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#!/bin/sh
#
# dahdi         This shell script takes care of loading and unloading \
#               DAHDI Telephony interfaces
# chkconfig: 2345 9 92
# description: The DAHDI drivers allow you to use your linux \
# computer to accept incoming data and voice interfaces
#
### BEGIN INIT INFO
# Provides:          dahdi
# Required-Start:    $remote_fs $local_fs
# Required-Stop:     $remote_fs $local_fs
# Should-Start:	     
# Should-Stop:       
# Default-Start:     1 2 3 5
# Default-Stop:      0 6
# Short-Description: Load and initialize Dahdi.
# Description:       Load and initialize the Dahdi telephony drivers
#                    which can be used by the Asterisk PBX system.
### END INIT INFO

. /etc/rc.status

initdir=/etc/init.d

# Don't edit the following values. Edit /etc/dahdi/init.conf instead.

DAHDI_CFG=/usr/sbin/dahdi_cfg
DAHDI_CFG_CMD="$DAHDI_CFG" # e.g: for a custom system.conf location

FXOTUNE=/sbin/fxotune

# The default syncer Astribank. Usually set automatically to a sane
# value by xpp_sync(1) if you have an Astribank. You can set this to an
# explicit Astribank (e.g: 01).
XPP_SYNC=auto

# The maximal timeout (seconds) to wait for udevd to finish generating 
# device nodes after the modules have loaded and before running dahdi_cfg. 
DAHDI_DEV_TIMEOUT=20

#
# Determine which kind of configuration we're using
#
system=suse  # assume redhat

[ -r /etc/sysconfig/dahdi ] && . /etc/sysconfig/dahdi

LOCKFILE=/var/lock/subsys/dahdi

# recursively unload a module and its dependencies, if possible.
# where's modprobe -r when you need it?
# inputs: module to unload.
# returns: the result from 
unload_module() {
	module="$1"
	line=`lsmod 2>/dev/null | grep "^$1 "`
	if [ "$line" = '' ]; then return; fi # module was not loaded

set -- $line
	# $1: the original module, $2: size, $3: refcount, $4: deps list
	mods=`echo $4 | tr , ' '`
	# xpp_usb keeps the xpds below busy if an xpp hardware is
	# connected. Hence must be removed before them:
	case "$module" in xpd_*) mods="xpp_usb $mods";; esac
	for mod in $mods; do
		# run in a subshell, so it won't step over our vars:
		(unload_module $mod) 
		# TODO: the following is probably the error handling we want:
		# if [ $? != 0 ]; then return 1; fi
	done
	rmmod $module
}

# have we loaded the modules 
running()
{	
	lsmod|grep -q "$1[^_-]"
}

# Initialize the Xorcom Astribank (xpp/) using perl utiliites:
xpp_startup() {
	# do nothing if there are no astribank devices:
	if ! grep -q connected /proc/xpp/xbuses 2>/dev/null; then return 0; fi

echo "Waiting for Astribank devices to initialize:"
	cat /proc/xpp/XBUS-[0-9]*/waitfor_xpds 2>/dev/null || true
	
	# overriding locales for the above two, as perl can be noisy
	# when locales are missing.
	# No register all the devices if they didn't auto-register:
	LC_ALL=C dahdi__registration on

# this one could actually be run after dahdi_cfg:
	LC_ALL=C xpp_sync "$XPP_SYNC"
}

hpec_start() {
	# HPEC license found
	if ! echo /var/lib/digium/licenses/HPEC-*.lic | grep -v '\*' | grep -q .; then
		return
	fi

# zaphpec_enable not installed in /usr/sbin
	if [ ! -f /usr/sbin/zaphpec_enable ]; then
		echo -n "Running zaphpec_enable: Failed"
		echo -n "."
		echo "  The zaphpec_enable binary is not installed in /usr/sbin."
		return
	fi

# zaphpec_enable not set executable
	if [ ! -x /usr/sbin/zaphpec_enable ]; then
		echo -n "Running zaphpec_enable: Failed"
		echo -n "."
		echo "  /usr/sbin/zaphpec_enable is not set as executable."
		return
	fi

# zaphpec_enable properly installed
	echo -n "Running zaphpec_enable: "
	/usr/sbin/zaphpec_enable 2> /dev/null
	if [ $? = 0 ]; then
		echo -n "done"
		echo "."
	else
		echo -n "Failed"
		echo -n "."
		echo "  This can be caused if you had already run zaphpec_enable, or if your HPEC license is no longer valid."
	fi
}

shutdown_dynamic() {
	if ! grep -q ' ZTD/' /proc/* 2>/dev/null; then return; fi

# we should only get here if we have dynamic spans. Right?
	$DAHDI_CFG_CMD -s
}

if [ ! -x "$DAHDI_CFG" ]; then
       echo "dahdi_cfg not executable"
       exit 0
fi

if [ ! -f /etc/dahdi/system.conf ]; then
	echo "/etc/dahdi/system.conf not found. Nothing to do."
       exit 0
fi

RETVAL=0

# See how we were called.
case "$1" in
  start)
	cat "/etc/dahdi/modules" | grep "^[^\#]" | {
		foundone=false
		echo -ne $"Loading DAHDI hardware modules:\n"
		while read line; do
			foundone=true
			echo -n "   ${line}: " 
			if modprobe $line 2> /dev/null; then
				echo -n "done"
			else
				echo -n "error"
			fi
		done
		echo -ne $"\n"
		if ! $foundone; then
			echo "There aren't any DAHDI hardware modules specified to "
			echo "load.  Please update /etc/dahdi/modules in order to "
			echo "specify the modules to load."
			exit 1
		fi
	}
	TMOUT=$DAHDI_DEV_TIMEOUT # max secs to wait
	while [ ! -d /dev/dahdi ] ; do
 		sleep 1
		TMOUT=`expr $TMOUT - 1`
		if [ $TMOUT -eq 0 ] ; then
			echo "Error: missing /dev/dahdi!"
			exit 1
		fi
	done
	sleep 3 # TODO: remove it

xpp_startup

if [ ! -e /proc/dahdi/1 ]; then
		echo "No hardware timing source found in /proc/dahdi, loading dahdi_dummy"
		modprobe dahdi_dummy 2> /dev/null
	fi

echo -n "Running dahdi_cfg: " 
	$DAHDI_CFG_CMD 2> /dev/null && echo -n "done"
	echo "."
	RETVAL=$?

if [ "$LOCKFILE" != '' ]; then
		[ $RETVAL -eq 0 ] && touch $LOCKFILE
	fi

if [ -x "$FXOTUNE" ] && [ -r /etc/fxotune.conf ]; then
		# Allowed to fail if e.g. Asterisk already uses channels:
		$FXOTUNE -s || : 
	fi

hpec_start
	;;
  stop)
	# Unload drivers
	#shutdown_dynamic # FIXME: needs test from someone with dynamic spans
	echo -ne $"Unloading DAHDI hardware modules: " 
	if unload_module dahdi; then
		echo -n "done"
	else
		echo -n "error"
	fi
	if [ "$LOCKFILE" != '' ]; then
		[ $RETVAL -eq 0 ] && rm -f $LOCKFILE
	fi
	;;
  unload)
	unload_module dahdi
	;;
status)
        echo -n "Checking for dahdi ..."
	## Check status with running(), if modules are loaded running
	## running() will return with exit status 0.

# Return value is slightly different for the status command:
	# 0 - service up and running
	# 1 - service dead, but /var/run/  pid  file exists
	# 2 - service dead, but /var/lock/ lock file exists
	# 3 - service not running (unused)
	# 4 - service status unknown :-(
	# 5--199 reserved (5--99 LSB, 100--149 distro, 150--199 appl.)
	if running dahdi; then
	  echo -n " modules loaded."
	  rc_failed 0
	else
	  echo -n " no modules loaded."
	  rc_failed 3
	fi

# NOTE: rc_status knows that we called this init script with
	# "status" option and adapts its messages accordingly.
	rc_status -v
	;;
  restart|force-reload)
	$0 stop
	$0 start
	;;
  reload)
	echo -n "Rerunning dahdi_cfg: "
	$DAHDI_CFG_CMD 2> /dev/null && echo -n "done"
	echo "."
	RETVAL=$?
	;;
  *)
	echo "Usage: dahdi {start|stop|restart|reload|unload|status}"
	exit 1
esac

exit $RETVAL