/*
   * Copyright (C) 2004,2007,2008 IBM Corporation
   *
   * Authors:
   * Leendert van Doorn <leendert@watson.ibm.com>
   * Dave Safford <safford@watson.ibm.com>
   * Reiner Sailer <sailer@watson.ibm.com>
   * Kylene Hall <kjhall@us.ibm.com>
   * Debora Velarde <dvelarde@us.ibm.com>
   *
   * Maintained by: <tpmdd_devel@lists.sourceforge.net>
   *
   * Device driver for TCG/TCPA TPM (trusted platform module).
   * Specifications at www.trustedcomputinggroup.org
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License as
   * published by the Free Software Foundation, version 2 of the
   * License.
   *
   */
  #ifndef __LINUX_TPM_H__
  #define __LINUX_TPM_H__

  #define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */

  /*
   * Chip num is this value or a valid tpm idx
   */
  #define	TPM_ANY_NUM 0xFFFF

  struct tpm_chip;
  
  struct tpm_class_ops {
  	const u8 req_complete_mask;
  	const u8 req_complete_val;
  	bool (*req_canceled)(struct tpm_chip *chip, u8 status);
  	int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
  	int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
  	void (*cancel) (struct tpm_chip *chip);
  	u8 (*status) (struct tpm_chip *chip);

  	bool (*update_timeouts)(struct tpm_chip *chip,
  				unsigned long *timeout_cap);

  };

  #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)

  
  extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
  extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);

  extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);

  extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);

  #else
  static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
  	return -ENODEV;
  }
  static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
  	return -ENODEV;
  }

  static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
  	return -ENODEV;
  }

  static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
  	return -ENODEV;
  }

  #endif
  #endif