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Message-ID: <20160128132651.748a1271@recife.lan>
Date:	Thu, 28 Jan 2016 13:26:51 -0200
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	tiwai@...e.com, clemens@...isch.de, hans.verkuil@...co.com,
	laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
	javier@....samsung.com, pawel@...iak.com, m.szyprowski@...sung.com,
	kyungmin.park@...sung.com, perex@...ex.cz, arnd@...db.de,
	dan.carpenter@...cle.com, tvboxspy@...il.com, crope@....fi,
	ruchandani.tina@...il.com, corbet@....net, chehabrafael@...il.com,
	k.kozlowski@...sung.com, stefanr@...6.in-berlin.de,
	inki.dae@...sung.com, jh1009.sung@...sung.com,
	elfring@...rs.sourceforge.net, prabhakar.csengg@...il.com,
	sw0312.kim@...sung.com, p.zabel@...gutronix.de,
	ricardo.ribalda@...il.com, labbott@...oraproject.org,
	pierre-louis.bossart@...ux.intel.com, ricard.wanderlof@...s.com,
	julian@...st.de, takamichiho@...il.com, dominic.sacre@....de,
	misterpib@...il.com, daniel@...que.org, gtmkramer@...all.nl,
	normalperson@...t.net, joe@...po.co.uk, linuxbugs@...tgam.net,
	johan@...ud.se, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org, linux-api@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [PATCH 08/31] media: v4l-core add
 v4l_enable/disable_media_tuner() helper functions

Em Wed,  6 Jan 2016 13:26:57 -0700
Shuah Khan <shuahkh@....samsung.com> escreveu:

> Add a new interfaces to be used by v4l-core to invoke enable
> source and disable_source handlers in the media_device. The
> enable_source helper function invokes the enable_source handler
> to find tuner entity connected to the decoder and check is it
> is available or busy. If tuner is available, link is activated
> and pipeline is started. The disable_source helper function
> invokes the disable_source handler to deactivate and stop the
> pipeline.
> 
> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> ---
>  drivers/media/v4l2-core/v4l2-dev.c | 27 +++++++++++++++++++++++++++
>  include/media/v4l2-dev.h           |  4 ++++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
> index d8e5994..f06da6e 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -233,6 +233,33 @@ struct video_device *video_devdata(struct file *file)
>  }
>  EXPORT_SYMBOL(video_devdata);
>  
> +int v4l_enable_media_tuner(struct video_device *vdev)

IMHO, the better is to put those MC ancillary routines on a separate file.
Hans suggested to add them at v4l2-mc.h and v4l2-mc.h.

> +{
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +	struct media_device *mdev = vdev->entity.graph_obj.mdev;
> +	int ret;
> +
> +	if (!mdev || !mdev->enable_source)
> +		return 0;
> +	ret = mdev->enable_source(&vdev->entity, &vdev->pipe);
> +	if (ret)
> +		return -EBUSY;
> +	return 0;
> +#endif /* CONFIG_MEDIA_CONTROLLER */
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l_enable_media_tuner);
> +
> +void v4l_disable_media_tuner(struct video_device *vdev)
> +{
> +#ifdef CONFIG_MEDIA_CONTROLLER
> +	struct media_device *mdev = vdev->entity.graph_obj.mdev;
> +
> +	if (mdev && mdev->disable_source)
> +		mdev->disable_source(&vdev->entity);
> +#endif /* CONFIG_MEDIA_CONTROLLER */
> +}
> +EXPORT_SYMBOL_GPL(v4l_disable_media_tuner);
>  
>  /* Priority handling */
>  
> diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
> index eeabf20..68999a3 100644
> --- a/include/media/v4l2-dev.h
> +++ b/include/media/v4l2-dev.h
> @@ -87,6 +87,7 @@ struct video_device
>  #if defined(CONFIG_MEDIA_CONTROLLER)
>  	struct media_entity entity;
>  	struct media_intf_devnode *intf_devnode;
> +	struct media_pipeline pipe;
>  #endif
>  	/* device ops */
>  	const struct v4l2_file_operations *fops;
> @@ -176,6 +177,9 @@ void video_unregister_device(struct video_device *vdev);
>     latter can also be used for video_device->release(). */
>  struct video_device * __must_check video_device_alloc(void);
>  
> +int v4l_enable_media_tuner(struct video_device *vdev);
> +void v4l_disable_media_tuner(struct video_device *vdev);

Documentation?

> +
>  /* this release function frees the vdev pointer */
>  void video_device_release(struct video_device *vdev);
>  

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