include/tis.h

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #ifndef __TIS_H
   8 #define __TIS_H
   9
  10 #ifndef CONFIG_DM_TPM
  11
  12 #include <common.h>
  13
  14 /* Low-level interface to access TPM */
  15
  16 /*
  17  * tis_init()
  18  *
  19  * Initialize the TPM device. Returns 0 on success or -1 on
  20  * failure (in case device probing did not succeed).
  21  */
  22 int tis_init(void);
  23
  24 /*
  25  * tis_open()
  26  *
  27  * Requests access to locality 0 for the caller. After all commands have been
  28  * completed the caller is supposed to call tis_close().
  29  *
  30  * Returns 0 on success, -1 on failure.
  31  */
  32 int tis_open(void);
  33
  34 /*
  35  * tis_close()
  36  *
  37  * terminate the currect session with the TPM by releasing the locked
  38  * locality. Returns 0 on success of -1 on failure (in case lock
  39  * removal did not succeed).
  40  */
  41 int tis_close(void);
  42
  43 /*
  44  * tis_sendrecv()
  45  *
  46  * Send the requested data to the TPM and then try to get its response
  47  *
  48  * @sendbuf - buffer of the data to send
  49  * @send_size size of the data to send
  50  * @recvbuf - memory to save the response to
  51  * @recv_len - pointer to the size of the response buffer
  52  *
  53  * Returns 0 on success (and places the number of response bytes at recv_len)
  54  * or -1 on failure.
  55  */
  56 int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf,
  57                         size_t *recv_len);
  58 #endif
  59
  60 #endif /* __TIS_H */