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
  32 struct tpm_chip;
  33
  34 struct 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         bool (*update_timeouts)(struct tpm_chip *chip,
  43                                 unsigned long *timeout_cap);
  44
  45 };
  46
  47 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
  48
  49 extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
  50 extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
  51 extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
  52 extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
  53 #else
  54 static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
  55         return -ENODEV;
  56 }
  57 static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
  58         return -ENODEV;
  59 }
  60 static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
  61         return -ENODEV;
  62 }
  63 static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
  64         return -ENODEV;
  65 }
  66 #endif
  67 #endif