core-agent-linux/misc/usb_add_change

#!/bin/sh

##
## This script is invoked by udev rules whenever USB device appears or
## changes. This happens in usbvm domain (or dom0 if USB controller
## drivers are in dom0). The script records information about available
## USB devices into XS directory, making it available to qvm-usb tool
## running in dom0.
##

# FIXME: Ignore USB hubs and other wierd devices (see also in usb_remove).
[ "`echo $TYPE | cut -f1 -d/`" = "9" ] && exit 0
[ "$DEVTYPE" != "usb_device" ] && exit 0

# xenstore doesn't allow dot in key name
NAME=`basename ${DEVPATH}`
XSNAME=`echo ${NAME} | tr . _`

# FIXME: For some devices (my Cherry keyboard) ID_SERIAL does not
# contain proper human-readable name, should find better method to
# build devide description.
#DESC=`python -c "dev='%d-%d' % (int('${BUSNUM}'.lstrip('0')), (int('${DEVNUM}'.lstrip('0'))-1)); from xen.util import vusb_util; print vusb_util.get_usbdevice_info(dev);"`
DESC="${ID_VENDOR_ID}:${ID_MODEL_ID} ${ID_SERIAL}"

VERSION=`cat /sys/bus/usb/devices/${NAME}/version`
if [ "${VERSION}" = " 1.00" -o "${VERSION}" = " 1.10" ] ; then
	VERSION=1
elif [ "${VERSION}" = " 2.00" ] ; then
	VERSION=2
else
	# FIXME: silently ignoring devices with unexpected USB version
	exit 0
fi

XS_KEY="qubes-usb-devices/$XSNAME"

xenstore-write "$XS_KEY/desc" "$DESC"
xenstore-write "$XS_KEY/usb-ver" "$VERSION"

# Make sure PVUSB backend driver is loaded.
/sbin/modprobe xen-usbback 2> /dev/null || /sbin/modprobe usbbk