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