drivers/mtd/mtdchar.c

   1 /*
   2  * Character-device access to raw MTD devices.
   3  *
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/fs.h>
   8 #include <linux/mm.h>
   9 #include <linux/err.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/sched.h>
  15
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/compatmac.h>
  18
  19 #include <asm/uaccess.h>
  20
  21 static struct class *mtd_class;
  22
  23 static void mtd_notify_add(struct mtd_info* mtd)
  24 {
  25         if (!mtd)
  26                 return;
  27
  28         device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), "mtd%d", mtd->index);
  29
  30         device_create(mtd_class, NULL,
  31                       MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), "mtd%dro", mtd->index);
  32 }
  33
  34 static void mtd_notify_remove(struct mtd_info* mtd)
  35 {
  36         if (!mtd)
  37                 return;
  38
  39         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  40         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  41 }
  42
  43 static struct mtd_notifier notifier = {
  44         .add    = mtd_notify_add,
  45         .remove = mtd_notify_remove,
  46 };
  47
  48 /*
  49  * Data structure to hold the pointer to the mtd device as well
  50  * as mode information ofr various use cases.
  51  */
  52 struct mtd_file_info {
  53         struct mtd_info *mtd;
  54         enum mtd_file_modes mode;
  55 };
  56
  57 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  58 {
  59         struct mtd_file_info *mfi = file->private_data;
  60         struct mtd_info *mtd = mfi->mtd;
  61
  62         switch (orig) {
  63         case SEEK_SET:
  64                 break;
  65         case SEEK_CUR:
  66                 offset += file->f_pos;
  67                 break;
  68         case SEEK_END:
  69                 offset += mtd->size;
  70                 break;
  71         default:
  72                 return -EINVAL;
  73         }
  74
  75         if (offset >= 0 && offset <= mtd->size)
  76                 return file->f_pos = offset;
  77
  78         return -EINVAL;
  79 }
  80
  81
  82
  83 static int mtd_open(struct inode *inode, struct file *file)
  84 {
  85         int minor = iminor(inode);
  86         int devnum = minor >> 1;
  87         struct mtd_info *mtd;
  88         struct mtd_file_info *mfi;
  89
  90         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  91
  92         if (devnum >= MAX_MTD_DEVICES)
  93                 return -ENODEV;
  94
  95         /* You can't open the RO devices RW */
  96         if ((file->f_mode & 2) && (minor & 1))
  97                 return -EACCES;
  98
  99         mtd = get_mtd_device(NULL, devnum);
 100
 101         if (IS_ERR(mtd))
 102                 return PTR_ERR(mtd);
 103
 104         if (MTD_ABSENT == mtd->type) {
 105                 put_mtd_device(mtd);
 106                 return -ENODEV;
 107         }
 108
 109         /* You can't open it RW if it's not a writeable device */
 110         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 111                 put_mtd_device(mtd);
 112                 return -EACCES;
 113         }
 114
 115         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 116         if (!mfi) {
 117                 put_mtd_device(mtd);
 118                 return -ENOMEM;
 119         }
 120         mfi->mtd = mtd;
 121         file->private_data = mfi;
 122
 123         return 0;
 124 } /* mtd_open */
 125
 126 /*====================================================================*/
 127
 128 static int mtd_close(struct inode *inode, struct file *file)
 129 {
 130         struct mtd_file_info *mfi = file->private_data;
 131         struct mtd_info *mtd = mfi->mtd;
 132
 133         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 134
 135         /* Only sync if opened RW */
 136         if ((file->f_mode & 2) && mtd->sync)
 137                 mtd->sync(mtd);
 138
 139         put_mtd_device(mtd);
 140         file->private_data = NULL;
 141         kfree(mfi);
 142
 143         return 0;
 144 } /* mtd_close */
 145
 146 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 147    userspace buffer down and use it directly with readv/writev.
 148 */
 149 #define MAX_KMALLOC_SIZE 0x20000
 150
 151 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 152 {
 153         struct mtd_file_info *mfi = file->private_data;
 154         struct mtd_info *mtd = mfi->mtd;
 155         size_t retlen=0;
 156         size_t total_retlen=0;
 157         int ret=0;
 158         int len;
 159         char *kbuf;
 160
 161         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 162
 163         if (*ppos + count > mtd->size)
 164                 count = mtd->size - *ppos;
 165
 166         if (!count)
 167                 return 0;
 168
 169         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 170            and pass them directly to the MTD functions */
 171
 172         if (count > MAX_KMALLOC_SIZE)
 173                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 174         else
 175                 kbuf=kmalloc(count, GFP_KERNEL);
 176
 177         if (!kbuf)
 178                 return -ENOMEM;
 179
 180         while (count) {
 181
 182                 if (count > MAX_KMALLOC_SIZE)
 183                         len = MAX_KMALLOC_SIZE;
 184                 else
 185                         len = count;
 186
 187                 switch (mfi->mode) {
 188                 case MTD_MODE_OTP_FACTORY:
 189                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 190                         break;
 191                 case MTD_MODE_OTP_USER:
 192                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 193                         break;
 194                 case MTD_MODE_RAW:
 195                 {
 196                         struct mtd_oob_ops ops;
 197
 198                         ops.mode = MTD_OOB_RAW;
 199                         ops.datbuf = kbuf;
 200                         ops.oobbuf = NULL;
 201                         ops.len = len;
 202
 203                         ret = mtd->read_oob(mtd, *ppos, &ops);
 204                         retlen = ops.retlen;
 205                         break;
 206                 }
 207                 default:
 208                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 209                 }
 210                 /* Nand returns -EBADMSG on ecc errors, but it returns
 211                  * the data. For our userspace tools it is important
 212                  * to dump areas with ecc errors !
 213                  * For kernel internal usage it also might return -EUCLEAN
 214                  * to signal the caller that a bitflip has occured and has
 215                  * been corrected by the ECC algorithm.
 216                  * Userspace software which accesses NAND this way
 217                  * must be aware of the fact that it deals with NAND
 218                  */
 219                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 220                         *ppos += retlen;
 221                         if (copy_to_user(buf, kbuf, retlen)) {
 222                                 kfree(kbuf);
 223                                 return -EFAULT;
 224                         }
 225                         else
 226                                 total_retlen += retlen;
 227
 228                         count -= retlen;
 229                         buf += retlen;
 230                         if (retlen == 0)
 231                                 count = 0;
 232                 }
 233                 else {
 234                         kfree(kbuf);
 235                         return ret;
 236                 }
 237
 238         }
 239
 240         kfree(kbuf);
 241         return total_retlen;
 242 } /* mtd_read */
 243
 244 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 245 {
 246         struct mtd_file_info *mfi = file->private_data;
 247         struct mtd_info *mtd = mfi->mtd;
 248         char *kbuf;
 249         size_t retlen;
 250         size_t total_retlen=0;
 251         int ret=0;
 252         int len;
 253
 254         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 255
 256         if (*ppos == mtd->size)
 257                 return -ENOSPC;
 258
 259         if (*ppos + count > mtd->size)
 260                 count = mtd->size - *ppos;
 261
 262         if (!count)
 263                 return 0;
 264
 265         if (count > MAX_KMALLOC_SIZE)
 266                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 267         else
 268                 kbuf=kmalloc(count, GFP_KERNEL);
 269
 270         if (!kbuf)
 271                 return -ENOMEM;
 272
 273         while (count) {
 274
 275                 if (count > MAX_KMALLOC_SIZE)
 276                         len = MAX_KMALLOC_SIZE;
 277                 else
 278                         len = count;
 279
 280                 if (copy_from_user(kbuf, buf, len)) {
 281                         kfree(kbuf);
 282                         return -EFAULT;
 283                 }
 284
 285                 switch (mfi->mode) {
 286                 case MTD_MODE_OTP_FACTORY:
 287                         ret = -EROFS;
 288                         break;
 289                 case MTD_MODE_OTP_USER:
 290                         if (!mtd->write_user_prot_reg) {
 291                                 ret = -EOPNOTSUPP;
 292                                 break;
 293                         }
 294                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 295                         break;
 296
 297                 case MTD_MODE_RAW:
 298                 {
 299                         struct mtd_oob_ops ops;
 300
 301                         ops.mode = MTD_OOB_RAW;
 302                         ops.datbuf = kbuf;
 303                         ops.oobbuf = NULL;
 304                         ops.len = len;
 305
 306                         ret = mtd->write_oob(mtd, *ppos, &ops);
 307                         retlen = ops.retlen;
 308                         break;
 309                 }
 310
 311                 default:
 312                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 313                 }
 314                 if (!ret) {
 315                         *ppos += retlen;
 316                         total_retlen += retlen;
 317                         count -= retlen;
 318                         buf += retlen;
 319                 }
 320                 else {
 321                         kfree(kbuf);
 322                         return ret;
 323                 }
 324         }
 325
 326         kfree(kbuf);
 327         return total_retlen;
 328 } /* mtd_write */
 329
 330 /*======================================================================
 331
 332     IOCTL calls for getting device parameters.
 333
 334 ======================================================================*/
 335 static void mtdchar_erase_callback (struct erase_info *instr)
 336 {
 337         wake_up((wait_queue_head_t *)instr->priv);
 338 }
 339
 340 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 341 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 342 {
 343         struct mtd_info *mtd = mfi->mtd;
 344         int ret = 0;
 345
 346         switch (mode) {
 347         case MTD_OTP_FACTORY:
 348                 if (!mtd->read_fact_prot_reg)
 349                         ret = -EOPNOTSUPP;
 350                 else
 351                         mfi->mode = MTD_MODE_OTP_FACTORY;
 352                 break;
 353         case MTD_OTP_USER:
 354                 if (!mtd->read_fact_prot_reg)
 355                         ret = -EOPNOTSUPP;
 356                 else
 357                         mfi->mode = MTD_MODE_OTP_USER;
 358                 break;
 359         default:
 360                 ret = -EINVAL;
 361         case MTD_OTP_OFF:
 362                 break;
 363         }
 364         return ret;
 365 }
 366 #else
 367 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 368 #endif
 369
 370 static int mtd_ioctl(struct inode *inode, struct file *file,
 371                      u_int cmd, u_long arg)
 372 {
 373         struct mtd_file_info *mfi = file->private_data;
 374         struct mtd_info *mtd = mfi->mtd;
 375         void __user *argp = (void __user *)arg;
 376         int ret = 0;
 377         u_long size;
 378         struct mtd_info_user info;
 379
 380         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 381
 382         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 383         if (cmd & IOC_IN) {
 384                 if (!access_ok(VERIFY_READ, argp, size))
 385                         return -EFAULT;
 386         }
 387         if (cmd & IOC_OUT) {
 388                 if (!access_ok(VERIFY_WRITE, argp, size))
 389                         return -EFAULT;
 390         }
 391
 392         switch (cmd) {
 393         case MEMGETREGIONCOUNT:
 394                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 395                         return -EFAULT;
 396                 break;
 397
 398         case MEMGETREGIONINFO:
 399         {
 400                 struct region_info_user ur;
 401
 402                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 403                         return -EFAULT;
 404
 405                 if (ur.regionindex >= mtd->numeraseregions)
 406                         return -EINVAL;
 407                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 408                                 sizeof(struct mtd_erase_region_info)))
 409                         return -EFAULT;
 410                 break;
 411         }
 412
 413         case MEMGETINFO:
 414                 info.type       = mtd->type;
 415                 info.flags      = mtd->flags;
 416                 info.size       = mtd->size;
 417                 info.erasesize  = mtd->erasesize;
 418                 info.writesize  = mtd->writesize;
 419                 info.oobsize    = mtd->oobsize;
 420                 /* The below fields are obsolete */
 421                 info.ecctype    = -1;
 422                 info.eccsize    = 0;
 423                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 424                         return -EFAULT;
 425                 break;
 426
 427         case MEMERASE:
 428         {
 429                 struct erase_info *erase;
 430
 431                 if(!(file->f_mode & 2))
 432                         return -EPERM;
 433
 434                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 435                 if (!erase)
 436                         ret = -ENOMEM;
 437                 else {
 438                         wait_queue_head_t waitq;
 439                         DECLARE_WAITQUEUE(wait, current);
 440
 441                         init_waitqueue_head(&waitq);
 442
 443                         if (copy_from_user(&erase->addr, argp,
 444                                     sizeof(struct erase_info_user))) {
 445                                 kfree(erase);
 446                                 return -EFAULT;
 447                         }
 448                         erase->mtd = mtd;
 449                         erase->callback = mtdchar_erase_callback;
 450                         erase->priv = (unsigned long)&waitq;
 451
 452                         /*
 453                           FIXME: Allow INTERRUPTIBLE. Which means
 454                           not having the wait_queue head on the stack.
 455
 456                           If the wq_head is on the stack, and we
 457                           leave because we got interrupted, then the
 458                           wq_head is no longer there when the
 459                           callback routine tries to wake us up.
 460                         */
 461                         ret = mtd->erase(mtd, erase);
 462                         if (!ret) {
 463                                 set_current_state(TASK_UNINTERRUPTIBLE);
 464                                 add_wait_queue(&waitq, &wait);
 465                                 if (erase->state != MTD_ERASE_DONE &&
 466                                     erase->state != MTD_ERASE_FAILED)
 467                                         schedule();
 468                                 remove_wait_queue(&waitq, &wait);
 469                                 set_current_state(TASK_RUNNING);
 470
 471                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 472                         }
 473                         kfree(erase);
 474                 }
 475                 break;
 476         }
 477
 478         case MEMWRITEOOB:
 479         {
 480                 struct mtd_oob_buf buf;
 481                 struct mtd_oob_ops ops;
 482                 struct mtd_oob_buf __user *user_buf = argp;
 483                 uint32_t retlen;
 484
 485                 if(!(file->f_mode & 2))
 486                         return -EPERM;
 487
 488                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 489                         return -EFAULT;
 490
 491                 if (buf.length > 4096)
 492                         return -EINVAL;
 493
 494                 if (!mtd->write_oob)
 495                         ret = -EOPNOTSUPP;
 496                 else
 497                         ret = access_ok(VERIFY_READ, buf.ptr,
 498                                         buf.length) ? 0 : EFAULT;
 499
 500                 if (ret)
 501                         return ret;
 502
 503                 ops.ooblen = buf.length;
 504                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 505                 ops.datbuf = NULL;
 506                 ops.mode = MTD_OOB_PLACE;
 507
 508                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 509                         return -EINVAL;
 510
 511                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 512                 if (!ops.oobbuf)
 513                         return -ENOMEM;
 514
 515                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 516                         kfree(ops.oobbuf);
 517                         return -EFAULT;
 518                 }
 519
 520                 buf.start &= ~(mtd->oobsize - 1);
 521                 ret = mtd->write_oob(mtd, buf.start, &ops);
 522
 523                 if (ops.oobretlen > 0xFFFFFFFFU)
 524                         ret = -EOVERFLOW;
 525                 retlen = ops.oobretlen;
 526                 if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
 527                         ret = -EFAULT;
 528
 529                 kfree(ops.oobbuf);
 530                 break;
 531
 532         }
 533
 534         case MEMREADOOB:
 535         {
 536                 struct mtd_oob_buf buf;
 537                 struct mtd_oob_ops ops;
 538
 539                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 540                         return -EFAULT;
 541
 542                 if (buf.length > 4096)
 543                         return -EINVAL;
 544
 545                 if (!mtd->read_oob)
 546                         ret = -EOPNOTSUPP;
 547                 else
 548                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 549                                         buf.length) ? 0 : -EFAULT;
 550                 if (ret)
 551                         return ret;
 552
 553                 ops.ooblen = buf.length;
 554                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 555                 ops.datbuf = NULL;
 556                 ops.mode = MTD_OOB_PLACE;
 557
 558                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 559                         return -EINVAL;
 560
 561                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 562                 if (!ops.oobbuf)
 563                         return -ENOMEM;
 564
 565                 buf.start &= ~(mtd->oobsize - 1);
 566                 ret = mtd->read_oob(mtd, buf.start, &ops);
 567
 568                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 569                         ret = -EFAULT;
 570                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 571                                                     ops.oobretlen))
 572                         ret = -EFAULT;
 573
 574                 kfree(ops.oobbuf);
 575                 break;
 576         }
 577
 578         case MEMLOCK:
 579         {
 580                 struct erase_info_user info;
 581
 582                 if (copy_from_user(&info, argp, sizeof(info)))
 583                         return -EFAULT;
 584
 585                 if (!mtd->lock)
 586                         ret = -EOPNOTSUPP;
 587                 else
 588                         ret = mtd->lock(mtd, info.start, info.length);
 589                 break;
 590         }
 591
 592         case MEMUNLOCK:
 593         {
 594                 struct erase_info_user info;
 595
 596                 if (copy_from_user(&info, argp, sizeof(info)))
 597                         return -EFAULT;
 598
 599                 if (!mtd->unlock)
 600                         ret = -EOPNOTSUPP;
 601                 else
 602                         ret = mtd->unlock(mtd, info.start, info.length);
 603                 break;
 604         }
 605
 606         /* Legacy interface */
 607         case MEMGETOOBSEL:
 608         {
 609                 struct nand_oobinfo oi;
 610
 611                 if (!mtd->ecclayout)
 612                         return -EOPNOTSUPP;
 613                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 614                         return -EINVAL;
 615
 616                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 617                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 618                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 619                        sizeof(oi.oobfree));
 620                 oi.eccbytes = mtd->ecclayout->eccbytes;
 621
 622                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 623                         return -EFAULT;
 624                 break;
 625         }
 626
 627         case MEMGETBADBLOCK:
 628         {
 629                 loff_t offs;
 630
 631                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 632                         return -EFAULT;
 633                 if (!mtd->block_isbad)
 634                         ret = -EOPNOTSUPP;
 635                 else
 636                         return mtd->block_isbad(mtd, offs);
 637                 break;
 638         }
 639
 640         case MEMSETBADBLOCK:
 641         {
 642                 loff_t offs;
 643
 644                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 645                         return -EFAULT;
 646                 if (!mtd->block_markbad)
 647                         ret = -EOPNOTSUPP;
 648                 else
 649                         return mtd->block_markbad(mtd, offs);
 650                 break;
 651         }
 652
 653 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 654         case OTPSELECT:
 655         {
 656                 int mode;
 657                 if (copy_from_user(&mode, argp, sizeof(int)))
 658                         return -EFAULT;
 659
 660                 mfi->mode = MTD_MODE_NORMAL;
 661
 662                 ret = otp_select_filemode(mfi, mode);
 663
 664                 file->f_pos = 0;
 665                 break;
 666         }
 667
 668         case OTPGETREGIONCOUNT:
 669         case OTPGETREGIONINFO:
 670         {
 671                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 672                 if (!buf)
 673                         return -ENOMEM;
 674                 ret = -EOPNOTSUPP;
 675                 switch (mfi->mode) {
 676                 case MTD_MODE_OTP_FACTORY:
 677                         if (mtd->get_fact_prot_info)
 678                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 679                         break;
 680                 case MTD_MODE_OTP_USER:
 681                         if (mtd->get_user_prot_info)
 682                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 683                         break;
 684                 default:
 685                         break;
 686                 }
 687                 if (ret >= 0) {
 688                         if (cmd == OTPGETREGIONCOUNT) {
 689                                 int nbr = ret / sizeof(struct otp_info);
 690                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 691                         } else
 692                                 ret = copy_to_user(argp, buf, ret);
 693                         if (ret)
 694                                 ret = -EFAULT;
 695                 }
 696                 kfree(buf);
 697                 break;
 698         }
 699
 700         case OTPLOCK:
 701         {
 702                 struct otp_info info;
 703
 704                 if (mfi->mode != MTD_MODE_OTP_USER)
 705                         return -EINVAL;
 706                 if (copy_from_user(&info, argp, sizeof(info)))
 707                         return -EFAULT;
 708                 if (!mtd->lock_user_prot_reg)
 709                         return -EOPNOTSUPP;
 710                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 711                 break;
 712         }
 713 #endif
 714
 715         case ECCGETLAYOUT:
 716         {
 717                 if (!mtd->ecclayout)
 718                         return -EOPNOTSUPP;
 719
 720                 if (copy_to_user(argp, mtd->ecclayout,
 721                                  sizeof(struct nand_ecclayout)))
 722                         return -EFAULT;
 723                 break;
 724         }
 725
 726         case ECCGETSTATS:
 727         {
 728                 if (copy_to_user(argp, &mtd->ecc_stats,
 729                                  sizeof(struct mtd_ecc_stats)))
 730                         return -EFAULT;
 731                 break;
 732         }
 733
 734         case MTDFILEMODE:
 735         {
 736                 mfi->mode = 0;
 737
 738                 switch(arg) {
 739                 case MTD_MODE_OTP_FACTORY:
 740                 case MTD_MODE_OTP_USER:
 741                         ret = otp_select_filemode(mfi, arg);
 742                         break;
 743
 744                 case MTD_MODE_RAW:
 745                         if (!mtd->read_oob || !mtd->write_oob)
 746                                 return -EOPNOTSUPP;
 747                         mfi->mode = arg;
 748
 749                 case MTD_MODE_NORMAL:
 750                         break;
 751                 default:
 752                         ret = -EINVAL;
 753                 }
 754                 file->f_pos = 0;
 755                 break;
 756         }
 757
 758         default:
 759                 ret = -ENOTTY;
 760         }
 761
 762         return ret;
 763 } /* memory_ioctl */
 764
 765 static const struct file_operations mtd_fops = {
 766         .owner          = THIS_MODULE,
 767         .llseek         = mtd_lseek,
 768         .read           = mtd_read,
 769         .write          = mtd_write,
 770         .ioctl          = mtd_ioctl,
 771         .open           = mtd_open,
 772         .release        = mtd_close,
 773 };
 774
 775 static int __init init_mtdchar(void)
 776 {
 777         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 778                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 779                        MTD_CHAR_MAJOR);
 780                 return -EAGAIN;
 781         }
 782
 783         mtd_class = class_create(THIS_MODULE, "mtd");
 784
 785         if (IS_ERR(mtd_class)) {
 786                 printk(KERN_ERR "Error creating mtd class.\n");
 787                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 788                 return PTR_ERR(mtd_class);
 789         }
 790
 791         register_mtd_user(&notifier);
 792         return 0;
 793 }
 794
 795 static void __exit cleanup_mtdchar(void)
 796 {
 797         unregister_mtd_user(&notifier);
 798         class_destroy(mtd_class);
 799         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 800 }
 801
 802 module_init(init_mtdchar);
 803 module_exit(cleanup_mtdchar);
 804
 805
 806 MODULE_LICENSE("GPL");
 807 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 808 MODULE_DESCRIPTION("Direct character-device access to MTD devices");