Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus
[linux-btrfs-devel.git] / drivers / acpi / sleep.c
blob3ed80b2ca9078b18951d69cd00928f3dbcc53fbd
1 /*
2 * sleep.c - ACPI sleep support.
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
9 * This file is released under the GPLv2.
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>
21 #include <asm/io.h>
23 #include <acpi/acpi_bus.h>
24 #include <acpi/acpi_drivers.h>
26 #include "internal.h"
27 #include "sleep.h"
29 static u8 sleep_states[ACPI_S_STATE_COUNT];
31 static void acpi_sleep_tts_switch(u32 acpi_state)
33 union acpi_object in_arg = { ACPI_TYPE_INTEGER };
34 struct acpi_object_list arg_list = { 1, &in_arg };
35 acpi_status status = AE_OK;
37 in_arg.integer.value = acpi_state;
38 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
39 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
41 * OS can't evaluate the _TTS object correctly. Some warning
42 * message will be printed. But it won't break anything.
44 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
48 static int tts_notify_reboot(struct notifier_block *this,
49 unsigned long code, void *x)
51 acpi_sleep_tts_switch(ACPI_STATE_S5);
52 return NOTIFY_DONE;
55 static struct notifier_block tts_notifier = {
56 .notifier_call = tts_notify_reboot,
57 .next = NULL,
58 .priority = 0,
61 static int acpi_sleep_prepare(u32 acpi_state)
63 #ifdef CONFIG_ACPI_SLEEP
64 /* do we have a wakeup address for S2 and S3? */
65 if (acpi_state == ACPI_STATE_S3) {
66 if (!acpi_wakeup_address) {
67 return -EFAULT;
69 acpi_set_firmware_waking_vector(
70 (acpi_physical_address)acpi_wakeup_address);
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;
82 #ifdef CONFIG_ACPI_SLEEP
83 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
86 * The ACPI specification wants us to save NVS memory regions during hibernation
87 * and to restore them during the subsequent resume. Windows does that also for
88 * suspend to RAM. However, it is known that this mechanism does not work on
89 * all machines, so we allow the user to disable it with the help of the
90 * 'acpi_sleep=nonvs' kernel command line option.
92 static bool nvs_nosave;
94 void __init acpi_nvs_nosave(void)
96 nvs_nosave = true;
100 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
101 * user to request that behavior by using the 'acpi_old_suspend_ordering'
102 * kernel command line option that causes the following variable to be set.
104 static bool old_suspend_ordering;
106 void __init acpi_old_suspend_ordering(void)
108 old_suspend_ordering = true;
112 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
114 static int acpi_pm_freeze(void)
116 acpi_disable_all_gpes();
117 acpi_os_wait_events_complete(NULL);
118 acpi_ec_block_transactions();
119 return 0;
123 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
125 static int acpi_pm_pre_suspend(void)
127 acpi_pm_freeze();
128 return suspend_nvs_save();
132 * __acpi_pm_prepare - Prepare the platform to enter the target state.
134 * If necessary, set the firmware waking vector and do arch-specific
135 * nastiness to get the wakeup code to the waking vector.
137 static int __acpi_pm_prepare(void)
139 int error = acpi_sleep_prepare(acpi_target_sleep_state);
140 if (error)
141 acpi_target_sleep_state = ACPI_STATE_S0;
143 return error;
147 * acpi_pm_prepare - Prepare the platform to enter the target sleep
148 * state and disable the GPEs.
150 static int acpi_pm_prepare(void)
152 int error = __acpi_pm_prepare();
153 if (!error)
154 error = acpi_pm_pre_suspend();
156 return error;
160 * acpi_pm_finish - Instruct the platform to leave a sleep state.
162 * This is called after we wake back up (or if entering the sleep state
163 * failed).
165 static void acpi_pm_finish(void)
167 u32 acpi_state = acpi_target_sleep_state;
169 acpi_ec_unblock_transactions();
170 suspend_nvs_free();
172 if (acpi_state == ACPI_STATE_S0)
173 return;
175 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
176 acpi_state);
177 acpi_disable_wakeup_devices(acpi_state);
178 acpi_leave_sleep_state(acpi_state);
180 /* reset firmware waking vector */
181 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
183 acpi_target_sleep_state = ACPI_STATE_S0;
187 * acpi_pm_end - Finish up suspend sequence.
189 static void acpi_pm_end(void)
192 * This is necessary in case acpi_pm_finish() is not called during a
193 * failing transition to a sleep state.
195 acpi_target_sleep_state = ACPI_STATE_S0;
196 acpi_sleep_tts_switch(acpi_target_sleep_state);
198 #else /* !CONFIG_ACPI_SLEEP */
199 #define acpi_target_sleep_state ACPI_STATE_S0
200 #endif /* CONFIG_ACPI_SLEEP */
202 #ifdef CONFIG_SUSPEND
203 static u32 acpi_suspend_states[] = {
204 [PM_SUSPEND_ON] = ACPI_STATE_S0,
205 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
206 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
207 [PM_SUSPEND_MAX] = ACPI_STATE_S5
211 * acpi_suspend_begin - Set the target system sleep state to the state
212 * associated with given @pm_state, if supported.
214 static int acpi_suspend_begin(suspend_state_t pm_state)
216 u32 acpi_state = acpi_suspend_states[pm_state];
217 int error = 0;
219 error = nvs_nosave ? 0 : suspend_nvs_alloc();
220 if (error)
221 return error;
223 if (sleep_states[acpi_state]) {
224 acpi_target_sleep_state = acpi_state;
225 acpi_sleep_tts_switch(acpi_target_sleep_state);
226 } else {
227 printk(KERN_ERR "ACPI does not support this state: %d\n",
228 pm_state);
229 error = -ENOSYS;
231 return error;
235 * acpi_suspend_enter - Actually enter a sleep state.
236 * @pm_state: ignored
238 * Flush caches and go to sleep. For STR we have to call arch-specific
239 * assembly, which in turn call acpi_enter_sleep_state().
240 * It's unfortunate, but it works. Please fix if you're feeling frisky.
242 static int acpi_suspend_enter(suspend_state_t pm_state)
244 acpi_status status = AE_OK;
245 u32 acpi_state = acpi_target_sleep_state;
246 int error;
248 ACPI_FLUSH_CPU_CACHE();
250 switch (acpi_state) {
251 case ACPI_STATE_S1:
252 barrier();
253 status = acpi_enter_sleep_state(acpi_state);
254 break;
256 case ACPI_STATE_S3:
257 error = acpi_suspend_lowlevel();
258 if (error)
259 return error;
260 pr_info(PREFIX "Low-level resume complete\n");
261 break;
264 /* This violates the spec but is required for bug compatibility. */
265 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
267 /* Reprogram control registers and execute _BFS */
268 acpi_leave_sleep_state_prep(acpi_state);
270 /* ACPI 3.0 specs (P62) says that it's the responsibility
271 * of the OSPM to clear the status bit [ implying that the
272 * POWER_BUTTON event should not reach userspace ]
274 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
275 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
278 * Disable and clear GPE status before interrupt is enabled. Some GPEs
279 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
280 * acpi_leave_sleep_state will reenable specific GPEs later
282 acpi_disable_all_gpes();
283 /* Allow EC transactions to happen. */
284 acpi_ec_unblock_transactions_early();
286 suspend_nvs_restore();
288 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
291 static int acpi_suspend_state_valid(suspend_state_t pm_state)
293 u32 acpi_state;
295 switch (pm_state) {
296 case PM_SUSPEND_ON:
297 case PM_SUSPEND_STANDBY:
298 case PM_SUSPEND_MEM:
299 acpi_state = acpi_suspend_states[pm_state];
301 return sleep_states[acpi_state];
302 default:
303 return 0;
307 static const struct platform_suspend_ops acpi_suspend_ops = {
308 .valid = acpi_suspend_state_valid,
309 .begin = acpi_suspend_begin,
310 .prepare_late = acpi_pm_prepare,
311 .enter = acpi_suspend_enter,
312 .wake = acpi_pm_finish,
313 .end = acpi_pm_end,
317 * acpi_suspend_begin_old - Set the target system sleep state to the
318 * state associated with given @pm_state, if supported, and
319 * execute the _PTS control method. This function is used if the
320 * pre-ACPI 2.0 suspend ordering has been requested.
322 static int acpi_suspend_begin_old(suspend_state_t pm_state)
324 int error = acpi_suspend_begin(pm_state);
325 if (!error)
326 error = __acpi_pm_prepare();
328 return error;
332 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
333 * been requested.
335 static const struct platform_suspend_ops acpi_suspend_ops_old = {
336 .valid = acpi_suspend_state_valid,
337 .begin = acpi_suspend_begin_old,
338 .prepare_late = acpi_pm_pre_suspend,
339 .enter = acpi_suspend_enter,
340 .wake = acpi_pm_finish,
341 .end = acpi_pm_end,
342 .recover = acpi_pm_finish,
345 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
347 old_suspend_ordering = true;
348 return 0;
351 static int __init init_nvs_nosave(const struct dmi_system_id *d)
353 acpi_nvs_nosave();
354 return 0;
357 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
359 .callback = init_old_suspend_ordering,
360 .ident = "Abit KN9 (nForce4 variant)",
361 .matches = {
362 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
363 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
367 .callback = init_old_suspend_ordering,
368 .ident = "HP xw4600 Workstation",
369 .matches = {
370 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
371 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
375 .callback = init_old_suspend_ordering,
376 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
377 .matches = {
378 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
379 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
383 .callback = init_old_suspend_ordering,
384 .ident = "Panasonic CF51-2L",
385 .matches = {
386 DMI_MATCH(DMI_BOARD_VENDOR,
387 "Matsushita Electric Industrial Co.,Ltd."),
388 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
392 .callback = init_nvs_nosave,
393 .ident = "Sony Vaio VGN-SR11M",
394 .matches = {
395 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
396 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
400 .callback = init_nvs_nosave,
401 .ident = "Everex StepNote Series",
402 .matches = {
403 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
404 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
408 .callback = init_nvs_nosave,
409 .ident = "Sony Vaio VPCEB1Z1E",
410 .matches = {
411 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
412 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
416 .callback = init_nvs_nosave,
417 .ident = "Sony Vaio VGN-NW130D",
418 .matches = {
419 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
420 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
424 .callback = init_nvs_nosave,
425 .ident = "Averatec AV1020-ED2",
426 .matches = {
427 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
428 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
432 .callback = init_old_suspend_ordering,
433 .ident = "Asus A8N-SLI DELUXE",
434 .matches = {
435 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
436 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
440 .callback = init_old_suspend_ordering,
441 .ident = "Asus A8N-SLI Premium",
442 .matches = {
443 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
444 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
449 #endif /* CONFIG_SUSPEND */
451 #ifdef CONFIG_HIBERNATION
452 static unsigned long s4_hardware_signature;
453 static struct acpi_table_facs *facs;
454 static bool nosigcheck;
456 void __init acpi_no_s4_hw_signature(void)
458 nosigcheck = true;
461 static int acpi_hibernation_begin(void)
463 int error;
465 error = nvs_nosave ? 0 : suspend_nvs_alloc();
466 if (!error) {
467 acpi_target_sleep_state = ACPI_STATE_S4;
468 acpi_sleep_tts_switch(acpi_target_sleep_state);
471 return error;
474 static int acpi_hibernation_enter(void)
476 acpi_status status = AE_OK;
478 ACPI_FLUSH_CPU_CACHE();
480 /* This shouldn't return. If it returns, we have a problem */
481 status = acpi_enter_sleep_state(ACPI_STATE_S4);
482 /* Reprogram control registers and execute _BFS */
483 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
485 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
488 static void acpi_hibernation_leave(void)
491 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
492 * enable it here.
494 acpi_enable();
495 /* Reprogram control registers and execute _BFS */
496 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
497 /* Check the hardware signature */
498 if (facs && s4_hardware_signature != facs->hardware_signature) {
499 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
500 "cannot resume!\n");
501 panic("ACPI S4 hardware signature mismatch");
503 /* Restore the NVS memory area */
504 suspend_nvs_restore();
505 /* Allow EC transactions to happen. */
506 acpi_ec_unblock_transactions_early();
509 static void acpi_pm_thaw(void)
511 acpi_ec_unblock_transactions();
512 acpi_enable_all_runtime_gpes();
515 static const struct platform_hibernation_ops acpi_hibernation_ops = {
516 .begin = acpi_hibernation_begin,
517 .end = acpi_pm_end,
518 .pre_snapshot = acpi_pm_prepare,
519 .finish = acpi_pm_finish,
520 .prepare = acpi_pm_prepare,
521 .enter = acpi_hibernation_enter,
522 .leave = acpi_hibernation_leave,
523 .pre_restore = acpi_pm_freeze,
524 .restore_cleanup = acpi_pm_thaw,
528 * acpi_hibernation_begin_old - Set the target system sleep state to
529 * ACPI_STATE_S4 and execute the _PTS control method. This
530 * function is used if the pre-ACPI 2.0 suspend ordering has been
531 * requested.
533 static int acpi_hibernation_begin_old(void)
535 int error;
537 * The _TTS object should always be evaluated before the _PTS object.
538 * When the old_suspended_ordering is true, the _PTS object is
539 * evaluated in the acpi_sleep_prepare.
541 acpi_sleep_tts_switch(ACPI_STATE_S4);
543 error = acpi_sleep_prepare(ACPI_STATE_S4);
545 if (!error) {
546 if (!nvs_nosave)
547 error = suspend_nvs_alloc();
548 if (!error)
549 acpi_target_sleep_state = ACPI_STATE_S4;
551 return error;
555 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
556 * been requested.
558 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
559 .begin = acpi_hibernation_begin_old,
560 .end = acpi_pm_end,
561 .pre_snapshot = acpi_pm_pre_suspend,
562 .prepare = acpi_pm_freeze,
563 .finish = acpi_pm_finish,
564 .enter = acpi_hibernation_enter,
565 .leave = acpi_hibernation_leave,
566 .pre_restore = acpi_pm_freeze,
567 .restore_cleanup = acpi_pm_thaw,
568 .recover = acpi_pm_finish,
570 #endif /* CONFIG_HIBERNATION */
572 int acpi_suspend(u32 acpi_state)
574 suspend_state_t states[] = {
575 [1] = PM_SUSPEND_STANDBY,
576 [3] = PM_SUSPEND_MEM,
577 [5] = PM_SUSPEND_MAX
580 if (acpi_state < 6 && states[acpi_state])
581 return pm_suspend(states[acpi_state]);
582 if (acpi_state == 4)
583 return hibernate();
584 return -EINVAL;
587 #ifdef CONFIG_PM
589 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
590 * in the system sleep state given by %acpi_target_sleep_state
591 * @dev: device to examine; its driver model wakeup flags control
592 * whether it should be able to wake up the system
593 * @d_min_p: used to store the upper limit of allowed states range
594 * Return value: preferred power state of the device on success, -ENODEV on
595 * failure (ie. if there's no 'struct acpi_device' for @dev)
597 * Find the lowest power (highest number) ACPI device power state that
598 * device @dev can be in while the system is in the sleep state represented
599 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
600 * able to wake up the system from this sleep state. If @d_min_p is set,
601 * the highest power (lowest number) device power state of @dev allowed
602 * in this system sleep state is stored at the location pointed to by it.
604 * The caller must ensure that @dev is valid before using this function.
605 * The caller is also responsible for figuring out if the device is
606 * supposed to be able to wake up the system and passing this information
607 * via @wake.
610 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
612 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
613 struct acpi_device *adev;
614 char acpi_method[] = "_SxD";
615 unsigned long long d_min, d_max;
617 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
618 printk(KERN_DEBUG "ACPI handle has no context!\n");
619 return -ENODEV;
622 acpi_method[2] = '0' + acpi_target_sleep_state;
624 * If the sleep state is S0, we will return D3, but if the device has
625 * _S0W, we will use the value from _S0W
627 d_min = ACPI_STATE_D0;
628 d_max = ACPI_STATE_D3;
631 * If present, _SxD methods return the minimum D-state (highest power
632 * state) we can use for the corresponding S-states. Otherwise, the
633 * minimum D-state is D0 (ACPI 3.x).
635 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
636 * provided -- that's our fault recovery, we ignore retval.
638 if (acpi_target_sleep_state > ACPI_STATE_S0)
639 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
642 * If _PRW says we can wake up the system from the target sleep state,
643 * the D-state returned by _SxD is sufficient for that (we assume a
644 * wakeup-aware driver if wake is set). Still, if _SxW exists
645 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
646 * can wake the system. _S0W may be valid, too.
648 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
649 (device_may_wakeup(dev) &&
650 adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
651 acpi_status status;
653 acpi_method[3] = 'W';
654 status = acpi_evaluate_integer(handle, acpi_method, NULL,
655 &d_max);
656 if (ACPI_FAILURE(status)) {
657 if (acpi_target_sleep_state != ACPI_STATE_S0 ||
658 status != AE_NOT_FOUND)
659 d_max = d_min;
660 } else if (d_max < d_min) {
661 /* Warn the user of the broken DSDT */
662 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
663 acpi_method);
664 /* Sanitize it */
665 d_min = d_max;
669 if (d_min_p)
670 *d_min_p = d_min;
671 return d_max;
673 #endif /* CONFIG_PM */
675 #ifdef CONFIG_PM_SLEEP
677 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
678 * capability of given device
679 * @dev: device to handle
680 * @enable: 'true' - enable, 'false' - disable the wake-up capability
682 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
684 acpi_handle handle;
685 struct acpi_device *adev;
686 int error;
688 if (!device_can_wakeup(dev))
689 return -EINVAL;
691 handle = DEVICE_ACPI_HANDLE(dev);
692 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
693 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
694 return -ENODEV;
697 error = enable ?
698 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
699 acpi_disable_wakeup_device_power(adev);
700 if (!error)
701 dev_info(dev, "wake-up capability %s by ACPI\n",
702 enable ? "enabled" : "disabled");
704 return error;
706 #endif /* CONFIG_PM_SLEEP */
708 static void acpi_power_off_prepare(void)
710 /* Prepare to power off the system */
711 acpi_sleep_prepare(ACPI_STATE_S5);
712 acpi_disable_all_gpes();
715 static void acpi_power_off(void)
717 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
718 printk(KERN_DEBUG "%s called\n", __func__);
719 local_irq_disable();
720 acpi_enter_sleep_state(ACPI_STATE_S5);
724 * ACPI 2.0 created the optional _GTS and _BFS,
725 * but industry adoption has been neither rapid nor broad.
727 * Linux gets into trouble when it executes poorly validated
728 * paths through the BIOS, so disable _GTS and _BFS by default,
729 * but do speak up and offer the option to enable them.
731 static void __init acpi_gts_bfs_check(void)
733 acpi_handle dummy;
735 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
737 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
738 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
739 "please notify linux-acpi@vger.kernel.org\n");
741 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
743 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
744 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
745 "please notify linux-acpi@vger.kernel.org\n");
749 int __init acpi_sleep_init(void)
751 acpi_status status;
752 u8 type_a, type_b;
753 #ifdef CONFIG_SUSPEND
754 int i = 0;
756 dmi_check_system(acpisleep_dmi_table);
757 #endif
759 if (acpi_disabled)
760 return 0;
762 sleep_states[ACPI_STATE_S0] = 1;
763 printk(KERN_INFO PREFIX "(supports S0");
765 #ifdef CONFIG_SUSPEND
766 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
767 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
768 if (ACPI_SUCCESS(status)) {
769 sleep_states[i] = 1;
770 printk(" S%d", i);
774 suspend_set_ops(old_suspend_ordering ?
775 &acpi_suspend_ops_old : &acpi_suspend_ops);
776 #endif
778 #ifdef CONFIG_HIBERNATION
779 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
780 if (ACPI_SUCCESS(status)) {
781 hibernation_set_ops(old_suspend_ordering ?
782 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
783 sleep_states[ACPI_STATE_S4] = 1;
784 printk(" S4");
785 if (!nosigcheck) {
786 acpi_get_table(ACPI_SIG_FACS, 1,
787 (struct acpi_table_header **)&facs);
788 if (facs)
789 s4_hardware_signature =
790 facs->hardware_signature;
793 #endif
794 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
795 if (ACPI_SUCCESS(status)) {
796 sleep_states[ACPI_STATE_S5] = 1;
797 printk(" S5");
798 pm_power_off_prepare = acpi_power_off_prepare;
799 pm_power_off = acpi_power_off;
801 printk(")\n");
803 * Register the tts_notifier to reboot notifier list so that the _TTS
804 * object can also be evaluated when the system enters S5.
806 register_reboot_notifier(&tts_notifier);
807 acpi_gts_bfs_check();
808 return 0;