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Commit | Line | Data |
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1da177e4 LT |
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 | |
341d4166 | 6 | * |
1da177e4 LT |
7 | * This file is released under the GPLv2 |
8 | * | |
9 | */ | |
10 | ||
6e5fdeed | 11 | #include <linux/export.h> |
1da177e4 LT |
12 | #include <linux/kobject.h> |
13 | #include <linux/string.h> | |
431d452a | 14 | #include <linux/pm-trace.h> |
5e928f77 | 15 | #include <linux/workqueue.h> |
2a77c46d SL |
16 | #include <linux/debugfs.h> |
17 | #include <linux/seq_file.h> | |
1da177e4 LT |
18 | |
19 | #include "power.h" | |
20 | ||
a6d70980 | 21 | DEFINE_MUTEX(pm_mutex); |
1da177e4 | 22 | |
cd51e61c RW |
23 | #ifdef CONFIG_PM_SLEEP |
24 | ||
82525756 AS |
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 | ||
ea00f4f4 | 41 | int __pm_notifier_call_chain(unsigned long val, int nr_to_call, int *nr_calls) |
82525756 | 42 | { |
ea00f4f4 LW |
43 | int ret; |
44 | ||
45 | ret = __blocking_notifier_call_chain(&pm_chain_head, val, NULL, | |
46 | nr_to_call, nr_calls); | |
f0c077a8 AM |
47 | |
48 | return notifier_to_errno(ret); | |
82525756 | 49 | } |
ea00f4f4 LW |
50 | int pm_notifier_call_chain(unsigned long val) |
51 | { | |
52 | return __pm_notifier_call_chain(val, -1, NULL); | |
53 | } | |
82525756 | 54 | |
0e06b4a8 RW |
55 | /* If set, devices may be suspended and resumed asynchronously. */ |
56 | int pm_async_enabled = 1; | |
57 | ||
58 | static ssize_t pm_async_show(struct kobject *kobj, struct kobj_attribute *attr, | |
59 | char *buf) | |
60 | { | |
61 | return sprintf(buf, "%d\n", pm_async_enabled); | |
62 | } | |
63 | ||
64 | static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr, | |
65 | const char *buf, size_t n) | |
66 | { | |
67 | unsigned long val; | |
68 | ||
883ee4f7 | 69 | if (kstrtoul(buf, 10, &val)) |
0e06b4a8 RW |
70 | return -EINVAL; |
71 | ||
72 | if (val > 1) | |
73 | return -EINVAL; | |
74 | ||
75 | pm_async_enabled = val; | |
76 | return n; | |
77 | } | |
78 | ||
79 | power_attr(pm_async); | |
80 | ||
0e7d56e3 RW |
81 | #ifdef CONFIG_PM_DEBUG |
82 | int pm_test_level = TEST_NONE; | |
83 | ||
0e7d56e3 RW |
84 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
85 | [TEST_NONE] = "none", | |
86 | [TEST_CORE] = "core", | |
87 | [TEST_CPUS] = "processors", | |
88 | [TEST_PLATFORM] = "platform", | |
89 | [TEST_DEVICES] = "devices", | |
90 | [TEST_FREEZER] = "freezer", | |
91 | }; | |
92 | ||
039a75c6 RW |
93 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
94 | char *buf) | |
0e7d56e3 RW |
95 | { |
96 | char *s = buf; | |
97 | int level; | |
98 | ||
99 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
100 | if (pm_tests[level]) { | |
101 | if (level == pm_test_level) | |
102 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
103 | else | |
104 | s += sprintf(s, "%s ", pm_tests[level]); | |
105 | } | |
106 | ||
107 | if (s != buf) | |
108 | /* convert the last space to a newline */ | |
109 | *(s-1) = '\n'; | |
110 | ||
111 | return (s - buf); | |
112 | } | |
113 | ||
039a75c6 RW |
114 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
115 | const char *buf, size_t n) | |
0e7d56e3 RW |
116 | { |
117 | const char * const *s; | |
118 | int level; | |
119 | char *p; | |
120 | int len; | |
121 | int error = -EINVAL; | |
122 | ||
123 | p = memchr(buf, '\n', n); | |
124 | len = p ? p - buf : n; | |
125 | ||
bcda53fa | 126 | lock_system_sleep(); |
0e7d56e3 RW |
127 | |
128 | level = TEST_FIRST; | |
129 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
130 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
131 | pm_test_level = level; | |
132 | error = 0; | |
133 | break; | |
134 | } | |
135 | ||
bcda53fa | 136 | unlock_system_sleep(); |
0e7d56e3 RW |
137 | |
138 | return error ? error : n; | |
139 | } | |
140 | ||
141 | power_attr(pm_test); | |
091d71e0 | 142 | #endif /* CONFIG_PM_DEBUG */ |
0e7d56e3 | 143 | |
2a77c46d SL |
144 | #ifdef CONFIG_DEBUG_FS |
145 | static char *suspend_step_name(enum suspend_stat_step step) | |
146 | { | |
147 | switch (step) { | |
148 | case SUSPEND_FREEZE: | |
149 | return "freeze"; | |
150 | case SUSPEND_PREPARE: | |
151 | return "prepare"; | |
152 | case SUSPEND_SUSPEND: | |
153 | return "suspend"; | |
154 | case SUSPEND_SUSPEND_NOIRQ: | |
155 | return "suspend_noirq"; | |
156 | case SUSPEND_RESUME_NOIRQ: | |
157 | return "resume_noirq"; | |
158 | case SUSPEND_RESUME: | |
159 | return "resume"; | |
160 | default: | |
161 | return ""; | |
162 | } | |
163 | } | |
164 | ||
165 | static int suspend_stats_show(struct seq_file *s, void *unused) | |
166 | { | |
167 | int i, index, last_dev, last_errno, last_step; | |
168 | ||
169 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
170 | last_dev %= REC_FAILED_NUM; | |
171 | last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
172 | last_errno %= REC_FAILED_NUM; | |
173 | last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
174 | last_step %= REC_FAILED_NUM; | |
cf579dfb RW |
175 | seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" |
176 | "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", | |
2a77c46d SL |
177 | "success", suspend_stats.success, |
178 | "fail", suspend_stats.fail, | |
179 | "failed_freeze", suspend_stats.failed_freeze, | |
180 | "failed_prepare", suspend_stats.failed_prepare, | |
181 | "failed_suspend", suspend_stats.failed_suspend, | |
cf579dfb RW |
182 | "failed_suspend_late", |
183 | suspend_stats.failed_suspend_late, | |
2a77c46d SL |
184 | "failed_suspend_noirq", |
185 | suspend_stats.failed_suspend_noirq, | |
186 | "failed_resume", suspend_stats.failed_resume, | |
cf579dfb RW |
187 | "failed_resume_early", |
188 | suspend_stats.failed_resume_early, | |
2a77c46d SL |
189 | "failed_resume_noirq", |
190 | suspend_stats.failed_resume_noirq); | |
191 | seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", | |
192 | suspend_stats.failed_devs[last_dev]); | |
193 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
194 | index = last_dev + REC_FAILED_NUM - i; | |
195 | index %= REC_FAILED_NUM; | |
196 | seq_printf(s, "\t\t\t%-s\n", | |
197 | suspend_stats.failed_devs[index]); | |
198 | } | |
199 | seq_printf(s, " last_failed_errno:\t%-d\n", | |
200 | suspend_stats.errno[last_errno]); | |
201 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
202 | index = last_errno + REC_FAILED_NUM - i; | |
203 | index %= REC_FAILED_NUM; | |
204 | seq_printf(s, "\t\t\t%-d\n", | |
205 | suspend_stats.errno[index]); | |
206 | } | |
207 | seq_printf(s, " last_failed_step:\t%-s\n", | |
208 | suspend_step_name( | |
209 | suspend_stats.failed_steps[last_step])); | |
210 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
211 | index = last_step + REC_FAILED_NUM - i; | |
212 | index %= REC_FAILED_NUM; | |
213 | seq_printf(s, "\t\t\t%-s\n", | |
214 | suspend_step_name( | |
215 | suspend_stats.failed_steps[index])); | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static int suspend_stats_open(struct inode *inode, struct file *file) | |
222 | { | |
223 | return single_open(file, suspend_stats_show, NULL); | |
224 | } | |
225 | ||
226 | static const struct file_operations suspend_stats_operations = { | |
227 | .open = suspend_stats_open, | |
228 | .read = seq_read, | |
229 | .llseek = seq_lseek, | |
230 | .release = single_release, | |
231 | }; | |
232 | ||
233 | static int __init pm_debugfs_init(void) | |
234 | { | |
235 | debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, | |
236 | NULL, NULL, &suspend_stats_operations); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | late_initcall(pm_debugfs_init); | |
241 | #endif /* CONFIG_DEBUG_FS */ | |
242 | ||
ca123102 RW |
243 | #endif /* CONFIG_PM_SLEEP */ |
244 | ||
b2df1d4f RW |
245 | #ifdef CONFIG_PM_SLEEP_DEBUG |
246 | /* | |
247 | * pm_print_times: print time taken by devices to suspend and resume. | |
248 | * | |
249 | * show() returns whether printing of suspend and resume times is enabled. | |
250 | * store() accepts 0 or 1. 0 disables printing and 1 enables it. | |
251 | */ | |
252 | bool pm_print_times_enabled; | |
253 | ||
254 | static ssize_t pm_print_times_show(struct kobject *kobj, | |
255 | struct kobj_attribute *attr, char *buf) | |
256 | { | |
257 | return sprintf(buf, "%d\n", pm_print_times_enabled); | |
258 | } | |
259 | ||
260 | static ssize_t pm_print_times_store(struct kobject *kobj, | |
261 | struct kobj_attribute *attr, | |
262 | const char *buf, size_t n) | |
263 | { | |
264 | unsigned long val; | |
265 | ||
266 | if (kstrtoul(buf, 10, &val)) | |
267 | return -EINVAL; | |
268 | ||
269 | if (val > 1) | |
270 | return -EINVAL; | |
271 | ||
272 | pm_print_times_enabled = !!val; | |
273 | return n; | |
274 | } | |
275 | ||
276 | power_attr(pm_print_times); | |
277 | ||
278 | static inline void pm_print_times_init(void) | |
279 | { | |
280 | pm_print_times_enabled = !!initcall_debug; | |
281 | } | |
a6f5f0dd AY |
282 | |
283 | static ssize_t pm_wakeup_irq_show(struct kobject *kobj, | |
284 | struct kobj_attribute *attr, | |
285 | char *buf) | |
286 | { | |
287 | return pm_wakeup_irq ? sprintf(buf, "%u\n", pm_wakeup_irq) : -ENODATA; | |
288 | } | |
289 | ||
a1e9ca69 | 290 | power_attr_ro(pm_wakeup_irq); |
a6f5f0dd | 291 | |
819b1bb3 | 292 | #else /* !CONFIG_PM_SLEEP_DEBUG */ |
b2df1d4f RW |
293 | static inline void pm_print_times_init(void) {} |
294 | #endif /* CONFIG_PM_SLEEP_DEBUG */ | |
295 | ||
d76e15fb | 296 | struct kobject *power_kobj; |
1da177e4 LT |
297 | |
298 | /** | |
0399d4db | 299 | * state - control system sleep states. |
1da177e4 | 300 | * |
0399d4db RW |
301 | * show() returns available sleep state labels, which may be "mem", "standby", |
302 | * "freeze" and "disk" (hibernation). See Documentation/power/states.txt for a | |
303 | * description of what they mean. | |
1da177e4 | 304 | * |
0399d4db RW |
305 | * store() accepts one of those strings, translates it into the proper |
306 | * enumerated value, and initiates a suspend transition. | |
1da177e4 | 307 | */ |
386f275f KS |
308 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
309 | char *buf) | |
1da177e4 | 310 | { |
296699de RW |
311 | char *s = buf; |
312 | #ifdef CONFIG_SUSPEND | |
27ddcc65 RW |
313 | suspend_state_t i; |
314 | ||
315 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) | |
d431cbc5 RW |
316 | if (pm_states[i]) |
317 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 318 | |
296699de | 319 | #endif |
a6e15a39 KC |
320 | if (hibernation_available()) |
321 | s += sprintf(s, "disk "); | |
a3d25c27 RW |
322 | if (s != buf) |
323 | /* convert the last space to a newline */ | |
324 | *(s-1) = '\n'; | |
1da177e4 LT |
325 | return (s - buf); |
326 | } | |
327 | ||
7483b4a4 | 328 | static suspend_state_t decode_state(const char *buf, size_t n) |
1da177e4 | 329 | { |
296699de | 330 | #ifdef CONFIG_SUSPEND |
d431cbc5 | 331 | suspend_state_t state; |
296699de | 332 | #endif |
1da177e4 | 333 | char *p; |
1da177e4 LT |
334 | int len; |
335 | ||
336 | p = memchr(buf, '\n', n); | |
337 | len = p ? p - buf : n; | |
338 | ||
7483b4a4 RW |
339 | /* Check hibernation first. */ |
340 | if (len == 4 && !strncmp(buf, "disk", len)) | |
341 | return PM_SUSPEND_MAX; | |
a3d25c27 | 342 | |
296699de | 343 | #ifdef CONFIG_SUSPEND |
d431cbc5 RW |
344 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { |
345 | const char *label = pm_states[state]; | |
346 | ||
347 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
348 | return state; | |
349 | } | |
296699de RW |
350 | #endif |
351 | ||
7483b4a4 RW |
352 | return PM_SUSPEND_ON; |
353 | } | |
354 | ||
355 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, | |
356 | const char *buf, size_t n) | |
357 | { | |
358 | suspend_state_t state; | |
359 | int error; | |
360 | ||
361 | error = pm_autosleep_lock(); | |
362 | if (error) | |
363 | return error; | |
364 | ||
365 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
366 | error = -EBUSY; | |
367 | goto out; | |
368 | } | |
369 | ||
370 | state = decode_state(buf, n); | |
371 | if (state < PM_SUSPEND_MAX) | |
372 | error = pm_suspend(state); | |
373 | else if (state == PM_SUSPEND_MAX) | |
374 | error = hibernate(); | |
375 | else | |
376 | error = -EINVAL; | |
377 | ||
378 | out: | |
379 | pm_autosleep_unlock(); | |
1da177e4 LT |
380 | return error ? error : n; |
381 | } | |
382 | ||
383 | power_attr(state); | |
384 | ||
c125e96f RW |
385 | #ifdef CONFIG_PM_SLEEP |
386 | /* | |
387 | * The 'wakeup_count' attribute, along with the functions defined in | |
388 | * drivers/base/power/wakeup.c, provides a means by which wakeup events can be | |
389 | * handled in a non-racy way. | |
390 | * | |
391 | * If a wakeup event occurs when the system is in a sleep state, it simply is | |
392 | * woken up. In turn, if an event that would wake the system up from a sleep | |
393 | * state occurs when it is undergoing a transition to that sleep state, the | |
394 | * transition should be aborted. Moreover, if such an event occurs when the | |
395 | * system is in the working state, an attempt to start a transition to the | |
396 | * given sleep state should fail during certain period after the detection of | |
397 | * the event. Using the 'state' attribute alone is not sufficient to satisfy | |
398 | * these requirements, because a wakeup event may occur exactly when 'state' | |
399 | * is being written to and may be delivered to user space right before it is | |
400 | * frozen, so the event will remain only partially processed until the system is | |
401 | * woken up by another event. In particular, it won't cause the transition to | |
402 | * a sleep state to be aborted. | |
403 | * | |
404 | * This difficulty may be overcome if user space uses 'wakeup_count' before | |
405 | * writing to 'state'. It first should read from 'wakeup_count' and store | |
406 | * the read value. Then, after carrying out its own preparations for the system | |
407 | * transition to a sleep state, it should write the stored value to | |
25985edc | 408 | * 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
c125e96f RW |
409 | * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it |
410 | * is allowed to write to 'state', but the transition will be aborted if there | |
411 | * are any wakeup events detected after 'wakeup_count' was written to. | |
412 | */ | |
413 | ||
414 | static ssize_t wakeup_count_show(struct kobject *kobj, | |
415 | struct kobj_attribute *attr, | |
416 | char *buf) | |
417 | { | |
074037ec | 418 | unsigned int val; |
c125e96f | 419 | |
7483b4a4 RW |
420 | return pm_get_wakeup_count(&val, true) ? |
421 | sprintf(buf, "%u\n", val) : -EINTR; | |
c125e96f RW |
422 | } |
423 | ||
424 | static ssize_t wakeup_count_store(struct kobject *kobj, | |
425 | struct kobj_attribute *attr, | |
426 | const char *buf, size_t n) | |
427 | { | |
074037ec | 428 | unsigned int val; |
7483b4a4 RW |
429 | int error; |
430 | ||
431 | error = pm_autosleep_lock(); | |
432 | if (error) | |
433 | return error; | |
c125e96f | 434 | |
7483b4a4 RW |
435 | if (pm_autosleep_state() > PM_SUSPEND_ON) { |
436 | error = -EBUSY; | |
437 | goto out; | |
438 | } | |
439 | ||
440 | error = -EINVAL; | |
074037ec | 441 | if (sscanf(buf, "%u", &val) == 1) { |
c125e96f | 442 | if (pm_save_wakeup_count(val)) |
7483b4a4 | 443 | error = n; |
bb177fed JW |
444 | else |
445 | pm_print_active_wakeup_sources(); | |
c125e96f | 446 | } |
7483b4a4 RW |
447 | |
448 | out: | |
449 | pm_autosleep_unlock(); | |
450 | return error; | |
c125e96f RW |
451 | } |
452 | ||
453 | power_attr(wakeup_count); | |
7483b4a4 RW |
454 | |
455 | #ifdef CONFIG_PM_AUTOSLEEP | |
456 | static ssize_t autosleep_show(struct kobject *kobj, | |
457 | struct kobj_attribute *attr, | |
458 | char *buf) | |
459 | { | |
460 | suspend_state_t state = pm_autosleep_state(); | |
461 | ||
462 | if (state == PM_SUSPEND_ON) | |
463 | return sprintf(buf, "off\n"); | |
464 | ||
465 | #ifdef CONFIG_SUSPEND | |
466 | if (state < PM_SUSPEND_MAX) | |
d431cbc5 RW |
467 | return sprintf(buf, "%s\n", pm_states[state] ? |
468 | pm_states[state] : "error"); | |
7483b4a4 RW |
469 | #endif |
470 | #ifdef CONFIG_HIBERNATION | |
471 | return sprintf(buf, "disk\n"); | |
472 | #else | |
473 | return sprintf(buf, "error"); | |
474 | #endif | |
475 | } | |
476 | ||
477 | static ssize_t autosleep_store(struct kobject *kobj, | |
478 | struct kobj_attribute *attr, | |
479 | const char *buf, size_t n) | |
480 | { | |
481 | suspend_state_t state = decode_state(buf, n); | |
482 | int error; | |
483 | ||
484 | if (state == PM_SUSPEND_ON | |
040e5bf6 | 485 | && strcmp(buf, "off") && strcmp(buf, "off\n")) |
7483b4a4 RW |
486 | return -EINVAL; |
487 | ||
488 | error = pm_autosleep_set_state(state); | |
489 | return error ? error : n; | |
490 | } | |
491 | ||
492 | power_attr(autosleep); | |
493 | #endif /* CONFIG_PM_AUTOSLEEP */ | |
b86ff982 RW |
494 | |
495 | #ifdef CONFIG_PM_WAKELOCKS | |
496 | static ssize_t wake_lock_show(struct kobject *kobj, | |
497 | struct kobj_attribute *attr, | |
498 | char *buf) | |
499 | { | |
500 | return pm_show_wakelocks(buf, true); | |
501 | } | |
502 | ||
503 | static ssize_t wake_lock_store(struct kobject *kobj, | |
504 | struct kobj_attribute *attr, | |
505 | const char *buf, size_t n) | |
506 | { | |
507 | int error = pm_wake_lock(buf); | |
508 | return error ? error : n; | |
509 | } | |
510 | ||
511 | power_attr(wake_lock); | |
512 | ||
513 | static ssize_t wake_unlock_show(struct kobject *kobj, | |
514 | struct kobj_attribute *attr, | |
515 | char *buf) | |
516 | { | |
517 | return pm_show_wakelocks(buf, false); | |
518 | } | |
519 | ||
520 | static ssize_t wake_unlock_store(struct kobject *kobj, | |
521 | struct kobj_attribute *attr, | |
522 | const char *buf, size_t n) | |
523 | { | |
524 | int error = pm_wake_unlock(buf); | |
525 | return error ? error : n; | |
526 | } | |
527 | ||
528 | power_attr(wake_unlock); | |
529 | ||
530 | #endif /* CONFIG_PM_WAKELOCKS */ | |
c125e96f RW |
531 | #endif /* CONFIG_PM_SLEEP */ |
532 | ||
c5c6ba4e RW |
533 | #ifdef CONFIG_PM_TRACE |
534 | int pm_trace_enabled; | |
535 | ||
386f275f KS |
536 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
537 | char *buf) | |
c5c6ba4e RW |
538 | { |
539 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
540 | } | |
541 | ||
542 | static ssize_t | |
386f275f KS |
543 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
544 | const char *buf, size_t n) | |
c5c6ba4e RW |
545 | { |
546 | int val; | |
547 | ||
548 | if (sscanf(buf, "%d", &val) == 1) { | |
549 | pm_trace_enabled = !!val; | |
9dceefe4 SK |
550 | if (pm_trace_enabled) { |
551 | pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" | |
552 | "PM: Correct system time has to be restored manually after resume.\n"); | |
553 | } | |
c5c6ba4e RW |
554 | return n; |
555 | } | |
556 | return -EINVAL; | |
557 | } | |
558 | ||
559 | power_attr(pm_trace); | |
d33ac60b JH |
560 | |
561 | static ssize_t pm_trace_dev_match_show(struct kobject *kobj, | |
562 | struct kobj_attribute *attr, | |
563 | char *buf) | |
564 | { | |
565 | return show_trace_dev_match(buf, PAGE_SIZE); | |
566 | } | |
567 | ||
a1e9ca69 | 568 | power_attr_ro(pm_trace_dev_match); |
d33ac60b | 569 | |
0e7d56e3 | 570 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e | 571 | |
957d1282 LF |
572 | #ifdef CONFIG_FREEZER |
573 | static ssize_t pm_freeze_timeout_show(struct kobject *kobj, | |
574 | struct kobj_attribute *attr, char *buf) | |
575 | { | |
576 | return sprintf(buf, "%u\n", freeze_timeout_msecs); | |
577 | } | |
578 | ||
579 | static ssize_t pm_freeze_timeout_store(struct kobject *kobj, | |
580 | struct kobj_attribute *attr, | |
581 | const char *buf, size_t n) | |
582 | { | |
583 | unsigned long val; | |
584 | ||
585 | if (kstrtoul(buf, 10, &val)) | |
586 | return -EINVAL; | |
587 | ||
588 | freeze_timeout_msecs = val; | |
589 | return n; | |
590 | } | |
591 | ||
592 | power_attr(pm_freeze_timeout); | |
593 | ||
594 | #endif /* CONFIG_FREEZER*/ | |
595 | ||
c5c6ba4e RW |
596 | static struct attribute * g[] = { |
597 | &state_attr.attr, | |
0e7d56e3 | 598 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 599 | &pm_trace_attr.attr, |
d33ac60b | 600 | &pm_trace_dev_match_attr.attr, |
0e7d56e3 | 601 | #endif |
0e06b4a8 RW |
602 | #ifdef CONFIG_PM_SLEEP |
603 | &pm_async_attr.attr, | |
c125e96f | 604 | &wakeup_count_attr.attr, |
7483b4a4 RW |
605 | #ifdef CONFIG_PM_AUTOSLEEP |
606 | &autosleep_attr.attr, | |
607 | #endif | |
b86ff982 RW |
608 | #ifdef CONFIG_PM_WAKELOCKS |
609 | &wake_lock_attr.attr, | |
610 | &wake_unlock_attr.attr, | |
611 | #endif | |
0e06b4a8 | 612 | #ifdef CONFIG_PM_DEBUG |
0e7d56e3 | 613 | &pm_test_attr.attr, |
b2df1d4f RW |
614 | #endif |
615 | #ifdef CONFIG_PM_SLEEP_DEBUG | |
4b7760ba | 616 | &pm_print_times_attr.attr, |
a6f5f0dd | 617 | &pm_wakeup_irq_attr.attr, |
0e06b4a8 | 618 | #endif |
957d1282 LF |
619 | #endif |
620 | #ifdef CONFIG_FREEZER | |
621 | &pm_freeze_timeout_attr.attr, | |
0e7d56e3 | 622 | #endif |
c5c6ba4e RW |
623 | NULL, |
624 | }; | |
1da177e4 LT |
625 | |
626 | static struct attribute_group attr_group = { | |
627 | .attrs = g, | |
628 | }; | |
629 | ||
5e928f77 | 630 | struct workqueue_struct *pm_wq; |
7b199ca2 | 631 | EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77 RW |
632 | |
633 | static int __init pm_start_workqueue(void) | |
634 | { | |
58a69cb4 | 635 | pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77 RW |
636 | |
637 | return pm_wq ? 0 : -ENOMEM; | |
638 | } | |
5e928f77 | 639 | |
1da177e4 LT |
640 | static int __init pm_init(void) |
641 | { | |
5e928f77 RW |
642 | int error = pm_start_workqueue(); |
643 | if (error) | |
644 | return error; | |
ac5c24ec | 645 | hibernate_image_size_init(); |
ddeb6487 | 646 | hibernate_reserved_size_init(); |
fa7fd6fa | 647 | pm_states_init(); |
d76e15fb GKH |
648 | power_kobj = kobject_create_and_add("power", NULL); |
649 | if (!power_kobj) | |
039a5dcd | 650 | return -ENOMEM; |
7483b4a4 RW |
651 | error = sysfs_create_group(power_kobj, &attr_group); |
652 | if (error) | |
653 | return error; | |
b2df1d4f | 654 | pm_print_times_init(); |
7483b4a4 | 655 | return pm_autosleep_init(); |
1da177e4 LT |
656 | } |
657 | ||
658 | core_initcall(pm_init); |