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My real goal is to test my implementation of some parts of the USB protocol. Basically, I want to get a second opinion from another program that I've generated the correct descriptors. If I can manually add a new USB device in linux using my generated descriptors, then I can use 

lsusb -vvv

to parse the descriptors back out, which I could use to verify that I'm doing things correctly.

Is this possible?

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This really seems like a hardware design question - If you have something that talks USB and sends your descriptors through a USB port then assuming you've implemented a reasonable approximation of the USB protocol you will see log messages from udev (or whatever other device management stuff your distro uses) recognizing that something was plugged in, and your hardware's info will show up when you run lsusb, but anything beyond that isn't a computer-side project (and certainly not a sysadmin task per the FAQ) – voretaq7♦ Aug 13 '12 at 22:14

closed as off topic by Zoredache, Michael Hampton, DerfK, voretaq7♦ Aug 13 '12 at 22:11

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