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 LT |
289 | { |
290 | int error = 0; | |
1da177e4 | 291 | |
1eede070 | 292 | device_pm_lock(); |
a53c46dc JB |
293 | arch_suspend_disable_irqs(); |
294 | BUG_ON(!irqs_disabled()); | |
1da177e4 LT |
295 | |
296 | if ((error = device_power_down(PMSG_SUSPEND))) { | |
465d2b47 | 297 | printk(KERN_ERR "PM: Some devices failed to power down\n"); |
1da177e4 LT |
298 | goto Done; |
299 | } | |
0e7d56e3 | 300 | |
770824bd RW |
301 | error = sysdev_suspend(PMSG_SUSPEND); |
302 | if (!error) { | |
303 | if (!suspend_test(TEST_CORE)) | |
304 | error = suspend_ops->enter(state); | |
305 | sysdev_resume(); | |
306 | } | |
0e7d56e3 | 307 | |
1eede070 | 308 | device_power_up(PMSG_RESUME); |
1da177e4 | 309 | Done: |
a53c46dc JB |
310 | arch_suspend_enable_irqs(); |
311 | BUG_ON(irqs_disabled()); | |
1eede070 | 312 | device_pm_unlock(); |
1da177e4 LT |
313 | return error; |
314 | } | |
315 | ||
6c961dfb | 316 | /** |
9628c0ee RW |
317 | * suspend_devices_and_enter - suspend devices and enter the desired system |
318 | * sleep state. | |
6c961dfb RW |
319 | * @state: state to enter |
320 | */ | |
321 | int suspend_devices_and_enter(suspend_state_t state) | |
322 | { | |
cbe2f5a6 | 323 | int error; |
6c961dfb | 324 | |
26398a70 | 325 | if (!suspend_ops) |
6c961dfb RW |
326 | return -ENOSYS; |
327 | ||
c697eece RW |
328 | if (suspend_ops->begin) { |
329 | error = suspend_ops->begin(state); | |
6c961dfb | 330 | if (error) |
c697eece | 331 | goto Close; |
6c961dfb RW |
332 | } |
333 | suspend_console(); | |
77437fd4 | 334 | suspend_test_start(); |
6c961dfb RW |
335 | error = device_suspend(PMSG_SUSPEND); |
336 | if (error) { | |
465d2b47 | 337 | printk(KERN_ERR "PM: Some devices failed to suspend\n"); |
d8f3de0d | 338 | goto Recover_platform; |
6c961dfb | 339 | } |
77437fd4 | 340 | suspend_test_finish("suspend devices"); |
0e7d56e3 | 341 | if (suspend_test(TEST_DEVICES)) |
d8f3de0d | 342 | goto Recover_platform; |
0e7d56e3 | 343 | |
26398a70 | 344 | if (suspend_ops->prepare) { |
e6c5eb95 | 345 | error = suspend_ops->prepare(); |
6c961dfb RW |
346 | if (error) |
347 | goto Resume_devices; | |
348 | } | |
0e7d56e3 RW |
349 | |
350 | if (suspend_test(TEST_PLATFORM)) | |
351 | goto Finish; | |
352 | ||
6c961dfb | 353 | error = disable_nonboot_cpus(); |
0e7d56e3 | 354 | if (!error && !suspend_test(TEST_CPUS)) |
6c961dfb RW |
355 | suspend_enter(state); |
356 | ||
357 | enable_nonboot_cpus(); | |
0e7d56e3 | 358 | Finish: |
e6c5eb95 RW |
359 | if (suspend_ops->finish) |
360 | suspend_ops->finish(); | |
6c961dfb | 361 | Resume_devices: |
77437fd4 | 362 | suspend_test_start(); |
1eede070 | 363 | device_resume(PMSG_RESUME); |
77437fd4 | 364 | suspend_test_finish("resume devices"); |
6c961dfb | 365 | resume_console(); |
c697eece RW |
366 | Close: |
367 | if (suspend_ops->end) | |
368 | suspend_ops->end(); | |
6c961dfb | 369 | return error; |
d8f3de0d RW |
370 | |
371 | Recover_platform: | |
372 | if (suspend_ops->recover) | |
373 | suspend_ops->recover(); | |
374 | goto Resume_devices; | |
6c961dfb | 375 | } |
1da177e4 LT |
376 | |
377 | /** | |
378 | * suspend_finish - Do final work before exiting suspend sequence. | |
1da177e4 LT |
379 | * |
380 | * Call platform code to clean up, restart processes, and free the | |
381 | * console that we've allocated. This is not called for suspend-to-disk. | |
382 | */ | |
6c961dfb | 383 | static void suspend_finish(void) |
1da177e4 | 384 | { |
b28f5081 | 385 | suspend_thaw_processes(); |
1bfcf130 | 386 | usermodehelper_enable(); |
b10d9117 | 387 | pm_notifier_call_chain(PM_POST_SUSPEND); |
af258f51 | 388 | pm_restore_console(); |
1da177e4 LT |
389 | } |
390 | ||
391 | ||
392 | ||
393 | ||
3b364b8d | 394 | static const char * const pm_states[PM_SUSPEND_MAX] = { |
1da177e4 LT |
395 | [PM_SUSPEND_STANDBY] = "standby", |
396 | [PM_SUSPEND_MEM] = "mem", | |
1da177e4 LT |
397 | }; |
398 | ||
123d3c13 PM |
399 | static inline int valid_state(suspend_state_t state) |
400 | { | |
a3d25c27 RW |
401 | /* All states need lowlevel support and need to be valid |
402 | * to the lowlevel implementation, no valid callback | |
9684e51c | 403 | * implies that none are valid. */ |
26398a70 | 404 | if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state)) |
123d3c13 PM |
405 | return 0; |
406 | return 1; | |
407 | } | |
408 | ||
1da177e4 LT |
409 | |
410 | /** | |
411 | * enter_state - Do common work of entering low-power state. | |
412 | * @state: pm_state structure for state we're entering. | |
413 | * | |
414 | * Make sure we're the only ones trying to enter a sleep state. Fail | |
415 | * if someone has beat us to it, since we don't want anything weird to | |
416 | * happen when we wake up. | |
417 | * Then, do the setup for suspend, enter the state, and cleaup (after | |
418 | * we've woken up). | |
419 | */ | |
1da177e4 LT |
420 | static int enter_state(suspend_state_t state) |
421 | { | |
422 | int error; | |
423 | ||
123d3c13 | 424 | if (!valid_state(state)) |
eb9289eb | 425 | return -ENODEV; |
232b1432 | 426 | |
a6d70980 | 427 | if (!mutex_trylock(&pm_mutex)) |
1da177e4 LT |
428 | return -EBUSY; |
429 | ||
465d2b47 | 430 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
431 | sys_sync(); |
432 | printk("done.\n"); | |
433 | ||
82428b62 | 434 | pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); |
0e7d56e3 RW |
435 | error = suspend_prepare(); |
436 | if (error) | |
1da177e4 LT |
437 | goto Unlock; |
438 | ||
0e7d56e3 RW |
439 | if (suspend_test(TEST_FREEZER)) |
440 | goto Finish; | |
441 | ||
82428b62 | 442 | pr_debug("PM: Entering %s sleep\n", pm_states[state]); |
6c961dfb | 443 | error = suspend_devices_and_enter(state); |
1da177e4 | 444 | |
0e7d56e3 | 445 | Finish: |
82428b62 | 446 | pr_debug("PM: Finishing wakeup.\n"); |
6c961dfb | 447 | suspend_finish(); |
1da177e4 | 448 | Unlock: |
a6d70980 | 449 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
450 | return error; |
451 | } | |
452 | ||
1da177e4 LT |
453 | |
454 | /** | |
455 | * pm_suspend - Externally visible function for suspending system. | |
a3d25c27 | 456 | * @state: Enumerated value of state to enter. |
1da177e4 LT |
457 | * |
458 | * Determine whether or not value is within range, get state | |
459 | * structure, and enter (above). | |
460 | */ | |
461 | ||
462 | int pm_suspend(suspend_state_t state) | |
463 | { | |
e2a5b420 | 464 | if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX) |
1da177e4 LT |
465 | return enter_state(state); |
466 | return -EINVAL; | |
467 | } | |
468 | ||
4cf30348 | 469 | EXPORT_SYMBOL(pm_suspend); |
1da177e4 | 470 | |
296699de RW |
471 | #endif /* CONFIG_SUSPEND */ |
472 | ||
d76e15fb | 473 | struct kobject *power_kobj; |
1da177e4 LT |
474 | |
475 | /** | |
476 | * state - control system power state. | |
477 | * | |
478 | * show() returns what states are supported, which is hard-coded to | |
479 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
480 | * 'disk' (Suspend-to-Disk). | |
481 | * | |
482 | * store() accepts one of those strings, translates it into the | |
483 | * proper enumerated value, and initiates a suspend transition. | |
484 | */ | |
485 | ||
386f275f KS |
486 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
487 | char *buf) | |
1da177e4 | 488 | { |
296699de RW |
489 | char *s = buf; |
490 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 491 | int i; |
1da177e4 LT |
492 | |
493 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
494 | if (pm_states[i] && valid_state(i)) |
495 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 496 | } |
296699de | 497 | #endif |
b0cb1a19 | 498 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
499 | s += sprintf(s, "%s\n", "disk"); |
500 | #else | |
501 | if (s != buf) | |
502 | /* convert the last space to a newline */ | |
503 | *(s-1) = '\n'; | |
504 | #endif | |
1da177e4 LT |
505 | return (s - buf); |
506 | } | |
507 | ||
386f275f KS |
508 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
509 | const char *buf, size_t n) | |
1da177e4 | 510 | { |
296699de | 511 | #ifdef CONFIG_SUSPEND |
1da177e4 | 512 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 513 | const char * const *s; |
296699de | 514 | #endif |
1da177e4 | 515 | char *p; |
1da177e4 | 516 | int len; |
296699de | 517 | int error = -EINVAL; |
1da177e4 LT |
518 | |
519 | p = memchr(buf, '\n', n); | |
520 | len = p ? p - buf : n; | |
521 | ||
a3d25c27 | 522 | /* First, check if we are requested to hibernate */ |
8d98a690 | 523 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 524 | error = hibernate(); |
296699de | 525 | goto Exit; |
a3d25c27 RW |
526 | } |
527 | ||
296699de | 528 | #ifdef CONFIG_SUSPEND |
1da177e4 | 529 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 530 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
531 | break; |
532 | } | |
47bb7899 | 533 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 534 | error = enter_state(state); |
296699de RW |
535 | #endif |
536 | ||
537 | Exit: | |
1da177e4 LT |
538 | return error ? error : n; |
539 | } | |
540 | ||
541 | power_attr(state); | |
542 | ||
c5c6ba4e RW |
543 | #ifdef CONFIG_PM_TRACE |
544 | int pm_trace_enabled; | |
545 | ||
386f275f KS |
546 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
547 | char *buf) | |
c5c6ba4e RW |
548 | { |
549 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
550 | } | |
551 | ||
552 | static ssize_t | |
386f275f KS |
553 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
554 | const char *buf, size_t n) | |
c5c6ba4e RW |
555 | { |
556 | int val; | |
557 | ||
558 | if (sscanf(buf, "%d", &val) == 1) { | |
559 | pm_trace_enabled = !!val; | |
560 | return n; | |
561 | } | |
562 | return -EINVAL; | |
563 | } | |
564 | ||
565 | power_attr(pm_trace); | |
0e7d56e3 | 566 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
567 | |
568 | static struct attribute * g[] = { | |
569 | &state_attr.attr, | |
0e7d56e3 | 570 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 571 | &pm_trace_attr.attr, |
0e7d56e3 | 572 | #endif |
7671b8ae | 573 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG) |
0e7d56e3 RW |
574 | &pm_test_attr.attr, |
575 | #endif | |
c5c6ba4e RW |
576 | NULL, |
577 | }; | |
1da177e4 LT |
578 | |
579 | static struct attribute_group attr_group = { | |
580 | .attrs = g, | |
581 | }; | |
582 | ||
583 | ||
584 | static int __init pm_init(void) | |
585 | { | |
d76e15fb GKH |
586 | power_kobj = kobject_create_and_add("power", NULL); |
587 | if (!power_kobj) | |
039a5dcd | 588 | return -ENOMEM; |
d76e15fb | 589 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
590 | } |
591 | ||
592 | core_initcall(pm_init); | |
77437fd4 DB |
593 | |
594 | ||
595 | #ifdef CONFIG_PM_TEST_SUSPEND | |
596 | ||
597 | #include <linux/rtc.h> | |
598 | ||
599 | /* | |
600 | * To test system suspend, we need a hands-off mechanism to resume the | |
601 | * system. RTCs wake alarms are a common self-contained mechanism. | |
602 | */ | |
603 | ||
604 | static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state) | |
605 | { | |
606 | static char err_readtime[] __initdata = | |
607 | KERN_ERR "PM: can't read %s time, err %d\n"; | |
608 | static char err_wakealarm [] __initdata = | |
609 | KERN_ERR "PM: can't set %s wakealarm, err %d\n"; | |
610 | static char err_suspend[] __initdata = | |
611 | KERN_ERR "PM: suspend test failed, error %d\n"; | |
612 | static char info_test[] __initdata = | |
613 | KERN_INFO "PM: test RTC wakeup from '%s' suspend\n"; | |
614 | ||
615 | unsigned long now; | |
616 | struct rtc_wkalrm alm; | |
617 | int status; | |
618 | ||
619 | /* this may fail if the RTC hasn't been initialized */ | |
620 | status = rtc_read_time(rtc, &alm.time); | |
621 | if (status < 0) { | |
81ff86a1 | 622 | printk(err_readtime, dev_name(&rtc->dev), status); |
77437fd4 DB |
623 | return; |
624 | } | |
625 | rtc_tm_to_time(&alm.time, &now); | |
626 | ||
627 | memset(&alm, 0, sizeof alm); | |
628 | rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time); | |
629 | alm.enabled = true; | |
630 | ||
631 | status = rtc_set_alarm(rtc, &alm); | |
632 | if (status < 0) { | |
81ff86a1 | 633 | printk(err_wakealarm, dev_name(&rtc->dev), status); |
77437fd4 DB |
634 | return; |
635 | } | |
636 | ||
637 | if (state == PM_SUSPEND_MEM) { | |
638 | printk(info_test, pm_states[state]); | |
639 | status = pm_suspend(state); | |
640 | if (status == -ENODEV) | |
641 | state = PM_SUSPEND_STANDBY; | |
642 | } | |
643 | if (state == PM_SUSPEND_STANDBY) { | |
644 | printk(info_test, pm_states[state]); | |
645 | status = pm_suspend(state); | |
646 | } | |
647 | if (status < 0) | |
648 | printk(err_suspend, status); | |
a2e2e357 DB |
649 | |
650 | /* Some platforms can't detect that the alarm triggered the | |
651 | * wakeup, or (accordingly) disable it after it afterwards. | |
652 | * It's supposed to give oneshot behavior; cope. | |
653 | */ | |
654 | alm.enabled = false; | |
655 | rtc_set_alarm(rtc, &alm); | |
77437fd4 DB |
656 | } |
657 | ||
658 | static int __init has_wakealarm(struct device *dev, void *name_ptr) | |
659 | { | |
660 | struct rtc_device *candidate = to_rtc_device(dev); | |
661 | ||
662 | if (!candidate->ops->set_alarm) | |
663 | return 0; | |
664 | if (!device_may_wakeup(candidate->dev.parent)) | |
665 | return 0; | |
666 | ||
81ff86a1 | 667 | *(const char **)name_ptr = dev_name(dev); |
77437fd4 DB |
668 | return 1; |
669 | } | |
670 | ||
671 | /* | |
672 | * Kernel options like "test_suspend=mem" force suspend/resume sanity tests | |
673 | * at startup time. They're normally disabled, for faster boot and because | |
674 | * we can't know which states really work on this particular system. | |
675 | */ | |
676 | static suspend_state_t test_state __initdata = PM_SUSPEND_ON; | |
677 | ||
678 | static char warn_bad_state[] __initdata = | |
679 | KERN_WARNING "PM: can't test '%s' suspend state\n"; | |
680 | ||
681 | static int __init setup_test_suspend(char *value) | |
682 | { | |
683 | unsigned i; | |
684 | ||
685 | /* "=mem" ==> "mem" */ | |
686 | value++; | |
687 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
688 | if (!pm_states[i]) | |
689 | continue; | |
690 | if (strcmp(pm_states[i], value) != 0) | |
691 | continue; | |
692 | test_state = (__force suspend_state_t) i; | |
693 | return 0; | |
694 | } | |
695 | printk(warn_bad_state, value); | |
696 | return 0; | |
697 | } | |
698 | __setup("test_suspend", setup_test_suspend); | |
699 | ||
700 | static int __init test_suspend(void) | |
701 | { | |
702 | static char warn_no_rtc[] __initdata = | |
703 | KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n"; | |
704 | ||
705 | char *pony = NULL; | |
706 | struct rtc_device *rtc = NULL; | |
707 | ||
708 | /* PM is initialized by now; is that state testable? */ | |
709 | if (test_state == PM_SUSPEND_ON) | |
710 | goto done; | |
711 | if (!valid_state(test_state)) { | |
712 | printk(warn_bad_state, pm_states[test_state]); | |
713 | goto done; | |
714 | } | |
715 | ||
716 | /* RTCs have initialized by now too ... can we use one? */ | |
717 | class_find_device(rtc_class, NULL, &pony, has_wakealarm); | |
718 | if (pony) | |
719 | rtc = rtc_class_open(pony); | |
720 | if (!rtc) { | |
721 | printk(warn_no_rtc); | |
722 | goto done; | |
723 | } | |
724 | ||
725 | /* go for it */ | |
726 | test_wakealarm(rtc, test_state); | |
727 | rtc_class_close(rtc); | |
728 | done: | |
729 | return 0; | |
730 | } | |
731 | late_initcall(test_suspend); | |
732 | ||
733 | #endif /* CONFIG_PM_TEST_SUSPEND */ |