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> | |
17 | #include <linux/init.h> | |
6cc07191 | 18 | #include <linux/console.h> |
e3920fb4 | 19 | #include <linux/cpu.h> |
c5c6ba4e | 20 | #include <linux/resume-trace.h> |
7dfb7103 | 21 | #include <linux/freezer.h> |
96177299 | 22 | #include <linux/vmstat.h> |
232b1432 | 23 | #include <linux/syscalls.h> |
1da177e4 LT |
24 | |
25 | #include "power.h" | |
26 | ||
a6d70980 | 27 | DEFINE_MUTEX(pm_mutex); |
1da177e4 | 28 | |
9f9adecd LB |
29 | unsigned int pm_flags; |
30 | EXPORT_SYMBOL(pm_flags); | |
31 | ||
82525756 AS |
32 | #ifdef CONFIG_PM_SLEEP |
33 | ||
34 | /* Routines for PM-transition notifications */ | |
35 | ||
36 | static BLOCKING_NOTIFIER_HEAD(pm_chain_head); | |
37 | ||
38 | int register_pm_notifier(struct notifier_block *nb) | |
39 | { | |
40 | return blocking_notifier_chain_register(&pm_chain_head, nb); | |
41 | } | |
42 | EXPORT_SYMBOL_GPL(register_pm_notifier); | |
43 | ||
44 | int unregister_pm_notifier(struct notifier_block *nb) | |
45 | { | |
46 | return blocking_notifier_chain_unregister(&pm_chain_head, nb); | |
47 | } | |
48 | EXPORT_SYMBOL_GPL(unregister_pm_notifier); | |
49 | ||
50 | int pm_notifier_call_chain(unsigned long val) | |
51 | { | |
52 | return (blocking_notifier_call_chain(&pm_chain_head, val, NULL) | |
53 | == NOTIFY_BAD) ? -EINVAL : 0; | |
54 | } | |
55 | ||
0e7d56e3 RW |
56 | #ifdef CONFIG_PM_DEBUG |
57 | int pm_test_level = TEST_NONE; | |
58 | ||
59 | static int suspend_test(int level) | |
60 | { | |
61 | if (pm_test_level == level) { | |
62 | printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n"); | |
63 | mdelay(5000); | |
64 | return 1; | |
65 | } | |
66 | return 0; | |
67 | } | |
68 | ||
69 | static const char * const pm_tests[__TEST_AFTER_LAST] = { | |
70 | [TEST_NONE] = "none", | |
71 | [TEST_CORE] = "core", | |
72 | [TEST_CPUS] = "processors", | |
73 | [TEST_PLATFORM] = "platform", | |
74 | [TEST_DEVICES] = "devices", | |
75 | [TEST_FREEZER] = "freezer", | |
76 | }; | |
77 | ||
039a75c6 RW |
78 | static ssize_t pm_test_show(struct kobject *kobj, struct kobj_attribute *attr, |
79 | char *buf) | |
0e7d56e3 RW |
80 | { |
81 | char *s = buf; | |
82 | int level; | |
83 | ||
84 | for (level = TEST_FIRST; level <= TEST_MAX; level++) | |
85 | if (pm_tests[level]) { | |
86 | if (level == pm_test_level) | |
87 | s += sprintf(s, "[%s] ", pm_tests[level]); | |
88 | else | |
89 | s += sprintf(s, "%s ", pm_tests[level]); | |
90 | } | |
91 | ||
92 | if (s != buf) | |
93 | /* convert the last space to a newline */ | |
94 | *(s-1) = '\n'; | |
95 | ||
96 | return (s - buf); | |
97 | } | |
98 | ||
039a75c6 RW |
99 | static ssize_t pm_test_store(struct kobject *kobj, struct kobj_attribute *attr, |
100 | const char *buf, size_t n) | |
0e7d56e3 RW |
101 | { |
102 | const char * const *s; | |
103 | int level; | |
104 | char *p; | |
105 | int len; | |
106 | int error = -EINVAL; | |
107 | ||
108 | p = memchr(buf, '\n', n); | |
109 | len = p ? p - buf : n; | |
110 | ||
111 | mutex_lock(&pm_mutex); | |
112 | ||
113 | level = TEST_FIRST; | |
114 | for (s = &pm_tests[level]; level <= TEST_MAX; s++, level++) | |
115 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) { | |
116 | pm_test_level = level; | |
117 | error = 0; | |
118 | break; | |
119 | } | |
120 | ||
121 | mutex_unlock(&pm_mutex); | |
122 | ||
123 | return error ? error : n; | |
124 | } | |
125 | ||
126 | power_attr(pm_test); | |
127 | #else /* !CONFIG_PM_DEBUG */ | |
128 | static inline int suspend_test(int level) { return 0; } | |
129 | #endif /* !CONFIG_PM_DEBUG */ | |
130 | ||
7671b8ae | 131 | #endif /* CONFIG_PM_SLEEP */ |
039a75c6 | 132 | |
296699de RW |
133 | #ifdef CONFIG_SUSPEND |
134 | ||
77437fd4 DB |
135 | #ifdef CONFIG_PM_TEST_SUSPEND |
136 | ||
137 | /* | |
138 | * We test the system suspend code by setting an RTC wakealarm a short | |
139 | * time in the future, then suspending. Suspending the devices won't | |
140 | * normally take long ... some systems only need a few milliseconds. | |
141 | * | |
142 | * The time it takes is system-specific though, so when we test this | |
143 | * during system bootup we allow a LOT of time. | |
144 | */ | |
145 | #define TEST_SUSPEND_SECONDS 5 | |
146 | ||
147 | static unsigned long suspend_test_start_time; | |
148 | ||
149 | static void suspend_test_start(void) | |
150 | { | |
151 | /* FIXME Use better timebase than "jiffies", ideally a clocksource. | |
152 | * What we want is a hardware counter that will work correctly even | |
153 | * during the irqs-are-off stages of the suspend/resume cycle... | |
154 | */ | |
155 | suspend_test_start_time = jiffies; | |
156 | } | |
157 | ||
158 | static void suspend_test_finish(const char *label) | |
159 | { | |
160 | long nj = jiffies - suspend_test_start_time; | |
161 | unsigned msec; | |
162 | ||
163 | msec = jiffies_to_msecs(abs(nj)); | |
164 | pr_info("PM: %s took %d.%03d seconds\n", label, | |
165 | msec / 1000, msec % 1000); | |
166 | ||
167 | /* Warning on suspend means the RTC alarm period needs to be | |
168 | * larger -- the system was sooo slooowwww to suspend that the | |
169 | * alarm (should have) fired before the system went to sleep! | |
170 | * | |
171 | * Warning on either suspend or resume also means the system | |
172 | * has some performance issues. The stack dump of a WARN_ON | |
173 | * is more likely to get the right attention than a printk... | |
174 | */ | |
175 | WARN_ON(msec > (TEST_SUSPEND_SECONDS * 1000)); | |
176 | } | |
177 | ||
178 | #else | |
179 | ||
180 | static void suspend_test_start(void) | |
181 | { | |
182 | } | |
183 | ||
184 | static void suspend_test_finish(const char *label) | |
185 | { | |
186 | } | |
187 | ||
188 | #endif | |
189 | ||
296699de RW |
190 | /* This is just an arbitrary number */ |
191 | #define FREE_PAGE_NUMBER (100) | |
192 | ||
f242d919 | 193 | static struct platform_suspend_ops *suspend_ops; |
1da177e4 LT |
194 | |
195 | /** | |
26398a70 | 196 | * suspend_set_ops - Set the global suspend method table. |
1da177e4 LT |
197 | * @ops: Pointer to ops structure. |
198 | */ | |
199 | ||
26398a70 | 200 | void suspend_set_ops(struct platform_suspend_ops *ops) |
1da177e4 | 201 | { |
a6d70980 | 202 | mutex_lock(&pm_mutex); |
26398a70 | 203 | suspend_ops = ops; |
a6d70980 | 204 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
205 | } |
206 | ||
e8c9c502 | 207 | /** |
26398a70 | 208 | * suspend_valid_only_mem - generic memory-only valid callback |
e8c9c502 | 209 | * |
26398a70 | 210 | * Platform drivers that implement mem suspend only and only need |
e8c9c502 JB |
211 | * to check for that in their .valid callback can use this instead |
212 | * of rolling their own .valid callback. | |
213 | */ | |
26398a70 | 214 | int suspend_valid_only_mem(suspend_state_t state) |
e8c9c502 JB |
215 | { |
216 | return state == PM_SUSPEND_MEM; | |
217 | } | |
218 | ||
1da177e4 LT |
219 | /** |
220 | * suspend_prepare - Do prep work before entering low-power state. | |
1da177e4 | 221 | * |
6c961dfb RW |
222 | * This is common code that is called for each state that we're entering. |
223 | * Run suspend notifiers, allocate a console and stop all processes. | |
1da177e4 | 224 | */ |
6c961dfb | 225 | static int suspend_prepare(void) |
1da177e4 | 226 | { |
e3920fb4 | 227 | int error; |
5ae947ec | 228 | unsigned int free_pages; |
1da177e4 | 229 | |
26398a70 | 230 | if (!suspend_ops || !suspend_ops->enter) |
1da177e4 LT |
231 | return -EPERM; |
232 | ||
af258f51 JB |
233 | pm_prepare_console(); |
234 | ||
b10d9117 RW |
235 | error = pm_notifier_call_chain(PM_SUSPEND_PREPARE); |
236 | if (error) | |
237 | goto Finish; | |
238 | ||
b28f5081 | 239 | if (suspend_freeze_processes()) { |
1da177e4 LT |
240 | error = -EAGAIN; |
241 | goto Thaw; | |
242 | } | |
243 | ||
6c961dfb RW |
244 | free_pages = global_page_state(NR_FREE_PAGES); |
245 | if (free_pages < FREE_PAGE_NUMBER) { | |
5ae947ec DSL |
246 | pr_debug("PM: free some memory\n"); |
247 | shrink_all_memory(FREE_PAGE_NUMBER - free_pages); | |
248 | if (nr_free_pages() < FREE_PAGE_NUMBER) { | |
249 | error = -ENOMEM; | |
250 | printk(KERN_ERR "PM: No enough memory\n"); | |
5ae947ec DSL |
251 | } |
252 | } | |
e3c7db62 RW |
253 | if (!error) |
254 | return 0; | |
255 | ||
1da177e4 | 256 | Thaw: |
b28f5081 | 257 | suspend_thaw_processes(); |
b10d9117 RW |
258 | Finish: |
259 | pm_notifier_call_chain(PM_POST_SUSPEND); | |
af258f51 | 260 | pm_restore_console(); |
1da177e4 LT |
261 | return error; |
262 | } | |
263 | ||
a53c46dc JB |
264 | /* default implementation */ |
265 | void __attribute__ ((weak)) arch_suspend_disable_irqs(void) | |
266 | { | |
267 | local_irq_disable(); | |
268 | } | |
269 | ||
270 | /* default implementation */ | |
271 | void __attribute__ ((weak)) arch_suspend_enable_irqs(void) | |
272 | { | |
273 | local_irq_enable(); | |
274 | } | |
1da177e4 | 275 | |
6c961dfb RW |
276 | /** |
277 | * suspend_enter - enter the desired system sleep state. | |
278 | * @state: state to enter | |
279 | * | |
280 | * This function should be called after devices have been suspended. | |
281 | */ | |
a065c86e | 282 | static int suspend_enter(suspend_state_t state) |
1da177e4 LT |
283 | { |
284 | int error = 0; | |
1da177e4 | 285 | |
1eede070 | 286 | device_pm_lock(); |
a53c46dc JB |
287 | arch_suspend_disable_irqs(); |
288 | BUG_ON(!irqs_disabled()); | |
1da177e4 LT |
289 | |
290 | if ((error = device_power_down(PMSG_SUSPEND))) { | |
465d2b47 | 291 | printk(KERN_ERR "PM: Some devices failed to power down\n"); |
1da177e4 LT |
292 | goto Done; |
293 | } | |
0e7d56e3 RW |
294 | |
295 | if (!suspend_test(TEST_CORE)) | |
296 | error = suspend_ops->enter(state); | |
297 | ||
1eede070 | 298 | device_power_up(PMSG_RESUME); |
1da177e4 | 299 | Done: |
a53c46dc JB |
300 | arch_suspend_enable_irqs(); |
301 | BUG_ON(irqs_disabled()); | |
1eede070 | 302 | device_pm_unlock(); |
1da177e4 LT |
303 | return error; |
304 | } | |
305 | ||
6c961dfb | 306 | /** |
9628c0ee RW |
307 | * suspend_devices_and_enter - suspend devices and enter the desired system |
308 | * sleep state. | |
6c961dfb RW |
309 | * @state: state to enter |
310 | */ | |
311 | int suspend_devices_and_enter(suspend_state_t state) | |
312 | { | |
313 | int error; | |
314 | ||
26398a70 | 315 | if (!suspend_ops) |
6c961dfb RW |
316 | return -ENOSYS; |
317 | ||
c697eece RW |
318 | if (suspend_ops->begin) { |
319 | error = suspend_ops->begin(state); | |
6c961dfb | 320 | if (error) |
c697eece | 321 | goto Close; |
6c961dfb RW |
322 | } |
323 | suspend_console(); | |
77437fd4 | 324 | suspend_test_start(); |
6c961dfb RW |
325 | error = device_suspend(PMSG_SUSPEND); |
326 | if (error) { | |
465d2b47 | 327 | printk(KERN_ERR "PM: Some devices failed to suspend\n"); |
d8f3de0d | 328 | goto Recover_platform; |
6c961dfb | 329 | } |
77437fd4 | 330 | suspend_test_finish("suspend devices"); |
0e7d56e3 | 331 | if (suspend_test(TEST_DEVICES)) |
d8f3de0d | 332 | goto Recover_platform; |
0e7d56e3 | 333 | |
26398a70 | 334 | if (suspend_ops->prepare) { |
e6c5eb95 | 335 | error = suspend_ops->prepare(); |
6c961dfb RW |
336 | if (error) |
337 | goto Resume_devices; | |
338 | } | |
0e7d56e3 RW |
339 | |
340 | if (suspend_test(TEST_PLATFORM)) | |
341 | goto Finish; | |
342 | ||
6c961dfb | 343 | error = disable_nonboot_cpus(); |
0e7d56e3 | 344 | if (!error && !suspend_test(TEST_CPUS)) |
6c961dfb RW |
345 | suspend_enter(state); |
346 | ||
347 | enable_nonboot_cpus(); | |
0e7d56e3 | 348 | Finish: |
e6c5eb95 RW |
349 | if (suspend_ops->finish) |
350 | suspend_ops->finish(); | |
6c961dfb | 351 | Resume_devices: |
77437fd4 | 352 | suspend_test_start(); |
1eede070 | 353 | device_resume(PMSG_RESUME); |
77437fd4 | 354 | suspend_test_finish("resume devices"); |
6c961dfb | 355 | resume_console(); |
c697eece RW |
356 | Close: |
357 | if (suspend_ops->end) | |
358 | suspend_ops->end(); | |
6c961dfb | 359 | return error; |
d8f3de0d RW |
360 | |
361 | Recover_platform: | |
362 | if (suspend_ops->recover) | |
363 | suspend_ops->recover(); | |
364 | goto Resume_devices; | |
6c961dfb | 365 | } |
1da177e4 LT |
366 | |
367 | /** | |
368 | * suspend_finish - Do final work before exiting suspend sequence. | |
1da177e4 LT |
369 | * |
370 | * Call platform code to clean up, restart processes, and free the | |
371 | * console that we've allocated. This is not called for suspend-to-disk. | |
372 | */ | |
6c961dfb | 373 | static void suspend_finish(void) |
1da177e4 | 374 | { |
b28f5081 | 375 | suspend_thaw_processes(); |
b10d9117 | 376 | pm_notifier_call_chain(PM_POST_SUSPEND); |
af258f51 | 377 | pm_restore_console(); |
1da177e4 LT |
378 | } |
379 | ||
380 | ||
381 | ||
382 | ||
3b364b8d | 383 | static const char * const pm_states[PM_SUSPEND_MAX] = { |
1da177e4 LT |
384 | [PM_SUSPEND_STANDBY] = "standby", |
385 | [PM_SUSPEND_MEM] = "mem", | |
1da177e4 LT |
386 | }; |
387 | ||
123d3c13 PM |
388 | static inline int valid_state(suspend_state_t state) |
389 | { | |
a3d25c27 RW |
390 | /* All states need lowlevel support and need to be valid |
391 | * to the lowlevel implementation, no valid callback | |
9684e51c | 392 | * implies that none are valid. */ |
26398a70 | 393 | if (!suspend_ops || !suspend_ops->valid || !suspend_ops->valid(state)) |
123d3c13 PM |
394 | return 0; |
395 | return 1; | |
396 | } | |
397 | ||
1da177e4 LT |
398 | |
399 | /** | |
400 | * enter_state - Do common work of entering low-power state. | |
401 | * @state: pm_state structure for state we're entering. | |
402 | * | |
403 | * Make sure we're the only ones trying to enter a sleep state. Fail | |
404 | * if someone has beat us to it, since we don't want anything weird to | |
405 | * happen when we wake up. | |
406 | * Then, do the setup for suspend, enter the state, and cleaup (after | |
407 | * we've woken up). | |
408 | */ | |
1da177e4 LT |
409 | static int enter_state(suspend_state_t state) |
410 | { | |
411 | int error; | |
412 | ||
123d3c13 | 413 | if (!valid_state(state)) |
eb9289eb | 414 | return -ENODEV; |
232b1432 | 415 | |
a6d70980 | 416 | if (!mutex_trylock(&pm_mutex)) |
1da177e4 LT |
417 | return -EBUSY; |
418 | ||
465d2b47 | 419 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
232b1432 RW |
420 | sys_sync(); |
421 | printk("done.\n"); | |
422 | ||
82428b62 | 423 | pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); |
0e7d56e3 RW |
424 | error = suspend_prepare(); |
425 | if (error) | |
1da177e4 LT |
426 | goto Unlock; |
427 | ||
0e7d56e3 RW |
428 | if (suspend_test(TEST_FREEZER)) |
429 | goto Finish; | |
430 | ||
82428b62 | 431 | pr_debug("PM: Entering %s sleep\n", pm_states[state]); |
6c961dfb | 432 | error = suspend_devices_and_enter(state); |
1da177e4 | 433 | |
0e7d56e3 | 434 | Finish: |
82428b62 | 435 | pr_debug("PM: Finishing wakeup.\n"); |
6c961dfb | 436 | suspend_finish(); |
1da177e4 | 437 | Unlock: |
a6d70980 | 438 | mutex_unlock(&pm_mutex); |
1da177e4 LT |
439 | return error; |
440 | } | |
441 | ||
1da177e4 LT |
442 | |
443 | /** | |
444 | * pm_suspend - Externally visible function for suspending system. | |
a3d25c27 | 445 | * @state: Enumerated value of state to enter. |
1da177e4 LT |
446 | * |
447 | * Determine whether or not value is within range, get state | |
448 | * structure, and enter (above). | |
449 | */ | |
450 | ||
451 | int pm_suspend(suspend_state_t state) | |
452 | { | |
e2a5b420 | 453 | if (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX) |
1da177e4 LT |
454 | return enter_state(state); |
455 | return -EINVAL; | |
456 | } | |
457 | ||
4cf30348 | 458 | EXPORT_SYMBOL(pm_suspend); |
1da177e4 | 459 | |
296699de RW |
460 | #endif /* CONFIG_SUSPEND */ |
461 | ||
d76e15fb | 462 | struct kobject *power_kobj; |
1da177e4 LT |
463 | |
464 | /** | |
465 | * state - control system power state. | |
466 | * | |
467 | * show() returns what states are supported, which is hard-coded to | |
468 | * 'standby' (Power-On Suspend), 'mem' (Suspend-to-RAM), and | |
469 | * 'disk' (Suspend-to-Disk). | |
470 | * | |
471 | * store() accepts one of those strings, translates it into the | |
472 | * proper enumerated value, and initiates a suspend transition. | |
473 | */ | |
474 | ||
386f275f KS |
475 | static ssize_t state_show(struct kobject *kobj, struct kobj_attribute *attr, |
476 | char *buf) | |
1da177e4 | 477 | { |
296699de RW |
478 | char *s = buf; |
479 | #ifdef CONFIG_SUSPEND | |
1da177e4 | 480 | int i; |
1da177e4 LT |
481 | |
482 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
123d3c13 PM |
483 | if (pm_states[i] && valid_state(i)) |
484 | s += sprintf(s,"%s ", pm_states[i]); | |
1da177e4 | 485 | } |
296699de | 486 | #endif |
b0cb1a19 | 487 | #ifdef CONFIG_HIBERNATION |
a3d25c27 RW |
488 | s += sprintf(s, "%s\n", "disk"); |
489 | #else | |
490 | if (s != buf) | |
491 | /* convert the last space to a newline */ | |
492 | *(s-1) = '\n'; | |
493 | #endif | |
1da177e4 LT |
494 | return (s - buf); |
495 | } | |
496 | ||
386f275f KS |
497 | static ssize_t state_store(struct kobject *kobj, struct kobj_attribute *attr, |
498 | const char *buf, size_t n) | |
1da177e4 | 499 | { |
296699de | 500 | #ifdef CONFIG_SUSPEND |
1da177e4 | 501 | suspend_state_t state = PM_SUSPEND_STANDBY; |
3b364b8d | 502 | const char * const *s; |
296699de | 503 | #endif |
1da177e4 | 504 | char *p; |
1da177e4 | 505 | int len; |
296699de | 506 | int error = -EINVAL; |
1da177e4 LT |
507 | |
508 | p = memchr(buf, '\n', n); | |
509 | len = p ? p - buf : n; | |
510 | ||
a3d25c27 | 511 | /* First, check if we are requested to hibernate */ |
8d98a690 | 512 | if (len == 4 && !strncmp(buf, "disk", len)) { |
a3d25c27 | 513 | error = hibernate(); |
296699de | 514 | goto Exit; |
a3d25c27 RW |
515 | } |
516 | ||
296699de | 517 | #ifdef CONFIG_SUSPEND |
1da177e4 | 518 | for (s = &pm_states[state]; state < PM_SUSPEND_MAX; s++, state++) { |
8d98a690 | 519 | if (*s && len == strlen(*s) && !strncmp(buf, *s, len)) |
1da177e4 LT |
520 | break; |
521 | } | |
47bb7899 | 522 | if (state < PM_SUSPEND_MAX && *s) |
1da177e4 | 523 | error = enter_state(state); |
296699de RW |
524 | #endif |
525 | ||
526 | Exit: | |
1da177e4 LT |
527 | return error ? error : n; |
528 | } | |
529 | ||
530 | power_attr(state); | |
531 | ||
c5c6ba4e RW |
532 | #ifdef CONFIG_PM_TRACE |
533 | int pm_trace_enabled; | |
534 | ||
386f275f KS |
535 | static ssize_t pm_trace_show(struct kobject *kobj, struct kobj_attribute *attr, |
536 | char *buf) | |
c5c6ba4e RW |
537 | { |
538 | return sprintf(buf, "%d\n", pm_trace_enabled); | |
539 | } | |
540 | ||
541 | static ssize_t | |
386f275f KS |
542 | pm_trace_store(struct kobject *kobj, struct kobj_attribute *attr, |
543 | const char *buf, size_t n) | |
c5c6ba4e RW |
544 | { |
545 | int val; | |
546 | ||
547 | if (sscanf(buf, "%d", &val) == 1) { | |
548 | pm_trace_enabled = !!val; | |
549 | return n; | |
550 | } | |
551 | return -EINVAL; | |
552 | } | |
553 | ||
554 | power_attr(pm_trace); | |
0e7d56e3 | 555 | #endif /* CONFIG_PM_TRACE */ |
c5c6ba4e RW |
556 | |
557 | static struct attribute * g[] = { | |
558 | &state_attr.attr, | |
0e7d56e3 | 559 | #ifdef CONFIG_PM_TRACE |
c5c6ba4e | 560 | &pm_trace_attr.attr, |
0e7d56e3 | 561 | #endif |
7671b8ae | 562 | #if defined(CONFIG_PM_SLEEP) && defined(CONFIG_PM_DEBUG) |
0e7d56e3 RW |
563 | &pm_test_attr.attr, |
564 | #endif | |
c5c6ba4e RW |
565 | NULL, |
566 | }; | |
1da177e4 LT |
567 | |
568 | static struct attribute_group attr_group = { | |
569 | .attrs = g, | |
570 | }; | |
571 | ||
572 | ||
573 | static int __init pm_init(void) | |
574 | { | |
d76e15fb GKH |
575 | power_kobj = kobject_create_and_add("power", NULL); |
576 | if (!power_kobj) | |
039a5dcd | 577 | return -ENOMEM; |
d76e15fb | 578 | return sysfs_create_group(power_kobj, &attr_group); |
1da177e4 LT |
579 | } |
580 | ||
581 | core_initcall(pm_init); | |
77437fd4 DB |
582 | |
583 | ||
584 | #ifdef CONFIG_PM_TEST_SUSPEND | |
585 | ||
586 | #include <linux/rtc.h> | |
587 | ||
588 | /* | |
589 | * To test system suspend, we need a hands-off mechanism to resume the | |
590 | * system. RTCs wake alarms are a common self-contained mechanism. | |
591 | */ | |
592 | ||
593 | static void __init test_wakealarm(struct rtc_device *rtc, suspend_state_t state) | |
594 | { | |
595 | static char err_readtime[] __initdata = | |
596 | KERN_ERR "PM: can't read %s time, err %d\n"; | |
597 | static char err_wakealarm [] __initdata = | |
598 | KERN_ERR "PM: can't set %s wakealarm, err %d\n"; | |
599 | static char err_suspend[] __initdata = | |
600 | KERN_ERR "PM: suspend test failed, error %d\n"; | |
601 | static char info_test[] __initdata = | |
602 | KERN_INFO "PM: test RTC wakeup from '%s' suspend\n"; | |
603 | ||
604 | unsigned long now; | |
605 | struct rtc_wkalrm alm; | |
606 | int status; | |
607 | ||
608 | /* this may fail if the RTC hasn't been initialized */ | |
609 | status = rtc_read_time(rtc, &alm.time); | |
610 | if (status < 0) { | |
611 | printk(err_readtime, rtc->dev.bus_id, status); | |
612 | return; | |
613 | } | |
614 | rtc_tm_to_time(&alm.time, &now); | |
615 | ||
616 | memset(&alm, 0, sizeof alm); | |
617 | rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time); | |
618 | alm.enabled = true; | |
619 | ||
620 | status = rtc_set_alarm(rtc, &alm); | |
621 | if (status < 0) { | |
622 | printk(err_wakealarm, rtc->dev.bus_id, status); | |
623 | return; | |
624 | } | |
625 | ||
626 | if (state == PM_SUSPEND_MEM) { | |
627 | printk(info_test, pm_states[state]); | |
628 | status = pm_suspend(state); | |
629 | if (status == -ENODEV) | |
630 | state = PM_SUSPEND_STANDBY; | |
631 | } | |
632 | if (state == PM_SUSPEND_STANDBY) { | |
633 | printk(info_test, pm_states[state]); | |
634 | status = pm_suspend(state); | |
635 | } | |
636 | if (status < 0) | |
637 | printk(err_suspend, status); | |
a2e2e357 DB |
638 | |
639 | /* Some platforms can't detect that the alarm triggered the | |
640 | * wakeup, or (accordingly) disable it after it afterwards. | |
641 | * It's supposed to give oneshot behavior; cope. | |
642 | */ | |
643 | alm.enabled = false; | |
644 | rtc_set_alarm(rtc, &alm); | |
77437fd4 DB |
645 | } |
646 | ||
647 | static int __init has_wakealarm(struct device *dev, void *name_ptr) | |
648 | { | |
649 | struct rtc_device *candidate = to_rtc_device(dev); | |
650 | ||
651 | if (!candidate->ops->set_alarm) | |
652 | return 0; | |
653 | if (!device_may_wakeup(candidate->dev.parent)) | |
654 | return 0; | |
655 | ||
656 | *(char **)name_ptr = dev->bus_id; | |
657 | return 1; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Kernel options like "test_suspend=mem" force suspend/resume sanity tests | |
662 | * at startup time. They're normally disabled, for faster boot and because | |
663 | * we can't know which states really work on this particular system. | |
664 | */ | |
665 | static suspend_state_t test_state __initdata = PM_SUSPEND_ON; | |
666 | ||
667 | static char warn_bad_state[] __initdata = | |
668 | KERN_WARNING "PM: can't test '%s' suspend state\n"; | |
669 | ||
670 | static int __init setup_test_suspend(char *value) | |
671 | { | |
672 | unsigned i; | |
673 | ||
674 | /* "=mem" ==> "mem" */ | |
675 | value++; | |
676 | for (i = 0; i < PM_SUSPEND_MAX; i++) { | |
677 | if (!pm_states[i]) | |
678 | continue; | |
679 | if (strcmp(pm_states[i], value) != 0) | |
680 | continue; | |
681 | test_state = (__force suspend_state_t) i; | |
682 | return 0; | |
683 | } | |
684 | printk(warn_bad_state, value); | |
685 | return 0; | |
686 | } | |
687 | __setup("test_suspend", setup_test_suspend); | |
688 | ||
689 | static int __init test_suspend(void) | |
690 | { | |
691 | static char warn_no_rtc[] __initdata = | |
692 | KERN_WARNING "PM: no wakealarm-capable RTC driver is ready\n"; | |
693 | ||
694 | char *pony = NULL; | |
695 | struct rtc_device *rtc = NULL; | |
696 | ||
697 | /* PM is initialized by now; is that state testable? */ | |
698 | if (test_state == PM_SUSPEND_ON) | |
699 | goto done; | |
700 | if (!valid_state(test_state)) { | |
701 | printk(warn_bad_state, pm_states[test_state]); | |
702 | goto done; | |
703 | } | |
704 | ||
705 | /* RTCs have initialized by now too ... can we use one? */ | |
706 | class_find_device(rtc_class, NULL, &pony, has_wakealarm); | |
707 | if (pony) | |
708 | rtc = rtc_class_open(pony); | |
709 | if (!rtc) { | |
710 | printk(warn_no_rtc); | |
711 | goto done; | |
712 | } | |
713 | ||
714 | /* go for it */ | |
715 | test_wakealarm(rtc, test_state); | |
716 | rtc_class_close(rtc); | |
717 | done: | |
718 | return 0; | |
719 | } | |
720 | late_initcall(test_suspend); | |
721 | ||
722 | #endif /* CONFIG_PM_TEST_SUSPEND */ |