]>
Commit | Line | Data |
---|---|---|
a9d70523 RW |
1 | /* |
2 | * kernel/power/suspend.c - Suspend to RAM and standby functionality. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | */ | |
10 | ||
11 | #include <linux/string.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/errno.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/console.h> | |
16 | #include <linux/cpu.h> | |
f3f12532 | 17 | #include <linux/cpuidle.h> |
a9d70523 | 18 | #include <linux/syscalls.h> |
5a0e3ad6 | 19 | #include <linux/gfp.h> |
dd4c4f17 MG |
20 | #include <linux/io.h> |
21 | #include <linux/kernel.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/slab.h> | |
6e5fdeed | 25 | #include <linux/export.h> |
dd4c4f17 | 26 | #include <linux/suspend.h> |
40dc166c | 27 | #include <linux/syscore_ops.h> |
443772d4 | 28 | #include <linux/ftrace.h> |
938cfed1 | 29 | #include <trace/events/power.h> |
52f5684c | 30 | #include <linux/compiler.h> |
a9d70523 RW |
31 | |
32 | #include "power.h" | |
33 | ||
62109b43 | 34 | const char *pm_labels[] = { "mem", "standby", "freeze", NULL }; |
d431cbc5 | 35 | const char *pm_states[PM_SUSPEND_MAX]; |
a9d70523 | 36 | |
2f55ac07 | 37 | static const struct platform_suspend_ops *suspend_ops; |
1f0b6386 | 38 | static const struct platform_freeze_ops *freeze_ops; |
7e73c5ae | 39 | static DECLARE_WAIT_QUEUE_HEAD(suspend_freeze_wait_head); |
38106313 RW |
40 | |
41 | enum freeze_state __read_mostly suspend_freeze_state; | |
42 | static DEFINE_SPINLOCK(suspend_freeze_lock); | |
7e73c5ae | 43 | |
1f0b6386 RW |
44 | void freeze_set_ops(const struct platform_freeze_ops *ops) |
45 | { | |
46 | lock_system_sleep(); | |
47 | freeze_ops = ops; | |
48 | unlock_system_sleep(); | |
49 | } | |
50 | ||
7e73c5ae ZR |
51 | static void freeze_begin(void) |
52 | { | |
38106313 | 53 | suspend_freeze_state = FREEZE_STATE_NONE; |
7e73c5ae ZR |
54 | } |
55 | ||
56 | static void freeze_enter(void) | |
57 | { | |
38106313 RW |
58 | spin_lock_irq(&suspend_freeze_lock); |
59 | if (pm_wakeup_pending()) | |
60 | goto out; | |
61 | ||
62 | suspend_freeze_state = FREEZE_STATE_ENTER; | |
63 | spin_unlock_irq(&suspend_freeze_lock); | |
64 | ||
65 | get_online_cpus(); | |
f3f12532 | 66 | cpuidle_resume(); |
38106313 RW |
67 | |
68 | /* Push all the CPUs into the idle loop. */ | |
69 | wake_up_all_idle_cpus(); | |
70 | pr_debug("PM: suspend-to-idle\n"); | |
71 | /* Make the current CPU wait so it can enter the idle loop too. */ | |
72 | wait_event(suspend_freeze_wait_head, | |
73 | suspend_freeze_state == FREEZE_STATE_WAKE); | |
74 | pr_debug("PM: resume from suspend-to-idle\n"); | |
75 | ||
f3f12532 | 76 | cpuidle_pause(); |
38106313 RW |
77 | put_online_cpus(); |
78 | ||
79 | spin_lock_irq(&suspend_freeze_lock); | |
80 | ||
81 | out: | |
82 | suspend_freeze_state = FREEZE_STATE_NONE; | |
83 | spin_unlock_irq(&suspend_freeze_lock); | |
7e73c5ae ZR |
84 | } |
85 | ||
86 | void freeze_wake(void) | |
87 | { | |
38106313 RW |
88 | unsigned long flags; |
89 | ||
90 | spin_lock_irqsave(&suspend_freeze_lock, flags); | |
91 | if (suspend_freeze_state > FREEZE_STATE_NONE) { | |
92 | suspend_freeze_state = FREEZE_STATE_WAKE; | |
93 | wake_up(&suspend_freeze_wait_head); | |
94 | } | |
95 | spin_unlock_irqrestore(&suspend_freeze_lock, flags); | |
7e73c5ae ZR |
96 | } |
97 | EXPORT_SYMBOL_GPL(freeze_wake); | |
98 | ||
43e8317b RW |
99 | static bool valid_state(suspend_state_t state) |
100 | { | |
101 | /* | |
102 | * PM_SUSPEND_STANDBY and PM_SUSPEND_MEM states need low level | |
103 | * support and need to be valid to the low level | |
104 | * implementation, no valid callback implies that none are valid. | |
105 | */ | |
106 | return suspend_ops && suspend_ops->valid && suspend_ops->valid(state); | |
107 | } | |
108 | ||
0399d4db RW |
109 | /* |
110 | * If this is set, the "mem" label always corresponds to the deepest sleep state | |
111 | * available, the "standby" label corresponds to the second deepest sleep state | |
112 | * available (if any), and the "freeze" label corresponds to the remaining | |
113 | * available sleep state (if there is one). | |
114 | */ | |
115 | static bool relative_states; | |
116 | ||
117 | static int __init sleep_states_setup(char *str) | |
118 | { | |
119 | relative_states = !strncmp(str, "1", 1); | |
d431cbc5 | 120 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[relative_states ? 0 : 2]; |
0399d4db RW |
121 | return 1; |
122 | } | |
123 | ||
124 | __setup("relative_sleep_states=", sleep_states_setup); | |
125 | ||
a9d70523 | 126 | /** |
55ae4519 RW |
127 | * suspend_set_ops - Set the global suspend method table. |
128 | * @ops: Suspend operations to use. | |
a9d70523 | 129 | */ |
2f55ac07 | 130 | void suspend_set_ops(const struct platform_suspend_ops *ops) |
a9d70523 | 131 | { |
43e8317b | 132 | suspend_state_t i; |
d431cbc5 | 133 | int j = 0; |
43e8317b | 134 | |
bcda53fa | 135 | lock_system_sleep(); |
43e8317b | 136 | |
a9d70523 | 137 | suspend_ops = ops; |
0399d4db | 138 | for (i = PM_SUSPEND_MEM; i >= PM_SUSPEND_STANDBY; i--) |
d431cbc5 RW |
139 | if (valid_state(i)) { |
140 | pm_states[i] = pm_labels[j++]; | |
141 | } else if (!relative_states) { | |
142 | pm_states[i] = NULL; | |
143 | j++; | |
144 | } | |
0399d4db | 145 | |
d431cbc5 | 146 | pm_states[PM_SUSPEND_FREEZE] = pm_labels[j]; |
43e8317b | 147 | |
bcda53fa | 148 | unlock_system_sleep(); |
a9d70523 | 149 | } |
a5e4fd87 | 150 | EXPORT_SYMBOL_GPL(suspend_set_ops); |
a9d70523 | 151 | |
a9d70523 | 152 | /** |
55ae4519 | 153 | * suspend_valid_only_mem - Generic memory-only valid callback. |
a9d70523 | 154 | * |
55ae4519 RW |
155 | * Platform drivers that implement mem suspend only and only need to check for |
156 | * that in their .valid() callback can use this instead of rolling their own | |
157 | * .valid() callback. | |
a9d70523 RW |
158 | */ |
159 | int suspend_valid_only_mem(suspend_state_t state) | |
160 | { | |
161 | return state == PM_SUSPEND_MEM; | |
162 | } | |
a5e4fd87 | 163 | EXPORT_SYMBOL_GPL(suspend_valid_only_mem); |
a9d70523 | 164 | |
8490fdf9 RW |
165 | static bool sleep_state_supported(suspend_state_t state) |
166 | { | |
167 | return state == PM_SUSPEND_FREEZE || (suspend_ops && suspend_ops->enter); | |
168 | } | |
169 | ||
170 | static int platform_suspend_prepare(suspend_state_t state) | |
171 | { | |
172 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare ? | |
173 | suspend_ops->prepare() : 0; | |
174 | } | |
175 | ||
a8d46b9e RW |
176 | static int platform_suspend_prepare_late(suspend_state_t state) |
177 | { | |
403b9636 | 178 | return state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->prepare ? |
a8d46b9e RW |
179 | freeze_ops->prepare() : 0; |
180 | } | |
181 | ||
ebc3e41e | 182 | static int platform_suspend_prepare_noirq(suspend_state_t state) |
8490fdf9 RW |
183 | { |
184 | return state != PM_SUSPEND_FREEZE && suspend_ops->prepare_late ? | |
185 | suspend_ops->prepare_late() : 0; | |
186 | } | |
187 | ||
ebc3e41e | 188 | static void platform_resume_noirq(suspend_state_t state) |
8490fdf9 RW |
189 | { |
190 | if (state != PM_SUSPEND_FREEZE && suspend_ops->wake) | |
191 | suspend_ops->wake(); | |
192 | } | |
193 | ||
a8d46b9e RW |
194 | static void platform_resume_early(suspend_state_t state) |
195 | { | |
403b9636 | 196 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->restore) |
a8d46b9e RW |
197 | freeze_ops->restore(); |
198 | } | |
199 | ||
ebc3e41e | 200 | static void platform_resume_finish(suspend_state_t state) |
8490fdf9 RW |
201 | { |
202 | if (state != PM_SUSPEND_FREEZE && suspend_ops->finish) | |
203 | suspend_ops->finish(); | |
204 | } | |
205 | ||
206 | static int platform_suspend_begin(suspend_state_t state) | |
207 | { | |
208 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->begin) | |
209 | return freeze_ops->begin(); | |
210 | else if (suspend_ops->begin) | |
211 | return suspend_ops->begin(state); | |
212 | else | |
213 | return 0; | |
214 | } | |
215 | ||
ebc3e41e | 216 | static void platform_resume_end(suspend_state_t state) |
8490fdf9 RW |
217 | { |
218 | if (state == PM_SUSPEND_FREEZE && freeze_ops && freeze_ops->end) | |
219 | freeze_ops->end(); | |
220 | else if (suspend_ops->end) | |
221 | suspend_ops->end(); | |
222 | } | |
223 | ||
ebc3e41e | 224 | static void platform_recover(suspend_state_t state) |
8490fdf9 RW |
225 | { |
226 | if (state != PM_SUSPEND_FREEZE && suspend_ops->recover) | |
227 | suspend_ops->recover(); | |
228 | } | |
229 | ||
230 | static bool platform_suspend_again(suspend_state_t state) | |
231 | { | |
232 | return state != PM_SUSPEND_FREEZE && suspend_ops->suspend_again ? | |
233 | suspend_ops->suspend_again() : false; | |
234 | } | |
235 | ||
a9d70523 RW |
236 | static int suspend_test(int level) |
237 | { | |
238 | #ifdef CONFIG_PM_DEBUG | |
239 | if (pm_test_level == level) { | |
240 | printk(KERN_INFO "suspend debug: Waiting for 5 seconds.\n"); | |
241 | mdelay(5000); | |
242 | return 1; | |
243 | } | |
244 | #endif /* !CONFIG_PM_DEBUG */ | |
245 | return 0; | |
246 | } | |
247 | ||
248 | /** | |
55ae4519 | 249 | * suspend_prepare - Prepare for entering system sleep state. |
a9d70523 | 250 | * |
55ae4519 RW |
251 | * Common code run for every system sleep state that can be entered (except for |
252 | * hibernation). Run suspend notifiers, allocate the "suspend" console and | |
253 | * freeze processes. | |
a9d70523 | 254 | */ |
7e73c5ae | 255 | static int suspend_prepare(suspend_state_t state) |
a9d70523 RW |
256 | { |
257 | int error; | |
258 | ||
8490fdf9 | 259 | if (!sleep_state_supported(state)) |
a9d70523 RW |
260 | return -EPERM; |
261 | ||
262 | pm_prepare_console(); | |
263 | ||
264 | error = pm_notifier_call_chain(PM_SUSPEND_PREPARE); | |
265 | if (error) | |
266 | goto Finish; | |
267 | ||
bb3632c6 | 268 | trace_suspend_resume(TPS("freeze_processes"), 0, true); |
a9d70523 | 269 | error = suspend_freeze_processes(); |
bb3632c6 | 270 | trace_suspend_resume(TPS("freeze_processes"), 0, false); |
03afed8b | 271 | if (!error) |
a9d70523 RW |
272 | return 0; |
273 | ||
03afed8b TH |
274 | suspend_stats.failed_freeze++; |
275 | dpm_save_failed_step(SUSPEND_FREEZE); | |
a9d70523 RW |
276 | Finish: |
277 | pm_notifier_call_chain(PM_POST_SUSPEND); | |
278 | pm_restore_console(); | |
279 | return error; | |
280 | } | |
281 | ||
282 | /* default implementation */ | |
52f5684c | 283 | void __weak arch_suspend_disable_irqs(void) |
a9d70523 RW |
284 | { |
285 | local_irq_disable(); | |
286 | } | |
287 | ||
288 | /* default implementation */ | |
52f5684c | 289 | void __weak arch_suspend_enable_irqs(void) |
a9d70523 RW |
290 | { |
291 | local_irq_enable(); | |
292 | } | |
293 | ||
294 | /** | |
55ae4519 RW |
295 | * suspend_enter - Make the system enter the given sleep state. |
296 | * @state: System sleep state to enter. | |
297 | * @wakeup: Returns information that the sleep state should not be re-entered. | |
a9d70523 | 298 | * |
3b5fe852 | 299 | * This function should be called after devices have been suspended. |
a9d70523 | 300 | */ |
3b5fe852 | 301 | static int suspend_enter(suspend_state_t state, bool *wakeup) |
a9d70523 RW |
302 | { |
303 | int error; | |
304 | ||
8490fdf9 RW |
305 | error = platform_suspend_prepare(state); |
306 | if (error) | |
307 | goto Platform_finish; | |
a9d70523 | 308 | |
2a8a8ce6 | 309 | error = dpm_suspend_late(PMSG_SUSPEND); |
a9d70523 | 310 | if (error) { |
2a8a8ce6 | 311 | printk(KERN_ERR "PM: late suspend of devices failed\n"); |
ce441011 | 312 | goto Platform_finish; |
a9d70523 | 313 | } |
a8d46b9e RW |
314 | error = platform_suspend_prepare_late(state); |
315 | if (error) | |
316 | goto Devices_early_resume; | |
317 | ||
2a8a8ce6 RW |
318 | error = dpm_suspend_noirq(PMSG_SUSPEND); |
319 | if (error) { | |
320 | printk(KERN_ERR "PM: noirq suspend of devices failed\n"); | |
a8d46b9e | 321 | goto Platform_early_resume; |
2a8a8ce6 | 322 | } |
ebc3e41e | 323 | error = platform_suspend_prepare_noirq(state); |
8490fdf9 RW |
324 | if (error) |
325 | goto Platform_wake; | |
a9d70523 | 326 | |
08605acc ZR |
327 | if (suspend_test(TEST_PLATFORM)) |
328 | goto Platform_wake; | |
329 | ||
7e73c5ae ZR |
330 | /* |
331 | * PM_SUSPEND_FREEZE equals | |
332 | * frozen processes + suspended devices + idle processors. | |
333 | * Thus we should invoke freeze_enter() soon after | |
334 | * all the devices are suspended. | |
335 | */ | |
336 | if (state == PM_SUSPEND_FREEZE) { | |
bb3632c6 | 337 | trace_suspend_resume(TPS("machine_suspend"), state, true); |
7e73c5ae | 338 | freeze_enter(); |
bb3632c6 | 339 | trace_suspend_resume(TPS("machine_suspend"), state, false); |
7e73c5ae ZR |
340 | goto Platform_wake; |
341 | } | |
342 | ||
a9d70523 RW |
343 | error = disable_nonboot_cpus(); |
344 | if (error || suspend_test(TEST_CPUS)) | |
345 | goto Enable_cpus; | |
346 | ||
347 | arch_suspend_disable_irqs(); | |
348 | BUG_ON(!irqs_disabled()); | |
349 | ||
2e711c04 | 350 | error = syscore_suspend(); |
a9d70523 | 351 | if (!error) { |
3b5fe852 MH |
352 | *wakeup = pm_wakeup_pending(); |
353 | if (!(suspend_test(TEST_CORE) || *wakeup)) { | |
bb3632c6 TB |
354 | trace_suspend_resume(TPS("machine_suspend"), |
355 | state, true); | |
a9d70523 | 356 | error = suspend_ops->enter(state); |
bb3632c6 TB |
357 | trace_suspend_resume(TPS("machine_suspend"), |
358 | state, false); | |
c125e96f RW |
359 | events_check_enabled = false; |
360 | } | |
40dc166c | 361 | syscore_resume(); |
a9d70523 RW |
362 | } |
363 | ||
364 | arch_suspend_enable_irqs(); | |
365 | BUG_ON(irqs_disabled()); | |
366 | ||
367 | Enable_cpus: | |
368 | enable_nonboot_cpus(); | |
369 | ||
370 | Platform_wake: | |
ebc3e41e | 371 | platform_resume_noirq(state); |
2a8a8ce6 RW |
372 | dpm_resume_noirq(PMSG_RESUME); |
373 | ||
a8d46b9e RW |
374 | Platform_early_resume: |
375 | platform_resume_early(state); | |
376 | ||
2a8a8ce6 RW |
377 | Devices_early_resume: |
378 | dpm_resume_early(PMSG_RESUME); | |
a9d70523 | 379 | |
ce441011 | 380 | Platform_finish: |
ebc3e41e | 381 | platform_resume_finish(state); |
a9d70523 RW |
382 | return error; |
383 | } | |
384 | ||
385 | /** | |
55ae4519 RW |
386 | * suspend_devices_and_enter - Suspend devices and enter system sleep state. |
387 | * @state: System sleep state to enter. | |
a9d70523 RW |
388 | */ |
389 | int suspend_devices_and_enter(suspend_state_t state) | |
390 | { | |
391 | int error; | |
3b5fe852 | 392 | bool wakeup = false; |
a9d70523 | 393 | |
8490fdf9 | 394 | if (!sleep_state_supported(state)) |
a9d70523 RW |
395 | return -ENOSYS; |
396 | ||
8490fdf9 RW |
397 | error = platform_suspend_begin(state); |
398 | if (error) | |
399 | goto Close; | |
400 | ||
a9d70523 RW |
401 | suspend_console(); |
402 | suspend_test_start(); | |
403 | error = dpm_suspend_start(PMSG_SUSPEND); | |
404 | if (error) { | |
9350de06 | 405 | pr_err("PM: Some devices failed to suspend, or early wake event detected\n"); |
a9d70523 RW |
406 | goto Recover_platform; |
407 | } | |
408 | suspend_test_finish("suspend devices"); | |
409 | if (suspend_test(TEST_DEVICES)) | |
410 | goto Recover_platform; | |
411 | ||
3b5fe852 MH |
412 | do { |
413 | error = suspend_enter(state, &wakeup); | |
8490fdf9 | 414 | } while (!error && !wakeup && platform_suspend_again(state)); |
a9d70523 RW |
415 | |
416 | Resume_devices: | |
417 | suspend_test_start(); | |
418 | dpm_resume_end(PMSG_RESUME); | |
419 | suspend_test_finish("resume devices"); | |
0cadc702 | 420 | trace_suspend_resume(TPS("resume_console"), state, true); |
a9d70523 | 421 | resume_console(); |
0cadc702 | 422 | trace_suspend_resume(TPS("resume_console"), state, false); |
1f0b6386 | 423 | |
8490fdf9 | 424 | Close: |
ebc3e41e | 425 | platform_resume_end(state); |
a9d70523 RW |
426 | return error; |
427 | ||
428 | Recover_platform: | |
ebc3e41e | 429 | platform_recover(state); |
a9d70523 RW |
430 | goto Resume_devices; |
431 | } | |
432 | ||
433 | /** | |
55ae4519 | 434 | * suspend_finish - Clean up before finishing the suspend sequence. |
a9d70523 | 435 | * |
55ae4519 RW |
436 | * Call platform code to clean up, restart processes, and free the console that |
437 | * we've allocated. This routine is not called for hibernation. | |
a9d70523 RW |
438 | */ |
439 | static void suspend_finish(void) | |
440 | { | |
441 | suspend_thaw_processes(); | |
a9d70523 RW |
442 | pm_notifier_call_chain(PM_POST_SUSPEND); |
443 | pm_restore_console(); | |
444 | } | |
445 | ||
446 | /** | |
55ae4519 RW |
447 | * enter_state - Do common work needed to enter system sleep state. |
448 | * @state: System sleep state to enter. | |
a9d70523 | 449 | * |
55ae4519 RW |
450 | * Make sure that no one else is trying to put the system into a sleep state. |
451 | * Fail if that's not the case. Otherwise, prepare for system suspend, make the | |
452 | * system enter the given sleep state and clean up after wakeup. | |
a9d70523 | 453 | */ |
93e1ee43 | 454 | static int enter_state(suspend_state_t state) |
a9d70523 RW |
455 | { |
456 | int error; | |
457 | ||
bb3632c6 | 458 | trace_suspend_resume(TPS("suspend_enter"), state, true); |
43e8317b RW |
459 | if (state == PM_SUSPEND_FREEZE) { |
460 | #ifdef CONFIG_PM_DEBUG | |
461 | if (pm_test_level != TEST_NONE && pm_test_level <= TEST_CPUS) { | |
462 | pr_warning("PM: Unsupported test mode for freeze state," | |
463 | "please choose none/freezer/devices/platform.\n"); | |
464 | return -EAGAIN; | |
465 | } | |
466 | #endif | |
467 | } else if (!valid_state(state)) { | |
468 | return -EINVAL; | |
469 | } | |
a9d70523 RW |
470 | if (!mutex_trylock(&pm_mutex)) |
471 | return -EBUSY; | |
472 | ||
7e73c5ae ZR |
473 | if (state == PM_SUSPEND_FREEZE) |
474 | freeze_begin(); | |
475 | ||
bb3632c6 | 476 | trace_suspend_resume(TPS("sync_filesystems"), 0, true); |
a9d70523 RW |
477 | printk(KERN_INFO "PM: Syncing filesystems ... "); |
478 | sys_sync(); | |
479 | printk("done.\n"); | |
bb3632c6 | 480 | trace_suspend_resume(TPS("sync_filesystems"), 0, false); |
a9d70523 | 481 | |
d431cbc5 | 482 | pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]); |
7e73c5ae | 483 | error = suspend_prepare(state); |
a9d70523 RW |
484 | if (error) |
485 | goto Unlock; | |
486 | ||
487 | if (suspend_test(TEST_FREEZER)) | |
488 | goto Finish; | |
489 | ||
bb3632c6 | 490 | trace_suspend_resume(TPS("suspend_enter"), state, false); |
d431cbc5 | 491 | pr_debug("PM: Entering %s sleep\n", pm_states[state]); |
87186475 | 492 | pm_restrict_gfp_mask(); |
a9d70523 | 493 | error = suspend_devices_and_enter(state); |
87186475 | 494 | pm_restore_gfp_mask(); |
a9d70523 RW |
495 | |
496 | Finish: | |
497 | pr_debug("PM: Finishing wakeup.\n"); | |
498 | suspend_finish(); | |
499 | Unlock: | |
500 | mutex_unlock(&pm_mutex); | |
501 | return error; | |
502 | } | |
503 | ||
504 | /** | |
55ae4519 RW |
505 | * pm_suspend - Externally visible function for suspending the system. |
506 | * @state: System sleep state to enter. | |
a9d70523 | 507 | * |
55ae4519 RW |
508 | * Check if the value of @state represents one of the supported states, |
509 | * execute enter_state() and update system suspend statistics. | |
a9d70523 RW |
510 | */ |
511 | int pm_suspend(suspend_state_t state) | |
512 | { | |
bc25cf50 RW |
513 | int error; |
514 | ||
515 | if (state <= PM_SUSPEND_ON || state >= PM_SUSPEND_MAX) | |
516 | return -EINVAL; | |
517 | ||
518 | error = enter_state(state); | |
519 | if (error) { | |
520 | suspend_stats.fail++; | |
521 | dpm_save_failed_errno(error); | |
522 | } else { | |
523 | suspend_stats.success++; | |
2a77c46d | 524 | } |
bc25cf50 | 525 | return error; |
a9d70523 RW |
526 | } |
527 | EXPORT_SYMBOL(pm_suspend); |