[PATCH v2 1/3] media: add V4L2_CID_UNIT_CELL_SIZE control

[PATCH v2 1/3] media: add V4L2_CID_UNIT_CELL_SIZE control

[Ricardo Ribalda Delgado]

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@kernel.org>
---
 drivers/media/v4l2-core/v4l2-ctrls.c | 11 +++++++++++
 include/media/v4l2-ctrls.h           |  2 ++
 include/uapi/linux/v4l2-controls.h   |  3 +++
 include/uapi/linux/videodev2.h       | 11 +++++++++++
 4 files changed, 27 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index cd1ae016706f..ec949453a081 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -978,6 +978,7 @@ 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! */
@@ -1357,6 +1358,9 @@ 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;
+		break;
 	default:
 		*type = V4L2_CTRL_TYPE_INTEGER;
 		break;
@@ -1423,6 +1427,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
 	case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
 	case V4L2_CID_RDS_RX_MUSIC_SPEECH:
+	case V4L2_CID_UNIT_CELL_SIZE:
 		*flags |= V4L2_CTRL_FLAG_READ_ONLY;
 		break;
 	case V4L2_CID_RF_TUNER_PLL_LOCK:
@@ -1705,6 +1710,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
 	case V4L2_CTRL_TYPE_FWHT_PARAMS:
 		break;
 
+	case V4L2_CTRL_TYPE_AREA:
+		break;
+
 	case V4L2_CTRL_TYPE_H264_SPS:
 	case V4L2_CTRL_TYPE_H264_PPS:
 	case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
@@ -2403,6 +2411,9 @@ 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..1332eabd27b1 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -912,6 +912,9 @@ enum v4l2_auto_focus_range {
 #define V4L2_CID_PAN_SPEED			(V4L2_CID_CAMERA_CLASS_BASE+32)
 #define V4L2_CID_TILT_SPEED			(V4L2_CID_CAMERA_CLASS_BASE+33)
 
+#define V4L2_CID_UNIT_CELL_SIZE			(V4L2_CID_CAMERA_CLASS_BASE+34)
+
+
 /* FM Modulator class control IDs */
 
 #define V4L2_CID_FM_TX_CLASS_BASE		(V4L2_CTRL_CLASS_FM_TX | 0x900)
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 2427bc4d8eba..751e2065ac02 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
   *
@@ -1718,6 +1723,12 @@ 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,
+	 */
+	V4L2_CTRL_TYPE_AREA    = 0x0106,
 };
 
 /*  Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
-- 
2.23.0.rc1

[PATCH v2 2/3] Documentation: media: Describe V4L2_CID_UNIT_CELL_SIZE

[Ricardo Ribalda Delgado]

New control to pass to userspace the width/height of a pixel. Which is
needed for calibration and lens selection.

Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
---
 Documentation/media/uapi/v4l/ext-ctrls-camera.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
index 51c1d5c9eb00..b43047d4e7a1 100644
--- a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
+++ b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
@@ -510,6 +510,14 @@ enum v4l2_scene_mode -
     value down. A value of zero stops the motion if one is in progress
     and has no effect otherwise.
 
+``V4L2_CID_UNIT_CELL_SIZE (struct)``
+    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.
+    The unit cell consist on the whole area of the pixel, sensitive and
+    non-sensitive.
+    This control is required for automatic calibration sensors/cameras.
+
 .. [#f1]
    This control may be changed to a menu control in the future, if more
    options are required.
-- 
2.23.0.rc1

[PATCH v2 3/3] media: imx214: Add new control with V4L2_CID_UNIT_CELL_SIZE

[Ricardo Ribalda Delgado]

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@kernel.org>
---
 drivers/media/i2c/imx214.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
index 159a3a604f0e..cc0a013ba7da 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];
 
@@ -941,6 +942,26 @@ static int __maybe_unused imx214_resume(struct device *dev)
 	return ret;
 }
 
+static void unit_size_init(const struct v4l2_ctrl *ctrl, u32 idx,
+		     union v4l2_ctrl_ptr ptr)
+{
+	ptr.p_area->width = 1120;
+	ptr.p_area->height = 1120;
+}
+
+static const struct v4l2_ctrl_type_ops unit_size_ops = {
+	.init = unit_size_init,
+};
+
+static struct v4l2_ctrl *new_unit_size_ctrl(struct v4l2_ctrl_handler *handler)
+{
+	static struct v4l2_ctrl_config ctrl = {
+		.id = V4L2_CID_UNIT_CELL_SIZE,
+		.type_ops = &unit_size_ops,
+	};
+
+	return v4l2_ctrl_new_custom(handler, &ctrl, NULL);
+}
 static int imx214_probe(struct i2c_client *client)
 {
 	struct device *dev = &client->dev;
@@ -1029,6 +1050,8 @@ static int imx214_probe(struct i2c_client *client)
 					     V4L2_CID_EXPOSURE,
 					     0, 3184, 1, 0x0c70);
 
+	imx214->unit_size = new_unit_size_ctrl(&imx214->ctrls);
+
 	ret = imx214->ctrls.error;
 	if (ret) {
 		dev_err(&client->dev, "%s control init failed (%d)\n",
-- 
2.23.0.rc1

Re: [PATCH v2 2/3] Documentation: media: Describe V4L2_CID_UNIT_CELL_SIZE

[Philipp Zabel]

On Tue, 2019-08-20 at 11:40 +0200, Ricardo Ribalda Delgado wrote:
> New control to pass to userspace the width/height of a pixel. Which is
> needed for calibration and lens selection.
> 
> Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
> ---
>  Documentation/media/uapi/v4l/ext-ctrls-camera.rst | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> index 51c1d5c9eb00..b43047d4e7a1 100644
> --- a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> +++ b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> @@ -510,6 +510,14 @@ enum v4l2_scene_mode -
>      value down. A value of zero stops the motion if one is in progress
>      and has no effect otherwise.
>  
> +``V4L2_CID_UNIT_CELL_SIZE (struct)``
> +    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.
> +    The unit cell consist on the whole area of the pixel, sensitive and
> +    non-sensitive.

"consists of", otherwise this looks unambiguous to me.

I'm not sure if it is required to add a table for struct v4l2_area,
similarly to the other compound controls.

> +    This control is required for automatic calibration sensors/cameras.
> +
>  .. [#f1]
>     This control may be changed to a menu control in the future, if more
>     options are required.

regards
Philipp

Re: [PATCH v2 2/3] Documentation: media: Describe V4L2_CID_UNIT_CELL_SIZE

[Ricardo Ribalda Delgado]

Hi Philipp

On Tue, Aug 20, 2019 at 5:42 PM Philipp Zabel <p.zabel@pengutronix.de> wrote:
>
> On Tue, 2019-08-20 at 11:40 +0200, Ricardo Ribalda Delgado wrote:
> > New control to pass to userspace the width/height of a pixel. Which is
> > needed for calibration and lens selection.
> >
> > Signed-off-by: Ricardo Ribalda Delgado <ribalda@kernel.org>
> > ---
> >  Documentation/media/uapi/v4l/ext-ctrls-camera.rst | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> > index 51c1d5c9eb00..b43047d4e7a1 100644
> > --- a/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> > +++ b/Documentation/media/uapi/v4l/ext-ctrls-camera.rst
> > @@ -510,6 +510,14 @@ enum v4l2_scene_mode -
> >      value down. A value of zero stops the motion if one is in progress
> >      and has no effect otherwise.
> >
> > +``V4L2_CID_UNIT_CELL_SIZE (struct)``
> > +    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.
> > +    The unit cell consist on the whole area of the pixel, sensitive and
> > +    non-sensitive.
>
> "consists of", otherwise this looks unambiguous to me.
>
Thanks, fixing on v3. Will send after I get more feedback



> I'm not sure if it is required to add a table for struct v4l2_area,
> similarly to the other compound controls.
>
> > +    This control is required for automatic calibration sensors/cameras.
> > +
> >  .. [#f1]
> >     This control may be changed to a menu control in the future, if more
> >     options are required.
>
> regards
> Philipp

Re: [PATCH v2 1/3] media: add V4L2_CID_UNIT_CELL_SIZE control

[Hans Verkuil]

On 8/20/19 11:40 AM, 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@kernel.org>
> ---
>  drivers/media/v4l2-core/v4l2-ctrls.c | 11 +++++++++++
>  include/media/v4l2-ctrls.h           |  2 ++
>  include/uapi/linux/v4l2-controls.h   |  3 +++
>  include/uapi/linux/videodev2.h       | 11 +++++++++++
>  4 files changed, 27 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index cd1ae016706f..ec949453a081 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -978,6 +978,7 @@ 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! */
> @@ -1357,6 +1358,9 @@ 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;
> +		break;
>  	default:
>  		*type = V4L2_CTRL_TYPE_INTEGER;
>  		break;
> @@ -1423,6 +1427,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  	case V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT:
>  	case V4L2_CID_RDS_RX_TRAFFIC_PROGRAM:
>  	case V4L2_CID_RDS_RX_MUSIC_SPEECH:
> +	case V4L2_CID_UNIT_CELL_SIZE:
>  		*flags |= V4L2_CTRL_FLAG_READ_ONLY;
>  		break;
>  	case V4L2_CID_RF_TUNER_PLL_LOCK:
> @@ -1705,6 +1710,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
>  	case V4L2_CTRL_TYPE_FWHT_PARAMS:
>  		break;
>  
> +	case V4L2_CTRL_TYPE_AREA:
> +		break;
> +
>  	case V4L2_CTRL_TYPE_H264_SPS:
>  	case V4L2_CTRL_TYPE_H264_PPS:
>  	case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
> @@ -2403,6 +2411,9 @@ 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..1332eabd27b1 100644
> --- a/include/uapi/linux/v4l2-controls.h
> +++ b/include/uapi/linux/v4l2-controls.h
> @@ -912,6 +912,9 @@ enum v4l2_auto_focus_range {
>  #define V4L2_CID_PAN_SPEED			(V4L2_CID_CAMERA_CLASS_BASE+32)
>  #define V4L2_CID_TILT_SPEED			(V4L2_CID_CAMERA_CLASS_BASE+33)
>  
> +#define V4L2_CID_UNIT_CELL_SIZE			(V4L2_CID_CAMERA_CLASS_BASE+34)
> +
> +
>  /* FM Modulator class control IDs */
>  
>  #define V4L2_CID_FM_TX_CLASS_BASE		(V4L2_CTRL_CLASS_FM_TX | 0x900)
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 2427bc4d8eba..751e2065ac02 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
>    *
> @@ -1718,6 +1723,12 @@ 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,
> +	 */
> +	V4L2_CTRL_TYPE_AREA    = 0x0106,

This new type should be documented.

Regards,

	Hans

>  };
>  
>  /*  Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
> 

Re: [PATCH v2 3/3] media: imx214: Add new control with V4L2_CID_UNIT_CELL_SIZE

[Philipp Zabel]

On Tue, 2019-08-20 at 11:40 +0200, Ricardo Ribalda Delgado wrote:
> 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@kernel.org>
> ---
>  drivers/media/i2c/imx214.c | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
> index 159a3a604f0e..cc0a013ba7da 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;

This is never used.

Neither are pixel_rate and exposure, it appears. And link_freq is only
used locally in imx214_probe to set the read-only flag.

>  
>  	struct regulator_bulk_data	supplies[IMX214_NUM_SUPPLIES];
>  
> @@ -941,6 +942,26 @@ static int __maybe_unused imx214_resume(struct device *dev)
>  	return ret;
>  }
>  
> +static void unit_size_init(const struct v4l2_ctrl *ctrl, u32 idx,
> +		     union v4l2_ctrl_ptr ptr)
> +{
> +	ptr.p_area->width = 1120;
> +	ptr.p_area->height = 1120;
> +}
> +
> +static const struct v4l2_ctrl_type_ops unit_size_ops = {
> +	.init = unit_size_init,
> +};
> +
> +static struct v4l2_ctrl *new_unit_size_ctrl(struct v4l2_ctrl_handler *handler)
> +{
> +	static struct v4l2_ctrl_config ctrl = {
> +		.id = V4L2_CID_UNIT_CELL_SIZE,
> +		.type_ops = &unit_size_ops,
> +	};
> +
> +	return v4l2_ctrl_new_custom(handler, &ctrl, NULL);
> +}
>  static int imx214_probe(struct i2c_client *client)
>  {
>  	struct device *dev = &client->dev;
> @@ -1029,6 +1050,8 @@ static int imx214_probe(struct i2c_client *client)
>  					     V4L2_CID_EXPOSURE,
>  					     0, 3184, 1, 0x0c70);
>  
> +	imx214->unit_size = new_unit_size_ctrl(&imx214->ctrls);
> +
>  	ret = imx214->ctrls.error;
>  	if (ret) {
>  		dev_err(&client->dev, "%s control init failed (%d)\n",

This seems like a lot of parts to assemble in every sensor driver just
to provide a constant area control. Should this be turned into a
v4l2_ctrl_new_area helper that takes a const struct v4l2_area as an
argument?

	static const struct v4l2_area unit_cell_size = {
		.width = 1120,
		.height = 1120
	};

	v4l2_ctrl_new_area(&imx214->ctrls, V4L2_CID_UNIT_CELL_SIZE,
			   &unit_cell_size);

regards
Philipp

Re: [PATCH v2 3/3] media: imx214: Add new control with V4L2_CID_UNIT_CELL_SIZE

[Ricardo Ribalda Delgado]

Hi Philipp

On Thu, Aug 22, 2019 at 11:31 AM Philipp Zabel <p.zabel@pengutronix.de> wrote:
>
> On Tue, 2019-08-20 at 11:40 +0200, Ricardo Ribalda Delgado wrote:
> > 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@kernel.org>
> > ---
> >  drivers/media/i2c/imx214.c | 23 +++++++++++++++++++++++
> >  1 file changed, 23 insertions(+)
> >
> > diff --git a/drivers/media/i2c/imx214.c b/drivers/media/i2c/imx214.c
> > index 159a3a604f0e..cc0a013ba7da 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;
>
> This is never used.
>
> Neither are pixel_rate and exposure, it appears. And link_freq is only
> used locally in imx214_probe to set the read-only flag.
>
> >
> >       struct regulator_bulk_data      supplies[IMX214_NUM_SUPPLIES];
> >
> > @@ -941,6 +942,26 @@ static int __maybe_unused imx214_resume(struct device *dev)
> >       return ret;
> >  }
> >
> > +static void unit_size_init(const struct v4l2_ctrl *ctrl, u32 idx,
> > +                  union v4l2_ctrl_ptr ptr)
> > +{
> > +     ptr.p_area->width = 1120;
> > +     ptr.p_area->height = 1120;
> > +}
> > +
> > +static const struct v4l2_ctrl_type_ops unit_size_ops = {
> > +     .init = unit_size_init,
> > +};
> > +
> > +static struct v4l2_ctrl *new_unit_size_ctrl(struct v4l2_ctrl_handler *handler)
> > +{
> > +     static struct v4l2_ctrl_config ctrl = {
> > +             .id = V4L2_CID_UNIT_CELL_SIZE,
> > +             .type_ops = &unit_size_ops,
> > +     };
> > +
> > +     return v4l2_ctrl_new_custom(handler, &ctrl, NULL);
> > +}
> >  static int imx214_probe(struct i2c_client *client)
> >  {
> >       struct device *dev = &client->dev;
> > @@ -1029,6 +1050,8 @@ static int imx214_probe(struct i2c_client *client)
> >                                            V4L2_CID_EXPOSURE,
> >                                            0, 3184, 1, 0x0c70);
> >
> > +     imx214->unit_size = new_unit_size_ctrl(&imx214->ctrls);
> > +
> >       ret = imx214->ctrls.error;
> >       if (ret) {
> >               dev_err(&client->dev, "%s control init failed (%d)\n",
>
> This seems like a lot of parts to assemble in every sensor driver just
> to provide a constant area control. Should this be turned into a
> v4l2_ctrl_new_area helper that takes a const struct v4l2_area as an
> argument?

I agree, I was planning on making a helper afterwards ;). I do not
mind adding it to this series.

>
>         static const struct v4l2_area unit_cell_size = {
>                 .width = 1120,
>                 .height = 1120
>         };
>
>         v4l2_ctrl_new_area(&imx214->ctrls, V4L2_CID_UNIT_CELL_SIZE,
>                            &unit_cell_size);
>
> regards
> Philipp