linux-kernel - Re: [PATCH v3 5/7] media: v4l2-core: Add new helper for area controls

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Date:   Fri, 23 Aug 2019 14:56:38 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Ricardo Ribalda Delgado <ribalda@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: Re: [PATCH v3 5/7] media: v4l2-core: Add new helper for area
 controls

On Fri, 2019-08-23 at 14:37 +0200, Ricardo Ribalda Delgado wrote:
> Adding a V4L2_CID_UNIT_CELL_SIZE control requires a lot of boilerplate,
> try to minimize it by adding a new helper.
> 
> Suggested-by: Philipp Zabel <p.zabel@...gutronix.de>
> Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> ---
>  drivers/media/v4l2-core/v4l2-ctrls.c | 25 ++++++++++++++++++++++++-
>  include/media/v4l2-ctrls.h           | 16 ++++++++++++++++
>  2 files changed, 40 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index b3bf458df7f7..33e48f0aec1a 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -2660,7 +2660,6 @@ struct v4l2_ctrl *v4l2_ctrl_new_std_menu_items(struct v4l2_ctrl_handler *hdl,
>  }
>  EXPORT_SYMBOL(v4l2_ctrl_new_std_menu_items);
>  
> -/* Helper function for standard integer menu controls */

Why move this ...

>  struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
>  			const struct v4l2_ctrl_ops *ops,
>  			u32 id, u8 _max, u8 _def, const s64 *qmenu_int)
> @@ -2684,6 +2683,30 @@ struct v4l2_ctrl *v4l2_ctrl_new_int_menu(struct v4l2_ctrl_handler *hdl,
>  }
>  EXPORT_SYMBOL(v4l2_ctrl_new_int_menu);
>  
> +static void area_init(const struct v4l2_ctrl *ctrl, u32 idx,
> +		union v4l2_ctrl_ptr ptr)
> +{
> +	memcpy(ptr.p_area, ctrl->priv, sizeof(*ptr.p_area));
> +}
> +
> +static const struct v4l2_ctrl_type_ops area_ops = {
> +	.init = area_init,
> +};
> +
> +struct v4l2_ctrl *v4l2_ctrl_new_area(struct v4l2_ctrl_handler *hdl,
> +				     const struct v4l2_ctrl_ops *ops,
> +				     u32 id, const struct v4l2_area *area)
> +{
> +	static struct v4l2_ctrl_config ctrl = {
> +		.id = V4L2_CID_UNIT_CELL_SIZE,
> +		.type_ops = &area_ops,
> +	};
> +
> +	return v4l2_ctrl_new_custom(hdl, &ctrl, (void *)area);
> +}
> +EXPORT_SYMBOL(v4l2_ctrl_new_area);
> +
> +/* Helper function for standard integer menu controls */

... here?

Looks to me like this comment should stay attached to
v4l2_ctrl_new_int_menu.

regards
Philipp