I did start work on getting my USB scanner working on plan9.
I have an agfa 1212u which is USB.
I got a USB sniffer for Windows and the SANE code and was going through
it byte by byte. I had it uploading the firmware and could make the
scanning arm move.
/n/sources/contrib/maht/spanscan.iso
I think I might even have it doing preview scan but not interpreting the
data, I forget, it was two years ago.
another one of those things on the list of 'I must go back to that'
If anyone knows of a decent free USB sniffer for Linux / BSD then that
would help anyone wanting to do this.
Matt