linux-kernel - [PATCH v2 5/5] input: i8042 - add runtime check in x86's i8042_platform

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Date:	Mon,  5 Jul 2010 23:03:22 +0800
From:	feng.tang@...el.com
To:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...e.hu,
	hpa@...or.com, jacob.jun.pan@...el.com, dtor@...l.ru,
	randy.dunlap@...cle.com
Cc:	Feng Tang <feng.tang@...el.com>
Subject: [PATCH v2 5/5] input: i8042 - add runtime check in x86's i8042_platform_init

From: Feng Tang <feng.tang@...el.com>

Then it will first check x86_platforms's i8042 detection result,
then go on with normal probe.

Cc: Dmitry Torokhov <dtor@...l.ru>
Signed-off-by: Feng Tang <feng.tang@...el.com>
---
 drivers/input/serio/i8042-x86ia64io.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
index 6168469..6228526 100644
--- a/drivers/input/serio/i8042-x86ia64io.h
+++ b/drivers/input/serio/i8042-x86ia64io.h
@@ -7,6 +7,8 @@
  * the Free Software Foundation.
  */
 
+#include <asm/x86_init.h>
+
 /*
  * Names.
  */
@@ -840,6 +842,12 @@ static int __init i8042_platform_init(void)
 {
 	int retval;
 
+#ifdef CONFIG_X86
+	/* Just return if pre-detection shows no i8042 controller exist */
+	if (!x86_platform.i8042_detect())
+		return -ENODEV;
+#endif
+
 /*
  * On ix86 platforms touching the i8042 data register region can do really
  * bad things. Because of this the region is always reserved on ix86 boxes.
-- 
1.7.0.4

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