drivers/regulator/s5m8767.c - kernel/msm-4.9 - Gitiles

 /*
  * 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 sel, reg, mask, ret;
 	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];

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

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

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

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

 	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");
	/*
	* 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 sel, reg, mask, ret;
	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];

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

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

	s5m_reg_read(s5m8767->iodev, reg, &val);
	val &= ~mask;
	val \|= sel;

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

	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");