[GitHub/mt8127/android_kernel_alcatel_ttab.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;

	int		vol_reg;
	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_get_voltage(struct regulator_dev *rdev)
{
	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	unsigned int val;
	unsigned char data;
	int ret;

	ret = regmap_read(info->regmap, info->vol_reg, &val);
	if (ret != 0)
		return ret;
	data = (unsigned char)val & MAX8649_VOL_MASK;
	return max8649_list_voltage(rdev, data);
}

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 = (min_uV - MAX8649_DCDC_VMIN + MAX8649_DCDC_STEP - 1)
		/ MAX8649_DCDC_STEP;
	mask = MAX8649_VOL_MASK;
	*selector = data & mask;

	return regmap_update_bits(info->regmap, info->vol_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, info->vol_reg, &val);
	if (ret != 0)
		return ret;
	val &= MAX8649_VOL_MASK;
	voltage = max8649_list_voltage(rdev, (unsigned char)ret); /* 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, info->vol_reg, MAX8649_FORCE_PWM,
				   MAX8649_FORCE_PWM);
		break;
	case REGULATOR_MODE_NORMAL:
		regmap_update_bits(info->regmap, info->vol_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, info->vol_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	= max8649_get_voltage,
	.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,
};

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;
	unsigned int val;
	unsigned char data;
	int ret;

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

	info->regmap = 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);
		goto fail;
	}

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

	info->mode = pdata->mode;
	switch (info->mode) {
	case 0:
		info->vol_reg = MAX8649_MODE0;
		break;
	case 1:
		info->vol_reg = MAX8649_MODE1;
		break;
	case 2:
		info->vol_reg = MAX8649_MODE2;
		break;
	case 3:
		info->vol_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);
		goto out;
	}
	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret);

	/* 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, info->vol_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);
	}

	info->regulator = regulator_register(&dcdc_desc, &client->dev,
					     pdata->regulator, info, NULL);
	if (IS_ERR(info->regulator)) {
		dev_err(info->dev, "failed to register regulator %s\n",
			dcdc_desc.name);
		ret = PTR_ERR(info->regulator);
		goto out;
	}

	dev_info(info->dev, "Max8649 regulator device is detected.\n");
	return 0;
out:
	regmap_exit(info->regmap);
fail:
	kfree(info);
	return ret;
}

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);
		regmap_exit(info->regmap);
		kfree(info);
	}

	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 HZ	55
	56	int vol_reg;
	57	unsigned mode:2; /* bit[1:0] = VID1, VID0 */
	58	unsigned extclk_freq:2;
	59	unsigned extclk:1;
	60	unsigned ramp_timing:3;
	61	unsigned ramp_down:1;
	62	};
	63
	64	/* I2C operations */
	65
a71b797f HZ	66	static inline int check_range(int min_uV, int max_uV)
	67	{
	68	if ((min_uV < MAX8649_DCDC_VMIN) \|\| (max_uV > MAX8649_DCDC_VMAX)
	69	\|\| (min_uV > max_uV))
	70	return -EINVAL;
	71	return 0;
	72	}
	73
	74	static int max8649_list_voltage(struct regulator_dev *rdev, unsigned index)
	75	{
	76	return (MAX8649_DCDC_VMIN + index * MAX8649_DCDC_STEP);
	77	}
	78
	79	static int max8649_get_voltage(struct regulator_dev *rdev)
	80	{
	81	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	82	unsigned int val;
a71b797f HZ	83	unsigned char data;
	84	int ret;
	85
c5b68d47 JC	86	ret = regmap_read(info->regmap, info->vol_reg, &val);
c5b68d47 JC	87	if (ret != 0)
a71b797f	88	return ret;
c5b68d47	89	data = (unsigned char)val & MAX8649_VOL_MASK;
a71b797f HZ	90	return max8649_list_voltage(rdev, data);
	91	}
	92
	93	static int max8649_set_voltage(struct regulator_dev *rdev,
3a93f2a9	94	int min_uV, int max_uV, unsigned *selector)
a71b797f HZ	95	{
	96	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	97	unsigned char data, mask;
	98
	99	if (check_range(min_uV, max_uV)) {
	100	dev_err(info->dev, "invalid voltage range (%d, %d) uV\n",
	101	min_uV, max_uV);
	102	return -EINVAL;
	103	}
	104	data = (min_uV - MAX8649_DCDC_VMIN + MAX8649_DCDC_STEP - 1)
	105	/ MAX8649_DCDC_STEP;
	106	mask = MAX8649_VOL_MASK;
3a93f2a9	107	*selector = data & mask;
a71b797f	108
c5b68d47	109	return regmap_update_bits(info->regmap, info->vol_reg, mask, data);
a71b797f HZ	110	}
	111
	112	/* EN_PD means pulldown on EN input */
	113	static int max8649_enable(struct regulator_dev *rdev)
	114	{
	115	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	116	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
a71b797f HZ	117	}
	118
	119	/*
	120	* Applied internal pulldown resistor on EN input pin.
	121	* If pulldown EN pin outside, it would be better.
	122	*/
	123	static int max8649_disable(struct regulator_dev *rdev)
	124	{
	125	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	126	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
a71b797f HZ	127	MAX8649_EN_PD);
	128	}
	129
	130	static int max8649_is_enabled(struct regulator_dev *rdev)
	131	{
	132	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	133	unsigned int val;
a71b797f HZ	134	int ret;
a71b797f HZ	135
c5b68d47 JC	136	ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
c5b68d47 JC	137	if (ret != 0)
a71b797f	138	return ret;
c5b68d47	139	return !((unsigned char)val & MAX8649_EN_PD);
a71b797f HZ	140	}
	141
	142	static int max8649_enable_time(struct regulator_dev *rdev)
	143	{
	144	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	145	int voltage, rate, ret;
c5b68d47	146	unsigned int val;
a71b797f HZ	147
a71b797f HZ	148	/* get voltage */
c5b68d47 JC	149	ret = regmap_read(info->regmap, info->vol_reg, &val);
c5b68d47 JC	150	if (ret != 0)
a71b797f	151	return ret;
c5b68d47	152	val &= MAX8649_VOL_MASK;
a71b797f HZ	153	voltage = max8649_list_voltage(rdev, (unsigned char)ret); /* uV */
	154
	155	/* get rate */
c5b68d47 JC	156	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
c5b68d47 JC	157	if (ret != 0)
a71b797f	158	return ret;
c5b68d47	159	ret = (val & MAX8649_RAMP_MASK) >> 5;
a71b797f HZ	160	rate = (32 * 1000) >> ret; /* uV/uS */
a71b797f HZ	161
e69c4997	162	return DIV_ROUND_UP(voltage, rate);
a71b797f HZ	163	}
	164
	165	static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
	166	{
	167	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	168
	169	switch (mode) {
	170	case REGULATOR_MODE_FAST:
c5b68d47 JC	171	regmap_update_bits(info->regmap, info->vol_reg, MAX8649_FORCE_PWM,
c5b68d47 JC	172	MAX8649_FORCE_PWM);
a71b797f HZ	173	break;
a71b797f HZ	174	case REGULATOR_MODE_NORMAL:
c5b68d47 JC	175	regmap_update_bits(info->regmap, info->vol_reg,
c5b68d47 JC	176	MAX8649_FORCE_PWM, 0);
a71b797f HZ	177	break;
	178	default:
	179	return -EINVAL;
	180	}
	181	return 0;
	182	}
	183
	184	static unsigned int max8649_get_mode(struct regulator_dev *rdev)
	185	{
	186	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	187	unsigned int val;
a71b797f HZ	188	int ret;
a71b797f HZ	189
c5b68d47 JC	190	ret = regmap_read(info->regmap, info->vol_reg, &val);
	191	if (ret != 0)
	192	return ret;
	193	if (val & MAX8649_FORCE_PWM)
a71b797f HZ	194	return REGULATOR_MODE_FAST;
	195	return REGULATOR_MODE_NORMAL;
	196	}
	197
	198	static struct regulator_ops max8649_dcdc_ops = {
	199	.set_voltage = max8649_set_voltage,
	200	.get_voltage = max8649_get_voltage,
	201	.list_voltage = max8649_list_voltage,
	202	.enable = max8649_enable,
	203	.disable = max8649_disable,
	204	.is_enabled = max8649_is_enabled,
	205	.enable_time = max8649_enable_time,
	206	.set_mode = max8649_set_mode,
	207	.get_mode = max8649_get_mode,
	208
	209	};
	210
	211	static struct regulator_desc dcdc_desc = {
	212	.name = "max8649",
	213	.ops = &max8649_dcdc_ops,
	214	.type = REGULATOR_VOLTAGE,
	215	.n_voltages = 1 << 6,
	216	.owner = THIS_MODULE,
	217	};
	218
c5b68d47 JC	219	static struct regmap_config max8649_regmap_config = {
	220	.reg_bits = 8,
	221	.val_bits = 8,
	222	};
	223
a71b797f HZ	224	static int __devinit max8649_regulator_probe(struct i2c_client *client,
	225	const struct i2c_device_id *id)
	226	{
	227	struct max8649_platform_data *pdata = client->dev.platform_data;
	228	struct max8649_regulator_info *info = NULL;
c5b68d47	229	unsigned int val;
a71b797f HZ	230	unsigned char data;
	231	int ret;
	232
	233	info = kzalloc(sizeof(struct max8649_regulator_info), GFP_KERNEL);
	234	if (!info) {
	235	dev_err(&client->dev, "No enough memory\n");
	236	return -ENOMEM;
	237	}
	238
c5b68d47 JC	239	info->regmap = regmap_init_i2c(client, &max8649_regmap_config);
	240	if (IS_ERR(info->regmap)) {
	241	ret = PTR_ERR(info->regmap);
	242	dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
	243	goto fail;
	244	}
	245
a71b797f	246	info->dev = &client->dev;
a71b797f HZ	247	i2c_set_clientdata(client, info);
	248
	249	info->mode = pdata->mode;
	250	switch (info->mode) {
	251	case 0:
	252	info->vol_reg = MAX8649_MODE0;
	253	break;
	254	case 1:
	255	info->vol_reg = MAX8649_MODE1;
	256	break;
	257	case 2:
	258	info->vol_reg = MAX8649_MODE2;
	259	break;
	260	case 3:
	261	info->vol_reg = MAX8649_MODE3;
	262	break;
	263	default:
	264	break;
	265	}
	266
c5b68d47 JC	267	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
c5b68d47 JC	268	if (ret != 0) {
a71b797f HZ	269	dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
	270	ret);
	271	goto out;
	272	}
	273	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", ret);
	274
	275	/* enable VID0 & VID1 */
c5b68d47	276	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
a71b797f HZ	277
	278	/* enable/disable external clock synchronization */
	279	info->extclk = pdata->extclk;
	280	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
c5b68d47	281	regmap_update_bits(info->regmap, info->vol_reg, MAX8649_SYNC_EXTCLK, data);
a71b797f HZ	282	if (info->extclk) {
	283	/* set external clock frequency */
	284	info->extclk_freq = pdata->extclk_freq;
c5b68d47 JC	285	regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
c5b68d47 JC	286	info->extclk_freq << 6);
a71b797f HZ	287	}
	288
	289	if (pdata->ramp_timing) {
	290	info->ramp_timing = pdata->ramp_timing;
c5b68d47 JC	291	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
c5b68d47 JC	292	info->ramp_timing << 5);
a71b797f HZ	293	}
	294
	295	info->ramp_down = pdata->ramp_down;
	296	if (info->ramp_down) {
c5b68d47 JC	297	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
c5b68d47 JC	298	MAX8649_RAMP_DOWN);
a71b797f HZ	299	}
	300
	301	info->regulator = regulator_register(&dcdc_desc, &client->dev,
2c043bcb	302	pdata->regulator, info, NULL);
a71b797f HZ	303	if (IS_ERR(info->regulator)) {
	304	dev_err(info->dev, "failed to register regulator %s\n",
	305	dcdc_desc.name);
	306	ret = PTR_ERR(info->regulator);
	307	goto out;
	308	}
	309
	310	dev_info(info->dev, "Max8649 regulator device is detected.\n");
	311	return 0;
	312	out:
c5b68d47 JC	313	regmap_exit(info->regmap);
c5b68d47 JC	314	fail:
a71b797f HZ	315	kfree(info);
	316	return ret;
	317	}
	318
	319	static int __devexit max8649_regulator_remove(struct i2c_client *client)
	320	{
	321	struct max8649_regulator_info *info = i2c_get_clientdata(client);
	322
	323	if (info) {
	324	if (info->regulator)
	325	regulator_unregister(info->regulator);
c5b68d47	326	regmap_exit(info->regmap);
a71b797f HZ	327	kfree(info);
a71b797f HZ	328	}
a71b797f HZ	329
	330	return 0;
	331	}
	332
	333	static const struct i2c_device_id max8649_id[] = {
	334	{ "max8649", 0 },
	335	{ }
	336	};
	337	MODULE_DEVICE_TABLE(i2c, max8649_id);
	338
	339	static struct i2c_driver max8649_driver = {
	340	.probe = max8649_regulator_probe,
	341	.remove = __devexit_p(max8649_regulator_remove),
	342	.driver = {
	343	.name = "max8649",
	344	},
	345	.id_table = max8649_id,
	346	};
	347
	348	static int __init max8649_init(void)
	349	{
	350	return i2c_add_driver(&max8649_driver);
	351	}
	352	subsys_initcall(max8649_init);
	353
	354	static void __exit max8649_exit(void)
	355	{
	356	i2c_del_driver(&max8649_driver);
	357	}
	358	module_exit(max8649_exit);
	359
	360	/* Module information */
	361	MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
	362	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	363	MODULE_LICENSE("GPL");
	364