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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#include <linux/pm_runtime.h>
22
23#include <asm/io.h>
24
25#include <acpi/acpi_bus.h>
26#include <acpi/acpi_drivers.h>
27
28#include "internal.h"
29#include "sleep.h"
30
31u8 wake_sleep_flags = ACPI_NO_OPTIONAL_METHODS;
32static unsigned int gts, bfs;
33static int set_param_wake_flag(const char *val, struct kernel_param *kp)
34{
35 int ret = param_set_int(val, kp);
36
37 if (ret)
38 return ret;
39
40 if (kp->arg == (const char *)>s) {
41 if (gts)
42 wake_sleep_flags |= ACPI_EXECUTE_GTS;
43 else
44 wake_sleep_flags &= ~ACPI_EXECUTE_GTS;
45 }
46 if (kp->arg == (const char *)&bfs) {
47 if (bfs)
48 wake_sleep_flags |= ACPI_EXECUTE_BFS;
49 else
50 wake_sleep_flags &= ~ACPI_EXECUTE_BFS;
51 }
52 return ret;
53}
54module_param_call(gts, set_param_wake_flag, param_get_int, >s, 0644);
55module_param_call(bfs, set_param_wake_flag, param_get_int, &bfs, 0644);
56MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
57MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
58
59static u8 sleep_states[ACPI_S_STATE_COUNT];
60static bool pwr_btn_event_pending;
61
62static void acpi_sleep_tts_switch(u32 acpi_state)
63{
64 union acpi_object in_arg = { ACPI_TYPE_INTEGER };
65 struct acpi_object_list arg_list = { 1, &in_arg };
66 acpi_status status = AE_OK;
67
68 in_arg.integer.value = acpi_state;
69 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
70 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
71 /*
72 * OS can't evaluate the _TTS object correctly. Some warning
73 * message will be printed. But it won't break anything.
74 */
75 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
76 }
77}
78
79static int tts_notify_reboot(struct notifier_block *this,
80 unsigned long code, void *x)
81{
82 acpi_sleep_tts_switch(ACPI_STATE_S5);
83 return NOTIFY_DONE;
84}
85
86static struct notifier_block tts_notifier = {
87 .notifier_call = tts_notify_reboot,
88 .next = NULL,
89 .priority = 0,
90};
91
92static int acpi_sleep_prepare(u32 acpi_state)
93{
94#ifdef CONFIG_ACPI_SLEEP
95 /* do we have a wakeup address for S2 and S3? */
96 if (acpi_state == ACPI_STATE_S3) {
97 if (!acpi_wakeup_address)
98 return -EFAULT;
99 acpi_set_firmware_waking_vector(acpi_wakeup_address);
100
101 }
102 ACPI_FLUSH_CPU_CACHE();
103#endif
104 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
105 acpi_state);
106 acpi_enable_wakeup_devices(acpi_state);
107 acpi_enter_sleep_state_prep(acpi_state);
108 return 0;
109}
110
111#ifdef CONFIG_ACPI_SLEEP
112static u32 acpi_target_sleep_state = ACPI_STATE_S0;
113
114/*
115 * The ACPI specification wants us to save NVS memory regions during hibernation
116 * and to restore them during the subsequent resume. Windows does that also for
117 * suspend to RAM. However, it is known that this mechanism does not work on
118 * all machines, so we allow the user to disable it with the help of the
119 * 'acpi_sleep=nonvs' kernel command line option.
120 */
121static bool nvs_nosave;
122
123void __init acpi_nvs_nosave(void)
124{
125 nvs_nosave = true;
126}
127
128/*
129 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
130 * user to request that behavior by using the 'acpi_old_suspend_ordering'
131 * kernel command line option that causes the following variable to be set.
132 */
133static bool old_suspend_ordering;
134
135void __init acpi_old_suspend_ordering(void)
136{
137 old_suspend_ordering = true;
138}
139
140/**
141 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
142 */
143static int acpi_pm_freeze(void)
144{
145 acpi_disable_all_gpes();
146 acpi_os_wait_events_complete(NULL);
147 acpi_ec_block_transactions();
148 return 0;
149}
150
151/**
152 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
153 */
154static int acpi_pm_pre_suspend(void)
155{
156 acpi_pm_freeze();
157 return suspend_nvs_save();
158}
159
160/**
161 * __acpi_pm_prepare - Prepare the platform to enter the target state.
162 *
163 * If necessary, set the firmware waking vector and do arch-specific
164 * nastiness to get the wakeup code to the waking vector.
165 */
166static int __acpi_pm_prepare(void)
167{
168 int error = acpi_sleep_prepare(acpi_target_sleep_state);
169 if (error)
170 acpi_target_sleep_state = ACPI_STATE_S0;
171
172 return error;
173}
174
175/**
176 * acpi_pm_prepare - Prepare the platform to enter the target sleep
177 * state and disable the GPEs.
178 */
179static int acpi_pm_prepare(void)
180{
181 int error = __acpi_pm_prepare();
182 if (!error)
183 error = acpi_pm_pre_suspend();
184
185 return error;
186}
187
188static int find_powerf_dev(struct device *dev, void *data)
189{
190 struct acpi_device *device = to_acpi_device(dev);
191 const char *hid = acpi_device_hid(device);
192
193 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
194}
195
196/**
197 * acpi_pm_finish - Instruct the platform to leave a sleep state.
198 *
199 * This is called after we wake back up (or if entering the sleep state
200 * failed).
201 */
202static void acpi_pm_finish(void)
203{
204 struct device *pwr_btn_dev;
205 u32 acpi_state = acpi_target_sleep_state;
206
207 acpi_ec_unblock_transactions();
208 suspend_nvs_free();
209
210 if (acpi_state == ACPI_STATE_S0)
211 return;
212
213 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
214 acpi_state);
215 acpi_disable_wakeup_devices(acpi_state);
216 acpi_leave_sleep_state(acpi_state);
217
218 /* reset firmware waking vector */
219 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
220
221 acpi_target_sleep_state = ACPI_STATE_S0;
222
223 /* If we were woken with the fixed power button, provide a small
224 * hint to userspace in the form of a wakeup event on the fixed power
225 * button device (if it can be found).
226 *
227 * We delay the event generation til now, as the PM layer requires
228 * timekeeping to be running before we generate events. */
229 if (!pwr_btn_event_pending)
230 return;
231
232 pwr_btn_event_pending = false;
233 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
234 find_powerf_dev);
235 if (pwr_btn_dev) {
236 pm_wakeup_event(pwr_btn_dev, 0);
237 put_device(pwr_btn_dev);
238 }
239}
240
241/**
242 * acpi_pm_end - Finish up suspend sequence.
243 */
244static void acpi_pm_end(void)
245{
246 /*
247 * This is necessary in case acpi_pm_finish() is not called during a
248 * failing transition to a sleep state.
249 */
250 acpi_target_sleep_state = ACPI_STATE_S0;
251 acpi_sleep_tts_switch(acpi_target_sleep_state);
252}
253#else /* !CONFIG_ACPI_SLEEP */
254#define acpi_target_sleep_state ACPI_STATE_S0
255#endif /* CONFIG_ACPI_SLEEP */
256
257#ifdef CONFIG_SUSPEND
258static u32 acpi_suspend_states[] = {
259 [PM_SUSPEND_ON] = ACPI_STATE_S0,
260 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
261 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
262 [PM_SUSPEND_MAX] = ACPI_STATE_S5
263};
264
265/**
266 * acpi_suspend_begin - Set the target system sleep state to the state
267 * associated with given @pm_state, if supported.
268 */
269static int acpi_suspend_begin(suspend_state_t pm_state)
270{
271 u32 acpi_state = acpi_suspend_states[pm_state];
272 int error = 0;
273
274 error = nvs_nosave ? 0 : suspend_nvs_alloc();
275 if (error)
276 return error;
277
278 if (sleep_states[acpi_state]) {
279 acpi_target_sleep_state = acpi_state;
280 acpi_sleep_tts_switch(acpi_target_sleep_state);
281 } else {
282 printk(KERN_ERR "ACPI does not support this state: %d\n",
283 pm_state);
284 error = -ENOSYS;
285 }
286 return error;
287}
288
289/**
290 * acpi_suspend_enter - Actually enter a sleep state.
291 * @pm_state: ignored
292 *
293 * Flush caches and go to sleep. For STR we have to call arch-specific
294 * assembly, which in turn call acpi_enter_sleep_state().
295 * It's unfortunate, but it works. Please fix if you're feeling frisky.
296 */
297static int acpi_suspend_enter(suspend_state_t pm_state)
298{
299 acpi_status status = AE_OK;
300 u32 acpi_state = acpi_target_sleep_state;
301 int error;
302
303 ACPI_FLUSH_CPU_CACHE();
304
305 switch (acpi_state) {
306 case ACPI_STATE_S1:
307 barrier();
308 status = acpi_enter_sleep_state(acpi_state, wake_sleep_flags);
309 break;
310
311 case ACPI_STATE_S3:
312 error = acpi_suspend_lowlevel();
313 if (error)
314 return error;
315 pr_info(PREFIX "Low-level resume complete\n");
316 break;
317 }
318
319 /* This violates the spec but is required for bug compatibility. */
320 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
321
322 /* Reprogram control registers and execute _BFS */
323 acpi_leave_sleep_state_prep(acpi_state, wake_sleep_flags);
324
325 /* ACPI 3.0 specs (P62) says that it's the responsibility
326 * of the OSPM to clear the status bit [ implying that the
327 * POWER_BUTTON event should not reach userspace ]
328 *
329 * However, we do generate a small hint for userspace in the form of
330 * a wakeup event. We flag this condition for now and generate the
331 * event later, as we're currently too early in resume to be able to
332 * generate wakeup events.
333 */
334 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
335 acpi_event_status pwr_btn_status;
336
337 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
338
339 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
340 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
341 /* Flag for later */
342 pwr_btn_event_pending = true;
343 }
344 }
345
346 /*
347 * Disable and clear GPE status before interrupt is enabled. Some GPEs
348 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
349 * acpi_leave_sleep_state will reenable specific GPEs later
350 */
351 acpi_disable_all_gpes();
352 /* Allow EC transactions to happen. */
353 acpi_ec_unblock_transactions_early();
354
355 suspend_nvs_restore();
356
357 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
358}
359
360static int acpi_suspend_state_valid(suspend_state_t pm_state)
361{
362 u32 acpi_state;
363
364 switch (pm_state) {
365 case PM_SUSPEND_ON:
366 case PM_SUSPEND_STANDBY:
367 case PM_SUSPEND_MEM:
368 acpi_state = acpi_suspend_states[pm_state];
369
370 return sleep_states[acpi_state];
371 default:
372 return 0;
373 }
374}
375
376static const struct platform_suspend_ops acpi_suspend_ops = {
377 .valid = acpi_suspend_state_valid,
378 .begin = acpi_suspend_begin,
379 .prepare_late = acpi_pm_prepare,
380 .enter = acpi_suspend_enter,
381 .wake = acpi_pm_finish,
382 .end = acpi_pm_end,
383};
384
385/**
386 * acpi_suspend_begin_old - Set the target system sleep state to the
387 * state associated with given @pm_state, if supported, and
388 * execute the _PTS control method. This function is used if the
389 * pre-ACPI 2.0 suspend ordering has been requested.
390 */
391static int acpi_suspend_begin_old(suspend_state_t pm_state)
392{
393 int error = acpi_suspend_begin(pm_state);
394 if (!error)
395 error = __acpi_pm_prepare();
396
397 return error;
398}
399
400/*
401 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
402 * been requested.
403 */
404static const struct platform_suspend_ops acpi_suspend_ops_old = {
405 .valid = acpi_suspend_state_valid,
406 .begin = acpi_suspend_begin_old,
407 .prepare_late = acpi_pm_pre_suspend,
408 .enter = acpi_suspend_enter,
409 .wake = acpi_pm_finish,
410 .end = acpi_pm_end,
411 .recover = acpi_pm_finish,
412};
413
414static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
415{
416 old_suspend_ordering = true;
417 return 0;
418}
419
420static int __init init_nvs_nosave(const struct dmi_system_id *d)
421{
422 acpi_nvs_nosave();
423 return 0;
424}
425
426static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
427 {
428 .callback = init_old_suspend_ordering,
429 .ident = "Abit KN9 (nForce4 variant)",
430 .matches = {
431 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
432 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
433 },
434 },
435 {
436 .callback = init_old_suspend_ordering,
437 .ident = "HP xw4600 Workstation",
438 .matches = {
439 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
440 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
441 },
442 },
443 {
444 .callback = init_old_suspend_ordering,
445 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
446 .matches = {
447 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
448 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
449 },
450 },
451 {
452 .callback = init_old_suspend_ordering,
453 .ident = "Panasonic CF51-2L",
454 .matches = {
455 DMI_MATCH(DMI_BOARD_VENDOR,
456 "Matsushita Electric Industrial Co.,Ltd."),
457 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
458 },
459 },
460 {
461 .callback = init_nvs_nosave,
462 .ident = "Sony Vaio VGN-FW21E",
463 .matches = {
464 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
465 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
466 },
467 },
468 {
469 .callback = init_nvs_nosave,
470 .ident = "Sony Vaio VPCEB17FX",
471 .matches = {
472 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
473 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
474 },
475 },
476 {
477 .callback = init_nvs_nosave,
478 .ident = "Sony Vaio VGN-SR11M",
479 .matches = {
480 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
481 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
482 },
483 },
484 {
485 .callback = init_nvs_nosave,
486 .ident = "Everex StepNote Series",
487 .matches = {
488 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
489 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
490 },
491 },
492 {
493 .callback = init_nvs_nosave,
494 .ident = "Sony Vaio VPCEB1Z1E",
495 .matches = {
496 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
497 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
498 },
499 },
500 {
501 .callback = init_nvs_nosave,
502 .ident = "Sony Vaio VGN-NW130D",
503 .matches = {
504 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
506 },
507 },
508 {
509 .callback = init_nvs_nosave,
510 .ident = "Sony Vaio VPCCW29FX",
511 .matches = {
512 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
513 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
514 },
515 },
516 {
517 .callback = init_nvs_nosave,
518 .ident = "Averatec AV1020-ED2",
519 .matches = {
520 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
521 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
522 },
523 },
524 {
525 .callback = init_old_suspend_ordering,
526 .ident = "Asus A8N-SLI DELUXE",
527 .matches = {
528 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
529 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
530 },
531 },
532 {
533 .callback = init_old_suspend_ordering,
534 .ident = "Asus A8N-SLI Premium",
535 .matches = {
536 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
537 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
538 },
539 },
540 {
541 .callback = init_nvs_nosave,
542 .ident = "Sony Vaio VGN-SR26GN_P",
543 .matches = {
544 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
545 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
546 },
547 },
548 {
549 .callback = init_nvs_nosave,
550 .ident = "Sony Vaio VGN-FW520F",
551 .matches = {
552 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
553 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
554 },
555 },
556 {
557 .callback = init_nvs_nosave,
558 .ident = "Asus K54C",
559 .matches = {
560 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
561 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
562 },
563 },
564 {
565 .callback = init_nvs_nosave,
566 .ident = "Asus K54HR",
567 .matches = {
568 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
569 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
570 },
571 },
572 {},
573};
574#endif /* CONFIG_SUSPEND */
575
576#ifdef CONFIG_HIBERNATION
577static unsigned long s4_hardware_signature;
578static struct acpi_table_facs *facs;
579static bool nosigcheck;
580
581void __init acpi_no_s4_hw_signature(void)
582{
583 nosigcheck = true;
584}
585
586static int acpi_hibernation_begin(void)
587{
588 int error;
589
590 error = nvs_nosave ? 0 : suspend_nvs_alloc();
591 if (!error) {
592 acpi_target_sleep_state = ACPI_STATE_S4;
593 acpi_sleep_tts_switch(acpi_target_sleep_state);
594 }
595
596 return error;
597}
598
599static int acpi_hibernation_enter(void)
600{
601 acpi_status status = AE_OK;
602
603 ACPI_FLUSH_CPU_CACHE();
604
605 /* This shouldn't return. If it returns, we have a problem */
606 status = acpi_enter_sleep_state(ACPI_STATE_S4, wake_sleep_flags);
607 /* Reprogram control registers and execute _BFS */
608 acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
609
610 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
611}
612
613static void acpi_hibernation_leave(void)
614{
615 /*
616 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
617 * enable it here.
618 */
619 acpi_enable();
620 /* Reprogram control registers and execute _BFS */
621 acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
622 /* Check the hardware signature */
623 if (facs && s4_hardware_signature != facs->hardware_signature) {
624 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
625 "cannot resume!\n");
626 panic("ACPI S4 hardware signature mismatch");
627 }
628 /* Restore the NVS memory area */
629 suspend_nvs_restore();
630 /* Allow EC transactions to happen. */
631 acpi_ec_unblock_transactions_early();
632}
633
634static void acpi_pm_thaw(void)
635{
636 acpi_ec_unblock_transactions();
637 acpi_enable_all_runtime_gpes();
638}
639
640static const struct platform_hibernation_ops acpi_hibernation_ops = {
641 .begin = acpi_hibernation_begin,
642 .end = acpi_pm_end,
643 .pre_snapshot = acpi_pm_prepare,
644 .finish = acpi_pm_finish,
645 .prepare = acpi_pm_prepare,
646 .enter = acpi_hibernation_enter,
647 .leave = acpi_hibernation_leave,
648 .pre_restore = acpi_pm_freeze,
649 .restore_cleanup = acpi_pm_thaw,
650};
651
652/**
653 * acpi_hibernation_begin_old - Set the target system sleep state to
654 * ACPI_STATE_S4 and execute the _PTS control method. This
655 * function is used if the pre-ACPI 2.0 suspend ordering has been
656 * requested.
657 */
658static int acpi_hibernation_begin_old(void)
659{
660 int error;
661 /*
662 * The _TTS object should always be evaluated before the _PTS object.
663 * When the old_suspended_ordering is true, the _PTS object is
664 * evaluated in the acpi_sleep_prepare.
665 */
666 acpi_sleep_tts_switch(ACPI_STATE_S4);
667
668 error = acpi_sleep_prepare(ACPI_STATE_S4);
669
670 if (!error) {
671 if (!nvs_nosave)
672 error = suspend_nvs_alloc();
673 if (!error)
674 acpi_target_sleep_state = ACPI_STATE_S4;
675 }
676 return error;
677}
678
679/*
680 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
681 * been requested.
682 */
683static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
684 .begin = acpi_hibernation_begin_old,
685 .end = acpi_pm_end,
686 .pre_snapshot = acpi_pm_pre_suspend,
687 .prepare = acpi_pm_freeze,
688 .finish = acpi_pm_finish,
689 .enter = acpi_hibernation_enter,
690 .leave = acpi_hibernation_leave,
691 .pre_restore = acpi_pm_freeze,
692 .restore_cleanup = acpi_pm_thaw,
693 .recover = acpi_pm_finish,
694};
695#endif /* CONFIG_HIBERNATION */
696
697int acpi_suspend(u32 acpi_state)
698{
699 suspend_state_t states[] = {
700 [1] = PM_SUSPEND_STANDBY,
701 [3] = PM_SUSPEND_MEM,
702 [5] = PM_SUSPEND_MAX
703 };
704
705 if (acpi_state < 6 && states[acpi_state])
706 return pm_suspend(states[acpi_state]);
707 if (acpi_state == 4)
708 return hibernate();
709 return -EINVAL;
710}
711
712#ifdef CONFIG_PM
713/**
714 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
715 * in the system sleep state given by %acpi_target_sleep_state
716 * @dev: device to examine; its driver model wakeup flags control
717 * whether it should be able to wake up the system
718 * @d_min_p: used to store the upper limit of allowed states range
719 * Return value: preferred power state of the device on success, -ENODEV on
720 * failure (ie. if there's no 'struct acpi_device' for @dev)
721 *
722 * Find the lowest power (highest number) ACPI device power state that
723 * device @dev can be in while the system is in the sleep state represented
724 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
725 * able to wake up the system from this sleep state. If @d_min_p is set,
726 * the highest power (lowest number) device power state of @dev allowed
727 * in this system sleep state is stored at the location pointed to by it.
728 *
729 * The caller must ensure that @dev is valid before using this function.
730 * The caller is also responsible for figuring out if the device is
731 * supposed to be able to wake up the system and passing this information
732 * via @wake.
733 */
734
735int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
736{
737 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
738 struct acpi_device *adev;
739 char acpi_method[] = "_SxD";
740 unsigned long long d_min, d_max;
741
742 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
743 printk(KERN_DEBUG "ACPI handle has no context!\n");
744 return -ENODEV;
745 }
746
747 acpi_method[2] = '0' + acpi_target_sleep_state;
748 /*
749 * If the sleep state is S0, we will return D3, but if the device has
750 * _S0W, we will use the value from _S0W
751 */
752 d_min = ACPI_STATE_D0;
753 d_max = ACPI_STATE_D3;
754
755 /*
756 * If present, _SxD methods return the minimum D-state (highest power
757 * state) we can use for the corresponding S-states. Otherwise, the
758 * minimum D-state is D0 (ACPI 3.x).
759 *
760 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
761 * provided -- that's our fault recovery, we ignore retval.
762 */
763 if (acpi_target_sleep_state > ACPI_STATE_S0)
764 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
765
766 /*
767 * If _PRW says we can wake up the system from the target sleep state,
768 * the D-state returned by _SxD is sufficient for that (we assume a
769 * wakeup-aware driver if wake is set). Still, if _SxW exists
770 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
771 * can wake the system. _S0W may be valid, too.
772 */
773 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
774 (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
775 adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
776 acpi_status status;
777
778 acpi_method[3] = 'W';
779 status = acpi_evaluate_integer(handle, acpi_method, NULL,
780 &d_max);
781 if (ACPI_FAILURE(status)) {
782 if (acpi_target_sleep_state != ACPI_STATE_S0 ||
783 status != AE_NOT_FOUND)
784 d_max = d_min;
785 } else if (d_max < d_min) {
786 /* Warn the user of the broken DSDT */
787 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
788 acpi_method);
789 /* Sanitize it */
790 d_min = d_max;
791 }
792 }
793
794 if (d_min_p)
795 *d_min_p = d_min;
796 return d_max;
797}
798#endif /* CONFIG_PM */
799
800#ifdef CONFIG_PM_SLEEP
801/**
802 * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
803 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
804 * @enable: Whether enable or disable the wake-up functionality.
805 *
806 * Find the ACPI device object corresponding to @pci_dev and try to
807 * enable/disable the GPE associated with it.
808 */
809int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
810{
811 struct acpi_device *dev;
812 acpi_handle handle;
813
814 if (!device_run_wake(phys_dev))
815 return -EINVAL;
816
817 handle = DEVICE_ACPI_HANDLE(phys_dev);
818 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
819 dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
820 __func__);
821 return -ENODEV;
822 }
823
824 if (enable) {
825 acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
826 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
827 } else {
828 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
829 acpi_disable_wakeup_device_power(dev);
830 }
831
832 return 0;
833}
834
835/**
836 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
837 * capability of given device
838 * @dev: device to handle
839 * @enable: 'true' - enable, 'false' - disable the wake-up capability
840 */
841int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
842{
843 acpi_handle handle;
844 struct acpi_device *adev;
845 int error;
846
847 if (!device_can_wakeup(dev))
848 return -EINVAL;
849
850 handle = DEVICE_ACPI_HANDLE(dev);
851 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
852 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
853 return -ENODEV;
854 }
855
856 error = enable ?
857 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
858 acpi_disable_wakeup_device_power(adev);
859 if (!error)
860 dev_info(dev, "wake-up capability %s by ACPI\n",
861 enable ? "enabled" : "disabled");
862
863 return error;
864}
865#endif /* CONFIG_PM_SLEEP */
866
867static void acpi_power_off_prepare(void)
868{
869 /* Prepare to power off the system */
870 acpi_sleep_prepare(ACPI_STATE_S5);
871 acpi_disable_all_gpes();
872}
873
874static void acpi_power_off(void)
875{
876 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
877 printk(KERN_DEBUG "%s called\n", __func__);
878 local_irq_disable();
879 acpi_enter_sleep_state(ACPI_STATE_S5, wake_sleep_flags);
880}
881
882/*
883 * ACPI 2.0 created the optional _GTS and _BFS,
884 * but industry adoption has been neither rapid nor broad.
885 *
886 * Linux gets into trouble when it executes poorly validated
887 * paths through the BIOS, so disable _GTS and _BFS by default,
888 * but do speak up and offer the option to enable them.
889 */
890static void __init acpi_gts_bfs_check(void)
891{
892 acpi_handle dummy;
893
894 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__GTS, &dummy)))
895 {
896 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
897 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
898 "please notify linux-acpi@vger.kernel.org\n");
899 }
900 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__BFS, &dummy)))
901 {
902 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
903 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
904 "please notify linux-acpi@vger.kernel.org\n");
905 }
906}
907
908int __init acpi_sleep_init(void)
909{
910 acpi_status status;
911 u8 type_a, type_b;
912#ifdef CONFIG_SUSPEND
913 int i = 0;
914
915 dmi_check_system(acpisleep_dmi_table);
916#endif
917
918 if (acpi_disabled)
919 return 0;
920
921 sleep_states[ACPI_STATE_S0] = 1;
922 printk(KERN_INFO PREFIX "(supports S0");
923
924#ifdef CONFIG_SUSPEND
925 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
926 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
927 if (ACPI_SUCCESS(status)) {
928 sleep_states[i] = 1;
929 printk(KERN_CONT " S%d", i);
930 }
931 }
932
933 suspend_set_ops(old_suspend_ordering ?
934 &acpi_suspend_ops_old : &acpi_suspend_ops);
935#endif
936
937#ifdef CONFIG_HIBERNATION
938 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
939 if (ACPI_SUCCESS(status)) {
940 hibernation_set_ops(old_suspend_ordering ?
941 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
942 sleep_states[ACPI_STATE_S4] = 1;
943 printk(KERN_CONT " S4");
944 if (!nosigcheck) {
945 acpi_get_table(ACPI_SIG_FACS, 1,
946 (struct acpi_table_header **)&facs);
947 if (facs)
948 s4_hardware_signature =
949 facs->hardware_signature;
950 }
951 }
952#endif
953 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
954 if (ACPI_SUCCESS(status)) {
955 sleep_states[ACPI_STATE_S5] = 1;
956 printk(KERN_CONT " S5");
957 pm_power_off_prepare = acpi_power_off_prepare;
958 pm_power_off = acpi_power_off;
959 }
960 printk(KERN_CONT ")\n");
961 /*
962 * Register the tts_notifier to reboot notifier list so that the _TTS
963 * object can also be evaluated when the system enters S5.
964 */
965 register_reboot_notifier(&tts_notifier);
966 acpi_gts_bfs_check();
967 return 0;
968}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * sleep.c - ACPI sleep support.
4 *
5 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
6 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
7 * Copyright (c) 2000-2003 Patrick Mochel
8 * Copyright (c) 2003 Open Source Development Lab
9 */
10
11#define pr_fmt(fmt) "ACPI: PM: " fmt
12
13#include <linux/delay.h>
14#include <linux/irq.h>
15#include <linux/dmi.h>
16#include <linux/device.h>
17#include <linux/interrupt.h>
18#include <linux/suspend.h>
19#include <linux/reboot.h>
20#include <linux/acpi.h>
21#include <linux/module.h>
22#include <linux/syscore_ops.h>
23#include <asm/io.h>
24#include <trace/events/power.h>
25
26#include "internal.h"
27#include "sleep.h"
28
29/*
30 * Some HW-full platforms do not have _S5, so they may need
31 * to leverage efi power off for a shutdown.
32 */
33bool acpi_no_s5;
34static u8 sleep_states[ACPI_S_STATE_COUNT];
35
36static void acpi_sleep_tts_switch(u32 acpi_state)
37{
38 acpi_status status;
39
40 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
41 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
42 /*
43 * OS can't evaluate the _TTS object correctly. Some warning
44 * message will be printed. But it won't break anything.
45 */
46 pr_notice("Failure in evaluating _TTS object\n");
47 }
48}
49
50static int tts_notify_reboot(struct notifier_block *this,
51 unsigned long code, void *x)
52{
53 acpi_sleep_tts_switch(ACPI_STATE_S5);
54 return NOTIFY_DONE;
55}
56
57static struct notifier_block tts_notifier = {
58 .notifier_call = tts_notify_reboot,
59 .next = NULL,
60 .priority = 0,
61};
62
63#ifndef acpi_skip_set_wakeup_address
64#define acpi_skip_set_wakeup_address() false
65#endif
66
67static int acpi_sleep_prepare(u32 acpi_state)
68{
69#ifdef CONFIG_ACPI_SLEEP
70 unsigned long acpi_wakeup_address;
71
72 /* do we have a wakeup address for S2 and S3? */
73 if (acpi_state == ACPI_STATE_S3 && !acpi_skip_set_wakeup_address()) {
74 acpi_wakeup_address = acpi_get_wakeup_address();
75 if (!acpi_wakeup_address)
76 return -EFAULT;
77 acpi_set_waking_vector(acpi_wakeup_address);
78
79 }
80#endif
81 pr_info("Preparing to enter system sleep state S%d\n", acpi_state);
82 acpi_enable_wakeup_devices(acpi_state);
83 acpi_enter_sleep_state_prep(acpi_state);
84 return 0;
85}
86
87bool acpi_sleep_state_supported(u8 sleep_state)
88{
89 acpi_status status;
90 u8 type_a, type_b;
91
92 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
93 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
94 || (acpi_gbl_FADT.sleep_control.address
95 && acpi_gbl_FADT.sleep_status.address));
96}
97
98#ifdef CONFIG_ACPI_SLEEP
99static u32 acpi_target_sleep_state = ACPI_STATE_S0;
100
101u32 acpi_target_system_state(void)
102{
103 return acpi_target_sleep_state;
104}
105EXPORT_SYMBOL_GPL(acpi_target_system_state);
106
107static bool pwr_btn_event_pending;
108
109/*
110 * The ACPI specification wants us to save NVS memory regions during hibernation
111 * and to restore them during the subsequent resume. Windows does that also for
112 * suspend to RAM. However, it is known that this mechanism does not work on
113 * all machines, so we allow the user to disable it with the help of the
114 * 'acpi_sleep=nonvs' kernel command line option.
115 */
116static bool nvs_nosave;
117
118void __init acpi_nvs_nosave(void)
119{
120 nvs_nosave = true;
121}
122
123/*
124 * The ACPI specification wants us to save NVS memory regions during hibernation
125 * but says nothing about saving NVS during S3. Not all versions of Windows
126 * save NVS on S3 suspend either, and it is clear that not all systems need
127 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
128 * user to disable saving NVS on S3 if their system does not require it, but
129 * continue to save/restore NVS for S4 as specified.
130 */
131static bool nvs_nosave_s3;
132
133void __init acpi_nvs_nosave_s3(void)
134{
135 nvs_nosave_s3 = true;
136}
137
138static int __init init_nvs_save_s3(const struct dmi_system_id *d)
139{
140 nvs_nosave_s3 = false;
141 return 0;
142}
143
144/*
145 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
146 * user to request that behavior by using the 'acpi_old_suspend_ordering'
147 * kernel command line option that causes the following variable to be set.
148 */
149static bool old_suspend_ordering;
150
151void __init acpi_old_suspend_ordering(void)
152{
153 old_suspend_ordering = true;
154}
155
156static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
157{
158 acpi_old_suspend_ordering();
159 return 0;
160}
161
162static int __init init_nvs_nosave(const struct dmi_system_id *d)
163{
164 acpi_nvs_nosave();
165 return 0;
166}
167
168bool acpi_sleep_default_s3;
169
170static int __init init_default_s3(const struct dmi_system_id *d)
171{
172 acpi_sleep_default_s3 = true;
173 return 0;
174}
175
176static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
177 {
178 .callback = init_old_suspend_ordering,
179 .ident = "Abit KN9 (nForce4 variant)",
180 .matches = {
181 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
182 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
183 },
184 },
185 {
186 .callback = init_old_suspend_ordering,
187 .ident = "HP xw4600 Workstation",
188 .matches = {
189 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
190 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
191 },
192 },
193 {
194 .callback = init_old_suspend_ordering,
195 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
196 .matches = {
197 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
198 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
199 },
200 },
201 {
202 .callback = init_old_suspend_ordering,
203 .ident = "Panasonic CF51-2L",
204 .matches = {
205 DMI_MATCH(DMI_BOARD_VENDOR,
206 "Matsushita Electric Industrial Co.,Ltd."),
207 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
208 },
209 },
210 {
211 .callback = init_nvs_nosave,
212 .ident = "Sony Vaio VGN-FW41E_H",
213 .matches = {
214 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
215 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
216 },
217 },
218 {
219 .callback = init_nvs_nosave,
220 .ident = "Sony Vaio VGN-FW21E",
221 .matches = {
222 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
223 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
224 },
225 },
226 {
227 .callback = init_nvs_nosave,
228 .ident = "Sony Vaio VGN-FW21M",
229 .matches = {
230 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
231 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
232 },
233 },
234 {
235 .callback = init_nvs_nosave,
236 .ident = "Sony Vaio VPCEB17FX",
237 .matches = {
238 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
239 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
240 },
241 },
242 {
243 .callback = init_nvs_nosave,
244 .ident = "Sony Vaio VGN-SR11M",
245 .matches = {
246 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
247 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
248 },
249 },
250 {
251 .callback = init_nvs_nosave,
252 .ident = "Everex StepNote Series",
253 .matches = {
254 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
255 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
256 },
257 },
258 {
259 .callback = init_nvs_nosave,
260 .ident = "Sony Vaio VPCEB1Z1E",
261 .matches = {
262 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
263 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
264 },
265 },
266 {
267 .callback = init_nvs_nosave,
268 .ident = "Sony Vaio VGN-NW130D",
269 .matches = {
270 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
271 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
272 },
273 },
274 {
275 .callback = init_nvs_nosave,
276 .ident = "Sony Vaio VPCCW29FX",
277 .matches = {
278 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
279 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
280 },
281 },
282 {
283 .callback = init_nvs_nosave,
284 .ident = "Averatec AV1020-ED2",
285 .matches = {
286 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
287 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
288 },
289 },
290 {
291 .callback = init_old_suspend_ordering,
292 .ident = "Asus A8N-SLI DELUXE",
293 .matches = {
294 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
295 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
296 },
297 },
298 {
299 .callback = init_old_suspend_ordering,
300 .ident = "Asus A8N-SLI Premium",
301 .matches = {
302 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
303 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
304 },
305 },
306 {
307 .callback = init_nvs_nosave,
308 .ident = "Sony Vaio VGN-SR26GN_P",
309 .matches = {
310 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
311 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
312 },
313 },
314 {
315 .callback = init_nvs_nosave,
316 .ident = "Sony Vaio VPCEB1S1E",
317 .matches = {
318 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
319 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
320 },
321 },
322 {
323 .callback = init_nvs_nosave,
324 .ident = "Sony Vaio VGN-FW520F",
325 .matches = {
326 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
327 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
328 },
329 },
330 {
331 .callback = init_nvs_nosave,
332 .ident = "Asus K54C",
333 .matches = {
334 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
335 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
336 },
337 },
338 {
339 .callback = init_nvs_nosave,
340 .ident = "Asus K54HR",
341 .matches = {
342 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
343 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
344 },
345 },
346 {
347 .callback = init_nvs_save_s3,
348 .ident = "Asus 1025C",
349 .matches = {
350 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
351 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
352 },
353 },
354 /*
355 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
356 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
357 * saving during S3.
358 */
359 {
360 .callback = init_nvs_save_s3,
361 .ident = "Lenovo G50-45",
362 .matches = {
363 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
364 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
365 },
366 },
367 {
368 .callback = init_nvs_save_s3,
369 .ident = "Lenovo G40-45",
370 .matches = {
371 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
372 DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
373 },
374 },
375 /*
376 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
377 * the Low Power S0 Idle firmware interface (see
378 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
379 */
380 {
381 .callback = init_default_s3,
382 .ident = "ThinkPad X1 Tablet(2016)",
383 .matches = {
384 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
385 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
386 },
387 },
388 {},
389};
390
391static bool ignore_blacklist;
392
393void __init acpi_sleep_no_blacklist(void)
394{
395 ignore_blacklist = true;
396}
397
398static void __init acpi_sleep_dmi_check(void)
399{
400 if (ignore_blacklist)
401 return;
402
403 if (dmi_get_bios_year() >= 2012)
404 acpi_nvs_nosave_s3();
405
406 dmi_check_system(acpisleep_dmi_table);
407}
408
409/**
410 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
411 */
412static int acpi_pm_freeze(void)
413{
414 acpi_disable_all_gpes();
415 acpi_os_wait_events_complete();
416 acpi_ec_block_transactions();
417 return 0;
418}
419
420/**
421 * acpi_pm_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
422 */
423static int acpi_pm_pre_suspend(void)
424{
425 acpi_pm_freeze();
426 return suspend_nvs_save();
427}
428
429/**
430 * __acpi_pm_prepare - Prepare the platform to enter the target state.
431 *
432 * If necessary, set the firmware waking vector and do arch-specific
433 * nastiness to get the wakeup code to the waking vector.
434 */
435static int __acpi_pm_prepare(void)
436{
437 int error = acpi_sleep_prepare(acpi_target_sleep_state);
438 if (error)
439 acpi_target_sleep_state = ACPI_STATE_S0;
440
441 return error;
442}
443
444/**
445 * acpi_pm_prepare - Prepare the platform to enter the target sleep
446 * state and disable the GPEs.
447 */
448static int acpi_pm_prepare(void)
449{
450 int error = __acpi_pm_prepare();
451 if (!error)
452 error = acpi_pm_pre_suspend();
453
454 return error;
455}
456
457/**
458 * acpi_pm_finish - Instruct the platform to leave a sleep state.
459 *
460 * This is called after we wake back up (or if entering the sleep state
461 * failed).
462 */
463static void acpi_pm_finish(void)
464{
465 struct acpi_device *pwr_btn_adev;
466 u32 acpi_state = acpi_target_sleep_state;
467
468 acpi_ec_unblock_transactions();
469 suspend_nvs_free();
470
471 if (acpi_state == ACPI_STATE_S0)
472 return;
473
474 pr_info("Waking up from system sleep state S%d\n", acpi_state);
475 acpi_disable_wakeup_devices(acpi_state);
476 acpi_leave_sleep_state(acpi_state);
477
478 /* reset firmware waking vector */
479 acpi_set_waking_vector(0);
480
481 acpi_target_sleep_state = ACPI_STATE_S0;
482
483 acpi_resume_power_resources();
484
485 /* If we were woken with the fixed power button, provide a small
486 * hint to userspace in the form of a wakeup event on the fixed power
487 * button device (if it can be found).
488 *
489 * We delay the event generation til now, as the PM layer requires
490 * timekeeping to be running before we generate events. */
491 if (!pwr_btn_event_pending)
492 return;
493
494 pwr_btn_event_pending = false;
495 pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
496 NULL, -1);
497 if (pwr_btn_adev) {
498 pm_wakeup_event(&pwr_btn_adev->dev, 0);
499 acpi_dev_put(pwr_btn_adev);
500 }
501}
502
503/**
504 * acpi_pm_start - Start system PM transition.
505 * @acpi_state: The target ACPI power state to transition to.
506 */
507static void acpi_pm_start(u32 acpi_state)
508{
509 acpi_target_sleep_state = acpi_state;
510 acpi_sleep_tts_switch(acpi_target_sleep_state);
511 acpi_scan_lock_acquire();
512}
513
514/**
515 * acpi_pm_end - Finish up system PM transition.
516 */
517static void acpi_pm_end(void)
518{
519 acpi_turn_off_unused_power_resources();
520 acpi_scan_lock_release();
521 /*
522 * This is necessary in case acpi_pm_finish() is not called during a
523 * failing transition to a sleep state.
524 */
525 acpi_target_sleep_state = ACPI_STATE_S0;
526 acpi_sleep_tts_switch(acpi_target_sleep_state);
527}
528#else /* !CONFIG_ACPI_SLEEP */
529#define sleep_no_lps0 (1)
530#define acpi_target_sleep_state ACPI_STATE_S0
531#define acpi_sleep_default_s3 (1)
532static inline void acpi_sleep_dmi_check(void) {}
533#endif /* CONFIG_ACPI_SLEEP */
534
535#ifdef CONFIG_SUSPEND
536static u32 acpi_suspend_states[] = {
537 [PM_SUSPEND_ON] = ACPI_STATE_S0,
538 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
539 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
540 [PM_SUSPEND_MAX] = ACPI_STATE_S5
541};
542
543/**
544 * acpi_suspend_begin - Set the target system sleep state to the state
545 * associated with given @pm_state, if supported.
546 * @pm_state: The target system power management state.
547 */
548static int acpi_suspend_begin(suspend_state_t pm_state)
549{
550 u32 acpi_state = acpi_suspend_states[pm_state];
551 int error;
552
553 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
554 if (error)
555 return error;
556
557 if (!sleep_states[acpi_state]) {
558 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
559 return -ENOSYS;
560 }
561 if (acpi_state > ACPI_STATE_S1)
562 pm_set_suspend_via_firmware();
563
564 acpi_pm_start(acpi_state);
565 return 0;
566}
567
568/**
569 * acpi_suspend_enter - Actually enter a sleep state.
570 * @pm_state: ignored
571 *
572 * Flush caches and go to sleep. For STR we have to call arch-specific
573 * assembly, which in turn call acpi_enter_sleep_state().
574 * It's unfortunate, but it works. Please fix if you're feeling frisky.
575 */
576static int acpi_suspend_enter(suspend_state_t pm_state)
577{
578 acpi_status status = AE_OK;
579 u32 acpi_state = acpi_target_sleep_state;
580 int error;
581
582 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
583 switch (acpi_state) {
584 case ACPI_STATE_S1:
585 barrier();
586 status = acpi_enter_sleep_state(acpi_state);
587 break;
588
589 case ACPI_STATE_S3:
590 if (!acpi_suspend_lowlevel)
591 return -ENOSYS;
592 error = acpi_suspend_lowlevel();
593 if (error)
594 return error;
595 pr_info("Low-level resume complete\n");
596 pm_set_resume_via_firmware();
597 break;
598 }
599 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
600
601 /* This violates the spec but is required for bug compatibility. */
602 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
603
604 /* Reprogram control registers */
605 acpi_leave_sleep_state_prep(acpi_state);
606
607 /* ACPI 3.0 specs (P62) says that it's the responsibility
608 * of the OSPM to clear the status bit [ implying that the
609 * POWER_BUTTON event should not reach userspace ]
610 *
611 * However, we do generate a small hint for userspace in the form of
612 * a wakeup event. We flag this condition for now and generate the
613 * event later, as we're currently too early in resume to be able to
614 * generate wakeup events.
615 */
616 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
617 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
618
619 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
620
621 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
622 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
623 /* Flag for later */
624 pwr_btn_event_pending = true;
625 }
626 }
627
628 /*
629 * Disable all GPE and clear their status bits before interrupts are
630 * enabled. Some GPEs (like wakeup GPEs) have no handlers and this can
631 * prevent them from producing spurious interrups.
632 *
633 * acpi_leave_sleep_state() will reenable specific GPEs later.
634 *
635 * Because this code runs on one CPU with disabled interrupts (all of
636 * the other CPUs are offline at this time), it need not acquire any
637 * sleeping locks which may trigger an implicit preemption point even
638 * if there is no contention, so avoid doing that by using a low-level
639 * library routine here.
640 */
641 acpi_hw_disable_all_gpes();
642 /* Allow EC transactions to happen. */
643 acpi_ec_unblock_transactions();
644
645 suspend_nvs_restore();
646
647 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
648}
649
650static int acpi_suspend_state_valid(suspend_state_t pm_state)
651{
652 u32 acpi_state;
653
654 switch (pm_state) {
655 case PM_SUSPEND_ON:
656 case PM_SUSPEND_STANDBY:
657 case PM_SUSPEND_MEM:
658 acpi_state = acpi_suspend_states[pm_state];
659
660 return sleep_states[acpi_state];
661 default:
662 return 0;
663 }
664}
665
666static const struct platform_suspend_ops acpi_suspend_ops = {
667 .valid = acpi_suspend_state_valid,
668 .begin = acpi_suspend_begin,
669 .prepare_late = acpi_pm_prepare,
670 .enter = acpi_suspend_enter,
671 .wake = acpi_pm_finish,
672 .end = acpi_pm_end,
673};
674
675/**
676 * acpi_suspend_begin_old - Set the target system sleep state to the
677 * state associated with given @pm_state, if supported, and
678 * execute the _PTS control method. This function is used if the
679 * pre-ACPI 2.0 suspend ordering has been requested.
680 * @pm_state: The target suspend state for the system.
681 */
682static int acpi_suspend_begin_old(suspend_state_t pm_state)
683{
684 int error = acpi_suspend_begin(pm_state);
685 if (!error)
686 error = __acpi_pm_prepare();
687
688 return error;
689}
690
691/*
692 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
693 * been requested.
694 */
695static const struct platform_suspend_ops acpi_suspend_ops_old = {
696 .valid = acpi_suspend_state_valid,
697 .begin = acpi_suspend_begin_old,
698 .prepare_late = acpi_pm_pre_suspend,
699 .enter = acpi_suspend_enter,
700 .wake = acpi_pm_finish,
701 .end = acpi_pm_end,
702 .recover = acpi_pm_finish,
703};
704
705static bool s2idle_wakeup;
706
707int acpi_s2idle_begin(void)
708{
709 acpi_scan_lock_acquire();
710 return 0;
711}
712
713int acpi_s2idle_prepare(void)
714{
715 if (acpi_sci_irq_valid()) {
716 int error;
717
718 error = enable_irq_wake(acpi_sci_irq);
719 if (error)
720 pr_warn("Warning: Failed to enable wakeup from IRQ %d: %d\n",
721 acpi_sci_irq, error);
722
723 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
724 }
725
726 acpi_enable_wakeup_devices(ACPI_STATE_S0);
727
728 /* Change the configuration of GPEs to avoid spurious wakeup. */
729 acpi_enable_all_wakeup_gpes();
730 acpi_os_wait_events_complete();
731
732 s2idle_wakeup = true;
733 return 0;
734}
735
736bool acpi_s2idle_wake(void)
737{
738 if (!acpi_sci_irq_valid())
739 return pm_wakeup_pending();
740
741 while (pm_wakeup_pending()) {
742 /*
743 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
744 * SCI has not triggered while suspended, so bail out (the
745 * wakeup is pending anyway and the SCI is not the source of
746 * it).
747 */
748 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
749 pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
750 return true;
751 }
752
753 /*
754 * If the status bit of any enabled fixed event is set, the
755 * wakeup is regarded as valid.
756 */
757 if (acpi_any_fixed_event_status_set()) {
758 pm_pr_dbg("ACPI fixed event wakeup\n");
759 return true;
760 }
761
762 /* Check wakeups from drivers sharing the SCI. */
763 if (acpi_check_wakeup_handlers()) {
764 pm_pr_dbg("ACPI custom handler wakeup\n");
765 return true;
766 }
767
768 /*
769 * Check non-EC GPE wakeups and if there are none, cancel the
770 * SCI-related wakeup and dispatch the EC GPE.
771 */
772 if (acpi_ec_dispatch_gpe()) {
773 pm_pr_dbg("ACPI non-EC GPE wakeup\n");
774 return true;
775 }
776
777 acpi_os_wait_events_complete();
778
779 /*
780 * The SCI is in the "suspended" state now and it cannot produce
781 * new wakeup events till the rearming below, so if any of them
782 * are pending here, they must be resulting from the processing
783 * of EC events above or coming from somewhere else.
784 */
785 if (pm_wakeup_pending()) {
786 pm_pr_dbg("Wakeup after ACPI Notify sync\n");
787 return true;
788 }
789
790 pm_pr_dbg("Rearming ACPI SCI for wakeup\n");
791
792 pm_wakeup_clear(acpi_sci_irq);
793 rearm_wake_irq(acpi_sci_irq);
794 }
795
796 return false;
797}
798
799void acpi_s2idle_restore(void)
800{
801 /*
802 * Drain pending events before restoring the working-state configuration
803 * of GPEs.
804 */
805 acpi_os_wait_events_complete(); /* synchronize GPE processing */
806 acpi_ec_flush_work(); /* flush the EC driver's workqueues */
807 acpi_os_wait_events_complete(); /* synchronize Notify handling */
808
809 s2idle_wakeup = false;
810
811 acpi_enable_all_runtime_gpes();
812
813 acpi_disable_wakeup_devices(ACPI_STATE_S0);
814
815 if (acpi_sci_irq_valid()) {
816 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
817 disable_irq_wake(acpi_sci_irq);
818 }
819}
820
821void acpi_s2idle_end(void)
822{
823 acpi_scan_lock_release();
824}
825
826static const struct platform_s2idle_ops acpi_s2idle_ops = {
827 .begin = acpi_s2idle_begin,
828 .prepare = acpi_s2idle_prepare,
829 .wake = acpi_s2idle_wake,
830 .restore = acpi_s2idle_restore,
831 .end = acpi_s2idle_end,
832};
833
834void __weak acpi_s2idle_setup(void)
835{
836 if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
837 pr_info("Efficient low-power S0 idle declared\n");
838
839 s2idle_set_ops(&acpi_s2idle_ops);
840}
841
842static void __init acpi_sleep_suspend_setup(void)
843{
844 bool suspend_ops_needed = false;
845 int i;
846
847 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
848 if (acpi_sleep_state_supported(i)) {
849 sleep_states[i] = 1;
850 suspend_ops_needed = true;
851 }
852
853 if (suspend_ops_needed)
854 suspend_set_ops(old_suspend_ordering ?
855 &acpi_suspend_ops_old : &acpi_suspend_ops);
856
857 acpi_s2idle_setup();
858}
859
860#else /* !CONFIG_SUSPEND */
861#define s2idle_wakeup (false)
862static inline void acpi_sleep_suspend_setup(void) {}
863#endif /* !CONFIG_SUSPEND */
864
865bool acpi_s2idle_wakeup(void)
866{
867 return s2idle_wakeup;
868}
869
870#ifdef CONFIG_PM_SLEEP
871static u32 saved_bm_rld;
872
873static int acpi_save_bm_rld(void)
874{
875 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
876 return 0;
877}
878
879static void acpi_restore_bm_rld(void)
880{
881 u32 resumed_bm_rld = 0;
882
883 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
884 if (resumed_bm_rld == saved_bm_rld)
885 return;
886
887 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
888}
889
890static struct syscore_ops acpi_sleep_syscore_ops = {
891 .suspend = acpi_save_bm_rld,
892 .resume = acpi_restore_bm_rld,
893};
894
895static void acpi_sleep_syscore_init(void)
896{
897 register_syscore_ops(&acpi_sleep_syscore_ops);
898}
899#else
900static inline void acpi_sleep_syscore_init(void) {}
901#endif /* CONFIG_PM_SLEEP */
902
903#ifdef CONFIG_HIBERNATION
904static unsigned long s4_hardware_signature;
905static struct acpi_table_facs *facs;
906int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */
907
908static int acpi_hibernation_begin(pm_message_t stage)
909{
910 if (!nvs_nosave) {
911 int error = suspend_nvs_alloc();
912 if (error)
913 return error;
914 }
915
916 if (stage.event == PM_EVENT_HIBERNATE)
917 pm_set_suspend_via_firmware();
918
919 acpi_pm_start(ACPI_STATE_S4);
920 return 0;
921}
922
923static int acpi_hibernation_enter(void)
924{
925 acpi_status status = AE_OK;
926
927 /* This shouldn't return. If it returns, we have a problem */
928 status = acpi_enter_sleep_state(ACPI_STATE_S4);
929 /* Reprogram control registers */
930 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
931
932 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
933}
934
935static void acpi_hibernation_leave(void)
936{
937 pm_set_resume_via_firmware();
938 /*
939 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
940 * enable it here.
941 */
942 acpi_enable();
943 /* Reprogram control registers */
944 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
945 /* Check the hardware signature */
946 if (facs && s4_hardware_signature != facs->hardware_signature)
947 pr_crit("Hardware changed while hibernated, success doubtful!\n");
948 /* Restore the NVS memory area */
949 suspend_nvs_restore();
950 /* Allow EC transactions to happen. */
951 acpi_ec_unblock_transactions();
952}
953
954static void acpi_pm_thaw(void)
955{
956 acpi_ec_unblock_transactions();
957 acpi_enable_all_runtime_gpes();
958}
959
960static const struct platform_hibernation_ops acpi_hibernation_ops = {
961 .begin = acpi_hibernation_begin,
962 .end = acpi_pm_end,
963 .pre_snapshot = acpi_pm_prepare,
964 .finish = acpi_pm_finish,
965 .prepare = acpi_pm_prepare,
966 .enter = acpi_hibernation_enter,
967 .leave = acpi_hibernation_leave,
968 .pre_restore = acpi_pm_freeze,
969 .restore_cleanup = acpi_pm_thaw,
970};
971
972/**
973 * acpi_hibernation_begin_old - Set the target system sleep state to
974 * ACPI_STATE_S4 and execute the _PTS control method. This
975 * function is used if the pre-ACPI 2.0 suspend ordering has been
976 * requested.
977 * @stage: The power management event message.
978 */
979static int acpi_hibernation_begin_old(pm_message_t stage)
980{
981 int error;
982 /*
983 * The _TTS object should always be evaluated before the _PTS object.
984 * When the old_suspended_ordering is true, the _PTS object is
985 * evaluated in the acpi_sleep_prepare.
986 */
987 acpi_sleep_tts_switch(ACPI_STATE_S4);
988
989 error = acpi_sleep_prepare(ACPI_STATE_S4);
990 if (error)
991 return error;
992
993 if (!nvs_nosave) {
994 error = suspend_nvs_alloc();
995 if (error)
996 return error;
997 }
998
999 if (stage.event == PM_EVENT_HIBERNATE)
1000 pm_set_suspend_via_firmware();
1001
1002 acpi_target_sleep_state = ACPI_STATE_S4;
1003 acpi_scan_lock_acquire();
1004 return 0;
1005}
1006
1007/*
1008 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1009 * been requested.
1010 */
1011static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1012 .begin = acpi_hibernation_begin_old,
1013 .end = acpi_pm_end,
1014 .pre_snapshot = acpi_pm_pre_suspend,
1015 .prepare = acpi_pm_freeze,
1016 .finish = acpi_pm_finish,
1017 .enter = acpi_hibernation_enter,
1018 .leave = acpi_hibernation_leave,
1019 .pre_restore = acpi_pm_freeze,
1020 .restore_cleanup = acpi_pm_thaw,
1021 .recover = acpi_pm_finish,
1022};
1023
1024static void acpi_sleep_hibernate_setup(void)
1025{
1026 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1027 return;
1028
1029 hibernation_set_ops(old_suspend_ordering ?
1030 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1031 sleep_states[ACPI_STATE_S4] = 1;
1032 if (!acpi_check_s4_hw_signature)
1033 return;
1034
1035 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1036 if (facs) {
1037 /*
1038 * s4_hardware_signature is the local variable which is just
1039 * used to warn about mismatch after we're attempting to
1040 * resume (in violation of the ACPI specification.)
1041 */
1042 s4_hardware_signature = facs->hardware_signature;
1043
1044 if (acpi_check_s4_hw_signature > 0) {
1045 /*
1046 * If we're actually obeying the ACPI specification
1047 * then the signature is written out as part of the
1048 * swsusp header, in order to allow the boot kernel
1049 * to gracefully decline to resume.
1050 */
1051 swsusp_hardware_signature = facs->hardware_signature;
1052 }
1053 }
1054}
1055#else /* !CONFIG_HIBERNATION */
1056static inline void acpi_sleep_hibernate_setup(void) {}
1057#endif /* !CONFIG_HIBERNATION */
1058
1059static int acpi_power_off_prepare(struct sys_off_data *data)
1060{
1061 /* Prepare to power off the system */
1062 acpi_sleep_prepare(ACPI_STATE_S5);
1063 acpi_disable_all_gpes();
1064 acpi_os_wait_events_complete();
1065 return NOTIFY_DONE;
1066}
1067
1068static int acpi_power_off(struct sys_off_data *data)
1069{
1070 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1071 pr_debug("%s called\n", __func__);
1072 local_irq_disable();
1073 acpi_enter_sleep_state(ACPI_STATE_S5);
1074 return NOTIFY_DONE;
1075}
1076
1077int __init acpi_sleep_init(void)
1078{
1079 char supported[ACPI_S_STATE_COUNT * 3 + 1];
1080 char *pos = supported;
1081 int i;
1082
1083 acpi_sleep_dmi_check();
1084
1085 sleep_states[ACPI_STATE_S0] = 1;
1086
1087 acpi_sleep_syscore_init();
1088 acpi_sleep_suspend_setup();
1089 acpi_sleep_hibernate_setup();
1090
1091 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1092 sleep_states[ACPI_STATE_S5] = 1;
1093
1094 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
1095 SYS_OFF_PRIO_FIRMWARE,
1096 acpi_power_off_prepare, NULL);
1097
1098 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
1099 SYS_OFF_PRIO_FIRMWARE,
1100 acpi_power_off, NULL);
1101
1102 /*
1103 * Windows uses S5 for reboot, so some BIOSes depend on it to
1104 * perform proper reboot.
1105 */
1106 register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
1107 SYS_OFF_PRIO_FIRMWARE,
1108 acpi_power_off_prepare, NULL);
1109 } else {
1110 acpi_no_s5 = true;
1111 }
1112
1113 supported[0] = 0;
1114 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1115 if (sleep_states[i])
1116 pos += sprintf(pos, " S%d", i);
1117 }
1118 pr_info("(supports%s)\n", supported);
1119
1120 /*
1121 * Register the tts_notifier to reboot notifier list so that the _TTS
1122 * object can also be evaluated when the system enters S5.
1123 */
1124 register_reboot_notifier(&tts_notifier);
1125 return 0;
1126}