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/interrupt.h>
18 #include <linux/suspend.h>
19 #include <linux/reboot.h>
20 #include <linux/acpi.h>
21 #include <linux/module.h>
23 #include <trace/events/power.h>
28 static u8 sleep_states
[ACPI_S_STATE_COUNT
];
30 static void acpi_sleep_tts_switch(u32 acpi_state
)
34 status
= acpi_execute_simple_method(NULL
, "\\_TTS", acpi_state
);
35 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
37 * OS can't evaluate the _TTS object correctly. Some warning
38 * message will be printed. But it won't break anything.
40 printk(KERN_NOTICE
"Failure in evaluating _TTS object\n");
44 static int tts_notify_reboot(struct notifier_block
*this,
45 unsigned long code
, void *x
)
47 acpi_sleep_tts_switch(ACPI_STATE_S5
);
51 static struct notifier_block tts_notifier
= {
52 .notifier_call
= tts_notify_reboot
,
57 static int acpi_sleep_prepare(u32 acpi_state
)
59 #ifdef CONFIG_ACPI_SLEEP
60 /* do we have a wakeup address for S2 and S3? */
61 if (acpi_state
== ACPI_STATE_S3
) {
62 if (!acpi_wakeup_address
)
64 acpi_set_firmware_waking_vector(acpi_wakeup_address
);
67 ACPI_FLUSH_CPU_CACHE();
69 printk(KERN_INFO PREFIX
"Preparing to enter system sleep state S%d\n",
71 acpi_enable_wakeup_devices(acpi_state
);
72 acpi_enter_sleep_state_prep(acpi_state
);
76 static bool acpi_sleep_state_supported(u8 sleep_state
)
81 status
= acpi_get_sleep_type_data(sleep_state
, &type_a
, &type_b
);
82 return ACPI_SUCCESS(status
) && (!acpi_gbl_reduced_hardware
83 || (acpi_gbl_FADT
.sleep_control
.address
84 && acpi_gbl_FADT
.sleep_status
.address
));
87 #ifdef CONFIG_ACPI_SLEEP
88 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
90 u32
acpi_target_system_state(void)
92 return acpi_target_sleep_state
;
94 EXPORT_SYMBOL_GPL(acpi_target_system_state
);
96 static bool pwr_btn_event_pending
;
99 * The ACPI specification wants us to save NVS memory regions during hibernation
100 * and to restore them during the subsequent resume. Windows does that also for
101 * suspend to RAM. However, it is known that this mechanism does not work on
102 * all machines, so we allow the user to disable it with the help of the
103 * 'acpi_sleep=nonvs' kernel command line option.
105 static bool nvs_nosave
;
107 void __init
acpi_nvs_nosave(void)
113 * The ACPI specification wants us to save NVS memory regions during hibernation
114 * but says nothing about saving NVS during S3. Not all versions of Windows
115 * save NVS on S3 suspend either, and it is clear that not all systems need
116 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
117 * user to disable saving NVS on S3 if their system does not require it, but
118 * continue to save/restore NVS for S4 as specified.
120 static bool nvs_nosave_s3
;
122 void __init
acpi_nvs_nosave_s3(void)
124 nvs_nosave_s3
= true;
127 static int __init
init_nvs_save_s3(const struct dmi_system_id
*d
)
129 nvs_nosave_s3
= false;
134 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
135 * user to request that behavior by using the 'acpi_old_suspend_ordering'
136 * kernel command line option that causes the following variable to be set.
138 static bool old_suspend_ordering
;
140 void __init
acpi_old_suspend_ordering(void)
142 old_suspend_ordering
= true;
145 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
147 acpi_old_suspend_ordering();
151 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
157 static struct dmi_system_id acpisleep_dmi_table
[] __initdata
= {
159 .callback
= init_old_suspend_ordering
,
160 .ident
= "Abit KN9 (nForce4 variant)",
162 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
163 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
167 .callback
= init_old_suspend_ordering
,
168 .ident
= "HP xw4600 Workstation",
170 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
171 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
175 .callback
= init_old_suspend_ordering
,
176 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
178 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
179 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
183 .callback
= init_old_suspend_ordering
,
184 .ident
= "Panasonic CF51-2L",
186 DMI_MATCH(DMI_BOARD_VENDOR
,
187 "Matsushita Electric Industrial Co.,Ltd."),
188 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
192 .callback
= init_nvs_nosave
,
193 .ident
= "Sony Vaio VGN-FW41E_H",
195 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
196 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW41E_H"),
200 .callback
= init_nvs_nosave
,
201 .ident
= "Sony Vaio VGN-FW21E",
203 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
204 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
208 .callback
= init_nvs_nosave
,
209 .ident
= "Sony Vaio VGN-FW21M",
211 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
212 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21M"),
216 .callback
= init_nvs_nosave
,
217 .ident
= "Sony Vaio VPCEB17FX",
219 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
220 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
224 .callback
= init_nvs_nosave
,
225 .ident
= "Sony Vaio VGN-SR11M",
227 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
228 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
232 .callback
= init_nvs_nosave
,
233 .ident
= "Everex StepNote Series",
235 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
236 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
240 .callback
= init_nvs_nosave
,
241 .ident
= "Sony Vaio VPCEB1Z1E",
243 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
244 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
248 .callback
= init_nvs_nosave
,
249 .ident
= "Sony Vaio VGN-NW130D",
251 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
252 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
256 .callback
= init_nvs_nosave
,
257 .ident
= "Sony Vaio VPCCW29FX",
259 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
260 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
264 .callback
= init_nvs_nosave
,
265 .ident
= "Averatec AV1020-ED2",
267 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
268 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
272 .callback
= init_old_suspend_ordering
,
273 .ident
= "Asus A8N-SLI DELUXE",
275 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
276 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
280 .callback
= init_old_suspend_ordering
,
281 .ident
= "Asus A8N-SLI Premium",
283 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
284 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
288 .callback
= init_nvs_nosave
,
289 .ident
= "Sony Vaio VGN-SR26GN_P",
291 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
292 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
296 .callback
= init_nvs_nosave
,
297 .ident
= "Sony Vaio VPCEB1S1E",
299 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
300 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1S1E"),
304 .callback
= init_nvs_nosave
,
305 .ident
= "Sony Vaio VGN-FW520F",
307 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
308 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
312 .callback
= init_nvs_nosave
,
313 .ident
= "Asus K54C",
315 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
316 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
320 .callback
= init_nvs_nosave
,
321 .ident
= "Asus K54HR",
323 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
324 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
328 .callback
= init_nvs_save_s3
,
329 .ident
= "Asus 1025C",
331 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK COMPUTER INC."),
332 DMI_MATCH(DMI_PRODUCT_NAME
, "1025C"),
336 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
337 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
341 .callback
= init_nvs_save_s3
,
342 .ident
= "Lenovo G50-45",
344 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
345 DMI_MATCH(DMI_PRODUCT_NAME
, "80E3"),
351 static void __init
acpi_sleep_dmi_check(void)
355 if (dmi_get_date(DMI_BIOS_DATE
, &year
, NULL
, NULL
) && year
>= 2012)
356 acpi_nvs_nosave_s3();
358 dmi_check_system(acpisleep_dmi_table
);
362 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
364 static int acpi_pm_freeze(void)
366 acpi_disable_all_gpes();
367 acpi_os_wait_events_complete();
368 acpi_ec_block_transactions();
373 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
375 static int acpi_pm_pre_suspend(void)
378 return suspend_nvs_save();
382 * __acpi_pm_prepare - Prepare the platform to enter the target state.
384 * If necessary, set the firmware waking vector and do arch-specific
385 * nastiness to get the wakeup code to the waking vector.
387 static int __acpi_pm_prepare(void)
389 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
391 acpi_target_sleep_state
= ACPI_STATE_S0
;
397 * acpi_pm_prepare - Prepare the platform to enter the target sleep
398 * state and disable the GPEs.
400 static int acpi_pm_prepare(void)
402 int error
= __acpi_pm_prepare();
404 error
= acpi_pm_pre_suspend();
409 static int find_powerf_dev(struct device
*dev
, void *data
)
411 struct acpi_device
*device
= to_acpi_device(dev
);
412 const char *hid
= acpi_device_hid(device
);
414 return !strcmp(hid
, ACPI_BUTTON_HID_POWERF
);
418 * acpi_pm_finish - Instruct the platform to leave a sleep state.
420 * This is called after we wake back up (or if entering the sleep state
423 static void acpi_pm_finish(void)
425 struct device
*pwr_btn_dev
;
426 u32 acpi_state
= acpi_target_sleep_state
;
428 acpi_ec_unblock_transactions();
431 if (acpi_state
== ACPI_STATE_S0
)
434 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
436 acpi_disable_wakeup_devices(acpi_state
);
437 acpi_leave_sleep_state(acpi_state
);
439 /* reset firmware waking vector */
440 acpi_set_firmware_waking_vector((acpi_physical_address
) 0);
442 acpi_target_sleep_state
= ACPI_STATE_S0
;
444 acpi_resume_power_resources();
446 /* If we were woken with the fixed power button, provide a small
447 * hint to userspace in the form of a wakeup event on the fixed power
448 * button device (if it can be found).
450 * We delay the event generation til now, as the PM layer requires
451 * timekeeping to be running before we generate events. */
452 if (!pwr_btn_event_pending
)
455 pwr_btn_event_pending
= false;
456 pwr_btn_dev
= bus_find_device(&acpi_bus_type
, NULL
, NULL
,
459 pm_wakeup_event(pwr_btn_dev
, 0);
460 put_device(pwr_btn_dev
);
465 * acpi_pm_start - Start system PM transition.
467 static void acpi_pm_start(u32 acpi_state
)
469 acpi_target_sleep_state
= acpi_state
;
470 acpi_sleep_tts_switch(acpi_target_sleep_state
);
471 acpi_scan_lock_acquire();
475 * acpi_pm_end - Finish up system PM transition.
477 static void acpi_pm_end(void)
479 acpi_scan_lock_release();
481 * This is necessary in case acpi_pm_finish() is not called during a
482 * failing transition to a sleep state.
484 acpi_target_sleep_state
= ACPI_STATE_S0
;
485 acpi_sleep_tts_switch(acpi_target_sleep_state
);
487 #else /* !CONFIG_ACPI_SLEEP */
488 #define acpi_target_sleep_state ACPI_STATE_S0
489 static inline void acpi_sleep_dmi_check(void) {}
490 #endif /* CONFIG_ACPI_SLEEP */
492 #ifdef CONFIG_SUSPEND
493 static u32 acpi_suspend_states
[] = {
494 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
495 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
496 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
497 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
501 * acpi_suspend_begin - Set the target system sleep state to the state
502 * associated with given @pm_state, if supported.
504 static int acpi_suspend_begin(suspend_state_t pm_state
)
506 u32 acpi_state
= acpi_suspend_states
[pm_state
];
509 error
= (nvs_nosave
|| nvs_nosave_s3
) ? 0 : suspend_nvs_alloc();
513 if (!sleep_states
[acpi_state
]) {
514 pr_err("ACPI does not support sleep state S%u\n", acpi_state
);
517 if (acpi_state
> ACPI_STATE_S1
)
518 pm_set_suspend_via_firmware();
520 acpi_pm_start(acpi_state
);
525 * acpi_suspend_enter - Actually enter a sleep state.
528 * Flush caches and go to sleep. For STR we have to call arch-specific
529 * assembly, which in turn call acpi_enter_sleep_state().
530 * It's unfortunate, but it works. Please fix if you're feeling frisky.
532 static int acpi_suspend_enter(suspend_state_t pm_state
)
534 acpi_status status
= AE_OK
;
535 u32 acpi_state
= acpi_target_sleep_state
;
538 ACPI_FLUSH_CPU_CACHE();
540 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, true);
541 switch (acpi_state
) {
544 status
= acpi_enter_sleep_state(acpi_state
);
548 if (!acpi_suspend_lowlevel
)
550 error
= acpi_suspend_lowlevel();
553 pr_info(PREFIX
"Low-level resume complete\n");
554 pm_set_resume_via_firmware();
557 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, false);
559 /* This violates the spec but is required for bug compatibility. */
560 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
562 /* Reprogram control registers */
563 acpi_leave_sleep_state_prep(acpi_state
);
565 /* ACPI 3.0 specs (P62) says that it's the responsibility
566 * of the OSPM to clear the status bit [ implying that the
567 * POWER_BUTTON event should not reach userspace ]
569 * However, we do generate a small hint for userspace in the form of
570 * a wakeup event. We flag this condition for now and generate the
571 * event later, as we're currently too early in resume to be able to
572 * generate wakeup events.
574 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
)) {
575 acpi_event_status pwr_btn_status
= ACPI_EVENT_FLAG_DISABLED
;
577 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON
, &pwr_btn_status
);
579 if (pwr_btn_status
& ACPI_EVENT_FLAG_SET
) {
580 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
582 pwr_btn_event_pending
= true;
587 * Disable and clear GPE status before interrupt is enabled. Some GPEs
588 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
589 * acpi_leave_sleep_state will reenable specific GPEs later
591 acpi_disable_all_gpes();
592 /* Allow EC transactions to happen. */
593 acpi_ec_unblock_transactions_early();
595 suspend_nvs_restore();
597 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
600 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
606 case PM_SUSPEND_STANDBY
:
608 acpi_state
= acpi_suspend_states
[pm_state
];
610 return sleep_states
[acpi_state
];
616 static const struct platform_suspend_ops acpi_suspend_ops
= {
617 .valid
= acpi_suspend_state_valid
,
618 .begin
= acpi_suspend_begin
,
619 .prepare_late
= acpi_pm_prepare
,
620 .enter
= acpi_suspend_enter
,
621 .wake
= acpi_pm_finish
,
626 * acpi_suspend_begin_old - Set the target system sleep state to the
627 * state associated with given @pm_state, if supported, and
628 * execute the _PTS control method. This function is used if the
629 * pre-ACPI 2.0 suspend ordering has been requested.
631 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
633 int error
= acpi_suspend_begin(pm_state
);
635 error
= __acpi_pm_prepare();
641 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
644 static const struct platform_suspend_ops acpi_suspend_ops_old
= {
645 .valid
= acpi_suspend_state_valid
,
646 .begin
= acpi_suspend_begin_old
,
647 .prepare_late
= acpi_pm_pre_suspend
,
648 .enter
= acpi_suspend_enter
,
649 .wake
= acpi_pm_finish
,
651 .recover
= acpi_pm_finish
,
654 static int acpi_freeze_begin(void)
656 acpi_scan_lock_acquire();
660 static int acpi_freeze_prepare(void)
662 acpi_enable_wakeup_devices(ACPI_STATE_S0
);
663 acpi_enable_all_wakeup_gpes();
664 acpi_os_wait_events_complete();
665 if (acpi_sci_irq_valid())
666 enable_irq_wake(acpi_sci_irq
);
670 static void acpi_freeze_restore(void)
672 acpi_disable_wakeup_devices(ACPI_STATE_S0
);
673 if (acpi_sci_irq_valid())
674 disable_irq_wake(acpi_sci_irq
);
675 acpi_enable_all_runtime_gpes();
678 static void acpi_freeze_end(void)
680 acpi_scan_lock_release();
683 static const struct platform_freeze_ops acpi_freeze_ops
= {
684 .begin
= acpi_freeze_begin
,
685 .prepare
= acpi_freeze_prepare
,
686 .restore
= acpi_freeze_restore
,
687 .end
= acpi_freeze_end
,
690 static void acpi_sleep_suspend_setup(void)
694 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++)
695 if (acpi_sleep_state_supported(i
))
698 suspend_set_ops(old_suspend_ordering
?
699 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
700 freeze_set_ops(&acpi_freeze_ops
);
703 #else /* !CONFIG_SUSPEND */
704 static inline void acpi_sleep_suspend_setup(void) {}
705 #endif /* !CONFIG_SUSPEND */
707 #ifdef CONFIG_HIBERNATION
708 static unsigned long s4_hardware_signature
;
709 static struct acpi_table_facs
*facs
;
710 static bool nosigcheck
;
712 void __init
acpi_no_s4_hw_signature(void)
717 static int acpi_hibernation_begin(void)
721 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
723 acpi_pm_start(ACPI_STATE_S4
);
728 static int acpi_hibernation_enter(void)
730 acpi_status status
= AE_OK
;
732 ACPI_FLUSH_CPU_CACHE();
734 /* This shouldn't return. If it returns, we have a problem */
735 status
= acpi_enter_sleep_state(ACPI_STATE_S4
);
736 /* Reprogram control registers */
737 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
739 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
742 static void acpi_hibernation_leave(void)
744 pm_set_resume_via_firmware();
746 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
750 /* Reprogram control registers */
751 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
752 /* Check the hardware signature */
753 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
)
754 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
755 /* Restore the NVS memory area */
756 suspend_nvs_restore();
757 /* Allow EC transactions to happen. */
758 acpi_ec_unblock_transactions_early();
761 static void acpi_pm_thaw(void)
763 acpi_ec_unblock_transactions();
764 acpi_enable_all_runtime_gpes();
767 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
768 .begin
= acpi_hibernation_begin
,
770 .pre_snapshot
= acpi_pm_prepare
,
771 .finish
= acpi_pm_finish
,
772 .prepare
= acpi_pm_prepare
,
773 .enter
= acpi_hibernation_enter
,
774 .leave
= acpi_hibernation_leave
,
775 .pre_restore
= acpi_pm_freeze
,
776 .restore_cleanup
= acpi_pm_thaw
,
780 * acpi_hibernation_begin_old - Set the target system sleep state to
781 * ACPI_STATE_S4 and execute the _PTS control method. This
782 * function is used if the pre-ACPI 2.0 suspend ordering has been
785 static int acpi_hibernation_begin_old(void)
789 * The _TTS object should always be evaluated before the _PTS object.
790 * When the old_suspended_ordering is true, the _PTS object is
791 * evaluated in the acpi_sleep_prepare.
793 acpi_sleep_tts_switch(ACPI_STATE_S4
);
795 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
799 error
= suspend_nvs_alloc();
801 acpi_target_sleep_state
= ACPI_STATE_S4
;
802 acpi_scan_lock_acquire();
809 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
812 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
813 .begin
= acpi_hibernation_begin_old
,
815 .pre_snapshot
= acpi_pm_pre_suspend
,
816 .prepare
= acpi_pm_freeze
,
817 .finish
= acpi_pm_finish
,
818 .enter
= acpi_hibernation_enter
,
819 .leave
= acpi_hibernation_leave
,
820 .pre_restore
= acpi_pm_freeze
,
821 .restore_cleanup
= acpi_pm_thaw
,
822 .recover
= acpi_pm_finish
,
825 static void acpi_sleep_hibernate_setup(void)
827 if (!acpi_sleep_state_supported(ACPI_STATE_S4
))
830 hibernation_set_ops(old_suspend_ordering
?
831 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
832 sleep_states
[ACPI_STATE_S4
] = 1;
836 acpi_get_table(ACPI_SIG_FACS
, 1, (struct acpi_table_header
**)&facs
);
838 s4_hardware_signature
= facs
->hardware_signature
;
840 #else /* !CONFIG_HIBERNATION */
841 static inline void acpi_sleep_hibernate_setup(void) {}
842 #endif /* !CONFIG_HIBERNATION */
844 static void acpi_power_off_prepare(void)
846 /* Prepare to power off the system */
847 acpi_sleep_prepare(ACPI_STATE_S5
);
848 acpi_disable_all_gpes();
849 acpi_os_wait_events_complete();
852 static void acpi_power_off(void)
854 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
855 printk(KERN_DEBUG
"%s called\n", __func__
);
857 acpi_enter_sleep_state(ACPI_STATE_S5
);
860 int __init
acpi_sleep_init(void)
862 char supported
[ACPI_S_STATE_COUNT
* 3 + 1];
863 char *pos
= supported
;
866 acpi_sleep_dmi_check();
868 sleep_states
[ACPI_STATE_S0
] = 1;
870 acpi_sleep_suspend_setup();
871 acpi_sleep_hibernate_setup();
873 if (acpi_sleep_state_supported(ACPI_STATE_S5
)) {
874 sleep_states
[ACPI_STATE_S5
] = 1;
875 pm_power_off_prepare
= acpi_power_off_prepare
;
876 pm_power_off
= acpi_power_off
;
880 for (i
= 0; i
< ACPI_S_STATE_COUNT
; i
++) {
882 pos
+= sprintf(pos
, " S%d", i
);
884 pr_info(PREFIX
"(supports%s)\n", supported
);
887 * Register the tts_notifier to reboot notifier list so that the _TTS
888 * object can also be evaluated when the system enters S5.
890 register_reboot_notifier(&tts_notifier
);