1 files changed, 95 insertions, 0 deletions
diff --git a/lib/tpm-utils.h b/lib/tpm-utils.h
new file mode 100644
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+++ b/lib/tpm-utils.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2013 The Chromium OS Authors.
+ * Coypright (c) 2013 Guntermann & Drunck GmbH
+ */
+
+#ifndef __TPM_UTILS_H
+#define __TPM_UTILS_H
+
+#define COMMAND_BUFFER_SIZE 256
+
+/* Internal error of TPM command library */
+#define TPM_LIB_ERROR ((u32)~0u)
+
+/**
+ * tpm_open() - Request access to locality 0 for the caller
+ *
+ * After all commands have been completed the caller is supposed to
+ * call tpm_close().
+ *
+ * Returns 0 on success, -ve on failure.
+ */
+int tpm_open(struct udevice *dev);
+
+/**
+ * tpm_close() - Close the current session
+ *
+ * Releasing the locked locality. Returns 0 on success, -ve 1 on
+ * failure (in case lock removal did not succeed).
+ */
+int tpm_close(struct udevice *dev);
+
+/**
+ * Pack data into a byte string.  The data types are specified in
+ * the format string: 'b' means unsigned byte, 'w' unsigned word,
+ * 'd' unsigned double word, and 's' byte string.  The data are a
+ * series of offsets and values (for type byte string there are also
+ * lengths).  The data values are packed into the byte string
+ * sequentially, and so a latter value could over-write a former
+ * value.
+ *
+ * @param str		output string
+ * @param size		size of output string
+ * @param format	format string
+ * @param ...		data points
+ * @return 0 on success, non-0 on error
+ */
+int pack_byte_string(u8 *str, size_t size, const char *format, ...);
+
+/**
+ * Unpack data from a byte string.  The data types are specified in
+ * the format string: 'b' means unsigned byte, 'w' unsigned word,
+ * 'd' unsigned double word, and 's' byte string.  The data are a
+ * series of offsets and pointers (for type byte string there are also
+ * lengths).
+ *
+ * @param str		output string
+ * @param size		size of output string
+ * @param format	format string
+ * @param ...		data points
+ * @return 0 on success, non-0 on error
+ */
+int unpack_byte_string(const u8 *str, size_t size, const char *format, ...);
+
+/**
+ * Get TPM command size.
+ *
+ * @param command	byte string of TPM command
+ * @return command size of the TPM command
+ */
+u32 tpm_command_size(const void *command);
+
+/**
+ * Get TPM response return code, which is one of TPM_RESULT values.
+ *
+ * @param response	byte string of TPM response
+ * @return return code of the TPM response
+ */
+u32 tpm_return_code(const void *response);
+
+/**
+ * Send a TPM command and return response's return code, and optionally
+ * return response to caller.
+ *
+ * @param command	byte string of TPM command
+ * @param response	output buffer for TPM response, or NULL if the
+ *			caller does not care about it
+ * @param size_ptr	output buffer size (input parameter) and TPM
+ *			response length (output parameter); this parameter
+ *			is a bidirectional
+ * @return return code of the TPM response
+ */
+u32 tpm_sendrecv_command(const void *command, void *response, size_t *size_ptr);
+
+#endif /* __TPM_UTILS_H */