| 1 | /* |
| 2 | * Copyright (C) 2009 Nokia Corporation |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 12 | * the GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | * |
| 18 | * Author: Artem Bityutskiy |
| 19 | * |
| 20 | * This file is part of the MTD library. Implements pre-2.6.30 kernels support, |
| 21 | * where MTD did not have sysfs interface. The main limitation of the old |
| 22 | * kernels was that the sub-page size was not exported to user-space, so it was |
| 23 | * not possible to get sub-page size. |
| 24 | */ |
| 25 | |
| 26 | /* Imported from mtd-utils by dehrenberg */ |
| 27 | |
| 28 | #include <limits.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <unistd.h> |
| 31 | #include <stdlib.h> |
| 32 | #include <errno.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <sys/ioctl.h> |
| 36 | #include <mtd/mtd-user.h> |
| 37 | |
| 38 | #include "libmtd.h" |
| 39 | #include "libmtd_int.h" |
| 40 | #include "libmtd_common.h" |
| 41 | |
| 42 | #define MTD_PROC_FILE "/proc/mtd" |
| 43 | #define MTD_DEV_PATT "/dev/mtd%d" |
| 44 | #define MTD_DEV_MAJOR 90 |
| 45 | |
| 46 | #define PROC_MTD_FIRST "dev: size erasesize name\n" |
| 47 | #define PROC_MTD_FIRST_LEN (sizeof(PROC_MTD_FIRST) - 1) |
| 48 | #define PROC_MTD_MAX_LEN 4096 |
| 49 | #define PROC_MTD_PATT "mtd%d: %llx %x" |
| 50 | |
| 51 | /** |
| 52 | * struct proc_parse_info - /proc/mtd parsing information. |
| 53 | * @mtd_num: MTD device number |
| 54 | * @size: device size |
| 55 | * @eb_size: eraseblock size |
| 56 | * @name: device name |
| 57 | * @buf: contents of /proc/mtd |
| 58 | * @data_size: how much data was read into @buf |
| 59 | * @pos: next string in @buf to parse |
| 60 | */ |
| 61 | struct proc_parse_info |
| 62 | { |
| 63 | int mtd_num; |
| 64 | long long size; |
| 65 | char name[MTD_NAME_MAX + 1]; |
| 66 | int eb_size; |
| 67 | char *buf; |
| 68 | int data_size; |
| 69 | char *next; |
| 70 | }; |
| 71 | |
| 72 | static int proc_parse_start(struct proc_parse_info *pi) |
| 73 | { |
| 74 | int fd, ret; |
| 75 | |
| 76 | fd = open(MTD_PROC_FILE, O_RDONLY); |
| 77 | if (fd == -1) |
| 78 | return -1; |
| 79 | |
| 80 | pi->buf = xmalloc(PROC_MTD_MAX_LEN); |
| 81 | |
| 82 | ret = read(fd, pi->buf, PROC_MTD_MAX_LEN); |
| 83 | if (ret == -1) { |
| 84 | sys_errmsg("cannot read \"%s\"", MTD_PROC_FILE); |
| 85 | goto out_free; |
| 86 | } |
| 87 | |
| 88 | if (ret < PROC_MTD_FIRST_LEN || |
| 89 | memcmp(pi->buf, PROC_MTD_FIRST, PROC_MTD_FIRST_LEN)) { |
| 90 | errmsg("\"%s\" does not start with \"%s\"", MTD_PROC_FILE, |
| 91 | PROC_MTD_FIRST); |
| 92 | goto out_free; |
| 93 | } |
| 94 | |
| 95 | pi->data_size = ret; |
| 96 | pi->next = pi->buf + PROC_MTD_FIRST_LEN; |
| 97 | |
| 98 | close(fd); |
| 99 | return 0; |
| 100 | |
| 101 | out_free: |
| 102 | free(pi->buf); |
| 103 | close(fd); |
| 104 | return -1; |
| 105 | } |
| 106 | |
| 107 | static int proc_parse_next(struct proc_parse_info *pi) |
| 108 | { |
| 109 | int ret, len, pos = pi->next - pi->buf; |
| 110 | char *p, *p1; |
| 111 | |
| 112 | if (pos >= pi->data_size) { |
| 113 | free(pi->buf); |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | ret = sscanf(pi->next, PROC_MTD_PATT, &pi->mtd_num, &pi->size, |
| 118 | &pi->eb_size); |
| 119 | if (ret != 3) |
| 120 | return errmsg("\"%s\" pattern not found", PROC_MTD_PATT); |
| 121 | |
| 122 | p = memchr(pi->next, '\"', pi->data_size - pos); |
| 123 | if (!p) |
| 124 | return errmsg("opening \" not found"); |
| 125 | p += 1; |
| 126 | pos = p - pi->buf; |
| 127 | if (pos >= pi->data_size) |
| 128 | return errmsg("opening \" not found"); |
| 129 | |
| 130 | p1 = memchr(p, '\"', pi->data_size - pos); |
| 131 | if (!p1) |
| 132 | return errmsg("closing \" not found"); |
| 133 | pos = p1 - pi->buf; |
| 134 | if (pos >= pi->data_size) |
| 135 | return errmsg("closing \" not found"); |
| 136 | |
| 137 | len = p1 - p; |
| 138 | if (len > MTD_NAME_MAX) |
| 139 | return errmsg("too long mtd%d device name", pi->mtd_num); |
| 140 | |
| 141 | memcpy(pi->name, p, len); |
| 142 | pi->name[len] = '\0'; |
| 143 | |
| 144 | if (p1[1] != '\n') |
| 145 | return errmsg("opening \"\n\" not found"); |
| 146 | pi->next = p1 + 2; |
| 147 | return 1; |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * legacy_libmtd_open - legacy version of 'libmtd_open()'. |
| 152 | * |
| 153 | * This function is just checks that MTD is present in the system. Returns |
| 154 | * zero in case of success and %-1 in case of failure. In case of failure, |
| 155 | * errno contains zero if MTD is not present in the system, or contains the |
| 156 | * error code if a real error happened. This is similar to the 'libmtd_open()' |
| 157 | * return conventions. |
| 158 | */ |
| 159 | int legacy_libmtd_open(void) |
| 160 | { |
| 161 | int fd; |
| 162 | |
| 163 | fd = open(MTD_PROC_FILE, O_RDONLY); |
| 164 | if (fd == -1) { |
| 165 | if (errno == ENOENT) |
| 166 | errno = 0; |
| 167 | return -1; |
| 168 | } |
| 169 | |
| 170 | close(fd); |
| 171 | return 0; |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * legacy_dev_presentl - legacy version of 'mtd_dev_present()'. |
| 176 | * @info: the MTD device information is returned here |
| 177 | * |
| 178 | * When the kernel does not provide sysfs files for the MTD subsystem, |
| 179 | * fall-back to parsing the /proc/mtd file to determine whether an mtd device |
| 180 | * number @mtd_num is present. |
| 181 | */ |
| 182 | int legacy_dev_present(int mtd_num) |
| 183 | { |
| 184 | int ret; |
| 185 | struct proc_parse_info pi; |
| 186 | |
| 187 | ret = proc_parse_start(&pi); |
| 188 | if (ret) |
| 189 | return -1; |
| 190 | |
| 191 | while (proc_parse_next(&pi)) { |
| 192 | if (pi.mtd_num == mtd_num) |
| 193 | return 1; |
| 194 | } |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * legacy_mtd_get_info - legacy version of 'mtd_get_info()'. |
| 201 | * @info: the MTD device information is returned here |
| 202 | * |
| 203 | * This function is similar to 'mtd_get_info()' and has the same conventions. |
| 204 | */ |
| 205 | int legacy_mtd_get_info(struct mtd_info *info) |
| 206 | { |
| 207 | int ret; |
| 208 | struct proc_parse_info pi; |
| 209 | |
| 210 | ret = proc_parse_start(&pi); |
| 211 | if (ret) |
| 212 | return -1; |
| 213 | |
| 214 | info->lowest_mtd_num = INT_MAX; |
| 215 | while (proc_parse_next(&pi)) { |
| 216 | info->mtd_dev_cnt += 1; |
| 217 | if (pi.mtd_num > info->highest_mtd_num) |
| 218 | info->highest_mtd_num = pi.mtd_num; |
| 219 | if (pi.mtd_num < info->lowest_mtd_num) |
| 220 | info->lowest_mtd_num = pi.mtd_num; |
| 221 | } |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | /** |
| 227 | * legacy_get_dev_info - legacy version of 'mtd_get_dev_info()'. |
| 228 | * @node: name of the MTD device node |
| 229 | * @mtd: the MTD device information is returned here |
| 230 | * |
| 231 | * This function is similar to 'mtd_get_dev_info()' and has the same |
| 232 | * conventions. |
| 233 | */ |
| 234 | int legacy_get_dev_info(const char *node, struct mtd_dev_info *mtd) |
| 235 | { |
| 236 | struct stat st; |
| 237 | struct mtd_info_user ui; |
| 238 | int fd, ret; |
| 239 | loff_t offs = 0; |
| 240 | struct proc_parse_info pi; |
| 241 | |
| 242 | if (stat(node, &st)) { |
| 243 | sys_errmsg("cannot open \"%s\"", node); |
| 244 | if (errno == ENOENT) |
| 245 | normsg("MTD subsystem is old and does not support " |
| 246 | "sysfs, so MTD character device nodes have " |
| 247 | "to exist"); |
| 248 | } |
| 249 | |
| 250 | if (!S_ISCHR(st.st_mode)) { |
| 251 | errno = EINVAL; |
| 252 | return errmsg("\"%s\" is not a character device", node); |
| 253 | } |
| 254 | |
| 255 | memset(mtd, '\0', sizeof(struct mtd_dev_info)); |
| 256 | mtd->major = major(st.st_rdev); |
| 257 | mtd->minor = minor(st.st_rdev); |
| 258 | |
| 259 | if (mtd->major != MTD_DEV_MAJOR) { |
| 260 | errno = EINVAL; |
| 261 | return errmsg("\"%s\" has major number %d, MTD devices have " |
| 262 | "major %d", node, mtd->major, MTD_DEV_MAJOR); |
| 263 | } |
| 264 | |
| 265 | mtd->mtd_num = mtd->minor / 2; |
| 266 | |
| 267 | fd = open(node, O_RDONLY); |
| 268 | if (fd == -1) |
| 269 | return sys_errmsg("cannot open \"%s\"", node); |
| 270 | |
| 271 | if (ioctl(fd, MEMGETINFO, &ui)) { |
| 272 | sys_errmsg("MEMGETINFO ioctl request failed"); |
| 273 | goto out_close; |
| 274 | } |
| 275 | |
| 276 | ret = ioctl(fd, MEMGETBADBLOCK, &offs); |
| 277 | if (ret == -1) { |
| 278 | if (errno != EOPNOTSUPP) { |
| 279 | sys_errmsg("MEMGETBADBLOCK ioctl failed"); |
| 280 | goto out_close; |
| 281 | } |
| 282 | errno = 0; |
| 283 | mtd->bb_allowed = 0; |
| 284 | } else |
| 285 | mtd->bb_allowed = 1; |
| 286 | |
| 287 | mtd->type = ui.type; |
| 288 | mtd->size = ui.size; |
| 289 | mtd->eb_size = ui.erasesize; |
| 290 | mtd->min_io_size = ui.writesize; |
| 291 | mtd->oob_size = ui.oobsize; |
| 292 | |
| 293 | if (mtd->min_io_size <= 0) { |
| 294 | errmsg("mtd%d (%s) has insane min. I/O unit size %d", |
| 295 | mtd->mtd_num, node, mtd->min_io_size); |
| 296 | goto out_close; |
| 297 | } |
| 298 | if (mtd->eb_size <= 0 || mtd->eb_size < mtd->min_io_size) { |
| 299 | errmsg("mtd%d (%s) has insane eraseblock size %d", |
| 300 | mtd->mtd_num, node, mtd->eb_size); |
| 301 | goto out_close; |
| 302 | } |
| 303 | if (mtd->size <= 0 || mtd->size < mtd->eb_size) { |
| 304 | errmsg("mtd%d (%s) has insane size %lld", |
| 305 | mtd->mtd_num, node, mtd->size); |
| 306 | goto out_close; |
| 307 | } |
| 308 | mtd->eb_cnt = mtd->size / mtd->eb_size; |
| 309 | |
| 310 | switch(mtd->type) { |
| 311 | case MTD_ABSENT: |
| 312 | errmsg("mtd%d (%s) is removable and is not present", |
| 313 | mtd->mtd_num, node); |
| 314 | goto out_close; |
| 315 | case MTD_RAM: |
| 316 | strcpy((char *)mtd->type_str, "ram"); |
| 317 | break; |
| 318 | case MTD_ROM: |
| 319 | strcpy((char *)mtd->type_str, "rom"); |
| 320 | break; |
| 321 | case MTD_NORFLASH: |
| 322 | strcpy((char *)mtd->type_str, "nor"); |
| 323 | break; |
| 324 | case MTD_NANDFLASH: |
| 325 | strcpy((char *)mtd->type_str, "nand"); |
| 326 | break; |
| 327 | case MTD_MLCNANDFLASH: |
| 328 | strcpy((char *)mtd->type_str, "mlc-nand"); |
| 329 | break; |
| 330 | case MTD_DATAFLASH: |
| 331 | strcpy((char *)mtd->type_str, "dataflash"); |
| 332 | break; |
| 333 | case MTD_UBIVOLUME: |
| 334 | strcpy((char *)mtd->type_str, "ubi"); |
| 335 | break; |
| 336 | default: |
| 337 | goto out_close; |
| 338 | } |
| 339 | |
| 340 | if (ui.flags & MTD_WRITEABLE) |
| 341 | mtd->writable = 1; |
| 342 | mtd->subpage_size = mtd->min_io_size; |
| 343 | |
| 344 | close(fd); |
| 345 | |
| 346 | /* |
| 347 | * Unfortunately, the device name is not available via ioctl, and |
| 348 | * we have to parse /proc/mtd to get it. |
| 349 | */ |
| 350 | ret = proc_parse_start(&pi); |
| 351 | if (ret) |
| 352 | return -1; |
| 353 | |
| 354 | while (proc_parse_next(&pi)) { |
| 355 | if (pi.mtd_num == mtd->mtd_num) { |
| 356 | strcpy((char *)mtd->name, pi.name); |
| 357 | return 0; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | errmsg("mtd%d not found in \"%s\"", mtd->mtd_num, MTD_PROC_FILE); |
| 362 | errno = ENOENT; |
| 363 | return -1; |
| 364 | |
| 365 | out_close: |
| 366 | close(fd); |
| 367 | return -1; |
| 368 | } |
| 369 | |
| 370 | /** |
| 371 | * legacy_get_dev_info1 - legacy version of 'mtd_get_dev_info1()'. |
| 372 | * @node: name of the MTD device node |
| 373 | * @mtd: the MTD device information is returned here |
| 374 | * |
| 375 | * This function is similar to 'mtd_get_dev_info1()' and has the same |
| 376 | * conventions. |
| 377 | */ |
| 378 | int legacy_get_dev_info1(int mtd_num, struct mtd_dev_info *mtd) |
| 379 | { |
| 380 | char node[sizeof(MTD_DEV_PATT) + 20]; |
| 381 | |
| 382 | sprintf(node, MTD_DEV_PATT, mtd_num); |
| 383 | return legacy_get_dev_info(node, mtd); |
| 384 | } |