aboutsummaryrefslogtreecommitdiff
path: root/drivers/regulator/s5m8767.c
blob: 58447db15de14c15ebc30cd24c62c1ad42a11e4f (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
/*
 * s5m8767.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd
 *              http://www.samsung.com
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/bug.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/mfd/s5m87xx/s5m-core.h>
#include <linux/mfd/s5m87xx/s5m-pmic.h>

struct s5m8767_info {
	struct device *dev;
	struct s5m87xx_dev *iodev;
	int num_regulators;
	struct regulator_dev **rdev;

	int ramp_delay;
	bool buck2_ramp;
	bool buck3_ramp;
	bool buck4_ramp;

	bool buck2_gpiodvs;
	bool buck3_gpiodvs;
	bool buck4_gpiodvs;
	u8 buck2_vol[8];
	u8 buck3_vol[8];
	u8 buck4_vol[8];
	int buck_gpios[3];
	int buck_gpioindex;
};

struct s5m_voltage_desc {
	int max;
	int min;
	int step;
};

static const struct s5m_voltage_desc buck_voltage_val1 = {
	.max = 2225000,
	.min =  650000,
	.step =   6250,
};

static const struct s5m_voltage_desc buck_voltage_val2 = {
	.max = 1600000,
	.min =  600000,
	.step =   6250,
};

static const struct s5m_voltage_desc buck_voltage_val3 = {
	.max = 3000000,
	.min =  750000,
	.step =  12500,
};

static const struct s5m_voltage_desc ldo_voltage_val1 = {
	.max = 3950000,
	.min =  800000,
	.step =  50000,
};

static const struct s5m_voltage_desc ldo_voltage_val2 = {
	.max = 2375000,
	.min =  800000,
	.step =  25000,
};

static const struct s5m_voltage_desc *reg_voltage_map[] = {
	[S5M8767_LDO1] = &ldo_voltage_val2,
	[S5M8767_LDO2] = &ldo_voltage_val2,
	[S5M8767_LDO3] = &ldo_voltage_val1,
	[S5M8767_LDO4] = &ldo_voltage_val1,
	[S5M8767_LDO5] = &ldo_voltage_val1,
	[S5M8767_LDO6] = &ldo_voltage_val2,
	[S5M8767_LDO7] = &ldo_voltage_val2,
	[S5M8767_LDO8] = &ldo_voltage_val2,
	[S5M8767_LDO9] = &ldo_voltage_val1,
	[S5M8767_LDO10] = &ldo_voltage_val1,
	[S5M8767_LDO11] = &ldo_voltage_val1,
	[S5M8767_LDO12] = &ldo_voltage_val1,
	[S5M8767_LDO13] = &ldo_voltage_val1,
	[S5M8767_LDO14] = &ldo_voltage_val1,
	[S5M8767_LDO15] = &ldo_voltage_val2,
	[S5M8767_LDO16] = &ldo_voltage_val1,
	[S5M8767_LDO17] = &ldo_voltage_val1,
	[S5M8767_LDO18] = &ldo_voltage_val1,
	[S5M8767_LDO19] = &ldo_voltage_val1,
	[S5M8767_LDO20] = &ldo_voltage_val1,
	[S5M8767_LDO21] = &ldo_voltage_val1,
	[S5M8767_LDO22] = &ldo_voltage_val1,
	[S5M8767_LDO23] = &ldo_voltage_val1,
	[S5M8767_LDO24] = &ldo_voltage_val1,
	[S5M8767_LDO25] = &ldo_voltage_val1,
	[S5M8767_LDO26] = &ldo_voltage_val1,
	[S5M8767_LDO27] = &ldo_voltage_val1,
	[S5M8767_LDO28] = &ldo_voltage_val1,
	[S5M8767_BUCK1] = &buck_voltage_val1,
	[S5M8767_BUCK2] = &buck_voltage_val2,
	[S5M8767_BUCK3] = &buck_voltage_val2,
	[S5M8767_BUCK4] = &buck_voltage_val2,
	[S5M8767_BUCK5] = &buck_voltage_val1,
	[S5M8767_BUCK6] = &buck_voltage_val1,
	[S5M8767_BUCK7] = NULL,
	[S5M8767_BUCK8] = NULL,
	[S5M8767_BUCK9] = &buck_voltage_val3,
};

static int s5m8767_list_voltage(struct regulator_dev *rdev,
				unsigned int selector)
{
	const struct s5m_voltage_desc *desc;
	int reg_id = rdev_get_id(rdev);
	int val;

	if (reg_id >= ARRAY_SIZE(reg_voltage_map) || reg_id < 0)
		return -EINVAL;

	desc = reg_voltage_map[reg_id];
	if (desc == NULL)
		return -EINVAL;

	val = desc->min + desc->step * selector;
	if (val > desc->max)
		return -EINVAL;

	return val;
}

static int s5m8767_get_register(struct regulator_dev *rdev, int *reg)
{
	int reg_id = rdev_get_id(rdev);

	switch (reg_id) {
	case S5M8767_LDO1 ... S5M8767_LDO2:
		*reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);
		break;
	case S5M8767_LDO3 ... S5M8767_LDO28:
		*reg = S5M8767_REG_LDO3CTRL + (reg_id - S5M8767_LDO3);
		break;
	case S5M8767_BUCK1:
		*reg = S5M8767_REG_BUCK1CTRL1;
		break;
	case S5M8767_BUCK2 ... S5M8767_BUCK4:
		*reg = S5M8767_REG_BUCK2CTRL + (reg_id - S5M8767_BUCK2) * 9;
		break;
	case S5M8767_BUCK5:
		*reg = S5M8767_REG_BUCK5CTRL1;
		break;
	case S5M8767_BUCK6 ... S5M8767_BUCK9:
		*reg = S5M8767_REG_BUCK6CTRL1 + (reg_id - S5M8767_BUCK6) * 2;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int s5m8767_reg_is_enabled(struct regulator_dev *rdev)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	int ret, reg;
	int mask = 0xc0, pattern = 0xc0;
	u8 val;

	ret = s5m8767_get_register(rdev, &reg);
	if (ret == -EINVAL)
		return 1;
	else if (ret)
		return ret;

	ret = s5m_reg_read(s5m8767->iodev, reg, &val);
	if (ret)
		return ret;

	return (val & mask) == pattern;
}

static int s5m8767_reg_enable(struct regulator_dev *rdev)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	int ret, reg;
	int mask = 0xc0, pattern = 0xc0;

	ret = s5m8767_get_register(rdev, &reg);
	if (ret)
		return ret;

	return s5m_reg_update(s5m8767->iodev, reg, pattern, mask);
}

static int s5m8767_reg_disable(struct regulator_dev *rdev)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	int ret, reg;
	int  mask = 0xc0, pattern = 0xc0;

	ret = s5m8767_get_register(rdev, &reg);
	if (ret)
		return ret;

	return s5m_reg_update(s5m8767->iodev, reg, ~pattern, mask);
}

static int s5m8767_get_voltage_register(struct regulator_dev *rdev, int *_reg)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	int reg_id = rdev_get_id(rdev);
	int reg;

	switch (reg_id) {
	case S5M8767_LDO1 ... S5M8767_LDO2:
		reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);
		break;
	case S5M8767_LDO3 ... S5M8767_LDO28:
		reg = S5M8767_REG_LDO3CTRL + (reg_id - S5M8767_LDO3);
		break;
	case S5M8767_BUCK1:
		reg = S5M8767_REG_BUCK1CTRL2;
		break;
	case S5M8767_BUCK2:
		reg = S5M8767_REG_BUCK2DVS1;
		if (s5m8767->buck2_gpiodvs)
			reg += s5m8767->buck_gpioindex;
		break;
	case S5M8767_BUCK3:
		reg = S5M8767_REG_BUCK3DVS1;
		if (s5m8767->buck3_gpiodvs)
			reg += s5m8767->buck_gpioindex;
		break;
	case S5M8767_BUCK4:
		reg = S5M8767_REG_BUCK4DVS1;
		if (s5m8767->buck4_gpiodvs)
			reg += s5m8767->buck_gpioindex;
		break;
	case S5M8767_BUCK5:
		reg = S5M8767_REG_BUCK5CTRL2;
		break;
	case S5M8767_BUCK6 ... S5M8767_BUCK9:
		reg = S5M8767_REG_BUCK6CTRL2 + (reg_id - S5M8767_BUCK6) * 2;
		break;
	default:
		return -EINVAL;
	}

	*_reg = reg;

	return 0;
}

static int s5m8767_get_voltage_sel(struct regulator_dev *rdev)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	int reg, mask, ret;
	int reg_id = rdev_get_id(rdev);
	u8 val;

	ret = s5m8767_get_voltage_register(rdev, &reg);
	if (ret)
		return ret;

	mask = (reg_id < S5M8767_BUCK1) ? 0x3f : 0xff;

	ret = s5m_reg_read(s5m8767->iodev, reg, &val);
	if (ret)
		return ret;

	val &= mask;

	return val;
}

static int s5m8767_convert_voltage_to_sel(
		const struct s5m_voltage_desc *desc,
		int min_vol, int max_vol)
{
	int selector = 0;

	if (desc == NULL)
		return -EINVAL;

	if (max_vol < desc->min || min_vol > desc->max)
		return -EINVAL;

	selector = (min_vol - desc->min) / desc->step;

	if (desc->min + desc->step * selector > max_vol)
		return -EINVAL;

	return selector;
}

static int s5m8767_set_voltage(struct regulator_dev *rdev,
				int min_uV, int max_uV, unsigned *selector)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	const struct s5m_voltage_desc *desc;
	int reg_id = rdev_get_id(rdev);
	int reg, mask, ret;
	int i;
	u8 val;

	switch (reg_id) {
	case S5M8767_LDO1 ... S5M8767_LDO28:
		mask = 0x3f;
		break;
	case S5M8767_BUCK1 ... S5M8767_BUCK6:
		mask = 0xff;
		break;
	case S5M8767_BUCK7 ... S5M8767_BUCK8:
		return -EINVAL;
	case S5M8767_BUCK9:
		mask = 0xff;
		break;
	default:
		return -EINVAL;
	}

	desc = reg_voltage_map[reg_id];

	i = s5m8767_convert_voltage_to_sel(desc, min_uV, max_uV);
	if (i < 0)
		return i;

	ret = s5m8767_get_voltage_register(rdev, &reg);
	if (ret)
		return ret;

	s5m_reg_read(s5m8767->iodev, reg, &val);
	val = val & mask;

	ret = s5m_reg_write(s5m8767->iodev, reg, val);
	*selector = i;

	return ret;
}

static inline void s5m8767_set_high(struct s5m8767_info *s5m8767)
{
	int temp_index = s5m8767->buck_gpioindex;

	gpio_set_value(s5m8767->buck_gpios[0], (temp_index >> 2) & 0x1);
	gpio_set_value(s5m8767->buck_gpios[1], (temp_index >> 1) & 0x1);
	gpio_set_value(s5m8767->buck_gpios[2], temp_index & 0x1);
}

static inline void s5m8767_set_low(struct s5m8767_info *s5m8767)
{
	int temp_index = s5m8767->buck_gpioindex;

	gpio_set_value(s5m8767->buck_gpios[2], temp_index & 0x1);
	gpio_set_value(s5m8767->buck_gpios[1], (temp_index >> 1) & 0x1);
	gpio_set_value(s5m8767->buck_gpios[0], (temp_index >> 2) & 0x1);
}

static int s5m8767_set_voltage_buck(struct regulator_dev *rdev,
				    int min_uV, int max_uV, unsigned *selector)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	int reg_id = rdev_get_id(rdev);
	const struct s5m_voltage_desc *desc;
	int new_val, old_val, i = 0;

	if (reg_id < S5M8767_BUCK1 || reg_id > S5M8767_BUCK6)
		return -EINVAL;

	switch (reg_id) {
	case S5M8767_BUCK1:
		return s5m8767_set_voltage(rdev, min_uV, max_uV, selector);
	case S5M8767_BUCK2 ... S5M8767_BUCK4:
		break;
	case S5M8767_BUCK5 ... S5M8767_BUCK6:
		return s5m8767_set_voltage(rdev, min_uV, max_uV, selector);
	case S5M8767_BUCK9:
		return s5m8767_set_voltage(rdev, min_uV, max_uV, selector);
	}

	desc = reg_voltage_map[reg_id];
	new_val = s5m8767_convert_voltage_to_sel(desc, min_uV, max_uV);
	if (new_val < 0)
		return new_val;

	switch (reg_id) {
	case S5M8767_BUCK2:
		if (s5m8767->buck2_gpiodvs) {
			while (s5m8767->buck2_vol[i] != new_val)
				i++;
		} else
			return s5m8767_set_voltage(rdev, min_uV,
						   max_uV, selector);
		break;
	case S5M8767_BUCK3:
		if (s5m8767->buck3_gpiodvs) {
			while (s5m8767->buck3_vol[i] != new_val)
				i++;
		} else
			return s5m8767_set_voltage(rdev, min_uV,
						   max_uV, selector);
		break;
	case S5M8767_BUCK4:
		if (s5m8767->buck3_gpiodvs) {
			while (s5m8767->buck4_vol[i] != new_val)
				i++;
		} else
			return s5m8767_set_voltage(rdev, min_uV,
						   max_uV, selector);
		break;
	}

	old_val = s5m8767->buck_gpioindex;
	s5m8767->buck_gpioindex = i;

	if (i > old_val)
		s5m8767_set_high(s5m8767);
	else
		s5m8767_set_low(s5m8767);

	*selector = new_val;
	return 0;
}

static int s5m8767_set_voltage_time_sel(struct regulator_dev *rdev,
					     unsigned int old_sel,
					     unsigned int new_sel)
{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	const struct s5m_voltage_desc *desc;
	int reg_id = rdev_get_id(rdev);

	desc = reg_voltage_map[reg_id];

	if (old_sel < new_sel)
		return DIV_ROUND_UP(desc->step * (new_sel - old_sel),
					s5m8767->ramp_delay * 1000);
	return 0;
}

static struct regulator_ops s5m8767_ldo_ops = {
	.list_voltage		= s5m8767_list_voltage,
	.is_enabled		= s5m8767_reg_is_enabled,
	.enable			= s5m8767_reg_enable,
	.disable		= s5m8767_reg_disable,
	.get_voltage_sel	= s5m8767_get_voltage_sel,
	.set_voltage		= s5m8767_set_voltage,
	.set_voltage_time_sel	= s5m8767_set_voltage_time_sel,
};

static struct regulator_ops s5m8767_buck_ops = {
	.list_voltage		= s5m8767_list_voltage,
	.is_enabled		= s5m8767_reg_is_enabled,
	.enable			= s5m8767_reg_enable,
	.disable		= s5m8767_reg_disable,
	.get_voltage_sel	= s5m8767_get_voltage_sel,
	.set_voltage		= s5m8767_set_voltage_buck,
	.set_voltage_time_sel	= s5m8767_set_voltage_time_sel,
};

#define regulator_desc_ldo(num)		{	\
	.name		= "LDO"#num,		\
	.id		= S5M8767_LDO##num,	\
	.ops		= &s5m8767_ldo_ops,	\
	.type		= REGULATOR_VOLTAGE,	\
	.owner		= THIS_MODULE,		\
}
#define regulator_desc_buck(num)	{	\
	.name		= "BUCK"#num,		\
	.id		= S5M8767_BUCK##num,	\
	.ops		= &s5m8767_buck_ops,	\
	.type		= REGULATOR_VOLTAGE,	\
	.owner		= THIS_MODULE,		\
}

static struct regulator_desc regulators[] = {
	regulator_desc_ldo(1),
	regulator_desc_ldo(2),
	regulator_desc_ldo(3),
	regulator_desc_ldo(4),
	regulator_desc_ldo(5),
	regulator_desc_ldo(6),
	regulator_desc_ldo(7),
	regulator_desc_ldo(8),
	regulator_desc_ldo(9),
	regulator_desc_ldo(10),
	regulator_desc_ldo(11),
	regulator_desc_ldo(12),
	regulator_desc_ldo(13),
	regulator_desc_ldo(14),
	regulator_desc_ldo(15),
	regulator_desc_ldo(16),
	regulator_desc_ldo(17),
	regulator_desc_ldo(18),
	regulator_desc_ldo(19),
	regulator_desc_ldo(20),
	regulator_desc_ldo(21),
	regulator_desc_ldo(22),
	regulator_desc_ldo(23),
	regulator_desc_ldo(24),
	regulator_desc_ldo(25),
	regulator_desc_ldo(26),
	regulator_desc_ldo(27),
	regulator_desc_ldo(28),
	regulator_desc_buck(1),
	regulator_desc_buck(2),
	regulator_desc_buck(3),
	regulator_desc_buck(4),
	regulator_desc_buck(5),
	regulator_desc_buck(6),
	regulator_desc_buck(7),
	regulator_desc_buck(8),
	regulator_desc_buck(9),
};

static __devinit int s5m8767_pmic_probe(struct platform_device *pdev)
{
	struct s5m87xx_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct s5m_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct regulator_dev **rdev;
	struct s5m8767_info *s5m8767;
	int i, ret, size;

	if (!pdata) {
		dev_err(pdev->dev.parent, "Platform data not supplied\n");
		return -ENODEV;
	}

	if (pdata->buck2_gpiodvs) {
		if (pdata->buck3_gpiodvs || pdata->buck4_gpiodvs) {
			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");
			return -EINVAL;
		}
	}

	if (pdata->buck3_gpiodvs) {
		if (pdata->buck2_gpiodvs || pdata->buck4_gpiodvs) {
			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");
			return -EINVAL;
		}
	}

	if (pdata->buck4_gpiodvs) {
		if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs) {
			dev_err(&pdev->dev, "S5M8767 GPIO DVS NOT VALID\n");
			return -EINVAL;
		}
	}

	s5m8767 = devm_kzalloc(&pdev->dev, sizeof(struct s5m8767_info),
				GFP_KERNEL);
	if (!s5m8767)
		return -ENOMEM;

	size = sizeof(struct regulator_dev *) * (S5M8767_REG_MAX - 2);
	s5m8767->rdev = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
	if (!s5m8767->rdev)
		return -ENOMEM;

	rdev = s5m8767->rdev;
	s5m8767->dev = &pdev->dev;
	s5m8767->iodev = iodev;
	s5m8767->num_regulators = S5M8767_REG_MAX - 2;
	platform_set_drvdata(pdev, s5m8767);

	s5m8767->buck_gpioindex = pdata->buck_default_idx;
	s5m8767->buck2_gpiodvs = pdata->buck2_gpiodvs;
	s5m8767->buck3_gpiodvs = pdata->buck3_gpiodvs;
	s5m8767->buck4_gpiodvs = pdata->buck4_gpiodvs;
	s5m8767->buck_gpios[0] = pdata->buck_gpios[0];
	s5m8767->buck_gpios[1] = pdata->buck_gpios[1];
	s5m8767->buck_gpios[2] = pdata->buck_gpios[2];
	s5m8767->ramp_delay = pdata->buck_ramp_delay;
	s5m8767->buck2_ramp = pdata->buck2_ramp_enable;
	s5m8767->buck3_ramp = pdata->buck3_ramp_enable;
	s5m8767->buck4_ramp = pdata->buck4_ramp_enable;

	for (i = 0; i < 8; i++) {
		if (s5m8767->buck2_gpiodvs) {
			s5m8767->buck2_vol[i] =
				s5m8767_convert_voltage_to_sel(
						&buck_voltage_val2,
						pdata->buck2_voltage[i],
						pdata->buck2_voltage[i] +
						buck_voltage_val2.step);
		}

		if (s5m8767->buck3_gpiodvs) {
			s5m8767->buck3_vol[i] =
				s5m8767_convert_voltage_to_sel(
						&buck_voltage_val2,
						pdata->buck3_voltage[i],
						pdata->buck3_voltage[i] +
						buck_voltage_val2.step);
		}

		if (s5m8767->buck4_gpiodvs) {
			s5m8767->buck4_vol[i] =
				s5m8767_convert_voltage_to_sel(
						&buck_voltage_val2,
						pdata->buck4_voltage[i],
						pdata->buck4_voltage[i] +
						buck_voltage_val2.step);
		}
	}

	if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs ||
		pdata->buck4_gpiodvs) {
		if (gpio_is_valid(pdata->buck_gpios[0]) &&
			gpio_is_valid(pdata->buck_gpios[1]) &&
			gpio_is_valid(pdata->buck_gpios[2])) {
			ret = gpio_request(pdata->buck_gpios[0],
						"S5M8767 SET1");
			if (ret == -EBUSY)
				dev_warn(&pdev->dev, "Duplicated gpio request for SET1\n");

			ret = gpio_request(pdata->buck_gpios[1],
					   "S5M8767 SET2");
			if (ret == -EBUSY)
				dev_warn(&pdev->dev, "Duplicated gpio request for SET2\n");

			ret = gpio_request(pdata->buck_gpios[2],
					   "S5M8767 SET3");
			if (ret == -EBUSY)
				dev_warn(&pdev->dev, "Duplicated gpio request for SET3\n");
			/* SET1 GPIO */
			gpio_direction_output(pdata->buck_gpios[0],
					(s5m8767->buck_gpioindex >> 2) & 0x1);
			/* SET2 GPIO */
			gpio_direction_output(pdata->buck_gpios[1],
					(s5m8767->buck_gpioindex >> 1) & 0x1);
			/* SET3 GPIO */
			gpio_direction_output(pdata->buck_gpios[2],
					(s5m8767->buck_gpioindex >> 0) & 0x1);
			ret = 0;
		} else {
			dev_err(&pdev->dev, "GPIO NOT VALID\n");
			ret = -EINVAL;
			return ret;
		}
	}

	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK2CTRL,
			(pdata->buck2_gpiodvs) ? (1 << 1) : (0 << 1), 1 << 1);
	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK3CTRL,
			(pdata->buck3_gpiodvs) ? (1 << 1) : (0 << 1), 1 << 1);
	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK4CTRL,
			(pdata->buck4_gpiodvs) ? (1 << 1) : (0 << 1), 1 << 1);

	/* Initialize GPIO DVS registers */
	for (i = 0; i < 8; i++) {
		if (s5m8767->buck2_gpiodvs) {
			s5m_reg_write(s5m8767->iodev, S5M8767_REG_BUCK2DVS1 + i,
					   s5m8767->buck2_vol[i]);
		}

		if (s5m8767->buck3_gpiodvs) {
			s5m_reg_write(s5m8767->iodev, S5M8767_REG_BUCK3DVS1 + i,
					   s5m8767->buck3_vol[i]);
		}

		if (s5m8767->buck4_gpiodvs) {
			s5m_reg_write(s5m8767->iodev, S5M8767_REG_BUCK4DVS1 + i,
					   s5m8767->buck4_vol[i]);
		}
	}
	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK2CTRL, 0x78, 0xff);
	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK3CTRL, 0x58, 0xff);
	s5m_reg_update(s5m8767->iodev, S5M8767_REG_BUCK4CTRL, 0x78, 0xff);

	if (s5m8767->buck2_ramp)
		s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP, 0x08, 0x08);

	if (s5m8767->buck3_ramp)
		s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP, 0x04, 0x04);

	if (s5m8767->buck4_ramp)
		s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP, 0x02, 0x02);

	if (s5m8767->buck2_ramp || s5m8767->buck3_ramp
		|| s5m8767->buck4_ramp) {
		switch (s5m8767->ramp_delay) {
		case 15:
			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
					0xc0, 0xf0);
			break;
		case 25:
			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
					0xd0, 0xf0);
			break;
		case 50:
			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
					0xe0, 0xf0);
			break;
		case 100:
			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
					0xf0, 0xf0);
			break;
		default:
			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
					0x90, 0xf0);
		}
	}

	for (i = 0; i < pdata->num_regulators; i++) {
		const struct s5m_voltage_desc *desc;
		int id = pdata->regulators[i].id;

		desc = reg_voltage_map[id];
		if (desc)
			regulators[id].n_voltages =
				(desc->max - desc->min) / desc->step + 1;

		rdev[i] = regulator_register(&regulators[id], s5m8767->dev,
				pdata->regulators[i].initdata, s5m8767, NULL);
		if (IS_ERR(rdev[i])) {
			ret = PTR_ERR(rdev[i]);
			dev_err(s5m8767->dev, "regulator init failed for %d\n",
					id);
			rdev[i] = NULL;
			goto err;
		}
	}

	return 0;
err:
	for (i = 0; i < s5m8767->num_regulators; i++)
		if (rdev[i])
			regulator_unregister(rdev[i]);

	return ret;
}

static int __devexit s5m8767_pmic_remove(struct platform_device *pdev)
{
	struct s5m8767_info *s5m8767 = platform_get_drvdata(pdev);
	struct regulator_dev **rdev = s5m8767->rdev;
	int i;

	for (i = 0; i < s5m8767->num_regulators; i++)
		if (rdev[i])
			regulator_unregister(rdev[i]);

	return 0;
}

static const struct platform_device_id s5m8767_pmic_id[] = {
	{ "s5m8767-pmic", 0},
	{ },
};
MODULE_DEVICE_TABLE(platform, s5m8767_pmic_id);

static struct platform_driver s5m8767_pmic_driver = {
	.driver = {
		.name = "s5m8767-pmic",
		.owner = THIS_MODULE,
	},
	.probe = s5m8767_pmic_probe,
	.remove = __devexit_p(s5m8767_pmic_remove),
	.id_table = s5m8767_pmic_id,
};

static int __init s5m8767_pmic_init(void)
{
	return platform_driver_register(&s5m8767_pmic_driver);
}
subsys_initcall(s5m8767_pmic_init);

static void __exit s5m8767_pmic_exit(void)
{
	platform_driver_unregister(&s5m8767_pmic_driver);
}
module_exit(s5m8767_pmic_exit);

/* Module information */
MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
MODULE_DESCRIPTION("SAMSUNG S5M8767 Regulator Driver");
MODULE_LICENSE("GPL");