summaryrefslogtreecommitdiffstats
path: root/drivers/power/supply/smb347-charger.c
blob: d56e469043bb8ba51dbd734498384a2b0f87061b (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Summit Microelectronics SMB347 Battery Charger Driver
 *
 * Copyright (C) 2011, Intel Corporation
 *
 * Authors: Bruce E. Robertson <bruce.e.robertson@intel.com>
 *          Mika Westerberg <mika.westerberg@linux.intel.com>
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/power_supply.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/regulator/driver.h>

#include <dt-bindings/power/summit,smb347-charger.h>

/* Use the default compensation method */
#define SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT -1

/* Use default factory programmed value for hard/soft temperature limit */
#define SMB3XX_TEMP_USE_DEFAULT		-273

/*
 * Configuration registers. These are mirrored to volatile RAM and can be
 * written once %CMD_A_ALLOW_WRITE is set in %CMD_A register. They will be
 * reloaded from non-volatile registers after POR.
 */
#define CFG_CHARGE_CURRENT			0x00
#define CFG_CHARGE_CURRENT_FCC_MASK		0xe0
#define CFG_CHARGE_CURRENT_FCC_SHIFT		5
#define CFG_CHARGE_CURRENT_PCC_MASK		0x18
#define CFG_CHARGE_CURRENT_PCC_SHIFT		3
#define CFG_CHARGE_CURRENT_TC_MASK		0x07
#define CFG_CURRENT_LIMIT			0x01
#define CFG_CURRENT_LIMIT_DC_MASK		0xf0
#define CFG_CURRENT_LIMIT_DC_SHIFT		4
#define CFG_CURRENT_LIMIT_USB_MASK		0x0f
#define CFG_FLOAT_VOLTAGE			0x03
#define CFG_FLOAT_VOLTAGE_FLOAT_MASK		0x3f
#define CFG_FLOAT_VOLTAGE_THRESHOLD_MASK	0xc0
#define CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT	6
#define CFG_STAT				0x05
#define CFG_STAT_DISABLED			BIT(5)
#define CFG_STAT_ACTIVE_HIGH			BIT(7)
#define CFG_PIN					0x06
#define CFG_PIN_EN_CTRL_MASK			0x60
#define CFG_PIN_EN_CTRL_ACTIVE_HIGH		0x40
#define CFG_PIN_EN_CTRL_ACTIVE_LOW		0x60
#define CFG_PIN_EN_APSD_IRQ			BIT(1)
#define CFG_PIN_EN_CHARGER_ERROR		BIT(2)
#define CFG_PIN_EN_CTRL				BIT(4)
#define CFG_THERM				0x07
#define CFG_THERM_SOFT_HOT_COMPENSATION_MASK	0x03
#define CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT	0
#define CFG_THERM_SOFT_COLD_COMPENSATION_MASK	0x0c
#define CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT	2
#define CFG_THERM_MONITOR_DISABLED		BIT(4)
#define CFG_SYSOK				0x08
#define CFG_SYSOK_INOK_ACTIVE_HIGH		BIT(0)
#define CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED	BIT(2)
#define CFG_OTHER				0x09
#define CFG_OTHER_RID_MASK			0xc0
#define CFG_OTHER_RID_ENABLED_AUTO_OTG		0xc0
#define CFG_OTG					0x0a
#define CFG_OTG_TEMP_THRESHOLD_MASK		0x30
#define CFG_OTG_CURRENT_LIMIT_250mA		BIT(2)
#define CFG_OTG_CURRENT_LIMIT_750mA		BIT(3)
#define CFG_OTG_TEMP_THRESHOLD_SHIFT		4
#define CFG_OTG_CC_COMPENSATION_MASK		0xc0
#define CFG_OTG_CC_COMPENSATION_SHIFT		6
#define CFG_TEMP_LIMIT				0x0b
#define CFG_TEMP_LIMIT_SOFT_HOT_MASK		0x03
#define CFG_TEMP_LIMIT_SOFT_HOT_SHIFT		0
#define CFG_TEMP_LIMIT_SOFT_COLD_MASK		0x0c
#define CFG_TEMP_LIMIT_SOFT_COLD_SHIFT		2
#define CFG_TEMP_LIMIT_HARD_HOT_MASK		0x30
#define CFG_TEMP_LIMIT_HARD_HOT_SHIFT		4
#define CFG_TEMP_LIMIT_HARD_COLD_MASK		0xc0
#define CFG_TEMP_LIMIT_HARD_COLD_SHIFT		6
#define CFG_FAULT_IRQ				0x0c
#define CFG_FAULT_IRQ_DCIN_UV			BIT(2)
#define CFG_STATUS_IRQ				0x0d
#define CFG_STATUS_IRQ_TERMINATION_OR_TAPER	BIT(4)
#define CFG_STATUS_IRQ_CHARGE_TIMEOUT		BIT(7)
#define CFG_ADDRESS				0x0e

/* Command registers */
#define CMD_A					0x30
#define CMD_A_CHG_ENABLED			BIT(1)
#define CMD_A_SUSPEND_ENABLED			BIT(2)
#define CMD_A_OTG_ENABLED			BIT(4)
#define CMD_A_ALLOW_WRITE			BIT(7)
#define CMD_B					0x31
#define CMD_C					0x33

/* Interrupt Status registers */
#define IRQSTAT_A				0x35
#define IRQSTAT_C				0x37
#define IRQSTAT_C_TERMINATION_STAT		BIT(0)
#define IRQSTAT_C_TERMINATION_IRQ		BIT(1)
#define IRQSTAT_C_TAPER_IRQ			BIT(3)
#define IRQSTAT_D				0x38
#define IRQSTAT_D_CHARGE_TIMEOUT_STAT		BIT(2)
#define IRQSTAT_D_CHARGE_TIMEOUT_IRQ		BIT(3)
#define IRQSTAT_E				0x39
#define IRQSTAT_E_USBIN_UV_STAT			BIT(0)
#define IRQSTAT_E_USBIN_UV_IRQ			BIT(1)
#define IRQSTAT_E_DCIN_UV_STAT			BIT(4)
#define IRQSTAT_E_DCIN_UV_IRQ			BIT(5)
#define IRQSTAT_F				0x3a

/* Status registers */
#define STAT_A					0x3b
#define STAT_A_FLOAT_VOLTAGE_MASK		0x3f
#define STAT_B					0x3c
#define STAT_C					0x3d
#define STAT_C_CHG_ENABLED			BIT(0)
#define STAT_C_HOLDOFF_STAT			BIT(3)
#define STAT_C_CHG_MASK				0x06
#define STAT_C_CHG_SHIFT			1
#define STAT_C_CHG_TERM				BIT(5)
#define STAT_C_CHARGER_ERROR			BIT(6)
#define STAT_E					0x3f

#define SMB347_MAX_REGISTER			0x3f

/**
 * struct smb347_charger - smb347 charger instance
 * @dev: pointer to device
 * @regmap: pointer to driver regmap
 * @mains: power_supply instance for AC/DC power
 * @usb: power_supply instance for USB power
 * @usb_rdev: USB VBUS regulator device
 * @id: SMB charger ID
 * @mains_online: is AC/DC input connected
 * @usb_online: is USB input connected
 * @irq_unsupported: is interrupt unsupported by SMB hardware
 * @usb_vbus_enabled: is USB VBUS powered by SMB charger
 * @max_charge_current: maximum current (in uA) the battery can be charged
 * @max_charge_voltage: maximum voltage (in uV) the battery can be charged
 * @pre_charge_current: current (in uA) to use in pre-charging phase
 * @termination_current: current (in uA) used to determine when the
 *			 charging cycle terminates
 * @pre_to_fast_voltage: voltage (in uV) treshold used for transitioning to
 *			 pre-charge to fast charge mode
 * @mains_current_limit: maximum input current drawn from AC/DC input (in uA)
 * @usb_hc_current_limit: maximum input high current (in uA) drawn from USB
 *			  input
 * @chip_temp_threshold: die temperature where device starts limiting charge
 *			 current [%100 - %130] (in degree C)
 * @soft_cold_temp_limit: soft cold temperature limit [%0 - %15] (in degree C),
 *			  granularity is 5 deg C.
 * @soft_hot_temp_limit: soft hot temperature limit [%40 - %55] (in degree  C),
 *			 granularity is 5 deg C.
 * @hard_cold_temp_limit: hard cold temperature limit [%-5 - %10] (in degree C),
 *			  granularity is 5 deg C.
 * @hard_hot_temp_limit: hard hot temperature limit [%50 - %65] (in degree C),
 *			 granularity is 5 deg C.
 * @suspend_on_hard_temp_limit: suspend charging when hard limit is hit
 * @soft_temp_limit_compensation: compensation method when soft temperature
 *				  limit is hit
 * @charge_current_compensation: current (in uA) for charging compensation
 *				 current when temperature hits soft limits
 * @use_mains: AC/DC input can be used
 * @use_usb: USB input can be used
 * @use_usb_otg: USB OTG output can be used (not implemented yet)
 * @enable_control: how charging enable/disable is controlled
 *		    (driver/pin controls)
 * @inok_polarity: polarity of INOK signal which denotes presence of external
 *		   power supply
 *
 * @use_main, @use_usb, and @use_usb_otg are means to enable/disable
 * hardware support for these. This is useful when we want to have for
 * example OTG charging controlled via OTG transceiver driver and not by
 * the SMB347 hardware.
 *
 * Hard and soft temperature limit values are given as described in the
 * device data sheet and assuming NTC beta value is %3750. Even if this is
 * not the case, these values should be used. They can be mapped to the
 * corresponding NTC beta values with the help of table %2 in the data
 * sheet. So for example if NTC beta is %3375 and we want to program hard
 * hot limit to be %53 deg C, @hard_hot_temp_limit should be set to %50.
 *
 * If zero value is given in any of the current and voltage values, the
 * factory programmed default will be used. For soft/hard temperature
 * values, pass in %SMB3XX_TEMP_USE_DEFAULT instead.
 */
struct smb347_charger {
	struct device		*dev;
	struct regmap		*regmap;
	struct power_supply	*mains;
	struct power_supply	*usb;
	struct regulator_dev	*usb_rdev;
	unsigned int		id;
	bool			mains_online;
	bool			usb_online;
	bool			irq_unsupported;
	bool			usb_vbus_enabled;

	unsigned int		max_charge_current;
	unsigned int		max_charge_voltage;
	unsigned int		pre_charge_current;
	unsigned int		termination_current;
	unsigned int		pre_to_fast_voltage;
	unsigned int		mains_current_limit;
	unsigned int		usb_hc_current_limit;
	unsigned int		chip_temp_threshold;
	int			soft_cold_temp_limit;
	int			soft_hot_temp_limit;
	int			hard_cold_temp_limit;
	int			hard_hot_temp_limit;
	bool			suspend_on_hard_temp_limit;
	unsigned int		soft_temp_limit_compensation;
	unsigned int		charge_current_compensation;
	bool			use_mains;
	bool			use_usb;
	bool			use_usb_otg;
	unsigned int		enable_control;
	unsigned int		inok_polarity;
};

enum smb_charger_chipid {
	SMB345,
	SMB347,
	SMB358,
	NUM_CHIP_TYPES,
};

/* Fast charge current in uA */
static const unsigned int fcc_tbl[NUM_CHIP_TYPES][8] = {
	[SMB345] = {  200000,  450000,  600000,  900000,
		     1300000, 1500000, 1800000, 2000000 },
	[SMB347] = {  700000,  900000, 1200000, 1500000,
		     1800000, 2000000, 2200000, 2500000 },
	[SMB358] = {  200000,  450000,  600000,  900000,
		     1300000, 1500000, 1800000, 2000000 },
};
/* Pre-charge current in uA */
static const unsigned int pcc_tbl[NUM_CHIP_TYPES][4] = {
	[SMB345] = { 150000, 250000, 350000, 450000 },
	[SMB347] = { 100000, 150000, 200000, 250000 },
	[SMB358] = { 150000, 250000, 350000, 450000 },
};

/* Termination current in uA */
static const unsigned int tc_tbl[NUM_CHIP_TYPES][8] = {
	[SMB345] = {  30000,  40000,  60000,  80000,
		     100000, 125000, 150000, 200000 },
	[SMB347] = {  37500,  50000, 100000, 150000,
		     200000, 250000, 500000, 600000 },
	[SMB358] = {  30000,  40000,  60000,  80000,
		     100000, 125000, 150000, 200000 },
};

/* Input current limit in uA */
static const unsigned int icl_tbl[NUM_CHIP_TYPES][10] = {
	[SMB345] = {  300000,  500000,  700000, 1000000, 1500000,
		     1800000, 2000000, 2000000, 2000000, 2000000 },
	[SMB347] = {  300000,  500000,  700000,  900000, 1200000,
		     1500000, 1800000, 2000000, 2200000, 2500000 },
	[SMB358] = {  300000,  500000,  700000, 1000000, 1500000,
		     1800000, 2000000, 2000000, 2000000, 2000000 },
};

/* Charge current compensation in uA */
static const unsigned int ccc_tbl[NUM_CHIP_TYPES][4] = {
	[SMB345] = {  200000,  450000,  600000,  900000 },
	[SMB347] = {  250000,  700000,  900000, 1200000 },
	[SMB358] = {  200000,  450000,  600000,  900000 },
};

/* Convert register value to current using lookup table */
static int hw_to_current(const unsigned int *tbl, size_t size, unsigned int val)
{
	if (val >= size)
		return -EINVAL;
	return tbl[val];
}

/* Convert current to register value using lookup table */
static int current_to_hw(const unsigned int *tbl, size_t size, unsigned int val)
{
	size_t i;

	for (i = 0; i < size; i++)
		if (val < tbl[i])
			break;
	return i > 0 ? i - 1 : -EINVAL;
}

/**
 * smb347_update_ps_status - refreshes the power source status
 * @smb: pointer to smb347 charger instance
 *
 * Function checks whether any power source is connected to the charger and
 * updates internal state accordingly. If there is a change to previous state
 * function returns %1, otherwise %0 and negative errno in case of errror.
 */
static int smb347_update_ps_status(struct smb347_charger *smb)
{
	bool usb = false;
	bool dc = false;
	unsigned int val;
	int ret;

	ret = regmap_read(smb->regmap, IRQSTAT_E, &val);
	if (ret < 0)
		return ret;

	/*
	 * Dc and usb are set depending on whether they are enabled in
	 * platform data _and_ whether corresponding undervoltage is set.
	 */
	if (smb->use_mains)
		dc = !(val & IRQSTAT_E_DCIN_UV_STAT);
	if (smb->use_usb)
		usb = !(val & IRQSTAT_E_USBIN_UV_STAT);

	ret = smb->mains_online != dc || smb->usb_online != usb;
	smb->mains_online = dc;
	smb->usb_online = usb;

	return ret;
}

/*
 * smb347_is_ps_online - returns whether input power source is connected
 * @smb: pointer to smb347 charger instance
 *
 * Returns %true if input power source is connected. Note that this is
 * dependent on what platform has configured for usable power sources. For
 * example if USB is disabled, this will return %false even if the USB cable
 * is connected.
 */
static bool smb347_is_ps_online(struct smb347_charger *smb)
{
	return smb->usb_online || smb->mains_online;
}

/**
 * smb347_charging_status - returns status of charging
 * @smb: pointer to smb347 charger instance
 *
 * Function returns charging status. %0 means no charging is in progress,
 * %1 means pre-charging, %2 fast-charging and %3 taper-charging.
 */
static int smb347_charging_status(struct smb347_charger *smb)
{
	unsigned int val;
	int ret;

	if (!smb347_is_ps_online(smb))
		return 0;

	ret = regmap_read(smb->regmap, STAT_C, &val);
	if (ret < 0)
		return 0;

	return (val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT;
}

static int smb347_charging_set(struct smb347_charger *smb, bool enable)
{
	if (smb->enable_control != SMB3XX_CHG_ENABLE_SW) {
		dev_dbg(smb->dev, "charging enable/disable in SW disabled\n");
		return 0;
	}

	if (enable && smb->usb_vbus_enabled) {
		dev_dbg(smb->dev, "charging not enabled because USB is in host mode\n");
		return 0;
	}

	return regmap_update_bits(smb->regmap, CMD_A, CMD_A_CHG_ENABLED,
				  enable ? CMD_A_CHG_ENABLED : 0);
}

static inline int smb347_charging_enable(struct smb347_charger *smb)
{
	return smb347_charging_set(smb, true);
}

static inline int smb347_charging_disable(struct smb347_charger *smb)
{
	return smb347_charging_set(smb, false);
}

static int smb347_start_stop_charging(struct smb347_charger *smb)
{
	int ret;

	/*
	 * Depending on whether valid power source is connected or not, we
	 * disable or enable the charging. We do it manually because it
	 * depends on how the platform has configured the valid inputs.
	 */
	if (smb347_is_ps_online(smb)) {
		ret = smb347_charging_enable(smb);
		if (ret < 0)
			dev_err(smb->dev, "failed to enable charging\n");
	} else {
		ret = smb347_charging_disable(smb);
		if (ret < 0)
			dev_err(smb->dev, "failed to disable charging\n");
	}

	return ret;
}

static int smb347_set_charge_current(struct smb347_charger *smb)
{
	unsigned int id = smb->id;
	int ret;

	if (smb->max_charge_current) {
		ret = current_to_hw(fcc_tbl[id], ARRAY_SIZE(fcc_tbl[id]),
				    smb->max_charge_current);
		if (ret < 0)
			return ret;

		ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
					 CFG_CHARGE_CURRENT_FCC_MASK,
					 ret << CFG_CHARGE_CURRENT_FCC_SHIFT);
		if (ret < 0)
			return ret;
	}

	if (smb->pre_charge_current) {
		ret = current_to_hw(pcc_tbl[id], ARRAY_SIZE(pcc_tbl[id]),
				    smb->pre_charge_current);
		if (ret < 0)
			return ret;

		ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
					 CFG_CHARGE_CURRENT_PCC_MASK,
					 ret << CFG_CHARGE_CURRENT_PCC_SHIFT);
		if (ret < 0)
			return ret;
	}

	if (smb->termination_current) {
		ret = current_to_hw(tc_tbl[id], ARRAY_SIZE(tc_tbl[id]),
				    smb->termination_current);
		if (ret < 0)
			return ret;

		ret = regmap_update_bits(smb->regmap, CFG_CHARGE_CURRENT,
					 CFG_CHARGE_CURRENT_TC_MASK, ret);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int smb347_set_current_limits(struct smb347_charger *smb)
{
	unsigned int id = smb->id;
	int ret;

	if (smb->mains_current_limit) {
		ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
				    smb->mains_current_limit);
		if (ret < 0)
			return ret;

		ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
					 CFG_CURRENT_LIMIT_DC_MASK,
					 ret << CFG_CURRENT_LIMIT_DC_SHIFT);
		if (ret < 0)
			return ret;
	}

	if (smb->usb_hc_current_limit) {
		ret = current_to_hw(icl_tbl[id], ARRAY_SIZE(icl_tbl[id]),
				    smb->usb_hc_current_limit);
		if (ret < 0)
			return ret;

		ret = regmap_update_bits(smb->regmap, CFG_CURRENT_LIMIT,
					 CFG_CURRENT_LIMIT_USB_MASK, ret);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int smb347_set_voltage_limits(struct smb347_charger *smb)
{
	int ret;

	if (smb->pre_to_fast_voltage) {
		ret = smb->pre_to_fast_voltage;

		/* uV */
		ret = clamp_val(ret, 2400000, 3000000) - 2400000;
		ret /= 200000;

		ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
				CFG_FLOAT_VOLTAGE_THRESHOLD_MASK,
				ret << CFG_FLOAT_VOLTAGE_THRESHOLD_SHIFT);
		if (ret < 0)
			return ret;
	}

	if (smb->max_charge_voltage) {
		ret = smb->max_charge_voltage;

		/* uV */
		ret = clamp_val(ret, 3500000, 4500000) - 3500000;
		ret /= 20000;

		ret = regmap_update_bits(smb->regmap, CFG_FLOAT_VOLTAGE,
					 CFG_FLOAT_VOLTAGE_FLOAT_MASK, ret);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static int smb347_set_temp_limits(struct smb347_charger *smb)
{
	unsigned int id = smb->id;
	bool enable_therm_monitor = false;
	int ret = 0;
	int val;

	if (smb->chip_temp_threshold) {
		val = smb->chip_temp_threshold;

		/* degree C */
		val = clamp_val(val, 100, 130) - 100;
		val /= 10;

		ret = regmap_update_bits(smb->regmap, CFG_OTG,
					 CFG_OTG_TEMP_THRESHOLD_MASK,
					 val << CFG_OTG_TEMP_THRESHOLD_SHIFT);
		if (ret < 0)
			return ret;
	}

	if (smb->soft_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
		val = smb->soft_cold_temp_limit;

		val = clamp_val(val, 0, 15);
		val /= 5;
		/* this goes from higher to lower so invert the value */
		val = ~val & 0x3;

		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
					 CFG_TEMP_LIMIT_SOFT_COLD_MASK,
					 val << CFG_TEMP_LIMIT_SOFT_COLD_SHIFT);
		if (ret < 0)
			return ret;

		enable_therm_monitor = true;
	}

	if (smb->soft_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
		val = smb->soft_hot_temp_limit;

		val = clamp_val(val, 40, 55) - 40;
		val /= 5;

		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
					 CFG_TEMP_LIMIT_SOFT_HOT_MASK,
					 val << CFG_TEMP_LIMIT_SOFT_HOT_SHIFT);
		if (ret < 0)
			return ret;

		enable_therm_monitor = true;
	}

	if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
		val = smb->hard_cold_temp_limit;

		val = clamp_val(val, -5, 10) + 5;
		val /= 5;
		/* this goes from higher to lower so invert the value */
		val = ~val & 0x3;

		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
					 CFG_TEMP_LIMIT_HARD_COLD_MASK,
					 val << CFG_TEMP_LIMIT_HARD_COLD_SHIFT);
		if (ret < 0)
			return ret;

		enable_therm_monitor = true;
	}

	if (smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT) {
		val = smb->hard_hot_temp_limit;

		val = clamp_val(val, 50, 65) - 50;
		val /= 5;

		ret = regmap_update_bits(smb->regmap, CFG_TEMP_LIMIT,
					 CFG_TEMP_LIMIT_HARD_HOT_MASK,
					 val << CFG_TEMP_LIMIT_HARD_HOT_SHIFT);
		if (ret < 0)
			return ret;

		enable_therm_monitor = true;
	}

	/*
	 * If any of the temperature limits are set, we also enable the
	 * thermistor monitoring.
	 *
	 * When soft limits are hit, the device will start to compensate
	 * current and/or voltage depending on the configuration.
	 *
	 * When hard limit is hit, the device will suspend charging
	 * depending on the configuration.
	 */
	if (enable_therm_monitor) {
		ret = regmap_update_bits(smb->regmap, CFG_THERM,
					 CFG_THERM_MONITOR_DISABLED, 0);
		if (ret < 0)
			return ret;
	}

	if (smb->suspend_on_hard_temp_limit) {
		ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
				 CFG_SYSOK_SUSPEND_HARD_LIMIT_DISABLED, 0);
		if (ret < 0)
			return ret;
	}

	if (smb->soft_temp_limit_compensation !=
	    SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT) {
		val = smb->soft_temp_limit_compensation & 0x3;

		ret = regmap_update_bits(smb->regmap, CFG_THERM,
				 CFG_THERM_SOFT_HOT_COMPENSATION_MASK,
				 val << CFG_THERM_SOFT_HOT_COMPENSATION_SHIFT);
		if (ret < 0)
			return ret;

		ret = regmap_update_bits(smb->regmap, CFG_THERM,
				 CFG_THERM_SOFT_COLD_COMPENSATION_MASK,
				 val << CFG_THERM_SOFT_COLD_COMPENSATION_SHIFT);
		if (ret < 0)
			return ret;
	}

	if (smb->charge_current_compensation) {
		val = current_to_hw(ccc_tbl[id], ARRAY_SIZE(ccc_tbl[id]),
				    smb->charge_current_compensation);
		if (val < 0)
			return val;

		ret = regmap_update_bits(smb->regmap, CFG_OTG,
				CFG_OTG_CC_COMPENSATION_MASK,
				(val & 0x3) << CFG_OTG_CC_COMPENSATION_SHIFT);
		if (ret < 0)
			return ret;
	}

	return ret;
}

/*
 * smb347_set_writable - enables/disables writing to non-volatile registers
 * @smb: pointer to smb347 charger instance
 *
 * You can enable/disable writing to the non-volatile configuration
 * registers by calling this function.
 *
 * Returns %0 on success and negative errno in case of failure.
 */
static int smb347_set_writable(struct smb347_charger *smb, bool writable,
			       bool irq_toggle)
{
	struct i2c_client *client = to_i2c_client(smb->dev);
	int ret;

	if (writable && irq_toggle && !smb->irq_unsupported)
		disable_irq(client->irq);

	ret = regmap_update_bits(smb->regmap, CMD_A, CMD_A_ALLOW_WRITE,
				 writable ? CMD_A_ALLOW_WRITE : 0);

	if ((!writable || ret) && irq_toggle && !smb->irq_unsupported)
		enable_irq(client->irq);

	return ret;
}

static int smb347_hw_init(struct smb347_charger *smb)
{
	unsigned int val;
	int ret;

	ret = smb347_set_writable(smb, true, false);
	if (ret < 0)
		return ret;

	/*
	 * Program the platform specific configuration values to the device
	 * first.
	 */
	ret = smb347_set_charge_current(smb);
	if (ret < 0)
		goto fail;

	ret = smb347_set_current_limits(smb);
	if (ret < 0)
		goto fail;

	ret = smb347_set_voltage_limits(smb);
	if (ret < 0)
		goto fail;

	ret = smb347_set_temp_limits(smb);
	if (ret < 0)
		goto fail;

	/* If USB charging is disabled we put the USB in suspend mode */
	if (!smb->use_usb) {
		ret = regmap_update_bits(smb->regmap, CMD_A,
					 CMD_A_SUSPEND_ENABLED,
					 CMD_A_SUSPEND_ENABLED);
		if (ret < 0)
			goto fail;
	}

	/*
	 * If configured by platform data, we enable hardware Auto-OTG
	 * support for driving VBUS. Otherwise we disable it.
	 */
	ret = regmap_update_bits(smb->regmap, CFG_OTHER, CFG_OTHER_RID_MASK,
		smb->use_usb_otg ? CFG_OTHER_RID_ENABLED_AUTO_OTG : 0);
	if (ret < 0)
		goto fail;

	/* Activate pin control, making it writable. */
	switch (smb->enable_control) {
	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
		ret = regmap_set_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL);
		if (ret < 0)
			goto fail;
	}

	/*
	 * Make the charging functionality controllable by a write to the
	 * command register unless pin control is specified in the platform
	 * data.
	 */
	switch (smb->enable_control) {
	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_LOW:
		val = CFG_PIN_EN_CTRL_ACTIVE_LOW;
		break;
	case SMB3XX_CHG_ENABLE_PIN_ACTIVE_HIGH:
		val = CFG_PIN_EN_CTRL_ACTIVE_HIGH;
		break;
	default:
		val = 0;
		break;
	}

	ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CTRL_MASK,
				 val);
	if (ret < 0)
		goto fail;

	/* Disable Automatic Power Source Detection (APSD) interrupt. */
	ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_APSD_IRQ, 0);
	if (ret < 0)
		goto fail;

	ret = smb347_update_ps_status(smb);
	if (ret < 0)
		goto fail;

	ret = smb347_start_stop_charging(smb);

fail:
	smb347_set_writable(smb, false, false);
	return ret;
}

static irqreturn_t smb347_interrupt(int irq, void *data)
{
	struct smb347_charger *smb = data;
	unsigned int stat_c, irqstat_c, irqstat_d, irqstat_e;
	bool handled = false;
	int ret;

	/* SMB347 it needs at least 20ms for setting IRQSTAT_E_*IN_UV_IRQ */
	usleep_range(25000, 35000);

	ret = regmap_read(smb->regmap, STAT_C, &stat_c);
	if (ret < 0) {
		dev_warn(smb->dev, "reading STAT_C failed\n");
		return IRQ_NONE;
	}

	ret = regmap_read(smb->regmap, IRQSTAT_C, &irqstat_c);
	if (ret < 0) {
		dev_warn(smb->dev, "reading IRQSTAT_C failed\n");
		return IRQ_NONE;
	}

	ret = regmap_read(smb->regmap, IRQSTAT_D, &irqstat_d);
	if (ret < 0) {
		dev_warn(smb->dev, "reading IRQSTAT_D failed\n");
		return IRQ_NONE;
	}

	ret = regmap_read(smb->regmap, IRQSTAT_E, &irqstat_e);
	if (ret < 0) {
		dev_warn(smb->dev, "reading IRQSTAT_E failed\n");
		return IRQ_NONE;
	}

	/*
	 * If we get charger error we report the error back to user.
	 * If the error is recovered charging will resume again.
	 */
	if (stat_c & STAT_C_CHARGER_ERROR) {
		dev_err(smb->dev, "charging stopped due to charger error\n");
		if (smb->use_mains)
			power_supply_changed(smb->mains);
		if (smb->use_usb)
			power_supply_changed(smb->usb);
		handled = true;
	}

	/*
	 * If we reached the termination current the battery is charged and
	 * we can update the status now. Charging is automatically
	 * disabled by the hardware.
	 */
	if (irqstat_c & (IRQSTAT_C_TERMINATION_IRQ | IRQSTAT_C_TAPER_IRQ)) {
		if (irqstat_c & IRQSTAT_C_TERMINATION_STAT) {
			if (smb->use_mains)
				power_supply_changed(smb->mains);
			if (smb->use_usb)
				power_supply_changed(smb->usb);
		}
		dev_dbg(smb->dev, "going to HW maintenance mode\n");
		handled = true;
	}

	/*
	 * If we got a charger timeout INT that means the charge
	 * full is not detected with in charge timeout value.
	 */
	if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_IRQ) {
		dev_dbg(smb->dev, "total Charge Timeout INT received\n");

		if (irqstat_d & IRQSTAT_D_CHARGE_TIMEOUT_STAT)
			dev_warn(smb->dev, "charging stopped due to timeout\n");
		if (smb->use_mains)
			power_supply_changed(smb->mains);
		if (smb->use_usb)
			power_supply_changed(smb->usb);
		handled = true;
	}

	/*
	 * If we got an under voltage interrupt it means that AC/USB input
	 * was connected or disconnected.
	 */
	if (irqstat_e & (IRQSTAT_E_USBIN_UV_IRQ | IRQSTAT_E_DCIN_UV_IRQ)) {
		if (smb347_update_ps_status(smb) > 0) {
			smb347_start_stop_charging(smb);
			if (smb->use_mains)
				power_supply_changed(smb->mains);
			if (smb->use_usb)
				power_supply_changed(smb->usb);
		}
		handled = true;
	}

	return handled ? IRQ_HANDLED : IRQ_NONE;
}

static int smb347_irq_set(struct smb347_charger *smb, bool enable)
{
	int ret;

	if (smb->irq_unsupported)
		return 0;

	ret = smb347_set_writable(smb, true, true);
	if (ret < 0)
		return ret;

	/*
	 * Enable/disable interrupts for:
	 *	- under voltage
	 *	- termination current reached
	 *	- charger timeout
	 *	- charger error
	 */
	ret = regmap_update_bits(smb->regmap, CFG_FAULT_IRQ, 0xff,
				 enable ? CFG_FAULT_IRQ_DCIN_UV : 0);
	if (ret < 0)
		goto fail;

	ret = regmap_update_bits(smb->regmap, CFG_STATUS_IRQ, 0xff,
			enable ? (CFG_STATUS_IRQ_TERMINATION_OR_TAPER |
					CFG_STATUS_IRQ_CHARGE_TIMEOUT) : 0);
	if (ret < 0)
		goto fail;

	ret = regmap_update_bits(smb->regmap, CFG_PIN, CFG_PIN_EN_CHARGER_ERROR,
				 enable ? CFG_PIN_EN_CHARGER_ERROR : 0);
fail:
	smb347_set_writable(smb, false, true);
	return ret;
}

static inline int smb347_irq_enable(struct smb347_charger *smb)
{
	return smb347_irq_set(smb, true);
}

static inline int smb347_irq_disable(struct smb347_charger *smb)
{
	return smb347_irq_set(smb, false);
}

static int smb347_irq_init(struct smb347_charger *smb,
			   struct i2c_client *client)
{
	int ret;

	smb->irq_unsupported = true;

	/*
	 * Interrupt pin is optional. If it is connected, we setup the
	 * interrupt support here.
	 */
	if (!client->irq)
		return 0;

	ret = smb347_set_writable(smb, true, false);
	if (ret < 0)
		return ret;

	/*
	 * Configure the STAT output to be suitable for interrupts: disable
	 * all other output (except interrupts) and make it active low.
	 */
	ret = regmap_update_bits(smb->regmap, CFG_STAT,
				 CFG_STAT_ACTIVE_HIGH | CFG_STAT_DISABLED,
				 CFG_STAT_DISABLED);

	smb347_set_writable(smb, false, false);

	if (ret < 0) {
		dev_warn(smb->dev, "failed to initialize IRQ: %d\n", ret);
		dev_warn(smb->dev, "disabling IRQ support\n");
		return 0;
	}

	ret = devm_request_threaded_irq(smb->dev, client->irq, NULL,
					smb347_interrupt, IRQF_ONESHOT,
					client->name, smb);
	if (ret)
		return ret;

	smb->irq_unsupported = false;

	ret = smb347_irq_enable(smb);
	if (ret < 0)
		return ret;

	return 0;
}

/*
 * Returns the constant charge current programmed
 * into the charger in uA.
 */
static int get_const_charge_current(struct smb347_charger *smb)
{
	unsigned int id = smb->id;
	int ret, intval;
	unsigned int v;

	if (!smb347_is_ps_online(smb))
		return -ENODATA;

	ret = regmap_read(smb->regmap, STAT_B, &v);
	if (ret < 0)
		return ret;

	/*
	 * The current value is composition of FCC and PCC values
	 * and we can detect which table to use from bit 5.
	 */
	if (v & 0x20) {
		intval = hw_to_current(fcc_tbl[id],
				       ARRAY_SIZE(fcc_tbl[id]), v & 7);
	} else {
		v >>= 3;
		intval = hw_to_current(pcc_tbl[id],
				       ARRAY_SIZE(pcc_tbl[id]), v & 7);
	}

	return intval;
}

/*
 * Returns the constant charge voltage programmed
 * into the charger in uV.
 */
static int get_const_charge_voltage(struct smb347_charger *smb)
{
	int ret, intval;
	unsigned int v;

	if (!smb347_is_ps_online(smb))
		return -ENODATA;

	ret = regmap_read(smb->regmap, STAT_A, &v);
	if (ret < 0)
		return ret;

	v &= STAT_A_FLOAT_VOLTAGE_MASK;
	if (v > 0x3d)
		v = 0x3d;

	intval = 3500000 + v * 20000;

	return intval;
}

static int smb347_get_charging_status(struct smb347_charger *smb,
				      struct power_supply *psy)
{
	int ret, status;
	unsigned int val;

	if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
		if (!smb->usb_online)
			return POWER_SUPPLY_STATUS_DISCHARGING;
	} else {
		if (!smb->mains_online)
			return POWER_SUPPLY_STATUS_DISCHARGING;
	}

	ret = regmap_read(smb->regmap, STAT_C, &val);
	if (ret < 0)
		return ret;

	if ((val & STAT_C_CHARGER_ERROR) ||
			(val & STAT_C_HOLDOFF_STAT)) {
		/*
		 * set to NOT CHARGING upon charger error
		 * or charging has stopped.
		 */
		status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	} else {
		if ((val & STAT_C_CHG_MASK) >> STAT_C_CHG_SHIFT) {
			/*
			 * set to charging if battery is in pre-charge,
			 * fast charge or taper charging mode.
			 */
			status = POWER_SUPPLY_STATUS_CHARGING;
		} else if (val & STAT_C_CHG_TERM) {
			/*
			 * set the status to FULL if battery is not in pre
			 * charge, fast charge or taper charging mode AND
			 * charging is terminated at least once.
			 */
			status = POWER_SUPPLY_STATUS_FULL;
		} else {
			/*
			 * in this case no charger error or termination
			 * occured but charging is not in progress!!!
			 */
			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
		}
	}

	return status;
}

static int smb347_get_property_locked(struct power_supply *psy,
				      enum power_supply_property prop,
				      union power_supply_propval *val)
{
	struct smb347_charger *smb = power_supply_get_drvdata(psy);
	int ret;

	switch (prop) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = smb347_get_charging_status(smb, psy);
		if (ret < 0)
			return ret;
		val->intval = ret;
		break;

	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
			if (!smb->usb_online)
				return -ENODATA;
		} else {
			if (!smb->mains_online)
				return -ENODATA;
		}

		/*
		 * We handle trickle and pre-charging the same, and taper
		 * and none the same.
		 */
		switch (smb347_charging_status(smb)) {
		case 1:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
			break;
		case 2:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
			break;
		default:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
			break;
		}
		break;

	case POWER_SUPPLY_PROP_ONLINE:
		if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
			val->intval = smb->usb_online;
		else
			val->intval = smb->mains_online;
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
		ret = get_const_charge_voltage(smb);
		if (ret < 0)
			return ret;
		val->intval = ret;
		break;

	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
		ret = get_const_charge_current(smb);
		if (ret < 0)
			return ret;
		val->intval = ret;
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int smb347_get_property(struct power_supply *psy,
			       enum power_supply_property prop,
			       union power_supply_propval *val)
{
	struct smb347_charger *smb = power_supply_get_drvdata(psy);
	struct i2c_client *client = to_i2c_client(smb->dev);
	int ret;

	if (!smb->irq_unsupported)
		disable_irq(client->irq);

	ret = smb347_get_property_locked(psy, prop, val);

	if (!smb->irq_unsupported)
		enable_irq(client->irq);

	return ret;
}

static enum power_supply_property smb347_properties[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
};

static bool smb347_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case IRQSTAT_A:
	case IRQSTAT_C:
	case IRQSTAT_D:
	case IRQSTAT_E:
	case IRQSTAT_F:
	case STAT_A:
	case STAT_B:
	case STAT_C:
	case STAT_E:
		return true;
	}

	return false;
}

static bool smb347_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case CFG_CHARGE_CURRENT:
	case CFG_CURRENT_LIMIT:
	case CFG_FLOAT_VOLTAGE:
	case CFG_STAT:
	case CFG_PIN:
	case CFG_THERM:
	case CFG_SYSOK:
	case CFG_OTHER:
	case CFG_OTG:
	case CFG_TEMP_LIMIT:
	case CFG_FAULT_IRQ:
	case CFG_STATUS_IRQ:
	case CFG_ADDRESS:
	case CMD_A:
	case CMD_B:
	case CMD_C:
		return true;
	}

	return smb347_volatile_reg(dev, reg);
}

static void smb347_dt_parse_dev_info(struct smb347_charger *smb)
{
	struct device *dev = smb->dev;

	smb->soft_temp_limit_compensation =
					SMB3XX_SOFT_TEMP_COMPENSATE_DEFAULT;
	/*
	 * These properties come from the battery info, still we need to
	 * pre-initialize the values. See smb347_get_battery_info() below.
	 */
	smb->soft_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
	smb->hard_cold_temp_limit = SMB3XX_TEMP_USE_DEFAULT;
	smb->soft_hot_temp_limit  = SMB3XX_TEMP_USE_DEFAULT;
	smb->hard_hot_temp_limit  = SMB3XX_TEMP_USE_DEFAULT;

	/* Charging constraints */
	device_property_read_u32(dev, "summit,fast-voltage-threshold-microvolt",
				 &smb->pre_to_fast_voltage);
	device_property_read_u32(dev, "summit,mains-current-limit-microamp",
				 &smb->mains_current_limit);
	device_property_read_u32(dev, "summit,usb-current-limit-microamp",
				 &smb->usb_hc_current_limit);

	/* For thermometer monitoring */
	device_property_read_u32(dev, "summit,chip-temperature-threshold-celsius",
				 &smb->chip_temp_threshold);
	device_property_read_u32(dev, "summit,soft-compensation-method",
				 &smb->soft_temp_limit_compensation);
	device_property_read_u32(dev, "summit,charge-current-compensation-microamp",
				 &smb->charge_current_compensation);

	/* Supported charging mode */
	smb->use_mains = device_property_read_bool(dev, "summit,enable-mains-charging");
	smb->use_usb = device_property_read_bool(dev, "summit,enable-usb-charging");
	smb->use_usb_otg = device_property_read_bool(dev, "summit,enable-otg-charging");

	/* Select charging control */
	device_property_read_u32(dev, "summit,enable-charge-control",
				 &smb->enable_control);

	/*
	 * Polarity of INOK signal indicating presence of external power
	 * supply connected to the charger.
	 */
	device_property_read_u32(dev, "summit,inok-polarity",
				 &smb->inok_polarity);
}

static int smb347_get_battery_info(struct smb347_charger *smb)
{
	struct power_supply_battery_info *info;
	struct power_supply *supply;
	int err;

	if (smb->mains)
		supply = smb->mains;
	else
		supply = smb->usb;

	err = power_supply_get_battery_info(supply, &info);
	if (err == -ENXIO || err == -ENODEV)
		return 0;
	if (err)
		return err;

	if (info->constant_charge_current_max_ua != -EINVAL)
		smb->max_charge_current = info->constant_charge_current_max_ua;

	if (info->constant_charge_voltage_max_uv != -EINVAL)
		smb->max_charge_voltage = info->constant_charge_voltage_max_uv;

	if (info->precharge_current_ua != -EINVAL)
		smb->pre_charge_current = info->precharge_current_ua;

	if (info->charge_term_current_ua != -EINVAL)
		smb->termination_current = info->charge_term_current_ua;

	if (info->temp_alert_min != INT_MIN)
		smb->soft_cold_temp_limit = info->temp_alert_min;

	if (info->temp_alert_max != INT_MAX)
		smb->soft_hot_temp_limit = info->temp_alert_max;

	if (info->temp_min != INT_MIN)
		smb->hard_cold_temp_limit = info->temp_min;

	if (info->temp_max != INT_MAX)
		smb->hard_hot_temp_limit = info->temp_max;

	/* Suspend when battery temperature is outside hard limits */
	if (smb->hard_cold_temp_limit != SMB3XX_TEMP_USE_DEFAULT ||
	    smb->hard_hot_temp_limit != SMB3XX_TEMP_USE_DEFAULT)
		smb->suspend_on_hard_temp_limit = true;

	return 0;
}

static int smb347_usb_vbus_get_current_limit(struct regulator_dev *rdev)
{
	struct smb347_charger *smb = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret;

	ret = regmap_read(smb->regmap, CFG_OTG, &val);
	if (ret < 0)
		return ret;

	/*
	 * It's unknown what happens if this bit is unset due to lack of
	 * access to the datasheet, assume it's limit-enable.
	 */
	if (!(val & CFG_OTG_CURRENT_LIMIT_250mA))
		return 0;

	return val & CFG_OTG_CURRENT_LIMIT_750mA ? 750000 : 250000;
}

static int smb347_usb_vbus_set_new_current_limit(struct smb347_charger *smb,
						 int max_uA)
{
	const unsigned int mask = CFG_OTG_CURRENT_LIMIT_750mA |
				  CFG_OTG_CURRENT_LIMIT_250mA;
	unsigned int val = CFG_OTG_CURRENT_LIMIT_250mA;
	int ret;

	if (max_uA >= 750000)
		val |= CFG_OTG_CURRENT_LIMIT_750mA;

	ret = regmap_update_bits(smb->regmap, CFG_OTG, mask, val);
	if (ret < 0)
		dev_err(smb->dev, "failed to change USB current limit\n");

	return ret;
}

static int smb347_usb_vbus_set_current_limit(struct regulator_dev *rdev,
					     int min_uA, int max_uA)
{
	struct smb347_charger *smb = rdev_get_drvdata(rdev);
	int ret;

	ret = smb347_set_writable(smb, true, true);
	if (ret < 0)
		return ret;

	ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
	smb347_set_writable(smb, false, true);

	return ret;
}

static int smb347_usb_vbus_regulator_enable(struct regulator_dev *rdev)
{
	struct smb347_charger *smb = rdev_get_drvdata(rdev);
	int ret, max_uA;

	ret = smb347_set_writable(smb, true, true);
	if (ret < 0)
		return ret;

	smb347_charging_disable(smb);

	if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
		unsigned int sysok = 0;

		if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_LOW)
			sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;

		/*
		 * VBUS won't be powered if INOK is active, so we need to
		 * manually disable INOK on some platforms.
		 */
		ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
					 CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
		if (ret < 0) {
			dev_err(smb->dev, "failed to disable INOK\n");
			goto done;
		}
	}

	ret = smb347_usb_vbus_get_current_limit(rdev);
	if (ret < 0) {
		dev_err(smb->dev, "failed to get USB VBUS current limit\n");
		goto done;
	}

	max_uA = ret;

	ret = smb347_usb_vbus_set_new_current_limit(smb, 250000);
	if (ret < 0) {
		dev_err(smb->dev, "failed to preset USB VBUS current limit\n");
		goto done;
	}

	ret = regmap_set_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
	if (ret < 0) {
		dev_err(smb->dev, "failed to enable USB VBUS\n");
		goto done;
	}

	smb->usb_vbus_enabled = true;

	ret = smb347_usb_vbus_set_new_current_limit(smb, max_uA);
	if (ret < 0) {
		dev_err(smb->dev, "failed to restore USB VBUS current limit\n");
		goto done;
	}
done:
	smb347_set_writable(smb, false, true);

	return ret;
}

static int smb347_usb_vbus_regulator_disable(struct regulator_dev *rdev)
{
	struct smb347_charger *smb = rdev_get_drvdata(rdev);
	int ret;

	ret = smb347_set_writable(smb, true, true);
	if (ret < 0)
		return ret;

	ret = regmap_clear_bits(smb->regmap, CMD_A, CMD_A_OTG_ENABLED);
	if (ret < 0) {
		dev_err(smb->dev, "failed to disable USB VBUS\n");
		goto done;
	}

	smb->usb_vbus_enabled = false;

	if (device_property_read_bool(&rdev->dev, "summit,needs-inok-toggle")) {
		unsigned int sysok = 0;

		if (smb->inok_polarity == SMB3XX_SYSOK_INOK_ACTIVE_HIGH)
			sysok = CFG_SYSOK_INOK_ACTIVE_HIGH;

		ret = regmap_update_bits(smb->regmap, CFG_SYSOK,
					 CFG_SYSOK_INOK_ACTIVE_HIGH, sysok);
		if (ret < 0) {
			dev_err(smb->dev, "failed to enable INOK\n");
			goto done;
		}
	}

	smb347_start_stop_charging(smb);
done:
	smb347_set_writable(smb, false, true);

	return ret;
}

static const struct regmap_config smb347_regmap = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= SMB347_MAX_REGISTER,
	.volatile_reg	= smb347_volatile_reg,
	.readable_reg	= smb347_readable_reg,
	.cache_type	= REGCACHE_FLAT,
	.num_reg_defaults_raw = SMB347_MAX_REGISTER,
};

static const struct regulator_ops smb347_usb_vbus_regulator_ops = {
	.is_enabled	= regulator_is_enabled_regmap,
	.enable		= smb347_usb_vbus_regulator_enable,
	.disable	= smb347_usb_vbus_regulator_disable,
	.get_current_limit = smb347_usb_vbus_get_current_limit,
	.set_current_limit = smb347_usb_vbus_set_current_limit,
};

static const struct power_supply_desc smb347_mains_desc = {
	.name		= "smb347-mains",
	.type		= POWER_SUPPLY_TYPE_MAINS,
	.get_property	= smb347_get_property,
	.properties	= smb347_properties,
	.num_properties	= ARRAY_SIZE(smb347_properties),
};

static const struct power_supply_desc smb347_usb_desc = {
	.name		= "smb347-usb",
	.type		= POWER_SUPPLY_TYPE_USB,
	.get_property	= smb347_get_property,
	.properties	= smb347_properties,
	.num_properties	= ARRAY_SIZE(smb347_properties),
};

static const struct regulator_desc smb347_usb_vbus_regulator_desc = {
	.name		= "smb347-usb-vbus",
	.of_match	= of_match_ptr("usb-vbus"),
	.ops		= &smb347_usb_vbus_regulator_ops,
	.type		= REGULATOR_VOLTAGE,
	.owner		= THIS_MODULE,
	.enable_reg	= CMD_A,
	.enable_mask	= CMD_A_OTG_ENABLED,
	.enable_val	= CMD_A_OTG_ENABLED,
	.fixed_uV	= 5000000,
	.n_voltages	= 1,
};

static int smb347_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct power_supply_config mains_usb_cfg = {};
	struct regulator_config usb_rdev_cfg = {};
	struct device *dev = &client->dev;
	struct smb347_charger *smb;
	int ret;

	smb = devm_kzalloc(dev, sizeof(*smb), GFP_KERNEL);
	if (!smb)
		return -ENOMEM;
	smb->dev = &client->dev;
	smb->id = id->driver_data;
	i2c_set_clientdata(client, smb);

	smb347_dt_parse_dev_info(smb);
	if (!smb->use_mains && !smb->use_usb)
		return -EINVAL;

	smb->regmap = devm_regmap_init_i2c(client, &smb347_regmap);
	if (IS_ERR(smb->regmap))
		return PTR_ERR(smb->regmap);

	mains_usb_cfg.drv_data = smb;
	mains_usb_cfg.of_node = dev->of_node;
	if (smb->use_mains) {
		smb->mains = devm_power_supply_register(dev, &smb347_mains_desc,
							&mains_usb_cfg);
		if (IS_ERR(smb->mains))
			return PTR_ERR(smb->mains);
	}

	if (smb->use_usb) {
		smb->usb = devm_power_supply_register(dev, &smb347_usb_desc,
						      &mains_usb_cfg);
		if (IS_ERR(smb->usb))
			return PTR_ERR(smb->usb);
	}

	ret = smb347_get_battery_info(smb);
	if (ret)
		return ret;

	ret = smb347_hw_init(smb);
	if (ret < 0)
		return ret;

	ret = smb347_irq_init(smb, client);
	if (ret)
		return ret;

	usb_rdev_cfg.dev = dev;
	usb_rdev_cfg.driver_data = smb;
	usb_rdev_cfg.regmap = smb->regmap;

	smb->usb_rdev = devm_regulator_register(dev,
						&smb347_usb_vbus_regulator_desc,
						&usb_rdev_cfg);
	if (IS_ERR(smb->usb_rdev)) {
		smb347_irq_disable(smb);
		return PTR_ERR(smb->usb_rdev);
	}

	return 0;
}

static int smb347_remove(struct i2c_client *client)
{
	struct smb347_charger *smb = i2c_get_clientdata(client);

	smb347_usb_vbus_regulator_disable(smb->usb_rdev);
	smb347_irq_disable(smb);

	return 0;
}

static void smb347_shutdown(struct i2c_client *client)
{
	smb347_remove(client);
}

static const struct i2c_device_id smb347_id[] = {
	{ "smb345", SMB345 },
	{ "smb347", SMB347 },
	{ "smb358", SMB358 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, smb347_id);

static const struct of_device_id smb3xx_of_match[] = {
	{ .compatible = "summit,smb345" },
	{ .compatible = "summit,smb347" },
	{ .compatible = "summit,smb358" },
	{ },
};
MODULE_DEVICE_TABLE(of, smb3xx_of_match);

static struct i2c_driver smb347_driver = {
	.driver = {
		.name = "smb347",
		.of_match_table = smb3xx_of_match,
	},
	.probe = smb347_probe,
	.remove = smb347_remove,
	.shutdown = smb347_shutdown,
	.id_table = smb347_id,
};
module_i2c_driver(smb347_driver);

MODULE_AUTHOR("Bruce E. Robertson <bruce.e.robertson@intel.com>");
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
MODULE_DESCRIPTION("SMB347 battery charger driver");
MODULE_LICENSE("GPL");