gen0.4: <Touchscreen ELAN> at usbus0, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON (1
00mA)

  bLength = 0x0012
  bDescriptorType = 0x0001
  bcdUSB = 0x0201
  bDeviceClass = 0x0000  <Probed by interface class>
  bDeviceSubClass = 0x0000
  bDeviceProtocol = 0x0000
  bMaxPacketSize0 = 0x0008
  idVendor = 0x04f3
  idProduct = 0x2071
  bcdDevice = 0x5107
  iManufacturer = 0x0004  <ELAN>
  iProduct = 0x000e  <Touchscreen>
  iSerialNumber = 0x0000  <no string>
  bNumConfigurations = 0x0001


 Configuration index 0

    bLength = 0x0009
    bDescriptorType = 0x0002
    wTotalLength = 0x0029
    bNumInterfaces = 0x0001
    bConfigurationValue = 0x0001
    iConfiguration = 0x0000  <no string>
    bmAttributes = 0x00e0
    bMaxPower = 0x0032

    Interface 0
      bLength = 0x0009
      bDescriptorType = 0x0004
      bInterfaceNumber = 0x0000
      bAlternateSetting = 0x0000
      bNumEndpoints = 0x0002
      bInterfaceClass = 0x0003  <HID device>
      bInterfaceSubClass = 0x0000
      bInterfaceProtocol = 0x0000
      iInterface = 0x0000  <no string>

      Additional Descriptor

      bLength = 0x09
      bDescriptorType = 0x21
      bDescriptorSubType = 0x10
       RAW dump:
       0x00 | 0x09, 0x21, 0x10, 0x01, 0x00, 0x01, 0x22, 0x30,
       0x08 | 0x04

     Endpoint 0
        bLength = 0x0007
        bDescriptorType = 0x0005
        bEndpointAddress = 0x0081  <IN>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x0040
        bInterval = 0x0001
        bRefresh = 0x0000
        bSynchAddress = 0x0000

     Endpoint 1
        bLength = 0x0007
        bDescriptorType = 0x0005
        bEndpointAddress = 0x0002  <OUT>
        bmAttributes = 0x0003  <INTERRUPT>
        wMaxPacketSize = 0x0040
        bInterval = 0x0002
        bRefresh = 0x0000
        bSynchAddress = 0x0000