Add System76 ACPI device to kabylake

src/mainboard/system76/kbl-u/acpi/ec.asl

@@ -36,18 +36,23 @@ Device (EC)
     #include "acpi/ec_ram.asl"
 
     Name (ECOK, Zero)
-    Method (_REG, 2, NotSerialized)  // _REG: Region Availability
+    Method (_REG, 2, Serialized)  // _REG: Region Availability
     {
         Store ("EC: _REG", Debug)
-        If (((Arg0 == 0x03) && (Arg1 == One)))
-        {
-            ECOK = Arg1
-            ECOS = One
-            WINF = One
+        If (((Arg0 == 0x03) && (Arg1 == One))) {
+            // Enable software touchpad lock and airplane mode keys
+            ECOS = 2
 
+            // Enable software backlight keys
+            WINF = 1
+
+            // Set current AC state
             ^^^^AC.ACFG = ADP
 
             PNOT ()
+
+            // EC is now available
+            ECOK = Arg1
         }
     }
 
@@ -163,8 +168,15 @@ Device (EC)
         Notify (PWRB, 0x80)
     }
 
-    Method (_Q50, 0, NotSerialized) // TODO
+    Method (_Q50, 0, NotSerialized) // Other Events
     {
-        Store ("EC: 50", Debug)
+        Local0 = OEM4
+        If (Local0 == 0x8A) { // White Keyboard Backlight
+            Store ("EC: White Keyboard Backlight", Debug)
+            Notify (^^^^S76D, 0x80)
+        } Else {
+            Store ("EC: Other", Debug)
+            Store (Local0, Debug)
+        }
     }
 }

src/mainboard/system76/kbl-u/acpi/lid.asl

@@ -22,7 +22,7 @@ Device (LID0)
     {
         If (^^PCI0.LPCB.EC.ECOK)
         {
-            Return (\_SB.PCI0.LPCB.EC.LSTE)
+            Return (^^PCI0.LPCB.EC.LSTE)
         }
         Else
         {

src/mainboard/system76/kbl-u/acpi/mainboard.asl

@@ -20,4 +20,5 @@ Scope (\_SB)
     #include "buttons.asl"
     #include "hid.asl"
     #include "lid.asl"
+    #include "s76.asl"
 }

src/mainboard/system76/kbl-u/acpi/s76.asl

@@ -0,0 +1,61 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019 System76
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+Device (S76D) {
+    Name (_HID, "17761776")
+    Name (_UID, 0)
+
+    // Get Airplane LED
+    Method (GAPL, 0, Serialized) {
+        If (^^PCI0.LPCB.EC.ECOK) {
+            If (^^PCI0.LPCB.EC.AIRP & 0x40) {
+                Return (1)
+            }
+        }
+        Return (0)
+    }
+
+    // Set Airplane LED
+    Method (SAPL, 1, Serialized) {
+        If (^^PCI0.LPCB.EC.ECOK) {
+            If (Arg0) {
+                ^^PCI0.LPCB.EC.AIRP |= 0x40
+            } Else {
+                ^^PCI0.LPCB.EC.AIRP &= 0xBF
+            }
+        }
+    }
+
+    // Get KB LED
+    Method (GKBL, 0, Serialized) {
+        Local0 = 0
+        If (^^PCI0.LPCB.EC.ECOK) {
+            ^^PCI0.LPCB.EC.FDAT = One
+            ^^PCI0.LPCB.EC.FCMD = 0xCA
+            Local0 = ^^PCI0.LPCB.EC.FBUF
+            ^^PCI0.LPCB.EC.FCMD = Zero
+        }
+        Return (Local0)
+    }
+
+    // Set KB Led
+    Method (SKBL, 1, Serialized) {
+        If (^^PCI0.LPCB.EC.ECOK) {
+            ^^PCI0.LPCB.EC.FDAT = Zero
+            ^^PCI0.LPCB.EC.FBUF = Arg0
+            ^^PCI0.LPCB.EC.FCMD = 0xCA
+        }
+    }
+}

src/mainboard/system76/whl-u/acpi/ec.asl

@@ -36,7 +36,6 @@ Device (EC)
     #include "acpi/ec_ram.asl"
 
     Name (ECOK, Zero)
-    Name (TPSE, Zero)
     Method (_REG, 2, Serialized)  // _REG: Region Availability
     {
         Store ("EC: _REG", Debug)