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;
112 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
114 static int acpi_pm_freeze(void)
116 acpi_disable_all_gpes();
117 acpi_os_wait_events_complete(NULL);
118 acpi_ec_block_transactions();
123 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
125 static int acpi_pm_pre_suspend(void)
128 return suspend_nvs_save();
132 * __acpi_pm_prepare - Prepare the platform to enter the target state.
134 * If necessary, set the firmware waking vector and do arch-specific
135 * nastiness to get the wakeup code to the waking vector.
137 static int __acpi_pm_prepare(void)
139 int error = acpi_sleep_prepare(acpi_target_sleep_state);
141 acpi_target_sleep_state = ACPI_STATE_S0;
147 * acpi_pm_prepare - Prepare the platform to enter the target sleep
148 * state and disable the GPEs.
150 static int acpi_pm_prepare(void)
152 int error = __acpi_pm_prepare();
154 error = acpi_pm_pre_suspend();
160 * acpi_pm_finish - Instruct the platform to leave a sleep state.
162 * This is called after we wake back up (or if entering the sleep state
165 static void acpi_pm_finish(void)
167 u32 acpi_state = acpi_target_sleep_state;
169 acpi_ec_unblock_transactions();
172 if (acpi_state == ACPI_STATE_S0)
175 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
177 acpi_disable_wakeup_devices(acpi_state);
178 acpi_leave_sleep_state(acpi_state);
180 /* reset firmware waking vector */
181 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
183 acpi_target_sleep_state = ACPI_STATE_S0;
187 * acpi_pm_end - Finish up suspend sequence.
189 static void acpi_pm_end(void)
192 * This is necessary in case acpi_pm_finish() is not called during a
193 * failing transition to a sleep state.
195 acpi_target_sleep_state = ACPI_STATE_S0;
196 acpi_sleep_tts_switch(acpi_target_sleep_state);
198 #else /* !CONFIG_ACPI_SLEEP */
199 #define acpi_target_sleep_state ACPI_STATE_S0
200 #endif /* CONFIG_ACPI_SLEEP */
202 #ifdef CONFIG_SUSPEND
203 static u32 acpi_suspend_states[] = {
204 [PM_SUSPEND_ON] = ACPI_STATE_S0,
205 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
206 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
207 [PM_SUSPEND_MAX] = ACPI_STATE_S5
211 * acpi_suspend_begin - Set the target system sleep state to the state
212 * associated with given @pm_state, if supported.
214 static int acpi_suspend_begin(suspend_state_t pm_state)
216 u32 acpi_state = acpi_suspend_states[pm_state];
219 error = nvs_nosave ? 0 : suspend_nvs_alloc();
223 if (sleep_states[acpi_state]) {
224 acpi_target_sleep_state = acpi_state;
225 acpi_sleep_tts_switch(acpi_target_sleep_state);
227 printk(KERN_ERR "ACPI does not support this state: %d\n",
235 * acpi_suspend_enter - Actually enter a sleep state.
238 * Flush caches and go to sleep. For STR we have to call arch-specific
239 * assembly, which in turn call acpi_enter_sleep_state().
240 * It's unfortunate, but it works. Please fix if you're feeling frisky.
242 static int acpi_suspend_enter(suspend_state_t pm_state)
244 acpi_status status = AE_OK;
245 u32 acpi_state = acpi_target_sleep_state;
248 ACPI_FLUSH_CPU_CACHE();
250 switch (acpi_state) {
253 status = acpi_enter_sleep_state(acpi_state);
257 error = acpi_suspend_lowlevel();
260 pr_info(PREFIX "Low-level resume complete\n");
264 /* This violates the spec but is required for bug compatibility. */
265 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
267 /* Reprogram control registers and execute _BFS */
268 acpi_leave_sleep_state_prep(acpi_state);
270 /* ACPI 3.0 specs (P62) says that it's the responsibility
271 * of the OSPM to clear the status bit [ implying that the
272 * POWER_BUTTON event should not reach userspace ]
274 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
275 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
278 * Disable and clear GPE status before interrupt is enabled. Some GPEs
279 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
280 * acpi_leave_sleep_state will reenable specific GPEs later
282 acpi_disable_all_gpes();
283 /* Allow EC transactions to happen. */
284 acpi_ec_unblock_transactions_early();
286 suspend_nvs_restore();
288 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
291 static int acpi_suspend_state_valid(suspend_state_t pm_state)
297 case PM_SUSPEND_STANDBY:
299 acpi_state = acpi_suspend_states[pm_state];
301 return sleep_states[acpi_state];
307 static const struct platform_suspend_ops acpi_suspend_ops = {
308 .valid = acpi_suspend_state_valid,
309 .begin = acpi_suspend_begin,
310 .prepare_late = acpi_pm_prepare,
311 .enter = acpi_suspend_enter,
312 .wake = acpi_pm_finish,
317 * acpi_suspend_begin_old - Set the target system sleep state to the
318 * state associated with given @pm_state, if supported, and
319 * execute the _PTS control method. This function is used if the
320 * pre-ACPI 2.0 suspend ordering has been requested.
322 static int acpi_suspend_begin_old(suspend_state_t pm_state)
324 int error = acpi_suspend_begin(pm_state);
326 error = __acpi_pm_prepare();
332 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
335 static const struct platform_suspend_ops acpi_suspend_ops_old = {
336 .valid = acpi_suspend_state_valid,
337 .begin = acpi_suspend_begin_old,
338 .prepare_late = acpi_pm_pre_suspend,
339 .enter = acpi_suspend_enter,
340 .wake = acpi_pm_finish,
342 .recover = acpi_pm_finish,
345 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
347 old_suspend_ordering = true;
351 static int __init init_nvs_nosave(const struct dmi_system_id *d)
357 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
359 .callback = init_old_suspend_ordering,
360 .ident = "Abit KN9 (nForce4 variant)",
362 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
363 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
367 .callback = init_old_suspend_ordering,
368 .ident = "HP xw4600 Workstation",
370 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
371 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
375 .callback = init_old_suspend_ordering,
376 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
378 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
379 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
383 .callback = init_old_suspend_ordering,
384 .ident = "Panasonic CF51-2L",
386 DMI_MATCH(DMI_BOARD_VENDOR,
387 "Matsushita Electric Industrial Co.,Ltd."),
388 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
392 .callback = init_nvs_nosave,
393 .ident = "Sony Vaio VGN-FW21E",
395 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
396 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
400 .callback = init_nvs_nosave,
401 .ident = "Sony Vaio VPCEB17FX",
403 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
404 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
408 .callback = init_nvs_nosave,
409 .ident = "Sony Vaio VGN-SR11M",
411 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
412 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
416 .callback = init_nvs_nosave,
417 .ident = "Everex StepNote Series",
419 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
420 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
424 .callback = init_nvs_nosave,
425 .ident = "Sony Vaio VPCEB1Z1E",
427 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
428 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
432 .callback = init_nvs_nosave,
433 .ident = "Sony Vaio VGN-NW130D",
435 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
436 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
440 .callback = init_nvs_nosave,
441 .ident = "Sony Vaio VPCCW29FX",
443 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
444 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
448 .callback = init_nvs_nosave,
449 .ident = "Averatec AV1020-ED2",
451 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
452 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
456 .callback = init_old_suspend_ordering,
457 .ident = "Asus A8N-SLI DELUXE",
459 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
460 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
464 .callback = init_old_suspend_ordering,
465 .ident = "Asus A8N-SLI Premium",
467 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
468 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
472 .callback = init_nvs_nosave,
473 .ident = "Sony Vaio VGN-SR26GN_P",
475 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
476 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
480 .callback = init_nvs_nosave,
481 .ident = "Sony Vaio VPCEB1S1E",
483 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
484 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
488 .callback = init_nvs_nosave,
489 .ident = "Sony Vaio VGN-FW520F",
491 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
492 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
496 .callback = init_nvs_nosave,
497 .ident = "Asus K54C",
499 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
500 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
504 .callback = init_nvs_nosave,
505 .ident = "Asus K54HR",
507 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
508 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
513 #endif /* CONFIG_SUSPEND */
515 #ifdef CONFIG_HIBERNATION
516 static unsigned long s4_hardware_signature;
517 static struct acpi_table_facs *facs;
518 static bool nosigcheck;
520 void __init acpi_no_s4_hw_signature(void)
525 static int acpi_hibernation_begin(void)
529 error = nvs_nosave ? 0 : suspend_nvs_alloc();
531 acpi_target_sleep_state = ACPI_STATE_S4;
532 acpi_sleep_tts_switch(acpi_target_sleep_state);
538 static int acpi_hibernation_enter(void)
540 acpi_status status = AE_OK;
542 ACPI_FLUSH_CPU_CACHE();
544 /* This shouldn't return. If it returns, we have a problem */
545 status = acpi_enter_sleep_state(ACPI_STATE_S4);
546 /* Reprogram control registers and execute _BFS */
547 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
549 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
552 static void acpi_hibernation_leave(void)
555 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
559 /* Reprogram control registers and execute _BFS */
560 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
561 /* Check the hardware signature */
562 if (facs && s4_hardware_signature != facs->hardware_signature) {
563 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
565 panic("ACPI S4 hardware signature mismatch");
567 /* Restore the NVS memory area */
568 suspend_nvs_restore();
569 /* Allow EC transactions to happen. */
570 acpi_ec_unblock_transactions_early();
573 static void acpi_pm_thaw(void)
575 acpi_ec_unblock_transactions();
576 acpi_enable_all_runtime_gpes();
579 static const struct platform_hibernation_ops acpi_hibernation_ops = {
580 .begin = acpi_hibernation_begin,
582 .pre_snapshot = acpi_pm_prepare,
583 .finish = acpi_pm_finish,
584 .prepare = acpi_pm_prepare,
585 .enter = acpi_hibernation_enter,
586 .leave = acpi_hibernation_leave,
587 .pre_restore = acpi_pm_freeze,
588 .restore_cleanup = acpi_pm_thaw,
592 * acpi_hibernation_begin_old - Set the target system sleep state to
593 * ACPI_STATE_S4 and execute the _PTS control method. This
594 * function is used if the pre-ACPI 2.0 suspend ordering has been
597 static int acpi_hibernation_begin_old(void)
601 * The _TTS object should always be evaluated before the _PTS object.
602 * When the old_suspended_ordering is true, the _PTS object is
603 * evaluated in the acpi_sleep_prepare.
605 acpi_sleep_tts_switch(ACPI_STATE_S4);
607 error = acpi_sleep_prepare(ACPI_STATE_S4);
611 error = suspend_nvs_alloc();
613 acpi_target_sleep_state = ACPI_STATE_S4;
619 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
622 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
623 .begin = acpi_hibernation_begin_old,
625 .pre_snapshot = acpi_pm_pre_suspend,
626 .prepare = acpi_pm_freeze,
627 .finish = acpi_pm_finish,
628 .enter = acpi_hibernation_enter,
629 .leave = acpi_hibernation_leave,
630 .pre_restore = acpi_pm_freeze,
631 .restore_cleanup = acpi_pm_thaw,
632 .recover = acpi_pm_finish,
634 #endif /* CONFIG_HIBERNATION */
636 int acpi_suspend(u32 acpi_state)
638 suspend_state_t states[] = {
639 [1] = PM_SUSPEND_STANDBY,
640 [3] = PM_SUSPEND_MEM,
644 if (acpi_state < 6 && states[acpi_state])
645 return pm_suspend(states[acpi_state]);
653 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
654 * in the system sleep state given by %acpi_target_sleep_state
655 * @dev: device to examine; its driver model wakeup flags control
656 * whether it should be able to wake up the system
657 * @d_min_p: used to store the upper limit of allowed states range
658 * Return value: preferred power state of the device on success, -ENODEV on
659 * failure (ie. if there's no 'struct acpi_device' for @dev)
661 * Find the lowest power (highest number) ACPI device power state that
662 * device @dev can be in while the system is in the sleep state represented
663 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
664 * able to wake up the system from this sleep state. If @d_min_p is set,
665 * the highest power (lowest number) device power state of @dev allowed
666 * in this system sleep state is stored at the location pointed to by it.
668 * The caller must ensure that @dev is valid before using this function.
669 * The caller is also responsible for figuring out if the device is
670 * supposed to be able to wake up the system and passing this information
674 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
676 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
677 struct acpi_device *adev;
678 char acpi_method[] = "_SxD";
679 unsigned long long d_min, d_max;
681 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
682 printk(KERN_DEBUG "ACPI handle has no context!\n");
686 acpi_method[2] = '0' + acpi_target_sleep_state;
688 * If the sleep state is S0, we will return D3, but if the device has
689 * _S0W, we will use the value from _S0W
691 d_min = ACPI_STATE_D0;
692 d_max = ACPI_STATE_D3;
695 * If present, _SxD methods return the minimum D-state (highest power
696 * state) we can use for the corresponding S-states. Otherwise, the
697 * minimum D-state is D0 (ACPI 3.x).
699 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
700 * provided -- that's our fault recovery, we ignore retval.
702 if (acpi_target_sleep_state > ACPI_STATE_S0)
703 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
706 * If _PRW says we can wake up the system from the target sleep state,
707 * the D-state returned by _SxD is sufficient for that (we assume a
708 * wakeup-aware driver if wake is set). Still, if _SxW exists
709 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
710 * can wake the system. _S0W may be valid, too.
712 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
713 (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
714 adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
717 acpi_method[3] = 'W';
718 status = acpi_evaluate_integer(handle, acpi_method, NULL,
720 if (ACPI_FAILURE(status)) {
721 if (acpi_target_sleep_state != ACPI_STATE_S0 ||
722 status != AE_NOT_FOUND)
724 } else if (d_max < d_min) {
725 /* Warn the user of the broken DSDT */
726 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
737 #endif /* CONFIG_PM */
739 #ifdef CONFIG_PM_SLEEP
741 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
742 * capability of given device
743 * @dev: device to handle
744 * @enable: 'true' - enable, 'false' - disable the wake-up capability
746 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
749 struct acpi_device *adev;
752 if (!device_can_wakeup(dev))
755 handle = DEVICE_ACPI_HANDLE(dev);
756 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
757 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
762 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
763 acpi_disable_wakeup_device_power(adev);
765 dev_info(dev, "wake-up capability %s by ACPI\n",
766 enable ? "enabled" : "disabled");
770 #endif /* CONFIG_PM_SLEEP */
772 static void acpi_power_off_prepare(void)
774 /* Prepare to power off the system */
775 acpi_sleep_prepare(ACPI_STATE_S5);
776 acpi_disable_all_gpes();
779 static void acpi_power_off(void)
781 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
782 printk(KERN_DEBUG "%s called\n", __func__);
784 acpi_enter_sleep_state(ACPI_STATE_S5);
788 * ACPI 2.0 created the optional _GTS and _BFS,
789 * but industry adoption has been neither rapid nor broad.
791 * Linux gets into trouble when it executes poorly validated
792 * paths through the BIOS, so disable _GTS and _BFS by default,
793 * but do speak up and offer the option to enable them.
795 static void __init acpi_gts_bfs_check(void)
799 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
801 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
802 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
803 "please notify linux-acpi@vger.kernel.org\n");
805 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
807 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
808 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
809 "please notify linux-acpi@vger.kernel.org\n");
813 int __init acpi_sleep_init(void)
817 #ifdef CONFIG_SUSPEND
820 dmi_check_system(acpisleep_dmi_table);
826 sleep_states[ACPI_STATE_S0] = 1;
827 printk(KERN_INFO PREFIX "(supports S0");
829 #ifdef CONFIG_SUSPEND
830 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
831 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
832 if (ACPI_SUCCESS(status)) {
838 suspend_set_ops(old_suspend_ordering ?
839 &acpi_suspend_ops_old : &acpi_suspend_ops);
842 #ifdef CONFIG_HIBERNATION
843 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
844 if (ACPI_SUCCESS(status)) {
845 hibernation_set_ops(old_suspend_ordering ?
846 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
847 sleep_states[ACPI_STATE_S4] = 1;
850 acpi_get_table(ACPI_SIG_FACS, 1,
851 (struct acpi_table_header **)&facs);
853 s4_hardware_signature =
854 facs->hardware_signature;
858 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
859 if (ACPI_SUCCESS(status)) {
860 sleep_states[ACPI_STATE_S5] = 1;
862 pm_power_off_prepare = acpi_power_off_prepare;
863 pm_power_off = acpi_power_off;
867 * Register the tts_notifier to reboot notifier list so that the _TTS
868 * object can also be evaluated when the system enters S5.
870 register_reboot_notifier(&tts_notifier);
871 acpi_gts_bfs_check();