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 /* 28 * Chip num is this value or a valid tpm idx 29 */ 30 #define TPM_ANY_NUM 0xFFFF 31 32 struct tpm_chip; 33 struct trusted_key_payload; 34 struct trusted_key_options; 35 36 struct 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 51 extern int tpm_is_tpm2(u32 chip_num); 52 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf); 53 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash); 54 extern int tpm_send(u32 chip_num, void *cmd, size_t buflen); 55 extern int tpm_get_random(u32 chip_num, u8 *data, size_t max); 56 extern int tpm_seal_trusted(u32 chip_num, 57 struct trusted_key_payload *payload, 58 struct trusted_key_options *options); 59 extern int tpm_unseal_trusted(u32 chip_num, 60 struct trusted_key_payload *payload, 61 struct trusted_key_options *options); 62 #else 63 static inline int tpm_is_tpm2(u32 chip_num) 64 { 65 return -ENODEV; 66 } 67 static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) { 68 return -ENODEV; 69 } 70 static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) { 71 return -ENODEV; 72 } 73 static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) { 74 return -ENODEV; 75 } 76 static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) { 77 return -ENODEV; 78 } 79 80 static 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 } 86 static 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