9 void (*read) (struct serial_if *, void *, size_t);
10 void (*write) (struct serial_if *, const void *, size_t);
21 int serial_init(struct serial_if *sif);
22 void serial_read(struct serial_if *sif, void *data, size_t n);
23 void serial_write(struct serial_if *sif, const void *data, size_t n);