aboutsummaryrefslogtreecommitdiff
path: root/drivers/iio/imu/adis16475.c
blob: aec55f7e1f26023f210b2b8fe4fa7fbb33b1abc7 (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
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
// SPDX-License-Identifier: GPL-2.0
/*
 * ADIS16475 IMU driver
 *
 * Copyright 2019 Analog Devices Inc.
 */
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/imu/adis.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/irq.h>
#include <linux/lcm.h>
#include <linux/math.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/spi/spi.h>

#define ADIS16475_REG_DIAG_STAT		0x02
#define ADIS16475_REG_X_GYRO_L		0x04
#define ADIS16475_REG_Y_GYRO_L		0x08
#define ADIS16475_REG_Z_GYRO_L		0x0C
#define ADIS16475_REG_X_ACCEL_L		0x10
#define ADIS16475_REG_Y_ACCEL_L		0x14
#define ADIS16475_REG_Z_ACCEL_L		0x18
#define ADIS16475_REG_TEMP_OUT		0x1c
#define ADIS16475_REG_X_GYRO_BIAS_L	0x40
#define ADIS16475_REG_Y_GYRO_BIAS_L	0x44
#define ADIS16475_REG_Z_GYRO_BIAS_L	0x48
#define ADIS16475_REG_X_ACCEL_BIAS_L	0x4c
#define ADIS16475_REG_Y_ACCEL_BIAS_L	0x50
#define ADIS16475_REG_Z_ACCEL_BIAS_L	0x54
#define ADIS16475_REG_FILT_CTRL		0x5c
#define ADIS16475_FILT_CTRL_MASK	GENMASK(2, 0)
#define ADIS16475_FILT_CTRL(x)		FIELD_PREP(ADIS16475_FILT_CTRL_MASK, x)
#define ADIS16475_REG_MSG_CTRL		0x60
#define ADIS16475_MSG_CTRL_DR_POL_MASK	BIT(0)
#define ADIS16475_MSG_CTRL_DR_POL(x) \
				FIELD_PREP(ADIS16475_MSG_CTRL_DR_POL_MASK, x)
#define ADIS16475_SYNC_MODE_MASK	GENMASK(4, 2)
#define ADIS16475_SYNC_MODE(x)		FIELD_PREP(ADIS16475_SYNC_MODE_MASK, x)
#define ADIS16475_REG_UP_SCALE		0x62
#define ADIS16475_REG_DEC_RATE		0x64
#define ADIS16475_REG_GLOB_CMD		0x68
#define ADIS16475_REG_FIRM_REV		0x6c
#define ADIS16475_REG_FIRM_DM		0x6e
#define ADIS16475_REG_FIRM_Y		0x70
#define ADIS16475_REG_PROD_ID		0x72
#define ADIS16475_REG_SERIAL_NUM	0x74
#define ADIS16475_REG_FLASH_CNT		0x7c
#define ADIS16500_BURST32_MASK		BIT(9)
#define ADIS16500_BURST32(x)		FIELD_PREP(ADIS16500_BURST32_MASK, x)
/* number of data elements in burst mode */
#define ADIS16475_BURST32_MAX_DATA	32
#define ADIS16475_BURST_MAX_DATA	20
#define ADIS16475_MAX_SCAN_DATA		20
/* spi max speed in brust mode */
#define ADIS16475_BURST_MAX_SPEED	1000000
#define ADIS16475_LSB_DEC_MASK		BIT(0)
#define ADIS16475_LSB_FIR_MASK		BIT(1)

enum {
	ADIS16475_SYNC_DIRECT = 1,
	ADIS16475_SYNC_SCALED,
	ADIS16475_SYNC_OUTPUT,
	ADIS16475_SYNC_PULSE = 5,
};

struct adis16475_sync {
	u16 sync_mode;
	u16 min_rate;
	u16 max_rate;
};

struct adis16475_chip_info {
	const struct iio_chan_spec *channels;
	const struct adis16475_sync *sync;
	const struct adis_data adis_data;
	const char *name;
	u32 num_channels;
	u32 gyro_max_val;
	u32 gyro_max_scale;
	u32 accel_max_val;
	u32 accel_max_scale;
	u32 temp_scale;
	u32 int_clk;
	u16 max_dec;
	u8 num_sync;
	bool has_burst32;
};

struct adis16475 {
	const struct adis16475_chip_info *info;
	struct adis adis;
	u32 clk_freq;
	bool burst32;
	unsigned long lsb_flag;
	u16 sync_mode;
	/* Alignment needed for the timestamp */
	__be16 data[ADIS16475_MAX_SCAN_DATA] __aligned(8);
};

enum {
	ADIS16475_SCAN_GYRO_X,
	ADIS16475_SCAN_GYRO_Y,
	ADIS16475_SCAN_GYRO_Z,
	ADIS16475_SCAN_ACCEL_X,
	ADIS16475_SCAN_ACCEL_Y,
	ADIS16475_SCAN_ACCEL_Z,
	ADIS16475_SCAN_TEMP,
	ADIS16475_SCAN_DIAG_S_FLAGS,
	ADIS16475_SCAN_CRC_FAILURE,
};

static bool low_rate_allow;
module_param(low_rate_allow, bool, 0444);
MODULE_PARM_DESC(low_rate_allow,
		 "Allow IMU rates below the minimum advisable when external clk is used in SCALED mode (default: N)");

#ifdef CONFIG_DEBUG_FS
static ssize_t adis16475_show_firmware_revision(struct file *file,
						char __user *userbuf,
						size_t count, loff_t *ppos)
{
	struct adis16475 *st = file->private_data;
	char buf[7];
	size_t len;
	u16 rev;
	int ret;

	ret = adis_read_reg_16(&st->adis, ADIS16475_REG_FIRM_REV, &rev);
	if (ret)
		return ret;

	len = scnprintf(buf, sizeof(buf), "%x.%x\n", rev >> 8, rev & 0xff);

	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}

static const struct file_operations adis16475_firmware_revision_fops = {
	.open = simple_open,
	.read = adis16475_show_firmware_revision,
	.llseek = default_llseek,
	.owner = THIS_MODULE,
};

static ssize_t adis16475_show_firmware_date(struct file *file,
					    char __user *userbuf,
					    size_t count, loff_t *ppos)
{
	struct adis16475 *st = file->private_data;
	u16 md, year;
	char buf[12];
	size_t len;
	int ret;

	ret = adis_read_reg_16(&st->adis, ADIS16475_REG_FIRM_Y, &year);
	if (ret)
		return ret;

	ret = adis_read_reg_16(&st->adis, ADIS16475_REG_FIRM_DM, &md);
	if (ret)
		return ret;

	len = snprintf(buf, sizeof(buf), "%.2x-%.2x-%.4x\n", md >> 8, md & 0xff,
		       year);

	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}

static const struct file_operations adis16475_firmware_date_fops = {
	.open = simple_open,
	.read = adis16475_show_firmware_date,
	.llseek = default_llseek,
	.owner = THIS_MODULE,
};

static int adis16475_show_serial_number(void *arg, u64 *val)
{
	struct adis16475 *st = arg;
	u16 serial;
	int ret;

	ret = adis_read_reg_16(&st->adis, ADIS16475_REG_SERIAL_NUM, &serial);
	if (ret)
		return ret;

	*val = serial;

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16475_serial_number_fops,
			 adis16475_show_serial_number, NULL, "0x%.4llx\n");

static int adis16475_show_product_id(void *arg, u64 *val)
{
	struct adis16475 *st = arg;
	u16 prod_id;
	int ret;

	ret = adis_read_reg_16(&st->adis, ADIS16475_REG_PROD_ID, &prod_id);
	if (ret)
		return ret;

	*val = prod_id;

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16475_product_id_fops,
			 adis16475_show_product_id, NULL, "%llu\n");

static int adis16475_show_flash_count(void *arg, u64 *val)
{
	struct adis16475 *st = arg;
	u32 flash_count;
	int ret;

	ret = adis_read_reg_32(&st->adis, ADIS16475_REG_FLASH_CNT,
			       &flash_count);
	if (ret)
		return ret;

	*val = flash_count;

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(adis16475_flash_count_fops,
			 adis16475_show_flash_count, NULL, "%lld\n");

static void adis16475_debugfs_init(struct iio_dev *indio_dev)
{
	struct adis16475 *st = iio_priv(indio_dev);
	struct dentry *d = iio_get_debugfs_dentry(indio_dev);

	debugfs_create_file_unsafe("serial_number", 0400,
				   d, st, &adis16475_serial_number_fops);
	debugfs_create_file_unsafe("product_id", 0400,
				   d, st, &adis16475_product_id_fops);
	debugfs_create_file_unsafe("flash_count", 0400,
				   d, st, &adis16475_flash_count_fops);
	debugfs_create_file("firmware_revision", 0400,
			    d, st, &adis16475_firmware_revision_fops);
	debugfs_create_file("firmware_date", 0400, d,
			    st, &adis16475_firmware_date_fops);
}
#else
static void adis16475_debugfs_init(struct iio_dev *indio_dev)
{
}
#endif

static int adis16475_get_freq(struct adis16475 *st, u32 *freq)
{
	int ret;
	u16 dec;
	u32 sample_rate = st->clk_freq;

	adis_dev_lock(&st->adis);

	if (st->sync_mode == ADIS16475_SYNC_SCALED) {
		u16 sync_scale;

		ret = __adis_read_reg_16(&st->adis, ADIS16475_REG_UP_SCALE, &sync_scale);
		if (ret)
			goto error;

		sample_rate = st->clk_freq * sync_scale;
	}

	ret = __adis_read_reg_16(&st->adis, ADIS16475_REG_DEC_RATE, &dec);
	if (ret)
		goto error;

	adis_dev_unlock(&st->adis);

	*freq = DIV_ROUND_CLOSEST(sample_rate, dec + 1);

	return 0;
error:
	adis_dev_unlock(&st->adis);
	return ret;
}

static int adis16475_set_freq(struct adis16475 *st, const u32 freq)
{
	u16 dec;
	int ret;
	u32 sample_rate = st->clk_freq;

	if (!freq)
		return -EINVAL;

	adis_dev_lock(&st->adis);
	/*
	 * When using sync scaled mode, the input clock needs to be scaled so that we have
	 * an IMU sample rate between (optimally) 1900 and 2100. After this, we can use the
	 * decimation filter to lower the sampling rate in order to get what the user wants.
	 * Optimally, the user sample rate is a multiple of both the IMU sample rate and
	 * the input clock. Hence, calculating the sync_scale dynamically gives us better
	 * chances of achieving a perfect/integer value for DEC_RATE. The math here is:
	 *	1. lcm of the input clock and the desired output rate.
	 *	2. get the highest multiple of the previous result lower than the adis max rate.
	 *	3. The last result becomes the IMU sample rate. Use that to calculate SYNC_SCALE
	 *	   and DEC_RATE (to get the user output rate)
	 */
	if (st->sync_mode == ADIS16475_SYNC_SCALED) {
		unsigned long scaled_rate = lcm(st->clk_freq, freq);
		int sync_scale;

		/*
		 * If lcm is bigger than the IMU maximum sampling rate there's no perfect
		 * solution. In this case, we get the highest multiple of the input clock
		 * lower than the IMU max sample rate.
		 */
		if (scaled_rate > 2100000)
			scaled_rate = 2100000 / st->clk_freq * st->clk_freq;
		else
			scaled_rate = 2100000 / scaled_rate * scaled_rate;

		/*
		 * This is not an hard requirement but it's not advised to run the IMU
		 * with a sample rate lower than 4000Hz due to possible undersampling
		 * issues. However, there are users that might really want to take the risk.
		 * Hence, we provide a module parameter for them. If set, we allow sample
		 * rates lower than 4KHz. By default, we won't allow this and we just roundup
		 * the rate to the next multiple of the input clock bigger than 4KHz. This
		 * is done like this as in some cases (when DEC_RATE is 0) might give
		 * us the closest value to the one desired by the user...
		 */
		if (scaled_rate < 1900000 && !low_rate_allow)
			scaled_rate = roundup(1900000, st->clk_freq);

		sync_scale = scaled_rate / st->clk_freq;
		ret = __adis_write_reg_16(&st->adis, ADIS16475_REG_UP_SCALE, sync_scale);
		if (ret)
			goto error;

		sample_rate = scaled_rate;
	}

	dec = DIV_ROUND_CLOSEST(sample_rate, freq);

	if (dec)
		dec--;

	if (dec > st->info->max_dec)
		dec = st->info->max_dec;

	ret = __adis_write_reg_16(&st->adis, ADIS16475_REG_DEC_RATE, dec);
	if (ret)
		goto error;

	adis_dev_unlock(&st->adis);
	/*
	 * If decimation is used, then gyro and accel data will have meaningful
	 * bits on the LSB registers. This info is used on the trigger handler.
	 */
	assign_bit(ADIS16475_LSB_DEC_MASK, &st->lsb_flag, dec);

	return 0;
error:
	adis_dev_unlock(&st->adis);
	return ret;
}

/* The values are approximated. */
static const u32 adis16475_3db_freqs[] = {
	[0] = 720, /* Filter disabled, full BW (~720Hz) */
	[1] = 360,
	[2] = 164,
	[3] = 80,
	[4] = 40,
	[5] = 20,
	[6] = 10,
};

static int adis16475_get_filter(struct adis16475 *st, u32 *filter)
{
	u16 filter_sz;
	int ret;
	const int mask = ADIS16475_FILT_CTRL_MASK;

	ret = adis_read_reg_16(&st->adis, ADIS16475_REG_FILT_CTRL, &filter_sz);
	if (ret)
		return ret;

	*filter = adis16475_3db_freqs[filter_sz & mask];

	return 0;
}

static int adis16475_set_filter(struct adis16475 *st, const u32 filter)
{
	int i = ARRAY_SIZE(adis16475_3db_freqs);
	int ret;

	while (--i) {
		if (adis16475_3db_freqs[i] >= filter)
			break;
	}

	ret = adis_write_reg_16(&st->adis, ADIS16475_REG_FILT_CTRL,
				ADIS16475_FILT_CTRL(i));
	if (ret)
		return ret;

	/*
	 * If FIR is used, then gyro and accel data will have meaningful
	 * bits on the LSB registers. This info is used on the trigger handler.
	 */
	assign_bit(ADIS16475_LSB_FIR_MASK, &st->lsb_flag, i);

	return 0;
}

static const u32 adis16475_calib_regs[] = {
	[ADIS16475_SCAN_GYRO_X] = ADIS16475_REG_X_GYRO_BIAS_L,
	[ADIS16475_SCAN_GYRO_Y] = ADIS16475_REG_Y_GYRO_BIAS_L,
	[ADIS16475_SCAN_GYRO_Z] = ADIS16475_REG_Z_GYRO_BIAS_L,
	[ADIS16475_SCAN_ACCEL_X] = ADIS16475_REG_X_ACCEL_BIAS_L,
	[ADIS16475_SCAN_ACCEL_Y] = ADIS16475_REG_Y_ACCEL_BIAS_L,
	[ADIS16475_SCAN_ACCEL_Z] = ADIS16475_REG_Z_ACCEL_BIAS_L,
};

static int adis16475_read_raw(struct iio_dev *indio_dev,
			      const struct iio_chan_spec *chan,
			      int *val, int *val2, long info)
{
	struct adis16475 *st = iio_priv(indio_dev);
	int ret;
	u32 tmp;

	switch (info) {
	case IIO_CHAN_INFO_RAW:
		return adis_single_conversion(indio_dev, chan, 0, val);
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_ANGL_VEL:
			*val = st->info->gyro_max_val;
			*val2 = st->info->gyro_max_scale;
			return IIO_VAL_FRACTIONAL;
		case IIO_ACCEL:
			*val = st->info->accel_max_val;
			*val2 = st->info->accel_max_scale;
			return IIO_VAL_FRACTIONAL;
		case IIO_TEMP:
			*val = st->info->temp_scale;
			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_CALIBBIAS:
		ret = adis_read_reg_32(&st->adis,
				       adis16475_calib_regs[chan->scan_index],
				       val);
		if (ret)
			return ret;

		return IIO_VAL_INT;
	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
		ret = adis16475_get_filter(st, val);
		if (ret)
			return ret;

		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SAMP_FREQ:
		ret = adis16475_get_freq(st, &tmp);
		if (ret)
			return ret;

		*val = tmp / 1000;
		*val2 = (tmp % 1000) * 1000;
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

static int adis16475_write_raw(struct iio_dev *indio_dev,
			       const struct iio_chan_spec *chan,
			       int val, int val2, long info)
{
	struct adis16475 *st = iio_priv(indio_dev);
	u32 tmp;

	switch (info) {
	case IIO_CHAN_INFO_SAMP_FREQ:
		tmp = val * 1000 + val2 / 1000;
		return adis16475_set_freq(st, tmp);
	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
		return adis16475_set_filter(st, val);
	case IIO_CHAN_INFO_CALIBBIAS:
		return adis_write_reg_32(&st->adis,
					 adis16475_calib_regs[chan->scan_index],
					 val);
	default:
		return -EINVAL;
	}
}

#define ADIS16475_MOD_CHAN(_type, _mod, _address, _si, _r_bits, _s_bits) \
	{ \
		.type = (_type), \
		.modified = 1, \
		.channel2 = (_mod), \
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
			BIT(IIO_CHAN_INFO_CALIBBIAS), \
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
		.address = (_address), \
		.scan_index = (_si), \
		.scan_type = { \
			.sign = 's', \
			.realbits = (_r_bits), \
			.storagebits = (_s_bits), \
			.endianness = IIO_BE, \
		}, \
	}

#define ADIS16475_GYRO_CHANNEL(_mod) \
	ADIS16475_MOD_CHAN(IIO_ANGL_VEL, IIO_MOD_ ## _mod, \
			   ADIS16475_REG_ ## _mod ## _GYRO_L, \
			   ADIS16475_SCAN_GYRO_ ## _mod, 32, 32)

#define ADIS16475_ACCEL_CHANNEL(_mod) \
	ADIS16475_MOD_CHAN(IIO_ACCEL, IIO_MOD_ ## _mod, \
			   ADIS16475_REG_ ## _mod ## _ACCEL_L, \
			   ADIS16475_SCAN_ACCEL_ ## _mod, 32, 32)

#define ADIS16475_TEMP_CHANNEL() { \
		.type = IIO_TEMP, \
		.indexed = 1, \
		.channel = 0, \
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
			BIT(IIO_CHAN_INFO_SCALE), \
		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
			BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
		.address = ADIS16475_REG_TEMP_OUT, \
		.scan_index = ADIS16475_SCAN_TEMP, \
		.scan_type = { \
			.sign = 's', \
			.realbits = 16, \
			.storagebits = 16, \
			.endianness = IIO_BE, \
		}, \
	}

static const struct iio_chan_spec adis16475_channels[] = {
	ADIS16475_GYRO_CHANNEL(X),
	ADIS16475_GYRO_CHANNEL(Y),
	ADIS16475_GYRO_CHANNEL(Z),
	ADIS16475_ACCEL_CHANNEL(X),
	ADIS16475_ACCEL_CHANNEL(Y),
	ADIS16475_ACCEL_CHANNEL(Z),
	ADIS16475_TEMP_CHANNEL(),
	IIO_CHAN_SOFT_TIMESTAMP(7)
};

enum adis16475_variant {
	ADIS16470,
	ADIS16475_1,
	ADIS16475_2,
	ADIS16475_3,
	ADIS16477_1,
	ADIS16477_2,
	ADIS16477_3,
	ADIS16465_1,
	ADIS16465_2,
	ADIS16465_3,
	ADIS16467_1,
	ADIS16467_2,
	ADIS16467_3,
	ADIS16500,
	ADIS16505_1,
	ADIS16505_2,
	ADIS16505_3,
	ADIS16507_1,
	ADIS16507_2,
	ADIS16507_3,
};

enum {
	ADIS16475_DIAG_STAT_DATA_PATH = 1,
	ADIS16475_DIAG_STAT_FLASH_MEM,
	ADIS16475_DIAG_STAT_SPI,
	ADIS16475_DIAG_STAT_STANDBY,
	ADIS16475_DIAG_STAT_SENSOR,
	ADIS16475_DIAG_STAT_MEMORY,
	ADIS16475_DIAG_STAT_CLK,
};

static const char * const adis16475_status_error_msgs[] = {
	[ADIS16475_DIAG_STAT_DATA_PATH] = "Data Path Overrun",
	[ADIS16475_DIAG_STAT_FLASH_MEM] = "Flash memory update failure",
	[ADIS16475_DIAG_STAT_SPI] = "SPI communication error",
	[ADIS16475_DIAG_STAT_STANDBY] = "Standby mode",
	[ADIS16475_DIAG_STAT_SENSOR] = "Sensor failure",
	[ADIS16475_DIAG_STAT_MEMORY] = "Memory failure",
	[ADIS16475_DIAG_STAT_CLK] = "Clock error",
};

#define ADIS16475_DATA(_prod_id, _timeouts)				\
{									\
	.msc_ctrl_reg = ADIS16475_REG_MSG_CTRL,				\
	.glob_cmd_reg = ADIS16475_REG_GLOB_CMD,				\
	.diag_stat_reg = ADIS16475_REG_DIAG_STAT,			\
	.prod_id_reg = ADIS16475_REG_PROD_ID,				\
	.prod_id = (_prod_id),						\
	.self_test_mask = BIT(2),					\
	.self_test_reg = ADIS16475_REG_GLOB_CMD,			\
	.cs_change_delay = 16,						\
	.read_delay = 5,						\
	.write_delay = 5,						\
	.status_error_msgs = adis16475_status_error_msgs,		\
	.status_error_mask = BIT(ADIS16475_DIAG_STAT_DATA_PATH) |	\
		BIT(ADIS16475_DIAG_STAT_FLASH_MEM) |			\
		BIT(ADIS16475_DIAG_STAT_SPI) |				\
		BIT(ADIS16475_DIAG_STAT_STANDBY) |			\
		BIT(ADIS16475_DIAG_STAT_SENSOR) |			\
		BIT(ADIS16475_DIAG_STAT_MEMORY) |			\
		BIT(ADIS16475_DIAG_STAT_CLK),				\
	.unmasked_drdy = true,						\
	.timeouts = (_timeouts),					\
	.burst_reg_cmd = ADIS16475_REG_GLOB_CMD,			\
	.burst_len = ADIS16475_BURST_MAX_DATA,				\
	.burst_max_len = ADIS16475_BURST32_MAX_DATA,			\
	.burst_max_speed_hz = ADIS16475_BURST_MAX_SPEED			\
}

static const struct adis16475_sync adis16475_sync_mode[] = {
	{ ADIS16475_SYNC_OUTPUT },
	{ ADIS16475_SYNC_DIRECT, 1900, 2100 },
	{ ADIS16475_SYNC_SCALED, 1, 128 },
	{ ADIS16475_SYNC_PULSE, 1000, 2100 },
};

static const struct adis_timeout adis16475_timeouts = {
	.reset_ms = 200,
	.sw_reset_ms = 200,
	.self_test_ms = 20,
};

static const struct adis_timeout adis1650x_timeouts = {
	.reset_ms = 260,
	.sw_reset_ms = 260,
	.self_test_ms = 30,
};

static const struct adis16475_chip_info adis16475_chip_info[] = {
	[ADIS16470] = {
		.name = "adis16470",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(800 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16470, &adis16475_timeouts),
	},
	[ADIS16475_1] = {
		.name = "adis16475-1",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(160 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(4000 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16475, &adis16475_timeouts),
	},
	[ADIS16475_2] = {
		.name = "adis16475-2",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(40 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(4000 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16475, &adis16475_timeouts),
	},
	[ADIS16475_3] = {
		.name = "adis16475-3",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(4000 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16475, &adis16475_timeouts),
	},
	[ADIS16477_1] = {
		.name = "adis16477-1",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(160 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(800 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16477, &adis16475_timeouts),
	},
	[ADIS16477_2] = {
		.name = "adis16477-2",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(40 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(800 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16477, &adis16475_timeouts),
	},
	[ADIS16477_3] = {
		.name = "adis16477-3",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(800 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16477, &adis16475_timeouts),
	},
	[ADIS16465_1] = {
		.name = "adis16465-1",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(160 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(4000 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16465, &adis16475_timeouts),
	},
	[ADIS16465_2] = {
		.name = "adis16465-2",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(40 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(4000 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16465, &adis16475_timeouts),
	},
	[ADIS16465_3] = {
		.name = "adis16465-3",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(4000 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16465, &adis16475_timeouts),
	},
	[ADIS16467_1] = {
		.name = "adis16467-1",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(160 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(800 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16467, &adis16475_timeouts),
	},
	[ADIS16467_2] = {
		.name = "adis16467-2",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(40 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(800 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16467, &adis16475_timeouts),
	},
	[ADIS16467_3] = {
		.name = "adis16467-3",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 1,
		.accel_max_scale = IIO_M_S_2_TO_G(800 << 16),
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		.num_sync = ARRAY_SIZE(adis16475_sync_mode),
		.adis_data = ADIS16475_DATA(16467, &adis16475_timeouts),
	},
	[ADIS16500] = {
		.name = "adis16500",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 392,
		.accel_max_scale = 32000 << 16,
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		/* pulse sync not supported */
		.num_sync = ARRAY_SIZE(adis16475_sync_mode) - 1,
		.has_burst32 = true,
		.adis_data = ADIS16475_DATA(16500, &adis1650x_timeouts),
	},
	[ADIS16505_1] = {
		.name = "adis16505-1",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(160 << 16),
		.accel_max_val = 78,
		.accel_max_scale = 32000 << 16,
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		/* pulse sync not supported */
		.num_sync = ARRAY_SIZE(adis16475_sync_mode) - 1,
		.has_burst32 = true,
		.adis_data = ADIS16475_DATA(16505, &adis1650x_timeouts),
	},
	[ADIS16505_2] = {
		.name = "adis16505-2",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(40 << 16),
		.accel_max_val = 78,
		.accel_max_scale = 32000 << 16,
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		/* pulse sync not supported */
		.num_sync = ARRAY_SIZE(adis16475_sync_mode) - 1,
		.has_burst32 = true,
		.adis_data = ADIS16475_DATA(16505, &adis1650x_timeouts),
	},
	[ADIS16505_3] = {
		.name = "adis16505-3",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 78,
		.accel_max_scale = 32000 << 16,
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		/* pulse sync not supported */
		.num_sync = ARRAY_SIZE(adis16475_sync_mode) - 1,
		.has_burst32 = true,
		.adis_data = ADIS16475_DATA(16505, &adis1650x_timeouts),
	},
	[ADIS16507_1] = {
		.name = "adis16507-1",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(160 << 16),
		.accel_max_val = 392,
		.accel_max_scale = 32000 << 16,
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		/* pulse sync not supported */
		.num_sync = ARRAY_SIZE(adis16475_sync_mode) - 1,
		.has_burst32 = true,
		.adis_data = ADIS16475_DATA(16507, &adis1650x_timeouts),
	},
	[ADIS16507_2] = {
		.name = "adis16507-2",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(40 << 16),
		.accel_max_val = 392,
		.accel_max_scale = 32000 << 16,
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		/* pulse sync not supported */
		.num_sync = ARRAY_SIZE(adis16475_sync_mode) - 1,
		.has_burst32 = true,
		.adis_data = ADIS16475_DATA(16507, &adis1650x_timeouts),
	},
	[ADIS16507_3] = {
		.name = "adis16507-3",
		.num_channels = ARRAY_SIZE(adis16475_channels),
		.channels = adis16475_channels,
		.gyro_max_val = 1,
		.gyro_max_scale = IIO_RAD_TO_DEGREE(10 << 16),
		.accel_max_val = 392,
		.accel_max_scale = 32000 << 16,
		.temp_scale = 100,
		.int_clk = 2000,
		.max_dec = 1999,
		.sync = adis16475_sync_mode,
		/* pulse sync not supported */
		.num_sync = ARRAY_SIZE(adis16475_sync_mode) - 1,
		.has_burst32 = true,
		.adis_data = ADIS16475_DATA(16507, &adis1650x_timeouts),
	},
};

static const struct iio_info adis16475_info = {
	.read_raw = &adis16475_read_raw,
	.write_raw = &adis16475_write_raw,
	.update_scan_mode = adis_update_scan_mode,
	.debugfs_reg_access = adis_debugfs_reg_access,
};

static bool adis16475_validate_crc(const u8 *buffer, u16 crc,
				   const bool burst32)
{
	int i;
	/* extra 6 elements for low gyro and accel */
	const u16 sz = burst32 ? ADIS16475_BURST32_MAX_DATA :
		ADIS16475_BURST_MAX_DATA;

	for (i = 0; i < sz - 2; i++)
		crc -= buffer[i];

	return crc == 0;
}

static void adis16475_burst32_check(struct adis16475 *st)
{
	int ret;
	struct adis *adis = &st->adis;

	if (!st->info->has_burst32)
		return;

	if (st->lsb_flag && !st->burst32) {
		const u16 en = ADIS16500_BURST32(1);

		ret = __adis_update_bits(&st->adis, ADIS16475_REG_MSG_CTRL,
					 ADIS16500_BURST32_MASK, en);
		if (ret)
			return;

		st->burst32 = true;

		/*
		 * In 32-bit mode we need extra 2 bytes for all gyro
		 * and accel channels.
		 */
		adis->burst_extra_len = 6 * sizeof(u16);
		adis->xfer[1].len += 6 * sizeof(u16);
		dev_dbg(&adis->spi->dev, "Enable burst32 mode, xfer:%d",
			adis->xfer[1].len);

	} else if (!st->lsb_flag && st->burst32) {
		const u16 en = ADIS16500_BURST32(0);

		ret = __adis_update_bits(&st->adis, ADIS16475_REG_MSG_CTRL,
					 ADIS16500_BURST32_MASK, en);
		if (ret)
			return;

		st->burst32 = false;

		/* Remove the extra bits */
		adis->burst_extra_len = 0;
		adis->xfer[1].len -= 6 * sizeof(u16);
		dev_dbg(&adis->spi->dev, "Disable burst32 mode, xfer:%d\n",
			adis->xfer[1].len);
	}
}

static irqreturn_t adis16475_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct adis16475 *st = iio_priv(indio_dev);
	struct adis *adis = &st->adis;
	int ret, bit, i = 0;
	__be16 *buffer;
	u16 crc;
	bool valid;
	/* offset until the first element after gyro and accel */
	const u8 offset = st->burst32 ? 13 : 7;

	ret = spi_sync(adis->spi, &adis->msg);
	if (ret)
		goto check_burst32;

	buffer = adis->buffer;

	crc = be16_to_cpu(buffer[offset + 2]);
	valid = adis16475_validate_crc(adis->buffer, crc, st->burst32);
	if (!valid) {
		dev_err(&adis->spi->dev, "Invalid crc\n");
		goto check_burst32;
	}

	for_each_set_bit(bit, indio_dev->active_scan_mask,
			 indio_dev->masklength) {
		/*
		 * When burst mode is used, system flags is the first data
		 * channel in the sequence, but the scan index is 7.
		 */
		switch (bit) {
		case ADIS16475_SCAN_TEMP:
			st->data[i++] = buffer[offset];
			break;
		case ADIS16475_SCAN_GYRO_X ... ADIS16475_SCAN_ACCEL_Z:
			/*
			 * The first 2 bytes on the received data are the
			 * DIAG_STAT reg, hence the +1 offset here...
			 */
			if (st->burst32) {
				/* upper 16 */
				st->data[i++] = buffer[bit * 2 + 2];
				/* lower 16 */
				st->data[i++] = buffer[bit * 2 + 1];
			} else {
				st->data[i++] = buffer[bit + 1];
				/*
				 * Don't bother in doing the manual read if the
				 * device supports burst32. burst32 will be
				 * enabled in the next call to
				 * adis16475_burst32_check()...
				 */
				if (st->lsb_flag && !st->info->has_burst32) {
					u16 val = 0;
					const u32 reg = ADIS16475_REG_X_GYRO_L +
						bit * 4;

					adis_read_reg_16(adis, reg, &val);
					st->data[i++] = cpu_to_be16(val);
				} else {
					/* lower not used */
					st->data[i++] = 0;
				}
			}
			break;
		}
	}

	iio_push_to_buffers_with_timestamp(indio_dev, st->data, pf->timestamp);
check_burst32:
	/*
	 * We only check the burst mode at the end of the current capture since
	 * it takes a full data ready cycle for the device to update the burst
	 * array.
	 */
	adis16475_burst32_check(st);
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static int adis16475_config_sync_mode(struct adis16475 *st)
{
	int ret;
	struct device *dev = &st->adis.spi->dev;
	const struct adis16475_sync *sync;
	u32 sync_mode;

	/* default to internal clk */
	st->clk_freq = st->info->int_clk * 1000;

	ret = device_property_read_u32(dev, "adi,sync-mode", &sync_mode);
	if (ret)
		return 0;

	if (sync_mode >= st->info->num_sync) {
		dev_err(dev, "Invalid sync mode: %u for %s\n", sync_mode,
			st->info->name);
		return -EINVAL;
	}

	sync = &st->info->sync[sync_mode];
	st->sync_mode = sync->sync_mode;

	/* All the other modes require external input signal */
	if (sync->sync_mode != ADIS16475_SYNC_OUTPUT) {
		struct clk *clk = devm_clk_get_enabled(dev, NULL);

		if (IS_ERR(clk))
			return PTR_ERR(clk);

		st->clk_freq = clk_get_rate(clk);
		if (st->clk_freq < sync->min_rate ||
		    st->clk_freq > sync->max_rate) {
			dev_err(dev,
				"Clk rate:%u not in a valid range:[%u %u]\n",
				st->clk_freq, sync->min_rate, sync->max_rate);
			return -EINVAL;
		}

		if (sync->sync_mode == ADIS16475_SYNC_SCALED) {
			u16 up_scale;

			/*
			 * In sync scaled mode, the IMU sample rate is the clk_freq * sync_scale.
			 * Hence, default the IMU sample rate to the highest multiple of the input
			 * clock lower than the IMU max sample rate. The optimal range is
			 * 1900-2100 sps...
			 */
			up_scale = 2100 / st->clk_freq;

			ret = __adis_write_reg_16(&st->adis,
						  ADIS16475_REG_UP_SCALE,
						  up_scale);
			if (ret)
				return ret;
		}

		st->clk_freq *= 1000;
	}
	/*
	 * Keep in mind that the mask for the clk modes in adis1650*
	 * chips is different (1100 instead of 11100). However, we
	 * are not configuring BIT(4) in these chips and the default
	 * value is 0, so we are fine in doing the below operations.
	 * I'm keeping this for simplicity and avoiding extra variables
	 * in chip_info.
	 */
	ret = __adis_update_bits(&st->adis, ADIS16475_REG_MSG_CTRL,
				 ADIS16475_SYNC_MODE_MASK, sync->sync_mode);
	if (ret)
		return ret;

	usleep_range(250, 260);

	return 0;
}

static int adis16475_config_irq_pin(struct adis16475 *st)
{
	int ret;
	struct irq_data *desc;
	u32 irq_type;
	u16 val = 0;
	u8 polarity;
	struct spi_device *spi = st->adis.spi;

	desc = irq_get_irq_data(spi->irq);
	if (!desc) {
		dev_err(&spi->dev, "Could not find IRQ %d\n", spi->irq);
		return -EINVAL;
	}
	/*
	 * It is possible to configure the data ready polarity. Furthermore, we
	 * need to update the adis struct if we want data ready as active low.
	 */
	irq_type = irqd_get_trigger_type(desc);
	if (irq_type == IRQ_TYPE_EDGE_RISING) {
		polarity = 1;
		st->adis.irq_flag = IRQF_TRIGGER_RISING;
	} else if (irq_type == IRQ_TYPE_EDGE_FALLING) {
		polarity = 0;
		st->adis.irq_flag = IRQF_TRIGGER_FALLING;
	} else {
		dev_err(&spi->dev, "Invalid interrupt type 0x%x specified\n",
			irq_type);
		return -EINVAL;
	}

	val = ADIS16475_MSG_CTRL_DR_POL(polarity);
	ret = __adis_update_bits(&st->adis, ADIS16475_REG_MSG_CTRL,
				 ADIS16475_MSG_CTRL_DR_POL_MASK, val);
	if (ret)
		return ret;
	/*
	 * There is a delay writing to any bits written to the MSC_CTRL
	 * register. It should not be bigger than 200us, so 250 should be more
	 * than enough!
	 */
	usleep_range(250, 260);

	return 0;
}

static const struct of_device_id adis16475_of_match[] = {
	{ .compatible = "adi,adis16470",
		.data = &adis16475_chip_info[ADIS16470] },
	{ .compatible = "adi,adis16475-1",
		.data = &adis16475_chip_info[ADIS16475_1] },
	{ .compatible = "adi,adis16475-2",
		.data = &adis16475_chip_info[ADIS16475_2] },
	{ .compatible = "adi,adis16475-3",
		.data = &adis16475_chip_info[ADIS16475_3] },
	{ .compatible = "adi,adis16477-1",
		.data = &adis16475_chip_info[ADIS16477_1] },
	{ .compatible = "adi,adis16477-2",
		.data = &adis16475_chip_info[ADIS16477_2] },
	{ .compatible = "adi,adis16477-3",
		.data = &adis16475_chip_info[ADIS16477_3] },
	{ .compatible = "adi,adis16465-1",
		.data = &adis16475_chip_info[ADIS16465_1] },
	{ .compatible = "adi,adis16465-2",
		.data = &adis16475_chip_info[ADIS16465_2] },
	{ .compatible = "adi,adis16465-3",
		.data = &adis16475_chip_info[ADIS16465_3] },
	{ .compatible = "adi,adis16467-1",
		.data = &adis16475_chip_info[ADIS16467_1] },
	{ .compatible = "adi,adis16467-2",
		.data = &adis16475_chip_info[ADIS16467_2] },
	{ .compatible = "adi,adis16467-3",
		.data = &adis16475_chip_info[ADIS16467_3] },
	{ .compatible = "adi,adis16500",
		.data = &adis16475_chip_info[ADIS16500] },
	{ .compatible = "adi,adis16505-1",
		.data = &adis16475_chip_info[ADIS16505_1] },
	{ .compatible = "adi,adis16505-2",
		.data = &adis16475_chip_info[ADIS16505_2] },
	{ .compatible = "adi,adis16505-3",
		.data = &adis16475_chip_info[ADIS16505_3] },
	{ .compatible = "adi,adis16507-1",
		.data = &adis16475_chip_info[ADIS16507_1] },
	{ .compatible = "adi,adis16507-2",
		.data = &adis16475_chip_info[ADIS16507_2] },
	{ .compatible = "adi,adis16507-3",
		.data = &adis16475_chip_info[ADIS16507_3] },
	{ },
};
MODULE_DEVICE_TABLE(of, adis16475_of_match);

static int adis16475_probe(struct spi_device *spi)
{
	struct iio_dev *indio_dev;
	struct adis16475 *st;
	int ret;

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

	st = iio_priv(indio_dev);

	st->info = device_get_match_data(&spi->dev);
	if (!st->info)
		return -EINVAL;

	ret = adis_init(&st->adis, indio_dev, spi, &st->info->adis_data);
	if (ret)
		return ret;

	indio_dev->name = st->info->name;
	indio_dev->channels = st->info->channels;
	indio_dev->num_channels = st->info->num_channels;
	indio_dev->info = &adis16475_info;
	indio_dev->modes = INDIO_DIRECT_MODE;

	ret = __adis_initial_startup(&st->adis);
	if (ret)
		return ret;

	ret = adis16475_config_irq_pin(st);
	if (ret)
		return ret;

	ret = adis16475_config_sync_mode(st);
	if (ret)
		return ret;

	ret = devm_adis_setup_buffer_and_trigger(&st->adis, indio_dev,
						 adis16475_trigger_handler);
	if (ret)
		return ret;

	ret = devm_iio_device_register(&spi->dev, indio_dev);
	if (ret)
		return ret;

	adis16475_debugfs_init(indio_dev);

	return 0;
}

static struct spi_driver adis16475_driver = {
	.driver = {
		.name = "adis16475",
		.of_match_table = adis16475_of_match,
	},
	.probe = adis16475_probe,
};
module_spi_driver(adis16475_driver);

MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
MODULE_DESCRIPTION("Analog Devices ADIS16475 IMU driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(IIO_ADISLIB);