Merge branch 'bugzilla-13931-sleep-nvs' 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 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 /*
85  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
86  * user to request that behavior by using the 'acpi_old_suspend_ordering'
87  * kernel command line option that causes the following variable to be set.
88  */
89 static bool old_suspend_ordering;
90
91 void __init acpi_old_suspend_ordering(void)
92 {
93         old_suspend_ordering = true;
94 }
95
96 /**
97  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
98  */
99 static int acpi_pm_freeze(void)
100 {
101         acpi_disable_all_gpes();
102         acpi_os_wait_events_complete(NULL);
103         acpi_ec_block_transactions();
104         return 0;
105 }
106
107 /**
108  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
109  *
110  *      If necessary, set the firmware waking vector and do arch-specific
111  *      nastiness to get the wakeup code to the waking vector.
112  */
113 static int __acpi_pm_prepare(void)
114 {
115         int error = acpi_sleep_prepare(acpi_target_sleep_state);
116
117         suspend_nvs_save();
118
119         if (error)
120                 acpi_target_sleep_state = ACPI_STATE_S0;
121         return error;
122 }
123
124 /**
125  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
126  *              state and disable the GPEs.
127  */
128 static int acpi_pm_prepare(void)
129 {
130         int error = __acpi_pm_prepare();
131
132         if (!error)
133                 acpi_pm_freeze();
134
135         return error;
136 }
137
138 /**
139  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
140  *
141  *      This is called after we wake back up (or if entering the sleep state
142  *      failed).
143  */
144 static void acpi_pm_finish(void)
145 {
146         u32 acpi_state = acpi_target_sleep_state;
147
148         suspend_nvs_free();
149         acpi_ec_unblock_transactions();
150
151         if (acpi_state == ACPI_STATE_S0)
152                 return;
153
154         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
155                 acpi_state);
156         acpi_disable_wakeup_device(acpi_state);
157         acpi_leave_sleep_state(acpi_state);
158
159         /* reset firmware waking vector */
160         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
161
162         acpi_target_sleep_state = ACPI_STATE_S0;
163 }
164
165 /**
166  *      acpi_pm_end - Finish up suspend sequence.
167  */
168 static void acpi_pm_end(void)
169 {
170         /*
171          * This is necessary in case acpi_pm_finish() is not called during a
172          * failing transition to a sleep state.
173          */
174         acpi_target_sleep_state = ACPI_STATE_S0;
175         acpi_sleep_tts_switch(acpi_target_sleep_state);
176 }
177 #else /* !CONFIG_ACPI_SLEEP */
178 #define acpi_target_sleep_state ACPI_STATE_S0
179 #endif /* CONFIG_ACPI_SLEEP */
180
181 #ifdef CONFIG_SUSPEND
182 extern void do_suspend_lowlevel(void);
183
184 static u32 acpi_suspend_states[] = {
185         [PM_SUSPEND_ON] = ACPI_STATE_S0,
186         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
187         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
188         [PM_SUSPEND_MAX] = ACPI_STATE_S5
189 };
190
191 /**
192  *      acpi_suspend_begin - Set the target system sleep state to the state
193  *              associated with given @pm_state, if supported.
194  */
195 static int acpi_suspend_begin(suspend_state_t pm_state)
196 {
197         u32 acpi_state = acpi_suspend_states[pm_state];
198         int error = 0;
199
200         error = suspend_nvs_alloc();
201
202         if (error)
203                 return error;
204
205         if (sleep_states[acpi_state]) {
206                 acpi_target_sleep_state = acpi_state;
207                 acpi_sleep_tts_switch(acpi_target_sleep_state);
208         } else {
209                 printk(KERN_ERR "ACPI does not support this state: %d\n",
210                         pm_state);
211                 error = -ENOSYS;
212         }
213         return error;
214 }
215
216 /**
217  *      acpi_suspend_enter - Actually enter a sleep state.
218  *      @pm_state: ignored
219  *
220  *      Flush caches and go to sleep. For STR we have to call arch-specific
221  *      assembly, which in turn call acpi_enter_sleep_state().
222  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
223  */
224 static int acpi_suspend_enter(suspend_state_t pm_state)
225 {
226         acpi_status status = AE_OK;
227         unsigned long flags = 0;
228         u32 acpi_state = acpi_target_sleep_state;
229
230         ACPI_FLUSH_CPU_CACHE();
231
232         /* Do arch specific saving of state. */
233         if (acpi_state == ACPI_STATE_S3) {
234                 int error = acpi_save_state_mem();
235
236                 if (error)
237                         return error;
238         }
239
240         local_irq_save(flags);
241         acpi_enable_wakeup_device(acpi_state);
242         switch (acpi_state) {
243         case ACPI_STATE_S1:
244                 barrier();
245                 status = acpi_enter_sleep_state(acpi_state);
246                 break;
247
248         case ACPI_STATE_S3:
249                 do_suspend_lowlevel();
250                 break;
251         }
252
253         /* This violates the spec but is required for bug compatibility. */
254         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
255
256         /* Reprogram control registers and execute _BFS */
257         acpi_leave_sleep_state_prep(acpi_state);
258
259         /* ACPI 3.0 specs (P62) says that it's the responsibility
260          * of the OSPM to clear the status bit [ implying that the
261          * POWER_BUTTON event should not reach userspace ]
262          */
263         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
264                 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
265
266         /*
267          * Disable and clear GPE status before interrupt is enabled. Some GPEs
268          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
269          * acpi_leave_sleep_state will reenable specific GPEs later
270          */
271         acpi_disable_all_gpes();
272         /* Allow EC transactions to happen. */
273         acpi_ec_unblock_transactions_early();
274
275         local_irq_restore(flags);
276         printk(KERN_DEBUG "Back to C!\n");
277
278         /* restore processor state */
279         if (acpi_state == ACPI_STATE_S3)
280                 acpi_restore_state_mem();
281
282         suspend_nvs_restore();
283
284         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
285 }
286
287 static void acpi_suspend_finish(void)
288 {
289         acpi_pm_finish();
290 }
291
292 static int acpi_suspend_state_valid(suspend_state_t pm_state)
293 {
294         u32 acpi_state;
295
296         switch (pm_state) {
297         case PM_SUSPEND_ON:
298         case PM_SUSPEND_STANDBY:
299         case PM_SUSPEND_MEM:
300                 acpi_state = acpi_suspend_states[pm_state];
301
302                 return sleep_states[acpi_state];
303         default:
304                 return 0;
305         }
306 }
307
308 static struct platform_suspend_ops acpi_suspend_ops = {
309         .valid = acpi_suspend_state_valid,
310         .begin = acpi_suspend_begin,
311         .prepare_late = acpi_pm_prepare,
312         .enter = acpi_suspend_enter,
313         .wake = acpi_suspend_finish,
314         .end = acpi_pm_end,
315 };
316
317 /**
318  *      acpi_suspend_begin_old - Set the target system sleep state to the
319  *              state associated with given @pm_state, if supported, and
320  *              execute the _PTS control method.  This function is used if the
321  *              pre-ACPI 2.0 suspend ordering has been requested.
322  */
323 static int acpi_suspend_begin_old(suspend_state_t pm_state)
324 {
325         int error = acpi_suspend_begin(pm_state);
326
327         if (!error)
328                 error = __acpi_pm_prepare();
329         return error;
330 }
331
332 /*
333  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
334  * been requested.
335  */
336 static struct platform_suspend_ops acpi_suspend_ops_old = {
337         .valid = acpi_suspend_state_valid,
338         .begin = acpi_suspend_begin_old,
339         .prepare_late = acpi_pm_freeze,
340         .enter = acpi_suspend_enter,
341         .wake = acpi_suspend_finish,
342         .end = acpi_pm_end,
343         .recover = acpi_pm_finish,
344 };
345
346 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
347 {
348         old_suspend_ordering = true;
349         return 0;
350 }
351
352 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
353         {
354         .callback = init_old_suspend_ordering,
355         .ident = "Abit KN9 (nForce4 variant)",
356         .matches = {
357                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
358                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
359                 },
360         },
361         {
362         .callback = init_old_suspend_ordering,
363         .ident = "HP xw4600 Workstation",
364         .matches = {
365                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
366                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
367                 },
368         },
369         {
370         .callback = init_old_suspend_ordering,
371         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
372         .matches = {
373                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
374                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
375                 },
376         },
377         {
378         .callback = init_old_suspend_ordering,
379         .ident = "Panasonic CF51-2L",
380         .matches = {
381                 DMI_MATCH(DMI_BOARD_VENDOR,
382                                 "Matsushita Electric Industrial Co.,Ltd."),
383                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
384                 },
385         },
386         {},
387 };
388 #endif /* CONFIG_SUSPEND */
389
390 #ifdef CONFIG_HIBERNATION
391 /*
392  * The ACPI specification wants us to save NVS memory regions during hibernation
393  * and to restore them during the subsequent resume.  However, it is not certain
394  * if this mechanism is going to work on all machines, so we allow the user to
395  * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
396  * option.
397  */
398 static bool s4_no_nvs;
399
400 void __init acpi_s4_no_nvs(void)
401 {
402         s4_no_nvs = true;
403 }
404
405 static unsigned long s4_hardware_signature;
406 static struct acpi_table_facs *facs;
407 static bool nosigcheck;
408
409 void __init acpi_no_s4_hw_signature(void)
410 {
411         nosigcheck = true;
412 }
413
414 static int acpi_hibernation_begin(void)
415 {
416         int error;
417
418         error = s4_no_nvs ? 0 : suspend_nvs_alloc();
419         if (!error) {
420                 acpi_target_sleep_state = ACPI_STATE_S4;
421                 acpi_sleep_tts_switch(acpi_target_sleep_state);
422         }
423
424         return error;
425 }
426
427 static int acpi_hibernation_pre_snapshot(void)
428 {
429         int error = acpi_pm_prepare();
430
431         if (!error)
432                 suspend_nvs_save();
433
434         return error;
435 }
436
437 static int acpi_hibernation_enter(void)
438 {
439         acpi_status status = AE_OK;
440         unsigned long flags = 0;
441
442         ACPI_FLUSH_CPU_CACHE();
443
444         local_irq_save(flags);
445         acpi_enable_wakeup_device(ACPI_STATE_S4);
446         /* This shouldn't return.  If it returns, we have a problem */
447         status = acpi_enter_sleep_state(ACPI_STATE_S4);
448         /* Reprogram control registers and execute _BFS */
449         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
450         local_irq_restore(flags);
451
452         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
453 }
454
455 static void acpi_hibernation_leave(void)
456 {
457         /*
458          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
459          * enable it here.
460          */
461         acpi_enable();
462         /* Reprogram control registers and execute _BFS */
463         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
464         /* Check the hardware signature */
465         if (facs && s4_hardware_signature != facs->hardware_signature) {
466                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
467                         "cannot resume!\n");
468                 panic("ACPI S4 hardware signature mismatch");
469         }
470         /* Restore the NVS memory area */
471         suspend_nvs_restore();
472         /* Allow EC transactions to happen. */
473         acpi_ec_unblock_transactions_early();
474 }
475
476 static void acpi_pm_thaw(void)
477 {
478         acpi_ec_unblock_transactions();
479         acpi_enable_all_runtime_gpes();
480 }
481
482 static struct platform_hibernation_ops acpi_hibernation_ops = {
483         .begin = acpi_hibernation_begin,
484         .end = acpi_pm_end,
485         .pre_snapshot = acpi_hibernation_pre_snapshot,
486         .finish = acpi_pm_finish,
487         .prepare = acpi_pm_prepare,
488         .enter = acpi_hibernation_enter,
489         .leave = acpi_hibernation_leave,
490         .pre_restore = acpi_pm_freeze,
491         .restore_cleanup = acpi_pm_thaw,
492 };
493
494 /**
495  *      acpi_hibernation_begin_old - Set the target system sleep state to
496  *              ACPI_STATE_S4 and execute the _PTS control method.  This
497  *              function is used if the pre-ACPI 2.0 suspend ordering has been
498  *              requested.
499  */
500 static int acpi_hibernation_begin_old(void)
501 {
502         int error;
503         /*
504          * The _TTS object should always be evaluated before the _PTS object.
505          * When the old_suspended_ordering is true, the _PTS object is
506          * evaluated in the acpi_sleep_prepare.
507          */
508         acpi_sleep_tts_switch(ACPI_STATE_S4);
509
510         error = acpi_sleep_prepare(ACPI_STATE_S4);
511
512         if (!error) {
513                 if (!s4_no_nvs)
514                         error = suspend_nvs_alloc();
515                 if (!error)
516                         acpi_target_sleep_state = ACPI_STATE_S4;
517         }
518         return error;
519 }
520
521 static int acpi_hibernation_pre_snapshot_old(void)
522 {
523         acpi_pm_freeze();
524         suspend_nvs_save();
525         return 0;
526 }
527
528 /*
529  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
530  * been requested.
531  */
532 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
533         .begin = acpi_hibernation_begin_old,
534         .end = acpi_pm_end,
535         .pre_snapshot = acpi_hibernation_pre_snapshot_old,
536         .prepare = acpi_pm_freeze,
537         .finish = acpi_pm_finish,
538         .enter = acpi_hibernation_enter,
539         .leave = acpi_hibernation_leave,
540         .pre_restore = acpi_pm_freeze,
541         .restore_cleanup = acpi_pm_thaw,
542         .recover = acpi_pm_finish,
543 };
544 #endif /* CONFIG_HIBERNATION */
545
546 int acpi_suspend(u32 acpi_state)
547 {
548         suspend_state_t states[] = {
549                 [1] = PM_SUSPEND_STANDBY,
550                 [3] = PM_SUSPEND_MEM,
551                 [5] = PM_SUSPEND_MAX
552         };
553
554         if (acpi_state < 6 && states[acpi_state])
555                 return pm_suspend(states[acpi_state]);
556         if (acpi_state == 4)
557                 return hibernate();
558         return -EINVAL;
559 }
560
561 #ifdef CONFIG_PM_SLEEP
562 /**
563  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
564  *              in the system sleep state given by %acpi_target_sleep_state
565  *      @dev: device to examine; its driver model wakeup flags control
566  *              whether it should be able to wake up the system
567  *      @d_min_p: used to store the upper limit of allowed states range
568  *      Return value: preferred power state of the device on success, -ENODEV on
569  *              failure (ie. if there's no 'struct acpi_device' for @dev)
570  *
571  *      Find the lowest power (highest number) ACPI device power state that
572  *      device @dev can be in while the system is in the sleep state represented
573  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
574  *      able to wake up the system from this sleep state.  If @d_min_p is set,
575  *      the highest power (lowest number) device power state of @dev allowed
576  *      in this system sleep state is stored at the location pointed to by it.
577  *
578  *      The caller must ensure that @dev is valid before using this function.
579  *      The caller is also responsible for figuring out if the device is
580  *      supposed to be able to wake up the system and passing this information
581  *      via @wake.
582  */
583
584 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
585 {
586         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
587         struct acpi_device *adev;
588         char acpi_method[] = "_SxD";
589         unsigned long long d_min, d_max;
590
591         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
592                 printk(KERN_DEBUG "ACPI handle has no context!\n");
593                 return -ENODEV;
594         }
595
596         acpi_method[2] = '0' + acpi_target_sleep_state;
597         /*
598          * If the sleep state is S0, we will return D3, but if the device has
599          * _S0W, we will use the value from _S0W
600          */
601         d_min = ACPI_STATE_D0;
602         d_max = ACPI_STATE_D3;
603
604         /*
605          * If present, _SxD methods return the minimum D-state (highest power
606          * state) we can use for the corresponding S-states.  Otherwise, the
607          * minimum D-state is D0 (ACPI 3.x).
608          *
609          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
610          * provided -- that's our fault recovery, we ignore retval.
611          */
612         if (acpi_target_sleep_state > ACPI_STATE_S0)
613                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
614
615         /*
616          * If _PRW says we can wake up the system from the target sleep state,
617          * the D-state returned by _SxD is sufficient for that (we assume a
618          * wakeup-aware driver if wake is set).  Still, if _SxW exists
619          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
620          * can wake the system.  _S0W may be valid, too.
621          */
622         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
623             (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
624              adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
625                 acpi_status status;
626
627                 acpi_method[3] = 'W';
628                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
629                                                 &d_max);
630                 if (ACPI_FAILURE(status)) {
631                         d_max = d_min;
632                 } else if (d_max < d_min) {
633                         /* Warn the user of the broken DSDT */
634                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
635                                 acpi_method);
636                         /* Sanitize it */
637                         d_min = d_max;
638                 }
639         }
640
641         if (d_min_p)
642                 *d_min_p = d_min;
643         return d_max;
644 }
645
646 /**
647  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
648  *                                  capability of given device
649  *      @dev: device to handle
650  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
651  */
652 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
653 {
654         acpi_handle handle;
655         struct acpi_device *adev;
656         int error;
657
658         if (!device_can_wakeup(dev))
659                 return -EINVAL;
660
661         handle = DEVICE_ACPI_HANDLE(dev);
662         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
663                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
664                 return -ENODEV;
665         }
666
667         if (enable) {
668                 error = acpi_enable_wakeup_device_power(adev,
669                                                 acpi_target_sleep_state);
670                 if (!error)
671                         acpi_enable_gpe(adev->wakeup.gpe_device,
672                                         adev->wakeup.gpe_number,
673                                         ACPI_GPE_TYPE_WAKE);
674         } else {
675                 acpi_disable_gpe(adev->wakeup.gpe_device, adev->wakeup.gpe_number,
676                                 ACPI_GPE_TYPE_WAKE);
677                 error = acpi_disable_wakeup_device_power(adev);
678         }
679         if (!error)
680                 dev_info(dev, "wake-up capability %s by ACPI\n",
681                                 enable ? "enabled" : "disabled");
682
683         return error;
684 }
685 #endif
686
687 static void acpi_power_off_prepare(void)
688 {
689         /* Prepare to power off the system */
690         acpi_sleep_prepare(ACPI_STATE_S5);
691         acpi_disable_all_gpes();
692 }
693
694 static void acpi_power_off(void)
695 {
696         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
697         printk(KERN_DEBUG "%s called\n", __func__);
698         local_irq_disable();
699         acpi_enable_wakeup_device(ACPI_STATE_S5);
700         acpi_enter_sleep_state(ACPI_STATE_S5);
701 }
702
703 /*
704  * ACPI 2.0 created the optional _GTS and _BFS,
705  * but industry adoption has been neither rapid nor broad.
706  *
707  * Linux gets into trouble when it executes poorly validated
708  * paths through the BIOS, so disable _GTS and _BFS by default,
709  * but do speak up and offer the option to enable them.
710  */
711 void __init acpi_gts_bfs_check(void)
712 {
713         acpi_handle dummy;
714
715         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
716         {
717                 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
718                 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
719                         "please notify linux-acpi@vger.kernel.org\n");
720         }
721         if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
722         {
723                 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
724                 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
725                         "please notify linux-acpi@vger.kernel.org\n");
726         }
727 }
728
729 int __init acpi_sleep_init(void)
730 {
731         acpi_status status;
732         u8 type_a, type_b;
733 #ifdef CONFIG_SUSPEND
734         int i = 0;
735
736         dmi_check_system(acpisleep_dmi_table);
737 #endif
738
739         if (acpi_disabled)
740                 return 0;
741
742         sleep_states[ACPI_STATE_S0] = 1;
743         printk(KERN_INFO PREFIX "(supports S0");
744
745 #ifdef CONFIG_SUSPEND
746         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
747                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
748                 if (ACPI_SUCCESS(status)) {
749                         sleep_states[i] = 1;
750                         printk(" S%d", i);
751                 }
752         }
753
754         suspend_set_ops(old_suspend_ordering ?
755                 &acpi_suspend_ops_old : &acpi_suspend_ops);
756 #endif
757
758 #ifdef CONFIG_HIBERNATION
759         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
760         if (ACPI_SUCCESS(status)) {
761                 hibernation_set_ops(old_suspend_ordering ?
762                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
763                 sleep_states[ACPI_STATE_S4] = 1;
764                 printk(" S4");
765                 if (!nosigcheck) {
766                         acpi_get_table(ACPI_SIG_FACS, 1,
767                                 (struct acpi_table_header **)&facs);
768                         if (facs)
769                                 s4_hardware_signature =
770                                         facs->hardware_signature;
771                 }
772         }
773 #endif
774         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
775         if (ACPI_SUCCESS(status)) {
776                 sleep_states[ACPI_STATE_S5] = 1;
777                 printk(" S5");
778                 pm_power_off_prepare = acpi_power_off_prepare;
779                 pm_power_off = acpi_power_off;
780         }
781         printk(")\n");
782         /*
783          * Register the tts_notifier to reboot notifier list so that the _TTS
784          * object can also be evaluated when the system enters S5.
785          */
786         register_reboot_notifier(&tts_notifier);
787         acpi_gts_bfs_check();
788         return 0;
789 }