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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 | #include <linux/acpi.h> |
20 | #include <linux/module.h> |
21 | |
22 | #include <asm/io.h> |
23 | |
24 | #include <acpi/acpi_bus.h> |
25 | #include <acpi/acpi_drivers.h> |
26 | |
27 | #include "internal.h" |
28 | #include "sleep.h" |
29 | |
30 | static u8 sleep_states[ACPI_S_STATE_COUNT]; |
31 | |
32 | static void acpi_sleep_tts_switch(u32 acpi_state) |
33 | { |
34 | union acpi_object in_arg = { ACPI_TYPE_INTEGER }; |
35 | struct acpi_object_list arg_list = { 1, &in_arg }; |
36 | acpi_status status = AE_OK; |
37 | |
38 | in_arg.integer.value = acpi_state; |
39 | status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); |
40 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
41 | /* |
42 | * OS can't evaluate the _TTS object correctly. Some warning |
43 | * message will be printed. But it won't break anything. |
44 | */ |
45 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); |
46 | } |
47 | } |
48 | |
49 | static int tts_notify_reboot(struct notifier_block *this, |
50 | unsigned long code, void *x) |
51 | { |
52 | acpi_sleep_tts_switch(ACPI_STATE_S5); |
53 | return NOTIFY_DONE; |
54 | } |
55 | |
56 | static struct notifier_block tts_notifier = { |
57 | .notifier_call = tts_notify_reboot, |
58 | .next = NULL, |
59 | .priority = 0, |
60 | }; |
61 | |
62 | static int acpi_sleep_prepare(u32 acpi_state) |
63 | { |
64 | #ifdef CONFIG_ACPI_SLEEP |
65 | /* do we have a wakeup address for S2 and S3? */ |
66 | if (acpi_state == ACPI_STATE_S3) { |
67 | if (!acpi_wakeup_address) |
68 | return -EFAULT; |
69 | acpi_set_firmware_waking_vector(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 | u32 acpi_target_system_state(void) |
85 | { |
86 | return acpi_target_sleep_state; |
87 | } |
88 | |
89 | static bool pwr_btn_event_pending; |
90 | |
91 | /* |
92 | * The ACPI specification wants us to save NVS memory regions during hibernation |
93 | * and to restore them during the subsequent resume. Windows does that also for |
94 | * suspend to RAM. However, it is known that this mechanism does not work on |
95 | * all machines, so we allow the user to disable it with the help of the |
96 | * 'acpi_sleep=nonvs' kernel command line option. |
97 | */ |
98 | static bool nvs_nosave; |
99 | |
100 | void __init acpi_nvs_nosave(void) |
101 | { |
102 | nvs_nosave = true; |
103 | } |
104 | |
105 | /* |
106 | * The ACPI specification wants us to save NVS memory regions during hibernation |
107 | * but says nothing about saving NVS during S3. Not all versions of Windows |
108 | * save NVS on S3 suspend either, and it is clear that not all systems need |
109 | * NVS to be saved at S3 time. To improve suspend/resume time, allow the |
110 | * user to disable saving NVS on S3 if their system does not require it, but |
111 | * continue to save/restore NVS for S4 as specified. |
112 | */ |
113 | static bool nvs_nosave_s3; |
114 | |
115 | void __init acpi_nvs_nosave_s3(void) |
116 | { |
117 | nvs_nosave_s3 = true; |
118 | } |
119 | |
120 | /* |
121 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the |
122 | * user to request that behavior by using the 'acpi_old_suspend_ordering' |
123 | * kernel command line option that causes the following variable to be set. |
124 | */ |
125 | static bool old_suspend_ordering; |
126 | |
127 | void __init acpi_old_suspend_ordering(void) |
128 | { |
129 | old_suspend_ordering = true; |
130 | } |
131 | |
132 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) |
133 | { |
134 | acpi_old_suspend_ordering(); |
135 | return 0; |
136 | } |
137 | |
138 | static int __init init_nvs_nosave(const struct dmi_system_id *d) |
139 | { |
140 | acpi_nvs_nosave(); |
141 | return 0; |
142 | } |
143 | |
144 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { |
145 | { |
146 | .callback = init_old_suspend_ordering, |
147 | .ident = "Abit KN9 (nForce4 variant)", |
148 | .matches = { |
149 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), |
150 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), |
151 | }, |
152 | }, |
153 | { |
154 | .callback = init_old_suspend_ordering, |
155 | .ident = "HP xw4600 Workstation", |
156 | .matches = { |
157 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
158 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), |
159 | }, |
160 | }, |
161 | { |
162 | .callback = init_old_suspend_ordering, |
163 | .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", |
164 | .matches = { |
165 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), |
166 | DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), |
167 | }, |
168 | }, |
169 | { |
170 | .callback = init_old_suspend_ordering, |
171 | .ident = "Panasonic CF51-2L", |
172 | .matches = { |
173 | DMI_MATCH(DMI_BOARD_VENDOR, |
174 | "Matsushita Electric Industrial Co.,Ltd."), |
175 | DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), |
176 | }, |
177 | }, |
178 | { |
179 | .callback = init_nvs_nosave, |
180 | .ident = "Sony Vaio VGN-FW41E_H", |
181 | .matches = { |
182 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
183 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"), |
184 | }, |
185 | }, |
186 | { |
187 | .callback = init_nvs_nosave, |
188 | .ident = "Sony Vaio VGN-FW21E", |
189 | .matches = { |
190 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
191 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), |
192 | }, |
193 | }, |
194 | { |
195 | .callback = init_nvs_nosave, |
196 | .ident = "Sony Vaio VGN-FW21M", |
197 | .matches = { |
198 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
199 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"), |
200 | }, |
201 | }, |
202 | { |
203 | .callback = init_nvs_nosave, |
204 | .ident = "Sony Vaio VPCEB17FX", |
205 | .matches = { |
206 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
207 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), |
208 | }, |
209 | }, |
210 | { |
211 | .callback = init_nvs_nosave, |
212 | .ident = "Sony Vaio VGN-SR11M", |
213 | .matches = { |
214 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
215 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), |
216 | }, |
217 | }, |
218 | { |
219 | .callback = init_nvs_nosave, |
220 | .ident = "Everex StepNote Series", |
221 | .matches = { |
222 | DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), |
223 | DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), |
224 | }, |
225 | }, |
226 | { |
227 | .callback = init_nvs_nosave, |
228 | .ident = "Sony Vaio VPCEB1Z1E", |
229 | .matches = { |
230 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
231 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), |
232 | }, |
233 | }, |
234 | { |
235 | .callback = init_nvs_nosave, |
236 | .ident = "Sony Vaio VGN-NW130D", |
237 | .matches = { |
238 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
239 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), |
240 | }, |
241 | }, |
242 | { |
243 | .callback = init_nvs_nosave, |
244 | .ident = "Sony Vaio VPCCW29FX", |
245 | .matches = { |
246 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
247 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), |
248 | }, |
249 | }, |
250 | { |
251 | .callback = init_nvs_nosave, |
252 | .ident = "Averatec AV1020-ED2", |
253 | .matches = { |
254 | DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), |
255 | DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), |
256 | }, |
257 | }, |
258 | { |
259 | .callback = init_old_suspend_ordering, |
260 | .ident = "Asus A8N-SLI DELUXE", |
261 | .matches = { |
262 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), |
263 | DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), |
264 | }, |
265 | }, |
266 | { |
267 | .callback = init_old_suspend_ordering, |
268 | .ident = "Asus A8N-SLI Premium", |
269 | .matches = { |
270 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), |
271 | DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), |
272 | }, |
273 | }, |
274 | { |
275 | .callback = init_nvs_nosave, |
276 | .ident = "Sony Vaio VGN-SR26GN_P", |
277 | .matches = { |
278 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
279 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), |
280 | }, |
281 | }, |
282 | { |
283 | .callback = init_nvs_nosave, |
284 | .ident = "Sony Vaio VPCEB1S1E", |
285 | .matches = { |
286 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
287 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"), |
288 | }, |
289 | }, |
290 | { |
291 | .callback = init_nvs_nosave, |
292 | .ident = "Sony Vaio VGN-FW520F", |
293 | .matches = { |
294 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), |
295 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), |
296 | }, |
297 | }, |
298 | { |
299 | .callback = init_nvs_nosave, |
300 | .ident = "Asus K54C", |
301 | .matches = { |
302 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
303 | DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), |
304 | }, |
305 | }, |
306 | { |
307 | .callback = init_nvs_nosave, |
308 | .ident = "Asus K54HR", |
309 | .matches = { |
310 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), |
311 | DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), |
312 | }, |
313 | }, |
314 | {}, |
315 | }; |
316 | |
317 | static void acpi_sleep_dmi_check(void) |
318 | { |
319 | dmi_check_system(acpisleep_dmi_table); |
320 | } |
321 | |
322 | /** |
323 | * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. |
324 | */ |
325 | static int acpi_pm_freeze(void) |
326 | { |
327 | acpi_disable_all_gpes(); |
328 | acpi_os_wait_events_complete(); |
329 | acpi_ec_block_transactions(); |
330 | return 0; |
331 | } |
332 | |
333 | /** |
334 | * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. |
335 | */ |
336 | static int acpi_pm_pre_suspend(void) |
337 | { |
338 | acpi_pm_freeze(); |
339 | return suspend_nvs_save(); |
340 | } |
341 | |
342 | /** |
343 | * __acpi_pm_prepare - Prepare the platform to enter the target state. |
344 | * |
345 | * If necessary, set the firmware waking vector and do arch-specific |
346 | * nastiness to get the wakeup code to the waking vector. |
347 | */ |
348 | static int __acpi_pm_prepare(void) |
349 | { |
350 | int error = acpi_sleep_prepare(acpi_target_sleep_state); |
351 | if (error) |
352 | acpi_target_sleep_state = ACPI_STATE_S0; |
353 | |
354 | return error; |
355 | } |
356 | |
357 | /** |
358 | * acpi_pm_prepare - Prepare the platform to enter the target sleep |
359 | * state and disable the GPEs. |
360 | */ |
361 | static int acpi_pm_prepare(void) |
362 | { |
363 | int error = __acpi_pm_prepare(); |
364 | if (!error) |
365 | error = acpi_pm_pre_suspend(); |
366 | |
367 | return error; |
368 | } |
369 | |
370 | static int find_powerf_dev(struct device *dev, void *data) |
371 | { |
372 | struct acpi_device *device = to_acpi_device(dev); |
373 | const char *hid = acpi_device_hid(device); |
374 | |
375 | return !strcmp(hid, ACPI_BUTTON_HID_POWERF); |
376 | } |
377 | |
378 | /** |
379 | * acpi_pm_finish - Instruct the platform to leave a sleep state. |
380 | * |
381 | * This is called after we wake back up (or if entering the sleep state |
382 | * failed). |
383 | */ |
384 | static void acpi_pm_finish(void) |
385 | { |
386 | struct device *pwr_btn_dev; |
387 | u32 acpi_state = acpi_target_sleep_state; |
388 | |
389 | acpi_ec_unblock_transactions(); |
390 | suspend_nvs_free(); |
391 | |
392 | if (acpi_state == ACPI_STATE_S0) |
393 | return; |
394 | |
395 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", |
396 | acpi_state); |
397 | acpi_disable_wakeup_devices(acpi_state); |
398 | acpi_leave_sleep_state(acpi_state); |
399 | |
400 | /* reset firmware waking vector */ |
401 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); |
402 | |
403 | acpi_target_sleep_state = ACPI_STATE_S0; |
404 | |
405 | acpi_resume_power_resources(); |
406 | |
407 | /* If we were woken with the fixed power button, provide a small |
408 | * hint to userspace in the form of a wakeup event on the fixed power |
409 | * button device (if it can be found). |
410 | * |
411 | * We delay the event generation til now, as the PM layer requires |
412 | * timekeeping to be running before we generate events. */ |
413 | if (!pwr_btn_event_pending) |
414 | return; |
415 | |
416 | pwr_btn_event_pending = false; |
417 | pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL, |
418 | find_powerf_dev); |
419 | if (pwr_btn_dev) { |
420 | pm_wakeup_event(pwr_btn_dev, 0); |
421 | put_device(pwr_btn_dev); |
422 | } |
423 | } |
424 | |
425 | /** |
426 | * acpi_pm_end - Finish up suspend sequence. |
427 | */ |
428 | static void acpi_pm_end(void) |
429 | { |
430 | /* |
431 | * This is necessary in case acpi_pm_finish() is not called during a |
432 | * failing transition to a sleep state. |
433 | */ |
434 | acpi_target_sleep_state = ACPI_STATE_S0; |
435 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
436 | } |
437 | #else /* !CONFIG_ACPI_SLEEP */ |
438 | #define acpi_target_sleep_state ACPI_STATE_S0 |
439 | static inline void acpi_sleep_dmi_check(void) {} |
440 | #endif /* CONFIG_ACPI_SLEEP */ |
441 | |
442 | #ifdef CONFIG_SUSPEND |
443 | static u32 acpi_suspend_states[] = { |
444 | [PM_SUSPEND_ON] = ACPI_STATE_S0, |
445 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, |
446 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, |
447 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 |
448 | }; |
449 | |
450 | /** |
451 | * acpi_suspend_begin - Set the target system sleep state to the state |
452 | * associated with given @pm_state, if supported. |
453 | */ |
454 | static int acpi_suspend_begin(suspend_state_t pm_state) |
455 | { |
456 | u32 acpi_state = acpi_suspend_states[pm_state]; |
457 | int error = 0; |
458 | |
459 | error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); |
460 | if (error) |
461 | return error; |
462 | |
463 | if (sleep_states[acpi_state]) { |
464 | acpi_target_sleep_state = acpi_state; |
465 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
466 | } else { |
467 | printk(KERN_ERR "ACPI does not support this state: %d\n", |
468 | pm_state); |
469 | error = -ENOSYS; |
470 | } |
471 | return error; |
472 | } |
473 | |
474 | /** |
475 | * acpi_suspend_enter - Actually enter a sleep state. |
476 | * @pm_state: ignored |
477 | * |
478 | * Flush caches and go to sleep. For STR we have to call arch-specific |
479 | * assembly, which in turn call acpi_enter_sleep_state(). |
480 | * It's unfortunate, but it works. Please fix if you're feeling frisky. |
481 | */ |
482 | static int acpi_suspend_enter(suspend_state_t pm_state) |
483 | { |
484 | acpi_status status = AE_OK; |
485 | u32 acpi_state = acpi_target_sleep_state; |
486 | int error; |
487 | |
488 | ACPI_FLUSH_CPU_CACHE(); |
489 | |
490 | switch (acpi_state) { |
491 | case ACPI_STATE_S1: |
492 | barrier(); |
493 | status = acpi_enter_sleep_state(acpi_state); |
494 | break; |
495 | |
496 | case ACPI_STATE_S3: |
497 | error = acpi_suspend_lowlevel(); |
498 | if (error) |
499 | return error; |
500 | pr_info(PREFIX "Low-level resume complete\n"); |
501 | break; |
502 | } |
503 | |
504 | /* This violates the spec but is required for bug compatibility. */ |
505 | acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); |
506 | |
507 | /* Reprogram control registers */ |
508 | acpi_leave_sleep_state_prep(acpi_state); |
509 | |
510 | /* ACPI 3.0 specs (P62) says that it's the responsibility |
511 | * of the OSPM to clear the status bit [ implying that the |
512 | * POWER_BUTTON event should not reach userspace ] |
513 | * |
514 | * However, we do generate a small hint for userspace in the form of |
515 | * a wakeup event. We flag this condition for now and generate the |
516 | * event later, as we're currently too early in resume to be able to |
517 | * generate wakeup events. |
518 | */ |
519 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) { |
520 | acpi_event_status pwr_btn_status; |
521 | |
522 | acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status); |
523 | |
524 | if (pwr_btn_status & ACPI_EVENT_FLAG_SET) { |
525 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); |
526 | /* Flag for later */ |
527 | pwr_btn_event_pending = true; |
528 | } |
529 | } |
530 | |
531 | /* |
532 | * Disable and clear GPE status before interrupt is enabled. Some GPEs |
533 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. |
534 | * acpi_leave_sleep_state will reenable specific GPEs later |
535 | */ |
536 | acpi_disable_all_gpes(); |
537 | /* Allow EC transactions to happen. */ |
538 | acpi_ec_unblock_transactions_early(); |
539 | |
540 | suspend_nvs_restore(); |
541 | |
542 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
543 | } |
544 | |
545 | static int acpi_suspend_state_valid(suspend_state_t pm_state) |
546 | { |
547 | u32 acpi_state; |
548 | |
549 | switch (pm_state) { |
550 | case PM_SUSPEND_ON: |
551 | case PM_SUSPEND_STANDBY: |
552 | case PM_SUSPEND_MEM: |
553 | acpi_state = acpi_suspend_states[pm_state]; |
554 | |
555 | return sleep_states[acpi_state]; |
556 | default: |
557 | return 0; |
558 | } |
559 | } |
560 | |
561 | static const struct platform_suspend_ops acpi_suspend_ops = { |
562 | .valid = acpi_suspend_state_valid, |
563 | .begin = acpi_suspend_begin, |
564 | .prepare_late = acpi_pm_prepare, |
565 | .enter = acpi_suspend_enter, |
566 | .wake = acpi_pm_finish, |
567 | .end = acpi_pm_end, |
568 | }; |
569 | |
570 | /** |
571 | * acpi_suspend_begin_old - Set the target system sleep state to the |
572 | * state associated with given @pm_state, if supported, and |
573 | * execute the _PTS control method. This function is used if the |
574 | * pre-ACPI 2.0 suspend ordering has been requested. |
575 | */ |
576 | static int acpi_suspend_begin_old(suspend_state_t pm_state) |
577 | { |
578 | int error = acpi_suspend_begin(pm_state); |
579 | if (!error) |
580 | error = __acpi_pm_prepare(); |
581 | |
582 | return error; |
583 | } |
584 | |
585 | /* |
586 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has |
587 | * been requested. |
588 | */ |
589 | static const struct platform_suspend_ops acpi_suspend_ops_old = { |
590 | .valid = acpi_suspend_state_valid, |
591 | .begin = acpi_suspend_begin_old, |
592 | .prepare_late = acpi_pm_pre_suspend, |
593 | .enter = acpi_suspend_enter, |
594 | .wake = acpi_pm_finish, |
595 | .end = acpi_pm_end, |
596 | .recover = acpi_pm_finish, |
597 | }; |
598 | |
599 | static void acpi_sleep_suspend_setup(void) |
600 | { |
601 | int i; |
602 | |
603 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { |
604 | acpi_status status; |
605 | u8 type_a, type_b; |
606 | |
607 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); |
608 | if (ACPI_SUCCESS(status)) { |
609 | sleep_states[i] = 1; |
610 | } |
611 | } |
612 | |
613 | suspend_set_ops(old_suspend_ordering ? |
614 | &acpi_suspend_ops_old : &acpi_suspend_ops); |
615 | } |
616 | #else /* !CONFIG_SUSPEND */ |
617 | static inline void acpi_sleep_suspend_setup(void) {} |
618 | #endif /* !CONFIG_SUSPEND */ |
619 | |
620 | #ifdef CONFIG_HIBERNATION |
621 | static unsigned long s4_hardware_signature; |
622 | static struct acpi_table_facs *facs; |
623 | static bool nosigcheck; |
624 | |
625 | void __init acpi_no_s4_hw_signature(void) |
626 | { |
627 | nosigcheck = true; |
628 | } |
629 | |
630 | static int acpi_hibernation_begin(void) |
631 | { |
632 | int error; |
633 | |
634 | error = nvs_nosave ? 0 : suspend_nvs_alloc(); |
635 | if (!error) { |
636 | acpi_target_sleep_state = ACPI_STATE_S4; |
637 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
638 | } |
639 | |
640 | return error; |
641 | } |
642 | |
643 | static int acpi_hibernation_enter(void) |
644 | { |
645 | acpi_status status = AE_OK; |
646 | |
647 | ACPI_FLUSH_CPU_CACHE(); |
648 | |
649 | /* This shouldn't return. If it returns, we have a problem */ |
650 | status = acpi_enter_sleep_state(ACPI_STATE_S4); |
651 | /* Reprogram control registers */ |
652 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); |
653 | |
654 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
655 | } |
656 | |
657 | static void acpi_hibernation_leave(void) |
658 | { |
659 | /* |
660 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to |
661 | * enable it here. |
662 | */ |
663 | acpi_enable(); |
664 | /* Reprogram control registers */ |
665 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); |
666 | /* Check the hardware signature */ |
667 | if (facs && s4_hardware_signature != facs->hardware_signature) { |
668 | printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " |
669 | "cannot resume!\n"); |
670 | panic("ACPI S4 hardware signature mismatch"); |
671 | } |
672 | /* Restore the NVS memory area */ |
673 | suspend_nvs_restore(); |
674 | /* Allow EC transactions to happen. */ |
675 | acpi_ec_unblock_transactions_early(); |
676 | } |
677 | |
678 | static void acpi_pm_thaw(void) |
679 | { |
680 | acpi_ec_unblock_transactions(); |
681 | acpi_enable_all_runtime_gpes(); |
682 | } |
683 | |
684 | static const struct platform_hibernation_ops acpi_hibernation_ops = { |
685 | .begin = acpi_hibernation_begin, |
686 | .end = acpi_pm_end, |
687 | .pre_snapshot = acpi_pm_prepare, |
688 | .finish = acpi_pm_finish, |
689 | .prepare = acpi_pm_prepare, |
690 | .enter = acpi_hibernation_enter, |
691 | .leave = acpi_hibernation_leave, |
692 | .pre_restore = acpi_pm_freeze, |
693 | .restore_cleanup = acpi_pm_thaw, |
694 | }; |
695 | |
696 | /** |
697 | * acpi_hibernation_begin_old - Set the target system sleep state to |
698 | * ACPI_STATE_S4 and execute the _PTS control method. This |
699 | * function is used if the pre-ACPI 2.0 suspend ordering has been |
700 | * requested. |
701 | */ |
702 | static int acpi_hibernation_begin_old(void) |
703 | { |
704 | int error; |
705 | /* |
706 | * The _TTS object should always be evaluated before the _PTS object. |
707 | * When the old_suspended_ordering is true, the _PTS object is |
708 | * evaluated in the acpi_sleep_prepare. |
709 | */ |
710 | acpi_sleep_tts_switch(ACPI_STATE_S4); |
711 | |
712 | error = acpi_sleep_prepare(ACPI_STATE_S4); |
713 | |
714 | if (!error) { |
715 | if (!nvs_nosave) |
716 | error = suspend_nvs_alloc(); |
717 | if (!error) |
718 | acpi_target_sleep_state = ACPI_STATE_S4; |
719 | } |
720 | return error; |
721 | } |
722 | |
723 | /* |
724 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has |
725 | * been requested. |
726 | */ |
727 | static const struct platform_hibernation_ops acpi_hibernation_ops_old = { |
728 | .begin = acpi_hibernation_begin_old, |
729 | .end = acpi_pm_end, |
730 | .pre_snapshot = acpi_pm_pre_suspend, |
731 | .prepare = acpi_pm_freeze, |
732 | .finish = acpi_pm_finish, |
733 | .enter = acpi_hibernation_enter, |
734 | .leave = acpi_hibernation_leave, |
735 | .pre_restore = acpi_pm_freeze, |
736 | .restore_cleanup = acpi_pm_thaw, |
737 | .recover = acpi_pm_finish, |
738 | }; |
739 | |
740 | static void acpi_sleep_hibernate_setup(void) |
741 | { |
742 | acpi_status status; |
743 | u8 type_a, type_b; |
744 | |
745 | status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); |
746 | if (ACPI_FAILURE(status)) |
747 | return; |
748 | |
749 | hibernation_set_ops(old_suspend_ordering ? |
750 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); |
751 | sleep_states[ACPI_STATE_S4] = 1; |
752 | if (nosigcheck) |
753 | return; |
754 | |
755 | acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); |
756 | if (facs) |
757 | s4_hardware_signature = facs->hardware_signature; |
758 | } |
759 | #else /* !CONFIG_HIBERNATION */ |
760 | static inline void acpi_sleep_hibernate_setup(void) {} |
761 | #endif /* !CONFIG_HIBERNATION */ |
762 | |
763 | int acpi_suspend(u32 acpi_state) |
764 | { |
765 | suspend_state_t states[] = { |
766 | [1] = PM_SUSPEND_STANDBY, |
767 | [3] = PM_SUSPEND_MEM, |
768 | [5] = PM_SUSPEND_MAX |
769 | }; |
770 | |
771 | if (acpi_state < 6 && states[acpi_state]) |
772 | return pm_suspend(states[acpi_state]); |
773 | if (acpi_state == 4) |
774 | return hibernate(); |
775 | return -EINVAL; |
776 | } |
777 | |
778 | static void acpi_power_off_prepare(void) |
779 | { |
780 | /* Prepare to power off the system */ |
781 | acpi_sleep_prepare(ACPI_STATE_S5); |
782 | acpi_disable_all_gpes(); |
783 | } |
784 | |
785 | static void acpi_power_off(void) |
786 | { |
787 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ |
788 | printk(KERN_DEBUG "%s called\n", __func__); |
789 | local_irq_disable(); |
790 | acpi_enter_sleep_state(ACPI_STATE_S5); |
791 | } |
792 | |
793 | int __init acpi_sleep_init(void) |
794 | { |
795 | acpi_status status; |
796 | u8 type_a, type_b; |
797 | char supported[ACPI_S_STATE_COUNT * 3 + 1]; |
798 | char *pos = supported; |
799 | int i; |
800 | |
801 | if (acpi_disabled) |
802 | return 0; |
803 | |
804 | acpi_sleep_dmi_check(); |
805 | |
806 | sleep_states[ACPI_STATE_S0] = 1; |
807 | |
808 | acpi_sleep_suspend_setup(); |
809 | acpi_sleep_hibernate_setup(); |
810 | |
811 | status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); |
812 | if (ACPI_SUCCESS(status)) { |
813 | sleep_states[ACPI_STATE_S5] = 1; |
814 | pm_power_off_prepare = acpi_power_off_prepare; |
815 | pm_power_off = acpi_power_off; |
816 | } |
817 | |
818 | supported[0] = 0; |
819 | for (i = 0; i < ACPI_S_STATE_COUNT; i++) { |
820 | if (sleep_states[i]) |
821 | pos += sprintf(pos, " S%d", i); |
822 | } |
823 | pr_info(PREFIX "(supports%s)\n", supported); |
824 | |
825 | /* |
826 | * Register the tts_notifier to reboot notifier list so that the _TTS |
827 | * object can also be evaluated when the system enters S5. |
828 | */ |
829 | register_reboot_notifier(&tts_notifier); |
830 | return 0; |
831 | } |
832 |
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