[mirror_ubuntu-artful-kernel.git] / drivers / regulator / lp3971.c

/*
 * Regulator driver for National Semiconductors LP3971 PMIC chip
 *
 *  Copyright (C) 2009 Samsung Electronics
 *  Author: Marek Szyprowski <m.szyprowski@samsung.com>
 *
 * Based on wm8350.c
 *
 * 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/bug.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/lp3971.h>
#include <linux/slab.h>

struct lp3971 {
	struct device *dev;
	struct mutex io_lock;
	struct i2c_client *i2c;
	int num_regulators;
	struct regulator_dev **rdev;
};

static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);

#define LP3971_SYS_CONTROL1_REG 0x07

/* System control register 1 initial value,
   bits 4 and 5 are EPROM programmable */
#define SYS_CONTROL1_INIT_VAL 0x40
#define SYS_CONTROL1_INIT_MASK 0xCF

#define LP3971_BUCK_VOL_ENABLE_REG 0x10
#define LP3971_BUCK_VOL_CHANGE_REG 0x20

/*	Voltage control registers shift:
	LP3971_BUCK1 -> 0
	LP3971_BUCK2 -> 4
	LP3971_BUCK3 -> 6
*/
#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
#define BUCK_VOL_CHANGE_FLAG_GO 0x01
#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
#define BUCK_VOL_CHANGE_FLAG_MASK 0x03

#define LP3971_BUCK1_BASE 0x23
#define LP3971_BUCK2_BASE 0x29
#define LP3971_BUCK3_BASE 0x32

static const int buck_base_addr[] = {
	LP3971_BUCK1_BASE,
	LP3971_BUCK2_BASE,
	LP3971_BUCK3_BASE,
};

#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)

static const unsigned int buck_voltage_map[] = {
	      0,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
	1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
	3000000, 3300000,
};

#define BUCK_TARGET_VOL_MASK 0x3f

#define LP3971_BUCK_RAMP_REG(x)	(buck_base_addr[x]+2)

#define LP3971_LDO_ENABLE_REG 0x12
#define LP3971_LDO_VOL_CONTR_BASE 0x39

/*	Voltage control registers:
	LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
	LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
	LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
	LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
	LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
*/
#define LP3971_LDO_VOL_CONTR_REG(x)	(LP3971_LDO_VOL_CONTR_BASE + (x >> 1))

/*	Voltage control registers shift:
	LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
	LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
	LP3971_LDO5 -> 0
*/
#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
#define LDO_VOL_CONTR_MASK 0x0f

static const unsigned int ldo45_voltage_map[] = {
	1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
	1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
};

static const unsigned int ldo123_voltage_map[] = {
	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
	2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
};

#define LDO_VOL_MIN_IDX 0x00
#define LDO_VOL_MAX_IDX 0x0f

static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 mask = 1 << (1 + ldo);
	u16 val;

	val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
	return (val & mask) != 0;
}

static int lp3971_ldo_enable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 mask = 1 << (1 + ldo);

	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
}

static int lp3971_ldo_disable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 mask = 1 << (1 + ldo);

	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
}

static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 val, reg;

	reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
	val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;

	return val;
}

static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
				      unsigned int selector)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;

	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
			LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
			selector << LDO_VOL_CONTR_SHIFT(ldo));
}

static struct regulator_ops lp3971_ldo_ops = {
	.list_voltage = regulator_list_voltage_table,
	.is_enabled = lp3971_ldo_is_enabled,
	.enable = lp3971_ldo_enable,
	.disable = lp3971_ldo_disable,
	.get_voltage_sel = lp3971_ldo_get_voltage_sel,
	.set_voltage_sel = lp3971_ldo_set_voltage_sel,
};

static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 mask = 1 << (buck * 2);
	u16 val;

	val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
	return (val & mask) != 0;
}

static int lp3971_dcdc_enable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 mask = 1 << (buck * 2);

	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
}

static int lp3971_dcdc_disable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 mask = 1 << (buck * 2);

	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
}

static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 reg;

	reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
	reg &= BUCK_TARGET_VOL_MASK;

	return reg;
}

static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
				       unsigned int selector)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	int ret;

	ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
	       BUCK_TARGET_VOL_MASK, selector);
	if (ret)
		return ret;

	ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	       BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	       BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
	if (ret)
		return ret;

	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	       BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	       0 << BUCK_VOL_CHANGE_SHIFT(buck));
}

static struct regulator_ops lp3971_dcdc_ops = {
	.list_voltage = regulator_list_voltage_table,
	.is_enabled = lp3971_dcdc_is_enabled,
	.enable = lp3971_dcdc_enable,
	.disable = lp3971_dcdc_disable,
	.get_voltage_sel = lp3971_dcdc_get_voltage_sel,
	.set_voltage_sel = lp3971_dcdc_set_voltage_sel,
};

static const struct regulator_desc regulators[] = {
	{
		.name = "LDO1",
		.id = LP3971_LDO1,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
		.volt_table = ldo123_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO2",
		.id = LP3971_LDO2,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
		.volt_table = ldo123_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO3",
		.id = LP3971_LDO3,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
		.volt_table = ldo123_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO4",
		.id = LP3971_LDO4,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
		.volt_table = ldo45_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO5",
		.id = LP3971_LDO5,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
		.volt_table = ldo45_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC1",
		.id = LP3971_DCDC1,
		.ops = &lp3971_dcdc_ops,
		.n_voltages = ARRAY_SIZE(buck_voltage_map),
		.volt_table = buck_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC2",
		.id = LP3971_DCDC2,
		.ops = &lp3971_dcdc_ops,
		.n_voltages = ARRAY_SIZE(buck_voltage_map),
		.volt_table = buck_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC3",
		.id = LP3971_DCDC3,
		.ops = &lp3971_dcdc_ops,
		.n_voltages = ARRAY_SIZE(buck_voltage_map),
		.volt_table = buck_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
};

static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
	u16 *dest)
{
	int ret;

	if (count != 1)
		return -EIO;
	ret = i2c_smbus_read_byte_data(i2c, reg);
	if (ret < 0)
		return -EIO;

	*dest = ret;
	return 0;
}

static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
	const u16 *src)
{
	if (count != 1)
		return -EIO;
	return i2c_smbus_write_byte_data(i2c, reg, *src);
}

static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
{
	u16 val = 0;

	mutex_lock(&lp3971->io_lock);

	lp3971_i2c_read(lp3971->i2c, reg, 1, &val);

	dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
		(unsigned)val&0xff);

	mutex_unlock(&lp3971->io_lock);

	return val & 0xff;
}

static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
{
	u16 tmp;
	int ret;

	mutex_lock(&lp3971->io_lock);

	ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
	tmp = (tmp & ~mask) | val;
	if (ret == 0) {
		ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
		dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
			(unsigned)val&0xff);
	}
	mutex_unlock(&lp3971->io_lock);

	return ret;
}

static int setup_regulators(struct lp3971 *lp3971,
				      struct lp3971_platform_data *pdata)
{
	int i, err;

	lp3971->num_regulators = pdata->num_regulators;
	lp3971->rdev = kcalloc(pdata->num_regulators,
				sizeof(struct regulator_dev *), GFP_KERNEL);
	if (!lp3971->rdev) {
		err = -ENOMEM;
		goto err_nomem;
	}

	/* Instantiate the regulators */
	for (i = 0; i < pdata->num_regulators; i++) {
		struct regulator_config config = { };
		struct lp3971_regulator_subdev *reg = &pdata->regulators[i];

		config.dev = lp3971->dev;
		config.init_data = reg->initdata;
		config.driver_data = lp3971;

		lp3971->rdev[i] = regulator_register(&regulators[reg->id],
						     &config);
		if (IS_ERR(lp3971->rdev[i])) {
			err = PTR_ERR(lp3971->rdev[i]);
			dev_err(lp3971->dev, "regulator init failed: %d\n",
				err);
			goto error;
		}
	}

	return 0;

error:
	while (--i >= 0)
		regulator_unregister(lp3971->rdev[i]);
	kfree(lp3971->rdev);
	lp3971->rdev = NULL;
err_nomem:
	return err;
}

static int lp3971_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct lp3971 *lp3971;
	struct lp3971_platform_data *pdata = i2c->dev.platform_data;
	int ret;
	u16 val;

	if (!pdata) {
		dev_dbg(&i2c->dev, "No platform init data supplied\n");
		return -ENODEV;
	}

	lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
	if (lp3971 == NULL)
		return -ENOMEM;

	lp3971->i2c = i2c;
	lp3971->dev = &i2c->dev;

	mutex_init(&lp3971->io_lock);

	/* Detect LP3971 */
	ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
	if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
		ret = -ENODEV;
	if (ret < 0) {
		dev_err(&i2c->dev, "failed to detect device\n");
		goto err_detect;
	}

	ret = setup_regulators(lp3971, pdata);
	if (ret < 0)
		goto err_detect;

	i2c_set_clientdata(i2c, lp3971);
	return 0;

err_detect:
	kfree(lp3971);
	return ret;
}

static int lp3971_i2c_remove(struct i2c_client *i2c)
{
	struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
	int i;

	for (i = 0; i < lp3971->num_regulators; i++)
		regulator_unregister(lp3971->rdev[i]);

	kfree(lp3971->rdev);
	kfree(lp3971);

	return 0;
}

static const struct i2c_device_id lp3971_i2c_id[] = {
       { "lp3971", 0 },
       { }
};
MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);

static struct i2c_driver lp3971_i2c_driver = {
	.driver = {
		.name = "LP3971",
		.owner = THIS_MODULE,
	},
	.probe    = lp3971_i2c_probe,
	.remove   = lp3971_i2c_remove,
	.id_table = lp3971_i2c_id,
};

module_i2c_driver(lp3971_i2c_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
MODULE_DESCRIPTION("LP3971 PMIC driver");
Commit	Line	Data
0cbdf7bc MS	1	/*
	2	* Regulator driver for National Semiconductors LP3971 PMIC chip
	3	*
	4	* Copyright (C) 2009 Samsung Electronics
	5	* Author: Marek Szyprowski <m.szyprowski@samsung.com>
	6	*
	7	* Based on wm8350.c
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	*/
	14
	15	#include <linux/bug.h>
	16	#include <linux/err.h>
	17	#include <linux/i2c.h>
	18	#include <linux/kernel.h>
65602c32	19	#include <linux/module.h>
0cbdf7bc MS	20	#include <linux/regulator/driver.h>
0cbdf7bc MS	21	#include <linux/regulator/lp3971.h>
5a0e3ad6	22	#include <linux/slab.h>
0cbdf7bc MS	23
	24	struct lp3971 {
	25	struct device *dev;
	26	struct mutex io_lock;
	27	struct i2c_client *i2c;
	28	int num_regulators;
	29	struct regulator_dev **rdev;
	30	};
	31
	32	static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
	33	static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
	34
	35	#define LP3971_SYS_CONTROL1_REG 0x07
	36
	37	/* System control register 1 initial value,
	38	bits 4 and 5 are EPROM programmable */
	39	#define SYS_CONTROL1_INIT_VAL 0x40
	40	#define SYS_CONTROL1_INIT_MASK 0xCF
	41
	42	#define LP3971_BUCK_VOL_ENABLE_REG 0x10
	43	#define LP3971_BUCK_VOL_CHANGE_REG 0x20
	44
	45	/* Voltage control registers shift:
	46	LP3971_BUCK1 -> 0
	47	LP3971_BUCK2 -> 4
	48	LP3971_BUCK3 -> 6
	49	*/
451a73cd	50	#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) \| (x & ~0x01))
0cbdf7bc MS	51	#define BUCK_VOL_CHANGE_FLAG_GO 0x01
	52	#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
	53	#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
	54
	55	#define LP3971_BUCK1_BASE 0x23
	56	#define LP3971_BUCK2_BASE 0x29
	57	#define LP3971_BUCK3_BASE 0x32
	58
6faa7e0a	59	static const int buck_base_addr[] = {
0cbdf7bc MS	60	LP3971_BUCK1_BASE,
	61	LP3971_BUCK2_BASE,
	62	LP3971_BUCK3_BASE,
	63	};
	64
	65	#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
	66	#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
	67
cad8d76e AL	68	static const unsigned int buck_voltage_map[] = {
	69	0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
	70	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
	71	1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
	72	3000000, 3300000,
0cbdf7bc MS	73	};
	74
	75	#define BUCK_TARGET_VOL_MASK 0x3f
0cbdf7bc MS	76
	77	#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
	78
	79	#define LP3971_LDO_ENABLE_REG 0x12
	80	#define LP3971_LDO_VOL_CONTR_BASE 0x39
	81
	82	/* Voltage control registers:
	83	LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
	84	LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
	85	LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
	86	LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
	87	LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
	88	*/
	89	#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
	90
	91	/* Voltage control registers shift:
	92	LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
	93	LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
	94	LP3971_LDO5 -> 0
	95	*/
	96	#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
	97	#define LDO_VOL_CONTR_MASK 0x0f
	98
cad8d76e AL	99	static const unsigned int ldo45_voltage_map[] = {
	100	1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
	101	1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
0cbdf7bc MS	102	};
0cbdf7bc MS	103
cad8d76e AL	104	static const unsigned int ldo123_voltage_map[] = {
	105	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
	106	2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
0cbdf7bc MS	107	};
0cbdf7bc MS	108
0cbdf7bc MS	109	#define LDO_VOL_MIN_IDX 0x00
	110	#define LDO_VOL_MAX_IDX 0x0f
	111
0cbdf7bc MS	112	static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
	113	{
	114	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	115	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	116	u16 mask = 1 << (1 + ldo);
	117	u16 val;
	118
	119	val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
	120	return (val & mask) != 0;
	121	}
	122
	123	static int lp3971_ldo_enable(struct regulator_dev *dev)
	124	{
	125	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	126	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	127	u16 mask = 1 << (1 + ldo);
	128
	129	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
	130	}
	131
	132	static int lp3971_ldo_disable(struct regulator_dev *dev)
	133	{
	134	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	135	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	136	u16 mask = 1 << (1 + ldo);
	137
	138	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
	139	}
	140
f38482fa	141	static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
0cbdf7bc MS	142	{
	143	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	144	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	145	u16 val, reg;
	146
	147	reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
	148	val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
	149
f38482fa	150	return val;
0cbdf7bc MS	151	}
0cbdf7bc MS	152
dd8e2314 AL	153	static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	154	unsigned int selector)
0cbdf7bc MS	155	{
	156	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	157	int ldo = rdev_get_id(dev) - LP3971_LDO1;
3a93f2a9	158
0cbdf7bc	159	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
cdb868f5	160	LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
dd8e2314	161	selector << LDO_VOL_CONTR_SHIFT(ldo));
0cbdf7bc MS	162	}
	163
	164	static struct regulator_ops lp3971_ldo_ops = {
cad8d76e	165	.list_voltage = regulator_list_voltage_table,
0cbdf7bc MS	166	.is_enabled = lp3971_ldo_is_enabled,
	167	.enable = lp3971_ldo_enable,
	168	.disable = lp3971_ldo_disable,
f38482fa	169	.get_voltage_sel = lp3971_ldo_get_voltage_sel,
dd8e2314	170	.set_voltage_sel = lp3971_ldo_set_voltage_sel,
0cbdf7bc MS	171	};
0cbdf7bc MS	172
0cbdf7bc MS	173	static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
	174	{
	175	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	176	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	177	u16 mask = 1 << (buck * 2);
	178	u16 val;
	179
	180	val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
	181	return (val & mask) != 0;
	182	}
	183
	184	static int lp3971_dcdc_enable(struct regulator_dev *dev)
	185	{
	186	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	187	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	188	u16 mask = 1 << (buck * 2);
	189
	190	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
	191	}
	192
	193	static int lp3971_dcdc_disable(struct regulator_dev *dev)
	194	{
	195	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	196	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	197	u16 mask = 1 << (buck * 2);
	198
	199	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
	200	}
	201
f38482fa	202	static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
0cbdf7bc MS	203	{
	204	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	205	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	206	u16 reg;
0cbdf7bc MS	207
	208	reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
	209	reg &= BUCK_TARGET_VOL_MASK;
	210
f38482fa	211	return reg;
0cbdf7bc MS	212	}
0cbdf7bc MS	213
dd8e2314 AL	214	static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	215	unsigned int selector)
0cbdf7bc MS	216	{
	217	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	218	int buck = rdev_get_id(dev) - LP3971_DCDC1;
0cbdf7bc MS	219	int ret;
0cbdf7bc MS	220
0cbdf7bc	221	ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
dd8e2314	222	BUCK_TARGET_VOL_MASK, selector);
0cbdf7bc MS	223	if (ret)
	224	return ret;
	225
	226	ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	227	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	228	BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
	229	if (ret)
	230	return ret;
	231
	232	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	233	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	234	0 << BUCK_VOL_CHANGE_SHIFT(buck));
	235	}
	236
	237	static struct regulator_ops lp3971_dcdc_ops = {
cad8d76e	238	.list_voltage = regulator_list_voltage_table,
0cbdf7bc MS	239	.is_enabled = lp3971_dcdc_is_enabled,
	240	.enable = lp3971_dcdc_enable,
	241	.disable = lp3971_dcdc_disable,
f38482fa	242	.get_voltage_sel = lp3971_dcdc_get_voltage_sel,
dd8e2314	243	.set_voltage_sel = lp3971_dcdc_set_voltage_sel,
0cbdf7bc MS	244	};
0cbdf7bc MS	245
14add4ff	246	static const struct regulator_desc regulators[] = {
0cbdf7bc MS	247	{
	248	.name = "LDO1",
	249	.id = LP3971_LDO1,
	250	.ops = &lp3971_ldo_ops,
	251	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	252	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	253	.type = REGULATOR_VOLTAGE,
	254	.owner = THIS_MODULE,
	255	},
	256	{
	257	.name = "LDO2",
	258	.id = LP3971_LDO2,
	259	.ops = &lp3971_ldo_ops,
	260	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	261	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	262	.type = REGULATOR_VOLTAGE,
	263	.owner = THIS_MODULE,
	264	},
	265	{
	266	.name = "LDO3",
	267	.id = LP3971_LDO3,
	268	.ops = &lp3971_ldo_ops,
	269	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	270	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	271	.type = REGULATOR_VOLTAGE,
	272	.owner = THIS_MODULE,
	273	},
	274	{
	275	.name = "LDO4",
	276	.id = LP3971_LDO4,
	277	.ops = &lp3971_ldo_ops,
	278	.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
cad8d76e	279	.volt_table = ldo45_voltage_map,
0cbdf7bc MS	280	.type = REGULATOR_VOLTAGE,
	281	.owner = THIS_MODULE,
	282	},
	283	{
	284	.name = "LDO5",
	285	.id = LP3971_LDO5,
	286	.ops = &lp3971_ldo_ops,
	287	.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
cad8d76e	288	.volt_table = ldo45_voltage_map,
0cbdf7bc MS	289	.type = REGULATOR_VOLTAGE,
	290	.owner = THIS_MODULE,
	291	},
	292	{
	293	.name = "DCDC1",
	294	.id = LP3971_DCDC1,
	295	.ops = &lp3971_dcdc_ops,
	296	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	297	.volt_table = buck_voltage_map,
0cbdf7bc MS	298	.type = REGULATOR_VOLTAGE,
	299	.owner = THIS_MODULE,
	300	},
	301	{
	302	.name = "DCDC2",
	303	.id = LP3971_DCDC2,
	304	.ops = &lp3971_dcdc_ops,
	305	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	306	.volt_table = buck_voltage_map,
0cbdf7bc MS	307	.type = REGULATOR_VOLTAGE,
	308	.owner = THIS_MODULE,
	309	},
	310	{
	311	.name = "DCDC3",
	312	.id = LP3971_DCDC3,
	313	.ops = &lp3971_dcdc_ops,
	314	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	315	.volt_table = buck_voltage_map,
0cbdf7bc MS	316	.type = REGULATOR_VOLTAGE,
	317	.owner = THIS_MODULE,
	318	},
	319	};
	320
	321	static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
	322	u16 *dest)
	323	{
	324	int ret;
	325
	326	if (count != 1)
	327	return -EIO;
	328	ret = i2c_smbus_read_byte_data(i2c, reg);
27ef7f00	329	if (ret < 0)
0cbdf7bc MS	330	return -EIO;
	331
	332	*dest = ret;
	333	return 0;
	334	}
	335
	336	static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
	337	const u16 *src)
	338	{
0cbdf7bc MS	339	if (count != 1)
0cbdf7bc MS	340	return -EIO;
1bddc2f5	341	return i2c_smbus_write_byte_data(i2c, reg, *src);
0cbdf7bc MS	342	}
	343
	344	static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
	345	{
	346	u16 val = 0;
	347
	348	mutex_lock(&lp3971->io_lock);
	349
	350	lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
	351
	352	dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
	353	(unsigned)val&0xff);
	354
	355	mutex_unlock(&lp3971->io_lock);
	356
	357	return val & 0xff;
	358	}
	359
	360	static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
	361	{
	362	u16 tmp;
	363	int ret;
	364
	365	mutex_lock(&lp3971->io_lock);
	366
	367	ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
	368	tmp = (tmp & ~mask) \| val;
	369	if (ret == 0) {
	370	ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
	371	dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
	372	(unsigned)val&0xff);
	373	}
	374	mutex_unlock(&lp3971->io_lock);
	375
	376	return ret;
	377	}
	378
a5023574	379	static int setup_regulators(struct lp3971 *lp3971,
ebbed04f	380	struct lp3971_platform_data *pdata)
0cbdf7bc MS	381	{
0cbdf7bc MS	382	int i, err;
ebbed04f DT	383
	384	lp3971->num_regulators = pdata->num_regulators;
	385	lp3971->rdev = kcalloc(pdata->num_regulators,
	386	sizeof(struct regulator_dev *), GFP_KERNEL);
67e46f34 DC	387	if (!lp3971->rdev) {
	388	err = -ENOMEM;
	389	goto err_nomem;
	390	}
0cbdf7bc MS	391
0cbdf7bc MS	392	/* Instantiate the regulators */
ebbed04f	393	for (i = 0; i < pdata->num_regulators; i++) {
c172708d	394	struct regulator_config config = { };
ebbed04f	395	struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
0cbdf7bc	396
c172708d MB	397	config.dev = lp3971->dev;
	398	config.init_data = reg->initdata;
	399	config.driver_data = lp3971;
	400
	401	lp3971->rdev[i] = regulator_register(&regulators[reg->id],
	402	&config);
d662fc82 JL	403	if (IS_ERR(lp3971->rdev[i])) {
d662fc82 JL	404	err = PTR_ERR(lp3971->rdev[i]);
0cbdf7bc MS	405	dev_err(lp3971->dev, "regulator init failed: %d\n",
	406	err);
	407	goto error;
	408	}
	409	}
	410
	411	return 0;
ebbed04f	412
0cbdf7bc	413	error:
ebbed04f DT	414	while (--i >= 0)
ebbed04f DT	415	regulator_unregister(lp3971->rdev[i]);
0cbdf7bc MS	416	kfree(lp3971->rdev);
0cbdf7bc MS	417	lp3971->rdev = NULL;
67e46f34	418	err_nomem:
0cbdf7bc MS	419	return err;
	420	}
	421
a5023574	422	static int lp3971_i2c_probe(struct i2c_client *i2c,
0cbdf7bc MS	423	const struct i2c_device_id *id)
	424	{
	425	struct lp3971 *lp3971;
	426	struct lp3971_platform_data *pdata = i2c->dev.platform_data;
	427	int ret;
	428	u16 val;
	429
ebbed04f DT	430	if (!pdata) {
	431	dev_dbg(&i2c->dev, "No platform init data supplied\n");
	432	return -ENODEV;
0cbdf7bc MS	433	}
0cbdf7bc MS	434
ebbed04f DT	435	lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
	436	if (lp3971 == NULL)
	437	return -ENOMEM;
	438
0cbdf7bc MS	439	lp3971->i2c = i2c;
0cbdf7bc MS	440	lp3971->dev = &i2c->dev;
0cbdf7bc MS	441
	442	mutex_init(&lp3971->io_lock);
	443
	444	/* Detect LP3971 */
	445	ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
	446	if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
	447	ret = -ENODEV;
	448	if (ret < 0) {
	449	dev_err(&i2c->dev, "failed to detect device\n");
	450	goto err_detect;
	451	}
	452
ebbed04f DT	453	ret = setup_regulators(lp3971, pdata);
	454	if (ret < 0)
	455	goto err_detect;
0cbdf7bc	456
ebbed04f	457	i2c_set_clientdata(i2c, lp3971);
0cbdf7bc MS	458	return 0;
	459
	460	err_detect:
0cbdf7bc	461	kfree(lp3971);
0cbdf7bc MS	462	return ret;
	463	}
	464
8dc995f5	465	static int lp3971_i2c_remove(struct i2c_client *i2c)
0cbdf7bc MS	466	{
	467	struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
	468	int i;
ebbed04f	469
0cbdf7bc	470	for (i = 0; i < lp3971->num_regulators; i++)
ebbed04f DT	471	regulator_unregister(lp3971->rdev[i]);
ebbed04f DT	472
0cbdf7bc	473	kfree(lp3971->rdev);
0cbdf7bc MS	474	kfree(lp3971);
	475
	476	return 0;
	477	}
	478
	479	static const struct i2c_device_id lp3971_i2c_id[] = {
	480	{ "lp3971", 0 },
	481	{ }
	482	};
	483	MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
	484
	485	static struct i2c_driver lp3971_i2c_driver = {
	486	.driver = {
	487	.name = "LP3971",
	488	.owner = THIS_MODULE,
	489	},
	490	.probe = lp3971_i2c_probe,
5eb9f2b9	491	.remove = lp3971_i2c_remove,
0cbdf7bc MS	492	.id_table = lp3971_i2c_id,
	493	};
	494
5af34e60	495	module_i2c_driver(lp3971_i2c_driver);
0cbdf7bc MS	496
	497	MODULE_LICENSE("GPL");
	498	MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
	499	MODULE_DESCRIPTION("LP3971 PMIC driver");