#execext usbreset "$@"
#_ES=$? ; [ $_ES -ne 127 ] && exit $_ES 

# args checking
if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
	echo "usage: $(basename $0) [USB_BUS:USB:DEV]"
	echo
	echo "will reset ALL USB ports if no one specified."
	echo "tip: check USB ports addresses with the lsusb command"
	exit 0
fi

if [ ! -e "$1" ]; then
	echo "$(basename $0): about to reset ALL USB ports"
	echo "$(basename $0): type 'ok' and press Enter to continue"
	read
	if [ "$REPLY" != "ok" ]; then
		echo "$(basename $0): reset cancelled"
		exit 1
	fi

	# http://askubuntu.com/a/290519
	# TODO: check mounted usb mass storage devices
	for i in $(ls /sys/bus/pci/drivers/ehci_hcd/|grep :)
		do echo $i >/sys/bus/pci/drivers/ehci_hcd/unbind
		echo $i >/sys/bus/pci/drivers/ehci_hcd/bind
	done
	for i in $(ls /sys/bus/pci/drivers/xhci_hcd/|grep :)
		do echo $i >/sys/bus/pci/drivers/xhci_hcd/unbind
		echo $i >/sys/bus/pci/drivers/xhci_hcd/bind
	done

	exit 0
fi

# else reset a single port
echo "$(basename $0): about to reset the USB port $1"
echo "$(basename $0): Press any key to continue or Ctrl-C to abort... "; read -s -n 1

#sudo sh -c "echo 1 > /sys/bus/usb/drivers/usb/$1/remove"

sudo sh -c "echo 0 > /sys/bus/usb/devices/$1/authorized"
sudo sh -c "echo 1 > /sys/bus/usb/devices/$1/authorized"

#	... http://billauer.co.il/blog/2013/02/usb-reset-ehci-uhci-linux/
#	... http://www.linux.org/threads/resetting-the-usb-subsystem.6256/
#	... http://askubuntu.com/questions/645/how-do-you-reset-a-usb-device-from-the-command-line

exit 0