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

[Ricardo Ribalda Delgado <ribalda@kernel.org>]

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