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/*
* Copyright (c) 2011 The Chromium OS Authors.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <tpm.h>
#define MAX_TRANSACTION_SIZE 30
/*
* tpm_write() expects a variable number of parameters: the internal address
* followed by data to write, byte by byte.
*
* Returns 0 on success or -1 on errors (wrong arguments or TPM failure).
*/
static int tpm_process(int argc, char * const argv[], cmd_tbl_t *cmdtp)
{
u8 tpm_buffer[MAX_TRANSACTION_SIZE];
u32 write_size, read_size;
char *p;
int rv = -1;
for (write_size = 0; write_size < argc; write_size++) {
u32 datum = simple_strtoul(argv[write_size], &p, 0);
if (*p || (datum > 0xff)) {
printf("\n%s: bad data value\n\n", argv[write_size]);
cmd_usage(cmdtp);
return rv;
}
tpm_buffer[write_size] = (u8)datum;
}
read_size = sizeof(tpm_buffer);
if (!tis_sendrecv(tpm_buffer, write_size, tpm_buffer, &read_size)) {
int i;
puts("Got TPM response:\n");
for (i = 0; i < read_size; i++)
printf(" %2.2x", tpm_buffer[i]);
puts("\n");
rv = 0;
} else {
puts("tpm command failed\n");
}
return rv;
}
static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int rv = 0;
/*
* Verify that in case it is present, the first argument, it is
* exactly one character in size.
*/
if (argc < 7) {
puts("command should be at least six bytes in size\n");
return -1;
}
if (tis_init()) {
puts("tis_init() failed!\n");
return -1;
}
if (tis_open()) {
puts("tis_open() failed!\n");
return -1;
}
rv = tpm_process(argc - 1, argv + 1, cmdtp);
if (tis_close()) {
puts("tis_close() failed!\n");
rv = -1;
}
return rv;
}
U_BOOT_CMD(tpm, MAX_TRANSACTION_SIZE, 1, do_tpm,
"<byte> [<byte> ...] - write data and read response",
"send arbitrary data (at least 6 bytes) to the TPM "
"device and read the response"
);