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 #include <linux/acpi.h>
20
21 #include <asm/io.h>
22
23 #include <acpi/acpi_bus.h>
24 #include <acpi/acpi_drivers.h>
25
26 #include "internal.h"
27 #include "sleep.h"
28
29 static u8 sleep_states[ACPI_S_STATE_COUNT];
30
acpi_sleep_tts_switch(u32 acpi_state)31 static void acpi_sleep_tts_switch(u32 acpi_state)
32 {
33 union acpi_object in_arg = { ACPI_TYPE_INTEGER };
34 struct acpi_object_list arg_list = { 1, &in_arg };
35 acpi_status status = AE_OK;
36
37 in_arg.integer.value = acpi_state;
38 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
39 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
40 /*
41 * OS can't evaluate the _TTS object correctly. Some warning
42 * message will be printed. But it won't break anything.
43 */
44 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
45 }
46 }
47
tts_notify_reboot(struct notifier_block * this,unsigned long code,void * x)48 static int tts_notify_reboot(struct notifier_block *this,
49 unsigned long code, void *x)
50 {
51 acpi_sleep_tts_switch(ACPI_STATE_S5);
52 return NOTIFY_DONE;
53 }
54
55 static struct notifier_block tts_notifier = {
56 .notifier_call = tts_notify_reboot,
57 .next = NULL,
58 .priority = 0,
59 };
60
acpi_sleep_prepare(u32 acpi_state)61 static int acpi_sleep_prepare(u32 acpi_state)
62 {
63 #ifdef CONFIG_ACPI_SLEEP
64 /* do we have a wakeup address for S2 and S3? */
65 if (acpi_state == ACPI_STATE_S3) {
66 if (!acpi_wakeup_address) {
67 return -EFAULT;
68 }
69 acpi_set_firmware_waking_vector(
70 (acpi_physical_address)acpi_wakeup_address);
71
72 }
73 ACPI_FLUSH_CPU_CACHE();
74 #endif
75 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
76 acpi_state);
77 acpi_enable_wakeup_devices(acpi_state);
78 acpi_enter_sleep_state_prep(acpi_state);
79 return 0;
80 }
81
82 #ifdef CONFIG_ACPI_SLEEP
83 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
84
85 /*
86 * The ACPI specification wants us to save NVS memory regions during hibernation
87 * and to restore them during the subsequent resume. Windows does that also for
88 * suspend to RAM. However, it is known that this mechanism does not work on
89 * all machines, so we allow the user to disable it with the help of the
90 * 'acpi_sleep=nonvs' kernel command line option.
91 */
92 static bool nvs_nosave;
93
acpi_nvs_nosave(void)94 void __init acpi_nvs_nosave(void)
95 {
96 nvs_nosave = true;
97 }
98
99 /*
100 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
101 * user to request that behavior by using the 'acpi_old_suspend_ordering'
102 * kernel command line option that causes the following variable to be set.
103 */
104 static bool old_suspend_ordering;
105
acpi_old_suspend_ordering(void)106 void __init acpi_old_suspend_ordering(void)
107 {
108 old_suspend_ordering = true;
109 }
110
111 /**
112 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
113 */
acpi_pm_freeze(void)114 static int acpi_pm_freeze(void)
115 {
116 acpi_disable_all_gpes();
117 acpi_os_wait_events_complete(NULL);
118 acpi_ec_block_transactions();
119 return 0;
120 }
121
122 /**
123 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
124 */
acpi_pm_pre_suspend(void)125 static int acpi_pm_pre_suspend(void)
126 {
127 acpi_pm_freeze();
128 return suspend_nvs_save();
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 */
__acpi_pm_prepare(void)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 */
acpi_pm_prepare(void)150 static int acpi_pm_prepare(void)
151 {
152 int error = __acpi_pm_prepare();
153 if (!error)
154 error = 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 */
acpi_pm_finish(void)165 static void acpi_pm_finish(void)
166 {
167 u32 acpi_state = acpi_target_sleep_state;
168
169 acpi_ec_unblock_transactions();
170 suspend_nvs_free();
171
172 if (acpi_state == ACPI_STATE_S0)
173 return;
174
175 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
176 acpi_state);
177 acpi_disable_wakeup_devices(acpi_state);
178 acpi_leave_sleep_state(acpi_state);
179
180 /* reset firmware waking vector */
181 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
182
183 acpi_target_sleep_state = ACPI_STATE_S0;
184 }
185
186 /**
187 * acpi_pm_end - Finish up suspend sequence.
188 */
acpi_pm_end(void)189 static void acpi_pm_end(void)
190 {
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 static u32 acpi_suspend_states[] = {
204 [PM_SUSPEND_ON] = ACPI_STATE_S0,
205 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
206 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
207 [PM_SUSPEND_MAX] = ACPI_STATE_S5
208 };
209
210 /**
211 * acpi_suspend_begin - Set the target system sleep state to the state
212 * associated with given @pm_state, if supported.
213 */
acpi_suspend_begin(suspend_state_t pm_state)214 static int acpi_suspend_begin(suspend_state_t pm_state)
215 {
216 u32 acpi_state = acpi_suspend_states[pm_state];
217 int error = 0;
218
219 error = nvs_nosave ? 0 : suspend_nvs_alloc();
220 if (error)
221 return error;
222
223 if (sleep_states[acpi_state]) {
224 acpi_target_sleep_state = acpi_state;
225 acpi_sleep_tts_switch(acpi_target_sleep_state);
226 } else {
227 printk(KERN_ERR "ACPI does not support this state: %d\n",
228 pm_state);
229 error = -ENOSYS;
230 }
231 return error;
232 }
233
234 /**
235 * acpi_suspend_enter - Actually enter a sleep state.
236 * @pm_state: ignored
237 *
238 * Flush caches and go to sleep. For STR we have to call arch-specific
239 * assembly, which in turn call acpi_enter_sleep_state().
240 * It's unfortunate, but it works. Please fix if you're feeling frisky.
241 */
acpi_suspend_enter(suspend_state_t pm_state)242 static int acpi_suspend_enter(suspend_state_t pm_state)
243 {
244 acpi_status status = AE_OK;
245 u32 acpi_state = acpi_target_sleep_state;
246 int error;
247
248 ACPI_FLUSH_CPU_CACHE();
249
250 switch (acpi_state) {
251 case ACPI_STATE_S1:
252 barrier();
253 status = acpi_enter_sleep_state(acpi_state);
254 break;
255
256 case ACPI_STATE_S3:
257 error = acpi_suspend_lowlevel();
258 if (error)
259 return error;
260 pr_info(PREFIX "Low-level resume complete\n");
261 break;
262 }
263
264 /* This violates the spec but is required for bug compatibility. */
265 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
266
267 /* Reprogram control registers and execute _BFS */
268 acpi_leave_sleep_state_prep(acpi_state);
269
270 /* ACPI 3.0 specs (P62) says that it's the responsibility
271 * of the OSPM to clear the status bit [ implying that the
272 * POWER_BUTTON event should not reach userspace ]
273 */
274 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3))
275 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
276
277 /*
278 * Disable and clear GPE status before interrupt is enabled. Some GPEs
279 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
280 * acpi_leave_sleep_state will reenable specific GPEs later
281 */
282 acpi_disable_all_gpes();
283 /* Allow EC transactions to happen. */
284 acpi_ec_unblock_transactions_early();
285
286 suspend_nvs_restore();
287
288 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
289 }
290
acpi_suspend_state_valid(suspend_state_t pm_state)291 static int acpi_suspend_state_valid(suspend_state_t pm_state)
292 {
293 u32 acpi_state;
294
295 switch (pm_state) {
296 case PM_SUSPEND_ON:
297 case PM_SUSPEND_STANDBY:
298 case PM_SUSPEND_MEM:
299 acpi_state = acpi_suspend_states[pm_state];
300
301 return sleep_states[acpi_state];
302 default:
303 return 0;
304 }
305 }
306
307 static const struct platform_suspend_ops acpi_suspend_ops = {
308 .valid = acpi_suspend_state_valid,
309 .begin = acpi_suspend_begin,
310 .prepare_late = acpi_pm_prepare,
311 .enter = acpi_suspend_enter,
312 .wake = acpi_pm_finish,
313 .end = acpi_pm_end,
314 };
315
316 /**
317 * acpi_suspend_begin_old - Set the target system sleep state to the
318 * state associated with given @pm_state, if supported, and
319 * execute the _PTS control method. This function is used if the
320 * pre-ACPI 2.0 suspend ordering has been requested.
321 */
acpi_suspend_begin_old(suspend_state_t pm_state)322 static int acpi_suspend_begin_old(suspend_state_t pm_state)
323 {
324 int error = acpi_suspend_begin(pm_state);
325 if (!error)
326 error = __acpi_pm_prepare();
327
328 return error;
329 }
330
331 /*
332 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
333 * been requested.
334 */
335 static const struct platform_suspend_ops acpi_suspend_ops_old = {
336 .valid = acpi_suspend_state_valid,
337 .begin = acpi_suspend_begin_old,
338 .prepare_late = acpi_pm_pre_suspend,
339 .enter = acpi_suspend_enter,
340 .wake = acpi_pm_finish,
341 .end = acpi_pm_end,
342 .recover = acpi_pm_finish,
343 };
344
init_old_suspend_ordering(const struct dmi_system_id * d)345 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
346 {
347 old_suspend_ordering = true;
348 return 0;
349 }
350
init_nvs_nosave(const struct dmi_system_id * d)351 static int __init init_nvs_nosave(const struct dmi_system_id *d)
352 {
353 acpi_nvs_nosave();
354 return 0;
355 }
356
357 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
358 {
359 .callback = init_old_suspend_ordering,
360 .ident = "Abit KN9 (nForce4 variant)",
361 .matches = {
362 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
363 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
364 },
365 },
366 {
367 .callback = init_old_suspend_ordering,
368 .ident = "HP xw4600 Workstation",
369 .matches = {
370 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
371 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
372 },
373 },
374 {
375 .callback = init_old_suspend_ordering,
376 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
377 .matches = {
378 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
379 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
380 },
381 },
382 {
383 .callback = init_old_suspend_ordering,
384 .ident = "Panasonic CF51-2L",
385 .matches = {
386 DMI_MATCH(DMI_BOARD_VENDOR,
387 "Matsushita Electric Industrial Co.,Ltd."),
388 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
389 },
390 },
391 {
392 .callback = init_nvs_nosave,
393 .ident = "Sony Vaio VGN-SR11M",
394 .matches = {
395 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
396 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
397 },
398 },
399 {
400 .callback = init_nvs_nosave,
401 .ident = "Everex StepNote Series",
402 .matches = {
403 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
404 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
405 },
406 },
407 {
408 .callback = init_nvs_nosave,
409 .ident = "Sony Vaio VPCEB1Z1E",
410 .matches = {
411 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
412 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
413 },
414 },
415 {
416 .callback = init_nvs_nosave,
417 .ident = "Sony Vaio VGN-NW130D",
418 .matches = {
419 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
420 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
421 },
422 },
423 {
424 .callback = init_nvs_nosave,
425 .ident = "Averatec AV1020-ED2",
426 .matches = {
427 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
428 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
429 },
430 },
431 {},
432 };
433 #endif /* CONFIG_SUSPEND */
434
435 #ifdef CONFIG_HIBERNATION
436 static unsigned long s4_hardware_signature;
437 static struct acpi_table_facs *facs;
438 static bool nosigcheck;
439
acpi_no_s4_hw_signature(void)440 void __init acpi_no_s4_hw_signature(void)
441 {
442 nosigcheck = true;
443 }
444
acpi_hibernation_begin(void)445 static int acpi_hibernation_begin(void)
446 {
447 int error;
448
449 error = nvs_nosave ? 0 : suspend_nvs_alloc();
450 if (!error) {
451 acpi_target_sleep_state = ACPI_STATE_S4;
452 acpi_sleep_tts_switch(acpi_target_sleep_state);
453 }
454
455 return error;
456 }
457
acpi_hibernation_enter(void)458 static int acpi_hibernation_enter(void)
459 {
460 acpi_status status = AE_OK;
461
462 ACPI_FLUSH_CPU_CACHE();
463
464 /* This shouldn't return. If it returns, we have a problem */
465 status = acpi_enter_sleep_state(ACPI_STATE_S4);
466 /* Reprogram control registers and execute _BFS */
467 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
468
469 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
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 suspend_nvs_restore();
489 /* Allow EC transactions to happen. */
490 acpi_ec_unblock_transactions_early();
491 }
492
acpi_pm_thaw(void)493 static void acpi_pm_thaw(void)
494 {
495 acpi_ec_unblock_transactions();
496 acpi_enable_all_runtime_gpes();
497 }
498
499 static const struct platform_hibernation_ops acpi_hibernation_ops = {
500 .begin = acpi_hibernation_begin,
501 .end = acpi_pm_end,
502 .pre_snapshot = acpi_pm_prepare,
503 .finish = acpi_pm_finish,
504 .prepare = acpi_pm_prepare,
505 .enter = acpi_hibernation_enter,
506 .leave = acpi_hibernation_leave,
507 .pre_restore = acpi_pm_freeze,
508 .restore_cleanup = acpi_pm_thaw,
509 };
510
511 /**
512 * acpi_hibernation_begin_old - Set the target system sleep state to
513 * ACPI_STATE_S4 and execute the _PTS control method. This
514 * function is used if the pre-ACPI 2.0 suspend ordering has been
515 * requested.
516 */
acpi_hibernation_begin_old(void)517 static int acpi_hibernation_begin_old(void)
518 {
519 int error;
520 /*
521 * The _TTS object should always be evaluated before the _PTS object.
522 * When the old_suspended_ordering is true, the _PTS object is
523 * evaluated in the acpi_sleep_prepare.
524 */
525 acpi_sleep_tts_switch(ACPI_STATE_S4);
526
527 error = acpi_sleep_prepare(ACPI_STATE_S4);
528
529 if (!error) {
530 if (!nvs_nosave)
531 error = suspend_nvs_alloc();
532 if (!error)
533 acpi_target_sleep_state = ACPI_STATE_S4;
534 }
535 return error;
536 }
537
538 /*
539 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
540 * been requested.
541 */
542 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
543 .begin = acpi_hibernation_begin_old,
544 .end = acpi_pm_end,
545 .pre_snapshot = acpi_pm_pre_suspend,
546 .prepare = acpi_pm_freeze,
547 .finish = acpi_pm_finish,
548 .enter = acpi_hibernation_enter,
549 .leave = acpi_hibernation_leave,
550 .pre_restore = acpi_pm_freeze,
551 .restore_cleanup = acpi_pm_thaw,
552 .recover = acpi_pm_finish,
553 };
554 #endif /* CONFIG_HIBERNATION */
555
acpi_suspend(u32 acpi_state)556 int acpi_suspend(u32 acpi_state)
557 {
558 suspend_state_t states[] = {
559 [1] = PM_SUSPEND_STANDBY,
560 [3] = PM_SUSPEND_MEM,
561 [5] = PM_SUSPEND_MAX
562 };
563
564 if (acpi_state < 6 && states[acpi_state])
565 return pm_suspend(states[acpi_state]);
566 if (acpi_state == 4)
567 return hibernate();
568 return -EINVAL;
569 }
570
571 #ifdef CONFIG_PM
572 /**
573 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
574 * in the system sleep state given by %acpi_target_sleep_state
575 * @dev: device to examine; its driver model wakeup flags control
576 * whether it should be able to wake up the system
577 * @d_min_p: used to store the upper limit of allowed states range
578 * Return value: preferred power state of the device on success, -ENODEV on
579 * failure (ie. if there's no 'struct acpi_device' for @dev)
580 *
581 * Find the lowest power (highest number) ACPI device power state that
582 * device @dev can be in while the system is in the sleep state represented
583 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
584 * able to wake up the system from this sleep state. If @d_min_p is set,
585 * the highest power (lowest number) device power state of @dev allowed
586 * in this system sleep state is stored at the location pointed to by it.
587 *
588 * The caller must ensure that @dev is valid before using this function.
589 * The caller is also responsible for figuring out if the device is
590 * supposed to be able to wake up the system and passing this information
591 * via @wake.
592 */
593
acpi_pm_device_sleep_state(struct device * dev,int * d_min_p)594 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
595 {
596 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
597 struct acpi_device *adev;
598 char acpi_method[] = "_SxD";
599 unsigned long long d_min, d_max;
600
601 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
602 printk(KERN_DEBUG "ACPI handle has no context!\n");
603 return -ENODEV;
604 }
605
606 acpi_method[2] = '0' + acpi_target_sleep_state;
607 /*
608 * If the sleep state is S0, we will return D3, but if the device has
609 * _S0W, we will use the value from _S0W
610 */
611 d_min = ACPI_STATE_D0;
612 d_max = ACPI_STATE_D3;
613
614 /*
615 * If present, _SxD methods return the minimum D-state (highest power
616 * state) we can use for the corresponding S-states. Otherwise, the
617 * minimum D-state is D0 (ACPI 3.x).
618 *
619 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
620 * provided -- that's our fault recovery, we ignore retval.
621 */
622 if (acpi_target_sleep_state > ACPI_STATE_S0)
623 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
624
625 /*
626 * If _PRW says we can wake up the system from the target sleep state,
627 * the D-state returned by _SxD is sufficient for that (we assume a
628 * wakeup-aware driver if wake is set). Still, if _SxW exists
629 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
630 * can wake the system. _S0W may be valid, too.
631 */
632 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
633 (device_may_wakeup(dev) &&
634 adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
635 acpi_status status;
636
637 acpi_method[3] = 'W';
638 status = acpi_evaluate_integer(handle, acpi_method, NULL,
639 &d_max);
640 if (ACPI_FAILURE(status)) {
641 if (acpi_target_sleep_state != ACPI_STATE_S0 ||
642 status != AE_NOT_FOUND)
643 d_max = d_min;
644 } else if (d_max < d_min) {
645 /* Warn the user of the broken DSDT */
646 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
647 acpi_method);
648 /* Sanitize it */
649 d_min = d_max;
650 }
651 }
652
653 if (d_min_p)
654 *d_min_p = d_min;
655 return d_max;
656 }
657 #endif /* CONFIG_PM */
658
659 #ifdef CONFIG_PM_SLEEP
660 /**
661 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
662 * capability of given device
663 * @dev: device to handle
664 * @enable: 'true' - enable, 'false' - disable the wake-up capability
665 */
acpi_pm_device_sleep_wake(struct device * dev,bool enable)666 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
667 {
668 acpi_handle handle;
669 struct acpi_device *adev;
670 int error;
671
672 if (!device_can_wakeup(dev))
673 return -EINVAL;
674
675 handle = DEVICE_ACPI_HANDLE(dev);
676 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
677 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
678 return -ENODEV;
679 }
680
681 error = enable ?
682 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
683 acpi_disable_wakeup_device_power(adev);
684 if (!error)
685 dev_info(dev, "wake-up capability %s by ACPI\n",
686 enable ? "enabled" : "disabled");
687
688 return error;
689 }
690 #endif /* CONFIG_PM_SLEEP */
691
acpi_power_off_prepare(void)692 static void acpi_power_off_prepare(void)
693 {
694 /* Prepare to power off the system */
695 acpi_sleep_prepare(ACPI_STATE_S5);
696 acpi_disable_all_gpes();
697 }
698
acpi_power_off(void)699 static void acpi_power_off(void)
700 {
701 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
702 printk(KERN_DEBUG "%s called\n", __func__);
703 local_irq_disable();
704 acpi_enter_sleep_state(ACPI_STATE_S5);
705 }
706
707 /*
708 * ACPI 2.0 created the optional _GTS and _BFS,
709 * but industry adoption has been neither rapid nor broad.
710 *
711 * Linux gets into trouble when it executes poorly validated
712 * paths through the BIOS, so disable _GTS and _BFS by default,
713 * but do speak up and offer the option to enable them.
714 */
acpi_gts_bfs_check(void)715 static void __init acpi_gts_bfs_check(void)
716 {
717 acpi_handle dummy;
718
719 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
720 {
721 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
722 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
723 "please notify linux-acpi@vger.kernel.org\n");
724 }
725 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
726 {
727 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
728 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
729 "please notify linux-acpi@vger.kernel.org\n");
730 }
731 }
732
acpi_sleep_init(void)733 int __init acpi_sleep_init(void)
734 {
735 acpi_status status;
736 u8 type_a, type_b;
737 #ifdef CONFIG_SUSPEND
738 int i = 0;
739
740 dmi_check_system(acpisleep_dmi_table);
741 #endif
742
743 if (acpi_disabled)
744 return 0;
745
746 sleep_states[ACPI_STATE_S0] = 1;
747 printk(KERN_INFO PREFIX "(supports S0");
748
749 #ifdef CONFIG_SUSPEND
750 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
751 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
752 if (ACPI_SUCCESS(status)) {
753 sleep_states[i] = 1;
754 printk(" S%d", i);
755 }
756 }
757
758 suspend_set_ops(old_suspend_ordering ?
759 &acpi_suspend_ops_old : &acpi_suspend_ops);
760 #endif
761
762 #ifdef CONFIG_HIBERNATION
763 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
764 if (ACPI_SUCCESS(status)) {
765 hibernation_set_ops(old_suspend_ordering ?
766 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
767 sleep_states[ACPI_STATE_S4] = 1;
768 printk(" S4");
769 if (!nosigcheck) {
770 acpi_get_table(ACPI_SIG_FACS, 1,
771 (struct acpi_table_header **)&facs);
772 if (facs)
773 s4_hardware_signature =
774 facs->hardware_signature;
775 }
776 }
777 #endif
778 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
779 if (ACPI_SUCCESS(status)) {
780 sleep_states[ACPI_STATE_S5] = 1;
781 printk(" S5");
782 pm_power_off_prepare = acpi_power_off_prepare;
783 pm_power_off = acpi_power_off;
784 }
785 printk(")\n");
786 /*
787 * Register the tts_notifier to reboot notifier list so that the _TTS
788 * object can also be evaluated when the system enters S5.
789 */
790 register_reboot_notifier(&tts_notifier);
791 acpi_gts_bfs_check();
792 return 0;
793 }
794