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