Revert "ARM: tegra: tegratab: dummy change"
[linux-2.6.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 #include <linux/pm_runtime.h>
22
23 #include <asm/io.h>
24
25 #include <acpi/acpi_bus.h>
26 #include <acpi/acpi_drivers.h>
27
28 #include "internal.h"
29 #include "sleep.h"
30
31 u8 wake_sleep_flags = ACPI_NO_OPTIONAL_METHODS;
32 static unsigned int gts, bfs;
33 static int set_param_wake_flag(const char *val, struct kernel_param *kp)
34 {
35         int ret = param_set_int(val, kp);
36
37         if (ret)
38                 return ret;
39
40         if (kp->arg == (const char *)&gts) {
41                 if (gts)
42                         wake_sleep_flags |= ACPI_EXECUTE_GTS;
43                 else
44                         wake_sleep_flags &= ~ACPI_EXECUTE_GTS;
45         }
46         if (kp->arg == (const char *)&bfs) {
47                 if (bfs)
48                         wake_sleep_flags |= ACPI_EXECUTE_BFS;
49                 else
50                         wake_sleep_flags &= ~ACPI_EXECUTE_BFS;
51         }
52         return ret;
53 }
54 module_param_call(gts, set_param_wake_flag, param_get_int, &gts, 0644);
55 module_param_call(bfs, set_param_wake_flag, param_get_int, &bfs, 0644);
56 MODULE_PARM_DESC(gts, "Enable evaluation of _GTS on suspend.");
57 MODULE_PARM_DESC(bfs, "Enable evaluation of _BFS on resume".);
58
59 static u8 sleep_states[ACPI_S_STATE_COUNT];
60
61 static void acpi_sleep_tts_switch(u32 acpi_state)
62 {
63         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
64         struct acpi_object_list arg_list = { 1, &in_arg };
65         acpi_status status = AE_OK;
66
67         in_arg.integer.value = acpi_state;
68         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
69         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
70                 /*
71                  * OS can't evaluate the _TTS object correctly. Some warning
72                  * message will be printed. But it won't break anything.
73                  */
74                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
75         }
76 }
77
78 static int tts_notify_reboot(struct notifier_block *this,
79                         unsigned long code, void *x)
80 {
81         acpi_sleep_tts_switch(ACPI_STATE_S5);
82         return NOTIFY_DONE;
83 }
84
85 static struct notifier_block tts_notifier = {
86         .notifier_call  = tts_notify_reboot,
87         .next           = NULL,
88         .priority       = 0,
89 };
90
91 static int acpi_sleep_prepare(u32 acpi_state)
92 {
93 #ifdef CONFIG_ACPI_SLEEP
94         /* do we have a wakeup address for S2 and S3? */
95         if (acpi_state == ACPI_STATE_S3) {
96                 if (!acpi_wakeup_address) {
97                         return -EFAULT;
98                 }
99                 acpi_set_firmware_waking_vector(
100                                 (acpi_physical_address)acpi_wakeup_address);
101
102         }
103         ACPI_FLUSH_CPU_CACHE();
104 #endif
105         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
106                 acpi_state);
107         acpi_enable_wakeup_devices(acpi_state);
108         acpi_enter_sleep_state_prep(acpi_state);
109         return 0;
110 }
111
112 #ifdef CONFIG_ACPI_SLEEP
113 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
114
115 /*
116  * The ACPI specification wants us to save NVS memory regions during hibernation
117  * and to restore them during the subsequent resume.  Windows does that also for
118  * suspend to RAM.  However, it is known that this mechanism does not work on
119  * all machines, so we allow the user to disable it with the help of the
120  * 'acpi_sleep=nonvs' kernel command line option.
121  */
122 static bool nvs_nosave;
123
124 void __init acpi_nvs_nosave(void)
125 {
126         nvs_nosave = true;
127 }
128
129 /*
130  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
131  * user to request that behavior by using the 'acpi_old_suspend_ordering'
132  * kernel command line option that causes the following variable to be set.
133  */
134 static bool old_suspend_ordering;
135
136 void __init acpi_old_suspend_ordering(void)
137 {
138         old_suspend_ordering = true;
139 }
140
141 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
142 {
143         acpi_old_suspend_ordering();
144         return 0;
145 }
146
147 static int __init init_nvs_nosave(const struct dmi_system_id *d)
148 {
149         acpi_nvs_nosave();
150         return 0;
151 }
152
153 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
154         {
155         .callback = init_old_suspend_ordering,
156         .ident = "Abit KN9 (nForce4 variant)",
157         .matches = {
158                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
159                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
160                 },
161         },
162         {
163         .callback = init_old_suspend_ordering,
164         .ident = "HP xw4600 Workstation",
165         .matches = {
166                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
167                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
168                 },
169         },
170         {
171         .callback = init_old_suspend_ordering,
172         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
173         .matches = {
174                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
175                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
176                 },
177         },
178         {
179         .callback = init_old_suspend_ordering,
180         .ident = "Panasonic CF51-2L",
181         .matches = {
182                 DMI_MATCH(DMI_BOARD_VENDOR,
183                                 "Matsushita Electric Industrial Co.,Ltd."),
184                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
185                 },
186         },
187         {
188         .callback = init_nvs_nosave,
189         .ident = "Sony Vaio VGN-FW41E_H",
190         .matches = {
191                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
192                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
193                 },
194         },
195         {
196         .callback = init_nvs_nosave,
197         .ident = "Sony Vaio VGN-FW21E",
198         .matches = {
199                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
200                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
201                 },
202         },
203         {
204         .callback = init_nvs_nosave,
205         .ident = "Sony Vaio VPCEB17FX",
206         .matches = {
207                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
208                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
209                 },
210         },
211         {
212         .callback = init_nvs_nosave,
213         .ident = "Sony Vaio VGN-SR11M",
214         .matches = {
215                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
216                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
217                 },
218         },
219         {
220         .callback = init_nvs_nosave,
221         .ident = "Everex StepNote Series",
222         .matches = {
223                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
224                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
225                 },
226         },
227         {
228         .callback = init_nvs_nosave,
229         .ident = "Sony Vaio VPCEB1Z1E",
230         .matches = {
231                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
232                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
233                 },
234         },
235         {
236         .callback = init_nvs_nosave,
237         .ident = "Sony Vaio VGN-NW130D",
238         .matches = {
239                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
240                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
241                 },
242         },
243         {
244         .callback = init_nvs_nosave,
245         .ident = "Sony Vaio VPCCW29FX",
246         .matches = {
247                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
248                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
249                 },
250         },
251         {
252         .callback = init_nvs_nosave,
253         .ident = "Averatec AV1020-ED2",
254         .matches = {
255                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
256                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
257                 },
258         },
259         {
260         .callback = init_old_suspend_ordering,
261         .ident = "Asus A8N-SLI DELUXE",
262         .matches = {
263                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
264                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
265                 },
266         },
267         {
268         .callback = init_old_suspend_ordering,
269         .ident = "Asus A8N-SLI Premium",
270         .matches = {
271                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
272                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
273                 },
274         },
275         {
276         .callback = init_nvs_nosave,
277         .ident = "Sony Vaio VGN-SR26GN_P",
278         .matches = {
279                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
280                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
281                 },
282         },
283         {
284         .callback = init_nvs_nosave,
285         .ident = "Sony Vaio VPCEB1S1E",
286         .matches = {
287                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
288                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
289                 },
290         },
291         {
292         .callback = init_nvs_nosave,
293         .ident = "Sony Vaio VGN-FW520F",
294         .matches = {
295                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
296                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
297                 },
298         },
299         {
300         .callback = init_nvs_nosave,
301         .ident = "Asus K54C",
302         .matches = {
303                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
304                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
305                 },
306         },
307         {
308         .callback = init_nvs_nosave,
309         .ident = "Asus K54HR",
310         .matches = {
311                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
312                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
313                 },
314         },
315         {},
316 };
317
318 static void acpi_sleep_dmi_check(void)
319 {
320         dmi_check_system(acpisleep_dmi_table);
321 }
322
323 /**
324  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
325  */
326 static int acpi_pm_freeze(void)
327 {
328         acpi_disable_all_gpes();
329         acpi_os_wait_events_complete(NULL);
330         acpi_ec_block_transactions();
331         return 0;
332 }
333
334 /**
335  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
336  */
337 static int acpi_pm_pre_suspend(void)
338 {
339         acpi_pm_freeze();
340         return suspend_nvs_save();
341 }
342
343 /**
344  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
345  *
346  *      If necessary, set the firmware waking vector and do arch-specific
347  *      nastiness to get the wakeup code to the waking vector.
348  */
349 static int __acpi_pm_prepare(void)
350 {
351         int error = acpi_sleep_prepare(acpi_target_sleep_state);
352         if (error)
353                 acpi_target_sleep_state = ACPI_STATE_S0;
354
355         return error;
356 }
357
358 /**
359  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
360  *              state and disable the GPEs.
361  */
362 static int acpi_pm_prepare(void)
363 {
364         int error = __acpi_pm_prepare();
365         if (!error)
366                 error = acpi_pm_pre_suspend();
367
368         return error;
369 }
370
371 /**
372  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
373  *
374  *      This is called after we wake back up (or if entering the sleep state
375  *      failed).
376  */
377 static void acpi_pm_finish(void)
378 {
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
398 /**
399  *      acpi_pm_end - Finish up suspend sequence.
400  */
401 static void acpi_pm_end(void)
402 {
403         /*
404          * This is necessary in case acpi_pm_finish() is not called during a
405          * failing transition to a sleep state.
406          */
407         acpi_target_sleep_state = ACPI_STATE_S0;
408         acpi_sleep_tts_switch(acpi_target_sleep_state);
409 }
410 #else /* !CONFIG_ACPI_SLEEP */
411 #define acpi_target_sleep_state ACPI_STATE_S0
412 static inline void acpi_sleep_dmi_check(void) {}
413 #endif /* CONFIG_ACPI_SLEEP */
414
415 #ifdef CONFIG_SUSPEND
416 static u32 acpi_suspend_states[] = {
417         [PM_SUSPEND_ON] = ACPI_STATE_S0,
418         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
419         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
420         [PM_SUSPEND_MAX] = ACPI_STATE_S5
421 };
422
423 /**
424  *      acpi_suspend_begin - Set the target system sleep state to the state
425  *              associated with given @pm_state, if supported.
426  */
427 static int acpi_suspend_begin(suspend_state_t pm_state)
428 {
429         u32 acpi_state = acpi_suspend_states[pm_state];
430         int error = 0;
431
432         error = nvs_nosave ? 0 : suspend_nvs_alloc();
433         if (error)
434                 return error;
435
436         if (sleep_states[acpi_state]) {
437                 acpi_target_sleep_state = acpi_state;
438                 acpi_sleep_tts_switch(acpi_target_sleep_state);
439         } else {
440                 printk(KERN_ERR "ACPI does not support this state: %d\n",
441                         pm_state);
442                 error = -ENOSYS;
443         }
444         return error;
445 }
446
447 /**
448  *      acpi_suspend_enter - Actually enter a sleep state.
449  *      @pm_state: ignored
450  *
451  *      Flush caches and go to sleep. For STR we have to call arch-specific
452  *      assembly, which in turn call acpi_enter_sleep_state().
453  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
454  */
455 static int acpi_suspend_enter(suspend_state_t pm_state)
456 {
457         acpi_status status = AE_OK;
458         u32 acpi_state = acpi_target_sleep_state;
459         int error;
460
461         ACPI_FLUSH_CPU_CACHE();
462
463         switch (acpi_state) {
464         case ACPI_STATE_S1:
465                 barrier();
466                 status = acpi_enter_sleep_state(acpi_state, wake_sleep_flags);
467                 break;
468
469         case ACPI_STATE_S3:
470                 error = acpi_suspend_lowlevel();
471                 if (error)
472                         return error;
473                 pr_info(PREFIX "Low-level resume complete\n");
474                 break;
475         }
476
477         /* This violates the spec but is required for bug compatibility. */
478         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
479
480         /* Reprogram control registers and execute _BFS */
481         acpi_leave_sleep_state_prep(acpi_state, wake_sleep_flags);
482
483         /* ACPI 3.0 specs (P62) says that it's the responsibility
484          * of the OSPM to clear the status bit [ implying that the
485          * POWER_BUTTON event should not reach userspace ]
486          */
487         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
488                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
489
490         /*
491          * Disable and clear GPE status before interrupt is enabled. Some GPEs
492          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
493          * acpi_leave_sleep_state will reenable specific GPEs later
494          */
495         acpi_disable_all_gpes();
496         /* Allow EC transactions to happen. */
497         acpi_ec_unblock_transactions_early();
498
499         suspend_nvs_restore();
500
501         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
502 }
503
504 static int acpi_suspend_state_valid(suspend_state_t pm_state)
505 {
506         u32 acpi_state;
507
508         switch (pm_state) {
509         case PM_SUSPEND_ON:
510         case PM_SUSPEND_STANDBY:
511         case PM_SUSPEND_MEM:
512                 acpi_state = acpi_suspend_states[pm_state];
513
514                 return sleep_states[acpi_state];
515         default:
516                 return 0;
517         }
518 }
519
520 static const struct platform_suspend_ops acpi_suspend_ops = {
521         .valid = acpi_suspend_state_valid,
522         .begin = acpi_suspend_begin,
523         .prepare_late = acpi_pm_prepare,
524         .enter = acpi_suspend_enter,
525         .wake = acpi_pm_finish,
526         .end = acpi_pm_end,
527 };
528
529 /**
530  *      acpi_suspend_begin_old - Set the target system sleep state to the
531  *              state associated with given @pm_state, if supported, and
532  *              execute the _PTS control method.  This function is used if the
533  *              pre-ACPI 2.0 suspend ordering has been requested.
534  */
535 static int acpi_suspend_begin_old(suspend_state_t pm_state)
536 {
537         int error = acpi_suspend_begin(pm_state);
538         if (!error)
539                 error = __acpi_pm_prepare();
540
541         return error;
542 }
543
544 /*
545  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
546  * been requested.
547  */
548 static const struct platform_suspend_ops acpi_suspend_ops_old = {
549         .valid = acpi_suspend_state_valid,
550         .begin = acpi_suspend_begin_old,
551         .prepare_late = acpi_pm_pre_suspend,
552         .enter = acpi_suspend_enter,
553         .wake = acpi_pm_finish,
554         .end = acpi_pm_end,
555         .recover = acpi_pm_finish,
556 };
557 #endif /* CONFIG_SUSPEND */
558
559 #ifdef CONFIG_HIBERNATION
560 static unsigned long s4_hardware_signature;
561 static struct acpi_table_facs *facs;
562 static bool nosigcheck;
563
564 void __init acpi_no_s4_hw_signature(void)
565 {
566         nosigcheck = true;
567 }
568
569 static int acpi_hibernation_begin(void)
570 {
571         int error;
572
573         error = nvs_nosave ? 0 : suspend_nvs_alloc();
574         if (!error) {
575                 acpi_target_sleep_state = ACPI_STATE_S4;
576                 acpi_sleep_tts_switch(acpi_target_sleep_state);
577         }
578
579         return error;
580 }
581
582 static int acpi_hibernation_enter(void)
583 {
584         acpi_status status = AE_OK;
585
586         ACPI_FLUSH_CPU_CACHE();
587
588         /* This shouldn't return.  If it returns, we have a problem */
589         status = acpi_enter_sleep_state(ACPI_STATE_S4, wake_sleep_flags);
590         /* Reprogram control registers and execute _BFS */
591         acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
592
593         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
594 }
595
596 static void acpi_hibernation_leave(void)
597 {
598         /*
599          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
600          * enable it here.
601          */
602         acpi_enable();
603         /* Reprogram control registers and execute _BFS */
604         acpi_leave_sleep_state_prep(ACPI_STATE_S4, wake_sleep_flags);
605         /* Check the hardware signature */
606         if (facs && s4_hardware_signature != facs->hardware_signature) {
607                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
608                         "cannot resume!\n");
609                 panic("ACPI S4 hardware signature mismatch");
610         }
611         /* Restore the NVS memory area */
612         suspend_nvs_restore();
613         /* Allow EC transactions to happen. */
614         acpi_ec_unblock_transactions_early();
615 }
616
617 static void acpi_pm_thaw(void)
618 {
619         acpi_ec_unblock_transactions();
620         acpi_enable_all_runtime_gpes();
621 }
622
623 static const struct platform_hibernation_ops acpi_hibernation_ops = {
624         .begin = acpi_hibernation_begin,
625         .end = acpi_pm_end,
626         .pre_snapshot = acpi_pm_prepare,
627         .finish = acpi_pm_finish,
628         .prepare = acpi_pm_prepare,
629         .enter = acpi_hibernation_enter,
630         .leave = acpi_hibernation_leave,
631         .pre_restore = acpi_pm_freeze,
632         .restore_cleanup = acpi_pm_thaw,
633 };
634
635 /**
636  *      acpi_hibernation_begin_old - Set the target system sleep state to
637  *              ACPI_STATE_S4 and execute the _PTS control method.  This
638  *              function is used if the pre-ACPI 2.0 suspend ordering has been
639  *              requested.
640  */
641 static int acpi_hibernation_begin_old(void)
642 {
643         int error;
644         /*
645          * The _TTS object should always be evaluated before the _PTS object.
646          * When the old_suspended_ordering is true, the _PTS object is
647          * evaluated in the acpi_sleep_prepare.
648          */
649         acpi_sleep_tts_switch(ACPI_STATE_S4);
650
651         error = acpi_sleep_prepare(ACPI_STATE_S4);
652
653         if (!error) {
654                 if (!nvs_nosave)
655                         error = suspend_nvs_alloc();
656                 if (!error)
657                         acpi_target_sleep_state = ACPI_STATE_S4;
658         }
659         return error;
660 }
661
662 /*
663  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
664  * been requested.
665  */
666 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
667         .begin = acpi_hibernation_begin_old,
668         .end = acpi_pm_end,
669         .pre_snapshot = acpi_pm_pre_suspend,
670         .prepare = acpi_pm_freeze,
671         .finish = acpi_pm_finish,
672         .enter = acpi_hibernation_enter,
673         .leave = acpi_hibernation_leave,
674         .pre_restore = acpi_pm_freeze,
675         .restore_cleanup = acpi_pm_thaw,
676         .recover = acpi_pm_finish,
677 };
678 #endif /* CONFIG_HIBERNATION */
679
680 int acpi_suspend(u32 acpi_state)
681 {
682         suspend_state_t states[] = {
683                 [1] = PM_SUSPEND_STANDBY,
684                 [3] = PM_SUSPEND_MEM,
685                 [5] = PM_SUSPEND_MAX
686         };
687
688         if (acpi_state < 6 && states[acpi_state])
689                 return pm_suspend(states[acpi_state]);
690         if (acpi_state == 4)
691                 return hibernate();
692         return -EINVAL;
693 }
694
695 #ifdef CONFIG_PM
696 /**
697  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
698  *              in the system sleep state given by %acpi_target_sleep_state
699  *      @dev: device to examine; its driver model wakeup flags control
700  *              whether it should be able to wake up the system
701  *      @d_min_p: used to store the upper limit of allowed states range
702  *      Return value: preferred power state of the device on success, -ENODEV on
703  *              failure (ie. if there's no 'struct acpi_device' for @dev)
704  *
705  *      Find the lowest power (highest number) ACPI device power state that
706  *      device @dev can be in while the system is in the sleep state represented
707  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
708  *      able to wake up the system from this sleep state.  If @d_min_p is set,
709  *      the highest power (lowest number) device power state of @dev allowed
710  *      in this system sleep state is stored at the location pointed to by it.
711  *
712  *      The caller must ensure that @dev is valid before using this function.
713  *      The caller is also responsible for figuring out if the device is
714  *      supposed to be able to wake up the system and passing this information
715  *      via @wake.
716  */
717
718 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
719 {
720         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
721         struct acpi_device *adev;
722         char acpi_method[] = "_SxD";
723         unsigned long long d_min, d_max;
724
725         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
726                 printk(KERN_DEBUG "ACPI handle has no context!\n");
727                 return -ENODEV;
728         }
729
730         acpi_method[2] = '0' + acpi_target_sleep_state;
731         /*
732          * If the sleep state is S0, we will return D3, but if the device has
733          * _S0W, we will use the value from _S0W
734          */
735         d_min = ACPI_STATE_D0;
736         d_max = ACPI_STATE_D3;
737
738         /*
739          * If present, _SxD methods return the minimum D-state (highest power
740          * state) we can use for the corresponding S-states.  Otherwise, the
741          * minimum D-state is D0 (ACPI 3.x).
742          *
743          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
744          * provided -- that's our fault recovery, we ignore retval.
745          */
746         if (acpi_target_sleep_state > ACPI_STATE_S0)
747                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
748
749         /*
750          * If _PRW says we can wake up the system from the target sleep state,
751          * the D-state returned by _SxD is sufficient for that (we assume a
752          * wakeup-aware driver if wake is set).  Still, if _SxW exists
753          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
754          * can wake the system.  _S0W may be valid, too.
755          */
756         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
757             (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
758              adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
759                 acpi_status status;
760
761                 acpi_method[3] = 'W';
762                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
763                                                 &d_max);
764                 if (ACPI_FAILURE(status)) {
765                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
766                             status != AE_NOT_FOUND)
767                                 d_max = d_min;
768                 } else if (d_max < d_min) {
769                         /* Warn the user of the broken DSDT */
770                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
771                                 acpi_method);
772                         /* Sanitize it */
773                         d_min = d_max;
774                 }
775         }
776
777         if (d_min_p)
778                 *d_min_p = d_min;
779         return d_max;
780 }
781 #endif /* CONFIG_PM */
782
783 #ifdef CONFIG_PM_SLEEP
784 /**
785  * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
786  * @phys_dev: Device to enable/disable the platform to wake-up the system for.
787  * @enable: Whether enable or disable the wake-up functionality.
788  *
789  * Find the ACPI device object corresponding to @pci_dev and try to
790  * enable/disable the GPE associated with it.
791  */
792 int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
793 {
794         struct acpi_device *dev;
795         acpi_handle handle;
796
797         if (!device_run_wake(phys_dev))
798                 return -EINVAL;
799
800         handle = DEVICE_ACPI_HANDLE(phys_dev);
801         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
802                 dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
803                         __func__);
804                 return -ENODEV;
805         }
806
807         if (enable) {
808                 acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
809                 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
810         } else {
811                 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
812                 acpi_disable_wakeup_device_power(dev);
813         }
814
815         return 0;
816 }
817
818 /**
819  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
820  *                                  capability of given device
821  *      @dev: device to handle
822  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
823  */
824 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
825 {
826         acpi_handle handle;
827         struct acpi_device *adev;
828         int error;
829
830         if (!device_can_wakeup(dev))
831                 return -EINVAL;
832
833         handle = DEVICE_ACPI_HANDLE(dev);
834         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
835                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
836                 return -ENODEV;
837         }
838
839         error = enable ?
840                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
841                 acpi_disable_wakeup_device_power(adev);
842         if (!error)
843                 dev_info(dev, "wake-up capability %s by ACPI\n",
844                                 enable ? "enabled" : "disabled");
845
846         return error;
847 }
848 #endif  /* CONFIG_PM_SLEEP */
849
850 static void acpi_power_off_prepare(void)
851 {
852         /* Prepare to power off the system */
853         acpi_sleep_prepare(ACPI_STATE_S5);
854         acpi_disable_all_gpes();
855 }
856
857 static void acpi_power_off(void)
858 {
859         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
860         printk(KERN_DEBUG "%s called\n", __func__);
861         local_irq_disable();
862         acpi_enter_sleep_state(ACPI_STATE_S5, wake_sleep_flags);
863 }
864
865 /*
866  * ACPI 2.0 created the optional _GTS and _BFS,
867  * but industry adoption has been neither rapid nor broad.
868  *
869  * Linux gets into trouble when it executes poorly validated
870  * paths through the BIOS, so disable _GTS and _BFS by default,
871  * but do speak up and offer the option to enable them.
872  */
873 static void __init acpi_gts_bfs_check(void)
874 {
875         acpi_handle dummy;
876
877         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__GTS, &dummy)))
878         {
879                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
880                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
881                         "please notify linux-acpi@vger.kernel.org\n");
882         }
883         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_PATHNAME__BFS, &dummy)))
884         {
885                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
886                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
887                         "please notify linux-acpi@vger.kernel.org\n");
888         }
889 }
890
891 int __init acpi_sleep_init(void)
892 {
893         acpi_status status;
894         u8 type_a, type_b;
895 #ifdef CONFIG_SUSPEND
896         int i = 0;
897 #endif
898
899         if (acpi_disabled)
900                 return 0;
901
902         acpi_sleep_dmi_check();
903
904         sleep_states[ACPI_STATE_S0] = 1;
905         printk(KERN_INFO PREFIX "(supports S0");
906
907 #ifdef CONFIG_SUSPEND
908         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
909                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
910                 if (ACPI_SUCCESS(status)) {
911                         sleep_states[i] = 1;
912                         printk(" S%d", i);
913                 }
914         }
915
916         suspend_set_ops(old_suspend_ordering ?
917                 &acpi_suspend_ops_old : &acpi_suspend_ops);
918 #endif
919
920 #ifdef CONFIG_HIBERNATION
921         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
922         if (ACPI_SUCCESS(status)) {
923                 hibernation_set_ops(old_suspend_ordering ?
924                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
925                 sleep_states[ACPI_STATE_S4] = 1;
926                 printk(" S4");
927                 if (!nosigcheck) {
928                         acpi_get_table(ACPI_SIG_FACS, 1,
929                                 (struct acpi_table_header **)&facs);
930                         if (facs)
931                                 s4_hardware_signature =
932                                         facs->hardware_signature;
933                 }
934         }
935 #endif
936         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
937         if (ACPI_SUCCESS(status)) {
938                 sleep_states[ACPI_STATE_S5] = 1;
939                 printk(" S5");
940                 pm_power_off_prepare = acpi_power_off_prepare;
941                 pm_power_off = acpi_power_off;
942         }
943         printk(")\n");
944         /*
945          * Register the tts_notifier to reboot notifier list so that the _TTS
946          * object can also be evaluated when the system enters S5.
947          */
948         register_reboot_notifier(&tts_notifier);
949         acpi_gts_bfs_check();
950         return 0;
951 }