[deliverable/linux.git] / drivers / regulator / max8925-regulator.c

/*
 * 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>

#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	max_uV;
	int	vol_reg;
	int	enable_reg;
};

static inline int check_range(struct max8925_regulator_info *info,
			      int min_uV, int max_uV)
{
	if (min_uV < info->desc.min_uV || min_uV > info->max_uV)
		return -EINVAL;

	return 0;
}

static int max8925_set_voltage(struct regulator_dev *rdev,
			       int min_uV, int max_uV, unsigned int *selector)
{
	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;

	if (check_range(info, min_uV, max_uV)) {
		dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
			min_uV, max_uV);
		return -EINVAL;
	}
	data = DIV_ROUND_UP(min_uV - info->desc.min_uV, info->desc.uV_step);
	*selector = data;
	mask = rdev->desc->n_voltages - 1;

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

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 = {
	.list_voltage		= regulator_list_voltage_linear,
	.set_voltage		= max8925_set_voltage,
	.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 = {
	.list_voltage		= regulator_list_voltage_linear,
	.set_voltage		= max8925_set_voltage,
	.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,				\
	},							\
	.max_uV		= max * 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,				\
	},							\
	.max_uV		= max * 1000,				\
	.vol_reg	= MAX8925_LDOVOUT##_id,			\
	.enable_reg	= MAX8925_LDOCTL##_id,			\
}

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),
};

static struct max8925_regulator_info * __devinit find_regulator_info(int id)
{
	struct max8925_regulator_info *ri;
	int i;

	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
		ri = &max8925_regulator_info[i];
		if (ri->desc.id == id)
			return ri;
	}
	return NULL;
}

static int __devinit max8925_regulator_probe(struct platform_device *pdev)
{
	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	struct max8925_platform_data *pdata = chip->dev->platform_data;
	struct regulator_config config = { };
	struct max8925_regulator_info *ri;
	struct regulator_dev *rdev;

	ri = find_regulator_info(pdev->id);
	if (ri == NULL) {
		dev_err(&pdev->dev, "invalid regulator ID specified\n");
		return -EINVAL;
	}
	ri->i2c = chip->i2c;
	ri->chip = chip;

	config.dev = &pdev->dev;
	config.init_data = pdata->regulator[pdev->id];
	config.driver_data = ri;

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

	platform_set_drvdata(pdev, NULL);
	regulator_unregister(rdev);

	return 0;
}

static struct platform_driver max8925_regulator_driver = {
	.driver		= {
		.name	= "max8925-regulator",
		.owner	= THIS_MODULE,
	},
	.probe		= max8925_regulator_probe,
	.remove		= __devexit_p(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");
Commit	Line	Data
08ff6f2a HZ	1	/*
	2	* Regulators driver for Maxim max8925
	3	*
	4	* Copyright (C) 2009 Marvell International Ltd.
	5	* Haojian Zhuang <haojian.zhuang@marvell.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/kernel.h>
65602c32	12	#include <linux/module.h>
08ff6f2a HZ	13	#include <linux/init.h>
	14	#include <linux/err.h>
	15	#include <linux/i2c.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/regulator/driver.h>
	18	#include <linux/regulator/machine.h>
	19	#include <linux/mfd/max8925.h>
	20
	21	#define SD1_DVM_VMIN 850000
	22	#define SD1_DVM_VMAX 1000000
	23	#define SD1_DVM_STEP 50000
	24	#define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
	25	#define SD1_DVM_EN 6 /* SDV1 bit 6 */
	26
65364e9a KL	27	/* bit definitions in LDO control registers */
	28	#define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
	29	#define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
	30	#define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
	31	#define LDO_I2C_EN 0x1 /* Enable by i2c */
	32	#define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
	33	#define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
db13c040	34
08ff6f2a HZ	35	struct max8925_regulator_info {
	36	struct regulator_desc desc;
	37	struct regulator_dev *regulator;
	38	struct i2c_client *i2c;
	39	struct max8925_chip *chip;
	40
08ff6f2a	41	int max_uV;
08ff6f2a	42	int vol_reg;
08ff6f2a HZ	43	int enable_reg;
	44	};
	45
	46	static inline int check_range(struct max8925_regulator_info *info,
	47	int min_uV, int max_uV)
	48	{
4093e739	49	if (min_uV < info->desc.min_uV \|\| min_uV > info->max_uV)
08ff6f2a HZ	50	return -EINVAL;
	51
	52	return 0;
	53	}
	54
08ff6f2a	55	static int max8925_set_voltage(struct regulator_dev *rdev,
3a93f2a9	56	int min_uV, int max_uV, unsigned int *selector)
08ff6f2a HZ	57	{
	58	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	59	unsigned char data, mask;
	60
	61	if (check_range(info, min_uV, max_uV)) {
	62	dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n",
	63	min_uV, max_uV);
	64	return -EINVAL;
	65	}
4093e739	66	data = DIV_ROUND_UP(min_uV - info->desc.min_uV, info->desc.uV_step);
3a93f2a9	67	*selector = data;
7f52ba77	68	mask = rdev->desc->n_voltages - 1;
08ff6f2a HZ	69
	70	return max8925_set_bits(info->i2c, info->vol_reg, mask, data);
	71	}
	72
3c8983b9	73	static int max8925_get_voltage_sel(struct regulator_dev *rdev)
08ff6f2a HZ	74	{
	75	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	76	unsigned char data, mask;
	77	int ret;
	78
	79	ret = max8925_reg_read(info->i2c, info->vol_reg);
	80	if (ret < 0)
	81	return ret;
7f52ba77 AL	82	mask = rdev->desc->n_voltages - 1;
7f52ba77 AL	83	data = ret & mask;
08ff6f2a	84
3c8983b9	85	return data;
08ff6f2a HZ	86	}
	87
	88	static int max8925_enable(struct regulator_dev *rdev)
	89	{
	90	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	91
	92	return max8925_set_bits(info->i2c, info->enable_reg,
65364e9a KL	93	LDO_SEQ_MASK << LDO_SEQ_SHIFT \|
	94	LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
	95	LDO_SEQ_I2C << LDO_SEQ_SHIFT \|
	96	LDO_I2C_EN << LDO_I2C_EN_SHIFT);
08ff6f2a HZ	97	}
	98
	99	static int max8925_disable(struct regulator_dev *rdev)
	100	{
	101	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	102
	103	return max8925_set_bits(info->i2c, info->enable_reg,
65364e9a KL	104	LDO_SEQ_MASK << LDO_SEQ_SHIFT \|
	105	LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
	106	LDO_SEQ_I2C << LDO_SEQ_SHIFT);
08ff6f2a HZ	107	}
	108
	109	static int max8925_is_enabled(struct regulator_dev *rdev)
	110	{
	111	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
65364e9a	112	int ldo_seq, ret;
08ff6f2a	113
4b99fef0	114	ret = max8925_reg_read(info->i2c, info->enable_reg);
08ff6f2a HZ	115	if (ret < 0)
08ff6f2a HZ	116	return ret;
65364e9a KL	117	ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
	118	if (ldo_seq != LDO_SEQ_I2C)
	119	return 1;
	120	else
	121	return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
08ff6f2a HZ	122	}
	123
	124	static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
	125	{
	126	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	127	unsigned char data, mask;
	128
	129	if (uV < SD1_DVM_VMIN \|\| uV > SD1_DVM_VMAX)
	130	return -EINVAL;
	131
5db6d09a	132	data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
08ff6f2a HZ	133	data <<= SD1_DVM_SHIFT;
	134	mask = 3 << SD1_DVM_SHIFT;
	135
	136	return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
	137	}
	138
	139	static int max8925_set_dvm_enable(struct regulator_dev *rdev)
	140	{
	141	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	142
	143	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
	144	1 << SD1_DVM_EN);
	145	}
	146
	147	static int max8925_set_dvm_disable(struct regulator_dev *rdev)
	148	{
	149	struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
	150
	151	return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
	152	}
	153
	154	static struct regulator_ops max8925_regulator_sdv_ops = {
4093e739	155	.list_voltage = regulator_list_voltage_linear,
08ff6f2a	156	.set_voltage = max8925_set_voltage,
3c8983b9	157	.get_voltage_sel = max8925_get_voltage_sel,
08ff6f2a HZ	158	.enable = max8925_enable,
	159	.disable = max8925_disable,
	160	.is_enabled = max8925_is_enabled,
	161	.set_suspend_voltage = max8925_set_dvm_voltage,
	162	.set_suspend_enable = max8925_set_dvm_enable,
	163	.set_suspend_disable = max8925_set_dvm_disable,
	164	};
	165
	166	static struct regulator_ops max8925_regulator_ldo_ops = {
4093e739	167	.list_voltage = regulator_list_voltage_linear,
08ff6f2a	168	.set_voltage = max8925_set_voltage,
3c8983b9	169	.get_voltage_sel = max8925_get_voltage_sel,
08ff6f2a HZ	170	.enable = max8925_enable,
	171	.disable = max8925_disable,
	172	.is_enabled = max8925_is_enabled,
	173	};
	174
	175	#define MAX8925_SDV(_id, min, max, step) \
	176	{ \
	177	.desc = { \
	178	.name = "SDV" #_id, \
	179	.ops = &max8925_regulator_sdv_ops, \
	180	.type = REGULATOR_VOLTAGE, \
	181	.id = MAX8925_ID_SD##_id, \
	182	.owner = THIS_MODULE, \
7f52ba77	183	.n_voltages = 64, \
4093e739 AL	184	.min_uV = min * 1000, \
4093e739 AL	185	.uV_step = step * 1000, \
08ff6f2a	186	}, \
08ff6f2a	187	.max_uV = max * 1000, \
08ff6f2a	188	.vol_reg = MAX8925_SDV##_id, \
08ff6f2a	189	.enable_reg = MAX8925_SDCTL##_id, \
08ff6f2a HZ	190	}
	191
	192	#define MAX8925_LDO(_id, min, max, step) \
	193	{ \
	194	.desc = { \
	195	.name = "LDO" #_id, \
	196	.ops = &max8925_regulator_ldo_ops, \
	197	.type = REGULATOR_VOLTAGE, \
	198	.id = MAX8925_ID_LDO##_id, \
	199	.owner = THIS_MODULE, \
7f52ba77	200	.n_voltages = 64, \
4093e739 AL	201	.min_uV = min * 1000, \
4093e739 AL	202	.uV_step = step * 1000, \
08ff6f2a	203	}, \
08ff6f2a	204	.max_uV = max * 1000, \
08ff6f2a	205	.vol_reg = MAX8925_LDOVOUT##_id, \
08ff6f2a	206	.enable_reg = MAX8925_LDOCTL##_id, \
08ff6f2a HZ	207	}
	208
	209	static struct max8925_regulator_info max8925_regulator_info[] = {
	210	MAX8925_SDV(1, 637.5, 1425, 12.5),
	211	MAX8925_SDV(2, 650, 2225, 25),
	212	MAX8925_SDV(3, 750, 3900, 50),
	213
	214	MAX8925_LDO(1, 750, 3900, 50),
	215	MAX8925_LDO(2, 650, 2250, 25),
	216	MAX8925_LDO(3, 650, 2250, 25),
	217	MAX8925_LDO(4, 750, 3900, 50),
	218	MAX8925_LDO(5, 750, 3900, 50),
	219	MAX8925_LDO(6, 750, 3900, 50),
	220	MAX8925_LDO(7, 750, 3900, 50),
	221	MAX8925_LDO(8, 750, 3900, 50),
	222	MAX8925_LDO(9, 750, 3900, 50),
	223	MAX8925_LDO(10, 750, 3900, 50),
	224	MAX8925_LDO(11, 750, 3900, 50),
	225	MAX8925_LDO(12, 750, 3900, 50),
	226	MAX8925_LDO(13, 750, 3900, 50),
	227	MAX8925_LDO(14, 750, 3900, 50),
	228	MAX8925_LDO(15, 750, 3900, 50),
	229	MAX8925_LDO(16, 750, 3900, 50),
	230	MAX8925_LDO(17, 650, 2250, 25),
	231	MAX8925_LDO(18, 650, 2250, 25),
	232	MAX8925_LDO(19, 750, 3900, 50),
	233	MAX8925_LDO(20, 750, 3900, 50),
	234	};
	235
3fff6c04	236	static struct max8925_regulator_info * __devinit find_regulator_info(int id)
08ff6f2a HZ	237	{
	238	struct max8925_regulator_info *ri;
	239	int i;
	240
	241	for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
	242	ri = &max8925_regulator_info[i];
	243	if (ri->desc.id == id)
	244	return ri;
	245	}
	246	return NULL;
	247	}
	248
	249	static int __devinit max8925_regulator_probe(struct platform_device *pdev)
	250	{
	251	struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
	252	struct max8925_platform_data *pdata = chip->dev->platform_data;
c172708d	253	struct regulator_config config = { };
3fff6c04	254	struct max8925_regulator_info *ri;
08ff6f2a HZ	255	struct regulator_dev *rdev;
	256
	257	ri = find_regulator_info(pdev->id);
	258	if (ri == NULL) {
	259	dev_err(&pdev->dev, "invalid regulator ID specified\n");
	260	return -EINVAL;
	261	}
	262	ri->i2c = chip->i2c;
	263	ri->chip = chip;
	264
c172708d MB	265	config.dev = &pdev->dev;
	266	config.init_data = pdata->regulator[pdev->id];
	267	config.driver_data = ri;
	268
	269	rdev = regulator_register(&ri->desc, &config);
08ff6f2a HZ	270	if (IS_ERR(rdev)) {
	271	dev_err(&pdev->dev, "failed to register regulator %s\n",
	272	ri->desc.name);
	273	return PTR_ERR(rdev);
	274	}
	275
	276	platform_set_drvdata(pdev, rdev);
	277	return 0;
	278	}
	279
	280	static int __devexit max8925_regulator_remove(struct platform_device *pdev)
	281	{
	282	struct regulator_dev *rdev = platform_get_drvdata(pdev);
	283
3fff6c04	284	platform_set_drvdata(pdev, NULL);
08ff6f2a	285	regulator_unregister(rdev);
3fff6c04	286
08ff6f2a HZ	287	return 0;
	288	}
	289
	290	static struct platform_driver max8925_regulator_driver = {
	291	.driver = {
	292	.name = "max8925-regulator",
	293	.owner = THIS_MODULE,
	294	},
	295	.probe = max8925_regulator_probe,
	296	.remove = __devexit_p(max8925_regulator_remove),
	297	};
	298
	299	static int __init max8925_regulator_init(void)
	300	{
	301	return platform_driver_register(&max8925_regulator_driver);
	302	}
	303	subsys_initcall(max8925_regulator_init);
	304
	305	static void __exit max8925_regulator_exit(void)
	306	{
	307	platform_driver_unregister(&max8925_regulator_driver);
	308	}
	309	module_exit(max8925_regulator_exit);
	310
	311	MODULE_LICENSE("GPL");
	312	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	313	MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
	314	MODULE_ALIAS("platform:max8925-regulator");