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
];
61 static void acpi_sleep_tts_switch(u32 acpi_state
)
63 union acpi_object in_arg
= { ACPI_TYPE_INTEGER
};
64 struct acpi_object_list arg_list
= { 1, &in_arg
};
65 acpi_status status
= AE_OK
;
67 in_arg
.integer
.value
= acpi_state
;
68 status
= acpi_evaluate_object(NULL
, "\\_TTS", &arg_list
, NULL
);
69 if (ACPI_FAILURE(status
) && status
!= AE_NOT_FOUND
) {
71 * OS can't evaluate the _TTS object correctly. Some warning
72 * message will be printed. But it won't break anything.
74 printk(KERN_NOTICE
"Failure in evaluating _TTS object\n");
78 static int tts_notify_reboot(struct notifier_block
*this,
79 unsigned long code
, void *x
)
81 acpi_sleep_tts_switch(ACPI_STATE_S5
);
85 static struct notifier_block tts_notifier
= {
86 .notifier_call
= tts_notify_reboot
,
91 static int acpi_sleep_prepare(u32 acpi_state
)
93 #ifdef CONFIG_ACPI_SLEEP
94 /* do we have a wakeup address for S2 and S3? */
95 if (acpi_state
== ACPI_STATE_S3
) {
96 if (!acpi_wakeup_address
)
98 acpi_set_firmware_waking_vector(acpi_wakeup_address
);
101 ACPI_FLUSH_CPU_CACHE();
103 printk(KERN_INFO PREFIX
"Preparing to enter system sleep state S%d\n",
105 acpi_enable_wakeup_devices(acpi_state
);
106 acpi_enter_sleep_state_prep(acpi_state
);
110 #ifdef CONFIG_ACPI_SLEEP
111 static u32 acpi_target_sleep_state
= ACPI_STATE_S0
;
114 * The ACPI specification wants us to save NVS memory regions during hibernation
115 * and to restore them during the subsequent resume. Windows does that also for
116 * suspend to RAM. However, it is known that this mechanism does not work on
117 * all machines, so we allow the user to disable it with the help of the
118 * 'acpi_sleep=nonvs' kernel command line option.
120 static bool nvs_nosave
;
122 void __init
acpi_nvs_nosave(void)
128 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
129 * user to request that behavior by using the 'acpi_old_suspend_ordering'
130 * kernel command line option that causes the following variable to be set.
132 static bool old_suspend_ordering
;
134 void __init
acpi_old_suspend_ordering(void)
136 old_suspend_ordering
= true;
140 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
142 static int acpi_pm_freeze(void)
144 acpi_disable_all_gpes();
145 acpi_os_wait_events_complete(NULL
);
146 acpi_ec_block_transactions();
151 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
153 static int acpi_pm_pre_suspend(void)
156 return suspend_nvs_save();
160 * __acpi_pm_prepare - Prepare the platform to enter the target state.
162 * If necessary, set the firmware waking vector and do arch-specific
163 * nastiness to get the wakeup code to the waking vector.
165 static int __acpi_pm_prepare(void)
167 int error
= acpi_sleep_prepare(acpi_target_sleep_state
);
169 acpi_target_sleep_state
= ACPI_STATE_S0
;
175 * acpi_pm_prepare - Prepare the platform to enter the target sleep
176 * state and disable the GPEs.
178 static int acpi_pm_prepare(void)
180 int error
= __acpi_pm_prepare();
182 error
= acpi_pm_pre_suspend();
188 * acpi_pm_finish - Instruct the platform to leave a sleep state.
190 * This is called after we wake back up (or if entering the sleep state
193 static void acpi_pm_finish(void)
195 u32 acpi_state
= acpi_target_sleep_state
;
197 acpi_ec_unblock_transactions();
200 if (acpi_state
== ACPI_STATE_S0
)
203 printk(KERN_INFO PREFIX
"Waking up from system sleep state S%d\n",
205 acpi_disable_wakeup_devices(acpi_state
);
206 acpi_leave_sleep_state(acpi_state
);
208 /* reset firmware waking vector */
209 acpi_set_firmware_waking_vector((acpi_physical_address
) 0);
211 acpi_target_sleep_state
= ACPI_STATE_S0
;
215 * acpi_pm_end - Finish up suspend sequence.
217 static void acpi_pm_end(void)
220 * This is necessary in case acpi_pm_finish() is not called during a
221 * failing transition to a sleep state.
223 acpi_target_sleep_state
= ACPI_STATE_S0
;
224 acpi_sleep_tts_switch(acpi_target_sleep_state
);
226 #else /* !CONFIG_ACPI_SLEEP */
227 #define acpi_target_sleep_state ACPI_STATE_S0
228 #endif /* CONFIG_ACPI_SLEEP */
230 #ifdef CONFIG_SUSPEND
231 static u32 acpi_suspend_states
[] = {
232 [PM_SUSPEND_ON
] = ACPI_STATE_S0
,
233 [PM_SUSPEND_STANDBY
] = ACPI_STATE_S1
,
234 [PM_SUSPEND_MEM
] = ACPI_STATE_S3
,
235 [PM_SUSPEND_MAX
] = ACPI_STATE_S5
239 * acpi_suspend_begin - Set the target system sleep state to the state
240 * associated with given @pm_state, if supported.
242 static int acpi_suspend_begin(suspend_state_t pm_state
)
244 u32 acpi_state
= acpi_suspend_states
[pm_state
];
247 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
251 if (sleep_states
[acpi_state
]) {
252 acpi_target_sleep_state
= acpi_state
;
253 acpi_sleep_tts_switch(acpi_target_sleep_state
);
255 printk(KERN_ERR
"ACPI does not support this state: %d\n",
263 * acpi_suspend_enter - Actually enter a sleep state.
266 * Flush caches and go to sleep. For STR we have to call arch-specific
267 * assembly, which in turn call acpi_enter_sleep_state().
268 * It's unfortunate, but it works. Please fix if you're feeling frisky.
270 static int acpi_suspend_enter(suspend_state_t pm_state
)
272 acpi_status status
= AE_OK
;
273 u32 acpi_state
= acpi_target_sleep_state
;
276 ACPI_FLUSH_CPU_CACHE();
278 switch (acpi_state
) {
281 status
= acpi_enter_sleep_state(acpi_state
, wake_sleep_flags
);
285 error
= acpi_suspend_lowlevel();
288 pr_info(PREFIX
"Low-level resume complete\n");
292 /* This violates the spec but is required for bug compatibility. */
293 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE
, 1);
295 /* Reprogram control registers and execute _BFS */
296 acpi_leave_sleep_state_prep(acpi_state
, wake_sleep_flags
);
298 /* ACPI 3.0 specs (P62) says that it's the responsibility
299 * of the OSPM to clear the status bit [ implying that the
300 * POWER_BUTTON event should not reach userspace ]
302 if (ACPI_SUCCESS(status
) && (acpi_state
== ACPI_STATE_S3
))
303 acpi_clear_event(ACPI_EVENT_POWER_BUTTON
);
306 * Disable and clear GPE status before interrupt is enabled. Some GPEs
307 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
308 * acpi_leave_sleep_state will reenable specific GPEs later
310 acpi_disable_all_gpes();
311 /* Allow EC transactions to happen. */
312 acpi_ec_unblock_transactions_early();
314 suspend_nvs_restore();
316 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
319 static int acpi_suspend_state_valid(suspend_state_t pm_state
)
325 case PM_SUSPEND_STANDBY
:
327 acpi_state
= acpi_suspend_states
[pm_state
];
329 return sleep_states
[acpi_state
];
335 static const struct platform_suspend_ops acpi_suspend_ops
= {
336 .valid
= acpi_suspend_state_valid
,
337 .begin
= acpi_suspend_begin
,
338 .prepare_late
= acpi_pm_prepare
,
339 .enter
= acpi_suspend_enter
,
340 .wake
= acpi_pm_finish
,
345 * acpi_suspend_begin_old - Set the target system sleep state to the
346 * state associated with given @pm_state, if supported, and
347 * execute the _PTS control method. This function is used if the
348 * pre-ACPI 2.0 suspend ordering has been requested.
350 static int acpi_suspend_begin_old(suspend_state_t pm_state
)
352 int error
= acpi_suspend_begin(pm_state
);
354 error
= __acpi_pm_prepare();
360 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
363 static const struct platform_suspend_ops acpi_suspend_ops_old
= {
364 .valid
= acpi_suspend_state_valid
,
365 .begin
= acpi_suspend_begin_old
,
366 .prepare_late
= acpi_pm_pre_suspend
,
367 .enter
= acpi_suspend_enter
,
368 .wake
= acpi_pm_finish
,
370 .recover
= acpi_pm_finish
,
373 static int __init
init_old_suspend_ordering(const struct dmi_system_id
*d
)
375 old_suspend_ordering
= true;
379 static int __init
init_nvs_nosave(const struct dmi_system_id
*d
)
385 static struct dmi_system_id __initdata acpisleep_dmi_table
[] = {
387 .callback
= init_old_suspend_ordering
,
388 .ident
= "Abit KN9 (nForce4 variant)",
390 DMI_MATCH(DMI_BOARD_VENDOR
, "http://www.abit.com.tw/"),
391 DMI_MATCH(DMI_BOARD_NAME
, "KN9 Series(NF-CK804)"),
395 .callback
= init_old_suspend_ordering
,
396 .ident
= "HP xw4600 Workstation",
398 DMI_MATCH(DMI_SYS_VENDOR
, "Hewlett-Packard"),
399 DMI_MATCH(DMI_PRODUCT_NAME
, "HP xw4600 Workstation"),
403 .callback
= init_old_suspend_ordering
,
404 .ident
= "Asus Pundit P1-AH2 (M2N8L motherboard)",
406 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTek Computer INC."),
407 DMI_MATCH(DMI_BOARD_NAME
, "M2N8L"),
411 .callback
= init_old_suspend_ordering
,
412 .ident
= "Panasonic CF51-2L",
414 DMI_MATCH(DMI_BOARD_VENDOR
,
415 "Matsushita Electric Industrial Co.,Ltd."),
416 DMI_MATCH(DMI_BOARD_NAME
, "CF51-2L"),
420 .callback
= init_nvs_nosave
,
421 .ident
= "Sony Vaio VGN-FW21E",
423 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
424 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW21E"),
428 .callback
= init_nvs_nosave
,
429 .ident
= "Sony Vaio VPCEB17FX",
431 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
432 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB17FX"),
436 .callback
= init_nvs_nosave
,
437 .ident
= "Sony Vaio VGN-SR11M",
439 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
440 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR11M"),
444 .callback
= init_nvs_nosave
,
445 .ident
= "Everex StepNote Series",
447 DMI_MATCH(DMI_SYS_VENDOR
, "Everex Systems, Inc."),
448 DMI_MATCH(DMI_PRODUCT_NAME
, "Everex StepNote Series"),
452 .callback
= init_nvs_nosave
,
453 .ident
= "Sony Vaio VPCEB1Z1E",
455 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
456 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCEB1Z1E"),
460 .callback
= init_nvs_nosave
,
461 .ident
= "Sony Vaio VGN-NW130D",
463 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
464 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-NW130D"),
468 .callback
= init_nvs_nosave
,
469 .ident
= "Sony Vaio VPCCW29FX",
471 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
472 DMI_MATCH(DMI_PRODUCT_NAME
, "VPCCW29FX"),
476 .callback
= init_nvs_nosave
,
477 .ident
= "Averatec AV1020-ED2",
479 DMI_MATCH(DMI_SYS_VENDOR
, "AVERATEC"),
480 DMI_MATCH(DMI_PRODUCT_NAME
, "1000 Series"),
484 .callback
= init_old_suspend_ordering
,
485 .ident
= "Asus A8N-SLI DELUXE",
487 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
488 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI DELUXE"),
492 .callback
= init_old_suspend_ordering
,
493 .ident
= "Asus A8N-SLI Premium",
495 DMI_MATCH(DMI_BOARD_VENDOR
, "ASUSTeK Computer INC."),
496 DMI_MATCH(DMI_BOARD_NAME
, "A8N-SLI Premium"),
500 .callback
= init_nvs_nosave
,
501 .ident
= "Sony Vaio VGN-SR26GN_P",
503 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
504 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-SR26GN_P"),
508 .callback
= init_nvs_nosave
,
509 .ident
= "Sony Vaio VGN-FW520F",
511 DMI_MATCH(DMI_SYS_VENDOR
, "Sony Corporation"),
512 DMI_MATCH(DMI_PRODUCT_NAME
, "VGN-FW520F"),
516 .callback
= init_nvs_nosave
,
517 .ident
= "Asus K54C",
519 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
520 DMI_MATCH(DMI_PRODUCT_NAME
, "K54C"),
524 .callback
= init_nvs_nosave
,
525 .ident
= "Asus K54HR",
527 DMI_MATCH(DMI_SYS_VENDOR
, "ASUSTeK Computer Inc."),
528 DMI_MATCH(DMI_PRODUCT_NAME
, "K54HR"),
533 #endif /* CONFIG_SUSPEND */
535 #ifdef CONFIG_HIBERNATION
536 static unsigned long s4_hardware_signature
;
537 static struct acpi_table_facs
*facs
;
538 static bool nosigcheck
;
540 void __init
acpi_no_s4_hw_signature(void)
545 static int acpi_hibernation_begin(void)
549 error
= nvs_nosave
? 0 : suspend_nvs_alloc();
551 acpi_target_sleep_state
= ACPI_STATE_S4
;
552 acpi_sleep_tts_switch(acpi_target_sleep_state
);
558 static int acpi_hibernation_enter(void)
560 acpi_status status
= AE_OK
;
562 ACPI_FLUSH_CPU_CACHE();
564 /* This shouldn't return. If it returns, we have a problem */
565 status
= acpi_enter_sleep_state(ACPI_STATE_S4
, wake_sleep_flags
);
566 /* Reprogram control registers and execute _BFS */
567 acpi_leave_sleep_state_prep(ACPI_STATE_S4
, wake_sleep_flags
);
569 return ACPI_SUCCESS(status
) ? 0 : -EFAULT
;
572 static void acpi_hibernation_leave(void)
575 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
579 /* Reprogram control registers and execute _BFS */
580 acpi_leave_sleep_state_prep(ACPI_STATE_S4
, wake_sleep_flags
);
581 /* Check the hardware signature */
582 if (facs
&& s4_hardware_signature
!= facs
->hardware_signature
) {
583 printk(KERN_EMERG
"ACPI: Hardware changed while hibernated, "
585 panic("ACPI S4 hardware signature mismatch");
587 /* Restore the NVS memory area */
588 suspend_nvs_restore();
589 /* Allow EC transactions to happen. */
590 acpi_ec_unblock_transactions_early();
593 static void acpi_pm_thaw(void)
595 acpi_ec_unblock_transactions();
596 acpi_enable_all_runtime_gpes();
599 static const struct platform_hibernation_ops acpi_hibernation_ops
= {
600 .begin
= acpi_hibernation_begin
,
602 .pre_snapshot
= acpi_pm_prepare
,
603 .finish
= acpi_pm_finish
,
604 .prepare
= acpi_pm_prepare
,
605 .enter
= acpi_hibernation_enter
,
606 .leave
= acpi_hibernation_leave
,
607 .pre_restore
= acpi_pm_freeze
,
608 .restore_cleanup
= acpi_pm_thaw
,
612 * acpi_hibernation_begin_old - Set the target system sleep state to
613 * ACPI_STATE_S4 and execute the _PTS control method. This
614 * function is used if the pre-ACPI 2.0 suspend ordering has been
617 static int acpi_hibernation_begin_old(void)
621 * The _TTS object should always be evaluated before the _PTS object.
622 * When the old_suspended_ordering is true, the _PTS object is
623 * evaluated in the acpi_sleep_prepare.
625 acpi_sleep_tts_switch(ACPI_STATE_S4
);
627 error
= acpi_sleep_prepare(ACPI_STATE_S4
);
631 error
= suspend_nvs_alloc();
633 acpi_target_sleep_state
= ACPI_STATE_S4
;
639 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
642 static const struct platform_hibernation_ops acpi_hibernation_ops_old
= {
643 .begin
= acpi_hibernation_begin_old
,
645 .pre_snapshot
= acpi_pm_pre_suspend
,
646 .prepare
= acpi_pm_freeze
,
647 .finish
= acpi_pm_finish
,
648 .enter
= acpi_hibernation_enter
,
649 .leave
= acpi_hibernation_leave
,
650 .pre_restore
= acpi_pm_freeze
,
651 .restore_cleanup
= acpi_pm_thaw
,
652 .recover
= acpi_pm_finish
,
654 #endif /* CONFIG_HIBERNATION */
656 int acpi_suspend(u32 acpi_state
)
658 suspend_state_t states
[] = {
659 [1] = PM_SUSPEND_STANDBY
,
660 [3] = PM_SUSPEND_MEM
,
664 if (acpi_state
< 6 && states
[acpi_state
])
665 return pm_suspend(states
[acpi_state
]);
673 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
674 * in the system sleep state given by %acpi_target_sleep_state
675 * @dev: device to examine; its driver model wakeup flags control
676 * whether it should be able to wake up the system
677 * @d_min_p: used to store the upper limit of allowed states range
678 * Return value: preferred power state of the device on success, -ENODEV on
679 * failure (ie. if there's no 'struct acpi_device' for @dev)
681 * Find the lowest power (highest number) ACPI device power state that
682 * device @dev can be in while the system is in the sleep state represented
683 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
684 * able to wake up the system from this sleep state. If @d_min_p is set,
685 * the highest power (lowest number) device power state of @dev allowed
686 * in this system sleep state is stored at the location pointed to by it.
688 * The caller must ensure that @dev is valid before using this function.
689 * The caller is also responsible for figuring out if the device is
690 * supposed to be able to wake up the system and passing this information
694 int acpi_pm_device_sleep_state(struct device
*dev
, int *d_min_p
)
696 acpi_handle handle
= DEVICE_ACPI_HANDLE(dev
);
697 struct acpi_device
*adev
;
698 char acpi_method
[] = "_SxD";
699 unsigned long long d_min
, d_max
;
701 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &adev
))) {
702 printk(KERN_DEBUG
"ACPI handle has no context!\n");
706 acpi_method
[2] = '0' + acpi_target_sleep_state
;
708 * If the sleep state is S0, we will return D3, but if the device has
709 * _S0W, we will use the value from _S0W
711 d_min
= ACPI_STATE_D0
;
712 d_max
= ACPI_STATE_D3
;
715 * If present, _SxD methods return the minimum D-state (highest power
716 * state) we can use for the corresponding S-states. Otherwise, the
717 * minimum D-state is D0 (ACPI 3.x).
719 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
720 * provided -- that's our fault recovery, we ignore retval.
722 if (acpi_target_sleep_state
> ACPI_STATE_S0
)
723 acpi_evaluate_integer(handle
, acpi_method
, NULL
, &d_min
);
726 * If _PRW says we can wake up the system from the target sleep state,
727 * the D-state returned by _SxD is sufficient for that (we assume a
728 * wakeup-aware driver if wake is set). Still, if _SxW exists
729 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
730 * can wake the system. _S0W may be valid, too.
732 if (acpi_target_sleep_state
== ACPI_STATE_S0
||
733 (device_may_wakeup(dev
) &&
734 adev
->wakeup
.sleep_state
<= acpi_target_sleep_state
)) {
737 acpi_method
[3] = 'W';
738 status
= acpi_evaluate_integer(handle
, acpi_method
, NULL
,
740 if (ACPI_FAILURE(status
)) {
741 if (acpi_target_sleep_state
!= ACPI_STATE_S0
||
742 status
!= AE_NOT_FOUND
)
744 } else if (d_max
< d_min
) {
745 /* Warn the user of the broken DSDT */
746 printk(KERN_WARNING
"ACPI: Wrong value from %s\n",
757 #endif /* CONFIG_PM */
759 #ifdef CONFIG_PM_SLEEP
761 * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
762 * @phys_dev: Device to enable/disable the platform to wake-up the system for.
763 * @enable: Whether enable or disable the wake-up functionality.
765 * Find the ACPI device object corresponding to @pci_dev and try to
766 * enable/disable the GPE associated with it.
768 int acpi_pm_device_run_wake(struct device
*phys_dev
, bool enable
)
770 struct acpi_device
*dev
;
773 if (!device_run_wake(phys_dev
))
776 handle
= DEVICE_ACPI_HANDLE(phys_dev
);
777 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &dev
))) {
778 dev_dbg(phys_dev
, "ACPI handle has no context in %s!\n",
784 acpi_enable_wakeup_device_power(dev
, ACPI_STATE_S0
);
785 acpi_enable_gpe(dev
->wakeup
.gpe_device
, dev
->wakeup
.gpe_number
);
787 acpi_disable_gpe(dev
->wakeup
.gpe_device
, dev
->wakeup
.gpe_number
);
788 acpi_disable_wakeup_device_power(dev
);
795 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
796 * capability of given device
797 * @dev: device to handle
798 * @enable: 'true' - enable, 'false' - disable the wake-up capability
800 int acpi_pm_device_sleep_wake(struct device
*dev
, bool enable
)
803 struct acpi_device
*adev
;
806 if (!device_can_wakeup(dev
))
809 handle
= DEVICE_ACPI_HANDLE(dev
);
810 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &adev
))) {
811 dev_dbg(dev
, "ACPI handle has no context in %s!\n", __func__
);
816 acpi_enable_wakeup_device_power(adev
, acpi_target_sleep_state
) :
817 acpi_disable_wakeup_device_power(adev
);
819 dev_info(dev
, "wake-up capability %s by ACPI\n",
820 enable
? "enabled" : "disabled");
824 #endif /* CONFIG_PM_SLEEP */
826 static void acpi_power_off_prepare(void)
828 /* Prepare to power off the system */
829 acpi_sleep_prepare(ACPI_STATE_S5
);
830 acpi_disable_all_gpes();
833 static void acpi_power_off(void)
835 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
836 printk(KERN_DEBUG
"%s called\n", __func__
);
838 acpi_enter_sleep_state(ACPI_STATE_S5
, wake_sleep_flags
);
842 * ACPI 2.0 created the optional _GTS and _BFS,
843 * but industry adoption has been neither rapid nor broad.
845 * Linux gets into trouble when it executes poorly validated
846 * paths through the BIOS, so disable _GTS and _BFS by default,
847 * but do speak up and offer the option to enable them.
849 static void __init
acpi_gts_bfs_check(void)
853 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT
, METHOD_PATHNAME__GTS
, &dummy
)))
855 printk(KERN_NOTICE PREFIX
"BIOS offers _GTS\n");
856 printk(KERN_NOTICE PREFIX
"If \"acpi.gts=1\" improves suspend, "
857 "please notify linux-acpi@vger.kernel.org\n");
859 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT
, METHOD_PATHNAME__BFS
, &dummy
)))
861 printk(KERN_NOTICE PREFIX
"BIOS offers _BFS\n");
862 printk(KERN_NOTICE PREFIX
"If \"acpi.bfs=1\" improves resume, "
863 "please notify linux-acpi@vger.kernel.org\n");
867 int __init
acpi_sleep_init(void)
871 #ifdef CONFIG_SUSPEND
874 dmi_check_system(acpisleep_dmi_table
);
880 sleep_states
[ACPI_STATE_S0
] = 1;
881 printk(KERN_INFO PREFIX
"(supports S0");
883 #ifdef CONFIG_SUSPEND
884 for (i
= ACPI_STATE_S1
; i
< ACPI_STATE_S4
; i
++) {
885 status
= acpi_get_sleep_type_data(i
, &type_a
, &type_b
);
886 if (ACPI_SUCCESS(status
)) {
888 printk(KERN_CONT
" S%d", i
);
892 suspend_set_ops(old_suspend_ordering
?
893 &acpi_suspend_ops_old
: &acpi_suspend_ops
);
896 #ifdef CONFIG_HIBERNATION
897 status
= acpi_get_sleep_type_data(ACPI_STATE_S4
, &type_a
, &type_b
);
898 if (ACPI_SUCCESS(status
)) {
899 hibernation_set_ops(old_suspend_ordering
?
900 &acpi_hibernation_ops_old
: &acpi_hibernation_ops
);
901 sleep_states
[ACPI_STATE_S4
] = 1;
902 printk(KERN_CONT
" S4");
904 acpi_get_table(ACPI_SIG_FACS
, 1,
905 (struct acpi_table_header
**)&facs
);
907 s4_hardware_signature
=
908 facs
->hardware_signature
;
912 status
= acpi_get_sleep_type_data(ACPI_STATE_S5
, &type_a
, &type_b
);
913 if (ACPI_SUCCESS(status
)) {
914 sleep_states
[ACPI_STATE_S5
] = 1;
915 printk(KERN_CONT
" S5");
916 pm_power_off_prepare
= acpi_power_off_prepare
;
917 pm_power_off
= acpi_power_off
;
919 printk(KERN_CONT
")\n");
921 * Register the tts_notifier to reboot notifier list so that the _TTS
922 * object can also be evaluated when the system enters S5.
924 register_reboot_notifier(&tts_notifier
);
925 acpi_gts_bfs_check();