Merge pull request #33 from hekkup/master

Added USB & V4L modules to the build script

tools/README.md

@@ -3,6 +3,8 @@ In this subsection, I've included tools and instructions for those who want to b
 `build-kernel-qemu` script helps one to automate kernel building process for any debian based distro.
 The ARM toolchain can be found in the debian package gcc-arm-linux-gnueabihf or at https://github.com/raspberrypi/tools. For other OSes, like windows or Mac OS X, one can have similar tools like gcc-arm-linux-gnueabihf- and other dependencies and refer `build-kernel-qemu` line by line to build the kernel.
 
+If you enable USB webcam modules in the build script, make sure that the correct drivers for your web camera are selected in menuconfig. A word of warning, though: USB works in Qemu in general but USB web cameras have some problems actually.
+
 Please note that `build-kernel-qemu` is not an original work of mine and credit for it goes to the original author (https://github.com/johnlane).
 
 I've taken building references from the links below:

tools/build-kernel-qemu

@@ -10,6 +10,7 @@ COMMIT=raspberrypi-kernel_1.20161100-1
 COMMIT=""
 INSTALL_PACKAGES=""
 USE_GIT=1
+USB_WEBCAM_MODULES=""    # add USB & V4L modules for USB webcam support (didn't work as static)
 
 if [ -f build-kernel-qemu.conf ] ; then
 	. build-kernel-qemu.conf
@@ -26,7 +27,7 @@ if [ "$USE_GIT" ] ; then
 	if [ ! -d linux ] ; then
 		git clone https://github.com/raspberrypi/linux.git
 	else
-		echo "using existing linux sources!"
+		echo "Using existing Linux sources!"
 	fi
 	cd linux
 	if [ "$COMMIT" ] ; then
@@ -44,7 +45,9 @@ patch -p1 < ../linux-arm.patch
 
 make ARCH=arm versatile_defconfig
 KERNEL_VERSION=$(make kernelversion)
-echo "building qemu raspberry pi kernel kernel-qemu-$KERNEL_VERSION"
+KERNEL_TARGET_FILE_NAME=../qemu-kernel-$KERNEL_VERSION
+MODULES_INSTALL_PATH=../qemu-kernel-$KERNEL_VERSION-modules
+echo "Building Qemu Raspberry Pi kernel qemu-kernel-$KERNEL_VERSION"
 
 cat >> .config << EOF
 CONFIG_CROSS_COMPILE="$TOOLCHAIN"
@@ -89,9 +92,55 @@ CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
 EOF
 
+if [ $USB_WEBCAM_MODULES ] ; then
+echo "Make sure you have drivers for your webcam selected in menuconfig"
+echo >> .config << EOF
+# won't work as statically linked
+CONFIG_MEDIA_SUPPORT=m
+CONFIG_VIDEO_DEV=m
+CONFIG_VIDEO_V4L2_COMMON=m
+CONFIG_VIDEO_MEDIA=m
+CONFIG_VIDEO_V4L2=m
+CONFIG_VIDEO_CAPTURE_DRIVERS=m
+CONFIG_V4L_USB_DRIVERS=m
+CONFIG_USB_VIDEO_CLASS=m
+CONFIG_VIDEO_CORE=m
+CONFIG_VIDEO_VIDEOBUF2=m
+CONFIG_INPUT_CORE=m
+CONFIG_VIDEO_UVC=m
+
+CONFIG_USB=m
+CONFIG_USB_STORAGE=m
+CONFIG_USB_EHCI_HCD=m
+CONFIG_USB_OHCI_HCD=m
+CONFIG_USB_UHCI_HCD=m
+CONFIG_USB_VHCI_HCD=m
+CONFIG_USB_GSPCA=m
+CONFIG_VIDEO_GSPCA=m
+
+CONFIG_I2C=m
+
+# won't be accepted as modules so linking statically
+CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV=y
+CONFIG_MEDIA_CAMERA_SUPPORT=y
+EOF
+fi
+
 cat ../config_ip_tables >> .config
 
 make -j 4 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}- menuconfig
 make -j 4 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}- bzImage
-cp arch/arm/boot/zImage ../kernel-qemu-$KERNEL_VERSION
+cp arch/arm/boot/zImage $KERNEL_TARGET_FILE_NAME
+
+if [ $USB_WEBCAM_MODULES ] ; then
+    mkdir -p $MODULES_INSTALL_PATH
+    if [ ! -d $MODULES_INSTALL_PATH ] ; then
+        echo "Couldn't create webcam modules install directory $MODULES_INSTALL_PATH"
+    fi
+    make -j 4 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}- modules
+    make -j 4 -k ARCH=arm CROSS_COMPILE=${TOOLCHAIN}- \
+        INSTALL_MOD_PATH=$MODULES_INSTALL_PATH modules_install
+    echo "Copy modules to Raspberry to /lib/modules/$KERNEL_VERSION"
+fi
+
 cd ..