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;
  33struct trusted_key_payload;
  34struct trusted_key_options;
  35
  36struct tpm_class_ops {
  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
  47};
  48
  49#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
  50
  51extern int tpm_is_tpm2(u32 chip_num);
  52extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
  53extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
  54extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
  55extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
  56extern int tpm_seal_trusted(u32 chip_num,
  57                            struct trusted_key_payload *payload,
  58                            struct trusted_key_options *options);
  59extern int tpm_unseal_trusted(u32 chip_num,
  60                              struct trusted_key_payload *payload,
  61                              struct trusted_key_options *options);
  62#else
  63static inline int tpm_is_tpm2(u32 chip_num)
  64{
  65        return -ENODEV;
  66}
  67static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
  68        return -ENODEV;
  69}
  70static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
  71        return -ENODEV;
  72}
  73static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
  74        return -ENODEV;
  75}
  76static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
  77        return -ENODEV;
  78}
  79
  80static inline int tpm_seal_trusted(u32 chip_num,
  81                                   struct trusted_key_payload *payload,
  82                                   struct trusted_key_options *options)
  83{
  84        return -ENODEV;
  85}
  86static inline int tpm_unseal_trusted(u32 chip_num,
  87                                     struct trusted_key_payload *payload,
  88                                     struct trusted_key_options *options)
  89{
  90        return -ENODEV;
  91}
  92#endif
  93#endif
  94