#!/bin/bash
###############################################################################
#                                                                             #
# IPFire.org - A linux based firewall                                         #
# Copyright (C) 2013  IPFire Network Development Team                         #
#                                                                             #
# This program is free software: you can redistribute it and/or modify        #
# it under the terms of the GNU General Public License as published by        #
# the Free Software Foundation, either version 3 of the License, or           #
# (at your option) any later version.                                         #
#                                                                             #
# This program is distributed in the hope that it will be useful,             #
# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
# GNU General Public License for more details.                                #
#                                                                             #
# You should have received a copy of the GNU General Public License           #
# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
#                                                                             #
###############################################################################

function usb_device_find_by_tty() {
	local tty="${1}"
	assert isset tty

	# Strip /dev.
	tty="$(basename "${tty}")"

	local path="/sys/bus/usb-serial/devices/${tty}"

	# Resolve symlink
	path="$(readlink -m "${path}")"

	print "$(dirname "${path}")"
	return ${EXIT_OK}
}

function usb_device_list_interfaces() {
	local path="${1}"
	assert [ -d "${path}" ]

	local interface
	for interface in ${path}/ep_*; do
		[ -d "${interface}" ] || continue
		print "${interface}"
	done

	return ${EXIT_OK}
}

function usb_device_get_interface_type() {
	local interface="${1}"
	assert isset interface

	fread "${interface}/type"
}

function usb_device_has_interface_type_interrupt() {
	local device="${1}"
	assert isset device

	local interface type
	while read -r interface; do
		type="$(usb_device_get_interface_type "${interface}")"

		[ "${type}" = "Interrupt" ] && return ${EXIT_TRUE}
	done <<< "$(usb_device_list_interfaces "${device}")"

	return ${EXIT_FALSE}
}