hid: service: Implement Last active Npad

src/core/hid/hid_core.cpp

@@ -154,6 +154,14 @@ NpadIdType HIDCore::GetFirstDisconnectedNpadId() const {
     return NpadIdType::Player1;
 }
 
+void HIDCore::SetLastActiveController(NpadIdType npad_id) {
+    last_active_controller = npad_id;
+}
+
+NpadIdType HIDCore::GetLastActiveController() const {
+    return last_active_controller;
+}
+
 void HIDCore::EnableAllControllerConfiguration() {
     player_1->EnableConfiguration();
     player_2->EnableConfiguration();

src/core/hid/hid_core.h

@@ -48,6 +48,12 @@ public:
     /// Returns the first disconnected npad id
     NpadIdType GetFirstDisconnectedNpadId() const;
 
+    /// Sets the npad id of the last active controller
+    void SetLastActiveController(NpadIdType npad_id);
+
+    /// Returns the npad id of the last controller that pushed a button
+    NpadIdType GetLastActiveController() const;
+
     /// Sets all emulated controllers into configuring mode.
     void EnableAllControllerConfiguration();
 
@@ -77,6 +83,7 @@ private:
     std::unique_ptr<EmulatedConsole> console;
     std::unique_ptr<EmulatedDevices> devices;
     NpadStyleTag supported_style_tag{NpadStyleSet::All};
+    NpadIdType last_active_controller{NpadIdType::Handheld};
 };
 
 } // namespace Core::HID

src/core/hle/service/hid/controllers/npad.cpp

@@ -476,6 +476,10 @@ void Controller_NPad::RequestPadStateUpdate(Core::HID::NpadIdType npad_id) {
         pad_entry.npad_buttons.l.Assign(button_state.zl);
         pad_entry.npad_buttons.r.Assign(button_state.zr);
     }
+
+    if (pad_entry.npad_buttons.raw != Core::HID::NpadButton::None) {
+        hid_core.SetLastActiveController(npad_id);
+    }
 }
 
 void Controller_NPad::OnUpdate(const Core::Timing::CoreTiming& core_timing) {

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

@@ -2768,7 +2768,7 @@ private:
 
         IPC::ResponseBuilder rb{ctx, 3};
         rb.Push(ResultSuccess);
-        rb.PushEnum(Core::HID::NpadIdType::Handheld);
+        rb.PushEnum(system.HIDCore().GetLastActiveController());
     }
 
     void GetUniquePadsFromNpad(HLERequestContext& ctx) {