Hi Sakari, On Thu, Aug 15, 2019 at 10:00:25AM +0300, Sakari Ailus wrote: > On Wed, Aug 14, 2019 at 10:28:12PM +0200, Jacopo Mondi wrote: > > Add documentation for the V4L2_CID_LOCATION camera control. The newly > > added read-only control reports the camera device mounting position. > > > > Signed-off-by: Jacopo Mondi <jac...@jmondi.org> > > --- > > .../media/uapi/v4l/ext-ctrls-camera.rst | 23 +++++++++++++++++++ > > 1 file changed, 23 insertions(+) > > > > diff --git a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst > > b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst > > index 51c1d5c9eb00..fc0a02eee6d4 100644 > > --- a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst > > +++ b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst > > @@ -510,6 +510,29 @@ enum v4l2_scene_mode - > > value down. A value of zero stops the motion if one is in progress > > and has no effect otherwise. > > > > +``V4L2_CID_LOCATION (integer)`` > > + This read-only control describes the camera location by reporting its > > + mounting position on the device where the camera is installed. This > > + control is particularly meaningful for devices which have a well > > defined > > + orientation, such as phones, laptops and portable devices as the camera > > + location is expressed as a position relative to the device intended > > + usage position. In example, a camera installed on the user-facing side > > s/In/For/ > > > + of a phone device is said to be installed in the > > ``V4L2_LOCATION_FRONT`` > > + position. > > + > > + > > + > > +.. flat-table:: > > + :header-rows: 0 > > + :stub-columns: 0 > > + > > + * - ``V4L2_LOCATION_FRONT`` > > + - The camera device is located on the front side of the device. > > + * - ``V4L2_LOCATION_BACK`` > > + - The camera device is located on the back side of the device. > > + > > + > > + > > .. [#f1] > > This control may be changed to a menu control in the future, if more > > options are required. > > There's an effective limit of 64 for menus. ACPI has less than ten > different locations for a device, I think 64 will be enough here. > > So I'd be actually in favour of switching to a menu.
Why ? As you explained yourself, it's a static read-only control, all it needs to report is a single value. -- Regards, Laurent Pinchart