drivers/mtd/mtdchar.c

   1 /*
   2  * $Id: mtdchar.c,v 1.76 2005/11/07 11:14:20 gleixner Exp $
   3  *
   4  * Character-device access to raw MTD devices.
   5  *
   6  */
   7
   8 #include <linux/device.h>
   9 #include <linux/fs.h>
  10 #include <linux/init.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/slab.h>
  14 #include <linux/sched.h>
  15
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/compatmac.h>
  18
  19 #include <asm/semaphore.h>
  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         class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
  30                             NULL, "mtd%d", mtd->index);
  31
  32         class_device_create(mtd_class, NULL,
  33                             MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
  34                             NULL, "mtd%dro", mtd->index);
  35 }
  36
  37 static void mtd_notify_remove(struct mtd_info* mtd)
  38 {
  39         if (!mtd)
  40                 return;
  41
  42         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
  43         class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
  44 }
  45
  46 static struct mtd_notifier notifier = {
  47         .add    = mtd_notify_add,
  48         .remove = mtd_notify_remove,
  49 };
  50
  51 /*
  52  * Data structure to hold the pointer to the mtd device as well
  53  * as mode information ofr various use cases.
  54  */
  55 struct mtd_file_info {
  56         struct mtd_info *mtd;
  57         enum mtd_file_modes mode;
  58 };
  59
  60 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
  61 {
  62         struct mtd_file_info *mfi = file->private_data;
  63         struct mtd_info *mtd = mfi->mtd;
  64
  65         switch (orig) {
  66         case SEEK_SET:
  67                 break;
  68         case SEEK_CUR:
  69                 offset += file->f_pos;
  70                 break;
  71         case SEEK_END:
  72                 offset += mtd->size;
  73                 break;
  74         default:
  75                 return -EINVAL;
  76         }
  77
  78         if (offset >= 0 && offset <= mtd->size)
  79                 return file->f_pos = offset;
  80
  81         return -EINVAL;
  82 }
  83
  84
  85
  86 static int mtd_open(struct inode *inode, struct file *file)
  87 {
  88         int minor = iminor(inode);
  89         int devnum = minor >> 1;
  90         struct mtd_info *mtd;
  91         struct mtd_file_info *mfi;
  92
  93         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
  94
  95         if (devnum >= MAX_MTD_DEVICES)
  96                 return -ENODEV;
  97
  98         /* You can't open the RO devices RW */
  99         if ((file->f_mode & 2) && (minor & 1))
 100                 return -EACCES;
 101
 102         mtd = get_mtd_device(NULL, devnum);
 103
 104         if (!mtd)
 105                 return -ENODEV;
 106
 107         if (MTD_ABSENT == mtd->type) {
 108                 put_mtd_device(mtd);
 109                 return -ENODEV;
 110         }
 111
 112         /* You can't open it RW if it's not a writeable device */
 113         if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
 114                 put_mtd_device(mtd);
 115                 return -EACCES;
 116         }
 117
 118         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
 119         if (!mfi) {
 120                 put_mtd_device(mtd);
 121                 return -ENOMEM;
 122         }
 123         mfi->mtd = mtd;
 124         file->private_data = mfi;
 125
 126         return 0;
 127 } /* mtd_open */
 128
 129 /*====================================================================*/
 130
 131 static int mtd_close(struct inode *inode, struct file *file)
 132 {
 133         struct mtd_file_info *mfi = file->private_data;
 134         struct mtd_info *mtd = mfi->mtd;
 135
 136         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
 137
 138         if (mtd->sync)
 139                 mtd->sync(mtd);
 140
 141         put_mtd_device(mtd);
 142         file->private_data = NULL;
 143         kfree(mfi);
 144
 145         return 0;
 146 } /* mtd_close */
 147
 148 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
 149    userspace buffer down and use it directly with readv/writev.
 150 */
 151 #define MAX_KMALLOC_SIZE 0x2000
 152
 153 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
 154 {
 155         struct mtd_file_info *mfi = file->private_data;
 156         struct mtd_info *mtd = mfi->mtd;
 157         size_t retlen=0;
 158         size_t total_retlen=0;
 159         int ret=0;
 160         int len;
 161         char *kbuf;
 162
 163         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
 164
 165         if (*ppos + count > mtd->size)
 166                 count = mtd->size - *ppos;
 167
 168         if (!count)
 169                 return 0;
 170
 171         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
 172            and pass them directly to the MTD functions */
 173
 174         if (count > MAX_KMALLOC_SIZE)
 175                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
 176         else
 177                 kbuf=kmalloc(count, GFP_KERNEL);
 178
 179         if (!kbuf)
 180                 return -ENOMEM;
 181
 182         while (count) {
 183
 184                 if (count > MAX_KMALLOC_SIZE)
 185                         len = MAX_KMALLOC_SIZE;
 186                 else
 187                         len = count;
 188
 189                 switch (mfi->mode) {
 190                 case MTD_MODE_OTP_FACTORY:
 191                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 192                         break;
 193                 case MTD_MODE_OTP_USER:
 194                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
 195                         break;
 196                 case MTD_MODE_RAW:
 197                 {
 198                         struct mtd_oob_ops ops;
 199
 200                         ops.mode = MTD_OOB_RAW;
 201                         ops.datbuf = kbuf;
 202                         ops.oobbuf = NULL;
 203                         ops.len = len;
 204
 205                         ret = mtd->read_oob(mtd, *ppos, &ops);
 206                         retlen = ops.retlen;
 207                         break;
 208                 }
 209                 default:
 210                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
 211                 }
 212                 /* Nand returns -EBADMSG on ecc errors, but it returns
 213                  * the data. For our userspace tools it is important
 214                  * to dump areas with ecc errors !
 215                  * For kernel internal usage it also might return -EUCLEAN
 216                  * to signal the caller that a bitflip has occured and has
 217                  * been corrected by the ECC algorithm.
 218                  * Userspace software which accesses NAND this way
 219                  * must be aware of the fact that it deals with NAND
 220                  */
 221                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
 222                         *ppos += retlen;
 223                         if (copy_to_user(buf, kbuf, retlen)) {
 224                                 kfree(kbuf);
 225                                 return -EFAULT;
 226                         }
 227                         else
 228                                 total_retlen += retlen;
 229
 230                         count -= retlen;
 231                         buf += retlen;
 232                         if (retlen == 0)
 233                                 count = 0;
 234                 }
 235                 else {
 236                         kfree(kbuf);
 237                         return ret;
 238                 }
 239
 240         }
 241
 242         kfree(kbuf);
 243         return total_retlen;
 244 } /* mtd_read */
 245
 246 #define WRITE_KBUF_SIZE MAX_KMALLOC_SIZE
 247 static DECLARE_MUTEX(write_kbuf_sem);
 248 static char *write_kbuf;
 249
 250 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
 251 {
 252         struct mtd_file_info *mfi = file->private_data;
 253         struct mtd_info *mtd = mfi->mtd;
 254         size_t retlen;
 255         size_t total_retlen=0;
 256         int ret=0;
 257         int len;
 258
 259         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
 260
 261         if (*ppos == mtd->size)
 262                 return -ENOSPC;
 263
 264         if (*ppos + count > mtd->size)
 265                 count = mtd->size - *ppos;
 266
 267         if (!count)
 268                 return 0;
 269
 270         down(&write_kbuf_sem);
 271
 272         while (count) {
 273
 274                 if (count > WRITE_KBUF_SIZE)
 275                         len = WRITE_KBUF_SIZE;
 276                 else
 277                         len = count;
 278
 279                 if (copy_from_user(write_kbuf, buf, len)) {
 280                         up(&write_kbuf_sem);
 281                         return -EFAULT;
 282                 }
 283
 284                 switch (mfi->mode) {
 285                 case MTD_MODE_OTP_FACTORY:
 286                         ret = -EROFS;
 287                         break;
 288                 case MTD_MODE_OTP_USER:
 289                         if (!mtd->write_user_prot_reg) {
 290                                 ret = -EOPNOTSUPP;
 291                                 break;
 292                         }
 293                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, write_kbuf);
 294                         break;
 295
 296                 case MTD_MODE_RAW:
 297                 {
 298                         struct mtd_oob_ops ops;
 299
 300                         ops.mode = MTD_OOB_RAW;
 301                         ops.datbuf = write_kbuf;
 302                         ops.oobbuf = NULL;
 303                         ops.len = len;
 304
 305                         ret = mtd->write_oob(mtd, *ppos, &ops);
 306                         retlen = ops.retlen;
 307                         break;
 308                 }
 309
 310                 default:
 311                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, write_kbuf);
 312                 }
 313                 if (!ret) {
 314                         *ppos += retlen;
 315                         total_retlen += retlen;
 316                         count -= retlen;
 317                         buf += retlen;
 318                 }
 319                 else {
 320                         up(&write_kbuf_sem);
 321                         return ret;
 322                 }
 323         }
 324
 325         up(&write_kbuf_sem);
 326         return total_retlen;
 327 } /* mtd_write */
 328
 329 /*======================================================================
 330
 331     IOCTL calls for getting device parameters.
 332
 333 ======================================================================*/
 334 static void mtdchar_erase_callback (struct erase_info *instr)
 335 {
 336         wake_up((wait_queue_head_t *)instr->priv);
 337 }
 338
 339 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 340 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 341 {
 342         struct mtd_info *mtd = mfi->mtd;
 343         int ret = 0;
 344
 345         switch (mode) {
 346         case MTD_OTP_FACTORY:
 347                 if (!mtd->read_fact_prot_reg)
 348                         ret = -EOPNOTSUPP;
 349                 else
 350                         mfi->mode = MTD_MODE_OTP_FACTORY;
 351                 break;
 352         case MTD_OTP_USER:
 353                 if (!mtd->read_fact_prot_reg)
 354                         ret = -EOPNOTSUPP;
 355                 else
 356                         mfi->mode = MTD_MODE_OTP_USER;
 357                 break;
 358         default:
 359                 ret = -EINVAL;
 360         case MTD_OTP_OFF:
 361                 break;
 362         }
 363         return ret;
 364 }
 365 #else
 366 # define otp_select_filemode(f,m)       -EOPNOTSUPP
 367 #endif
 368
 369 static int mtd_ioctl(struct inode *inode, struct file *file,
 370                      u_int cmd, u_long arg)
 371 {
 372         struct mtd_file_info *mfi = file->private_data;
 373         struct mtd_info *mtd = mfi->mtd;
 374         void __user *argp = (void __user *)arg;
 375         int ret = 0;
 376         u_long size;
 377         struct mtd_info_user info;
 378
 379         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
 380
 381         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
 382         if (cmd & IOC_IN) {
 383                 if (!access_ok(VERIFY_READ, argp, size))
 384                         return -EFAULT;
 385         }
 386         if (cmd & IOC_OUT) {
 387                 if (!access_ok(VERIFY_WRITE, argp, size))
 388                         return -EFAULT;
 389         }
 390
 391         switch (cmd) {
 392         case MEMGETREGIONCOUNT:
 393                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
 394                         return -EFAULT;
 395                 break;
 396
 397         case MEMGETREGIONINFO:
 398         {
 399                 struct region_info_user ur;
 400
 401                 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
 402                         return -EFAULT;
 403
 404                 if (ur.regionindex >= mtd->numeraseregions)
 405                         return -EINVAL;
 406                 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
 407                                 sizeof(struct mtd_erase_region_info)))
 408                         return -EFAULT;
 409                 break;
 410         }
 411
 412         case MEMGETINFO:
 413                 info.type       = mtd->type;
 414                 info.flags      = mtd->flags;
 415                 info.size       = mtd->size;
 416                 info.erasesize  = mtd->erasesize;
 417                 info.writesize  = mtd->writesize;
 418                 info.oobsize    = mtd->oobsize;
 419                 info.ecctype    = mtd->ecctype;
 420                 info.eccsize    = mtd->eccsize;
 421                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
 422                         return -EFAULT;
 423                 break;
 424
 425         case MEMERASE:
 426         {
 427                 struct erase_info *erase;
 428
 429                 if(!(file->f_mode & 2))
 430                         return -EPERM;
 431
 432                 erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL);
 433                 if (!erase)
 434                         ret = -ENOMEM;
 435                 else {
 436                         wait_queue_head_t waitq;
 437                         DECLARE_WAITQUEUE(wait, current);
 438
 439                         init_waitqueue_head(&waitq);
 440
 441                         memset (erase,0,sizeof(struct erase_info));
 442                         if (copy_from_user(&erase->addr, argp,
 443                                     sizeof(struct erase_info_user))) {
 444                                 kfree(erase);
 445                                 return -EFAULT;
 446                         }
 447                         erase->mtd = mtd;
 448                         erase->callback = mtdchar_erase_callback;
 449                         erase->priv = (unsigned long)&waitq;
 450
 451                         /*
 452                           FIXME: Allow INTERRUPTIBLE. Which means
 453                           not having the wait_queue head on the stack.
 454
 455                           If the wq_head is on the stack, and we
 456                           leave because we got interrupted, then the
 457                           wq_head is no longer there when the
 458                           callback routine tries to wake us up.
 459                         */
 460                         ret = mtd->erase(mtd, erase);
 461                         if (!ret) {
 462                                 set_current_state(TASK_UNINTERRUPTIBLE);
 463                                 add_wait_queue(&waitq, &wait);
 464                                 if (erase->state != MTD_ERASE_DONE &&
 465                                     erase->state != MTD_ERASE_FAILED)
 466                                         schedule();
 467                                 remove_wait_queue(&waitq, &wait);
 468                                 set_current_state(TASK_RUNNING);
 469
 470                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
 471                         }
 472                         kfree(erase);
 473                 }
 474                 break;
 475         }
 476
 477         case MEMWRITEOOB:
 478         {
 479                 struct mtd_oob_buf buf;
 480                 struct mtd_oob_ops ops;
 481
 482                 if(!(file->f_mode & 2))
 483                         return -EPERM;
 484
 485                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 486                         return -EFAULT;
 487
 488                 if (buf.length > 4096)
 489                         return -EINVAL;
 490
 491                 if (!mtd->write_oob)
 492                         ret = -EOPNOTSUPP;
 493                 else
 494                         ret = access_ok(VERIFY_READ, buf.ptr,
 495                                         buf.length) ? 0 : EFAULT;
 496
 497                 if (ret)
 498                         return ret;
 499
 500                 ops.len = buf.length;
 501                 ops.ooblen = buf.length;
 502                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 503                 ops.datbuf = NULL;
 504                 ops.mode = MTD_OOB_PLACE;
 505
 506                 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 507                         return -EINVAL;
 508
 509                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 510                 if (!ops.oobbuf)
 511                         return -ENOMEM;
 512
 513                 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
 514                         kfree(ops.oobbuf);
 515                         return -EFAULT;
 516                 }
 517
 518                 buf.start &= ~(mtd->oobsize - 1);
 519                 ret = mtd->write_oob(mtd, buf.start, &ops);
 520
 521                 if (copy_to_user(argp + sizeof(uint32_t), &ops.retlen,
 522                                  sizeof(uint32_t)))
 523                         ret = -EFAULT;
 524
 525                 kfree(ops.oobbuf);
 526                 break;
 527
 528         }
 529
 530         case MEMREADOOB:
 531         {
 532                 struct mtd_oob_buf buf;
 533                 struct mtd_oob_ops ops;
 534
 535                 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
 536                         return -EFAULT;
 537
 538                 if (buf.length > 4096)
 539                         return -EINVAL;
 540
 541                 if (!mtd->read_oob)
 542                         ret = -EOPNOTSUPP;
 543                 else
 544                         ret = access_ok(VERIFY_WRITE, buf.ptr,
 545                                         buf.length) ? 0 : -EFAULT;
 546                 if (ret)
 547                         return ret;
 548
 549                 ops.len = buf.length;
 550                 ops.ooblen = buf.length;
 551                 ops.ooboffs = buf.start & (mtd->oobsize - 1);
 552                 ops.datbuf = NULL;
 553                 ops.mode = MTD_OOB_PLACE;
 554
 555                 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
 556                         return -EINVAL;
 557
 558                 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
 559                 if (!ops.oobbuf)
 560                         return -ENOMEM;
 561
 562                 buf.start &= ~(mtd->oobsize - 1);
 563                 ret = mtd->read_oob(mtd, buf.start, &ops);
 564
 565                 if (put_user(ops.retlen, (uint32_t __user *)argp))
 566                         ret = -EFAULT;
 567                 else if (ops.retlen && copy_to_user(buf.ptr, ops.oobbuf,
 568                                                     ops.retlen))
 569                         ret = -EFAULT;
 570
 571                 kfree(ops.oobbuf);
 572                 break;
 573         }
 574
 575         case MEMLOCK:
 576         {
 577                 struct erase_info_user info;
 578
 579                 if (copy_from_user(&info, argp, sizeof(info)))
 580                         return -EFAULT;
 581
 582                 if (!mtd->lock)
 583                         ret = -EOPNOTSUPP;
 584                 else
 585                         ret = mtd->lock(mtd, info.start, info.length);
 586                 break;
 587         }
 588
 589         case MEMUNLOCK:
 590         {
 591                 struct erase_info_user info;
 592
 593                 if (copy_from_user(&info, argp, sizeof(info)))
 594                         return -EFAULT;
 595
 596                 if (!mtd->unlock)
 597                         ret = -EOPNOTSUPP;
 598                 else
 599                         ret = mtd->unlock(mtd, info.start, info.length);
 600                 break;
 601         }
 602
 603         /* Legacy interface */
 604         case MEMGETOOBSEL:
 605         {
 606                 struct nand_oobinfo oi;
 607
 608                 if (!mtd->ecclayout)
 609                         return -EOPNOTSUPP;
 610                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
 611                         return -EINVAL;
 612
 613                 oi.useecc = MTD_NANDECC_AUTOPLACE;
 614                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
 615                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
 616                        sizeof(oi.oobfree));
 617
 618                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
 619                         return -EFAULT;
 620                 break;
 621         }
 622
 623         case MEMGETBADBLOCK:
 624         {
 625                 loff_t offs;
 626
 627                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 628                         return -EFAULT;
 629                 if (!mtd->block_isbad)
 630                         ret = -EOPNOTSUPP;
 631                 else
 632                         return mtd->block_isbad(mtd, offs);
 633                 break;
 634         }
 635
 636         case MEMSETBADBLOCK:
 637         {
 638                 loff_t offs;
 639
 640                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
 641                         return -EFAULT;
 642                 if (!mtd->block_markbad)
 643                         ret = -EOPNOTSUPP;
 644                 else
 645                         return mtd->block_markbad(mtd, offs);
 646                 break;
 647         }
 648
 649 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
 650         case OTPSELECT:
 651         {
 652                 int mode;
 653                 if (copy_from_user(&mode, argp, sizeof(int)))
 654                         return -EFAULT;
 655
 656                 mfi->mode = MTD_MODE_NORMAL;
 657
 658                 ret = otp_select_filemode(mfi, mode);
 659
 660                 file->f_pos = 0;
 661                 break;
 662         }
 663
 664         case OTPGETREGIONCOUNT:
 665         case OTPGETREGIONINFO:
 666         {
 667                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
 668                 if (!buf)
 669                         return -ENOMEM;
 670                 ret = -EOPNOTSUPP;
 671                 switch (mfi->mode) {
 672                 case MTD_MODE_OTP_FACTORY:
 673                         if (mtd->get_fact_prot_info)
 674                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
 675                         break;
 676                 case MTD_MODE_OTP_USER:
 677                         if (mtd->get_user_prot_info)
 678                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
 679                         break;
 680                 default:
 681                         break;
 682                 }
 683                 if (ret >= 0) {
 684                         if (cmd == OTPGETREGIONCOUNT) {
 685                                 int nbr = ret / sizeof(struct otp_info);
 686                                 ret = copy_to_user(argp, &nbr, sizeof(int));
 687                         } else
 688                                 ret = copy_to_user(argp, buf, ret);
 689                         if (ret)
 690                                 ret = -EFAULT;
 691                 }
 692                 kfree(buf);
 693                 break;
 694         }
 695
 696         case OTPLOCK:
 697         {
 698                 struct otp_info info;
 699
 700                 if (mfi->mode != MTD_MODE_OTP_USER)
 701                         return -EINVAL;
 702                 if (copy_from_user(&info, argp, sizeof(info)))
 703                         return -EFAULT;
 704                 if (!mtd->lock_user_prot_reg)
 705                         return -EOPNOTSUPP;
 706                 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
 707                 break;
 708         }
 709 #endif
 710
 711         case ECCGETLAYOUT:
 712         {
 713                 if (!mtd->ecclayout)
 714                         return -EOPNOTSUPP;
 715
 716                 if (copy_to_user(argp, &mtd->ecclayout,
 717                                  sizeof(struct nand_ecclayout)))
 718                         return -EFAULT;
 719                 break;
 720         }
 721
 722         case ECCGETSTATS:
 723         {
 724                 if (copy_to_user(argp, &mtd->ecc_stats,
 725                                  sizeof(struct mtd_ecc_stats)))
 726                         return -EFAULT;
 727                 break;
 728         }
 729
 730         case MTDFILEMODE:
 731         {
 732                 mfi->mode = 0;
 733
 734                 switch(arg) {
 735                 case MTD_MODE_OTP_FACTORY:
 736                 case MTD_MODE_OTP_USER:
 737                         ret = otp_select_filemode(mfi, arg);
 738                         break;
 739
 740                 case MTD_MODE_RAW:
 741                         if (!mtd->read_oob || !mtd->write_oob)
 742                                 return -EOPNOTSUPP;
 743                         mfi->mode = arg;
 744
 745                 case MTD_MODE_NORMAL:
 746                         break;
 747                 default:
 748                         ret = -EINVAL;
 749                 }
 750                 file->f_pos = 0;
 751                 break;
 752         }
 753
 754         default:
 755                 ret = -ENOTTY;
 756         }
 757
 758         return ret;
 759 } /* memory_ioctl */
 760
 761 static struct file_operations mtd_fops = {
 762         .owner          = THIS_MODULE,
 763         .llseek         = mtd_lseek,
 764         .read           = mtd_read,
 765         .write          = mtd_write,
 766         .ioctl          = mtd_ioctl,
 767         .open           = mtd_open,
 768         .release        = mtd_close,
 769 };
 770
 771 static int __init init_mtdchar(void)
 772 {
 773         if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
 774                 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
 775                        MTD_CHAR_MAJOR);
 776                 return -EAGAIN;
 777         }
 778
 779         mtd_class = class_create(THIS_MODULE, "mtd");
 780
 781         if (IS_ERR(mtd_class)) {
 782                 printk(KERN_ERR "Error creating mtd class.\n");
 783                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 784                 return PTR_ERR(mtd_class);
 785         }
 786
 787         /* Allocate write buffer. */
 788         down(&write_kbuf_sem);
 789         write_kbuf = kmalloc(WRITE_KBUF_SIZE, GFP_KERNEL);
 790         if (write_kbuf == NULL) {
 791                 up(&write_kbuf_sem);
 792                 class_destroy(mtd_class);
 793                 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 794                 return -ENOMEM;
 795         }
 796         up(&write_kbuf_sem);
 797
 798         register_mtd_user(&notifier);
 799         return 0;
 800 }
 801
 802 static void __exit cleanup_mtdchar(void)
 803 {
 804         unregister_mtd_user(&notifier);
 805         class_destroy(mtd_class);
 806         unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
 807 }
 808
 809 module_init(init_mtdchar);
 810 module_exit(cleanup_mtdchar);
 811
 812
 813 MODULE_LICENSE("GPL");
 814 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 815 MODULE_DESCRIPTION("Direct character-device access to MTD devices");