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# Shell version to provide a more friendly interface to the 'devadm' system
# to enable a device.

##################### FUNCTION DEFINITIONS #######################

# Call with the $0 of the script as a parameter; this commands writes the
# name of the directory containing the script to standard output.
# Example:
#	conf_path $0

conf_path () {
	set `which $1 2>/dev/null` X
	if [ $# -ne 2 ]; then
		echo .		# Assume the current directory.
		return 1
	fi
	set `expr $1 : '\(.*\)/.*'` X
	if [ $# -ne 2 ]; then
		echo .		# Must be in the current directory.
	else
		echo $1
	fi
	return 0
}

# Report a usage message to standard output, with the name of the script
# passed as the argument to this function.

usage () {
	echo $1 ":" Enable device entries
	echo "usage:\t[-f] [file ...] [[-e file ...] [-d file ...]] ..."
	echo "\tBy default, enable the named devices, reporting conflicts"
	echo "\t-d specifies that subsequent device names are to be disabled"
	echo "\t-e specifies that subsequent device names are to be enabled"
	echo "\t-f specifies that conflicting devices be automatically disabled"
}

# Confirm whether a value is set to a yes

isyes () {
	[ $1 = y -o $1 = Y ]
	return $?
}

# Read the 'sdevice' parameters for a device into shell globals

read_sdevice () {
	grep ^$1 $CONF_DIR/sdevice 2>/dev/null 1>&2
	if [ $? -ne 0 ]; then
		echo There is no 'sdevice' entry for $1 1>&2
		return 1
	fi

#	set `grep ^$1 $CONF_DIR/mdevice 2>/dev/null`
#	shift
#	MDEV_FUNCS=$1
#	MDEV_FLAGS=$2
#	MDEV_PREFIX=$3
#	MDEV_BLOCK_MAJ=$4
#	MDEV_CHAR_MAJ=$5
#	MDEV_MIN_MIN=$6
#	MDEV_MIN_MAX=$7
#	MDEV_DMA_CHAN=$8
#	MDEV_CPU_ID=$9
	
	set `grep ^$1 $CONF_DIR/sdevice 2>/dev/null`
	shift
	SDEV_CONFIG=$1
	SDEV_UNIT=$2
	SDEV_INT_PRI=$3
	SDEV_INT_TYPE=$4
	SDEV_INT_VECT=$5
	SDEV_IOA_LO=$6
	SDEV_IOA_HI=$7
	SDEV_CMA_LO=$8
	SDEV_CMA_HI=$9

	OLD_SDEV_CONFIG=$SDEV_CONFIG
	shift
	OLD_SDEV_INFO="$*"
	return 0
}

# Update the value of an sdevice entry parameter

set_enable_sdevice () {
	if isyes $OLD_SDEV_CONFIG; then
		if isyes $2; then
			return 0	# No effect
		fi
		# Disabling an entry is always legal...
	elif isyes $2; then
		# Verify that there is nothing conflicting with us
		BAD="`$HOME_DIR/devadm -I $CONF_DIR \
			 -S"$1 $2 $OLD_SDEV_INFO" -r`"
		if [ -n "$BAD" ]; then
			if [ -n "$FORCE_ENABLE" ]; then
				$HOME_DIR/idenable -d $BAD
				BAD="`$HOME_DIR/devadm -I $CONF_DIR \
					-S"$1 $2 $OLD_SDEV_INFO" -r`"
			fi
			if [ -n "$BAD" ]; then
				echo Enabling $1 will conflict with $BAD
				return 1
			fi
		fi
	else
		return 0		# No effect
	fi

	$HOME_DIR/devadm -I $CONF_DIR -S"$1 $2 $OLD_SDEV_INFO" -W
}

HOME_DIR=`conf_path $0`
CONF_DIR=$HOME_DIR/..

if [ $# -lt 1 ]; then
	usage $0 1>&2
	exit 100
fi

ENABLE=y

while [ $# -gt 0 ]; do
	ARG=$1; shift
	case $ARG in
	-d)	ENABLE=n
		;;

	-e)	ENABLE=y
		;;

	-f)	FORCE_ENABLE=1
		;;

	*)	read_sdevice $ARG || exit 1
		set_enable_sdevice $ARG $ENABLE
		;;
	esac
done

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