linux-kernel - [PATCH 05/14] asus-wmi: handle "unknown status" bit

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Date:	Sat, 26 Feb 2011 10:20:34 +0100
From:	Corentin Chary <corentincj@...aif.net>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Corentin Chary <corentincj@...aif.net>,
	acpi4asus-user@...ts.sourceforge.net (open list:ASUS NOTEBOOKS AN...),
	platform-driver-x86@...r.kernel.org (open list:ASUS NOTEBOOKS AN...),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 05/14] asus-wmi: handle "unknown status" bit

Signed-off-by: Corentin Chary <corentincj@...aif.net>
---
 drivers/platform/x86/asus-wmi.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index d0f0931..39ce3c1 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -92,6 +92,7 @@ MODULE_LICENSE("GPL");
 
 /* DSTS masks */
 #define ASUS_WMI_DSTS_STATUS_BIT	0x00000001
+#define ASUS_WMI_DSTS_UNKNOWN_BIT	0x00000002
 #define ASUS_WMI_DSTS_PRESENCE_BIT	0x00010000
 #define ASUS_WMI_DSTS_BRIGHTNESS_MASK	0x000000FF
 #define ASUS_WMI_DSTS_MAX_BRIGTH_MASK	0x0000FF00
@@ -270,6 +271,11 @@ static int asus_wmi_get_devstate_bits(u32 dev_id, u32 mask)
 	if (!(retval & ASUS_WMI_DSTS_PRESENCE_BIT))
 		return -ENODEV;
 
+	if (mask == ASUS_WMI_DSTS_STATUS_BIT) {
+		if (retval & ASUS_WMI_DSTS_UNKNOWN_BIT)
+			return -ENODEV;
+	}
+
 	return retval & mask;
 }
 
-- 
1.7.4

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