summaryrefslogtreecommitdiff
path: root/drivers/power/supply/rk817_charger.c
blob: 4f9c1c417916550d76706253347acc7e64d18f3d (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Charger Driver for Rockchip rk817
 *
 * Copyright (c) 2021 Maya Matuszczyk <maccraft123mc@gmail.com>
 *
 * Authors: Maya Matuszczyk <maccraft123mc@gmail.com>
 *	    Chris Morgan <macromorgan@hotmail.com>
 */

#include <asm/unaligned.h>
#include <linux/devm-helpers.h>
#include <linux/mfd/rk808.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>

/* Charging statuses reported by hardware register */
enum rk817_charge_status {
	CHRG_OFF,
	DEAD_CHRG,
	TRICKLE_CHRG,
	CC_OR_CV_CHRG,
	CHARGE_FINISH,
	USB_OVER_VOL,
	BAT_TMP_ERR,
	BAT_TIM_ERR,
};

/*
 * Max charging current read to/written from hardware register.
 * Note how highest value corresponding to 0x7 is the lowest
 * current, this is per the datasheet.
 */
enum rk817_chg_cur {
	CHG_1A,
	CHG_1_5A,
	CHG_2A,
	CHG_2_5A,
	CHG_2_75A,
	CHG_3A,
	CHG_3_5A,
	CHG_0_5A,
};

struct rk817_charger {
	struct device *dev;
	struct rk808 *rk808;

	struct power_supply *bat_ps;
	struct power_supply *chg_ps;
	bool plugged_in;
	bool battery_present;

	/*
	 * voltage_k and voltage_b values are used to calibrate the ADC
	 * voltage readings. While they are documented in the BSP kernel and
	 * datasheet as voltage_k and voltage_b, there is no further
	 * information explaining them in more detail.
	 */

	uint32_t voltage_k;
	uint32_t voltage_b;

	/*
	 * soc - state of charge - like the BSP this is stored as a percentage,
	 * to the thousandth. BSP has a display state of charge (dsoc) and a
	 * remaining state of charge (rsoc). This value will be used for both
	 * purposes here so we don't do any fancy math to try and "smooth" the
	 * charge and just report it as it is. Note for example an soc of 100
	 * is stored as 100000, an soc of 50 is stored as 50000, etc.
	 */
	int soc;

	/*
	 * Capacity of battery when fully charged, equal or less than design
	 * capacity depending upon wear. BSP kernel saves to nvram in mAh,
	 * so this value is in mAh not the standard uAh.
	 */
	int fcc_mah;

	/*
	 * Calibrate the SOC on a fully charged battery, this way we can use
	 * the calibrated SOC value to correct for columb counter drift.
	 */
	bool soc_cal;

	/* Implementation specific immutable properties from device tree */
	int res_div;
	int sleep_enter_current_ua;
	int sleep_filter_current_ua;
	int bat_charge_full_design_uah;
	int bat_voltage_min_design_uv;
	int bat_voltage_max_design_uv;

	/* Values updated periodically by driver for display. */
	int charge_now_uah;
	int volt_avg_uv;
	int cur_avg_ua;
	int max_chg_cur_ua;
	int max_chg_volt_uv;
	int charge_status;
	int charger_input_volt_avg_uv;

	/* Work queue to periodically update values. */
	struct delayed_work work;
};

/* ADC coefficients extracted from BSP kernel */
#define ADC_TO_CURRENT(adc_value, res_div)	\
	(adc_value * 172 / res_div)

#define CURRENT_TO_ADC(current, samp_res)	\
	(current * samp_res / 172)

#define CHARGE_TO_ADC(capacity, res_div)	\
	(capacity * res_div * 3600 / 172 * 1000)

#define ADC_TO_CHARGE_UAH(adc_value, res_div)	\
	(adc_value / 3600 * 172 / res_div)

static int rk817_chg_cur_to_reg(u32 chg_cur_ma)
{
	if (chg_cur_ma >= 3500)
		return CHG_3_5A;
	else if (chg_cur_ma >= 3000)
		return CHG_3A;
	else if (chg_cur_ma >= 2750)
		return CHG_2_75A;
	else if (chg_cur_ma >= 2500)
		return CHG_2_5A;
	else if (chg_cur_ma >= 2000)
		return CHG_2A;
	else if (chg_cur_ma >= 1500)
		return CHG_1_5A;
	else if (chg_cur_ma >= 1000)
		return CHG_1A;
	else if (chg_cur_ma >= 500)
		return CHG_0_5A;
	else
		return -EINVAL;
}

static int rk817_chg_cur_from_reg(u8 reg)
{
	switch (reg) {
	case CHG_0_5A:
		return 500000;
	case CHG_1A:
		return 1000000;
	case CHG_1_5A:
		return 1500000;
	case CHG_2A:
		return 2000000;
	case CHG_2_5A:
		return 2500000;
	case CHG_2_75A:
		return 2750000;
	case CHG_3A:
		return 3000000;
	case CHG_3_5A:
		return 3500000;
	default:
		return -EINVAL;
	}
}

static void rk817_bat_calib_vol(struct rk817_charger *charger)
{
	uint32_t vcalib0 = 0;
	uint32_t vcalib1 = 0;
	u8 bulk_reg[2];

	/* calibrate voltage */
	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB0_H,
			 bulk_reg, 2);
	vcalib0 = get_unaligned_be16(bulk_reg);

	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_VCALIB1_H,
			 bulk_reg, 2);
	vcalib1 = get_unaligned_be16(bulk_reg);

	/* values were taken from BSP kernel */
	charger->voltage_k = (4025 - 2300) * 1000 /
			     ((vcalib1 - vcalib0) ? (vcalib1 - vcalib0) : 1);
	charger->voltage_b = 4025 - (charger->voltage_k * vcalib1) / 1000;
}

static void rk817_bat_calib_cur(struct rk817_charger *charger)
{
	u8 bulk_reg[2];

	/* calibrate current */
	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_IOFFSET_H,
			 bulk_reg, 2);
	regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_CAL_OFFSET_H,
			  bulk_reg, 2);
}

/*
 * note that only the fcc_mah is really used by this driver, the other values
 * are to ensure we can remain backwards compatible with the BSP kernel.
 */
static int rk817_record_battery_nvram_values(struct rk817_charger *charger)
{
	u8 bulk_reg[3];
	int ret, rsoc;

	/*
	 * write the soc value to the nvram location used by the BSP kernel
	 * for the dsoc value.
	 */
	put_unaligned_le24(charger->soc, bulk_reg);
	ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_R1,
				bulk_reg, 3);
	if (ret < 0)
		return ret;
	/*
	 * write the remaining capacity in mah to the nvram location used by
	 * the BSP kernel for the rsoc value.
	 */
	rsoc = (charger->soc * charger->fcc_mah) / 100000;
	put_unaligned_le24(rsoc, bulk_reg);
	ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA0,
				bulk_reg, 3);
	if (ret < 0)
		return ret;
	/* write the fcc_mah in mAh, just as the BSP kernel does. */
	put_unaligned_le24(charger->fcc_mah, bulk_reg);
	ret = regmap_bulk_write(charger->rk808->regmap, RK817_GAS_GAUGE_DATA3,
				bulk_reg, 3);
	if (ret < 0)
		return ret;

	return 0;
}

static int rk817_bat_calib_cap(struct rk817_charger *charger)
{
	struct rk808 *rk808 = charger->rk808;
	int tmp, charge_now, charge_now_adc, volt_avg;
	u8 bulk_reg[4];

	/* Calibrate the soc and fcc on a fully charged battery */

	if (charger->charge_status == CHARGE_FINISH && (!charger->soc_cal)) {
		/*
		 * soc should be 100000 and columb counter should show the full
		 * charge capacity. Note that if the device is unplugged for a
		 * period of several days the columb counter will have a large
		 * margin of error, so setting it back to the full charge on
		 * a completed charge cycle should correct this (my device was
		 * showing 33% battery after 3 days unplugged when it should
		 * have been closer to 95% based on voltage and charge
		 * current).
		 */

		charger->soc = 100000;
		charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah,
					       charger->res_div);
		put_unaligned_be32(charge_now_adc, bulk_reg);
		regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3,
				  bulk_reg, 4);

		charger->soc_cal = 1;
		dev_dbg(charger->dev,
			"Fully charged. SOC is %d, full capacity is %d\n",
			charger->soc, charger->fcc_mah * 1000);
	}

	/*
	 * The columb counter can drift up slightly, so we should correct for
	 * it. But don't correct it until we're at 100% soc.
	 */
	if (charger->charge_status == CHARGE_FINISH && charger->soc_cal) {
		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
				 bulk_reg, 4);
		charge_now_adc = get_unaligned_be32(bulk_reg);
		if (charge_now_adc < 0)
			return charge_now_adc;
		charge_now = ADC_TO_CHARGE_UAH(charge_now_adc,
					       charger->res_div);

		/*
		 * Re-init columb counter with updated values to correct drift.
		 */
		if (charge_now / 1000 > charger->fcc_mah) {
			dev_dbg(charger->dev,
				"Recalibrating columb counter to %d uah\n",
				charge_now);
			/*
			 * Order of operations matters here to ensure we keep
			 * enough precision until the last step to keep from
			 * making needless updates to columb counter.
			 */
			charge_now_adc = CHARGE_TO_ADC(charger->fcc_mah,
					 charger->res_div);
			put_unaligned_be32(charge_now_adc, bulk_reg);
			regmap_bulk_write(rk808->regmap,
					  RK817_GAS_GAUGE_Q_INIT_H3,
					  bulk_reg, 4);
		}
	}

	/*
	 * Calibrate the fully charged capacity when we previously had a full
	 * battery (soc_cal = 1) and are now empty (at or below minimum design
	 * voltage). If our columb counter is still positive, subtract that
	 * from our fcc value to get a calibrated fcc, and if our columb
	 * counter is negative add that to our fcc (but not to exceed our
	 * design capacity).
	 */
	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H,
			 bulk_reg, 2);
	tmp = get_unaligned_be16(bulk_reg);
	volt_avg = (charger->voltage_k * tmp) + 1000 * charger->voltage_b;
	if (volt_avg <= charger->bat_voltage_min_design_uv &&
	    charger->soc_cal) {
		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
				 bulk_reg, 4);
		charge_now_adc = get_unaligned_be32(bulk_reg);
		charge_now = ADC_TO_CHARGE_UAH(charge_now_adc,
					       charger->res_div);
		/*
		 * Note, if charge_now is negative this will add it (what we
		 * want) and if it's positive this will subtract (also what
		 * we want).
		 */
		charger->fcc_mah = charger->fcc_mah - (charge_now / 1000);

		dev_dbg(charger->dev,
			"Recalibrating full charge capacity to %d uah\n",
			charger->fcc_mah * 1000);
	}

	rk817_record_battery_nvram_values(charger);

	return 0;
}

static void rk817_read_props(struct rk817_charger *charger)
{
	int tmp, reg;
	u8 bulk_reg[4];

	/*
	 * Recalibrate voltage and current readings if we need to BSP does both
	 * on CUR_CALIB_UPD, ignoring VOL_CALIB_UPD. Curiously enough, both
	 * documentation and the BSP show that you perform an update if bit 7
	 * is 1, but you clear the status by writing a 1 to bit 7.
	 */
	regmap_read(charger->rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG1, &reg);
	if (reg & RK817_VOL_CUR_CALIB_UPD) {
		rk817_bat_calib_cur(charger);
		rk817_bat_calib_vol(charger);
		regmap_write_bits(charger->rk808->regmap,
				  RK817_GAS_GAUGE_ADC_CONFIG1,
				  RK817_VOL_CUR_CALIB_UPD,
				  RK817_VOL_CUR_CALIB_UPD);
	}

	/* Update reported charge. */
	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
			 bulk_reg, 4);
	tmp = get_unaligned_be32(bulk_reg);
	charger->charge_now_uah = ADC_TO_CHARGE_UAH(tmp, charger->res_div);
	if (charger->charge_now_uah < 0)
		charger->charge_now_uah = 0;
	if (charger->charge_now_uah > charger->fcc_mah * 1000)
		charger->charge_now_uah = charger->fcc_mah * 1000;

	/* Update soc based on reported charge. */
	charger->soc = charger->charge_now_uah * 100 / charger->fcc_mah;

	/* Update reported voltage. */
	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_VOL_H,
			 bulk_reg, 2);
	tmp = get_unaligned_be16(bulk_reg);
	charger->volt_avg_uv = (charger->voltage_k * tmp) + 1000 *
				charger->voltage_b;

	/*
	 * Update reported current. Note value from registers is a signed 16
	 * bit int.
	 */
	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_BAT_CUR_H,
			 bulk_reg, 2);
	tmp = (short int)get_unaligned_be16(bulk_reg);
	charger->cur_avg_ua = ADC_TO_CURRENT(tmp, charger->res_div);

	/*
	 * Update the max charge current. This value shouldn't change, but we
	 * can read it to report what the PMIC says it is instead of simply
	 * returning the default value.
	 */
	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, &reg);
	charger->max_chg_cur_ua =
		rk817_chg_cur_from_reg(reg & RK817_CHRG_CUR_SEL);

	/*
	 * Update max charge voltage. Like the max charge current this value
	 * shouldn't change, but we can report what the PMIC says.
	 */
	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_OUT, &reg);
	charger->max_chg_volt_uv = ((((reg & RK817_CHRG_VOL_SEL) >> 4) *
				    50000) + 4100000);

	/* Check if battery still present. */
	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, &reg);
	charger->battery_present = (reg & RK817_BAT_EXS);

	/* Get which type of charge we are using (if any). */
	regmap_read(charger->rk808->regmap, RK817_PMIC_CHRG_STS, &reg);
	charger->charge_status = (reg >> 4) & 0x07;

	/*
	 * Get charger input voltage. Note that on my example hardware (an
	 * Odroid Go Advance) the voltage of the power connector is measured
	 * on the register labelled USB in the datasheet; I don't know if this
	 * is how it is designed or just a quirk of the implementation. I
	 * believe this will also measure the voltage of the USB output when in
	 * OTG mode, if that is the case we may need to change this in the
	 * future to return 0 if the power supply status is offline (I can't
	 * test this with my current implementation. Also, when the voltage
	 * should be zero sometimes the ADC still shows a single bit (which
	 * would register as 20000uv). When this happens set it to 0.
	 */
	regmap_bulk_read(charger->rk808->regmap, RK817_GAS_GAUGE_USB_VOL_H,
			 bulk_reg, 2);
	reg = get_unaligned_be16(bulk_reg);
	if (reg > 1) {
		tmp = ((charger->voltage_k * reg / 1000 + charger->voltage_b) *
		       60 / 46);
		charger->charger_input_volt_avg_uv = tmp * 1000;
	} else {
		charger->charger_input_volt_avg_uv = 0;
	}

	/* Calibrate battery capacity and soc. */
	rk817_bat_calib_cap(charger);
}

static int rk817_bat_get_prop(struct power_supply *ps,
		enum power_supply_property prop,
		union power_supply_propval *val)
{
	struct rk817_charger *charger = power_supply_get_drvdata(ps);

	switch (prop) {
	case POWER_SUPPLY_PROP_PRESENT:
		val->intval = charger->battery_present;
		break;
	case POWER_SUPPLY_PROP_STATUS:
		if (charger->cur_avg_ua < 0) {
			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
			break;
		}
		switch (charger->charge_status) {
		case CHRG_OFF:
			val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
			break;
		/*
		 * Dead charge is documented, but not explained. I never
		 * observed it but assume it's a pre-charge for a dead
		 * battery.
		 */
		case DEAD_CHRG:
		case TRICKLE_CHRG:
		case CC_OR_CV_CHRG:
			val->intval = POWER_SUPPLY_STATUS_CHARGING;
			break;
		case CHARGE_FINISH:
			val->intval = POWER_SUPPLY_STATUS_FULL;
			break;
		default:
			val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
			return -EINVAL;

		}
		break;
	case POWER_SUPPLY_PROP_CHARGE_TYPE:
		switch (charger->charge_status) {
		case CHRG_OFF:
		case CHARGE_FINISH:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
			break;
		case TRICKLE_CHRG:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
			break;
		case DEAD_CHRG:
		case CC_OR_CV_CHRG:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
			break;
		default:
			val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
			break;
		}
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		val->intval = charger->fcc_mah * 1000;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		val->intval = charger->bat_charge_full_design_uah;
		break;
	case POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN:
		val->intval = 0;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		val->intval = charger->charge_now_uah;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		val->intval = charger->bat_voltage_min_design_uv;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		/* Add 500 so that values like 99999 are 100% not 99%. */
		val->intval = (charger->soc + 500) / 1000;
		if (val->intval > 100)
			val->intval = 100;
		if (val->intval < 0)
			val->intval = 0;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		val->intval = charger->volt_avg_uv;
		break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
		val->intval = charger->cur_avg_ua;
		break;
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
		val->intval = charger->max_chg_cur_ua;
		break;
	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
		val->intval = charger->max_chg_volt_uv;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		val->intval = charger->bat_voltage_max_design_uv;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static int rk817_chg_get_prop(struct power_supply *ps,
			      enum power_supply_property prop,
			      union power_supply_propval *val)
{
	struct rk817_charger *charger = power_supply_get_drvdata(ps);

	switch (prop) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = charger->plugged_in;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
		/* max voltage from datasheet at 5.5v (default 5.0v) */
		val->intval = 5500000;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
		/* min voltage from datasheet at 3.8v (default 5.0v) */
		val->intval = 3800000;
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
		val->intval = charger->charger_input_volt_avg_uv;
		break;
	/*
	 * While it's possible that other implementations could use different
	 * USB types, the current implementation for this PMIC (the Odroid Go
	 * Advance) only uses a dedicated charging port with no rx/tx lines.
	 */
	case POWER_SUPPLY_PROP_USB_TYPE:
		val->intval = POWER_SUPPLY_USB_TYPE_DCP;
		break;
	default:
		return -EINVAL;
	}
	return 0;

}

static irqreturn_t rk817_plug_in_isr(int irq, void *cg)
{
	struct rk817_charger *charger;

	charger = (struct rk817_charger *)cg;
	charger->plugged_in = 1;
	power_supply_changed(charger->chg_ps);
	power_supply_changed(charger->bat_ps);
	/* try to recalibrate capacity if we hit full charge. */
	charger->soc_cal = 0;

	rk817_read_props(charger);

	dev_dbg(charger->dev, "Power Cord Inserted\n");

	return IRQ_HANDLED;
}

static irqreturn_t rk817_plug_out_isr(int irq, void *cg)
{
	struct rk817_charger *charger;
	struct rk808 *rk808;

	charger = (struct rk817_charger *)cg;
	rk808 = charger->rk808;
	charger->plugged_in = 0;
	power_supply_changed(charger->bat_ps);
	power_supply_changed(charger->chg_ps);

	/*
	 * For some reason the bits of RK817_PMIC_CHRG_IN reset whenever the
	 * power cord is unplugged. This was not documented in the BSP kernel
	 * or the datasheet and only discovered by trial and error. Set minimum
	 * USB input voltage to 4.5v and enable USB voltage input limit.
	 */
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
			  RK817_USB_VLIM_SEL, (0x05 << 4));
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN,
			  (0x01 << 7));

	/*
	 * Set average USB input current limit to 1.5A and enable USB current
	 * input limit.
	 */
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
			  RK817_USB_ILIM_SEL, 0x03);
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN,
			  (0x01 << 3));

	rk817_read_props(charger);

	dev_dbg(charger->dev, "Power Cord Removed\n");

	return IRQ_HANDLED;
}

static enum power_supply_property rk817_bat_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_CHARGE_TYPE,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
};

static enum power_supply_property rk817_chg_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_USB_TYPE,
	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
};

static enum power_supply_usb_type rk817_usb_type[] = {
	POWER_SUPPLY_USB_TYPE_DCP,
	POWER_SUPPLY_USB_TYPE_UNKNOWN,
};

static const struct power_supply_desc rk817_bat_desc = {
	.name = "rk817-battery",
	.type = POWER_SUPPLY_TYPE_BATTERY,
	.properties = rk817_bat_props,
	.num_properties = ARRAY_SIZE(rk817_bat_props),
	.get_property = rk817_bat_get_prop,
};

static const struct power_supply_desc rk817_chg_desc = {
	.name = "rk817-charger",
	.type = POWER_SUPPLY_TYPE_USB,
	.usb_types = rk817_usb_type,
	.num_usb_types = ARRAY_SIZE(rk817_usb_type),
	.properties = rk817_chg_props,
	.num_properties = ARRAY_SIZE(rk817_chg_props),
	.get_property = rk817_chg_get_prop,
};

static int rk817_read_battery_nvram_values(struct rk817_charger *charger)
{
	u8 bulk_reg[3];
	int ret;

	/* Read the nvram data for full charge capacity. */
	ret = regmap_bulk_read(charger->rk808->regmap,
			       RK817_GAS_GAUGE_DATA3, bulk_reg, 3);
	if (ret < 0)
		return ret;
	charger->fcc_mah = get_unaligned_le24(bulk_reg);

	/*
	 * Sanity checking for values equal to zero or less than would be
	 * practical for this device (BSP Kernel assumes 500mAH or less) for
	 * practicality purposes. Also check if the value is too large and
	 * correct it.
	 */
	if ((charger->fcc_mah < 500) ||
	   ((charger->fcc_mah * 1000) > charger->bat_charge_full_design_uah)) {
		dev_info(charger->dev,
			 "Invalid NVRAM max charge, setting to %u uAH\n",
			 charger->bat_charge_full_design_uah);
		charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
	}

	/*
	 * Read the nvram for state of charge. Sanity check for values greater
	 * than 100 (10000). If the value is off it should get corrected
	 * automatically when the voltage drops to the min (soc is 0) or when
	 * the battery is full (soc is 100).
	 */
	ret = regmap_bulk_read(charger->rk808->regmap,
			       RK817_GAS_GAUGE_BAT_R1, bulk_reg, 3);
	if (ret < 0)
		return ret;
	charger->soc = get_unaligned_le24(bulk_reg);
	if (charger->soc > 10000)
		charger->soc = 10000;

	return 0;
}

static int
rk817_read_or_set_full_charge_on_boot(struct rk817_charger *charger,
				struct power_supply_battery_info *bat_info)
{
	struct rk808 *rk808 = charger->rk808;
	u8 bulk_reg[4];
	u32 boot_voltage, boot_charge_mah, tmp;
	int ret, reg, off_time;
	bool first_boot;

	/*
	 * Check if the battery is uninitalized. If it is, the columb counter
	 * needs to be set up.
	 */
	ret = regmap_read(rk808->regmap, RK817_GAS_GAUGE_GG_STS, &reg);
	if (ret < 0)
		return ret;
	first_boot = reg & RK817_BAT_CON;
	/*
	 * If the battery is uninitialized, use the poweron voltage and an ocv
	 * lookup to guess our charge. The number won't be very accurate until
	 * we hit either our minimum voltage (0%) or full charge (100%).
	 */
	if (first_boot) {
		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_PWRON_VOL_H,
				 bulk_reg, 2);
		tmp = get_unaligned_be16(bulk_reg);
		boot_voltage = (charger->voltage_k * tmp) +
				1000 * charger->voltage_b;
		/*
		 * Since only implementation has no working thermistor, assume
		 * 20C for OCV lookup. If lookup fails, report error with OCV
		 * table.
		 */
		charger->soc = power_supply_batinfo_ocv2cap(bat_info,
							    boot_voltage,
							    20) * 1000;
		if (charger->soc < 0)
			charger->soc = 0;

		/* Guess that full charge capacity is the design capacity */
		charger->fcc_mah = charger->bat_charge_full_design_uah / 1000;
		/*
		 * Set battery as "set up". BSP driver uses this value even
		 * though datasheet claims it's a read-only value.
		 */
		regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
				  RK817_BAT_CON, 0);
		/* Save nvram values */
		ret = rk817_record_battery_nvram_values(charger);
		if (ret < 0)
			return ret;
	} else {
		ret = rk817_read_battery_nvram_values(charger);
		if (ret < 0)
			return ret;

		regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
				 bulk_reg, 4);
		tmp = get_unaligned_be32(bulk_reg);
		if (tmp < 0)
			tmp = 0;
		boot_charge_mah = ADC_TO_CHARGE_UAH(tmp,
						    charger->res_div) / 1000;
		/*
		 * Check if the columb counter has been off for more than 300
		 * minutes as it tends to drift downward. If so, re-init soc
		 * with the boot voltage instead. Note the unit values for the
		 * OFF_CNT register appear to be in decaminutes and stops
		 * counting at 2550 (0xFF) minutes. BSP kernel used OCV, but
		 * for me occasionally that would show invalid values. Boot
		 * voltage is only accurate for me on first poweron (not
		 * reboots), but we shouldn't ever encounter an OFF_CNT more
		 * than 0 on a reboot anyway.
		 */
		regmap_read(rk808->regmap, RK817_GAS_GAUGE_OFF_CNT, &off_time);
		if (off_time >= 30) {
			regmap_bulk_read(rk808->regmap,
					 RK817_GAS_GAUGE_PWRON_VOL_H,
					 bulk_reg, 2);
			tmp = get_unaligned_be16(bulk_reg);
			boot_voltage = (charger->voltage_k * tmp) +
					1000 * charger->voltage_b;
			charger->soc =
				power_supply_batinfo_ocv2cap(bat_info,
							     boot_voltage,
							     20) * 1000;
		} else {
			charger->soc = (boot_charge_mah * 1000 * 100 /
					charger->fcc_mah);
		}
	}

	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_PWRON_VOL_H,
			 bulk_reg, 2);
	tmp = get_unaligned_be16(bulk_reg);
	boot_voltage = (charger->voltage_k * tmp) + 1000 * charger->voltage_b;
	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_Q_PRES_H3,
			 bulk_reg, 4);
	tmp = get_unaligned_be32(bulk_reg);
	if (tmp < 0)
		tmp = 0;
	boot_charge_mah = ADC_TO_CHARGE_UAH(tmp, charger->res_div) / 1000;
	regmap_bulk_read(rk808->regmap, RK817_GAS_GAUGE_OCV_VOL_H,
			 bulk_reg, 2);
	tmp = get_unaligned_be16(bulk_reg);
	boot_voltage = (charger->voltage_k * tmp) + 1000 * charger->voltage_b;

	/*
	 * Now we have our full charge capacity and soc, init the columb
	 * counter.
	 */
	boot_charge_mah = charger->soc * charger->fcc_mah / 100 / 1000;
	if (boot_charge_mah > charger->fcc_mah)
		boot_charge_mah = charger->fcc_mah;
	tmp = CHARGE_TO_ADC(boot_charge_mah, charger->res_div);
	put_unaligned_be32(tmp, bulk_reg);
	ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_INIT_H3,
			  bulk_reg, 4);
	if (ret < 0)
		return ret;

	/* Set QMAX value to max design capacity. */
	tmp = CHARGE_TO_ADC((charger->bat_charge_full_design_uah / 1000),
			    charger->res_div);
	put_unaligned_be32(tmp, bulk_reg);
	ret = regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_Q_MAX_H3,
				bulk_reg, 4);
	if (ret < 0)
		return ret;

	return 0;
}

static int rk817_battery_init(struct rk817_charger *charger,
			      struct power_supply_battery_info *bat_info)
{
	struct rk808 *rk808 = charger->rk808;
	u32 tmp, max_chg_vol_mv, max_chg_cur_ma;
	u8 max_chg_vol_reg, chg_term_i_reg;
	int ret, chg_term_ma, max_chg_cur_reg;
	u8 bulk_reg[2];

	/* Get initial plug state */
	regmap_read(rk808->regmap, RK817_SYS_STS, &tmp);
	charger->plugged_in = (tmp & RK817_PLUG_IN_STS);

	/*
	 * Turn on all ADC functions to measure battery, USB, and sys voltage,
	 * as well as batt temp. Note only tested implementation so far does
	 * not use a battery with a thermistor.
	 */
	regmap_write(rk808->regmap, RK817_GAS_GAUGE_ADC_CONFIG0, 0xfc);

	/*
	 * Set relax mode voltage sampling interval and ADC offset calibration
	 * interval to 8 minutes to mirror BSP kernel. Set voltage and current
	 * modes to average to mirror BSP kernel.
	 */
	regmap_write(rk808->regmap, RK817_GAS_GAUGE_GG_CON, 0x04);

	/* Calibrate voltage like the BSP does here. */
	rk817_bat_calib_vol(charger);

	/* Write relax threshold, derived from sleep enter current. */
	tmp = CURRENT_TO_ADC(charger->sleep_enter_current_ua,
			     charger->res_div);
	put_unaligned_be16(tmp, bulk_reg);
	regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_RELAX_THRE_H,
			  bulk_reg, 2);

	/* Write sleep sample current, derived from sleep filter current. */
	tmp = CURRENT_TO_ADC(charger->sleep_filter_current_ua,
			     charger->res_div);
	put_unaligned_be16(tmp, bulk_reg);
	regmap_bulk_write(rk808->regmap, RK817_GAS_GAUGE_SLEEP_CON_SAMP_CUR_H,
			  bulk_reg, 2);

	/* Restart battery relax voltage */
	regmap_write_bits(rk808->regmap, RK817_GAS_GAUGE_GG_STS,
			  RK817_RELAX_VOL_UPD, (0x0 << 2));

	/*
	 * Set OCV Threshold Voltage to 127.5mV. This was hard coded like this
	 * in the BSP.
	 */
	regmap_write(rk808->regmap, RK817_GAS_GAUGE_OCV_THRE_VOL, 0xff);

	/*
	 * Set maximum charging voltage to battery max voltage. Trying to be
	 * incredibly safe with these value, as setting them wrong could
	 * overcharge the battery, which would be very bad.
	 */
	max_chg_vol_mv = bat_info->constant_charge_voltage_max_uv / 1000;
	max_chg_cur_ma = bat_info->constant_charge_current_max_ua / 1000;

	if (max_chg_vol_mv < 4100) {
		return dev_err_probe(charger->dev, -EINVAL,
		       "invalid max charger voltage, value %u unsupported\n",
			max_chg_vol_mv * 1000);
	}
	if (max_chg_vol_mv > 4450) {
		dev_info(charger->dev,
			 "Setting max charge voltage to 4450000uv\n");
		max_chg_vol_mv = 4450;
	}

	if (max_chg_cur_ma < 500) {
		return dev_err_probe(charger->dev, -EINVAL,
		       "invalid max charger current, value %u unsupported\n",
		       max_chg_cur_ma * 1000);
	}
	if (max_chg_cur_ma > 3500)
		dev_info(charger->dev,
			 "Setting max charge current to 3500000ua\n");

	/*
	 * Now that the values are sanity checked, if we subtract 4100 from the
	 * max voltage and divide by 50, we conviently get the exact value for
	 * the registers, which are 4.1v, 4.15v, 4.2v, 4.25v, 4.3v, 4.35v,
	 * 4.4v, and 4.45v; these correspond to values 0x00 through 0x07.
	 */
	max_chg_vol_reg = (max_chg_vol_mv - 4100) / 50;

	max_chg_cur_reg = rk817_chg_cur_to_reg(max_chg_cur_ma);

	if (max_chg_vol_reg < 0 || max_chg_vol_reg > 7) {
		return dev_err_probe(charger->dev, -EINVAL,
		       "invalid max charger voltage, value %u unsupported\n",
		       max_chg_vol_mv * 1000);
	}
	if (max_chg_cur_reg < 0 || max_chg_cur_reg > 7) {
		return dev_err_probe(charger->dev, -EINVAL,
		       "invalid max charger current, value %u unsupported\n",
		       max_chg_cur_ma * 1000);
	}

	/*
	 * Write the values to the registers, and deliver an emergency warning
	 * in the event they are not written correctly.
	 */
	ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
				RK817_CHRG_VOL_SEL, (max_chg_vol_reg << 4));
	if (ret) {
		dev_emerg(charger->dev,
			  "Danger, unable to set max charger voltage: %u\n",
			  ret);
	}

	ret = regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_OUT,
				RK817_CHRG_CUR_SEL, max_chg_cur_reg);
	if (ret) {
		dev_emerg(charger->dev,
			  "Danger, unable to set max charger current: %u\n",
			  ret);
	}

	/* Set charge finishing mode to analog */
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
			  RK817_CHRG_TERM_ANA_DIG, (0x0 << 2));

	/*
	 * Set charge finish current, warn if value not in range and keep
	 * default.
	 */
	chg_term_ma = bat_info->charge_term_current_ua / 1000;
	if (chg_term_ma < 150 || chg_term_ma > 400) {
		dev_warn(charger->dev,
			 "Invalid charge termination %u, keeping default\n",
			 chg_term_ma * 1000);
		chg_term_ma = 200;
	}

	/*
	 * Values of 150ma, 200ma, 300ma, and 400ma correspond to 00, 01, 10,
	 * and 11.
	 */
	chg_term_i_reg = (chg_term_ma - 100) / 100;
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_TERM,
			  RK817_CHRG_TERM_ANA_SEL, chg_term_i_reg);

	ret = rk817_read_or_set_full_charge_on_boot(charger, bat_info);
	if (ret < 0)
		return ret;

	/*
	 * Set minimum USB input voltage to 4.5v and enable USB voltage input
	 * limit.
	 */
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
			  RK817_USB_VLIM_SEL, (0x05 << 4));
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_VLIM_EN,
			  (0x01 << 7));

	/*
	 * Set average USB input current limit to 1.5A and enable USB current
	 * input limit.
	 */
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN,
			  RK817_USB_ILIM_SEL, 0x03);
	regmap_write_bits(rk808->regmap, RK817_PMIC_CHRG_IN, RK817_USB_ILIM_EN,
			  (0x01 << 3));

	return 0;
}

static void rk817_charging_monitor(struct work_struct *work)
{
	struct rk817_charger *charger;

	charger = container_of(work, struct rk817_charger, work.work);

	rk817_read_props(charger);

	/* Run every 8 seconds like the BSP driver did. */
	queue_delayed_work(system_wq, &charger->work, msecs_to_jiffies(8000));
}

static int rk817_charger_probe(struct platform_device *pdev)
{
	struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
	struct rk817_charger *charger;
	struct device_node *node;
	struct power_supply_battery_info *bat_info;
	struct device *dev = &pdev->dev;
	struct power_supply_config pscfg = {};
	int plugin_irq, plugout_irq;
	int of_value;
	int ret;

	node = of_get_child_by_name(dev->parent->of_node, "charger");
	if (!node)
		return -ENODEV;

	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
	if (!charger) {
		of_node_put(node);
		return -ENOMEM;
	}

	charger->rk808 = rk808;

	charger->dev = &pdev->dev;
	platform_set_drvdata(pdev, charger);

	rk817_bat_calib_vol(charger);

	pscfg.drv_data = charger;
	pscfg.of_node = node;

	/*
	 * Get sample resistor value. Note only values of 10000 or 20000
	 * microohms are allowed. Schematic for my test implementation (an
	 * Odroid Go Advance) shows a 10 milliohm resistor for reference.
	 */
	ret = of_property_read_u32(node, "rockchip,resistor-sense-micro-ohms",
				   &of_value);
	if (ret < 0) {
		return dev_err_probe(dev, ret,
				     "Error reading sample resistor value\n");
	}
	/*
	 * Store as a 1 or a 2, since all we really use the value for is as a
	 * divisor in some calculations.
	 */
	charger->res_div = (of_value == 20000) ? 2 : 1;

	/*
	 * Get sleep enter current value. Not sure what this value is for
	 * other than to help calibrate the relax threshold.
	 */
	ret = of_property_read_u32(node,
				   "rockchip,sleep-enter-current-microamp",
				   &of_value);
	if (ret < 0) {
		return dev_err_probe(dev, ret,
				     "Error reading sleep enter cur value\n");
	}
	charger->sleep_enter_current_ua = of_value;

	/* Get sleep filter current value */
	ret = of_property_read_u32(node,
				   "rockchip,sleep-filter-current-microamp",
				   &of_value);
	if (ret < 0) {
		return dev_err_probe(dev, ret,
				     "Error reading sleep filter cur value\n");
	}

	charger->sleep_filter_current_ua = of_value;

	charger->bat_ps = devm_power_supply_register(&pdev->dev,
						     &rk817_bat_desc, &pscfg);
	if (IS_ERR(charger->bat_ps))
		return dev_err_probe(dev, -EINVAL,
				     "Battery failed to probe\n");

	charger->chg_ps = devm_power_supply_register(&pdev->dev,
						     &rk817_chg_desc, &pscfg);
	if (IS_ERR(charger->chg_ps))
		return dev_err_probe(dev, -EINVAL,
				     "Charger failed to probe\n");

	ret = power_supply_get_battery_info(charger->bat_ps,
					    &bat_info);
	if (ret) {
		return dev_err_probe(dev, ret,
				     "Unable to get battery info: %d\n", ret);
	}

	if ((bat_info->charge_full_design_uah <= 0) ||
	    (bat_info->voltage_min_design_uv <= 0) ||
	    (bat_info->voltage_max_design_uv <= 0) ||
	    (bat_info->constant_charge_voltage_max_uv <= 0) ||
	    (bat_info->constant_charge_current_max_ua <= 0) ||
	    (bat_info->charge_term_current_ua <= 0)) {
		return dev_err_probe(dev, -EINVAL,
				     "Required bat info missing or invalid\n");
	}

	charger->bat_charge_full_design_uah = bat_info->charge_full_design_uah;
	charger->bat_voltage_min_design_uv = bat_info->voltage_min_design_uv;
	charger->bat_voltage_max_design_uv = bat_info->voltage_max_design_uv;

	/*
	 * Has to run after power_supply_get_battery_info as it depends on some
	 * values discovered from that routine.
	 */
	ret = rk817_battery_init(charger, bat_info);
	if (ret)
		return ret;

	power_supply_put_battery_info(charger->bat_ps, bat_info);

	plugin_irq = platform_get_irq(pdev, 0);
	if (plugin_irq < 0)
		return plugin_irq;

	plugout_irq = platform_get_irq(pdev, 1);
	if (plugout_irq < 0)
		return plugout_irq;

	ret = devm_request_threaded_irq(charger->dev, plugin_irq, NULL,
					rk817_plug_in_isr,
					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					"rk817_plug_in", charger);
	if (ret) {
		return dev_err_probe(&pdev->dev, ret,
				      "plug_in_irq request failed!\n");
	}

	ret = devm_request_threaded_irq(charger->dev, plugout_irq, NULL,
					rk817_plug_out_isr,
					IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					"rk817_plug_out", charger);
	if (ret) {
		return dev_err_probe(&pdev->dev, ret,
				     "plug_out_irq request failed!\n");
	}

	ret = devm_delayed_work_autocancel(&pdev->dev, &charger->work,
					   rk817_charging_monitor);
	if (ret)
		return ret;

	/* Force the first update immediately. */
	mod_delayed_work(system_wq, &charger->work, 0);

	return 0;
}


static struct platform_driver rk817_charger_driver = {
	.probe    = rk817_charger_probe,
	.driver   = {
		.name  = "rk817-charger",
	},
};
module_platform_driver(rk817_charger_driver);

MODULE_DESCRIPTION("Battery power supply driver for RK817 PMIC");
MODULE_AUTHOR("Maya Matuszczyk <maccraft123mc@gmail.com>");
MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
MODULE_LICENSE("GPL");