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

/*
 * max8952.c - Voltage and current regulation for the Maxim 8952
 *
 * Copyright (C) 2010 Samsung Electronics
 * MyungJoo Ham <myungjoo.ham@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#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.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_gpio.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;

	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 (!gpio_is_valid(max8952->pdata->gpio_vid0) ||
			!gpio_is_valid(max8952->pdata->gpio_vid1)) {
		/* DVS not supported */
		return -EPERM;
	}

	max8952->vid0 = selector & 0x1;
	max8952->vid1 = (selector >> 1) & 0x1;
	gpio_set_value(max8952->pdata->gpio_vid0, max8952->vid0);
	gpio_set_value(max8952->pdata->gpio_vid1, 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;

	pd->gpio_vid0 = of_get_named_gpio(np, "max8952,vid-gpios", 0);
	pd->gpio_vid1 = of_get_named_gpio(np, "max8952,vid-gpios", 1);

	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 = to_i2c_adapter(client->dev.parent);
	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, err = 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;
	gpiod = devm_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;

	if (gpio_is_valid(pdata->gpio_vid0) &&
			gpio_is_valid(pdata->gpio_vid1)) {
		unsigned long gpio_flags;

		gpio_flags = max8952->vid0 ?
			     GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
		if (devm_gpio_request_one(&client->dev, pdata->gpio_vid0,
					  gpio_flags, "MAX8952 VID0"))
			err = 1;

		gpio_flags = max8952->vid1 ?
			     GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
		if (devm_gpio_request_one(&client->dev, pdata->gpio_vid1,
					  gpio_flags, "MAX8952 VID1"))
			err = 2;
	} else
		err = 3;

	if (err) {
		dev_warn(&client->dev, "VID0/1 gpio invalid: "
				"DVS not available.\n");
		max8952->vid0 = 0;
		max8952->vid1 = 0;
		/* Mark invalid */
		pdata->gpio_vid0 = -1;
		pdata->gpio_vid1 = -1;

		/* 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
202f4f53 MH	1	/*
	2	* max8952.c - Voltage and current regulation for the Maxim 8952
	3	*
	4	* Copyright (C) 2010 Samsung Electronics
	5	* MyungJoo Ham <myungjoo.ham@samsung.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 as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/init.h>
	24	#include <linux/i2c.h>
	25	#include <linux/err.h>
	26	#include <linux/platform_device.h>
	27	#include <linux/regulator/driver.h>
	28	#include <linux/regulator/max8952.h>
202f4f53	29	#include <linux/gpio.h>
d7a261c2	30	#include <linux/gpio/consumer.h>
202f4f53	31	#include <linux/io.h>
3ff4aa95 TF	32	#include <linux/of.h>
	33	#include <linux/of_gpio.h>
	34	#include <linux/regulator/of_regulator.h>
202f4f53 MH	35	#include <linux/slab.h>
	36
	37	/* Registers */
	38	enum {
	39	MAX8952_REG_MODE0,
	40	MAX8952_REG_MODE1,
	41	MAX8952_REG_MODE2,
	42	MAX8952_REG_MODE3,
	43	MAX8952_REG_CONTROL,
	44	MAX8952_REG_SYNC,
	45	MAX8952_REG_RAMP,
	46	MAX8952_REG_CHIP_ID1,
	47	MAX8952_REG_CHIP_ID2,
	48	};
	49
	50	struct max8952_data {
	51	struct i2c_client *client;
202f4f53	52	struct max8952_platform_data *pdata;
202f4f53 MH	53
	54	bool vid0;
	55	bool vid1;
202f4f53 MH	56	};
	57
	58	static int max8952_read_reg(struct max8952_data *max8952, u8 reg)
	59	{
	60	int ret = i2c_smbus_read_byte_data(max8952->client, reg);
a5f8f963	61
202f4f53 MH	62	if (ret > 0)
	63	ret &= 0xff;
	64
	65	return ret;
	66	}
	67
	68	static int max8952_write_reg(struct max8952_data *max8952,
	69	u8 reg, u8 value)
	70	{
	71	return i2c_smbus_write_byte_data(max8952->client, reg, value);
	72	}
	73
202f4f53 MH	74	static int max8952_list_voltage(struct regulator_dev *rdev,
	75	unsigned int selector)
	76	{
	77	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
	78
	79	if (rdev_get_id(rdev) != 0)
	80	return -EINVAL;
	81
b9b49af5	82	return (max8952->pdata->dvs_mode[selector] * 10 + 770) * 1000;
202f4f53 MH	83	}
202f4f53 MH	84
b9b49af5	85	static int max8952_get_voltage_sel(struct regulator_dev *rdev)
202f4f53 MH	86	{
	87	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
	88	u8 vid = 0;
	89
	90	if (max8952->vid0)
	91	vid += 1;
	92	if (max8952->vid1)
	93	vid += 2;
	94
b9b49af5	95	return vid;
202f4f53 MH	96	}
202f4f53 MH	97
6ea67d04 AL	98	static int max8952_set_voltage_sel(struct regulator_dev *rdev,
6ea67d04 AL	99	unsigned selector)
202f4f53 MH	100	{
202f4f53 MH	101	struct max8952_data *max8952 = rdev_get_drvdata(rdev);
202f4f53 MH	102
202f4f53 MH	103	if (!gpio_is_valid(max8952->pdata->gpio_vid0) \|\|
e2cf3137	104	!gpio_is_valid(max8952->pdata->gpio_vid1)) {
202f4f53 MH	105	/* DVS not supported */
	106	return -EPERM;
	107	}
	108
6ea67d04 AL	109	max8952->vid0 = selector & 0x1;
	110	max8952->vid1 = (selector >> 1) & 0x1;
	111	gpio_set_value(max8952->pdata->gpio_vid0, max8952->vid0);
	112	gpio_set_value(max8952->pdata->gpio_vid1, max8952->vid1);
202f4f53 MH	113
	114	return 0;
	115	}
	116
6e09f4af	117	static const struct regulator_ops max8952_ops = {
202f4f53	118	.list_voltage = max8952_list_voltage,
b9b49af5	119	.get_voltage_sel = max8952_get_voltage_sel,
6ea67d04	120	.set_voltage_sel = max8952_set_voltage_sel,
202f4f53 MH	121	};
202f4f53 MH	122
bd6ff0d6	123	static const struct regulator_desc regulator = {
202f4f53 MH	124	.name = "MAX8952_VOUT",
	125	.id = 0,
	126	.n_voltages = MAX8952_NUM_DVS_MODE,
	127	.ops = &max8952_ops,
	128	.type = REGULATOR_VOLTAGE,
	129	.owner = THIS_MODULE,
	130	};
	131
3ff4aa95	132	#ifdef CONFIG_OF
cfe6e333	133	static const struct of_device_id max8952_dt_match[] = {
3ff4aa95 TF	134	{ .compatible = "maxim,max8952" },
	135	{},
	136	};
	137	MODULE_DEVICE_TABLE(of, max8952_dt_match);
	138
	139	static struct max8952_platform_data max8952_parse_dt(struct device dev)
	140	{
	141	struct max8952_platform_data *pd;
	142	struct device_node *np = dev->of_node;
	143	int ret;
	144	int i;
	145
	146	pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
7752d964	147	if (!pd)
3ff4aa95	148	return NULL;
3ff4aa95 TF	149
	150	pd->gpio_vid0 = of_get_named_gpio(np, "max8952,vid-gpios", 0);
	151	pd->gpio_vid1 = of_get_named_gpio(np, "max8952,vid-gpios", 1);
3ff4aa95 TF	152
	153	if (of_property_read_u32(np, "max8952,default-mode", &pd->default_mode))
	154	dev_warn(dev, "Default mode not specified, assuming 0\n");
	155
	156	ret = of_property_read_u32_array(np, "max8952,dvs-mode-microvolt",
	157	pd->dvs_mode, ARRAY_SIZE(pd->dvs_mode));
	158	if (ret) {
	159	dev_err(dev, "max8952,dvs-mode-microvolt property not specified");
	160	return NULL;
	161	}
	162
	163	for (i = 0; i < ARRAY_SIZE(pd->dvs_mode); ++i) {
	164	if (pd->dvs_mode[i] < 770000 \|\| pd->dvs_mode[i] > 1400000) {
	165	dev_err(dev, "DVS voltage %d out of range\n", i);
	166	return NULL;
	167	}
	168	pd->dvs_mode[i] = (pd->dvs_mode[i] - 770000) / 10000;
	169	}
	170
	171	if (of_property_read_u32(np, "max8952,sync-freq", &pd->sync_freq))
	172	dev_warn(dev, "max8952,sync-freq property not specified, defaulting to 26MHz\n");
	173
	174	if (of_property_read_u32(np, "max8952,ramp-speed", &pd->ramp_speed))
	175	dev_warn(dev, "max8952,ramp-speed property not specified, defaulting to 32mV/us\n");
	176
072e78b1	177	pd->reg_data = of_get_regulator_init_data(dev, np, &regulator);
3ff4aa95 TF	178	if (!pd->reg_data) {
	179	dev_err(dev, "Failed to parse regulator init data\n");
	180	return NULL;
	181	}
	182
	183	return pd;
	184	}
	185	#else
	186	static struct max8952_platform_data max8952_parse_dt(struct device dev)
	187	{
	188	return NULL;
	189	}
	190	#endif
	191
a5023574	192	static int max8952_pmic_probe(struct i2c_client *client,
202f4f53 MH	193	const struct i2c_device_id *i2c_id)
	194	{
	195	struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
dff91d0b	196	struct max8952_platform_data *pdata = dev_get_platdata(&client->dev);
c172708d	197	struct regulator_config config = { };
202f4f53	198	struct max8952_data *max8952;
b874f41c	199	struct regulator_dev *rdev;
d7a261c2 LW	200	struct gpio_desc *gpiod;
d7a261c2 LW	201	enum gpiod_flags gflags;
202f4f53 MH	202
	203	int ret = 0, err = 0;
	204
3ff4aa95 TF	205	if (client->dev.of_node)
	206	pdata = max8952_parse_dt(&client->dev);
	207
202f4f53 MH	208	if (!pdata) {
	209	dev_err(&client->dev, "Require the platform data\n");
	210	return -EINVAL;
	211	}
	212
	213	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
	214	return -EIO;
	215
372de4aa AL	216	max8952 = devm_kzalloc(&client->dev, sizeof(struct max8952_data),
372de4aa AL	217	GFP_KERNEL);
202f4f53 MH	218	if (!max8952)
	219	return -ENOMEM;
	220
	221	max8952->client = client;
202f4f53	222	max8952->pdata = pdata;
202f4f53	223
b874f41c	224	config.dev = &client->dev;
3ec6eb9c	225	config.init_data = pdata->reg_data;
c172708d	226	config.driver_data = max8952;
71622e15	227	config.of_node = client->dev.of_node;
c172708d	228
3ec6eb9c	229	if (pdata->reg_data->constraints.boot_on)
d7a261c2 LW	230	gflags = GPIOD_OUT_HIGH;
	231	else
	232	gflags = GPIOD_OUT_LOW;
	233	gpiod = devm_gpiod_get_optional(&client->dev,
	234	"max8952,en",
	235	gflags);
	236	if (IS_ERR(gpiod))
	237	return PTR_ERR(gpiod);
	238	if (gpiod)
	239	config.ena_gpiod = gpiod;
b669e0ad	240
b874f41c	241	rdev = devm_regulator_register(&client->dev, &regulator, &config);
b874f41c KK	242	if (IS_ERR(rdev)) {
	243	ret = PTR_ERR(rdev);
	244	dev_err(&client->dev, "regulator init failed (%d)\n", ret);
372de4aa	245	return ret;
da05738e	246	}
202f4f53	247
c8237f01 AL	248	max8952->vid0 = pdata->default_mode & 0x1;
c8237f01 AL	249	max8952->vid1 = (pdata->default_mode >> 1) & 0x1;
202f4f53	250
202f4f53 MH	251	if (gpio_is_valid(pdata->gpio_vid0) &&
202f4f53 MH	252	gpio_is_valid(pdata->gpio_vid1)) {
d7da152c AL	253	unsigned long gpio_flags;
	254
	255	gpio_flags = max8952->vid0 ?
	256	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
	257	if (devm_gpio_request_one(&client->dev, pdata->gpio_vid0,
	258	gpio_flags, "MAX8952 VID0"))
202f4f53 MH	259	err = 1;
202f4f53 MH	260
d7da152c AL	261	gpio_flags = max8952->vid1 ?
	262	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
	263	if (devm_gpio_request_one(&client->dev, pdata->gpio_vid1,
	264	gpio_flags, "MAX8952 VID1"))
202f4f53	265	err = 2;
202f4f53 MH	266	} else
	267	err = 3;
	268
	269	if (err) {
b874f41c	270	dev_warn(&client->dev, "VID0/1 gpio invalid: "
25985edc	271	"DVS not available.\n");
202f4f53 MH	272	max8952->vid0 = 0;
	273	max8952->vid1 = 0;
	274	/* Mark invalid */
	275	pdata->gpio_vid0 = -1;
	276	pdata->gpio_vid1 = -1;
	277
	278	/* Disable Pulldown of EN only */
	279	max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x60);
	280
b874f41c	281	dev_err(&client->dev, "DVS modes disabled because VID0 and VID1"
202f4f53 MH	282	" do not have proper controls.\n");
	283	} else {
	284	/*
	285	* Disable Pulldown on EN, VID0, VID1 to reduce
	286	* leakage current of MAX8952 assuming that MAX8952
	287	* is turned on (EN==1). Note that without having VID0/1
	288	* properly connected, turning pulldown off can be
	289	* problematic. Thus, turn this off only when they are
	290	* controllable by GPIO.
	291	*/
	292	max8952_write_reg(max8952, MAX8952_REG_CONTROL, 0x0);
	293	}
	294
	295	max8952_write_reg(max8952, MAX8952_REG_MODE0,
	296	(max8952_read_reg(max8952,
	297	MAX8952_REG_MODE0) & 0xC0) \|
	298	(pdata->dvs_mode[0] & 0x3F));
	299	max8952_write_reg(max8952, MAX8952_REG_MODE1,
	300	(max8952_read_reg(max8952,
	301	MAX8952_REG_MODE1) & 0xC0) \|
	302	(pdata->dvs_mode[1] & 0x3F));
	303	max8952_write_reg(max8952, MAX8952_REG_MODE2,
	304	(max8952_read_reg(max8952,
	305	MAX8952_REG_MODE2) & 0xC0) \|
	306	(pdata->dvs_mode[2] & 0x3F));
	307	max8952_write_reg(max8952, MAX8952_REG_MODE3,
	308	(max8952_read_reg(max8952,
	309	MAX8952_REG_MODE3) & 0xC0) \|
	310	(pdata->dvs_mode[3] & 0x3F));
	311
	312	max8952_write_reg(max8952, MAX8952_REG_SYNC,
	313	(max8952_read_reg(max8952, MAX8952_REG_SYNC) & 0x3F) \|
	314	((pdata->sync_freq & 0x3) << 6));
	315	max8952_write_reg(max8952, MAX8952_REG_RAMP,
	316	(max8952_read_reg(max8952, MAX8952_REG_RAMP) & 0x1F) \|
	317	((pdata->ramp_speed & 0x7) << 5));
	318
	319	i2c_set_clientdata(client, max8952);
	320
da05738e	321	return 0;
202f4f53 MH	322	}
202f4f53 MH	323
202f4f53 MH	324	static const struct i2c_device_id max8952_ids[] = {
	325	{ "max8952", 0 },
	326	{ },
	327	};
	328	MODULE_DEVICE_TABLE(i2c, max8952_ids);
	329
	330	static struct i2c_driver max8952_pmic_driver = {
	331	.probe = max8952_pmic_probe,
202f4f53 MH	332	.driver = {
202f4f53 MH	333	.name = "max8952",
3ff4aa95	334	.of_match_table = of_match_ptr(max8952_dt_match),
202f4f53 MH	335	},
	336	.id_table = max8952_ids,
	337	};
	338
	339	static int __init max8952_pmic_init(void)
	340	{
	341	return i2c_add_driver(&max8952_pmic_driver);
	342	}
	343	subsys_initcall(max8952_pmic_init);
	344
	345	static void __exit max8952_pmic_exit(void)
	346	{
	347	i2c_del_driver(&max8952_pmic_driver);
	348	}
	349	module_exit(max8952_pmic_exit);
	350
	351	MODULE_DESCRIPTION("MAXIM 8952 voltage regulator driver");
	352	MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
	353	MODULE_LICENSE("GPL");