On Thu, Apr 13, 2017 at 10:50:59AM +0200, Ralf Hartmann wrote: > '09d8 0320' and '09d8 0420' ('vendor' 'product') are serial devices. > This are TWN3 and TWN4 RFID-CardREaders from elatec GmbH. > > They work fine with the generic driver. Thanks for the report. > Here the output of dmesg (TWN4 connected) > > [ 837.228021] usb 4-1: new full-speed USB device number 4 using uhci_hcd > [ 837.409161] usb 4-1: New USB device found, idVendor=09d8, idProduct=0420 > [ 837.409165] usb 4-1: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [ 837.409168] usb 4-1: Product: RFID Device (CDC) > [ 837.409169] usb 4-1: Manufacturer: OEM > [ 837.413225] usbserial_generic 4-1:1.0: Generic device with no bulk > out, not allowed. > [ 837.413234] usbserial_generic: probe of 4-1:1.0 failed with error -5 > [ 837.413293] usbserial_generic 4-1:1.1: The "generic" usb-serial > driver is only for testing and one-off prototypes. > [ 837.413295] usbserial_generic 4-1:1.1: Tell linux-usb@xxxxxxxxxxxxxxx > to add your device to a proper driver. > [ 837.413297] usbserial_generic 4-1:1.1: generic converter detected > [ 837.413369] usb 4-1: generic converter now attached to ttyUSB2 But you at least don't want to (attempt to) bind to the first interface it seems. What is the output of "lsusb -v" for these devices? Thanks, Johan -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html