add triggerhappy hotkey daemon

Triggerhappy is a lightweight hotkey daemon that can launch arbitrary commands
on input events. It supports the hotplugging of devices and the processing of
key combinations.

Signed-off-by: Stefan Tomanek <stefan.tomanek+openwrt@wertarbyte.de>

utils/triggerhappy/files/triggerhappy-example.conf

@@ -0,0 +1,14 @@
+# This is an example configuration for the triggerhappy daemon (thd)
+# please note that every file to be processed must end in ".conf"
+#
+# To view a list of supported event codes, use "thd --listevents" or
+# "thd --dump /dev/input/event*"
+#
+# Format:
+# <eventcode> <value> <command>
+#
+# values for key events are 1 (pressed), 0 (released) or 2 (held)
+#
+## control an mpd instance
+# KEY_NEXTSONG		1	/usr/bin/mpc next
+# KEY_PREVSONG		1	/usr/bin/mpc prev

utils/triggerhappy/files/triggerhappy.hotplug

@@ -0,0 +1,15 @@
+#!/bin/sh
+THD_SOCKET=/tmp/triggerhappy.socket
+[ -S "$THD_SOCKET" ] || exit
+
+case "$ACTION" in
+	add)
+		DEVICE="/dev/$DEVNAME"
+		[ -c "$DEVICE" ] || exit
+		# offer device to triggerhappy daemon
+		/usr/sbin/th-cmd --socket "$THD_SOCKET" --add "$DEVICE"
+	;;
+        remove)
+		# nothing to do
+	;;
+esac

utils/triggerhappy/files/triggerhappy.init

@@ -0,0 +1,10 @@
+#!/bin/sh /etc/rc.common
+START=93
+
+start() {
+	/usr/sbin/thd --socket /tmp/triggerhappy.socket --triggers /etc/triggerhappy/triggers.d/ --daemon /dev/input/event*
+}
+
+stop() {
+	/usr/sbin/th-cmd --socket /tmp/triggerhappy.socket --quit
+}