AM/ICommonStateGetter: Stub SetLcdBacklighOffEnabled (#3454)

* Stub SetLcdBacklighOffEnabled

Used by Super Smash Bros. Ultimate
We require backlight services to be implemented to turn on/off the backlight.

* Address feedback

src/core/hle/service/am/am.cpp

@@ -607,7 +607,7 @@ ICommonStateGetter::ICommonStateGetter(Core::System& system,
         {40, nullptr, "GetCradleFwVersion"},
         {50, nullptr, "IsVrModeEnabled"},
         {51, nullptr, "SetVrModeEnabled"},
-        {52, nullptr, "SwitchLcdBacklight"},
+        {52, &ICommonStateGetter::SetLcdBacklighOffEnabled, "SetLcdBacklighOffEnabled"},
         {53, nullptr, "BeginVrModeEx"},
         {54, nullptr, "EndVrModeEx"},
         {55, nullptr, "IsInControllerFirmwareUpdateSection"},
@@ -636,7 +636,6 @@ void ICommonStateGetter::GetBootMode(Kernel::HLERequestContext& ctx) {
 
     IPC::ResponseBuilder rb{ctx, 3};
     rb.Push(RESULT_SUCCESS);
-
     rb.Push<u8>(static_cast<u8>(Service::PM::SystemBootMode::Normal)); // Normal boot mode
 }
 
@@ -660,6 +659,7 @@ void ICommonStateGetter::ReceiveMessage(Kernel::HLERequestContext& ctx) {
         rb.PushEnum<AppletMessageQueue::AppletMessage>(message);
         return;
     }
+
     rb.Push(RESULT_SUCCESS);
     rb.PushEnum<AppletMessageQueue::AppletMessage>(message);
 }
@@ -672,6 +672,17 @@ void ICommonStateGetter::GetCurrentFocusState(Kernel::HLERequestContext& ctx) {
     rb.Push(static_cast<u8>(FocusState::InFocus));
 }
 
+void ICommonStateGetter::SetLcdBacklighOffEnabled(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    const auto is_lcd_backlight_off_enabled = rp.Pop<bool>();
+
+    LOG_WARNING(Service_AM, "(STUBBED) called. is_lcd_backlight_off_enabled={}",
+                is_lcd_backlight_off_enabled);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+}
+
 void ICommonStateGetter::GetDefaultDisplayResolutionChangeEvent(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_AM, "called");
 

src/core/hle/service/am/am.h

@@ -182,6 +182,7 @@ private:
     void GetOperationMode(Kernel::HLERequestContext& ctx);
     void GetPerformanceMode(Kernel::HLERequestContext& ctx);
     void GetBootMode(Kernel::HLERequestContext& ctx);
+    void SetLcdBacklighOffEnabled(Kernel::HLERequestContext& ctx);
     void GetDefaultDisplayResolution(Kernel::HLERequestContext& ctx);
     void SetCpuBoostMode(Kernel::HLERequestContext& ctx);