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52 lines
2.4 KiB
Diff
52 lines
2.4 KiB
Diff
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From fa9c40c42f2db87e80ac4a89df6a5ecab1b98031 Mon Sep 17 00:00:00 2001
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From: David Plowman <david.plowman@raspberrypi.com>
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Date: Mon, 16 Aug 2021 13:39:08 +0200
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Subject: [PATCH] media: v4l2-ctrls: Add V4L2_CID_NOTIFY_GAINS control
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commit a9c80593ff80ddb7c6496624e5384e1ea3460a72 upstream.
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We add a new control V4L2_CID_NOTIFY_GAINS which allows the sensor to
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be notified what gains will be applied to the different colour
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channels by subsequent processing (such as by an ISP), even though the
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sensor will not apply any of these gains itself.
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For Bayer sensors this will be an array control taking 4 values which
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are the 4 gains arranged in the fixed order B, Gb, Gr and R,
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irrespective of the exact Bayer order of the sensor itself. The use of
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an array makes it straightforward to extend this control to non-Bayer
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sensors (for example, sensors with an RGBW pattern) in future.
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The units are in all cases linear with the default value indicating a
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gain of exactly 1.0. For example, if the default value were reported as
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128 then the value 192 would represent a gain of exactly 1.5.
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Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
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Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
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Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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---
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drivers/media/v4l2-core/v4l2-ctrls-defs.c | 1 +
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include/uapi/linux/v4l2-controls.h | 1 +
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2 files changed, 2 insertions(+)
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--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
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+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
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@@ -1109,6 +1109,7 @@ const char *v4l2_ctrl_get_name(u32 id)
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case V4L2_CID_TEST_PATTERN_GREENR: return "Green (Red) Pixel Value";
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case V4L2_CID_TEST_PATTERN_BLUE: return "Blue Pixel Value";
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case V4L2_CID_TEST_PATTERN_GREENB: return "Green (Blue) Pixel Value";
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+ case V4L2_CID_NOTIFY_GAINS: return "Notify Gains";
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/* Image processing controls */
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/* Keep the order of the 'case's the same as in v4l2-controls.h! */
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--- a/include/uapi/linux/v4l2-controls.h
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+++ b/include/uapi/linux/v4l2-controls.h
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@@ -1123,6 +1123,7 @@ enum v4l2_jpeg_chroma_subsampling {
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#define V4L2_CID_TEST_PATTERN_BLUE (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 6)
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#define V4L2_CID_TEST_PATTERN_GREENB (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 7)
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#define V4L2_CID_UNIT_CELL_SIZE (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 8)
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+#define V4L2_CID_NOTIFY_GAINS (V4L2_CID_IMAGE_SOURCE_CLASS_BASE + 9)
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/* Image processing controls */
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