media: vicodec: add the virtual codec driver

Add the virtual codec driver that uses the Fast Walsh Hadamard Transform.

Keiichi Watanabe contributed the multiplanar support.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Co-Developed-by: Keiichi Watanabe <keiichiw@chromium.org>
Signed-off-by: Keiichi Watanabe <keiichiw@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

MAINTAINERS

@@ -15153,6 +15153,14 @@ L:	netdev@vger.kernel.org
 S:	Maintained
 F:	drivers/net/ethernet/via/via-velocity.*
 
+VICODEC VIRTUAL CODEC DRIVER
+M:	Hans Verkuil <hans.verkuil@cisco.com>
+L:	linux-media@vger.kernel.org
+T:	git git://linuxtv.org/media_tree.git
+W:	https://linuxtv.org
+S:	Maintained
+F:	drivers/media/platform/vicodec/*
+
 VIDEO MULTIPLEXER DRIVER
 M:	Philipp Zabel <p.zabel@pengutronix.de>
 L:	linux-media@vger.kernel.org

drivers/media/platform/Kconfig

@@ -514,6 +514,9 @@ config VIDEO_VIM2M
 	---help---
 	  This is a virtual test device for the memory-to-memory driver
 	  framework.
+
+source "drivers/media/platform/vicodec/Kconfig"
+
 endif #V4L_TEST_DRIVERS
 
 menuconfig DVB_PLATFORM_DRIVERS

drivers/media/platform/Makefile

@@ -16,6 +16,7 @@ obj-$(CONFIG_VIDEO_VIU) += fsl-viu.o
 obj-$(CONFIG_VIDEO_VIMC)		+= vimc/
 obj-$(CONFIG_VIDEO_VIVID)		+= vivid/
 obj-$(CONFIG_VIDEO_VIM2M)		+= vim2m.o
+obj-$(CONFIG_VIDEO_VICODEC)		+= vicodec/
 
 obj-$(CONFIG_VIDEO_TI_VPE)		+= ti-vpe/
 

drivers/media/platform/vicodec/Kconfig

@@ -0,0 +1,13 @@
+config VIDEO_VICODEC
+	tristate "Virtual Codec Driver"
+	depends on VIDEO_DEV && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	select VIDEOBUF2_VMALLOC
+	select V4L2_MEM2MEM_DEV
+	default n
+	help
+	  Driver for a Virtual Codec
+
+	  This driver can be compared to the vim2m driver for emulating
+	  a video device node that exposes an emulated hardware codec.
+
+	  When in doubt, say N.

drivers/media/platform/vicodec/Makefile

@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+vicodec-objs := vicodec-core.o vicodec-codec.o
+
+obj-$(CONFIG_VIDEO_VICODEC) += vicodec.o