ec/google/wilco: Add EC ACPI methods for privacy screen

Add ACPI methods to the Wilco EC for controlling a privacy screen
on the device.

BUG=b:142237145, b:142656363
TEST=none

Change-Id: Ic3c136f9d2de90eeb3c9e468e4c7430ccf6dcc42
Signed-off-by: Mathew King <mathewk@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36044
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/src/ec/google/wilco/acpi/privacy.asl b/src/ec/google/wilco/acpi/privacy.asl
new file mode 100644
index 0000000000..5c620b0fca
--- /dev/null
+++ b/src/ec/google/wilco/acpi/privacy.asl
@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2019 Google LLC
+ *
+ * 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.
+ */
+
+/* Read Privacy Screen Present */
+Method (GPVD, 0, Serialized)
+{
+	Return (R (EPDT))
+}
+
+/* Read Privacy Screen Status */
+Method (GPVX, 0, Serialized)
+{
+	If (R (EPST) == Zero) {
+		Return (Zero)
+	}
+
+	Return (One)
+}
+
+/* Enable Privacy Screen */
+Method (EPVX, 0, Serialized)
+{
+	W (EPCT, One)
+}
+
+/* Disable Privacy Screen */
+Method (DPVX, 0, Serialized)
+{
+	W (EPCT, Zero)
+}