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1 | /* |
2 | * Copyright (c) 2011 The Chromium OS Authors. | |
3 | * | |
1a459660 | 4 | * SPDX-License-Identifier: GPL-2.0+ |
8732b070 CC |
5 | */ |
6 | ||
7 | #ifndef __TIS_H | |
8 | #define __TIS_H | |
9 | ||
f255d31f SG |
10 | #ifndef CONFIG_DM_TPM |
11 | ||
8732b070 CC |
12 | #include <common.h> |
13 | ||
14 | /* Low-level interface to access TPM */ | |
15 | ||
16 | /* | |
17 | * tis_init() | |
18 | * | |
19 | * Initialize the TPM device. Returns 0 on success or -1 on | |
20 | * failure (in case device probing did not succeed). | |
21 | */ | |
22 | int tis_init(void); | |
23 | ||
24 | /* | |
25 | * tis_open() | |
26 | * | |
27 | * Requests access to locality 0 for the caller. After all commands have been | |
28 | * completed the caller is supposed to call tis_close(). | |
29 | * | |
30 | * Returns 0 on success, -1 on failure. | |
31 | */ | |
32 | int tis_open(void); | |
33 | ||
34 | /* | |
35 | * tis_close() | |
36 | * | |
37 | * terminate the currect session with the TPM by releasing the locked | |
38 | * locality. Returns 0 on success of -1 on failure (in case lock | |
39 | * removal did not succeed). | |
40 | */ | |
41 | int tis_close(void); | |
42 | ||
43 | /* | |
44 | * tis_sendrecv() | |
45 | * | |
46 | * Send the requested data to the TPM and then try to get its response | |
47 | * | |
48 | * @sendbuf - buffer of the data to send | |
49 | * @send_size size of the data to send | |
50 | * @recvbuf - memory to save the response to | |
51 | * @recv_len - pointer to the size of the response buffer | |
52 | * | |
53 | * Returns 0 on success (and places the number of response bytes at recv_len) | |
54 | * or -1 on failure. | |
55 | */ | |
56 | int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf, | |
57 | size_t *recv_len); | |
f255d31f | 58 | #endif |
8732b070 CC |
59 | |
60 | #endif /* __TIS_H */ |