TC654_REG_FAN_FAULT
ret = i2c_smbus_read_byte_data(client, TC654_REG_FAN_FAULT(0));
ret = i2c_smbus_read_byte_data(client, TC654_REG_FAN_FAULT(1));
ret = i2c_smbus_write_byte_data(client, TC654_REG_FAN_FAULT(nr),