From 3aad135e5e08c2fce8344a53e38b259b68934b57 Mon Sep 17 00:00:00 2001
From: Avery Black <avery.c.black@gmail.com>
Date: Sat, 12 Oct 2024 08:54:25 -0700
Subject: [PATCH] Copy gIOMatchCategoryKey into SMBus device stub

---
 VoodooPS2Trackpad/VoodooPS2SynapticsTouchPad.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/VoodooPS2Trackpad/VoodooPS2SynapticsTouchPad.cpp b/VoodooPS2Trackpad/VoodooPS2SynapticsTouchPad.cpp
index f8cdf8e..ee668b8 100644
--- a/VoodooPS2Trackpad/VoodooPS2SynapticsTouchPad.cpp
+++ b/VoodooPS2Trackpad/VoodooPS2SynapticsTouchPad.cpp
@@ -213,6 +213,10 @@ IOService* ApplePS2SynapticsTouchPad::probe(IOService * provider, SInt32 * score
         dictionary->setObject("Clickpad", _cont_caps.one_btn_clickpad ?
                               kOSBooleanTrue : kOSBooleanFalse);
         ApplePS2SmbusDevice *smbus = ApplePS2SmbusDevice::withReset(true, dictionary, 0x2C);
+        
+        // gIOMatchCategoryKey is necessary to prevent multiple services attaching to the PS2 device
+        if (smbus)
+            smbus->setProperty(gIOMatchCategoryKey, getProperty(gIOMatchCategoryKey));
         OSSafeReleaseNULL(dictionary);
         return smbus;
     }