ref: d7d0dcfcc65fc4f8ab0b8c213469ecb91ea9f7e9 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);