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C.2. hotplug: input.rc

/etc/hotplug/input.rc


#!/bin/bash
#
# input.rc      This loads handlers for those input devices
#               that have drivers compiled in kernel
#               Currently stopping is not supported
#
# Best invoked via /etc/init.d/hotplug or equivalent, with
# writable /tmp, /usr mounted, and syslogging active.
#


PATH=/sbin:/bin:/usr/sbin:/usr/bin
PROCDIR=/proc/bus/input

# source function library
if [ -f /etc/init.d/functions ]; then
        . /etc/init.d/functions
elif [ -f /etc/rc.d/init.d/functions ]; then
        . /etc/rc.d/init.d/functions
fi

if [ -f /etc/hotplug/hotplug.functions ]; then
        . /etc/hotplug/hotplug.functions
fi

input_reset_state () {

    PRODUCT=
    NAME=
    PHYS=
    EV=
    KEY=
    REL=
    ABS=
    MSC=
    LED=
    SND=
    FF=

}

#
# "COLD PLUG" ... load input handlers for compile-in input drivers loaded
# before the OS could really handle hotplug, perhaps because /sbin or
# $HOTPLUG_DIR wasn't available or /tmp wasn't writable.  When/if the
# /sbin/hotplug program is invoked then, hotplug event notifications
# get dropped.  To make up for such "cold boot" errors, we synthesize
# all the hotplug events we expect to have seen already.  They can be
# out of order, and some might be duplicates.
#
input_boot_events ()
{
    if [ ! -r $PROCDIR/devices ]; then
            echo $"** can't synthesize input events - $PROCDIR/devices missing"
            return
    fi

    ACTION=add
    export ACTION

    export PRODUCT NAME PHYS EV KEY REL ABS MSC LED SND FF
    input_reset_state

    declare line

    #
    # the following reads from /proc/bus/input/devices. It is inherently
    # racy (esp. as this file may be changed by input.agent invocation)
    # but so far input devices do not appear in sysfs
    #
    while read line; do
        case "$line" in
            I:* )       # product ID
                eval "${line#I: }"
                PRODUCT=$Bus/$Vendor/$Product/$Version
            ;;
            N:* )       # name
                eval "${line#N: }"
                NAME="$Name"
            ;;
            P:* )       # Physical
                eval "${line#P: }"
                PHYS=$Phys
        ;;
            B:* )       # Controls supported
                line="${line#B: }"
                eval "${line%%=*}=\"${line#*=}\""
            ;;
            "" )        # End of block
                debug_mesg "Invoking input.agent"
                debug_mesg "PRODUCT=$PRODUCT"
                debug_mesg "NAME=$NAME"
                debug_mesg "PHYS=$PHYS"
                debug_mesg "EV=$EV"
                debug_mesg "KEY=$KEY"
                debug_mesg "REL=$REL"
                debug_mesg "ABS=$ABS"
                debug_mesg "MSC=$MSC"
                debug_mesg "LED=$LED"
                debug_mesg "SND=$SND"
                debug_mesg "FF=$FF"
                /etc/hotplug/input.agent < /dev/null
                input_reset_state
            ;;
        esac
    done < $PROCDIR/devices
}


# See how we were called.
case "$1" in
  start)
        input_boot_events
        ;;
  stop)
        : not supported currently
        ;;
  status)
        echo $"INPUT status for kernel: " `uname -srm`
        echo ''

        echo "INPUT devices:"
        if [ -r $PROCDIR/devices ]; then
            grep "^[INHP]:" $PROCDIR/devices
        else
            echo "$PROCDIR/devices not available"
        fi
        echo ''

        echo "INPUT handlers:"
        if [ -r $PROCDIR/handlers ]; then
            cat $PROCDIR/handlers
        else
            echo "$PROCDIR/handlers not available"
        fi

        echo ''

        ;;
  restart)
        # always invoke by absolute path, else PATH=$PATH:
        $0 stop && $0 start
        ;;
  *)
        echo $"Usage: $0 {start|stop|status|restart}"
        exit 1
esac