linux-kernel - Re: [PATCH 6/6] Input: elantech

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Date:	Fri, 19 Aug 2011 14:41:01 +0200
From:	Éric Piel <E.A.B.Piel@...elft.nl>
To:	JJ Ding <jj_ding@....com.tw>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Aaron Huang <aaron_huang@....com.tw>,
	Tom Lin <tom_lin@....com.tw>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Chase Douglas <chase.douglas@...onical.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Alessandro Rubini <rubini@...l.unipv.it>
Subject: Re: [PATCH 6/6] Input: elantech - add v3 hardware support

Op 19-08-11 14:13, Seth Forshee schreef:
> On Fri, Aug 19, 2011 at 04:29:57PM +0800, JJ Ding wrote:
>>> You should only report the ABS_[XY] coordinates when fingers != 0. The
>>> xorg synaptics module sees the values reported in that case as
>>> legitimate. This is causing me to see strange behaviors when scrolling
>>> with two-finger drags.
>> AFAIK, though v2 and v3 differ in packet format, they really report the
>> same data to the userspace. In this version of v3 support, I even try to
>> make v2 and v3 report all the data in the same sequnce. If you're seeing
>> this issue, maybe we should do the same with v2?
>
> Actually neither v1 nor v2 reports ABS_[XY] unless fingers != 0. In v2
> the reporting is in a switch statement on the number of fingers, and 0
> is unhandled.

Yes, in other words, in the case of v1 or v2, the switch(fingers) does 
nothing if fingers == 0.

Maybe you could do put these 3 lines inside a "if (fingers != 0)":
+	input_report_abs(dev, ABS_X, x1);
+	input_report_abs(dev, ABS_Y, y1);
+	elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);

Éric
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