From a75fe0d78ec00d3d5b2c42b1ee76b22e99f213d1 Mon Sep 17 00:00:00 2001
From: Corentin Chary <corentincj@iksaif.net>
Date: Sat, 26 Feb 2011 10:20:34 +0100
Subject: [PATCH] asus-wmi: handle "unknown status" bit
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
---
drivers/platform/x86/asus-wmi.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index d0f0931ea5eb4..39ce3c1a77127 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;
}
--
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