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Added digital gain, set analog gain's minimum value to 0x20 per the datasheet, and prevented analog gain and integration time from being reset by frame mode register sets.
@dorota.czaplejewicz In the end I haven't implemented the exposure control since I'm not exactly sure how to map a single V4L2_CID_EXPOSURE value into coarse and fine integration times, and also what should be the range of such control (testing shows that somewhere around 4000 values stop influencing the image anymore)