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pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / mtd / mtdchar.c
blob22ed96c4b7bd75a7bedd4a9936f78f9094a7a95a
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/mm.h>
11 #include <linux/err.h>
12 #include <linux/init.h>
13 #include <linux/kernel.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/sched.h>
17
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/compatmac.h>
20
21 #include <asm/uaccess.h>
22
23 static struct class *mtd_class;
24
25 static void mtd_notify_add(struct mtd_info* mtd)
26 {
27 if (!mtd)
28 return;
29
30 class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
31 NULL, "mtd%d", mtd->index);
32
33 class_device_create(mtd_class, NULL,
34 MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1),
35 NULL, "mtd%dro", mtd->index);
36 }
37
38 static void mtd_notify_remove(struct mtd_info* mtd)
39 {
40 if (!mtd)
41 return;
42
43 class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
44 class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1));
45 }
46
47 static struct mtd_notifier notifier = {
48 .add = mtd_notify_add,
49 .remove = mtd_notify_remove,
50 };
51
52 /*
53 * Data structure to hold the pointer to the mtd device as well
54 * as mode information ofr various use cases.
55 */
56 struct mtd_file_info {
57 struct mtd_info *mtd;
58 enum mtd_file_modes mode;
59 };
60
61 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
62 {
63 struct mtd_file_info *mfi = file->private_data;
64 struct mtd_info *mtd = mfi->mtd;
65
66 switch (orig) {
67 case SEEK_SET:
68 break;
69 case SEEK_CUR:
70 offset += file->f_pos;
71 break;
72 case SEEK_END:
73 offset += mtd->size;
74 break;
75 default:
76 return -EINVAL;
77 }
78
79 if (offset >= 0 && offset <= mtd->size)
80 return file->f_pos = offset;
81
82 return -EINVAL;
83 }
84
85
86
87 static int mtd_open(struct inode *inode, struct file *file)
88 {
89 int minor = iminor(inode);
90 int devnum = minor >> 1;
91 struct mtd_info *mtd;
92 struct mtd_file_info *mfi;
93
94 DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
95
96 if (devnum >= MAX_MTD_DEVICES)
97 return -ENODEV;
98
99 /* You can't open the RO devices RW */
100 if ((file->f_mode & 2) && (minor & 1))
101 return -EACCES;
102
103 mtd = get_mtd_device(NULL, devnum);
104
105 if (IS_ERR(mtd))
106 return PTR_ERR(mtd);
107
108 if (MTD_ABSENT == mtd->type) {
109 put_mtd_device(mtd);
110 return -ENODEV;
111 }
112
113 /* You can't open it RW if it's not a writeable device */
114 if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
115 put_mtd_device(mtd);
116 return -EACCES;
117 }
118
119 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
120 if (!mfi) {
121 put_mtd_device(mtd);
122 return -ENOMEM;
123 }
124 mfi->mtd = mtd;
125 file->private_data = mfi;
126
127 return 0;
128 } /* mtd_open */
129
130 /*====================================================================*/
131
132 static int mtd_close(struct inode *inode, struct file *file)
133 {
134 struct mtd_file_info *mfi = file->private_data;
135 struct mtd_info *mtd = mfi->mtd;
136
137 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
138
139 /* Only sync if opened RW */
140 if ((file->f_mode & 2) && 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 /* The below fields are obsolete */
425 info.ecctype = -1;
426 info.eccsize = 0;
427 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
428 return -EFAULT;
429 break;
430
431 case MEMERASE:
432 {
433 struct erase_info *erase;
434
435 if(!(file->f_mode & 2))
436 return -EPERM;
437
438 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
439 if (!erase)
440 ret = -ENOMEM;
441 else {
442 wait_queue_head_t waitq;
443 DECLARE_WAITQUEUE(wait, current);
444
445 init_waitqueue_head(&waitq);
446
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.ooblen = buf.length;
506 ops.ooboffs = buf.start & (mtd->oobsize - 1);
507 ops.datbuf = NULL;
508 ops.mode = MTD_OOB_PLACE;
509
510 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
511 return -EINVAL;
512
513 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
514 if (!ops.oobbuf)
515 return -ENOMEM;
516
517 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
518 kfree(ops.oobbuf);
519 return -EFAULT;
520 }
521
522 buf.start &= ~(mtd->oobsize - 1);
523 ret = mtd->write_oob(mtd, buf.start, &ops);
524
525 if (copy_to_user(argp + sizeof(uint32_t), &ops.oobretlen,
526 sizeof(uint32_t)))
527 ret = -EFAULT;
528
529 kfree(ops.oobbuf);
530 break;
531
532 }
533
534 case MEMREADOOB:
535 {
536 struct mtd_oob_buf buf;
537 struct mtd_oob_ops ops;
538
539 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
540 return -EFAULT;
541
542 if (buf.length > 4096)
543 return -EINVAL;
544
545 if (!mtd->read_oob)
546 ret = -EOPNOTSUPP;
547 else
548 ret = access_ok(VERIFY_WRITE, buf.ptr,
549 buf.length) ? 0 : -EFAULT;
550 if (ret)
551 return ret;
552
553 ops.ooblen = buf.length;
554 ops.ooboffs = buf.start & (mtd->oobsize - 1);
555 ops.datbuf = NULL;
556 ops.mode = MTD_OOB_PLACE;
557
558 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
559 return -EINVAL;
560
561 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
562 if (!ops.oobbuf)
563 return -ENOMEM;
564
565 buf.start &= ~(mtd->oobsize - 1);
566 ret = mtd->read_oob(mtd, buf.start, &ops);
567
568 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
569 ret = -EFAULT;
570 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
571 ops.oobretlen))
572 ret = -EFAULT;
573
574 kfree(ops.oobbuf);
575 break;
576 }
577
578 case MEMLOCK:
579 {
580 struct erase_info_user info;
581
582 if (copy_from_user(&info, argp, sizeof(info)))
583 return -EFAULT;
584
585 if (!mtd->lock)
586 ret = -EOPNOTSUPP;
587 else
588 ret = mtd->lock(mtd, info.start, info.length);
589 break;
590 }
591
592 case MEMUNLOCK:
593 {
594 struct erase_info_user info;
595
596 if (copy_from_user(&info, argp, sizeof(info)))
597 return -EFAULT;
598
599 if (!mtd->unlock)
600 ret = -EOPNOTSUPP;
601 else
602 ret = mtd->unlock(mtd, info.start, info.length);
603 break;
604 }
605
606 /* Legacy interface */
607 case MEMGETOOBSEL:
608 {
609 struct nand_oobinfo oi;
610
611 if (!mtd->ecclayout)
612 return -EOPNOTSUPP;
613 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
614 return -EINVAL;
615
616 oi.useecc = MTD_NANDECC_AUTOPLACE;
617 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
618 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
619 sizeof(oi.oobfree));
620 oi.eccbytes = mtd->ecclayout->eccbytes;
621
622 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
623 return -EFAULT;
624 break;
625 }
626
627 case MEMGETBADBLOCK:
628 {
629 loff_t offs;
630
631 if (copy_from_user(&offs, argp, sizeof(loff_t)))
632 return -EFAULT;
633 if (!mtd->block_isbad)
634 ret = -EOPNOTSUPP;
635 else
636 return mtd->block_isbad(mtd, offs);
637 break;
638 }
639
640 case MEMSETBADBLOCK:
641 {
642 loff_t offs;
643
644 if (copy_from_user(&offs, argp, sizeof(loff_t)))
645 return -EFAULT;
646 if (!mtd->block_markbad)
647 ret = -EOPNOTSUPP;
648 else
649 return mtd->block_markbad(mtd, offs);
650 break;
651 }
652
653 #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP)
654 case OTPSELECT:
655 {
656 int mode;
657 if (copy_from_user(&mode, argp, sizeof(int)))
658 return -EFAULT;
659
660 mfi->mode = MTD_MODE_NORMAL;
661
662 ret = otp_select_filemode(mfi, mode);
663
664 file->f_pos = 0;
665 break;
666 }
667
668 case OTPGETREGIONCOUNT:
669 case OTPGETREGIONINFO:
670 {
671 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
672 if (!buf)
673 return -ENOMEM;
674 ret = -EOPNOTSUPP;
675 switch (mfi->mode) {
676 case MTD_MODE_OTP_FACTORY:
677 if (mtd->get_fact_prot_info)
678 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
679 break;
680 case MTD_MODE_OTP_USER:
681 if (mtd->get_user_prot_info)
682 ret = mtd->get_user_prot_info(mtd, buf, 4096);
683 break;
684 default:
685 break;
686 }
687 if (ret >= 0) {
688 if (cmd == OTPGETREGIONCOUNT) {
689 int nbr = ret / sizeof(struct otp_info);
690 ret = copy_to_user(argp, &nbr, sizeof(int));
691 } else
692 ret = copy_to_user(argp, buf, ret);
693 if (ret)
694 ret = -EFAULT;
695 }
696 kfree(buf);
697 break;
698 }
699
700 case OTPLOCK:
701 {
702 struct otp_info info;
703
704 if (mfi->mode != MTD_MODE_OTP_USER)
705 return -EINVAL;
706 if (copy_from_user(&info, argp, sizeof(info)))
707 return -EFAULT;
708 if (!mtd->lock_user_prot_reg)
709 return -EOPNOTSUPP;
710 ret = mtd->lock_user_prot_reg(mtd, info.start, info.length);
711 break;
712 }
713 #endif
714
715 case ECCGETLAYOUT:
716 {
717 if (!mtd->ecclayout)
718 return -EOPNOTSUPP;
719
720 if (copy_to_user(argp, mtd->ecclayout,
721 sizeof(struct nand_ecclayout)))
722 return -EFAULT;
723 break;
724 }
725
726 case ECCGETSTATS:
727 {
728 if (copy_to_user(argp, &mtd->ecc_stats,
729 sizeof(struct mtd_ecc_stats)))
730 return -EFAULT;
731 break;
732 }
733
734 case MTDFILEMODE:
735 {
736 mfi->mode = 0;
737
738 switch(arg) {
739 case MTD_MODE_OTP_FACTORY:
740 case MTD_MODE_OTP_USER:
741 ret = otp_select_filemode(mfi, arg);
742 break;
743
744 case MTD_MODE_RAW:
745 if (!mtd->read_oob || !mtd->write_oob)
746 return -EOPNOTSUPP;
747 mfi->mode = arg;
748
749 case MTD_MODE_NORMAL:
750 break;
751 default:
752 ret = -EINVAL;
753 }
754 file->f_pos = 0;
755 break;
756 }
757
758 default:
759 ret = -ENOTTY;
760 }
761
762 return ret;
763 } /* memory_ioctl */
764
765 static const struct file_operations mtd_fops = {
766 .owner = THIS_MODULE,
767 .llseek = mtd_lseek,
768 .read = mtd_read,
769 .write = mtd_write,
770 .ioctl = mtd_ioctl,
771 .open = mtd_open,
772 .release = mtd_close,
773 };
774
775 static int __init init_mtdchar(void)
776 {
777 if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
778 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
779 MTD_CHAR_MAJOR);
780 return -EAGAIN;
781 }
782
783 mtd_class = class_create(THIS_MODULE, "mtd");
784
785 if (IS_ERR(mtd_class)) {
786 printk(KERN_ERR "Error creating mtd class.\n");
787 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
788 return PTR_ERR(mtd_class);
789 }
790
791 register_mtd_user(&notifier);
792 return 0;
793 }
794
795 static void __exit cleanup_mtdchar(void)
796 {
797 unregister_mtd_user(&notifier);
798 class_destroy(mtd_class);
799 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
800 }
801
802 module_init(init_mtdchar);
803 module_exit(cleanup_mtdchar);
804
805
806 MODULE_LICENSE("GPL");
807 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
808 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
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