#!/bin/busybox ash

usage() {
	printf "usage: %s [add|list|del|action] [subsystem]\n" "$(basename $1)" >&2
	exit 1
}

action="list"
if [ $# -gt 0 ];
then
	action="$1"
fi

if [ "$action" = "list" ];
then
	printf "class:\n"
	for i in /sys/class/*;
	do
		printf "\t%s\n" $(basename $i)
	done

	printf "bus:\n"
	for i in /sys/bus/*;
	do
		printf "\t%s\n" $(basename $i)
	done

	printf "devices:\n"
	for i in /sys/devices/*;
	do
		printf "\t%s\n" $(basename $i)
	done

	exit 0
fi

if [ $# -lt 2 ];
then
	usage "$0"
fi
subsystem="$2"

if [ "$subsystem" != "all" ];
then
	if [ -d /sys/class/$subsystem ];
	then
		for i in /sys/class/$subsystem/*/uevent;
		do
			echo $action > $i
		done
		exit 0
	fi

	if [ -d /sys/bus/$subsystem ];
	then
		for i in /sys/bus/$subsystem/devices/*/uevent;
		do
			echo $action > $i
		done
		exit 0
	fi

	if [ -d /sys/devices/$subsystem ];
	then
		for i in /sys/devices/$subsystem/*/uevent \
			/sys/devices/$subsystem/*/*/uevent;
		do
			echo $action > $i
		done
		exit 0
	fi

	printf "Could not find subsystem '%s'.\n" $i >&2
	exit 1
fi

for i in /sys/class/*/*/uevent;
do
	echo $action > $i
done

exit 0

