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authorLen Brown <len.brown@intel.com>2009-01-16 13:52:03 -0500
committerLen Brown <len.brown@intel.com>2009-01-16 14:32:19 -0500
commitd08ca2ca743f324eceba59e93188f9439e966bce (patch)
tree97dc57cc690fceb637ab0642a11ec648e4620ff8 /drivers/acpi/sleep.c
parentcad73120ab0dfd484682229346de8c16073577e1 (diff)
ACPI: rename main.c to sleep.c
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/sleep.c')
-rw-r--r--drivers/acpi/sleep.c747
1 files changed, 747 insertions, 0 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
new file mode 100644
index 000000000000..7e3c609cbef2
--- /dev/null
+++ b/drivers/acpi/sleep.c
@@ -0,0 +1,747 @@
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
20#include <asm/io.h>
21
22#include <acpi/acpi_bus.h>
23#include <acpi/acpi_drivers.h>
24#include "sleep.h"
25
26u8 sleep_states[ACPI_S_STATE_COUNT];
27
28static void acpi_sleep_tts_switch(u32 acpi_state)
29{
30 union acpi_object in_arg = { ACPI_TYPE_INTEGER };
31 struct acpi_object_list arg_list = { 1, &in_arg };
32 acpi_status status = AE_OK;
33
34 in_arg.integer.value = acpi_state;
35 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
36 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
37 /*
38 * OS can't evaluate the _TTS object correctly. Some warning
39 * message will be printed. But it won't break anything.
40 */
41 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
42 }
43}
44
45static int tts_notify_reboot(struct notifier_block *this,
46 unsigned long code, void *x)
47{
48 acpi_sleep_tts_switch(ACPI_STATE_S5);
49 return NOTIFY_DONE;
50}
51
52static struct notifier_block tts_notifier = {
53 .notifier_call = tts_notify_reboot,
54 .next = NULL,
55 .priority = 0,
56};
57
58static int acpi_sleep_prepare(u32 acpi_state)
59{
60#ifdef CONFIG_ACPI_SLEEP
61 /* do we have a wakeup address for S2 and S3? */
62 if (acpi_state == ACPI_STATE_S3) {
63 if (!acpi_wakeup_address) {
64 return -EFAULT;
65 }
66 acpi_set_firmware_waking_vector(
67 (acpi_physical_address)acpi_wakeup_address);
68
69 }
70 ACPI_FLUSH_CPU_CACHE();
71 acpi_enable_wakeup_device_prep(acpi_state);
72#endif
73 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
74 acpi_state);
75 acpi_enter_sleep_state_prep(acpi_state);
76 return 0;
77}
78
79#ifdef CONFIG_ACPI_SLEEP
80static u32 acpi_target_sleep_state = ACPI_STATE_S0;
81/*
82 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
83 * user to request that behavior by using the 'acpi_old_suspend_ordering'
84 * kernel command line option that causes the following variable to be set.
85 */
86static bool old_suspend_ordering;
87
88void __init acpi_old_suspend_ordering(void)
89{
90 old_suspend_ordering = true;
91}
92
93/*
94 * According to the ACPI specification the BIOS should make sure that ACPI is
95 * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still,
96 * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
97 * on such systems during resume. Unfortunately that doesn't help in
98 * particularly pathological cases in which SCI_EN has to be set directly on
99 * resume, although the specification states very clearly that this flag is
100 * owned by the hardware. The set_sci_en_on_resume variable will be set in such
101 * cases.
102 */
103static bool set_sci_en_on_resume;
104/*
105 * The ACPI specification wants us to save NVS memory regions during hibernation
106 * and to restore them during the subsequent resume. However, it is not certain
107 * if this mechanism is going to work on all machines, so we allow the user to
108 * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
109 * option.
110 */
111static bool s4_no_nvs;
112
113void __init acpi_s4_no_nvs(void)
114{
115 s4_no_nvs = true;
116}
117
118/**
119 * acpi_pm_disable_gpes - Disable the GPEs.
120 */
121static int acpi_pm_disable_gpes(void)
122{
123 acpi_disable_all_gpes();
124 return 0;
125}
126
127/**
128 * __acpi_pm_prepare - Prepare the platform to enter the target state.
129 *
130 * If necessary, set the firmware waking vector and do arch-specific
131 * nastiness to get the wakeup code to the waking vector.
132 */
133static int __acpi_pm_prepare(void)
134{
135 int error = acpi_sleep_prepare(acpi_target_sleep_state);
136
137 if (error)
138 acpi_target_sleep_state = ACPI_STATE_S0;
139 return error;
140}
141
142/**
143 * acpi_pm_prepare - Prepare the platform to enter the target sleep
144 * state and disable the GPEs.
145 */
146static int acpi_pm_prepare(void)
147{
148 int error = __acpi_pm_prepare();
149
150 if (!error)
151 acpi_disable_all_gpes();
152 return error;
153}
154
155/**
156 * acpi_pm_finish - Instruct the platform to leave a sleep state.
157 *
158 * This is called after we wake back up (or if entering the sleep state
159 * failed).
160 */
161static void acpi_pm_finish(void)
162{
163 u32 acpi_state = acpi_target_sleep_state;
164
165 if (acpi_state == ACPI_STATE_S0)
166 return;
167
168 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
169 acpi_state);
170 acpi_disable_wakeup_device(acpi_state);
171 acpi_leave_sleep_state(acpi_state);
172
173 /* reset firmware waking vector */
174 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
175
176 acpi_target_sleep_state = ACPI_STATE_S0;
177}
178
179/**
180 * acpi_pm_end - Finish up suspend sequence.
181 */
182static void acpi_pm_end(void)
183{
184 /*
185 * This is necessary in case acpi_pm_finish() is not called during a
186 * failing transition to a sleep state.
187 */
188 acpi_target_sleep_state = ACPI_STATE_S0;
189 acpi_sleep_tts_switch(acpi_target_sleep_state);
190}
191#else /* !CONFIG_ACPI_SLEEP */
192#define acpi_target_sleep_state ACPI_STATE_S0
193#endif /* CONFIG_ACPI_SLEEP */
194
195#ifdef CONFIG_SUSPEND
196extern void do_suspend_lowlevel(void);
197
198static u32 acpi_suspend_states[] = {
199 [PM_SUSPEND_ON] = ACPI_STATE_S0,
200 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
201 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
202 [PM_SUSPEND_MAX] = ACPI_STATE_S5
203};
204
205/**
206 * acpi_suspend_begin - Set the target system sleep state to the state
207 * associated with given @pm_state, if supported.
208 */
209static int acpi_suspend_begin(suspend_state_t pm_state)
210{
211 u32 acpi_state = acpi_suspend_states[pm_state];
212 int error = 0;
213
214 if (sleep_states[acpi_state]) {
215 acpi_target_sleep_state = acpi_state;
216 acpi_sleep_tts_switch(acpi_target_sleep_state);
217 } else {
218 printk(KERN_ERR "ACPI does not support this state: %d\n",
219 pm_state);
220 error = -ENOSYS;
221 }
222 return error;
223}
224
225/**
226 * acpi_suspend_enter - Actually enter a sleep state.
227 * @pm_state: ignored
228 *
229 * Flush caches and go to sleep. For STR we have to call arch-specific
230 * assembly, which in turn call acpi_enter_sleep_state().
231 * It's unfortunate, but it works. Please fix if you're feeling frisky.
232 */
233static int acpi_suspend_enter(suspend_state_t pm_state)
234{
235 acpi_status status = AE_OK;
236 unsigned long flags = 0;
237 u32 acpi_state = acpi_target_sleep_state;
238
239 ACPI_FLUSH_CPU_CACHE();
240
241 /* Do arch specific saving of state. */
242 if (acpi_state == ACPI_STATE_S3) {
243 int error = acpi_save_state_mem();
244
245 if (error)
246 return error;
247 }
248
249 local_irq_save(flags);
250 acpi_enable_wakeup_device(acpi_state);
251 switch (acpi_state) {
252 case ACPI_STATE_S1:
253 barrier();
254 status = acpi_enter_sleep_state(acpi_state);
255 break;
256
257 case ACPI_STATE_S3:
258 do_suspend_lowlevel();
259 break;
260 }
261
262 /* If ACPI is not enabled by the BIOS, we need to enable it here. */
263 if (set_sci_en_on_resume)
264 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
265 else
266 acpi_enable();
267
268 /* Reprogram control registers and execute _BFS */
269 acpi_leave_sleep_state_prep(acpi_state);
270
271 /* ACPI 3.0 specs (P62) says that it's the responsibility
272 * of the OSPM to clear the status bit [ implying that the
273 * POWER_BUTTON event should not reach userspace ]
274 */
275 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
276 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
277
278 /*
279 * Disable and clear GPE status before interrupt is enabled. Some GPEs
280 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
281 * acpi_leave_sleep_state will reenable specific GPEs later
282 */
283 acpi_disable_all_gpes();
284
285 local_irq_restore(flags);
286 printk(KERN_DEBUG "Back to C!\n");
287
288 /* restore processor state */
289 if (acpi_state == ACPI_STATE_S3)
290 acpi_restore_state_mem();
291
292 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
293}
294
295static int acpi_suspend_state_valid(suspend_state_t pm_state)
296{
297 u32 acpi_state;
298
299 switch (pm_state) {
300 case PM_SUSPEND_ON:
301 case PM_SUSPEND_STANDBY:
302 case PM_SUSPEND_MEM:
303 acpi_state = acpi_suspend_states[pm_state];
304
305 return sleep_states[acpi_state];
306 default:
307 return 0;
308 }
309}
310
311static struct platform_suspend_ops acpi_suspend_ops = {
312 .valid = acpi_suspend_state_valid,
313 .begin = acpi_suspend_begin,
314 .prepare = acpi_pm_prepare,
315 .enter = acpi_suspend_enter,
316 .finish = acpi_pm_finish,
317 .end = acpi_pm_end,
318};
319
320/**
321 * acpi_suspend_begin_old - Set the target system sleep state to the
322 * state associated with given @pm_state, if supported, and
323 * execute the _PTS control method. This function is used if the
324 * pre-ACPI 2.0 suspend ordering has been requested.
325 */
326static int acpi_suspend_begin_old(suspend_state_t pm_state)
327{
328 int error = acpi_suspend_begin(pm_state);
329
330 if (!error)
331 error = __acpi_pm_prepare();
332 return error;
333}
334
335/*
336 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
337 * been requested.
338 */
339static struct platform_suspend_ops acpi_suspend_ops_old = {
340 .valid = acpi_suspend_state_valid,
341 .begin = acpi_suspend_begin_old,
342 .prepare = acpi_pm_disable_gpes,
343 .enter = acpi_suspend_enter,
344 .finish = acpi_pm_finish,
345 .end = acpi_pm_end,
346 .recover = acpi_pm_finish,
347};
348
349static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
350{
351 old_suspend_ordering = true;
352 return 0;
353}
354
355static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
356{
357 set_sci_en_on_resume = true;
358 return 0;
359}
360
361static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
362 {
363 .callback = init_old_suspend_ordering,
364 .ident = "Abit KN9 (nForce4 variant)",
365 .matches = {
366 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
367 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
368 },
369 },
370 {
371 .callback = init_old_suspend_ordering,
372 .ident = "HP xw4600 Workstation",
373 .matches = {
374 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
375 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
376 },
377 },
378 {
379 .callback = init_set_sci_en_on_resume,
380 .ident = "Apple MacBook 1,1",
381 .matches = {
382 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
383 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
384 },
385 },
386 {
387 .callback = init_set_sci_en_on_resume,
388 .ident = "Apple MacMini 1,1",
389 .matches = {
390 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
391 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
392 },
393 },
394 {},
395};
396#endif /* CONFIG_SUSPEND */
397
398#ifdef CONFIG_HIBERNATION
399static unsigned long s4_hardware_signature;
400static struct acpi_table_facs *facs;
401static bool nosigcheck;
402
403void __init acpi_no_s4_hw_signature(void)
404{
405 nosigcheck = true;
406}
407
408static int acpi_hibernation_begin(void)
409{
410 int error;
411
412 error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
413 if (!error) {
414 acpi_target_sleep_state = ACPI_STATE_S4;
415 acpi_sleep_tts_switch(acpi_target_sleep_state);
416 }
417
418 return error;
419}
420
421static int acpi_hibernation_pre_snapshot(void)
422{
423 int error = acpi_pm_prepare();
424
425 if (!error)
426 hibernate_nvs_save();
427
428 return error;
429}
430
431static int acpi_hibernation_enter(void)
432{
433 acpi_status status = AE_OK;
434 unsigned long flags = 0;
435
436 ACPI_FLUSH_CPU_CACHE();
437
438 local_irq_save(flags);
439 acpi_enable_wakeup_device(ACPI_STATE_S4);
440 /* This shouldn't return. If it returns, we have a problem */
441 status = acpi_enter_sleep_state(ACPI_STATE_S4);
442 /* Reprogram control registers and execute _BFS */
443 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
444 local_irq_restore(flags);
445
446 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
447}
448
449static void acpi_hibernation_finish(void)
450{
451 hibernate_nvs_free();
452 acpi_pm_finish();
453}
454
455static void acpi_hibernation_leave(void)
456{
457 /*
458 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
459 * enable it here.
460 */
461 acpi_enable();
462 /* Reprogram control registers and execute _BFS */
463 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
464 /* Check the hardware signature */
465 if (facs && s4_hardware_signature != facs->hardware_signature) {
466 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
467 "cannot resume!\n");
468 panic("ACPI S4 hardware signature mismatch");
469 }
470 /* Restore the NVS memory area */
471 hibernate_nvs_restore();
472}
473
474static void acpi_pm_enable_gpes(void)
475{
476 acpi_enable_all_runtime_gpes();
477}
478
479static struct platform_hibernation_ops acpi_hibernation_ops = {
480 .begin = acpi_hibernation_begin,
481 .end = acpi_pm_end,
482 .pre_snapshot = acpi_hibernation_pre_snapshot,
483 .finish = acpi_hibernation_finish,
484 .prepare = acpi_pm_prepare,
485 .enter = acpi_hibernation_enter,
486 .leave = acpi_hibernation_leave,
487 .pre_restore = acpi_pm_disable_gpes,
488 .restore_cleanup = acpi_pm_enable_gpes,
489};
490
491/**
492 * acpi_hibernation_begin_old - Set the target system sleep state to
493 * ACPI_STATE_S4 and execute the _PTS control method. This
494 * function is used if the pre-ACPI 2.0 suspend ordering has been
495 * requested.
496 */
497static int acpi_hibernation_begin_old(void)
498{
499 int error;
500 /*
501 * The _TTS object should always be evaluated before the _PTS object.
502 * When the old_suspended_ordering is true, the _PTS object is
503 * evaluated in the acpi_sleep_prepare.
504 */
505 acpi_sleep_tts_switch(ACPI_STATE_S4);
506
507 error = acpi_sleep_prepare(ACPI_STATE_S4);
508
509 if (!error) {
510 if (!s4_no_nvs)
511 error = hibernate_nvs_alloc();
512 if (!error)
513 acpi_target_sleep_state = ACPI_STATE_S4;
514 }
515 return error;
516}
517
518static int acpi_hibernation_pre_snapshot_old(void)
519{
520 int error = acpi_pm_disable_gpes();
521
522 if (!error)
523 hibernate_nvs_save();
524
525 return error;
526}
527
528/*
529 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
530 * been requested.
531 */
532static struct platform_hibernation_ops acpi_hibernation_ops_old = {
533 .begin = acpi_hibernation_begin_old,
534 .end = acpi_pm_end,
535 .pre_snapshot = acpi_hibernation_pre_snapshot_old,
536 .finish = acpi_hibernation_finish,
537 .prepare = acpi_pm_disable_gpes,
538 .enter = acpi_hibernation_enter,
539 .leave = acpi_hibernation_leave,
540 .pre_restore = acpi_pm_disable_gpes,
541 .restore_cleanup = acpi_pm_enable_gpes,
542 .recover = acpi_pm_finish,
543};
544#endif /* CONFIG_HIBERNATION */
545
546int acpi_suspend(u32 acpi_state)
547{
548 suspend_state_t states[] = {
549 [1] = PM_SUSPEND_STANDBY,
550 [3] = PM_SUSPEND_MEM,
551 [5] = PM_SUSPEND_MAX
552 };
553
554 if (acpi_state < 6 && states[acpi_state])
555 return pm_suspend(states[acpi_state]);
556 if (acpi_state == 4)
557 return hibernate();
558 return -EINVAL;
559}
560
561#ifdef CONFIG_PM_SLEEP
562/**
563 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
564 * in the system sleep state given by %acpi_target_sleep_state
565 * @dev: device to examine; its driver model wakeup flags control
566 * whether it should be able to wake up the system
567 * @d_min_p: used to store the upper limit of allowed states range
568 * Return value: preferred power state of the device on success, -ENODEV on
569 * failure (ie. if there's no 'struct acpi_device' for @dev)
570 *
571 * Find the lowest power (highest number) ACPI device power state that
572 * device @dev can be in while the system is in the sleep state represented
573 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
574 * able to wake up the system from this sleep state. If @d_min_p is set,
575 * the highest power (lowest number) device power state of @dev allowed
576 * in this system sleep state is stored at the location pointed to by it.
577 *
578 * The caller must ensure that @dev is valid before using this function.
579 * The caller is also responsible for figuring out if the device is
580 * supposed to be able to wake up the system and passing this information
581 * via @wake.
582 */
583
584int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
585{
586 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
587 struct acpi_device *adev;
588 char acpi_method[] = "_SxD";
589 unsigned long long d_min, d_max;
590
591 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
592 printk(KERN_DEBUG "ACPI handle has no context!\n");
593 return -ENODEV;
594 }
595
596 acpi_method[2] = '0' + acpi_target_sleep_state;
597 /*
598 * If the sleep state is S0, we will return D3, but if the device has
599 * _S0W, we will use the value from _S0W
600 */
601 d_min = ACPI_STATE_D0;
602 d_max = ACPI_STATE_D3;
603
604 /*
605 * If present, _SxD methods return the minimum D-state (highest power
606 * state) we can use for the corresponding S-states. Otherwise, the
607 * minimum D-state is D0 (ACPI 3.x).
608 *
609 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
610 * provided -- that's our fault recovery, we ignore retval.
611 */
612 if (acpi_target_sleep_state > ACPI_STATE_S0)
613 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
614
615 /*
616 * If _PRW says we can wake up the system from the target sleep state,
617 * the D-state returned by _SxD is sufficient for that (we assume a
618 * wakeup-aware driver if wake is set). Still, if _SxW exists
619 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
620 * can wake the system. _S0W may be valid, too.
621 */
622 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
623 (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
624 adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
625 acpi_status status;
626
627 acpi_method[3] = 'W';
628 status = acpi_evaluate_integer(handle, acpi_method, NULL,
629 &d_max);
630 if (ACPI_FAILURE(status)) {
631 d_max = d_min;
632 } else if (d_max < d_min) {
633 /* Warn the user of the broken DSDT */
634 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
635 acpi_method);
636 /* Sanitize it */
637 d_min = d_max;
638 }
639 }
640
641 if (d_min_p)
642 *d_min_p = d_min;
643 return d_max;
644}
645
646/**
647 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
648 * capability of given device
649 * @dev: device to handle
650 * @enable: 'true' - enable, 'false' - disable the wake-up capability
651 */
652int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
653{
654 acpi_handle handle;
655 struct acpi_device *adev;
656
657 if (!device_may_wakeup(dev))
658 return -EINVAL;
659
660 handle = DEVICE_ACPI_HANDLE(dev);
661 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
662 printk(KERN_DEBUG "ACPI handle has no context!\n");
663 return -ENODEV;
664 }
665
666 return enable ?
667 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
668 acpi_disable_wakeup_device_power(adev);
669}
670#endif
671
672static void acpi_power_off_prepare(void)
673{
674 /* Prepare to power off the system */
675 acpi_sleep_prepare(ACPI_STATE_S5);
676 acpi_disable_all_gpes();
677}
678
679static void acpi_power_off(void)
680{
681 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
682 printk("%s called\n", __func__);
683 local_irq_disable();
684 acpi_enable_wakeup_device(ACPI_STATE_S5);
685 acpi_enter_sleep_state(ACPI_STATE_S5);
686}
687
688int __init acpi_sleep_init(void)
689{
690 acpi_status status;
691 u8 type_a, type_b;
692#ifdef CONFIG_SUSPEND
693 int i = 0;
694
695 dmi_check_system(acpisleep_dmi_table);
696#endif
697
698 if (acpi_disabled)
699 return 0;
700
701 sleep_states[ACPI_STATE_S0] = 1;
702 printk(KERN_INFO PREFIX "(supports S0");
703
704#ifdef CONFIG_SUSPEND
705 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
706 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
707 if (ACPI_SUCCESS(status)) {
708 sleep_states[i] = 1;
709 printk(" S%d", i);
710 }
711 }
712
713 suspend_set_ops(old_suspend_ordering ?
714 &acpi_suspend_ops_old : &acpi_suspend_ops);
715#endif
716
717#ifdef CONFIG_HIBERNATION
718 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
719 if (ACPI_SUCCESS(status)) {
720 hibernation_set_ops(old_suspend_ordering ?
721 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
722 sleep_states[ACPI_STATE_S4] = 1;
723 printk(" S4");
724 if (!nosigcheck) {
725 acpi_get_table(ACPI_SIG_FACS, 1,
726 (struct acpi_table_header **)&facs);
727 if (facs)
728 s4_hardware_signature =
729 facs->hardware_signature;
730 }
731 }
732#endif
733 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
734 if (ACPI_SUCCESS(status)) {
735 sleep_states[ACPI_STATE_S5] = 1;
736 printk(" S5");
737 pm_power_off_prepare = acpi_power_off_prepare;
738 pm_power_off = acpi_power_off;
739 }
740 printk(")\n");
741 /*
742 * Register the tts_notifier to reboot notifier list so that the _TTS
743 * object can also be evaluated when the system enters S5.
744 */
745 register_reboot_notifier(&tts_notifier);
746 return 0;
747}