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tpm.h
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1 /*
2  * Copyright (C) 2004,2007,2008 IBM Corporation
3  *
4  * Authors:
5  * Leendert van Doorn <leendert@watson.ibm.com>
6  * Dave Safford <safford@watson.ibm.com>
7  * Reiner Sailer <sailer@watson.ibm.com>
8  * Kylene Hall <kjhall@us.ibm.com>
9  * Debora Velarde <dvelarde@us.ibm.com>
10  *
11  * Maintained by: <tpmdd_devel@lists.sourceforge.net>
12  *
13  * Device driver for TCG/TCPA TPM (trusted platform module).
14  * Specifications at www.trustedcomputinggroup.org
15  *
16  * This program is free software; you can redistribute it and/or
17  * modify it under the terms of the GNU General Public License as
18  * published by the Free Software Foundation, version 2 of the
19  * License.
20  *
21  */
22 #ifndef __LINUX_TPM_H__
23 #define __LINUX_TPM_H__
24 
25 /*
26  * Chip num is this value or a valid tpm idx
27  */
28 #define TPM_ANY_NUM 0xFFFF
29 
30 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
31 
32 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
33 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
34 extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
35 extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
36 #else
37 static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
38  return -ENODEV;
39 }
40 static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
41  return -ENODEV;
42 }
43 static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
44  return -ENODEV;
45 }
46 static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
47  return -ENODEV;
48 }
49 #endif
50 #endif
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