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/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/sched.h>
  15
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/compatmac.h>
  18
  19 #include <asm/uaccess.h>
  20
  21 static struct class *mtd_class;
  22
  23 static void mtd_notify_add(struct mtd_info* mtd)
  24 {
  25         if (!mtd)
  26                 return;
  27
  28         class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  29                             NULL, "mtd%d", mtd->index);
  30
  31         class_device_create(mtd_class, NULL,
  32                             MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
  33                             NULL, "mtd%dro", mtd->index);
  34 }
  35
  36 static void mtd_notify_remove(struct mtd_info* mtd)
  37 {
  38         if (!mtd)
  39                 return;
  40
  41         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  42         class_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 (!mtd)
 104                 return -ENODEV;
 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         if (mtd->sync)
 138                 mtd->sync(mtd);
 139
 140         put_mtd_device(mtd);
 141         file->private_data = NULL;
 142         kfree(mfi);
 143
 144         return 0;
 145 } /* mtd_close */
 146
 147 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 148    userspace buffer down and use it directly with readv/writev.
 149 */
 150 #define MAX_KMALLOC_SIZE 0x20000
 151
 152 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 153 {
 154         struct mtd_file_info *mfi = file->private_data;
 155         struct mtd_info *mtd = mfi->mtd;
 156         size_t retlen=0;
 157         size_t total_retlen=0;
 158         int ret=0;
 159         int len;
 160         char *kbuf;
 161
 162         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 163
 164         if (*ppos + count > mtd->size)
 165                 count = mtd->size - *ppos;
 166
 167         if (!count)
 168                 return 0;
 169
 170         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 171            and pass them directly to the MTD functions */
 172
 173         if (count > MAX_KMALLOC_SIZE)
 174                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 175         else
 176                 kbuf=kmalloc(count, GFP_KERNEL);
 177
 178         if (!kbuf)
 179                 return -ENOMEM;
 180
 181         while (count) {
 182
 183                 if (count > MAX_KMALLOC_SIZE)
 184                         len = MAX_KMALLOC_SIZE;
 185                 else
 186                         len = count;
 187
 188                 switch (mfi->mode) {
 189                 case MTD_MODE_OTP_FACTORY:
 190                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 191                         break;
 192                 case MTD_MODE_OTP_USER:
 193                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 194                         break;
 195                 case MTD_MODE_RAW:
 196                 {
 197                         struct mtd_oob_ops ops;
 198
 199                         ops.mode = MTD_OOB_RAW;
 200                         ops.datbuf = kbuf;
 201                         ops.oobbuf = NULL;
 202                         ops.len = len;
 203
 204                         ret = mtd->read_oob(mtd, *ppos, &ops);
 205                         retlen = ops.retlen;
 206                         break;
 207                 }
 208                 default:
 209                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 210                 }
 211                 /* Nand returns -EBADMSG on ecc errors, but it returns
 212                  * the data. For our userspace tools it is important
 213                  * to dump areas with ecc errors !
 214                  * For kernel internal usage it also might return -EUCLEAN
 215                  * to signal the caller that a bitflip has occured and has
 216                  * been corrected by the ECC algorithm.
 217                  * Userspace software which accesses NAND this way
 218                  * must be aware of the fact that it deals with NAND
 219                  */
 220                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 221                         *ppos += retlen;
 222                         if (copy_to_user(buf, kbuf, retlen)) {
 223                                 kfree(kbuf);
 224                                 return -EFAULT;
 225                         }
 226                         else
 227                                 total_retlen += retlen;
 228
 229                         count -= retlen;
 230                         buf += retlen;
 231                         if (retlen == 0)
 232                                 count = 0;
 233                 }
 234                 else {
 235                         kfree(kbuf);
 236                         return ret;
 237                 }
 238
 239         }
 240
 241         kfree(kbuf);
 242         return total_retlen;
 243 } /* mtd_read */
 244
 245 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 246 {
 247         struct mtd_file_info *mfi = file->private_data;
 248         struct mtd_info *mtd = mfi->mtd;
 249         char *kbuf;
 250         size_t retlen;
 251         size_t total_retlen=0;
 252         int ret=0;
 253         int len;
 254
 255         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 256
 257         if (*ppos == mtd->size)
 258                 return -ENOSPC;
 259
 260         if (*ppos + count > mtd->size)
 261                 count = mtd->size - *ppos;
 262
 263         if (!count)
 264                 return 0;
 265
 266         if (count > MAX_KMALLOC_SIZE)
 267                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 268         else
 269                 kbuf=kmalloc(count, GFP_KERNEL);
 270
 271         if (!kbuf)
 272                 return -ENOMEM;
 273
 274         while (count) {
 275
 276                 if (count > MAX_KMALLOC_SIZE)
 277                         len = MAX_KMALLOC_SIZE;
 278                 else
 279                         len = count;
 280
 281                 if (copy_from_user(kbuf, buf, len)) {
 282                         kfree(kbuf);
 283                         return -EFAULT;
 284                 }
 285
 286                 switch (mfi->mode) {
 287                 case MTD_MODE_OTP_FACTORY:
 288                         ret = -EROFS;
 289                         break;
 290                 case MTD_MODE_OTP_USER:
 291                         if (!mtd->write_user_prot_reg) {
 292                                 ret = -EOPNOTSUPP;
 293                                 break;
 294                         }
 295                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 296                         break;
 297
 298                 case MTD_MODE_RAW:
 299                 {
 300                         struct mtd_oob_ops ops;
 301
 302                         ops.mode = MTD_OOB_RAW;
 303                         ops.datbuf = kbuf;
 304                         ops.oobbuf = NULL;
 305                         ops.len = len;
 306
 307                         ret = mtd->write_oob(mtd, *ppos, &ops);
 308                         retlen = ops.retlen;
 309                         break;
 310                 }
 311
 312                 default:
 313                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 314                 }
 315                 if (!ret) {
 316                         *ppos += retlen;
 317                         total_retlen += retlen;
 318                         count -= retlen;
 319                         buf += retlen;
 320                 }
 321                 else {
 322                         kfree(kbuf);
 323                         return ret;
 324                 }
 325         }
 326
 327         kfree(kbuf);
 328         return total_retlen;
 329 } /* mtd_write */
 330
 331 /*======================================================================
 332
 333     IOCTL calls for getting device parameters.
 334
 335 ======================================================================*/
 336 static void mtdchar_erase_callback (struct erase_info *instr)
 337 {
 338         wake_up((wait_queue_head_t *)instr->priv);
 339 }
 340
 341 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 342 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 343 {
 344         struct mtd_info *mtd = mfi->mtd;
 345         int ret = 0;
 346
 347         switch (mode) {
 348         case MTD_OTP_FACTORY:
 349                 if (!mtd->read_fact_prot_reg)
 350                         ret = -EOPNOTSUPP;
 351                 else
 352                         mfi->mode = MTD_MODE_OTP_FACTORY;
 353                 break;
 354         case MTD_OTP_USER:
 355                 if (!mtd->read_fact_prot_reg)
 356                         ret = -EOPNOTSUPP;
 357                 else
 358                         mfi->mode = MTD_MODE_OTP_USER;
 359                 break;
 360         default:
 361                 ret = -EINVAL;
 362         case MTD_OTP_OFF:
 363                 break;
 364         }
 365         return ret;
 366 }
 367 #else
 368 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 369 #endif
 370
 371 static int mtd_ioctl(struct inode *inode, struct file *file,
 372                      u_int cmd, u_long arg)
 373 {
 374         struct mtd_file_info *mfi = file->private_data;
 375         struct mtd_info *mtd = mfi->mtd;
 376         void __user *argp = (void __user *)arg;
 377         int ret = 0;
 378         u_long size;
 379         struct mtd_info_user info;
 380
 381         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 382
 383         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 384         if (cmd & IOC_IN) {
 385                 if (!access_ok(VERIFY_READ, argp, size))
 386                         return -EFAULT;
 387         }
 388         if (cmd & IOC_OUT) {
 389                 if (!access_ok(VERIFY_WRITE, argp, size))
 390                         return -EFAULT;
 391         }
 392
 393         switch (cmd) {
 394         case MEMGETREGIONCOUNT:
 395                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 396                         return -EFAULT;
 397                 break;
 398
 399         case MEMGETREGIONINFO:
 400         {
 401                 struct region_info_user ur;
 402
 403                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 404                         return -EFAULT;
 405
 406                 if (ur.regionindex >= mtd->numeraseregions)
 407                         return -EINVAL;
 408                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 409                                 sizeof(struct mtd_erase_region_info)))
 410                         return -EFAULT;
 411                 break;
 412         }
 413
 414         case MEMGETINFO:
 415                 info.type       = mtd->type;
 416                 info.flags      = mtd->flags;
 417                 info.size       = mtd->size;
 418                 info.erasesize  = mtd->erasesize;
 419                 info.writesize  = mtd->writesize;
 420                 info.oobsize    = mtd->oobsize;
 421                 info.ecctype    = mtd->ecctype;
 422                 info.eccsize    = mtd->eccsize;
 423                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 424                         return -EFAULT;
 425                 break;
 426
 427         case MEMERASE:
 428         {
 429                 struct erase_info *erase;
 430
 431                 if(!(file->f_mode & 2))
 432                         return -EPERM;
 433
 434                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 435                 if (!erase)
 436                         ret = -ENOMEM;
 437                 else {
 438                         wait_queue_head_t waitq;
 439                         DECLARE_WAITQUEUE(wait, current);
 440
 441                         init_waitqueue_head(&waitq);
 442
 443                         if (copy_from_user(&erase->addr, argp,
 444                                     sizeof(struct erase_info_user))) {
 445                                 kfree(erase);
 446                                 return -EFAULT;
 447                         }
 448                         erase->mtd = mtd;
 449                         erase->callback = mtdchar_erase_callback;
 450                         erase->priv = (unsigned long)&waitq;
 451
 452                         /*
 453                           FIXME: Allow INTERRUPTIBLE. Which means
 454                           not having the wait_queue head on the stack.
 455
 456                           If the wq_head is on the stack, and we
 457                           leave because we got interrupted, then the
 458                           wq_head is no longer there when the
 459                           callback routine tries to wake us up.
 460                         */
 461                         ret = mtd->erase(mtd, erase);
 462                         if (!ret) {
 463                                 set_current_state(TASK_UNINTERRUPTIBLE);
 464                                 add_wait_queue(&waitq, &wait);
 465                                 if (erase->state != MTD_ERASE_DONE &&
 466                                     erase->state != MTD_ERASE_FAILED)
 467                                         schedule();
 468                                 remove_wait_queue(&waitq, &wait);
 469                                 set_current_state(TASK_RUNNING);
 470
 471                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 472                         }
 473                         kfree(erase);
 474                 }
 475                 break;
 476         }
 477
 478         case MEMWRITEOOB:
 479         {
 480                 struct mtd_oob_buf buf;
 481                 struct mtd_oob_ops ops;
 482
 483                 if(!(file->f_mode & 2))
 484                         return -EPERM;
 485
 486                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 487                         return -EFAULT;
 488
 489                 if (buf.length > 4096)
 490                         return -EINVAL;
 491
 492                 if (!mtd->write_oob)
 493                         ret = -EOPNOTSUPP;
 494                 else
 495                         ret = access_ok(VERIFY_READ, buf.ptr,
 496                                         buf.length) ? 0 : EFAULT;
 497
 498                 if (ret)
 499                         return ret;
 500
 501                 ops.ooblen = buf.length;
 502                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 503                 ops.datbuf = NULL;
 504                 ops.mode = MTD_OOB_PLACE;
 505
 506                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 507                         return -EINVAL;
 508
 509                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 510                 if (!ops.oobbuf)
 511                         return -ENOMEM;
 512
 513                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 514                         kfree(ops.oobbuf);
 515                         return -EFAULT;
 516                 }
 517
 518                 buf.start &= ~(mtd->oobsize - 1);
 519                 ret = mtd->write_oob(mtd, buf.start, &ops);
 520
 521                 if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen,
 522                                  sizeof(uint32_t)))
 523                         ret = -EFAULT;
 524
 525                 kfree(ops.oobbuf);
 526                 break;
 527
 528         }
 529
 530         case MEMREADOOB:
 531         {
 532                 struct mtd_oob_buf buf;
 533                 struct mtd_oob_ops ops;
 534
 535                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 536                         return -EFAULT;
 537
 538                 if (buf.length > 4096)
 539                         return -EINVAL;
 540
 541                 if (!mtd->read_oob)
 542                         ret = -EOPNOTSUPP;
 543                 else
 544                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 545                                         buf.length) ? 0 : -EFAULT;
 546                 if (ret)
 547                         return ret;
 548
 549                 ops.ooblen = buf.length;
 550                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 551                 ops.datbuf = NULL;
 552                 ops.mode = MTD_OOB_PLACE;
 553
 554                 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 555                         return -EINVAL;
 556
 557                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 558                 if (!ops.oobbuf)
 559                         return -ENOMEM;
 560
 561                 buf.start &= ~(mtd->oobsize - 1);
 562                 ret = mtd->read_oob(mtd, buf.start, &ops);
 563
 564                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 565                         ret = -EFAULT;
 566                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 567                                                     ops.oobretlen))
 568                         ret = -EFAULT;
 569
 570                 kfree(ops.oobbuf);
 571                 break;
 572         }
 573
 574         case MEMLOCK:
 575         {
 576                 struct erase_info_user info;
 577
 578                 if (copy_from_user(&info, argp, sizeof(info)))
 579                         return -EFAULT;
 580
 581                 if (!mtd->lock)
 582                         ret = -EOPNOTSUPP;
 583                 else
 584                         ret = mtd->lock(mtd, info.start, info.length);
 585                 break;
 586         }
 587
 588         case MEMUNLOCK:
 589         {
 590                 struct erase_info_user info;
 591
 592                 if (copy_from_user(&info, argp, sizeof(info)))
 593                         return -EFAULT;
 594
 595                 if (!mtd->unlock)
 596                         ret = -EOPNOTSUPP;
 597                 else
 598                         ret = mtd->unlock(mtd, info.start, info.length);
 599                 break;
 600         }
 601
 602         /* Legacy interface */
 603         case MEMGETOOBSEL:
 604         {
 605                 struct nand_oobinfo oi;
 606
 607                 if (!mtd->ecclayout)
 608                         return -EOPNOTSUPP;
 609                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 610                         return -EINVAL;
 611
 612                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 613                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 614                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 615                        sizeof(oi.oobfree));
 616                 oi.eccbytes = mtd->ecclayout->eccbytes;
 617
 618                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 619                         return -EFAULT;
 620                 break;
 621         }
 622
 623         case MEMGETBADBLOCK:
 624         {
 625                 loff_t offs;
 626
 627                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 628                         return -EFAULT;
 629                 if (!mtd->block_isbad)
 630                         ret = -EOPNOTSUPP;
 631                 else
 632                         return mtd->block_isbad(mtd, offs);
 633                 break;
 634         }
 635
 636         case MEMSETBADBLOCK:
 637         {
 638                 loff_t offs;
 639
 640                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 641                         return -EFAULT;
 642                 if (!mtd->block_markbad)
 643                         ret = -EOPNOTSUPP;
 644                 else
 645                         return mtd->block_markbad(mtd, offs);
 646                 break;
 647         }
 648
 649 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 650         case OTPSELECT:
 651         {
 652                 int mode;
 653                 if (copy_from_user(&mode, argp, sizeof(int)))
 654                         return -EFAULT;
 655
 656                 mfi->mode = MTD_MODE_NORMAL;
 657
 658                 ret = otp_select_filemode(mfi, mode);
 659
 660                 file->f_pos = 0;
 661                 break;
 662         }
 663
 664         case OTPGETREGIONCOUNT:
 665         case OTPGETREGIONINFO:
 666         {
 667                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 668                 if (!buf)
 669                         return -ENOMEM;
 670                 ret = -EOPNOTSUPP;
 671                 switch (mfi->mode) {
 672                 case MTD_MODE_OTP_FACTORY:
 673                         if (mtd->get_fact_prot_info)
 674                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 675                         break;
 676                 case MTD_MODE_OTP_USER:
 677                         if (mtd->get_user_prot_info)
 678                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 679                         break;
 680                 default:
 681                         break;
 682                 }
 683                 if (ret >= 0) {
 684                         if (cmd == OTPGETREGIONCOUNT) {
 685                                 int nbr = ret / sizeof(struct otp_info);
 686                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 687                         } else
 688                                 ret = copy_to_user(argp, buf, ret);
 689                         if (ret)
 690                                 ret = -EFAULT;
 691                 }
 692                 kfree(buf);
 693                 break;
 694         }
 695
 696         case OTPLOCK:
 697         {
 698                 struct otp_info info;
 699
 700                 if (mfi->mode != MTD_MODE_OTP_USER)
 701                         return -EINVAL;
 702                 if (copy_from_user(&info, argp, sizeof(info)))
 703                         return -EFAULT;
 704                 if (!mtd->lock_user_prot_reg)
 705                         return -EOPNOTSUPP;
 706                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 707                 break;
 708         }
 709 #endif
 710
 711         case ECCGETLAYOUT:
 712         {
 713                 if (!mtd->ecclayout)
 714                         return -EOPNOTSUPP;
 715
 716                 if (copy_to_user(argp, mtd->ecclayout,
 717                                  sizeof(struct nand_ecclayout)))
 718                         return -EFAULT;
 719                 break;
 720         }
 721
 722         case ECCGETSTATS:
 723         {
 724                 if (copy_to_user(argp, &mtd->ecc_stats,
 725                                  sizeof(struct mtd_ecc_stats)))
 726                         return -EFAULT;
 727                 break;
 728         }
 729
 730         case MTDFILEMODE:
 731         {
 732                 mfi->mode = 0;
 733
 734                 switch(arg) {
 735                 case MTD_MODE_OTP_FACTORY:
 736                 case MTD_MODE_OTP_USER:
 737                         ret = otp_select_filemode(mfi, arg);
 738                         break;
 739
 740                 case MTD_MODE_RAW:
 741                         if (!mtd->read_oob || !mtd->write_oob)
 742                                 return -EOPNOTSUPP;
 743                         mfi->mode = arg;
 744
 745                 case MTD_MODE_NORMAL:
 746                         break;
 747                 default:
 748                         ret = -EINVAL;
 749                 }
 750                 file->f_pos = 0;
 751                 break;
 752         }
 753
 754         default:
 755                 ret = -ENOTTY;
 756         }
 757
 758         return ret;
 759 } /* memory_ioctl */
 760
 761 static struct file_operations mtd_fops = {
 762         .owner          = THIS_MODULE,
 763         .llseek         = mtd_lseek,
 764         .read           = mtd_read,
 765         .write          = mtd_write,
 766         .ioctl          = mtd_ioctl,
 767         .open           = mtd_open,
 768         .release        = mtd_close,
 769 };
 770
 771 static int __init init_mtdchar(void)
 772 {
 773         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 774                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 775                        MTD_CHAR_MAJOR);
 776                 return -EAGAIN;
 777         }
 778
 779         mtd_class = class_create(THIS_MODULE, "mtd");
 780
 781         if (IS_ERR(mtd_class)) {
 782                 printk(KERN_ERR "Error creating mtd class.\n");
 783                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 784                 return PTR_ERR(mtd_class);
 785         }
 786
 787         register_mtd_user(&notifier);
 788         return 0;
 789 }
 790
 791 static void __exit cleanup_mtdchar(void)
 792 {
 793         unregister_mtd_user(&notifier);
 794         class_destroy(mtd_class);
 795         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 796 }
 797
 798 module_init(init_mtdchar);
 799 module_exit(cleanup_mtdchar);
 800
 801
 802 MODULE_LICENSE("GPL");
 803 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 804 MODULE_DESCRIPTION("Direct character-device access to MTD devices");