From: Benjamin Tissoires <benjamin.tissoires@xxxxxxx>
Microsoft published a new version of their multitouch specification.
They introduced a new multitouch field: MT_CENTER_X|Y.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxx>
---
Documentation/input/multi-touch-protocol.txt | 14 ++++++++++++--
include/linux/input.h | 8 +++++---
2 files changed, 17 insertions(+), 5 deletions(-)
diff --git a/Documentation/input/multi-touch-protocol.txt b/Documentation/input/multi-touch-protocol.txt
index 543101c..289951c 100644
--- a/Documentation/input/multi-touch-protocol.txt
+++ b/Documentation/input/multi-touch-protocol.txt
@@ -254,11 +254,21 @@ between. In such cases, the range of ABS_MT_ORIENTATION should be [0, 1]
ABS_MT_POSITION_X
-The surface X coordinate of the center of the touching ellipse.
+The surface X coordinate of the point the user intended to touch.
ABS_MT_POSITION_Y
-The surface Y coordinate of the center of the touching ellipse.
+The surface Y coordinate of the point the user intended to touch.
+
+ABS_MT_CENTER_X
+
+The surface X coordinate of the center of the touching ellipse. This field is
+introduced by Windows 8 multitouch protocol.
+
+ABS_MT_CENTER_Y
+
+The surface Y coordinate of the center of the touching ellipse. This field is
+introduced by Windows 8 multitouch protocol.
ABS_MT_TOOL_TYPE
diff --git a/include/linux/input.h b/include/linux/input.h
index a816714..5b0dfe2 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -806,18 +806,20 @@ struct input_keymap_entry {
#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */
#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */
#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
-#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
-#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
+#define ABS_MT_POSITION_X 0x35 /* X the user intended to touch */
+#define ABS_MT_POSITION_Y 0x36 /* Y the user intended to touch */
#define ABS_MT_TOOL_TYPE 0x37 /* Type of touching device */
#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 */
+#define ABS_MT_CENTER_X 0x3c /* Center X ellipse position */
+#define ABS_MT_CENTER_Y 0x3d /* Center Y ellipse position */
#ifdef __KERNEL__
/* Implementation details, userspace should not care about these */
#define ABS_MT_FIRST ABS_MT_TOUCH_MAJOR
-#define ABS_MT_LAST ABS_MT_DISTANCE
+#define ABS_MT_LAST ABS_MT_CENTER_Y
#endif
#define ABS_MAX 0x3f
--
1.7.7.6
--
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