Cross Reference: /systemd/src/udev/keymap/findkeyboards

	findkeyboards revision 3e2147858f21943d5f4a781c60f33ac22c6096ed
#!/bin/sh -e
# Find "real" keyboard devices and print their device path.
# Author: Martin Pitt <martin.pitt@ubuntu.com>
#
# Copyright (C) 2009, Canonical Ltd.
#
# 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.

# returns OK if $1 contains $2
strstr() {
        [ "${1#*$2*}" != "$1" ]
}

# returns OK if $1 contains $2 at the beginning
str_starts() {
        [ "${1#$2*}" != "$1" ]
}

str_line_starts() {
        while read a; do str_starts "$a" "$1" && return 0;done
        return 1;
}

# print a list of input devices which are keyboard-like
keyboard_devices() {
        # standard AT keyboard
        for dev in `udevadm trigger --dry-run --verbose --property-match=ID_INPUT_KEYBOARD=1`; do
                walk=`udevadm info --attribute-walk --path=$dev`
                env=`udevadm info --query=env --path=$dev`
                # filter out non-event devices, such as the parent input devices which have no devnode
                if ! echo "$env" | str_line_starts 'DEVNAME='; then
                        continue
                fi
                if strstr "$walk" 'DRIVERS=="atkbd"'; then
                        echo -n 'AT keyboard: '
                elif echo "$env" | str_line_starts 'ID_USB_DRIVER=usbhid'; then
                        echo -n 'USB keyboard: '
                else
                        echo -n 'Unknown type: '
               fi
                       udevadm info --query=name --path=$dev
        done

        # modules
        module=$(udevadm trigger --verbose --dry-run --subsystem-match=input --attr-match=name='*Extra Buttons')
        module="$module
        $(udevadm trigger --verbose --dry-run --subsystem-match=input --attr-match=name='*extra buttons')"
        module="$module
        $(udevadm trigger --verbose --dry-run --subsystem-match=input --attr-match=name='Sony Vaio Keys')"
        for m in $module; do
                for evdev in $m/event*/dev; do
                        if [ -e "$evdev" ]; then
                                echo -n 'module: '
                                udevadm info --query=name --path=${evdev%%/dev}
                        fi
                done
        done
}

keyboard_devices