1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * pm.h - Power management interface
5 * Copyright (C) 2000 Andrew Henroid
11 #include <linux/export.h>
12 #include <linux/list.h>
13 #include <linux/workqueue.h>
14 #include <linux/spinlock.h>
15 #include <linux/wait.h>
16 #include <linux/timer.h>
17 #include <linux/hrtimer.h>
18 #include <linux/completion.h>
21 * Callbacks for platform drivers to implement.
23 extern void (*pm_power_off)(void);
24 extern void (*pm_power_off_prepare)(void);
26 struct device; /* we have a circular dep with device.h */
27 #ifdef CONFIG_VT_CONSOLE_SLEEP
28 extern void pm_vt_switch_required(struct device *dev, bool required);
29 extern void pm_vt_switch_unregister(struct device *dev);
31 static inline void pm_vt_switch_required(struct device *dev, bool required)
34 static inline void pm_vt_switch_unregister(struct device *dev)
37 #endif /* CONFIG_VT_CONSOLE_SLEEP */
40 * Device power management
45 extern const char power_group_name[]; /* = "power" */
47 #define power_group_name NULL
50 typedef struct pm_message {
55 * struct dev_pm_ops - device PM callbacks.
57 * @prepare: The principal role of this callback is to prevent new children of
58 * the device from being registered after it has returned (the driver's
59 * subsystem and generally the rest of the kernel is supposed to prevent
60 * new calls to the probe method from being made too once @prepare() has
61 * succeeded). If @prepare() detects a situation it cannot handle (e.g.
62 * registration of a child already in progress), it may return -EAGAIN, so
63 * that the PM core can execute it once again (e.g. after a new child has
64 * been registered) to recover from the race condition.
65 * This method is executed for all kinds of suspend transitions and is
66 * followed by one of the suspend callbacks: @suspend(), @freeze(), or
67 * @poweroff(). If the transition is a suspend to memory or standby (that
68 * is, not related to hibernation), the return value of @prepare() may be
69 * used to indicate to the PM core to leave the device in runtime suspend
70 * if applicable. Namely, if @prepare() returns a positive number, the PM
71 * core will understand that as a declaration that the device appears to be
72 * runtime-suspended and it may be left in that state during the entire
73 * transition and during the subsequent resume if all of its descendants
74 * are left in runtime suspend too. If that happens, @complete() will be
75 * executed directly after @prepare() and it must ensure the proper
76 * functioning of the device after the system resume.
77 * The PM core executes subsystem-level @prepare() for all devices before
78 * starting to invoke suspend callbacks for any of them, so generally
79 * devices may be assumed to be functional or to respond to runtime resume
80 * requests while @prepare() is being executed. However, device drivers
81 * may NOT assume anything about the availability of user space at that
82 * time and it is NOT valid to request firmware from within @prepare()
83 * (it's too late to do that). It also is NOT valid to allocate
84 * substantial amounts of memory from @prepare() in the GFP_KERNEL mode.
85 * [To work around these limitations, drivers may register suspend and
86 * hibernation notifiers to be executed before the freezing of tasks.]
88 * @complete: Undo the changes made by @prepare(). This method is executed for
89 * all kinds of resume transitions, following one of the resume callbacks:
90 * @resume(), @thaw(), @restore(). Also called if the state transition
91 * fails before the driver's suspend callback: @suspend(), @freeze() or
92 * @poweroff(), can be executed (e.g. if the suspend callback fails for one
93 * of the other devices that the PM core has unsuccessfully attempted to
95 * The PM core executes subsystem-level @complete() after it has executed
96 * the appropriate resume callbacks for all devices. If the corresponding
97 * @prepare() at the beginning of the suspend transition returned a
98 * positive number and the device was left in runtime suspend (without
99 * executing any suspend and resume callbacks for it), @complete() will be
100 * the only callback executed for the device during resume. In that case,
101 * @complete() must be prepared to do whatever is necessary to ensure the
102 * proper functioning of the device after the system resume. To this end,
103 * @complete() can check the power.direct_complete flag of the device to
104 * learn whether (unset) or not (set) the previous suspend and resume
105 * callbacks have been executed for it.
107 * @suspend: Executed before putting the system into a sleep state in which the
108 * contents of main memory are preserved. The exact action to perform
109 * depends on the device's subsystem (PM domain, device type, class or bus
110 * type), but generally the device must be quiescent after subsystem-level
111 * @suspend() has returned, so that it doesn't do any I/O or DMA.
112 * Subsystem-level @suspend() is executed for all devices after invoking
113 * subsystem-level @prepare() for all of them.
115 * @suspend_late: Continue operations started by @suspend(). For a number of
116 * devices @suspend_late() may point to the same callback routine as the
117 * runtime suspend callback.
119 * @resume: Executed after waking the system up from a sleep state in which the
120 * contents of main memory were preserved. The exact action to perform
121 * depends on the device's subsystem, but generally the driver is expected
122 * to start working again, responding to hardware events and software
123 * requests (the device itself may be left in a low-power state, waiting
124 * for a runtime resume to occur). The state of the device at the time its
125 * driver's @resume() callback is run depends on the platform and subsystem
126 * the device belongs to. On most platforms, there are no restrictions on
127 * availability of resources like clocks during @resume().
128 * Subsystem-level @resume() is executed for all devices after invoking
129 * subsystem-level @resume_noirq() for all of them.
131 * @resume_early: Prepare to execute @resume(). For a number of devices
132 * @resume_early() may point to the same callback routine as the runtime
135 * @freeze: Hibernation-specific, executed before creating a hibernation image.
136 * Analogous to @suspend(), but it should not enable the device to signal
137 * wakeup events or change its power state. The majority of subsystems
138 * (with the notable exception of the PCI bus type) expect the driver-level
139 * @freeze() to save the device settings in memory to be used by @restore()
140 * during the subsequent resume from hibernation.
141 * Subsystem-level @freeze() is executed for all devices after invoking
142 * subsystem-level @prepare() for all of them.
144 * @freeze_late: Continue operations started by @freeze(). Analogous to
145 * @suspend_late(), but it should not enable the device to signal wakeup
146 * events or change its power state.
148 * @thaw: Hibernation-specific, executed after creating a hibernation image OR
149 * if the creation of an image has failed. Also executed after a failing
150 * attempt to restore the contents of main memory from such an image.
151 * Undo the changes made by the preceding @freeze(), so the device can be
152 * operated in the same way as immediately before the call to @freeze().
153 * Subsystem-level @thaw() is executed for all devices after invoking
154 * subsystem-level @thaw_noirq() for all of them. It also may be executed
155 * directly after @freeze() in case of a transition error.
157 * @thaw_early: Prepare to execute @thaw(). Undo the changes made by the
158 * preceding @freeze_late().
160 * @poweroff: Hibernation-specific, executed after saving a hibernation image.
161 * Analogous to @suspend(), but it need not save the device's settings in
163 * Subsystem-level @poweroff() is executed for all devices after invoking
164 * subsystem-level @prepare() for all of them.
166 * @poweroff_late: Continue operations started by @poweroff(). Analogous to
167 * @suspend_late(), but it need not save the device's settings in memory.
169 * @restore: Hibernation-specific, executed after restoring the contents of main
170 * memory from a hibernation image, analogous to @resume().
172 * @restore_early: Prepare to execute @restore(), analogous to @resume_early().
174 * @suspend_noirq: Complete the actions started by @suspend(). Carry out any
175 * additional operations required for suspending the device that might be
176 * racing with its driver's interrupt handler, which is guaranteed not to
177 * run while @suspend_noirq() is being executed.
178 * It generally is expected that the device will be in a low-power state
179 * (appropriate for the target system sleep state) after subsystem-level
180 * @suspend_noirq() has returned successfully. If the device can generate
181 * system wakeup signals and is enabled to wake up the system, it should be
182 * configured to do so at that time. However, depending on the platform
183 * and device's subsystem, @suspend() or @suspend_late() may be allowed to
184 * put the device into the low-power state and configure it to generate
185 * wakeup signals, in which case it generally is not necessary to define
188 * @resume_noirq: Prepare for the execution of @resume() by carrying out any
189 * operations required for resuming the device that might be racing with
190 * its driver's interrupt handler, which is guaranteed not to run while
191 * @resume_noirq() is being executed.
193 * @freeze_noirq: Complete the actions started by @freeze(). Carry out any
194 * additional operations required for freezing the device that might be
195 * racing with its driver's interrupt handler, which is guaranteed not to
196 * run while @freeze_noirq() is being executed.
197 * The power state of the device should not be changed by either @freeze(),
198 * or @freeze_late(), or @freeze_noirq() and it should not be configured to
199 * signal system wakeup by any of these callbacks.
201 * @thaw_noirq: Prepare for the execution of @thaw() by carrying out any
202 * operations required for thawing the device that might be racing with its
203 * driver's interrupt handler, which is guaranteed not to run while
204 * @thaw_noirq() is being executed.
206 * @poweroff_noirq: Complete the actions started by @poweroff(). Analogous to
207 * @suspend_noirq(), but it need not save the device's settings in memory.
209 * @restore_noirq: Prepare for the execution of @restore() by carrying out any
210 * operations required for thawing the device that might be racing with its
211 * driver's interrupt handler, which is guaranteed not to run while
212 * @restore_noirq() is being executed. Analogous to @resume_noirq().
214 * @runtime_suspend: Prepare the device for a condition in which it won't be
215 * able to communicate with the CPU(s) and RAM due to power management.
216 * This need not mean that the device should be put into a low-power state.
217 * For example, if the device is behind a link which is about to be turned
218 * off, the device may remain at full power. If the device does go to low
219 * power and is capable of generating runtime wakeup events, remote wakeup
220 * (i.e., a hardware mechanism allowing the device to request a change of
221 * its power state via an interrupt) should be enabled for it.
223 * @runtime_resume: Put the device into the fully active state in response to a
224 * wakeup event generated by hardware or at the request of software. If
225 * necessary, put the device into the full-power state and restore its
226 * registers, so that it is fully operational.
228 * @runtime_idle: Device appears to be inactive and it might be put into a
229 * low-power state if all of the necessary conditions are satisfied.
230 * Check these conditions, and return 0 if it's appropriate to let the PM
231 * core queue a suspend request for the device.
233 * Several device power state transitions are externally visible, affecting
234 * the state of pending I/O queues and (for drivers that touch hardware)
235 * interrupts, wakeups, DMA, and other hardware state. There may also be
236 * internal transitions to various low-power modes which are transparent
237 * to the rest of the driver stack (such as a driver that's ON gating off
238 * clocks which are not in active use).
240 * The externally visible transitions are handled with the help of callbacks
241 * included in this structure in such a way that, typically, two levels of
242 * callbacks are involved. First, the PM core executes callbacks provided by PM
243 * domains, device types, classes and bus types. They are the subsystem-level
244 * callbacks expected to execute callbacks provided by device drivers, although
245 * they may choose not to do that. If the driver callbacks are executed, they
246 * have to collaborate with the subsystem-level callbacks to achieve the goals
247 * appropriate for the given system transition, given transition phase and the
248 * subsystem the device belongs to.
250 * All of the above callbacks, except for @complete(), return error codes.
251 * However, the error codes returned by @resume(), @thaw(), @restore(),
252 * @resume_noirq(), @thaw_noirq(), and @restore_noirq(), do not cause the PM
253 * core to abort the resume transition during which they are returned. The
254 * error codes returned in those cases are only printed to the system logs for
255 * debugging purposes. Still, it is recommended that drivers only return error
256 * codes from their resume methods in case of an unrecoverable failure (i.e.
257 * when the device being handled refuses to resume and becomes unusable) to
258 * allow the PM core to be modified in the future, so that it can avoid
259 * attempting to handle devices that failed to resume and their children.
261 * It is allowed to unregister devices while the above callbacks are being
262 * executed. However, a callback routine MUST NOT try to unregister the device
263 * it was called for, although it may unregister children of that device (for
264 * example, if it detects that a child was unplugged while the system was
267 * There also are callbacks related to runtime power management of devices.
268 * Again, as a rule these callbacks are executed by the PM core for subsystems
269 * (PM domains, device types, classes and bus types) and the subsystem-level
270 * callbacks are expected to invoke the driver callbacks. Moreover, the exact
271 * actions to be performed by a device driver's callbacks generally depend on
272 * the platform and subsystem the device belongs to.
274 * Refer to Documentation/power/runtime_pm.rst for more information about the
275 * role of the @runtime_suspend(), @runtime_resume() and @runtime_idle()
276 * callbacks in device runtime power management.
279 int (*prepare)(struct device *dev);
280 void (*complete)(struct device *dev);
281 int (*suspend)(struct device *dev);
282 int (*resume)(struct device *dev);
283 int (*freeze)(struct device *dev);
284 int (*thaw)(struct device *dev);
285 int (*poweroff)(struct device *dev);
286 int (*restore)(struct device *dev);
287 int (*suspend_late)(struct device *dev);
288 int (*resume_early)(struct device *dev);
289 int (*freeze_late)(struct device *dev);
290 int (*thaw_early)(struct device *dev);
291 int (*poweroff_late)(struct device *dev);
292 int (*restore_early)(struct device *dev);
293 int (*suspend_noirq)(struct device *dev);
294 int (*resume_noirq)(struct device *dev);
295 int (*freeze_noirq)(struct device *dev);
296 int (*thaw_noirq)(struct device *dev);
297 int (*poweroff_noirq)(struct device *dev);
298 int (*restore_noirq)(struct device *dev);
299 int (*runtime_suspend)(struct device *dev);
300 int (*runtime_resume)(struct device *dev);
301 int (*runtime_idle)(struct device *dev);
304 #define SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
305 .suspend = pm_sleep_ptr(suspend_fn), \
306 .resume = pm_sleep_ptr(resume_fn), \
307 .freeze = pm_sleep_ptr(suspend_fn), \
308 .thaw = pm_sleep_ptr(resume_fn), \
309 .poweroff = pm_sleep_ptr(suspend_fn), \
310 .restore = pm_sleep_ptr(resume_fn),
312 #define LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
313 .suspend_late = pm_sleep_ptr(suspend_fn), \
314 .resume_early = pm_sleep_ptr(resume_fn), \
315 .freeze_late = pm_sleep_ptr(suspend_fn), \
316 .thaw_early = pm_sleep_ptr(resume_fn), \
317 .poweroff_late = pm_sleep_ptr(suspend_fn), \
318 .restore_early = pm_sleep_ptr(resume_fn),
320 #define NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
321 .suspend_noirq = pm_sleep_ptr(suspend_fn), \
322 .resume_noirq = pm_sleep_ptr(resume_fn), \
323 .freeze_noirq = pm_sleep_ptr(suspend_fn), \
324 .thaw_noirq = pm_sleep_ptr(resume_fn), \
325 .poweroff_noirq = pm_sleep_ptr(suspend_fn), \
326 .restore_noirq = pm_sleep_ptr(resume_fn),
328 #define RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
329 .runtime_suspend = suspend_fn, \
330 .runtime_resume = resume_fn, \
331 .runtime_idle = idle_fn,
333 #ifdef CONFIG_PM_SLEEP
334 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
335 SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
337 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
340 #ifdef CONFIG_PM_SLEEP
341 #define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
342 LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
344 #define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
347 #ifdef CONFIG_PM_SLEEP
348 #define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
349 NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
351 #define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
355 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
356 RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
358 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
361 #define _DEFINE_DEV_PM_OPS(name, \
362 suspend_fn, resume_fn, \
363 runtime_suspend_fn, runtime_resume_fn, idle_fn) \
364 const struct dev_pm_ops name = { \
365 SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
366 RUNTIME_PM_OPS(runtime_suspend_fn, runtime_resume_fn, idle_fn) \
370 #define _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, runtime_suspend_fn, \
371 runtime_resume_fn, idle_fn, sec, ns) \
372 _DEFINE_DEV_PM_OPS(name, suspend_fn, resume_fn, runtime_suspend_fn, \
373 runtime_resume_fn, idle_fn); \
374 __EXPORT_SYMBOL(name, sec, ns)
376 #define _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, runtime_suspend_fn, \
377 runtime_resume_fn, idle_fn, sec, ns) \
378 static __maybe_unused _DEFINE_DEV_PM_OPS(__static_##name, suspend_fn, \
379 resume_fn, runtime_suspend_fn, \
380 runtime_resume_fn, idle_fn)
384 * Use this if you want to use the same suspend and resume callbacks for suspend
385 * to RAM and hibernation.
387 * If the underlying dev_pm_ops struct symbol has to be exported, use
388 * EXPORT_SIMPLE_DEV_PM_OPS() or EXPORT_GPL_SIMPLE_DEV_PM_OPS() instead.
390 #define DEFINE_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
391 _DEFINE_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL)
393 #define EXPORT_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
394 _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "", "")
395 #define EXPORT_GPL_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
396 _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "_gpl", "")
397 #define EXPORT_NS_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn, ns) \
398 _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "", #ns)
399 #define EXPORT_NS_GPL_SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn, ns) \
400 _EXPORT_DEV_PM_OPS(name, suspend_fn, resume_fn, NULL, NULL, NULL, "_gpl", #ns)
402 /* Deprecated. Use DEFINE_SIMPLE_DEV_PM_OPS() instead. */
403 #define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
404 const struct dev_pm_ops __maybe_unused name = { \
405 SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
409 * Use this for defining a set of PM operations to be used in all situations
410 * (system suspend, hibernation or runtime PM).
411 * NOTE: In general, system suspend callbacks, .suspend() and .resume(), should
412 * be different from the corresponding runtime PM callbacks, .runtime_suspend(),
413 * and .runtime_resume(), because .runtime_suspend() always works on an already
414 * quiescent device, while .suspend() should assume that the device may be doing
415 * something when it is called (it should ensure that the device will be
416 * quiescent after it has returned). Therefore it's better to point the "late"
417 * suspend and "early" resume callback pointers, .suspend_late() and
418 * .resume_early(), to the same routines as .runtime_suspend() and
419 * .runtime_resume(), respectively (and analogously for hibernation).
421 * Deprecated. You most likely don't want this macro. Use
422 * DEFINE_RUNTIME_DEV_PM_OPS() instead.
424 #define UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
425 const struct dev_pm_ops __maybe_unused name = { \
426 SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
427 SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
430 #define pm_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM), (_ptr))
431 #define pm_sleep_ptr(_ptr) PTR_IF(IS_ENABLED(CONFIG_PM_SLEEP), (_ptr))
436 * The following PM_EVENT_ messages are defined for the internal use of the PM
437 * core, in order to provide a mechanism allowing the high level suspend and
438 * hibernation code to convey the necessary information to the device PM core
443 * FREEZE System is going to hibernate, call ->prepare() and ->freeze()
446 * SUSPEND System is going to suspend, call ->prepare() and ->suspend()
449 * HIBERNATE Hibernation image has been saved, call ->prepare() and
450 * ->poweroff() for all devices.
452 * QUIESCE Contents of main memory are going to be restored from a (loaded)
453 * hibernation image, call ->prepare() and ->freeze() for all
456 * RESUME System is resuming, call ->resume() and ->complete() for all
459 * THAW Hibernation image has been created, call ->thaw() and
460 * ->complete() for all devices.
462 * RESTORE Contents of main memory have been restored from a hibernation
463 * image, call ->restore() and ->complete() for all devices.
465 * RECOVER Creation of a hibernation image or restoration of the main
466 * memory contents from a hibernation image has failed, call
467 * ->thaw() and ->complete() for all devices.
469 * The following PM_EVENT_ messages are defined for internal use by
470 * kernel subsystems. They are never issued by the PM core.
472 * USER_SUSPEND Manual selective suspend was issued by userspace.
474 * USER_RESUME Manual selective resume was issued by userspace.
476 * REMOTE_WAKEUP Remote-wakeup request was received from the device.
478 * AUTO_SUSPEND Automatic (device idle) runtime suspend was
479 * initiated by the subsystem.
481 * AUTO_RESUME Automatic (device needed) runtime resume was
482 * requested by a driver.
485 #define PM_EVENT_INVALID (-1)
486 #define PM_EVENT_ON 0x0000
487 #define PM_EVENT_FREEZE 0x0001
488 #define PM_EVENT_SUSPEND 0x0002
489 #define PM_EVENT_HIBERNATE 0x0004
490 #define PM_EVENT_QUIESCE 0x0008
491 #define PM_EVENT_RESUME 0x0010
492 #define PM_EVENT_THAW 0x0020
493 #define PM_EVENT_RESTORE 0x0040
494 #define PM_EVENT_RECOVER 0x0080
495 #define PM_EVENT_USER 0x0100
496 #define PM_EVENT_REMOTE 0x0200
497 #define PM_EVENT_AUTO 0x0400
499 #define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
500 #define PM_EVENT_USER_SUSPEND (PM_EVENT_USER | PM_EVENT_SUSPEND)
501 #define PM_EVENT_USER_RESUME (PM_EVENT_USER | PM_EVENT_RESUME)
502 #define PM_EVENT_REMOTE_RESUME (PM_EVENT_REMOTE | PM_EVENT_RESUME)
503 #define PM_EVENT_AUTO_SUSPEND (PM_EVENT_AUTO | PM_EVENT_SUSPEND)
504 #define PM_EVENT_AUTO_RESUME (PM_EVENT_AUTO | PM_EVENT_RESUME)
506 #define PMSG_INVALID ((struct pm_message){ .event = PM_EVENT_INVALID, })
507 #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
508 #define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
509 #define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
510 #define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
511 #define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
512 #define PMSG_RESUME ((struct pm_message){ .event = PM_EVENT_RESUME, })
513 #define PMSG_THAW ((struct pm_message){ .event = PM_EVENT_THAW, })
514 #define PMSG_RESTORE ((struct pm_message){ .event = PM_EVENT_RESTORE, })
515 #define PMSG_RECOVER ((struct pm_message){ .event = PM_EVENT_RECOVER, })
516 #define PMSG_USER_SUSPEND ((struct pm_message) \
517 { .event = PM_EVENT_USER_SUSPEND, })
518 #define PMSG_USER_RESUME ((struct pm_message) \
519 { .event = PM_EVENT_USER_RESUME, })
520 #define PMSG_REMOTE_RESUME ((struct pm_message) \
521 { .event = PM_EVENT_REMOTE_RESUME, })
522 #define PMSG_AUTO_SUSPEND ((struct pm_message) \
523 { .event = PM_EVENT_AUTO_SUSPEND, })
524 #define PMSG_AUTO_RESUME ((struct pm_message) \
525 { .event = PM_EVENT_AUTO_RESUME, })
527 #define PMSG_IS_AUTO(msg) (((msg).event & PM_EVENT_AUTO) != 0)
530 * Device run-time power management status.
532 * These status labels are used internally by the PM core to indicate the
533 * current status of a device with respect to the PM core operations. They do
534 * not reflect the actual power state of the device or its status as seen by the
537 * RPM_ACTIVE Device is fully operational. Indicates that the device
538 * bus type's ->runtime_resume() callback has completed
541 * RPM_SUSPENDED Device bus type's ->runtime_suspend() callback has
542 * completed successfully. The device is regarded as
545 * RPM_RESUMING Device bus type's ->runtime_resume() callback is being
548 * RPM_SUSPENDING Device bus type's ->runtime_suspend() callback is being
561 * Device run-time power management request types.
563 * RPM_REQ_NONE Do nothing.
565 * RPM_REQ_IDLE Run the device bus type's ->runtime_idle() callback
567 * RPM_REQ_SUSPEND Run the device bus type's ->runtime_suspend() callback
569 * RPM_REQ_AUTOSUSPEND Same as RPM_REQ_SUSPEND, but not until the device has
570 * been inactive for as long as power.autosuspend_delay
572 * RPM_REQ_RESUME Run the device bus type's ->runtime_resume() callback
583 struct wakeup_source;
585 struct pm_domain_data;
587 struct pm_subsys_data {
589 unsigned int refcount;
591 unsigned int clock_op_might_sleep;
592 struct mutex clock_mutex;
593 struct list_head clock_list;
595 #ifdef CONFIG_PM_GENERIC_DOMAINS
596 struct pm_domain_data *domain_data;
601 * Driver flags to control system suspend/resume behavior.
603 * These flags can be set by device drivers at the probe time. They need not be
604 * cleared by the drivers as the driver core will take care of that.
606 * NO_DIRECT_COMPLETE: Do not apply direct-complete optimization to the device.
607 * SMART_PREPARE: Take the driver ->prepare callback return value into account.
608 * SMART_SUSPEND: Avoid resuming the device from runtime suspend.
609 * MAY_SKIP_RESUME: Allow driver "noirq" and "early" callbacks to be skipped.
611 * See Documentation/driver-api/pm/devices.rst for details.
613 #define DPM_FLAG_NO_DIRECT_COMPLETE BIT(0)
614 #define DPM_FLAG_SMART_PREPARE BIT(1)
615 #define DPM_FLAG_SMART_SUSPEND BIT(2)
616 #define DPM_FLAG_MAY_SKIP_RESUME BIT(3)
619 pm_message_t power_state;
620 unsigned int can_wakeup:1;
621 unsigned int async_suspend:1;
622 bool in_dpm_list:1; /* Owned by the PM core */
623 bool is_prepared:1; /* Owned by the PM core */
624 bool is_suspended:1; /* Ditto */
625 bool is_noirq_suspended:1;
626 bool is_late_suspended:1;
628 bool early_init:1; /* Owned by the PM core */
629 bool direct_complete:1; /* Owned by the PM core */
632 #ifdef CONFIG_PM_SLEEP
633 struct list_head entry;
634 struct completion completion;
635 struct wakeup_source *wakeup;
638 bool no_pm_callbacks:1; /* Owned by the PM core */
639 unsigned int must_resume:1; /* Owned by the PM core */
640 unsigned int may_skip_resume:1; /* Set by subsystems */
642 unsigned int should_wakeup:1;
645 struct hrtimer suspend_timer;
647 struct work_struct work;
648 wait_queue_head_t wait_queue;
649 struct wake_irq *wakeirq;
650 atomic_t usage_count;
651 atomic_t child_count;
652 unsigned int disable_depth:3;
653 unsigned int idle_notification:1;
654 unsigned int request_pending:1;
655 unsigned int deferred_resume:1;
656 unsigned int needs_force_resume:1;
657 unsigned int runtime_auto:1;
658 bool ignore_children:1;
659 unsigned int no_callbacks:1;
660 unsigned int irq_safe:1;
661 unsigned int use_autosuspend:1;
662 unsigned int timer_autosuspends:1;
663 unsigned int memalloc_noio:1;
664 unsigned int links_count;
665 enum rpm_request request;
666 enum rpm_status runtime_status;
667 enum rpm_status last_status;
669 int autosuspend_delay;
673 u64 accounting_timestamp;
675 struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */
676 void (*set_latency_tolerance)(struct device *, s32);
677 struct dev_pm_qos *qos;
680 extern int dev_pm_get_subsys_data(struct device *dev);
681 extern void dev_pm_put_subsys_data(struct device *dev);
684 * struct dev_pm_domain - power management domain representation.
686 * @ops: Power management operations associated with this domain.
687 * @start: Called when a user needs to start the device via the domain.
688 * @detach: Called when removing a device from the domain.
689 * @activate: Called before executing probe routines for bus types and drivers.
690 * @sync: Called after successful driver probe.
691 * @dismiss: Called after unsuccessful driver probe and after driver removal.
693 * Power domains provide callbacks that are executed during system suspend,
694 * hibernation, system resume and during runtime PM transitions instead of
695 * subsystem-level and driver-level callbacks.
697 struct dev_pm_domain {
698 struct dev_pm_ops ops;
699 int (*start)(struct device *dev);
700 void (*detach)(struct device *dev, bool power_off);
701 int (*activate)(struct device *dev);
702 void (*sync)(struct device *dev);
703 void (*dismiss)(struct device *dev);
707 * The PM_EVENT_ messages are also used by drivers implementing the legacy
708 * suspend framework, based on the ->suspend() and ->resume() callbacks common
709 * for suspend and hibernation transitions, according to the rules below.
712 /* Necessary, because several drivers use PM_EVENT_PRETHAW */
713 #define PM_EVENT_PRETHAW PM_EVENT_QUIESCE
716 * One transition is triggered by resume(), after a suspend() call; the
717 * message is implicit:
719 * ON Driver starts working again, responding to hardware events
720 * and software requests. The hardware may have gone through
721 * a power-off reset, or it may have maintained state from the
722 * previous suspend() which the driver will rely on while
723 * resuming. On most platforms, there are no restrictions on
724 * availability of resources like clocks during resume().
726 * Other transitions are triggered by messages sent using suspend(). All
727 * these transitions quiesce the driver, so that I/O queues are inactive.
728 * That commonly entails turning off IRQs and DMA; there may be rules
729 * about how to quiesce that are specific to the bus or the device's type.
730 * (For example, network drivers mark the link state.) Other details may
731 * differ according to the message:
733 * SUSPEND Quiesce, enter a low power device state appropriate for
734 * the upcoming system state (such as PCI_D3hot), and enable
735 * wakeup events as appropriate.
737 * HIBERNATE Enter a low power device state appropriate for the hibernation
738 * state (eg. ACPI S4) and enable wakeup events as appropriate.
740 * FREEZE Quiesce operations so that a consistent image can be saved;
741 * but do NOT otherwise enter a low power device state, and do
742 * NOT emit system wakeup events.
744 * PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
745 * the system from a snapshot taken after an earlier FREEZE.
746 * Some drivers will need to reset their hardware state instead
747 * of preserving it, to ensure that it's never mistaken for the
748 * state which that earlier snapshot had set up.
750 * A minimally power-aware driver treats all messages as SUSPEND, fully
751 * reinitializes its device during resume() -- whether or not it was reset
752 * during the suspend/resume cycle -- and can't issue wakeup events.
754 * More power-aware drivers may also use low power states at runtime as
755 * well as during system sleep states like PM_SUSPEND_STANDBY. They may
756 * be able to use wakeup events to exit from runtime low-power states,
757 * or from system low-power states such as standby or suspend-to-RAM.
760 #ifdef CONFIG_PM_SLEEP
761 extern void device_pm_lock(void);
762 extern void dpm_resume_start(pm_message_t state);
763 extern void dpm_resume_end(pm_message_t state);
764 extern void dpm_resume_noirq(pm_message_t state);
765 extern void dpm_resume_early(pm_message_t state);
766 extern void dpm_resume(pm_message_t state);
767 extern void dpm_complete(pm_message_t state);
769 extern void device_pm_unlock(void);
770 extern int dpm_suspend_end(pm_message_t state);
771 extern int dpm_suspend_start(pm_message_t state);
772 extern int dpm_suspend_noirq(pm_message_t state);
773 extern int dpm_suspend_late(pm_message_t state);
774 extern int dpm_suspend(pm_message_t state);
775 extern int dpm_prepare(pm_message_t state);
777 extern void __suspend_report_result(const char *function, struct device *dev, void *fn, int ret);
779 #define suspend_report_result(dev, fn, ret) \
781 __suspend_report_result(__func__, dev, fn, ret); \
784 extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
785 extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *));
787 extern int pm_generic_prepare(struct device *dev);
788 extern int pm_generic_suspend_late(struct device *dev);
789 extern int pm_generic_suspend_noirq(struct device *dev);
790 extern int pm_generic_suspend(struct device *dev);
791 extern int pm_generic_resume_early(struct device *dev);
792 extern int pm_generic_resume_noirq(struct device *dev);
793 extern int pm_generic_resume(struct device *dev);
794 extern int pm_generic_freeze_noirq(struct device *dev);
795 extern int pm_generic_freeze_late(struct device *dev);
796 extern int pm_generic_freeze(struct device *dev);
797 extern int pm_generic_thaw_noirq(struct device *dev);
798 extern int pm_generic_thaw_early(struct device *dev);
799 extern int pm_generic_thaw(struct device *dev);
800 extern int pm_generic_restore_noirq(struct device *dev);
801 extern int pm_generic_restore_early(struct device *dev);
802 extern int pm_generic_restore(struct device *dev);
803 extern int pm_generic_poweroff_noirq(struct device *dev);
804 extern int pm_generic_poweroff_late(struct device *dev);
805 extern int pm_generic_poweroff(struct device *dev);
806 extern void pm_generic_complete(struct device *dev);
808 extern bool dev_pm_skip_resume(struct device *dev);
809 extern bool dev_pm_skip_suspend(struct device *dev);
811 #else /* !CONFIG_PM_SLEEP */
813 #define device_pm_lock() do {} while (0)
814 #define device_pm_unlock() do {} while (0)
816 static inline int dpm_suspend_start(pm_message_t state)
821 #define suspend_report_result(dev, fn, ret) do {} while (0)
823 static inline int device_pm_wait_for_dev(struct device *a, struct device *b)
828 static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
832 #define pm_generic_prepare NULL
833 #define pm_generic_suspend_late NULL
834 #define pm_generic_suspend_noirq NULL
835 #define pm_generic_suspend NULL
836 #define pm_generic_resume_early NULL
837 #define pm_generic_resume_noirq NULL
838 #define pm_generic_resume NULL
839 #define pm_generic_freeze_noirq NULL
840 #define pm_generic_freeze_late NULL
841 #define pm_generic_freeze NULL
842 #define pm_generic_thaw_noirq NULL
843 #define pm_generic_thaw_early NULL
844 #define pm_generic_thaw NULL
845 #define pm_generic_restore_noirq NULL
846 #define pm_generic_restore_early NULL
847 #define pm_generic_restore NULL
848 #define pm_generic_poweroff_noirq NULL
849 #define pm_generic_poweroff_late NULL
850 #define pm_generic_poweroff NULL
851 #define pm_generic_complete NULL
852 #endif /* !CONFIG_PM_SLEEP */
854 /* How to reorder dpm_list after device_move() */
857 DPM_ORDER_DEV_AFTER_PARENT,
858 DPM_ORDER_PARENT_BEFORE_DEV,
862 #endif /* _LINUX_PM_H */