Mdthbs

I'm running Jessie Lite on a RPi2. When I connect my USB to Serial device it does show up, however the driver is not assigned.

lsusb -t



/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=dwc_otg/1p, 480M

    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/5p, 480M

        |__ Port 1: Dev 3, If 0, Class=Vendor Specific Class, Driver=smsc95xx, 480M

        |__ Port 3: Dev 13, If 0, Class=Vendor Specific Class, Driver=, 12M

The CP210x driver from Silicon Labs seems to be installed:

lsmod



Module                  Size  Used by

cp210x                  9419  0 

usbserial              29964  1 cp210x

Now I did try manual binding without success:

echo -n "1-1.3:1.0" > /sys/bus/usb/drivers/cp210x/bind



write error: No such device

Since I'm fairly new to Linux and I need that thing running, I'd be grateful for suggestions. Side note: I have a little Python script running on a Windows machine that is able to talk to the very device just fine...

The device is there, I can't figure out why it's not been found:

tree /sys/bus/usb/devices/



├── 1-1.3 -> ../../../devices/platform/soc/20980000.usb/usb1/1-1/1-1.3

├── 1-1.3:1.0 -> ../../../devices/platform/soc/20980000.usb/usb1/1-1/1-1.3/1-1.3:1.0

Might the additional information from usb-devices help finding the problem?

T:  Bus=01 Lev=02 Prnt=02 Port=04 Cnt=02 Dev#=  6 Spd=12  MxCh= 0

D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1

P:  Vendor=18ef ProdID=e030 Rev=01.00

S:  Manufacturer=Silicon Labs

S:  Product=ALC 8500 Expert

S:  SerialNumber=3ENAEFJAVJCO9AQQ

C:  #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA

I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=00 Prot=00 Driver=(none)

Add a rule to udev that will automatically load a driver for an USB device.

Information needed:

• USB device PID / VID numbers. lsusb output. Does not show in tree mode. lsusb -t
  


• Device driver modprobe command. /sbin/modprobe usb-storage
  

Create a udev rule.

Add your own rule file under /etc/udev/rules.d

sudo vi /etc/udev/rules.d/80-serialToUsb_PID-VID.rules

When you add the rule for udev. This will allow udev to automatically load the driver, upon USB insertion, for any device with the pid/vid listed.

• Replace #PID# with the PID of your device.


• Replace #VID# with the VID of your device.


• Replace #DRIVER# with the command to load the module.


• Replace #SYS# with the location of the driver under the /sys
  directory.

ACTION=="add", ATTRS{idVendor}=="#VID#", ATTRS{idProduct}=="#PID#", RUN+="#DRIVER#" RUN+="/bin/sh -c 'echo #PID# #VID# > #SYS#'"

Restart udev

sudo /etc/init.d/udev restart

Attach the device and use dmesg to verify

Here is an example I used for a custom mp3 player.

ACTION=="add", ATTRS{idVendor}=="a000", ATTRS{idProduct}=="a000", RUN+="/sbin/modprobe usb-storage" RUN+="/bin/sh -c 'echo a000 a000 > /sys/bus/usb/drivers/usb-storage/new_id'"

This works on Debian 8, and Ubuntu 14.

You are using Debian lite. So, I'm am not 100% sure this will work for you.

I have a Freescale embedded device, mx23, that uses mdev instead of udev and the procedure is a bit different.