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Message-ID: <4c2a519a-0e88-c4c8-9a71-e9d0cd370375@xs4all.nl>
Date: Thu, 29 Aug 2019 12:39:26 +0200
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Ricardo Ribalda Delgado <ribalda@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
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 1/7] media: add V4L2_CID_UNIT_CELL_SIZE control
On 8/23/19 2:37 PM, Ricardo Ribalda Delgado wrote:
> This control returns the unit cell size in nanometres. The struct provides
> the width and the height in separated fields to take into consideration
> asymmetric pixels and/or hardware binning.
> This control is required for automatic calibration of sensors/cameras.
>
> Signed-off-by: Ricardo Ribalda Delgado <ribalda@...nel.org>
> ---
> v3:
> -Put together all actions on ctrl_fill
> -Move the control to IMAGE_SOURCE
>
> drivers/media/v4l2-core/v4l2-ctrls.c | 11 +++++++++++
> include/media/v4l2-ctrls.h | 2 ++
> include/uapi/linux/v4l2-controls.h | 1 +
> include/uapi/linux/videodev2.h | 11 +++++++++++
> 4 files changed, 25 insertions(+)
>
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 1d8f38824631..b3bf458df7f7 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -994,6 +994,7 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_AUTO_FOCUS_RANGE: return "Auto Focus, Range";
> case V4L2_CID_PAN_SPEED: return "Pan, Speed";
> case V4L2_CID_TILT_SPEED: return "Tilt, Speed";
> + case V4L2_CID_UNIT_CELL_SIZE: return "Unit Cell Size";
>
> /* FM Radio Modulator controls */
> /* Keep the order of the 'case's the same as in v4l2-controls.h! */
> @@ -1375,6 +1376,10 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER:
> *type = V4L2_CTRL_TYPE_VP8_FRAME_HEADER;
> break;
> + case V4L2_CID_UNIT_CELL_SIZE:
> + *type = V4L2_CTRL_TYPE_AREA;
> + *flags |= V4L2_CTRL_FLAG_READ_ONLY;
> + break;
> default:
> *type = V4L2_CTRL_TYPE_INTEGER;
> break;
> @@ -1723,6 +1728,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> case V4L2_CTRL_TYPE_FWHT_PARAMS:
> break;
>
> + case V4L2_CTRL_TYPE_AREA:
You need to check that the width and height are not 0 (that would make no sense).
> + break;
> +
> case V4L2_CTRL_TYPE_H264_SPS:
> case V4L2_CTRL_TYPE_H264_PPS:
> case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
> @@ -2421,6 +2429,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
> elem_size = sizeof(struct v4l2_ctrl_vp8_frame_header);
> break;
> + case V4L2_CTRL_TYPE_AREA:
> + elem_size = sizeof(struct v4l2_area);
> + break;
> default:
> if (type < V4L2_CTRL_COMPOUND_TYPES)
> elem_size = sizeof(s32);
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 570ff4b0205a..9a3d11350e67 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -50,6 +50,7 @@ struct poll_table_struct;
> * @p_h264_slice_params: Pointer to a struct v4l2_ctrl_h264_slice_params.
> * @p_h264_decode_params: Pointer to a struct v4l2_ctrl_h264_decode_params.
> * @p_vp8_frame_header: Pointer to a VP8 frame header structure.
> + * @p_area: Pointer to an area.
> * @p: Pointer to a compound value.
> */
> union v4l2_ctrl_ptr {
> @@ -68,6 +69,7 @@ union v4l2_ctrl_ptr {
> struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
> struct v4l2_ctrl_h264_decode_params *p_h264_decode_params;
> struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
> + struct v4l2_area *p_area;
> void *p;
> };
>
> diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
> index a2669b79b294..5a7bedee2b0e 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -1034,6 +1034,7 @@ enum v4l2_jpeg_chroma_subsampling {
> #define V4L2_CID_TEST_PATTERN_GREENR (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 5)
> #define V4L2_CID_TEST_PATTERN_BLUE (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 6)
> #define V4L2_CID_TEST_PATTERN_GREENB (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 7)
> +#define V4L2_CID_UNIT_CELL_SIZE (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 8)
>
>
> /* Image processing controls */
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 530638dffd93..05cfc69d7ed6 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -422,6 +422,11 @@ struct v4l2_fract {
> __u32 denominator;
> };
>
> +struct v4l2_area {
> + __u32 width;
> + __u32 height;
> +};
> +
> /**
> * struct v4l2_capability - Describes V4L2 device caps returned by VIDIOC_QUERYCAP
> *
> @@ -1720,6 +1725,12 @@ enum v4l2_ctrl_type {
> V4L2_CTRL_TYPE_U8 = 0x0100,
> V4L2_CTRL_TYPE_U16 = 0x0101,
> V4L2_CTRL_TYPE_U32 = 0x0102,
> + /*
> + * V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS = 0x0103,
> + * V4L2_CTRL_TYPE_MPEG2_QUANTIZATION = 0x0104,
> + * V4L2_CTRL_TYPE_FWHT_PARAMS = 0x0105,
> + */
I'd drop this comment. Not because it is wrong as such, but it is
incomplete (there are more of these types today) and I think these
types (most of them in staging) need a bit of a cleanup. Something
I want to look at for the next kernel cycle.
> + V4L2_CTRL_TYPE_AREA = 0x0106,
> };
>
> /* Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
>
Regards,
Hans
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