s5k3l6xx: Integration time control

Exposure should be expressed in units of 1s/10000, so I will accept this only very reluctantly.

The exposure time is limited by the frame interval. Drivers should interpret the values as 100 µs units, where the value 1 stands for 1/10000th of a second, 10000 for 1 second and 100000 for 10 seconds.

https://www.kernel.org/doc/html/v4.10/media/uapi/v4l/extended-controls.html#camera-control-ids

I guess if we want to be all proper, then we won't have the control at all for some time, but it would be nice to see some affordances for changing the unit later.

mentioned in merge request !382 (merged)

added 26 commits

• 4c21487e...ca736e84 - 25 commits from branch Librem5:pureos/byzantium
• 791a4536 - s5k3l6xx: Integration time control

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It does get reset after taking a picture. I wonder when exactly.