device-samsung-herolte: new device (Samsung Galaxy S7) (!314)

This is basically just the packages for the Galaxy S7 Edge (hero2lte).
I only needed to change a few Kernel config options, so that the
colors are displayed correctly. The options regarding
CONFIG_PANEL_S6E3HF4_WQHD and CONFIG_PANEL_S6E3HA3_DYNAMIC probably
solve this issue, but I modified the other options as well. I got the
differences by diffing:
arch/arm64/configs/exynos8890-{hero2lte,herolte}_defconfig

Booting, USB networking and the display work! I can't say anything about
flashing via heimdall as this tool scares me. Following what WilliamO7
wrote on the device page, I flashed it by sideloading the android
recovery zip.

[ci:skip-build]: already built successfully in CI

device/device-samsung-herolte/APKBUILD

@@ -0,0 +1,26 @@
+# Reference: <https://postmarketos.org/devicepkg>
+pkgname="device-samsung-herolte"
+pkgdesc="Samsung Galaxy S7"
+pkgver=0.1
+pkgrel=0
+url="https://postmarketos.org"
+license="MIT"
+arch="aarch64"
+options="!check !archcheck"
+depends="postmarketos-base linux-samsung-herolte mkbootimg mesa-dri-swrast msm-fb-refresher"
+makedepends="devicepkg-dev"
+source="deviceinfo initfs-hook.sh"
+
+build() {
+	devicepkg_build $startdir $pkgname
+}
+
+package() {
+	devicepkg_package $startdir $pkgname
+	install -Dm644 "$srcdir"/initfs-hook.sh \
+		"$pkgdir"/etc/postmarketos-mkinitfs/hooks/00-${pkgname}.sh
+}
+
+
+sha512sums="c273794d0f9b16f14020d8165ec8413ee243511743e9c48c3245cc7390419889c8e8b6ffef2e066b5b1f97fb473848da22990ba067293e8b22caaad537b9067a  deviceinfo
+5a7be3cb8835ffb3783fcd4539de04f7f006c726ac9aea35cdca9e90b2877dc36cf4e314851bf9078f4b2dac061b7265866792d92a79f5232c56a0e17f7910b1  initfs-hook.sh"

device/device-samsung-herolte/deviceinfo

@@ -0,0 +1,36 @@
+# Reference: <https://postmarketos.org/deviceinfo>
+# Please use double quotes only. You can source this file in shell scripts.
+
+deviceinfo_format_version="0"
+deviceinfo_name="Samsung Galaxy S7"
+deviceinfo_manufacturer="Samsung"
+deviceinfo_codename="samsung-herolte"
+deviceinfo_date=""
+deviceinfo_dtb=""
+deviceinfo_modules_initfs=""
+deviceinfo_arch="aarch64"
+
+# Device related
+deviceinfo_keyboard="false"
+deviceinfo_external_storage="true"
+deviceinfo_screen_width="1440"
+deviceinfo_screen_height="2560"
+deviceinfo_dev_touchscreen=""
+deviceinfo_dev_touchscreen_calibration=""
+deviceinfo_dev_keyboard=""
+
+# Bootloader related
+deviceinfo_flash_method="heimdall-bootimg"
+deviceinfo_kernel_cmdline="buildvariant=userdebug"
+deviceinfo_generate_bootimg="true"
+deviceinfo_bootimg_qcdt="true"
+deviceinfo_flash_offset_base="0x10000000"
+deviceinfo_flash_offset_kernel="0x00008000"
+deviceinfo_flash_offset_ramdisk="0x01000000"
+deviceinfo_flash_offset_second="0x00f00000"
+deviceinfo_flash_offset_tags="0x00000100"
+deviceinfo_flash_pagesize="2048"
+deviceinfo_flash_heimdall_partition_kernel="BOOT"
+deviceinfo_flash_heimdall_partition_system="SYSTEM"
+deviceinfo_flash_sparse="true"
+

device/device-samsung-herolte/initfs-hook.sh

@@ -0,0 +1,8 @@
+# Set 16bpp fb mode and ensure size is set
+echo 16 > /sys/class/graphics/fb0/bits_per_pixel
+echo 1440,2560 > /sys/class/graphics/fb0/virtual_size
+
+# Blank and unblank
+echo 1 > /sys/class/graphics/fb0/blank
+echo 0 > /sys/class/graphics/fb0/blank
+

device/linux-samsung-herolte/01-remove-android-defines.patch

@@ -0,0 +1,24 @@
+# This patch removes the __ANDROID__ defines that activate the macros needed for
+# the connection gadget system in the kernel.
+# Needed for very obvious reasons.
+
+diff --git a/drivers/usb/gadget/function/f_conn_gadget.ioctl.h b/drivers/usb/gadget/function/f_conn_gadget.ioctl.h
+index aed3e027..3486e7a3 100644
+--- a/drivers/usb/gadget/function/f_conn_gadget.ioctl.h
++++ b/drivers/usb/gadget/function/f_conn_gadget.ioctl.h
+@@ -25,8 +25,6 @@ enum {
+ 	CONN_GADGET_IOCTL_BIND_STATUS_UNBIND = 2
+ };
+ 
+-#if defined(__ANDROID__)||defined(__TIZEN__)
+-
+ enum { 
+ 	CONN_GADGET_IOCTL_NR_0 = 0,
+ 	CONN_GADGET_IOCTL_NR_1,
+@@ -42,6 +40,5 @@ enum {
+ #define CONN_GADGET_IOCTL_BIND_WAIT_NOTIFY	_IOR(CONN_GADGET_IOCTL_MAGIC_SIG, CONN_GADGET_IOCTL_NR_1, int)
+ #define CONN_GADGET_IOCTL_BIND_GET_STATUS	_IOR(CONN_GADGET_IOCTL_MAGIC_SIG, CONN_GADGET_IOCTL_NR_2, int)
+ #define CONN_GADGET_IOCTL_MAX_NR			CONN_GADGET_IOCTL_NR_MAX
+-#endif
+ 
+ #endif

device/linux-samsung-herolte/02-fix-dtbtool.patch

@@ -0,0 +1,31 @@
+Exynos devices have a special device tree image format, which the built in
+script in this kernel source facilitates.
+Unfortunately, the script is badly written in the part where command line
+arguments are parsed, so this fixes it to create a valid dtb.
+
+diff --git a/scripts/dtbtool_exynos/dtbtool.c b/scripts/dtbtool_exynos/dtbtool.c
+index f72fe8662ee..cacd8c69a32 100644
+--- a/scripts/dtbtool_exynos/dtbtool.c
++++ b/scripts/dtbtool_exynos/dtbtool.c
+@@ -378,13 +378,14 @@ int main(int argc, char **argv)
+ 			dt_subtype_code = strtoul(val, 0, 16);
+ 		} else if (*arg != '-') {
+ 			/* skip over already allocated file names */
+-			for (; dtb_files[dt_count]; dt_count++)
+-				if (dt_count >= DTB_MAX)
+-					fail("reached dtb file limit (%d)", DTB_MAX);
+-
+-			dtb_files[dt_count] = strdup(arg);
+-			if (!dtb_files[dt_count])
+-				fail("failed to allocate memory");
++			for (; dtb_files[dt_count]; dt_count++) {
++                if (dt_count >= DTB_MAX) {
++                    fail("reached dtb file limit (%d)", DTB_MAX);
++                } else {
++                    dtb_files[dt_count] = strdup(arg);
++                    if (!dtb_files[dt_count]) fail("failed to allocate memory");
++                }
++            }
+ 		} else
+ 			usage();
+ 	}

device/linux-samsung-herolte/APKBUILD

@@ -0,0 +1,71 @@
+# Reference: <https://postmarketos.org/vendorkernel>
+# Kernel config based on: arch/arm64/configs/exynos8890-hero2lte_defconfig
+
+pkgname="linux-samsung-herolte"
+pkgver=3.18.133
+pkgrel=0
+pkgdesc="Samsung Galaxy S7 kernel fork"
+arch="aarch64"
+_carch="arm64"
+_flavor="samsung-herolte"
+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 dtbtool"
+
+# Compiler: latest GCC from Alpine
+HOSTCC="${CC:-gcc}"
+HOSTCC="${HOSTCC#${CROSS_COMPILE}}"
+
+# Source - use Ivan Meler's 3.18 upstream kernel
+_repository="android_kernel_samsung_herolte"
+_commit="24b577569468748591f7be6435af67e17b532886"
+_config="config-${_flavor}.${arch}"
+source="
+	$pkgname-$_commit.tar.gz::https://github.com/ivanmeler/${_repository}/archive/${_commit}.tar.gz
+	$_config
+	01-remove-android-defines.patch
+	02-fix-dtbtool.patch
+"
+builddir="$srcdir/${_repository}-${_commit}"
+
+prepare() {
+	default_prepare
+	downstreamkernel_prepare "$srcdir" "$builddir" "$_config" "$_carch" "$HOSTCC"
+}
+
+build() {
+	unset LDFLAGS
+	make ARCH="$_carch" CC="${CC:-gcc}" \
+		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
+	# Note: the DTB for this kernel is built in tree, we just need to copy it.
+}
+
+package() {
+	# kernel.release
+	install -D "$builddir/include/config/kernel.release" \
+		"$pkgdir/usr/share/kernel/$_flavor/kernel.release"
+
+	# zImage (find the right one)
+	cd "$builddir/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 $PWD!"
+		return 1
+	fi
+
+	# Copy the in-tree DTBH block image
+	install -Dm644 "$builddir/arch/arm64/boot/dtb.img" \
+		"$pkgdir/boot/dt.img"
+}
+
+sha512sums="59c128754698259ad7f759def8a82b3f0756404bfe8b474df375c6af0a45b9875ba9a00acca5605b8dcebff4fa5ca1cd20d84d3f398999fe38c3f5837690848c  linux-samsung-herolte-24b577569468748591f7be6435af67e17b532886.tar.gz
+ee0057fa8996ca62fbb93f76e9220ee6a17aa28abe1280eb215a483a5b31dfec8b69d49eb1f012952d96ec5cd2cb3ce6475ad98f91ea019f66f4e465906b8ea2  config-samsung-herolte.aarch64
+66e27a174e12d56f5b77932985f0001b551c834d68b2a1bcc1d0b7d04e555757fc9137c182bd4cf5ffd57bf2cb0918d758dfe153a6140b77f02e7b9f33ecfb2c  01-remove-android-defines.patch
+59b7151edece9fec879c12fe53fa4a7d34563c9b7ed45fa5e96036bde7616cac0976adeef54a5f36d883d51747831881b2586ac02ac47db4123c399cf98e93d8  02-fix-dtbtool.patch"