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authorAlan Cox <alan@redhat.com>2009-01-02 13:45:05 +0000
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-02 10:19:38 -0800
commit31f35939d1d9bcfb3099b32c67b896d2792603f9 (patch)
tree39b6ceaf0e7477e0357ff8235814f579adad3f28 /drivers/char/tty_port.c
parentc9b3976e3fec266be25c5001a70aa0a890b6c476 (diff)
downloadlinux-31f35939d1d9bcfb3099b32c67b896d2792603f9.tar.bz2
tty_port: Add a port level carrier detect operation
This is the first step to generalising the various pieces of waiting logic duplicated in all sorts of serial drivers. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/tty_port.c')
-rw-r--r--drivers/char/tty_port.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index c8f8024cb40e..f54e40cbf023 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -94,3 +94,20 @@ void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty)
spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL(tty_port_tty_set);
+
+/**
+ * tty_port_carrier_raised - carrier raised check
+ * @port: tty port
+ *
+ * Wrapper for the carrier detect logic. For the moment this is used
+ * to hide some internal details. This will eventually become entirely
+ * internal to the tty port.
+ */
+
+int tty_port_carrier_raised(struct tty_port *port)
+{
+ if (port->ops->carrier_raised == NULL)
+ return 1;
+ return port->ops->carrier_raised(port);
+}
+EXPORT_SYMBOL(tty_port_carrier_raised);