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Diffstat (limited to 'include/linux/tty.h')
-rw-r--r--include/linux/tty.h25
1 files changed, 23 insertions, 2 deletions
diff --git a/include/linux/tty.h b/include/linux/tty.h
index f0f43d08d8b8..405a9035fe40 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -190,9 +190,17 @@ struct tty_port_operations {
/* 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 */
+ 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 {
@@ -206,12 +214,14 @@ struct tty_port {
wait_queue_head_t delta_msr_wait; /* Modem status change */
unsigned long flags; /* TTY flags ASY_*/
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 */
};
/*
@@ -439,7 +449,7 @@ extern void initialize_tty_struct(struct tty_struct *tty,
struct tty_driver *driver, int idx);
extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
int first_ok);
-extern void tty_release_dev(struct file *filp);
+extern int tty_release(struct inode *inode, struct file *filp);
extern int tty_init_termios(struct tty_struct *tty);
extern struct tty_struct *tty_pair_get_tty(struct tty_struct *tty);
@@ -454,6 +464,15 @@ extern int tty_write_lock(struct tty_struct *tty, int ndelay);
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);
+
+extern 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);
@@ -467,6 +486,8 @@ extern int tty_port_close_start(struct tty_port *port,
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);
extern inline int tty_port_users(struct tty_port *port)
{
return port->count + port->blocked_open;