Dynamically unload kernel modules?

["Richard Hartmann" <richih.mailinglist@gmail.com>]

Hi all,

I would want to check if a module is in active use by hardware and
, if not, unload it. I.e. if there is no USB device connected when I 
run this script, I want to rmmod all USB related modules. I have tried
 to get that info via proc or lsmod, but neither worked.


Any hints appreciated,
Richard