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/*
* flash_{lock,unlock}
*
* utilities for locking/unlocking sectors of flash devices
*/
#ifndef PROGRAM_NAME
#define PROGRAM_NAME "flash_unlock"
#define FLASH_MSG "unlock"
#define FLASH_UNLOCK 1
#else
#define FLASH_MSG "lock"
#define FLASH_UNLOCK 0
#endif
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <string.h>
#include <mtd/mtd-user.h>
int main(int argc, char *argv[])
{
int fd, request;
struct mtd_info_user mtdInfo;
struct erase_info_user mtdLockInfo;
int count;
/*
* Parse command line options
*/
if (argc < 2) {
fprintf(stderr, "USAGE: %s <mtd device> <offset> <block count>\n", PROGRAM_NAME);
exit(1);
} else if (strncmp(argv[1], "/dev/mtd", 8) != 0) {
fprintf(stderr, "'%s' is not a MTD device. Must specify mtd device: /dev/mtd?\n", argv[1]);
exit(1);
}
fd = open(argv[1], O_RDWR);
if (fd < 0) {
fprintf(stderr, "Could not open mtd device: %s\n", argv[1]);
exit(1);
}
if (ioctl(fd, MEMGETINFO, &mtdInfo)) {
fprintf(stderr, "Could not get MTD device info from %s\n", argv[1]);
close(fd);
exit(1);
}
if (argc > 2)
mtdLockInfo.start = strtol(argv[2], NULL, 0);
else
mtdLockInfo.start = 0;
if (mtdLockInfo.start > mtdInfo.size) {
fprintf(stderr, "%#x is beyond device size %#x\n",
mtdLockInfo.start, mtdInfo.size);
close(fd);
exit(1);
}
if (argc > 3) {
count = strtol(argv[3], NULL, 0);
if (count == -1)
mtdLockInfo.length = mtdInfo.size - mtdInfo.erasesize;
else
mtdLockInfo.length = mtdInfo.erasesize * count;
} else {
mtdLockInfo.length = mtdInfo.size - mtdInfo.erasesize;
}
if (mtdLockInfo.start + mtdLockInfo.length > mtdInfo.size) {
fprintf(stderr, "%s range is more than device supports\n", FLASH_MSG);
exit(1);
}
request = FLASH_UNLOCK ? MEMUNLOCK : MEMLOCK;
if (ioctl(fd, request, &mtdLockInfo)) {
fprintf(stderr, "Could not %s MTD device: %s\n",
FLASH_MSG, argv[1]);
close(fd);
exit(1);
}
return 0;
}
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