From 33e745a192c272130b02b86d5dea5b577a291ed7 Mon Sep 17 00:00:00 2001
From: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Date: Tue, 2 Jul 2013 17:07:14 +0200
Subject: [PATCH] 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>
---
drivers/tty/hvc/hvc_console.c | 11 ++++++++++-
drivers/tty/hvc/hvc_console.h | 3 +++
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index eb255e807c06..9eba119bcdd3 100644
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -361,7 +361,12 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
tty->driver_data = NULL;
tty_port_put(&hp->port);
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 */
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. */
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)
hp->ops->notifier_del(hp, hp->data);
diff --git a/drivers/tty/hvc/hvc_console.h b/drivers/tty/hvc/hvc_console.h
index 674d23cb919a..913101980827 100644
--- a/drivers/tty/hvc/hvc_console.h
+++ b/drivers/tty/hvc/hvc_console.h
@@ -75,6 +75,9 @@ struct hv_ops {
/* tiocmget/set implementation */
int (*tiocmget)(struct hvc_struct *hp);
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) */
--
GitLab