HelenOS sources

USBHID_DEV_IFACE   63 uspace/lib/c/include/ipc/dev_iface.h 	USBHID_DEV_IFACE,
USBHID_DEV_IFACE   63 uspace/lib/posix/include/libc/ipc/dev_iface.h 	USBHID_DEV_IFACE,
HelenOS homepage, sources at GitHub