summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/si1145.c
blob: 76f16f9c7616401141c0697c27c2c8986e7c4614 (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
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
/*
 * si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient
 * light, UV index and proximity sensors
 *
 * Copyright 2014-16 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
 * Copyright 2016 Crestez Dan Leonard <leonard.crestez@intel.com>
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License.  See the file COPYING in the main
 * directory of this archive for more details.
 *
 * SI1132 (7-bit I2C slave address 0x60)
 * SI1141/2/3 (7-bit I2C slave address 0x5a)
 * SI1145/6/6 (7-bit I2C slave address 0x60)
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/gpio.h>

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

#define SI1145_REG_PART_ID		0x00
#define SI1145_REG_REV_ID		0x01
#define SI1145_REG_SEQ_ID		0x02
#define SI1145_REG_INT_CFG		0x03
#define SI1145_REG_IRQ_ENABLE		0x04
#define SI1145_REG_IRQ_MODE		0x05
#define SI1145_REG_HW_KEY		0x07
#define SI1145_REG_MEAS_RATE		0x08
#define SI1145_REG_PS_LED21		0x0f
#define SI1145_REG_PS_LED3		0x10
#define SI1145_REG_UCOEF1		0x13
#define SI1145_REG_UCOEF2		0x14
#define SI1145_REG_UCOEF3		0x15
#define SI1145_REG_UCOEF4		0x16
#define SI1145_REG_PARAM_WR		0x17
#define SI1145_REG_COMMAND		0x18
#define SI1145_REG_RESPONSE		0x20
#define SI1145_REG_IRQ_STATUS		0x21
#define SI1145_REG_ALSVIS_DATA		0x22
#define SI1145_REG_ALSIR_DATA		0x24
#define SI1145_REG_PS1_DATA		0x26
#define SI1145_REG_PS2_DATA		0x28
#define SI1145_REG_PS3_DATA		0x2a
#define SI1145_REG_AUX_DATA		0x2c
#define SI1145_REG_PARAM_RD		0x2e
#define SI1145_REG_CHIP_STAT		0x30

#define SI1145_UCOEF1_DEFAULT		0x7b
#define SI1145_UCOEF2_DEFAULT		0x6b
#define SI1145_UCOEF3_DEFAULT		0x01
#define SI1145_UCOEF4_DEFAULT		0x00

/* Helper to figure out PS_LED register / shift per channel */
#define SI1145_PS_LED_REG(ch) \
	(((ch) == 2) ? SI1145_REG_PS_LED3 : SI1145_REG_PS_LED21)
#define SI1145_PS_LED_SHIFT(ch) \
	(((ch) == 1) ? 4 : 0)

/* Parameter offsets */
#define SI1145_PARAM_CHLIST		0x01
#define SI1145_PARAM_PSLED12_SELECT	0x02
#define SI1145_PARAM_PSLED3_SELECT	0x03
#define SI1145_PARAM_PS_ENCODING	0x05
#define SI1145_PARAM_ALS_ENCODING	0x06
#define SI1145_PARAM_PS1_ADC_MUX	0x07
#define SI1145_PARAM_PS2_ADC_MUX	0x08
#define SI1145_PARAM_PS3_ADC_MUX	0x09
#define SI1145_PARAM_PS_ADC_COUNTER	0x0a
#define SI1145_PARAM_PS_ADC_GAIN	0x0b
#define SI1145_PARAM_PS_ADC_MISC	0x0c
#define SI1145_PARAM_ALS_ADC_MUX	0x0d
#define SI1145_PARAM_ALSIR_ADC_MUX	0x0e
#define SI1145_PARAM_AUX_ADC_MUX	0x0f
#define SI1145_PARAM_ALSVIS_ADC_COUNTER	0x10
#define SI1145_PARAM_ALSVIS_ADC_GAIN	0x11
#define SI1145_PARAM_ALSVIS_ADC_MISC	0x12
#define SI1145_PARAM_LED_RECOVERY	0x1c
#define SI1145_PARAM_ALSIR_ADC_COUNTER	0x1d
#define SI1145_PARAM_ALSIR_ADC_GAIN	0x1e
#define SI1145_PARAM_ALSIR_ADC_MISC	0x1f
#define SI1145_PARAM_ADC_OFFSET		0x1a

/* Channel enable masks for CHLIST parameter */
#define SI1145_CHLIST_EN_PS1		BIT(0)
#define SI1145_CHLIST_EN_PS2		BIT(1)
#define SI1145_CHLIST_EN_PS3		BIT(2)
#define SI1145_CHLIST_EN_ALSVIS		BIT(4)
#define SI1145_CHLIST_EN_ALSIR		BIT(5)
#define SI1145_CHLIST_EN_AUX		BIT(6)
#define SI1145_CHLIST_EN_UV		BIT(7)

/* Proximity measurement mode for ADC_MISC parameter */
#define SI1145_PS_ADC_MODE_NORMAL	BIT(2)
/* Signal range mask for ADC_MISC parameter */
#define SI1145_ADC_MISC_RANGE		BIT(5)

/* Commands for REG_COMMAND */
#define SI1145_CMD_NOP			0x00
#define SI1145_CMD_RESET		0x01
#define SI1145_CMD_PS_FORCE		0x05
#define SI1145_CMD_ALS_FORCE		0x06
#define SI1145_CMD_PSALS_FORCE		0x07
#define SI1145_CMD_PS_PAUSE		0x09
#define SI1145_CMD_ALS_PAUSE		0x0a
#define SI1145_CMD_PSALS_PAUSE		0x0b
#define SI1145_CMD_PS_AUTO		0x0d
#define SI1145_CMD_ALS_AUTO		0x0e
#define SI1145_CMD_PSALS_AUTO		0x0f
#define SI1145_CMD_PARAM_QUERY		0x80
#define SI1145_CMD_PARAM_SET		0xa0

#define SI1145_RSP_INVALID_SETTING	0x80
#define SI1145_RSP_COUNTER_MASK		0x0F

/* Minimum sleep after each command to ensure it's received */
#define SI1145_COMMAND_MINSLEEP_MS	5
/* Return -ETIMEDOUT after this long */
#define SI1145_COMMAND_TIMEOUT_MS	25

/* Interrupt configuration masks for INT_CFG register */
#define SI1145_INT_CFG_OE		BIT(0) /* enable interrupt */
#define SI1145_INT_CFG_MODE		BIT(1) /* auto reset interrupt pin */

/* Interrupt enable masks for IRQ_ENABLE register */
#define SI1145_MASK_ALL_IE		(BIT(4) | BIT(3) | BIT(2) | BIT(0))

#define SI1145_MUX_TEMP			0x65
#define SI1145_MUX_VDD			0x75

/* Proximity LED current; see Table 2 in datasheet */
#define SI1145_LED_CURRENT_45mA		0x04

enum {
	SI1132,
	SI1141,
	SI1142,
	SI1143,
	SI1145,
	SI1146,
	SI1147,
};

struct si1145_part_info {
	u8 part;
	const struct iio_info *iio_info;
	const struct iio_chan_spec *channels;
	unsigned int num_channels;
	unsigned int num_leds;
	bool uncompressed_meas_rate;
};

/**
 * struct si1145_data - si1145 chip state data
 * @client:	I2C client
 * @lock:	mutex to protect shared state.
 * @cmdlock:	Low-level mutex to protect command execution only
 * @rsp_seq:	Next expected response number or -1 if counter reset required
 * @scan_mask:	Saved scan mask to avoid duplicate set_chlist
 * @autonomous: If automatic measurements are active (for buffer support)
 * @part_info:	Part information
 * @trig:	Pointer to iio trigger
 * @meas_rate:	Value of MEAS_RATE register. Only set in HW in auto mode
 */
struct si1145_data {
	struct i2c_client *client;
	struct mutex lock;
	struct mutex cmdlock;
	int rsp_seq;
	const struct si1145_part_info *part_info;
	unsigned long scan_mask;
	bool autonomous;
	struct iio_trigger *trig;
	int meas_rate;
};

/**
 * __si1145_command_reset() - Send CMD_NOP and wait for response 0
 *
 * Does not modify data->rsp_seq
 *
 * Return: 0 on success and -errno on error.
 */
static int __si1145_command_reset(struct si1145_data *data)
{
	struct device *dev = &data->client->dev;
	unsigned long stop_jiffies;
	int ret;

	ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND,
						      SI1145_CMD_NOP);
	if (ret < 0)
		return ret;
	msleep(SI1145_COMMAND_MINSLEEP_MS);

	stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
	while (true) {
		ret = i2c_smbus_read_byte_data(data->client,
					       SI1145_REG_RESPONSE);
		if (ret <= 0)
			return ret;
		if (time_after(jiffies, stop_jiffies)) {
			dev_warn(dev, "timeout on reset\n");
			return -ETIMEDOUT;
		}
		msleep(SI1145_COMMAND_MINSLEEP_MS);
		continue;
	}
}

/**
 * si1145_command() - Execute a command and poll the response register
 *
 * All conversion overflows are reported as -EOVERFLOW
 * INVALID_SETTING is reported as -EINVAL
 * Timeouts are reported as -ETIMEDOUT
 *
 * Return: 0 on success or -errno on failure
 */
static int si1145_command(struct si1145_data *data, u8 cmd)
{
	struct device *dev = &data->client->dev;
	unsigned long stop_jiffies;
	int ret;

	mutex_lock(&data->cmdlock);

	if (data->rsp_seq < 0) {
		ret = __si1145_command_reset(data);
		if (ret < 0) {
			dev_err(dev, "failed to reset command counter, ret=%d\n",
				ret);
			goto out;
		}
		data->rsp_seq = 0;
	}

	ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd);
	if (ret) {
		dev_warn(dev, "failed to write command, ret=%d\n", ret);
		goto out;
	}
	/* Sleep a little to ensure the command is received */
	msleep(SI1145_COMMAND_MINSLEEP_MS);

	stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000;
	while (true) {
		ret = i2c_smbus_read_byte_data(data->client,
					       SI1145_REG_RESPONSE);
		if (ret < 0) {
			dev_warn(dev, "failed to read response, ret=%d\n", ret);
			break;
		}

		if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) {
			if (ret == data->rsp_seq) {
				if (time_after(jiffies, stop_jiffies)) {
					dev_warn(dev, "timeout on command %#02hhx\n",
						 cmd);
					ret = -ETIMEDOUT;
					break;
				}
				msleep(SI1145_COMMAND_MINSLEEP_MS);
				continue;
			}
			if (ret == ((data->rsp_seq + 1) &
				SI1145_RSP_COUNTER_MASK)) {
				data->rsp_seq = ret;
				ret = 0;
				break;
			}
			dev_warn(dev, "unexpected response counter %d instead of %d\n",
				 ret, (data->rsp_seq + 1) &
					SI1145_RSP_COUNTER_MASK);
			ret = -EIO;
		} else {
			if (ret == SI1145_RSP_INVALID_SETTING) {
				dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n",
					 cmd);
				ret = -EINVAL;
			} else {
				/* All overflows are treated identically */
				dev_dbg(dev, "overflow, ret=%d, cmd=%#02hhx\n",
					ret, cmd);
				ret = -EOVERFLOW;
			}
		}

		/* Force a counter reset next time */
		data->rsp_seq = -1;
		break;
	}

out:
	mutex_unlock(&data->cmdlock);

	return ret;
}

static int si1145_param_update(struct si1145_data *data, u8 op, u8 param,
			       u8 value)
{
	int ret;

	ret = i2c_smbus_write_byte_data(data->client,
		SI1145_REG_PARAM_WR, value);
	if (ret < 0)
		return ret;

	return si1145_command(data, op | (param & 0x1F));
}

static int si1145_param_set(struct si1145_data *data, u8 param, u8 value)
{
	return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value);
}

/* Set param. Returns negative errno or current value */
static int si1145_param_query(struct si1145_data *data, u8 param)
{
	int ret;

	ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F));
	if (ret < 0)
		return ret;

	return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD);
}

/* Expand 8 bit compressed value to 16 bit, see Silabs AN498 */
static u16 si1145_uncompress(u8 x)
{
	u16 result = 0;
	u8 exponent = 0;

	if (x < 8)
		return 0;

	exponent = (x & 0xf0) >> 4;
	result = 0x10 | (x & 0x0f);

	if (exponent >= 4)
		return result << (exponent - 4);
	return result >> (4 - exponent);
}

/* Compress 16 bit value to 8 bit, see Silabs AN498 */
static u8 si1145_compress(u16 x)
{
	u32 exponent = 0;
	u32 significand = 0;
	u32 tmp = x;

	if (x == 0x0000)
		return 0x00;
	if (x == 0x0001)
		return 0x08;

	while (1) {
		tmp >>= 1;
		exponent += 1;
		if (tmp == 1)
			break;
	}

	if (exponent < 5) {
		significand = x << (4 - exponent);
		return (exponent << 4) | (significand & 0xF);
	}

	significand = x >> (exponent - 5);
	if (significand & 1) {
		significand += 2;
		if (significand & 0x0040) {
			exponent += 1;
			significand >>= 1;
		}
	}

	return (exponent << 4) | ((significand >> 1) & 0xF);
}

/* Write meas_rate in hardware */
static int si1145_set_meas_rate(struct si1145_data *data, int interval)
{
	if (data->part_info->uncompressed_meas_rate)
		return i2c_smbus_write_word_data(data->client,
			SI1145_REG_MEAS_RATE, interval);
	else
		return i2c_smbus_write_byte_data(data->client,
			SI1145_REG_MEAS_RATE, interval);
}

static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2)
{
	*val = 32000;
	if (data->part_info->uncompressed_meas_rate)
		*val2 = data->meas_rate;
	else
		*val2 = si1145_uncompress(data->meas_rate);
	return IIO_VAL_FRACTIONAL;
}

/* Set the samp freq in driver private data */
static int si1145_store_samp_freq(struct si1145_data *data, int val)
{
	int ret = 0;
	int meas_rate;

	if (val <= 0 || val > 32000)
		return -ERANGE;
	meas_rate = 32000 / val;

	mutex_lock(&data->lock);
	if (data->autonomous) {
		ret = si1145_set_meas_rate(data, meas_rate);
		if (ret)
			goto out;
	}
	if (data->part_info->uncompressed_meas_rate)
		data->meas_rate = meas_rate;
	else
		data->meas_rate = si1145_compress(meas_rate);

out:
	mutex_unlock(&data->lock);

	return ret;
}

static irqreturn_t si1145_trigger_handler(int irq, void *private)
{
	struct iio_poll_func *pf = private;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct si1145_data *data = iio_priv(indio_dev);
	/*
	 * Maximum buffer size:
	 *   6*2 bytes channels data + 4 bytes alignment +
	 *   8 bytes timestamp
	 */
	u8 buffer[24];
	int i, j = 0;
	int ret;
	u8 irq_status = 0;

	if (!data->autonomous) {
		ret = si1145_command(data, SI1145_CMD_PSALS_FORCE);
		if (ret < 0 && ret != -EOVERFLOW)
			goto done;
	} else {
		irq_status = ret = i2c_smbus_read_byte_data(data->client,
				SI1145_REG_IRQ_STATUS);
		if (ret < 0)
			goto done;
		if (!(irq_status & SI1145_MASK_ALL_IE))
			goto done;
	}

	for_each_set_bit(i, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		int run = 1;

		while (i + run < indio_dev->masklength) {
			if (!test_bit(i + run, indio_dev->active_scan_mask))
				break;
			if (indio_dev->channels[i + run].address !=
				indio_dev->channels[i].address + 2 * run)
				break;
			run++;
		}

		ret = i2c_smbus_read_i2c_block_data_or_emulated(
				data->client, indio_dev->channels[i].address,
				sizeof(u16) * run, &buffer[j]);
		if (ret < 0)
			goto done;
		j += run * sizeof(u16);
		i += run - 1;
	}

	if (data->autonomous) {
		ret = i2c_smbus_write_byte_data(data->client,
				SI1145_REG_IRQ_STATUS,
				irq_status & SI1145_MASK_ALL_IE);
		if (ret < 0)
			goto done;
	}

	iio_push_to_buffers_with_timestamp(indio_dev, buffer,
		iio_get_time_ns(indio_dev));

done:
	iio_trigger_notify_done(indio_dev->trig);
	return IRQ_HANDLED;
}

static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask)
{
	struct si1145_data *data = iio_priv(indio_dev);
	u8 reg = 0, mux;
	int ret;
	int i;

	/* channel list already set, no need to reprogram */
	if (data->scan_mask == scan_mask)
		return 0;

	for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
		switch (indio_dev->channels[i].address) {
		case SI1145_REG_ALSVIS_DATA:
			reg |= SI1145_CHLIST_EN_ALSVIS;
			break;
		case SI1145_REG_ALSIR_DATA:
			reg |= SI1145_CHLIST_EN_ALSIR;
			break;
		case SI1145_REG_PS1_DATA:
			reg |= SI1145_CHLIST_EN_PS1;
			break;
		case SI1145_REG_PS2_DATA:
			reg |= SI1145_CHLIST_EN_PS2;
			break;
		case SI1145_REG_PS3_DATA:
			reg |= SI1145_CHLIST_EN_PS3;
			break;
		case SI1145_REG_AUX_DATA:
			switch (indio_dev->channels[i].type) {
			case IIO_UVINDEX:
				reg |= SI1145_CHLIST_EN_UV;
				break;
			default:
				reg |= SI1145_CHLIST_EN_AUX;
				if (indio_dev->channels[i].type == IIO_TEMP)
					mux = SI1145_MUX_TEMP;
				else
					mux = SI1145_MUX_VDD;
				ret = si1145_param_set(data,
					SI1145_PARAM_AUX_ADC_MUX, mux);
				if (ret < 0)
					return ret;

				break;
			}
		}
	}

	data->scan_mask = scan_mask;
	ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg);

	return ret < 0 ? ret : 0;
}

static int si1145_measure(struct iio_dev *indio_dev,
			  struct iio_chan_spec const *chan)
{
	struct si1145_data *data = iio_priv(indio_dev);
	u8 cmd;
	int ret;

	ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index));
	if (ret < 0)
		return ret;

	cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE :
		SI1145_CMD_ALS_FORCE;
	ret = si1145_command(data, cmd);
	if (ret < 0 && ret != -EOVERFLOW)
		return ret;

	return i2c_smbus_read_word_data(data->client, chan->address);
}

/*
 * Conversion between iio scale and ADC_GAIN values
 * These could be further adjusted but proximity/intensity are dimensionless
 */
static const int si1145_proximity_scale_available[] = {
	128, 64, 32, 16, 8, 4};
static const int si1145_intensity_scale_available[] = {
	128, 64, 32, 16, 8, 4, 2, 1};
static IIO_CONST_ATTR(in_proximity_scale_available,
	"128 64 32 16 8 4");
static IIO_CONST_ATTR(in_intensity_scale_available,
	"128 64 32 16 8 4 2 1");
static IIO_CONST_ATTR(in_intensity_ir_scale_available,
	"128 64 32 16 8 4 2 1");

static int si1145_scale_from_adcgain(int regval)
{
	return 128 >> regval;
}

static int si1145_proximity_adcgain_from_scale(int val, int val2)
{
	val = find_closest_descending(val, si1145_proximity_scale_available,
				ARRAY_SIZE(si1145_proximity_scale_available));
	if (val < 0 || val > 5 || val2 != 0)
		return -EINVAL;

	return val;
}

static int si1145_intensity_adcgain_from_scale(int val, int val2)
{
	val = find_closest_descending(val, si1145_intensity_scale_available,
				ARRAY_SIZE(si1145_intensity_scale_available));
	if (val < 0 || val > 7 || val2 != 0)
		return -EINVAL;

	return val;
}

static int si1145_read_raw(struct iio_dev *indio_dev,
				struct iio_chan_spec const *chan,
				int *val, int *val2, long mask)
{
	struct si1145_data *data = iio_priv(indio_dev);
	int ret;
	u8 reg;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		switch (chan->type) {
		case IIO_INTENSITY:
		case IIO_PROXIMITY:
		case IIO_VOLTAGE:
		case IIO_TEMP:
		case IIO_UVINDEX:
			ret = iio_device_claim_direct_mode(indio_dev);
			if (ret)
				return ret;
			ret = si1145_measure(indio_dev, chan);
			iio_device_release_direct_mode(indio_dev);

			if (ret < 0)
				return ret;

			*val = ret;

			return IIO_VAL_INT;
		case IIO_CURRENT:
			ret = i2c_smbus_read_byte_data(data->client,
				SI1145_PS_LED_REG(chan->channel));
			if (ret < 0)
				return ret;

			*val = (ret >> SI1145_PS_LED_SHIFT(chan->channel))
				& 0x0f;

			return IIO_VAL_INT;
		default:
			return -EINVAL;
		}
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_PROXIMITY:
			reg = SI1145_PARAM_PS_ADC_GAIN;
			break;
		case IIO_INTENSITY:
			if (chan->channel2 == IIO_MOD_LIGHT_IR)
				reg = SI1145_PARAM_ALSIR_ADC_GAIN;
			else
				reg = SI1145_PARAM_ALSVIS_ADC_GAIN;
			break;
		case IIO_TEMP:
			*val = 28;
			*val2 = 571429;
			return IIO_VAL_INT_PLUS_MICRO;
		case IIO_UVINDEX:
			*val = 0;
			*val2 = 10000;
			return IIO_VAL_INT_PLUS_MICRO;
		default:
			return -EINVAL;
		}

		ret = si1145_param_query(data, reg);
		if (ret < 0)
			return ret;

		*val = si1145_scale_from_adcgain(ret & 0x07);

		return IIO_VAL_INT;
	case IIO_CHAN_INFO_OFFSET:
		switch (chan->type) {
		case IIO_TEMP:
			/*
			 * -ADC offset - ADC counts @ 25°C -
			 *   35 * ADC counts / °C
			 */
			*val = -256 - 11136 + 25 * 35;
			return IIO_VAL_INT;
		default:
			/*
			 * All ADC measurements have are by default offset
			 * by -256
			 * See AN498 5.6.3
			 */
			ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET);
			if (ret < 0)
				return ret;
			*val = -si1145_uncompress(ret);
			return IIO_VAL_INT;
		}
	case IIO_CHAN_INFO_SAMP_FREQ:
		return si1145_read_samp_freq(data, val, val2);
	default:
		return -EINVAL;
	}
}

static int si1145_write_raw(struct iio_dev *indio_dev,
			       struct iio_chan_spec const *chan,
			       int val, int val2, long mask)
{
	struct si1145_data *data = iio_priv(indio_dev);
	u8 reg1, reg2, shift;
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_PROXIMITY:
			val = si1145_proximity_adcgain_from_scale(val, val2);
			if (val < 0)
				return val;
			reg1 = SI1145_PARAM_PS_ADC_GAIN;
			reg2 = SI1145_PARAM_PS_ADC_COUNTER;
			break;
		case IIO_INTENSITY:
			val = si1145_intensity_adcgain_from_scale(val, val2);
			if (val < 0)
				return val;
			if (chan->channel2 == IIO_MOD_LIGHT_IR) {
				reg1 = SI1145_PARAM_ALSIR_ADC_GAIN;
				reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER;
			} else {
				reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN;
				reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER;
			}
			break;
		default:
			return -EINVAL;
		}

		ret = iio_device_claim_direct_mode(indio_dev);
		if (ret)
			return ret;

		ret = si1145_param_set(data, reg1, val);
		if (ret < 0) {
			iio_device_release_direct_mode(indio_dev);
			return ret;
		}
		/* Set recovery period to one's complement of gain */
		ret = si1145_param_set(data, reg2, (~val & 0x07) << 4);
		iio_device_release_direct_mode(indio_dev);
		return ret;
	case IIO_CHAN_INFO_RAW:
		if (chan->type != IIO_CURRENT)
			return -EINVAL;

		if (val < 0 || val > 15 || val2 != 0)
			return -EINVAL;

		reg1 = SI1145_PS_LED_REG(chan->channel);
		shift = SI1145_PS_LED_SHIFT(chan->channel);

		ret = iio_device_claim_direct_mode(indio_dev);
		if (ret)
			return ret;

		ret = i2c_smbus_read_byte_data(data->client, reg1);
		if (ret < 0) {
			iio_device_release_direct_mode(indio_dev);
			return ret;
		}
		ret = i2c_smbus_write_byte_data(data->client, reg1,
			(ret & ~(0x0f << shift)) |
			((val & 0x0f) << shift));
		iio_device_release_direct_mode(indio_dev);
		return ret;
	case IIO_CHAN_INFO_SAMP_FREQ:
		return si1145_store_samp_freq(data, val);
	default:
		return -EINVAL;
	}
}

#define SI1145_ST { \
	.sign = 'u', \
	.realbits = 16, \
	.storagebits = 16, \
	.endianness = IIO_LE, \
}

#define SI1145_INTENSITY_CHANNEL(_si) { \
	.type = IIO_INTENSITY, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
			      BIT(IIO_CHAN_INFO_OFFSET) | \
			      BIT(IIO_CHAN_INFO_SCALE), \
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	.scan_type = SI1145_ST, \
	.scan_index = _si, \
	.address = SI1145_REG_ALSVIS_DATA, \
}

#define SI1145_INTENSITY_IR_CHANNEL(_si) { \
	.type = IIO_INTENSITY, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
			      BIT(IIO_CHAN_INFO_OFFSET) | \
			      BIT(IIO_CHAN_INFO_SCALE), \
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	.modified = 1, \
	.channel2 = IIO_MOD_LIGHT_IR, \
	.scan_type = SI1145_ST, \
	.scan_index = _si, \
	.address = SI1145_REG_ALSIR_DATA, \
}

#define SI1145_TEMP_CHANNEL(_si) { \
	.type = IIO_TEMP, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
			      BIT(IIO_CHAN_INFO_OFFSET) | \
			      BIT(IIO_CHAN_INFO_SCALE), \
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	.scan_type = SI1145_ST, \
	.scan_index = _si, \
	.address = SI1145_REG_AUX_DATA, \
}

#define SI1145_UV_CHANNEL(_si) { \
	.type = IIO_UVINDEX, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
			      BIT(IIO_CHAN_INFO_SCALE), \
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	.scan_type = SI1145_ST, \
	.scan_index = _si, \
	.address = SI1145_REG_AUX_DATA, \
}

#define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \
	.type = IIO_PROXIMITY, \
	.indexed = 1, \
	.channel = _ch, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
				    BIT(IIO_CHAN_INFO_OFFSET), \
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	.scan_type = SI1145_ST, \
	.scan_index = _si, \
	.address = SI1145_REG_PS1_DATA + _ch * 2, \
}

#define SI1145_VOLTAGE_CHANNEL(_si) { \
	.type = IIO_VOLTAGE, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
	.scan_type = SI1145_ST, \
	.scan_index = _si, \
	.address = SI1145_REG_AUX_DATA, \
}

#define SI1145_CURRENT_CHANNEL(_ch) { \
	.type = IIO_CURRENT, \
	.indexed = 1, \
	.channel = _ch, \
	.output = 1, \
	.scan_index = -1, \
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
}

static const struct iio_chan_spec si1132_channels[] = {
	SI1145_INTENSITY_CHANNEL(0),
	SI1145_INTENSITY_IR_CHANNEL(1),
	SI1145_TEMP_CHANNEL(2),
	SI1145_VOLTAGE_CHANNEL(3),
	SI1145_UV_CHANNEL(4),
	IIO_CHAN_SOFT_TIMESTAMP(6),
};

static const struct iio_chan_spec si1141_channels[] = {
	SI1145_INTENSITY_CHANNEL(0),
	SI1145_INTENSITY_IR_CHANNEL(1),
	SI1145_PROXIMITY_CHANNEL(2, 0),
	SI1145_TEMP_CHANNEL(3),
	SI1145_VOLTAGE_CHANNEL(4),
	IIO_CHAN_SOFT_TIMESTAMP(5),
	SI1145_CURRENT_CHANNEL(0),
};

static const struct iio_chan_spec si1142_channels[] = {
	SI1145_INTENSITY_CHANNEL(0),
	SI1145_INTENSITY_IR_CHANNEL(1),
	SI1145_PROXIMITY_CHANNEL(2, 0),
	SI1145_PROXIMITY_CHANNEL(3, 1),
	SI1145_TEMP_CHANNEL(4),
	SI1145_VOLTAGE_CHANNEL(5),
	IIO_CHAN_SOFT_TIMESTAMP(6),
	SI1145_CURRENT_CHANNEL(0),
	SI1145_CURRENT_CHANNEL(1),
};

static const struct iio_chan_spec si1143_channels[] = {
	SI1145_INTENSITY_CHANNEL(0),
	SI1145_INTENSITY_IR_CHANNEL(1),
	SI1145_PROXIMITY_CHANNEL(2, 0),
	SI1145_PROXIMITY_CHANNEL(3, 1),
	SI1145_PROXIMITY_CHANNEL(4, 2),
	SI1145_TEMP_CHANNEL(5),
	SI1145_VOLTAGE_CHANNEL(6),
	IIO_CHAN_SOFT_TIMESTAMP(7),
	SI1145_CURRENT_CHANNEL(0),
	SI1145_CURRENT_CHANNEL(1),
	SI1145_CURRENT_CHANNEL(2),
};

static const struct iio_chan_spec si1145_channels[] = {
	SI1145_INTENSITY_CHANNEL(0),
	SI1145_INTENSITY_IR_CHANNEL(1),
	SI1145_PROXIMITY_CHANNEL(2, 0),
	SI1145_TEMP_CHANNEL(3),
	SI1145_VOLTAGE_CHANNEL(4),
	SI1145_UV_CHANNEL(5),
	IIO_CHAN_SOFT_TIMESTAMP(6),
	SI1145_CURRENT_CHANNEL(0),
};

static const struct iio_chan_spec si1146_channels[] = {
	SI1145_INTENSITY_CHANNEL(0),
	SI1145_INTENSITY_IR_CHANNEL(1),
	SI1145_TEMP_CHANNEL(2),
	SI1145_VOLTAGE_CHANNEL(3),
	SI1145_UV_CHANNEL(4),
	SI1145_PROXIMITY_CHANNEL(5, 0),
	SI1145_PROXIMITY_CHANNEL(6, 1),
	IIO_CHAN_SOFT_TIMESTAMP(7),
	SI1145_CURRENT_CHANNEL(0),
	SI1145_CURRENT_CHANNEL(1),
};

static const struct iio_chan_spec si1147_channels[] = {
	SI1145_INTENSITY_CHANNEL(0),
	SI1145_INTENSITY_IR_CHANNEL(1),
	SI1145_PROXIMITY_CHANNEL(2, 0),
	SI1145_PROXIMITY_CHANNEL(3, 1),
	SI1145_PROXIMITY_CHANNEL(4, 2),
	SI1145_TEMP_CHANNEL(5),
	SI1145_VOLTAGE_CHANNEL(6),
	SI1145_UV_CHANNEL(7),
	IIO_CHAN_SOFT_TIMESTAMP(8),
	SI1145_CURRENT_CHANNEL(0),
	SI1145_CURRENT_CHANNEL(1),
	SI1145_CURRENT_CHANNEL(2),
};

static struct attribute *si1132_attributes[] = {
	&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
	&iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
	NULL,
};

static struct attribute *si114x_attributes[] = {
	&iio_const_attr_in_intensity_scale_available.dev_attr.attr,
	&iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr,
	&iio_const_attr_in_proximity_scale_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group si1132_attribute_group = {
	.attrs = si1132_attributes,
};

static const struct attribute_group si114x_attribute_group = {
	.attrs = si114x_attributes,
};


static const struct iio_info si1132_info = {
	.read_raw = si1145_read_raw,
	.write_raw = si1145_write_raw,
	.attrs = &si1132_attribute_group,
};

static const struct iio_info si114x_info = {
	.read_raw = si1145_read_raw,
	.write_raw = si1145_write_raw,
	.attrs = &si114x_attribute_group,
};

#define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \
	{id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate}

static const struct si1145_part_info si1145_part_info[] = {
	[SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true),
	[SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false),
	[SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false),
	[SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false),
	[SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true),
	[SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true),
	[SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true),
};

static int si1145_initialize(struct si1145_data *data)
{
	struct i2c_client *client = data->client;
	int ret;

	ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND,
					SI1145_CMD_RESET);
	if (ret < 0)
		return ret;
	msleep(SI1145_COMMAND_TIMEOUT_MS);

	/* Hardware key, magic value */
	ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17);
	if (ret < 0)
		return ret;
	msleep(SI1145_COMMAND_TIMEOUT_MS);

	/* Turn off autonomous mode */
	ret = si1145_set_meas_rate(data, 0);
	if (ret < 0)
		return ret;

	/* Initialize sampling freq to 10 Hz */
	ret = si1145_store_samp_freq(data, 10);
	if (ret < 0)
		return ret;

	/* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */
	switch (data->part_info->num_leds) {
	case 3:
		ret = i2c_smbus_write_byte_data(client,
						SI1145_REG_PS_LED3,
						SI1145_LED_CURRENT_45mA);
		if (ret < 0)
			return ret;
		/* fallthrough */
	case 2:
		ret = i2c_smbus_write_byte_data(client,
						SI1145_REG_PS_LED21,
						(SI1145_LED_CURRENT_45mA << 4) |
						SI1145_LED_CURRENT_45mA);
		break;
	case 1:
		ret = i2c_smbus_write_byte_data(client,
						SI1145_REG_PS_LED21,
						SI1145_LED_CURRENT_45mA);
		break;
	default:
		ret = 0;
		break;
	}
	if (ret < 0)
		return ret;

	/* Set normal proximity measurement mode */
	ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC,
			       SI1145_PS_ADC_MODE_NORMAL);
	if (ret < 0)
		return ret;

	ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01);
	if (ret < 0)
		return ret;

	/* ADC_COUNTER should be one complement of ADC_GAIN */
	ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 4);
	if (ret < 0)
		return ret;

	/* Set ALS visible measurement mode */
	ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC,
			       SI1145_ADC_MISC_RANGE);
	if (ret < 0)
		return ret;

	ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03);
	if (ret < 0)
		return ret;

	ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER,
			       0x04 << 4);
	if (ret < 0)
		return ret;

	/* Set ALS IR measurement mode */
	ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC,
			       SI1145_ADC_MISC_RANGE);
	if (ret < 0)
		return ret;

	ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01);
	if (ret < 0)
		return ret;

	ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER,
			       0x06 << 4);
	if (ret < 0)
		return ret;

	/*
	 * Initialize UCOEF to default values in datasheet
	 * These registers are normally zero on reset
	 */
	if (data->part_info == &si1145_part_info[SI1132] ||
		data->part_info == &si1145_part_info[SI1145] ||
		data->part_info == &si1145_part_info[SI1146] ||
		data->part_info == &si1145_part_info[SI1147]) {
		ret = i2c_smbus_write_byte_data(data->client,
						SI1145_REG_UCOEF1,
						SI1145_UCOEF1_DEFAULT);
		if (ret < 0)
			return ret;
		ret = i2c_smbus_write_byte_data(data->client,
				SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT);
		if (ret < 0)
			return ret;
		ret = i2c_smbus_write_byte_data(data->client,
				SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT);
		if (ret < 0)
			return ret;
		ret = i2c_smbus_write_byte_data(data->client,
				SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT);
		if (ret < 0)
			return ret;
	}

	return 0;
}

/*
 * Program the channels we want to measure with CMD_PSALS_AUTO. No need for
 * _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct)
 * mode reprograms the channels list anyway...
 */
static int si1145_buffer_preenable(struct iio_dev *indio_dev)
{
	struct si1145_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->lock);
	ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask);
	mutex_unlock(&data->lock);

	return ret;
}

static bool si1145_validate_scan_mask(struct iio_dev *indio_dev,
			       const unsigned long *scan_mask)
{
	struct si1145_data *data = iio_priv(indio_dev);
	unsigned int count = 0;
	int i;

	/* Check that at most one AUX channel is enabled */
	for_each_set_bit(i, scan_mask, data->part_info->num_channels) {
		if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA)
			count++;
	}

	return count <= 1;
}

static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = {
	.preenable = si1145_buffer_preenable,
	.postenable = iio_triggered_buffer_postenable,
	.predisable = iio_triggered_buffer_predisable,
	.validate_scan_mask = si1145_validate_scan_mask,
};

/**
 * si1145_trigger_set_state() - Set trigger state
 *
 * When not using triggers interrupts are disabled and measurement rate is
 * set to zero in order to minimize power consumption.
 */
static int si1145_trigger_set_state(struct iio_trigger *trig, bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct si1145_data *data = iio_priv(indio_dev);
	int err = 0, ret;

	mutex_lock(&data->lock);

	if (state) {
		data->autonomous = true;
		err = i2c_smbus_write_byte_data(data->client,
				SI1145_REG_INT_CFG, SI1145_INT_CFG_OE);
		if (err < 0)
			goto disable;
		err = i2c_smbus_write_byte_data(data->client,
				SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE);
		if (err < 0)
			goto disable;
		err = si1145_set_meas_rate(data, data->meas_rate);
		if (err < 0)
			goto disable;
		err = si1145_command(data, SI1145_CMD_PSALS_AUTO);
		if (err < 0)
			goto disable;
	} else {
disable:
		/* Disable as much as possible skipping errors */
		ret = si1145_command(data, SI1145_CMD_PSALS_PAUSE);
		if (ret < 0 && !err)
			err = ret;
		ret = si1145_set_meas_rate(data, 0);
		if (ret < 0 && !err)
			err = ret;
		ret = i2c_smbus_write_byte_data(data->client,
						SI1145_REG_IRQ_ENABLE, 0);
		if (ret < 0 && !err)
			err = ret;
		ret = i2c_smbus_write_byte_data(data->client,
						SI1145_REG_INT_CFG, 0);
		if (ret < 0 && !err)
			err = ret;
		data->autonomous = false;
	}

	mutex_unlock(&data->lock);
	return err;
}

static const struct iio_trigger_ops si1145_trigger_ops = {
	.set_trigger_state = si1145_trigger_set_state,
};

static int si1145_probe_trigger(struct iio_dev *indio_dev)
{
	struct si1145_data *data = iio_priv(indio_dev);
	struct i2c_client *client = data->client;
	struct iio_trigger *trig;
	int ret;

	trig = devm_iio_trigger_alloc(&client->dev,
			"%s-dev%d", indio_dev->name, indio_dev->id);
	if (!trig)
		return -ENOMEM;

	trig->dev.parent = &client->dev;
	trig->ops = &si1145_trigger_ops;
	iio_trigger_set_drvdata(trig, indio_dev);

	ret = devm_request_irq(&client->dev, client->irq,
			  iio_trigger_generic_data_rdy_poll,
			  IRQF_TRIGGER_FALLING,
			  "si1145_irq",
			  trig);
	if (ret < 0) {
		dev_err(&client->dev, "irq request failed\n");
		return ret;
	}

	ret = iio_trigger_register(trig);
	if (ret)
		return ret;

	data->trig = trig;
	indio_dev->trig = iio_trigger_get(data->trig);

	return 0;
}

static void si1145_remove_trigger(struct iio_dev *indio_dev)
{
	struct si1145_data *data = iio_priv(indio_dev);

	if (data->trig) {
		iio_trigger_unregister(data->trig);
		data->trig = NULL;
	}
}

static int si1145_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct si1145_data *data;
	struct iio_dev *indio_dev;
	u8 part_id, rev_id, seq_id;
	int ret;

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

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;
	data->part_info = &si1145_part_info[id->driver_data];

	part_id = ret = i2c_smbus_read_byte_data(data->client,
						 SI1145_REG_PART_ID);
	if (ret < 0)
		return ret;
	rev_id = ret = i2c_smbus_read_byte_data(data->client,
						SI1145_REG_REV_ID);
	if (ret < 0)
		return ret;
	seq_id = ret = i2c_smbus_read_byte_data(data->client,
						SI1145_REG_SEQ_ID);
	if (ret < 0)
		return ret;
	dev_info(&client->dev, "device ID part %#02hhx rev %#02hhx seq %#02hhx\n",
			part_id, rev_id, seq_id);
	if (part_id != data->part_info->part) {
		dev_err(&client->dev, "part ID mismatch got %#02hhx, expected %#02x\n",
				part_id, data->part_info->part);
		return -ENODEV;
	}

	indio_dev->dev.parent = &client->dev;
	indio_dev->name = id->name;
	indio_dev->channels = data->part_info->channels;
	indio_dev->num_channels = data->part_info->num_channels;
	indio_dev->info = data->part_info->iio_info;
	indio_dev->modes = INDIO_DIRECT_MODE;

	mutex_init(&data->lock);
	mutex_init(&data->cmdlock);

	ret = si1145_initialize(data);
	if (ret < 0)
		return ret;

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
		si1145_trigger_handler, &si1145_buffer_setup_ops);
	if (ret < 0)
		return ret;

	if (client->irq) {
		ret = si1145_probe_trigger(indio_dev);
		if (ret < 0)
			goto error_free_buffer;
	} else {
		dev_info(&client->dev, "no irq, using polling\n");
	}

	ret = iio_device_register(indio_dev);
	if (ret < 0)
		goto error_free_trigger;

	return 0;

error_free_trigger:
	si1145_remove_trigger(indio_dev);
error_free_buffer:
	iio_triggered_buffer_cleanup(indio_dev);

	return ret;
}

static const struct i2c_device_id si1145_ids[] = {
	{ "si1132", SI1132 },
	{ "si1141", SI1141 },
	{ "si1142", SI1142 },
	{ "si1143", SI1143 },
	{ "si1145", SI1145 },
	{ "si1146", SI1146 },
	{ "si1147", SI1147 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, si1145_ids);

static int si1145_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	si1145_remove_trigger(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);

	return 0;
}

static struct i2c_driver si1145_driver = {
	.driver = {
		.name   = "si1145",
	},
	.probe  = si1145_probe,
	.remove = si1145_remove,
	.id_table = si1145_ids,
};

module_i2c_driver(si1145_driver);

MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver");
MODULE_LICENSE("GPL");