asus-wmi: Create quirk for airplane_mode LED

Some Asus laptops that have an airplane-mode indicator LED, also have
the WMI WLAN user bit set, and the following bits in their DSDT:

Scope (_SB)
{
  (...)
  Device (ATKD)
  {
    (...)
    Method (WMNB, 3, Serialized)
    {
      (...)
      If (LEqual (IIA0, 0x00010002))
      {
        OWGD (IIA1)
        Return (One)
      }
    }
  }
}

So when asus-wmi uses ASUS_WMI_DEVID_WLAN_LED (0x00010002) to store the
wlan state, it drives the airplane-mode indicator LED (through the call
to OWGD) in an inverted fashion: the LED is ON when airplane mode is OFF
(since wlan is ON), and vice-versa.

This commit creates a quirk to not register a RFKill switch at all for
these laptops, to allow the asus-wireless driver to drive the airplane
mode LED correctly through the ASHS ACPI device. It also adds a match to
that quirk for the Asus X555UB, which is affected by this problem.
Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com>
Reviewed-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

drivers/platform/x86/asus-nb-wmi.c

@@ -78,6 +78,10 @@ static struct quirk_entry quirk_asus_x200ca = {
 	.wapf = 2,
 };
 
+static struct quirk_entry quirk_no_rfkill = {
+	.no_rfkill = true,
+};
+
 static int dmi_matched(const struct dmi_system_id *dmi)
 {
 	quirks = dmi->driver_data;
@@ -306,6 +310,15 @@ static const struct dmi_system_id asus_quirks[] = {
 		},
 		.driver_data = &quirk_asus_x200ca,
 	},
+	{
+		.callback = dmi_matched,
+		.ident = "ASUSTeK COMPUTER INC. X555UB",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "X555UB"),
+		},
+		.driver_data = &quirk_no_rfkill,
+	},
 	{},
 };
 

drivers/platform/x86/asus-wmi.c

@@ -2069,9 +2069,11 @@ static int asus_wmi_add(struct platform_device *pdev)
 	if (err)
 		goto fail_leds;
 
+	if (!asus->driver->quirks->no_rfkill) {
 		err = asus_wmi_rfkill_init(asus);
 		if (err)
 			goto fail_rfkill;
+	}
 
 	/* Some Asus desktop boards export an acpi-video backlight interface,
 	   stop this from showing up */

drivers/platform/x86/asus-wmi.h

@@ -38,6 +38,7 @@ struct key_entry;
 struct asus_wmi;
 
 struct quirk_entry {
+	bool no_rfkill;
 	bool hotplug_wireless;
 	bool scalar_panel_brightness;
 	bool store_backlight_power;