ref: 8b6ec7da32b39b2f1af45b6f6dff4cc9e836d5ac dir: /sys/src/cmd/nusb/usbd/fns.h/
int attachdev(Port*); void detachdev(Port*); void work(void); Hub* newhub(char *, Dev*); void hname(char *); void checkidle(void);