[v11,29/36] media: subdev: add v4l2_subdev_get_fmt() helper function

  Add v4l2_subdev_get_fmt() helper function which implements
v4l2_subdev_pad_ops.get_fmt using streams. Subdev drivers that do not
need to do anything special in their get_fmt op can use this helper
directly for v4l2_subdev_pad_ops.get_fmt.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 16 ++++++++++++++++
 include/media/v4l2-subdev.h           | 17 +++++++++++++++++
 2 files changed, 33 insertions(+)
  

Hi Tomi

On Tue, Mar 01, 2022 at 06:11:49PM +0200, Tomi Valkeinen wrote:
> Add v4l2_subdev_get_fmt() helper function which implements
> v4l2_subdev_pad_ops.get_fmt using streams. Subdev drivers that do not
> need to do anything special in their get_fmt op can use this helper
> directly for v4l2_subdev_pad_ops.get_fmt.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

Thanks
  j

> ---
>  drivers/media/v4l2-core/v4l2-subdev.c | 16 ++++++++++++++++
>  include/media/v4l2-subdev.h           | 17 +++++++++++++++++
>  2 files changed, 33 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index e65f802fe2aa..c1cc9b91dba7 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -1507,6 +1507,22 @@ v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
>  }
>  EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);
>
> +int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
> +			struct v4l2_subdev_format *format)
> +{
> +	struct v4l2_mbus_framefmt *fmt;
> +
> +	fmt = v4l2_subdev_state_get_stream_format(state, format->pad,
> +						  format->stream);
> +	if (!fmt)
> +		return -EINVAL;
> +
> +	format->format = *fmt;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_subdev_get_fmt);
> +
>  #endif /* CONFIG_MEDIA_CONTROLLER */
>
>  void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops *ops)
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index ed3fe21637e6..a80830801a7f 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -1481,6 +1481,23 @@ struct v4l2_mbus_framefmt *
>  v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,
>  					     u32 pad, u32 stream);
>
> +/**
> + * v4l2_subdev_get_fmt() - Fill format based on state
> + * @sd: subdevice
> + * @state: subdevice state
> + * @format: pointer to &struct v4l2_subdev_format
> + *
> + * Fill @format based on the pad and stream given in the @format struct.
> + *
> + * This function can be used by the subdev drivers to implement
> + * v4l2_subdev_pad_ops.get_fmt if the subdev driver does not need to do
> + * anything special in their get_fmt op.
> + *
> + * Returns 0 on success, error value otherwise.
> + */
> +int v4l2_subdev_get_fmt(struct v4l2_subdev *sd, struct v4l2_subdev_state *state,
> +			struct v4l2_subdev_format *format);
> +
>  #endif /* CONFIG_MEDIA_CONTROLLER */
>
>  /**
> --
> 2.25.1
>