LM73_REG_CTRL
err = i2c_smbus_write_byte_data(data->client, LM73_REG_CTRL,
ctrl = i2c_smbus_read_byte_data(data->client, LM73_REG_CTRL);
ctrl = i2c_smbus_read_byte_data(client, LM73_REG_CTRL);
ctrl = i2c_smbus_read_byte_data(new_client, LM73_REG_CTRL);