[libhid-discuss] How to use libhid-detach-device to detach kernel hid driver for a composite device

[Charles Lepple]

On Oct 24, 2008, at 11:41 AM, Xiaofan Chen wrote:

> Reference:
> http://forum.microchip.com/tm.aspx?m=364987

The signal-to-noise ratio of that thread is pretty low. What are we  
looking at?

> I have a keyboard which posts as a USB composite device. To dump
> the hid report descriptor under Linux, I need to detach the kernel  
> hid driver
> in order to use "lsusb -vvv" to dump the HID report descriptor.  
> Somehow
> libhid-detach-device can only detach the first interface (interface  
> 0).
>
> Is it possible to patch it to be able to detach other interfaces?
> I am not a real programmer though...

See http://libhid.alioth.debian.org/doc/ 
hid__opening_8c.html#1ca48853ebe890459271bdb99b8aaac6

The second parameter to hid_force_open() is the interface number.

-- 
Charles Lepple