I'm also new to Linux device driver world and am interested to learn. Besides learning and fun, I want to write a driver for Green Packet's UH-235 wimax modem. Probably you could also join? :)

If you are interested, we could find out, as a first step,

How the Kernel responses, when any hardware is attached to a system that runs Linux?

Probably, dmesg command can help us a bit. Our next step would be to find out,

How to hack/know about a device attached with a Linux system, provided that there is no driver currently available for the device?

I've also collected the source file provided by Green Packet. It was actually a deb file and I extracted it. There is really no source except shared object (.so/.ko) files. This deb file, reportedly, only works in Ubuntu 9.04, which uses Linux Kernel Version 2.6.28. Any other installation on newer Ubuntu failed. Possibly be a Kernel issue? Let's find out! If you want the deb/source file, let me know. I'll mail you. Green Packet's UH-235 wimax modem uses Mediateks m7118 SoC. And reportedly, Mediatek's chips are not developer friendly. Like they don't provide useful information to the developers outside. :P

Happy hacking!