Staging: epl: remove EPLDLLEXPORT
[linux-2.6] / 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
20 #include <asm/io.h>
21
22 #include <acpi/acpi_bus.h>
23 #include <acpi/acpi_drivers.h>
24 #include "sleep.h"
25
26 u8 sleep_states[ACPI_S_STATE_COUNT];
27
28 static void acpi_sleep_tts_switch(u32 acpi_state)
29 {
30         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
31         struct acpi_object_list arg_list = { 1, &in_arg };
32         acpi_status status = AE_OK;
33
34         in_arg.integer.value = acpi_state;
35         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
36         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
37                 /*
38                  * OS can't evaluate the _TTS object correctly. Some warning
39                  * message will be printed. But it won't break anything.
40                  */
41                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
42         }
43 }
44
45 static int tts_notify_reboot(struct notifier_block *this,
46                         unsigned long code, void *x)
47 {
48         acpi_sleep_tts_switch(ACPI_STATE_S5);
49         return NOTIFY_DONE;
50 }
51
52 static struct notifier_block tts_notifier = {
53         .notifier_call  = tts_notify_reboot,
54         .next           = NULL,
55         .priority       = 0,
56 };
57
58 static int acpi_sleep_prepare(u32 acpi_state)
59 {
60 #ifdef CONFIG_ACPI_SLEEP
61         /* do we have a wakeup address for S2 and S3? */
62         if (acpi_state == ACPI_STATE_S3) {
63                 if (!acpi_wakeup_address) {
64                         return -EFAULT;
65                 }
66                 acpi_set_firmware_waking_vector(
67                                 (acpi_physical_address)acpi_wakeup_address);
68
69         }
70         ACPI_FLUSH_CPU_CACHE();
71         acpi_enable_wakeup_device_prep(acpi_state);
72 #endif
73         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
74                 acpi_state);
75         acpi_enter_sleep_state_prep(acpi_state);
76         return 0;
77 }
78
79 #ifdef CONFIG_ACPI_SLEEP
80 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
81 /*
82  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
83  * user to request that behavior by using the 'acpi_old_suspend_ordering'
84  * kernel command line option that causes the following variable to be set.
85  */
86 static bool old_suspend_ordering;
87
88 void __init acpi_old_suspend_ordering(void)
89 {
90         old_suspend_ordering = true;
91 }
92
93 /**
94  *      acpi_pm_disable_gpes - Disable the GPEs.
95  */
96 static int acpi_pm_disable_gpes(void)
97 {
98         acpi_disable_all_gpes();
99         return 0;
100 }
101
102 /**
103  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
104  *
105  *      If necessary, set the firmware waking vector and do arch-specific
106  *      nastiness to get the wakeup code to the waking vector.
107  */
108 static int __acpi_pm_prepare(void)
109 {
110         int error = acpi_sleep_prepare(acpi_target_sleep_state);
111
112         if (error)
113                 acpi_target_sleep_state = ACPI_STATE_S0;
114         return error;
115 }
116
117 /**
118  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
119  *              state and disable the GPEs.
120  */
121 static int acpi_pm_prepare(void)
122 {
123         int error = __acpi_pm_prepare();
124
125         if (!error)
126                 acpi_disable_all_gpes();
127         return error;
128 }
129
130 /**
131  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
132  *
133  *      This is called after we wake back up (or if entering the sleep state
134  *      failed).
135  */
136 static void acpi_pm_finish(void)
137 {
138         u32 acpi_state = acpi_target_sleep_state;
139
140         if (acpi_state == ACPI_STATE_S0)
141                 return;
142
143         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
144                 acpi_state);
145         acpi_disable_wakeup_device(acpi_state);
146         acpi_leave_sleep_state(acpi_state);
147
148         /* reset firmware waking vector */
149         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
150
151         acpi_target_sleep_state = ACPI_STATE_S0;
152 }
153
154 /**
155  *      acpi_pm_end - Finish up suspend sequence.
156  */
157 static void acpi_pm_end(void)
158 {
159         /*
160          * This is necessary in case acpi_pm_finish() is not called during a
161          * failing transition to a sleep state.
162          */
163         acpi_target_sleep_state = ACPI_STATE_S0;
164         acpi_sleep_tts_switch(acpi_target_sleep_state);
165 }
166 #else /* !CONFIG_ACPI_SLEEP */
167 #define acpi_target_sleep_state ACPI_STATE_S0
168 #endif /* CONFIG_ACPI_SLEEP */
169
170 #ifdef CONFIG_SUSPEND
171 /*
172  * According to the ACPI specification the BIOS should make sure that ACPI is
173  * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states.  Still,
174  * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
175  * on such systems during resume.  Unfortunately that doesn't help in
176  * particularly pathological cases in which SCI_EN has to be set directly on
177  * resume, although the specification states very clearly that this flag is
178  * owned by the hardware.  The set_sci_en_on_resume variable will be set in such
179  * cases.
180  */
181 static bool set_sci_en_on_resume;
182
183 extern void do_suspend_lowlevel(void);
184
185 static u32 acpi_suspend_states[] = {
186         [PM_SUSPEND_ON] = ACPI_STATE_S0,
187         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
188         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
189         [PM_SUSPEND_MAX] = ACPI_STATE_S5
190 };
191
192 /**
193  *      acpi_suspend_begin - Set the target system sleep state to the state
194  *              associated with given @pm_state, if supported.
195  */
196 static int acpi_suspend_begin(suspend_state_t pm_state)
197 {
198         u32 acpi_state = acpi_suspend_states[pm_state];
199         int error = 0;
200
201         if (sleep_states[acpi_state]) {
202                 acpi_target_sleep_state = acpi_state;
203                 acpi_sleep_tts_switch(acpi_target_sleep_state);
204         } else {
205                 printk(KERN_ERR "ACPI does not support this state: %d\n",
206                         pm_state);
207                 error = -ENOSYS;
208         }
209         return error;
210 }
211
212 /**
213  *      acpi_suspend_enter - Actually enter a sleep state.
214  *      @pm_state: ignored
215  *
216  *      Flush caches and go to sleep. For STR we have to call arch-specific
217  *      assembly, which in turn call acpi_enter_sleep_state().
218  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
219  */
220 static int acpi_suspend_enter(suspend_state_t pm_state)
221 {
222         acpi_status status = AE_OK;
223         unsigned long flags = 0;
224         u32 acpi_state = acpi_target_sleep_state;
225
226         ACPI_FLUSH_CPU_CACHE();
227
228         /* Do arch specific saving of state. */
229         if (acpi_state == ACPI_STATE_S3) {
230                 int error = acpi_save_state_mem();
231
232                 if (error)
233                         return error;
234         }
235
236         local_irq_save(flags);
237         acpi_enable_wakeup_device(acpi_state);
238         switch (acpi_state) {
239         case ACPI_STATE_S1:
240                 barrier();
241                 status = acpi_enter_sleep_state(acpi_state);
242                 break;
243
244         case ACPI_STATE_S3:
245                 do_suspend_lowlevel();
246                 break;
247         }
248
249         /* If ACPI is not enabled by the BIOS, we need to enable it here. */
250         if (set_sci_en_on_resume)
251                 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
252         else
253                 acpi_enable();
254
255         /* Reprogram control registers and execute _BFS */
256         acpi_leave_sleep_state_prep(acpi_state);
257
258         /* ACPI 3.0 specs (P62) says that it's the responsibility
259          * of the OSPM to clear the status bit [ implying that the
260          * POWER_BUTTON event should not reach userspace ]
261          */
262         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
263                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
264
265         /*
266          * Disable and clear GPE status before interrupt is enabled. Some GPEs
267          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
268          * acpi_leave_sleep_state will reenable specific GPEs later
269          */
270         acpi_disable_all_gpes();
271
272         local_irq_restore(flags);
273         printk(KERN_DEBUG "Back to C!\n");
274
275         /* restore processor state */
276         if (acpi_state == ACPI_STATE_S3)
277                 acpi_restore_state_mem();
278
279         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
280 }
281
282 static int acpi_suspend_state_valid(suspend_state_t pm_state)
283 {
284         u32 acpi_state;
285
286         switch (pm_state) {
287         case PM_SUSPEND_ON:
288         case PM_SUSPEND_STANDBY:
289         case PM_SUSPEND_MEM:
290                 acpi_state = acpi_suspend_states[pm_state];
291
292                 return sleep_states[acpi_state];
293         default:
294                 return 0;
295         }
296 }
297
298 static struct platform_suspend_ops acpi_suspend_ops = {
299         .valid = acpi_suspend_state_valid,
300         .begin = acpi_suspend_begin,
301         .prepare = acpi_pm_prepare,
302         .enter = acpi_suspend_enter,
303         .finish = acpi_pm_finish,
304         .end = acpi_pm_end,
305 };
306
307 /**
308  *      acpi_suspend_begin_old - Set the target system sleep state to the
309  *              state associated with given @pm_state, if supported, and
310  *              execute the _PTS control method.  This function is used if the
311  *              pre-ACPI 2.0 suspend ordering has been requested.
312  */
313 static int acpi_suspend_begin_old(suspend_state_t pm_state)
314 {
315         int error = acpi_suspend_begin(pm_state);
316
317         if (!error)
318                 error = __acpi_pm_prepare();
319         return error;
320 }
321
322 /*
323  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
324  * been requested.
325  */
326 static struct platform_suspend_ops acpi_suspend_ops_old = {
327         .valid = acpi_suspend_state_valid,
328         .begin = acpi_suspend_begin_old,
329         .prepare = acpi_pm_disable_gpes,
330         .enter = acpi_suspend_enter,
331         .finish = acpi_pm_finish,
332         .end = acpi_pm_end,
333         .recover = acpi_pm_finish,
334 };
335
336 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
337 {
338         old_suspend_ordering = true;
339         return 0;
340 }
341
342 static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
343 {
344         set_sci_en_on_resume = true;
345         return 0;
346 }
347
348 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
349         {
350         .callback = init_old_suspend_ordering,
351         .ident = "Abit KN9 (nForce4 variant)",
352         .matches = {
353                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
354                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
355                 },
356         },
357         {
358         .callback = init_old_suspend_ordering,
359         .ident = "HP xw4600 Workstation",
360         .matches = {
361                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
362                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
363                 },
364         },
365         {
366         .callback = init_set_sci_en_on_resume,
367         .ident = "Apple MacBook 1,1",
368         .matches = {
369                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
370                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
371                 },
372         },
373         {
374         .callback = init_set_sci_en_on_resume,
375         .ident = "Apple MacMini 1,1",
376         .matches = {
377                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
378                 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
379                 },
380         },
381         {
382         .callback = init_old_suspend_ordering,
383         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
384         .matches = {
385                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
386                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
387                 },
388         },
389         {
390         .callback = init_set_sci_en_on_resume,
391         .ident = "Toshiba Satellite L300",
392         .matches = {
393                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
394                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"),
395                 },
396         },
397         {},
398 };
399 #endif /* CONFIG_SUSPEND */
400
401 #ifdef CONFIG_HIBERNATION
402 /*
403  * The ACPI specification wants us to save NVS memory regions during hibernation
404  * and to restore them during the subsequent resume.  However, it is not certain
405  * if this mechanism is going to work on all machines, so we allow the user to
406  * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
407  * option.
408  */
409 static bool s4_no_nvs;
410
411 void __init acpi_s4_no_nvs(void)
412 {
413         s4_no_nvs = true;
414 }
415
416 static unsigned long s4_hardware_signature;
417 static struct acpi_table_facs *facs;
418 static bool nosigcheck;
419
420 void __init acpi_no_s4_hw_signature(void)
421 {
422         nosigcheck = true;
423 }
424
425 static int acpi_hibernation_begin(void)
426 {
427         int error;
428
429         error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
430         if (!error) {
431                 acpi_target_sleep_state = ACPI_STATE_S4;
432                 acpi_sleep_tts_switch(acpi_target_sleep_state);
433         }
434
435         return error;
436 }
437
438 static int acpi_hibernation_pre_snapshot(void)
439 {
440         int error = acpi_pm_prepare();
441
442         if (!error)
443                 hibernate_nvs_save();
444
445         return error;
446 }
447
448 static int acpi_hibernation_enter(void)
449 {
450         acpi_status status = AE_OK;
451         unsigned long flags = 0;
452
453         ACPI_FLUSH_CPU_CACHE();
454
455         local_irq_save(flags);
456         acpi_enable_wakeup_device(ACPI_STATE_S4);
457         /* This shouldn't return.  If it returns, we have a problem */
458         status = acpi_enter_sleep_state(ACPI_STATE_S4);
459         /* Reprogram control registers and execute _BFS */
460         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
461         local_irq_restore(flags);
462
463         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
464 }
465
466 static void acpi_hibernation_finish(void)
467 {
468         hibernate_nvs_free();
469         acpi_pm_finish();
470 }
471
472 static void acpi_hibernation_leave(void)
473 {
474         /*
475          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
476          * enable it here.
477          */
478         acpi_enable();
479         /* Reprogram control registers and execute _BFS */
480         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
481         /* Check the hardware signature */
482         if (facs && s4_hardware_signature != facs->hardware_signature) {
483                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
484                         "cannot resume!\n");
485                 panic("ACPI S4 hardware signature mismatch");
486         }
487         /* Restore the NVS memory area */
488         hibernate_nvs_restore();
489 }
490
491 static void acpi_pm_enable_gpes(void)
492 {
493         acpi_enable_all_runtime_gpes();
494 }
495
496 static struct platform_hibernation_ops acpi_hibernation_ops = {
497         .begin = acpi_hibernation_begin,
498         .end = acpi_pm_end,
499         .pre_snapshot = acpi_hibernation_pre_snapshot,
500         .finish = acpi_hibernation_finish,
501         .prepare = acpi_pm_prepare,
502         .enter = acpi_hibernation_enter,
503         .leave = acpi_hibernation_leave,
504         .pre_restore = acpi_pm_disable_gpes,
505         .restore_cleanup = acpi_pm_enable_gpes,
506 };
507
508 /**
509  *      acpi_hibernation_begin_old - Set the target system sleep state to
510  *              ACPI_STATE_S4 and execute the _PTS control method.  This
511  *              function is used if the pre-ACPI 2.0 suspend ordering has been
512  *              requested.
513  */
514 static int acpi_hibernation_begin_old(void)
515 {
516         int error;
517         /*
518          * The _TTS object should always be evaluated before the _PTS object.
519          * When the old_suspended_ordering is true, the _PTS object is
520          * evaluated in the acpi_sleep_prepare.
521          */
522         acpi_sleep_tts_switch(ACPI_STATE_S4);
523
524         error = acpi_sleep_prepare(ACPI_STATE_S4);
525
526         if (!error) {
527                 if (!s4_no_nvs)
528                         error = hibernate_nvs_alloc();
529                 if (!error)
530                         acpi_target_sleep_state = ACPI_STATE_S4;
531         }
532         return error;
533 }
534
535 static int acpi_hibernation_pre_snapshot_old(void)
536 {
537         int error = acpi_pm_disable_gpes();
538
539         if (!error)
540                 hibernate_nvs_save();
541
542         return error;
543 }
544
545 /*
546  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
547  * been requested.
548  */
549 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
550         .begin = acpi_hibernation_begin_old,
551         .end = acpi_pm_end,
552         .pre_snapshot = acpi_hibernation_pre_snapshot_old,
553         .finish = acpi_hibernation_finish,
554         .prepare = acpi_pm_disable_gpes,
555         .enter = acpi_hibernation_enter,
556         .leave = acpi_hibernation_leave,
557         .pre_restore = acpi_pm_disable_gpes,
558         .restore_cleanup = acpi_pm_enable_gpes,
559         .recover = acpi_pm_finish,
560 };
561 #endif /* CONFIG_HIBERNATION */
562
563 int acpi_suspend(u32 acpi_state)
564 {
565         suspend_state_t states[] = {
566                 [1] = PM_SUSPEND_STANDBY,
567                 [3] = PM_SUSPEND_MEM,
568                 [5] = PM_SUSPEND_MAX
569         };
570
571         if (acpi_state < 6 && states[acpi_state])
572                 return pm_suspend(states[acpi_state]);
573         if (acpi_state == 4)
574                 return hibernate();
575         return -EINVAL;
576 }
577
578 #ifdef CONFIG_PM_SLEEP
579 /**
580  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
581  *              in the system sleep state given by %acpi_target_sleep_state
582  *      @dev: device to examine; its driver model wakeup flags control
583  *              whether it should be able to wake up the system
584  *      @d_min_p: used to store the upper limit of allowed states range
585  *      Return value: preferred power state of the device on success, -ENODEV on
586  *              failure (ie. if there's no 'struct acpi_device' for @dev)
587  *
588  *      Find the lowest power (highest number) ACPI device power state that
589  *      device @dev can be in while the system is in the sleep state represented
590  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
591  *      able to wake up the system from this sleep state.  If @d_min_p is set,
592  *      the highest power (lowest number) device power state of @dev allowed
593  *      in this system sleep state is stored at the location pointed to by it.
594  *
595  *      The caller must ensure that @dev is valid before using this function.
596  *      The caller is also responsible for figuring out if the device is
597  *      supposed to be able to wake up the system and passing this information
598  *      via @wake.
599  */
600
601 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
602 {
603         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
604         struct acpi_device *adev;
605         char acpi_method[] = "_SxD";
606         unsigned long long d_min, d_max;
607
608         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
609                 printk(KERN_DEBUG "ACPI handle has no context!\n");
610                 return -ENODEV;
611         }
612
613         acpi_method[2] = '0' + acpi_target_sleep_state;
614         /*
615          * If the sleep state is S0, we will return D3, but if the device has
616          * _S0W, we will use the value from _S0W
617          */
618         d_min = ACPI_STATE_D0;
619         d_max = ACPI_STATE_D3;
620
621         /*
622          * If present, _SxD methods return the minimum D-state (highest power
623          * state) we can use for the corresponding S-states.  Otherwise, the
624          * minimum D-state is D0 (ACPI 3.x).
625          *
626          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
627          * provided -- that's our fault recovery, we ignore retval.
628          */
629         if (acpi_target_sleep_state > ACPI_STATE_S0)
630                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
631
632         /*
633          * If _PRW says we can wake up the system from the target sleep state,
634          * the D-state returned by _SxD is sufficient for that (we assume a
635          * wakeup-aware driver if wake is set).  Still, if _SxW exists
636          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
637          * can wake the system.  _S0W may be valid, too.
638          */
639         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
640             (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
641              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
642                 acpi_status status;
643
644                 acpi_method[3] = 'W';
645                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
646                                                 &d_max);
647                 if (ACPI_FAILURE(status)) {
648                         d_max = d_min;
649                 } else if (d_max < d_min) {
650                         /* Warn the user of the broken DSDT */
651                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
652                                 acpi_method);
653                         /* Sanitize it */
654                         d_min = d_max;
655                 }
656         }
657
658         if (d_min_p)
659                 *d_min_p = d_min;
660         return d_max;
661 }
662
663 /**
664  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
665  *                                  capability of given device
666  *      @dev: device to handle
667  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
668  */
669 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
670 {
671         acpi_handle handle;
672         struct acpi_device *adev;
673
674         if (!device_may_wakeup(dev))
675                 return -EINVAL;
676
677         handle = DEVICE_ACPI_HANDLE(dev);
678         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
679                 printk(KERN_DEBUG "ACPI handle has no context!\n");
680                 return -ENODEV;
681         }
682
683         return enable ?
684                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
685                 acpi_disable_wakeup_device_power(adev);
686 }
687 #endif
688
689 static void acpi_power_off_prepare(void)
690 {
691         /* Prepare to power off the system */
692         acpi_sleep_prepare(ACPI_STATE_S5);
693         acpi_disable_all_gpes();
694 }
695
696 static void acpi_power_off(void)
697 {
698         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
699         printk(KERN_DEBUG "%s called\n", __func__);
700         local_irq_disable();
701         acpi_enable_wakeup_device(ACPI_STATE_S5);
702         acpi_enter_sleep_state(ACPI_STATE_S5);
703 }
704
705 int __init acpi_sleep_init(void)
706 {
707         acpi_status status;
708         u8 type_a, type_b;
709 #ifdef CONFIG_SUSPEND
710         int i = 0;
711
712         dmi_check_system(acpisleep_dmi_table);
713 #endif
714
715         if (acpi_disabled)
716                 return 0;
717
718         sleep_states[ACPI_STATE_S0] = 1;
719         printk(KERN_INFO PREFIX "(supports S0");
720
721 #ifdef CONFIG_SUSPEND
722         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
723                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
724                 if (ACPI_SUCCESS(status)) {
725                         sleep_states[i] = 1;
726                         printk(" S%d", i);
727                 }
728         }
729
730         suspend_set_ops(old_suspend_ordering ?
731                 &acpi_suspend_ops_old : &acpi_suspend_ops);
732 #endif
733
734 #ifdef CONFIG_HIBERNATION
735         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
736         if (ACPI_SUCCESS(status)) {
737                 hibernation_set_ops(old_suspend_ordering ?
738                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
739                 sleep_states[ACPI_STATE_S4] = 1;
740                 printk(" S4");
741                 if (!nosigcheck) {
742                         acpi_get_table(ACPI_SIG_FACS, 1,
743                                 (struct acpi_table_header **)&facs);
744                         if (facs)
745                                 s4_hardware_signature =
746                                         facs->hardware_signature;
747                 }
748         }
749 #endif
750         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
751         if (ACPI_SUCCESS(status)) {
752                 sleep_states[ACPI_STATE_S5] = 1;
753                 printk(" S5");
754                 pm_power_off_prepare = acpi_power_off_prepare;
755                 pm_power_off = acpi_power_off;
756         }
757         printk(")\n");
758         /*
759          * Register the tts_notifier to reboot notifier list so that the _TTS
760          * object can also be evaluated when the system enters S5.
761          */
762         register_reboot_notifier(&tts_notifier);
763         return 0;
764 }