linux-kernel - Re: [PATCH 3/3] Input: Added thumb detection in BCM5974 multitouch driver

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Date:	Thu, 21 Nov 2013 10:20:24 +0100
From:	Henrik Rydberg <rydberg@...omail.se>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Friedrich Schöller 
	<linux@...oeller.se>
CC:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Input: Added thumb detection in BCM5974 multitouch
 driver

> On Wed, Nov 20, 2013 at 11:54:12PM +0100, Friedrich Schöller wrote:
>> Trackpads with integrated buttons are hard to use when the driver responds to
>> movements of the thumb that is resting or clicking on the surface of the
>> trackpad. This patch adds rudimentary support to filter out these touch events.
>>
>> The feature can be turned on via sysfs:
>> 	/sys/class/input/input[0-9]+/thumb_ignore:
>> 		Enables thumb detection
>> 		Values: 0/1
>> 	/sys/class/input/input[0-9]+/thumb_ratio_on:
>> 		When the ratio of ABS_MT_TOUCH_MINOR / ABS_MT_TOUCH_MAJOR
>> 		times 100 is smaller than this value the touch qualifies
>> 		as a thumb.
>> 	/sys/class/input/input[0-9]+/thumb_ratio_off:
>> 		When the ratio of ABS_MT_TOUCH_MINOR / ABS_MT_TOUCH_MAJOR
>> 		times 100 is bigger than this value the touch no longer
>> 		qualifies as a thumb.
>> 	/sys/class/input/input[0-9]+/thumb_y_on:
>> 		When ABS_MT_POSITION_Y is bigger than this value the touch
>> 		qualifies as a thumb.
>> 	/sys/class/input/input[0-9]+/thumb_y_off:
>> 		When ABS_MT_POSITION_Y is smaller than this value the touch
>> 		no longer qualifies as a thumb.
> 
> I'd rather this been implemented in userspace (synaptics and/or evdev X
> drivers).

And it has been in userland since at least 2008. It can be found in
input-synaptics, input-multitouch, input-mtrack, possibly more places.

Thanks,
Henrik

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