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SubjectRe: [PATCH v5 17/39] [media] v4l2-mc: add a function to inherit controls from a pipeline
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On 10/03/17 05:52, Steve Longerbeam wrote:
> v4l2_pipeline_inherit_controls() will add the v4l2 controls from
> all subdev entities in a pipeline to a given video device.
>
> Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
> ---
> drivers/media/v4l2-core/v4l2-mc.c | 48 +++++++++++++++++++++++++++++++++++++++
> include/media/v4l2-mc.h | 25 ++++++++++++++++++++
> 2 files changed, 73 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-mc.c b/drivers/media/v4l2-core/v4l2-mc.c
> index 303980b..09d4d97 100644
> --- a/drivers/media/v4l2-core/v4l2-mc.c
> +++ b/drivers/media/v4l2-core/v4l2-mc.c
> @@ -22,6 +22,7 @@
> #include <linux/usb.h>
> #include <media/media-device.h>
> #include <media/media-entity.h>
> +#include <media/v4l2-ctrls.h>
> #include <media/v4l2-fh.h>
> #include <media/v4l2-mc.h>
> #include <media/v4l2-subdev.h>
> @@ -238,6 +239,53 @@ int v4l_vb2q_enable_media_source(struct vb2_queue *q)
> }
> EXPORT_SYMBOL_GPL(v4l_vb2q_enable_media_source);
>
> +int __v4l2_pipeline_inherit_controls(struct video_device *vfd,
> + struct media_entity *start_entity)
> +{
> + struct media_device *mdev = start_entity->graph_obj.mdev;
> + struct media_entity *entity;
> + struct media_graph graph;
> + struct v4l2_subdev *sd;
> + int ret;
> +
> + ret = media_graph_walk_init(&graph, mdev);
> + if (ret)
> + return ret;
> +
> + media_graph_walk_start(&graph, start_entity);
> +
> + while ((entity = media_graph_walk_next(&graph))) {
> + if (!is_media_entity_v4l2_subdev(entity))
> + continue;
> +
> + sd = media_entity_to_v4l2_subdev(entity);
> +
> + ret = v4l2_ctrl_add_handler(vfd->ctrl_handler,
> + sd->ctrl_handler,
> + NULL);
> + if (ret)
> + break;
> + }
> +
> + media_graph_walk_cleanup(&graph);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(__v4l2_pipeline_inherit_controls);
> +
> +int v4l2_pipeline_inherit_controls(struct video_device *vfd,
> + struct media_entity *start_entity)
> +{
> + struct media_device *mdev = start_entity->graph_obj.mdev;
> + int ret;
> +
> + mutex_lock(&mdev->graph_mutex);
> + ret = __v4l2_pipeline_inherit_controls(vfd, start_entity);
> + mutex_unlock(&mdev->graph_mutex);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_pipeline_inherit_controls);
> +
> /* -----------------------------------------------------------------------------
> * Pipeline power management
> *
> diff --git a/include/media/v4l2-mc.h b/include/media/v4l2-mc.h
> index 2634d9d..9848e77 100644
> --- a/include/media/v4l2-mc.h
> +++ b/include/media/v4l2-mc.h
> @@ -171,6 +171,17 @@ void v4l_disable_media_source(struct video_device *vdev);
> */
> int v4l_vb2q_enable_media_source(struct vb2_queue *q);
>
> +/**
> + * v4l2_pipeline_inherit_controls - Add the v4l2 controls from all
> + * subdev entities in a pipeline to
> + * the given video device.
> + * @vfd: the video device
> + * @start_entity: Starting entity
> + */
> +int __v4l2_pipeline_inherit_controls(struct video_device *vfd,
> + struct media_entity *start_entity);
> +int v4l2_pipeline_inherit_controls(struct video_device *vfd,
> + struct media_entity *start_entity);

Please document which is the unlocked variant and which lock the locked
variant takes.

Regards,

Hans

>
> /**
> * v4l2_pipeline_pm_use - Update the use count of an entity
> @@ -231,6 +242,20 @@ static inline int v4l_vb2q_enable_media_source(struct vb2_queue *q)
> return 0;
> }
>
> +static inline int __v4l2_pipeline_inherit_controls(
> + struct video_device *vfd,
> + struct media_entity *start_entity)
> +{
> + return 0;
> +}
> +
> +static inline int v4l2_pipeline_inherit_controls(
> + struct video_device *vfd,
> + struct media_entity *start_entity)
> +{
> + return 0;
> +}
> +
> static inline int v4l2_pipeline_pm_use(struct media_entity *entity, int use)
> {
> return 0;
>

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