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/*
* flash_{lock,unlock}
*
* utilities for locking/unlocking sectors of flash devices
*/
enum flash_lock_request {
REQUEST_LOCK,
REQUEST_UNLOCK,
REQUEST_ISLOCKED,
};
#ifndef PROGRAM_NAME
#define PROGRAM_NAME "flash_unlock"
#define DEFAULT_REQUEST REQUEST_UNLOCK
#else
#define DEFAULT_REQUEST REQUEST_LOCK
#endif
#include <getopt.h>
#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 "common.h"
#include <mtd/mtd-user.h>
static const char *flash_msg[] = {
[ REQUEST_LOCK ] = "lock",
[ REQUEST_UNLOCK ] = "unlock",
[ REQUEST_ISLOCKED ] = "check lock status",
};
static NORETURN void usage(int status)
{
fprintf(status ? stderr : stdout,
"Utility to lock, unlock, or check the lock status of the flash.\n"
"Default action: %s\n"
"\n"
"Usage: %s [options] [--] <mtd device> [offset [block count]]\n"
"\n"
"Options:\n"
" -h --help Display this help and exit\n"
" -V --version Display version information and exit\n"
" -i --islocked Check if flash region is locked\n"
" -l --lock Lock a region of flash\n"
" -u --unlock Unlock a region of flash\n"
"\n"
" <mtd device> MTD device node or 'mtd:<name>'\n"
"\n"
"If offset is not specified, it defaults to 0.\n"
"If block count is not specified, it defaults to all blocks.\n"
"A block count of -1 means all blocks.\n",
flash_msg[DEFAULT_REQUEST],
PROGRAM_NAME);
exit(status);
}
static const char short_opts[] = "hiluV";
static const struct option long_opts[] = {
{ "help", no_argument, 0, 'h' },
{ "islocked", no_argument, 0, 'i' },
{ "lock", no_argument, 0, 'l' },
{ "unlock", no_argument, 0, 'u' },
{ "version", no_argument, 0, 'V' },
{ NULL, 0, 0, 0 },
};
/* Program arguments */
static const char *dev, *offs_s, *count_s;
static enum flash_lock_request req = DEFAULT_REQUEST;
static void process_args(int argc, char *argv[])
{
int arg_idx;
int req_set = 0;
for (;;) {
int c;
c = getopt_long(argc, argv, short_opts, long_opts, NULL);
if (c == EOF)
break;
switch (c) {
case 'h':
usage(EXIT_SUCCESS);
case 'i':
req = REQUEST_ISLOCKED;
req_set++;
break;
case 'l':
req = REQUEST_LOCK;
req_set++;
break;
case 'u':
req = REQUEST_UNLOCK;
req_set++;
break;
case 'V':
common_print_version();
exit(0);
default:
usage(EXIT_FAILURE);
}
}
if (req_set > 1) {
errmsg("cannot specify more than one lock/unlock/islocked option");
usage(EXIT_FAILURE);
}
arg_idx = optind;
/* Sanity checks */
if (argc - arg_idx < 1) {
errmsg("too few arguments");
usage(EXIT_FAILURE);
} else if (argc - arg_idx > 3) {
errmsg("too many arguments");
usage(EXIT_FAILURE);
}
/* First non-option argument */
dev = mtd_find_dev_node(argv[arg_idx]);
if (!dev) {
errmsg("MTD device not found %s", argv[arg_idx]);
usage(EXIT_FAILURE);
}
arg_idx++;
/* Second non-option argument */
if (arg_idx < argc)
offs_s = argv[arg_idx++];
else
offs_s = NULL;
/* Third non-option argument */
if (arg_idx < argc)
count_s = argv[arg_idx++];
else
count_s = NULL;
}
int main(int argc, char *argv[])
{
int fd, request;
struct mtd_info_user mtdInfo;
struct erase_info_user mtdLockInfo;
long count;
int ret = 0;
process_args(argc, argv);
/* Get the device info to compare to command line sizes */
fd = open(dev, O_RDWR);
if (fd < 0)
sys_errmsg_die("could not open: %s", dev);
if (ioctl(fd, MEMGETINFO, &mtdInfo))
sys_errmsg_die("could not get mtd info: %s", dev);
/* Make sure user options are valid */
if (offs_s) {
mtdLockInfo.start = simple_strtol(offs_s, &ret);
if (ret)
errmsg_die("bad offset");
} else {
mtdLockInfo.start = 0;
}
if (mtdLockInfo.start >= mtdInfo.size)
errmsg_die("%#x is beyond device size %#x",
mtdLockInfo.start, mtdInfo.size);
if (count_s) {
count = simple_strtol(count_s, &ret);
if (ret)
errmsg_die("bad count");
if (count == -1)
mtdLockInfo.length = mtdInfo.size;
else
mtdLockInfo.length = mtdInfo.erasesize * count;
} else {
mtdLockInfo.length = mtdInfo.size;
}
if (mtdLockInfo.start + mtdLockInfo.length > mtdInfo.size)
errmsg_die("range is more than device supports: %#x + %#x > %#x",
mtdLockInfo.start, mtdLockInfo.length, mtdInfo.size);
/* Finally do the operation */
switch (req) {
case REQUEST_LOCK:
request = MEMLOCK;
break;
case REQUEST_UNLOCK:
request = MEMUNLOCK;
break;
case REQUEST_ISLOCKED:
request = MEMISLOCKED;
break;
default:
errmsg_die("unknown request type: %d", req);
break;
}
ret = ioctl(fd, request, &mtdLockInfo);
if (ret < 0)
sys_errmsg_die("could not %s device: %s\n",
flash_msg[req], dev);
if (req == REQUEST_ISLOCKED) {
printf("Device: %s\n", dev);
printf("Start: %#0x\n", mtdLockInfo.start);
printf("Len: %#0x\n", mtdLockInfo.length);
printf("Lock status: %s\n", ret ? "locked" : "unlocked");
printf("Return code: %d\n", ret);
}
return 0;
}
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