LibUSB fails to enumerate all devices

[Loren M. Lang]

On Mon, Oct 24, 2005 at 10:54:30PM +0200, Hans Petter Selasky wrote:
> On Monday 24 October 2005 21:51, Brian K. White wrote:
> > ----- Original Message -----
> > From: "Loren M. Lang" <lorenl at alzatex.com>
> > To: <freebsd-usb at freebsd.org>
> > Sent: Sunday, October 23, 2005 5:51 AM
> > Subject: LibUSB fails to enumerate all devices
> >
> > I am developing a USB device which has two interfaces, one interface
> > uses a standard HID protocol, the other is completely custom at the
> > moment.  FreeBSD attaches appropriately to the HID interface and works
> > correctly.  For the custom interface, I was going to write a device
> > driver in userspace using libusb, but I can't seem to find it.  I wrote
> > a program to enumerate all devices on all busses, but the only device I
> > see is the one device I don't have any driver loaded for.  Does FreeBSD
> > not allow a userspace to access an interface of a usb device when any of
> > it's interfaces are grabbed by a kernel driver even though the interface
> > I want is not grabbed?
> 
> No. ugen, which is the device libusb is searching for, is only created when no 
> subdevices has been attached. It is not impossible to have a shadow "ugen" 
> hanging on all USB devices, but it is a little complicated, because you get 
> two applications that can set the configuration: ugen and the USB device 
> driver. Whenever the configuration number is set, all ugen devices in /dev 
> must be re-created, and one should detach existing, attached USB sub-devices.

So LibUSB can only access USB devices that have an associated ugen
device?  And a usb device which has a kernel driver attached to any
interface will not have a ugen device available?  Is there any way,
LibUSB or not, to access the second interface of my device from
userspace or would it require a kerne driver?  Only the first interface
is attached to anything.

> 
> --HPS
> 

-- 
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