104 lines
2.0 KiB
C
104 lines
2.0 KiB
C
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/*
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* Copyright 2013 Google Inc.
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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; either version 2 of
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* the License, or (at your option) any later version.
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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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#include <stdint.h>
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#include <string.h>
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#include <device/i2c.h>
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#include "tis.h"
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#include "tpm.h"
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static unsigned bus = 0;
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static int opened;
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void tis_set_i2c_bus(unsigned _bus)
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{
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bus = _bus;
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}
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int tis_open(void)
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{
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opened = 1;
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if (tpm_open(bus, CONFIG_DRIVER_TPM_I2C_ADDR)) {
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opened = 0;
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return -1;
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}
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return 0;
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}
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int tis_close(void)
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{
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opened = 0;
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tpm_close();
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return 0;
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}
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int tis_init(void)
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{
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int chip = CONFIG_DRIVER_TPM_I2C_ADDR;
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/*
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* Probe TPM twice; the first probing might fail because TPM is asleep,
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* and the probing can wake up TPM.
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*/
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uint8_t tmp;
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if (!bus)
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return -1;
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if (i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)) &&
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i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)))
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return -1;
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return 0;
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}
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int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
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uint8_t *recvbuf, size_t *rbuf_len)
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{
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uint8_t buf[TPM_BUFSIZE];
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if (!opened && tis_open())
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return -1;
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if (sizeof(buf) < sbuf_size)
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return -1;
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memcpy(buf, sendbuf, sbuf_size);
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int len = tpm_transmit(buf, sbuf_size);
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if (len < 10) {
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*rbuf_len = 0;
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return -1;
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}
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if (len > *rbuf_len) {
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*rbuf_len = len;
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return -1;
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}
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memcpy(recvbuf, buf, len);
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*rbuf_len = len;
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return 0;
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}
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