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1 | /* |
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 | */ | |
36 | int 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 | */ | |
46 | int 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 | */ | |
55 | int 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 | */ | |
70 | int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf, | |
71 | size_t *recv_len); | |
72 | ||
73 | #endif /* __TIS_H */ |