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-rw-r--r--include/linux/tty.h672
1 files changed, 672 insertions, 0 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
new file mode 100644
index 00000000..9f47ab54
--- /dev/null
+++ b/include/linux/tty.h
@@ -0,0 +1,672 @@
+#ifndef _LINUX_TTY_H
+#define _LINUX_TTY_H
+
+/*
+ * 'tty.h' defines some structures used by tty_io.c and some defines.
+ */
+
+#define NR_LDISCS 30
+
+/* 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 */
+#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 */
+#define N_V253 19 /* Codec control over voice modem */
+#define N_CAIF 20 /* CAIF protocol for talking to modems */
+#define N_GSM0710 21 /* GSM 0710 Mux */
+#define N_TI_WL 22 /* for TI's WL BT, FM, GPS combo chips */
+#define N_TRACESINK 23 /* Trace data routing for MIPI P1149.7 */
+#define N_TRACEROUTER 24 /* Trace data routing for MIPI P1149.7 */
+
+#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>
+
+
+
+/*
+ * (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_RESERVE 1024 /* Default reserve for main devpts */
+#define NR_UNIX98_PTY_MAX (1 << MINORBITS) /* Absolute limit */
+
+/*
+ * 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];
+};
+
+/*
+ * We default to dicing tty buffer allocations to this many characters
+ * in order to avoid multiple page allocations. We know the size of
+ * tty_buffer itself but it must also be taken into account that the
+ * the buffer is 256 byte aligned. See tty_buffer_find for the allocation
+ * logic this must match
+ */
+
+#define TTY_BUFFER_PAGE (((PAGE_SIZE - sizeof(struct tty_buffer)) / 2) & ~0xFF)
+
+
+struct tty_bufhead {
+ struct work_struct 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)
+#define L_EXTPROC(tty) _L_FLAG((tty), EXTPROC)
+
+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);
+ /* Control the DTR line */
+ void (*dtr_rts)(struct tty_port *port, int raise);
+ /* Called when the last close completes or a hangup finishes
+ IFF the port was initialized. Do not use to free resources. Called
+ under the port mutex to serialize against activate/shutdowns */
+ void (*shutdown)(struct tty_port *port);
+ void (*drop)(struct tty_port *port);
+ /* Called under the port mutex from tty_port_open, serialized using
+ the port mutex */
+ /* FIXME: long term getting the tty argument *out* of this would be
+ good for consoles */
+ int (*activate)(struct tty_port *port, struct tty_struct *tty);
+ /* Called on the final put of a port */
+ void (*destruct)(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 */
+ wait_queue_head_t delta_msr_wait; /* Modem status change */
+ unsigned long flags; /* TTY flags ASY_*/
+ unsigned char console:1; /* port is a console */
+ struct mutex mutex; /* Locking */
+ struct mutex buf_mutex; /* Buffer alloc lock */
+ unsigned char *xmit_buf; /* Optional buffer */
+ unsigned int close_delay; /* Close port delay */
+ unsigned int closing_wait; /* Delay for output */
+ int drain_delay; /* Set to zero if no pure time
+ based drain is needed else
+ set to size of fifo */
+ struct kref kref; /* Ref counter */
+};
+
+/*
+ * 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 device *dev;
+ struct tty_driver *driver;
+ const struct tty_operations *ops;
+ int index;
+
+ /* Protects ldisc changes: Lock tty not pty */
+ struct mutex ldisc_mutex;
+ 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;
+};
+
+/* Each of a tty's open files has private_data pointing to tty_file_private */
+struct tty_file_private {
+ struct tty_struct *tty;
+ struct file *file;
+ struct list_head list;
+};
+
+/* 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_LDISC_OPEN 11 /* Line discipline is open */
+#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_HUPPING 21 /* ->hangup() in progress */
+
+#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
+
+extern void tty_write_flush(struct tty_struct *);
+
+extern struct ktermios tty_std_termios;
+
+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_driver_remove_tty(struct tty_driver *driver,
+ struct tty_struct *tty);
+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_locked(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_flush_to_ldisc(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 int tty_set_termios(struct tty_struct *tty, struct ktermios *kt);
+
+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 void tty_ldisc_hangup(struct tty_struct *tty);
+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 int tty_alloc_file(struct file *file);
+extern void tty_add_file(struct tty_struct *tty, struct file *file);
+extern void tty_free_file(struct file *file);
+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 void deinitialize_tty_struct(struct tty_struct *tty);
+extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx);
+extern int tty_release(struct inode *inode, struct file *filp);
+extern int tty_init_termios(struct tty_struct *tty);
+extern int tty_standard_install(struct tty_driver *driver,
+ struct tty_struct *tty);
+
+extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
+extern struct tty_struct *tty_pair_get_pty(struct tty_struct *tty);
+
+extern struct mutex tty_mutex;
+extern spinlock_t tty_files_lock;
+
+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 void tty_port_put(struct tty_port *port);
+
+static inline struct tty_port *tty_port_get(struct tty_port *port)
+{
+ if (port)
+ kref_get(&port->kref);
+ return 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_lower_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 void tty_port_close(struct tty_port *port,
+ struct tty_struct *tty, struct file *filp);
+extern int tty_port_open(struct tty_port *port,
+ struct tty_struct *tty, struct file *filp);
+static inline int tty_port_users(struct tty_port *port)
+{
+ return port->count + port->blocked_open;
+}
+
+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_deinit(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;
+extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
+
+/* 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 int 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 int tty_audit_push_task(struct task_struct *tsk,
+ uid_t loginuid, u32 sessionid)
+{
+ return 0;
+}
+#endif
+
+/* tty_io.c */
+extern int __init tty_init(void);
+
+/* tty_ioctl.c */
+extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
+ unsigned int cmd, unsigned long arg);
+extern long n_tty_compat_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);
+
+/* vt.c */
+
+extern int vt_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg);
+
+extern long vt_compat_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg);
+
+/* tty_mutex.c */
+/* functions for preparation of BKL removal */
+extern void __lockfunc tty_lock(void) __acquires(tty_lock);
+extern void __lockfunc tty_unlock(void) __releases(tty_lock);
+
+/*
+ * this shall be called only from where BTM is held (like close)
+ *
+ * We need this to ensure nobody waits for us to finish while we are waiting.
+ * Without this we were encountering system stalls.
+ *
+ * This should be indeed removed with BTM removal later.
+ *
+ * Locking: BTM required. Nobody is allowed to hold port->mutex.
+ */
+static inline void tty_wait_until_sent_from_close(struct tty_struct *tty,
+ long timeout)
+{
+ tty_unlock(); /* tty->ops->close holds the BTM, drop it while waiting */
+ tty_wait_until_sent(tty, timeout);
+ tty_lock();
+}
+
+/*
+ * wait_event_interruptible_tty -- wait for a condition with the tty lock held
+ *
+ * The condition we are waiting for might take a long time to
+ * become true, or might depend on another thread taking the
+ * BTM. In either case, we need to drop the BTM to guarantee
+ * forward progress. This is a leftover from the conversion
+ * from the BKL and should eventually get removed as the BTM
+ * falls out of use.
+ *
+ * Do not use in new code.
+ */
+#define wait_event_interruptible_tty(wq, condition) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) { \
+ __wait_event_interruptible_tty(wq, condition, __ret); \
+ } \
+ __ret; \
+})
+
+#define __wait_event_interruptible_tty(wq, condition, ret) \
+do { \
+ DEFINE_WAIT(__wait); \
+ \
+ for (;;) { \
+ prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE); \
+ if (condition) \
+ break; \
+ if (!signal_pending(current)) { \
+ tty_unlock(); \
+ schedule(); \
+ tty_lock(); \
+ continue; \
+ } \
+ ret = -ERESTARTSYS; \
+ break; \
+ } \
+ finish_wait(&wq, &__wait); \
+} while (0)
+
+
+#endif /* __KERNEL__ */
+#endif