git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/mtdchar.c

   1 /*
   2  * Character-device access to raw MTD devices.
   3  *
   4  */
   5
   6 #include <linux/device.h>
   7 #include <linux/fs.h>
   8 #include <linux/mm.h>
   9 #include <linux/err.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 #include <linux/smp_lock.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         device_create_drvdata(mtd_class, NULL,
  30                               MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  31                               NULL, "mtd%d", mtd->index);
  32
  33         device_create_drvdata(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         device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  44         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         int ret = 0;
  92         struct mtd_info *mtd;
  93         struct mtd_file_info *mfi;
  94
  95         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  96
  97         if (devnum >= MAX_MTD_DEVICES)
  98                 return -ENODEV;
  99
 100         /* You can't open the RO devices RW */
 101         if ((file->f_mode & 2) && (minor & 1))
 102                 return -EACCES;
 103
 104         lock_kernel();
 105         mtd = get_mtd_device(NULL, devnum);
 106
 107         if (IS_ERR(mtd)) {
 108                 ret = PTR_ERR(mtd);
 109                 goto out;
 110         }
 111
 112         if (MTD_ABSENT == mtd->type) {
 113                 put_mtd_device(mtd);
 114                 ret = -ENODEV;
 115                 goto out;
 116         }
 117
 118         /* You can't open it RW if it's not a writeable device */
 119         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 120                 put_mtd_device(mtd);
 121                 ret = -EACCES;
 122                 goto out;
 123         }
 124
 125         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 126         if (!mfi) {
 127                 put_mtd_device(mtd);
 128                 ret = -ENOMEM;
 129                 goto out;
 130         }
 131         mfi->mtd = mtd;
 132         file->private_data = mfi;
 133
 134 out:
 135         unlock_kernel();
 136         return ret;
 137 } /* mtd_open */
 138
 139 /*====================================================================*/
 140
 141 static int mtd_close(struct inode *inode, struct file *file)
 142 {
 143         struct mtd_file_info *mfi = file->private_data;
 144         struct mtd_info *mtd = mfi->mtd;
 145
 146         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 147
 148         /* Only sync if opened RW */
 149         if ((file->f_mode & 2) && mtd->sync)
 150                 mtd->sync(mtd);
 151
 152         put_mtd_device(mtd);
 153         file->private_data = NULL;
 154         kfree(mfi);
 155
 156         return 0;
 157 } /* mtd_close */
 158
 159 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 160    userspace buffer down and use it directly with readv/writev.
 161 */
 162 #define MAX_KMALLOC_SIZE 0x20000
 163
 164 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 165 {
 166         struct mtd_file_info *mfi = file->private_data;
 167         struct mtd_info *mtd = mfi->mtd;
 168         size_t retlen=0;
 169         size_t total_retlen=0;
 170         int ret=0;
 171         int len;
 172         char *kbuf;
 173
 174         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 175
 176         if (*ppos + count > mtd->size)
 177                 count = mtd->size - *ppos;
 178
 179         if (!count)
 180                 return 0;
 181
 182         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 183            and pass them directly to the MTD functions */
 184
 185         if (count > MAX_KMALLOC_SIZE)
 186                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 187         else
 188                 kbuf=kmalloc(count, GFP_KERNEL);
 189
 190         if (!kbuf)
 191                 return -ENOMEM;
 192
 193         while (count) {
 194
 195                 if (count > MAX_KMALLOC_SIZE)
 196                         len = MAX_KMALLOC_SIZE;
 197                 else
 198                         len = count;
 199
 200                 switch (mfi->mode) {
 201                 case MTD_MODE_OTP_FACTORY:
 202                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 203                         break;
 204                 case MTD_MODE_OTP_USER:
 205                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 206                         break;
 207                 case MTD_MODE_RAW:
 208                 {
 209                         struct mtd_oob_ops ops;
 210
 211                         ops.mode = MTD_OOB_RAW;
 212                         ops.datbuf = kbuf;
 213                         ops.oobbuf = NULL;
 214                         ops.len = len;
 215
 216                         ret = mtd->read_oob(mtd, *ppos, &ops);
 217                         retlen = ops.retlen;
 218                         break;
 219                 }
 220                 default:
 221                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 222                 }
 223                 /* Nand returns -EBADMSG on ecc errors, but it returns
 224                  * the data. For our userspace tools it is important
 225                  * to dump areas with ecc errors !
 226                  * For kernel internal usage it also might return -EUCLEAN
 227                  * to signal the caller that a bitflip has occured and has
 228                  * been corrected by the ECC algorithm.
 229                  * Userspace software which accesses NAND this way
 230                  * must be aware of the fact that it deals with NAND
 231                  */
 232                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 233                         *ppos += retlen;
 234                         if (copy_to_user(buf, kbuf, retlen)) {
 235                                 kfree(kbuf);
 236                                 return -EFAULT;
 237                         }
 238                         else
 239                                 total_retlen += retlen;
 240
 241                         count -= retlen;
 242                         buf += retlen;
 243                         if (retlen == 0)
 244                                 count = 0;
 245                 }
 246                 else {
 247                         kfree(kbuf);
 248                         return ret;
 249                 }
 250
 251         }
 252
 253         kfree(kbuf);
 254         return total_retlen;
 255 } /* mtd_read */
 256
 257 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 258 {
 259         struct mtd_file_info *mfi = file->private_data;
 260         struct mtd_info *mtd = mfi->mtd;
 261         char *kbuf;
 262         size_t retlen;
 263         size_t total_retlen=0;
 264         int ret=0;
 265         int len;
 266
 267         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 268
 269         if (*ppos == mtd->size)
 270                 return -ENOSPC;
 271
 272         if (*ppos + count > mtd->size)
 273                 count = mtd->size - *ppos;
 274
 275         if (!count)
 276                 return 0;
 277
 278         if (count > MAX_KMALLOC_SIZE)
 279                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 280         else
 281                 kbuf=kmalloc(count, GFP_KERNEL);
 282
 283         if (!kbuf)
 284                 return -ENOMEM;
 285
 286         while (count) {
 287
 288                 if (count > MAX_KMALLOC_SIZE)
 289                         len = MAX_KMALLOC_SIZE;
 290                 else
 291                         len = count;
 292
 293                 if (copy_from_user(kbuf, buf, len)) {
 294                         kfree(kbuf);
 295                         return -EFAULT;
 296                 }
 297
 298                 switch (mfi->mode) {
 299                 case MTD_MODE_OTP_FACTORY:
 300                         ret = -EROFS;
 301                         break;
 302                 case MTD_MODE_OTP_USER:
 303                         if (!mtd->write_user_prot_reg) {
 304                                 ret = -EOPNOTSUPP;
 305                                 break;
 306                         }
 307                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 308                         break;
 309
 310                 case MTD_MODE_RAW:
 311                 {
 312                         struct mtd_oob_ops ops;
 313
 314                         ops.mode = MTD_OOB_RAW;
 315                         ops.datbuf = kbuf;
 316                         ops.oobbuf = NULL;
 317                         ops.len = len;
 318
 319                         ret = mtd->write_oob(mtd, *ppos, &ops);
 320                         retlen = ops.retlen;
 321                         break;
 322                 }
 323
 324                 default:
 325                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 326                 }
 327                 if (!ret) {
 328                         *ppos += retlen;
 329                         total_retlen += retlen;
 330                         count -= retlen;
 331                         buf += retlen;
 332                 }
 333                 else {
 334                         kfree(kbuf);
 335                         return ret;
 336                 }
 337         }
 338
 339         kfree(kbuf);
 340         return total_retlen;
 341 } /* mtd_write */
 342
 343 /*======================================================================
 344
 345     IOCTL calls for getting device parameters.
 346
 347 ======================================================================*/
 348 static void mtdchar_erase_callback (struct erase_info *instr)
 349 {
 350         wake_up((wait_queue_head_t *)instr->priv);
 351 }
 352
 353 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 354 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 355 {
 356         struct mtd_info *mtd = mfi->mtd;
 357         int ret = 0;
 358
 359         switch (mode) {
 360         case MTD_OTP_FACTORY:
 361                 if (!mtd->read_fact_prot_reg)
 362                         ret = -EOPNOTSUPP;
 363                 else
 364                         mfi->mode = MTD_MODE_OTP_FACTORY;
 365                 break;
 366         case MTD_OTP_USER:
 367                 if (!mtd->read_fact_prot_reg)
 368                         ret = -EOPNOTSUPP;
 369                 else
 370                         mfi->mode = MTD_MODE_OTP_USER;
 371                 break;
 372         default:
 373                 ret = -EINVAL;
 374         case MTD_OTP_OFF:
 375                 break;
 376         }
 377         return ret;
 378 }
 379 #else
 380 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 381 #endif
 382
 383 static int mtd_ioctl(struct inode *inode, struct file *file,
 384                      u_int cmd, u_long arg)
 385 {
 386         struct mtd_file_info *mfi = file->private_data;
 387         struct mtd_info *mtd = mfi->mtd;
 388         void __user *argp = (void __user *)arg;
 389         int ret = 0;
 390         u_long size;
 391         struct mtd_info_user info;
 392
 393         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 394
 395         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 396         if (cmd & IOC_IN) {
 397                 if (!access_ok(VERIFY_READ, argp, size))
 398                         return -EFAULT;
 399         }
 400         if (cmd & IOC_OUT) {
 401                 if (!access_ok(VERIFY_WRITE, argp, size))
 402                         return -EFAULT;
 403         }
 404
 405         switch (cmd) {
 406         case MEMGETREGIONCOUNT:
 407                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 408                         return -EFAULT;
 409                 break;
 410
 411         case MEMGETREGIONINFO:
 412         {
 413                 uint32_t ur_idx;
 414                 struct mtd_erase_region_info *kr;
 415                 struct region_info_user *ur = (struct region_info_user *) argp;
 416
 417                 if (get_user(ur_idx, &(ur->regionindex)))
 418                         return -EFAULT;
 419
 420                 kr = &(mtd->eraseregions[ur_idx]);
 421
 422                 if (put_user(kr->offset, &(ur->offset))
 423                     || put_user(kr->erasesize, &(ur->erasesize))
 424                     || put_user(kr->numblocks, &(ur->numblocks)))
 425                         return -EFAULT;
 426
 427                 break;
 428         }
 429
 430         case MEMGETINFO:
 431                 info.type       = mtd->type;
 432                 info.flags      = mtd->flags;
 433                 info.size       = mtd->size;
 434                 info.erasesize  = mtd->erasesize;
 435                 info.writesize  = mtd->writesize;
 436                 info.oobsize    = mtd->oobsize;
 437                 /* The below fields are obsolete */
 438                 info.ecctype    = -1;
 439                 info.eccsize    = 0;
 440                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 441                         return -EFAULT;
 442                 break;
 443
 444         case MEMERASE:
 445         {
 446                 struct erase_info *erase;
 447
 448                 if(!(file->f_mode & 2))
 449                         return -EPERM;
 450
 451                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 452                 if (!erase)
 453                         ret = -ENOMEM;
 454                 else {
 455                         wait_queue_head_t waitq;
 456                         DECLARE_WAITQUEUE(wait, current);
 457
 458                         init_waitqueue_head(&waitq);
 459
 460                         if (copy_from_user(&erase->addr, argp,
 461                                     sizeof(struct erase_info_user))) {
 462                                 kfree(erase);
 463                                 return -EFAULT;
 464                         }
 465                         erase->mtd = mtd;
 466                         erase->callback = mtdchar_erase_callback;
 467                         erase->priv = (unsigned long)&waitq;
 468
 469                         /*
 470                           FIXME: Allow INTERRUPTIBLE. Which means
 471                           not having the wait_queue head on the stack.
 472
 473                           If the wq_head is on the stack, and we
 474                           leave because we got interrupted, then the
 475                           wq_head is no longer there when the
 476                           callback routine tries to wake us up.
 477                         */
 478                         ret = mtd->erase(mtd, erase);
 479                         if (!ret) {
 480                                 set_current_state(TASK_UNINTERRUPTIBLE);
 481                                 add_wait_queue(&waitq, &wait);
 482                                 if (erase->state != MTD_ERASE_DONE &&
 483                                     erase->state != MTD_ERASE_FAILED)
 484                                         schedule();
 485                                 remove_wait_queue(&waitq, &wait);
 486                                 set_current_state(TASK_RUNNING);
 487
 488                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 489                         }
 490                         kfree(erase);
 491                 }
 492                 break;
 493         }
 494
 495         case MEMWRITEOOB:
 496         {
 497                 struct mtd_oob_buf buf;
 498                 struct mtd_oob_ops ops;
 499                 struct mtd_oob_buf __user *user_buf = argp;
 500                 uint32_t retlen;
 501
 502                 if(!(file->f_mode & 2))
 503                         return -EPERM;
 504
 505                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 506                         return -EFAULT;
 507
 508                 if (buf.length > 4096)
 509                         return -EINVAL;
 510
 511                 if (!mtd->write_oob)
 512                         ret = -EOPNOTSUPP;
 513                 else
 514                         ret = access_ok(VERIFY_READ, buf.ptr,
 515                                         buf.length) ? 0 : EFAULT;
 516
 517                 if (ret)
 518                         return ret;
 519
 520                 ops.ooblen = buf.length;
 521                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 522                 ops.datbuf = NULL;
 523                 ops.mode = MTD_OOB_PLACE;
 524
 525                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 526                         return -EINVAL;
 527
 528                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 529                 if (!ops.oobbuf)
 530                         return -ENOMEM;
 531
 532                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 533                         kfree(ops.oobbuf);
 534                         return -EFAULT;
 535                 }
 536
 537                 buf.start &= ~(mtd->oobsize - 1);
 538                 ret = mtd->write_oob(mtd, buf.start, &ops);
 539
 540                 if (ops.oobretlen > 0xFFFFFFFFU)
 541                         ret = -EOVERFLOW;
 542                 retlen = ops.oobretlen;
 543                 if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
 544                         ret = -EFAULT;
 545
 546                 kfree(ops.oobbuf);
 547                 break;
 548
 549         }
 550
 551         case MEMREADOOB:
 552         {
 553                 struct mtd_oob_buf buf;
 554                 struct mtd_oob_ops ops;
 555
 556                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 557                         return -EFAULT;
 558
 559                 if (buf.length > 4096)
 560                         return -EINVAL;
 561
 562                 if (!mtd->read_oob)
 563                         ret = -EOPNOTSUPP;
 564                 else
 565                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 566                                         buf.length) ? 0 : -EFAULT;
 567                 if (ret)
 568                         return ret;
 569
 570                 ops.ooblen = buf.length;
 571                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 572                 ops.datbuf = NULL;
 573                 ops.mode = MTD_OOB_PLACE;
 574
 575                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 576                         return -EINVAL;
 577
 578                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 579                 if (!ops.oobbuf)
 580                         return -ENOMEM;
 581
 582                 buf.start &= ~(mtd->oobsize - 1);
 583                 ret = mtd->read_oob(mtd, buf.start, &ops);
 584
 585                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 586                         ret = -EFAULT;
 587                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 588                                                     ops.oobretlen))
 589                         ret = -EFAULT;
 590
 591                 kfree(ops.oobbuf);
 592                 break;
 593         }
 594
 595         case MEMLOCK:
 596         {
 597                 struct erase_info_user einfo;
 598
 599                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
 600                         return -EFAULT;
 601
 602                 if (!mtd->lock)
 603                         ret = -EOPNOTSUPP;
 604                 else
 605                         ret = mtd->lock(mtd, einfo.start, einfo.length);
 606                 break;
 607         }
 608
 609         case MEMUNLOCK:
 610         {
 611                 struct erase_info_user einfo;
 612
 613                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
 614                         return -EFAULT;
 615
 616                 if (!mtd->unlock)
 617                         ret = -EOPNOTSUPP;
 618                 else
 619                         ret = mtd->unlock(mtd, einfo.start, einfo.length);
 620                 break;
 621         }
 622
 623         /* Legacy interface */
 624         case MEMGETOOBSEL:
 625         {
 626                 struct nand_oobinfo oi;
 627
 628                 if (!mtd->ecclayout)
 629                         return -EOPNOTSUPP;
 630                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 631                         return -EINVAL;
 632
 633                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 634                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 635                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 636                        sizeof(oi.oobfree));
 637                 oi.eccbytes = mtd->ecclayout->eccbytes;
 638
 639                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 640                         return -EFAULT;
 641                 break;
 642         }
 643
 644         case MEMGETBADBLOCK:
 645         {
 646                 loff_t offs;
 647
 648                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 649                         return -EFAULT;
 650                 if (!mtd->block_isbad)
 651                         ret = -EOPNOTSUPP;
 652                 else
 653                         return mtd->block_isbad(mtd, offs);
 654                 break;
 655         }
 656
 657         case MEMSETBADBLOCK:
 658         {
 659                 loff_t offs;
 660
 661                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 662                         return -EFAULT;
 663                 if (!mtd->block_markbad)
 664                         ret = -EOPNOTSUPP;
 665                 else
 666                         return mtd->block_markbad(mtd, offs);
 667                 break;
 668         }
 669
 670 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 671         case OTPSELECT:
 672         {
 673                 int mode;
 674                 if (copy_from_user(&mode, argp, sizeof(int)))
 675                         return -EFAULT;
 676
 677                 mfi->mode = MTD_MODE_NORMAL;
 678
 679                 ret = otp_select_filemode(mfi, mode);
 680
 681                 file->f_pos = 0;
 682                 break;
 683         }
 684
 685         case OTPGETREGIONCOUNT:
 686         case OTPGETREGIONINFO:
 687         {
 688                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 689                 if (!buf)
 690                         return -ENOMEM;
 691                 ret = -EOPNOTSUPP;
 692                 switch (mfi->mode) {
 693                 case MTD_MODE_OTP_FACTORY:
 694                         if (mtd->get_fact_prot_info)
 695                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 696                         break;
 697                 case MTD_MODE_OTP_USER:
 698                         if (mtd->get_user_prot_info)
 699                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 700                         break;
 701                 default:
 702                         break;
 703                 }
 704                 if (ret >= 0) {
 705                         if (cmd == OTPGETREGIONCOUNT) {
 706                                 int nbr = ret / sizeof(struct otp_info);
 707                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 708                         } else
 709                                 ret = copy_to_user(argp, buf, ret);
 710                         if (ret)
 711                                 ret = -EFAULT;
 712                 }
 713                 kfree(buf);
 714                 break;
 715         }
 716
 717         case OTPLOCK:
 718         {
 719                 struct otp_info oinfo;
 720
 721                 if (mfi->mode != MTD_MODE_OTP_USER)
 722                         return -EINVAL;
 723                 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
 724                         return -EFAULT;
 725                 if (!mtd->lock_user_prot_reg)
 726                         return -EOPNOTSUPP;
 727                 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
 728                 break;
 729         }
 730 #endif
 731
 732         case ECCGETLAYOUT:
 733         {
 734                 if (!mtd->ecclayout)
 735                         return -EOPNOTSUPP;
 736
 737                 if (copy_to_user(argp, mtd->ecclayout,
 738                                  sizeof(struct nand_ecclayout)))
 739                         return -EFAULT;
 740                 break;
 741         }
 742
 743         case ECCGETSTATS:
 744         {
 745                 if (copy_to_user(argp, &mtd->ecc_stats,
 746                                  sizeof(struct mtd_ecc_stats)))
 747                         return -EFAULT;
 748                 break;
 749         }
 750
 751         case MTDFILEMODE:
 752         {
 753                 mfi->mode = 0;
 754
 755                 switch(arg) {
 756                 case MTD_MODE_OTP_FACTORY:
 757                 case MTD_MODE_OTP_USER:
 758                         ret = otp_select_filemode(mfi, arg);
 759                         break;
 760
 761                 case MTD_MODE_RAW:
 762                         if (!mtd->read_oob || !mtd->write_oob)
 763                                 return -EOPNOTSUPP;
 764                         mfi->mode = arg;
 765
 766                 case MTD_MODE_NORMAL:
 767                         break;
 768                 default:
 769                         ret = -EINVAL;
 770                 }
 771                 file->f_pos = 0;
 772                 break;
 773         }
 774
 775         default:
 776                 ret = -ENOTTY;
 777         }
 778
 779         return ret;
 780 } /* memory_ioctl */
 781
 782 static const struct file_operations mtd_fops = {
 783         .owner          = THIS_MODULE,
 784         .llseek         = mtd_lseek,
 785         .read           = mtd_read,
 786         .write          = mtd_write,
 787         .ioctl          = mtd_ioctl,
 788         .open           = mtd_open,
 789         .release        = mtd_close,
 790 };
 791
 792 static int __init init_mtdchar(void)
 793 {
 794         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 795                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 796                        MTD_CHAR_MAJOR);
 797                 return -EAGAIN;
 798         }
 799
 800         mtd_class = class_create(THIS_MODULE, "mtd");
 801
 802         if (IS_ERR(mtd_class)) {
 803                 printk(KERN_ERR "Error creating mtd class.\n");
 804                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 805                 return PTR_ERR(mtd_class);
 806         }
 807
 808         register_mtd_user(&notifier);
 809         return 0;
 810 }
 811
 812 static void __exit cleanup_mtdchar(void)
 813 {
 814         unregister_mtd_user(&notifier);
 815         class_destroy(mtd_class);
 816         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 817 }
 818
 819 module_init(init_mtdchar);
 820 module_exit(cleanup_mtdchar);
 821
 822
 823 MODULE_LICENSE("GPL");
 824 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 825 MODULE_DESCRIPTION("Direct character-device access to MTD devices");