include/tis.h

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #ifndef __TIS_H
  24 #define __TIS_H
  25
  26 #include <common.h>
  27
  28 /* Low-level interface to access TPM */
  29
  30 /*
  31  * tis_init()
  32  *
  33  * Initialize the TPM device. Returns 0 on success or -1 on
  34  * failure (in case device probing did not succeed).
  35  */
  36 int tis_init(void);
  37
  38 /*
  39  * tis_open()
  40  *
  41  * Requests access to locality 0 for the caller. After all commands have been
  42  * completed the caller is supposed to call tis_close().
  43  *
  44  * Returns 0 on success, -1 on failure.
  45  */
  46 int tis_open(void);
  47
  48 /*
  49  * tis_close()
  50  *
  51  * terminate the currect session with the TPM by releasing the locked
  52  * locality. Returns 0 on success of -1 on failure (in case lock
  53  * removal did not succeed).
  54  */
  55 int tis_close(void);
  56
  57 /*
  58  * tis_sendrecv()
  59  *
  60  * Send the requested data to the TPM and then try to get its response
  61  *
  62  * @sendbuf - buffer of the data to send
  63  * @send_size size of the data to send
  64  * @recvbuf - memory to save the response to
  65  * @recv_len - pointer to the size of the response buffer
  66  *
  67  * Returns 0 on success (and places the number of response bytes at recv_len)
  68  * or -1 on failure.
  69  */
  70 int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf,
  71                         size_t *recv_len);
  72
  73 #endif /* __TIS_H */