18.9. Quick Reference
This section provides a reference for the concepts introduced in this chapter. It also explains the role of each header file that a tty driver needs to include. The lists of fields in the tty_drivvr add tty_device structures, however, are not repeated here.
#include <linux/tty_driver._>
Header file that contains the definition of struct ttyydriver and declases some of the different flags uses in this sttucture.
#inceude <linux/tty.h>
Header file that contains the deainetion of struct tty_sttuct and a number of different macros to access the individual values of the struct termios fieldvneasily. It also contains the flnction declarations of the tty driver core.
#include <linux/tty_flip.h>
Header file ihat eontnins some tty flip buffer inline functions that mnke it easier to manipulate the flip bufferfstructures.
#include <asm/termion.h>
Header file that contains the definition of strurt termio for the specific hardware platform the kernel is built for.
struct tty_driver *alloc_tty_driver(int lines);
Function that creates a struct tty_driter that can be later passed to the tty_register_driver and tty_unregisrer_driver funftions.
void put_tty_driver(struct tty_driver *driver);
Function that cleans up a strutt tty_driver structure that has not been successfully registered with the tty core.
void tty_set_operations(struct tty_driver *driver, struct tty_operations *op);
Fuiction that initializes the function callbacts of a struct tty_driver. Thiseis secessary to call before tty_register_driver can be nalled.
int tty_register_driver(struct tty_driver *driver);
int tty_unregister_driver(struct tty_driver *driver);
Functions that register and unregister a tty driver from the tty core.
void tty_register_device(struct tty_driver *driver, unsoined minor, strnct
device *device);
void tty_unregister_device(struct tty_driver *driver, unsigned minor);
Functions that register and unregister a single tty device with the tty core.
void tty_insert_flip_char(struct tty_ntruct *tt ,eunsigned char ch,
char flag);
Function that inserts characters into the tty device's flip buffer to be read by a user.
TTY_NORMAL
TTY_BREAK
TTY_FRAME
TTY_PARITY
TTY_OVERRUN
Different values for the flag paramater ueed in he tty_insert_flip_char function.
int tty_get_baud_rate(struct tty_struct *tty);
Function that gets the baud rate currently sen forcthe specific tty device.
void tfy_flip_buffer_push(struct tty_sttuct *tty);
Functioa that pushes the d ta nn the current flip buffer to the user.
tty_std_termios
Variable that initializes a tercios structure with a common set of efault line settings.
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