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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#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
29static u8 sleep_states[ACPI_S_STATE_COUNT];
30
31static 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
48static 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
55static struct notifier_block tts_notifier = {
56 .notifier_call = tts_notify_reboot,
57 .next = NULL,
58 .priority = 0,
59};
60
61static 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
83static 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 */
92static bool nvs_nosave;
93
94void __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 */
104static bool old_suspend_ordering;
105
106void __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 */
114static 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 */
125static 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 */
137static 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 */
150static 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 */
165static 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 */
189static 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
203static 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 */
214static 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 */
242static 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
291static 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
307static 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 */
322static 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 */
335static 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
345static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
346{
347 old_suspend_ordering = true;
348 return 0;
349}
350
351static int __init init_nvs_nosave(const struct dmi_system_id *d)
352{
353 acpi_nvs_nosave();
354 return 0;
355}
356
357static 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 .callback = init_old_suspend_ordering,
433 .ident = "Asus A8N-SLI DELUXE",
434 .matches = {
435 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
436 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
437 },
438 },
439 {
440 .callback = init_old_suspend_ordering,
441 .ident = "Asus A8N-SLI Premium",
442 .matches = {
443 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
444 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
445 },
446 },
447 {},
448};
449#endif /* CONFIG_SUSPEND */
450
451#ifdef CONFIG_HIBERNATION
452static unsigned long s4_hardware_signature;
453static struct acpi_table_facs *facs;
454static bool nosigcheck;
455
456void __init acpi_no_s4_hw_signature(void)
457{
458 nosigcheck = true;
459}
460
461static int acpi_hibernation_begin(void)
462{
463 int error;
464
465 error = nvs_nosave ? 0 : suspend_nvs_alloc();
466 if (!error) {
467 acpi_target_sleep_state = ACPI_STATE_S4;
468 acpi_sleep_tts_switch(acpi_target_sleep_state);
469 }
470
471 return error;
472}
473
474static int acpi_hibernation_enter(void)
475{
476 acpi_status status = AE_OK;
477
478 ACPI_FLUSH_CPU_CACHE();
479
480 /* This shouldn't return. If it returns, we have a problem */
481 status = acpi_enter_sleep_state(ACPI_STATE_S4);
482 /* Reprogram control registers and execute _BFS */
483 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
484
485 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
486}
487
488static void acpi_hibernation_leave(void)
489{
490 /*
491 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
492 * enable it here.
493 */
494 acpi_enable();
495 /* Reprogram control registers and execute _BFS */
496 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
497 /* Check the hardware signature */
498 if (facs && s4_hardware_signature != facs->hardware_signature) {
499 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
500 "cannot resume!\n");
501 panic("ACPI S4 hardware signature mismatch");
502 }
503 /* Restore the NVS memory area */
504 suspend_nvs_restore();
505 /* Allow EC transactions to happen. */
506 acpi_ec_unblock_transactions_early();
507}
508
509static void acpi_pm_thaw(void)
510{
511 acpi_ec_unblock_transactions();
512 acpi_enable_all_runtime_gpes();
513}
514
515static const struct platform_hibernation_ops acpi_hibernation_ops = {
516 .begin = acpi_hibernation_begin,
517 .end = acpi_pm_end,
518 .pre_snapshot = acpi_pm_prepare,
519 .finish = acpi_pm_finish,
520 .prepare = acpi_pm_prepare,
521 .enter = acpi_hibernation_enter,
522 .leave = acpi_hibernation_leave,
523 .pre_restore = acpi_pm_freeze,
524 .restore_cleanup = acpi_pm_thaw,
525};
526
527/**
528 * acpi_hibernation_begin_old - Set the target system sleep state to
529 * ACPI_STATE_S4 and execute the _PTS control method. This
530 * function is used if the pre-ACPI 2.0 suspend ordering has been
531 * requested.
532 */
533static int acpi_hibernation_begin_old(void)
534{
535 int error;
536 /*
537 * The _TTS object should always be evaluated before the _PTS object.
538 * When the old_suspended_ordering is true, the _PTS object is
539 * evaluated in the acpi_sleep_prepare.
540 */
541 acpi_sleep_tts_switch(ACPI_STATE_S4);
542
543 error = acpi_sleep_prepare(ACPI_STATE_S4);
544
545 if (!error) {
546 if (!nvs_nosave)
547 error = suspend_nvs_alloc();
548 if (!error)
549 acpi_target_sleep_state = ACPI_STATE_S4;
550 }
551 return error;
552}
553
554/*
555 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
556 * been requested.
557 */
558static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
559 .begin = acpi_hibernation_begin_old,
560 .end = acpi_pm_end,
561 .pre_snapshot = acpi_pm_pre_suspend,
562 .prepare = acpi_pm_freeze,
563 .finish = acpi_pm_finish,
564 .enter = acpi_hibernation_enter,
565 .leave = acpi_hibernation_leave,
566 .pre_restore = acpi_pm_freeze,
567 .restore_cleanup = acpi_pm_thaw,
568 .recover = acpi_pm_finish,
569};
570#endif /* CONFIG_HIBERNATION */
571
572int acpi_suspend(u32 acpi_state)
573{
574 suspend_state_t states[] = {
575 [1] = PM_SUSPEND_STANDBY,
576 [3] = PM_SUSPEND_MEM,
577 [5] = PM_SUSPEND_MAX
578 };
579
580 if (acpi_state < 6 && states[acpi_state])
581 return pm_suspend(states[acpi_state]);
582 if (acpi_state == 4)
583 return hibernate();
584 return -EINVAL;
585}
586
587#ifdef CONFIG_PM
588/**
589 * acpi_pm_device_sleep_state - return preferred power state of ACPI device
590 * in the system sleep state given by %acpi_target_sleep_state
591 * @dev: device to examine; its driver model wakeup flags control
592 * whether it should be able to wake up the system
593 * @d_min_p: used to store the upper limit of allowed states range
594 * Return value: preferred power state of the device on success, -ENODEV on
595 * failure (ie. if there's no 'struct acpi_device' for @dev)
596 *
597 * Find the lowest power (highest number) ACPI device power state that
598 * device @dev can be in while the system is in the sleep state represented
599 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be
600 * able to wake up the system from this sleep state. If @d_min_p is set,
601 * the highest power (lowest number) device power state of @dev allowed
602 * in this system sleep state is stored at the location pointed to by it.
603 *
604 * The caller must ensure that @dev is valid before using this function.
605 * The caller is also responsible for figuring out if the device is
606 * supposed to be able to wake up the system and passing this information
607 * via @wake.
608 */
609
610int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p)
611{
612 acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
613 struct acpi_device *adev;
614 char acpi_method[] = "_SxD";
615 unsigned long long d_min, d_max;
616
617 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
618 printk(KERN_DEBUG "ACPI handle has no context!\n");
619 return -ENODEV;
620 }
621
622 acpi_method[2] = '0' + acpi_target_sleep_state;
623 /*
624 * If the sleep state is S0, we will return D3, but if the device has
625 * _S0W, we will use the value from _S0W
626 */
627 d_min = ACPI_STATE_D0;
628 d_max = ACPI_STATE_D3;
629
630 /*
631 * If present, _SxD methods return the minimum D-state (highest power
632 * state) we can use for the corresponding S-states. Otherwise, the
633 * minimum D-state is D0 (ACPI 3.x).
634 *
635 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
636 * provided -- that's our fault recovery, we ignore retval.
637 */
638 if (acpi_target_sleep_state > ACPI_STATE_S0)
639 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
640
641 /*
642 * If _PRW says we can wake up the system from the target sleep state,
643 * the D-state returned by _SxD is sufficient for that (we assume a
644 * wakeup-aware driver if wake is set). Still, if _SxW exists
645 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
646 * can wake the system. _S0W may be valid, too.
647 */
648 if (acpi_target_sleep_state == ACPI_STATE_S0 ||
649 (device_may_wakeup(dev) &&
650 adev->wakeup.sleep_state <= acpi_target_sleep_state)) {
651 acpi_status status;
652
653 acpi_method[3] = 'W';
654 status = acpi_evaluate_integer(handle, acpi_method, NULL,
655 &d_max);
656 if (ACPI_FAILURE(status)) {
657 if (acpi_target_sleep_state != ACPI_STATE_S0 ||
658 status != AE_NOT_FOUND)
659 d_max = d_min;
660 } else if (d_max < d_min) {
661 /* Warn the user of the broken DSDT */
662 printk(KERN_WARNING "ACPI: Wrong value from %s\n",
663 acpi_method);
664 /* Sanitize it */
665 d_min = d_max;
666 }
667 }
668
669 if (d_min_p)
670 *d_min_p = d_min;
671 return d_max;
672}
673#endif /* CONFIG_PM */
674
675#ifdef CONFIG_PM_SLEEP
676/**
677 * acpi_pm_device_sleep_wake - enable or disable the system wake-up
678 * capability of given device
679 * @dev: device to handle
680 * @enable: 'true' - enable, 'false' - disable the wake-up capability
681 */
682int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
683{
684 acpi_handle handle;
685 struct acpi_device *adev;
686 int error;
687
688 if (!device_can_wakeup(dev))
689 return -EINVAL;
690
691 handle = DEVICE_ACPI_HANDLE(dev);
692 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
693 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
694 return -ENODEV;
695 }
696
697 error = enable ?
698 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
699 acpi_disable_wakeup_device_power(adev);
700 if (!error)
701 dev_info(dev, "wake-up capability %s by ACPI\n",
702 enable ? "enabled" : "disabled");
703
704 return error;
705}
706#endif /* CONFIG_PM_SLEEP */
707
708static void acpi_power_off_prepare(void)
709{
710 /* Prepare to power off the system */
711 acpi_sleep_prepare(ACPI_STATE_S5);
712 acpi_disable_all_gpes();
713}
714
715static void acpi_power_off(void)
716{
717 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
718 printk(KERN_DEBUG "%s called\n", __func__);
719 local_irq_disable();
720 acpi_enter_sleep_state(ACPI_STATE_S5);
721}
722
723/*
724 * ACPI 2.0 created the optional _GTS and _BFS,
725 * but industry adoption has been neither rapid nor broad.
726 *
727 * Linux gets into trouble when it executes poorly validated
728 * paths through the BIOS, so disable _GTS and _BFS by default,
729 * but do speak up and offer the option to enable them.
730 */
731static void __init acpi_gts_bfs_check(void)
732{
733 acpi_handle dummy;
734
735 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy)))
736 {
737 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n");
738 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, "
739 "please notify linux-acpi@vger.kernel.org\n");
740 }
741 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy)))
742 {
743 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n");
744 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, "
745 "please notify linux-acpi@vger.kernel.org\n");
746 }
747}
748
749int __init acpi_sleep_init(void)
750{
751 acpi_status status;
752 u8 type_a, type_b;
753#ifdef CONFIG_SUSPEND
754 int i = 0;
755
756 dmi_check_system(acpisleep_dmi_table);
757#endif
758
759 if (acpi_disabled)
760 return 0;
761
762 sleep_states[ACPI_STATE_S0] = 1;
763 printk(KERN_INFO PREFIX "(supports S0");
764
765#ifdef CONFIG_SUSPEND
766 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
767 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
768 if (ACPI_SUCCESS(status)) {
769 sleep_states[i] = 1;
770 printk(" S%d", i);
771 }
772 }
773
774 suspend_set_ops(old_suspend_ordering ?
775 &acpi_suspend_ops_old : &acpi_suspend_ops);
776#endif
777
778#ifdef CONFIG_HIBERNATION
779 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
780 if (ACPI_SUCCESS(status)) {
781 hibernation_set_ops(old_suspend_ordering ?
782 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
783 sleep_states[ACPI_STATE_S4] = 1;
784 printk(" S4");
785 if (!nosigcheck) {
786 acpi_get_table(ACPI_SIG_FACS, 1,
787 (struct acpi_table_header **)&facs);
788 if (facs)
789 s4_hardware_signature =
790 facs->hardware_signature;
791 }
792 }
793#endif
794 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
795 if (ACPI_SUCCESS(status)) {
796 sleep_states[ACPI_STATE_S5] = 1;
797 printk(" S5");
798 pm_power_off_prepare = acpi_power_off_prepare;
799 pm_power_off = acpi_power_off;
800 }
801 printk(")\n");
802 /*
803 * Register the tts_notifier to reboot notifier list so that the _TTS
804 * object can also be evaluated when the system enters S5.
805 */
806 register_reboot_notifier(&tts_notifier);
807 acpi_gts_bfs_check();
808 return 0;
809}
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#include <linux/module.h>
21#include <asm/io.h>
22
23#include "internal.h"
24#include "sleep.h"
25
26static u8 sleep_states[ACPI_S_STATE_COUNT];
27
28static void acpi_sleep_tts_switch(u32 acpi_state)
29{
30 acpi_status status;
31
32 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
33 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
34 /*
35 * OS can't evaluate the _TTS object correctly. Some warning
36 * message will be printed. But it won't break anything.
37 */
38 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
39 }
40}
41
42static int tts_notify_reboot(struct notifier_block *this,
43 unsigned long code, void *x)
44{
45 acpi_sleep_tts_switch(ACPI_STATE_S5);
46 return NOTIFY_DONE;
47}
48
49static struct notifier_block tts_notifier = {
50 .notifier_call = tts_notify_reboot,
51 .next = NULL,
52 .priority = 0,
53};
54
55static int acpi_sleep_prepare(u32 acpi_state)
56{
57#ifdef CONFIG_ACPI_SLEEP
58 /* do we have a wakeup address for S2 and S3? */
59 if (acpi_state == ACPI_STATE_S3) {
60 if (!acpi_wakeup_address)
61 return -EFAULT;
62 acpi_set_firmware_waking_vector(acpi_wakeup_address);
63
64 }
65 ACPI_FLUSH_CPU_CACHE();
66#endif
67 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
68 acpi_state);
69 acpi_enable_wakeup_devices(acpi_state);
70 acpi_enter_sleep_state_prep(acpi_state);
71 return 0;
72}
73
74static bool acpi_sleep_state_supported(u8 sleep_state)
75{
76 acpi_status status;
77 u8 type_a, type_b;
78
79 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
80 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
81 || (acpi_gbl_FADT.sleep_control.address
82 && acpi_gbl_FADT.sleep_status.address));
83}
84
85#ifdef CONFIG_ACPI_SLEEP
86static u32 acpi_target_sleep_state = ACPI_STATE_S0;
87
88u32 acpi_target_system_state(void)
89{
90 return acpi_target_sleep_state;
91}
92
93static bool pwr_btn_event_pending;
94
95/*
96 * The ACPI specification wants us to save NVS memory regions during hibernation
97 * and to restore them during the subsequent resume. Windows does that also for
98 * suspend to RAM. However, it is known that this mechanism does not work on
99 * all machines, so we allow the user to disable it with the help of the
100 * 'acpi_sleep=nonvs' kernel command line option.
101 */
102static bool nvs_nosave;
103
104void __init acpi_nvs_nosave(void)
105{
106 nvs_nosave = true;
107}
108
109/*
110 * The ACPI specification wants us to save NVS memory regions during hibernation
111 * but says nothing about saving NVS during S3. Not all versions of Windows
112 * save NVS on S3 suspend either, and it is clear that not all systems need
113 * NVS to be saved at S3 time. To improve suspend/resume time, allow the
114 * user to disable saving NVS on S3 if their system does not require it, but
115 * continue to save/restore NVS for S4 as specified.
116 */
117static bool nvs_nosave_s3;
118
119void __init acpi_nvs_nosave_s3(void)
120{
121 nvs_nosave_s3 = true;
122}
123
124/*
125 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
126 * user to request that behavior by using the 'acpi_old_suspend_ordering'
127 * kernel command line option that causes the following variable to be set.
128 */
129static bool old_suspend_ordering;
130
131void __init acpi_old_suspend_ordering(void)
132{
133 old_suspend_ordering = true;
134}
135
136static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
137{
138 acpi_old_suspend_ordering();
139 return 0;
140}
141
142static int __init init_nvs_nosave(const struct dmi_system_id *d)
143{
144 acpi_nvs_nosave();
145 return 0;
146}
147
148static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
149 {
150 .callback = init_old_suspend_ordering,
151 .ident = "Abit KN9 (nForce4 variant)",
152 .matches = {
153 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
154 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
155 },
156 },
157 {
158 .callback = init_old_suspend_ordering,
159 .ident = "HP xw4600 Workstation",
160 .matches = {
161 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
162 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
163 },
164 },
165 {
166 .callback = init_old_suspend_ordering,
167 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
168 .matches = {
169 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
170 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
171 },
172 },
173 {
174 .callback = init_old_suspend_ordering,
175 .ident = "Panasonic CF51-2L",
176 .matches = {
177 DMI_MATCH(DMI_BOARD_VENDOR,
178 "Matsushita Electric Industrial Co.,Ltd."),
179 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
180 },
181 },
182 {
183 .callback = init_nvs_nosave,
184 .ident = "Sony Vaio VGN-FW41E_H",
185 .matches = {
186 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
187 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
188 },
189 },
190 {
191 .callback = init_nvs_nosave,
192 .ident = "Sony Vaio VGN-FW21E",
193 .matches = {
194 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
195 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
196 },
197 },
198 {
199 .callback = init_nvs_nosave,
200 .ident = "Sony Vaio VGN-FW21M",
201 .matches = {
202 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
203 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
204 },
205 },
206 {
207 .callback = init_nvs_nosave,
208 .ident = "Sony Vaio VPCEB17FX",
209 .matches = {
210 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
211 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
212 },
213 },
214 {
215 .callback = init_nvs_nosave,
216 .ident = "Sony Vaio VGN-SR11M",
217 .matches = {
218 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
219 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
220 },
221 },
222 {
223 .callback = init_nvs_nosave,
224 .ident = "Everex StepNote Series",
225 .matches = {
226 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
227 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
228 },
229 },
230 {
231 .callback = init_nvs_nosave,
232 .ident = "Sony Vaio VPCEB1Z1E",
233 .matches = {
234 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
235 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
236 },
237 },
238 {
239 .callback = init_nvs_nosave,
240 .ident = "Sony Vaio VGN-NW130D",
241 .matches = {
242 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
243 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
244 },
245 },
246 {
247 .callback = init_nvs_nosave,
248 .ident = "Sony Vaio VPCCW29FX",
249 .matches = {
250 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
251 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
252 },
253 },
254 {
255 .callback = init_nvs_nosave,
256 .ident = "Averatec AV1020-ED2",
257 .matches = {
258 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
259 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
260 },
261 },
262 {
263 .callback = init_old_suspend_ordering,
264 .ident = "Asus A8N-SLI DELUXE",
265 .matches = {
266 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
267 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
268 },
269 },
270 {
271 .callback = init_old_suspend_ordering,
272 .ident = "Asus A8N-SLI Premium",
273 .matches = {
274 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
275 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
276 },
277 },
278 {
279 .callback = init_nvs_nosave,
280 .ident = "Sony Vaio VGN-SR26GN_P",
281 .matches = {
282 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
283 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
284 },
285 },
286 {
287 .callback = init_nvs_nosave,
288 .ident = "Sony Vaio VPCEB1S1E",
289 .matches = {
290 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
291 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
292 },
293 },
294 {
295 .callback = init_nvs_nosave,
296 .ident = "Sony Vaio VGN-FW520F",
297 .matches = {
298 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
299 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
300 },
301 },
302 {
303 .callback = init_nvs_nosave,
304 .ident = "Asus K54C",
305 .matches = {
306 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
307 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
308 },
309 },
310 {
311 .callback = init_nvs_nosave,
312 .ident = "Asus K54HR",
313 .matches = {
314 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
315 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
316 },
317 },
318 {},
319};
320
321static void acpi_sleep_dmi_check(void)
322{
323 dmi_check_system(acpisleep_dmi_table);
324}
325
326/**
327 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
328 */
329static int acpi_pm_freeze(void)
330{
331 acpi_disable_all_gpes();
332 acpi_os_wait_events_complete();
333 acpi_ec_block_transactions();
334 return 0;
335}
336
337/**
338 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
339 */
340static int acpi_pm_pre_suspend(void)
341{
342 acpi_pm_freeze();
343 return suspend_nvs_save();
344}
345
346/**
347 * __acpi_pm_prepare - Prepare the platform to enter the target state.
348 *
349 * If necessary, set the firmware waking vector and do arch-specific
350 * nastiness to get the wakeup code to the waking vector.
351 */
352static int __acpi_pm_prepare(void)
353{
354 int error = acpi_sleep_prepare(acpi_target_sleep_state);
355 if (error)
356 acpi_target_sleep_state = ACPI_STATE_S0;
357
358 return error;
359}
360
361/**
362 * acpi_pm_prepare - Prepare the platform to enter the target sleep
363 * state and disable the GPEs.
364 */
365static int acpi_pm_prepare(void)
366{
367 int error = __acpi_pm_prepare();
368 if (!error)
369 error = acpi_pm_pre_suspend();
370
371 return error;
372}
373
374static int find_powerf_dev(struct device *dev, void *data)
375{
376 struct acpi_device *device = to_acpi_device(dev);
377 const char *hid = acpi_device_hid(device);
378
379 return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
380}
381
382/**
383 * acpi_pm_finish - Instruct the platform to leave a sleep state.
384 *
385 * This is called after we wake back up (or if entering the sleep state
386 * failed).
387 */
388static void acpi_pm_finish(void)
389{
390 struct device *pwr_btn_dev;
391 u32 acpi_state = acpi_target_sleep_state;
392
393 acpi_ec_unblock_transactions();
394 suspend_nvs_free();
395
396 if (acpi_state == ACPI_STATE_S0)
397 return;
398
399 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
400 acpi_state);
401 acpi_disable_wakeup_devices(acpi_state);
402 acpi_leave_sleep_state(acpi_state);
403
404 /* reset firmware waking vector */
405 acpi_set_firmware_waking_vector((acpi_physical_address) 0);
406
407 acpi_target_sleep_state = ACPI_STATE_S0;
408
409 acpi_resume_power_resources();
410
411 /* If we were woken with the fixed power button, provide a small
412 * hint to userspace in the form of a wakeup event on the fixed power
413 * button device (if it can be found).
414 *
415 * We delay the event generation til now, as the PM layer requires
416 * timekeeping to be running before we generate events. */
417 if (!pwr_btn_event_pending)
418 return;
419
420 pwr_btn_event_pending = false;
421 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
422 find_powerf_dev);
423 if (pwr_btn_dev) {
424 pm_wakeup_event(pwr_btn_dev, 0);
425 put_device(pwr_btn_dev);
426 }
427}
428
429/**
430 * acpi_pm_start - Start system PM transition.
431 */
432static void acpi_pm_start(u32 acpi_state)
433{
434 acpi_target_sleep_state = acpi_state;
435 acpi_sleep_tts_switch(acpi_target_sleep_state);
436 acpi_scan_lock_acquire();
437}
438
439/**
440 * acpi_pm_end - Finish up system PM transition.
441 */
442static void acpi_pm_end(void)
443{
444 acpi_scan_lock_release();
445 /*
446 * This is necessary in case acpi_pm_finish() is not called during a
447 * failing transition to a sleep state.
448 */
449 acpi_target_sleep_state = ACPI_STATE_S0;
450 acpi_sleep_tts_switch(acpi_target_sleep_state);
451}
452#else /* !CONFIG_ACPI_SLEEP */
453#define acpi_target_sleep_state ACPI_STATE_S0
454static inline void acpi_sleep_dmi_check(void) {}
455#endif /* CONFIG_ACPI_SLEEP */
456
457#ifdef CONFIG_SUSPEND
458static u32 acpi_suspend_states[] = {
459 [PM_SUSPEND_ON] = ACPI_STATE_S0,
460 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
461 [PM_SUSPEND_MEM] = ACPI_STATE_S3,
462 [PM_SUSPEND_MAX] = ACPI_STATE_S5
463};
464
465/**
466 * acpi_suspend_begin - Set the target system sleep state to the state
467 * associated with given @pm_state, if supported.
468 */
469static int acpi_suspend_begin(suspend_state_t pm_state)
470{
471 u32 acpi_state = acpi_suspend_states[pm_state];
472 int error;
473
474 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
475 if (error)
476 return error;
477
478 if (!sleep_states[acpi_state]) {
479 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
480 return -ENOSYS;
481 }
482
483 acpi_pm_start(acpi_state);
484 return 0;
485}
486
487/**
488 * acpi_suspend_enter - Actually enter a sleep state.
489 * @pm_state: ignored
490 *
491 * Flush caches and go to sleep. For STR we have to call arch-specific
492 * assembly, which in turn call acpi_enter_sleep_state().
493 * It's unfortunate, but it works. Please fix if you're feeling frisky.
494 */
495static int acpi_suspend_enter(suspend_state_t pm_state)
496{
497 acpi_status status = AE_OK;
498 u32 acpi_state = acpi_target_sleep_state;
499 int error;
500
501 ACPI_FLUSH_CPU_CACHE();
502
503 switch (acpi_state) {
504 case ACPI_STATE_S1:
505 barrier();
506 status = acpi_enter_sleep_state(acpi_state);
507 break;
508
509 case ACPI_STATE_S3:
510 if (!acpi_suspend_lowlevel)
511 return -ENOSYS;
512 error = acpi_suspend_lowlevel();
513 if (error)
514 return error;
515 pr_info(PREFIX "Low-level resume complete\n");
516 break;
517 }
518
519 /* This violates the spec but is required for bug compatibility. */
520 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
521
522 /* Reprogram control registers */
523 acpi_leave_sleep_state_prep(acpi_state);
524
525 /* ACPI 3.0 specs (P62) says that it's the responsibility
526 * of the OSPM to clear the status bit [ implying that the
527 * POWER_BUTTON event should not reach userspace ]
528 *
529 * However, we do generate a small hint for userspace in the form of
530 * a wakeup event. We flag this condition for now and generate the
531 * event later, as we're currently too early in resume to be able to
532 * generate wakeup events.
533 */
534 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
535 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
536
537 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
538
539 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
540 acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
541 /* Flag for later */
542 pwr_btn_event_pending = true;
543 }
544 }
545
546 /*
547 * Disable and clear GPE status before interrupt is enabled. Some GPEs
548 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
549 * acpi_leave_sleep_state will reenable specific GPEs later
550 */
551 acpi_disable_all_gpes();
552 /* Allow EC transactions to happen. */
553 acpi_ec_unblock_transactions_early();
554
555 suspend_nvs_restore();
556
557 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
558}
559
560static int acpi_suspend_state_valid(suspend_state_t pm_state)
561{
562 u32 acpi_state;
563
564 switch (pm_state) {
565 case PM_SUSPEND_ON:
566 case PM_SUSPEND_STANDBY:
567 case PM_SUSPEND_MEM:
568 acpi_state = acpi_suspend_states[pm_state];
569
570 return sleep_states[acpi_state];
571 default:
572 return 0;
573 }
574}
575
576static const struct platform_suspend_ops acpi_suspend_ops = {
577 .valid = acpi_suspend_state_valid,
578 .begin = acpi_suspend_begin,
579 .prepare_late = acpi_pm_prepare,
580 .enter = acpi_suspend_enter,
581 .wake = acpi_pm_finish,
582 .end = acpi_pm_end,
583};
584
585/**
586 * acpi_suspend_begin_old - Set the target system sleep state to the
587 * state associated with given @pm_state, if supported, and
588 * execute the _PTS control method. This function is used if the
589 * pre-ACPI 2.0 suspend ordering has been requested.
590 */
591static int acpi_suspend_begin_old(suspend_state_t pm_state)
592{
593 int error = acpi_suspend_begin(pm_state);
594 if (!error)
595 error = __acpi_pm_prepare();
596
597 return error;
598}
599
600/*
601 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
602 * been requested.
603 */
604static const struct platform_suspend_ops acpi_suspend_ops_old = {
605 .valid = acpi_suspend_state_valid,
606 .begin = acpi_suspend_begin_old,
607 .prepare_late = acpi_pm_pre_suspend,
608 .enter = acpi_suspend_enter,
609 .wake = acpi_pm_finish,
610 .end = acpi_pm_end,
611 .recover = acpi_pm_finish,
612};
613
614static void acpi_sleep_suspend_setup(void)
615{
616 int i;
617
618 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
619 if (acpi_sleep_state_supported(i))
620 sleep_states[i] = 1;
621
622 suspend_set_ops(old_suspend_ordering ?
623 &acpi_suspend_ops_old : &acpi_suspend_ops);
624}
625#else /* !CONFIG_SUSPEND */
626static inline void acpi_sleep_suspend_setup(void) {}
627#endif /* !CONFIG_SUSPEND */
628
629#ifdef CONFIG_HIBERNATION
630static unsigned long s4_hardware_signature;
631static struct acpi_table_facs *facs;
632static bool nosigcheck;
633
634void __init acpi_no_s4_hw_signature(void)
635{
636 nosigcheck = true;
637}
638
639static int acpi_hibernation_begin(void)
640{
641 int error;
642
643 error = nvs_nosave ? 0 : suspend_nvs_alloc();
644 if (!error)
645 acpi_pm_start(ACPI_STATE_S4);
646
647 return error;
648}
649
650static int acpi_hibernation_enter(void)
651{
652 acpi_status status = AE_OK;
653
654 ACPI_FLUSH_CPU_CACHE();
655
656 /* This shouldn't return. If it returns, we have a problem */
657 status = acpi_enter_sleep_state(ACPI_STATE_S4);
658 /* Reprogram control registers */
659 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
660
661 return ACPI_SUCCESS(status) ? 0 : -EFAULT;
662}
663
664static void acpi_hibernation_leave(void)
665{
666 /*
667 * If ACPI is not enabled by the BIOS and the boot kernel, we need to
668 * enable it here.
669 */
670 acpi_enable();
671 /* Reprogram control registers */
672 acpi_leave_sleep_state_prep(ACPI_STATE_S4);
673 /* Check the hardware signature */
674 if (facs && s4_hardware_signature != facs->hardware_signature)
675 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
676 /* Restore the NVS memory area */
677 suspend_nvs_restore();
678 /* Allow EC transactions to happen. */
679 acpi_ec_unblock_transactions_early();
680}
681
682static void acpi_pm_thaw(void)
683{
684 acpi_ec_unblock_transactions();
685 acpi_enable_all_runtime_gpes();
686}
687
688static const struct platform_hibernation_ops acpi_hibernation_ops = {
689 .begin = acpi_hibernation_begin,
690 .end = acpi_pm_end,
691 .pre_snapshot = acpi_pm_prepare,
692 .finish = acpi_pm_finish,
693 .prepare = acpi_pm_prepare,
694 .enter = acpi_hibernation_enter,
695 .leave = acpi_hibernation_leave,
696 .pre_restore = acpi_pm_freeze,
697 .restore_cleanup = acpi_pm_thaw,
698};
699
700/**
701 * acpi_hibernation_begin_old - Set the target system sleep state to
702 * ACPI_STATE_S4 and execute the _PTS control method. This
703 * function is used if the pre-ACPI 2.0 suspend ordering has been
704 * requested.
705 */
706static int acpi_hibernation_begin_old(void)
707{
708 int error;
709 /*
710 * The _TTS object should always be evaluated before the _PTS object.
711 * When the old_suspended_ordering is true, the _PTS object is
712 * evaluated in the acpi_sleep_prepare.
713 */
714 acpi_sleep_tts_switch(ACPI_STATE_S4);
715
716 error = acpi_sleep_prepare(ACPI_STATE_S4);
717
718 if (!error) {
719 if (!nvs_nosave)
720 error = suspend_nvs_alloc();
721 if (!error) {
722 acpi_target_sleep_state = ACPI_STATE_S4;
723 acpi_scan_lock_acquire();
724 }
725 }
726 return error;
727}
728
729/*
730 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
731 * been requested.
732 */
733static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
734 .begin = acpi_hibernation_begin_old,
735 .end = acpi_pm_end,
736 .pre_snapshot = acpi_pm_pre_suspend,
737 .prepare = acpi_pm_freeze,
738 .finish = acpi_pm_finish,
739 .enter = acpi_hibernation_enter,
740 .leave = acpi_hibernation_leave,
741 .pre_restore = acpi_pm_freeze,
742 .restore_cleanup = acpi_pm_thaw,
743 .recover = acpi_pm_finish,
744};
745
746static void acpi_sleep_hibernate_setup(void)
747{
748 if (!acpi_sleep_state_supported(ACPI_STATE_S4))
749 return;
750
751 hibernation_set_ops(old_suspend_ordering ?
752 &acpi_hibernation_ops_old : &acpi_hibernation_ops);
753 sleep_states[ACPI_STATE_S4] = 1;
754 if (nosigcheck)
755 return;
756
757 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
758 if (facs)
759 s4_hardware_signature = facs->hardware_signature;
760}
761#else /* !CONFIG_HIBERNATION */
762static inline void acpi_sleep_hibernate_setup(void) {}
763#endif /* !CONFIG_HIBERNATION */
764
765int acpi_suspend(u32 acpi_state)
766{
767 suspend_state_t states[] = {
768 [1] = PM_SUSPEND_STANDBY,
769 [3] = PM_SUSPEND_MEM,
770 [5] = PM_SUSPEND_MAX
771 };
772
773 if (acpi_state < 6 && states[acpi_state])
774 return pm_suspend(states[acpi_state]);
775 if (acpi_state == 4)
776 return hibernate();
777 return -EINVAL;
778}
779
780static void acpi_power_off_prepare(void)
781{
782 /* Prepare to power off the system */
783 acpi_sleep_prepare(ACPI_STATE_S5);
784 acpi_disable_all_gpes();
785}
786
787static void acpi_power_off(void)
788{
789 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
790 printk(KERN_DEBUG "%s called\n", __func__);
791 local_irq_disable();
792 acpi_enter_sleep_state(ACPI_STATE_S5);
793}
794
795int __init acpi_sleep_init(void)
796{
797 char supported[ACPI_S_STATE_COUNT * 3 + 1];
798 char *pos = supported;
799 int i;
800
801 acpi_sleep_dmi_check();
802
803 sleep_states[ACPI_STATE_S0] = 1;
804
805 acpi_sleep_suspend_setup();
806 acpi_sleep_hibernate_setup();
807
808 if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
809 sleep_states[ACPI_STATE_S5] = 1;
810 pm_power_off_prepare = acpi_power_off_prepare;
811 pm_power_off = acpi_power_off;
812 }
813
814 supported[0] = 0;
815 for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
816 if (sleep_states[i])
817 pos += sprintf(pos, " S%d", i);
818 }
819 pr_info(PREFIX "(supports%s)\n", supported);
820
821 /*
822 * Register the tts_notifier to reboot notifier list so that the _TTS
823 * object can also be evaluated when the system enters S5.
824 */
825 register_reboot_notifier(&tts_notifier);
826 return 0;
827}