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 bool acpi_sleep_no_lps0
;
165 static int __init
init_no_lps0(const struct dmi_system_id
*d
)
167 acpi_sleep_no_lps0
= true;
171 static struct dmi_system_id acpisleep_dmi_table
[] __initdata
= {
173 .callback
= init_old_suspend_ordering
,
174 .ident
= "Abit KN9 (nForce4 variant)",
176 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
177 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
181 .callback
= init_old_suspend_ordering
,
182 .ident
= "HP xw4600 Workstation",
184 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
185 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
189 .callback
= init_old_suspend_ordering
,
190 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
192 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
193 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
197 .callback
= init_old_suspend_ordering
,
198 .ident
= "Panasonic CF51-2L",
200 DMI_MATCH(DMI_BOARD_VENDOR
,
201 "Matsushita Electric Industrial Co.,Ltd."),
202 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
206 .callback
= init_nvs_nosave
,
207 .ident
= "Sony Vaio VGN-FW41E_H",
209 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW41E_H"),
214 .callback
= init_nvs_nosave
,
215 .ident
= "Sony Vaio VGN-FW21E",
217 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
222 .callback
= init_nvs_nosave
,
223 .ident
= "Sony Vaio VGN-FW21M",
225 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
226 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21M"),
230 .callback
= init_nvs_nosave
,
231 .ident
= "Sony Vaio VPCEB17FX",
233 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
234 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
238 .callback
= init_nvs_nosave
,
239 .ident
= "Sony Vaio VGN-SR11M",
241 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
242 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
246 .callback
= init_nvs_nosave
,
247 .ident
= "Everex StepNote Series",
249 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
250 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
254 .callback
= init_nvs_nosave
,
255 .ident
= "Sony Vaio VPCEB1Z1E",
257 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
262 .callback
= init_nvs_nosave
,
263 .ident
= "Sony Vaio VGN-NW130D",
265 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
270 .callback
= init_nvs_nosave
,
271 .ident
= "Sony Vaio VPCCW29FX",
273 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
274 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
278 .callback
= init_nvs_nosave
,
279 .ident
= "Averatec AV1020-ED2",
281 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
282 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
286 .callback
= init_old_suspend_ordering
,
287 .ident
= "Asus A8N-SLI DELUXE",
289 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
290 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
294 .callback
= init_old_suspend_ordering
,
295 .ident
= "Asus A8N-SLI Premium",
297 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
298 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
302 .callback
= init_nvs_nosave
,
303 .ident
= "Sony Vaio VGN-SR26GN_P",
305 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
306 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
310 .callback
= init_nvs_nosave
,
311 .ident
= "Sony Vaio VPCEB1S1E",
313 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1S1E"),
318 .callback
= init_nvs_nosave
,
319 .ident
= "Sony Vaio VGN-FW520F",
321 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
322 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
326 .callback
= init_nvs_nosave
,
327 .ident
= "Asus K54C",
329 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
334 .callback
= init_nvs_nosave
,
335 .ident
= "Asus K54HR",
337 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
338 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
342 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
343 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
347 .callback
= init_nvs_save_s3
,
348 .ident
= "Lenovo G50-45",
350 DMI_MATCH(DMI_SYS_VENDOR
, "LENOVO"),
351 DMI_MATCH(DMI_PRODUCT_NAME
, "80E3"),
355 * https://bugzilla.kernel.org/show_bug.cgi?id=196907
356 * Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
357 * S0 Idle firmware interface.
360 .callback
= init_no_lps0
,
361 .ident
= "Dell XPS13 9360",
363 DMI_MATCH(DMI_SYS_VENDOR
, "Dell Inc."),
364 DMI_MATCH(DMI_PRODUCT_NAME
, "XPS 13 9360"),
370 static void __init
acpi_sleep_dmi_check(void)
374 if (dmi_get_date(DMI_BIOS_DATE
, &year
, NULL
, NULL
) && year
>= 2012)
375 acpi_nvs_nosave_s3();
377 dmi_check_system(acpisleep_dmi_table
);
381 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
383 static int acpi_pm_freeze(void)
385 acpi_disable_all_gpes();
386 acpi_os_wait_events_complete();
387 acpi_ec_block_transactions();
392 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
394 static int acpi_pm_pre_suspend(void)
397 return suspend_nvs_save();
401 * __acpi_pm_prepare - Prepare the platform to enter the target state.
403 * If necessary, set the firmware waking vector and do arch-specific
404 * nastiness to get the wakeup code to the waking vector.
406 static int __acpi_pm_prepare(void)
408 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
410 acpi_target_sleep_state
= ACPI_STATE_S0
;
416 * acpi_pm_prepare - Prepare the platform to enter the target sleep
417 * state and disable the GPEs.
419 static int acpi_pm_prepare(void)
421 int error
= __acpi_pm_prepare();
423 error
= acpi_pm_pre_suspend();
428 static int find_powerf_dev(struct device
*dev
, void *data
)
430 struct acpi_device
*device
= to_acpi_device(dev
);
431 const char *hid
= acpi_device_hid(device
);
433 return !strcmp(hid
, ACPI_BUTTON_HID_POWERF
);
437 * acpi_pm_finish - Instruct the platform to leave a sleep state.
439 * This is called after we wake back up (or if entering the sleep state
442 static void acpi_pm_finish(void)
444 struct device
*pwr_btn_dev
;
445 u32 acpi_state
= acpi_target_sleep_state
;
447 acpi_ec_unblock_transactions();
450 if (acpi_state
== ACPI_STATE_S0
)
453 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
455 acpi_disable_wakeup_devices(acpi_state
);
456 acpi_leave_sleep_state(acpi_state
);
458 /* reset firmware waking vector */
459 acpi_set_waking_vector(0);
461 acpi_target_sleep_state
= ACPI_STATE_S0
;
463 acpi_resume_power_resources();
465 /* If we were woken with the fixed power button, provide a small
466 * hint to userspace in the form of a wakeup event on the fixed power
467 * button device (if it can be found).
469 * We delay the event generation til now, as the PM layer requires
470 * timekeeping to be running before we generate events. */
471 if (!pwr_btn_event_pending
)
474 pwr_btn_event_pending
= false;
475 pwr_btn_dev
= bus_find_device(&acpi_bus_type
, NULL
, NULL
,
478 pm_wakeup_event(pwr_btn_dev
, 0);
479 put_device(pwr_btn_dev
);
484 * acpi_pm_start - Start system PM transition.
486 static void acpi_pm_start(u32 acpi_state
)
488 acpi_target_sleep_state
= acpi_state
;
489 acpi_sleep_tts_switch(acpi_target_sleep_state
);
490 acpi_scan_lock_acquire();
494 * acpi_pm_end - Finish up system PM transition.
496 static void acpi_pm_end(void)
498 acpi_turn_off_unused_power_resources();
499 acpi_scan_lock_release();
501 * This is necessary in case acpi_pm_finish() is not called during a
502 * failing transition to a sleep state.
504 acpi_target_sleep_state
= ACPI_STATE_S0
;
505 acpi_sleep_tts_switch(acpi_target_sleep_state
);
507 #else /* !CONFIG_ACPI_SLEEP */
508 #define acpi_target_sleep_state ACPI_STATE_S0
509 #define acpi_sleep_no_lps0 (false)
510 static inline void acpi_sleep_dmi_check(void) {}
511 #endif /* CONFIG_ACPI_SLEEP */
513 #ifdef CONFIG_SUSPEND
514 static u32 acpi_suspend_states
[] = {
515 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
516 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
517 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
518 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
522 * acpi_suspend_begin - Set the target system sleep state to the state
523 * associated with given @pm_state, if supported.
525 static int acpi_suspend_begin(suspend_state_t pm_state
)
527 u32 acpi_state
= acpi_suspend_states
[pm_state
];
530 error
= (nvs_nosave
|| nvs_nosave_s3
) ? 0 : suspend_nvs_alloc();
534 if (!sleep_states
[acpi_state
]) {
535 pr_err("ACPI does not support sleep state S%u\n", acpi_state
);
538 if (acpi_state
> ACPI_STATE_S1
)
539 pm_set_suspend_via_firmware();
541 acpi_pm_start(acpi_state
);
546 * acpi_suspend_enter - Actually enter a sleep state.
549 * Flush caches and go to sleep. For STR we have to call arch-specific
550 * assembly, which in turn call acpi_enter_sleep_state().
551 * It's unfortunate, but it works. Please fix if you're feeling frisky.
553 static int acpi_suspend_enter(suspend_state_t pm_state
)
555 acpi_status status
= AE_OK
;
556 u32 acpi_state
= acpi_target_sleep_state
;
559 ACPI_FLUSH_CPU_CACHE();
561 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, true);
562 switch (acpi_state
) {
565 status
= acpi_enter_sleep_state(acpi_state
);
569 if (!acpi_suspend_lowlevel
)
571 error
= acpi_suspend_lowlevel();
574 pr_info(PREFIX
"Low-level resume complete\n");
575 pm_set_resume_via_firmware();
578 trace_suspend_resume(TPS("acpi_suspend"), acpi_state
, false);
580 /* This violates the spec but is required for bug compatibility. */
581 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
583 /* Reprogram control registers */
584 acpi_leave_sleep_state_prep(acpi_state
);
586 /* ACPI 3.0 specs (P62) says that it's the responsibility
587 * of the OSPM to clear the status bit [ implying that the
588 * POWER_BUTTON event should not reach userspace ]
590 * However, we do generate a small hint for userspace in the form of
591 * a wakeup event. We flag this condition for now and generate the
592 * event later, as we're currently too early in resume to be able to
593 * generate wakeup events.
595 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
)) {
596 acpi_event_status pwr_btn_status
= ACPI_EVENT_FLAG_DISABLED
;
598 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON
, &pwr_btn_status
);
600 if (pwr_btn_status
& ACPI_EVENT_FLAG_STATUS_SET
) {
601 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
603 pwr_btn_event_pending
= true;
608 * Disable and clear GPE status before interrupt is enabled. Some GPEs
609 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
610 * acpi_leave_sleep_state will reenable specific GPEs later
612 acpi_disable_all_gpes();
613 /* Allow EC transactions to happen. */
614 acpi_ec_unblock_transactions();
616 suspend_nvs_restore();
618 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
621 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
627 case PM_SUSPEND_STANDBY
:
629 acpi_state
= acpi_suspend_states
[pm_state
];
631 return sleep_states
[acpi_state
];
637 static const struct platform_suspend_ops acpi_suspend_ops
= {
638 .valid
= acpi_suspend_state_valid
,
639 .begin
= acpi_suspend_begin
,
640 .prepare_late
= acpi_pm_prepare
,
641 .enter
= acpi_suspend_enter
,
642 .wake
= acpi_pm_finish
,
647 * acpi_suspend_begin_old - Set the target system sleep state to the
648 * state associated with given @pm_state, if supported, and
649 * execute the _PTS control method. This function is used if the
650 * pre-ACPI 2.0 suspend ordering has been requested.
652 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
654 int error
= acpi_suspend_begin(pm_state
);
656 error
= __acpi_pm_prepare();
662 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
665 static const struct platform_suspend_ops acpi_suspend_ops_old
= {
666 .valid
= acpi_suspend_state_valid
,
667 .begin
= acpi_suspend_begin_old
,
668 .prepare_late
= acpi_pm_pre_suspend
,
669 .enter
= acpi_suspend_enter
,
670 .wake
= acpi_pm_finish
,
672 .recover
= acpi_pm_finish
,
675 static bool s2idle_in_progress
;
676 static bool s2idle_wakeup
;
679 * On platforms supporting the Low Power S0 Idle interface there is an ACPI
680 * device object with the PNP0D80 compatible device ID (System Power Management
681 * Controller) and a specific _DSM method under it. That method, if present,
682 * can be used to indicate to the platform that the OS is transitioning into a
683 * low-power state in which certain types of activity are not desirable or that
684 * it is leaving such a state, which allows the platform to adjust its operation
687 static const struct acpi_device_id lps0_device_ids
[] = {
692 #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
694 #define ACPI_LPS0_SCREEN_OFF 3
695 #define ACPI_LPS0_SCREEN_ON 4
696 #define ACPI_LPS0_ENTRY 5
697 #define ACPI_LPS0_EXIT 6
699 #define ACPI_S2IDLE_FUNC_MASK ((1 << ACPI_LPS0_ENTRY) | (1 << ACPI_LPS0_EXIT))
701 static acpi_handle lps0_device_handle
;
702 static guid_t lps0_dsm_guid
;
703 static char lps0_dsm_func_mask
;
705 static void acpi_sleep_run_lps0_dsm(unsigned int func
)
707 union acpi_object
*out_obj
;
709 if (!(lps0_dsm_func_mask
& (1 << func
)))
712 out_obj
= acpi_evaluate_dsm(lps0_device_handle
, &lps0_dsm_guid
, 1, func
, NULL
);
715 acpi_handle_debug(lps0_device_handle
, "_DSM function %u evaluation %s\n",
716 func
, out_obj
? "successful" : "failed");
719 static int lps0_device_attach(struct acpi_device
*adev
,
720 const struct acpi_device_id
*not_used
)
722 union acpi_object
*out_obj
;
724 if (lps0_device_handle
)
727 if (acpi_sleep_no_lps0
) {
728 acpi_handle_info(adev
->handle
,
729 "Low Power S0 Idle interface disabled\n");
733 if (!(acpi_gbl_FADT
.flags
& ACPI_FADT_LOW_POWER_S0
))
736 guid_parse(ACPI_LPS0_DSM_UUID
, &lps0_dsm_guid
);
737 /* Check if the _DSM is present and as expected. */
738 out_obj
= acpi_evaluate_dsm(adev
->handle
, &lps0_dsm_guid
, 1, 0, NULL
);
739 if (out_obj
&& out_obj
->type
== ACPI_TYPE_BUFFER
) {
740 char bitmask
= *(char *)out_obj
->buffer
.pointer
;
742 if ((bitmask
& ACPI_S2IDLE_FUNC_MASK
) == ACPI_S2IDLE_FUNC_MASK
) {
743 lps0_dsm_func_mask
= bitmask
;
744 lps0_device_handle
= adev
->handle
;
747 acpi_handle_debug(adev
->handle
, "_DSM function mask: 0x%x\n",
750 acpi_handle_debug(adev
->handle
,
751 "_DSM function 0 evaluation failed\n");
757 static struct acpi_scan_handler lps0_handler
= {
758 .ids
= lps0_device_ids
,
759 .attach
= lps0_device_attach
,
762 static int acpi_freeze_begin(void)
764 acpi_scan_lock_acquire();
765 s2idle_in_progress
= true;
769 static int acpi_freeze_prepare(void)
771 if (lps0_device_handle
) {
772 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF
);
773 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY
);
776 * The configuration of GPEs is changed here to avoid spurious
777 * wakeups, but that should not be necessary if this is a
778 * "low-power S0" platform and the low-power S0 _DSM is present.
780 acpi_enable_all_wakeup_gpes();
781 acpi_os_wait_events_complete();
783 if (acpi_sci_irq_valid())
784 enable_irq_wake(acpi_sci_irq
);
789 static void acpi_freeze_wake(void)
792 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
793 * that the SCI has triggered while suspended, so cancel the wakeup in
794 * case it has not been a wakeup event (the GPEs will be checked later).
796 if (acpi_sci_irq_valid() &&
797 !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq
))) {
798 pm_system_cancel_wakeup();
799 s2idle_wakeup
= true;
803 static void acpi_freeze_sync(void)
806 * Process all pending events in case there are any wakeup ones.
808 * The EC driver uses the system workqueue and an additional special
809 * one, so those need to be flushed too.
811 acpi_ec_flush_work();
812 acpi_os_wait_events_complete();
813 s2idle_wakeup
= false;
816 static void acpi_freeze_restore(void)
818 if (acpi_sci_irq_valid())
819 disable_irq_wake(acpi_sci_irq
);
821 if (lps0_device_handle
) {
822 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT
);
823 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON
);
825 acpi_enable_all_runtime_gpes();
829 static void acpi_freeze_end(void)
831 s2idle_in_progress
= false;
832 acpi_scan_lock_release();
835 static const struct platform_freeze_ops acpi_freeze_ops
= {
836 .begin
= acpi_freeze_begin
,
837 .prepare
= acpi_freeze_prepare
,
838 .wake
= acpi_freeze_wake
,
839 .sync
= acpi_freeze_sync
,
840 .restore
= acpi_freeze_restore
,
841 .end
= acpi_freeze_end
,
844 static void acpi_sleep_suspend_setup(void)
848 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++)
849 if (acpi_sleep_state_supported(i
))
852 suspend_set_ops(old_suspend_ordering
?
853 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
855 acpi_scan_add_handler(&lps0_handler
);
856 freeze_set_ops(&acpi_freeze_ops
);
859 #else /* !CONFIG_SUSPEND */
860 #define s2idle_in_progress (false)
861 #define s2idle_wakeup (false)
862 #define lps0_device_handle (NULL)
863 static inline void acpi_sleep_suspend_setup(void) {}
864 #endif /* !CONFIG_SUSPEND */
866 bool acpi_s2idle_wakeup(void)
868 return s2idle_wakeup
;
871 bool acpi_sleep_no_ec_events(void)
873 return !s2idle_in_progress
|| !lps0_device_handle
;
876 #ifdef CONFIG_PM_SLEEP
877 static u32 saved_bm_rld
;
879 static int acpi_save_bm_rld(void)
881 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &saved_bm_rld
);
885 static void acpi_restore_bm_rld(void)
887 u32 resumed_bm_rld
= 0;
889 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, &resumed_bm_rld
);
890 if (resumed_bm_rld
== saved_bm_rld
)
893 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD
, saved_bm_rld
);
896 static struct syscore_ops acpi_sleep_syscore_ops
= {
897 .suspend
= acpi_save_bm_rld
,
898 .resume
= acpi_restore_bm_rld
,
901 void acpi_sleep_syscore_init(void)
903 register_syscore_ops(&acpi_sleep_syscore_ops
);
906 static inline void acpi_sleep_syscore_init(void) {}
907 #endif /* CONFIG_PM_SLEEP */
909 #ifdef CONFIG_HIBERNATION
910 static unsigned long s4_hardware_signature
;
911 static struct acpi_table_facs
*facs
;
912 static bool nosigcheck
;
914 void __init
acpi_no_s4_hw_signature(void)
919 static int acpi_hibernation_begin(void)
923 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
925 acpi_pm_start(ACPI_STATE_S4
);
930 static int acpi_hibernation_enter(void)
932 acpi_status status
= AE_OK
;
934 ACPI_FLUSH_CPU_CACHE();
936 /* This shouldn't return. If it returns, we have a problem */
937 status
= acpi_enter_sleep_state(ACPI_STATE_S4
);
938 /* Reprogram control registers */
939 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
941 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
944 static void acpi_hibernation_leave(void)
946 pm_set_resume_via_firmware();
948 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
952 /* Reprogram control registers */
953 acpi_leave_sleep_state_prep(ACPI_STATE_S4
);
954 /* Check the hardware signature */
955 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
)
956 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
957 /* Restore the NVS memory area */
958 suspend_nvs_restore();
959 /* Allow EC transactions to happen. */
960 acpi_ec_unblock_transactions();
963 static void acpi_pm_thaw(void)
965 acpi_ec_unblock_transactions();
966 acpi_enable_all_runtime_gpes();
969 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
970 .begin
= acpi_hibernation_begin
,
972 .pre_snapshot
= acpi_pm_prepare
,
973 .finish
= acpi_pm_finish
,
974 .prepare
= acpi_pm_prepare
,
975 .enter
= acpi_hibernation_enter
,
976 .leave
= acpi_hibernation_leave
,
977 .pre_restore
= acpi_pm_freeze
,
978 .restore_cleanup
= acpi_pm_thaw
,
982 * acpi_hibernation_begin_old - Set the target system sleep state to
983 * ACPI_STATE_S4 and execute the _PTS control method. This
984 * function is used if the pre-ACPI 2.0 suspend ordering has been
987 static int acpi_hibernation_begin_old(void)
991 * The _TTS object should always be evaluated before the _PTS object.
992 * When the old_suspended_ordering is true, the _PTS object is
993 * evaluated in the acpi_sleep_prepare.
995 acpi_sleep_tts_switch(ACPI_STATE_S4
);
997 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
1001 error
= suspend_nvs_alloc();
1003 acpi_target_sleep_state
= ACPI_STATE_S4
;
1004 acpi_scan_lock_acquire();
1011 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1014 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
1015 .begin
= acpi_hibernation_begin_old
,
1017 .pre_snapshot
= acpi_pm_pre_suspend
,
1018 .prepare
= acpi_pm_freeze
,
1019 .finish
= acpi_pm_finish
,
1020 .enter
= acpi_hibernation_enter
,
1021 .leave
= acpi_hibernation_leave
,
1022 .pre_restore
= acpi_pm_freeze
,
1023 .restore_cleanup
= acpi_pm_thaw
,
1024 .recover
= acpi_pm_finish
,
1027 static void acpi_sleep_hibernate_setup(void)
1029 if (!acpi_sleep_state_supported(ACPI_STATE_S4
))
1032 hibernation_set_ops(old_suspend_ordering
?
1033 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
1034 sleep_states
[ACPI_STATE_S4
] = 1;
1038 acpi_get_table(ACPI_SIG_FACS
, 1, (struct acpi_table_header
**)&facs
);
1040 s4_hardware_signature
= facs
->hardware_signature
;
1042 #else /* !CONFIG_HIBERNATION */
1043 static inline void acpi_sleep_hibernate_setup(void) {}
1044 #endif /* !CONFIG_HIBERNATION */
1046 static void acpi_power_off_prepare(void)
1048 /* Prepare to power off the system */
1049 acpi_sleep_prepare(ACPI_STATE_S5
);
1050 acpi_disable_all_gpes();
1051 acpi_os_wait_events_complete();
1054 static void acpi_power_off(void)
1056 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1057 printk(KERN_DEBUG
"%s called\n", __func__
);
1058 local_irq_disable();
1059 acpi_enter_sleep_state(ACPI_STATE_S5
);
1062 int __init
acpi_sleep_init(void)
1064 char supported
[ACPI_S_STATE_COUNT
* 3 + 1];
1065 char *pos
= supported
;
1068 acpi_sleep_dmi_check();
1070 sleep_states
[ACPI_STATE_S0
] = 1;
1072 acpi_sleep_syscore_init();
1073 acpi_sleep_suspend_setup();
1074 acpi_sleep_hibernate_setup();
1076 if (acpi_sleep_state_supported(ACPI_STATE_S5
)) {
1077 sleep_states
[ACPI_STATE_S5
] = 1;
1078 pm_power_off_prepare
= acpi_power_off_prepare
;
1079 pm_power_off
= acpi_power_off
;
1085 for (i
= 0; i
< ACPI_S_STATE_COUNT
; i
++) {
1086 if (sleep_states
[i
])
1087 pos
+= sprintf(pos
, " S%d", i
);
1089 pr_info(PREFIX
"(supports%s)\n", supported
);
1092 * Register the tts_notifier to reboot notifier list so that the _TTS
1093 * object can also be evaluated when the system enters S5.
1095 register_reboot_notifier(&tts_notifier
);