86 lines
3.6 KiB
Diff
86 lines
3.6 KiB
Diff
From 2f43e72bd136b5e69dbc6453555d8c5fecbb9d3a Mon Sep 17 00:00:00 2001
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From: Naushir Patuck <naush@raspberrypi.com>
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Date: Wed, 1 Apr 2020 08:46:29 +0100
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Subject: [PATCH] media: uapi: v4l2-core: Add sensor ancillary data
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V4L2 foucc type.
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Add V4L2_META_FMT_SENSOR_DATA format 4CC.
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This new format will be used by the BCM2835 Unicam device to return
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out camera sensor embedded data.
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Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
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---
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.../userspace-api/media/v4l/meta-formats.rst | 1 +
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.../media/v4l/pixfmt-meta-sensor-data.rst | 32 +++++++++++++++++++
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drivers/media/v4l2-core/v4l2-ioctl.c | 1 +
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include/uapi/linux/videodev2.h | 1 +
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4 files changed, 35 insertions(+)
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create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-meta-sensor-data.rst
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--- a/Documentation/userspace-api/media/v4l/meta-formats.rst
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+++ b/Documentation/userspace-api/media/v4l/meta-formats.rst
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@@ -15,6 +15,7 @@ These formats are used for the :ref:`met
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pixfmt-meta-d4xx
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pixfmt-meta-intel-ipu3
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pixfmt-meta-rkisp1
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+ pixfmt-meta-sensor-data
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pixfmt-meta-uvc
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pixfmt-meta-vsp1-hgo
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pixfmt-meta-vsp1-hgt
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--- /dev/null
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+++ b/Documentation/userspace-api/media/v4l/pixfmt-meta-sensor-data.rst
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@@ -0,0 +1,32 @@
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+.. Permission is granted to copy, distribute and/or modify this
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+.. document under the terms of the GNU Free Documentation License,
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+.. Version 1.1 or any later version published by the Free Software
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+.. Foundation, with no Invariant Sections, no Front-Cover Texts
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+.. and no Back-Cover Texts. A copy of the license is included at
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+.. Documentation/media/uapi/fdl-appendix.rst.
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+..
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+.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
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+
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+.. _v4l2-meta-fmt-sensor-data:
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+
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+***********************************
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+V4L2_META_FMT_SENSOR_DATA ('SENS')
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+***********************************
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+
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+Sensor Ancillary Metadata
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+
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+Description
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+===========
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+
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+This format describes ancillary data generated by a camera sensor and
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+transmitted over a stream on the camera bus. Sensor vendors generally have their
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+own custom format for this ancillary data. Some vendors follow a generic
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+CSI-2/SMIA embedded data format as described in the `CSI-2 specification.
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+<https://mipi.org/specifications/csi-2>`_
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+
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+The size of the embedded buffer is defined as a single line with a pixel width
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+width specified in bytes. This is obtained by a call to the
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+:c:type:`VIDIOC_SUBDEV_G_FMT` ioctl on the sensor subdevice where the ``pad``
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+field in :c:type:`v4l2_subdev_format` is set to 1. Note that this size is fixed
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+and cannot be modified with a call to :c:type:`VIDIOC_SUBDEV_S_FMT`.
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+
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--- a/drivers/media/v4l2-core/v4l2-ioctl.c
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+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
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@@ -1422,6 +1422,7 @@ static void v4l_fill_fmtdesc(struct v4l2
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case V4L2_META_FMT_UVC: descr = "UVC Payload Header Metadata"; break;
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case V4L2_META_FMT_D4XX: descr = "Intel D4xx UVC Metadata"; break;
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case V4L2_META_FMT_VIVID: descr = "Vivid Metadata"; break;
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+ case V4L2_META_FMT_SENSOR_DATA: descr = "Sensor Ancillary Metadata"; break;
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default:
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/* Compressed formats */
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--- a/include/uapi/linux/videodev2.h
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+++ b/include/uapi/linux/videodev2.h
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@@ -778,6 +778,7 @@ struct v4l2_pix_format {
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#define V4L2_META_FMT_UVC v4l2_fourcc('U', 'V', 'C', 'H') /* UVC Payload Header metadata */
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#define V4L2_META_FMT_D4XX v4l2_fourcc('D', '4', 'X', 'X') /* D4XX Payload Header metadata */
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#define V4L2_META_FMT_VIVID v4l2_fourcc('V', 'I', 'V', 'D') /* Vivid Metadata */
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+#define V4L2_META_FMT_SENSOR_DATA v4l2_fourcc('S', 'E', 'N', 'S') /* Sensor Ancillary metadata */
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/* priv field value to indicates that subsequent fields are valid. */
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#define V4L2_PIX_FMT_PRIV_MAGIC 0xfeedcafe
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