HelenOS sources

usb_hid_protocol_t   48 uspace/lib/usbhid/include/usb/hid/request.h     usb_hid_protocol_t protocol);
usb_hid_protocol_t   57 uspace/lib/usbhid/include/usb/hid/request.h     usb_hid_protocol_t *protocol);
usb_hid_protocol_t  109 uspace/lib/usbhid/src/hidreq.c     usb_hid_protocol_t protocol)
usb_hid_protocol_t  260 uspace/lib/usbhid/src/hidreq.c     usb_hid_protocol_t *protocol)