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  1. #1

    Test usb ports


    I want to test automatically if the USB ports are in use.
    I want to test it in a bash script

    I found some information about ttyUSB0 in the /dev/

    The problem is, there is usb hub between the system and the mouse/keyboard. The other USB port is in use for the Ubuntu live usb.
    When I open the /dev/ map virtual and pull out the usb keyboard the hidraw1 diappears, same for the keyboard.
    When both are out and I pull out the usb hub, nothing happens.

    Do anyone know how to test it?

    Thank you very much!


  2. #2
    Linux Guru Rubberman's Avatar
    Join Date
    Apr 2009
    I can be found either 40 miles west of Chicago, in Chicago, or in a galaxy far, far away.
    Run the command 'lsusb'. You should get output something like this:
    Bus 001 Device 003: ID 04b8:0005 Seiko Epson Corp. Stylus D88+
    Bus 001 Device 001: ID 0000:0000
    Bus 003 Device 001: ID 0000:0000
    Bus 004 Device 001: ID 0000:0000
    Bus 005 Device 001: ID 0000:0000
    Bus 002 Device 001: ID 0000:0000
    Notice the first line. That is the one port I have with something connected. I think the entries for "Device 001" are for the hubs. If a port doesn't have anything attached, then it doesn't appear in the list. So, to answer your question, you can find out what is attached, but you cannot see unused ports with the simple invocation of lsusb. However, "lsusb -v" will give verbose information about your devices, including hubs. For a hub, it will show how many ports it has. Each hub device will show up in the verbose listing something like this:
    Bus 002 Device 001: ID 0000:0000
    Device Descriptor:
      bLength                18
      bDescriptorType         1
      bcdUSB               1.10
      bDeviceClass            9 Hub
      bDeviceSubClass         0 Unused
      bDeviceProtocol         0 Full speed (or root) hub
      bMaxPacketSize0        64
      idVendor           0x0000
      idProduct          0x0000
      bcdDevice            2.06
      iManufacturer           3 Linux 2.6.18-164.9.1.el5 uhci_hcd
      iProduct                2 UHCI Host Controller
      iSerial                 1 0000:00:1d.0
      bNumConfigurations      1
      Configuration Descriptor:
        bLength                 9
        bDescriptorType         2
        wTotalLength           25
        bNumInterfaces          1
        bConfigurationValue     1
        iConfiguration          0
        bmAttributes         0xe0
          Self Powered
          Remote Wakeup
        MaxPower                0mA
        Interface Descriptor:
          bLength                 9
          bDescriptorType         4
          bInterfaceNumber        0
          bAlternateSetting       0
          bNumEndpoints           1
          bInterfaceClass         9 Hub
          bInterfaceSubClass      0 Unused
          bInterfaceProtocol      0 Full speed (or root) hub
          iInterface              0
          Endpoint Descriptor:
            bLength                 7
            bDescriptorType         5
            bEndpointAddress     0x81  EP 1 IN
            bmAttributes            3
              Transfer Type            Interrupt
              Synch Type               None
              Usage Type               Data
            wMaxPacketSize     0x0002  1x 2 bytes
            bInterval             255
    Hub Descriptor:
      bLength               9
      bDescriptorType      41
      nNbrPorts             2
      wHubCharacteristic 0x000a
        No power switching (usb 1.0)
        Per-port overcurrent protection
      bPwrOn2PwrGood        1 * 2 milli seconds
      bHubContrCurrent      0 milli Ampere
      DeviceRemovable    0x00
      PortPwrCtrlMask    0x80
     Hub Port Status:
       Port 1: 0000.0100 power
       Port 2: 0000.0100 power
    Notice under the section "Hub Descriptor:" the subfield "nNbrPorts". This shows how many ports are available on that hub. Externally attached hubs will also show up here, where they won't in the short listing.

    I hope this clarifies stuff for you. You can grep the nNbrPorts from the output of "lsusb -v" in a script easily enough. Also, each hub listing, such as that shown above, will tell you if any of its ports are powered or not, as well as a lot of other information you probably don't need as yet.
    Sometimes, real fast is almost as good as real time.
    Just remember, Semper Gumbi - always be flexible!

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