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Che-liang Chiou8732b072013-02-28 09:34:57 +00001/*
2 * Copyright (c) 2011 The Chromium OS Authors.
3 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02004 * SPDX-License-Identifier: GPL-2.0+
Che-liang Chiou8732b072013-02-28 09:34:57 +00005 */
6
7#ifndef __TIS_H
8#define __TIS_H
9
10#include <common.h>
11
12/* Low-level interface to access TPM */
13
14/*
15 * tis_init()
16 *
17 * Initialize the TPM device. Returns 0 on success or -1 on
18 * failure (in case device probing did not succeed).
19 */
20int tis_init(void);
21
22/*
23 * tis_open()
24 *
25 * Requests access to locality 0 for the caller. After all commands have been
26 * completed the caller is supposed to call tis_close().
27 *
28 * Returns 0 on success, -1 on failure.
29 */
30int tis_open(void);
31
32/*
33 * tis_close()
34 *
35 * terminate the currect session with the TPM by releasing the locked
36 * locality. Returns 0 on success of -1 on failure (in case lock
37 * removal did not succeed).
38 */
39int tis_close(void);
40
41/*
42 * tis_sendrecv()
43 *
44 * Send the requested data to the TPM and then try to get its response
45 *
46 * @sendbuf - buffer of the data to send
47 * @send_size size of the data to send
48 * @recvbuf - memory to save the response to
49 * @recv_len - pointer to the size of the response buffer
50 *
51 * Returns 0 on success (and places the number of response bytes at recv_len)
52 * or -1 on failure.
53 */
54int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf,
55 size_t *recv_len);
56
57#endif /* __TIS_H */