LXR linux/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#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};
  43
  44#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
  45
  46extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
  47extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
  48extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
  49extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
  50#else
  51static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
  52        return -ENODEV;
  53}
  54static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
  55        return -ENODEV;
  56}
  57static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
  58        return -ENODEV;
  59}
  60static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
  61        return -ENODEV;
  62}
  63#endif
  64#endif
  65