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PCI: pcie_portdriver: fix pcie_port_device_remove
[linux-2.6/mini2440.git] / drivers / mtd / mtdchar.c
blobe9ec59e9a566ab2a7560e9a166cfaa506077703f
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
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 device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2),
30 NULL, "mtd%d", mtd->index);
31
32 device_create(mtd_class, NULL, 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 device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2));
42 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 SEEK_SET:
66 break;
67 case SEEK_CUR:
68 offset += file->f_pos;
69 break;
70 case SEEK_END:
71 offset += mtd->size;
72 break;
73 default:
74 return -EINVAL;
75 }
76
77 if (offset >= 0 && offset <= mtd->size)
78 return file->f_pos = offset;
79
80 return -EINVAL;
81 }
82
83
84
85 static int mtd_open(struct inode *inode, struct file *file)
86 {
87 int minor = iminor(inode);
88 int devnum = minor >> 1;
89 int ret = 0;
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 & FMODE_WRITE) && (minor & 1))
100 return -EACCES;
101
102 lock_kernel();
103 mtd = get_mtd_device(NULL, devnum);
104
105 if (IS_ERR(mtd)) {
106 ret = PTR_ERR(mtd);
107 goto out;
108 }
109
110 if (MTD_ABSENT == mtd->type) {
111 put_mtd_device(mtd);
112 ret = -ENODEV;
113 goto out;
114 }
115
116 /* You can't open it RW if it's not a writeable device */
117 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
118 put_mtd_device(mtd);
119 ret = -EACCES;
120 goto out;
121 }
122
123 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
124 if (!mfi) {
125 put_mtd_device(mtd);
126 ret = -ENOMEM;
127 goto out;
128 }
129 mfi->mtd = mtd;
130 file->private_data = mfi;
131
132 out:
133 unlock_kernel();
134 return ret;
135 } /* mtd_open */
136
137 /*====================================================================*/
138
139 static int mtd_close(struct inode *inode, struct file *file)
140 {
141 struct mtd_file_info *mfi = file->private_data;
142 struct mtd_info *mtd = mfi->mtd;
143
144 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
145
146 /* Only sync if opened RW */
147 if ((file->f_mode & FMODE_WRITE) && mtd->sync)
148 mtd->sync(mtd);
149
150 put_mtd_device(mtd);
151 file->private_data = NULL;
152 kfree(mfi);
153
154 return 0;
155 } /* mtd_close */
156
157 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
158 userspace buffer down and use it directly with readv/writev.
159 */
160 #define MAX_KMALLOC_SIZE 0x20000
161
162 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
163 {
164 struct mtd_file_info *mfi = file->private_data;
165 struct mtd_info *mtd = mfi->mtd;
166 size_t retlen=0;
167 size_t total_retlen=0;
168 int ret=0;
169 int len;
170 char *kbuf;
171
172 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
173
174 if (*ppos + count > mtd->size)
175 count = mtd->size - *ppos;
176
177 if (!count)
178 return 0;
179
180 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
181 and pass them directly to the MTD functions */
182
183 if (count > MAX_KMALLOC_SIZE)
184 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
185 else
186 kbuf=kmalloc(count, GFP_KERNEL);
187
188 if (!kbuf)
189 return -ENOMEM;
190
191 while (count) {
192
193 if (count > MAX_KMALLOC_SIZE)
194 len = MAX_KMALLOC_SIZE;
195 else
196 len = count;
197
198 switch (mfi->mode) {
199 case MTD_MODE_OTP_FACTORY:
200 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
201 break;
202 case MTD_MODE_OTP_USER:
203 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
204 break;
205 case MTD_MODE_RAW:
206 {
207 struct mtd_oob_ops ops;
208
209 ops.mode = MTD_OOB_RAW;
210 ops.datbuf = kbuf;
211 ops.oobbuf = NULL;
212 ops.len = len;
213
214 ret = mtd->read_oob(mtd, *ppos, &ops);
215 retlen = ops.retlen;
216 break;
217 }
218 default:
219 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
220 }
221 /* Nand returns -EBADMSG on ecc errors, but it returns
222 * the data. For our userspace tools it is important
223 * to dump areas with ecc errors !
224 * For kernel internal usage it also might return -EUCLEAN
225 * to signal the caller that a bitflip has occured and has
226 * been corrected by the ECC algorithm.
227 * Userspace software which accesses NAND this way
228 * must be aware of the fact that it deals with NAND
229 */
230 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
231 *ppos += retlen;
232 if (copy_to_user(buf, kbuf, retlen)) {
233 kfree(kbuf);
234 return -EFAULT;
235 }
236 else
237 total_retlen += retlen;
238
239 count -= retlen;
240 buf += retlen;
241 if (retlen == 0)
242 count = 0;
243 }
244 else {
245 kfree(kbuf);
246 return ret;
247 }
248
249 }
250
251 kfree(kbuf);
252 return total_retlen;
253 } /* mtd_read */
254
255 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
256 {
257 struct mtd_file_info *mfi = file->private_data;
258 struct mtd_info *mtd = mfi->mtd;
259 char *kbuf;
260 size_t retlen;
261 size_t total_retlen=0;
262 int ret=0;
263 int len;
264
265 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
266
267 if (*ppos == mtd->size)
268 return -ENOSPC;
269
270 if (*ppos + count > mtd->size)
271 count = mtd->size - *ppos;
272
273 if (!count)
274 return 0;
275
276 if (count > MAX_KMALLOC_SIZE)
277 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
278 else
279 kbuf=kmalloc(count, GFP_KERNEL);
280
281 if (!kbuf)
282 return -ENOMEM;
283
284 while (count) {
285
286 if (count > MAX_KMALLOC_SIZE)
287 len = MAX_KMALLOC_SIZE;
288 else
289 len = count;
290
291 if (copy_from_user(kbuf, buf, len)) {
292 kfree(kbuf);
293 return -EFAULT;
294 }
295
296 switch (mfi->mode) {
297 case MTD_MODE_OTP_FACTORY:
298 ret = -EROFS;
299 break;
300 case MTD_MODE_OTP_USER:
301 if (!mtd->write_user_prot_reg) {
302 ret = -EOPNOTSUPP;
303 break;
304 }
305 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
306 break;
307
308 case MTD_MODE_RAW:
309 {
310 struct mtd_oob_ops ops;
311
312 ops.mode = MTD_OOB_RAW;
313 ops.datbuf = kbuf;
314 ops.oobbuf = NULL;
315 ops.len = len;
316
317 ret = mtd->write_oob(mtd, *ppos, &ops);
318 retlen = ops.retlen;
319 break;
320 }
321
322 default:
323 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
324 }
325 if (!ret) {
326 *ppos += retlen;
327 total_retlen += retlen;
328 count -= retlen;
329 buf += retlen;
330 }
331 else {
332 kfree(kbuf);
333 return ret;
334 }
335 }
336
337 kfree(kbuf);
338 return total_retlen;
339 } /* mtd_write */
340
341 /*======================================================================
342
343 IOCTL calls for getting device parameters.
344
345 ======================================================================*/
346 static void mtdchar_erase_callback (struct erase_info *instr)
347 {
348 wake_up((wait_queue_head_t *)instr->priv);
349 }
350
351 #ifdef CONFIG_HAVE_MTD_OTP
352 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
353 {
354 struct mtd_info *mtd = mfi->mtd;
355 int ret = 0;
356
357 switch (mode) {
358 case MTD_OTP_FACTORY:
359 if (!mtd->read_fact_prot_reg)
360 ret = -EOPNOTSUPP;
361 else
362 mfi->mode = MTD_MODE_OTP_FACTORY;
363 break;
364 case MTD_OTP_USER:
365 if (!mtd->read_fact_prot_reg)
366 ret = -EOPNOTSUPP;
367 else
368 mfi->mode = MTD_MODE_OTP_USER;
369 break;
370 default:
371 ret = -EINVAL;
372 case MTD_OTP_OFF:
373 break;
374 }
375 return ret;
376 }
377 #else
378 # define otp_select_filemode(f,m) -EOPNOTSUPP
379 #endif
380
381 static int mtd_ioctl(struct inode *inode, struct file *file,
382 u_int cmd, u_long arg)
383 {
384 struct mtd_file_info *mfi = file->private_data;
385 struct mtd_info *mtd = mfi->mtd;
386 void __user *argp = (void __user *)arg;
387 int ret = 0;
388 u_long size;
389 struct mtd_info_user info;
390
391 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
392
393 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
394 if (cmd & IOC_IN) {
395 if (!access_ok(VERIFY_READ, argp, size))
396 return -EFAULT;
397 }
398 if (cmd & IOC_OUT) {
399 if (!access_ok(VERIFY_WRITE, argp, size))
400 return -EFAULT;
401 }
402
403 switch (cmd) {
404 case MEMGETREGIONCOUNT:
405 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
406 return -EFAULT;
407 break;
408
409 case MEMGETREGIONINFO:
410 {
411 uint32_t ur_idx;
412 struct mtd_erase_region_info *kr;
413 struct region_info_user *ur = (struct region_info_user *) argp;
414
415 if (get_user(ur_idx, &(ur->regionindex)))
416 return -EFAULT;
417
418 kr = &(mtd->eraseregions[ur_idx]);
419
420 if (put_user(kr->offset, &(ur->offset))
421 || put_user(kr->erasesize, &(ur->erasesize))
422 || put_user(kr->numblocks, &(ur->numblocks)))
423 return -EFAULT;
424
425 break;
426 }
427
428 case MEMGETINFO:
429 info.type = mtd->type;
430 info.flags = mtd->flags;
431 info.size = mtd->size;
432 info.erasesize = mtd->erasesize;
433 info.writesize = mtd->writesize;
434 info.oobsize = mtd->oobsize;
435 /* The below fields are obsolete */
436 info.ecctype = -1;
437 info.eccsize = 0;
438 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
439 return -EFAULT;
440 break;
441
442 case MEMERASE:
443 {
444 struct erase_info *erase;
445
446 if(!(file->f_mode & FMODE_WRITE))
447 return -EPERM;
448
449 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
450 if (!erase)
451 ret = -ENOMEM;
452 else {
453 struct erase_info_user einfo;
454
455 wait_queue_head_t waitq;
456 DECLARE_WAITQUEUE(wait, current);
457
458 init_waitqueue_head(&waitq);
459
460 if (copy_from_user(&einfo, argp,
461 sizeof(struct erase_info_user))) {
462 kfree(erase);
463 return -EFAULT;
464 }
465 erase->addr = einfo.start;
466 erase->len = einfo.length;
467 erase->mtd = mtd;
468 erase->callback = mtdchar_erase_callback;
469 erase->priv = (unsigned long)&waitq;
470
471 /*
472 FIXME: Allow INTERRUPTIBLE. Which means
473 not having the wait_queue head on the stack.
474
475 If the wq_head is on the stack, and we
476 leave because we got interrupted, then the
477 wq_head is no longer there when the
478 callback routine tries to wake us up.
479 */
480 ret = mtd->erase(mtd, erase);
481 if (!ret) {
482 set_current_state(TASK_UNINTERRUPTIBLE);
483 add_wait_queue(&waitq, &wait);
484 if (erase->state != MTD_ERASE_DONE &&
485 erase->state != MTD_ERASE_FAILED)
486 schedule();
487 remove_wait_queue(&waitq, &wait);
488 set_current_state(TASK_RUNNING);
489
490 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
491 }
492 kfree(erase);
493 }
494 break;
495 }
496
497 case MEMWRITEOOB:
498 {
499 struct mtd_oob_buf buf;
500 struct mtd_oob_ops ops;
501 struct mtd_oob_buf __user *user_buf = argp;
502 uint32_t retlen;
503
504 if(!(file->f_mode & FMODE_WRITE))
505 return -EPERM;
506
507 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
508 return -EFAULT;
509
510 if (buf.length > 4096)
511 return -EINVAL;
512
513 if (!mtd->write_oob)
514 ret = -EOPNOTSUPP;
515 else
516 ret = access_ok(VERIFY_READ, buf.ptr,
517 buf.length) ? 0 : EFAULT;
518
519 if (ret)
520 return ret;
521
522 ops.ooblen = buf.length;
523 ops.ooboffs = buf.start & (mtd->oobsize - 1);
524 ops.datbuf = NULL;
525 ops.mode = MTD_OOB_PLACE;
526
527 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
528 return -EINVAL;
529
530 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
531 if (!ops.oobbuf)
532 return -ENOMEM;
533
534 if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
535 kfree(ops.oobbuf);
536 return -EFAULT;
537 }
538
539 buf.start &= ~(mtd->oobsize - 1);
540 ret = mtd->write_oob(mtd, buf.start, &ops);
541
542 if (ops.oobretlen > 0xFFFFFFFFU)
543 ret = -EOVERFLOW;
544 retlen = ops.oobretlen;
545 if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
546 ret = -EFAULT;
547
548 kfree(ops.oobbuf);
549 break;
550
551 }
552
553 case MEMREADOOB:
554 {
555 struct mtd_oob_buf buf;
556 struct mtd_oob_ops ops;
557
558 if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
559 return -EFAULT;
560
561 if (buf.length > 4096)
562 return -EINVAL;
563
564 if (!mtd->read_oob)
565 ret = -EOPNOTSUPP;
566 else
567 ret = access_ok(VERIFY_WRITE, buf.ptr,
568 buf.length) ? 0 : -EFAULT;
569 if (ret)
570 return ret;
571
572 ops.ooblen = buf.length;
573 ops.ooboffs = buf.start & (mtd->oobsize - 1);
574 ops.datbuf = NULL;
575 ops.mode = MTD_OOB_PLACE;
576
577 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
578 return -EINVAL;
579
580 ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
581 if (!ops.oobbuf)
582 return -ENOMEM;
583
584 buf.start &= ~(mtd->oobsize - 1);
585 ret = mtd->read_oob(mtd, buf.start, &ops);
586
587 if (put_user(ops.oobretlen, (uint32_t __user *)argp))
588 ret = -EFAULT;
589 else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
590 ops.oobretlen))
591 ret = -EFAULT;
592
593 kfree(ops.oobbuf);
594 break;
595 }
596
597 case MEMLOCK:
598 {
599 struct erase_info_user einfo;
600
601 if (copy_from_user(&einfo, argp, sizeof(einfo)))
602 return -EFAULT;
603
604 if (!mtd->lock)
605 ret = -EOPNOTSUPP;
606 else
607 ret = mtd->lock(mtd, einfo.start, einfo.length);
608 break;
609 }
610
611 case MEMUNLOCK:
612 {
613 struct erase_info_user einfo;
614
615 if (copy_from_user(&einfo, argp, sizeof(einfo)))
616 return -EFAULT;
617
618 if (!mtd->unlock)
619 ret = -EOPNOTSUPP;
620 else
621 ret = mtd->unlock(mtd, einfo.start, einfo.length);
622 break;
623 }
624
625 /* Legacy interface */
626 case MEMGETOOBSEL:
627 {
628 struct nand_oobinfo oi;
629
630 if (!mtd->ecclayout)
631 return -EOPNOTSUPP;
632 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
633 return -EINVAL;
634
635 oi.useecc = MTD_NANDECC_AUTOPLACE;
636 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
637 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
638 sizeof(oi.oobfree));
639 oi.eccbytes = mtd->ecclayout->eccbytes;
640
641 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
642 return -EFAULT;
643 break;
644 }
645
646 case MEMGETBADBLOCK:
647 {
648 loff_t offs;
649
650 if (copy_from_user(&offs, argp, sizeof(loff_t)))
651 return -EFAULT;
652 if (!mtd->block_isbad)
653 ret = -EOPNOTSUPP;
654 else
655 return mtd->block_isbad(mtd, offs);
656 break;
657 }
658
659 case MEMSETBADBLOCK:
660 {
661 loff_t offs;
662
663 if (copy_from_user(&offs, argp, sizeof(loff_t)))
664 return -EFAULT;
665 if (!mtd->block_markbad)
666 ret = -EOPNOTSUPP;
667 else
668 return mtd->block_markbad(mtd, offs);
669 break;
670 }
671
672 #ifdef CONFIG_HAVE_MTD_OTP
673 case OTPSELECT:
674 {
675 int mode;
676 if (copy_from_user(&mode, argp, sizeof(int)))
677 return -EFAULT;
678
679 mfi->mode = MTD_MODE_NORMAL;
680
681 ret = otp_select_filemode(mfi, mode);
682
683 file->f_pos = 0;
684 break;
685 }
686
687 case OTPGETREGIONCOUNT:
688 case OTPGETREGIONINFO:
689 {
690 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
691 if (!buf)
692 return -ENOMEM;
693 ret = -EOPNOTSUPP;
694 switch (mfi->mode) {
695 case MTD_MODE_OTP_FACTORY:
696 if (mtd->get_fact_prot_info)
697 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
698 break;
699 case MTD_MODE_OTP_USER:
700 if (mtd->get_user_prot_info)
701 ret = mtd->get_user_prot_info(mtd, buf, 4096);
702 break;
703 default:
704 break;
705 }
706 if (ret >= 0) {
707 if (cmd == OTPGETREGIONCOUNT) {
708 int nbr = ret / sizeof(struct otp_info);
709 ret = copy_to_user(argp, &nbr, sizeof(int));
710 } else
711 ret = copy_to_user(argp, buf, ret);
712 if (ret)
713 ret = -EFAULT;
714 }
715 kfree(buf);
716 break;
717 }
718
719 case OTPLOCK:
720 {
721 struct otp_info oinfo;
722
723 if (mfi->mode != MTD_MODE_OTP_USER)
724 return -EINVAL;
725 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
726 return -EFAULT;
727 if (!mtd->lock_user_prot_reg)
728 return -EOPNOTSUPP;
729 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
730 break;
731 }
732 #endif
733
734 case ECCGETLAYOUT:
735 {
736 if (!mtd->ecclayout)
737 return -EOPNOTSUPP;
738
739 if (copy_to_user(argp, mtd->ecclayout,
740 sizeof(struct nand_ecclayout)))
741 return -EFAULT;
742 break;
743 }
744
745 case ECCGETSTATS:
746 {
747 if (copy_to_user(argp, &mtd->ecc_stats,
748 sizeof(struct mtd_ecc_stats)))
749 return -EFAULT;
750 break;
751 }
752
753 case MTDFILEMODE:
754 {
755 mfi->mode = 0;
756
757 switch(arg) {
758 case MTD_MODE_OTP_FACTORY:
759 case MTD_MODE_OTP_USER:
760 ret = otp_select_filemode(mfi, arg);
761 break;
762
763 case MTD_MODE_RAW:
764 if (!mtd->read_oob || !mtd->write_oob)
765 return -EOPNOTSUPP;
766 mfi->mode = arg;
767
768 case MTD_MODE_NORMAL:
769 break;
770 default:
771 ret = -EINVAL;
772 }
773 file->f_pos = 0;
774 break;
775 }
776
777 default:
778 ret = -ENOTTY;
779 }
780
781 return ret;
782 } /* memory_ioctl */
783
784 static const struct file_operations mtd_fops = {
785 .owner = THIS_MODULE,
786 .llseek = mtd_lseek,
787 .read = mtd_read,
788 .write = mtd_write,
789 .ioctl = mtd_ioctl,
790 .open = mtd_open,
791 .release = mtd_close,
792 };
793
794 static int __init init_mtdchar(void)
795 {
796 if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) {
797 printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
798 MTD_CHAR_MAJOR);
799 return -EAGAIN;
800 }
801
802 mtd_class = class_create(THIS_MODULE, "mtd");
803
804 if (IS_ERR(mtd_class)) {
805 printk(KERN_ERR "Error creating mtd class.\n");
806 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
807 return PTR_ERR(mtd_class);
808 }
809
810 register_mtd_user(&notifier);
811 return 0;
812 }
813
814 static void __exit cleanup_mtdchar(void)
815 {
816 unregister_mtd_user(&notifier);
817 class_destroy(mtd_class);
818 unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
819 }
820
821 module_init(init_mtdchar);
822 module_exit(cleanup_mtdchar);
823
824
825 MODULE_LICENSE("GPL");
826 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
827 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
Support for the Chinese Samsung S3C2440 based development boards