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1 | /* | |
2 | * sleep.c - ACPI sleep support. | |
3 | * | |
4 | * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> | |
5 | * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> | |
6 | * Copyright (c) 2000-2003 Patrick Mochel | |
7 | * Copyright (c) 2003 Open Source Development Lab | |
8 | * | |
9 | * This file is released under the GPLv2. | |
10 | * | |
11 | */ | |
12 | ||
13 | #include <linux/delay.h> | |
14 | #include <linux/irq.h> | |
15 | #include <linux/dmi.h> | |
16 | #include <linux/device.h> | |
17 | #include <linux/suspend.h> | |
18 | #include <linux/reboot.h> | |
19 | ||
20 | #include <asm/io.h> | |
21 | ||
22 | #include <acpi/acpi_bus.h> | |
23 | #include <acpi/acpi_drivers.h> | |
24 | #include "sleep.h" | |
25 | ||
26 | u8 sleep_states[ACPI_S_STATE_COUNT]; | |
27 | ||
28 | static void acpi_sleep_tts_switch(u32 acpi_state) | |
29 | { | |
30 | union acpi_object in_arg = { ACPI_TYPE_INTEGER }; | |
31 | struct acpi_object_list arg_list = { 1, &in_arg }; | |
32 | acpi_status status = AE_OK; | |
33 | ||
34 | in_arg.integer.value = acpi_state; | |
35 | status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); | |
36 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
37 | /* | |
38 | * OS can't evaluate the _TTS object correctly. Some warning | |
39 | * message will be printed. But it won't break anything. | |
40 | */ | |
41 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); | |
42 | } | |
43 | } | |
44 | ||
45 | static int tts_notify_reboot(struct notifier_block *this, | |
46 | unsigned long code, void *x) | |
47 | { | |
48 | acpi_sleep_tts_switch(ACPI_STATE_S5); | |
49 | return NOTIFY_DONE; | |
50 | } | |
51 | ||
52 | static struct notifier_block tts_notifier = { | |
53 | .notifier_call = tts_notify_reboot, | |
54 | .next = NULL, | |
55 | .priority = 0, | |
56 | }; | |
57 | ||
58 | static int acpi_sleep_prepare(u32 acpi_state) | |
59 | { | |
60 | #ifdef CONFIG_ACPI_SLEEP | |
61 | /* do we have a wakeup address for S2 and S3? */ | |
62 | if (acpi_state == ACPI_STATE_S3) { | |
63 | if (!acpi_wakeup_address) { | |
64 | return -EFAULT; | |
65 | } | |
66 | acpi_set_firmware_waking_vector( | |
67 | (acpi_physical_address)acpi_wakeup_address); | |
68 | ||
69 | } | |
70 | ACPI_FLUSH_CPU_CACHE(); | |
71 | acpi_enable_wakeup_device_prep(acpi_state); | |
72 | #endif | |
73 | printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", | |
74 | acpi_state); | |
75 | acpi_enter_sleep_state_prep(acpi_state); | |
76 | return 0; | |
77 | } | |
78 | ||
79 | #ifdef CONFIG_ACPI_SLEEP | |
80 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; | |
81 | /* | |
82 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the | |
83 | * user to request that behavior by using the 'acpi_old_suspend_ordering' | |
84 | * kernel command line option that causes the following variable to be set. | |
85 | */ | |
86 | static bool old_suspend_ordering; | |
87 | ||
88 | void __init acpi_old_suspend_ordering(void) | |
89 | { | |
90 | old_suspend_ordering = true; | |
91 | } | |
92 | ||
93 | /* | |
94 | * According to the ACPI specification the BIOS should make sure that ACPI is | |
95 | * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still, | |
96 | * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI | |
97 | * on such systems during resume. Unfortunately that doesn't help in | |
98 | * particularly pathological cases in which SCI_EN has to be set directly on | |
99 | * resume, although the specification states very clearly that this flag is | |
100 | * owned by the hardware. The set_sci_en_on_resume variable will be set in such | |
101 | * cases. | |
102 | */ | |
103 | static bool set_sci_en_on_resume; | |
104 | /* | |
105 | * The ACPI specification wants us to save NVS memory regions during hibernation | |
106 | * and to restore them during the subsequent resume. However, it is not certain | |
107 | * if this mechanism is going to work on all machines, so we allow the user to | |
108 | * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line | |
109 | * option. | |
110 | */ | |
111 | static bool s4_no_nvs; | |
112 | ||
113 | void __init acpi_s4_no_nvs(void) | |
114 | { | |
115 | s4_no_nvs = true; | |
116 | } | |
117 | ||
118 | /** | |
119 | * acpi_pm_disable_gpes - Disable the GPEs. | |
120 | */ | |
121 | static int acpi_pm_disable_gpes(void) | |
122 | { | |
123 | acpi_disable_all_gpes(); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | /** | |
128 | * __acpi_pm_prepare - Prepare the platform to enter the target state. | |
129 | * | |
130 | * If necessary, set the firmware waking vector and do arch-specific | |
131 | * nastiness to get the wakeup code to the waking vector. | |
132 | */ | |
133 | static int __acpi_pm_prepare(void) | |
134 | { | |
135 | int error = acpi_sleep_prepare(acpi_target_sleep_state); | |
136 | ||
137 | if (error) | |
138 | acpi_target_sleep_state = ACPI_STATE_S0; | |
139 | return error; | |
140 | } | |
141 | ||
142 | /** | |
143 | * acpi_pm_prepare - Prepare the platform to enter the target sleep | |
144 | * state and disable the GPEs. | |
145 | */ | |
146 | static int acpi_pm_prepare(void) | |
147 | { | |
148 | int error = __acpi_pm_prepare(); | |
149 | ||
150 | if (!error) | |
151 | acpi_disable_all_gpes(); | |
152 | return error; | |
153 | } | |
154 | ||
155 | /** | |
156 | * acpi_pm_finish - Instruct the platform to leave a sleep state. | |
157 | * | |
158 | * This is called after we wake back up (or if entering the sleep state | |
159 | * failed). | |
160 | */ | |
161 | static void acpi_pm_finish(void) | |
162 | { | |
163 | u32 acpi_state = acpi_target_sleep_state; | |
164 | ||
165 | if (acpi_state == ACPI_STATE_S0) | |
166 | return; | |
167 | ||
168 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", | |
169 | acpi_state); | |
170 | acpi_disable_wakeup_device(acpi_state); | |
171 | acpi_leave_sleep_state(acpi_state); | |
172 | ||
173 | /* reset firmware waking vector */ | |
174 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
175 | ||
176 | acpi_target_sleep_state = ACPI_STATE_S0; | |
177 | } | |
178 | ||
179 | /** | |
180 | * acpi_pm_end - Finish up suspend sequence. | |
181 | */ | |
182 | static void acpi_pm_end(void) | |
183 | { | |
184 | /* | |
185 | * This is necessary in case acpi_pm_finish() is not called during a | |
186 | * failing transition to a sleep state. | |
187 | */ | |
188 | acpi_target_sleep_state = ACPI_STATE_S0; | |
189 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
190 | } | |
191 | #else /* !CONFIG_ACPI_SLEEP */ | |
192 | #define acpi_target_sleep_state ACPI_STATE_S0 | |
193 | #endif /* CONFIG_ACPI_SLEEP */ | |
194 | ||
195 | #ifdef CONFIG_SUSPEND | |
196 | extern void do_suspend_lowlevel(void); | |
197 | ||
198 | static u32 acpi_suspend_states[] = { | |
199 | [PM_SUSPEND_ON] = ACPI_STATE_S0, | |
200 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
201 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
202 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 | |
203 | }; | |
204 | ||
205 | /** | |
206 | * acpi_suspend_begin - Set the target system sleep state to the state | |
207 | * associated with given @pm_state, if supported. | |
208 | */ | |
209 | static int acpi_suspend_begin(suspend_state_t pm_state) | |
210 | { | |
211 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
212 | int error = 0; | |
213 | ||
214 | if (sleep_states[acpi_state]) { | |
215 | acpi_target_sleep_state = acpi_state; | |
216 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
217 | } else { | |
218 | printk(KERN_ERR "ACPI does not support this state: %d\n", | |
219 | pm_state); | |
220 | error = -ENOSYS; | |
221 | } | |
222 | return error; | |
223 | } | |
224 | ||
225 | /** | |
226 | * acpi_suspend_enter - Actually enter a sleep state. | |
227 | * @pm_state: ignored | |
228 | * | |
229 | * Flush caches and go to sleep. For STR we have to call arch-specific | |
230 | * assembly, which in turn call acpi_enter_sleep_state(). | |
231 | * It's unfortunate, but it works. Please fix if you're feeling frisky. | |
232 | */ | |
233 | static int acpi_suspend_enter(suspend_state_t pm_state) | |
234 | { | |
235 | acpi_status status = AE_OK; | |
236 | unsigned long flags = 0; | |
237 | u32 acpi_state = acpi_target_sleep_state; | |
238 | ||
239 | ACPI_FLUSH_CPU_CACHE(); | |
240 | ||
241 | /* Do arch specific saving of state. */ | |
242 | if (acpi_state == ACPI_STATE_S3) { | |
243 | int error = acpi_save_state_mem(); | |
244 | ||
245 | if (error) | |
246 | return error; | |
247 | } | |
248 | ||
249 | local_irq_save(flags); | |
250 | acpi_enable_wakeup_device(acpi_state); | |
251 | switch (acpi_state) { | |
252 | case ACPI_STATE_S1: | |
253 | barrier(); | |
254 | status = acpi_enter_sleep_state(acpi_state); | |
255 | break; | |
256 | ||
257 | case ACPI_STATE_S3: | |
258 | do_suspend_lowlevel(); | |
259 | break; | |
260 | } | |
261 | ||
262 | /* If ACPI is not enabled by the BIOS, we need to enable it here. */ | |
263 | if (set_sci_en_on_resume) | |
264 | acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1); | |
265 | else | |
266 | acpi_enable(); | |
267 | ||
268 | /* Reprogram control registers and execute _BFS */ | |
269 | acpi_leave_sleep_state_prep(acpi_state); | |
270 | ||
271 | /* ACPI 3.0 specs (P62) says that it's the responsibility | |
272 | * of the OSPM to clear the status bit [ implying that the | |
273 | * POWER_BUTTON event should not reach userspace ] | |
274 | */ | |
275 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) | |
276 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
277 | ||
278 | /* | |
279 | * Disable and clear GPE status before interrupt is enabled. Some GPEs | |
280 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. | |
281 | * acpi_leave_sleep_state will reenable specific GPEs later | |
282 | */ | |
283 | acpi_disable_all_gpes(); | |
284 | ||
285 | local_irq_restore(flags); | |
286 | printk(KERN_DEBUG "Back to C!\n"); | |
287 | ||
288 | /* restore processor state */ | |
289 | if (acpi_state == ACPI_STATE_S3) | |
290 | acpi_restore_state_mem(); | |
291 | ||
292 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
293 | } | |
294 | ||
295 | static int acpi_suspend_state_valid(suspend_state_t pm_state) | |
296 | { | |
297 | u32 acpi_state; | |
298 | ||
299 | switch (pm_state) { | |
300 | case PM_SUSPEND_ON: | |
301 | case PM_SUSPEND_STANDBY: | |
302 | case PM_SUSPEND_MEM: | |
303 | acpi_state = acpi_suspend_states[pm_state]; | |
304 | ||
305 | return sleep_states[acpi_state]; | |
306 | default: | |
307 | return 0; | |
308 | } | |
309 | } | |
310 | ||
311 | static struct platform_suspend_ops acpi_suspend_ops = { | |
312 | .valid = acpi_suspend_state_valid, | |
313 | .begin = acpi_suspend_begin, | |
314 | .prepare = acpi_pm_prepare, | |
315 | .enter = acpi_suspend_enter, | |
316 | .finish = acpi_pm_finish, | |
317 | .end = acpi_pm_end, | |
318 | }; | |
319 | ||
320 | /** | |
321 | * acpi_suspend_begin_old - Set the target system sleep state to the | |
322 | * state associated with given @pm_state, if supported, and | |
323 | * execute the _PTS control method. This function is used if the | |
324 | * pre-ACPI 2.0 suspend ordering has been requested. | |
325 | */ | |
326 | static int acpi_suspend_begin_old(suspend_state_t pm_state) | |
327 | { | |
328 | int error = acpi_suspend_begin(pm_state); | |
329 | ||
330 | if (!error) | |
331 | error = __acpi_pm_prepare(); | |
332 | return error; | |
333 | } | |
334 | ||
335 | /* | |
336 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
337 | * been requested. | |
338 | */ | |
339 | static struct platform_suspend_ops acpi_suspend_ops_old = { | |
340 | .valid = acpi_suspend_state_valid, | |
341 | .begin = acpi_suspend_begin_old, | |
342 | .prepare = acpi_pm_disable_gpes, | |
343 | .enter = acpi_suspend_enter, | |
344 | .finish = acpi_pm_finish, | |
345 | .end = acpi_pm_end, | |
346 | .recover = acpi_pm_finish, | |
347 | }; | |
348 | ||
349 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) | |
350 | { | |
351 | old_suspend_ordering = true; | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d) | |
356 | { | |
357 | set_sci_en_on_resume = true; | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { | |
362 | { | |
363 | .callback = init_old_suspend_ordering, | |
364 | .ident = "Abit KN9 (nForce4 variant)", | |
365 | .matches = { | |
366 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), | |
367 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), | |
368 | }, | |
369 | }, | |
370 | { | |
371 | .callback = init_old_suspend_ordering, | |
372 | .ident = "HP xw4600 Workstation", | |
373 | .matches = { | |
374 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
375 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), | |
376 | }, | |
377 | }, | |
378 | { | |
379 | .callback = init_set_sci_en_on_resume, | |
380 | .ident = "Apple MacBook 1,1", | |
381 | .matches = { | |
382 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), | |
383 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"), | |
384 | }, | |
385 | }, | |
386 | { | |
387 | .callback = init_set_sci_en_on_resume, | |
388 | .ident = "Apple MacMini 1,1", | |
389 | .matches = { | |
390 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), | |
391 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"), | |
392 | }, | |
393 | }, | |
394 | {}, | |
395 | }; | |
396 | #endif /* CONFIG_SUSPEND */ | |
397 | ||
398 | #ifdef CONFIG_HIBERNATION | |
399 | static unsigned long s4_hardware_signature; | |
400 | static struct acpi_table_facs *facs; | |
401 | static bool nosigcheck; | |
402 | ||
403 | void __init acpi_no_s4_hw_signature(void) | |
404 | { | |
405 | nosigcheck = true; | |
406 | } | |
407 | ||
408 | static int acpi_hibernation_begin(void) | |
409 | { | |
410 | int error; | |
411 | ||
412 | error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); | |
413 | if (!error) { | |
414 | acpi_target_sleep_state = ACPI_STATE_S4; | |
415 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
416 | } | |
417 | ||
418 | return error; | |
419 | } | |
420 | ||
421 | static int acpi_hibernation_pre_snapshot(void) | |
422 | { | |
423 | int error = acpi_pm_prepare(); | |
424 | ||
425 | if (!error) | |
426 | hibernate_nvs_save(); | |
427 | ||
428 | return error; | |
429 | } | |
430 | ||
431 | static int acpi_hibernation_enter(void) | |
432 | { | |
433 | acpi_status status = AE_OK; | |
434 | unsigned long flags = 0; | |
435 | ||
436 | ACPI_FLUSH_CPU_CACHE(); | |
437 | ||
438 | local_irq_save(flags); | |
439 | acpi_enable_wakeup_device(ACPI_STATE_S4); | |
440 | /* This shouldn't return. If it returns, we have a problem */ | |
441 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
442 | /* Reprogram control registers and execute _BFS */ | |
443 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
444 | local_irq_restore(flags); | |
445 | ||
446 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
447 | } | |
448 | ||
449 | static void acpi_hibernation_finish(void) | |
450 | { | |
451 | hibernate_nvs_free(); | |
452 | acpi_pm_finish(); | |
453 | } | |
454 | ||
455 | static void acpi_hibernation_leave(void) | |
456 | { | |
457 | /* | |
458 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to | |
459 | * enable it here. | |
460 | */ | |
461 | acpi_enable(); | |
462 | /* Reprogram control registers and execute _BFS */ | |
463 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
464 | /* Check the hardware signature */ | |
465 | if (facs && s4_hardware_signature != facs->hardware_signature) { | |
466 | printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " | |
467 | "cannot resume!\n"); | |
468 | panic("ACPI S4 hardware signature mismatch"); | |
469 | } | |
470 | /* Restore the NVS memory area */ | |
471 | hibernate_nvs_restore(); | |
472 | } | |
473 | ||
474 | static void acpi_pm_enable_gpes(void) | |
475 | { | |
476 | acpi_enable_all_runtime_gpes(); | |
477 | } | |
478 | ||
479 | static struct platform_hibernation_ops acpi_hibernation_ops = { | |
480 | .begin = acpi_hibernation_begin, | |
481 | .end = acpi_pm_end, | |
482 | .pre_snapshot = acpi_hibernation_pre_snapshot, | |
483 | .finish = acpi_hibernation_finish, | |
484 | .prepare = acpi_pm_prepare, | |
485 | .enter = acpi_hibernation_enter, | |
486 | .leave = acpi_hibernation_leave, | |
487 | .pre_restore = acpi_pm_disable_gpes, | |
488 | .restore_cleanup = acpi_pm_enable_gpes, | |
489 | }; | |
490 | ||
491 | /** | |
492 | * acpi_hibernation_begin_old - Set the target system sleep state to | |
493 | * ACPI_STATE_S4 and execute the _PTS control method. This | |
494 | * function is used if the pre-ACPI 2.0 suspend ordering has been | |
495 | * requested. | |
496 | */ | |
497 | static int acpi_hibernation_begin_old(void) | |
498 | { | |
499 | int error; | |
500 | /* | |
501 | * The _TTS object should always be evaluated before the _PTS object. | |
502 | * When the old_suspended_ordering is true, the _PTS object is | |
503 | * evaluated in the acpi_sleep_prepare. | |
504 | */ | |
505 | acpi_sleep_tts_switch(ACPI_STATE_S4); | |
506 | ||
507 | error = acpi_sleep_prepare(ACPI_STATE_S4); | |
508 | ||
509 | if (!error) { | |
510 | if (!s4_no_nvs) | |
511 | error = hibernate_nvs_alloc(); | |
512 | if (!error) | |
513 | acpi_target_sleep_state = ACPI_STATE_S4; | |
514 | } | |
515 | return error; | |
516 | } | |
517 | ||
518 | static int acpi_hibernation_pre_snapshot_old(void) | |
519 | { | |
520 | int error = acpi_pm_disable_gpes(); | |
521 | ||
522 | if (!error) | |
523 | hibernate_nvs_save(); | |
524 | ||
525 | return error; | |
526 | } | |
527 | ||
528 | /* | |
529 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
530 | * been requested. | |
531 | */ | |
532 | static struct platform_hibernation_ops acpi_hibernation_ops_old = { | |
533 | .begin = acpi_hibernation_begin_old, | |
534 | .end = acpi_pm_end, | |
535 | .pre_snapshot = acpi_hibernation_pre_snapshot_old, | |
536 | .finish = acpi_hibernation_finish, | |
537 | .prepare = acpi_pm_disable_gpes, | |
538 | .enter = acpi_hibernation_enter, | |
539 | .leave = acpi_hibernation_leave, | |
540 | .pre_restore = acpi_pm_disable_gpes, | |
541 | .restore_cleanup = acpi_pm_enable_gpes, | |
542 | .recover = acpi_pm_finish, | |
543 | }; | |
544 | #endif /* CONFIG_HIBERNATION */ | |
545 | ||
546 | int acpi_suspend(u32 acpi_state) | |
547 | { | |
548 | suspend_state_t states[] = { | |
549 | [1] = PM_SUSPEND_STANDBY, | |
550 | [3] = PM_SUSPEND_MEM, | |
551 | [5] = PM_SUSPEND_MAX | |
552 | }; | |
553 | ||
554 | if (acpi_state < 6 && states[acpi_state]) | |
555 | return pm_suspend(states[acpi_state]); | |
556 | if (acpi_state == 4) | |
557 | return hibernate(); | |
558 | return -EINVAL; | |
559 | } | |
560 | ||
561 | #ifdef CONFIG_PM_SLEEP | |
562 | /** | |
563 | * acpi_pm_device_sleep_state - return preferred power state of ACPI device | |
564 | * in the system sleep state given by %acpi_target_sleep_state | |
565 | * @dev: device to examine; its driver model wakeup flags control | |
566 | * whether it should be able to wake up the system | |
567 | * @d_min_p: used to store the upper limit of allowed states range | |
568 | * Return value: preferred power state of the device on success, -ENODEV on | |
569 | * failure (ie. if there's no 'struct acpi_device' for @dev) | |
570 | * | |
571 | * Find the lowest power (highest number) ACPI device power state that | |
572 | * device @dev can be in while the system is in the sleep state represented | |
573 | * by %acpi_target_sleep_state. If @wake is nonzero, the device should be | |
574 | * able to wake up the system from this sleep state. If @d_min_p is set, | |
575 | * the highest power (lowest number) device power state of @dev allowed | |
576 | * in this system sleep state is stored at the location pointed to by it. | |
577 | * | |
578 | * The caller must ensure that @dev is valid before using this function. | |
579 | * The caller is also responsible for figuring out if the device is | |
580 | * supposed to be able to wake up the system and passing this information | |
581 | * via @wake. | |
582 | */ | |
583 | ||
584 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) | |
585 | { | |
586 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
587 | struct acpi_device *adev; | |
588 | char acpi_method[] = "_SxD"; | |
589 | unsigned long long d_min, d_max; | |
590 | ||
591 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
592 | printk(KERN_DEBUG "ACPI handle has no context!\n"); | |
593 | return -ENODEV; | |
594 | } | |
595 | ||
596 | acpi_method[2] = '0' + acpi_target_sleep_state; | |
597 | /* | |
598 | * If the sleep state is S0, we will return D3, but if the device has | |
599 | * _S0W, we will use the value from _S0W | |
600 | */ | |
601 | d_min = ACPI_STATE_D0; | |
602 | d_max = ACPI_STATE_D3; | |
603 | ||
604 | /* | |
605 | * If present, _SxD methods return the minimum D-state (highest power | |
606 | * state) we can use for the corresponding S-states. Otherwise, the | |
607 | * minimum D-state is D0 (ACPI 3.x). | |
608 | * | |
609 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer | |
610 | * provided -- that's our fault recovery, we ignore retval. | |
611 | */ | |
612 | if (acpi_target_sleep_state > ACPI_STATE_S0) | |
613 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); | |
614 | ||
615 | /* | |
616 | * If _PRW says we can wake up the system from the target sleep state, | |
617 | * the D-state returned by _SxD is sufficient for that (we assume a | |
618 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
619 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
620 | * can wake the system. _S0W may be valid, too. | |
621 | */ | |
622 | if (acpi_target_sleep_state == ACPI_STATE_S0 || | |
623 | (device_may_wakeup(dev) && adev->wakeup.state.enabled && | |
624 | adev->wakeup.sleep_state <= acpi_target_sleep_state)) { | |
625 | acpi_status status; | |
626 | ||
627 | acpi_method[3] = 'W'; | |
628 | status = acpi_evaluate_integer(handle, acpi_method, NULL, | |
629 | &d_max); | |
630 | if (ACPI_FAILURE(status)) { | |
631 | d_max = d_min; | |
632 | } else if (d_max < d_min) { | |
633 | /* Warn the user of the broken DSDT */ | |
634 | printk(KERN_WARNING "ACPI: Wrong value from %s\n", | |
635 | acpi_method); | |
636 | /* Sanitize it */ | |
637 | d_min = d_max; | |
638 | } | |
639 | } | |
640 | ||
641 | if (d_min_p) | |
642 | *d_min_p = d_min; | |
643 | return d_max; | |
644 | } | |
645 | ||
646 | /** | |
647 | * acpi_pm_device_sleep_wake - enable or disable the system wake-up | |
648 | * capability of given device | |
649 | * @dev: device to handle | |
650 | * @enable: 'true' - enable, 'false' - disable the wake-up capability | |
651 | */ | |
652 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
653 | { | |
654 | acpi_handle handle; | |
655 | struct acpi_device *adev; | |
656 | ||
657 | if (!device_may_wakeup(dev)) | |
658 | return -EINVAL; | |
659 | ||
660 | handle = DEVICE_ACPI_HANDLE(dev); | |
661 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
662 | printk(KERN_DEBUG "ACPI handle has no context!\n"); | |
663 | return -ENODEV; | |
664 | } | |
665 | ||
666 | return enable ? | |
667 | acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : | |
668 | acpi_disable_wakeup_device_power(adev); | |
669 | } | |
670 | #endif | |
671 | ||
672 | static void acpi_power_off_prepare(void) | |
673 | { | |
674 | /* Prepare to power off the system */ | |
675 | acpi_sleep_prepare(ACPI_STATE_S5); | |
676 | acpi_disable_all_gpes(); | |
677 | } | |
678 | ||
679 | static void acpi_power_off(void) | |
680 | { | |
681 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ | |
682 | printk("%s called\n", __func__); | |
683 | local_irq_disable(); | |
684 | acpi_enable_wakeup_device(ACPI_STATE_S5); | |
685 | acpi_enter_sleep_state(ACPI_STATE_S5); | |
686 | } | |
687 | ||
688 | int __init acpi_sleep_init(void) | |
689 | { | |
690 | acpi_status status; | |
691 | u8 type_a, type_b; | |
692 | #ifdef CONFIG_SUSPEND | |
693 | int i = 0; | |
694 | ||
695 | dmi_check_system(acpisleep_dmi_table); | |
696 | #endif | |
697 | ||
698 | if (acpi_disabled) | |
699 | return 0; | |
700 | ||
701 | sleep_states[ACPI_STATE_S0] = 1; | |
702 | printk(KERN_INFO PREFIX "(supports S0"); | |
703 | ||
704 | #ifdef CONFIG_SUSPEND | |
705 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { | |
706 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); | |
707 | if (ACPI_SUCCESS(status)) { | |
708 | sleep_states[i] = 1; | |
709 | printk(" S%d", i); | |
710 | } | |
711 | } | |
712 | ||
713 | suspend_set_ops(old_suspend_ordering ? | |
714 | &acpi_suspend_ops_old : &acpi_suspend_ops); | |
715 | #endif | |
716 | ||
717 | #ifdef CONFIG_HIBERNATION | |
718 | status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); | |
719 | if (ACPI_SUCCESS(status)) { | |
720 | hibernation_set_ops(old_suspend_ordering ? | |
721 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); | |
722 | sleep_states[ACPI_STATE_S4] = 1; | |
723 | printk(" S4"); | |
724 | if (!nosigcheck) { | |
725 | acpi_get_table(ACPI_SIG_FACS, 1, | |
726 | (struct acpi_table_header **)&facs); | |
727 | if (facs) | |
728 | s4_hardware_signature = | |
729 | facs->hardware_signature; | |
730 | } | |
731 | } | |
732 | #endif | |
733 | status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); | |
734 | if (ACPI_SUCCESS(status)) { | |
735 | sleep_states[ACPI_STATE_S5] = 1; | |
736 | printk(" S5"); | |
737 | pm_power_off_prepare = acpi_power_off_prepare; | |
738 | pm_power_off = acpi_power_off; | |
739 | } | |
740 | printk(")\n"); | |
741 | /* | |
742 | * Register the tts_notifier to reboot notifier list so that the _TTS | |
743 | * object can also be evaluated when the system enters S5. | |
744 | */ | |
745 | register_reboot_notifier(&tts_notifier); | |
746 | return 0; | |
747 | } |