[PATCH] platform/x86: asus-wmi: Consider device is absent when the read is ~0

[Kai-Heng Feng]

AAEON PICO-TGU4 board doesn't have any LED but there are bogus LED
controls under /sys/class/leds:
$ ls /sys/class/leds
asus::kbd_backlight asus::lightbar  platform::micmute

The reason is that the ~0 read from asus_wmi_get_devstate() is treated
as a valid state, in truth it means the device is absent.

So filter out ~0 read to prevent bogus LED controls being created.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
---
 drivers/platform/x86/asus-wmi.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 18be35fdb381..8cb2afafde16 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -489,7 +489,17 @@ static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer args)
 
 static int asus_wmi_get_devstate(struct asus_wmi *asus, u32 dev_id, u32 *retval)
 {
-	return asus_wmi_evaluate_method(asus->dsts_id, dev_id, 0, retval);
+	int err;
+
+	err = asus_wmi_evaluate_method(asus->dsts_id, dev_id, 0, retval);
+
+	if (err)
+		return err;
+
+	if (*retval == ~0)
+		return -ENODEV;
+
+	return 0;
 }
 
 static int asus_wmi_set_devstate(u32 dev_id, u32 ctrl_param,
-- 
2.34.1