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 | |
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 | |
1eede070 | 292 | device_pm_lock(); |
1da177e4 | 293 | |
2ed8d2b3 RW |
294 | error = device_power_down(PMSG_SUSPEND); |
295 | if (error) { | |
465d2b47 | 296 | printk(KERN_ERR "PM: Some devices failed to power down\n"); |
1da177e4 LT |
297 | goto Done; |
298 | } | |
0e7d56e3 | 299 | |
2ed8d2b3 RW |
300 | arch_suspend_disable_irqs(); |
301 | BUG_ON(!irqs_disabled()); | |
302 | ||
770824bd RW |
303 | error = sysdev_suspend(PMSG_SUSPEND); |
304 | if (!error) { | |
305 | if (!suspend_test(TEST_CORE)) | |
306 | error = suspend_ops->enter(state); | |
307 | sysdev_resume(); | |
308 | } | |
0e7d56e3 | 309 | |
a53c46dc JB |
310 | arch_suspend_enable_irqs(); |
311 | BUG_ON(irqs_disabled()); | |
2ed8d2b3 RW |
312 | |
313 | device_power_up(PMSG_RESUME); | |
314 | ||
315 | Done: | |
1eede070 | 316 | device_pm_unlock(); |
2ed8d2b3 | 317 | |
1da177e4 LT |
318 | return error; |
319 | } | |
320 | ||
6c961dfb | 321 | /** |
9628c0ee RW |
322 | * suspend_devices_and_enter - suspend devices and enter the desired system |
323 | * sleep state. | |
6c961dfb RW |
324 | * @state: state to enter |
325 | */ | |
326 | int suspend_devices_and_enter(suspend_state_t state) | |
327 | { | |
cbe2f5a6 | 328 | int error; |
6c961dfb | 329 | |
26398a70 | 330 | if (!suspend_ops) |
6c961dfb RW |
331 | return -ENOSYS; |
332 | ||
c697eece RW |
333 | if (suspend_ops->begin) { |
334 | error = suspend_ops->begin(state); | |
6c961dfb | 335 | if (error) |
c697eece | 336 | goto Close; |
6c961dfb RW |
337 | } |
338 | suspend_console(); | |
77437fd4 | 339 | suspend_test_start(); |
6c961dfb RW |
340 | error = device_suspend(PMSG_SUSPEND); |
341 | if (error) { | |
465d2b47 | 342 | printk(KERN_ERR "PM: Some devices failed to suspend\n"); |
d8f3de0d | 343 | goto Recover_platform; |
6c961dfb | 344 | } |
77437fd4 | 345 | suspend_test_finish("suspend devices"); |
0e7d56e3 | 346 | if (suspend_test(TEST_DEVICES)) |
d8f3de0d | 347 | goto Recover_platform; |
0e7d56e3 | 348 | |
26398a70 | 349 | if (suspend_ops->prepare) { |
e6c5eb95 | 350 | error = suspend_ops->prepare(); |
6c961dfb RW |
351 | if (error) |
352 | goto Resume_devices; | |
353 | } | |
0e7d56e3 RW |
354 | |
355 | if (suspend_test(TEST_PLATFORM)) | |
356 | goto Finish; | |
357 | ||
6c961dfb | 358 | error = disable_nonboot_cpus(); |
0e7d56e3 | 359 | if (!error && !suspend_test(TEST_CPUS)) |
6c961dfb RW |
360 | suspend_enter(state); |
361 | ||
362 | enable_nonboot_cpus(); | |
0e7d56e3 | 363 | Finish: |
e6c5eb95 RW |
364 | if (suspend_ops->finish) |
365 | suspend_ops->finish(); | |
6c961dfb | 366 | Resume_devices: |
77437fd4 | 367 | suspend_test_start(); |
1eede070 | 368 | device_resume(PMSG_RESUME); |
77437fd4 | 369 | suspend_test_finish("resume devices"); |
6c961dfb | 370 | resume_console(); |
c697eece RW |
371 | Close: |
372 | if (suspend_ops->end) | |
373 | suspend_ops->end(); | |
6c961dfb | 374 | return error; |
d8f3de0d RW |
375 | |
376 | Recover_platform: | |
377 | if (suspend_ops->recover) | |
378 | suspend_ops->recover(); | |
379 | goto Resume_devices; | |
6c961dfb | 380 | } |
1da177e4 LT |
381 | |
382 | /** | |
383 | * suspend_finish - Do final work before exiting suspend sequence. | |
1da177e4 LT |
384 | * |
385 | * Call platform code to clean up, restart processes, and free the | |
386 | * console that we've allocated. This is not called for suspend-to-disk. | |
387 | */ | |
6c961dfb | 388 | static void suspend_finish(void) |
1da177e4 | 389 | { |
b28f5081 | 390 | suspend_thaw_processes(); |
1bfcf130 | 391 | usermodehelper_enable(); |
b10d9117 | 392 | pm_notifier_call_chain(PM_POST_SUSPEND); |
af258f51 | 393 | pm_restore_console(); |
1da177e4 LT |
394 | } |
395 | ||
396 | ||
397 | ||
398 | ||
3b364b8d | 399 | static const char * const pm_states[PM_SUSPEND_MAX] = { |
1da177e4 LT |
400 | [PM_SUSPEND_STANDBY] = "standby", |
401 | [PM_SUSPEND_MEM] = "mem", | |
1da177e4 LT |
402 | }; |
403 | ||
123d3c13 PM |
404 | static inline int valid_state(suspend_state_t state) |
405 | { | |
a3d25c27 RW |
406 | /* All states need lowlevel support and need to be valid |
407 | * to the lowlevel implementation, no valid callback | |
9684e51c | 408 | * implies that none are valid. */ |
26398a70 | 409 | if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state)) |
123d3c13 PM |
410 | return 0; |
411 | return 1; | |
412 | } | |
413 | ||
1da177e4 LT |
414 | |
415 | /** | |
416 | * enter_state - Do common work of entering low-power state. | |
417 | * @state: pm_state structure for state we're entering. | |
418 | * | |
419 | * Make sure we're the only ones trying to enter a sleep state. Fail | |
420 | * if someone has beat us to it, since we don't want anything weird to | |
421 | * happen when we wake up. | |
422 | * Then, do the setup for suspend, enter the state, and cleaup (after | |
423 | * we've woken up). | |
424 | */ | |
1da177e4 LT |
425 | static int enter_state(suspend_state_t state) |
426 | { | |
427 | int error; | |
428 | ||
123d3c13 | 429 | if (!valid_state(state)) |
eb9289eb | 430 | return -ENODEV; |
232b1432 | 431 | |
a6d70980 | 432 | if (!mutex_trylock(&pm_mutex)) |
1da177e4 LT |
433 | return -EBUSY; |
434 | ||
465d2b47 | 435 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
436 | sys_sync(); |
437 | printk("done.\n"); | |
438 | ||
82428b62 | 439 | pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); |
0e7d56e3 RW |
440 | error = suspend_prepare(); |
441 | if (error) | |
1da177e4 LT |
442 | goto Unlock; |
443 | ||
0e7d56e3 RW |
444 | if (suspend_test(TEST_FREEZER)) |
445 | goto Finish; | |
446 | ||
82428b62 | 447 | pr_debug("PM: Entering %s sleep\n", pm_states[state]); |
6c961dfb | 448 | error = suspend_devices_and_enter(state); |
1da177e4 | 449 | |
0e7d56e3 | 450 | Finish: |
82428b62 | 451 | pr_debug("PM: Finishing wakeup.\n"); |
6c961dfb | 452 | suspend_finish(); |
1da177e4 | 453 | Unlock: |
a6d70980 | 454 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
455 | return error; |
456 | } | |
457 | ||
1da177e4 LT |
458 | |
459 | /** | |
460 | * pm_suspend - Externally visible function for suspending system. | |
a3d25c27 | 461 | * @state: Enumerated value of state to enter. |
1da177e4 LT |
462 | * |
463 | * Determine whether or not value is within range, get state | |
464 | * structure, and enter (above). | |
465 | */ | |
466 | ||
467 | int pm_suspend(suspend_state_t state) | |
468 | { | |
e2a5b420 | 469 | if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX) |
1da177e4 LT |
470 | return enter_state(state); |
471 | return -EINVAL; | |
472 | } | |
473 | ||
4cf30348 | 474 | EXPORT_SYMBOL(pm_suspend); |
1da177e4 | 475 | |
296699de RW |
476 | #endif /* CONFIG_SUSPEND */ |
477 | ||
d76e15fb | 478 | struct kobject *power_kobj; |
1da177e4 LT |
479 | |
480 | /** | |
481 | * state - control system power state. | |
482 | * | |
483 | * show() returns what states are supported, which is hard-coded to | |
484 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
485 | * 'disk' (Suspend-to-Disk). | |
486 | * | |
487 | * store() accepts one of those strings, translates it into the | |
488 | * proper enumerated value, and initiates a suspend transition. | |
489 | */ | |
490 | ||
386f275f KS |
491 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
492 | char *buf) | |
1da177e4 | 493 | { |
296699de RW |
494 | char *s = buf; |
495 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 496 | int i; |
1da177e4 LT |
497 | |
498 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
499 | if (pm_states[i] && valid_state(i)) |
500 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 501 | } |
296699de | 502 | #endif |
b0cb1a19 | 503 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
504 | s += sprintf(s, "%s\n", "disk"); |
505 | #else | |
506 | if (s != buf) | |
507 | /* convert the last space to a newline */ | |
508 | *(s-1) = '\n'; | |
509 | #endif | |
1da177e4 LT |
510 | return (s - buf); |
511 | } | |
512 | ||
386f275f KS |
513 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
514 | const char *buf, size_t n) | |
1da177e4 | 515 | { |
296699de | 516 | #ifdef CONFIG_SUSPEND |
1da177e4 | 517 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 518 | const char * const *s; |
296699de | 519 | #endif |
1da177e4 | 520 | char *p; |
1da177e4 | 521 | int len; |
296699de | 522 | int error = -EINVAL; |
1da177e4 LT |
523 | |
524 | p = memchr(buf, '\n', n); | |
525 | len = p ? p - buf : n; | |
526 | ||
a3d25c27 | 527 | /* First, check if we are requested to hibernate */ |
8d98a690 | 528 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 529 | error = hibernate(); |
296699de | 530 | goto Exit; |
a3d25c27 RW |
531 | } |
532 | ||
296699de | 533 | #ifdef CONFIG_SUSPEND |
1da177e4 | 534 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 535 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
536 | break; |
537 | } | |
47bb7899 | 538 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 539 | error = enter_state(state); |
296699de RW |
540 | #endif |
541 | ||
542 | Exit: | |
1da177e4 LT |
543 | return error ? error : n; |
544 | } | |
545 | ||
546 | power_attr(state); | |
547 | ||
c5c6ba4e RW |
548 | #ifdef CONFIG_PM_TRACE |
549 | int pm_trace_enabled; | |
550 | ||
386f275f KS |
551 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
552 | char *buf) | |
c5c6ba4e RW |
553 | { |
554 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
555 | } | |
556 | ||
557 | static ssize_t | |
386f275f KS |
558 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
559 | const char *buf, size_t n) | |
c5c6ba4e RW |
560 | { |
561 | int val; | |
562 | ||
563 | if (sscanf(buf, "%d", &val) == 1) { | |
564 | pm_trace_enabled = !!val; | |
565 | return n; | |
566 | } | |
567 | return -EINVAL; | |
568 | } | |
569 | ||
570 | power_attr(pm_trace); | |
0e7d56e3 | 571 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
572 | |
573 | static struct attribute * g[] = { | |
574 | &state_attr.attr, | |
0e7d56e3 | 575 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 576 | &pm_trace_attr.attr, |
0e7d56e3 | 577 | #endif |
7671b8ae | 578 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG) |
0e7d56e3 RW |
579 | &pm_test_attr.attr, |
580 | #endif | |
c5c6ba4e RW |
581 | NULL, |
582 | }; | |
1da177e4 LT |
583 | |
584 | static struct attribute_group attr_group = { | |
585 | .attrs = g, | |
586 | }; | |
587 | ||
588 | ||
589 | static int __init pm_init(void) | |
590 | { | |
d76e15fb GKH |
591 | power_kobj = kobject_create_and_add("power", NULL); |
592 | if (!power_kobj) | |
039a5dcd | 593 | return -ENOMEM; |
d76e15fb | 594 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
595 | } |
596 | ||
597 | core_initcall(pm_init); | |
77437fd4 DB |
598 | |
599 | ||
600 | #ifdef CONFIG_PM_TEST_SUSPEND | |
601 | ||
602 | #include <linux/rtc.h> | |
603 | ||
604 | /* | |
605 | * To test system suspend, we need a hands-off mechanism to resume the | |
606 | * system. RTCs wake alarms are a common self-contained mechanism. | |
607 | */ | |
608 | ||
609 | static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state) | |
610 | { | |
611 | static char err_readtime[] __initdata = | |
612 | KERN_ERR "PM: can't read %s time, err %d\n"; | |
613 | static char err_wakealarm [] __initdata = | |
614 | KERN_ERR "PM: can't set %s wakealarm, err %d\n"; | |
615 | static char err_suspend[] __initdata = | |
616 | KERN_ERR "PM: suspend test failed, error %d\n"; | |
617 | static char info_test[] __initdata = | |
618 | KERN_INFO "PM: test RTC wakeup from '%s' suspend\n"; | |
619 | ||
620 | unsigned long now; | |
621 | struct rtc_wkalrm alm; | |
622 | int status; | |
623 | ||
624 | /* this may fail if the RTC hasn't been initialized */ | |
625 | status = rtc_read_time(rtc, &alm.time); | |
626 | if (status < 0) { | |
81ff86a1 | 627 | printk(err_readtime, dev_name(&rtc->dev), status); |
77437fd4 DB |
628 | return; |
629 | } | |
630 | rtc_tm_to_time(&alm.time, &now); | |
631 | ||
632 | memset(&alm, 0, sizeof alm); | |
633 | rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time); | |
634 | alm.enabled = true; | |
635 | ||
636 | status = rtc_set_alarm(rtc, &alm); | |
637 | if (status < 0) { | |
81ff86a1 | 638 | printk(err_wakealarm, dev_name(&rtc->dev), status); |
77437fd4 DB |
639 | return; |
640 | } | |
641 | ||
642 | if (state == PM_SUSPEND_MEM) { | |
643 | printk(info_test, pm_states[state]); | |
644 | status = pm_suspend(state); | |
645 | if (status == -ENODEV) | |
646 | state = PM_SUSPEND_STANDBY; | |
647 | } | |
648 | if (state == PM_SUSPEND_STANDBY) { | |
649 | printk(info_test, pm_states[state]); | |
650 | status = pm_suspend(state); | |
651 | } | |
652 | if (status < 0) | |
653 | printk(err_suspend, status); | |
a2e2e357 DB |
654 | |
655 | /* Some platforms can't detect that the alarm triggered the | |
656 | * wakeup, or (accordingly) disable it after it afterwards. | |
657 | * It's supposed to give oneshot behavior; cope. | |
658 | */ | |
659 | alm.enabled = false; | |
660 | rtc_set_alarm(rtc, &alm); | |
77437fd4 DB |
661 | } |
662 | ||
663 | static int __init has_wakealarm(struct device *dev, void *name_ptr) | |
664 | { | |
665 | struct rtc_device *candidate = to_rtc_device(dev); | |
666 | ||
667 | if (!candidate->ops->set_alarm) | |
668 | return 0; | |
669 | if (!device_may_wakeup(candidate->dev.parent)) | |
670 | return 0; | |
671 | ||
81ff86a1 | 672 | *(const char **)name_ptr = dev_name(dev); |
77437fd4 DB |
673 | return 1; |
674 | } | |
675 | ||
676 | /* | |
677 | * Kernel options like "test_suspend=mem" force suspend/resume sanity tests | |
678 | * at startup time. They're normally disabled, for faster boot and because | |
679 | * we can't know which states really work on this particular system. | |
680 | */ | |
681 | static suspend_state_t test_state __initdata = PM_SUSPEND_ON; | |
682 | ||
683 | static char warn_bad_state[] __initdata = | |
684 | KERN_WARNING "PM: can't test '%s' suspend state\n"; | |
685 | ||
686 | static int __init setup_test_suspend(char *value) | |
687 | { | |
688 | unsigned i; | |
689 | ||
690 | /* "=mem" ==> "mem" */ | |
691 | value++; | |
692 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
693 | if (!pm_states[i]) | |
694 | continue; | |
695 | if (strcmp(pm_states[i], value) != 0) | |
696 | continue; | |
697 | test_state = (__force suspend_state_t) i; | |
698 | return 0; | |
699 | } | |
700 | printk(warn_bad_state, value); | |
701 | return 0; | |
702 | } | |
703 | __setup("test_suspend", setup_test_suspend); | |
704 | ||
705 | static int __init test_suspend(void) | |
706 | { | |
707 | static char warn_no_rtc[] __initdata = | |
708 | KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n"; | |
709 | ||
710 | char *pony = NULL; | |
711 | struct rtc_device *rtc = NULL; | |
712 | ||
713 | /* PM is initialized by now; is that state testable? */ | |
714 | if (test_state == PM_SUSPEND_ON) | |
715 | goto done; | |
716 | if (!valid_state(test_state)) { | |
717 | printk(warn_bad_state, pm_states[test_state]); | |
718 | goto done; | |
719 | } | |
720 | ||
721 | /* RTCs have initialized by now too ... can we use one? */ | |
722 | class_find_device(rtc_class, NULL, &pony, has_wakealarm); | |
723 | if (pony) | |
724 | rtc = rtc_class_open(pony); | |
725 | if (!rtc) { | |
726 | printk(warn_no_rtc); | |
727 | goto done; | |
728 | } | |
729 | ||
730 | /* go for it */ | |
731 | test_wakealarm(rtc, test_state); | |
732 | rtc_class_close(rtc); | |
733 | done: | |
734 | return 0; | |
735 | } | |
736 | late_initcall(test_suspend); | |
737 | ||
738 | #endif /* CONFIG_PM_TEST_SUSPEND */ |