1 /*
2 * pm.h - Power management interface
3 *
4 * Copyright (C) 2000 Andrew Henroid
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #ifndef _LINUX_PM_H
22 #define _LINUX_PM_H
23
24 #include <linux/list.h>
25 #include <linux/workqueue.h>
26 #include <linux/spinlock.h>
27 #include <linux/wait.h>
28 #include <linux/timer.h>
29 #include <linux/completion.h>
30
31 /*
32 * Callbacks for platform drivers to implement.
33 */
34 extern void (*pm_idle)(void);
35 extern void (*pm_power_off)(void);
36 extern void (*pm_power_off_prepare)(void);
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 * Several driver power state transitions are externally visible, affecting
58 * the state of pending I/O queues and (for drivers that touch hardware)
59 * interrupts, wakeups, DMA, and other hardware state. There may also be
60 * internal transitions to various low power modes, which are transparent
61 * to the rest of the driver stack (such as a driver that's ON gating off
62 * clocks which are not in active use).
63 *
64 * The externally visible transitions are handled with the help of the following
65 * callbacks included in this structure:
66 *
67 * @prepare: Prepare the device for the upcoming transition, but do NOT change
68 * its hardware state. Prevent new children of the device from being
69 * registered after @prepare() returns (the driver's subsystem and
70 * generally the rest of the kernel is supposed to prevent new calls to the
71 * probe method from being made too once @prepare() has succeeded). If
72 * @prepare() detects a situation it cannot handle (e.g. registration of a
73 * child already in progress), it may return -EAGAIN, so that the PM core
74 * can execute it once again (e.g. after the new child has been registered)
75 * to recover from the race condition. This method is executed for all
76 * kinds of suspend transitions and is followed by one of the suspend
77 * callbacks: @suspend(), @freeze(), or @poweroff().
78 * The PM core executes @prepare() for all devices before starting to
79 * execute suspend callbacks for any of them, so drivers may assume all of
80 * the other devices to be present and functional while @prepare() is being
81 * executed. In particular, it is safe to make GFP_KERNEL memory
82 * allocations from within @prepare(). However, drivers may NOT assume
83 * anything about the availability of the user space at that time and it
84 * is not correct to request firmware from within @prepare() (it's too
85 * late to do that). [To work around this limitation, drivers may
86 * register suspend and hibernation notifiers that are executed before the
87 * freezing of tasks.]
88 *
89 * @complete: Undo the changes made by @prepare(). This method is executed for
90 * all kinds of resume transitions, following one of the resume callbacks:
91 * @resume(), @thaw(), @restore(). Also called if the state transition
92 * fails before the driver's suspend callback (@suspend(), @freeze(),
93 * @poweroff()) can be executed (e.g. if the suspend callback fails for one
94 * of the other devices that the PM core has unsuccessfully attempted to
95 * suspend earlier).
96 * The PM core executes @complete() after it has executed the appropriate
97 * resume callback for all devices.
98 *
99 * @suspend: Executed before putting the system into a sleep state in which the
100 * contents of main memory are preserved. Quiesce the device, put it into
101 * a low power state appropriate for the upcoming system state (such as
102 * PCI_D3hot), and enable wakeup events as appropriate.
103 *
104 * @resume: Executed after waking the system up from a sleep state in which the
105 * contents of main memory were preserved. Put the device into the
106 * appropriate state, according to the information saved in memory by the
107 * preceding @suspend(). The driver starts working again, responding to
108 * hardware events and software requests. The hardware may have gone
109 * through a power-off reset, or it may have maintained state from the
110 * previous suspend() which the driver may rely on while resuming. On most
111 * platforms, there are no restrictions on availability of resources like
112 * clocks during @resume().
113 *
114 * @freeze: Hibernation-specific, executed before creating a hibernation image.
115 * Quiesce operations so that a consistent image can be created, but do NOT
116 * otherwise put the device into a low power device state and do NOT emit
117 * system wakeup events. Save in main memory the device settings to be
118 * used by @restore() during the subsequent resume from hibernation or by
119 * the subsequent @thaw(), if the creation of the image or the restoration
120 * of main memory contents from it fails.
121 *
122 * @thaw: Hibernation-specific, executed after creating a hibernation image OR
123 * if the creation of the image fails. Also executed after a failing
124 * attempt to restore the contents of main memory from such an image.
125 * Undo the changes made by the preceding @freeze(), so the device can be
126 * operated in the same way as immediately before the call to @freeze().
127 *
128 * @poweroff: Hibernation-specific, executed after saving a hibernation image.
129 * Quiesce the device, put it into a low power state appropriate for the
130 * upcoming system state (such as PCI_D3hot), and enable wakeup events as
131 * appropriate.
132 *
133 * @restore: Hibernation-specific, executed after restoring the contents of main
134 * memory from a hibernation image. Driver starts working again,
135 * responding to hardware events and software requests. Drivers may NOT
136 * make ANY assumptions about the hardware state right prior to @restore().
137 * On most platforms, there are no restrictions on availability of
138 * resources like clocks during @restore().
139 *
140 * @suspend_noirq: Complete the operations of ->suspend() by carrying out any
141 * actions required for suspending the device that need interrupts to be
142 * disabled
143 *
144 * @resume_noirq: Prepare for the execution of ->resume() by carrying out any
145 * actions required for resuming the device that need interrupts to be
146 * disabled
147 *
148 * @freeze_noirq: Complete the operations of ->freeze() by carrying out any
149 * actions required for freezing the device that need interrupts to be
150 * disabled
151 *
152 * @thaw_noirq: Prepare for the execution of ->thaw() by carrying out any
153 * actions required for thawing the device that need interrupts to be
154 * disabled
155 *
156 * @poweroff_noirq: Complete the operations of ->poweroff() by carrying out any
157 * actions required for handling the device that need interrupts to be
158 * disabled
159 *
160 * @restore_noirq: Prepare for the execution of ->restore() by carrying out any
161 * actions required for restoring the operations of the device that need
162 * interrupts to be disabled
163 *
164 * All of the above callbacks, except for @complete(), return error codes.
165 * However, the error codes returned by the resume operations, @resume(),
166 * @thaw(), @restore(), @resume_noirq(), @thaw_noirq(), and @restore_noirq() do
167 * not cause the PM core to abort the resume transition during which they are
168 * returned. The error codes returned in that cases are only printed by the PM
169 * core to the system logs for debugging purposes. Still, it is recommended
170 * that drivers only return error codes from their resume methods in case of an
171 * unrecoverable failure (i.e. when the device being handled refuses to resume
172 * and becomes unusable) to allow us to modify the PM core in the future, so
173 * that it can avoid attempting to handle devices that failed to resume and
174 * their children.
175 *
176 * It is allowed to unregister devices while the above callbacks are being
177 * executed. However, it is not allowed to unregister a device from within any
178 * of its own callbacks.
179 *
180 * There also are the following callbacks related to run-time power management
181 * of devices:
182 *
183 * @runtime_suspend: Prepare the device for a condition in which it won't be
184 * able to communicate with the CPU(s) and RAM due to power management.
185 * This need not mean that the device should be put into a low power state.
186 * For example, if the device is behind a link which is about to be turned
187 * off, the device may remain at full power. If the device does go to low
188 * power and is capable of generating run-time wake-up events, remote
189 * wake-up (i.e., a hardware mechanism allowing the device to request a
190 * change of its power state via a wake-up event, such as PCI PME) should
191 * be enabled for it.
192 *
193 * @runtime_resume: Put the device into the fully active state in response to a
194 * wake-up event generated by hardware or at the request of software. If
195 * necessary, put the device into the full power state and restore its
196 * registers, so that it is fully operational.
197 *
198 * @runtime_idle: Device appears to be inactive and it might be put into a low
199 * power state if all of the necessary conditions are satisfied. Check
200 * these conditions and handle the device as appropriate, possibly queueing
201 * a suspend request for it. The return value is ignored by the PM core.
202 */
203
204 struct dev_pm_ops {
205 int (*prepare)(struct device *dev);
206 void (*complete)(struct device *dev);
207 int (*suspend)(struct device *dev);
208 int (*resume)(struct device *dev);
209 int (*freeze)(struct device *dev);
210 int (*thaw)(struct device *dev);
211 int (*poweroff)(struct device *dev);
212 int (*restore)(struct device *dev);
213 int (*suspend_noirq)(struct device *dev);
214 int (*resume_noirq)(struct device *dev);
215 int (*freeze_noirq)(struct device *dev);
216 int (*thaw_noirq)(struct device *dev);
217 int (*poweroff_noirq)(struct device *dev);
218 int (*restore_noirq)(struct device *dev);
219 int (*runtime_suspend)(struct device *dev);
220 int (*runtime_resume)(struct device *dev);
221 int (*runtime_idle)(struct device *dev);
222 };
223
224 #ifdef CONFIG_PM_SLEEP
225 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
226 .suspend = suspend_fn, \
227 .resume = resume_fn, \
228 .freeze = suspend_fn, \
229 .thaw = resume_fn, \
230 .poweroff = suspend_fn, \
231 .restore = resume_fn,
232 #else
233 #define SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn)
234 #endif
235
236 #ifdef CONFIG_PM_RUNTIME
237 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
238 .runtime_suspend = suspend_fn, \
239 .runtime_resume = resume_fn, \
240 .runtime_idle = idle_fn,
241 #else
242 #define SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn)
243 #endif
244
245 /*
246 * Use this if you want to use the same suspend and resume callbacks for suspend
247 * to RAM and hibernation.
248 */
249 #define SIMPLE_DEV_PM_OPS(name, suspend_fn, resume_fn) \
250 const struct dev_pm_ops name = { \
251 SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
252 }
253
254 /*
255 * Use this for defining a set of PM operations to be used in all situations
256 * (sustem suspend, hibernation or runtime PM).
257 */
258 #define UNIVERSAL_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
259 const struct dev_pm_ops name = { \
260 SET_SYSTEM_SLEEP_PM_OPS(suspend_fn, resume_fn) \
261 SET_RUNTIME_PM_OPS(suspend_fn, resume_fn, idle_fn) \
262 }
263
264 /*
265 * Use this for subsystems (bus types, device types, device classes) that don't
266 * need any special suspend/resume handling in addition to invoking the PM
267 * callbacks provided by device drivers supporting both the system sleep PM and
268 * runtime PM, make the pm member point to generic_subsys_pm_ops.
269 */
270 #ifdef CONFIG_PM
271 extern struct dev_pm_ops generic_subsys_pm_ops;
272 #define GENERIC_SUBSYS_PM_OPS (&generic_subsys_pm_ops)
273 #else
274 #define GENERIC_SUBSYS_PM_OPS NULL
275 #endif
276
277 /**
278 * PM_EVENT_ messages
279 *
280 * The following PM_EVENT_ messages are defined for the internal use of the PM
281 * core, in order to provide a mechanism allowing the high level suspend and
282 * hibernation code to convey the necessary information to the device PM core
283 * code:
284 *
285 * ON No transition.
286 *
287 * FREEZE System is going to hibernate, call ->prepare() and ->freeze()
288 * for all devices.
289 *
290 * SUSPEND System is going to suspend, call ->prepare() and ->suspend()
291 * for all devices.
292 *
293 * HIBERNATE Hibernation image has been saved, call ->prepare() and
294 * ->poweroff() for all devices.
295 *
296 * QUIESCE Contents of main memory are going to be restored from a (loaded)
297 * hibernation image, call ->prepare() and ->freeze() for all
298 * devices.
299 *
300 * RESUME System is resuming, call ->resume() and ->complete() for all
301 * devices.
302 *
303 * THAW Hibernation image has been created, call ->thaw() and
304 * ->complete() for all devices.
305 *
306 * RESTORE Contents of main memory have been restored from a hibernation
307 * image, call ->restore() and ->complete() for all devices.
308 *
309 * RECOVER Creation of a hibernation image or restoration of the main
310 * memory contents from a hibernation image has failed, call
311 * ->thaw() and ->complete() for all devices.
312 *
313 * The following PM_EVENT_ messages are defined for internal use by
314 * kernel subsystems. They are never issued by the PM core.
315 *
316 * USER_SUSPEND Manual selective suspend was issued by userspace.
317 *
318 * USER_RESUME Manual selective resume was issued by userspace.
319 *
320 * REMOTE_WAKEUP Remote-wakeup request was received from the device.
321 *
322 * AUTO_SUSPEND Automatic (device idle) runtime suspend was
323 * initiated by the subsystem.
324 *
325 * AUTO_RESUME Automatic (device needed) runtime resume was
326 * requested by a driver.
327 */
328
329 #define PM_EVENT_ON 0x0000
330 #define PM_EVENT_FREEZE 0x0001
331 #define PM_EVENT_SUSPEND 0x0002
332 #define PM_EVENT_HIBERNATE 0x0004
333 #define PM_EVENT_QUIESCE 0x0008
334 #define PM_EVENT_RESUME 0x0010
335 #define PM_EVENT_THAW 0x0020
336 #define PM_EVENT_RESTORE 0x0040
337 #define PM_EVENT_RECOVER 0x0080
338 #define PM_EVENT_USER 0x0100
339 #define PM_EVENT_REMOTE 0x0200
340 #define PM_EVENT_AUTO 0x0400
341
342 #define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
343 #define PM_EVENT_USER_SUSPEND (PM_EVENT_USER | PM_EVENT_SUSPEND)
344 #define PM_EVENT_USER_RESUME (PM_EVENT_USER | PM_EVENT_RESUME)
345 #define PM_EVENT_REMOTE_RESUME (PM_EVENT_REMOTE | PM_EVENT_RESUME)
346 #define PM_EVENT_AUTO_SUSPEND (PM_EVENT_AUTO | PM_EVENT_SUSPEND)
347 #define PM_EVENT_AUTO_RESUME (PM_EVENT_AUTO | PM_EVENT_RESUME)
348
349 #define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
350 #define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
351 #define PMSG_QUIESCE ((struct pm_message){ .event = PM_EVENT_QUIESCE, })
352 #define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
353 #define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
354 #define PMSG_RESUME ((struct pm_message){ .event = PM_EVENT_RESUME, })
355 #define PMSG_THAW ((struct pm_message){ .event = PM_EVENT_THAW, })
356 #define PMSG_RESTORE ((struct pm_message){ .event = PM_EVENT_RESTORE, })
357 #define PMSG_RECOVER ((struct pm_message){ .event = PM_EVENT_RECOVER, })
358 #define PMSG_USER_SUSPEND ((struct pm_message) \
359 { .event = PM_EVENT_USER_SUSPEND, })
360 #define PMSG_USER_RESUME ((struct pm_message) \
361 { .event = PM_EVENT_USER_RESUME, })
362 #define PMSG_REMOTE_RESUME ((struct pm_message) \
363 { .event = PM_EVENT_REMOTE_RESUME, })
364 #define PMSG_AUTO_SUSPEND ((struct pm_message) \
365 { .event = PM_EVENT_AUTO_SUSPEND, })
366 #define PMSG_AUTO_RESUME ((struct pm_message) \
367 { .event = PM_EVENT_AUTO_RESUME, })
368
369 /**
370 * Device run-time power management status.
371 *
372 * These status labels are used internally by the PM core to indicate the
373 * current status of a device with respect to the PM core operations. They do
374 * not reflect the actual power state of the device or its status as seen by the
375 * driver.
376 *
377 * RPM_ACTIVE Device is fully operational. Indicates that the device
378 * bus type's ->runtime_resume() callback has completed
379 * successfully.
380 *
381 * RPM_SUSPENDED Device bus type's ->runtime_suspend() callback has
382 * completed successfully. The device is regarded as
383 * suspended.
384 *
385 * RPM_RESUMING Device bus type's ->runtime_resume() callback is being
386 * executed.
387 *
388 * RPM_SUSPENDING Device bus type's ->runtime_suspend() callback is being
389 * executed.
390 */
391
392 enum rpm_status {
393 RPM_ACTIVE = 0,
394 RPM_RESUMING,
395 RPM_SUSPENDED,
396 RPM_SUSPENDING,
397 };
398
399 /**
400 * Device run-time power management request types.
401 *
402 * RPM_REQ_NONE Do nothing.
403 *
404 * RPM_REQ_IDLE Run the device bus type's ->runtime_idle() callback
405 *
406 * RPM_REQ_SUSPEND Run the device bus type's ->runtime_suspend() callback
407 *
408 * RPM_REQ_AUTOSUSPEND Same as RPM_REQ_SUSPEND, but not until the device has
409 * been inactive for as long as power.autosuspend_delay
410 *
411 * RPM_REQ_RESUME Run the device bus type's ->runtime_resume() callback
412 */
413
414 enum rpm_request {
415 RPM_REQ_NONE = 0,
416 RPM_REQ_IDLE,
417 RPM_REQ_SUSPEND,
418 RPM_REQ_AUTOSUSPEND,
419 RPM_REQ_RESUME,
420 };
421
422 struct wakeup_source;
423
424 struct dev_pm_info {
425 pm_message_t power_state;
426 unsigned int can_wakeup:1;
427 unsigned int async_suspend:1;
428 unsigned int in_suspend:1; /* Owned by the PM core */
429 spinlock_t lock;
430 #ifdef CONFIG_PM_SLEEP
431 struct list_head entry;
432 struct completion completion;
433 struct wakeup_source *wakeup;
434 #else
435 unsigned int should_wakeup:1;
436 #endif
437 #ifdef CONFIG_PM_RUNTIME
438 struct timer_list suspend_timer;
439 unsigned long timer_expires;
440 struct work_struct work;
441 wait_queue_head_t wait_queue;
442 atomic_t usage_count;
443 atomic_t child_count;
444 unsigned int disable_depth:3;
445 unsigned int ignore_children:1;
446 unsigned int idle_notification:1;
447 unsigned int request_pending:1;
448 unsigned int deferred_resume:1;
449 unsigned int run_wake:1;
450 unsigned int runtime_auto:1;
451 unsigned int no_callbacks:1;
452 unsigned int irq_safe:1;
453 unsigned int use_autosuspend:1;
454 unsigned int timer_autosuspends:1;
455 enum rpm_request request;
456 enum rpm_status runtime_status;
457 int runtime_error;
458 int autosuspend_delay;
459 unsigned long last_busy;
460 unsigned long active_jiffies;
461 unsigned long suspended_jiffies;
462 unsigned long accounting_timestamp;
463 #endif
464 };
465
466 extern void update_pm_runtime_accounting(struct device *dev);
467
468 /*
469 * Power domains provide callbacks that are executed during system suspend,
470 * hibernation, system resume and during runtime PM transitions along with
471 * subsystem-level and driver-level callbacks.
472 */
473 struct dev_power_domain {
474 struct dev_pm_ops ops;
475 };
476
477 /*
478 * The PM_EVENT_ messages are also used by drivers implementing the legacy
479 * suspend framework, based on the ->suspend() and ->resume() callbacks common
480 * for suspend and hibernation transitions, according to the rules below.
481 */
482
483 /* Necessary, because several drivers use PM_EVENT_PRETHAW */
484 #define PM_EVENT_PRETHAW PM_EVENT_QUIESCE
485
486 /*
487 * One transition is triggered by resume(), after a suspend() call; the
488 * message is implicit:
489 *
490 * ON Driver starts working again, responding to hardware events
491 * and software requests. The hardware may have gone through
492 * a power-off reset, or it may have maintained state from the
493 * previous suspend() which the driver will rely on while
494 * resuming. On most platforms, there are no restrictions on
495 * availability of resources like clocks during resume().
496 *
497 * Other transitions are triggered by messages sent using suspend(). All
498 * these transitions quiesce the driver, so that I/O queues are inactive.
499 * That commonly entails turning off IRQs and DMA; there may be rules
500 * about how to quiesce that are specific to the bus or the device's type.
501 * (For example, network drivers mark the link state.) Other details may
502 * differ according to the message:
503 *
504 * SUSPEND Quiesce, enter a low power device state appropriate for
505 * the upcoming system state (such as PCI_D3hot), and enable
506 * wakeup events as appropriate.
507 *
508 * HIBERNATE Enter a low power device state appropriate for the hibernation
509 * state (eg. ACPI S4) and enable wakeup events as appropriate.
510 *
511 * FREEZE Quiesce operations so that a consistent image can be saved;
512 * but do NOT otherwise enter a low power device state, and do
513 * NOT emit system wakeup events.
514 *
515 * PRETHAW Quiesce as if for FREEZE; additionally, prepare for restoring
516 * the system from a snapshot taken after an earlier FREEZE.
517 * Some drivers will need to reset their hardware state instead
518 * of preserving it, to ensure that it's never mistaken for the
519 * state which that earlier snapshot had set up.
520 *
521 * A minimally power-aware driver treats all messages as SUSPEND, fully
522 * reinitializes its device during resume() -- whether or not it was reset
523 * during the suspend/resume cycle -- and can't issue wakeup events.
524 *
525 * More power-aware drivers may also use low power states at runtime as
526 * well as during system sleep states like PM_SUSPEND_STANDBY. They may
527 * be able to use wakeup events to exit from runtime low-power states,
528 * or from system low-power states such as standby or suspend-to-RAM.
529 */
530
531 #ifdef CONFIG_PM_SLEEP
532 #ifndef CONFIG_ARCH_NO_SYSDEV_OPS
533 extern int sysdev_suspend(pm_message_t state);
534 extern int sysdev_resume(void);
535 #else
sysdev_suspend(pm_message_t state)536 static inline int sysdev_suspend(pm_message_t state) { return 0; }
sysdev_resume(void)537 static inline int sysdev_resume(void) { return 0; }
538 #endif
539
540 extern void device_pm_lock(void);
541 extern void dpm_resume_noirq(pm_message_t state);
542 extern void dpm_resume_end(pm_message_t state);
543
544 extern void device_pm_unlock(void);
545 extern int dpm_suspend_noirq(pm_message_t state);
546 extern int dpm_suspend_start(pm_message_t state);
547
548 extern void __suspend_report_result(const char *function, void *fn, int ret);
549
550 #define suspend_report_result(fn, ret) \
551 do { \
552 __suspend_report_result(__func__, fn, ret); \
553 } while (0)
554
555 extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
556 #else /* !CONFIG_PM_SLEEP */
557
558 #define device_pm_lock() do {} while (0)
559 #define device_pm_unlock() do {} while (0)
560
dpm_suspend_start(pm_message_t state)561 static inline int dpm_suspend_start(pm_message_t state)
562 {
563 return 0;
564 }
565
566 #define suspend_report_result(fn, ret) do {} while (0)
567
device_pm_wait_for_dev(struct device * a,struct device * b)568 static inline int device_pm_wait_for_dev(struct device *a, struct device *b)
569 {
570 return 0;
571 }
572 #endif /* !CONFIG_PM_SLEEP */
573
574 /* How to reorder dpm_list after device_move() */
575 enum dpm_order {
576 DPM_ORDER_NONE,
577 DPM_ORDER_DEV_AFTER_PARENT,
578 DPM_ORDER_PARENT_BEFORE_DEV,
579 DPM_ORDER_DEV_LAST,
580 };
581
582 extern int pm_generic_suspend(struct device *dev);
583 extern int pm_generic_resume(struct device *dev);
584 extern int pm_generic_freeze(struct device *dev);
585 extern int pm_generic_thaw(struct device *dev);
586 extern int pm_generic_restore(struct device *dev);
587 extern int pm_generic_poweroff(struct device *dev);
588
589 #endif /* _LINUX_PM_H */
590