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alistair23-linux/drivers/regulator/lp3971.c
Dmitry Torokhov ebbed04fe7 Regulators: lp3971 - fail if platform data was not supplied 
There is no point in completing probe if platform data is missing so
let's abort loading early.

Also, use kcalloc when allocating several instances of the same data
structure and mark setup_regulators() as __devinit since it is only
called from lp3971_i2c_probe() which is __devinit.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2010-03-03 14:49:28 +00:00

563 lines
14 KiB
C
Raw Blame History

/*
* 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
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 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
static const int ldo45_voltage_map[] = {
1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350,
1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300,
};
static const int ldo123_voltage_map[] = {
1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500,
2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300,
};
static const 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 (val > LDO_VOL_MAX_IDX || 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 (val > BUCK_TARGET_VOL_MAX_IDX || 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 __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);
/* Instantiate the regulators */
for (i = 0; i < pdata->num_regulators; i++) {
struct lp3971_regulator_subdev *reg = &pdata->regulators[i];
lp3971->rdev[i] = regulator_register(&regulators[reg->id],
lp3971->dev, reg->initdata, lp3971);
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;
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;
i2c_set_clientdata(i2c, NULL);
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 = __devexit_p(lp3971_i2c_remove),
.id_table = lp3971_i2c_id,
};
static int __init lp3971_module_init(void)
{
int ret;
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");
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