linux-kernel - [PATCH 3/8] ideapad: make sure we bind on the correct device

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Date:	Wed, 18 Aug 2010 16:37:33 +0800
From:	Ike Panhc <ike.pan@...onical.com>
To:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Cc:	Thomas Renninger <trenn@...e.de>, Alan Cox <alan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Corentin Chary <corentincj@...aif.net>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Len Brown <len.brown@...el.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: [PATCH 3/8] ideapad: make sure we bind on the correct device

By reading from method _STA and _CFG to make sure we bind on the correct
VPC2004 device.

Signed-off-by: Ike Panhc <ike.pan@...onical.com>
---
 drivers/platform/x86/ideapad_acpi.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/platform/x86/ideapad_acpi.c b/drivers/platform/x86/ideapad_acpi.c
index 6176597..c1eec70 100644
--- a/drivers/platform/x86/ideapad_acpi.c
+++ b/drivers/platform/x86/ideapad_acpi.c
@@ -328,10 +328,18 @@ MODULE_DEVICE_TABLE(acpi, ideapad_device_ids);
 
 static int ideapad_acpi_add(struct acpi_device *adevice)
 {
-	int i;
+	int i, cfg;
 	int devs_present[5];
 	struct ideapad_private *priv;
 
+	if (read_method_int(adevice->handle, "_STA", &i))
+		return -ENODEV;
+	if (i != 0x0F)
+		return -ENODEV;
+
+	if (read_method_int(adevice->handle, "_CFG", &cfg))
+		return -ENODEV;
+
 	for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
 		devs_present[i] = ideapad_dev_exists(i);
 		if (devs_present[i] < 0)
-- 
1.7.0.4

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