• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  *  pm.h - Power management interface
4  *
5  *  Copyright (C) 2000 Andrew Henroid
6  */
7 
8 #ifndef _LINUX_PM_H
9 #define _LINUX_PM_H
10 
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>
18 
19 /*
20  * Callbacks for platform drivers to implement.
21  */
22 extern void (*pm_power_off)(void);
23 extern void (*pm_power_off_prepare)(void);
24 
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);
29 #else
pm_vt_switch_required(struct device * dev,bool required)30 static inline void pm_vt_switch_required(struct device *dev, bool required)
31 {
32 }
pm_vt_switch_unregister(struct device * dev)33 static inline void pm_vt_switch_unregister(struct device *dev)
34 {
35 }
36 #endif /* CONFIG_VT_CONSOLE_SLEEP */
37 
38 /*
39  * Device power management
40  */
41 
42 struct device;
43 
44 #ifdef CONFIG_PM
45 extern const char power_group_name[];		/* = "power" */
46 #else
47 #define power_group_name	NULL
48 #endif
49 
50 typedef struct pm_message {
51 	int event;
52 } pm_message_t;
53 
54 /**
55  * struct dev_pm_ops - device PM callbacks.
56  *
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.]
87  *
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
94  *	suspend earlier).
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.
106  *
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.
114  *
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.
118  *
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.
130  *
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
133  *	resume callback.
134  *
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.
143  *
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.
147  *
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.
156  *
157  * @thaw_early: Prepare to execute @thaw().  Undo the changes made by the
158  *	preceding @freeze_late().
159  *
160  * @poweroff: Hibernation-specific, executed after saving a hibernation image.
161  *	Analogous to @suspend(), but it need not save the device's settings in
162  *	memory.
163  *	Subsystem-level @poweroff() is executed for all devices after invoking
164  *	subsystem-level @prepare() for all of them.
165  *
166  * @poweroff_late: Continue operations started by @poweroff().  Analogous to
167  *	@suspend_late(), but it need not save the device's settings in memory.
168  *
169  * @restore: Hibernation-specific, executed after restoring the contents of main
170  *	memory from a hibernation image, analogous to @resume().
171  *
172  * @restore_early: Prepare to execute @restore(), analogous to @resume_early().
173  *
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
186  *	@suspend_noirq().
187  *
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.
192  *
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.
200  *
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.
205  *
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.
208  *
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().
213  *
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.
222  *
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.
227  *
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.
232  *
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).
239  *
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.
249  *
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.
260  *
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
265  * asleep).
266  *
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.
273  *
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.
277  */
278 struct dev_pm_ops {
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);
302 };
303 
304 #ifdef CONFIG_PM_SLEEP
305 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
306 	.suspend = suspend_fn, \
307 	.resume = resume_fn, \
308 	.freeze = suspend_fn, \
309 	.thaw = resume_fn, \
310 	.poweroff = suspend_fn, \
311 	.restore = resume_fn,
312 #else
313 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
314 #endif
315 
316 #ifdef CONFIG_PM_SLEEP
317 #define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
318 	.suspend_late = suspend_fn, \
319 	.resume_early = resume_fn, \
320 	.freeze_late = suspend_fn, \
321 	.thaw_early = resume_fn, \
322 	.poweroff_late = suspend_fn, \
323 	.restore_early = resume_fn,
324 #else
325 #define SET_LATE_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
326 #endif
327 
328 #ifdef CONFIG_PM_SLEEP
329 #define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
330 	.suspend_noirq = suspend_fn, \
331 	.resume_noirq = resume_fn, \
332 	.freeze_noirq = suspend_fn, \
333 	.thaw_noirq = resume_fn, \
334 	.poweroff_noirq = suspend_fn, \
335 	.restore_noirq = resume_fn,
336 #else
337 #define SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
338 #endif
339 
340 #ifdef CONFIG_PM
341 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
342 	.runtime_suspend = suspend_fn, \
343 	.runtime_resume = resume_fn, \
344 	.runtime_idle = idle_fn,
345 #else
346 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
347 #endif
348 
349 /*
350  * Use this if you want to use the same suspend and resume callbacks for suspend
351  * to RAM and hibernation.
352  */
353 #define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
354 const struct dev_pm_ops name = { \
355 	SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
356 }
357 
358 /*
359  * Use this for defining a set of PM operations to be used in all situations
360  * (system suspend, hibernation or runtime PM).
361  * NOTE: In general, system suspend callbacks, .suspend() and .resume(), should
362  * be different from the corresponding runtime PM callbacks, .runtime_suspend(),
363  * and .runtime_resume(), because .runtime_suspend() always works on an already
364  * quiescent device, while .suspend() should assume that the device may be doing
365  * something when it is called (it should ensure that the device will be
366  * quiescent after it has returned).  Therefore it's better to point the "late"
367  * suspend and "early" resume callback pointers, .suspend_late() and
368  * .resume_early(), to the same routines as .runtime_suspend() and
369  * .runtime_resume(), respectively (and analogously for hibernation).
370  */
371 #define UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
372 const struct dev_pm_ops name = { \
373 	SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
374 	SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
375 }
376 
377 /*
378  * PM_EVENT_ messages
379  *
380  * The following PM_EVENT_ messages are defined for the internal use of the PM
381  * core, in order to provide a mechanism allowing the high level suspend and
382  * hibernation code to convey the necessary information to the device PM core
383  * code:
384  *
385  * ON		No transition.
386  *
387  * FREEZE	System is going to hibernate, call ->prepare() and ->freeze()
388  *		for all devices.
389  *
390  * SUSPEND	System is going to suspend, call ->prepare() and ->suspend()
391  *		for all devices.
392  *
393  * HIBERNATE	Hibernation image has been saved, call ->prepare() and
394  *		->poweroff() for all devices.
395  *
396  * QUIESCE	Contents of main memory are going to be restored from a (loaded)
397  *		hibernation image, call ->prepare() and ->freeze() for all
398  *		devices.
399  *
400  * RESUME	System is resuming, call ->resume() and ->complete() for all
401  *		devices.
402  *
403  * THAW		Hibernation image has been created, call ->thaw() and
404  *		->complete() for all devices.
405  *
406  * RESTORE	Contents of main memory have been restored from a hibernation
407  *		image, call ->restore() and ->complete() for all devices.
408  *
409  * RECOVER	Creation of a hibernation image or restoration of the main
410  *		memory contents from a hibernation image has failed, call
411  *		->thaw() and ->complete() for all devices.
412  *
413  * The following PM_EVENT_ messages are defined for internal use by
414  * kernel subsystems.  They are never issued by the PM core.
415  *
416  * USER_SUSPEND		Manual selective suspend was issued by userspace.
417  *
418  * USER_RESUME		Manual selective resume was issued by userspace.
419  *
420  * REMOTE_WAKEUP	Remote-wakeup request was received from the device.
421  *
422  * AUTO_SUSPEND		Automatic (device idle) runtime suspend was
423  *			initiated by the subsystem.
424  *
425  * AUTO_RESUME		Automatic (device needed) runtime resume was
426  *			requested by a driver.
427  */
428 
429 #define PM_EVENT_INVALID	(-1)
430 #define PM_EVENT_ON		0x0000
431 #define PM_EVENT_FREEZE		0x0001
432 #define PM_EVENT_SUSPEND	0x0002
433 #define PM_EVENT_HIBERNATE	0x0004
434 #define PM_EVENT_QUIESCE	0x0008
435 #define PM_EVENT_RESUME		0x0010
436 #define PM_EVENT_THAW		0x0020
437 #define PM_EVENT_RESTORE	0x0040
438 #define PM_EVENT_RECOVER	0x0080
439 #define PM_EVENT_USER		0x0100
440 #define PM_EVENT_REMOTE		0x0200
441 #define PM_EVENT_AUTO		0x0400
442 
443 #define PM_EVENT_SLEEP		(PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
444 #define PM_EVENT_USER_SUSPEND	(PM_EVENT_USER | PM_EVENT_SUSPEND)
445 #define PM_EVENT_USER_RESUME	(PM_EVENT_USER | PM_EVENT_RESUME)
446 #define PM_EVENT_REMOTE_RESUME	(PM_EVENT_REMOTE | PM_EVENT_RESUME)
447 #define PM_EVENT_AUTO_SUSPEND	(PM_EVENT_AUTO | PM_EVENT_SUSPEND)
448 #define PM_EVENT_AUTO_RESUME	(PM_EVENT_AUTO | PM_EVENT_RESUME)
449 
450 #define PMSG_INVALID	((struct pm_message){ .event = PM_EVENT_INVALID, })
451 #define PMSG_ON		((struct pm_message){ .event = PM_EVENT_ON, })
452 #define PMSG_FREEZE	((struct pm_message){ .event = PM_EVENT_FREEZE, })
453 #define PMSG_QUIESCE	((struct pm_message){ .event = PM_EVENT_QUIESCE, })
454 #define PMSG_SUSPEND	((struct pm_message){ .event = PM_EVENT_SUSPEND, })
455 #define PMSG_HIBERNATE	((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
456 #define PMSG_RESUME	((struct pm_message){ .event = PM_EVENT_RESUME, })
457 #define PMSG_THAW	((struct pm_message){ .event = PM_EVENT_THAW, })
458 #define PMSG_RESTORE	((struct pm_message){ .event = PM_EVENT_RESTORE, })
459 #define PMSG_RECOVER	((struct pm_message){ .event = PM_EVENT_RECOVER, })
460 #define PMSG_USER_SUSPEND	((struct pm_message) \
461 					{ .event = PM_EVENT_USER_SUSPEND, })
462 #define PMSG_USER_RESUME	((struct pm_message) \
463 					{ .event = PM_EVENT_USER_RESUME, })
464 #define PMSG_REMOTE_RESUME	((struct pm_message) \
465 					{ .event = PM_EVENT_REMOTE_RESUME, })
466 #define PMSG_AUTO_SUSPEND	((struct pm_message) \
467 					{ .event = PM_EVENT_AUTO_SUSPEND, })
468 #define PMSG_AUTO_RESUME	((struct pm_message) \
469 					{ .event = PM_EVENT_AUTO_RESUME, })
470 
471 #define PMSG_IS_AUTO(msg)	(((msg).event & PM_EVENT_AUTO) != 0)
472 
473 /*
474  * Device run-time power management status.
475  *
476  * These status labels are used internally by the PM core to indicate the
477  * current status of a device with respect to the PM core operations.  They do
478  * not reflect the actual power state of the device or its status as seen by the
479  * driver.
480  *
481  * RPM_ACTIVE		Device is fully operational.  Indicates that the device
482  *			bus type's ->runtime_resume() callback has completed
483  *			successfully.
484  *
485  * RPM_SUSPENDED	Device bus type's ->runtime_suspend() callback has
486  *			completed successfully.  The device is regarded as
487  *			suspended.
488  *
489  * RPM_RESUMING		Device bus type's ->runtime_resume() callback is being
490  *			executed.
491  *
492  * RPM_SUSPENDING	Device bus type's ->runtime_suspend() callback is being
493  *			executed.
494  */
495 
496 enum rpm_status {
497 	RPM_ACTIVE = 0,
498 	RPM_RESUMING,
499 	RPM_SUSPENDED,
500 	RPM_SUSPENDING,
501 };
502 
503 /*
504  * Device run-time power management request types.
505  *
506  * RPM_REQ_NONE		Do nothing.
507  *
508  * RPM_REQ_IDLE		Run the device bus type's ->runtime_idle() callback
509  *
510  * RPM_REQ_SUSPEND	Run the device bus type's ->runtime_suspend() callback
511  *
512  * RPM_REQ_AUTOSUSPEND	Same as RPM_REQ_SUSPEND, but not until the device has
513  *			been inactive for as long as power.autosuspend_delay
514  *
515  * RPM_REQ_RESUME	Run the device bus type's ->runtime_resume() callback
516  */
517 
518 enum rpm_request {
519 	RPM_REQ_NONE = 0,
520 	RPM_REQ_IDLE,
521 	RPM_REQ_SUSPEND,
522 	RPM_REQ_AUTOSUSPEND,
523 	RPM_REQ_RESUME,
524 };
525 
526 struct wakeup_source;
527 struct wake_irq;
528 struct pm_domain_data;
529 
530 struct pm_subsys_data {
531 	spinlock_t lock;
532 	unsigned int refcount;
533 #ifdef CONFIG_PM_CLK
534 	struct list_head clock_list;
535 #endif
536 #ifdef CONFIG_PM_GENERIC_DOMAINS
537 	struct pm_domain_data *domain_data;
538 #endif
539 };
540 
541 /*
542  * Driver flags to control system suspend/resume behavior.
543  *
544  * These flags can be set by device drivers at the probe time.  They need not be
545  * cleared by the drivers as the driver core will take care of that.
546  *
547  * NEVER_SKIP: Do not skip all system suspend/resume callbacks for the device.
548  * SMART_PREPARE: Check the return value of the driver's ->prepare callback.
549  * SMART_SUSPEND: No need to resume the device from runtime suspend.
550  * LEAVE_SUSPENDED: Avoid resuming the device during system resume if possible.
551  *
552  * Setting SMART_PREPARE instructs bus types and PM domains which may want
553  * system suspend/resume callbacks to be skipped for the device to return 0 from
554  * their ->prepare callbacks if the driver's ->prepare callback returns 0 (in
555  * other words, the system suspend/resume callbacks can only be skipped for the
556  * device if its driver doesn't object against that).  This flag has no effect
557  * if NEVER_SKIP is set.
558  *
559  * Setting SMART_SUSPEND instructs bus types and PM domains which may want to
560  * runtime resume the device upfront during system suspend that doing so is not
561  * necessary from the driver's perspective.  It also may cause them to skip
562  * invocations of the ->suspend_late and ->suspend_noirq callbacks provided by
563  * the driver if they decide to leave the device in runtime suspend.
564  *
565  * Setting LEAVE_SUSPENDED informs the PM core and middle-layer code that the
566  * driver prefers the device to be left in suspend after system resume.
567  */
568 #define DPM_FLAG_NEVER_SKIP		BIT(0)
569 #define DPM_FLAG_SMART_PREPARE		BIT(1)
570 #define DPM_FLAG_SMART_SUSPEND		BIT(2)
571 #define DPM_FLAG_LEAVE_SUSPENDED	BIT(3)
572 
573 struct dev_pm_info {
574 	pm_message_t		power_state;
575 	unsigned int		can_wakeup:1;
576 	unsigned int		async_suspend:1;
577 	bool			in_dpm_list:1;	/* Owned by the PM core */
578 	bool			is_prepared:1;	/* Owned by the PM core */
579 	bool			is_suspended:1;	/* Ditto */
580 	bool			is_noirq_suspended:1;
581 	bool			is_late_suspended:1;
582 	bool			no_pm:1;
583 	bool			early_init:1;	/* Owned by the PM core */
584 	bool			direct_complete:1;	/* Owned by the PM core */
585 	u32			driver_flags;
586 	spinlock_t		lock;
587 #ifdef CONFIG_PM_SLEEP
588 	struct list_head	entry;
589 	struct completion	completion;
590 	struct wakeup_source	*wakeup;
591 	bool			wakeup_path:1;
592 	bool			syscore:1;
593 	bool			no_pm_callbacks:1;	/* Owned by the PM core */
594 	unsigned int		must_resume:1;	/* Owned by the PM core */
595 	unsigned int		may_skip_resume:1;	/* Set by subsystems */
596 #else
597 	unsigned int		should_wakeup:1;
598 #endif
599 #ifdef CONFIG_PM
600 	struct hrtimer		suspend_timer;
601 
602 /*
603  * See https://android-review.googlesource.com/c/kernel/common/+/1483579
604  * for more info as to why this #ifdef is here...
605  */
606 #ifdef __GENKSYMS__
607 	unsigned long		timer_expires;
608 #else
609 	u64			timer_expires;
610 #endif
611 	struct work_struct	work;
612 	wait_queue_head_t	wait_queue;
613 	struct wake_irq		*wakeirq;
614 	atomic_t		usage_count;
615 	atomic_t		child_count;
616 	unsigned int		disable_depth:3;
617 	unsigned int		idle_notification:1;
618 	unsigned int		request_pending:1;
619 	unsigned int		deferred_resume:1;
620 	unsigned int		runtime_auto:1;
621 	bool			ignore_children:1;
622 	unsigned int		no_callbacks:1;
623 	unsigned int		irq_safe:1;
624 	unsigned int		use_autosuspend:1;
625 	unsigned int		timer_autosuspends:1;
626 	unsigned int		memalloc_noio:1;
627 	unsigned int		links_count;
628 	enum rpm_request	request;
629 	enum rpm_status		runtime_status;
630 	int			runtime_error;
631 	int			autosuspend_delay;
632 	u64			last_busy;
633 	u64			active_time;
634 	u64			suspended_time;
635 	u64			accounting_timestamp;
636 #endif
637 	struct pm_subsys_data	*subsys_data;  /* Owned by the subsystem. */
638 	void (*set_latency_tolerance)(struct device *, s32);
639 	struct dev_pm_qos	*qos;
640 };
641 
642 extern int dev_pm_get_subsys_data(struct device *dev);
643 extern void dev_pm_put_subsys_data(struct device *dev);
644 
645 /**
646  * struct dev_pm_domain - power management domain representation.
647  *
648  * @ops: Power management operations associated with this domain.
649  * @detach: Called when removing a device from the domain.
650  * @activate: Called before executing probe routines for bus types and drivers.
651  * @sync: Called after successful driver probe.
652  * @dismiss: Called after unsuccessful driver probe and after driver removal.
653  *
654  * Power domains provide callbacks that are executed during system suspend,
655  * hibernation, system resume and during runtime PM transitions instead of
656  * subsystem-level and driver-level callbacks.
657  */
658 struct dev_pm_domain {
659 	struct dev_pm_ops	ops;
660 	void (*detach)(struct device *dev, bool power_off);
661 	int (*activate)(struct device *dev);
662 	void (*sync)(struct device *dev);
663 	void (*dismiss)(struct device *dev);
664 };
665 
666 /*
667  * The PM_EVENT_ messages are also used by drivers implementing the legacy
668  * suspend framework, based on the ->suspend() and ->resume() callbacks common
669  * for suspend and hibernation transitions, according to the rules below.
670  */
671 
672 /* Necessary, because several drivers use PM_EVENT_PRETHAW */
673 #define PM_EVENT_PRETHAW PM_EVENT_QUIESCE
674 
675 /*
676  * One transition is triggered by resume(), after a suspend() call; the
677  * message is implicit:
678  *
679  * ON		Driver starts working again, responding to hardware events
680  *		and software requests.  The hardware may have gone through
681  *		a power-off reset, or it may have maintained state from the
682  *		previous suspend() which the driver will rely on while
683  *		resuming.  On most platforms, there are no restrictions on
684  *		availability of resources like clocks during resume().
685  *
686  * Other transitions are triggered by messages sent using suspend().  All
687  * these transitions quiesce the driver, so that I/O queues are inactive.
688  * That commonly entails turning off IRQs and DMA; there may be rules
689  * about how to quiesce that are specific to the bus or the device's type.
690  * (For example, network drivers mark the link state.)  Other details may
691  * differ according to the message:
692  *
693  * SUSPEND	Quiesce, enter a low power device state appropriate for
694  *		the upcoming system state (such as PCI_D3hot), and enable
695  *		wakeup events as appropriate.
696  *
697  * HIBERNATE	Enter a low power device state appropriate for the hibernation
698  *		state (eg. ACPI S4) and enable wakeup events as appropriate.
699  *
700  * FREEZE	Quiesce operations so that a consistent image can be saved;
701  *		but do NOT otherwise enter a low power device state, and do
702  *		NOT emit system wakeup events.
703  *
704  * PRETHAW	Quiesce as if for FREEZE; additionally, prepare for restoring
705  *		the system from a snapshot taken after an earlier FREEZE.
706  *		Some drivers will need to reset their hardware state instead
707  *		of preserving it, to ensure that it's never mistaken for the
708  *		state which that earlier snapshot had set up.
709  *
710  * A minimally power-aware driver treats all messages as SUSPEND, fully
711  * reinitializes its device during resume() -- whether or not it was reset
712  * during the suspend/resume cycle -- and can't issue wakeup events.
713  *
714  * More power-aware drivers may also use low power states at runtime as
715  * well as during system sleep states like PM_SUSPEND_STANDBY.  They may
716  * be able to use wakeup events to exit from runtime low-power states,
717  * or from system low-power states such as standby or suspend-to-RAM.
718  */
719 
720 #ifdef CONFIG_PM_SLEEP
721 extern void device_pm_lock(void);
722 extern void dpm_resume_start(pm_message_t state);
723 extern void dpm_resume_end(pm_message_t state);
724 extern void dpm_resume_noirq(pm_message_t state);
725 extern void dpm_resume_early(pm_message_t state);
726 extern void dpm_resume(pm_message_t state);
727 extern void dpm_complete(pm_message_t state);
728 
729 extern void device_pm_unlock(void);
730 extern int dpm_suspend_end(pm_message_t state);
731 extern int dpm_suspend_start(pm_message_t state);
732 extern int dpm_suspend_noirq(pm_message_t state);
733 extern int dpm_suspend_late(pm_message_t state);
734 extern int dpm_suspend(pm_message_t state);
735 extern int dpm_prepare(pm_message_t state);
736 
737 extern void __suspend_report_result(const char *function, void *fn, int ret);
738 
739 #define suspend_report_result(fn, ret)					\
740 	do {								\
741 		__suspend_report_result(__func__, fn, ret);		\
742 	} while (0)
743 
744 extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
745 extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *));
746 
747 extern int pm_generic_prepare(struct device *dev);
748 extern int pm_generic_suspend_late(struct device *dev);
749 extern int pm_generic_suspend_noirq(struct device *dev);
750 extern int pm_generic_suspend(struct device *dev);
751 extern int pm_generic_resume_early(struct device *dev);
752 extern int pm_generic_resume_noirq(struct device *dev);
753 extern int pm_generic_resume(struct device *dev);
754 extern int pm_generic_freeze_noirq(struct device *dev);
755 extern int pm_generic_freeze_late(struct device *dev);
756 extern int pm_generic_freeze(struct device *dev);
757 extern int pm_generic_thaw_noirq(struct device *dev);
758 extern int pm_generic_thaw_early(struct device *dev);
759 extern int pm_generic_thaw(struct device *dev);
760 extern int pm_generic_restore_noirq(struct device *dev);
761 extern int pm_generic_restore_early(struct device *dev);
762 extern int pm_generic_restore(struct device *dev);
763 extern int pm_generic_poweroff_noirq(struct device *dev);
764 extern int pm_generic_poweroff_late(struct device *dev);
765 extern int pm_generic_poweroff(struct device *dev);
766 extern void pm_generic_complete(struct device *dev);
767 
768 extern bool dev_pm_may_skip_resume(struct device *dev);
769 extern bool dev_pm_smart_suspend_and_suspended(struct device *dev);
770 
771 #else /* !CONFIG_PM_SLEEP */
772 
773 #define device_pm_lock() do {} while (0)
774 #define device_pm_unlock() do {} while (0)
775 
dpm_suspend_start(pm_message_t state)776 static inline int dpm_suspend_start(pm_message_t state)
777 {
778 	return 0;
779 }
780 
781 #define suspend_report_result(fn, ret)		do {} while (0)
782 
device_pm_wait_for_dev(struct device * a,struct device * b)783 static inline int device_pm_wait_for_dev(struct device *a, struct device *b)
784 {
785 	return 0;
786 }
787 
dpm_for_each_dev(void * data,void (* fn)(struct device *,void *))788 static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *))
789 {
790 }
791 
792 #define pm_generic_prepare		NULL
793 #define pm_generic_suspend_late		NULL
794 #define pm_generic_suspend_noirq	NULL
795 #define pm_generic_suspend		NULL
796 #define pm_generic_resume_early		NULL
797 #define pm_generic_resume_noirq		NULL
798 #define pm_generic_resume		NULL
799 #define pm_generic_freeze_noirq		NULL
800 #define pm_generic_freeze_late		NULL
801 #define pm_generic_freeze		NULL
802 #define pm_generic_thaw_noirq		NULL
803 #define pm_generic_thaw_early		NULL
804 #define pm_generic_thaw			NULL
805 #define pm_generic_restore_noirq	NULL
806 #define pm_generic_restore_early	NULL
807 #define pm_generic_restore		NULL
808 #define pm_generic_poweroff_noirq	NULL
809 #define pm_generic_poweroff_late	NULL
810 #define pm_generic_poweroff		NULL
811 #define pm_generic_complete		NULL
812 #endif /* !CONFIG_PM_SLEEP */
813 
814 /* How to reorder dpm_list after device_move() */
815 enum dpm_order {
816 	DPM_ORDER_NONE,
817 	DPM_ORDER_DEV_AFTER_PARENT,
818 	DPM_ORDER_PARENT_BEFORE_DEV,
819 	DPM_ORDER_DEV_LAST,
820 };
821 
822 #endif /* _LINUX_PM_H */
823