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 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE) 33 34 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf); 35 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash); 36 extern int tpm_send(u32 chip_num, void *cmd, size_t buflen); 37 extern int tpm_get_random(u32 chip_num, u8 *data, size_t max); 38 #else 39 static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) { 40 return -ENODEV; 41 } 42 static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) { 43 return -ENODEV; 44 } 45 static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) { 46 return -ENODEV; 47 } 48 static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) { 49 return -ENODEV; 50 } 51 #endif 52 #endif 53