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 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 (*go_idle)(struct tpm_chip *chip);
47 int (*cmd_ready)(struct tpm_chip *chip);
48 int (*request_locality)(struct tpm_chip *chip, int loc);
49 int (*relinquish_locality)(struct tpm_chip *chip, int loc);
50 void (*clk_enable)(struct tpm_chip *chip, bool value);
51 };
52
53 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
54
55 extern int tpm_is_tpm2(struct tpm_chip *chip);
56 extern int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
57 extern int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
58 extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
59 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
60 extern int tpm_seal_trusted(struct tpm_chip *chip,
61 struct trusted_key_payload *payload,
62 struct trusted_key_options *options);
63 extern int tpm_unseal_trusted(struct tpm_chip *chip,
64 struct trusted_key_payload *payload,
65 struct trusted_key_options *options);
66 extern struct tpm_chip *tpm_default_chip(void);
67 #else
tpm_is_tpm2(struct tpm_chip * chip)68 static inline int tpm_is_tpm2(struct tpm_chip *chip)
69 {
70 return -ENODEV;
71 }
tpm_pcr_read(struct tpm_chip * chip,int pcr_idx,u8 * res_buf)72 static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
73 {
74 return -ENODEV;
75 }
tpm_pcr_extend(struct tpm_chip * chip,int pcr_idx,const u8 * hash)76 static inline int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx,
77 const u8 *hash)
78 {
79 return -ENODEV;
80 }
tpm_send(struct tpm_chip * chip,void * cmd,size_t buflen)81 static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
82 {
83 return -ENODEV;
84 }
tpm_get_random(struct tpm_chip * chip,u8 * data,size_t max)85 static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
86 {
87 return -ENODEV;
88 }
89
tpm_seal_trusted(struct tpm_chip * chip,struct trusted_key_payload * payload,struct trusted_key_options * options)90 static inline int tpm_seal_trusted(struct tpm_chip *chip,
91 struct trusted_key_payload *payload,
92 struct trusted_key_options *options)
93 {
94 return -ENODEV;
95 }
tpm_unseal_trusted(struct tpm_chip * chip,struct trusted_key_payload * payload,struct trusted_key_options * options)96 static inline int tpm_unseal_trusted(struct tpm_chip *chip,
97 struct trusted_key_payload *payload,
98 struct trusted_key_options *options)
99 {
100 return -ENODEV;
101 }
tpm_default_chip(void)102 static inline struct tpm_chip *tpm_default_chip(void)
103 {
104 return NULL;
105 }
106 #endif
107 #endif
108