planet-geminipda: new device (Planet Gemini PDA) (!155)

Integrate Gemini PDA support into master from old branch:
https://github.com/postmarketOS/pmbootstrap/commits/device-planet-geminipda

Most of hybris-related changes (besides KWin) was merged, so it is just
device and kernel aports now.

The state of hardware support is unchanged from:
https://wiki.postmarketos.org/wiki/Planet_Computers_Gemini_PDA_(planet-geminipda)

Without hybris, it can boot to graphics with X11 fbdev driver, the
included config enables correct rotation (as it has portrait display,
but usable only in landscape).

For running it with hybris, which can allow for 3D acceleration, we need
a way to package and provide large LXC image for running Halium Android
container. Lately Adam Boardman from Gemini PDA community also got voice
calls working in Debian install with a mix of SailfishOS middleware and
Ubuntu Touch applications, which could be probably adapted for
postmarketOS if needed.

device/device-planet-geminipda/10-geminipda-loopback-device.sh

+#!/bin/sh
+. /etc/deviceinfo
+. ./init_functions.sh
+
+mount_loopback_device() {
+	loopback_img=postmarketOS.img
+	partitions="/dev/mmcblk0p29 /dev/mmcblk0p30 /dev/mmcblk0p31"
+
+	mkdir /tmpmnt
+	for part in $partitions; do
+		mount -o ro $part /tmpmnt
+
+		if [ -f "/tmpmnt/$loopback_img" ]; then
+			mount -o remount,rw /tmpmnt
+			loopback_device=$(losetup -f)
+			losetup $loopback_device "/tmpmnt/$loopback_img"
+			kpartx -afs $loopback_device
+			return 0
+		fi
+
+		umount /tmpmnt
+	done
+}
+
+mount_loopback_device

device/device-planet-geminipda/20-fbdev.conf

+Section "Device"
+    Identifier      "Framebuffer device"
+    Driver          "fbdev"
+    Option          "Rotate" "CCW"
+EndSection

device/device-planet-geminipda/40-hwcomposer.conf

+Section "Device"
+    Identifier      "HWComposer device"
+    Driver          "hwcomposer"
+    Option          "Rotate" "CCW"
+EndSection

device/device-planet-geminipda/APKBUILD

+# Reference: <https://postmarketos.org/devicepkg>
+pkgname="device-planet-geminipda"
+pkgdesc="Gemini PDA"
+pkgver=0.1
+pkgrel=0
+url="https://postmarketos.org"
+license="MIT"
+arch="aarch64"
+options="!check !archcheck"
+depends="postmarketos-base linux-planet-geminipda mkbootimg"
+makedepends="devicepkg-dev"
+source="deviceinfo
+	10-geminipda-loopback-device.sh
+	20-fbdev.conf
+	40-hwcomposer.conf"
+subpackages="$pkgname-hybris"
+
+build() {
+	devicepkg_build $startdir $pkgname
+}
+
+package() {
+	devicepkg_package $startdir $pkgname
+
+	install -Dm644 "$srcdir"/10-geminipda-loopback-device.sh \
+		"$pkgdir"/etc/postmarketos-mkinitfs/hooks/10-geminipda-loopback-device.sh
+
+	install -Dm644 "$srcdir"/20-fbdev.conf \
+		"$pkgdir"/etc/X11/xorg.conf.d/20-fbdev.conf
+}
+
+hybris() {
+	depends="lxc-android
+		libhybris-7.1 libhybris-egl libhybris-gles libhybris-libwayland-egl
+		xf86-video-hwcomposer xf86-video-hwcomposer-7.1"
+
+	install -Dm644 "$srcdir"/40-hwcomposer.conf \
+		"$subpkgdir"/etc/X11/xorg.conf.d/40-hwcomposer.conf
+}
+
+sha512sums="273a79f621df7d40f4b10e4845fbd7147b060e5b2eadd3e5c93d25b5cc029b0e4dfe32fd0f1f827b2512ee7da942aa4186d872e4174e90dd08370dfae312784d  deviceinfo
+a8b6623a0a8bea1ab3e28582f203426e42aed477be9ca1d6147d090f9f9d080a69c262a47f9dd5cd8ce99a9bf64912d902dc881f97967873466ebe73d9bba587  10-geminipda-loopback-device.sh
+07bda3435dffec7f8e8e158266cb619fb41c6b04a49a605e76fa88bc33be3cb27fdc54c8664be0738bab2c7a8054ce3d7563036323bf04762dcf735064ac10a2  20-fbdev.conf
+785bd225025fb73900dca06b70b2d62fdf4145d1c035b1b03fb0f82a10cc09eff63ec551ead4e1ee780a6b6f348c3f82fd068f6efa6f4e34205600d752f38913  40-hwcomposer.conf"

device/device-planet-geminipda/deviceinfo

+# Reference: <https://postmarketos.org/deviceinfo>
+# Please use double quotes only. You can source this file in shell scripts.
+
+deviceinfo_format_version="0"
+deviceinfo_name="Planet Gemini PDA"
+deviceinfo_manufacturer="Planet"
+deviceinfo_codename="planet-geminipda"
+deviceinfo_date=""
+deviceinfo_dtb=""
+deviceinfo_modules_initfs=""
+deviceinfo_arch="aarch64"
+
+# Device related
+deviceinfo_keyboard="true"
+deviceinfo_external_storage="true"
+deviceinfo_screen_width="1080"
+deviceinfo_screen_height="2160"
+deviceinfo_dev_touchscreen=""
+deviceinfo_dev_touchscreen_calibration=""
+deviceinfo_dev_keyboard=""
+
+# Bootloader related
+deviceinfo_flash_method="fastboot"
+deviceinfo_kernel_cmdline="bootopt=64S3,32N2,64N2 androidboot.selinux=permissive buildvariant=userdebug selinux=1"
+deviceinfo_generate_bootimg="true"
+deviceinfo_bootimg_qcdt="false"
+deviceinfo_flash_offset_base="0x40080000"
+deviceinfo_flash_offset_kernel="0x00000000"
+deviceinfo_flash_offset_ramdisk="0x04f80000"
+deviceinfo_flash_offset_second="0x00e80000"
+deviceinfo_flash_offset_tags="0x03f80000"
+deviceinfo_flash_pagesize="2048"

device/linux-planet-geminipda/APKBUILD

+# Reference: <https://postmarketos.org/vendorkernel>
+# Kernel config based on: arch/arm64/configs/aeon6797_6m_n_halium_defconfig
+
+pkgname="linux-planet-geminipda"
+pkgver=3.18.41
+pkgrel=0
+pkgdesc="Gemini PDA kernel fork"
+arch="aarch64"
+_carch="arm64"
+_flavor="planet-geminipda"
+url="https://kernel.org"
+license="GPL-2.0-only"
+options="!strip !check !tracedeps"
+makedepends="perl sed installkernel bash gmp-dev bc linux-headers elfutils-dev devicepkg-dev gcc6 python"
+
+# Compiler: GCC 6 (doesn't boot when compiled with newer versions)
+if [ "${CC:0:5}" != "gcc6-" ]; then
+	CC="gcc6-$CC"
+	HOSTCC="gcc6-gcc"
+	CROSS_COMPILE="gcc6-$CROSS_COMPILE"
+fi
+
+# Source
+_repository="gemini-linux-kernel-3.18"
+_commit="bf7daa4483d5dce94c9d478fc28854f5978d60da"
+_config="config-${_flavor}.${arch}"
+source="
+	$pkgname-$_commit.tar.gz::https://github.com/gemian/${_repository}/archive/${_commit}.tar.gz
+	$_config
+"
+builddir="$srcdir/${_repository}-${_commit}"
+
+prepare() {
+	default_prepare
+
+	# support newer GCC versions
+	cp -v "/usr/share/devicepkg-dev/compiler-gcc.h" "$builddir/include/linux/"
+
+	# Remove -Werror from all makefiles
+	makefiles="$(find "$builddir" -type f -name Makefile)
+		$(find "$builddir" -type f -name Kbuild)"
+	for i in $makefiles; do
+		sed -i 's/-Werror-/-W/g' "$i"
+		sed -i 's/-Werror//g' "$i"
+	done
+
+	# Device kernel must(!) be build out-of-tree to avoid include errors
+	mkdir -p "$builddir"/KERNEL_OBJ
+
+	# Prepare kernel config ('yes ""' for kernels lacking olddefconfig)
+	cp "$srcdir"/$_config "$builddir"/KERNEL_OBJ/.config
+	yes "" | make -C "$builddir" ARCH="$_carch" HOSTCC="$HOSTCC" \
+		O="$builddir"/KERNEL_OBJ oldconfig
+}
+
+build() {
+	unset LDFLAGS
+	make ARCH="$_carch" CC="${CC:-gcc}" \
+		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS" \
+		O="$builddir"/KERNEL_OBJ
+}
+
+package() {
+	# kernel.release
+	install -D "$builddir/KERNEL_OBJ/include/config/kernel.release" \
+		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"
+
+	# zImage (find the right one)
+	cd "$builddir/KERNEL_OBJ/arch/$_carch/boot"
+	_target="$pkgdir/boot/vmlinuz-$_flavor"
+	for _zimg in zImage-dtb Image.gz-dtb *zImage Image; do
+		[ -e "$_zimg" ] || continue
+		msg "zImage found: $_zimg"
+		install -Dm644 "$_zimg" "$_target"
+		break
+	done
+	if ! [ -e "$_target" ]; then
+		error "Could not find zImage in $PWD!"
+		return 1
+	fi
+}
+
+sha512sums="84579ba59ada9166794ec02843616049128c199f9c68b519d3e33056822a22d12921b6589ff058d08e580e877a227a124f999f041e29b6d81a8fde7ce7480b11  linux-planet-geminipda-bf7daa4483d5dce94c9d478fc28854f5978d60da.tar.gz
+019e2cb30c6d61b37c5c6c5f583da5be42e37bb7eb695bba4dc30dfe91196d3f20ba57ae3ac6931f9ea4cbf4a7c2cdd95f603191e387c3e292b667049a4e9876  config-planet-geminipda.aarch64"