#!/bin/bash
# Reinitialize the TLV320DAC3100 codec without a full reboot.
# Tears down the ALSA driver, resets the codec via i2c, then re-binds
# the driver so ALSA comes back fresh.
#
# Usage: sudo ./reinit-codec.sh

set -euo pipefail

BUS=1
ADDR=0x18
DRIVER_PATH="/sys/bus/i2c/drivers/tlv320aic31xx-codec"
DEVICE="1-0018"

w() { i2cset -y $BUS $ADDR "$@"; }

echo "=== Reinitializing TLV320DAC3100 ==="

# 1. Stop anything using the sound card
echo "[1/5] Stopping audio consumers..."
if command -v pulseaudio &>/dev/null; then
    pulseaudio --kill 2>/dev/null || true
fi
if command -v pipewire &>/dev/null; then
    systemctl --user stop pipewire pipewire-pulse 2>/dev/null || true
fi
fuser -k /dev/snd/* 2>/dev/null || true
sleep 0.2

# 2. Unbind the kernel driver so it releases the codec
echo "[2/5] Unbinding kernel driver..."
if [ -e "$DRIVER_PATH/$DEVICE" ]; then
    echo "$DEVICE" > "$DRIVER_PATH/unbind"
    sleep 0.3
    echo "      Driver unbound."
else
    echo "      Device not bound, skipping."
fi

# 3. Software-reset the codec over i2c
echo "[3/5] Resetting codec via i2c..."
# Select page 0
w 0x00 0x00
# Software reset
w 0x01 0x01
sleep 0.5
echo "      Codec reset."

# 4. Re-bind the kernel driver (it will re-probe and init the codec)
echo "[4/5] Re-binding kernel driver..."
echo "$DEVICE" > "$DRIVER_PATH/bind"
sleep 1
echo "      Driver bound."

# 5. Restore mixer defaults
echo "[5/5] Restoring mixer settings..."
sleep 0.5

# Unmute and set sensible defaults via amixer
amixer -c0 sset 'DAC'            127 127  2>/dev/null || true
amixer -c0 sset 'Speaker Driver' 0        2>/dev/null || true
amixer -c0 sset 'Speaker Analog' 100      2>/dev/null || true
amixer -c0 sset 'HP Analog'      100 100  2>/dev/null || true
amixer -c0 sset 'HP Driver'      0   0    2>/dev/null || true

# Restart audio daemons if they were running
if command -v pipewire &>/dev/null; then
    systemctl --user start pipewire pipewire-pulse 2>/dev/null || true
fi

echo ""
echo "=== Codec reinitialized ==="
aplay -l 2>/dev/null | grep -A1 "barepiaudio" || echo "(warning: card not visible yet)"