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