etc/can_if

   1 #!/bin/sh
   2
   3 ### BEGIN INIT INFO
   4 # Provides:           can_if
   5 # Required-Start:     $local_fs $syslog mountkernfs
   6 # Required-Stop:      $local_fs $syslog mountkernfs
   7 # Default-Start:      2 3 4 5
   8 # Default-Stop:       0 1 6
   9 # Short-Description:  Starts the configured CAN-Interfaces and creates virtual CAN Interfaces on the system.
  10 ### END INIT INFO
  11
  12 #
  13 # $Id$
  14 #
  15 # Simple script to start CAN and VCAN interfaces with netlink configuration
  16 #
  17 # Copyright (c) 2009 Volkswagen Group Electronic Research
  18 #
  19
  20 # Exit if 'ip' from the iproute2 package is not installed
  21 test -x /sbin/ip || exit 0
  22
  23 # On some systems the automatic module loading via
  24 # /etc/modules.conf is quite slow. To ensure the immediately
  25 # availability of specific modules you can define critical
  26 # modules in the PROBE variable. E.g. PROBE="can-tp20"
  27
  28 # Exit if modprobe is not installed
  29 test -x /sbin/modprobe || exit 0
  30
  31 # The syntax for the CAN devices is: devname[@bitrate][,restart-ms]
  32 # example CAN_IF="can0 can1@500000 can2@500000,200 can3,500"
  33 CAN_IF=""
  34
  35 # To modify the sampling-point and SJW settings for the in-kernel bittiming
  36 # calculation. "0" => set default values (CAN CIA sampling-point / sjw=1)
  37 SAMPOINT="0" # example for 84% : SAMPOINT=".840"
  38 SJW="0"      # example for max. sjw : SJW="4"
  39
  40 VCAN_IF="vcan0 vcan1 vcan2 vcan3"
  41 PROBE="vcan"
  42
  43 case "$1" in
  44         start|force-reload)
  45         if [ -n "$PROBE" ] ; then
  46                 echo -n "Extra probing CAN modules:"
  47                 for MODULE in $PROBE; do
  48                         echo -n " "$MODULE
  49                         /sbin/modprobe -q $MODULE
  50                 done
  51                 echo "."
  52         fi
  53         if [ -n "$CAN_IF" ] ; then
  54                 echo -n "Enabling CAN interfaces:"
  55                 for IF in $CAN_IF; do
  56                         echo -n " "$IF
  57                         DEVICE=${IF%@*}
  58                         DEVICE=${DEVICE%,*}
  59                         HASBTR=`echo $IF | grep "@"`
  60                         if [ -n "$HASBTR" ]; then
  61                                 BITRATE=${IF#*@}
  62                                 BITRATE=${BITRATE%,*}
  63                                 /sbin/ip link set $DEVICE type can bitrate $BITRATE sample-point $SAMPOINT sjw $SJW
  64                         fi
  65                         HASMS=`echo $IF | grep ","`
  66                         if [ -n "$HASMS" ]; then
  67                                 RESTARTMS=${IF#*,}
  68                                 /sbin/ip link set $DEVICE type can restart-ms $RESTARTMS
  69                         fi
  70                         /sbin/ip link set $DEVICE up
  71                 done
  72                 echo "."
  73         fi
  74         if [ -n "$VCAN_IF" ] ; then
  75                 echo -n "Creating and enabling virtual CAN interfaces:"
  76                 for IF in $VCAN_IF; do
  77                         echo -n " "$IF
  78                         /sbin/ip link add name $IF type vcan
  79                         /sbin/ip link set $IF up
  80                 done
  81                 echo "."
  82         fi
  83         ;;
  84         restart|reload)
  85         if [ -n "$CAN_IF" ] ; then
  86                 echo -n "Restarting CAN interfaces:"
  87                 for IF in $CAN_IF; do
  88                         DEVICE=${IF%@*}
  89                         DEVICE=${DEVICE%,*}
  90                         echo -n " "$DEVICE
  91                         /sbin/ip link set $DEVICE down
  92                         /sbin/ip link set $DEVICE up
  93                 done
  94                 echo "."
  95         fi
  96         if [ -n "$VCAN_IF" ] ; then
  97                 echo -n "Restarting virtual CAN interfaces:"
  98                 for IF in $VCAN_IF; do
  99                         echo -n " "$IF
 100                         /sbin/ip link set $IF down
 101                         /sbin/ip link set $IF up
 102                 done
 103                 echo "."
 104         fi
 105         ;;
 106         stop)
 107         if [ -n "$CAN_IF" ] ; then
 108                 echo -n "Shutting down CAN interfaces:"
 109                 for IF in $CAN_IF; do
 110                         DEVICE=${IF%@*}
 111                         DEVICE=${DEVICE%,*}
 112                         echo -n " "$DEVICE
 113                         /sbin/ip link set $DEVICE down
 114                 done
 115                 echo "."
 116         fi
 117         if [ -n "$VCAN_IF" ] ; then
 118                 echo -n "Shutting down and removing virtual CAN interfaces:"
 119                 for IF in $VCAN_IF; do
 120                         echo -n " "$IF
 121                         /sbin/ip link set $IF down
 122                         /sbin/ip link del $IF
 123                 done
 124                 echo "."
 125         fi
 126         ;;
 127         *)
 128         echo "Usage: /etc/init.d/can_if {start|stop|restart|reload|force-reload}"
 129         exit 1
 130 esac
 131
 132 exit 0