bcm2835: add v4l2 camera device

- Supports raw YUV capture, preview, JPEG and H264.
- Uses videobuf2 for data transfer, using dma_buf.
- Uses 3.6.10 timestamping
- Camera power based on use
- Uses immutable input mode on video encoder

Signed-off-by: Daniel Stone <[email protected]>
Signed-off-by: Luke Diamand <[email protected]>

Author: Vincent Sanders

Documentation/video4linux/bcm2835-v4l2.txt

@@ -0,0 +1,60 @@
+
+BCM2835 (aka Raspberry Pi) V4L2 driver
+======================================
+
+1. Copyright
+============
+
+Copyright © 2013 Raspberry Pi (Trading) Ltd.
+
+2. License
+==========
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+3. Quick Start
+==============
+
+You need a version 1.0 or later of v4l2-ctl, available from:
+	git://git.linuxtv.org/v4l-utils.git
+
+$ sudo modprobe bcm2835-v4l2
+
+Turn on the overlay:
+
+$ v4l2-ctl --overlay=1
+
+Turn off the overlay:
+
+$ v4l2-ctl --overlay=0
+
+Set the capture format for video:
+
+$ v4l2-ctl  --set-fmt-video=width=1920,height=1088,pixelformat=4
+
+(Note: 1088 not 1080).
+
+Capture:
+
+$ v4l2-ctl --stream-mmap=3 --stream-count=100 --stream-to=somefile.h264
+
+Stills capture:
+
+$ v4l2-ctl  --set-fmt-video=width=2592,height=1944,pixelformat=3
+$ v4l2-ctl --stream-mmap=3 --stream-count=1 --stream-to=somefile.jpg
+
+List of available formats:
+
+$ v4l2-ctl --list-formats

drivers/media/platform/Kconfig

@@ -124,6 +124,7 @@ config VIDEO_S3C_CAMIF
 source "drivers/media/platform/soc_camera/Kconfig"
 source "drivers/media/platform/exynos4-is/Kconfig"
 source "drivers/media/platform/s5p-tv/Kconfig"
+source "drivers/media/platform/bcm2835/Kconfig"
 
 endif # V4L_PLATFORM_DRIVERS
 

drivers/media/platform/Makefile

@@ -50,4 +50,6 @@ obj-y	+= davinci/
 
 obj-$(CONFIG_ARCH_OMAP)	+= omap/
 
+obj-$(CONFIG_VIDEO_BCM2835)		+= bcm2835/
+
 ccflags-y += -I$(srctree)/drivers/media/i2c

drivers/media/platform/bcm2835/Kconfig

@@ -0,0 +1,25 @@
+# Broadcom VideoCore IV v4l2 camera support
+
+config VIDEO_BCM2835
+	bool "Broadcom BCM2835 camera interface driver"
+	depends on VIDEO_V4L2 && ARCH_BCM2708
+	---help---
+	  Say Y here to enable camera host interface devices for
+	  Broadcom BCM2835 SoC. This operates over the VCHIQ interface
+	  to a service running on VideoCore.
+
+
+if VIDEO_BCM2835
+
+config VIDEO_BCM2835_MMAL
+	tristate "Broadcom BM2835 MMAL camera interface driver"
+	depends on BCM2708_VCHIQ
+	select VIDEOBUF2_VMALLOC
+	---help---
+	  This is a V4L2 driver for the Broadcom BCM2835 MMAL camera host interface
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called bcm2835-v4l2.o
+
+
+endif # VIDEO_BM2835

drivers/media/platform/bcm2835/Makefile

@@ -0,0 +1,5 @@
+bcm2835-v4l2-objs := bcm2835-camera.o controls.o mmal-vchiq.o
+
+obj-$(CONFIG_VIDEO_BCM2835_MMAL) += bcm2835-v4l2.o
+
+ccflags-$(CONFIG_VIDEO_BCM2835) += -Idrivers/misc/vc04_services -Idrivers/misc/vc04_services/interface/vcos/linuxkernel -D__VCCOREVER__=0x04000000