpi_dev_pm_full_power(adev
);
771 __acpi_device_run_wake(adev
, false);
774 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
777 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
778 * @dev: Device to suspend.
780 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
781 * it into a runtime low-power state.
783 int acpi_subsys_runtime_suspend(struct device
*dev
)
785 int ret
= pm_generic_runtime_suspend(dev
);
786 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
788 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
791 * acpi_subsys_runtime_resume - Resume device using ACPI.
792 * @dev: Device to Resume.
794 * Use ACPI to put the given device into the full-power state and carry out the
795 * generic runtime resume procedure for it.
797 int acpi_subsys_runtime_resume(struct device
*dev
)
799 int ret
= acpi_dev_runtime_resume(dev
);
800 return ret
? ret
: pm_generic_runtime_resume(dev
);
802 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
803 #endif /* CONFIG_PM_RUNTIME */
805 #ifdef CONFIG_PM_SLEEP
807 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
808 * @dev: Device to put into a low-power state.
810 * Put the given device into a low-power state during system transition to a
811 * sleep state using the standard ACPI mechanism. Set up system wakeup if
812 * desired, choose the state to put the device into (this checks if system
813 * wakeup is expected to work too), and set the power state of the device.
815 int acpi_dev_suspend_late(struct device
*dev
)
817 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
825 target_state
= acpi_target_system_state();
826 wakeup
= device_may_wakeup(dev
);
827 error
= __acpi_device_sleep_wake(adev
, target_state
, wakeup
);
831 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
833 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
837 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
840 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
841 * @dev: Device to put into the full-power state.
843 * Put the given device into the full-power state using the standard ACPI
844 * mechanism during system transition to the working state. Set the power
845 * state of the device to ACPI D0 and disable remote wakeup.
847 int acpi_dev_resume_early(struct device
*dev
)
849 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
855 error
= acpi_dev_pm_full_power(adev
);
856 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
859 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
862 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
863 * @dev: Device to prepare.
865 int acpi_subsys_prepare(struct device
*dev
)
868 * Follow PCI and resume devices suspended at run time before running
869 * their system suspend callbacks.
871 pm_runtime_resume(dev
);
872 return pm_generic_prepare(dev
);
874 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
877 * acpi_subsys_suspend_late - Suspend device using ACPI.
878 * @dev: Device to suspend.
880 * Carry out the generic late suspend procedure for @dev and use ACPI to put
881 * it into a low-power state during system transition into a sleep state.
883 int acpi_subsys_suspend_late(struct device
*dev
)
885 int ret
= pm_generic_suspend_late(dev
);
886 return ret
? ret
: acpi_dev_suspend_late(dev
);
888 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
891 * acpi_subsys_resume_early - Resume device using ACPI.
892 * @dev: Device to Resume.
894 * Use ACPI to put the given device into the full-power state and carry out the
895 * generic early resume procedure for it during system transition into the
898 int acpi_subsys_resume_early(struct device
*dev
)
900 int ret
= acpi_dev_resume_early(dev
);
901 return ret
? ret
: pm_generic_resume_early(dev
);
903 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
904 #endif /* CONFIG_PM_SLEEP */
906 static struct dev_pm_domain acpi_general_pm_domain
= {
908 #ifdef CONFIG_PM_RUNTIME
909 .runtime_suspend
= acpi_subsys_runtime_suspend
,
910 .runtime_resume
= acpi_subsys_runtime_resume
,
911 .runtime_idle
= pm_generic_runtime_idle
,
913 #ifdef CONFIG_PM_SLEEP
914 .prepare
= acpi_subsys_prepare
,
915 .suspend_late
= acpi_subsys_suspend_late
,
916 .resume_early
= acpi_subsys_resume_early
,
917 .poweroff_late
= acpi_subsys_suspend_late
,
918 .restore_early
= acpi_subsys_resume_early
,
924 * acpi_dev_pm_attach - Prepare device for ACPI power management.
925 * @dev: Device to prepare.
926 * @power_on: Whether or not to power on the device.
928 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
929 * attached to it, install a wakeup notification handler for the device and
930 * add it to the general ACPI PM domain. If @power_on is set, the device will
931 * be put into the ACPI D0 state before the function returns.
933 * This assumes that the @dev's bus type uses generic power management callbacks
934 * (or doesn't use any power management callbacks at all).
936 * Callers must ensure proper synchronization of this function with power
937 * management callbacks.
939 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
941 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
949 acpi_add_pm_notifier(adev
, acpi_wakeup_device
, dev
);
950 dev
->pm_domain
= &acpi_general_pm_domain
;
952 acpi_dev_pm_full_power(adev
);
953 __acpi_device_run_wake(adev
, false);
957 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
960 * acpi_dev_pm_detach - Remove ACPI power management from the device.
961 * @dev: Device to take care of.
962 * @power_off: Whether or not to try to remove power from the device.
964 * Remove the device from the general ACPI PM domain and remove its wakeup
965 * notifier. If @power_off is set, additionally remove power from the device if
968 * Callers must ensure proper synchronization of this function with power
969 * management callbacks.
971 void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
973 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
975 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
976 dev
->pm_domain
= NULL
;
977 acpi_remove_pm_notifier(adev
, acpi_wakeup_device
);
980 * If the device's PM QoS resume latency limit or flags
981 * have been exposed to user space, they have to be
982 * hidden at this point, so that they don't affect the
983 * choice of the low-power state to put the device into.
985 dev_pm_qos_hide_latency_limit(dev
);
986 dev_pm_qos_hide_flags(dev
);
987 __acpi_device_run_wake(adev
, false);
988 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
992 EXPORT_SYMBOL_GPL(acpi_dev_pm_detach
);
995 * acpi_dev_pm_add_dependent - Add physical device depending for PM.
996 * @handle: Handle of ACPI device node.
997 * @depdev: Device depending on that node for PM.
999 void acpi_dev_pm_add_dependent(acpi_handle handle
, struct device
*depdev
)
1001 struct acpi_device_physical_node
*dep
;
1002 struct acpi_device
*adev
;
1004 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
1007 mutex_lock(&adev
->physical_node_lock
);
1009 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
1010 if (dep
->dev
== depdev
)
1013 dep
= kzalloc(sizeof(*dep
), GFP_KERNEL
);
1016 list_add_tail(&dep
->node
, &adev
->power_dependent
);
1020 mutex_unlock(&adev
->physical_node_lock
);
1022 EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent
);
1025 * acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
1026 * @handle: Handle of ACPI device node.
1027 * @depdev: Device depending on that node for PM.
1029 void acpi_dev_pm_remove_dependent(acpi_handle handle
, struct device
*depdev
)
1031 struct acpi_device_physical_node
*dep
;
1032 struct acpi_device
*adev
;
1034 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
1037 mutex_lock(&adev
->physical_node_lock
);
1039 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
1040 if (dep
->dev
== depdev
) {
1041 list_del(&dep
->node
);
1046 mutex_unlock(&adev
->physical_node_lock
);
1048 EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent
);
1049 #endif /* CONFIG_PM */