reset_usb_devices

#!/bin/bash
#
# created by Eli Billauer
#
# * http://billauer.co.il/blog/2013/02/usb-reset-ehci-uhci-linux/
#
# license/copyright: CC0
# * https://creativecommons.org/choose/zero/

help() {
   echo 'usage: reset_usb_devices'
   echo
   echo '    resets all USB devices that the script finds'
   echo 
   exit
}

[ "$1" == "--help" ] && help

# expant patterns which don't match to a null string
shopt -s nullglob

if [[ $EUID != 0 ]] ; then
  echo This must be run as root!
  exit 1
fi

for xhci in /sys/bus/pci/drivers/?hci_hcd ; do

  if ! cd $xhci ; then
    echo Weird error. Failed to change directory to $xhci
    exit 1
  fi

  echo Resetting devices from $xhci...

  for i in ????:??:??.? ; do
    echo -n "$i" > unbind
    echo -n "$i" > bind
  done
done