Merge branch 'suspend-ioremap-cache' into release
[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
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 static 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 #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 /*
85  * The ACPI specification wants us to save NVS memory regions during hibernation
86  * and to restore them during the subsequent resume.  Windows does that also for
87  * suspend to RAM.  However, it is known that this mechanism does not work on
88  * all machines, so we allow the user to disable it with the help of the
89  * 'acpi_sleep=nonvs' kernel command line option.
90  */
91 static bool nvs_nosave;
92
93 void __init acpi_nvs_nosave(void)
94 {
95         nvs_nosave = true;
96 }
97
98 /*
99  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
100  * user to request that behavior by using the 'acpi_old_suspend_ordering'
101  * kernel command line option that causes the following variable to be set.
102  */
103 static bool old_suspend_ordering;
104
105 void __init acpi_old_suspend_ordering(void)
106 {
107         old_suspend_ordering = true;
108 }
109
110 /**
111  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
112  */
113 static int acpi_pm_freeze(void)
114 {
115         acpi_disable_all_gpes();
116         acpi_os_wait_events_complete(NULL);
117         acpi_ec_block_transactions();
118         return 0;
119 }
120
121 /**
122  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
123  */
124 static int acpi_pm_pre_suspend(void)
125 {
126         acpi_pm_freeze();
127         return suspend_nvs_save();
128 }
129
130 /**
131  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
132  *
133  *      If necessary, set the firmware waking vector and do arch-specific
134  *      nastiness to get the wakeup code to the waking vector.
135  */
136 static int __acpi_pm_prepare(void)
137 {
138         int error = acpi_sleep_prepare(acpi_target_sleep_state);
139         if (error)
140                 acpi_target_sleep_state = ACPI_STATE_S0;
141
142         return error;
143 }
144
145 /**
146  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
147  *              state and disable the GPEs.
148  */
149 static int acpi_pm_prepare(void)
150 {
151         int error = __acpi_pm_prepare();
152         if (!error)
153                 error = acpi_pm_pre_suspend();
154
155         return error;
156 }
157
158 /**
159  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
160  *
161  *      This is called after we wake back up (or if entering the sleep state
162  *      failed).
163  */
164 static void acpi_pm_finish(void)
165 {
166         u32 acpi_state = acpi_target_sleep_state;
167
168         acpi_ec_unblock_transactions();
169
170         if (acpi_state == ACPI_STATE_S0)
171                 return;
172
173         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
174                 acpi_state);
175         acpi_disable_wakeup_devices(acpi_state);
176         acpi_leave_sleep_state(acpi_state);
177
178         /* reset firmware waking vector */
179         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
180
181         acpi_target_sleep_state = ACPI_STATE_S0;
182 }
183
184 /**
185  *      acpi_pm_end - Finish up suspend sequence.
186  */
187 static void acpi_pm_end(void)
188 {
189         suspend_nvs_free();
190         /*
191          * This is necessary in case acpi_pm_finish() is not called during a
192          * failing transition to a sleep state.
193          */
194         acpi_target_sleep_state = ACPI_STATE_S0;
195         acpi_sleep_tts_switch(acpi_target_sleep_state);
196 }
197 #else /* !CONFIG_ACPI_SLEEP */
198 #define acpi_target_sleep_state ACPI_STATE_S0
199 #endif /* CONFIG_ACPI_SLEEP */
200
201 #ifdef CONFIG_SUSPEND
202 extern void do_suspend_lowlevel(void);
203
204 static u32 acpi_suspend_states[] = {
205         [PM_SUSPEND_ON] = ACPI_STATE_S0,
206         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
207         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
208         [PM_SUSPEND_MAX] = ACPI_STATE_S5
209 };
210
211 /**
212  *      acpi_suspend_begin - Set the target system sleep state to the state
213  *              associated with given @pm_state, if supported.
214  */
215 static int acpi_suspend_begin(suspend_state_t pm_state)
216 {
217         u32 acpi_state = acpi_suspend_states[pm_state];
218         int error = 0;
219
220         error = nvs_nosave ? 0 : suspend_nvs_alloc();
221         if (error)
222                 return error;
223
224         if (sleep_states[acpi_state]) {
225                 acpi_target_sleep_state = acpi_state;
226                 acpi_sleep_tts_switch(acpi_target_sleep_state);
227         } else {
228                 printk(KERN_ERR "ACPI does not support this state: %d\n",
229                         pm_state);
230                 error = -ENOSYS;
231         }
232         return error;
233 }
234
235 /**
236  *      acpi_suspend_enter - Actually enter a sleep state.
237  *      @pm_state: ignored
238  *
239  *      Flush caches and go to sleep. For STR we have to call arch-specific
240  *      assembly, which in turn call acpi_enter_sleep_state().
241  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
242  */
243 static int acpi_suspend_enter(suspend_state_t pm_state)
244 {
245         acpi_status status = AE_OK;
246         unsigned long flags = 0;
247         u32 acpi_state = acpi_target_sleep_state;
248
249         ACPI_FLUSH_CPU_CACHE();
250
251         /* Do arch specific saving of state. */
252         if (acpi_state == ACPI_STATE_S3) {
253                 int error = acpi_save_state_mem();
254
255                 if (error)
256                         return error;
257         }
258
259         local_irq_save(flags);
260         switch (acpi_state) {
261         case ACPI_STATE_S1:
262                 barrier();
263                 status = acpi_enter_sleep_state(acpi_state);
264                 break;
265
266         case ACPI_STATE_S3:
267                 do_suspend_lowlevel();
268                 break;
269         }
270
271         /* This violates the spec but is required for bug compatibility. */
272         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
273
274         /* Reprogram control registers and execute _BFS */
275         acpi_leave_sleep_state_prep(acpi_state);
276
277         /* ACPI 3.0 specs (P62) says that it's the responsibility
278          * of the OSPM to clear the status bit [ implying that the
279          * POWER_BUTTON event should not reach userspace ]
280          */
281         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
282                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
283
284         /*
285          * Disable and clear GPE status before interrupt is enabled. Some GPEs
286          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
287          * acpi_leave_sleep_state will reenable specific GPEs later
288          */
289         acpi_disable_all_gpes();
290         /* Allow EC transactions to happen. */
291         acpi_ec_unblock_transactions_early();
292
293         local_irq_restore(flags);
294         printk(KERN_DEBUG "Back to C!\n");
295
296         /* restore processor state */
297         if (acpi_state == ACPI_STATE_S3)
298                 acpi_restore_state_mem();
299
300         suspend_nvs_restore();
301
302         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
303 }
304
305 static int acpi_suspend_state_valid(suspend_state_t pm_state)
306 {
307         u32 acpi_state;
308
309         switch (pm_state) {
310         case PM_SUSPEND_ON:
311         case PM_SUSPEND_STANDBY:
312         case PM_SUSPEND_MEM:
313                 acpi_state = acpi_suspend_states[pm_state];
314
315                 return sleep_states[acpi_state];
316         default:
317                 return 0;
318         }
319 }
320
321 static struct platform_suspend_ops acpi_suspend_ops = {
322         .valid = acpi_suspend_state_valid,
323         .begin = acpi_suspend_begin,
324         .prepare_late = acpi_pm_prepare,
325         .enter = acpi_suspend_enter,
326         .wake = acpi_pm_finish,
327         .end = acpi_pm_end,
328 };
329
330 /**
331  *      acpi_suspend_begin_old - Set the target system sleep state to the
332  *              state associated with given @pm_state, if supported, and
333  *              execute the _PTS control method.  This function is used if the
334  *              pre-ACPI 2.0 suspend ordering has been requested.
335  */
336 static int acpi_suspend_begin_old(suspend_state_t pm_state)
337 {
338         int error = acpi_suspend_begin(pm_state);
339         if (!error)
340                 error = __acpi_pm_prepare();
341
342         return error;
343 }
344
345 /*
346  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
347  * been requested.
348  */
349 static struct platform_suspend_ops acpi_suspend_ops_old = {
350         .valid = acpi_suspend_state_valid,
351         .begin = acpi_suspend_begin_old,
352         .prepare_late = acpi_pm_pre_suspend,
353         .enter = acpi_suspend_enter,
354         .wake = acpi_pm_finish,
355         .end = acpi_pm_end,
356         .recover = acpi_pm_finish,
357 };
358
359 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
360 {
361         old_suspend_ordering = true;
362         return 0;
363 }
364
365 static int __init init_nvs_nosave(const struct dmi_system_id *d)
366 {
367         acpi_nvs_nosave();
368         return 0;
369 }
370
371 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
372         {
373         .callback = init_old_suspend_ordering,
374         .ident = "Abit KN9 (nForce4 variant)",
375         .matches = {
376                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
377                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
378                 },
379         },
380         {
381         .callback = init_old_suspend_ordering,
382         .ident = "HP xw4600 Workstation",
383         .matches = {
384                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
385                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
386                 },
387         },
388         {
389         .callback = init_old_suspend_ordering,
390         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
391         .matches = {
392                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
393                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
394                 },
395         },
396         {
397         .callback = init_old_suspend_ordering,
398         .ident = "Panasonic CF51-2L",
399         .matches = {
400                 DMI_MATCH(DMI_BOARD_VENDOR,
401                                 "Matsushita Electric Industrial Co.,Ltd."),
402                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
403                 },
404         },
405         {
406         .callback = init_nvs_nosave,
407         .ident = "Sony Vaio VGN-SR11M",
408         .matches = {
409                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
410                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
411                 },
412         },
413         {
414         .callback = init_nvs_nosave,
415         .ident = "Everex StepNote Series",
416         .matches = {
417                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
418                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
419                 },
420         },
421         {
422         .callback = init_nvs_nosave,
423         .ident = "Sony Vaio VPCEB1Z1E",
424         .matches = {
425                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
426                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
427                 },
428         },
429         {
430         .callback = init_nvs_nosave,
431         .ident = "Sony Vaio VGN-NW130D",
432         .matches = {
433                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
434                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
435                 },
436         },
437         {
438         .callback = init_nvs_nosave,
439         .ident = "Averatec AV1020-ED2",
440         .matches = {
441                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
442                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
443                 },
444         },
445         {},
446 };
447 #endif /* CONFIG_SUSPEND */
448
449 #ifdef CONFIG_HIBERNATION
450 static unsigned long s4_hardware_signature;
451 static struct acpi_table_facs *facs;
452 static bool nosigcheck;
453
454 void __init acpi_no_s4_hw_signature(void)
455 {
456         nosigcheck = true;
457 }
458
459 static int acpi_hibernation_begin(void)
460 {
461         int error;
462
463         error = nvs_nosave ? 0 : suspend_nvs_alloc();
464         if (!error) {
465                 acpi_target_sleep_state = ACPI_STATE_S4;
466                 acpi_sleep_tts_switch(acpi_target_sleep_state);
467         }
468
469         return error;
470 }
471
472 static int acpi_hibernation_enter(void)
473 {
474         acpi_status status = AE_OK;
475         unsigned long flags = 0;
476
477         ACPI_FLUSH_CPU_CACHE();
478
479         local_irq_save(flags);
480         /* This shouldn't return.  If it returns, we have a problem */
481         status = acpi_enter_sleep_state(ACPI_STATE_S4);
482         /* Reprogram control registers and execute _BFS */
483         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
484         local_irq_restore(flags);
485
486         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
487 }
488
489 static void acpi_hibernation_leave(void)
490 {
491         /*
492          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
493          * enable it here.
494          */
495         acpi_enable();
496         /* Reprogram control registers and execute _BFS */
497         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
498         /* Check the hardware signature */
499         if (facs && s4_hardware_signature != facs->hardware_signature) {
500                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
501                         "cannot resume!\n");
502                 panic("ACPI S4 hardware signature mismatch");
503         }
504         /* Restore the NVS memory area */
505         suspend_nvs_restore();
506         /* Allow EC transactions to happen. */
507         acpi_ec_unblock_transactions_early();
508 }
509
510 static void acpi_pm_thaw(void)
511 {
512         acpi_ec_unblock_transactions();
513         acpi_enable_all_runtime_gpes();
514 }
515
516 static struct platform_hibernation_ops acpi_hibernation_ops = {
517         .begin = acpi_hibernation_begin,
518         .end = acpi_pm_end,
519         .pre_snapshot = acpi_pm_prepare,
520         .finish = acpi_pm_finish,
521         .prepare = acpi_pm_prepare,
522         .enter = acpi_hibernation_enter,
523         .leave = acpi_hibernation_leave,
524         .pre_restore = acpi_pm_freeze,
525         .restore_cleanup = acpi_pm_thaw,
526 };
527
528 /**
529  *      acpi_hibernation_begin_old - Set the target system sleep state to
530  *              ACPI_STATE_S4 and execute the _PTS control method.  This
531  *              function is used if the pre-ACPI 2.0 suspend ordering has been
532  *              requested.
533  */
534 static int acpi_hibernation_begin_old(void)
535 {
536         int error;
537         /*
538          * The _TTS object should always be evaluated before the _PTS object.
539          * When the old_suspended_ordering is true, the _PTS object is
540          * evaluated in the acpi_sleep_prepare.
541          */
542         acpi_sleep_tts_switch(ACPI_STATE_S4);
543
544         error = acpi_sleep_prepare(ACPI_STATE_S4);
545
546         if (!error) {
547                 if (!nvs_nosave)
548                         error = suspend_nvs_alloc();
549                 if (!error)
550                         acpi_target_sleep_state = ACPI_STATE_S4;
551         }
552         return error;
553 }
554
555 /*
556  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
557  * been requested.
558  */
559 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
560         .begin = acpi_hibernation_begin_old,
561         .end = acpi_pm_end,
562         .pre_snapshot = acpi_pm_pre_suspend,
563         .prepare = acpi_pm_freeze,
564         .finish = acpi_pm_finish,
565         .enter = acpi_hibernation_enter,
566         .leave = acpi_hibernation_leave,
567         .pre_restore = acpi_pm_freeze,
568         .restore_cleanup = acpi_pm_thaw,
569         .recover = acpi_pm_finish,
570 };
571 #endif /* CONFIG_HIBERNATION */
572
573 int acpi_suspend(u32 acpi_state)
574 {
575         suspend_state_t states[] = {
576                 [1] = PM_SUSPEND_STANDBY,
577                 [3] = PM_SUSPEND_MEM,
578                 [5] = PM_SUSPEND_MAX
579         };
580
581         if (acpi_state < 6 && states[acpi_state])
582                 return pm_suspend(states[acpi_state]);
583         if (acpi_state == 4)
584                 return hibernate();
585         return -EINVAL;
586 }
587
588 #ifdef CONFIG_PM_OPS
589 /**
590  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
591  *              in the system sleep state given by %acpi_target_sleep_state
592  *      @dev: device to examine; its driver model wakeup flags control
593  *              whether it should be able to wake up the system
594  *      @d_min_p: used to store the upper limit of allowed states range
595  *      Return value: preferred power state of the device on success, -ENODEV on
596  *              failure (ie. if there's no 'struct acpi_device' for @dev)
597  *
598  *      Find the lowest power (highest number) ACPI device power state that
599  *      device @dev can be in while the system is in the sleep state represented
600  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
601  *      able to wake up the system from this sleep state.  If @d_min_p is set,
602  *      the highest power (lowest number) device power state of @dev allowed
603  *      in this system sleep state is stored at the location pointed to by it.
604  *
605  *      The caller must ensure that @dev is valid before using this function.
606  *      The caller is also responsible for figuring out if the device is
607  *      supposed to be able to wake up the system and passing this information
608  *      via @wake.
609  */
610
611 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
612 {
613         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
614         struct acpi_device *adev;
615         char acpi_method[] = "_SxD";
616         unsigned long long d_min, d_max;
617
618         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
619                 printk(KERN_DEBUG "ACPI handle has no context!\n");
620                 return -ENODEV;
621         }
622
623         acpi_method[2] = '0' + acpi_target_sleep_state;
624         /*
625          * If the sleep state is S0, we will return D3, but if the device has
626          * _S0W, we will use the value from _S0W
627          */
628         d_min = ACPI_STATE_D0;
629         d_max = ACPI_STATE_D3;
630
631         /*
632          * If present, _SxD methods return the minimum D-state (highest power
633          * state) we can use for the corresponding S-states.  Otherwise, the
634          * minimum D-state is D0 (ACPI 3.x).
635          *
636          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
637          * provided -- that's our fault recovery, we ignore retval.
638          */
639         if (acpi_target_sleep_state > ACPI_STATE_S0)
640                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
641
642         /*
643          * If _PRW says we can wake up the system from the target sleep state,
644          * the D-state returned by _SxD is sufficient for that (we assume a
645          * wakeup-aware driver if wake is set).  Still, if _SxW exists
646          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
647          * can wake the system.  _S0W may be valid, too.
648          */
649         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
650             (device_may_wakeup(dev) &&
651              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
652                 acpi_status status;
653
654                 acpi_method[3] = 'W';
655                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
656                                                 &d_max);
657                 if (ACPI_FAILURE(status)) {
658                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
659                             status != AE_NOT_FOUND)
660                                 d_max = d_min;
661                 } else if (d_max < d_min) {
662                         /* Warn the user of the broken DSDT */
663                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
664                                 acpi_method);
665                         /* Sanitize it */
666                         d_min = d_max;
667                 }
668         }
669
670         if (d_min_p)
671                 *d_min_p = d_min;
672         return d_max;
673 }
674 #endif /* CONFIG_PM_OPS */
675
676 #ifdef CONFIG_PM_SLEEP
677 /**
678  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
679  *                                  capability of given device
680  *      @dev: device to handle
681  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
682  */
683 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
684 {
685         acpi_handle handle;
686         struct acpi_device *adev;
687         int error;
688
689         if (!device_can_wakeup(dev))
690                 return -EINVAL;
691
692         handle = DEVICE_ACPI_HANDLE(dev);
693         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
694                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
695                 return -ENODEV;
696         }
697
698         error = enable ?
699                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
700                 acpi_disable_wakeup_device_power(adev);
701         if (!error)
702                 dev_info(dev, "wake-up capability %s by ACPI\n",
703                                 enable ? "enabled" : "disabled");
704
705         return error;
706 }
707 #endif  /* CONFIG_PM_SLEEP */
708
709 static void acpi_power_off_prepare(void)
710 {
711         /* Prepare to power off the system */
712         acpi_sleep_prepare(ACPI_STATE_S5);
713         acpi_disable_all_gpes();
714 }
715
716 static void acpi_power_off(void)
717 {
718         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
719         printk(KERN_DEBUG "%s called\n", __func__);
720         local_irq_disable();
721         acpi_enter_sleep_state(ACPI_STATE_S5);
722 }
723
724 /*
725  * ACPI 2.0 created the optional _GTS and _BFS,
726  * but industry adoption has been neither rapid nor broad.
727  *
728  * Linux gets into trouble when it executes poorly validated
729  * paths through the BIOS, so disable _GTS and _BFS by default,
730  * but do speak up and offer the option to enable them.
731  */
732 static void __init acpi_gts_bfs_check(void)
733 {
734         acpi_handle dummy;
735
736         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
737         {
738                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
739                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
740                         "please notify linux-acpi@vger.kernel.org\n");
741         }
742         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
743         {
744                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
745                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
746                         "please notify linux-acpi@vger.kernel.org\n");
747         }
748 }
749
750 int __init acpi_sleep_init(void)
751 {
752         acpi_status status;
753         u8 type_a, type_b;
754 #ifdef CONFIG_SUSPEND
755         int i = 0;
756
757         dmi_check_system(acpisleep_dmi_table);
758 #endif
759
760         if (acpi_disabled)
761                 return 0;
762
763         sleep_states[ACPI_STATE_S0] = 1;
764         printk(KERN_INFO PREFIX "(supports S0");
765
766 #ifdef CONFIG_SUSPEND
767         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
768                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
769                 if (ACPI_SUCCESS(status)) {
770                         sleep_states[i] = 1;
771                         printk(" S%d", i);
772                 }
773         }
774
775         suspend_set_ops(old_suspend_ordering ?
776                 &acpi_suspend_ops_old : &acpi_suspend_ops);
777 #endif
778
779 #ifdef CONFIG_HIBERNATION
780         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
781         if (ACPI_SUCCESS(status)) {
782                 hibernation_set_ops(old_suspend_ordering ?
783                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
784                 sleep_states[ACPI_STATE_S4] = 1;
785                 printk(" S4");
786                 if (!nosigcheck) {
787                         acpi_get_table(ACPI_SIG_FACS, 1,
788                                 (struct acpi_table_header **)&facs);
789                         if (facs)
790                                 s4_hardware_signature =
791                                         facs->hardware_signature;
792                 }
793         }
794 #endif
795         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
796         if (ACPI_SUCCESS(status)) {
797                 sleep_states[ACPI_STATE_S5] = 1;
798                 printk(" S5");
799                 pm_power_off_prepare = acpi_power_off_prepare;
800                 pm_power_off = acpi_power_off;
801         }
802         printk(")\n");
803         /*
804          * Register the tts_notifier to reboot notifier list so that the _TTS
805          * object can also be evaluated when the system enters S5.
806          */
807         register_reboot_notifier(&tts_notifier);
808         acpi_gts_bfs_check();
809         return 0;
810 }