[libhid-discuss] finding multile devices

[Charles Lepple]

On Jan 12, 2008, at 7:15 PM, Warren Jasper wrote:

> Should this line not read:
>
>   if (usb_claim_interface(usbdev_h, hidif->interface))  
> continue;   // returns 0 on success
>
> Now I am "more" certain that devices that need to be matched have  
> NOT been matched previously.


I agree, except in cases where usb_claim_interface() fails because we  
subsequently need to detach the kernel device driver (a la  
hid_force_open()).

Last time I checked (admittedly, not very recently) there is no way  
to tell (non-destructively) the difference between a HID device that  
has been claimed by the kernel but is not being used in userspace, a  
device that has been claimed by the kernel and is actively being  
used, and a device that has had its kernel driver detached and may or  
may not be used by libusb or libhid.

-- 
Charles Lepple