#!/bin/bash

# Enable USB autosuspend.

USB_AUTOSUSPEND=${USB_AUTOSUSPEND:-true}

help() {
cat <<EOF
--------
$0: USB autosuspend.

This hook has 1 tuneable parameter. 
USB_AUTOSUSPEND = controls whether we will try to save power on battery.
Defaults to true.

EOF
}

usb_autosuspend() {
	[ "$USB_AUTOSUSPEND" = "true" ] || exit $NA
	if [ "$1" = "auto" ]; then
		printf "Enabling USB autosuspend... "
	else
		printf "Disabling USB autosuspend... "
	fi
	for i in /sys/bus/usb/devices/*/power/level; do
		echo "$1" > $i
	done
	for i in /sys/bus/usb/devices/*/power/autosuspend; do
		echo "2" > $i
	done
	echo Done.
	
}

case $1 in
    true) usb_autosuspend auto ;;
    false) usb_autosuspend on ;;
    help) help;;
    *) exit $NA
esac

exit 0