mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
40e1d79ee1
This is harmless but if lp3971_i2c_read() fails then "tmp" can be uninitialized. Silence the warning by moving the error handling up a line. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Mark Brown <broonie@kernel.org>
465 lines
12 KiB
C
465 lines
12 KiB
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,
|
|
®ulators[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");
|