170 lines
5.9 KiB
Diff
170 lines
5.9 KiB
Diff
From 23afbeb993acfd94fa21341f01819ab6505444d2 Mon Sep 17 00:00:00 2001
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From: Naushir Patuck <naush@raspberrypi.com>
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Date: Tue, 21 Apr 2020 15:06:19 +0100
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Subject: [PATCH] media: uapi: v4l-ctrls: Add CID base for the
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bcm2835-isp driver
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We are reserving controls for the new bcm2835-isp driver.
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Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
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---
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.../media/v4l-drivers/bcm2835-isp.rst | 127 ++++++++++++++++++
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Documentation/media/v4l-drivers/index.rst | 1 +
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include/uapi/linux/v4l2-controls.h | 4 +
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3 files changed, 132 insertions(+)
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create mode 100644 Documentation/media/v4l-drivers/bcm2835-isp.rst
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--- /dev/null
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+++ b/Documentation/media/v4l-drivers/bcm2835-isp.rst
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@@ -0,0 +1,127 @@
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+.. SPDX-License-Identifier: GPL-2.0
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+
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+BCM2835 ISP Driver
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+==================
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+
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+Introduction
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+------------
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+
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+The BCM2835 Image Sensor Pipeline (ISP) is a fixed function hardware pipeline
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+for performing image processing operations. Images are fed to the input
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+of the ISP through memory frame buffers. These images may be in various YUV,
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+RGB, or Bayer formats. A typical use case would have Bayer images obtained from
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+an image sensor by the BCM2835 Unicam peripheral, written to a memory
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+frame buffer, and finally fed into the input of the ISP. Two concurrent output
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+images may be generated in YUV or RGB format at different resolutions.
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+Statistics output is also generated for Bayer input images.
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+
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+The bcm2835-isp driver exposes the following media pads as V4L2 device nodes:
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+
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+.. tabularcolumns:: |l|l|l|l|
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+
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+.. cssclass: longtable
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+
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+.. flat-table::
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+
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+ * - *Pad*
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+ - *Direction*
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+ - *Purpose*
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+ - *Formats*
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+
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+ * - "bcm2835-isp0-output0"
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+ - sink
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+ - Accepts Bayer, RGB or YUV format frame buffers as input to the ISP HW
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+ pipeline.
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+ - :ref:`RAW8 <V4L2-PIX-FMT-SRGGB8>`,
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+ :ref:`RAW10P <V4L2-PIX-FMT-SRGGB10P>`,
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+ :ref:`RAW12P <V4L2-PIX-FMT-SRGGB12P>`,
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+ :ref:`RAW14P <V4L2-PIX-FMT-SRGGB14P>`,
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+ :ref:`RAW16 <V4L2-PIX-FMT-SRGGB16>`,
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+ :ref:`RGB24/BGR24 <V4L2-PIX-FMT-RGB24>`,
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+ :ref:`YUYV <V4L2-PIX-FMT-YUYV>`,
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+ :ref:`YVYU <V4L2-PIX-FMT-YVYU>`,
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+ :ref:`UYVY <V4L2-PIX-FMT-UYVY>`,
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+ :ref:`VYUY <V4L2-PIX-FMT-VYUY>`,
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+ :ref:`YUV420/YVU420 <V4L2-PIX-FMT-YUV420>`
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+
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+ * - "bcm2835-isp0-capture1"
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+ - source
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+ - High resolution YUV or RGB processed output from the ISP.
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+ - :ref:`RGB565 <V4L2-PIX-FMT-RGB565>`,
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+ :ref:`RGB24/BGR24 <V4L2-PIX-FMT-RGB24>`,
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+ :ref:`ABGR32 <V4L2-PIX-FMT-ABGR32>`,
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+ :ref:`YUYV <V4L2-PIX-FMT-YUYV>`,
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+ :ref:`YVYU <V4L2-PIX-FMT-YVYU>`,
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+ :ref:`UYVY <V4L2-PIX-FMT-UYVY>`,
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+ :ref:`VYUY <V4L2-PIX-FMT-VYUY>`.
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+ :ref:`YUV420/YVU420 <V4L2-PIX-FMT-YUV420>`,
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+ :ref:`NV12/NV21 <V4L2-PIX-FMT-NV12>`,
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+
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+ * - "bcm2835-isp0-capture2"
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+ - source
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+ - Low resolution YUV processed output from the ISP. The output of
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+ this pad cannot have a resolution larger than the "bcm2835-isp0-capture1" pad in any dimension.
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+ - :ref:`YUYV <V4L2-PIX-FMT-YUYV>`,
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+ :ref:`YVYU <V4L2-PIX-FMT-YVYU>`,
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+ :ref:`UYVY <V4L2-PIX-FMT-UYVY>`,
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+ :ref:`VYUY <V4L2-PIX-FMT-VYUY>`.
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+ :ref:`YUV420/YVU420 <V4L2-PIX-FMT-YUV420>`,
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+ :ref:`NV12/NV21 <V4L2-PIX-FMT-NV12>`,
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+
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+ * - "bcm2835-isp0-capture1"
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+ - source
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+ - Image statistics calculated from the input image provided on the
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+ "bcm2835-isp0-output0" pad. Statistics are only available for Bayer
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+ format input images.
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+ - :ref:`v4l2-meta-fmt-bcm2835-isp-stats`.
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+
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+Pipeline Configuration
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+----------------------
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+
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+The ISP pipeline can be configure through user-space by calling
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+:ref:`VIDIOC_S_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` on the “bcm2835-isp0-output0”
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+node with the appropriate parameters as shown in the table below.
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+
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+.. tabularcolumns:: |p{2cm}|p{5.0cm}|
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+
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+.. cssclass: longtable
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+
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+.. flat-table::
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+
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+ * - *id*
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+ - *Parameter*
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_CC_MATRIX``
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+ - struct :c:type:`bcm2835_isp_custom_ccm`
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_LENS_SHADING``
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+ - struct :c:type:`bcm2835_isp_lens_shading`
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_BLACK_LEVEL``
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+ - struct :c:type:`bcm2835_isp_black_level`
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_GEQ``
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+ - struct :c:type:`bcm2835_isp_geq`
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_GAMMA``
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+ - struct :c:type:`bcm2835_isp_gamma`
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_DENOISE``
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+ - struct :c:type:`bcm2835_isp_denoise`
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_SHARPEN``
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+ - struct :c:type:`bcm2835_isp_sharpen`
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+
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+ * - ``V4L2_CID_USER_BCM2835_ISP_DPC``
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+ - struct :c:type:`bcm2835_isp_dpc`
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+
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+++++++++++++++++++++++++
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+Configuration Parameters
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+++++++++++++++++++++++++
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+
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+.. kernel-doc:: include/uapi/linux/bcm2835-isp.h
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+ :functions: bcm2835_isp_rational bcm2835_isp_ccm bcm2835_isp_custom_ccm
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+ bcm2835_isp_gain_format bcm2835_isp_lens_shading
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+ bcm2835_isp_black_level bcm2835_isp_geq bcm2835_isp_gamma
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+ bcm2835_isp_denoise bcm2835_isp_sharpen
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+ bcm2835_isp_dpc_mode bcm2835_isp_dpc
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--- a/Documentation/media/v4l-drivers/index.rst
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+++ b/Documentation/media/v4l-drivers/index.rst
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@@ -35,6 +35,7 @@ For more details see the file COPYING in
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v4l-with-ir
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tuners
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cardlist
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+ bcm2835-isp
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bttv
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cafe_ccic
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cpia2
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--- a/include/uapi/linux/v4l2-controls.h
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+++ b/include/uapi/linux/v4l2-controls.h
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@@ -192,6 +192,10 @@ enum v4l2_colorfx {
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* We reserve 16 controls for this driver. */
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#define V4L2_CID_USER_IMX_BASE (V4L2_CID_USER_BASE + 0x10b0)
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+/* The base for the bcm2835-isp driver controls.
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+ * We reserve 16 controls for this driver. */
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+#define V4L2_CID_USER_BCM2835_ISP_BASE (V4L2_CID_USER_BASE + 0x10c0)
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+
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/* MPEG-class control IDs */
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/* The MPEG controls are applicable to all codec controls
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* and the 'MPEG' part of the define is historical */
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