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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, Ahmad Fatoum, Pengutronix
*/
#include <i2c/i2c.h>
#include <regmap.h>
static int regmap_i2c_reg_read(void *client, unsigned int reg, unsigned int *val)
{
u8 buf[1];
int ret;
ret = i2c_read_reg(client, reg, buf, 1);
if (ret != 1)
return ret;
*val = buf[0];
return 0;
}
static int regmap_i2c_reg_write(void *client, unsigned int reg, unsigned int val)
{
u8 buf[] = { val & 0xff };
int ret;
ret = i2c_write_reg(client, reg, buf, 1);
if (ret != 1)
return ret;
return 0;
}
static const struct regmap_bus regmap_regmap_i2c_bus = {
.reg_write = regmap_i2c_reg_write,
.reg_read = regmap_i2c_reg_read,
};
struct regmap *regmap_init_i2c(struct i2c_client *client,
const struct regmap_config *config)
{
return regmap_init(&client->dev, ®map_regmap_i2c_bus, client, config);
}
static int regmap_smbus_byte_reg_read(void *client, unsigned int reg, unsigned int *val)
{
int ret;
if (reg > 0xff)
return -EINVAL;
ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
return ret;
*val = ret;
return 0;
}
static int regmap_smbus_byte_reg_write(void *client, unsigned int reg, unsigned int val)
{
if (val > 0xff || reg > 0xff)
return -EINVAL;
return i2c_smbus_write_byte_data(client, reg, val);
}
static const struct regmap_bus regmap_smbus_byte = {
.reg_write = regmap_smbus_byte_reg_write,
.reg_read = regmap_smbus_byte_reg_read,
};
struct regmap *regmap_init_i2c_smbus(struct i2c_client *client,
const struct regmap_config *config)
{
if (config->val_bits != 8 || config->reg_bits != 8)
return ERR_PTR(-ENOSYS);
return regmap_init(&client->dev, ®map_smbus_byte, client, config);
}
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