162 lines
3.5 KiB
C
162 lines
3.5 KiB
C
/*
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* Copyright (C) 2011 Infineon Technologies
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*
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* Authors:
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* Peter Huewe <huewe.external@infineon.com>
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*
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* Version: 2.1.1
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*
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* Description:
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* It is based on the Linux kernel driver tpm.c from Leendert van
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* Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
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*
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef _TPM_H_
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#define _TPM_H_
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#include <linux/compiler.h>
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#include "compatibility.h"
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enum tpm_timeout {
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TPM_TIMEOUT = 5, /* msecs */
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};
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/* Size of external transmit buffer (used in tpm_transmit)*/
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#define TPM_BUFSIZE 4096
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/* Index of fields in TPM command buffer */
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#define TPM_CMD_SIZE_BYTE 2
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#define TPM_CMD_ORDINAL_BYTE 6
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/* Index of Count field in TPM response buffer */
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#define TPM_RSP_SIZE_BYTE 2
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#define TPM_RSP_RC_BYTE 6
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struct tpm_chip;
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struct tpm_vendor_specific {
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const u8 req_complete_mask;
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const u8 req_complete_val;
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const u8 req_canceled;
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int irq;
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int (*recv) (struct tpm_chip *, u8 *, size_t);
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int (*send) (struct tpm_chip *, u8 *, size_t);
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void (*cancel) (struct tpm_chip *);
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u8(*status) (struct tpm_chip *);
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int locality;
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unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* msec */
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unsigned long duration[3]; /* msec */
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};
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struct tpm_chip {
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int is_open;
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struct tpm_vendor_specific vendor;
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};
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struct tpm_input_header {
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__be16 tag;
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__be32 length;
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__be32 ordinal;
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} __packed;
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struct tpm_output_header {
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__be16 tag;
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__be32 length;
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__be32 return_code;
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} __packed;
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struct timeout_t {
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__be32 a;
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__be32 b;
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__be32 c;
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__be32 d;
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} __packed;
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struct duration_t {
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__be32 tpm_short;
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__be32 tpm_medium;
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__be32 tpm_long;
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} __packed;
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union cap_t {
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struct timeout_t timeout;
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struct duration_t duration;
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};
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struct tpm_getcap_params_in {
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__be32 cap;
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__be32 subcap_size;
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__be32 subcap;
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} __packed;
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struct tpm_getcap_params_out {
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__be32 cap_size;
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union cap_t cap;
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} __packed;
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union tpm_cmd_header {
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struct tpm_input_header in;
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struct tpm_output_header out;
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};
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union tpm_cmd_params {
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struct tpm_getcap_params_out getcap_out;
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struct tpm_getcap_params_in getcap_in;
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};
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struct tpm_cmd_t {
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union tpm_cmd_header header;
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union tpm_cmd_params params;
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} __packed;
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/* ---------- Interface for TPM vendor ------------ */
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extern struct tpm_chip *tpm_register_hardware(
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const struct tpm_vendor_specific *);
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extern int tpm_vendor_init(uint32_t dev_addr);
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extern void tpm_vendor_cleanup(struct tpm_chip *chip);
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/* ---------- Interface for TDDL ------------------- */
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/*
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* if dev_addr != 0 - redefines TPM device address
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* Returns < 0 on error, 0 on success.
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*/
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extern int tpm_open(uint32_t dev_addr);
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extern void tpm_close(void);
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/*
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* Transmit bufsiz bytes out of buf to TPM and get results back in buf, too.
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* Returns < 0 on error, 0 on success.
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*/
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extern ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz);
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#endif
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