Messages in this thread | | | Date | Wed, 12 Apr 2023 13:57:36 +0200 | Subject | Re: [libcamera-devel] [PATCH RFC 1/4] media: v4l2-ctrls: add lens group status controls for zoom and focus | From | Michael Riesch <> |
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Hi Sakari,
On 4/12/23 13:50, Sakari Ailus wrote: > Hi Michael, > > On Wed, Apr 12, 2023 at 10:00:26AM +0200, Michael Riesch wrote: >> - Different controls: If moving = (V4L2_CID_FOCUS_ABSOLUTE == current), >> then what happens if the application performs a >> V4L2_CID_FOCUS_RELATIVE with -3? current should reach 39, >> V4L2_CID_FOCUS_ABSOLUTE is still at 42, the lens is still moving from >> the application's point of view. > > Would there be a reason to implement both of these controls in a single > driver? AFAIU, the relative one should be used if there absolute value > isn't known to the driver.
Probably not, but on the other hand there is nothing the prevents a driver developer from doing so, right? Point is that should there be a driver which does implement both controls, we are in trouble AFAIU.
Best regards, Michael
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