summaryrefslogtreecommitdiffstats
path: root/drivers/power/supply/bq25890_charger.c
blob: ee6e28f1d52dc573b97ddfe2e3204f6278c36d0f (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * TI BQ25890 charger driver
 *
 * Copyright (C) 2015 Intel Corporation
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/power_supply.h>
#include <linux/power/bq25890_charger.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>
#include <linux/types.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/usb/phy.h>

#include <linux/acpi.h>
#include <linux/of.h>

#define BQ25890_MANUFACTURER		"Texas Instruments"
#define BQ25890_IRQ_PIN			"bq25890_irq"

#define BQ25890_ID			3
#define BQ25895_ID			7
#define BQ25896_ID			0

#define PUMP_EXPRESS_START_DELAY	(5 * HZ)
#define PUMP_EXPRESS_MAX_TRIES		6
#define PUMP_EXPRESS_VBUS_MARGIN_uV	1000000

enum bq25890_chip_version {
	BQ25890,
	BQ25892,
	BQ25895,
	BQ25896,
};

static const char *const bq25890_chip_name[] = {
	"BQ25890",
	"BQ25892",
	"BQ25895",
	"BQ25896",
};

enum bq25890_fields {
	F_EN_HIZ, F_EN_ILIM, F_IINLIM,				     /* Reg00 */
	F_BHOT, F_BCOLD, F_VINDPM_OFS,				     /* Reg01 */
	F_CONV_START, F_CONV_RATE, F_BOOSTF, F_ICO_EN,
	F_HVDCP_EN, F_MAXC_EN, F_FORCE_DPM, F_AUTO_DPDM_EN,	     /* Reg02 */
	F_BAT_LOAD_EN, F_WD_RST, F_OTG_CFG, F_CHG_CFG, F_SYSVMIN,
	F_MIN_VBAT_SEL,						     /* Reg03 */
	F_PUMPX_EN, F_ICHG,					     /* Reg04 */
	F_IPRECHG, F_ITERM,					     /* Reg05 */
	F_VREG, F_BATLOWV, F_VRECHG,				     /* Reg06 */
	F_TERM_EN, F_STAT_DIS, F_WD, F_TMR_EN, F_CHG_TMR,
	F_JEITA_ISET,						     /* Reg07 */
	F_BATCMP, F_VCLAMP, F_TREG,				     /* Reg08 */
	F_FORCE_ICO, F_TMR2X_EN, F_BATFET_DIS, F_JEITA_VSET,
	F_BATFET_DLY, F_BATFET_RST_EN, F_PUMPX_UP, F_PUMPX_DN,	     /* Reg09 */
	F_BOOSTV, F_PFM_OTG_DIS, F_BOOSTI,			     /* Reg0A */
	F_VBUS_STAT, F_CHG_STAT, F_PG_STAT, F_SDP_STAT, F_0B_RSVD,
	F_VSYS_STAT,						     /* Reg0B */
	F_WD_FAULT, F_BOOST_FAULT, F_CHG_FAULT, F_BAT_FAULT,
	F_NTC_FAULT,						     /* Reg0C */
	F_FORCE_VINDPM, F_VINDPM,				     /* Reg0D */
	F_THERM_STAT, F_BATV,					     /* Reg0E */
	F_SYSV,							     /* Reg0F */
	F_TSPCT,						     /* Reg10 */
	F_VBUS_GD, F_VBUSV,					     /* Reg11 */
	F_ICHGR,						     /* Reg12 */
	F_VDPM_STAT, F_IDPM_STAT, F_IDPM_LIM,			     /* Reg13 */
	F_REG_RST, F_ICO_OPTIMIZED, F_PN, F_TS_PROFILE, F_DEV_REV,   /* Reg14 */

	F_MAX_FIELDS
};

/* initial field values, converted to register values */
struct bq25890_init_data {
	u8 ichg;	/* charge current		*/
	u8 vreg;	/* regulation voltage		*/
	u8 iterm;	/* termination current		*/
	u8 iprechg;	/* precharge current		*/
	u8 sysvmin;	/* minimum system voltage limit */
	u8 boostv;	/* boost regulation voltage	*/
	u8 boosti;	/* boost current limit		*/
	u8 boostf;	/* boost frequency		*/
	u8 ilim_en;	/* enable ILIM pin		*/
	u8 treg;	/* thermal regulation threshold */
	u8 rbatcomp;	/* IBAT sense resistor value    */
	u8 vclamp;	/* IBAT compensation voltage limit */
};

struct bq25890_state {
	u8 online;
	u8 chrg_status;
	u8 chrg_fault;
	u8 vsys_status;
	u8 boost_fault;
	u8 bat_fault;
	u8 ntc_fault;
};

struct bq25890_device {
	struct i2c_client *client;
	struct device *dev;
	struct power_supply *charger;

	struct usb_phy *usb_phy;
	struct notifier_block usb_nb;
	struct work_struct usb_work;
	struct delayed_work pump_express_work;
	unsigned long usb_event;

	struct regmap *rmap;
	struct regmap_field *rmap_fields[F_MAX_FIELDS];

	bool skip_reset;
	bool read_back_init_data;
	u32 pump_express_vbus_max;
	enum bq25890_chip_version chip_version;
	struct bq25890_init_data init_data;
	struct bq25890_state state;

	struct mutex lock; /* protect state data */
};

static const struct regmap_range bq25890_readonly_reg_ranges[] = {
	regmap_reg_range(0x0b, 0x0c),
	regmap_reg_range(0x0e, 0x13),
};

static const struct regmap_access_table bq25890_writeable_regs = {
	.no_ranges = bq25890_readonly_reg_ranges,
	.n_no_ranges = ARRAY_SIZE(bq25890_readonly_reg_ranges),
};

static const struct regmap_range bq25890_volatile_reg_ranges[] = {
	regmap_reg_range(0x00, 0x00),
	regmap_reg_range(0x02, 0x02),
	regmap_reg_range(0x09, 0x09),
	regmap_reg_range(0x0b, 0x14),
};

static const struct regmap_access_table bq25890_volatile_regs = {
	.yes_ranges = bq25890_volatile_reg_ranges,
	.n_yes_ranges = ARRAY_SIZE(bq25890_volatile_reg_ranges),
};

static const struct regmap_config bq25890_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,

	.max_register = 0x14,
	.cache_type = REGCACHE_RBTREE,

	.wr_table = &bq25890_writeable_regs,
	.volatile_table = &bq25890_volatile_regs,
};

static const struct reg_field bq25890_reg_fields[] = {
	/* REG00 */
	[F_EN_HIZ]		= REG_FIELD(0x00, 7, 7),
	[F_EN_ILIM]		= REG_FIELD(0x00, 6, 6),
	[F_IINLIM]		= REG_FIELD(0x00, 0, 5),
	/* REG01 */
	[F_BHOT]		= REG_FIELD(0x01, 6, 7),
	[F_BCOLD]		= REG_FIELD(0x01, 5, 5),
	[F_VINDPM_OFS]		= REG_FIELD(0x01, 0, 4),
	/* REG02 */
	[F_CONV_START]		= REG_FIELD(0x02, 7, 7),
	[F_CONV_RATE]		= REG_FIELD(0x02, 6, 6),
	[F_BOOSTF]		= REG_FIELD(0x02, 5, 5),
	[F_ICO_EN]		= REG_FIELD(0x02, 4, 4),
	[F_HVDCP_EN]		= REG_FIELD(0x02, 3, 3),  // reserved on BQ25896
	[F_MAXC_EN]		= REG_FIELD(0x02, 2, 2),  // reserved on BQ25896
	[F_FORCE_DPM]		= REG_FIELD(0x02, 1, 1),
	[F_AUTO_DPDM_EN]	= REG_FIELD(0x02, 0, 0),
	/* REG03 */
	[F_BAT_LOAD_EN]		= REG_FIELD(0x03, 7, 7),
	[F_WD_RST]		= REG_FIELD(0x03, 6, 6),
	[F_OTG_CFG]		= REG_FIELD(0x03, 5, 5),
	[F_CHG_CFG]		= REG_FIELD(0x03, 4, 4),
	[F_SYSVMIN]		= REG_FIELD(0x03, 1, 3),
	[F_MIN_VBAT_SEL]	= REG_FIELD(0x03, 0, 0), // BQ25896 only
	/* REG04 */
	[F_PUMPX_EN]		= REG_FIELD(0x04, 7, 7),
	[F_ICHG]		= REG_FIELD(0x04, 0, 6),
	/* REG05 */
	[F_IPRECHG]		= REG_FIELD(0x05, 4, 7),
	[F_ITERM]		= REG_FIELD(0x05, 0, 3),
	/* REG06 */
	[F_VREG]		= REG_FIELD(0x06, 2, 7),
	[F_BATLOWV]		= REG_FIELD(0x06, 1, 1),
	[F_VRECHG]		= REG_FIELD(0x06, 0, 0),
	/* REG07 */
	[F_TERM_EN]		= REG_FIELD(0x07, 7, 7),
	[F_STAT_DIS]		= REG_FIELD(0x07, 6, 6),
	[F_WD]			= REG_FIELD(0x07, 4, 5),
	[F_TMR_EN]		= REG_FIELD(0x07, 3, 3),
	[F_CHG_TMR]		= REG_FIELD(0x07, 1, 2),
	[F_JEITA_ISET]		= REG_FIELD(0x07, 0, 0), // reserved on BQ25895
	/* REG08 */
	[F_BATCMP]		= REG_FIELD(0x08, 5, 7),
	[F_VCLAMP]		= REG_FIELD(0x08, 2, 4),
	[F_TREG]		= REG_FIELD(0x08, 0, 1),
	/* REG09 */
	[F_FORCE_ICO]		= REG_FIELD(0x09, 7, 7),
	[F_TMR2X_EN]		= REG_FIELD(0x09, 6, 6),
	[F_BATFET_DIS]		= REG_FIELD(0x09, 5, 5),
	[F_JEITA_VSET]		= REG_FIELD(0x09, 4, 4), // reserved on BQ25895
	[F_BATFET_DLY]		= REG_FIELD(0x09, 3, 3),
	[F_BATFET_RST_EN]	= REG_FIELD(0x09, 2, 2),
	[F_PUMPX_UP]		= REG_FIELD(0x09, 1, 1),
	[F_PUMPX_DN]		= REG_FIELD(0x09, 0, 0),
	/* REG0A */
	[F_BOOSTV]		= REG_FIELD(0x0A, 4, 7),
	[F_BOOSTI]		= REG_FIELD(0x0A, 0, 2), // reserved on BQ25895
	[F_PFM_OTG_DIS]		= REG_FIELD(0x0A, 3, 3), // BQ25896 only
	/* REG0B */
	[F_VBUS_STAT]		= REG_FIELD(0x0B, 5, 7),
	[F_CHG_STAT]		= REG_FIELD(0x0B, 3, 4),
	[F_PG_STAT]		= REG_FIELD(0x0B, 2, 2),
	[F_SDP_STAT]		= REG_FIELD(0x0B, 1, 1), // reserved on BQ25896
	[F_VSYS_STAT]		= REG_FIELD(0x0B, 0, 0),
	/* REG0C */
	[F_WD_FAULT]		= REG_FIELD(0x0C, 7, 7),
	[F_BOOST_FAULT]		= REG_FIELD(0x0C, 6, 6),
	[F_CHG_FAULT]		= REG_FIELD(0x0C, 4, 5),
	[F_BAT_FAULT]		= REG_FIELD(0x0C, 3, 3),
	[F_NTC_FAULT]		= REG_FIELD(0x0C, 0, 2),
	/* REG0D */
	[F_FORCE_VINDPM]	= REG_FIELD(0x0D, 7, 7),
	[F_VINDPM]		= REG_FIELD(0x0D, 0, 6),
	/* REG0E */
	[F_THERM_STAT]		= REG_FIELD(0x0E, 7, 7),
	[F_BATV]		= REG_FIELD(0x0E, 0, 6),
	/* REG0F */
	[F_SYSV]		= REG_FIELD(0x0F, 0, 6),
	/* REG10 */
	[F_TSPCT]		= REG_FIELD(0x10, 0, 6),
	/* REG11 */
	[F_VBUS_GD]		= REG_FIELD(0x11, 7, 7),
	[F_VBUSV]		= REG_FIELD(0x11, 0, 6),
	/* REG12 */
	[F_ICHGR]		= REG_FIELD(0x12, 0, 6),
	/* REG13 */
	[F_VDPM_STAT]		= REG_FIELD(0x13, 7, 7),
	[F_IDPM_STAT]		= REG_FIELD(0x13, 6, 6),
	[F_IDPM_LIM]		= REG_FIELD(0x13, 0, 5),
	/* REG14 */
	[F_REG_RST]		= REG_FIELD(0x14, 7, 7),
	[F_ICO_OPTIMIZED]	= REG_FIELD(0x14, 6, 6),
	[F_PN]			= REG_FIELD(0x14, 3, 5),
	[F_TS_PROFILE]		= REG_FIELD(0x14, 2, 2),
	[F_DEV_REV]		= REG_FIELD(0x14, 0, 1)
};

/*
 * Most of the val -> idx conversions can be computed, given the minimum,
 * maximum and the step between values. For the rest of conversions, we use
 * lookup tables.
 */
enum bq25890_table_ids {
	/* range tables */
	TBL_ICHG,
	TBL_ITERM,
	TBL_IINLIM,
	TBL_VREG,
	TBL_BOOSTV,
	TBL_SYSVMIN,
	TBL_VBUSV,
	TBL_VBATCOMP,
	TBL_RBATCOMP,

	/* lookup tables */
	TBL_TREG,
	TBL_BOOSTI,
	TBL_TSPCT,
};

/* Thermal Regulation Threshold lookup table, in degrees Celsius */
static const u32 bq25890_treg_tbl[] = { 60, 80, 100, 120 };

#define BQ25890_TREG_TBL_SIZE		ARRAY_SIZE(bq25890_treg_tbl)

/* Boost mode current limit lookup table, in uA */
static const u32 bq25890_boosti_tbl[] = {
	500000, 700000, 1100000, 1300000, 1600000, 1800000, 2100000, 2400000
};

#define BQ25890_BOOSTI_TBL_SIZE		ARRAY_SIZE(bq25890_boosti_tbl)

/* NTC 10K temperature lookup table in tenths of a degree */
static const u32 bq25890_tspct_tbl[] = {
	850, 840, 830, 820, 810, 800, 790, 780,
	770, 760, 750, 740, 730, 720, 710, 700,
	690, 685, 680, 675, 670, 660, 650, 645,
	640, 630, 620, 615, 610, 600, 590, 585,
	580, 570, 565, 560, 550, 540, 535, 530,
	520, 515, 510, 500, 495, 490, 480, 475,
	470, 460, 455, 450, 440, 435, 430, 425,
	420, 410, 405, 400, 390, 385, 380, 370,
	365, 360, 355, 350, 340, 335, 330, 320,
	310, 305, 300, 290, 285, 280, 275, 270,
	260, 250, 245, 240, 230, 225, 220, 210,
	205, 200, 190, 180, 175, 170, 160, 150,
	145, 140, 130, 120, 115, 110, 100, 90,
	80, 70, 60, 50, 40, 30, 20, 10,
	0, -10, -20, -30, -40, -60, -70, -80,
	-90, -10, -120, -140, -150, -170, -190, -210,
};

#define BQ25890_TSPCT_TBL_SIZE		ARRAY_SIZE(bq25890_tspct_tbl)

struct bq25890_range {
	u32 min;
	u32 max;
	u32 step;
};

struct bq25890_lookup {
	const u32 *tbl;
	u32 size;
};

static const union {
	struct bq25890_range  rt;
	struct bq25890_lookup lt;
} bq25890_tables[] = {
	/* range tables */
	/* TODO: BQ25896 has max ICHG 3008 mA */
	[TBL_ICHG] =	 { .rt = {0,        5056000, 64000} },	 /* uA */
	[TBL_ITERM] =	 { .rt = {64000,    1024000, 64000} },	 /* uA */
	[TBL_IINLIM] =   { .rt = {100000,   3250000, 50000} },	 /* uA */
	[TBL_VREG] =	 { .rt = {3840000,  4608000, 16000} },	 /* uV */
	[TBL_BOOSTV] =	 { .rt = {4550000,  5510000, 64000} },	 /* uV */
	[TBL_SYSVMIN] =  { .rt = {3000000,  3700000, 100000} },	 /* uV */
	[TBL_VBUSV] =	 { .rt = {2600000, 15300000, 100000} },	 /* uV */
	[TBL_VBATCOMP] = { .rt = {0,         224000, 32000} },	 /* uV */
	[TBL_RBATCOMP] = { .rt = {0,         140000, 20000} },	 /* uOhm */

	/* lookup tables */
	[TBL_TREG] =	{ .lt = {bq25890_treg_tbl, BQ25890_TREG_TBL_SIZE} },
	[TBL_BOOSTI] =	{ .lt = {bq25890_boosti_tbl, BQ25890_BOOSTI_TBL_SIZE} },
	[TBL_TSPCT] =	{ .lt = {bq25890_tspct_tbl, BQ25890_TSPCT_TBL_SIZE} }
};

static int bq25890_field_read(struct bq25890_device *bq,
			      enum bq25890_fields field_id)
{
	int ret;
	int val;

	ret = regmap_field_read(bq->rmap_fields[field_id], &val);
	if (ret < 0)
		return ret;

	return val;
}

static int bq25890_field_write(struct bq25890_device *bq,
			       enum bq25890_fields field_id, u8 val)
{
	return regmap_field_write(bq->rmap_fields[field_id], val);
}

static u8 bq25890_find_idx(u32 value, enum bq25890_table_ids id)
{
	u8 idx;

	if (id >= TBL_TREG) {
		const u32 *tbl = bq25890_tables[id].lt.tbl;
		u32 tbl_size = bq25890_tables[id].lt.size;

		for (idx = 1; idx < tbl_size && tbl[idx] <= value; idx++)
			;
	} else {
		const struct bq25890_range *rtbl = &bq25890_tables[id].rt;
		u8 rtbl_size;

		rtbl_size = (rtbl->max - rtbl->min) / rtbl->step + 1;

		for (idx = 1;
		     idx < rtbl_size && (idx * rtbl->step + rtbl->min <= value);
		     idx++)
			;
	}

	return idx - 1;
}

static u32 bq25890_find_val(u8 idx, enum bq25890_table_ids id)
{
	const struct bq25890_range *rtbl;

	/* lookup table? */
	if (id >= TBL_TREG)
		return bq25890_tables[id].lt.tbl[idx];

	/* range table */
	rtbl = &bq25890_tables[id].rt;

	return (rtbl->min + idx * rtbl->step);
}

enum bq25890_status {
	STATUS_NOT_CHARGING,
	STATUS_PRE_CHARGING,
	STATUS_FAST_CHARGING,
	STATUS_TERMINATION_DONE,
};

enum bq25890_chrg_fault {
	CHRG_FAULT_NORMAL,
	CHRG_FAULT_INPUT,
	CHRG_FAULT_THERMAL_SHUTDOWN,
	CHRG_FAULT_TIMER_EXPIRED,
};

enum bq25890_ntc_fault {
	NTC_FAULT_NORMAL = 0,
	NTC_FAULT_WARM = 2,
	NTC_FAULT_COOL = 3,
	NTC_FAULT_COLD = 5,
	NTC_FAULT_HOT = 6,
};

static bool bq25890_is_adc_property(enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	case POWER_SUPPLY_PROP_TEMP:
		return true;

	default:
		return false;
	}
}

static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq);

static int bq25890_get_vbus_voltage(struct bq25890_device *bq)
{
	int ret;

	ret = bq25890_field_read(bq, F_VBUSV);
	if (ret < 0)
		return ret;

	return bq25890_find_val(ret, TBL_VBUSV);
}

static int bq25890_power_supply_get_property(struct power_supply *psy,
					     enum power_supply_property psp,
					     union power_supply_propval *val)
{
	struct bq25890_device *bq = power_supply_get_drvdata(psy);
	struct bq25890_state state;
	bool do_adc_conv;
	int ret;

	mutex_lock(&bq->lock);
	/* update state in case we lost an interrupt */
	__bq25890_handle_irq(bq);
	state = bq->state;
	do_adc_conv = !state.online && bq25890_is_adc_property(psp);
	if (do_adc_conv)
		bq25890_field_write(bq, F_CONV_START, 1);
	mutex_unlock(&bq->lock);

	if (do_adc_conv)
		regmap_field_read_poll_timeout(bq->rmap_fields[F_CONV_START],
			ret, !ret, 25000, 1000000);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (!state.online)
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
		else if (state.chrg_status == STATUS_NOT_CHARGING)
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
		else if (state.chrg_status == STATUS_PRE_CHARGING ||
			 state.chrg_status == STATUS_FAST_CHARGING)
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
		else if (state.chrg_status == STATUS_TERMINATION_DONE)
			val->intval = POWER_SUPPLY_STATUS_FULL;
		else
			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;

		break;

	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		if (!state.online || state.chrg_status == STATUS_NOT_CHARGING ||
		    state.chrg_status == STATUS_TERMINATION_DONE)
			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
		else if (state.chrg_status == STATUS_PRE_CHARGING)
			val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
		else if (state.chrg_status == STATUS_FAST_CHARGING)
			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
		else /* unreachable */
			val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
		break;

	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = BQ25890_MANUFACTURER;
		break;

	case POWER_SUPPLY_PROP_MODEL_NAME:
		val->strval = bq25890_chip_name[bq->chip_version];
		break;

	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = state.online;
		break;

	case POWER_SUPPLY_PROP_HEALTH:
		if (!state.chrg_fault && !state.bat_fault && !state.boost_fault)
			val->intval = POWER_SUPPLY_HEALTH_GOOD;
		else if (state.bat_fault)
			val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		else if (state.chrg_fault == CHRG_FAULT_TIMER_EXPIRED)
			val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
		else if (state.chrg_fault == CHRG_FAULT_THERMAL_SHUTDOWN)
			val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
		else
			val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
		val->intval = bq25890_find_val(bq->init_data.ichg, TBL_ICHG);

		/* When temperature is too low, charge current is decreased */
		if (bq->state.ntc_fault == NTC_FAULT_COOL) {
			ret = bq25890_field_read(bq, F_JEITA_ISET);
			if (ret < 0)
				return ret;

			if (ret)
				val->intval /= 5;
			else
				val->intval /= 2;
		}
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
		if (!state.online) {
			val->intval = 0;
			break;
		}

		ret = bq25890_field_read(bq, F_BATV); /* read measured value */
		if (ret < 0)
			return ret;

		/* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
		val->intval = 2304000 + ret * 20000;
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
		val->intval = bq25890_find_val(bq->init_data.vreg, TBL_VREG);
		break;

	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
		val->intval = bq25890_find_val(bq->init_data.iprechg, TBL_ITERM);
		break;

	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
		val->intval = bq25890_find_val(bq->init_data.iterm, TBL_ITERM);
		break;

	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		ret = bq25890_field_read(bq, F_IINLIM);
		if (ret < 0)
			return ret;

		val->intval = bq25890_find_val(ret, TBL_IINLIM);
		break;

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = bq25890_field_read(bq, F_SYSV); /* read measured value */
		if (ret < 0)
			return ret;

		/* converted_val = 2.304V + ADC_val * 20mV (table 10.3.15) */
		val->intval = 2304000 + ret * 20000;
		break;

	case POWER_SUPPLY_PROP_CURRENT_NOW:
		ret = bq25890_field_read(bq, F_ICHGR); /* read measured value */
		if (ret < 0)
			return ret;

		/* converted_val = ADC_val * 50mA (table 10.3.19) */
		val->intval = ret * -50000;
		break;

	case POWER_SUPPLY_PROP_TEMP:
		ret = bq25890_field_read(bq, F_TSPCT);
		if (ret < 0)
			return ret;

		/* convert TS percentage into rough temperature */
		val->intval = bq25890_find_val(ret, TBL_TSPCT);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int bq25890_power_supply_set_property(struct power_supply *psy,
					     enum power_supply_property psp,
					     const union power_supply_propval *val)
{
	struct bq25890_device *bq = power_supply_get_drvdata(psy);
	u8 lval;

	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		lval = bq25890_find_idx(val->intval, TBL_IINLIM);
		return bq25890_field_write(bq, F_IINLIM, lval);
	default:
		return -EINVAL;
	}
}

static int bq25890_power_supply_property_is_writeable(struct power_supply *psy,
						      enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
		return true;
	default:
		return false;
	}
}

/* On the BQ25892 try to get charger-type info from our supplier */
static void bq25890_charger_external_power_changed(struct power_supply *psy)
{
	struct bq25890_device *bq = power_supply_get_drvdata(psy);
	union power_supply_propval val;
	int input_current_limit, ret;

	if (bq->chip_version != BQ25892)
		return;

	ret = power_supply_get_property_from_supplier(psy,
						      POWER_SUPPLY_PROP_USB_TYPE,
						      &val);
	if (ret)
		return;

	switch (val.intval) {
	case POWER_SUPPLY_USB_TYPE_DCP:
		input_current_limit = bq25890_find_idx(2000000, TBL_IINLIM);
		if (bq->pump_express_vbus_max) {
			queue_delayed_work(system_power_efficient_wq,
					   &bq->pump_express_work,
					   PUMP_EXPRESS_START_DELAY);
		}
		break;
	case POWER_SUPPLY_USB_TYPE_CDP:
	case POWER_SUPPLY_USB_TYPE_ACA:
		input_current_limit = bq25890_find_idx(1500000, TBL_IINLIM);
		break;
	case POWER_SUPPLY_USB_TYPE_SDP:
	default:
		input_current_limit = bq25890_find_idx(500000, TBL_IINLIM);
	}

	bq25890_field_write(bq, F_IINLIM, input_current_limit);
	power_supply_changed(psy);
}

static int bq25890_get_chip_state(struct bq25890_device *bq,
				  struct bq25890_state *state)
{
	int i, ret;

	struct {
		enum bq25890_fields id;
		u8 *data;
	} state_fields[] = {
		{F_CHG_STAT,	&state->chrg_status},
		{F_PG_STAT,	&state->online},
		{F_VSYS_STAT,	&state->vsys_status},
		{F_BOOST_FAULT, &state->boost_fault},
		{F_BAT_FAULT,	&state->bat_fault},
		{F_CHG_FAULT,	&state->chrg_fault},
		{F_NTC_FAULT,	&state->ntc_fault}
	};

	for (i = 0; i < ARRAY_SIZE(state_fields); i++) {
		ret = bq25890_field_read(bq, state_fields[i].id);
		if (ret < 0)
			return ret;

		*state_fields[i].data = ret;
	}

	dev_dbg(bq->dev, "S:CHG/PG/VSYS=%d/%d/%d, F:CHG/BOOST/BAT/NTC=%d/%d/%d/%d\n",
		state->chrg_status, state->online, state->vsys_status,
		state->chrg_fault, state->boost_fault, state->bat_fault,
		state->ntc_fault);

	return 0;
}

static irqreturn_t __bq25890_handle_irq(struct bq25890_device *bq)
{
	struct bq25890_state new_state;
	int ret;

	ret = bq25890_get_chip_state(bq, &new_state);
	if (ret < 0)
		return IRQ_NONE;

	if (!memcmp(&bq->state, &new_state, sizeof(new_state)))
		return IRQ_NONE;

	if (!new_state.online && bq->state.online) {	    /* power removed */
		/* disable ADC */
		ret = bq25890_field_write(bq, F_CONV_RATE, 0);
		if (ret < 0)
			goto error;
	} else if (new_state.online && !bq->state.online) { /* power inserted */
		/* enable ADC, to have control of charge current/voltage */
		ret = bq25890_field_write(bq, F_CONV_RATE, 1);
		if (ret < 0)
			goto error;
	}

	bq->state = new_state;
	power_supply_changed(bq->charger);

	return IRQ_HANDLED;
error:
	dev_err(bq->dev, "Error communicating with the chip: %pe\n",
		ERR_PTR(ret));
	return IRQ_HANDLED;
}

static irqreturn_t bq25890_irq_handler_thread(int irq, void *private)
{
	struct bq25890_device *bq = private;
	irqreturn_t ret;

	mutex_lock(&bq->lock);
	ret = __bq25890_handle_irq(bq);
	mutex_unlock(&bq->lock);

	return ret;
}

static int bq25890_chip_reset(struct bq25890_device *bq)
{
	int ret;
	int rst_check_counter = 10;

	ret = bq25890_field_write(bq, F_REG_RST, 1);
	if (ret < 0)
		return ret;

	do {
		ret = bq25890_field_read(bq, F_REG_RST);
		if (ret < 0)
			return ret;

		usleep_range(5, 10);
	} while (ret == 1 && --rst_check_counter);

	if (!rst_check_counter)
		return -ETIMEDOUT;

	return 0;
}

static int bq25890_rw_init_data(struct bq25890_device *bq)
{
	bool write = !bq->read_back_init_data;
	int ret;
	int i;

	const struct {
		enum bq25890_fields id;
		u8 *value;
	} init_data[] = {
		{F_ICHG,	 &bq->init_data.ichg},
		{F_VREG,	 &bq->init_data.vreg},
		{F_ITERM,	 &bq->init_data.iterm},
		{F_IPRECHG,	 &bq->init_data.iprechg},
		{F_SYSVMIN,	 &bq->init_data.sysvmin},
		{F_BOOSTV,	 &bq->init_data.boostv},
		{F_BOOSTI,	 &bq->init_data.boosti},
		{F_BOOSTF,	 &bq->init_data.boostf},
		{F_EN_ILIM,	 &bq->init_data.ilim_en},
		{F_TREG,	 &bq->init_data.treg},
		{F_BATCMP,	 &bq->init_data.rbatcomp},
		{F_VCLAMP,	 &bq->init_data.vclamp},
	};

	for (i = 0; i < ARRAY_SIZE(init_data); i++) {
		if (write) {
			ret = bq25890_field_write(bq, init_data[i].id,
						  *init_data[i].value);
		} else {
			ret = bq25890_field_read(bq, init_data[i].id);
			if (ret >= 0)
				*init_data[i].value = ret;
		}
		if (ret < 0) {
			dev_dbg(bq->dev, "Accessing init data failed %d\n", ret);
			return ret;
		}
	}

	return 0;
}

static int bq25890_hw_init(struct bq25890_device *bq)
{
	int ret;

	if (!bq->skip_reset) {
		ret = bq25890_chip_reset(bq);
		if (ret < 0) {
			dev_dbg(bq->dev, "Reset failed %d\n", ret);
			return ret;
		}
	} else {
		/*
		 * Ensure charging is enabled, on some boards where the fw
		 * takes care of initalizition F_CHG_CFG is set to 0 before
		 * handing control over to the OS.
		 */
		ret = bq25890_field_write(bq, F_CHG_CFG, 1);
		if (ret < 0) {
			dev_dbg(bq->dev, "Enabling charging failed %d\n", ret);
			return ret;
		}
	}

	/* disable watchdog */
	ret = bq25890_field_write(bq, F_WD, 0);
	if (ret < 0) {
		dev_dbg(bq->dev, "Disabling watchdog failed %d\n", ret);
		return ret;
	}

	/* initialize currents/voltages and other parameters */
	ret = bq25890_rw_init_data(bq);
	if (ret)
		return ret;

	ret = bq25890_get_chip_state(bq, &bq->state);
	if (ret < 0) {
		dev_dbg(bq->dev, "Get state failed %d\n", ret);
		return ret;
	}

	/* Configure ADC for continuous conversions when charging */
	ret = bq25890_field_write(bq, F_CONV_RATE, !!bq->state.online);
	if (ret < 0) {
		dev_dbg(bq->dev, "Config ADC failed %d\n", ret);
		return ret;
	}

	return 0;
}

static const enum power_supply_property bq25890_power_supply_props[] = {
	POWER_SUPPLY_PROP_MANUFACTURER,
	POWER_SUPPLY_PROP_MODEL_NAME,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_TEMP,
};

static char *bq25890_charger_supplied_to[] = {
	"main-battery",
};

static const struct power_supply_desc bq25890_power_supply_desc = {
	.name = "bq25890-charger",
	.type = POWER_SUPPLY_TYPE_USB,
	.properties = bq25890_power_supply_props,
	.num_properties = ARRAY_SIZE(bq25890_power_supply_props),
	.get_property = bq25890_power_supply_get_property,
	.set_property = bq25890_power_supply_set_property,
	.property_is_writeable = bq25890_power_supply_property_is_writeable,
	.external_power_changed	= bq25890_charger_external_power_changed,
};

static int bq25890_power_supply_init(struct bq25890_device *bq)
{
	struct power_supply_config psy_cfg = { .drv_data = bq, };

	psy_cfg.supplied_to = bq25890_charger_supplied_to;
	psy_cfg.num_supplicants = ARRAY_SIZE(bq25890_charger_supplied_to);

	bq->charger = devm_power_supply_register(bq->dev,
						 &bq25890_power_supply_desc,
						 &psy_cfg);

	return PTR_ERR_OR_ZERO(bq->charger);
}

static int bq25890_set_otg_cfg(struct bq25890_device *bq, u8 val)
{
	int ret;

	ret = bq25890_field_write(bq, F_OTG_CFG, val);
	if (ret < 0)
		dev_err(bq->dev, "Error switching to boost/charger mode: %d\n", ret);

	return ret;
}

static void bq25890_pump_express_work(struct work_struct *data)
{
	struct bq25890_device *bq =
		container_of(data, struct bq25890_device, pump_express_work.work);
	int voltage, i, ret;

	dev_dbg(bq->dev, "Start to request input voltage increasing\n");

	/* Enable current pulse voltage control protocol */
	ret = bq25890_field_write(bq, F_PUMPX_EN, 1);
	if (ret < 0)
		goto error_print;

	for (i = 0; i < PUMP_EXPRESS_MAX_TRIES; i++) {
		voltage = bq25890_get_vbus_voltage(bq);
		if (voltage < 0)
			goto error_print;
		dev_dbg(bq->dev, "input voltage = %d uV\n", voltage);

		if ((voltage + PUMP_EXPRESS_VBUS_MARGIN_uV) >
					bq->pump_express_vbus_max)
			break;

		ret = bq25890_field_write(bq, F_PUMPX_UP, 1);
		if (ret < 0)
			goto error_print;

		/* Note a single PUMPX up pulse-sequence takes 2.1s */
		ret = regmap_field_read_poll_timeout(bq->rmap_fields[F_PUMPX_UP],
						     ret, !ret, 100000, 3000000);
		if (ret < 0)
			goto error_print;

		/* Make sure ADC has sampled Vbus before checking again */
		msleep(1000);
	}

	bq25890_field_write(bq, F_PUMPX_EN, 0);

	dev_info(bq->dev, "Hi-voltage charging requested, input voltage is %d mV\n",
		 voltage);

	power_supply_changed(bq->charger);

	return;
error_print:
	bq25890_field_write(bq, F_PUMPX_EN, 0);
	dev_err(bq->dev, "Failed to request hi-voltage charging\n");
}

static void bq25890_usb_work(struct work_struct *data)
{
	int ret;
	struct bq25890_device *bq =
			container_of(data, struct bq25890_device, usb_work);

	switch (bq->usb_event) {
	case USB_EVENT_ID:
		/* Enable boost mode */
		bq25890_set_otg_cfg(bq, 1);
		break;

	case USB_EVENT_NONE:
		/* Disable boost mode */
		ret = bq25890_set_otg_cfg(bq, 0);
		if (ret == 0)
			power_supply_changed(bq->charger);
		break;
	}
}

static int bq25890_usb_notifier(struct notifier_block *nb, unsigned long val,
				void *priv)
{
	struct bq25890_device *bq =
			container_of(nb, struct bq25890_device, usb_nb);

	bq->usb_event = val;
	queue_work(system_power_efficient_wq, &bq->usb_work);

	return NOTIFY_OK;
}

#ifdef CONFIG_REGULATOR
static int bq25890_vbus_enable(struct regulator_dev *rdev)
{
	struct bq25890_device *bq = rdev_get_drvdata(rdev);

	return bq25890_set_otg_cfg(bq, 1);
}

static int bq25890_vbus_disable(struct regulator_dev *rdev)
{
	struct bq25890_device *bq = rdev_get_drvdata(rdev);

	return bq25890_set_otg_cfg(bq, 0);
}

static int bq25890_vbus_is_enabled(struct regulator_dev *rdev)
{
	struct bq25890_device *bq = rdev_get_drvdata(rdev);

	return bq25890_field_read(bq, F_OTG_CFG);
}

static const struct regulator_ops bq25890_vbus_ops = {
	.enable = bq25890_vbus_enable,
	.disable = bq25890_vbus_disable,
	.is_enabled = bq25890_vbus_is_enabled,
};

static const struct regulator_desc bq25890_vbus_desc = {
	.name = "usb_otg_vbus",
	.of_match = "usb-otg-vbus",
	.type = REGULATOR_VOLTAGE,
	.owner = THIS_MODULE,
	.ops = &bq25890_vbus_ops,
	.fixed_uV = 5000000,
	.n_voltages = 1,
};

static int bq25890_register_regulator(struct bq25890_device *bq)
{
	struct bq25890_platform_data *pdata = dev_get_platdata(bq->dev);
	struct regulator_config cfg = {
		.dev = bq->dev,
		.driver_data = bq,
	};
	struct regulator_dev *reg;

	if (!IS_ERR_OR_NULL(bq->usb_phy))
		return 0;

	if (pdata)
		cfg.init_data = pdata->regulator_init_data;

	reg = devm_regulator_register(bq->dev, &bq25890_vbus_desc, &cfg);
	if (IS_ERR(reg)) {
		return dev_err_probe(bq->dev, PTR_ERR(reg),
				     "registering vbus regulator");
	}

	return 0;
}
#else
static inline int
bq25890_register_regulator(struct bq25890_device *bq)
{
	return 0;
}
#endif

static int bq25890_get_chip_version(struct bq25890_device *bq)
{
	int id, rev;

	id = bq25890_field_read(bq, F_PN);
	if (id < 0) {
		dev_err(bq->dev, "Cannot read chip ID: %d\n", id);
		return id;
	}

	rev = bq25890_field_read(bq, F_DEV_REV);
	if (rev < 0) {
		dev_err(bq->dev, "Cannot read chip revision: %d\n", rev);
		return rev;
	}

	switch (id) {
	case BQ25890_ID:
		bq->chip_version = BQ25890;
		break;

	/* BQ25892 and BQ25896 share same ID 0 */
	case BQ25896_ID:
		switch (rev) {
		case 2:
			bq->chip_version = BQ25896;
			break;
		case 1:
			bq->chip_version = BQ25892;
			break;
		default:
			dev_err(bq->dev,
				"Unknown device revision %d, assume BQ25892\n",
				rev);
			bq->chip_version = BQ25892;
		}
		break;

	case BQ25895_ID:
		bq->chip_version = BQ25895;
		break;

	default:
		dev_err(bq->dev, "Unknown chip ID %d\n", id);
		return -ENODEV;
	}

	return 0;
}

static int bq25890_irq_probe(struct bq25890_device *bq)
{
	struct gpio_desc *irq;

	irq = devm_gpiod_get(bq->dev, BQ25890_IRQ_PIN, GPIOD_IN);
	if (IS_ERR(irq))
		return dev_err_probe(bq->dev, PTR_ERR(irq),
				     "Could not probe irq pin.\n");

	return gpiod_to_irq(irq);
}

static int bq25890_fw_read_u32_props(struct bq25890_device *bq)
{
	int ret;
	u32 property;
	int i;
	struct bq25890_init_data *init = &bq->init_data;
	struct {
		char *name;
		bool optional;
		enum bq25890_table_ids tbl_id;
		u8 *conv_data; /* holds converted value from given property */
	} props[] = {
		/* required properties */
		{"ti,charge-current", false, TBL_ICHG, &init->ichg},
		{"ti,battery-regulation-voltage", false, TBL_VREG, &init->vreg},
		{"ti,termination-current", false, TBL_ITERM, &init->iterm},
		{"ti,precharge-current", false, TBL_ITERM, &init->iprechg},
		{"ti,minimum-sys-voltage", false, TBL_SYSVMIN, &init->sysvmin},
		{"ti,boost-voltage", false, TBL_BOOSTV, &init->boostv},
		{"ti,boost-max-current", false, TBL_BOOSTI, &init->boosti},

		/* optional properties */
		{"ti,thermal-regulation-threshold", true, TBL_TREG, &init->treg},
		{"ti,ibatcomp-micro-ohms", true, TBL_RBATCOMP, &init->rbatcomp},
		{"ti,ibatcomp-clamp-microvolt", true, TBL_VBATCOMP, &init->vclamp},
	};

	/* initialize data for optional properties */
	init->treg = 3; /* 120 degrees Celsius */
	init->rbatcomp = init->vclamp = 0; /* IBAT compensation disabled */

	for (i = 0; i < ARRAY_SIZE(props); i++) {
		ret = device_property_read_u32(bq->dev, props[i].name,
					       &property);
		if (ret < 0) {
			if (props[i].optional)
				continue;

			dev_err(bq->dev, "Unable to read property %d %s\n", ret,
				props[i].name);

			return ret;
		}

		*props[i].conv_data = bq25890_find_idx(property,
						       props[i].tbl_id);
	}

	return 0;
}

static int bq25890_fw_probe(struct bq25890_device *bq)
{
	int ret;
	struct bq25890_init_data *init = &bq->init_data;

	/* Optional, left at 0 if property is not present */
	device_property_read_u32(bq->dev, "linux,pump-express-vbus-max",
				 &bq->pump_express_vbus_max);

	bq->skip_reset = device_property_read_bool(bq->dev, "linux,skip-reset");
	bq->read_back_init_data = device_property_read_bool(bq->dev,
						"linux,read-back-settings");
	if (bq->read_back_init_data)
		return 0;

	ret = bq25890_fw_read_u32_props(bq);
	if (ret < 0)
		return ret;

	init->ilim_en = device_property_read_bool(bq->dev, "ti,use-ilim-pin");
	init->boostf = device_property_read_bool(bq->dev, "ti,boost-low-freq");

	return 0;
}

static void bq25890_non_devm_cleanup(void *data)
{
	struct bq25890_device *bq = data;

	cancel_delayed_work_sync(&bq->pump_express_work);
}

static int bq25890_probe(struct i2c_client *client)
{
	struct device *dev = &client->dev;
	struct bq25890_device *bq;
	int ret;

	bq = devm_kzalloc(dev, sizeof(*bq), GFP_KERNEL);
	if (!bq)
		return -ENOMEM;

	bq->client = client;
	bq->dev = dev;

	mutex_init(&bq->lock);
	INIT_DELAYED_WORK(&bq->pump_express_work, bq25890_pump_express_work);

	bq->rmap = devm_regmap_init_i2c(client, &bq25890_regmap_config);
	if (IS_ERR(bq->rmap))
		return dev_err_probe(dev, PTR_ERR(bq->rmap),
				     "failed to allocate register map\n");

	ret = devm_regmap_field_bulk_alloc(dev, bq->rmap, bq->rmap_fields,
					   bq25890_reg_fields, F_MAX_FIELDS);
	if (ret)
		return ret;

	i2c_set_clientdata(client, bq);

	ret = bq25890_get_chip_version(bq);
	if (ret) {
		dev_err(dev, "Cannot read chip ID or unknown chip: %d\n", ret);
		return ret;
	}

	ret = bq25890_fw_probe(bq);
	if (ret < 0)
		return dev_err_probe(dev, ret, "reading device properties\n");

	ret = bq25890_hw_init(bq);
	if (ret < 0) {
		dev_err(dev, "Cannot initialize the chip: %d\n", ret);
		return ret;
	}

	if (client->irq <= 0)
		client->irq = bq25890_irq_probe(bq);

	if (client->irq < 0) {
		dev_err(dev, "No irq resource found.\n");
		return client->irq;
	}

	/* OTG reporting */
	bq->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);

	/*
	 * This must be before bq25890_power_supply_init(), so that it runs
	 * after devm unregisters the power_supply.
	 */
	ret = devm_add_action_or_reset(dev, bq25890_non_devm_cleanup, bq);
	if (ret)
		return ret;

	ret = bq25890_register_regulator(bq);
	if (ret)
		return ret;

	if (!IS_ERR_OR_NULL(bq->usb_phy)) {
		INIT_WORK(&bq->usb_work, bq25890_usb_work);
		bq->usb_nb.notifier_call = bq25890_usb_notifier;
		usb_register_notifier(bq->usb_phy, &bq->usb_nb);
	}

	ret = bq25890_power_supply_init(bq);
	if (ret < 0) {
		dev_err(dev, "Failed to register power supply\n");
		goto err_unregister_usb_notifier;
	}

	ret = devm_request_threaded_irq(dev, client->irq, NULL,
					bq25890_irq_handler_thread,
					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					BQ25890_IRQ_PIN, bq);
	if (ret)
		goto err_unregister_usb_notifier;

	return 0;

err_unregister_usb_notifier:
	if (!IS_ERR_OR_NULL(bq->usb_phy))
		usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);

	return ret;
}

static void bq25890_remove(struct i2c_client *client)
{
	struct bq25890_device *bq = i2c_get_clientdata(client);

	if (!IS_ERR_OR_NULL(bq->usb_phy))
		usb_unregister_notifier(bq->usb_phy, &bq->usb_nb);

	if (!bq->skip_reset) {
		/* reset all registers to default values */
		bq25890_chip_reset(bq);
	}
}

static void bq25890_shutdown(struct i2c_client *client)
{
	struct bq25890_device *bq = i2c_get_clientdata(client);

	/*
	 * TODO this if + return should probably be removed, but that would
	 * introduce a function change for boards using the usb-phy framework.
	 * This needs to be tested on such a board before making this change.
	 */
	if (!IS_ERR_OR_NULL(bq->usb_phy))
		return;

	/*
	 * Turn off the 5v Boost regulator which outputs Vbus to the device's
	 * Micro-USB or Type-C USB port. Leaving this on drains power and
	 * this avoids the PMIC on some device-models seeing this as Vbus
	 * getting inserted after shutdown, causing the device to immediately
	 * power-up again.
	 */
	bq25890_set_otg_cfg(bq, 0);
}

#ifdef CONFIG_PM_SLEEP
static int bq25890_suspend(struct device *dev)
{
	struct bq25890_device *bq = dev_get_drvdata(dev);

	/*
	 * If charger is removed, while in suspend, make sure ADC is diabled
	 * since it consumes slightly more power.
	 */
	return bq25890_field_write(bq, F_CONV_RATE, 0);
}

static int bq25890_resume(struct device *dev)
{
	int ret;
	struct bq25890_device *bq = dev_get_drvdata(dev);

	mutex_lock(&bq->lock);

	ret = bq25890_get_chip_state(bq, &bq->state);
	if (ret < 0)
		goto unlock;

	/* Re-enable ADC only if charger is plugged in. */
	if (bq->state.online) {
		ret = bq25890_field_write(bq, F_CONV_RATE, 1);
		if (ret < 0)
			goto unlock;
	}

	/* signal userspace, maybe state changed while suspended */
	power_supply_changed(bq->charger);

unlock:
	mutex_unlock(&bq->lock);

	return ret;
}
#endif

static const struct dev_pm_ops bq25890_pm = {
	SET_SYSTEM_SLEEP_PM_OPS(bq25890_suspend, bq25890_resume)
};

static const struct i2c_device_id bq25890_i2c_ids[] = {
	{ "bq25890", 0 },
	{ "bq25892", 0 },
	{ "bq25895", 0 },
	{ "bq25896", 0 },
	{},
};
MODULE_DEVICE_TABLE(i2c, bq25890_i2c_ids);

static const struct of_device_id bq25890_of_match[] = {
	{ .compatible = "ti,bq25890", },
	{ .compatible = "ti,bq25892", },
	{ .compatible = "ti,bq25895", },
	{ .compatible = "ti,bq25896", },
	{ },
};
MODULE_DEVICE_TABLE(of, bq25890_of_match);

#ifdef CONFIG_ACPI
static const struct acpi_device_id bq25890_acpi_match[] = {
	{"BQ258900", 0},
	{},
};
MODULE_DEVICE_TABLE(acpi, bq25890_acpi_match);
#endif

static struct i2c_driver bq25890_driver = {
	.driver = {
		.name = "bq25890-charger",
		.of_match_table = of_match_ptr(bq25890_of_match),
		.acpi_match_table = ACPI_PTR(bq25890_acpi_match),
		.pm = &bq25890_pm,
	},
	.probe_new = bq25890_probe,
	.remove = bq25890_remove,
	.shutdown = bq25890_shutdown,
	.id_table = bq25890_i2c_ids,
};
module_i2c_driver(bq25890_driver);

MODULE_AUTHOR("Laurentiu Palcu <laurentiu.palcu@intel.com>");
MODULE_DESCRIPTION("bq25890 charger driver");
MODULE_LICENSE("GPL");