Question

2

How does my Dongle work automatically?

rated 0 times [ 2] [ 0] / answers: 1 / hits: 2059 / 2 Years ago, sat, april 30, 2022, 2:06:11

I've connected a '3G Dongle' to my PC and I've wondered how it automatically connected in Ubuntu 14.04 without installing any supporting software of the Dongle manually, but I've installed that while I was working in Windows .

lsusb

Bus 001 Device 004: ID 05c6:6001 Qualcomm, Inc.

usb-devices | awk '/6001/' RS=

Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#=  4 Spd=480 MxCh= 0> Ver= 2.00

Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1

Vendor=05c6 ProdID=6001 Rev=00.00

Manufacturer=Qualcomm, Incorporated

Product=Qualcomm mobile device

#Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=500mA

If#= 0 Alt= 0 #EPs= 1 Cls=e0(wlcon) Sub=01 Prot=03 Driver=rndis_host

If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=06 Prot=00 Driver=rndis_host

What is the reason?

Can we edit/view that file and also give some additional details regarding that?

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rinstracte

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2 Years ago

answered 2 Years ago laceanz · Accepted Answer

If you run lsusb terminal command, you will see what chip is installed in your dongle. Your device is

05c6:6001 Qualcomm, Inc.

In most cases Linux identifies the dongle by the chip code 12d1:1506.

Some of devices are implicitly defined in the option kernel module by vendor and product ids, but some are identified by some other parameters.

Your device works as a network card, not as a serial modem and it is identified differently.

You can see in your output Cls=e0(wlcon) this means that the device is a USB_CLASS_WIRELESS_CONTROLLER. That is defined in /include/uapi/linux/usb/ch9.h.

It is managed by rndis_host driver. It is linked to it because Sub=01 Prot=03.

That is defined in the /drivers/net/usb/rndis_host.c in

USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),

.driver_info = (unsigned long) &rndis_info,

Do not look for these files in your computer. They are in the Linux source tree.
E.g. rndis_host.c