From 2cb4ca0208722836e921d5ba780b09f29d4026b8 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Tue, 7 Aug 2012 21:47:50 +0200 Subject: [PATCH] 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 Acked-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_port.c | 22 +++++++++++++++++++++- include/linux/tty.h | 2 ++ 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index c2f0592bcb2c..96302f4c7079 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -33,6 +33,26 @@ void tty_port_init(struct tty_port *port) } 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 @@ -48,7 +68,7 @@ struct device *tty_port_register_device(struct tty_port *port, 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); diff --git a/include/linux/tty.h b/include/linux/tty.h index acca24bf06a7..69a787fdfa9c 100644 --- a/include/linux/tty.h +++ b/include/linux/tty.h @@ -497,6 +497,8 @@ 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 void tty_port_link_device(struct tty_port *port, + struct tty_driver *driver, unsigned index); extern struct device *tty_port_register_device(struct tty_port *port, struct tty_driver *driver, unsigned index, struct device *device); -- 2.39.5