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   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 #include <linux/backing-dev.h>
  17
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/compatmac.h>
  20
  21 #include <asm/uaccess.h>
  22
  23
  24 /*
  25  * Data structure to hold the pointer to the mtd device as well
  26  * as mode information ofr various use cases.
  27  */
  28 struct mtd_file_info {
  29         struct mtd_info *mtd;
  30         enum mtd_file_modes mode;
  31 };
  32
  33 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  34 {
  35         struct mtd_file_info *mfi = file->private_data;
  36         struct mtd_info *mtd = mfi->mtd;
  37
  38         switch (orig) {
  39         case SEEK_SET:
  40                 break;
  41         case SEEK_CUR:
  42                 offset += file->f_pos;
  43                 break;
  44         case SEEK_END:
  45                 offset += mtd->size;
  46                 break;
  47         default:
  48                 return -EINVAL;
  49         }
  50
  51         if (offset >= 0 && offset <= mtd->size)
  52                 return file->f_pos = offset;
  53
  54         return -EINVAL;
  55 }
  56
  57
  58
  59 static int mtd_open(struct inode *inode, struct file *file)
  60 {
  61         int minor = iminor(inode);
  62         int devnum = minor >> 1;
  63         int ret = 0;
  64         struct mtd_info *mtd;
  65         struct mtd_file_info *mfi;
  66
  67         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  68
  69         if (devnum >= MAX_MTD_DEVICES)
  70                 return -ENODEV;
  71
  72         /* You can't open the RO devices RW */
  73         if ((file->f_mode & FMODE_WRITE) && (minor & 1))
  74                 return -EACCES;
  75
  76         lock_kernel();
  77         mtd = get_mtd_device(NULL, devnum);
  78
  79         if (IS_ERR(mtd)) {
  80                 ret = PTR_ERR(mtd);
  81                 goto out;
  82         }
  83
  84         if (mtd->type == MTD_ABSENT) {
  85                 put_mtd_device(mtd);
  86                 ret = -ENODEV;
  87                 goto out;
  88         }
  89
  90         if (mtd->backing_dev_info)
  91                 file->f_mapping->backing_dev_info = mtd->backing_dev_info;
  92
  93         /* You can't open it RW if it's not a writeable device */
  94         if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
  95                 put_mtd_device(mtd);
  96                 ret = -EACCES;
  97                 goto out;
  98         }
  99
 100         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 101         if (!mfi) {
 102                 put_mtd_device(mtd);
 103                 ret = -ENOMEM;
 104                 goto out;
 105         }
 106         mfi->mtd = mtd;
 107         file->private_data = mfi;
 108
 109 out:
 110         unlock_kernel();
 111         return ret;
 112 } /* mtd_open */
 113
 114 /*====================================================================*/
 115
 116 static int mtd_close(struct inode *inode, struct file *file)
 117 {
 118         struct mtd_file_info *mfi = file->private_data;
 119         struct mtd_info *mtd = mfi->mtd;
 120
 121         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 122
 123         /* Only sync if opened RW */
 124         if ((file->f_mode & FMODE_WRITE) && mtd->sync)
 125                 mtd->sync(mtd);
 126
 127         put_mtd_device(mtd);
 128         file->private_data = NULL;
 129         kfree(mfi);
 130
 131         return 0;
 132 } /* mtd_close */
 133
 134 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 135    userspace buffer down and use it directly with readv/writev.
 136 */
 137 #define MAX_KMALLOC_SIZE 0x20000
 138
 139 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 140 {
 141         struct mtd_file_info *mfi = file->private_data;
 142         struct mtd_info *mtd = mfi->mtd;
 143         size_t retlen=0;
 144         size_t total_retlen=0;
 145         int ret=0;
 146         int len;
 147         char *kbuf;
 148
 149         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 150
 151         if (*ppos + count > mtd->size)
 152                 count = mtd->size - *ppos;
 153
 154         if (!count)
 155                 return 0;
 156
 157         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 158            and pass them directly to the MTD functions */
 159
 160         if (count > MAX_KMALLOC_SIZE)
 161                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 162         else
 163                 kbuf=kmalloc(count, GFP_KERNEL);
 164
 165         if (!kbuf)
 166                 return -ENOMEM;
 167
 168         while (count) {
 169
 170                 if (count > MAX_KMALLOC_SIZE)
 171                         len = MAX_KMALLOC_SIZE;
 172                 else
 173                         len = count;
 174
 175                 switch (mfi->mode) {
 176                 case MTD_MODE_OTP_FACTORY:
 177                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 178                         break;
 179                 case MTD_MODE_OTP_USER:
 180                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 181                         break;
 182                 case MTD_MODE_RAW:
 183                 {
 184                         struct mtd_oob_ops ops;
 185
 186                         ops.mode = MTD_OOB_RAW;
 187                         ops.datbuf = kbuf;
 188                         ops.oobbuf = NULL;
 189                         ops.len = len;
 190
 191                         ret = mtd->read_oob(mtd, *ppos, &ops);
 192                         retlen = ops.retlen;
 193                         break;
 194                 }
 195                 default:
 196                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 197                 }
 198                 /* Nand returns -EBADMSG on ecc errors, but it returns
 199                  * the data. For our userspace tools it is important
 200                  * to dump areas with ecc errors !
 201                  * For kernel internal usage it also might return -EUCLEAN
 202                  * to signal the caller that a bitflip has occured and has
 203                  * been corrected by the ECC algorithm.
 204                  * Userspace software which accesses NAND this way
 205                  * must be aware of the fact that it deals with NAND
 206                  */
 207                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 208                         *ppos += retlen;
 209                         if (copy_to_user(buf, kbuf, retlen)) {
 210                                 kfree(kbuf);
 211                                 return -EFAULT;
 212                         }
 213                         else
 214                                 total_retlen += retlen;
 215
 216                         count -= retlen;
 217                         buf += retlen;
 218                         if (retlen == 0)
 219                                 count = 0;
 220                 }
 221                 else {
 222                         kfree(kbuf);
 223                         return ret;
 224                 }
 225
 226         }
 227
 228         kfree(kbuf);
 229         return total_retlen;
 230 } /* mtd_read */
 231
 232 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 233 {
 234         struct mtd_file_info *mfi = file->private_data;
 235         struct mtd_info *mtd = mfi->mtd;
 236         char *kbuf;
 237         size_t retlen;
 238         size_t total_retlen=0;
 239         int ret=0;
 240         int len;
 241
 242         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 243
 244         if (*ppos == mtd->size)
 245                 return -ENOSPC;
 246
 247         if (*ppos + count > mtd->size)
 248                 count = mtd->size - *ppos;
 249
 250         if (!count)
 251                 return 0;
 252
 253         if (count > MAX_KMALLOC_SIZE)
 254                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 255         else
 256                 kbuf=kmalloc(count, GFP_KERNEL);
 257
 258         if (!kbuf)
 259                 return -ENOMEM;
 260
 261         while (count) {
 262
 263                 if (count > MAX_KMALLOC_SIZE)
 264                         len = MAX_KMALLOC_SIZE;
 265                 else
 266                         len = count;
 267
 268                 if (copy_from_user(kbuf, buf, len)) {
 269                         kfree(kbuf);
 270                         return -EFAULT;
 271                 }
 272
 273                 switch (mfi->mode) {
 274                 case MTD_MODE_OTP_FACTORY:
 275                         ret = -EROFS;
 276                         break;
 277                 case MTD_MODE_OTP_USER:
 278                         if (!mtd->write_user_prot_reg) {
 279                                 ret = -EOPNOTSUPP;
 280                                 break;
 281                         }
 282                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 283                         break;
 284
 285                 case MTD_MODE_RAW:
 286                 {
 287                         struct mtd_oob_ops ops;
 288
 289                         ops.mode = MTD_OOB_RAW;
 290                         ops.datbuf = kbuf;
 291                         ops.oobbuf = NULL;
 292                         ops.len = len;
 293
 294                         ret = mtd->write_oob(mtd, *ppos, &ops);
 295                         retlen = ops.retlen;
 296                         break;
 297                 }
 298
 299                 default:
 300                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
 301                 }
 302                 if (!ret) {
 303                         *ppos += retlen;
 304                         total_retlen += retlen;
 305                         count -= retlen;
 306                         buf += retlen;
 307                 }
 308                 else {
 309                         kfree(kbuf);
 310                         return ret;
 311                 }
 312         }
 313
 314         kfree(kbuf);
 315         return total_retlen;
 316 } /* mtd_write */
 317
 318 /*======================================================================
 319
 320     IOCTL calls for getting device parameters.
 321
 322 ======================================================================*/
 323 static void mtdchar_erase_callback (struct erase_info *instr)
 324 {
 325         wake_up((wait_queue_head_t *)instr->priv);
 326 }
 327
 328 #ifdef CONFIG_HAVE_MTD_OTP
 329 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 330 {
 331         struct mtd_info *mtd = mfi->mtd;
 332         int ret = 0;
 333
 334         switch (mode) {
 335         case MTD_OTP_FACTORY:
 336                 if (!mtd->read_fact_prot_reg)
 337                         ret = -EOPNOTSUPP;
 338                 else
 339                         mfi->mode = MTD_MODE_OTP_FACTORY;
 340                 break;
 341         case MTD_OTP_USER:
 342                 if (!mtd->read_fact_prot_reg)
 343                         ret = -EOPNOTSUPP;
 344                 else
 345                         mfi->mode = MTD_MODE_OTP_USER;
 346                 break;
 347         default:
 348                 ret = -EINVAL;
 349         case MTD_OTP_OFF:
 350                 break;
 351         }
 352         return ret;
 353 }
 354 #else
 355 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 356 #endif
 357
 358 static int mtd_ioctl(struct inode *inode, struct file *file,
 359                      u_int cmd, u_long arg)
 360 {
 361         struct mtd_file_info *mfi = file->private_data;
 362         struct mtd_info *mtd = mfi->mtd;
 363         void __user *argp = (void __user *)arg;
 364         int ret = 0;
 365         u_long size;
 366         struct mtd_info_user info;
 367
 368         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 369
 370         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 371         if (cmd & IOC_IN) {
 372                 if (!access_ok(VERIFY_READ, argp, size))
 373                         return -EFAULT;
 374         }
 375         if (cmd & IOC_OUT) {
 376                 if (!access_ok(VERIFY_WRITE, argp, size))
 377                         return -EFAULT;
 378         }
 379
 380         switch (cmd) {
 381         case MEMGETREGIONCOUNT:
 382                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 383                         return -EFAULT;
 384                 break;
 385
 386         case MEMGETREGIONINFO:
 387         {
 388                 uint32_t ur_idx;
 389                 struct mtd_erase_region_info *kr;
 390                 struct region_info_user *ur = (struct region_info_user *) argp;
 391
 392                 if (get_user(ur_idx, &(ur->regionindex)))
 393                         return -EFAULT;
 394
 395                 kr = &(mtd->eraseregions[ur_idx]);
 396
 397                 if (put_user(kr->offset, &(ur->offset))
 398                     || put_user(kr->erasesize, &(ur->erasesize))
 399                     || put_user(kr->numblocks, &(ur->numblocks)))
 400                         return -EFAULT;
 401
 402                 break;
 403         }
 404
 405         case MEMGETINFO:
 406                 info.type       = mtd->type;
 407                 info.flags      = mtd->flags;
 408                 info.size       = mtd->size;
 409                 info.erasesize  = mtd->erasesize;
 410                 info.writesize  = mtd->writesize;
 411                 info.oobsize    = mtd->oobsize;
 412                 /* The below fields are obsolete */
 413                 info.ecctype    = -1;
 414                 info.eccsize    = 0;
 415                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 416                         return -EFAULT;
 417                 break;
 418
 419         case MEMERASE:
 420         case MEMERASE64:
 421         {
 422                 struct erase_info *erase;
 423
 424                 if(!(file->f_mode & FMODE_WRITE))
 425                         return -EPERM;
 426
 427                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
 428                 if (!erase)
 429                         ret = -ENOMEM;
 430                 else {
 431                         wait_queue_head_t waitq;
 432                         DECLARE_WAITQUEUE(wait, current);
 433
 434                         init_waitqueue_head(&waitq);
 435
 436                         if (cmd == MEMERASE64) {
 437                                 struct erase_info_user64 einfo64;
 438
 439                                 if (copy_from_user(&einfo64, argp,
 440                                             sizeof(struct erase_info_user64))) {
 441                                         kfree(erase);
 442                                         return -EFAULT;
 443                                 }
 444                                 erase->addr = einfo64.start;
 445                                 erase->len = einfo64.length;
 446                         } else {
 447                                 struct erase_info_user einfo32;
 448
 449                                 if (copy_from_user(&einfo32, argp,
 450                                             sizeof(struct erase_info_user))) {
 451                                         kfree(erase);
 452                                         return -EFAULT;
 453                                 }
 454                                 erase->addr = einfo32.start;
 455                                 erase->len = einfo32.length;
 456                         }
 457                         erase->mtd = mtd;
 458                         erase->callback = mtdchar_erase_callback;
 459                         erase->priv = (unsigned long)&waitq;
 460
 461                         /*
 462                           FIXME: Allow INTERRUPTIBLE. Which means
 463                           not having the wait_queue head on the stack.
 464
 465                           If the wq_head is on the stack, and we
 466                           leave because we got interrupted, then the
 467                           wq_head is no longer there when the
 468                           callback routine tries to wake us up.
 469                         */
 470                         ret = mtd->erase(mtd, erase);
 471                         if (!ret) {
 472                                 set_current_state(TASK_UNINTERRUPTIBLE);
 473                                 add_wait_queue(&waitq, &wait);
 474                                 if (erase->state != MTD_ERASE_DONE &&
 475                                     erase->state != MTD_ERASE_FAILED)
 476                                         schedule();
 477                                 remove_wait_queue(&waitq, &wait);
 478                                 set_current_state(TASK_RUNNING);
 479
 480                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 481                         }
 482                         kfree(erase);
 483                 }
 484                 break;
 485         }
 486
 487         case MEMWRITEOOB:
 488         {
 489                 struct mtd_oob_buf buf;
 490                 struct mtd_oob_ops ops;
 491                 struct mtd_oob_buf __user *user_buf = argp;
 492                 uint32_t retlen;
 493
 494                 if(!(file->f_mode & FMODE_WRITE))
 495                         return -EPERM;
 496
 497                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 498                         return -EFAULT;
 499
 500                 if (buf.length > 4096)
 501                         return -EINVAL;
 502
 503                 if (!mtd->write_oob)
 504                         ret = -EOPNOTSUPP;
 505                 else
 506                         ret = access_ok(VERIFY_READ, buf.ptr,
 507                                         buf.length) ? 0 : EFAULT;
 508
 509                 if (ret)
 510                         return ret;
 511
 512                 ops.ooblen = buf.length;
 513                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 514                 ops.datbuf = NULL;
 515                 ops.mode = MTD_OOB_PLACE;
 516
 517                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 518                         return -EINVAL;
 519
 520                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 521                 if (!ops.oobbuf)
 522                         return -ENOMEM;
 523
 524                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 525                         kfree(ops.oobbuf);
 526                         return -EFAULT;
 527                 }
 528
 529                 buf.start &= ~(mtd->oobsize - 1);
 530                 ret = mtd->write_oob(mtd, buf.start, &ops);
 531
 532                 if (ops.oobretlen > 0xFFFFFFFFU)
 533                         ret = -EOVERFLOW;
 534                 retlen = ops.oobretlen;
 535                 if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
 536                         ret = -EFAULT;
 537
 538                 kfree(ops.oobbuf);
 539                 break;
 540
 541         }
 542
 543         case MEMREADOOB:
 544         {
 545                 struct mtd_oob_buf buf;
 546                 struct mtd_oob_ops ops;
 547
 548                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 549                         return -EFAULT;
 550
 551                 if (buf.length > 4096)
 552                         return -EINVAL;
 553
 554                 if (!mtd->read_oob)
 555                         ret = -EOPNOTSUPP;
 556                 else
 557                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 558                                         buf.length) ? 0 : -EFAULT;
 559                 if (ret)
 560                         return ret;
 561
 562                 ops.ooblen = buf.length;
 563                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 564                 ops.datbuf = NULL;
 565                 ops.mode = MTD_OOB_PLACE;
 566
 567                 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
 568                         return -EINVAL;
 569
 570                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 571                 if (!ops.oobbuf)
 572                         return -ENOMEM;
 573
 574                 buf.start &= ~(mtd->oobsize - 1);
 575                 ret = mtd->read_oob(mtd, buf.start, &ops);
 576
 577                 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
 578                         ret = -EFAULT;
 579                 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
 580                                                     ops.oobretlen))
 581                         ret = -EFAULT;
 582
 583                 kfree(ops.oobbuf);
 584                 break;
 585         }
 586
 587         case MEMLOCK:
 588         {
 589                 struct erase_info_user einfo;
 590
 591                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
 592                         return -EFAULT;
 593
 594                 if (!mtd->lock)
 595                         ret = -EOPNOTSUPP;
 596                 else
 597                         ret = mtd->lock(mtd, einfo.start, einfo.length);
 598                 break;
 599         }
 600
 601         case MEMUNLOCK:
 602         {
 603                 struct erase_info_user einfo;
 604
 605                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
 606                         return -EFAULT;
 607
 608                 if (!mtd->unlock)
 609                         ret = -EOPNOTSUPP;
 610                 else
 611                         ret = mtd->unlock(mtd, einfo.start, einfo.length);
 612                 break;
 613         }
 614
 615         /* Legacy interface */
 616         case MEMGETOOBSEL:
 617         {
 618                 struct nand_oobinfo oi;
 619
 620                 if (!mtd->ecclayout)
 621                         return -EOPNOTSUPP;
 622                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 623                         return -EINVAL;
 624
 625                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 626                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 627                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 628                        sizeof(oi.oobfree));
 629                 oi.eccbytes = mtd->ecclayout->eccbytes;
 630
 631                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 632                         return -EFAULT;
 633                 break;
 634         }
 635
 636         case MEMGETBADBLOCK:
 637         {
 638                 loff_t offs;
 639
 640                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 641                         return -EFAULT;
 642                 if (!mtd->block_isbad)
 643                         ret = -EOPNOTSUPP;
 644                 else
 645                         return mtd->block_isbad(mtd, offs);
 646                 break;
 647         }
 648
 649         case MEMSETBADBLOCK:
 650         {
 651                 loff_t offs;
 652
 653                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 654                         return -EFAULT;
 655                 if (!mtd->block_markbad)
 656                         ret = -EOPNOTSUPP;
 657                 else
 658                         return mtd->block_markbad(mtd, offs);
 659                 break;
 660         }
 661
 662 #ifdef CONFIG_HAVE_MTD_OTP
 663         case OTPSELECT:
 664         {
 665                 int mode;
 666                 if (copy_from_user(&mode, argp, sizeof(int)))
 667                         return -EFAULT;
 668
 669                 mfi->mode = MTD_MODE_NORMAL;
 670
 671                 ret = otp_select_filemode(mfi, mode);
 672
 673                 file->f_pos = 0;
 674                 break;
 675         }
 676
 677         case OTPGETREGIONCOUNT:
 678         case OTPGETREGIONINFO:
 679         {
 680                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 681                 if (!buf)
 682                         return -ENOMEM;
 683                 ret = -EOPNOTSUPP;
 684                 switch (mfi->mode) {
 685                 case MTD_MODE_OTP_FACTORY:
 686                         if (mtd->get_fact_prot_info)
 687                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 688                         break;
 689                 case MTD_MODE_OTP_USER:
 690                         if (mtd->get_user_prot_info)
 691                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 692                         break;
 693                 default:
 694                         break;
 695                 }
 696                 if (ret >= 0) {
 697                         if (cmd == OTPGETREGIONCOUNT) {
 698                                 int nbr = ret / sizeof(struct otp_info);
 699                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 700                         } else
 701                                 ret = copy_to_user(argp, buf, ret);
 702                         if (ret)
 703                                 ret = -EFAULT;
 704                 }
 705                 kfree(buf);
 706                 break;
 707         }
 708
 709         case OTPLOCK:
 710         {
 711                 struct otp_info oinfo;
 712
 713                 if (mfi->mode != MTD_MODE_OTP_USER)
 714                         return -EINVAL;
 715                 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
 716                         return -EFAULT;
 717                 if (!mtd->lock_user_prot_reg)
 718                         return -EOPNOTSUPP;
 719                 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
 720                 break;
 721         }
 722 #endif
 723
 724         case ECCGETLAYOUT:
 725         {
 726                 if (!mtd->ecclayout)
 727                         return -EOPNOTSUPP;
 728
 729                 if (copy_to_user(argp, mtd->ecclayout,
 730                                  sizeof(struct nand_ecclayout)))
 731                         return -EFAULT;
 732                 break;
 733         }
 734
 735         case ECCGETSTATS:
 736         {
 737                 if (copy_to_user(argp, &mtd->ecc_stats,
 738                                  sizeof(struct mtd_ecc_stats)))
 739                         return -EFAULT;
 740                 break;
 741         }
 742
 743         case MTDFILEMODE:
 744         {
 745                 mfi->mode = 0;
 746
 747                 switch(arg) {
 748                 case MTD_MODE_OTP_FACTORY:
 749                 case MTD_MODE_OTP_USER:
 750                         ret = otp_select_filemode(mfi, arg);
 751                         break;
 752
 753                 case MTD_MODE_RAW:
 754                         if (!mtd->read_oob || !mtd->write_oob)
 755                                 return -EOPNOTSUPP;
 756                         mfi->mode = arg;
 757
 758                 case MTD_MODE_NORMAL:
 759                         break;
 760                 default:
 761                         ret = -EINVAL;
 762                 }
 763                 file->f_pos = 0;
 764                 break;
 765         }
 766
 767         default:
 768                 ret = -ENOTTY;
 769         }
 770
 771         return ret;
 772 } /* memory_ioctl */
 773
 774 /*
 775  * try to determine where a shared mapping can be made
 776  * - only supported for NOMMU at the moment (MMU can't doesn't copy private
 777  *   mappings)
 778  */
 779 #ifndef CONFIG_MMU
 780 static unsigned long mtd_get_unmapped_area(struct file *file,
 781                                            unsigned long addr,
 782                                            unsigned long len,
 783                                            unsigned long pgoff,
 784                                            unsigned long flags)
 785 {
 786         struct mtd_file_info *mfi = file->private_data;
 787         struct mtd_info *mtd = mfi->mtd;
 788
 789         if (mtd->get_unmapped_area) {
 790                 unsigned long offset;
 791
 792                 if (addr != 0)
 793                         return (unsigned long) -EINVAL;
 794
 795                 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
 796                         return (unsigned long) -EINVAL;
 797
 798                 offset = pgoff << PAGE_SHIFT;
 799                 if (offset > mtd->size - len)
 800                         return (unsigned long) -EINVAL;
 801
 802                 return mtd->get_unmapped_area(mtd, len, offset, flags);
 803         }
 804
 805         /* can't map directly */
 806         return (unsigned long) -ENOSYS;
 807 }
 808 #endif
 809
 810 /*
 811  * set up a mapping for shared memory segments
 812  */
 813 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
 814 {
 815 #ifdef CONFIG_MMU
 816         struct mtd_file_info *mfi = file->private_data;
 817         struct mtd_info *mtd = mfi->mtd;
 818
 819         if (mtd->type == MTD_RAM || mtd->type == MTD_ROM)
 820                 return 0;
 821         return -ENOSYS;
 822 #else
 823         return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
 824 #endif
 825 }
 826
 827 static const struct file_operations mtd_fops = {
 828         .owner          = THIS_MODULE,
 829         .llseek         = mtd_lseek,
 830         .read           = mtd_read,
 831         .write          = mtd_write,
 832         .ioctl          = mtd_ioctl,
 833         .open           = mtd_open,
 834         .release        = mtd_close,
 835         .mmap           = mtd_mmap,
 836 #ifndef CONFIG_MMU
 837         .get_unmapped_area = mtd_get_unmapped_area,
 838 #endif
 839 };
 840
 841 static int __init init_mtdchar(void)
 842 {
 843         int status;
 844
 845         status = register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops);
 846         if (status < 0) {
 847                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 848                        MTD_CHAR_MAJOR);
 849         }
 850
 851         return status;
 852 }
 853
 854 static void __exit cleanup_mtdchar(void)
 855 {
 856         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 857 }
 858
 859 module_init(init_mtdchar);
 860 module_exit(cleanup_mtdchar);
 861
 862 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
 863
 864 MODULE_LICENSE("GPL");
 865 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 866 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
 867 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);