Add controls to query camera read only paramters

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Hi Everyone,

I need suggestions with regard to adding controls to query camera read
only parameters (e.g maxZoom/maxExposureCompensation) as needed by
Android Camera API[1].

What is in my mind is to add a customized camera control ID for each
parameter I want to query and return EACCES when being used wit
VIDIOC_S_EXT_CTRLS.

Or, I can port the compound controls [2] patch and then I only need to
add one customized control ID.

Comments? What is the better way to do this?

[1] http://developer.android.com/reference/android/hardware/Camera.Parameters.html
[2]http://comments.gmane.org/gmane.comp.video.linuxtv.scm/19545

-- 
Regards,
Bin
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