1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * sleep.c - ACPI sleep support.
4 *
5 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
6 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
7 * Copyright (c) 2000-2003 Patrick Mochel
8 * Copyright (c) 2003 Open Source Development Lab
9 */
10
11 #include <linux/delay.h>
12 #include <linux/irq.h>
13 #include <linux/dmi.h>
14 #include <linux/device.h>
15 #include <linux/interrupt.h>
16 #include <linux/suspend.h>
17 #include <linux/reboot.h>
18 #include <linux/acpi.h>
19 #include <linux/module.h>
20 #include <linux/syscore_ops.h>
21 #include <asm/io.h>
22 #include <trace/events/power.h>
23
24 #include "internal.h"
25 #include "sleep.h"
26
27 /*
28 * Some HW-full platforms do not have _S5, so they may need
29 * to leverage efi power off for a shutdown.
30 */
31 bool acpi_no_s5;
32 static u8 sleep_states[ACPI_S_STATE_COUNT];
33
acpi_sleep_tts_switch(u32 acpi_state)34 static void acpi_sleep_tts_switch(u32 acpi_state)
35 {
36 acpi_status status;
37
38 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
39 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
40 /*
41 * OS can't evaluate the _TTS object correctly. Some warning
42 * message will be printed. But it won't break anything.
43 */
44 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
45 }
46 }
47
tts_notify_reboot(struct notifier_block * this,unsigned long code,void * x)48 static int tts_notify_reboot(struct notifier_block *this,
49 unsigned long code, void *x)
50 {
51 acpi_sleep_tts_switch(ACPI_STATE_S5);
52 return NOTIFY_DONE;
53 }
54
55 static struct notifier_block tts_notifier = {
56 .notifier_call = tts_notify_reboot,
57 .next = NULL,
58 .priority = 0,
59 };
60
acpi_sleep_prepare(u32 acpi_state)61 static int acpi_sleep_prepare(u32 acpi_state)
62 {
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)
67 return -EFAULT;
68 acpi_set_waking_vector(acpi_wakeup_address);
69
70 }
71 ACPI_FLUSH_CPU_CACHE();
72 #endif
73 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
74 acpi_state);
75 acpi_enable_wakeup_devices(acpi_state);
76 acpi_enter_sleep_state_prep(acpi_state);
77 return 0;
78 }
79
acpi_sleep_state_supported(u8 sleep_state)80 bool acpi_sleep_state_supported(u8 sleep_state)
81 {
82 acpi_status status;
83 u8 type_a, type_b;
84
85 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
86 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
87 || (acpi_gbl_FADT.sleep_control.address
88 && acpi_gbl_FADT.sleep_status.address));
89 }
90
91 #ifdef CONFIG_ACPI_SLEEP
92 static bool sleep_no_lps0 __read_mostly;
93 module_param(sleep_no_lps0, bool, 0644);
94 MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
95
96 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
97
acpi_target_system_state(void)98 u32 acpi_target_system_state(void)
99 {
100 return acpi_target_sleep_state;
101 }
102 EXPORT_SYMBOL_GPL(acpi_target_system_state);
103
104 static bool pwr_btn_event_pending;
105
106 /*
107 * The ACPI specification wants us to save NVS memory regions during hibernation
108 * and to restore them during the subsequent resume. Windows does that also for
109 * suspend to RAM. However, it is known that this mechanism does not work on
110 * all machines, so we allow the user to disable it with the help of the
111 * 'acpi_sleep=nonvs' kernel command line option.
112 */
113 static bool nvs_nosave;
114
acpi_nvs_nosave(void)115 void __init acpi_nvs_nosave(void)
116 {
117 nvs_nosave = true;
118 }
119
120 /*
121 * The ACPI specification wants us to save NVS memory regions during hibernation
122 * but says nothing about saving NVS during S3. Not all versions of Windows
123 * save NVS on S3 suspend either, and it is clear that not all systems need
124 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
125 * user to disable saving NVS on S3 if their system does not require it, but
126 * continue to save/restore NVS for S4 as specified.
127 */
128 static bool nvs_nosave_s3;
129
acpi_nvs_nosave_s3(void)130 void __init acpi_nvs_nosave_s3(void)
131 {
132 nvs_nosave_s3 = true;
133 }
134
init_nvs_save_s3(const struct dmi_system_id * d)135 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
136 {
137 nvs_nosave_s3 = false;
138 return 0;
139 }
140
141 /*
142 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
143 * user to request that behavior by using the 'acpi_old_suspend_ordering'
144 * kernel command line option that causes the following variable to be set.
145 */
146 static bool old_suspend_ordering;
147
acpi_old_suspend_ordering(void)148 void __init acpi_old_suspend_ordering(void)
149 {
150 old_suspend_ordering = true;
151 }
152
init_old_suspend_ordering(const struct dmi_system_id * d)153 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
154 {
155 acpi_old_suspend_ordering();
156 return 0;
157 }
158
init_nvs_nosave(const struct dmi_system_id * d)159 static int __init init_nvs_nosave(const struct dmi_system_id *d)
160 {
161 acpi_nvs_nosave();
162 return 0;
163 }
164
165 static bool acpi_sleep_default_s3;
166
init_default_s3(const struct dmi_system_id * d)167 static int __init init_default_s3(const struct dmi_system_id *d)
168 {
169 acpi_sleep_default_s3 = true;
170 return 0;
171 }
172
173 static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
174 {
175 .callback = init_old_suspend_ordering,
176 .ident = "Abit KN9 (nForce4 variant)",
177 .matches = {
178 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
179 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
180 },
181 },
182 {
183 .callback = init_old_suspend_ordering,
184 .ident = "HP xw4600 Workstation",
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
187 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
188 },
189 },
190 {
191 .callback = init_old_suspend_ordering,
192 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
193 .matches = {
194 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
195 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
196 },
197 },
198 {
199 .callback = init_old_suspend_ordering,
200 .ident = "Panasonic CF51-2L",
201 .matches = {
202 DMI_MATCH(DMI_BOARD_VENDOR,
203 "Matsushita Electric Industrial Co.,Ltd."),
204 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
205 },
206 },
207 {
208 .callback = init_nvs_nosave,
209 .ident = "Sony Vaio VGN-FW41E_H",
210 .matches = {
211 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
212 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
213 },
214 },
215 {
216 .callback = init_nvs_nosave,
217 .ident = "Sony Vaio VGN-FW21E",
218 .matches = {
219 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
220 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
221 },
222 },
223 {
224 .callback = init_nvs_nosave,
225 .ident = "Sony Vaio VGN-FW21M",
226 .matches = {
227 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
228 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
229 },
230 },
231 {
232 .callback = init_nvs_nosave,
233 .ident = "Sony Vaio VPCEB17FX",
234 .matches = {
235 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
236 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
237 },
238 },
239 {
240 .callback = init_nvs_nosave,
241 .ident = "Sony Vaio VGN-SR11M",
242 .matches = {
243 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
244 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
245 },
246 },
247 {
248 .callback = init_nvs_nosave,
249 .ident = "Everex StepNote Series",
250 .matches = {
251 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
252 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
253 },
254 },
255 {
256 .callback = init_nvs_nosave,
257 .ident = "Sony Vaio VPCEB1Z1E",
258 .matches = {
259 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
260 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
261 },
262 },
263 {
264 .callback = init_nvs_nosave,
265 .ident = "Sony Vaio VGN-NW130D",
266 .matches = {
267 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
268 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
269 },
270 },
271 {
272 .callback = init_nvs_nosave,
273 .ident = "Sony Vaio VPCCW29FX",
274 .matches = {
275 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
276 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
277 },
278 },
279 {
280 .callback = init_nvs_nosave,
281 .ident = "Averatec AV1020-ED2",
282 .matches = {
283 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
284 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
285 },
286 },
287 {
288 .callback = init_old_suspend_ordering,
289 .ident = "Asus A8N-SLI DELUXE",
290 .matches = {
291 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
292 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
293 },
294 },
295 {
296 .callback = init_old_suspend_ordering,
297 .ident = "Asus A8N-SLI Premium",
298 .matches = {
299 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
300 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
301 },
302 },
303 {
304 .callback = init_nvs_nosave,
305 .ident = "Sony Vaio VGN-SR26GN_P",
306 .matches = {
307 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
308 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
309 },
310 },
311 {
312 .callback = init_nvs_nosave,
313 .ident = "Sony Vaio VPCEB1S1E",
314 .matches = {
315 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
316 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
317 },
318 },
319 {
320 .callback = init_nvs_nosave,
321 .ident = "Sony Vaio VGN-FW520F",
322 .matches = {
323 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
324 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
325 },
326 },
327 {
328 .callback = init_nvs_nosave,
329 .ident = "Asus K54C",
330 .matches = {
331 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
332 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
333 },
334 },
335 {
336 .callback = init_nvs_nosave,
337 .ident = "Asus K54HR",
338 .matches = {
339 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
340 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
341 },
342 },
343 {
344 .callback = init_nvs_save_s3,
345 .ident = "Asus 1025C",
346 .matches = {
347 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
348 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
349 },
350 },
351 /*
352 * https://bugzilla.kernel.org/show_bug.cgi?id=189431
353 * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
354 * saving during S3.
355 */
356 {
357 .callback = init_nvs_save_s3,
358 .ident = "Lenovo G50-45",
359 .matches = {
360 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
361 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
362 },
363 },
364 {
365 .callback = init_nvs_save_s3,
366 .ident = "Lenovo G40-45",
367 .matches = {
368 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
369 DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
370 },
371 },
372 /*
373 * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
374 * the Low Power S0 Idle firmware interface (see
375 * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
376 */
377 {
378 .callback = init_default_s3,
379 .ident = "ThinkPad X1 Tablet(2016)",
380 .matches = {
381 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
382 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
383 },
384 },
385 {},
386 };
387
388 static bool ignore_blacklist;
389
acpi_sleep_no_blacklist(void)390 void __init acpi_sleep_no_blacklist(void)
391 {
392 ignore_blacklist = true;
393 }
394
acpi_sleep_dmi_check(void)395 static void __init acpi_sleep_dmi_check(void)
396 {
397 if (ignore_blacklist)
398 return;
399
400 if (dmi_get_bios_year() >= 2012)
401 acpi_nvs_nosave_s3();
402
403 dmi_check_system(acpisleep_dmi_table);
404 }
405
406 /**
407 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
408 */
acpi_pm_freeze(void)409 static int acpi_pm_freeze(void)
410 {
411 acpi_disable_all_gpes();
412 acpi_os_wait_events_complete();
413 acpi_ec_block_transactions();
414 return 0;
415 }
416
417 /**
418 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
419 */
acpi_pm_pre_suspend(void)420 static int acpi_pm_pre_suspend(void)
421 {
422 acpi_pm_freeze();
423 return suspend_nvs_save();
424 }
425
426 /**
427 * __acpi_pm_prepare - Prepare the platform to enter the target state.
428 *
429 * If necessary, set the firmware waking vector and do arch-specific
430 * nastiness to get the wakeup code to the waking vector.
431 */
__acpi_pm_prepare(void)432 static int __acpi_pm_prepare(void)
433 {
434 int error = acpi_sleep_prepare(acpi_target_sleep_state);
435 if (error)
436 acpi_target_sleep_state = ACPI_STATE_S0;
437
438 return error;
439 }
440
441 /**
442 * acpi_pm_prepare - Prepare the platform to enter the target sleep
443 * state and disable the GPEs.
444 */
acpi_pm_prepare(void)445 static int acpi_pm_prepare(void)
446 {
447 int error = __acpi_pm_prepare();
448 if (!error)
449 error = acpi_pm_pre_suspend();
450
451 return error;
452 }
453
454 /**
455 * acpi_pm_finish - Instruct the platform to leave a sleep state.
456 *
457 * This is called after we wake back up (or if entering the sleep state
458 * failed).
459 */
acpi_pm_finish(void)460 static void acpi_pm_finish(void)
461 {
462 struct acpi_device *pwr_btn_adev;
463 u32 acpi_state = acpi_target_sleep_state;
464
465 acpi_ec_unblock_transactions();
466 suspend_nvs_free();
467
468 if (acpi_state == ACPI_STATE_S0)
469 return;
470
471 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
472 acpi_state);
473 acpi_disable_wakeup_devices(acpi_state);
474 acpi_leave_sleep_state(acpi_state);
475
476 /* reset firmware waking vector */
477 acpi_set_waking_vector(0);
478
479 acpi_target_sleep_state = ACPI_STATE_S0;
480
481 acpi_resume_power_resources();
482
483 /* If we were woken with the fixed power button, provide a small
484 * hint to userspace in the form of a wakeup event on the fixed power
485 * button device (if it can be found).
486 *
487 * We delay the event generation til now, as the PM layer requires
488 * timekeeping to be running before we generate events. */
489 if (!pwr_btn_event_pending)
490 return;
491
492 pwr_btn_event_pending = false;
493 pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
494 NULL, -1);
495 if (pwr_btn_adev) {
496 pm_wakeup_event(&pwr_btn_adev->dev, 0);
497 acpi_dev_put(pwr_btn_adev);
498 }
499 }
500
501 /**
502 * acpi_pm_start - Start system PM transition.
503 */
acpi_pm_start(u32 acpi_state)504 static void acpi_pm_start(u32 acpi_state)
505 {
506 acpi_target_sleep_state = acpi_state;
507 acpi_sleep_tts_switch(acpi_target_sleep_state);
508 acpi_scan_lock_acquire();
509 }
510
511 /**
512 * acpi_pm_end - Finish up system PM transition.
513 */
acpi_pm_end(void)514 static void acpi_pm_end(void)
515 {
516 acpi_turn_off_unused_power_resources();
517 acpi_scan_lock_release();
518 /*
519 * This is necessary in case acpi_pm_finish() is not called during a
520 * failing transition to a sleep state.
521 */
522 acpi_target_sleep_state = ACPI_STATE_S0;
523 acpi_sleep_tts_switch(acpi_target_sleep_state);
524 }
525 #else /* !CONFIG_ACPI_SLEEP */
526 #define sleep_no_lps0 (1)
527 #define acpi_target_sleep_state ACPI_STATE_S0
528 #define acpi_sleep_default_s3 (1)
acpi_sleep_dmi_check(void)529 static inline void acpi_sleep_dmi_check(void) {}
530 #endif /* CONFIG_ACPI_SLEEP */
531
532 #ifdef CONFIG_SUSPEND
533 static u32 acpi_suspend_states[] = {
534 [PM_SUSPEND_ON] = ACPI_STATE_S0,
535 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
536 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
537 [PM_SUSPEND_MAX] = ACPI_STATE_S5
538 };
539
540 /**
541 * acpi_suspend_begin - Set the target system sleep state to the state
542 * associated with given @pm_state, if supported.
543 */
acpi_suspend_begin(suspend_state_t pm_state)544 static int acpi_suspend_begin(suspend_state_t pm_state)
545 {
546 u32 acpi_state = acpi_suspend_states[pm_state];
547 int error;
548
549 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
550 if (error)
551 return error;
552
553 if (!sleep_states[acpi_state]) {
554 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
555 return -ENOSYS;
556 }
557 if (acpi_state > ACPI_STATE_S1)
558 pm_set_suspend_via_firmware();
559
560 acpi_pm_start(acpi_state);
561 return 0;
562 }
563
564 /**
565 * acpi_suspend_enter - Actually enter a sleep state.
566 * @pm_state: ignored
567 *
568 * Flush caches and go to sleep. For STR we have to call arch-specific
569 * assembly, which in turn call acpi_enter_sleep_state().
570 * It's unfortunate, but it works. Please fix if you're feeling frisky.
571 */
acpi_suspend_enter(suspend_state_t pm_state)572 static int acpi_suspend_enter(suspend_state_t pm_state)
573 {
574 acpi_status status = AE_OK;
575 u32 acpi_state = acpi_target_sleep_state;
576 int error;
577
578 ACPI_FLUSH_CPU_CACHE();
579
580 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
581 switch (acpi_state) {
582 case ACPI_STATE_S1:
583 barrier();
584 status = acpi_enter_sleep_state(acpi_state);
585 break;
586
587 case ACPI_STATE_S3:
588 if (!acpi_suspend_lowlevel)
589 return -ENOSYS;
590 error = acpi_suspend_lowlevel();
591 if (error)
592 return error;
593 pr_info(PREFIX "Low-level resume complete\n");
594 pm_set_resume_via_firmware();
595 break;
596 }
597 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
598
599 /* This violates the spec but is required for bug compatibility. */
600 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
601
602 /* Reprogram control registers */
603 acpi_leave_sleep_state_prep(acpi_state);
604
605 /* ACPI 3.0 specs (P62) says that it's the responsibility
606 * of the OSPM to clear the status bit [ implying that the
607 * POWER_BUTTON event should not reach userspace ]
608 *
609 * However, we do generate a small hint for userspace in the form of
610 * a wakeup event. We flag this condition for now and generate the
611 * event later, as we're currently too early in resume to be able to
612 * generate wakeup events.
613 */
614 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
615 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
616
617 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
618
619 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
620 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
621 /* Flag for later */
622 pwr_btn_event_pending = true;
623 }
624 }
625
626 /*
627 * Disable and clear GPE status before interrupt is enabled. Some GPEs
628 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
629 * acpi_leave_sleep_state will reenable specific GPEs later
630 */
631 acpi_disable_all_gpes();
632 /* Allow EC transactions to happen. */
633 acpi_ec_unblock_transactions();
634
635 suspend_nvs_restore();
636
637 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
638 }
639
acpi_suspend_state_valid(suspend_state_t pm_state)640 static int acpi_suspend_state_valid(suspend_state_t pm_state)
641 {
642 u32 acpi_state;
643
644 switch (pm_state) {
645 case PM_SUSPEND_ON:
646 case PM_SUSPEND_STANDBY:
647 case PM_SUSPEND_MEM:
648 acpi_state = acpi_suspend_states[pm_state];
649
650 return sleep_states[acpi_state];
651 default:
652 return 0;
653 }
654 }
655
656 static const struct platform_suspend_ops acpi_suspend_ops = {
657 .valid = acpi_suspend_state_valid,
658 .begin = acpi_suspend_begin,
659 .prepare_late = acpi_pm_prepare,
660 .enter = acpi_suspend_enter,
661 .wake = acpi_pm_finish,
662 .end = acpi_pm_end,
663 };
664
665 /**
666 * acpi_suspend_begin_old - Set the target system sleep state to the
667 * state associated with given @pm_state, if supported, and
668 * execute the _PTS control method. This function is used if the
669 * pre-ACPI 2.0 suspend ordering has been requested.
670 */
acpi_suspend_begin_old(suspend_state_t pm_state)671 static int acpi_suspend_begin_old(suspend_state_t pm_state)
672 {
673 int error = acpi_suspend_begin(pm_state);
674 if (!error)
675 error = __acpi_pm_prepare();
676
677 return error;
678 }
679
680 /*
681 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
682 * been requested.
683 */
684 static const struct platform_suspend_ops acpi_suspend_ops_old = {
685 .valid = acpi_suspend_state_valid,
686 .begin = acpi_suspend_begin_old,
687 .prepare_late = acpi_pm_pre_suspend,
688 .enter = acpi_suspend_enter,
689 .wake = acpi_pm_finish,
690 .end = acpi_pm_end,
691 .recover = acpi_pm_finish,
692 };
693
694 static bool s2idle_wakeup;
695
696 /*
697 * On platforms supporting the Low Power S0 Idle interface there is an ACPI
698 * device object with the PNP0D80 compatible device ID (System Power Management
699 * Controller) and a specific _DSM method under it. That method, if present,
700 * can be used to indicate to the platform that the OS is transitioning into a
701 * low-power state in which certain types of activity are not desirable or that
702 * it is leaving such a state, which allows the platform to adjust its operation
703 * mode accordingly.
704 */
705 static const struct acpi_device_id lps0_device_ids[] = {
706 {"PNP0D80", },
707 {"", },
708 };
709
710 #define ACPI_LPS0_DSM_UUID "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
711
712 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS 1
713 #define ACPI_LPS0_SCREEN_OFF 3
714 #define ACPI_LPS0_SCREEN_ON 4
715 #define ACPI_LPS0_ENTRY 5
716 #define ACPI_LPS0_EXIT 6
717
718 static acpi_handle lps0_device_handle;
719 static guid_t lps0_dsm_guid;
720 static char lps0_dsm_func_mask;
721
722 /* Device constraint entry structure */
723 struct lpi_device_info {
724 char *name;
725 int enabled;
726 union acpi_object *package;
727 };
728
729 /* Constraint package structure */
730 struct lpi_device_constraint {
731 int uid;
732 int min_dstate;
733 int function_states;
734 };
735
736 struct lpi_constraints {
737 acpi_handle handle;
738 int min_dstate;
739 };
740
741 static struct lpi_constraints *lpi_constraints_table;
742 static int lpi_constraints_table_size;
743
lpi_device_get_constraints(void)744 static void lpi_device_get_constraints(void)
745 {
746 union acpi_object *out_obj;
747 int i;
748
749 out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
750 1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
751 NULL, ACPI_TYPE_PACKAGE);
752
753 acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
754 out_obj ? "successful" : "failed");
755
756 if (!out_obj)
757 return;
758
759 lpi_constraints_table = kcalloc(out_obj->package.count,
760 sizeof(*lpi_constraints_table),
761 GFP_KERNEL);
762 if (!lpi_constraints_table)
763 goto free_acpi_buffer;
764
765 acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
766
767 for (i = 0; i < out_obj->package.count; i++) {
768 struct lpi_constraints *constraint;
769 acpi_status status;
770 union acpi_object *package = &out_obj->package.elements[i];
771 struct lpi_device_info info = { };
772 int package_count = 0, j;
773
774 if (!package)
775 continue;
776
777 for (j = 0; j < package->package.count; ++j) {
778 union acpi_object *element =
779 &(package->package.elements[j]);
780
781 switch (element->type) {
782 case ACPI_TYPE_INTEGER:
783 info.enabled = element->integer.value;
784 break;
785 case ACPI_TYPE_STRING:
786 info.name = element->string.pointer;
787 break;
788 case ACPI_TYPE_PACKAGE:
789 package_count = element->package.count;
790 info.package = element->package.elements;
791 break;
792 }
793 }
794
795 if (!info.enabled || !info.package || !info.name)
796 continue;
797
798 constraint = &lpi_constraints_table[lpi_constraints_table_size];
799
800 status = acpi_get_handle(NULL, info.name, &constraint->handle);
801 if (ACPI_FAILURE(status))
802 continue;
803
804 acpi_handle_debug(lps0_device_handle,
805 "index:%d Name:%s\n", i, info.name);
806
807 constraint->min_dstate = -1;
808
809 for (j = 0; j < package_count; ++j) {
810 union acpi_object *info_obj = &info.package[j];
811 union acpi_object *cnstr_pkg;
812 union acpi_object *obj;
813 struct lpi_device_constraint dev_info;
814
815 switch (info_obj->type) {
816 case ACPI_TYPE_INTEGER:
817 /* version */
818 break;
819 case ACPI_TYPE_PACKAGE:
820 if (info_obj->package.count < 2)
821 break;
822
823 cnstr_pkg = info_obj->package.elements;
824 obj = &cnstr_pkg[0];
825 dev_info.uid = obj->integer.value;
826 obj = &cnstr_pkg[1];
827 dev_info.min_dstate = obj->integer.value;
828
829 acpi_handle_debug(lps0_device_handle,
830 "uid:%d min_dstate:%s\n",
831 dev_info.uid,
832 acpi_power_state_string(dev_info.min_dstate));
833
834 constraint->min_dstate = dev_info.min_dstate;
835 break;
836 }
837 }
838
839 if (constraint->min_dstate < 0) {
840 acpi_handle_debug(lps0_device_handle,
841 "Incomplete constraint defined\n");
842 continue;
843 }
844
845 lpi_constraints_table_size++;
846 }
847
848 acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
849
850 free_acpi_buffer:
851 ACPI_FREE(out_obj);
852 }
853
lpi_check_constraints(void)854 static void lpi_check_constraints(void)
855 {
856 int i;
857
858 for (i = 0; i < lpi_constraints_table_size; ++i) {
859 acpi_handle handle = lpi_constraints_table[i].handle;
860 struct acpi_device *adev;
861
862 if (!handle || acpi_bus_get_device(handle, &adev))
863 continue;
864
865 acpi_handle_debug(handle,
866 "LPI: required min power state:%s current power state:%s\n",
867 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
868 acpi_power_state_string(adev->power.state));
869
870 if (!adev->flags.power_manageable) {
871 acpi_handle_info(handle, "LPI: Device not power manageable\n");
872 lpi_constraints_table[i].handle = NULL;
873 continue;
874 }
875
876 if (adev->power.state < lpi_constraints_table[i].min_dstate)
877 acpi_handle_info(handle,
878 "LPI: Constraint not met; min power state:%s current power state:%s\n",
879 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
880 acpi_power_state_string(adev->power.state));
881 }
882 }
883
acpi_sleep_run_lps0_dsm(unsigned int func)884 static void acpi_sleep_run_lps0_dsm(unsigned int func)
885 {
886 union acpi_object *out_obj;
887
888 if (!(lps0_dsm_func_mask & (1 << func)))
889 return;
890
891 out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
892 ACPI_FREE(out_obj);
893
894 acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
895 func, out_obj ? "successful" : "failed");
896 }
897
lps0_device_attach(struct acpi_device * adev,const struct acpi_device_id * not_used)898 static int lps0_device_attach(struct acpi_device *adev,
899 const struct acpi_device_id *not_used)
900 {
901 union acpi_object *out_obj;
902
903 if (lps0_device_handle)
904 return 0;
905
906 if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
907 return 0;
908
909 guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
910 /* Check if the _DSM is present and as expected. */
911 out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
912 if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
913 acpi_handle_debug(adev->handle,
914 "_DSM function 0 evaluation failed\n");
915 return 0;
916 }
917
918 lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
919
920 ACPI_FREE(out_obj);
921
922 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
923 lps0_dsm_func_mask);
924
925 lps0_device_handle = adev->handle;
926
927 lpi_device_get_constraints();
928
929 /*
930 * Use suspend-to-idle by default if the default suspend mode was not
931 * set from the command line.
932 */
933 if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
934 mem_sleep_current = PM_SUSPEND_TO_IDLE;
935
936 /*
937 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
938 * EC GPE to be enabled while suspended for certain wakeup devices to
939 * work, so mark it as wakeup-capable.
940 */
941 acpi_ec_mark_gpe_for_wake();
942
943 return 0;
944 }
945
946 static struct acpi_scan_handler lps0_handler = {
947 .ids = lps0_device_ids,
948 .attach = lps0_device_attach,
949 };
950
acpi_s2idle_begin(void)951 static int acpi_s2idle_begin(void)
952 {
953 acpi_scan_lock_acquire();
954 return 0;
955 }
956
acpi_s2idle_prepare(void)957 static int acpi_s2idle_prepare(void)
958 {
959 if (acpi_sci_irq_valid()) {
960 enable_irq_wake(acpi_sci_irq);
961 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
962 }
963
964 acpi_enable_wakeup_devices(ACPI_STATE_S0);
965
966 /* Change the configuration of GPEs to avoid spurious wakeup. */
967 acpi_enable_all_wakeup_gpes();
968 acpi_os_wait_events_complete();
969
970 s2idle_wakeup = true;
971 return 0;
972 }
973
acpi_s2idle_prepare_late(void)974 static int acpi_s2idle_prepare_late(void)
975 {
976 if (!lps0_device_handle || sleep_no_lps0)
977 return 0;
978
979 if (pm_debug_messages_on)
980 lpi_check_constraints();
981
982 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
983 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
984
985 return 0;
986 }
987
acpi_s2idle_wake(void)988 static bool acpi_s2idle_wake(void)
989 {
990 if (!acpi_sci_irq_valid())
991 return pm_wakeup_pending();
992
993 while (pm_wakeup_pending()) {
994 /*
995 * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
996 * SCI has not triggered while suspended, so bail out (the
997 * wakeup is pending anyway and the SCI is not the source of
998 * it).
999 */
1000 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq)))
1001 return true;
1002
1003 /*
1004 * If the status bit of any enabled fixed event is set, the
1005 * wakeup is regarded as valid.
1006 */
1007 if (acpi_any_fixed_event_status_set())
1008 return true;
1009
1010 /* Check wakeups from drivers sharing the SCI. */
1011 if (acpi_check_wakeup_handlers())
1012 return true;
1013
1014 /* Check non-EC GPE wakeups and dispatch the EC GPE. */
1015 if (acpi_ec_dispatch_gpe())
1016 return true;
1017
1018 /*
1019 * Cancel the SCI wakeup and process all pending events in case
1020 * there are any wakeup ones in there.
1021 *
1022 * Note that if any non-EC GPEs are active at this point, the
1023 * SCI will retrigger after the rearming below, so no events
1024 * should be missed by canceling the wakeup here.
1025 */
1026 pm_system_cancel_wakeup();
1027 acpi_os_wait_events_complete();
1028
1029 /*
1030 * The SCI is in the "suspended" state now and it cannot produce
1031 * new wakeup events till the rearming below, so if any of them
1032 * are pending here, they must be resulting from the processing
1033 * of EC events above or coming from somewhere else.
1034 */
1035 if (pm_wakeup_pending())
1036 return true;
1037
1038 pm_wakeup_clear(acpi_sci_irq);
1039 rearm_wake_irq(acpi_sci_irq);
1040 }
1041
1042 return false;
1043 }
1044
acpi_s2idle_restore_early(void)1045 static void acpi_s2idle_restore_early(void)
1046 {
1047 if (!lps0_device_handle || sleep_no_lps0)
1048 return;
1049
1050 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1051 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1052 }
1053
acpi_s2idle_restore(void)1054 static void acpi_s2idle_restore(void)
1055 {
1056 /*
1057 * Drain pending events before restoring the working-state configuration
1058 * of GPEs.
1059 */
1060 acpi_os_wait_events_complete(); /* synchronize GPE processing */
1061 acpi_ec_flush_work(); /* flush the EC driver's workqueues */
1062 acpi_os_wait_events_complete(); /* synchronize Notify handling */
1063
1064 s2idle_wakeup = false;
1065
1066 acpi_enable_all_runtime_gpes();
1067
1068 acpi_disable_wakeup_devices(ACPI_STATE_S0);
1069
1070 if (acpi_sci_irq_valid()) {
1071 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1072 disable_irq_wake(acpi_sci_irq);
1073 }
1074 }
1075
acpi_s2idle_end(void)1076 static void acpi_s2idle_end(void)
1077 {
1078 acpi_scan_lock_release();
1079 }
1080
1081 static const struct platform_s2idle_ops acpi_s2idle_ops = {
1082 .begin = acpi_s2idle_begin,
1083 .prepare = acpi_s2idle_prepare,
1084 .prepare_late = acpi_s2idle_prepare_late,
1085 .wake = acpi_s2idle_wake,
1086 .restore_early = acpi_s2idle_restore_early,
1087 .restore = acpi_s2idle_restore,
1088 .end = acpi_s2idle_end,
1089 };
1090
acpi_sleep_suspend_setup(void)1091 static void acpi_sleep_suspend_setup(void)
1092 {
1093 int i;
1094
1095 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1096 if (acpi_sleep_state_supported(i))
1097 sleep_states[i] = 1;
1098
1099 suspend_set_ops(old_suspend_ordering ?
1100 &acpi_suspend_ops_old : &acpi_suspend_ops);
1101
1102 acpi_scan_add_handler(&lps0_handler);
1103 s2idle_set_ops(&acpi_s2idle_ops);
1104 }
1105
1106 #else /* !CONFIG_SUSPEND */
1107 #define s2idle_wakeup (false)
1108 #define lps0_device_handle (NULL)
acpi_sleep_suspend_setup(void)1109 static inline void acpi_sleep_suspend_setup(void) {}
1110 #endif /* !CONFIG_SUSPEND */
1111
acpi_s2idle_wakeup(void)1112 bool acpi_s2idle_wakeup(void)
1113 {
1114 return s2idle_wakeup;
1115 }
1116
1117 #ifdef CONFIG_PM_SLEEP
1118 static u32 saved_bm_rld;
1119
acpi_save_bm_rld(void)1120 static int acpi_save_bm_rld(void)
1121 {
1122 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1123 return 0;
1124 }
1125
acpi_restore_bm_rld(void)1126 static void acpi_restore_bm_rld(void)
1127 {
1128 u32 resumed_bm_rld = 0;
1129
1130 acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1131 if (resumed_bm_rld == saved_bm_rld)
1132 return;
1133
1134 acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1135 }
1136
1137 static struct syscore_ops acpi_sleep_syscore_ops = {
1138 .suspend = acpi_save_bm_rld,
1139 .resume = acpi_restore_bm_rld,
1140 };
1141
acpi_sleep_syscore_init(void)1142 static void acpi_sleep_syscore_init(void)
1143 {
1144 register_syscore_ops(&acpi_sleep_syscore_ops);
1145 }
1146 #else
acpi_sleep_syscore_init(void)1147 static inline void acpi_sleep_syscore_init(void) {}
1148 #endif /* CONFIG_PM_SLEEP */
1149
1150 #ifdef CONFIG_HIBERNATION
1151 static unsigned long s4_hardware_signature;
1152 static struct acpi_table_facs *facs;
1153 static bool nosigcheck;
1154
acpi_no_s4_hw_signature(void)1155 void __init acpi_no_s4_hw_signature(void)
1156 {
1157 nosigcheck = true;
1158 }
1159
acpi_hibernation_begin(pm_message_t stage)1160 static int acpi_hibernation_begin(pm_message_t stage)
1161 {
1162 if (!nvs_nosave) {
1163 int error = suspend_nvs_alloc();
1164 if (error)
1165 return error;
1166 }
1167
1168 if (stage.event == PM_EVENT_HIBERNATE)
1169 pm_set_suspend_via_firmware();
1170
1171 acpi_pm_start(ACPI_STATE_S4);
1172 return 0;
1173 }
1174
acpi_hibernation_enter(void)1175 static int acpi_hibernation_enter(void)
1176 {
1177 acpi_status status = AE_OK;
1178
1179 ACPI_FLUSH_CPU_CACHE();
1180
1181 /* This shouldn't return. If it returns, we have a problem */
1182 status = acpi_enter_sleep_state(ACPI_STATE_S4);
1183 /* Reprogram control registers */
1184 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1185
1186 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1187 }
1188
acpi_hibernation_leave(void)1189 static void acpi_hibernation_leave(void)
1190 {
1191 pm_set_resume_via_firmware();
1192 /*
1193 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1194 * enable it here.
1195 */
1196 acpi_enable();
1197 /* Reprogram control registers */
1198 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1199 /* Check the hardware signature */
1200 if (facs && s4_hardware_signature != facs->hardware_signature)
1201 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1202 /* Restore the NVS memory area */
1203 suspend_nvs_restore();
1204 /* Allow EC transactions to happen. */
1205 acpi_ec_unblock_transactions();
1206 }
1207
acpi_pm_thaw(void)1208 static void acpi_pm_thaw(void)
1209 {
1210 acpi_ec_unblock_transactions();
1211 acpi_enable_all_runtime_gpes();
1212 }
1213
1214 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1215 .begin = acpi_hibernation_begin,
1216 .end = acpi_pm_end,
1217 .pre_snapshot = acpi_pm_prepare,
1218 .finish = acpi_pm_finish,
1219 .prepare = acpi_pm_prepare,
1220 .enter = acpi_hibernation_enter,
1221 .leave = acpi_hibernation_leave,
1222 .pre_restore = acpi_pm_freeze,
1223 .restore_cleanup = acpi_pm_thaw,
1224 };
1225
1226 /**
1227 * acpi_hibernation_begin_old - Set the target system sleep state to
1228 * ACPI_STATE_S4 and execute the _PTS control method. This
1229 * function is used if the pre-ACPI 2.0 suspend ordering has been
1230 * requested.
1231 */
acpi_hibernation_begin_old(pm_message_t stage)1232 static int acpi_hibernation_begin_old(pm_message_t stage)
1233 {
1234 int error;
1235 /*
1236 * The _TTS object should always be evaluated before the _PTS object.
1237 * When the old_suspended_ordering is true, the _PTS object is
1238 * evaluated in the acpi_sleep_prepare.
1239 */
1240 acpi_sleep_tts_switch(ACPI_STATE_S4);
1241
1242 error = acpi_sleep_prepare(ACPI_STATE_S4);
1243 if (error)
1244 return error;
1245
1246 if (!nvs_nosave) {
1247 error = suspend_nvs_alloc();
1248 if (error)
1249 return error;
1250 }
1251
1252 if (stage.event == PM_EVENT_HIBERNATE)
1253 pm_set_suspend_via_firmware();
1254
1255 acpi_target_sleep_state = ACPI_STATE_S4;
1256 acpi_scan_lock_acquire();
1257 return 0;
1258 }
1259
1260 /*
1261 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1262 * been requested.
1263 */
1264 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1265 .begin = acpi_hibernation_begin_old,
1266 .end = acpi_pm_end,
1267 .pre_snapshot = acpi_pm_pre_suspend,
1268 .prepare = acpi_pm_freeze,
1269 .finish = acpi_pm_finish,
1270 .enter = acpi_hibernation_enter,
1271 .leave = acpi_hibernation_leave,
1272 .pre_restore = acpi_pm_freeze,
1273 .restore_cleanup = acpi_pm_thaw,
1274 .recover = acpi_pm_finish,
1275 };
1276
acpi_sleep_hibernate_setup(void)1277 static void acpi_sleep_hibernate_setup(void)
1278 {
1279 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1280 return;
1281
1282 hibernation_set_ops(old_suspend_ordering ?
1283 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1284 sleep_states[ACPI_STATE_S4] = 1;
1285 if (nosigcheck)
1286 return;
1287
1288 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1289 if (facs)
1290 s4_hardware_signature = facs->hardware_signature;
1291 }
1292 #else /* !CONFIG_HIBERNATION */
acpi_sleep_hibernate_setup(void)1293 static inline void acpi_sleep_hibernate_setup(void) {}
1294 #endif /* !CONFIG_HIBERNATION */
1295
acpi_power_off_prepare(void)1296 static void acpi_power_off_prepare(void)
1297 {
1298 /* Prepare to power off the system */
1299 acpi_sleep_prepare(ACPI_STATE_S5);
1300 acpi_disable_all_gpes();
1301 acpi_os_wait_events_complete();
1302 }
1303
acpi_power_off(void)1304 static void acpi_power_off(void)
1305 {
1306 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1307 printk(KERN_DEBUG "%s called\n", __func__);
1308 local_irq_disable();
1309 acpi_enter_sleep_state(ACPI_STATE_S5);
1310 }
1311
acpi_sleep_init(void)1312 int __init acpi_sleep_init(void)
1313 {
1314 char supported[ACPI_S_STATE_COUNT * 3 + 1];
1315 char *pos = supported;
1316 int i;
1317
1318 acpi_sleep_dmi_check();
1319
1320 sleep_states[ACPI_STATE_S0] = 1;
1321
1322 acpi_sleep_syscore_init();
1323 acpi_sleep_suspend_setup();
1324 acpi_sleep_hibernate_setup();
1325
1326 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1327 sleep_states[ACPI_STATE_S5] = 1;
1328 pm_power_off_prepare = acpi_power_off_prepare;
1329 pm_power_off = acpi_power_off;
1330 } else {
1331 acpi_no_s5 = true;
1332 }
1333
1334 supported[0] = 0;
1335 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1336 if (sleep_states[i])
1337 pos += sprintf(pos, " S%d", i);
1338 }
1339 pr_info(PREFIX "(supports%s)\n", supported);
1340
1341 /*
1342 * Register the tts_notifier to reboot notifier list so that the _TTS
1343 * object can also be evaluated when the system enters S5.
1344 */
1345 register_reboot_notifier(&tts_notifier);
1346 return 0;
1347 }
1348