include/linux/tpm.h

   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 /*
  26  * Chip num is this value or a valid tpm idx
  27  */
  28 #define TPM_ANY_NUM 0xFFFF
  29
  30 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
  31
  32 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
  33 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
  34 extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
  35 extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
  36 #else
  37 static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
  38         return -ENODEV;
  39 }
  40 static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
  41         return -ENODEV;
  42 }
  43 static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
  44         return -ENODEV;
  45 }
  46 static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
  47         return -ENODEV;
  48 }
  49 #endif
  50 #endif