287 lines
11 KiB
C
287 lines
11 KiB
C
#ifndef _LINUX_TTY_DRIVER_H
|
|
#define _LINUX_TTY_DRIVER_H
|
|
|
|
/*
|
|
* This structure defines the interface between the low-level tty
|
|
* driver and the tty routines. The following routines can be
|
|
* defined; unless noted otherwise, they are optional, and can be
|
|
* filled in with a null pointer.
|
|
*
|
|
* int (*open)(struct tty_struct * tty, struct file * filp);
|
|
*
|
|
* This routine is called when a particular tty device is opened.
|
|
* This routine is mandatory; if this routine is not filled in,
|
|
* the attempted open will fail with ENODEV.
|
|
*
|
|
* void (*close)(struct tty_struct * tty, struct file * filp);
|
|
*
|
|
* This routine is called when a particular tty device is closed.
|
|
*
|
|
* int (*write)(struct tty_struct * tty,
|
|
* const unsigned char *buf, int count);
|
|
*
|
|
* This routine is called by the kernel to write a series of
|
|
* characters to the tty device. The characters may come from
|
|
* user space or kernel space. This routine will return the
|
|
* number of characters actually accepted for writing. This
|
|
* routine is mandatory.
|
|
*
|
|
* void (*put_char)(struct tty_struct *tty, unsigned char ch);
|
|
*
|
|
* This routine is called by the kernel to write a single
|
|
* character to the tty device. If the kernel uses this routine,
|
|
* it must call the flush_chars() routine (if defined) when it is
|
|
* done stuffing characters into the driver. If there is no room
|
|
* in the queue, the character is ignored.
|
|
*
|
|
* void (*flush_chars)(struct tty_struct *tty);
|
|
*
|
|
* This routine is called by the kernel after it has written a
|
|
* series of characters to the tty device using put_char().
|
|
*
|
|
* int (*write_room)(struct tty_struct *tty);
|
|
*
|
|
* This routine returns the numbers of characters the tty driver
|
|
* will accept for queuing to be written. This number is subject
|
|
* to change as output buffers get emptied, or if the output flow
|
|
* control is acted.
|
|
*
|
|
* int (*ioctl)(struct tty_struct *tty, struct file * file,
|
|
* unsigned int cmd, unsigned long arg);
|
|
*
|
|
* This routine allows the tty driver to implement
|
|
* device-specific ioctl's. If the ioctl number passed in cmd
|
|
* is not recognized by the driver, it should return ENOIOCTLCMD.
|
|
*
|
|
* void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
|
|
*
|
|
* This routine allows the tty driver to be notified when
|
|
* device's termios settings have changed. Note that a
|
|
* well-designed tty driver should be prepared to accept the case
|
|
* where old == NULL, and try to do something rational.
|
|
*
|
|
* void (*set_ldisc)(struct tty_struct *tty);
|
|
*
|
|
* This routine allows the tty driver to be notified when the
|
|
* device's termios settings have changed.
|
|
*
|
|
* void (*throttle)(struct tty_struct * tty);
|
|
*
|
|
* This routine notifies the tty driver that input buffers for
|
|
* the line discipline are close to full, and it should somehow
|
|
* signal that no more characters should be sent to the tty.
|
|
*
|
|
* void (*unthrottle)(struct tty_struct * tty);
|
|
*
|
|
* This routine notifies the tty drivers that it should signals
|
|
* that characters can now be sent to the tty without fear of
|
|
* overrunning the input buffers of the line disciplines.
|
|
*
|
|
* void (*stop)(struct tty_struct *tty);
|
|
*
|
|
* This routine notifies the tty driver that it should stop
|
|
* outputting characters to the tty device.
|
|
*
|
|
* void (*start)(struct tty_struct *tty);
|
|
*
|
|
* This routine notifies the tty driver that it resume sending
|
|
* characters to the tty device.
|
|
*
|
|
* void (*hangup)(struct tty_struct *tty);
|
|
*
|
|
* This routine notifies the tty driver that it should hangup the
|
|
* tty device.
|
|
*
|
|
* void (*break_ctl)(struct tty_stuct *tty, int state);
|
|
*
|
|
* This optional routine requests the tty driver to turn on or
|
|
* off BREAK status on the RS-232 port. If state is -1,
|
|
* then the BREAK status should be turned on; if state is 0, then
|
|
* BREAK should be turned off.
|
|
*
|
|
* If this routine is implemented, the high-level tty driver will
|
|
* handle the following ioctls: TCSBRK, TCSBRKP, TIOCSBRK,
|
|
* TIOCCBRK. Otherwise, these ioctls will be passed down to the
|
|
* driver to handle.
|
|
*
|
|
* void (*wait_until_sent)(struct tty_struct *tty, int timeout);
|
|
*
|
|
* This routine waits until the device has written out all of the
|
|
* characters in its transmitter FIFO.
|
|
*
|
|
* void (*send_xchar)(struct tty_struct *tty, char ch);
|
|
*
|
|
* This routine is used to send a high-priority XON/XOFF
|
|
* character to the device.
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/list.h>
|
|
#include <linux/cdev.h>
|
|
|
|
struct tty_struct;
|
|
|
|
struct tty_operations {
|
|
int (*open)(struct tty_struct * tty, struct file * filp);
|
|
void (*close)(struct tty_struct * tty, struct file * filp);
|
|
int (*write)(struct tty_struct * tty,
|
|
const unsigned char *buf, int count);
|
|
void (*put_char)(struct tty_struct *tty, unsigned char ch);
|
|
void (*flush_chars)(struct tty_struct *tty);
|
|
int (*write_room)(struct tty_struct *tty);
|
|
int (*chars_in_buffer)(struct tty_struct *tty);
|
|
int (*ioctl)(struct tty_struct *tty, struct file * file,
|
|
unsigned int cmd, unsigned long arg);
|
|
void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
|
|
void (*throttle)(struct tty_struct * tty);
|
|
void (*unthrottle)(struct tty_struct * tty);
|
|
void (*stop)(struct tty_struct *tty);
|
|
void (*start)(struct tty_struct *tty);
|
|
void (*hangup)(struct tty_struct *tty);
|
|
void (*break_ctl)(struct tty_struct *tty, int state);
|
|
void (*flush_buffer)(struct tty_struct *tty);
|
|
void (*set_ldisc)(struct tty_struct *tty);
|
|
void (*wait_until_sent)(struct tty_struct *tty, int timeout);
|
|
void (*send_xchar)(struct tty_struct *tty, char ch);
|
|
int (*read_proc)(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data);
|
|
int (*write_proc)(struct file *file, const char __user *buffer,
|
|
unsigned long count, void *data);
|
|
int (*tiocmget)(struct tty_struct *tty, struct file *file);
|
|
int (*tiocmset)(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear);
|
|
};
|
|
|
|
struct tty_driver {
|
|
int magic; /* magic number for this structure */
|
|
struct cdev cdev;
|
|
struct module *owner;
|
|
const char *driver_name;
|
|
const char *name;
|
|
int name_base; /* offset of printed name */
|
|
int major; /* major device number */
|
|
int minor_start; /* start of minor device number */
|
|
int minor_num; /* number of *possible* devices */
|
|
int num; /* number of devices allocated */
|
|
short type; /* type of tty driver */
|
|
short subtype; /* subtype of tty driver */
|
|
struct ktermios init_termios; /* Initial termios */
|
|
int flags; /* tty driver flags */
|
|
int refcount; /* for loadable tty drivers */
|
|
struct proc_dir_entry *proc_entry; /* /proc fs entry */
|
|
struct tty_driver *other; /* only used for the PTY driver */
|
|
|
|
/*
|
|
* Pointer to the tty data structures
|
|
*/
|
|
struct tty_struct **ttys;
|
|
struct ktermios **termios;
|
|
struct ktermios **termios_locked;
|
|
void *driver_state; /* only used for the PTY driver */
|
|
|
|
/*
|
|
* Interface routines from the upper tty layer to the tty
|
|
* driver. Will be replaced with struct tty_operations.
|
|
*/
|
|
int (*open)(struct tty_struct * tty, struct file * filp);
|
|
void (*close)(struct tty_struct * tty, struct file * filp);
|
|
int (*write)(struct tty_struct * tty,
|
|
const unsigned char *buf, int count);
|
|
void (*put_char)(struct tty_struct *tty, unsigned char ch);
|
|
void (*flush_chars)(struct tty_struct *tty);
|
|
int (*write_room)(struct tty_struct *tty);
|
|
int (*chars_in_buffer)(struct tty_struct *tty);
|
|
int (*ioctl)(struct tty_struct *tty, struct file * file,
|
|
unsigned int cmd, unsigned long arg);
|
|
void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
|
|
void (*throttle)(struct tty_struct * tty);
|
|
void (*unthrottle)(struct tty_struct * tty);
|
|
void (*stop)(struct tty_struct *tty);
|
|
void (*start)(struct tty_struct *tty);
|
|
void (*hangup)(struct tty_struct *tty);
|
|
void (*break_ctl)(struct tty_struct *tty, int state);
|
|
void (*flush_buffer)(struct tty_struct *tty);
|
|
void (*set_ldisc)(struct tty_struct *tty);
|
|
void (*wait_until_sent)(struct tty_struct *tty, int timeout);
|
|
void (*send_xchar)(struct tty_struct *tty, char ch);
|
|
int (*read_proc)(char *page, char **start, off_t off,
|
|
int count, int *eof, void *data);
|
|
int (*write_proc)(struct file *file, const char __user *buffer,
|
|
unsigned long count, void *data);
|
|
int (*tiocmget)(struct tty_struct *tty, struct file *file);
|
|
int (*tiocmset)(struct tty_struct *tty, struct file *file,
|
|
unsigned int set, unsigned int clear);
|
|
|
|
struct list_head tty_drivers;
|
|
};
|
|
|
|
extern struct list_head tty_drivers;
|
|
|
|
struct tty_driver *alloc_tty_driver(int lines);
|
|
void put_tty_driver(struct tty_driver *driver);
|
|
void tty_set_operations(struct tty_driver *driver,
|
|
const struct tty_operations *op);
|
|
|
|
/* tty driver magic number */
|
|
#define TTY_DRIVER_MAGIC 0x5402
|
|
|
|
/*
|
|
* tty driver flags
|
|
*
|
|
* TTY_DRIVER_RESET_TERMIOS --- requests the tty layer to reset the
|
|
* termios setting when the last process has closed the device.
|
|
* Used for PTY's, in particular.
|
|
*
|
|
* TTY_DRIVER_REAL_RAW --- if set, indicates that the driver will
|
|
* guarantee never not to set any special character handling
|
|
* flags if ((IGNBRK || (!BRKINT && !PARMRK)) && (IGNPAR ||
|
|
* !INPCK)). That is, if there is no reason for the driver to
|
|
* send notifications of parity and break characters up to the
|
|
* line driver, it won't do so. This allows the line driver to
|
|
* optimize for this case if this flag is set. (Note that there
|
|
* is also a promise, if the above case is true, not to signal
|
|
* overruns, either.)
|
|
*
|
|
* TTY_DRIVER_DYNAMIC_DEV --- if set, the individual tty devices need
|
|
* to be registered with a call to tty_register_driver() when the
|
|
* device is found in the system and unregistered with a call to
|
|
* tty_unregister_device() so the devices will be show up
|
|
* properly in sysfs. If not set, driver->num entries will be
|
|
* created by the tty core in sysfs when tty_register_driver() is
|
|
* called. This is to be used by drivers that have tty devices
|
|
* that can appear and disappear while the main tty driver is
|
|
* registered with the tty core.
|
|
*
|
|
* TTY_DRIVER_DEVPTS_MEM -- don't use the standard arrays, instead
|
|
* use dynamic memory keyed through the devpts filesystem. This
|
|
* is only applicable to the pty driver.
|
|
*/
|
|
#define TTY_DRIVER_INSTALLED 0x0001
|
|
#define TTY_DRIVER_RESET_TERMIOS 0x0002
|
|
#define TTY_DRIVER_REAL_RAW 0x0004
|
|
#define TTY_DRIVER_DYNAMIC_DEV 0x0008
|
|
#define TTY_DRIVER_DEVPTS_MEM 0x0010
|
|
|
|
/* tty driver types */
|
|
#define TTY_DRIVER_TYPE_SYSTEM 0x0001
|
|
#define TTY_DRIVER_TYPE_CONSOLE 0x0002
|
|
#define TTY_DRIVER_TYPE_SERIAL 0x0003
|
|
#define TTY_DRIVER_TYPE_PTY 0x0004
|
|
#define TTY_DRIVER_TYPE_SCC 0x0005 /* scc driver */
|
|
#define TTY_DRIVER_TYPE_SYSCONS 0x0006
|
|
|
|
/* system subtypes (magic, used by tty_io.c) */
|
|
#define SYSTEM_TYPE_TTY 0x0001
|
|
#define SYSTEM_TYPE_CONSOLE 0x0002
|
|
#define SYSTEM_TYPE_SYSCONS 0x0003
|
|
#define SYSTEM_TYPE_SYSPTMX 0x0004
|
|
|
|
/* pty subtypes (magic, used by tty_io.c) */
|
|
#define PTY_TYPE_MASTER 0x0001
|
|
#define PTY_TYPE_SLAVE 0x0002
|
|
|
|
/* serial subtype definitions */
|
|
#define SERIAL_TYPE_NORMAL 1
|
|
|
|
#endif /* #ifdef _LINUX_TTY_DRIVER_H */
|