1 files changed, 20 insertions, 0 deletions
diff --git a/common/usb_pd_dual_role.c b/common/usb_pd_dual_role.c
new file mode 100644
index 0000000000..f00b5981b9
--- /dev/null
+++ b/common/usb_pd_dual_role.c
@@ -0,0 +1,20 @@
+/* Copyright 2020 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.
+ *
+ * Dual Role (Source & Sink) USB-PD module.
+ */
+
+#include "usb_pd.h"
+
+int pd_charge_from_device(uint16_t vid, uint16_t pid)
+{
+	/* TODO: rewrite into table if we get more of these */
+	/*
+	 * White-list Apple charge-through accessory since it doesn't set
+	 * unconstrained bit, but we still need to charge from it when
+	 * we are a sink.
+	 */
+	return (vid == USB_VID_APPLE &&
+		(pid == USB_PID1_APPLE || pid == USB_PID2_APPLE));
+}