samsung-a6lte: cellular support via samsungipcd (MR 3585)

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

device/testing/device-samsung-a6lte/APKBUILD

@@ -1,8 +1,8 @@
 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-samsung-a6lte
 pkgdesc="Samsung Galaxy A6 2018"
-pkgver=0.1
+pkgver=0.2
-pkgrel=1
+pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
 arch="aarch64"
@@ -15,6 +15,9 @@ depends="
 	pipewire
 	pipewire-pulse
 	postmarketos-base
+	samsungipcd
+	samsungipcd-openrc
+	util-linux
 "
 replaces="
 	lightdm
@@ -22,13 +25,17 @@ replaces="
 	udev-init-scripts-openrc
 "
 makedepends="devicepkg-dev"
+install="$pkgname.post-install"
 source="
 	deviceinfo
+	etc-conf.d-samsungipcd
 	etc-init.d-udev-settle
 	etc-lightdm-lightdm.conf
 	etc-NetworkManager-conf.d-swlan0-unmanaged.conf
+	usr-libexec-samsungipcd-voicecall.sh
 	usr-share-alsa-ucm2-conf.d-Universal7870-I-HiFi.conf
 	usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf
+	usr-share-alsa-ucm2-conf.d-Universal7870-I-VoiceCall.conf
 	usr-share-pipewire-media-session.d-alsa-monitor.conf
 "
 subpackages="$pkgname-nonfree-firmware:nonfree_firmware"
@@ -41,11 +48,14 @@ build() {
 
 package() {
 	devicepkg_package $startdir $pkgname
+	install -Dm644 etc-conf.d-samsungipcd "$pkgdir"/etc/conf.d/samsungipcd
 	install -Dm755 etc-init.d-udev-settle "$pkgdir"/etc/init.d/udev-settle
 	install -Dm644 etc-lightdm-lightdm.conf "$pkgdir"/etc/lightdm/lightdm.conf
 	install -Dm644 etc-NetworkManager-conf.d-swlan0-unmanaged.conf "$pkgdir"/etc/NetworkManager/conf.d/swlan0-unmanaged.conf
+	install -Dm755 usr-libexec-samsungipcd-voicecall.sh "$pkgdir"/usr/libexec/samsungipcd/voicecall.sh
 	install -Dm644 usr-share-alsa-ucm2-conf.d-Universal7870-I-HiFi.conf "$pkgdir"/usr/share/alsa/ucm2/conf.d/Universal7870-I/HiFi.conf
 	install -Dm644 usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf "$pkgdir"/usr/share/alsa/ucm2/conf.d/Universal7870-I/Universal7870-I.conf
+	install -Dm644 usr-share-alsa-ucm2-conf.d-Universal7870-I-VoiceCall.conf "$pkgdir"/usr/share/alsa/ucm2/conf.d/Universal7870-I/VoiceCall.conf
 	install -Dm644 usr-share-pipewire-media-session.d-alsa-monitor.conf "$pkgdir"/usr/share/pipewire/media-session.d/alsa-monitor.conf
 }
 
@@ -57,10 +67,13 @@ nonfree_firmware() {
 
 sha512sums="
 63be7d1b44093c2d892a92ad788a9a6a9d510c9ca0aac1f249213458402c546560827aaaa23c88497efee4675b15bf47481e551e5de043abaf5ae65e3de9c10a  deviceinfo
+3e5bb764529010d2b6b1f2759a7799f665d140aebcee2dd63433e68cd4282e09b5d3b34fb7c21e737595b406501e7f02ece4592651c60e4c2b9419de4aedb438  etc-conf.d-samsungipcd
 203b832a7080d5f1351c5e024e444f9fe509f6e0fd4b376a60c7d73359b7e356863a4f15caf9b2e4e733dc44d2971722083e7c69ca94a012eb004b4b8ded9d09  etc-init.d-udev-settle
 861270c6bc0b2a3e6cd389c21c8c895e62de8cf8bec6fcf23c178f8cbaae855d62b0ee98692671ab4f518d84cb43dd0b2fe46f5a609f65af6a6c06e0fdbb6d0c  etc-lightdm-lightdm.conf
 ef24527b13e48a9153643f3713167d3d08486e7de8b4c94d7c446ff380396115890573d8cd4aa5448766d9e779e189833a83e7921081679bd348c3f8a59410af  etc-NetworkManager-conf.d-swlan0-unmanaged.conf
-80ea4968be09dec3deac4d6c5c58b7848f6ea297f2fe2e09f58dec5ba78c0a39060a7d86410a52414f615a0fef9ae9506e12d492d700eb168793433ea7691155  usr-share-alsa-ucm2-conf.d-Universal7870-I-HiFi.conf
+abe1c4a2f59fe862cebef75c54b8806bd86ce06aeb15d8c0699ab1338c9d575cb72a4d5b099f94272b1d9c9c3f4960af209a9e058ea9e57733b7d905dad0d33f  usr-libexec-samsungipcd-voicecall.sh
-fe527672d5e52a1b074e7e3613a6321f987270ececfdfaf49d1fde9fcd4f4dc93f37374c80ee3d539e4079a5c6e07ffddc648a1544bccbe4810e1bc30d0c2112  usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf
+2169590d10d6123575d43e8ff7dc0d2ba824f8266d9fa75a5b59a4cc5753e47e327368b777082930d6b7a7aed6f57fa6ac2c5a2e816e1e12cd1032a8bb1822b5  usr-share-alsa-ucm2-conf.d-Universal7870-I-HiFi.conf
+dc528deb556906adfb89b02b6faa04a8b21358706bb60e2fa51c8a3c909b680fcc02fa425b0cb5d6273595f27dfc9b640e1a8d455657fd6b47652af9e8ec295a  usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf
+3e74de3504f134a2726ee87740c5803bbd578352674d1d7de8b9460e57553100e9c4d322143ee83d3d584884c52eef47762bed41814ff1fca8cd9c4552f39b73  usr-share-alsa-ucm2-conf.d-Universal7870-I-VoiceCall.conf
 5e87452f4cd70bbbcfb3e69bae73f2690ba328e7ccde55c47482e8fb1583d807de5bd3d328b1fe6a8733b4de78b2ed0c6ae8cdb60f6bf51ed4362c2174671b3e  usr-share-pipewire-media-session.d-alsa-monitor.conf
 "

device/testing/device-samsung-a6lte/device-samsung-a6lte.post-install

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+# Create mount point and /efs mount point in fstab
+if ! grep -q /efs /etc/fstab; then
+	mkdir -p /efs
+	echo "/dev/disk/by-partlabel/EFS	/efs	auto	ro	0	0" >> /etc/fstab
+fi

device/testing/device-samsung-a6lte/etc-conf.d-samsungipcd

@@ -0,0 +1 @@
+IPC_DEVICE_NAME="herolte"

device/testing/device-samsung-a6lte/usr-libexec-samsungipcd-voicecall.sh

@@ -0,0 +1,61 @@
+#!/bin/sh
+# This script sets up the audio subsystem to route audio to and from the modem.
+# Called by samsungipcd when the call starts. When the call ends, we receive a
+# newline and terminate ourselves.
+# Note: as a side effect, software on the phone cannot access the microphone
+# during a call.
+
+# Put ourselves into a PID namespace. This is an easy and non-racey way to
+# ensure that all child processes get killed on our exit.
+if [ "$$" != 1 ]; then
+	unshare -p sh "$0"
+	exitcode="$?"
+	# Restore MIC1 state to normal. We should be the only entity fiddling
+	# with that.
+	amixer -D sysdefault cset name='MIC1 MIC1 On' 1
+	exit "$exitcode"
+fi
+
+# callaudiod has already changed the UCM verb, no need to do it manually
+#alsaucm set _verb 'Voice Call'
+
+# In order for sound to be forwarded, there must be applictions that are
+# currently playing and recording audio. To ensure that they exists, we
+# connect to each user's PipeWire and start ones.
+
+# Playback
+for i in /run/user/*/; do
+	# To avoid vulnerabilities in PulseAudio becoming LPEs, setuid to the
+	# user running PipeWire.
+	XDG_RUNTIME_DIR="$i" su -c 'aplay /dev/zero' "$(grep "^[^:]*:[^:]*:$(basename "$i"):" /etc/passwd | cut -d : -f 1-1)" &
+done
+
+# Same for recording
+for i in /run/user/*/; do
+	XDG_RUNTIME_DIR="$i" su -c 'arecord /dev/null' "$(grep "^[^:]*:[^:]*:$(basename "$i"):" /etc/passwd | cut -d : -f 1-1)" &
+done
+
+# Microphone switching logic
+for i in /run/user/*/; do
+	XDG_RUNTIME_DIR="$i" su -c '
+		# Set locale to C to avoid parsing localized command output
+		export LANG=C
+		# Report microphone mute events
+		( echo; pactl subscribe; ) | while read; do pactl get-source-mute @DEFAULT_SOURCE@; done
+	' "$(grep "^[^:]*:[^:]*:$(basename "$i"):" /etc/passwd | cut -d : -f 1-1)" &
+done | while read line; do
+	if [[ "$line" == "Mute: yes" ]]; then
+		amixer -D sysdefault cset name='MIC1 MIC1 On' 0
+	elif [[ "$line" == "Mute: no" ]]; then
+		amixer -D sysdefault cset name='MIC1 MIC1 On' 1
+	fi
+done &
+
+# Wait for newline from samsungipcd. This means that the call has ended.
+read
+
+# No need to clean up, closing the PID namespace will kill all children
+#jobs -p | xargs kill
+
+# Again, callaudiod will switch UCM verbs for us
+#alsaucm set _verb 'HiFi'

device/testing/device-samsung-a6lte/usr-share-alsa-ucm2-conf.d-Universal7870-I-HiFi.conf

@@ -3,24 +3,32 @@ SectionVerb {
 	]
 }
 
-SectionDevice."Headphones" {
+SectionDevice."Speaker" {
+	Comment "Internal speaker"
+
 	EnableSequence [
+		cset 'name="AMP Enable Switch" 1'
 	]
 
 	DisableSequence [
+		cset 'name="AMP Enable Switch" 0'
 	]
 
 	Value {
-		PlaybackPriority 100
+		PlaybackPriority 101
 		PlaybackPCM "hw:${CardId}"
 	}
 }
 
 SectionDevice."Mic" {
+	Comment "Internal microphone"
+
 	EnableSequence [
+		cset 'name="MIC1 MIC1 On" 1'
 	]
 
 	DisableSequence [
+		cset 'name="MIC1 MIC1 On" 0'
 	]
 
 	Value {
@@ -28,3 +36,24 @@ SectionDevice."Mic" {
 		CapturePCM "hw:${CardId}"
 	}
 }
+
+SectionDevice."Earpiece" {
+	Comment "Earpiece"
+
+	EnableSequence [
+		cset 'name="EP EP On" 1'
+		cset 'name="EP Mixer DACL Switch" 1'
+		cset 'name="EP Mixer DACR Switch" 1'
+	]
+
+	DisableSequence [
+		cset 'name="EP Mixer DACR Switch" 0'
+		cset 'name="EP Mixer DACL Switch" 0'
+		cset 'name="EP EP On" 0'
+	]
+
+	Value {
+		PlaybackPriority 100
+		PlaybackPCM "hw:${CardId}"
+	}
+}

device/testing/device-samsung-a6lte/usr-share-alsa-ucm2-conf.d-Universal7870-I-Universal7870-I.conf

@@ -1,9 +1,15 @@
 Syntax 2
 
 SectionUseCase."HiFi" {
+	Comment "Hi-Fi"
 	File "HiFi.conf"
 }
 
+SectionUseCase."Voice Call" {
+	Comment "Voice Call"
+	File "VoiceCall.conf"
+}
+
 SectionDefaults [
 	cset "name='AudioMixer Mixer En' 1"
 	cset "name='AudioMixer CH1 Mixer En' 1"

device/testing/device-samsung-a6lte/usr-share-alsa-ucm2-conf.d-Universal7870-I-VoiceCall.conf

@@ -0,0 +1,81 @@
+SectionVerb {
+	EnableSequence [
+		cset 'name="AudioMixer SRC2 En" 1'
+		cset 'name="AudioMixer CH2 Mixer En" 1'
+		cset 'name="AudioMixer CH1 DOUT Select" 2'
+		cset 'name="AudioMixer CH2 DOUT Select" 1'
+		cset 'name="AudioMixer CH1 I2S Data Length" 0'
+		cset 'name="AudioMixer CH1 XFS" 1'
+		cset 'name="AudioMixer CH2 I2S Data Length" 0'
+		cset 'name="AudioMixer CH2 XFS" 0'
+		cset 'name="AMP Enable Switch" 0'
+		cset 'name="EP EP On" 1'
+		cset 'name="EP Mixer DACL Switch" 1'
+		cset 'name="EP Mixer DACR Switch" 1'
+	]
+	DisableSequence [
+		cset 'name="EP Mixer DACR Switch" 0'
+		cset 'name="EP Mixer DACL Switch" 0'
+		cset 'name="EP EP On" 0'
+		cset 'name="AMP Enable Switch" 1'
+		cset 'name="AudioMixer CH2 DOUT Select" 0'
+		cset 'name="AudioMixer CH1 DOUT Select" 1'
+		cset 'name="AudioMixer CH2 Mixer En" 0'
+		cset 'name="AudioMixer SRC2 En" 0'
+	]
+}
+
+SectionDevice."Speaker" {
+	Comment "Internal speaker"
+
+	EnableSequence [
+		cset 'name="AMP Enable Switch" 1'
+	]
+
+	DisableSequence [
+		cset 'name="AMP Enable Switch" 0'
+	]
+
+	Value {
+		PlaybackPriority 100
+		PlaybackPCM "hw:${CardId}"
+	}
+}
+
+SectionDevice."Mic" {
+	Comment "Internal microphone"
+
+	EnableSequence [
+		cset "name='MIC1 MIC1 On' 1"
+	]
+
+	DisableSequence [
+		cset "name='MIC1 MIC1 On' 0"
+	]
+
+	Value {
+		CapturePriority 100
+		CapturePCM "hw:${CardId}"
+	}
+}
+
+SectionDevice."Earpiece" {
+	Comment "Earpiece"
+
+	EnableSequence [
+		cset 'name="EP EP On" 1'
+		cset 'name="EP Mixer DACL Switch" 1'
+		cset 'name="EP Mixer DACR Switch" 1'
+	]
+
+	DisableSequence [
+		cset 'name="EP Mixer DACR Switch" 0'
+		cset 'name="EP Mixer DACL Switch" 0'
+		cset 'name="EP EP On" 0'
+	]
+
+	Value {
+		PlaybackPriority 101
+		PlaybackPCM "hw:${CardId}"
+	}
+}