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/* 28 * Chip num is this value or a valid tpm idx 29 */ 30#define TPM_ANY_NUM 0xFFFF 31 32struct tpm_chip; 33 34struct tpm_class_ops { 35 const u8 req_complete_mask; 36 const u8 req_complete_val; 37 bool (*req_canceled)(struct tpm_chip *chip, u8 status); 38 int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len); 39 int (*send) (struct tpm_chip *chip, u8 *buf, size_t len); 40 void (*cancel) (struct tpm_chip *chip); 41 u8 (*status) (struct tpm_chip *chip); 42 bool (*update_timeouts)(struct tpm_chip *chip, 43 unsigned long *timeout_cap); 44 45}; 46 47#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE) 48 49extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf); 50extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash); 51extern int tpm_send(u32 chip_num, void *cmd, size_t buflen); 52extern int tpm_get_random(u32 chip_num, u8 *data, size_t max); 53#else 54static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) { 55 return -ENODEV; 56} 57static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) { 58 return -ENODEV; 59} 60static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) { 61 return -ENODEV; 62} 63static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) { 64 return -ENODEV; 65} 66#endif 67#endif 68