service/am: Implement SetAutoSleepDisabled

Provides a basic implementation of SetAutoSleepDisabled. Until idle
handling is implemented, this is about the best we can do.

In the meantime, provide a rough documenting of specifics that occur
when this function is called on actual hardware.

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

@@ -266,7 +266,7 @@ ISelfController::ISelfController(std::shared_ptr<NVFlinger::NVFlinger> nvflinger
         {65, nullptr, "ReportUserIsActive"},
         {66, nullptr, "GetCurrentIlluminance"},
         {67, nullptr, "IsIlluminanceAvailable"},
-        {68, nullptr, "SetAutoSleepDisabled"},
+        {68, &ISelfController::SetAutoSleepDisabled, "SetAutoSleepDisabled"},
         {69, nullptr, "IsAutoSleepDisabled"},
         {70, nullptr, "ReportMultimediaError"},
         {71, nullptr, "GetCurrentIlluminanceEx"},
@@ -454,6 +454,26 @@ void ISelfController::GetIdleTimeDetectionExtension(Kernel::HLERequestContext& c
     rb.Push<u32>(idle_time_detection_extension);
 }
 
+void ISelfController::SetAutoSleepDisabled(Kernel::HLERequestContext& ctx) {
+    IPC::RequestParser rp{ctx};
+    is_auto_sleep_disabled = rp.Pop<bool>();
+
+    // On the system itself, if the previous state of is_auto_sleep_disabled
+    // differed from the current value passed in, it'd signify the internal
+    // window manager to update (and also increment some statistics like update counts)
+    //
+    // It'd also indicate this change to an idle handling context.
+    //
+    // However, given we're emulating this behavior, most of this can be ignored
+    // and it's sufficient to simply set the member variable for querying via
+    // IsAutoSleepDisabled().
+
+    LOG_DEBUG(Service_AM, "called. is_auto_sleep_disabled={}", is_auto_sleep_disabled);
+
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+}
+
 void ISelfController::GetAccumulatedSuspendedTickValue(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_AM, "called.");
 

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

@@ -133,6 +133,7 @@ private:
     void SetHandlesRequestToDisplay(Kernel::HLERequestContext& ctx);
     void SetIdleTimeDetectionExtension(Kernel::HLERequestContext& ctx);
     void GetIdleTimeDetectionExtension(Kernel::HLERequestContext& ctx);
+    void SetAutoSleepDisabled(Kernel::HLERequestContext& ctx);
     void GetAccumulatedSuspendedTickValue(Kernel::HLERequestContext& ctx);
     void GetAccumulatedSuspendedTickChangedEvent(Kernel::HLERequestContext& ctx);
 
@@ -142,6 +143,7 @@ private:
 
     u32 idle_time_detection_extension = 0;
     u64 num_fatal_sections_entered = 0;
+    bool is_auto_sleep_disabled = false;
 };
 
 class ICommonStateGetter final : public ServiceFramework<ICommonStateGetter> {