How to write an Hello world driver for linux

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http://stackoverflow.com – Recently I'm much excited about linux. I would like to learn how to write simple linux drivers.I know C and python . I'm using ubuntu 11.10 (3.0.0-12-generic kernal). My Doubts What are the requirements to need to develop and study simple linux driver programs I see may tutorials.But that all are not good in beginner level.Could you please suggest a better tutorial exactly for beginners. How compile , run and see whether my driver is working. (HowTos)