On Mon, Nov 11, 2019 at 11:11:06AM -0500, Jeffrey Walton wrote: > Hi Everyone, > > I'm having trouble with a C application that opens a USB modem. The > application is not receiving some data from a USR modem. Conexant > modems are OK. > > I'm working through > https://www.kernel.org/doc/Documentation/usb/usbmon.txt . I found the > modem at Bus=01 Dev=24: > > T: Bus=01 Lev=03 Prnt=07 Port=00 Cnt=01 Dev#= 24 Spd=480 MxCh= 0 > D: Ver= 2.00 Cls=02(comm.) Sub=00 Prot=00 MxPS=64 #Cfgs= 1 > P: Vendor=0baf ProdID=0303 Rev= 2.00 > S: Manufacturer=U.S.Robotics > S: Product=USB Modem > > This is where my confusion lies. It is not clear to me how to > determine which socket to use for step #3 in usbmon.txt. Step #3 says: > > # cat /sys/kernel/debug/usb/usbmon/3u > /tmp/1.mon.out > > How do I determine which socket to use for Bus=01 Dev=24? >From the above documentation, it says to use "3u" for all devices on the 3rd bus. You want the 1st bus, right? So did you try using "1u"? I think wireshark can intrepret usbmon output, so maybe just use that instead and point it at the USB bus you want to watch? good luck! greg k-h _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
