From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Jacopo Mondi <jacopo@jmondi.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
"open list:MEDIA INPUT INFRASTRUCTURE (V4L/DVB)"
<linux-media@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: [RFC 2/5] media: v4l2-ctrl: Document V4L2_CID_LOCATION
Date: Mon, 2 Sep 2019 11:53:03 +0300 [thread overview]
Message-ID: <20190902085303.GG4777@pendragon.ideasonboard.com> (raw)
In-Reply-To: <20190902082739.GE15850@amd>
Hi Pawel,
On Mon, Sep 02, 2019 at 10:27:39AM +0200, Pavel Machek wrote:
> On Mon 2019-09-02 11:19:42, Laurent Pinchart wrote:
> > On Mon, Sep 02, 2019 at 10:06:57AM +0200, Pavel Machek wrote:
> >>>>> 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/
> >
> > Interesting device. I'm not sure we should control that through a
> > location control though, as it seems there's more than the rotation of
> > the camera involved. In any case I wouldn't care about it for now, and
> > turn the location control from read-only to read-write later if needed.
> > We need more information and more thought to support that use case.
>
> Well, the mechanism is there just to rotate the camera.
But we don't know how it's implemented, it could be heavily
firmware-based for instance.
> Anyway, that phone is probably nowhere close to having mainline
> support, so...
If we need to support such a device in the future (and I hope we will
:-)) then I'm totally fine expanding the features of the location
control. My only concern is that I don't want to over-design it right
now without having enough information about the hardware that would make
use of it.
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2019-09-02 8:53 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 20:28 [RFC 0/5] media: v4l2-ctrls: Add camera 'location' support Jacopo Mondi
2019-08-14 20:28 ` [RFC 1/5] media: dt-bindings: Document 'location' property Jacopo Mondi
2019-08-14 22:40 ` Laurent Pinchart
2019-08-15 6:56 ` Sakari Ailus
2019-08-15 12:55 ` Laurent Pinchart
2019-08-15 12:55 ` Jacopo Mondi
2019-08-15 12:58 ` Laurent Pinchart
2019-09-01 17:24 ` Pavel Machek
2019-09-02 8:02 ` Laurent Pinchart
2019-09-02 8:11 ` Pavel Machek
2019-08-14 20:28 ` [RFC 2/5] media: v4l2-ctrl: Document V4L2_CID_LOCATION Jacopo Mondi
2019-08-14 22:43 ` Laurent Pinchart
2019-08-15 12:58 ` Jacopo Mondi
2019-08-15 14:10 ` Hans Verkuil
2019-08-15 14:14 ` Hans Verkuil
2019-08-15 14:34 ` Jacopo Mondi
2019-08-15 14:40 ` Hans Verkuil
2019-08-15 15:12 ` Sakari Ailus
2019-09-01 17:24 ` Pavel Machek
2019-09-02 8:00 ` Laurent Pinchart
2019-09-02 8:06 ` Pavel Machek
2019-09-02 8:19 ` Laurent Pinchart
2019-09-02 8:27 ` Pavel Machek
2019-09-02 8:53 ` Laurent Pinchart [this message]
2019-09-02 9:41 ` Jacopo Mondi
2019-08-15 7:00 ` Sakari Ailus
2019-08-15 12:59 ` Laurent Pinchart
2019-08-15 13:08 ` Sakari Ailus
2019-08-15 13:10 ` Laurent Pinchart
2019-08-15 13:15 ` Sakari Ailus
2019-08-15 13:19 ` Laurent Pinchart
2019-08-15 13:30 ` Hans Verkuil
2019-08-15 13:48 ` Laurent Pinchart
2019-08-15 14:02 ` Jacopo Mondi
2019-08-14 20:28 ` [RFC 3/5] media: v4l2-ctrls: Add support for V4L2_CID_LOCATION Jacopo Mondi
2019-08-14 22:53 ` Laurent Pinchart
2019-08-15 13:02 ` Jacopo Mondi
2019-08-15 13:03 ` Laurent Pinchart
2019-08-15 13:41 ` Hans Verkuil
2019-08-15 13:50 ` Jacopo Mondi
2019-08-15 14:12 ` Hans Verkuil
2019-08-15 13:23 ` Hans Verkuil
2019-08-15 13:50 ` Jacopo Mondi
2019-08-14 20:28 ` [RFC 4/5] media: i2c: ov5670: Report the camera location Jacopo Mondi
2019-08-14 23:03 ` Laurent Pinchart
2019-08-15 7:04 ` Sakari Ailus
2019-08-14 20:28 ` [RFC 5/5] media: i2c: ov13858: " Jacopo Mondi
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