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@vger.kernel.org 
> 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
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