tty: Clean up the tty_init_dev changes further

Fix up the naming, style and extract some bits of code into the driver
specific code

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

1 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 2322313a8589..2c5c35c4656f 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -7,6 +7,14 @@
  * defined; unless noted otherwise, they are optional, and can be
  * filled in with a null pointer.
  *
+ * struct tty_struct * (*lookup)(struct tty_driver *self, int idx)
+ *
+ *      Return the tty device corresponding to idx, NULL if there is not
+ *      one currently in use and an ERR_PTR value on error. Called under
+ *      tty_mutex (for now!)
+ *
+ *      Optional method. Default behaviour is to use the ttys array
+ *
  * int  (*open)(struct tty_struct * tty, struct file * filp);
  *
  *      This routine is called when a particular tty device is opened.
@@ -203,6 +211,7 @@ struct tty_struct;
 struct tty_driver;
 
 struct tty_operations {
+        struct tty_struct * (*lookup)(struct tty_driver *driver, int idx);
         int  (*open)(struct tty_struct * tty, struct file * filp);
         void (*close)(struct tty_struct * tty, struct file * filp);
         void (*shutdown)(struct tty_struct *tty);