Hello. I have been reading on linux kernel development and device drivers for a while. I feel ready to give it a go. I would like to write a driver for a, preferably usb (otherwise pci), device for a desktop computer. But every device I seem to think of is already supported (including everything I own atm). So, would welcome any suggestions.

P.S. Willing to buy it, provided it's under £100 (150$).

"Stand upon the shoulders of giants." Surf the Linux source-code tree to find examples of device drivers similar to yours.

It is perfectly fine to take an existing driver and to, in your own mind at least, "try to beat it at its own game." You can certainly "learn from writing a device driver" without actually writing a new one of your own. We can all be very grateful to the fact that so many of our colleagues have freely given of their own work and expertise. (And in time we can perhaps return the favor, to our collective and mutual advantage.)

Thanks. Gonna go with a usb missile launcher, since it sounds kinda fun and not too complicated, even though I believe there is already a driver (or even two) for it.
http://www.amazon.co.uk/USB-Storm-O-...4165273&sr=8-7