#!/bin/sh
#
# VERSION 0.2
#
#  Author: Adalbert Prokop <adalbert.prokop.at.gmx.de>
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
#  This script was originally written to make the Tevion USB Card Reader work
#  together with Fedora Core 2.
#
#  This card reader uses LUNs 0-3 in the USB->SCSI emulation.
#  Those LUNs are not scanned by the FC2 kernel by default. It's more a quick
#  hack, than a good software, but it works fine for me. :)
#
#  cardreader by Adalbert Prokop <adalbert.prokop.at.gmx.de>
#  13.06.2004

sleep 2

declare -i DEVICECOUNT ID_LINE SCSI_HOST_LINE SCSI_HOST SCSI_CHANNEL SCSI_ID SCSI_LUN

# which names are to be created in /dev
CF=cardreadercf # compact flash
MS=cardreaderms # media stick
SM=cardreadersm # smart media
SD=cardreadersd # secure disk / mmc device

DEVICECOUNT=$(grep -c "Vendor: GENERIC  Model: Card Reader" /proc/scsi/scsi)
if [ $DEVICECOUNT -ge 4 ]; then
	# Enough! There are no more devices to detect!
	exit 0
fi

# Find first line with the right card reader descriptor
ID_LINE=$(grep -n "Vendor: GENERIC  Model: Card Reader" /proc/scsi/scsi | head -n 1 | cut -d: -f1)

if [ $ID_LINE -eq 0 ]; then
	echo "Error in $0. \$ID_LINE should never be zero!"
	exit 1
fi

# The preceeding line holds the SCSI host number
SCSI_HOST_LINE=$((${ID_LINE}-1))

# cut out the scsi? part (that is the second word)
SCSI_HOSTNAME=$(head -n $SCSI_HOST_LINE /proc/scsi/scsi | tail -n 1 | cut -d" " -f 2)

# delete the first four characters
SCSI_HOST=${SCSI_HOSTNAME#scsi}

SCSI_CHANNEL=0
SCSI_ID=0

# Finaly: add the other three devices with their LUNs! :)
for SCSI_LUN in 1 2 3; do
	echo "scsi add-single-device $SCSI_HOST $SCSI_CHANNEL $SCSI_ID $SCSI_LUN" > /proc/scsi/scsi
done

# Create symlinks to those devices

CF_DEV=$(basename $(readlink /sys/bus/scsi/devices/$SCSI_HOST\:$SCSI_CHANNEL\:$SCSI_ID\:0/block))
SM_DEV=$(basename $(readlink /sys/bus/scsi/devices/$SCSI_HOST\:$SCSI_CHANNEL\:$SCSI_ID\:1/block))
SD_DEV=$(basename $(readlink /sys/bus/scsi/devices/$SCSI_HOST\:$SCSI_CHANNEL\:$SCSI_ID\:2/block))
MS_DEV=$(basename $(readlink /sys/bus/scsi/devices/$SCSI_HOST\:$SCSI_CHANNEL\:$SCSI_ID\:3/block))

# remove old entries
rm -f /dev/$CF /dev/$SM /dev/$SD /dev/$MS

# make new links to first partition on each device
ln -s /dev/${CF_DEV}1 /dev/$CF
ln -s /dev/${SM_DEV}1 /dev/$SM
ln -s /dev/${SD_DEV}1 /dev/$SD
ln -s /dev/${MS_DEV}1 /dev/$MS

# if we're given a filename for a remover script, generate one.
# it will delete all symlinks to our scsi devices and remove entries in the scsi system
if [ "$REMOVER" ]; then
	cat << EOF > ${REMOVER}
#!/bin/bash
rm -f /dev/$CF /dev/$SM /dev/$SD /dev/$MS
for SCSI_LUN in 3 2 1 0; do
	echo "scsi remove-single-device $SCSI_HOST $SCSI_CHANNEL $SCSI_ID \$SCSI_LUN" > /proc/scsi/scsi
done
EOF
	chmod 755 ${REMOVER}
fi