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From: Programmingkid <programmingkidx@gmail.com>
To: Gerd Hoffmann <gerd@kraxel.org>
Cc: Howard Spoelstra <hsp.cat7@gmail.com>,
	QEMU devel list <qemu-devel@nongnu.org>
Subject: Re: Mac OS real USB device support issue
Date: Wed, 14 Apr 2021 10:03:45 -0400	[thread overview]
Message-ID: <1F8803E0-D336-4B36-AC0B-7824678E7C52@gmail.com> (raw)
In-Reply-To: <20210409080804.vs2r546gy3ntdmgr@sirius.home.kraxel.org>



> On Apr 9, 2021, at 4:08 AM, Gerd Hoffmann <gerd@kraxel.org> wrote:
> 
>  Hi,
> 
>> The questions that come to mind are:
>> - Does libusb_detach_kernel_driver() work on Mac OS?
>> - Is libusb_detach_kernel_driver() called on Mac OS in QEMU?
>> 
>> The only mention of this function in QEMU comes from host-libusb.c. 
>> 
>> After some tests I found out the function
>> host-libusb.c:usb_host_detach_kernel() is being called on Mac OS 11.1.
>> It never reaches the libusb_detach_kernel_driver() function. It stops
>> at the continue statement.
> 
> Yep.  Most likely libusb_kernel_driver_active() returns 0 because the
> kernel driver management functions are not implemented for macos.
> 
> take care,
>  Gerd
> 

I was wondering about the usb_host_detach_kernel() code. It iterates thru interface 0 to 15. Why does it stop at 15? Isn't possible to have up to 255 interfaces?

      reply	other threads:[~2021-04-14 14:05 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-06 13:44 Mac OS real USB device support issue Programmingkid
2021-04-06 14:01 ` Howard Spoelstra
2021-04-06 14:20   ` BALATON Zoltan
2021-04-06 14:33     ` Programmingkid
2021-04-06 14:31   ` Programmingkid
2021-04-06 16:53     ` BALATON Zoltan
2021-04-06 19:28       ` Programmingkid
2021-04-06 23:18         ` BALATON Zoltan
2021-04-07  1:52           ` Programmingkid
2021-04-07  5:26             ` Howard Spoelstra
2021-04-07  5:28               ` Howard Spoelstra
2021-04-07 10:27                 ` BALATON Zoltan
2021-04-09 19:37                 ` Programmingkid
2021-04-10  7:28                   ` Howard Spoelstra
2021-04-10 11:29                     ` BALATON Zoltan
2021-05-16  0:33                       ` Programmingkid
2021-04-08 11:05             ` Gerd Hoffmann
2021-04-08 16:40               ` Howard Spoelstra
2021-04-08 19:50                 ` Programmingkid
2021-04-08 19:43               ` Programmingkid
2021-04-09  8:08                 ` Gerd Hoffmann
2021-04-14 14:03                   ` Programmingkid [this message]

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