Usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0Ĭdc_acm 1-1.2:1.0: Zero length descriptor referencesĬdc_acm: probe of 1-1.2:1.0 failed with error -22Īdding the NO_UNION_NORMAL quirk for the device fixes the issue.īInterfaceProtocol 1 AT-commands (v. Usb 1-1.2: New USB device found, idVendor=09d8, idProduct=0320 Usb 1-1.2: new full speed USB device using streamplug-ehci and address 4

This results inįailure to bind the device to the driver with the following log: If the device goes back to sleep mode, it needs to be re-plugged and initialized again from step 1. I plugged the device and it correctly got enumerated by the USB driver with address 001:003, and assigned to the cdcacm driver that created the /dev/ttyACM0 file. The system didn't come with cdcacm, so I cross-compiled it, transferred & insmodded it, and it loaded successfully (confirmed by dmesg). If anyone has any objections, please let me know.Ĭommit 765fb2f181cad669f2beb87842a05d8071f2be85 upstream.Įlatec TWN3 has the union descriptor on data interface. Switch to the usbserial driver using modprobe -r cdcacm & modprobe usbserial vendor0x16f9 product0x0003, resulting in the Comm interface being ignored and Data interface assigned to a USB port. The device has a native CDC ACM USB interface.

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If found and not disconnected, increment * its refcount and return it with its mutex held.Linux-Kernel Archive: usb: cdc_acm: Add quirk for Elatec TWN3 usb: cdc_acm: Add quirk for Elatec TWN3 From: Greg Kroah-Hartman SPDX-License-Identifier: GPL-2.0+ /* * cdc-acm.c * * Copyright (c) 1999 Armin Fuerst * Copyright (c) 1999 Pavel Machek * Copyright (c) 1999 Johannes Erdfelt * Copyright (c) 2000 Vojtech Pavlik * Copyright (c) 2004 Oliver Neukum * Copyright (c) 2005 David Kubicek * Copyright (c) 2011 Johan Hovold * * USB Abstract Control Model driver for USB modems and ISDN adapters * * Sponsored by SuSE */ # undef DEBUG # undef VERBOSE_DEBUG #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include ' cdc-acm.h' #define DRIVER_AUTHOR 'Armin Fuerst, Pavel Machek, Johannes Erdfelt, Vojtech Pavlik, David Kubicek, Johan Hovold' #define DRIVER_DESC 'USB Abstract Control Model driver for USB modems and ISDN adapters' static struct usb_driver acm_driver static struct tty_driver * acm_tty_driver static DEFINE_IDR ( acm_minors ) static DEFINE_MUTEX ( acm_minors_lock ) static void acm_tty_set_termios ( struct tty_struct * tty, struct ktermios * termios_old ) /* * acm_minors accessors */ /* * Look up an ACM structure by minor.

Linux usb cdc acm driver