drivers/mtd/mtdchar.c

   1 /*
   2  * $Id: mtdchar.c,v 1.76 2005/11/07 11:14:20 gleixner Exp $
   3  *
   4  * Character-device access to raw MTD devices.
   5  *
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/fs.h>
  10 #include <linux/mm.h>
  11 #include <linux/err.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched.h>
  17
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/compatmac.h>
  20
  21 #include <asm/uaccess.h>
  22
  23 static struct class *mtd_class;
  24
  25 static void mtd_notify_add(struct mtd_info* mtd)
  26 {
  27         if (!mtd)
  28                 return;
  29
  30         class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  31                             NULL, "mtd%d", mtd->index);
  32
  33         class_device_create(mtd_class, NULL,
  34                             MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
  35                             NULL, "mtd%dro", mtd->index);
  36 }
  37
  38 static void mtd_notify_remove(struct mtd_info* mtd)
  39 {
  40         if (!mtd)
  41                 return;
  42
  43         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  44         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  45 }
  46
  47 static struct mtd_notifier notifier = {
  48         .add    = mtd_notify_add,
  49         .remove = mtd_notify_remove,
  50 };
  51
  52 /*
  53  * Data structure to hold the pointer to the mtd device as well
  54  * as mode information ofr various use cases.
  55  */
  56 struct mtd_file_info {
  57         struct mtd_info *mtd;
  58         enum mtd_file_modes mode;
  59 };
  60
  61 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  62 {
  63         struct mtd_file_info *mfi = file->private_data;
  64         struct mtd_info *mtd = mfi->mtd;
  65
  66         switch (orig) {
  67         case SEEK_SET:
  68                 break;
  69         case SEEK_CUR:
  70                 offset += file->f_pos;
  71                 break;
  72         case SEEK_END:
  73                 offset += mtd->size;
  74                 break;
  75         default:
  76                 return -EINVAL;
  77         }
  78
  79         if (offset >= 0 && offset <= mtd->size)
  80                 return file->f_pos = offset;
  81
  82         return -EINVAL;
  83 }
  84
  85
  86
  87 static int mtd_open(struct inode *inode, struct file *file)
  88 {
  89         int minor = iminor(inode);
  90         int devnum = minor >> 1;
  91         struct mtd_info *mtd;
  92         struct mtd_file_info *mfi;
  93
  94         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  95
  96         if (devnum >= MAX_MTD_DEVICES)
  97                 return -ENODEV;
  98
  99         /* You can't open the RO devices RW */
 100         if ((file->f_mode & 2) && (minor & 1))
 101                 return -EACCES;
 102
 103         mtd = get_mtd_device(NULL, devnum);
 104
 105         if (IS_ERR(mtd))
 106                 return PTR_ERR(mtd);
 107
 108         if (MTD_ABSENT == mtd->type) {
 109                 put_mtd_device(mtd);
 110                 return -ENODEV;
 111         }
 112
 113         /* You can't open it RW if it's not a writeable device */
 114         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 115                 put_mtd_device(mtd);
 116                 return -EACCES;
 117         }
 118
 119         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 120         if (!mfi) {
 121                 put_mtd_device(mtd);
 122                 return -ENOMEM;
 123         }
 124         mfi->mtd = mtd;
 125         file->private_data = mfi;
 126
 127         return 0;
 128 } /* mtd_open */
 129
 130 /*====================================================================*/
 131
 132 static int mtd_close(struct inode *inode, struct file *file)
 133 {
 134         struct mtd_file_info *mfi = file->private_data;
 135         struct mtd_info *mtd = mfi->mtd;
 136
 137         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 138
 139         /* Only sync if opened RW */
 140         if ((file->f_mode & 2) && mtd->sync)
 141                 mtd->sync(mtd);
 142
 143         put_mtd_device(mtd);
 144         file->private_data = NULL;
 145         kfree(mfi);
 146
 147         return 0;
 148 } /* mtd_close */
 149
 150 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 151    userspace buffer down and use it directly with readv/writev.
 152 */
 153 #define MAX_KMALLOC_SIZE 0x20000
 154
 155 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 156 {
 157         struct mtd_file_info *mfi = file->private_data;
 158         struct mtd_info *mtd = mfi->mtd;
 159         size_t retlen=0;
 160         size_t total_retlen=0;
 161         int ret=0;
 162         int len;
 163         char *kbuf;
 164
 165         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 166
 167         if (*ppos + count > mtd->size)
 168                 count = mtd->size - *ppos;
 169
 170         if (!count)
 171                 return 0;
 172
 173         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 174            and pass them directly to the MTD functions */
 175
 176         if (count > MAX_KMALLOC_SIZE)
 177                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 178         else
 179                 kbuf=kmalloc(count, GFP_KERNEL);
 180
 181         if (!kbuf)
 182                 return -ENOMEM;
 183
 184         while (count) {
 185
 186                 if (count > MAX_KMALLOC_SIZE)
 187                         len = MAX_KMALLOC_SIZE;
 188                 else
 189                         len = count;
 190
 191                 switch (mfi->mode) {
 192                 case MTD_MODE_OTP_FACTORY:
 193                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 194                         break;
 195                 case MTD_MODE_OTP_USER:
 196                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 197                         break;
 198                 case MTD_MODE_RAW:
 199                 {
 200                         struct mtd_oob_ops ops;
 201
 202                         ops.mode = MTD_OOB_RAW;
 203                         ops.datbuf = kbuf;
 204                         ops.oobbuf = NULL;
 205                         ops.len = len;
 206
 207                         ret = mtd->read_oob(mtd, *ppos, &ops);
 208                         retlen = ops.retlen;
 209                         break;
 210                 }
 211                 default:
 212                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 213                 }
 214                 /* Nand returns -EBADMSG on ecc errors, but it returns
 215                  * the data. For our userspace tools it is important
 216                  * to dump areas with ecc errors !
 217                  * For kernel internal usage it also might return -EUCLEAN
 218                  * to signal the caller that a bitflip has occured and has
 219                  * been corrected by the ECC algorithm.
 220                  * Userspace software which accesses NAND this way
 221                  * must be aware of the fact that it deals with NAND
 222                  */
 223                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 224                         *ppos += retlen;
 225                         if (copy_to_user(buf, kbuf, retlen)) {
 226                                 kfree(kbuf);
 227                                 return -EFAULT;
 228                         }
 229                         else
 230                                 total_retlen += retlen;
 231
 232                         count -= retlen;
 233                         buf += retlen;
 234                         if (retlen == 0)
 235                                 count = 0;
 236                 }
 237                 else {
 238                         kfree(kbuf);
 239                         return ret;
 240                 }
 241
 242         }
 243
 244         kfree(kbuf);
 245         return total_retlen;
 246 } /* mtd_read */
 247
 248 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 249 {
 250         struct mtd_file_info *mfi = file->private_data;
 251         struct mtd_info *mtd = mfi->mtd;
 252         char *kbuf;
 253         size_t retlen;
 254         size_t total_retlen=0;
 255         int ret=0;
 256         int len;
 257
 258         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 259
 260         if (*ppos == mtd->size)
 261                 return -ENOSPC;
 262
 263         if (*ppos + count > mtd->size)
 264                 count = mtd->size - *ppos;
 265
 266         if (!count)
 267                 return 0;
 268
 269         if (count > MAX_KMALLOC_SIZE)
 270                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 271         else
 272                 kbuf=kmalloc(count, GFP_KERNEL);
 273
 274         if (!kbuf)
 275                 return -ENOMEM;
 276
 277         while (count) {
 278
 279                 if (count > MAX_KMALLOC_SIZE)
 280                         len = MAX_KMALLOC_SIZE;
 281                 else
 282                         len = count;
 283
 284                 if (copy_from_user(kbuf, buf, len)) {
 285                         kfree(kbuf);
 286                         return -EFAULT;
 287                 }
 288
 289                 switch (mfi->mode) {
 290                 case MTD_MODE_OTP_FACTORY:
 291                         ret = -EROFS;
 292                         break;
 293                 case MTD_MODE_OTP_USER:
 294                         if (!mtd->write_user_prot_reg) {
 295                                 ret = -EOPNOTSUPP;
 296                                 break;
 297                         }
 298                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 299                         break;
 300
 301                 case MTD_MODE_RAW:
 302                 {
 303                         struct mtd_oob_ops ops;
 304
 305                         ops.mode = MTD_OOB_RAW;
 306                         ops.datbuf = kbuf;
 307                         ops.oobbuf = NULL;
 308                         ops.len = len;
 309
 310                         ret = mtd->write_oob(mtd, *ppos, &ops);
 311                         retlen = ops.retlen;
 312                         break;
 313                 }
 314
 315                 default:
 316                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 317                 }
 318                 if (!ret) {
 319                         *ppos += retlen;
 320                         total_retlen += retlen;
 321                         count -= retlen;
 322                         buf += retlen;
 323                 }
 324                 else {
 325                         kfree(kbuf);
 326                         return ret;
 327                 }
 328         }
 329
 330         kfree(kbuf);
 331         return total_retlen;
 332 } /* mtd_write */
 333
 334 /*======================================================================
 335
 336     IOCTL calls for getting device parameters.
 337
 338 ======================================================================*/
 339 static void mtdchar_erase_callback (struct erase_info *instr)
 340 {
 341         wake_up((wait_queue_head_t *)instr->priv);
 342 }
 343
 344 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 345 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 346 {
 347         struct mtd_info *mtd = mfi->mtd;
 348         int ret = 0;
 349
 350         switch (mode) {
 351         case MTD_OTP_FACTORY:
 352                 if (!mtd->read_fact_prot_reg)
 353                         ret = -EOPNOTSUPP;
 354                 else
 355                         mfi->mode = MTD_MODE_OTP_FACTORY;
 356                 break;
 357         case MTD_OTP_USER:
 358                 if (!mtd->read_fact_prot_reg)
 359                         ret = -EOPNOTSUPP;
 360                 else
 361                         mfi->mode = MTD_MODE_OTP_USER;
 362                 break;
 363         default:
 364                 ret = -EINVAL;
 365         case MTD_OTP_OFF:
 366                 break;
 367         }
 368         return ret;
 369 }
 370 #else
 371 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 372 #endif
 373
 374 static int mtd_ioctl(struct inode *inode, struct file *file,
 375                      u_int cmd, u_long arg)
 376 {
 377         struct mtd_file_info *mfi = file->private_data;
 378         struct mtd_info *mtd = mfi->mtd;
 379         void __user *argp = (void __user *)arg;
 380         int ret = 0;
 381         u_long size;
 382         struct mtd_info_user info;
 383
 384         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 385
 386         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 387         if (cmd & IOC_IN) {
 388                 if (!access_ok(VERIFY_READ, argp, size))
 389                         return -EFAULT;
 390         }
 391         if (cmd & IOC_OUT) {
 392                 if (!access_ok(VERIFY_WRITE, argp, size))
 393                         return -EFAULT;
 394         }
 395
 396         switch (cmd) {
 397         case MEMGETREGIONCOUNT:
 398                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 399                         return -EFAULT;
 400                 break;
 401
 402         case MEMGETREGIONINFO:
 403         {
 404                 struct region_info_user ur;
 405
 406                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 407                         return -EFAULT;
 408
 409                 if (ur.regionindex >= mtd->numeraseregions)
 410                         return -EINVAL;
 411                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 412                                 sizeof(struct mtd_erase_region_info)))
 413                         return -EFAULT;
 414                 break;
 415         }
 416
 417         case MEMGETINFO:
 418                 info.type       = mtd->type;
 419                 info.flags      = mtd->flags;
 420                 info.size       = mtd->size;
 421                 info.erasesize  = mtd->erasesize;
 422                 info.writesize  = mtd->writesize;
 423                 info.oobsize    = mtd->oobsize;
 424                 /* The below fields are obsolete */
 425                 info.ecctype    = -1;
 426                 info.eccsize    = 0;
 427                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 428                         return -EFAULT;
 429                 break;
 430
 431         case MEMERASE:
 432         {
 433                 struct erase_info *erase;
 434
 435                 if(!(file->f_mode & 2))
 436                         return -EPERM;
 437
 438                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 439                 if (!erase)
 440                         ret = -ENOMEM;
 441                 else {
 442                         wait_queue_head_t waitq;
 443                         DECLARE_WAITQUEUE(wait, current);
 444
 445                         init_waitqueue_head(&waitq);
 446
 447                         if (copy_from_user(&erase->addr, argp,
 448                                     sizeof(struct erase_info_user))) {
 449                                 kfree(erase);
 450                                 return -EFAULT;
 451                         }
 452                         erase->mtd = mtd;
 453                         erase->callback = mtdchar_erase_callback;
 454                         erase->priv = (unsigned long)&waitq;
 455
 456                         /*
 457                           FIXME: Allow INTERRUPTIBLE. Which means
 458                           not having the wait_queue head on the stack.
 459
 460                           If the wq_head is on the stack, and we
 461                           leave because we got interrupted, then the
 462                           wq_head is no longer there when the
 463                           callback routine tries to wake us up.
 464                         */
 465                         ret = mtd->erase(mtd, erase);
 466                         if (!ret) {
 467                                 set_current_state(TASK_UNINTERRUPTIBLE);
 468                                 add_wait_queue(&waitq, &wait);
 469                                 if (erase->state != MTD_ERASE_DONE &&
 470                                     erase->state != MTD_ERASE_FAILED)
 471                                         schedule();
 472                                 remove_wait_queue(&waitq, &wait);
 473                                 set_current_state(TASK_RUNNING);
 474
 475                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 476                         }
 477                         kfree(erase);
 478                 }
 479                 break;
 480         }
 481
 482         case MEMWRITEOOB:
 483         {
 484                 struct mtd_oob_buf buf;
 485                 struct mtd_oob_ops ops;
 486
 487                 if(!(file->f_mode & 2))
 488                         return -EPERM;
 489
 490                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 491                         return -EFAULT;
 492
 493                 if (buf.length > 4096)
 494                         return -EINVAL;
 495
 496                 if (!mtd->write_oob)
 497                         ret = -EOPNOTSUPP;
 498                 else
 499                         ret = access_ok(VERIFY_READ, buf.ptr,
 500                                         buf.length) ? 0 : EFAULT;
 501
 502                 if (ret)
 503                         return ret;
 504
 505                 ops.ooblen = buf.length;
 506                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 507                 ops.datbuf = NULL;
 508                 ops.mode = MTD_OOB_PLACE;
 509
 510                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 511                         return -EINVAL;
 512
 513                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 514                 if (!ops.oobbuf)
 515                         return -ENOMEM;
 516
 517                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 518                         kfree(ops.oobbuf);
 519                         return -EFAULT;
 520                 }
 521
 522                 buf.start &= ~(mtd->oobsize - 1);
 523                 ret = mtd->write_oob(mtd, buf.start, &ops);
 524
 525                 if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen,
 526                                  sizeof(uint32_t)))
 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");