summaryrefslogtreecommitdiff
path: root/include/linux/tpm.h
blob: bcdd3790e94ddeac42161e55f98dcb284949a2d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
/*
 * Copyright (C) 2004,2007,2008 IBM Corporation
 *
 * Authors:
 * Leendert van Doorn <leendert@watson.ibm.com>
 * Dave Safford <safford@watson.ibm.com>
 * Reiner Sailer <sailer@watson.ibm.com>
 * Kylene Hall <kjhall@us.ibm.com>
 * Debora Velarde <dvelarde@us.ibm.com>
 *
 * Maintained by: <tpmdd_devel@lists.sourceforge.net>
 *
 * Device driver for TCG/TCPA TPM (trusted platform module).
 * Specifications at www.trustedcomputinggroup.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, version 2 of the
 * License.
 *
 */
#ifndef __LINUX_TPM_H__
#define __LINUX_TPM_H__

#define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */

struct tpm_chip;
struct trusted_key_payload;
struct trusted_key_options;

enum TPM_OPS_FLAGS {
	TPM_OPS_AUTO_STARTUP = BIT(0),
};

struct tpm_class_ops {
	unsigned int flags;
	const u8 req_complete_mask;
	const u8 req_complete_val;
	bool (*req_canceled)(struct tpm_chip *chip, u8 status);
	int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
	int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
	void (*cancel) (struct tpm_chip *chip);
	u8 (*status) (struct tpm_chip *chip);
	bool (*update_timeouts)(struct tpm_chip *chip,
				unsigned long *timeout_cap);
	int (*request_locality)(struct tpm_chip *chip, int loc);
	void (*relinquish_locality)(struct tpm_chip *chip, int loc);
	void (*clk_enable)(struct tpm_chip *chip, bool value);
};

#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)

extern int tpm_is_tpm2(struct tpm_chip *chip);
extern int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
extern int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
extern int tpm_seal_trusted(struct tpm_chip *chip,
			    struct trusted_key_payload *payload,
			    struct trusted_key_options *options);
extern int tpm_unseal_trusted(struct tpm_chip *chip,
			      struct trusted_key_payload *payload,
			      struct trusted_key_options *options);
#else
static inline int tpm_is_tpm2(struct tpm_chip *chip)
{
	return -ENODEV;
}
static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
{
	return -ENODEV;
}
static inline int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx,
				 const u8 *hash)
{
	return -ENODEV;
}
static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
{
	return -ENODEV;
}
static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
{
	return -ENODEV;
}

static inline int tpm_seal_trusted(struct tpm_chip *chip,
				   struct trusted_key_payload *payload,
				   struct trusted_key_options *options)
{
	return -ENODEV;
}
static inline int tpm_unseal_trusted(struct tpm_chip *chip,
				     struct trusted_key_payload *payload,
				     struct trusted_key_options *options)
{
	return -ENODEV;
}
#endif
#endif