Input: i8042 - add i8042.nokbd module option to allow supressing

       creation of keyboard port.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Documentation/kernel-parameters.txt

@@ -549,6 +549,7 @@ running once the system is up.
 			     keyboard and can not control its state
 			     (Don't attempt to blink the leds)
 	i8042.noaux	[HW] Don't check for auxiliary (== mouse) port
+	i8042.nokbd	[HW] Don't check/create keyboard port
 	i8042.nomux	[HW] Don't check presence of an active multiplexing
 			     controller
 	i8042.nopnp	[HW] Don't use ACPIPnP / PnPBIOS to discover KBD/AUX

drivers/input/serio/i8042-x86ia64io.h

@@ -297,6 +297,8 @@ static int __init i8042_pnp_init(void)
 		aux_irq_str);
 
 #if defined(__ia64__)
+	if (result_kbd <= 0)
+		i8042_nokbd = 1;
 	if (result_aux <= 0)
 		i8042_noaux = 1;
 #endif
@@ -315,7 +317,7 @@ static int __init i8042_pnp_init(void)
 		i8042_pnp_command_reg = i8042_command_reg;
 	}
 
-	if (!i8042_pnp_kbd_irq) {
+	if (!i8042_nokbd && !i8042_pnp_kbd_irq) {
 		printk(KERN_WARNING "PNP: PS/2 controller doesn't have KBD irq; using default %d\n", i8042_kbd_irq);
 		i8042_pnp_kbd_irq = i8042_kbd_irq;
 	}

drivers/input/serio/i8042.c

@@ -27,6 +27,10 @@ MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");
 MODULE_DESCRIPTION("i8042 keyboard and mouse controller driver");
 MODULE_LICENSE("GPL");
 
+static unsigned int i8042_nokbd;
+module_param_named(nokbd, i8042_nokbd, bool, 0);
+MODULE_PARM_DESC(nokbd, "Do not probe or use KBD port.");
+
 static unsigned int i8042_noaux;
 module_param_named(noaux, i8042_noaux, bool, 0);
 MODULE_PARM_DESC(noaux, "Do not probe or use AUX (mouse) port.");
@@ -1058,7 +1062,7 @@ static int __init i8042_create_mux_port(int index)
 
 static int __init i8042_init(void)
 {
-	int i;
+	int i, have_ports = 0;
 	int err;
 
 	dbg_init();
@@ -1100,11 +1104,20 @@ static int __init i8042_init(void)
 			if (err)
 				goto err_unregister_ports;
 		}
+		have_ports = 1;
 	}
 
-	err = i8042_create_kbd_port();
-	if (err)
-		goto err_unregister_ports;
+	if (!i8042_nokbd) {
+		err = i8042_create_kbd_port();
+		if (err)
+			goto err_unregister_ports;
+		have_ports = 1;
+	}
+
+	if (!have_ports) {
+		err = -ENODEV;
+		goto err_unregister_device;
+	}
 
 	mod_timer(&i8042_timer, jiffies + I8042_POLL_PERIOD);
 
@@ -1114,6 +1127,7 @@ static int __init i8042_init(void)
 	for (i = 0; i < I8042_NUM_PORTS; i++)
 		if (i8042_ports[i].serio)
 			serio_unregister_port(i8042_ports[i].serio);
+ err_unregister_device:
 	platform_device_unregister(i8042_platform_device);
  err_unregister_driver:
 	driver_unregister(&i8042_driver);