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

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Message-Id: <201209251354.29824.hansverk@cisco.com>
Date:	Tue, 25 Sep 2012 13:54:29 +0200
From:	Hans Verkuil <hansverk@...co.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:	Prabhakar <prabhakar.csengg@...il.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 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").

Regards,

	Hans
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