1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * pm.h - Power management interface
5 * Copyright (C) 2000 Andrew Henroid
11 #include <linux/list.h>
12 #include <linux/workqueue.h>
13 #include <linux/spinlock.h>
14 #include <linux/wait.h>
15 #include <linux/timer.h>
16 #include <linux/hrtimer.h>
17 #include <linux/completion.h>
20 * Callbacks for platform drivers to implement.
22 extern void (*pm_power_off)(void);
23 extern void (*pm_power_off_prepare)(void);
25 struct device; /* we have a circular dep with device.h */
26 #ifdef CONFIG_VT_CONSOLE_SLEEP
27 extern void pm_vt_switch_required(struct device *dev, bool required);
28 extern void pm_vt_switch_unregister(struct device *dev);
30 static inline void pm_vt_switch_required(struct device *dev, bool required)
33 static inline void pm_vt_switch_unregister(struct device *dev)
36 #endif /* CONFIG_VT_CONSOLE_SLEEP */
39 * Device power management
44 extern const char power_group_name[]; /* = "power" */
46 #define power_group_name NULL
49 typedef struct pm_message {
54 * struct dev_pm_ops - device PM callbacks.
56 * @prepare: The principal role of this callback is to prevent new children of
57 * the device from being registered after it has returned (the driver's
58 * subsystem and generally the rest of the kernel is supposed to prevent
59 * new calls to the probe method from being made too once @prepare() has
60 * succeeded). If @prepare() detects a situation it cannot handle (e.g.
61 * registration of a child already in progress), it may return -EAGAIN, so
62 * that the PM core can execute it once again (e.g. after a new child has
63 * been registered) to recover from the race condition.
64 * This method is executed for all kinds of suspend transitions and is
65 * followed by one of the suspend callbacks: @suspend(), @freeze(), or
66 * @poweroff(). If the transition is a suspend to memory or standby (that
67 * is, not related to hibernation), the return value of @prepare() may be
68 * used to indicate to the PM core to leave the device in runtime suspend
69 * if applicable. Namely, if @prepare() returns a positive number, the PM
70 * core will understand that as a declaration that the device appears to be
71 * runtime-suspended and it may be left in that state during the entire
72 * transition and during the subsequent resume if all of its descendants
73 * are left in runtime suspend too. If that happens, @complete() will be
74 * executed directly after @prepare() and it must ensure the proper
75 * functioning of the device after the system resume.
76 * The PM core executes subsystem-level @prepare() for all devices before
77 * starting to invoke suspend callbacks for any of them, so generally
78 * devices may be assumed to be functional or to respond to runtime resume
79 * requests while @prepare() is being executed. However, device drivers
80 * may NOT assume anything about the availability of user space at that
81 * time and it is NOT valid to request firmware from within @prepare()
82 * (it's too late to do that). It also is NOT valid to allocate
83 * substantial amounts of memory from @prepare() in the GFP_KERNEL mode.
84 * [To work around these limitations, drivers may register suspend and
85 * hibernation notifiers to be executed before the freezing of tasks.]
87 * @complete: Undo the changes made by @prepare(). This method is executed for
88 * all kinds of resume transitions, following one of the resume callbacks:
89 * @resume(), @thaw(), @restore(). Also called if the state transition
90 * fails before the driver's suspend callback: @suspend(), @freeze() or
91 * @poweroff(), can be executed (e.g. if the suspend callback fails for one
92 * of the other devices that the PM core has unsuccessfully attempted to
94 * The PM core executes subsystem-level @complete() after it has executed
95 * the appropriate resume callbacks for all devices. If the corresponding
96 * @prepare() at the beginning of the suspend transition returned a
97 * positive number and the device was left in runtime suspend (without
98 * executing any suspend and resume callbacks for it), @complete() will be
99 * the only callback executed for the device during resume. In that case,
100 * @complete() must be prepared to do whatever is necessary to ensure the
101 * proper functioning of the device after the system resume. To this end,
102 * @complete() can check the power.direct_complete flag of the device to
103 * learn whether (unset) or not (set) the previous suspend and resume
104 * callbacks have been executed for it.
106 * @suspend: Executed before putting the system into a sleep state in which the
107 * contents of main memory are preserved. The exact action to perform
108 * depends on the device's subsystem (PM domain, device type, class or bus
109 * type), but generally the device must be quiescent after subsystem-level
110 * @suspend() has returned, so that it doesn't do any I/O or DMA.
111 * Subsystem-level @suspend() is executed for all devices after invoking
112 * subsystem-level @prepare() for all of them.
114 * @suspend_late: Continue operations started by @suspend(). For a number of
115 * devices @suspend_late() may point to the same callback routine as the
116 * runtime suspend callback.
118 * @resume: Executed after waking the system up from a sleep state in which the
119 * contents of main memory were preserved. The exact action to perform
120 * depends on the device's subsystem, but generally the driver is expected
121 * to start working again, responding to hardware events and software
122 * requests (the device itself may be left in a low-power state, waiting
123 * for a runtime resume to occur). The state of the device at the time its
124 * driver's @resume() callback is run depends on the platform and subsystem
125 * the device belongs to. On most platforms, there are no restrictions on
126 * availability of resources like clocks during @resume().
127 * Subsystem-level @resume() is executed for all devices after invoking
128 * subsystem-level @resume_noirq() for all of them.
130 * @resume_early: Prepare to execute @resume(). For a number of devices
131 * @resume_early() may point to the same callback routine as the runtime
134 * @freeze: Hibernation-specific, executed before creating a hibernation image.
135 * Analogous to @suspend(), but it should not enable the device to signal
136 * wakeup events or change its power state. The majority of subsystems
137 * (with the notable exception of the PCI bus type) expect the driver-level
138 * @freeze() to save the device settings in memory to be used by @restore()
139 * during the subsequent resume from hibernation.
140 * Subsystem-level @freeze() is executed for all devices after invoking
141 * subsystem-level @prepare() for all of them.
143 * @freeze_late: Continue operations started by @freeze(). Analogous to
144 * @suspend_late(), but it should not enable the device to signal wakeup
145 * events or change its power state.
147 * @thaw: Hibernation-specific, executed after creating a hibernation image OR
148 * if the creation of an image has failed. Also executed after a failing
149 * attempt to restore the contents of main memory from such an image.
150 * Undo the changes made by the preceding @freeze(), so the device can be
151 * operated in the same way as immediately before the call to @freeze().
152 * Subsystem-level @thaw() is executed for all devices after invoking
153 * subsystem-level @thaw_noirq() for all of them. It also may be executed
154 * directly after @freeze() in case of a transition error.
156 * @thaw_early: Prepare to execute @thaw(). Undo the changes made by the
157 * preceding @freeze_late().
159 * @poweroff: Hibernation-specific, executed after saving a hibernation image.
160 * Analogous to @suspend(), but it need not save the device's settings in
162 * Subsystem-level @poweroff() is executed for all devices after invoking
163 * subsystem-level @prepare() for all of them.
165 * @poweroff_late: Continue operations started by @poweroff(). Analogous to
166 * @suspend_late(), but it need not save the device's settings in memory.
168 * @restore: Hibernation-specific, executed after restoring the contents of main
169 * memory from a hibernation image, analogous to @resume().
171 * @restore_early: Prepare to execute @restore(), analogous to @resume_early().
173 * @suspend_noirq: Complete the actions started by @suspend(). Carry out any
174 * additional operations required for suspending the device that might be
175 * racing with its driver's interrupt handler, which is guaranteed not to
176 * run while @suspend_noirq() is being executed.
177 * It generally is expected that the device will be in a low-power state
178 * (appropriate for the target system sleep state) after subsystem-level
179 * @suspend_noirq() has returned successfully. If the device can generate
180 * system wakeup signals and is enabled to wake up the system, it should be
181 * configured to do so at that time. However, depending on the platform
182 * and device's subsystem, @suspend() or @suspend_late() may be allowed to
183 * put the device into the low-power state and configure it to generate
184 * wakeup signals, in which case it generally is not necessary to define
187 * @resume_noirq: Prepare for the execution of @resume() by carrying out any
188 * operations required for resuming the device that might be racing with
189 * its driver's interrupt handler, which is guaranteed not to run while
190 * @resume_noirq() is being executed.
192 * @freeze_noirq: Complete the actions started by @freeze(). Carry out any
193 * additional operations required for freezing the device that might be
194 * racing with its driver's interrupt handler, which is guaranteed not to
195 * run while @freeze_noirq() is being executed.
196 * The power state of the device should not be changed by either @freeze(),
197 * or @freeze_late(), or @freeze_noirq() and it should not be configured to
198 * signal system wakeup by any of these callbacks.
200 * @thaw_noirq: Prepare for the execution of @thaw() by carrying out any
201 * operations required for thawing the device that might be racing with its
202 * driver's interrupt handler, which is guaranteed not to run while
203 * @thaw_noirq() is being executed.
205 * @poweroff_noirq: Complete the actions started by @poweroff(). Analogous to
206 * @suspend_noirq(), but it need not save the device's settings in memory.
208 * @restore_noirq: Prepare for the execution of @restore() by carrying out any
209 * operations required for thawing the device that might be racing with its
210 * driver's interrupt handler, which is guaranteed not to run while
211 * @restore_noirq() is being executed. Analogous to @resume_noirq().
213 * @runtime_suspend: Prepare the device for a condition in which it won't be
214 * able to communicate with the CPU(s) and RAM due to power management.
215 * This need not mean that the device should be put into a low-power state.
216 * For example, if the device is behind a link which is about to be turned
217 * off, the device may remain at full power. If the device does go to low
218 * power and is capable of generating runtime wakeup events, remote wakeup
219 * (i.e., a hardware mechanism allowing the device to request a change of
220 * its power state via an interrupt) should be enabled for it.
222 * @runtime_resume: Put the device into the fully active state in response to a
223 * wakeup event generated by hardware or at the request of software. If
224 * necessary, put the device into the full-power state and restore its
225 * registers, so that it is fully operational.
227 * @runtime_idle: Device appears to be inactive and it might be put into a
228 * low-power state if all of the necessary conditions are satisfied.
229 * Check these conditions, and return 0 if it's appropriate to let the PM
230 * core queue a suspend request for the device.
232 * Several device power state transitions are externally visible, affecting
233 * the state of pending I/O queues and (for drivers that touch hardware)
234 * interrupts, wakeups, DMA, and other hardware state. There may also be
235 * internal transitions to various low-power modes which are transparent
236 * to the rest of the driver stack (such as a driver that's ON gating off
237 * clocks which are not in active use).
239 * The externally visible transitions are handled with the help of callbacks
240 * included in this structure in such a way that, typically, two levels of
241 * callbacks are involved. First, the PM core executes callbacks provided by PM
242 * domains, device types, classes and bus types. They are the subsystem-level
243 * callbacks expected to execute callbacks provided by device drivers, although
244 * they may choose not to do that. If the driver callbacks are executed, they
245 * have to collaborate with the subsystem-level callbacks to achieve the goals
246 * appropriate for the given system transition, given transition phase and the
247 * subsystem the device belongs to.
249 * All of the above callbacks, except for @complete(), return error codes.
250 * However, the error codes returned by @resume(), @thaw(), @restore(),
251 * @resume_noirq(), @thaw_noirq(), and @restore_noirq(), do not cause the PM
252 * core to abort the resume transition during which they are returned. The
253 * error codes returned in those cases are only printed to the system logs for
254 * debugging purposes. Still, it is recommended that drivers only return error
255 * codes from their resume methods in case of an unrecoverable failure (i.e.
256 * when the device being handled refuses to resume and becomes unusable) to
257 * allow the PM core to be modified in the future, so that it can avoid
258 * attempting to handle devices that failed to resume and their children.
260 * It is allowed to unregister devices while the above callbacks are being
261 * executed. However, a callback routine MUST NOT try to unregister the device
262 * it was called for, although it may unregister children of that device (for
263 * example, if it detects that a child was unplugged while the system was
266 * There also are callbacks related to runtime power management of devices.
267 * Again, as a rule these callbacks are executed by the PM core for subsystems
268 * (PM domains, device types, classes and bus types) and the subsystem-level
269 * callbacks are expected to invoke the driver callbacks. Moreover, the exact
270 * actions to be performed by a device driver's callbacks generally depend on
271 * the platform and subsystem the device belongs to.
273 * Refer to Documentation/power/runtime_pm.rst for more information about the
274 * role of the @runtime_suspend(), @runtime_resume() and @runtime_idle()
275 * callbacks in device runtime power management.
278 int (*prepare)(struct device *dev);
279 void (*complete)(struct device *dev);
280 int (*suspend)(struct device *dev);
281 int (*resume)(struct device *dev);
282 int (*freeze)(struct device *dev);
283 int (*thaw)(struct device *dev);
284 int (*poweroff)(struct device *dev);
285 int (*restore)(struct device *dev);
286 int (*suspend_late)(struct device *dev);
287 int (*resume_early)(struct device *dev);
288 int (*freeze_late)(struct device *dev);
289 int (*thaw_early)(struct device *dev);
290 int (*poweroff_late)(struct device *dev);
291 int (*restore_early)(struct device *dev);
292 int (*suspend_noirq)(struct device *dev);
293 int (*resume_noirq)(struct device *dev);
294 int (*freeze_noirq)(struct device *dev);
295 int (*thaw_noirq)(struct device *dev);
296 int (*poweroff_noirq)(struct device *dev);
297 int (*restore_noirq)(struct device *dev);
298 int (*runtime_suspend)(struct device *dev);
299 int (*runtime_resume)(struct device *dev);
300 int (*runtime_idle)(struct device *dev);
303 #define SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
304 .suspend = pm_sleep_ptr(suspend_fn), \
305 .resume = pm_sleep_ptr(resume_fn), \
306 .freeze = pm_sleep_ptr(suspend_fn), \
307 .thaw = pm_sleep_ptr(resume_fn), \
308 .poweroff = pm_sleep_ptr(suspend_fn), \
309 .restore = pm_sleep_ptr(resume_fn),
311 #define LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
312 .suspend_late = pm_sleep_ptr(suspend_fn), \
313 .resume_early = pm_sleep_ptr(resume_fn), \
314 .freeze_late = pm_sleep_ptr(suspend_fn), \
315 .thaw_early = pm_sleep_ptr(resume_fn), \
316 .poweroff_late = pm_sleep_ptr(suspend_fn), \
317 .restore_early = pm_sleep_ptr(resume_fn),
319 #define NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
320 .suspend_noirq = pm_sleep_ptr(suspend_fn), \
321 .resume_noirq = pm_sleep_ptr(resume_fn), \
322 .freeze_noirq = pm_sleep_ptr(suspend_fn), \
323 .thaw_noirq = pm_sleep_ptr(resume_fn), \
324 .poweroff_noirq = pm_sleep_ptr(suspend_fn), \
325 .restore_noirq = pm_sleep_ptr(resume_fn),
327 #define RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
328 .runtime_suspend = suspend_fn, \
329 .runtime_resume = resume_fn, \
330 .runtime_idle = idle_fn,
332 #ifdef CONFIG_PM_SLEEP
333 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
334 SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
336 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
339 #ifdef CONFIG_PM_SLEEP
340 #define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
341 LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
343 #define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
346 #ifdef CONFIG_PM_SLEEP
347 #define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
348 NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
350 #define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
354 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
355 RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
357 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
361 * Use this if you want to use the same suspend and resume callbacks for suspend
362 * to RAM and hibernation.
364 #define DEFINE_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
365 static const struct dev_pm_ops name = { \
366 SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
370 * Use this for defining a set of PM operations to be used in all situations
371 * (system suspend, hibernation or runtime PM).
372 * NOTE: In general, system suspend callbacks, .suspend() and .resume(), should
373 * be different from the corresponding runtime PM callbacks, .runtime_suspend(),
374 * and .runtime_resume(), because .runtime_suspend() always works on an already
375 * quiescent device, while .suspend() should assume that the device may be doing
376 * something when it is called (it should ensure that the device will be
377 * quiescent after it has returned). Therefore it's better to point the "late"
378 * suspend and "early" resume callback pointers, .suspend_late() and
379 * .resume_early(), to the same routines as .runtime_suspend() and
380 * .runtime_resume(), respectively (and analogously for hibernation).
382 #define DEFINE_UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
383 static const struct dev_pm_ops name = { \
384 SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
385 RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
388 /* Deprecated. Use DEFINE_SIMPLE_DEV_PM_OPS() instead. */
389 #define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
390 const struct dev_pm_ops __maybe_unused name = { \
391 SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
394 /* Deprecated. Use DEFINE_UNIVERSAL_DEV_PM_OPS() instead. */
395 #define UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
396 const struct dev_pm_ops __maybe_unused name = { \
397 SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
398 SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
401 #define pm_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM), (_ptr))
402 #define pm_sleep_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM_SLEEP), (_ptr))
407 * The following PM_EVENT_ messages are defined for the internal use of the PM
408 * core, in order to provide a mechanism allowing the high level suspend and
409 * hibernation code to convey the necessary information to the device PM core
414 * FREEZE System is going to hibernate, call ->prepare() and ->freeze()
417 * SUSPEND System is going to suspend, call ->prepare() and ->suspend()
420 * HIBERNATE Hibernation image has been saved, call ->prepare() and
421 * ->poweroff() for all devices.
423 * QUIESCE Contents of main memory are going to be restored from a (loaded)
424 * hibernation image, call ->prepare() and ->freeze() for all
427 * RESUME System is resuming, call ->resume() and ->complete() for all
430 * THAW Hibernation image has been created, call ->thaw() and
431 * ->complete() for all devices.
433 * RESTORE Contents of main memory have been restored from a hibernation
434 * image, call ->restore() and ->complete() for all devices.
436 * RECOVER Creation of a hibernation image or restoration of the main
437 * memory contents from a hibernation image has failed, call
438 * ->thaw() and ->complete() for all devices.
440 * The following PM_EVENT_ messages are defined for internal use by
441 * kernel subsystems. They are never issued by the PM core.
443 * USER_SUSPEND Manual selective suspend was issued by userspace.
445 * USER_RESUME Manual selective resume was issued by userspace.
447 * REMOTE_WAKEUP Remote-wakeup request was received from the device.
449 * AUTO_SUSPEND Automatic (device idle) runtime suspend was
450 * initiated by the subsystem.
452 * AUTO_RESUME Automatic (device needed) runtime resume was
453 * requested by a driver.
456 #define PM_EVENT_INVALID (-1)
457 #define PM_EVENT_ON 0x0000
458 #define PM_EVENT_FREEZE 0x0001
459 #define PM_EVENT_SUSPEND 0x0002
460 #define PM_EVENT_HIBERNATE 0x0004
461 #define PM_EVENT_QUIESCE 0x0008
462 #define PM_EVENT_RESUME 0x0010
463 #define PM_EVENT_THAW 0x0020
464 #define PM_EVENT_RESTORE 0x0040
465 #define PM_EVENT_RECOVER 0x0080
466 #define PM_EVENT_USER 0x0100
467 #define PM_EVENT_REMOTE 0x0200
468 #define PM_EVENT_AUTO 0x0400
470 #define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
471 #define PM_EVENT_USER_SUSPEND (PM_EVENT_USER | PM_EVENT_SUSPEND)
472 #define PM_EVENT_USER_RESUME (PM_EVENT_USER | PM_EVENT_RESUME)
473 #define PM_EVENT_REMOTE_RESUME (PM_EVENT_REMOTE | PM_EVENT_RESUME)
474 #define PM_EVENT_AUTO_SUSPEND (PM_EVENT_AUTO | PM_EVENT_SUSPEND)
475 #define PM_EVENT_AUTO_RESUME (PM_EVENT_AUTO | PM_EVENT_RESUME)
477 #define PMSG_INVALID ((struct pm_message){ .event = PM_EVENT_INVALID, })
478 #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
479 #define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
480 #define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
481 #define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
482 #define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
483 #define PMSG_RESUME ((struct pm_message){ .event = PM_EVENT_RESUME, })
484 #define PMSG_THAW ((struct pm_message){ .event = PM_EVENT_THAW, })
485 #define PMSG_RESTORE ((struct pm_message){ .event = PM_EVENT_RESTORE, })
486 #define PMSG_RECOVER ((struct pm_message){ .event = PM_EVENT_RECOVER, })
487 #define PMSG_USER_SUSPEND ((struct pm_message) \
488 { .event = PM_EVENT_USER_SUSPEND, })
489 #define PMSG_USER_RESUME ((struct pm_message) \
490 { .event = PM_EVENT_USER_RESUME, })
491 #define PMSG_REMOTE_RESUME ((struct pm_message) \
492 { .event = PM_EVENT_REMOTE_RESUME, })
493 #define PMSG_AUTO_SUSPEND ((struct pm_message) \
494 { .event = PM_EVENT_AUTO_SUSPEND, })
495 #define PMSG_AUTO_RESUME ((struct pm_message) \
496 { .event = PM_EVENT_AUTO_RESUME, })
498 #define PMSG_IS_AUTO(msg) (((msg).event & PM_EVENT_AUTO) != 0)
501 * Device run-time power management status.
503 * These status labels are used internally by the PM core to indicate the
504 * current status of a device with respect to the PM core operations. They do
505 * not reflect the actual power state of the device or its status as seen by the
508 * RPM_ACTIVE Device is fully operational. Indicates that the device
509 * bus type's ->runtime_resume() callback has completed
512 * RPM_SUSPENDED Device bus type's ->runtime_suspend() callback has
513 * completed successfully. The device is regarded as
516 * RPM_RESUMING Device bus type's ->runtime_resume() callback is being
519 * RPM_SUSPENDING Device bus type's ->runtime_suspend() callback is being
532 * Device run-time power management request types.
534 * RPM_REQ_NONE Do nothing.
536 * RPM_REQ_IDLE Run the device bus type's ->runtime_idle() callback
538 * RPM_REQ_SUSPEND Run the device bus type's ->runtime_suspend() callback
540 * RPM_REQ_AUTOSUSPEND Same as RPM_REQ_SUSPEND, but not until the device has
541 * been inactive for as long as power.autosuspend_delay
543 * RPM_REQ_RESUME Run the device bus type's ->runtime_resume() callback
554 struct wakeup_source;
556 struct pm_domain_data;
558 struct pm_subsys_data {
560 unsigned int refcount;
562 unsigned int clock_op_might_sleep;
563 struct mutex clock_mutex;
564 struct list_head clock_list;
566 #ifdef CONFIG_PM_GENERIC_DOMAINS
567 struct pm_domain_data *domain_data;
572 * Driver flags to control system suspend/resume behavior.
574 * These flags can be set by device drivers at the probe time. They need not be
575 * cleared by the drivers as the driver core will take care of that.
577 * NO_DIRECT_COMPLETE: Do not apply direct-complete optimization to the device.
578 * SMART_PREPARE: Take the driver ->prepare callback return value into account.
579 * SMART_SUSPEND: Avoid resuming the device from runtime suspend.
580 * MAY_SKIP_RESUME: Allow driver "noirq" and "early" callbacks to be skipped.
582 * See Documentation/driver-api/pm/devices.rst for details.
584 #define DPM_FLAG_NO_DIRECT_COMPLETE BIT(0)
585 #define DPM_FLAG_SMART_PREPARE BIT(1)
586 #define DPM_FLAG_SMART_SUSPEND BIT(2)
587 #define DPM_FLAG_MAY_SKIP_RESUME BIT(3)
590 pm_message_t power_state;
591 unsigned int can_wakeup:1;
592 unsigned int async_suspend:1;
593 bool in_dpm_list:1; /* Owned by the PM core */
594 bool is_prepared:1; /* Owned by the PM core */
595 bool is_suspended:1; /* Ditto */
596 bool is_noirq_suspended:1;
597 bool is_late_suspended:1;
599 bool early_init:1; /* Owned by the PM core */
600 bool direct_complete:1; /* Owned by the PM core */
603 #ifdef CONFIG_PM_SLEEP
604 struct list_head entry;
605 struct completion completion;
606 struct wakeup_source *wakeup;
609 bool no_pm_callbacks:1; /* Owned by the PM core */
610 unsigned int must_resume:1; /* Owned by the PM core */
611 unsigned int may_skip_resume:1; /* Set by subsystems */
613 unsigned int should_wakeup:1;
616 struct hrtimer suspend_timer;
618 struct work_struct work;
619 wait_queue_head_t wait_queue;
620 struct wake_irq *wakeirq;
621 atomic_t usage_count;
622 atomic_t child_count;
623 unsigned int disable_depth:3;
624 unsigned int idle_notification:1;
625 unsigned int request_pending:1;
626 unsigned int deferred_resume:1;
627 unsigned int needs_force_resume:1;
628 unsigned int runtime_auto:1;
629 bool ignore_children:1;
630 unsigned int no_callbacks:1;
631 unsigned int irq_safe:1;
632 unsigned int use_autosuspend:1;
633 unsigned int timer_autosuspends:1;
634 unsigned int memalloc_noio:1;
635 unsigned int links_count;
636 enum rpm_request request;
637 enum rpm_status runtime_status;
638 enum rpm_status last_status;
640 int autosuspend_delay;
644 u64 accounting_timestamp;
646 struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
647 void (*set_latency_tolerance)(struct device *, s32);
648 struct dev_pm_qos *qos;
651 extern int dev_pm_get_subsys_data(struct device *dev);
652 extern void dev_pm_put_subsys_data(struct device *dev);
655 * struct dev_pm_domain - power management domain representation.
657 * @ops: Power management operations associated with this domain.
658 * @start: Called when a user needs to start the device via the domain.
659 * @detach: Called when removing a device from the domain.
660 * @activate: Called before executing probe routines for bus types and drivers.
661 * @sync: Called after successful driver probe.
662 * @dismiss: Called after unsuccessful driver probe and after driver removal.
664 * Power domains provide callbacks that are executed during system suspend,
665 * hibernation, system resume and during runtime PM transitions instead of
666 * subsystem-level and driver-level callbacks.
668 struct dev_pm_domain {
669 struct dev_pm_ops ops;
670 int (*start)(struct device *dev);
671 void (*detach)(struct device *dev, bool power_off);
672 int (*activate)(struct device *dev);
673 void (*sync)(struct device *dev);
674 void (*dismiss)(struct device *dev);
678 * The PM_EVENT_ messages are also used by drivers implementing the legacy
679 * suspend framework, based on the ->suspend() and ->resume() callbacks common
680 * for suspend and hibernation transitions, according to the rules below.
683 /* Necessary, because several drivers use PM_EVENT_PRETHAW */
684 #define PM_EVENT_PRETHAW PM_EVENT_QUIESCE
687 * One transition is triggered by resume(), after a suspend() call; the
688 * message is implicit:
690 * ON Driver starts working again, responding to hardware events
691 * and software requests. The hardware may have gone through
692 * a power-off reset, or it may have maintained state from the
693 * previous suspend() which the driver will rely on while
694 * resuming. On most platforms, there are no restrictions on
695 * availability of resources like clocks during resume().
697 * Other transitions are triggered by messages sent using suspend(). All
698 * these transitions quiesce the driver, so that I/O queues are inactive.
699 * That commonly entails turning off IRQs and DMA; there may be rules
700 * about how to quiesce that are specific to the bus or the device's type.
701 * (For example, network drivers mark the link state.) Other details may
702 * differ according to the message:
704 * SUSPEND Quiesce, enter a low power device state appropriate for
705 * the upcoming system state (such as PCI_D3hot), and enable
706 * wakeup events as appropriate.
708 * HIBERNATE Enter a low power device state appropriate for the hibernation
709 * state (eg. ACPI S4) and enable wakeup events as appropriate.
711 * FREEZE Quiesce operations so that a consistent image can be saved;
712 * but do NOT otherwise enter a low power device state, and do
713 * NOT emit system wakeup events.
715 * PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
716 * the system from a snapshot taken after an earlier FREEZE.
717 * Some drivers will need to reset their hardware state instead
718 * of preserving it, to ensure that it's never mistaken for the
719 * state which that earlier snapshot had set up.
721 * A minimally power-aware driver treats all messages as SUSPEND, fully
722 * reinitializes its device during resume() -- whether or not it was reset
723 * during the suspend/resume cycle -- and can't issue wakeup events.
725 * More power-aware drivers may also use low power states at runtime as
726 * well as during system sleep states like PM_SUSPEND_STANDBY. They may
727 * be able to use wakeup events to exit from runtime low-power states,
728 * or from system low-power states such as standby or suspend-to-RAM.
731 #ifdef CONFIG_PM_SLEEP
732 extern void device_pm_lock(void);
733 extern void dpm_resume_start(pm_message_t state);
734 extern void dpm_resume_end(pm_message_t state);
735 extern void dpm_resume_noirq(pm_message_t state);
736 extern void dpm_resume_early(pm_message_t state);
737 extern void dpm_resume(pm_message_t state);
738 extern void dpm_complete(pm_message_t state);
740 extern void device_pm_unlock(void);
741 extern int dpm_suspend_end(pm_message_t state);
742 extern int dpm_suspend_start(pm_message_t state);
743 extern int dpm_suspend_noirq(pm_message_t state);
744 extern int dpm_suspend_late(pm_message_t state);
745 extern int dpm_suspend(pm_message_t state);
746 extern int dpm_prepare(pm_message_t state);
748 extern void __suspend_report_result(const char *function, void *fn, int ret);
750 #define suspend_report_result(fn, ret) \
752 __suspend_report_result(__func__, fn, ret); \
755 extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
756 extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *));
758 extern int pm_generic_prepare(struct device *dev);
759 extern int pm_generic_suspend_late(struct device *dev);
760 extern int pm_generic_suspend_noirq(struct device *dev);
761 extern int pm_generic_suspend(struct device *dev);
762 extern int pm_generic_resume_early(struct device *dev);
763 extern int pm_generic_resume_noirq(struct device *dev);
764 extern int pm_generic_resume(struct device *dev);
765 extern int pm_generic_freeze_noirq(struct device *dev);
766 extern int pm_generic_freeze_late(struct device *dev);
767 extern int pm_generic_freeze(struct device *dev);
768 extern int pm_generic_thaw_noirq(struct device *dev);
769 extern int pm_generic_thaw_early(struct device *dev);
770 extern int pm_generic_thaw(struct device *dev);
771 extern int pm_generic_restore_noirq(struct device *dev);
772 extern int pm_generic_restore_early(struct device *dev);
773 extern int pm_generic_restore(struct device *dev);
774 extern int pm_generic_poweroff_noirq(struct device *dev);
775 extern int pm_generic_poweroff_late(struct device *dev);
776 extern int pm_generic_poweroff(struct device *dev);
777 extern void pm_generic_complete(struct device *dev);
779 extern bool dev_pm_skip_resume(struct device *dev);
780 extern bool dev_pm_skip_suspend(struct device *dev);
782 #else /* !CONFIG_PM_SLEEP */
784 #define device_pm_lock() do {} while (0)
785 #define device_pm_unlock() do {} while (0)
787 static inline int dpm_suspend_start(pm_message_t state)
792 #define suspend_report_result(fn, ret) do {} while (0)
794 static inline int device_pm_wait_for_dev(struct device *a, struct device *b)
799 static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
803 #define pm_generic_prepare NULL
804 #define pm_generic_suspend_late NULL
805 #define pm_generic_suspend_noirq NULL
806 #define pm_generic_suspend NULL
807 #define pm_generic_resume_early NULL
808 #define pm_generic_resume_noirq NULL
809 #define pm_generic_resume NULL
810 #define pm_generic_freeze_noirq NULL
811 #define pm_generic_freeze_late NULL
812 #define pm_generic_freeze NULL
813 #define pm_generic_thaw_noirq NULL
814 #define pm_generic_thaw_early NULL
815 #define pm_generic_thaw NULL
816 #define pm_generic_restore_noirq NULL
817 #define pm_generic_restore_early NULL
818 #define pm_generic_restore NULL
819 #define pm_generic_poweroff_noirq NULL
820 #define pm_generic_poweroff_late NULL
821 #define pm_generic_poweroff NULL
822 #define pm_generic_complete NULL
823 #endif /* !CONFIG_PM_SLEEP */
825 /* How to reorder dpm_list after device_move() */
828 DPM_ORDER_DEV_AFTER_PARENT,
829 DPM_ORDER_PARENT_BEFORE_DEV,
833 #endif /* _LINUX_PM_H */