tty: Introduce a tty_port common structure

Every tty driver has its own concept of a port structure and because
they all differ we cannot extract commonality.  Begin fixing this by
creating a structure drivers can elect to use so that over time we can
push fields into this and create commonality and then introduce common
methods.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 29 insertions, 1 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 013711ea7385..d7c695b65c0e 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -166,6 +166,29 @@ struct tty_bufhead {
 
 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 */
+};
+
 /*
  * 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
@@ -214,7 +237,7 @@ 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.
@@ -242,6 +265,7 @@ 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 */
@@ -350,6 +374,10 @@ 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);
+
 
 
 /* n_tty.c */