diff -Naur -X linux-2.6.32-rc6-driver-core.current/Documentation/dontdiff linux-2.6.32-rc6-driver-core.current/drivers/char/tty_port.c linux-2.6.32-rc6-tty.current/drivers/char/tty_port.c
--- linux-2.6.32-rc6-driver-core.current/drivers/char/tty_port.c	2009-11-04 15:20:16.000000000 -0800
+++ linux-2.6.32-rc6-tty.current/drivers/char/tty_port.c	2009-11-06 20:56:19.000000000 -0800
@@ -221,6 +221,9 @@
 	   the port has just hung up or is in another error state */
 	if ((filp->f_flags & O_NONBLOCK) ||
 			(tty->flags & (1 << TTY_IO_ERROR))) {
+		/* Indicate we are open */
+		if (tty->termios->c_cflag & CBAUD)
+			tty_port_raise_dtr_rts(port);
 		port->flags |= ASYNC_NORMAL_ACTIVE;
 		return 0;
 	}
diff -Naur -X linux-2.6.32-rc6-driver-core.current/Documentation/dontdiff linux-2.6.32-rc6-driver-core.current/drivers/usb/serial/cp210x.c linux-2.6.32-rc6-tty.current/drivers/usb/serial/cp210x.c
--- linux-2.6.32-rc6-driver-core.current/drivers/usb/serial/cp210x.c	2009-11-04 15:20:45.000000000 -0800
+++ linux-2.6.32-rc6-tty.current/drivers/usb/serial/cp210x.c	2009-11-06 20:56:19.000000000 -0800
@@ -50,6 +50,8 @@
 static void cp210x_break_ctl(struct tty_struct *, int);
 static int cp210x_startup(struct usb_serial *);
 static void cp210x_disconnect(struct usb_serial *);
+static void cp210x_dtr_rts(struct usb_serial_port *p, int on);
+static int cp210x_carrier_raised(struct usb_serial_port *p);
 
 static int debug;
 
@@ -143,6 +145,8 @@
 	.tiocmset		= cp210x_tiocmset,
 	.attach			= cp210x_startup,
 	.disconnect		= cp210x_disconnect,
+	.dtr_rts		= cp210x_dtr_rts,
+	.carrier_raised		= cp210x_carrier_raised
 };
 
 /* Config request types */
@@ -746,6 +750,14 @@
 	return cp210x_set_config(port, CP210X_SET_MHS, &control, 2);
 }
 
+static void cp210x_dtr_rts(struct usb_serial_port *p, int on)
+{
+	if (on)
+		cp210x_tiocmset_port(p, NULL,  TIOCM_DTR|TIOCM_RTS, 0);
+	else
+		cp210x_tiocmset_port(p, NULL,  0, TIOCM_DTR|TIOCM_RTS);
+}
+
 static int cp210x_tiocmget (struct tty_struct *tty, struct file *file)
 {
 	struct usb_serial_port *port = tty->driver_data;
@@ -768,6 +780,15 @@
 	return result;
 }
 
+static int cp210x_carrier_raised(struct usb_serial_port *p)
+{
+	unsigned int control;
+	cp210x_get_config(p, CP210X_GET_MDMSTS, &control, 1);
+	if (control & CONTROL_DCD)
+		return 1;
+	return 0;
+}
+
 static void cp210x_break_ctl (struct tty_struct *tty, int break_state)
 {
 	struct usb_serial_port *port = tty->driver_data;