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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/*
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/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 printk(KERN_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
63static int acpi_sleep_prepare(u32 acpi_state)
64{
65#ifdef CONFIG_ACPI_SLEEP
66 /* do we have a wakeup address for S2 and S3? */
67 if (acpi_state == ACPI_STATE_S3) {
68 if (!acpi_wakeup_address)
69 return -EFAULT;
70 acpi_set_waking_vector(acpi_wakeup_address);
71
72 }
73 ACPI_FLUSH_CPU_CACHE();
74#endif
75 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
76 acpi_state);
77 acpi_enable_wakeup_devices(acpi_state);
78 acpi_enter_sleep_state_prep(acpi_state);
79 return 0;
80}
81
82static bool acpi_sleep_state_supported(u8 sleep_state)
83{
84 acpi_status status;
85 u8 type_a, type_b;
86
87 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
88 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
89 || (acpi_gbl_FADT.sleep_control.address
90 && acpi_gbl_FADT.sleep_status.address));
91}
92
93#ifdef CONFIG_ACPI_SLEEP
94static u32 acpi_target_sleep_state = ACPI_STATE_S0;
95
96u32 acpi_target_system_state(void)
97{
98 return acpi_target_sleep_state;
99}
100EXPORT_SYMBOL_GPL(acpi_target_system_state);
101
102static bool pwr_btn_event_pending;
103
104/*
105 * The ACPI specification wants us to save NVS memory regions during hibernation
106 * and to restore them during the subsequent resume. Windows does that also for
107 * suspend to RAM. However, it is known that this mechanism does not work on
108 * all machines, so we allow the user to disable it with the help of the
109 * 'acpi_sleep=nonvs' kernel command line option.
110 */
111static bool nvs_nosave;
112
113void __init acpi_nvs_nosave(void)
114{
115 nvs_nosave = true;
116}
117
118/*
119 * The ACPI specification wants us to save NVS memory regions during hibernation
120 * but says nothing about saving NVS during S3. Not all versions of Windows
121 * save NVS on S3 suspend either, and it is clear that not all systems need
122 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
123 * user to disable saving NVS on S3 if their system does not require it, but
124 * continue to save/restore NVS for S4 as specified.
125 */
126static bool nvs_nosave_s3;
127
128void __init acpi_nvs_nosave_s3(void)
129{
130 nvs_nosave_s3 = true;
131}
132
133static int __init init_nvs_save_s3(const struct dmi_system_id *d)
134{
135 nvs_nosave_s3 = false;
136 return 0;
137}
138
139/*
140 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
141 * user to request that behavior by using the 'acpi_old_suspend_ordering'
142 * kernel command line option that causes the following variable to be set.
143 */
144static bool old_suspend_ordering;
145
146void __init acpi_old_suspend_ordering(void)
147{
148 old_suspend_ordering = true;
149}
150
151static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
152{
153 acpi_old_suspend_ordering();
154 return 0;
155}
156
157static int __init init_nvs_nosave(const struct dmi_system_id *d)
158{
159 acpi_nvs_nosave();
160 return 0;
161}
162
163static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
164 {
165 .callback = init_old_suspend_ordering,
166 .ident = "Abit KN9 (nForce4 variant)",
167 .matches = {
168 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
169 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
170 },
171 },
172 {
173 .callback = init_old_suspend_ordering,
174 .ident = "HP xw4600 Workstation",
175 .matches = {
176 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
177 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
178 },
179 },
180 {
181 .callback = init_old_suspend_ordering,
182 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
183 .matches = {
184 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
185 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
186 },
187 },
188 {
189 .callback = init_old_suspend_ordering,
190 .ident = "Panasonic CF51-2L",
191 .matches = {
192 DMI_MATCH(DMI_BOARD_VENDOR,
193 "Matsushita Electric Industrial Co.,Ltd."),
194 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
195 },
196 },
197 {
198 .callback = init_nvs_nosave,
199 .ident = "Sony Vaio VGN-FW41E_H",
200 .matches = {
201 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
202 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
203 },
204 },
205 {
206 .callback = init_nvs_nosave,
207 .ident = "Sony Vaio VGN-FW21E",
208 .matches = {
209 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
211 },
212 },
213 {
214 .callback = init_nvs_nosave,
215 .ident = "Sony Vaio VGN-FW21M",
216 .matches = {
217 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
219 },
220 },
221 {
222 .callback = init_nvs_nosave,
223 .ident = "Sony Vaio VPCEB17FX",
224 .matches = {
225 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
226 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
227 },
228 },
229 {
230 .callback = init_nvs_nosave,
231 .ident = "Sony Vaio VGN-SR11M",
232 .matches = {
233 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
234 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
235 },
236 },
237 {
238 .callback = init_nvs_nosave,
239 .ident = "Everex StepNote Series",
240 .matches = {
241 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
242 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
243 },
244 },
245 {
246 .callback = init_nvs_nosave,
247 .ident = "Sony Vaio VPCEB1Z1E",
248 .matches = {
249 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
250 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
251 },
252 },
253 {
254 .callback = init_nvs_nosave,
255 .ident = "Sony Vaio VGN-NW130D",
256 .matches = {
257 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
259 },
260 },
261 {
262 .callback = init_nvs_nosave,
263 .ident = "Sony Vaio VPCCW29FX",
264 .matches = {
265 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
267 },
268 },
269 {
270 .callback = init_nvs_nosave,
271 .ident = "Averatec AV1020-ED2",
272 .matches = {
273 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
274 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
275 },
276 },
277 {
278 .callback = init_old_suspend_ordering,
279 .ident = "Asus A8N-SLI DELUXE",
280 .matches = {
281 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
282 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
283 },
284 },
285 {
286 .callback = init_old_suspend_ordering,
287 .ident = "Asus A8N-SLI Premium",
288 .matches = {
289 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
290 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
291 },
292 },
293 {
294 .callback = init_nvs_nosave,
295 .ident = "Sony Vaio VGN-SR26GN_P",
296 .matches = {
297 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
298 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
299 },
300 },
301 {
302 .callback = init_nvs_nosave,
303 .ident = "Sony Vaio VPCEB1S1E",
304 .matches = {
305 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
306 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
307 },
308 },
309 {
310 .callback = init_nvs_nosave,
311 .ident = "Sony Vaio VGN-FW520F",
312 .matches = {
313 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
315 },
316 },
317 {
318 .callback = init_nvs_nosave,
319 .ident = "Asus K54C",
320 .matches = {
321 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
322 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
323 },
324 },
325 {
326 .callback = init_nvs_nosave,
327 .ident = "Asus K54HR",
328 .matches = {
329 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
331 },
332 },
333 /*
334 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
335 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
336 * saving during S3.
337 */
338 {
339 .callback = init_nvs_save_s3,
340 .ident = "Lenovo G50-45",
341 .matches = {
342 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
343 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
344 },
345 },
346 {},
347};
348
349static void __init acpi_sleep_dmi_check(void)
350{
351 int year;
352
353 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
354 acpi_nvs_nosave_s3();
355
356 dmi_check_system(acpisleep_dmi_table);
357}
358
359/**
360 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
361 */
362static int acpi_pm_freeze(void)
363{
364 acpi_disable_all_gpes();
365 acpi_os_wait_events_complete();
366 acpi_ec_block_transactions();
367 return 0;
368}
369
370/**
371 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
372 */
373static int acpi_pm_pre_suspend(void)
374{
375 acpi_pm_freeze();
376 return suspend_nvs_save();
377}
378
379/**
380 * __acpi_pm_prepare - Prepare the platform to enter the target state.
381 *
382 * If necessary, set the firmware waking vector and do arch-specific
383 * nastiness to get the wakeup code to the waking vector.
384 */
385static int __acpi_pm_prepare(void)
386{
387 int error = acpi_sleep_prepare(acpi_target_sleep_state);
388 if (error)
389 acpi_target_sleep_state = ACPI_STATE_S0;
390
391 return error;
392}
393
394/**
395 * acpi_pm_prepare - Prepare the platform to enter the target sleep
396 * state and disable the GPEs.
397 */
398static int acpi_pm_prepare(void)
399{
400 int error = __acpi_pm_prepare();
401 if (!error)
402 error = acpi_pm_pre_suspend();
403
404 return error;
405}
406
407static int find_powerf_dev(struct device *dev, void *data)
408{
409 struct acpi_device *device = to_acpi_device(dev);
410 const char *hid = acpi_device_hid(device);
411
412 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
413}
414
415/**
416 * acpi_pm_finish - Instruct the platform to leave a sleep state.
417 *
418 * This is called after we wake back up (or if entering the sleep state
419 * failed).
420 */
421static void acpi_pm_finish(void)
422{
423 struct device *pwr_btn_dev;
424 u32 acpi_state = acpi_target_sleep_state;
425
426 acpi_ec_unblock_transactions();
427 suspend_nvs_free();
428
429 if (acpi_state == ACPI_STATE_S0)
430 return;
431
432 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
433 acpi_state);
434 acpi_disable_wakeup_devices(acpi_state);
435 acpi_leave_sleep_state(acpi_state);
436
437 /* reset firmware waking vector */
438 acpi_set_waking_vector(0);
439
440 acpi_target_sleep_state = ACPI_STATE_S0;
441
442 acpi_resume_power_resources();
443
444 /* If we were woken with the fixed power button, provide a small
445 * hint to userspace in the form of a wakeup event on the fixed power
446 * button device (if it can be found).
447 *
448 * We delay the event generation til now, as the PM layer requires
449 * timekeeping to be running before we generate events. */
450 if (!pwr_btn_event_pending)
451 return;
452
453 pwr_btn_event_pending = false;
454 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
455 find_powerf_dev);
456 if (pwr_btn_dev) {
457 pm_wakeup_event(pwr_btn_dev, 0);
458 put_device(pwr_btn_dev);
459 }
460}
461
462/**
463 * acpi_pm_start - Start system PM transition.
464 */
465static void acpi_pm_start(u32 acpi_state)
466{
467 acpi_target_sleep_state = acpi_state;
468 acpi_sleep_tts_switch(acpi_target_sleep_state);
469 acpi_scan_lock_acquire();
470}
471
472/**
473 * acpi_pm_end - Finish up system PM transition.
474 */
475static void acpi_pm_end(void)
476{
477 acpi_scan_lock_release();
478 /*
479 * This is necessary in case acpi_pm_finish() is not called during a
480 * failing transition to a sleep state.
481 */
482 acpi_target_sleep_state = ACPI_STATE_S0;
483 acpi_sleep_tts_switch(acpi_target_sleep_state);
484}
485#else /* !CONFIG_ACPI_SLEEP */
486#define acpi_target_sleep_state ACPI_STATE_S0
487static inline void acpi_sleep_dmi_check(void) {}
488#endif /* CONFIG_ACPI_SLEEP */
489
490#ifdef CONFIG_SUSPEND
491static u32 acpi_suspend_states[] = {
492 [PM_SUSPEND_ON] = ACPI_STATE_S0,
493 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
494 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
495 [PM_SUSPEND_MAX] = ACPI_STATE_S5
496};
497
498/**
499 * acpi_suspend_begin - Set the target system sleep state to the state
500 * associated with given @pm_state, if supported.
501 */
502static int acpi_suspend_begin(suspend_state_t pm_state)
503{
504 u32 acpi_state = acpi_suspend_states[pm_state];
505 int error;
506
507 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
508 if (error)
509 return error;
510
511 if (!sleep_states[acpi_state]) {
512 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
513 return -ENOSYS;
514 }
515 if (acpi_state > ACPI_STATE_S1)
516 pm_set_suspend_via_firmware();
517
518 acpi_pm_start(acpi_state);
519 return 0;
520}
521
522/**
523 * acpi_suspend_enter - Actually enter a sleep state.
524 * @pm_state: ignored
525 *
526 * Flush caches and go to sleep. For STR we have to call arch-specific
527 * assembly, which in turn call acpi_enter_sleep_state().
528 * It's unfortunate, but it works. Please fix if you're feeling frisky.
529 */
530static int acpi_suspend_enter(suspend_state_t pm_state)
531{
532 acpi_status status = AE_OK;
533 u32 acpi_state = acpi_target_sleep_state;
534 int error;
535
536 ACPI_FLUSH_CPU_CACHE();
537
538 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
539 switch (acpi_state) {
540 case ACPI_STATE_S1:
541 barrier();
542 status = acpi_enter_sleep_state(acpi_state);
543 break;
544
545 case ACPI_STATE_S3:
546 if (!acpi_suspend_lowlevel)
547 return -ENOSYS;
548 error = acpi_suspend_lowlevel();
549 if (error)
550 return error;
551 pr_info(PREFIX "Low-level resume complete\n");
552 pm_set_resume_via_firmware();
553 break;
554 }
555 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
556
557 /* This violates the spec but is required for bug compatibility. */
558 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
559
560 /* Reprogram control registers */
561 acpi_leave_sleep_state_prep(acpi_state);
562
563 /* ACPI 3.0 specs (P62) says that it's the responsibility
564 * of the OSPM to clear the status bit [ implying that the
565 * POWER_BUTTON event should not reach userspace ]
566 *
567 * However, we do generate a small hint for userspace in the form of
568 * a wakeup event. We flag this condition for now and generate the
569 * event later, as we're currently too early in resume to be able to
570 * generate wakeup events.
571 */
572 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
573 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
574
575 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
576
577 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
578 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
579 /* Flag for later */
580 pwr_btn_event_pending = true;
581 }
582 }
583
584 /*
585 * Disable and clear GPE status before interrupt is enabled. Some GPEs
586 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
587 * acpi_leave_sleep_state will reenable specific GPEs later
588 */
589 acpi_disable_all_gpes();
590 /* Allow EC transactions to happen. */
591 acpi_ec_unblock_transactions();
592
593 suspend_nvs_restore();
594
595 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
596}
597
598static int acpi_suspend_state_valid(suspend_state_t pm_state)
599{
600 u32 acpi_state;
601
602 switch (pm_state) {
603 case PM_SUSPEND_ON:
604 case PM_SUSPEND_STANDBY:
605 case PM_SUSPEND_MEM:
606 acpi_state = acpi_suspend_states[pm_state];
607
608 return sleep_states[acpi_state];
609 default:
610 return 0;
611 }
612}
613
614static const struct platform_suspend_ops acpi_suspend_ops = {
615 .valid = acpi_suspend_state_valid,
616 .begin = acpi_suspend_begin,
617 .prepare_late = acpi_pm_prepare,
618 .enter = acpi_suspend_enter,
619 .wake = acpi_pm_finish,
620 .end = acpi_pm_end,
621};
622
623/**
624 * acpi_suspend_begin_old - Set the target system sleep state to the
625 * state associated with given @pm_state, if supported, and
626 * execute the _PTS control method. This function is used if the
627 * pre-ACPI 2.0 suspend ordering has been requested.
628 */
629static int acpi_suspend_begin_old(suspend_state_t pm_state)
630{
631 int error = acpi_suspend_begin(pm_state);
632 if (!error)
633 error = __acpi_pm_prepare();
634
635 return error;
636}
637
638/*
639 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
640 * been requested.
641 */
642static const struct platform_suspend_ops acpi_suspend_ops_old = {
643 .valid = acpi_suspend_state_valid,
644 .begin = acpi_suspend_begin_old,
645 .prepare_late = acpi_pm_pre_suspend,
646 .enter = acpi_suspend_enter,
647 .wake = acpi_pm_finish,
648 .end = acpi_pm_end,
649 .recover = acpi_pm_finish,
650};
651
652static int acpi_freeze_begin(void)
653{
654 acpi_scan_lock_acquire();
655 return 0;
656}
657
658static int acpi_freeze_prepare(void)
659{
660 acpi_enable_wakeup_devices(ACPI_STATE_S0);
661 acpi_enable_all_wakeup_gpes();
662 acpi_os_wait_events_complete();
663 if (acpi_sci_irq_valid())
664 enable_irq_wake(acpi_sci_irq);
665 return 0;
666}
667
668static void acpi_freeze_restore(void)
669{
670 acpi_disable_wakeup_devices(ACPI_STATE_S0);
671 if (acpi_sci_irq_valid())
672 disable_irq_wake(acpi_sci_irq);
673 acpi_enable_all_runtime_gpes();
674}
675
676static void acpi_freeze_end(void)
677{
678 acpi_scan_lock_release();
679}
680
681static const struct platform_freeze_ops acpi_freeze_ops = {
682 .begin = acpi_freeze_begin,
683 .prepare = acpi_freeze_prepare,
684 .restore = acpi_freeze_restore,
685 .end = acpi_freeze_end,
686};
687
688static void acpi_sleep_suspend_setup(void)
689{
690 int i;
691
692 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
693 if (acpi_sleep_state_supported(i))
694 sleep_states[i] = 1;
695
696 suspend_set_ops(old_suspend_ordering ?
697 &acpi_suspend_ops_old : &acpi_suspend_ops);
698 freeze_set_ops(&acpi_freeze_ops);
699}
700
701#else /* !CONFIG_SUSPEND */
702static inline void acpi_sleep_suspend_setup(void) {}
703#endif /* !CONFIG_SUSPEND */
704
705#ifdef CONFIG_PM_SLEEP
706static u32 saved_bm_rld;
707
708static int acpi_save_bm_rld(void)
709{
710 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
711 return 0;
712}
713
714static void acpi_restore_bm_rld(void)
715{
716 u32 resumed_bm_rld = 0;
717
718 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
719 if (resumed_bm_rld == saved_bm_rld)
720 return;
721
722 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
723}
724
725static struct syscore_ops acpi_sleep_syscore_ops = {
726 .suspend = acpi_save_bm_rld,
727 .resume = acpi_restore_bm_rld,
728};
729
730void acpi_sleep_syscore_init(void)
731{
732 register_syscore_ops(&acpi_sleep_syscore_ops);
733}
734#else
735static inline void acpi_sleep_syscore_init(void) {}
736#endif /* CONFIG_PM_SLEEP */
737
738#ifdef CONFIG_HIBERNATION
739static unsigned long s4_hardware_signature;
740static struct acpi_table_facs *facs;
741static bool nosigcheck;
742
743void __init acpi_no_s4_hw_signature(void)
744{
745 nosigcheck = true;
746}
747
748static int acpi_hibernation_begin(void)
749{
750 int error;
751
752 error = nvs_nosave ? 0 : suspend_nvs_alloc();
753 if (!error)
754 acpi_pm_start(ACPI_STATE_S4);
755
756 return error;
757}
758
759static int acpi_hibernation_enter(void)
760{
761 acpi_status status = AE_OK;
762
763 ACPI_FLUSH_CPU_CACHE();
764
765 /* This shouldn't return. If it returns, we have a problem */
766 status = acpi_enter_sleep_state(ACPI_STATE_S4);
767 /* Reprogram control registers */
768 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
769
770 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
771}
772
773static void acpi_hibernation_leave(void)
774{
775 pm_set_resume_via_firmware();
776 /*
777 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
778 * enable it here.
779 */
780 acpi_enable();
781 /* Reprogram control registers */
782 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
783 /* Check the hardware signature */
784 if (facs && s4_hardware_signature != facs->hardware_signature)
785 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
786 /* Restore the NVS memory area */
787 suspend_nvs_restore();
788 /* Allow EC transactions to happen. */
789 acpi_ec_unblock_transactions();
790}
791
792static void acpi_pm_thaw(void)
793{
794 acpi_ec_unblock_transactions();
795 acpi_enable_all_runtime_gpes();
796}
797
798static const struct platform_hibernation_ops acpi_hibernation_ops = {
799 .begin = acpi_hibernation_begin,
800 .end = acpi_pm_end,
801 .pre_snapshot = acpi_pm_prepare,
802 .finish = acpi_pm_finish,
803 .prepare = acpi_pm_prepare,
804 .enter = acpi_hibernation_enter,
805 .leave = acpi_hibernation_leave,
806 .pre_restore = acpi_pm_freeze,
807 .restore_cleanup = acpi_pm_thaw,
808};
809
810/**
811 * acpi_hibernation_begin_old - Set the target system sleep state to
812 * ACPI_STATE_S4 and execute the _PTS control method. This
813 * function is used if the pre-ACPI 2.0 suspend ordering has been
814 * requested.
815 */
816static int acpi_hibernation_begin_old(void)
817{
818 int error;
819 /*
820 * The _TTS object should always be evaluated before the _PTS object.
821 * When the old_suspended_ordering is true, the _PTS object is
822 * evaluated in the acpi_sleep_prepare.
823 */
824 acpi_sleep_tts_switch(ACPI_STATE_S4);
825
826 error = acpi_sleep_prepare(ACPI_STATE_S4);
827
828 if (!error) {
829 if (!nvs_nosave)
830 error = suspend_nvs_alloc();
831 if (!error) {
832 acpi_target_sleep_state = ACPI_STATE_S4;
833 acpi_scan_lock_acquire();
834 }
835 }
836 return error;
837}
838
839/*
840 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
841 * been requested.
842 */
843static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
844 .begin = acpi_hibernation_begin_old,
845 .end = acpi_pm_end,
846 .pre_snapshot = acpi_pm_pre_suspend,
847 .prepare = acpi_pm_freeze,
848 .finish = acpi_pm_finish,
849 .enter = acpi_hibernation_enter,
850 .leave = acpi_hibernation_leave,
851 .pre_restore = acpi_pm_freeze,
852 .restore_cleanup = acpi_pm_thaw,
853 .recover = acpi_pm_finish,
854};
855
856static void acpi_sleep_hibernate_setup(void)
857{
858 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
859 return;
860
861 hibernation_set_ops(old_suspend_ordering ?
862 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
863 sleep_states[ACPI_STATE_S4] = 1;
864 if (nosigcheck)
865 return;
866
867 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
868 if (facs)
869 s4_hardware_signature = facs->hardware_signature;
870}
871#else /* !CONFIG_HIBERNATION */
872static inline void acpi_sleep_hibernate_setup(void) {}
873#endif /* !CONFIG_HIBERNATION */
874
875static void acpi_power_off_prepare(void)
876{
877 /* Prepare to power off the system */
878 acpi_sleep_prepare(ACPI_STATE_S5);
879 acpi_disable_all_gpes();
880 acpi_os_wait_events_complete();
881}
882
883static void acpi_power_off(void)
884{
885 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
886 printk(KERN_DEBUG "%s called\n", __func__);
887 local_irq_disable();
888 acpi_enter_sleep_state(ACPI_STATE_S5);
889}
890
891int __init acpi_sleep_init(void)
892{
893 char supported[ACPI_S_STATE_COUNT * 3 + 1];
894 char *pos = supported;
895 int i;
896
897 acpi_sleep_dmi_check();
898
899 sleep_states[ACPI_STATE_S0] = 1;
900
901 acpi_sleep_syscore_init();
902 acpi_sleep_suspend_setup();
903 acpi_sleep_hibernate_setup();
904
905 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
906 sleep_states[ACPI_STATE_S5] = 1;
907 pm_power_off_prepare = acpi_power_off_prepare;
908 pm_power_off = acpi_power_off;
909 } else {
910 acpi_no_s5 = true;
911 }
912
913 supported[0] = 0;
914 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
915 if (sleep_states[i])
916 pos += sprintf(pos, " S%d", i);
917 }
918 pr_info(PREFIX "(supports%s)\n", supported);
919
920 /*
921 * Register the tts_notifier to reboot notifier list so that the _TTS
922 * object can also be evaluated when the system enters S5.
923 */
924 register_reboot_notifier(&tts_notifier);
925 return 0;
926}