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#ifndef _LINUX_TTY_H

#define _LINUX_TTY_H

/*

 * 'tty.h' defines some structures used by tty_io.c and some defines.

 */

#ifdef __KERNEL__

#include <linux/fs.h>

#include <linux/major.h>

#include <linux/termios.h>

#include <linux/workqueue.h>

#include <linux/tty_driver.h>

#include <linux/tty_ldisc.h>

#include <linux/mutex.h>

#include <asm/system.h>

/*

 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are

 * hardcoded at present.)

 */

#define NR_UNIX98_PTY_DEFAULT   4096      /* Default maximum for Unix98 ptys */

#define NR_UNIX98_PTY_MAX       (1 << MINORBITS) /* Absolute limit */

#define NR_LDISCS               17

/* line disciplines */

#define N_TTY           0

#define N_SLIP          1

#define N_MOUSE         2

#define N_PPP           3

#define N_STRIP         4

#define N_AX25          5

#define N_X25           6       /* X.25 async */

#define N_6PACK         7

#define N_MASC          8       /* Reserved for Mobitex module <kaz@cafe.net> */

#define N_R3964         9       /* Reserved for Simatic R3964 module */

#define N_PROFIBUS_FDL  10      /* Reserved for Profibus <Dave@mvhi.com> */

#define N_IRDA          11      /* Linux IrDa - http://irda.sourceforge.net/ */

#define N_SMSBLOCK      12      /* SMS block mode - for talking to GSM data */

                                /* cards about SMS messages */

#define N_HDLC          13      /* synchronous HDLC */

#define N_SYNC_PPP      14      /* synchronous PPP */

#define N_HCI           15      /* Bluetooth HCI UART */

#define N_GIGASET_M101  16      /* Siemens Gigaset M101 serial DECT adapter */

/*

 * This character is the same as _POSIX_VDISABLE: it cannot be used as

 * a c_cc[] character, but indicates that a particular special character

 * isn't in use (eg VINTR has no character etc)

 */

#define __DISABLED_CHAR '\0'

/*

 * This is the flip buffer used for the tty driver.  The buffer is

 * located in the tty structure, and is used as a high speed interface

 * between the tty driver and the tty line discipline.

 */

#define TTY_FLIPBUF_SIZE 512

struct tty_buffer {

        struct tty_buffer *next;

        char *char_buf_ptr;

        unsigned char *flag_buf_ptr;

        int used;

        int size;

        int commit;

        int read;

        /* Data points here */

        unsigned long data[0];

};

struct tty_bufhead {

        struct delayed_work work;

        struct semaphore pty_sem;

        spinlock_t lock;

        struct tty_buffer *head;        /* Queue head */

        struct tty_buffer *tail;        /* Active buffer */

        struct tty_buffer *free;        /* Free queue head */

        int memory_used;                /* Buffer space used excluding free queue */

};

/*

 * When a break, frame error, or parity error happens, these codes are

 * stuffed into the flags buffer.

 */

#define TTY_NORMAL      0

#define TTY_BREAK       1

#define TTY_FRAME       2

#define TTY_PARITY      3

#define TTY_OVERRUN     4

#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])

#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])

#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])

#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])

#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])

#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])

#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])

#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])

#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])

#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])

#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])

#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])

#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])

#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])

#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])

#define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])

#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])

#define _I_FLAG(tty,f)  ((tty)->termios->c_iflag & (f))

#define _O_FLAG(tty,f)  ((tty)->termios->c_oflag & (f))

#define _C_FLAG(tty,f)  ((tty)->termios->c_cflag & (f))

#define _L_FLAG(tty,f)  ((tty)->termios->c_lflag & (f))

#define I_IGNBRK(tty)   _I_FLAG((tty),IGNBRK)

#define I_BRKINT(tty)   _I_FLAG((tty),BRKINT)

#define I_IGNPAR(tty)   _I_FLAG((tty),IGNPAR)

#define I_PARMRK(tty)   _I_FLAG((tty),PARMRK)

#define I_INPCK(tty)    _I_FLAG((tty),INPCK)

#define I_ISTRIP(tty)   _I_FLAG((tty),ISTRIP)

#define I_INLCR(tty)    _I_FLAG((tty),INLCR)

#define I_IGNCR(tty)    _I_FLAG((tty),IGNCR)

#define I_ICRNL(tty)    _I_FLAG((tty),ICRNL)

#define I_IUCLC(tty)    _I_FLAG((tty),IUCLC)

#define I_IXON(tty)     _I_FLAG((tty),IXON)

#define I_IXANY(tty)    _I_FLAG((tty),IXANY)

#define I_IXOFF(tty)    _I_FLAG((tty),IXOFF)

#define I_IMAXBEL(tty)  _I_FLAG((tty),IMAXBEL)

#define I_IUTF8(tty)    _I_FLAG((tty),IUTF8)

#define O_OPOST(tty)    _O_FLAG((tty),OPOST)

#define O_OLCUC(tty)    _O_FLAG((tty),OLCUC)

#define O_ONLCR(tty)    _O_FLAG((tty),ONLCR)

#define O_OCRNL(tty)    _O_FLAG((tty),OCRNL)

#define O_ONOCR(tty)    _O_FLAG((tty),ONOCR)

#define O_ONLRET(tty)   _O_FLAG((tty),ONLRET)

#define O_OFILL(tty)    _O_FLAG((tty),OFILL)

#define O_OFDEL(tty)    _O_FLAG((tty),OFDEL)

#define O_NLDLY(tty)    _O_FLAG((tty),NLDLY)

#define O_CRDLY(tty)    _O_FLAG((tty),CRDLY)

#define O_TABDLY(tty)   _O_FLAG((tty),TABDLY)

#define O_BSDLY(tty)    _O_FLAG((tty),BSDLY)

#define O_VTDLY(tty)    _O_FLAG((tty),VTDLY)

#define O_FFDLY(tty)    _O_FLAG((tty),FFDLY)

#define C_BAUD(tty)     _C_FLAG((tty),CBAUD)

#define C_CSIZE(tty)    _C_FLAG((tty),CSIZE)

#define C_CSTOPB(tty)   _C_FLAG((tty),CSTOPB)

#define C_CREAD(tty)    _C_FLAG((tty),CREAD)

#define C_PARENB(tty)   _C_FLAG((tty),PARENB)

#define C_PARODD(tty)   _C_FLAG((tty),PARODD)

#define C_HUPCL(tty)    _C_FLAG((tty),HUPCL)

#define C_CLOCAL(tty)   _C_FLAG((tty),CLOCAL)

#define C_CIBAUD(tty)   _C_FLAG((tty),CIBAUD)

#define C_CRTSCTS(tty)  _C_FLAG((tty),CRTSCTS)

#define L_ISIG(tty)     _L_FLAG((tty),ISIG)

#define L_ICANON(tty)   _L_FLAG((tty),ICANON)

#define L_XCASE(tty)    _L_FLAG((tty),XCASE)

#define L_ECHO(tty)     _L_FLAG((tty),ECHO)

#define L_ECHOE(tty)    _L_FLAG((tty),ECHOE)

#define L_ECHOK(tty)    _L_FLAG((tty),ECHOK)

#define L_ECHONL(tty)   _L_FLAG((tty),ECHONL)

#define L_NOFLSH(tty)   _L_FLAG((tty),NOFLSH)

#define L_TOSTOP(tty)   _L_FLAG((tty),TOSTOP)

#define L_ECHOCTL(tty)  _L_FLAG((tty),ECHOCTL)

#define L_ECHOPRT(tty)  _L_FLAG((tty),ECHOPRT)

#define L_ECHOKE(tty)   _L_FLAG((tty),ECHOKE)

#define L_FLUSHO(tty)   _L_FLAG((tty),FLUSHO)

#define L_PENDIN(tty)   _L_FLAG((tty),PENDIN)

#define L_IEXTEN(tty)   _L_FLAG((tty),IEXTEN)

struct device;

struct signal_struct;

/*

 * Where all of the state associated with a tty is kept while the tty

 * is open.  Since the termios state should be kept even if the tty

 * has been closed --- for things like the baud rate, etc --- it is

 * not stored here, but rather a pointer to the real state is stored

 * here.  Possible the winsize structure should have the same

 * treatment, but (1) the default 80x24 is usually right and (2) it's

 * most often used by a windowing system, which will set the correct

 * size each time the window is created or resized anyway.

 *                                              - TYT, 9/14/92

 */

struct tty_struct {

        int     magic;

        struct tty_driver *driver;

        int index;

        struct tty_ldisc ldisc;

        struct mutex termios_mutex;

        struct ktermios *termios, *termios_locked;

        char name[64];

        struct pid *pgrp;

        struct pid *session;

        unsigned long flags;

        int count;

        struct winsize winsize;

        unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;

        unsigned char low_latency:1, warned:1;

        unsigned char ctrl_status;

        unsigned int receive_room;      /* Bytes free for queue */

        struct tty_struct *link;

        struct fasync_struct *fasync;

        struct tty_bufhead buf;

        int alt_speed;          /* For magic substitution of 38400 bps */

        wait_queue_head_t write_wait;

        wait_queue_head_t read_wait;

        struct work_struct hangup_work;

        void *disc_data;

        void *driver_data;

        struct list_head tty_files;

#define N_TTY_BUF_SIZE 4096

        /*

         * The following is data for the N_TTY line discipline.  For

         * historical reasons, this is included in the tty structure.

         */

        unsigned int column;

        unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;

        unsigned char closing:1;

        unsigned short minimum_to_wake;

        unsigned long overrun_time;

        int num_overrun;

        unsigned long process_char_map[256/(8*sizeof(unsigned long))];

        char *read_buf;

        int read_head;

        int read_tail;

        int read_cnt;

        unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];

        int canon_data;

        unsigned long canon_head;

        unsigned int canon_column;

        struct mutex atomic_read_lock;

        struct mutex atomic_write_lock;

        unsigned char *write_buf;

        int write_cnt;

        spinlock_t read_lock;

        /* If the tty has a pending do_SAK, queue it here - akpm */

        struct work_struct SAK_work;

};

/* tty magic number */

#define TTY_MAGIC               0x5401

/*

 * These bits are used in the flags field of the tty structure.

 *

 * So that interrupts won't be able to mess up the queues,

 * copy_to_cooked must be atomic with respect to itself, as must

 * tty->write.  Thus, you must use the inline functions set_bit() and

 * clear_bit() to make things atomic.

 */

#define TTY_THROTTLED           0        /* Call unthrottle() at threshold min */

#define TTY_IO_ERROR            1       /* Canse an I/O error (may be no ldisc too) */

#define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */

#define TTY_EXCLUSIVE           3       /* Exclusive open mode */

#define TTY_DEBUG               4       /* Debugging */

#define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */

#define TTY_PUSH                6       /* n_tty private */

#define TTY_CLOSING             7       /* ->close() in progress */

#define TTY_LDISC               9       /* Line discipline attached */

#define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */

#define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */

#define TTY_PTY_LOCK            16      /* pty private */

#define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */

#define TTY_HUPPED              18      /* Post driver->hangup() */

#define TTY_FLUSHING            19      /* Flushing to ldisc in progress */

#define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */

#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))

extern void tty_write_flush(struct tty_struct *);

extern struct ktermios tty_std_termios;

extern int kmsg_redirect;

extern void console_init(void);

extern int vcs_init(void);

extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,

                              const char *routine);

extern char *tty_name(struct tty_struct *tty, char *buf);

extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);

extern int tty_check_change(struct tty_struct * tty);

extern void stop_tty(struct tty_struct * tty);

extern void start_tty(struct tty_struct * tty);

extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);

extern int tty_unregister_ldisc(int disc);

extern int tty_register_driver(struct tty_driver *driver);

extern int tty_unregister_driver(struct tty_driver *driver);

extern struct device *tty_register_device(struct tty_driver *driver,

                                          unsigned index, struct device *dev);

extern void tty_unregister_device(struct tty_driver *driver, unsigned index);

extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,

                             int buflen);

extern void tty_write_message(struct tty_struct *tty, char *msg);

extern int is_current_pgrp_orphaned(void);

extern int is_ignored(int sig);

extern int tty_signal(int sig, struct tty_struct *tty);

extern void tty_hangup(struct tty_struct * tty);

extern void tty_vhangup(struct tty_struct * tty);

extern void tty_unhangup(struct file *filp);

extern int tty_hung_up_p(struct file * filp);

extern int is_tty(struct file *filp);

extern void do_SAK(struct tty_struct *tty);

extern void __do_SAK(struct tty_struct *tty);

extern void disassociate_ctty(int priv);

extern void no_tty(void);

extern void tty_flip_buffer_push(struct tty_struct *tty);

extern speed_t tty_get_baud_rate(struct tty_struct *tty);

extern speed_t tty_termios_baud_rate(struct ktermios *termios);

extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);

extern void tty_termios_encode_baud_rate(struct ktermios *termios, speed_t ibaud, speed_t obaud);

extern void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud);

extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);

extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);

extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);

extern void tty_ldisc_deref(struct tty_ldisc *);

extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);

extern struct tty_ldisc *tty_ldisc_get(int);

extern void tty_ldisc_put(int);

extern void tty_wakeup(struct tty_struct *tty);

extern void tty_ldisc_flush(struct tty_struct *tty);

extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd,

                     unsigned long arg);

extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,

                        unsigned int cmd, unsigned long arg);

extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);

extern dev_t tty_devnum(struct tty_struct *tty);

extern void proc_clear_tty(struct task_struct *p);

extern struct tty_struct *get_current_tty(void);

extern struct mutex tty_mutex;

extern void tty_write_unlock(struct tty_struct *tty);

extern int tty_write_lock(struct tty_struct *tty, int ndelay);

#define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))

/* n_tty.c */

extern struct tty_ldisc tty_ldisc_N_TTY;

/* tty_audit.c */

#ifdef CONFIG_AUDIT

extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,

                               size_t size);

extern void tty_audit_exit(void);

extern void tty_audit_fork(struct signal_struct *sig);

extern void tty_audit_push(struct tty_struct *tty);

extern void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid);

extern void tty_audit_opening(void);

#else

static inline void tty_audit_add_data(struct tty_struct *tty,

                                      unsigned char *data, size_t size)

{

}

static inline void tty_audit_exit(void)

{

}

static inline void tty_audit_fork(struct signal_struct *sig)

{

}

static inline void tty_audit_push(struct tty_struct *tty)

{

}

static inline void tty_audit_push_task(struct task_struct *tsk, uid_t loginuid)

{

}

static inline void tty_audit_opening(void)

{

}

#endif

/* tty_ioctl.c */

extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,

                       unsigned int cmd, unsigned long arg);

/* serial.c */

extern void serial_console_init(void);

/* pcxx.c */

extern int pcxe_open(struct tty_struct *tty, struct file *filp);

/* printk.c */

extern void console_print(const char *);

/* vt.c */

extern int vt_ioctl(struct tty_struct *tty, struct file * file,

                    unsigned int cmd, unsigned long arg);

#endif /* __KERNEL__ */

#endif