linux-kernel - Re: [PATCH] media: davinci: vpif: set device capabilities

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Date:	Tue, 25 Sep 2012 19:26:28 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Hans Verkuil <hansverk@...co.com>,
	LMML <linux-media@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Manjunath Hadli <manjunath.hadli@...com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	VGER <linux-kernel@...r.kernel.org>,
	"Lad, Prabhakar" <prabhakar.lad@...com>,
	Hans Verkuil <hans.verkuil@...co.com>
Subject: Re: [PATCH] media: davinci: vpif: set device capabilities

On Tue, Sep 25, 2012 at 7:20 PM, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
> On Tuesday 25 September 2012 15:48:10 Hans Verkuil wrote:
>> On Tue 25 September 2012 15:26:11 Prabhakar Lad wrote:
>> > On Tue, Sep 25, 2012 at 5:24 PM, Hans Verkuil <hansverk@...co.com> wrote:
>> > > On Tue 25 September 2012 13:49:16 Laurent Pinchart wrote:
>> > >> Hi Hans,
>> > >>
>> > >> On Tuesday 25 September 2012 13:43:36 Hans Verkuil wrote:
>> > >> > On Tue 25 September 2012 13:16:24 Prabhakar wrote:
>> > >> > > From: Lad, Prabhakar <prabhakar.lad@...com>
>> > >> > >
>> > >> > > Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
>> > >> > > Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
>> > >> > > Cc: Hans Verkuil <hans.verkuil@...co.com>
>> > >> > > ---
>> > >> > >
>> > >> > >  drivers/media/platform/davinci/vpif_capture.c |    4 +++-
>> > >> > >  drivers/media/platform/davinci/vpif_display.c |    4 +++-
>> > >> > >  2 files changed, 6 insertions(+), 2 deletions(-)
>> > >> > >
>> > >> > > diff --git a/drivers/media/platform/davinci/vpif_capture.c
>> > >> > > b/drivers/media/platform/davinci/vpif_capture.c index
>> > >> > > 4828888..faeca98
>> > >> > > 100644
>> > >> > > --- a/drivers/media/platform/davinci/vpif_capture.c
>> > >> > > +++ b/drivers/media/platform/davinci/vpif_capture.c
>> > >> > > @@ -1630,7 +1630,9 @@ static int vpif_querycap(struct file *file,
>> > >> > > void
>> > >> > > *priv,>
>> > >> > >
>> > >> > >  {
>> > >> > >
>> > >> > >   struct vpif_capture_config *config = vpif_dev->platform_data;
>> > >> > >
>> > >> > > - cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
>> > >> > > + cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
>> > >> > > +                 V4L2_CAP_READWRITE;
>> > >> > > + cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
>> > >> > >
>> > >> > >   strlcpy(cap->driver, "vpif capture", sizeof(cap->driver));
>> > >> >
>> > >> > This should be the real driver name which is 'vpif_capture'.
>> > >> >
>> > >> > >   strlcpy(cap->bus_info, "VPIF Platform", sizeof(cap->bus_info));
>> > >> >
>> > >> > For bus_info I would use: "platform:vpif_capture".
>> > >> >
>> > >> > The 'platform:' prefix is going to be the standard for platform
>> > >> > drivers.
>> > >>
>> > >> What about
>> > >>
>> > >> snprintf(cap->driver, sizeof(cap->driver), "platform:%s",
>> > >> dev_name(vpif_dev));
>> > >>
>> > >> That would handle cases where multiple platform devices of the same
>> > >> type are present.
>> > >
>> > > Sure, that's even better. You do have to check that this gives you what
>> > > you'd expect (i.e., that you don't end up with
>> > > "platform:platform:vpif_capture").>
>> > But the driver field is max 16, should i extend it to 32 ?
>>
>> I'm certain Laurent meant to say:
>>
>> snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
>> dev_name(vpif_dev));
>
> Yes that's what I meant, sorry.
>
Ok thanks for clarifying.

Regards,
--Prabhakar Lad

>> It makes no sense to use cap->driver.
>
> --
> Regards,
>
> Laurent Pinchart
>
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