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_driver and tty_device
structures, however, are not repeated here.- #include <linux/tty_driver.h>
Header file that contains the definition of struct
tty_driver and declares some of the different
flags used in this structure.
- #include <linux/tty.h>
Header file that contains the definition of struct
tty_struct and a number of different macros to
access the individual values of the struct
termios fields easily. It also contains the
function declarations of the tty driver core.
- #include <linux/tty_flip.h>
Header file that contains some tty flip buffer inline functions that
make it easier to manipulate the flip buffer structures.
- #include <asm/termios.h>
Header file that contains the definition of struct
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_driver that can be later passed to the
tty_register_driver and
tty_unregister_driver functions.
- void put_tty_driver(struct tty_driver *driver);
Function that cleans up a struct
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);
Function that initializes the function callbacks of a
struct tty_driver. This is
necessary to call before tty_register_driver can
be called.
- 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, unsigned minor, struct
- 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_struct *tty, unsigned 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 used in the
tty_insert_flip_char function.
- int tty_get_baud_rate(struct tty_struct *tty);
Function that gets the baud rate currently set for the specific tty
device.
- void tty_flip_buffer_push(struct tty_struct *tty);
Function that pushes the data in the current flip buffer to the user.
- tty_std_termios
Variable that initializes a termios structure with a common set of
default line settings.
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