Re: [RFC PATCH v5 6/9] media: tegra: Add Tegra210 Video input driver

From: Sakari Ailus <sakari.ailus@iki.fi>
To: Sowjanya Komatineni <skomatineni@nvidia.com>
Cc: thierry.reding@gmail.com, jonathanh@nvidia.com,
	frankc@nvidia.com, hverkuil@xs4all.nl, helen.koike@collabora.com,
	digetx@gmail.com, sboyd@kernel.org, linux-media@vger.kernel.org,
	devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
	linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH v5 6/9] media: tegra: Add Tegra210 Video input driver
Date: Thu, 26 Mar 2020 16:48:20 +0200	[thread overview]
Message-ID: <20200326144820.GB2394@valkosipuli.retiisi.org.uk> (raw)
In-Reply-To: <a219aeb2-3d00-016e-eed9-503a9fbd0d13@nvidia.com>

Hi Sowjanya,

On Wed, Mar 25, 2020 at 11:30:18PM -0700, Sowjanya Komatineni wrote:
> 
> On 3/25/20 4:03 AM, Sakari Ailus wrote:
> > > +static int tegra_channel_enum_input(struct file *file, void *fh,
> > > +                                 struct v4l2_input *inp)
> > > +{
> > > +     /* currently driver supports internal TPG only */
> > > +     if (inp->index)
> > > +             return -EINVAL;
> > > +
> > > +     inp->type = V4L2_INPUT_TYPE_CAMERA;
> > > +     strscpy(inp->name, "Tegra TPG", sizeof(inp->name));
> > > +
> > > +     return 0;
> > > +}
> > > +
> > > +static int tegra_channel_g_input(struct file *file, void *priv,
> > > +                              unsigned int *i)
> > > +{
> > > +     *i = 0;
> > > +     return 0;
> > > +}
> > > +
> > > +static int tegra_channel_s_input(struct file *file, void *priv,
> > > +                              unsigned int input)
> > > +{
> > > +     if (input > 0)
> > > +             return -EINVAL;
> > > +
> > > +     return 0;
> > > +}
> > Please see patchset on topic "v4l2-dev/ioctl: Add V4L2_CAP_IO_MC" on
> > linux-media; it's relevant here, too.
> 
> Can update in v6 to add device caps V4L2_CAP_IO_MC and remove enum/g/s_input
> ioctls.
> 
> But, I don't see this patch "v4l2-dev/ioctl: Add V4L2_CAP_IO_MC" on latest
> linux-next

It's not merged yet but likely will be very soon.

-- 
Sakari Ailus