Input: multitouch - add tracking ID to the protocol (df391e0e) · Commits · 戴 / test

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 <rydberg@euromail.se> Tested-by:

Stéphane Chatty <chatty@enac.fr> Signed-off-by:

Dmitry Torokhov <dtor@mail.ru>

drivers/input/input.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

+1 −0

Original line number	Diff line number	Diff line
		@@ -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)

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