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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/suspend.h>
18#include <linux/reboot.h>
19#include <linux/acpi.h>
20#include <linux/module.h>
21#include <asm/io.h>
22
23#include "internal.h"
24#include "sleep.h"
25
26static u8 sleep_states[ACPI_S_STATE_COUNT];
27
28static void acpi_sleep_tts_switch(u32 acpi_state)
29{
30 acpi_status status;
31
32 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
33 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
34 /*
35 * OS can't evaluate the _TTS object correctly. Some warning
36 * message will be printed. But it won't break anything.
37 */
38 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
39 }
40}
41
42static int tts_notify_reboot(struct notifier_block *this,
43 unsigned long code, void *x)
44{
45 acpi_sleep_tts_switch(ACPI_STATE_S5);
46 return NOTIFY_DONE;
47}
48
49static struct notifier_block tts_notifier = {
50 .notifier_call = tts_notify_reboot,
51 .next = NULL,
52 .priority = 0,
53};
54
55static int acpi_sleep_prepare(u32 acpi_state)
56{
57#ifdef CONFIG_ACPI_SLEEP
58 /* do we have a wakeup address for S2 and S3? */
59 if (acpi_state == ACPI_STATE_S3) {
60 if (!acpi_wakeup_address)
61 return -EFAULT;
62 acpi_set_firmware_waking_vector(acpi_wakeup_address);
63
64 }
65 ACPI_FLUSH_CPU_CACHE();
66#endif
67 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
68 acpi_state);
69 acpi_enable_wakeup_devices(acpi_state);
70 acpi_enter_sleep_state_prep(acpi_state);
71 return 0;
72}
73
74static bool acpi_sleep_state_supported(u8 sleep_state)
75{
76 acpi_status status;
77 u8 type_a, type_b;
78
79 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
80 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
81 || (acpi_gbl_FADT.sleep_control.address
82 && acpi_gbl_FADT.sleep_status.address));
83}
84
85#ifdef CONFIG_ACPI_SLEEP
86static u32 acpi_target_sleep_state = ACPI_STATE_S0;
87
88u32 acpi_target_system_state(void)
89{
90 return acpi_target_sleep_state;
91}
92
93static bool pwr_btn_event_pending;
94
95/*
96 * The ACPI specification wants us to save NVS memory regions during hibernation
97 * and to restore them during the subsequent resume. Windows does that also for
98 * suspend to RAM. However, it is known that this mechanism does not work on
99 * all machines, so we allow the user to disable it with the help of the
100 * 'acpi_sleep=nonvs' kernel command line option.
101 */
102static bool nvs_nosave;
103
104void __init acpi_nvs_nosave(void)
105{
106 nvs_nosave = true;
107}
108
109/*
110 * The ACPI specification wants us to save NVS memory regions during hibernation
111 * but says nothing about saving NVS during S3. Not all versions of Windows
112 * save NVS on S3 suspend either, and it is clear that not all systems need
113 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
114 * user to disable saving NVS on S3 if their system does not require it, but
115 * continue to save/restore NVS for S4 as specified.
116 */
117static bool nvs_nosave_s3;
118
119void __init acpi_nvs_nosave_s3(void)
120{
121 nvs_nosave_s3 = true;
122}
123
124/*
125 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
126 * user to request that behavior by using the 'acpi_old_suspend_ordering'
127 * kernel command line option that causes the following variable to be set.
128 */
129static bool old_suspend_ordering;
130
131void __init acpi_old_suspend_ordering(void)
132{
133 old_suspend_ordering = true;
134}
135
136static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
137{
138 acpi_old_suspend_ordering();
139 return 0;
140}
141
142static int __init init_nvs_nosave(const struct dmi_system_id *d)
143{
144 acpi_nvs_nosave();
145 return 0;
146}
147
148static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
149 {
150 .callback = init_old_suspend_ordering,
151 .ident = "Abit KN9 (nForce4 variant)",
152 .matches = {
153 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
154 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
155 },
156 },
157 {
158 .callback = init_old_suspend_ordering,
159 .ident = "HP xw4600 Workstation",
160 .matches = {
161 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
162 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
163 },
164 },
165 {
166 .callback = init_old_suspend_ordering,
167 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
168 .matches = {
169 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
170 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
171 },
172 },
173 {
174 .callback = init_old_suspend_ordering,
175 .ident = "Panasonic CF51-2L",
176 .matches = {
177 DMI_MATCH(DMI_BOARD_VENDOR,
178 "Matsushita Electric Industrial Co.,Ltd."),
179 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
180 },
181 },
182 {
183 .callback = init_nvs_nosave,
184 .ident = "Sony Vaio VGN-FW41E_H",
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
187 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
188 },
189 },
190 {
191 .callback = init_nvs_nosave,
192 .ident = "Sony Vaio VGN-FW21E",
193 .matches = {
194 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
195 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
196 },
197 },
198 {
199 .callback = init_nvs_nosave,
200 .ident = "Sony Vaio VGN-FW21M",
201 .matches = {
202 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
203 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
204 },
205 },
206 {
207 .callback = init_nvs_nosave,
208 .ident = "Sony Vaio VPCEB17FX",
209 .matches = {
210 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
211 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
212 },
213 },
214 {
215 .callback = init_nvs_nosave,
216 .ident = "Sony Vaio VGN-SR11M",
217 .matches = {
218 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
219 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
220 },
221 },
222 {
223 .callback = init_nvs_nosave,
224 .ident = "Everex StepNote Series",
225 .matches = {
226 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
227 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
228 },
229 },
230 {
231 .callback = init_nvs_nosave,
232 .ident = "Sony Vaio VPCEB1Z1E",
233 .matches = {
234 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
235 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
236 },
237 },
238 {
239 .callback = init_nvs_nosave,
240 .ident = "Sony Vaio VGN-NW130D",
241 .matches = {
242 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
243 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
244 },
245 },
246 {
247 .callback = init_nvs_nosave,
248 .ident = "Sony Vaio VPCCW29FX",
249 .matches = {
250 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
251 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
252 },
253 },
254 {
255 .callback = init_nvs_nosave,
256 .ident = "Averatec AV1020-ED2",
257 .matches = {
258 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
259 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
260 },
261 },
262 {
263 .callback = init_old_suspend_ordering,
264 .ident = "Asus A8N-SLI DELUXE",
265 .matches = {
266 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
267 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
268 },
269 },
270 {
271 .callback = init_old_suspend_ordering,
272 .ident = "Asus A8N-SLI Premium",
273 .matches = {
274 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
275 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
276 },
277 },
278 {
279 .callback = init_nvs_nosave,
280 .ident = "Sony Vaio VGN-SR26GN_P",
281 .matches = {
282 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
283 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
284 },
285 },
286 {
287 .callback = init_nvs_nosave,
288 .ident = "Sony Vaio VPCEB1S1E",
289 .matches = {
290 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
291 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
292 },
293 },
294 {
295 .callback = init_nvs_nosave,
296 .ident = "Sony Vaio VGN-FW520F",
297 .matches = {
298 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
299 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
300 },
301 },
302 {
303 .callback = init_nvs_nosave,
304 .ident = "Asus K54C",
305 .matches = {
306 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
307 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
308 },
309 },
310 {
311 .callback = init_nvs_nosave,
312 .ident = "Asus K54HR",
313 .matches = {
314 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
315 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
316 },
317 },
318 {},
319};
320
321static void acpi_sleep_dmi_check(void)
322{
323 dmi_check_system(acpisleep_dmi_table);
324}
325
326/**
327 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
328 */
329static int acpi_pm_freeze(void)
330{
331 acpi_disable_all_gpes();
332 acpi_os_wait_events_complete();
333 acpi_ec_block_transactions();
334 return 0;
335}
336
337/**
338 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
339 */
340static int acpi_pm_pre_suspend(void)
341{
342 acpi_pm_freeze();
343 return suspend_nvs_save();
344}
345
346/**
347 * __acpi_pm_prepare - Prepare the platform to enter the target state.
348 *
349 * If necessary, set the firmware waking vector and do arch-specific
350 * nastiness to get the wakeup code to the waking vector.
351 */
352static int __acpi_pm_prepare(void)
353{
354 int error = acpi_sleep_prepare(acpi_target_sleep_state);
355 if (error)
356 acpi_target_sleep_state = ACPI_STATE_S0;
357
358 return error;
359}
360
361/**
362 * acpi_pm_prepare - Prepare the platform to enter the target sleep
363 * state and disable the GPEs.
364 */
365static int acpi_pm_prepare(void)
366{
367 int error = __acpi_pm_prepare();
368 if (!error)
369 error = acpi_pm_pre_suspend();
370
371 return error;
372}
373
374static int find_powerf_dev(struct device *dev, void *data)
375{
376 struct acpi_device *device = to_acpi_device(dev);
377 const char *hid = acpi_device_hid(device);
378
379 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
380}
381
382/**
383 * acpi_pm_finish - Instruct the platform to leave a sleep state.
384 *
385 * This is called after we wake back up (or if entering the sleep state
386 * failed).
387 */
388static void acpi_pm_finish(void)
389{
390 struct device *pwr_btn_dev;
391 u32 acpi_state = acpi_target_sleep_state;
392
393 acpi_ec_unblock_transactions();
394 suspend_nvs_free();
395
396 if (acpi_state == ACPI_STATE_S0)
397 return;
398
399 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
400 acpi_state);
401 acpi_disable_wakeup_devices(acpi_state);
402 acpi_leave_sleep_state(acpi_state);
403
404 /* reset firmware waking vector */
405 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
406
407 acpi_target_sleep_state = ACPI_STATE_S0;
408
409 acpi_resume_power_resources();
410
411 /* If we were woken with the fixed power button, provide a small
412 * hint to userspace in the form of a wakeup event on the fixed power
413 * button device (if it can be found).
414 *
415 * We delay the event generation til now, as the PM layer requires
416 * timekeeping to be running before we generate events. */
417 if (!pwr_btn_event_pending)
418 return;
419
420 pwr_btn_event_pending = false;
421 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
422 find_powerf_dev);
423 if (pwr_btn_dev) {
424 pm_wakeup_event(pwr_btn_dev, 0);
425 put_device(pwr_btn_dev);
426 }
427}
428
429/**
430 * acpi_pm_start - Start system PM transition.
431 */
432static void acpi_pm_start(u32 acpi_state)
433{
434 acpi_target_sleep_state = acpi_state;
435 acpi_sleep_tts_switch(acpi_target_sleep_state);
436 acpi_scan_lock_acquire();
437}
438
439/**
440 * acpi_pm_end - Finish up system PM transition.
441 */
442static void acpi_pm_end(void)
443{
444 acpi_scan_lock_release();
445 /*
446 * This is necessary in case acpi_pm_finish() is not called during a
447 * failing transition to a sleep state.
448 */
449 acpi_target_sleep_state = ACPI_STATE_S0;
450 acpi_sleep_tts_switch(acpi_target_sleep_state);
451}
452#else /* !CONFIG_ACPI_SLEEP */
453#define acpi_target_sleep_state ACPI_STATE_S0
454static inline void acpi_sleep_dmi_check(void) {}
455#endif /* CONFIG_ACPI_SLEEP */
456
457#ifdef CONFIG_SUSPEND
458static u32 acpi_suspend_states[] = {
459 [PM_SUSPEND_ON] = ACPI_STATE_S0,
460 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
461 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
462 [PM_SUSPEND_MAX] = ACPI_STATE_S5
463};
464
465/**
466 * acpi_suspend_begin - Set the target system sleep state to the state
467 * associated with given @pm_state, if supported.
468 */
469static int acpi_suspend_begin(suspend_state_t pm_state)
470{
471 u32 acpi_state = acpi_suspend_states[pm_state];
472 int error;
473
474 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
475 if (error)
476 return error;
477
478 if (!sleep_states[acpi_state]) {
479 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
480 return -ENOSYS;
481 }
482
483 acpi_pm_start(acpi_state);
484 return 0;
485}
486
487/**
488 * acpi_suspend_enter - Actually enter a sleep state.
489 * @pm_state: ignored
490 *
491 * Flush caches and go to sleep. For STR we have to call arch-specific
492 * assembly, which in turn call acpi_enter_sleep_state().
493 * It's unfortunate, but it works. Please fix if you're feeling frisky.
494 */
495static int acpi_suspend_enter(suspend_state_t pm_state)
496{
497 acpi_status status = AE_OK;
498 u32 acpi_state = acpi_target_sleep_state;
499 int error;
500
501 ACPI_FLUSH_CPU_CACHE();
502
503 switch (acpi_state) {
504 case ACPI_STATE_S1:
505 barrier();
506 status = acpi_enter_sleep_state(acpi_state);
507 break;
508
509 case ACPI_STATE_S3:
510 if (!acpi_suspend_lowlevel)
511 return -ENOSYS;
512 error = acpi_suspend_lowlevel();
513 if (error)
514 return error;
515 pr_info(PREFIX "Low-level resume complete\n");
516 break;
517 }
518
519 /* This violates the spec but is required for bug compatibility. */
520 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
521
522 /* Reprogram control registers */
523 acpi_leave_sleep_state_prep(acpi_state);
524
525 /* ACPI 3.0 specs (P62) says that it's the responsibility
526 * of the OSPM to clear the status bit [ implying that the
527 * POWER_BUTTON event should not reach userspace ]
528 *
529 * However, we do generate a small hint for userspace in the form of
530 * a wakeup event. We flag this condition for now and generate the
531 * event later, as we're currently too early in resume to be able to
532 * generate wakeup events.
533 */
534 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
535 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
536
537 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
538
539 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
540 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
541 /* Flag for later */
542 pwr_btn_event_pending = true;
543 }
544 }
545
546 /*
547 * Disable and clear GPE status before interrupt is enabled. Some GPEs
548 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
549 * acpi_leave_sleep_state will reenable specific GPEs later
550 */
551 acpi_disable_all_gpes();
552 /* Allow EC transactions to happen. */
553 acpi_ec_unblock_transactions_early();
554
555 suspend_nvs_restore();
556
557 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
558}
559
560static int acpi_suspend_state_valid(suspend_state_t pm_state)
561{
562 u32 acpi_state;
563
564 switch (pm_state) {
565 case PM_SUSPEND_ON:
566 case PM_SUSPEND_STANDBY:
567 case PM_SUSPEND_MEM:
568 acpi_state = acpi_suspend_states[pm_state];
569
570 return sleep_states[acpi_state];
571 default:
572 return 0;
573 }
574}
575
576static const struct platform_suspend_ops acpi_suspend_ops = {
577 .valid = acpi_suspend_state_valid,
578 .begin = acpi_suspend_begin,
579 .prepare_late = acpi_pm_prepare,
580 .enter = acpi_suspend_enter,
581 .wake = acpi_pm_finish,
582 .end = acpi_pm_end,
583};
584
585/**
586 * acpi_suspend_begin_old - Set the target system sleep state to the
587 * state associated with given @pm_state, if supported, and
588 * execute the _PTS control method. This function is used if the
589 * pre-ACPI 2.0 suspend ordering has been requested.
590 */
591static int acpi_suspend_begin_old(suspend_state_t pm_state)
592{
593 int error = acpi_suspend_begin(pm_state);
594 if (!error)
595 error = __acpi_pm_prepare();
596
597 return error;
598}
599
600/*
601 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
602 * been requested.
603 */
604static const struct platform_suspend_ops acpi_suspend_ops_old = {
605 .valid = acpi_suspend_state_valid,
606 .begin = acpi_suspend_begin_old,
607 .prepare_late = acpi_pm_pre_suspend,
608 .enter = acpi_suspend_enter,
609 .wake = acpi_pm_finish,
610 .end = acpi_pm_end,
611 .recover = acpi_pm_finish,
612};
613
614static void acpi_sleep_suspend_setup(void)
615{
616 int i;
617
618 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
619 if (acpi_sleep_state_supported(i))
620 sleep_states[i] = 1;
621
622 suspend_set_ops(old_suspend_ordering ?
623 &acpi_suspend_ops_old : &acpi_suspend_ops);
624}
625#else /* !CONFIG_SUSPEND */
626static inline void acpi_sleep_suspend_setup(void) {}
627#endif /* !CONFIG_SUSPEND */
628
629#ifdef CONFIG_HIBERNATION
630static unsigned long s4_hardware_signature;
631static struct acpi_table_facs *facs;
632static bool nosigcheck;
633
634void __init acpi_no_s4_hw_signature(void)
635{
636 nosigcheck = true;
637}
638
639static int acpi_hibernation_begin(void)
640{
641 int error;
642
643 error = nvs_nosave ? 0 : suspend_nvs_alloc();
644 if (!error)
645 acpi_pm_start(ACPI_STATE_S4);
646
647 return error;
648}
649
650static int acpi_hibernation_enter(void)
651{
652 acpi_status status = AE_OK;
653
654 ACPI_FLUSH_CPU_CACHE();
655
656 /* This shouldn't return. If it returns, we have a problem */
657 status = acpi_enter_sleep_state(ACPI_STATE_S4);
658 /* Reprogram control registers */
659 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
660
661 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
662}
663
664static void acpi_hibernation_leave(void)
665{
666 /*
667 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
668 * enable it here.
669 */
670 acpi_enable();
671 /* Reprogram control registers */
672 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
673 /* Check the hardware signature */
674 if (facs && s4_hardware_signature != facs->hardware_signature)
675 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
676 /* Restore the NVS memory area */
677 suspend_nvs_restore();
678 /* Allow EC transactions to happen. */
679 acpi_ec_unblock_transactions_early();
680}
681
682static void acpi_pm_thaw(void)
683{
684 acpi_ec_unblock_transactions();
685 acpi_enable_all_runtime_gpes();
686}
687
688static const struct platform_hibernation_ops acpi_hibernation_ops = {
689 .begin = acpi_hibernation_begin,
690 .end = acpi_pm_end,
691 .pre_snapshot = acpi_pm_prepare,
692 .finish = acpi_pm_finish,
693 .prepare = acpi_pm_prepare,
694 .enter = acpi_hibernation_enter,
695 .leave = acpi_hibernation_leave,
696 .pre_restore = acpi_pm_freeze,
697 .restore_cleanup = acpi_pm_thaw,
698};
699
700/**
701 * acpi_hibernation_begin_old - Set the target system sleep state to
702 * ACPI_STATE_S4 and execute the _PTS control method. This
703 * function is used if the pre-ACPI 2.0 suspend ordering has been
704 * requested.
705 */
706static int acpi_hibernation_begin_old(void)
707{
708 int error;
709 /*
710 * The _TTS object should always be evaluated before the _PTS object.
711 * When the old_suspended_ordering is true, the _PTS object is
712 * evaluated in the acpi_sleep_prepare.
713 */
714 acpi_sleep_tts_switch(ACPI_STATE_S4);
715
716 error = acpi_sleep_prepare(ACPI_STATE_S4);
717
718 if (!error) {
719 if (!nvs_nosave)
720 error = suspend_nvs_alloc();
721 if (!error) {
722 acpi_target_sleep_state = ACPI_STATE_S4;
723 acpi_scan_lock_acquire();
724 }
725 }
726 return error;
727}
728
729/*
730 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
731 * been requested.
732 */
733static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
734 .begin = acpi_hibernation_begin_old,
735 .end = acpi_pm_end,
736 .pre_snapshot = acpi_pm_pre_suspend,
737 .prepare = acpi_pm_freeze,
738 .finish = acpi_pm_finish,
739 .enter = acpi_hibernation_enter,
740 .leave = acpi_hibernation_leave,
741 .pre_restore = acpi_pm_freeze,
742 .restore_cleanup = acpi_pm_thaw,
743 .recover = acpi_pm_finish,
744};
745
746static void acpi_sleep_hibernate_setup(void)
747{
748 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
749 return;
750
751 hibernation_set_ops(old_suspend_ordering ?
752 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
753 sleep_states[ACPI_STATE_S4] = 1;
754 if (nosigcheck)
755 return;
756
757 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
758 if (facs)
759 s4_hardware_signature = facs->hardware_signature;
760}
761#else /* !CONFIG_HIBERNATION */
762static inline void acpi_sleep_hibernate_setup(void) {}
763#endif /* !CONFIG_HIBERNATION */
764
765int acpi_suspend(u32 acpi_state)
766{
767 suspend_state_t states[] = {
768 [1] = PM_SUSPEND_STANDBY,
769 [3] = PM_SUSPEND_MEM,
770 [5] = PM_SUSPEND_MAX
771 };
772
773 if (acpi_state < 6 && states[acpi_state])
774 return pm_suspend(states[acpi_state]);
775 if (acpi_state == 4)
776 return hibernate();
777 return -EINVAL;
778}
779
780static void acpi_power_off_prepare(void)
781{
782 /* Prepare to power off the system */
783 acpi_sleep_prepare(ACPI_STATE_S5);
784 acpi_disable_all_gpes();
785}
786
787static void acpi_power_off(void)
788{
789 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
790 printk(KERN_DEBUG "%s called\n", __func__);
791 local_irq_disable();
792 acpi_enter_sleep_state(ACPI_STATE_S5);
793}
794
795int __init acpi_sleep_init(void)
796{
797 char supported[ACPI_S_STATE_COUNT * 3 + 1];
798 char *pos = supported;
799 int i;
800
801 acpi_sleep_dmi_check();
802
803 sleep_states[ACPI_STATE_S0] = 1;
804
805 acpi_sleep_suspend_setup();
806 acpi_sleep_hibernate_setup();
807
808 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
809 sleep_states[ACPI_STATE_S5] = 1;
810 pm_power_off_prepare = acpi_power_off_prepare;
811 pm_power_off = acpi_power_off;
812 }
813
814 supported[0] = 0;
815 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
816 if (sleep_states[i])
817 pos += sprintf(pos, " S%d", i);
818 }
819 pr_info(PREFIX "(supports%s)\n", supported);
820
821 /*
822 * Register the tts_notifier to reboot notifier list so that the _TTS
823 * object can also be evaluated when the system enters S5.
824 */
825 register_reboot_notifier(&tts_notifier);
826 return 0;
827}