git.oblomov.eu Git - linux-2.6/blob - 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         device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), "mtd%d", mtd->index);
  31
  32         device_create(mtd_class, NULL,
  33                       MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), "mtd%dro", mtd->index);
  34 }
  35
  36 static void mtd_notify_remove(struct mtd_info* mtd)
  37 {
  38         if (!mtd)
  39                 return;
  40
  41         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  42         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  43 }
  44
  45 static struct mtd_notifier notifier = {
  46         .add    = mtd_notify_add,
  47         .remove = mtd_notify_remove,
  48 };
  49
  50 /*
  51  * Data structure to hold the pointer to the mtd device as well
  52  * as mode information ofr various use cases.
  53  */
  54 struct mtd_file_info {
  55         struct mtd_info *mtd;
  56         enum mtd_file_modes mode;
  57 };
  58
  59 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  60 {
  61         struct mtd_file_info *mfi = file->private_data;
  62         struct mtd_info *mtd = mfi->mtd;
  63
  64         switch (orig) {
  65         case SEEK_SET:
  66                 break;
  67         case SEEK_CUR:
  68                 offset += file->f_pos;
  69                 break;
  70         case SEEK_END:
  71                 offset += mtd->size;
  72                 break;
  73         default:
  74                 return -EINVAL;
  75         }
  76
  77         if (offset >= 0 && offset <= mtd->size)
  78                 return file->f_pos = offset;
  79
  80         return -EINVAL;
  81 }
  82
  83
  84
  85 static int mtd_open(struct inode *inode, struct file *file)
  86 {
  87         int minor = iminor(inode);
  88         int devnum = minor >> 1;
  89         struct mtd_info *mtd;
  90         struct mtd_file_info *mfi;
  91
  92         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  93
  94         if (devnum >= MAX_MTD_DEVICES)
  95                 return -ENODEV;
  96
  97         /* You can't open the RO devices RW */
  98         if ((file->f_mode & 2) && (minor & 1))
  99                 return -EACCES;
 100
 101         mtd = get_mtd_device(NULL, devnum);
 102
 103         if (IS_ERR(mtd))
 104                 return PTR_ERR(mtd);
 105
 106         if (MTD_ABSENT == mtd->type) {
 107                 put_mtd_device(mtd);
 108                 return -ENODEV;
 109         }
 110
 111         /* You can't open it RW if it's not a writeable device */
 112         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 113                 put_mtd_device(mtd);
 114                 return -EACCES;
 115         }
 116
 117         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 118         if (!mfi) {
 119                 put_mtd_device(mtd);
 120                 return -ENOMEM;
 121         }
 122         mfi->mtd = mtd;
 123         file->private_data = mfi;
 124
 125         return 0;
 126 } /* mtd_open */
 127
 128 /*====================================================================*/
 129
 130 static int mtd_close(struct inode *inode, struct file *file)
 131 {
 132         struct mtd_file_info *mfi = file->private_data;
 133         struct mtd_info *mtd = mfi->mtd;
 134
 135         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 136
 137         /* Only sync if opened RW */
 138         if ((file->f_mode & 2) && mtd->sync)
 139                 mtd->sync(mtd);
 140
 141         put_mtd_device(mtd);
 142         file->private_data = NULL;
 143         kfree(mfi);
 144
 145         return 0;
 146 } /* mtd_close */
 147
 148 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 149    userspace buffer down and use it directly with readv/writev.
 150 */
 151 #define MAX_KMALLOC_SIZE 0x20000
 152
 153 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 154 {
 155         struct mtd_file_info *mfi = file->private_data;
 156         struct mtd_info *mtd = mfi->mtd;
 157         size_t retlen=0;
 158         size_t total_retlen=0;
 159         int ret=0;
 160         int len;
 161         char *kbuf;
 162
 163         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 164
 165         if (*ppos + count > mtd->size)
 166                 count = mtd->size - *ppos;
 167
 168         if (!count)
 169                 return 0;
 170
 171         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 172            and pass them directly to the MTD functions */
 173
 174         if (count > MAX_KMALLOC_SIZE)
 175                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 176         else
 177                 kbuf=kmalloc(count, GFP_KERNEL);
 178
 179         if (!kbuf)
 180                 return -ENOMEM;
 181
 182         while (count) {
 183
 184                 if (count > MAX_KMALLOC_SIZE)
 185                         len = MAX_KMALLOC_SIZE;
 186                 else
 187                         len = count;
 188
 189                 switch (mfi->mode) {
 190                 case MTD_MODE_OTP_FACTORY:
 191                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 192                         break;
 193                 case MTD_MODE_OTP_USER:
 194                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 195                         break;
 196                 case MTD_MODE_RAW:
 197                 {
 198                         struct mtd_oob_ops ops;
 199
 200                         ops.mode = MTD_OOB_RAW;
 201                         ops.datbuf = kbuf;
 202                         ops.oobbuf = NULL;
 203                         ops.len = len;
 204
 205                         ret = mtd->read_oob(mtd, *ppos, &ops);
 206                         retlen = ops.retlen;
 207                         break;
 208                 }
 209                 default:
 210                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 211                 }
 212                 /* Nand returns -EBADMSG on ecc errors, but it returns
 213                  * the data. For our userspace tools it is important
 214                  * to dump areas with ecc errors !
 215                  * For kernel internal usage it also might return -EUCLEAN
 216                  * to signal the caller that a bitflip has occured and has
 217                  * been corrected by the ECC algorithm.
 218                  * Userspace software which accesses NAND this way
 219                  * must be aware of the fact that it deals with NAND
 220                  */
 221                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 222                         *ppos += retlen;
 223                         if (copy_to_user(buf, kbuf, retlen)) {
 224                                 kfree(kbuf);
 225                                 return -EFAULT;
 226                         }
 227                         else
 228                                 total_retlen += retlen;
 229
 230                         count -= retlen;
 231                         buf += retlen;
 232                         if (retlen == 0)
 233                                 count = 0;
 234                 }
 235                 else {
 236                         kfree(kbuf);
 237                         return ret;
 238                 }
 239
 240         }
 241
 242         kfree(kbuf);
 243         return total_retlen;
 244 } /* mtd_read */
 245
 246 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 247 {
 248         struct mtd_file_info *mfi = file->private_data;
 249         struct mtd_info *mtd = mfi->mtd;
 250         char *kbuf;
 251         size_t retlen;
 252         size_t total_retlen=0;
 253         int ret=0;
 254         int len;
 255
 256         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 257
 258         if (*ppos == mtd->size)
 259                 return -ENOSPC;
 260
 261         if (*ppos + count > mtd->size)
 262                 count = mtd->size - *ppos;
 263
 264         if (!count)
 265                 return 0;
 266
 267         if (count > MAX_KMALLOC_SIZE)
 268                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 269         else
 270                 kbuf=kmalloc(count, GFP_KERNEL);
 271
 272         if (!kbuf)
 273                 return -ENOMEM;
 274
 275         while (count) {
 276
 277                 if (count > MAX_KMALLOC_SIZE)
 278                         len = MAX_KMALLOC_SIZE;
 279                 else
 280                         len = count;
 281
 282                 if (copy_from_user(kbuf, buf, len)) {
 283                         kfree(kbuf);
 284                         return -EFAULT;
 285                 }
 286
 287                 switch (mfi->mode) {
 288                 case MTD_MODE_OTP_FACTORY:
 289                         ret = -EROFS;
 290                         break;
 291                 case MTD_MODE_OTP_USER:
 292                         if (!mtd->write_user_prot_reg) {
 293                                 ret = -EOPNOTSUPP;
 294                                 break;
 295                         }
 296                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 297                         break;
 298
 299                 case MTD_MODE_RAW:
 300                 {
 301                         struct mtd_oob_ops ops;
 302
 303                         ops.mode = MTD_OOB_RAW;
 304                         ops.datbuf = kbuf;
 305                         ops.oobbuf = NULL;
 306                         ops.len = len;
 307
 308                         ret = mtd->write_oob(mtd, *ppos, &ops);
 309                         retlen = ops.retlen;
 310                         break;
 311                 }
 312
 313                 default:
 314                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 315                 }
 316                 if (!ret) {
 317                         *ppos += retlen;
 318                         total_retlen += retlen;
 319                         count -= retlen;
 320                         buf += retlen;
 321                 }
 322                 else {
 323                         kfree(kbuf);
 324                         return ret;
 325                 }
 326         }
 327
 328         kfree(kbuf);
 329         return total_retlen;
 330 } /* mtd_write */
 331
 332 /*======================================================================
 333
 334     IOCTL calls for getting device parameters.
 335
 336 ======================================================================*/
 337 static void mtdchar_erase_callback (struct erase_info *instr)
 338 {
 339         wake_up((wait_queue_head_t *)instr->priv);
 340 }
 341
 342 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 343 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 344 {
 345         struct mtd_info *mtd = mfi->mtd;
 346         int ret = 0;
 347
 348         switch (mode) {
 349         case MTD_OTP_FACTORY:
 350                 if (!mtd->read_fact_prot_reg)
 351                         ret = -EOPNOTSUPP;
 352                 else
 353                         mfi->mode = MTD_MODE_OTP_FACTORY;
 354                 break;
 355         case MTD_OTP_USER:
 356                 if (!mtd->read_fact_prot_reg)
 357                         ret = -EOPNOTSUPP;
 358                 else
 359                         mfi->mode = MTD_MODE_OTP_USER;
 360                 break;
 361         default:
 362                 ret = -EINVAL;
 363         case MTD_OTP_OFF:
 364                 break;
 365         }
 366         return ret;
 367 }
 368 #else
 369 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 370 #endif
 371
 372 static int mtd_ioctl(struct inode *inode, struct file *file,
 373                      u_int cmd, u_long arg)
 374 {
 375         struct mtd_file_info *mfi = file->private_data;
 376         struct mtd_info *mtd = mfi->mtd;
 377         void __user *argp = (void __user *)arg;
 378         int ret = 0;
 379         u_long size;
 380         struct mtd_info_user info;
 381
 382         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 383
 384         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 385         if (cmd & IOC_IN) {
 386                 if (!access_ok(VERIFY_READ, argp, size))
 387                         return -EFAULT;
 388         }
 389         if (cmd & IOC_OUT) {
 390                 if (!access_ok(VERIFY_WRITE, argp, size))
 391                         return -EFAULT;
 392         }
 393
 394         switch (cmd) {
 395         case MEMGETREGIONCOUNT:
 396                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 397                         return -EFAULT;
 398                 break;
 399
 400         case MEMGETREGIONINFO:
 401         {
 402                 struct region_info_user ur;
 403
 404                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 405                         return -EFAULT;
 406
 407                 if (ur.regionindex >= mtd->numeraseregions)
 408                         return -EINVAL;
 409                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 410                                 sizeof(struct mtd_erase_region_info)))
 411                         return -EFAULT;
 412                 break;
 413         }
 414
 415         case MEMGETINFO:
 416                 info.type       = mtd->type;
 417                 info.flags      = mtd->flags;
 418                 info.size       = mtd->size;
 419                 info.erasesize  = mtd->erasesize;
 420                 info.writesize  = mtd->writesize;
 421                 info.oobsize    = mtd->oobsize;
 422                 /* The below fields are obsolete */
 423                 info.ecctype    = -1;
 424                 info.eccsize    = 0;
 425                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 426                         return -EFAULT;
 427                 break;
 428
 429         case MEMERASE:
 430         {
 431                 struct erase_info *erase;
 432
 433                 if(!(file->f_mode & 2))
 434                         return -EPERM;
 435
 436                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 437                 if (!erase)
 438                         ret = -ENOMEM;
 439                 else {
 440                         wait_queue_head_t waitq;
 441                         DECLARE_WAITQUEUE(wait, current);
 442
 443                         init_waitqueue_head(&waitq);
 444
 445                         if (copy_from_user(&erase->addr, argp,
 446                                     sizeof(struct erase_info_user))) {
 447                                 kfree(erase);
 448                                 return -EFAULT;
 449                         }
 450                         erase->mtd = mtd;
 451                         erase->callback = mtdchar_erase_callback;
 452                         erase->priv = (unsigned long)&waitq;
 453
 454                         /*
 455                           FIXME: Allow INTERRUPTIBLE. Which means
 456                           not having the wait_queue head on the stack.
 457
 458                           If the wq_head is on the stack, and we
 459                           leave because we got interrupted, then the
 460                           wq_head is no longer there when the
 461                           callback routine tries to wake us up.
 462                         */
 463                         ret = mtd->erase(mtd, erase);
 464                         if (!ret) {
 465                                 set_current_state(TASK_UNINTERRUPTIBLE);
 466                                 add_wait_queue(&waitq, &wait);
 467                                 if (erase->state != MTD_ERASE_DONE &&
 468                                     erase->state != MTD_ERASE_FAILED)
 469                                         schedule();
 470                                 remove_wait_queue(&waitq, &wait);
 471                                 set_current_state(TASK_RUNNING);
 472
 473                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 474                         }
 475                         kfree(erase);
 476                 }
 477                 break;
 478         }
 479
 480         case MEMWRITEOOB:
 481         {
 482                 struct mtd_oob_buf buf;
 483                 struct mtd_oob_ops ops;
 484                 uint32_t retlen;
 485
 486                 if(!(file->f_mode & 2))
 487                         return -EPERM;
 488
 489                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 490                         return -EFAULT;
 491
 492                 if (buf.length > 4096)
 493                         return -EINVAL;
 494
 495                 if (!mtd->write_oob)
 496                         ret = -EOPNOTSUPP;
 497                 else
 498                         ret = access_ok(VERIFY_READ, buf.ptr,
 499                                         buf.length) ? 0 : EFAULT;
 500
 501                 if (ret)
 502                         return ret;
 503
 504                 ops.ooblen = buf.length;
 505                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 506                 ops.datbuf = NULL;
 507                 ops.mode = MTD_OOB_PLACE;
 508
 509                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 510                         return -EINVAL;
 511
 512                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 513                 if (!ops.oobbuf)
 514                         return -ENOMEM;
 515
 516                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 517                         kfree(ops.oobbuf);
 518                         return -EFAULT;
 519                 }
 520
 521                 buf.start &= ~(mtd->oobsize - 1);
 522                 ret = mtd->write_oob(mtd, buf.start, &ops);
 523
 524                 if (ops.oobretlen > 0xFFFFFFFFU)
 525                         ret = -EOVERFLOW;
 526                 retlen = ops.oobretlen;
 527                 if (copy_to_user(&((struct mtd_oob_buf *)argp)->length,
 528                                  &retlen, sizeof(buf.length)))
 529                         ret = -EFAULT;
 530
 531                 kfree(ops.oobbuf);
 532                 break;
 533
 534         }
 535
 536         case MEMREADOOB:
 537         {
 538                 struct mtd_oob_buf buf;
 539                 struct mtd_oob_ops ops;
 540
 541                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 542                         return -EFAULT;
 543
 544                 if (buf.length > 4096)
 545                         return -EINVAL;
 546
 547                 if (!mtd->read_oob)
 548                         ret = -EOPNOTSUPP;
 549                 else
 550                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 551                                         buf.length) ? 0 : -EFAULT;
 552                 if (ret)
 553                         return ret;
 554
 555                 ops.ooblen = buf.length;
 556                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 557                 ops.datbuf = NULL;
 558                 ops.mode = MTD_OOB_PLACE;
 559
 560                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 561                         return -EINVAL;
 562
 563                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 564                 if (!ops.oobbuf)
 565                         return -ENOMEM;
 566
 567                 buf.start &= ~(mtd->oobsize - 1);
 568                 ret = mtd->read_oob(mtd, buf.start, &ops);
 569
 570                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 571                         ret = -EFAULT;
 572                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 573                                                     ops.oobretlen))
 574                         ret = -EFAULT;
 575
 576                 kfree(ops.oobbuf);
 577                 break;
 578         }
 579
 580         case MEMLOCK:
 581         {
 582                 struct erase_info_user info;
 583
 584                 if (copy_from_user(&info, argp, sizeof(info)))
 585                         return -EFAULT;
 586
 587                 if (!mtd->lock)
 588                         ret = -EOPNOTSUPP;
 589                 else
 590                         ret = mtd->lock(mtd, info.start, info.length);
 591                 break;
 592         }
 593
 594         case MEMUNLOCK:
 595         {
 596                 struct erase_info_user info;
 597
 598                 if (copy_from_user(&info, argp, sizeof(info)))
 599                         return -EFAULT;
 600
 601                 if (!mtd->unlock)
 602                         ret = -EOPNOTSUPP;
 603                 else
 604                         ret = mtd->unlock(mtd, info.start, info.length);
 605                 break;
 606         }
 607
 608         /* Legacy interface */
 609         case MEMGETOOBSEL:
 610         {
 611                 struct nand_oobinfo oi;
 612
 613                 if (!mtd->ecclayout)
 614                         return -EOPNOTSUPP;
 615                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 616                         return -EINVAL;
 617
 618                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 619                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 620                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 621                        sizeof(oi.oobfree));
 622                 oi.eccbytes = mtd->ecclayout->eccbytes;
 623
 624                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 625                         return -EFAULT;
 626                 break;
 627         }
 628
 629         case MEMGETBADBLOCK:
 630         {
 631                 loff_t offs;
 632
 633                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 634                         return -EFAULT;
 635                 if (!mtd->block_isbad)
 636                         ret = -EOPNOTSUPP;
 637                 else
 638                         return mtd->block_isbad(mtd, offs);
 639                 break;
 640         }
 641
 642         case MEMSETBADBLOCK:
 643         {
 644                 loff_t offs;
 645
 646                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 647                         return -EFAULT;
 648                 if (!mtd->block_markbad)
 649                         ret = -EOPNOTSUPP;
 650                 else
 651                         return mtd->block_markbad(mtd, offs);
 652                 break;
 653         }
 654
 655 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 656         case OTPSELECT:
 657         {
 658                 int mode;
 659                 if (copy_from_user(&mode, argp, sizeof(int)))
 660                         return -EFAULT;
 661
 662                 mfi->mode = MTD_MODE_NORMAL;
 663
 664                 ret = otp_select_filemode(mfi, mode);
 665
 666                 file->f_pos = 0;
 667                 break;
 668         }
 669
 670         case OTPGETREGIONCOUNT:
 671         case OTPGETREGIONINFO:
 672         {
 673                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 674                 if (!buf)
 675                         return -ENOMEM;
 676                 ret = -EOPNOTSUPP;
 677                 switch (mfi->mode) {
 678                 case MTD_MODE_OTP_FACTORY:
 679                         if (mtd->get_fact_prot_info)
 680                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 681                         break;
 682                 case MTD_MODE_OTP_USER:
 683                         if (mtd->get_user_prot_info)
 684                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 685                         break;
 686                 default:
 687                         break;
 688                 }
 689                 if (ret >= 0) {
 690                         if (cmd == OTPGETREGIONCOUNT) {
 691                                 int nbr = ret / sizeof(struct otp_info);
 692                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 693                         } else
 694                                 ret = copy_to_user(argp, buf, ret);
 695                         if (ret)
 696                                 ret = -EFAULT;
 697                 }
 698                 kfree(buf);
 699                 break;
 700         }
 701
 702         case OTPLOCK:
 703         {
 704                 struct otp_info info;
 705
 706                 if (mfi->mode != MTD_MODE_OTP_USER)
 707                         return -EINVAL;
 708                 if (copy_from_user(&info, argp, sizeof(info)))
 709                         return -EFAULT;
 710                 if (!mtd->lock_user_prot_reg)
 711                         return -EOPNOTSUPP;
 712                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 713                 break;
 714         }
 715 #endif
 716
 717         case ECCGETLAYOUT:
 718         {
 719                 if (!mtd->ecclayout)
 720                         return -EOPNOTSUPP;
 721
 722                 if (copy_to_user(argp, mtd->ecclayout,
 723                                  sizeof(struct nand_ecclayout)))
 724                         return -EFAULT;
 725                 break;
 726         }
 727
 728         case ECCGETSTATS:
 729         {
 730                 if (copy_to_user(argp, &mtd->ecc_stats,
 731                                  sizeof(struct mtd_ecc_stats)))
 732                         return -EFAULT;
 733                 break;
 734         }
 735
 736         case MTDFILEMODE:
 737         {
 738                 mfi->mode = 0;
 739
 740                 switch(arg) {
 741                 case MTD_MODE_OTP_FACTORY:
 742                 case MTD_MODE_OTP_USER:
 743                         ret = otp_select_filemode(mfi, arg);
 744                         break;
 745
 746                 case MTD_MODE_RAW:
 747                         if (!mtd->read_oob || !mtd->write_oob)
 748                                 return -EOPNOTSUPP;
 749                         mfi->mode = arg;
 750
 751                 case MTD_MODE_NORMAL:
 752                         break;
 753                 default:
 754                         ret = -EINVAL;
 755                 }
 756                 file->f_pos = 0;
 757                 break;
 758         }
 759
 760         default:
 761                 ret = -ENOTTY;
 762         }
 763
 764         return ret;
 765 } /* memory_ioctl */
 766
 767 static const struct file_operations mtd_fops = {
 768         .owner          = THIS_MODULE,
 769         .llseek         = mtd_lseek,
 770         .read           = mtd_read,
 771         .write          = mtd_write,
 772         .ioctl          = mtd_ioctl,
 773         .open           = mtd_open,
 774         .release        = mtd_close,
 775 };
 776
 777 static int __init init_mtdchar(void)
 778 {
 779         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 780                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 781                        MTD_CHAR_MAJOR);
 782                 return -EAGAIN;
 783         }
 784
 785         mtd_class = class_create(THIS_MODULE, "mtd");
 786
 787         if (IS_ERR(mtd_class)) {
 788                 printk(KERN_ERR "Error creating mtd class.\n");
 789                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 790                 return PTR_ERR(mtd_class);
 791         }
 792
 793         register_mtd_user(&notifier);
 794         return 0;
 795 }
 796
 797 static void __exit cleanup_mtdchar(void)
 798 {
 799         unregister_mtd_user(&notifier);
 800         class_destroy(mtd_class);
 801         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 802 }
 803
 804 module_init(init_mtdchar);
 805 module_exit(cleanup_mtdchar);
 806
 807
 808 MODULE_LICENSE("GPL");
 809 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 810 MODULE_DESCRIPTION("Direct character-device access to MTD devices");