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1 | /* | |
2 | * kernel/power/main.c - PM subsystem core functionality. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/export.h> | |
12 | #include <linux/kobject.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/resume-trace.h> | |
15 | #include <linux/workqueue.h> | |
16 | #include <linux/debugfs.h> | |
17 | #include <linux/seq_file.h> | |
18 | ||
19 | #include "power.h" | |
20 | ||
21 | DEFINE_MUTEX(pm_mutex); | |
22 | ||
23 | #ifdef CONFIG_PM_SLEEP | |
24 | ||
25 | /* Routines for PM-transition notifications */ | |
26 | ||
27 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
28 | ||
29 | int register_pm_notifier(struct notifier_block *nb) | |
30 | { | |
31 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
32 | } | |
33 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
34 | ||
35 | int unregister_pm_notifier(struct notifier_block *nb) | |
36 | { | |
37 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
38 | } | |
39 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
40 | ||
41 | int pm_notifier_call_chain(unsigned long val) | |
42 | { | |
43 | int ret = blocking_notifier_call_chain(&pm_chain_head, val, NULL); | |
44 | ||
45 | return notifier_to_errno(ret); | |
46 | } | |
47 | ||
48 | /* If set, devices may be suspended and resumed asynchronously. */ | |
49 | int pm_async_enabled = 1; | |
50 | ||
51 | static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, | |
52 | char *buf) | |
53 | { | |
54 | return sprintf(buf, "%d\n", pm_async_enabled); | |
55 | } | |
56 | ||
57 | static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, | |
58 | const char *buf, size_t n) | |
59 | { | |
60 | unsigned long val; | |
61 | ||
62 | if (kstrtoul(buf, 10, &val)) | |
63 | return -EINVAL; | |
64 | ||
65 | if (val > 1) | |
66 | return -EINVAL; | |
67 | ||
68 | pm_async_enabled = val; | |
69 | return n; | |
70 | } | |
71 | ||
72 | power_attr(pm_async); | |
73 | ||
74 | #ifdef CONFIG_PM_DEBUG | |
75 | int pm_test_level = TEST_NONE; | |
76 | ||
77 | static const char * const pm_tests[__TEST_AFTER_LAST] = { | |
78 | [TEST_NONE] = "none", | |
79 | [TEST_CORE] = "core", | |
80 | [TEST_CPUS] = "processors", | |
81 | [TEST_PLATFORM] = "platform", | |
82 | [TEST_DEVICES] = "devices", | |
83 | [TEST_FREEZER] = "freezer", | |
84 | }; | |
85 | ||
86 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, | |
87 | char *buf) | |
88 | { | |
89 | char *s = buf; | |
90 | int level; | |
91 | ||
92 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
93 | if (pm_tests[level]) { | |
94 | if (level == pm_test_level) | |
95 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
96 | else | |
97 | s += sprintf(s, "%s ", pm_tests[level]); | |
98 | } | |
99 | ||
100 | if (s != buf) | |
101 | /* convert the last space to a newline */ | |
102 | *(s-1) = '\n'; | |
103 | ||
104 | return (s - buf); | |
105 | } | |
106 | ||
107 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, | |
108 | const char *buf, size_t n) | |
109 | { | |
110 | const char * const *s; | |
111 | int level; | |
112 | char *p; | |
113 | int len; | |
114 | int error = -EINVAL; | |
115 | ||
116 | p = memchr(buf, '\n', n); | |
117 | len = p ? p - buf : n; | |
118 | ||
119 | lock_system_sleep(); | |
120 | ||
121 | level = TEST_FIRST; | |
122 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
123 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
124 | pm_test_level = level; | |
125 | error = 0; | |
126 | break; | |
127 | } | |
128 | ||
129 | unlock_system_sleep(); | |
130 | ||
131 | return error ? error : n; | |
132 | } | |
133 | ||
134 | power_attr(pm_test); | |
135 | #endif /* CONFIG_PM_DEBUG */ | |
136 | ||
137 | #ifdef CONFIG_DEBUG_FS | |
138 | static char *suspend_step_name(enum suspend_stat_step step) | |
139 | { | |
140 | switch (step) { | |
141 | case SUSPEND_FREEZE: | |
142 | return "freeze"; | |
143 | case SUSPEND_PREPARE: | |
144 | return "prepare"; | |
145 | case SUSPEND_SUSPEND: | |
146 | return "suspend"; | |
147 | case SUSPEND_SUSPEND_NOIRQ: | |
148 | return "suspend_noirq"; | |
149 | case SUSPEND_RESUME_NOIRQ: | |
150 | return "resume_noirq"; | |
151 | case SUSPEND_RESUME: | |
152 | return "resume"; | |
153 | default: | |
154 | return ""; | |
155 | } | |
156 | } | |
157 | ||
158 | static int suspend_stats_show(struct seq_file *s, void *unused) | |
159 | { | |
160 | int i, index, last_dev, last_errno, last_step; | |
161 | ||
162 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
163 | last_dev %= REC_FAILED_NUM; | |
164 | last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
165 | last_errno %= REC_FAILED_NUM; | |
166 | last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
167 | last_step %= REC_FAILED_NUM; | |
168 | seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" | |
169 | "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", | |
170 | "success", suspend_stats.success, | |
171 | "fail", suspend_stats.fail, | |
172 | "failed_freeze", suspend_stats.failed_freeze, | |
173 | "failed_prepare", suspend_stats.failed_prepare, | |
174 | "failed_suspend", suspend_stats.failed_suspend, | |
175 | "failed_suspend_late", | |
176 | suspend_stats.failed_suspend_late, | |
177 | "failed_suspend_noirq", | |
178 | suspend_stats.failed_suspend_noirq, | |
179 | "failed_resume", suspend_stats.failed_resume, | |
180 | "failed_resume_early", | |
181 | suspend_stats.failed_resume_early, | |
182 | "failed_resume_noirq", | |
183 | suspend_stats.failed_resume_noirq); | |
184 | seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", | |
185 | suspend_stats.failed_devs[last_dev]); | |
186 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
187 | index = last_dev + REC_FAILED_NUM - i; | |
188 | index %= REC_FAILED_NUM; | |
189 | seq_printf(s, "\t\t\t%-s\n", | |
190 | suspend_stats.failed_devs[index]); | |
191 | } | |
192 | seq_printf(s, " last_failed_errno:\t%-d\n", | |
193 | suspend_stats.errno[last_errno]); | |
194 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
195 | index = last_errno + REC_FAILED_NUM - i; | |
196 | index %= REC_FAILED_NUM; | |
197 | seq_printf(s, "\t\t\t%-d\n", | |
198 | suspend_stats.errno[index]); | |
199 | } | |
200 | seq_printf(s, " last_failed_step:\t%-s\n", | |
201 | suspend_step_name( | |
202 | suspend_stats.failed_steps[last_step])); | |
203 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
204 | index = last_step + REC_FAILED_NUM - i; | |
205 | index %= REC_FAILED_NUM; | |
206 | seq_printf(s, "\t\t\t%-s\n", | |
207 | suspend_step_name( | |
208 | suspend_stats.failed_steps[index])); | |
209 | } | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static int suspend_stats_open(struct inode *inode, struct file *file) | |
215 | { | |
216 | return single_open(file, suspend_stats_show, NULL); | |
217 | } | |
218 | ||
219 | static const struct file_operations suspend_stats_operations = { | |
220 | .open = suspend_stats_open, | |
221 | .read = seq_read, | |
222 | .llseek = seq_lseek, | |
223 | .release = single_release, | |
224 | }; | |
225 | ||
226 | static int __init pm_debugfs_init(void) | |
227 | { | |
228 | debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, | |
229 | NULL, NULL, &suspend_stats_operations); | |
230 | return 0; | |
231 | } | |
232 | ||
233 | late_initcall(pm_debugfs_init); | |
234 | #endif /* CONFIG_DEBUG_FS */ | |
235 | ||
236 | #endif /* CONFIG_PM_SLEEP */ | |
237 | ||
238 | #ifdef CONFIG_PM_SLEEP_DEBUG | |
239 | /* | |
240 | * pm_print_times: print time taken by devices to suspend and resume. | |
241 | * | |
242 | * show() returns whether printing of suspend and resume times is enabled. | |
243 | * store() accepts 0 or 1. 0 disables printing and 1 enables it. | |
244 | */ | |
245 | bool pm_print_times_enabled; | |
246 | ||
247 | static ssize_t pm_print_times_show(struct kobject *kobj, | |
248 | struct kobj_attribute *attr, char *buf) | |
249 | { | |
250 | return sprintf(buf, "%d\n", pm_print_times_enabled); | |
251 | } | |
252 | ||
253 | static ssize_t pm_print_times_store(struct kobject *kobj, | |
254 | struct kobj_attribute *attr, | |
255 | const char *buf, size_t n) | |
256 | { | |
257 | unsigned long val; | |
258 | ||
259 | if (kstrtoul(buf, 10, &val)) | |
260 | return -EINVAL; | |
261 | ||
262 | if (val > 1) | |
263 | return -EINVAL; | |
264 | ||
265 | pm_print_times_enabled = !!val; | |
266 | return n; | |
267 | } | |
268 | ||
269 | power_attr(pm_print_times); | |
270 | ||
271 | static inline void pm_print_times_init(void) | |
272 | { | |
273 | pm_print_times_enabled = !!initcall_debug; | |
274 | } | |
275 | #else /* !CONFIG_PP_SLEEP_DEBUG */ | |
276 | static inline void pm_print_times_init(void) {} | |
277 | #endif /* CONFIG_PM_SLEEP_DEBUG */ | |
278 | ||
279 | struct kobject *power_kobj; | |
280 | ||
281 | /** | |
282 | * state - control system power state. | |
283 | * | |
284 | * show() returns what states are supported, which is hard-coded to | |
285 | * 'freeze' (Low-Power Idle), 'standby' (Power-On Suspend), | |
286 | * 'mem' (Suspend-to-RAM), and 'disk' (Suspend-to-Disk). | |
287 | * | |
288 | * store() accepts one of those strings, translates it into the | |
289 | * proper enumerated value, and initiates a suspend transition. | |
290 | */ | |
291 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, | |
292 | char *buf) | |
293 | { | |
294 | char *s = buf; | |
295 | #ifdef CONFIG_SUSPEND | |
296 | int i; | |
297 | ||
298 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
299 | if (pm_states[i] && valid_state(i)) | |
300 | s += sprintf(s,"%s ", pm_states[i]); | |
301 | } | |
302 | #endif | |
303 | #ifdef CONFIG_HIBERNATION | |
304 | s += sprintf(s, "%s\n", "disk"); | |
305 | #else | |
306 | if (s != buf) | |
307 | /* convert the last space to a newline */ | |
308 | *(s-1) = '\n'; | |
309 | #endif | |
310 | return (s - buf); | |
311 | } | |
312 | ||
313 | static suspend_state_t decode_state(const char *buf, size_t n) | |
314 | { | |
315 | #ifdef CONFIG_SUSPEND | |
316 | suspend_state_t state = PM_SUSPEND_MIN; | |
317 | const char * const *s; | |
318 | #endif | |
319 | char *p; | |
320 | int len; | |
321 | ||
322 | p = memchr(buf, '\n', n); | |
323 | len = p ? p - buf : n; | |
324 | ||
325 | /* Check hibernation first. */ | |
326 | if (len == 4 && !strncmp(buf, "disk", len)) | |
327 | return PM_SUSPEND_MAX; | |
328 | ||
329 | #ifdef CONFIG_SUSPEND | |
330 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) | |
331 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) | |
332 | return state; | |
333 | #endif | |
334 | ||
335 | return PM_SUSPEND_ON; | |
336 | } | |
337 | ||
338 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, | |
339 | const char *buf, size_t n) | |
340 | { | |
341 | suspend_state_t state; | |
342 | int error; | |
343 | ||
344 | error = pm_autosleep_lock(); | |
345 | if (error) | |
346 | return error; | |
347 | ||
348 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
349 | error = -EBUSY; | |
350 | goto out; | |
351 | } | |
352 | ||
353 | state = decode_state(buf, n); | |
354 | if (state < PM_SUSPEND_MAX) | |
355 | error = pm_suspend(state); | |
356 | else if (state == PM_SUSPEND_MAX) | |
357 | error = hibernate(); | |
358 | else | |
359 | error = -EINVAL; | |
360 | ||
361 | out: | |
362 | pm_autosleep_unlock(); | |
363 | return error ? error : n; | |
364 | } | |
365 | ||
366 | power_attr(state); | |
367 | ||
368 | #ifdef CONFIG_PM_SLEEP | |
369 | /* | |
370 | * The 'wakeup_count' attribute, along with the functions defined in | |
371 | * drivers/base/power/wakeup.c, provides a means by which wakeup events can be | |
372 | * handled in a non-racy way. | |
373 | * | |
374 | * If a wakeup event occurs when the system is in a sleep state, it simply is | |
375 | * woken up. In turn, if an event that would wake the system up from a sleep | |
376 | * state occurs when it is undergoing a transition to that sleep state, the | |
377 | * transition should be aborted. Moreover, if such an event occurs when the | |
378 | * system is in the working state, an attempt to start a transition to the | |
379 | * given sleep state should fail during certain period after the detection of | |
380 | * the event. Using the 'state' attribute alone is not sufficient to satisfy | |
381 | * these requirements, because a wakeup event may occur exactly when 'state' | |
382 | * is being written to and may be delivered to user space right before it is | |
383 | * frozen, so the event will remain only partially processed until the system is | |
384 | * woken up by another event. In particular, it won't cause the transition to | |
385 | * a sleep state to be aborted. | |
386 | * | |
387 | * This difficulty may be overcome if user space uses 'wakeup_count' before | |
388 | * writing to 'state'. It first should read from 'wakeup_count' and store | |
389 | * the read value. Then, after carrying out its own preparations for the system | |
390 | * transition to a sleep state, it should write the stored value to | |
391 | * 'wakeup_count'. If that fails, at least one wakeup event has occurred since | |
392 | * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it | |
393 | * is allowed to write to 'state', but the transition will be aborted if there | |
394 | * are any wakeup events detected after 'wakeup_count' was written to. | |
395 | */ | |
396 | ||
397 | static ssize_t wakeup_count_show(struct kobject *kobj, | |
398 | struct kobj_attribute *attr, | |
399 | char *buf) | |
400 | { | |
401 | unsigned int val; | |
402 | ||
403 | return pm_get_wakeup_count(&val, true) ? | |
404 | sprintf(buf, "%u\n", val) : -EINTR; | |
405 | } | |
406 | ||
407 | static ssize_t wakeup_count_store(struct kobject *kobj, | |
408 | struct kobj_attribute *attr, | |
409 | const char *buf, size_t n) | |
410 | { | |
411 | unsigned int val; | |
412 | int error; | |
413 | ||
414 | error = pm_autosleep_lock(); | |
415 | if (error) | |
416 | return error; | |
417 | ||
418 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
419 | error = -EBUSY; | |
420 | goto out; | |
421 | } | |
422 | ||
423 | error = -EINVAL; | |
424 | if (sscanf(buf, "%u", &val) == 1) { | |
425 | if (pm_save_wakeup_count(val)) | |
426 | error = n; | |
427 | else | |
428 | pm_print_active_wakeup_sources(); | |
429 | } | |
430 | ||
431 | out: | |
432 | pm_autosleep_unlock(); | |
433 | return error; | |
434 | } | |
435 | ||
436 | power_attr(wakeup_count); | |
437 | ||
438 | #ifdef CONFIG_PM_AUTOSLEEP | |
439 | static ssize_t autosleep_show(struct kobject *kobj, | |
440 | struct kobj_attribute *attr, | |
441 | char *buf) | |
442 | { | |
443 | suspend_state_t state = pm_autosleep_state(); | |
444 | ||
445 | if (state == PM_SUSPEND_ON) | |
446 | return sprintf(buf, "off\n"); | |
447 | ||
448 | #ifdef CONFIG_SUSPEND | |
449 | if (state < PM_SUSPEND_MAX) | |
450 | return sprintf(buf, "%s\n", valid_state(state) ? | |
451 | pm_states[state] : "error"); | |
452 | #endif | |
453 | #ifdef CONFIG_HIBERNATION | |
454 | return sprintf(buf, "disk\n"); | |
455 | #else | |
456 | return sprintf(buf, "error"); | |
457 | #endif | |
458 | } | |
459 | ||
460 | static ssize_t autosleep_store(struct kobject *kobj, | |
461 | struct kobj_attribute *attr, | |
462 | const char *buf, size_t n) | |
463 | { | |
464 | suspend_state_t state = decode_state(buf, n); | |
465 | int error; | |
466 | ||
467 | if (state == PM_SUSPEND_ON | |
468 | && strcmp(buf, "off") && strcmp(buf, "off\n")) | |
469 | return -EINVAL; | |
470 | ||
471 | error = pm_autosleep_set_state(state); | |
472 | return error ? error : n; | |
473 | } | |
474 | ||
475 | power_attr(autosleep); | |
476 | #endif /* CONFIG_PM_AUTOSLEEP */ | |
477 | ||
478 | #ifdef CONFIG_PM_WAKELOCKS | |
479 | static ssize_t wake_lock_show(struct kobject *kobj, | |
480 | struct kobj_attribute *attr, | |
481 | char *buf) | |
482 | { | |
483 | return pm_show_wakelocks(buf, true); | |
484 | } | |
485 | ||
486 | static ssize_t wake_lock_store(struct kobject *kobj, | |
487 | struct kobj_attribute *attr, | |
488 | const char *buf, size_t n) | |
489 | { | |
490 | int error = pm_wake_lock(buf); | |
491 | return error ? error : n; | |
492 | } | |
493 | ||
494 | power_attr(wake_lock); | |
495 | ||
496 | static ssize_t wake_unlock_show(struct kobject *kobj, | |
497 | struct kobj_attribute *attr, | |
498 | char *buf) | |
499 | { | |
500 | return pm_show_wakelocks(buf, false); | |
501 | } | |
502 | ||
503 | static ssize_t wake_unlock_store(struct kobject *kobj, | |
504 | struct kobj_attribute *attr, | |
505 | const char *buf, size_t n) | |
506 | { | |
507 | int error = pm_wake_unlock(buf); | |
508 | return error ? error : n; | |
509 | } | |
510 | ||
511 | power_attr(wake_unlock); | |
512 | ||
513 | #endif /* CONFIG_PM_WAKELOCKS */ | |
514 | #endif /* CONFIG_PM_SLEEP */ | |
515 | ||
516 | #ifdef CONFIG_PM_TRACE | |
517 | int pm_trace_enabled; | |
518 | ||
519 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, | |
520 | char *buf) | |
521 | { | |
522 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
523 | } | |
524 | ||
525 | static ssize_t | |
526 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, | |
527 | const char *buf, size_t n) | |
528 | { | |
529 | int val; | |
530 | ||
531 | if (sscanf(buf, "%d", &val) == 1) { | |
532 | pm_trace_enabled = !!val; | |
533 | if (pm_trace_enabled) { | |
534 | pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" | |
535 | "PM: Correct system time has to be restored manually after resume.\n"); | |
536 | } | |
537 | return n; | |
538 | } | |
539 | return -EINVAL; | |
540 | } | |
541 | ||
542 | power_attr(pm_trace); | |
543 | ||
544 | static ssize_t pm_trace_dev_match_show(struct kobject *kobj, | |
545 | struct kobj_attribute *attr, | |
546 | char *buf) | |
547 | { | |
548 | return show_trace_dev_match(buf, PAGE_SIZE); | |
549 | } | |
550 | ||
551 | static ssize_t | |
552 | pm_trace_dev_match_store(struct kobject *kobj, struct kobj_attribute *attr, | |
553 | const char *buf, size_t n) | |
554 | { | |
555 | return -EINVAL; | |
556 | } | |
557 | ||
558 | power_attr(pm_trace_dev_match); | |
559 | ||
560 | #endif /* CONFIG_PM_TRACE */ | |
561 | ||
562 | #ifdef CONFIG_FREEZER | |
563 | static ssize_t pm_freeze_timeout_show(struct kobject *kobj, | |
564 | struct kobj_attribute *attr, char *buf) | |
565 | { | |
566 | return sprintf(buf, "%u\n", freeze_timeout_msecs); | |
567 | } | |
568 | ||
569 | static ssize_t pm_freeze_timeout_store(struct kobject *kobj, | |
570 | struct kobj_attribute *attr, | |
571 | const char *buf, size_t n) | |
572 | { | |
573 | unsigned long val; | |
574 | ||
575 | if (kstrtoul(buf, 10, &val)) | |
576 | return -EINVAL; | |
577 | ||
578 | freeze_timeout_msecs = val; | |
579 | return n; | |
580 | } | |
581 | ||
582 | power_attr(pm_freeze_timeout); | |
583 | ||
584 | #endif /* CONFIG_FREEZER*/ | |
585 | ||
586 | static struct attribute * g[] = { | |
587 | &state_attr.attr, | |
588 | #ifdef CONFIG_PM_TRACE | |
589 | &pm_trace_attr.attr, | |
590 | &pm_trace_dev_match_attr.attr, | |
591 | #endif | |
592 | #ifdef CONFIG_PM_SLEEP | |
593 | &pm_async_attr.attr, | |
594 | &wakeup_count_attr.attr, | |
595 | #ifdef CONFIG_PM_AUTOSLEEP | |
596 | &autosleep_attr.attr, | |
597 | #endif | |
598 | #ifdef CONFIG_PM_WAKELOCKS | |
599 | &wake_lock_attr.attr, | |
600 | &wake_unlock_attr.attr, | |
601 | #endif | |
602 | #ifdef CONFIG_PM_DEBUG | |
603 | &pm_test_attr.attr, | |
604 | #endif | |
605 | #ifdef CONFIG_PM_SLEEP_DEBUG | |
606 | &pm_print_times_attr.attr, | |
607 | #endif | |
608 | #endif | |
609 | #ifdef CONFIG_FREEZER | |
610 | &pm_freeze_timeout_attr.attr, | |
611 | #endif | |
612 | NULL, | |
613 | }; | |
614 | ||
615 | static struct attribute_group attr_group = { | |
616 | .attrs = g, | |
617 | }; | |
618 | ||
619 | #ifdef CONFIG_PM_RUNTIME | |
620 | struct workqueue_struct *pm_wq; | |
621 | EXPORT_SYMBOL_GPL(pm_wq); | |
622 | ||
623 | static int __init pm_start_workqueue(void) | |
624 | { | |
625 | pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); | |
626 | ||
627 | return pm_wq ? 0 : -ENOMEM; | |
628 | } | |
629 | #else | |
630 | static inline int pm_start_workqueue(void) { return 0; } | |
631 | #endif | |
632 | ||
633 | static int __init pm_init(void) | |
634 | { | |
635 | int error = pm_start_workqueue(); | |
636 | if (error) | |
637 | return error; | |
638 | hibernate_image_size_init(); | |
639 | hibernate_reserved_size_init(); | |
640 | power_kobj = kobject_create_and_add("power", NULL); | |
641 | if (!power_kobj) | |
642 | return -ENOMEM; | |
643 | error = sysfs_create_group(power_kobj, &attr_group); | |
644 | if (error) | |
645 | return error; | |
646 | pm_print_times_init(); | |
647 | return pm_autosleep_init(); | |
648 | } | |
649 | ||
650 | core_initcall(pm_init); |