path: root/include
diff options
authorHenrik Rydberg <>2009-05-23 09:51:20 -0700
committerDmitry Torokhov <>2009-05-23 09:53:18 -0700
commitdf391e0eda1e678add56a8e34226edf05d89af6a (patch)
tree87d375cecc32a0784d42adb6b4e8b04fbf70dadb /include
parent705a76d2d22a2824f45f07d023a380293554e989 (diff)
Input: multitouch - add tracking ID to the protocol
There are a few multi-touch devices that support finger tracking well in hardware, Stantum being the prime example. By exposing the tracking ID in the MT protocol, evdev bandwidth and cpu usage in user space can be reduced. This patch adds the ABS_MT_TRACKING_ID to the MT protocol. Signed-off-by: Henrik Rydberg <> Tested-by: St├ęphane Chatty <> Signed-off-by: Dmitry Torokhov <>
Diffstat (limited to 'include')
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/input.h b/include/linux/input.h
index 0e6ff5de3588..6fed4f6a9c9e 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -656,6 +656,7 @@ struct input_absinfo {
#define ABS_MT_POSITION_Y 0x36 /* Center Y ellipse position */
#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_MAX 0x3f
#define ABS_CNT (ABS_MAX+1)