linux-kernel - Re: [PATCH v3 3/5] media: vivid: Add an area control

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Date:   Mon, 4 Nov 2019 10:43:55 +0100
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Ricardo Ribalda Delgado <ribalda@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/5] media: vivid: Add an area control

On 11/1/19 12:23 PM, Ricardo Ribalda Delgado wrote:
> This control represents a generic read/write area.
> 
> Suggested-by: Hans Verkuil <hverkuil-cisco@...all.nl>
> Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> ---
>  drivers/media/platform/vivid/vivid-ctrls.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/media/platform/vivid/vivid-ctrls.c b/drivers/media/platform/vivid/vivid-ctrls.c
> index b250fc3764e2..fd35863798a7 100644
> --- a/drivers/media/platform/vivid/vivid-ctrls.c
> +++ b/drivers/media/platform/vivid/vivid-ctrls.c
> @@ -32,6 +32,7 @@
>  #define VIVID_CID_U32_ARRAY		(VIVID_CID_CUSTOM_BASE + 8)
>  #define VIVID_CID_U16_MATRIX		(VIVID_CID_CUSTOM_BASE + 9)
>  #define VIVID_CID_U8_4D_ARRAY		(VIVID_CID_CUSTOM_BASE + 10)
> +#define VIVID_CID_AREA			(VIVID_CID_CUSTOM_BASE + 11)
>  
>  #define VIVID_CID_VIVID_BASE		(0x00f00000 | 0xf000)
>  #define VIVID_CID_VIVID_CLASS		(0x00f00000 | 1)
> @@ -266,6 +267,18 @@ static const struct v4l2_ctrl_config vivid_ctrl_disconnect = {
>  	.type = V4L2_CTRL_TYPE_BUTTON,
>  };
>  
> +static const struct v4l2_area area = {
> +	.width = 0xcafe,
> +	.height = 0xb1b1d,

I don't think there is any need for these weird values. Just set this to
e.g. 1000x2000. Just as long as width and height are different.

Regards,

	Hans

> +};
> +
> +static const struct v4l2_ctrl_config vivid_ctrl_area = {
> +	.ops = &vivid_user_gen_ctrl_ops,
> +	.id = VIVID_CID_AREA,
> +	.name = "Area",
> +	.type = V4L2_CTRL_TYPE_AREA,
> +	.p_def.p_const = &area,
> +};
>  
>  /* Framebuffer Controls */
>  
> @@ -1574,6 +1587,7 @@ int vivid_create_controls(struct vivid_dev *dev, bool show_ccs_cap,
>  	dev->string = v4l2_ctrl_new_custom(hdl_user_gen, &vivid_ctrl_string, NULL);
>  	dev->bitmask = v4l2_ctrl_new_custom(hdl_user_gen, &vivid_ctrl_bitmask, NULL);
>  	dev->int_menu = v4l2_ctrl_new_custom(hdl_user_gen, &vivid_ctrl_int_menu, NULL);
> +	v4l2_ctrl_new_custom(hdl_user_gen, &vivid_ctrl_area, NULL);
>  	v4l2_ctrl_new_custom(hdl_user_gen, &vivid_ctrl_u32_array, NULL);
>  	v4l2_ctrl_new_custom(hdl_user_gen, &vivid_ctrl_u16_matrix, NULL);
>  	v4l2_ctrl_new_custom(hdl_user_gen, &vivid_ctrl_u8_4d_array, NULL);
>