Staging: comedi: Remove boardtype typedef in addi-data
[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
25 #include "internal.h"
26 #include "sleep.h"
27
28 u8 sleep_states[ACPI_S_STATE_COUNT];
29
30 static void acpi_sleep_tts_switch(u32 acpi_state)
31 {
32         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
33         struct acpi_object_list arg_list = { 1, &in_arg };
34         acpi_status status = AE_OK;
35
36         in_arg.integer.value = acpi_state;
37         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
38         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
39                 /*
40                  * OS can't evaluate the _TTS object correctly. Some warning
41                  * message will be printed. But it won't break anything.
42                  */
43                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
44         }
45 }
46
47 static int tts_notify_reboot(struct notifier_block *this,
48                         unsigned long code, void *x)
49 {
50         acpi_sleep_tts_switch(ACPI_STATE_S5);
51         return NOTIFY_DONE;
52 }
53
54 static struct notifier_block tts_notifier = {
55         .notifier_call  = tts_notify_reboot,
56         .next           = NULL,
57         .priority       = 0,
58 };
59
60 static int acpi_sleep_prepare(u32 acpi_state)
61 {
62 #ifdef CONFIG_ACPI_SLEEP
63         /* do we have a wakeup address for S2 and S3? */
64         if (acpi_state == ACPI_STATE_S3) {
65                 if (!acpi_wakeup_address) {
66                         return -EFAULT;
67                 }
68                 acpi_set_firmware_waking_vector(
69                                 (acpi_physical_address)acpi_wakeup_address);
70
71         }
72         ACPI_FLUSH_CPU_CACHE();
73         acpi_enable_wakeup_device_prep(acpi_state);
74 #endif
75         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
76                 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  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
85  * user to request that behavior by using the 'acpi_old_suspend_ordering'
86  * kernel command line option that causes the following variable to be set.
87  */
88 static bool old_suspend_ordering;
89
90 void __init acpi_old_suspend_ordering(void)
91 {
92         old_suspend_ordering = true;
93 }
94
95 /**
96  *      acpi_pm_disable_gpes - Disable the GPEs.
97  */
98 static int acpi_pm_disable_gpes(void)
99 {
100         acpi_disable_all_gpes();
101         return 0;
102 }
103
104 /**
105  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
106  *
107  *      If necessary, set the firmware waking vector and do arch-specific
108  *      nastiness to get the wakeup code to the waking vector.
109  */
110 static int __acpi_pm_prepare(void)
111 {
112         int error = acpi_sleep_prepare(acpi_target_sleep_state);
113
114         if (error)
115                 acpi_target_sleep_state = ACPI_STATE_S0;
116         return error;
117 }
118
119 /**
120  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
121  *              state and disable the GPEs.
122  */
123 static int acpi_pm_prepare(void)
124 {
125         int error = __acpi_pm_prepare();
126
127         if (!error)
128                 acpi_disable_all_gpes();
129         return error;
130 }
131
132 /**
133  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
134  *
135  *      This is called after we wake back up (or if entering the sleep state
136  *      failed).
137  */
138 static void acpi_pm_finish(void)
139 {
140         u32 acpi_state = acpi_target_sleep_state;
141
142         if (acpi_state == ACPI_STATE_S0)
143                 return;
144
145         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
146                 acpi_state);
147         acpi_disable_wakeup_device(acpi_state);
148         acpi_leave_sleep_state(acpi_state);
149
150         /* reset firmware waking vector */
151         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
152
153         acpi_target_sleep_state = ACPI_STATE_S0;
154 }
155
156 /**
157  *      acpi_pm_end - Finish up suspend sequence.
158  */
159 static void acpi_pm_end(void)
160 {
161         /*
162          * This is necessary in case acpi_pm_finish() is not called during a
163          * failing transition to a sleep state.
164          */
165         acpi_target_sleep_state = ACPI_STATE_S0;
166         acpi_sleep_tts_switch(acpi_target_sleep_state);
167 }
168 #else /* !CONFIG_ACPI_SLEEP */
169 #define acpi_target_sleep_state ACPI_STATE_S0
170 #endif /* CONFIG_ACPI_SLEEP */
171
172 #ifdef CONFIG_SUSPEND
173 /*
174  * According to the ACPI specification the BIOS should make sure that ACPI is
175  * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states.  Still,
176  * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
177  * on such systems during resume.  Unfortunately that doesn't help in
178  * particularly pathological cases in which SCI_EN has to be set directly on
179  * resume, although the specification states very clearly that this flag is
180  * owned by the hardware.  The set_sci_en_on_resume variable will be set in such
181  * cases.
182  */
183 static bool set_sci_en_on_resume;
184
185 extern void do_suspend_lowlevel(void);
186
187 static u32 acpi_suspend_states[] = {
188         [PM_SUSPEND_ON] = ACPI_STATE_S0,
189         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
190         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
191         [PM_SUSPEND_MAX] = ACPI_STATE_S5
192 };
193
194 /**
195  *      acpi_suspend_begin - Set the target system sleep state to the state
196  *              associated with given @pm_state, if supported.
197  */
198 static int acpi_suspend_begin(suspend_state_t pm_state)
199 {
200         u32 acpi_state = acpi_suspend_states[pm_state];
201         int error = 0;
202
203         if (sleep_states[acpi_state]) {
204                 acpi_target_sleep_state = acpi_state;
205                 acpi_sleep_tts_switch(acpi_target_sleep_state);
206         } else {
207                 printk(KERN_ERR "ACPI does not support this state: %d\n",
208                         pm_state);
209                 error = -ENOSYS;
210         }
211         return error;
212 }
213
214 /**
215  *      acpi_suspend_enter - Actually enter a sleep state.
216  *      @pm_state: ignored
217  *
218  *      Flush caches and go to sleep. For STR we have to call arch-specific
219  *      assembly, which in turn call acpi_enter_sleep_state().
220  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
221  */
222 static int acpi_suspend_enter(suspend_state_t pm_state)
223 {
224         acpi_status status = AE_OK;
225         unsigned long flags = 0;
226         u32 acpi_state = acpi_target_sleep_state;
227
228         ACPI_FLUSH_CPU_CACHE();
229
230         /* Do arch specific saving of state. */
231         if (acpi_state == ACPI_STATE_S3) {
232                 int error = acpi_save_state_mem();
233
234                 if (error)
235                         return error;
236         }
237
238         local_irq_save(flags);
239         acpi_enable_wakeup_device(acpi_state);
240         switch (acpi_state) {
241         case ACPI_STATE_S1:
242                 barrier();
243                 status = acpi_enter_sleep_state(acpi_state);
244                 break;
245
246         case ACPI_STATE_S3:
247                 do_suspend_lowlevel();
248                 break;
249         }
250
251         /* If ACPI is not enabled by the BIOS, we need to enable it here. */
252         if (set_sci_en_on_resume)
253                 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
254         else
255                 acpi_enable();
256
257         /* Reprogram control registers and execute _BFS */
258         acpi_leave_sleep_state_prep(acpi_state);
259
260         /* ACPI 3.0 specs (P62) says that it's the responsibility
261          * of the OSPM to clear the status bit [ implying that the
262          * POWER_BUTTON event should not reach userspace ]
263          */
264         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
265                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
266
267         /*
268          * Disable and clear GPE status before interrupt is enabled. Some GPEs
269          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
270          * acpi_leave_sleep_state will reenable specific GPEs later
271          */
272         acpi_disable_all_gpes();
273
274         local_irq_restore(flags);
275         printk(KERN_DEBUG "Back to C!\n");
276
277         /* restore processor state */
278         if (acpi_state == ACPI_STATE_S3)
279                 acpi_restore_state_mem();
280
281         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
282 }
283
284 static int acpi_suspend_state_valid(suspend_state_t pm_state)
285 {
286         u32 acpi_state;
287
288         switch (pm_state) {
289         case PM_SUSPEND_ON:
290         case PM_SUSPEND_STANDBY:
291         case PM_SUSPEND_MEM:
292                 acpi_state = acpi_suspend_states[pm_state];
293
294                 return sleep_states[acpi_state];
295         default:
296                 return 0;
297         }
298 }
299
300 static struct platform_suspend_ops acpi_suspend_ops = {
301         .valid = acpi_suspend_state_valid,
302         .begin = acpi_suspend_begin,
303         .prepare_late = acpi_pm_prepare,
304         .enter = acpi_suspend_enter,
305         .wake = acpi_pm_finish,
306         .end = acpi_pm_end,
307 };
308
309 /**
310  *      acpi_suspend_begin_old - Set the target system sleep state to the
311  *              state associated with given @pm_state, if supported, and
312  *              execute the _PTS control method.  This function is used if the
313  *              pre-ACPI 2.0 suspend ordering has been requested.
314  */
315 static int acpi_suspend_begin_old(suspend_state_t pm_state)
316 {
317         int error = acpi_suspend_begin(pm_state);
318
319         if (!error)
320                 error = __acpi_pm_prepare();
321         return error;
322 }
323
324 /*
325  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
326  * been requested.
327  */
328 static struct platform_suspend_ops acpi_suspend_ops_old = {
329         .valid = acpi_suspend_state_valid,
330         .begin = acpi_suspend_begin_old,
331         .prepare_late = acpi_pm_disable_gpes,
332         .enter = acpi_suspend_enter,
333         .wake = acpi_pm_finish,
334         .end = acpi_pm_end,
335         .recover = acpi_pm_finish,
336 };
337
338 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
339 {
340         old_suspend_ordering = true;
341         return 0;
342 }
343
344 static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
345 {
346         set_sci_en_on_resume = true;
347         return 0;
348 }
349
350 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
351         {
352         .callback = init_old_suspend_ordering,
353         .ident = "Abit KN9 (nForce4 variant)",
354         .matches = {
355                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
356                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
357                 },
358         },
359         {
360         .callback = init_old_suspend_ordering,
361         .ident = "HP xw4600 Workstation",
362         .matches = {
363                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
364                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
365                 },
366         },
367         {
368         .callback = init_set_sci_en_on_resume,
369         .ident = "Apple MacBook 1,1",
370         .matches = {
371                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
372                 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
373                 },
374         },
375         {
376         .callback = init_set_sci_en_on_resume,
377         .ident = "Apple MacMini 1,1",
378         .matches = {
379                 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
380                 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
381                 },
382         },
383         {
384         .callback = init_old_suspend_ordering,
385         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
386         .matches = {
387                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
388                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
389                 },
390         },
391         {
392         .callback = init_set_sci_en_on_resume,
393         .ident = "Toshiba Satellite L300",
394         .matches = {
395                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
396                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"),
397                 },
398         },
399         {
400         .callback = init_old_suspend_ordering,
401         .ident = "Panasonic CF51-2L",
402         .matches = {
403                 DMI_MATCH(DMI_BOARD_VENDOR,
404                                 "Matsushita Electric Industrial Co.,Ltd."),
405                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
406                 },
407         },
408         {},
409 };
410 #endif /* CONFIG_SUSPEND */
411
412 #ifdef CONFIG_HIBERNATION
413 /*
414  * The ACPI specification wants us to save NVS memory regions during hibernation
415  * and to restore them during the subsequent resume.  However, it is not certain
416  * if this mechanism is going to work on all machines, so we allow the user to
417  * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
418  * option.
419  */
420 static bool s4_no_nvs;
421
422 void __init acpi_s4_no_nvs(void)
423 {
424         s4_no_nvs = true;
425 }
426
427 static unsigned long s4_hardware_signature;
428 static struct acpi_table_facs *facs;
429 static bool nosigcheck;
430
431 void __init acpi_no_s4_hw_signature(void)
432 {
433         nosigcheck = true;
434 }
435
436 static int acpi_hibernation_begin(void)
437 {
438         int error;
439
440         error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
441         if (!error) {
442                 acpi_target_sleep_state = ACPI_STATE_S4;
443                 acpi_sleep_tts_switch(acpi_target_sleep_state);
444         }
445
446         return error;
447 }
448
449 static int acpi_hibernation_pre_snapshot(void)
450 {
451         int error = acpi_pm_prepare();
452
453         if (!error)
454                 hibernate_nvs_save();
455
456         return error;
457 }
458
459 static int acpi_hibernation_enter(void)
460 {
461         acpi_status status = AE_OK;
462         unsigned long flags = 0;
463
464         ACPI_FLUSH_CPU_CACHE();
465
466         local_irq_save(flags);
467         acpi_enable_wakeup_device(ACPI_STATE_S4);
468         /* This shouldn't return.  If it returns, we have a problem */
469         status = acpi_enter_sleep_state(ACPI_STATE_S4);
470         /* Reprogram control registers and execute _BFS */
471         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
472         local_irq_restore(flags);
473
474         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
475 }
476
477 static void acpi_hibernation_finish(void)
478 {
479         hibernate_nvs_free();
480         acpi_pm_finish();
481 }
482
483 static void acpi_hibernation_leave(void)
484 {
485         /*
486          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
487          * enable it here.
488          */
489         acpi_enable();
490         /* Reprogram control registers and execute _BFS */
491         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
492         /* Check the hardware signature */
493         if (facs && s4_hardware_signature != facs->hardware_signature) {
494                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
495                         "cannot resume!\n");
496                 panic("ACPI S4 hardware signature mismatch");
497         }
498         /* Restore the NVS memory area */
499         hibernate_nvs_restore();
500 }
501
502 static void acpi_pm_enable_gpes(void)
503 {
504         acpi_enable_all_runtime_gpes();
505 }
506
507 static struct platform_hibernation_ops acpi_hibernation_ops = {
508         .begin = acpi_hibernation_begin,
509         .end = acpi_pm_end,
510         .pre_snapshot = acpi_hibernation_pre_snapshot,
511         .finish = acpi_hibernation_finish,
512         .prepare = acpi_pm_prepare,
513         .enter = acpi_hibernation_enter,
514         .leave = acpi_hibernation_leave,
515         .pre_restore = acpi_pm_disable_gpes,
516         .restore_cleanup = acpi_pm_enable_gpes,
517 };
518
519 /**
520  *      acpi_hibernation_begin_old - Set the target system sleep state to
521  *              ACPI_STATE_S4 and execute the _PTS control method.  This
522  *              function is used if the pre-ACPI 2.0 suspend ordering has been
523  *              requested.
524  */
525 static int acpi_hibernation_begin_old(void)
526 {
527         int error;
528         /*
529          * The _TTS object should always be evaluated before the _PTS object.
530          * When the old_suspended_ordering is true, the _PTS object is
531          * evaluated in the acpi_sleep_prepare.
532          */
533         acpi_sleep_tts_switch(ACPI_STATE_S4);
534
535         error = acpi_sleep_prepare(ACPI_STATE_S4);
536
537         if (!error) {
538                 if (!s4_no_nvs)
539                         error = hibernate_nvs_alloc();
540                 if (!error)
541                         acpi_target_sleep_state = ACPI_STATE_S4;
542         }
543         return error;
544 }
545
546 static int acpi_hibernation_pre_snapshot_old(void)
547 {
548         int error = acpi_pm_disable_gpes();
549
550         if (!error)
551                 hibernate_nvs_save();
552
553         return error;
554 }
555
556 /*
557  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
558  * been requested.
559  */
560 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
561         .begin = acpi_hibernation_begin_old,
562         .end = acpi_pm_end,
563         .pre_snapshot = acpi_hibernation_pre_snapshot_old,
564         .finish = acpi_hibernation_finish,
565         .prepare = acpi_pm_disable_gpes,
566         .enter = acpi_hibernation_enter,
567         .leave = acpi_hibernation_leave,
568         .pre_restore = acpi_pm_disable_gpes,
569         .restore_cleanup = acpi_pm_enable_gpes,
570         .recover = acpi_pm_finish,
571 };
572 #endif /* CONFIG_HIBERNATION */
573
574 int acpi_suspend(u32 acpi_state)
575 {
576         suspend_state_t states[] = {
577                 [1] = PM_SUSPEND_STANDBY,
578                 [3] = PM_SUSPEND_MEM,
579                 [5] = PM_SUSPEND_MAX
580         };
581
582         if (acpi_state < 6 && states[acpi_state])
583                 return pm_suspend(states[acpi_state]);
584         if (acpi_state == 4)
585                 return hibernate();
586         return -EINVAL;
587 }
588
589 #ifdef CONFIG_PM_SLEEP
590 /**
591  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
592  *              in the system sleep state given by %acpi_target_sleep_state
593  *      @dev: device to examine; its driver model wakeup flags control
594  *              whether it should be able to wake up the system
595  *      @d_min_p: used to store the upper limit of allowed states range
596  *      Return value: preferred power state of the device on success, -ENODEV on
597  *              failure (ie. if there's no 'struct acpi_device' for @dev)
598  *
599  *      Find the lowest power (highest number) ACPI device power state that
600  *      device @dev can be in while the system is in the sleep state represented
601  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
602  *      able to wake up the system from this sleep state.  If @d_min_p is set,
603  *      the highest power (lowest number) device power state of @dev allowed
604  *      in this system sleep state is stored at the location pointed to by it.
605  *
606  *      The caller must ensure that @dev is valid before using this function.
607  *      The caller is also responsible for figuring out if the device is
608  *      supposed to be able to wake up the system and passing this information
609  *      via @wake.
610  */
611
612 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
613 {
614         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
615         struct acpi_device *adev;
616         char acpi_method[] = "_SxD";
617         unsigned long long d_min, d_max;
618
619         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
620                 printk(KERN_DEBUG "ACPI handle has no context!\n");
621                 return -ENODEV;
622         }
623
624         acpi_method[2] = '0' + acpi_target_sleep_state;
625         /*
626          * If the sleep state is S0, we will return D3, but if the device has
627          * _S0W, we will use the value from _S0W
628          */
629         d_min = ACPI_STATE_D0;
630         d_max = ACPI_STATE_D3;
631
632         /*
633          * If present, _SxD methods return the minimum D-state (highest power
634          * state) we can use for the corresponding S-states.  Otherwise, the
635          * minimum D-state is D0 (ACPI 3.x).
636          *
637          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
638          * provided -- that's our fault recovery, we ignore retval.
639          */
640         if (acpi_target_sleep_state > ACPI_STATE_S0)
641                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
642
643         /*
644          * If _PRW says we can wake up the system from the target sleep state,
645          * the D-state returned by _SxD is sufficient for that (we assume a
646          * wakeup-aware driver if wake is set).  Still, if _SxW exists
647          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
648          * can wake the system.  _S0W may be valid, too.
649          */
650         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
651             (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
652              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
653                 acpi_status status;
654
655                 acpi_method[3] = 'W';
656                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
657                                                 &d_max);
658                 if (ACPI_FAILURE(status)) {
659                         d_max = d_min;
660                 } else if (d_max < d_min) {
661                         /* Warn the user of the broken DSDT */
662                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
663                                 acpi_method);
664                         /* Sanitize it */
665                         d_min = d_max;
666                 }
667         }
668
669         if (d_min_p)
670                 *d_min_p = d_min;
671         return d_max;
672 }
673
674 /**
675  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
676  *                                  capability of given device
677  *      @dev: device to handle
678  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
679  */
680 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
681 {
682         acpi_handle handle;
683         struct acpi_device *adev;
684
685         if (!device_may_wakeup(dev))
686                 return -EINVAL;
687
688         handle = DEVICE_ACPI_HANDLE(dev);
689         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
690                 printk(KERN_DEBUG "ACPI handle has no context!\n");
691                 return -ENODEV;
692         }
693
694         return enable ?
695                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
696                 acpi_disable_wakeup_device_power(adev);
697 }
698 #endif
699
700 static void acpi_power_off_prepare(void)
701 {
702         /* Prepare to power off the system */
703         acpi_sleep_prepare(ACPI_STATE_S5);
704         acpi_disable_all_gpes();
705 }
706
707 static void acpi_power_off(void)
708 {
709         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
710         printk(KERN_DEBUG "%s called\n", __func__);
711         local_irq_disable();
712         acpi_enable_wakeup_device(ACPI_STATE_S5);
713         acpi_enter_sleep_state(ACPI_STATE_S5);
714 }
715
716 /*
717  * ACPI 2.0 created the optional _GTS and _BFS,
718  * but industry adoption has been neither rapid nor broad.
719  *
720  * Linux gets into trouble when it executes poorly validated
721  * paths through the BIOS, so disable _GTS and _BFS by default,
722  * but do speak up and offer the option to enable them.
723  */
724 void __init acpi_gts_bfs_check(void)
725 {
726         acpi_handle dummy;
727
728         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
729         {
730                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
731                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
732                         "please notify linux-acpi@vger.kernel.org\n");
733         }
734         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
735         {
736                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
737                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
738                         "please notify linux-acpi@vger.kernel.org\n");
739         }
740 }
741
742 int __init acpi_sleep_init(void)
743 {
744         acpi_status status;
745         u8 type_a, type_b;
746 #ifdef CONFIG_SUSPEND
747         int i = 0;
748
749         dmi_check_system(acpisleep_dmi_table);
750 #endif
751
752         if (acpi_disabled)
753                 return 0;
754
755         sleep_states[ACPI_STATE_S0] = 1;
756         printk(KERN_INFO PREFIX "(supports S0");
757
758 #ifdef CONFIG_SUSPEND
759         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
760                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
761                 if (ACPI_SUCCESS(status)) {
762                         sleep_states[i] = 1;
763                         printk(" S%d", i);
764                 }
765         }
766
767         suspend_set_ops(old_suspend_ordering ?
768                 &acpi_suspend_ops_old : &acpi_suspend_ops);
769 #endif
770
771 #ifdef CONFIG_HIBERNATION
772         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
773         if (ACPI_SUCCESS(status)) {
774                 hibernation_set_ops(old_suspend_ordering ?
775                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
776                 sleep_states[ACPI_STATE_S4] = 1;
777                 printk(" S4");
778                 if (!nosigcheck) {
779                         acpi_get_table(ACPI_SIG_FACS, 1,
780                                 (struct acpi_table_header **)&facs);
781                         if (facs)
782                                 s4_hardware_signature =
783                                         facs->hardware_signature;
784                 }
785         }
786 #endif
787         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
788         if (ACPI_SUCCESS(status)) {
789                 sleep_states[ACPI_STATE_S5] = 1;
790                 printk(" S5");
791                 pm_power_off_prepare = acpi_power_off_prepare;
792                 pm_power_off = acpi_power_off;
793         }
794         printk(")\n");
795         /*
796          * Register the tts_notifier to reboot notifier list so that the _TTS
797          * object can also be evaluated when the system enters S5.
798          */
799         register_reboot_notifier(&tts_notifier);
800         acpi_gts_bfs_check();
801         return 0;
802 }