Add eye/left and eye/right devices;

Currently nobody returns data for them, though headset drivers could
start to provide poses estimated from the head pose and IPD info.

This also makes it easier to integrate eye tracking later.

src/api/l_headset.c

@@ -33,6 +33,8 @@ const char* Devices[] = {
   [DEVICE_HEAD] = "head",
   [DEVICE_HAND_LEFT] = "hand/left",
   [DEVICE_HAND_RIGHT] = "hand/right",
+  [DEVICE_EYE_LEFT] = "eye/left",
+  [DEVICE_EYE_RIGHT] = "eye/right",
   NULL
 };
 

src/modules/headset/headset.h

@@ -26,6 +26,8 @@ typedef enum {
   DEVICE_HEAD,
   DEVICE_HAND_LEFT,
   DEVICE_HAND_RIGHT,
+  DEVICE_EYE_LEFT,
+  DEVICE_EYE_RIGHT,
   MAX_DEVICES
 } Device;