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linux_dsm_epyc7002/drivers/regulator/lp3972.c
Dan Carpenter 7cb7348f75 regulator: lp3972: Silence uninitialized variable warning 
This is harmless but my static checker complains that "tmp" is
uninitialized if lp3972_i2c_read() fails.  I have moved the line of code
below the error handling to silence the warning.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-04-14 14:46:19 +01:00

573 lines
14 KiB
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/*
* Regulator driver for National Semiconductors LP3972 PMIC chip
*
* Based on lp3971.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/module.h>
#include <linux/kernel.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/lp3972.h>
#include <linux/slab.h>
struct lp3972 {
struct device *dev;
struct mutex io_lock;
struct i2c_client *i2c;
};
/* LP3972 Control Registers */
#define LP3972_SCR_REG 0x07
#define LP3972_OVER1_REG 0x10
#define LP3972_OVSR1_REG 0x11
#define LP3972_OVER2_REG 0x12
#define LP3972_OVSR2_REG 0x13
#define LP3972_VCC1_REG 0x20
#define LP3972_ADTV1_REG 0x23
#define LP3972_ADTV2_REG 0x24
#define LP3972_AVRC_REG 0x25
#define LP3972_CDTC1_REG 0x26
#define LP3972_CDTC2_REG 0x27
#define LP3972_SDTV1_REG 0x29
#define LP3972_SDTV2_REG 0x2A
#define LP3972_MDTV1_REG 0x32
#define LP3972_MDTV2_REG 0x33
#define LP3972_L2VCR_REG 0x39
#define LP3972_L34VCR_REG 0x3A
#define LP3972_SCR1_REG 0x80
#define LP3972_SCR2_REG 0x81
#define LP3972_OEN3_REG 0x82
#define LP3972_OSR3_REG 0x83
#define LP3972_LOER4_REG 0x84
#define LP3972_B2TV_REG 0x85
#define LP3972_B3TV_REG 0x86
#define LP3972_B32RC_REG 0x87
#define LP3972_ISRA_REG 0x88
#define LP3972_BCCR_REG 0x89
#define LP3972_II1RR_REG 0x8E
#define LP3972_II2RR_REG 0x8F
#define LP3972_SYS_CONTROL1_REG LP3972_SCR1_REG
/* System control register 1 initial value,
* bits 5, 6 and 7 are EPROM programmable */
#define SYS_CONTROL1_INIT_VAL 0x02
#define SYS_CONTROL1_INIT_MASK 0x1F
#define LP3972_VOL_CHANGE_REG LP3972_VCC1_REG
#define LP3972_VOL_CHANGE_FLAG_GO 0x01
#define LP3972_VOL_CHANGE_FLAG_MASK 0x03
/* LDO output enable mask */
#define LP3972_OEN3_L1EN BIT(0)
#define LP3972_OVER2_LDO2_EN BIT(2)
#define LP3972_OVER2_LDO3_EN BIT(3)
#define LP3972_OVER2_LDO4_EN BIT(4)
#define LP3972_OVER1_S_EN BIT(2)
static const unsigned int ldo1_voltage_map[] = {
1700000, 1725000, 1750000, 1775000, 1800000, 1825000, 1850000, 1875000,
1900000, 1925000, 1950000, 1975000, 2000000,
};
static const unsigned int ldo23_voltage_map[] = {
1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
};
static const unsigned int ldo4_voltage_map[] = {
1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
};
static const unsigned int ldo5_voltage_map[] = {
0, 0, 0, 0, 0, 850000, 875000, 900000,
925000, 950000, 975000, 1000000, 1025000, 1050000, 1075000, 1100000,
1125000, 1150000, 1175000, 1200000, 1225000, 1250000, 1275000, 1300000,
1325000, 1350000, 1375000, 1400000, 1425000, 1450000, 1475000, 1500000,
};
static const unsigned int buck1_voltage_map[] = {
725000, 750000, 775000, 800000, 825000, 850000, 875000, 900000,
925000, 950000, 975000, 1000000, 1025000, 1050000, 1075000, 1100000,
1125000, 1150000, 1175000, 1200000, 1225000, 1250000, 1275000, 1300000,
1325000, 1350000, 1375000, 1400000, 1425000, 1450000, 1475000, 1500000,
};
static const unsigned int buck23_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,
};
static const int ldo_output_enable_mask[] = {
LP3972_OEN3_L1EN,
LP3972_OVER2_LDO2_EN,
LP3972_OVER2_LDO3_EN,
LP3972_OVER2_LDO4_EN,
LP3972_OVER1_S_EN,
};
static const int ldo_output_enable_addr[] = {
LP3972_OEN3_REG,
LP3972_OVER2_REG,
LP3972_OVER2_REG,
LP3972_OVER2_REG,
LP3972_OVER1_REG,
};
static const int ldo_vol_ctl_addr[] = {
LP3972_MDTV1_REG,
LP3972_L2VCR_REG,
LP3972_L34VCR_REG,
LP3972_L34VCR_REG,
LP3972_SDTV1_REG,
};
static const int buck_vol_enable_addr[] = {
LP3972_OVER1_REG,
LP3972_OEN3_REG,
LP3972_OEN3_REG,
};
static const int buck_base_addr[] = {
LP3972_ADTV1_REG,
LP3972_B2TV_REG,
LP3972_B3TV_REG,
};
#define LP3972_LDO_OUTPUT_ENABLE_MASK(x) (ldo_output_enable_mask[x])
#define LP3972_LDO_OUTPUT_ENABLE_REG(x) (ldo_output_enable_addr[x])
/* LDO voltage control registers shift:
LP3972_LDO1 -> 0, LP3972_LDO2 -> 4
LP3972_LDO3 -> 0, LP3972_LDO4 -> 4
LP3972_LDO5 -> 0
*/
#define LP3972_LDO_VOL_CONTR_SHIFT(x) (((x) & 1) << 2)
#define LP3972_LDO_VOL_CONTR_REG(x) (ldo_vol_ctl_addr[x])
#define LP3972_LDO_VOL_CHANGE_SHIFT(x) ((x) ? 4 : 6)
#define LP3972_LDO_VOL_MASK(x) (((x) % 4) ? 0x0f : 0x1f)
#define LP3972_LDO_VOL_MIN_IDX(x) (((x) == 4) ? 0x05 : 0x00)
#define LP3972_LDO_VOL_MAX_IDX(x) ((x) ? (((x) == 4) ? 0x1f : 0x0f) : 0x0c)
#define LP3972_BUCK_VOL_ENABLE_REG(x) (buck_vol_enable_addr[x])
#define LP3972_BUCK_VOL1_REG(x) (buck_base_addr[x])
#define LP3972_BUCK_VOL_MASK 0x1f
static int lp3972_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 lp3972_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 lp3972_reg_read(struct lp3972 *lp3972, u8 reg)
{
u16 val = 0;
mutex_lock(&lp3972->io_lock);
lp3972_i2c_read(lp3972->i2c, reg, 1, &val);
dev_dbg(lp3972->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
(unsigned)val & 0xff);
mutex_unlock(&lp3972->io_lock);
return val & 0xff;
}
static int lp3972_set_bits(struct lp3972 *lp3972, u8 reg, u16 mask, u16 val)
{
u16 tmp;
int ret;
mutex_lock(&lp3972->io_lock);
ret = lp3972_i2c_read(lp3972->i2c, reg, 1, &tmp);
if (ret == 0) {
tmp = (tmp & ~mask) | val;
ret = lp3972_i2c_write(lp3972->i2c, reg, 1, &tmp);
dev_dbg(lp3972->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
(unsigned)val & 0xff);
}
mutex_unlock(&lp3972->io_lock);
return ret;
}
static int lp3972_ldo_is_enabled(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3972_LDO1;
u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
u16 val;
val = lp3972_reg_read(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo));
return !!(val & mask);
}
static int lp3972_ldo_enable(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3972_LDO1;
u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo),
mask, mask);
}
static int lp3972_ldo_disable(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3972_LDO1;
u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo);
return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo),
mask, 0);
}
static int lp3972_ldo_get_voltage_sel(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3972_LDO1;
u16 mask = LP3972_LDO_VOL_MASK(ldo);
u16 val, reg;
reg = lp3972_reg_read(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo));
val = (reg >> LP3972_LDO_VOL_CONTR_SHIFT(ldo)) & mask;
return val;
}
static int lp3972_ldo_set_voltage_sel(struct regulator_dev *dev,
unsigned int selector)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int ldo = rdev_get_id(dev) - LP3972_LDO1;
int shift, ret;
shift = LP3972_LDO_VOL_CONTR_SHIFT(ldo);
ret = lp3972_set_bits(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo),
LP3972_LDO_VOL_MASK(ldo) << shift, selector << shift);
if (ret)
return ret;
/*
* LDO1 and LDO5 support voltage control by either target voltage1
* or target voltage2 register.
* We use target voltage1 register for LDO1 and LDO5 in this driver.
* We need to update voltage change control register(0x20) to enable
* LDO1 and LDO5 to change to their programmed target values.
*/
switch (ldo) {
case LP3972_LDO1:
case LP3972_LDO5:
shift = LP3972_LDO_VOL_CHANGE_SHIFT(ldo);
ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
LP3972_VOL_CHANGE_FLAG_MASK << shift,
LP3972_VOL_CHANGE_FLAG_GO << shift);
if (ret)
return ret;
ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
LP3972_VOL_CHANGE_FLAG_MASK << shift, 0);
break;
}
return ret;
}
static struct regulator_ops lp3972_ldo_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.is_enabled = lp3972_ldo_is_enabled,
.enable = lp3972_ldo_enable,
.disable = lp3972_ldo_disable,
.get_voltage_sel = lp3972_ldo_get_voltage_sel,
.set_voltage_sel = lp3972_ldo_set_voltage_sel,
};
static int lp3972_dcdc_is_enabled(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3972_DCDC1;
u16 mask = 1 << (buck * 2);
u16 val;
val = lp3972_reg_read(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck));
return !!(val & mask);
}
static int lp3972_dcdc_enable(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3972_DCDC1;
u16 mask = 1 << (buck * 2);
u16 val;
val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck),
mask, mask);
return val;
}
static int lp3972_dcdc_disable(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3972_DCDC1;
u16 mask = 1 << (buck * 2);
u16 val;
val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck),
mask, 0);
return val;
}
static int lp3972_dcdc_get_voltage_sel(struct regulator_dev *dev)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3972_DCDC1;
u16 reg;
reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck));
reg &= LP3972_BUCK_VOL_MASK;
return reg;
}
static int lp3972_dcdc_set_voltage_sel(struct regulator_dev *dev,
unsigned int selector)
{
struct lp3972 *lp3972 = rdev_get_drvdata(dev);
int buck = rdev_get_id(dev) - LP3972_DCDC1;
int ret;
ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck),
LP3972_BUCK_VOL_MASK, selector);
if (ret)
return ret;
if (buck != 0)
return ret;
ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
LP3972_VOL_CHANGE_FLAG_MASK, LP3972_VOL_CHANGE_FLAG_GO);
if (ret)
return ret;
return lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG,
LP3972_VOL_CHANGE_FLAG_MASK, 0);
}
static struct regulator_ops lp3972_dcdc_ops = {
.list_voltage = regulator_list_voltage_table,
.map_voltage = regulator_map_voltage_ascend,
.is_enabled = lp3972_dcdc_is_enabled,
.enable = lp3972_dcdc_enable,
.disable = lp3972_dcdc_disable,
.get_voltage_sel = lp3972_dcdc_get_voltage_sel,
.set_voltage_sel = lp3972_dcdc_set_voltage_sel,
};
static const struct regulator_desc regulators[] = {
{
.name = "LDO1",
.id = LP3972_LDO1,
.ops = &lp3972_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo1_voltage_map),
.volt_table = ldo1_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO2",
.id = LP3972_LDO2,
.ops = &lp3972_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo23_voltage_map),
.volt_table = ldo23_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO3",
.id = LP3972_LDO3,
.ops = &lp3972_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo23_voltage_map),
.volt_table = ldo23_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO4",
.id = LP3972_LDO4,
.ops = &lp3972_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo4_voltage_map),
.volt_table = ldo4_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "LDO5",
.id = LP3972_LDO5,
.ops = &lp3972_ldo_ops,
.n_voltages = ARRAY_SIZE(ldo5_voltage_map),
.volt_table = ldo5_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC1",
.id = LP3972_DCDC1,
.ops = &lp3972_dcdc_ops,
.n_voltages = ARRAY_SIZE(buck1_voltage_map),
.volt_table = buck1_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC2",
.id = LP3972_DCDC2,
.ops = &lp3972_dcdc_ops,
.n_voltages = ARRAY_SIZE(buck23_voltage_map),
.volt_table = buck23_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
{
.name = "DCDC3",
.id = LP3972_DCDC3,
.ops = &lp3972_dcdc_ops,
.n_voltages = ARRAY_SIZE(buck23_voltage_map),
.volt_table = buck23_voltage_map,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
},
};
static int setup_regulators(struct lp3972 *lp3972,
struct lp3972_platform_data *pdata)
{
int i, err;
/* Instantiate the regulators */
for (i = 0; i < pdata->num_regulators; i++) {
struct lp3972_regulator_subdev *reg = &pdata->regulators[i];
struct regulator_config config = { };
struct regulator_dev *rdev;
config.dev = lp3972->dev;
config.init_data = reg->initdata;
config.driver_data = lp3972;
rdev = devm_regulator_register(lp3972->dev,
&regulators[reg->id], &config);
if (IS_ERR(rdev)) {
err = PTR_ERR(rdev);
dev_err(lp3972->dev, "regulator init failed: %d\n",
err);
return err;
}
}
return 0;
}
static int lp3972_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct lp3972 *lp3972;
struct lp3972_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;
}
lp3972 = devm_kzalloc(&i2c->dev, sizeof(struct lp3972), GFP_KERNEL);
if (!lp3972)
return -ENOMEM;
lp3972->i2c = i2c;
lp3972->dev = &i2c->dev;
mutex_init(&lp3972->io_lock);
/* Detect LP3972 */
ret = lp3972_i2c_read(i2c, LP3972_SYS_CONTROL1_REG, 1, &val);
if (ret == 0 &&
(val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) {
ret = -ENODEV;
dev_err(&i2c->dev, "chip reported: val = 0x%x\n", val);
}
if (ret < 0) {
dev_err(&i2c->dev, "failed to detect device. ret = %d\n", ret);
return ret;
}
ret = setup_regulators(lp3972, pdata);
if (ret < 0)
return ret;
i2c_set_clientdata(i2c, lp3972);
return 0;
}
static const struct i2c_device_id lp3972_i2c_id[] = {
{ "lp3972", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lp3972_i2c_id);
static struct i2c_driver lp3972_i2c_driver = {
.driver = {
.name = "lp3972",
},
.probe = lp3972_i2c_probe,
.id_table = lp3972_i2c_id,
};
static int __init lp3972_module_init(void)
{
return i2c_add_driver(&lp3972_i2c_driver);
}
subsys_initcall(lp3972_module_init);
static void __exit lp3972_module_exit(void)
{
i2c_del_driver(&lp3972_i2c_driver);
}
module_exit(lp3972_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Axel Lin <axel.lin@gmail.com>");
MODULE_DESCRIPTION("LP3972 PMIC driver");
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