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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 | ||
25 | #include "internal.h" | |
26 | #include "sleep.h" | |
27 | ||
28 | static u8 sleep_states[ACPI_S_STATE_COUNT]; | |
29 | ||
30 | static void acpi_sleep_tts_switch(u32 acpi_state) | |
31 | { | |
32 | union acpi_object in_arg = { ACPI_TYPE_INTEGER }; | |
33 | struct acpi_object_list arg_list = { 1, &in_arg }; | |
34 | acpi_status status = AE_OK; | |
35 | ||
36 | in_arg.integer.value = acpi_state; | |
37 | status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); | |
38 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
39 | /* | |
40 | * OS can't evaluate the _TTS object correctly. Some warning | |
41 | * message will be printed. But it won't break anything. | |
42 | */ | |
43 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); | |
44 | } | |
45 | } | |
46 | ||
47 | static int tts_notify_reboot(struct notifier_block *this, | |
48 | unsigned long code, void *x) | |
49 | { | |
50 | acpi_sleep_tts_switch(ACPI_STATE_S5); | |
51 | return NOTIFY_DONE; | |
52 | } | |
53 | ||
54 | static struct notifier_block tts_notifier = { | |
55 | .notifier_call = tts_notify_reboot, | |
56 | .next = NULL, | |
57 | .priority = 0, | |
58 | }; | |
59 | ||
60 | static int acpi_sleep_prepare(u32 acpi_state) | |
61 | { | |
62 | #ifdef CONFIG_ACPI_SLEEP | |
63 | /* do we have a wakeup address for S2 and S3? */ | |
64 | if (acpi_state == ACPI_STATE_S3) { | |
65 | if (!acpi_wakeup_address) { | |
66 | return -EFAULT; | |
67 | } | |
68 | acpi_set_firmware_waking_vector( | |
69 | (acpi_physical_address)acpi_wakeup_address); | |
70 | ||
71 | } | |
72 | ACPI_FLUSH_CPU_CACHE(); | |
73 | #endif | |
74 | printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", | |
75 | acpi_state); | |
76 | acpi_enable_wakeup_devices(acpi_state); | |
77 | acpi_enter_sleep_state_prep(acpi_state); | |
78 | return 0; | |
79 | } | |
80 | ||
81 | #ifdef CONFIG_ACPI_SLEEP | |
82 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; | |
83 | ||
84 | /* | |
85 | * The ACPI specification wants us to save NVS memory regions during hibernation | |
86 | * and to restore them during the subsequent resume. Windows does that also for | |
87 | * suspend to RAM. However, it is known that this mechanism does not work on | |
88 | * all machines, so we allow the user to disable it with the help of the | |
89 | * 'acpi_sleep=nonvs' kernel command line option. | |
90 | */ | |
91 | static bool nvs_nosave; | |
92 | ||
93 | void __init acpi_nvs_nosave(void) | |
94 | { | |
95 | nvs_nosave = true; | |
96 | } | |
97 | ||
98 | /* | |
99 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the | |
100 | * user to request that behavior by using the 'acpi_old_suspend_ordering' | |
101 | * kernel command line option that causes the following variable to be set. | |
102 | */ | |
103 | static bool old_suspend_ordering; | |
104 | ||
105 | void __init acpi_old_suspend_ordering(void) | |
106 | { | |
107 | old_suspend_ordering = true; | |
108 | } | |
109 | ||
110 | /** | |
111 | * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. | |
112 | */ | |
113 | static int acpi_pm_freeze(void) | |
114 | { | |
115 | acpi_disable_all_gpes(); | |
116 | acpi_os_wait_events_complete(NULL); | |
117 | acpi_ec_block_transactions(); | |
118 | return 0; | |
119 | } | |
120 | ||
121 | /** | |
122 | * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. | |
123 | */ | |
124 | static int acpi_pm_pre_suspend(void) | |
125 | { | |
126 | acpi_pm_freeze(); | |
127 | return suspend_nvs_save(); | |
128 | } | |
129 | ||
130 | /** | |
131 | * __acpi_pm_prepare - Prepare the platform to enter the target state. | |
132 | * | |
133 | * If necessary, set the firmware waking vector and do arch-specific | |
134 | * nastiness to get the wakeup code to the waking vector. | |
135 | */ | |
136 | static int __acpi_pm_prepare(void) | |
137 | { | |
138 | int error = acpi_sleep_prepare(acpi_target_sleep_state); | |
139 | if (error) | |
140 | acpi_target_sleep_state = ACPI_STATE_S0; | |
141 | ||
142 | return error; | |
143 | } | |
144 | ||
145 | /** | |
146 | * acpi_pm_prepare - Prepare the platform to enter the target sleep | |
147 | * state and disable the GPEs. | |
148 | */ | |
149 | static int acpi_pm_prepare(void) | |
150 | { | |
151 | int error = __acpi_pm_prepare(); | |
152 | if (!error) | |
153 | error = acpi_pm_pre_suspend(); | |
154 | ||
155 | return error; | |
156 | } | |
157 | ||
158 | /** | |
159 | * acpi_pm_finish - Instruct the platform to leave a sleep state. | |
160 | * | |
161 | * This is called after we wake back up (or if entering the sleep state | |
162 | * failed). | |
163 | */ | |
164 | static void acpi_pm_finish(void) | |
165 | { | |
166 | u32 acpi_state = acpi_target_sleep_state; | |
167 | ||
168 | acpi_ec_unblock_transactions(); | |
169 | suspend_nvs_free(); | |
170 | ||
171 | if (acpi_state == ACPI_STATE_S0) | |
172 | return; | |
173 | ||
174 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", | |
175 | acpi_state); | |
176 | acpi_disable_wakeup_devices(acpi_state); | |
177 | acpi_leave_sleep_state(acpi_state); | |
178 | ||
179 | /* reset firmware waking vector */ | |
180 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
181 | ||
182 | acpi_target_sleep_state = ACPI_STATE_S0; | |
183 | } | |
184 | ||
185 | /** | |
186 | * acpi_pm_end - Finish up suspend sequence. | |
187 | */ | |
188 | static void acpi_pm_end(void) | |
189 | { | |
190 | /* | |
191 | * This is necessary in case acpi_pm_finish() is not called during a | |
192 | * failing transition to a sleep state. | |
193 | */ | |
194 | acpi_target_sleep_state = ACPI_STATE_S0; | |
195 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
196 | } | |
197 | #else /* !CONFIG_ACPI_SLEEP */ | |
198 | #define acpi_target_sleep_state ACPI_STATE_S0 | |
199 | #endif /* CONFIG_ACPI_SLEEP */ | |
200 | ||
201 | #ifdef CONFIG_SUSPEND | |
202 | extern void do_suspend_lowlevel(void); | |
203 | ||
204 | static u32 acpi_suspend_states[] = { | |
205 | [PM_SUSPEND_ON] = ACPI_STATE_S0, | |
206 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
207 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
208 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 | |
209 | }; | |
210 | ||
211 | /** | |
212 | * acpi_suspend_begin - Set the target system sleep state to the state | |
213 | * associated with given @pm_state, if supported. | |
214 | */ | |
215 | static int acpi_suspend_begin(suspend_state_t pm_state) | |
216 | { | |
217 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
218 | int error = 0; | |
219 | ||
220 | error = nvs_nosave ? 0 : suspend_nvs_alloc(); | |
221 | if (error) | |
222 | return error; | |
223 | ||
224 | if (sleep_states[acpi_state]) { | |
225 | acpi_target_sleep_state = acpi_state; | |
226 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
227 | } else { | |
228 | printk(KERN_ERR "ACPI does not support this state: %d\n", | |
229 | pm_state); | |
230 | error = -ENOSYS; | |
231 | } | |
232 | return error; | |
233 | } | |
234 | ||
235 | /** | |
236 | * acpi_suspend_enter - Actually enter a sleep state. | |
237 | * @pm_state: ignored | |
238 | * | |
239 | * Flush caches and go to sleep. For STR we have to call arch-specific | |
240 | * assembly, which in turn call acpi_enter_sleep_state(). | |
241 | * It's unfortunate, but it works. Please fix if you're feeling frisky. | |
242 | */ | |
243 | static int acpi_suspend_enter(suspend_state_t pm_state) | |
244 | { | |
245 | acpi_status status = AE_OK; | |
246 | u32 acpi_state = acpi_target_sleep_state; | |
247 | ||
248 | ACPI_FLUSH_CPU_CACHE(); | |
249 | ||
250 | /* Do arch specific saving of state. */ | |
251 | if (acpi_state == ACPI_STATE_S3) { | |
252 | int error = acpi_save_state_mem(); | |
253 | ||
254 | if (error) | |
255 | return error; | |
256 | } | |
257 | ||
258 | switch (acpi_state) { | |
259 | case ACPI_STATE_S1: | |
260 | barrier(); | |
261 | status = acpi_enter_sleep_state(acpi_state); | |
262 | break; | |
263 | ||
264 | case ACPI_STATE_S3: | |
265 | do_suspend_lowlevel(); | |
266 | pr_info(PREFIX "Low-level resume complete\n"); | |
267 | break; | |
268 | } | |
269 | ||
270 | /* This violates the spec but is required for bug compatibility. */ | |
271 | acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); | |
272 | ||
273 | /* Reprogram control registers and execute _BFS */ | |
274 | acpi_leave_sleep_state_prep(acpi_state); | |
275 | ||
276 | /* ACPI 3.0 specs (P62) says that it's the responsibility | |
277 | * of the OSPM to clear the status bit [ implying that the | |
278 | * POWER_BUTTON event should not reach userspace ] | |
279 | */ | |
280 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) | |
281 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
282 | ||
283 | /* | |
284 | * Disable and clear GPE status before interrupt is enabled. Some GPEs | |
285 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. | |
286 | * acpi_leave_sleep_state will reenable specific GPEs later | |
287 | */ | |
288 | acpi_disable_all_gpes(); | |
289 | /* Allow EC transactions to happen. */ | |
290 | acpi_ec_unblock_transactions_early(); | |
291 | ||
292 | suspend_nvs_restore(); | |
293 | ||
294 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
295 | } | |
296 | ||
297 | static int acpi_suspend_state_valid(suspend_state_t pm_state) | |
298 | { | |
299 | u32 acpi_state; | |
300 | ||
301 | switch (pm_state) { | |
302 | case PM_SUSPEND_ON: | |
303 | case PM_SUSPEND_STANDBY: | |
304 | case PM_SUSPEND_MEM: | |
305 | acpi_state = acpi_suspend_states[pm_state]; | |
306 | ||
307 | return sleep_states[acpi_state]; | |
308 | default: | |
309 | return 0; | |
310 | } | |
311 | } | |
312 | ||
313 | static const struct platform_suspend_ops acpi_suspend_ops = { | |
314 | .valid = acpi_suspend_state_valid, | |
315 | .begin = acpi_suspend_begin, | |
316 | .prepare_late = acpi_pm_prepare, | |
317 | .enter = acpi_suspend_enter, | |
318 | .wake = acpi_pm_finish, | |
319 | .end = acpi_pm_end, | |
320 | }; | |
321 | ||
322 | /** | |
323 | * acpi_suspend_begin_old - Set the target system sleep state to the | |
324 | * state associated with given @pm_state, if supported, and | |
325 | * execute the _PTS control method. This function is used if the | |
326 | * pre-ACPI 2.0 suspend ordering has been requested. | |
327 | */ | |
328 | static int acpi_suspend_begin_old(suspend_state_t pm_state) | |
329 | { | |
330 | int error = acpi_suspend_begin(pm_state); | |
331 | if (!error) | |
332 | error = __acpi_pm_prepare(); | |
333 | ||
334 | return error; | |
335 | } | |
336 | ||
337 | /* | |
338 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
339 | * been requested. | |
340 | */ | |
341 | static const struct platform_suspend_ops acpi_suspend_ops_old = { | |
342 | .valid = acpi_suspend_state_valid, | |
343 | .begin = acpi_suspend_begin_old, | |
344 | .prepare_late = acpi_pm_pre_suspend, | |
345 | .enter = acpi_suspend_enter, | |
346 | .wake = acpi_pm_finish, | |
347 | .end = acpi_pm_end, | |
348 | .recover = acpi_pm_finish, | |
349 | }; | |
350 | ||
351 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) | |
352 | { | |
353 | old_suspend_ordering = true; | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static int __init init_nvs_nosave(const struct dmi_system_id *d) | |
358 | { | |
359 | acpi_nvs_nosave(); | |
360 | return 0; | |
361 | } | |
362 | ||
363 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { | |
364 | { | |
365 | .callback = init_old_suspend_ordering, | |
366 | .ident = "Abit KN9 (nForce4 variant)", | |
367 | .matches = { | |
368 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), | |
369 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), | |
370 | }, | |
371 | }, | |
372 | { | |
373 | .callback = init_old_suspend_ordering, | |
374 | .ident = "HP xw4600 Workstation", | |
375 | .matches = { | |
376 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
377 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), | |
378 | }, | |
379 | }, | |
380 | { | |
381 | .callback = init_old_suspend_ordering, | |
382 | .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", | |
383 | .matches = { | |
384 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), | |
385 | DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), | |
386 | }, | |
387 | }, | |
388 | { | |
389 | .callback = init_old_suspend_ordering, | |
390 | .ident = "Panasonic CF51-2L", | |
391 | .matches = { | |
392 | DMI_MATCH(DMI_BOARD_VENDOR, | |
393 | "Matsushita Electric Industrial Co.,Ltd."), | |
394 | DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), | |
395 | }, | |
396 | }, | |
397 | { | |
398 | .callback = init_nvs_nosave, | |
399 | .ident = "Sony Vaio VGN-SR11M", | |
400 | .matches = { | |
401 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
402 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), | |
403 | }, | |
404 | }, | |
405 | { | |
406 | .callback = init_nvs_nosave, | |
407 | .ident = "Everex StepNote Series", | |
408 | .matches = { | |
409 | DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), | |
410 | DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), | |
411 | }, | |
412 | }, | |
413 | { | |
414 | .callback = init_nvs_nosave, | |
415 | .ident = "Sony Vaio VPCEB1Z1E", | |
416 | .matches = { | |
417 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
418 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), | |
419 | }, | |
420 | }, | |
421 | { | |
422 | .callback = init_nvs_nosave, | |
423 | .ident = "Sony Vaio VGN-NW130D", | |
424 | .matches = { | |
425 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
426 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), | |
427 | }, | |
428 | }, | |
429 | { | |
430 | .callback = init_nvs_nosave, | |
431 | .ident = "Averatec AV1020-ED2", | |
432 | .matches = { | |
433 | DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), | |
434 | DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), | |
435 | }, | |
436 | }, | |
437 | {}, | |
438 | }; | |
439 | #endif /* CONFIG_SUSPEND */ | |
440 | ||
441 | #ifdef CONFIG_HIBERNATION | |
442 | static unsigned long s4_hardware_signature; | |
443 | static struct acpi_table_facs *facs; | |
444 | static bool nosigcheck; | |
445 | ||
446 | void __init acpi_no_s4_hw_signature(void) | |
447 | { | |
448 | nosigcheck = true; | |
449 | } | |
450 | ||
451 | static int acpi_hibernation_begin(void) | |
452 | { | |
453 | int error; | |
454 | ||
455 | error = nvs_nosave ? 0 : suspend_nvs_alloc(); | |
456 | if (!error) { | |
457 | acpi_target_sleep_state = ACPI_STATE_S4; | |
458 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
459 | } | |
460 | ||
461 | return error; | |
462 | } | |
463 | ||
464 | static int acpi_hibernation_enter(void) | |
465 | { | |
466 | acpi_status status = AE_OK; | |
467 | unsigned long flags = 0; | |
468 | ||
469 | ACPI_FLUSH_CPU_CACHE(); | |
470 | ||
471 | local_irq_save(flags); | |
472 | /* This shouldn't return. If it returns, we have a problem */ | |
473 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
474 | /* Reprogram control registers and execute _BFS */ | |
475 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
476 | local_irq_restore(flags); | |
477 | ||
478 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
479 | } | |
480 | ||
481 | static void acpi_hibernation_leave(void) | |
482 | { | |
483 | /* | |
484 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to | |
485 | * enable it here. | |
486 | */ | |
487 | acpi_enable(); | |
488 | /* Reprogram control registers and execute _BFS */ | |
489 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
490 | /* Check the hardware signature */ | |
491 | if (facs && s4_hardware_signature != facs->hardware_signature) { | |
492 | printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " | |
493 | "cannot resume!\n"); | |
494 | panic("ACPI S4 hardware signature mismatch"); | |
495 | } | |
496 | /* Restore the NVS memory area */ | |
497 | suspend_nvs_restore(); | |
498 | /* Allow EC transactions to happen. */ | |
499 | acpi_ec_unblock_transactions_early(); | |
500 | } | |
501 | ||
502 | static void acpi_pm_thaw(void) | |
503 | { | |
504 | acpi_ec_unblock_transactions(); | |
505 | acpi_enable_all_runtime_gpes(); | |
506 | } | |
507 | ||
508 | static const struct platform_hibernation_ops acpi_hibernation_ops = { | |
509 | .begin = acpi_hibernation_begin, | |
510 | .end = acpi_pm_end, | |
511 | .pre_snapshot = acpi_pm_prepare, | |
512 | .finish = acpi_pm_finish, | |
513 | .prepare = acpi_pm_prepare, | |
514 | .enter = acpi_hibernation_enter, | |
515 | .leave = acpi_hibernation_leave, | |
516 | .pre_restore = acpi_pm_freeze, | |
517 | .restore_cleanup = acpi_pm_thaw, | |
518 | }; | |
519 | ||
520 | /** | |
521 | * acpi_hibernation_begin_old - Set the target system sleep state to | |
522 | * ACPI_STATE_S4 and execute the _PTS control method. This | |
523 | * function is used if the pre-ACPI 2.0 suspend ordering has been | |
524 | * requested. | |
525 | */ | |
526 | static int acpi_hibernation_begin_old(void) | |
527 | { | |
528 | int error; | |
529 | /* | |
530 | * The _TTS object should always be evaluated before the _PTS object. | |
531 | * When the old_suspended_ordering is true, the _PTS object is | |
532 | * evaluated in the acpi_sleep_prepare. | |
533 | */ | |
534 | acpi_sleep_tts_switch(ACPI_STATE_S4); | |
535 | ||
536 | error = acpi_sleep_prepare(ACPI_STATE_S4); | |
537 | ||
538 | if (!error) { | |
539 | if (!nvs_nosave) | |
540 | error = suspend_nvs_alloc(); | |
541 | if (!error) | |
542 | acpi_target_sleep_state = ACPI_STATE_S4; | |
543 | } | |
544 | return error; | |
545 | } | |
546 | ||
547 | /* | |
548 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
549 | * been requested. | |
550 | */ | |
551 | static const struct platform_hibernation_ops acpi_hibernation_ops_old = { | |
552 | .begin = acpi_hibernation_begin_old, | |
553 | .end = acpi_pm_end, | |
554 | .pre_snapshot = acpi_pm_pre_suspend, | |
555 | .prepare = acpi_pm_freeze, | |
556 | .finish = acpi_pm_finish, | |
557 | .enter = acpi_hibernation_enter, | |
558 | .leave = acpi_hibernation_leave, | |
559 | .pre_restore = acpi_pm_freeze, | |
560 | .restore_cleanup = acpi_pm_thaw, | |
561 | .recover = acpi_pm_finish, | |
562 | }; | |
563 | #endif /* CONFIG_HIBERNATION */ | |
564 | ||
565 | int acpi_suspend(u32 acpi_state) | |
566 | { | |
567 | suspend_state_t states[] = { | |
568 | [1] = PM_SUSPEND_STANDBY, | |
569 | [3] = PM_SUSPEND_MEM, | |
570 | [5] = PM_SUSPEND_MAX | |
571 | }; | |
572 | ||
573 | if (acpi_state < 6 && states[acpi_state]) | |
574 | return pm_suspend(states[acpi_state]); | |
575 | if (acpi_state == 4) | |
576 | return hibernate(); | |
577 | return -EINVAL; | |
578 | } | |
579 | ||
580 | #ifdef CONFIG_PM_OPS | |
581 | /** | |
582 | * acpi_pm_device_sleep_state - return preferred power state of ACPI device | |
583 | * in the system sleep state given by %acpi_target_sleep_state | |
584 | * @dev: device to examine; its driver model wakeup flags control | |
585 | * whether it should be able to wake up the system | |
586 | * @d_min_p: used to store the upper limit of allowed states range | |
587 | * Return value: preferred power state of the device on success, -ENODEV on | |
588 | * failure (ie. if there's no 'struct acpi_device' for @dev) | |
589 | * | |
590 | * Find the lowest power (highest number) ACPI device power state that | |
591 | * device @dev can be in while the system is in the sleep state represented | |
592 | * by %acpi_target_sleep_state. If @wake is nonzero, the device should be | |
593 | * able to wake up the system from this sleep state. If @d_min_p is set, | |
594 | * the highest power (lowest number) device power state of @dev allowed | |
595 | * in this system sleep state is stored at the location pointed to by it. | |
596 | * | |
597 | * The caller must ensure that @dev is valid before using this function. | |
598 | * The caller is also responsible for figuring out if the device is | |
599 | * supposed to be able to wake up the system and passing this information | |
600 | * via @wake. | |
601 | */ | |
602 | ||
603 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) | |
604 | { | |
605 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); | |
606 | struct acpi_device *adev; | |
607 | char acpi_method[] = "_SxD"; | |
608 | unsigned long long d_min, d_max; | |
609 | ||
610 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
611 | printk(KERN_DEBUG "ACPI handle has no context!\n"); | |
612 | return -ENODEV; | |
613 | } | |
614 | ||
615 | acpi_method[2] = '0' + acpi_target_sleep_state; | |
616 | /* | |
617 | * If the sleep state is S0, we will return D3, but if the device has | |
618 | * _S0W, we will use the value from _S0W | |
619 | */ | |
620 | d_min = ACPI_STATE_D0; | |
621 | d_max = ACPI_STATE_D3; | |
622 | ||
623 | /* | |
624 | * If present, _SxD methods return the minimum D-state (highest power | |
625 | * state) we can use for the corresponding S-states. Otherwise, the | |
626 | * minimum D-state is D0 (ACPI 3.x). | |
627 | * | |
628 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer | |
629 | * provided -- that's our fault recovery, we ignore retval. | |
630 | */ | |
631 | if (acpi_target_sleep_state > ACPI_STATE_S0) | |
632 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); | |
633 | ||
634 | /* | |
635 | * If _PRW says we can wake up the system from the target sleep state, | |
636 | * the D-state returned by _SxD is sufficient for that (we assume a | |
637 | * wakeup-aware driver if wake is set). Still, if _SxW exists | |
638 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that | |
639 | * can wake the system. _S0W may be valid, too. | |
640 | */ | |
641 | if (acpi_target_sleep_state == ACPI_STATE_S0 || | |
642 | (device_may_wakeup(dev) && | |
643 | adev->wakeup.sleep_state <= acpi_target_sleep_state)) { | |
644 | acpi_status status; | |
645 | ||
646 | acpi_method[3] = 'W'; | |
647 | status = acpi_evaluate_integer(handle, acpi_method, NULL, | |
648 | &d_max); | |
649 | if (ACPI_FAILURE(status)) { | |
650 | if (acpi_target_sleep_state != ACPI_STATE_S0 || | |
651 | status != AE_NOT_FOUND) | |
652 | d_max = d_min; | |
653 | } else if (d_max < d_min) { | |
654 | /* Warn the user of the broken DSDT */ | |
655 | printk(KERN_WARNING "ACPI: Wrong value from %s\n", | |
656 | acpi_method); | |
657 | /* Sanitize it */ | |
658 | d_min = d_max; | |
659 | } | |
660 | } | |
661 | ||
662 | if (d_min_p) | |
663 | *d_min_p = d_min; | |
664 | return d_max; | |
665 | } | |
666 | #endif /* CONFIG_PM_OPS */ | |
667 | ||
668 | #ifdef CONFIG_PM_SLEEP | |
669 | /** | |
670 | * acpi_pm_device_sleep_wake - enable or disable the system wake-up | |
671 | * capability of given device | |
672 | * @dev: device to handle | |
673 | * @enable: 'true' - enable, 'false' - disable the wake-up capability | |
674 | */ | |
675 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) | |
676 | { | |
677 | acpi_handle handle; | |
678 | struct acpi_device *adev; | |
679 | int error; | |
680 | ||
681 | if (!device_can_wakeup(dev)) | |
682 | return -EINVAL; | |
683 | ||
684 | handle = DEVICE_ACPI_HANDLE(dev); | |
685 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { | |
686 | dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); | |
687 | return -ENODEV; | |
688 | } | |
689 | ||
690 | error = enable ? | |
691 | acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : | |
692 | acpi_disable_wakeup_device_power(adev); | |
693 | if (!error) | |
694 | dev_info(dev, "wake-up capability %s by ACPI\n", | |
695 | enable ? "enabled" : "disabled"); | |
696 | ||
697 | return error; | |
698 | } | |
699 | #endif /* CONFIG_PM_SLEEP */ | |
700 | ||
701 | static void acpi_power_off_prepare(void) | |
702 | { | |
703 | /* Prepare to power off the system */ | |
704 | acpi_sleep_prepare(ACPI_STATE_S5); | |
705 | acpi_disable_all_gpes(); | |
706 | } | |
707 | ||
708 | static void acpi_power_off(void) | |
709 | { | |
710 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ | |
711 | printk(KERN_DEBUG "%s called\n", __func__); | |
712 | local_irq_disable(); | |
713 | acpi_enter_sleep_state(ACPI_STATE_S5); | |
714 | } | |
715 | ||
716 | /* | |
717 | * ACPI 2.0 created the optional _GTS and _BFS, | |
718 | * but industry adoption has been neither rapid nor broad. | |
719 | * | |
720 | * Linux gets into trouble when it executes poorly validated | |
721 | * paths through the BIOS, so disable _GTS and _BFS by default, | |
722 | * but do speak up and offer the option to enable them. | |
723 | */ | |
724 | static void __init acpi_gts_bfs_check(void) | |
725 | { | |
726 | acpi_handle dummy; | |
727 | ||
728 | if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) | |
729 | { | |
730 | printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); | |
731 | printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " | |
732 | "please notify linux-acpi@vger.kernel.org\n"); | |
733 | } | |
734 | if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) | |
735 | { | |
736 | printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); | |
737 | printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " | |
738 | "please notify linux-acpi@vger.kernel.org\n"); | |
739 | } | |
740 | } | |
741 | ||
742 | int __init acpi_sleep_init(void) | |
743 | { | |
744 | acpi_status status; | |
745 | u8 type_a, type_b; | |
746 | #ifdef CONFIG_SUSPEND | |
747 | int i = 0; | |
748 | ||
749 | dmi_check_system(acpisleep_dmi_table); | |
750 | #endif | |
751 | ||
752 | if (acpi_disabled) | |
753 | return 0; | |
754 | ||
755 | sleep_states[ACPI_STATE_S0] = 1; | |
756 | printk(KERN_INFO PREFIX "(supports S0"); | |
757 | ||
758 | #ifdef CONFIG_SUSPEND | |
759 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { | |
760 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); | |
761 | if (ACPI_SUCCESS(status)) { | |
762 | sleep_states[i] = 1; | |
763 | printk(" S%d", i); | |
764 | } | |
765 | } | |
766 | ||
767 | suspend_set_ops(old_suspend_ordering ? | |
768 | &acpi_suspend_ops_old : &acpi_suspend_ops); | |
769 | #endif | |
770 | ||
771 | #ifdef CONFIG_HIBERNATION | |
772 | status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); | |
773 | if (ACPI_SUCCESS(status)) { | |
774 | hibernation_set_ops(old_suspend_ordering ? | |
775 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); | |
776 | sleep_states[ACPI_STATE_S4] = 1; | |
777 | printk(" S4"); | |
778 | if (!nosigcheck) { | |
779 | acpi_get_table(ACPI_SIG_FACS, 1, | |
780 | (struct acpi_table_header **)&facs); | |
781 | if (facs) | |
782 | s4_hardware_signature = | |
783 | facs->hardware_signature; | |
784 | } | |
785 | } | |
786 | #endif | |
787 | status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); | |
788 | if (ACPI_SUCCESS(status)) { | |
789 | sleep_states[ACPI_STATE_S5] = 1; | |
790 | printk(" S5"); | |
791 | pm_power_off_prepare = acpi_power_off_prepare; | |
792 | pm_power_off = acpi_power_off; | |
793 | } | |
794 | printk(")\n"); | |
795 | /* | |
796 | * Register the tts_notifier to reboot notifier list so that the _TTS | |
797 | * object can also be evaluated when the system enters S5. | |
798 | */ | |
799 | register_reboot_notifier(&tts_notifier); | |
800 | acpi_gts_bfs_check(); | |
801 | return 0; | |
802 | } |