setup-audio

#!/bin/bash
#

set -e

echo "Installing Audio..."

# Configuration
# You can adapt these to support other KBL/SKL devices

# Apollo Lake / coral:
# SND_CARD=bxtda7219max
# SND_BOARD=.coral
# SND_MODULE=snd_soc_sst_bxt_da7219_max98357a

[[ -n "$SND_CARD"   ]] || { export SND_CARD=kblda7219max; }
[[ -n "$SND_BOARD"  ]] || { export SND_BOARD=.nami; }
[[ -n "$SND_MODULE" ]] || { export SND_MODULE=snd_soc_kbl_da7219_max98357a; }

export SND_DEVICE=${SND_CARD}${SND_BOARD}

# Remove PulseAudio
sudo apt purge pulseaudio
sudo apt purge pulseaudio*

# On newer GNOME installs, Pipewire is a dependency of GNOME.
# We can't remove it, but we can mask (completely disable) the systemd service
{
    systemctl --user mask pipewire.socket
    systemctl --user mask pipewire.service
    systemctl --user mask pulseaudio.socket
    systemctl --user mask pulseaudio.service
} || echo "Please install a desktop and rerun this script if audio doesn't work."

# Copy the firmware and create the correct UCM Files
sudo umount /mnt || true
sudo mount -t ext2 -o ro /dev/mmcblk0p3 /mnt || sudo mount -t ext2 -o ro /dev/mmcblk1p3 /mnt
sudo cp -rv /mnt/lib/firmware/* /lib/firmware
sudo rm -rf /usr/share/alsa/ucm2/${SND_CARD} || true
sudo cp -rv /mnt/usr/share/alsa/ucm*/${SND_DEVICE} /usr/share/alsa/ucm2/${SND_CARD}
sudo umount /mnt
sudo mv /usr/share/alsa/ucm2/${SND_CARD}/${SND_DEVICE}.conf /usr/share/alsa/ucm2/${SND_CARD}/${SND_CARD}.conf
sudo sed -i '1s/^/Syntax 2\n/' /usr/share/alsa/ucm2/${SND_CARD}/${SND_CARD}.conf
sudo sed -i '/Pin/{/Mux/ d}' /usr/share/alsa/ucm2/${SND_CARD}/HiFi.conf
# Check if user has the newer UCM directory layout
ls /usr/share/alsa/ucm2/conf.d && {
    sudo mv /usr/share/alsa/ucm2/${SND_CARD} /usr/share/alsa/ucm2/conf.d
}
sudo apt install alsa-base alsa-utils apulse

# Enable Dmix (multiple app audio output) and software master volume control
sudo tee /etc/asound.conf <<EOF
pcm.!default {
    type plug
    slave.pcm "softvol"
}

pcm.softvol {
    type softvol # Software volume control
    slave {
        pcm "dmix"
    }
    control {
        name "Master"
        card 0
    }
}
EOF

# Add a systemd service to start sound
sudo tee /etc/systemd/system/alsa-reload.service <<EOF
[Unit]
Description="Reload ALSA and set the correct UCM"

[Service]
User=root
WorkingDirectory=/
ExecStart=/bin/bash -c 'modprobe ${SND_MODULE} && alsa reload && sleep 2 && alsaucm -c ${SND_CARD} set _verb HiFi set _enadev Speaker'

[Install]
WantedBy=multi-user.target
EOF

# Refresh systemd
sudo systemctl daemon-reload

# Replace PulseAudio libraries with Apulse, which makes PulseAudio apps work with ALSA
for lib in libpulse-mainloop-glib.so libpulse-simple.so libpulse.so; do

    set +e
	sudo rm -f /usr/lib/${lib} /usr/lib/${lib}.0 /usr/lib/x86_64-linux-gnu/${lib} /usr/lib/x86_64-linux-gnu/${lib}.0
    set -e
	
	sudo ln -s /usr/lib/x86_64-linux-gnu/apulse/${lib}   "/usr/lib/${lib}"
	sudo ln -s /usr/lib/x86_64-linux-gnu/apulse/${lib}.0 "/usr/lib/${lib}.0"
	sudo ln -s /usr/lib/x86_64-linux-gnu/apulse/${lib}   "/usr/lib/x86_64-linux-gnu/${lib}"
	sudo ln -s /usr/lib/x86_64-linux-gnu/apulse/${lib}.0 "/usr/lib/x86_64-linux-gnu/${lib}.0"
	
done

sudo systemctl enable alsa-reload

sync
echo 'Done! Reboot to enable audio'