[BTW, please subscribe to the list, or you may not get replies from people who reply only to the list.]
On Aug 1, 2007, at 3:05 PM, Peter Stuge wrote: > On Wed, Aug 01, 2007 at 12:28:59PM -0500, Justin Williams wrote: >> Hey guys... I've ran into a problem with the libhid. Well, not so >> much libhid, more my lack of understanding of the USB Bus system. > > I recommend checking out the USB spec, it's not too bad. specifically, the HID Class Definition: http://www.usb.org/developers/hidpage/#Class_Definition >> Since this is a card reader, I need to get the handle on it, etc, >> then simply loop and read when data is available. > > Is it impossible for you to let the card reader work as a normal > keyboard through the kernel HID driver and just have your program > read stdin? That is by far the easiet way to get the data. I would guess that the Linux kernel HID driver wouldn't expose this as a keyboard (it uses a non-keyboard usage page: 0xff00), but you might also be able to read events from the evdev interface (/dev/ input/event* or something). This appears to be the catch-all for non-standard usage pages: http://lxr.linux.no/source/drivers/hid/hid-input.c#L610 As far as the usage path to use, what do you get when you modify the sample code to connect to your device? It should dump a list of usage paths for the report descriptor. -- Charles Lepple _______________________________________________ libhid-discuss mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/libhid-discuss
