Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

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

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

drivers/usb/serial/usb-serial.c

+17 −0
Original line number Diff line number Diff line
@@ -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,

include/linux/usb/serial.h

+1 −0
Original line number Diff line number Diff line
@@ -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);