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 int (*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 101