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#!/bin/bash

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#------------------------------------------------------------------------------

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#

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#  Start script for EtherCAT to use with systemd

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#

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#  $Id$

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#

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#  Copyright (C) 2006-2012  Florian Pose, Ingenieurgemeinschaft IgH

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#

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#  This file is part of the IgH EtherCAT Master.

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#

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#  The IgH EtherCAT Master is free software; you can redistribute it and/or

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#  modify it under the terms of the GNU General Public License version 2, as

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#  published by the Free Software Foundation.

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#

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#  The IgH EtherCAT Master is distributed in the hope that it will be useful,

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#  but WITHOUT ANY WARRANTY; without even the implied warranty of

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#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General

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#  Public License for more details.

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#

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#  You should have received a copy of the GNU General Public License along

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#  with the IgH EtherCAT Master; if not, write to the Free Software

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#  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

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#

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#  ---

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#

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#  The license mentioned above concerns the source code only. Using the

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#  EtherCAT technology and brand is only permitted in compliance with the

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#  industrial property and similar rights of Beckhoff Automation GmbH.

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#

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#  vim: expandtab sw=4 tw=78

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#

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#------------------------------------------------------------------------------

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LSMOD=/sbin/lsmod

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MODPROBE=/sbin/modprobe

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RMMOD=/sbin/rmmod

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MODINFO=/sbin/modinfo

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ETHERCAT=@prefix@/bin/ethercat

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#------------------------------------------------------------------------------

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ETHERCAT_CONFIG=/etc/ethercat.conf

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if [ ! -r ${ETHERCAT_CONFIG} ]; then

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    echo ${ETHERCAT_CONFIG} not existing;

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    exit 6

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fi

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. ${ETHERCAT_CONFIG}

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#------------------------------------------------------------------------------

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parse_mac_address() {

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    if [ -z "${1}" ]; then

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        MAC=""

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    elif echo ${1} | grep -qE '^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$'; then

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        MAC=${1}

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    else

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        echo Invalid MAC address \"${1}\" in ${ETHERCAT_CONFIG}

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        exit 1

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    fi

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}

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#------------------------------------------------------------------------------

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case "${1}" in

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start)

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    # construct DEVICES and BACKUPS from configuration variables

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    DEVICES=""

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    BACKUPS=""

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    MASTER_INDEX=0

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    while true; do

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        DEVICE=$(eval echo "\${MASTER${MASTER_INDEX}_DEVICE}")

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        BACKUP=$(eval echo "\${MASTER${MASTER_INDEX}_BACKUP}")

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        if [ -z "${DEVICE}" ]; then break; fi

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        if [ ${MASTER_INDEX} -gt 0 ]; then

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            DEVICES=${DEVICES},

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            BACKUPS=${BACKUPS},

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        fi

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        parse_mac_address ${DEVICE}

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        DEVICES=${DEVICES}${MAC}

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        parse_mac_address ${BACKUP}

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        BACKUPS=${BACKUPS}${MAC}

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        MASTER_INDEX=$(expr ${MASTER_INDEX} + 1)

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    done

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    # load master module

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    if ! ${MODPROBE} ${MODPROBE_FLAGS} ec_master \

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            main_devices=${DEVICES} backup_devices=${BACKUPS}; then

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        exit 1

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    fi

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    LOADED_MODULES=ec_master

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    # check for modules to replace

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    for MODULE in ${DEVICE_MODULES}; do

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        ECMODULE=ec_${MODULE}

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        if ! ${MODINFO} ${ECMODULE} > /dev/null; then

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            continue # ec_* module not found

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        fi

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        if [ ${MODULE} != "generic" -a ${MODULE} != "ccat" ]; then

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            # try to unload standard module

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            if ${LSMOD} | grep "^${MODULE} " > /dev/null; then

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                if ! ${RMMOD} ${MODULE}; then

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                    ${RMMOD} ${LOADED_MODULES}

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                    exit 1

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                fi

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            fi

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        fi

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        if ! ${MODPROBE} ${MODPROBE_FLAGS} ${ECMODULE}; then

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            if [ ${MODULE} != "generic" -a ${MODULE} != "ccat" ]; then

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                ${MODPROBE} ${MODPROBE_FLAGS} ${MODULE} # try to restore

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            fi

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            ${RMMOD} ${LOADED_MODULES}

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            exit 1

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        fi

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        LOADED_MODULES="${ECMODULE} ${LOADED_MODULES}"

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    done

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    exit 0

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    ;;

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#------------------------------------------------------------------------------

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stop)

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    # unload EtherCAT device modules

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    for MODULE in ${DEVICE_MODULES} master; do

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        ECMODULE=ec_${MODULE}

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        if ! ${LSMOD} | grep -q "^${ECMODULE} "; then

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            continue # ec_* module not loaded

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        fi

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        if ! ${RMMOD} ${ECMODULE}; then

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            exit 1

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        fi;

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    done

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    sleep 1

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    # load standard modules again

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    for MODULE in ${DEVICE_MODULES}; do

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        if [ ${MODULE} == "generic" -o ${MODULE} == "ccat" ]; then

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            continue

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        fi

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        ${MODPROBE} ${MODPROBE_FLAGS} ${MODULE}

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    done

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    exit 0

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    ;;

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#------------------------------------------------------------------------------

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restart)

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    $0 stop || exit 1

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    sleep 1

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    $0 start

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    ;;

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#------------------------------------------------------------------------------

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status)

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    echo "Checking for EtherCAT master @VERSION@ "

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    # count masters in configuration file

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    MASTER_COUNT=0

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    while true; do

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        DEVICE=$(eval echo "\${MASTER${MASTER_COUNT}_DEVICE}")

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        if [ -z "${DEVICE}" ]; then break; fi

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        MASTER_COUNT=$(expr ${MASTER_COUNT} + 1)

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    done

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    RESULT=0

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    for i in `seq 0 $(expr ${MASTER_COUNT} - 1)`; do

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        echo -n "Master${i} "

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        # Check if the master is in idle or operation phase

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        ${ETHERCAT} master --master ${i} 2>/dev/null | \

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            grep -qE 'Phase:[[:space:]]*Idle|Phase:[[:space:]]*Operation'

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        EXITCODE=$?

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        if [ ${EXITCODE} -eq 0 ]; then

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            echo " running"

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        else

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            echo " dead"

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            RESULT=1

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        fi

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    done

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    exit ${RESULT}

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    ;;

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#------------------------------------------------------------------------------

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*)

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    echo "USAGE: $0 {start|stop|restart|status}"

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    exit 1

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    ;;

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esac

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#------------------------------------------------------------------------------