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#define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */
26
27/*
28 * Chip num is this value or a valid tpm idx
29 */
30#define	TPM_ANY_NUM 0xFFFF
31
32struct tpm_chip;
33struct trusted_key_payload;
34struct trusted_key_options;
35
36struct tpm_class_ops {
37	const u8 req_complete_mask;
38	const u8 req_complete_val;
39	bool (*req_canceled)(struct tpm_chip *chip, u8 status);
40	int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
41	int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
42	void (*cancel) (struct tpm_chip *chip);
43	u8 (*status) (struct tpm_chip *chip);
44	bool (*update_timeouts)(struct tpm_chip *chip,
45				unsigned long *timeout_cap);
46
47};
48
49#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
50
51extern int tpm_is_tpm2(u32 chip_num);
52extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
53extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
54extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
55extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
56extern int tpm_seal_trusted(u32 chip_num,
57			    struct trusted_key_payload *payload,
58			    struct trusted_key_options *options);
59extern int tpm_unseal_trusted(u32 chip_num,
60			      struct trusted_key_payload *payload,
61			      struct trusted_key_options *options);
62#else
63static inline int tpm_is_tpm2(u32 chip_num)
64{
65	return -ENODEV;
66}
67static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
68	return -ENODEV;
69}
70static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
71	return -ENODEV;
72}
73static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
74	return -ENODEV;
75}
76static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
77	return -ENODEV;
78}
79
80static inline int tpm_seal_trusted(u32 chip_num,
81				   struct trusted_key_payload *payload,
82				   struct trusted_key_options *options)
83{
84	return -ENODEV;
85}
86static inline int tpm_unseal_trusted(u32 chip_num,
87				     struct trusted_key_payload *payload,
88				     struct trusted_key_options *options)
89{
90	return -ENODEV;
91}
92#endif
93#endif
94