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USB: serial: add wait_until_sent operation

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Add wait_until_sent operation which can be used to wait for hardware
buffers to drain.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2013-05-05 20:32:27 +02:00 • committed by Greg Kroah-Hartman
parent 3b9561e9d9
commit 0693196fe7
2 changed files with 18 additions and 0 deletions
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17
drivers/usb/serial/usb-serial.c
View file

@ -375,6 +375,22 @@ static int serial_chars_in_buffer(struct tty_struct *tty)
return count; 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) static void serial_throttle(struct tty_struct *tty)
{ {
struct usb_serial_port *port = tty->driver_data; struct usb_serial_port *port = tty->driver_data;
@ -1191,6 +1207,7 @@ static const struct tty_operations serial_ops = {
.unthrottle = serial_unthrottle, .unthrottle = serial_unthrottle,
.break_ctl = serial_break, .break_ctl = serial_break,
.chars_in_buffer = serial_chars_in_buffer, .chars_in_buffer = serial_chars_in_buffer,
.wait_until_sent = serial_wait_until_sent,
.tiocmget = serial_tiocmget, .tiocmget = serial_tiocmget,
.tiocmset = serial_tiocmset, .tiocmset = serial_tiocmset,
.get_icount = serial_get_icount, .get_icount = serial_get_icount,

1
include/linux/usb/serial.h
View file

@ -268,6 +268,7 @@ struct usb_serial_driver {
struct usb_serial_port *port, struct ktermios *old); struct usb_serial_port *port, struct ktermios *old);
void (*break_ctl)(struct tty_struct *tty, int break_state); void (*break_ctl)(struct tty_struct *tty, int break_state);
int (*chars_in_buffer)(struct tty_struct *tty); 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 (*throttle)(struct tty_struct *tty);
void (*unthrottle)(struct tty_struct *tty); void (*unthrottle)(struct tty_struct *tty);
int (*tiocmget)(struct tty_struct *tty); int (*tiocmget)(struct tty_struct *tty);