drivers/regulator/s5m8767.c - maze/linux - Git at Google

 /*
  * 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/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/samsung/core.h>
 #include <linux/mfd/samsung/s5m8767.h>

 struct s5m8767_info {
 	struct device *dev;
 	struct sec_pmic_dev *iodev;
 	int num_regulators;
 	struct regulator_dev **rdev;
 	struct sec_opmode_data *opmode;

 	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_ds[3];
 	int buck_gpioindex;
 };

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

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

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

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

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

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

 static const struct sec_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 unsigned int s5m8767_opmode_reg[][4] = {
 	/* {OFF, ON, LOWPOWER, SUSPEND} */
 	/* LDO1 ... LDO28 */
 	{0x0, 0x3, 0x2, 0x1}, /* LDO1 */
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x0, 0x0, 0x0},
 	{0x0, 0x3, 0x2, 0x1}, /* LDO5 */
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1}, /* LDO10 */
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1}, /* LDO15 */
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x0, 0x0, 0x0},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1}, /* LDO20 */
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x0, 0x0, 0x0},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1}, /* LDO25 */
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1},
 	{0x0, 0x3, 0x2, 0x1}, /* LDO28 */

 	/* BUCK1 ... BUCK9 */
 	{0x0, 0x3, 0x1, 0x1}, /* BUCK1 */
 	{0x0, 0x3, 0x1, 0x1},
 	{0x0, 0x3, 0x1, 0x1},
 	{0x0, 0x3, 0x1, 0x1},
 	{0x0, 0x3, 0x2, 0x1}, /* BUCK5 */
 	{0x0, 0x3, 0x1, 0x1},
 	{0x0, 0x3, 0x1, 0x1},
 	{0x0, 0x3, 0x1, 0x1},
 	{0x0, 0x3, 0x1, 0x1}, /* BUCK9 */
 };

 static int s5m8767_get_register(struct regulator_dev *rdev, int *reg,
 				int *enable_ctrl)
 {
 	int i, reg_id = rdev_get_id(rdev);
 	unsigned int mode;
 	struct s5m8767_info *s5m8767 = rdev_get_drvdata(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;
 	}

 	for (i = 0; i < s5m8767->num_regulators; i++) {
 		if (s5m8767->opmode[i].id == reg_id) {
 			mode = s5m8767->opmode[i].mode;
 			break;
 		}
 	}

 	if (i < s5m8767->num_regulators)
 		*enable_ctrl =
 		s5m8767_opmode_reg[reg_id][mode] << S5M8767_ENCTRL_SHIFT;

 	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, enable_ctrl;
 	unsigned int val;

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

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

 	return (val & mask) == enable_ctrl;
 }

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

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

 	return sec_reg_update(s5m8767->iodev, reg, enable_ctrl, mask);
 }

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

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

 	return sec_reg_update(s5m8767->iodev, reg, ~mask, 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);
 	unsigned int val;

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

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

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

 	val &= mask;

 	return val;
 }

 static int s5m8767_convert_voltage_to_sel(
 		const struct sec_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;

 	if (min_vol < desc->min)
 		min_vol = desc->min;

 	selector = DIV_ROUND_UP(min_vol - desc->min, desc->step);

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

 	return selector;
 }

 static inline int 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);

 	return 0;
 }

 static inline int 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);

 	return 0;
 }

 static int s5m8767_set_voltage_sel(struct regulator_dev *rdev,
 				   unsigned selector)
 {
 	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
 	int reg_id = rdev_get_id(rdev);
 	int reg, mask, ret = 0, old_index, index = 0;
 	u8 *buck234_vol = NULL;

 	switch (reg_id) {
 	case S5M8767_LDO1 ... S5M8767_LDO28:
 		mask = 0x3f;
 		break;
 	case S5M8767_BUCK1 ... S5M8767_BUCK6:
 		mask = 0xff;
 		if (reg_id == S5M8767_BUCK2 && s5m8767->buck2_gpiodvs)
 			buck234_vol = &s5m8767->buck2_vol[0];
 		else if (reg_id == S5M8767_BUCK3 && s5m8767->buck3_gpiodvs)
 			buck234_vol = &s5m8767->buck3_vol[0];
 		else if (reg_id == S5M8767_BUCK4 && s5m8767->buck4_gpiodvs)
 			buck234_vol = &s5m8767->buck4_vol[0];
 		break;
 	case S5M8767_BUCK7 ... S5M8767_BUCK8:
 		return -EINVAL;
 	case S5M8767_BUCK9:
 		mask = 0xff;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* buck234_vol != NULL means to control buck234 voltage via DVS GPIO */
 	if (buck234_vol) {
 		while (*buck234_vol != selector) {
 			buck234_vol++;
 			index++;
 		}
 		old_index = s5m8767->buck_gpioindex;
 		s5m8767->buck_gpioindex = index;

 		if (index > old_index)
 			return s5m8767_set_high(s5m8767);
 		else
 			return s5m8767_set_low(s5m8767);
 	} else {
 		ret = s5m8767_get_voltage_register(rdev, &reg);
 		if (ret)
 			return ret;

 		return sec_reg_update(s5m8767->iodev, reg, selector, mask);
 	}
 }

 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 sec_voltage_desc *desc;
 	int reg_id = rdev_get_id(rdev);

 	desc = reg_voltage_map[reg_id];

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

 static struct regulator_ops s5m8767_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.is_enabled		= s5m8767_reg_is_enabled,
 	.enable			= s5m8767_reg_enable,
 	.disable		= s5m8767_reg_disable,
 	.get_voltage_sel	= s5m8767_get_voltage_sel,
 	.set_voltage_sel	= s5m8767_set_voltage_sel,
 	.set_voltage_time_sel	= s5m8767_set_voltage_time_sel,
 };

 static struct regulator_ops s5m8767_buck78_ops = {
 	.is_enabled		= s5m8767_reg_is_enabled,
 	.enable			= s5m8767_reg_enable,
 	.disable		= s5m8767_reg_disable,
 };

 #define s5m8767_regulator_desc(_name) {		\
 	.name		= #_name,		\
 	.id		= S5M8767_##_name,	\
 	.ops		= &s5m8767_ops,		\
 	.type		= REGULATOR_VOLTAGE,	\
 	.owner		= THIS_MODULE,		\
 }

 #define s5m8767_regulator_buck78_desc(_name) {	\
 	.name		= #_name,		\
 	.id		= S5M8767_##_name,	\
 	.ops		= &s5m8767_buck78_ops,	\
 	.type		= REGULATOR_VOLTAGE,	\
 	.owner		= THIS_MODULE,		\
 }

 static struct regulator_desc regulators[] = {
 	s5m8767_regulator_desc(LDO1),
 	s5m8767_regulator_desc(LDO2),
 	s5m8767_regulator_desc(LDO3),
 	s5m8767_regulator_desc(LDO4),
 	s5m8767_regulator_desc(LDO5),
 	s5m8767_regulator_desc(LDO6),
 	s5m8767_regulator_desc(LDO7),
 	s5m8767_regulator_desc(LDO8),
 	s5m8767_regulator_desc(LDO9),
 	s5m8767_regulator_desc(LDO10),
 	s5m8767_regulator_desc(LDO11),
 	s5m8767_regulator_desc(LDO12),
 	s5m8767_regulator_desc(LDO13),
 	s5m8767_regulator_desc(LDO14),
 	s5m8767_regulator_desc(LDO15),
 	s5m8767_regulator_desc(LDO16),
 	s5m8767_regulator_desc(LDO17),
 	s5m8767_regulator_desc(LDO18),
 	s5m8767_regulator_desc(LDO19),
 	s5m8767_regulator_desc(LDO20),
 	s5m8767_regulator_desc(LDO21),
 	s5m8767_regulator_desc(LDO22),
 	s5m8767_regulator_desc(LDO23),
 	s5m8767_regulator_desc(LDO24),
 	s5m8767_regulator_desc(LDO25),
 	s5m8767_regulator_desc(LDO26),
 	s5m8767_regulator_desc(LDO27),
 	s5m8767_regulator_desc(LDO28),
 	s5m8767_regulator_desc(BUCK1),
 	s5m8767_regulator_desc(BUCK2),
 	s5m8767_regulator_desc(BUCK3),
 	s5m8767_regulator_desc(BUCK4),
 	s5m8767_regulator_desc(BUCK5),
 	s5m8767_regulator_desc(BUCK6),
 	s5m8767_regulator_buck78_desc(BUCK7),
 	s5m8767_regulator_buck78_desc(BUCK8),
 	s5m8767_regulator_desc(BUCK9),
 };

 static int s5m8767_pmic_probe(struct platform_device *pdev)
 {
 	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
 	struct regulator_config config = { };
 	struct regulator_dev **rdev;
 	struct s5m8767_info *s5m8767;
 	int i, ret, size, buck_init;

 	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 = pdata->num_regulators;
 	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->buck_ds[0] = pdata->buck_ds[0];
 	s5m8767->buck_ds[1] = pdata->buck_ds[1];
 	s5m8767->buck_ds[2] = pdata->buck_ds[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;
 	s5m8767->opmode = pdata->opmode;

 	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
 						pdata->buck2_init,
 						pdata->buck2_init +
 						buck_voltage_val2.step);

 	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK2DVS2, buck_init);

 	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
 						pdata->buck3_init,
 						pdata->buck3_init +
 						buck_voltage_val2.step);

 	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK3DVS2, buck_init);

 	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
 						pdata->buck4_init,
 						pdata->buck4_init +
 						buck_voltage_val2.step);

 	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK4DVS2, buck_init);

 	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])) {
 			dev_err(&pdev->dev, "GPIO NOT VALID\n");
 			return -EINVAL;
 		}

 		ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[0],
 					"S5M8767 SET1");
 		if (ret)
 			return ret;

 		ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[1],
 					"S5M8767 SET2");
 		if (ret)
 			return ret;

 		ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[2],
 					"S5M8767 SET3");
 		if (ret)
 			return ret;

 		/* 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 = devm_gpio_request(&pdev->dev, pdata->buck_ds[0], "S5M8767 DS2");
 	if (ret)
 		return ret;

 	ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[1], "S5M8767 DS3");
 	if (ret)
 		return ret;

 	ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[2], "S5M8767 DS4");
 	if (ret)
 		return ret;

 	/* DS2 GPIO */
 	gpio_direction_output(pdata->buck_ds[0], 0x0);
 	/* DS3 GPIO */
 	gpio_direction_output(pdata->buck_ds[1], 0x0);
 	/* DS4 GPIO */
 	gpio_direction_output(pdata->buck_ds[2], 0x0);

 	if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs ||
 	   pdata->buck4_gpiodvs) {
 		sec_reg_update(s5m8767->iodev, S5M8767_REG_BUCK2CTRL,
 				(pdata->buck2_gpiodvs) ? (1 << 1) : (0 << 1),
 				1 << 1);
 		sec_reg_update(s5m8767->iodev, S5M8767_REG_BUCK3CTRL,
 				(pdata->buck3_gpiodvs) ? (1 << 1) : (0 << 1),
 				1 << 1);
 		sec_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) {
 			sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK2DVS1 + i,
 					   s5m8767->buck2_vol[i]);
 		}

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

 		if (s5m8767->buck4_gpiodvs) {
 			sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK4DVS1 + i,
 					   s5m8767->buck4_vol[i]);
 		}
 	}

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

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

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

 	if (s5m8767->buck2_ramp || s5m8767->buck3_ramp
 		|| s5m8767->buck4_ramp) {
 		switch (s5m8767->ramp_delay) {
 		case 5:
 			sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
 					0x40, 0xf0);
 			break;
 		case 10:
 			sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
 					0x90, 0xf0);
 			break;
 		case 25:
 			sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
 					0xd0, 0xf0);
 			break;
 		case 50:
 			sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
 					0xe0, 0xf0);
 			break;
 		case 100:
 			sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
 					0xf0, 0xf0);
 			break;
 		default:
 			sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
 					0x90, 0xf0);
 		}
 	}

 	for (i = 0; i < pdata->num_regulators; i++) {
 		const struct sec_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;
 			regulators[id].min_uV = desc->min;
 			regulators[id].uV_step = desc->step;
 		}

 		config.dev = s5m8767->dev;
 		config.init_data = pdata->regulators[i].initdata;
 		config.driver_data = s5m8767;

 		rdev[i] = regulator_register(&regulators[id], &config);
 		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 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 = 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/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/samsung/core.h>
	#include <linux/mfd/samsung/s5m8767.h>

	struct s5m8767_info {
	struct device *dev;
	struct sec_pmic_dev *iodev;
	int num_regulators;
	struct regulator_dev **rdev;
	struct sec_opmode_data *opmode;

	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_ds[3];
	int buck_gpioindex;
	};

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

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

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

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

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

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

	static const struct sec_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 unsigned int s5m8767_opmode_reg[][4] = {
	/* {OFF, ON, LOWPOWER, SUSPEND} */
	/* LDO1 ... LDO28 */
	{0x0, 0x3, 0x2, 0x1}, /* LDO1 */
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x0, 0x0, 0x0},
	{0x0, 0x3, 0x2, 0x1}, /* LDO5 */
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1}, /* LDO10 */
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1}, /* LDO15 */
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x0, 0x0, 0x0},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1}, /* LDO20 */
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x0, 0x0, 0x0},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1}, /* LDO25 */
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1},
	{0x0, 0x3, 0x2, 0x1}, /* LDO28 */

	/* BUCK1 ... BUCK9 */
	{0x0, 0x3, 0x1, 0x1}, /* BUCK1 */
	{0x0, 0x3, 0x1, 0x1},
	{0x0, 0x3, 0x1, 0x1},
	{0x0, 0x3, 0x1, 0x1},
	{0x0, 0x3, 0x2, 0x1}, /* BUCK5 */
	{0x0, 0x3, 0x1, 0x1},
	{0x0, 0x3, 0x1, 0x1},
	{0x0, 0x3, 0x1, 0x1},
	{0x0, 0x3, 0x1, 0x1}, /* BUCK9 */
	};

	static int s5m8767_get_register(struct regulator_dev rdev, int reg,
	int *enable_ctrl)
	{
	int i, reg_id = rdev_get_id(rdev);
	unsigned int mode;
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(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;
	}

	for (i = 0; i < s5m8767->num_regulators; i++) {
	if (s5m8767->opmode[i].id == reg_id) {
	mode = s5m8767->opmode[i].mode;
	break;
	}
	}

	if (i < s5m8767->num_regulators)
	*enable_ctrl =
	s5m8767_opmode_reg[reg_id][mode] << S5M8767_ENCTRL_SHIFT;

	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, enable_ctrl;
	unsigned int val;

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

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

	return (val & mask) == enable_ctrl;
	}

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

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

	return sec_reg_update(s5m8767->iodev, reg, enable_ctrl, mask);
	}

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

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

	return sec_reg_update(s5m8767->iodev, reg, ~mask, 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);
	unsigned int val;

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

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

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

	val &= mask;

	return val;
	}

	static int s5m8767_convert_voltage_to_sel(
	const struct sec_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;

	if (min_vol < desc->min)
	min_vol = desc->min;

	selector = DIV_ROUND_UP(min_vol - desc->min, desc->step);

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

	return selector;
	}

	static inline int 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);

	return 0;
	}

	static inline int 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);

	return 0;
	}

	static int s5m8767_set_voltage_sel(struct regulator_dev *rdev,
	unsigned selector)
	{
	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
	int reg_id = rdev_get_id(rdev);
	int reg, mask, ret = 0, old_index, index = 0;
	u8 *buck234_vol = NULL;

	switch (reg_id) {
	case S5M8767_LDO1 ... S5M8767_LDO28:
	mask = 0x3f;
	break;
	case S5M8767_BUCK1 ... S5M8767_BUCK6:
	mask = 0xff;
	if (reg_id == S5M8767_BUCK2 && s5m8767->buck2_gpiodvs)
	buck234_vol = &s5m8767->buck2_vol[0];
	else if (reg_id == S5M8767_BUCK3 && s5m8767->buck3_gpiodvs)
	buck234_vol = &s5m8767->buck3_vol[0];
	else if (reg_id == S5M8767_BUCK4 && s5m8767->buck4_gpiodvs)
	buck234_vol = &s5m8767->buck4_vol[0];
	break;
	case S5M8767_BUCK7 ... S5M8767_BUCK8:
	return -EINVAL;
	case S5M8767_BUCK9:
	mask = 0xff;
	break;
	default:
	return -EINVAL;
	}

	/* buck234_vol != NULL means to control buck234 voltage via DVS GPIO */
	if (buck234_vol) {
	while (*buck234_vol != selector) {
	buck234_vol++;
	index++;
	}
	old_index = s5m8767->buck_gpioindex;
	s5m8767->buck_gpioindex = index;

	if (index > old_index)
	return s5m8767_set_high(s5m8767);
	else
	return s5m8767_set_low(s5m8767);
	} else {
	ret = s5m8767_get_voltage_register(rdev, &reg);
	if (ret)
	return ret;

	return sec_reg_update(s5m8767->iodev, reg, selector, mask);
	}
	}

	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 sec_voltage_desc *desc;
	int reg_id = rdev_get_id(rdev);

	desc = reg_voltage_map[reg_id];

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

	static struct regulator_ops s5m8767_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.is_enabled = s5m8767_reg_is_enabled,
	.enable = s5m8767_reg_enable,
	.disable = s5m8767_reg_disable,
	.get_voltage_sel = s5m8767_get_voltage_sel,
	.set_voltage_sel = s5m8767_set_voltage_sel,
	.set_voltage_time_sel = s5m8767_set_voltage_time_sel,
	};

	static struct regulator_ops s5m8767_buck78_ops = {
	.is_enabled = s5m8767_reg_is_enabled,
	.enable = s5m8767_reg_enable,
	.disable = s5m8767_reg_disable,
	};

	#define s5m8767_regulator_desc(_name) { \
	.name = #_name, \
	.id = S5M8767_##_name, \
	.ops = &s5m8767_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}

	#define s5m8767_regulator_buck78_desc(_name) { \
	.name = #_name, \
	.id = S5M8767_##_name, \
	.ops = &s5m8767_buck78_ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	}

	static struct regulator_desc regulators[] = {
	s5m8767_regulator_desc(LDO1),
	s5m8767_regulator_desc(LDO2),
	s5m8767_regulator_desc(LDO3),
	s5m8767_regulator_desc(LDO4),
	s5m8767_regulator_desc(LDO5),
	s5m8767_regulator_desc(LDO6),
	s5m8767_regulator_desc(LDO7),
	s5m8767_regulator_desc(LDO8),
	s5m8767_regulator_desc(LDO9),
	s5m8767_regulator_desc(LDO10),
	s5m8767_regulator_desc(LDO11),
	s5m8767_regulator_desc(LDO12),
	s5m8767_regulator_desc(LDO13),
	s5m8767_regulator_desc(LDO14),
	s5m8767_regulator_desc(LDO15),
	s5m8767_regulator_desc(LDO16),
	s5m8767_regulator_desc(LDO17),
	s5m8767_regulator_desc(LDO18),
	s5m8767_regulator_desc(LDO19),
	s5m8767_regulator_desc(LDO20),
	s5m8767_regulator_desc(LDO21),
	s5m8767_regulator_desc(LDO22),
	s5m8767_regulator_desc(LDO23),
	s5m8767_regulator_desc(LDO24),
	s5m8767_regulator_desc(LDO25),
	s5m8767_regulator_desc(LDO26),
	s5m8767_regulator_desc(LDO27),
	s5m8767_regulator_desc(LDO28),
	s5m8767_regulator_desc(BUCK1),
	s5m8767_regulator_desc(BUCK2),
	s5m8767_regulator_desc(BUCK3),
	s5m8767_regulator_desc(BUCK4),
	s5m8767_regulator_desc(BUCK5),
	s5m8767_regulator_desc(BUCK6),
	s5m8767_regulator_buck78_desc(BUCK7),
	s5m8767_regulator_buck78_desc(BUCK8),
	s5m8767_regulator_desc(BUCK9),
	};

	static int s5m8767_pmic_probe(struct platform_device *pdev)
	{
	struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
	struct regulator_config config = { };
	struct regulator_dev **rdev;
	struct s5m8767_info *s5m8767;
	int i, ret, size, buck_init;

	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 = pdata->num_regulators;
	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->buck_ds[0] = pdata->buck_ds[0];
	s5m8767->buck_ds[1] = pdata->buck_ds[1];
	s5m8767->buck_ds[2] = pdata->buck_ds[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;
	s5m8767->opmode = pdata->opmode;

	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
	pdata->buck2_init,
	pdata->buck2_init +
	buck_voltage_val2.step);

	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK2DVS2, buck_init);

	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
	pdata->buck3_init,
	pdata->buck3_init +
	buck_voltage_val2.step);

	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK3DVS2, buck_init);

	buck_init = s5m8767_convert_voltage_to_sel(&buck_voltage_val2,
	pdata->buck4_init,
	pdata->buck4_init +
	buck_voltage_val2.step);

	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK4DVS2, buck_init);

	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])) {
	dev_err(&pdev->dev, "GPIO NOT VALID\n");
	return -EINVAL;
	}

	ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[0],
	"S5M8767 SET1");
	if (ret)
	return ret;

	ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[1],
	"S5M8767 SET2");
	if (ret)
	return ret;

	ret = devm_gpio_request(&pdev->dev, pdata->buck_gpios[2],
	"S5M8767 SET3");
	if (ret)
	return ret;

	/* 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 = devm_gpio_request(&pdev->dev, pdata->buck_ds[0], "S5M8767 DS2");
	if (ret)
	return ret;

	ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[1], "S5M8767 DS3");
	if (ret)
	return ret;

	ret = devm_gpio_request(&pdev->dev, pdata->buck_ds[2], "S5M8767 DS4");
	if (ret)
	return ret;

	/* DS2 GPIO */
	gpio_direction_output(pdata->buck_ds[0], 0x0);
	/* DS3 GPIO */
	gpio_direction_output(pdata->buck_ds[1], 0x0);
	/* DS4 GPIO */
	gpio_direction_output(pdata->buck_ds[2], 0x0);

	if (pdata->buck2_gpiodvs \|\| pdata->buck3_gpiodvs \|\|
	pdata->buck4_gpiodvs) {
	sec_reg_update(s5m8767->iodev, S5M8767_REG_BUCK2CTRL,
	(pdata->buck2_gpiodvs) ? (1 << 1) : (0 << 1),
	1 << 1);
	sec_reg_update(s5m8767->iodev, S5M8767_REG_BUCK3CTRL,
	(pdata->buck3_gpiodvs) ? (1 << 1) : (0 << 1),
	1 << 1);
	sec_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) {
	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK2DVS1 + i,
	s5m8767->buck2_vol[i]);
	}

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

	if (s5m8767->buck4_gpiodvs) {
	sec_reg_write(s5m8767->iodev, S5M8767_REG_BUCK4DVS1 + i,
	s5m8767->buck4_vol[i]);
	}
	}

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

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

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

	if (s5m8767->buck2_ramp \|\| s5m8767->buck3_ramp
	\|\| s5m8767->buck4_ramp) {
	switch (s5m8767->ramp_delay) {
	case 5:
	sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
	0x40, 0xf0);
	break;
	case 10:
	sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
	0x90, 0xf0);
	break;
	case 25:
	sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
	0xd0, 0xf0);
	break;
	case 50:
	sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
	0xe0, 0xf0);
	break;
	case 100:
	sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
	0xf0, 0xf0);
	break;
	default:
	sec_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
	0x90, 0xf0);
	}
	}

	for (i = 0; i < pdata->num_regulators; i++) {
	const struct sec_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;
	regulators[id].min_uV = desc->min;
	regulators[id].uV_step = desc->step;
	}

	config.dev = s5m8767->dev;
	config.init_data = pdata->regulators[i].initdata;
	config.driver_data = s5m8767;

	rdev[i] = regulator_register(&regulators[id], &config);
	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 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 = 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");