Commit | Line | Data |
---|---|---|
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 | ||
406e7938 RW |
81 | #ifdef CONFIG_SUSPEND |
82 | static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr, | |
83 | char *buf) | |
84 | { | |
85 | char *s = buf; | |
86 | suspend_state_t i; | |
87 | ||
88 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) | |
89 | if (mem_sleep_states[i]) { | |
90 | const char *label = mem_sleep_states[i]; | |
91 | ||
92 | if (mem_sleep_current == i) | |
93 | s += sprintf(s, "[%s] ", label); | |
94 | else | |
95 | s += sprintf(s, "%s ", label); | |
96 | } | |
97 | ||
98 | /* Convert the last space to a newline if needed. */ | |
99 | if (s != buf) | |
100 | *(s-1) = '\n'; | |
101 | ||
102 | return (s - buf); | |
103 | } | |
104 | ||
105 | static suspend_state_t decode_suspend_state(const char *buf, size_t n) | |
106 | { | |
107 | suspend_state_t state; | |
108 | char *p; | |
109 | int len; | |
110 | ||
111 | p = memchr(buf, '\n', n); | |
112 | len = p ? p - buf : n; | |
113 | ||
114 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { | |
115 | const char *label = mem_sleep_states[state]; | |
116 | ||
117 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
118 | return state; | |
119 | } | |
120 | ||
121 | return PM_SUSPEND_ON; | |
122 | } | |
123 | ||
124 | static ssize_t mem_sleep_store(struct kobject *kobj, struct kobj_attribute *attr, | |
125 | const char *buf, size_t n) | |
126 | { | |
127 | suspend_state_t state; | |
128 | int error; | |
129 | ||
130 | error = pm_autosleep_lock(); | |
131 | if (error) | |
132 | return error; | |
133 | ||
134 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
135 | error = -EBUSY; | |
136 | goto out; | |
137 | } | |
138 | ||
139 | state = decode_suspend_state(buf, n); | |
140 | if (state < PM_SUSPEND_MAX && state > PM_SUSPEND_ON) | |
141 | mem_sleep_current = state; | |
142 | else | |
143 | error = -EINVAL; | |
144 | ||
145 | out: | |
146 | pm_autosleep_unlock(); | |
147 | return error ? error : n; | |
148 | } | |
149 | ||
150 | power_attr(mem_sleep); | |
151 | #endif /* CONFIG_SUSPEND */ | |
152 | ||
0e7d56e3 RW |
153 | #ifdef CONFIG_PM_DEBUG |
154 | int pm_test_level = TEST_NONE; | |
155 | ||
0e7d56e3 RW |
156 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
157 | [TEST_NONE] = "none", | |
158 | [TEST_CORE] = "core", | |
159 | [TEST_CPUS] = "processors", | |
160 | [TEST_PLATFORM] = "platform", | |
161 | [TEST_DEVICES] = "devices", | |
162 | [TEST_FREEZER] = "freezer", | |
163 | }; | |
164 | ||
039a75c6 RW |
165 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
166 | char *buf) | |
0e7d56e3 RW |
167 | { |
168 | char *s = buf; | |
169 | int level; | |
170 | ||
171 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
172 | if (pm_tests[level]) { | |
173 | if (level == pm_test_level) | |
174 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
175 | else | |
176 | s += sprintf(s, "%s ", pm_tests[level]); | |
177 | } | |
178 | ||
179 | if (s != buf) | |
180 | /* convert the last space to a newline */ | |
181 | *(s-1) = '\n'; | |
182 | ||
183 | return (s - buf); | |
184 | } | |
185 | ||
039a75c6 RW |
186 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
187 | const char *buf, size_t n) | |
0e7d56e3 RW |
188 | { |
189 | const char * const *s; | |
190 | int level; | |
191 | char *p; | |
192 | int len; | |
193 | int error = -EINVAL; | |
194 | ||
195 | p = memchr(buf, '\n', n); | |
196 | len = p ? p - buf : n; | |
197 | ||
bcda53fa | 198 | lock_system_sleep(); |
0e7d56e3 RW |
199 | |
200 | level = TEST_FIRST; | |
201 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
202 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
203 | pm_test_level = level; | |
204 | error = 0; | |
205 | break; | |
206 | } | |
207 | ||
bcda53fa | 208 | unlock_system_sleep(); |
0e7d56e3 RW |
209 | |
210 | return error ? error : n; | |
211 | } | |
212 | ||
213 | power_attr(pm_test); | |
091d71e0 | 214 | #endif /* CONFIG_PM_DEBUG */ |
0e7d56e3 | 215 | |
2a77c46d SL |
216 | #ifdef CONFIG_DEBUG_FS |
217 | static char *suspend_step_name(enum suspend_stat_step step) | |
218 | { | |
219 | switch (step) { | |
220 | case SUSPEND_FREEZE: | |
221 | return "freeze"; | |
222 | case SUSPEND_PREPARE: | |
223 | return "prepare"; | |
224 | case SUSPEND_SUSPEND: | |
225 | return "suspend"; | |
226 | case SUSPEND_SUSPEND_NOIRQ: | |
227 | return "suspend_noirq"; | |
228 | case SUSPEND_RESUME_NOIRQ: | |
229 | return "resume_noirq"; | |
230 | case SUSPEND_RESUME: | |
231 | return "resume"; | |
232 | default: | |
233 | return ""; | |
234 | } | |
235 | } | |
236 | ||
237 | static int suspend_stats_show(struct seq_file *s, void *unused) | |
238 | { | |
239 | int i, index, last_dev, last_errno, last_step; | |
240 | ||
241 | last_dev = suspend_stats.last_failed_dev + REC_FAILED_NUM - 1; | |
242 | last_dev %= REC_FAILED_NUM; | |
243 | last_errno = suspend_stats.last_failed_errno + REC_FAILED_NUM - 1; | |
244 | last_errno %= REC_FAILED_NUM; | |
245 | last_step = suspend_stats.last_failed_step + REC_FAILED_NUM - 1; | |
246 | last_step %= REC_FAILED_NUM; | |
cf579dfb RW |
247 | seq_printf(s, "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n" |
248 | "%s: %d\n%s: %d\n%s: %d\n%s: %d\n%s: %d\n", | |
2a77c46d SL |
249 | "success", suspend_stats.success, |
250 | "fail", suspend_stats.fail, | |
251 | "failed_freeze", suspend_stats.failed_freeze, | |
252 | "failed_prepare", suspend_stats.failed_prepare, | |
253 | "failed_suspend", suspend_stats.failed_suspend, | |
cf579dfb RW |
254 | "failed_suspend_late", |
255 | suspend_stats.failed_suspend_late, | |
2a77c46d SL |
256 | "failed_suspend_noirq", |
257 | suspend_stats.failed_suspend_noirq, | |
258 | "failed_resume", suspend_stats.failed_resume, | |
cf579dfb RW |
259 | "failed_resume_early", |
260 | suspend_stats.failed_resume_early, | |
2a77c46d SL |
261 | "failed_resume_noirq", |
262 | suspend_stats.failed_resume_noirq); | |
263 | seq_printf(s, "failures:\n last_failed_dev:\t%-s\n", | |
264 | suspend_stats.failed_devs[last_dev]); | |
265 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
266 | index = last_dev + REC_FAILED_NUM - i; | |
267 | index %= REC_FAILED_NUM; | |
268 | seq_printf(s, "\t\t\t%-s\n", | |
269 | suspend_stats.failed_devs[index]); | |
270 | } | |
271 | seq_printf(s, " last_failed_errno:\t%-d\n", | |
272 | suspend_stats.errno[last_errno]); | |
273 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
274 | index = last_errno + REC_FAILED_NUM - i; | |
275 | index %= REC_FAILED_NUM; | |
276 | seq_printf(s, "\t\t\t%-d\n", | |
277 | suspend_stats.errno[index]); | |
278 | } | |
279 | seq_printf(s, " last_failed_step:\t%-s\n", | |
280 | suspend_step_name( | |
281 | suspend_stats.failed_steps[last_step])); | |
282 | for (i = 1; i < REC_FAILED_NUM; i++) { | |
283 | index = last_step + REC_FAILED_NUM - i; | |
284 | index %= REC_FAILED_NUM; | |
285 | seq_printf(s, "\t\t\t%-s\n", | |
286 | suspend_step_name( | |
287 | suspend_stats.failed_steps[index])); | |
288 | } | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static int suspend_stats_open(struct inode *inode, struct file *file) | |
294 | { | |
295 | return single_open(file, suspend_stats_show, NULL); | |
296 | } | |
297 | ||
298 | static const struct file_operations suspend_stats_operations = { | |
299 | .open = suspend_stats_open, | |
300 | .read = seq_read, | |
301 | .llseek = seq_lseek, | |
302 | .release = single_release, | |
303 | }; | |
304 | ||
305 | static int __init pm_debugfs_init(void) | |
306 | { | |
307 | debugfs_create_file("suspend_stats", S_IFREG | S_IRUGO, | |
308 | NULL, NULL, &suspend_stats_operations); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | late_initcall(pm_debugfs_init); | |
313 | #endif /* CONFIG_DEBUG_FS */ | |
314 | ||
ca123102 RW |
315 | #endif /* CONFIG_PM_SLEEP */ |
316 | ||
b2df1d4f RW |
317 | #ifdef CONFIG_PM_SLEEP_DEBUG |
318 | /* | |
319 | * pm_print_times: print time taken by devices to suspend and resume. | |
320 | * | |
321 | * show() returns whether printing of suspend and resume times is enabled. | |
322 | * store() accepts 0 or 1. 0 disables printing and 1 enables it. | |
323 | */ | |
324 | bool pm_print_times_enabled; | |
325 | ||
326 | static ssize_t pm_print_times_show(struct kobject *kobj, | |
327 | struct kobj_attribute *attr, char *buf) | |
328 | { | |
329 | return sprintf(buf, "%d\n", pm_print_times_enabled); | |
330 | } | |
331 | ||
332 | static ssize_t pm_print_times_store(struct kobject *kobj, | |
333 | struct kobj_attribute *attr, | |
334 | const char *buf, size_t n) | |
335 | { | |
336 | unsigned long val; | |
337 | ||
338 | if (kstrtoul(buf, 10, &val)) | |
339 | return -EINVAL; | |
340 | ||
341 | if (val > 1) | |
342 | return -EINVAL; | |
343 | ||
344 | pm_print_times_enabled = !!val; | |
345 | return n; | |
346 | } | |
347 | ||
348 | power_attr(pm_print_times); | |
349 | ||
350 | static inline void pm_print_times_init(void) | |
351 | { | |
352 | pm_print_times_enabled = !!initcall_debug; | |
353 | } | |
a6f5f0dd AY |
354 | |
355 | static ssize_t pm_wakeup_irq_show(struct kobject *kobj, | |
356 | struct kobj_attribute *attr, | |
357 | char *buf) | |
358 | { | |
359 | return pm_wakeup_irq ? sprintf(buf, "%u\n", pm_wakeup_irq) : -ENODATA; | |
360 | } | |
361 | ||
a1e9ca69 | 362 | power_attr_ro(pm_wakeup_irq); |
a6f5f0dd | 363 | |
819b1bb3 | 364 | #else /* !CONFIG_PM_SLEEP_DEBUG */ |
b2df1d4f RW |
365 | static inline void pm_print_times_init(void) {} |
366 | #endif /* CONFIG_PM_SLEEP_DEBUG */ | |
367 | ||
d76e15fb | 368 | struct kobject *power_kobj; |
1da177e4 LT |
369 | |
370 | /** | |
0399d4db | 371 | * state - control system sleep states. |
1da177e4 | 372 | * |
0399d4db RW |
373 | * show() returns available sleep state labels, which may be "mem", "standby", |
374 | * "freeze" and "disk" (hibernation). See Documentation/power/states.txt for a | |
375 | * description of what they mean. | |
1da177e4 | 376 | * |
0399d4db RW |
377 | * store() accepts one of those strings, translates it into the proper |
378 | * enumerated value, and initiates a suspend transition. | |
1da177e4 | 379 | */ |
386f275f KS |
380 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
381 | char *buf) | |
1da177e4 | 382 | { |
296699de RW |
383 | char *s = buf; |
384 | #ifdef CONFIG_SUSPEND | |
27ddcc65 RW |
385 | suspend_state_t i; |
386 | ||
387 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) | |
d431cbc5 RW |
388 | if (pm_states[i]) |
389 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 390 | |
296699de | 391 | #endif |
a6e15a39 KC |
392 | if (hibernation_available()) |
393 | s += sprintf(s, "disk "); | |
a3d25c27 RW |
394 | if (s != buf) |
395 | /* convert the last space to a newline */ | |
396 | *(s-1) = '\n'; | |
1da177e4 LT |
397 | return (s - buf); |
398 | } | |
399 | ||
7483b4a4 | 400 | static suspend_state_t decode_state(const char *buf, size_t n) |
1da177e4 | 401 | { |
296699de | 402 | #ifdef CONFIG_SUSPEND |
d431cbc5 | 403 | suspend_state_t state; |
296699de | 404 | #endif |
1da177e4 | 405 | char *p; |
1da177e4 LT |
406 | int len; |
407 | ||
408 | p = memchr(buf, '\n', n); | |
409 | len = p ? p - buf : n; | |
410 | ||
7483b4a4 RW |
411 | /* Check hibernation first. */ |
412 | if (len == 4 && !strncmp(buf, "disk", len)) | |
413 | return PM_SUSPEND_MAX; | |
a3d25c27 | 414 | |
296699de | 415 | #ifdef CONFIG_SUSPEND |
d431cbc5 RW |
416 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { |
417 | const char *label = pm_states[state]; | |
418 | ||
419 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
420 | return state; | |
421 | } | |
296699de RW |
422 | #endif |
423 | ||
7483b4a4 RW |
424 | return PM_SUSPEND_ON; |
425 | } | |
426 | ||
427 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, | |
428 | const char *buf, size_t n) | |
429 | { | |
430 | suspend_state_t state; | |
431 | int error; | |
432 | ||
433 | error = pm_autosleep_lock(); | |
434 | if (error) | |
435 | return error; | |
436 | ||
437 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
438 | error = -EBUSY; | |
439 | goto out; | |
440 | } | |
441 | ||
442 | state = decode_state(buf, n); | |
406e7938 RW |
443 | if (state < PM_SUSPEND_MAX) { |
444 | if (state == PM_SUSPEND_MEM) | |
445 | state = mem_sleep_current; | |
446 | ||
7483b4a4 | 447 | error = pm_suspend(state); |
406e7938 | 448 | } else if (state == PM_SUSPEND_MAX) { |
7483b4a4 | 449 | error = hibernate(); |
406e7938 | 450 | } else { |
7483b4a4 | 451 | error = -EINVAL; |
406e7938 | 452 | } |
7483b4a4 RW |
453 | |
454 | out: | |
455 | pm_autosleep_unlock(); | |
1da177e4 LT |
456 | return error ? error : n; |
457 | } | |
458 | ||
459 | power_attr(state); | |
460 | ||
c125e96f RW |
461 | #ifdef CONFIG_PM_SLEEP |
462 | /* | |
463 | * The 'wakeup_count' attribute, along with the functions defined in | |
464 | * drivers/base/power/wakeup.c, provides a means by which wakeup events can be | |
465 | * handled in a non-racy way. | |
466 | * | |
467 | * If a wakeup event occurs when the system is in a sleep state, it simply is | |
468 | * woken up. In turn, if an event that would wake the system up from a sleep | |
469 | * state occurs when it is undergoing a transition to that sleep state, the | |
470 | * transition should be aborted. Moreover, if such an event occurs when the | |
471 | * system is in the working state, an attempt to start a transition to the | |
472 | * given sleep state should fail during certain period after the detection of | |
473 | * the event. Using the 'state' attribute alone is not sufficient to satisfy | |
474 | * these requirements, because a wakeup event may occur exactly when 'state' | |
475 | * is being written to and may be delivered to user space right before it is | |
476 | * frozen, so the event will remain only partially processed until the system is | |
477 | * woken up by another event. In particular, it won't cause the transition to | |
478 | * a sleep state to be aborted. | |
479 | * | |
480 | * This difficulty may be overcome if user space uses 'wakeup_count' before | |
481 | * writing to 'state'. It first should read from 'wakeup_count' and store | |
482 | * the read value. Then, after carrying out its own preparations for the system | |
483 | * transition to a sleep state, it should write the stored value to | |
25985edc | 484 | * 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
c125e96f RW |
485 | * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it |
486 | * is allowed to write to 'state', but the transition will be aborted if there | |
487 | * are any wakeup events detected after 'wakeup_count' was written to. | |
488 | */ | |
489 | ||
490 | static ssize_t wakeup_count_show(struct kobject *kobj, | |
491 | struct kobj_attribute *attr, | |
492 | char *buf) | |
493 | { | |
074037ec | 494 | unsigned int val; |
c125e96f | 495 | |
7483b4a4 RW |
496 | return pm_get_wakeup_count(&val, true) ? |
497 | sprintf(buf, "%u\n", val) : -EINTR; | |
c125e96f RW |
498 | } |
499 | ||
500 | static ssize_t wakeup_count_store(struct kobject *kobj, | |
501 | struct kobj_attribute *attr, | |
502 | const char *buf, size_t n) | |
503 | { | |
074037ec | 504 | unsigned int val; |
7483b4a4 RW |
505 | int error; |
506 | ||
507 | error = pm_autosleep_lock(); | |
508 | if (error) | |
509 | return error; | |
c125e96f | 510 | |
7483b4a4 RW |
511 | if (pm_autosleep_state() > PM_SUSPEND_ON) { |
512 | error = -EBUSY; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | error = -EINVAL; | |
074037ec | 517 | if (sscanf(buf, "%u", &val) == 1) { |
c125e96f | 518 | if (pm_save_wakeup_count(val)) |
7483b4a4 | 519 | error = n; |
bb177fed JW |
520 | else |
521 | pm_print_active_wakeup_sources(); | |
c125e96f | 522 | } |
7483b4a4 RW |
523 | |
524 | out: | |
525 | pm_autosleep_unlock(); | |
526 | return error; | |
c125e96f RW |
527 | } |
528 | ||
529 | power_attr(wakeup_count); | |
7483b4a4 RW |
530 | |
531 | #ifdef CONFIG_PM_AUTOSLEEP | |
532 | static ssize_t autosleep_show(struct kobject *kobj, | |
533 | struct kobj_attribute *attr, | |
534 | char *buf) | |
535 | { | |
536 | suspend_state_t state = pm_autosleep_state(); | |
537 | ||
538 | if (state == PM_SUSPEND_ON) | |
539 | return sprintf(buf, "off\n"); | |
540 | ||
541 | #ifdef CONFIG_SUSPEND | |
542 | if (state < PM_SUSPEND_MAX) | |
d431cbc5 RW |
543 | return sprintf(buf, "%s\n", pm_states[state] ? |
544 | pm_states[state] : "error"); | |
7483b4a4 RW |
545 | #endif |
546 | #ifdef CONFIG_HIBERNATION | |
547 | return sprintf(buf, "disk\n"); | |
548 | #else | |
549 | return sprintf(buf, "error"); | |
550 | #endif | |
551 | } | |
552 | ||
553 | static ssize_t autosleep_store(struct kobject *kobj, | |
554 | struct kobj_attribute *attr, | |
555 | const char *buf, size_t n) | |
556 | { | |
557 | suspend_state_t state = decode_state(buf, n); | |
558 | int error; | |
559 | ||
560 | if (state == PM_SUSPEND_ON | |
040e5bf6 | 561 | && strcmp(buf, "off") && strcmp(buf, "off\n")) |
7483b4a4 RW |
562 | return -EINVAL; |
563 | ||
406e7938 RW |
564 | if (state == PM_SUSPEND_MEM) |
565 | state = mem_sleep_current; | |
566 | ||
7483b4a4 RW |
567 | error = pm_autosleep_set_state(state); |
568 | return error ? error : n; | |
569 | } | |
570 | ||
571 | power_attr(autosleep); | |
572 | #endif /* CONFIG_PM_AUTOSLEEP */ | |
b86ff982 RW |
573 | |
574 | #ifdef CONFIG_PM_WAKELOCKS | |
575 | static ssize_t wake_lock_show(struct kobject *kobj, | |
576 | struct kobj_attribute *attr, | |
577 | char *buf) | |
578 | { | |
579 | return pm_show_wakelocks(buf, true); | |
580 | } | |
581 | ||
582 | static ssize_t wake_lock_store(struct kobject *kobj, | |
583 | struct kobj_attribute *attr, | |
584 | const char *buf, size_t n) | |
585 | { | |
586 | int error = pm_wake_lock(buf); | |
587 | return error ? error : n; | |
588 | } | |
589 | ||
590 | power_attr(wake_lock); | |
591 | ||
592 | static ssize_t wake_unlock_show(struct kobject *kobj, | |
593 | struct kobj_attribute *attr, | |
594 | char *buf) | |
595 | { | |
596 | return pm_show_wakelocks(buf, false); | |
597 | } | |
598 | ||
599 | static ssize_t wake_unlock_store(struct kobject *kobj, | |
600 | struct kobj_attribute *attr, | |
601 | const char *buf, size_t n) | |
602 | { | |
603 | int error = pm_wake_unlock(buf); | |
604 | return error ? error : n; | |
605 | } | |
606 | ||
607 | power_attr(wake_unlock); | |
608 | ||
609 | #endif /* CONFIG_PM_WAKELOCKS */ | |
c125e96f RW |
610 | #endif /* CONFIG_PM_SLEEP */ |
611 | ||
c5c6ba4e RW |
612 | #ifdef CONFIG_PM_TRACE |
613 | int pm_trace_enabled; | |
614 | ||
386f275f KS |
615 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
616 | char *buf) | |
c5c6ba4e RW |
617 | { |
618 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
619 | } | |
620 | ||
621 | static ssize_t | |
386f275f KS |
622 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
623 | const char *buf, size_t n) | |
c5c6ba4e RW |
624 | { |
625 | int val; | |
626 | ||
627 | if (sscanf(buf, "%d", &val) == 1) { | |
628 | pm_trace_enabled = !!val; | |
9dceefe4 SK |
629 | if (pm_trace_enabled) { |
630 | pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" | |
631 | "PM: Correct system time has to be restored manually after resume.\n"); | |
632 | } | |
c5c6ba4e RW |
633 | return n; |
634 | } | |
635 | return -EINVAL; | |
636 | } | |
637 | ||
638 | power_attr(pm_trace); | |
d33ac60b JH |
639 | |
640 | static ssize_t pm_trace_dev_match_show(struct kobject *kobj, | |
641 | struct kobj_attribute *attr, | |
642 | char *buf) | |
643 | { | |
644 | return show_trace_dev_match(buf, PAGE_SIZE); | |
645 | } | |
646 | ||
a1e9ca69 | 647 | power_attr_ro(pm_trace_dev_match); |
d33ac60b | 648 | |
0e7d56e3 | 649 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e | 650 | |
957d1282 LF |
651 | #ifdef CONFIG_FREEZER |
652 | static ssize_t pm_freeze_timeout_show(struct kobject *kobj, | |
653 | struct kobj_attribute *attr, char *buf) | |
654 | { | |
655 | return sprintf(buf, "%u\n", freeze_timeout_msecs); | |
656 | } | |
657 | ||
658 | static ssize_t pm_freeze_timeout_store(struct kobject *kobj, | |
659 | struct kobj_attribute *attr, | |
660 | const char *buf, size_t n) | |
661 | { | |
662 | unsigned long val; | |
663 | ||
664 | if (kstrtoul(buf, 10, &val)) | |
665 | return -EINVAL; | |
666 | ||
667 | freeze_timeout_msecs = val; | |
668 | return n; | |
669 | } | |
670 | ||
671 | power_attr(pm_freeze_timeout); | |
672 | ||
673 | #endif /* CONFIG_FREEZER*/ | |
674 | ||
c5c6ba4e RW |
675 | static struct attribute * g[] = { |
676 | &state_attr.attr, | |
0e7d56e3 | 677 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 678 | &pm_trace_attr.attr, |
d33ac60b | 679 | &pm_trace_dev_match_attr.attr, |
0e7d56e3 | 680 | #endif |
0e06b4a8 RW |
681 | #ifdef CONFIG_PM_SLEEP |
682 | &pm_async_attr.attr, | |
c125e96f | 683 | &wakeup_count_attr.attr, |
406e7938 RW |
684 | #ifdef CONFIG_SUSPEND |
685 | &mem_sleep_attr.attr, | |
686 | #endif | |
7483b4a4 RW |
687 | #ifdef CONFIG_PM_AUTOSLEEP |
688 | &autosleep_attr.attr, | |
689 | #endif | |
b86ff982 RW |
690 | #ifdef CONFIG_PM_WAKELOCKS |
691 | &wake_lock_attr.attr, | |
692 | &wake_unlock_attr.attr, | |
693 | #endif | |
0e06b4a8 | 694 | #ifdef CONFIG_PM_DEBUG |
0e7d56e3 | 695 | &pm_test_attr.attr, |
b2df1d4f RW |
696 | #endif |
697 | #ifdef CONFIG_PM_SLEEP_DEBUG | |
4b7760ba | 698 | &pm_print_times_attr.attr, |
a6f5f0dd | 699 | &pm_wakeup_irq_attr.attr, |
0e06b4a8 | 700 | #endif |
957d1282 LF |
701 | #endif |
702 | #ifdef CONFIG_FREEZER | |
703 | &pm_freeze_timeout_attr.attr, | |
0e7d56e3 | 704 | #endif |
c5c6ba4e RW |
705 | NULL, |
706 | }; | |
1da177e4 LT |
707 | |
708 | static struct attribute_group attr_group = { | |
709 | .attrs = g, | |
710 | }; | |
711 | ||
5e928f77 | 712 | struct workqueue_struct *pm_wq; |
7b199ca2 | 713 | EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77 RW |
714 | |
715 | static int __init pm_start_workqueue(void) | |
716 | { | |
58a69cb4 | 717 | pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77 RW |
718 | |
719 | return pm_wq ? 0 : -ENOMEM; | |
720 | } | |
5e928f77 | 721 | |
1da177e4 LT |
722 | static int __init pm_init(void) |
723 | { | |
5e928f77 RW |
724 | int error = pm_start_workqueue(); |
725 | if (error) | |
726 | return error; | |
ac5c24ec | 727 | hibernate_image_size_init(); |
ddeb6487 | 728 | hibernate_reserved_size_init(); |
fa7fd6fa | 729 | pm_states_init(); |
d76e15fb GKH |
730 | power_kobj = kobject_create_and_add("power", NULL); |
731 | if (!power_kobj) | |
039a5dcd | 732 | return -ENOMEM; |
7483b4a4 RW |
733 | error = sysfs_create_group(power_kobj, &attr_group); |
734 | if (error) | |
735 | return error; | |
b2df1d4f | 736 | pm_print_times_init(); |
7483b4a4 | 737 | return pm_autosleep_init(); |
1da177e4 LT |
738 | } |
739 | ||
740 | core_initcall(pm_init); |