summaryrefslogtreecommitdiff
path: root/flash_unlock.c
blob: be09347faa9291ac0710874f7227139757036181 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/*
 * flash_{lock,unlock}
 *
 * utilities for locking/unlocking sectors of flash devices
 */

enum flash_lock_request {
	REQUEST_LOCK,
	REQUEST_UNLOCK,
};

#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",
};

static void usage(int status)
{
	fprintf(status ? stderr : stdout,
		"Utility to lock or unlock the flash. 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"
		"            --version           Display version information and exit\n"
		" -l         --lock              Lock a region of flash\n"
		" -u         --unlock            Unlock a region of flash\n"
		"\n"
		"If offset is not specified, it defaults to 0.\n"
		"If block count is not specified, it defaults to all blocks.\n",
		flash_msg[DEFAULT_REQUEST],
		PROGRAM_NAME);
	exit(status);
}

static const char short_opts[] = "hlu";
static const struct option long_opts[] = {
	{ "help",	no_argument,	0, 'h' },
	{ "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(0);
			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(1);
			break;
		}
	}

	if (req_set > 1) {
		errmsg("cannot specify more than one lock/unlock option");
		usage(1);
	}

	arg_idx = optind;

	/* Sanity checks */
	if (argc - arg_idx < 1) {
		errmsg("too few arguments");
		usage(1);
	} else if (argc - arg_idx > 3) {
		errmsg("too many arguments");
		usage(1);
	}

	/* First non-option argument */
	dev = argv[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;
	int count;

	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 = strtol(offs_s, NULL, 0);
	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 = strtol(count_s, NULL, 0);
		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;
	default:
		errmsg_die("unknown request type: %d", req);
		break;
	}
	if (ioctl(fd, request, &mtdLockInfo))
		sys_errmsg_die("could not %s device: %s\n",
				flash_msg[req], dev);

	return 0;
}