Osmocom Base Transceiver Station (BTS) https://osmocom.org/projects/osmobts
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/* GPLv3+ to read sysmobts-v2 revD or later EEPROM from userspace */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
/* Can read a 16bit at24 eeprom with 8192 byte in storage (24c64) */
static int dump_eeprom(int fd, int out)
{
#define STEP 8192
#define SIZE 8192
uint8_t buf[STEP + 2];
int rc = 0;
int i;
for (i = 0; i < SIZE; i += STEP) {
/* write the address */
buf[0] = i >> 8;
buf[1] = i;
rc = write(fd, buf, 2);
if (rc != 2) {
fprintf(stderr, "writing address failed: %d/%d/%s\n", rc, errno, strerror(errno));
return 1;
}
/* execute step amount of reads */
rc = read(fd, buf, STEP);
if (rc != STEP) {
fprintf(stderr, "Failed to read: %d/%d/%s\n", rc, errno, strerror(errno));
return 1;
}
write(out, buf, STEP);
}
return 0;
}
int main(int argc, char **argv)
{
int i2c_fd, out_fd;
char *filename = "/dev/i2c-1";
char *out_file = "eeprom.out";
int addr = 0x50;
int rc;
i2c_fd = open(filename, O_RDWR);
if (i2c_fd < 0) {
fprintf(stderr, "Failed to open i2c device %d/%d/%s\n",
i2c_fd, errno, strerror(errno));
return EXIT_FAILURE;
}
/* force using that address it is already bound with a driver */
rc = ioctl(i2c_fd, I2C_SLAVE_FORCE, addr);
if (rc < 0) {
fprintf(stderr, "Failed to claim i2c device %d/%d/%s\n",
rc, errno, strerror(errno));
return EXIT_FAILURE;
}
if (argc >= 2)
out_file = argv[1];
out_fd = open(out_file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (out_fd < 0) {
fprintf(stderr, "Failed to open out device %s %d/%d/%s\n",
out_file, rc, errno, strerror(errno));
return EXIT_FAILURE;
}
if (dump_eeprom(i2c_fd, out_fd) != 0) {
unlink(out_file);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}