Planning to write a device driver

Planning for writing a device driver on this week. My primary target is to write a driver which would be able to talk to any USB device. The conversations can be very simple. The problem is all devices are recognizable and automatically mounted by linux (like plug n play). I guess I have to remove the mounted device from kernel but not physically, then would be able to use my driver.

These are simply assumptions. Now I am going through few online materials. Here are some useful links.

http://kernelnewbies.org/
http://kernelnewbies.org/Drivers <- this page is like heaven for me!
http://www.linuxplanet.com/linuxplanet/tutorials/1019/
http://www.linuxdevices.com/articles/AT5340618290.html
http://developer.osdl.org/dev/opendrivers/
http://www.tldp.org/HOWTO/IO-Port-Programming.html
http://www2.linuxjournal.com/article/2920

Well there's a totally dedicated site for USB devices
http://www.linux-usb.org/

Dedicated serial driver how-to's
http://www.easysw.com/~mike/serial/serial.html


I am still choosing which device to use. Cell phones can be a good choice. Cell phone manufacturers usually provide windows drivers and applications, but linux users are totally ignored. I may try to write a driver for my cell phone. Which is Motorola branded.
Fortunately Motorola has a developer network, that might be useful
http://developer.motorola.com/