+struct serial_ops
+ {
+ char *name;
+ struct serial_ops *next;
+ int (*open) (struct serial *, const char *name);
+ void (*close) (struct serial *);
+ int (*readchar) (struct serial *, int timeout);
+ int (*write) (struct serial *, const char *str, int len);
+ /* Discard pending output */
+ int (*flush_output) (struct serial *);
+ /* Discard pending input */
+ int (*flush_input) (struct serial *);
+ int (*send_break) (struct serial *);
+ void (*go_raw) (struct serial *);
+ serial_ttystate (*get_tty_state) (struct serial *);
+ int (*set_tty_state) (struct serial *, serial_ttystate);
+ void (*print_tty_state) (struct serial *, serial_ttystate,
+ struct ui_file *);
+ int (*noflush_set_tty_state) (struct serial *, serial_ttystate,
+ serial_ttystate);
+ int (*setbaudrate) (struct serial *, int rate);
+ int (*setstopbits) (struct serial *, int num);
+ /* Wait for output to drain */
+ int (*drain_output) (struct serial *);
+ /* Change the serial device into/out of asynchronous mode, call
+ the specified function when ever there is something
+ interesting. */
+ void (*async) (struct serial *scb, int async_p);
+ };