Ericsson SH888 and IRDA (using irport)

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Using Ericsson SH888 with serial cabel and IRDA utils under Linux.

This is for older 2.4.x kernels and older IRDA-utils versions. This does not seem to work with newer kernels and newer Linux distributions.

Also works with Ericsson T68i

irtty/ircomm/irda/..etc worked well with kernel 2.2.12/2.2.13 and irda/irtty. (SuSE 6.3 worked fine)

Later kernel versions does not work, there has been some major changes with irda, that made it impossible to use SH888 through the serial cabel. Problems are:

that the speed is changed when connected, but through the serial cabel (and IR) only 9600bps is supported by SH888.
handshake problems on low-level driver? (hardware handshake is not used by SH888)

After a lot of experimenting, I gave up on irtty.c . Instead I tried irport.c which accesses the serial port hardware directly, and does not use the serial.o module/driver.

This actually works! :)

Before irport can be loaded:

add to /etc/modules.conf

    # IrDA
    alias char-major-161      ircomm-tty
    alias irda0               irport
    # alias tty-ldisc-11      irtty
    # set to IO and IRQ of the used serial port (here ttyS0) :
    options irport  io=0x3f8 irq=4

When compiling the kernel, remember to select fast RR's, since this will give a speed closer to 960 bytes/sec, and not 200-300 bytes/sec.
unload the serial.o modules ( modprobe -r serial ),
or if other serial ports have to be used, or the driver is compiled into the kernel,
try instead to disable the used port with setserial(in this example ttyS0) :
```
    setserial /dev/ttyS0 uart none port 0
   
```

SuSE init.d file:

For SuSE the followingl /sbin/init.d/irda could be used:

#!/bin/sh
#
# irda          This shell script takes care of starting and stopping
#               IrDA support

# Source function library.
#. /etc/rc.d/init.d/functions
. /etc/rc.config

PIDFILE=/var/run/irattach.pid

# Source IrDA networking configuration.
#. /etc/sysconfig/irda
IRDA=yes
DEVICE=/dev/ttyS0
DEVICE_IRPORT=irda0
DISCOVERY=yes

IRATTACH=/usr/local/sbin/irattach

# The echo return value for success (defined in /etc/rc.config).
RETURN=$rc_done_up

# Check that irda is up.
[ ${IRDA} = "no" ] && exit 0

[ -f $IRATTACH ] || exit 0

ARGS=
if $DONGLE ; then
	ARGS="$ARGS -d $DONGLE"
fi
if [ "$DISCOVERY" = "yes" ];then
	ARGS="$ARGS -s "
fi

PID=
test -f $PIDFILE && PID=`cat $PIDFILE`
 
# See how we were called.
case "$1" in
  irport|start)
        # Attach irda device 
	ARGS=-s
        echo -n "Starting IrDA: irport "
	# first remove serial driver!
	setserial $DEVICE uart none port 0
	#modprobe -r serial
	modprobe -r irtty
	modprobe irda
	modprobe irport
	echo 0 > /proc/sys/net/irda/debug
        if startproc -v ${IRATTACH} ${DEVICE_IRPORT} ${ARGS} ; then
             echo "IRDA: irattach is running"
             sleep 2
        else
             RETURN=$rc_failed_up
             echo "IRDA: could not start irattach"
        fi
	touch /var/lock/subsys/irda
        echo
        ;;

  serial)
        # Attach irda device 
        echo -n "Starting IrDA: "
	modprobe irda
	echo 1 > /proc/sys/net/irda/debug
        if startproc -v ${IRATTACH} ${DEVICE} ${ARGS} ; then
             echo "IRDA: irattach is running"
             sleep 2
        else
             RETURN=$rc_failed_up
             echo "IRDA: could not start irattach"
        fi
	touch /var/lock/subsys/irda
        echo
        ;;

  stop)
        # Stop service.
        echo -n "Shutting down IrDA: "
        if killproc $IRATTACH ; then
            echo "IRDA: irattach is down"
            while kill -0 $PID 2>/dev/null ; do sleep 2 ; done
        else
            RETURN=$rc_failed_up
 	fi
	rm -f /var/lock/subsys/irda
	modprobe -r irtty
	modprobe -r ircomm-tty
	modprobe -r ircomm
	modprobe -r irport
	setserial /dev/ttyS0 uart 16550A port 0x3F8 irq 4
        echo
        ;;
  status)
	#status $IRATTACH
        echo "IRDA: Checking for services: "
        ## Check status with checkproc(8), if process is running
        ## checkproc will RETURN with exit status 0.
	# -f $PID 
        checkproc $IRATTACH \
            && echo "IRDA: irattach is running" \
            || { echo "IRDA: services not available" ; \
                 RETURN=$rc_failed_up ; }
	;;
  restart|reload)
	$0 stop
	$0 start
	;;
  *)
        echo "Usage: irda {start|stop|status}"
        exit 1
esac

echo -e "$RETURN"
test "$RETURN" = "$rc_done_up" && exit 0
exit 1

Start with /sbin/init.d/irda start, and unload with /sbin/init.d/irda stop.

For other linux distributions the file must be adapted, and moved to appropriate location (debian: /etc/init.d/irda ).

Using minicom / xc / seyon /...

Set port to /dev/ircomm0, and set to a speed >9600. Usually a speed of 115200 will work fine, since it is a "virtual" speed. Setting speed to 9600 or less will not give a good perfomance.

PPP

Using pppd with deflate compression gives approx. 1.7 kbytes/sec, asuming the PPP-server provides deflate compression.

A simple chatscript for using the V110 protokol (requires connecting to a server with ISDN connection) /etc/ppp/chatscript:

#!/bin/sh
exec chat -v -r /var/log/ppp-chat.log \
REPORT CONNECT \
REPORT OK \
REPORT BUSY \
REPORT 'NO CARRIER' \
REPORT 'NO DIALTONE' \
TIMEOUT 25 \
'' 'ATZ' \
OK "AT+CBST=71" \
OK ATDT$PHONE \
ABORT 'NO CARRIER' \
ABORT 'BUSY' \
ABORT 'NO DIALTONE' \
ABORT 'WAITING' \
TIMEOUT 45 \
CONNECT

calling pppd:

  PHONE=NNNNNNNN
  pppd /dev/ircomm0 115200 connect /etc/ppp/chatscript \
     user PPPUSER noauth ....extra pppd options ....

Some links:

TuxMobil - Linux on laptops, PDAs, mobile phones ( http://tuxmobil.org )
Linux Mobile Phone Survey: SonyEricsson
Linux and the Toshiba 1620 laptop
IRDA homepage