1 files changed, 38 insertions, 0 deletions
diff --git a/chip/stm32/usart_host_command.h b/chip/stm32/usart_host_command.h
new file mode 100644
index 0000000000..ee41d8a59b
--- /dev/null
+++ b/chip/stm32/usart_host_command.h
@@ -0,0 +1,38 @@
+/* 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.
+ */
+
+#ifndef __CROS_EC_USART_HOST_COMMAND_H
+#define __CROS_EC_USART_HOST_COMMAND_H
+
+#include <stdarg.h>  /* For va_list */
+#include "common.h"
+#include "gpio.h"
+#include "host_command.h"
+#include "usart.h"
+
+/*
+ * Add data to host command layer buffer.
+ */
+size_t usart_host_command_rx_append_data(struct usart_config const *config,
+					 const uint8_t *src, size_t count);
+
+/*
+ * Remove data from the host command layer buffer.
+ */
+size_t usart_host_command_tx_remove_data(struct usart_config const *config,
+					 uint8_t *dest);
+
+/*
+ * Get USART protocol information. This function is called in runtime if
+ * board's host command transport is USART.
+ */
+enum ec_status usart_get_protocol_info(struct host_cmd_handler_args *args);
+
+/*
+ * Initialize USART host command layer.
+ */
+void usart_host_command_init(void);
+
+#endif /* __CROS_EC_USART_HOST_COMMAND_H */