[libhid-discuss] Multiple duplicate interfaces?

[Charles Lepple]

On Oct 2, 2010, at 3:20 PM, Frank Rizzo wrote:

> Hey guys, I'm trying to work with a barcode scanner that thinks it's  
> a keyboard.
>
> What path do I use for this?  (Probably more data that you need  
> below, but I believe in being through).

Your best bet is to try the operating system interfaces first. Since  
you posted output from 'lsusb', I'm going to assume Linux.

Linux grabs any keyboard, mouse or joystick that presents itself as a  
standard HID device. You might be able to find the /dev/input node  
corresponding to the device and do something specific to the barcode  
scanner, but that's outside the scope of libhid.

If you scan a barcode, does it look like characters are being typed in  
your terminal?

Not sure what you mean by "multiple duplicate interfaces", since there  
seems to only be one configuration listed in lsusb (and one interface  
for that configuration). If you are referring to the duplicate debug  
lines from libhid, that's a well-known bug in the hidparser debug code  
relating to ranges of Usage codes (from "Usage Minimum" and "Usage  
Maximum" tags in the HID report descriptor).