From 8dbbff7b75eee842c00ebaa53fa0a34b3e9bbcaa Mon Sep 17 00:00:00 2001 From: Naushir Patuck 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 --- 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 @@ -1333,6 +1333,7 @@ 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