#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_MAX 0x3f
#define ABS_CNT (ABS_MAX+1)