usbhid-dump(8)           (February 2012)           usbhid-dump(8)

          usbhid-dump - dump USB HID device report descriptors and

          usbhid-dump [OPTION]...

          usbhid-dump uses libusb to dump report descriptors and
          streams from HID (human interface device) interfaces of USB
          devices.  By default, it dumps HID interfaces of all con-
          nected USB devices, but could be limited to a subset of
          them, or to a single interface, using options.

          NOTE: usbhid-dump detaches kernel drivers from the inter-
          faces it dumps and uses them exclusively, so no other pro-
          gram receives the input in the meantime.  The report
          descriptor dumping is instantaneous, but the stream dumping
          continues until terminated with SIGINT (^C from the termi-
          nal) or a timeout expires.

          If you accidentally start dumping a stream from the USB key-
          board you use to control the terminal, the system will stop
          receiving the input and you won't be able to terminate
          usbhid-dump. Just stop your input and wait until the timeout
          expires. The stream dumping will stop, the keyboard will be
          reattached to the kernel driver and you will regain control.

          The default stream dumping timeout is 60 seconds and could
          be changed with the -t option.

          -h, --help
               Output a help message and exit.

          -v, --version
               Output version information and exit.

          -s, -a, --address=bus[:dev]
               Limit interfaces by bus number and device address. Both
               1-255, decimal.  Zeroes match any bus or device.

          -d, -m, --model=vid[:pid]
               Limit interfaces by device vendor and product IDs. Both
               1-FFFF, hexadecimal.  Zeroes match any vendor or prod-

          -i, --interface=NUMBER
               Limit interfaces by number (0-254), decimal. 255
               matches any interface.

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     usbhid-dump(8)           (February 2012)           usbhid-dump(8)

          -e, --entity=STRING
               The entity to dump: either "descriptor", "stream" or
               "all". The value can be abbreviated down to one letter.
               The default is "descriptor".

          -t, --stream-timeout=NUMBER
               Stream interrupt transfer timeout, ms. Zero means
               infinity. The default is 60000 (60 seconds).

          -p, --stream-paused
               Start with the stream dump output paused.

          -f, --stream-feedback
               Enable stream dumping feedback: print a dot to stderr
               for every transfer dumped.

               Pause/resume stream dump output.

          usbhid-dump outputs dumps in chunks. Each chunk is separated
          by an empty line and starts with the following header line:


          Here, BUS, DEVICE and INTERFACE are bus, device and inter-
          face numbers respectively. ENTITY is either "DESCRIPTOR" or
          "STREAM". TIMESTAMP is timestamp in seconds since epoch.

          After the header the actual dump data follows as hex bytes.
          A descriptor chunk includes the whole report descriptor.
          Every stream chunk includes a whole report, usually, but if
          a report is bigger than endpoint's wMaxPacketSize, it will
          span several chunks.

          Dump report descriptor for a device with address 3 on bus number
               usbhid-dump -a 2:3

     ID 0x0005:
          Dump report stream for a device with vendor ID 0x5543 and product
               usbhid-dump -m 5543:0005 -es

     ID 0x5543:
          Dump report descriptor from interface 1 of a device with vendor
               usbhid-dump -m 5543 -i 1 -ed

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     usbhid-dump(8)           (February 2012)           usbhid-dump(8)

     (caution: you will lose control over the terminal if you use USB
          Dump report streams from all HID interfaces of all USB devices
               usbhid-dump -es

          Nikolai Kondrashov <>

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