summaryrefslogtreecommitdiff
path: root/drivers/iio/accel/adxl372.c
blob: bc53af809d5de13c3b72b6c90b62c0b868e3b74f (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * ADXL372 3-Axis Digital Accelerometer core driver
 *
 * Copyright 2018 Analog Devices Inc.
 */

#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

#include "adxl372.h"

/* ADXL372 registers definition */
#define ADXL372_DEVID			0x00
#define ADXL372_DEVID_MST		0x01
#define ADXL372_PARTID			0x02
#define ADXL372_STATUS_1		0x04
#define ADXL372_STATUS_2		0x05
#define ADXL372_FIFO_ENTRIES_2		0x06
#define ADXL372_FIFO_ENTRIES_1		0x07
#define ADXL372_X_DATA_H		0x08
#define ADXL372_X_DATA_L		0x09
#define ADXL372_Y_DATA_H		0x0A
#define ADXL372_Y_DATA_L		0x0B
#define ADXL372_Z_DATA_H		0x0C
#define ADXL372_Z_DATA_L		0x0D
#define ADXL372_X_MAXPEAK_H		0x15
#define ADXL372_X_MAXPEAK_L		0x16
#define ADXL372_Y_MAXPEAK_H		0x17
#define ADXL372_Y_MAXPEAK_L		0x18
#define ADXL372_Z_MAXPEAK_H		0x19
#define ADXL372_Z_MAXPEAK_L		0x1A
#define ADXL372_OFFSET_X		0x20
#define ADXL372_OFFSET_Y		0x21
#define ADXL372_OFFSET_Z		0x22
#define ADXL372_X_THRESH_ACT_H		0x23
#define ADXL372_X_THRESH_ACT_L		0x24
#define ADXL372_Y_THRESH_ACT_H		0x25
#define ADXL372_Y_THRESH_ACT_L		0x26
#define ADXL372_Z_THRESH_ACT_H		0x27
#define ADXL372_Z_THRESH_ACT_L		0x28
#define ADXL372_TIME_ACT		0x29
#define ADXL372_X_THRESH_INACT_H	0x2A
#define ADXL372_X_THRESH_INACT_L	0x2B
#define ADXL372_Y_THRESH_INACT_H	0x2C
#define ADXL372_Y_THRESH_INACT_L	0x2D
#define ADXL372_Z_THRESH_INACT_H	0x2E
#define ADXL372_Z_THRESH_INACT_L	0x2F
#define ADXL372_TIME_INACT_H		0x30
#define ADXL372_TIME_INACT_L		0x31
#define ADXL372_X_THRESH_ACT2_H		0x32
#define ADXL372_X_THRESH_ACT2_L		0x33
#define ADXL372_Y_THRESH_ACT2_H		0x34
#define ADXL372_Y_THRESH_ACT2_L		0x35
#define ADXL372_Z_THRESH_ACT2_H		0x36
#define ADXL372_Z_THRESH_ACT2_L		0x37
#define ADXL372_HPF			0x38
#define ADXL372_FIFO_SAMPLES		0x39
#define ADXL372_FIFO_CTL		0x3A
#define ADXL372_INT1_MAP		0x3B
#define ADXL372_INT2_MAP		0x3C
#define ADXL372_TIMING			0x3D
#define ADXL372_MEASURE			0x3E
#define ADXL372_POWER_CTL		0x3F
#define ADXL372_SELF_TEST		0x40
#define ADXL372_RESET			0x41
#define ADXL372_FIFO_DATA		0x42

#define ADXL372_DEVID_VAL		0xAD
#define ADXL372_PARTID_VAL		0xFA
#define ADXL372_RESET_CODE		0x52

/* ADXL372_POWER_CTL */
#define ADXL372_POWER_CTL_MODE_MSK		GENMASK_ULL(1, 0)
#define ADXL372_POWER_CTL_MODE(x)		(((x) & 0x3) << 0)

/* ADXL372_MEASURE */
#define ADXL372_MEASURE_LINKLOOP_MSK		GENMASK_ULL(5, 4)
#define ADXL372_MEASURE_LINKLOOP_MODE(x)	(((x) & 0x3) << 4)
#define ADXL372_MEASURE_BANDWIDTH_MSK		GENMASK_ULL(2, 0)
#define ADXL372_MEASURE_BANDWIDTH_MODE(x)	(((x) & 0x7) << 0)

/* ADXL372_TIMING */
#define ADXL372_TIMING_ODR_MSK			GENMASK_ULL(7, 5)
#define ADXL372_TIMING_ODR_MODE(x)		(((x) & 0x7) << 5)

/* ADXL372_FIFO_CTL */
#define ADXL372_FIFO_CTL_FORMAT_MSK		GENMASK(5, 3)
#define ADXL372_FIFO_CTL_FORMAT_MODE(x)		(((x) & 0x7) << 3)
#define ADXL372_FIFO_CTL_MODE_MSK		GENMASK(2, 1)
#define ADXL372_FIFO_CTL_MODE_MODE(x)		(((x) & 0x3) << 1)
#define ADXL372_FIFO_CTL_SAMPLES_MSK		BIT(1)
#define ADXL372_FIFO_CTL_SAMPLES_MODE(x)	(((x) > 0xFF) ? 1 : 0)

/* ADXL372_STATUS_1 */
#define ADXL372_STATUS_1_DATA_RDY(x)		(((x) >> 0) & 0x1)
#define ADXL372_STATUS_1_FIFO_RDY(x)		(((x) >> 1) & 0x1)
#define ADXL372_STATUS_1_FIFO_FULL(x)		(((x) >> 2) & 0x1)
#define ADXL372_STATUS_1_FIFO_OVR(x)		(((x) >> 3) & 0x1)
#define ADXL372_STATUS_1_USR_NVM_BUSY(x)	(((x) >> 5) & 0x1)
#define ADXL372_STATUS_1_AWAKE(x)		(((x) >> 6) & 0x1)
#define ADXL372_STATUS_1_ERR_USR_REGS(x)	(((x) >> 7) & 0x1)

/* ADXL372_STATUS_2 */
#define ADXL372_STATUS_2_INACT(x)		(((x) >> 4) & 0x1)
#define ADXL372_STATUS_2_ACT(x)			(((x) >> 5) & 0x1)
#define ADXL372_STATUS_2_AC2(x)			(((x) >> 6) & 0x1)

/* ADXL372_INT1_MAP */
#define ADXL372_INT1_MAP_DATA_RDY_MSK		BIT(0)
#define ADXL372_INT1_MAP_DATA_RDY_MODE(x)	(((x) & 0x1) << 0)
#define ADXL372_INT1_MAP_FIFO_RDY_MSK		BIT(1)
#define ADXL372_INT1_MAP_FIFO_RDY_MODE(x)	(((x) & 0x1) << 1)
#define ADXL372_INT1_MAP_FIFO_FULL_MSK		BIT(2)
#define ADXL372_INT1_MAP_FIFO_FULL_MODE(x)	(((x) & 0x1) << 2)
#define ADXL372_INT1_MAP_FIFO_OVR_MSK		BIT(3)
#define ADXL372_INT1_MAP_FIFO_OVR_MODE(x)	(((x) & 0x1) << 3)
#define ADXL372_INT1_MAP_INACT_MSK		BIT(4)
#define ADXL372_INT1_MAP_INACT_MODE(x)		(((x) & 0x1) << 4)
#define ADXL372_INT1_MAP_ACT_MSK		BIT(5)
#define ADXL372_INT1_MAP_ACT_MODE(x)		(((x) & 0x1) << 5)
#define ADXL372_INT1_MAP_AWAKE_MSK		BIT(6)
#define ADXL372_INT1_MAP_AWAKE_MODE(x)		(((x) & 0x1) << 6)
#define ADXL372_INT1_MAP_LOW_MSK		BIT(7)
#define ADXL372_INT1_MAP_LOW_MODE(x)		(((x) & 0x1) << 7)

/* ADX372_THRESH */
#define ADXL372_THRESH_VAL_H_MSK	GENMASK(10, 3)
#define ADXL372_THRESH_VAL_H_SEL(x)	FIELD_GET(ADXL372_THRESH_VAL_H_MSK, x)
#define ADXL372_THRESH_VAL_L_MSK	GENMASK(2, 0)
#define ADXL372_THRESH_VAL_L_SEL(x)	FIELD_GET(ADXL372_THRESH_VAL_L_MSK, x)

/* The ADXL372 includes a deep, 512 sample FIFO buffer */
#define ADXL372_FIFO_SIZE			512
#define ADXL372_X_AXIS_EN(x)			((x) & BIT(0))
#define ADXL372_Y_AXIS_EN(x)			((x) & BIT(1))
#define ADXL372_Z_AXIS_EN(x)			((x) & BIT(2))

/*
 * At +/- 200g with 12-bit resolution, scale is computed as:
 * (200 + 200) * 9.81 / (2^12 - 1) = 0.958241
 */
#define ADXL372_USCALE	958241

enum adxl372_op_mode {
	ADXL372_STANDBY,
	ADXL372_WAKE_UP,
	ADXL372_INSTANT_ON,
	ADXL372_FULL_BW_MEASUREMENT,
};

enum adxl372_act_proc_mode {
	ADXL372_DEFAULT,
	ADXL372_LINKED,
	ADXL372_LOOPED,
};

enum adxl372_th_activity {
	ADXL372_ACTIVITY,
	ADXL372_ACTIVITY2,
	ADXL372_INACTIVITY,
};

enum adxl372_odr {
	ADXL372_ODR_400HZ,
	ADXL372_ODR_800HZ,
	ADXL372_ODR_1600HZ,
	ADXL372_ODR_3200HZ,
	ADXL372_ODR_6400HZ,
};

enum adxl372_bandwidth {
	ADXL372_BW_200HZ,
	ADXL372_BW_400HZ,
	ADXL372_BW_800HZ,
	ADXL372_BW_1600HZ,
	ADXL372_BW_3200HZ,
};

static const unsigned int adxl372_th_reg_high_addr[3] = {
	[ADXL372_ACTIVITY] = ADXL372_X_THRESH_ACT_H,
	[ADXL372_ACTIVITY2] = ADXL372_X_THRESH_ACT2_H,
	[ADXL372_INACTIVITY] = ADXL372_X_THRESH_INACT_H,
};

enum adxl372_fifo_format {
	ADXL372_XYZ_FIFO,
	ADXL372_X_FIFO,
	ADXL372_Y_FIFO,
	ADXL372_XY_FIFO,
	ADXL372_Z_FIFO,
	ADXL372_XZ_FIFO,
	ADXL372_YZ_FIFO,
	ADXL372_XYZ_PEAK_FIFO,
};

enum adxl372_fifo_mode {
	ADXL372_FIFO_BYPASSED,
	ADXL372_FIFO_STREAMED,
	ADXL372_FIFO_TRIGGERED,
	ADXL372_FIFO_OLD_SAVED
};

static const int adxl372_samp_freq_tbl[5] = {
	400, 800, 1600, 3200, 6400,
};

static const int adxl372_bw_freq_tbl[5] = {
	200, 400, 800, 1600, 3200,
};

struct adxl372_axis_lookup {
	unsigned int bits;
	enum adxl372_fifo_format fifo_format;
};

static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = {
	{ BIT(0), ADXL372_X_FIFO },
	{ BIT(1), ADXL372_Y_FIFO },
	{ BIT(2), ADXL372_Z_FIFO },
	{ BIT(0) | BIT(1), ADXL372_XY_FIFO },
	{ BIT(0) | BIT(2), ADXL372_XZ_FIFO },
	{ BIT(1) | BIT(2), ADXL372_YZ_FIFO },
	{ BIT(0) | BIT(1) | BIT(2), ADXL372_XYZ_FIFO },
};

static const struct iio_event_spec adxl372_events[] = {
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE),
		.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_ENABLE),
	}, {
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_FALLING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE),
		.mask_shared_by_all = BIT(IIO_EV_INFO_PERIOD) | BIT(IIO_EV_INFO_ENABLE),
	},
};

#define ADXL372_ACCEL_CHANNEL(index, reg, axis) {			\
	.type = IIO_ACCEL,						\
	.address = reg,							\
	.modified = 1,							\
	.channel2 = IIO_MOD_##axis,					\
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |		\
				    BIT(IIO_CHAN_INFO_SAMP_FREQ) |	\
		BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),	\
	.scan_index = index,						\
	.scan_type = {							\
		.sign = 's',						\
		.realbits = 12,						\
		.storagebits = 16,					\
		.shift = 4,						\
		.endianness = IIO_BE,					\
	},								\
	.event_spec = adxl372_events,					\
	.num_event_specs = ARRAY_SIZE(adxl372_events)			\
}

static const struct iio_chan_spec adxl372_channels[] = {
	ADXL372_ACCEL_CHANNEL(0, ADXL372_X_DATA_H, X),
	ADXL372_ACCEL_CHANNEL(1, ADXL372_Y_DATA_H, Y),
	ADXL372_ACCEL_CHANNEL(2, ADXL372_Z_DATA_H, Z),
};

struct adxl372_state {
	int				irq;
	struct device			*dev;
	struct regmap			*regmap;
	struct iio_trigger		*dready_trig;
	struct iio_trigger		*peak_datardy_trig;
	enum adxl372_fifo_mode		fifo_mode;
	enum adxl372_fifo_format	fifo_format;
	unsigned int			fifo_axis_mask;
	enum adxl372_op_mode		op_mode;
	enum adxl372_act_proc_mode	act_proc_mode;
	enum adxl372_odr		odr;
	enum adxl372_bandwidth		bw;
	u32				act_time_ms;
	u32				inact_time_ms;
	u8				fifo_set_size;
	unsigned long			int1_bitmask;
	unsigned long			int2_bitmask;
	u16				watermark;
	__be16				fifo_buf[ADXL372_FIFO_SIZE];
	bool				peak_fifo_mode_en;
	struct mutex			threshold_m; /* lock for threshold */
};

static const unsigned long adxl372_channel_masks[] = {
	BIT(0), BIT(1), BIT(2),
	BIT(0) | BIT(1),
	BIT(0) | BIT(2),
	BIT(1) | BIT(2),
	BIT(0) | BIT(1) | BIT(2),
	0
};

static ssize_t adxl372_read_threshold_value(struct iio_dev *indio_dev, unsigned int addr,
					    u16 *threshold)
{
	struct adxl372_state *st = iio_priv(indio_dev);
	__be16 raw_regval;
	u16 regval;
	int ret;

	ret = regmap_bulk_read(st->regmap, addr, &raw_regval, sizeof(raw_regval));
	if (ret < 0)
		return ret;

	regval = be16_to_cpu(raw_regval);
	regval >>= 5;

	*threshold = regval;

	return 0;
}

static ssize_t adxl372_write_threshold_value(struct iio_dev *indio_dev, unsigned int addr,
					     u16 threshold)
{
	struct adxl372_state *st = iio_priv(indio_dev);
	int ret;

	mutex_lock(&st->threshold_m);
	ret = regmap_write(st->regmap, addr, ADXL372_THRESH_VAL_H_SEL(threshold));
	if (ret < 0)
		goto unlock;

	ret = regmap_update_bits(st->regmap, addr + 1, GENMASK(7, 5),
				 ADXL372_THRESH_VAL_L_SEL(threshold) << 5);

unlock:
	mutex_unlock(&st->threshold_m);

	return ret;
}

static int adxl372_read_axis(struct adxl372_state *st, u8 addr)
{
	__be16 regval;
	int ret;

	ret = regmap_bulk_read(st->regmap, addr, &regval, sizeof(regval));
	if (ret < 0)
		return ret;

	return be16_to_cpu(regval);
}

static int adxl372_set_op_mode(struct adxl372_state *st,
			       enum adxl372_op_mode op_mode)
{
	int ret;

	ret = regmap_update_bits(st->regmap, ADXL372_POWER_CTL,
				 ADXL372_POWER_CTL_MODE_MSK,
				 ADXL372_POWER_CTL_MODE(op_mode));
	if (ret < 0)
		return ret;

	st->op_mode = op_mode;

	return ret;
}

static int adxl372_set_odr(struct adxl372_state *st,
			   enum adxl372_odr odr)
{
	int ret;

	ret = regmap_update_bits(st->regmap, ADXL372_TIMING,
				 ADXL372_TIMING_ODR_MSK,
				 ADXL372_TIMING_ODR_MODE(odr));
	if (ret < 0)
		return ret;

	st->odr = odr;

	return ret;
}

static int adxl372_find_closest_match(const int *array,
				      unsigned int size, int val)
{
	int i;

	for (i = 0; i < size; i++) {
		if (val <= array[i])
			return i;
	}

	return size - 1;
}

static int adxl372_set_bandwidth(struct adxl372_state *st,
				 enum adxl372_bandwidth bw)
{
	int ret;

	ret = regmap_update_bits(st->regmap, ADXL372_MEASURE,
				 ADXL372_MEASURE_BANDWIDTH_MSK,
				 ADXL372_MEASURE_BANDWIDTH_MODE(bw));
	if (ret < 0)
		return ret;

	st->bw = bw;

	return ret;
}

static int adxl372_set_act_proc_mode(struct adxl372_state *st,
				     enum adxl372_act_proc_mode mode)
{
	int ret;

	ret = regmap_update_bits(st->regmap,
				 ADXL372_MEASURE,
				 ADXL372_MEASURE_LINKLOOP_MSK,
				 ADXL372_MEASURE_LINKLOOP_MODE(mode));
	if (ret < 0)
		return ret;

	st->act_proc_mode = mode;

	return ret;
}

static int adxl372_set_activity_threshold(struct adxl372_state *st,
					  enum adxl372_th_activity act,
					  bool ref_en, bool enable,
					  unsigned int threshold)
{
	unsigned char buf[6];
	unsigned char th_reg_high_val, th_reg_low_val, th_reg_high_addr;

	/* scale factor is 100 mg/code */
	th_reg_high_val = (threshold / 100) >> 3;
	th_reg_low_val = ((threshold / 100) << 5) | (ref_en << 1) | enable;
	th_reg_high_addr = adxl372_th_reg_high_addr[act];

	buf[0] = th_reg_high_val;
	buf[1] = th_reg_low_val;
	buf[2] = th_reg_high_val;
	buf[3] = th_reg_low_val;
	buf[4] = th_reg_high_val;
	buf[5] = th_reg_low_val;

	return regmap_bulk_write(st->regmap, th_reg_high_addr,
				 buf, ARRAY_SIZE(buf));
}

static int adxl372_set_activity_time_ms(struct adxl372_state *st,
					unsigned int act_time_ms)
{
	unsigned int reg_val, scale_factor;
	int ret;

	/*
	 * 3.3 ms per code is the scale factor of the TIME_ACT register for
	 * ODR = 6400 Hz. It is 6.6 ms per code for ODR = 3200 Hz and below.
	 */
	if (st->odr == ADXL372_ODR_6400HZ)
		scale_factor = 3300;
	else
		scale_factor = 6600;

	reg_val = DIV_ROUND_CLOSEST(act_time_ms * 1000, scale_factor);

	/* TIME_ACT register is 8 bits wide */
	if (reg_val > 0xFF)
		reg_val = 0xFF;

	ret = regmap_write(st->regmap, ADXL372_TIME_ACT, reg_val);
	if (ret < 0)
		return ret;

	st->act_time_ms = act_time_ms;

	return ret;
}

static int adxl372_set_inactivity_time_ms(struct adxl372_state *st,
					  unsigned int inact_time_ms)
{
	unsigned int reg_val_h, reg_val_l, res, scale_factor;
	int ret;

	/*
	 * 13 ms per code is the scale factor of the TIME_INACT register for
	 * ODR = 6400 Hz. It is 26 ms per code for ODR = 3200 Hz and below.
	 */
	if (st->odr == ADXL372_ODR_6400HZ)
		scale_factor = 13;
	else
		scale_factor = 26;

	res = DIV_ROUND_CLOSEST(inact_time_ms, scale_factor);
	reg_val_h = (res >> 8) & 0xFF;
	reg_val_l = res & 0xFF;

	ret = regmap_write(st->regmap, ADXL372_TIME_INACT_H, reg_val_h);
	if (ret < 0)
		return ret;

	ret = regmap_write(st->regmap, ADXL372_TIME_INACT_L, reg_val_l);
	if (ret < 0)
		return ret;

	st->inact_time_ms = inact_time_ms;

	return ret;
}

static int adxl372_set_interrupts(struct adxl372_state *st,
				  unsigned long int1_bitmask,
				  unsigned long int2_bitmask)
{
	int ret;

	ret = regmap_write(st->regmap, ADXL372_INT1_MAP, int1_bitmask);
	if (ret < 0)
		return ret;

	return regmap_write(st->regmap, ADXL372_INT2_MAP, int2_bitmask);
}

static int adxl372_configure_fifo(struct adxl372_state *st)
{
	unsigned int fifo_samples, fifo_ctl;
	int ret;

	/* FIFO must be configured while in standby mode */
	ret = adxl372_set_op_mode(st, ADXL372_STANDBY);
	if (ret < 0)
		return ret;

	/*
	 * watermark stores the number of sets; we need to write the FIFO
	 * registers with the number of samples
	 */
	fifo_samples = (st->watermark * st->fifo_set_size);
	fifo_ctl = ADXL372_FIFO_CTL_FORMAT_MODE(st->fifo_format) |
		   ADXL372_FIFO_CTL_MODE_MODE(st->fifo_mode) |
		   ADXL372_FIFO_CTL_SAMPLES_MODE(fifo_samples);

	ret = regmap_write(st->regmap,
			   ADXL372_FIFO_SAMPLES, fifo_samples & 0xFF);
	if (ret < 0)
		return ret;

	ret = regmap_write(st->regmap, ADXL372_FIFO_CTL, fifo_ctl);
	if (ret < 0)
		return ret;

	return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT);
}

static int adxl372_get_status(struct adxl372_state *st,
			      u8 *status1, u8 *status2,
			      u16 *fifo_entries)
{
	__be32 buf;
	u32 val;
	int ret;

	/* STATUS1, STATUS2, FIFO_ENTRIES2 and FIFO_ENTRIES are adjacent regs */
	ret = regmap_bulk_read(st->regmap, ADXL372_STATUS_1,
			       &buf, sizeof(buf));
	if (ret < 0)
		return ret;

	val = be32_to_cpu(buf);

	*status1 = (val >> 24) & 0x0F;
	*status2 = (val >> 16) & 0x0F;
	/*
	 * FIFO_ENTRIES contains the least significant byte, and FIFO_ENTRIES2
	 * contains the two most significant bits
	 */
	*fifo_entries = val & 0x3FF;

	return ret;
}

static void adxl372_arrange_axis_data(struct adxl372_state *st, __be16 *sample)
{
	__be16	axis_sample[3];
	int i = 0;

	memset(axis_sample, 0, 3 * sizeof(__be16));
	if (ADXL372_X_AXIS_EN(st->fifo_axis_mask))
		axis_sample[i++] = sample[0];
	if (ADXL372_Y_AXIS_EN(st->fifo_axis_mask))
		axis_sample[i++] = sample[1];
	if (ADXL372_Z_AXIS_EN(st->fifo_axis_mask))
		axis_sample[i++] = sample[2];

	memcpy(sample, axis_sample, 3 * sizeof(__be16));
}

static void adxl372_push_event(struct iio_dev *indio_dev, s64 timestamp, u8 status2)
{
	unsigned int ev_dir = IIO_EV_DIR_NONE;

	if (ADXL372_STATUS_2_ACT(status2))
		ev_dir = IIO_EV_DIR_RISING;

	if (ADXL372_STATUS_2_INACT(status2))
		ev_dir = IIO_EV_DIR_FALLING;

	if (ev_dir != IIO_EV_DIR_NONE)
		iio_push_event(indio_dev,
			       IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X_OR_Y_OR_Z,
						  IIO_EV_TYPE_THRESH, ev_dir),
			       timestamp);
}

static irqreturn_t adxl372_trigger_handler(int irq, void  *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct adxl372_state *st = iio_priv(indio_dev);
	u8 status1, status2;
	u16 fifo_entries;
	int i, ret;

	ret = adxl372_get_status(st, &status1, &status2, &fifo_entries);
	if (ret < 0)
		goto err;

	adxl372_push_event(indio_dev, iio_get_time_ns(indio_dev), status2);

	if (st->fifo_mode != ADXL372_FIFO_BYPASSED &&
	    ADXL372_STATUS_1_FIFO_FULL(status1)) {
		/*
		 * When reading data from multiple axes from the FIFO,
		 * to ensure that data is not overwritten and stored out
		 * of order at least one sample set must be left in the
		 * FIFO after every read.
		 */
		fifo_entries -= st->fifo_set_size;

		/* Read data from the FIFO */
		ret = regmap_noinc_read(st->regmap, ADXL372_FIFO_DATA,
					st->fifo_buf,
					fifo_entries * sizeof(u16));
		if (ret < 0)
			goto err;

		/* Each sample is 2 bytes */
		for (i = 0; i < fifo_entries; i += st->fifo_set_size) {
			/* filter peak detection data */
			if (st->peak_fifo_mode_en)
				adxl372_arrange_axis_data(st, &st->fifo_buf[i]);
			iio_push_to_buffers(indio_dev, &st->fifo_buf[i]);
		}
	}
err:
	iio_trigger_notify_done(indio_dev->trig);
	return IRQ_HANDLED;
}

static int adxl372_setup(struct adxl372_state *st)
{
	unsigned int regval;
	int ret;

	ret = regmap_read(st->regmap, ADXL372_DEVID, &regval);
	if (ret < 0)
		return ret;

	if (regval != ADXL372_DEVID_VAL) {
		dev_err(st->dev, "Invalid chip id %x\n", regval);
		return -ENODEV;
	}

	/*
	 * Perform a software reset to make sure the device is in a consistent
	 * state after start up.
	 */
	ret = regmap_write(st->regmap, ADXL372_RESET, ADXL372_RESET_CODE);
	if (ret < 0)
		return ret;

	ret = adxl372_set_op_mode(st, ADXL372_STANDBY);
	if (ret < 0)
		return ret;

	/* Set threshold for activity detection to 1g */
	ret = adxl372_set_activity_threshold(st, ADXL372_ACTIVITY,
					     true, true, 1000);
	if (ret < 0)
		return ret;

	/* Set threshold for inactivity detection to 100mg */
	ret = adxl372_set_activity_threshold(st, ADXL372_INACTIVITY,
					     true, true, 100);
	if (ret < 0)
		return ret;

	/* Set activity processing in Looped mode */
	ret = adxl372_set_act_proc_mode(st, ADXL372_LOOPED);
	if (ret < 0)
		return ret;

	ret = adxl372_set_odr(st, ADXL372_ODR_6400HZ);
	if (ret < 0)
		return ret;

	ret = adxl372_set_bandwidth(st, ADXL372_BW_3200HZ);
	if (ret < 0)
		return ret;

	/* Set activity timer to 1ms */
	ret = adxl372_set_activity_time_ms(st, 1);
	if (ret < 0)
		return ret;

	/* Set inactivity timer to 10s */
	ret = adxl372_set_inactivity_time_ms(st, 10000);
	if (ret < 0)
		return ret;

	/* Set the mode of operation to full bandwidth measurement mode */
	return adxl372_set_op_mode(st, ADXL372_FULL_BW_MEASUREMENT);
}

static int adxl372_reg_access(struct iio_dev *indio_dev,
			      unsigned int reg,
			      unsigned int writeval,
			      unsigned int *readval)
{
	struct adxl372_state *st = iio_priv(indio_dev);

	if (readval)
		return regmap_read(st->regmap, reg, readval);
	else
		return regmap_write(st->regmap, reg, writeval);
}

static int adxl372_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long info)
{
	struct adxl372_state *st = iio_priv(indio_dev);
	int ret;

	switch (info) {
	case IIO_CHAN_INFO_RAW:
		ret = iio_device_claim_direct_mode(indio_dev);
		if (ret)
			return ret;

		ret = adxl372_read_axis(st, chan->address);
		iio_device_release_direct_mode(indio_dev);
		if (ret < 0)
			return ret;

		*val = sign_extend32(ret >> chan->scan_type.shift,
				     chan->scan_type.realbits - 1);
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = ADXL372_USCALE;
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SAMP_FREQ:
		*val = adxl372_samp_freq_tbl[st->odr];
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
		*val = adxl372_bw_freq_tbl[st->bw];
		return IIO_VAL_INT;
	}

	return -EINVAL;
}

static int adxl372_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long info)
{
	struct adxl372_state *st = iio_priv(indio_dev);
	int odr_index, bw_index, ret;

	switch (info) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		odr_index = adxl372_find_closest_match(adxl372_samp_freq_tbl,
					ARRAY_SIZE(adxl372_samp_freq_tbl),
					val);
		ret = adxl372_set_odr(st, odr_index);
		if (ret < 0)
			return ret;
		/*
		 * The timer period depends on the ODR selected.
		 * At 3200 Hz and below, it is 6.6 ms; at 6400 Hz, it is 3.3 ms
		 */
		ret = adxl372_set_activity_time_ms(st, st->act_time_ms);
		if (ret < 0)
			return ret;
		/*
		 * The timer period depends on the ODR selected.
		 * At 3200 Hz and below, it is 26 ms; at 6400 Hz, it is 13 ms
		 */
		ret = adxl372_set_inactivity_time_ms(st, st->inact_time_ms);
		if (ret < 0)
			return ret;
		/*
		 * The maximum bandwidth is constrained to at most half of
		 * the ODR to ensure that the Nyquist criteria is not violated
		 */
		if (st->bw > odr_index)
			ret = adxl372_set_bandwidth(st, odr_index);

		return ret;
	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
		bw_index = adxl372_find_closest_match(adxl372_bw_freq_tbl,
					ARRAY_SIZE(adxl372_bw_freq_tbl),
					val);
		return adxl372_set_bandwidth(st, bw_index);
	default:
		return -EINVAL;
	}
}

static int adxl372_read_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan,
				    enum iio_event_type type, enum iio_event_direction dir,
				    enum iio_event_info info, int *val, int *val2)
{
	struct adxl372_state *st = iio_priv(indio_dev);
	unsigned int addr;
	u16 raw_value;
	int ret;

	switch (info) {
	case IIO_EV_INFO_VALUE:
		switch (dir) {
		case IIO_EV_DIR_RISING:
			addr = ADXL372_X_THRESH_ACT_H + 2 * chan->scan_index;
			ret = adxl372_read_threshold_value(indio_dev, addr, &raw_value);
			if (ret < 0)
				return ret;
			*val = raw_value * ADXL372_USCALE;
			*val2 = 1000000;
			return IIO_VAL_FRACTIONAL;
		case IIO_EV_DIR_FALLING:
			addr = ADXL372_X_THRESH_INACT_H + 2 * chan->scan_index;
			ret =  adxl372_read_threshold_value(indio_dev, addr, &raw_value);
			if (ret < 0)
				return ret;
			*val = raw_value * ADXL372_USCALE;
			*val2 = 1000000;
			return IIO_VAL_FRACTIONAL;
		default:
			return -EINVAL;
		}
	case IIO_EV_INFO_PERIOD:
		switch (dir) {
		case IIO_EV_DIR_RISING:
			*val = st->act_time_ms;
			*val2 = 1000;
			return IIO_VAL_FRACTIONAL;
		case IIO_EV_DIR_FALLING:
			*val = st->inact_time_ms;
			*val2 = 1000;
			return IIO_VAL_FRACTIONAL;
		default:
			return -EINVAL;
		}
	default:
		return -EINVAL;
	}
}

static int adxl372_write_event_value(struct iio_dev *indio_dev, const struct iio_chan_spec *chan,
				     enum iio_event_type type, enum iio_event_direction dir,
				     enum iio_event_info info, int val, int val2)
{
	struct adxl372_state *st = iio_priv(indio_dev);
	unsigned int val_ms;
	unsigned int addr;
	u16 raw_val;

	switch (info) {
	case IIO_EV_INFO_VALUE:
		raw_val = DIV_ROUND_UP(val * 1000000, ADXL372_USCALE);
		switch (dir) {
		case IIO_EV_DIR_RISING:
			addr = ADXL372_X_THRESH_ACT_H + 2 * chan->scan_index;
			return adxl372_write_threshold_value(indio_dev, addr, raw_val);
		case IIO_EV_DIR_FALLING:
			addr = ADXL372_X_THRESH_INACT_H + 2 * chan->scan_index;
			return adxl372_write_threshold_value(indio_dev, addr, raw_val);
		default:
			return -EINVAL;
		}
	case IIO_EV_INFO_PERIOD:
		val_ms = val * 1000 + DIV_ROUND_UP(val2, 1000);
		switch (dir) {
		case IIO_EV_DIR_RISING:
			return adxl372_set_activity_time_ms(st, val_ms);
		case IIO_EV_DIR_FALLING:
			return adxl372_set_inactivity_time_ms(st, val_ms);
		default:
			return -EINVAL;
		}
	default:
		return -EINVAL;
	}
}

static int adxl372_read_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan,
				     enum iio_event_type type, enum iio_event_direction dir)
{
	struct adxl372_state *st = iio_priv(indio_dev);

	switch (dir) {
	case IIO_EV_DIR_RISING:
		return FIELD_GET(ADXL372_INT1_MAP_ACT_MSK, st->int1_bitmask);
	case IIO_EV_DIR_FALLING:
		return FIELD_GET(ADXL372_INT1_MAP_INACT_MSK, st->int1_bitmask);
	default:
		return -EINVAL;
	}
}

static int adxl372_write_event_config(struct iio_dev *indio_dev, const struct iio_chan_spec *chan,
				      enum iio_event_type type, enum iio_event_direction dir,
				      int state)
{
	struct adxl372_state *st = iio_priv(indio_dev);

	switch (dir) {
	case IIO_EV_DIR_RISING:
		set_mask_bits(&st->int1_bitmask, ADXL372_INT1_MAP_ACT_MSK,
			      ADXL372_INT1_MAP_ACT_MODE(state));
		break;
	case IIO_EV_DIR_FALLING:
		set_mask_bits(&st->int1_bitmask, ADXL372_INT1_MAP_INACT_MSK,
			      ADXL372_INT1_MAP_INACT_MODE(state));
		break;
	default:
		return -EINVAL;
	}

	return adxl372_set_interrupts(st, st->int1_bitmask, 0);
}

static ssize_t adxl372_show_filter_freq_avail(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct adxl372_state *st = iio_priv(indio_dev);
	int i;
	size_t len = 0;

	for (i = 0; i <= st->odr; i++)
		len += scnprintf(buf + len, PAGE_SIZE - len,
				 "%d ", adxl372_bw_freq_tbl[i]);

	buf[len - 1] = '\n';

	return len;
}

static ssize_t adxl372_get_fifo_enabled(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct adxl372_state *st = iio_priv(indio_dev);

	return sprintf(buf, "%d\n", st->fifo_mode);
}

static ssize_t adxl372_get_fifo_watermark(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
	struct adxl372_state *st = iio_priv(indio_dev);

	return sprintf(buf, "%d\n", st->watermark);
}

static ssize_t hwfifo_watermark_min_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	return sysfs_emit(buf, "%s\n", "1");
}

static ssize_t hwfifo_watermark_max_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	return sysfs_emit(buf, "%s\n", __stringify(ADXL372_FIFO_SIZE));
}

static IIO_DEVICE_ATTR_RO(hwfifo_watermark_min, 0);
static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0);
static IIO_DEVICE_ATTR(hwfifo_watermark, 0444,
		       adxl372_get_fifo_watermark, NULL, 0);
static IIO_DEVICE_ATTR(hwfifo_enabled, 0444,
		       adxl372_get_fifo_enabled, NULL, 0);

static const struct attribute *adxl372_fifo_attributes[] = {
	&iio_dev_attr_hwfifo_watermark_min.dev_attr.attr,
	&iio_dev_attr_hwfifo_watermark_max.dev_attr.attr,
	&iio_dev_attr_hwfifo_watermark.dev_attr.attr,
	&iio_dev_attr_hwfifo_enabled.dev_attr.attr,
	NULL,
};

static int adxl372_set_watermark(struct iio_dev *indio_dev, unsigned int val)
{
	struct adxl372_state *st  = iio_priv(indio_dev);

	if (val > ADXL372_FIFO_SIZE)
		val = ADXL372_FIFO_SIZE;

	st->watermark = val;

	return 0;
}

static int adxl372_buffer_postenable(struct iio_dev *indio_dev)
{
	struct adxl372_state *st = iio_priv(indio_dev);
	unsigned int mask;
	int i, ret;

	st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK;
	ret = adxl372_set_interrupts(st, st->int1_bitmask, 0);
	if (ret < 0)
		return ret;

	mask = *indio_dev->active_scan_mask;

	for (i = 0; i < ARRAY_SIZE(adxl372_axis_lookup_table); i++) {
		if (mask == adxl372_axis_lookup_table[i].bits)
			break;
	}

	if (i == ARRAY_SIZE(adxl372_axis_lookup_table))
		return -EINVAL;

	st->fifo_format = adxl372_axis_lookup_table[i].fifo_format;
	st->fifo_axis_mask = adxl372_axis_lookup_table[i].bits;
	st->fifo_set_size = bitmap_weight(indio_dev->active_scan_mask,
					  indio_dev->masklength);

	/* Configure the FIFO to store sets of impact event peak. */
	if (st->peak_fifo_mode_en) {
		st->fifo_set_size = 3;
		st->fifo_format = ADXL372_XYZ_PEAK_FIFO;
	}

	/*
	 * The 512 FIFO samples can be allotted in several ways, such as:
	 * 170 sample sets of concurrent 3-axis data
	 * 256 sample sets of concurrent 2-axis data (user selectable)
	 * 512 sample sets of single-axis data
	 * 170 sets of impact event peak (x, y, z)
	 */
	if ((st->watermark * st->fifo_set_size) > ADXL372_FIFO_SIZE)
		st->watermark = (ADXL372_FIFO_SIZE  / st->fifo_set_size);

	st->fifo_mode = ADXL372_FIFO_STREAMED;

	ret = adxl372_configure_fifo(st);
	if (ret < 0) {
		st->fifo_mode = ADXL372_FIFO_BYPASSED;
		st->int1_bitmask &= ~ADXL372_INT1_MAP_FIFO_FULL_MSK;
		adxl372_set_interrupts(st, st->int1_bitmask, 0);
		return ret;
	}

	return 0;
}

static int adxl372_buffer_predisable(struct iio_dev *indio_dev)
{
	struct adxl372_state *st = iio_priv(indio_dev);

	st->int1_bitmask &= ~ADXL372_INT1_MAP_FIFO_FULL_MSK;
	adxl372_set_interrupts(st, st->int1_bitmask, 0);
	st->fifo_mode = ADXL372_FIFO_BYPASSED;
	adxl372_configure_fifo(st);

	return 0;
}

static const struct iio_buffer_setup_ops adxl372_buffer_ops = {
	.postenable = adxl372_buffer_postenable,
	.predisable = adxl372_buffer_predisable,
};

static int adxl372_dready_trig_set_state(struct iio_trigger *trig,
					 bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct adxl372_state *st = iio_priv(indio_dev);

	if (state)
		st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK;

	return adxl372_set_interrupts(st, st->int1_bitmask, 0);
}

static int adxl372_validate_trigger(struct iio_dev *indio_dev,
				    struct iio_trigger *trig)
{
	struct adxl372_state *st = iio_priv(indio_dev);

	if (st->dready_trig != trig && st->peak_datardy_trig != trig)
		return -EINVAL;

	return 0;
}

static const struct iio_trigger_ops adxl372_trigger_ops = {
	.validate_device = &iio_trigger_validate_own_device,
	.set_trigger_state = adxl372_dready_trig_set_state,
};

static int adxl372_peak_dready_trig_set_state(struct iio_trigger *trig,
					      bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct adxl372_state *st = iio_priv(indio_dev);

	if (state)
		st->int1_bitmask |= ADXL372_INT1_MAP_FIFO_FULL_MSK;

	st->peak_fifo_mode_en = state;

	return adxl372_set_interrupts(st, st->int1_bitmask, 0);
}

static const struct iio_trigger_ops adxl372_peak_data_trigger_ops = {
	.validate_device = &iio_trigger_validate_own_device,
	.set_trigger_state = adxl372_peak_dready_trig_set_state,
};

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("400 800 1600 3200 6400");
static IIO_DEVICE_ATTR(in_accel_filter_low_pass_3db_frequency_available,
		       0444, adxl372_show_filter_freq_avail, NULL, 0);

static struct attribute *adxl372_attributes[] = {
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	&iio_dev_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group adxl372_attrs_group = {
	.attrs = adxl372_attributes,
};

static const struct iio_info adxl372_info = {
	.validate_trigger = &adxl372_validate_trigger,
	.attrs = &adxl372_attrs_group,
	.read_raw = adxl372_read_raw,
	.write_raw = adxl372_write_raw,
	.read_event_config = adxl372_read_event_config,
	.write_event_config = adxl372_write_event_config,
	.read_event_value = adxl372_read_event_value,
	.write_event_value = adxl372_write_event_value,
	.debugfs_reg_access = &adxl372_reg_access,
	.hwfifo_set_watermark = adxl372_set_watermark,
};

bool adxl372_readable_noinc_reg(struct device *dev, unsigned int reg)
{
	return (reg == ADXL372_FIFO_DATA);
}
EXPORT_SYMBOL_NS_GPL(adxl372_readable_noinc_reg, IIO_ADXL372);

int adxl372_probe(struct device *dev, struct regmap *regmap,
		  int irq, const char *name)
{
	struct iio_dev *indio_dev;
	struct adxl372_state *st;
	int ret;

	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
	if (!indio_dev)
		return -ENOMEM;

	st = iio_priv(indio_dev);
	dev_set_drvdata(dev, indio_dev);

	st->dev = dev;
	st->regmap = regmap;
	st->irq = irq;

	mutex_init(&st->threshold_m);

	indio_dev->channels = adxl372_channels;
	indio_dev->num_channels = ARRAY_SIZE(adxl372_channels);
	indio_dev->available_scan_masks = adxl372_channel_masks;
	indio_dev->name = name;
	indio_dev->info = &adxl372_info;
	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;

	ret = adxl372_setup(st);
	if (ret < 0) {
		dev_err(dev, "ADXL372 setup failed\n");
		return ret;
	}

	ret = devm_iio_triggered_buffer_setup_ext(dev,
						  indio_dev, NULL,
						  adxl372_trigger_handler,
						  IIO_BUFFER_DIRECTION_IN,
						  &adxl372_buffer_ops,
						  adxl372_fifo_attributes);
	if (ret < 0)
		return ret;

	if (st->irq) {
		st->dready_trig = devm_iio_trigger_alloc(dev,
							 "%s-dev%d",
							 indio_dev->name,
							 iio_device_id(indio_dev));
		if (st->dready_trig == NULL)
			return -ENOMEM;

		st->peak_datardy_trig = devm_iio_trigger_alloc(dev,
							       "%s-dev%d-peak",
							       indio_dev->name,
							       iio_device_id(indio_dev));
		if (!st->peak_datardy_trig)
			return -ENOMEM;

		st->dready_trig->ops = &adxl372_trigger_ops;
		st->peak_datardy_trig->ops = &adxl372_peak_data_trigger_ops;
		iio_trigger_set_drvdata(st->dready_trig, indio_dev);
		iio_trigger_set_drvdata(st->peak_datardy_trig, indio_dev);
		ret = devm_iio_trigger_register(dev, st->dready_trig);
		if (ret < 0)
			return ret;

		ret = devm_iio_trigger_register(dev, st->peak_datardy_trig);
		if (ret < 0)
			return ret;

		indio_dev->trig = iio_trigger_get(st->dready_trig);

		ret = devm_request_threaded_irq(dev, st->irq,
					iio_trigger_generic_data_rdy_poll,
					NULL,
					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					indio_dev->name, st->dready_trig);
		if (ret < 0)
			return ret;
	}

	return devm_iio_device_register(dev, indio_dev);
}
EXPORT_SYMBOL_NS_GPL(adxl372_probe, IIO_ADXL372);

MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
MODULE_DESCRIPTION("Analog Devices ADXL372 3-axis accelerometer driver");
MODULE_LICENSE("GPL");