Re: Mac OS real USB device support issue

[Programmingkid]

> On Apr 8, 2021, at 12:40 PM, Howard Spoelstra <hsp.cat7@gmail.com> wrote:
> 
> 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

We could also consider our own git submodule incase the libusb people fail to 
fix their issue.