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>
20 #include <linux/module.h>
26 static u8 sleep_states
[ACPI_S_STATE_COUNT
];
28 static void acpi_sleep_tts_switch(u32 acpi_state
)
32 status
= acpi_execute_simple_method(NULL
, "\\_TTS", acpi_state
);
33 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
35 * OS can't evaluate the _TTS object correctly. Some warning
36 * message will be printed. But it won't break anything.
38 printk(KERN_NOTICE
"Failure in evaluating _TTS object\n");
42 static int tts_notify_reboot(struct notifier_block
*this,
43 unsigned long code
, void *x
)
45 acpi_sleep_tts_switch(ACPI_STATE_S5
);
49 static struct notifier_block tts_notifier
= {
50 .notifier_call
= tts_notify_reboot
,
55 static int acpi_sleep_prepare(u32 acpi_state
)
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
)
62 acpi_set_firmware_waking_vector(acpi_wakeup_address
);
65 ACPI_FLUSH_CPU_CACHE();
67 printk(KERN_INFO PREFIX
"Preparing to enter system sleep state S%d\n",
69 acpi_enable_wakeup_devices(acpi_state
);
70 acpi_enter_sleep_state_prep(acpi_state
);
74 static bool acpi_sleep_state_supported(u8 sleep_state
)
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
));
85 #ifdef CONFIG_ACPI_SLEEP
86 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
88 u32
acpi_target_system_state(void)
90 return acpi_target_sleep_state
;
92 EXPORT_SYMBOL_GPL(acpi_target_system_state
);
94 static bool pwr_btn_event_pending
;
97 * The ACPI specification wants us to save NVS memory regions during hibernation
98 * and to restore them during the subsequent resume. Windows does that also for
99 * suspend to RAM. However, it is known that this mechanism does not work on
100 * all machines, so we allow the user to disable it with the help of the
101 * 'acpi_sleep=nonvs' kernel command line option.
103 static bool nvs_nosave
;
105 void __init
acpi_nvs_nosave(void)
111 * The ACPI specification wants us to save NVS memory regions during hibernation
112 * but says nothing about saving NVS during S3. Not all versions of Windows
113 * save NVS on S3 suspend either, and it is clear that not all systems need
114 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
115 * user to disable saving NVS on S3 if their system does not require it, but
116 * continue to save/restore NVS for S4 as specified.
118 static bool nvs_nosave_s3
;
120 void __init
acpi_nvs_nosave_s3(void)
122 nvs_nosave_s3
= true;
126 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
127 * user to request that behavior by using the 'acpi_old_suspend_ordering'
128 * kernel command line option that causes the following variable to be set.
130 static bool old_suspend_ordering
;
132 void __init
acpi_old_suspend_ordering(void)
134 old_suspend_ordering
= true;
137 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
139 acpi_old_suspend_ordering();
143 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
149 static struct dmi_system_id acpisleep_dmi_table
[] __initdata
= {
151 .callback
= init_old_suspend_ordering
,
152 .ident
= "Abit KN9 (nForce4 variant)",
154 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
155 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
159 .callback
= init_old_suspend_ordering
,
160 .ident
= "HP xw4600 Workstation",
162 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
163 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
167 .callback
= init_old_suspend_ordering
,
168 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
170 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
171 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
175 .callback
= init_old_suspend_ordering
,
176 .ident
= "Panasonic CF51-2L",
178 DMI_MATCH(DMI_BOARD_VENDOR
,
179 "Matsushita Electric Industrial Co.,Ltd."),
180 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
184 .callback
= init_nvs_nosave
,
185 .ident
= "Sony Vaio VGN-FW41E_H",
187 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
188 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW41E_H"),
192 .callback
= init_nvs_nosave
,
193 .ident
= "Sony Vaio VGN-FW21E",
195 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
196 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
200 .callback
= init_nvs_nosave
,
201 .ident
= "Sony Vaio VGN-FW21M",
203 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
204 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21M"),
208 .callback
= init_nvs_nosave
,
209 .ident
= "Sony Vaio VPCEB17FX",
211 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
212 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
216 .callback
= init_nvs_nosave
,
217 .ident
= "Sony Vaio VGN-SR11M",
219 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
220 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
224 .callback
= init_nvs_nosave
,
225 .ident
= "Everex StepNote Series",
227 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
228 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
232 .callback
= init_nvs_nosave
,
233 .ident
= "Sony Vaio VPCEB1Z1E",
235 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
236 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
240 .callback
= init_nvs_nosave
,
241 .ident
= "Sony Vaio VGN-NW130D",
243 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
244 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
248 .callback
= init_nvs_nosave
,
249 .ident
= "Sony Vaio VPCCW29FX",
251 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
252 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
256 .callback
= init_nvs_nosave
,
257 .ident
= "Averatec AV1020-ED2",
259 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
260 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
264 .callback
= init_old_suspend_ordering
,
265 .ident
= "Asus A8N-SLI DELUXE",
267 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
268 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
272 .callback
= init_old_suspend_ordering
,
273 .ident
= "Asus A8N-SLI Premium",
275 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
276 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
280 .callback
= init_nvs_nosave
,
281 .ident
= "Sony Vaio VGN-SR26GN_P",
283 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
284 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
288 .callback
= init_nvs_nosave
,
289 .ident
= "Sony Vaio VPCEB1S1E",
291 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
292 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1S1E"),
296 .callback
= init_nvs_nosave
,
297 .ident
= "Sony Vaio VGN-FW520F",
299 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
300 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
304 .callback
= init_nvs_nosave
,
305 .ident
= "Asus K54C",
307 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
308 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
312 .callback
= init_nvs_nosave
,
313 .ident
= "Asus K54HR",
315 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
316 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
322 static void acpi_sleep_dmi_check(void)
324 dmi_check_system(acpisleep_dmi_table
);
328 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
330 static int acpi_pm_freeze(void)
332 acpi_disable_all_gpes();
333 acpi_os_wait_events_complete();
334 acpi_ec_block_transactions();
339 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
341 static int acpi_pm_pre_suspend(void)
344 return suspend_nvs_save();
348 * __acpi_pm_prepare - Prepare the platform to enter the target state.
350 * If necessary, set the firmware waking vector and do arch-specific
351 * nastiness to get the wakeup code to the waking vector.
353 static int __acpi_pm_prepare(void)
355 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
357 acpi_target_sleep_state
= ACPI_STATE_S0
;
363 * acpi_pm_prepare - Prepare the platform to enter the target sleep
364 * state and disable the GPEs.
366 static int acpi_pm_prepare(void)
368 int error
= __acpi_pm_prepare();
370 error
= acpi_pm_pre_suspend();
375 static int find_powerf_dev(struct device
*dev
, void *data
)
377 struct acpi_device
*device
= to_acpi_device(dev
);
378 const char *hid
= acpi_device_hid(device
);
380 return !strcmp(hid
, ACPI_BUTTON_HID_POWERF
);
384 * acpi_pm_finish - Instruct the platform to leave a sleep state.
386 * This is called after we wake back up (or if entering the sleep state
389 static void acpi_pm_finish(void)
391 struct device
*pwr_btn_dev
;
392 u32 acpi_state
= acpi_target_sleep_state
;
394 acpi_ec_unblock_transactions();
397 if (acpi_state
== ACPI_STATE_S0
)
400 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
402 acpi_disable_wakeup_devices(acpi_state
);
403 acpi_leave_sleep_state(acpi_state
);
405 /* reset firmware waking vector */
406 acpi_set_firmware_waking_vector((acpi_physical_address
) 0);
408 acpi_target_sleep_state
= ACPI_STATE_S0
;
410 acpi_resume_power_resources();
412 /* If we were woken with the fixed power button, provide a small
413 * hint to userspace in the form of a wakeup event on the fixed power
414 * button device (if it can be found).
416 * We delay the event generation til now, as the PM layer requires
417 * timekeeping to be running before we generate events. */
418 if (!pwr_btn_event_pending
)
421 pwr_btn_event_pending
= false;
422 pwr_btn_dev
= bus_find_device(&acpi_bus_type
, NULL
, NULL
,
425 pm_wakeup_event(pwr_btn_dev
, 0);
426 put_device(pwr_btn_dev
);
431 * acpi_pm_start - Start system PM transition.
433 static void acpi_pm_start(u32 acpi_state
)
435 acpi_target_sleep_state
= acpi_state
;
436 acpi_sleep_tts_switch(acpi_target_sleep_state
);
437 acpi_scan_lock_acquire();
441 * acpi_pm_end - Finish up system PM transition.
443 static void acpi_pm_end(void)
445 acpi_scan_lock_release();
447 * This is necessary in case acpi_pm_finish() is not called during a
448 * failing transition to a sleep state.
450 acpi_target_sleep_state
= ACPI_STATE_S0
;
451 acpi_sleep_tts_switch(acpi_target_sleep_state
);
453 #else /* !CONFIG_ACPI_SLEEP */
454 #define acpi_target_sleep_state ACPI_STATE_S0
455 static inline void acpi_sleep_dmi_check(void) {}
456 #endif /* CONFIG_ACPI_SLEEP */
458 #ifdef CONFIG_SUSPEND
459 static u32 acpi_suspend_states
[] = {
460 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
461 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
462 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
463 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
467 * acpi_suspend_begin - Set the target system sleep state to the state
468 * associated with given @pm_state, if supported.
470 static int acpi_suspend_begin(suspend_state_t pm_state
)
472 u32 acpi_state
= acpi_suspend_states
[pm_state
];
475 error
= (nvs_nosave
|| nvs_nosave_s3
) ? 0 : suspend_nvs_alloc();
479 if (!sleep_states
[acpi_state
]) {
480 pr_err("ACPI does not support sleep state S%u\n", acpi_state
);
484 acpi_pm_start(acpi_state
);
489 * acpi_suspend_enter - Actually enter a sleep state.
492 * Flush caches and go to sleep. For STR we have to call arch-specific
493 * assembly, which in turn call acpi_enter_sleep_state().
494 * It's unfortunate, but it works. Please fix if you're feeling frisky.
496 static int acpi_suspend_enter(suspend_state_t pm_state
)
498 acpi_status status
= AE_OK
;
499 u32 acpi_state
= acpi_target_sleep_state
;
502 ACPI_FLUSH_CPU_CACHE();
504 switch (acpi_state
) {
507 status
= acpi_enter_sleep_state(acpi_state
);
511 if (!acpi_suspend_lowlevel
)
513 error
= acpi_suspend_lowlevel();
516 pr_info(PREFIX
"Low-level resume complete\n");
520 /* This violates the spec but is required for bug compatibility. */
521 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
523 /* Reprogram control registers */
524 acpi_leave_sleep_state_prep(acpi_state
);
526 /* ACPI 3.0 specs (P62) says that it's the responsibility
527 * of the OSPM to clear the status bit [ implying that the
528 * POWER_BUTTON event should not reach userspace ]
530 * However, we do generate a small hint for userspace in the form of
531 * a wakeup event. We flag this condition for now and generate the
532 * event later, as we're currently too early in resume to be able to
533 * generate wakeup events.
535 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
)) {
536 acpi_event_status pwr_btn_status
= ACPI_EVENT_FLAG_DISABLED
;
538 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON
, &pwr_btn_status
);
540 if (pwr_btn_status
& ACPI_EVENT_FLAG_SET
) {
541 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
543 pwr_btn_event_pending
= true;
548 * Disable and clear GPE status before interrupt is enabled. Some GPEs
549 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
550 * acpi_leave_sleep_state will reenable specific GPEs later
552 acpi_disable_all_gpes();
553 /* Allow EC transactions to happen. */
554 acpi_ec_unblock_transactions_early();
556 suspend_nvs_restore();
558 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
561 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
567 case PM_SUSPEND_STANDBY
:
569 acpi_state
= acpi_suspend_states
[pm_state
];
571 return sleep_states
[acpi_state
];
577 static const struct platform_suspend_ops acpi_suspend_ops
= {
578 .valid
= acpi_suspend_state_valid
,
579 .begin
= acpi_suspend_begin
,
580 .prepare_late
= acpi_pm_prepare
,
581 .enter
= acpi_suspend_enter
,
582 .wake
= acpi_pm_finish
,
587 * acpi_suspend_begin_old - Set the target system sleep state to the
588 * state associated with given @pm_state, if supported, and
589 * execute the _PTS control method. This function is used if the
590 * pre-ACPI 2.0 suspend ordering has been requested.
592 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
594 int error
= acpi_suspend_begin(pm_state
);
596 error
= __acpi_pm_prepare();
602 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
605 static const struct platform_suspend_ops acpi_suspend_ops_old
= {
606 .valid
= acpi_suspend_state_valid
,
607 .begin
= acpi_suspend_begin_old
,
608 .prepare_late
= acpi_pm_pre_suspend
,
609 .enter
= acpi_suspend_enter
,
610 .wake
= acpi_pm_finish
,
612 .recover
= acpi_pm_finish
,
615 static int acpi_freeze_begin(void)
617 acpi_scan_lock_acquire();
621 static void acpi_freeze_end(void)
623 acpi_scan_lock_release();
626 static const struct platform_freeze_ops acpi_freeze_ops
= {
627 .begin
= acpi_freeze_begin
,
628 .end
= acpi_freeze_end
,
631 static void acpi_sleep_suspend_setup(void)
635 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++)
636 if (acpi_sleep_state_supported(i
))
639 suspend_set_ops(old_suspend_ordering
?
640 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
641 freeze_set_ops(&acpi_freeze_ops
);
644 #else /* !CONFIG_SUSPEND */
645 static inline void acpi_sleep_suspend_setup(void) {}
646 #endif /* !CONFIG_SUSPEND */
648 #ifdef CONFIG_HIBERNATION
649 static unsigned long s4_hardware_signature
;
650 static struct acpi_table_facs
*facs
;
651 static bool nosigcheck
;
653 void __init
acpi_no_s4_hw_signature(void)
658 static int acpi_hibernation_begin(void)
662 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
664 acpi_pm_start(ACPI_STATE_S4
);
669 static int acpi_hibernation_enter(void)
671 acpi_status status
= AE_OK
;
673 ACPI_FLUSH_CPU_CACHE();
675 /* This shouldn't return. If it returns, we have a problem */
676 status
= acpi_enter_sleep_state(ACPI_STATE_S4
);
677 /* Reprogram control registers */
678 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
680 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
683 static void acpi_hibernation_leave(void)
686 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
690 /* Reprogram control registers */
691 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
692 /* Check the hardware signature */
693 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
)
694 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
695 /* Restore the NVS memory area */
696 suspend_nvs_restore();
697 /* Allow EC transactions to happen. */
698 acpi_ec_unblock_transactions_early();
701 static void acpi_pm_thaw(void)
703 acpi_ec_unblock_transactions();
704 acpi_enable_all_runtime_gpes();
707 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
708 .begin
= acpi_hibernation_begin
,
710 .pre_snapshot
= acpi_pm_prepare
,
711 .finish
= acpi_pm_finish
,
712 .prepare
= acpi_pm_prepare
,
713 .enter
= acpi_hibernation_enter
,
714 .leave
= acpi_hibernation_leave
,
715 .pre_restore
= acpi_pm_freeze
,
716 .restore_cleanup
= acpi_pm_thaw
,
720 * acpi_hibernation_begin_old - Set the target system sleep state to
721 * ACPI_STATE_S4 and execute the _PTS control method. This
722 * function is used if the pre-ACPI 2.0 suspend ordering has been
725 static int acpi_hibernation_begin_old(void)
729 * The _TTS object should always be evaluated before the _PTS object.
730 * When the old_suspended_ordering is true, the _PTS object is
731 * evaluated in the acpi_sleep_prepare.
733 acpi_sleep_tts_switch(ACPI_STATE_S4
);
735 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
739 error
= suspend_nvs_alloc();
741 acpi_target_sleep_state
= ACPI_STATE_S4
;
742 acpi_scan_lock_acquire();
749 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
752 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
753 .begin
= acpi_hibernation_begin_old
,
755 .pre_snapshot
= acpi_pm_pre_suspend
,
756 .prepare
= acpi_pm_freeze
,
757 .finish
= acpi_pm_finish
,
758 .enter
= acpi_hibernation_enter
,
759 .leave
= acpi_hibernation_leave
,
760 .pre_restore
= acpi_pm_freeze
,
761 .restore_cleanup
= acpi_pm_thaw
,
762 .recover
= acpi_pm_finish
,
765 static void acpi_sleep_hibernate_setup(void)
767 if (!acpi_sleep_state_supported(ACPI_STATE_S4
))
770 hibernation_set_ops(old_suspend_ordering
?
771 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
772 sleep_states
[ACPI_STATE_S4
] = 1;
776 acpi_get_table(ACPI_SIG_FACS
, 1, (struct acpi_table_header
**)&facs
);
778 s4_hardware_signature
= facs
->hardware_signature
;
780 #else /* !CONFIG_HIBERNATION */
781 static inline void acpi_sleep_hibernate_setup(void) {}
782 #endif /* !CONFIG_HIBERNATION */
784 int acpi_suspend(u32 acpi_state
)
786 suspend_state_t states
[] = {
787 [1] = PM_SUSPEND_STANDBY
,
788 [3] = PM_SUSPEND_MEM
,
792 if (acpi_state
< 6 && states
[acpi_state
])
793 return pm_suspend(states
[acpi_state
]);
799 static void acpi_power_off_prepare(void)
801 /* Prepare to power off the system */
802 acpi_sleep_prepare(ACPI_STATE_S5
);
803 acpi_disable_all_gpes();
806 static void acpi_power_off(void)
808 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
809 printk(KERN_DEBUG
"%s called\n", __func__
);
811 acpi_enter_sleep_state(ACPI_STATE_S5
);
814 int __init
acpi_sleep_init(void)
816 char supported
[ACPI_S_STATE_COUNT
* 3 + 1];
817 char *pos
= supported
;
820 acpi_sleep_dmi_check();
822 sleep_states
[ACPI_STATE_S0
] = 1;
824 acpi_sleep_suspend_setup();
825 acpi_sleep_hibernate_setup();
827 if (acpi_sleep_state_supported(ACPI_STATE_S5
)) {
828 sleep_states
[ACPI_STATE_S5
] = 1;
829 pm_power_off_prepare
= acpi_power_off_prepare
;
830 pm_power_off
= acpi_power_off
;
834 for (i
= 0; i
< ACPI_S_STATE_COUNT
; i
++) {
836 pos
+= sprintf(pos
, " S%d", i
);
838 pr_info(PREFIX
"(supports%s)\n", supported
);
841 * Register the tts_notifier to reboot notifier list so that the _TTS
842 * object can also be evaluated when the system enters S5.
844 register_reboot_notifier(&tts_notifier
);