linux-kernel - [RFC 1/2] media: Add exposure and gain controls for multiple captures

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Message-ID: <20250710220544.89066-2-mirela.rabulea@nxp.com>
Date: Fri, 11 Jul 2025 01:05:43 +0300
From: Mirela Rabulea <mirela.rabulea@....com>
To: mchehab@...nel.org,
	sakari.ailus@...ux.intel.com,
	hverkuil-cisco@...all.nl,
	laurent.pinchart+renesas@...asonboard.com,
	ribalda@...omium.org,
	jai.luthra@...asonboard.com,
	laurentiu.palcu@....com
Cc: linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	LnxRevLi@....com,
	julien.vuillaumier@....com,
	celine.laurencin@....com
Subject: [RFC 1/2] media: Add exposure and gain controls for multiple captures

Add V4L2_CID_EXPOSURE_MULTI, V4L2_CID_AGAIN_MULTI and
V4L2_CID_DGAIN_MULTI for exposure and gain control for
multiple exposure sensors.

Signed-off-by: Mirela Rabulea <mirela.rabulea@....com>
---
 drivers/media/v4l2-core/v4l2-ctrls-defs.c | 8 ++++++++
 include/uapi/linux/v4l2-controls.h        | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
index 1ea52011247a..65c468a3b01c 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -1155,6 +1155,9 @@ const char *v4l2_ctrl_get_name(u32 id)
 	case V4L2_CID_TEST_PATTERN_BLUE:	return "Blue Pixel Value";
 	case V4L2_CID_TEST_PATTERN_GREENB:	return "Green (Blue) Pixel Value";
 	case V4L2_CID_NOTIFY_GAINS:		return "Notify Gains";
+	case V4L2_CID_EXPOSURE_MULTI:		return "Exposure, Multiple Captures";
+	case V4L2_CID_AGAIN_MULTI:		return "Analog Gain, Multiple Captures";
+	case V4L2_CID_DGAIN_MULTI:		return "Digital Gain, Multiple Captures";
 
 	/* Image processing controls */
 	/* Keep the order of the 'case's the same as in v4l2-controls.h! */
@@ -1607,6 +1610,11 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
 	case V4L2_CID_COLORIMETRY_HDR10_MASTERING_DISPLAY:
 		*type = V4L2_CTRL_TYPE_HDR10_MASTERING_DISPLAY;
 		break;
+	case V4L2_CID_EXPOSURE_MULTI:
+	case V4L2_CID_AGAIN_MULTI:
+	case V4L2_CID_DGAIN_MULTI:
+		*type = V4L2_CTRL_TYPE_U32;
+		break;
 	default:
 		*type = V4L2_CTRL_TYPE_INTEGER;
 		break;
diff --git a/include/uapi/linux/v4l2-controls.h b/include/uapi/linux/v4l2-controls.h
index 974fd254e573..0d5a34a6578e 100644
--- a/include/uapi/linux/v4l2-controls.h
+++ b/include/uapi/linux/v4l2-controls.h
@@ -1213,6 +1213,9 @@ enum v4l2_jpeg_chroma_subsampling {
 #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)
 #define V4L2_CID_NOTIFY_GAINS			(V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 9)
+#define V4L2_CID_EXPOSURE_MULTI			(V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 10)
+#define V4L2_CID_AGAIN_MULTI			(V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 11)
+#define V4L2_CID_DGAIN_MULTI			(V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 12)
 
 
 /* Image processing controls */
-- 
2.43.0