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 struct tpm_chip;
  28 struct trusted_key_payload;
  29 struct trusted_key_options;
  30
  31 enum TPM_OPS_FLAGS {
  32         TPM_OPS_AUTO_STARTUP = BIT(0),
  33 };
  34
  35 struct tpm_class_ops {
  36         unsigned int flags;
  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         int (*request_locality)(struct tpm_chip *chip, int loc);
  47         void (*relinquish_locality)(struct tpm_chip *chip, int loc);
  48         void (*clk_enable)(struct tpm_chip *chip, bool value);
  49 };
  50
  51 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
  52
  53 extern int tpm_is_tpm2(struct tpm_chip *chip);
  54 extern int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
  55 extern int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
  56 extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
  57 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
  58 extern int tpm_seal_trusted(struct tpm_chip *chip,
  59                             struct trusted_key_payload *payload,
  60                             struct trusted_key_options *options);
  61 extern int tpm_unseal_trusted(struct tpm_chip *chip,
  62                               struct trusted_key_payload *payload,
  63                               struct trusted_key_options *options);
  64 #else
  65 static inline int tpm_is_tpm2(struct tpm_chip *chip)
  66 {
  67         return -ENODEV;
  68 }
  69 static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
  70 {
  71         return -ENODEV;
  72 }
  73 static inline int tpm_pcr_extend(struct tpm_chip *chip, int pcr_idx,
  74                                  const u8 *hash)
  75 {
  76         return -ENODEV;
  77 }
  78 static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
  79 {
  80         return -ENODEV;
  81 }
  82 static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
  83 {
  84         return -ENODEV;
  85 }
  86
  87 static inline int tpm_seal_trusted(struct tpm_chip *chip,
  88                                    struct trusted_key_payload *payload,
  89                                    struct trusted_key_options *options)
  90 {
  91         return -ENODEV;
  92 }
  93 static inline int tpm_unseal_trusted(struct tpm_chip *chip,
  94                                      struct trusted_key_payload *payload,
  95                                      struct trusted_key_options *options)
  96 {
  97         return -ENODEV;
  98 }
  99 #endif
 100 #endif