ref: 3f5db0b7f757a6ccbfe2d22a8bab67d27dd9235c 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);