[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;
};

/* 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 = regulator_list_voltage_linear(rdev, (unsigned char)val);

	/* 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_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage	= regulator_list_voltage_linear,
	.map_voltage	= regulator_map_voltage_linear,
	.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,
	.min_uV		= MAX8649_DCDC_VMIN,
	.uV_step	= MAX8649_DCDC_STEP,
};

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

static int 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;
	config.regmap = info->regmap;

	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 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		= 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
a71b797f HZ	63	/* EN_PD means pulldown on EN input */
	64	static int max8649_enable(struct regulator_dev *rdev)
	65	{
	66	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	67	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD, 0);
a71b797f HZ	68	}
	69
	70	/*
	71	* Applied internal pulldown resistor on EN input pin.
	72	* If pulldown EN pin outside, it would be better.
	73	*/
	74	static int max8649_disable(struct regulator_dev *rdev)
	75	{
	76	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	77	return regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_EN_PD,
a71b797f HZ	78	MAX8649_EN_PD);
	79	}
	80
	81	static int max8649_is_enabled(struct regulator_dev *rdev)
	82	{
	83	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	84	unsigned int val;
a71b797f HZ	85	int ret;
a71b797f HZ	86
c5b68d47 JC	87	ret = regmap_read(info->regmap, MAX8649_CONTROL, &val);
c5b68d47 JC	88	if (ret != 0)
a71b797f	89	return ret;
c5b68d47	90	return !((unsigned char)val & MAX8649_EN_PD);
a71b797f HZ	91	}
	92
	93	static int max8649_enable_time(struct regulator_dev *rdev)
	94	{
	95	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	96	int voltage, rate, ret;
c5b68d47	97	unsigned int val;
a71b797f HZ	98
a71b797f HZ	99	/* get voltage */
817d8c2d	100	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
c5b68d47	101	if (ret != 0)
a71b797f	102	return ret;
c5b68d47	103	val &= MAX8649_VOL_MASK;
0fb737b5	104	voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
a71b797f HZ	105
a71b797f HZ	106	/* get rate */
c5b68d47 JC	107	ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
c5b68d47 JC	108	if (ret != 0)
a71b797f	109	return ret;
c5b68d47	110	ret = (val & MAX8649_RAMP_MASK) >> 5;
a71b797f HZ	111	rate = (32 * 1000) >> ret; /* uV/uS */
a71b797f HZ	112
e69c4997	113	return DIV_ROUND_UP(voltage, rate);
a71b797f HZ	114	}
	115
	116	static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
	117	{
	118	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
	119
	120	switch (mode) {
	121	case REGULATOR_MODE_FAST:
817d8c2d AL	122	regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
817d8c2d AL	123	MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
a71b797f HZ	124	break;
a71b797f HZ	125	case REGULATOR_MODE_NORMAL:
817d8c2d	126	regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
c5b68d47	127	MAX8649_FORCE_PWM, 0);
a71b797f HZ	128	break;
	129	default:
	130	return -EINVAL;
	131	}
	132	return 0;
	133	}
	134
	135	static unsigned int max8649_get_mode(struct regulator_dev *rdev)
	136	{
	137	struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
c5b68d47	138	unsigned int val;
a71b797f HZ	139	int ret;
a71b797f HZ	140
817d8c2d	141	ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
c5b68d47 JC	142	if (ret != 0)
	143	return ret;
	144	if (val & MAX8649_FORCE_PWM)
a71b797f HZ	145	return REGULATOR_MODE_FAST;
	146	return REGULATOR_MODE_NORMAL;
	147	}
	148
	149	static struct regulator_ops max8649_dcdc_ops = {
40baecee	150	.set_voltage_sel = regulator_set_voltage_sel_regmap,
817d8c2d	151	.get_voltage_sel = regulator_get_voltage_sel_regmap,
0fb737b5	152	.list_voltage = regulator_list_voltage_linear,
40baecee	153	.map_voltage = regulator_map_voltage_linear,
a71b797f HZ	154	.enable = max8649_enable,
	155	.disable = max8649_disable,
	156	.is_enabled = max8649_is_enabled,
	157	.enable_time = max8649_enable_time,
	158	.set_mode = max8649_set_mode,
	159	.get_mode = max8649_get_mode,
	160
	161	};
	162
817d8c2d	163	static struct regulator_desc dcdc_desc = {
a71b797f HZ	164	.name = "max8649",
	165	.ops = &max8649_dcdc_ops,
	166	.type = REGULATOR_VOLTAGE,
	167	.n_voltages = 1 << 6,
	168	.owner = THIS_MODULE,
817d8c2d	169	.vsel_mask = MAX8649_VOL_MASK,
0fb737b5 AL	170	.min_uV = MAX8649_DCDC_VMIN,
0fb737b5 AL	171	.uV_step = MAX8649_DCDC_STEP,
a71b797f HZ	172	};
a71b797f HZ	173
c5b68d47 JC	174	static struct regmap_config max8649_regmap_config = {
	175	.reg_bits = 8,
	176	.val_bits = 8,
	177	};
	178
a5023574	179	static int max8649_regulator_probe(struct i2c_client *client,
a71b797f HZ	180	const struct i2c_device_id *id)
	181	{
	182	struct max8649_platform_data *pdata = client->dev.platform_data;
	183	struct max8649_regulator_info *info = NULL;
c172708d	184	struct regulator_config config = { };
c5b68d47	185	unsigned int val;
a71b797f HZ	186	unsigned char data;
	187	int ret;
	188
dc553a79 AL	189	info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
dc553a79 AL	190	GFP_KERNEL);
a71b797f HZ	191	if (!info) {
	192	dev_err(&client->dev, "No enough memory\n");
	193	return -ENOMEM;
	194	}
	195
dc553a79	196	info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
c5b68d47 JC	197	if (IS_ERR(info->regmap)) {
	198	ret = PTR_ERR(info->regmap);
	199	dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
dc553a79	200	return ret;
c5b68d47 JC	201	}
c5b68d47 JC	202
a71b797f	203	info->dev = &client->dev;
a71b797f HZ	204	i2c_set_clientdata(client, info);
	205
	206	info->mode = pdata->mode;
	207	switch (info->mode) {
	208	case 0:
817d8c2d	209	dcdc_desc.vsel_reg = MAX8649_MODE0;
a71b797f HZ	210	break;
a71b797f HZ	211	case 1:
817d8c2d	212	dcdc_desc.vsel_reg = MAX8649_MODE1;
a71b797f HZ	213	break;
a71b797f HZ	214	case 2:
817d8c2d	215	dcdc_desc.vsel_reg = MAX8649_MODE2;
a71b797f HZ	216	break;
a71b797f HZ	217	case 3:
817d8c2d	218	dcdc_desc.vsel_reg = MAX8649_MODE3;
a71b797f HZ	219	break;
	220	default:
	221	break;
	222	}
	223
c5b68d47 JC	224	ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
c5b68d47 JC	225	if (ret != 0) {
a71b797f HZ	226	dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
a71b797f HZ	227	ret);
dc553a79	228	return ret;
a71b797f	229	}
da7de6a1	230	dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
a71b797f HZ	231
a71b797f HZ	232	/* enable VID0 & VID1 */
c5b68d47	233	regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
a71b797f HZ	234
	235	/* enable/disable external clock synchronization */
	236	info->extclk = pdata->extclk;
	237	data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
817d8c2d AL	238	regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
817d8c2d AL	239	MAX8649_SYNC_EXTCLK, data);
a71b797f HZ	240	if (info->extclk) {
	241	/* set external clock frequency */
	242	info->extclk_freq = pdata->extclk_freq;
c5b68d47 JC	243	regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
c5b68d47 JC	244	info->extclk_freq << 6);
a71b797f HZ	245	}
	246
	247	if (pdata->ramp_timing) {
	248	info->ramp_timing = pdata->ramp_timing;
c5b68d47 JC	249	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
c5b68d47 JC	250	info->ramp_timing << 5);
a71b797f HZ	251	}
	252
	253	info->ramp_down = pdata->ramp_down;
	254	if (info->ramp_down) {
c5b68d47 JC	255	regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
c5b68d47 JC	256	MAX8649_RAMP_DOWN);
a71b797f HZ	257	}
a71b797f HZ	258
c172708d MB	259	config.dev = &client->dev;
	260	config.init_data = pdata->regulator;
	261	config.driver_data = info;
61663171	262	config.regmap = info->regmap;
c172708d MB	263
c172708d MB	264	info->regulator = regulator_register(&dcdc_desc, &config);
a71b797f HZ	265	if (IS_ERR(info->regulator)) {
	266	dev_err(info->dev, "failed to register regulator %s\n",
	267	dcdc_desc.name);
dc553a79	268	return PTR_ERR(info->regulator);
a71b797f HZ	269	}
a71b797f HZ	270
a71b797f	271	return 0;
a71b797f HZ	272	}
a71b797f HZ	273
8dc995f5	274	static int max8649_regulator_remove(struct i2c_client *client)
a71b797f HZ	275	{
	276	struct max8649_regulator_info *info = i2c_get_clientdata(client);
	277
	278	if (info) {
	279	if (info->regulator)
	280	regulator_unregister(info->regulator);
a71b797f	281	}
a71b797f HZ	282
	283	return 0;
	284	}
	285
	286	static const struct i2c_device_id max8649_id[] = {
	287	{ "max8649", 0 },
	288	{ }
	289	};
	290	MODULE_DEVICE_TABLE(i2c, max8649_id);
	291
	292	static struct i2c_driver max8649_driver = {
	293	.probe = max8649_regulator_probe,
5eb9f2b9	294	.remove = max8649_regulator_remove,
a71b797f HZ	295	.driver = {
	296	.name = "max8649",
	297	},
	298	.id_table = max8649_id,
	299	};
	300
	301	static int __init max8649_init(void)
	302	{
	303	return i2c_add_driver(&max8649_driver);
	304	}
	305	subsys_initcall(max8649_init);
	306
	307	static void __exit max8649_exit(void)
	308	{
	309	i2c_del_driver(&max8649_driver);
	310	}
	311	module_exit(max8649_exit);
	312
	313	/* Module information */
	314	MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
	315	MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
	316	MODULE_LICENSE("GPL");