git.oblomov.eu Git - linux-2.6/blob - 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_drvdata(mtd_class, NULL,
  32                               MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  33                               NULL, "mtd%d", mtd->index);
  34
  35         device_create_drvdata(mtd_class, NULL,
  36                               MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
  37                               NULL, "mtd%dro", mtd->index);
  38 }
  39
  40 static void mtd_notify_remove(struct mtd_info* mtd)
  41 {
  42         if (!mtd)
  43                 return;
  44
  45         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  46         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  47 }
  48
  49 static struct mtd_notifier notifier = {
  50         .add    = mtd_notify_add,
  51         .remove = mtd_notify_remove,
  52 };
  53
  54 /*
  55  * Data structure to hold the pointer to the mtd device as well
  56  * as mode information ofr various use cases.
  57  */
  58 struct mtd_file_info {
  59         struct mtd_info *mtd;
  60         enum mtd_file_modes mode;
  61 };
  62
  63 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  64 {
  65         struct mtd_file_info *mfi = file->private_data;
  66         struct mtd_info *mtd = mfi->mtd;
  67
  68         switch (orig) {
  69         case SEEK_SET:
  70                 break;
  71         case SEEK_CUR:
  72                 offset += file->f_pos;
  73                 break;
  74         case SEEK_END:
  75                 offset += mtd->size;
  76                 break;
  77         default:
  78                 return -EINVAL;
  79         }
  80
  81         if (offset >= 0 && offset <= mtd->size)
  82                 return file->f_pos = offset;
  83
  84         return -EINVAL;
  85 }
  86
  87
  88
  89 static int mtd_open(struct inode *inode, struct file *file)
  90 {
  91         int minor = iminor(inode);
  92         int devnum = minor >> 1;
  93         int ret = 0;
  94         struct mtd_info *mtd;
  95         struct mtd_file_info *mfi;
  96
  97         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  98
  99         if (devnum >= MAX_MTD_DEVICES)
 100                 return -ENODEV;
 101
 102         /* You can't open the RO devices RW */
 103         if ((file->f_mode & 2) && (minor & 1))
 104                 return -EACCES;
 105
 106         lock_kernel();
 107         mtd = get_mtd_device(NULL, devnum);
 108
 109         if (IS_ERR(mtd)) {
 110                 ret = PTR_ERR(mtd);
 111                 goto out;
 112         }
 113
 114         if (MTD_ABSENT == mtd->type) {
 115                 put_mtd_device(mtd);
 116                 ret = -ENODEV;
 117                 goto out;
 118         }
 119
 120         /* You can't open it RW if it's not a writeable device */
 121         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 122                 put_mtd_device(mtd);
 123                 ret = -EACCES;
 124                 goto out;
 125         }
 126
 127         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 128         if (!mfi) {
 129                 put_mtd_device(mtd);
 130                 ret = -ENOMEM;
 131                 goto out;
 132         }
 133         mfi->mtd = mtd;
 134         file->private_data = mfi;
 135
 136 out:
 137         unlock_kernel();
 138         return ret;
 139 } /* mtd_open */
 140
 141 /*====================================================================*/
 142
 143 static int mtd_close(struct inode *inode, struct file *file)
 144 {
 145         struct mtd_file_info *mfi = file->private_data;
 146         struct mtd_info *mtd = mfi->mtd;
 147
 148         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 149
 150         /* Only sync if opened RW */
 151         if ((file->f_mode & 2) && mtd->sync)
 152                 mtd->sync(mtd);
 153
 154         put_mtd_device(mtd);
 155         file->private_data = NULL;
 156         kfree(mfi);
 157
 158         return 0;
 159 } /* mtd_close */
 160
 161 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 162    userspace buffer down and use it directly with readv/writev.
 163 */
 164 #define MAX_KMALLOC_SIZE 0x20000
 165
 166 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 167 {
 168         struct mtd_file_info *mfi = file->private_data;
 169         struct mtd_info *mtd = mfi->mtd;
 170         size_t retlen=0;
 171         size_t total_retlen=0;
 172         int ret=0;
 173         int len;
 174         char *kbuf;
 175
 176         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 177
 178         if (*ppos + count > mtd->size)
 179                 count = mtd->size - *ppos;
 180
 181         if (!count)
 182                 return 0;
 183
 184         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 185            and pass them directly to the MTD functions */
 186
 187         if (count > MAX_KMALLOC_SIZE)
 188                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 189         else
 190                 kbuf=kmalloc(count, GFP_KERNEL);
 191
 192         if (!kbuf)
 193                 return -ENOMEM;
 194
 195         while (count) {
 196
 197                 if (count > MAX_KMALLOC_SIZE)
 198                         len = MAX_KMALLOC_SIZE;
 199                 else
 200                         len = count;
 201
 202                 switch (mfi->mode) {
 203                 case MTD_MODE_OTP_FACTORY:
 204                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 205                         break;
 206                 case MTD_MODE_OTP_USER:
 207                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 208                         break;
 209                 case MTD_MODE_RAW:
 210                 {
 211                         struct mtd_oob_ops ops;
 212
 213                         ops.mode = MTD_OOB_RAW;
 214                         ops.datbuf = kbuf;
 215                         ops.oobbuf = NULL;
 216                         ops.len = len;
 217
 218                         ret = mtd->read_oob(mtd, *ppos, &ops);
 219                         retlen = ops.retlen;
 220                         break;
 221                 }
 222                 default:
 223                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 224                 }
 225                 /* Nand returns -EBADMSG on ecc errors, but it returns
 226                  * the data. For our userspace tools it is important
 227                  * to dump areas with ecc errors !
 228                  * For kernel internal usage it also might return -EUCLEAN
 229                  * to signal the caller that a bitflip has occured and has
 230                  * been corrected by the ECC algorithm.
 231                  * Userspace software which accesses NAND this way
 232                  * must be aware of the fact that it deals with NAND
 233                  */
 234                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 235                         *ppos += retlen;
 236                         if (copy_to_user(buf, kbuf, retlen)) {
 237                                 kfree(kbuf);
 238                                 return -EFAULT;
 239                         }
 240                         else
 241                                 total_retlen += retlen;
 242
 243                         count -= retlen;
 244                         buf += retlen;
 245                         if (retlen == 0)
 246                                 count = 0;
 247                 }
 248                 else {
 249                         kfree(kbuf);
 250                         return ret;
 251                 }
 252
 253         }
 254
 255         kfree(kbuf);
 256         return total_retlen;
 257 } /* mtd_read */
 258
 259 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 260 {
 261         struct mtd_file_info *mfi = file->private_data;
 262         struct mtd_info *mtd = mfi->mtd;
 263         char *kbuf;
 264         size_t retlen;
 265         size_t total_retlen=0;
 266         int ret=0;
 267         int len;
 268
 269         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 270
 271         if (*ppos == mtd->size)
 272                 return -ENOSPC;
 273
 274         if (*ppos + count > mtd->size)
 275                 count = mtd->size - *ppos;
 276
 277         if (!count)
 278                 return 0;
 279
 280         if (count > MAX_KMALLOC_SIZE)
 281                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 282         else
 283                 kbuf=kmalloc(count, GFP_KERNEL);
 284
 285         if (!kbuf)
 286                 return -ENOMEM;
 287
 288         while (count) {
 289
 290                 if (count > MAX_KMALLOC_SIZE)
 291                         len = MAX_KMALLOC_SIZE;
 292                 else
 293                         len = count;
 294
 295                 if (copy_from_user(kbuf, buf, len)) {
 296                         kfree(kbuf);
 297                         return -EFAULT;
 298                 }
 299
 300                 switch (mfi->mode) {
 301                 case MTD_MODE_OTP_FACTORY:
 302                         ret = -EROFS;
 303                         break;
 304                 case MTD_MODE_OTP_USER:
 305                         if (!mtd->write_user_prot_reg) {
 306                                 ret = -EOPNOTSUPP;
 307                                 break;
 308                         }
 309                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 310                         break;
 311
 312                 case MTD_MODE_RAW:
 313                 {
 314                         struct mtd_oob_ops ops;
 315
 316                         ops.mode = MTD_OOB_RAW;
 317                         ops.datbuf = kbuf;
 318                         ops.oobbuf = NULL;
 319                         ops.len = len;
 320
 321                         ret = mtd->write_oob(mtd, *ppos, &ops);
 322                         retlen = ops.retlen;
 323                         break;
 324                 }
 325
 326                 default:
 327                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 328                 }
 329                 if (!ret) {
 330                         *ppos += retlen;
 331                         total_retlen += retlen;
 332                         count -= retlen;
 333                         buf += retlen;
 334                 }
 335                 else {
 336                         kfree(kbuf);
 337                         return ret;
 338                 }
 339         }
 340
 341         kfree(kbuf);
 342         return total_retlen;
 343 } /* mtd_write */
 344
 345 /*======================================================================
 346
 347     IOCTL calls for getting device parameters.
 348
 349 ======================================================================*/
 350 static void mtdchar_erase_callback (struct erase_info *instr)
 351 {
 352         wake_up((wait_queue_head_t *)instr->priv);
 353 }
 354
 355 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 356 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 357 {
 358         struct mtd_info *mtd = mfi->mtd;
 359         int ret = 0;
 360
 361         switch (mode) {
 362         case MTD_OTP_FACTORY:
 363                 if (!mtd->read_fact_prot_reg)
 364                         ret = -EOPNOTSUPP;
 365                 else
 366                         mfi->mode = MTD_MODE_OTP_FACTORY;
 367                 break;
 368         case MTD_OTP_USER:
 369                 if (!mtd->read_fact_prot_reg)
 370                         ret = -EOPNOTSUPP;
 371                 else
 372                         mfi->mode = MTD_MODE_OTP_USER;
 373                 break;
 374         default:
 375                 ret = -EINVAL;
 376         case MTD_OTP_OFF:
 377                 break;
 378         }
 379         return ret;
 380 }
 381 #else
 382 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 383 #endif
 384
 385 static int mtd_ioctl(struct inode *inode, struct file *file,
 386                      u_int cmd, u_long arg)
 387 {
 388         struct mtd_file_info *mfi = file->private_data;
 389         struct mtd_info *mtd = mfi->mtd;
 390         void __user *argp = (void __user *)arg;
 391         int ret = 0;
 392         u_long size;
 393         struct mtd_info_user info;
 394
 395         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 396
 397         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 398         if (cmd & IOC_IN) {
 399                 if (!access_ok(VERIFY_READ, argp, size))
 400                         return -EFAULT;
 401         }
 402         if (cmd & IOC_OUT) {
 403                 if (!access_ok(VERIFY_WRITE, argp, size))
 404                         return -EFAULT;
 405         }
 406
 407         switch (cmd) {
 408         case MEMGETREGIONCOUNT:
 409                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 410                         return -EFAULT;
 411                 break;
 412
 413         case MEMGETREGIONINFO:
 414         {
 415                 struct region_info_user ur;
 416
 417                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 418                         return -EFAULT;
 419
 420                 if (ur.regionindex >= mtd->numeraseregions)
 421                         return -EINVAL;
 422                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 423                                 sizeof(struct mtd_erase_region_info)))
 424                         return -EFAULT;
 425                 break;
 426         }
 427
 428         case MEMGETINFO:
 429                 info.type       = mtd->type;
 430                 info.flags      = mtd->flags;
 431                 info.size       = mtd->size;
 432                 info.erasesize  = mtd->erasesize;
 433                 info.writesize  = mtd->writesize;
 434                 info.oobsize    = mtd->oobsize;
 435                 /* The below fields are obsolete */
 436                 info.ecctype    = -1;
 437                 info.eccsize    = 0;
 438                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 439                         return -EFAULT;
 440                 break;
 441
 442         case MEMERASE:
 443         {
 444                 struct erase_info *erase;
 445
 446                 if(!(file->f_mode & 2))
 447                         return -EPERM;
 448
 449                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 450                 if (!erase)
 451                         ret = -ENOMEM;
 452                 else {
 453                         wait_queue_head_t waitq;
 454                         DECLARE_WAITQUEUE(wait, current);
 455
 456                         init_waitqueue_head(&waitq);
 457
 458                         if (copy_from_user(&erase->addr, argp,
 459                                     sizeof(struct erase_info_user))) {
 460                                 kfree(erase);
 461                                 return -EFAULT;
 462                         }
 463                         erase->mtd = mtd;
 464                         erase->callback = mtdchar_erase_callback;
 465                         erase->priv = (unsigned long)&waitq;
 466
 467                         /*
 468                           FIXME: Allow INTERRUPTIBLE. Which means
 469                           not having the wait_queue head on the stack.
 470
 471                           If the wq_head is on the stack, and we
 472                           leave because we got interrupted, then the
 473                           wq_head is no longer there when the
 474                           callback routine tries to wake us up.
 475                         */
 476                         ret = mtd->erase(mtd, erase);
 477                         if (!ret) {
 478                                 set_current_state(TASK_UNINTERRUPTIBLE);
 479                                 add_wait_queue(&waitq, &wait);
 480                                 if (erase->state != MTD_ERASE_DONE &&
 481                                     erase->state != MTD_ERASE_FAILED)
 482                                         schedule();
 483                                 remove_wait_queue(&waitq, &wait);
 484                                 set_current_state(TASK_RUNNING);
 485
 486                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 487                         }
 488                         kfree(erase);
 489                 }
 490                 break;
 491         }
 492
 493         case MEMWRITEOOB:
 494         {
 495                 struct mtd_oob_buf buf;
 496                 struct mtd_oob_ops ops;
 497                 uint32_t retlen;
 498
 499                 if(!(file->f_mode & 2))
 500                         return -EPERM;
 501
 502                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 503                         return -EFAULT;
 504
 505                 if (buf.length > 4096)
 506                         return -EINVAL;
 507
 508                 if (!mtd->write_oob)
 509                         ret = -EOPNOTSUPP;
 510                 else
 511                         ret = access_ok(VERIFY_READ, buf.ptr,
 512                                         buf.length) ? 0 : EFAULT;
 513
 514                 if (ret)
 515                         return ret;
 516
 517                 ops.ooblen = buf.length;
 518                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 519                 ops.datbuf = NULL;
 520                 ops.mode = MTD_OOB_PLACE;
 521
 522                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 523                         return -EINVAL;
 524
 525                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 526                 if (!ops.oobbuf)
 527                         return -ENOMEM;
 528
 529                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 530                         kfree(ops.oobbuf);
 531                         return -EFAULT;
 532                 }
 533
 534                 buf.start &= ~(mtd->oobsize - 1);
 535                 ret = mtd->write_oob(mtd, buf.start, &ops);
 536
 537                 if (ops.oobretlen > 0xFFFFFFFFU)
 538                         ret = -EOVERFLOW;
 539                 retlen = ops.oobretlen;
 540                 if (copy_to_user(&((struct mtd_oob_buf *)argp)->length,
 541                                  &retlen, sizeof(buf.length)))
 542                         ret = -EFAULT;
 543
 544                 kfree(ops.oobbuf);
 545                 break;
 546
 547         }
 548
 549         case MEMREADOOB:
 550         {
 551                 struct mtd_oob_buf buf;
 552                 struct mtd_oob_ops ops;
 553
 554                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 555                         return -EFAULT;
 556
 557                 if (buf.length > 4096)
 558                         return -EINVAL;
 559
 560                 if (!mtd->read_oob)
 561                         ret = -EOPNOTSUPP;
 562                 else
 563                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 564                                         buf.length) ? 0 : -EFAULT;
 565                 if (ret)
 566                         return ret;
 567
 568                 ops.ooblen = buf.length;
 569                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 570                 ops.datbuf = NULL;
 571                 ops.mode = MTD_OOB_PLACE;
 572
 573                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 574                         return -EINVAL;
 575
 576                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 577                 if (!ops.oobbuf)
 578                         return -ENOMEM;
 579
 580                 buf.start &= ~(mtd->oobsize - 1);
 581                 ret = mtd->read_oob(mtd, buf.start, &ops);
 582
 583                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 584                         ret = -EFAULT;
 585                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 586                                                     ops.oobretlen))
 587                         ret = -EFAULT;
 588
 589                 kfree(ops.oobbuf);
 590                 break;
 591         }
 592
 593         case MEMLOCK:
 594         {
 595                 struct erase_info_user info;
 596
 597                 if (copy_from_user(&info, argp, sizeof(info)))
 598                         return -EFAULT;
 599
 600                 if (!mtd->lock)
 601                         ret = -EOPNOTSUPP;
 602                 else
 603                         ret = mtd->lock(mtd, info.start, info.length);
 604                 break;
 605         }
 606
 607         case MEMUNLOCK:
 608         {
 609                 struct erase_info_user info;
 610
 611                 if (copy_from_user(&info, argp, sizeof(info)))
 612                         return -EFAULT;
 613
 614                 if (!mtd->unlock)
 615                         ret = -EOPNOTSUPP;
 616                 else
 617                         ret = mtd->unlock(mtd, info.start, info.length);
 618                 break;
 619         }
 620
 621         /* Legacy interface */
 622         case MEMGETOOBSEL:
 623         {
 624                 struct nand_oobinfo oi;
 625
 626                 if (!mtd->ecclayout)
 627                         return -EOPNOTSUPP;
 628                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 629                         return -EINVAL;
 630
 631                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 632                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 633                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 634                        sizeof(oi.oobfree));
 635                 oi.eccbytes = mtd->ecclayout->eccbytes;
 636
 637                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 638                         return -EFAULT;
 639                 break;
 640         }
 641
 642         case MEMGETBADBLOCK:
 643         {
 644                 loff_t offs;
 645
 646                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 647                         return -EFAULT;
 648                 if (!mtd->block_isbad)
 649                         ret = -EOPNOTSUPP;
 650                 else
 651                         return mtd->block_isbad(mtd, offs);
 652                 break;
 653         }
 654
 655         case MEMSETBADBLOCK:
 656         {
 657                 loff_t offs;
 658
 659                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 660                         return -EFAULT;
 661                 if (!mtd->block_markbad)
 662                         ret = -EOPNOTSUPP;
 663                 else
 664                         return mtd->block_markbad(mtd, offs);
 665                 break;
 666         }
 667
 668 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 669         case OTPSELECT:
 670         {
 671                 int mode;
 672                 if (copy_from_user(&mode, argp, sizeof(int)))
 673                         return -EFAULT;
 674
 675                 mfi->mode = MTD_MODE_NORMAL;
 676
 677                 ret = otp_select_filemode(mfi, mode);
 678
 679                 file->f_pos = 0;
 680                 break;
 681         }
 682
 683         case OTPGETREGIONCOUNT:
 684         case OTPGETREGIONINFO:
 685         {
 686                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 687                 if (!buf)
 688                         return -ENOMEM;
 689                 ret = -EOPNOTSUPP;
 690                 switch (mfi->mode) {
 691                 case MTD_MODE_OTP_FACTORY:
 692                         if (mtd->get_fact_prot_info)
 693                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 694                         break;
 695                 case MTD_MODE_OTP_USER:
 696                         if (mtd->get_user_prot_info)
 697                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 698                         break;
 699                 default:
 700                         break;
 701                 }
 702                 if (ret >= 0) {
 703                         if (cmd == OTPGETREGIONCOUNT) {
 704                                 int nbr = ret / sizeof(struct otp_info);
 705                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 706                         } else
 707                                 ret = copy_to_user(argp, buf, ret);
 708                         if (ret)
 709                                 ret = -EFAULT;
 710                 }
 711                 kfree(buf);
 712                 break;
 713         }
 714
 715         case OTPLOCK:
 716         {
 717                 struct otp_info info;
 718
 719                 if (mfi->mode != MTD_MODE_OTP_USER)
 720                         return -EINVAL;
 721                 if (copy_from_user(&info, argp, sizeof(info)))
 722                         return -EFAULT;
 723                 if (!mtd->lock_user_prot_reg)
 724                         return -EOPNOTSUPP;
 725                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 726                 break;
 727         }
 728 #endif
 729
 730         case ECCGETLAYOUT:
 731         {
 732                 if (!mtd->ecclayout)
 733                         return -EOPNOTSUPP;
 734
 735                 if (copy_to_user(argp, mtd->ecclayout,
 736                                  sizeof(struct nand_ecclayout)))
 737                         return -EFAULT;
 738                 break;
 739         }
 740
 741         case ECCGETSTATS:
 742         {
 743                 if (copy_to_user(argp, &mtd->ecc_stats,
 744                                  sizeof(struct mtd_ecc_stats)))
 745                         return -EFAULT;
 746                 break;
 747         }
 748
 749         case MTDFILEMODE:
 750         {
 751                 mfi->mode = 0;
 752
 753                 switch(arg) {
 754                 case MTD_MODE_OTP_FACTORY:
 755                 case MTD_MODE_OTP_USER:
 756                         ret = otp_select_filemode(mfi, arg);
 757                         break;
 758
 759                 case MTD_MODE_RAW:
 760                         if (!mtd->read_oob || !mtd->write_oob)
 761                                 return -EOPNOTSUPP;
 762                         mfi->mode = arg;
 763
 764                 case MTD_MODE_NORMAL:
 765                         break;
 766                 default:
 767                         ret = -EINVAL;
 768                 }
 769                 file->f_pos = 0;
 770                 break;
 771         }
 772
 773         default:
 774                 ret = -ENOTTY;
 775         }
 776
 777         return ret;
 778 } /* memory_ioctl */
 779
 780 static const struct file_operations mtd_fops = {
 781         .owner          = THIS_MODULE,
 782         .llseek         = mtd_lseek,
 783         .read           = mtd_read,
 784         .write          = mtd_write,
 785         .ioctl          = mtd_ioctl,
 786         .open           = mtd_open,
 787         .release        = mtd_close,
 788 };
 789
 790 static int __init init_mtdchar(void)
 791 {
 792         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 793                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 794                        MTD_CHAR_MAJOR);
 795                 return -EAGAIN;
 796         }
 797
 798         mtd_class = class_create(THIS_MODULE, "mtd");
 799
 800         if (IS_ERR(mtd_class)) {
 801                 printk(KERN_ERR "Error creating mtd class.\n");
 802                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 803                 return PTR_ERR(mtd_class);
 804         }
 805
 806         register_mtd_user(&notifier);
 807         return 0;
 808 }
 809
 810 static void __exit cleanup_mtdchar(void)
 811 {
 812         unregister_mtd_user(&notifier);
 813         class_destroy(mtd_class);
 814         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 815 }
 816
 817 module_init(init_mtdchar);
 818 module_exit(cleanup_mtdchar);
 819
 820
 821 MODULE_LICENSE("GPL");
 822 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 823 MODULE_DESCRIPTION("Direct character-device access to MTD devices");