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Input: multitouch - add tracking ID to the protocol

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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 <[email protected]>
Tested-by: Stéphane Chatty <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>
This commit is contained in:
Henrik Rydberg authored and Dmitry Torokhov committed 2009-05-23 09:53:18 -07:00
1 parent 705a76d2d2
commit df391e0eda
2 files changed
+2
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drivers/input/input.c
+1
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@@ -42,6 +42,7 @@ static unsigned int input_abs_bypass_init_data[] __initdata = {
ABS_MT_POSITION_Y,
ABS_MT_TOOL_TYPE,
ABS_MT_BLOB_ID,
ABS_MT_TRACKING_ID,
0
};
static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
include/linux/input.h
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@@ -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)