drivers/regulator/s2mpb02-regulator.c - LeafOS-Devices/android_kernel_samsung_exynos9820 - Gitiles

 /*
  * s2mpb02_regulator.c - Regulator driver for the Samsung s2mpb02
  *
  * Copyright (C) 2014 Samsung Electronics
  *
  * 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
  *
  */

 #include <linux/module.h>
 #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/samsung/s2mpb02.h>
 #include <linux/mfd/samsung/s2mpb02-regulator.h>
 #include <linux/regulator/of_regulator.h>

 struct s2mpb02_data {
 	struct s2mpb02_dev *iodev;
 	int num_regulators;
 	struct regulator_dev *rdev[S2MPB02_REGULATOR_MAX];
 	int opmode[S2MPB02_REGULATOR_MAX];
 };

 static int s2m_enable(struct regulator_dev *rdev)
 {
 	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = info->iodev->i2c;

 	return s2mpb02_update_reg(i2c, rdev->desc->enable_reg,
 				  info->opmode[rdev_get_id(rdev)],
 					rdev->desc->enable_mask);
 }

 static int s2m_disable_regmap(struct regulator_dev *rdev)
 {
 	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = info->iodev->i2c;
 	u8 val;

 	if (rdev->desc->enable_is_inverted)
 		val = rdev->desc->enable_mask;
 	else
 		val = 0;

 	return s2mpb02_update_reg(i2c, rdev->desc->enable_reg,
 				   val, rdev->desc->enable_mask);
 }

 static int s2m_is_enabled_regmap(struct regulator_dev *rdev)
 {
 	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = info->iodev->i2c;
 	int ret;
 	u8 val;

 	ret = s2mpb02_read_reg(i2c, rdev->desc->enable_reg, &val);
 	if (ret < 0)
 		return ret;

 	if (rdev->desc->enable_is_inverted)
 		return (val & rdev->desc->enable_mask) == 0;
 	else
 		return (val & rdev->desc->enable_mask) != 0;
 }

 static int s2m_get_voltage_sel_regmap(struct regulator_dev *rdev)
 {
 	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = info->iodev->i2c;
 	int ret;
 	u8 val;

 	ret = s2mpb02_read_reg(i2c, rdev->desc->vsel_reg, &val);
 	if (ret < 0)
 		return ret;

 	val &= rdev->desc->vsel_mask;

 	return val;
 }

 static int s2m_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
 {
 	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = info->iodev->i2c;
 	int ret;

 	ret = s2mpb02_update_reg(i2c, rdev->desc->vsel_reg,
 				sel, rdev->desc->vsel_mask);
 	if (ret < 0)
 		goto out;

 	if (rdev->desc->apply_bit)
 		ret = s2mpb02_update_reg(i2c, rdev->desc->apply_reg,
 					 rdev->desc->apply_bit,
 					 rdev->desc->apply_bit);
 	return ret;
 out:
 	pr_warn("%s: failed to set voltage_sel_regmap\n", rdev->desc->name);
 	return ret;
 }

 static int s2m_set_voltage_sel_regmap_buck(struct regulator_dev *rdev,
 					unsigned sel)
 {
 	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
 	struct i2c_client *i2c = info->iodev->i2c;
 	int ret;

 	ret = s2mpb02_write_reg(i2c, rdev->desc->vsel_reg, sel);
 	if (ret < 0)
 		goto out;

 	if (rdev->desc->apply_bit)
 		ret = s2mpb02_update_reg(i2c, rdev->desc->apply_reg,
 					 rdev->desc->apply_bit,
 					 rdev->desc->apply_bit);
 	return ret;
 out:
 	pr_warn("%s: failed to set voltage_sel_regmap\n", rdev->desc->name);
 	return ret;
 }

 static int s2m_set_voltage_time_sel(struct regulator_dev *rdev,
 				   unsigned int old_selector,
 				   unsigned int new_selector)
 {
 	int old_volt, new_volt;

 	/* sanity check */
 	if (!rdev->desc->ops->list_voltage)
 		return -EINVAL;

 	old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
 	new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);

 	if (old_selector < new_selector)
 		return DIV_ROUND_UP(new_volt - old_volt, S2MPB02_RAMP_DELAY);

 	return 0;
 }

 static struct regulator_ops s2mpb02_ldo_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.map_voltage		= regulator_map_voltage_linear,
 	.is_enabled		= s2m_is_enabled_regmap,
 	.enable			= s2m_enable,
 	.disable		= s2m_disable_regmap,
 	.get_voltage_sel	= s2m_get_voltage_sel_regmap,
 	.set_voltage_sel	= s2m_set_voltage_sel_regmap,
 	.set_voltage_time_sel	= s2m_set_voltage_time_sel,
 };

 static struct regulator_ops s2mpb02_buck_ops = {
 	.list_voltage		= regulator_list_voltage_linear,
 	.map_voltage		= regulator_map_voltage_linear,
 	.is_enabled		= s2m_is_enabled_regmap,
 	.enable			= s2m_enable,
 	.disable		= s2m_disable_regmap,
 	.get_voltage_sel	= s2m_get_voltage_sel_regmap,
 	.set_voltage_sel	= s2m_set_voltage_sel_regmap_buck,
 	.set_voltage_time_sel	= s2m_set_voltage_time_sel,
 };

 #define _BUCK(macro)	S2MPB02_BUCK##macro
 #define _buck_ops(num)	s2mpb02_buck_ops##num

 #define _LDO(macro)	S2MPB02_LDO##macro
 #define _REG(ctrl)	S2MPB02_REG##ctrl
 #define _ldo_ops(num)	s2mpb02_ldo_ops##num
 #define _TIME(macro)	S2MPB02_ENABLE_TIME##macro

 #define BUCK_DESC(_name, _id, _ops, m, s, v, e, t)	{	\
 	.name		= _name,				\
 	.id		= _id,					\
 	.ops		= _ops,					\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= m,					\
 	.uV_step	= s,					\
 	.n_voltages	= S2MPB02_BUCK_N_VOLTAGES,		\
 	.vsel_reg	= v,					\
 	.vsel_mask	= S2MPB02_BUCK_VSEL_MASK,		\
 	.enable_reg	= e,					\
 	.enable_mask	= S2MPB02_BUCK_ENABLE_MASK,		\
 	.enable_time	= t					\
 }

 #define LDO_DESC(_name, _id, _ops, m, s, v, e, t)	{	\
 	.name		= _name,				\
 	.id		= _id,					\
 	.ops		= _ops,					\
 	.type		= REGULATOR_VOLTAGE,			\
 	.owner		= THIS_MODULE,				\
 	.min_uV		= m,					\
 	.uV_step	= s,					\
 	.n_voltages	= S2MPB02_LDO_N_VOLTAGES,		\
 	.vsel_reg	= v,					\
 	.vsel_mask	= S2MPB02_LDO_VSEL_MASK,		\
 	.enable_reg	= e,					\
 	.enable_mask	= S2MPB02_LDO_ENABLE_MASK,		\
 	.enable_time	= t					\
 }

 static struct regulator_desc regulators[S2MPB02_REGULATOR_MAX] = {
 		/* name, id, ops, min_uv, uV_step, vsel_reg, enable_reg */
 		LDO_DESC("s2mpb02-ldo1", _LDO(1), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP1), _REG(_L1CTRL),
 			_REG(_L1CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo2", _LDO(2), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP1), _REG(_L2CTRL),
 			_REG(_L2CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo3", _LDO(3), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP1), _REG(_L3CTRL),
 			_REG(_L3CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo4", _LDO(4), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP1), _REG(_L4CTRL),
 			_REG(_L4CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo5", _LDO(5), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP1), _REG(_L5CTRL),
 			_REG(_L5CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo6", _LDO(6), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L6CTRL),
 			_REG(_L6CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo7", _LDO(7), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L7CTRL),
 			_REG(_L7CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo8", _LDO(8), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L8CTRL),
 			_REG(_L8CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo9", _LDO(9), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L9CTRL),
 			_REG(_L9CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo10", _LDO(10), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L10CTRL),
 			_REG(_L10CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo11", _LDO(11), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L11CTRL),
 			_REG(_L11CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo12", _LDO(12), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L12CTRL),
 			_REG(_L12CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo13", _LDO(13), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L13CTRL),
 			_REG(_L13CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo14", _LDO(14), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L14CTRL),
 			_REG(_L14CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo15", _LDO(15), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L15CTRL),
 			_REG(_L15CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo16", _LDO(16), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L16CTRL),
 			_REG(_L16CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo17", _LDO(17), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L17CTRL),
 			_REG(_L17CTRL), _TIME(_LDO)),
 		LDO_DESC("s2mpb02-ldo18", _LDO(18), &_ldo_ops(), _LDO(_MIN1),
 			_LDO(_STEP2), _REG(_L18CTRL),
 			_REG(_L18CTRL), _TIME(_LDO)),
 		BUCK_DESC("s2mpb02-buck1", _BUCK(1), &_buck_ops(), _BUCK(_MIN1),
 			_BUCK(_STEP1), _REG(_B1CTRL2),
 			_REG(_B1CTRL1), _TIME(_BUCK)),
 		BUCK_DESC("s2mpb02-buck2", _BUCK(2), &_buck_ops(), _BUCK(_MIN1),
 			_BUCK(_STEP1), _REG(_B2CTRL2),
 			_REG(_B2CTRL1), _TIME(_BUCK)),
 		BUCK_DESC("s2mpb02-bb", S2MPB02_BB1, &_buck_ops(), _BUCK(_MIN2),
 			_BUCK(_STEP2), _REG(_BB1CTRL2),
 			_REG(_BB1CTRL1), _TIME(_BB)),
 };

 #ifdef CONFIG_OF
 static int s2mpb02_pmic_dt_parse_pdata(struct s2mpb02_dev *iodev,
 					struct s2mpb02_platform_data *pdata)
 {
 	struct device_node *pmic_np, *regulators_np, *reg_np;
 	struct s2mpb02_regulator_data *rdata;
 	unsigned long i;

 	pmic_np = iodev->dev->of_node;
 	if (!pmic_np) {
 		dev_err(iodev->dev, "could not find pmic sub-node\n");
 		return -ENODEV;
 	}

 	regulators_np = of_find_node_by_name(pmic_np, "regulators");
 	if (!regulators_np) {
 		dev_err(iodev->dev, "could not find regulators sub-node\n");
 		return -EINVAL;
 	}

 	/* count the number of regulators to be supported in pmic */
 	pdata->num_regulators = 0;
 	for_each_child_of_node(regulators_np, reg_np) {
 		pdata->num_regulators++;
 	}

 	rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) *
 				pdata->num_regulators, GFP_KERNEL);
 	if (!rdata) {
 		dev_err(iodev->dev,
 			"could not allocate memory for regulator data\n");
 		return -ENOMEM;
 	}

 	pdata->regulators = rdata;
 	for_each_child_of_node(regulators_np, reg_np) {
 		for (i = 0; i < ARRAY_SIZE(regulators); i++)
 			if (!of_node_cmp(reg_np->name,
 					regulators[i].name))
 				break;

 		if (i == ARRAY_SIZE(regulators)) {
 			dev_warn(iodev->dev,
 			"don't know how to configure regulator %s\n",
 			reg_np->name);
 			continue;
 		}

 		rdata->id = i;
 		rdata->initdata = of_get_regulator_init_data(
 						iodev->dev, reg_np,
 						&regulators[i]);
 		rdata->reg_node = reg_np;
 		rdata++;
 	}
 	of_node_put(regulators_np);

 	return 0;
 }
 #else
 static int s2mpb02_pmic_dt_parse_pdata(struct s2mpb02_dev *iodev,
 					struct s2mpb02_platform_data *pdata)
 {
 	return 0;
 }
 #endif /* CONFIG_OF */

 static int s2mpb02_pmic_probe(struct platform_device *pdev)
 {
 	struct s2mpb02_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 	struct s2mpb02_platform_data *pdata = iodev->pdata;
 	struct regulator_config config = { };
 	struct s2mpb02_data *s2mpb02;
 	struct i2c_client *i2c;
 	int i, ret;

 	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;
 	}

 	if (iodev->dev->of_node) {
 		ret = s2mpb02_pmic_dt_parse_pdata(iodev, pdata);
 		if (ret)
 			return ret;
 	}

 	s2mpb02 = devm_kzalloc(&pdev->dev, sizeof(struct s2mpb02_data),
 				GFP_KERNEL);
 	if (!s2mpb02) {
 		pr_info("[%s:%d] if (!s2mpb02)\n", __FILE__, __LINE__);
 		return -ENOMEM;
 	}

 	s2mpb02->iodev = iodev;
 	s2mpb02->num_regulators = pdata->num_regulators;
 	platform_set_drvdata(pdev, s2mpb02);
 	i2c = s2mpb02->iodev->i2c;

 	for (i = 0; i < pdata->num_regulators; i++) {
 		int id = pdata->regulators[i].id;
 		config.dev = &pdev->dev;
 		config.init_data = pdata->regulators[i].initdata;
 		config.driver_data = s2mpb02;
 		config.of_node = pdata->regulators[i].reg_node;
 		s2mpb02->opmode[id] = regulators[id].enable_mask;
 		s2mpb02->rdev[i] = regulator_register(&regulators[id], &config);
 		if (IS_ERR(s2mpb02->rdev[i])) {
 			ret = PTR_ERR(s2mpb02->rdev[i]);
 			dev_err(&pdev->dev, "regulator init failed for %d\n",
 				id);
 			s2mpb02->rdev[i] = NULL;
 			goto err;
 		}
 	}

 	pr_info("%s : s2mpb02 probe ended!\n", __func__);

 	return 0;
  err:
 	pr_info("[%s:%d] err:\n", __FILE__, __LINE__);
 	for (i = 0; i < s2mpb02->num_regulators; i++)
 		if (s2mpb02->rdev[i])
 			regulator_unregister(s2mpb02->rdev[i]);

 	devm_kfree(&pdev->dev, (void*)s2mpb02);

 	return ret;
 }

 static int s2mpb02_pmic_remove(struct platform_device *pdev)
 {
 	struct s2mpb02_data *s2mpb02 = platform_get_drvdata(pdev);
 	int i;
 	dev_info(&pdev->dev, "%s\n", __func__);
 	for (i = 0; i < s2mpb02->num_regulators; i++)
 		if (s2mpb02->rdev[i])
 			regulator_unregister(s2mpb02->rdev[i]);

 	return 0;
 }

 static const struct platform_device_id s2mpb02_pmic_id[] = {
 	{"s2mpb02-regulator", 0},
 	{},
 };
 MODULE_DEVICE_TABLE(platform, s2mpb02_pmic_id);

 static struct platform_driver s2mpb02_pmic_driver = {
 	.driver = {
 		   .name = "s2mpb02-regulator",
 		   .owner = THIS_MODULE,
 		   .suppress_bind_attrs = true,
 		   },
 	.probe = s2mpb02_pmic_probe,
 	.remove = s2mpb02_pmic_remove,
 	.id_table = s2mpb02_pmic_id,
 };

 static int __init s2mpb02_pmic_init(void)
 {
 	return platform_driver_register(&s2mpb02_pmic_driver);
 }
 subsys_initcall(s2mpb02_pmic_init);

 static void __exit s2mpb02_pmic_cleanup(void)
 {
 	platform_driver_unregister(&s2mpb02_pmic_driver);
 }

 module_exit(s2mpb02_pmic_cleanup);

 MODULE_DESCRIPTION("SAMSUNG s2mpb02 Regulator Driver");
 MODULE_LICENSE("GPL");
	/*
	* s2mpb02_regulator.c - Regulator driver for the Samsung s2mpb02
	*
	* Copyright (C) 2014 Samsung Electronics
	*
	* 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
	*
	*/

	#include <linux/module.h>
	#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/samsung/s2mpb02.h>
	#include <linux/mfd/samsung/s2mpb02-regulator.h>
	#include <linux/regulator/of_regulator.h>

	struct s2mpb02_data {
	struct s2mpb02_dev *iodev;
	int num_regulators;
	struct regulator_dev *rdev[S2MPB02_REGULATOR_MAX];
	int opmode[S2MPB02_REGULATOR_MAX];
	};

	static int s2m_enable(struct regulator_dev *rdev)
	{
	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = info->iodev->i2c;

	return s2mpb02_update_reg(i2c, rdev->desc->enable_reg,
	info->opmode[rdev_get_id(rdev)],
	rdev->desc->enable_mask);
	}

	static int s2m_disable_regmap(struct regulator_dev *rdev)
	{
	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = info->iodev->i2c;
	u8 val;

	if (rdev->desc->enable_is_inverted)
	val = rdev->desc->enable_mask;
	else
	val = 0;

	return s2mpb02_update_reg(i2c, rdev->desc->enable_reg,
	val, rdev->desc->enable_mask);
	}

	static int s2m_is_enabled_regmap(struct regulator_dev *rdev)
	{
	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = info->iodev->i2c;
	int ret;
	u8 val;

	ret = s2mpb02_read_reg(i2c, rdev->desc->enable_reg, &val);
	if (ret < 0)
	return ret;

	if (rdev->desc->enable_is_inverted)
	return (val & rdev->desc->enable_mask) == 0;
	else
	return (val & rdev->desc->enable_mask) != 0;
	}

	static int s2m_get_voltage_sel_regmap(struct regulator_dev *rdev)
	{
	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = info->iodev->i2c;
	int ret;
	u8 val;

	ret = s2mpb02_read_reg(i2c, rdev->desc->vsel_reg, &val);
	if (ret < 0)
	return ret;

	val &= rdev->desc->vsel_mask;

	return val;
	}

	static int s2m_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel)
	{
	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = info->iodev->i2c;
	int ret;

	ret = s2mpb02_update_reg(i2c, rdev->desc->vsel_reg,
	sel, rdev->desc->vsel_mask);
	if (ret < 0)
	goto out;

	if (rdev->desc->apply_bit)
	ret = s2mpb02_update_reg(i2c, rdev->desc->apply_reg,
	rdev->desc->apply_bit,
	rdev->desc->apply_bit);
	return ret;
	out:
	pr_warn("%s: failed to set voltage_sel_regmap\n", rdev->desc->name);
	return ret;
	}

	static int s2m_set_voltage_sel_regmap_buck(struct regulator_dev *rdev,
	unsigned sel)
	{
	struct s2mpb02_data *info = rdev_get_drvdata(rdev);
	struct i2c_client *i2c = info->iodev->i2c;
	int ret;

	ret = s2mpb02_write_reg(i2c, rdev->desc->vsel_reg, sel);
	if (ret < 0)
	goto out;

	if (rdev->desc->apply_bit)
	ret = s2mpb02_update_reg(i2c, rdev->desc->apply_reg,
	rdev->desc->apply_bit,
	rdev->desc->apply_bit);
	return ret;
	out:
	pr_warn("%s: failed to set voltage_sel_regmap\n", rdev->desc->name);
	return ret;
	}

	static int s2m_set_voltage_time_sel(struct regulator_dev *rdev,
	unsigned int old_selector,
	unsigned int new_selector)
	{
	int old_volt, new_volt;

	/* sanity check */
	if (!rdev->desc->ops->list_voltage)
	return -EINVAL;

	old_volt = rdev->desc->ops->list_voltage(rdev, old_selector);
	new_volt = rdev->desc->ops->list_voltage(rdev, new_selector);

	if (old_selector < new_selector)
	return DIV_ROUND_UP(new_volt - old_volt, S2MPB02_RAMP_DELAY);

	return 0;
	}

	static struct regulator_ops s2mpb02_ldo_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = s2m_is_enabled_regmap,
	.enable = s2m_enable,
	.disable = s2m_disable_regmap,
	.get_voltage_sel = s2m_get_voltage_sel_regmap,
	.set_voltage_sel = s2m_set_voltage_sel_regmap,
	.set_voltage_time_sel = s2m_set_voltage_time_sel,
	};

	static struct regulator_ops s2mpb02_buck_ops = {
	.list_voltage = regulator_list_voltage_linear,
	.map_voltage = regulator_map_voltage_linear,
	.is_enabled = s2m_is_enabled_regmap,
	.enable = s2m_enable,
	.disable = s2m_disable_regmap,
	.get_voltage_sel = s2m_get_voltage_sel_regmap,
	.set_voltage_sel = s2m_set_voltage_sel_regmap_buck,
	.set_voltage_time_sel = s2m_set_voltage_time_sel,
	};

	#define _BUCK(macro) S2MPB02_BUCK##macro
	#define _buck_ops(num) s2mpb02_buck_ops##num

	#define _LDO(macro) S2MPB02_LDO##macro
	#define _REG(ctrl) S2MPB02_REG##ctrl
	#define _ldo_ops(num) s2mpb02_ldo_ops##num
	#define _TIME(macro) S2MPB02_ENABLE_TIME##macro

	#define BUCK_DESC(_name, _id, _ops, m, s, v, e, t) { \
	.name = _name, \
	.id = _id, \
	.ops = _ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = m, \
	.uV_step = s, \
	.n_voltages = S2MPB02_BUCK_N_VOLTAGES, \
	.vsel_reg = v, \
	.vsel_mask = S2MPB02_BUCK_VSEL_MASK, \
	.enable_reg = e, \
	.enable_mask = S2MPB02_BUCK_ENABLE_MASK, \
	.enable_time = t \
	}

	#define LDO_DESC(_name, _id, _ops, m, s, v, e, t) { \
	.name = _name, \
	.id = _id, \
	.ops = _ops, \
	.type = REGULATOR_VOLTAGE, \
	.owner = THIS_MODULE, \
	.min_uV = m, \
	.uV_step = s, \
	.n_voltages = S2MPB02_LDO_N_VOLTAGES, \
	.vsel_reg = v, \
	.vsel_mask = S2MPB02_LDO_VSEL_MASK, \
	.enable_reg = e, \
	.enable_mask = S2MPB02_LDO_ENABLE_MASK, \
	.enable_time = t \
	}

	static struct regulator_desc regulators[S2MPB02_REGULATOR_MAX] = {
	/* name, id, ops, min_uv, uV_step, vsel_reg, enable_reg */
	LDO_DESC("s2mpb02-ldo1", _LDO(1), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP1), _REG(_L1CTRL),
	_REG(_L1CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo2", _LDO(2), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP1), _REG(_L2CTRL),
	_REG(_L2CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo3", _LDO(3), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP1), _REG(_L3CTRL),
	_REG(_L3CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo4", _LDO(4), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP1), _REG(_L4CTRL),
	_REG(_L4CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo5", _LDO(5), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP1), _REG(_L5CTRL),
	_REG(_L5CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo6", _LDO(6), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L6CTRL),
	_REG(_L6CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo7", _LDO(7), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L7CTRL),
	_REG(_L7CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo8", _LDO(8), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L8CTRL),
	_REG(_L8CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo9", _LDO(9), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L9CTRL),
	_REG(_L9CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo10", _LDO(10), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L10CTRL),
	_REG(_L10CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo11", _LDO(11), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L11CTRL),
	_REG(_L11CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo12", _LDO(12), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L12CTRL),
	_REG(_L12CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo13", _LDO(13), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L13CTRL),
	_REG(_L13CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo14", _LDO(14), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L14CTRL),
	_REG(_L14CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo15", _LDO(15), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L15CTRL),
	_REG(_L15CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo16", _LDO(16), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L16CTRL),
	_REG(_L16CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo17", _LDO(17), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L17CTRL),
	_REG(_L17CTRL), _TIME(_LDO)),
	LDO_DESC("s2mpb02-ldo18", _LDO(18), &_ldo_ops(), _LDO(_MIN1),
	_LDO(_STEP2), _REG(_L18CTRL),
	_REG(_L18CTRL), _TIME(_LDO)),
	BUCK_DESC("s2mpb02-buck1", _BUCK(1), &_buck_ops(), _BUCK(_MIN1),
	_BUCK(_STEP1), _REG(_B1CTRL2),
	_REG(_B1CTRL1), _TIME(_BUCK)),
	BUCK_DESC("s2mpb02-buck2", _BUCK(2), &_buck_ops(), _BUCK(_MIN1),
	_BUCK(_STEP1), _REG(_B2CTRL2),
	_REG(_B2CTRL1), _TIME(_BUCK)),
	BUCK_DESC("s2mpb02-bb", S2MPB02_BB1, &_buck_ops(), _BUCK(_MIN2),
	_BUCK(_STEP2), _REG(_BB1CTRL2),
	_REG(_BB1CTRL1), _TIME(_BB)),
	};

	#ifdef CONFIG_OF
	static int s2mpb02_pmic_dt_parse_pdata(struct s2mpb02_dev *iodev,
	struct s2mpb02_platform_data *pdata)
	{
	struct device_node pmic_np, regulators_np, *reg_np;
	struct s2mpb02_regulator_data *rdata;
	unsigned long i;

	pmic_np = iodev->dev->of_node;
	if (!pmic_np) {
	dev_err(iodev->dev, "could not find pmic sub-node\n");
	return -ENODEV;
	}

	regulators_np = of_find_node_by_name(pmic_np, "regulators");
	if (!regulators_np) {
	dev_err(iodev->dev, "could not find regulators sub-node\n");
	return -EINVAL;
	}

	/* count the number of regulators to be supported in pmic */
	pdata->num_regulators = 0;
	for_each_child_of_node(regulators_np, reg_np) {
	pdata->num_regulators++;
	}

	rdata = devm_kzalloc(iodev->dev, sizeof(rdata)
	pdata->num_regulators, GFP_KERNEL);
	if (!rdata) {
	dev_err(iodev->dev,
	"could not allocate memory for regulator data\n");
	return -ENOMEM;
	}

	pdata->regulators = rdata;
	for_each_child_of_node(regulators_np, reg_np) {
	for (i = 0; i < ARRAY_SIZE(regulators); i++)
	if (!of_node_cmp(reg_np->name,
	regulators[i].name))
	break;

	if (i == ARRAY_SIZE(regulators)) {
	dev_warn(iodev->dev,
	"don't know how to configure regulator %s\n",
	reg_np->name);
	continue;
	}

	rdata->id = i;
	rdata->initdata = of_get_regulator_init_data(
	iodev->dev, reg_np,
	&regulators[i]);
	rdata->reg_node = reg_np;
	rdata++;
	}
	of_node_put(regulators_np);

	return 0;
	}
	#else
	static int s2mpb02_pmic_dt_parse_pdata(struct s2mpb02_dev *iodev,
	struct s2mpb02_platform_data *pdata)
	{
	return 0;
	}
	#endif /* CONFIG_OF */

	static int s2mpb02_pmic_probe(struct platform_device *pdev)
	{
	struct s2mpb02_dev *iodev = dev_get_drvdata(pdev->dev.parent);
	struct s2mpb02_platform_data *pdata = iodev->pdata;
	struct regulator_config config = { };
	struct s2mpb02_data *s2mpb02;
	struct i2c_client *i2c;
	int i, ret;

	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;
	}

	if (iodev->dev->of_node) {
	ret = s2mpb02_pmic_dt_parse_pdata(iodev, pdata);
	if (ret)
	return ret;
	}

	s2mpb02 = devm_kzalloc(&pdev->dev, sizeof(struct s2mpb02_data),
	GFP_KERNEL);
	if (!s2mpb02) {
	pr_info("[%s:%d] if (!s2mpb02)\n", __FILE__, __LINE__);
	return -ENOMEM;
	}

	s2mpb02->iodev = iodev;
	s2mpb02->num_regulators = pdata->num_regulators;
	platform_set_drvdata(pdev, s2mpb02);
	i2c = s2mpb02->iodev->i2c;

	for (i = 0; i < pdata->num_regulators; i++) {
	int id = pdata->regulators[i].id;
	config.dev = &pdev->dev;
	config.init_data = pdata->regulators[i].initdata;
	config.driver_data = s2mpb02;
	config.of_node = pdata->regulators[i].reg_node;
	s2mpb02->opmode[id] = regulators[id].enable_mask;
	s2mpb02->rdev[i] = regulator_register(&regulators[id], &config);
	if (IS_ERR(s2mpb02->rdev[i])) {
	ret = PTR_ERR(s2mpb02->rdev[i]);
	dev_err(&pdev->dev, "regulator init failed for %d\n",
	id);
	s2mpb02->rdev[i] = NULL;
	goto err;
	}
	}

	pr_info("%s : s2mpb02 probe ended!\n", __func__);

	return 0;
	err:
	pr_info("[%s:%d] err:\n", __FILE__, __LINE__);
	for (i = 0; i < s2mpb02->num_regulators; i++)
	if (s2mpb02->rdev[i])
	regulator_unregister(s2mpb02->rdev[i]);

	devm_kfree(&pdev->dev, (void*)s2mpb02);

	return ret;
	}

	static int s2mpb02_pmic_remove(struct platform_device *pdev)
	{
	struct s2mpb02_data *s2mpb02 = platform_get_drvdata(pdev);
	int i;
	dev_info(&pdev->dev, "%s\n", __func__);
	for (i = 0; i < s2mpb02->num_regulators; i++)
	if (s2mpb02->rdev[i])
	regulator_unregister(s2mpb02->rdev[i]);

	return 0;
	}

	static const struct platform_device_id s2mpb02_pmic_id[] = {
	{"s2mpb02-regulator", 0},
	{},
	};
	MODULE_DEVICE_TABLE(platform, s2mpb02_pmic_id);

	static struct platform_driver s2mpb02_pmic_driver = {
	.driver = {
	.name = "s2mpb02-regulator",
	.owner = THIS_MODULE,
	.suppress_bind_attrs = true,
	},
	.probe = s2mpb02_pmic_probe,
	.remove = s2mpb02_pmic_remove,
	.id_table = s2mpb02_pmic_id,
	};

	static int __init s2mpb02_pmic_init(void)
	{
	return platform_driver_register(&s2mpb02_pmic_driver);
	}
	subsys_initcall(s2mpb02_pmic_init);

	static void __exit s2mpb02_pmic_cleanup(void)
	{
	platform_driver_unregister(&s2mpb02_pmic_driver);
	}

	module_exit(s2mpb02_pmic_cleanup);

	MODULE_DESCRIPTION("SAMSUNG s2mpb02 Regulator Driver");
	MODULE_LICENSE("GPL");