Export device node as property.

There is currently no mapping between XI devices and physical devices other
than what can be extracted by parsing the Xorg logfile. Add new property
"Device Node" to the driver to export the open device file.

Server 1.11 and later standardises on this property name.

The client is responsible for detecting if the device is on the same host
and converting the data into a more useful format (e.g. sysfs path).

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

src/evdev.h

@@ -80,6 +80,10 @@
 #define MAX_VALUATORS 36
 #endif
 
+#ifndef XI_PROP_DEVICE_NODE
+#define XI_PROP_DEVICE_NODE "Device Node"
+#endif
+
 #define LONG_BITS (sizeof(long) * 8)
 
 /* Number of longs needed to hold the given number of bits */