input: mt: Add hovering distance axis
Touch devices capable of hovering, i.e., fingers detected a
distance from the surface, are not supported by the current
input MT protocol. This patch adds ABS_MT_DISTANCE, which may
be used to indicate the distance between the contact and the
surface.
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
diff --git a/include/linux/input.h b/include/linux/input.h
index 6de145d..b3a1e02 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -733,11 +733,12 @@
#define ABS_MT_BLOB_ID 0x38 /* Group a set of packets as a blob */
#define ABS_MT_TRACKING_ID 0x39 /* Unique ID of initiated contact */
#define ABS_MT_PRESSURE 0x3a /* Pressure on contact area */
+#define ABS_MT_DISTANCE 0x3b /* Contact hover distance */
#ifdef __KERNEL__
/* Implementation details, userspace should not care about these */
#define ABS_MT_FIRST ABS_MT_TOUCH_MAJOR
-#define ABS_MT_LAST ABS_MT_PRESSURE
+#define ABS_MT_LAST ABS_MT_DISTANCE
#endif
#define ABS_MAX 0x3f