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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 | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | */ | |
10 | ||
4cf30348 | 11 | #include <linux/module.h> |
1da177e4 LT |
12 | #include <linux/suspend.h> |
13 | #include <linux/kobject.h> | |
14 | #include <linux/string.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/errno.h> | |
1bfcf130 | 17 | #include <linux/kmod.h> |
1da177e4 | 18 | #include <linux/init.h> |
6cc07191 | 19 | #include <linux/console.h> |
e3920fb4 | 20 | #include <linux/cpu.h> |
c5c6ba4e | 21 | #include <linux/resume-trace.h> |
7dfb7103 | 22 | #include <linux/freezer.h> |
96177299 | 23 | #include <linux/vmstat.h> |
232b1432 | 24 | #include <linux/syscalls.h> |
1da177e4 LT |
25 | |
26 | #include "power.h" | |
27 | ||
a6d70980 | 28 | DEFINE_MUTEX(pm_mutex); |
1da177e4 | 29 | |
9f9adecd LB |
30 | unsigned int pm_flags; |
31 | EXPORT_SYMBOL(pm_flags); | |
32 | ||
82525756 AS |
33 | #ifdef CONFIG_PM_SLEEP |
34 | ||
35 | /* Routines for PM-transition notifications */ | |
36 | ||
37 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
38 | ||
39 | int register_pm_notifier(struct notifier_block *nb) | |
40 | { | |
41 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
42 | } | |
43 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
44 | ||
45 | int unregister_pm_notifier(struct notifier_block *nb) | |
46 | { | |
47 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
48 | } | |
49 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
50 | ||
51 | int pm_notifier_call_chain(unsigned long val) | |
52 | { | |
53 | return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) | |
54 | == NOTIFY_BAD) ? -EINVAL : 0; | |
55 | } | |
56 | ||
0e7d56e3 RW |
57 | #ifdef CONFIG_PM_DEBUG |
58 | int pm_test_level = TEST_NONE; | |
59 | ||
0e7d56e3 RW |
60 | static const char * const pm_tests[__TEST_AFTER_LAST] = { |
61 | [TEST_NONE] = "none", | |
62 | [TEST_CORE] = "core", | |
63 | [TEST_CPUS] = "processors", | |
64 | [TEST_PLATFORM] = "platform", | |
65 | [TEST_DEVICES] = "devices", | |
66 | [TEST_FREEZER] = "freezer", | |
67 | }; | |
68 | ||
039a75c6 RW |
69 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
70 | char *buf) | |
0e7d56e3 RW |
71 | { |
72 | char *s = buf; | |
73 | int level; | |
74 | ||
75 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
76 | if (pm_tests[level]) { | |
77 | if (level == pm_test_level) | |
78 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
79 | else | |
80 | s += sprintf(s, "%s ", pm_tests[level]); | |
81 | } | |
82 | ||
83 | if (s != buf) | |
84 | /* convert the last space to a newline */ | |
85 | *(s-1) = '\n'; | |
86 | ||
87 | return (s - buf); | |
88 | } | |
89 | ||
039a75c6 RW |
90 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
91 | const char *buf, size_t n) | |
0e7d56e3 RW |
92 | { |
93 | const char * const *s; | |
94 | int level; | |
95 | char *p; | |
96 | int len; | |
97 | int error = -EINVAL; | |
98 | ||
99 | p = memchr(buf, '\n', n); | |
100 | len = p ? p - buf : n; | |
101 | ||
102 | mutex_lock(&pm_mutex); | |
103 | ||
104 | level = TEST_FIRST; | |
105 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
106 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
107 | pm_test_level = level; | |
108 | error = 0; | |
109 | break; | |
110 | } | |
111 | ||
112 | mutex_unlock(&pm_mutex); | |
113 | ||
114 | return error ? error : n; | |
115 | } | |
116 | ||
117 | power_attr(pm_test); | |
091d71e0 | 118 | #endif /* CONFIG_PM_DEBUG */ |
0e7d56e3 | 119 | |
7671b8ae | 120 | #endif /* CONFIG_PM_SLEEP */ |
039a75c6 | 121 | |
296699de RW |
122 | #ifdef CONFIG_SUSPEND |
123 | ||
091d71e0 RW |
124 | static int suspend_test(int level) |
125 | { | |
126 | #ifdef CONFIG_PM_DEBUG | |
127 | if (pm_test_level == level) { | |
128 | printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n"); | |
129 | mdelay(5000); | |
130 | return 1; | |
131 | } | |
132 | #endif /* !CONFIG_PM_DEBUG */ | |
133 | return 0; | |
134 | } | |
135 | ||
77437fd4 DB |
136 | #ifdef CONFIG_PM_TEST_SUSPEND |
137 | ||
138 | /* | |
139 | * We test the system suspend code by setting an RTC wakealarm a short | |
140 | * time in the future, then suspending. Suspending the devices won't | |
141 | * normally take long ... some systems only need a few milliseconds. | |
142 | * | |
143 | * The time it takes is system-specific though, so when we test this | |
144 | * during system bootup we allow a LOT of time. | |
145 | */ | |
146 | #define TEST_SUSPEND_SECONDS 5 | |
147 | ||
148 | static unsigned long suspend_test_start_time; | |
149 | ||
150 | static void suspend_test_start(void) | |
151 | { | |
152 | /* FIXME Use better timebase than "jiffies", ideally a clocksource. | |
153 | * What we want is a hardware counter that will work correctly even | |
154 | * during the irqs-are-off stages of the suspend/resume cycle... | |
155 | */ | |
156 | suspend_test_start_time = jiffies; | |
157 | } | |
158 | ||
159 | static void suspend_test_finish(const char *label) | |
160 | { | |
161 | long nj = jiffies - suspend_test_start_time; | |
162 | unsigned msec; | |
163 | ||
164 | msec = jiffies_to_msecs(abs(nj)); | |
165 | pr_info("PM: %s took %d.%03d seconds\n", label, | |
166 | msec / 1000, msec % 1000); | |
167 | ||
168 | /* Warning on suspend means the RTC alarm period needs to be | |
169 | * larger -- the system was sooo slooowwww to suspend that the | |
170 | * alarm (should have) fired before the system went to sleep! | |
171 | * | |
172 | * Warning on either suspend or resume also means the system | |
173 | * has some performance issues. The stack dump of a WARN_ON | |
174 | * is more likely to get the right attention than a printk... | |
175 | */ | |
a6a0c4ca | 176 | WARN(msec > (TEST_SUSPEND_SECONDS * 1000), "Component: %s\n", label); |
77437fd4 DB |
177 | } |
178 | ||
179 | #else | |
180 | ||
181 | static void suspend_test_start(void) | |
182 | { | |
183 | } | |
184 | ||
185 | static void suspend_test_finish(const char *label) | |
186 | { | |
187 | } | |
188 | ||
189 | #endif | |
190 | ||
296699de RW |
191 | /* This is just an arbitrary number */ |
192 | #define FREE_PAGE_NUMBER (100) | |
193 | ||
f242d919 | 194 | static struct platform_suspend_ops *suspend_ops; |
1da177e4 LT |
195 | |
196 | /** | |
26398a70 | 197 | * suspend_set_ops - Set the global suspend method table. |
1da177e4 LT |
198 | * @ops: Pointer to ops structure. |
199 | */ | |
200 | ||
26398a70 | 201 | void suspend_set_ops(struct platform_suspend_ops *ops) |
1da177e4 | 202 | { |
a6d70980 | 203 | mutex_lock(&pm_mutex); |
26398a70 | 204 | suspend_ops = ops; |
a6d70980 | 205 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
206 | } |
207 | ||
e8c9c502 | 208 | /** |
26398a70 | 209 | * suspend_valid_only_mem - generic memory-only valid callback |
e8c9c502 | 210 | * |
26398a70 | 211 | * Platform drivers that implement mem suspend only and only need |
e8c9c502 JB |
212 | * to check for that in their .valid callback can use this instead |
213 | * of rolling their own .valid callback. | |
214 | */ | |
26398a70 | 215 | int suspend_valid_only_mem(suspend_state_t state) |
e8c9c502 JB |
216 | { |
217 | return state == PM_SUSPEND_MEM; | |
218 | } | |
219 | ||
1da177e4 LT |
220 | /** |
221 | * suspend_prepare - Do prep work before entering low-power state. | |
1da177e4 | 222 | * |
6c961dfb RW |
223 | * This is common code that is called for each state that we're entering. |
224 | * Run suspend notifiers, allocate a console and stop all processes. | |
1da177e4 | 225 | */ |
6c961dfb | 226 | static int suspend_prepare(void) |
1da177e4 | 227 | { |
e3920fb4 | 228 | int error; |
5ae947ec | 229 | unsigned int free_pages; |
1da177e4 | 230 | |
26398a70 | 231 | if (!suspend_ops || !suspend_ops->enter) |
1da177e4 LT |
232 | return -EPERM; |
233 | ||
af258f51 JB |
234 | pm_prepare_console(); |
235 | ||
b10d9117 RW |
236 | error = pm_notifier_call_chain(PM_SUSPEND_PREPARE); |
237 | if (error) | |
238 | goto Finish; | |
239 | ||
1bfcf130 RW |
240 | error = usermodehelper_disable(); |
241 | if (error) | |
242 | goto Finish; | |
243 | ||
b28f5081 | 244 | if (suspend_freeze_processes()) { |
1da177e4 LT |
245 | error = -EAGAIN; |
246 | goto Thaw; | |
247 | } | |
248 | ||
6c961dfb RW |
249 | free_pages = global_page_state(NR_FREE_PAGES); |
250 | if (free_pages < FREE_PAGE_NUMBER) { | |
5ae947ec DSL |
251 | pr_debug("PM: free some memory\n"); |
252 | shrink_all_memory(FREE_PAGE_NUMBER - free_pages); | |
253 | if (nr_free_pages() < FREE_PAGE_NUMBER) { | |
254 | error = -ENOMEM; | |
255 | printk(KERN_ERR "PM: No enough memory\n"); | |
5ae947ec DSL |
256 | } |
257 | } | |
e3c7db62 RW |
258 | if (!error) |
259 | return 0; | |
260 | ||
1da177e4 | 261 | Thaw: |
b28f5081 | 262 | suspend_thaw_processes(); |
1bfcf130 | 263 | usermodehelper_enable(); |
b10d9117 RW |
264 | Finish: |
265 | pm_notifier_call_chain(PM_POST_SUSPEND); | |
af258f51 | 266 | pm_restore_console(); |
1da177e4 LT |
267 | return error; |
268 | } | |
269 | ||
a53c46dc JB |
270 | /* default implementation */ |
271 | void __attribute__ ((weak)) arch_suspend_disable_irqs(void) | |
272 | { | |
273 | local_irq_disable(); | |
274 | } | |
275 | ||
276 | /* default implementation */ | |
277 | void __attribute__ ((weak)) arch_suspend_enable_irqs(void) | |
278 | { | |
279 | local_irq_enable(); | |
280 | } | |
1da177e4 | 281 | |
6c961dfb RW |
282 | /** |
283 | * suspend_enter - enter the desired system sleep state. | |
284 | * @state: state to enter | |
285 | * | |
286 | * This function should be called after devices have been suspended. | |
287 | */ | |
a065c86e | 288 | static int suspend_enter(suspend_state_t state) |
1da177e4 | 289 | { |
2ed8d2b3 | 290 | int error; |
1da177e4 | 291 | |
6a7c7eaf RW |
292 | if (suspend_ops->prepare) { |
293 | error = suspend_ops->prepare(); | |
294 | if (error) | |
32bdfac5 | 295 | return error; |
6a7c7eaf RW |
296 | } |
297 | ||
2ed8d2b3 RW |
298 | error = device_power_down(PMSG_SUSPEND); |
299 | if (error) { | |
465d2b47 | 300 | printk(KERN_ERR "PM: Some devices failed to power down\n"); |
6a7c7eaf | 301 | goto Platfrom_finish; |
1da177e4 | 302 | } |
0e7d56e3 | 303 | |
6a7c7eaf RW |
304 | if (suspend_ops->prepare_late) { |
305 | error = suspend_ops->prepare_late(); | |
900af0d9 RW |
306 | if (error) |
307 | goto Power_up_devices; | |
308 | } | |
309 | ||
310 | if (suspend_test(TEST_PLATFORM)) | |
6a7c7eaf | 311 | goto Platform_wake; |
900af0d9 RW |
312 | |
313 | error = disable_nonboot_cpus(); | |
314 | if (error || suspend_test(TEST_CPUS)) | |
315 | goto Enable_cpus; | |
316 | ||
2ed8d2b3 RW |
317 | arch_suspend_disable_irqs(); |
318 | BUG_ON(!irqs_disabled()); | |
319 | ||
770824bd RW |
320 | error = sysdev_suspend(PMSG_SUSPEND); |
321 | if (!error) { | |
322 | if (!suspend_test(TEST_CORE)) | |
323 | error = suspend_ops->enter(state); | |
324 | sysdev_resume(); | |
325 | } | |
0e7d56e3 | 326 | |
a53c46dc JB |
327 | arch_suspend_enable_irqs(); |
328 | BUG_ON(irqs_disabled()); | |
2ed8d2b3 | 329 | |
900af0d9 RW |
330 | Enable_cpus: |
331 | enable_nonboot_cpus(); | |
332 | ||
6a7c7eaf RW |
333 | Platform_wake: |
334 | if (suspend_ops->wake) | |
335 | suspend_ops->wake(); | |
900af0d9 RW |
336 | |
337 | Power_up_devices: | |
2ed8d2b3 RW |
338 | device_power_up(PMSG_RESUME); |
339 | ||
6a7c7eaf RW |
340 | Platfrom_finish: |
341 | if (suspend_ops->finish) | |
342 | suspend_ops->finish(); | |
343 | ||
1da177e4 LT |
344 | return error; |
345 | } | |
346 | ||
6c961dfb | 347 | /** |
9628c0ee RW |
348 | * suspend_devices_and_enter - suspend devices and enter the desired system |
349 | * sleep state. | |
6c961dfb RW |
350 | * @state: state to enter |
351 | */ | |
352 | int suspend_devices_and_enter(suspend_state_t state) | |
353 | { | |
cbe2f5a6 | 354 | int error; |
6c961dfb | 355 | |
26398a70 | 356 | if (!suspend_ops) |
6c961dfb RW |
357 | return -ENOSYS; |
358 | ||
c697eece RW |
359 | if (suspend_ops->begin) { |
360 | error = suspend_ops->begin(state); | |
6c961dfb | 361 | if (error) |
c697eece | 362 | goto Close; |
6c961dfb RW |
363 | } |
364 | suspend_console(); | |
77437fd4 | 365 | suspend_test_start(); |
6c961dfb RW |
366 | error = device_suspend(PMSG_SUSPEND); |
367 | if (error) { | |
465d2b47 | 368 | printk(KERN_ERR "PM: Some devices failed to suspend\n"); |
d8f3de0d | 369 | goto Recover_platform; |
6c961dfb | 370 | } |
77437fd4 | 371 | suspend_test_finish("suspend devices"); |
0e7d56e3 | 372 | if (suspend_test(TEST_DEVICES)) |
d8f3de0d | 373 | goto Recover_platform; |
0e7d56e3 | 374 | |
900af0d9 | 375 | suspend_enter(state); |
0e7d56e3 | 376 | |
6c961dfb | 377 | Resume_devices: |
77437fd4 | 378 | suspend_test_start(); |
1eede070 | 379 | device_resume(PMSG_RESUME); |
77437fd4 | 380 | suspend_test_finish("resume devices"); |
6c961dfb | 381 | resume_console(); |
c697eece RW |
382 | Close: |
383 | if (suspend_ops->end) | |
384 | suspend_ops->end(); | |
6c961dfb | 385 | return error; |
d8f3de0d RW |
386 | |
387 | Recover_platform: | |
388 | if (suspend_ops->recover) | |
389 | suspend_ops->recover(); | |
390 | goto Resume_devices; | |
6c961dfb | 391 | } |
1da177e4 LT |
392 | |
393 | /** | |
394 | * suspend_finish - Do final work before exiting suspend sequence. | |
1da177e4 LT |
395 | * |
396 | * Call platform code to clean up, restart processes, and free the | |
397 | * console that we've allocated. This is not called for suspend-to-disk. | |
398 | */ | |
6c961dfb | 399 | static void suspend_finish(void) |
1da177e4 | 400 | { |
b28f5081 | 401 | suspend_thaw_processes(); |
1bfcf130 | 402 | usermodehelper_enable(); |
b10d9117 | 403 | pm_notifier_call_chain(PM_POST_SUSPEND); |
af258f51 | 404 | pm_restore_console(); |
1da177e4 LT |
405 | } |
406 | ||
407 | ||
408 | ||
409 | ||
3b364b8d | 410 | static const char * const pm_states[PM_SUSPEND_MAX] = { |
1da177e4 LT |
411 | [PM_SUSPEND_STANDBY] = "standby", |
412 | [PM_SUSPEND_MEM] = "mem", | |
1da177e4 LT |
413 | }; |
414 | ||
123d3c13 PM |
415 | static inline int valid_state(suspend_state_t state) |
416 | { | |
a3d25c27 RW |
417 | /* All states need lowlevel support and need to be valid |
418 | * to the lowlevel implementation, no valid callback | |
9684e51c | 419 | * implies that none are valid. */ |
26398a70 | 420 | if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state)) |
123d3c13 PM |
421 | return 0; |
422 | return 1; | |
423 | } | |
424 | ||
1da177e4 LT |
425 | |
426 | /** | |
427 | * enter_state - Do common work of entering low-power state. | |
428 | * @state: pm_state structure for state we're entering. | |
429 | * | |
430 | * Make sure we're the only ones trying to enter a sleep state. Fail | |
431 | * if someone has beat us to it, since we don't want anything weird to | |
432 | * happen when we wake up. | |
433 | * Then, do the setup for suspend, enter the state, and cleaup (after | |
434 | * we've woken up). | |
435 | */ | |
1da177e4 LT |
436 | static int enter_state(suspend_state_t state) |
437 | { | |
438 | int error; | |
439 | ||
123d3c13 | 440 | if (!valid_state(state)) |
eb9289eb | 441 | return -ENODEV; |
232b1432 | 442 | |
a6d70980 | 443 | if (!mutex_trylock(&pm_mutex)) |
1da177e4 LT |
444 | return -EBUSY; |
445 | ||
465d2b47 | 446 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
447 | sys_sync(); |
448 | printk("done.\n"); | |
449 | ||
82428b62 | 450 | pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); |
0e7d56e3 RW |
451 | error = suspend_prepare(); |
452 | if (error) | |
1da177e4 LT |
453 | goto Unlock; |
454 | ||
0e7d56e3 RW |
455 | if (suspend_test(TEST_FREEZER)) |
456 | goto Finish; | |
457 | ||
82428b62 | 458 | pr_debug("PM: Entering %s sleep\n", pm_states[state]); |
6c961dfb | 459 | error = suspend_devices_and_enter(state); |
1da177e4 | 460 | |
0e7d56e3 | 461 | Finish: |
82428b62 | 462 | pr_debug("PM: Finishing wakeup.\n"); |
6c961dfb | 463 | suspend_finish(); |
1da177e4 | 464 | Unlock: |
a6d70980 | 465 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
466 | return error; |
467 | } | |
468 | ||
1da177e4 LT |
469 | |
470 | /** | |
471 | * pm_suspend - Externally visible function for suspending system. | |
a3d25c27 | 472 | * @state: Enumerated value of state to enter. |
1da177e4 LT |
473 | * |
474 | * Determine whether or not value is within range, get state | |
475 | * structure, and enter (above). | |
476 | */ | |
477 | ||
478 | int pm_suspend(suspend_state_t state) | |
479 | { | |
e2a5b420 | 480 | if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX) |
1da177e4 LT |
481 | return enter_state(state); |
482 | return -EINVAL; | |
483 | } | |
484 | ||
4cf30348 | 485 | EXPORT_SYMBOL(pm_suspend); |
1da177e4 | 486 | |
296699de RW |
487 | #endif /* CONFIG_SUSPEND */ |
488 | ||
d76e15fb | 489 | struct kobject *power_kobj; |
1da177e4 LT |
490 | |
491 | /** | |
492 | * state - control system power state. | |
493 | * | |
494 | * show() returns what states are supported, which is hard-coded to | |
495 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
496 | * 'disk' (Suspend-to-Disk). | |
497 | * | |
498 | * store() accepts one of those strings, translates it into the | |
499 | * proper enumerated value, and initiates a suspend transition. | |
500 | */ | |
501 | ||
386f275f KS |
502 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
503 | char *buf) | |
1da177e4 | 504 | { |
296699de RW |
505 | char *s = buf; |
506 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 507 | int i; |
1da177e4 LT |
508 | |
509 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
510 | if (pm_states[i] && valid_state(i)) |
511 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 512 | } |
296699de | 513 | #endif |
b0cb1a19 | 514 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
515 | s += sprintf(s, "%s\n", "disk"); |
516 | #else | |
517 | if (s != buf) | |
518 | /* convert the last space to a newline */ | |
519 | *(s-1) = '\n'; | |
520 | #endif | |
1da177e4 LT |
521 | return (s - buf); |
522 | } | |
523 | ||
386f275f KS |
524 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
525 | const char *buf, size_t n) | |
1da177e4 | 526 | { |
296699de | 527 | #ifdef CONFIG_SUSPEND |
1da177e4 | 528 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 529 | const char * const *s; |
296699de | 530 | #endif |
1da177e4 | 531 | char *p; |
1da177e4 | 532 | int len; |
296699de | 533 | int error = -EINVAL; |
1da177e4 LT |
534 | |
535 | p = memchr(buf, '\n', n); | |
536 | len = p ? p - buf : n; | |
537 | ||
a3d25c27 | 538 | /* First, check if we are requested to hibernate */ |
8d98a690 | 539 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 540 | error = hibernate(); |
296699de | 541 | goto Exit; |
a3d25c27 RW |
542 | } |
543 | ||
296699de | 544 | #ifdef CONFIG_SUSPEND |
1da177e4 | 545 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 546 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
547 | break; |
548 | } | |
47bb7899 | 549 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 550 | error = enter_state(state); |
296699de RW |
551 | #endif |
552 | ||
553 | Exit: | |
1da177e4 LT |
554 | return error ? error : n; |
555 | } | |
556 | ||
557 | power_attr(state); | |
558 | ||
c5c6ba4e RW |
559 | #ifdef CONFIG_PM_TRACE |
560 | int pm_trace_enabled; | |
561 | ||
386f275f KS |
562 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
563 | char *buf) | |
c5c6ba4e RW |
564 | { |
565 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
566 | } | |
567 | ||
568 | static ssize_t | |
386f275f KS |
569 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
570 | const char *buf, size_t n) | |
c5c6ba4e RW |
571 | { |
572 | int val; | |
573 | ||
574 | if (sscanf(buf, "%d", &val) == 1) { | |
575 | pm_trace_enabled = !!val; | |
576 | return n; | |
577 | } | |
578 | return -EINVAL; | |
579 | } | |
580 | ||
581 | power_attr(pm_trace); | |
0e7d56e3 | 582 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
583 | |
584 | static struct attribute * g[] = { | |
585 | &state_attr.attr, | |
0e7d56e3 | 586 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 587 | &pm_trace_attr.attr, |
0e7d56e3 | 588 | #endif |
7671b8ae | 589 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG) |
0e7d56e3 RW |
590 | &pm_test_attr.attr, |
591 | #endif | |
c5c6ba4e RW |
592 | NULL, |
593 | }; | |
1da177e4 LT |
594 | |
595 | static struct attribute_group attr_group = { | |
596 | .attrs = g, | |
597 | }; | |
598 | ||
599 | ||
600 | static int __init pm_init(void) | |
601 | { | |
d76e15fb GKH |
602 | power_kobj = kobject_create_and_add("power", NULL); |
603 | if (!power_kobj) | |
039a5dcd | 604 | return -ENOMEM; |
d76e15fb | 605 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
606 | } |
607 | ||
608 | core_initcall(pm_init); | |
77437fd4 DB |
609 | |
610 | ||
611 | #ifdef CONFIG_PM_TEST_SUSPEND | |
612 | ||
613 | #include <linux/rtc.h> | |
614 | ||
615 | /* | |
616 | * To test system suspend, we need a hands-off mechanism to resume the | |
617 | * system. RTCs wake alarms are a common self-contained mechanism. | |
618 | */ | |
619 | ||
620 | static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state) | |
621 | { | |
622 | static char err_readtime[] __initdata = | |
623 | KERN_ERR "PM: can't read %s time, err %d\n"; | |
624 | static char err_wakealarm [] __initdata = | |
625 | KERN_ERR "PM: can't set %s wakealarm, err %d\n"; | |
626 | static char err_suspend[] __initdata = | |
627 | KERN_ERR "PM: suspend test failed, error %d\n"; | |
628 | static char info_test[] __initdata = | |
629 | KERN_INFO "PM: test RTC wakeup from '%s' suspend\n"; | |
630 | ||
631 | unsigned long now; | |
632 | struct rtc_wkalrm alm; | |
633 | int status; | |
634 | ||
635 | /* this may fail if the RTC hasn't been initialized */ | |
636 | status = rtc_read_time(rtc, &alm.time); | |
637 | if (status < 0) { | |
81ff86a1 | 638 | printk(err_readtime, dev_name(&rtc->dev), status); |
77437fd4 DB |
639 | return; |
640 | } | |
641 | rtc_tm_to_time(&alm.time, &now); | |
642 | ||
643 | memset(&alm, 0, sizeof alm); | |
644 | rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time); | |
645 | alm.enabled = true; | |
646 | ||
647 | status = rtc_set_alarm(rtc, &alm); | |
648 | if (status < 0) { | |
81ff86a1 | 649 | printk(err_wakealarm, dev_name(&rtc->dev), status); |
77437fd4 DB |
650 | return; |
651 | } | |
652 | ||
653 | if (state == PM_SUSPEND_MEM) { | |
654 | printk(info_test, pm_states[state]); | |
655 | status = pm_suspend(state); | |
656 | if (status == -ENODEV) | |
657 | state = PM_SUSPEND_STANDBY; | |
658 | } | |
659 | if (state == PM_SUSPEND_STANDBY) { | |
660 | printk(info_test, pm_states[state]); | |
661 | status = pm_suspend(state); | |
662 | } | |
663 | if (status < 0) | |
664 | printk(err_suspend, status); | |
a2e2e357 DB |
665 | |
666 | /* Some platforms can't detect that the alarm triggered the | |
667 | * wakeup, or (accordingly) disable it after it afterwards. | |
668 | * It's supposed to give oneshot behavior; cope. | |
669 | */ | |
670 | alm.enabled = false; | |
671 | rtc_set_alarm(rtc, &alm); | |
77437fd4 DB |
672 | } |
673 | ||
674 | static int __init has_wakealarm(struct device *dev, void *name_ptr) | |
675 | { | |
676 | struct rtc_device *candidate = to_rtc_device(dev); | |
677 | ||
678 | if (!candidate->ops->set_alarm) | |
679 | return 0; | |
680 | if (!device_may_wakeup(candidate->dev.parent)) | |
681 | return 0; | |
682 | ||
81ff86a1 | 683 | *(const char **)name_ptr = dev_name(dev); |
77437fd4 DB |
684 | return 1; |
685 | } | |
686 | ||
687 | /* | |
688 | * Kernel options like "test_suspend=mem" force suspend/resume sanity tests | |
689 | * at startup time. They're normally disabled, for faster boot and because | |
690 | * we can't know which states really work on this particular system. | |
691 | */ | |
692 | static suspend_state_t test_state __initdata = PM_SUSPEND_ON; | |
693 | ||
694 | static char warn_bad_state[] __initdata = | |
695 | KERN_WARNING "PM: can't test '%s' suspend state\n"; | |
696 | ||
697 | static int __init setup_test_suspend(char *value) | |
698 | { | |
699 | unsigned i; | |
700 | ||
701 | /* "=mem" ==> "mem" */ | |
702 | value++; | |
703 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
704 | if (!pm_states[i]) | |
705 | continue; | |
706 | if (strcmp(pm_states[i], value) != 0) | |
707 | continue; | |
708 | test_state = (__force suspend_state_t) i; | |
709 | return 0; | |
710 | } | |
711 | printk(warn_bad_state, value); | |
712 | return 0; | |
713 | } | |
714 | __setup("test_suspend", setup_test_suspend); | |
715 | ||
716 | static int __init test_suspend(void) | |
717 | { | |
718 | static char warn_no_rtc[] __initdata = | |
719 | KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n"; | |
720 | ||
721 | char *pony = NULL; | |
722 | struct rtc_device *rtc = NULL; | |
723 | ||
724 | /* PM is initialized by now; is that state testable? */ | |
725 | if (test_state == PM_SUSPEND_ON) | |
726 | goto done; | |
727 | if (!valid_state(test_state)) { | |
728 | printk(warn_bad_state, pm_states[test_state]); | |
729 | goto done; | |
730 | } | |
731 | ||
732 | /* RTCs have initialized by now too ... can we use one? */ | |
733 | class_find_device(rtc_class, NULL, &pony, has_wakealarm); | |
734 | if (pony) | |
735 | rtc = rtc_class_open(pony); | |
736 | if (!rtc) { | |
737 | printk(warn_no_rtc); | |
738 | goto done; | |
739 | } | |
740 | ||
741 | /* go for it */ | |
742 | test_wakealarm(rtc, test_state); | |
743 | rtc_class_close(rtc); | |
744 | done: | |
745 | return 0; | |
746 | } | |
747 | late_initcall(test_suspend); | |
748 | ||
749 | #endif /* CONFIG_PM_TEST_SUSPEND */ |