1 files changed, 84 insertions, 0 deletions
diff --git a/src/mainboard/system76/kbl-u/acpi/s76.asl b/src/mainboard/system76/kbl-u/acpi/s76.asl
new file mode 100644
index 0000000000..399e569734
--- /dev/null
+++ b/src/mainboard/system76/kbl-u/acpi/s76.asl
@@ -0,0 +1,84 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+// Notifications:
+//   0x80 - hardware backlight toggle
+//   0x81 - backlight toggle
+//   0x82 - backlight down
+//   0x83 - backlight up
+//   0x84 - backlight color change
+Device (S76D) {
+	Name (_HID, "17761776")
+	Name (_UID, 0)
+
+	Method (RSET, 0, Serialized) {
+		Debug = "S76D: RSET"
+		SAPL(0)
+		SKBL(0)
+	}
+
+	Method (INIT, 0, Serialized) {
+		Debug = "S76D: INIT"
+		RSET()
+		If (^^PCI0.LPCB.EC0.ECOK) {
+			// Set flags to use software control
+			^^PCI0.LPCB.EC0.ECOS = 2
+			Return (0)
+		} Else {
+			Return (1)
+		}
+	}
+
+	Method (FINI, 0, Serialized) {
+		Debug = "S76D: FINI"
+		RSET()
+		If (^^PCI0.LPCB.EC0.ECOK) {
+			// Set flags to use hardware control
+			^^PCI0.LPCB.EC0.ECOS = 1
+			Return (0)
+		} Else {
+			Return (1)
+		}
+	}
+
+	// Get Airplane LED
+	Method (GAPL, 0, Serialized) {
+		If (^^PCI0.LPCB.EC0.ECOK) {
+			If (^^PCI0.LPCB.EC0.AIRP & 0x40) {
+				Return (1)
+			}
+		}
+		Return (0)
+	}
+
+	// Set Airplane LED
+	Method (SAPL, 1, Serialized) {
+		If (^^PCI0.LPCB.EC0.ECOK) {
+			If (Arg0) {
+				^^PCI0.LPCB.EC0.AIRP |= 0x40
+			} Else {
+				^^PCI0.LPCB.EC0.AIRP &= 0xBF
+			}
+		}
+	}
+
+	// Get KB LED
+	Method (GKBL, 0, Serialized) {
+		Local0 = 0
+		If (^^PCI0.LPCB.EC0.ECOK) {
+			^^PCI0.LPCB.EC0.FDAT = One
+			^^PCI0.LPCB.EC0.FCMD = 0xCA
+			Local0 = ^^PCI0.LPCB.EC0.FBUF
+			^^PCI0.LPCB.EC0.FCMD = Zero
+		}
+		Return (Local0)
+	}
+
+	// Set KB Led
+	Method (SKBL, 1, Serialized) {
+		If (^^PCI0.LPCB.EC0.ECOK) {
+			^^PCI0.LPCB.EC0.FDAT = Zero
+			^^PCI0.LPCB.EC0.FBUF = Arg0
+			^^PCI0.LPCB.EC0.FCMD = 0xCA
+		}
+	}
+}