linux-kernel - Re: [PATCH v6 7/7] media: imx214: Add new control with V4L2_CID_UNIT_CELL

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Date:   Fri, 27 Sep 2019 09:14:13 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Ricardo Ribalda Delgado <ricardo@...alda.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Jacopo Mondi <jacopo@...ndi.org>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda Delgado <ribalda@...nel.org>
Subject: Re: [PATCH v6 7/7] media: imx214: Add new control with
 V4L2_CID_UNIT_CELL_SIZE

On 9/20/19 3:51 PM, Ricardo Ribalda Delgado wrote:
> From: Ricardo Ribalda Delgado <ribalda@...nel.org>
> 
> According to the product brief, the unit cell size is 1120 nanometers^2.
> 
> https://www.sony-semicon.co.jp/products_en/IS/sensor1/img/products/ProductBrief_IMX214_20150428.pdf
> 
> Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> ---
>  drivers/media/i2c/imx214.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
> index 159a3a604f0e..57562e20c4ca 100644
> --- a/drivers/media/i2c/imx214.c
> +++ b/drivers/media/i2c/imx214.c
> @@ -47,6 +47,7 @@ struct imx214 {
>  	struct v4l2_ctrl *pixel_rate;
>  	struct v4l2_ctrl *link_freq;
>  	struct v4l2_ctrl *exposure;
> +	struct v4l2_ctrl *unit_size;
>  
>  	struct regulator_bulk_data	supplies[IMX214_NUM_SUPPLIES];
>  
> @@ -948,6 +949,13 @@ static int imx214_probe(struct i2c_client *client)
>  	static const s64 link_freq[] = {
>  		IMX214_DEFAULT_LINK_FREQ,
>  	};
> +	struct v4l2_area unit_size = {
> +		.width = 1120,
> +		.height = 1120,
> +	};
> +	union v4l2_ctrl_ptr p_def = {
> +		.p_area = &unit_size,
> +	};

Use static const for both.

I think you should add a small static inline helper function to v4l2-ctrls.h that
takes a void pointer and returns a union v4l2_ctrl_ptr.

Then you don't need to make a union v4l2_ctrl_ptr just to pass the unit_size pointer.

Regards,

	Hans

>  	int ret;
>  
>  	ret = imx214_parse_fwnode(dev);
> @@ -1029,6 +1037,10 @@ static int imx214_probe(struct i2c_client *client)
>  					     V4L2_CID_EXPOSURE,
>  					     0, 3184, 1, 0x0c70);
>  
> +	imx214->unit_size = v4l2_ctrl_new_std_compound(&imx214->ctrls,
> +						       NULL,
> +						       V4L2_CID_UNIT_CELL_SIZE,
> +						       p_def);
>  	ret = imx214->ctrls.error;
>  	if (ret) {
>  		dev_err(&client->dev, "%s control init failed (%d)\n",
>