[PATCH v2 34/85] USB: serial: add tiocmiwait subdriver operation

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Add tiocmiwait operation to struct usb_serial_driver.

Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
---
 drivers/usb/serial/usb-serial.c | 15 +++++++++++----
 include/linux/usb/serial.h      |  1 +
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index c481a80..c17becb 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -406,10 +406,17 @@ static int serial_ioctl(struct tty_struct *tty,
 
 	dev_dbg(tty->dev, "%s - cmd 0x%.4x\n", __func__, cmd);
 
-	if (port->serial->type->ioctl)
-		retval = port->serial->type->ioctl(tty, cmd, arg);
-	else
-		retval = -ENOIOCTLCMD;
+	switch (cmd) {
+	case TIOCMIWAIT:
+		if (port->serial->type->tiocmiwait)
+			retval = port->serial->type->tiocmiwait(tty, arg);
+		break;
+	default:
+		if (port->serial->type->ioctl)
+			retval = port->serial->type->ioctl(tty, cmd, arg);
+		else
+			retval = -ENOIOCTLCMD;
+	}
 
 	return retval;
 }
diff --git a/include/linux/usb/serial.h b/include/linux/usb/serial.h
index d7f6b59..8cb74c0 100644
--- a/include/linux/usb/serial.h
+++ b/include/linux/usb/serial.h
@@ -270,6 +270,7 @@ struct usb_serial_driver {
 	int  (*tiocmget)(struct tty_struct *tty);
 	int  (*tiocmset)(struct tty_struct *tty,
 			 unsigned int set, unsigned int clear);
+	int  (*tiocmiwait)(struct tty_struct *tty, unsigned long arg);
 	int  (*get_icount)(struct tty_struct *tty,
 			struct serial_icounter_struct *icount);
 	/* Called by the tty layer for port level work. There may or may not
-- 
1.8.1.5

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