summaryrefslogtreecommitdiffstats
path: root/drivers/power/supply/bq27xxx_battery.c
blob: 44e8aa0f201d699ab3ca90890a9826b85b7d2808 (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
/*
 * BQ27xxx battery driver
 *
 * Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
 * Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
 * Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
 * Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
 *
 * Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
 *
 * This package is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Datasheets:
 * http://www.ti.com/product/bq27000
 * http://www.ti.com/product/bq27200
 * http://www.ti.com/product/bq27010
 * http://www.ti.com/product/bq27210
 * http://www.ti.com/product/bq27500
 * http://www.ti.com/product/bq27510-g1
 * http://www.ti.com/product/bq27510-g3
 * http://www.ti.com/product/bq27520-g4
 * http://www.ti.com/product/bq27530-g1
 * http://www.ti.com/product/bq27531-g1
 * http://www.ti.com/product/bq27541-g1
 * http://www.ti.com/product/bq27542-g1
 * http://www.ti.com/product/bq27546-g1
 * http://www.ti.com/product/bq27742-g1
 * http://www.ti.com/product/bq27545-g1
 * http://www.ti.com/product/bq27421-g1
 * http://www.ti.com/product/bq27425-g1
 * http://www.ti.com/product/bq27411-g1
 * http://www.ti.com/product/bq27621-g1
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/of.h>

#include <linux/power/bq27xxx_battery.h>

#define DRIVER_VERSION		"1.2.0"

#define BQ27XXX_MANUFACTURER	"Texas Instruments"

/* BQ27XXX Flags */
#define BQ27XXX_FLAG_DSC	BIT(0)
#define BQ27XXX_FLAG_SOCF	BIT(1) /* State-of-Charge threshold final */
#define BQ27XXX_FLAG_SOC1	BIT(2) /* State-of-Charge threshold 1 */
#define BQ27XXX_FLAG_FC		BIT(9)
#define BQ27XXX_FLAG_OTD	BIT(14)
#define BQ27XXX_FLAG_OTC	BIT(15)
#define BQ27XXX_FLAG_UT		BIT(14)
#define BQ27XXX_FLAG_OT		BIT(15)

/* BQ27000 has different layout for Flags register */
#define BQ27000_FLAG_EDVF	BIT(0) /* Final End-of-Discharge-Voltage flag */
#define BQ27000_FLAG_EDV1	BIT(1) /* First End-of-Discharge-Voltage flag */
#define BQ27000_FLAG_CI		BIT(4) /* Capacity Inaccurate flag */
#define BQ27000_FLAG_FC		BIT(5)
#define BQ27000_FLAG_CHGS	BIT(7) /* Charge state flag */

#define BQ27XXX_RS			(20) /* Resistor sense mOhm */
#define BQ27XXX_POWER_CONSTANT		(29200) /* 29.2 µV^2 * 1000 */
#define BQ27XXX_CURRENT_CONSTANT	(3570) /* 3.57 µV * 1000 */

#define INVALID_REG_ADDR	0xff

/*
 * bq27xxx_reg_index - Register names
 *
 * These are indexes into a device's register mapping array.
 */

enum bq27xxx_reg_index {
	BQ27XXX_REG_CTRL = 0,	/* Control */
	BQ27XXX_REG_TEMP,	/* Temperature */
	BQ27XXX_REG_INT_TEMP,	/* Internal Temperature */
	BQ27XXX_REG_VOLT,	/* Voltage */
	BQ27XXX_REG_AI,		/* Average Current */
	BQ27XXX_REG_FLAGS,	/* Flags */
	BQ27XXX_REG_TTE,	/* Time-to-Empty */
	BQ27XXX_REG_TTF,	/* Time-to-Full */
	BQ27XXX_REG_TTES,	/* Time-to-Empty Standby */
	BQ27XXX_REG_TTECP,	/* Time-to-Empty at Constant Power */
	BQ27XXX_REG_NAC,	/* Nominal Available Capacity */
	BQ27XXX_REG_FCC,	/* Full Charge Capacity */
	BQ27XXX_REG_CYCT,	/* Cycle Count */
	BQ27XXX_REG_AE,		/* Available Energy */
	BQ27XXX_REG_SOC,	/* State-of-Charge */
	BQ27XXX_REG_DCAP,	/* Design Capacity */
	BQ27XXX_REG_AP,		/* Average Power */
	BQ27XXX_REG_MAX,	/* sentinel */
};

/* Register mappings */
static u8 bq27xxx_regs[][BQ27XXX_REG_MAX] = {
	[BQ27000] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = 0x18,
		[BQ27XXX_REG_TTES] = 0x1c,
		[BQ27XXX_REG_TTECP] = 0x26,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = 0x22,
		[BQ27XXX_REG_SOC] = 0x0b,
		[BQ27XXX_REG_DCAP] = 0x76,
		[BQ27XXX_REG_AP] = 0x24,
	},
	[BQ27010] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = 0x18,
		[BQ27XXX_REG_TTES] = 0x1c,
		[BQ27XXX_REG_TTECP] = 0x26,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_SOC] = 0x0b,
		[BQ27XXX_REG_DCAP] = 0x76,
		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
	},
	[BQ2750X] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = 0x28,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTES] = 0x1a,
		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_SOC] = 0x2c,
		[BQ27XXX_REG_DCAP] = 0x3c,
		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
	},
	[BQ2751X] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = 0x28,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTES] = 0x1a,
		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x1e,
		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_SOC] = 0x20,
		[BQ27XXX_REG_DCAP] = 0x2e,
		[BQ27XXX_REG_AP] = INVALID_REG_ADDR,
	},
	[BQ27500] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = 0x18,
		[BQ27XXX_REG_TTES] = 0x1c,
		[BQ27XXX_REG_TTECP] = 0x26,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = 0x22,
		[BQ27XXX_REG_SOC] = 0x2c,
		[BQ27XXX_REG_DCAP] = 0x3c,
		[BQ27XXX_REG_AP] = 0x24,
	},
	[BQ27510G1] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = 0x18,
		[BQ27XXX_REG_TTES] = 0x1c,
		[BQ27XXX_REG_TTECP] = 0x26,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = 0x22,
		[BQ27XXX_REG_SOC] = 0x2c,
		[BQ27XXX_REG_DCAP] = 0x3c,
		[BQ27XXX_REG_AP] = 0x24,
	},
	[BQ27530] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = 0x32,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_SOC] = 0x2c,
		[BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_AP] = 0x24,
	},
	[BQ27541] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = 0x28,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_SOC] = 0x2c,
		[BQ27XXX_REG_DCAP] = 0x3c,
		[BQ27XXX_REG_AP] = 0x24,
	},
	[BQ27545] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x06,
		[BQ27XXX_REG_INT_TEMP] = 0x28,
		[BQ27XXX_REG_VOLT] = 0x08,
		[BQ27XXX_REG_AI] = 0x14,
		[BQ27XXX_REG_FLAGS] = 0x0a,
		[BQ27XXX_REG_TTE] = 0x16,
		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_NAC] = 0x0c,
		[BQ27XXX_REG_FCC] = 0x12,
		[BQ27XXX_REG_CYCT] = 0x2a,
		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_SOC] = 0x2c,
		[BQ27XXX_REG_DCAP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_AP] = 0x24,
	},
	[BQ27421] = {
		[BQ27XXX_REG_CTRL] = 0x00,
		[BQ27XXX_REG_TEMP] = 0x02,
		[BQ27XXX_REG_INT_TEMP] = 0x1e,
		[BQ27XXX_REG_VOLT] = 0x04,
		[BQ27XXX_REG_AI] = 0x10,
		[BQ27XXX_REG_FLAGS] = 0x06,
		[BQ27XXX_REG_TTE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTF] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTES] = INVALID_REG_ADDR,
		[BQ27XXX_REG_TTECP] = INVALID_REG_ADDR,
		[BQ27XXX_REG_NAC] = 0x08,
		[BQ27XXX_REG_FCC] = 0x0e,
		[BQ27XXX_REG_CYCT] = INVALID_REG_ADDR,
		[BQ27XXX_REG_AE] = INVALID_REG_ADDR,
		[BQ27XXX_REG_SOC] = 0x1c,
		[BQ27XXX_REG_DCAP] = 0x3c,
		[BQ27XXX_REG_AP] = 0x18,
	},
};

static enum power_supply_property bq27000_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_ENERGY_NOW,
	POWER_SUPPLY_PROP_POWER_AVG,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq27010_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq2750x_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq2751x_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq27500_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_ENERGY_NOW,
	POWER_SUPPLY_PROP_POWER_AVG,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq27510g1_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_ENERGY_NOW,
	POWER_SUPPLY_PROP_POWER_AVG,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq27530_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_POWER_AVG,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq27541_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_POWER_AVG,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq27545_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_HEALTH,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_POWER_AVG,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

static enum power_supply_property bq27421_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TECHNOLOGY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_MANUFACTURER,
};

#define BQ27XXX_PROP(_id, _prop)		\
	[_id] = {				\
		.props = _prop,			\
		.size = ARRAY_SIZE(_prop),	\
	}

static struct {
	enum power_supply_property *props;
	size_t size;
} bq27xxx_battery_props[] = {
	BQ27XXX_PROP(BQ27000, bq27000_battery_props),
	BQ27XXX_PROP(BQ27010, bq27010_battery_props),
	BQ27XXX_PROP(BQ2750X, bq2750x_battery_props),
	BQ27XXX_PROP(BQ2751X, bq2751x_battery_props),
	BQ27XXX_PROP(BQ27500, bq27500_battery_props),
	BQ27XXX_PROP(BQ27510G1, bq27510g1_battery_props),
	BQ27XXX_PROP(BQ27530, bq27530_battery_props),
	BQ27XXX_PROP(BQ27541, bq27541_battery_props),
	BQ27XXX_PROP(BQ27545, bq27545_battery_props),
	BQ27XXX_PROP(BQ27421, bq27421_battery_props),
};

static DEFINE_MUTEX(bq27xxx_list_lock);
static LIST_HEAD(bq27xxx_battery_devices);

static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
{
	struct bq27xxx_device_info *di;
	unsigned int prev_val = *(unsigned int *) kp->arg;
	int ret;

	ret = param_set_uint(val, kp);
	if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
		return ret;

	mutex_lock(&bq27xxx_list_lock);
	list_for_each_entry(di, &bq27xxx_battery_devices, list) {
		cancel_delayed_work_sync(&di->work);
		schedule_delayed_work(&di->work, 0);
	}
	mutex_unlock(&bq27xxx_list_lock);

	return ret;
}

static const struct kernel_param_ops param_ops_poll_interval = {
	.get = param_get_uint,
	.set = poll_interval_param_set,
};

static unsigned int poll_interval = 360;
module_param_cb(poll_interval, &param_ops_poll_interval, &poll_interval, 0644);
MODULE_PARM_DESC(poll_interval,
		 "battery poll interval in seconds - 0 disables polling");

/*
 * Common code for BQ27xxx devices
 */

static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
			       bool single)
{
	/* Reports EINVAL for invalid/missing registers */
	if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
		return -EINVAL;

	return di->bus.read(di, di->regs[reg_index], single);
}

/*
 * Return the battery State-of-Charge
 * Or < 0 if something fails.
 */
static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
{
	int soc;

	if (di->chip == BQ27000 || di->chip == BQ27010)
		soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
	else
		soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);

	if (soc < 0)
		dev_dbg(di->dev, "error reading State-of-Charge\n");

	return soc;
}

/*
 * Return a battery charge value in µAh
 * Or < 0 if something fails.
 */
static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
{
	int charge;

	charge = bq27xxx_read(di, reg, false);
	if (charge < 0) {
		dev_dbg(di->dev, "error reading charge register %02x: %d\n",
			reg, charge);
		return charge;
	}

	if (di->chip == BQ27000 || di->chip == BQ27010)
		charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
	else
		charge *= 1000;

	return charge;
}

/*
 * Return the battery Nominal available capacity in µAh
 * Or < 0 if something fails.
 */
static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
{
	int flags;

	if (di->chip == BQ27000 || di->chip == BQ27010) {
		flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
		if (flags >= 0 && (flags & BQ27000_FLAG_CI))
			return -ENODATA;
	}

	return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
}

/*
 * Return the battery Full Charge Capacity in µAh
 * Or < 0 if something fails.
 */
static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
{
	return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
}

/*
 * Return the Design Capacity in µAh
 * Or < 0 if something fails.
 */
static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
{
	int dcap;

	if (di->chip == BQ27000 || di->chip == BQ27010)
		dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
	else
		dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);

	if (dcap < 0) {
		dev_dbg(di->dev, "error reading initial last measured discharge\n");
		return dcap;
	}

	if (di->chip == BQ27000 || di->chip == BQ27010)
		dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
	else
		dcap *= 1000;

	return dcap;
}

/*
 * Return the battery Available energy in µWh
 * Or < 0 if something fails.
 */
static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
{
	int ae;

	ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
	if (ae < 0) {
		dev_dbg(di->dev, "error reading available energy\n");
		return ae;
	}

	if (di->chip == BQ27000 || di->chip == BQ27010)
		ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
	else
		ae *= 1000;

	return ae;
}

/*
 * Return the battery temperature in tenths of degree Kelvin
 * Or < 0 if something fails.
 */
static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
{
	int temp;

	temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
	if (temp < 0) {
		dev_err(di->dev, "error reading temperature\n");
		return temp;
	}

	if (di->chip == BQ27000 || di->chip == BQ27010)
		temp = 5 * temp / 2;

	return temp;
}

/*
 * Return the battery Cycle count total
 * Or < 0 if something fails.
 */
static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
{
	int cyct;

	cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
	if (cyct < 0)
		dev_err(di->dev, "error reading cycle count total\n");

	return cyct;
}

/*
 * Read a time register.
 * Return < 0 if something fails.
 */
static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
{
	int tval;

	tval = bq27xxx_read(di, reg, false);
	if (tval < 0) {
		dev_dbg(di->dev, "error reading time register %02x: %d\n",
			reg, tval);
		return tval;
	}

	if (tval == 65535)
		return -ENODATA;

	return tval * 60;
}

/*
 * Read an average power register.
 * Return < 0 if something fails.
 */
static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
{
	int tval;

	tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
	if (tval < 0) {
		dev_err(di->dev, "error reading average power register  %02x: %d\n",
			BQ27XXX_REG_AP, tval);
		return tval;
	}

	if (di->chip == BQ27000 || di->chip == BQ27010)
		return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
	else
		return tval;
}

/*
 * Returns true if a battery over temperature condition is detected
 */
static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
{
	switch (di->chip) {
	case BQ2750X:
	case BQ2751X:
	case BQ27500:
	case BQ27510G1:
	case BQ27541:
	case BQ27545:
		return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
	case BQ27530:
	case BQ27421:
		return flags & BQ27XXX_FLAG_OT;
	default:
		return false;
	}
}

/*
 * Returns true if a battery under temperature condition is detected
 */
static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
{
	if (di->chip == BQ27530 || di->chip == BQ27421)
		return flags & BQ27XXX_FLAG_UT;

	return false;
}

/*
 * Returns true if a low state of charge condition is detected
 */
static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
{
	if (di->chip == BQ27000 || di->chip == BQ27010)
		return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
	else
		return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
}

/*
 * Read flag register.
 * Return < 0 if something fails.
 */
static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
{
	int flags;
	bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;

	flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
	if (flags < 0) {
		dev_err(di->dev, "error reading flag register:%d\n", flags);
		return flags;
	}

	/* Unlikely but important to return first */
	if (unlikely(bq27xxx_battery_overtemp(di, flags)))
		return POWER_SUPPLY_HEALTH_OVERHEAT;
	if (unlikely(bq27xxx_battery_undertemp(di, flags)))
		return POWER_SUPPLY_HEALTH_COLD;
	if (unlikely(bq27xxx_battery_dead(di, flags)))
		return POWER_SUPPLY_HEALTH_DEAD;

	return POWER_SUPPLY_HEALTH_GOOD;
}

void bq27xxx_battery_update(struct bq27xxx_device_info *di)
{
	struct bq27xxx_reg_cache cache = {0, };
	bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
	bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;

	cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
	if ((cache.flags & 0xff) == 0xff)
		cache.flags = -1; /* read error */
	if (cache.flags >= 0) {
		cache.temperature = bq27xxx_battery_read_temperature(di);
		if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
			dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
			cache.capacity = -ENODATA;
			cache.energy = -ENODATA;
			cache.time_to_empty = -ENODATA;
			cache.time_to_empty_avg = -ENODATA;
			cache.time_to_full = -ENODATA;
			cache.charge_full = -ENODATA;
			cache.health = -ENODATA;
		} else {
			if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
				cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
			if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
				cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
			if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
				cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
			cache.charge_full = bq27xxx_battery_read_fcc(di);
			cache.capacity = bq27xxx_battery_read_soc(di);
			if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
				cache.energy = bq27xxx_battery_read_energy(di);
			cache.health = bq27xxx_battery_read_health(di);
		}
		if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
			cache.cycle_count = bq27xxx_battery_read_cyct(di);
		if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
			cache.power_avg = bq27xxx_battery_read_pwr_avg(di);

		/* We only have to read charge design full once */
		if (di->charge_design_full <= 0)
			di->charge_design_full = bq27xxx_battery_read_dcap(di);
	}

	if (di->cache.capacity != cache.capacity)
		power_supply_changed(di->bat);

	if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
		di->cache = cache;

	di->last_update = jiffies;
}
EXPORT_SYMBOL_GPL(bq27xxx_battery_update);

static void bq27xxx_battery_poll(struct work_struct *work)
{
	struct bq27xxx_device_info *di =
			container_of(work, struct bq27xxx_device_info,
				     work.work);

	bq27xxx_battery_update(di);

	if (poll_interval > 0)
		schedule_delayed_work(&di->work, poll_interval * HZ);
}

/*
 * Return the battery average current in µA
 * Note that current can be negative signed as well
 * Or 0 if something fails.
 */
static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
				   union power_supply_propval *val)
{
	int curr;
	int flags;

	curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
	if (curr < 0) {
		dev_err(di->dev, "error reading current\n");
		return curr;
	}

	if (di->chip == BQ27000 || di->chip == BQ27010) {
		flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
		if (flags & BQ27000_FLAG_CHGS) {
			dev_dbg(di->dev, "negative current!\n");
			curr = -curr;
		}

		val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
	} else {
		/* Other gauges return signed value */
		val->intval = (int)((s16)curr) * 1000;
	}

	return 0;
}

static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
				  union power_supply_propval *val)
{
	int status;

	if (di->chip == BQ27000 || di->chip == BQ27010) {
		if (di->cache.flags & BQ27000_FLAG_FC)
			status = POWER_SUPPLY_STATUS_FULL;
		else if (di->cache.flags & BQ27000_FLAG_CHGS)
			status = POWER_SUPPLY_STATUS_CHARGING;
		else if (power_supply_am_i_supplied(di->bat))
			status = POWER_SUPPLY_STATUS_NOT_CHARGING;
		else
			status = POWER_SUPPLY_STATUS_DISCHARGING;
	} else {
		if (di->cache.flags & BQ27XXX_FLAG_FC)
			status = POWER_SUPPLY_STATUS_FULL;
		else if (di->cache.flags & BQ27XXX_FLAG_DSC)
			status = POWER_SUPPLY_STATUS_DISCHARGING;
		else
			status = POWER_SUPPLY_STATUS_CHARGING;
	}

	val->intval = status;

	return 0;
}

static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
					  union power_supply_propval *val)
{
	int level;

	if (di->chip == BQ27000 || di->chip == BQ27010) {
		if (di->cache.flags & BQ27000_FLAG_FC)
			level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
		else if (di->cache.flags & BQ27000_FLAG_EDV1)
			level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		else if (di->cache.flags & BQ27000_FLAG_EDVF)
			level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
		else
			level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
	} else {
		if (di->cache.flags & BQ27XXX_FLAG_FC)
			level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
		else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
			level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
		else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
			level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
		else
			level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
	}

	val->intval = level;

	return 0;
}

/*
 * Return the battery Voltage in millivolts
 * Or < 0 if something fails.
 */
static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
				   union power_supply_propval *val)
{
	int volt;

	volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
	if (volt < 0) {
		dev_err(di->dev, "error reading voltage\n");
		return volt;
	}

	val->intval = volt * 1000;

	return 0;
}

static int bq27xxx_simple_value(int value,
				union power_supply_propval *val)
{
	if (value < 0)
		return value;

	val->intval = value;

	return 0;
}

static int bq27xxx_battery_get_property(struct power_supply *psy,
					enum power_supply_property psp,
					union power_supply_propval *val)
{
	int ret = 0;
	struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);

	mutex_lock(&di->lock);
	if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
		cancel_delayed_work_sync(&di->work);
		bq27xxx_battery_poll(&di->work.work);
	}
	mutex_unlock(&di->lock);

	if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
		return -ENODEV;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		ret = bq27xxx_battery_status(di, val);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		ret = bq27xxx_battery_voltage(di, val);
		break;
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = di->cache.flags < 0 ? 0 : 1;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		ret = bq27xxx_battery_current(di, val);
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		ret = bq27xxx_simple_value(di->cache.capacity, val);
		break;
	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
		ret = bq27xxx_battery_capacity_level(di, val);
		break;
	case POWER_SUPPLY_PROP_TEMP:
		ret = bq27xxx_simple_value(di->cache.temperature, val);
		if (ret == 0)
			val->intval -= 2731; /* convert decidegree k to c */
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
		ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
		ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
		ret = bq27xxx_simple_value(di->cache.time_to_full, val);
		break;
	case POWER_SUPPLY_PROP_TECHNOLOGY:
		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		ret = bq27xxx_simple_value(di->cache.charge_full, val);
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		ret = bq27xxx_simple_value(di->charge_design_full, val);
		break;
	case POWER_SUPPLY_PROP_CYCLE_COUNT:
		ret = bq27xxx_simple_value(di->cache.cycle_count, val);
		break;
	case POWER_SUPPLY_PROP_ENERGY_NOW:
		ret = bq27xxx_simple_value(di->cache.energy, val);
		break;
	case POWER_SUPPLY_PROP_POWER_AVG:
		ret = bq27xxx_simple_value(di->cache.power_avg, val);
		break;
	case POWER_SUPPLY_PROP_HEALTH:
		ret = bq27xxx_simple_value(di->cache.health, val);
		break;
	case POWER_SUPPLY_PROP_MANUFACTURER:
		val->strval = BQ27XXX_MANUFACTURER;
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

static void bq27xxx_external_power_changed(struct power_supply *psy)
{
	struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);

	cancel_delayed_work_sync(&di->work);
	schedule_delayed_work(&di->work, 0);
}

int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
{
	struct power_supply_desc *psy_desc;
	struct power_supply_config psy_cfg = { .drv_data = di, };

	INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
	mutex_init(&di->lock);
	di->regs = bq27xxx_regs[di->chip];

	psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
	if (!psy_desc)
		return -ENOMEM;

	psy_desc->name = di->name;
	psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
	psy_desc->properties = bq27xxx_battery_props[di->chip].props;
	psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
	psy_desc->get_property = bq27xxx_battery_get_property;
	psy_desc->external_power_changed = bq27xxx_external_power_changed;

	di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
	if (IS_ERR(di->bat)) {
		dev_err(di->dev, "failed to register battery\n");
		return PTR_ERR(di->bat);
	}

	dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);

	bq27xxx_battery_update(di);

	mutex_lock(&bq27xxx_list_lock);
	list_add(&di->list, &bq27xxx_battery_devices);
	mutex_unlock(&bq27xxx_list_lock);

	return 0;
}
EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);

void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
{
	/*
	 * power_supply_unregister call bq27xxx_battery_get_property which
	 * call bq27xxx_battery_poll.
	 * Make sure that bq27xxx_battery_poll will not call
	 * schedule_delayed_work again after unregister (which cause OOPS).
	 */
	poll_interval = 0;

	cancel_delayed_work_sync(&di->work);

	power_supply_unregister(di->bat);

	mutex_lock(&bq27xxx_list_lock);
	list_del(&di->list);
	mutex_unlock(&bq27xxx_list_lock);

	mutex_destroy(&di->lock);
}
EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);

static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
					 bool single)
{
	struct device *dev = di->dev;
	struct bq27xxx_platform_data *pdata = dev->platform_data;
	unsigned int timeout = 3;
	int upper, lower;
	int temp;

	if (!single) {
		/* Make sure the value has not changed in between reading the
		 * lower and the upper part */
		upper = pdata->read(dev, reg + 1);
		do {
			temp = upper;
			if (upper < 0)
				return upper;

			lower = pdata->read(dev, reg);
			if (lower < 0)
				return lower;

			upper = pdata->read(dev, reg + 1);
		} while (temp != upper && --timeout);

		if (timeout == 0)
			return -EIO;

		return (upper << 8) | lower;
	}

	return pdata->read(dev, reg);
}

static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
{
	struct bq27xxx_device_info *di;
	struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;

	if (!pdata) {
		dev_err(&pdev->dev, "no platform_data supplied\n");
		return -EINVAL;
	}

	if (!pdata->read) {
		dev_err(&pdev->dev, "no hdq read callback supplied\n");
		return -EINVAL;
	}

	if (!pdata->chip) {
		dev_err(&pdev->dev, "no device supplied\n");
		return -EINVAL;
	}

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

	platform_set_drvdata(pdev, di);

	di->dev = &pdev->dev;
	di->chip = pdata->chip;
	di->name = pdata->name ?: dev_name(&pdev->dev);
	di->bus.read = bq27xxx_battery_platform_read;

	return bq27xxx_battery_setup(di);
}

static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
{
	struct bq27xxx_device_info *di = platform_get_drvdata(pdev);

	bq27xxx_battery_teardown(di);

	return 0;
}

static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
	{ "bq27000-battery", },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);

#ifdef CONFIG_OF
static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
	{ .compatible = "ti,bq27000" },
	{},
};
MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
#endif

static struct platform_driver bq27xxx_battery_platform_driver = {
	.probe	= bq27xxx_battery_platform_probe,
	.remove = bq27xxx_battery_platform_remove,
	.driver = {
		.name = "bq27000-battery",
		.of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
	},
	.id_table = bq27xxx_battery_platform_id_table,
};
module_platform_driver(bq27xxx_battery_platform_driver);

MODULE_ALIAS("platform:bq27000-battery");

MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
MODULE_LICENSE("GPL");