summaryrefslogtreecommitdiffstats
path: root/drivers/iio/light/gp2ap020a00f.c
blob: 5ea4a03c7e71b465926a298ef3cfbebb61113c99 (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
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
/*
 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
 * Author: Jacek Anaszewski <j.anaszewski@samsung.com>
 *
 * IIO features supported by the driver:
 *
 * Read-only raw channels:
 *   - illiminance_clear [lux]
 *   - illiminance_ir
 *   - proximity
 *
 * Triggered buffer:
 *   - illiminance_clear
 *   - illiminance_ir
 *   - proximity
 *
 * Events:
 *   - illuminance_clear (rising and falling)
 *   - proximity (rising and falling)
 *     - both falling and rising thresholds for the proximity events
 *       must be set to the values greater than 0.
 *
 * The driver supports triggered buffers for all the three
 * channels as well as high and low threshold events for the
 * illuminance_clear and proxmimity channels. Triggers
 * can be enabled simultaneously with both illuminance_clear
 * events. Proximity events cannot be enabled simultaneously
 * with any triggers or illuminance events. Enabling/disabling
 * one of the proximity events automatically enables/disables
 * the other one.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 */

#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irq_work.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/iio/buffer.h>
#include <linux/iio/events.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>

#define GP2A_I2C_NAME "gp2ap020a00f"

/* Registers */
#define GP2AP020A00F_OP_REG	0x00 /* Basic operations */
#define GP2AP020A00F_ALS_REG	0x01 /* ALS related settings */
#define GP2AP020A00F_PS_REG	0x02 /* PS related settings */
#define GP2AP020A00F_LED_REG	0x03 /* LED reg */
#define GP2AP020A00F_TL_L_REG	0x04 /* ALS: Threshold low LSB */
#define GP2AP020A00F_TL_H_REG	0x05 /* ALS: Threshold low MSB */
#define GP2AP020A00F_TH_L_REG	0x06 /* ALS: Threshold high LSB */
#define GP2AP020A00F_TH_H_REG	0x07 /* ALS: Threshold high MSB */
#define GP2AP020A00F_PL_L_REG	0x08 /* PS: Threshold low LSB */
#define GP2AP020A00F_PL_H_REG	0x09 /* PS: Threshold low MSB */
#define GP2AP020A00F_PH_L_REG	0x0a /* PS: Threshold high LSB */
#define GP2AP020A00F_PH_H_REG	0x0b /* PS: Threshold high MSB */
#define GP2AP020A00F_D0_L_REG	0x0c /* ALS result: Clear/Illuminance LSB */
#define GP2AP020A00F_D0_H_REG	0x0d /* ALS result: Clear/Illuminance MSB */
#define GP2AP020A00F_D1_L_REG	0x0e /* ALS result: IR LSB */
#define GP2AP020A00F_D1_H_REG	0x0f /* ALS result: IR LSB */
#define GP2AP020A00F_D2_L_REG	0x10 /* PS result LSB */
#define GP2AP020A00F_D2_H_REG	0x11 /* PS result MSB */
#define GP2AP020A00F_NUM_REGS	0x12 /* Number of registers */

/* OP_REG bits */
#define GP2AP020A00F_OP3_MASK		0x80 /* Software shutdown */
#define GP2AP020A00F_OP3_SHUTDOWN	0x00
#define GP2AP020A00F_OP3_OPERATION	0x80
#define GP2AP020A00F_OP2_MASK		0x40 /* Auto shutdown/Continuous mode */
#define GP2AP020A00F_OP2_AUTO_SHUTDOWN	0x00
#define GP2AP020A00F_OP2_CONT_OPERATION	0x40
#define GP2AP020A00F_OP_MASK		0x30 /* Operating mode selection  */
#define GP2AP020A00F_OP_ALS_AND_PS	0x00
#define GP2AP020A00F_OP_ALS		0x10
#define GP2AP020A00F_OP_PS		0x20
#define GP2AP020A00F_OP_DEBUG		0x30
#define GP2AP020A00F_PROX_MASK		0x08 /* PS: detection/non-detection */
#define GP2AP020A00F_PROX_NON_DETECT	0x00
#define GP2AP020A00F_PROX_DETECT	0x08
#define GP2AP020A00F_FLAG_P		0x04 /* PS: interrupt result  */
#define GP2AP020A00F_FLAG_A		0x02 /* ALS: interrupt result  */
#define GP2AP020A00F_TYPE_MASK		0x01 /* Output data type selection */
#define GP2AP020A00F_TYPE_MANUAL_CALC	0x00
#define GP2AP020A00F_TYPE_AUTO_CALC	0x01

/* ALS_REG bits */
#define GP2AP020A00F_PRST_MASK		0xc0 /* Number of measurement cycles */
#define GP2AP020A00F_PRST_ONCE		0x00
#define GP2AP020A00F_PRST_4_CYCLES	0x40
#define GP2AP020A00F_PRST_8_CYCLES	0x80
#define GP2AP020A00F_PRST_16_CYCLES	0xc0
#define GP2AP020A00F_RES_A_MASK		0x38 /* ALS: Resolution */
#define GP2AP020A00F_RES_A_800ms	0x00
#define GP2AP020A00F_RES_A_400ms	0x08
#define GP2AP020A00F_RES_A_200ms	0x10
#define GP2AP020A00F_RES_A_100ms	0x18
#define GP2AP020A00F_RES_A_25ms		0x20
#define GP2AP020A00F_RES_A_6_25ms	0x28
#define GP2AP020A00F_RES_A_1_56ms	0x30
#define GP2AP020A00F_RES_A_0_39ms	0x38
#define GP2AP020A00F_RANGE_A_MASK	0x07 /* ALS: Max measurable range */
#define GP2AP020A00F_RANGE_A_x1		0x00
#define GP2AP020A00F_RANGE_A_x2		0x01
#define GP2AP020A00F_RANGE_A_x4		0x02
#define GP2AP020A00F_RANGE_A_x8		0x03
#define GP2AP020A00F_RANGE_A_x16	0x04
#define GP2AP020A00F_RANGE_A_x32	0x05
#define GP2AP020A00F_RANGE_A_x64	0x06
#define GP2AP020A00F_RANGE_A_x128	0x07

/* PS_REG bits */
#define GP2AP020A00F_ALC_MASK		0x80 /* Auto light cancel */
#define GP2AP020A00F_ALC_ON		0x80
#define GP2AP020A00F_ALC_OFF		0x00
#define GP2AP020A00F_INTTYPE_MASK	0x40 /* Interrupt type setting */
#define GP2AP020A00F_INTTYPE_LEVEL	0x00
#define GP2AP020A00F_INTTYPE_PULSE	0x40
#define GP2AP020A00F_RES_P_MASK		0x38 /* PS: Resolution */
#define GP2AP020A00F_RES_P_800ms_x2	0x00
#define GP2AP020A00F_RES_P_400ms_x2	0x08
#define GP2AP020A00F_RES_P_200ms_x2	0x10
#define GP2AP020A00F_RES_P_100ms_x2	0x18
#define GP2AP020A00F_RES_P_25ms_x2	0x20
#define GP2AP020A00F_RES_P_6_25ms_x2	0x28
#define GP2AP020A00F_RES_P_1_56ms_x2	0x30
#define GP2AP020A00F_RES_P_0_39ms_x2	0x38
#define GP2AP020A00F_RANGE_P_MASK	0x07 /* PS: Max measurable range */
#define GP2AP020A00F_RANGE_P_x1		0x00
#define GP2AP020A00F_RANGE_P_x2		0x01
#define GP2AP020A00F_RANGE_P_x4		0x02
#define GP2AP020A00F_RANGE_P_x8		0x03
#define GP2AP020A00F_RANGE_P_x16	0x04
#define GP2AP020A00F_RANGE_P_x32	0x05
#define GP2AP020A00F_RANGE_P_x64	0x06
#define GP2AP020A00F_RANGE_P_x128	0x07

/* LED reg bits */
#define GP2AP020A00F_INTVAL_MASK	0xc0 /* Intermittent operating */
#define GP2AP020A00F_INTVAL_0		0x00
#define GP2AP020A00F_INTVAL_4		0x40
#define GP2AP020A00F_INTVAL_8		0x80
#define GP2AP020A00F_INTVAL_16		0xc0
#define GP2AP020A00F_IS_MASK		0x30 /* ILED drive peak current */
#define GP2AP020A00F_IS_13_8mA		0x00
#define GP2AP020A00F_IS_27_5mA		0x10
#define GP2AP020A00F_IS_55mA		0x20
#define GP2AP020A00F_IS_110mA		0x30
#define GP2AP020A00F_PIN_MASK		0x0c /* INT terminal setting */
#define GP2AP020A00F_PIN_ALS_OR_PS	0x00
#define GP2AP020A00F_PIN_ALS		0x04
#define GP2AP020A00F_PIN_PS		0x08
#define GP2AP020A00F_PIN_PS_DETECT	0x0c
#define GP2AP020A00F_FREQ_MASK		0x02 /* LED modulation frequency */
#define GP2AP020A00F_FREQ_327_5kHz	0x00
#define GP2AP020A00F_FREQ_81_8kHz	0x02
#define GP2AP020A00F_RST		0x01 /* Software reset */

#define GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR	0
#define GP2AP020A00F_SCAN_MODE_LIGHT_IR		1
#define GP2AP020A00F_SCAN_MODE_PROXIMITY	2
#define GP2AP020A00F_CHAN_TIMESTAMP		3

#define GP2AP020A00F_DATA_READY_TIMEOUT		msecs_to_jiffies(1000)
#define GP2AP020A00F_DATA_REG(chan)		(GP2AP020A00F_D0_L_REG + \
							(chan) * 2)
#define GP2AP020A00F_THRESH_REG(th_val_id)	(GP2AP020A00F_TL_L_REG + \
							(th_val_id) * 2)
#define GP2AP020A00F_THRESH_VAL_ID(reg_addr)	((reg_addr - 4) / 2)

#define GP2AP020A00F_SUBTRACT_MODE	0
#define GP2AP020A00F_ADD_MODE		1

#define GP2AP020A00F_MAX_CHANNELS	3

enum gp2ap020a00f_opmode {
	GP2AP020A00F_OPMODE_READ_RAW_CLEAR,
	GP2AP020A00F_OPMODE_READ_RAW_IR,
	GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY,
	GP2AP020A00F_OPMODE_ALS,
	GP2AP020A00F_OPMODE_PS,
	GP2AP020A00F_OPMODE_ALS_AND_PS,
	GP2AP020A00F_OPMODE_PROX_DETECT,
	GP2AP020A00F_OPMODE_SHUTDOWN,
	GP2AP020A00F_NUM_OPMODES,
};

enum gp2ap020a00f_cmd {
	GP2AP020A00F_CMD_READ_RAW_CLEAR,
	GP2AP020A00F_CMD_READ_RAW_IR,
	GP2AP020A00F_CMD_READ_RAW_PROXIMITY,
	GP2AP020A00F_CMD_TRIGGER_CLEAR_EN,
	GP2AP020A00F_CMD_TRIGGER_CLEAR_DIS,
	GP2AP020A00F_CMD_TRIGGER_IR_EN,
	GP2AP020A00F_CMD_TRIGGER_IR_DIS,
	GP2AP020A00F_CMD_TRIGGER_PROX_EN,
	GP2AP020A00F_CMD_TRIGGER_PROX_DIS,
	GP2AP020A00F_CMD_ALS_HIGH_EV_EN,
	GP2AP020A00F_CMD_ALS_HIGH_EV_DIS,
	GP2AP020A00F_CMD_ALS_LOW_EV_EN,
	GP2AP020A00F_CMD_ALS_LOW_EV_DIS,
	GP2AP020A00F_CMD_PROX_HIGH_EV_EN,
	GP2AP020A00F_CMD_PROX_HIGH_EV_DIS,
	GP2AP020A00F_CMD_PROX_LOW_EV_EN,
	GP2AP020A00F_CMD_PROX_LOW_EV_DIS,
};

enum gp2ap020a00f_flags {
	GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER,
	GP2AP020A00F_FLAG_ALS_IR_TRIGGER,
	GP2AP020A00F_FLAG_PROX_TRIGGER,
	GP2AP020A00F_FLAG_PROX_RISING_EV,
	GP2AP020A00F_FLAG_PROX_FALLING_EV,
	GP2AP020A00F_FLAG_ALS_RISING_EV,
	GP2AP020A00F_FLAG_ALS_FALLING_EV,
	GP2AP020A00F_FLAG_LUX_MODE_HI,
	GP2AP020A00F_FLAG_DATA_READY,
};

enum gp2ap020a00f_thresh_val_id {
	GP2AP020A00F_THRESH_TL,
	GP2AP020A00F_THRESH_TH,
	GP2AP020A00F_THRESH_PL,
	GP2AP020A00F_THRESH_PH,
};

struct gp2ap020a00f_data {
	const struct gp2ap020a00f_platform_data *pdata;
	struct i2c_client *client;
	struct mutex lock;
	char *buffer;
	struct regulator *vled_reg;
	unsigned long flags;
	enum gp2ap020a00f_opmode cur_opmode;
	struct iio_trigger *trig;
	struct regmap *regmap;
	unsigned int thresh_val[4];
	u8 debug_reg_addr;
	struct irq_work work;
	wait_queue_head_t data_ready_queue;
};

static const u8 gp2ap020a00f_reg_init_tab[] = {
	[GP2AP020A00F_OP_REG] = GP2AP020A00F_OP3_SHUTDOWN,
	[GP2AP020A00F_ALS_REG] = GP2AP020A00F_RES_A_25ms |
				 GP2AP020A00F_RANGE_A_x8,
	[GP2AP020A00F_PS_REG] = GP2AP020A00F_ALC_ON |
				GP2AP020A00F_RES_P_1_56ms_x2 |
				GP2AP020A00F_RANGE_P_x4,
	[GP2AP020A00F_LED_REG] = GP2AP020A00F_INTVAL_0 |
				 GP2AP020A00F_IS_110mA |
				 GP2AP020A00F_FREQ_327_5kHz,
	[GP2AP020A00F_TL_L_REG] = 0,
	[GP2AP020A00F_TL_H_REG] = 0,
	[GP2AP020A00F_TH_L_REG] = 0,
	[GP2AP020A00F_TH_H_REG] = 0,
	[GP2AP020A00F_PL_L_REG] = 0,
	[GP2AP020A00F_PL_H_REG] = 0,
	[GP2AP020A00F_PH_L_REG] = 0,
	[GP2AP020A00F_PH_H_REG] = 0,
};

static bool gp2ap020a00f_is_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case GP2AP020A00F_OP_REG:
	case GP2AP020A00F_D0_L_REG:
	case GP2AP020A00F_D0_H_REG:
	case GP2AP020A00F_D1_L_REG:
	case GP2AP020A00F_D1_H_REG:
	case GP2AP020A00F_D2_L_REG:
	case GP2AP020A00F_D2_H_REG:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config gp2ap020a00f_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = GP2AP020A00F_D2_H_REG,
	.cache_type = REGCACHE_RBTREE,

	.volatile_reg = gp2ap020a00f_is_volatile_reg,
};

static const struct gp2ap020a00f_mutable_config_regs {
	u8 op_reg;
	u8 als_reg;
	u8 ps_reg;
	u8 led_reg;
} opmode_regs_settings[GP2AP020A00F_NUM_OPMODES] = {
	[GP2AP020A00F_OPMODE_READ_RAW_CLEAR] = {
		GP2AP020A00F_OP_ALS | GP2AP020A00F_OP2_CONT_OPERATION
		| GP2AP020A00F_OP3_OPERATION
		| GP2AP020A00F_TYPE_AUTO_CALC,
		GP2AP020A00F_PRST_ONCE,
		GP2AP020A00F_INTTYPE_LEVEL,
		GP2AP020A00F_PIN_ALS
	},
	[GP2AP020A00F_OPMODE_READ_RAW_IR] = {
		GP2AP020A00F_OP_ALS | GP2AP020A00F_OP2_CONT_OPERATION
		| GP2AP020A00F_OP3_OPERATION
		| GP2AP020A00F_TYPE_MANUAL_CALC,
		GP2AP020A00F_PRST_ONCE,
		GP2AP020A00F_INTTYPE_LEVEL,
		GP2AP020A00F_PIN_ALS
	},
	[GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY] = {
		GP2AP020A00F_OP_PS | GP2AP020A00F_OP2_CONT_OPERATION
		| GP2AP020A00F_OP3_OPERATION
		| GP2AP020A00F_TYPE_MANUAL_CALC,
		GP2AP020A00F_PRST_ONCE,
		GP2AP020A00F_INTTYPE_LEVEL,
		GP2AP020A00F_PIN_PS
	},
	[GP2AP020A00F_OPMODE_PROX_DETECT] = {
		GP2AP020A00F_OP_PS | GP2AP020A00F_OP2_CONT_OPERATION
		| GP2AP020A00F_OP3_OPERATION
		| GP2AP020A00F_TYPE_MANUAL_CALC,
		GP2AP020A00F_PRST_4_CYCLES,
		GP2AP020A00F_INTTYPE_PULSE,
		GP2AP020A00F_PIN_PS_DETECT
	},
	[GP2AP020A00F_OPMODE_ALS] = {
		GP2AP020A00F_OP_ALS | GP2AP020A00F_OP2_CONT_OPERATION
		| GP2AP020A00F_OP3_OPERATION
		| GP2AP020A00F_TYPE_AUTO_CALC,
		GP2AP020A00F_PRST_ONCE,
		GP2AP020A00F_INTTYPE_LEVEL,
		GP2AP020A00F_PIN_ALS
	},
	[GP2AP020A00F_OPMODE_PS] = {
		GP2AP020A00F_OP_PS | GP2AP020A00F_OP2_CONT_OPERATION
		| GP2AP020A00F_OP3_OPERATION
		| GP2AP020A00F_TYPE_MANUAL_CALC,
		GP2AP020A00F_PRST_4_CYCLES,
		GP2AP020A00F_INTTYPE_LEVEL,
		GP2AP020A00F_PIN_PS
	},
	[GP2AP020A00F_OPMODE_ALS_AND_PS] = {
		GP2AP020A00F_OP_ALS_AND_PS
		| GP2AP020A00F_OP2_CONT_OPERATION
		| GP2AP020A00F_OP3_OPERATION
		| GP2AP020A00F_TYPE_AUTO_CALC,
		GP2AP020A00F_PRST_4_CYCLES,
		GP2AP020A00F_INTTYPE_LEVEL,
		GP2AP020A00F_PIN_ALS_OR_PS
	},
	[GP2AP020A00F_OPMODE_SHUTDOWN] = { GP2AP020A00F_OP3_SHUTDOWN, },
};

static int gp2ap020a00f_set_operation_mode(struct gp2ap020a00f_data *data,
					enum gp2ap020a00f_opmode op)
{
	unsigned int op_reg_val;
	int err;

	if (op != GP2AP020A00F_OPMODE_SHUTDOWN) {
		err = regmap_read(data->regmap, GP2AP020A00F_OP_REG,
					&op_reg_val);
		if (err < 0)
			return err;
		/*
		 * Shutdown the device if the operation being executed entails
		 * mode transition.
		 */
		if ((opmode_regs_settings[op].op_reg & GP2AP020A00F_OP_MASK) !=
		    (op_reg_val & GP2AP020A00F_OP_MASK)) {
			/* set shutdown mode */
			err = regmap_update_bits(data->regmap,
				GP2AP020A00F_OP_REG, GP2AP020A00F_OP3_MASK,
				GP2AP020A00F_OP3_SHUTDOWN);
			if (err < 0)
				return err;
		}

		err = regmap_update_bits(data->regmap, GP2AP020A00F_ALS_REG,
			GP2AP020A00F_PRST_MASK, opmode_regs_settings[op]
								.als_reg);
		if (err < 0)
			return err;

		err = regmap_update_bits(data->regmap, GP2AP020A00F_PS_REG,
			GP2AP020A00F_INTTYPE_MASK, opmode_regs_settings[op]
								.ps_reg);
		if (err < 0)
			return err;

		err = regmap_update_bits(data->regmap, GP2AP020A00F_LED_REG,
			GP2AP020A00F_PIN_MASK, opmode_regs_settings[op]
								.led_reg);
		if (err < 0)
			return err;
	}

	/* Set OP_REG and apply operation mode (power on / off) */
	err = regmap_update_bits(data->regmap,
				 GP2AP020A00F_OP_REG,
				 GP2AP020A00F_OP_MASK | GP2AP020A00F_OP2_MASK |
				 GP2AP020A00F_OP3_MASK | GP2AP020A00F_TYPE_MASK,
				 opmode_regs_settings[op].op_reg);
	if (err < 0)
		return err;

	data->cur_opmode = op;

	return 0;
}

static bool gp2ap020a00f_als_enabled(struct gp2ap020a00f_data *data)
{
	return test_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &data->flags) ||
	       test_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &data->flags) ||
	       test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags) ||
	       test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags);
}

static bool gp2ap020a00f_prox_detect_enabled(struct gp2ap020a00f_data *data)
{
	return test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags) ||
	       test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags);
}

static int gp2ap020a00f_write_event_threshold(struct gp2ap020a00f_data *data,
				enum gp2ap020a00f_thresh_val_id th_val_id,
				bool enable)
{
	__le16 thresh_buf = 0;
	unsigned int thresh_reg_val;

	if (!enable)
		thresh_reg_val = 0;
	else if (test_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags) &&
		 th_val_id != GP2AP020A00F_THRESH_PL &&
		 th_val_id != GP2AP020A00F_THRESH_PH)
		/*
		 * For the high lux mode ALS threshold has to be scaled down
		 * to allow for proper comparison with the output value.
		 */
		thresh_reg_val = data->thresh_val[th_val_id] / 16;
	else
		thresh_reg_val = data->thresh_val[th_val_id] > 16000 ?
					16000 :
					data->thresh_val[th_val_id];

	thresh_buf = cpu_to_le16(thresh_reg_val);

	return regmap_bulk_write(data->regmap,
				 GP2AP020A00F_THRESH_REG(th_val_id),
				 (u8 *)&thresh_buf, 2);
}

static int gp2ap020a00f_alter_opmode(struct gp2ap020a00f_data *data,
			enum gp2ap020a00f_opmode diff_mode, int add_sub)
{
	enum gp2ap020a00f_opmode new_mode;

	if (diff_mode != GP2AP020A00F_OPMODE_ALS &&
	    diff_mode != GP2AP020A00F_OPMODE_PS)
		return -EINVAL;

	if (add_sub == GP2AP020A00F_ADD_MODE) {
		if (data->cur_opmode == GP2AP020A00F_OPMODE_SHUTDOWN)
			new_mode =  diff_mode;
		else
			new_mode = GP2AP020A00F_OPMODE_ALS_AND_PS;
	} else {
		if (data->cur_opmode == GP2AP020A00F_OPMODE_ALS_AND_PS)
			new_mode = (diff_mode == GP2AP020A00F_OPMODE_ALS) ?
					GP2AP020A00F_OPMODE_PS :
					GP2AP020A00F_OPMODE_ALS;
		else
			new_mode = GP2AP020A00F_OPMODE_SHUTDOWN;
	}

	return gp2ap020a00f_set_operation_mode(data, new_mode);
}

static int gp2ap020a00f_exec_cmd(struct gp2ap020a00f_data *data,
					enum gp2ap020a00f_cmd cmd)
{
	int err = 0;

	switch (cmd) {
	case GP2AP020A00F_CMD_READ_RAW_CLEAR:
		if (data->cur_opmode != GP2AP020A00F_OPMODE_SHUTDOWN)
			return -EBUSY;
		err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_READ_RAW_CLEAR);
		break;
	case GP2AP020A00F_CMD_READ_RAW_IR:
		if (data->cur_opmode != GP2AP020A00F_OPMODE_SHUTDOWN)
			return -EBUSY;
		err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_READ_RAW_IR);
		break;
	case GP2AP020A00F_CMD_READ_RAW_PROXIMITY:
		if (data->cur_opmode != GP2AP020A00F_OPMODE_SHUTDOWN)
			return -EBUSY;
		err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY);
		break;
	case GP2AP020A00F_CMD_TRIGGER_CLEAR_EN:
		if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
			return -EBUSY;
		if (!gp2ap020a00f_als_enabled(data))
			err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_ADD_MODE);
		set_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &data->flags);
		break;
	case GP2AP020A00F_CMD_TRIGGER_CLEAR_DIS:
		clear_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &data->flags);
		if (gp2ap020a00f_als_enabled(data))
			break;
		err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_SUBTRACT_MODE);
		break;
	case GP2AP020A00F_CMD_TRIGGER_IR_EN:
		if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
			return -EBUSY;
		if (!gp2ap020a00f_als_enabled(data))
			err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_ADD_MODE);
		set_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &data->flags);
		break;
	case GP2AP020A00F_CMD_TRIGGER_IR_DIS:
		clear_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &data->flags);
		if (gp2ap020a00f_als_enabled(data))
			break;
		err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_SUBTRACT_MODE);
		break;
	case GP2AP020A00F_CMD_TRIGGER_PROX_EN:
		if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
			return -EBUSY;
		err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_PS,
						GP2AP020A00F_ADD_MODE);
		set_bit(GP2AP020A00F_FLAG_PROX_TRIGGER, &data->flags);
		break;
	case GP2AP020A00F_CMD_TRIGGER_PROX_DIS:
		clear_bit(GP2AP020A00F_FLAG_PROX_TRIGGER, &data->flags);
		err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_PS,
						GP2AP020A00F_SUBTRACT_MODE);
		break;
	case GP2AP020A00F_CMD_ALS_HIGH_EV_EN:
		if (test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags))
			return 0;
		if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
			return -EBUSY;
		if (!gp2ap020a00f_als_enabled(data)) {
			err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_ADD_MODE);
			if (err < 0)
				return err;
		}
		set_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags);
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TH, true);
		break;
	case GP2AP020A00F_CMD_ALS_HIGH_EV_DIS:
		if (!test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags))
			return 0;
		clear_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags);
		if (!gp2ap020a00f_als_enabled(data)) {
			err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_SUBTRACT_MODE);
			if (err < 0)
				return err;
		}
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TH, false);
		break;
	case GP2AP020A00F_CMD_ALS_LOW_EV_EN:
		if (test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags))
			return 0;
		if (data->cur_opmode == GP2AP020A00F_OPMODE_PROX_DETECT)
			return -EBUSY;
		if (!gp2ap020a00f_als_enabled(data)) {
			err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_ADD_MODE);
			if (err < 0)
				return err;
		}
		set_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags);
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TL, true);
		break;
	case GP2AP020A00F_CMD_ALS_LOW_EV_DIS:
		if (!test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags))
			return 0;
		clear_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags);
		if (!gp2ap020a00f_als_enabled(data)) {
			err = gp2ap020a00f_alter_opmode(data,
						GP2AP020A00F_OPMODE_ALS,
						GP2AP020A00F_SUBTRACT_MODE);
			if (err < 0)
				return err;
		}
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TL, false);
		break;
	case GP2AP020A00F_CMD_PROX_HIGH_EV_EN:
		if (test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags))
			return 0;
		if (gp2ap020a00f_als_enabled(data) ||
		    data->cur_opmode == GP2AP020A00F_OPMODE_PS)
			return -EBUSY;
		if (!gp2ap020a00f_prox_detect_enabled(data)) {
			err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_PROX_DETECT);
			if (err < 0)
				return err;
		}
		set_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags);
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_PH, true);
		break;
	case GP2AP020A00F_CMD_PROX_HIGH_EV_DIS:
		if (!test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags))
			return 0;
		clear_bit(GP2AP020A00F_FLAG_PROX_RISING_EV, &data->flags);
		err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_SHUTDOWN);
		if (err < 0)
			return err;
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_PH, false);
		break;
	case GP2AP020A00F_CMD_PROX_LOW_EV_EN:
		if (test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags))
			return 0;
		if (gp2ap020a00f_als_enabled(data) ||
		    data->cur_opmode == GP2AP020A00F_OPMODE_PS)
			return -EBUSY;
		if (!gp2ap020a00f_prox_detect_enabled(data)) {
			err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_PROX_DETECT);
			if (err < 0)
				return err;
		}
		set_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags);
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_PL, true);
		break;
	case GP2AP020A00F_CMD_PROX_LOW_EV_DIS:
		if (!test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags))
			return 0;
		clear_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV, &data->flags);
		err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_SHUTDOWN);
		if (err < 0)
			return err;
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_PL, false);
		break;
	}

	return err;
}

static int wait_conversion_complete_irq(struct gp2ap020a00f_data *data)
{
	int ret;

	ret = wait_event_timeout(data->data_ready_queue,
				 test_bit(GP2AP020A00F_FLAG_DATA_READY,
					  &data->flags),
				 GP2AP020A00F_DATA_READY_TIMEOUT);
	clear_bit(GP2AP020A00F_FLAG_DATA_READY, &data->flags);

	return ret > 0 ? 0 : -ETIME;
}

static int gp2ap020a00f_read_output(struct gp2ap020a00f_data *data,
					unsigned int output_reg, int *val)
{
	u8 reg_buf[2];
	int err;

	err = wait_conversion_complete_irq(data);
	if (err < 0)
		dev_dbg(&data->client->dev, "data ready timeout\n");

	err = regmap_bulk_read(data->regmap, output_reg, reg_buf, 2);
	if (err < 0)
		return err;

	*val = le16_to_cpup((__le16 *)reg_buf);

	return err;
}

static bool gp2ap020a00f_adjust_lux_mode(struct gp2ap020a00f_data *data,
				 int output_val)
{
	u8 new_range = 0xff;
	int err;

	if (!test_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags)) {
		if (output_val > 16000) {
			set_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags);
			new_range = GP2AP020A00F_RANGE_A_x128;
		}
	} else {
		if (output_val < 1000) {
			clear_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags);
			new_range = GP2AP020A00F_RANGE_A_x8;
		}
	}

	if (new_range != 0xff) {
		/* Clear als threshold registers to avoid spurious
		 * events caused by lux mode transition.
		 */
		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TH, false);
		if (err < 0) {
			dev_err(&data->client->dev,
				"Clearing als threshold register failed.\n");
			return false;
		}

		err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TL, false);
		if (err < 0) {
			dev_err(&data->client->dev,
				"Clearing als threshold register failed.\n");
			return false;
		}

		/* Change lux mode */
		err = regmap_update_bits(data->regmap,
			GP2AP020A00F_OP_REG,
			GP2AP020A00F_OP3_MASK,
			GP2AP020A00F_OP3_SHUTDOWN);

		if (err < 0) {
			dev_err(&data->client->dev,
				"Shutting down the device failed.\n");
			return false;
		}

		err = regmap_update_bits(data->regmap,
			GP2AP020A00F_ALS_REG,
			GP2AP020A00F_RANGE_A_MASK,
			new_range);

		if (err < 0) {
			dev_err(&data->client->dev,
				"Adjusting device lux mode failed.\n");
			return false;
		}

		err = regmap_update_bits(data->regmap,
			GP2AP020A00F_OP_REG,
			GP2AP020A00F_OP3_MASK,
			GP2AP020A00F_OP3_OPERATION);

		if (err < 0) {
			dev_err(&data->client->dev,
				"Powering up the device failed.\n");
			return false;
		}

		/* Adjust als threshold register values to the new lux mode */
		if (test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &data->flags)) {
			err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TH, true);
			if (err < 0) {
				dev_err(&data->client->dev,
				"Adjusting als threshold value failed.\n");
				return false;
			}
		}

		if (test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &data->flags)) {
			err =  gp2ap020a00f_write_event_threshold(data,
					GP2AP020A00F_THRESH_TL, true);
			if (err < 0) {
				dev_err(&data->client->dev,
				"Adjusting als threshold value failed.\n");
				return false;
			}
		}

		return true;
	}

	return false;
}

static void gp2ap020a00f_output_to_lux(struct gp2ap020a00f_data *data,
						int *output_val)
{
	if (test_bit(GP2AP020A00F_FLAG_LUX_MODE_HI, &data->flags))
		*output_val *= 16;
}

static void gp2ap020a00f_iio_trigger_work(struct irq_work *work)
{
	struct gp2ap020a00f_data *data =
		container_of(work, struct gp2ap020a00f_data, work);

	iio_trigger_poll(data->trig, 0);
}

static irqreturn_t gp2ap020a00f_prox_sensing_handler(int irq, void *data)
{
	struct iio_dev *indio_dev = data;
	struct gp2ap020a00f_data *priv = iio_priv(indio_dev);
	unsigned int op_reg_val;
	int ret;

	/* Read interrupt flags */
	ret = regmap_read(priv->regmap, GP2AP020A00F_OP_REG, &op_reg_val);
	if (ret < 0)
		return IRQ_HANDLED;

	if (gp2ap020a00f_prox_detect_enabled(priv)) {
		if (op_reg_val & GP2AP020A00F_PROX_DETECT) {
			iio_push_event(indio_dev,
			       IIO_UNMOD_EVENT_CODE(
				    IIO_PROXIMITY,
				    GP2AP020A00F_SCAN_MODE_PROXIMITY,
				    IIO_EV_TYPE_ROC,
				    IIO_EV_DIR_RISING),
			       iio_get_time_ns());
		} else {
			iio_push_event(indio_dev,
			       IIO_UNMOD_EVENT_CODE(
				    IIO_PROXIMITY,
				    GP2AP020A00F_SCAN_MODE_PROXIMITY,
				    IIO_EV_TYPE_ROC,
				    IIO_EV_DIR_FALLING),
			       iio_get_time_ns());
		}
	}

	return IRQ_HANDLED;
}

static irqreturn_t gp2ap020a00f_thresh_event_handler(int irq, void *data)
{
	struct iio_dev *indio_dev = data;
	struct gp2ap020a00f_data *priv = iio_priv(indio_dev);
	u8 op_reg_flags, d0_reg_buf[2];
	unsigned int output_val, op_reg_val;
	int thresh_val_id, ret;

	/* Read interrupt flags */
	ret = regmap_read(priv->regmap, GP2AP020A00F_OP_REG,
							&op_reg_val);
	if (ret < 0)
		goto done;

	op_reg_flags = op_reg_val & (GP2AP020A00F_FLAG_A | GP2AP020A00F_FLAG_P
					| GP2AP020A00F_PROX_DETECT);

	op_reg_val &= (~GP2AP020A00F_FLAG_A & ~GP2AP020A00F_FLAG_P
					& ~GP2AP020A00F_PROX_DETECT);

	/* Clear interrupt flags (if not in INTTYPE_PULSE mode) */
	if (priv->cur_opmode != GP2AP020A00F_OPMODE_PROX_DETECT) {
		ret = regmap_write(priv->regmap, GP2AP020A00F_OP_REG,
								op_reg_val);
		if (ret < 0)
			goto done;
	}

	if (op_reg_flags & GP2AP020A00F_FLAG_A) {
		/* Check D0 register to assess if the lux mode
		 * transition is required.
		 */
		ret = regmap_bulk_read(priv->regmap, GP2AP020A00F_D0_L_REG,
							d0_reg_buf, 2);
		if (ret < 0)
			goto done;

		output_val = le16_to_cpup((__le16 *)d0_reg_buf);

		if (gp2ap020a00f_adjust_lux_mode(priv, output_val))
			goto done;

		gp2ap020a00f_output_to_lux(priv, &output_val);

		/*
		 * We need to check output value to distinguish
		 * between high and low ambient light threshold event.
		 */
		if (test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV, &priv->flags)) {
			thresh_val_id =
			    GP2AP020A00F_THRESH_VAL_ID(GP2AP020A00F_TH_L_REG);
			if (output_val > priv->thresh_val[thresh_val_id])
				iio_push_event(indio_dev,
				       IIO_MOD_EVENT_CODE(
					    IIO_LIGHT,
					    GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR,
					    IIO_MOD_LIGHT_CLEAR,
					    IIO_EV_TYPE_THRESH,
					    IIO_EV_DIR_RISING),
				       iio_get_time_ns());
		}

		if (test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV, &priv->flags)) {
			thresh_val_id =
			    GP2AP020A00F_THRESH_VAL_ID(GP2AP020A00F_TL_L_REG);
			if (output_val < priv->thresh_val[thresh_val_id])
				iio_push_event(indio_dev,
				       IIO_MOD_EVENT_CODE(
					    IIO_LIGHT,
					    GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR,
					    IIO_MOD_LIGHT_CLEAR,
					    IIO_EV_TYPE_THRESH,
					    IIO_EV_DIR_FALLING),
				       iio_get_time_ns());
		}
	}

	if (priv->cur_opmode == GP2AP020A00F_OPMODE_READ_RAW_CLEAR ||
	    priv->cur_opmode == GP2AP020A00F_OPMODE_READ_RAW_IR ||
	    priv->cur_opmode == GP2AP020A00F_OPMODE_READ_RAW_PROXIMITY) {
		set_bit(GP2AP020A00F_FLAG_DATA_READY, &priv->flags);
		wake_up(&priv->data_ready_queue);
		goto done;
	}

	if (test_bit(GP2AP020A00F_FLAG_ALS_CLEAR_TRIGGER, &priv->flags) ||
	    test_bit(GP2AP020A00F_FLAG_ALS_IR_TRIGGER, &priv->flags) ||
	    test_bit(GP2AP020A00F_FLAG_PROX_TRIGGER, &priv->flags))
		/* This fires off the trigger. */
		irq_work_queue(&priv->work);

done:
	return IRQ_HANDLED;
}

static irqreturn_t gp2ap020a00f_trigger_handler(int irq, void *data)
{
	struct iio_poll_func *pf = data;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct gp2ap020a00f_data *priv = iio_priv(indio_dev);
	size_t d_size = 0;
	__le32 light_lux;
	int i, out_val, ret;

	for_each_set_bit(i, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		ret = regmap_bulk_read(priv->regmap,
				GP2AP020A00F_DATA_REG(i),
				&priv->buffer[d_size], 2);
		if (ret < 0)
			goto done;

		if (i == GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR ||
		    i == GP2AP020A00F_SCAN_MODE_LIGHT_IR) {
			out_val = le16_to_cpup((__le16 *)&priv->buffer[d_size]);
			gp2ap020a00f_output_to_lux(priv, &out_val);
			light_lux = cpu_to_le32(out_val);
			memcpy(&priv->buffer[d_size], (u8 *)&light_lux, 4);
			d_size += 4;
		} else {
			d_size += 2;
		}
	}

	iio_push_to_buffers_with_timestamp(indio_dev, priv->buffer,
		pf->timestamp);
done:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static u8 gp2ap020a00f_get_thresh_reg(const struct iio_chan_spec *chan,
					     enum iio_event_direction event_dir)
{
	switch (chan->type) {
	case IIO_PROXIMITY:
		if (event_dir == IIO_EV_DIR_RISING)
			return GP2AP020A00F_PH_L_REG;
		else
			return GP2AP020A00F_PL_L_REG;
	case IIO_LIGHT:
		if (event_dir == IIO_EV_DIR_RISING)
			return GP2AP020A00F_TH_L_REG;
		else
			return GP2AP020A00F_TL_L_REG;
	default:
		break;
	}

	return -EINVAL;
}

static int gp2ap020a00f_write_event_val(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 gp2ap020a00f_data *data = iio_priv(indio_dev);
	bool event_en = false;
	u8 thresh_val_id;
	u8 thresh_reg_l;
	int err = 0;

	mutex_lock(&data->lock);

	thresh_reg_l = gp2ap020a00f_get_thresh_reg(chan, dir);
	thresh_val_id = GP2AP020A00F_THRESH_VAL_ID(thresh_reg_l);

	if (thresh_val_id > GP2AP020A00F_THRESH_PH) {
		err = -EINVAL;
		goto error_unlock;
	}

	switch (thresh_reg_l) {
	case GP2AP020A00F_TH_L_REG:
		event_en = test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV,
							&data->flags);
		break;
	case GP2AP020A00F_TL_L_REG:
		event_en = test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV,
							&data->flags);
		break;
	case GP2AP020A00F_PH_L_REG:
		if (val == 0) {
			err = -EINVAL;
			goto error_unlock;
		}
		event_en = test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV,
							&data->flags);
		break;
	case GP2AP020A00F_PL_L_REG:
		if (val == 0) {
			err = -EINVAL;
			goto error_unlock;
		}
		event_en = test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV,
							&data->flags);
		break;
	}

	data->thresh_val[thresh_val_id] = val;
	err =  gp2ap020a00f_write_event_threshold(data, thresh_val_id,
							event_en);
error_unlock:
	mutex_unlock(&data->lock);

	return err;
}

static int gp2ap020a00f_read_event_val(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 gp2ap020a00f_data *data = iio_priv(indio_dev);
	u8 thresh_reg_l;
	int err = IIO_VAL_INT;

	mutex_lock(&data->lock);

	thresh_reg_l = gp2ap020a00f_get_thresh_reg(chan, dir);

	if (thresh_reg_l > GP2AP020A00F_PH_L_REG) {
		err = -EINVAL;
		goto error_unlock;
	}

	*val = data->thresh_val[GP2AP020A00F_THRESH_VAL_ID(thresh_reg_l)];

error_unlock:
	mutex_unlock(&data->lock);

	return err;
}

static int gp2ap020a00f_write_prox_event_config(struct iio_dev *indio_dev,
						int state)
{
	struct gp2ap020a00f_data *data = iio_priv(indio_dev);
	enum gp2ap020a00f_cmd cmd_high_ev, cmd_low_ev;
	int err;

	cmd_high_ev = state ? GP2AP020A00F_CMD_PROX_HIGH_EV_EN :
			      GP2AP020A00F_CMD_PROX_HIGH_EV_DIS;
	cmd_low_ev = state ? GP2AP020A00F_CMD_PROX_LOW_EV_EN :
			     GP2AP020A00F_CMD_PROX_LOW_EV_DIS;

	/*
	 * In order to enable proximity detection feature in the device
	 * both high and low threshold registers have to be written
	 * with different values, greater than zero.
	 */
	if (state) {
		if (data->thresh_val[GP2AP020A00F_THRESH_PL] == 0)
			return -EINVAL;

		if (data->thresh_val[GP2AP020A00F_THRESH_PH] == 0)
			return -EINVAL;
	}

	err = gp2ap020a00f_exec_cmd(data, cmd_high_ev);
	if (err < 0)
		return err;

	err = gp2ap020a00f_exec_cmd(data, cmd_low_ev);
	if (err < 0)
		return err;

	free_irq(data->client->irq, indio_dev);

	if (state)
		err = request_threaded_irq(data->client->irq, NULL,
					   &gp2ap020a00f_prox_sensing_handler,
					   IRQF_TRIGGER_RISING |
					   IRQF_TRIGGER_FALLING |
					   IRQF_ONESHOT,
					   "gp2ap020a00f_prox_sensing",
					   indio_dev);
	else {
		err = request_threaded_irq(data->client->irq, NULL,
					   &gp2ap020a00f_thresh_event_handler,
					   IRQF_TRIGGER_FALLING |
					   IRQF_ONESHOT,
					   "gp2ap020a00f_thresh_event",
					   indio_dev);
	}

	return err;
}

static int gp2ap020a00f_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 gp2ap020a00f_data *data = iio_priv(indio_dev);
	enum gp2ap020a00f_cmd cmd;
	int err;

	mutex_lock(&data->lock);

	switch (chan->type) {
	case IIO_PROXIMITY:
		err = gp2ap020a00f_write_prox_event_config(indio_dev, state);
		break;
	case IIO_LIGHT:
		if (dir == IIO_EV_DIR_RISING) {
			cmd = state ? GP2AP020A00F_CMD_ALS_HIGH_EV_EN :
				      GP2AP020A00F_CMD_ALS_HIGH_EV_DIS;
			err = gp2ap020a00f_exec_cmd(data, cmd);
		} else {
			cmd = state ? GP2AP020A00F_CMD_ALS_LOW_EV_EN :
				      GP2AP020A00F_CMD_ALS_LOW_EV_DIS;
			err = gp2ap020a00f_exec_cmd(data, cmd);
		}
		break;
	default:
		err = -EINVAL;
	}

	mutex_unlock(&data->lock);

	return err;
}

static int gp2ap020a00f_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 gp2ap020a00f_data *data = iio_priv(indio_dev);
	int event_en = 0;

	mutex_lock(&data->lock);

	switch (chan->type) {
	case IIO_PROXIMITY:
		if (dir == IIO_EV_DIR_RISING)
			event_en = test_bit(GP2AP020A00F_FLAG_PROX_RISING_EV,
								&data->flags);
		else
			event_en = test_bit(GP2AP020A00F_FLAG_PROX_FALLING_EV,
								&data->flags);
		break;
	case IIO_LIGHT:
		if (dir == IIO_EV_DIR_RISING)
			event_en = test_bit(GP2AP020A00F_FLAG_ALS_RISING_EV,
								&data->flags);
		else
			event_en = test_bit(GP2AP020A00F_FLAG_ALS_FALLING_EV,
								&data->flags);
		break;
	default:
		event_en = -EINVAL;
		break;
	}

	mutex_unlock(&data->lock);

	return event_en;
}

static int gp2ap020a00f_read_channel(struct gp2ap020a00f_data *data,
				struct iio_chan_spec const *chan, int *val)
{
	enum gp2ap020a00f_cmd cmd;
	int err;

	switch (chan->scan_index) {
	case GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR:
		cmd = GP2AP020A00F_CMD_READ_RAW_CLEAR;
		break;
	case GP2AP020A00F_SCAN_MODE_LIGHT_IR:
		cmd = GP2AP020A00F_CMD_READ_RAW_IR;
		break;
	case GP2AP020A00F_SCAN_MODE_PROXIMITY:
		cmd = GP2AP020A00F_CMD_READ_RAW_PROXIMITY;
		break;
	default:
		return -EINVAL;
	}

	err = gp2ap020a00f_exec_cmd(data, cmd);
	if (err < 0) {
		dev_err(&data->client->dev,
			"gp2ap020a00f_exec_cmd failed\n");
		goto error_ret;
	}

	err = gp2ap020a00f_read_output(data, chan->address, val);
	if (err < 0)
		dev_err(&data->client->dev,
			"gp2ap020a00f_read_output failed\n");

	err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_SHUTDOWN);
	if (err < 0)
		dev_err(&data->client->dev,
			"Failed to shut down the device.\n");

	if (cmd == GP2AP020A00F_CMD_READ_RAW_CLEAR ||
	    cmd == GP2AP020A00F_CMD_READ_RAW_IR)
		gp2ap020a00f_output_to_lux(data, val);

error_ret:
	return err;
}

static int gp2ap020a00f_read_raw(struct iio_dev *indio_dev,
			   struct iio_chan_spec const *chan,
			   int *val, int *val2,
			   long mask)
{
	struct gp2ap020a00f_data *data = iio_priv(indio_dev);
	int err = -EINVAL;

	mutex_lock(&data->lock);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (iio_buffer_enabled(indio_dev)) {
			err = -EBUSY;
			goto error_unlock;
		}

		err = gp2ap020a00f_read_channel(data, chan, val);
		break;
	}

error_unlock:
	mutex_unlock(&data->lock);

	return err < 0 ? err : IIO_VAL_INT;
}

static const struct iio_event_spec gp2ap020a00f_event_spec_light[] = {
	{
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	}, {
		.type = IIO_EV_TYPE_THRESH,
		.dir = IIO_EV_DIR_FALLING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	},
};

static const struct iio_event_spec gp2ap020a00f_event_spec_prox[] = {
	{
		.type = IIO_EV_TYPE_ROC,
		.dir = IIO_EV_DIR_RISING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	}, {
		.type = IIO_EV_TYPE_ROC,
		.dir = IIO_EV_DIR_FALLING,
		.mask_separate = BIT(IIO_EV_INFO_VALUE) |
			BIT(IIO_EV_INFO_ENABLE),
	},
};

static const struct iio_chan_spec gp2ap020a00f_channels[] = {
	{
		.type = IIO_LIGHT,
		.channel2 = IIO_MOD_LIGHT_CLEAR,
		.modified = 1,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.scan_type = {
			.sign = 'u',
			.realbits = 24,
			.shift = 0,
			.storagebits = 32,
			.endianness = IIO_LE,
		},
		.scan_index = GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR,
		.address = GP2AP020A00F_D0_L_REG,
		.event_spec = gp2ap020a00f_event_spec_light,
		.num_event_specs = ARRAY_SIZE(gp2ap020a00f_event_spec_light),
	},
	{
		.type = IIO_LIGHT,
		.channel2 = IIO_MOD_LIGHT_IR,
		.modified = 1,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.scan_type = {
			.sign = 'u',
			.realbits = 24,
			.shift = 0,
			.storagebits = 32,
			.endianness = IIO_LE,
		},
		.scan_index = GP2AP020A00F_SCAN_MODE_LIGHT_IR,
		.address = GP2AP020A00F_D1_L_REG,
	},
	{
		.type = IIO_PROXIMITY,
		.modified = 0,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.scan_type = {
			.sign = 'u',
			.realbits = 16,
			.shift = 0,
			.storagebits = 16,
			.endianness = IIO_LE,
		},
		.scan_index = GP2AP020A00F_SCAN_MODE_PROXIMITY,
		.address = GP2AP020A00F_D2_L_REG,
		.event_spec = gp2ap020a00f_event_spec_prox,
		.num_event_specs = ARRAY_SIZE(gp2ap020a00f_event_spec_prox),
	},
	IIO_CHAN_SOFT_TIMESTAMP(GP2AP020A00F_CHAN_TIMESTAMP),
};

static const struct iio_info gp2ap020a00f_info = {
	.read_raw = &gp2ap020a00f_read_raw,
	.read_event_value = &gp2ap020a00f_read_event_val,
	.read_event_config = &gp2ap020a00f_read_event_config,
	.write_event_value = &gp2ap020a00f_write_event_val,
	.write_event_config = &gp2ap020a00f_write_event_config,
	.driver_module = THIS_MODULE,
};

static int gp2ap020a00f_buffer_postenable(struct iio_dev *indio_dev)
{
	struct gp2ap020a00f_data *data = iio_priv(indio_dev);
	int i, err = 0;

	mutex_lock(&data->lock);

	/*
	 * Enable triggers according to the scan_mask. Enabling either
	 * LIGHT_CLEAR or LIGHT_IR scan mode results in enabling ALS
	 * module in the device, which generates samples in both D0 (clear)
	 * and D1 (ir) registers. As the two registers are bound to the
	 * two separate IIO channels they are treated in the driver logic
	 * as if they were controlled independently.
	 */
	for_each_set_bit(i, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		switch (i) {
		case GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR:
			err = gp2ap020a00f_exec_cmd(data,
					GP2AP020A00F_CMD_TRIGGER_CLEAR_EN);
			break;
		case GP2AP020A00F_SCAN_MODE_LIGHT_IR:
			err = gp2ap020a00f_exec_cmd(data,
					GP2AP020A00F_CMD_TRIGGER_IR_EN);
			break;
		case GP2AP020A00F_SCAN_MODE_PROXIMITY:
			err = gp2ap020a00f_exec_cmd(data,
					GP2AP020A00F_CMD_TRIGGER_PROX_EN);
			break;
		}
	}

	if (err < 0)
		goto error_unlock;

	data->buffer = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
	if (!data->buffer) {
		err = -ENOMEM;
		goto error_unlock;
	}

	err = iio_triggered_buffer_postenable(indio_dev);

error_unlock:
	mutex_unlock(&data->lock);

	return err;
}

static int gp2ap020a00f_buffer_predisable(struct iio_dev *indio_dev)
{
	struct gp2ap020a00f_data *data = iio_priv(indio_dev);
	int i, err;

	mutex_lock(&data->lock);

	err = iio_triggered_buffer_predisable(indio_dev);
	if (err < 0)
		goto error_unlock;

	for_each_set_bit(i, indio_dev->active_scan_mask,
		indio_dev->masklength) {
		switch (i) {
		case GP2AP020A00F_SCAN_MODE_LIGHT_CLEAR:
			err = gp2ap020a00f_exec_cmd(data,
					GP2AP020A00F_CMD_TRIGGER_CLEAR_DIS);
			break;
		case GP2AP020A00F_SCAN_MODE_LIGHT_IR:
			err = gp2ap020a00f_exec_cmd(data,
					GP2AP020A00F_CMD_TRIGGER_IR_DIS);
			break;
		case GP2AP020A00F_SCAN_MODE_PROXIMITY:
			err = gp2ap020a00f_exec_cmd(data,
					GP2AP020A00F_CMD_TRIGGER_PROX_DIS);
			break;
		}
	}

	if (err == 0)
		kfree(data->buffer);

error_unlock:
	mutex_unlock(&data->lock);

	return err;
}

static const struct iio_buffer_setup_ops gp2ap020a00f_buffer_setup_ops = {
	.postenable = &gp2ap020a00f_buffer_postenable,
	.predisable = &gp2ap020a00f_buffer_predisable,
};

static const struct iio_trigger_ops gp2ap020a00f_trigger_ops = {
	.owner = THIS_MODULE,
};

static int gp2ap020a00f_probe(struct i2c_client *client,
				const struct i2c_device_id *id)
{
	struct gp2ap020a00f_data *data;
	struct iio_dev *indio_dev;
	struct regmap *regmap;
	int err;

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

	data = iio_priv(indio_dev);

	data->vled_reg = devm_regulator_get(&client->dev, "vled");
	if (IS_ERR(data->vled_reg))
		return PTR_ERR(data->vled_reg);

	err = regulator_enable(data->vled_reg);
	if (err)
		return err;

	regmap = devm_regmap_init_i2c(client, &gp2ap020a00f_regmap_config);
	if (IS_ERR(regmap)) {
		dev_err(&client->dev, "Regmap initialization failed.\n");
		err = PTR_ERR(regmap);
		goto error_regulator_disable;
	}

	/* Initialize device registers */
	err = regmap_bulk_write(regmap, GP2AP020A00F_OP_REG,
			gp2ap020a00f_reg_init_tab,
			ARRAY_SIZE(gp2ap020a00f_reg_init_tab));

	if (err < 0) {
		dev_err(&client->dev, "Device initialization failed.\n");
		goto error_regulator_disable;
	}

	i2c_set_clientdata(client, indio_dev);

	data->client = client;
	data->cur_opmode = GP2AP020A00F_OPMODE_SHUTDOWN;
	data->regmap = regmap;
	init_waitqueue_head(&data->data_ready_queue);

	mutex_init(&data->lock);
	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = gp2ap020a00f_channels;
	indio_dev->num_channels = ARRAY_SIZE(gp2ap020a00f_channels);
	indio_dev->info = &gp2ap020a00f_info;
	indio_dev->name = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;

	/* Allocate buffer */
	err = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
		&gp2ap020a00f_trigger_handler, &gp2ap020a00f_buffer_setup_ops);
	if (err < 0)
		goto error_regulator_disable;

	/* Allocate trigger */
	data->trig = devm_iio_trigger_alloc(&client->dev, "%s-trigger",
							indio_dev->name);
	if (data->trig == NULL) {
		err = -ENOMEM;
		dev_err(&indio_dev->dev, "Failed to allocate iio trigger.\n");
		goto error_uninit_buffer;
	}

	/* This needs to be requested here for read_raw calls to work. */
	err = request_threaded_irq(client->irq, NULL,
				   &gp2ap020a00f_thresh_event_handler,
				   IRQF_TRIGGER_FALLING |
				   IRQF_ONESHOT,
				   "gp2ap020a00f_als_event",
				   indio_dev);
	if (err < 0) {
		dev_err(&client->dev, "Irq request failed.\n");
		goto error_uninit_buffer;
	}

	data->trig->ops = &gp2ap020a00f_trigger_ops;
	data->trig->dev.parent = &data->client->dev;

	init_irq_work(&data->work, gp2ap020a00f_iio_trigger_work);

	err = iio_trigger_register(data->trig);
	if (err < 0) {
		dev_err(&client->dev, "Failed to register iio trigger.\n");
		goto error_free_irq;
	}

	err = iio_device_register(indio_dev);
	if (err < 0)
		goto error_trigger_unregister;

	return 0;

error_trigger_unregister:
	iio_trigger_unregister(data->trig);
error_free_irq:
	free_irq(client->irq, indio_dev);
error_uninit_buffer:
	iio_triggered_buffer_cleanup(indio_dev);
error_regulator_disable:
	regulator_disable(data->vled_reg);

	return err;
}

static int gp2ap020a00f_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct gp2ap020a00f_data *data = iio_priv(indio_dev);
	int err;

	err = gp2ap020a00f_set_operation_mode(data,
					GP2AP020A00F_OPMODE_SHUTDOWN);
	if (err < 0)
		dev_err(&indio_dev->dev, "Failed to power off the device.\n");

	iio_device_unregister(indio_dev);
	iio_trigger_unregister(data->trig);
	free_irq(client->irq, indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	regulator_disable(data->vled_reg);

	return 0;
}

static const struct i2c_device_id gp2ap020a00f_id[] = {
	{ GP2A_I2C_NAME, 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, gp2ap020a00f_id);

#ifdef CONFIG_OF
static const struct of_device_id gp2ap020a00f_of_match[] = {
	{ .compatible = "sharp,gp2ap020a00f" },
	{ }
};
#endif

static struct i2c_driver gp2ap020a00f_driver = {
	.driver = {
		.name	= GP2A_I2C_NAME,
		.of_match_table = of_match_ptr(gp2ap020a00f_of_match),
		.owner	= THIS_MODULE,
	},
	.probe		= gp2ap020a00f_probe,
	.remove		= gp2ap020a00f_remove,
	.id_table	= gp2ap020a00f_id,
};

module_i2c_driver(gp2ap020a00f_driver);

MODULE_AUTHOR("Jacek Anaszewski <j.anaszewski@samsung.com>");
MODULE_DESCRIPTION("Sharp GP2AP020A00F Proximity/ALS sensor driver");
MODULE_LICENSE("GPL v2");