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Diffstat (limited to 'include/linux/tty_driver.h')
| -rw-r--r-- | include/linux/tty_driver.h | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h new file mode 100644 index 000000000000..b368b296d035 --- /dev/null +++ b/include/linux/tty_driver.h @@ -0,0 +1,279 @@ +#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 termios * 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 termios * 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 *devfs_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 termios 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 termios **termios; + struct termios **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 termios * 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, 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_NO_DEVFS --- if set, do not create devfs entries. This + * is only used by tty_register_driver(). + * + * 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_NO_DEVFS 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 */ |