add support for input devices

conf/system/udev/rules/10-paparazzi.rules

@@ -12,3 +12,6 @@ BUS=="usb", SYSFS{idVendor}=="7070", GROUP="plugdev"
 # FTDI 2232 parallel converter / Amontec JTAG-Tiny (access through libftdi)
 BUS=="usb",  SYSFS{idVendor}=="0403", SYSFS{idProduct}=="cff8", GROUP="plugdev"
 
+# make joysticks/gamepads readable on event interface (writeable for force feedback), see input_event.sh
+KERNEL=="event*", IMPORT{program}="input_event.sh %p", NAME="input/%k", GROUP="plugdev", MODE="0640"
+ENV{FF_DEVICE}=="1", MODE="0660"

conf/system/udev/rules/input_event.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# handle input/eventX devices for joystick devices
+# copy it to /lib/udev/input_event.sh
+
+# declarations from <linux/input>
+EV_ABS=0x03
+EV_FF=0x15
+ABS_X=0x00
+ABS_THROTTLE=0x06
+ABS_WHEEL=0x08
+
+ABS_ALL=$(( 1 << $ABS_X | 1 << $ABS_THROTTLE | 1 << $ABS_WHEEL))
+
+# get capabilities from parent input device
+parent=${1%%event*}
+EV="0x$(< /sys${parent}capabilities/ev)"
+ABS="0x$(< /sys${parent}capabilities/abs)"
+
+if (( $EV & (1 << $EV_ABS) )) && (( $ABS & $ABS_ALL )); then
+	if (( $EV & (1 << $EV_FF) )); then 
+		echo "FF_DEVICE=1";
+	else
+		echo "FF_DEVICE=0";
+	fi
+	exit  0
+fi
+
+# no joystick device
+exit 1