Re: [Libusb-devel] libusb on OSX keeps returning -EBUSY for claim_interface

[Philippe B. <phi...@gm...>]

I a running into the same problem.
Claiming interface fails because it is supposedly taken by another process.

Does anyone has a workaround documented ?
I'll look into the APCUPSD code, but it seems a complex method, at 
firstglance.

TIA,
--Philippe

Xiaofan Chen wrote:
> On 8/27/07, Soumen Mondal <ms...@so...> wrote:
>> It seems like the interface is already claimed by kernel driver. To
>> release the interface, you need to call the below function, before
>> claiming that interface.
>>
>> int usb_detach_kernel_driver_np(usb_dev_handle *dev, int interface);
>>
>> Please refer usb.h for more info.
>>
> 
> That does not work for Mac OS X and only works for Linux.
> 
> There is a change the OP can write a "simple dummy
> kext driver". I just leant this from the libhid list. But I do
> not have a Mac and I do not know how simple it is.
> 
> Quote from:
> http://www.apcupsd.org/manual/USB_Configuration.html
> "During installation, Apcupsd will automatically install a
> simple dummy kext driver designed to prevent Apple's monitoring
> software from taking over the UPS. It is necessary to reboot in
> order to activate the kext."
> 
> If it is an HID device, the easier way might be to work with the
> native HID API and forget about libusb...
> 
> The situation is the same for libusb under FreeBSD. There is
> no easy to detach the kernel HID driver. So one has to recompile
> the kernel to use ugen instead of uhid.
> 
> Xiaofan
> 
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