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/err.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 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         struct mtd_info *mtd;
  91         struct mtd_file_info *mfi;
  92
  93         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  94
  95         if (devnum >= MAX_MTD_DEVICES)
  96                 return -ENODEV;
  97
  98         /* You can't open the RO devices RW */
  99         if ((file->f_mode & 2) && (minor & 1))
 100                 return -EACCES;
 101
 102         mtd = get_mtd_device(NULL, devnum);
 103
 104         if (IS_ERR(mtd))
 105                 return PTR_ERR(mtd);
 106
 107         if (MTD_ABSENT == mtd->type) {
 108                 put_mtd_device(mtd);
 109                 return -ENODEV;
 110         }
 111
 112         /* You can't open it RW if it's not a writeable device */
 113         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 114                 put_mtd_device(mtd);
 115                 return -EACCES;
 116         }
 117
 118         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 119         if (!mfi) {
 120                 put_mtd_device(mtd);
 121                 return -ENOMEM;
 122         }
 123         mfi->mtd = mtd;
 124         file->private_data = mfi;
 125
 126         return 0;
 127 } /* mtd_open */
 128
 129 /*====================================================================*/
 130
 131 static int mtd_close(struct inode *inode, struct file *file)
 132 {
 133         struct mtd_file_info *mfi = file->private_data;
 134         struct mtd_info *mtd = mfi->mtd;
 135
 136         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 137
 138         if (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                 info.ecctype    = mtd->ecctype;
 423                 info.eccsize    = mtd->eccsize;
 424                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 425                         return -EFAULT;
 426                 break;
 427
 428         case MEMERASE:
 429         {
 430                 struct erase_info *erase;
 431
 432                 if(!(file->f_mode & 2))
 433                         return -EPERM;
 434
 435                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 436                 if (!erase)
 437                         ret = -ENOMEM;
 438                 else {
 439                         wait_queue_head_t waitq;
 440                         DECLARE_WAITQUEUE(wait, current);
 441
 442                         init_waitqueue_head(&waitq);
 443
 444                         if (copy_from_user(&erase->addr, argp,
 445                                     sizeof(struct erase_info_user))) {
 446                                 kfree(erase);
 447                                 return -EFAULT;
 448                         }
 449                         erase->mtd = mtd;
 450                         erase->callback = mtdchar_erase_callback;
 451                         erase->priv = (unsigned long)&waitq;
 452
 453                         /*
 454                           FIXME: Allow INTERRUPTIBLE. Which means
 455                           not having the wait_queue head on the stack.
 456
 457                           If the wq_head is on the stack, and we
 458                           leave because we got interrupted, then the
 459                           wq_head is no longer there when the
 460                           callback routine tries to wake us up.
 461                         */
 462                         ret = mtd->erase(mtd, erase);
 463                         if (!ret) {
 464                                 set_current_state(TASK_UNINTERRUPTIBLE);
 465                                 add_wait_queue(&waitq, &wait);
 466                                 if (erase->state != MTD_ERASE_DONE &&
 467                                     erase->state != MTD_ERASE_FAILED)
 468                                         schedule();
 469                                 remove_wait_queue(&waitq, &wait);
 470                                 set_current_state(TASK_RUNNING);
 471
 472                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 473                         }
 474                         kfree(erase);
 475                 }
 476                 break;
 477         }
 478
 479         case MEMWRITEOOB:
 480         {
 481                 struct mtd_oob_buf buf;
 482                 struct mtd_oob_ops ops;
 483
 484                 if(!(file->f_mode & 2))
 485                         return -EPERM;
 486
 487                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 488                         return -EFAULT;
 489
 490                 if (buf.length > 4096)
 491                         return -EINVAL;
 492
 493                 if (!mtd->write_oob)
 494                         ret = -EOPNOTSUPP;
 495                 else
 496                         ret = access_ok(VERIFY_READ, buf.ptr,
 497                                         buf.length) ? 0 : EFAULT;
 498
 499                 if (ret)
 500                         return ret;
 501
 502                 ops.ooblen = buf.length;
 503                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 504                 ops.datbuf = NULL;
 505                 ops.mode = MTD_OOB_PLACE;
 506
 507                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 508                         return -EINVAL;
 509
 510                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 511                 if (!ops.oobbuf)
 512                         return -ENOMEM;
 513
 514                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 515                         kfree(ops.oobbuf);
 516                         return -EFAULT;
 517                 }
 518
 519                 buf.start &= ~(mtd->oobsize - 1);
 520                 ret = mtd->write_oob(mtd, buf.start, &ops);
 521
 522                 if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen,
 523                                  sizeof(uint32_t)))
 524                         ret = -EFAULT;
 525
 526                 kfree(ops.oobbuf);
 527                 break;
 528
 529         }
 530
 531         case MEMREADOOB:
 532         {
 533                 struct mtd_oob_buf buf;
 534                 struct mtd_oob_ops ops;
 535
 536                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 537                         return -EFAULT;
 538
 539                 if (buf.length > 4096)
 540                         return -EINVAL;
 541
 542                 if (!mtd->read_oob)
 543                         ret = -EOPNOTSUPP;
 544                 else
 545                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 546                                         buf.length) ? 0 : -EFAULT;
 547                 if (ret)
 548                         return ret;
 549
 550                 ops.ooblen = buf.length;
 551                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 552                 ops.datbuf = NULL;
 553                 ops.mode = MTD_OOB_PLACE;
 554
 555                 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 556                         return -EINVAL;
 557
 558                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 559                 if (!ops.oobbuf)
 560                         return -ENOMEM;
 561
 562                 buf.start &= ~(mtd->oobsize - 1);
 563                 ret = mtd->read_oob(mtd, buf.start, &ops);
 564
 565                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 566                         ret = -EFAULT;
 567                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 568                                                     ops.oobretlen))
 569                         ret = -EFAULT;
 570
 571                 kfree(ops.oobbuf);
 572                 break;
 573         }
 574
 575         case MEMLOCK:
 576         {
 577                 struct erase_info_user info;
 578
 579                 if (copy_from_user(&info, argp, sizeof(info)))
 580                         return -EFAULT;
 581
 582                 if (!mtd->lock)
 583                         ret = -EOPNOTSUPP;
 584                 else
 585                         ret = mtd->lock(mtd, info.start, info.length);
 586                 break;
 587         }
 588
 589         case MEMUNLOCK:
 590         {
 591                 struct erase_info_user info;
 592
 593                 if (copy_from_user(&info, argp, sizeof(info)))
 594                         return -EFAULT;
 595
 596                 if (!mtd->unlock)
 597                         ret = -EOPNOTSUPP;
 598                 else
 599                         ret = mtd->unlock(mtd, info.start, info.length);
 600                 break;
 601         }
 602
 603         /* Legacy interface */
 604         case MEMGETOOBSEL:
 605         {
 606                 struct nand_oobinfo oi;
 607
 608                 if (!mtd->ecclayout)
 609                         return -EOPNOTSUPP;
 610                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 611                         return -EINVAL;
 612
 613                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 614                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 615                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 616                        sizeof(oi.oobfree));
 617                 oi.eccbytes = mtd->ecclayout->eccbytes;
 618
 619                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 620                         return -EFAULT;
 621                 break;
 622         }
 623
 624         case MEMGETBADBLOCK:
 625         {
 626                 loff_t offs;
 627
 628                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 629                         return -EFAULT;
 630                 if (!mtd->block_isbad)
 631                         ret = -EOPNOTSUPP;
 632                 else
 633                         return mtd->block_isbad(mtd, offs);
 634                 break;
 635         }
 636
 637         case MEMSETBADBLOCK:
 638         {
 639                 loff_t offs;
 640
 641                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 642                         return -EFAULT;
 643                 if (!mtd->block_markbad)
 644                         ret = -EOPNOTSUPP;
 645                 else
 646                         return mtd->block_markbad(mtd, offs);
 647                 break;
 648         }
 649
 650 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 651         case OTPSELECT:
 652         {
 653                 int mode;
 654                 if (copy_from_user(&mode, argp, sizeof(int)))
 655                         return -EFAULT;
 656
 657                 mfi->mode = MTD_MODE_NORMAL;
 658
 659                 ret = otp_select_filemode(mfi, mode);
 660
 661                 file->f_pos = 0;
 662                 break;
 663         }
 664
 665         case OTPGETREGIONCOUNT:
 666         case OTPGETREGIONINFO:
 667         {
 668                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 669                 if (!buf)
 670                         return -ENOMEM;
 671                 ret = -EOPNOTSUPP;
 672                 switch (mfi->mode) {
 673                 case MTD_MODE_OTP_FACTORY:
 674                         if (mtd->get_fact_prot_info)
 675                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 676                         break;
 677                 case MTD_MODE_OTP_USER:
 678                         if (mtd->get_user_prot_info)
 679                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 680                         break;
 681                 default:
 682                         break;
 683                 }
 684                 if (ret >= 0) {
 685                         if (cmd == OTPGETREGIONCOUNT) {
 686                                 int nbr = ret / sizeof(struct otp_info);
 687                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 688                         } else
 689                                 ret = copy_to_user(argp, buf, ret);
 690                         if (ret)
 691                                 ret = -EFAULT;
 692                 }
 693                 kfree(buf);
 694                 break;
 695         }
 696
 697         case OTPLOCK:
 698         {
 699                 struct otp_info info;
 700
 701                 if (mfi->mode != MTD_MODE_OTP_USER)
 702                         return -EINVAL;
 703                 if (copy_from_user(&info, argp, sizeof(info)))
 704                         return -EFAULT;
 705                 if (!mtd->lock_user_prot_reg)
 706                         return -EOPNOTSUPP;
 707                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 708                 break;
 709         }
 710 #endif
 711
 712         case ECCGETLAYOUT:
 713         {
 714                 if (!mtd->ecclayout)
 715                         return -EOPNOTSUPP;
 716
 717                 if (copy_to_user(argp, mtd->ecclayout,
 718                                  sizeof(struct nand_ecclayout)))
 719                         return -EFAULT;
 720                 break;
 721         }
 722
 723         case ECCGETSTATS:
 724         {
 725                 if (copy_to_user(argp, &mtd->ecc_stats,
 726                                  sizeof(struct mtd_ecc_stats)))
 727                         return -EFAULT;
 728                 break;
 729         }
 730
 731         case MTDFILEMODE:
 732         {
 733                 mfi->mode = 0;
 734
 735                 switch(arg) {
 736                 case MTD_MODE_OTP_FACTORY:
 737                 case MTD_MODE_OTP_USER:
 738                         ret = otp_select_filemode(mfi, arg);
 739                         break;
 740
 741                 case MTD_MODE_RAW:
 742                         if (!mtd->read_oob || !mtd->write_oob)
 743                                 return -EOPNOTSUPP;
 744                         mfi->mode = arg;
 745
 746                 case MTD_MODE_NORMAL:
 747                         break;
 748                 default:
 749                         ret = -EINVAL;
 750                 }
 751                 file->f_pos = 0;
 752                 break;
 753         }
 754
 755         default:
 756                 ret = -ENOTTY;
 757         }
 758
 759         return ret;
 760 } /* memory_ioctl */
 761
 762 static struct file_operations mtd_fops = {
 763         .owner          = THIS_MODULE,
 764         .llseek         = mtd_lseek,
 765         .read           = mtd_read,
 766         .write          = mtd_write,
 767         .ioctl          = mtd_ioctl,
 768         .open           = mtd_open,
 769         .release        = mtd_close,
 770 };
 771
 772 static int __init init_mtdchar(void)
 773 {
 774         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 775                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 776                        MTD_CHAR_MAJOR);
 777                 return -EAGAIN;
 778         }
 779
 780         mtd_class = class_create(THIS_MODULE, "mtd");
 781
 782         if (IS_ERR(mtd_class)) {
 783                 printk(KERN_ERR "Error creating mtd class.\n");
 784                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 785                 return PTR_ERR(mtd_class);
 786         }
 787
 788         register_mtd_user(&notifier);
 789         return 0;
 790 }
 791
 792 static void __exit cleanup_mtdchar(void)
 793 {
 794         unregister_mtd_user(&notifier);
 795         class_destroy(mtd_class);
 796         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 797 }
 798
 799 module_init(init_mtdchar);
 800 module_exit(cleanup_mtdchar);
 801
 802
 803 MODULE_LICENSE("GPL");
 804 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 805 MODULE_DESCRIPTION("Direct character-device access to MTD devices");