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