Hi Casey, On 2012.07.31 04:12, Casey Bajema wrote: > I'm trying to use a USB device over a Belkin network hub > <http://www.belkin.com/networkusbhub/>
That's an interesting device... > * The problem seems to be that the network hub doesn't provide a valid > port number (in the device manager it lists the location as > "Location 0 (/Device-Name/)" instead of something like > "Port_#0001.Hub_#0005"). Well, the issue is that the hub doesn't provide an SPDRP_ADDRESS when queried with SetupDiGetDeviceRegistryProperty(), which all USB devices on Windows are supposed to provide. As a matter of fact, returning an invalid port number was identified as a bug with early NEC USB 3.0 drivers by Microsoft themselves [1]. Therefore, we can probably qualify this issue as a bug with the Belkin network hub driver. I would strongly suggest then that you contact Belkin support to see if they can fix this issue. > libusbx debug message: > [ 0.000000] [00001034] libusbx: warning [windows_get_device_list] could > not retrieve port number for device > '\\.\USB#VID_04D8&PID_0204#1&79F5D87&0&0000', skipping: [13] The data is > invalid. > > > This is probably not how libusbx is typically used but is there an easy > fix or could it be added to a future release? > > * Could the lack of a port number be ignored? or the full address > string be used instead? We need a port number here so the full address won't do. I guess we could force the port number to 1 and try to continue, though there's a possibility it could create problems down the line. Right now my preference would be to see whether Belkin are going to be responsive in trying to fix their driver (since a virtual USB device should provide the same attributes as a regular one). If not, then we can try adding a workaround in libusbx and forcing a port number. Regards, /Pete [1] http://www.winvistatips.com/spdrp_address-cm_drp_address-returns-0-usb-3-0-controller-t816181.html ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ libusbx-devel mailing list libusbx-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libusbx-devel
