HelenOS sources
USB_HUB_REQUEST_GET_DESCRIPTOR 578 uspace/drv/bus/usb/ehci/ehci_rh.c CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_GET_DESCRIPTOR),
USB_HUB_REQUEST_GET_DESCRIPTOR 497 uspace/drv/bus/usb/ohci/ohci_rh.c CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_GET_DESCRIPTOR),
USB_HUB_REQUEST_GET_DESCRIPTOR 450 uspace/drv/bus/usb/uhci/uhci_rh.c CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_GET_DESCRIPTOR),
USB_HUB_REQUEST_GET_DESCRIPTOR 379 uspace/drv/bus/usb/vhc/hub/virthubops.c CLASS_REQ_IN(REC_DEVICE, USB_HUB_REQUEST_GET_DESCRIPTOR),
HelenOS homepage, sources at GitHub