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darwin: fix CDCACM device detection on macOS 12+ 

On macOS 12 and later, Apple replaced IOUSBDevice with IOUSBHostDevice
in the USB host stack. When walking the IORegistry parent chain to find
the USB device providing a serial port, the existing code only checked
IOObjectConformsTo(parent, kIOUSBDeviceClassName). On macOS 12+, this
check fails because the USB device node conforms to IOUSBHostDevice
instead.

Fix by also checking IOObjectConformsTo(parent, "IOUSBHostDevice"),
so CDCACM device discovery works on both old and new macOS.

Verified on macOS 26 (Tahoe, arm64) with a ValueCAN 4-2 (V2D805).
pull/86/head
Gowtham Nanjukutty (XC-CP/ECC2.3) 2026-05-22 09:12:58 -04:00
parent 49e578a657
commit 0c9f1c5f3e
1 changed files with 3 additions and 2 deletions
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5
platform/posix/darwin/cdcacmdarwin.cpp
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@ -108,8 +108,9 @@ void CDCACM::Find(std::vector<FoundDevice>& found) {
releasers.emplace_back(parent); releasers.emplace_back(parent);
current = parent; current = parent;
// On old macOSes, IOUSBDevice is the type of the class we want // On old macOSes, IOUSBDevice is the type of the class we want
// On newer macOSes, IOUSBDevice may further be subclassed as IOUSBHostDevice // On macOS 12+, IOUSBHostDevice is the main USB device class (separate hierarchy from IOUSBDevice)
if(IOObjectConformsTo(parent, kIOUSBDeviceClassName)) { if(IOObjectConformsTo(parent, kIOUSBDeviceClassName) ||
IOObjectConformsTo(parent, "IOUSBHostDevice")) {
usb = parent; usb = parent;
break; break;
} }