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SubjectRe: [PATCH v2 2/4] media: v4l2-mc add v4l_change_media_source() to invoke change_source
Em Thu, 10 Mar 2016 11:17:48 -0700
Shuah Khan <shuahkh@osg.samsung.com> escreveu:

> Add a common routine to invoke media device change_source handler.
>
> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

Shuah,

I'm marking this series of patches as superseded at patchwork, as I
intend that you'll be submitting it somewhere in the future,
together with a new version of the snd-usb-audio MC support (when ready
for upstream merge), and if this is still needed.

Regards,
Mauro

> ---
>
> Changes since v1:
> - Fixed !CONFIG_MEDIA_CONTROLLER compile error for v4l_change_media_source()
>
> drivers/media/v4l2-core/v4l2-mc.c | 14 ++++++++++++++
> include/media/v4l2-mc.h | 25 ++++++++++++++++++++++++-
> 2 files changed, 38 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-mc.c b/drivers/media/v4l2-core/v4l2-mc.c
> index ae661ac..478b2768 100644
> --- a/drivers/media/v4l2-core/v4l2-mc.c
> +++ b/drivers/media/v4l2-core/v4l2-mc.c
> @@ -217,6 +217,20 @@ void v4l_disable_media_source(struct video_device *vdev)
> }
> EXPORT_SYMBOL_GPL(v4l_disable_media_source);
>
> +int v4l_change_media_source(struct video_device *vdev)
> +{
> + struct media_device *mdev = vdev->entity.graph_obj.mdev;
> + int ret;
> +
> + if (!mdev || !mdev->change_source)
> + return 0;
> + ret = mdev->change_source(&vdev->entity, &vdev->pipe);
> + if (ret)
> + return -EBUSY;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l_change_media_source);
> +
> int v4l_vb2q_enable_media_source(struct vb2_queue *q)
> {
> struct v4l2_fh *fh = q->owner;
> diff --git a/include/media/v4l2-mc.h b/include/media/v4l2-mc.h
> index 98a938a..50b9348 100644
> --- a/include/media/v4l2-mc.h
> +++ b/include/media/v4l2-mc.h
> @@ -154,8 +154,26 @@ int v4l_enable_media_source(struct video_device *vdev);
> */
> void v4l_disable_media_source(struct video_device *vdev);
>
> +/**
> + * v4l_change_media_source() - Hold media source for exclusive use
> + * if free
> + *
> + * @vdev: pointer to struct video_device
> + *
> + * This interface calls change_source handler to change
> + * the current source it is holding. The change_source
> + * disables the current source and starts pipeline to
> + * the new source. This interface should be used when
> + * user changes source using s_input handler to keep
> + * the previously granted permission for exclusive use
> + * with a new input source.
> + *
> + * Return: returns zero on success or a negative error code.
> + */
> +int v4l_change_media_source(struct video_device *vdev);
> +
> /*
> - * v4l_vb2q_enable_media_tuner - Hold media source for exclusive use
> + * v4l_vb2q_enable_media_source - Hold media source for exclusive use
> * if free.
> * @q - pointer to struct vb2_queue
> *
> @@ -219,6 +237,11 @@ static inline int v4l_enable_media_source(struct video_device *vdev)
> return 0;
> }
>
> +static inline int v4l_change_media_source(struct video_device *vdev)
> +{
> + return 0;
> +}
> +
> static inline void v4l_disable_media_source(struct video_device *vdev)
> {
> }


--
Thanks,
Mauro

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