Merge branch 'acpi-assorted'
[linux-3.10.git] / drivers / acpi / sleep.c
1 /*
2  * sleep.c - ACPI sleep support.
3  *
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
8  *
9  * This file is released under the GPLv2.
10  *
11  */
12
13 #include <linux/delay.h>
14 #include <linux/irq.h>
15 #include <linux/dmi.h>
16 #include <linux/device.h>
17 #include <linux/suspend.h>
18 #include <linux/reboot.h>
19 #include <linux/acpi.h>
20 #include <linux/module.h>
21
22 #include <asm/io.h>
23
24 #include <acpi/acpi_bus.h>
25 #include <acpi/acpi_drivers.h>
26
27 #include "internal.h"
28 #include "sleep.h"
29
30 static u8 sleep_states[ACPI_S_STATE_COUNT];
31
32 static void acpi_sleep_tts_switch(u32 acpi_state)
33 {
34         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
35         struct acpi_object_list arg_list = { 1, &in_arg };
36         acpi_status status = AE_OK;
37
38         in_arg.integer.value = acpi_state;
39         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
40         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
41                 /*
42                  * OS can't evaluate the _TTS object correctly. Some warning
43                  * message will be printed. But it won't break anything.
44                  */
45                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
46         }
47 }
48
49 static int tts_notify_reboot(struct notifier_block *this,
50                         unsigned long code, void *x)
51 {
52         acpi_sleep_tts_switch(ACPI_STATE_S5);
53         return NOTIFY_DONE;
54 }
55
56 static struct notifier_block tts_notifier = {
57         .notifier_call  = tts_notify_reboot,
58         .next           = NULL,
59         .priority       = 0,
60 };
61
62 static int acpi_sleep_prepare(u32 acpi_state)
63 {
64 #ifdef CONFIG_ACPI_SLEEP
65         /* do we have a wakeup address for S2 and S3? */
66         if (acpi_state == ACPI_STATE_S3) {
67                 if (!acpi_wakeup_address)
68                         return -EFAULT;
69                 acpi_set_firmware_waking_vector(acpi_wakeup_address);
70
71         }
72         ACPI_FLUSH_CPU_CACHE();
73 #endif
74         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
75                 acpi_state);
76         acpi_enable_wakeup_devices(acpi_state);
77         acpi_enter_sleep_state_prep(acpi_state);
78         return 0;
79 }
80
81 #ifdef CONFIG_ACPI_SLEEP
82 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
83
84 u32 acpi_target_system_state(void)
85 {
86         return acpi_target_sleep_state;
87 }
88
89 static bool pwr_btn_event_pending;
90
91 /*
92  * The ACPI specification wants us to save NVS memory regions during hibernation
93  * and to restore them during the subsequent resume.  Windows does that also for
94  * suspend to RAM.  However, it is known that this mechanism does not work on
95  * all machines, so we allow the user to disable it with the help of the
96  * 'acpi_sleep=nonvs' kernel command line option.
97  */
98 static bool nvs_nosave;
99
100 void __init acpi_nvs_nosave(void)
101 {
102         nvs_nosave = true;
103 }
104
105 /*
106  * The ACPI specification wants us to save NVS memory regions during hibernation
107  * but says nothing about saving NVS during S3.  Not all versions of Windows
108  * save NVS on S3 suspend either, and it is clear that not all systems need
109  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
110  * user to disable saving NVS on S3 if their system does not require it, but
111  * continue to save/restore NVS for S4 as specified.
112  */
113 static bool nvs_nosave_s3;
114
115 void __init acpi_nvs_nosave_s3(void)
116 {
117         nvs_nosave_s3 = true;
118 }
119
120 /*
121  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
122  * user to request that behavior by using the 'acpi_old_suspend_ordering'
123  * kernel command line option that causes the following variable to be set.
124  */
125 static bool old_suspend_ordering;
126
127 void __init acpi_old_suspend_ordering(void)
128 {
129         old_suspend_ordering = true;
130 }
131
132 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
133 {
134         acpi_old_suspend_ordering();
135         return 0;
136 }
137
138 static int __init init_nvs_nosave(const struct dmi_system_id *d)
139 {
140         acpi_nvs_nosave();
141         return 0;
142 }
143
144 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
145         {
146         .callback = init_old_suspend_ordering,
147         .ident = "Abit KN9 (nForce4 variant)",
148         .matches = {
149                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
150                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
151                 },
152         },
153         {
154         .callback = init_old_suspend_ordering,
155         .ident = "HP xw4600 Workstation",
156         .matches = {
157                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
158                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
159                 },
160         },
161         {
162         .callback = init_old_suspend_ordering,
163         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
164         .matches = {
165                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
166                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
167                 },
168         },
169         {
170         .callback = init_old_suspend_ordering,
171         .ident = "Panasonic CF51-2L",
172         .matches = {
173                 DMI_MATCH(DMI_BOARD_VENDOR,
174                                 "Matsushita Electric Industrial Co.,Ltd."),
175                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
176                 },
177         },
178         {
179         .callback = init_nvs_nosave,
180         .ident = "Sony Vaio VGN-FW41E_H",
181         .matches = {
182                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
183                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
184                 },
185         },
186         {
187         .callback = init_nvs_nosave,
188         .ident = "Sony Vaio VGN-FW21E",
189         .matches = {
190                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
191                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
192                 },
193         },
194         {
195         .callback = init_nvs_nosave,
196         .ident = "Sony Vaio VPCEB17FX",
197         .matches = {
198                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
199                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
200                 },
201         },
202         {
203         .callback = init_nvs_nosave,
204         .ident = "Sony Vaio VGN-SR11M",
205         .matches = {
206                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
207                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
208                 },
209         },
210         {
211         .callback = init_nvs_nosave,
212         .ident = "Everex StepNote Series",
213         .matches = {
214                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
215                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
216                 },
217         },
218         {
219         .callback = init_nvs_nosave,
220         .ident = "Sony Vaio VPCEB1Z1E",
221         .matches = {
222                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
223                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
224                 },
225         },
226         {
227         .callback = init_nvs_nosave,
228         .ident = "Sony Vaio VGN-NW130D",
229         .matches = {
230                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
231                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
232                 },
233         },
234         {
235         .callback = init_nvs_nosave,
236         .ident = "Sony Vaio VPCCW29FX",
237         .matches = {
238                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
239                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
240                 },
241         },
242         {
243         .callback = init_nvs_nosave,
244         .ident = "Averatec AV1020-ED2",
245         .matches = {
246                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
247                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
248                 },
249         },
250         {
251         .callback = init_old_suspend_ordering,
252         .ident = "Asus A8N-SLI DELUXE",
253         .matches = {
254                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
255                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
256                 },
257         },
258         {
259         .callback = init_old_suspend_ordering,
260         .ident = "Asus A8N-SLI Premium",
261         .matches = {
262                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
263                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
264                 },
265         },
266         {
267         .callback = init_nvs_nosave,
268         .ident = "Sony Vaio VGN-SR26GN_P",
269         .matches = {
270                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
271                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
272                 },
273         },
274         {
275         .callback = init_nvs_nosave,
276         .ident = "Sony Vaio VPCEB1S1E",
277         .matches = {
278                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
279                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
280                 },
281         },
282         {
283         .callback = init_nvs_nosave,
284         .ident = "Sony Vaio VGN-FW520F",
285         .matches = {
286                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
287                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
288                 },
289         },
290         {
291         .callback = init_nvs_nosave,
292         .ident = "Asus K54C",
293         .matches = {
294                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
295                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
296                 },
297         },
298         {
299         .callback = init_nvs_nosave,
300         .ident = "Asus K54HR",
301         .matches = {
302                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
303                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
304                 },
305         },
306         {},
307 };
308
309 static void acpi_sleep_dmi_check(void)
310 {
311         dmi_check_system(acpisleep_dmi_table);
312 }
313
314 /**
315  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
316  */
317 static int acpi_pm_freeze(void)
318 {
319         acpi_disable_all_gpes();
320         acpi_os_wait_events_complete();
321         acpi_ec_block_transactions();
322         return 0;
323 }
324
325 /**
326  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
327  */
328 static int acpi_pm_pre_suspend(void)
329 {
330         acpi_pm_freeze();
331         return suspend_nvs_save();
332 }
333
334 /**
335  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
336  *
337  *      If necessary, set the firmware waking vector and do arch-specific
338  *      nastiness to get the wakeup code to the waking vector.
339  */
340 static int __acpi_pm_prepare(void)
341 {
342         int error = acpi_sleep_prepare(acpi_target_sleep_state);
343         if (error)
344                 acpi_target_sleep_state = ACPI_STATE_S0;
345
346         return error;
347 }
348
349 /**
350  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
351  *              state and disable the GPEs.
352  */
353 static int acpi_pm_prepare(void)
354 {
355         int error = __acpi_pm_prepare();
356         if (!error)
357                 error = acpi_pm_pre_suspend();
358
359         return error;
360 }
361
362 static int find_powerf_dev(struct device *dev, void *data)
363 {
364         struct acpi_device *device = to_acpi_device(dev);
365         const char *hid = acpi_device_hid(device);
366
367         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
368 }
369
370 /**
371  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
372  *
373  *      This is called after we wake back up (or if entering the sleep state
374  *      failed).
375  */
376 static void acpi_pm_finish(void)
377 {
378         struct device *pwr_btn_dev;
379         u32 acpi_state = acpi_target_sleep_state;
380
381         acpi_ec_unblock_transactions();
382         suspend_nvs_free();
383
384         if (acpi_state == ACPI_STATE_S0)
385                 return;
386
387         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
388                 acpi_state);
389         acpi_disable_wakeup_devices(acpi_state);
390         acpi_leave_sleep_state(acpi_state);
391
392         /* reset firmware waking vector */
393         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
394
395         acpi_target_sleep_state = ACPI_STATE_S0;
396
397         acpi_resume_power_resources();
398
399         /* If we were woken with the fixed power button, provide a small
400          * hint to userspace in the form of a wakeup event on the fixed power
401          * button device (if it can be found).
402          *
403          * We delay the event generation til now, as the PM layer requires
404          * timekeeping to be running before we generate events. */
405         if (!pwr_btn_event_pending)
406                 return;
407
408         pwr_btn_event_pending = false;
409         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
410                                       find_powerf_dev);
411         if (pwr_btn_dev) {
412                 pm_wakeup_event(pwr_btn_dev, 0);
413                 put_device(pwr_btn_dev);
414         }
415 }
416
417 /**
418  *      acpi_pm_end - Finish up suspend sequence.
419  */
420 static void acpi_pm_end(void)
421 {
422         /*
423          * This is necessary in case acpi_pm_finish() is not called during a
424          * failing transition to a sleep state.
425          */
426         acpi_target_sleep_state = ACPI_STATE_S0;
427         acpi_sleep_tts_switch(acpi_target_sleep_state);
428 }
429 #else /* !CONFIG_ACPI_SLEEP */
430 #define acpi_target_sleep_state ACPI_STATE_S0
431 static inline void acpi_sleep_dmi_check(void) {}
432 #endif /* CONFIG_ACPI_SLEEP */
433
434 #ifdef CONFIG_SUSPEND
435 static u32 acpi_suspend_states[] = {
436         [PM_SUSPEND_ON] = ACPI_STATE_S0,
437         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
438         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
439         [PM_SUSPEND_MAX] = ACPI_STATE_S5
440 };
441
442 /**
443  *      acpi_suspend_begin - Set the target system sleep state to the state
444  *              associated with given @pm_state, if supported.
445  */
446 static int acpi_suspend_begin(suspend_state_t pm_state)
447 {
448         u32 acpi_state = acpi_suspend_states[pm_state];
449         int error = 0;
450
451         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
452         if (error)
453                 return error;
454
455         if (sleep_states[acpi_state]) {
456                 acpi_target_sleep_state = acpi_state;
457                 acpi_sleep_tts_switch(acpi_target_sleep_state);
458         } else {
459                 printk(KERN_ERR "ACPI does not support this state: %d\n",
460                         pm_state);
461                 error = -ENOSYS;
462         }
463         return error;
464 }
465
466 /**
467  *      acpi_suspend_enter - Actually enter a sleep state.
468  *      @pm_state: ignored
469  *
470  *      Flush caches and go to sleep. For STR we have to call arch-specific
471  *      assembly, which in turn call acpi_enter_sleep_state().
472  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
473  */
474 static int acpi_suspend_enter(suspend_state_t pm_state)
475 {
476         acpi_status status = AE_OK;
477         u32 acpi_state = acpi_target_sleep_state;
478         int error;
479
480         ACPI_FLUSH_CPU_CACHE();
481
482         switch (acpi_state) {
483         case ACPI_STATE_S1:
484                 barrier();
485                 status = acpi_enter_sleep_state(acpi_state);
486                 break;
487
488         case ACPI_STATE_S3:
489                 error = acpi_suspend_lowlevel();
490                 if (error)
491                         return error;
492                 pr_info(PREFIX "Low-level resume complete\n");
493                 break;
494         }
495
496         /* This violates the spec but is required for bug compatibility. */
497         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
498
499         /* Reprogram control registers */
500         acpi_leave_sleep_state_prep(acpi_state);
501
502         /* ACPI 3.0 specs (P62) says that it's the responsibility
503          * of the OSPM to clear the status bit [ implying that the
504          * POWER_BUTTON event should not reach userspace ]
505          *
506          * However, we do generate a small hint for userspace in the form of
507          * a wakeup event. We flag this condition for now and generate the
508          * event later, as we're currently too early in resume to be able to
509          * generate wakeup events.
510          */
511         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
512                 acpi_event_status pwr_btn_status;
513
514                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
515
516                 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
517                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
518                         /* Flag for later */
519                         pwr_btn_event_pending = true;
520                 }
521         }
522
523         /*
524          * Disable and clear GPE status before interrupt is enabled. Some GPEs
525          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
526          * acpi_leave_sleep_state will reenable specific GPEs later
527          */
528         acpi_disable_all_gpes();
529         /* Allow EC transactions to happen. */
530         acpi_ec_unblock_transactions_early();
531
532         suspend_nvs_restore();
533
534         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
535 }
536
537 static int acpi_suspend_state_valid(suspend_state_t pm_state)
538 {
539         u32 acpi_state;
540
541         switch (pm_state) {
542         case PM_SUSPEND_ON:
543         case PM_SUSPEND_STANDBY:
544         case PM_SUSPEND_MEM:
545                 acpi_state = acpi_suspend_states[pm_state];
546
547                 return sleep_states[acpi_state];
548         default:
549                 return 0;
550         }
551 }
552
553 static const struct platform_suspend_ops acpi_suspend_ops = {
554         .valid = acpi_suspend_state_valid,
555         .begin = acpi_suspend_begin,
556         .prepare_late = acpi_pm_prepare,
557         .enter = acpi_suspend_enter,
558         .wake = acpi_pm_finish,
559         .end = acpi_pm_end,
560 };
561
562 /**
563  *      acpi_suspend_begin_old - Set the target system sleep state to the
564  *              state associated with given @pm_state, if supported, and
565  *              execute the _PTS control method.  This function is used if the
566  *              pre-ACPI 2.0 suspend ordering has been requested.
567  */
568 static int acpi_suspend_begin_old(suspend_state_t pm_state)
569 {
570         int error = acpi_suspend_begin(pm_state);
571         if (!error)
572                 error = __acpi_pm_prepare();
573
574         return error;
575 }
576
577 /*
578  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
579  * been requested.
580  */
581 static const struct platform_suspend_ops acpi_suspend_ops_old = {
582         .valid = acpi_suspend_state_valid,
583         .begin = acpi_suspend_begin_old,
584         .prepare_late = acpi_pm_pre_suspend,
585         .enter = acpi_suspend_enter,
586         .wake = acpi_pm_finish,
587         .end = acpi_pm_end,
588         .recover = acpi_pm_finish,
589 };
590
591 static void acpi_sleep_suspend_setup(void)
592 {
593         int i;
594
595         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
596                 acpi_status status;
597                 u8 type_a, type_b;
598
599                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
600                 if (ACPI_SUCCESS(status)) {
601                         sleep_states[i] = 1;
602                         pr_cont(" S%d", i);
603                 }
604         }
605
606         suspend_set_ops(old_suspend_ordering ?
607                 &acpi_suspend_ops_old : &acpi_suspend_ops);
608 }
609 #else /* !CONFIG_SUSPEND */
610 static inline void acpi_sleep_suspend_setup(void) {}
611 #endif /* !CONFIG_SUSPEND */
612
613 #ifdef CONFIG_HIBERNATION
614 static unsigned long s4_hardware_signature;
615 static struct acpi_table_facs *facs;
616 static bool nosigcheck;
617
618 void __init acpi_no_s4_hw_signature(void)
619 {
620         nosigcheck = true;
621 }
622
623 static int acpi_hibernation_begin(void)
624 {
625         int error;
626
627         error = nvs_nosave ? 0 : suspend_nvs_alloc();
628         if (!error) {
629                 acpi_target_sleep_state = ACPI_STATE_S4;
630                 acpi_sleep_tts_switch(acpi_target_sleep_state);
631         }
632
633         return error;
634 }
635
636 static int acpi_hibernation_enter(void)
637 {
638         acpi_status status = AE_OK;
639
640         ACPI_FLUSH_CPU_CACHE();
641
642         /* This shouldn't return.  If it returns, we have a problem */
643         status = acpi_enter_sleep_state(ACPI_STATE_S4);
644         /* Reprogram control registers */
645         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
646
647         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
648 }
649
650 static void acpi_hibernation_leave(void)
651 {
652         /*
653          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
654          * enable it here.
655          */
656         acpi_enable();
657         /* Reprogram control registers */
658         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
659         /* Check the hardware signature */
660         if (facs && s4_hardware_signature != facs->hardware_signature) {
661                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
662                         "cannot resume!\n");
663                 panic("ACPI S4 hardware signature mismatch");
664         }
665         /* Restore the NVS memory area */
666         suspend_nvs_restore();
667         /* Allow EC transactions to happen. */
668         acpi_ec_unblock_transactions_early();
669 }
670
671 static void acpi_pm_thaw(void)
672 {
673         acpi_ec_unblock_transactions();
674         acpi_enable_all_runtime_gpes();
675 }
676
677 static const struct platform_hibernation_ops acpi_hibernation_ops = {
678         .begin = acpi_hibernation_begin,
679         .end = acpi_pm_end,
680         .pre_snapshot = acpi_pm_prepare,
681         .finish = acpi_pm_finish,
682         .prepare = acpi_pm_prepare,
683         .enter = acpi_hibernation_enter,
684         .leave = acpi_hibernation_leave,
685         .pre_restore = acpi_pm_freeze,
686         .restore_cleanup = acpi_pm_thaw,
687 };
688
689 /**
690  *      acpi_hibernation_begin_old - Set the target system sleep state to
691  *              ACPI_STATE_S4 and execute the _PTS control method.  This
692  *              function is used if the pre-ACPI 2.0 suspend ordering has been
693  *              requested.
694  */
695 static int acpi_hibernation_begin_old(void)
696 {
697         int error;
698         /*
699          * The _TTS object should always be evaluated before the _PTS object.
700          * When the old_suspended_ordering is true, the _PTS object is
701          * evaluated in the acpi_sleep_prepare.
702          */
703         acpi_sleep_tts_switch(ACPI_STATE_S4);
704
705         error = acpi_sleep_prepare(ACPI_STATE_S4);
706
707         if (!error) {
708                 if (!nvs_nosave)
709                         error = suspend_nvs_alloc();
710                 if (!error)
711                         acpi_target_sleep_state = ACPI_STATE_S4;
712         }
713         return error;
714 }
715
716 /*
717  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
718  * been requested.
719  */
720 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
721         .begin = acpi_hibernation_begin_old,
722         .end = acpi_pm_end,
723         .pre_snapshot = acpi_pm_pre_suspend,
724         .prepare = acpi_pm_freeze,
725         .finish = acpi_pm_finish,
726         .enter = acpi_hibernation_enter,
727         .leave = acpi_hibernation_leave,
728         .pre_restore = acpi_pm_freeze,
729         .restore_cleanup = acpi_pm_thaw,
730         .recover = acpi_pm_finish,
731 };
732
733 static void acpi_sleep_hibernate_setup(void)
734 {
735         acpi_status status;
736         u8 type_a, type_b;
737
738         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
739         if (ACPI_FAILURE(status))
740                 return;
741
742         hibernation_set_ops(old_suspend_ordering ?
743                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
744         sleep_states[ACPI_STATE_S4] = 1;
745         pr_cont(KERN_CONT " S4");
746         if (nosigcheck)
747                 return;
748
749         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
750         if (facs)
751                 s4_hardware_signature = facs->hardware_signature;
752 }
753 #else /* !CONFIG_HIBERNATION */
754 static inline void acpi_sleep_hibernate_setup(void) {}
755 #endif /* !CONFIG_HIBERNATION */
756
757 int acpi_suspend(u32 acpi_state)
758 {
759         suspend_state_t states[] = {
760                 [1] = PM_SUSPEND_STANDBY,
761                 [3] = PM_SUSPEND_MEM,
762                 [5] = PM_SUSPEND_MAX
763         };
764
765         if (acpi_state < 6 && states[acpi_state])
766                 return pm_suspend(states[acpi_state]);
767         if (acpi_state == 4)
768                 return hibernate();
769         return -EINVAL;
770 }
771
772 static void acpi_power_off_prepare(void)
773 {
774         /* Prepare to power off the system */
775         acpi_sleep_prepare(ACPI_STATE_S5);
776         acpi_disable_all_gpes();
777 }
778
779 static void acpi_power_off(void)
780 {
781         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
782         printk(KERN_DEBUG "%s called\n", __func__);
783         local_irq_disable();
784         acpi_enter_sleep_state(ACPI_STATE_S5);
785 }
786
787 int __init acpi_sleep_init(void)
788 {
789         acpi_status status;
790         u8 type_a, type_b;
791
792         if (acpi_disabled)
793                 return 0;
794
795         acpi_sleep_dmi_check();
796
797         sleep_states[ACPI_STATE_S0] = 1;
798         pr_info(PREFIX "(supports S0");
799
800         acpi_sleep_suspend_setup();
801         acpi_sleep_hibernate_setup();
802
803         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
804         if (ACPI_SUCCESS(status)) {
805                 sleep_states[ACPI_STATE_S5] = 1;
806                 pr_cont(" S5");
807                 pm_power_off_prepare = acpi_power_off_prepare;
808                 pm_power_off = acpi_power_off;
809         }
810         pr_cont(")\n");
811         /*
812          * Register the tts_notifier to reboot notifier list so that the _TTS
813          * object can also be evaluated when the system enters S5.
814          */
815         register_reboot_notifier(&tts_notifier);
816         return 0;
817 }