linux-kernel - Re: [PATCH 09/31] media: v4l2-core add v4l_vb2q_enable_media

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Message-ID: <20160128132937.3305eff3@recife.lan>
Date:	Thu, 28 Jan 2016 13:29:37 -0200
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Shuah Khan <shuahkh@....samsung.com>
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Subject: Re: [PATCH 09/31] media: v4l2-core add
 v4l_vb2q_enable_media_tuner() helper

Em Wed,  6 Jan 2016 13:26:58 -0700
Shuah Khan <shuahkh@....samsung.com> escreveu:

> Add a new v4l_vb2q_enable_media_tuner() wrapper function
> to be called from v4l2-core to enable the media tuner with
> videobuf2 queue, when the calling frunction has the videobuf2
> queue and doesn't have the struct video_device associated with
> the queue handy as in the case of vb2_core_streamon(). This
> function simply calls v4l_enable_media_tuner() passing in the
> pointer to struct video_device.
> 
> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> ---
>  drivers/media/v4l2-core/v4l2-dev.c | 21 +++++++++++++++++++++
>  include/media/v4l2-dev.h           |  1 +
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
> index f06da6e..9ef675a 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -30,6 +30,7 @@
>  #include <media/v4l2-common.h>
>  #include <media/v4l2-device.h>
>  #include <media/v4l2-ioctl.h>
> +#include <media/videobuf2-core.h>
>  
>  #define VIDEO_NUM_DEVICES	256
>  #define VIDEO_NAME              "video4linux"
> @@ -261,6 +262,26 @@ void v4l_disable_media_tuner(struct video_device *vdev)
>  }
>  EXPORT_SYMBOL_GPL(v4l_disable_media_tuner);
>  
> +/**
> + * v4l_vb2q_enable_media_tuner - Wrapper for v4l_enable_media_tuner()
> + * @q:         videobuf2 queue
> + *
> + * This function is intended to be called from v4l2-core
> + * to enable the media tuner with videobuf2 queue, when
> + * the calling frunction has the videobuf2 queue and doesn't

	typo: function

> + * have the struct video_device associated with the
> + * queue handy as in the case of vb2_core_streamon(). This
> + * function simply calls v4l_enable_media_tuner() passing
> + * in the pointer to struct video_device.

The hole description seems confusing. I'm not seeing the light
about why this is needed.

> + */
> +int v4l_vb2q_enable_media_tuner(struct vb2_queue *q)
> +{
> +	struct v4l2_fh *fh = q->owner;
> +
> +	return v4l_enable_media_tuner(fh->vdev);
> +}
> +EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_tuner);
> +
>  /* Priority handling */
>  
>  static inline bool prio_is_valid(enum v4l2_priority prio)
> diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
> index 68999a3..1948097 100644
> --- a/include/media/v4l2-dev.h
> +++ b/include/media/v4l2-dev.h
> @@ -179,6 +179,7 @@ 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);
> +int v4l_vb2q_enable_media_tuner(struct vb2_queue *q);

Documentation?

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