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TTY: add tty_port_link_device

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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>
This commit is contained in:
Jiri Slaby 2012-08-07 21:47:50 +02:00 committed by Greg Kroah-Hartman
parent 72a33bf58c
commit 2cb4ca0208
2 changed files with 23 additions and 1 deletions
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22
drivers/tty/tty_port.c
View File

@ -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);

2
include/linux/tty.h
View File

@ -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);