If I were asked?????
 

If I were asked to write a linux device driver for a pen, How should I start??? Any help would be appreciated.

Thanks a lot.

Hi, try the linux documentation project (tldp.org) : start with modules and continue with drivers

How is pen connected to processor?

Is processor part of the pen? or pen some how get attached to cpu/pc ?

...

Thanks a lot for your replies.
I meant pen in the sense any device which communicates with cpu.