MCU_REG_CTRL
ret = i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,
ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);
ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);
i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,
ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);
i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,