Re: Mac OS real USB device support issue

[BALATON Zoltan]

On Sat, 10 Apr 2021, Howard Spoelstra wrote:
> On Fri, Apr 9, 2021 at 9:37 PM Programmingkid <programmingkidx@gmail.com> wrote:
> > Have you tried the proposed changes yet for libusb?
>
> Hi,
>
> Yes, I experimented with the current libusb from brew, the latest
> libusb code from github and a patched version based on that. I
> couldn't get a flash drive passed through with any of them. Running as
> root made no difference. My Mojave host doesn't allow unloading the
> kext loaded for the flash drive where Sierra allowed that, but then
> that should be handled by the patches.
>
> I'll link to the latest libusb and the patched version plus the
> patches. I guess it will not work on your host, but you might be able
> to persuade qemu to use them by using
> install_name_tool -change /usr/local/opt/libusb/lib/libusb-1.0.0.dylib
> @executable_path/libusb-1.0.0-latest.dylib qemu-system-ppc
>
> I'll also include the patches, libusb is easily built.
> https://surfdrive.surf.nl/files/index.php/s/Qs0rtTVe2qIudw4/download

I think you (John and Gerd) found that detecting if a kernel driver is 
attached does not seem to work so it does not even get to unloading what 
these patches are about I think. So you first need to debug and fix 
libusb_kernel_driver_active() so the unloading function is called at all. 
I don't know how that's done on macOS but maybe querying the IO registry 
somehow that should have all info about devices and IOKit drivers.

Regards,
BALATON Zoltan