fatal: Implement the first half of StopSoundTask

stratosphere/fatal/source/fatal_main.cpp

@@ -72,6 +72,11 @@ void __appInit(void) {
         std::abort();
     }
     
+    rc = i2cInitialize();
+    if (R_FAILED(rc)) {
+        std::abort();
+    }
+    
     rc = bpcInitialize();
     if (R_FAILED(rc)) {
         std::abort();
@@ -107,6 +112,7 @@ void __appExit(void) {
     lblExit();
     pcvExit();
     bpcExit();
+    i2cExit();
     pminfoExit();
     setsysExit();
     smExit();

stratosphere/fatal/source/fatal_task.cpp

@@ -20,6 +20,7 @@
 
 #include "fatal_task_error_report.hpp"
 #include "fatal_task_screen.hpp"
+#include "fatal_task_sound.hpp"
 #include "fatal_task_clock.hpp"
 #include "fatal_task_power.hpp"
 
@@ -56,7 +57,7 @@ void RunFatalTasks(FatalContext *ctx, u64 title_id, bool error_report, Event *er
     RunTask(new ErrorReportTask(ctx, title_id, error_report, erpt_event));
     RunTask(new PowerControlTask(ctx, title_id, erpt_event, battery_event));
     /* TODO: RunTask(new ShowFatalTask(ctx, title_id, battery_event)); */
-    /* TODO: RunTask(new StopSoundTask(ctx, title_id)); */
+    RunTask(new StopSoundTask(ctx, title_id));
     RunTask(new BacklightControlTask(ctx, title_id));
     RunTask(new AdjustClockTask(ctx, title_id));
     RunTask(new PowerButtonObserveTask(ctx, title_id, erpt_event));

stratosphere/fatal/source/fatal_task_sound.cpp

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2018 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+#include <switch.h>
+#include "fatal_task_sound.hpp"
+
+
+void StopSoundTask::StopSound() {
+    /* Talk to the ALC5639 over I2C, and disable audio output. */
+    I2cSession audio;
+    if (R_SUCCEEDED(i2cOpenSession(&audio, I2cDevice_AudioCodec))) {
+        struct {
+            u16 dev;
+            u8 val;
+        } __attribute__((packed)) cmd;
+        static_assert(sizeof(cmd) == 3, "I2C command definition!");
+
+        cmd.dev = 0xC801;
+        cmd.val = 200;
+        i2csessionSendAuto(&audio, &cmd, sizeof(cmd), I2cTransactionOption_All);
+
+        cmd.dev = 0xC802;
+        cmd.val = 200;
+        i2csessionSendAuto(&audio, &cmd, sizeof(cmd), I2cTransactionOption_All);
+
+        cmd.dev = 0xC802;
+        cmd.val = 200;
+        i2csessionSendAuto(&audio, &cmd, sizeof(cmd), I2cTransactionOption_All);
+        
+        for (u16 dev = 97; dev <= 102; dev++) {
+            cmd.dev = dev;
+            cmd.val = 0;
+            i2csessionSendAuto(&audio, &cmd, sizeof(cmd), I2cTransactionOption_All);
+        }
+        
+        i2csessionClose(&audio);
+    }
+    
+    /* TODO: Talk to the ALC5639 over GPIO */
+}
+
+Result StopSoundTask::Run() {
+    StopSound();
+    return 0;
+}

stratosphere/fatal/source/fatal_task_sound.hpp

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2018 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+ 
+#pragma once
+#include <switch.h>
+#include <stratosphere.hpp>
+#include "fatal_task.hpp"
+
+class StopSoundTask : public IFatalTask {
+    private:
+        void StopSound();
+    public:
+        StopSoundTask(FatalContext *ctx, u64 title_id) : IFatalTask(ctx, title_id) { }
+        virtual Result Run() override;
+        virtual const char *GetName() const override {
+            return "SoundTask";
+        }
+};