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

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Message-ID: <CA+V-a8uLTmCSzY7xtp_TpAcmt=w5hMEWEpk24py1OD9qxOtYbw@mail.gmail.com>
Date:	Tue, 25 Sep 2012 18:56:11 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Hans Verkuil <hansverk@...co.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	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

Hi Hans/Laurent

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 ?

Regards,
--Prabhakar Lad

> Regards,
>
>         Hans
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