| From 8dbbff7b75eee842c00ebaa53fa0a34b3e9bbcaa Mon Sep 17 00:00:00 2001 |
| From: Naushir Patuck <naush@raspberrypi.com> |
| Date: Thu, 23 Apr 2020 10:20:26 +0100 |
| Subject: [PATCH] media: uapi: v4l2-core: Add ISP statistics output |
| V4L2 fourcc type |
| |
| Add V4L2_META_FMT_BCM2835_ISP_STATS V4L2 format type. |
| |
| This new format will be used by the BCM2835 ISP device to return |
| out ISP statistics for 3A. |
| |
| Signed-off-by: Naushir Patuck <naush@raspberrypi.com> |
| --- |
| Documentation/media/uapi/v4l/meta-formats.rst | 1 + |
| .../v4l/pixfmt-meta-bcm2835-isp-stats.rst | 41 +++++++++++++++++++ |
| drivers/media/v4l2-core/v4l2-ioctl.c | 1 + |
| include/uapi/linux/videodev2.h | 1 + |
| 4 files changed, 44 insertions(+) |
| create mode 100644 Documentation/media/uapi/v4l/pixfmt-meta-bcm2835-isp-stats.rst |
| |
| --- a/Documentation/media/uapi/v4l/meta-formats.rst |
| +++ b/Documentation/media/uapi/v4l/meta-formats.rst |
| @@ -19,6 +19,7 @@ These formats are used for the :ref:`met |
| .. toctree:: |
| :maxdepth: 1 |
| |
| + pixfmt-meta-bcm2835-isp-stats |
| pixfmt-meta-d4xx |
| pixfmt-meta-intel-ipu3 |
| pixfmt-meta-sensor-data |
| --- /dev/null |
| +++ b/Documentation/media/uapi/v4l/pixfmt-meta-bcm2835-isp-stats.rst |
| @@ -0,0 +1,41 @@ |
| +.. 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-bcm2835-isp-stats: |
| + |
| +***************************************** |
| +V4L2_META_FMT_BCM2835_ISP_STATS ('BSTA') |
| +***************************************** |
| + |
| +BCM2835 ISP Statistics |
| + |
| +Description |
| +=========== |
| + |
| +The BCM2835 ISP hardware calculate image statistics for an input Bayer frame. |
| +These statistics are obtained from the "bcm2835-isp0-capture3" device node |
| +using the :c:type:`v4l2_meta_format` interface. They are formatted as described |
| +by the :c:type:`bcm2835_isp_stats` structure below. |
| + |
| +.. code-block:: c |
| + |
| + #define DEFAULT_AWB_REGIONS_X 16 |
| + #define DEFAULT_AWB_REGIONS_Y 12 |
| + |
| + #define NUM_HISTOGRAMS 2 |
| + #define NUM_HISTOGRAM_BINS 128 |
| + #define AWB_REGIONS (DEFAULT_AWB_REGIONS_X * DEFAULT_AWB_REGIONS_Y) |
| + #define FLOATING_REGIONS 16 |
| + #define AGC_REGIONS 16 |
| + #define FOCUS_REGIONS 12 |
| + |
| +.. kernel-doc:: include/uapi/linux/bcm2835-isp.h |
| + :functions: bcm2835_isp_stats_hist bcm2835_isp_stats_region |
| + bcm2835_isp_stats_focus bcm2835_isp_stats |
| + |
| --- a/drivers/media/v4l2-core/v4l2-ioctl.c |
| +++ b/drivers/media/v4l2-core/v4l2-ioctl.c |
| @@ -1351,6 +1351,7 @@ 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_SENSOR_DATA: descr = "Sensor Ancillary Metadata"; break; |
| + case V4L2_META_FMT_BCM2835_ISP_STATS: descr = "BCM2835 ISP Image Statistics"; break; |
| |
| default: |
| /* Compressed formats */ |
| --- a/include/uapi/linux/videodev2.h |
| +++ b/include/uapi/linux/videodev2.h |
| @@ -769,6 +769,7 @@ 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_SENSOR_DATA v4l2_fourcc('S', 'E', 'N', 'S') /* Sensor Ancillary metadata */ |
| +#define V4L2_META_FMT_BCM2835_ISP_STATS v4l2_fourcc('B', 'S', 'T', 'A') /* BCM2835 ISP image statistics output */ |
| |
| /* priv field value to indicates that subsequent fields are valid. */ |
| #define V4L2_PIX_FMT_PRIV_MAGIC 0xfeedcafe |