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 #include "sleep.h"
25
26 u8 sleep_states[ACPI_S_STATE_COUNT];
27
acpi_sleep_tts_switch(u32 acpi_state)28 static void acpi_sleep_tts_switch(u32 acpi_state)
29 {
30 union acpi_object in_arg = { ACPI_TYPE_INTEGER };
31 struct acpi_object_list arg_list = { 1, &in_arg };
32 acpi_status status = AE_OK;
33
34 in_arg.integer.value = acpi_state;
35 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
36 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
37 /*
38 * OS can't evaluate the _TTS object correctly. Some warning
39 * message will be printed. But it won't break anything.
40 */
41 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
42 }
43 }
44
tts_notify_reboot(struct notifier_block * this,unsigned long code,void * x)45 static int tts_notify_reboot(struct notifier_block *this,
46 unsigned long code, void *x)
47 {
48 acpi_sleep_tts_switch(ACPI_STATE_S5);
49 return NOTIFY_DONE;
50 }
51
52 static struct notifier_block tts_notifier = {
53 .notifier_call = tts_notify_reboot,
54 .next = NULL,
55 .priority = 0,
56 };
57
acpi_sleep_prepare(u32 acpi_state)58 static int acpi_sleep_prepare(u32 acpi_state)
59 {
60 #ifdef CONFIG_ACPI_SLEEP
61 /* do we have a wakeup address for S2 and S3? */
62 if (acpi_state == ACPI_STATE_S3) {
63 if (!acpi_wakeup_address) {
64 return -EFAULT;
65 }
66 acpi_set_firmware_waking_vector(
67 (acpi_physical_address)acpi_wakeup_address);
68
69 }
70 ACPI_FLUSH_CPU_CACHE();
71 acpi_enable_wakeup_device_prep(acpi_state);
72 #endif
73 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
74 acpi_state);
75 acpi_enter_sleep_state_prep(acpi_state);
76 return 0;
77 }
78
79 #ifdef CONFIG_ACPI_SLEEP
80 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
81 /*
82 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
83 * user to request that behavior by using the 'acpi_old_suspend_ordering'
84 * kernel command line option that causes the following variable to be set.
85 */
86 static bool old_suspend_ordering;
87
acpi_old_suspend_ordering(void)88 void __init acpi_old_suspend_ordering(void)
89 {
90 old_suspend_ordering = true;
91 }
92
93 /**
94 * acpi_pm_disable_gpes - Disable the GPEs.
95 */
acpi_pm_disable_gpes(void)96 static int acpi_pm_disable_gpes(void)
97 {
98 acpi_disable_all_gpes();
99 return 0;
100 }
101
102 /**
103 * __acpi_pm_prepare - Prepare the platform to enter the target state.
104 *
105 * If necessary, set the firmware waking vector and do arch-specific
106 * nastiness to get the wakeup code to the waking vector.
107 */
__acpi_pm_prepare(void)108 static int __acpi_pm_prepare(void)
109 {
110 int error = acpi_sleep_prepare(acpi_target_sleep_state);
111
112 if (error)
113 acpi_target_sleep_state = ACPI_STATE_S0;
114 return error;
115 }
116
117 /**
118 * acpi_pm_prepare - Prepare the platform to enter the target sleep
119 * state and disable the GPEs.
120 */
acpi_pm_prepare(void)121 static int acpi_pm_prepare(void)
122 {
123 int error = __acpi_pm_prepare();
124
125 if (!error)
126 acpi_disable_all_gpes();
127 return error;
128 }
129
130 /**
131 * acpi_pm_finish - Instruct the platform to leave a sleep state.
132 *
133 * This is called after we wake back up (or if entering the sleep state
134 * failed).
135 */
acpi_pm_finish(void)136 static void acpi_pm_finish(void)
137 {
138 u32 acpi_state = acpi_target_sleep_state;
139
140 if (acpi_state == ACPI_STATE_S0)
141 return;
142
143 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
144 acpi_state);
145 acpi_disable_wakeup_device(acpi_state);
146 acpi_leave_sleep_state(acpi_state);
147
148 /* reset firmware waking vector */
149 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
150
151 acpi_target_sleep_state = ACPI_STATE_S0;
152 }
153
154 /**
155 * acpi_pm_end - Finish up suspend sequence.
156 */
acpi_pm_end(void)157 static void acpi_pm_end(void)
158 {
159 /*
160 * This is necessary in case acpi_pm_finish() is not called during a
161 * failing transition to a sleep state.
162 */
163 acpi_target_sleep_state = ACPI_STATE_S0;
164 acpi_sleep_tts_switch(acpi_target_sleep_state);
165 }
166 #else /* !CONFIG_ACPI_SLEEP */
167 #define acpi_target_sleep_state ACPI_STATE_S0
168 #endif /* CONFIG_ACPI_SLEEP */
169
170 #ifdef CONFIG_SUSPEND
171 /*
172 * According to the ACPI specification the BIOS should make sure that ACPI is
173 * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still,
174 * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI
175 * on such systems during resume. Unfortunately that doesn't help in
176 * particularly pathological cases in which SCI_EN has to be set directly on
177 * resume, although the specification states very clearly that this flag is
178 * owned by the hardware. The set_sci_en_on_resume variable will be set in such
179 * cases.
180 */
181 static bool set_sci_en_on_resume;
182
183 extern void do_suspend_lowlevel(void);
184
185 static u32 acpi_suspend_states[] = {
186 [PM_SUSPEND_ON] = ACPI_STATE_S0,
187 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
188 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
189 [PM_SUSPEND_MAX] = ACPI_STATE_S5
190 };
191
192 /**
193 * acpi_suspend_begin - Set the target system sleep state to the state
194 * associated with given @pm_state, if supported.
195 */
acpi_suspend_begin(suspend_state_t pm_state)196 static int acpi_suspend_begin(suspend_state_t pm_state)
197 {
198 u32 acpi_state = acpi_suspend_states[pm_state];
199 int error = 0;
200
201 if (sleep_states[acpi_state]) {
202 acpi_target_sleep_state = acpi_state;
203 acpi_sleep_tts_switch(acpi_target_sleep_state);
204 } else {
205 printk(KERN_ERR "ACPI does not support this state: %d\n",
206 pm_state);
207 error = -ENOSYS;
208 }
209 return error;
210 }
211
212 /**
213 * acpi_suspend_enter - Actually enter a sleep state.
214 * @pm_state: ignored
215 *
216 * Flush caches and go to sleep. For STR we have to call arch-specific
217 * assembly, which in turn call acpi_enter_sleep_state().
218 * It's unfortunate, but it works. Please fix if you're feeling frisky.
219 */
acpi_suspend_enter(suspend_state_t pm_state)220 static int acpi_suspend_enter(suspend_state_t pm_state)
221 {
222 acpi_status status = AE_OK;
223 unsigned long flags = 0;
224 u32 acpi_state = acpi_target_sleep_state;
225
226 ACPI_FLUSH_CPU_CACHE();
227
228 /* Do arch specific saving of state. */
229 if (acpi_state == ACPI_STATE_S3) {
230 int error = acpi_save_state_mem();
231
232 if (error)
233 return error;
234 }
235
236 local_irq_save(flags);
237 acpi_enable_wakeup_device(acpi_state);
238 switch (acpi_state) {
239 case ACPI_STATE_S1:
240 barrier();
241 status = acpi_enter_sleep_state(acpi_state);
242 break;
243
244 case ACPI_STATE_S3:
245 do_suspend_lowlevel();
246 break;
247 }
248
249 /* If ACPI is not enabled by the BIOS, we need to enable it here. */
250 if (set_sci_en_on_resume)
251 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
252 else
253 acpi_enable();
254
255 /* Reprogram control registers and execute _BFS */
256 acpi_leave_sleep_state_prep(acpi_state);
257
258 /* ACPI 3.0 specs (P62) says that it's the responsibility
259 * of the OSPM to clear the status bit [ implying that the
260 * POWER_BUTTON event should not reach userspace ]
261 */
262 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
263 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
264
265 /*
266 * Disable and clear GPE status before interrupt is enabled. Some GPEs
267 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
268 * acpi_leave_sleep_state will reenable specific GPEs later
269 */
270 acpi_disable_all_gpes();
271
272 local_irq_restore(flags);
273 printk(KERN_DEBUG "Back to C!\n");
274
275 /* restore processor state */
276 if (acpi_state == ACPI_STATE_S3)
277 acpi_restore_state_mem();
278
279 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
280 }
281
acpi_suspend_state_valid(suspend_state_t pm_state)282 static int acpi_suspend_state_valid(suspend_state_t pm_state)
283 {
284 u32 acpi_state;
285
286 switch (pm_state) {
287 case PM_SUSPEND_ON:
288 case PM_SUSPEND_STANDBY:
289 case PM_SUSPEND_MEM:
290 acpi_state = acpi_suspend_states[pm_state];
291
292 return sleep_states[acpi_state];
293 default:
294 return 0;
295 }
296 }
297
298 static struct platform_suspend_ops acpi_suspend_ops = {
299 .valid = acpi_suspend_state_valid,
300 .begin = acpi_suspend_begin,
301 .prepare = acpi_pm_prepare,
302 .enter = acpi_suspend_enter,
303 .finish = acpi_pm_finish,
304 .end = acpi_pm_end,
305 };
306
307 /**
308 * acpi_suspend_begin_old - Set the target system sleep state to the
309 * state associated with given @pm_state, if supported, and
310 * execute the _PTS control method. This function is used if the
311 * pre-ACPI 2.0 suspend ordering has been requested.
312 */
acpi_suspend_begin_old(suspend_state_t pm_state)313 static int acpi_suspend_begin_old(suspend_state_t pm_state)
314 {
315 int error = acpi_suspend_begin(pm_state);
316
317 if (!error)
318 error = __acpi_pm_prepare();
319 return error;
320 }
321
322 /*
323 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
324 * been requested.
325 */
326 static struct platform_suspend_ops acpi_suspend_ops_old = {
327 .valid = acpi_suspend_state_valid,
328 .begin = acpi_suspend_begin_old,
329 .prepare = acpi_pm_disable_gpes,
330 .enter = acpi_suspend_enter,
331 .finish = acpi_pm_finish,
332 .end = acpi_pm_end,
333 .recover = acpi_pm_finish,
334 };
335
init_old_suspend_ordering(const struct dmi_system_id * d)336 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
337 {
338 old_suspend_ordering = true;
339 return 0;
340 }
341
init_set_sci_en_on_resume(const struct dmi_system_id * d)342 static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d)
343 {
344 set_sci_en_on_resume = true;
345 return 0;
346 }
347
348 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
349 {
350 .callback = init_old_suspend_ordering,
351 .ident = "Abit KN9 (nForce4 variant)",
352 .matches = {
353 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
354 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
355 },
356 },
357 {
358 .callback = init_old_suspend_ordering,
359 .ident = "HP xw4600 Workstation",
360 .matches = {
361 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
362 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
363 },
364 },
365 {
366 .callback = init_set_sci_en_on_resume,
367 .ident = "Apple MacBook 1,1",
368 .matches = {
369 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
370 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
371 },
372 },
373 {
374 .callback = init_set_sci_en_on_resume,
375 .ident = "Apple MacMini 1,1",
376 .matches = {
377 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
378 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"),
379 },
380 },
381 {
382 .callback = init_old_suspend_ordering,
383 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
384 .matches = {
385 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
386 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
387 },
388 },
389 {
390 .callback = init_set_sci_en_on_resume,
391 .ident = "Toshiba Satellite L300",
392 .matches = {
393 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
394 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"),
395 },
396 },
397 {},
398 };
399 #endif /* CONFIG_SUSPEND */
400
401 #ifdef CONFIG_HIBERNATION
402 /*
403 * The ACPI specification wants us to save NVS memory regions during hibernation
404 * and to restore them during the subsequent resume. However, it is not certain
405 * if this mechanism is going to work on all machines, so we allow the user to
406 * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line
407 * option.
408 */
409 static bool s4_no_nvs;
410
acpi_s4_no_nvs(void)411 void __init acpi_s4_no_nvs(void)
412 {
413 s4_no_nvs = true;
414 }
415
416 static unsigned long s4_hardware_signature;
417 static struct acpi_table_facs *facs;
418 static bool nosigcheck;
419
acpi_no_s4_hw_signature(void)420 void __init acpi_no_s4_hw_signature(void)
421 {
422 nosigcheck = true;
423 }
424
acpi_hibernation_begin(void)425 static int acpi_hibernation_begin(void)
426 {
427 int error;
428
429 error = s4_no_nvs ? 0 : hibernate_nvs_alloc();
430 if (!error) {
431 acpi_target_sleep_state = ACPI_STATE_S4;
432 acpi_sleep_tts_switch(acpi_target_sleep_state);
433 }
434
435 return error;
436 }
437
acpi_hibernation_pre_snapshot(void)438 static int acpi_hibernation_pre_snapshot(void)
439 {
440 int error = acpi_pm_prepare();
441
442 if (!error)
443 hibernate_nvs_save();
444
445 return error;
446 }
447
acpi_hibernation_enter(void)448 static int acpi_hibernation_enter(void)
449 {
450 acpi_status status = AE_OK;
451 unsigned long flags = 0;
452
453 ACPI_FLUSH_CPU_CACHE();
454
455 local_irq_save(flags);
456 acpi_enable_wakeup_device(ACPI_STATE_S4);
457 /* This shouldn't return. If it returns, we have a problem */
458 status = acpi_enter_sleep_state(ACPI_STATE_S4);
459 /* Reprogram control registers and execute _BFS */
460 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
461 local_irq_restore(flags);
462
463 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
464 }
465
acpi_hibernation_finish(void)466 static void acpi_hibernation_finish(void)
467 {
468 hibernate_nvs_free();
469 acpi_pm_finish();
470 }
471
acpi_hibernation_leave(void)472 static void acpi_hibernation_leave(void)
473 {
474 /*
475 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
476 * enable it here.
477 */
478 acpi_enable();
479 /* Reprogram control registers and execute _BFS */
480 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
481 /* Check the hardware signature */
482 if (facs && s4_hardware_signature != facs->hardware_signature) {
483 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
484 "cannot resume!\n");
485 panic("ACPI S4 hardware signature mismatch");
486 }
487 /* Restore the NVS memory area */
488 hibernate_nvs_restore();
489 }
490
acpi_pm_enable_gpes(void)491 static void acpi_pm_enable_gpes(void)
492 {
493 acpi_enable_all_runtime_gpes();
494 }
495
496 static struct platform_hibernation_ops acpi_hibernation_ops = {
497 .begin = acpi_hibernation_begin,
498 .end = acpi_pm_end,
499 .pre_snapshot = acpi_hibernation_pre_snapshot,
500 .finish = acpi_hibernation_finish,
501 .prepare = acpi_pm_prepare,
502 .enter = acpi_hibernation_enter,
503 .leave = acpi_hibernation_leave,
504 .pre_restore = acpi_pm_disable_gpes,
505 .restore_cleanup = acpi_pm_enable_gpes,
506 };
507
508 /**
509 * acpi_hibernation_begin_old - Set the target system sleep state to
510 * ACPI_STATE_S4 and execute the _PTS control method. This
511 * function is used if the pre-ACPI 2.0 suspend ordering has been
512 * requested.
513 */
acpi_hibernation_begin_old(void)514 static int acpi_hibernation_begin_old(void)
515 {
516 int error;
517 /*
518 * The _TTS object should always be evaluated before the _PTS object.
519 * When the old_suspended_ordering is true, the _PTS object is
520 * evaluated in the acpi_sleep_prepare.
521 */
522 acpi_sleep_tts_switch(ACPI_STATE_S4);
523
524 error = acpi_sleep_prepare(ACPI_STATE_S4);
525
526 if (!error) {
527 if (!s4_no_nvs)
528 error = hibernate_nvs_alloc();
529 if (!error)
530 acpi_target_sleep_state = ACPI_STATE_S4;
531 }
532 return error;
533 }
534
acpi_hibernation_pre_snapshot_old(void)535 static int acpi_hibernation_pre_snapshot_old(void)
536 {
537 int error = acpi_pm_disable_gpes();
538
539 if (!error)
540 hibernate_nvs_save();
541
542 return error;
543 }
544
545 /*
546 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
547 * been requested.
548 */
549 static struct platform_hibernation_ops acpi_hibernation_ops_old = {
550 .begin = acpi_hibernation_begin_old,
551 .end = acpi_pm_end,
552 .pre_snapshot = acpi_hibernation_pre_snapshot_old,
553 .finish = acpi_hibernation_finish,
554 .prepare = acpi_pm_disable_gpes,
555 .enter = acpi_hibernation_enter,
556 .leave = acpi_hibernation_leave,
557 .pre_restore = acpi_pm_disable_gpes,
558 .restore_cleanup = acpi_pm_enable_gpes,
559 .recover = acpi_pm_finish,
560 };
561 #endif /* CONFIG_HIBERNATION */
562
acpi_suspend(u32 acpi_state)563 int acpi_suspend(u32 acpi_state)
564 {
565 suspend_state_t states[] = {
566 [1] = PM_SUSPEND_STANDBY,
567 [3] = PM_SUSPEND_MEM,
568 [5] = PM_SUSPEND_MAX
569 };
570
571 if (acpi_state < 6 && states[acpi_state])
572 return pm_suspend(states[acpi_state]);
573 if (acpi_state == 4)
574 return hibernate();
575 return -EINVAL;
576 }
577
578 #ifdef CONFIG_PM_SLEEP
579 /**
580 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
581 * in the system sleep state given by %acpi_target_sleep_state
582 * @dev: device to examine; its driver model wakeup flags control
583 * whether it should be able to wake up the system
584 * @d_min_p: used to store the upper limit of allowed states range
585 * Return value: preferred power state of the device on success, -ENODEV on
586 * failure (ie. if there's no 'struct acpi_device' for @dev)
587 *
588 * Find the lowest power (highest number) ACPI device power state that
589 * device @dev can be in while the system is in the sleep state represented
590 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
591 * able to wake up the system from this sleep state. If @d_min_p is set,
592 * the highest power (lowest number) device power state of @dev allowed
593 * in this system sleep state is stored at the location pointed to by it.
594 *
595 * The caller must ensure that @dev is valid before using this function.
596 * The caller is also responsible for figuring out if the device is
597 * supposed to be able to wake up the system and passing this information
598 * via @wake.
599 */
600
acpi_pm_device_sleep_state(struct device * dev,int * d_min_p)601 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
602 {
603 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
604 struct acpi_device *adev;
605 char acpi_method[] = "_SxD";
606 unsigned long long d_min, d_max;
607
608 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
609 printk(KERN_DEBUG "ACPI handle has no context!\n");
610 return -ENODEV;
611 }
612
613 acpi_method[2] = '0' + acpi_target_sleep_state;
614 /*
615 * If the sleep state is S0, we will return D3, but if the device has
616 * _S0W, we will use the value from _S0W
617 */
618 d_min = ACPI_STATE_D0;
619 d_max = ACPI_STATE_D3;
620
621 /*
622 * If present, _SxD methods return the minimum D-state (highest power
623 * state) we can use for the corresponding S-states. Otherwise, the
624 * minimum D-state is D0 (ACPI 3.x).
625 *
626 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
627 * provided -- that's our fault recovery, we ignore retval.
628 */
629 if (acpi_target_sleep_state > ACPI_STATE_S0)
630 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
631
632 /*
633 * If _PRW says we can wake up the system from the target sleep state,
634 * the D-state returned by _SxD is sufficient for that (we assume a
635 * wakeup-aware driver if wake is set). Still, if _SxW exists
636 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
637 * can wake the system. _S0W may be valid, too.
638 */
639 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
640 (device_may_wakeup(dev) && adev->wakeup.state.enabled &&
641 adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
642 acpi_status status;
643
644 acpi_method[3] = 'W';
645 status = acpi_evaluate_integer(handle, acpi_method, NULL,
646 &d_max);
647 if (ACPI_FAILURE(status)) {
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
663 /**
664 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
665 * capability of given device
666 * @dev: device to handle
667 * @enable: 'true' - enable, 'false' - disable the wake-up capability
668 */
acpi_pm_device_sleep_wake(struct device * dev,bool enable)669 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
670 {
671 acpi_handle handle;
672 struct acpi_device *adev;
673
674 if (!device_may_wakeup(dev))
675 return -EINVAL;
676
677 handle = DEVICE_ACPI_HANDLE(dev);
678 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
679 printk(KERN_DEBUG "ACPI handle has no context!\n");
680 return -ENODEV;
681 }
682
683 return enable ?
684 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
685 acpi_disable_wakeup_device_power(adev);
686 }
687 #endif
688
acpi_power_off_prepare(void)689 static void acpi_power_off_prepare(void)
690 {
691 /* Prepare to power off the system */
692 acpi_sleep_prepare(ACPI_STATE_S5);
693 acpi_disable_all_gpes();
694 }
695
acpi_power_off(void)696 static void acpi_power_off(void)
697 {
698 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
699 printk(KERN_DEBUG "%s called\n", __func__);
700 local_irq_disable();
701 acpi_enable_wakeup_device(ACPI_STATE_S5);
702 acpi_enter_sleep_state(ACPI_STATE_S5);
703 }
704
acpi_sleep_init(void)705 int __init acpi_sleep_init(void)
706 {
707 acpi_status status;
708 u8 type_a, type_b;
709 #ifdef CONFIG_SUSPEND
710 int i = 0;
711
712 dmi_check_system(acpisleep_dmi_table);
713 #endif
714
715 if (acpi_disabled)
716 return 0;
717
718 sleep_states[ACPI_STATE_S0] = 1;
719 printk(KERN_INFO PREFIX "(supports S0");
720
721 #ifdef CONFIG_SUSPEND
722 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
723 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
724 if (ACPI_SUCCESS(status)) {
725 sleep_states[i] = 1;
726 printk(" S%d", i);
727 }
728 }
729
730 suspend_set_ops(old_suspend_ordering ?
731 &acpi_suspend_ops_old : &acpi_suspend_ops);
732 #endif
733
734 #ifdef CONFIG_HIBERNATION
735 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
736 if (ACPI_SUCCESS(status)) {
737 hibernation_set_ops(old_suspend_ordering ?
738 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
739 sleep_states[ACPI_STATE_S4] = 1;
740 printk(" S4");
741 if (!nosigcheck) {
742 acpi_get_table(ACPI_SIG_FACS, 1,
743 (struct acpi_table_header **)&facs);
744 if (facs)
745 s4_hardware_signature =
746 facs->hardware_signature;
747 }
748 }
749 #endif
750 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
751 if (ACPI_SUCCESS(status)) {
752 sleep_states[ACPI_STATE_S5] = 1;
753 printk(" S5");
754 pm_power_off_prepare = acpi_power_off_prepare;
755 pm_power_off = acpi_power_off;
756 }
757 printk(")\n");
758 /*
759 * Register the tts_notifier to reboot notifier list so that the _TTS
760 * object can also be evaluated when the system enters S5.
761 */
762 register_reboot_notifier(&tts_notifier);
763 return 0;
764 }
765