[PATCH] regulator: Add S5M8767 regulator driver

[Sangbeom Kim <sbkim73@samsung.com>]

S5M8767 is a cost-effective PMIC which is designed for mobile applications.
It includes high efficient 8 Buck converters, 27 LDOs, and an RTC.
This patch implement regulator driver for S5M8767.

Signed-off-by: Sangbeom Kim <sbkim73@samsung.com>
---
 drivers/regulator/Kconfig   |    8 +
 drivers/regulator/Makefile  |    1 +
 drivers/regulator/s5m8767.c |  852
+++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 861 insertions(+), 0 deletions(-)
 create mode 100644 drivers/regulator/s5m8767.c

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index c7fd2c0..9d35b8e 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -125,6 +125,14 @@ config REGULATOR_MAX8998
 	  via I2C bus. The provided regulator is suitable for S3C6410
 	  and S5PC1XX chips to control VCC_CORE and VCC_USIM voltages.
 
+config REGULATOR_S5M8767
+	tristate "Samsung S5M8767 voltage regulator"
+	depends on MFD_S5M_CORE
+	help
+	  This driver controls a Samsung S5M8767 voltage output regulator
+	  via I2C bus. S5M8767 have 8 Bucks and 27 LDOs output and
+	  supports 8 DVS modes ranging from 0.65V to 2.225V by 6.25mV steps.
+
 config REGULATOR_TWL4030
 	bool "TI TWL4030/TWL5030/TWL6030/TPS659x0 PMIC"
 	depends on TWL4030_CORE
diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 040d5aa..478fc0f 100644
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -45,5 +45,6 @@ obj-$(CONFIG_REGULATOR_AB8500)	+= ab8500.o
 obj-$(CONFIG_REGULATOR_DB8500_PRCMU) += db8500-prcmu.o
 obj-$(CONFIG_REGULATOR_TPS65910) += tps65910-regulator.o
 obj-$(CONFIG_REGULATOR_AAT2870) += aat2870-regulator.o
+obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 
 ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c
new file mode 100644
index 0000000..2c4c10c
--- /dev/null
+++ b/drivers/regulator/s5m8767.c
@@ -0,0 +1,852 @@
+/*
+ * 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/platform_device.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/s5m87xx/s5m-pmic.h>
+#include <linux/mfd/s5m87xx/s5m-core.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_val = {
+	.max = 2225000,
+	.min = 650000,
+	.step = 6250,
+};
+
+static const struct s5m_voltage_desc ldo_voltage_val = {
+	.max = 3950000,
+	.min = 800000,
+	.step = 50000,
+};
+
+static const struct s5m_voltage_desc *reg_voltage_map[] = {
+	[S5M8767_LDO1] = &ldo_voltage_val,
+	[S5M8767_LDO2] = &ldo_voltage_val,
+	[S5M8767_LDO3] = &ldo_voltage_val,
+	[S5M8767_LDO4] = &ldo_voltage_val,
+	[S5M8767_LDO5] = &ldo_voltage_val,
+	[S5M8767_LDO6] = &ldo_voltage_val,
+	[S5M8767_LDO7] = &ldo_voltage_val,
+	[S5M8767_LDO8] = &ldo_voltage_val,
+	[S5M8767_LDO9] = &ldo_voltage_val,
+	[S5M8767_LDO10] = &ldo_voltage_val,
+	[S5M8767_LDO11] = &ldo_voltage_val,
+	[S5M8767_LDO12] = &ldo_voltage_val,
+	[S5M8767_LDO13] = &ldo_voltage_val,
+	[S5M8767_LDO14] = &ldo_voltage_val,
+	[S5M8767_LDO15] = &ldo_voltage_val,
+	[S5M8767_LDO16] = &ldo_voltage_val,
+	[S5M8767_LDO17] = &ldo_voltage_val,
+	[S5M8767_LDO18] = &ldo_voltage_val,
+	[S5M8767_LDO19] = &ldo_voltage_val,
+	[S5M8767_LDO20] = &ldo_voltage_val,
+	[S5M8767_LDO21] = &ldo_voltage_val,
+	[S5M8767_LDO22] = &ldo_voltage_val,
+	[S5M8767_LDO23] = &ldo_voltage_val,
+	[S5M8767_LDO24] = &ldo_voltage_val,
+	[S5M8767_LDO25] = &ldo_voltage_val,
+	[S5M8767_LDO26] = &ldo_voltage_val,
+	[S5M8767_LDO27] = &ldo_voltage_val,
+	[S5M8767_BUCK1] = &buck_voltage_val,
+	[S5M8767_BUCK2] = &buck_voltage_val,
+	[S5M8767_BUCK3] = &buck_voltage_val,
+	[S5M8767_BUCK4] = &buck_voltage_val,
+	[S5M8767_BUCK5] = &buck_voltage_val,
+	[S5M8767_BUCK6] = &buck_voltage_val,
+	[S5M8767_BUCK7] = NULL,
+	[S5M8767_BUCK8] = NULL,
+};
+
+static inline int s5m8767_get_regid(struct regulator_dev *rdev)
+{
+	return rdev_get_id(rdev);
+}
+
+static inline int s5m8767_is_buck(struct regulator_dev *rdev)
+{
+	int reg_id = s5m8767_get_regid(rdev);
+
+	return reg_id < S5M8767_LDO27;
+}
+
+static int s5m8767_list_voltage(struct regulator_dev *rdev,
+				unsigned int selector)
+{
+	const struct s5m_voltage_desc *desc;
+	int reg_id = s5m8767_get_regid(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 = s5m8767_get_regid(rdev);
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		*reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);
+		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 ... S5M8767_BUCK8:
+		*reg = S5M8767_REG_BUCK5CTRL1 + (reg_id - S5M8767_BUCK5) *
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=0x01, pattern=0x01;
+	u8 val;
+	int reg_id = s5m8767_get_regid(rdev);
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		mask = 0xc0;
+		pattern = 0xc0;
+		break;
+	case S5M8767_BUCK1 ... S5M8767_BUCK8:
+		break;
+	}
+
+	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=0, pattern=0;
+	int reg_id = s5m8767_get_regid(rdev);
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		mask = 0xc0;
+		pattern = 0xc0;
+		break;
+	case S5M8767_BUCK1 ... S5M8767_BUCK8:
+		mask = 0x01;
+		pattern = 0x01;
+		break;
+	}
+
+	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=0, pattern=0;
+	int reg_id = s5m8767_get_regid(rdev);
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		mask = 0xc0;
+		pattern = 0xc0;
+		break;
+	case S5M8767_BUCK1 ... S5M8767_BUCK8:
+		mask = 0x01;
+		pattern = 0x01;
+		break;
+	}
+
+	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)
+{
+	int reg_id = s5m8767_get_regid(rdev);
+	int reg;
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		reg = S5M8767_REG_LDO1CTRL + (reg_id - S5M8767_LDO1);
+		break;
+	case S5M8767_BUCK1:
+		reg = S5M8767_REG_BUCK1CTRL2;
+		break;
+	case S5M8767_BUCK2:
+		reg = S5M8767_REG_BUCK2DVS1;
+		break;
+	case S5M8767_BUCK3:
+		reg = S5M8767_REG_BUCK3DVS1;
+		break;
+	case S5M8767_BUCK4:
+		reg = S5M8767_REG_BUCK4DVS1;
+		break;
+	case S5M8767_BUCK5 ... S5M8767_BUCK8:
+		reg = S5M8767_REG_BUCK5CTRL2 + (reg_id - S5M8767_BUCK5) * 2;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	*_reg = reg;
+
+	return 0;
+}
+
+static int s5m8767_get_voltage(struct regulator_dev *rdev)
+{
+	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
+	int reg, mask=0xff, ret;
+	int reg_id = s5m8767_get_regid(rdev);
+	u8 val;
+
+	ret = s5m8767_get_voltage_register(rdev, &reg);
+	if (ret)
+		return ret;
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		mask = 0x3f;
+		break;
+	case S5M8767_BUCK2:
+		if(s5m8767->buck2_gpiodvs)
+			reg += s5m8767->buck_gpioindex;
+		break;
+	case S5M8767_BUCK3:
+		if(s5m8767->buck3_gpiodvs)
+			reg += s5m8767->buck_gpioindex;
+		break;
+	case S5M8767_BUCK4:
+		if(s5m8767->buck4_gpiodvs)
+			reg += s5m8767->buck_gpioindex;
+		break;
+	}
+
+	ret = s5m_reg_read(s5m8767->iodev, reg, &val);
+	if (ret)
+		return ret;
+
+	val &= mask;
+
+	if (rdev->desc && rdev->desc->ops && rdev->desc->ops->list_voltage)
+		return rdev->desc->ops->list_voltage(rdev, val);
+
+	return s5m8767_list_voltage(rdev, val);
+}
+
+static inline int s5m8767_convert_voltage(
+		const struct s5m_voltage_desc *desc,
+		int min_vol, int max_vol)
+{
+	int i = 0;
+
+	if (desc == NULL)
+		return -EINVAL;
+
+	if (max_vol < desc->min || min_vol > desc->max)
+		return -EINVAL;
+
+	i = (min_vol - desc->min) / desc->step;
+
+	if (desc->min + desc->step * i > max_vol)
+		return -EINVAL;
+
+	return i;
+}
+
+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);
+	int min_vol = min_uV, max_vol = max_uV;
+	const struct s5m_voltage_desc *desc;
+	int reg_id = s5m8767_get_regid(rdev);
+	int reg, mask, ret;
+	int i;
+	u8 val;
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		mask = 0x3f;
+		break;
+	case S5M8767_BUCK1 ... S5M8767_BUCK6:
+		mask = 0xff;
+		break;
+	case S5M8767_BUCK7 ... S5M8767_BUCK8:
+		return -EINVAL;
+	default:
+		return -EINVAL;
+	}
+
+	desc = reg_voltage_map[reg_id];
+
+	i = s5m8767_convert_voltage(desc, min_vol, max_vol);
+	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_update(s5m8767->iodev, reg, i, mask);
+	*selector = i;
+
+	if (val < i)
+		udelay(DIV_ROUND_UP(desc->step * (i - val),
+			s5m8767->ramp_delay));
+
+	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 = s5m8767_get_regid(rdev);
+	const struct s5m_voltage_desc *desc;
+	int new_val, old_val, i = 0;
+	int min_vol = min_uV, max_vol = max_uV;
+
+	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);
+	}
+
+	desc = reg_voltage_map[reg_id];
+	new_val = s5m8767_convert_voltage(desc, min_vol, max_vol);
+	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_reg_enable_suspend(struct regulator_dev *rdev)
+{
+	return 0;
+}
+
+static int s5m8767_reg_disable_suspend(struct regulator_dev *rdev)
+{
+	struct s5m8767_info *s5m8767 = rdev_get_drvdata(rdev);
+	int ret, reg;
+	int  mask=0, pattern=0;
+	int reg_id = s5m8767_get_regid(rdev);
+
+	switch (reg_id) {
+	case S5M8767_LDO1 ... S5M8767_LDO27:
+		mask = 0xc0;
+		pattern = 0xc0;
+		break;
+	case S5M8767_BUCK1 ... S5M8767_BUCK8:
+		mask = 0x01;
+		pattern = 0x01;
+		break;
+	}
+
+	ret = s5m8767_get_register(rdev, &reg);
+	if (ret)
+		return ret;
+
+	return s5m_reg_update(s5m8767->iodev, reg, ~pattern, mask);
+}
+
+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		= s5m8767_get_voltage,
+	.set_voltage		= s5m8767_set_voltage,
+	.set_suspend_enable	= s5m8767_reg_enable_suspend,
+	.set_suspend_disable	= s5m8767_reg_disable_suspend,
+};
+
+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		= s5m8767_get_voltage,
+	.set_voltage		= s5m8767_set_voltage_buck,
+	.set_suspend_enable	= s5m8767_reg_enable_suspend,
+	.set_suspend_disable	= s5m8767_reg_disable_suspend,
+};
+
+static struct regulator_ops s5m8767_others_ops = {
+	.is_enabled		= s5m8767_reg_is_enabled,
+	.enable			= s5m8767_reg_enable,
+	.disable		= s5m8767_reg_disable,
+	.set_suspend_enable	= s5m8767_reg_enable_suspend,
+	.set_suspend_disable	= s5m8767_reg_disable_suspend,
+};
+
+#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_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),
+	{
+		.name	= "AP 32KHz",
+		.id	= S5M8767_32KHZAP_EN,
+		.ops	= &s5m8767_others_ops,
+		.type	= REGULATOR_VOLTAGE,
+		.owner	= THIS_MODULE,
+	}, {
+		.name	= "CP 32KHz",
+		.id	= S5M8767_32KHZAP_EN,
+		.ops	= &s5m8767_others_ops,
+		.type	= REGULATOR_VOLTAGE,
+		.owner	= THIS_MODULE,
+	},
+};
+
+static __devinit int s5m8767_pmic_probe(struct platform_device *pdev)
+{
+	struct s5m87xx_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct s5m87xx_platform_data *pdata = dev_get_platdata(iodev->dev);
+	struct regulator_dev **rdev;
+	struct s5m8767_info *s5m8767;
+	struct i2c_client *i2c;
+	int i, ret, size, reg;
+	u8 val;
+
+	if (!pdata) {
+		dev_err(pdev->dev.parent, "Platform data not supplied\n");
+		return -ENODEV;
+	}
+
+	s5m8767 = kzalloc(sizeof(struct s5m8767_info), GFP_KERNEL);
+	if (!s5m8767)
+		return -ENOMEM;
+
+	size = sizeof(struct regulator_dev *) * pdata->num_regulators;
+	s5m8767->rdev = kzalloc(size, GFP_KERNEL);
+	if (!s5m8767->rdev) {
+		kfree(s5m8767);
+		return -ENOMEM;
+	}
+
+	rdev = s5m8767->rdev;
+	s5m8767->dev = &pdev->dev;
+	s5m8767->iodev = iodev;
+	s5m8767->num_regulators = pdata->num_regulators;
+	platform_set_drvdata(pdev, s5m8767);
+	i2c = s5m8767->iodev->i2c;
+
+	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(
+						&buck_voltage_val,
+						pdata->buck2_voltage[i],
+						pdata->buck2_voltage[i] +
+						buck_voltage_val.step);
+		}
+
+		if (s5m8767->buck3_gpiodvs) {
+			s5m8767->buck3_vol[i] =
+				s5m8767_convert_voltage(
+						&buck_voltage_val,
+						pdata->buck3_voltage[i],
+						pdata->buck3_voltage[i] +
+						buck_voltage_val.step);
+		}
+
+		if (s5m8767->buck4_gpiodvs) {
+			s5m8767->buck4_vol[i] =
+				s5m8767_convert_voltage(
+						&buck_voltage_val,
+						pdata->buck4_voltage[i],
+						pdata->buck4_voltage[i] +
+						buck_voltage_val.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 ISN'T VALID\n");
+			ret = -EINVAL;
+			goto err_alloc;
+		}
+	}
+
+	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]);
+		}
+	}
+
+	reg = S5M8767_REG_LDO7CTRL;
+
+	do{
+		ret = s5m_reg_read(s5m8767->iodev, reg, &val);
+		if (ret)
+			return ret;
+
+		s5m_reg_update(s5m8767->iodev, reg, ((val & 0x3f) | 0x80),
0xff);
+		reg++;
+		if ((reg == S5M8767_REG_LDO9CTRL)
+		    || (reg == S5M8767_REG_LDO11CTRL)
+		    || (reg == S5M8767_REG_LDO13CTRL)
+		    || (reg == S5M8767_REG_LDO17CTRL))
+			reg++;
+	} while (reg <= S5M8767_REG_LDO27CTRL);
+
+	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) {
+		if (s5m8767->ramp_delay < 15)
+			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
+				       s5m8767->ramp_delay - 1, 0xf0);
+		else if (s5m8767->ramp_delay == 15)
+			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
+				       0xc0, 0xf0);
+		else if (s5m8767->ramp_delay == 25)
+			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
+				       0xd0, 0xf0);
+		else if (s5m8767->ramp_delay == 50)
+			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
+				       0xe0, 0xf0);
+		else if (s5m8767->ramp_delay == 100)
+			s5m_reg_update(s5m8767->iodev, S5M8767_REG_DVSRAMP,
+				       0xf0, 0xf0);
+		else
+			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);
+		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]);
+err_alloc:
+	kfree(s5m8767->rdev);
+	kfree(s5m8767);
+
+	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]);
+
+	kfree(s5m8767->rdev);
+	kfree(s5m8767);
+
+	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");
+MODULE_ALIAS("platform:s5m8767-pmic");
-- 
1.7.1