RT5133_I2C_ADDR_LEN
int buf_len = RT5133_I2C_ADDR_LEN + count + RT5133_I2C_CRC_LEN +
crc = crc8(priv->crc8_tbls, buf, RT5133_I2C_ADDR_LEN + count, 0);
buf[RT5133_I2C_ADDR_LEN + count] = crc;