blob: 40a1f867627a66209618048257077452ecfa143f
1 | /* |
2 | * Copyright (c) 2011 The Chromium OS Authors. |
3 | * |
4 | * SPDX-License-Identifier: GPL-2.0+ |
5 | */ |
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 | */ |
20 | int 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 | */ |
30 | int 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 | */ |
39 | int 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 | */ |
54 | int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf, |
55 | size_t *recv_len); |
56 | |
57 | #endif /* __TIS_H */ |
58 |