?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ACPI: relax BAD_MADT_ENTRY check to allow LSAPIC variable length string UIDs
[linux-2.6/mini2440.git] / drivers / mtd / mtdchar.c
blobfb8b4f7e48d3a14a295f5661b9014908f1110dd4
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/uaccess.h>
20
21 static struct class *mtd_class;
22
23 static void mtd_notify_add(struct mtd_info* mtd)
24 {
25 if (!mtd)
26 return;
27
28 class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
29 NULL, "mtd%d", mtd->index);
30
31 class_device_create(mtd_class, NULL,
32 MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
33 NULL, "mtd%dro", mtd->index);
34 }
35
36 static void mtd_notify_remove(struct mtd_info* mtd)
37 {
38 if (!mtd)
39 return;
40
41 class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
42 class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
43 }
44
45 static struct mtd_notifier notifier = {
46 .add = mtd_notify_add,
47 .remove = mtd_notify_remove,
48 };
49
50 /*
51 * Data structure to hold the pointer to the mtd device as well
52 * as mode information ofr various use cases.
53 */
54 struct mtd_file_info {
55 struct mtd_info *mtd;
56 enum mtd_file_modes mode;
57 };
58
59 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
60 {
61 struct mtd_file_info *mfi = file->private_data;
62 struct mtd_info *mtd = mfi->mtd;
63
64 switch (orig) {
65 case 0:
66 /* SEEK_SET */
67 break;
68 case 1:
69 /* SEEK_CUR */
70 offset += file->f_pos;
71 break;
72 case 2:
73 /* SEEK_END */
74 offset += mtd->size;
75 break;
76 default:
77 return -EINVAL;
78 }
79
80 if (offset >= 0 && offset <= mtd->size)
81 return file->f_pos = offset;
82
83 return -EINVAL;
84 }
85
86
87
88 static int mtd_open(struct inode *inode, struct file *file)
89 {
90 int minor = iminor(inode);
91 int devnum = minor >> 1;
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 mtd = get_mtd_device(NULL, devnum);
105
106 if (!mtd)
107 return -ENODEV;
108
109 if (MTD_ABSENT == mtd->type) {
110 put_mtd_device(mtd);
111 return -ENODEV;
112 }
113
114 /* You can't open it RW if it's not a writeable device */
115 if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
116 put_mtd_device(mtd);
117 return -EACCES;
118 }
119
120 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
121 if (!mfi) {
122 put_mtd_device(mtd);
123 return -ENOMEM;
124 }
125 mfi->mtd = mtd;
126 file->private_data = mfi;
127
128 return 0;
129 } /* mtd_open */
130
131 /*====================================================================*/
132
133 static int mtd_close(struct inode *inode, struct file *file)
134 {
135 struct mtd_file_info *mfi = file->private_data;
136 struct mtd_info *mtd = mfi->mtd;
137
138 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
139
140 if (mtd->sync)
141 mtd->sync(mtd);
142
143 put_mtd_device(mtd);
144 file->private_data = NULL;
145 kfree(mfi);
146
147 return 0;
148 } /* mtd_close */
149
150 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
151 userspace buffer down and use it directly with readv/writev.
152 */
153 #define MAX_KMALLOC_SIZE 0x20000
154
155 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
156 {
157 struct mtd_file_info *mfi = file->private_data;
158 struct mtd_info *mtd = mfi->mtd;
159 size_t retlen=0;
160 size_t total_retlen=0;
161 int ret=0;
162 int len;
163 char *kbuf;
164
165 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
166
167 if (*ppos + count > mtd->size)
168 count = mtd->size - *ppos;
169
170 if (!count)
171 return 0;
172
173 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
174 and pass them directly to the MTD functions */
175
176 if (count > MAX_KMALLOC_SIZE)
177 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
178 else
179 kbuf=kmalloc(count, GFP_KERNEL);
180
181 if (!kbuf)
182 return -ENOMEM;
183
184 while (count) {
185
186 if (count > MAX_KMALLOC_SIZE)
187 len = MAX_KMALLOC_SIZE;
188 else
189 len = count;
190
191 switch (mfi->mode) {
192 case MTD_MODE_OTP_FACTORY:
193 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
194 break;
195 case MTD_MODE_OTP_USER:
196 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
197 break;
198 case MTD_MODE_RAW:
199 {
200 struct mtd_oob_ops ops;
201
202 ops.mode = MTD_OOB_RAW;
203 ops.datbuf = kbuf;
204 ops.oobbuf = NULL;
205 ops.len = len;
206
207 ret = mtd->read_oob(mtd, *ppos, &ops);
208 retlen = ops.retlen;
209 break;
210 }
211 default:
212 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
213 }
214 /* Nand returns -EBADMSG on ecc errors, but it returns
215 * the data. For our userspace tools it is important
216 * to dump areas with ecc errors !
217 * For kernel internal usage it also might return -EUCLEAN
218 * to signal the caller that a bitflip has occured and has
219 * been corrected by the ECC algorithm.
220 * Userspace software which accesses NAND this way
221 * must be aware of the fact that it deals with NAND
222 */
223 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
224 *ppos += retlen;
225 if (copy_to_user(buf, kbuf, retlen)) {
226 kfree(kbuf);
227 return -EFAULT;
228 }
229 else
230 total_retlen += retlen;
231
232 count -= retlen;
233 buf += retlen;
234 if (retlen == 0)
235 count = 0;
236 }
237 else {
238 kfree(kbuf);
239 return ret;
240 }
241
242 }
243
244 kfree(kbuf);
245 return total_retlen;
246 } /* mtd_read */
247
248 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
249 {
250 struct mtd_file_info *mfi = file->private_data;
251 struct mtd_info *mtd = mfi->mtd;
252 char *kbuf;
253 size_t retlen;
254 size_t total_retlen=0;
255 int ret=0;
256 int len;
257
258 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
259
260 if (*ppos == mtd->size)
261 return -ENOSPC;
262
263 if (*ppos + count > mtd->size)
264 count = mtd->size - *ppos;
265
266 if (!count)
267 return 0;
268
269 if (count > MAX_KMALLOC_SIZE)
270 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
271 else
272 kbuf=kmalloc(count, GFP_KERNEL);
273
274 if (!kbuf)
275 return -ENOMEM;
276
277 while (count) {
278
279 if (count > MAX_KMALLOC_SIZE)
280 len = MAX_KMALLOC_SIZE;
281 else
282 len = count;
283
284 if (copy_from_user(kbuf, buf, len)) {
285 kfree(kbuf);
286 return -EFAULT;
287 }
288
289 switch (mfi->mode) {
290 case MTD_MODE_OTP_FACTORY:
291 ret = -EROFS;
292 break;
293 case MTD_MODE_OTP_USER:
294 if (!mtd->write_user_prot_reg) {
295 ret = -EOPNOTSUPP;
296 break;
297 }
298 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
299 break;
300
301 case MTD_MODE_RAW:
302 {
303 struct mtd_oob_ops ops;
304
305 ops.mode = MTD_OOB_RAW;
306 ops.datbuf = kbuf;
307 ops.oobbuf = NULL;
308 ops.len = len;
309
310 ret = mtd->write_oob(mtd, *ppos, &ops);
311 retlen = ops.retlen;
312 break;
313 }
314
315 default:
316 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
317 }
318 if (!ret) {
319 *ppos += retlen;
320 total_retlen += retlen;
321 count -= retlen;
322 buf += retlen;
323 }
324 else {
325 kfree(kbuf);
326 return ret;
327 }
328 }
329
330 kfree(kbuf);
331 return total_retlen;
332 } /* mtd_write */
333
334 /*======================================================================
335
336 IOCTL calls for getting device parameters.
337
338 ======================================================================*/
339 static void mtdchar_erase_callback (struct erase_info *instr)
340 {
341 wake_up((wait_queue_head_t *)instr->priv);
342 }
343
344 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
345 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
346 {
347 struct mtd_info *mtd = mfi->mtd;
348 int ret = 0;
349
350 switch (mode) {
351 case MTD_OTP_FACTORY:
352 if (!mtd->read_fact_prot_reg)
353 ret = -EOPNOTSUPP;
354 else
355 mfi->mode = MTD_MODE_OTP_FACTORY;
356 break;
357 case MTD_OTP_USER:
358 if (!mtd->read_fact_prot_reg)
359 ret = -EOPNOTSUPP;
360 else
361 mfi->mode = MTD_MODE_OTP_USER;
362 break;
363 default:
364 ret = -EINVAL;
365 case MTD_OTP_OFF:
366 break;
367 }
368 return ret;
369 }
370 #else
371 # define otp_select_filemode(f,m) -EOPNOTSUPP
372 #endif
373
374 static int mtd_ioctl(struct inode *inode, struct file *file,
375 u_int cmd, u_long arg)
376 {
377 struct mtd_file_info *mfi = file->private_data;
378 struct mtd_info *mtd = mfi->mtd;
379 void __user *argp = (void __user *)arg;
380 int ret = 0;
381 u_long size;
382 struct mtd_info_user info;
383
384 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
385
386 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
387 if (cmd & IOC_IN) {
388 if (!access_ok(VERIFY_READ, argp, size))
389 return -EFAULT;
390 }
391 if (cmd & IOC_OUT) {
392 if (!access_ok(VERIFY_WRITE, argp, size))
393 return -EFAULT;
394 }
395
396 switch (cmd) {
397 case MEMGETREGIONCOUNT:
398 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
399 return -EFAULT;
400 break;
401
402 case MEMGETREGIONINFO:
403 {
404 struct region_info_user ur;
405
406 if (copy_from_user(&ur, argp, sizeof(struct region_info_user)))
407 return -EFAULT;
408
409 if (ur.regionindex >= mtd->numeraseregions)
410 return -EINVAL;
411 if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]),
412 sizeof(struct mtd_erase_region_info)))
413 return -EFAULT;
414 break;
415 }
416
417 case MEMGETINFO:
418 info.type = mtd->type;
419 info.flags = mtd->flags;
420 info.size = mtd->size;
421 info.erasesize = mtd->erasesize;
422 info.writesize = mtd->writesize;
423 info.oobsize = mtd->oobsize;
424 info.ecctype = mtd->ecctype;
425 info.eccsize = mtd->eccsize;
426 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
427 return -EFAULT;
428 break;
429
430 case MEMERASE:
431 {
432 struct erase_info *erase;
433
434 if(!(file->f_mode & 2))
435 return -EPERM;
436
437 erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL);
438 if (!erase)
439 ret = -ENOMEM;
440 else {
441 wait_queue_head_t waitq;
442 DECLARE_WAITQUEUE(wait, current);
443
444 init_waitqueue_head(&waitq);
445
446 memset (erase,0,sizeof(struct erase_info));
447 if (copy_from_user(&erase->addr, argp,
448 sizeof(struct erase_info_user))) {
449 kfree(erase);
450 return -EFAULT;
451 }
452 erase->mtd = mtd;
453 erase->callback = mtdchar_erase_callback;
454 erase->priv = (unsigned long)&waitq;
455
456 /*
457 FIXME: Allow INTERRUPTIBLE. Which means
458 not having the wait_queue head on the stack.
459
460 If the wq_head is on the stack, and we
461 leave because we got interrupted, then the
462 wq_head is no longer there when the
463 callback routine tries to wake us up.
464 */
465 ret = mtd->erase(mtd, erase);
466 if (!ret) {
467 set_current_state(TASK_UNINTERRUPTIBLE);
468 add_wait_queue(&waitq, &wait);
469 if (erase->state != MTD_ERASE_DONE &&
470 erase->state != MTD_ERASE_FAILED)
471 schedule();
472 remove_wait_queue(&waitq, &wait);
473 set_current_state(TASK_RUNNING);
474
475 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
476 }
477 kfree(erase);
478 }
479 break;
480 }
481
482 case MEMWRITEOOB:
483 {
484 struct mtd_oob_buf buf;
485 struct mtd_oob_ops ops;
486
487 if(!(file->f_mode & 2))
488 return -EPERM;
489
490 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
491 return -EFAULT;
492
493 if (buf.length > 4096)
494 return -EINVAL;
495
496 if (!mtd->write_oob)
497 ret = -EOPNOTSUPP;
498 else
499 ret = access_ok(VERIFY_READ, buf.ptr,
500 buf.length) ? 0 : EFAULT;
501
502 if (ret)
503 return ret;
504
505 ops.len = buf.length;
506 ops.ooblen = buf.length;
507 ops.ooboffs = buf.start & (mtd->oobsize - 1);
508 ops.datbuf = NULL;
509 ops.mode = MTD_OOB_PLACE;
510
511 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
512 return -EINVAL;
513
514 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
515 if (!ops.oobbuf)
516 return -ENOMEM;
517
518 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
519 kfree(ops.oobbuf);
520 return -EFAULT;
521 }
522
523 buf.start &= ~(mtd->oobsize - 1);
524 ret = mtd->write_oob(mtd, buf.start, &ops);
525
526 if (copy_to_user(argp + sizeof(uint32_t), &ops.retlen,
527 sizeof(uint32_t)))
528 ret = -EFAULT;
529
530 kfree(ops.oobbuf);
531 break;
532
533 }
534
535 case MEMREADOOB:
536 {
537 struct mtd_oob_buf buf;
538 struct mtd_oob_ops ops;
539
540 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
541 return -EFAULT;
542
543 if (buf.length > 4096)
544 return -EINVAL;
545
546 if (!mtd->read_oob)
547 ret = -EOPNOTSUPP;
548 else
549 ret = access_ok(VERIFY_WRITE, buf.ptr,
550 buf.length) ? 0 : -EFAULT;
551 if (ret)
552 return ret;
553
554 ops.len = buf.length;
555 ops.ooblen = buf.length;
556 ops.ooboffs = buf.start & (mtd->oobsize - 1);
557 ops.datbuf = NULL;
558 ops.mode = MTD_OOB_PLACE;
559
560 if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs))
561 return -EINVAL;
562
563 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
564 if (!ops.oobbuf)
565 return -ENOMEM;
566
567 buf.start &= ~(mtd->oobsize - 1);
568 ret = mtd->read_oob(mtd, buf.start, &ops);
569
570 if (put_user(ops.retlen, (uint32_t __user *)argp))
571 ret = -EFAULT;
572 else if (ops.retlen && copy_to_user(buf.ptr, ops.oobbuf,
573 ops.retlen))
574 ret = -EFAULT;
575
576 kfree(ops.oobbuf);
577 break;
578 }
579
580 case MEMLOCK:
581 {
582 struct erase_info_user info;
583
584 if (copy_from_user(&info, argp, sizeof(info)))
585 return -EFAULT;
586
587 if (!mtd->lock)
588 ret = -EOPNOTSUPP;
589 else
590 ret = mtd->lock(mtd, info.start, info.length);
591 break;
592 }
593
594 case MEMUNLOCK:
595 {
596 struct erase_info_user info;
597
598 if (copy_from_user(&info, argp, sizeof(info)))
599 return -EFAULT;
600
601 if (!mtd->unlock)
602 ret = -EOPNOTSUPP;
603 else
604 ret = mtd->unlock(mtd, info.start, info.length);
605 break;
606 }
607
608 /* Legacy interface */
609 case MEMGETOOBSEL:
610 {
611 struct nand_oobinfo oi;
612
613 if (!mtd->ecclayout)
614 return -EOPNOTSUPP;
615 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
616 return -EINVAL;
617
618 oi.useecc = MTD_NANDECC_AUTOPLACE;
619 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
620 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
621 sizeof(oi.oobfree));
622
623 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
624 return -EFAULT;
625 break;
626 }
627
628 case MEMGETBADBLOCK:
629 {
630 loff_t offs;
631
632 if (copy_from_user(&offs, argp, sizeof(loff_t)))
633 return -EFAULT;
634 if (!mtd->block_isbad)
635 ret = -EOPNOTSUPP;
636 else
637 return mtd->block_isbad(mtd, offs);
638 break;
639 }
640
641 case MEMSETBADBLOCK:
642 {
643 loff_t offs;
644
645 if (copy_from_user(&offs, argp, sizeof(loff_t)))
646 return -EFAULT;
647 if (!mtd->block_markbad)
648 ret = -EOPNOTSUPP;
649 else
650 return mtd->block_markbad(mtd, offs);
651 break;
652 }
653
654 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
655 case OTPSELECT:
656 {
657 int mode;
658 if (copy_from_user(&mode, argp, sizeof(int)))
659 return -EFAULT;
660
661 mfi->mode = MTD_MODE_NORMAL;
662
663 ret = otp_select_filemode(mfi, mode);
664
665 file->f_pos = 0;
666 break;
667 }
668
669 case OTPGETREGIONCOUNT:
670 case OTPGETREGIONINFO:
671 {
672 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
673 if (!buf)
674 return -ENOMEM;
675 ret = -EOPNOTSUPP;
676 switch (mfi->mode) {
677 case MTD_MODE_OTP_FACTORY:
678 if (mtd->get_fact_prot_info)
679 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
680 break;
681 case MTD_MODE_OTP_USER:
682 if (mtd->get_user_prot_info)
683 ret = mtd->get_user_prot_info(mtd, buf, 4096);
684 break;
685 default:
686 break;
687 }
688 if (ret >= 0) {
689 if (cmd == OTPGETREGIONCOUNT) {
690 int nbr = ret / sizeof(struct otp_info);
691 ret = copy_to_user(argp, &nbr, sizeof(int));
692 } else
693 ret = copy_to_user(argp, buf, ret);
694 if (ret)
695 ret = -EFAULT;
696 }
697 kfree(buf);
698 break;
699 }
700
701 case OTPLOCK:
702 {
703 struct otp_info info;
704
705 if (mfi->mode != MTD_MODE_OTP_USER)
706 return -EINVAL;
707 if (copy_from_user(&info, argp, sizeof(info)))
708 return -EFAULT;
709 if (!mtd->lock_user_prot_reg)
710 return -EOPNOTSUPP;
711 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
712 break;
713 }
714 #endif
715
716 case ECCGETLAYOUT:
717 {
718 if (!mtd->ecclayout)
719 return -EOPNOTSUPP;
720
721 if (copy_to_user(argp, &mtd->ecclayout,
722 sizeof(struct nand_ecclayout)))
723 return -EFAULT;
724 break;
725 }
726
727 case ECCGETSTATS:
728 {
729 if (copy_to_user(argp, &mtd->ecc_stats,
730 sizeof(struct mtd_ecc_stats)))
731 return -EFAULT;
732 break;
733 }
734
735 case MTDFILEMODE:
736 {
737 mfi->mode = 0;
738
739 switch(arg) {
740 case MTD_MODE_OTP_FACTORY:
741 case MTD_MODE_OTP_USER:
742 ret = otp_select_filemode(mfi, arg);
743 break;
744
745 case MTD_MODE_RAW:
746 if (!mtd->read_oob || !mtd->write_oob)
747 return -EOPNOTSUPP;
748 mfi->mode = arg;
749
750 case MTD_MODE_NORMAL:
751 break;
752 default:
753 ret = -EINVAL;
754 }
755 file->f_pos = 0;
756 break;
757 }
758
759 default:
760 ret = -ENOTTY;
761 }
762
763 return ret;
764 } /* memory_ioctl */
765
766 static struct file_operations mtd_fops = {
767 .owner = THIS_MODULE,
768 .llseek = mtd_lseek,
769 .read = mtd_read,
770 .write = mtd_write,
771 .ioctl = mtd_ioctl,
772 .open = mtd_open,
773 .release = mtd_close,
774 };
775
776 static int __init init_mtdchar(void)
777 {
778 if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
779 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
780 MTD_CHAR_MAJOR);
781 return -EAGAIN;
782 }
783
784 mtd_class = class_create(THIS_MODULE, "mtd");
785
786 if (IS_ERR(mtd_class)) {
787 printk(KERN_ERR "Error creating mtd class.\n");
788 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
789 return PTR_ERR(mtd_class);
790 }
791
792 register_mtd_user(&notifier);
793 return 0;
794 }
795
796 static void __exit cleanup_mtdchar(void)
797 {
798 unregister_mtd_user(&notifier);
799 class_destroy(mtd_class);
800 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
801 }
802
803 module_init(init_mtdchar);
804 module_exit(cleanup_mtdchar);
805
806
807 MODULE_LICENSE("GPL");
808 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
809 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
Support for the Chinese Samsung S3C2440 based development boards