How can my MIDI driver seize control of my USB device from AppleMIDIUSBDriver.plugin?

App & System Services Drivers
ykaizu OP
Created Feb ’20
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I am developing my own MIDI driver for macOS based on SampleUSBMIDIDriver.


When I open the Audio MIDI Setup and then connect my USB MIDI device to my Mac, my MIDI driver loads properly.


However, when I connect my USB MIDI device to my Mac and then open Audio MIDI Setup, my MIDI driver fails at IOUSBDeviceInterface::USBDeviceOpen().


This is because AppleMIDIUSBDriver.plugin has already opened the device.


Can my MIDI driver seize control of my USB device from AppleMIDIUSBDriver.plugin?


Thank you.

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How can my MIDI driver seize control of my USB device from AppleMIDIUSBDriver.plugin?
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