TC654_REG_CONFIG
ret = i2c_smbus_read_byte_data(client, TC654_REG_CONFIG);
ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config);
ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config);
ret = i2c_smbus_write_byte_data(client, TC654_REG_CONFIG, data->config);
ret = i2c_smbus_read_byte_data(client, TC654_REG_CONFIG);