[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;
};

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,
	.map_voltage = regulator_map_voltage_ascend,
	.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,
	.map_voltage = regulator_map_voltage_ascend,
	.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 ret;

	*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);
	if (ret == 0) {
		tmp = (tmp & ~mask) | val;
		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;

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

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

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

	return 0;
}

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

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

	lp3971 = devm_kzalloc(&i2c->dev, 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");
		return ret;
	}

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

	i2c_set_clientdata(i2c, 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",
	},
	.probe    = lp3971_i2c_probe,
	.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;
0cbdf7bc MS	28	};
	29
	30	static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
	31	static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
	32
	33	#define LP3971_SYS_CONTROL1_REG 0x07
	34
	35	/* System control register 1 initial value,
	36	bits 4 and 5 are EPROM programmable */
	37	#define SYS_CONTROL1_INIT_VAL 0x40
	38	#define SYS_CONTROL1_INIT_MASK 0xCF
	39
	40	#define LP3971_BUCK_VOL_ENABLE_REG 0x10
	41	#define LP3971_BUCK_VOL_CHANGE_REG 0x20
	42
	43	/* Voltage control registers shift:
	44	LP3971_BUCK1 -> 0
	45	LP3971_BUCK2 -> 4
	46	LP3971_BUCK3 -> 6
	47	*/
451a73cd	48	#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) \| (x & ~0x01))
0cbdf7bc MS	49	#define BUCK_VOL_CHANGE_FLAG_GO 0x01
	50	#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
	51	#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
	52
	53	#define LP3971_BUCK1_BASE 0x23
	54	#define LP3971_BUCK2_BASE 0x29
	55	#define LP3971_BUCK3_BASE 0x32
	56
6faa7e0a	57	static const int buck_base_addr[] = {
0cbdf7bc MS	58	LP3971_BUCK1_BASE,
	59	LP3971_BUCK2_BASE,
	60	LP3971_BUCK3_BASE,
	61	};
	62
	63	#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
	64	#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
	65
cad8d76e AL	66	static const unsigned int buck_voltage_map[] = {
	67	0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
	68	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
	69	1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
	70	3000000, 3300000,
0cbdf7bc MS	71	};
	72
	73	#define BUCK_TARGET_VOL_MASK 0x3f
0cbdf7bc MS	74
	75	#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
	76
	77	#define LP3971_LDO_ENABLE_REG 0x12
	78	#define LP3971_LDO_VOL_CONTR_BASE 0x39
	79
	80	/* Voltage control registers:
	81	LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
	82	LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
	83	LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
	84	LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
	85	LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
	86	*/
	87	#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
	88
	89	/* Voltage control registers shift:
	90	LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
	91	LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
	92	LP3971_LDO5 -> 0
	93	*/
	94	#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
	95	#define LDO_VOL_CONTR_MASK 0x0f
	96
cad8d76e AL	97	static const unsigned int ldo45_voltage_map[] = {
	98	1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
	99	1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
0cbdf7bc MS	100	};
0cbdf7bc MS	101
cad8d76e AL	102	static const unsigned int ldo123_voltage_map[] = {
	103	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
	104	2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
0cbdf7bc MS	105	};
0cbdf7bc MS	106
0cbdf7bc MS	107	#define LDO_VOL_MIN_IDX 0x00
	108	#define LDO_VOL_MAX_IDX 0x0f
	109
0cbdf7bc MS	110	static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
	111	{
	112	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	113	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	114	u16 mask = 1 << (1 + ldo);
	115	u16 val;
	116
	117	val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
	118	return (val & mask) != 0;
	119	}
	120
	121	static int lp3971_ldo_enable(struct regulator_dev *dev)
	122	{
	123	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	124	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	125	u16 mask = 1 << (1 + ldo);
	126
	127	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
	128	}
	129
	130	static int lp3971_ldo_disable(struct regulator_dev *dev)
	131	{
	132	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	133	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	134	u16 mask = 1 << (1 + ldo);
	135
	136	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
	137	}
	138
f38482fa	139	static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
0cbdf7bc MS	140	{
	141	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	142	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	143	u16 val, reg;
	144
	145	reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
	146	val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
	147
f38482fa	148	return val;
0cbdf7bc MS	149	}
0cbdf7bc MS	150
dd8e2314 AL	151	static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	152	unsigned int selector)
0cbdf7bc MS	153	{
	154	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	155	int ldo = rdev_get_id(dev) - LP3971_LDO1;
3a93f2a9	156
0cbdf7bc	157	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
cdb868f5	158	LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
dd8e2314	159	selector << LDO_VOL_CONTR_SHIFT(ldo));
0cbdf7bc MS	160	}
	161
	162	static struct regulator_ops lp3971_ldo_ops = {
cad8d76e	163	.list_voltage = regulator_list_voltage_table,
3e655618	164	.map_voltage = regulator_map_voltage_ascend,
0cbdf7bc MS	165	.is_enabled = lp3971_ldo_is_enabled,
	166	.enable = lp3971_ldo_enable,
	167	.disable = lp3971_ldo_disable,
f38482fa	168	.get_voltage_sel = lp3971_ldo_get_voltage_sel,
dd8e2314	169	.set_voltage_sel = lp3971_ldo_set_voltage_sel,
0cbdf7bc MS	170	};
0cbdf7bc MS	171
0cbdf7bc MS	172	static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
	173	{
	174	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	175	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	176	u16 mask = 1 << (buck * 2);
	177	u16 val;
	178
	179	val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
	180	return (val & mask) != 0;
	181	}
	182
	183	static int lp3971_dcdc_enable(struct regulator_dev *dev)
	184	{
	185	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	186	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	187	u16 mask = 1 << (buck * 2);
	188
	189	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
	190	}
	191
	192	static int lp3971_dcdc_disable(struct regulator_dev *dev)
	193	{
	194	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	195	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	196	u16 mask = 1 << (buck * 2);
	197
	198	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
	199	}
	200
f38482fa	201	static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
0cbdf7bc MS	202	{
	203	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	204	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	205	u16 reg;
0cbdf7bc MS	206
	207	reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
	208	reg &= BUCK_TARGET_VOL_MASK;
	209
f38482fa	210	return reg;
0cbdf7bc MS	211	}
0cbdf7bc MS	212
dd8e2314 AL	213	static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	214	unsigned int selector)
0cbdf7bc MS	215	{
	216	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	217	int buck = rdev_get_id(dev) - LP3971_DCDC1;
0cbdf7bc MS	218	int ret;
0cbdf7bc MS	219
0cbdf7bc	220	ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
dd8e2314	221	BUCK_TARGET_VOL_MASK, selector);
0cbdf7bc MS	222	if (ret)
	223	return ret;
	224
	225	ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	226	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	227	BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
	228	if (ret)
	229	return ret;
	230
	231	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	232	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	233	0 << BUCK_VOL_CHANGE_SHIFT(buck));
	234	}
	235
	236	static struct regulator_ops lp3971_dcdc_ops = {
cad8d76e	237	.list_voltage = regulator_list_voltage_table,
3e655618	238	.map_voltage = regulator_map_voltage_ascend,
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)
a1985d46	330	return ret;
0cbdf7bc MS	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);
0cbdf7bc	368	if (ret == 0) {
40e1d79e	369	tmp = (tmp & ~mask) \| val;
0cbdf7bc MS	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	383
0cbdf7bc	384	/* Instantiate the regulators */
ebbed04f	385	for (i = 0; i < pdata->num_regulators; i++) {
c172708d	386	struct regulator_config config = { };
ebbed04f	387	struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
56dde80a	388	struct regulator_dev *rdev;
0cbdf7bc	389
c172708d MB	390	config.dev = lp3971->dev;
	391	config.init_data = reg->initdata;
	392	config.driver_data = lp3971;
	393
56dde80a AL	394	rdev = devm_regulator_register(lp3971->dev,
	395	&regulators[reg->id], &config);
	396	if (IS_ERR(rdev)) {
	397	err = PTR_ERR(rdev);
0cbdf7bc MS	398	dev_err(lp3971->dev, "regulator init failed: %d\n",
0cbdf7bc MS	399	err);
56dde80a	400	return err;
0cbdf7bc MS	401	}
	402	}
	403
	404	return 0;
0cbdf7bc MS	405	}
0cbdf7bc MS	406
a5023574	407	static int lp3971_i2c_probe(struct i2c_client *i2c,
0cbdf7bc MS	408	const struct i2c_device_id *id)
	409	{
	410	struct lp3971 *lp3971;
dff91d0b	411	struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
0cbdf7bc MS	412	int ret;
	413	u16 val;
	414
ebbed04f DT	415	if (!pdata) {
	416	dev_dbg(&i2c->dev, "No platform init data supplied\n");
	417	return -ENODEV;
0cbdf7bc MS	418	}
0cbdf7bc MS	419
2af0af67	420	lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
ebbed04f DT	421	if (lp3971 == NULL)
	422	return -ENOMEM;
	423
0cbdf7bc MS	424	lp3971->i2c = i2c;
0cbdf7bc MS	425	lp3971->dev = &i2c->dev;
0cbdf7bc MS	426
	427	mutex_init(&lp3971->io_lock);
	428
	429	/* Detect LP3971 */
	430	ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
	431	if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
	432	ret = -ENODEV;
	433	if (ret < 0) {
	434	dev_err(&i2c->dev, "failed to detect device\n");
2af0af67	435	return ret;
0cbdf7bc MS	436	}
0cbdf7bc MS	437
ebbed04f DT	438	ret = setup_regulators(lp3971, pdata);
ebbed04f DT	439	if (ret < 0)
2af0af67	440	return ret;
0cbdf7bc	441
ebbed04f	442	i2c_set_clientdata(i2c, lp3971);
0cbdf7bc	443	return 0;
0cbdf7bc MS	444	}
0cbdf7bc MS	445
0cbdf7bc	446	static const struct i2c_device_id lp3971_i2c_id[] = {
0a3ee93a JH	447	{ "lp3971", 0 },
0a3ee93a JH	448	{ }
0cbdf7bc MS	449	};
	450	MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
	451
	452	static struct i2c_driver lp3971_i2c_driver = {
	453	.driver = {
	454	.name = "LP3971",
0cbdf7bc MS	455	},
0cbdf7bc MS	456	.probe = lp3971_i2c_probe,
0cbdf7bc MS	457	.id_table = lp3971_i2c_id,
	458	};
	459
5af34e60	460	module_i2c_driver(lp3971_i2c_driver);
0cbdf7bc MS	461
	462	MODULE_LICENSE("GPL");
	463	MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
	464	MODULE_DESCRIPTION("LP3971 PMIC driver");