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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 | ||
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 | ||
e516a1db | 153 | #ifdef CONFIG_PM_SLEEP_DEBUG |
0e7d56e3 RW |
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); | |
e516a1db | 214 | #endif /* CONFIG_PM_SLEEP_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 | |
726fb6b4 | 364 | bool pm_debug_messages_on __read_mostly; |
8d8b2441 RW |
365 | |
366 | static ssize_t pm_debug_messages_show(struct kobject *kobj, | |
367 | struct kobj_attribute *attr, char *buf) | |
368 | { | |
369 | return sprintf(buf, "%d\n", pm_debug_messages_on); | |
370 | } | |
371 | ||
372 | static ssize_t pm_debug_messages_store(struct kobject *kobj, | |
373 | struct kobj_attribute *attr, | |
374 | const char *buf, size_t n) | |
375 | { | |
376 | unsigned long val; | |
377 | ||
378 | if (kstrtoul(buf, 10, &val)) | |
379 | return -EINVAL; | |
380 | ||
381 | if (val > 1) | |
382 | return -EINVAL; | |
383 | ||
384 | pm_debug_messages_on = !!val; | |
385 | return n; | |
386 | } | |
387 | ||
388 | power_attr(pm_debug_messages); | |
389 | ||
390 | /** | |
cb08e035 RW |
391 | * __pm_pr_dbg - Print a suspend debug message to the kernel log. |
392 | * @defer: Whether or not to use printk_deferred() to print the message. | |
8d8b2441 RW |
393 | * @fmt: Message format. |
394 | * | |
395 | * The message will be emitted if enabled through the pm_debug_messages | |
396 | * sysfs attribute. | |
397 | */ | |
cb08e035 | 398 | void __pm_pr_dbg(bool defer, const char *fmt, ...) |
8d8b2441 RW |
399 | { |
400 | struct va_format vaf; | |
401 | va_list args; | |
402 | ||
403 | if (!pm_debug_messages_on) | |
404 | return; | |
405 | ||
406 | va_start(args, fmt); | |
407 | ||
408 | vaf.fmt = fmt; | |
409 | vaf.va = &args; | |
410 | ||
cb08e035 RW |
411 | if (defer) |
412 | printk_deferred(KERN_DEBUG "PM: %pV", &vaf); | |
413 | else | |
414 | printk(KERN_DEBUG "PM: %pV", &vaf); | |
8d8b2441 RW |
415 | |
416 | va_end(args); | |
417 | } | |
418 | ||
819b1bb3 | 419 | #else /* !CONFIG_PM_SLEEP_DEBUG */ |
b2df1d4f RW |
420 | static inline void pm_print_times_init(void) {} |
421 | #endif /* CONFIG_PM_SLEEP_DEBUG */ | |
422 | ||
d76e15fb | 423 | struct kobject *power_kobj; |
1da177e4 LT |
424 | |
425 | /** | |
0399d4db | 426 | * state - control system sleep states. |
1da177e4 | 427 | * |
0399d4db RW |
428 | * show() returns available sleep state labels, which may be "mem", "standby", |
429 | * "freeze" and "disk" (hibernation). See Documentation/power/states.txt for a | |
430 | * description of what they mean. | |
1da177e4 | 431 | * |
0399d4db RW |
432 | * store() accepts one of those strings, translates it into the proper |
433 | * enumerated value, and initiates a suspend transition. | |
1da177e4 | 434 | */ |
386f275f KS |
435 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
436 | char *buf) | |
1da177e4 | 437 | { |
296699de RW |
438 | char *s = buf; |
439 | #ifdef CONFIG_SUSPEND | |
27ddcc65 RW |
440 | suspend_state_t i; |
441 | ||
442 | for (i = PM_SUSPEND_MIN; i < PM_SUSPEND_MAX; i++) | |
d431cbc5 RW |
443 | if (pm_states[i]) |
444 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 445 | |
296699de | 446 | #endif |
a6e15a39 KC |
447 | if (hibernation_available()) |
448 | s += sprintf(s, "disk "); | |
a3d25c27 RW |
449 | if (s != buf) |
450 | /* convert the last space to a newline */ | |
451 | *(s-1) = '\n'; | |
1da177e4 LT |
452 | return (s - buf); |
453 | } | |
454 | ||
7483b4a4 | 455 | static suspend_state_t decode_state(const char *buf, size_t n) |
1da177e4 | 456 | { |
296699de | 457 | #ifdef CONFIG_SUSPEND |
d431cbc5 | 458 | suspend_state_t state; |
296699de | 459 | #endif |
1da177e4 | 460 | char *p; |
1da177e4 LT |
461 | int len; |
462 | ||
463 | p = memchr(buf, '\n', n); | |
464 | len = p ? p - buf : n; | |
465 | ||
7483b4a4 RW |
466 | /* Check hibernation first. */ |
467 | if (len == 4 && !strncmp(buf, "disk", len)) | |
468 | return PM_SUSPEND_MAX; | |
a3d25c27 | 469 | |
296699de | 470 | #ifdef CONFIG_SUSPEND |
d431cbc5 RW |
471 | for (state = PM_SUSPEND_MIN; state < PM_SUSPEND_MAX; state++) { |
472 | const char *label = pm_states[state]; | |
473 | ||
474 | if (label && len == strlen(label) && !strncmp(buf, label, len)) | |
475 | return state; | |
476 | } | |
296699de RW |
477 | #endif |
478 | ||
7483b4a4 RW |
479 | return PM_SUSPEND_ON; |
480 | } | |
481 | ||
482 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, | |
483 | const char *buf, size_t n) | |
484 | { | |
485 | suspend_state_t state; | |
486 | int error; | |
487 | ||
488 | error = pm_autosleep_lock(); | |
489 | if (error) | |
490 | return error; | |
491 | ||
492 | if (pm_autosleep_state() > PM_SUSPEND_ON) { | |
493 | error = -EBUSY; | |
494 | goto out; | |
495 | } | |
496 | ||
497 | state = decode_state(buf, n); | |
406e7938 RW |
498 | if (state < PM_SUSPEND_MAX) { |
499 | if (state == PM_SUSPEND_MEM) | |
500 | state = mem_sleep_current; | |
501 | ||
7483b4a4 | 502 | error = pm_suspend(state); |
406e7938 | 503 | } else if (state == PM_SUSPEND_MAX) { |
7483b4a4 | 504 | error = hibernate(); |
406e7938 | 505 | } else { |
7483b4a4 | 506 | error = -EINVAL; |
406e7938 | 507 | } |
7483b4a4 RW |
508 | |
509 | out: | |
510 | pm_autosleep_unlock(); | |
1da177e4 LT |
511 | return error ? error : n; |
512 | } | |
513 | ||
514 | power_attr(state); | |
515 | ||
c125e96f RW |
516 | #ifdef CONFIG_PM_SLEEP |
517 | /* | |
518 | * The 'wakeup_count' attribute, along with the functions defined in | |
519 | * drivers/base/power/wakeup.c, provides a means by which wakeup events can be | |
520 | * handled in a non-racy way. | |
521 | * | |
522 | * If a wakeup event occurs when the system is in a sleep state, it simply is | |
523 | * woken up. In turn, if an event that would wake the system up from a sleep | |
524 | * state occurs when it is undergoing a transition to that sleep state, the | |
525 | * transition should be aborted. Moreover, if such an event occurs when the | |
526 | * system is in the working state, an attempt to start a transition to the | |
527 | * given sleep state should fail during certain period after the detection of | |
528 | * the event. Using the 'state' attribute alone is not sufficient to satisfy | |
529 | * these requirements, because a wakeup event may occur exactly when 'state' | |
530 | * is being written to and may be delivered to user space right before it is | |
531 | * frozen, so the event will remain only partially processed until the system is | |
532 | * woken up by another event. In particular, it won't cause the transition to | |
533 | * a sleep state to be aborted. | |
534 | * | |
535 | * This difficulty may be overcome if user space uses 'wakeup_count' before | |
536 | * writing to 'state'. It first should read from 'wakeup_count' and store | |
537 | * the read value. Then, after carrying out its own preparations for the system | |
538 | * transition to a sleep state, it should write the stored value to | |
25985edc | 539 | * 'wakeup_count'. If that fails, at least one wakeup event has occurred since |
c125e96f RW |
540 | * 'wakeup_count' was read and 'state' should not be written to. Otherwise, it |
541 | * is allowed to write to 'state', but the transition will be aborted if there | |
542 | * are any wakeup events detected after 'wakeup_count' was written to. | |
543 | */ | |
544 | ||
545 | static ssize_t wakeup_count_show(struct kobject *kobj, | |
546 | struct kobj_attribute *attr, | |
547 | char *buf) | |
548 | { | |
074037ec | 549 | unsigned int val; |
c125e96f | 550 | |
7483b4a4 RW |
551 | return pm_get_wakeup_count(&val, true) ? |
552 | sprintf(buf, "%u\n", val) : -EINTR; | |
c125e96f RW |
553 | } |
554 | ||
555 | static ssize_t wakeup_count_store(struct kobject *kobj, | |
556 | struct kobj_attribute *attr, | |
557 | const char *buf, size_t n) | |
558 | { | |
074037ec | 559 | unsigned int val; |
7483b4a4 RW |
560 | int error; |
561 | ||
562 | error = pm_autosleep_lock(); | |
563 | if (error) | |
564 | return error; | |
c125e96f | 565 | |
7483b4a4 RW |
566 | if (pm_autosleep_state() > PM_SUSPEND_ON) { |
567 | error = -EBUSY; | |
568 | goto out; | |
569 | } | |
570 | ||
571 | error = -EINVAL; | |
074037ec | 572 | if (sscanf(buf, "%u", &val) == 1) { |
c125e96f | 573 | if (pm_save_wakeup_count(val)) |
7483b4a4 | 574 | error = n; |
bb177fed JW |
575 | else |
576 | pm_print_active_wakeup_sources(); | |
c125e96f | 577 | } |
7483b4a4 RW |
578 | |
579 | out: | |
580 | pm_autosleep_unlock(); | |
581 | return error; | |
c125e96f RW |
582 | } |
583 | ||
584 | power_attr(wakeup_count); | |
7483b4a4 RW |
585 | |
586 | #ifdef CONFIG_PM_AUTOSLEEP | |
587 | static ssize_t autosleep_show(struct kobject *kobj, | |
588 | struct kobj_attribute *attr, | |
589 | char *buf) | |
590 | { | |
591 | suspend_state_t state = pm_autosleep_state(); | |
592 | ||
593 | if (state == PM_SUSPEND_ON) | |
594 | return sprintf(buf, "off\n"); | |
595 | ||
596 | #ifdef CONFIG_SUSPEND | |
597 | if (state < PM_SUSPEND_MAX) | |
d431cbc5 RW |
598 | return sprintf(buf, "%s\n", pm_states[state] ? |
599 | pm_states[state] : "error"); | |
7483b4a4 RW |
600 | #endif |
601 | #ifdef CONFIG_HIBERNATION | |
602 | return sprintf(buf, "disk\n"); | |
603 | #else | |
604 | return sprintf(buf, "error"); | |
605 | #endif | |
606 | } | |
607 | ||
608 | static ssize_t autosleep_store(struct kobject *kobj, | |
609 | struct kobj_attribute *attr, | |
610 | const char *buf, size_t n) | |
611 | { | |
612 | suspend_state_t state = decode_state(buf, n); | |
613 | int error; | |
614 | ||
615 | if (state == PM_SUSPEND_ON | |
040e5bf6 | 616 | && strcmp(buf, "off") && strcmp(buf, "off\n")) |
7483b4a4 RW |
617 | return -EINVAL; |
618 | ||
406e7938 RW |
619 | if (state == PM_SUSPEND_MEM) |
620 | state = mem_sleep_current; | |
621 | ||
7483b4a4 RW |
622 | error = pm_autosleep_set_state(state); |
623 | return error ? error : n; | |
624 | } | |
625 | ||
626 | power_attr(autosleep); | |
627 | #endif /* CONFIG_PM_AUTOSLEEP */ | |
b86ff982 RW |
628 | |
629 | #ifdef CONFIG_PM_WAKELOCKS | |
630 | static ssize_t wake_lock_show(struct kobject *kobj, | |
631 | struct kobj_attribute *attr, | |
632 | char *buf) | |
633 | { | |
634 | return pm_show_wakelocks(buf, true); | |
635 | } | |
636 | ||
637 | static ssize_t wake_lock_store(struct kobject *kobj, | |
638 | struct kobj_attribute *attr, | |
639 | const char *buf, size_t n) | |
640 | { | |
641 | int error = pm_wake_lock(buf); | |
642 | return error ? error : n; | |
643 | } | |
644 | ||
645 | power_attr(wake_lock); | |
646 | ||
647 | static ssize_t wake_unlock_show(struct kobject *kobj, | |
648 | struct kobj_attribute *attr, | |
649 | char *buf) | |
650 | { | |
651 | return pm_show_wakelocks(buf, false); | |
652 | } | |
653 | ||
654 | static ssize_t wake_unlock_store(struct kobject *kobj, | |
655 | struct kobj_attribute *attr, | |
656 | const char *buf, size_t n) | |
657 | { | |
658 | int error = pm_wake_unlock(buf); | |
659 | return error ? error : n; | |
660 | } | |
661 | ||
662 | power_attr(wake_unlock); | |
663 | ||
664 | #endif /* CONFIG_PM_WAKELOCKS */ | |
c125e96f RW |
665 | #endif /* CONFIG_PM_SLEEP */ |
666 | ||
c5c6ba4e RW |
667 | #ifdef CONFIG_PM_TRACE |
668 | int pm_trace_enabled; | |
669 | ||
386f275f KS |
670 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
671 | char *buf) | |
c5c6ba4e RW |
672 | { |
673 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
674 | } | |
675 | ||
676 | static ssize_t | |
386f275f KS |
677 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
678 | const char *buf, size_t n) | |
c5c6ba4e RW |
679 | { |
680 | int val; | |
681 | ||
682 | if (sscanf(buf, "%d", &val) == 1) { | |
683 | pm_trace_enabled = !!val; | |
9dceefe4 SK |
684 | if (pm_trace_enabled) { |
685 | pr_warn("PM: Enabling pm_trace changes system date and time during resume.\n" | |
686 | "PM: Correct system time has to be restored manually after resume.\n"); | |
687 | } | |
c5c6ba4e RW |
688 | return n; |
689 | } | |
690 | return -EINVAL; | |
691 | } | |
692 | ||
693 | power_attr(pm_trace); | |
d33ac60b JH |
694 | |
695 | static ssize_t pm_trace_dev_match_show(struct kobject *kobj, | |
696 | struct kobj_attribute *attr, | |
697 | char *buf) | |
698 | { | |
699 | return show_trace_dev_match(buf, PAGE_SIZE); | |
700 | } | |
701 | ||
a1e9ca69 | 702 | power_attr_ro(pm_trace_dev_match); |
d33ac60b | 703 | |
0e7d56e3 | 704 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e | 705 | |
957d1282 LF |
706 | #ifdef CONFIG_FREEZER |
707 | static ssize_t pm_freeze_timeout_show(struct kobject *kobj, | |
708 | struct kobj_attribute *attr, char *buf) | |
709 | { | |
710 | return sprintf(buf, "%u\n", freeze_timeout_msecs); | |
711 | } | |
712 | ||
713 | static ssize_t pm_freeze_timeout_store(struct kobject *kobj, | |
714 | struct kobj_attribute *attr, | |
715 | const char *buf, size_t n) | |
716 | { | |
717 | unsigned long val; | |
718 | ||
719 | if (kstrtoul(buf, 10, &val)) | |
720 | return -EINVAL; | |
721 | ||
722 | freeze_timeout_msecs = val; | |
723 | return n; | |
724 | } | |
725 | ||
726 | power_attr(pm_freeze_timeout); | |
727 | ||
728 | #endif /* CONFIG_FREEZER*/ | |
729 | ||
c5c6ba4e RW |
730 | static struct attribute * g[] = { |
731 | &state_attr.attr, | |
0e7d56e3 | 732 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 733 | &pm_trace_attr.attr, |
d33ac60b | 734 | &pm_trace_dev_match_attr.attr, |
0e7d56e3 | 735 | #endif |
0e06b4a8 RW |
736 | #ifdef CONFIG_PM_SLEEP |
737 | &pm_async_attr.attr, | |
c125e96f | 738 | &wakeup_count_attr.attr, |
406e7938 RW |
739 | #ifdef CONFIG_SUSPEND |
740 | &mem_sleep_attr.attr, | |
741 | #endif | |
7483b4a4 RW |
742 | #ifdef CONFIG_PM_AUTOSLEEP |
743 | &autosleep_attr.attr, | |
744 | #endif | |
b86ff982 RW |
745 | #ifdef CONFIG_PM_WAKELOCKS |
746 | &wake_lock_attr.attr, | |
747 | &wake_unlock_attr.attr, | |
748 | #endif | |
b2df1d4f | 749 | #ifdef CONFIG_PM_SLEEP_DEBUG |
e516a1db | 750 | &pm_test_attr.attr, |
4b7760ba | 751 | &pm_print_times_attr.attr, |
a6f5f0dd | 752 | &pm_wakeup_irq_attr.attr, |
8d8b2441 | 753 | &pm_debug_messages_attr.attr, |
0e06b4a8 | 754 | #endif |
957d1282 LF |
755 | #endif |
756 | #ifdef CONFIG_FREEZER | |
757 | &pm_freeze_timeout_attr.attr, | |
0e7d56e3 | 758 | #endif |
c5c6ba4e RW |
759 | NULL, |
760 | }; | |
1da177e4 | 761 | |
1d0c6e59 | 762 | static const struct attribute_group attr_group = { |
1da177e4 LT |
763 | .attrs = g, |
764 | }; | |
765 | ||
5e928f77 | 766 | struct workqueue_struct *pm_wq; |
7b199ca2 | 767 | EXPORT_SYMBOL_GPL(pm_wq); |
5e928f77 RW |
768 | |
769 | static int __init pm_start_workqueue(void) | |
770 | { | |
58a69cb4 | 771 | pm_wq = alloc_workqueue("pm", WQ_FREEZABLE, 0); |
5e928f77 RW |
772 | |
773 | return pm_wq ? 0 : -ENOMEM; | |
774 | } | |
5e928f77 | 775 | |
1da177e4 LT |
776 | static int __init pm_init(void) |
777 | { | |
5e928f77 RW |
778 | int error = pm_start_workqueue(); |
779 | if (error) | |
780 | return error; | |
ac5c24ec | 781 | hibernate_image_size_init(); |
ddeb6487 | 782 | hibernate_reserved_size_init(); |
fa7fd6fa | 783 | pm_states_init(); |
d76e15fb GKH |
784 | power_kobj = kobject_create_and_add("power", NULL); |
785 | if (!power_kobj) | |
039a5dcd | 786 | return -ENOMEM; |
7483b4a4 RW |
787 | error = sysfs_create_group(power_kobj, &attr_group); |
788 | if (error) | |
789 | return error; | |
b2df1d4f | 790 | pm_print_times_init(); |
7483b4a4 | 791 | return pm_autosleep_init(); |
1da177e4 LT |
792 | } |
793 | ||
794 | core_initcall(pm_init); |