[linux-block.git] / drivers / regulator / lp3971.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Regulator driver for National Semiconductors LP3971 PMIC chip
 *
 *  Copyright (C) 2009 Samsung Electronics
 *  Author: Marek Szyprowski <m.szyprowski@samsung.com>
 *
 * Based on wm8350.c
 */

#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 const 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 const 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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
0cbdf7bc MS	2	/*
	3	* Regulator driver for National Semiconductors LP3971 PMIC chip
	4	*
	5	* Copyright (C) 2009 Samsung Electronics
	6	* Author: Marek Szyprowski <m.szyprowski@samsung.com>
	7	*
	8	* Based on wm8350.c
0cbdf7bc MS	9	*/
	10
	11	#include <linux/bug.h>
	12	#include <linux/err.h>
	13	#include <linux/i2c.h>
	14	#include <linux/kernel.h>
65602c32	15	#include <linux/module.h>
0cbdf7bc MS	16	#include <linux/regulator/driver.h>
0cbdf7bc MS	17	#include <linux/regulator/lp3971.h>
5a0e3ad6	18	#include <linux/slab.h>
0cbdf7bc MS	19
	20	struct lp3971 {
	21	struct device *dev;
	22	struct mutex io_lock;
	23	struct i2c_client *i2c;
0cbdf7bc MS	24	};
	25
	26	static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
	27	static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);
	28
	29	#define LP3971_SYS_CONTROL1_REG 0x07
	30
	31	/* System control register 1 initial value,
	32	bits 4 and 5 are EPROM programmable */
	33	#define SYS_CONTROL1_INIT_VAL 0x40
	34	#define SYS_CONTROL1_INIT_MASK 0xCF
	35
	36	#define LP3971_BUCK_VOL_ENABLE_REG 0x10
	37	#define LP3971_BUCK_VOL_CHANGE_REG 0x20
	38
	39	/* Voltage control registers shift:
	40	LP3971_BUCK1 -> 0
	41	LP3971_BUCK2 -> 4
	42	LP3971_BUCK3 -> 6
	43	*/
451a73cd	44	#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) \| (x & ~0x01))
0cbdf7bc MS	45	#define BUCK_VOL_CHANGE_FLAG_GO 0x01
	46	#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
	47	#define BUCK_VOL_CHANGE_FLAG_MASK 0x03
	48
	49	#define LP3971_BUCK1_BASE 0x23
	50	#define LP3971_BUCK2_BASE 0x29
	51	#define LP3971_BUCK3_BASE 0x32
	52
6faa7e0a	53	static const int buck_base_addr[] = {
0cbdf7bc MS	54	LP3971_BUCK1_BASE,
	55	LP3971_BUCK2_BASE,
	56	LP3971_BUCK3_BASE,
	57	};
	58
	59	#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
	60	#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)
	61
cad8d76e AL	62	static const unsigned int buck_voltage_map[] = {
	63	0, 800000, 850000, 900000, 950000, 1000000, 1050000, 1100000,
	64	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
	65	1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
	66	3000000, 3300000,
0cbdf7bc MS	67	};
	68
	69	#define BUCK_TARGET_VOL_MASK 0x3f
0cbdf7bc MS	70
	71	#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
	72
	73	#define LP3971_LDO_ENABLE_REG 0x12
	74	#define LP3971_LDO_VOL_CONTR_BASE 0x39
	75
	76	/* Voltage control registers:
	77	LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
	78	LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
	79	LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
	80	LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
	81	LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
	82	*/
	83	#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
	84
	85	/* Voltage control registers shift:
	86	LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
	87	LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
	88	LP3971_LDO5 -> 0
	89	*/
	90	#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
	91	#define LDO_VOL_CONTR_MASK 0x0f
	92
cad8d76e AL	93	static const unsigned int ldo45_voltage_map[] = {
	94	1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
	95	1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
0cbdf7bc MS	96	};
0cbdf7bc MS	97
cad8d76e AL	98	static const unsigned int ldo123_voltage_map[] = {
	99	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
	100	2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
0cbdf7bc MS	101	};
0cbdf7bc MS	102
0cbdf7bc MS	103	#define LDO_VOL_MIN_IDX 0x00
	104	#define LDO_VOL_MAX_IDX 0x0f
	105
0cbdf7bc MS	106	static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
	107	{
	108	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	109	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	110	u16 mask = 1 << (1 + ldo);
	111	u16 val;
	112
	113	val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
	114	return (val & mask) != 0;
	115	}
	116
	117	static int lp3971_ldo_enable(struct regulator_dev *dev)
	118	{
	119	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	120	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	121	u16 mask = 1 << (1 + ldo);
	122
	123	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
	124	}
	125
	126	static int lp3971_ldo_disable(struct regulator_dev *dev)
	127	{
	128	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	129	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	130	u16 mask = 1 << (1 + ldo);
	131
	132	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
	133	}
	134
f38482fa	135	static int lp3971_ldo_get_voltage_sel(struct regulator_dev *dev)
0cbdf7bc MS	136	{
	137	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	138	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	139	u16 val, reg;
	140
	141	reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
	142	val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
	143
f38482fa	144	return val;
0cbdf7bc MS	145	}
0cbdf7bc MS	146
dd8e2314 AL	147	static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	148	unsigned int selector)
0cbdf7bc MS	149	{
	150	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	151	int ldo = rdev_get_id(dev) - LP3971_LDO1;
3a93f2a9	152
0cbdf7bc	153	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
cdb868f5	154	LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
dd8e2314	155	selector << LDO_VOL_CONTR_SHIFT(ldo));
0cbdf7bc MS	156	}
0cbdf7bc MS	157
93b84ea5	158	static const struct regulator_ops lp3971_ldo_ops = {
cad8d76e	159	.list_voltage = regulator_list_voltage_table,
3e655618	160	.map_voltage = regulator_map_voltage_ascend,
0cbdf7bc MS	161	.is_enabled = lp3971_ldo_is_enabled,
	162	.enable = lp3971_ldo_enable,
	163	.disable = lp3971_ldo_disable,
f38482fa	164	.get_voltage_sel = lp3971_ldo_get_voltage_sel,
dd8e2314	165	.set_voltage_sel = lp3971_ldo_set_voltage_sel,
0cbdf7bc MS	166	};
0cbdf7bc MS	167
0cbdf7bc MS	168	static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
	169	{
	170	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	171	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	172	u16 mask = 1 << (buck * 2);
	173	u16 val;
	174
	175	val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
	176	return (val & mask) != 0;
	177	}
	178
	179	static int lp3971_dcdc_enable(struct regulator_dev *dev)
	180	{
	181	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	182	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	183	u16 mask = 1 << (buck * 2);
	184
	185	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
	186	}
	187
	188	static int lp3971_dcdc_disable(struct regulator_dev *dev)
	189	{
	190	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	191	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	192	u16 mask = 1 << (buck * 2);
	193
	194	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
	195	}
	196
f38482fa	197	static int lp3971_dcdc_get_voltage_sel(struct regulator_dev *dev)
0cbdf7bc MS	198	{
	199	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	200	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	201	u16 reg;
0cbdf7bc MS	202
	203	reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
	204	reg &= BUCK_TARGET_VOL_MASK;
	205
f38482fa	206	return reg;
0cbdf7bc MS	207	}
0cbdf7bc MS	208
dd8e2314 AL	209	static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	210	unsigned int selector)
0cbdf7bc MS	211	{
	212	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	213	int buck = rdev_get_id(dev) - LP3971_DCDC1;
0cbdf7bc MS	214	int ret;
0cbdf7bc MS	215
0cbdf7bc	216	ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
dd8e2314	217	BUCK_TARGET_VOL_MASK, selector);
0cbdf7bc MS	218	if (ret)
	219	return ret;
	220
	221	ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	222	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	223	BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
	224	if (ret)
	225	return ret;
	226
	227	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	228	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	229	0 << BUCK_VOL_CHANGE_SHIFT(buck));
	230	}
	231
93b84ea5	232	static const struct regulator_ops lp3971_dcdc_ops = {
cad8d76e	233	.list_voltage = regulator_list_voltage_table,
3e655618	234	.map_voltage = regulator_map_voltage_ascend,
0cbdf7bc MS	235	.is_enabled = lp3971_dcdc_is_enabled,
	236	.enable = lp3971_dcdc_enable,
	237	.disable = lp3971_dcdc_disable,
f38482fa	238	.get_voltage_sel = lp3971_dcdc_get_voltage_sel,
dd8e2314	239	.set_voltage_sel = lp3971_dcdc_set_voltage_sel,
0cbdf7bc MS	240	};
0cbdf7bc MS	241
14add4ff	242	static const struct regulator_desc regulators[] = {
0cbdf7bc MS	243	{
	244	.name = "LDO1",
	245	.id = LP3971_LDO1,
	246	.ops = &lp3971_ldo_ops,
	247	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	248	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	249	.type = REGULATOR_VOLTAGE,
	250	.owner = THIS_MODULE,
	251	},
	252	{
	253	.name = "LDO2",
	254	.id = LP3971_LDO2,
	255	.ops = &lp3971_ldo_ops,
	256	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	257	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	258	.type = REGULATOR_VOLTAGE,
	259	.owner = THIS_MODULE,
	260	},
	261	{
	262	.name = "LDO3",
	263	.id = LP3971_LDO3,
	264	.ops = &lp3971_ldo_ops,
	265	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	266	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	267	.type = REGULATOR_VOLTAGE,
	268	.owner = THIS_MODULE,
	269	},
	270	{
	271	.name = "LDO4",
	272	.id = LP3971_LDO4,
	273	.ops = &lp3971_ldo_ops,
	274	.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
cad8d76e	275	.volt_table = ldo45_voltage_map,
0cbdf7bc MS	276	.type = REGULATOR_VOLTAGE,
	277	.owner = THIS_MODULE,
	278	},
	279	{
	280	.name = "LDO5",
	281	.id = LP3971_LDO5,
	282	.ops = &lp3971_ldo_ops,
	283	.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
cad8d76e	284	.volt_table = ldo45_voltage_map,
0cbdf7bc MS	285	.type = REGULATOR_VOLTAGE,
	286	.owner = THIS_MODULE,
	287	},
	288	{
	289	.name = "DCDC1",
	290	.id = LP3971_DCDC1,
	291	.ops = &lp3971_dcdc_ops,
	292	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	293	.volt_table = buck_voltage_map,
0cbdf7bc MS	294	.type = REGULATOR_VOLTAGE,
	295	.owner = THIS_MODULE,
	296	},
	297	{
	298	.name = "DCDC2",
	299	.id = LP3971_DCDC2,
	300	.ops = &lp3971_dcdc_ops,
	301	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	302	.volt_table = buck_voltage_map,
0cbdf7bc MS	303	.type = REGULATOR_VOLTAGE,
	304	.owner = THIS_MODULE,
	305	},
	306	{
	307	.name = "DCDC3",
	308	.id = LP3971_DCDC3,
	309	.ops = &lp3971_dcdc_ops,
	310	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	311	.volt_table = buck_voltage_map,
0cbdf7bc MS	312	.type = REGULATOR_VOLTAGE,
	313	.owner = THIS_MODULE,
	314	},
	315	};
	316
	317	static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
	318	u16 *dest)
	319	{
	320	int ret;
	321
	322	if (count != 1)
	323	return -EIO;
	324	ret = i2c_smbus_read_byte_data(i2c, reg);
27ef7f00	325	if (ret < 0)
a1985d46	326	return ret;
0cbdf7bc MS	327
	328	*dest = ret;
	329	return 0;
	330	}
	331
	332	static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
	333	const u16 *src)
	334	{
0cbdf7bc MS	335	if (count != 1)
0cbdf7bc MS	336	return -EIO;
1bddc2f5	337	return i2c_smbus_write_byte_data(i2c, reg, *src);
0cbdf7bc MS	338	}
	339
	340	static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
	341	{
	342	u16 val = 0;
	343
	344	mutex_lock(&lp3971->io_lock);
	345
	346	lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
	347
	348	dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
	349	(unsigned)val&0xff);
	350
	351	mutex_unlock(&lp3971->io_lock);
	352
	353	return val & 0xff;
	354	}
	355
	356	static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
	357	{
	358	u16 tmp;
	359	int ret;
	360
	361	mutex_lock(&lp3971->io_lock);
	362
	363	ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
0cbdf7bc	364	if (ret == 0) {
40e1d79e	365	tmp = (tmp & ~mask) \| val;
0cbdf7bc MS	366	ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
	367	dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
	368	(unsigned)val&0xff);
	369	}
	370	mutex_unlock(&lp3971->io_lock);
	371
	372	return ret;
	373	}
	374
a5023574	375	static int setup_regulators(struct lp3971 *lp3971,
ebbed04f	376	struct lp3971_platform_data *pdata)
0cbdf7bc MS	377	{
0cbdf7bc MS	378	int i, err;
ebbed04f	379
0cbdf7bc	380	/* Instantiate the regulators */
ebbed04f	381	for (i = 0; i < pdata->num_regulators; i++) {
c172708d	382	struct regulator_config config = { };
ebbed04f	383	struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
56dde80a	384	struct regulator_dev *rdev;
0cbdf7bc	385
c172708d MB	386	config.dev = lp3971->dev;
	387	config.init_data = reg->initdata;
	388	config.driver_data = lp3971;
	389
56dde80a AL	390	rdev = devm_regulator_register(lp3971->dev,
	391	&regulators[reg->id], &config);
	392	if (IS_ERR(rdev)) {
	393	err = PTR_ERR(rdev);
0cbdf7bc MS	394	dev_err(lp3971->dev, "regulator init failed: %d\n",
0cbdf7bc MS	395	err);
56dde80a	396	return err;
0cbdf7bc MS	397	}
	398	}
	399
	400	return 0;
0cbdf7bc MS	401	}
0cbdf7bc MS	402
a5023574	403	static int lp3971_i2c_probe(struct i2c_client *i2c,
0cbdf7bc MS	404	const struct i2c_device_id *id)
	405	{
	406	struct lp3971 *lp3971;
dff91d0b	407	struct lp3971_platform_data *pdata = dev_get_platdata(&i2c->dev);
0cbdf7bc MS	408	int ret;
	409	u16 val;
	410
ebbed04f DT	411	if (!pdata) {
	412	dev_dbg(&i2c->dev, "No platform init data supplied\n");
	413	return -ENODEV;
0cbdf7bc MS	414	}
0cbdf7bc MS	415
2af0af67	416	lp3971 = devm_kzalloc(&i2c->dev, sizeof(struct lp3971), GFP_KERNEL);
ebbed04f DT	417	if (lp3971 == NULL)
	418	return -ENOMEM;
	419
0cbdf7bc MS	420	lp3971->i2c = i2c;
0cbdf7bc MS	421	lp3971->dev = &i2c->dev;
0cbdf7bc MS	422
	423	mutex_init(&lp3971->io_lock);
	424
	425	/* Detect LP3971 */
	426	ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
	427	if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
	428	ret = -ENODEV;
	429	if (ret < 0) {
	430	dev_err(&i2c->dev, "failed to detect device\n");
2af0af67	431	return ret;
0cbdf7bc MS	432	}
0cbdf7bc MS	433
ebbed04f DT	434	ret = setup_regulators(lp3971, pdata);
ebbed04f DT	435	if (ret < 0)
2af0af67	436	return ret;
0cbdf7bc	437
ebbed04f	438	i2c_set_clientdata(i2c, lp3971);
0cbdf7bc	439	return 0;
0cbdf7bc MS	440	}
0cbdf7bc MS	441
0cbdf7bc	442	static const struct i2c_device_id lp3971_i2c_id[] = {
0a3ee93a JH	443	{ "lp3971", 0 },
0a3ee93a JH	444	{ }
0cbdf7bc MS	445	};
	446	MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
	447
	448	static struct i2c_driver lp3971_i2c_driver = {
	449	.driver = {
	450	.name = "LP3971",
0cbdf7bc MS	451	},
0cbdf7bc MS	452	.probe = lp3971_i2c_probe,
0cbdf7bc MS	453	.id_table = lp3971_i2c_id,
	454	};
	455
5af34e60	456	module_i2c_driver(lp3971_i2c_driver);
0cbdf7bc MS	457
	458	MODULE_LICENSE("GPL");
	459	MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
	460	MODULE_DESCRIPTION("LP3971 PMIC driver");