rc.serial

8250/16550串口芯片在Linux下的驱动（Ver5.5）

#
# /etc/rc.serial 
#	Initializes the serial ports on your system
#
# chkconfig: 2345 50 75
# description: This initializes the settings of the serial port
#
# FILE_VERSION: 20000519
#
# Distributed with setserial and the serial driver.  We need to use the
# FILE_VERSION field to assure that we don't overwrite a newer rc.serial 
# file with a newer one.
# 
# XXXX For now, the autosave feature doesn't work if you are
# using the multiport feature; it doesn't save the multiport configuration
# (for now).  Autosave also doesn't work for the hayes devices.  
# Will fix later...
#
#

RCLOCKFILE=/var/lock/subsys/serial
DIRS="/lib/modules/`uname -r`/misc /lib/modules /usr/lib/modules ."
PATH=/bin:/sbin:/usr/bin
DRIVER=serial
DRIVER_NAME=serial
MODULE_REGEXP="serial\b"

if test -d /dev/tts ; then
	ALLDEVS="/dev/tts/?"
	if /bin/ls /dev/tts/?? >& /dev/null ; then
		ALLDEVS="$ALLDEVS /dev/tts/??"
	fi
else
	ALLDEVS="/dev/ttyS?"
	if /bin/ls /dev/ttyS?? >& /dev/null ; then
		ALLDEVS="$ALLDEVS /dev/ttyS??"
	fi
fi

SETSERIAL=""
if test -x /bin/setserial ; then
	SETSERIAL=/bin/setserial
elif test -x /sbin/setserial ; then
	SETSERIAL=/sbin/setserial
fi

#
# See if the serial driver is loaded
#
LOADED=""
if test -f /proc/devices; then
	if grep -q " ttyS$" /proc/devices || grep -q " tts/" /proc/devices; then
		LOADED="yes"
	else
		LOADED="no"
	fi
fi

#
# Find the serial driver
#
for i in $DIRS
do
	if test -z "$MODULE" -a -f $i/$DRIVER.o ; then
		MODULE=$i/$DRIVER.o
	fi
done

if ! test -f /proc/modules ; then
	MODULE=""
fi

#
# Handle System V init conventions...
#
case $1 in
start)
	action="start";
	;;
stop)
	action="stop";
	;;
restart|reload)
	$0 stop
	$0 start
	exit $?
	;;
status)
	module=`grep $MODULE_REGEXP /proc/modules | awk '{print $1}'`
	if test -n "$module" ; then 
	    echo "The $DRIVER driver is loaded."
	    exit 0
	fi
	if test "$LOADED" = "yes" ; then
	    echo "The $DRIVER driver is compiled into the kernel"
	    exit 0
        fi
	echo "The $DRIVER driver is not loaded."
	exit 1
	;;
*)
	action="start";
esac

if test $action  = stop ; then
	if test -n ${SETSERIAL} -a "$LOADED" != "no" -a \
           `head -1 /etc/serial.conf`X = "###AUTOSAVE###X" ; then
		echo -n "Saving state of serial devices... "
		grep "^#" /etc/serial.conf > /etc/.serial.conf.new
		${SETSERIAL} -G -g ${ALLDEVS} >> /etc/.serial.conf.new
		mv /etc/serial.conf /etc/.serial.conf.old
		mv /etc/.serial.conf.new /etc/serial.conf
		echo "done."
	fi
	if test -n $MODULE ; then
		module=`grep $MODULE_REGEXP /proc/modules | awk '{print $1}'`
		if test -z "$module" ; then 
			echo "The $DRIVER_NAME driver is not loaded."
			rm -f ${RCLOCKFILE}
			exit 0
		fi
		if rmmod $module ; then :; else 
			echo "The $DRIVER_NAME driver could NOT be unloaded."
			exit 1;
		fi
		echo "The $DRIVER_NAME driver has been unloaded."
	fi
	rm -f ${RCLOCKFILE}
	exit 0
fi

#
# If not stop, it must be a start....
#

if test -n $MODULE -a "$LOADED" != "yes" ; then 
	if insmod -fm $MODULE $DRIVER_ARG \
		> /tmp/$DRIVER.map 2> /tmp/$DRIVER.$$; then :; 
	else
		echo "Couldn't load $DRIVER_NAME driver."
		echo "See error logs in /tmp/$DRIVER.$$"
		exit 1
	fi
	/bin/rm -f /tmp/$DRIVER.$$
fi

if test -f /etc/serial.conf ; then
        if test -n ${SETSERIAL} ; then
		grep -v ^# < /etc/serial.conf | while read device args
		do
		    ${SETSERIAL} -z $device $args
		done 
	fi
else
	echo "###AUTOSAVE###" > /etc/serial.conf
fi

touch ${RCLOCKFILE}
${SETSERIAL} -bg ${ALLDEVS}