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Input: add detailed multi-touch finger data report protocol

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In order to utilize the full power of the new multi-touch devices, a
way to report detailed finger data to user space is needed. This patch
adds a multi-touch (MT) protocol which allows drivers to report details
for an arbitrary number of fingers.

The driver sends a SYN_MT_REPORT event via the input_mt_sync() function
when a complete finger has been reported.

In order to stay compatible with existing applications, the data
reported in a finger packet must not be recognized as single-touch
events. In addition, all finger data must bypass input filtering,
since subsequent events of the same type refer to different fingers.

A set of ABS_MT events with the desired properties are defined. The
events are divided into categories, to allow for partial implementation.
The minimum set consists of ABS_MT_TOUCH_MAJOR, ABS_MT_POSITION_X and
ABS_MT_POSITION_Y, which allows for multiple fingers to be tracked.
If the device supports it, the ABS_MT_WIDTH_MAJOR may be used to provide
the size of the approaching finger. Anisotropy and direction may be
specified with ABS_MT_TOUCH_MINOR, ABS_MT_WIDTH_MINOR and
ABS_MT_ORIENTATION. Devices with more granular information may specify
general shapes as blobs, i.e., as a sequence of rectangular shapes
grouped together by a ABS_MT_BLOB_ID. Finally, the ABS_MT_TOOL_TYPE
may be used to specify whether the touching tool is a finger or a pen.

Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Henrik Rydberg 2009-04-28 07:47:33 -07:00 committed by Dmitry Torokhov
parent 61994a61bc
commit 5e5ee686e3
2 changed files with 36 additions and 0 deletions
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13
drivers/input/input.c
View File

@ -33,6 +33,15 @@ MODULE_LICENSE("GPL");
* EV_ABS events which should not be cached are listed here.
*/
static unsigned int input_abs_bypass_init_data[] __initdata = {
ABS_MT_TOUCH_MAJOR,
ABS_MT_TOUCH_MINOR,
ABS_MT_WIDTH_MAJOR,
ABS_MT_WIDTH_MINOR,
ABS_MT_ORIENTATION,
ABS_MT_POSITION_X,
ABS_MT_POSITION_Y,
ABS_MT_TOOL_TYPE,
ABS_MT_BLOB_ID,
0
};
static unsigned long input_abs_bypass[BITS_TO_LONGS(ABS_CNT)];
@ -169,6 +178,10 @@ static void input_handle_event(struct input_dev *dev,
disposition = INPUT_PASS_TO_HANDLERS;
}
break;
case SYN_MT_REPORT:
dev->sync = 0;
disposition = INPUT_PASS_TO_HANDLERS;
break;
}
break;

23
include/linux/input.h
View File

@ -106,6 +106,7 @@ struct input_absinfo {
#define SYN_REPORT 0
#define SYN_CONFIG 1
#define SYN_MT_REPORT 2
/*
* Keys and buttons
@ -645,6 +646,17 @@ struct input_absinfo {
#define ABS_TOOL_WIDTH 0x1c
#define ABS_VOLUME 0x20
#define ABS_MISC 0x28
#define ABS_MT_TOUCH_MAJOR 0x30 /* Major axis of touching ellipse */
#define ABS_MT_TOUCH_MINOR 0x31 /* Minor axis (omit if circular) */
#define ABS_MT_WIDTH_MAJOR 0x32 /* Major axis of approaching ellipse */
#define ABS_MT_WIDTH_MINOR 0x33 /* Minor axis (omit if circular) */
#define ABS_MT_ORIENTATION 0x34 /* Ellipse orientation */
#define ABS_MT_POSITION_X 0x35 /* Center X ellipse position */
#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_MAX 0x3f
#define ABS_CNT (ABS_MAX+1)
@ -743,6 +755,12 @@ struct input_absinfo {
#define BUS_GSC 0x1A
#define BUS_ATARI 0x1B
/*
* MT_TOOL types
*/
#define MT_TOOL_FINGER 0
#define MT_TOOL_PEN 1
/*
* Values describing the status of a force-feedback effect
*/
@ -1312,6 +1330,11 @@ static inline void input_sync(struct input_dev *dev)
input_event(dev, EV_SYN, SYN_REPORT, 0);
}
static inline void input_mt_sync(struct input_dev *dev)
{
input_event(dev, EV_SYN, SYN_MT_REPORT, 0);
}
void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code);
static inline void input_set_abs_params(struct input_dev *dev, int axis, int min, int max, int fuzz, int flat)