| 1 | |
| 2 | * Copyright (C) 2004,2007,2008 IBM Corporation
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| 3 | *
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| 4 | * Authors:
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| 5 | * Leendert van Doorn <[email protected]>
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| 6 | * Dave Safford <[email protected]>
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| 7 | * Reiner Sailer <[email protected]>
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| 8 | * Kylene Hall <[email protected]>
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| 9 | * Debora Velarde <[email protected]>
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| 10 | *
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| 11 | * Maintained by: <[email protected]>
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| 12 | *
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| 13 | * Device driver for TCG/TCPA TPM (trusted platform module).
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| 14 | * Specifications at www.trustedcomputinggroup.org
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| 15 | *
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| 16 | * This program is free software; you can redistribute it and/or
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| 17 | * modify it under the terms of the GNU General Public License as
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| 18 | * published by the Free Software Foundation, version 2 of the
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| 19 | * License.
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| 20 | *
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| 21 |
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| 22 | #ifndef __LINUX_TPM_H__
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| 23 | #define __LINUX_TPM_H__
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| 24 |
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| 25 | #define TPM_DIGEST_SIZE 20
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| 26 |
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| 27 | |
| 28 | * Chip num is this value or a valid tpm idx
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| 29 |
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| 30 | #define TPM_ANY_NUM 0xFFFF
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| 31 |
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| 32 | struct tpm_chip;
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| 33 | struct trusted_key_payload;
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| 34 | struct trusted_key_options;
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| 35 |
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| 36 | enum TPM_OPS_FLAGS {
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| 37 | TPM_OPS_AUTO_STARTUP = BIT(0),
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| 38 | };
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| 39 |
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| 40 | struct tpm_class_ops {
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| 41 | unsigned int flags;
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| 42 | const u8 req_complete_mask;
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| 43 | const u8 req_complete_val;
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| 44 | bool (*req_canceled)(struct tpm_chip *chip, u8 status);
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| 45 | int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
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| 46 | int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
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| 47 | void (*cancel) (struct tpm_chip *chip);
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| 48 | u8 (*status) (struct tpm_chip *chip);
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| 49 | bool (*update_timeouts)(struct tpm_chip *chip,
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| 50 | unsigned long *timeout_cap);
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| 51 |
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| 52 | };
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| 53 |
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| 54 | #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
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| 55 |
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| 56 | extern int tpm_is_tpm2(u32 chip_num);
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| 57 | extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
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| 58 | extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
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| 59 | extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
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| 60 | extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
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| 61 | extern int tpm_seal_trusted(u32 chip_num,
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| 62 | struct trusted_key_payload *payload,
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| 63 | struct trusted_key_options *options);
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| 64 | extern int tpm_unseal_trusted(u32 chip_num,
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| 65 | struct trusted_key_payload *payload,
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| 66 | struct trusted_key_options *options);
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| 67 | #else
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| 68 | static inline int tpm_is_tpm2(u32 chip_num)
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| 69 | {
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| 70 | return -ENODEV;
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| 71 | }
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| 72 | static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
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| 73 | return -ENODEV;
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| 74 | }
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| 75 | static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
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| 76 | return -ENODEV;
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| 77 | }
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| 78 | static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
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| 79 | return -ENODEV;
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| 80 | }
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| 81 | static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
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| 82 | return -ENODEV;
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| 83 | }
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| 84 |
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| 85 | static inline int tpm_seal_trusted(u32 chip_num,
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| 86 | struct trusted_key_payload *payload,
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| 87 | struct trusted_key_options *options)
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| 88 | {
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| 89 | return -ENODEV;
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| 90 | }
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| 91 | static inline int tpm_unseal_trusted(u32 chip_num,
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| 92 | struct trusted_key_payload *payload,
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| 93 | struct trusted_key_options *options)
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| 94 | {
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| 95 | return -ENODEV;
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| 96 | }
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| 97 | #endif
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| 98 | #endif
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