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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 * ASUS B1400CEAE hangs on resume from suspend (see
390 * https://bugzilla.kernel.org/show_bug.cgi?id=215742).
391 */
392 {
393 .callback = init_default_s3,
394 .ident = "ASUS B1400CEAE",
395 .matches = {
396 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
397 DMI_MATCH(DMI_PRODUCT_NAME, "ASUS EXPERTBOOK B1400CEAE"),
398 },
399 },
400 {},
401};
402
403static bool ignore_blacklist;
404
405void __init acpi_sleep_no_blacklist(void)
406{
407 ignore_blacklist = true;
408}
409
410static void __init acpi_sleep_dmi_check(void)
411{
412 if (ignore_blacklist)
413 return;
414
415 if (dmi_get_bios_year() >= 2012)
416 acpi_nvs_nosave_s3();
417
418 dmi_check_system(acpisleep_dmi_table);
419}
420
421/**
422 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
423 */
424static int acpi_pm_freeze(void)
425{
426 acpi_disable_all_gpes();
427 acpi_os_wait_events_complete();
428 acpi_ec_block_transactions();
429 return 0;
430}
431
432/**
433 * acpi_pm_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
434 */
435static int acpi_pm_pre_suspend(void)
436{
437 acpi_pm_freeze();
438 return suspend_nvs_save();
439}
440
441/**
442 * __acpi_pm_prepare - Prepare the platform to enter the target state.
443 *
444 * If necessary, set the firmware waking vector and do arch-specific
445 * nastiness to get the wakeup code to the waking vector.
446 */
447static int __acpi_pm_prepare(void)
448{
449 int error = acpi_sleep_prepare(acpi_target_sleep_state);
450 if (error)
451 acpi_target_sleep_state = ACPI_STATE_S0;
452
453 return error;
454}
455
456/**
457 * acpi_pm_prepare - Prepare the platform to enter the target sleep
458 * state and disable the GPEs.
459 */
460static int acpi_pm_prepare(void)
461{
462 int error = __acpi_pm_prepare();
463 if (!error)
464 error = acpi_pm_pre_suspend();
465
466 return error;
467}
468
469/**
470 * acpi_pm_finish - Instruct the platform to leave a sleep state.
471 *
472 * This is called after we wake back up (or if entering the sleep state
473 * failed).
474 */
475static void acpi_pm_finish(void)
476{
477 struct acpi_device *pwr_btn_adev;
478 u32 acpi_state = acpi_target_sleep_state;
479
480 acpi_ec_unblock_transactions();
481 suspend_nvs_free();
482
483 if (acpi_state == ACPI_STATE_S0)
484 return;
485
486 pr_info("Waking up from system sleep state S%d\n", acpi_state);
487 acpi_disable_wakeup_devices(acpi_state);
488 acpi_leave_sleep_state(acpi_state);
489
490 /* reset firmware waking vector */
491 acpi_set_waking_vector(0);
492
493 acpi_target_sleep_state = ACPI_STATE_S0;
494
495 acpi_resume_power_resources();
496
497 /* If we were woken with the fixed power button, provide a small
498 * hint to userspace in the form of a wakeup event on the fixed power
499 * button device (if it can be found).
500 *
501 * We delay the event generation til now, as the PM layer requires
502 * timekeeping to be running before we generate events. */
503 if (!pwr_btn_event_pending)
504 return;
505
506 pwr_btn_event_pending = false;
507 pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
508 NULL, -1);
509 if (pwr_btn_adev) {
510 pm_wakeup_event(&pwr_btn_adev->dev, 0);
511 acpi_dev_put(pwr_btn_adev);
512 }
513}
514
515/**
516 * acpi_pm_start - Start system PM transition.
517 */
518static void acpi_pm_start(u32 acpi_state)
519{
520 acpi_target_sleep_state = acpi_state;
521 acpi_sleep_tts_switch(acpi_target_sleep_state);
522 acpi_scan_lock_acquire();
523}
524
525/**
526 * acpi_pm_end - Finish up system PM transition.
527 */
528static void acpi_pm_end(void)
529{
530 acpi_turn_off_unused_power_resources();
531 acpi_scan_lock_release();
532 /*
533 * This is necessary in case acpi_pm_finish() is not called during a
534 * failing transition to a sleep state.
535 */
536 acpi_target_sleep_state = ACPI_STATE_S0;
537 acpi_sleep_tts_switch(acpi_target_sleep_state);
538}
539#else /* !CONFIG_ACPI_SLEEP */
540#define sleep_no_lps0 (1)
541#define acpi_target_sleep_state ACPI_STATE_S0
542#define acpi_sleep_default_s3 (1)
543static inline void acpi_sleep_dmi_check(void) {}
544#endif /* CONFIG_ACPI_SLEEP */
545
546#ifdef CONFIG_SUSPEND
547static u32 acpi_suspend_states[] = {
548 [PM_SUSPEND_ON] = ACPI_STATE_S0,
549 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
550 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
551 [PM_SUSPEND_MAX] = ACPI_STATE_S5
552};
553
554/**
555 * acpi_suspend_begin - Set the target system sleep state to the state
556 * associated with given @pm_state, if supported.
557 */
558static int acpi_suspend_begin(suspend_state_t pm_state)
559{
560 u32 acpi_state = acpi_suspend_states[pm_state];
561 int error;
562
563 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
564 if (error)
565 return error;
566
567 if (!sleep_states[acpi_state]) {
568 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
569 return -ENOSYS;
570 }
571 if (acpi_state > ACPI_STATE_S1)
572 pm_set_suspend_via_firmware();
573
574 acpi_pm_start(acpi_state);
575 return 0;
576}
577
578/**
579 * acpi_suspend_enter - Actually enter a sleep state.
580 * @pm_state: ignored
581 *
582 * Flush caches and go to sleep. For STR we have to call arch-specific
583 * assembly, which in turn call acpi_enter_sleep_state().
584 * It's unfortunate, but it works. Please fix if you're feeling frisky.
585 */
586static int acpi_suspend_enter(suspend_state_t pm_state)
587{
588 acpi_status status = AE_OK;
589 u32 acpi_state = acpi_target_sleep_state;
590 int error;
591
592 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
593 switch (acpi_state) {
594 case ACPI_STATE_S1:
595 barrier();
596 status = acpi_enter_sleep_state(acpi_state);
597 break;
598
599 case ACPI_STATE_S3:
600 if (!acpi_suspend_lowlevel)
601 return -ENOSYS;
602 error = acpi_suspend_lowlevel();
603 if (error)
604 return error;
605 pr_info("Low-level resume complete\n");
606 pm_set_resume_via_firmware();
607 break;
608 }
609 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
610
611 /* This violates the spec but is required for bug compatibility. */
612 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
613
614 /* Reprogram control registers */
615 acpi_leave_sleep_state_prep(acpi_state);
616
617 /* ACPI 3.0 specs (P62) says that it's the responsibility
618 * of the OSPM to clear the status bit [ implying that the
619 * POWER_BUTTON event should not reach userspace ]
620 *
621 * However, we do generate a small hint for userspace in the form of
622 * a wakeup event. We flag this condition for now and generate the
623 * event later, as we're currently too early in resume to be able to
624 * generate wakeup events.
625 */
626 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
627 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
628
629 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
630
631 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
632 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
633 /* Flag for later */
634 pwr_btn_event_pending = true;
635 }
636 }
637
638 /*
639 * Disable and clear GPE status before interrupt is enabled. Some GPEs
640 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
641 * acpi_leave_sleep_state will reenable specific GPEs later
642 */
643 acpi_disable_all_gpes();
644 /* Allow EC transactions to happen. */
645 acpi_ec_unblock_transactions();
646
647 suspend_nvs_restore();
648
649 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
650}
651
652static int acpi_suspend_state_valid(suspend_state_t pm_state)
653{
654 u32 acpi_state;
655
656 switch (pm_state) {
657 case PM_SUSPEND_ON:
658 case PM_SUSPEND_STANDBY:
659 case PM_SUSPEND_MEM:
660 acpi_state = acpi_suspend_states[pm_state];
661
662 return sleep_states[acpi_state];
663 default:
664 return 0;
665 }
666}
667
668static const struct platform_suspend_ops acpi_suspend_ops = {
669 .valid = acpi_suspend_state_valid,
670 .begin = acpi_suspend_begin,
671 .prepare_late = acpi_pm_prepare,
672 .enter = acpi_suspend_enter,
673 .wake = acpi_pm_finish,
674 .end = acpi_pm_end,
675};
676
677/**
678 * acpi_suspend_begin_old - Set the target system sleep state to the
679 * state associated with given @pm_state, if supported, and
680 * execute the _PTS control method. This function is used if the
681 * pre-ACPI 2.0 suspend ordering has been requested.
682 */
683static int acpi_suspend_begin_old(suspend_state_t pm_state)
684{
685 int error = acpi_suspend_begin(pm_state);
686 if (!error)
687 error = __acpi_pm_prepare();
688
689 return error;
690}
691
692/*
693 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
694 * been requested.
695 */
696static const struct platform_suspend_ops acpi_suspend_ops_old = {
697 .valid = acpi_suspend_state_valid,
698 .begin = acpi_suspend_begin_old,
699 .prepare_late = acpi_pm_pre_suspend,
700 .enter = acpi_suspend_enter,
701 .wake = acpi_pm_finish,
702 .end = acpi_pm_end,
703 .recover = acpi_pm_finish,
704};
705
706static bool s2idle_wakeup;
707
708int acpi_s2idle_begin(void)
709{
710 acpi_scan_lock_acquire();
711 return 0;
712}
713
714int acpi_s2idle_prepare(void)
715{
716 if (acpi_sci_irq_valid()) {
717 enable_irq_wake(acpi_sci_irq);
718 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
719 }
720
721 acpi_enable_wakeup_devices(ACPI_STATE_S0);
722
723 /* Change the configuration of GPEs to avoid spurious wakeup. */
724 acpi_enable_all_wakeup_gpes();
725 acpi_os_wait_events_complete();
726
727 s2idle_wakeup = true;
728 return 0;
729}
730
731bool acpi_s2idle_wake(void)
732{
733 if (!acpi_sci_irq_valid())
734 return pm_wakeup_pending();
735
736 while (pm_wakeup_pending()) {
737 /*
738 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
739 * SCI has not triggered while suspended, so bail out (the
740 * wakeup is pending anyway and the SCI is not the source of
741 * it).
742 */
743 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
744 pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
745 return true;
746 }
747
748 /*
749 * If the status bit of any enabled fixed event is set, the
750 * wakeup is regarded as valid.
751 */
752 if (acpi_any_fixed_event_status_set()) {
753 pm_pr_dbg("ACPI fixed event wakeup\n");
754 return true;
755 }
756
757 /* Check wakeups from drivers sharing the SCI. */
758 if (acpi_check_wakeup_handlers()) {
759 pm_pr_dbg("ACPI custom handler wakeup\n");
760 return true;
761 }
762
763 /*
764 * Check non-EC GPE wakeups and if there are none, cancel the
765 * SCI-related wakeup and dispatch the EC GPE.
766 */
767 if (acpi_ec_dispatch_gpe()) {
768 pm_pr_dbg("ACPI non-EC GPE wakeup\n");
769 return true;
770 }
771
772 acpi_os_wait_events_complete();
773
774 /*
775 * The SCI is in the "suspended" state now and it cannot produce
776 * new wakeup events till the rearming below, so if any of them
777 * are pending here, they must be resulting from the processing
778 * of EC events above or coming from somewhere else.
779 */
780 if (pm_wakeup_pending()) {
781 pm_pr_dbg("Wakeup after ACPI Notify sync\n");
782 return true;
783 }
784
785 pm_pr_dbg("Rearming ACPI SCI for wakeup\n");
786
787 pm_wakeup_clear(acpi_sci_irq);
788 rearm_wake_irq(acpi_sci_irq);
789 }
790
791 return false;
792}
793
794void acpi_s2idle_restore(void)
795{
796 /*
797 * Drain pending events before restoring the working-state configuration
798 * of GPEs.
799 */
800 acpi_os_wait_events_complete(); /* synchronize GPE processing */
801 acpi_ec_flush_work(); /* flush the EC driver's workqueues */
802 acpi_os_wait_events_complete(); /* synchronize Notify handling */
803
804 s2idle_wakeup = false;
805
806 acpi_enable_all_runtime_gpes();
807
808 acpi_disable_wakeup_devices(ACPI_STATE_S0);
809
810 if (acpi_sci_irq_valid()) {
811 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
812 disable_irq_wake(acpi_sci_irq);
813 }
814}
815
816void acpi_s2idle_end(void)
817{
818 acpi_scan_lock_release();
819}
820
821static const struct platform_s2idle_ops acpi_s2idle_ops = {
822 .begin = acpi_s2idle_begin,
823 .prepare = acpi_s2idle_prepare,
824 .wake = acpi_s2idle_wake,
825 .restore = acpi_s2idle_restore,
826 .end = acpi_s2idle_end,
827};
828
829void __weak acpi_s2idle_setup(void)
830{
831 if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)
832 pr_info("Efficient low-power S0 idle declared\n");
833
834 s2idle_set_ops(&acpi_s2idle_ops);
835}
836
837static void acpi_sleep_suspend_setup(void)
838{
839 bool suspend_ops_needed = false;
840 int i;
841
842 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
843 if (acpi_sleep_state_supported(i)) {
844 sleep_states[i] = 1;
845 suspend_ops_needed = true;
846 }
847
848 if (suspend_ops_needed)
849 suspend_set_ops(old_suspend_ordering ?
850 &acpi_suspend_ops_old : &acpi_suspend_ops);
851
852 acpi_s2idle_setup();
853}
854
855#else /* !CONFIG_SUSPEND */
856#define s2idle_wakeup (false)
857static inline void acpi_sleep_suspend_setup(void) {}
858#endif /* !CONFIG_SUSPEND */
859
860bool acpi_s2idle_wakeup(void)
861{
862 return s2idle_wakeup;
863}
864
865#ifdef CONFIG_PM_SLEEP
866static u32 saved_bm_rld;
867
868static int acpi_save_bm_rld(void)
869{
870 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
871 return 0;
872}
873
874static void acpi_restore_bm_rld(void)
875{
876 u32 resumed_bm_rld = 0;
877
878 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
879 if (resumed_bm_rld == saved_bm_rld)
880 return;
881
882 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
883}
884
885static struct syscore_ops acpi_sleep_syscore_ops = {
886 .suspend = acpi_save_bm_rld,
887 .resume = acpi_restore_bm_rld,
888};
889
890static void acpi_sleep_syscore_init(void)
891{
892 register_syscore_ops(&acpi_sleep_syscore_ops);
893}
894#else
895static inline void acpi_sleep_syscore_init(void) {}
896#endif /* CONFIG_PM_SLEEP */
897
898#ifdef CONFIG_HIBERNATION
899static unsigned long s4_hardware_signature;
900static struct acpi_table_facs *facs;
901int acpi_check_s4_hw_signature = -1; /* Default behaviour is just to warn */
902
903static int acpi_hibernation_begin(pm_message_t stage)
904{
905 if (!nvs_nosave) {
906 int error = suspend_nvs_alloc();
907 if (error)
908 return error;
909 }
910
911 if (stage.event == PM_EVENT_HIBERNATE)
912 pm_set_suspend_via_firmware();
913
914 acpi_pm_start(ACPI_STATE_S4);
915 return 0;
916}
917
918static int acpi_hibernation_enter(void)
919{
920 acpi_status status = AE_OK;
921
922 /* This shouldn't return. If it returns, we have a problem */
923 status = acpi_enter_sleep_state(ACPI_STATE_S4);
924 /* Reprogram control registers */
925 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
926
927 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
928}
929
930static void acpi_hibernation_leave(void)
931{
932 pm_set_resume_via_firmware();
933 /*
934 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
935 * enable it here.
936 */
937 acpi_enable();
938 /* Reprogram control registers */
939 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
940 /* Check the hardware signature */
941 if (facs && s4_hardware_signature != facs->hardware_signature)
942 pr_crit("Hardware changed while hibernated, success doubtful!\n");
943 /* Restore the NVS memory area */
944 suspend_nvs_restore();
945 /* Allow EC transactions to happen. */
946 acpi_ec_unblock_transactions();
947}
948
949static void acpi_pm_thaw(void)
950{
951 acpi_ec_unblock_transactions();
952 acpi_enable_all_runtime_gpes();
953}
954
955static const struct platform_hibernation_ops acpi_hibernation_ops = {
956 .begin = acpi_hibernation_begin,
957 .end = acpi_pm_end,
958 .pre_snapshot = acpi_pm_prepare,
959 .finish = acpi_pm_finish,
960 .prepare = acpi_pm_prepare,
961 .enter = acpi_hibernation_enter,
962 .leave = acpi_hibernation_leave,
963 .pre_restore = acpi_pm_freeze,
964 .restore_cleanup = acpi_pm_thaw,
965};
966
967/**
968 * acpi_hibernation_begin_old - Set the target system sleep state to
969 * ACPI_STATE_S4 and execute the _PTS control method. This
970 * function is used if the pre-ACPI 2.0 suspend ordering has been
971 * requested.
972 */
973static int acpi_hibernation_begin_old(pm_message_t stage)
974{
975 int error;
976 /*
977 * The _TTS object should always be evaluated before the _PTS object.
978 * When the old_suspended_ordering is true, the _PTS object is
979 * evaluated in the acpi_sleep_prepare.
980 */
981 acpi_sleep_tts_switch(ACPI_STATE_S4);
982
983 error = acpi_sleep_prepare(ACPI_STATE_S4);
984 if (error)
985 return error;
986
987 if (!nvs_nosave) {
988 error = suspend_nvs_alloc();
989 if (error)
990 return error;
991 }
992
993 if (stage.event == PM_EVENT_HIBERNATE)
994 pm_set_suspend_via_firmware();
995
996 acpi_target_sleep_state = ACPI_STATE_S4;
997 acpi_scan_lock_acquire();
998 return 0;
999}
1000
1001/*
1002 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1003 * been requested.
1004 */
1005static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1006 .begin = acpi_hibernation_begin_old,
1007 .end = acpi_pm_end,
1008 .pre_snapshot = acpi_pm_pre_suspend,
1009 .prepare = acpi_pm_freeze,
1010 .finish = acpi_pm_finish,
1011 .enter = acpi_hibernation_enter,
1012 .leave = acpi_hibernation_leave,
1013 .pre_restore = acpi_pm_freeze,
1014 .restore_cleanup = acpi_pm_thaw,
1015 .recover = acpi_pm_finish,
1016};
1017
1018static void acpi_sleep_hibernate_setup(void)
1019{
1020 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1021 return;
1022
1023 hibernation_set_ops(old_suspend_ordering ?
1024 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1025 sleep_states[ACPI_STATE_S4] = 1;
1026 if (!acpi_check_s4_hw_signature)
1027 return;
1028
1029 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1030 if (facs) {
1031 /*
1032 * s4_hardware_signature is the local variable which is just
1033 * used to warn about mismatch after we're attempting to
1034 * resume (in violation of the ACPI specification.)
1035 */
1036 s4_hardware_signature = facs->hardware_signature;
1037
1038 if (acpi_check_s4_hw_signature > 0) {
1039 /*
1040 * If we're actually obeying the ACPI specification
1041 * then the signature is written out as part of the
1042 * swsusp header, in order to allow the boot kernel
1043 * to gracefully decline to resume.
1044 */
1045 swsusp_hardware_signature = facs->hardware_signature;
1046 }
1047 }
1048}
1049#else /* !CONFIG_HIBERNATION */
1050static inline void acpi_sleep_hibernate_setup(void) {}
1051#endif /* !CONFIG_HIBERNATION */
1052
1053static int acpi_power_off_prepare(struct sys_off_data *data)
1054{
1055 /* Prepare to power off the system */
1056 acpi_sleep_prepare(ACPI_STATE_S5);
1057 acpi_disable_all_gpes();
1058 acpi_os_wait_events_complete();
1059 return NOTIFY_DONE;
1060}
1061
1062static int acpi_power_off(struct sys_off_data *data)
1063{
1064 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1065 pr_debug("%s called\n", __func__);
1066 local_irq_disable();
1067 acpi_enter_sleep_state(ACPI_STATE_S5);
1068 return NOTIFY_DONE;
1069}
1070
1071int __init acpi_sleep_init(void)
1072{
1073 char supported[ACPI_S_STATE_COUNT * 3 + 1];
1074 char *pos = supported;
1075 int i;
1076
1077 acpi_sleep_dmi_check();
1078
1079 sleep_states[ACPI_STATE_S0] = 1;
1080
1081 acpi_sleep_syscore_init();
1082 acpi_sleep_suspend_setup();
1083 acpi_sleep_hibernate_setup();
1084
1085 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1086 sleep_states[ACPI_STATE_S5] = 1;
1087
1088 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF_PREPARE,
1089 SYS_OFF_PRIO_FIRMWARE,
1090 acpi_power_off_prepare, NULL);
1091
1092 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
1093 SYS_OFF_PRIO_FIRMWARE,
1094 acpi_power_off, NULL);
1095
1096 /*
1097 * Windows uses S5 for reboot, so some BIOSes depend on it to
1098 * perform proper reboot.
1099 */
1100 register_sys_off_handler(SYS_OFF_MODE_RESTART_PREPARE,
1101 SYS_OFF_PRIO_FIRMWARE,
1102 acpi_power_off_prepare, NULL);
1103 } else {
1104 acpi_no_s5 = true;
1105 }
1106
1107 supported[0] = 0;
1108 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1109 if (sleep_states[i])
1110 pos += sprintf(pos, " S%d", i);
1111 }
1112 pr_info("(supports%s)\n", supported);
1113
1114 /*
1115 * Register the tts_notifier to reboot notifier list so that the _TTS
1116 * object can also be evaluated when the system enters S5.
1117 */
1118 register_reboot_notifier(&tts_notifier);
1119 return 0;
1120}