git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From 2f43e72bd136b5e69dbc6453555d8c5fecbb9d3a Mon Sep 17 00:00:00 2001
   2 From: Naushir Patuck <naush@raspberrypi.com>
   3 Date: Wed, 1 Apr 2020 08:46:29 +0100
   4 Subject: [PATCH] media: uapi: v4l2-core: Add sensor ancillary data
   5  V4L2 foucc type.
   6
   7 Add V4L2_META_FMT_SENSOR_DATA format 4CC.
   8
   9 This new format will be used by the BCM2835 Unicam device to return
  10 out camera sensor embedded data.
  11
  12 Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
  13 ---
  14  .../userspace-api/media/v4l/meta-formats.rst  |  1 +
  15  .../media/v4l/pixfmt-meta-sensor-data.rst     | 32 +++++++++++++++++++
  16  drivers/media/v4l2-core/v4l2-ioctl.c          |  1 +
  17  include/uapi/linux/videodev2.h                |  1 +
  18  4 files changed, 35 insertions(+)
  19  create mode 100644 Documentation/userspace-api/media/v4l/pixfmt-meta-sensor-data.rst
  20
  21 --- a/Documentation/userspace-api/media/v4l/meta-formats.rst
  22 +++ b/Documentation/userspace-api/media/v4l/meta-formats.rst
  23 @@ -15,6 +15,7 @@ These formats are used for the :ref:`met
  24      pixfmt-meta-d4xx
  25      pixfmt-meta-intel-ipu3
  26      pixfmt-meta-rkisp1
  27 +    pixfmt-meta-sensor-data
  28      pixfmt-meta-uvc
  29      pixfmt-meta-vsp1-hgo
  30      pixfmt-meta-vsp1-hgt
  31 --- /dev/null
  32 +++ b/Documentation/userspace-api/media/v4l/pixfmt-meta-sensor-data.rst
  33 @@ -0,0 +1,32 @@
  34 +.. Permission is granted to copy, distribute and/or modify this
  35 +.. document under the terms of the GNU Free Documentation License,
  36 +.. Version 1.1 or any later version published by the Free Software
  37 +.. Foundation, with no Invariant Sections, no Front-Cover Texts
  38 +.. and no Back-Cover Texts. A copy of the license is included at
  39 +.. Documentation/media/uapi/fdl-appendix.rst.
  40 +..
  41 +.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections
  42 +
  43 +.. _v4l2-meta-fmt-sensor-data:
  44 +
  45 +***********************************
  46 +V4L2_META_FMT_SENSOR_DATA  ('SENS')
  47 +***********************************
  48 +
  49 +Sensor Ancillary Metadata
  50 +
  51 +Description
  52 +===========
  53 +
  54 +This format describes ancillary data generated by a camera sensor and
  55 +transmitted over a stream on the camera bus. Sensor vendors generally have their
  56 +own custom format for this ancillary data. Some vendors follow a generic
  57 +CSI-2/SMIA embedded data format as described in the `CSI-2 specification.
  58 +<https://mipi.org/specifications/csi-2>`_
  59 +
  60 +The size of the embedded buffer is defined as a single line with a pixel width
  61 +width specified in bytes. This is obtained by a call to the
  62 +:c:type:`VIDIOC_SUBDEV_G_FMT` ioctl on the sensor subdevice where the ``pad``
  63 +field in :c:type:`v4l2_subdev_format` is set to 1.  Note that this size is fixed
  64 +and cannot be modified with a call to :c:type:`VIDIOC_SUBDEV_S_FMT`.
  65 +
  66 --- a/drivers/media/v4l2-core/v4l2-ioctl.c
  67 +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
  68 @@ -1404,6 +1404,7 @@ static void v4l_fill_fmtdesc(struct v4l2
  69         case V4L2_META_FMT_UVC:         descr = "UVC Payload Header Metadata"; break;
  70         case V4L2_META_FMT_D4XX:        descr = "Intel D4xx UVC Metadata"; break;
  71         case V4L2_META_FMT_VIVID:       descr = "Vivid Metadata"; break;
  72 +       case V4L2_META_FMT_SENSOR_DATA: descr = "Sensor Ancillary Metadata"; break;
  73
  74         default:
  75                 /* Compressed formats */
  76 --- a/include/uapi/linux/videodev2.h
  77 +++ b/include/uapi/linux/videodev2.h
  78 @@ -778,6 +778,7 @@ struct v4l2_pix_format {
  79  #define V4L2_META_FMT_UVC         v4l2_fourcc('U', 'V', 'C', 'H') /* UVC Payload Header metadata */
  80  #define V4L2_META_FMT_D4XX        v4l2_fourcc('D', '4', 'X', 'X') /* D4XX Payload Header metadata */
  81  #define V4L2_META_FMT_VIVID      v4l2_fourcc('V', 'I', 'V', 'D') /* Vivid Metadata */
  82 +#define V4L2_META_FMT_SENSOR_DATA v4l2_fourcc('S', 'E', 'N', 'S') /* Sensor Ancillary metadata */
  83
  84  /* priv field value to indicates that subsequent fields are valid. */
  85  #define V4L2_PIX_FMT_PRIV_MAGIC                0xfeedcafe