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>
21 #include <linux/pm_runtime.h>
25 #include <acpi/acpi_bus.h>
26 #include <acpi/acpi_drivers.h>
31 u8 wake_sleep_flags
= ACPI_NO_OPTIONAL_METHODS
;
32 static unsigned int gts
, bfs
;
33 static int set_param_wake_flag(const char *val
, struct kernel_param
*kp
)
35 int ret
= param_set_int(val
, kp
);
40 if (kp
->arg
== (const char *)>s
) {
42 wake_sleep_flags
|= ACPI_EXECUTE_GTS
;
44 wake_sleep_flags
&= ~ACPI_EXECUTE_GTS
;
46 if (kp
->arg
== (const char *)&bfs
) {
48 wake_sleep_flags
|= ACPI_EXECUTE_BFS
;
50 wake_sleep_flags
&= ~ACPI_EXECUTE_BFS
;
54 module_param_call(gts
, set_param_wake_flag
, param_get_int
, >s
, 0644);
55 module_param_call(bfs
, set_param_wake_flag
, param_get_int
, &bfs
, 0644);
56 MODULE_PARM_DESC(gts
, "Enable evaluation of _GTS on suspend.");
57 MODULE_PARM_DESC(bfs
, "Enable evaluation of _BFS on resume".);
59 static u8 sleep_states
[ACPI_S_STATE_COUNT
];
60 static bool pwr_btn_event_pending
;
62 static void acpi_sleep_tts_switch(u32 acpi_state
)
64 union acpi_object in_arg
= { ACPI_TYPE_INTEGER
};
65 struct acpi_object_list arg_list
= { 1, &in_arg
};
66 acpi_status status
= AE_OK
;
68 in_arg
.integer
.value
= acpi_state
;
69 status
= acpi_evaluate_object(NULL
, "\\_TTS", &arg_list
, NULL
);
70 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
72 * OS can't evaluate the _TTS object correctly. Some warning
73 * message will be printed. But it won't break anything.
75 printk(KERN_NOTICE
"Failure in evaluating _TTS object\n");
79 static int tts_notify_reboot(struct notifier_block
*this,
80 unsigned long code
, void *x
)
82 acpi_sleep_tts_switch(ACPI_STATE_S5
);
86 static struct notifier_block tts_notifier
= {
87 .notifier_call
= tts_notify_reboot
,
92 static int acpi_sleep_prepare(u32 acpi_state
)
94 #ifdef CONFIG_ACPI_SLEEP
95 /* do we have a wakeup address for S2 and S3? */
96 if (acpi_state
== ACPI_STATE_S3
) {
97 if (!acpi_wakeup_address
)
99 acpi_set_firmware_waking_vector(acpi_wakeup_address
);
102 ACPI_FLUSH_CPU_CACHE();
104 printk(KERN_INFO PREFIX
"Preparing to enter system sleep state S%d\n",
106 acpi_enable_wakeup_devices(acpi_state
);
107 acpi_enter_sleep_state_prep(acpi_state
);
111 #ifdef CONFIG_ACPI_SLEEP
112 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
115 * The ACPI specification wants us to save NVS memory regions during hibernation
116 * and to restore them during the subsequent resume. Windows does that also for
117 * suspend to RAM. However, it is known that this mechanism does not work on
118 * all machines, so we allow the user to disable it with the help of the
119 * 'acpi_sleep=nonvs' kernel command line option.
121 static bool nvs_nosave
;
123 void __init
acpi_nvs_nosave(void)
129 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
130 * user to request that behavior by using the 'acpi_old_suspend_ordering'
131 * kernel command line option that causes the following variable to be set.
133 static bool old_suspend_ordering
;
135 void __init
acpi_old_suspend_ordering(void)
137 old_suspend_ordering
= true;
141 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
143 static int acpi_pm_freeze(void)
145 acpi_disable_all_gpes();
146 acpi_os_wait_events_complete(NULL
);
147 acpi_ec_block_transactions();
152 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
154 static int acpi_pm_pre_suspend(void)
157 return suspend_nvs_save();
161 * __acpi_pm_prepare - Prepare the platform to enter the target state.
163 * If necessary, set the firmware waking vector and do arch-specific
164 * nastiness to get the wakeup code to the waking vector.
166 static int __acpi_pm_prepare(void)
168 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
170 acpi_target_sleep_state
= ACPI_STATE_S0
;
176 * acpi_pm_prepare - Prepare the platform to enter the target sleep
177 * state and disable the GPEs.
179 static int acpi_pm_prepare(void)
181 int error
= __acpi_pm_prepare();
183 error
= acpi_pm_pre_suspend();
188 static int find_powerf_dev(struct device
*dev
, void *data
)
190 struct acpi_device
*device
= to_acpi_device(dev
);
191 const char *hid
= acpi_device_hid(device
);
193 return !strcmp(hid
, ACPI_BUTTON_HID_POWERF
);
197 * acpi_pm_finish - Instruct the platform to leave a sleep state.
199 * This is called after we wake back up (or if entering the sleep state
202 static void acpi_pm_finish(void)
204 struct device
*pwr_btn_dev
;
205 u32 acpi_state
= acpi_target_sleep_state
;
207 acpi_ec_unblock_transactions();
210 if (acpi_state
== ACPI_STATE_S0
)
213 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
215 acpi_disable_wakeup_devices(acpi_state
);
216 acpi_leave_sleep_state(acpi_state
);
218 /* reset firmware waking vector */
219 acpi_set_firmware_waking_vector((acpi_physical_address
) 0);
221 acpi_target_sleep_state
= ACPI_STATE_S0
;
223 /* If we were woken with the fixed power button, provide a small
224 * hint to userspace in the form of a wakeup event on the fixed power
225 * button device (if it can be found).
227 * We delay the event generation til now, as the PM layer requires
228 * timekeeping to be running before we generate events. */
229 if (!pwr_btn_event_pending
)
232 pwr_btn_event_pending
= false;
233 pwr_btn_dev
= bus_find_device(&acpi_bus_type
, NULL
, NULL
,
236 pm_wakeup_event(pwr_btn_dev
, 0);
237 put_device(pwr_btn_dev
);
242 * acpi_pm_end - Finish up suspend sequence.
244 static void acpi_pm_end(void)
247 * This is necessary in case acpi_pm_finish() is not called during a
248 * failing transition to a sleep state.
250 acpi_target_sleep_state
= ACPI_STATE_S0
;
251 acpi_sleep_tts_switch(acpi_target_sleep_state
);
253 #else /* !CONFIG_ACPI_SLEEP */
254 #define acpi_target_sleep_state ACPI_STATE_S0
255 #endif /* CONFIG_ACPI_SLEEP */
257 #ifdef CONFIG_SUSPEND
258 static u32 acpi_suspend_states
[] = {
259 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
260 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
261 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
262 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
266 * acpi_suspend_begin - Set the target system sleep state to the state
267 * associated with given @pm_state, if supported.
269 static int acpi_suspend_begin(suspend_state_t pm_state
)
271 u32 acpi_state
= acpi_suspend_states
[pm_state
];
274 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
278 if (sleep_states
[acpi_state
]) {
279 acpi_target_sleep_state
= acpi_state
;
280 acpi_sleep_tts_switch(acpi_target_sleep_state
);
282 printk(KERN_ERR
"ACPI does not support this state: %d\n",
290 * acpi_suspend_enter - Actually enter a sleep state.
293 * Flush caches and go to sleep. For STR we have to call arch-specific
294 * assembly, which in turn call acpi_enter_sleep_state().
295 * It's unfortunate, but it works. Please fix if you're feeling frisky.
297 static int acpi_suspend_enter(suspend_state_t pm_state
)
299 acpi_status status
= AE_OK
;
300 u32 acpi_state
= acpi_target_sleep_state
;
303 ACPI_FLUSH_CPU_CACHE();
305 switch (acpi_state
) {
308 status
= acpi_enter_sleep_state(acpi_state
, wake_sleep_flags
);
312 error
= acpi_suspend_lowlevel();
315 pr_info(PREFIX
"Low-level resume complete\n");
319 /* This violates the spec but is required for bug compatibility. */
320 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
322 /* Reprogram control registers and execute _BFS */
323 acpi_leave_sleep_state_prep(acpi_state
, wake_sleep_flags
);
325 /* ACPI 3.0 specs (P62) says that it's the responsibility
326 * of the OSPM to clear the status bit [ implying that the
327 * POWER_BUTTON event should not reach userspace ]
329 * However, we do generate a small hint for userspace in the form of
330 * a wakeup event. We flag this condition for now and generate the
331 * event later, as we're currently too early in resume to be able to
332 * generate wakeup events.
334 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
)) {
335 acpi_event_status pwr_btn_status
;
337 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON
, &pwr_btn_status
);
339 if (pwr_btn_status
& ACPI_EVENT_FLAG_SET
) {
340 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
342 pwr_btn_event_pending
= true;
347 * Disable and clear GPE status before interrupt is enabled. Some GPEs
348 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
349 * acpi_leave_sleep_state will reenable specific GPEs later
351 acpi_disable_all_gpes();
352 /* Allow EC transactions to happen. */
353 acpi_ec_unblock_transactions_early();
355 suspend_nvs_restore();
357 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
360 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
366 case PM_SUSPEND_STANDBY
:
368 acpi_state
= acpi_suspend_states
[pm_state
];
370 return sleep_states
[acpi_state
];
376 static const struct platform_suspend_ops acpi_suspend_ops
= {
377 .valid
= acpi_suspend_state_valid
,
378 .begin
= acpi_suspend_begin
,
379 .prepare_late
= acpi_pm_prepare
,
380 .enter
= acpi_suspend_enter
,
381 .wake
= acpi_pm_finish
,
386 * acpi_suspend_begin_old - Set the target system sleep state to the
387 * state associated with given @pm_state, if supported, and
388 * execute the _PTS control method. This function is used if the
389 * pre-ACPI 2.0 suspend ordering has been requested.
391 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
393 int error
= acpi_suspend_begin(pm_state
);
395 error
= __acpi_pm_prepare();
401 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
404 static const struct platform_suspend_ops acpi_suspend_ops_old
= {
405 .valid
= acpi_suspend_state_valid
,
406 .begin
= acpi_suspend_begin_old
,
407 .prepare_late
= acpi_pm_pre_suspend
,
408 .enter
= acpi_suspend_enter
,
409 .wake
= acpi_pm_finish
,
411 .recover
= acpi_pm_finish
,
414 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
416 old_suspend_ordering
= true;
420 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
426 static struct dmi_system_id __initdata acpisleep_dmi_table
[] = {
428 .callback
= init_old_suspend_ordering
,
429 .ident
= "Abit KN9 (nForce4 variant)",
431 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
432 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
436 .callback
= init_old_suspend_ordering
,
437 .ident
= "HP xw4600 Workstation",
439 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
440 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
444 .callback
= init_old_suspend_ordering
,
445 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
447 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
448 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
452 .callback
= init_old_suspend_ordering
,
453 .ident
= "Panasonic CF51-2L",
455 DMI_MATCH(DMI_BOARD_VENDOR
,
456 "Matsushita Electric Industrial Co.,Ltd."),
457 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
461 .callback
= init_nvs_nosave
,
462 .ident
= "Sony Vaio VGN-FW21E",
464 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
465 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
469 .callback
= init_nvs_nosave
,
470 .ident
= "Sony Vaio VPCEB17FX",
472 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
473 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
477 .callback
= init_nvs_nosave
,
478 .ident
= "Sony Vaio VGN-SR11M",
480 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
481 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
485 .callback
= init_nvs_nosave
,
486 .ident
= "Everex StepNote Series",
488 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
489 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
493 .callback
= init_nvs_nosave
,
494 .ident
= "Sony Vaio VPCEB1Z1E",
496 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
497 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
501 .callback
= init_nvs_nosave
,
502 .ident
= "Sony Vaio VGN-NW130D",
504 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
505 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
509 .callback
= init_nvs_nosave
,
510 .ident
= "Sony Vaio VPCCW29FX",
512 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
513 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
517 .callback
= init_nvs_nosave
,
518 .ident
= "Averatec AV1020-ED2",
520 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
521 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
525 .callback
= init_old_suspend_ordering
,
526 .ident
= "Asus A8N-SLI DELUXE",
528 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
529 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
533 .callback
= init_old_suspend_ordering
,
534 .ident
= "Asus A8N-SLI Premium",
536 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
537 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
541 .callback
= init_nvs_nosave
,
542 .ident
= "Sony Vaio VGN-SR26GN_P",
544 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
545 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
549 .callback
= init_nvs_nosave
,
550 .ident
= "Sony Vaio VGN-FW520F",
552 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
553 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
557 .callback
= init_nvs_nosave
,
558 .ident
= "Asus K54C",
560 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
561 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
565 .callback
= init_nvs_nosave
,
566 .ident
= "Asus K54HR",
568 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
569 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
574 #endif /* CONFIG_SUSPEND */
576 #ifdef CONFIG_HIBERNATION
577 static unsigned long s4_hardware_signature
;
578 static struct acpi_table_facs
*facs
;
579 static bool nosigcheck
;
581 void __init
acpi_no_s4_hw_signature(void)
586 static int acpi_hibernation_begin(void)
590 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
592 acpi_target_sleep_state
= ACPI_STATE_S4
;
593 acpi_sleep_tts_switch(acpi_target_sleep_state
);
599 static int acpi_hibernation_enter(void)
601 acpi_status status
= AE_OK
;
603 ACPI_FLUSH_CPU_CACHE();
605 /* This shouldn't return. If it returns, we have a problem */
606 status
= acpi_enter_sleep_state(ACPI_STATE_S4
, wake_sleep_flags
);
607 /* Reprogram control registers and execute _BFS */
608 acpi_leave_sleep_state_prep(ACPI_STATE_S4
, wake_sleep_flags
);
610 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
613 static void acpi_hibernation_leave(void)
616 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
620 /* Reprogram control registers and execute _BFS */
621 acpi_leave_sleep_state_prep(ACPI_STATE_S4
, wake_sleep_flags
);
622 /* Check the hardware signature */
623 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
) {
624 printk(KERN_EMERG
"ACPI: Hardware changed while hibernated, "
626 panic("ACPI S4 hardware signature mismatch");
628 /* Restore the NVS memory area */
629 suspend_nvs_restore();
630 /* Allow EC transactions to happen. */
631 acpi_ec_unblock_transactions_early();
634 static void acpi_pm_thaw(void)
636 acpi_ec_unblock_transactions();
637 acpi_enable_all_runtime_gpes();
640 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
641 .begin
= acpi_hibernation_begin
,
643 .pre_snapshot
= acpi_pm_prepare
,
644 .finish
= acpi_pm_finish
,
645 .prepare
= acpi_pm_prepare
,
646 .enter
= acpi_hibernation_enter
,
647 .leave
= acpi_hibernation_leave
,
648 .pre_restore
= acpi_pm_freeze
,
649 .restore_cleanup
= acpi_pm_thaw
,
653 * acpi_hibernation_begin_old - Set the target system sleep state to
654 * ACPI_STATE_S4 and execute the _PTS control method. This
655 * function is used if the pre-ACPI 2.0 suspend ordering has been
658 static int acpi_hibernation_begin_old(void)
662 * The _TTS object should always be evaluated before the _PTS object.
663 * When the old_suspended_ordering is true, the _PTS object is
664 * evaluated in the acpi_sleep_prepare.
666 acpi_sleep_tts_switch(ACPI_STATE_S4
);
668 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
672 error
= suspend_nvs_alloc();
674 acpi_target_sleep_state
= ACPI_STATE_S4
;
680 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
683 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
684 .begin
= acpi_hibernation_begin_old
,
686 .pre_snapshot
= acpi_pm_pre_suspend
,
687 .prepare
= acpi_pm_freeze
,
688 .finish
= acpi_pm_finish
,
689 .enter
= acpi_hibernation_enter
,
690 .leave
= acpi_hibernation_leave
,
691 .pre_restore
= acpi_pm_freeze
,
692 .restore_cleanup
= acpi_pm_thaw
,
693 .recover
= acpi_pm_finish
,
695 #endif /* CONFIG_HIBERNATION */
697 int acpi_suspend(u32 acpi_state
)
699 suspend_state_t states
[] = {
700 [1] = PM_SUSPEND_STANDBY
,
701 [3] = PM_SUSPEND_MEM
,
705 if (acpi_state
< 6 && states
[acpi_state
])
706 return pm_suspend(states
[acpi_state
]);
714 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
715 * in the system sleep state given by %acpi_target_sleep_state
716 * @dev: device to examine; its driver model wakeup flags control
717 * whether it should be able to wake up the system
718 * @d_min_p: used to store the upper limit of allowed states range
719 * Return value: preferred power state of the device on success, -ENODEV on
720 * failure (ie. if there's no 'struct acpi_device' for @dev)
722 * Find the lowest power (highest number) ACPI device power state that
723 * device @dev can be in while the system is in the sleep state represented
724 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
725 * able to wake up the system from this sleep state. If @d_min_p is set,
726 * the highest power (lowest number) device power state of @dev allowed
727 * in this system sleep state is stored at the location pointed to by it.
729 * The caller must ensure that @dev is valid before using this function.
730 * The caller is also responsible for figuring out if the device is
731 * supposed to be able to wake up the system and passing this information
735 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
)
737 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
738 struct acpi_device
*adev
;
739 char acpi_method
[] = "_SxD";
740 unsigned long long d_min
, d_max
;
742 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &adev
))) {
743 printk(KERN_DEBUG
"ACPI handle has no context!\n");
747 acpi_method
[2] = '0' + acpi_target_sleep_state
;
749 * If the sleep state is S0, we will return D3, but if the device has
750 * _S0W, we will use the value from _S0W
752 d_min
= ACPI_STATE_D0
;
753 d_max
= ACPI_STATE_D3
;
756 * If present, _SxD methods return the minimum D-state (highest power
757 * state) we can use for the corresponding S-states. Otherwise, the
758 * minimum D-state is D0 (ACPI 3.x).
760 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
761 * provided -- that's our fault recovery, we ignore retval.
763 if (acpi_target_sleep_state
> ACPI_STATE_S0
)
764 acpi_evaluate_integer(handle
, acpi_method
, NULL
, &d_min
);
767 * If _PRW says we can wake up the system from the target sleep state,
768 * the D-state returned by _SxD is sufficient for that (we assume a
769 * wakeup-aware driver if wake is set). Still, if _SxW exists
770 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
771 * can wake the system. _S0W may be valid, too.
773 if (acpi_target_sleep_state
== ACPI_STATE_S0
||
774 (device_may_wakeup(dev
) && adev
->wakeup
.flags
.valid
&&
775 adev
->wakeup
.sleep_state
>= acpi_target_sleep_state
)) {
778 acpi_method
[3] = 'W';
779 status
= acpi_evaluate_integer(handle
, acpi_method
, NULL
,
781 if (ACPI_FAILURE(status
)) {
782 if (acpi_target_sleep_state
!= ACPI_STATE_S0
||
783 status
!= AE_NOT_FOUND
)
785 } else if (d_max
< d_min
) {
786 /* Warn the user of the broken DSDT */
787 printk(KERN_WARNING
"ACPI: Wrong value from %s\n",
798 #endif /* CONFIG_PM */
800 #ifdef CONFIG_PM_SLEEP
802 * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
803 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
804 * @enable: Whether enable or disable the wake-up functionality.
806 * Find the ACPI device object corresponding to @pci_dev and try to
807 * enable/disable the GPE associated with it.
809 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
811 struct acpi_device
*dev
;
814 if (!device_run_wake(phys_dev
))
817 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
818 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &dev
))) {
819 dev_dbg(phys_dev
, "ACPI handle has no context in %s!\n",
825 acpi_enable_wakeup_device_power(dev
, ACPI_STATE_S0
);
826 acpi_enable_gpe(dev
->wakeup
.gpe_device
, dev
->wakeup
.gpe_number
);
828 acpi_disable_gpe(dev
->wakeup
.gpe_device
, dev
->wakeup
.gpe_number
);
829 acpi_disable_wakeup_device_power(dev
);
836 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
837 * capability of given device
838 * @dev: device to handle
839 * @enable: 'true' - enable, 'false' - disable the wake-up capability
841 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
844 struct acpi_device
*adev
;
847 if (!device_can_wakeup(dev
))
850 handle
= DEVICE_ACPI_HANDLE(dev
);
851 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &adev
))) {
852 dev_dbg(dev
, "ACPI handle has no context in %s!\n", __func__
);
857 acpi_enable_wakeup_device_power(adev
, acpi_target_sleep_state
) :
858 acpi_disable_wakeup_device_power(adev
);
860 dev_info(dev
, "wake-up capability %s by ACPI\n",
861 enable
? "enabled" : "disabled");
865 #endif /* CONFIG_PM_SLEEP */
867 static void acpi_power_off_prepare(void)
869 /* Prepare to power off the system */
870 acpi_sleep_prepare(ACPI_STATE_S5
);
871 acpi_disable_all_gpes();
874 static void acpi_power_off(void)
876 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
877 printk(KERN_DEBUG
"%s called\n", __func__
);
879 acpi_enter_sleep_state(ACPI_STATE_S5
, wake_sleep_flags
);
883 * ACPI 2.0 created the optional _GTS and _BFS,
884 * but industry adoption has been neither rapid nor broad.
886 * Linux gets into trouble when it executes poorly validated
887 * paths through the BIOS, so disable _GTS and _BFS by default,
888 * but do speak up and offer the option to enable them.
890 static void __init
acpi_gts_bfs_check(void)
894 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT
, METHOD_PATHNAME__GTS
, &dummy
)))
896 printk(KERN_NOTICE PREFIX
"BIOS offers _GTS\n");
897 printk(KERN_NOTICE PREFIX
"If \"acpi.gts=1\" improves suspend, "
898 "please notify linux-acpi@vger.kernel.org\n");
900 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT
, METHOD_PATHNAME__BFS
, &dummy
)))
902 printk(KERN_NOTICE PREFIX
"BIOS offers _BFS\n");
903 printk(KERN_NOTICE PREFIX
"If \"acpi.bfs=1\" improves resume, "
904 "please notify linux-acpi@vger.kernel.org\n");
908 int __init
acpi_sleep_init(void)
912 #ifdef CONFIG_SUSPEND
915 dmi_check_system(acpisleep_dmi_table
);
921 sleep_states
[ACPI_STATE_S0
] = 1;
922 printk(KERN_INFO PREFIX
"(supports S0");
924 #ifdef CONFIG_SUSPEND
925 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++) {
926 status
= acpi_get_sleep_type_data(i
, &type_a
, &type_b
);
927 if (ACPI_SUCCESS(status
)) {
929 printk(KERN_CONT
" S%d", i
);
933 suspend_set_ops(old_suspend_ordering
?
934 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
937 #ifdef CONFIG_HIBERNATION
938 status
= acpi_get_sleep_type_data(ACPI_STATE_S4
, &type_a
, &type_b
);
939 if (ACPI_SUCCESS(status
)) {
940 hibernation_set_ops(old_suspend_ordering
?
941 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
942 sleep_states
[ACPI_STATE_S4
] = 1;
943 printk(KERN_CONT
" S4");
945 acpi_get_table(ACPI_SIG_FACS
, 1,
946 (struct acpi_table_header
**)&facs
);
948 s4_hardware_signature
=
949 facs
->hardware_signature
;
953 status
= acpi_get_sleep_type_data(ACPI_STATE_S5
, &type_a
, &type_b
);
954 if (ACPI_SUCCESS(status
)) {
955 sleep_states
[ACPI_STATE_S5
] = 1;
956 printk(KERN_CONT
" S5");
957 pm_power_off_prepare
= acpi_power_off_prepare
;
958 pm_power_off
= acpi_power_off
;
960 printk(KERN_CONT
")\n");
962 * Register the tts_notifier to reboot notifier list so that the _TTS
963 * object can also be evaluated when the system enters S5.
965 register_reboot_notifier(&tts_notifier
);
966 acpi_gts_bfs_check();