--- linux-2.4.22/drivers/usb/serial/pl2303.c	2006-05-12 16:05:17.000000000 -0400
+++ linux-2.4.22-fred/drivers/usb/serial/pl2303.c	2006-05-12 18:00:39.000000000 -0400
@@ -642,14 +642,56 @@ static int wait_modem_info(struct usb_se
 	return 0;
 }
 
+
 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 {
+	struct pl2303_private *priv = port->private;
+	unsigned int value;
+
 	dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 
 	switch (cmd) {
 		case TIOCMIWAIT:
 			dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
 			return wait_modem_info(port, arg);
+	
+		case TIOCMGET:
+			value = ((priv->line_control & CONTROL_DTR)		? TIOCM_DTR : 0)
+			  | ((priv->line_control & CONTROL_RTS)	? TIOCM_RTS : 0)
+			  | ((priv->line_status & UART_CTS)	? TIOCM_CTS : 0)
+			  | ((priv->line_status & UART_DSR)	? TIOCM_DSR : 0)
+			  | ((priv->line_status & UART_RING)	? TIOCM_RI  : 0)
+			  | ((priv->line_status & UART_DCD)	? TIOCM_CD  : 0); 
+
+			if (put_user(value, (unsigned int *) arg))
+				return -EFAULT;
+			return 0;
+	
+		case TIOCMSET:
+			if (get_user(value, (unsigned int *) arg))
+				return -EFAULT;
+			priv->line_control &= ~(CONTROL_RTS | CONTROL_DTR);
+			priv->line_control |= ((arg & TIOCM_RTS) ? CONTROL_RTS : 0);
+			priv->line_control |= ((arg & TIOCM_DTR) ? CONTROL_DTR : 0);
+			return set_control_lines (port->serial->dev, priv->line_control);
+    
+		case TIOCMBIS:
+			if (get_user(value, (unsigned int *) arg))
+				return -EFAULT;
+			if (value & TIOCM_RTS)
+				priv->line_control |= CONTROL_RTS;
+			if (value & TIOCM_DTR)
+				priv->line_control |= CONTROL_DTR;
+			return set_control_lines (port->serial->dev, priv->line_control);
+        
+		case TIOCMBIC:
+			if (get_user(value, (unsigned int *) arg))
+				return -EFAULT;
+			if (value & TIOCM_RTS)
+				priv->line_control &= ~CONTROL_RTS;
+			if (value & TIOCM_DTR)
+				priv->line_control &= ~CONTROL_DTR;
+			return set_control_lines (port->serial->dev, priv->line_control);
 
 		default:
 			dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);