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/interrupt.h>
18 #include <linux/suspend.h>
19 #include <linux/reboot.h>
20 #include <linux/acpi.h>
21 #include <linux/module.h>
22 #include <linux/syscore_ops.h>
24 #include <trace/events/power.h>
30 * Some HW-full platforms do not have _S5, so they may need
31 * to leverage efi power off for a shutdown.
34 static u8 sleep_states[ACPI_S_STATE_COUNT];
36 static void acpi_sleep_tts_switch(u32 acpi_state)
40 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
41 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
43 * OS can't evaluate the _TTS object correctly. Some warning
44 * message will be printed. But it won't break anything.
46 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
50 static int tts_notify_reboot(struct notifier_block *this,
51 unsigned long code, void *x)
53 acpi_sleep_tts_switch(ACPI_STATE_S5);
57 static struct notifier_block tts_notifier = {
58 .notifier_call = tts_notify_reboot,
63 static int acpi_sleep_prepare(u32 acpi_state)
65 #ifdef CONFIG_ACPI_SLEEP
66 /* do we have a wakeup address for S2 and S3? */
67 if (acpi_state == ACPI_STATE_S3) {
68 if (!acpi_wakeup_address)
70 acpi_set_waking_vector(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 static bool acpi_sleep_state_supported(u8 sleep_state)
87 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
88 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
89 || (acpi_gbl_FADT.sleep_control.address
90 && acpi_gbl_FADT.sleep_status.address));
93 #ifdef CONFIG_ACPI_SLEEP
94 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
96 u32 acpi_target_system_state(void)
98 return acpi_target_sleep_state;
100 EXPORT_SYMBOL_GPL(acpi_target_system_state);
102 static bool pwr_btn_event_pending;
105 * The ACPI specification wants us to save NVS memory regions during hibernation
106 * and to restore them during the subsequent resume. Windows does that also for
107 * suspend to RAM. However, it is known that this mechanism does not work on
108 * all machines, so we allow the user to disable it with the help of the
109 * 'acpi_sleep=nonvs' kernel command line option.
111 static bool nvs_nosave;
113 void __init acpi_nvs_nosave(void)
119 * The ACPI specification wants us to save NVS memory regions during hibernation
120 * but says nothing about saving NVS during S3. Not all versions of Windows
121 * save NVS on S3 suspend either, and it is clear that not all systems need
122 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
123 * user to disable saving NVS on S3 if their system does not require it, but
124 * continue to save/restore NVS for S4 as specified.
126 static bool nvs_nosave_s3;
128 void __init acpi_nvs_nosave_s3(void)
130 nvs_nosave_s3 = true;
133 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
135 nvs_nosave_s3 = false;
140 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
141 * user to request that behavior by using the 'acpi_old_suspend_ordering'
142 * kernel command line option that causes the following variable to be set.
144 static bool old_suspend_ordering;
146 void __init acpi_old_suspend_ordering(void)
148 old_suspend_ordering = true;
151 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
153 acpi_old_suspend_ordering();
157 static int __init init_nvs_nosave(const struct dmi_system_id *d)
163 static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
165 .callback = init_old_suspend_ordering,
166 .ident = "Abit KN9 (nForce4 variant)",
168 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
169 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
173 .callback = init_old_suspend_ordering,
174 .ident = "HP xw4600 Workstation",
176 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
177 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
181 .callback = init_old_suspend_ordering,
182 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
184 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
185 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
189 .callback = init_old_suspend_ordering,
190 .ident = "Panasonic CF51-2L",
192 DMI_MATCH(DMI_BOARD_VENDOR,
193 "Matsushita Electric Industrial Co.,Ltd."),
194 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
198 .callback = init_nvs_nosave,
199 .ident = "Sony Vaio VGN-FW41E_H",
201 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
202 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
206 .callback = init_nvs_nosave,
207 .ident = "Sony Vaio VGN-FW21E",
209 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
210 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
214 .callback = init_nvs_nosave,
215 .ident = "Sony Vaio VGN-FW21M",
217 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
218 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
222 .callback = init_nvs_nosave,
223 .ident = "Sony Vaio VPCEB17FX",
225 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
226 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
230 .callback = init_nvs_nosave,
231 .ident = "Sony Vaio VGN-SR11M",
233 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
234 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
238 .callback = init_nvs_nosave,
239 .ident = "Everex StepNote Series",
241 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
242 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
246 .callback = init_nvs_nosave,
247 .ident = "Sony Vaio VPCEB1Z1E",
249 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
250 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
254 .callback = init_nvs_nosave,
255 .ident = "Sony Vaio VGN-NW130D",
257 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
258 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
262 .callback = init_nvs_nosave,
263 .ident = "Sony Vaio VPCCW29FX",
265 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
266 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
270 .callback = init_nvs_nosave,
271 .ident = "Averatec AV1020-ED2",
273 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
274 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
278 .callback = init_old_suspend_ordering,
279 .ident = "Asus A8N-SLI DELUXE",
281 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
282 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
286 .callback = init_old_suspend_ordering,
287 .ident = "Asus A8N-SLI Premium",
289 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
290 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
294 .callback = init_nvs_nosave,
295 .ident = "Sony Vaio VGN-SR26GN_P",
297 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
298 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
302 .callback = init_nvs_nosave,
303 .ident = "Sony Vaio VPCEB1S1E",
305 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
306 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
310 .callback = init_nvs_nosave,
311 .ident = "Sony Vaio VGN-FW520F",
313 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
314 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
318 .callback = init_nvs_nosave,
319 .ident = "Asus K54C",
321 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
322 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
326 .callback = init_nvs_nosave,
327 .ident = "Asus K54HR",
329 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
330 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
334 .callback = init_nvs_save_s3,
335 .ident = "Asus 1025C",
337 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
338 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
342 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
343 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
347 .callback = init_nvs_save_s3,
348 .ident = "Lenovo G50-45",
350 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
351 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
357 static void __init acpi_sleep_dmi_check(void)
361 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
362 acpi_nvs_nosave_s3();
364 dmi_check_system(acpisleep_dmi_table);
368 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
370 static int acpi_pm_freeze(void)
372 acpi_disable_all_gpes();
373 acpi_os_wait_events_complete();
374 acpi_ec_block_transactions();
379 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
381 static int acpi_pm_pre_suspend(void)
384 return suspend_nvs_save();
388 * __acpi_pm_prepare - Prepare the platform to enter the target state.
390 * If necessary, set the firmware waking vector and do arch-specific
391 * nastiness to get the wakeup code to the waking vector.
393 static int __acpi_pm_prepare(void)
395 int error = acpi_sleep_prepare(acpi_target_sleep_state);
397 acpi_target_sleep_state = ACPI_STATE_S0;
403 * acpi_pm_prepare - Prepare the platform to enter the target sleep
404 * state and disable the GPEs.
406 static int acpi_pm_prepare(void)
408 int error = __acpi_pm_prepare();
410 error = acpi_pm_pre_suspend();
415 static int find_powerf_dev(struct device *dev, void *data)
417 struct acpi_device *device = to_acpi_device(dev);
418 const char *hid = acpi_device_hid(device);
420 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
424 * acpi_pm_finish - Instruct the platform to leave a sleep state.
426 * This is called after we wake back up (or if entering the sleep state
429 static void acpi_pm_finish(void)
431 struct device *pwr_btn_dev;
432 u32 acpi_state = acpi_target_sleep_state;
434 acpi_ec_unblock_transactions();
437 if (acpi_state == ACPI_STATE_S0)
440 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
442 acpi_disable_wakeup_devices(acpi_state);
443 acpi_leave_sleep_state(acpi_state);
445 /* reset firmware waking vector */
446 acpi_set_waking_vector(0);
448 acpi_target_sleep_state = ACPI_STATE_S0;
450 acpi_resume_power_resources();
452 /* If we were woken with the fixed power button, provide a small
453 * hint to userspace in the form of a wakeup event on the fixed power
454 * button device (if it can be found).
456 * We delay the event generation til now, as the PM layer requires
457 * timekeeping to be running before we generate events. */
458 if (!pwr_btn_event_pending)
461 pwr_btn_event_pending = false;
462 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
465 pm_wakeup_event(pwr_btn_dev, 0);
466 put_device(pwr_btn_dev);
471 * acpi_pm_start - Start system PM transition.
473 static void acpi_pm_start(u32 acpi_state)
475 acpi_target_sleep_state = acpi_state;
476 acpi_sleep_tts_switch(acpi_target_sleep_state);
477 acpi_scan_lock_acquire();
481 * acpi_pm_end - Finish up system PM transition.
483 static void acpi_pm_end(void)
485 acpi_turn_off_unused_power_resources();
486 acpi_scan_lock_release();
488 * This is necessary in case acpi_pm_finish() is not called during a
489 * failing transition to a sleep state.
491 acpi_target_sleep_state = ACPI_STATE_S0;
492 acpi_sleep_tts_switch(acpi_target_sleep_state);
494 #else /* !CONFIG_ACPI_SLEEP */
495 #define acpi_target_sleep_state ACPI_STATE_S0
496 static inline void acpi_sleep_dmi_check(void) {}
497 #endif /* CONFIG_ACPI_SLEEP */
499 #ifdef CONFIG_SUSPEND
500 static u32 acpi_suspend_states[] = {
501 [PM_SUSPEND_ON] = ACPI_STATE_S0,
502 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
503 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
504 [PM_SUSPEND_MAX] = ACPI_STATE_S5
508 * acpi_suspend_begin - Set the target system sleep state to the state
509 * associated with given @pm_state, if supported.
511 static int acpi_suspend_begin(suspend_state_t pm_state)
513 u32 acpi_state = acpi_suspend_states[pm_state];
516 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
520 if (!sleep_states[acpi_state]) {
521 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
524 if (acpi_state > ACPI_STATE_S1)
525 pm_set_suspend_via_firmware();
527 acpi_pm_start(acpi_state);
532 * acpi_suspend_enter - Actually enter a sleep state.
535 * Flush caches and go to sleep. For STR we have to call arch-specific
536 * assembly, which in turn call acpi_enter_sleep_state().
537 * It's unfortunate, but it works. Please fix if you're feeling frisky.
539 static int acpi_suspend_enter(suspend_state_t pm_state)
541 acpi_status status = AE_OK;
542 u32 acpi_state = acpi_target_sleep_state;
545 ACPI_FLUSH_CPU_CACHE();
547 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
548 switch (acpi_state) {
551 status = acpi_enter_sleep_state(acpi_state);
555 if (!acpi_suspend_lowlevel)
557 error = acpi_suspend_lowlevel();
560 pr_info(PREFIX "Low-level resume complete\n");
561 pm_set_resume_via_firmware();
564 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
566 /* This violates the spec but is required for bug compatibility. */
567 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
569 /* Reprogram control registers */
570 acpi_leave_sleep_state_prep(acpi_state);
572 /* ACPI 3.0 specs (P62) says that it's the responsibility
573 * of the OSPM to clear the status bit [ implying that the
574 * POWER_BUTTON event should not reach userspace ]
576 * However, we do generate a small hint for userspace in the form of
577 * a wakeup event. We flag this condition for now and generate the
578 * event later, as we're currently too early in resume to be able to
579 * generate wakeup events.
581 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
582 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
584 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
586 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
587 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
589 pwr_btn_event_pending = true;
594 * Disable and clear GPE status before interrupt is enabled. Some GPEs
595 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
596 * acpi_leave_sleep_state will reenable specific GPEs later
598 acpi_disable_all_gpes();
599 /* Allow EC transactions to happen. */
600 acpi_ec_unblock_transactions();
602 suspend_nvs_restore();
604 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
607 static int acpi_suspend_state_valid(suspend_state_t pm_state)
613 case PM_SUSPEND_STANDBY:
615 acpi_state = acpi_suspend_states[pm_state];
617 return sleep_states[acpi_state];
623 static const struct platform_suspend_ops acpi_suspend_ops = {
624 .valid = acpi_suspend_state_valid,
625 .begin = acpi_suspend_begin,
626 .prepare_late = acpi_pm_prepare,
627 .enter = acpi_suspend_enter,
628 .wake = acpi_pm_finish,
633 * acpi_suspend_begin_old - Set the target system sleep state to the
634 * state associated with given @pm_state, if supported, and
635 * execute the _PTS control method. This function is used if the
636 * pre-ACPI 2.0 suspend ordering has been requested.
638 static int acpi_suspend_begin_old(suspend_state_t pm_state)
640 int error = acpi_suspend_begin(pm_state);
642 error = __acpi_pm_prepare();
648 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
651 static const struct platform_suspend_ops acpi_suspend_ops_old = {
652 .valid = acpi_suspend_state_valid,
653 .begin = acpi_suspend_begin_old,
654 .prepare_late = acpi_pm_pre_suspend,
655 .enter = acpi_suspend_enter,
656 .wake = acpi_pm_finish,
658 .recover = acpi_pm_finish,
661 static int acpi_freeze_begin(void)
663 acpi_scan_lock_acquire();
667 static int acpi_freeze_prepare(void)
669 acpi_enable_wakeup_devices(ACPI_STATE_S0);
670 acpi_enable_all_wakeup_gpes();
671 acpi_os_wait_events_complete();
672 if (acpi_sci_irq_valid())
673 enable_irq_wake(acpi_sci_irq);
677 static void acpi_freeze_restore(void)
679 acpi_disable_wakeup_devices(ACPI_STATE_S0);
680 if (acpi_sci_irq_valid())
681 disable_irq_wake(acpi_sci_irq);
682 acpi_enable_all_runtime_gpes();
685 static void acpi_freeze_end(void)
687 acpi_scan_lock_release();
690 static const struct platform_freeze_ops acpi_freeze_ops = {
691 .begin = acpi_freeze_begin,
692 .prepare = acpi_freeze_prepare,
693 .restore = acpi_freeze_restore,
694 .end = acpi_freeze_end,
697 static void acpi_sleep_suspend_setup(void)
701 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
702 if (acpi_sleep_state_supported(i))
705 suspend_set_ops(old_suspend_ordering ?
706 &acpi_suspend_ops_old : &acpi_suspend_ops);
707 freeze_set_ops(&acpi_freeze_ops);
710 #else /* !CONFIG_SUSPEND */
711 static inline void acpi_sleep_suspend_setup(void) {}
712 #endif /* !CONFIG_SUSPEND */
714 #ifdef CONFIG_PM_SLEEP
715 static u32 saved_bm_rld;
717 static int acpi_save_bm_rld(void)
719 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
723 static void acpi_restore_bm_rld(void)
725 u32 resumed_bm_rld = 0;
727 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
728 if (resumed_bm_rld == saved_bm_rld)
731 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
734 static struct syscore_ops acpi_sleep_syscore_ops = {
735 .suspend = acpi_save_bm_rld,
736 .resume = acpi_restore_bm_rld,
739 void acpi_sleep_syscore_init(void)
741 register_syscore_ops(&acpi_sleep_syscore_ops);
744 static inline void acpi_sleep_syscore_init(void) {}
745 #endif /* CONFIG_PM_SLEEP */
747 #ifdef CONFIG_HIBERNATION
748 static unsigned long s4_hardware_signature;
749 static struct acpi_table_facs *facs;
750 static bool nosigcheck;
752 void __init acpi_no_s4_hw_signature(void)
757 static int acpi_hibernation_begin(void)
761 error = nvs_nosave ? 0 : suspend_nvs_alloc();
763 acpi_pm_start(ACPI_STATE_S4);
768 static int acpi_hibernation_enter(void)
770 acpi_status status = AE_OK;
772 ACPI_FLUSH_CPU_CACHE();
774 /* This shouldn't return. If it returns, we have a problem */
775 status = acpi_enter_sleep_state(ACPI_STATE_S4);
776 /* Reprogram control registers */
777 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
779 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
782 static void acpi_hibernation_leave(void)
784 pm_set_resume_via_firmware();
786 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
790 /* Reprogram control registers */
791 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
792 /* Check the hardware signature */
793 if (facs && s4_hardware_signature != facs->hardware_signature)
794 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
795 /* Restore the NVS memory area */
796 suspend_nvs_restore();
797 /* Allow EC transactions to happen. */
798 acpi_ec_unblock_transactions();
801 static void acpi_pm_thaw(void)
803 acpi_ec_unblock_transactions();
804 acpi_enable_all_runtime_gpes();
807 static const struct platform_hibernation_ops acpi_hibernation_ops = {
808 .begin = acpi_hibernation_begin,
810 .pre_snapshot = acpi_pm_prepare,
811 .finish = acpi_pm_finish,
812 .prepare = acpi_pm_prepare,
813 .enter = acpi_hibernation_enter,
814 .leave = acpi_hibernation_leave,
815 .pre_restore = acpi_pm_freeze,
816 .restore_cleanup = acpi_pm_thaw,
820 * acpi_hibernation_begin_old - Set the target system sleep state to
821 * ACPI_STATE_S4 and execute the _PTS control method. This
822 * function is used if the pre-ACPI 2.0 suspend ordering has been
825 static int acpi_hibernation_begin_old(void)
829 * The _TTS object should always be evaluated before the _PTS object.
830 * When the old_suspended_ordering is true, the _PTS object is
831 * evaluated in the acpi_sleep_prepare.
833 acpi_sleep_tts_switch(ACPI_STATE_S4);
835 error = acpi_sleep_prepare(ACPI_STATE_S4);
839 error = suspend_nvs_alloc();
841 acpi_target_sleep_state = ACPI_STATE_S4;
842 acpi_scan_lock_acquire();
849 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
852 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
853 .begin = acpi_hibernation_begin_old,
855 .pre_snapshot = acpi_pm_pre_suspend,
856 .prepare = acpi_pm_freeze,
857 .finish = acpi_pm_finish,
858 .enter = acpi_hibernation_enter,
859 .leave = acpi_hibernation_leave,
860 .pre_restore = acpi_pm_freeze,
861 .restore_cleanup = acpi_pm_thaw,
862 .recover = acpi_pm_finish,
865 static void acpi_sleep_hibernate_setup(void)
867 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
870 hibernation_set_ops(old_suspend_ordering ?
871 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
872 sleep_states[ACPI_STATE_S4] = 1;
876 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
878 s4_hardware_signature = facs->hardware_signature;
880 #else /* !CONFIG_HIBERNATION */
881 static inline void acpi_sleep_hibernate_setup(void) {}
882 #endif /* !CONFIG_HIBERNATION */
884 static void acpi_power_off_prepare(void)
886 /* Prepare to power off the system */
887 acpi_sleep_prepare(ACPI_STATE_S5);
888 acpi_disable_all_gpes();
889 acpi_os_wait_events_complete();
892 static void acpi_power_off(void)
894 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
895 printk(KERN_DEBUG "%s called\n", __func__);
897 acpi_enter_sleep_state(ACPI_STATE_S5);
900 int __init acpi_sleep_init(void)
902 char supported[ACPI_S_STATE_COUNT * 3 + 1];
903 char *pos = supported;
906 acpi_sleep_dmi_check();
908 sleep_states[ACPI_STATE_S0] = 1;
910 acpi_sleep_syscore_init();
911 acpi_sleep_suspend_setup();
912 acpi_sleep_hibernate_setup();
914 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
915 sleep_states[ACPI_STATE_S5] = 1;
916 pm_power_off_prepare = acpi_power_off_prepare;
917 pm_power_off = acpi_power_off;
923 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
925 pos += sprintf(pos, " S%d", i);
927 pr_info(PREFIX "(supports%s)\n", supported);
930 * Register the tts_notifier to reboot notifier list so that the _TTS
931 * object can also be evaluated when the system enters S5.
933 register_reboot_notifier(&tts_notifier);