[deliverable/linux.git] / drivers / regulator / max8649.c

/*
 * Regulators driver for Maxim max8649
 *
 * Copyright (C) 2009-2010 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/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/regulator/max8649.h>
#include <linux/regmap.h>

#define MAX8649_DCDC_VMIN	750000		/* uV */
#define MAX8649_DCDC_VMAX	1380000		/* uV */
#define MAX8649_DCDC_STEP	10000		/* uV */
#define MAX8649_VOL_MASK	0x3f

/* Registers */
#define MAX8649_MODE0		0x00
#define MAX8649_MODE1		0x01
#define MAX8649_MODE2		0x02
#define MAX8649_MODE3		0x03
#define MAX8649_CONTROL		0x04
#define MAX8649_SYNC		0x05
#define MAX8649_RAMP		0x06
#define MAX8649_CHIP_ID1	0x08
#define MAX8649_CHIP_ID2	0x09

/* Bits */
#define MAX8649_EN_PD		(1 << 7)
#define MAX8649_VID0_PD		(1 << 6)
#define MAX8649_VID1_PD		(1 << 5)
#define MAX8649_VID_MASK	(3 << 5)

#define MAX8649_FORCE_PWM	(1 << 7)
#define MAX8649_SYNC_EXTCLK	(1 << 6)

#define MAX8649_EXT_MASK	(3 << 6)

#define MAX8649_RAMP_MASK	(7 << 5)
#define MAX8649_RAMP_DOWN	(1 << 1)

struct max8649_regulator_info {
	struct regulator_dev	*regulator;
	struct device		*dev;
	struct regmap		*regmap;

	unsigned	mode:2;	/* bit[1:0] = VID1, VID0 */
	unsigned	extclk_freq:2;
	unsigned	extclk:1;
	unsigned	ramp_timing:3;
	unsigned	ramp_down:1;
};

/* I2C operations */

static inline int check_range(int min_uV, int max_uV)
{
	if ((min_uV < MAX8649_DCDC_VMIN) || (max_uV > MAX8649_DCDC_VMAX)
		|| (min_uV > max_uV))
		return -EINVAL;
	return 0;
}

static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)
{
	return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP);
}

static int max8649_set_voltage(struct regulator_dev *rdev,
			       int min_uV, int max_uV, unsigned *selector)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned char data, mask;

	if (check_range(min_uV, max_uV)) {
		dev_err(info->dev, "invalid voltage range (%d, %d) uV\n",
			min_uV, max_uV);
		return -EINVAL;
	}
	data = DIV_ROUND_UP(min_uV - MAX8649_DCDC_VMIN, MAX8649_DCDC_STEP);
	mask = MAX8649_VOL_MASK;
	*selector = data & mask;

	return regmap_update_bits(info->regmap, rdev->desc->vsel_reg, mask,
				  data);
}

/* EN_PD means pulldown on EN input */
static int max8649_enable(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
}

/*
 * Applied internal pulldown resistor on EN input pin.
 * If pulldown EN pin outside, it would be better.
 */
static int max8649_disable(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
				MAX8649_EN_PD);
}

static int max8649_is_enabled(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret;

	ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
	if (ret != 0)
		return ret;
	return !((unsigned char)val & MAX8649_EN_PD);
}

static int max8649_enable_time(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	int voltage, rate, ret;
	unsigned int val;

	/* get voltage */
	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
	if (ret != 0)
		return ret;
	val &= MAX8649_VOL_MASK;
	voltage = max8649_list_voltage(rdev, (unsigned char)val); /* uV */

	/* get rate */
	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
	if (ret != 0)
		return ret;
	ret = (val & MAX8649_RAMP_MASK) >> 5;
	rate = (32 * 1000) >> ret;	/* uV/uS */

	return DIV_ROUND_UP(voltage, rate);
}

static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);

	switch (mode) {
	case REGULATOR_MODE_FAST:
		regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
				   MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
				   MAX8649_FORCE_PWM, 0);
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned int max8649_get_mode(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned int val;
	int ret;

	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
	if (ret != 0)
		return ret;
	if (val & MAX8649_FORCE_PWM)
		return REGULATOR_MODE_FAST;
	return REGULATOR_MODE_NORMAL;
}

static struct regulator_ops max8649_dcdc_ops = {
	.set_voltage	= max8649_set_voltage,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage	= max8649_list_voltage,
	.enable		= max8649_enable,
	.disable	= max8649_disable,
	.is_enabled	= max8649_is_enabled,
	.enable_time	= max8649_enable_time,
	.set_mode	= max8649_set_mode,
	.get_mode	= max8649_get_mode,

};

static struct regulator_desc dcdc_desc = {
	.name		= "max8649",
	.ops		= &max8649_dcdc_ops,
	.type		= REGULATOR_VOLTAGE,
	.n_voltages	= 1 << 6,
	.owner		= THIS_MODULE,
	.vsel_mask	= MAX8649_VOL_MASK,
};

static struct regmap_config max8649_regmap_config = {
	.reg_bits = 8,
	.val_bits = 8,
};

static int __devinit max8649_regulator_probe(struct i2c_client *client,
					     const struct i2c_device_id *id)
{
	struct max8649_platform_data *pdata = client->dev.platform_data;
	struct max8649_regulator_info *info = NULL;
	struct regulator_config config = { };
	unsigned int val;
	unsigned char data;
	int ret;

	info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
			    GFP_KERNEL);
	if (!info) {
		dev_err(&client->dev, "No enough memory\n");
		return -ENOMEM;
	}

	info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
	if (IS_ERR(info->regmap)) {
		ret = PTR_ERR(info->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
		return ret;
	}

	info->dev = &client->dev;
	i2c_set_clientdata(client, info);

	info->mode = pdata->mode;
	switch (info->mode) {
	case 0:
		dcdc_desc.vsel_reg = MAX8649_MODE0;
		break;
	case 1:
		dcdc_desc.vsel_reg = MAX8649_MODE1;
		break;
	case 2:
		dcdc_desc.vsel_reg = MAX8649_MODE2;
		break;
	case 3:
		dcdc_desc.vsel_reg = MAX8649_MODE3;
		break;
	default:
		break;
	}

	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
	if (ret != 0) {
		dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
			ret);
		return ret;
	}
	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);

	/* enable VID0 & VID1 */
	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);

	/* enable/disable external clock synchronization */
	info->extclk = pdata->extclk;
	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
	regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
			   MAX8649_SYNC_EXTCLK, data);
	if (info->extclk) {
		/* set external clock frequency */
		info->extclk_freq = pdata->extclk_freq;
		regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
				   info->extclk_freq << 6);
	}

	if (pdata->ramp_timing) {
		info->ramp_timing = pdata->ramp_timing;
		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
				   info->ramp_timing << 5);
	}

	info->ramp_down = pdata->ramp_down;
	if (info->ramp_down) {
		regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
				   MAX8649_RAMP_DOWN);
	}

	config.dev = &client->dev;
	config.init_data = pdata->regulator;
	config.driver_data = info;

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

	return 0;
}

static int __devexit max8649_regulator_remove(struct i2c_client *client)
{
	struct max8649_regulator_info *info = i2c_get_clientdata(client);

	if (info) {
		if (info->regulator)
			regulator_unregister(info->regulator);
	}

	return 0;
}

static const struct i2c_device_id max8649_id[] = {
	{ "max8649", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max8649_id);

static struct i2c_driver max8649_driver = {
	.probe		= max8649_regulator_probe,
	.remove		= __devexit_p(max8649_regulator_remove),
	.driver		= {
		.name	= "max8649",
	},
	.id_table	= max8649_id,
};

static int __init max8649_init(void)
{
	return i2c_add_driver(&max8649_driver);
}
subsys_initcall(max8649_init);

static void __exit max8649_exit(void)
{
	i2c_del_driver(&max8649_driver);
}
module_exit(max8649_exit);

/* Module information */
MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
a71b797f HZ	1	/*
	2	* Regulators driver for Maxim max8649
	3	*
	4	* Copyright (C) 2009-2010 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>
	12	#include <linux/module.h>
	13	#include <linux/err.h>
	14	#include <linux/i2c.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/regulator/driver.h>
5a0e3ad6	17	#include <linux/slab.h>
a71b797f	18	#include <linux/regulator/max8649.h>
c5b68d47	19	#include <linux/regmap.h>
a71b797f HZ	20
	21	#define MAX8649_DCDC_VMIN 750000 /* uV */
	22	#define MAX8649_DCDC_VMAX 1380000 /* uV */
	23	#define MAX8649_DCDC_STEP 10000 /* uV */
	24	#define MAX8649_VOL_MASK 0x3f
	25
	26	/* Registers */
	27	#define MAX8649_MODE0 0x00
	28	#define MAX8649_MODE1 0x01
	29	#define MAX8649_MODE2 0x02
	30	#define MAX8649_MODE3 0x03
	31	#define MAX8649_CONTROL 0x04
	32	#define MAX8649_SYNC 0x05
	33	#define MAX8649_RAMP 0x06
	34	#define MAX8649_CHIP_ID1 0x08
	35	#define MAX8649_CHIP_ID2 0x09
	36
	37	/* Bits */
	38	#define MAX8649_EN_PD (1 << 7)
	39	#define MAX8649_VID0_PD (1 << 6)
	40	#define MAX8649_VID1_PD (1 << 5)
	41	#define MAX8649_VID_MASK (3 << 5)
	42
	43	#define MAX8649_FORCE_PWM (1 << 7)
	44	#define MAX8649_SYNC_EXTCLK (1 << 6)
	45
	46	#define MAX8649_EXT_MASK (3 << 6)
	47
	48	#define MAX8649_RAMP_MASK (7 << 5)
	49	#define MAX8649_RAMP_DOWN (1 << 1)
	50
	51	struct max8649_regulator_info {
	52	struct regulator_dev *regulator;
a71b797f	53	struct device *dev;
c5b68d47	54	struct regmap *regmap;
a71b797f	55
a71b797f HZ	56	unsigned mode:2; /* bit[1:0] = VID1, VID0 */
	57	unsigned extclk_freq:2;
	58	unsigned extclk:1;
	59	unsigned ramp_timing:3;
	60	unsigned ramp_down:1;
	61	};
	62
	63	/* I2C operations */
	64
a71b797f HZ	65	static inline int check_range(int min_uV, int max_uV)
	66	{
	67	if ((min_uV < MAX8649_DCDC_VMIN) \|\| (max_uV > MAX8649_DCDC_VMAX)
	68	\|\| (min_uV > max_uV))
	69	return -EINVAL;
	70	return 0;
	71	}
	72
	73	static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)
	74	{
	75	return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP);
	76	}
	77
a71b797f	78	static int max8649_set_voltage(struct regulator_dev *rdev,
3a93f2a9	79	int min_uV, int max_uV, unsigned *selector)
a71b797f HZ	80	{
	81	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	82	unsigned char data, mask;
	83
	84	if (check_range(min_uV, max_uV)) {
	85	dev_err(info->dev, "invalid voltage range (%d, %d) uV\n",
	86	min_uV, max_uV);
	87	return -EINVAL;
	88	}
21c9e5f1	89	data = DIV_ROUND_UP(min_uV - MAX8649_DCDC_VMIN, MAX8649_DCDC_STEP);
a71b797f	90	mask = MAX8649_VOL_MASK;
3a93f2a9	91	*selector = data & mask;
a71b797f	92
817d8c2d AL	93	return regmap_update_bits(info->regmap, rdev->desc->vsel_reg, mask,
817d8c2d AL	94	data);
a71b797f HZ	95	}
	96
	97	/* EN_PD means pulldown on EN input */
	98	static int max8649_enable(struct regulator_dev *rdev)
	99	{
	100	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	101	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
a71b797f HZ	102	}
	103
	104	/*
	105	* Applied internal pulldown resistor on EN input pin.
	106	* If pulldown EN pin outside, it would be better.
	107	*/
	108	static int max8649_disable(struct regulator_dev *rdev)
	109	{
	110	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	111	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
a71b797f HZ	112	MAX8649_EN_PD);
	113	}
	114
	115	static int max8649_is_enabled(struct regulator_dev *rdev)
	116	{
	117	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	118	unsigned int val;
a71b797f HZ	119	int ret;
a71b797f HZ	120
c5b68d47 JC	121	ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
c5b68d47 JC	122	if (ret != 0)
a71b797f	123	return ret;
c5b68d47	124	return !((unsigned char)val & MAX8649_EN_PD);
a71b797f HZ	125	}
	126
	127	static int max8649_enable_time(struct regulator_dev *rdev)
	128	{
	129	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	130	int voltage, rate, ret;
c5b68d47	131	unsigned int val;
a71b797f HZ	132
a71b797f HZ	133	/* get voltage */
817d8c2d	134	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
c5b68d47	135	if (ret != 0)
a71b797f	136	return ret;
c5b68d47	137	val &= MAX8649_VOL_MASK;
9fc886a1	138	voltage = max8649_list_voltage(rdev, (unsigned char)val); /* uV */
a71b797f HZ	139
a71b797f HZ	140	/* get rate */
c5b68d47 JC	141	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
c5b68d47 JC	142	if (ret != 0)
a71b797f	143	return ret;
c5b68d47	144	ret = (val & MAX8649_RAMP_MASK) >> 5;
a71b797f HZ	145	rate = (32 * 1000) >> ret; /* uV/uS */
a71b797f HZ	146
e69c4997	147	return DIV_ROUND_UP(voltage, rate);
a71b797f HZ	148	}
	149
	150	static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
	151	{
	152	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	153
	154	switch (mode) {
	155	case REGULATOR_MODE_FAST:
817d8c2d AL	156	regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
817d8c2d AL	157	MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
a71b797f HZ	158	break;
a71b797f HZ	159	case REGULATOR_MODE_NORMAL:
817d8c2d	160	regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
c5b68d47	161	MAX8649_FORCE_PWM, 0);
a71b797f HZ	162	break;
	163	default:
	164	return -EINVAL;
	165	}
	166	return 0;
	167	}
	168
	169	static unsigned int max8649_get_mode(struct regulator_dev *rdev)
	170	{
	171	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	172	unsigned int val;
a71b797f HZ	173	int ret;
a71b797f HZ	174
817d8c2d	175	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
c5b68d47 JC	176	if (ret != 0)
	177	return ret;
	178	if (val & MAX8649_FORCE_PWM)
a71b797f HZ	179	return REGULATOR_MODE_FAST;
	180	return REGULATOR_MODE_NORMAL;
	181	}
	182
	183	static struct regulator_ops max8649_dcdc_ops = {
	184	.set_voltage = max8649_set_voltage,
817d8c2d	185	.get_voltage_sel = regulator_get_voltage_sel_regmap,
a71b797f HZ	186	.list_voltage = max8649_list_voltage,
	187	.enable = max8649_enable,
	188	.disable = max8649_disable,
	189	.is_enabled = max8649_is_enabled,
	190	.enable_time = max8649_enable_time,
	191	.set_mode = max8649_set_mode,
	192	.get_mode = max8649_get_mode,
	193
	194	};
	195
817d8c2d	196	static struct regulator_desc dcdc_desc = {
a71b797f HZ	197	.name = "max8649",
	198	.ops = &max8649_dcdc_ops,
	199	.type = REGULATOR_VOLTAGE,
	200	.n_voltages = 1 << 6,
	201	.owner = THIS_MODULE,
817d8c2d	202	.vsel_mask = MAX8649_VOL_MASK,
a71b797f HZ	203	};
a71b797f HZ	204
c5b68d47 JC	205	static struct regmap_config max8649_regmap_config = {
	206	.reg_bits = 8,
	207	.val_bits = 8,
	208	};
	209
a71b797f HZ	210	static int __devinit max8649_regulator_probe(struct i2c_client *client,
	211	const struct i2c_device_id *id)
	212	{
	213	struct max8649_platform_data *pdata = client->dev.platform_data;
	214	struct max8649_regulator_info *info = NULL;
c172708d	215	struct regulator_config config = { };
c5b68d47	216	unsigned int val;
a71b797f HZ	217	unsigned char data;
	218	int ret;
	219
dc553a79 AL	220	info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
dc553a79 AL	221	GFP_KERNEL);
a71b797f HZ	222	if (!info) {
	223	dev_err(&client->dev, "No enough memory\n");
	224	return -ENOMEM;
	225	}
	226
dc553a79	227	info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
c5b68d47 JC	228	if (IS_ERR(info->regmap)) {
	229	ret = PTR_ERR(info->regmap);
	230	dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
dc553a79	231	return ret;
c5b68d47 JC	232	}
c5b68d47 JC	233
a71b797f	234	info->dev = &client->dev;
a71b797f HZ	235	i2c_set_clientdata(client, info);
	236
	237	info->mode = pdata->mode;
	238	switch (info->mode) {
	239	case 0:
817d8c2d	240	dcdc_desc.vsel_reg = MAX8649_MODE0;
a71b797f HZ	241	break;
a71b797f HZ	242	case 1:
817d8c2d	243	dcdc_desc.vsel_reg = MAX8649_MODE1;
a71b797f HZ	244	break;
a71b797f HZ	245	case 2:
817d8c2d	246	dcdc_desc.vsel_reg = MAX8649_MODE2;
a71b797f HZ	247	break;
a71b797f HZ	248	case 3:
817d8c2d	249	dcdc_desc.vsel_reg = MAX8649_MODE3;
a71b797f HZ	250	break;
	251	default:
	252	break;
	253	}
	254
c5b68d47 JC	255	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
c5b68d47 JC	256	if (ret != 0) {
a71b797f HZ	257	dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
a71b797f HZ	258	ret);
dc553a79	259	return ret;
a71b797f	260	}
da7de6a1	261	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
a71b797f HZ	262
a71b797f HZ	263	/* enable VID0 & VID1 */
c5b68d47	264	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
a71b797f HZ	265
	266	/* enable/disable external clock synchronization */
	267	info->extclk = pdata->extclk;
	268	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
817d8c2d AL	269	regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
817d8c2d AL	270	MAX8649_SYNC_EXTCLK, data);
a71b797f HZ	271	if (info->extclk) {
	272	/* set external clock frequency */
	273	info->extclk_freq = pdata->extclk_freq;
c5b68d47 JC	274	regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
c5b68d47 JC	275	info->extclk_freq << 6);
a71b797f HZ	276	}
	277
	278	if (pdata->ramp_timing) {
	279	info->ramp_timing = pdata->ramp_timing;
c5b68d47 JC	280	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
c5b68d47 JC	281	info->ramp_timing << 5);
a71b797f HZ	282	}
	283
	284	info->ramp_down = pdata->ramp_down;
	285	if (info->ramp_down) {
c5b68d47 JC	286	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
c5b68d47 JC	287	MAX8649_RAMP_DOWN);
a71b797f HZ	288	}
a71b797f HZ	289
c172708d MB	290	config.dev = &client->dev;
	291	config.init_data = pdata->regulator;
	292	config.driver_data = info;
	293
	294	info->regulator = regulator_register(&dcdc_desc, &config);
a71b797f HZ	295	if (IS_ERR(info->regulator)) {
	296	dev_err(info->dev, "failed to register regulator %s\n",
	297	dcdc_desc.name);
dc553a79	298	return PTR_ERR(info->regulator);
a71b797f HZ	299	}
a71b797f HZ	300
a71b797f	301	return 0;
a71b797f HZ	302	}
	303
	304	static int __devexit max8649_regulator_remove(struct i2c_client *client)
	305	{
	306	struct max8649_regulator_info *info = i2c_get_clientdata(client);
	307
	308	if (info) {
	309	if (info->regulator)
	310	regulator_unregister(info->regulator);
a71b797f	311	}
a71b797f HZ	312
	313	return 0;
	314	}
	315
	316	static const struct i2c_device_id max8649_id[] = {
	317	{ "max8649", 0 },
	318	{ }
	319	};
	320	MODULE_DEVICE_TABLE(i2c, max8649_id);
	321
	322	static struct i2c_driver max8649_driver = {
	323	.probe = max8649_regulator_probe,
	324	.remove = __devexit_p(max8649_regulator_remove),
	325	.driver = {
	326	.name = "max8649",
	327	},
	328	.id_table = max8649_id,
	329	};
	330
	331	static int __init max8649_init(void)
	332	{
	333	return i2c_add_driver(&max8649_driver);
	334	}
	335	subsys_initcall(max8649_init);
	336
	337	static void __exit max8649_exit(void)
	338	{
	339	i2c_del_driver(&max8649_driver);
	340	}
	341	module_exit(max8649_exit);
	342
	343	/* Module information */
	344	MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
	345	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	346	MODULE_LICENSE("GPL");