1 files changed, 24 insertions, 0 deletions
diff --git a/board/herobrine_npcx9/hibernate.c b/board/herobrine_npcx9/hibernate.c
new file mode 100644
index 0000000000..f6ebf462aa
--- /dev/null
+++ b/board/herobrine_npcx9/hibernate.c
@@ -0,0 +1,24 @@
+/* Copyright 2021 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "gpio.h"
+
+void board_hibernate_late(void)
+{
+	/* Set the hibernate GPIO to turn off the rails */
+	gpio_set_level(GPIO_HIBERNATE_L, 0);
+}
+
+void board_hibernate(void)
+{
+	/*
+	 * Sensors are unpowered in hibernate. Apply PD to the
+	 * interrupt lines such that they don't float.
+	 */
+	gpio_set_flags(GPIO_ACCEL_GYRO_INT_L,
+		       GPIO_INPUT | GPIO_PULL_DOWN);
+	gpio_set_flags(GPIO_LID_ACCEL_INT_L,
+		       GPIO_INPUT | GPIO_PULL_DOWN);
+}