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 const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
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_GET_DEVICE_CONSTRAINTS 1
673 #define ACPI_LPS0_SCREEN_OFF 3
674 #define ACPI_LPS0_SCREEN_ON 4
675 #define ACPI_LPS0_ENTRY 5
676 #define ACPI_LPS0_EXIT 6
678 #define ACPI_S2IDLE_FUNC_MASK ((1 << ACPI_LPS0_ENTRY) | (1 << ACPI_LPS0_EXIT))
680 static acpi_handle lps0_device_handle;
681 static guid_t lps0_dsm_guid;
682 static char lps0_dsm_func_mask;
684 /* Device constraint entry structure */
685 struct lpi_device_info {
688 union acpi_object *package;
691 /* Constraint package structure */
692 struct lpi_device_constraint {
698 struct lpi_constraints {
703 static struct lpi_constraints *lpi_constraints_table;
704 static int lpi_constraints_table_size;
706 static void lpi_device_get_constraints(void)
708 union acpi_object *out_obj;
711 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
712 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
713 NULL, ACPI_TYPE_PACKAGE);
715 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
716 out_obj ? "successful" : "failed");
721 lpi_constraints_table = kcalloc(out_obj->package.count,
722 sizeof(*lpi_constraints_table),
724 if (!lpi_constraints_table)
725 goto free_acpi_buffer;
727 acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
729 for (i = 0; i < out_obj->package.count; i++) {
730 struct lpi_constraints *constraint;
732 union acpi_object *package = &out_obj->package.elements[i];
733 struct lpi_device_info info = { };
734 int package_count = 0, j;
739 for (j = 0; j < package->package.count; ++j) {
740 union acpi_object *element =
741 &(package->package.elements[j]);
743 switch (element->type) {
744 case ACPI_TYPE_INTEGER:
745 info.enabled = element->integer.value;
747 case ACPI_TYPE_STRING:
748 info.name = element->string.pointer;
750 case ACPI_TYPE_PACKAGE:
751 package_count = element->package.count;
752 info.package = element->package.elements;
757 if (!info.enabled || !info.package || !info.name)
760 constraint = &lpi_constraints_table[lpi_constraints_table_size];
762 status = acpi_get_handle(NULL, info.name, &constraint->handle);
763 if (ACPI_FAILURE(status))
766 acpi_handle_debug(lps0_device_handle,
767 "index:%d Name:%s\n", i, info.name);
769 constraint->min_dstate = -1;
771 for (j = 0; j < package_count; ++j) {
772 union acpi_object *info_obj = &info.package[j];
773 union acpi_object *cnstr_pkg;
774 union acpi_object *obj;
775 struct lpi_device_constraint dev_info;
777 switch (info_obj->type) {
778 case ACPI_TYPE_INTEGER:
781 case ACPI_TYPE_PACKAGE:
782 if (info_obj->package.count < 2)
785 cnstr_pkg = info_obj->package.elements;
787 dev_info.uid = obj->integer.value;
789 dev_info.min_dstate = obj->integer.value;
791 acpi_handle_debug(lps0_device_handle,
792 "uid:%d min_dstate:%s\n",
794 acpi_power_state_string(dev_info.min_dstate));
796 constraint->min_dstate = dev_info.min_dstate;
801 if (constraint->min_dstate < 0) {
802 acpi_handle_debug(lps0_device_handle,
803 "Incomplete constraint defined\n");
807 lpi_constraints_table_size++;
810 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
816 static void lpi_check_constraints(void)
820 for (i = 0; i < lpi_constraints_table_size; ++i) {
821 struct acpi_device *adev;
823 if (acpi_bus_get_device(lpi_constraints_table[i].handle, &adev))
826 acpi_handle_debug(adev->handle,
827 "LPI: required min power state:%s current power state:%s\n",
828 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
829 acpi_power_state_string(adev->power.state));
831 if (!adev->flags.power_manageable) {
832 acpi_handle_info(adev->handle, "LPI: Device not power manageble\n");
836 if (adev->power.state < lpi_constraints_table[i].min_dstate)
837 acpi_handle_info(adev->handle,
838 "LPI: Constraint not met; min power state:%s current power state:%s\n",
839 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
840 acpi_power_state_string(adev->power.state));
844 static void acpi_sleep_run_lps0_dsm(unsigned int func)
846 union acpi_object *out_obj;
848 if (!(lps0_dsm_func_mask & (1 << func)))
851 out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
854 acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
855 func, out_obj ? "successful" : "failed");
858 static int lps0_device_attach(struct acpi_device *adev,
859 const struct acpi_device_id *not_used)
861 union acpi_object *out_obj;
863 if (lps0_device_handle)
866 if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
869 guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
870 /* Check if the _DSM is present and as expected. */
871 out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
872 if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
873 char bitmask = *(char *)out_obj->buffer.pointer;
875 if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) {
876 lps0_dsm_func_mask = bitmask;
877 lps0_device_handle = adev->handle;
879 * Use suspend-to-idle by default if the default
880 * suspend mode was not set from the command line.
882 if (mem_sleep_default > PM_SUSPEND_MEM)
883 mem_sleep_current = PM_SUSPEND_TO_IDLE;
886 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
889 acpi_handle_debug(adev->handle,
890 "_DSM function 0 evaluation failed\n");
894 lpi_device_get_constraints();
899 static struct acpi_scan_handler lps0_handler = {
900 .ids = lps0_device_ids,
901 .attach = lps0_device_attach,
904 static int acpi_s2idle_begin(void)
906 acpi_scan_lock_acquire();
907 s2idle_in_progress = true;
911 static int acpi_s2idle_prepare(void)
913 if (lps0_device_handle) {
914 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
915 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
918 * The configuration of GPEs is changed here to avoid spurious
919 * wakeups, but that should not be necessary if this is a
920 * "low-power S0" platform and the low-power S0 _DSM is present.
922 acpi_enable_all_wakeup_gpes();
923 acpi_os_wait_events_complete();
925 if (acpi_sci_irq_valid())
926 enable_irq_wake(acpi_sci_irq);
931 static void acpi_s2idle_wake(void)
934 if (pm_debug_messages_on)
935 lpi_check_constraints();
938 * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
939 * that the SCI has triggered while suspended, so cancel the wakeup in
940 * case it has not been a wakeup event (the GPEs will be checked later).
942 if (acpi_sci_irq_valid() &&
943 !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
944 pm_system_cancel_wakeup();
945 s2idle_wakeup = true;
949 static void acpi_s2idle_sync(void)
952 * Process all pending events in case there are any wakeup ones.
954 * The EC driver uses the system workqueue and an additional special
955 * one, so those need to be flushed too.
957 acpi_ec_flush_work();
958 acpi_os_wait_events_complete();
959 s2idle_wakeup = false;
962 static void acpi_s2idle_restore(void)
964 if (acpi_sci_irq_valid())
965 disable_irq_wake(acpi_sci_irq);
967 if (lps0_device_handle) {
968 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
969 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
971 acpi_enable_all_runtime_gpes();
975 static void acpi_s2idle_end(void)
977 s2idle_in_progress = false;
978 acpi_scan_lock_release();
981 static const struct platform_s2idle_ops acpi_s2idle_ops = {
982 .begin = acpi_s2idle_begin,
983 .prepare = acpi_s2idle_prepare,
984 .wake = acpi_s2idle_wake,
985 .sync = acpi_s2idle_sync,
986 .restore = acpi_s2idle_restore,
987 .end = acpi_s2idle_end,
990 static void acpi_sleep_suspend_setup(void)
994 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
995 if (acpi_sleep_state_supported(i))
998 suspend_set_ops(old_suspend_ordering ?
999 &acpi_suspend_ops_old : &acpi_suspend_ops);
1001 acpi_scan_add_handler(&lps0_handler);
1002 s2idle_set_ops(&acpi_s2idle_ops);
1005 #else /* !CONFIG_SUSPEND */
1006 #define s2idle_in_progress (false)
1007 #define s2idle_wakeup (false)
1008 #define lps0_device_handle (NULL)
1009 static inline void acpi_sleep_suspend_setup(void) {}
1010 #endif /* !CONFIG_SUSPEND */
1012 bool acpi_s2idle_wakeup(void)
1014 return s2idle_wakeup;
1017 bool acpi_sleep_no_ec_events(void)
1019 return !s2idle_in_progress || !lps0_device_handle;
1022 #ifdef CONFIG_PM_SLEEP
1023 static u32 saved_bm_rld;
1025 static int acpi_save_bm_rld(void)
1027 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1031 static void acpi_restore_bm_rld(void)
1033 u32 resumed_bm_rld = 0;
1035 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1036 if (resumed_bm_rld == saved_bm_rld)
1039 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1042 static struct syscore_ops acpi_sleep_syscore_ops = {
1043 .suspend = acpi_save_bm_rld,
1044 .resume = acpi_restore_bm_rld,
1047 static void acpi_sleep_syscore_init(void)
1049 register_syscore_ops(&acpi_sleep_syscore_ops);
1052 static inline void acpi_sleep_syscore_init(void) {}
1053 #endif /* CONFIG_PM_SLEEP */
1055 #ifdef CONFIG_HIBERNATION
1056 static unsigned long s4_hardware_signature;
1057 static struct acpi_table_facs *facs;
1058 static bool nosigcheck;
1060 void __init acpi_no_s4_hw_signature(void)
1065 static int acpi_hibernation_begin(void)
1069 error = nvs_nosave ? 0 : suspend_nvs_alloc();
1071 acpi_pm_start(ACPI_STATE_S4);
1076 static int acpi_hibernation_enter(void)
1078 acpi_status status = AE_OK;
1080 ACPI_FLUSH_CPU_CACHE();
1082 /* This shouldn't return. If it returns, we have a problem */
1083 status = acpi_enter_sleep_state(ACPI_STATE_S4);
1084 /* Reprogram control registers */
1085 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1087 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1090 static void acpi_hibernation_leave(void)
1092 pm_set_resume_via_firmware();
1094 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1098 /* Reprogram control registers */
1099 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1100 /* Check the hardware signature */
1101 if (facs && s4_hardware_signature != facs->hardware_signature)
1102 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1103 /* Restore the NVS memory area */
1104 suspend_nvs_restore();
1105 /* Allow EC transactions to happen. */
1106 acpi_ec_unblock_transactions();
1109 static void acpi_pm_thaw(void)
1111 acpi_ec_unblock_transactions();
1112 acpi_enable_all_runtime_gpes();
1115 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1116 .begin = acpi_hibernation_begin,
1118 .pre_snapshot = acpi_pm_prepare,
1119 .finish = acpi_pm_finish,
1120 .prepare = acpi_pm_prepare,
1121 .enter = acpi_hibernation_enter,
1122 .leave = acpi_hibernation_leave,
1123 .pre_restore = acpi_pm_freeze,
1124 .restore_cleanup = acpi_pm_thaw,
1128 * acpi_hibernation_begin_old - Set the target system sleep state to
1129 * ACPI_STATE_S4 and execute the _PTS control method. This
1130 * function is used if the pre-ACPI 2.0 suspend ordering has been
1133 static int acpi_hibernation_begin_old(void)
1137 * The _TTS object should always be evaluated before the _PTS object.
1138 * When the old_suspended_ordering is true, the _PTS object is
1139 * evaluated in the acpi_sleep_prepare.
1141 acpi_sleep_tts_switch(ACPI_STATE_S4);
1143 error = acpi_sleep_prepare(ACPI_STATE_S4);
1147 error = suspend_nvs_alloc();
1149 acpi_target_sleep_state = ACPI_STATE_S4;
1150 acpi_scan_lock_acquire();
1157 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1160 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1161 .begin = acpi_hibernation_begin_old,
1163 .pre_snapshot = acpi_pm_pre_suspend,
1164 .prepare = acpi_pm_freeze,
1165 .finish = acpi_pm_finish,
1166 .enter = acpi_hibernation_enter,
1167 .leave = acpi_hibernation_leave,
1168 .pre_restore = acpi_pm_freeze,
1169 .restore_cleanup = acpi_pm_thaw,
1170 .recover = acpi_pm_finish,
1173 static void acpi_sleep_hibernate_setup(void)
1175 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1178 hibernation_set_ops(old_suspend_ordering ?
1179 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1180 sleep_states[ACPI_STATE_S4] = 1;
1184 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1186 s4_hardware_signature = facs->hardware_signature;
1188 #else /* !CONFIG_HIBERNATION */
1189 static inline void acpi_sleep_hibernate_setup(void) {}
1190 #endif /* !CONFIG_HIBERNATION */
1192 static void acpi_power_off_prepare(void)
1194 /* Prepare to power off the system */
1195 acpi_sleep_prepare(ACPI_STATE_S5);
1196 acpi_disable_all_gpes();
1197 acpi_os_wait_events_complete();
1200 static void acpi_power_off(void)
1202 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1203 printk(KERN_DEBUG "%s called\n", __func__);
1204 local_irq_disable();
1205 acpi_enter_sleep_state(ACPI_STATE_S5);
1208 int __init acpi_sleep_init(void)
1210 char supported[ACPI_S_STATE_COUNT * 3 + 1];
1211 char *pos = supported;
1214 acpi_sleep_dmi_check();
1216 sleep_states[ACPI_STATE_S0] = 1;
1218 acpi_sleep_syscore_init();
1219 acpi_sleep_suspend_setup();
1220 acpi_sleep_hibernate_setup();
1222 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1223 sleep_states[ACPI_STATE_S5] = 1;
1224 pm_power_off_prepare = acpi_power_off_prepare;
1225 pm_power_off = acpi_power_off;
1231 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1232 if (sleep_states[i])
1233 pos += sprintf(pos, " S%d", i);
1235 pr_info(PREFIX "(supports%s)\n", supported);
1238 * Register the tts_notifier to reboot notifier list so that the _TTS
1239 * object can also be evaluated when the system enters S5.
1241 register_reboot_notifier(&tts_notifier);