ref: 0b12020f10a0ccf4543fc087dd2e9e0b2e8d56f8 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);