From: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
To: Richard Purdie <richard.purdie@linuxfoundation.org>
Cc: openembedded-core@lists.openembedded.org
Subject: Re: Replacement for tslib?
Date: Thu, 01 Sep 2016 01:53:44 +0200 [thread overview]
Message-ID: <ly60qgxzp3.fsf@ensc-virt.intern.sigma-chemnitz.de> (raw)
In-Reply-To: <1472662673.29583.90.camel@linuxfoundation.org> (Richard Purdie's message of "Wed, 31 Aug 2016 17:57:53 +0100")
Richard Purdie <richard.purdie@linuxfoundation.org> writes:
>> tslib is more or less mandatory for resistive touchscreens but it was
>> removed some days ago. This breaks e.g. meta-qt5 layer which depends
>> on it.
>>
>> Is this removal really final (which would be really bad, because
>> resistive touchscreens are used e.g. in industrial environments)?
> [...]
> Are you sure the kernel interfaces that xinput is using don't work for
> qt4/qt5?
I am not aware of any way how /dev/input/eventX values can be calibrated
within the kernel.
Most capacitive touchscreens are doing this calibration in hardware
so that values correspond 1:1 to screen coordinates. But resistive
touchscreens return usually only the raw 10-12 bit ADC values in
ABS_X/Y.
Enrico
next prev parent reply other threads:[~2016-08-31 23:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-31 15:42 Replacement for tslib? Enrico Scholz
2016-08-31 16:57 ` Richard Purdie
2016-08-31 23:53 ` Enrico Scholz [this message]
2016-09-02 11:56 ` Burton, Ross
2016-09-02 12:34 ` Otavio Salvador
2016-09-02 12:43 ` Enrico Scholz
2016-09-02 12:54 ` Maxin B. John
2016-09-01 5:14 ` Mike Looijmans
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