So here is a little quick little howto on how to get the dv2120us webcam working in Linux.
I am using the 2.6.20-rc5 kernel, which at the time of writing this is the latest release candidate kernel. It was not picked up in Linux but a lspci produced the following
03:09.2 System peripheral: Ricoh Co Ltd Unknown device 0843 (rev 01)
I think that is it.. I am not sure if it sees it as a usb or pci device or not. The module uses usbcore so its beyond me. So to get it working I ran the following commands
svn checkout http://svn.berlios.de/svnroot/repos/linux-uvc/
cd linux-uvc/linux-uvc/trunk/
make
make install
modprobe uvcvideo
You should see something like this in your dmesg once you load it
[ 1022.224000] usbcore: deregistering interface driver uvcvideo
[ 1045.764000] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (0c45:62c0)
[ 1045.764000] usbcore: registered new interface driver uvcvideo
[ 1045.764000] USB Video Class driver (v0.1.0)
Also on a side not it sees it as a v4l2 device and not a v4l device