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File name : detect_ppa
Content :
#!/bin/sh
# script for testing installation of a  PPA printer, v0.5  20000908
# (C) 2000 The pnm2ppa project

# Requires Linux 2.2.x kernels with parport autoprobe support.
# assumes all parallel ports are in the range 0-7  
# (as linux/include/parport.h sets PARPORT_MAX=8)

MODPROBE="/sbin/modprobe"
 
echo "*** Script for testing installation of PPA printers on Linux "
echo "    (requires 2.2.x kernel or later)"
supported="710 720 820 1000"

if  [ "$($MODPROBE -l parport_probe.o )" = "" ] ; then
    echo "*** kernel module parport_probe.o not found:"
    echo "*** IEEE-1284 autodetection not supported by this Linux kernel"
    exit 1
fi

if   ! $($MODPROBE -r  ) ; then
       echo "*** Error: cannot load/unload  kernel module(s) "
       echo "    You must run this script as root "
       exit 1
fi

# (re)probe the parport:
$MODPROBE -r lp
#  unload the lowlevel parport driver 
#(probably only  ARCH=pc is OK for PPA printers?)
for ARCH in amiga arc atari ax mfc3 pc ; do
    $MODPROBE -r parport_$ARCH
done
$MODPROBE  lp

if [ -e /proc/parport ] ; then
    found=0
    found_ppa=0
    ppa_printer=""
    for n in 0 1 2 3 4 5 6 7 ; do
	if [ -e  /proc/parport/$n/autoprobe ] ; then
            found=1
            echo " "
	    echo "Printer found at parallel port $n (usually /dev/lp$n )"
	    echo "IEEE-1284 autoprobe reports:"
	    cat /proc/parport/$n/autoprobe
            report=$(cat /proc/parport/$n/autoprobe)
            for printer in $supported ; do
		if $(echo $report |grep -e "DESKJET $printer" >/dev/null) ; then
		    found_ppa=1
		    text=" type=$printer, port=$n;"
		    ppa_printer=$ppa_printer$text
		fi
            done    
        fi
     done
     echo " "
     if [ "$found_ppa" = 0 ] ; then
	echo "No supported PPA printers attached to parallel port(s) were found"
	echo "(Make sure the printer's power cable is connected!!)"
     else
        echo "Supported PPA printers found on parallel ports:"
        echo $ppa_printer
        echo "printers on parallel port <n> are by default accessed by printing to /dev/lp<n>"
        echo "(unless this was explictly changed when loading the parport module)"
     fi   
else
   echo "*** Error:   /proc/parport does not exist:"
   echo "*** Cannot autoprobe IEEE-1284 parallel port devices."
   echo "(This  requires  2.2.x kernels with IEEE-1284 autoprobe support)"
   echo "A IEEE-1284  bidirectional parallel port cable is also required"
   echo "*** Possible causes of error:"
   echo "    1.   You are running an older Linux kernel (2.0.x or earlier)"
   echo "         -- this does NOT mean that you cannot make your PPA printer"
   echo "         work; however, this test script will not work."
   echo "    2.   Check that the printer is properly connected to a parallel"
   echo "         port, with a bidirectional IEEE-1284 cable, and is switched"
   echo "         on.  (If your printer works under MS Windows(tm), you have "
   echo "         the correct cable.)"
   echo "    3.   If \"lsmod\" shows that the lp, parport and parport_probe"
   echo "         modules are loaded, but not the architecture-dependent "
   echo "         module parport_pc, you may need to add a line "
   echo "                  alias parport_lowlevel parport_pc  "
   echo "         to your /etc/conf.modules file (needed for RedHat 6.1)."
   echo " "
   echo "         (modules for other architectures  exist, e.g., parport_ax for "
   echo "         Sun Ultra/AX, but it is not clear whether PPA printers "
   echo "         will work on such hardware (let us know if you try...))"
   exit 0
fi