Ping! I could really use some help for this. Any sensor API experts around who know about how this is supposed to work? Regards, Hans On 07/02/15 14:00, Hans Verkuil wrote: > When using V4L2_CID_IRIS/FOCUS/PAN/TILT/ZOOM_ABSOLUTE/RELATIVE, how do you know > when the new position has been reached? If this is controlled through a motor, > then it may take some time and ideally you would like to be able to get the > current absolute position (if the hardware knows) and whether the final position > has been reached or not. > > In addition, it should be possible to raise fault conditions. > > The way the ABSOLUTE controls are defined is ambiguous since it doesn't say > anything about what it returns when you read it: is that the current absolute > position, or the last set absolute position? I suspect it is the second one. > > If it is the second one, then I propose a V4L2_CID_IRIS_CURRENT control (and > ditto for the other variants) that is a read-only control returning the current > position with the same range and unit as the ABSOLUTE control. > > For the status/fault information I think the V4L2_CID_AUTO_FOCUS_STATUS comes > close, but it is too specific for auto focus. For manually positioning things > this might be more suitable: > > V4L2_CID_IRIS_STATUS bitmask > > V4L2_IRIS_STATUS_MOVING (or perhaps _BUSY?) > V4L2_IRIS_STATUS_FAILED > > And ditto for the other variants. > > Interaction between V4L2_CID_FOCUS_STATUS and AUTO_FOCUS_STATUS: > > If auto focus is enabled, then FOCUS_STATUS is always 0, if auto focus is > disabled, then AUTO_FOCUS_STATUS is always IDLE. > > Comments? Ideas? > > Regards, > > Hans > -- > To unsubscribe from this list: send the line "unsubscribe linux-media" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
