Powercycling USB device on hub

[Hans Petter Selasky]

On Saturday 23 July 2011 18:53:46 Peer Stritzinger wrote:
> On Sat, Jul 23, 2011 at 5:55 PM, Hans Petter Selasky <hselasky at c2i.net> 
wrote:
> >> Since power-cycling needs to reset the HUB I now have the problem to
> >> find out on which HUB in the system my device hangs.
> >> 
> >> There are two HUB's on the same root HUB and I don't want to
> >> power-cycle all devices.  Is there a way to learn the physical
> >> structure of a USB bus?
> > 
> > devinfo
> > 
> > Address 1 is always the root HUB.
> 
> Tried this already but it only shows the hubs but none of my devices
> because they have no driver (custom built USB devices, only talk to
> them via libusb).
> 
> e.g.
> 
>           usbus3
>             uhub3
>               uhub4 pnpinfo vendor=0x0424 product=0x2514 devclass=0x09
> devsubclass=0x00 sernum="" release=0x0bb3 intclass=0x09
> intsubclass=0x00 at port=7 interface=0
>               uhub5 pnpinfo vendor=0x0424 product=0x2514 devclass=0x09
> devsubclass=0x00 sernum="" release=0x0bb3 intclass=0x09
> intsubclass=0x00 at port=8 interface=0
> 
> There is one of the devices attached either to uhub4 or uhub5 (visible
> in usbconfig) but nothing shown in devinfo (even with -v).
> 
> -- Peer


In newer libusb there is a function to get the parent HUB address.

--HPS