linux-kernel - [PATCH V2 3/3] input: Default to only using PNP for i8042 probing on x86

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Date:	Mon, 17 May 2010 11:38:36 -0400
From:	Matthew Garrett <mjg@...hat.com>
To:	linux-input@...r.kernel.org
Cc:	dmitry.torokhov@...il.com, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, Matthew Garrett <mjg@...hat.com>
Subject: [PATCH V2 3/3] input: Default to only using PNP for i8042 probing on x86

Experimenting with Windows has revealed that it will not probe the
keyboard controller unless a valid PNPACPI device is present. Change our
behaviour to match - users can override by using the existing
i8042.nopnp=1 parameter.

Signed-off-by: Matthew Garrett <mjg@...hat.com>
---
 drivers/input/serio/i8042-x86ia64io.h |    9 ++++++---
 1 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 6168469..a5b5926 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -1,6 +1,8 @@
 #ifndef _I8042_X86IA64IO_H
 #define _I8042_X86IA64IO_H
 
+#include <linux/acpi.h>
+
 /*
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published by
@@ -744,9 +746,10 @@ static int __init i8042_pnp_init(void)
 
 	if (!i8042_pnp_kbd_devices && !i8042_pnp_aux_devices) {
 		i8042_pnp_exit();
-#if defined(__ia64__)
-		return -ENODEV;
-#else
+
+		if (!acpi_disabled)
+			return -ENODEV;
+
 		printk(KERN_INFO "PNP: No PS/2 controller found. Probing ports directly.\n");
 		return 0;
 #endif
-- 
1.7.0.1

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