[GitHub/mt8127/android_kernel_alcatel_ttab.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 BUCK_TARGET_VOL_MIN_IDX 0x01
#define BUCK_TARGET_VOL_MAX_IDX 0x19

#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(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 dev->desc->volt_table[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 = lp3971_ldo_get_voltage,
	.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(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 reg;
	int val;

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

	if (reg <= BUCK_TARGET_VOL_MAX_IDX)
		val = buck_voltage_map[reg];
	else {
		val = 0;
		dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
	}

	return val;
}

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 = lp3971_dcdc_get_voltage,
	.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 __devinit 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 __devinit 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 __devexit 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
	76	#define BUCK_TARGET_VOL_MIN_IDX 0x01
	77	#define BUCK_TARGET_VOL_MAX_IDX 0x19
	78
	79	#define LP3971_BUCK_RAMP_REG(x) (buck_base_addr[x]+2)
	80
	81	#define LP3971_LDO_ENABLE_REG 0x12
	82	#define LP3971_LDO_VOL_CONTR_BASE 0x39
	83
	84	/* Voltage control registers:
	85	LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
	86	LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
	87	LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
	88	LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
	89	LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
	90	*/
	91	#define LP3971_LDO_VOL_CONTR_REG(x) (LP3971_LDO_VOL_CONTR_BASE + (x >> 1))
	92
	93	/* Voltage control registers shift:
	94	LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
	95	LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
	96	LP3971_LDO5 -> 0
	97	*/
	98	#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
	99	#define LDO_VOL_CONTR_MASK 0x0f
	100
cad8d76e AL	101	static const unsigned int ldo45_voltage_map[] = {
	102	1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
	103	1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
0cbdf7bc MS	104	};
0cbdf7bc MS	105
cad8d76e AL	106	static const unsigned int ldo123_voltage_map[] = {
	107	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
	108	2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
0cbdf7bc MS	109	};
0cbdf7bc MS	110
0cbdf7bc MS	111	#define LDO_VOL_MIN_IDX 0x00
	112	#define LDO_VOL_MAX_IDX 0x0f
	113
0cbdf7bc MS	114	static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
	115	{
	116	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	117	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	118	u16 mask = 1 << (1 + ldo);
	119	u16 val;
	120
	121	val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
	122	return (val & mask) != 0;
	123	}
	124
	125	static int lp3971_ldo_enable(struct regulator_dev *dev)
	126	{
	127	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	128	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	129	u16 mask = 1 << (1 + ldo);
	130
	131	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
	132	}
	133
	134	static int lp3971_ldo_disable(struct regulator_dev *dev)
	135	{
	136	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	137	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	138	u16 mask = 1 << (1 + ldo);
	139
	140	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
	141	}
	142
	143	static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
	144	{
	145	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	146	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	147	u16 val, reg;
	148
	149	reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
	150	val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;
	151
cad8d76e	152	return dev->desc->volt_table[val];
0cbdf7bc MS	153	}
0cbdf7bc MS	154
dd8e2314 AL	155	static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	156	unsigned int selector)
0cbdf7bc MS	157	{
	158	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	159	int ldo = rdev_get_id(dev) - LP3971_LDO1;
3a93f2a9	160
0cbdf7bc	161	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
cdb868f5	162	LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
dd8e2314	163	selector << LDO_VOL_CONTR_SHIFT(ldo));
0cbdf7bc MS	164	}
	165
	166	static struct regulator_ops lp3971_ldo_ops = {
cad8d76e	167	.list_voltage = regulator_list_voltage_table,
0cbdf7bc MS	168	.is_enabled = lp3971_ldo_is_enabled,
	169	.enable = lp3971_ldo_enable,
	170	.disable = lp3971_ldo_disable,
	171	.get_voltage = lp3971_ldo_get_voltage,
dd8e2314	172	.set_voltage_sel = lp3971_ldo_set_voltage_sel,
0cbdf7bc MS	173	};
0cbdf7bc MS	174
0cbdf7bc MS	175	static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
	176	{
	177	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	178	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	179	u16 mask = 1 << (buck * 2);
	180	u16 val;
	181
	182	val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
	183	return (val & mask) != 0;
	184	}
	185
	186	static int lp3971_dcdc_enable(struct regulator_dev *dev)
	187	{
	188	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	189	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	190	u16 mask = 1 << (buck * 2);
	191
	192	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
	193	}
	194
	195	static int lp3971_dcdc_disable(struct regulator_dev *dev)
	196	{
	197	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	198	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	199	u16 mask = 1 << (buck * 2);
	200
	201	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
	202	}
	203
	204	static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
	205	{
	206	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	207	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	208	u16 reg;
	209	int val;
	210
	211	reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
	212	reg &= BUCK_TARGET_VOL_MASK;
	213
	214	if (reg <= BUCK_TARGET_VOL_MAX_IDX)
cad8d76e	215	val = buck_voltage_map[reg];
0cbdf7bc MS	216	else {
	217	val = 0;
	218	dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
	219	}
	220
	221	return val;
	222	}
	223
dd8e2314 AL	224	static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
dd8e2314 AL	225	unsigned int selector)
0cbdf7bc MS	226	{
	227	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	228	int buck = rdev_get_id(dev) - LP3971_DCDC1;
0cbdf7bc MS	229	int ret;
0cbdf7bc MS	230
0cbdf7bc	231	ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
dd8e2314	232	BUCK_TARGET_VOL_MASK, selector);
0cbdf7bc MS	233	if (ret)
	234	return ret;
	235
	236	ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	237	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	238	BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
	239	if (ret)
	240	return ret;
	241
	242	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	243	BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	244	0 << BUCK_VOL_CHANGE_SHIFT(buck));
	245	}
	246
	247	static struct regulator_ops lp3971_dcdc_ops = {
cad8d76e	248	.list_voltage = regulator_list_voltage_table,
0cbdf7bc MS	249	.is_enabled = lp3971_dcdc_is_enabled,
	250	.enable = lp3971_dcdc_enable,
	251	.disable = lp3971_dcdc_disable,
	252	.get_voltage = lp3971_dcdc_get_voltage,
dd8e2314	253	.set_voltage_sel = lp3971_dcdc_set_voltage_sel,
0cbdf7bc MS	254	};
0cbdf7bc MS	255
14add4ff	256	static const struct regulator_desc regulators[] = {
0cbdf7bc MS	257	{
	258	.name = "LDO1",
	259	.id = LP3971_LDO1,
	260	.ops = &lp3971_ldo_ops,
	261	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	262	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	263	.type = REGULATOR_VOLTAGE,
	264	.owner = THIS_MODULE,
	265	},
	266	{
	267	.name = "LDO2",
	268	.id = LP3971_LDO2,
	269	.ops = &lp3971_ldo_ops,
	270	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	271	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	272	.type = REGULATOR_VOLTAGE,
	273	.owner = THIS_MODULE,
	274	},
	275	{
	276	.name = "LDO3",
	277	.id = LP3971_LDO3,
	278	.ops = &lp3971_ldo_ops,
	279	.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
cad8d76e	280	.volt_table = ldo123_voltage_map,
0cbdf7bc MS	281	.type = REGULATOR_VOLTAGE,
	282	.owner = THIS_MODULE,
	283	},
	284	{
	285	.name = "LDO4",
	286	.id = LP3971_LDO4,
	287	.ops = &lp3971_ldo_ops,
	288	.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
cad8d76e	289	.volt_table = ldo45_voltage_map,
0cbdf7bc MS	290	.type = REGULATOR_VOLTAGE,
	291	.owner = THIS_MODULE,
	292	},
	293	{
	294	.name = "LDO5",
	295	.id = LP3971_LDO5,
	296	.ops = &lp3971_ldo_ops,
	297	.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
cad8d76e	298	.volt_table = ldo45_voltage_map,
0cbdf7bc MS	299	.type = REGULATOR_VOLTAGE,
	300	.owner = THIS_MODULE,
	301	},
	302	{
	303	.name = "DCDC1",
	304	.id = LP3971_DCDC1,
	305	.ops = &lp3971_dcdc_ops,
	306	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	307	.volt_table = buck_voltage_map,
0cbdf7bc MS	308	.type = REGULATOR_VOLTAGE,
	309	.owner = THIS_MODULE,
	310	},
	311	{
	312	.name = "DCDC2",
	313	.id = LP3971_DCDC2,
	314	.ops = &lp3971_dcdc_ops,
	315	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	316	.volt_table = buck_voltage_map,
0cbdf7bc MS	317	.type = REGULATOR_VOLTAGE,
	318	.owner = THIS_MODULE,
	319	},
	320	{
	321	.name = "DCDC3",
	322	.id = LP3971_DCDC3,
	323	.ops = &lp3971_dcdc_ops,
	324	.n_voltages = ARRAY_SIZE(buck_voltage_map),
cad8d76e	325	.volt_table = buck_voltage_map,
0cbdf7bc MS	326	.type = REGULATOR_VOLTAGE,
	327	.owner = THIS_MODULE,
	328	},
	329	};
	330
	331	static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
	332	u16 *dest)
	333	{
	334	int ret;
	335
	336	if (count != 1)
	337	return -EIO;
	338	ret = i2c_smbus_read_byte_data(i2c, reg);
27ef7f00	339	if (ret < 0)
0cbdf7bc MS	340	return -EIO;
	341
	342	*dest = ret;
	343	return 0;
	344	}
	345
	346	static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
	347	const u16 *src)
	348	{
0cbdf7bc MS	349	if (count != 1)
0cbdf7bc MS	350	return -EIO;
1bddc2f5	351	return i2c_smbus_write_byte_data(i2c, reg, *src);
0cbdf7bc MS	352	}
	353
	354	static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
	355	{
	356	u16 val = 0;
	357
	358	mutex_lock(&lp3971->io_lock);
	359
	360	lp3971_i2c_read(lp3971->i2c, reg, 1, &val);
	361
	362	dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
	363	(unsigned)val&0xff);
	364
	365	mutex_unlock(&lp3971->io_lock);
	366
	367	return val & 0xff;
	368	}
	369
	370	static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
	371	{
	372	u16 tmp;
	373	int ret;
	374
	375	mutex_lock(&lp3971->io_lock);
	376
	377	ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
	378	tmp = (tmp & ~mask) \| val;
	379	if (ret == 0) {
	380	ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
	381	dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
	382	(unsigned)val&0xff);
	383	}
	384	mutex_unlock(&lp3971->io_lock);
	385
	386	return ret;
	387	}
	388
ebbed04f DT	389	static int __devinit setup_regulators(struct lp3971 *lp3971,
ebbed04f DT	390	struct lp3971_platform_data *pdata)
0cbdf7bc MS	391	{
0cbdf7bc MS	392	int i, err;
ebbed04f DT	393
	394	lp3971->num_regulators = pdata->num_regulators;
	395	lp3971->rdev = kcalloc(pdata->num_regulators,
	396	sizeof(struct regulator_dev *), GFP_KERNEL);
67e46f34 DC	397	if (!lp3971->rdev) {
	398	err = -ENOMEM;
	399	goto err_nomem;
	400	}
0cbdf7bc MS	401
0cbdf7bc MS	402	/* Instantiate the regulators */
ebbed04f	403	for (i = 0; i < pdata->num_regulators; i++) {
c172708d	404	struct regulator_config config = { };
ebbed04f	405	struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
0cbdf7bc	406
c172708d MB	407	config.dev = lp3971->dev;
	408	config.init_data = reg->initdata;
	409	config.driver_data = lp3971;
	410
	411	lp3971->rdev[i] = regulator_register(&regulators[reg->id],
	412	&config);
d662fc82 JL	413	if (IS_ERR(lp3971->rdev[i])) {
d662fc82 JL	414	err = PTR_ERR(lp3971->rdev[i]);
0cbdf7bc MS	415	dev_err(lp3971->dev, "regulator init failed: %d\n",
	416	err);
	417	goto error;
	418	}
	419	}
	420
	421	return 0;
ebbed04f	422
0cbdf7bc	423	error:
ebbed04f DT	424	while (--i >= 0)
ebbed04f DT	425	regulator_unregister(lp3971->rdev[i]);
0cbdf7bc MS	426	kfree(lp3971->rdev);
0cbdf7bc MS	427	lp3971->rdev = NULL;
67e46f34	428	err_nomem:
0cbdf7bc MS	429	return err;
	430	}
	431
	432	static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
	433	const struct i2c_device_id *id)
	434	{
	435	struct lp3971 *lp3971;
	436	struct lp3971_platform_data *pdata = i2c->dev.platform_data;
	437	int ret;
	438	u16 val;
	439
ebbed04f DT	440	if (!pdata) {
	441	dev_dbg(&i2c->dev, "No platform init data supplied\n");
	442	return -ENODEV;
0cbdf7bc MS	443	}
0cbdf7bc MS	444
ebbed04f DT	445	lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
	446	if (lp3971 == NULL)
	447	return -ENOMEM;
	448
0cbdf7bc MS	449	lp3971->i2c = i2c;
0cbdf7bc MS	450	lp3971->dev = &i2c->dev;
0cbdf7bc MS	451
	452	mutex_init(&lp3971->io_lock);
	453
	454	/* Detect LP3971 */
	455	ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
	456	if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
	457	ret = -ENODEV;
	458	if (ret < 0) {
	459	dev_err(&i2c->dev, "failed to detect device\n");
	460	goto err_detect;
	461	}
	462
ebbed04f DT	463	ret = setup_regulators(lp3971, pdata);
	464	if (ret < 0)
	465	goto err_detect;
0cbdf7bc	466
ebbed04f	467	i2c_set_clientdata(i2c, lp3971);
0cbdf7bc MS	468	return 0;
	469
	470	err_detect:
0cbdf7bc	471	kfree(lp3971);
0cbdf7bc MS	472	return ret;
	473	}
	474
	475	static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
	476	{
	477	struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
	478	int i;
ebbed04f	479
0cbdf7bc	480	for (i = 0; i < lp3971->num_regulators; i++)
ebbed04f DT	481	regulator_unregister(lp3971->rdev[i]);
ebbed04f DT	482
0cbdf7bc	483	kfree(lp3971->rdev);
0cbdf7bc MS	484	kfree(lp3971);
	485
	486	return 0;
	487	}
	488
	489	static const struct i2c_device_id lp3971_i2c_id[] = {
	490	{ "lp3971", 0 },
	491	{ }
	492	};
	493	MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);
	494
	495	static struct i2c_driver lp3971_i2c_driver = {
	496	.driver = {
	497	.name = "LP3971",
	498	.owner = THIS_MODULE,
	499	},
	500	.probe = lp3971_i2c_probe,
5eb9f2b9	501	.remove = lp3971_i2c_remove,
0cbdf7bc MS	502	.id_table = lp3971_i2c_id,
	503	};
	504
5af34e60	505	module_i2c_driver(lp3971_i2c_driver);
0cbdf7bc MS	506
	507	MODULE_LICENSE("GPL");
	508	MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
	509	MODULE_DESCRIPTION("LP3971 PMIC driver");