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asus-wmi: handle "unknown status" bit 

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Corentin Chary 2011-02-26 10:20:34 +01:00 committed by Matthew Garrett
parent a7ce3f041e
commit a75fe0d78e
1 changed files with 6 additions and 0 deletions
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6
drivers/platform/x86/asus-wmi.c
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@ -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;
}