PATCH: gspca-sn9c102-sensor-gain.patch

Hi,

Currently the sn9c102 gain control, only controls the digital gain in the sn9c102, but most sensors have an analog gain in the sensor, allowing for a much wider sensitivity range.

This patch adds support for the sensor gain for the tas5110 and ov6650 sensors. Note that both gains are controlled with a single v4l2 ctrl, as they are both gain. The ctrl now hs a range of 0-511, raising it one step at a time, will first raise the sensor gain 1 one its 0-255 scale and then the next step will raise the bridge gain on its 0-255 scale. Note that the bridge really has a 0-15 scale, so it only gets raised once every 32 steps
(of the full 0-511 scale).

This patch combined with the configurable exposure and autoexposure patch, makes my 2 sn9c102 cams work well in a wide variety of lighting conditions.

Regards,

Hans

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