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();