staging: vc04_services: ISP: Add a more complex ISP processing component

Driver for the BCM2835 ISP hardware block.  This driver uses the MMAL
component to program the ISP hardware through the VC firmware.

The ISP component can produce two video stream outputs, and Bayer
image statistics. This can't be encompassed in a simple V4L2
M2M device, so create a new device that registers 4 video nodes.

This patch squashes all the development patches from the earlier
rpi-5.4.y branch into one

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>

Author: naushir

MAINTAINERS

@@ -4182,6 +4182,15 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/media/brcm,bcm2835-unicam.yaml
 F:	drivers/media/platform/broadcom/bcm2835-unicam*
 
+BROADCOM BCM2835 ISP DRIVER
+M:	Raspberry Pi Kernel Maintenance <kernel-list@raspberrypi.com>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+F:	Documentation/media/uapi/v4l/pixfmt-meta-bcm2835-isp-stats.rst
+F:	Documentation/media/v4l-drivers/bcm2835-isp.rst
+F:	drivers/staging/vc04_services/bcm2835-isp
+F:	include/uapi/linux/bcm2835-isp.h
+
 BROADCOM BCM2711 HEVC DECODER
 M:	Raspberry Pi Kernel Maintenance <kernel-list@raspberrypi.com>
 L:	linux-media@vger.kernel.org

drivers/staging/vc04_services/Kconfig

@@ -52,6 +52,7 @@ source "drivers/staging/vc04_services/bcm2835-camera/Kconfig"
 
 source "drivers/staging/vc04_services/vc-sm-cma/Kconfig"
 source "drivers/staging/vc04_services/bcm2835-codec/Kconfig"
+source "drivers/staging/vc04_services/bcm2835-isp/Kconfig"
 
 source "drivers/staging/vc04_services/vchiq-mmal/Kconfig"
 

drivers/staging/vc04_services/Makefile

@@ -16,4 +16,5 @@ obj-$(CONFIG_VIDEO_BCM2835)		+= bcm2835-camera/
 obj-$(CONFIG_BCM2835_VCHIQ_MMAL)	+= vchiq-mmal/
 obj-$(CONFIG_BCM_VC_SM_CMA)		+= vc-sm-cma/
 obj-$(CONFIG_VIDEO_CODEC_BCM2835)	+= bcm2835-codec/
+obj-$(CONFIG_VIDEO_ISP_BCM2835)		+= bcm2835-isp/
 

drivers/staging/vc04_services/bcm2835-isp/Kconfig

@@ -0,0 +1,14 @@
+config VIDEO_ISP_BCM2835
+	tristate "BCM2835 ISP support"
+	depends on MEDIA_SUPPORT
+	depends on VIDEO_DEV && (ARCH_BCM2835 || COMPILE_TEST)
+	depends on MEDIA_CONTROLLER
+	select BCM2835_VCHIQ_MMAL
+	select VIDEOBUF2_DMA_CONTIG
+	help
+	  This is the V4L2 driver for the Broadcom BCM2835 ISP hardware.
+	  This operates over the VCHIQ interface to a service running on
+	  VideoCore.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called bcm2835-isp.

drivers/staging/vc04_services/bcm2835-isp/Makefile

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+bcm2835-isp-objs := bcm2835-v4l2-isp.o
+
+obj-$(CONFIG_VIDEO_ISP_BCM2835) += bcm2835-isp.o
+
+ccflags-y += \
+	-I$(srctree)/drivers/staging/vc04_services \
+	-D__VCCOREVER__=0x04000000

drivers/staging/vc04_services/bcm2835-isp/bcm2835-isp-ctrls.h

@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Broadcom BCM2835 ISP driver
+ *
+ * Copyright © 2019-2020 Raspberry Pi (Trading) Ltd.
+ *
+ * Author: Naushir Patuck (naush@raspberrypi.com)
+ *
+ */
+
+#ifndef BCM2835_ISP_CTRLS
+#define BCM2835_ISP_CTRLS
+
+#include <linux/bcm2835-isp.h>
+
+struct bcm2835_isp_custom_ctrl {
+	const char *name;
+	u32 id;
+	u32 size;
+	u32 flags;
+};
+
+static const struct bcm2835_isp_custom_ctrl custom_ctrls[] = {
+	{
+		.name	= "Colour Correction Matrix",
+		.id	= V4L2_CID_USER_BCM2835_ISP_CC_MATRIX,
+		.size	= sizeof(struct bcm2835_isp_custom_ccm),
+		.flags  = 0
+	}, {
+		.name	= "Lens Shading",
+		.id	= V4L2_CID_USER_BCM2835_ISP_LENS_SHADING,
+		.size	= sizeof(struct bcm2835_isp_lens_shading),
+		.flags  = V4L2_CTRL_FLAG_EXECUTE_ON_WRITE
+	}, {
+		.name	= "Black Level",
+		.id	= V4L2_CID_USER_BCM2835_ISP_BLACK_LEVEL,
+		.size	= sizeof(struct bcm2835_isp_black_level),
+		.flags  = 0
+	}, {
+		.name	= "Green Equalisation",
+		.id	= V4L2_CID_USER_BCM2835_ISP_GEQ,
+		.size	= sizeof(struct bcm2835_isp_geq),
+		.flags  = 0
+	}, {
+		.name	= "Gamma",
+		.id	= V4L2_CID_USER_BCM2835_ISP_GAMMA,
+		.size	= sizeof(struct bcm2835_isp_gamma),
+		.flags  = 0
+	}, {
+		.name	= "Sharpen",
+		.id	= V4L2_CID_USER_BCM2835_ISP_SHARPEN,
+		.size	= sizeof(struct bcm2835_isp_sharpen),
+		.flags  = 0
+	}, {
+		.name	= "Denoise",
+		.id	= V4L2_CID_USER_BCM2835_ISP_DENOISE,
+		.size	= sizeof(struct bcm2835_isp_denoise),
+		.flags  = 0
+	}, {
+		.name	= "Defective Pixel Correction",
+		.id	= V4L2_CID_USER_BCM2835_ISP_DPC,
+		.size	= sizeof(struct bcm2835_isp_dpc),
+		.flags  = 0
+	}
+};
+
+#endif