250 struct tty_driver;
254 	struct tty_struct * (*lookup)(struct tty_driver *driver,
256 	int  (*install)(struct tty_driver *driver, struct tty_struct *tty);
257 	void (*remove)(struct tty_driver *driver, struct tty_struct *tty);
292 	int (*poll_init)(struct tty_driver *driver, int line, char *options);
293 	int (*poll_get_char)(struct tty_driver *driver, int line);
294 	void (*poll_put_char)(struct tty_driver *driver, int line, char ch);
299 struct tty_driver {  struct
315 	struct tty_driver *other; /* only used for the PTY driver */  argument
335 extern struct tty_driver *__tty_alloc_driver(unsigned int lines,  argument
337 extern void put_tty_driver(struct tty_driver *driver);
338 extern void tty_set_operations(struct tty_driver *driver,
340 extern struct tty_driver *tty_find_polling_driver(char *name, int *line);
342 extern void tty_driver_kref_put(struct tty_driver *driver);
352 static inline struct tty_driver *alloc_tty_driver(unsigned int lines)  in alloc_tty_driver()
354 	struct tty_driver *ret = tty_alloc_driver(lines, 0);  in alloc_tty_driver()
360 static inline struct tty_driver *tty_driver_kref_get(struct tty_driver *d)  in tty_driver_kref_get()