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