fix issue #24

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

FunKey/board/funkey/rootfs-overlay/usr/local/sbin/audio_amp

@@ -28,12 +28,12 @@ case "${1}" in
 	else
     	    exit 0
 	fi
-	enable=1
+	new_state=1
 	;;
 
     0|off|OFF|Off)
 	echo "Turning audio amplifier OFF"
-	enable=0
+	new_state=0
 	;;
 
     *)
@@ -46,7 +46,14 @@ if [ ! -d "${SYSTEM_GPIO}/gpio${GPIO_PF6}" ]; then
     echo ${GPIO_PF6} > "${SYSTEM_GPIO}/export"
 fi
 
-# Enable/disable the pwoer audio amplifier
+# Set the power audio amplifier GPIO as output
 echo "out" > "${SYSTEM_GPIO}/gpio${GPIO_PF6}/direction"
-echo ${enable} > "${SYSTEM_GPIO}/gpio${GPIO_PF6}/value"
+
+# Read the current power audio amplifier state
+current_state=$(cat "${SYSTEM_GPIO}/gpio${GPIO_PF6}/value")
+
+# Enable/disable the power audio amplifier if necessary
+if [ ${current_state} -ne ${new_state} ]; then
+    echo ${new_state} > "${SYSTEM_GPIO}/gpio${GPIO_PF6}/value"
+fi
 exit 0

FunKey/board/funkey/rootfs-overlay/usr/local/sbin/instant_play

@@ -26,7 +26,6 @@ case ${1} in
 
 	# Launch Previous Game if any
 	if [ -f "${INSTANT_PLAY_FILE}" ]; then
-	    audio_amp on
 	    keymap resume
 	    echo -n "Found Instant Play file, restarting previous game with command: "
 	    echo $(head -n 1 "${INSTANT_PLAY_FILE}")

FunKey/board/funkey/rootfs-overlay/usr/local/sbin/volume

@@ -81,10 +81,10 @@ set_volume() {
     fi
 
     # Turn on/off audio amplifier if necessary
-    if [ ${current_volume} -eq 0 -a ${new_volume} -ne 0 ]; then
+    if [ ${new_volume} -eq 0 ]; then
-	audio_amp on
-    elif [ ${current_volume} -ne 0 -a ${new_volume} -eq 0 ]; then
 	audio_amp off
+    else
+	audio_amp on
     fi
 }