Just some feedback for anyone who's interested in linux USB support. John posted
a message on the linux-usb mailing list which generated some useful feedback:

1. It's possible to communicate with the empeg if you have installed generic
USB serial support even without the empeg driver:

modprobe usb-serial vendor=0x084f product=1
mknod /dev/ttyUSB0 c 188 0
emptool --usb /dev/ttyUSB0
(helps if you commment out DEBUG in usb-serial.c...)

2. Communications over UHCI are currently limited "by UHCI's scheduling
of bulk transfers (one 32/64-byte packet per millisecond)"

3. The empeg/acm driver creates one interrupt per millisecond whereas the
usb-serial one does one interrupt per packet (due to usb-serial limiting
the buffer size to the packet size), thus it runs about half the speed
of the empeg/acm driver.

I presume the 1 packet/ms problem will be addressed at some point in the
near future, but it has nothing to do with the empeg.

Paul