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>
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@ -33,6 +33,26 @@ void tty_port_init(struct tty_port *port)
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}
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EXPORT_SYMBOL(tty_port_init);
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/**
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* tty_port_link_device - link tty and tty_port
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* @port: tty_port of the device
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* @driver: tty_driver for this device
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* @index: index of the tty
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*
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* Provide the tty layer wit ha link from a tty (specified by @index) to a
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* tty_port (@port). Use this only if neither tty_port_register_device nor
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* tty_port_install is used in the driver. If used, this has to be called before
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* tty_register_driver.
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*/
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void tty_port_link_device(struct tty_port *port,
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struct tty_driver *driver, unsigned index)
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{
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if (WARN_ON(index >= driver->num))
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return;
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driver->ports[index] = port;
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}
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EXPORT_SYMBOL_GPL(tty_port_link_device);
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/**
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* tty_port_register_device - register tty device
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* @port: tty_port of the device
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@ -48,7 +68,7 @@ struct device *tty_port_register_device(struct tty_port *port,
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struct tty_driver *driver, unsigned index,
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struct device *device)
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{
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driver->ports[index] = port;
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tty_port_link_device(port, driver, index);
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return tty_register_device(driver, index, device);
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}
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EXPORT_SYMBOL_GPL(tty_port_register_device);
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@ -497,6 +497,8 @@ extern int tty_write_lock(struct tty_struct *tty, int ndelay);
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#define tty_is_writelocked(tty) (mutex_is_locked(&tty->atomic_write_lock))
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extern void tty_port_init(struct tty_port *port);
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extern void tty_port_link_device(struct tty_port *port,
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struct tty_driver *driver, unsigned index);
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extern struct device *tty_port_register_device(struct tty_port *port,
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struct tty_driver *driver, unsigned index,
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struct device *device);
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