On Tue, Feb 20, 2018 at 12:07:56AM +0300, Alexey Kryukov wrote:
> Hi,
> 
> I am trying to get EOS M2 supported in libgphoto2. Basically the camera
> looks perfectly controllable over USB (better than its descendants),
> but some tweaks are needed, and I'd like to discuss them here before
> submitting a patch.
> 
> First of all, the camera requires regetting device info after setting
> the remote mode to 0x15. For this reason currently the shooting related
> commands work only every other time: get device info while the remote
> mode is still 0 -- set the remote mode to 0x15 -- report caption not
> supported -- exit -- get device info, this time with the remote mode
> 0x15 -- successfully capture an image -- reset the remote mode to 0,
> and so on. Of course there is no problem to insert one more
> ptp_getdeviceinfo() call into camera_init(), but this doesn't look
> optimal, as the function is later called once more from
> camera_prepare_canon_eos_capture(). So might it be possible to somehow
> minimize the number of those calls?

But this is the way I would go here. Can you just try?

FWIW, do you get an PTP event of PTP_EC_DeviceInfoChanged (4008) ?
 
> Second, when accessing the M2 I get multiple error messages:
> "halfsize 0 is not expected 278". It seems the camera indeed
> produces a useless PTP_DPC_CANON_EOS_FocusInfoEx field, filled
> with zeroes. Since this is not actually an error and the message
> is quite irritating, I'd like to know if it would be OK to disable it
> just for one particular camera.

If this annoying, just comment it out.

> Also, my previous patch for EOS M non-focus doesn't work here and needs
> to be updated. It would be interesting to have a look at logs of other
> EOS M* cameras to see if they behave differently at this point.

:/ I just have an M10 for testing.

Ciao, Marcus

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