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
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