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Che-liang Chiou8732b072013-02-28 09:34:57 +00001/*
2 * Copyright (c) 2011 The Chromium OS Authors.
3 *
4 * See file CREDITS for list of people who contributed to this
5 * project.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
21 */
22
23#ifndef __TIS_H
24#define __TIS_H
25
26#include <common.h>
27
28/* Low-level interface to access TPM */
29
30/*
31 * tis_init()
32 *
33 * Initialize the TPM device. Returns 0 on success or -1 on
34 * failure (in case device probing did not succeed).
35 */
36int tis_init(void);
37
38/*
39 * tis_open()
40 *
41 * Requests access to locality 0 for the caller. After all commands have been
42 * completed the caller is supposed to call tis_close().
43 *
44 * Returns 0 on success, -1 on failure.
45 */
46int tis_open(void);
47
48/*
49 * tis_close()
50 *
51 * terminate the currect session with the TPM by releasing the locked
52 * locality. Returns 0 on success of -1 on failure (in case lock
53 * removal did not succeed).
54 */
55int tis_close(void);
56
57/*
58 * tis_sendrecv()
59 *
60 * Send the requested data to the TPM and then try to get its response
61 *
62 * @sendbuf - buffer of the data to send
63 * @send_size size of the data to send
64 * @recvbuf - memory to save the response to
65 * @recv_len - pointer to the size of the response buffer
66 *
67 * Returns 0 on success (and places the number of response bytes at recv_len)
68 * or -1 on failure.
69 */
70int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf,
71 size_t *recv_len);
72
73#endif /* __TIS_H */