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
  36enum TPM_OPS_FLAGS {
  37        TPM_OPS_AUTO_STARTUP = BIT(0),
  38};
  39
  40struct tpm_class_ops {
  41        unsigned int flags;
  42        const u8 req_complete_mask;
  43        const u8 req_complete_val;
  44        bool (*req_canceled)(struct tpm_chip *chip, u8 status);
  45        int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
  46        int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
  47        void (*cancel) (struct tpm_chip *chip);
  48        u8 (*status) (struct tpm_chip *chip);
  49        bool (*update_timeouts)(struct tpm_chip *chip,
  50                                unsigned long *timeout_cap);
  51
  52};
  53
  54#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
  55
  56extern int tpm_is_tpm2(u32 chip_num);
  57extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
  58extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
  59extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
  60extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
  61extern int tpm_seal_trusted(u32 chip_num,
  62                            struct trusted_key_payload *payload,
  63                            struct trusted_key_options *options);
  64extern int tpm_unseal_trusted(u32 chip_num,
  65                              struct trusted_key_payload *payload,
  66                              struct trusted_key_options *options);
  67#else
  68static inline int tpm_is_tpm2(u32 chip_num)
  69{
  70        return -ENODEV;
  71}
  72static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
  73        return -ENODEV;
  74}
  75static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
  76        return -ENODEV;
  77}
  78static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
  79        return -ENODEV;
  80}
  81static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
  82        return -ENODEV;
  83}
  84
  85static inline int tpm_seal_trusted(u32 chip_num,
  86                                   struct trusted_key_payload *payload,
  87                                   struct trusted_key_options *options)
  88{
  89        return -ENODEV;
  90}
  91static inline int tpm_unseal_trusted(u32 chip_num,
  92                                     struct trusted_key_payload *payload,
  93                                     struct trusted_key_options *options)
  94{
  95        return -ENODEV;
  96}
  97#endif
  98#endif
  99