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1 /*
2  * Copyright (C) 2004,2007,2008 IBM Corporation
3  *
4  * Authors:
5  * Leendert van Doorn <[email protected]>
6  * Dave Safford <[email protected]>
7  * Reiner Sailer <[email protected]>
8  * Kylene Hall <[email protected]>
9  * Debora Velarde <[email protected]>
10  *
11  * Maintained by: <[email protected]>
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 struct tpm_chip;
28 struct trusted_key_payload;
29 struct trusted_key_options;
30
31 enum TPM_OPS_FLAGS {
32         TPM_OPS_AUTO_STARTUP = BIT(0),
33 };
34
35 struct tpm_class_ops {
36         unsigned int flags;
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         int (*request_locality)(struct tpm_chip *chip, int loc);
47         void (*relinquish_locality)(struct tpm_chip *chip, int loc);
48         void (*clk_enable)(struct tpm_chip *chip, bool value);
49 };
50
51 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
52
53 extern int tpm_is_tpm2(struct tpm_chip *chip);
54 extern int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
55 extern int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
56 extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
57 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
58 extern int tpm_seal_trusted(struct tpm_chip *chip,
59                             struct trusted_key_payload *payload,
60                             struct trusted_key_options *options);
61 extern int tpm_unseal_trusted(struct tpm_chip *chip,
62                               struct trusted_key_payload *payload,
63                               struct trusted_key_options *options);
64 #else
65 static inline int tpm_is_tpm2(struct tpm_chip *chip)
66 {
67         return -ENODEV;
68 }
69 static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
70 {
71         return -ENODEV;
72 }
73 static inline int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx,
74                                  const u8 *hash)
75 {
76         return -ENODEV;
77 }
78 static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
79 {
80         return -ENODEV;
81 }
82 static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
83 {
84         return -ENODEV;
85 }
86
87 static inline int tpm_seal_trusted(struct tpm_chip *chip,
88                                    struct trusted_key_payload *payload,
89                                    struct trusted_key_options *options)
90 {
91         return -ENODEV;
92 }
93 static inline int tpm_unseal_trusted(struct tpm_chip *chip,
94                                      struct trusted_key_payload *payload,
95                                      struct trusted_key_options *options)
96 {
97         return -ENODEV;
98 }
99 #endif
100 #endif
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