tty: Ldisc revamp

[linux-2.6-omap-h63xx.git] / include / linux / tty.h

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 265831ccaa88de67be83e2dfcbaa5da4a5d71247..013711ea7385fa09f4b53ed338a2e2463a47eb8e 100644 (file)
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -36,7 +36,7 @@
 #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_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 */
@@ -177,27 +177,34 @@ struct signal_struct;
  * size each time the window is created or resized anyway.
  *                                             - TYT, 9/14/92
  */
+
+struct tty_operations;
+
 struct tty_struct {
        int     magic;
        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;
        char name[64];
-       struct pid *pgrp;
+       struct pid *pgrp;               /* Protected by ctrl lock */
        struct pid *session;
        unsigned long flags;
        int count;
-       struct winsize winsize;
+       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;
+       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;
+       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;
@@ -211,6 +218,7 @@ struct tty_struct {
        /*
         * 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;
@@ -282,7 +290,7 @@ 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_register_ldisc(int disc, struct tty_ldisc_ops *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);
@@ -292,8 +300,15 @@ 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 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);
@@ -316,15 +331,12 @@ 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);
 
-extern int tty_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-                    unsigned long arg);
+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);
@@ -341,7 +353,7 @@ extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 
 
 /* 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