mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-14 15:54:15 +08:00
LP3971 PMIC regulator driver (updated and combined version)
This patch adds regulator drivers for National Semiconductors LP3971 PMIC. This LP3971 PMIC controller has 3 DC/DC voltage converters and 5 low drop-out (LDO) regulators. LP3971 PMIC controller uses I2C interface. Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Marek Szyprowski
Liam Girdwood
parent
1909e2f658
commit
0cbdf7bce5
@ -110,4 +110,11 @@ config REGULATOR_PCF50633
|
||||
Say Y here to support the voltage regulators and convertors
|
||||
on PCF50633
|
||||
|
||||
config REGULATOR_LP3971
|
||||
tristate "National Semiconductors LP3971 PMIC regulator driver"
|
||||
depends on I2C
|
||||
help
|
||||
Say Y here to support the voltage regulators and convertors
|
||||
on National Semiconductors LP3971 PMIC
|
||||
|
||||
endif
|
||||
|
||||
@ -9,6 +9,7 @@ obj-$(CONFIG_REGULATOR_VIRTUAL_CONSUMER) += virtual.o
|
||||
obj-$(CONFIG_REGULATOR_USERSPACE_CONSUMER) += userspace-consumer.o
|
||||
|
||||
obj-$(CONFIG_REGULATOR_BQ24022) += bq24022.o
|
||||
obj-$(CONFIG_REGULATOR_LP3971) += lp3971.o
|
||||
obj-$(CONFIG_REGULATOR_MAX1586) += max1586.o
|
||||
obj-$(CONFIG_REGULATOR_TWL4030) += twl4030-regulator.o
|
||||
obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
|
||||
|
||||
562
drivers/regulator/lp3971.c
Normal file
562
drivers/regulator/lp3971.c
Normal file
@ -0,0 +1,562 @@
|
||||
/*
|
||||
* 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/regulator/driver.h>
|
||||
#include <linux/regulator/lp3971.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) (((1 << x) & ~0x01) << 1)
|
||||
#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
|
||||
|
||||
const static 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)
|
||||
|
||||
const static int buck_voltage_map[] = {
|
||||
0, 800, 850, 900, 950, 1000, 1050, 1100,
|
||||
1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500,
|
||||
1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800,
|
||||
3000, 3300,
|
||||
};
|
||||
|
||||
#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
|
||||
|
||||
const static int ldo45_voltage_map[] = {
|
||||
1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
|
||||
1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
|
||||
};
|
||||
|
||||
const static int ldo123_voltage_map[] = {
|
||||
1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
|
||||
2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
|
||||
};
|
||||
|
||||
const static int *ldo_voltage_map[] = {
|
||||
ldo123_voltage_map, /* LDO1 */
|
||||
ldo123_voltage_map, /* LDO2 */
|
||||
ldo123_voltage_map, /* LDO3 */
|
||||
ldo45_voltage_map, /* LDO4 */
|
||||
ldo45_voltage_map, /* LDO5 */
|
||||
};
|
||||
|
||||
#define LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[(x - LP3971_LDO1)])
|
||||
|
||||
#define LDO_VOL_MIN_IDX 0x00
|
||||
#define LDO_VOL_MAX_IDX 0x0f
|
||||
|
||||
static int lp3971_ldo_list_voltage(struct regulator_dev *dev, unsigned index)
|
||||
{
|
||||
int ldo = rdev_get_id(dev) - LP3971_LDO1;
|
||||
return 1000 * LDO_VOL_VALUE_MAP(ldo)[index];
|
||||
}
|
||||
|
||||
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 1000 * LDO_VOL_VALUE_MAP(ldo)[val];
|
||||
}
|
||||
|
||||
static int lp3971_ldo_set_voltage(struct regulator_dev *dev,
|
||||
int min_uV, int max_uV)
|
||||
{
|
||||
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
|
||||
int ldo = rdev_get_id(dev) - LP3971_LDO1;
|
||||
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
|
||||
const int *vol_map = LDO_VOL_VALUE_MAP(ldo);
|
||||
u16 val;
|
||||
|
||||
if (min_vol < vol_map[LDO_VOL_MIN_IDX] ||
|
||||
min_vol > vol_map[LDO_VOL_MAX_IDX])
|
||||
return -EINVAL;
|
||||
|
||||
for (val = LDO_VOL_MIN_IDX; val <= LDO_VOL_MAX_IDX; val++)
|
||||
if (vol_map[val] >= min_vol)
|
||||
break;
|
||||
|
||||
if (vol_map[val] > max_vol)
|
||||
return -EINVAL;
|
||||
|
||||
return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
|
||||
LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo), val);
|
||||
}
|
||||
|
||||
static struct regulator_ops lp3971_ldo_ops = {
|
||||
.list_voltage = lp3971_ldo_list_voltage,
|
||||
.is_enabled = lp3971_ldo_is_enabled,
|
||||
.enable = lp3971_ldo_enable,
|
||||
.disable = lp3971_ldo_disable,
|
||||
.get_voltage = lp3971_ldo_get_voltage,
|
||||
.set_voltage = lp3971_ldo_set_voltage,
|
||||
};
|
||||
|
||||
static int lp3971_dcdc_list_voltage(struct regulator_dev *dev, unsigned index)
|
||||
{
|
||||
return 1000 * buck_voltage_map[index];
|
||||
}
|
||||
|
||||
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 = 1000 * 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(struct regulator_dev *dev,
|
||||
int min_uV, int max_uV)
|
||||
{
|
||||
struct lp3971 *lp3971 = rdev_get_drvdata(dev);
|
||||
int buck = rdev_get_id(dev) - LP3971_DCDC1;
|
||||
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
|
||||
const int *vol_map = buck_voltage_map;
|
||||
u16 val;
|
||||
int ret;
|
||||
|
||||
if (min_vol < vol_map[BUCK_TARGET_VOL_MIN_IDX] ||
|
||||
min_vol > vol_map[BUCK_TARGET_VOL_MAX_IDX])
|
||||
return -EINVAL;
|
||||
|
||||
for (val = BUCK_TARGET_VOL_MIN_IDX; val <= BUCK_TARGET_VOL_MAX_IDX;
|
||||
val++)
|
||||
if (vol_map[val] >= min_vol)
|
||||
break;
|
||||
|
||||
if (vol_map[val] > max_vol)
|
||||
return -EINVAL;
|
||||
|
||||
ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
|
||||
BUCK_TARGET_VOL_MASK, val);
|
||||
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 = lp3971_dcdc_list_voltage,
|
||||
.is_enabled = lp3971_dcdc_is_enabled,
|
||||
.enable = lp3971_dcdc_enable,
|
||||
.disable = lp3971_dcdc_disable,
|
||||
.get_voltage = lp3971_dcdc_get_voltage,
|
||||
.set_voltage = lp3971_dcdc_set_voltage,
|
||||
};
|
||||
|
||||
static struct regulator_desc regulators[] = {
|
||||
{
|
||||
.name = "LDO1",
|
||||
.id = LP3971_LDO1,
|
||||
.ops = &lp3971_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(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),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "LDO3",
|
||||
.id = LP3971_LDO3,
|
||||
.ops = &lp3971_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(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),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "LDO5",
|
||||
.id = LP3971_LDO5,
|
||||
.ops = &lp3971_ldo_ops,
|
||||
.n_voltages = ARRAY_SIZE(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),
|
||||
.type = REGULATOR_VOLTAGE,
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
{
|
||||
.name = "DCDC2",
|
||||
.id = LP3971_DCDC2,
|
||||
.ops = &lp3971_dcdc_ops,
|
||||
.n_voltages = ARRAY_SIZE(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),
|
||||
.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 || count != 1)
|
||||
return -EIO;
|
||||
|
||||
*dest = ret;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
|
||||
const u16 *src)
|
||||
{
|
||||
int ret;
|
||||
|
||||
if (count != 1)
|
||||
return -EIO;
|
||||
ret = i2c_smbus_write_byte_data(i2c, reg, *src);
|
||||
if (ret >= 0)
|
||||
return 0;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
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;
|
||||
int num_regulators = pdata->num_regulators;
|
||||
lp3971->num_regulators = num_regulators;
|
||||
lp3971->rdev = kzalloc(sizeof(struct regulator_dev *) * num_regulators,
|
||||
GFP_KERNEL);
|
||||
|
||||
/* Instantiate the regulators */
|
||||
for (i = 0; i < num_regulators; i++) {
|
||||
int id = pdata->regulators[i].id;
|
||||
lp3971->rdev[i] = regulator_register(®ulators[id],
|
||||
lp3971->dev, pdata->regulators[i].initdata, lp3971);
|
||||
|
||||
err = IS_ERR(lp3971->rdev[i]);
|
||||
if (err) {
|
||||
dev_err(lp3971->dev, "regulator init failed: %d\n",
|
||||
err);
|
||||
goto error;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
error:
|
||||
for (i = 0; i < num_regulators; i++)
|
||||
if (lp3971->rdev[i])
|
||||
regulator_unregister(lp3971->rdev[i]);
|
||||
kfree(lp3971->rdev);
|
||||
lp3971->rdev = NULL;
|
||||
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;
|
||||
|
||||
lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
|
||||
if (lp3971 == NULL) {
|
||||
ret = -ENOMEM;
|
||||
goto err;
|
||||
}
|
||||
|
||||
lp3971->i2c = i2c;
|
||||
lp3971->dev = &i2c->dev;
|
||||
i2c_set_clientdata(i2c, lp3971);
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
if (pdata) {
|
||||
ret = setup_regulators(lp3971, pdata);
|
||||
if (ret < 0)
|
||||
goto err_detect;
|
||||
} else
|
||||
dev_warn(lp3971->dev, "No platform init data supplied\n");
|
||||
|
||||
return 0;
|
||||
|
||||
err_detect:
|
||||
i2c_set_clientdata(i2c, NULL);
|
||||
kfree(lp3971);
|
||||
err:
|
||||
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++)
|
||||
if (lp3971->rdev[i])
|
||||
regulator_unregister(lp3971->rdev[i]);
|
||||
kfree(lp3971->rdev);
|
||||
i2c_set_clientdata(i2c, NULL);
|
||||
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,
|
||||
};
|
||||
|
||||
static int __init lp3971_module_init(void)
|
||||
{
|
||||
int ret = -ENODEV;
|
||||
|
||||
ret = i2c_add_driver(&lp3971_i2c_driver);
|
||||
if (ret != 0)
|
||||
pr_err("Failed to register I2C driver: %d\n", ret);
|
||||
|
||||
return ret;
|
||||
}
|
||||
module_init(lp3971_module_init);
|
||||
|
||||
static void __exit lp3971_module_exit(void)
|
||||
{
|
||||
i2c_del_driver(&lp3971_i2c_driver);
|
||||
}
|
||||
module_exit(lp3971_module_exit);
|
||||
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
|
||||
MODULE_DESCRIPTION("LP3971 PMIC driver");
|
||||
51
include/linux/regulator/lp3971.h
Normal file
51
include/linux/regulator/lp3971.h
Normal file
@ -0,0 +1,51 @@
|
||||
/*
|
||||
* National Semiconductors LP3971 PMIC chip client interface
|
||||
*
|
||||
* Copyright (C) 2009 Samsung Electronics
|
||||
* Author: Marek Szyprowski <m.szyprowski@samsung.com>
|
||||
*
|
||||
* Based on wm8400.h
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation; either version 2 of the License, or
|
||||
* (at your option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#ifndef __LINUX_REGULATOR_LP3971_H
|
||||
#define __LINUX_REGULATOR_LP3971_H
|
||||
|
||||
#include <linux/regulator/machine.h>
|
||||
|
||||
#define LP3971_LDO1 0
|
||||
#define LP3971_LDO2 1
|
||||
#define LP3971_LDO3 2
|
||||
#define LP3971_LDO4 3
|
||||
#define LP3971_LDO5 4
|
||||
|
||||
#define LP3971_DCDC1 5
|
||||
#define LP3971_DCDC2 6
|
||||
#define LP3971_DCDC3 7
|
||||
|
||||
#define LP3971_NUM_REGULATORS 8
|
||||
|
||||
struct lp3971_regulator_subdev {
|
||||
int id;
|
||||
struct regulator_init_data *initdata;
|
||||
};
|
||||
|
||||
struct lp3971_platform_data {
|
||||
int num_regulators;
|
||||
struct lp3971_regulator_subdev *regulators;
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user