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I want to find /dev/ location of a USB device. The main thing is, it's not a drive or any other mass storage , it is basically only a USB modem and wvdial can not detect it. So I just want the location of my device, so that I can do something to get it detected.

System log after connecting device:

[ 1162.830797] usb 3-2: new full-speed USB device number 4 using xhci_hcd<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1162.848198] usb 3-2: New USB device found, idVendor=12d1, idProduct=1505<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1162.848205] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=4<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1162.848209] usb 3-2: Product: HUAWEI Mobile<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1162.848212] usb 3-2: Manufacturer: HUAÿWEI TECHNOLOGIES<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1162.848215] usb 3-2: SerialNumber: ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1162.848957] scsi8 : usb-storage 3-2:1.0<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC mtp-probe: checking bus 3, device 4: "/sys/devices/pci0000:00/0000:00:14.0/usb3/3-2"<br>
Aug 18 16:30:32 hunter-350V5C-351V5C-3540VC-3440VC mtp-probe: bus: 3, device: 4 was not an MTP device<br>
Aug 18 16:30:33 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1163.847402] scsi 8:0:0:0: CD-ROM            HUAWEI   Mass Storage     2.31 PQ: 0 ANSI: 0<br>
Aug 18 16:30:33 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1163.857317] sr1: scsi-1 drive
Aug 18 16:30:33 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1163.857570] sr 8:0:0:0: Attached scsi CD-ROM sr1<br>
Aug 18 16:30:33 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1163.857741] sr 8:0:0:0: Attached scsi generic sg3 type 5<br>
Aug 18 16:30:33 hunter-350V5C-351V5C-3540VC-3440VC kernel: [ 1163.881325] xhci_hcd 0000:00:14.0: WARN Event TRB for slot 3 ep 14 with no TDs queued?<br>
Aug 18 16:30:33 hunter-350V5C-351V5C-3540VC-3440VC usb_modeswitch: switching device 12d1:1505 on 003/004<br>
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lsusb to list usb devices. The 6th column is the device ID. dmesg | grep deviceID. You should also search online for that device ID to more information. –  justbrowsing Aug 18 '13 at 9:59
    
hey i know what my device is in output of lsusb , but lsusb do not tell the mount point, and dmesg too shows the device but not mount location. thanks for taking interest –  Sachin Verma Aug 18 '13 at 10:02
    
df shows mount point at last column (Mount on).. –  Sepahrad Salour Aug 18 '13 at 10:32
1  
Uh, if it is not a storage device, you don't actually mount it in that sense, and it will definitely not be visible with df. Instead, you should have the OS to detect the device and use the correct driver so that it will appear in /dev. Most likely things that happen when you plug the modem in are shown in /var/log/messages and/or /var/log/syslog and the logs might even state the device file assosiated with the modem. Please post the logs related to plugging in the device here. –  zagrimsan Aug 18 '13 at 10:50
    
@zagrimsan , now can u help me track the device location in /dev/ttyUSB or something?? –  Sachin Verma Aug 18 '13 at 11:03

2 Answers 2

The log you posted reveals the device ID is 12d1:1505

Googling I found this modem needs to mode switched

According to the ArchLinux package manifest a config for your modem is present, so it should be included upstream and available for any up-to-date distro.

1.) Install the usb_modeswitch package

2.) Optional: If the udev rule doesn't kick in manually force it

sudo usb_modeswitch -I -W -c 12d1:1505 

More information available on this wiki

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hey , i too think it needs to be mode switch, I hace installed usb_modeswitch, now how to enable?? thanks for helping –  Sachin Verma Aug 18 '13 at 11:36

I have setup usbmodems for nat with shorewall and stuff but I've almost but all forgotten what I did.

If it's making a dev node at all do this just before you plug it:

udevadm monitor

You may need to run as root/sudo I can't remember. This used to tell me where stuff was mounted at etc hopefull this will give you the dev node to access the modem :)

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