Hi Laurent,
Thank you for explaining the history behind some of the #define confusion
I've
seen between different versions of V4L2 and uvcvideo.
I eventually determined the following experimentally - the uvcvideo driver,
at
least for my camera (a logitech, USB id 046d:0809) supports two of the four
possible exposure modes. The others return I/O error - which I don't
understand,
if the camera doesn't support them, shouldn't it be EINVAL instead?
enum v4l2_exposure_auto_type {
V4L2_EXPOSURE_MANUAL = 0, /* Gives I/O error */
V4L2_EXPOSURE_AUTO = 1, /* works */
V4L2_EXPOSURE_SHUTTER_PRIORITY = 2, /* Gives I/O error */
V4L2_EXPOSURE_APERTURE_PRIORITY = 3 /* works */
};
Fortunately, the mode I wanted, aperture priority, works.
Regards,
Ben
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