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tty/hvc_console: Add DTR/RTS callback to handle HUPCL control 

Introduce a new callback to explicitly handle the HUPCL termios control flag.
This prepares for a follow-up commit for the hvc_iucv device driver to
improve handling when to drop an established network connection.

The callback naming is based on the recently added tty_port interface to
facilitate a potential refactoring of the hvc_console to use tty_port
functions.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hendrik Brueckner 2013-07-02 17:07:14 +02:00 committed by Greg Kroah-Hartman
parent e84f54fc58
commit 33e745a192
2 changed files with 13 additions and 1 deletions
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11
drivers/tty/hvc/hvc_console.c
View File

@ -361,7 +361,12 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
tty->driver_data = NULL; tty->driver_data = NULL;
tty_port_put(&hp->port); tty_port_put(&hp->port);
printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc); printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
} } else
/* We are ready... raise DTR/RTS */
if (C_BAUD(tty))
if (hp->ops->dtr_rts)
hp->ops->dtr_rts(hp, 1);
/* Force wakeup of the polling thread */ /* Force wakeup of the polling thread */
hvc_kick(); hvc_kick();
@ -393,6 +398,10 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
/* We are done with the tty pointer now. */ /* We are done with the tty pointer now. */
tty_port_tty_set(&hp->port, NULL); tty_port_tty_set(&hp->port, NULL);
if (C_HUPCL(tty))
if (hp->ops->dtr_rts)
hp->ops->dtr_rts(hp, 0);
if (hp->ops->notifier_del) if (hp->ops->notifier_del)
hp->ops->notifier_del(hp, hp->data); hp->ops->notifier_del(hp, hp->data);

3
drivers/tty/hvc/hvc_console.h
View File

@ -75,6 +75,9 @@ struct hv_ops {
/* tiocmget/set implementation */ /* tiocmget/set implementation */
int (*tiocmget)(struct hvc_struct *hp); int (*tiocmget)(struct hvc_struct *hp);
int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear); int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
/* Callbacks to handle tty ports */
void (*dtr_rts)(struct hvc_struct *hp, int raise);
}; };
/* Register a vterm and a slot index for use as a console (console_init) */ /* Register a vterm and a slot index for use as a console (console_init) */