Shell Script to Disconnect / Reconnect USB device

turn-off-device.sh

#!/bin/bash

# In my case, I would like to turn off my HUGE TRACKBALL sometimes, because it
# gets disconnected from the USB bus... Not very often, but a few times per month
# I launch this script with a tool like `rofi` or `dmenu`.
# 
# You can easily adjust this script to work for any USB device by changing the
# these variables for the hex code of vendor and product.
#
#
#VENDOR="056e"
#PRODUCT="010d"
#
# You get these codes from lsusb

if [[ $EUID -ne 0 ]]; then
  exec sudo /bin/bash "$0" "$@"
  echo "This script must be run as root" 1>&2
  echo "  Root permission required to write to /sys/bus/usb/devices"
  exit 1
fi

echo "
o  o o   o  o-o  o--o     o-O-o o--o    O    o-o o  o o--o    O  o    o    
|  | |   | o     |          |   |   |  / \  /    | /  |   |  / \ |    |    
O--O |   | |  -o O-o  o-o   |   O-Oo  o---oO     OO   O--o  o---o|    |    
|  | |   | o   | |          |   |  \  |   | \    | \  |   | |   ||    |    
o  o  o-o   o-o  o--o       o   o   o o   o  o-o o  o o--o  o   oO---oO---o
"


set -euo pipefail
IFS=$'\n\t'

# Bus 001 Device 068: ID 056e:010d Elecom Co., Ltd HUGE TrackBall
VENDOR="056e"
PRODUCT="010d"

for DIR in $(find /sys/bus/usb/devices/ -maxdepth 1 -type l); do
  if [[ -f $DIR/idVendor && -f $DIR/idProduct &&
        $(cat $DIR/idVendor) == $VENDOR && $(cat $DIR/idProduct) == $PRODUCT ]]; then
    DEVICE=$(basename $DIR)
    echo "Device: $DEVICE"
    echo "Path:   $DIR"
    echo
    echo

    echo "Unbinding USB Device"
    echo $DEVICE > /sys/bus/usb/drivers/usb/unbind
    sleep 1
    echo "Rebinding USB Device"
    echo $DEVICE > /sys/bus/usb/drivers/usb/bind
    sleep 1


    echo "Trying the usb/authorized way..."
    echo "Disconnecting..."
    echo 0 > $DIR/authorized
    sleep 1
    echo "Reconnecting..."
    echo 1 > $DIR/authorized
  fi
done

echo 
echo "Complete"

notify-send "Reconnect Complete" "Huge Trackball Reconnection Complete"