On Thu, Mar 29, 2018 at 01:49:02PM +0200, Teichmann, Martin wrote: > Dear Greg, dear Johan, dear list, > > I'm very sorry I was a bit quick in sending you a patch for the PI > E-870 device, because it's actually wrong. Everything seemed to work > fine, until I realized that once in a while two characters were > missing. Checking dmesg I realized error messages had piled up. It > turns out, the device is not compatible with the ftdi_sio driver in > the end. I hope this can be undone... No worries, I just sent a revert patch to Greg. > The device, however works with a usb-serial-simple driver. > Unfortunately, it is not as easy as for the E-870 to supply a patch, > as usb-serial-simple does not just contain a list of VID and PIDs, but > actually creates a new entry somewhere in /sys/bus for each vendor. I > would like to send in patch for this later, but this time properly > tested... Try first to determine what chip this really is (e.g. by opening the device). Chances are there's already a driver for it. Full "lsusb -v" might also give some clues. Thanks, Johan