[linux-2.6-block.git] / drivers / regulator / max8952.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * max8952.c - Voltage and current regulation for the Maxim 8952
 *
 * Copyright (C) 2010 Samsung Electronics
 * MyungJoo Ham <myungjoo.ham@samsung.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/max8952.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>

/* Registers */
enum {
	MAX8952_REG_MODE0,
	MAX8952_REG_MODE1,
	MAX8952_REG_MODE2,
	MAX8952_REG_MODE3,
	MAX8952_REG_CONTROL,
	MAX8952_REG_SYNC,
	MAX8952_REG_RAMP,
	MAX8952_REG_CHIP_ID1,
	MAX8952_REG_CHIP_ID2,
};

struct max8952_data {
	struct i2c_client	*client;
	struct max8952_platform_data *pdata;
	struct gpio_desc *vid0_gpiod;
	struct gpio_desc *vid1_gpiod;
	bool vid0;
	bool vid1;
};

static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
{
	int ret = i2c_smbus_read_byte_data(max8952->client, reg);

	if (ret > 0)
		ret &= 0xff;

	return ret;
}

static int max8952_write_reg(struct max8952_data *max8952,
		u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(max8952->client, reg, value);
}

static int max8952_list_voltage(struct regulator_dev *rdev,
		unsigned int selector)
{
	struct max8952_data *max8952 = rdev_get_drvdata(rdev);

	if (rdev_get_id(rdev) != 0)
		return -EINVAL;

	return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000;
}

static int max8952_get_voltage_sel(struct regulator_dev *rdev)
{
	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
	u8 vid = 0;

	if (max8952->vid0)
		vid += 1;
	if (max8952->vid1)
		vid += 2;

	return vid;
}

static int max8952_set_voltage_sel(struct regulator_dev *rdev,
				   unsigned selector)
{
	struct max8952_data *max8952 = rdev_get_drvdata(rdev);

	if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) {
		/* DVS not supported */
		return -EPERM;
	}

	max8952->vid0 = selector & 0x1;
	max8952->vid1 = (selector >> 1) & 0x1;
	gpiod_set_value(max8952->vid0_gpiod, max8952->vid0);
	gpiod_set_value(max8952->vid1_gpiod, max8952->vid1);

	return 0;
}

static const struct regulator_ops max8952_ops = {
	.list_voltage		= max8952_list_voltage,
	.get_voltage_sel	= max8952_get_voltage_sel,
	.set_voltage_sel	= max8952_set_voltage_sel,
};

static const struct regulator_desc regulator = {
	.name		= "MAX8952_VOUT",
	.id		= 0,
	.n_voltages	= MAX8952_NUM_DVS_MODE,
	.ops		= &max8952_ops,
	.type		= REGULATOR_VOLTAGE,
	.owner		= THIS_MODULE,
};

#ifdef CONFIG_OF
static const struct of_device_id max8952_dt_match[] = {
	{ .compatible = "maxim,max8952" },
	{},
};
MODULE_DEVICE_TABLE(of, max8952_dt_match);

static struct max8952_platform_data *max8952_parse_dt(struct device *dev)
{
	struct max8952_platform_data *pd;
	struct device_node *np = dev->of_node;
	int ret;
	int i;

	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
	if (!pd)
		return NULL;

	if (of_property_read_u32(np, "max8952,default-mode", &pd->default_mode))
		dev_warn(dev, "Default mode not specified, assuming 0\n");

	ret = of_property_read_u32_array(np, "max8952,dvs-mode-microvolt",
					pd->dvs_mode, ARRAY_SIZE(pd->dvs_mode));
	if (ret) {
		dev_err(dev, "max8952,dvs-mode-microvolt property not specified");
		return NULL;
	}

	for (i = 0; i < ARRAY_SIZE(pd->dvs_mode); ++i) {
		if (pd->dvs_mode[i] < 770000 || pd->dvs_mode[i] > 1400000) {
			dev_err(dev, "DVS voltage %d out of range\n", i);
			return NULL;
		}
		pd->dvs_mode[i] = (pd->dvs_mode[i] - 770000) / 10000;
	}

	if (of_property_read_u32(np, "max8952,sync-freq", &pd->sync_freq))
		dev_warn(dev, "max8952,sync-freq property not specified, defaulting to 26MHz\n");

	if (of_property_read_u32(np, "max8952,ramp-speed", &pd->ramp_speed))
		dev_warn(dev, "max8952,ramp-speed property not specified, defaulting to 32mV/us\n");

	pd->reg_data = of_get_regulator_init_data(dev, np, &regulator);
	if (!pd->reg_data) {
		dev_err(dev, "Failed to parse regulator init data\n");
		return NULL;
	}

	return pd;
}
#else
static struct max8952_platform_data *max8952_parse_dt(struct device *dev)
{
	return NULL;
}
#endif

static int max8952_pmic_probe(struct i2c_client *client,
		const struct i2c_device_id *i2c_id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct max8952_platform_data *pdata = dev_get_platdata(&client->dev);
	struct regulator_config config = { };
	struct max8952_data *max8952;
	struct regulator_dev *rdev;
	struct gpio_desc *gpiod;
	enum gpiod_flags gflags;

	int ret = 0;

	if (client->dev.of_node)
		pdata = max8952_parse_dt(&client->dev);

	if (!pdata) {
		dev_err(&client->dev, "Require the platform data\n");
		return -EINVAL;
	}

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
		return -EIO;

	max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data),
			       GFP_KERNEL);
	if (!max8952)
		return -ENOMEM;

	max8952->client = client;
	max8952->pdata = pdata;

	config.dev = &client->dev;
	config.init_data = pdata->reg_data;
	config.driver_data = max8952;
	config.of_node = client->dev.of_node;

	if (pdata->reg_data->constraints.boot_on)
		gflags = GPIOD_OUT_HIGH;
	else
		gflags = GPIOD_OUT_LOW;
	gflags |= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
	/*
	 * Do not use devm* here: the regulator core takes over the
	 * lifecycle management of the GPIO descriptor.
	 */
	gpiod = gpiod_get_optional(&client->dev,
				   "max8952,en",
				   gflags);
	if (IS_ERR(gpiod))
		return PTR_ERR(gpiod);
	if (gpiod)
		config.ena_gpiod = gpiod;

	rdev = devm_regulator_register(&client->dev, &regulator, &config);
	if (IS_ERR(rdev)) {
		ret = PTR_ERR(rdev);
		dev_err(&client->dev, "regulator init failed (%d)\n", ret);
		return ret;
	}

	max8952->vid0 = pdata->default_mode & 0x1;
	max8952->vid1 = (pdata->default_mode >> 1) & 0x1;

	/* Fetch vid0 and vid1 GPIOs if available */
	gflags = max8952->vid0 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	max8952->vid0_gpiod = devm_gpiod_get_index_optional(&client->dev,
							    "max8952,vid",
							    0, gflags);
	if (IS_ERR(max8952->vid0_gpiod))
		return PTR_ERR(max8952->vid0_gpiod);
	gflags = max8952->vid1 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	max8952->vid1_gpiod = devm_gpiod_get_index_optional(&client->dev,
							    "max8952,vid",
							    1, gflags);
	if (IS_ERR(max8952->vid1_gpiod))
		return PTR_ERR(max8952->vid1_gpiod);

	/* If either VID GPIO is missing just disable this */
	if (!max8952->vid0_gpiod || !max8952->vid1_gpiod) {
		dev_warn(&client->dev, "VID0/1 gpio invalid: "
			 "DVS not available.\n");
		max8952->vid0 = 0;
		max8952->vid1 = 0;
		/* Make sure if we have any descriptors they get set to low */
		if (max8952->vid0_gpiod)
			gpiod_set_value(max8952->vid0_gpiod, 0);
		if (max8952->vid1_gpiod)
			gpiod_set_value(max8952->vid1_gpiod, 0);

		/* Disable Pulldown of EN only */
		max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60);

		dev_err(&client->dev, "DVS modes disabled because VID0 and VID1"
				" do not have proper controls.\n");
	} else {
		/*
		 * Disable Pulldown on EN, VID0, VID1 to reduce
		 * leakage current of MAX8952 assuming that MAX8952
		 * is turned on (EN==1). Note that without having VID0/1
		 * properly connected, turning pulldown off can be
		 * problematic. Thus, turn this off only when they are
		 * controllable by GPIO.
		 */
		max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0);
	}

	max8952_write_reg(max8952, MAX8952_REG_MODE0,
			(max8952_read_reg(max8952,
					  MAX8952_REG_MODE0) & 0xC0) |
			(pdata->dvs_mode[0] & 0x3F));
	max8952_write_reg(max8952, MAX8952_REG_MODE1,
			(max8952_read_reg(max8952,
					  MAX8952_REG_MODE1) & 0xC0) |
			(pdata->dvs_mode[1] & 0x3F));
	max8952_write_reg(max8952, MAX8952_REG_MODE2,
			(max8952_read_reg(max8952,
					  MAX8952_REG_MODE2) & 0xC0) |
			(pdata->dvs_mode[2] & 0x3F));
	max8952_write_reg(max8952, MAX8952_REG_MODE3,
			(max8952_read_reg(max8952,
					  MAX8952_REG_MODE3) & 0xC0) |
			(pdata->dvs_mode[3] & 0x3F));

	max8952_write_reg(max8952, MAX8952_REG_SYNC,
			(max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) |
			((pdata->sync_freq & 0x3) << 6));
	max8952_write_reg(max8952, MAX8952_REG_RAMP,
			(max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) |
			((pdata->ramp_speed & 0x7) << 5));

	i2c_set_clientdata(client, max8952);

	return 0;
}

static const struct i2c_device_id max8952_ids[] = {
	{ "max8952", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, max8952_ids);

static struct i2c_driver max8952_pmic_driver = {
	.probe		= max8952_pmic_probe,
	.driver		= {
		.name	= "max8952",
		.of_match_table = of_match_ptr(max8952_dt_match),
	},
	.id_table	= max8952_ids,
};

static int __init max8952_pmic_init(void)
{
	return i2c_add_driver(&max8952_pmic_driver);
}
subsys_initcall(max8952_pmic_init);

static void __exit max8952_pmic_exit(void)
{
	i2c_del_driver(&max8952_pmic_driver);
}
module_exit(max8952_pmic_exit);

MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_LICENSE("GPL");
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
202f4f53 MH	2	/*
	3	* max8952.c - Voltage and current regulation for the Maxim 8952
	4	*
	5	* Copyright (C) 2010 Samsung Electronics
	6	* MyungJoo Ham <myungjoo.ham@samsung.com>
202f4f53 MH	7	*/
	8
	9	#include <linux/module.h>
	10	#include <linux/init.h>
	11	#include <linux/i2c.h>
	12	#include <linux/err.h>
	13	#include <linux/platform_device.h>
	14	#include <linux/regulator/driver.h>
	15	#include <linux/regulator/max8952.h>
d7a261c2	16	#include <linux/gpio/consumer.h>
202f4f53	17	#include <linux/io.h>
3ff4aa95	18	#include <linux/of.h>
3ff4aa95	19	#include <linux/regulator/of_regulator.h>
202f4f53 MH	20	#include <linux/slab.h>
	21
	22	/* Registers */
	23	enum {
	24	MAX8952_REG_MODE0,
	25	MAX8952_REG_MODE1,
	26	MAX8952_REG_MODE2,
	27	MAX8952_REG_MODE3,
	28	MAX8952_REG_CONTROL,
	29	MAX8952_REG_SYNC,
	30	MAX8952_REG_RAMP,
	31	MAX8952_REG_CHIP_ID1,
	32	MAX8952_REG_CHIP_ID2,
	33	};
	34
	35	struct max8952_data {
	36	struct i2c_client *client;
202f4f53	37	struct max8952_platform_data *pdata;
fd742eaa LW	38	struct gpio_desc *vid0_gpiod;
fd742eaa LW	39	struct gpio_desc *vid1_gpiod;
202f4f53 MH	40	bool vid0;
202f4f53 MH	41	bool vid1;
202f4f53 MH	42	};
	43
	44	static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
	45	{
	46	int ret = i2c_smbus_read_byte_data(max8952->client, reg);
a5f8f963	47
202f4f53 MH	48	if (ret > 0)
	49	ret &= 0xff;
	50
	51	return ret;
	52	}
	53
	54	static int max8952_write_reg(struct max8952_data *max8952,
	55	u8 reg, u8 value)
	56	{
	57	return i2c_smbus_write_byte_data(max8952->client, reg, value);
	58	}
	59
202f4f53 MH	60	static int max8952_list_voltage(struct regulator_dev *rdev,
	61	unsigned int selector)
	62	{
	63	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
	64
	65	if (rdev_get_id(rdev) != 0)
	66	return -EINVAL;
	67
b9b49af5	68	return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000;
202f4f53 MH	69	}
202f4f53 MH	70
b9b49af5	71	static int max8952_get_voltage_sel(struct regulator_dev *rdev)
202f4f53 MH	72	{
	73	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
	74	u8 vid = 0;
	75
	76	if (max8952->vid0)
	77	vid += 1;
	78	if (max8952->vid1)
	79	vid += 2;
	80
b9b49af5	81	return vid;
202f4f53 MH	82	}
202f4f53 MH	83
6ea67d04 AL	84	static int max8952_set_voltage_sel(struct regulator_dev *rdev,
6ea67d04 AL	85	unsigned selector)
202f4f53 MH	86	{
202f4f53 MH	87	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
202f4f53	88
fd742eaa	89	if (!max8952->vid0_gpiod \|\| !max8952->vid1_gpiod) {
202f4f53 MH	90	/* DVS not supported */
	91	return -EPERM;
	92	}
	93
6ea67d04 AL	94	max8952->vid0 = selector & 0x1;
6ea67d04 AL	95	max8952->vid1 = (selector >> 1) & 0x1;
fd742eaa LW	96	gpiod_set_value(max8952->vid0_gpiod, max8952->vid0);
fd742eaa LW	97	gpiod_set_value(max8952->vid1_gpiod, max8952->vid1);
202f4f53 MH	98
	99	return 0;
	100	}
	101
6e09f4af	102	static const struct regulator_ops max8952_ops = {
202f4f53	103	.list_voltage = max8952_list_voltage,
b9b49af5	104	.get_voltage_sel = max8952_get_voltage_sel,
6ea67d04	105	.set_voltage_sel = max8952_set_voltage_sel,
202f4f53 MH	106	};
202f4f53 MH	107
bd6ff0d6	108	static const struct regulator_desc regulator = {
202f4f53 MH	109	.name = "MAX8952_VOUT",
	110	.id = 0,
	111	.n_voltages = MAX8952_NUM_DVS_MODE,
	112	.ops = &max8952_ops,
	113	.type = REGULATOR_VOLTAGE,
	114	.owner = THIS_MODULE,
	115	};
	116
3ff4aa95	117	#ifdef CONFIG_OF
cfe6e333	118	static const struct of_device_id max8952_dt_match[] = {
3ff4aa95 TF	119	{ .compatible = "maxim,max8952" },
	120	{},
	121	};
	122	MODULE_DEVICE_TABLE(of, max8952_dt_match);
	123
	124	static struct max8952_platform_data max8952_parse_dt(struct device dev)
	125	{
	126	struct max8952_platform_data *pd;
	127	struct device_node *np = dev->of_node;
	128	int ret;
	129	int i;
	130
	131	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
7752d964	132	if (!pd)
3ff4aa95	133	return NULL;
3ff4aa95	134
3ff4aa95 TF	135	if (of_property_read_u32(np, "max8952,default-mode", &pd->default_mode))
	136	dev_warn(dev, "Default mode not specified, assuming 0\n");
	137
	138	ret = of_property_read_u32_array(np, "max8952,dvs-mode-microvolt",
	139	pd->dvs_mode, ARRAY_SIZE(pd->dvs_mode));
	140	if (ret) {
	141	dev_err(dev, "max8952,dvs-mode-microvolt property not specified");
	142	return NULL;
	143	}
	144
	145	for (i = 0; i < ARRAY_SIZE(pd->dvs_mode); ++i) {
	146	if (pd->dvs_mode[i] < 770000 \|\| pd->dvs_mode[i] > 1400000) {
	147	dev_err(dev, "DVS voltage %d out of range\n", i);
	148	return NULL;
	149	}
	150	pd->dvs_mode[i] = (pd->dvs_mode[i] - 770000) / 10000;
	151	}
	152
	153	if (of_property_read_u32(np, "max8952,sync-freq", &pd->sync_freq))
	154	dev_warn(dev, "max8952,sync-freq property not specified, defaulting to 26MHz\n");
	155
	156	if (of_property_read_u32(np, "max8952,ramp-speed", &pd->ramp_speed))
	157	dev_warn(dev, "max8952,ramp-speed property not specified, defaulting to 32mV/us\n");
	158
072e78b1	159	pd->reg_data = of_get_regulator_init_data(dev, np, &regulator);
3ff4aa95 TF	160	if (!pd->reg_data) {
	161	dev_err(dev, "Failed to parse regulator init data\n");
	162	return NULL;
	163	}
	164
	165	return pd;
	166	}
	167	#else
	168	static struct max8952_platform_data max8952_parse_dt(struct device dev)
	169	{
	170	return NULL;
	171	}
	172	#endif
	173
a5023574	174	static int max8952_pmic_probe(struct i2c_client *client,
202f4f53 MH	175	const struct i2c_device_id *i2c_id)
202f4f53 MH	176	{
6b96092a	177	struct i2c_adapter *adapter = client->adapter;
dff91d0b	178	struct max8952_platform_data *pdata = dev_get_platdata(&client->dev);
c172708d	179	struct regulator_config config = { };
202f4f53	180	struct max8952_data *max8952;
b874f41c	181	struct regulator_dev *rdev;
d7a261c2 LW	182	struct gpio_desc *gpiod;
d7a261c2 LW	183	enum gpiod_flags gflags;
202f4f53	184
fd742eaa	185	int ret = 0;
202f4f53	186
3ff4aa95 TF	187	if (client->dev.of_node)
	188	pdata = max8952_parse_dt(&client->dev);
	189
202f4f53 MH	190	if (!pdata) {
	191	dev_err(&client->dev, "Require the platform data\n");
	192	return -EINVAL;
	193	}
	194
	195	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
	196	return -EIO;
	197
372de4aa AL	198	max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data),
372de4aa AL	199	GFP_KERNEL);
202f4f53 MH	200	if (!max8952)
	201	return -ENOMEM;
	202
	203	max8952->client = client;
202f4f53	204	max8952->pdata = pdata;
202f4f53	205
b874f41c	206	config.dev = &client->dev;
3ec6eb9c	207	config.init_data = pdata->reg_data;
c172708d	208	config.driver_data = max8952;
71622e15	209	config.of_node = client->dev.of_node;
c172708d	210
3ec6eb9c	211	if (pdata->reg_data->constraints.boot_on)
d7a261c2 LW	212	gflags = GPIOD_OUT_HIGH;
	213	else
	214	gflags = GPIOD_OUT_LOW;
63239e4b	215	gflags \|= GPIOD_FLAGS_BIT_NONEXCLUSIVE;
894077d5 LW	216	/*
	217	* Do not use devm* here: the regulator core takes over the
	218	* lifecycle management of the GPIO descriptor.
	219	*/
	220	gpiod = gpiod_get_optional(&client->dev,
	221	"max8952,en",
	222	gflags);
d7a261c2 LW	223	if (IS_ERR(gpiod))
	224	return PTR_ERR(gpiod);
	225	if (gpiod)
	226	config.ena_gpiod = gpiod;
b669e0ad	227
b874f41c	228	rdev = devm_regulator_register(&client->dev, &regulator, &config);
b874f41c KK	229	if (IS_ERR(rdev)) {
	230	ret = PTR_ERR(rdev);
	231	dev_err(&client->dev, "regulator init failed (%d)\n", ret);
372de4aa	232	return ret;
da05738e	233	}
202f4f53	234
c8237f01 AL	235	max8952->vid0 = pdata->default_mode & 0x1;
c8237f01 AL	236	max8952->vid1 = (pdata->default_mode >> 1) & 0x1;
202f4f53	237
fd742eaa LW	238	/* Fetch vid0 and vid1 GPIOs if available */
	239	gflags = max8952->vid0 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	240	max8952->vid0_gpiod = devm_gpiod_get_index_optional(&client->dev,
	241	"max8952,vid",
	242	0, gflags);
	243	if (IS_ERR(max8952->vid0_gpiod))
	244	return PTR_ERR(max8952->vid0_gpiod);
	245	gflags = max8952->vid1 ? GPIOD_OUT_HIGH : GPIOD_OUT_LOW;
	246	max8952->vid1_gpiod = devm_gpiod_get_index_optional(&client->dev,
	247	"max8952,vid",
	248	1, gflags);
	249	if (IS_ERR(max8952->vid1_gpiod))
	250	return PTR_ERR(max8952->vid1_gpiod);
	251
	252	/* If either VID GPIO is missing just disable this */
	253	if (!max8952->vid0_gpiod \|\| !max8952->vid1_gpiod) {
b874f41c	254	dev_warn(&client->dev, "VID0/1 gpio invalid: "
fd742eaa	255	"DVS not available.\n");
202f4f53 MH	256	max8952->vid0 = 0;
202f4f53 MH	257	max8952->vid1 = 0;
fd742eaa LW	258	/* Make sure if we have any descriptors they get set to low */
	259	if (max8952->vid0_gpiod)
	260	gpiod_set_value(max8952->vid0_gpiod, 0);
	261	if (max8952->vid1_gpiod)
	262	gpiod_set_value(max8952->vid1_gpiod, 0);
202f4f53 MH	263
	264	/* Disable Pulldown of EN only */
	265	max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60);
	266
b874f41c	267	dev_err(&client->dev, "DVS modes disabled because VID0 and VID1"
202f4f53 MH	268	" do not have proper controls.\n");
	269	} else {
	270	/*
	271	* Disable Pulldown on EN, VID0, VID1 to reduce
	272	* leakage current of MAX8952 assuming that MAX8952
	273	* is turned on (EN==1). Note that without having VID0/1
	274	* properly connected, turning pulldown off can be
	275	* problematic. Thus, turn this off only when they are
	276	* controllable by GPIO.
	277	*/
	278	max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0);
	279	}
	280
	281	max8952_write_reg(max8952, MAX8952_REG_MODE0,
	282	(max8952_read_reg(max8952,
	283	MAX8952_REG_MODE0) & 0xC0) \|
	284	(pdata->dvs_mode[0] & 0x3F));
	285	max8952_write_reg(max8952, MAX8952_REG_MODE1,
	286	(max8952_read_reg(max8952,
	287	MAX8952_REG_MODE1) & 0xC0) \|
	288	(pdata->dvs_mode[1] & 0x3F));
	289	max8952_write_reg(max8952, MAX8952_REG_MODE2,
	290	(max8952_read_reg(max8952,
	291	MAX8952_REG_MODE2) & 0xC0) \|
	292	(pdata->dvs_mode[2] & 0x3F));
	293	max8952_write_reg(max8952, MAX8952_REG_MODE3,
	294	(max8952_read_reg(max8952,
	295	MAX8952_REG_MODE3) & 0xC0) \|
	296	(pdata->dvs_mode[3] & 0x3F));
	297
	298	max8952_write_reg(max8952, MAX8952_REG_SYNC,
	299	(max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) \|
	300	((pdata->sync_freq & 0x3) << 6));
	301	max8952_write_reg(max8952, MAX8952_REG_RAMP,
	302	(max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) \|
	303	((pdata->ramp_speed & 0x7) << 5));
	304
	305	i2c_set_clientdata(client, max8952);
	306
da05738e	307	return 0;
202f4f53 MH	308	}
202f4f53 MH	309
202f4f53 MH	310	static const struct i2c_device_id max8952_ids[] = {
	311	{ "max8952", 0 },
	312	{ },
	313	};
	314	MODULE_DEVICE_TABLE(i2c, max8952_ids);
	315
	316	static struct i2c_driver max8952_pmic_driver = {
	317	.probe = max8952_pmic_probe,
202f4f53 MH	318	.driver = {
202f4f53 MH	319	.name = "max8952",
3ff4aa95	320	.of_match_table = of_match_ptr(max8952_dt_match),
202f4f53 MH	321	},
	322	.id_table = max8952_ids,
	323	};
	324
	325	static int __init max8952_pmic_init(void)
	326	{
	327	return i2c_add_driver(&max8952_pmic_driver);
	328	}
	329	subsys_initcall(max8952_pmic_init);
	330
	331	static void __exit max8952_pmic_exit(void)
	332	{
	333	i2c_del_driver(&max8952_pmic_driver);
	334	}
	335	module_exit(max8952_pmic_exit);
	336
	337	MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
	338	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	339	MODULE_LICENSE("GPL");