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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, Ahmad Fatoum, Pengutronix
*/
#include <i2c/i2c.h>
#include <linux/regmap.h>
static int regmap_i2c_read(void *context,
const void *reg, size_t reg_size,
void *val, size_t val_size)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
struct i2c_msg xfer[2];
int ret;
xfer[0].addr = i2c->addr;
xfer[0].flags = 0;
xfer[0].len = reg_size;
xfer[0].buf = (void *)reg;
xfer[1].addr = i2c->addr;
xfer[1].flags = I2C_M_RD;
xfer[1].len = val_size;
xfer[1].buf = val;
ret = i2c_transfer(i2c->adapter, xfer, 2);
if (ret == 2)
return 0;
else if (ret < 0)
return ret;
else
return -EIO;
}
static int regmap_i2c_write(void *context, const void *data, size_t count)
{
struct device *dev = context;
struct i2c_client *i2c = to_i2c_client(dev);
int ret;
ret = i2c_master_send(i2c, data, count);
if (ret == count)
return 0;
else if (ret < 0)
return ret;
else
return -EIO;
}
static const struct regmap_bus regmap_regmap_i2c_bus = {
.write = regmap_i2c_write,
.read = regmap_i2c_read,
.reg_format_endian_default = REGMAP_ENDIAN_BIG,
.val_format_endian_default = REGMAP_ENDIAN_BIG,
};
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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