pd: add first version of TCPCI I2C interface

Add first version of TCPCI (type-C port controller interface),
which is an I2C protocol for interfacing with TCPCs.

This is roughly tracking version 0.56 of the PD Interface spec.

BUG=none
BRANCH=none
TEST=tested on oak. modified oak EC to be TCPM and oak PD to
be TCPC and tested we can negotiate with hoho and zinger.

Change-Id: I83644ca83f2d3ce69d5d8356beca20a7ab155a87
Signed-off-by: Alec Berg <alecaberg@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/270172

1 files changed, 26 insertions, 0 deletions

diff --git a/include/usb_pd_tcpc.h b/include/usb_pd_tcpc.h
new file mode 100644
index 0000000000..b954c6f7ae
--- /dev/null
+++ b/include/usb_pd_tcpc.h
@@ -0,0 +1,26 @@
+/* Copyright 2015 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.
+ */
+
+/* USB Power delivery port controller */
+
+#ifndef __USB_PD_TCPC_H
+#define __USB_PD_TCPC_H
+
+#ifndef CONFIG_TCPC_I2C_BASE_ADDR
+#define CONFIG_TCPC_I2C_BASE_ADDR 0x9c
+#endif
+
+/**
+ * Process incoming TCPCI I2C command
+ *
+ * @param read This is a read request. If 0, this is a write request.
+ * @param len Length of incoming payload
+ * @param payload Pointer to incoming and outgoing data
+ * @param send_response Function to call to send response if necessary
+ */
+void tcpc_i2c_process(int read, int port, int len, uint8_t *payload,
+		      void (*send_response)(int));
+
+#endif /* __USB_PD_TCPC_H */