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/*
* Copyright 2014-present Facebook. All Rights Reserved.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#define SERIAL_LEN 17
usage()
{
fprintf(stderr, "Usage: po-eeprom filename [filename...]\n"
"\twhere filename is the location of the PowerOne EEPROM, likely\n"
"\t/sys/bus/i2c/drivers/at24/7-0051/eeprom or\n"
"\t/sys/bus/i2c/drivers/at24/7-0052/eeprom\n");
exit(2);
}
int safe_read(int fd, void *buf, size_t size, char *msg)
{
if (read(fd, buf, size) != size) {
perror(msg);
exit(3);
}
}
int main(int argc, char **argv)
{
int fd;
int file = 1;
uint8_t size;
uint8_t junk;
uint16_t crc;
char serial[SERIAL_LEN + 1];
if (argc < 2)
usage();
while (file < argc) {
fd = open(argv[file], O_RDONLY);
if (fd < 0) {
fprintf(stderr, "Couldn't open %s for EEPROM reading\n", argv[1]);
exit(1);
}
safe_read(fd, &size, sizeof(size), "read size");
safe_read(fd, &junk, sizeof(junk), "read junk");
/*
* Should probably check CRC here, PowerOne provided some code where
* it looks like a pretty standard CCITT CRC16.
*/
safe_read(fd, &crc, sizeof(crc), "read CRC len");
safe_read(fd, serial, SERIAL_LEN, "read serial number");
serial[SERIAL_LEN] = 0;
printf("Serial number: %s\n", serial);
close(fd);
file++;
}
}
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