1 files changed, 127 insertions, 86 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 324a3b231d40..e3579cb086e0 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -71,7 +71,8 @@ struct tty_bufhead {
         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 */
+        int memory_used;                /* Buffer space used excluding
+                                                                free queue */
 };
 /*
  * When a break, frame error, or parity error happens, these codes are
@@ -101,71 +102,96 @@ struct tty_bufhead {
 #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 _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_struct       *tty;           /* Back pointer */
+        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
@@ -185,6 +211,7 @@ struct tty_struct {
         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;
@@ -213,7 +240,7 @@ struct tty_struct {
         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.
@@ -241,6 +268,7 @@ struct tty_struct {
         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 */
@@ -248,14 +276,14 @@ struct tty_struct {
 
 /*
  * 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_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 */
@@ -285,12 +313,10 @@ 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 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,
@@ -310,10 +336,10 @@ 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_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 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);
@@ -322,17 +348,17 @@ 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_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 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);
@@ -351,10 +377,23 @@ 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 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 tty_ldisc_N_TTY;
+extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 
 /* tty_audit.c */
 #ifdef CONFIG_AUDIT
@@ -363,7 +402,8 @@ extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 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, u32 sessionid);
+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)
@@ -378,19 +418,20 @@ 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)
+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(struct tty_struct * tty, struct file * file,
+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);
@@ -401,7 +442,7 @@ extern void console_print(const char *);
 
 /* vt.c */
 
-extern int vt_ioctl(struct tty_struct *tty, struct file * file,
+extern int vt_ioctl(struct tty_struct *tty, struct file *file,
                     unsigned int cmd, unsigned long arg);
 
 #endif /* __KERNEL__ */