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From: Hans Verkuil <hverkuil@xs4all.nl>
To: Florian Echtler <floe@butterbrot.org>, linux-media@vger.kernel.org
Cc: modin@yuri.at, benjamin.tissoires@redhat.com, hans.verkuil@cisco.com
Subject: Re: [RFC] [sur40] mapping of sensor parameters to V4L2?
Date: Mon, 9 Jan 2017 15:57:01 +0100	[thread overview]
Message-ID: <93af6f64-0cb0-bed7-8ff2-9c82b171b6b9@xs4all.nl> (raw)
In-Reply-To: <alpine.DEB.2.10.1701031346040.18874@butterbrot>

On 01/03/2017 01:57 PM, Florian Echtler wrote:
> Hi everyone,
> 
> next chapter in the neverending story of reverse-engineering the SUR40:
> 
> I've identified a couple of internal LCD panel registers which control 
> some aspects of the built-in image sensor. In particular, these are called 
> "Video Voltage", "Video Bias", and "IR Illumination Level".
> 
> Now, I have two questions:
> 
> - Video Voltage & Bias seem to affect the sensor gain. Does anyone with 
> extensive background knowledge of image sensors want to venture a guess 
> what the exact relation is? My own interpretation would be that Video 
> Voltage is the actual amplifier gain and Video Bias is the black level...
> 
> - Is there a sensible mapping of these values to V4L2 controls? Should I 
> pick something from the USER class, or from CAMERA, or FLASH, or ...

I think it would be best to add a control class for touch device and add
these controls there.

It's pretty specific to such devices, so that would make sense.

Regards,

	Hans


      reply	other threads:[~2017-01-09 14:57 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-03 12:57 [RFC] [sur40] mapping of sensor parameters to V4L2? Florian Echtler
2017-01-09 14:57 ` Hans Verkuil [this message]

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