ACPI / APEI: fix error return code in ghes_probe()
[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 VGN-FW21M",
197         .matches = {
198                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
199                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
200                 },
201         },
202         {
203         .callback = init_nvs_nosave,
204         .ident = "Sony Vaio VPCEB17FX",
205         .matches = {
206                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
207                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
208                 },
209         },
210         {
211         .callback = init_nvs_nosave,
212         .ident = "Sony Vaio VGN-SR11M",
213         .matches = {
214                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
215                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
216                 },
217         },
218         {
219         .callback = init_nvs_nosave,
220         .ident = "Everex StepNote Series",
221         .matches = {
222                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
223                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
224                 },
225         },
226         {
227         .callback = init_nvs_nosave,
228         .ident = "Sony Vaio VPCEB1Z1E",
229         .matches = {
230                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
231                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
232                 },
233         },
234         {
235         .callback = init_nvs_nosave,
236         .ident = "Sony Vaio VGN-NW130D",
237         .matches = {
238                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
239                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
240                 },
241         },
242         {
243         .callback = init_nvs_nosave,
244         .ident = "Sony Vaio VPCCW29FX",
245         .matches = {
246                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
247                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
248                 },
249         },
250         {
251         .callback = init_nvs_nosave,
252         .ident = "Averatec AV1020-ED2",
253         .matches = {
254                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
255                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
256                 },
257         },
258         {
259         .callback = init_old_suspend_ordering,
260         .ident = "Asus A8N-SLI DELUXE",
261         .matches = {
262                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
263                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
264                 },
265         },
266         {
267         .callback = init_old_suspend_ordering,
268         .ident = "Asus A8N-SLI Premium",
269         .matches = {
270                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
271                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
272                 },
273         },
274         {
275         .callback = init_nvs_nosave,
276         .ident = "Sony Vaio VGN-SR26GN_P",
277         .matches = {
278                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
279                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
280                 },
281         },
282         {
283         .callback = init_nvs_nosave,
284         .ident = "Sony Vaio VPCEB1S1E",
285         .matches = {
286                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
287                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
288                 },
289         },
290         {
291         .callback = init_nvs_nosave,
292         .ident = "Sony Vaio VGN-FW520F",
293         .matches = {
294                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
295                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
296                 },
297         },
298         {
299         .callback = init_nvs_nosave,
300         .ident = "Asus K54C",
301         .matches = {
302                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
303                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
304                 },
305         },
306         {
307         .callback = init_nvs_nosave,
308         .ident = "Asus K54HR",
309         .matches = {
310                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
311                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
312                 },
313         },
314         {},
315 };
316
317 static void acpi_sleep_dmi_check(void)
318 {
319         dmi_check_system(acpisleep_dmi_table);
320 }
321
322 /**
323  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
324  */
325 static int acpi_pm_freeze(void)
326 {
327         acpi_disable_all_gpes();
328         acpi_os_wait_events_complete();
329         acpi_ec_block_transactions();
330         return 0;
331 }
332
333 /**
334  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
335  */
336 static int acpi_pm_pre_suspend(void)
337 {
338         acpi_pm_freeze();
339         return suspend_nvs_save();
340 }
341
342 /**
343  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
344  *
345  *      If necessary, set the firmware waking vector and do arch-specific
346  *      nastiness to get the wakeup code to the waking vector.
347  */
348 static int __acpi_pm_prepare(void)
349 {
350         int error = acpi_sleep_prepare(acpi_target_sleep_state);
351         if (error)
352                 acpi_target_sleep_state = ACPI_STATE_S0;
353
354         return error;
355 }
356
357 /**
358  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
359  *              state and disable the GPEs.
360  */
361 static int acpi_pm_prepare(void)
362 {
363         int error = __acpi_pm_prepare();
364         if (!error)
365                 error = acpi_pm_pre_suspend();
366
367         return error;
368 }
369
370 static int find_powerf_dev(struct device *dev, void *data)
371 {
372         struct acpi_device *device = to_acpi_device(dev);
373         const char *hid = acpi_device_hid(device);
374
375         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
376 }
377
378 /**
379  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
380  *
381  *      This is called after we wake back up (or if entering the sleep state
382  *      failed).
383  */
384 static void acpi_pm_finish(void)
385 {
386         struct device *pwr_btn_dev;
387         u32 acpi_state = acpi_target_sleep_state;
388
389         acpi_ec_unblock_transactions();
390         suspend_nvs_free();
391
392         if (acpi_state == ACPI_STATE_S0)
393                 return;
394
395         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
396                 acpi_state);
397         acpi_disable_wakeup_devices(acpi_state);
398         acpi_leave_sleep_state(acpi_state);
399
400         /* reset firmware waking vector */
401         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
402
403         acpi_target_sleep_state = ACPI_STATE_S0;
404
405         acpi_resume_power_resources();
406
407         /* If we were woken with the fixed power button, provide a small
408          * hint to userspace in the form of a wakeup event on the fixed power
409          * button device (if it can be found).
410          *
411          * We delay the event generation til now, as the PM layer requires
412          * timekeeping to be running before we generate events. */
413         if (!pwr_btn_event_pending)
414                 return;
415
416         pwr_btn_event_pending = false;
417         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
418                                       find_powerf_dev);
419         if (pwr_btn_dev) {
420                 pm_wakeup_event(pwr_btn_dev, 0);
421                 put_device(pwr_btn_dev);
422         }
423 }
424
425 /**
426  *      acpi_pm_end - Finish up suspend sequence.
427  */
428 static void acpi_pm_end(void)
429 {
430         /*
431          * This is necessary in case acpi_pm_finish() is not called during a
432          * failing transition to a sleep state.
433          */
434         acpi_target_sleep_state = ACPI_STATE_S0;
435         acpi_sleep_tts_switch(acpi_target_sleep_state);
436 }
437 #else /* !CONFIG_ACPI_SLEEP */
438 #define acpi_target_sleep_state ACPI_STATE_S0
439 static inline void acpi_sleep_dmi_check(void) {}
440 #endif /* CONFIG_ACPI_SLEEP */
441
442 #ifdef CONFIG_SUSPEND
443 static u32 acpi_suspend_states[] = {
444         [PM_SUSPEND_ON] = ACPI_STATE_S0,
445         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
446         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
447         [PM_SUSPEND_MAX] = ACPI_STATE_S5
448 };
449
450 /**
451  *      acpi_suspend_begin - Set the target system sleep state to the state
452  *              associated with given @pm_state, if supported.
453  */
454 static int acpi_suspend_begin(suspend_state_t pm_state)
455 {
456         u32 acpi_state = acpi_suspend_states[pm_state];
457         int error = 0;
458
459         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
460         if (error)
461                 return error;
462
463         if (sleep_states[acpi_state]) {
464                 acpi_target_sleep_state = acpi_state;
465                 acpi_sleep_tts_switch(acpi_target_sleep_state);
466         } else {
467                 printk(KERN_ERR "ACPI does not support this state: %d\n",
468                         pm_state);
469                 error = -ENOSYS;
470         }
471         return error;
472 }
473
474 /**
475  *      acpi_suspend_enter - Actually enter a sleep state.
476  *      @pm_state: ignored
477  *
478  *      Flush caches and go to sleep. For STR we have to call arch-specific
479  *      assembly, which in turn call acpi_enter_sleep_state().
480  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
481  */
482 static int acpi_suspend_enter(suspend_state_t pm_state)
483 {
484         acpi_status status = AE_OK;
485         u32 acpi_state = acpi_target_sleep_state;
486         int error;
487
488         ACPI_FLUSH_CPU_CACHE();
489
490         switch (acpi_state) {
491         case ACPI_STATE_S1:
492                 barrier();
493                 status = acpi_enter_sleep_state(acpi_state);
494                 break;
495
496         case ACPI_STATE_S3:
497                 error = acpi_suspend_lowlevel();
498                 if (error)
499                         return error;
500                 pr_info(PREFIX "Low-level resume complete\n");
501                 break;
502         }
503
504         /* This violates the spec but is required for bug compatibility. */
505         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
506
507         /* Reprogram control registers */
508         acpi_leave_sleep_state_prep(acpi_state);
509
510         /* ACPI 3.0 specs (P62) says that it's the responsibility
511          * of the OSPM to clear the status bit [ implying that the
512          * POWER_BUTTON event should not reach userspace ]
513          *
514          * However, we do generate a small hint for userspace in the form of
515          * a wakeup event. We flag this condition for now and generate the
516          * event later, as we're currently too early in resume to be able to
517          * generate wakeup events.
518          */
519         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
520                 acpi_event_status pwr_btn_status;
521
522                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
523
524                 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
525                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
526                         /* Flag for later */
527                         pwr_btn_event_pending = true;
528                 }
529         }
530
531         /*
532          * Disable and clear GPE status before interrupt is enabled. Some GPEs
533          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
534          * acpi_leave_sleep_state will reenable specific GPEs later
535          */
536         acpi_disable_all_gpes();
537         /* Allow EC transactions to happen. */
538         acpi_ec_unblock_transactions_early();
539
540         suspend_nvs_restore();
541
542         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
543 }
544
545 static int acpi_suspend_state_valid(suspend_state_t pm_state)
546 {
547         u32 acpi_state;
548
549         switch (pm_state) {
550         case PM_SUSPEND_ON:
551         case PM_SUSPEND_STANDBY:
552         case PM_SUSPEND_MEM:
553                 acpi_state = acpi_suspend_states[pm_state];
554
555                 return sleep_states[acpi_state];
556         default:
557                 return 0;
558         }
559 }
560
561 static const struct platform_suspend_ops acpi_suspend_ops = {
562         .valid = acpi_suspend_state_valid,
563         .begin = acpi_suspend_begin,
564         .prepare_late = acpi_pm_prepare,
565         .enter = acpi_suspend_enter,
566         .wake = acpi_pm_finish,
567         .end = acpi_pm_end,
568 };
569
570 /**
571  *      acpi_suspend_begin_old - Set the target system sleep state to the
572  *              state associated with given @pm_state, if supported, and
573  *              execute the _PTS control method.  This function is used if the
574  *              pre-ACPI 2.0 suspend ordering has been requested.
575  */
576 static int acpi_suspend_begin_old(suspend_state_t pm_state)
577 {
578         int error = acpi_suspend_begin(pm_state);
579         if (!error)
580                 error = __acpi_pm_prepare();
581
582         return error;
583 }
584
585 /*
586  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
587  * been requested.
588  */
589 static const struct platform_suspend_ops acpi_suspend_ops_old = {
590         .valid = acpi_suspend_state_valid,
591         .begin = acpi_suspend_begin_old,
592         .prepare_late = acpi_pm_pre_suspend,
593         .enter = acpi_suspend_enter,
594         .wake = acpi_pm_finish,
595         .end = acpi_pm_end,
596         .recover = acpi_pm_finish,
597 };
598
599 static void acpi_sleep_suspend_setup(void)
600 {
601         int i;
602
603         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
604                 acpi_status status;
605                 u8 type_a, type_b;
606
607                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
608                 if (ACPI_SUCCESS(status)) {
609                         sleep_states[i] = 1;
610                 }
611         }
612
613         suspend_set_ops(old_suspend_ordering ?
614                 &acpi_suspend_ops_old : &acpi_suspend_ops);
615 }
616 #else /* !CONFIG_SUSPEND */
617 static inline void acpi_sleep_suspend_setup(void) {}
618 #endif /* !CONFIG_SUSPEND */
619
620 #ifdef CONFIG_HIBERNATION
621 static unsigned long s4_hardware_signature;
622 static struct acpi_table_facs *facs;
623 static bool nosigcheck;
624
625 void __init acpi_no_s4_hw_signature(void)
626 {
627         nosigcheck = true;
628 }
629
630 static int acpi_hibernation_begin(void)
631 {
632         int error;
633
634         error = nvs_nosave ? 0 : suspend_nvs_alloc();
635         if (!error) {
636                 acpi_target_sleep_state = ACPI_STATE_S4;
637                 acpi_sleep_tts_switch(acpi_target_sleep_state);
638         }
639
640         return error;
641 }
642
643 static int acpi_hibernation_enter(void)
644 {
645         acpi_status status = AE_OK;
646
647         ACPI_FLUSH_CPU_CACHE();
648
649         /* This shouldn't return.  If it returns, we have a problem */
650         status = acpi_enter_sleep_state(ACPI_STATE_S4);
651         /* Reprogram control registers */
652         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
653
654         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
655 }
656
657 static void acpi_hibernation_leave(void)
658 {
659         /*
660          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
661          * enable it here.
662          */
663         acpi_enable();
664         /* Reprogram control registers */
665         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
666         /* Check the hardware signature */
667         if (facs && s4_hardware_signature != facs->hardware_signature) {
668                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
669                         "cannot resume!\n");
670                 panic("ACPI S4 hardware signature mismatch");
671         }
672         /* Restore the NVS memory area */
673         suspend_nvs_restore();
674         /* Allow EC transactions to happen. */
675         acpi_ec_unblock_transactions_early();
676 }
677
678 static void acpi_pm_thaw(void)
679 {
680         acpi_ec_unblock_transactions();
681         acpi_enable_all_runtime_gpes();
682 }
683
684 static const struct platform_hibernation_ops acpi_hibernation_ops = {
685         .begin = acpi_hibernation_begin,
686         .end = acpi_pm_end,
687         .pre_snapshot = acpi_pm_prepare,
688         .finish = acpi_pm_finish,
689         .prepare = acpi_pm_prepare,
690         .enter = acpi_hibernation_enter,
691         .leave = acpi_hibernation_leave,
692         .pre_restore = acpi_pm_freeze,
693         .restore_cleanup = acpi_pm_thaw,
694 };
695
696 /**
697  *      acpi_hibernation_begin_old - Set the target system sleep state to
698  *              ACPI_STATE_S4 and execute the _PTS control method.  This
699  *              function is used if the pre-ACPI 2.0 suspend ordering has been
700  *              requested.
701  */
702 static int acpi_hibernation_begin_old(void)
703 {
704         int error;
705         /*
706          * The _TTS object should always be evaluated before the _PTS object.
707          * When the old_suspended_ordering is true, the _PTS object is
708          * evaluated in the acpi_sleep_prepare.
709          */
710         acpi_sleep_tts_switch(ACPI_STATE_S4);
711
712         error = acpi_sleep_prepare(ACPI_STATE_S4);
713
714         if (!error) {
715                 if (!nvs_nosave)
716                         error = suspend_nvs_alloc();
717                 if (!error)
718                         acpi_target_sleep_state = ACPI_STATE_S4;
719         }
720         return error;
721 }
722
723 /*
724  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
725  * been requested.
726  */
727 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
728         .begin = acpi_hibernation_begin_old,
729         .end = acpi_pm_end,
730         .pre_snapshot = acpi_pm_pre_suspend,
731         .prepare = acpi_pm_freeze,
732         .finish = acpi_pm_finish,
733         .enter = acpi_hibernation_enter,
734         .leave = acpi_hibernation_leave,
735         .pre_restore = acpi_pm_freeze,
736         .restore_cleanup = acpi_pm_thaw,
737         .recover = acpi_pm_finish,
738 };
739
740 static void acpi_sleep_hibernate_setup(void)
741 {
742         acpi_status status;
743         u8 type_a, type_b;
744
745         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
746         if (ACPI_FAILURE(status))
747                 return;
748
749         hibernation_set_ops(old_suspend_ordering ?
750                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
751         sleep_states[ACPI_STATE_S4] = 1;
752         if (nosigcheck)
753                 return;
754
755         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
756         if (facs)
757                 s4_hardware_signature = facs->hardware_signature;
758 }
759 #else /* !CONFIG_HIBERNATION */
760 static inline void acpi_sleep_hibernate_setup(void) {}
761 #endif /* !CONFIG_HIBERNATION */
762
763 int acpi_suspend(u32 acpi_state)
764 {
765         suspend_state_t states[] = {
766                 [1] = PM_SUSPEND_STANDBY,
767                 [3] = PM_SUSPEND_MEM,
768                 [5] = PM_SUSPEND_MAX
769         };
770
771         if (acpi_state < 6 && states[acpi_state])
772                 return pm_suspend(states[acpi_state]);
773         if (acpi_state == 4)
774                 return hibernate();
775         return -EINVAL;
776 }
777
778 static void acpi_power_off_prepare(void)
779 {
780         /* Prepare to power off the system */
781         acpi_sleep_prepare(ACPI_STATE_S5);
782         acpi_disable_all_gpes();
783 }
784
785 static void acpi_power_off(void)
786 {
787         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
788         printk(KERN_DEBUG "%s called\n", __func__);
789         local_irq_disable();
790         acpi_enter_sleep_state(ACPI_STATE_S5);
791 }
792
793 int __init acpi_sleep_init(void)
794 {
795         acpi_status status;
796         u8 type_a, type_b;
797         char supported[ACPI_S_STATE_COUNT * 3 + 1];
798         char *pos = supported;
799         int i;
800
801         if (acpi_disabled)
802                 return 0;
803
804         acpi_sleep_dmi_check();
805
806         sleep_states[ACPI_STATE_S0] = 1;
807
808         acpi_sleep_suspend_setup();
809         acpi_sleep_hibernate_setup();
810
811         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
812         if (ACPI_SUCCESS(status)) {
813                 sleep_states[ACPI_STATE_S5] = 1;
814                 pm_power_off_prepare = acpi_power_off_prepare;
815                 pm_power_off = acpi_power_off;
816         }
817
818         supported[0] = 0;
819         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
820                 if (sleep_states[i])
821                         pos += sprintf(pos, " S%d", i);
822         }
823         pr_info(PREFIX "(supports%s)\n", supported);
824
825         /*
826          * Register the tts_notifier to reboot notifier list so that the _TTS
827          * object can also be evaluated when the system enters S5.
828          */
829         register_reboot_notifier(&tts_notifier);
830         return 0;
831 }