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Commit df391e0e authored by Henrik Rydberg's avatar Henrik Rydberg Committed by Dmitry Torokhov
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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: default avatarHenrik Rydberg <rydberg@euromail.se>
Tested-by: default avatarStéphane Chatty <chatty@enac.fr>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 705a76d2

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)