From 8845fbdb7e84f4707e7b664b01e381419d7deadb Mon Sep 17 00:00:00 2001
From: Jordan Woyak <jordan.woyak@gmail.com>
Date: Fri, 3 Oct 2025 23:08:05 -0500
Subject: [PATCH] WiimoteReal: Detect already connected Wii remotes on Windows
 without having to use the Refresh button.

---
 Source/Core/Core/HW/WiimoteReal/IOWin.cpp     | 14 ++++++++----
 Source/Core/Core/HW/WiimoteReal/IOWin.h       |  1 +
 .../Core/Core/HW/WiimoteReal/WiimoteReal.cpp  | 22 +++++++++++--------
 Source/Core/Core/HW/WiimoteReal/WiimoteReal.h |  4 ++++
 4 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/Source/Core/Core/HW/WiimoteReal/IOWin.cpp b/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
index 1f2e76b1616..6f037019e72 100644
--- a/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/IOWin.cpp
@@ -675,13 +675,19 @@ void WiimoteScannerWindows::FindWiimoteHIDDevices(std::vector<Wiimote*>& found_w
   }
 }
 
-void WiimoteScannerWindows::FindWiimotes(std::vector<Wiimote*>& found_wiimotes,
-                                         Wiimote*& found_board)
+void WiimoteScannerWindows::FindWiimotes(std::vector<Wiimote*>&, Wiimote*&)
 {
+  // Ideally we'd only enumerate the radios once.
   RemoveUnusableWiimoteBluetoothDevices();
   DiscoverAndPairWiimotes(DEFAULT_INQUIRY_LENGTH);
-  // TODO: This sleep is hacky. We should run FindWiimoteHIDDevices when a new device is created.
-  std::this_thread::sleep_for(std::chrono::milliseconds(500));
+
+  // Kinda odd that we never return any remotes here. The scanner interface is odd.
+  // We return all the results in FindAlreadyConnectedWiimote.
+}
+
+void WiimoteScannerWindows::FindAttachedDevices(std::vector<Wiimote*>& found_wiimotes,
+                                                Wiimote*& found_board)
+{
   FindWiimoteHIDDevices(found_wiimotes, found_board);
 }
 
diff --git a/Source/Core/Core/HW/WiimoteReal/IOWin.h b/Source/Core/Core/HW/WiimoteReal/IOWin.h
index 16bdeba0fd3..12c577f950e 100644
--- a/Source/Core/Core/HW/WiimoteReal/IOWin.h
+++ b/Source/Core/Core/HW/WiimoteReal/IOWin.h
@@ -53,6 +53,7 @@ public:
   WiimoteScannerWindows();
   bool IsReady() const override;
   void FindWiimotes(std::vector<Wiimote*>&, Wiimote*&) override;
+  void FindAttachedDevices(std::vector<Wiimote*>&, Wiimote*&) override;
   void Update() override;
   void RequestStopSearching() override {}
 
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
index 36fda0bc8ac..7451c5d02b6 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.cpp
@@ -689,15 +689,12 @@ void WiimoteScanner::ThreadFunc()
       g_controller_interface.PlatformPopulateDevices([] { ProcessWiimotePool(); });
     }
 
-    // Does stuff needed to detect disconnects on Windows
+    // Currently does nothing. To be removed.
     for (const auto& backend : m_backends)
       backend->Update();
 
     CheckForDisconnectedWiimotes();
 
-    if (m_scan_mode.load() == WiimoteScanMode::DO_NOT_SCAN)
-      continue;
-
     // If we don't want Wiimotes in ControllerInterface, we may not need them at all.
     if (!Config::Get(Config::MAIN_CONNECT_WIIMOTES_FOR_CONTROLLER_INTERFACE))
     {
@@ -715,11 +712,22 @@ void WiimoteScanner::ThreadFunc()
         continue;
     }
 
+    // Stop scanning if not in continuous mode.
+    auto scan_mode = WiimoteScanMode::SCAN_ONCE;
+    m_scan_mode.compare_exchange_strong(scan_mode, WiimoteScanMode::DO_NOT_SCAN);
+
     for (const auto& backend : m_backends)
     {
       std::vector<Wiimote*> found_wiimotes;
       Wiimote* found_board = nullptr;
-      backend->FindWiimotes(found_wiimotes, found_board);
+
+      // When not scanning we still look for already attached devices.
+      // This allows Windows and DolphinBar remotes to be quickly discovered.
+      if (scan_mode == WiimoteScanMode::DO_NOT_SCAN)
+        backend->FindAttachedDevices(found_wiimotes, found_board);
+      else
+        backend->FindWiimotes(found_wiimotes, found_board);
+
       {
         std::unique_lock wm_lk(g_wiimotes_mutex);
 
@@ -745,10 +753,6 @@ void WiimoteScanner::ThreadFunc()
         }
       }
     }
-
-    // Stop scanning if not in continuous mode.
-    auto scan_mode = WiimoteScanMode::SCAN_ONCE;
-    m_scan_mode.compare_exchange_strong(scan_mode, WiimoteScanMode::DO_NOT_SCAN);
   }
 
   {
diff --git a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
index 168d9a61001..dd0f699aed9 100644
--- a/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
+++ b/Source/Core/Core/HW/WiimoteReal/WiimoteReal.h
@@ -189,6 +189,10 @@ public:
   virtual void Update() = 0;
   // requests the backend to stop scanning if FindWiimotes is blocking
   virtual void RequestStopSearching() = 0;
+
+  // Used by Windows to search for HID interfaces of already connected Wii remotes.
+  // hidapi should probably implement the equivalent.
+  virtual void FindAttachedDevices(std::vector<Wiimote*>&, Wiimote*&) {}
 };
 
 enum class WiimoteScanMode