TTY: add tty_port_link_device
This is for those drivers which do not have dynamic device creation
(do not call tty_port_register_device) and do not want to implement
tty->ops->install (will not call tty_port_install). They still have to
provide the link somehow though.
And this newly added function is exactly to serve that purpose.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index c2f0592..96302f4 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -34,6 +34,26 @@
EXPORT_SYMBOL(tty_port_init);
/**
+ * tty_port_link_device - link tty and tty_port
+ * @port: tty_port of the device
+ * @driver: tty_driver for this device
+ * @index: index of the tty
+ *
+ * Provide the tty layer wit ha link from a tty (specified by @index) to a
+ * tty_port (@port). Use this only if neither tty_port_register_device nor
+ * tty_port_install is used in the driver. If used, this has to be called before
+ * tty_register_driver.
+ */
+void tty_port_link_device(struct tty_port *port,
+ struct tty_driver *driver, unsigned index)
+{
+ if (WARN_ON(index >= driver->num))
+ return;
+ driver->ports[index] = port;
+}
+EXPORT_SYMBOL_GPL(tty_port_link_device);
+
+/**
* tty_port_register_device - register tty device
* @port: tty_port of the device
* @driver: tty_driver for this device
@@ -48,7 +68,7 @@
struct tty_driver *driver, unsigned index,
struct device *device)
{
- driver->ports[index] = port;
+ tty_port_link_device(port, driver, index);
return tty_register_device(driver, index, device);
}
EXPORT_SYMBOL_GPL(tty_port_register_device);