[libhid-discuss] USB - HID query

[Anmol Ranka]

Hi All,

I am working on Fedora Core 5 with Linux kernel version 2.6.15-1. I am new to
Linux development.

I have a USB -HID compound as well as composite device. 

It is compound device because, it consists of two different devices embedded
within a single device through a hub.

It is a composite device because within the same device, there are two
functionalities i.e they same device belongs to audio as well as HID class.

I am interested in performing Input and Output operations on the HID device.
The HID device is generic vendor specific.

While I was searching on the internet for the same, I came to know about
'LIBHID'-- user-space HID access library written in C which provides generic
and flexible way to access and interact with the USB - HID device. 

I downloaded the following package 'libhid_0.2.15+20060325-2.1.tar.gz'. Is it
OK to use this package for Fedora Core 5? If yes, when I install this
package, what will be the name of the libhid library that I have to use and
in which location would it be installed?

I also have following query:

1)To perform input and output operation, I need 'HID usage path'. If I am
right the HID Usage path is obtained from the HID Report Descriptor. In order
to know the HID report descriptor I executed the following command provided
by libhid:

lsusb -d VID:PID -vvv.

The partial output of this command is as follows.

HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.11
          bCountryCode            0
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     172
cannot get report descriptor

Why is the report descriptor not printed?

Any help would be greatly appreciated.

Thanks
Anmol



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