IKALOGIC Scanalogic-2/Info

dmesg

usb 5-3: new low speed USB device using ohci_hcd and address 79
usb 5-3: New USB device found, idVendor=20a0, idProduct=4123
usb 5-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 5-3: Product: SCANALOGIC
usb 5-3: Manufacturer: ikalogic
usb 5-3: configuration #1 chosen from 1 choice
generic-usb 0003:20A0:4123.0028: hiddev0,hidraw2: USB HID v1.01 Device [ikalogic SCANALOGIC] on usb-0000:00:13.0-3/input0

Unbinding the usbhid driver

In order to get HID descriptor output in lsusb you need to either rmmod usbhid (which will disable all USB HID devices, including your USB keyboard/mouse!) or just unbind a specific driver instance.

Example:

$ ls /sys/bus/usb/drivers/usbhid
3-2:1.0  4-3:1.4  5-3:1.0  bind  module  new_id  uevent  unbind

$ echo 5-3:1.0 > /sys/bus/usb/drivers/usbhid/unbind

lsusb

This is the lsusb ouput on Linux (you need to do rmmod usbhid or unbind the usbhid driver to also get the HID descriptor output in lsusb, see above):

$ lsusb -vvv
Bus 005 Device 076: ID 20a0:4123 Clay Logic
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x20a0 Clay Logic
  idProduct          0x4123 
  bcdDevice            1.00
  iManufacturer           1 ikalogic
  iProduct                2 SCANALOGIC
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0x80
      (Bus Powered)
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 No Subclass
      bInterfaceProtocol      0 None
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.01
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      22
          Report Descriptor: (length is 22)
            Item(Global): Usage Page, data= [ 0x00 0xff ] 65280
                            (null)
            Item(Local ): Usage, data= [ 0x01 ] 1
                            (null)
            Item(Main  ): Collection, data= [ 0x01 ] 1
                            Application
            Item(Global): Logical Minimum, data= [ 0x00 ] 0
            Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255
            Item(Global): Report Size, data= [ 0x08 ] 8
            Item(Global): Report Count, data= [ 0x80 ] 128
            Item(Local ): Usage, data= [ 0x00 ] 0
                            (null)
            Item(Main  ): Feature, data= [ 0x02 0x01 ] 258
                            Data Variable Absolute No_Wrap Linear
                            Preferred_State No_Null_Position Non_Volatile Buffered Bytes
            Item(Main  ): End Collection, data=none
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0008  1x 8 bytes
        bInterval             100
Device Status:     0x0000
  (Bus Powered)