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#!/bin/sh
#
# gpsinit - initialize kernel-CAN interfaces
#
# This file is Copyright 2012 by the GPSD project.
# SPDX-License-Identifier: BSD-2-clause
#
net=0
version()
{
echo "$(basename "$0") : Version v0.21";
}
usage()
{
version; echo;
echo "usage : $(basename "$0") [-n <netnumber>] <can_module_name> [<interface_name>]";
echo " : $(basename "$0") -V";
echo " : $(basename "$0") -h";
echo " Options include:";
echo " -? = Print this help message and exit.";
echo " -h = Print this help message and exit.";
echo " -n = CAN network number, 0 if not given.";
echo " -V = Print version of this script and exit.";
echo " can_module_name = One out of plx_pci, esd_usb2, usb_8dev, vcan, slcan, beaglebone.";
echo " interface_name = The interface, the SLCAN module is connected to, i.e. /dev/ttyS0 or /dev/ttyUSB0.";
echo " = Needed for the slcan module only. The default is /dev/ttyUSB0.";
echo "Root permissions are needed for the first calling option (Enforced by socketCAN subsystem).";
}
# -v for version is deprecated 2020
while getopts :n:s:vVh opt
do
case ${opt} in
h) usage; exit 0;;
n) net=${OPTARG};;
s) ;; # unused
\?) usage; exit 1;;
v) version; exit 0;;
V) version; exit 0;;
esac
done
shift $((OPTIND - 1))
candevice=$1
case ${candevice} in
plx_pci)
# For the SJA1000 based PCI or PCI-Express CAN interface
modprobe plx_pci;
ip link set "can${net}" type can tq 250 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1;
ip link set "can${net}" up;;
esd_usb2)
# For an esd usb/2 CAN interface
modprobe esd_usb2;
ip link set "can${net}" type can tq 250 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1;
ip link set "can${net}" up;;
usb_8dev)
# For an 8devices usb2can CAN interface
modprobe usb_8dev;
ip link set "can${net}" type can tq 250 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1;
ip link set "can${net}" up;;
vcan)
# With this setup, CAN frames can be injected into vcan0 by a test
modprobe vcan;
ip link add type vcan;
ip link set "vcan${net}" up;;
slcan)
# For a serial line CAN device
# No support for devices, that need a setup of the baudrate yet
device=${2:-/dev/ttyUSB0};
modprobe slcan;
slcan_attach -f -s5 -o "${device}";
slcand "$(basename "${device}")";
ip link set "slcan${net}" up;;
beaglebone)
# For CAN interface on a BeagleBone
# The d_can driver is part of the kernel
ip link set "can${net}" type can bitrate 250000 sjw 1;
ip link set "can${net}" up;;
*)
echo "$(basename "$0") : invalid CAN interface ${1} net${net} device ${2:-(none)}"
echo;
usage;
exit 1
esac
# vim: set expandtab shiftwidth=4
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