USB Device Driver

Hello, During Google Summer of Code we are developing an USB Device Driver for an Android phone. Mainly we want to make an ADK driver *switch the phone to ADK mode or back to normal mode from inside the kernel*. I looked a bit over the Internet to find a recent example of USB Device Drivers but the ones I have found are from 2006 or so *old Kernel versions*. Do you guys have a more recent example, preferably not drivers/usb/usb-skeleton.c . -- Vlad Ungureanu