fatal: Finish StopSoundTask

stratosphere/fatal/source/fatal_task_sound.cpp

@@ -20,6 +20,7 @@
 
 void StopSoundTask::StopSound() {
     /* Talk to the ALC5639 over I2C, and disable audio output. */
+    {
         I2cSession audio;
         if (R_SUCCEEDED(i2cOpenSession(&audio, I2cDevice_AudioCodec))) {
             struct {
@@ -48,8 +49,22 @@ void StopSoundTask::StopSound() {
             
             i2csessionClose(&audio);
         }
+    }
     
-    /* TODO: Talk to the ALC5639 over GPIO */
+    /* Talk to the ALC5639 over GPIO, and disable audio output */
+    {
+        GpioPadSession audio;
+        if (R_SUCCEEDED(gpioOpenSession(&audio, GpioPadName_AudioCodec))) {
+            /* Set direction output, sleep 200 ms so it can take effect. */
+            gpioPadSetDirection(&audio, GpioDirection_Output);
+            svcSleepThread(200000000UL);
+            
+            /* Pull audio codec low. */
+            gpioPadSetValue(&audio, GpioValue_Low);
+            
+            gpioPadClose(&audio);
+        }
+    }
 }
 
 Result StopSoundTask::Run() {