[libhid-discuss] retrieving large HID descriptor bytes

[mike stone]

Xiaofan Chen <xiaofanc <at> gmail.com> writes:

> 
> On Wed, Jun 16, 2010 at 1:34 AM, stone mike <vrspace1987 <at> yahoo.com.tw> 
wrote:
> >          Report Descriptors:
> >            ** UNAVAILABLE **
> 
> What if you do not use libhid, but use the vanilla usbutils (lsusb -vvv)?
> You need to detach the kernel HID driver first. To do that, you
> can use libhid-detach-device.
> 


Hi Xiaofan,

     Thanks,  lsusb can get Report Descriptors, libhid-detach-device has a ...
hid_force_open failed with return code 16 message.

root at ubuntu:~# lsusb
Bus 007 Device 002: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 002: ID 09d9:64df KRF Tech, Ltd 
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 002: ID 046d:c016 Logitech, Inc. M-UV69a/HP M-UV96 Optical Wheel
Mouse
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
root at ubuntu:~# libhid-detach-device 09d9:64df
Trying to detach HID with IDs 09d9:64df... hid_force_open failed with return
code 16.
root at ubuntu:~# lsusb -d 09d9:64df -vvv

Bus 008 Device 002: ID 09d9:64df KRF Tech, Ltd 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x09d9 KRF Tech, Ltd
  idProduct          0x64df 
  bcdDevice            0.01
  iManufacturer           3 Jungo
  iProduct                2 JUSB Stack
  iSerial                 4 0123456789ABCDEF
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           34
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xc0
      Self 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              1 Wintracker III
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength      28
          Report Descriptor: (length is 28)
            Item(Global): Usage Page, data= [ 0xa0 0xff ] 65440
                            (null)
            Item(Local ): Usage, data= [ 0x01 ] 1
                            (null)
            Item(Main  ): Collection, data= [ 0x01 ] 1
                            Application
            Item(Local ): Usage, data= [ 0x01 ] 1
                            (null)
            Item(Global): Logical Minimum, data= [ 0x00 ] 0
            Item(Global): Logical Maximum, data= [ 0xff ] 255
            Item(Global): Report Size, data= [ 0x08 ] 8
            Item(Global): Report Count, data= [ 0x18 ] 24
            Item(Main  ): Input, data= [ 0x00 ] 0
                            Data Array Absolute No_Wrap Linear
                            Preferred_State No_Null_Position Non_Volatile
 Bitfield
            Item(Local ): Usage, data= [ 0x02 ] 2
                            (null)
            Item(Global): Report Size, data= [ 0x08 ] 8
            Item(Global): Report Count, data= [ 0x18 ] 24
            Item(Main  ): Output, data= [ 0x00 ] 0
                            Data Array Absolute No_Wrap Linear
                            Preferred_State No_Null_Position Non_Volatile
 Bitfield
            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     0x0018  1x 24 bytes
        bInterval               2
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0001
  Self Powered
root at ubuntu:~#