drivers/mtd/mtdchar.c

   1 /*
   2  * $Id: mtdchar.c,v 1.76 2005/11/07 11:14:20 gleixner Exp $
   3  *
   4  * Character-device access to raw MTD devices.
   5  *
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/fs.h>
  10 #include <linux/mm.h>
  11 #include <linux/err.h>
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched.h>
  17
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/compatmac.h>
  20
  21 #include <asm/uaccess.h>
  22
  23 static struct class *mtd_class;
  24
  25 static void mtd_notify_add(struct mtd_info* mtd)
  26 {
  27         if (!mtd)
  28                 return;
  29
  30         class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  31                             NULL, "mtd%d", mtd->index);
  32
  33         class_device_create(mtd_class, NULL,
  34                             MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
  35                             NULL, "mtd%dro", mtd->index);
  36 }
  37
  38 static void mtd_notify_remove(struct mtd_info* mtd)
  39 {
  40         if (!mtd)
  41                 return;
  42
  43         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  44         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  45 }
  46
  47 static struct mtd_notifier notifier = {
  48         .add    = mtd_notify_add,
  49         .remove = mtd_notify_remove,
  50 };
  51
  52 /*
  53  * Data structure to hold the pointer to the mtd device as well
  54  * as mode information ofr various use cases.
  55  */
  56 struct mtd_file_info {
  57         struct mtd_info *mtd;
  58         enum mtd_file_modes mode;
  59 };
  60
  61 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  62 {
  63         struct mtd_file_info *mfi = file->private_data;
  64         struct mtd_info *mtd = mfi->mtd;
  65
  66         switch (orig) {
  67         case SEEK_SET:
  68                 break;
  69         case SEEK_CUR:
  70                 offset += file->f_pos;
  71                 break;
  72         case SEEK_END:
  73                 offset += mtd->size;
  74                 break;
  75         default:
  76                 return -EINVAL;
  77         }
  78
  79         if (offset >= 0 && offset <= mtd->size)
  80                 return file->f_pos = offset;
  81
  82         return -EINVAL;
  83 }
  84
  85
  86
  87 static int mtd_open(struct inode *inode, struct file *file)
  88 {
  89         int minor = iminor(inode);
  90         int devnum = minor >> 1;
  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         mtd = get_mtd_device(NULL, devnum);
 104
 105         if (IS_ERR(mtd))
 106                 return PTR_ERR(mtd);
 107
 108         if (MTD_ABSENT == mtd->type) {
 109                 put_mtd_device(mtd);
 110                 return -ENODEV;
 111         }
 112
 113         /* You can't open it RW if it's not a writeable device */
 114         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 115                 put_mtd_device(mtd);
 116                 return -EACCES;
 117         }
 118
 119         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 120         if (!mfi) {
 121                 put_mtd_device(mtd);
 122                 return -ENOMEM;
 123         }
 124         mfi->mtd = mtd;
 125         file->private_data = mfi;
 126
 127         return 0;
 128 } /* mtd_open */
 129
 130 /*====================================================================*/
 131
 132 static int mtd_close(struct inode *inode, struct file *file)
 133 {
 134         struct mtd_file_info *mfi = file->private_data;
 135         struct mtd_info *mtd = mfi->mtd;
 136
 137         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 138
 139         if (mtd->sync)
 140                 mtd->sync(mtd);
 141
 142         put_mtd_device(mtd);
 143         file->private_data = NULL;
 144         kfree(mfi);
 145
 146         return 0;
 147 } /* mtd_close */
 148
 149 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 150    userspace buffer down and use it directly with readv/writev.
 151 */
 152 #define MAX_KMALLOC_SIZE 0x20000
 153
 154 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 155 {
 156         struct mtd_file_info *mfi = file->private_data;
 157         struct mtd_info *mtd = mfi->mtd;
 158         size_t retlen=0;
 159         size_t total_retlen=0;
 160         int ret=0;
 161         int len;
 162         char *kbuf;
 163
 164         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 165
 166         if (*ppos + count > mtd->size)
 167                 count = mtd->size - *ppos;
 168
 169         if (!count)
 170                 return 0;
 171
 172         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 173            and pass them directly to the MTD functions */
 174
 175         if (count > MAX_KMALLOC_SIZE)
 176                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 177         else
 178                 kbuf=kmalloc(count, GFP_KERNEL);
 179
 180         if (!kbuf)
 181                 return -ENOMEM;
 182
 183         while (count) {
 184
 185                 if (count > MAX_KMALLOC_SIZE)
 186                         len = MAX_KMALLOC_SIZE;
 187                 else
 188                         len = count;
 189
 190                 switch (mfi->mode) {
 191                 case MTD_MODE_OTP_FACTORY:
 192                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 193                         break;
 194                 case MTD_MODE_OTP_USER:
 195                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 196                         break;
 197                 case MTD_MODE_RAW:
 198                 {
 199                         struct mtd_oob_ops ops;
 200
 201                         ops.mode = MTD_OOB_RAW;
 202                         ops.datbuf = kbuf;
 203                         ops.oobbuf = NULL;
 204                         ops.len = len;
 205
 206                         ret = mtd->read_oob(mtd, *ppos, &ops);
 207                         retlen = ops.retlen;
 208                         break;
 209                 }
 210                 default:
 211                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 212                 }
 213                 /* Nand returns -EBADMSG on ecc errors, but it returns
 214                  * the data. For our userspace tools it is important
 215                  * to dump areas with ecc errors !
 216                  * For kernel internal usage it also might return -EUCLEAN
 217                  * to signal the caller that a bitflip has occured and has
 218                  * been corrected by the ECC algorithm.
 219                  * Userspace software which accesses NAND this way
 220                  * must be aware of the fact that it deals with NAND
 221                  */
 222                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 223                         *ppos += retlen;
 224                         if (copy_to_user(buf, kbuf, retlen)) {
 225                                 kfree(kbuf);
 226                                 return -EFAULT;
 227                         }
 228                         else
 229                                 total_retlen += retlen;
 230
 231                         count -= retlen;
 232                         buf += retlen;
 233                         if (retlen == 0)
 234                                 count = 0;
 235                 }
 236                 else {
 237                         kfree(kbuf);
 238                         return ret;
 239                 }
 240
 241         }
 242
 243         kfree(kbuf);
 244         return total_retlen;
 245 } /* mtd_read */
 246
 247 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 248 {
 249         struct mtd_file_info *mfi = file->private_data;
 250         struct mtd_info *mtd = mfi->mtd;
 251         char *kbuf;
 252         size_t retlen;
 253         size_t total_retlen=0;
 254         int ret=0;
 255         int len;
 256
 257         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 258
 259         if (*ppos == mtd->size)
 260                 return -ENOSPC;
 261
 262         if (*ppos + count > mtd->size)
 263                 count = mtd->size - *ppos;
 264
 265         if (!count)
 266                 return 0;
 267
 268         if (count > MAX_KMALLOC_SIZE)
 269                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 270         else
 271                 kbuf=kmalloc(count, GFP_KERNEL);
 272
 273         if (!kbuf)
 274                 return -ENOMEM;
 275
 276         while (count) {
 277
 278                 if (count > MAX_KMALLOC_SIZE)
 279                         len = MAX_KMALLOC_SIZE;
 280                 else
 281                         len = count;
 282
 283                 if (copy_from_user(kbuf, buf, len)) {
 284                         kfree(kbuf);
 285                         return -EFAULT;
 286                 }
 287
 288                 switch (mfi->mode) {
 289                 case MTD_MODE_OTP_FACTORY:
 290                         ret = -EROFS;
 291                         break;
 292                 case MTD_MODE_OTP_USER:
 293                         if (!mtd->write_user_prot_reg) {
 294                                 ret = -EOPNOTSUPP;
 295                                 break;
 296                         }
 297                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 298                         break;
 299
 300                 case MTD_MODE_RAW:
 301                 {
 302                         struct mtd_oob_ops ops;
 303
 304                         ops.mode = MTD_OOB_RAW;
 305                         ops.datbuf = kbuf;
 306                         ops.oobbuf = NULL;
 307                         ops.len = len;
 308
 309                         ret = mtd->write_oob(mtd, *ppos, &ops);
 310                         retlen = ops.retlen;
 311                         break;
 312                 }
 313
 314                 default:
 315                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 316                 }
 317                 if (!ret) {
 318                         *ppos += retlen;
 319                         total_retlen += retlen;
 320                         count -= retlen;
 321                         buf += retlen;
 322                 }
 323                 else {
 324                         kfree(kbuf);
 325                         return ret;
 326                 }
 327         }
 328
 329         kfree(kbuf);
 330         return total_retlen;
 331 } /* mtd_write */
 332
 333 /*======================================================================
 334
 335     IOCTL calls for getting device parameters.
 336
 337 ======================================================================*/
 338 static void mtdchar_erase_callback (struct erase_info *instr)
 339 {
 340         wake_up((wait_queue_head_t *)instr->priv);
 341 }
 342
 343 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 344 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 345 {
 346         struct mtd_info *mtd = mfi->mtd;
 347         int ret = 0;
 348
 349         switch (mode) {
 350         case MTD_OTP_FACTORY:
 351                 if (!mtd->read_fact_prot_reg)
 352                         ret = -EOPNOTSUPP;
 353                 else
 354                         mfi->mode = MTD_MODE_OTP_FACTORY;
 355                 break;
 356         case MTD_OTP_USER:
 357                 if (!mtd->read_fact_prot_reg)
 358                         ret = -EOPNOTSUPP;
 359                 else
 360                         mfi->mode = MTD_MODE_OTP_USER;
 361                 break;
 362         default:
 363                 ret = -EINVAL;
 364         case MTD_OTP_OFF:
 365                 break;
 366         }
 367         return ret;
 368 }
 369 #else
 370 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 371 #endif
 372
 373 static int mtd_ioctl(struct inode *inode, struct file *file,
 374                      u_int cmd, u_long arg)
 375 {
 376         struct mtd_file_info *mfi = file->private_data;
 377         struct mtd_info *mtd = mfi->mtd;
 378         void __user *argp = (void __user *)arg;
 379         int ret = 0;
 380         u_long size;
 381         struct mtd_info_user info;
 382
 383         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 384
 385         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 386         if (cmd & IOC_IN) {
 387                 if (!access_ok(VERIFY_READ, argp, size))
 388                         return -EFAULT;
 389         }
 390         if (cmd & IOC_OUT) {
 391                 if (!access_ok(VERIFY_WRITE, argp, size))
 392                         return -EFAULT;
 393         }
 394
 395         switch (cmd) {
 396         case MEMGETREGIONCOUNT:
 397                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 398                         return -EFAULT;
 399                 break;
 400
 401         case MEMGETREGIONINFO:
 402         {
 403                 struct region_info_user ur;
 404
 405                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 406                         return -EFAULT;
 407
 408                 if (ur.regionindex >= mtd->numeraseregions)
 409                         return -EINVAL;
 410                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 411                                 sizeof(struct mtd_erase_region_info)))
 412                         return -EFAULT;
 413                 break;
 414         }
 415
 416         case MEMGETINFO:
 417                 info.type       = mtd->type;
 418                 info.flags      = mtd->flags;
 419                 info.size       = mtd->size;
 420                 info.erasesize  = mtd->erasesize;
 421                 info.writesize  = mtd->writesize;
 422                 info.oobsize    = mtd->oobsize;
 423                 /* The below fields are obsolete */
 424                 info.ecctype    = -1;
 425                 info.eccsize    = 0;
 426                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 427                         return -EFAULT;
 428                 break;
 429
 430         case MEMERASE:
 431         {
 432                 struct erase_info *erase;
 433
 434                 if(!(file->f_mode & 2))
 435                         return -EPERM;
 436
 437                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 438                 if (!erase)
 439                         ret = -ENOMEM;
 440                 else {
 441                         wait_queue_head_t waitq;
 442                         DECLARE_WAITQUEUE(wait, current);
 443
 444                         init_waitqueue_head(&waitq);
 445
 446                         if (copy_from_user(&erase->addr, argp,
 447                                     sizeof(struct erase_info_user))) {
 448                                 kfree(erase);
 449                                 return -EFAULT;
 450                         }
 451                         erase->mtd = mtd;
 452                         erase->callback = mtdchar_erase_callback;
 453                         erase->priv = (unsigned long)&waitq;
 454
 455                         /*
 456                           FIXME: Allow INTERRUPTIBLE. Which means
 457                           not having the wait_queue head on the stack.
 458
 459                           If the wq_head is on the stack, and we
 460                           leave because we got interrupted, then the
 461                           wq_head is no longer there when the
 462                           callback routine tries to wake us up.
 463                         */
 464                         ret = mtd->erase(mtd, erase);
 465                         if (!ret) {
 466                                 set_current_state(TASK_UNINTERRUPTIBLE);
 467                                 add_wait_queue(&waitq, &wait);
 468                                 if (erase->state != MTD_ERASE_DONE &&
 469                                     erase->state != MTD_ERASE_FAILED)
 470                                         schedule();
 471                                 remove_wait_queue(&waitq, &wait);
 472                                 set_current_state(TASK_RUNNING);
 473
 474                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 475                         }
 476                         kfree(erase);
 477                 }
 478                 break;
 479         }
 480
 481         case MEMWRITEOOB:
 482         {
 483                 struct mtd_oob_buf buf;
 484                 struct mtd_oob_ops ops;
 485
 486                 if(!(file->f_mode & 2))
 487                         return -EPERM;
 488
 489                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 490                         return -EFAULT;
 491
 492                 if (buf.length > 4096)
 493                         return -EINVAL;
 494
 495                 if (!mtd->write_oob)
 496                         ret = -EOPNOTSUPP;
 497                 else
 498                         ret = access_ok(VERIFY_READ, buf.ptr,
 499                                         buf.length) ? 0 : EFAULT;
 500
 501                 if (ret)
 502                         return ret;
 503
 504                 ops.ooblen = buf.length;
 505                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 506                 ops.datbuf = NULL;
 507                 ops.mode = MTD_OOB_PLACE;
 508
 509                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 510                         return -EINVAL;
 511
 512                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 513                 if (!ops.oobbuf)
 514                         return -ENOMEM;
 515
 516                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 517                         kfree(ops.oobbuf);
 518                         return -EFAULT;
 519                 }
 520
 521                 buf.start &= ~(mtd->oobsize - 1);
 522                 ret = mtd->write_oob(mtd, buf.start, &ops);
 523
 524                 if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen,
 525                                  sizeof(uint32_t)))
 526                         ret = -EFAULT;
 527
 528                 kfree(ops.oobbuf);
 529                 break;
 530
 531         }
 532
 533         case MEMREADOOB:
 534         {
 535                 struct mtd_oob_buf buf;
 536                 struct mtd_oob_ops ops;
 537
 538                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 539                         return -EFAULT;
 540
 541                 if (buf.length > 4096)
 542                         return -EINVAL;
 543
 544                 if (!mtd->read_oob)
 545                         ret = -EOPNOTSUPP;
 546                 else
 547                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 548                                         buf.length) ? 0 : -EFAULT;
 549                 if (ret)
 550                         return ret;
 551
 552                 ops.ooblen = buf.length;
 553                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 554                 ops.datbuf = NULL;
 555                 ops.mode = MTD_OOB_PLACE;
 556
 557                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 558                         return -EINVAL;
 559
 560                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 561                 if (!ops.oobbuf)
 562                         return -ENOMEM;
 563
 564                 buf.start &= ~(mtd->oobsize - 1);
 565                 ret = mtd->read_oob(mtd, buf.start, &ops);
 566
 567                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 568                         ret = -EFAULT;
 569                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 570                                                     ops.oobretlen))
 571                         ret = -EFAULT;
 572
 573                 kfree(ops.oobbuf);
 574                 break;
 575         }
 576
 577         case MEMLOCK:
 578         {
 579                 struct erase_info_user info;
 580
 581                 if (copy_from_user(&info, argp, sizeof(info)))
 582                         return -EFAULT;
 583
 584                 if (!mtd->lock)
 585                         ret = -EOPNOTSUPP;
 586                 else
 587                         ret = mtd->lock(mtd, info.start, info.length);
 588                 break;
 589         }
 590
 591         case MEMUNLOCK:
 592         {
 593                 struct erase_info_user info;
 594
 595                 if (copy_from_user(&info, argp, sizeof(info)))
 596                         return -EFAULT;
 597
 598                 if (!mtd->unlock)
 599                         ret = -EOPNOTSUPP;
 600                 else
 601                         ret = mtd->unlock(mtd, info.start, info.length);
 602                 break;
 603         }
 604
 605         /* Legacy interface */
 606         case MEMGETOOBSEL:
 607         {
 608                 struct nand_oobinfo oi;
 609
 610                 if (!mtd->ecclayout)
 611                         return -EOPNOTSUPP;
 612                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 613                         return -EINVAL;
 614
 615                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 616                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 617                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 618                        sizeof(oi.oobfree));
 619                 oi.eccbytes = mtd->ecclayout->eccbytes;
 620
 621                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 622                         return -EFAULT;
 623                 break;
 624         }
 625
 626         case MEMGETBADBLOCK:
 627         {
 628                 loff_t offs;
 629
 630                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 631                         return -EFAULT;
 632                 if (!mtd->block_isbad)
 633                         ret = -EOPNOTSUPP;
 634                 else
 635                         return mtd->block_isbad(mtd, offs);
 636                 break;
 637         }
 638
 639         case MEMSETBADBLOCK:
 640         {
 641                 loff_t offs;
 642
 643                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 644                         return -EFAULT;
 645                 if (!mtd->block_markbad)
 646                         ret = -EOPNOTSUPP;
 647                 else
 648                         return mtd->block_markbad(mtd, offs);
 649                 break;
 650         }
 651
 652 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 653         case OTPSELECT:
 654         {
 655                 int mode;
 656                 if (copy_from_user(&mode, argp, sizeof(int)))
 657                         return -EFAULT;
 658
 659                 mfi->mode = MTD_MODE_NORMAL;
 660
 661                 ret = otp_select_filemode(mfi, mode);
 662
 663                 file->f_pos = 0;
 664                 break;
 665         }
 666
 667         case OTPGETREGIONCOUNT:
 668         case OTPGETREGIONINFO:
 669         {
 670                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 671                 if (!buf)
 672                         return -ENOMEM;
 673                 ret = -EOPNOTSUPP;
 674                 switch (mfi->mode) {
 675                 case MTD_MODE_OTP_FACTORY:
 676                         if (mtd->get_fact_prot_info)
 677                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 678                         break;
 679                 case MTD_MODE_OTP_USER:
 680                         if (mtd->get_user_prot_info)
 681                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 682                         break;
 683                 default:
 684                         break;
 685                 }
 686                 if (ret >= 0) {
 687                         if (cmd == OTPGETREGIONCOUNT) {
 688                                 int nbr = ret / sizeof(struct otp_info);
 689                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 690                         } else
 691                                 ret = copy_to_user(argp, buf, ret);
 692                         if (ret)
 693                                 ret = -EFAULT;
 694                 }
 695                 kfree(buf);
 696                 break;
 697         }
 698
 699         case OTPLOCK:
 700         {
 701                 struct otp_info info;
 702
 703                 if (mfi->mode != MTD_MODE_OTP_USER)
 704                         return -EINVAL;
 705                 if (copy_from_user(&info, argp, sizeof(info)))
 706                         return -EFAULT;
 707                 if (!mtd->lock_user_prot_reg)
 708                         return -EOPNOTSUPP;
 709                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 710                 break;
 711         }
 712 #endif
 713
 714         case ECCGETLAYOUT:
 715         {
 716                 if (!mtd->ecclayout)
 717                         return -EOPNOTSUPP;
 718
 719                 if (copy_to_user(argp, mtd->ecclayout,
 720                                  sizeof(struct nand_ecclayout)))
 721                         return -EFAULT;
 722                 break;
 723         }
 724
 725         case ECCGETSTATS:
 726         {
 727                 if (copy_to_user(argp, &mtd->ecc_stats,
 728                                  sizeof(struct mtd_ecc_stats)))
 729                         return -EFAULT;
 730                 break;
 731         }
 732
 733         case MTDFILEMODE:
 734         {
 735                 mfi->mode = 0;
 736
 737                 switch(arg) {
 738                 case MTD_MODE_OTP_FACTORY:
 739                 case MTD_MODE_OTP_USER:
 740                         ret = otp_select_filemode(mfi, arg);
 741                         break;
 742
 743                 case MTD_MODE_RAW:
 744                         if (!mtd->read_oob || !mtd->write_oob)
 745                                 return -EOPNOTSUPP;
 746                         mfi->mode = arg;
 747
 748                 case MTD_MODE_NORMAL:
 749                         break;
 750                 default:
 751                         ret = -EINVAL;
 752                 }
 753                 file->f_pos = 0;
 754                 break;
 755         }
 756
 757         default:
 758                 ret = -ENOTTY;
 759         }
 760
 761         return ret;
 762 } /* memory_ioctl */
 763
 764 static const struct file_operations mtd_fops = {
 765         .owner          = THIS_MODULE,
 766         .llseek         = mtd_lseek,
 767         .read           = mtd_read,
 768         .write          = mtd_write,
 769         .ioctl          = mtd_ioctl,
 770         .open           = mtd_open,
 771         .release        = mtd_close,
 772 };
 773
 774 static int __init init_mtdchar(void)
 775 {
 776         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 777                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 778                        MTD_CHAR_MAJOR);
 779                 return -EAGAIN;
 780         }
 781
 782         mtd_class = class_create(THIS_MODULE, "mtd");
 783
 784         if (IS_ERR(mtd_class)) {
 785                 printk(KERN_ERR "Error creating mtd class.\n");
 786                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 787                 return PTR_ERR(mtd_class);
 788         }
 789
 790         register_mtd_user(&notifier);
 791         return 0;
 792 }
 793
 794 static void __exit cleanup_mtdchar(void)
 795 {
 796         unregister_mtd_user(&notifier);
 797         class_destroy(mtd_class);
 798         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 799 }
 800
 801 module_init(init_mtdchar);
 802 module_exit(cleanup_mtdchar);
 803
 804
 805 MODULE_LICENSE("GPL");
 806 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 807 MODULE_DESCRIPTION("Direct character-device access to MTD devices");