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linux/drivers/regulator/lp3971.c
Axel Lin f38482fa70 regulator: lp3971: Convert to get_voltage_sel 
regulator_list_voltage_table() returns -EINVAL if selector >= n_voltages.
Thus we don't need to check if reg is greater than BUCK_TARGET_VOL_MAX_IDX in
lp3971_dcdc_get_voltage_sel.

BUCK_TARGET_VOL_MIN_IDX and BUCK_TARGET_VOL_MAX_IDX are not used, remove them.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-12-24 16:26:50 +00:00

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/*
* 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");
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