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 (*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 68 static inline int tpm_is_tpm2(struct tpm_chip *chip) 69 { 70 return -ENODEV; 71 } 72 static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) 73 { 74 return -ENODEV; 75 } 76 static inline int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, 77 const u8 *hash) 78 { 79 return -ENODEV; 80 } 81 static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen) 82 { 83 return -ENODEV; 84 } 85 static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max) 86 { 87 return -ENODEV; 88 } 89 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 } 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 } 102 static inline struct tpm_chip *tpm_default_chip(void) 103 { 104 return NULL; 105 } 106 #endif 107 #endif 108