regulator: max77693: Add regulator driver for max77693

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>

1 files changed, 792 insertions, 0 deletions

diff --git a/drivers/regulator/max77693.c b/drivers/regulator/max77693.c
new file mode 100644
index 00000000000..85776b27764
--- /dev/null
+++ b/drivers/regulator/max77693.c
@@ -0,0 +1,792 @@
+/*
+ * max77693.c - Regulator driver for the Maxim 77693
+ *
+ * Copyright (C) 2011 Samsung Electronics
+ * Sukdong Kim <sukdong.kim@smasung.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This driver is based on max8997.c
+ */
+
+#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/module.h>
+#include <linux/export.h>
+#include <linux/regulator/driver.h>
+#include <linux/regulator/machine.h>
+#include <linux/mfd/max77693.h>
+#include <linux/mfd/max77693-private.h>
+
+struct max77693_data {
+	struct device *dev;
+	struct max77693_dev *iodev;
+	int num_regulators;
+	struct regulator_dev **rdev;
+
+	u8 saved_states[MAX77693_REG_MAX];
+};
+
+struct voltage_map_desc {
+	int min;
+	int max;
+	int step;
+	unsigned int n_bits;
+};
+
+/* current map in mA */
+static const struct voltage_map_desc charger_current_map_desc = {
+	.min = 60, .max = 2580, .step = 20, .n_bits = 7,
+};
+
+static const struct voltage_map_desc topoff_current_map_desc = {
+	.min = 50, .max = 200, .step = 10, .n_bits = 4,
+};
+
+static const struct voltage_map_desc *reg_voltage_map[] = {
+	[MAX77693_ESAFEOUT1] = NULL,
+	[MAX77693_ESAFEOUT2] = NULL,
+	[MAX77693_CHARGER] = &charger_current_map_desc,
+};
+
+static inline int max77693_get_rid(struct regulator_dev *rdev)
+{
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	return rdev_get_id(rdev);
+}
+
+static int max77693_list_voltage_safeout(struct regulator_dev *rdev,
+					 unsigned int selector)
+{
+	int rid = max77693_get_rid(rdev);
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	if (rid == MAX77693_ESAFEOUT1 || rid == MAX77693_ESAFEOUT2) {
+		switch (selector) {
+		case 0:
+			return 4850000;
+		case 1:
+			return 4900000;
+		case 2:
+			return 4950000;
+		case 3:
+			return 3300000;
+		default:
+			return -EINVAL;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int max77693_get_enable_register(struct regulator_dev *rdev,
+					int *reg, int *mask, int *pattern)
+{
+	int rid = max77693_get_rid(rdev);
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	switch (rid) {
+	case MAX77693_ESAFEOUT1...MAX77693_ESAFEOUT2:
+		*reg = MAX77693_CHG_REG_SAFEOUT_CTRL;
+		*mask = 0x40 << (rid - MAX77693_ESAFEOUT1);
+		*pattern = 0x40 << (rid - MAX77693_ESAFEOUT1);
+		break;
+	case MAX77693_CHARGER:
+		*reg = MAX77693_CHG_REG_CHG_CNFG_00;
+		*mask = 0xf;
+		*pattern = 0x5;
+		break;
+	default:
+		/* Not controllable or not exists */
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77693_get_disable_register(struct regulator_dev *rdev,
+					int *reg, int *mask, int *pattern)
+{
+	int rid = max77693_get_rid(rdev);
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	switch (rid) {
+	case MAX77693_ESAFEOUT1...MAX77693_ESAFEOUT2:
+		*reg = MAX77693_CHG_REG_SAFEOUT_CTRL;
+		*mask = 0x40 << (rid - MAX77693_ESAFEOUT1);
+		*pattern = 0x00;
+		break;
+	case MAX77693_CHARGER:
+		*reg = MAX77693_CHG_REG_CHG_CNFG_00;
+		*mask = 0xf;
+		*pattern = 0x00;
+		break;
+	default:
+		/* Not controllable or not exists */
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77693_reg_is_enabled(struct regulator_dev *rdev)
+{
+	int ret, reg, mask, pattern;
+	u8 val;
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	ret = max77693_get_enable_register(rdev, &reg, &mask, &pattern);
+	if (ret == -EINVAL)
+		return 1;	/* "not controllable" */
+	else if (ret)
+		return ret;
+
+	ret = max77693_read_reg(rdev->regmap, reg, &val);
+	if (ret)
+		return ret;
+
+	return (val & mask) == pattern;
+}
+
+static int max77693_reg_enable(struct regulator_dev *rdev)
+{
+	int ret, reg, mask, pattern;
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	ret = max77693_get_enable_register(rdev, &reg, &mask, &pattern);
+	if (ret)
+		return ret;
+
+	return max77693_update_reg(rdev->regmap, reg, pattern, mask);
+}
+
+static int max77693_reg_disable(struct regulator_dev *rdev)
+{
+	int ret, reg, mask, pattern;
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	ret = max77693_get_disable_register(rdev, &reg, &mask, &pattern);
+	if (ret)
+		return ret;
+
+	return max77693_update_reg(rdev->regmap, reg, pattern, mask);
+}
+
+static int max77693_get_voltage_register(struct regulator_dev *rdev,
+					 int *_reg, int *_shift, int *_mask)
+{
+	int rid = max77693_get_rid(rdev);
+	int reg, shift = 0, mask = 0x3f;
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	switch (rid) {
+	case MAX77693_ESAFEOUT1...MAX77693_ESAFEOUT2:
+		reg = MAX77693_CHG_REG_SAFEOUT_CTRL;
+		shift = (rid == MAX77693_ESAFEOUT2) ? 2 : 0;
+		mask = 0x3;
+		break;
+	case MAX77693_CHARGER:
+		reg = MAX77693_CHG_REG_CHG_CNFG_09;
+		shift = 0;
+		mask = 0x7f;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	*_reg = reg;
+	*_shift = shift;
+	*_mask = mask;
+
+	return 0;
+}
+
+static int max77693_list_voltage(struct regulator_dev *rdev,
+				 unsigned int selector)
+{
+	const struct voltage_map_desc *desc;
+	int rid = max77693_get_rid(rdev);
+	int val;
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	if (rid >= ARRAY_SIZE(reg_voltage_map) || rid < 0)
+		return -EINVAL;
+
+	desc = reg_voltage_map[rid];
+	if (desc == NULL)
+		return -EINVAL;
+
+	/* the first four codes for charger current are all 60mA */
+	if (rid == MAX77693_CHARGER) {
+		if (selector <= 3)
+			selector = 0;
+		else
+			selector -= 3;
+	}
+
+	val = desc->min + desc->step * selector;
+	if (val > desc->max)
+		return -EINVAL;
+
+	return val * 1000;
+}
+
+static int max77693_get_voltage(struct regulator_dev *rdev)
+{
+	int reg, shift, mask, ret;
+
+	u8 val;
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	ret = max77693_get_voltage_register(rdev, &reg, &shift, &mask);
+	if (ret)
+		return ret;
+
+	ret = max77693_read_reg(rdev->regmap, reg, &val);
+	if (ret)
+		return ret;
+
+	val >>= shift;
+	val &= mask;
+
+	if (rdev->desc && rdev->desc->ops && rdev->desc->ops->list_voltage)
+		return rdev->desc->ops->list_voltage(rdev, val);
+
+	/*
+	 * max77693_list_voltage returns value for any rdev with voltage_map,
+	 * which works for "CHARGER" and "CHARGER TOPOFF" that do not have
+	 * list_voltage ops (they are current regulators).
+	 */
+	return max77693_list_voltage(rdev, val);
+}
+
+static inline int max77693_get_voltage_proper_val(
+		const struct voltage_map_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;
+
+	while (desc->min + desc->step * i < min_vol &&
+			desc->min + desc->step * i < desc->max)
+		i++;
+
+	if (desc->min + desc->step * i > max_vol)
+		return -EINVAL;
+
+	if (i >= (1 << desc->n_bits))
+		return -EINVAL;
+
+	return i;
+}
+
+static int max77693_set_voltage(struct regulator_dev *rdev,
+				int min_uV, int max_uV)
+{
+	int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
+	const struct voltage_map_desc *desc;
+	int rid = max77693_get_rid(rdev);
+	int reg, shift = 0, mask, ret;
+	int i;
+	u8 org;
+
+	switch (rid) {
+	case MAX77693_CHARGER:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	desc = reg_voltage_map[rid];
+
+	i = max77693_get_voltage_proper_val(desc, min_vol, max_vol);
+	if (i < 0)
+		return i;
+
+	ret = max77693_get_voltage_register(rdev, &reg, &shift, &mask);
+	if (ret)
+		return ret;
+
+	max77693_read_reg(rdev->regmap, reg, &org);
+	org = (org & mask) >> shift;
+
+	/* the first four codes for charger current are all 60mA */
+	if (rid == MAX77693_CHARGER)
+		i += 3;
+
+	ret = max77693_update_reg(rdev->regmap, reg, i << shift, mask << shift);
+
+	return ret;
+}
+
+static const int safeoutvolt[] = {
+	3300000,
+	4850000,
+	4900000,
+	4950000,
+};
+
+/* For SAFEOUT1 and SAFEOUT2 */
+static int max77693_set_voltage_safeout(struct regulator_dev *rdev,
+					int min_uV, int max_uV,
+					unsigned *selector)
+{
+	int rid = max77693_get_rid(rdev);
+	int reg, shift = 0, mask, ret;
+	int i = 0;
+	u8 val;
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	if (rid != MAX77693_ESAFEOUT1 && rid != MAX77693_ESAFEOUT2)
+		return -EINVAL;
+
+	for (i = 0; i < ARRAY_SIZE(safeoutvolt); i++) {
+		if (min_uV <= safeoutvolt[i] && max_uV >= safeoutvolt[i])
+			break;
+	}
+
+	if (i >= ARRAY_SIZE(safeoutvolt))
+		return -EINVAL;
+
+	if (i == 0)
+		val = 0x3;
+	else
+		val = i - 1;
+
+	ret = max77693_get_voltage_register(rdev, &reg, &shift, &mask);
+	if (ret)
+		return ret;
+
+	ret = max77693_update_reg(rdev->regmap, reg, val << shift, mask << shift);
+	*selector = val;
+
+	return ret;
+}
+
+static int max77693_reg_enable_suspend(struct regulator_dev *rdev)
+{
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	return 0;
+}
+
+static int max77693_reg_disable_suspend(struct regulator_dev *rdev)
+{
+	struct max77693_data *max77693 = rdev_get_drvdata(rdev);
+	int ret, reg, mask, pattern;
+	int rid = max77693_get_rid(rdev);
+	dev_info(&rdev->dev, "func:%s\n", __func__);
+	ret = max77693_get_disable_register(rdev, &reg, &mask, &pattern);
+	if (ret)
+		return ret;
+
+	max77693_read_reg(rdev->regmap, reg, &max77693->saved_states[rid]);
+
+	dev_dbg(&rdev->dev, "Full Power-Off for %s (%xh -> %xh)\n",
+		rdev->desc->name, max77693->saved_states[rid] & mask,
+		(~pattern) & mask);
+	return max77693_update_reg(rdev->regmap, reg, pattern, mask);
+}
+
+/*
+ * max77693_muic_is_enable_otg - Check the power state of otg
+ * @rdev: the instance for voltage/current regulator class device
+ */
+static bool max77693_muic_is_enable_otg(struct regulator_dev *rdev)
+{
+	u8 chg_cnfg_00;
+	u8 mask;
+	u8 state;
+
+	/* OTG on, boost on, DIS_MUIC_CTRL=1 */
+	max77693_read_reg(rdev->regmap,
+		MAX77693_CHG_REG_CHG_CNFG_00, &chg_cnfg_00);
+
+	mask = (CHG_CNFG_00_OTG_MASK
+			| CHG_CNFG_00_BOOST_MASK
+			| CHG_CNFG_00_DIS_MUIC_CTRL_MASK);
+
+	state = chg_cnfg_00 & mask;
+
+	if (state == mask)
+		return true;
+	else
+		return false;
+}
+
+/*
+ * max77693_muic_is_enable_usb - Check the power state of usb
+ * @rdev: the instance for voltage/current regulator class device
+ */
+static bool max77693_muic_is_enable_usb(struct regulator_dev *rdev)
+{
+	u8 chg_cnfg_00;
+	bool state = false;
+
+	max77693_read_reg(rdev->regmap,
+		MAX77693_CHG_REG_CHG_CNFG_00, &chg_cnfg_00);
+
+	if (chg_cnfg_00 == 0x05)
+		state = true;
+	else if (chg_cnfg_00 == 0x04)
+		state = false;
+
+	return state;
+}
+
+/*
+ * max77693_muic_enable_otg - Enable/disable otg feature on max77693
+ * @rdev: the instance for voltage/current regulator class device
+ * @enable: the state of otg feature (true: ON, false: OFF)
+ */
+static void max77693_muic_enable_otg(struct regulator_dev *rdev, int enable)
+{
+	struct max77693_data *max77693 = rdev_get_drvdata(rdev);
+	struct regmap *regmap_muic = max77693->iodev->regmap_muic;
+	static u8 chg_int_state; /* Restore charger interrupt states */
+	u8 int_mask;
+	u8 cdetctrl1;
+	u8 chg_cnfg_00;
+
+	dev_info(&rdev->dev, "enable(%d)\n", enable);
+
+	/*
+	 * FIXME: This function write/read directly the register of max77693
+	 *	charger device. It has dependency between muic and charger
+	 *	device. The dependency between two device have to be removed.
+	 *	- MAX77693_CHG_REG_CHG_CNFG_00 : control charger/OTG/buck/boost
+	 *	- MAX77693_CHG_REG_CHG_INT_MASK
+	 */
+	if (enable) {
+		/* disable charger interrupt */
+		max77693_read_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_INT_MASK, &int_mask);
+		chg_int_state = int_mask;
+		int_mask |= (1 << 4);	/* disable chgin intr */
+		int_mask |= (1 << 6);	/* disable chg */
+		int_mask &= ~(1 << 0);	/* enable byp intr */
+		max77693_write_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_INT_MASK, int_mask);
+
+		/* disable charger detection */
+		max77693_read_reg(regmap_muic,
+			MAX77693_MUIC_REG_CDETCTRL1, &cdetctrl1);
+		cdetctrl1 &= ~(1 << 0);
+		max77693_write_reg(regmap_muic,
+			MAX77693_MUIC_REG_CDETCTRL1, cdetctrl1);
+
+		/* OTG on, boost on, DIS_MUIC_CTRL=1 */
+		max77693_read_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_CNFG_00, &chg_cnfg_00);
+		chg_cnfg_00 &= ~(CHG_CNFG_00_CHG_MASK
+				| CHG_CNFG_00_OTG_MASK
+				| CHG_CNFG_00_BUCK_MASK
+				| CHG_CNFG_00_BOOST_MASK
+				| CHG_CNFG_00_DIS_MUIC_CTRL_MASK);
+		chg_cnfg_00 |= (CHG_CNFG_00_OTG_MASK
+				| CHG_CNFG_00_BOOST_MASK
+				| CHG_CNFG_00_DIS_MUIC_CTRL_MASK);
+		max77693_write_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_CNFG_00, chg_cnfg_00);
+	} else {
+		/* OTG off, boost off, (buck on),
+		   DIS_MUIC_CTRL = 0 unless CHG_ENA = 1 */
+		max77693_read_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_CNFG_00, &chg_cnfg_00);
+		chg_cnfg_00 &= ~(CHG_CNFG_00_OTG_MASK
+				| CHG_CNFG_00_BOOST_MASK
+				| CHG_CNFG_00_DIS_MUIC_CTRL_MASK);
+		chg_cnfg_00 |= CHG_CNFG_00_BUCK_MASK;
+		max77693_write_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_CNFG_00, chg_cnfg_00);
+
+		mdelay(50);
+
+		/* enable charger detection */
+		max77693_read_reg(regmap_muic,
+			MAX77693_MUIC_REG_CDETCTRL1, &cdetctrl1);
+		cdetctrl1 |= (1 << 0);
+		max77693_write_reg(regmap_muic,
+			MAX77693_MUIC_REG_CDETCTRL1, cdetctrl1);
+
+		/* enable charger interrupt */
+		max77693_write_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_INT_MASK, chg_int_state);
+		max77693_read_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_INT_MASK, &int_mask);
+	}
+
+	dev_info(&rdev->dev,
+		"INT_MASK(0x%x), CDETCTRL1(0x%x), CHG_CNFG_00(0x%x)\n",
+		int_mask, cdetctrl1, chg_cnfg_00);
+}
+
+/*
+ * max77693_muic_enable_powered_usb - Enable/disable usb feature on max77693
+ * @rdev: the instance for voltage/current regulator class device
+ * @enable: the state of USB feature (true: ON, false: OFF)
+ */
+static void max77693_muic_enable_usb(struct regulator_dev *rdev, int enable)
+{
+	dev_info(&rdev->dev, "enable(%d)\n", enable);
+
+	if (enable) {
+		/* OTG on, boost on */
+		max77693_write_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_CNFG_00, 0x05);
+
+		max77693_write_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_CNFG_02, 0x0E);
+	} else {
+		/* OTG off, boost off, (buck on) */
+		max77693_write_reg(rdev->regmap,
+			MAX77693_CHG_REG_CHG_CNFG_00, 0x04);
+	}
+}
+
+static int max77693_usb_is_enabled(struct regulator_dev *rdev)
+{
+	struct regulator_desc *desc = rdev->desc;
+	int ret;
+
+	switch (desc->id) {
+	case MAX77693_USBHOST:
+		ret = max77693_muic_is_enable_otg(rdev);
+		break;
+	case MAX77693_USB:
+		ret = max77693_muic_is_enable_usb(rdev);
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int max77693_usb_enable(struct regulator_dev *rdev)
+{
+	struct regulator_desc *desc = rdev->desc;
+
+	switch (desc->id) {
+	case MAX77693_USBHOST:
+		max77693_muic_enable_otg(rdev, true);
+		break;
+	case MAX77693_USB:
+		max77693_muic_enable_usb(rdev, true);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int max77693_usb_disable(struct regulator_dev *rdev)
+{
+	struct regulator_desc *desc = rdev->desc;
+
+	switch (desc->id) {
+	case MAX77693_USBHOST:
+		max77693_muic_enable_otg(rdev, false);
+		break;
+	case MAX77693_USB:
+		max77693_muic_enable_usb(rdev, false);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static struct regulator_ops max77693_safeout_ops = {
+	.list_voltage = max77693_list_voltage_safeout,
+	.is_enabled = max77693_reg_is_enabled,
+	.enable = max77693_reg_enable,
+	.disable = max77693_reg_disable,
+	.get_voltage = max77693_get_voltage,
+	.set_voltage = max77693_set_voltage_safeout,
+	.set_suspend_enable = max77693_reg_enable_suspend,
+	.set_suspend_disable = max77693_reg_disable_suspend,
+};
+
+static struct regulator_ops max77693_charger_ops = {
+	.is_enabled		= max77693_reg_is_enabled,
+	.enable			= max77693_reg_enable,
+	.disable		= max77693_reg_disable,
+	.get_current_limit	= max77693_get_voltage,
+	.set_current_limit	= max77693_set_voltage,
+};
+
+static struct regulator_ops max77693_usb_ops = {
+	.is_enabled		= max77693_usb_is_enabled,
+	.enable			= max77693_usb_enable,
+	.disable		= max77693_usb_disable,
+};
+
+static struct regulator_desc regulators[] = {
+	{
+		.name = "ESAFEOUT1",
+		.id = MAX77693_ESAFEOUT1,
+		.ops = &max77693_safeout_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.n_voltages = 4,
+	}, {
+		.name = "ESAFEOUT2",
+		.id = MAX77693_ESAFEOUT2,
+		.ops = &max77693_safeout_ops,
+		.type = REGULATOR_VOLTAGE,
+		.owner = THIS_MODULE,
+		.n_voltages = 4,
+	}, {
+		.name = "CHARGER",
+		.id = MAX77693_CHARGER,
+		.ops = &max77693_charger_ops,
+		.type = REGULATOR_CURRENT,
+		.owner = THIS_MODULE,
+	}, {
+		.name = "USBHOST",
+		.id = MAX77693_USBHOST,
+		.ops = &max77693_usb_ops,
+		.type = REGULATOR_CURRENT,
+		.owner = THIS_MODULE,
+	}, {
+		.name = "USB",
+		.id = MAX77693_USB,
+		.ops = &max77693_usb_ops,
+		.type = REGULATOR_CURRENT,
+		.owner = THIS_MODULE,
+	},
+};
+
+static __devinit int max77693_pmic_probe(struct platform_device *pdev)
+{
+	struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct max77693_platform_data *pdata = dev_get_platdata(iodev->dev);
+	struct max77693_data *max77693;
+	int i, ret, size;
+	struct regulator_config config = {};
+
+	dev_info(&pdev->dev, "%s\n", __func__);
+	if (!pdata) {
+		pr_info("[%s:%d] !pdata\n", __FILE__, __LINE__);
+		dev_err(pdev->dev.parent, "No platform init data supplied.\n");
+		return -ENODEV;
+	}
+
+	max77693 = devm_kzalloc(&pdev->dev, sizeof(struct max77693_data),
+				GFP_KERNEL);
+	if (!max77693) {
+		pr_info("[%s:%d] if (!max77693)\n", __FILE__, __LINE__);
+		return -ENOMEM;
+	}
+	size = sizeof(struct regulator_dev *) * pdata->num_regulators;
+	max77693->rdev =devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+	if (!max77693->rdev) {
+		pr_info("[%s:%d] if (!max77693->rdev)\n", __FILE__, __LINE__);
+		return -ENOMEM;
+	}
+
+	max77693->dev = &pdev->dev;
+	max77693->iodev = iodev;
+	max77693->num_regulators = pdata->num_regulators;
+
+	config.dev = &pdev->dev;
+	config.regmap = iodev->regmap;
+	config.driver_data = max77693;
+	platform_set_drvdata(pdev, max77693);
+
+	pr_info("[%s:%d] pdata->num_regulators:%d\n", __FILE__, __LINE__,
+		pdata->num_regulators);
+	for (i = 0; i < pdata->num_regulators; i++) {
+		const struct voltage_map_desc *desc;
+		int id = pdata->regulators[i].id;
+
+		config.init_data = pdata->regulators[i].initdata;
+
+		pr_info("[%s:%d] for in pdata->num_regulators:%d\n", __FILE__,
+			__LINE__, pdata->num_regulators);
+		desc = reg_voltage_map[id];
+		if (id == MAX77693_ESAFEOUT1 || id == MAX77693_ESAFEOUT2)
+			regulators[id].n_voltages = 4;
+
+		max77693->rdev[i] = regulator_register(&regulators[id], &config);
+		if (IS_ERR(max77693->rdev[i])) {
+			ret = PTR_ERR(max77693->rdev[i]);
+			dev_err(max77693->dev, "regulator init failed for %d\n",
+				id);
+			max77693->rdev[i] = NULL;
+			goto err;
+		}
+	}
+
+	return 0;
+ err:
+	pr_info("[%s:%d] err:\n", __FILE__, __LINE__);
+	while (--i >= 0)
+		regulator_unregister(max77693->rdev[i]);
+
+	return ret;
+}
+
+static int __devexit max77693_pmic_remove(struct platform_device *pdev)
+{
+	struct max77693_data *max77693 = platform_get_drvdata(pdev);
+	struct regulator_dev **rdev = max77693->rdev;
+	int i;
+	dev_info(&pdev->dev, "%s\n", __func__);
+	for (i = 0; i < max77693->num_regulators; i++)
+		if (rdev[i])
+			regulator_unregister(rdev[i]);
+
+	return 0;
+}
+
+static const struct platform_device_id max77693_pmic_id[] = {
+	{"max77693-safeout", 0},
+	{},
+};
+
+MODULE_DEVICE_TABLE(platform, max77693_pmic_id);
+
+static struct platform_driver max77693_pmic_driver = {
+	.driver = {
+		   .name = "max77693-safeout",
+		   .owner = THIS_MODULE,
+		   },
+	.probe = max77693_pmic_probe,
+	.remove = __devexit_p(max77693_pmic_remove),
+	.id_table = max77693_pmic_id,
+};
+
+static int __init max77693_pmic_init(void)
+{
+	return platform_driver_register(&max77693_pmic_driver);
+}
+#ifdef CONFIG_FAST_RESUME
+beforeresume_initcall(max77693_pmic_init);
+#else
+subsys_initcall(max77693_pmic_init);
+#endif
+
+static void __exit max77693_pmic_cleanup(void)
+{
+	platform_driver_unregister(&max77693_pmic_driver);
+}
+
+module_exit(max77693_pmic_cleanup);
+
+MODULE_DESCRIPTION("MAXIM 77693 Regulator Driver");
+MODULE_AUTHOR("Sukdong Kim <Sukdong.Kim@samsung.com>");
+MODULE_LICENSE("GPL");