# File /home/oliver/dev/powermate/PowerMate.rb, line 214
    def dev_name
      if !@name then 
        @name = "%code%" * 255                  # allocate string, 255 should be enough
        @device.ioctl( EVIOCGNAME, @name )  # retrieve device name
        @name.gsub!(/%code%.*/, '')             # strip extra NULLs
      end
      return @name
    end