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");
40 static DEFINE_MUTEX(acpi_pm_notifier_lock
);
43 * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
44 * @adev: ACPI device to add the notifier for.
45 * @context: Context information to pass to the notifier routine.
47 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
48 * PM wakeup events. For example, wakeup events may be generated for bridges
49 * if one of the devices below the bridge is signaling wakeup, even if the
50 * bridge itself doesn't have a wakeup GPE associated with it.
52 acpi_status
acpi_add_pm_notifier(struct acpi_device
*adev
,
53 acpi_notify_handler handler
, void *context
)
55 acpi_status status
= AE_ALREADY_EXISTS
;
57 mutex_lock(&acpi_pm_notifier_lock
);
59 if (adev
->wakeup
.flags
.notifier_present
)
62 status
= acpi_install_notify_handler(adev
->handle
,
65 if (ACPI_FAILURE(status
))
68 adev
->wakeup
.flags
.notifier_present
= true;
71 mutex_unlock(&acpi_pm_notifier_lock
);
76 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
77 * @adev: ACPI device to remove the notifier from.
79 acpi_status
acpi_remove_pm_notifier(struct acpi_device
*adev
,
80 acpi_notify_handler handler
)
82 acpi_status status
= AE_BAD_PARAMETER
;
84 mutex_lock(&acpi_pm_notifier_lock
);
86 if (!adev
->wakeup
.flags
.notifier_present
)
89 status
= acpi_remove_notify_handler(adev
->handle
,
92 if (ACPI_FAILURE(status
))
95 adev
->wakeup
.flags
.notifier_present
= false;
98 mutex_unlock(&acpi_pm_notifier_lock
);
103 * acpi_power_state_string - String representation of ACPI device power state.
104 * @state: ACPI device power state to return the string representation of.
106 const char *acpi_power_state_string(int state
)
115 case ACPI_STATE_D3_HOT
:
117 case ACPI_STATE_D3_COLD
:
125 * acpi_device_get_power - Get power state of an ACPI device.
126 * @device: Device to get the power state of.
127 * @state: Place to store the power state of the device.
129 * This function does not update the device's power.state field, but it may
130 * update its parent's power.state field (when the parent's power state is
131 * unknown and the device's power state turns out to be D0).
133 int acpi_device_get_power(struct acpi_device
*device
, int *state
)
135 int result
= ACPI_STATE_UNKNOWN
;
137 if (!device
|| !state
)
140 if (!device
->flags
.power_manageable
) {
141 /* TBD: Non-recursive algorithm for walking up hierarchy. */
142 *state
= device
->parent
?
143 device
->parent
->power
.state
: ACPI_STATE_D0
;
148 * Get the device's power state either directly (via _PSC) or
149 * indirectly (via power resources).
151 if (device
->power
.flags
.explicit_get
) {
152 unsigned long long psc
;
153 acpi_status status
= acpi_evaluate_integer(device
->handle
,
155 if (ACPI_FAILURE(status
))
160 /* The test below covers ACPI_STATE_UNKNOWN too. */
161 if (result
<= ACPI_STATE_D2
) {
163 } else if (device
->power
.flags
.power_resources
) {
164 int error
= acpi_power_get_inferred_state(device
, &result
);
167 } else if (result
== ACPI_STATE_D3_HOT
) {
168 result
= ACPI_STATE_D3
;
172 * If we were unsure about the device parent's power state up to this
173 * point, the fact that the device is in D0 implies that the parent has
176 if (device
->parent
&& device
->parent
->power
.state
== ACPI_STATE_UNKNOWN
177 && result
== ACPI_STATE_D0
)
178 device
->parent
->power
.state
= ACPI_STATE_D0
;
183 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device [%s] power state is %s\n",
184 device
->pnp
.bus_id
, acpi_power_state_string(*state
)));
189 static int acpi_dev_pm_explicit_set(struct acpi_device
*adev
, int state
)
191 if (adev
->power
.states
[state
].flags
.explicit_set
) {
192 char method
[5] = { '_', 'P', 'S', '0' + state
, '\0' };
195 status
= acpi_evaluate_object(adev
->handle
, method
, NULL
, NULL
);
196 if (ACPI_FAILURE(status
))
203 * acpi_device_set_power - Set power state of an ACPI device.
204 * @device: Device to set the power state of.
205 * @state: New power state to set.
207 * Callers must ensure that the device is power manageable before using this
210 int acpi_device_set_power(struct acpi_device
*device
, int state
)
213 bool cut_power
= false;
215 if (!device
|| (state
< ACPI_STATE_D0
) || (state
> ACPI_STATE_D3_COLD
))
218 /* Make sure this is a valid target state */
220 if (state
== device
->power
.state
) {
221 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Device is already at %s\n",
222 acpi_power_state_string(state
)));
226 if (!device
->power
.states
[state
].flags
.valid
) {
227 printk(KERN_WARNING PREFIX
"Device does not support %s\n",
228 acpi_power_state_string(state
));
231 if (device
->parent
&& (state
< device
->parent
->power
.state
)) {
232 printk(KERN_WARNING PREFIX
233 "Cannot set device to a higher-powered"
234 " state than parent\n");
238 /* For D3cold we should first transition into D3hot. */
239 if (state
== ACPI_STATE_D3_COLD
240 && device
->power
.states
[ACPI_STATE_D3_COLD
].flags
.os_accessible
) {
241 state
= ACPI_STATE_D3_HOT
;
245 if (state
< device
->power
.state
&& state
!= ACPI_STATE_D0
246 && device
->power
.state
>= ACPI_STATE_D3_HOT
) {
247 printk(KERN_WARNING PREFIX
248 "Cannot transition to non-D0 state from D3\n");
255 * In accordance with the ACPI specification first apply power (via
256 * power resources) and then evalute _PSx.
258 if (device
->power
.flags
.power_resources
) {
259 result
= acpi_power_transition(device
, state
);
263 result
= acpi_dev_pm_explicit_set(device
, state
);
268 device
->power
.state
= state
;
269 state
= ACPI_STATE_D3_COLD
;
270 result
= acpi_power_transition(device
, state
);
275 printk(KERN_WARNING PREFIX
276 "Device [%s] failed to transition to %s\n",
278 acpi_power_state_string(state
));
280 device
->power
.state
= state
;
281 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
282 "Device [%s] transitioned to %s\n",
284 acpi_power_state_string(state
)));
289 EXPORT_SYMBOL(acpi_device_set_power
);
291 int acpi_bus_set_power(acpi_handle handle
, int state
)
293 struct acpi_device
*device
;
296 result
= acpi_bus_get_device(handle
, &device
);
300 if (!device
->flags
.power_manageable
) {
301 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
302 "Device [%s] is not power manageable\n",
303 dev_name(&device
->dev
)));
307 return acpi_device_set_power(device
, state
);
309 EXPORT_SYMBOL(acpi_bus_set_power
);
311 int acpi_bus_init_power(struct acpi_device
*device
)
319 device
->power
.state
= ACPI_STATE_UNKNOWN
;
321 result
= acpi_device_get_power(device
, &state
);
325 if (state
< ACPI_STATE_D3_COLD
&& device
->power
.flags
.power_resources
) {
326 result
= acpi_power_on_resources(device
, state
);
330 result
= acpi_dev_pm_explicit_set(device
, state
);
333 } else if (state
== ACPI_STATE_UNKNOWN
) {
334 /* No power resources and missing _PSC? Try to force D0. */
335 state
= ACPI_STATE_D0
;
336 result
= acpi_dev_pm_explicit_set(device
, state
);
340 device
->power
.state
= state
;
344 int acpi_bus_update_power(acpi_handle handle
, int *state_p
)
346 struct acpi_device
*device
;
350 result
= acpi_bus_get_device(handle
, &device
);
354 result
= acpi_device_get_power(device
, &state
);
358 if (state
== ACPI_STATE_UNKNOWN
)
359 state
= ACPI_STATE_D0
;
361 result
= acpi_device_set_power(device
, state
);
362 if (!result
&& state_p
)
367 EXPORT_SYMBOL_GPL(acpi_bus_update_power
);
369 bool acpi_bus_power_manageable(acpi_handle handle
)
371 struct acpi_device
*device
;
374 result
= acpi_bus_get_device(handle
, &device
);
375 return result
? false : device
->flags
.power_manageable
;
377 EXPORT_SYMBOL(acpi_bus_power_manageable
);
379 bool acpi_bus_can_wakeup(acpi_handle handle
)
381 struct acpi_device
*device
;
384 result
= acpi_bus_get_device(handle
, &device
);
385 return result
? false : device
->wakeup
.flags
.valid
;
387 EXPORT_SYMBOL(acpi_bus_can_wakeup
);
390 * acpi_device_power_state - Get preferred power state of ACPI device.
391 * @dev: Device whose preferred target power state to return.
392 * @adev: ACPI device node corresponding to @dev.
393 * @target_state: System state to match the resultant device state.
394 * @d_max_in: Deepest low-power state to take into consideration.
395 * @d_min_p: Location to store the upper limit of the allowed states range.
396 * Return value: Preferred power state of the device on success, -ENODEV
397 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
399 * Find the lowest power (highest number) ACPI device power state that the
400 * device can be in while the system is in the state represented by
401 * @target_state. If @d_min_p is set, the highest power (lowest number) device
402 * power state that @dev can be in for the given system sleep state is stored
403 * at the location pointed to by it.
405 * Callers must ensure that @dev and @adev are valid pointers and that @adev
406 * actually corresponds to @dev before using this function.
408 int acpi_device_power_state(struct device
*dev
, struct acpi_device
*adev
,
409 u32 target_state
, int d_max_in
, int *d_min_p
)
411 char acpi_method
[] = "_SxD";
412 unsigned long long d_min
, d_max
;
415 if (d_max_in
< ACPI_STATE_D0
|| d_max_in
> ACPI_STATE_D3
)
418 if (d_max_in
> ACPI_STATE_D3_HOT
) {
419 enum pm_qos_flags_status stat
;
421 stat
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_NO_POWER_OFF
);
422 if (stat
== PM_QOS_FLAGS_ALL
)
423 d_max_in
= ACPI_STATE_D3_HOT
;
426 acpi_method
[2] = '0' + target_state
;
428 * If the sleep state is S0, the lowest limit from ACPI is D3,
429 * but if the device has _S0W, we will use the value from _S0W
430 * as the lowest limit from ACPI. Finally, we will constrain
431 * the lowest limit with the specified one.
433 d_min
= ACPI_STATE_D0
;
434 d_max
= ACPI_STATE_D3
;
437 * If present, _SxD methods return the minimum D-state (highest power
438 * state) we can use for the corresponding S-states. Otherwise, the
439 * minimum D-state is D0 (ACPI 3.x).
441 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
442 * provided -- that's our fault recovery, we ignore retval.
444 if (target_state
> ACPI_STATE_S0
) {
445 acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
, &d_min
);
446 wakeup
= device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
447 && adev
->wakeup
.sleep_state
>= target_state
;
448 } else if (dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) !=
450 wakeup
= adev
->wakeup
.flags
.valid
;
454 * If _PRW says we can wake up the system from the target sleep state,
455 * the D-state returned by _SxD is sufficient for that (we assume a
456 * wakeup-aware driver if wake is set). Still, if _SxW exists
457 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
458 * can wake the system. _S0W may be valid, too.
463 acpi_method
[3] = 'W';
464 status
= acpi_evaluate_integer(adev
->handle
, acpi_method
, NULL
,
466 if (ACPI_FAILURE(status
)) {
467 if (target_state
!= ACPI_STATE_S0
||
468 status
!= AE_NOT_FOUND
)
470 } else if (d_max
< d_min
) {
471 /* Warn the user of the broken DSDT */
472 printk(KERN_WARNING
"ACPI: Wrong value from %s\n",
479 if (d_max_in
< d_min
)
483 /* constrain d_max with specified lowest limit (max number) */
484 if (d_max
> d_max_in
) {
485 for (d_max
= d_max_in
; d_max
> d_min
; d_max
--) {
486 if (adev
->power
.states
[d_max
].flags
.valid
)
492 EXPORT_SYMBOL_GPL(acpi_device_power_state
);
495 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
496 * @dev: Device whose preferred target power state to return.
497 * @d_min_p: Location to store the upper limit of the allowed states range.
498 * @d_max_in: Deepest low-power state to take into consideration.
499 * Return value: Preferred power state of the device on success, -ENODEV
500 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
502 * The caller must ensure that @dev is valid before using this function.
504 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
, int d_max_in
)
506 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
507 struct acpi_device
*adev
;
509 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
510 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
514 return acpi_device_power_state(dev
, adev
, acpi_target_system_state(),
517 EXPORT_SYMBOL(acpi_pm_device_sleep_state
);
519 #ifdef CONFIG_PM_RUNTIME
521 * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
522 * @handle: ACPI handle of the device the notification is for.
523 * @event: Type of the signaled event.
524 * @context: Device corresponding to @handle.
526 static void acpi_wakeup_device(acpi_handle handle
, u32 event
, void *context
)
528 struct device
*dev
= context
;
530 if (event
== ACPI_NOTIFY_DEVICE_WAKE
&& dev
) {
531 pm_wakeup_event(dev
, 0);
532 pm_runtime_resume(dev
);
537 * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
538 * @adev: ACPI device to enable/disable the remote wakeup for.
539 * @enable: Whether to enable or disable the wakeup functionality.
541 * Enable/disable the GPE associated with @adev so that it can generate
542 * wakeup signals for the device in response to external (remote) events and
543 * enable/disable device wakeup power.
545 * Callers must ensure that @adev is a valid ACPI device node before executing
548 int __acpi_device_run_wake(struct acpi_device
*adev
, bool enable
)
550 struct acpi_device_wakeup
*wakeup
= &adev
->wakeup
;
556 error
= acpi_enable_wakeup_device_power(adev
, ACPI_STATE_S0
);
560 res
= acpi_enable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
561 if (ACPI_FAILURE(res
)) {
562 acpi_disable_wakeup_device_power(adev
);
566 acpi_disable_gpe(wakeup
->gpe_device
, wakeup
->gpe_number
);
567 acpi_disable_wakeup_device_power(adev
);
573 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
574 * @dev: Device to enable/disable the platform to wake up.
575 * @enable: Whether to enable or disable the wakeup functionality.
577 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
579 struct acpi_device
*adev
;
582 if (!device_run_wake(phys_dev
))
585 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
586 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
587 dev_dbg(phys_dev
, "ACPI handle without context in %s!\n",
592 return __acpi_device_run_wake(adev
, enable
);
594 EXPORT_SYMBOL(acpi_pm_device_run_wake
);
596 static inline void acpi_wakeup_device(acpi_handle handle
, u32 event
,
598 #endif /* CONFIG_PM_RUNTIME */
600 #ifdef CONFIG_PM_SLEEP
602 * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
603 * @dev: Device to enable/desible to wake up the system.
604 * @target_state: System state the device is supposed to wake up from.
605 * @enable: Whether to enable or disable @dev to wake up the system.
607 int __acpi_device_sleep_wake(struct acpi_device
*adev
, u32 target_state
,
611 acpi_enable_wakeup_device_power(adev
, target_state
) :
612 acpi_disable_wakeup_device_power(adev
);
616 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
617 * @dev: Device to enable/desible to wake up the system from sleep states.
618 * @enable: Whether to enable or disable @dev to wake up the system.
620 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
623 struct acpi_device
*adev
;
626 if (!device_can_wakeup(dev
))
629 handle
= DEVICE_ACPI_HANDLE(dev
);
630 if (!handle
|| acpi_bus_get_device(handle
, &adev
)) {
631 dev_dbg(dev
, "ACPI handle without context in %s!\n", __func__
);
635 error
= __acpi_device_sleep_wake(adev
, acpi_target_system_state(),
638 dev_info(dev
, "System wakeup %s by ACPI\n",
639 enable
? "enabled" : "disabled");
643 #endif /* CONFIG_PM_SLEEP */
646 * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
647 * @dev: Device to get the ACPI node for.
649 struct acpi_device
*acpi_dev_pm_get_node(struct device
*dev
)
651 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
652 struct acpi_device
*adev
;
654 return handle
&& !acpi_bus_get_device(handle
, &adev
) ? adev
: NULL
;
658 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
659 * @dev: Device to put into a low-power state.
660 * @adev: ACPI device node corresponding to @dev.
661 * @system_state: System state to choose the device state for.
663 static int acpi_dev_pm_low_power(struct device
*dev
, struct acpi_device
*adev
,
668 if (!acpi_device_power_manageable(adev
))
671 power_state
= acpi_device_power_state(dev
, adev
, system_state
,
672 ACPI_STATE_D3
, NULL
);
673 if (power_state
< ACPI_STATE_D0
|| power_state
> ACPI_STATE_D3
)
676 return acpi_device_set_power(adev
, power_state
);
680 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
681 * @adev: ACPI device node to put into the full-power state.
683 static int acpi_dev_pm_full_power(struct acpi_device
*adev
)
685 return acpi_device_power_manageable(adev
) ?
686 acpi_device_set_power(adev
, ACPI_STATE_D0
) : 0;
689 #ifdef CONFIG_PM_RUNTIME
691 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
692 * @dev: Device to put into a low-power state.
694 * Put the given device into a runtime low-power state using the standard ACPI
695 * mechanism. Set up remote wakeup if desired, choose the state to put the
696 * device into (this checks if remote wakeup is expected to work too), and set
697 * the power state of the device.
699 int acpi_dev_runtime_suspend(struct device
*dev
)
701 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
708 remote_wakeup
= dev_pm_qos_flags(dev
, PM_QOS_FLAG_REMOTE_WAKEUP
) >
710 error
= __acpi_device_run_wake(adev
, remote_wakeup
);
711 if (remote_wakeup
&& error
)
714 error
= acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
716 __acpi_device_run_wake(adev
, false);
720 EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend
);
723 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
724 * @dev: Device to put into the full-power state.
726 * Put the given device into the full-power state using the standard ACPI
727 * mechanism at run time. Set the power state of the device to ACPI D0 and
728 * disable remote wakeup.
730 int acpi_dev_runtime_resume(struct device
*dev
)
732 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
738 error
= acpi_dev_pm_full_power(adev
);
739 __acpi_device_run_wake(adev
, false);
742 EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume
);
745 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
746 * @dev: Device to suspend.
748 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
749 * it into a runtime low-power state.
751 int acpi_subsys_runtime_suspend(struct device
*dev
)
753 int ret
= pm_generic_runtime_suspend(dev
);
754 return ret
? ret
: acpi_dev_runtime_suspend(dev
);
756 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend
);
759 * acpi_subsys_runtime_resume - Resume device using ACPI.
760 * @dev: Device to Resume.
762 * Use ACPI to put the given device into the full-power state and carry out the
763 * generic runtime resume procedure for it.
765 int acpi_subsys_runtime_resume(struct device
*dev
)
767 int ret
= acpi_dev_runtime_resume(dev
);
768 return ret
? ret
: pm_generic_runtime_resume(dev
);
770 EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume
);
771 #endif /* CONFIG_PM_RUNTIME */
773 #ifdef CONFIG_PM_SLEEP
775 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
776 * @dev: Device to put into a low-power state.
778 * Put the given device into a low-power state during system transition to a
779 * sleep state using the standard ACPI mechanism. Set up system wakeup if
780 * desired, choose the state to put the device into (this checks if system
781 * wakeup is expected to work too), and set the power state of the device.
783 int acpi_dev_suspend_late(struct device
*dev
)
785 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
793 target_state
= acpi_target_system_state();
794 wakeup
= device_may_wakeup(dev
);
795 error
= __acpi_device_sleep_wake(adev
, target_state
, wakeup
);
799 error
= acpi_dev_pm_low_power(dev
, adev
, target_state
);
801 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
805 EXPORT_SYMBOL_GPL(acpi_dev_suspend_late
);
808 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
809 * @dev: Device to put into the full-power state.
811 * Put the given device into the full-power state using the standard ACPI
812 * mechanism during system transition to the working state. Set the power
813 * state of the device to ACPI D0 and disable remote wakeup.
815 int acpi_dev_resume_early(struct device
*dev
)
817 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
823 error
= acpi_dev_pm_full_power(adev
);
824 __acpi_device_sleep_wake(adev
, ACPI_STATE_UNKNOWN
, false);
827 EXPORT_SYMBOL_GPL(acpi_dev_resume_early
);
830 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
831 * @dev: Device to prepare.
833 int acpi_subsys_prepare(struct device
*dev
)
836 * Follow PCI and resume devices suspended at run time before running
837 * their system suspend callbacks.
839 pm_runtime_resume(dev
);
840 return pm_generic_prepare(dev
);
842 EXPORT_SYMBOL_GPL(acpi_subsys_prepare
);
845 * acpi_subsys_suspend_late - Suspend device using ACPI.
846 * @dev: Device to suspend.
848 * Carry out the generic late suspend procedure for @dev and use ACPI to put
849 * it into a low-power state during system transition into a sleep state.
851 int acpi_subsys_suspend_late(struct device
*dev
)
853 int ret
= pm_generic_suspend_late(dev
);
854 return ret
? ret
: acpi_dev_suspend_late(dev
);
856 EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late
);
859 * acpi_subsys_resume_early - Resume device using ACPI.
860 * @dev: Device to Resume.
862 * Use ACPI to put the given device into the full-power state and carry out the
863 * generic early resume procedure for it during system transition into the
866 int acpi_subsys_resume_early(struct device
*dev
)
868 int ret
= acpi_dev_resume_early(dev
);
869 return ret
? ret
: pm_generic_resume_early(dev
);
871 EXPORT_SYMBOL_GPL(acpi_subsys_resume_early
);
872 #endif /* CONFIG_PM_SLEEP */
874 static struct dev_pm_domain acpi_general_pm_domain
= {
876 #ifdef CONFIG_PM_RUNTIME
877 .runtime_suspend
= acpi_subsys_runtime_suspend
,
878 .runtime_resume
= acpi_subsys_runtime_resume
,
879 .runtime_idle
= pm_generic_runtime_idle
,
881 #ifdef CONFIG_PM_SLEEP
882 .prepare
= acpi_subsys_prepare
,
883 .suspend_late
= acpi_subsys_suspend_late
,
884 .resume_early
= acpi_subsys_resume_early
,
885 .poweroff_late
= acpi_subsys_suspend_late
,
886 .restore_early
= acpi_subsys_resume_early
,
892 * acpi_dev_pm_attach - Prepare device for ACPI power management.
893 * @dev: Device to prepare.
894 * @power_on: Whether or not to power on the device.
896 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
897 * attached to it, install a wakeup notification handler for the device and
898 * add it to the general ACPI PM domain. If @power_on is set, the device will
899 * be put into the ACPI D0 state before the function returns.
901 * This assumes that the @dev's bus type uses generic power management callbacks
902 * (or doesn't use any power management callbacks at all).
904 * Callers must ensure proper synchronization of this function with power
905 * management callbacks.
907 int acpi_dev_pm_attach(struct device
*dev
, bool power_on
)
909 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
917 acpi_add_pm_notifier(adev
, acpi_wakeup_device
, dev
);
918 dev
->pm_domain
= &acpi_general_pm_domain
;
920 acpi_dev_pm_full_power(adev
);
921 __acpi_device_run_wake(adev
, false);
925 EXPORT_SYMBOL_GPL(acpi_dev_pm_attach
);
928 * acpi_dev_pm_detach - Remove ACPI power management from the device.
929 * @dev: Device to take care of.
930 * @power_off: Whether or not to try to remove power from the device.
932 * Remove the device from the general ACPI PM domain and remove its wakeup
933 * notifier. If @power_off is set, additionally remove power from the device if
936 * Callers must ensure proper synchronization of this function with power
937 * management callbacks.
939 void acpi_dev_pm_detach(struct device
*dev
, bool power_off
)
941 struct acpi_device
*adev
= acpi_dev_pm_get_node(dev
);
943 if (adev
&& dev
->pm_domain
== &acpi_general_pm_domain
) {
944 dev
->pm_domain
= NULL
;
945 acpi_remove_pm_notifier(adev
, acpi_wakeup_device
);
948 * If the device's PM QoS resume latency limit or flags
949 * have been exposed to user space, they have to be
950 * hidden at this point, so that they don't affect the
951 * choice of the low-power state to put the device into.
953 dev_pm_qos_hide_latency_limit(dev
);
954 dev_pm_qos_hide_flags(dev
);
955 __acpi_device_run_wake(adev
, false);
956 acpi_dev_pm_low_power(dev
, adev
, ACPI_STATE_S0
);
960 EXPORT_SYMBOL_GPL(acpi_dev_pm_detach
);
963 * acpi_dev_pm_add_dependent - Add physical device depending for PM.
964 * @handle: Handle of ACPI device node.
965 * @depdev: Device depending on that node for PM.
967 void acpi_dev_pm_add_dependent(acpi_handle handle
, struct device
*depdev
)
969 struct acpi_device_physical_node
*dep
;
970 struct acpi_device
*adev
;
972 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
975 mutex_lock(&adev
->physical_node_lock
);
977 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
978 if (dep
->dev
== depdev
)
981 dep
= kzalloc(sizeof(*dep
), GFP_KERNEL
);
984 list_add_tail(&dep
->node
, &adev
->power_dependent
);
988 mutex_unlock(&adev
->physical_node_lock
);
990 EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent
);
993 * acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
994 * @handle: Handle of ACPI device node.
995 * @depdev: Device depending on that node for PM.
997 void acpi_dev_pm_remove_dependent(acpi_handle handle
, struct device
*depdev
)
999 struct acpi_device_physical_node
*dep
;
1000 struct acpi_device
*adev
;
1002 if (!depdev
|| acpi_bus_get_device(handle
, &adev
))
1005 mutex_lock(&adev
->physical_node_lock
);
1007 list_for_each_entry(dep
, &adev
->power_dependent
, node
)
1008 if (dep
->dev
== depdev
) {
1009 list_del(&dep
->node
);
1014 mutex_unlock(&adev
->physical_node_lock
);
1016 EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent
);