summaryrefslogtreecommitdiff
path: root/drivers/power/supply/max17042_battery.c
blob: 2a8d75e5e9304593d5599c5c26e77adf57653fe4 (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
// SPDX-License-Identifier: GPL-2.0+
//
// Fuel gauge driver for Maxim 17042 / 8966 / 8997
//  Note that Maxim 8966 and 8997 are mfd and this is its subdevice.
//
// Copyright (C) 2011 Samsung Electronics
// MyungJoo Ham <myungjoo.ham@samsung.com>
//
// This driver is based on max17040_battery.c

#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
#include <linux/of.h>
#include <linux/regmap.h>

/* Status register bits */
#define STATUS_POR_BIT         (1 << 1)
#define STATUS_BST_BIT         (1 << 3)
#define STATUS_VMN_BIT         (1 << 8)
#define STATUS_TMN_BIT         (1 << 9)
#define STATUS_SMN_BIT         (1 << 10)
#define STATUS_BI_BIT          (1 << 11)
#define STATUS_VMX_BIT         (1 << 12)
#define STATUS_TMX_BIT         (1 << 13)
#define STATUS_SMX_BIT         (1 << 14)
#define STATUS_BR_BIT          (1 << 15)

/* Interrupt mask bits */
#define CONFIG_ALRT_BIT_ENBL	(1 << 2)
#define STATUS_INTR_SOCMIN_BIT	(1 << 10)
#define STATUS_INTR_SOCMAX_BIT	(1 << 14)

#define VFSOC0_LOCK		0x0000
#define VFSOC0_UNLOCK		0x0080
#define MODEL_UNLOCK1	0X0059
#define MODEL_UNLOCK2	0X00C4
#define MODEL_LOCK1		0X0000
#define MODEL_LOCK2		0X0000

#define dQ_ACC_DIV	0x4
#define dP_ACC_100	0x1900
#define dP_ACC_200	0x3200

#define MAX17042_VMAX_TOLERANCE		50 /* 50 mV */

struct max17042_chip {
	struct i2c_client *client;
	struct regmap *regmap;
	struct power_supply *battery;
	enum max170xx_chip_type chip_type;
	struct max17042_platform_data *pdata;
	struct work_struct work;
	int    init_complete;
};

static enum power_supply_property max17042_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_VOLTAGE_MIN,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_VOLTAGE_OCV,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_COUNTER,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
	POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
	POWER_SUPPLY_PROP_TEMP_MIN,
	POWER_SUPPLY_PROP_TEMP_MAX,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_SCOPE,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
};

static int max17042_get_temperature(struct max17042_chip *chip, int *temp)
{
	int ret;
	u32 data;
	struct regmap *map = chip->regmap;

	ret = regmap_read(map, MAX17042_TEMP, &data);
	if (ret < 0)
		return ret;

	*temp = sign_extend32(data, 15);
	/* The value is converted into deci-centigrade scale */
	/* Units of LSB = 1 / 256 degree Celsius */
	*temp = *temp * 10 / 256;
	return 0;
}

static int max17042_get_status(struct max17042_chip *chip, int *status)
{
	int ret, charge_full, charge_now;
	int avg_current;
	u32 data;

	ret = power_supply_am_i_supplied(chip->battery);
	if (ret < 0) {
		*status = POWER_SUPPLY_STATUS_UNKNOWN;
		return 0;
	}
	if (ret == 0) {
		*status = POWER_SUPPLY_STATUS_DISCHARGING;
		return 0;
	}

	/*
	 * The MAX170xx has builtin end-of-charge detection and will update
	 * FullCAP to match RepCap when it detects end of charging.
	 *
	 * When this cycle the battery gets charged to a higher (calculated)
	 * capacity then the previous cycle then FullCAP will get updated
	 * contineously once end-of-charge detection kicks in, so allow the
	 * 2 to differ a bit.
	 */

	ret = regmap_read(chip->regmap, MAX17042_FullCAP, &charge_full);
	if (ret < 0)
		return ret;

	ret = regmap_read(chip->regmap, MAX17042_RepCap, &charge_now);
	if (ret < 0)
		return ret;

	if ((charge_full - charge_now) <= MAX17042_FULL_THRESHOLD) {
		*status = POWER_SUPPLY_STATUS_FULL;
		return 0;
	}

	/*
	 * Even though we are supplied, we may still be discharging if the
	 * supply is e.g. only delivering 5V 0.5A. Check current if available.
	 */
	if (!chip->pdata->enable_current_sense) {
		*status = POWER_SUPPLY_STATUS_CHARGING;
		return 0;
	}

	ret = regmap_read(chip->regmap, MAX17042_AvgCurrent, &data);
	if (ret < 0)
		return ret;

	avg_current = sign_extend32(data, 15);
	avg_current *= 1562500 / chip->pdata->r_sns;

	if (avg_current > 0)
		*status = POWER_SUPPLY_STATUS_CHARGING;
	else
		*status = POWER_SUPPLY_STATUS_DISCHARGING;

	return 0;
}

static int max17042_get_battery_health(struct max17042_chip *chip, int *health)
{
	int temp, vavg, vbatt, ret;
	u32 val;

	ret = regmap_read(chip->regmap, MAX17042_AvgVCELL, &val);
	if (ret < 0)
		goto health_error;

	/* bits [0-3] unused */
	vavg = val * 625 / 8;
	/* Convert to millivolts */
	vavg /= 1000;

	ret = regmap_read(chip->regmap, MAX17042_VCELL, &val);
	if (ret < 0)
		goto health_error;

	/* bits [0-3] unused */
	vbatt = val * 625 / 8;
	/* Convert to millivolts */
	vbatt /= 1000;

	if (vavg < chip->pdata->vmin) {
		*health = POWER_SUPPLY_HEALTH_DEAD;
		goto out;
	}

	if (vbatt > chip->pdata->vmax + MAX17042_VMAX_TOLERANCE) {
		*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
		goto out;
	}

	ret = max17042_get_temperature(chip, &temp);
	if (ret < 0)
		goto health_error;

	if (temp < chip->pdata->temp_min) {
		*health = POWER_SUPPLY_HEALTH_COLD;
		goto out;
	}

	if (temp > chip->pdata->temp_max) {
		*health = POWER_SUPPLY_HEALTH_OVERHEAT;
		goto out;
	}

	*health = POWER_SUPPLY_HEALTH_GOOD;

out:
	return 0;

health_error:
	return ret;
}

static int max17042_get_property(struct power_supply *psy,
			    enum power_supply_property psp,
			    union power_supply_propval *val)
{
	struct max17042_chip *chip = power_supply_get_drvdata(psy);
	struct regmap *map = chip->regmap;
	int ret;
	u32 data;
	u64 data64;

	if (!chip->init_complete)
		return -EAGAIN;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = max17042_get_status(chip, &val->intval);
		if (ret < 0)
			return ret;
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		ret = regmap_read(map, MAX17042_STATUS, &data);
		if (ret < 0)
			return ret;

		if (data & MAX17042_STATUS_BattAbsent)
			val->intval = 0;
		else
			val->intval = 1;
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
		break;
	case POWER_SUPPLY_PROP_CYCLE_COUNT:
		ret = regmap_read(map, MAX17042_Cycles, &data);
		if (ret < 0)
			return ret;

		val->intval = data;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
		ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
		if (ret < 0)
			return ret;

		val->intval = data >> 8;
		val->intval *= 20000; /* Units of LSB = 20mV */
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
		ret = regmap_read(map, MAX17042_MinMaxVolt, &data);
		if (ret < 0)
			return ret;

		val->intval = (data & 0xff) * 20000; /* Units of 20mV */
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
			ret = regmap_read(map, MAX17042_V_empty, &data);
		else
			ret = regmap_read(map, MAX17047_V_empty, &data);
		if (ret < 0)
			return ret;

		val->intval = data >> 7;
		val->intval *= 10000; /* Units of LSB = 10mV */
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = regmap_read(map, MAX17042_VCELL, &data);
		if (ret < 0)
			return ret;

		val->intval = data * 625 / 8;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		ret = regmap_read(map, MAX17042_AvgVCELL, &data);
		if (ret < 0)
			return ret;

		val->intval = data * 625 / 8;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
		ret = regmap_read(map, MAX17042_OCVInternal, &data);
		if (ret < 0)
			return ret;

		val->intval = data * 625 / 8;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		ret = regmap_read(map, MAX17042_RepSOC, &data);
		if (ret < 0)
			return ret;

		val->intval = data >> 8;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		ret = regmap_read(map, MAX17042_DesignCap, &data);
		if (ret < 0)
			return ret;

		data64 = data * 5000000ll;
		do_div(data64, chip->pdata->r_sns);
		val->intval = data64;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		ret = regmap_read(map, MAX17042_FullCAP, &data);
		if (ret < 0)
			return ret;

		data64 = data * 5000000ll;
		do_div(data64, chip->pdata->r_sns);
		val->intval = data64;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		ret = regmap_read(map, MAX17042_RepCap, &data);
		if (ret < 0)
			return ret;

		data64 = data * 5000000ll;
		do_div(data64, chip->pdata->r_sns);
		val->intval = data64;
		break;
	case POWER_SUPPLY_PROP_CHARGE_COUNTER:
		ret = regmap_read(map, MAX17042_QH, &data);
		if (ret < 0)
			return ret;

		val->intval = data * 1000 / 2;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		ret = max17042_get_temperature(chip, &val->intval);
		if (ret < 0)
			return ret;
		break;
	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
		ret = regmap_read(map, MAX17042_TALRT_Th, &data);
		if (ret < 0)
			return ret;
		/* LSB is Alert Minimum. In deci-centigrade */
		val->intval = sign_extend32(data & 0xff, 7) * 10;
		break;
	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
		ret = regmap_read(map, MAX17042_TALRT_Th, &data);
		if (ret < 0)
			return ret;
		/* MSB is Alert Maximum. In deci-centigrade */
		val->intval = sign_extend32(data >> 8, 7) * 10;
		break;
	case POWER_SUPPLY_PROP_TEMP_MIN:
		val->intval = chip->pdata->temp_min;
		break;
	case POWER_SUPPLY_PROP_TEMP_MAX:
		val->intval = chip->pdata->temp_max;
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = max17042_get_battery_health(chip, &val->intval);
		if (ret < 0)
			return ret;
		break;
	case POWER_SUPPLY_PROP_SCOPE:
		val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		if (chip->pdata->enable_current_sense) {
			ret = regmap_read(map, MAX17042_Current, &data);
			if (ret < 0)
				return ret;

			val->intval = sign_extend32(data, 15);
			val->intval *= 1562500 / chip->pdata->r_sns;
		} else {
			return -EINVAL;
		}
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		if (chip->pdata->enable_current_sense) {
			ret = regmap_read(map, MAX17042_AvgCurrent, &data);
			if (ret < 0)
				return ret;

			val->intval = sign_extend32(data, 15);
			val->intval *= 1562500 / chip->pdata->r_sns;
		} else {
			return -EINVAL;
		}
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int max17042_set_property(struct power_supply *psy,
			    enum power_supply_property psp,
			    const union power_supply_propval *val)
{
	struct max17042_chip *chip = power_supply_get_drvdata(psy);
	struct regmap *map = chip->regmap;
	int ret = 0;
	u32 data;
	int8_t temp;

	switch (psp) {
	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
		ret = regmap_read(map, MAX17042_TALRT_Th, &data);
		if (ret < 0)
			return ret;

		/* Input in deci-centigrade, convert to centigrade */
		temp = val->intval / 10;
		/* force min < max */
		if (temp >= (int8_t)(data >> 8))
			temp = (int8_t)(data >> 8) - 1;
		/* Write both MAX and MIN ALERT */
		data = (data & 0xff00) + temp;
		ret = regmap_write(map, MAX17042_TALRT_Th, data);
		break;
	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
		ret = regmap_read(map, MAX17042_TALRT_Th, &data);
		if (ret < 0)
			return ret;

		/* Input in Deci-Centigrade, convert to centigrade */
		temp = val->intval / 10;
		/* force max > min */
		if (temp <= (int8_t)(data & 0xff))
			temp = (int8_t)(data & 0xff) + 1;
		/* Write both MAX and MIN ALERT */
		data = (data & 0xff) + (temp << 8);
		ret = regmap_write(map, MAX17042_TALRT_Th, data);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static int max17042_property_is_writeable(struct power_supply *psy,
		enum power_supply_property psp)
{
	int ret;

	switch (psp) {
	case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
	case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
		ret = 1;
		break;
	default:
		ret = 0;
	}

	return ret;
}

static void max17042_external_power_changed(struct power_supply *psy)
{
	power_supply_changed(psy);
}

static int max17042_write_verify_reg(struct regmap *map, u8 reg, u32 value)
{
	int retries = 8;
	int ret;
	u32 read_value;

	do {
		ret = regmap_write(map, reg, value);
		regmap_read(map, reg, &read_value);
		if (read_value != value) {
			ret = -EIO;
			retries--;
		}
	} while (retries && read_value != value);

	if (ret < 0)
		pr_err("%s: err %d\n", __func__, ret);

	return ret;
}

static inline void max17042_override_por(struct regmap *map,
					 u8 reg, u16 value)
{
	if (value)
		regmap_write(map, reg, value);
}

static inline void max10742_unlock_model(struct max17042_chip *chip)
{
	struct regmap *map = chip->regmap;

	regmap_write(map, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
	regmap_write(map, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
}

static inline void max10742_lock_model(struct max17042_chip *chip)
{
	struct regmap *map = chip->regmap;

	regmap_write(map, MAX17042_MLOCKReg1, MODEL_LOCK1);
	regmap_write(map, MAX17042_MLOCKReg2, MODEL_LOCK2);
}

static inline void max17042_write_model_data(struct max17042_chip *chip,
					u8 addr, int size)
{
	struct regmap *map = chip->regmap;
	int i;

	for (i = 0; i < size; i++)
		regmap_write(map, addr + i,
			chip->pdata->config_data->cell_char_tbl[i]);
}

static inline void max17042_read_model_data(struct max17042_chip *chip,
					u8 addr, u16 *data, int size)
{
	struct regmap *map = chip->regmap;
	int i;
	u32 tmp;

	for (i = 0; i < size; i++) {
		regmap_read(map, addr + i, &tmp);
		data[i] = (u16)tmp;
	}
}

static inline int max17042_model_data_compare(struct max17042_chip *chip,
					u16 *data1, u16 *data2, int size)
{
	int i;

	if (memcmp(data1, data2, size)) {
		dev_err(&chip->client->dev, "%s compare failed\n", __func__);
		for (i = 0; i < size; i++)
			dev_info(&chip->client->dev, "0x%x, 0x%x",
				data1[i], data2[i]);
		dev_info(&chip->client->dev, "\n");
		return -EINVAL;
	}
	return 0;
}

static int max17042_init_model(struct max17042_chip *chip)
{
	int ret;
	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
	u16 *temp_data;

	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
	if (!temp_data)
		return -ENOMEM;

	max10742_unlock_model(chip);
	max17042_write_model_data(chip, MAX17042_MODELChrTbl,
				table_size);
	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
				table_size);

	ret = max17042_model_data_compare(
		chip,
		chip->pdata->config_data->cell_char_tbl,
		temp_data,
		table_size);

	max10742_lock_model(chip);
	kfree(temp_data);

	return ret;
}

static int max17042_verify_model_lock(struct max17042_chip *chip)
{
	int i;
	int table_size = ARRAY_SIZE(chip->pdata->config_data->cell_char_tbl);
	u16 *temp_data;
	int ret = 0;

	temp_data = kcalloc(table_size, sizeof(*temp_data), GFP_KERNEL);
	if (!temp_data)
		return -ENOMEM;

	max17042_read_model_data(chip, MAX17042_MODELChrTbl, temp_data,
				table_size);
	for (i = 0; i < table_size; i++)
		if (temp_data[i])
			ret = -EINVAL;

	kfree(temp_data);
	return ret;
}

static void max17042_write_config_regs(struct max17042_chip *chip)
{
	struct max17042_config_data *config = chip->pdata->config_data;
	struct regmap *map = chip->regmap;

	regmap_write(map, MAX17042_CONFIG, config->config);
	regmap_write(map, MAX17042_LearnCFG, config->learn_cfg);
	regmap_write(map, MAX17042_FilterCFG,
			config->filter_cfg);
	regmap_write(map, MAX17042_RelaxCFG, config->relax_cfg);
	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17047 ||
			chip->chip_type == MAXIM_DEVICE_TYPE_MAX17050)
		regmap_write(map, MAX17047_FullSOCThr,
						config->full_soc_thresh);
}

static void  max17042_write_custom_regs(struct max17042_chip *chip)
{
	struct max17042_config_data *config = chip->pdata->config_data;
	struct regmap *map = chip->regmap;

	max17042_write_verify_reg(map, MAX17042_RCOMP0, config->rcomp0);
	max17042_write_verify_reg(map, MAX17042_TempCo,	config->tcompc0);
	max17042_write_verify_reg(map, MAX17042_ICHGTerm, config->ichgt_term);
	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042) {
		regmap_write(map, MAX17042_EmptyTempCo,	config->empty_tempco);
		max17042_write_verify_reg(map, MAX17042_K_empty0,
					config->kempty0);
	} else {
		max17042_write_verify_reg(map, MAX17047_QRTbl00,
						config->qrtbl00);
		max17042_write_verify_reg(map, MAX17047_QRTbl10,
						config->qrtbl10);
		max17042_write_verify_reg(map, MAX17047_QRTbl20,
						config->qrtbl20);
		max17042_write_verify_reg(map, MAX17047_QRTbl30,
						config->qrtbl30);
	}
}

static void max17042_update_capacity_regs(struct max17042_chip *chip)
{
	struct max17042_config_data *config = chip->pdata->config_data;
	struct regmap *map = chip->regmap;

	max17042_write_verify_reg(map, MAX17042_FullCAP,
				config->fullcap);
	regmap_write(map, MAX17042_DesignCap, config->design_cap);
	max17042_write_verify_reg(map, MAX17042_FullCAPNom,
				config->fullcapnom);
}

static void max17042_reset_vfsoc0_reg(struct max17042_chip *chip)
{
	unsigned int vfSoc;
	struct regmap *map = chip->regmap;

	regmap_read(map, MAX17042_VFSOC, &vfSoc);
	regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_UNLOCK);
	max17042_write_verify_reg(map, MAX17042_VFSOC0, vfSoc);
	regmap_write(map, MAX17042_VFSOC0Enable, VFSOC0_LOCK);
}

static void max17042_load_new_capacity_params(struct max17042_chip *chip)
{
	u32 full_cap0, rep_cap, dq_acc, vfSoc;
	u32 rem_cap;

	struct max17042_config_data *config = chip->pdata->config_data;
	struct regmap *map = chip->regmap;

	regmap_read(map, MAX17042_FullCAP0, &full_cap0);
	regmap_read(map, MAX17042_VFSOC, &vfSoc);

	/* fg_vfSoc needs to shifted by 8 bits to get the
	 * perc in 1% accuracy, to get the right rem_cap multiply
	 * full_cap0, fg_vfSoc and devide by 100
	 */
	rem_cap = ((vfSoc >> 8) * full_cap0) / 100;
	max17042_write_verify_reg(map, MAX17042_RemCap, rem_cap);

	rep_cap = rem_cap;
	max17042_write_verify_reg(map, MAX17042_RepCap, rep_cap);

	/* Write dQ_acc to 200% of Capacity and dP_acc to 200% */
	dq_acc = config->fullcap / dQ_ACC_DIV;
	max17042_write_verify_reg(map, MAX17042_dQacc, dq_acc);
	max17042_write_verify_reg(map, MAX17042_dPacc, dP_ACC_200);

	max17042_write_verify_reg(map, MAX17042_FullCAP,
			config->fullcap);
	regmap_write(map, MAX17042_DesignCap,
			config->design_cap);
	max17042_write_verify_reg(map, MAX17042_FullCAPNom,
			config->fullcapnom);
	/* Update SOC register with new SOC */
	regmap_write(map, MAX17042_RepSOC, vfSoc);
}

/*
 * Block write all the override values coming from platform data.
 * This function MUST be called before the POR initialization proceedure
 * specified by maxim.
 */
static inline void max17042_override_por_values(struct max17042_chip *chip)
{
	struct regmap *map = chip->regmap;
	struct max17042_config_data *config = chip->pdata->config_data;

	max17042_override_por(map, MAX17042_TGAIN, config->tgain);
	max17042_override_por(map, MAx17042_TOFF, config->toff);
	max17042_override_por(map, MAX17042_CGAIN, config->cgain);
	max17042_override_por(map, MAX17042_COFF, config->coff);

	max17042_override_por(map, MAX17042_VALRT_Th, config->valrt_thresh);
	max17042_override_por(map, MAX17042_TALRT_Th, config->talrt_thresh);
	max17042_override_por(map, MAX17042_SALRT_Th,
						config->soc_alrt_thresh);
	max17042_override_por(map, MAX17042_CONFIG, config->config);
	max17042_override_por(map, MAX17042_SHDNTIMER, config->shdntimer);

	max17042_override_por(map, MAX17042_DesignCap, config->design_cap);
	max17042_override_por(map, MAX17042_ICHGTerm, config->ichgt_term);

	max17042_override_por(map, MAX17042_AtRate, config->at_rate);
	max17042_override_por(map, MAX17042_LearnCFG, config->learn_cfg);
	max17042_override_por(map, MAX17042_FilterCFG, config->filter_cfg);
	max17042_override_por(map, MAX17042_RelaxCFG, config->relax_cfg);
	max17042_override_por(map, MAX17042_MiscCFG, config->misc_cfg);
	max17042_override_por(map, MAX17042_MaskSOC, config->masksoc);

	max17042_override_por(map, MAX17042_FullCAP, config->fullcap);
	max17042_override_por(map, MAX17042_FullCAPNom, config->fullcapnom);
	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
		max17042_override_por(map, MAX17042_SOC_empty,
						config->socempty);
	max17042_override_por(map, MAX17042_LAvg_empty, config->lavg_empty);
	max17042_override_por(map, MAX17042_dQacc, config->dqacc);
	max17042_override_por(map, MAX17042_dPacc, config->dpacc);

	if (chip->chip_type == MAXIM_DEVICE_TYPE_MAX17042)
		max17042_override_por(map, MAX17042_V_empty, config->vempty);
	else
		max17042_override_por(map, MAX17047_V_empty, config->vempty);
	max17042_override_por(map, MAX17042_TempNom, config->temp_nom);
	max17042_override_por(map, MAX17042_TempLim, config->temp_lim);
	max17042_override_por(map, MAX17042_FCTC, config->fctc);
	max17042_override_por(map, MAX17042_RCOMP0, config->rcomp0);
	max17042_override_por(map, MAX17042_TempCo, config->tcompc0);
	if (chip->chip_type) {
		max17042_override_por(map, MAX17042_EmptyTempCo,
						config->empty_tempco);
		max17042_override_por(map, MAX17042_K_empty0,
						config->kempty0);
	}
}

static int max17042_init_chip(struct max17042_chip *chip)
{
	struct regmap *map = chip->regmap;
	int ret;

	max17042_override_por_values(chip);
	/* After Power up, the MAX17042 requires 500mS in order
	 * to perform signal debouncing and initial SOC reporting
	 */
	msleep(500);

	/* Initialize configaration */
	max17042_write_config_regs(chip);

	/* write cell characterization data */
	ret = max17042_init_model(chip);
	if (ret) {
		dev_err(&chip->client->dev, "%s init failed\n",
			__func__);
		return -EIO;
	}

	ret = max17042_verify_model_lock(chip);
	if (ret) {
		dev_err(&chip->client->dev, "%s lock verify failed\n",
			__func__);
		return -EIO;
	}
	/* write custom parameters */
	max17042_write_custom_regs(chip);

	/* update capacity params */
	max17042_update_capacity_regs(chip);

	/* delay must be atleast 350mS to allow VFSOC
	 * to be calculated from the new configuration
	 */
	msleep(350);

	/* reset vfsoc0 reg */
	max17042_reset_vfsoc0_reg(chip);

	/* load new capacity params */
	max17042_load_new_capacity_params(chip);

	/* Init complete, Clear the POR bit */
	regmap_update_bits(map, MAX17042_STATUS, STATUS_POR_BIT, 0x0);
	return 0;
}

static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
{
	struct regmap *map = chip->regmap;
	u32 soc, soc_tr;

	/* program interrupt thesholds such that we should
	 * get interrupt for every 'off' perc change in the soc
	 */
	regmap_read(map, MAX17042_RepSOC, &soc);
	soc >>= 8;
	soc_tr = (soc + off) << 8;
	soc_tr |= (soc - off);
	regmap_write(map, MAX17042_SALRT_Th, soc_tr);
}

static irqreturn_t max17042_thread_handler(int id, void *dev)
{
	struct max17042_chip *chip = dev;
	u32 val;

	regmap_read(chip->regmap, MAX17042_STATUS, &val);
	if ((val & STATUS_INTR_SOCMIN_BIT) ||
		(val & STATUS_INTR_SOCMAX_BIT)) {
		dev_info(&chip->client->dev, "SOC threshold INTR\n");
		max17042_set_soc_threshold(chip, 1);
	}

	power_supply_changed(chip->battery);
	return IRQ_HANDLED;
}

static void max17042_init_worker(struct work_struct *work)
{
	struct max17042_chip *chip = container_of(work,
				struct max17042_chip, work);
	int ret;

	/* Initialize registers according to values from the platform data */
	if (chip->pdata->enable_por_init && chip->pdata->config_data) {
		ret = max17042_init_chip(chip);
		if (ret)
			return;
	}

	chip->init_complete = 1;
}

#ifdef CONFIG_OF
static struct max17042_platform_data *
max17042_get_of_pdata(struct max17042_chip *chip)
{
	struct device *dev = &chip->client->dev;
	struct device_node *np = dev->of_node;
	u32 prop;
	struct max17042_platform_data *pdata;

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return NULL;

	/*
	 * Require current sense resistor value to be specified for
	 * current-sense functionality to be enabled at all.
	 */
	if (of_property_read_u32(np, "maxim,rsns-microohm", &prop) == 0) {
		pdata->r_sns = prop;
		pdata->enable_current_sense = true;
	}

	if (of_property_read_s32(np, "maxim,cold-temp", &pdata->temp_min))
		pdata->temp_min = INT_MIN;
	if (of_property_read_s32(np, "maxim,over-heat-temp", &pdata->temp_max))
		pdata->temp_max = INT_MAX;
	if (of_property_read_s32(np, "maxim,dead-volt", &pdata->vmin))
		pdata->vmin = INT_MIN;
	if (of_property_read_s32(np, "maxim,over-volt", &pdata->vmax))
		pdata->vmax = INT_MAX;

	return pdata;
}
#endif

static struct max17042_reg_data max17047_default_pdata_init_regs[] = {
	/*
	 * Some firmwares do not set FullSOCThr, Enable End-of-Charge Detection
	 * when the voltage FG reports 95%, as recommended in the datasheet.
	 */
	{ MAX17047_FullSOCThr, MAX17042_BATTERY_FULL << 8 },
};

static struct max17042_platform_data *
max17042_get_default_pdata(struct max17042_chip *chip)
{
	struct device *dev = &chip->client->dev;
	struct max17042_platform_data *pdata;
	int ret, misc_cfg;

	/*
	 * The MAX17047 gets used on x86 where we might not have pdata, assume
	 * the firmware will already have initialized the fuel-gauge and provide
	 * default values for the non init bits to make things work.
	 */
	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return pdata;

	if (chip->chip_type != MAXIM_DEVICE_TYPE_MAX17042) {
		pdata->init_data = max17047_default_pdata_init_regs;
		pdata->num_init_data =
			ARRAY_SIZE(max17047_default_pdata_init_regs);
	}

	ret = regmap_read(chip->regmap, MAX17042_MiscCFG, &misc_cfg);
	if (ret < 0)
		return NULL;

	/* If bits 0-1 are set to 3 then only Voltage readings are used */
	if ((misc_cfg & 0x3) == 0x3)
		pdata->enable_current_sense = false;
	else
		pdata->enable_current_sense = true;

	pdata->vmin = MAX17042_DEFAULT_VMIN;
	pdata->vmax = MAX17042_DEFAULT_VMAX;
	pdata->temp_min = MAX17042_DEFAULT_TEMP_MIN;
	pdata->temp_max = MAX17042_DEFAULT_TEMP_MAX;

	return pdata;
}

static struct max17042_platform_data *
max17042_get_pdata(struct max17042_chip *chip)
{
	struct device *dev = &chip->client->dev;

#ifdef CONFIG_OF
	if (dev->of_node)
		return max17042_get_of_pdata(chip);
#endif
	if (dev->platform_data)
		return dev->platform_data;

	return max17042_get_default_pdata(chip);
}

static const struct regmap_config max17042_regmap_config = {
	.reg_bits = 8,
	.val_bits = 16,
	.val_format_endian = REGMAP_ENDIAN_NATIVE,
};

static const struct power_supply_desc max17042_psy_desc = {
	.name		= "max170xx_battery",
	.type		= POWER_SUPPLY_TYPE_BATTERY,
	.get_property	= max17042_get_property,
	.set_property	= max17042_set_property,
	.property_is_writeable	= max17042_property_is_writeable,
	.external_power_changed	= max17042_external_power_changed,
	.properties	= max17042_battery_props,
	.num_properties	= ARRAY_SIZE(max17042_battery_props),
};

static const struct power_supply_desc max17042_no_current_sense_psy_desc = {
	.name		= "max170xx_battery",
	.type		= POWER_SUPPLY_TYPE_BATTERY,
	.get_property	= max17042_get_property,
	.set_property	= max17042_set_property,
	.property_is_writeable	= max17042_property_is_writeable,
	.properties	= max17042_battery_props,
	.num_properties	= ARRAY_SIZE(max17042_battery_props) - 2,
};

static int max17042_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
	const struct power_supply_desc *max17042_desc = &max17042_psy_desc;
	struct power_supply_config psy_cfg = {};
	const struct acpi_device_id *acpi_id = NULL;
	struct device *dev = &client->dev;
	struct max17042_chip *chip;
	int ret;
	int i;
	u32 val;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA))
		return -EIO;

	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->client = client;
	if (id) {
		chip->chip_type = id->driver_data;
	} else {
		acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
		if (!acpi_id)
			return -ENODEV;

		chip->chip_type = acpi_id->driver_data;
	}
	chip->regmap = devm_regmap_init_i2c(client, &max17042_regmap_config);
	if (IS_ERR(chip->regmap)) {
		dev_err(&client->dev, "Failed to initialize regmap\n");
		return -EINVAL;
	}

	chip->pdata = max17042_get_pdata(chip);
	if (!chip->pdata) {
		dev_err(&client->dev, "no platform data provided\n");
		return -EINVAL;
	}

	i2c_set_clientdata(client, chip);
	psy_cfg.drv_data = chip;
	psy_cfg.of_node = dev->of_node;

	/* When current is not measured,
	 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
	if (!chip->pdata->enable_current_sense)
		max17042_desc = &max17042_no_current_sense_psy_desc;

	if (chip->pdata->r_sns == 0)
		chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;

	if (chip->pdata->init_data)
		for (i = 0; i < chip->pdata->num_init_data; i++)
			regmap_write(chip->regmap,
					chip->pdata->init_data[i].addr,
					chip->pdata->init_data[i].data);

	if (!chip->pdata->enable_current_sense) {
		regmap_write(chip->regmap, MAX17042_CGAIN, 0x0000);
		regmap_write(chip->regmap, MAX17042_MiscCFG, 0x0003);
		regmap_write(chip->regmap, MAX17042_LearnCFG, 0x0007);
	}

	chip->battery = devm_power_supply_register(&client->dev, max17042_desc,
						   &psy_cfg);
	if (IS_ERR(chip->battery)) {
		dev_err(&client->dev, "failed: power supply register\n");
		return PTR_ERR(chip->battery);
	}

	if (client->irq) {
		unsigned int flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT;

		/*
		 * On ACPI systems the IRQ may be handled by ACPI-event code,
		 * so we need to share (if the ACPI code is willing to share).
		 */
		if (acpi_id)
			flags |= IRQF_SHARED | IRQF_PROBE_SHARED;

		ret = devm_request_threaded_irq(&client->dev, client->irq,
						NULL,
						max17042_thread_handler, flags,
						chip->battery->desc->name,
						chip);
		if (!ret) {
			regmap_update_bits(chip->regmap, MAX17042_CONFIG,
					CONFIG_ALRT_BIT_ENBL,
					CONFIG_ALRT_BIT_ENBL);
			max17042_set_soc_threshold(chip, 1);
		} else {
			client->irq = 0;
			if (ret != -EBUSY)
				dev_err(&client->dev, "Failed to get IRQ\n");
		}
	}
	/* Not able to update the charge threshold when exceeded? -> disable */
	if (!client->irq)
		regmap_write(chip->regmap, MAX17042_SALRT_Th, 0xff00);

	regmap_read(chip->regmap, MAX17042_STATUS, &val);
	if (val & STATUS_POR_BIT) {
		INIT_WORK(&chip->work, max17042_init_worker);
		schedule_work(&chip->work);
	} else {
		chip->init_complete = 1;
	}

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int max17042_suspend(struct device *dev)
{
	struct max17042_chip *chip = dev_get_drvdata(dev);

	/*
	 * disable the irq and enable irq_wake
	 * capability to the interrupt line.
	 */
	if (chip->client->irq) {
		disable_irq(chip->client->irq);
		enable_irq_wake(chip->client->irq);
	}

	return 0;
}

static int max17042_resume(struct device *dev)
{
	struct max17042_chip *chip = dev_get_drvdata(dev);

	if (chip->client->irq) {
		disable_irq_wake(chip->client->irq);
		enable_irq(chip->client->irq);
		/* re-program the SOC thresholds to 1% change */
		max17042_set_soc_threshold(chip, 1);
	}

	return 0;
}
#endif

static SIMPLE_DEV_PM_OPS(max17042_pm_ops, max17042_suspend,
			max17042_resume);

#ifdef CONFIG_ACPI
static const struct acpi_device_id max17042_acpi_match[] = {
	{ "MAX17047", MAXIM_DEVICE_TYPE_MAX17047 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, max17042_acpi_match);
#endif

#ifdef CONFIG_OF
static const struct of_device_id max17042_dt_match[] = {
	{ .compatible = "maxim,max17042" },
	{ .compatible = "maxim,max17047" },
	{ .compatible = "maxim,max17050" },
	{ },
};
MODULE_DEVICE_TABLE(of, max17042_dt_match);
#endif

static const struct i2c_device_id max17042_id[] = {
	{ "max17042", MAXIM_DEVICE_TYPE_MAX17042 },
	{ "max17047", MAXIM_DEVICE_TYPE_MAX17047 },
	{ "max17050", MAXIM_DEVICE_TYPE_MAX17050 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max17042_id);

static struct i2c_driver max17042_i2c_driver = {
	.driver	= {
		.name	= "max17042",
		.acpi_match_table = ACPI_PTR(max17042_acpi_match),
		.of_match_table = of_match_ptr(max17042_dt_match),
		.pm	= &max17042_pm_ops,
	},
	.probe		= max17042_probe,
	.id_table	= max17042_id,
};
module_i2c_driver(max17042_i2c_driver);

MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("MAX17042 Fuel Gauge");
MODULE_LICENSE("GPL");