summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/evxfgpe.c
blob: 30a083902f522115f23642233805a3c7fb11a812 (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
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: evxfgpe - External Interfaces for General Purpose Events (GPEs)
 *
 * Copyright (C) 2000 - 2019, Intel Corp.
 *
 *****************************************************************************/

#define EXPORT_ACPI_INTERFACES

#include <acpi/acpi.h>
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evxfgpe")

#if (!ACPI_REDUCED_HARDWARE)	/* Entire module */
/*******************************************************************************
 *
 * FUNCTION:    acpi_update_all_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Complete GPE initialization and enable all GPEs that have
 *              associated _Lxx or _Exx methods and are not pointed to by any
 *              device _PRW methods (this indicates that these GPEs are
 *              generally intended for system or device wakeup. Such GPEs
 *              have to be enabled directly when the devices whose _PRW
 *              methods point to them are set up for wakeup signaling.)
 *
 * NOTE: Should be called after any GPEs are added to the system. Primarily,
 * after the system _PRW methods have been run, but also after a GPE Block
 * Device has been added or if any new GPE methods have been added via a
 * dynamic table load.
 *
 ******************************************************************************/

acpi_status acpi_update_all_gpes(void)
{
	acpi_status status;
	u8 is_polling_needed = FALSE;

	ACPI_FUNCTION_TRACE(acpi_update_all_gpes);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	if (acpi_gbl_all_gpes_initialized) {
		goto unlock_and_exit;
	}

	status = acpi_ev_walk_gpe_list(acpi_ev_initialize_gpe_block,
				       &is_polling_needed);
	if (ACPI_SUCCESS(status)) {
		acpi_gbl_all_gpes_initialized = TRUE;
	}

unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	if (is_polling_needed && acpi_gbl_all_gpes_initialized) {

		/* Poll GPEs to handle already triggered events */

		acpi_ev_gpe_detect(acpi_gbl_gpe_xrupt_list_head);
	}
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_update_all_gpes)

/*******************************************************************************
 *
 * FUNCTION:    acpi_enable_gpe
 *
 * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is
 *              hardware-enabled.
 *
 ******************************************************************************/
acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
{
	acpi_status status = AE_BAD_PARAMETER;
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_enable_gpe);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/*
	 * Ensure that we have a valid GPE number and that there is some way
	 * of handling the GPE (handler or a GPE method). In other words, we
	 * won't allow a valid GPE to be enabled if there is no way to handle it.
	 */
	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (gpe_event_info) {
		if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) !=
		    ACPI_GPE_DISPATCH_NONE) {
			status = acpi_ev_add_gpe_reference(gpe_event_info);
			if (ACPI_SUCCESS(status) &&
			    ACPI_GPE_IS_POLLING_NEEDED(gpe_event_info)) {

				/* Poll edge-triggered GPEs to handle existing events */

				acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
				(void)acpi_ev_detect_gpe(gpe_device,
							 gpe_event_info,
							 gpe_number);
				flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
			}
		} else {
			status = AE_NO_HANDLER;
		}
	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_enable_gpe)

/*******************************************************************************
 *
 * FUNCTION:    acpi_disable_gpe
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number      - GPE level within the GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a reference to a GPE. When the last reference is
 *              removed, only then is the GPE disabled (for runtime GPEs), or
 *              the GPE mask bit disabled (for wake GPEs)
 *
 ******************************************************************************/

acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
{
	acpi_status status = AE_BAD_PARAMETER;
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_disable_gpe);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (gpe_event_info) {
		status = acpi_ev_remove_gpe_reference(gpe_event_info) ;
	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_disable_gpe)

/*******************************************************************************
 *
 * FUNCTION:    acpi_set_gpe
 *
 * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *              action              - ACPI_GPE_ENABLE or ACPI_GPE_DISABLE
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable or disable an individual GPE. This function bypasses
 *              the reference count mechanism used in the acpi_enable_gpe(),
 *              acpi_disable_gpe() interfaces.
 *              This API is typically used by the GPE raw handler mode driver
 *              to switch between the polling mode and the interrupt mode after
 *              the driver has enabled the GPE.
 *              The APIs should be invoked in this order:
 *               acpi_enable_gpe()            <- Ensure the reference count > 0
 *               acpi_set_gpe(ACPI_GPE_DISABLE) <- Enter polling mode
 *               acpi_set_gpe(ACPI_GPE_ENABLE) <- Leave polling mode
 *               acpi_disable_gpe()           <- Decrease the reference count
 *
 * Note: If a GPE is shared by 2 silicon components, then both the drivers
 *       should support GPE polling mode or disabling the GPE for long period
 *       for one driver may break the other. So use it with care since all
 *       firmware _Lxx/_Exx handlers currently rely on the GPE interrupt mode.
 *
 ******************************************************************************/
acpi_status acpi_set_gpe(acpi_handle gpe_device, u32 gpe_number, u8 action)
{
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_set_gpe);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Perform the action */

	switch (action) {
	case ACPI_GPE_ENABLE:

		status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE);
		gpe_event_info->disable_for_dispatch = FALSE;
		break;

	case ACPI_GPE_DISABLE:

		status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
		gpe_event_info->disable_for_dispatch = TRUE;
		break;

	default:

		status = AE_BAD_PARAMETER;
		break;
	}

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_set_gpe)

/*******************************************************************************
 *
 * FUNCTION:    acpi_mask_gpe
 *
 * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *              is_masked           - Whether the GPE is masked or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Unconditionally mask/unmask the an individual GPE, ex., to
 *              prevent a GPE flooding.
 *
 ******************************************************************************/
acpi_status acpi_mask_gpe(acpi_handle gpe_device, u32 gpe_number, u8 is_masked)
{
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_mask_gpe);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	status = acpi_ev_mask_gpe(gpe_event_info, is_masked);

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_mask_gpe)

/*******************************************************************************
 *
 * FUNCTION:    acpi_mark_gpe_for_wake
 *
 * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Mark a GPE as having the ability to wake the system. Simply
 *              sets the ACPI_GPE_CAN_WAKE flag.
 *
 * Some potential callers of acpi_setup_gpe_for_wake may know in advance that
 * there won't be any notify handlers installed for device wake notifications
 * from the given GPE (one example is a button GPE in Linux). For these cases,
 * acpi_mark_gpe_for_wake should be used instead of acpi_setup_gpe_for_wake.
 * This will set the ACPI_GPE_CAN_WAKE flag for the GPE without trying to
 * setup implicit wake notification for it (since there's no handler method).
 *
 ******************************************************************************/
acpi_status acpi_mark_gpe_for_wake(acpi_handle gpe_device, u32 gpe_number)
{
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_status status = AE_BAD_PARAMETER;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_mark_gpe_for_wake);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (gpe_event_info) {

		/* Mark the GPE as a possible wake event */

		gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
		status = AE_OK;
	}

	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_mark_gpe_for_wake)

/*******************************************************************************
 *
 * FUNCTION:    acpi_setup_gpe_for_wake
 *
 * PARAMETERS:  wake_device         - Device associated with the GPE (via _PRW)
 *              gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Mark a GPE as having the ability to wake the system. This
 *              interface is intended to be used as the host executes the
 *              _PRW methods (Power Resources for Wake) in the system tables.
 *              Each _PRW appears under a Device Object (The wake_device), and
 *              contains the info for the wake GPE associated with the
 *              wake_device.
 *
 ******************************************************************************/
acpi_status
acpi_setup_gpe_for_wake(acpi_handle wake_device,
			acpi_handle gpe_device, u32 gpe_number)
{
	acpi_status status;
	struct acpi_gpe_event_info *gpe_event_info;
	struct acpi_namespace_node *device_node;
	struct acpi_gpe_notify_info *notify;
	struct acpi_gpe_notify_info *new_notify;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_setup_gpe_for_wake);

	/* Parameter Validation */

	if (!wake_device) {
		/*
		 * By forcing wake_device to be valid, we automatically enable the
		 * implicit notify feature on all hosts.
		 */
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Handle root object case */

	if (wake_device == ACPI_ROOT_OBJECT) {
		device_node = acpi_gbl_root_node;
	} else {
		device_node =
		    ACPI_CAST_PTR(struct acpi_namespace_node, wake_device);
	}

	/* Validate wake_device is of type Device */

	if (device_node->type != ACPI_TYPE_DEVICE) {
		return_ACPI_STATUS (AE_BAD_PARAMETER);
	}

	/*
	 * Allocate a new notify object up front, in case it is needed.
	 * Memory allocation while holding a spinlock is a big no-no
	 * on some hosts.
	 */
	new_notify = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_gpe_notify_info));
	if (!new_notify) {
		return_ACPI_STATUS(AE_NO_MEMORY);
	}

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/*
	 * If there is no method or handler for this GPE, then the
	 * wake_device will be notified whenever this GPE fires. This is
	 * known as an "implicit notify". Note: The GPE is assumed to be
	 * level-triggered (for windows compatibility).
	 */
	if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
	    ACPI_GPE_DISPATCH_NONE) {
		/*
		 * This is the first device for implicit notify on this GPE.
		 * Just set the flags here, and enter the NOTIFY block below.
		 */
		gpe_event_info->flags =
		    (ACPI_GPE_DISPATCH_NOTIFY | ACPI_GPE_LEVEL_TRIGGERED);
	} else if (gpe_event_info->flags & ACPI_GPE_AUTO_ENABLED) {
		/*
		 * A reference to this GPE has been added during the GPE block
		 * initialization, so drop it now to prevent the GPE from being
		 * permanently enabled and clear its ACPI_GPE_AUTO_ENABLED flag.
		 */
		(void)acpi_ev_remove_gpe_reference(gpe_event_info);
		gpe_event_info->flags &= ~ACPI_GPE_AUTO_ENABLED;
	}

	/*
	 * If we already have an implicit notify on this GPE, add
	 * this device to the notify list.
	 */
	if (ACPI_GPE_DISPATCH_TYPE(gpe_event_info->flags) ==
	    ACPI_GPE_DISPATCH_NOTIFY) {

		/* Ensure that the device is not already in the list */

		notify = gpe_event_info->dispatch.notify_list;
		while (notify) {
			if (notify->device_node == device_node) {
				status = AE_ALREADY_EXISTS;
				goto unlock_and_exit;
			}
			notify = notify->next;
		}

		/* Add this device to the notify list for this GPE */

		new_notify->device_node = device_node;
		new_notify->next = gpe_event_info->dispatch.notify_list;
		gpe_event_info->dispatch.notify_list = new_notify;
		new_notify = NULL;
	}

	/* Mark the GPE as a possible wake event */

	gpe_event_info->flags |= ACPI_GPE_CAN_WAKE;
	status = AE_OK;

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);

	/* Delete the notify object if it was not used above */

	if (new_notify) {
		ACPI_FREE(new_notify);
	}
	return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_setup_gpe_for_wake)

/*******************************************************************************
 *
 * FUNCTION:    acpi_set_gpe_wake_mask
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number      - GPE level within the GPE block
 *              action              - Enable or Disable
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Set or clear the GPE's wakeup enable mask bit. The GPE must
 *              already be marked as a WAKE GPE.
 *
 ******************************************************************************/

acpi_status
acpi_set_gpe_wake_mask(acpi_handle gpe_device, u32 gpe_number, u8 action)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;
	struct acpi_gpe_register_info *gpe_register_info;
	acpi_cpu_flags flags;
	u32 register_bit;

	ACPI_FUNCTION_TRACE(acpi_set_gpe_wake_mask);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/*
	 * Ensure that we have a valid GPE number and that this GPE is in
	 * fact a wake GPE
	 */
	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	if (!(gpe_event_info->flags & ACPI_GPE_CAN_WAKE)) {
		status = AE_TYPE;
		goto unlock_and_exit;
	}

	gpe_register_info = gpe_event_info->register_info;
	if (!gpe_register_info) {
		status = AE_NOT_EXIST;
		goto unlock_and_exit;
	}

	register_bit = acpi_hw_get_gpe_register_bit(gpe_event_info);

	/* Perform the action */

	switch (action) {
	case ACPI_GPE_ENABLE:

		ACPI_SET_BIT(gpe_register_info->enable_for_wake,
			     (u8)register_bit);
		break;

	case ACPI_GPE_DISABLE:

		ACPI_CLEAR_BIT(gpe_register_info->enable_for_wake,
			       (u8)register_bit);
		break;

	default:

		ACPI_ERROR((AE_INFO, "%u, Invalid action", action));
		status = AE_BAD_PARAMETER;
		break;
	}

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_set_gpe_wake_mask)

/*******************************************************************************
 *
 * FUNCTION:    acpi_clear_gpe
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number      - GPE level within the GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear an ACPI event (general purpose)
 *
 ******************************************************************************/
acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_clear_gpe);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	status = acpi_hw_clear_gpe(gpe_event_info);

      unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_clear_gpe)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_gpe_status
 *
 * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *              event_status        - Where the current status of the event
 *                                    will be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the current status of a GPE (signalled/not_signalled)
 *
 ******************************************************************************/
acpi_status
acpi_get_gpe_status(acpi_handle gpe_device,
		    u32 gpe_number, acpi_event_status *event_status)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_get_gpe_status);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Obtain status on the requested GPE number */

	status = acpi_hw_get_gpe_status(gpe_event_info, event_status);

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)

/*******************************************************************************
 *
 * FUNCTION:    acpi_gispatch_gpe
 *
 * PARAMETERS:  gpe_device          - Parent GPE Device. NULL for GPE0/GPE1
 *              gpe_number          - GPE level within the GPE block
 *
 * RETURN:      None
 *
 * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function
 *              (e.g. EC) or method (e.g. _Lxx/_Exx) handler.
 *
 ******************************************************************************/
void acpi_dispatch_gpe(acpi_handle gpe_device, u32 gpe_number)
{
	ACPI_FUNCTION_TRACE(acpi_dispatch_gpe);

	acpi_ev_detect_gpe(gpe_device, NULL, gpe_number);
}

ACPI_EXPORT_SYMBOL(acpi_dispatch_gpe)

/*******************************************************************************
 *
 * FUNCTION:    acpi_finish_gpe
 *
 * PARAMETERS:  gpe_device          - Namespace node for the GPE Block
 *                                    (NULL for FADT defined GPEs)
 *              gpe_number          - GPE level within the GPE block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear and conditionally re-enable a GPE. This completes the GPE
 *              processing. Intended for use by asynchronous host-installed
 *              GPE handlers. The GPE is only re-enabled if the enable_for_run bit
 *              is set in the GPE info.
 *
 ******************************************************************************/
acpi_status acpi_finish_gpe(acpi_handle gpe_device, u32 gpe_number)
{
	struct acpi_gpe_event_info *gpe_event_info;
	acpi_status status;
	acpi_cpu_flags flags;

	ACPI_FUNCTION_TRACE(acpi_finish_gpe);

	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);

	/* Ensure that we have a valid GPE number */

	gpe_event_info = acpi_ev_get_gpe_event_info(gpe_device, gpe_number);
	if (!gpe_event_info) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	status = acpi_ev_finish_gpe(gpe_event_info);

unlock_and_exit:
	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_finish_gpe)

/******************************************************************************
 *
 * FUNCTION:    acpi_disable_all_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable and clear all GPEs in all GPE blocks
 *
 ******************************************************************************/

acpi_status acpi_disable_all_gpes(void)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_disable_all_gpes);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_hw_disable_all_gpes();
	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_disable_all_gpes)

/******************************************************************************
 *
 * FUNCTION:    acpi_enable_all_runtime_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable all "runtime" GPEs, in all GPE blocks
 *
 ******************************************************************************/

acpi_status acpi_enable_all_runtime_gpes(void)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_enable_all_runtime_gpes);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_hw_enable_all_runtime_gpes();
	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_enable_all_runtime_gpes)

/******************************************************************************
 *
 * FUNCTION:    acpi_enable_all_wakeup_gpes
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable all "wakeup" GPEs and disable all of the other GPEs, in
 *              all GPE blocks.
 *
 ******************************************************************************/
acpi_status acpi_enable_all_wakeup_gpes(void)
{
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_enable_all_wakeup_gpes);

	status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status = acpi_hw_enable_all_wakeup_gpes();
	(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_enable_all_wakeup_gpes)

/*******************************************************************************
 *
 * FUNCTION:    acpi_install_gpe_block
 *
 * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 *              gpe_block_address   - Address and space_ID
 *              register_count      - Number of GPE register pairs in the block
 *              interrupt_number    - H/W interrupt for the block
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Create and Install a block of GPE registers. The GPEs are not
 *              enabled here.
 *
 ******************************************************************************/
acpi_status
acpi_install_gpe_block(acpi_handle gpe_device,
		       struct acpi_generic_address *gpe_block_address,
		       u32 register_count, u32 interrupt_number)
{
	acpi_status status;
	union acpi_operand_object *obj_desc;
	struct acpi_namespace_node *node;
	struct acpi_gpe_block_info *gpe_block;

	ACPI_FUNCTION_TRACE(acpi_install_gpe_block);

	if ((!gpe_device) || (!gpe_block_address) || (!register_count)) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	node = acpi_ns_validate_handle(gpe_device);
	if (!node) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Validate the parent device */

	if (node->type != ACPI_TYPE_DEVICE) {
		status = AE_TYPE;
		goto unlock_and_exit;
	}

	if (node->object) {
		status = AE_ALREADY_EXISTS;
		goto unlock_and_exit;
	}

	/*
	 * For user-installed GPE Block Devices, the gpe_block_base_number
	 * is always zero
	 */
	status = acpi_ev_create_gpe_block(node, gpe_block_address->address,
					  gpe_block_address->space_id,
					  register_count, 0, interrupt_number,
					  &gpe_block);
	if (ACPI_FAILURE(status)) {
		goto unlock_and_exit;
	}

	/* Install block in the device_object attached to the node */

	obj_desc = acpi_ns_get_attached_object(node);
	if (!obj_desc) {

		/*
		 * No object, create a new one (Device nodes do not always have
		 * an attached object)
		 */
		obj_desc = acpi_ut_create_internal_object(ACPI_TYPE_DEVICE);
		if (!obj_desc) {
			status = AE_NO_MEMORY;
			goto unlock_and_exit;
		}

		status =
		    acpi_ns_attach_object(node, obj_desc, ACPI_TYPE_DEVICE);

		/* Remove local reference to the object */

		acpi_ut_remove_reference(obj_desc);

		if (ACPI_FAILURE(status)) {
			goto unlock_and_exit;
		}
	}

	/* Now install the GPE block in the device_object */

	obj_desc->device.gpe_block = gpe_block;

unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_install_gpe_block)

/*******************************************************************************
 *
 * FUNCTION:    acpi_remove_gpe_block
 *
 * PARAMETERS:  gpe_device          - Handle to the parent GPE Block Device
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Remove a previously installed block of GPE registers
 *
 ******************************************************************************/
acpi_status acpi_remove_gpe_block(acpi_handle gpe_device)
{
	union acpi_operand_object *obj_desc;
	acpi_status status;
	struct acpi_namespace_node *node;

	ACPI_FUNCTION_TRACE(acpi_remove_gpe_block);

	if (!gpe_device) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	node = acpi_ns_validate_handle(gpe_device);
	if (!node) {
		status = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	/* Validate the parent device */

	if (node->type != ACPI_TYPE_DEVICE) {
		status = AE_TYPE;
		goto unlock_and_exit;
	}

	/* Get the device_object attached to the node */

	obj_desc = acpi_ns_get_attached_object(node);
	if (!obj_desc || !obj_desc->device.gpe_block) {
		return_ACPI_STATUS(AE_NULL_OBJECT);
	}

	/* Delete the GPE block (but not the device_object) */

	status = acpi_ev_delete_gpe_block(obj_desc->device.gpe_block);
	if (ACPI_SUCCESS(status)) {
		obj_desc->device.gpe_block = NULL;
	}

unlock_and_exit:
	(void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE);
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_remove_gpe_block)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_gpe_device
 *
 * PARAMETERS:  index               - System GPE index (0-current_gpe_count)
 *              gpe_device          - Where the parent GPE Device is returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Obtain the GPE device associated with the input index. A NULL
 *              gpe device indicates that the gpe number is contained in one of
 *              the FADT-defined gpe blocks. Otherwise, the GPE block device.
 *
 ******************************************************************************/
acpi_status acpi_get_gpe_device(u32 index, acpi_handle *gpe_device)
{
	struct acpi_gpe_device_info info;
	acpi_status status;

	ACPI_FUNCTION_TRACE(acpi_get_gpe_device);

	if (!gpe_device) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (index >= acpi_current_gpe_count) {
		return_ACPI_STATUS(AE_NOT_EXIST);
	}

	/* Setup and walk the GPE list */

	info.index = index;
	info.status = AE_NOT_EXIST;
	info.gpe_device = NULL;
	info.next_block_base_index = 0;

	status = acpi_ev_walk_gpe_list(acpi_ev_get_gpe_device, &info);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	*gpe_device = ACPI_CAST_PTR(acpi_handle, info.gpe_device);
	return_ACPI_STATUS(info.status);
}

ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)
#endif				/* !ACPI_REDUCED_HARDWARE */