ACPI / PM: Call acpi_save_state_mem() right before low-level suspend
[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         suspend_nvs_free();
170
171         if (acpi_state == ACPI_STATE_S0)
172                 return;
173
174         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
175                 acpi_state);
176         acpi_disable_wakeup_devices(acpi_state);
177         acpi_leave_sleep_state(acpi_state);
178
179         /* reset firmware waking vector */
180         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
181
182         acpi_target_sleep_state = ACPI_STATE_S0;
183 }
184
185 /**
186  *      acpi_pm_end - Finish up suspend sequence.
187  */
188 static void acpi_pm_end(void)
189 {
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         u32 acpi_state = acpi_target_sleep_state;
247         int error;
248
249         ACPI_FLUSH_CPU_CACHE();
250
251         switch (acpi_state) {
252         case ACPI_STATE_S1:
253                 barrier();
254                 status = acpi_enter_sleep_state(acpi_state);
255                 break;
256
257         case ACPI_STATE_S3:
258                 error = acpi_save_state_mem();
259                 if (error)
260                         return error;
261                 do_suspend_lowlevel();
262                 pr_info(PREFIX "Low-level resume complete\n");
263                 break;
264         }
265
266         /* This violates the spec but is required for bug compatibility. */
267         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
268
269         /* Reprogram control registers and execute _BFS */
270         acpi_leave_sleep_state_prep(acpi_state);
271
272         /* ACPI 3.0 specs (P62) says that it's the responsibility
273          * of the OSPM to clear the status bit [ implying that the
274          * POWER_BUTTON event should not reach userspace ]
275          */
276         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
277                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
278
279         /*
280          * Disable and clear GPE status before interrupt is enabled. Some GPEs
281          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
282          * acpi_leave_sleep_state will reenable specific GPEs later
283          */
284         acpi_disable_all_gpes();
285         /* Allow EC transactions to happen. */
286         acpi_ec_unblock_transactions_early();
287
288         suspend_nvs_restore();
289
290         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
291 }
292
293 static int acpi_suspend_state_valid(suspend_state_t pm_state)
294 {
295         u32 acpi_state;
296
297         switch (pm_state) {
298         case PM_SUSPEND_ON:
299         case PM_SUSPEND_STANDBY:
300         case PM_SUSPEND_MEM:
301                 acpi_state = acpi_suspend_states[pm_state];
302
303                 return sleep_states[acpi_state];
304         default:
305                 return 0;
306         }
307 }
308
309 static const struct platform_suspend_ops acpi_suspend_ops = {
310         .valid = acpi_suspend_state_valid,
311         .begin = acpi_suspend_begin,
312         .prepare_late = acpi_pm_prepare,
313         .enter = acpi_suspend_enter,
314         .wake = acpi_pm_finish,
315         .end = acpi_pm_end,
316 };
317
318 /**
319  *      acpi_suspend_begin_old - Set the target system sleep state to the
320  *              state associated with given @pm_state, if supported, and
321  *              execute the _PTS control method.  This function is used if the
322  *              pre-ACPI 2.0 suspend ordering has been requested.
323  */
324 static int acpi_suspend_begin_old(suspend_state_t pm_state)
325 {
326         int error = acpi_suspend_begin(pm_state);
327         if (!error)
328                 error = __acpi_pm_prepare();
329
330         return error;
331 }
332
333 /*
334  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
335  * been requested.
336  */
337 static const struct platform_suspend_ops acpi_suspend_ops_old = {
338         .valid = acpi_suspend_state_valid,
339         .begin = acpi_suspend_begin_old,
340         .prepare_late = acpi_pm_pre_suspend,
341         .enter = acpi_suspend_enter,
342         .wake = acpi_pm_finish,
343         .end = acpi_pm_end,
344         .recover = acpi_pm_finish,
345 };
346
347 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
348 {
349         old_suspend_ordering = true;
350         return 0;
351 }
352
353 static int __init init_nvs_nosave(const struct dmi_system_id *d)
354 {
355         acpi_nvs_nosave();
356         return 0;
357 }
358
359 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
360         {
361         .callback = init_old_suspend_ordering,
362         .ident = "Abit KN9 (nForce4 variant)",
363         .matches = {
364                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
365                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
366                 },
367         },
368         {
369         .callback = init_old_suspend_ordering,
370         .ident = "HP xw4600 Workstation",
371         .matches = {
372                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
373                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
374                 },
375         },
376         {
377         .callback = init_old_suspend_ordering,
378         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
379         .matches = {
380                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
381                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
382                 },
383         },
384         {
385         .callback = init_old_suspend_ordering,
386         .ident = "Panasonic CF51-2L",
387         .matches = {
388                 DMI_MATCH(DMI_BOARD_VENDOR,
389                                 "Matsushita Electric Industrial Co.,Ltd."),
390                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
391                 },
392         },
393         {
394         .callback = init_nvs_nosave,
395         .ident = "Sony Vaio VGN-SR11M",
396         .matches = {
397                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
398                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
399                 },
400         },
401         {
402         .callback = init_nvs_nosave,
403         .ident = "Everex StepNote Series",
404         .matches = {
405                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
406                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
407                 },
408         },
409         {
410         .callback = init_nvs_nosave,
411         .ident = "Sony Vaio VPCEB1Z1E",
412         .matches = {
413                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
414                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
415                 },
416         },
417         {
418         .callback = init_nvs_nosave,
419         .ident = "Sony Vaio VGN-NW130D",
420         .matches = {
421                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
422                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
423                 },
424         },
425         {
426         .callback = init_nvs_nosave,
427         .ident = "Averatec AV1020-ED2",
428         .matches = {
429                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
430                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
431                 },
432         },
433         {},
434 };
435 #endif /* CONFIG_SUSPEND */
436
437 #ifdef CONFIG_HIBERNATION
438 static unsigned long s4_hardware_signature;
439 static struct acpi_table_facs *facs;
440 static bool nosigcheck;
441
442 void __init acpi_no_s4_hw_signature(void)
443 {
444         nosigcheck = true;
445 }
446
447 static int acpi_hibernation_begin(void)
448 {
449         int error;
450
451         error = nvs_nosave ? 0 : suspend_nvs_alloc();
452         if (!error) {
453                 acpi_target_sleep_state = ACPI_STATE_S4;
454                 acpi_sleep_tts_switch(acpi_target_sleep_state);
455         }
456
457         return error;
458 }
459
460 static int acpi_hibernation_enter(void)
461 {
462         acpi_status status = AE_OK;
463         unsigned long flags = 0;
464
465         ACPI_FLUSH_CPU_CACHE();
466
467         local_irq_save(flags);
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_leave(void)
478 {
479         /*
480          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
481          * enable it here.
482          */
483         acpi_enable();
484         /* Reprogram control registers and execute _BFS */
485         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
486         /* Check the hardware signature */
487         if (facs && s4_hardware_signature != facs->hardware_signature) {
488                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
489                         "cannot resume!\n");
490                 panic("ACPI S4 hardware signature mismatch");
491         }
492         /* Restore the NVS memory area */
493         suspend_nvs_restore();
494         /* Allow EC transactions to happen. */
495         acpi_ec_unblock_transactions_early();
496 }
497
498 static void acpi_pm_thaw(void)
499 {
500         acpi_ec_unblock_transactions();
501         acpi_enable_all_runtime_gpes();
502 }
503
504 static const struct platform_hibernation_ops acpi_hibernation_ops = {
505         .begin = acpi_hibernation_begin,
506         .end = acpi_pm_end,
507         .pre_snapshot = acpi_pm_prepare,
508         .finish = acpi_pm_finish,
509         .prepare = acpi_pm_prepare,
510         .enter = acpi_hibernation_enter,
511         .leave = acpi_hibernation_leave,
512         .pre_restore = acpi_pm_freeze,
513         .restore_cleanup = acpi_pm_thaw,
514 };
515
516 /**
517  *      acpi_hibernation_begin_old - Set the target system sleep state to
518  *              ACPI_STATE_S4 and execute the _PTS control method.  This
519  *              function is used if the pre-ACPI 2.0 suspend ordering has been
520  *              requested.
521  */
522 static int acpi_hibernation_begin_old(void)
523 {
524         int error;
525         /*
526          * The _TTS object should always be evaluated before the _PTS object.
527          * When the old_suspended_ordering is true, the _PTS object is
528          * evaluated in the acpi_sleep_prepare.
529          */
530         acpi_sleep_tts_switch(ACPI_STATE_S4);
531
532         error = acpi_sleep_prepare(ACPI_STATE_S4);
533
534         if (!error) {
535                 if (!nvs_nosave)
536                         error = suspend_nvs_alloc();
537                 if (!error)
538                         acpi_target_sleep_state = ACPI_STATE_S4;
539         }
540         return error;
541 }
542
543 /*
544  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
545  * been requested.
546  */
547 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
548         .begin = acpi_hibernation_begin_old,
549         .end = acpi_pm_end,
550         .pre_snapshot = acpi_pm_pre_suspend,
551         .prepare = acpi_pm_freeze,
552         .finish = acpi_pm_finish,
553         .enter = acpi_hibernation_enter,
554         .leave = acpi_hibernation_leave,
555         .pre_restore = acpi_pm_freeze,
556         .restore_cleanup = acpi_pm_thaw,
557         .recover = acpi_pm_finish,
558 };
559 #endif /* CONFIG_HIBERNATION */
560
561 int acpi_suspend(u32 acpi_state)
562 {
563         suspend_state_t states[] = {
564                 [1] = PM_SUSPEND_STANDBY,
565                 [3] = PM_SUSPEND_MEM,
566                 [5] = PM_SUSPEND_MAX
567         };
568
569         if (acpi_state < 6 && states[acpi_state])
570                 return pm_suspend(states[acpi_state]);
571         if (acpi_state == 4)
572                 return hibernate();
573         return -EINVAL;
574 }
575
576 #ifdef CONFIG_PM_OPS
577 /**
578  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
579  *              in the system sleep state given by %acpi_target_sleep_state
580  *      @dev: device to examine; its driver model wakeup flags control
581  *              whether it should be able to wake up the system
582  *      @d_min_p: used to store the upper limit of allowed states range
583  *      Return value: preferred power state of the device on success, -ENODEV on
584  *              failure (ie. if there's no 'struct acpi_device' for @dev)
585  *
586  *      Find the lowest power (highest number) ACPI device power state that
587  *      device @dev can be in while the system is in the sleep state represented
588  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
589  *      able to wake up the system from this sleep state.  If @d_min_p is set,
590  *      the highest power (lowest number) device power state of @dev allowed
591  *      in this system sleep state is stored at the location pointed to by it.
592  *
593  *      The caller must ensure that @dev is valid before using this function.
594  *      The caller is also responsible for figuring out if the device is
595  *      supposed to be able to wake up the system and passing this information
596  *      via @wake.
597  */
598
599 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
600 {
601         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
602         struct acpi_device *adev;
603         char acpi_method[] = "_SxD";
604         unsigned long long d_min, d_max;
605
606         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
607                 printk(KERN_DEBUG "ACPI handle has no context!\n");
608                 return -ENODEV;
609         }
610
611         acpi_method[2] = '0' + acpi_target_sleep_state;
612         /*
613          * If the sleep state is S0, we will return D3, but if the device has
614          * _S0W, we will use the value from _S0W
615          */
616         d_min = ACPI_STATE_D0;
617         d_max = ACPI_STATE_D3;
618
619         /*
620          * If present, _SxD methods return the minimum D-state (highest power
621          * state) we can use for the corresponding S-states.  Otherwise, the
622          * minimum D-state is D0 (ACPI 3.x).
623          *
624          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
625          * provided -- that's our fault recovery, we ignore retval.
626          */
627         if (acpi_target_sleep_state > ACPI_STATE_S0)
628                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
629
630         /*
631          * If _PRW says we can wake up the system from the target sleep state,
632          * the D-state returned by _SxD is sufficient for that (we assume a
633          * wakeup-aware driver if wake is set).  Still, if _SxW exists
634          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
635          * can wake the system.  _S0W may be valid, too.
636          */
637         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
638             (device_may_wakeup(dev) &&
639              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
640                 acpi_status status;
641
642                 acpi_method[3] = 'W';
643                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
644                                                 &d_max);
645                 if (ACPI_FAILURE(status)) {
646                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
647                             status != AE_NOT_FOUND)
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 #endif /* CONFIG_PM_OPS */
663
664 #ifdef CONFIG_PM_SLEEP
665 /**
666  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
667  *                                  capability of given device
668  *      @dev: device to handle
669  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
670  */
671 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
672 {
673         acpi_handle handle;
674         struct acpi_device *adev;
675         int error;
676
677         if (!device_can_wakeup(dev))
678                 return -EINVAL;
679
680         handle = DEVICE_ACPI_HANDLE(dev);
681         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
682                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
683                 return -ENODEV;
684         }
685
686         error = enable ?
687                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
688                 acpi_disable_wakeup_device_power(adev);
689         if (!error)
690                 dev_info(dev, "wake-up capability %s by ACPI\n",
691                                 enable ? "enabled" : "disabled");
692
693         return error;
694 }
695 #endif  /* CONFIG_PM_SLEEP */
696
697 static void acpi_power_off_prepare(void)
698 {
699         /* Prepare to power off the system */
700         acpi_sleep_prepare(ACPI_STATE_S5);
701         acpi_disable_all_gpes();
702 }
703
704 static void acpi_power_off(void)
705 {
706         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
707         printk(KERN_DEBUG "%s called\n", __func__);
708         local_irq_disable();
709         acpi_enter_sleep_state(ACPI_STATE_S5);
710 }
711
712 /*
713  * ACPI 2.0 created the optional _GTS and _BFS,
714  * but industry adoption has been neither rapid nor broad.
715  *
716  * Linux gets into trouble when it executes poorly validated
717  * paths through the BIOS, so disable _GTS and _BFS by default,
718  * but do speak up and offer the option to enable them.
719  */
720 static void __init acpi_gts_bfs_check(void)
721 {
722         acpi_handle dummy;
723
724         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
725         {
726                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
727                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
728                         "please notify linux-acpi@vger.kernel.org\n");
729         }
730         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
731         {
732                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
733                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
734                         "please notify linux-acpi@vger.kernel.org\n");
735         }
736 }
737
738 int __init acpi_sleep_init(void)
739 {
740         acpi_status status;
741         u8 type_a, type_b;
742 #ifdef CONFIG_SUSPEND
743         int i = 0;
744
745         dmi_check_system(acpisleep_dmi_table);
746 #endif
747
748         if (acpi_disabled)
749                 return 0;
750
751         sleep_states[ACPI_STATE_S0] = 1;
752         printk(KERN_INFO PREFIX "(supports S0");
753
754 #ifdef CONFIG_SUSPEND
755         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
756                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
757                 if (ACPI_SUCCESS(status)) {
758                         sleep_states[i] = 1;
759                         printk(" S%d", i);
760                 }
761         }
762
763         suspend_set_ops(old_suspend_ordering ?
764                 &acpi_suspend_ops_old : &acpi_suspend_ops);
765 #endif
766
767 #ifdef CONFIG_HIBERNATION
768         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
769         if (ACPI_SUCCESS(status)) {
770                 hibernation_set_ops(old_suspend_ordering ?
771                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
772                 sleep_states[ACPI_STATE_S4] = 1;
773                 printk(" S4");
774                 if (!nosigcheck) {
775                         acpi_get_table(ACPI_SIG_FACS, 1,
776                                 (struct acpi_table_header **)&facs);
777                         if (facs)
778                                 s4_hardware_signature =
779                                         facs->hardware_signature;
780                 }
781         }
782 #endif
783         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
784         if (ACPI_SUCCESS(status)) {
785                 sleep_states[ACPI_STATE_S5] = 1;
786                 printk(" S5");
787                 pm_power_off_prepare = acpi_power_off_prepare;
788                 pm_power_off = acpi_power_off;
789         }
790         printk(")\n");
791         /*
792          * Register the tts_notifier to reboot notifier list so that the _TTS
793          * object can also be evaluated when the system enters S5.
794          */
795         register_reboot_notifier(&tts_notifier);
796         acpi_gts_bfs_check();
797         return 0;
798 }