linux-kernel - Re: [RFC 2/5] media: v4l2-ctrl: Document V4L2_CID

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Date:   Mon, 2 Sep 2019 10:06:57 +0200
From:   Pavel Machek <pavel@....cz>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        "open list:MEDIA INPUT INFRASTRUCTURE (V4L/DVB)" 
        <linux-media@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 2/5] media: v4l2-ctrl: Document V4L2_CID_LOCATION

Hi!

> > > Single integer. It's read-only, so it just reports the location.
> > > 
> > > It would be different if this was a writable control: then you need to
> > > know which locations are possible to set, and that requires a menu type.
> > > 
> > > But it doesn't make sense to set the location from software. However, the
> > > location might change as a result of other changes: e.g. if the camera
> > > has motor control of the tilt and the tilt changes from forward facing to
> > > downward facing, then the driver might change the location from FRONT
> > > to DOWN. A convoluted example perhaps, but this is just brainstorming.
> > 
> > There are phones with exactly such camera setup. And yes, it makes
> > sense to be writable in that case, as software can move the camera in
> > such case.
> 
> Out of curiosity, what phones are those ?

This one:

https://www.samsung.com/global/galaxy/galaxy-a80/

Best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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