2 * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <sys/mount.h>
15 #include <sys/types.h>
18 #include <asm/byteorder.h>
22 #include <mtd/mtd-user.h>
24 #include "libfstools.h"
37 static struct driver mtd_driver;
39 static int mtd_open(const char *mtd, int block)
43 int i, ret, flags = O_RDWR | O_SYNC;
45 if ((fp = fopen("/proc/mtd", "r"))) {
46 while (fgets(dev, sizeof(dev), fp)) {
47 if (sscanf(dev, "mtd%d:", &i) && strstr(dev, mtd)) {
48 snprintf(dev, sizeof(dev), "/dev/mtd%s/%d", (block ? "block" : ""), i);
49 ret = open(dev, flags);
51 snprintf(dev, sizeof(dev), "/dev/mtd%s%d", (block ? "block" : ""), i);
52 ret = open(dev, flags);
61 return open(mtd, flags);
64 static void mtd_volume_close(struct mtd_volume *p)
73 static int mtd_volume_load(struct mtd_volume *p)
75 struct volume *v = &p->v;
76 struct mtd_info_user mtdInfo;
77 struct erase_info_user mtdLockInfo;
85 p->fd = mtd_open(p->chr, 0);
88 ULOG_ERR("Could not open mtd device: %s\n", p->chr);
92 if (ioctl(p->fd, MEMGETINFO, &mtdInfo)) {
94 ULOG_ERR("Could not get MTD device info from %s\n", p->chr);
98 v->size = mtdInfo.size;
99 v->block_size = mtdInfo.erasesize;
100 switch (mtdInfo.type) {
111 v->type = UNKNOWN_TYPE;
115 mtdLockInfo.start = 0;
116 mtdLockInfo.length = v->size;
117 ioctl(p->fd, MEMUNLOCK, &mtdLockInfo);
122 static char* mtd_find_index(char *name)
124 FILE *fp = fopen("/proc/mtd", "r");
125 static char line[256];
131 while (!index && fgets(line, sizeof(line), fp)) {
134 if ((ret = strstr(line, name)) && (ret[strlen(name)] == '"')) {
135 char *eol = strstr(line, ":");
150 static struct volume *mtd_volume_find(char *name)
152 char *idx = mtd_find_index(name);
153 struct mtd_volume *p;
160 p = calloc(1, sizeof(struct mtd_volume));
165 v->name = strdup(name);
166 v->drv = &mtd_driver;
169 snprintf(buffer, sizeof(buffer), "/dev/mtdblock%s", idx);
170 v->blk = strdup(buffer);
172 snprintf(buffer, sizeof(buffer), "/dev/mtd%s", idx);
173 p->chr = strdup(buffer);
175 if (mtd_volume_load(p)) {
176 ULOG_ERR("reading %s failed\n", v->name);
184 static int mtd_volume_identify(struct volume *v)
186 struct mtd_volume *p = container_of(v, struct mtd_volume, v);;
191 if (mtd_volume_load(p)) {
192 ULOG_ERR("reading %s failed\n", v->name);
196 sz = read(p->fd, &deadc0de, sizeof(deadc0de));
198 if (sz != sizeof(deadc0de)) {
199 ULOG_ERR("reading %s failed: %s\n", v->name, strerror(errno));
203 if (deadc0de == __be32_to_cpu(0x4f575254))
206 deadc0de = __be32_to_cpu(deadc0de);
207 if (deadc0de == 0xdeadc0de) {
211 jffs2 = __be16_to_cpu(deadc0de >> 16);
212 if (jffs2 == 0x1985) {
216 if (v->type == UBIVOLUME && deadc0de == 0xffffffff) {
223 static int mtd_volume_erase(struct volume *v, int offset, int len)
225 struct mtd_volume *p = container_of(v, struct mtd_volume, v);;
226 struct erase_info_user eiu;
227 int first_block, num_blocks;
229 if (mtd_volume_load(p))
232 if (offset % v->block_size || len % v->block_size) {
233 ULOG_ERR("mtd erase needs to be block aligned\n");
237 first_block = offset / v->block_size;
238 num_blocks = len / v->block_size;
239 eiu.length = v->block_size;
241 for (eiu.start = first_block * v->block_size;
242 eiu.start < v->size && eiu.start < (first_block + num_blocks) * v->block_size;
243 eiu.start += v->block_size) {
244 ULOG_INFO("erasing %x %x\n", eiu.start, v->block_size);
245 ioctl(p->fd, MEMUNLOCK, &eiu);
246 if (ioctl(p->fd, MEMERASE, &eiu))
247 ULOG_ERR("Failed to erase block at 0x%x\n", eiu.start);
255 static int mtd_volume_erase_all(struct volume *v)
257 struct mtd_volume *p = container_of(v, struct mtd_volume, v);;
259 mtd_volume_erase(v, 0, v->size);
265 static int mtd_volume_init(struct volume *v)
267 struct mtd_volume *p = container_of(v, struct mtd_volume, v);;
268 struct mtd_info_user mtdinfo;
271 if (mtd_volume_load(p))
274 ret = ioctl(p->fd, MEMGETINFO, &mtdinfo);
276 ULOG_ERR("ioctl(%d, MEMGETINFO) failed: %s\n", p->fd, strerror(errno));
278 struct erase_info_user mtdlock;
281 mtdlock.length = mtdinfo.size;
282 ioctl(p->fd, MEMUNLOCK, &mtdlock);
288 static int mtd_volume_read(struct volume *v, void *buf, int offset, int length)
290 struct mtd_volume *p = container_of(v, struct mtd_volume, v);;
292 if (mtd_volume_load(p))
295 if (lseek(p->fd, offset, SEEK_SET) == (off_t) -1) {
296 ULOG_ERR("lseek/read failed\n");
300 if (read(p->fd, buf, length) == -1) {
301 ULOG_ERR("read failed\n");
308 static int mtd_volume_write(struct volume *v, void *buf, int offset, int length)
310 struct mtd_volume *p = container_of(v, struct mtd_volume, v);;
312 if (mtd_volume_load(p))
315 if (lseek(p->fd, offset, SEEK_SET) == (off_t) -1) {
316 ULOG_ERR("lseek/write failed at offset %d\n", offset);
321 if (write(p->fd, buf, length) == -1) {
322 ULOG_ERR("write failed\n");
329 static struct driver mtd_driver = {
331 .find = mtd_volume_find,
332 .init = mtd_volume_init,
333 .erase = mtd_volume_erase,
334 .erase_all = mtd_volume_erase_all,
335 .read = mtd_volume_read,
336 .write = mtd_volume_write,
337 .identify = mtd_volume_identify,