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>
22 #include <linux/syscore_ops.h>
24 #include <trace/events/power.h>
30 * Some HW-full platforms do not have _S5, so they may need
31 * to leverage efi power off for a shutdown.
34 static u8 sleep_states
[ACPI_S_STATE_COUNT
];
36 static void acpi_sleep_tts_switch(u32 acpi_state
)
40 status
= acpi_execute_simple_method(NULL
, "\\_TTS", acpi_state
);
41 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
43 * OS can't evaluate the _TTS object correctly. Some warning
44 * message will be printed. But it won't break anything.
46 printk(KERN_NOTICE
"Failure in evaluating _TTS object\n");
50 static int tts_notify_reboot(struct notifier_block
*this,
51 unsigned long code
, void *x
)
53 acpi_sleep_tts_switch(ACPI_STATE_S5
);
57 static struct notifier_block tts_notifier
= {
58 .notifier_call
= tts_notify_reboot
,
63 static int acpi_sleep_prepare(u32 acpi_state
)
65 #ifdef CONFIG_ACPI_SLEEP
66 /* do we have a wakeup address for S2 and S3? */
67 if (acpi_state
== ACPI_STATE_S3
) {
68 if (!acpi_wakeup_address
)
70 acpi_set_waking_vector(acpi_wakeup_address
);
73 ACPI_FLUSH_CPU_CACHE();
75 printk(KERN_INFO PREFIX
"Preparing to enter system sleep state S%d\n",
77 acpi_enable_wakeup_devices(acpi_state
);
78 acpi_enter_sleep_state_prep(acpi_state
);
82 static bool acpi_sleep_state_supported(u8 sleep_state
)
87 status
= acpi_get_sleep_type_data(sleep_state
, &type_a
, &type_b
);
88 return ACPI_SUCCESS(status
) && (!acpi_gbl_reduced_hardware
89 || (acpi_gbl_FADT
.sleep_control
.address
90 && acpi_gbl_FADT
.sleep_status
.address
));
93 #ifdef CONFIG_ACPI_SLEEP
94 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
96 u32
acpi_target_system_state(void)
98 return acpi_target_sleep_state
;
100 EXPORT_SYMBOL_GPL(acpi_target_system_state
);
102 static bool pwr_btn_event_pending
;
105 * The ACPI specification wants us to save NVS memory regions during hibernation
106 * and to restore them during the subsequent resume. Windows does that also for
107 * suspend to RAM. However, it is known that this mechanism does not work on
108 * all machines, so we allow the user to disable it with the help of the
109 * 'acpi_sleep=nonvs' kernel command line option.
111 static bool nvs_nosave
;
113 void __init
acpi_nvs_nosave(void)
119 * The ACPI specification wants us to save NVS memory regions during hibernation
120 * but says nothing about saving NVS during S3. Not all versions of Windows
121 * save NVS on S3 suspend either, and it is clear that not all systems need
122 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
123 * user to disable saving NVS on S3 if their system does not require it, but
124 * continue to save/restore NVS for S4 as specified.
126 static bool nvs_nosave_s3
;
128 void __init
acpi_nvs_nosave_s3(void)
130 nvs_nosave_s3
= true;
133 static int __init
init_nvs_save_s3(const struct dmi_system_id
*d
)
135 nvs_nosave_s3
= false;
140 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
141 * user to request that behavior by using the 'acpi_old_suspend_ordering'
142 * kernel command line option that causes the following variable to be set.
144 static bool old_suspend_ordering
;
146 void __init
acpi_old_suspend_ordering(void)
148 old_suspend_ordering
= true;
151 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
153 acpi_old_suspend_ordering();
157 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
163 static struct dmi_system_id acpisleep_dmi_table
[] __initdata
= {
165 .callback
= init_old_suspend_ordering
,
166 .ident
= "Abit KN9 (nForce4 variant)",
168 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
169 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
173 .callback
= init_old_suspend_ordering
,
174 .ident
= "HP xw4600 Workstation",
176 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
177 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
181 .callback
= init_old_suspend_ordering
,
182 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
184 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
185 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
189 .callback
= init_old_suspend_ordering
,
190 .ident
= "Panasonic CF51-2L",
192 DMI_MATCH(DMI_BOARD_VENDOR
,
193 "Matsushita Electric Industrial Co.,Ltd."),
194 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
198 .callback
= init_nvs_nosave
,
199 .ident
= "Sony Vaio VGN-FW41E_H",
201 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
202 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW41E_H"),
206 .callback
= init_nvs_nosave
,
207 .ident
= "Sony Vaio VGN-FW21E",
209 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
214 .callback
= init_nvs_nosave
,
215 .ident
= "Sony Vaio VGN-FW21M",
217 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21M"),
222 .callback
= init_nvs_nosave
,
223 .ident
= "Sony Vaio VPCEB17FX",
225 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
226 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
230 .callback
= init_nvs_nosave
,
231 .ident
= "Sony Vaio VGN-SR11M",
233 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
234 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
238 .callback
= init_nvs_nosave
,
239 .ident
= "Everex StepNote Series",
241 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
242 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
246 .callback
= init_nvs_nosave
,
247 .ident
= "Sony Vaio VPCEB1Z1E",
249 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
250 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
254 .callback
= init_nvs_nosave
,
255 .ident
= "Sony Vaio VGN-NW130D",
257 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
262 .callback
= init_nvs_nosave
,
263 .ident
= "Sony Vaio VPCCW29FX",
265 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
270 .callback
= init_nvs_nosave
,
271 .ident
= "Averatec AV1020-ED2",
273 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
274 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
278 .callback
= init_old_suspend_ordering
,
279 .ident
= "Asus A8N-SLI DELUXE",
281 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
282 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
286 .callback
= init_old_suspend_ordering
,
287 .ident
= "Asus A8N-SLI Premium",
289 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
290 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
294 .callback
= init_nvs_nosave
,
295 .ident
= "Sony Vaio VGN-SR26GN_P",
297 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
298 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
302 .callback
= init_nvs_nosave
,
303 .ident
= "Sony Vaio VPCEB1S1E",
305 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
306 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1S1E"),
310 .callback
= init_nvs_nosave
,
311 .ident
= "Sony Vaio VGN-FW520F",
313 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
318 .callback
= init_nvs_nosave
,
319 .ident
= "Asus K54C",
321 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
322 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
326 .callback
= init_nvs_nosave
,
327 .ident
= "Asus K54HR",
329 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
334 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
335 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
339 .callback
= init_nvs_save_s3
,
340 .ident
= "Lenovo G50-45",
342 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
343 DMI_MATCH(DMI_PRODUCT_NAME
, "80E3"),
349 static void __init
acpi_sleep_dmi_check(void)
353 if (dmi_get_date(DMI_BIOS_DATE
, &year
, NULL
, NULL
) && year
>= 2012)
354 acpi_nvs_nosave_s3();
356 dmi_check_system(acpisleep_dmi_table
);
360 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
362 static int acpi_pm_freeze(void)
364 acpi_disable_all_gpes();
365 acpi_os_wait_events_complete();
366 acpi_ec_block_transactions();
371 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
373 static int acpi_pm_pre_suspend(void)
376 return suspend_nvs_save();
380 * __acpi_pm_prepare - Prepare the platform to enter the target state.
382 * If necessary, set the firmware waking vector and do arch-specific
383 * nastiness to get the wakeup code to the waking vector.
385 static int __acpi_pm_prepare(void)
387 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
389 acpi_target_sleep_state
= ACPI_STATE_S0
;
395 * acpi_pm_prepare - Prepare the platform to enter the target sleep
396 * state and disable the GPEs.
398 static int acpi_pm_prepare(void)
400 int error
= __acpi_pm_prepare();
402 error
= acpi_pm_pre_suspend();
407 static int find_powerf_dev(struct device
*dev
, void *data
)
409 struct acpi_device
*device
= to_acpi_device(dev
);
410 const char *hid
= acpi_device_hid(device
);
412 return !strcmp(hid
, ACPI_BUTTON_HID_POWERF
);
416 * acpi_pm_finish - Instruct the platform to leave a sleep state.
418 * This is called after we wake back up (or if entering the sleep state
421 static void acpi_pm_finish(void)
423 struct device
*pwr_btn_dev
;
424 u32 acpi_state
= acpi_target_sleep_state
;
426 acpi_ec_unblock_transactions();
429 if (acpi_state
== ACPI_STATE_S0
)
432 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
434 acpi_disable_wakeup_devices(acpi_state
);
435 acpi_leave_sleep_state(acpi_state
);
437 /* reset firmware waking vector */
438 acpi_set_waking_vector(0);
440 acpi_target_sleep_state
= ACPI_STATE_S0
;
442 acpi_resume_power_resources();
444 /* If we were woken with the fixed power button, provide a small
445 * hint to userspace in the form of a wakeup event on the fixed power
446 * button device (if it can be found).
448 * We delay the event generation til now, as the PM layer requires
449 * timekeeping to be running before we generate events. */
450 if (!pwr_btn_event_pending
)
453 pwr_btn_event_pending
= false;
454 pwr_btn_dev
= bus_find_device(&acpi_bus_type
, NULL
, NULL
,
457 pm_wakeup_event(pwr_btn_dev
, 0);
458 put_device(pwr_btn_dev
);
463 * acpi_pm_start - Start system PM transition.
465 static void acpi_pm_start(u32 acpi_state
)
467 acpi_target_sleep_state
= acpi_state
;
468 acpi_sleep_tts_switch(acpi_target_sleep_state
);
469 acpi_scan_lock_acquire();
473 * acpi_pm_end - Finish up system PM transition.
475 static void acpi_pm_end(void)
477 acpi_turn_off_unused_power_resources();
478 acpi_scan_lock_release();
480 * This is necessary in case acpi_pm_finish() is not called during a
481 * failing transition to a sleep state.
483 acpi_target_sleep_state
= ACPI_STATE_S0
;
484 acpi_sleep_tts_switch(acpi_target_sleep_state
);
486 #else /* !CONFIG_ACPI_SLEEP */
487 #define acpi_target_sleep_state ACPI_STATE_S0
488 static inline void acpi_sleep_dmi_check(void) {}
489 #endif /* CONFIG_ACPI_SLEEP */
491 #ifdef CONFIG_SUSPEND
492 static u32 acpi_suspend_states
[] = {
493 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
494 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
495 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
496 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
500 * acpi_suspend_begin - Set the target system sleep state to the state
501 * associated with given @pm_state, if supported.
503 static int acpi_suspend_begin(suspend_state_t pm_state
)
505 u32 acpi_state
= acpi_suspend_states
[pm_state
];
508 error
= (nvs_nosave
|| nvs_nosave_s3
) ? 0 : suspend_nvs_alloc();
512 if (!sleep_states
[acpi_state
]) {
513 pr_err("ACPI does not support sleep state S%u\n", acpi_state
);
516 if (acpi_state
> ACPI_STATE_S1
)
517 pm_set_suspend_via_firmware();
519 acpi_pm_start(acpi_state
);
524 * acpi_suspend_enter - Actually enter a sleep state.
527 * Flush caches and go to sleep. For STR we have to call arch-specific
528 * assembly, which in turn call acpi_enter_sleep_state().
529 * It's unfortunate, but it works. Please fix if you're feeling frisky.
531 static int acpi_suspend_enter(suspend_state_t pm_state
)
533 acpi_status status
= AE_OK
;
534 u32 acpi_state
= acpi_target_sleep_state
;
537 ACPI_FLUSH_CPU_CACHE();
539 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, true);
540 switch (acpi_state
) {
543 status
= acpi_enter_sleep_state(acpi_state
);
547 if (!acpi_suspend_lowlevel
)
549 error
= acpi_suspend_lowlevel();
552 pr_info(PREFIX
"Low-level resume complete\n");
553 pm_set_resume_via_firmware();
556 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, false);
558 /* This violates the spec but is required for bug compatibility. */
559 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
561 /* Reprogram control registers */
562 acpi_leave_sleep_state_prep(acpi_state
);
564 /* ACPI 3.0 specs (P62) says that it's the responsibility
565 * of the OSPM to clear the status bit [ implying that the
566 * POWER_BUTTON event should not reach userspace ]
568 * However, we do generate a small hint for userspace in the form of
569 * a wakeup event. We flag this condition for now and generate the
570 * event later, as we're currently too early in resume to be able to
571 * generate wakeup events.
573 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
)) {
574 acpi_event_status pwr_btn_status
= ACPI_EVENT_FLAG_DISABLED
;
576 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON
, &pwr_btn_status
);
578 if (pwr_btn_status
& ACPI_EVENT_FLAG_STATUS_SET
) {
579 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
581 pwr_btn_event_pending
= true;
586 * Disable and clear GPE status before interrupt is enabled. Some GPEs
587 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
588 * acpi_leave_sleep_state will reenable specific GPEs later
590 acpi_disable_all_gpes();
591 /* Allow EC transactions to happen. */
592 acpi_ec_unblock_transactions();
594 suspend_nvs_restore();
596 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
599 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
605 case PM_SUSPEND_STANDBY
:
607 acpi_state
= acpi_suspend_states
[pm_state
];
609 return sleep_states
[acpi_state
];
615 static const struct platform_suspend_ops acpi_suspend_ops
= {
616 .valid
= acpi_suspend_state_valid
,
617 .begin
= acpi_suspend_begin
,
618 .prepare_late
= acpi_pm_prepare
,
619 .enter
= acpi_suspend_enter
,
620 .wake
= acpi_pm_finish
,
625 * acpi_suspend_begin_old - Set the target system sleep state to the
626 * state associated with given @pm_state, if supported, and
627 * execute the _PTS control method. This function is used if the
628 * pre-ACPI 2.0 suspend ordering has been requested.
630 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
632 int error
= acpi_suspend_begin(pm_state
);
634 error
= __acpi_pm_prepare();
640 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
643 static const struct platform_suspend_ops acpi_suspend_ops_old
= {
644 .valid
= acpi_suspend_state_valid
,
645 .begin
= acpi_suspend_begin_old
,
646 .prepare_late
= acpi_pm_pre_suspend
,
647 .enter
= acpi_suspend_enter
,
648 .wake
= acpi_pm_finish
,
650 .recover
= acpi_pm_finish
,
653 static int acpi_freeze_begin(void)
655 acpi_scan_lock_acquire();
659 static int acpi_freeze_prepare(void)
661 acpi_enable_wakeup_devices(ACPI_STATE_S0
);
662 acpi_enable_all_wakeup_gpes();
663 acpi_os_wait_events_complete();
664 if (acpi_sci_irq_valid())
665 enable_irq_wake(acpi_sci_irq
);
670 static void acpi_freeze_wake(void)
673 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
674 * that the SCI has triggered while suspended, so cancel the wakeup in
675 * case it has not been a wakeup event (the GPEs will be checked later).
677 if (acpi_sci_irq_valid() &&
678 !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq
)))
679 pm_system_cancel_wakeup();
682 static void acpi_freeze_sync(void)
685 * Process all pending events in case there are any wakeup ones.
687 * The EC driver uses the system workqueue, so that one needs to be
690 acpi_os_wait_events_complete();
691 flush_scheduled_work();
694 static void acpi_freeze_restore(void)
696 acpi_disable_wakeup_devices(ACPI_STATE_S0
);
697 if (acpi_sci_irq_valid())
698 disable_irq_wake(acpi_sci_irq
);
700 acpi_enable_all_runtime_gpes();
703 static void acpi_freeze_end(void)
705 acpi_scan_lock_release();
708 static const struct platform_freeze_ops acpi_freeze_ops
= {
709 .begin
= acpi_freeze_begin
,
710 .prepare
= acpi_freeze_prepare
,
711 .wake
= acpi_freeze_wake
,
712 .sync
= acpi_freeze_sync
,
713 .restore
= acpi_freeze_restore
,
714 .end
= acpi_freeze_end
,
717 static void acpi_sleep_suspend_setup(void)
721 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++)
722 if (acpi_sleep_state_supported(i
))
725 suspend_set_ops(old_suspend_ordering
?
726 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
727 freeze_set_ops(&acpi_freeze_ops
);
730 #else /* !CONFIG_SUSPEND */
731 static inline void acpi_sleep_suspend_setup(void) {}
732 #endif /* !CONFIG_SUSPEND */
734 #ifdef CONFIG_PM_SLEEP
735 static u32 saved_bm_rld
;
737 static int acpi_save_bm_rld(void)
739 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &saved_bm_rld
);
743 static void acpi_restore_bm_rld(void)
745 u32 resumed_bm_rld
= 0;
747 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &resumed_bm_rld
);
748 if (resumed_bm_rld
== saved_bm_rld
)
751 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, saved_bm_rld
);
754 static struct syscore_ops acpi_sleep_syscore_ops
= {
755 .suspend
= acpi_save_bm_rld
,
756 .resume
= acpi_restore_bm_rld
,
759 void acpi_sleep_syscore_init(void)
761 register_syscore_ops(&acpi_sleep_syscore_ops
);
764 static inline void acpi_sleep_syscore_init(void) {}
765 #endif /* CONFIG_PM_SLEEP */
767 #ifdef CONFIG_HIBERNATION
768 static unsigned long s4_hardware_signature
;
769 static struct acpi_table_facs
*facs
;
770 static bool nosigcheck
;
772 void __init
acpi_no_s4_hw_signature(void)
777 static int acpi_hibernation_begin(void)
781 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
783 acpi_pm_start(ACPI_STATE_S4
);
788 static int acpi_hibernation_enter(void)
790 acpi_status status
= AE_OK
;
792 ACPI_FLUSH_CPU_CACHE();
794 /* This shouldn't return. If it returns, we have a problem */
795 status
= acpi_enter_sleep_state(ACPI_STATE_S4
);
796 /* Reprogram control registers */
797 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
799 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
802 static void acpi_hibernation_leave(void)
804 pm_set_resume_via_firmware();
806 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
810 /* Reprogram control registers */
811 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
812 /* Check the hardware signature */
813 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
)
814 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
815 /* Restore the NVS memory area */
816 suspend_nvs_restore();
817 /* Allow EC transactions to happen. */
818 acpi_ec_unblock_transactions();
821 static void acpi_pm_thaw(void)
823 acpi_ec_unblock_transactions();
824 acpi_enable_all_runtime_gpes();
827 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
828 .begin
= acpi_hibernation_begin
,
830 .pre_snapshot
= acpi_pm_prepare
,
831 .finish
= acpi_pm_finish
,
832 .prepare
= acpi_pm_prepare
,
833 .enter
= acpi_hibernation_enter
,
834 .leave
= acpi_hibernation_leave
,
835 .pre_restore
= acpi_pm_freeze
,
836 .restore_cleanup
= acpi_pm_thaw
,
840 * acpi_hibernation_begin_old - Set the target system sleep state to
841 * ACPI_STATE_S4 and execute the _PTS control method. This
842 * function is used if the pre-ACPI 2.0 suspend ordering has been
845 static int acpi_hibernation_begin_old(void)
849 * The _TTS object should always be evaluated before the _PTS object.
850 * When the old_suspended_ordering is true, the _PTS object is
851 * evaluated in the acpi_sleep_prepare.
853 acpi_sleep_tts_switch(ACPI_STATE_S4
);
855 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
859 error
= suspend_nvs_alloc();
861 acpi_target_sleep_state
= ACPI_STATE_S4
;
862 acpi_scan_lock_acquire();
869 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
872 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
873 .begin
= acpi_hibernation_begin_old
,
875 .pre_snapshot
= acpi_pm_pre_suspend
,
876 .prepare
= acpi_pm_freeze
,
877 .finish
= acpi_pm_finish
,
878 .enter
= acpi_hibernation_enter
,
879 .leave
= acpi_hibernation_leave
,
880 .pre_restore
= acpi_pm_freeze
,
881 .restore_cleanup
= acpi_pm_thaw
,
882 .recover
= acpi_pm_finish
,
885 static void acpi_sleep_hibernate_setup(void)
887 if (!acpi_sleep_state_supported(ACPI_STATE_S4
))
890 hibernation_set_ops(old_suspend_ordering
?
891 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
892 sleep_states
[ACPI_STATE_S4
] = 1;
896 acpi_get_table(ACPI_SIG_FACS
, 1, (struct acpi_table_header
**)&facs
);
898 s4_hardware_signature
= facs
->hardware_signature
;
900 #else /* !CONFIG_HIBERNATION */
901 static inline void acpi_sleep_hibernate_setup(void) {}
902 #endif /* !CONFIG_HIBERNATION */
904 static void acpi_power_off_prepare(void)
906 /* Prepare to power off the system */
907 acpi_sleep_prepare(ACPI_STATE_S5
);
908 acpi_disable_all_gpes();
909 acpi_os_wait_events_complete();
912 static void acpi_power_off(void)
914 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
915 printk(KERN_DEBUG
"%s called\n", __func__
);
917 acpi_enter_sleep_state(ACPI_STATE_S5
);
920 int __init
acpi_sleep_init(void)
922 char supported
[ACPI_S_STATE_COUNT
* 3 + 1];
923 char *pos
= supported
;
926 acpi_sleep_dmi_check();
928 sleep_states
[ACPI_STATE_S0
] = 1;
930 acpi_sleep_syscore_init();
931 acpi_sleep_suspend_setup();
932 acpi_sleep_hibernate_setup();
934 if (acpi_sleep_state_supported(ACPI_STATE_S5
)) {
935 sleep_states
[ACPI_STATE_S5
] = 1;
936 pm_power_off_prepare
= acpi_power_off_prepare
;
937 pm_power_off
= acpi_power_off
;
943 for (i
= 0; i
< ACPI_S_STATE_COUNT
; i
++) {
945 pos
+= sprintf(pos
, " S%d", i
);
947 pr_info(PREFIX
"(supports%s)\n", supported
);
950 * Register the tts_notifier to reboot notifier list so that the _TTS
951 * object can also be evaluated when the system enters S5.
953 register_reboot_notifier(&tts_notifier
);