#!/bin/sh

# This script loads a specified kernel module (e.g. windrvr6).
# To reload the kernel module on each boot, run the script from the
# /etc/rc.d/rc.local file on the target Linux platform.

if test -z "$1" ; then
	echo "Usage: $0 <module name> [use_udev(yes|no|auto)]"
	exit 1
fi

module_base_name=`basename $1 | sed 's/\.o//' | sed 's/\.ko//'`
use_udev=$2

usb_module_base_name=$module_base_name"_usb"
has_usb_module=0

modules_dir="/lib/modules/`uname -r`/kernel/drivers/misc"
if [ ! -d $modules_dir ] ; then
	modules_dir="/lib/modules/misc"
fi

if [ -d $modules_dir ] ; then
	has_usb_module=`ls $modules_dir | grep -cw $usb_module_base_name`
fi

if test -z "$2" ; then
	use_udev="auto";
fi

if test "$use_udev" = "auto" ; then
	is_udevd=`ps -ef | grep udevd`
	major_num=`uname -r | cut -d "." -f2`
	minor_num=`uname -r | cut -d "." -f3 | cut -d "-" -f1`
	
	if [ ! "$is_udevd" ] ; then
		use_udev="no";
	elif [ "$major_num$minor_num" -ge "613" ] ; then
		use_udev="no";
	else
		use_udev="yes";
	fi;
fi

#remove old module(s)
need_remove=`/sbin/lsmod | grep -cw $module_base_name`
if [ $need_remove -ne 0 ] ; then
	/sbin/rmmod $module_base_name || exit 1
fi 

if [ $has_usb_module -ne 0 ] ; then
	need_usb_remove=`/sbin/lsmod | grep -cw  $usb_module_base_name`
	if [ $need_usb_remove -ne 0 ] ; then
		/sbin/rmmod $usb_module_base_name || exit 1
	fi
fi

if test $use_udev = "no" ; then 
	#remove stale nodes
	rm -f /dev/$module_base_name
fi

#rebuild dependency tree to include windriver's module(s)
/sbin/depmod

if [ $has_usb_module -ne 0 ] ; then
	/sbin/modprobe $usb_module_base_name || exit 1
fi
/sbin/modprobe $module_base_name || exit 1

if test $use_udev = "no" ; then 
	major=`grep -w $module_base_name /proc/devices | cut -f1 -d" "`
	mknod /dev/$module_base_name c $major 0 
fi