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Input: add MT_TOOL_PALM

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Currently there are only two "tools" that can be specified by a multi-touch
driver: MT_TOOL_FINGER and MT_TOOL_PEN. In working with Elan (The touch
vendor) and discussing their next-gen devices it seems that it will be
useful to have more tools so that their devices can give the upper layers
of the stack hints as to what is touching the sensor.

In particular they have new experimental firmware that can better
differentiate between palms vs fingertips and would like to plumb a patch
so that we can use their hints in higher-level gesture soft- ware.  The
firmware on the device can reasonably do a better job of palm detection
because it has access to all of the raw sensor readings as opposed to just
the width/pressure/etc that are exposed by the driver.  As such, the
firmware can characterize what a palm looks like in much finer-grained
detail and this change would allow such a device to share its findings with
the kernel.

Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Charlie Mooney 2015-03-20 09:40:17 -07:00 • committed by Dmitry Torokhov
parent 09d042a2eb
commit a736775db6
2 changed files with 8 additions and 4 deletions
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3
include/uapi/linux/input.h
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@ -972,7 +972,8 @@ struct input_keymap_entry {
*/
#define MT_TOOL_FINGER 0
#define MT_TOOL_PEN 1
#define MT_TOOL_MAX 1
#define MT_TOOL_PALM 2
#define MT_TOOL_MAX 2
/*
* Values describing the status of a force-feedback effect