aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/acpi/acpica/evxfevnt.c
blob: 4721f58fe42c0653d6a6c14aee384ffbab2e708a (plain) (blame)
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
/******************************************************************************
 *
 * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2008, Intel Corp.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
 *    substantially similar to the "NO WARRANTY" disclaimer below
 *    ("Disclaimer") and any redistribution must be conditioned upon
 *    including a substantially similar Disclaimer requirement for further
 *    binary redistribution.
 * 3. Neither the names of the above-listed copyright holders nor the names
 *    of any contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * NO WARRANTY
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 */

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

#define _COMPONENT          ACPI_EVENTS
ACPI_MODULE_NAME("evxfevnt")

/* Local prototypes */
static acpi_status
acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
		       struct acpi_gpe_block_info *gpe_block, void *context);

/*******************************************************************************
 *
 * FUNCTION:    acpi_enable
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Transfers the system into ACPI mode.
 *
 ******************************************************************************/

acpi_status acpi_enable(void)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(acpi_enable);

	/* ACPI tables must be present */

	if (!acpi_tb_tables_loaded()) {
		return_ACPI_STATUS(AE_NO_ACPI_TABLES);
	}

	/* Check current mode */

	if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) {
		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "System is already in ACPI mode\n"));
	} else {
		/* Transition to ACPI mode */

		status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI);
		if (ACPI_FAILURE(status)) {
			ACPI_ERROR((AE_INFO,
				    "Could not transition to ACPI mode"));
			return_ACPI_STATUS(status);
		}

		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "Transition to ACPI mode successful\n"));
	}

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_enable)

/*******************************************************************************
 *
 * FUNCTION:    acpi_disable
 *
 * PARAMETERS:  None
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode.
 *
 ******************************************************************************/
acpi_status acpi_disable(void)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(acpi_disable);

	if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) {
		ACPI_DEBUG_PRINT((ACPI_DB_INIT,
				  "System is already in legacy (non-ACPI) mode\n"));
	} else {
		/* Transition to LEGACY mode */

		status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY);

		if (ACPI_FAILURE(status)) {
			ACPI_ERROR((AE_INFO,
				    "Could not exit ACPI mode to legacy mode"));
			return_ACPI_STATUS(status);
		}

		ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n"));
	}

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_disable)

/*******************************************************************************
 *
 * FUNCTION:    acpi_enable_event
 *
 * PARAMETERS:  Event           - The fixed eventto be enabled
 *              Flags           - Reserved
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable an ACPI event (fixed)
 *
 ******************************************************************************/
acpi_status acpi_enable_event(u32 event, u32 flags)
{
	acpi_status status = AE_OK;
	u32 value;

	ACPI_FUNCTION_TRACE(acpi_enable_event);

	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Enable the requested fixed event (by writing a one to the enable
	 * register bit)
	 */
	status =
	    acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
				    enable_register_id, ACPI_ENABLE_EVENT);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	/* Make sure that the hardware responded */

	status =
	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
				   enable_register_id, &value);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	if (value != 1) {
		ACPI_ERROR((AE_INFO,
			    "Could not enable %s event",
			    acpi_ut_get_event_name(event)));
		return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
	}

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_enable_event)

/*******************************************************************************
 *
 * FUNCTION:    acpi_set_gpe_type
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Type            - New GPE type
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Set the type of an individual GPE
 *
 ******************************************************************************/
acpi_status acpi_set_gpe_type(acpi_handle gpe_device, u32 gpe_number, u8 type)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;

	ACPI_FUNCTION_TRACE(acpi_set_gpe_type);

	/* 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 ((gpe_event_info->flags & ACPI_GPE_TYPE_MASK) == type) {
		return_ACPI_STATUS(AE_OK);
	}

	/* Set the new type (will disable GPE if currently enabled) */

	status = acpi_ev_set_gpe_type(gpe_event_info, type);

      unlock_and_exit:
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_set_gpe_type)

/*******************************************************************************
 *
 * FUNCTION:    acpi_enable_gpe
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Just enable, or also wake enable?
 *                                Called from ISR or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Enable an ACPI event (general purpose)
 *
 ******************************************************************************/
acpi_status acpi_enable_gpe(acpi_handle gpe_device, u32 gpe_number)
{
	acpi_status status = AE_OK;
	acpi_cpu_flags flags;
	struct acpi_gpe_event_info *gpe_event_info;

	ACPI_FUNCTION_TRACE(acpi_enable_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 enable */

	status = acpi_ev_enable_gpe(gpe_event_info, TRUE);

      unlock_and_exit:
	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
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Just disable, or also wake disable?
 *                                Called from ISR or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable an ACPI event (general purpose)
 *
 ******************************************************************************/
acpi_status acpi_disable_gpe(acpi_handle gpe_device, u32 gpe_number)
{
	acpi_status status = AE_OK;
	acpi_cpu_flags flags;
	struct acpi_gpe_event_info *gpe_event_info;

	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 = AE_BAD_PARAMETER;
		goto unlock_and_exit;
	}

	status = acpi_ev_disable_gpe(gpe_event_info);

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

ACPI_EXPORT_SYMBOL(acpi_disable_gpe)

/*******************************************************************************
 *
 * FUNCTION:    acpi_disable_event
 *
 * PARAMETERS:  Event           - The fixed eventto be enabled
 *              Flags           - Reserved
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Disable an ACPI event (fixed)
 *
 ******************************************************************************/
acpi_status acpi_disable_event(u32 event, u32 flags)
{
	acpi_status status = AE_OK;
	u32 value;

	ACPI_FUNCTION_TRACE(acpi_disable_event);

	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Disable the requested fixed event (by writing a zero to the enable
	 * register bit)
	 */
	status =
	    acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
				    enable_register_id, ACPI_DISABLE_EVENT);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	status =
	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
				   enable_register_id, &value);
	if (ACPI_FAILURE(status)) {
		return_ACPI_STATUS(status);
	}

	if (value != 0) {
		ACPI_ERROR((AE_INFO,
			    "Could not disable %s events",
			    acpi_ut_get_event_name(event)));
		return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
	}

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_disable_event)

/*******************************************************************************
 *
 * FUNCTION:    acpi_clear_event
 *
 * PARAMETERS:  Event           - The fixed event to be cleared
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear an ACPI event (fixed)
 *
 ******************************************************************************/
acpi_status acpi_clear_event(u32 event)
{
	acpi_status status = AE_OK;

	ACPI_FUNCTION_TRACE(acpi_clear_event);

	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/*
	 * Clear the requested fixed event (By writing a one to the status
	 * register bit)
	 */
	status =
	    acpi_write_bit_register(acpi_gbl_fixed_event_info[event].
				    status_register_id, ACPI_CLEAR_STATUS);

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_clear_event)

/*******************************************************************************
 *
 * FUNCTION:    acpi_clear_gpe
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Called from an ISR or not
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Clear an ACPI event (general purpose)
 *
 ******************************************************************************/
acpi_status acpi_clear_gpe(acpi_handle gpe_device, u32 gpe_number, u32 flags)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;

	ACPI_FUNCTION_TRACE(acpi_clear_gpe);

	/* Use semaphore lock if not executing at interrupt level */

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

	/* 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:
	if (flags & ACPI_NOT_ISR) {
		(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	}
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_clear_gpe)
/*******************************************************************************
 *
 * FUNCTION:    acpi_get_event_status
 *
 * PARAMETERS:  Event           - The fixed event
 *              event_status    - Where the current status of the event will
 *                                be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Obtains and returns the current status of the event
 *
 ******************************************************************************/
acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status)
{
	acpi_status status = AE_OK;
	u32 value;

	ACPI_FUNCTION_TRACE(acpi_get_event_status);

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

	/* Decode the Fixed Event */

	if (event > ACPI_EVENT_MAX) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	/* Get the status of the requested fixed event */

	status =
	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
			      enable_register_id, &value);
	if (ACPI_FAILURE(status))
		return_ACPI_STATUS(status);

	*event_status = value;

	status =
	    acpi_read_bit_register(acpi_gbl_fixed_event_info[event].
			      status_register_id, &value);
	if (ACPI_FAILURE(status))
		return_ACPI_STATUS(status);

	if (value)
		*event_status |= ACPI_EVENT_FLAG_SET;

	if (acpi_gbl_fixed_event_handlers[event].handler)
		*event_status |= ACPI_EVENT_FLAG_HANDLE;

	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_get_event_status)

/*******************************************************************************
 *
 * FUNCTION:    acpi_get_gpe_status
 *
 * PARAMETERS:  gpe_device      - Parent GPE Device
 *              gpe_number      - GPE level within the GPE block
 *              Flags           - Called from an ISR or not
 *              event_status    - Where the current status of the event will
 *                                be returned
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get status of an event (general purpose)
 *
 ******************************************************************************/
acpi_status
acpi_get_gpe_status(acpi_handle gpe_device,
		    u32 gpe_number, u32 flags, acpi_event_status * event_status)
{
	acpi_status status = AE_OK;
	struct acpi_gpe_event_info *gpe_event_info;

	ACPI_FUNCTION_TRACE(acpi_get_gpe_status);

	/* Use semaphore lock if not executing at interrupt level */

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

	/* 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);

	if (gpe_event_info->flags & ACPI_GPE_DISPATCH_MASK)
		*event_status |= ACPI_EVENT_FLAG_HANDLE;

      unlock_and_exit:
	if (flags & ACPI_NOT_ISR) {
		(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
	}
	return_ACPI_STATUS(status);
}

ACPI_EXPORT_SYMBOL(acpi_get_gpe_status)
/*******************************************************************************
 *
 * 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
 *
 ******************************************************************************/
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 (status);
	}

	node = acpi_ns_map_handle_to_node(gpe_device);
	if (!node) {
		status = AE_BAD_PARAMETER;
		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, register_count, 0,
				     interrupt_number, &gpe_block);
	if (ACPI_FAILURE(status)) {
		goto unlock_and_exit;
	}

	/* Run the _PRW methods and enable the GPEs */

	status = acpi_ev_initialize_gpe_block(node, gpe_block);
	if (ACPI_FAILURE(status)) {
		goto unlock_and_exit;
	}

	/* Get the device_object attached to the node */

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

		/* No object, create a new one */

		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;
		}
	}

	/* 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 (status);
	}

	node = acpi_ns_map_handle_to_node(gpe_device);
	if (!node) {
		status = AE_BAD_PARAMETER;
		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 = info.gpe_device;
	return_ACPI_STATUS(info.status);
}

ACPI_EXPORT_SYMBOL(acpi_get_gpe_device)

/*******************************************************************************
 *
 * FUNCTION:    acpi_ev_get_gpe_device
 *
 * PARAMETERS:  GPE_WALK_CALLBACK
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Matches the input GPE index (0-current_gpe_count) with a GPE
 *              block device. NULL if the GPE is one of the FADT-defined GPEs.
 *
 ******************************************************************************/
static acpi_status
acpi_ev_get_gpe_device(struct acpi_gpe_xrupt_info *gpe_xrupt_info,
		       struct acpi_gpe_block_info *gpe_block, void *context)
{
	struct acpi_gpe_device_info *info = context;

	/* Increment Index by the number of GPEs in this block */

	info->next_block_base_index +=
	    (gpe_block->register_count * ACPI_GPE_REGISTER_WIDTH);

	if (info->index < info->next_block_base_index) {
		/*
		 * The GPE index is within this block, get the node. Leave the node
		 * NULL for the FADT-defined GPEs
		 */
		if ((gpe_block->node)->type == ACPI_TYPE_DEVICE) {
			info->gpe_device = gpe_block->node;
		}

		info->status = AE_OK;
		return (AE_CTRL_END);
	}

	return (AE_OK);
}

/******************************************************************************
 *
 * 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);
}

/******************************************************************************
 *
 * 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);
}