summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/device_pm.c
blob: 318fa32a141ec41c70c273b1f57f966f38fd55dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
/*
 * drivers/acpi/device_pm.c - ACPI device power management routines.
 *
 * Copyright (C) 2012, Intel Corp.
 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/device.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>

#include <acpi/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#include "internal.h"

#define _COMPONENT	ACPI_POWER_COMPONENT
ACPI_MODULE_NAME("device_pm");

/**
 * acpi_power_state_string - String representation of ACPI device power state.
 * @state: ACPI device power state to return the string representation of.
 */
const char *acpi_power_state_string(int state)
{
	switch (state) {
	case ACPI_STATE_D0:
		return "D0";
	case ACPI_STATE_D1:
		return "D1";
	case ACPI_STATE_D2:
		return "D2";
	case ACPI_STATE_D3_HOT:
		return "D3hot";
	case ACPI_STATE_D3_COLD:
		return "D3cold";
	default:
		return "(unknown)";
	}
}

/**
 * acpi_device_get_power - Get power state of an ACPI device.
 * @device: Device to get the power state of.
 * @state: Place to store the power state of the device.
 *
 * This function does not update the device's power.state field, but it may
 * update its parent's power.state field (when the parent's power state is
 * unknown and the device's power state turns out to be D0).
 */
int acpi_device_get_power(struct acpi_device *device, int *state)
{
	int result = ACPI_STATE_UNKNOWN;

	if (!device || !state)
		return -EINVAL;

	if (!device->flags.power_manageable) {
		/* TBD: Non-recursive algorithm for walking up hierarchy. */
		*state = device->parent ?
			device->parent->power.state : ACPI_STATE_D0;
		goto out;
	}

	/*
	 * Get the device's power state from power resources settings and _PSC,
	 * if available.
	 */
	if (device->power.flags.power_resources) {
		int error = acpi_power_get_inferred_state(device, &result);
		if (error)
			return error;
	}
	if (device->power.flags.explicit_get) {
		acpi_handle handle = device->handle;
		unsigned long long psc;
		acpi_status status;

		status = acpi_evaluate_integer(handle, "_PSC", NULL, &psc);
		if (ACPI_FAILURE(status))
			return -ENODEV;

		/*
		 * The power resources settings may indicate a power state
		 * shallower than the actual power state of the device.
		 *
		 * Moreover, on systems predating ACPI 4.0, if the device
		 * doesn't depend on any power resources and _PSC returns 3,
		 * that means "power off".  We need to maintain compatibility
		 * with those systems.
		 */
		if (psc > result && psc < ACPI_STATE_D3_COLD)
			result = psc;
		else if (result == ACPI_STATE_UNKNOWN)
			result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_COLD : psc;
	}

	/*
	 * If we were unsure about the device parent's power state up to this
	 * point, the fact that the device is in D0 implies that the parent has
	 * to be in D0 too.
	 */
	if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
	    && result == ACPI_STATE_D0)
		device->parent->power.state = ACPI_STATE_D0;

	*state = result;

 out:
	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
			  device->pnp.bus_id, acpi_power_state_string(*state)));

	return 0;
}

static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state)
{
	if (adev->power.states[state].flags.explicit_set) {
		char method[5] = { '_', 'P', 'S', '0' + state, '\0' };
		acpi_status status;

		status = acpi_evaluate_object(adev->handle, method, NULL, NULL);
		if (ACPI_FAILURE(status))
			return -ENODEV;
	}
	return 0;
}

/**
 * acpi_device_set_power - Set power state of an ACPI device.
 * @device: Device to set the power state of.
 * @state: New power state to set.
 *
 * Callers must ensure that the device is power manageable before using this
 * function.
 */
int acpi_device_set_power(struct acpi_device *device, int state)
{
	int result = 0;
	bool cut_power = false;

	if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
		return -EINVAL;

	/* Make sure this is a valid target state */

	if (state == device->power.state) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
				  acpi_power_state_string(state)));
		return 0;
	}

	if (!device->power.states[state].flags.valid) {
		printk(KERN_WARNING PREFIX "Device does not support %s\n",
		       acpi_power_state_string(state));
		return -ENODEV;
	}
	if (device->parent && (state < device->parent->power.state)) {
		printk(KERN_WARNING PREFIX
			      "Cannot set device to a higher-powered"
			      " state than parent\n");
		return -ENODEV;
	}

	/* For D3cold we should first transition into D3hot. */
	if (state == ACPI_STATE_D3_COLD
	    && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
		state = ACPI_STATE_D3_HOT;
		cut_power = true;
	}

	if (state < device->power.state && state != ACPI_STATE_D0
	    && device->power.state >= ACPI_STATE_D3_HOT) {
		printk(KERN_WARNING PREFIX
			"Cannot transition to non-D0 state from D3\n");
		return -ENODEV;
	}

	/*
	 * Transition Power
	 * ----------------
	 * In accordance with the ACPI specification first apply power (via
	 * power resources) and then evalute _PSx.
	 */
	if (device->power.flags.power_resources) {
		result = acpi_power_transition(device, state);
		if (result)
			goto end;
	}
	result = acpi_dev_pm_explicit_set(device, state);
	if (result)
		goto end;

	if (cut_power) {
		device->power.state = state;
		state = ACPI_STATE_D3_COLD;
		result = acpi_power_transition(device, state);
	}

 end:
	if (result) {
		printk(KERN_WARNING PREFIX
			      "Device [%s] failed to transition to %s\n",
			      device->pnp.bus_id,
			      acpi_power_state_string(state));
	} else {
		device->power.state = state;
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				  "Device [%s] transitioned to %s\n",
				  device->pnp.bus_id,
				  acpi_power_state_string(state)));
	}

	return result;
}
EXPORT_SYMBOL(acpi_device_set_power);

int acpi_bus_set_power(acpi_handle handle, int state)
{
	struct acpi_device *device;
	int result;

	result = acpi_bus_get_device(handle, &device);
	if (result)
		return result;

	if (!device->flags.power_manageable) {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
				"Device [%s] is not power manageable\n",
				dev_name(&device->dev)));
		return -ENODEV;
	}

	return acpi_device_set_power(device, state);
}
EXPORT_SYMBOL(acpi_bus_set_power);

int acpi_bus_init_power(struct acpi_device *device)
{
	int state;
	int result;

	if (!device)
		return -EINVAL;

	device->power.state = ACPI_STATE_UNKNOWN;

	result = acpi_device_get_power(device, &state);
	if (result)
		return result;

	if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
		result = acpi_power_on_resources(device, state);
		if (result)
			return result;

		result = acpi_dev_pm_explicit_set(device, state);
		if (result)
			return result;
	} else if (state == ACPI_STATE_UNKNOWN) {
		/*
		 * No power resources and missing _PSC?  Cross fingers and make
		 * it D0 in hope that this is what the BIOS put the device into.
		 * [We tried to force D0 here by executing _PS0, but that broke
		 * Toshiba P870-303 in a nasty way.]
		 */
		state = ACPI_STATE_D0;
	}
	device->power.state = state;
	return 0;
}

int acpi_bus_update_power(acpi_handle handle, int *state_p)
{
	struct acpi_device *device;
	int state;
	int result;

	result = acpi_bus_get_device(handle, &device);
	if (result)
		return result;

	result = acpi_device_get_power(device, &state);
	if (result)
		return result;

	if (state == ACPI_STATE_UNKNOWN)
		state = ACPI_STATE_D0;

	result = acpi_device_set_power(device, state);
	if (!result && state_p)
		*state_p = state;

	return result;
}
EXPORT_SYMBOL_GPL(acpi_bus_update_power);

bool acpi_bus_power_manageable(acpi_handle handle)
{
	struct acpi_device *device;
	int result;

	result = acpi_bus_get_device(handle, &device);
	return result ? false : device->flags.power_manageable;
}
EXPORT_SYMBOL(acpi_bus_power_manageable);

#ifdef CONFIG_PM
static DEFINE_MUTEX(acpi_pm_notifier_lock);

/**
 * acpi_add_pm_notifier - Register PM notifier for given ACPI device.
 * @adev: ACPI device to add the notifier for.
 * @context: Context information to pass to the notifier routine.
 *
 * NOTE: @adev need not be a run-wake or wakeup device to be a valid source of
 * PM wakeup events.  For example, wakeup events may be generated for bridges
 * if one of the devices below the bridge is signaling wakeup, even if the
 * bridge itself doesn't have a wakeup GPE associated with it.
 */
acpi_status acpi_add_pm_notifier(struct acpi_device *adev,
				 acpi_notify_handler handler, void *context)
{
	acpi_status status = AE_ALREADY_EXISTS;

	mutex_lock(&acpi_pm_notifier_lock);

	if (adev->wakeup.flags.notifier_present)
		goto out;

	status = acpi_install_notify_handler(adev->handle,
					     ACPI_SYSTEM_NOTIFY,
					     handler, context);
	if (ACPI_FAILURE(status))
		goto out;

	adev->wakeup.flags.notifier_present = true;

 out:
	mutex_unlock(&acpi_pm_notifier_lock);
	return status;
}

/**
 * acpi_remove_pm_notifier - Unregister PM notifier from given ACPI device.
 * @adev: ACPI device to remove the notifier from.
 */
acpi_status acpi_remove_pm_notifier(struct acpi_device *adev,
				    acpi_notify_handler handler)
{
	acpi_status status = AE_BAD_PARAMETER;

	mutex_lock(&acpi_pm_notifier_lock);

	if (!adev->wakeup.flags.notifier_present)
		goto out;

	status = acpi_remove_notify_handler(adev->handle,
					    ACPI_SYSTEM_NOTIFY,
					    handler);
	if (ACPI_FAILURE(status))
		goto out;

	adev->wakeup.flags.notifier_present = false;

 out:
	mutex_unlock(&acpi_pm_notifier_lock);
	return status;
}

bool acpi_bus_can_wakeup(acpi_handle handle)
{
	struct acpi_device *device;
	int result;

	result = acpi_bus_get_device(handle, &device);
	return result ? false : device->wakeup.flags.valid;
}
EXPORT_SYMBOL(acpi_bus_can_wakeup);

/**
 * acpi_device_power_state - Get preferred power state of ACPI device.
 * @dev: Device whose preferred target power state to return.
 * @adev: ACPI device node corresponding to @dev.
 * @target_state: System state to match the resultant device state.
 * @d_max_in: Deepest low-power state to take into consideration.
 * @d_min_p: Location to store the upper limit of the allowed states range.
 * Return value: Preferred power state of the device on success, -ENODEV
 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
 *
 * Find the lowest power (highest number) ACPI device power state that the
 * device can be in while the system is in the state represented by
 * @target_state.  If @d_min_p is set, the highest power (lowest number) device
 * power state that @dev can be in for the given system sleep state is stored
 * at the location pointed to by it.
 *
 * Callers must ensure that @dev and @adev are valid pointers and that @adev
 * actually corresponds to @dev before using this function.
 */
int acpi_device_power_state(struct device *dev, struct acpi_device *adev,
			    u32 target_state, int d_max_in, int *d_min_p)
{
	char acpi_method[] = "_SxD";
	unsigned long long d_min, d_max;
	bool wakeup = false;

	if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
		return -EINVAL;

	if (d_max_in > ACPI_STATE_D3_HOT) {
		enum pm_qos_flags_status stat;

		stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
		if (stat == PM_QOS_FLAGS_ALL)
			d_max_in = ACPI_STATE_D3_HOT;
	}

	acpi_method[2] = '0' + target_state;
	/*
	 * If the sleep state is S0, the lowest limit from ACPI is D3,
	 * but if the device has _S0W, we will use the value from _S0W
	 * as the lowest limit from ACPI.  Finally, we will constrain
	 * the lowest limit with the specified one.
	 */
	d_min = ACPI_STATE_D0;
	d_max = ACPI_STATE_D3;

	/*
	 * If present, _SxD methods return the minimum D-state (highest power
	 * state) we can use for the corresponding S-states.  Otherwise, the
	 * minimum D-state is D0 (ACPI 3.x).
	 *
	 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
	 * provided -- that's our fault recovery, we ignore retval.
	 */
	if (target_state > ACPI_STATE_S0) {
		acpi_evaluate_integer(adev->handle, acpi_method, NULL, &d_min);
		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
			&& adev->wakeup.sleep_state >= target_state;
	} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
			PM_QOS_FLAGS_NONE) {
		wakeup = adev->wakeup.flags.valid;
	}

	/*
	 * If _PRW says we can wake up the system from the target sleep state,
	 * the D-state returned by _SxD is sufficient for that (we assume a
	 * wakeup-aware driver if wake is set).  Still, if _SxW exists
	 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
	 * can wake the system.  _S0W may be valid, too.
	 */
	if (wakeup) {
		acpi_status status;

		acpi_method[3] = 'W';
		status = acpi_evaluate_integer(adev->handle, acpi_method, NULL,
						&d_max);
		if (ACPI_FAILURE(status)) {
			if (target_state != ACPI_STATE_S0 ||
			    status != AE_NOT_FOUND)
				d_max = d_min;
		} else if (d_max < d_min) {
			/* Warn the user of the broken DSDT */
			printk(KERN_WARNING "ACPI: Wrong value from %s\n",
				acpi_method);
			/* Sanitize it */
			d_min = d_max;
		}
	}

	if (d_max_in < d_min)
		return -EINVAL;
	if (d_min_p)
		*d_min_p = d_min;
	/* constrain d_max with specified lowest limit (max number) */
	if (d_max > d_max_in) {
		for (d_max = d_max_in; d_max > d_min; d_max--) {
			if (adev->power.states[d_max].flags.valid)
				break;
		}
	}
	return d_max;
}
EXPORT_SYMBOL_GPL(acpi_device_power_state);

/**
 * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
 * @dev: Device whose preferred target power state to return.
 * @d_min_p: Location to store the upper limit of the allowed states range.
 * @d_max_in: Deepest low-power state to take into consideration.
 * Return value: Preferred power state of the device on success, -ENODEV
 * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
 *
 * The caller must ensure that @dev is valid before using this function.
 */
int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	struct acpi_device *adev;

	if (!handle || acpi_bus_get_device(handle, &adev)) {
		dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
		return -ENODEV;
	}

	return acpi_device_power_state(dev, adev, acpi_target_system_state(),
				       d_max_in, d_min_p);
}
EXPORT_SYMBOL(acpi_pm_device_sleep_state);

#ifdef CONFIG_PM_RUNTIME
/**
 * acpi_wakeup_device - Wakeup notification handler for ACPI devices.
 * @handle: ACPI handle of the device the notification is for.
 * @event: Type of the signaled event.
 * @context: Device corresponding to @handle.
 */
static void acpi_wakeup_device(acpi_handle handle, u32 event, void *context)
{
	struct device *dev = context;

	if (event == ACPI_NOTIFY_DEVICE_WAKE && dev) {
		pm_wakeup_event(dev, 0);
		pm_runtime_resume(dev);
	}
}

/**
 * __acpi_device_run_wake - Enable/disable runtime remote wakeup for device.
 * @adev: ACPI device to enable/disable the remote wakeup for.
 * @enable: Whether to enable or disable the wakeup functionality.
 *
 * Enable/disable the GPE associated with @adev so that it can generate
 * wakeup signals for the device in response to external (remote) events and
 * enable/disable device wakeup power.
 *
 * Callers must ensure that @adev is a valid ACPI device node before executing
 * this function.
 */
int __acpi_device_run_wake(struct acpi_device *adev, bool enable)
{
	struct acpi_device_wakeup *wakeup = &adev->wakeup;

	if (enable) {
		acpi_status res;
		int error;

		error = acpi_enable_wakeup_device_power(adev, ACPI_STATE_S0);
		if (error)
			return error;

		res = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
		if (ACPI_FAILURE(res)) {
			acpi_disable_wakeup_device_power(adev);
			return -EIO;
		}
	} else {
		acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
		acpi_disable_wakeup_device_power(adev);
	}
	return 0;
}

/**
 * acpi_pm_device_run_wake - Enable/disable remote wakeup for given device.
 * @dev: Device to enable/disable the platform to wake up.
 * @enable: Whether to enable or disable the wakeup functionality.
 */
int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
{
	struct acpi_device *adev;
	acpi_handle handle;

	if (!device_run_wake(phys_dev))
		return -EINVAL;

	handle = DEVICE_ACPI_HANDLE(phys_dev);
	if (!handle || acpi_bus_get_device(handle, &adev)) {
		dev_dbg(phys_dev, "ACPI handle without context in %s!\n",
			__func__);
		return -ENODEV;
	}

	return __acpi_device_run_wake(adev, enable);
}
EXPORT_SYMBOL(acpi_pm_device_run_wake);
#else
static inline void acpi_wakeup_device(acpi_handle handle, u32 event,
				      void *context) {}
#endif /* CONFIG_PM_RUNTIME */

#ifdef CONFIG_PM_SLEEP
/**
 * __acpi_device_sleep_wake - Enable or disable device to wake up the system.
 * @dev: Device to enable/desible to wake up the system.
 * @target_state: System state the device is supposed to wake up from.
 * @enable: Whether to enable or disable @dev to wake up the system.
 */
int __acpi_device_sleep_wake(struct acpi_device *adev, u32 target_state,
			     bool enable)
{
	return enable ?
		acpi_enable_wakeup_device_power(adev, target_state) :
		acpi_disable_wakeup_device_power(adev);
}

/**
 * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
 * @dev: Device to enable/desible to wake up the system from sleep states.
 * @enable: Whether to enable or disable @dev to wake up the system.
 */
int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
{
	acpi_handle handle;
	struct acpi_device *adev;
	int error;

	if (!device_can_wakeup(dev))
		return -EINVAL;

	handle = DEVICE_ACPI_HANDLE(dev);
	if (!handle || acpi_bus_get_device(handle, &adev)) {
		dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
		return -ENODEV;
	}

	error = __acpi_device_sleep_wake(adev, acpi_target_system_state(),
					 enable);
	if (!error)
		dev_info(dev, "System wakeup %s by ACPI\n",
				enable ? "enabled" : "disabled");

	return error;
}
#endif /* CONFIG_PM_SLEEP */

/**
 * acpi_dev_pm_get_node - Get ACPI device node for the given physical device.
 * @dev: Device to get the ACPI node for.
 */
struct acpi_device *acpi_dev_pm_get_node(struct device *dev)
{
	acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
	struct acpi_device *adev;

	return handle && !acpi_bus_get_device(handle, &adev) ? adev : NULL;
}

/**
 * acpi_dev_pm_low_power - Put ACPI device into a low-power state.
 * @dev: Device to put into a low-power state.
 * @adev: ACPI device node corresponding to @dev.
 * @system_state: System state to choose the device state for.
 */
static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
				 u32 system_state)
{
	int power_state;

	if (!acpi_device_power_manageable(adev))
		return 0;

	power_state = acpi_device_power_state(dev, adev, system_state,
					      ACPI_STATE_D3, NULL);
	if (power_state < ACPI_STATE_D0 || power_state > ACPI_STATE_D3)
		return -EIO;

	return acpi_device_set_power(adev, power_state);
}

/**
 * acpi_dev_pm_full_power - Put ACPI device into the full-power state.
 * @adev: ACPI device node to put into the full-power state.
 */
static int acpi_dev_pm_full_power(struct acpi_device *adev)
{
	return acpi_device_power_manageable(adev) ?
		acpi_device_set_power(adev, ACPI_STATE_D0) : 0;
}

#ifdef CONFIG_PM_RUNTIME
/**
 * acpi_dev_runtime_suspend - Put device into a low-power state using ACPI.
 * @dev: Device to put into a low-power state.
 *
 * Put the given device into a runtime low-power state using the standard ACPI
 * mechanism.  Set up remote wakeup if desired, choose the state to put the
 * device into (this checks if remote wakeup is expected to work too), and set
 * the power state of the device.
 */
int acpi_dev_runtime_suspend(struct device *dev)
{
	struct acpi_device *adev = acpi_dev_pm_get_node(dev);
	bool remote_wakeup;
	int error;

	if (!adev)
		return 0;

	remote_wakeup = dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) >
				PM_QOS_FLAGS_NONE;
	error = __acpi_device_run_wake(adev, remote_wakeup);
	if (remote_wakeup && error)
		return -EAGAIN;

	error = acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
	if (error)
		__acpi_device_run_wake(adev, false);

	return error;
}
EXPORT_SYMBOL_GPL(acpi_dev_runtime_suspend);

/**
 * acpi_dev_runtime_resume - Put device into the full-power state using ACPI.
 * @dev: Device to put into the full-power state.
 *
 * Put the given device into the full-power state using the standard ACPI
 * mechanism at run time.  Set the power state of the device to ACPI D0 and
 * disable remote wakeup.
 */
int acpi_dev_runtime_resume(struct device *dev)
{
	struct acpi_device *adev = acpi_dev_pm_get_node(dev);
	int error;

	if (!adev)
		return 0;

	error = acpi_dev_pm_full_power(adev);
	__acpi_device_run_wake(adev, false);
	return error;
}
EXPORT_SYMBOL_GPL(acpi_dev_runtime_resume);

/**
 * acpi_subsys_runtime_suspend - Suspend device using ACPI.
 * @dev: Device to suspend.
 *
 * Carry out the generic runtime suspend procedure for @dev and use ACPI to put
 * it into a runtime low-power state.
 */
int acpi_subsys_runtime_suspend(struct device *dev)
{
	int ret = pm_generic_runtime_suspend(dev);
	return ret ? ret : acpi_dev_runtime_suspend(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);

/**
 * acpi_subsys_runtime_resume - Resume device using ACPI.
 * @dev: Device to Resume.
 *
 * Use ACPI to put the given device into the full-power state and carry out the
 * generic runtime resume procedure for it.
 */
int acpi_subsys_runtime_resume(struct device *dev)
{
	int ret = acpi_dev_runtime_resume(dev);
	return ret ? ret : pm_generic_runtime_resume(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
#endif /* CONFIG_PM_RUNTIME */

#ifdef CONFIG_PM_SLEEP
/**
 * acpi_dev_suspend_late - Put device into a low-power state using ACPI.
 * @dev: Device to put into a low-power state.
 *
 * Put the given device into a low-power state during system transition to a
 * sleep state using the standard ACPI mechanism.  Set up system wakeup if
 * desired, choose the state to put the device into (this checks if system
 * wakeup is expected to work too), and set the power state of the device.
 */
int acpi_dev_suspend_late(struct device *dev)
{
	struct acpi_device *adev = acpi_dev_pm_get_node(dev);
	u32 target_state;
	bool wakeup;
	int error;

	if (!adev)
		return 0;

	target_state = acpi_target_system_state();
	wakeup = device_may_wakeup(dev);
	error = __acpi_device_sleep_wake(adev, target_state, wakeup);
	if (wakeup && error)
		return error;

	error = acpi_dev_pm_low_power(dev, adev, target_state);
	if (error)
		__acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false);

	return error;
}
EXPORT_SYMBOL_GPL(acpi_dev_suspend_late);

/**
 * acpi_dev_resume_early - Put device into the full-power state using ACPI.
 * @dev: Device to put into the full-power state.
 *
 * Put the given device into the full-power state using the standard ACPI
 * mechanism during system transition to the working state.  Set the power
 * state of the device to ACPI D0 and disable remote wakeup.
 */
int acpi_dev_resume_early(struct device *dev)
{
	struct acpi_device *adev = acpi_dev_pm_get_node(dev);
	int error;

	if (!adev)
		return 0;

	error = acpi_dev_pm_full_power(adev);
	__acpi_device_sleep_wake(adev, ACPI_STATE_UNKNOWN, false);
	return error;
}
EXPORT_SYMBOL_GPL(acpi_dev_resume_early);

/**
 * acpi_subsys_prepare - Prepare device for system transition to a sleep state.
 * @dev: Device to prepare.
 */
int acpi_subsys_prepare(struct device *dev)
{
	/*
	 * Follow PCI and resume devices suspended at run time before running
	 * their system suspend callbacks.
	 */
	pm_runtime_resume(dev);
	return pm_generic_prepare(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_prepare);

/**
 * acpi_subsys_suspend_late - Suspend device using ACPI.
 * @dev: Device to suspend.
 *
 * Carry out the generic late suspend procedure for @dev and use ACPI to put
 * it into a low-power state during system transition into a sleep state.
 */
int acpi_subsys_suspend_late(struct device *dev)
{
	int ret = pm_generic_suspend_late(dev);
	return ret ? ret : acpi_dev_suspend_late(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);

/**
 * acpi_subsys_resume_early - Resume device using ACPI.
 * @dev: Device to Resume.
 *
 * Use ACPI to put the given device into the full-power state and carry out the
 * generic early resume procedure for it during system transition into the
 * working state.
 */
int acpi_subsys_resume_early(struct device *dev)
{
	int ret = acpi_dev_resume_early(dev);
	return ret ? ret : pm_generic_resume_early(dev);
}
EXPORT_SYMBOL_GPL(acpi_subsys_resume_early);
#endif /* CONFIG_PM_SLEEP */

static struct dev_pm_domain acpi_general_pm_domain = {
	.ops = {
#ifdef CONFIG_PM_RUNTIME
		.runtime_suspend = acpi_subsys_runtime_suspend,
		.runtime_resume = acpi_subsys_runtime_resume,
		.runtime_idle = pm_generic_runtime_idle,
#endif
#ifdef CONFIG_PM_SLEEP
		.prepare = acpi_subsys_prepare,
		.suspend_late = acpi_subsys_suspend_late,
		.resume_early = acpi_subsys_resume_early,
		.poweroff_late = acpi_subsys_suspend_late,
		.restore_early = acpi_subsys_resume_early,
#endif
	},
};

/**
 * acpi_dev_pm_attach - Prepare device for ACPI power management.
 * @dev: Device to prepare.
 * @power_on: Whether or not to power on the device.
 *
 * If @dev has a valid ACPI handle that has a valid struct acpi_device object
 * attached to it, install a wakeup notification handler for the device and
 * add it to the general ACPI PM domain.  If @power_on is set, the device will
 * be put into the ACPI D0 state before the function returns.
 *
 * This assumes that the @dev's bus type uses generic power management callbacks
 * (or doesn't use any power management callbacks at all).
 *
 * Callers must ensure proper synchronization of this function with power
 * management callbacks.
 */
int acpi_dev_pm_attach(struct device *dev, bool power_on)
{
	struct acpi_device *adev = acpi_dev_pm_get_node(dev);

	if (!adev)
		return -ENODEV;

	if (dev->pm_domain)
		return -EEXIST;

	acpi_add_pm_notifier(adev, acpi_wakeup_device, dev);
	dev->pm_domain = &acpi_general_pm_domain;
	if (power_on) {
		acpi_dev_pm_full_power(adev);
		__acpi_device_run_wake(adev, false);
	}
	return 0;
}
EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);

/**
 * acpi_dev_pm_detach - Remove ACPI power management from the device.
 * @dev: Device to take care of.
 * @power_off: Whether or not to try to remove power from the device.
 *
 * Remove the device from the general ACPI PM domain and remove its wakeup
 * notifier.  If @power_off is set, additionally remove power from the device if
 * possible.
 *
 * Callers must ensure proper synchronization of this function with power
 * management callbacks.
 */
void acpi_dev_pm_detach(struct device *dev, bool power_off)
{
	struct acpi_device *adev = acpi_dev_pm_get_node(dev);

	if (adev && dev->pm_domain == &acpi_general_pm_domain) {
		dev->pm_domain = NULL;
		acpi_remove_pm_notifier(adev, acpi_wakeup_device);
		if (power_off) {
			/*
			 * If the device's PM QoS resume latency limit or flags
			 * have been exposed to user space, they have to be
			 * hidden at this point, so that they don't affect the
			 * choice of the low-power state to put the device into.
			 */
			dev_pm_qos_hide_latency_limit(dev);
			dev_pm_qos_hide_flags(dev);
			__acpi_device_run_wake(adev, false);
			acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
		}
	}
}
EXPORT_SYMBOL_GPL(acpi_dev_pm_detach);

/**
 * acpi_dev_pm_add_dependent - Add physical device depending for PM.
 * @handle: Handle of ACPI device node.
 * @depdev: Device depending on that node for PM.
 */
void acpi_dev_pm_add_dependent(acpi_handle handle, struct device *depdev)
{
	struct acpi_device_physical_node *dep;
	struct acpi_device *adev;

	if (!depdev || acpi_bus_get_device(handle, &adev))
		return;

	mutex_lock(&adev->physical_node_lock);

	list_for_each_entry(dep, &adev->power_dependent, node)
		if (dep->dev == depdev)
			goto out;

	dep = kzalloc(sizeof(*dep), GFP_KERNEL);
	if (dep) {
		dep->dev = depdev;
		list_add_tail(&dep->node, &adev->power_dependent);
	}

 out:
	mutex_unlock(&adev->physical_node_lock);
}
EXPORT_SYMBOL_GPL(acpi_dev_pm_add_dependent);

/**
 * acpi_dev_pm_remove_dependent - Remove physical device depending for PM.
 * @handle: Handle of ACPI device node.
 * @depdev: Device depending on that node for PM.
 */
void acpi_dev_pm_remove_dependent(acpi_handle handle, struct device *depdev)
{
	struct acpi_device_physical_node *dep;
	struct acpi_device *adev;

	if (!depdev || acpi_bus_get_device(handle, &adev))
		return;

	mutex_lock(&adev->physical_node_lock);

	list_for_each_entry(dep, &adev->power_dependent, node)
		if (dep->dev == depdev) {
			list_del(&dep->node);
			kfree(dep);
			break;
		}

	mutex_unlock(&adev->physical_node_lock);
}
EXPORT_SYMBOL_GPL(acpi_dev_pm_remove_dependent);
#endif /* CONFIG_PM */