Commit 0693196f authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman

USB: serial: add wait_until_sent operation

Add wait_until_sent operation which can be used to wait for hardware
buffers to drain.
Signed-off-by: default avatarJohan Hovold <jhovold@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 3b9561e9
......@@ -375,6 +375,22 @@ static int serial_chars_in_buffer(struct tty_struct *tty)
return count;
}
static void serial_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct usb_serial_port *port = tty->driver_data;
struct usb_serial *serial = port->serial;
dev_dbg(tty->dev, "%s\n", __func__);
if (!port->serial->type->wait_until_sent)
return;
mutex_lock(&serial->disc_mutex);
if (!serial->disconnected)
port->serial->type->wait_until_sent(tty, timeout);
mutex_unlock(&serial->disc_mutex);
}
static void serial_throttle(struct tty_struct *tty)
{
struct usb_serial_port *port = tty->driver_data;
......@@ -1191,6 +1207,7 @@ static const struct tty_operations serial_ops = {
.unthrottle = serial_unthrottle,
.break_ctl = serial_break,
.chars_in_buffer = serial_chars_in_buffer,
.wait_until_sent = serial_wait_until_sent,
.tiocmget = serial_tiocmget,
.tiocmset = serial_tiocmset,
.get_icount = serial_get_icount,
......
......@@ -268,6 +268,7 @@ struct usb_serial_driver {
struct usb_serial_port *port, struct ktermios *old);
void (*break_ctl)(struct tty_struct *tty, int break_state);
int (*chars_in_buffer)(struct tty_struct *tty);
void (*wait_until_sent)(struct tty_struct *tty, long timeout);
void (*throttle)(struct tty_struct *tty);
void (*unthrottle)(struct tty_struct *tty);
int (*tiocmget)(struct tty_struct *tty);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment