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/err.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/module.h> 14 #include <linux/slab.h> 15 #include <linux/sched.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 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 (IS_ERR(mtd)) 105 return PTR_ERR(mtd); 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 0x20000 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 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) 247 { 248 struct mtd_file_info *mfi = file->private_data; 249 struct mtd_info *mtd = mfi->mtd; 250 char *kbuf; 251 size_t retlen; 252 size_t total_retlen=0; 253 int ret=0; 254 int len; 255 256 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); 257 258 if (*ppos == mtd->size) 259 return -ENOSPC; 260 261 if (*ppos + count > mtd->size) 262 count = mtd->size - *ppos; 263 264 if (!count) 265 return 0; 266 267 if (count > MAX_KMALLOC_SIZE) 268 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); 269 else 270 kbuf=kmalloc(count, GFP_KERNEL); 271 272 if (!kbuf) 273 return -ENOMEM; 274 275 while (count) { 276 277 if (count > MAX_KMALLOC_SIZE) 278 len = MAX_KMALLOC_SIZE; 279 else 280 len = count; 281 282 if (copy_from_user(kbuf, buf, len)) { 283 kfree(kbuf); 284 return -EFAULT; 285 } 286 287 switch (mfi->mode) { 288 case MTD_MODE_OTP_FACTORY: 289 ret = -EROFS; 290 break; 291 case MTD_MODE_OTP_USER: 292 if (!mtd->write_user_prot_reg) { 293 ret = -EOPNOTSUPP; 294 break; 295 } 296 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); 297 break; 298 299 case MTD_MODE_RAW: 300 { 301 struct mtd_oob_ops ops; 302 303 ops.mode = MTD_OOB_RAW; 304 ops.datbuf = kbuf; 305 ops.oobbuf = NULL; 306 ops.len = len; 307 308 ret = mtd->write_oob(mtd, *ppos, &ops); 309 retlen = ops.retlen; 310 break; 311 } 312 313 default: 314 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); 315 } 316 if (!ret) { 317 *ppos += retlen; 318 total_retlen += retlen; 319 count -= retlen; 320 buf += retlen; 321 } 322 else { 323 kfree(kbuf); 324 return ret; 325 } 326 } 327 328 kfree(kbuf); 329 return total_retlen; 330 } /* mtd_write */ 331 332 /*====================================================================== 333 334 IOCTL calls for getting device parameters. 335 336 ======================================================================*/ 337 static void mtdchar_erase_callback (struct erase_info *instr) 338 { 339 wake_up((wait_queue_head_t *)instr->priv); 340 } 341 342 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) 343 static int otp_select_filemode(struct mtd_file_info *mfi, int mode) 344 { 345 struct mtd_info *mtd = mfi->mtd; 346 int ret = 0; 347 348 switch (mode) { 349 case MTD_OTP_FACTORY: 350 if (!mtd->read_fact_prot_reg) 351 ret = -EOPNOTSUPP; 352 else 353 mfi->mode = MTD_MODE_OTP_FACTORY; 354 break; 355 case MTD_OTP_USER: 356 if (!mtd->read_fact_prot_reg) 357 ret = -EOPNOTSUPP; 358 else 359 mfi->mode = MTD_MODE_OTP_USER; 360 break; 361 default: 362 ret = -EINVAL; 363 case MTD_OTP_OFF: 364 break; 365 } 366 return ret; 367 } 368 #else 369 # define otp_select_filemode(f,m) -EOPNOTSUPP 370 #endif 371 372 static int mtd_ioctl(struct inode *inode, struct file *file, 373 u_int cmd, u_long arg) 374 { 375 struct mtd_file_info *mfi = file->private_data; 376 struct mtd_info *mtd = mfi->mtd; 377 void __user *argp = (void __user *)arg; 378 int ret = 0; 379 u_long size; 380 struct mtd_info_user info; 381 382 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); 383 384 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; 385 if (cmd & IOC_IN) { 386 if (!access_ok(VERIFY_READ, argp, size)) 387 return -EFAULT; 388 } 389 if (cmd & IOC_OUT) { 390 if (!access_ok(VERIFY_WRITE, argp, size)) 391 return -EFAULT; 392 } 393 394 switch (cmd) { 395 case MEMGETREGIONCOUNT: 396 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) 397 return -EFAULT; 398 break; 399 400 case MEMGETREGIONINFO: 401 { 402 struct region_info_user ur; 403 404 if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) 405 return -EFAULT; 406 407 if (ur.regionindex >= mtd->numeraseregions) 408 return -EINVAL; 409 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), 410 sizeof(struct mtd_erase_region_info))) 411 return -EFAULT; 412 break; 413 } 414 415 case MEMGETINFO: 416 info.type = mtd->type; 417 info.flags = mtd->flags; 418 info.size = mtd->size; 419 info.erasesize = mtd->erasesize; 420 info.writesize = mtd->writesize; 421 info.oobsize = mtd->oobsize; 422 /* The below fields are obsolete */ 423 info.ecctype = -1; 424 info.eccsize = 0; 425 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) 426 return -EFAULT; 427 break; 428 429 case MEMERASE: 430 { 431 struct erase_info *erase; 432 433 if(!(file->f_mode & 2)) 434 return -EPERM; 435 436 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); 437 if (!erase) 438 ret = -ENOMEM; 439 else { 440 wait_queue_head_t waitq; 441 DECLARE_WAITQUEUE(wait, current); 442 443 init_waitqueue_head(&waitq); 444 445 if (copy_from_user(&erase->addr, argp, 446 sizeof(struct erase_info_user))) { 447 kfree(erase); 448 return -EFAULT; 449 } 450 erase->mtd = mtd; 451 erase->callback = mtdchar_erase_callback; 452 erase->priv = (unsigned long)&waitq; 453 454 /* 455 FIXME: Allow INTERRUPTIBLE. Which means 456 not having the wait_queue head on the stack. 457 458 If the wq_head is on the stack, and we 459 leave because we got interrupted, then the 460 wq_head is no longer there when the 461 callback routine tries to wake us up. 462 */ 463 ret = mtd->erase(mtd, erase); 464 if (!ret) { 465 set_current_state(TASK_UNINTERRUPTIBLE); 466 add_wait_queue(&waitq, &wait); 467 if (erase->state != MTD_ERASE_DONE && 468 erase->state != MTD_ERASE_FAILED) 469 schedule(); 470 remove_wait_queue(&waitq, &wait); 471 set_current_state(TASK_RUNNING); 472 473 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; 474 } 475 kfree(erase); 476 } 477 break; 478 } 479 480 case MEMWRITEOOB: 481 { 482 struct mtd_oob_buf buf; 483 struct mtd_oob_ops ops; 484 485 if(!(file->f_mode & 2)) 486 return -EPERM; 487 488 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) 489 return -EFAULT; 490 491 if (buf.length > 4096) 492 return -EINVAL; 493 494 if (!mtd->write_oob) 495 ret = -EOPNOTSUPP; 496 else 497 ret = access_ok(VERIFY_READ, buf.ptr, 498 buf.length) ? 0 : EFAULT; 499 500 if (ret) 501 return ret; 502 503 ops.ooblen = buf.length; 504 ops.ooboffs = buf.start & (mtd->oobsize - 1); 505 ops.datbuf = NULL; 506 ops.mode = MTD_OOB_PLACE; 507 508 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) 509 return -EINVAL; 510 511 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); 512 if (!ops.oobbuf) 513 return -ENOMEM; 514 515 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) { 516 kfree(ops.oobbuf); 517 return -EFAULT; 518 } 519 520 buf.start &= ~(mtd->oobsize - 1); 521 ret = mtd->write_oob(mtd, buf.start, &ops); 522 523 if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen, 524 sizeof(uint32_t))) 525 ret = -EFAULT; 526 527 kfree(ops.oobbuf); 528 break; 529 530 } 531 532 case MEMREADOOB: 533 { 534 struct mtd_oob_buf buf; 535 struct mtd_oob_ops ops; 536 537 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) 538 return -EFAULT; 539 540 if (buf.length > 4096) 541 return -EINVAL; 542 543 if (!mtd->read_oob) 544 ret = -EOPNOTSUPP; 545 else 546 ret = access_ok(VERIFY_WRITE, buf.ptr, 547 buf.length) ? 0 : -EFAULT; 548 if (ret) 549 return ret; 550 551 ops.ooblen = buf.length; 552 ops.ooboffs = buf.start & (mtd->oobsize - 1); 553 ops.datbuf = NULL; 554 ops.mode = MTD_OOB_PLACE; 555 556 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) 557 return -EINVAL; 558 559 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); 560 if (!ops.oobbuf) 561 return -ENOMEM; 562 563 buf.start &= ~(mtd->oobsize - 1); 564 ret = mtd->read_oob(mtd, buf.start, &ops); 565 566 if (put_user(ops.oobretlen, (uint32_t __user *)argp)) 567 ret = -EFAULT; 568 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf, 569 ops.oobretlen)) 570 ret = -EFAULT; 571 572 kfree(ops.oobbuf); 573 break; 574 } 575 576 case MEMLOCK: 577 { 578 struct erase_info_user info; 579 580 if (copy_from_user(&info, argp, sizeof(info))) 581 return -EFAULT; 582 583 if (!mtd->lock) 584 ret = -EOPNOTSUPP; 585 else 586 ret = mtd->lock(mtd, info.start, info.length); 587 break; 588 } 589 590 case MEMUNLOCK: 591 { 592 struct erase_info_user info; 593 594 if (copy_from_user(&info, argp, sizeof(info))) 595 return -EFAULT; 596 597 if (!mtd->unlock) 598 ret = -EOPNOTSUPP; 599 else 600 ret = mtd->unlock(mtd, info.start, info.length); 601 break; 602 } 603 604 /* Legacy interface */ 605 case MEMGETOOBSEL: 606 { 607 struct nand_oobinfo oi; 608 609 if (!mtd->ecclayout) 610 return -EOPNOTSUPP; 611 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) 612 return -EINVAL; 613 614 oi.useecc = MTD_NANDECC_AUTOPLACE; 615 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); 616 memcpy(&oi.oobfree, mtd->ecclayout->oobfree, 617 sizeof(oi.oobfree)); 618 oi.eccbytes = mtd->ecclayout->eccbytes; 619 620 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) 621 return -EFAULT; 622 break; 623 } 624 625 case MEMGETBADBLOCK: 626 { 627 loff_t offs; 628 629 if (copy_from_user(&offs, argp, sizeof(loff_t))) 630 return -EFAULT; 631 if (!mtd->block_isbad) 632 ret = -EOPNOTSUPP; 633 else 634 return mtd->block_isbad(mtd, offs); 635 break; 636 } 637 638 case MEMSETBADBLOCK: 639 { 640 loff_t offs; 641 642 if (copy_from_user(&offs, argp, sizeof(loff_t))) 643 return -EFAULT; 644 if (!mtd->block_markbad) 645 ret = -EOPNOTSUPP; 646 else 647 return mtd->block_markbad(mtd, offs); 648 break; 649 } 650 651 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) 652 case OTPSELECT: 653 { 654 int mode; 655 if (copy_from_user(&mode, argp, sizeof(int))) 656 return -EFAULT; 657 658 mfi->mode = MTD_MODE_NORMAL; 659 660 ret = otp_select_filemode(mfi, mode); 661 662 file->f_pos = 0; 663 break; 664 } 665 666 case OTPGETREGIONCOUNT: 667 case OTPGETREGIONINFO: 668 { 669 struct otp_info *buf = kmalloc(4096, GFP_KERNEL); 670 if (!buf) 671 return -ENOMEM; 672 ret = -EOPNOTSUPP; 673 switch (mfi->mode) { 674 case MTD_MODE_OTP_FACTORY: 675 if (mtd->get_fact_prot_info) 676 ret = mtd->get_fact_prot_info(mtd, buf, 4096); 677 break; 678 case MTD_MODE_OTP_USER: 679 if (mtd->get_user_prot_info) 680 ret = mtd->get_user_prot_info(mtd, buf, 4096); 681 break; 682 default: 683 break; 684 } 685 if (ret >= 0) { 686 if (cmd == OTPGETREGIONCOUNT) { 687 int nbr = ret / sizeof(struct otp_info); 688 ret = copy_to_user(argp, &nbr, sizeof(int)); 689 } else 690 ret = copy_to_user(argp, buf, ret); 691 if (ret) 692 ret = -EFAULT; 693 } 694 kfree(buf); 695 break; 696 } 697 698 case OTPLOCK: 699 { 700 struct otp_info info; 701 702 if (mfi->mode != MTD_MODE_OTP_USER) 703 return -EINVAL; 704 if (copy_from_user(&info, argp, sizeof(info))) 705 return -EFAULT; 706 if (!mtd->lock_user_prot_reg) 707 return -EOPNOTSUPP; 708 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); 709 break; 710 } 711 #endif 712 713 case ECCGETLAYOUT: 714 { 715 if (!mtd->ecclayout) 716 return -EOPNOTSUPP; 717 718 if (copy_to_user(argp, mtd->ecclayout, 719 sizeof(struct nand_ecclayout))) 720 return -EFAULT; 721 break; 722 } 723 724 case ECCGETSTATS: 725 { 726 if (copy_to_user(argp, &mtd->ecc_stats, 727 sizeof(struct mtd_ecc_stats))) 728 return -EFAULT; 729 break; 730 } 731 732 case MTDFILEMODE: 733 { 734 mfi->mode = 0; 735 736 switch(arg) { 737 case MTD_MODE_OTP_FACTORY: 738 case MTD_MODE_OTP_USER: 739 ret = otp_select_filemode(mfi, arg); 740 break; 741 742 case MTD_MODE_RAW: 743 if (!mtd->read_oob || !mtd->write_oob) 744 return -EOPNOTSUPP; 745 mfi->mode = arg; 746 747 case MTD_MODE_NORMAL: 748 break; 749 default: 750 ret = -EINVAL; 751 } 752 file->f_pos = 0; 753 break; 754 } 755 756 default: 757 ret = -ENOTTY; 758 } 759 760 return ret; 761 } /* memory_ioctl */ 762 763 static const struct file_operations mtd_fops = { 764 .owner = THIS_MODULE, 765 .llseek = mtd_lseek, 766 .read = mtd_read, 767 .write = mtd_write, 768 .ioctl = mtd_ioctl, 769 .open = mtd_open, 770 .release = mtd_close, 771 }; 772 773 static int __init init_mtdchar(void) 774 { 775 if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { 776 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", 777 MTD_CHAR_MAJOR); 778 return -EAGAIN; 779 } 780 781 mtd_class = class_create(THIS_MODULE, "mtd"); 782 783 if (IS_ERR(mtd_class)) { 784 printk(KERN_ERR "Error creating mtd class.\n"); 785 unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); 786 return PTR_ERR(mtd_class); 787 } 788 789 register_mtd_user(¬ifier); 790 return 0; 791 } 792 793 static void __exit cleanup_mtdchar(void) 794 { 795 unregister_mtd_user(¬ifier); 796 class_destroy(mtd_class); 797 unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); 798 } 799 800 module_init(init_mtdchar); 801 module_exit(cleanup_mtdchar); 802 803 804 MODULE_LICENSE("GPL"); 805 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 806 MODULE_DESCRIPTION("Direct character-device access to MTD devices"); 807