HelenOS sources

usb_device_get_speed  141 uspace/drv/bus/usb/usbhub/usbhub.c 	hub_dev->speed = usb_device_get_speed(usb_dev);
usb_device_get_speed   94 uspace/lib/usbdev/include/usb/dev/device.h usb_speed_t usb_device_get_speed(const usb_device_t *);
HelenOS homepage, sources at GitHub