Add fix command and troubleshooting for errno=16 error

- Add 'fix' command to diagnose CEC connection issues
- Add detailed troubleshooting section for common errors
- Fix handles errno=16 (device busy) by checking processes and trying sudo
- Document solutions for CEC permission and connection issues

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

cec-control.sh

@@ -41,6 +41,7 @@ Commands:
   scan                     Scan for CEC devices
   status                   Show CEC adapter status
   info                     Show TV information
+  fix                      Troubleshoot connection issues
 
   raw <command>            Send raw CEC command (hex)
 
@@ -136,6 +137,46 @@ raw_command() {
     send_command "tx $cmd"
 }
 
+fix_connection() {
+    echo "Attempting to fix CEC connection issues..."
+    echo ""
+
+    # Check if running as root
+    if [ "$EUID" -ne 0 ]; then
+        echo "Checking for existing CEC processes..."
+        pgrep -a cec-client || echo "No cec-client processes found"
+        echo ""
+        echo "Trying with sudo - you may need to enter your password:"
+        echo ""
+        sudo "$0" "$@"
+        exit $?
+    fi
+
+    echo "Running as root - checking CEC device status..."
+    echo ""
+
+    # Check if device exists
+    if [ -e /dev/cec0 ]; then
+        echo "CEC device /dev/cec0 exists"
+        ls -l /dev/cec0
+        echo ""
+
+        # Check what's using the device
+        echo "Checking what's using the CEC device:"
+        lsof /dev/cec0 2>/dev/null || echo "Nothing is locking /dev/cec0"
+        echo ""
+    else
+        echo "Warning: /dev/cec0 does not exist"
+        echo "Available devices:"
+        ls -la /dev/cec* /dev/tty* 2>/dev/null | grep -E "cec|ttyAMA|ttyS0" || echo "No CEC devices found"
+        echo ""
+    fi
+
+    echo "Attempting to scan for devices..."
+    echo ""
+    $CEC_CLIENT -s -d 1 < /dev/null
+}
+
 # Main script logic
 case "$1" in
     tv-on)
@@ -174,6 +215,9 @@ case "$1" in
     info)
         show_info
         ;;
+    fix)
+        fix_connection
+        ;;
     raw)
         raw_command "$2"
         ;;