A device driver is computer program allowing other computer programs to interact with a computer hardware device. Writing a Linux device driver is considered as a black art by many. If you ever been tempted to try writing a device driver, this howto will serve as a kick start guide:
For many seasoned Linux developers, device drivers still remain a bit of a mysterious black art practiced by a select few. While no single article could possibly attempt to covered everything there is to know about writing drivers, Valerie Henson gives us a brief taste of what’s involved, by implementing a device to return “Hello World” using all the major driver frameworks.
On a related note if you just want get a comprehensive overview of kernel configuration and building, a critical task for Linux users and administrators, try Linux Kernel in a Nutshell
/dev/hello_world: A Simple Introduction to Device Drivers under Linux (linuxdevcenter.com)
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Check this link
http://www.freesoftwaremagazine.com/articles/drivers_linux
this also defines writing device driver easily.
Should be a good start for any one.
Thanks for providing excellent links..