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 #include <linux/smp_lock.h>
  18
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/compatmac.h>
  21
  22 #include <asm/uaccess.h>
  23
  24 static struct class *mtd_class;
  25
  26 static void mtd_notify_add(struct mtd_info* mtd)
  27 {
  28         if (!mtd)
  29                 return;
  30
  31         device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), "mtd%d", mtd->index);
  32
  33         device_create(mtd_class, NULL,
  34                       MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), "mtd%dro", mtd->index);
  35 }
  36
  37 static void mtd_notify_remove(struct mtd_info* mtd)
  38 {
  39         if (!mtd)
  40                 return;
  41
  42         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  43         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 SEEK_SET:
  67                 break;
  68         case SEEK_CUR:
  69                 offset += file->f_pos;
  70                 break;
  71         case SEEK_END:
  72                 offset += mtd->size;
  73                 break;
  74         default:
  75                 return -EINVAL;
  76         }
  77
  78         if (offset >= 0 && offset <= mtd->size)
  79                 return file->f_pos = offset;
  80
  81         return -EINVAL;
  82 }
  83
  84
  85
  86 static int mtd_open(struct inode *inode, struct file *file)
  87 {
  88         int minor = iminor(inode);
  89         int devnum = minor >> 1;
  90         int ret = 0;
  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         lock_kernel();
 104         mtd = get_mtd_device(NULL, devnum);
 105
 106         if (IS_ERR(mtd)) {
 107                 ret = PTR_ERR(mtd);
 108                 goto out;
 109         }
 110
 111         if (MTD_ABSENT == mtd->type) {
 112                 put_mtd_device(mtd);
 113                 ret = -ENODEV;
 114                 goto out;
 115         }
 116
 117         /* You can't open it RW if it's not a writeable device */
 118         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 119                 put_mtd_device(mtd);
 120                 ret = -EACCES;
 121                 goto out;
 122         }
 123
 124         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 125         if (!mfi) {
 126                 put_mtd_device(mtd);
 127                 ret = -ENOMEM;
 128                 goto out;
 129         }
 130         mfi->mtd = mtd;
 131         file->private_data = mfi;
 132
 133 out:
 134         unlock_kernel();
 135         return ret;
 136 } /* mtd_open */
 137
 138 /*====================================================================*/
 139
 140 static int mtd_close(struct inode *inode, struct file *file)
 141 {
 142         struct mtd_file_info *mfi = file->private_data;
 143         struct mtd_info *mtd = mfi->mtd;
 144
 145         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 146
 147         /* Only sync if opened RW */
 148         if ((file->f_mode & 2) && mtd->sync)
 149                 mtd->sync(mtd);
 150
 151         put_mtd_device(mtd);
 152         file->private_data = NULL;
 153         kfree(mfi);
 154
 155         return 0;
 156 } /* mtd_close */
 157
 158 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 159    userspace buffer down and use it directly with readv/writev.
 160 */
 161 #define MAX_KMALLOC_SIZE 0x20000
 162
 163 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 164 {
 165         struct mtd_file_info *mfi = file->private_data;
 166         struct mtd_info *mtd = mfi->mtd;
 167         size_t retlen=0;
 168         size_t total_retlen=0;
 169         int ret=0;
 170         int len;
 171         char *kbuf;
 172
 173         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 174
 175         if (*ppos + count > mtd->size)
 176                 count = mtd->size - *ppos;
 177
 178         if (!count)
 179                 return 0;
 180
 181         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 182            and pass them directly to the MTD functions */
 183
 184         if (count > MAX_KMALLOC_SIZE)
 185                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 186         else
 187                 kbuf=kmalloc(count, GFP_KERNEL);
 188
 189         if (!kbuf)
 190                 return -ENOMEM;
 191
 192         while (count) {
 193
 194                 if (count > MAX_KMALLOC_SIZE)
 195                         len = MAX_KMALLOC_SIZE;
 196                 else
 197                         len = count;
 198
 199                 switch (mfi->mode) {
 200                 case MTD_MODE_OTP_FACTORY:
 201                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 202                         break;
 203                 case MTD_MODE_OTP_USER:
 204                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 205                         break;
 206                 case MTD_MODE_RAW:
 207                 {
 208                         struct mtd_oob_ops ops;
 209
 210                         ops.mode = MTD_OOB_RAW;
 211                         ops.datbuf = kbuf;
 212                         ops.oobbuf = NULL;
 213                         ops.len = len;
 214
 215                         ret = mtd->read_oob(mtd, *ppos, &ops);
 216                         retlen = ops.retlen;
 217                         break;
 218                 }
 219                 default:
 220                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 221                 }
 222                 /* Nand returns -EBADMSG on ecc errors, but it returns
 223                  * the data. For our userspace tools it is important
 224                  * to dump areas with ecc errors !
 225                  * For kernel internal usage it also might return -EUCLEAN
 226                  * to signal the caller that a bitflip has occured and has
 227                  * been corrected by the ECC algorithm.
 228                  * Userspace software which accesses NAND this way
 229                  * must be aware of the fact that it deals with NAND
 230                  */
 231                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 232                         *ppos += retlen;
 233                         if (copy_to_user(buf, kbuf, retlen)) {
 234                                 kfree(kbuf);
 235                                 return -EFAULT;
 236                         }
 237                         else
 238                                 total_retlen += retlen;
 239
 240                         count -= retlen;
 241                         buf += retlen;
 242                         if (retlen == 0)
 243                                 count = 0;
 244                 }
 245                 else {
 246                         kfree(kbuf);
 247                         return ret;
 248                 }
 249
 250         }
 251
 252         kfree(kbuf);
 253         return total_retlen;
 254 } /* mtd_read */
 255
 256 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 257 {
 258         struct mtd_file_info *mfi = file->private_data;
 259         struct mtd_info *mtd = mfi->mtd;
 260         char *kbuf;
 261         size_t retlen;
 262         size_t total_retlen=0;
 263         int ret=0;
 264         int len;
 265
 266         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 267
 268         if (*ppos == mtd->size)
 269                 return -ENOSPC;
 270
 271         if (*ppos + count > mtd->size)
 272                 count = mtd->size - *ppos;
 273
 274         if (!count)
 275                 return 0;
 276
 277         if (count > MAX_KMALLOC_SIZE)
 278                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 279         else
 280                 kbuf=kmalloc(count, GFP_KERNEL);
 281
 282         if (!kbuf)
 283                 return -ENOMEM;
 284
 285         while (count) {
 286
 287                 if (count > MAX_KMALLOC_SIZE)
 288                         len = MAX_KMALLOC_SIZE;
 289                 else
 290                         len = count;
 291
 292                 if (copy_from_user(kbuf, buf, len)) {
 293                         kfree(kbuf);
 294                         return -EFAULT;
 295                 }
 296
 297                 switch (mfi->mode) {
 298                 case MTD_MODE_OTP_FACTORY:
 299                         ret = -EROFS;
 300                         break;
 301                 case MTD_MODE_OTP_USER:
 302                         if (!mtd->write_user_prot_reg) {
 303                                 ret = -EOPNOTSUPP;
 304                                 break;
 305                         }
 306                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 307                         break;
 308
 309                 case MTD_MODE_RAW:
 310                 {
 311                         struct mtd_oob_ops ops;
 312
 313                         ops.mode = MTD_OOB_RAW;
 314                         ops.datbuf = kbuf;
 315                         ops.oobbuf = NULL;
 316                         ops.len = len;
 317
 318                         ret = mtd->write_oob(mtd, *ppos, &ops);
 319                         retlen = ops.retlen;
 320                         break;
 321                 }
 322
 323                 default:
 324                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 325                 }
 326                 if (!ret) {
 327                         *ppos += retlen;
 328                         total_retlen += retlen;
 329                         count -= retlen;
 330                         buf += retlen;
 331                 }
 332                 else {
 333                         kfree(kbuf);
 334                         return ret;
 335                 }
 336         }
 337
 338         kfree(kbuf);
 339         return total_retlen;
 340 } /* mtd_write */
 341
 342 /*======================================================================
 343
 344     IOCTL calls for getting device parameters.
 345
 346 ======================================================================*/
 347 static void mtdchar_erase_callback (struct erase_info *instr)
 348 {
 349         wake_up((wait_queue_head_t *)instr->priv);
 350 }
 351
 352 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 353 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 354 {
 355         struct mtd_info *mtd = mfi->mtd;
 356         int ret = 0;
 357
 358         switch (mode) {
 359         case MTD_OTP_FACTORY:
 360                 if (!mtd->read_fact_prot_reg)
 361                         ret = -EOPNOTSUPP;
 362                 else
 363                         mfi->mode = MTD_MODE_OTP_FACTORY;
 364                 break;
 365         case MTD_OTP_USER:
 366                 if (!mtd->read_fact_prot_reg)
 367                         ret = -EOPNOTSUPP;
 368                 else
 369                         mfi->mode = MTD_MODE_OTP_USER;
 370                 break;
 371         default:
 372                 ret = -EINVAL;
 373         case MTD_OTP_OFF:
 374                 break;
 375         }
 376         return ret;
 377 }
 378 #else
 379 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 380 #endif
 381
 382 static int mtd_ioctl(struct inode *inode, struct file *file,
 383                      u_int cmd, u_long arg)
 384 {
 385         struct mtd_file_info *mfi = file->private_data;
 386         struct mtd_info *mtd = mfi->mtd;
 387         void __user *argp = (void __user *)arg;
 388         int ret = 0;
 389         u_long size;
 390         struct mtd_info_user info;
 391
 392         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 393
 394         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 395         if (cmd & IOC_IN) {
 396                 if (!access_ok(VERIFY_READ, argp, size))
 397                         return -EFAULT;
 398         }
 399         if (cmd & IOC_OUT) {
 400                 if (!access_ok(VERIFY_WRITE, argp, size))
 401                         return -EFAULT;
 402         }
 403
 404         switch (cmd) {
 405         case MEMGETREGIONCOUNT:
 406                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 407                         return -EFAULT;
 408                 break;
 409
 410         case MEMGETREGIONINFO:
 411         {
 412                 struct region_info_user ur;
 413
 414                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 415                         return -EFAULT;
 416
 417                 if (ur.regionindex >= mtd->numeraseregions)
 418                         return -EINVAL;
 419                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 420                                 sizeof(struct mtd_erase_region_info)))
 421                         return -EFAULT;
 422                 break;
 423         }
 424
 425         case MEMGETINFO:
 426                 info.type       = mtd->type;
 427                 info.flags      = mtd->flags;
 428                 info.size       = mtd->size;
 429                 info.erasesize  = mtd->erasesize;
 430                 info.writesize  = mtd->writesize;
 431                 info.oobsize    = mtd->oobsize;
 432                 /* The below fields are obsolete */
 433                 info.ecctype    = -1;
 434                 info.eccsize    = 0;
 435                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 436                         return -EFAULT;
 437                 break;
 438
 439         case MEMERASE:
 440         {
 441                 struct erase_info *erase;
 442
 443                 if(!(file->f_mode & 2))
 444                         return -EPERM;
 445
 446                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 447                 if (!erase)
 448                         ret = -ENOMEM;
 449                 else {
 450                         wait_queue_head_t waitq;
 451                         DECLARE_WAITQUEUE(wait, current);
 452
 453                         init_waitqueue_head(&waitq);
 454
 455                         if (copy_from_user(&erase->addr, argp,
 456                                     sizeof(struct erase_info_user))) {
 457                                 kfree(erase);
 458                                 return -EFAULT;
 459                         }
 460                         erase->mtd = mtd;
 461                         erase->callback = mtdchar_erase_callback;
 462                         erase->priv = (unsigned long)&waitq;
 463
 464                         /*
 465                           FIXME: Allow INTERRUPTIBLE. Which means
 466                           not having the wait_queue head on the stack.
 467
 468                           If the wq_head is on the stack, and we
 469                           leave because we got interrupted, then the
 470                           wq_head is no longer there when the
 471                           callback routine tries to wake us up.
 472                         */
 473                         ret = mtd->erase(mtd, erase);
 474                         if (!ret) {
 475                                 set_current_state(TASK_UNINTERRUPTIBLE);
 476                                 add_wait_queue(&waitq, &wait);
 477                                 if (erase->state != MTD_ERASE_DONE &&
 478                                     erase->state != MTD_ERASE_FAILED)
 479                                         schedule();
 480                                 remove_wait_queue(&waitq, &wait);
 481                                 set_current_state(TASK_RUNNING);
 482
 483                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 484                         }
 485                         kfree(erase);
 486                 }
 487                 break;
 488         }
 489
 490         case MEMWRITEOOB:
 491         {
 492                 struct mtd_oob_buf buf;
 493                 struct mtd_oob_ops ops;
 494                 uint32_t retlen;
 495
 496                 if(!(file->f_mode & 2))
 497                         return -EPERM;
 498
 499                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 500                         return -EFAULT;
 501
 502                 if (buf.length > 4096)
 503                         return -EINVAL;
 504
 505                 if (!mtd->write_oob)
 506                         ret = -EOPNOTSUPP;
 507                 else
 508                         ret = access_ok(VERIFY_READ, buf.ptr,
 509                                         buf.length) ? 0 : EFAULT;
 510
 511                 if (ret)
 512                         return ret;
 513
 514                 ops.ooblen = buf.length;
 515                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 516                 ops.datbuf = NULL;
 517                 ops.mode = MTD_OOB_PLACE;
 518
 519                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 520                         return -EINVAL;
 521
 522                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 523                 if (!ops.oobbuf)
 524                         return -ENOMEM;
 525
 526                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 527                         kfree(ops.oobbuf);
 528                         return -EFAULT;
 529                 }
 530
 531                 buf.start &= ~(mtd->oobsize - 1);
 532                 ret = mtd->write_oob(mtd, buf.start, &ops);
 533
 534                 if (ops.oobretlen > 0xFFFFFFFFU)
 535                         ret = -EOVERFLOW;
 536                 retlen = ops.oobretlen;
 537                 if (copy_to_user(&((struct mtd_oob_buf *)argp)->length,
 538                                  &retlen, sizeof(buf.length)))
 539                         ret = -EFAULT;
 540
 541                 kfree(ops.oobbuf);
 542                 break;
 543
 544         }
 545
 546         case MEMREADOOB:
 547         {
 548                 struct mtd_oob_buf buf;
 549                 struct mtd_oob_ops ops;
 550
 551                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 552                         return -EFAULT;
 553
 554                 if (buf.length > 4096)
 555                         return -EINVAL;
 556
 557                 if (!mtd->read_oob)
 558                         ret = -EOPNOTSUPP;
 559                 else
 560                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 561                                         buf.length) ? 0 : -EFAULT;
 562                 if (ret)
 563                         return ret;
 564
 565                 ops.ooblen = buf.length;
 566                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 567                 ops.datbuf = NULL;
 568                 ops.mode = MTD_OOB_PLACE;
 569
 570                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 571                         return -EINVAL;
 572
 573                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 574                 if (!ops.oobbuf)
 575                         return -ENOMEM;
 576
 577                 buf.start &= ~(mtd->oobsize - 1);
 578                 ret = mtd->read_oob(mtd, buf.start, &ops);
 579
 580                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 581                         ret = -EFAULT;
 582                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 583                                                     ops.oobretlen))
 584                         ret = -EFAULT;
 585
 586                 kfree(ops.oobbuf);
 587                 break;
 588         }
 589
 590         case MEMLOCK:
 591         {
 592                 struct erase_info_user info;
 593
 594                 if (copy_from_user(&info, argp, sizeof(info)))
 595                         return -EFAULT;
 596
 597                 if (!mtd->lock)
 598                         ret = -EOPNOTSUPP;
 599                 else
 600                         ret = mtd->lock(mtd, info.start, info.length);
 601                 break;
 602         }
 603
 604         case MEMUNLOCK:
 605         {
 606                 struct erase_info_user info;
 607
 608                 if (copy_from_user(&info, argp, sizeof(info)))
 609                         return -EFAULT;
 610
 611                 if (!mtd->unlock)
 612                         ret = -EOPNOTSUPP;
 613                 else
 614                         ret = mtd->unlock(mtd, info.start, info.length);
 615                 break;
 616         }
 617
 618         /* Legacy interface */
 619         case MEMGETOOBSEL:
 620         {
 621                 struct nand_oobinfo oi;
 622
 623                 if (!mtd->ecclayout)
 624                         return -EOPNOTSUPP;
 625                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 626                         return -EINVAL;
 627
 628                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 629                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 630                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 631                        sizeof(oi.oobfree));
 632                 oi.eccbytes = mtd->ecclayout->eccbytes;
 633
 634                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 635                         return -EFAULT;
 636                 break;
 637         }
 638
 639         case MEMGETBADBLOCK:
 640         {
 641                 loff_t offs;
 642
 643                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 644                         return -EFAULT;
 645                 if (!mtd->block_isbad)
 646                         ret = -EOPNOTSUPP;
 647                 else
 648                         return mtd->block_isbad(mtd, offs);
 649                 break;
 650         }
 651
 652         case MEMSETBADBLOCK:
 653         {
 654                 loff_t offs;
 655
 656                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 657                         return -EFAULT;
 658                 if (!mtd->block_markbad)
 659                         ret = -EOPNOTSUPP;
 660                 else
 661                         return mtd->block_markbad(mtd, offs);
 662                 break;
 663         }
 664
 665 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 666         case OTPSELECT:
 667         {
 668                 int mode;
 669                 if (copy_from_user(&mode, argp, sizeof(int)))
 670                         return -EFAULT;
 671
 672                 mfi->mode = MTD_MODE_NORMAL;
 673
 674                 ret = otp_select_filemode(mfi, mode);
 675
 676                 file->f_pos = 0;
 677                 break;
 678         }
 679
 680         case OTPGETREGIONCOUNT:
 681         case OTPGETREGIONINFO:
 682         {
 683                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 684                 if (!buf)
 685                         return -ENOMEM;
 686                 ret = -EOPNOTSUPP;
 687                 switch (mfi->mode) {
 688                 case MTD_MODE_OTP_FACTORY:
 689                         if (mtd->get_fact_prot_info)
 690                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 691                         break;
 692                 case MTD_MODE_OTP_USER:
 693                         if (mtd->get_user_prot_info)
 694                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 695                         break;
 696                 default:
 697                         break;
 698                 }
 699                 if (ret >= 0) {
 700                         if (cmd == OTPGETREGIONCOUNT) {
 701                                 int nbr = ret / sizeof(struct otp_info);
 702                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 703                         } else
 704                                 ret = copy_to_user(argp, buf, ret);
 705                         if (ret)
 706                                 ret = -EFAULT;
 707                 }
 708                 kfree(buf);
 709                 break;
 710         }
 711
 712         case OTPLOCK:
 713         {
 714                 struct otp_info info;
 715
 716                 if (mfi->mode != MTD_MODE_OTP_USER)
 717                         return -EINVAL;
 718                 if (copy_from_user(&info, argp, sizeof(info)))
 719                         return -EFAULT;
 720                 if (!mtd->lock_user_prot_reg)
 721                         return -EOPNOTSUPP;
 722                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 723                 break;
 724         }
 725 #endif
 726
 727         case ECCGETLAYOUT:
 728         {
 729                 if (!mtd->ecclayout)
 730                         return -EOPNOTSUPP;
 731
 732                 if (copy_to_user(argp, mtd->ecclayout,
 733                                  sizeof(struct nand_ecclayout)))
 734                         return -EFAULT;
 735                 break;
 736         }
 737
 738         case ECCGETSTATS:
 739         {
 740                 if (copy_to_user(argp, &mtd->ecc_stats,
 741                                  sizeof(struct mtd_ecc_stats)))
 742                         return -EFAULT;
 743                 break;
 744         }
 745
 746         case MTDFILEMODE:
 747         {
 748                 mfi->mode = 0;
 749
 750                 switch(arg) {
 751                 case MTD_MODE_OTP_FACTORY:
 752                 case MTD_MODE_OTP_USER:
 753                         ret = otp_select_filemode(mfi, arg);
 754                         break;
 755
 756                 case MTD_MODE_RAW:
 757                         if (!mtd->read_oob || !mtd->write_oob)
 758                                 return -EOPNOTSUPP;
 759                         mfi->mode = arg;
 760
 761                 case MTD_MODE_NORMAL:
 762                         break;
 763                 default:
 764                         ret = -EINVAL;
 765                 }
 766                 file->f_pos = 0;
 767                 break;
 768         }
 769
 770         default:
 771                 ret = -ENOTTY;
 772         }
 773
 774         return ret;
 775 } /* memory_ioctl */
 776
 777 static const struct file_operations mtd_fops = {
 778         .owner          = THIS_MODULE,
 779         .llseek         = mtd_lseek,
 780         .read           = mtd_read,
 781         .write          = mtd_write,
 782         .ioctl          = mtd_ioctl,
 783         .open           = mtd_open,
 784         .release        = mtd_close,
 785 };
 786
 787 static int __init init_mtdchar(void)
 788 {
 789         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 790                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 791                        MTD_CHAR_MAJOR);
 792                 return -EAGAIN;
 793         }
 794
 795         mtd_class = class_create(THIS_MODULE, "mtd");
 796
 797         if (IS_ERR(mtd_class)) {
 798                 printk(KERN_ERR "Error creating mtd class.\n");
 799                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 800                 return PTR_ERR(mtd_class);
 801         }
 802
 803         register_mtd_user(&notifier);
 804         return 0;
 805 }
 806
 807 static void __exit cleanup_mtdchar(void)
 808 {
 809         unregister_mtd_user(&notifier);
 810         class_destroy(mtd_class);
 811         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 812 }
 813
 814 module_init(init_mtdchar);
 815 module_exit(cleanup_mtdchar);
 816
 817
 818 MODULE_LICENSE("GPL");
 819 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 820 MODULE_DESCRIPTION("Direct character-device access to MTD devices");