# Maintainer: Natanael Copa <ncopa@alpinelinux.org>

pkgname=linux-rpi
pkgver=4.4.39
case $pkgver in
*.*.*)	_kernver=${pkgver%.*};;
*.*)	_kernver=${pkgver};;
esac
pkgrel=0
pkgdesc="Linux kernel with Raspberry Pi patches"
url=https://github.com/raspberrypi/linux
depends="mkinitfs linux-firmware"
makedepends="perl installkernel bash gmp-dev bc"
options="!strip"
install=
# rpi patches are git diff against latest release tag from:
# linux-4.4.y       https://github.com/raspberrypi/linux/tree/rpi-4.4.y
# rpi-cirrus-4.4.y  https://github.com/HiassofT/rpi-linux/tree/cirrus-4.4.y
source="http://ftp.kernel.org/pub/linux/kernel/v4.x/linux-$_kernver.tar.xz
	http://ftp.kernel.org/pub/linux/kernel/v4.x/patch-$pkgver.xz
	http://dev.alpinelinux.org/~tteras/rpi/linux-4.4.y-rpi-20161115.patch
	http://dev.alpinelinux.org/~tteras/rpi/rpi-cirrus-4.4.y-20160909.patch
	gpio-mcp23s08-pullups.patch
	rotary-encoder-fix.patch
	issue-4973.patch

	config-rpi.armhf
	config-rpi2.armhf
	markdt
	"
subpackages=""
_flavors=
for _i in $source; do
	case $_i in
	config-*.$CARCH)
		_f=${_i%.$CARCH}
		_f=${_f#config-}
		_flavors="$_flavors ${_f}"
		[ "linux-$_f" != "$pkgname" ] && subpackages="$subpackages linux-${_f}"
		subpackages="$subpackages linux-${_f}-dev:_${_f}_dev"
		;;
	esac
done

arch="armhf"
license="GPL2"

prepare() {
	local _patch_failed=
	cd "$srcdir"/linux-$_kernver
	if [ "${pkgver%.0}" = "$pkgver" ]; then
		msg "Applying patch-$pkgver.xz"
		unxz -c < "$srcdir"/patch-$pkgver.xz | patch -p1 -N || return 1
	fi

	# first apply patches in specified order
	for i in $source; do
		case $i in
		*.patch)
			msg "Applying $i..."
			if ! patch -s -p1 -N -i "$srcdir"/${i##*/}; then
				echo $i >>failed
				_patch_failed=1
			fi
			;;
		esac
	done

	if ! [ -z "$_patch_failed" ]; then
		error "The following patches failed:"
		cat failed
		return 1
	fi

	# remove localversion from patch if any
	rm -f localversion*

	for i in $_flavors; do
		local _config=config-$i.${CARCH}
		local _builddir="$srcdir"/build-$i
		mkdir -p "$_builddir"
		echo "-$pkgrel-$i" > "$srcdir"/build-$i/localversion-alpine \
			|| return 1

		cp "$srcdir"/$_config "$_builddir"/.config || return 1
		make -C "$srcdir"/linux-$_kernver \
			O="$_builddir" \
			HOSTCC="${CC:-gcc}" \
			silentoldconfig || return 1
	done
}

build() {
	for i in $_flavors; do
		cd "$srcdir"/build-$i
		make CC="${CC:-gcc} -fno-pie" \
			KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-Alpine" \
			|| return 1
	done
}

_package() {
	local _buildflavor="$1" _outdir="$2"
	local _abi_release=${pkgver}-${pkgrel}-${_buildflavor}

	cd "$srcdir"/build-$_buildflavor || return 1

	mkdir -p "$_outdir"/boot "$_outdir"/lib/modules

	local _install
	case "$CARCH" in
	arm*)
		_install="zinstall dtbs_install"
		;;
	*)
		_install=install
		;;
	esac

	cd "$srcdir"/build-$_buildflavor || return 1
	make -j1 modules_install firmware_install $_install \
		INSTALL_MOD_PATH="$_outdir" \
		INSTALL_PATH="$_outdir"/boot \
		INSTALL_DTBS_PATH="$_outdir"/usr/lib/linux-${_abi_release} \
		|| return 1

	# tell rpi bootloader we are device tree capable
	"$srcdir"/markdt "$_outdir"/boot/vmlinuz-$_buildflavor \
		|| return 1

	rm -f "$_outdir"/lib/modules/${_abi_release}/build \
		"$_outdir"/lib/modules/${_abi_release}/source
	rm -rf "$_outdir"/lib/firmware

	install -D include/config/kernel.release \
		"$_outdir"/usr/share/kernel/$_buildflavor/kernel.release
}

# main flavor installs in $pkgdir
package() {
	_package rpi "$pkgdir"
}

_dev() {
	local _abi_release=${pkgver}-${pkgrel}-$1
	# copy the only the parts that we really need for build 3rd party
	# kernel modules and install those as /usr/src/linux-headers,
	# simlar to what ubuntu does
	#
	# this way you dont need to install the 300-400 kernel sources to
	# build a tiny kernel module
	#
	pkgdesc="Headers and script for third party modules for $1 grsec kernel"
	depends="gmp-dev bash"
	local dir="$subpkgdir"/usr/src/linux-headers-${_abi_release}

	# first we import config, run prepare to set up for building
	# external modules, and create the scripts
	mkdir -p "$dir"
	cp "$srcdir"/config-$1.${CARCH} "$dir"/.config
	make -j1 -C "$srcdir"/linux-$_kernver O="$dir" HOSTCC="${CC:-gcc}" \
		silentoldconfig prepare modules_prepare scripts

	# remove the stuff that poits to real sources. we want 3rd party
	# modules to believe this is the soruces
	rm "$dir"/Makefile "$dir"/source

	# copy the needed stuff from real sources
	#
	# this is taken from ubuntu kernel build script
	# http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-jaunty.git;a=blob;f=debian/rules.d/3-binary-indep.mk;hb=HEAD
	cd "$srcdir"/linux-$_kernver
	find . -path './include/*' -prune -o -path './scripts/*' -prune \
		-o -type f \( -name 'Makefile*' -o -name 'Kconfig*' \
		-o -name 'Kbuild*' -o -name '*.sh' -o -name '*.pl' \
		-o -name '*.lds' \) | cpio -pdm "$dir"
	cp -a drivers/media/dvb/dvb-core/*.h "$dir"/drivers/media/dvb/dvb-core
	cp -a drivers/media/video/*.h "$dir"/drivers/media/video
	cp -a drivers/media/dvb/frontends/*.h "$dir"/drivers/media/dvb/frontends
	cp -a scripts include "$dir"
	find $(find arch -name include -type d -print) -type f \
		| cpio -pdm "$dir"

	install -Dm644 "$srcdir"/build-$1/Module.symvers \
		"$dir"/Module.symvers

	mkdir -p "$subpkgdir"/lib/modules/${_abi_release}
	ln -sf /usr/src/linux-headers-${_abi_release} \
		"$subpkgdir"/lib/modules/${_abi_release}/build
}

for _f in $_flavors; do
	[ "linux-$_f" != "$pkgname" ] && eval "${_f}() { _package "$_f" "$subpkgdir"; }"
	eval "_${_f}_dev() { _dev $_f; }"
done

md5sums="9a78fa2eb6c68ca5a40ed5af08142599  linux-4.4.tar.xz
62185f1a06241fca5cd94109f3dada4b  patch-4.4.39.xz
478a76b0c9aa31575c67dabbef88609a  linux-4.4.y-rpi-20161115.patch
0ef4cc8955f879dccf859932c86963e7  rpi-cirrus-4.4.y-20160909.patch
b66e8aa4991ca5c2ccd61559ed7e6491  gpio-mcp23s08-pullups.patch
5508d2b3e5967bd57f92f551d90b3e54  rotary-encoder-fix.patch
29281b74d2cef6965fa4ab6d826a2aa4  issue-4973.patch
1e8797d614a89984954523245ccbd237  config-rpi.armhf
c188e45c15e82c57f0a624b415c73c46  config-rpi2.armhf
e587cae1dca2f5992555d9bcf53deecf  markdt"
sha256sums="401d7c8fef594999a460d10c72c5a94e9c2e1022f16795ec51746b0d165418b2  linux-4.4.tar.xz
fc2b60d221aeaf3eafec4f36f299e4002be81da85117c3f59963fdcb6facb929  patch-4.4.39.xz
359d44c515f581319994a0824b2522ac1290e17b2b317956bdb329c15eb22697  linux-4.4.y-rpi-20161115.patch
5235b8c8a81dceb8fa525f45edfdd31876f72ca6207d43d3c72b2c6d0ed194e5  rpi-cirrus-4.4.y-20160909.patch
b389a556bbd98053881b43deef1adf20640f980557c5f37cfd7ece2daeecbda9  gpio-mcp23s08-pullups.patch
ab6740577fe8c1d71d2c716720ebbbf9a750985963d6938093b4ca9194b6e871  rotary-encoder-fix.patch
3a16e927ce53a8c56e7f1dd86fe8ad08b1c06466f5206c521a7e2de1e4796d6c  issue-4973.patch
86825369de54822d49aa4ea2f23822f6c29ba00baf8f41f6b983c8cc4ccfc765  config-rpi.armhf
3f2b9916a143816f747f3c8fd1a117fba297df756258304215ae24da37860a09  config-rpi2.armhf
0f6681fc5c3590e1dbe13a2bde796403bd1529cf0fe19720899eaa0db79bcb49  markdt"
sha512sums="13c8459933a8b80608e226a1398e3d1848352ace84bcfb7e6a4a33cb230bbe1ab719d4b58e067283df91ce5311be6d2d595fc8c19e2ae6ecc652499415614b3e  linux-4.4.tar.xz
c4ab325bb4d49bc3fd12d55bb3c98aecdcd165aee6146afe4548607188bcb4f3ca18c8bf0c6f77fdac79b2c03c8ef369c4ac1ee9ed281362e54ab1e6298c48da  patch-4.4.39.xz
1f9616e89424ae2d4c6b402242ed05971f055a699493d3814ab26bb8723876e5e8c7723ce5509233f080615746a2b674a6ac43e6866677c7234efb7efc2b7fbb  linux-4.4.y-rpi-20161115.patch
a00d5172b9075d36e72a1f80071221f39257eeb448a9692d22c6480c7d242de60520e1829eb06314706379c95b8b52b4e131a24415e61a6a5ee0afb2ed818331  rpi-cirrus-4.4.y-20160909.patch
36724ba56cb8fdf3a3d347cffb67ae1cc3d7b1052d526b6b5134ebf6baae9f9724b586c97833453dc7697ab24699426f0749af78b6a80be36967a80033a0cf40  gpio-mcp23s08-pullups.patch
3a711e2cdb6c0ecaceb3755437d38626dec8403e8aa167a6e16f64d8a8b7cc5bdc7e04aa7c05938719ebc90e319ec4124ee2151a7855e7838ee143b62d140ad0  rotary-encoder-fix.patch
501c91bf2538a18102da59bbccc3097f9c3c90079acc0e946ff075074160c09b8a66934e5ce5470e170f0e4f93d114709a95230367426d0bb7ea02c4bdf4cc9b  issue-4973.patch
1c543ca5d08df99c1249fe8beb69b42eb3c985cd36b568cc6b0fa5b56951f702c790e6d2c2e51e46173179eb6cb39ee13fa8314a7277a55589bd9ccdd826c88f  config-rpi.armhf
3fe9eb7090e9e2794c36e057796e88bf9c138cc0cd2e3fd7a8e466f683ff9c38102dec8ed0cfb9e0b17a999490212ec14762d549ebc1ca7179d7efa86fec50d7  config-rpi2.armhf
a4ecd1f48db64f9d6a189250d1937d7f2cd3a049a3d24cc527d04d05db06137722f1ba44bcd6033794781c3f2cfe2fbe065410a16de4bfdf4b1cd95d89322a77  markdt"