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1a59d1b8 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * pm.h - Power management interface | |
4 | * | |
5 | * Copyright (C) 2000 Andrew Henroid | |
1da177e4 LT |
6 | */ |
7 | ||
8 | #ifndef _LINUX_PM_H | |
9 | #define _LINUX_PM_H | |
10 | ||
1da177e4 | 11 | #include <linux/list.h> |
5e928f77 RW |
12 | #include <linux/workqueue.h> |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/timer.h> | |
8234f673 | 16 | #include <linux/hrtimer.h> |
5af84b82 | 17 | #include <linux/completion.h> |
1da177e4 | 18 | |
1da177e4 LT |
19 | /* |
20 | * Callbacks for platform drivers to implement. | |
21 | */ | |
1da177e4 | 22 | extern void (*pm_power_off)(void); |
bd804eba | 23 | extern void (*pm_power_off_prepare)(void); |
1da177e4 | 24 | |
f43f627d JB |
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 | |
30 | static inline void pm_vt_switch_required(struct device *dev, bool required) | |
31 | { | |
32 | } | |
33 | static inline void pm_vt_switch_unregister(struct device *dev) | |
34 | { | |
35 | } | |
36 | #endif /* CONFIG_VT_CONSOLE_SLEEP */ | |
37 | ||
1da177e4 LT |
38 | /* |
39 | * Device power management | |
40 | */ | |
41 | ||
42 | struct device; | |
43 | ||
7490e442 AS |
44 | #ifdef CONFIG_PM |
45 | extern const char power_group_name[]; /* = "power" */ | |
46 | #else | |
47 | #define power_group_name NULL | |
48 | #endif | |
49 | ||
ca078bae PM |
50 | typedef struct pm_message { |
51 | int event; | |
52 | } pm_message_t; | |
1da177e4 | 53 | |
1eede070 | 54 | /** |
4d29b2e5 | 55 | * struct dev_pm_ops - device PM callbacks. |
f7bc83d8 RW |
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 | |
aae4518b RW |
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 | |
f7bc83d8 RW |
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.] | |
1eede070 RW |
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 | |
f7bc83d8 RW |
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 | |
1eede070 RW |
93 | * of the other devices that the PM core has unsuccessfully attempted to |
94 | * suspend earlier). | |
f7bc83d8 | 95 | * The PM core executes subsystem-level @complete() after it has executed |
aae4518b RW |
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. | |
1eede070 RW |
106 | * |
107 | * @suspend: Executed before putting the system into a sleep state in which the | |
f7bc83d8 RW |
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. | |
1eede070 | 114 | * |
cf579dfb RW |
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 | * | |
1eede070 | 119 | * @resume: Executed after waking the system up from a sleep state in which the |
f7bc83d8 RW |
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. | |
1eede070 | 130 | * |
cf579dfb RW |
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 | * | |
1eede070 | 135 | * @freeze: Hibernation-specific, executed before creating a hibernation image. |
f7bc83d8 RW |
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. | |
1eede070 | 143 | * |
cf579dfb RW |
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 | * | |
1eede070 | 148 | * @thaw: Hibernation-specific, executed after creating a hibernation image OR |
f7bc83d8 | 149 | * if the creation of an image has failed. Also executed after a failing |
1eede070 RW |
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(). | |
f7bc83d8 RW |
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. | |
1eede070 | 156 | * |
cf579dfb RW |
157 | * @thaw_early: Prepare to execute @thaw(). Undo the changes made by the |
158 | * preceding @freeze_late(). | |
159 | * | |
1eede070 | 160 | * @poweroff: Hibernation-specific, executed after saving a hibernation image. |
f7bc83d8 RW |
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. | |
1eede070 | 165 | * |
cf579dfb RW |
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 | * | |
1eede070 | 169 | * @restore: Hibernation-specific, executed after restoring the contents of main |
f7bc83d8 RW |
170 | * memory from a hibernation image, analogous to @resume(). |
171 | * | |
cf579dfb RW |
172 | * @restore_early: Prepare to execute @restore(), analogous to @resume_early(). |
173 | * | |
f7bc83d8 RW |
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 | |
cf579dfb RW |
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(). | |
f7bc83d8 RW |
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. | |
cf579dfb RW |
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. | |
f7bc83d8 RW |
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(). | |
1eede070 | 213 | * |
5e928f77 RW |
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. | |
f7bc83d8 | 216 | * This need not mean that the device should be put into a low-power state. |
5e928f77 RW |
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 | |
f7bc83d8 RW |
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. | |
5e928f77 RW |
222 | * |
223 | * @runtime_resume: Put the device into the fully active state in response to a | |
f7bc83d8 RW |
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 | |
5e928f77 RW |
226 | * registers, so that it is fully operational. |
227 | * | |
f7bc83d8 | 228 | * @runtime_idle: Device appears to be inactive and it might be put into a |
651665db GU |
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. | |
f7bc83d8 | 232 | * |
4d29b2e5 RW |
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). | |
f7bc83d8 | 239 | * |
4d29b2e5 RW |
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 | * | |
4d29b2e5 RW |
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 | * | |
151f4e2b | 274 | * Refer to Documentation/power/runtime_pm.rst for more information about the |
4d29b2e5 RW |
275 | * role of the @runtime_suspend(), @runtime_resume() and @runtime_idle() |
276 | * callbacks in device runtime power management. | |
1eede070 | 277 | */ |
adf09493 RW |
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); | |
cf579dfb RW |
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); | |
1eede070 RW |
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); | |
5e928f77 RW |
299 | int (*runtime_suspend)(struct device *dev); |
300 | int (*runtime_resume)(struct device *dev); | |
301 | int (*runtime_idle)(struct device *dev); | |
1eede070 RW |
302 | }; |
303 | ||
d690b2cd RW |
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 | ||
f78c4cff UH |
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 | ||
020af89a GS |
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 | ||
6ed23b80 | 340 | #ifdef CONFIG_PM |
d690b2cd RW |
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 | ||
9d62ec6c AT |
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) \ | |
47145210 | 354 | const struct dev_pm_ops name = { \ |
d690b2cd RW |
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 | |
3e54d151 | 360 | * (system suspend, hibernation or runtime PM). |
c4882525 RW |
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). | |
d690b2cd RW |
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) \ | |
9d62ec6c AT |
375 | } |
376 | ||
4d29b2e5 | 377 | /* |
1eede070 RW |
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 | * | |
33fe0ad9 | 387 | * FREEZE System is going to hibernate, call ->prepare() and ->freeze() |
1eede070 RW |
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. | |
8111d1b5 AS |
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. | |
1eede070 RW |
427 | */ |
428 | ||
1a9a9152 | 429 | #define PM_EVENT_INVALID (-1) |
1eede070 | 430 | #define PM_EVENT_ON 0x0000 |
33fe0ad9 | 431 | #define PM_EVENT_FREEZE 0x0001 |
1eede070 RW |
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 | |
8111d1b5 AS |
439 | #define PM_EVENT_USER 0x0100 |
440 | #define PM_EVENT_REMOTE 0x0200 | |
441 | #define PM_EVENT_AUTO 0x0400 | |
1eede070 | 442 | |
8111d1b5 AS |
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) | |
7f4f5d45 | 446 | #define PM_EVENT_REMOTE_RESUME (PM_EVENT_REMOTE | PM_EVENT_RESUME) |
8111d1b5 AS |
447 | #define PM_EVENT_AUTO_SUSPEND (PM_EVENT_AUTO | PM_EVENT_SUSPEND) |
448 | #define PM_EVENT_AUTO_RESUME (PM_EVENT_AUTO | PM_EVENT_RESUME) | |
1eede070 | 449 | |
1a9a9152 | 450 | #define PMSG_INVALID ((struct pm_message){ .event = PM_EVENT_INVALID, }) |
8111d1b5 | 451 | #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, }) |
1eede070 RW |
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, }) | |
7f4f5d45 | 460 | #define PMSG_USER_SUSPEND ((struct pm_message) \ |
8111d1b5 | 461 | { .event = PM_EVENT_USER_SUSPEND, }) |
7f4f5d45 | 462 | #define PMSG_USER_RESUME ((struct pm_message) \ |
8111d1b5 | 463 | { .event = PM_EVENT_USER_RESUME, }) |
7f4f5d45 | 464 | #define PMSG_REMOTE_RESUME ((struct pm_message) \ |
8111d1b5 | 465 | { .event = PM_EVENT_REMOTE_RESUME, }) |
7f4f5d45 | 466 | #define PMSG_AUTO_SUSPEND ((struct pm_message) \ |
8111d1b5 | 467 | { .event = PM_EVENT_AUTO_SUSPEND, }) |
7f4f5d45 | 468 | #define PMSG_AUTO_RESUME ((struct pm_message) \ |
8111d1b5 | 469 | { .event = PM_EVENT_AUTO_RESUME, }) |
1eede070 | 470 | |
5b1b0b81 AS |
471 | #define PMSG_IS_AUTO(msg) (((msg).event & PM_EVENT_AUTO) != 0) |
472 | ||
4d29b2e5 | 473 | /* |
5e928f77 RW |
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 | ||
4d29b2e5 | 503 | /* |
5e928f77 RW |
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 | * | |
15bcb91d AS |
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 | * | |
5e928f77 RW |
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, | |
15bcb91d | 522 | RPM_REQ_AUTOSUSPEND, |
5e928f77 RW |
523 | RPM_REQ_RESUME, |
524 | }; | |
525 | ||
074037ec | 526 | struct wakeup_source; |
4990d4fe | 527 | struct wake_irq; |
00e7c295 | 528 | struct pm_domain_data; |
4605ab65 | 529 | |
5c095a0e RW |
530 | struct pm_subsys_data { |
531 | spinlock_t lock; | |
ef27bed1 | 532 | unsigned int refcount; |
5c095a0e RW |
533 | #ifdef CONFIG_PM_CLK |
534 | struct list_head clock_list; | |
535 | #endif | |
4605ab65 | 536 | #ifdef CONFIG_PM_GENERIC_DOMAINS |
cd0ea672 | 537 | struct pm_domain_data *domain_data; |
4605ab65 | 538 | #endif |
5c095a0e RW |
539 | }; |
540 | ||
08810a41 RW |
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 | * | |
0d4b54c6 | 547 | * NEVER_SKIP: Do not skip all system suspend/resume callbacks for the device. |
08810a41 | 548 | * SMART_PREPARE: Check the return value of the driver's ->prepare callback. |
0eab11c9 | 549 | * SMART_SUSPEND: No need to resume the device from runtime suspend. |
0d4b54c6 | 550 | * LEAVE_SUSPENDED: Avoid resuming the device during system resume if possible. |
08810a41 RW |
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. | |
0eab11c9 RW |
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. | |
0d4b54c6 RW |
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. | |
08810a41 | 567 | */ |
0d4b54c6 RW |
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) | |
08810a41 | 572 | |
1eede070 RW |
573 | struct dev_pm_info { |
574 | pm_message_t power_state; | |
5e928f77 | 575 | unsigned int can_wakeup:1; |
b8c76f6a | 576 | unsigned int async_suspend:1; |
9ed98953 | 577 | bool in_dpm_list:1; /* Owned by the PM core */ |
f76b168b | 578 | bool is_prepared:1; /* Owned by the PM core */ |
6d0e0e84 | 579 | bool is_suspended:1; /* Ditto */ |
3d2699bc LC |
580 | bool is_noirq_suspended:1; |
581 | bool is_late_suspended:1; | |
85945c28 | 582 | bool no_pm:1; |
bed2b42d | 583 | bool early_init:1; /* Owned by the PM core */ |
aae4518b | 584 | bool direct_complete:1; /* Owned by the PM core */ |
08810a41 | 585 | u32 driver_flags; |
074037ec | 586 | spinlock_t lock; |
5e928f77 | 587 | #ifdef CONFIG_PM_SLEEP |
1eede070 | 588 | struct list_head entry; |
5af84b82 | 589 | struct completion completion; |
074037ec | 590 | struct wakeup_source *wakeup; |
4ca46ff3 | 591 | bool wakeup_path:1; |
feb70af0 | 592 | bool syscore:1; |
aa8e54b5 | 593 | bool no_pm_callbacks:1; /* Owned by the PM core */ |
0d4b54c6 RW |
594 | unsigned int must_resume:1; /* Owned by the PM core */ |
595 | unsigned int may_skip_resume:1; /* Set by subsystems */ | |
805bdaec RW |
596 | #else |
597 | unsigned int should_wakeup:1; | |
1eede070 | 598 | #endif |
d30d819d | 599 | #ifdef CONFIG_PM |
8234f673 | 600 | struct hrtimer suspend_timer; |
5e928f77 RW |
601 | unsigned long timer_expires; |
602 | struct work_struct work; | |
603 | wait_queue_head_t wait_queue; | |
4990d4fe | 604 | struct wake_irq *wakeirq; |
5e928f77 RW |
605 | atomic_t usage_count; |
606 | atomic_t child_count; | |
607 | unsigned int disable_depth:3; | |
5e928f77 RW |
608 | unsigned int idle_notification:1; |
609 | unsigned int request_pending:1; | |
610 | unsigned int deferred_resume:1; | |
53823639 | 611 | unsigned int runtime_auto:1; |
372a12ed | 612 | bool ignore_children:1; |
7490e442 | 613 | unsigned int no_callbacks:1; |
c7b61de5 | 614 | unsigned int irq_safe:1; |
15bcb91d AS |
615 | unsigned int use_autosuspend:1; |
616 | unsigned int timer_autosuspends:1; | |
e823407f | 617 | unsigned int memalloc_noio:1; |
baa8809f | 618 | unsigned int links_count; |
5e928f77 RW |
619 | enum rpm_request request; |
620 | enum rpm_status runtime_status; | |
621 | int runtime_error; | |
15bcb91d | 622 | int autosuspend_delay; |
8234f673 | 623 | u64 last_busy; |
a08c2a5a TG |
624 | u64 active_time; |
625 | u64 suspended_time; | |
626 | u64 accounting_timestamp; | |
5e928f77 | 627 | #endif |
5c095a0e | 628 | struct pm_subsys_data *subsys_data; /* Owned by the subsystem. */ |
2d984ad1 | 629 | void (*set_latency_tolerance)(struct device *, s32); |
5f986c59 | 630 | struct dev_pm_qos *qos; |
1eede070 RW |
631 | }; |
632 | ||
ef27bed1 | 633 | extern int dev_pm_get_subsys_data(struct device *dev); |
1e95e3b2 | 634 | extern void dev_pm_put_subsys_data(struct device *dev); |
8d4b9d1b | 635 | |
4d29b2e5 RW |
636 | /** |
637 | * struct dev_pm_domain - power management domain representation. | |
e90d5532 | 638 | * |
4d29b2e5 | 639 | * @ops: Power management operations associated with this domain. |
ca765a8c | 640 | * @start: Called when a user needs to start the device via the domain. |
e90d5532 RW |
641 | * @detach: Called when removing a device from the domain. |
642 | * @activate: Called before executing probe routines for bus types and drivers. | |
643 | * @sync: Called after successful driver probe. | |
644 | * @dismiss: Called after unsuccessful driver probe and after driver removal. | |
4d29b2e5 RW |
645 | * |
646 | * Power domains provide callbacks that are executed during system suspend, | |
647 | * hibernation, system resume and during runtime PM transitions instead of | |
648 | * subsystem-level and driver-level callbacks. | |
7538e3db | 649 | */ |
564b905a | 650 | struct dev_pm_domain { |
7538e3db | 651 | struct dev_pm_ops ops; |
ca765a8c | 652 | int (*start)(struct device *dev); |
c3099a52 | 653 | void (*detach)(struct device *dev, bool power_off); |
e90d5532 RW |
654 | int (*activate)(struct device *dev); |
655 | void (*sync)(struct device *dev); | |
656 | void (*dismiss)(struct device *dev); | |
7538e3db | 657 | }; |
8d4b9d1b | 658 | |
1eede070 RW |
659 | /* |
660 | * The PM_EVENT_ messages are also used by drivers implementing the legacy | |
661 | * suspend framework, based on the ->suspend() and ->resume() callbacks common | |
662 | * for suspend and hibernation transitions, according to the rules below. | |
663 | */ | |
664 | ||
665 | /* Necessary, because several drivers use PM_EVENT_PRETHAW */ | |
666 | #define PM_EVENT_PRETHAW PM_EVENT_QUIESCE | |
667 | ||
668 | /* | |
82bb67f2 DB |
669 | * One transition is triggered by resume(), after a suspend() call; the |
670 | * message is implicit: | |
671 | * | |
672 | * ON Driver starts working again, responding to hardware events | |
33fe0ad9 GU |
673 | * and software requests. The hardware may have gone through |
674 | * a power-off reset, or it may have maintained state from the | |
675 | * previous suspend() which the driver will rely on while | |
676 | * resuming. On most platforms, there are no restrictions on | |
677 | * availability of resources like clocks during resume(). | |
82bb67f2 DB |
678 | * |
679 | * Other transitions are triggered by messages sent using suspend(). All | |
680 | * these transitions quiesce the driver, so that I/O queues are inactive. | |
681 | * That commonly entails turning off IRQs and DMA; there may be rules | |
682 | * about how to quiesce that are specific to the bus or the device's type. | |
683 | * (For example, network drivers mark the link state.) Other details may | |
684 | * differ according to the message: | |
685 | * | |
686 | * SUSPEND Quiesce, enter a low power device state appropriate for | |
33fe0ad9 GU |
687 | * the upcoming system state (such as PCI_D3hot), and enable |
688 | * wakeup events as appropriate. | |
82bb67f2 | 689 | * |
3a2d5b70 | 690 | * HIBERNATE Enter a low power device state appropriate for the hibernation |
33fe0ad9 | 691 | * state (eg. ACPI S4) and enable wakeup events as appropriate. |
3a2d5b70 | 692 | * |
82bb67f2 | 693 | * FREEZE Quiesce operations so that a consistent image can be saved; |
33fe0ad9 GU |
694 | * but do NOT otherwise enter a low power device state, and do |
695 | * NOT emit system wakeup events. | |
82bb67f2 DB |
696 | * |
697 | * PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring | |
33fe0ad9 GU |
698 | * the system from a snapshot taken after an earlier FREEZE. |
699 | * Some drivers will need to reset their hardware state instead | |
700 | * of preserving it, to ensure that it's never mistaken for the | |
701 | * state which that earlier snapshot had set up. | |
82bb67f2 DB |
702 | * |
703 | * A minimally power-aware driver treats all messages as SUSPEND, fully | |
704 | * reinitializes its device during resume() -- whether or not it was reset | |
705 | * during the suspend/resume cycle -- and can't issue wakeup events. | |
706 | * | |
707 | * More power-aware drivers may also use low power states at runtime as | |
708 | * well as during system sleep states like PM_SUSPEND_STANDBY. They may | |
709 | * be able to use wakeup events to exit from runtime low-power states, | |
710 | * or from system low-power states such as standby or suspend-to-RAM. | |
1da177e4 LT |
711 | */ |
712 | ||
1eede070 | 713 | #ifdef CONFIG_PM_SLEEP |
d47d81c0 | 714 | extern void device_pm_lock(void); |
cf579dfb | 715 | extern void dpm_resume_start(pm_message_t state); |
d1616302 | 716 | extern void dpm_resume_end(pm_message_t state); |
2a8a8ce6 RW |
717 | extern void dpm_resume_noirq(pm_message_t state); |
718 | extern void dpm_resume_early(pm_message_t state); | |
91e7c75b RW |
719 | extern void dpm_resume(pm_message_t state); |
720 | extern void dpm_complete(pm_message_t state); | |
1da177e4 | 721 | |
1eede070 | 722 | extern void device_pm_unlock(void); |
cf579dfb | 723 | extern int dpm_suspend_end(pm_message_t state); |
d1616302 | 724 | extern int dpm_suspend_start(pm_message_t state); |
2a8a8ce6 RW |
725 | extern int dpm_suspend_noirq(pm_message_t state); |
726 | extern int dpm_suspend_late(pm_message_t state); | |
91e7c75b RW |
727 | extern int dpm_suspend(pm_message_t state); |
728 | extern int dpm_prepare(pm_message_t state); | |
0ac85241 | 729 | |
02669492 AM |
730 | extern void __suspend_report_result(const char *function, void *fn, int ret); |
731 | ||
732 | #define suspend_report_result(fn, ret) \ | |
733 | do { \ | |
d5c003b4 | 734 | __suspend_report_result(__func__, fn, ret); \ |
02669492 | 735 | } while (0) |
9a7834d0 | 736 | |
098dff73 | 737 | extern int device_pm_wait_for_dev(struct device *sub, struct device *dev); |
dfe3212e | 738 | extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)); |
6538df80 RW |
739 | |
740 | extern int pm_generic_prepare(struct device *dev); | |
e470d066 | 741 | extern int pm_generic_suspend_late(struct device *dev); |
e5291928 | 742 | extern int pm_generic_suspend_noirq(struct device *dev); |
6538df80 | 743 | extern int pm_generic_suspend(struct device *dev); |
e470d066 | 744 | extern int pm_generic_resume_early(struct device *dev); |
e5291928 | 745 | extern int pm_generic_resume_noirq(struct device *dev); |
6538df80 | 746 | extern int pm_generic_resume(struct device *dev); |
e5291928 | 747 | extern int pm_generic_freeze_noirq(struct device *dev); |
e470d066 | 748 | extern int pm_generic_freeze_late(struct device *dev); |
6538df80 | 749 | extern int pm_generic_freeze(struct device *dev); |
e5291928 | 750 | extern int pm_generic_thaw_noirq(struct device *dev); |
e470d066 | 751 | extern int pm_generic_thaw_early(struct device *dev); |
6538df80 | 752 | extern int pm_generic_thaw(struct device *dev); |
e5291928 | 753 | extern int pm_generic_restore_noirq(struct device *dev); |
e470d066 | 754 | extern int pm_generic_restore_early(struct device *dev); |
6538df80 | 755 | extern int pm_generic_restore(struct device *dev); |
e5291928 | 756 | extern int pm_generic_poweroff_noirq(struct device *dev); |
e470d066 | 757 | extern int pm_generic_poweroff_late(struct device *dev); |
6538df80 RW |
758 | extern int pm_generic_poweroff(struct device *dev); |
759 | extern void pm_generic_complete(struct device *dev); | |
760 | ||
76c70cb5 | 761 | extern bool dev_pm_skip_resume(struct device *dev); |
c4b65157 RW |
762 | extern bool dev_pm_smart_suspend_and_suspended(struct device *dev); |
763 | ||
d288e47c AS |
764 | #else /* !CONFIG_PM_SLEEP */ |
765 | ||
ffa6a705 CH |
766 | #define device_pm_lock() do {} while (0) |
767 | #define device_pm_unlock() do {} while (0) | |
768 | ||
d1616302 | 769 | static inline int dpm_suspend_start(pm_message_t state) |
d288e47c AS |
770 | { |
771 | return 0; | |
772 | } | |
773 | ||
9a3df1f7 | 774 | #define suspend_report_result(fn, ret) do {} while (0) |
d288e47c | 775 | |
098dff73 RW |
776 | static inline int device_pm_wait_for_dev(struct device *a, struct device *b) |
777 | { | |
778 | return 0; | |
779 | } | |
6538df80 | 780 | |
dfe3212e ML |
781 | static inline void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) |
782 | { | |
783 | } | |
784 | ||
0a9efc4d UH |
785 | #define pm_generic_prepare NULL |
786 | #define pm_generic_suspend_late NULL | |
787 | #define pm_generic_suspend_noirq NULL | |
788 | #define pm_generic_suspend NULL | |
789 | #define pm_generic_resume_early NULL | |
790 | #define pm_generic_resume_noirq NULL | |
791 | #define pm_generic_resume NULL | |
792 | #define pm_generic_freeze_noirq NULL | |
793 | #define pm_generic_freeze_late NULL | |
794 | #define pm_generic_freeze NULL | |
795 | #define pm_generic_thaw_noirq NULL | |
796 | #define pm_generic_thaw_early NULL | |
797 | #define pm_generic_thaw NULL | |
798 | #define pm_generic_restore_noirq NULL | |
799 | #define pm_generic_restore_early NULL | |
800 | #define pm_generic_restore NULL | |
801 | #define pm_generic_poweroff_noirq NULL | |
802 | #define pm_generic_poweroff_late NULL | |
803 | #define pm_generic_poweroff NULL | |
804 | #define pm_generic_complete NULL | |
d288e47c AS |
805 | #endif /* !CONFIG_PM_SLEEP */ |
806 | ||
ffa6a705 CH |
807 | /* How to reorder dpm_list after device_move() */ |
808 | enum dpm_order { | |
809 | DPM_ORDER_NONE, | |
810 | DPM_ORDER_DEV_AFTER_PARENT, | |
811 | DPM_ORDER_PARENT_BEFORE_DEV, | |
812 | DPM_ORDER_DEV_LAST, | |
813 | }; | |
814 | ||
1da177e4 | 815 | #endif /* _LINUX_PM_H */ |