linux-kernel - Re: [PATCH 08/31] media: v4l-core add v4l_enable/disable_media

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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,
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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);
>