#!/bin/sh
version="1.5.1"
base_path=/sys/bus/usb/devices

query_mode=true
as_control=
timeout=
control_mask=".*"
runtime_status_mask=".*"
recursive=false

usage()
{
	echo "USB power management utility $version"
	echo "Usage: pmusb [OPTIONS] [DEVICES]"
	echo "  -r           - recursive (including all the children)"
	echo "  -m MODE      - on|auto. If omitted, status is displayed (query mode)"
	echo "  -t TIMEOUT   - autosuspend timeout in seconds"
	echo "  -c CMASK     - control file mask (query mode only)"
	echo "  -s SMASK     - runtime status file mask (query mode only)"
	echo "  -t TIMEOUT   - autosuspend timeout in seconds"
	echo "  DEVICES      - names of USB device (usb1, usb2, usb1/1-1 ...). If omitted, all devices"
}

as_control()
{
	local dev_path=${1%%/.}
	local dev_name=`basename $dev_path`;

	autosuspend_file=$dev_path/power/autosuspend 
	control_file=$dev_path/power/control 
	level_file=$dev_path/power/level 
	runtime_status_file=$dev_path/power/runtime_status
	[ ! -f $control_file ] && control_file=$level_file
	if [ -f "$control_file" -o -f "$level_file" ] ; then
		supported_device=1
		if [ -f "$runtime_status_file" ] ; then
			[ ! -z `grep 'active\|suspended' $runtime_status_file` ] || supported_device=
		fi 
		if [ ! -z "$supported_device" ] ; then
			if [ "$query_mode" = "true" ] ; then
				filter_out=0
				[ -z "`grep $control_mask $control_file`" ] && filter_out=1
				if [ -f "$runtime_status_file" ] ; then
					[ -z "`grep $runtime_status_mask $runtime_status_file`" ] && filter_out=1
				fi
				if [ $filter_out -eq 0 ] ; then
					echo "$dev_name ($dev_path):"
					if [ -r "$control_file" ] ; then
						echo -n "  control       : " ; cat $control_file
					fi
					if [ -r "$runtime_status_file" ] ; then
						echo -n "  runtime_status: " ; cat $runtime_status_file
					fi
					if [ -r "$autosuspend_file" ] ; then
						echo -n "  autosuspend   : " ; cat $autosuspend_file
					fi
				fi
			else
				[ -f "$autosuspend_file" -a ! -z "$timeout" ] && echo $timeout > $autosuspend_file
				if [ ! -z "$as_control" ] ; then
					[ -w "$control_file" ] && echo $as_control > $control_file
				fi
			fi
		fi
	fi
}

while getopts "m:t:h?rc:s:" option
do
	case $option in
	m)
		query_mode=false
		as_control=$OPTARG 
		if [ ! "$as_control" = "auto" -a ! "$as_control" = "on" ] ; then
			usage
			exit 1	
		fi
		;;
	r)
		recursive=true ;;
	c)
		control_mask=$OPTARG ;;
	s)
		runtime_status_mask=$OPTARG ;;
	t)
		query_mode=false
		timeout=$OPTARG ;;
	h|?|*)
		usage
		exit 1 ;;
	esac
done

# the rest are device names
shift $(($OPTIND-1));

# no pushd/popd in ash
save_pwd=`pwd`
cd $base_path

if [ -z "$1" ] ; then
	# all usb controllers
	dev_name_list=`ls -d usb*`
else
	# some usb controllers
	dev_name_list="$*"
fi

for dev_name in $dev_name_list ; do
	if [ "$recursive" = "true" ] ; then
		save_pwd2=`pwd`
		cd $base_path/$dev_name
		ch_dev_name_list=`find . -type d`
		for ch_dev_name in $ch_dev_name_list ; do
			as_control $base_path/$dev_name/$ch_dev_name
		done
		cd $save_pwd2
	else
		as_control $base_path/$dev_name
	fi
done

cd $save_pwd