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>
23 #include <acpi/acpi_bus.h>
24 #include <acpi/acpi_drivers.h>
29 static u8 sleep_states[ACPI_S_STATE_COUNT];
31 static void acpi_sleep_tts_switch(u32 acpi_state)
33 union acpi_object in_arg = { ACPI_TYPE_INTEGER };
34 struct acpi_object_list arg_list = { 1, &in_arg };
35 acpi_status status = AE_OK;
37 in_arg.integer.value = acpi_state;
38 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
39 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
41 * OS can't evaluate the _TTS object correctly. Some warning
42 * message will be printed. But it won't break anything.
44 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
48 static int tts_notify_reboot(struct notifier_block *this,
49 unsigned long code, void *x)
51 acpi_sleep_tts_switch(ACPI_STATE_S5);
55 static struct notifier_block tts_notifier = {
56 .notifier_call = tts_notify_reboot,
61 static int acpi_sleep_prepare(u32 acpi_state)
63 #ifdef CONFIG_ACPI_SLEEP
64 /* do we have a wakeup address for S2 and S3? */
65 if (acpi_state == ACPI_STATE_S3) {
66 if (!acpi_wakeup_address) {
69 acpi_set_firmware_waking_vector(
70 (acpi_physical_address)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 #ifdef CONFIG_ACPI_SLEEP
83 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
86 * The ACPI specification wants us to save NVS memory regions during hibernation
87 * and to restore them during the subsequent resume. Windows does that also for
88 * suspend to RAM. However, it is known that this mechanism does not work on
89 * all machines, so we allow the user to disable it with the help of the
90 * 'acpi_sleep=nonvs' kernel command line option.
92 static bool nvs_nosave;
94 void __init acpi_nvs_nosave(void)
100 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
101 * user to request that behavior by using the 'acpi_old_suspend_ordering'
102 * kernel command line option that causes the following variable to be set.
104 static bool old_suspend_ordering;
106 void __init acpi_old_suspend_ordering(void)
108 old_suspend_ordering = true;
111 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
113 acpi_old_suspend_ordering();
117 static int __init init_nvs_nosave(const struct dmi_system_id *d)
123 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
125 .callback = init_old_suspend_ordering,
126 .ident = "Abit KN9 (nForce4 variant)",
128 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
129 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
133 .callback = init_old_suspend_ordering,
134 .ident = "HP xw4600 Workstation",
136 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
137 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
141 .callback = init_old_suspend_ordering,
142 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
144 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
145 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
149 .callback = init_old_suspend_ordering,
150 .ident = "Panasonic CF51-2L",
152 DMI_MATCH(DMI_BOARD_VENDOR,
153 "Matsushita Electric Industrial Co.,Ltd."),
154 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
158 .callback = init_nvs_nosave,
159 .ident = "Sony Vaio VGN-FW41E_H",
161 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
162 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
166 .callback = init_nvs_nosave,
167 .ident = "Sony Vaio VGN-FW21E",
169 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
170 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
174 .callback = init_nvs_nosave,
175 .ident = "Sony Vaio VPCEB17FX",
177 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
178 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
182 .callback = init_nvs_nosave,
183 .ident = "Sony Vaio VGN-SR11M",
185 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
186 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
190 .callback = init_nvs_nosave,
191 .ident = "Everex StepNote Series",
193 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
194 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
198 .callback = init_nvs_nosave,
199 .ident = "Sony Vaio VPCEB1Z1E",
201 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
202 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
206 .callback = init_nvs_nosave,
207 .ident = "Sony Vaio VGN-NW130D",
209 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
214 .callback = init_nvs_nosave,
215 .ident = "Sony Vaio VPCCW29FX",
217 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
222 .callback = init_nvs_nosave,
223 .ident = "Averatec AV1020-ED2",
225 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
226 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
230 .callback = init_old_suspend_ordering,
231 .ident = "Asus A8N-SLI DELUXE",
233 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
234 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
238 .callback = init_old_suspend_ordering,
239 .ident = "Asus A8N-SLI Premium",
241 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
242 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
246 .callback = init_nvs_nosave,
247 .ident = "Sony Vaio VGN-SR26GN_P",
249 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
250 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
254 .callback = init_nvs_nosave,
255 .ident = "Sony Vaio VPCEB1S1E",
257 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
262 .callback = init_nvs_nosave,
263 .ident = "Sony Vaio VGN-FW520F",
265 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
270 .callback = init_nvs_nosave,
271 .ident = "Asus K54C",
273 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
274 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
278 .callback = init_nvs_nosave,
279 .ident = "Asus K54HR",
281 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
282 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
288 static void acpi_sleep_dmi_check(void)
290 dmi_check_system(acpisleep_dmi_table);
294 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
296 static int acpi_pm_freeze(void)
298 acpi_disable_all_gpes();
299 acpi_os_wait_events_complete(NULL);
300 acpi_ec_block_transactions();
305 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
307 static int acpi_pm_pre_suspend(void)
310 return suspend_nvs_save();
314 * __acpi_pm_prepare - Prepare the platform to enter the target state.
316 * If necessary, set the firmware waking vector and do arch-specific
317 * nastiness to get the wakeup code to the waking vector.
319 static int __acpi_pm_prepare(void)
321 int error = acpi_sleep_prepare(acpi_target_sleep_state);
323 acpi_target_sleep_state = ACPI_STATE_S0;
329 * acpi_pm_prepare - Prepare the platform to enter the target sleep
330 * state and disable the GPEs.
332 static int acpi_pm_prepare(void)
334 int error = __acpi_pm_prepare();
336 error = acpi_pm_pre_suspend();
342 * acpi_pm_finish - Instruct the platform to leave a sleep state.
344 * This is called after we wake back up (or if entering the sleep state
347 static void acpi_pm_finish(void)
349 u32 acpi_state = acpi_target_sleep_state;
351 acpi_ec_unblock_transactions();
354 if (acpi_state == ACPI_STATE_S0)
357 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
359 acpi_disable_wakeup_devices(acpi_state);
360 acpi_leave_sleep_state(acpi_state);
362 /* reset firmware waking vector */
363 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
365 acpi_target_sleep_state = ACPI_STATE_S0;
369 * acpi_pm_end - Finish up suspend sequence.
371 static void acpi_pm_end(void)
374 * This is necessary in case acpi_pm_finish() is not called during a
375 * failing transition to a sleep state.
377 acpi_target_sleep_state = ACPI_STATE_S0;
378 acpi_sleep_tts_switch(acpi_target_sleep_state);
380 #else /* !CONFIG_ACPI_SLEEP */
381 #define acpi_target_sleep_state ACPI_STATE_S0
382 static inline void acpi_sleep_dmi_check(void) {}
383 #endif /* CONFIG_ACPI_SLEEP */
385 #ifdef CONFIG_SUSPEND
386 static u32 acpi_suspend_states[] = {
387 [PM_SUSPEND_ON] = ACPI_STATE_S0,
388 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
389 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
390 [PM_SUSPEND_MAX] = ACPI_STATE_S5
394 * acpi_suspend_begin - Set the target system sleep state to the state
395 * associated with given @pm_state, if supported.
397 static int acpi_suspend_begin(suspend_state_t pm_state)
399 u32 acpi_state = acpi_suspend_states[pm_state];
402 error = nvs_nosave ? 0 : suspend_nvs_alloc();
406 if (sleep_states[acpi_state]) {
407 acpi_target_sleep_state = acpi_state;
408 acpi_sleep_tts_switch(acpi_target_sleep_state);
410 printk(KERN_ERR "ACPI does not support this state: %d\n",
418 * acpi_suspend_enter - Actually enter a sleep state.
421 * Flush caches and go to sleep. For STR we have to call arch-specific
422 * assembly, which in turn call acpi_enter_sleep_state().
423 * It's unfortunate, but it works. Please fix if you're feeling frisky.
425 static int acpi_suspend_enter(suspend_state_t pm_state)
427 acpi_status status = AE_OK;
428 u32 acpi_state = acpi_target_sleep_state;
431 ACPI_FLUSH_CPU_CACHE();
433 switch (acpi_state) {
436 status = acpi_enter_sleep_state(acpi_state);
440 error = acpi_suspend_lowlevel();
443 pr_info(PREFIX "Low-level resume complete\n");
447 /* This violates the spec but is required for bug compatibility. */
448 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
450 /* Reprogram control registers and execute _BFS */
451 acpi_leave_sleep_state_prep(acpi_state);
453 /* ACPI 3.0 specs (P62) says that it's the responsibility
454 * of the OSPM to clear the status bit [ implying that the
455 * POWER_BUTTON event should not reach userspace ]
457 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
458 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
461 * Disable and clear GPE status before interrupt is enabled. Some GPEs
462 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
463 * acpi_leave_sleep_state will reenable specific GPEs later
465 acpi_disable_all_gpes();
466 /* Allow EC transactions to happen. */
467 acpi_ec_unblock_transactions_early();
469 suspend_nvs_restore();
471 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
474 static int acpi_suspend_state_valid(suspend_state_t pm_state)
480 case PM_SUSPEND_STANDBY:
482 acpi_state = acpi_suspend_states[pm_state];
484 return sleep_states[acpi_state];
490 static const struct platform_suspend_ops acpi_suspend_ops = {
491 .valid = acpi_suspend_state_valid,
492 .begin = acpi_suspend_begin,
493 .prepare_late = acpi_pm_prepare,
494 .enter = acpi_suspend_enter,
495 .wake = acpi_pm_finish,
500 * acpi_suspend_begin_old - Set the target system sleep state to the
501 * state associated with given @pm_state, if supported, and
502 * execute the _PTS control method. This function is used if the
503 * pre-ACPI 2.0 suspend ordering has been requested.
505 static int acpi_suspend_begin_old(suspend_state_t pm_state)
507 int error = acpi_suspend_begin(pm_state);
509 error = __acpi_pm_prepare();
515 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
518 static const struct platform_suspend_ops acpi_suspend_ops_old = {
519 .valid = acpi_suspend_state_valid,
520 .begin = acpi_suspend_begin_old,
521 .prepare_late = acpi_pm_pre_suspend,
522 .enter = acpi_suspend_enter,
523 .wake = acpi_pm_finish,
525 .recover = acpi_pm_finish,
527 #endif /* CONFIG_SUSPEND */
529 #ifdef CONFIG_HIBERNATION
530 static unsigned long s4_hardware_signature;
531 static struct acpi_table_facs *facs;
532 static bool nosigcheck;
534 void __init acpi_no_s4_hw_signature(void)
539 static int acpi_hibernation_begin(void)
543 error = nvs_nosave ? 0 : suspend_nvs_alloc();
545 acpi_target_sleep_state = ACPI_STATE_S4;
546 acpi_sleep_tts_switch(acpi_target_sleep_state);
552 static int acpi_hibernation_enter(void)
554 acpi_status status = AE_OK;
556 ACPI_FLUSH_CPU_CACHE();
558 /* This shouldn't return. If it returns, we have a problem */
559 status = acpi_enter_sleep_state(ACPI_STATE_S4);
560 /* Reprogram control registers and execute _BFS */
561 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
563 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
566 static void acpi_hibernation_leave(void)
569 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
573 /* Reprogram control registers and execute _BFS */
574 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
575 /* Check the hardware signature */
576 if (facs && s4_hardware_signature != facs->hardware_signature) {
577 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
579 panic("ACPI S4 hardware signature mismatch");
581 /* Restore the NVS memory area */
582 suspend_nvs_restore();
583 /* Allow EC transactions to happen. */
584 acpi_ec_unblock_transactions_early();
587 static void acpi_pm_thaw(void)
589 acpi_ec_unblock_transactions();
590 acpi_enable_all_runtime_gpes();
593 static const struct platform_hibernation_ops acpi_hibernation_ops = {
594 .begin = acpi_hibernation_begin,
596 .pre_snapshot = acpi_pm_prepare,
597 .finish = acpi_pm_finish,
598 .prepare = acpi_pm_prepare,
599 .enter = acpi_hibernation_enter,
600 .leave = acpi_hibernation_leave,
601 .pre_restore = acpi_pm_freeze,
602 .restore_cleanup = acpi_pm_thaw,
606 * acpi_hibernation_begin_old - Set the target system sleep state to
607 * ACPI_STATE_S4 and execute the _PTS control method. This
608 * function is used if the pre-ACPI 2.0 suspend ordering has been
611 static int acpi_hibernation_begin_old(void)
615 * The _TTS object should always be evaluated before the _PTS object.
616 * When the old_suspended_ordering is true, the _PTS object is
617 * evaluated in the acpi_sleep_prepare.
619 acpi_sleep_tts_switch(ACPI_STATE_S4);
621 error = acpi_sleep_prepare(ACPI_STATE_S4);
625 error = suspend_nvs_alloc();
627 acpi_target_sleep_state = ACPI_STATE_S4;
633 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
636 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
637 .begin = acpi_hibernation_begin_old,
639 .pre_snapshot = acpi_pm_pre_suspend,
640 .prepare = acpi_pm_freeze,
641 .finish = acpi_pm_finish,
642 .enter = acpi_hibernation_enter,
643 .leave = acpi_hibernation_leave,
644 .pre_restore = acpi_pm_freeze,
645 .restore_cleanup = acpi_pm_thaw,
646 .recover = acpi_pm_finish,
648 #endif /* CONFIG_HIBERNATION */
650 int acpi_suspend(u32 acpi_state)
652 suspend_state_t states[] = {
653 [1] = PM_SUSPEND_STANDBY,
654 [3] = PM_SUSPEND_MEM,
658 if (acpi_state < 6 && states[acpi_state])
659 return pm_suspend(states[acpi_state]);
667 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
668 * in the system sleep state given by %acpi_target_sleep_state
669 * @dev: device to examine; its driver model wakeup flags control
670 * whether it should be able to wake up the system
671 * @d_min_p: used to store the upper limit of allowed states range
672 * Return value: preferred power state of the device on success, -ENODEV on
673 * failure (ie. if there's no 'struct acpi_device' for @dev)
675 * Find the lowest power (highest number) ACPI device power state that
676 * device @dev can be in while the system is in the sleep state represented
677 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
678 * able to wake up the system from this sleep state. If @d_min_p is set,
679 * the highest power (lowest number) device power state of @dev allowed
680 * in this system sleep state is stored at the location pointed to by it.
682 * The caller must ensure that @dev is valid before using this function.
683 * The caller is also responsible for figuring out if the device is
684 * supposed to be able to wake up the system and passing this information
688 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
690 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
691 struct acpi_device *adev;
692 char acpi_method[] = "_SxD";
693 unsigned long long d_min, d_max;
695 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
696 printk(KERN_DEBUG "ACPI handle has no context!\n");
700 acpi_method[2] = '0' + acpi_target_sleep_state;
702 * If the sleep state is S0, we will return D3, but if the device has
703 * _S0W, we will use the value from _S0W
705 d_min = ACPI_STATE_D0;
706 d_max = ACPI_STATE_D3;
709 * If present, _SxD methods return the minimum D-state (highest power
710 * state) we can use for the corresponding S-states. Otherwise, the
711 * minimum D-state is D0 (ACPI 3.x).
713 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
714 * provided -- that's our fault recovery, we ignore retval.
716 if (acpi_target_sleep_state > ACPI_STATE_S0)
717 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
720 * If _PRW says we can wake up the system from the target sleep state,
721 * the D-state returned by _SxD is sufficient for that (we assume a
722 * wakeup-aware driver if wake is set). Still, if _SxW exists
723 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
724 * can wake the system. _S0W may be valid, too.
726 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
727 (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
728 adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
731 acpi_method[3] = 'W';
732 status = acpi_evaluate_integer(handle, acpi_method, NULL,
734 if (ACPI_FAILURE(status)) {
735 if (acpi_target_sleep_state != ACPI_STATE_S0 ||
736 status != AE_NOT_FOUND)
738 } else if (d_max < d_min) {
739 /* Warn the user of the broken DSDT */
740 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
751 #endif /* CONFIG_PM */
753 #ifdef CONFIG_PM_SLEEP
755 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
756 * capability of given device
757 * @dev: device to handle
758 * @enable: 'true' - enable, 'false' - disable the wake-up capability
760 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
763 struct acpi_device *adev;
766 if (!device_can_wakeup(dev))
769 handle = DEVICE_ACPI_HANDLE(dev);
770 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
771 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
776 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
777 acpi_disable_wakeup_device_power(adev);
779 dev_info(dev, "wake-up capability %s by ACPI\n",
780 enable ? "enabled" : "disabled");
784 #endif /* CONFIG_PM_SLEEP */
786 static void acpi_power_off_prepare(void)
788 /* Prepare to power off the system */
789 acpi_sleep_prepare(ACPI_STATE_S5);
790 acpi_disable_all_gpes();
793 static void acpi_power_off(void)
795 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
796 printk(KERN_DEBUG "%s called\n", __func__);
798 acpi_enter_sleep_state(ACPI_STATE_S5);
802 * ACPI 2.0 created the optional _GTS and _BFS,
803 * but industry adoption has been neither rapid nor broad.
805 * Linux gets into trouble when it executes poorly validated
806 * paths through the BIOS, so disable _GTS and _BFS by default,
807 * but do speak up and offer the option to enable them.
809 static void __init acpi_gts_bfs_check(void)
813 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
815 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
816 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
817 "please notify linux-acpi@vger.kernel.org\n");
819 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
821 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
822 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
823 "please notify linux-acpi@vger.kernel.org\n");
827 int __init acpi_sleep_init(void)
831 #ifdef CONFIG_SUSPEND
838 acpi_sleep_dmi_check();
840 sleep_states[ACPI_STATE_S0] = 1;
841 printk(KERN_INFO PREFIX "(supports S0");
843 #ifdef CONFIG_SUSPEND
844 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
845 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
846 if (ACPI_SUCCESS(status)) {
852 suspend_set_ops(old_suspend_ordering ?
853 &acpi_suspend_ops_old : &acpi_suspend_ops);
856 #ifdef CONFIG_HIBERNATION
857 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
858 if (ACPI_SUCCESS(status)) {
859 hibernation_set_ops(old_suspend_ordering ?
860 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
861 sleep_states[ACPI_STATE_S4] = 1;
864 acpi_get_table(ACPI_SIG_FACS, 1,
865 (struct acpi_table_header **)&facs);
867 s4_hardware_signature =
868 facs->hardware_signature;
872 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
873 if (ACPI_SUCCESS(status)) {
874 sleep_states[ACPI_STATE_S5] = 1;
876 pm_power_off_prepare = acpi_power_off_prepare;
877 pm_power_off = acpi_power_off;
881 * Register the tts_notifier to reboot notifier list so that the _TTS
882 * object can also be evaluated when the system enters S5.
884 register_reboot_notifier(&tts_notifier);
885 acpi_gts_bfs_check();