drivers/regulator/max8925-regulator.c - kernel/msm-4.9 - Gitiles

 /*
  * Regulators driver for Maxim max8925
  *
  * Copyright (C) 2009 Marvell International Ltd.
  *      Haojian Zhuang <haojian.zhuang@marvell.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/mfd/max8925.h>
 #include <linux/of.h>
 #include <linux/regulator/of_regulator.h>

 #define SD1_DVM_VMIN		850000
 #define SD1_DVM_VMAX		1000000
 #define SD1_DVM_STEP		50000
 #define SD1_DVM_SHIFT		5		/* SDCTL1 bit5 */
 #define SD1_DVM_EN		6		/* SDV1 bit 6 */

 /* bit definitions in LDO control registers */
 #define LDO_SEQ_I2C		0x7		/* Power U/D by i2c */
 #define LDO_SEQ_MASK		0x7		/* Power U/D sequence mask */
 #define LDO_SEQ_SHIFT		2		/* Power U/D sequence offset */
 #define LDO_I2C_EN		0x1		/* Enable by i2c */
 #define LDO_I2C_EN_MASK		0x1		/* Enable mask by i2c */
 #define LDO_I2C_EN_SHIFT	0		/* Enable offset by i2c */

 struct max8925_regulator_info {
 	struct regulator_desc	desc;
 	struct regulator_dev	*regulator;
 	struct i2c_client	*i2c;
 	struct max8925_chip	*chip;

 	int	vol_reg;
 	int	enable_reg;
 };

 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
 				   unsigned int selector)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 	unsigned char mask = rdev->desc->n_voltages - 1;

 	return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
 }

 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 	unsigned char data, mask;
 	int ret;

 	ret = max8925_reg_read(info->i2c, info->vol_reg);
 	if (ret < 0)
 		return ret;
 	mask = rdev->desc->n_voltages - 1;
 	data = ret & mask;

 	return data;
 }

 static int max8925_enable(struct regulator_dev *rdev)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

 	return max8925_set_bits(info->i2c, info->enable_reg,
 				LDO_SEQ_MASK << LDO_SEQ_SHIFT |
 				LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
 				LDO_SEQ_I2C << LDO_SEQ_SHIFT |
 				LDO_I2C_EN << LDO_I2C_EN_SHIFT);
 }

 static int max8925_disable(struct regulator_dev *rdev)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

 	return max8925_set_bits(info->i2c, info->enable_reg,
 				LDO_SEQ_MASK << LDO_SEQ_SHIFT |
 				LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
 				LDO_SEQ_I2C << LDO_SEQ_SHIFT);
 }

 static int max8925_is_enabled(struct regulator_dev *rdev)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 	int ldo_seq, ret;

 	ret = max8925_reg_read(info->i2c, info->enable_reg);
 	if (ret < 0)
 		return ret;
 	ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
 	if (ldo_seq != LDO_SEQ_I2C)
 		return 1;
 	else
 		return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
 }

 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
 	unsigned char data, mask;

 	if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
 		return -EINVAL;

 	data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
 	data <<= SD1_DVM_SHIFT;
 	mask = 3 << SD1_DVM_SHIFT;

 	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
 }

 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

 	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
 				1 << SD1_DVM_EN);
 }

 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
 {
 	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

 	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
 }

 static struct regulator_ops max8925_regulator_sdv_ops = {
 	.map_voltage		= regulator_map_voltage_linear,
 	.list_voltage		= regulator_list_voltage_linear,
 	.set_voltage_sel	= max8925_set_voltage_sel,
 	.get_voltage_sel	= max8925_get_voltage_sel,
 	.enable			= max8925_enable,
 	.disable		= max8925_disable,
 	.is_enabled		= max8925_is_enabled,
 	.set_suspend_voltage	= max8925_set_dvm_voltage,
 	.set_suspend_enable	= max8925_set_dvm_enable,
 	.set_suspend_disable	= max8925_set_dvm_disable,
 };

 static struct regulator_ops max8925_regulator_ldo_ops = {
 	.map_voltage		= regulator_map_voltage_linear,
 	.list_voltage		= regulator_list_voltage_linear,
 	.set_voltage_sel	= max8925_set_voltage_sel,
 	.get_voltage_sel	= max8925_get_voltage_sel,
 	.enable			= max8925_enable,
 	.disable		= max8925_disable,
 	.is_enabled		= max8925_is_enabled,
 };

 #define MAX8925_SDV(_id, min, max, step)			\
 {								\
 	.desc	= {						\
 		.name	= "SDV" #_id,				\
 		.ops	= &max8925_regulator_sdv_ops,		\
 		.type	= REGULATOR_VOLTAGE,			\
 		.id	= MAX8925_ID_SD##_id,			\
 		.owner	= THIS_MODULE,				\
 		.n_voltages = 64,				\
 		.min_uV = min * 1000,				\
 		.uV_step = step * 1000,				\
 	},							\
 	.vol_reg	= MAX8925_SDV##_id,			\
 	.enable_reg	= MAX8925_SDCTL##_id,			\
 }

 #define MAX8925_LDO(_id, min, max, step)			\
 {								\
 	.desc	= {						\
 		.name	= "LDO" #_id,				\
 		.ops	= &max8925_regulator_ldo_ops,		\
 		.type	= REGULATOR_VOLTAGE,			\
 		.id	= MAX8925_ID_LDO##_id,			\
 		.owner	= THIS_MODULE,				\
 		.n_voltages = 64,				\
 		.min_uV = min * 1000,				\
 		.uV_step = step * 1000,				\
 	},							\
 	.vol_reg	= MAX8925_LDOVOUT##_id,			\
 	.enable_reg	= MAX8925_LDOCTL##_id,			\
 }

 #ifdef CONFIG_OF
 static struct of_regulator_match max8925_regulator_matches[] = {
 	{ .name	= "SDV1",},
 	{ .name = "SDV2",},
 	{ .name = "SDV3",},
 	{ .name = "LDO1",},
 	{ .name = "LDO2",},
 	{ .name = "LDO3",},
 	{ .name = "LDO4",},
 	{ .name = "LDO5",},
 	{ .name = "LDO6",},
 	{ .name = "LDO7",},
 	{ .name = "LDO8",},
 	{ .name = "LDO9",},
 	{ .name = "LDO10",},
 	{ .name = "LDO11",},
 	{ .name = "LDO12",},
 	{ .name = "LDO13",},
 	{ .name = "LDO14",},
 	{ .name = "LDO15",},
 	{ .name = "LDO16",},
 	{ .name = "LDO17",},
 	{ .name = "LDO18",},
 	{ .name = "LDO19",},
 	{ .name = "LDO20",},
 };
 #endif

 static struct max8925_regulator_info max8925_regulator_info[] = {
 	MAX8925_SDV(1, 637.5, 1425, 12.5),
 	MAX8925_SDV(2,   650, 2225,   25),
 	MAX8925_SDV(3,   750, 3900,   50),

 	MAX8925_LDO(1,  750, 3900, 50),
 	MAX8925_LDO(2,  650, 2250, 25),
 	MAX8925_LDO(3,  650, 2250, 25),
 	MAX8925_LDO(4,  750, 3900, 50),
 	MAX8925_LDO(5,  750, 3900, 50),
 	MAX8925_LDO(6,  750, 3900, 50),
 	MAX8925_LDO(7,  750, 3900, 50),
 	MAX8925_LDO(8,  750, 3900, 50),
 	MAX8925_LDO(9,  750, 3900, 50),
 	MAX8925_LDO(10, 750, 3900, 50),
 	MAX8925_LDO(11, 750, 3900, 50),
 	MAX8925_LDO(12, 750, 3900, 50),
 	MAX8925_LDO(13, 750, 3900, 50),
 	MAX8925_LDO(14, 750, 3900, 50),
 	MAX8925_LDO(15, 750, 3900, 50),
 	MAX8925_LDO(16, 750, 3900, 50),
 	MAX8925_LDO(17, 650, 2250, 25),
 	MAX8925_LDO(18, 650, 2250, 25),
 	MAX8925_LDO(19, 750, 3900, 50),
 	MAX8925_LDO(20, 750, 3900, 50),
 };

 #ifdef CONFIG_OF
 static int max8925_regulator_dt_init(struct platform_device *pdev,
 				    struct regulator_config *config,
 				    int ridx)
 {
 	struct device_node *nproot, *np;
 	int rcount;
 	nproot = of_node_get(pdev->dev.parent->of_node);
 	if (!nproot)
 		return -ENODEV;
 	np = of_find_node_by_name(nproot, "regulators");
 	if (!np) {
 		dev_err(&pdev->dev, "failed to find regulators node\n");
 		return -ENODEV;
 	}

 	rcount = of_regulator_match(&pdev->dev, np,
 				&max8925_regulator_matches[ridx], 1);
 	of_node_put(np);
 	if (rcount < 0)
 		return -ENODEV;
 	config->init_data =	max8925_regulator_matches[ridx].init_data;
 	config->of_node = max8925_regulator_matches[ridx].of_node;

 	return 0;
 }
 #else
 #define max8925_regulator_dt_init(x, y, z)	(-1)
 #endif

 static int max8925_regulator_probe(struct platform_device *pdev)
 {
 	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
 	struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
 	struct regulator_config config = { };
 	struct max8925_regulator_info *ri;
 	struct resource *res;
 	struct regulator_dev *rdev;
 	int i, regulator_idx;

 	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "No REG resource!\n");
 		return -EINVAL;
 	}
 	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
 		ri = &max8925_regulator_info[i];
 		if (ri->vol_reg == res->start) {
 			regulator_idx = i;
 			break;
 		}
 	}

 	if (i == ARRAY_SIZE(max8925_regulator_info)) {
 		dev_err(&pdev->dev, "Failed to find regulator %llu\n",
 			(unsigned long long)res->start);
 		return -EINVAL;
 	}
 	ri->i2c = chip->i2c;
 	ri->chip = chip;

 	config.dev = &pdev->dev;
 	config.driver_data = ri;

 	if (max8925_regulator_dt_init(pdev, &config, regulator_idx))
 		if (pdata)
 			config.init_data = pdata;

 	rdev = regulator_register(&ri->desc, &config);
 	if (IS_ERR(rdev)) {
 		dev_err(&pdev->dev, "failed to register regulator %s\n",
 				ri->desc.name);
 		return PTR_ERR(rdev);
 	}

 	platform_set_drvdata(pdev, rdev);
 	return 0;
 }

 static int max8925_regulator_remove(struct platform_device *pdev)
 {
 	struct regulator_dev *rdev = platform_get_drvdata(pdev);

 	regulator_unregister(rdev);

 	return 0;
 }

 static struct platform_driver max8925_regulator_driver = {
 	.driver		= {
 		.name	= "max8925-regulator",
 		.owner	= THIS_MODULE,
 	},
 	.probe		= max8925_regulator_probe,
 	.remove		= max8925_regulator_remove,
 };

 static int __init max8925_regulator_init(void)
 {
 	return platform_driver_register(&max8925_regulator_driver);
 }
 subsys_initcall(max8925_regulator_init);

 static void __exit max8925_regulator_exit(void)
 {
 	platform_driver_unregister(&max8925_regulator_driver);
 }
 module_exit(max8925_regulator_exit);

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
 MODULE_ALIAS("platform:max8925-regulator");
	/*
	* Regulators driver for Maxim max8925
	*
	* Copyright (C) 2009 Marvell International Ltd.
	* Haojian Zhuang <haojian.zhuang@marvell.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/platform_device.h>
	#include <linux/regulator/driver.h>
	#include <linux/regulator/machine.h>
	#include <linux/mfd/max8925.h>
	#include <linux/of.h>
	#include <linux/regulator/of_regulator.h>

	#define SD1_DVM_VMIN 850000
	#define SD1_DVM_VMAX 1000000
	#define SD1_DVM_STEP 50000
	#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
	#define SD1_DVM_EN 6 /* SDV1 bit 6 */

	/* bit definitions in LDO control registers */
	#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
	#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
	#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
	#define LDO_I2C_EN 0x1 /* Enable by i2c */
	#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
	#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */

	struct max8925_regulator_info {
	struct regulator_desc desc;
	struct regulator_dev *regulator;
	struct i2c_client *i2c;
	struct max8925_chip *chip;

	int vol_reg;
	int enable_reg;
	};

	static int max8925_set_voltage_sel(struct regulator_dev *rdev,
	unsigned int selector)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char mask = rdev->desc->n_voltages - 1;

	return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
	}

	static int max8925_get_voltage_sel(struct regulator_dev *rdev)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;
	int ret;

	ret = max8925_reg_read(info->i2c, info->vol_reg);
	if (ret < 0)
	return ret;
	mask = rdev->desc->n_voltages - 1;
	data = ret & mask;

	return data;
	}

	static int max8925_enable(struct regulator_dev *rdev)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->enable_reg,
	LDO_SEQ_MASK << LDO_SEQ_SHIFT \|
	LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
	LDO_SEQ_I2C << LDO_SEQ_SHIFT \|
	LDO_I2C_EN << LDO_I2C_EN_SHIFT);
	}

	static int max8925_disable(struct regulator_dev *rdev)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->enable_reg,
	LDO_SEQ_MASK << LDO_SEQ_SHIFT \|
	LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
	LDO_SEQ_I2C << LDO_SEQ_SHIFT);
	}

	static int max8925_is_enabled(struct regulator_dev *rdev)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	int ldo_seq, ret;

	ret = max8925_reg_read(info->i2c, info->enable_reg);
	if (ret < 0)
	return ret;
	ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
	if (ldo_seq != LDO_SEQ_I2C)
	return 1;
	else
	return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
	}

	static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;

	if (uV < SD1_DVM_VMIN \|\| uV > SD1_DVM_VMAX)
	return -EINVAL;

	data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
	data <<= SD1_DVM_SHIFT;
	mask = 3 << SD1_DVM_SHIFT;

	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
	}

	static int max8925_set_dvm_enable(struct regulator_dev *rdev)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
	1 << SD1_DVM_EN);
	}

	static int max8925_set_dvm_disable(struct regulator_dev *rdev)
	{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);

	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
	}

	static struct regulator_ops max8925_regulator_sdv_ops = {
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = max8925_set_voltage_sel,
	.get_voltage_sel = max8925_get_voltage_sel,
	.enable = max8925_enable,
	.disable = max8925_disable,
	.is_enabled = max8925_is_enabled,
	.set_suspend_voltage = max8925_set_dvm_voltage,
	.set_suspend_enable = max8925_set_dvm_enable,
	.set_suspend_disable = max8925_set_dvm_disable,
	};

	static struct regulator_ops max8925_regulator_ldo_ops = {
	.map_voltage = regulator_map_voltage_linear,
	.list_voltage = regulator_list_voltage_linear,
	.set_voltage_sel = max8925_set_voltage_sel,
	.get_voltage_sel = max8925_get_voltage_sel,
	.enable = max8925_enable,
	.disable = max8925_disable,
	.is_enabled = max8925_is_enabled,
	};

	#define MAX8925_SDV(_id, min, max, step) \
	{ \
	.desc = { \
	.name = "SDV" #_id, \
	.ops = &max8925_regulator_sdv_ops, \
	.type = REGULATOR_VOLTAGE, \
	.id = MAX8925_ID_SD##_id, \
	.owner = THIS_MODULE, \
	.n_voltages = 64, \
	.min_uV = min * 1000, \
	.uV_step = step * 1000, \
	}, \
	.vol_reg = MAX8925_SDV##_id, \
	.enable_reg = MAX8925_SDCTL##_id, \
	}

	#define MAX8925_LDO(_id, min, max, step) \
	{ \
	.desc = { \
	.name = "LDO" #_id, \
	.ops = &max8925_regulator_ldo_ops, \
	.type = REGULATOR_VOLTAGE, \
	.id = MAX8925_ID_LDO##_id, \
	.owner = THIS_MODULE, \
	.n_voltages = 64, \
	.min_uV = min * 1000, \
	.uV_step = step * 1000, \
	}, \
	.vol_reg = MAX8925_LDOVOUT##_id, \
	.enable_reg = MAX8925_LDOCTL##_id, \
	}

	#ifdef CONFIG_OF
	static struct of_regulator_match max8925_regulator_matches[] = {
	{ .name = "SDV1",},
	{ .name = "SDV2",},
	{ .name = "SDV3",},
	{ .name = "LDO1",},
	{ .name = "LDO2",},
	{ .name = "LDO3",},
	{ .name = "LDO4",},
	{ .name = "LDO5",},
	{ .name = "LDO6",},
	{ .name = "LDO7",},
	{ .name = "LDO8",},
	{ .name = "LDO9",},
	{ .name = "LDO10",},
	{ .name = "LDO11",},
	{ .name = "LDO12",},
	{ .name = "LDO13",},
	{ .name = "LDO14",},
	{ .name = "LDO15",},
	{ .name = "LDO16",},
	{ .name = "LDO17",},
	{ .name = "LDO18",},
	{ .name = "LDO19",},
	{ .name = "LDO20",},
	};
	#endif

	static struct max8925_regulator_info max8925_regulator_info[] = {
	MAX8925_SDV(1, 637.5, 1425, 12.5),
	MAX8925_SDV(2, 650, 2225, 25),
	MAX8925_SDV(3, 750, 3900, 50),

	MAX8925_LDO(1, 750, 3900, 50),
	MAX8925_LDO(2, 650, 2250, 25),
	MAX8925_LDO(3, 650, 2250, 25),
	MAX8925_LDO(4, 750, 3900, 50),
	MAX8925_LDO(5, 750, 3900, 50),
	MAX8925_LDO(6, 750, 3900, 50),
	MAX8925_LDO(7, 750, 3900, 50),
	MAX8925_LDO(8, 750, 3900, 50),
	MAX8925_LDO(9, 750, 3900, 50),
	MAX8925_LDO(10, 750, 3900, 50),
	MAX8925_LDO(11, 750, 3900, 50),
	MAX8925_LDO(12, 750, 3900, 50),
	MAX8925_LDO(13, 750, 3900, 50),
	MAX8925_LDO(14, 750, 3900, 50),
	MAX8925_LDO(15, 750, 3900, 50),
	MAX8925_LDO(16, 750, 3900, 50),
	MAX8925_LDO(17, 650, 2250, 25),
	MAX8925_LDO(18, 650, 2250, 25),
	MAX8925_LDO(19, 750, 3900, 50),
	MAX8925_LDO(20, 750, 3900, 50),
	};

	#ifdef CONFIG_OF
	static int max8925_regulator_dt_init(struct platform_device *pdev,
	struct regulator_config *config,
	int ridx)
	{
	struct device_node nproot, np;
	int rcount;
	nproot = of_node_get(pdev->dev.parent->of_node);
	if (!nproot)
	return -ENODEV;
	np = of_find_node_by_name(nproot, "regulators");
	if (!np) {
	dev_err(&pdev->dev, "failed to find regulators node\n");
	return -ENODEV;
	}

	rcount = of_regulator_match(&pdev->dev, np,
	&max8925_regulator_matches[ridx], 1);
	of_node_put(np);
	if (rcount < 0)
	return -ENODEV;
	config->init_data = max8925_regulator_matches[ridx].init_data;
	config->of_node = max8925_regulator_matches[ridx].of_node;

	return 0;
	}
	#else
	#define max8925_regulator_dt_init(x, y, z) (-1)
	#endif

	static int max8925_regulator_probe(struct platform_device *pdev)
	{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
	struct regulator_config config = { };
	struct max8925_regulator_info *ri;
	struct resource *res;
	struct regulator_dev *rdev;
	int i, regulator_idx;

	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
	if (!res) {
	dev_err(&pdev->dev, "No REG resource!\n");
	return -EINVAL;
	}
	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
	ri = &max8925_regulator_info[i];
	if (ri->vol_reg == res->start) {
	regulator_idx = i;
	break;
	}
	}

	if (i == ARRAY_SIZE(max8925_regulator_info)) {
	dev_err(&pdev->dev, "Failed to find regulator %llu\n",
	(unsigned long long)res->start);
	return -EINVAL;
	}
	ri->i2c = chip->i2c;
	ri->chip = chip;

	config.dev = &pdev->dev;
	config.driver_data = ri;

	if (max8925_regulator_dt_init(pdev, &config, regulator_idx))
	if (pdata)
	config.init_data = pdata;

	rdev = regulator_register(&ri->desc, &config);
	if (IS_ERR(rdev)) {
	dev_err(&pdev->dev, "failed to register regulator %s\n",
	ri->desc.name);
	return PTR_ERR(rdev);
	}

	platform_set_drvdata(pdev, rdev);
	return 0;
	}

	static int max8925_regulator_remove(struct platform_device *pdev)
	{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	regulator_unregister(rdev);

	return 0;
	}

	static struct platform_driver max8925_regulator_driver = {
	.driver = {
	.name = "max8925-regulator",
	.owner = THIS_MODULE,
	},
	.probe = max8925_regulator_probe,
	.remove = max8925_regulator_remove,
	};

	static int __init max8925_regulator_init(void)
	{
	return platform_driver_register(&max8925_regulator_driver);
	}
	subsys_initcall(max8925_regulator_init);

	static void __exit max8925_regulator_exit(void)
	{
	platform_driver_unregister(&max8925_regulator_driver);
	}
	module_exit(max8925_regulator_exit);

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
	MODULE_ALIAS("platform:max8925-regulator");