summaryrefslogtreecommitdiff
path: root/drivers/regulator/lp872x.c
blob: d86b6a3e750d2badca0f42476311aba54e42b358 (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
/*
 * Copyright 2012 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 *
 * This program 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.
 *
 */

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/regulator/lp872x.h>
#include <linux/regulator/driver.h>
#include <linux/platform_device.h>

/* Registers : LP8720/8725 shared */
#define LP872X_GENERAL_CFG		0x00
#define LP872X_LDO1_VOUT		0x01
#define LP872X_LDO2_VOUT		0x02
#define LP872X_LDO3_VOUT		0x03
#define LP872X_LDO4_VOUT		0x04
#define LP872X_LDO5_VOUT		0x05

/* Registers : LP8720 */
#define LP8720_BUCK_VOUT1		0x06
#define LP8720_BUCK_VOUT2		0x07
#define LP8720_ENABLE			0x08

/* Registers : LP8725 */
#define LP8725_LILO1_VOUT		0x06
#define LP8725_LILO2_VOUT		0x07
#define LP8725_BUCK1_VOUT1		0x08
#define LP8725_BUCK1_VOUT2		0x09
#define LP8725_BUCK2_VOUT1		0x0A
#define LP8725_BUCK2_VOUT2		0x0B
#define LP8725_BUCK_CTRL		0x0C
#define LP8725_LDO_CTRL			0x0D

/* Mask/shift : LP8720/LP8725 shared */
#define LP872X_VOUT_M			0x1F
#define LP872X_START_DELAY_M		0xE0
#define LP872X_START_DELAY_S		5
#define LP872X_EN_LDO1_M		BIT(0)
#define LP872X_EN_LDO2_M		BIT(1)
#define LP872X_EN_LDO3_M		BIT(2)
#define LP872X_EN_LDO4_M		BIT(3)
#define LP872X_EN_LDO5_M		BIT(4)

/* Mask/shift : LP8720 */
#define LP8720_TIMESTEP_S		0		/* Addr 00h */
#define LP8720_TIMESTEP_M		BIT(0)
#define LP8720_EXT_DVS_M		BIT(2)
#define LP8720_BUCK_FPWM_S		5		/* Addr 07h */
#define LP8720_BUCK_FPWM_M		BIT(5)
#define LP8720_EN_BUCK_M		BIT(5)		/* Addr 08h */
#define LP8720_DVS_SEL_M		BIT(7)

/* Mask/shift : LP8725 */
#define LP8725_TIMESTEP_M		0xC0		/* Addr 00h */
#define LP8725_TIMESTEP_S		6
#define LP8725_BUCK1_EN_M		BIT(0)
#define LP8725_DVS1_M			BIT(2)
#define LP8725_DVS2_M			BIT(3)
#define LP8725_BUCK2_EN_M		BIT(4)
#define LP8725_BUCK_CL_M		0xC0		/* Addr 09h, 0Bh */
#define LP8725_BUCK_CL_S		6
#define LP8725_BUCK1_FPWM_S		1		/* Addr 0Ch */
#define LP8725_BUCK1_FPWM_M		BIT(1)
#define LP8725_BUCK2_FPWM_S		5
#define LP8725_BUCK2_FPWM_M		BIT(5)
#define LP8725_EN_LILO1_M		BIT(5)		/* Addr 0Dh */
#define LP8725_EN_LILO2_M		BIT(6)

/* PWM mode */
#define LP872X_FORCE_PWM		1
#define LP872X_AUTO_PWM			0

#define LP8720_NUM_REGULATORS		6
#define LP8725_NUM_REGULATORS		9
#define EXTERN_DVS_USED			0
#define MAX_DELAY			6

/* Default DVS Mode */
#define LP8720_DEFAULT_DVS		0
#define LP8725_DEFAULT_DVS		BIT(2)

/* dump registers in regmap-debugfs */
#define MAX_REGISTERS			0x0F

enum lp872x_id {
	LP8720,
	LP8725,
};

struct lp872x {
	struct regmap *regmap;
	struct device *dev;
	enum lp872x_id chipid;
	struct lp872x_platform_data *pdata;
	struct regulator_dev **regulators;
	int num_regulators;
	enum lp872x_dvs_state dvs_pin;
	int dvs_gpio;
};

/* LP8720/LP8725 shared voltage table for LDOs */
static const unsigned int lp872x_ldo_vtbl[] = {
	1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000, 1550000,
	1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000, 2000000,
	2100000, 2200000, 2300000, 2400000, 2500000, 2600000, 2650000, 2700000,
	2750000, 2800000, 2850000, 2900000, 2950000, 3000000, 3100000, 3300000,
};

/* LP8720 LDO4 voltage table */
static const unsigned int lp8720_ldo4_vtbl[] = {
	 800000,  850000,  900000, 1000000, 1100000, 1200000, 1250000, 1300000,
	1350000, 1400000, 1450000, 1500000, 1550000, 1600000, 1650000, 1700000,
	1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
	2400000, 2500000, 2600000, 2650000, 2700000, 2750000, 2800000, 2850000,
};

/* LP8725 LILO(Low Input Low Output) voltage table */
static const unsigned int lp8725_lilo_vtbl[] = {
	 800000,  850000,  900000,  950000, 1000000, 1050000, 1100000, 1150000,
	1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
	2600000, 2700000, 2800000, 2850000, 2900000, 3000000, 3100000, 3300000,
};

/* LP8720 BUCK voltage table */
#define EXT_R		0	/* external resistor divider */
static const unsigned int lp8720_buck_vtbl[] = {
	  EXT_R,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
	1550000, 1600000, 1650000, 1700000, 1750000, 1800000, 1850000, 1900000,
	1950000, 2000000, 2050000, 2100000, 2150000, 2200000, 2250000, 2300000,
};

/* LP8725 BUCK voltage table */
static const unsigned int lp8725_buck_vtbl[] = {
	 800000,  850000,  900000,  950000, 1000000, 1050000, 1100000, 1150000,
	1200000, 1250000, 1300000, 1350000, 1400000, 1500000, 1600000, 1700000,
	1750000, 1800000, 1850000, 1900000, 2000000, 2100000, 2200000, 2300000,
	2400000, 2500000, 2600000, 2700000, 2800000, 2850000, 2900000, 3000000,
};

/* LP8725 BUCK current limit */
static const unsigned int lp8725_buck_uA[] = {
	460000, 780000, 1050000, 1370000,
};

static int lp872x_read_byte(struct lp872x *lp, u8 addr, u8 *data)
{
	int ret;
	unsigned int val;

	ret = regmap_read(lp->regmap, addr, &val);
	if (ret < 0) {
		dev_err(lp->dev, "failed to read 0x%.2x\n", addr);
		return ret;
	}

	*data = (u8)val;
	return 0;
}

static inline int lp872x_write_byte(struct lp872x *lp, u8 addr, u8 data)
{
	return regmap_write(lp->regmap, addr, data);
}

static inline int lp872x_update_bits(struct lp872x *lp, u8 addr,
				unsigned int mask, u8 data)
{
	return regmap_update_bits(lp->regmap, addr, mask, data);
}

static int _rdev_to_offset(struct regulator_dev *rdev)
{
	enum lp872x_regulator_id id = rdev_get_id(rdev);

	switch (id) {
	case LP8720_ID_LDO1 ... LP8720_ID_BUCK:
		return id;
	case LP8725_ID_LDO1 ... LP8725_ID_BUCK2:
		return id - LP8725_ID_BASE;
	default:
		return -EINVAL;
	}
}

static int lp872x_get_timestep_usec(struct lp872x *lp)
{
	enum lp872x_id chip = lp->chipid;
	u8 val, mask, shift;
	int *time_usec, size, ret;
	int lp8720_time_usec[] = { 25, 50 };
	int lp8725_time_usec[] = { 32, 64, 128, 256 };

	switch (chip) {
	case LP8720:
		mask = LP8720_TIMESTEP_M;
		shift = LP8720_TIMESTEP_S;
		time_usec = &lp8720_time_usec[0];
		size = ARRAY_SIZE(lp8720_time_usec);
		break;
	case LP8725:
		mask = LP8725_TIMESTEP_M;
		shift = LP8725_TIMESTEP_S;
		time_usec = &lp8725_time_usec[0];
		size = ARRAY_SIZE(lp8725_time_usec);
		break;
	default:
		return -EINVAL;
	}

	ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
	if (ret)
		return -EINVAL;

	val = (val & mask) >> shift;
	if (val >= size)
		return -EINVAL;

	return *(time_usec + val);
}

static int lp872x_regulator_enable_time(struct regulator_dev *rdev)
{
	struct lp872x *lp = rdev_get_drvdata(rdev);
	enum lp872x_regulator_id regulator = rdev_get_id(rdev);
	int time_step_us = lp872x_get_timestep_usec(lp);
	int ret, offset;
	u8 addr, val;

	if (time_step_us < 0)
		return -EINVAL;

	switch (regulator) {
	case LP8720_ID_LDO1 ... LP8720_ID_LDO5:
	case LP8725_ID_LDO1 ... LP8725_ID_LILO2:
		offset = _rdev_to_offset(rdev);
		if (offset < 0)
			return -EINVAL;

		addr = LP872X_LDO1_VOUT + offset;
		break;
	case LP8720_ID_BUCK:
		addr = LP8720_BUCK_VOUT1;
		break;
	case LP8725_ID_BUCK1:
		addr = LP8725_BUCK1_VOUT1;
		break;
	case LP8725_ID_BUCK2:
		addr = LP8725_BUCK2_VOUT1;
		break;
	default:
		return -EINVAL;
	}

	ret = lp872x_read_byte(lp, addr, &val);
	if (ret)
		return ret;

	val = (val & LP872X_START_DELAY_M) >> LP872X_START_DELAY_S;

	return val > MAX_DELAY ? 0 : val * time_step_us;
}

static void lp872x_set_dvs(struct lp872x *lp, int gpio)
{
	enum lp872x_dvs_sel dvs_sel = lp->pdata->dvs->vsel;
	enum lp872x_dvs_state state;

	state = dvs_sel == SEL_V1 ? DVS_HIGH : DVS_LOW;
	gpio_set_value(gpio, state);
	lp->dvs_pin = state;
}

static u8 lp872x_select_buck_vout_addr(struct lp872x *lp,
				enum lp872x_regulator_id buck)
{
	u8 val, addr;

	if (lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val))
		return 0;

	switch (buck) {
	case LP8720_ID_BUCK:
		if (val & LP8720_EXT_DVS_M) {
			addr = (lp->dvs_pin == DVS_HIGH) ?
				LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
		} else {
			if (lp872x_read_byte(lp, LP8720_ENABLE, &val))
				return 0;

			addr = val & LP8720_DVS_SEL_M ?
				LP8720_BUCK_VOUT1 : LP8720_BUCK_VOUT2;
		}
		break;
	case LP8725_ID_BUCK1:
		if (val & LP8725_DVS1_M)
			addr = LP8725_BUCK1_VOUT1;
		else
			addr = (lp->dvs_pin == DVS_HIGH) ?
				LP8725_BUCK1_VOUT1 : LP8725_BUCK1_VOUT2;
		break;
	case LP8725_ID_BUCK2:
		addr =  val & LP8725_DVS2_M ?
			LP8725_BUCK2_VOUT1 : LP8725_BUCK2_VOUT2;
		break;
	default:
		return 0;
	}

	return addr;
}

static bool lp872x_is_valid_buck_addr(u8 addr)
{
	switch (addr) {
	case LP8720_BUCK_VOUT1:
	case LP8720_BUCK_VOUT2:
	case LP8725_BUCK1_VOUT1:
	case LP8725_BUCK1_VOUT2:
	case LP8725_BUCK2_VOUT1:
	case LP8725_BUCK2_VOUT2:
		return true;
	default:
		return false;
	}
}

static int lp872x_buck_set_voltage_sel(struct regulator_dev *rdev,
					unsigned selector)
{
	struct lp872x *lp = rdev_get_drvdata(rdev);
	enum lp872x_regulator_id buck = rdev_get_id(rdev);
	u8 addr, mask = LP872X_VOUT_M;
	struct lp872x_dvs *dvs = lp->pdata->dvs;

	if (dvs && gpio_is_valid(dvs->gpio))
		lp872x_set_dvs(lp, dvs->gpio);

	addr = lp872x_select_buck_vout_addr(lp, buck);
	if (!lp872x_is_valid_buck_addr(addr))
		return -EINVAL;

	return lp872x_update_bits(lp, addr, mask, selector);
}

static int lp872x_buck_get_voltage_sel(struct regulator_dev *rdev)
{
	struct lp872x *lp = rdev_get_drvdata(rdev);
	enum lp872x_regulator_id buck = rdev_get_id(rdev);
	u8 addr, val;
	int ret;

	addr = lp872x_select_buck_vout_addr(lp, buck);
	if (!lp872x_is_valid_buck_addr(addr))
		return -EINVAL;

	ret = lp872x_read_byte(lp, addr, &val);
	if (ret)
		return ret;

	return val & LP872X_VOUT_M;
}

static int lp8725_buck_set_current_limit(struct regulator_dev *rdev,
					int min_uA, int max_uA)
{
	struct lp872x *lp = rdev_get_drvdata(rdev);
	enum lp872x_regulator_id buck = rdev_get_id(rdev);
	int i;
	u8 addr;

	switch (buck) {
	case LP8725_ID_BUCK1:
		addr = LP8725_BUCK1_VOUT2;
		break;
	case LP8725_ID_BUCK2:
		addr = LP8725_BUCK2_VOUT2;
		break;
	default:
		return -EINVAL;
	}

	for (i = ARRAY_SIZE(lp8725_buck_uA) - 1 ; i >= 0; i--) {
		if (lp8725_buck_uA[i] >= min_uA &&
			lp8725_buck_uA[i] <= max_uA)
			return lp872x_update_bits(lp, addr,
						  LP8725_BUCK_CL_M,
						  i << LP8725_BUCK_CL_S);
	}

	return -EINVAL;
}

static int lp8725_buck_get_current_limit(struct regulator_dev *rdev)
{
	struct lp872x *lp = rdev_get_drvdata(rdev);
	enum lp872x_regulator_id buck = rdev_get_id(rdev);
	u8 addr, val;
	int ret;

	switch (buck) {
	case LP8725_ID_BUCK1:
		addr = LP8725_BUCK1_VOUT2;
		break;
	case LP8725_ID_BUCK2:
		addr = LP8725_BUCK2_VOUT2;
		break;
	default:
		return -EINVAL;
	}

	ret = lp872x_read_byte(lp, addr, &val);
	if (ret)
		return ret;

	val = (val & LP8725_BUCK_CL_M) >> LP8725_BUCK_CL_S;

	return (val < ARRAY_SIZE(lp8725_buck_uA)) ?
			lp8725_buck_uA[val] : -EINVAL;
}

static int lp872x_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct lp872x *lp = rdev_get_drvdata(rdev);
	enum lp872x_regulator_id buck = rdev_get_id(rdev);
	u8 addr, mask, shift, val;

	switch (buck) {
	case LP8720_ID_BUCK:
		addr = LP8720_BUCK_VOUT2;
		mask = LP8720_BUCK_FPWM_M;
		shift = LP8720_BUCK_FPWM_S;
		break;
	case LP8725_ID_BUCK1:
		addr = LP8725_BUCK_CTRL;
		mask = LP8725_BUCK1_FPWM_M;
		shift = LP8725_BUCK1_FPWM_S;
		break;
	case LP8725_ID_BUCK2:
		addr = LP8725_BUCK_CTRL;
		mask = LP8725_BUCK2_FPWM_M;
		shift = LP8725_BUCK2_FPWM_S;
		break;
	default:
		return -EINVAL;
	}

	if (mode == REGULATOR_MODE_FAST)
		val = LP872X_FORCE_PWM << shift;
	else if (mode == REGULATOR_MODE_NORMAL)
		val = LP872X_AUTO_PWM << shift;
	else
		return -EINVAL;

	return lp872x_update_bits(lp, addr, mask, val);
}

static unsigned int lp872x_buck_get_mode(struct regulator_dev *rdev)
{
	struct lp872x *lp = rdev_get_drvdata(rdev);
	enum lp872x_regulator_id buck = rdev_get_id(rdev);
	u8 addr, mask, val;
	int ret;

	switch (buck) {
	case LP8720_ID_BUCK:
		addr = LP8720_BUCK_VOUT2;
		mask = LP8720_BUCK_FPWM_M;
		break;
	case LP8725_ID_BUCK1:
		addr = LP8725_BUCK_CTRL;
		mask = LP8725_BUCK1_FPWM_M;
		break;
	case LP8725_ID_BUCK2:
		addr = LP8725_BUCK_CTRL;
		mask = LP8725_BUCK2_FPWM_M;
		break;
	default:
		return -EINVAL;
	}

	ret = lp872x_read_byte(lp, addr, &val);
	if (ret)
		return ret;

	return val & mask ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}

static struct regulator_ops lp872x_ldo_ops = {
	.list_voltage = regulator_list_voltage_table,
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.enable_time = lp872x_regulator_enable_time,
};

static struct regulator_ops lp8720_buck_ops = {
	.list_voltage = regulator_list_voltage_table,
	.set_voltage_sel = lp872x_buck_set_voltage_sel,
	.get_voltage_sel = lp872x_buck_get_voltage_sel,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.enable_time = lp872x_regulator_enable_time,
	.set_mode = lp872x_buck_set_mode,
	.get_mode = lp872x_buck_get_mode,
};

static struct regulator_ops lp8725_buck_ops = {
	.list_voltage = regulator_list_voltage_table,
	.set_voltage_sel = lp872x_buck_set_voltage_sel,
	.get_voltage_sel = lp872x_buck_get_voltage_sel,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
	.enable_time = lp872x_regulator_enable_time,
	.set_mode = lp872x_buck_set_mode,
	.get_mode = lp872x_buck_get_mode,
	.set_current_limit = lp8725_buck_set_current_limit,
	.get_current_limit = lp8725_buck_get_current_limit,
};

static struct regulator_desc lp8720_regulator_desc[] = {
	{
		.name = "ldo1",
		.id = LP8720_ID_LDO1,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO1_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8720_ENABLE,
		.enable_mask = LP872X_EN_LDO1_M,
	},
	{
		.name = "ldo2",
		.id = LP8720_ID_LDO2,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO2_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8720_ENABLE,
		.enable_mask = LP872X_EN_LDO2_M,
	},
	{
		.name = "ldo3",
		.id = LP8720_ID_LDO3,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO3_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8720_ENABLE,
		.enable_mask = LP872X_EN_LDO3_M,
	},
	{
		.name = "ldo4",
		.id = LP8720_ID_LDO4,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp8720_ldo4_vtbl),
		.volt_table = lp8720_ldo4_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO4_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8720_ENABLE,
		.enable_mask = LP872X_EN_LDO4_M,
	},
	{
		.name = "ldo5",
		.id = LP8720_ID_LDO5,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO5_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8720_ENABLE,
		.enable_mask = LP872X_EN_LDO5_M,
	},
	{
		.name = "buck",
		.id = LP8720_ID_BUCK,
		.ops = &lp8720_buck_ops,
		.n_voltages = ARRAY_SIZE(lp8720_buck_vtbl),
		.volt_table = lp8720_buck_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.enable_reg = LP8720_ENABLE,
		.enable_mask = LP8720_EN_BUCK_M,
	},
};

static struct regulator_desc lp8725_regulator_desc[] = {
	{
		.name = "ldo1",
		.id = LP8725_ID_LDO1,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO1_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8725_LDO_CTRL,
		.enable_mask = LP872X_EN_LDO1_M,
	},
	{
		.name = "ldo2",
		.id = LP8725_ID_LDO2,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO2_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8725_LDO_CTRL,
		.enable_mask = LP872X_EN_LDO2_M,
	},
	{
		.name = "ldo3",
		.id = LP8725_ID_LDO3,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO3_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8725_LDO_CTRL,
		.enable_mask = LP872X_EN_LDO3_M,
	},
	{
		.name = "ldo4",
		.id = LP8725_ID_LDO4,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO4_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8725_LDO_CTRL,
		.enable_mask = LP872X_EN_LDO4_M,
	},
	{
		.name = "ldo5",
		.id = LP8725_ID_LDO5,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp872x_ldo_vtbl),
		.volt_table = lp872x_ldo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP872X_LDO5_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8725_LDO_CTRL,
		.enable_mask = LP872X_EN_LDO5_M,
	},
	{
		.name = "lilo1",
		.id = LP8725_ID_LILO1,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
		.volt_table = lp8725_lilo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP8725_LILO1_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8725_LDO_CTRL,
		.enable_mask = LP8725_EN_LILO1_M,
	},
	{
		.name = "lilo2",
		.id = LP8725_ID_LILO2,
		.ops = &lp872x_ldo_ops,
		.n_voltages = ARRAY_SIZE(lp8725_lilo_vtbl),
		.volt_table = lp8725_lilo_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.vsel_reg = LP8725_LILO2_VOUT,
		.vsel_mask = LP872X_VOUT_M,
		.enable_reg = LP8725_LDO_CTRL,
		.enable_mask = LP8725_EN_LILO2_M,
	},
	{
		.name = "buck1",
		.id = LP8725_ID_BUCK1,
		.ops = &lp8725_buck_ops,
		.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
		.volt_table = lp8725_buck_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.enable_reg = LP872X_GENERAL_CFG,
		.enable_mask = LP8725_BUCK1_EN_M,
	},
	{
		.name = "buck2",
		.id = LP8725_ID_BUCK2,
		.ops = &lp8725_buck_ops,
		.n_voltages = ARRAY_SIZE(lp8725_buck_vtbl),
		.volt_table = lp8725_buck_vtbl,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.enable_reg = LP872X_GENERAL_CFG,
		.enable_mask = LP8725_BUCK2_EN_M,
	},
};

static int lp872x_check_dvs_validity(struct lp872x *lp)
{
	struct lp872x_dvs *dvs = lp->pdata->dvs;
	u8 val = 0;
	int ret;

	ret = lp872x_read_byte(lp, LP872X_GENERAL_CFG, &val);
	if (ret)
		return ret;

	ret = 0;
	if (lp->chipid == LP8720) {
		if (val & LP8720_EXT_DVS_M)
			ret = dvs ? 0 : -EINVAL;
	} else {
		if ((val & LP8725_DVS1_M) == EXTERN_DVS_USED)
			ret = dvs ? 0 : -EINVAL;
	}

	return ret;
}

static int lp872x_init_dvs(struct lp872x *lp)
{
	int ret, gpio;
	struct lp872x_dvs *dvs = lp->pdata ? lp->pdata->dvs : NULL;
	enum lp872x_dvs_state pinstate;
	u8 mask[] = { LP8720_EXT_DVS_M, LP8725_DVS1_M | LP8725_DVS2_M };
	u8 default_dvs_mode[] = { LP8720_DEFAULT_DVS, LP8725_DEFAULT_DVS };

	if (!dvs)
		goto set_default_dvs_mode;

	ret = lp872x_check_dvs_validity(lp);
	if (ret) {
		dev_warn(lp->dev, "invalid dvs data: %d\n", ret);
		return ret;
	}

	gpio = dvs->gpio;
	if (!gpio_is_valid(gpio)) {
		dev_err(lp->dev, "invalid gpio: %d\n", gpio);
		return -EINVAL;
	}

	pinstate = dvs->init_state;
	ret = devm_gpio_request_one(lp->dev, gpio, pinstate, "LP872X DVS");
	if (ret) {
		dev_err(lp->dev, "gpio request err: %d\n", ret);
		return ret;
	}

	lp->dvs_pin = pinstate;
	lp->dvs_gpio = gpio;

	return 0;

set_default_dvs_mode:
	return lp872x_update_bits(lp, LP872X_GENERAL_CFG, mask[lp->chipid],
				default_dvs_mode[lp->chipid]);
}

static int lp872x_config(struct lp872x *lp)
{
	struct lp872x_platform_data *pdata = lp->pdata;
	int ret;

	if (!pdata->update_config)
		return 0;

	ret = lp872x_write_byte(lp, LP872X_GENERAL_CFG, pdata->general_config);
	if (ret)
		return ret;

	return lp872x_init_dvs(lp);
}

static struct regulator_init_data
*lp872x_find_regulator_init_data(int id, struct lp872x *lp)
{
	struct lp872x_platform_data *pdata = lp->pdata;
	int i;

	if (!pdata)
		return NULL;

	for (i = 0; i < lp->num_regulators; i++) {
		if (pdata->regulator_data[i].id == id)
			return pdata->regulator_data[i].init_data;
	}

	return NULL;
}

static int lp872x_regulator_register(struct lp872x *lp)
{
	struct regulator_desc *desc;
	struct regulator_config cfg = { };
	struct regulator_dev *rdev;
	int i, ret;

	for (i = 0 ; i < lp->num_regulators ; i++) {
		desc = (lp->chipid == LP8720) ? &lp8720_regulator_desc[i] :
						&lp8725_regulator_desc[i];

		cfg.dev = lp->dev;
		cfg.init_data = lp872x_find_regulator_init_data(desc->id, lp);
		cfg.driver_data = lp;
		cfg.regmap = lp->regmap;

		rdev = regulator_register(desc, &cfg);
		if (IS_ERR(rdev)) {
			dev_err(lp->dev, "regulator register err");
			ret =  PTR_ERR(rdev);
			goto err;
		}

		*(lp->regulators + i) = rdev;
	}

	return 0;
err:
	while (--i >= 0) {
		rdev = *(lp->regulators + i);
		regulator_unregister(rdev);
	}
	return ret;
}

static void lp872x_regulator_unregister(struct lp872x *lp)
{
	struct regulator_dev *rdev;
	int i;

	for (i = 0 ; i < lp->num_regulators ; i++) {
		rdev = *(lp->regulators + i);
		regulator_unregister(rdev);
	}
}

static const struct regmap_config lp872x_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = MAX_REGISTERS,
};

static int lp872x_probe(struct i2c_client *cl, const struct i2c_device_id *id)
{
	struct lp872x *lp;
	int ret, size, num_regulators;
	const int lp872x_num_regulators[] = {
		[LP8720] = LP8720_NUM_REGULATORS,
		[LP8725] = LP8725_NUM_REGULATORS,
	};

	lp = devm_kzalloc(&cl->dev, sizeof(struct lp872x), GFP_KERNEL);
	if (!lp)
		goto err_mem;

	num_regulators = lp872x_num_regulators[id->driver_data];
	size = sizeof(struct regulator_dev *) * num_regulators;

	lp->regulators = devm_kzalloc(&cl->dev, size, GFP_KERNEL);
	if (!lp->regulators)
		goto err_mem;

	lp->regmap = devm_regmap_init_i2c(cl, &lp872x_regmap_config);
	if (IS_ERR(lp->regmap)) {
		ret = PTR_ERR(lp->regmap);
		dev_err(&cl->dev, "regmap init i2c err: %d\n", ret);
		goto err_dev;
	}

	lp->dev = &cl->dev;
	lp->pdata = cl->dev.platform_data;
	lp->chipid = id->driver_data;
	lp->num_regulators = num_regulators;
	i2c_set_clientdata(cl, lp);

	ret = lp872x_config(lp);
	if (ret)
		goto err_dev;

	return lp872x_regulator_register(lp);

err_mem:
	return -ENOMEM;
err_dev:
	return ret;
}

static int __devexit lp872x_remove(struct i2c_client *cl)
{
	struct lp872x *lp = i2c_get_clientdata(cl);

	lp872x_regulator_unregister(lp);
	return 0;
}

static const struct i2c_device_id lp872x_ids[] = {
	{"lp8720", LP8720},
	{"lp8725", LP8725},
	{ }
};
MODULE_DEVICE_TABLE(i2c, lp872x_ids);

static struct i2c_driver lp872x_driver = {
	.driver = {
		.name = "lp872x",
		.owner = THIS_MODULE,
	},
	.probe = lp872x_probe,
	.remove = __devexit_p(lp872x_remove),
	.id_table = lp872x_ids,
};

module_i2c_driver(lp872x_driver);

MODULE_DESCRIPTION("TI/National Semiconductor LP872x PMU Regulator Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");