Input: make serio open and close methods optional

drivers/input/mouse/synaptics.c

@@ -212,15 +212,6 @@ static int synaptics_set_mode(struct psmouse *psmouse, int mode)
 /*****************************************************************************
  *	Synaptics pass-through PS/2 port support
  ****************************************************************************/
-static int synaptics_pt_open(struct serio *port)
-{
-	return 0;
-}
-
-static void synaptics_pt_close(struct serio *port)
-{
-}
-
 static int synaptics_pt_write(struct serio *port, unsigned char c)
 {
 	struct psmouse *parent = port->driver;
@@ -282,8 +273,6 @@ static void synaptics_pt_create(struct psmouse *psmouse)
 	port->serio.name = "Synaptics pass-through";
 	port->serio.phys = "synaptics-pt/serio0";
 	port->serio.write = synaptics_pt_write;
-	port->serio.open = synaptics_pt_open;
-	port->serio.close = synaptics_pt_close;
 	port->serio.driver = psmouse;
 
 	port->activate = synaptics_pt_activate;

drivers/input/serio/parkbd.c

@@ -86,20 +86,9 @@ static int parkbd_write(struct serio *port, unsigned char c)
 	return 0;
 }
 
-static int parkbd_open(struct serio *port)
-{
-	return 0;
-}
-
-static void parkbd_close(struct serio *port)
-{
-}
-
 static struct serio parkbd_port =
 {
 	.write	= parkbd_write,
-	.open	= parkbd_open,
-	.close	= parkbd_close,
 	.name	= parkbd_name,
 	.phys	= parkbd_phys,
 };

drivers/input/serio/q40kbd.c

@@ -47,23 +47,12 @@ MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION("Q40 PS/2 keyboard controller driver");
 MODULE_LICENSE("GPL");
 
-
-static int q40kbd_open(struct serio *port)
-{
-	return 0;
-}
-static void q40kbd_close(struct serio *port)
-{
-}
-
 static struct serio q40kbd_port =
 {
 	.type	= SERIO_8042,
 	.name	= "Q40 kbd port",
 	.phys	= "Q40",
 	.write	= NULL,
-	.open	= q40kbd_open,
-	.close	= q40kbd_close,
 };
 
 static irqreturn_t q40kbd_interrupt(int irq, void *dev_id,

drivers/input/serio/serio.c

@@ -293,7 +293,7 @@ void serio_unregister_device(struct serio_dev *dev)
 int serio_open(struct serio *serio, struct serio_dev *dev)
 {
 	serio->dev = dev;
-	if (serio->open(serio)) {
+	if (serio->open && serio->open(serio)) {
 		serio->dev = NULL;
 		return -1;
 	}
@@ -303,6 +303,7 @@ int serio_open(struct serio *serio, struct serio_dev *dev)
 /* called from serio_dev->connect/disconnect methods under serio_sem */
 void serio_close(struct serio *serio)
 {
+	if (serio->close)
 		serio->close(serio);
 	serio->dev = NULL;
 }

drivers/input/serio/serport.c

@@ -48,11 +48,6 @@ static int serport_serio_write(struct serio *serio, unsigned char data)
 	return -(serport->tty->driver->write(serport->tty, 0, &data, 1) != 1);
 }
 
-static int serport_serio_open(struct serio *serio)
-{
-        return 0;
-}
-
 static void serport_serio_close(struct serio *serio)
 {
 	struct serport *serport = serio->driver;
@@ -87,7 +82,6 @@ static int serport_ldisc_open(struct tty_struct *tty)
 
 	serport->serio.type = SERIO_RS232;
 	serport->serio.write = serport_serio_write;
-	serport->serio.open = serport_serio_open;
 	serport->serio.close = serport_serio_close;
 	serport->serio.driver = serport;