service: hid: Implement GetLastActiveNpad

src/core/hle/service/hid/hid_system_server.cpp

@@ -275,11 +275,14 @@ void IHidSystemServer::DisableAssigningSingleOnSlSrPress(HLERequestContext& ctx)
 }
 
 void IHidSystemServer::GetLastActiveNpad(HLERequestContext& ctx) {
-    LOG_DEBUG(Service_HID, "(STUBBED) called"); // Spams a lot when controller applet is running
+    Core::HID::NpadIdType npad_id{};
+    const Result result = GetResourceManager()->GetNpad()->GetLastActiveNpad(npad_id);
+
+    LOG_DEBUG(Service_HID, "called, npad_id={}", npad_id);
 
     IPC::ResponseBuilder rb{ctx, 3};
-    rb.Push(ResultSuccess);
-    rb.Push(0); // Dont forget to fix this
+    rb.Push(result);
+    rb.PushEnum(npad_id);
 }
 
 void IHidSystemServer::ApplyNpadSystemCommonPolicyFull(HLERequestContext& ctx) {

src/hid_core/resources/npad/npad.cpp

@@ -1378,4 +1378,10 @@ Result NPad::AssigningSingleOnSlSrPress(u64 aruid, bool is_enabled) {
     return result;
 }
 
+Result NPad::GetLastActiveNpad(Core::HID::NpadIdType& out_npad_id) const {
+    std::scoped_lock lock{mutex};
+    out_npad_id = hid_core.GetLastActiveController();
+    return ResultSuccess;
+}
+
 } // namespace Service::HID

src/hid_core/resources/npad/npad.h

@@ -159,6 +159,8 @@ public:
 
     Result AssigningSingleOnSlSrPress(u64 aruid, bool is_enabled);
 
+    Result GetLastActiveNpad(Core::HID::NpadIdType& out_npad_id) const;
+
 private:
     struct VibrationData {
         bool device_mounted{};