Linux 下串口驱动头文件之tty.h

linux-2.6.29/include/linux
#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  19/* 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 <[email protected]> */
#define N_R3964  9 /* Reserved for Simatic R3964 module */
#define N_PROFIBUS_FDL 10 /* Reserved for Profibus */
#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 */
#define N_SLCAN  17 /* Serial / USB serial CAN Adaptors */
#define N_PPS  18 /* Pulse per Second *//*
 * 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'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;
 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;/*
 * Port level information. Each device keeps its own port level information
 * so provide a common structure for those ports wanting to use common support
 * routines.
 *
 * The tty port has a different lifetime to the tty so must be kept apart.
 * In addition be careful as tty -> port mappings are valid for the life
 * of the tty object but in many cases port -> tty mappings are valid only
 * until a hangup so don't use the wrong path.
 */struct tty_port;
struct tty_port_operations {
 /* Return 1 if the carrier is raised */
 int (*carrier_raised)(struct tty_port *port);
 void (*raise_dtr_rts)(struct tty_port *port);
};
 
struct tty_port {
 struct tty_struct *tty;  /* Back pointer */
 const struct tty_port_operations *ops; /* Port operations */
 spinlock_t  lock;  /* Lock protecting tty field */
 int   blocked_open; /* Waiting to open */
 int   count;  /* Usage count */
 wait_queue_head_t open_wait; /* Open waiters */
 wait_queue_head_t close_wait; /* Close waiters */
 unsigned long  flags;  /* TTY flags ASY_*/
 struct mutex  mutex;  /* Locking */
 unsigned char  *xmit_buf; /* Optional buffer */
 int   close_delay; /* Close port delay */
 int   closing_wait; /* Delay for output */
};/*
 * 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_operations;
struct tty_struct {
 int magic;
 struct kref kref;
 struct tty_driver *driver;
 const struct tty_operations *ops;
 int index;
 /* The ldisc objects are protected by tty_ldisc_lock at the moment */
 struct tty_ldisc ldisc;
 struct mutex termios_mutex;
 spinlock_t ctrl_lock;
 /* Termios values are protected by the termios mutex */
 struct ktermios *termios, *termios_locked;
 struct termiox *termiox; /* May be NULL for unsupported */
 char name[64];
 struct pid *pgrp;  /* Protected by ctrl lock */
 struct pid *session;
 unsigned long flags;
 int count;
 struct winsize winsize;  /* termios mutex */
 unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 unsigned char low_latency:1, warned:1;
 unsigned char ctrl_status; /* ctrl_lock */
 unsigned int receive_room; /* Bytes free for queue */ struct tty_struct *link;
 struct fasync_struct *fasync;
 struct tty_bufhead buf;  /* Locked internally */
 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.
  * Mostly locked by the BKL.
  */
 unsigned int column;
 unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 unsigned char closing:1;
 unsigned char echo_overrun: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))];
 unsigned char *echo_buf;
 unsigned int echo_pos;
 unsigned int echo_cnt;
 int canon_data;
 unsigned long canon_head;
 unsigned int canon_column;
 struct mutex atomic_read_lock;
 struct mutex atomic_write_lock;
 struct mutex output_lock;
 struct mutex echo_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;
 struct tty_port *port;
};/* 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 /* Cause 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_LDISC_CHANGING  10 /* Line discipline changing */
#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 struct class *tty_class;
/**
 * tty_kref_get  - get a tty reference
 * @tty: tty device
 *
 * Return a new reference to a tty object. The caller must hold
 * sufficient locks/counts to ensure that their existing reference cannot
 * go away
 */static inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
{
 if (tty)
  kref_get(&tty->kref);
 return tty;
}
extern void tty_kref_put(struct tty_struct *tty);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_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 tty_put_char(struct tty_struct *tty, unsigned char c);
extern int tty_chars_in_buffer(struct tty_struct *tty);
extern int tty_write_room(struct tty_struct *tty);
extern void tty_driver_flush_buffer(struct tty_struct *tty);
extern void tty_throttle(struct tty_struct *tty);
extern void tty_unthrottle(struct tty_struct *tty);
extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
extern void tty_shutdown(struct tty_struct *tty);
extern void tty_free_termios(struct tty_struct *tty);
extern int is_current_pgrp_orphaned(void);
extern struct pid *tty_get_pgrp(struct tty_struct *tty);
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_vhangup_self(void);
extern void tty_unhangup(struct file *filp);
extern int tty_hung_up_p(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 void tty_buffer_free_all(struct tty_struct *tty);
extern void tty_buffer_flush(struct tty_struct *tty);
extern void tty_buffer_init(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 const struct file_operations tty_ldiscs_proc_fops;extern void tty_wakeup(struct tty_struct *tty);
extern void tty_ldisc_flush(struct tty_struct *tty);extern long tty_ioctl(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 void tty_default_fops(struct file_operations *fops);
extern struct tty_struct *alloc_tty_struct(void);
extern void free_tty_struct(struct tty_struct *tty);
extern void initialize_tty_struct(struct tty_struct *tty,
  struct tty_driver *driver, int idx);
extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
        int first_ok);
extern void tty_release_dev(struct file *filp);
extern int tty_init_termios(struct tty_struct *tty);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))extern void tty_port_init(struct tty_port *port);
extern int tty_port_alloc_xmit_buf(struct tty_port *port);
extern void tty_port_free_xmit_buf(struct tty_port *port);
extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
extern int tty_port_carrier_raised(struct tty_port *port);
extern void tty_port_raise_dtr_rts(struct tty_port *port);
extern void tty_port_hangup(struct tty_port *port);
extern int tty_port_block_til_ready(struct tty_port *port,
    struct tty_struct *tty, struct file *filp);
extern int tty_port_close_start(struct tty_port *port,
    struct tty_struct *tty, struct file *filp);
extern void tty_port_close_end(struct tty_port *port, struct tty_struct *tty);extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
extern int tty_unregister_ldisc(int disc);
extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
extern void tty_ldisc_init(struct tty_struct *tty);
extern void tty_ldisc_begin(void);
/* This last one is just for the tty layer internals and shouldn't be used elsewhere */
extern void tty_ldisc_enable(struct tty_struct *tty);/* n_tty.c */
extern struct tty_ldisc_ops 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_tiocsti(struct tty_struct *tty, char ch);
extern void tty_audit_push(struct tty_struct *tty);
extern void tty_audit_push_task(struct task_struct *tsk,
     uid_t loginuid, u32 sessionid);
#else
static inline void tty_audit_add_data(struct tty_struct *tty,
          unsigned char *data, size_t size)
{
}
static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
{
}
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, u32 sessionid)
{
}
#endif/* tty_ioctl.c */
extern int n_tty_ioctl_helper(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