summaryrefslogtreecommitdiffstats
path: root/drivers/gpio/gpiolib-acpi.c
blob: bda28eb82c3fadc70feed81beff1c540fe93d322 (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
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
// SPDX-License-Identifier: GPL-2.0
/*
 * ACPI helpers for GPIO API
 *
 * Copyright (C) 2012, Intel Corporation
 * Authors: Mathias Nyman <mathias.nyman@linux.intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 */

#include <linux/dmi.h>
#include <linux/errno.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/machine.h>
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/pinctrl/pinctrl.h>

#include "gpiolib.h"

static int run_edge_events_on_boot = -1;
module_param(run_edge_events_on_boot, int, 0444);
MODULE_PARM_DESC(run_edge_events_on_boot,
		 "Run edge _AEI event-handlers at boot: 0=no, 1=yes, -1=auto");

/**
 * struct acpi_gpio_event - ACPI GPIO event handler data
 *
 * @node:	  list-entry of the events list of the struct acpi_gpio_chip
 * @handle:	  handle of ACPI method to execute when the IRQ triggers
 * @handler:	  handler function to pass to request_irq() when requesting the IRQ
 * @pin:	  GPIO pin number on the struct gpio_chip
 * @irq:	  Linux IRQ number for the event, for request_irq() / free_irq()
 * @irqflags:	  flags to pass to request_irq() when requesting the IRQ
 * @irq_is_wake:  If the ACPI flags indicate the IRQ is a wakeup source
 * @irq_requested:True if request_irq() has been done
 * @desc:	  struct gpio_desc for the GPIO pin for this event
 */
struct acpi_gpio_event {
	struct list_head node;
	acpi_handle handle;
	irq_handler_t handler;
	unsigned int pin;
	unsigned int irq;
	unsigned long irqflags;
	bool irq_is_wake;
	bool irq_requested;
	struct gpio_desc *desc;
};

struct acpi_gpio_connection {
	struct list_head node;
	unsigned int pin;
	struct gpio_desc *desc;
};

struct acpi_gpio_chip {
	/*
	 * ACPICA requires that the first field of the context parameter
	 * passed to acpi_install_address_space_handler() is large enough
	 * to hold struct acpi_connection_info.
	 */
	struct acpi_connection_info conn_info;
	struct list_head conns;
	struct mutex conn_lock;
	struct gpio_chip *chip;
	struct list_head events;
	struct list_head deferred_req_irqs_list_entry;
};

/*
 * For GPIO chips which call acpi_gpiochip_request_interrupts() before late_init
 * (so builtin drivers) we register the ACPI GpioInt IRQ handlers from a
 * late_initcall_sync() handler, so that other builtin drivers can register their
 * OpRegions before the event handlers can run. This list contains GPIO chips
 * for which the acpi_gpiochip_request_irqs() call has been deferred.
 */
static DEFINE_MUTEX(acpi_gpio_deferred_req_irqs_lock);
static LIST_HEAD(acpi_gpio_deferred_req_irqs_list);
static bool acpi_gpio_deferred_req_irqs_done;

static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
{
	if (!gc->parent)
		return false;

	return ACPI_HANDLE(gc->parent) == data;
}

/**
 * acpi_get_gpiod() - Translate ACPI GPIO pin to GPIO descriptor usable with GPIO API
 * @path:	ACPI GPIO controller full path name, (e.g. "\\_SB.GPO1")
 * @pin:	ACPI GPIO pin number (0-based, controller-relative)
 *
 * Return: GPIO descriptor to use with Linux generic GPIO API, or ERR_PTR
 * error value. Specifically returns %-EPROBE_DEFER if the referenced GPIO
 * controller does not have GPIO chip registered at the moment. This is to
 * support probe deferral.
 */
static struct gpio_desc *acpi_get_gpiod(char *path, int pin)
{
	struct gpio_chip *chip;
	acpi_handle handle;
	acpi_status status;

	status = acpi_get_handle(NULL, path, &handle);
	if (ACPI_FAILURE(status))
		return ERR_PTR(-ENODEV);

	chip = gpiochip_find(handle, acpi_gpiochip_find);
	if (!chip)
		return ERR_PTR(-EPROBE_DEFER);

	return gpiochip_get_desc(chip, pin);
}

static irqreturn_t acpi_gpio_irq_handler(int irq, void *data)
{
	struct acpi_gpio_event *event = data;

	acpi_evaluate_object(event->handle, NULL, NULL, NULL);

	return IRQ_HANDLED;
}

static irqreturn_t acpi_gpio_irq_handler_evt(int irq, void *data)
{
	struct acpi_gpio_event *event = data;

	acpi_execute_simple_method(event->handle, NULL, event->pin);

	return IRQ_HANDLED;
}

static void acpi_gpio_chip_dh(acpi_handle handle, void *data)
{
	/* The address of this function is used as a key. */
}

bool acpi_gpio_get_irq_resource(struct acpi_resource *ares,
				struct acpi_resource_gpio **agpio)
{
	struct acpi_resource_gpio *gpio;

	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
		return false;

	gpio = &ares->data.gpio;
	if (gpio->connection_type != ACPI_RESOURCE_GPIO_TYPE_INT)
		return false;

	*agpio = gpio;
	return true;
}
EXPORT_SYMBOL_GPL(acpi_gpio_get_irq_resource);

static void acpi_gpiochip_request_irq(struct acpi_gpio_chip *acpi_gpio,
				      struct acpi_gpio_event *event)
{
	int ret, value;

	ret = request_threaded_irq(event->irq, NULL, event->handler,
				   event->irqflags, "ACPI:Event", event);
	if (ret) {
		dev_err(acpi_gpio->chip->parent,
			"Failed to setup interrupt handler for %d\n",
			event->irq);
		return;
	}

	if (event->irq_is_wake)
		enable_irq_wake(event->irq);

	event->irq_requested = true;

	/* Make sure we trigger the initial state of edge-triggered IRQs */
	if (run_edge_events_on_boot &&
	    (event->irqflags & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))) {
		value = gpiod_get_raw_value_cansleep(event->desc);
		if (((event->irqflags & IRQF_TRIGGER_RISING) && value == 1) ||
		    ((event->irqflags & IRQF_TRIGGER_FALLING) && value == 0))
			event->handler(event->irq, event);
	}
}

static void acpi_gpiochip_request_irqs(struct acpi_gpio_chip *acpi_gpio)
{
	struct acpi_gpio_event *event;

	list_for_each_entry(event, &acpi_gpio->events, node)
		acpi_gpiochip_request_irq(acpi_gpio, event);
}

static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
					     void *context)
{
	struct acpi_gpio_chip *acpi_gpio = context;
	struct gpio_chip *chip = acpi_gpio->chip;
	struct acpi_resource_gpio *agpio;
	acpi_handle handle, evt_handle;
	struct acpi_gpio_event *event;
	irq_handler_t handler = NULL;
	struct gpio_desc *desc;
	int ret, pin, irq;

	if (!acpi_gpio_get_irq_resource(ares, &agpio))
		return AE_OK;

	handle = ACPI_HANDLE(chip->parent);
	pin = agpio->pin_table[0];

	if (pin <= 255) {
		char ev_name[5];
		sprintf(ev_name, "_%c%02hhX",
			agpio->triggering == ACPI_EDGE_SENSITIVE ? 'E' : 'L',
			pin);
		if (ACPI_SUCCESS(acpi_get_handle(handle, ev_name, &evt_handle)))
			handler = acpi_gpio_irq_handler;
	}
	if (!handler) {
		if (ACPI_SUCCESS(acpi_get_handle(handle, "_EVT", &evt_handle)))
			handler = acpi_gpio_irq_handler_evt;
	}
	if (!handler)
		return AE_OK;

	desc = gpiochip_request_own_desc(chip, pin, "ACPI:Event",
					 GPIO_ACTIVE_HIGH, GPIOD_IN);
	if (IS_ERR(desc)) {
		dev_err(chip->parent, "Failed to request GPIO\n");
		return AE_ERROR;
	}

	ret = gpiochip_lock_as_irq(chip, pin);
	if (ret) {
		dev_err(chip->parent, "Failed to lock GPIO as interrupt\n");
		goto fail_free_desc;
	}

	irq = gpiod_to_irq(desc);
	if (irq < 0) {
		dev_err(chip->parent, "Failed to translate GPIO to IRQ\n");
		goto fail_unlock_irq;
	}

	event = kzalloc(sizeof(*event), GFP_KERNEL);
	if (!event)
		goto fail_unlock_irq;

	event->irqflags = IRQF_ONESHOT;
	if (agpio->triggering == ACPI_LEVEL_SENSITIVE) {
		if (agpio->polarity == ACPI_ACTIVE_HIGH)
			event->irqflags |= IRQF_TRIGGER_HIGH;
		else
			event->irqflags |= IRQF_TRIGGER_LOW;
	} else {
		switch (agpio->polarity) {
		case ACPI_ACTIVE_HIGH:
			event->irqflags |= IRQF_TRIGGER_RISING;
			break;
		case ACPI_ACTIVE_LOW:
			event->irqflags |= IRQF_TRIGGER_FALLING;
			break;
		default:
			event->irqflags |= IRQF_TRIGGER_RISING |
					   IRQF_TRIGGER_FALLING;
			break;
		}
	}

	event->handle = evt_handle;
	event->handler = handler;
	event->irq = irq;
	event->irq_is_wake = agpio->wake_capable == ACPI_WAKE_CAPABLE;
	event->pin = pin;
	event->desc = desc;

	list_add_tail(&event->node, &acpi_gpio->events);

	return AE_OK;

fail_unlock_irq:
	gpiochip_unlock_as_irq(chip, pin);
fail_free_desc:
	gpiochip_free_own_desc(desc);

	return AE_ERROR;
}

/**
 * acpi_gpiochip_request_interrupts() - Register isr for gpio chip ACPI events
 * @chip:      GPIO chip
 *
 * ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are
 * handled by ACPI event methods which need to be called from the GPIO
 * chip's interrupt handler. acpi_gpiochip_request_interrupts() finds out which
 * GPIO pins have ACPI event methods and assigns interrupt handlers that calls
 * the ACPI event methods for those pins.
 */
void acpi_gpiochip_request_interrupts(struct gpio_chip *chip)
{
	struct acpi_gpio_chip *acpi_gpio;
	acpi_handle handle;
	acpi_status status;
	bool defer;

	if (!chip->parent || !chip->to_irq)
		return;

	handle = ACPI_HANDLE(chip->parent);
	if (!handle)
		return;

	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
	if (ACPI_FAILURE(status))
		return;

	acpi_walk_resources(handle, "_AEI",
			    acpi_gpiochip_alloc_event, acpi_gpio);

	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
	defer = !acpi_gpio_deferred_req_irqs_done;
	if (defer)
		list_add(&acpi_gpio->deferred_req_irqs_list_entry,
			 &acpi_gpio_deferred_req_irqs_list);
	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);

	if (defer)
		return;

	acpi_gpiochip_request_irqs(acpi_gpio);
}
EXPORT_SYMBOL_GPL(acpi_gpiochip_request_interrupts);

/**
 * acpi_gpiochip_free_interrupts() - Free GPIO ACPI event interrupts.
 * @chip:      GPIO chip
 *
 * Free interrupts associated with GPIO ACPI event method for the given
 * GPIO chip.
 */
void acpi_gpiochip_free_interrupts(struct gpio_chip *chip)
{
	struct acpi_gpio_chip *acpi_gpio;
	struct acpi_gpio_event *event, *ep;
	acpi_handle handle;
	acpi_status status;

	if (!chip->parent || !chip->to_irq)
		return;

	handle = ACPI_HANDLE(chip->parent);
	if (!handle)
		return;

	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
	if (ACPI_FAILURE(status))
		return;

	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
	if (!list_empty(&acpi_gpio->deferred_req_irqs_list_entry))
		list_del_init(&acpi_gpio->deferred_req_irqs_list_entry);
	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);

	list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
		if (event->irq_requested) {
			if (event->irq_is_wake)
				disable_irq_wake(event->irq);

			free_irq(event->irq, event);
		}

		gpiochip_unlock_as_irq(chip, event->pin);
		gpiochip_free_own_desc(event->desc);
		list_del(&event->node);
		kfree(event);
	}
}
EXPORT_SYMBOL_GPL(acpi_gpiochip_free_interrupts);

int acpi_dev_add_driver_gpios(struct acpi_device *adev,
			      const struct acpi_gpio_mapping *gpios)
{
	if (adev && gpios) {
		adev->driver_gpios = gpios;
		return 0;
	}
	return -EINVAL;
}
EXPORT_SYMBOL_GPL(acpi_dev_add_driver_gpios);

static void devm_acpi_dev_release_driver_gpios(struct device *dev, void *res)
{
	acpi_dev_remove_driver_gpios(ACPI_COMPANION(dev));
}

int devm_acpi_dev_add_driver_gpios(struct device *dev,
				   const struct acpi_gpio_mapping *gpios)
{
	void *res;
	int ret;

	res = devres_alloc(devm_acpi_dev_release_driver_gpios, 0, GFP_KERNEL);
	if (!res)
		return -ENOMEM;

	ret = acpi_dev_add_driver_gpios(ACPI_COMPANION(dev), gpios);
	if (ret) {
		devres_free(res);
		return ret;
	}
	devres_add(dev, res);
	return 0;
}
EXPORT_SYMBOL_GPL(devm_acpi_dev_add_driver_gpios);

void devm_acpi_dev_remove_driver_gpios(struct device *dev)
{
	WARN_ON(devres_release(dev, devm_acpi_dev_release_driver_gpios, NULL, NULL));
}
EXPORT_SYMBOL_GPL(devm_acpi_dev_remove_driver_gpios);

static bool acpi_get_driver_gpio_data(struct acpi_device *adev,
				      const char *name, int index,
				      struct fwnode_reference_args *args,
				      unsigned int *quirks)
{
	const struct acpi_gpio_mapping *gm;

	if (!adev->driver_gpios)
		return false;

	for (gm = adev->driver_gpios; gm->name; gm++)
		if (!strcmp(name, gm->name) && gm->data && index < gm->size) {
			const struct acpi_gpio_params *par = gm->data + index;

			args->fwnode = acpi_fwnode_handle(adev);
			args->args[0] = par->crs_entry_index;
			args->args[1] = par->line_index;
			args->args[2] = par->active_low;
			args->nargs = 3;

			*quirks = gm->quirks;
			return true;
		}

	return false;
}

static enum gpiod_flags
acpi_gpio_to_gpiod_flags(const struct acpi_resource_gpio *agpio)
{
	switch (agpio->io_restriction) {
	case ACPI_IO_RESTRICT_INPUT:
		return GPIOD_IN;
	case ACPI_IO_RESTRICT_OUTPUT:
		/*
		 * ACPI GPIO resources don't contain an initial value for the
		 * GPIO. Therefore we deduce that value from the pull field
		 * instead. If the pin is pulled up we assume default to be
		 * high, if it is pulled down we assume default to be low,
		 * otherwise we leave pin untouched.
		 */
		switch (agpio->pin_config) {
		case ACPI_PIN_CONFIG_PULLUP:
			return GPIOD_OUT_HIGH;
		case ACPI_PIN_CONFIG_PULLDOWN:
			return GPIOD_OUT_LOW;
		default:
			break;
		}
	default:
		break;
	}

	/*
	 * Assume that the BIOS has configured the direction and pull
	 * accordingly.
	 */
	return GPIOD_ASIS;
}

static int
__acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, enum gpiod_flags update)
{
	const enum gpiod_flags mask =
		GPIOD_FLAGS_BIT_DIR_SET | GPIOD_FLAGS_BIT_DIR_OUT |
		GPIOD_FLAGS_BIT_DIR_VAL;
	int ret = 0;

	/*
	 * Check if the BIOS has IoRestriction with explicitly set direction
	 * and update @flags accordingly. Otherwise use whatever caller asked
	 * for.
	 */
	if (update & GPIOD_FLAGS_BIT_DIR_SET) {
		enum gpiod_flags diff = *flags ^ update;

		/*
		 * Check if caller supplied incompatible GPIO initialization
		 * flags.
		 *
		 * Return %-EINVAL to notify that firmware has different
		 * settings and we are going to use them.
		 */
		if (((*flags & GPIOD_FLAGS_BIT_DIR_SET) && (diff & GPIOD_FLAGS_BIT_DIR_OUT)) ||
		    ((*flags & GPIOD_FLAGS_BIT_DIR_OUT) && (diff & GPIOD_FLAGS_BIT_DIR_VAL)))
			ret = -EINVAL;
		*flags = (*flags & ~mask) | (update & mask);
	}
	return ret;
}

int
acpi_gpio_update_gpiod_flags(enum gpiod_flags *flags, struct acpi_gpio_info *info)
{
	struct device *dev = &info->adev->dev;
	enum gpiod_flags old = *flags;
	int ret;

	ret = __acpi_gpio_update_gpiod_flags(&old, info->flags);
	if (info->quirks & ACPI_GPIO_QUIRK_NO_IO_RESTRICTION) {
		if (ret)
			dev_warn(dev, FW_BUG "GPIO not in correct mode, fixing\n");
	} else {
		if (ret)
			dev_dbg(dev, "Override GPIO initialization flags\n");
		*flags = old;
	}

	return ret;
}

int acpi_gpio_update_gpiod_lookup_flags(unsigned long *lookupflags,
					struct acpi_gpio_info *info)
{
	switch (info->pin_config) {
	case ACPI_PIN_CONFIG_PULLUP:
		*lookupflags |= GPIO_PULL_UP;
		break;
	case ACPI_PIN_CONFIG_PULLDOWN:
		*lookupflags |= GPIO_PULL_DOWN;
		break;
	default:
		break;
	}

	if (info->polarity == GPIO_ACTIVE_LOW)
		*lookupflags |= GPIO_ACTIVE_LOW;

	return 0;
}

struct acpi_gpio_lookup {
	struct acpi_gpio_info info;
	int index;
	int pin_index;
	bool active_low;
	struct gpio_desc *desc;
	int n;
};

static int acpi_populate_gpio_lookup(struct acpi_resource *ares, void *data)
{
	struct acpi_gpio_lookup *lookup = data;

	if (ares->type != ACPI_RESOURCE_TYPE_GPIO)
		return 1;

	if (!lookup->desc) {
		const struct acpi_resource_gpio *agpio = &ares->data.gpio;
		bool gpioint = agpio->connection_type == ACPI_RESOURCE_GPIO_TYPE_INT;
		int pin_index;

		if (lookup->info.quirks & ACPI_GPIO_QUIRK_ONLY_GPIOIO && gpioint)
			lookup->index++;

		if (lookup->n++ != lookup->index)
			return 1;

		pin_index = lookup->pin_index;
		if (pin_index >= agpio->pin_table_length)
			return 1;

		lookup->desc = acpi_get_gpiod(agpio->resource_source.string_ptr,
					      agpio->pin_table[pin_index]);
		lookup->info.pin_config = agpio->pin_config;
		lookup->info.gpioint = gpioint;

		/*
		 * Polarity and triggering are only specified for GpioInt
		 * resource.
		 * Note: we expect here:
		 * - ACPI_ACTIVE_LOW == GPIO_ACTIVE_LOW
		 * - ACPI_ACTIVE_HIGH == GPIO_ACTIVE_HIGH
		 */
		if (lookup->info.gpioint) {
			lookup->info.flags = GPIOD_IN;
			lookup->info.polarity = agpio->polarity;
			lookup->info.triggering = agpio->triggering;
		} else {
			lookup->info.flags = acpi_gpio_to_gpiod_flags(agpio);
			lookup->info.polarity = lookup->active_low;
		}
	}

	return 1;
}

static int acpi_gpio_resource_lookup(struct acpi_gpio_lookup *lookup,
				     struct acpi_gpio_info *info)
{
	struct acpi_device *adev = lookup->info.adev;
	struct list_head res_list;
	int ret;

	INIT_LIST_HEAD(&res_list);

	ret = acpi_dev_get_resources(adev, &res_list,
				     acpi_populate_gpio_lookup,
				     lookup);
	if (ret < 0)
		return ret;

	acpi_dev_free_resource_list(&res_list);

	if (!lookup->desc)
		return -ENOENT;

	if (info)
		*info = lookup->info;
	return 0;
}

static int acpi_gpio_property_lookup(struct fwnode_handle *fwnode,
				     const char *propname, int index,
				     struct acpi_gpio_lookup *lookup)
{
	struct fwnode_reference_args args;
	unsigned int quirks = 0;
	int ret;

	memset(&args, 0, sizeof(args));
	ret = __acpi_node_get_property_reference(fwnode, propname, index, 3,
						 &args);
	if (ret) {
		struct acpi_device *adev = to_acpi_device_node(fwnode);

		if (!adev)
			return ret;

		if (!acpi_get_driver_gpio_data(adev, propname, index, &args,
					       &quirks))
			return ret;
	}
	/*
	 * The property was found and resolved, so need to lookup the GPIO based
	 * on returned args.
	 */
	if (!to_acpi_device_node(args.fwnode))
		return -EINVAL;
	if (args.nargs != 3)
		return -EPROTO;

	lookup->index = args.args[0];
	lookup->pin_index = args.args[1];
	lookup->active_low = !!args.args[2];

	lookup->info.adev = to_acpi_device_node(args.fwnode);
	lookup->info.quirks = quirks;

	return 0;
}

/**
 * acpi_get_gpiod_by_index() - get a GPIO descriptor from device resources
 * @adev: pointer to a ACPI device to get GPIO from
 * @propname: Property name of the GPIO (optional)
 * @index: index of GpioIo/GpioInt resource (starting from %0)
 * @info: info pointer to fill in (optional)
 *
 * Function goes through ACPI resources for @adev and based on @index looks
 * up a GpioIo/GpioInt resource, translates it to the Linux GPIO descriptor,
 * and returns it. @index matches GpioIo/GpioInt resources only so if there
 * are total %3 GPIO resources, the index goes from %0 to %2.
 *
 * If @propname is specified the GPIO is looked using device property. In
 * that case @index is used to select the GPIO entry in the property value
 * (in case of multiple).
 *
 * If the GPIO cannot be translated or there is an error, an ERR_PTR is
 * returned.
 *
 * Note: if the GPIO resource has multiple entries in the pin list, this
 * function only returns the first.
 */
static struct gpio_desc *acpi_get_gpiod_by_index(struct acpi_device *adev,
					  const char *propname, int index,
					  struct acpi_gpio_info *info)
{
	struct acpi_gpio_lookup lookup;
	int ret;

	if (!adev)
		return ERR_PTR(-ENODEV);

	memset(&lookup, 0, sizeof(lookup));
	lookup.index = index;

	if (propname) {
		dev_dbg(&adev->dev, "GPIO: looking up %s\n", propname);

		ret = acpi_gpio_property_lookup(acpi_fwnode_handle(adev),
						propname, index, &lookup);
		if (ret)
			return ERR_PTR(ret);

		dev_dbg(&adev->dev, "GPIO: _DSD returned %s %d %d %u\n",
			dev_name(&lookup.info.adev->dev), lookup.index,
			lookup.pin_index, lookup.active_low);
	} else {
		dev_dbg(&adev->dev, "GPIO: looking up %d in _CRS\n", index);
		lookup.info.adev = adev;
	}

	ret = acpi_gpio_resource_lookup(&lookup, info);
	return ret ? ERR_PTR(ret) : lookup.desc;
}

struct gpio_desc *acpi_find_gpio(struct device *dev,
				 const char *con_id,
				 unsigned int idx,
				 enum gpiod_flags *dflags,
				 unsigned long *lookupflags)
{
	struct acpi_device *adev = ACPI_COMPANION(dev);
	struct acpi_gpio_info info;
	struct gpio_desc *desc;
	char propname[32];
	int i;

	/* Try first from _DSD */
	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
		if (con_id) {
			snprintf(propname, sizeof(propname), "%s-%s",
				 con_id, gpio_suffixes[i]);
		} else {
			snprintf(propname, sizeof(propname), "%s",
				 gpio_suffixes[i]);
		}

		desc = acpi_get_gpiod_by_index(adev, propname, idx, &info);
		if (!IS_ERR(desc))
			break;
		if (PTR_ERR(desc) == -EPROBE_DEFER)
			return ERR_CAST(desc);
	}

	/* Then from plain _CRS GPIOs */
	if (IS_ERR(desc)) {
		if (!acpi_can_fallback_to_crs(adev, con_id))
			return ERR_PTR(-ENOENT);

		desc = acpi_get_gpiod_by_index(adev, NULL, idx, &info);
		if (IS_ERR(desc))
			return desc;
	}

	if (info.gpioint &&
	    (*dflags == GPIOD_OUT_LOW || *dflags == GPIOD_OUT_HIGH)) {
		dev_dbg(dev, "refusing GpioInt() entry when doing GPIOD_OUT_* lookup\n");
		return ERR_PTR(-ENOENT);
	}

	acpi_gpio_update_gpiod_flags(dflags, &info);
	acpi_gpio_update_gpiod_lookup_flags(lookupflags, &info);
	return desc;
}

/**
 * acpi_node_get_gpiod() - get a GPIO descriptor from ACPI resources
 * @fwnode: pointer to an ACPI firmware node to get the GPIO information from
 * @propname: Property name of the GPIO
 * @index: index of GpioIo/GpioInt resource (starting from %0)
 * @info: info pointer to fill in (optional)
 *
 * If @fwnode is an ACPI device object, call acpi_get_gpiod_by_index() for it.
 * Otherwise (i.e. it is a data-only non-device object), use the property-based
 * GPIO lookup to get to the GPIO resource with the relevant information and use
 * that to obtain the GPIO descriptor to return.
 *
 * If the GPIO cannot be translated or there is an error an ERR_PTR is
 * returned.
 */
struct gpio_desc *acpi_node_get_gpiod(struct fwnode_handle *fwnode,
				      const char *propname, int index,
				      struct acpi_gpio_info *info)
{
	struct acpi_gpio_lookup lookup;
	struct acpi_device *adev;
	int ret;

	adev = to_acpi_device_node(fwnode);
	if (adev)
		return acpi_get_gpiod_by_index(adev, propname, index, info);

	if (!is_acpi_data_node(fwnode))
		return ERR_PTR(-ENODEV);

	if (!propname)
		return ERR_PTR(-EINVAL);

	memset(&lookup, 0, sizeof(lookup));
	lookup.index = index;

	ret = acpi_gpio_property_lookup(fwnode, propname, index, &lookup);
	if (ret)
		return ERR_PTR(ret);

	ret = acpi_gpio_resource_lookup(&lookup, info);
	return ret ? ERR_PTR(ret) : lookup.desc;
}

/**
 * acpi_dev_gpio_irq_get() - Find GpioInt and translate it to Linux IRQ number
 * @adev: pointer to a ACPI device to get IRQ from
 * @index: index of GpioInt resource (starting from %0)
 *
 * If the device has one or more GpioInt resources, this function can be
 * used to translate from the GPIO offset in the resource to the Linux IRQ
 * number.
 *
 * The function is idempotent, though each time it runs it will configure GPIO
 * pin direction according to the flags in GpioInt resource.
 *
 * Return: Linux IRQ number (> %0) on success, negative errno on failure.
 */
int acpi_dev_gpio_irq_get(struct acpi_device *adev, int index)
{
	int idx, i;
	unsigned int irq_flags;
	int ret;

	for (i = 0, idx = 0; idx <= index; i++) {
		struct acpi_gpio_info info;
		struct gpio_desc *desc;

		desc = acpi_get_gpiod_by_index(adev, NULL, i, &info);

		/* Ignore -EPROBE_DEFER, it only matters if idx matches */
		if (IS_ERR(desc) && PTR_ERR(desc) != -EPROBE_DEFER)
			return PTR_ERR(desc);

		if (info.gpioint && idx++ == index) {
			unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
			char label[32];
			int irq;

			if (IS_ERR(desc))
				return PTR_ERR(desc);

			irq = gpiod_to_irq(desc);
			if (irq < 0)
				return irq;

			snprintf(label, sizeof(label), "GpioInt() %d", index);
			ret = gpiod_configure_flags(desc, label, lflags, info.flags);
			if (ret < 0)
				return ret;

			irq_flags = acpi_dev_get_irq_type(info.triggering,
							  info.polarity);

			/* Set type if specified and different than the current one */
			if (irq_flags != IRQ_TYPE_NONE &&
			    irq_flags != irq_get_trigger_type(irq))
				irq_set_irq_type(irq, irq_flags);

			return irq;
		}

	}
	return -ENOENT;
}
EXPORT_SYMBOL_GPL(acpi_dev_gpio_irq_get);

static acpi_status
acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
			    u32 bits, u64 *value, void *handler_context,
			    void *region_context)
{
	struct acpi_gpio_chip *achip = region_context;
	struct gpio_chip *chip = achip->chip;
	struct acpi_resource_gpio *agpio;
	struct acpi_resource *ares;
	int pin_index = (int)address;
	acpi_status status;
	int length;
	int i;

	status = acpi_buffer_to_resource(achip->conn_info.connection,
					 achip->conn_info.length, &ares);
	if (ACPI_FAILURE(status))
		return status;

	if (WARN_ON(ares->type != ACPI_RESOURCE_TYPE_GPIO)) {
		ACPI_FREE(ares);
		return AE_BAD_PARAMETER;
	}

	agpio = &ares->data.gpio;

	if (WARN_ON(agpio->io_restriction == ACPI_IO_RESTRICT_INPUT &&
	    function == ACPI_WRITE)) {
		ACPI_FREE(ares);
		return AE_BAD_PARAMETER;
	}

	length = min(agpio->pin_table_length, (u16)(pin_index + bits));
	for (i = pin_index; i < length; ++i) {
		int pin = agpio->pin_table[i];
		struct acpi_gpio_connection *conn;
		struct gpio_desc *desc;
		bool found;

		mutex_lock(&achip->conn_lock);

		found = false;
		list_for_each_entry(conn, &achip->conns, node) {
			if (conn->pin == pin) {
				found = true;
				desc = conn->desc;
				break;
			}
		}

		/*
		 * The same GPIO can be shared between operation region and
		 * event but only if the access here is ACPI_READ. In that
		 * case we "borrow" the event GPIO instead.
		 */
		if (!found && agpio->shareable == ACPI_SHARED &&
		     function == ACPI_READ) {
			struct acpi_gpio_event *event;

			list_for_each_entry(event, &achip->events, node) {
				if (event->pin == pin) {
					desc = event->desc;
					found = true;
					break;
				}
			}
		}

		if (!found) {
			enum gpiod_flags flags = acpi_gpio_to_gpiod_flags(agpio);
			const char *label = "ACPI:OpRegion";

			desc = gpiochip_request_own_desc(chip, pin, label,
							 GPIO_ACTIVE_HIGH,
							 flags);
			if (IS_ERR(desc)) {
				status = AE_ERROR;
				mutex_unlock(&achip->conn_lock);
				goto out;
			}

			conn = kzalloc(sizeof(*conn), GFP_KERNEL);
			if (!conn) {
				status = AE_NO_MEMORY;
				gpiochip_free_own_desc(desc);
				mutex_unlock(&achip->conn_lock);
				goto out;
			}

			conn->pin = pin;
			conn->desc = desc;
			list_add_tail(&conn->node, &achip->conns);
		}

		mutex_unlock(&achip->conn_lock);

		if (function == ACPI_WRITE)
			gpiod_set_raw_value_cansleep(desc,
						     !!((1 << i) & *value));
		else
			*value |= (u64)gpiod_get_raw_value_cansleep(desc) << i;
	}

out:
	ACPI_FREE(ares);
	return status;
}

static void acpi_gpiochip_request_regions(struct acpi_gpio_chip *achip)
{
	struct gpio_chip *chip = achip->chip;
	acpi_handle handle = ACPI_HANDLE(chip->parent);
	acpi_status status;

	INIT_LIST_HEAD(&achip->conns);
	mutex_init(&achip->conn_lock);
	status = acpi_install_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
						    acpi_gpio_adr_space_handler,
						    NULL, achip);
	if (ACPI_FAILURE(status))
		dev_err(chip->parent,
		        "Failed to install GPIO OpRegion handler\n");
}

static void acpi_gpiochip_free_regions(struct acpi_gpio_chip *achip)
{
	struct gpio_chip *chip = achip->chip;
	acpi_handle handle = ACPI_HANDLE(chip->parent);
	struct acpi_gpio_connection *conn, *tmp;
	acpi_status status;

	status = acpi_remove_address_space_handler(handle, ACPI_ADR_SPACE_GPIO,
						   acpi_gpio_adr_space_handler);
	if (ACPI_FAILURE(status)) {
		dev_err(chip->parent,
			"Failed to remove GPIO OpRegion handler\n");
		return;
	}

	list_for_each_entry_safe_reverse(conn, tmp, &achip->conns, node) {
		gpiochip_free_own_desc(conn->desc);
		list_del(&conn->node);
		kfree(conn);
	}
}

static struct gpio_desc *
acpi_gpiochip_parse_own_gpio(struct acpi_gpio_chip *achip,
			     struct fwnode_handle *fwnode,
			     const char **name,
			     unsigned long *lflags,
			     enum gpiod_flags *dflags)
{
	struct gpio_chip *chip = achip->chip;
	struct gpio_desc *desc;
	u32 gpios[2];
	int ret;

	*lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
	*dflags = 0;
	*name = NULL;

	ret = fwnode_property_read_u32_array(fwnode, "gpios", gpios,
					     ARRAY_SIZE(gpios));
	if (ret < 0)
		return ERR_PTR(ret);

	desc = gpiochip_get_desc(chip, gpios[0]);
	if (IS_ERR(desc))
		return desc;

	if (gpios[1])
		*lflags |= GPIO_ACTIVE_LOW;

	if (fwnode_property_present(fwnode, "input"))
		*dflags |= GPIOD_IN;
	else if (fwnode_property_present(fwnode, "output-low"))
		*dflags |= GPIOD_OUT_LOW;
	else if (fwnode_property_present(fwnode, "output-high"))
		*dflags |= GPIOD_OUT_HIGH;
	else
		return ERR_PTR(-EINVAL);

	fwnode_property_read_string(fwnode, "line-name", name);

	return desc;
}

static void acpi_gpiochip_scan_gpios(struct acpi_gpio_chip *achip)
{
	struct gpio_chip *chip = achip->chip;
	struct fwnode_handle *fwnode;

	device_for_each_child_node(chip->parent, fwnode) {
		unsigned long lflags;
		enum gpiod_flags dflags;
		struct gpio_desc *desc;
		const char *name;
		int ret;

		if (!fwnode_property_present(fwnode, "gpio-hog"))
			continue;

		desc = acpi_gpiochip_parse_own_gpio(achip, fwnode, &name,
						    &lflags, &dflags);
		if (IS_ERR(desc))
			continue;

		ret = gpiod_hog(desc, name, lflags, dflags);
		if (ret) {
			dev_err(chip->parent, "Failed to hog GPIO\n");
			fwnode_handle_put(fwnode);
			return;
		}
	}
}

void acpi_gpiochip_add(struct gpio_chip *chip)
{
	struct acpi_gpio_chip *acpi_gpio;
	acpi_handle handle;
	acpi_status status;

	if (!chip || !chip->parent)
		return;

	handle = ACPI_HANDLE(chip->parent);
	if (!handle)
		return;

	acpi_gpio = kzalloc(sizeof(*acpi_gpio), GFP_KERNEL);
	if (!acpi_gpio) {
		dev_err(chip->parent,
			"Failed to allocate memory for ACPI GPIO chip\n");
		return;
	}

	acpi_gpio->chip = chip;
	INIT_LIST_HEAD(&acpi_gpio->events);
	INIT_LIST_HEAD(&acpi_gpio->deferred_req_irqs_list_entry);

	status = acpi_attach_data(handle, acpi_gpio_chip_dh, acpi_gpio);
	if (ACPI_FAILURE(status)) {
		dev_err(chip->parent, "Failed to attach ACPI GPIO chip\n");
		kfree(acpi_gpio);
		return;
	}

	if (!chip->names)
		devprop_gpiochip_set_names(chip, dev_fwnode(chip->parent));

	acpi_gpiochip_request_regions(acpi_gpio);
	acpi_gpiochip_scan_gpios(acpi_gpio);
	acpi_walk_dep_device_list(handle);
}

void acpi_gpiochip_remove(struct gpio_chip *chip)
{
	struct acpi_gpio_chip *acpi_gpio;
	acpi_handle handle;
	acpi_status status;

	if (!chip || !chip->parent)
		return;

	handle = ACPI_HANDLE(chip->parent);
	if (!handle)
		return;

	status = acpi_get_data(handle, acpi_gpio_chip_dh, (void **)&acpi_gpio);
	if (ACPI_FAILURE(status)) {
		dev_warn(chip->parent, "Failed to retrieve ACPI GPIO chip\n");
		return;
	}

	acpi_gpiochip_free_regions(acpi_gpio);

	acpi_detach_data(handle, acpi_gpio_chip_dh);
	kfree(acpi_gpio);
}

static int acpi_gpio_package_count(const union acpi_object *obj)
{
	const union acpi_object *element = obj->package.elements;
	const union acpi_object *end = element + obj->package.count;
	unsigned int count = 0;

	while (element < end) {
		switch (element->type) {
		case ACPI_TYPE_LOCAL_REFERENCE:
			element += 3;
			/* Fallthrough */
		case ACPI_TYPE_INTEGER:
			element++;
			count++;
			break;

		default:
			return -EPROTO;
		}
	}

	return count;
}

static int acpi_find_gpio_count(struct acpi_resource *ares, void *data)
{
	unsigned int *count = data;

	if (ares->type == ACPI_RESOURCE_TYPE_GPIO)
		*count += ares->data.gpio.pin_table_length;

	return 1;
}

/**
 * acpi_gpio_count - count the GPIOs associated with a device / function
 * @dev:	GPIO consumer, can be %NULL for system-global GPIOs
 * @con_id:	function within the GPIO consumer
 *
 * Return:
 * The number of GPIOs associated with a device / function or %-ENOENT,
 * if no GPIO has been assigned to the requested function.
 */
int acpi_gpio_count(struct device *dev, const char *con_id)
{
	struct acpi_device *adev = ACPI_COMPANION(dev);
	const union acpi_object *obj;
	const struct acpi_gpio_mapping *gm;
	int count = -ENOENT;
	int ret;
	char propname[32];
	unsigned int i;

	/* Try first from _DSD */
	for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
		if (con_id)
			snprintf(propname, sizeof(propname), "%s-%s",
				 con_id, gpio_suffixes[i]);
		else
			snprintf(propname, sizeof(propname), "%s",
				 gpio_suffixes[i]);

		ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY,
					    &obj);
		if (ret == 0) {
			if (obj->type == ACPI_TYPE_LOCAL_REFERENCE)
				count = 1;
			else if (obj->type == ACPI_TYPE_PACKAGE)
				count = acpi_gpio_package_count(obj);
		} else if (adev->driver_gpios) {
			for (gm = adev->driver_gpios; gm->name; gm++)
				if (strcmp(propname, gm->name) == 0) {
					count = gm->size;
					break;
				}
		}
		if (count > 0)
			break;
	}

	/* Then from plain _CRS GPIOs */
	if (count < 0) {
		struct list_head resource_list;
		unsigned int crs_count = 0;

		if (!acpi_can_fallback_to_crs(adev, con_id))
			return count;

		INIT_LIST_HEAD(&resource_list);
		acpi_dev_get_resources(adev, &resource_list,
				       acpi_find_gpio_count, &crs_count);
		acpi_dev_free_resource_list(&resource_list);
		if (crs_count > 0)
			count = crs_count;
	}
	return count ? count : -ENOENT;
}

bool acpi_can_fallback_to_crs(struct acpi_device *adev, const char *con_id)
{
	/* Never allow fallback if the device has properties */
	if (acpi_dev_has_props(adev) || adev->driver_gpios)
		return false;

	return con_id == NULL;
}

/* Run deferred acpi_gpiochip_request_irqs() */
static int acpi_gpio_handle_deferred_request_irqs(void)
{
	struct acpi_gpio_chip *acpi_gpio, *tmp;

	mutex_lock(&acpi_gpio_deferred_req_irqs_lock);
	list_for_each_entry_safe(acpi_gpio, tmp,
				 &acpi_gpio_deferred_req_irqs_list,
				 deferred_req_irqs_list_entry)
		acpi_gpiochip_request_irqs(acpi_gpio);

	acpi_gpio_deferred_req_irqs_done = true;
	mutex_unlock(&acpi_gpio_deferred_req_irqs_lock);

	return 0;
}
/* We must use _sync so that this runs after the first deferred_probe run */
late_initcall_sync(acpi_gpio_handle_deferred_request_irqs);

static const struct dmi_system_id run_edge_events_on_boot_blacklist[] = {
	{
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
			DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
		}
	},
	{} /* Terminating entry */
};

static int acpi_gpio_setup_params(void)
{
	if (run_edge_events_on_boot < 0) {
		if (dmi_check_system(run_edge_events_on_boot_blacklist))
			run_edge_events_on_boot = 0;
		else
			run_edge_events_on_boot = 1;
	}

	return 0;
}

/* Directly after dmi_setup() which runs as core_initcall() */
postcore_initcall(acpi_gpio_setup_params);