Hi Sylwester,
On Sunday 26 February 2012 17:57:55 Sylwester Nawrocki wrote:
> On 01/16/2012 10:33 PM, Sylwester Nawrocki wrote:
> > diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
> > index 012a296..0808b12 100644
> > --- a/include/linux/videodev2.h
> > +++ b/include/linux/videodev2.h
> > @@ -1662,6 +1662,34 @@ enum v4l2_exposure_auto_type {
> >
> > #define V4L2_CID_IRIS_ABSOLUTE
> > (V4L2_CID_CAMERA_CLASS_BASE+17)
> > #define V4L2_CID_IRIS_RELATIVE
> > (V4L2_CID_CAMERA_CLASS_BASE+18)
> >
> > +#define V4L2_CID_AUTO_FOCUS_START (V4L2_CID_CAMERA_CLASS_BASE+19)
> > +#define V4L2_CID_AUTO_FOCUS_STOP (V4L2_CID_CAMERA_CLASS_BASE+20)
> > +#define V4L2_CID_AUTO_FOCUS_STATUS (V4L2_CID_CAMERA_CLASS_BASE+21)
> > +enum v4l2_auto_focus_status {
> > + V4L2_AUTO_FOCUS_STATUS_IDLE = 0,
> > + V4L2_AUTO_FOCUS_STATUS_BUSY = 1,
> > + V4L2_AUTO_FOCUS_STATUS_SUCCESS = 2,
> > + V4L2_AUTO_FOCUS_STATUS_FAIL = 3,
> > +};
> > +
> > +#define V4L2_CID_AUTO_FOCUS_DISTANCE
> > (V4L2_CID_CAMERA_CLASS_BASE+22)
> > +enum v4l2_auto_focus_distance {
> > + V4L2_AUTO_FOCUS_DISTANCE_NORMAL = 0,
> > + V4L2_AUTO_FOCUS_DISTANCE_MACRO = 1,
> > + V4L2_AUTO_FOCUS_DISTANCE_INFINITY = 2,
> > +};
> > +
> > +#define V4L2_CID_AUTO_FOCUS_SELECTION
(V4L2_CID_CAMERA_CLASS_BASE+23)
> > +enum v4l2_auto_focus_selection {
> > + V4L2_AUTO_FOCUS_SELECTION_NORMAL = 0,
> > + V4L2_AUTO_FOCUS_SELECTION_SPOT = 1,
> > + V4L2_AUTO_FOCUS_SELECTION_RECTANGLE = 2,
> > +};
>
> I'd like to ask your advice, I've found those two above controls
> rather painful in use. After changing V4L2_CID_AUTO_FOCUS_SELECTION to
>
> #define V4L2_CID_AUTO_FOCUS_AREA (V4L2_CID_CAMERA_CLASS_BASE+23)
> enum v4l2_auto_focus_selection {
> V4L2_AUTO_FOCUS_SELECTION_ALL = 0,
> V4L2_AUTO_FOCUS_SELECTION_SPOT = 1,
> V4L2_AUTO_FOCUS_SELECTION_RECTANGLE = 2,
> };
>
> I tried use them with the M-5MOLS sensor driver where there is only
> one register for setting following automatic focus modes:
>
> NORMAL AUTO (single-shot),
> MACRO,
> INFINITY,
> SPOT,
> FACE_DETECTION
>
> The issue is that when V4L2_CID_AUTO_FOCUS_AREA is set to for example
> V4L2_AUTO_FOCUS_SELECTION_SPOT, none of the menu entries of
> V4L2_CID_AUTO_FOCUS_DISTANCE is valid.
>
> So it would really be better to use single control for automatic focus
> mode. A private control could handle that. But there will be more than
> one sensor driver needing such a control, so I thought about an
> additional header, e.g. samsung_camera.h in include/linux/ that would
> define reguired control IDs and menus in the camera class private id
> range.
>
> What do you think about it ?
One option would be to disable the focus area control when the focus distance
is set to a value different than normal (or the other way around). Control
change events could be used to report that to userspace. Would that work with
your hardware ?
--
Regards,
Laurent Pinchart
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