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

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Date:	Wed, 20 Nov 2013 21:05:51 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Friedrich Schöller <linux@...oeller.se>
Cc:	Henrik Rydberg <rydberg@...omail.se>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Input: Added thumb detection in BCM5974 multitouch
 driver

Hi Friedrich,

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).

Thanks.

-- 
Dmitry
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