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 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
335 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
339 .callback = init_nvs_save_s3,
340 .ident = "Lenovo G50-45",
342 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
343 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
349 static void __init acpi_sleep_dmi_check(void)
353 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
354 acpi_nvs_nosave_s3();
356 dmi_check_system(acpisleep_dmi_table);
360 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
362 static int acpi_pm_freeze(void)
364 acpi_disable_all_gpes();
365 acpi_os_wait_events_complete();
366 acpi_ec_block_transactions();
371 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
373 static int acpi_pm_pre_suspend(void)
376 return suspend_nvs_save();
380 * __acpi_pm_prepare - Prepare the platform to enter the target state.
382 * If necessary, set the firmware waking vector and do arch-specific
383 * nastiness to get the wakeup code to the waking vector.
385 static int __acpi_pm_prepare(void)
387 int error = acpi_sleep_prepare(acpi_target_sleep_state);
389 acpi_target_sleep_state = ACPI_STATE_S0;
395 * acpi_pm_prepare - Prepare the platform to enter the target sleep
396 * state and disable the GPEs.
398 static int acpi_pm_prepare(void)
400 int error = __acpi_pm_prepare();
402 error = acpi_pm_pre_suspend();
407 static int find_powerf_dev(struct device *dev, void *data)
409 struct acpi_device *device = to_acpi_device(dev);
410 const char *hid = acpi_device_hid(device);
412 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
416 * acpi_pm_finish - Instruct the platform to leave a sleep state.
418 * This is called after we wake back up (or if entering the sleep state
421 static void acpi_pm_finish(void)
423 struct device *pwr_btn_dev;
424 u32 acpi_state = acpi_target_sleep_state;
426 acpi_ec_unblock_transactions();
429 if (acpi_state == ACPI_STATE_S0)
432 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
434 acpi_disable_wakeup_devices(acpi_state);
435 acpi_leave_sleep_state(acpi_state);
437 /* reset firmware waking vector */
438 acpi_set_waking_vector(0);
440 acpi_target_sleep_state = ACPI_STATE_S0;
442 acpi_resume_power_resources();
444 /* If we were woken with the fixed power button, provide a small
445 * hint to userspace in the form of a wakeup event on the fixed power
446 * button device (if it can be found).
448 * We delay the event generation til now, as the PM layer requires
449 * timekeeping to be running before we generate events. */
450 if (!pwr_btn_event_pending)
453 pwr_btn_event_pending = false;
454 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
457 pm_wakeup_event(pwr_btn_dev, 0);
458 put_device(pwr_btn_dev);
463 * acpi_pm_start - Start system PM transition.
465 static void acpi_pm_start(u32 acpi_state)
467 acpi_target_sleep_state = acpi_state;
468 acpi_sleep_tts_switch(acpi_target_sleep_state);
469 acpi_scan_lock_acquire();
473 * acpi_pm_end - Finish up system PM transition.
475 static void acpi_pm_end(void)
477 acpi_turn_off_unused_power_resources();
478 acpi_scan_lock_release();
480 * This is necessary in case acpi_pm_finish() is not called during a
481 * failing transition to a sleep state.
483 acpi_target_sleep_state = ACPI_STATE_S0;
484 acpi_sleep_tts_switch(acpi_target_sleep_state);
486 #else /* !CONFIG_ACPI_SLEEP */
487 #define acpi_target_sleep_state ACPI_STATE_S0
488 static inline void acpi_sleep_dmi_check(void) {}
489 #endif /* CONFIG_ACPI_SLEEP */
491 #ifdef CONFIG_SUSPEND
492 static u32 acpi_suspend_states[] = {
493 [PM_SUSPEND_ON] = ACPI_STATE_S0,
494 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
495 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
496 [PM_SUSPEND_MAX] = ACPI_STATE_S5
500 * acpi_suspend_begin - Set the target system sleep state to the state
501 * associated with given @pm_state, if supported.
503 static int acpi_suspend_begin(suspend_state_t pm_state)
505 u32 acpi_state = acpi_suspend_states[pm_state];
508 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
512 if (!sleep_states[acpi_state]) {
513 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
516 if (acpi_state > ACPI_STATE_S1)
517 pm_set_suspend_via_firmware();
519 acpi_pm_start(acpi_state);
524 * acpi_suspend_enter - Actually enter a sleep state.
527 * Flush caches and go to sleep. For STR we have to call arch-specific
528 * assembly, which in turn call acpi_enter_sleep_state().
529 * It's unfortunate, but it works. Please fix if you're feeling frisky.
531 static int acpi_suspend_enter(suspend_state_t pm_state)
533 acpi_status status = AE_OK;
534 u32 acpi_state = acpi_target_sleep_state;
537 ACPI_FLUSH_CPU_CACHE();
539 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
540 switch (acpi_state) {
543 status = acpi_enter_sleep_state(acpi_state);
547 if (!acpi_suspend_lowlevel)
549 error = acpi_suspend_lowlevel();
552 pr_info(PREFIX "Low-level resume complete\n");
553 pm_set_resume_via_firmware();
556 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
558 /* This violates the spec but is required for bug compatibility. */
559 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
561 /* Reprogram control registers */
562 acpi_leave_sleep_state_prep(acpi_state);
564 /* ACPI 3.0 specs (P62) says that it's the responsibility
565 * of the OSPM to clear the status bit [ implying that the
566 * POWER_BUTTON event should not reach userspace ]
568 * However, we do generate a small hint for userspace in the form of
569 * a wakeup event. We flag this condition for now and generate the
570 * event later, as we're currently too early in resume to be able to
571 * generate wakeup events.
573 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
574 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
576 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
578 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
579 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
581 pwr_btn_event_pending = true;
586 * Disable and clear GPE status before interrupt is enabled. Some GPEs
587 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
588 * acpi_leave_sleep_state will reenable specific GPEs later
590 acpi_disable_all_gpes();
591 /* Allow EC transactions to happen. */
592 acpi_ec_unblock_transactions();
594 suspend_nvs_restore();
596 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
599 static int acpi_suspend_state_valid(suspend_state_t pm_state)
605 case PM_SUSPEND_STANDBY:
607 acpi_state = acpi_suspend_states[pm_state];
609 return sleep_states[acpi_state];
615 static const struct platform_suspend_ops acpi_suspend_ops = {
616 .valid = acpi_suspend_state_valid,
617 .begin = acpi_suspend_begin,
618 .prepare_late = acpi_pm_prepare,
619 .enter = acpi_suspend_enter,
620 .wake = acpi_pm_finish,
625 * acpi_suspend_begin_old - Set the target system sleep state to the
626 * state associated with given @pm_state, if supported, and
627 * execute the _PTS control method. This function is used if the
628 * pre-ACPI 2.0 suspend ordering has been requested.
630 static int acpi_suspend_begin_old(suspend_state_t pm_state)
632 int error = acpi_suspend_begin(pm_state);
634 error = __acpi_pm_prepare();
640 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
643 static const struct platform_suspend_ops acpi_suspend_ops_old = {
644 .valid = acpi_suspend_state_valid,
645 .begin = acpi_suspend_begin_old,
646 .prepare_late = acpi_pm_pre_suspend,
647 .enter = acpi_suspend_enter,
648 .wake = acpi_pm_finish,
650 .recover = acpi_pm_finish,
653 static bool s2idle_in_progress;
654 static bool s2idle_wakeup;
657 * On platforms supporting the Low Power S0 Idle interface there is an ACPI
658 * device object with the PNP0D80 compatible device ID (System Power Management
659 * Controller) and a specific _DSM method under it. That method, if present,
660 * can be used to indicate to the platform that the OS is transitioning into a
661 * low-power state in which certain types of activity are not desirable or that
662 * it is leaving such a state, which allows the platform to adjust its operation
665 static const struct acpi_device_id lps0_device_ids[] = {
670 #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
672 #define ACPI_LPS0_SCREEN_OFF 3
673 #define ACPI_LPS0_SCREEN_ON 4
674 #define ACPI_LPS0_ENTRY 5
675 #define ACPI_LPS0_EXIT 6
677 #define ACPI_S2IDLE_FUNC_MASK ((1 << ACPI_LPS0_ENTRY) | (1 << ACPI_LPS0_EXIT))
679 static acpi_handle lps0_device_handle;
680 static guid_t lps0_dsm_guid;
681 static char lps0_dsm_func_mask;
683 static void acpi_sleep_run_lps0_dsm(unsigned int func)
685 union acpi_object *out_obj;
687 if (!(lps0_dsm_func_mask & (1 << func)))
690 out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
693 acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
694 func, out_obj ? "successful" : "failed");
697 static int lps0_device_attach(struct acpi_device *adev,
698 const struct acpi_device_id *not_used)
700 union acpi_object *out_obj;
702 if (lps0_device_handle)
705 if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
708 guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
709 /* Check if the _DSM is present and as expected. */
710 out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
711 if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
712 char bitmask = *(char *)out_obj->buffer.pointer;
714 if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) {
715 lps0_dsm_func_mask = bitmask;
716 lps0_device_handle = adev->handle;
719 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
722 acpi_handle_debug(adev->handle,
723 "_DSM function 0 evaluation failed\n");
729 static struct acpi_scan_handler lps0_handler = {
730 .ids = lps0_device_ids,
731 .attach = lps0_device_attach,
734 static int acpi_freeze_begin(void)
736 acpi_scan_lock_acquire();
737 s2idle_in_progress = true;
741 static int acpi_freeze_prepare(void)
743 if (lps0_device_handle) {
744 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
745 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
748 * The configuration of GPEs is changed here to avoid spurious
749 * wakeups, but that should not be necessary if this is a
750 * "low-power S0" platform and the low-power S0 _DSM is present.
752 acpi_enable_all_wakeup_gpes();
753 acpi_os_wait_events_complete();
755 if (acpi_sci_irq_valid())
756 enable_irq_wake(acpi_sci_irq);
761 static void acpi_freeze_wake(void)
764 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
765 * that the SCI has triggered while suspended, so cancel the wakeup in
766 * case it has not been a wakeup event (the GPEs will be checked later).
768 if (acpi_sci_irq_valid() &&
769 !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
770 pm_system_cancel_wakeup();
771 s2idle_wakeup = true;
775 static void acpi_freeze_sync(void)
778 * Process all pending events in case there are any wakeup ones.
780 * The EC driver uses the system workqueue and an additional special
781 * one, so those need to be flushed too.
783 acpi_ec_flush_work();
784 acpi_os_wait_events_complete();
785 s2idle_wakeup = false;
788 static void acpi_freeze_restore(void)
790 if (acpi_sci_irq_valid())
791 disable_irq_wake(acpi_sci_irq);
793 if (lps0_device_handle) {
794 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
795 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
797 acpi_enable_all_runtime_gpes();
801 static void acpi_freeze_end(void)
803 s2idle_in_progress = false;
804 acpi_scan_lock_release();
807 static const struct platform_freeze_ops acpi_freeze_ops = {
808 .begin = acpi_freeze_begin,
809 .prepare = acpi_freeze_prepare,
810 .wake = acpi_freeze_wake,
811 .sync = acpi_freeze_sync,
812 .restore = acpi_freeze_restore,
813 .end = acpi_freeze_end,
816 static void acpi_sleep_suspend_setup(void)
820 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
821 if (acpi_sleep_state_supported(i))
824 suspend_set_ops(old_suspend_ordering ?
825 &acpi_suspend_ops_old : &acpi_suspend_ops);
827 acpi_scan_add_handler(&lps0_handler);
828 freeze_set_ops(&acpi_freeze_ops);
831 #else /* !CONFIG_SUSPEND */
832 #define s2idle_in_progress (false)
833 #define s2idle_wakeup (false)
834 #define lps0_device_handle (NULL)
835 static inline void acpi_sleep_suspend_setup(void) {}
836 #endif /* !CONFIG_SUSPEND */
838 bool acpi_s2idle_wakeup(void)
840 return s2idle_wakeup;
843 bool acpi_sleep_no_ec_events(void)
845 return !s2idle_in_progress || !lps0_device_handle;
848 #ifdef CONFIG_PM_SLEEP
849 static u32 saved_bm_rld;
851 static int acpi_save_bm_rld(void)
853 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
857 static void acpi_restore_bm_rld(void)
859 u32 resumed_bm_rld = 0;
861 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
862 if (resumed_bm_rld == saved_bm_rld)
865 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
868 static struct syscore_ops acpi_sleep_syscore_ops = {
869 .suspend = acpi_save_bm_rld,
870 .resume = acpi_restore_bm_rld,
873 void acpi_sleep_syscore_init(void)
875 register_syscore_ops(&acpi_sleep_syscore_ops);
878 static inline void acpi_sleep_syscore_init(void) {}
879 #endif /* CONFIG_PM_SLEEP */
881 #ifdef CONFIG_HIBERNATION
882 static unsigned long s4_hardware_signature;
883 static struct acpi_table_facs *facs;
884 static bool nosigcheck;
886 void __init acpi_no_s4_hw_signature(void)
891 static int acpi_hibernation_begin(void)
895 error = nvs_nosave ? 0 : suspend_nvs_alloc();
897 acpi_pm_start(ACPI_STATE_S4);
902 static int acpi_hibernation_enter(void)
904 acpi_status status = AE_OK;
906 ACPI_FLUSH_CPU_CACHE();
908 /* This shouldn't return. If it returns, we have a problem */
909 status = acpi_enter_sleep_state(ACPI_STATE_S4);
910 /* Reprogram control registers */
911 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
913 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
916 static void acpi_hibernation_leave(void)
918 pm_set_resume_via_firmware();
920 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
924 /* Reprogram control registers */
925 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
926 /* Check the hardware signature */
927 if (facs && s4_hardware_signature != facs->hardware_signature)
928 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
929 /* Restore the NVS memory area */
930 suspend_nvs_restore();
931 /* Allow EC transactions to happen. */
932 acpi_ec_unblock_transactions();
935 static void acpi_pm_thaw(void)
937 acpi_ec_unblock_transactions();
938 acpi_enable_all_runtime_gpes();
941 static const struct platform_hibernation_ops acpi_hibernation_ops = {
942 .begin = acpi_hibernation_begin,
944 .pre_snapshot = acpi_pm_prepare,
945 .finish = acpi_pm_finish,
946 .prepare = acpi_pm_prepare,
947 .enter = acpi_hibernation_enter,
948 .leave = acpi_hibernation_leave,
949 .pre_restore = acpi_pm_freeze,
950 .restore_cleanup = acpi_pm_thaw,
954 * acpi_hibernation_begin_old - Set the target system sleep state to
955 * ACPI_STATE_S4 and execute the _PTS control method. This
956 * function is used if the pre-ACPI 2.0 suspend ordering has been
959 static int acpi_hibernation_begin_old(void)
963 * The _TTS object should always be evaluated before the _PTS object.
964 * When the old_suspended_ordering is true, the _PTS object is
965 * evaluated in the acpi_sleep_prepare.
967 acpi_sleep_tts_switch(ACPI_STATE_S4);
969 error = acpi_sleep_prepare(ACPI_STATE_S4);
973 error = suspend_nvs_alloc();
975 acpi_target_sleep_state = ACPI_STATE_S4;
976 acpi_scan_lock_acquire();
983 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
986 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
987 .begin = acpi_hibernation_begin_old,
989 .pre_snapshot = acpi_pm_pre_suspend,
990 .prepare = acpi_pm_freeze,
991 .finish = acpi_pm_finish,
992 .enter = acpi_hibernation_enter,
993 .leave = acpi_hibernation_leave,
994 .pre_restore = acpi_pm_freeze,
995 .restore_cleanup = acpi_pm_thaw,
996 .recover = acpi_pm_finish,
999 static void acpi_sleep_hibernate_setup(void)
1001 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1004 hibernation_set_ops(old_suspend_ordering ?
1005 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1006 sleep_states[ACPI_STATE_S4] = 1;
1010 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1012 s4_hardware_signature = facs->hardware_signature;
1014 #else /* !CONFIG_HIBERNATION */
1015 static inline void acpi_sleep_hibernate_setup(void) {}
1016 #endif /* !CONFIG_HIBERNATION */
1018 static void acpi_power_off_prepare(void)
1020 /* Prepare to power off the system */
1021 acpi_sleep_prepare(ACPI_STATE_S5);
1022 acpi_disable_all_gpes();
1023 acpi_os_wait_events_complete();
1026 static void acpi_power_off(void)
1028 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1029 printk(KERN_DEBUG "%s called\n", __func__);
1030 local_irq_disable();
1031 acpi_enter_sleep_state(ACPI_STATE_S5);
1034 int __init acpi_sleep_init(void)
1036 char supported[ACPI_S_STATE_COUNT * 3 + 1];
1037 char *pos = supported;
1040 acpi_sleep_dmi_check();
1042 sleep_states[ACPI_STATE_S0] = 1;
1044 acpi_sleep_syscore_init();
1045 acpi_sleep_suspend_setup();
1046 acpi_sleep_hibernate_setup();
1048 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1049 sleep_states[ACPI_STATE_S5] = 1;
1050 pm_power_off_prepare = acpi_power_off_prepare;
1051 pm_power_off = acpi_power_off;
1057 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1058 if (sleep_states[i])
1059 pos += sprintf(pos, " S%d", i);
1061 pr_info(PREFIX "(supports%s)\n", supported);
1064 * Register the tts_notifier to reboot notifier list so that the _TTS
1065 * object can also be evaluated when the system enters S5.
1067 register_reboot_notifier(&tts_notifier);