Question : How do I write Embedded Linux Driver for nXn matrix keyboard & LCD?

Hi,
I am attempting to write a 8 x 8 matrix keyboard driver for a open embedded linux platform, need help learning writing basic device drivers in linux and interfacing a 16 x 2 alphanumeric LCD based on the HD 44780 display controller.
I would like if someone would point me to links where i can understand Linux device driver development such as GPIO port usage etc.  This is for a embedded development platform.
Thanks

Answer : How do I write Embedded Linux Driver for nXn matrix keyboard & LCD?

when I visited the courses rtos and embedded linux we had a pretty cool script done by our prof. unfortunately i don't have it as pdf. but there's good books out there (and i know that you know how to get them as pdfs once you know the title)
get this one:
http://www.amazon.de/s?ie=UTF8&keywords=9780132396554&index=blended
and this:
http://www.amazon.com/Embedded-Linux-Hardware-Software-Interfacing/dp/0672322269

furthermore the internet brings:
- http://free-electrons.com/doc/embedded_linux_kernel_and_drivers.pdf
- http://www.linuxjournal.com/article/7355


if you know german you'll love this:
https://ezs.kr.hsnr.de//TreiberBuch/html//
(it is the university level course in linux driver development)

i try to find some more stuff for you...