Re: [Libusb-devel] Find specific USB device based on udev info

[Alan S. <st...@ro...>]

On Fri, 1 Jul 2011, Pete Batard wrote:

> On 2011.07.01 15:57, Alan Stern wrote:
> > So far not much has been written (I think part of this was implemented
> > in the Windows port of libusb).
> 
> The following have been in my branch for some time (libusb.h [1], line 890):
> 
> uint8_t LIBUSB_CALL libusb_get_port_number(libusb_device *dev);
> libusb_device * LIBUSB_CALL libusb_get_parent(libusb_device *dev);
> int LIBUSB_CALL libusb_get_port_path(libusb_context *ctx, libusb_device 
> *dev, uint8_t* path, uint8_t path_length);
> 
> Currently, these calls will return an error for OSX and Linux, but 
> should work on Windows. As a matter of fact, the xusb sample will 
> automatically display some topology information when ran on Windows. eg:
> 
>    bus: 7, port path from HCD: 4->4->1
> 
> If anybody wants to send a Linux or Mac implementation for the calls 
> above, I'd be happy to include it in my branch.

Okay, I have an implementation for the Linux backend.  There's also a 
fix for the xusb program.  Two patches follow.

Alan Stern