Re: Mac OS real USB device support issue

[Howard Spoelstra]

On Thu, Apr 8, 2021 at 1:05 PM Gerd Hoffmann <gerd@kraxel.org> wrote:
>
>   Hi,
>
> > > Those might be a good place to start. IOKit provides the drivers and
> > > also the io registry which is probably where you can get if a driver
> > > is bound to a device and which one is it. How to dissociate the
> > > driver from the device though I don't know.
>
> > https://developer.apple.com/library/archive/documentation/DeviceDrivers/Conceptual/IOKitFundamentals/DeviceRemoval/DeviceRemoval.html
>
> > According to this article a driver has a stop() and detach() method
> > that is called by the IOKit to remove a device. I'm thinking QEMU can
> > be the one that calls these methods for a certain device.
>
> libusb should do that.  Interfaces exist already (see
> libusb_detach_kernel_driver & friends) because we have the very same
> problem on linux.
>
> take care,
>   Gerd
>

As far as I understand the patches here
https://github.com/libusb/libusb/issues/906 they are internal to
libusb, so we would need to build a libusb for use with e.g., brew to
build a macOS executable. Or wait for them to be finalised to get
included in libusb and then included in brew and then ....

Best,
Howard