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Commit 2cb4ca02 authored by Jiri Slaby's avatar Jiri Slaby Committed by Greg Kroah-Hartman
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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: default avatarJiri Slaby <jslaby@suse.cz>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 72a33bf5

drivers/tty/tty_port.c

+21 −1
Original line number Diff line number Diff line
@@ -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);

include/linux/tty.h

+2 −0
Original line number Diff line number Diff line
@@ -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);