a34a0fe148841dc83007517e9adec2cca57bd25b
[~shefty/rdma-dev.git] / drivers / mtd / mtdchar.c
1 /*
2  * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
3  *
4  * This program is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation; either version 2 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  *
18  */
19
20 #include <linux/device.h>
21 #include <linux/fs.h>
22 #include <linux/mm.h>
23 #include <linux/err.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/sched.h>
29 #include <linux/mutex.h>
30 #include <linux/backing-dev.h>
31 #include <linux/compat.h>
32 #include <linux/mount.h>
33
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/map.h>
36
37 #include <asm/uaccess.h>
38
39 #define MTD_INODE_FS_MAGIC 0x11307854
40 static DEFINE_MUTEX(mtd_mutex);
41 static struct vfsmount *mtd_inode_mnt __read_mostly;
42
43 /*
44  * Data structure to hold the pointer to the mtd device as well
45  * as mode information ofr various use cases.
46  */
47 struct mtd_file_info {
48         struct mtd_info *mtd;
49         struct inode *ino;
50         enum mtd_file_modes mode;
51 };
52
53 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
54 {
55         struct mtd_file_info *mfi = file->private_data;
56         struct mtd_info *mtd = mfi->mtd;
57
58         switch (orig) {
59         case SEEK_SET:
60                 break;
61         case SEEK_CUR:
62                 offset += file->f_pos;
63                 break;
64         case SEEK_END:
65                 offset += mtd->size;
66                 break;
67         default:
68                 return -EINVAL;
69         }
70
71         if (offset >= 0 && offset <= mtd->size)
72                 return file->f_pos = offset;
73
74         return -EINVAL;
75 }
76
77
78
79 static int mtd_open(struct inode *inode, struct file *file)
80 {
81         int minor = iminor(inode);
82         int devnum = minor >> 1;
83         int ret = 0;
84         struct mtd_info *mtd;
85         struct mtd_file_info *mfi;
86         struct inode *mtd_ino;
87
88         DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
89
90         /* You can't open the RO devices RW */
91         if ((file->f_mode & FMODE_WRITE) && (minor & 1))
92                 return -EACCES;
93
94         mutex_lock(&mtd_mutex);
95         mtd = get_mtd_device(NULL, devnum);
96
97         if (IS_ERR(mtd)) {
98                 ret = PTR_ERR(mtd);
99                 goto out;
100         }
101
102         if (mtd->type == MTD_ABSENT) {
103                 put_mtd_device(mtd);
104                 ret = -ENODEV;
105                 goto out;
106         }
107
108         mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
109         if (!mtd_ino) {
110                 put_mtd_device(mtd);
111                 ret = -ENOMEM;
112                 goto out;
113         }
114         if (mtd_ino->i_state & I_NEW) {
115                 mtd_ino->i_private = mtd;
116                 mtd_ino->i_mode = S_IFCHR;
117                 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
118                 unlock_new_inode(mtd_ino);
119         }
120         file->f_mapping = mtd_ino->i_mapping;
121
122         /* You can't open it RW if it's not a writeable device */
123         if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
124                 iput(mtd_ino);
125                 put_mtd_device(mtd);
126                 ret = -EACCES;
127                 goto out;
128         }
129
130         mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
131         if (!mfi) {
132                 iput(mtd_ino);
133                 put_mtd_device(mtd);
134                 ret = -ENOMEM;
135                 goto out;
136         }
137         mfi->ino = mtd_ino;
138         mfi->mtd = mtd;
139         file->private_data = mfi;
140
141 out:
142         mutex_unlock(&mtd_mutex);
143         return ret;
144 } /* mtd_open */
145
146 /*====================================================================*/
147
148 static int mtd_close(struct inode *inode, struct file *file)
149 {
150         struct mtd_file_info *mfi = file->private_data;
151         struct mtd_info *mtd = mfi->mtd;
152
153         DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
154
155         /* Only sync if opened RW */
156         if ((file->f_mode & FMODE_WRITE) && mtd->sync)
157                 mtd->sync(mtd);
158
159         iput(mfi->ino);
160
161         put_mtd_device(mtd);
162         file->private_data = NULL;
163         kfree(mfi);
164
165         return 0;
166 } /* mtd_close */
167
168 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
169    userspace buffer down and use it directly with readv/writev.
170 */
171 #define MAX_KMALLOC_SIZE 0x20000
172
173 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
174 {
175         struct mtd_file_info *mfi = file->private_data;
176         struct mtd_info *mtd = mfi->mtd;
177         size_t retlen=0;
178         size_t total_retlen=0;
179         int ret=0;
180         int len;
181         char *kbuf;
182
183         DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
184
185         if (*ppos + count > mtd->size)
186                 count = mtd->size - *ppos;
187
188         if (!count)
189                 return 0;
190
191         /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
192            and pass them directly to the MTD functions */
193
194         if (count > MAX_KMALLOC_SIZE)
195                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
196         else
197                 kbuf=kmalloc(count, GFP_KERNEL);
198
199         if (!kbuf)
200                 return -ENOMEM;
201
202         while (count) {
203
204                 if (count > MAX_KMALLOC_SIZE)
205                         len = MAX_KMALLOC_SIZE;
206                 else
207                         len = count;
208
209                 switch (mfi->mode) {
210                 case MTD_MODE_OTP_FACTORY:
211                         ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
212                         break;
213                 case MTD_MODE_OTP_USER:
214                         ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
215                         break;
216                 case MTD_MODE_RAW:
217                 {
218                         struct mtd_oob_ops ops;
219
220                         ops.mode = MTD_OOB_RAW;
221                         ops.datbuf = kbuf;
222                         ops.oobbuf = NULL;
223                         ops.len = len;
224
225                         ret = mtd->read_oob(mtd, *ppos, &ops);
226                         retlen = ops.retlen;
227                         break;
228                 }
229                 default:
230                         ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
231                 }
232                 /* Nand returns -EBADMSG on ecc errors, but it returns
233                  * the data. For our userspace tools it is important
234                  * to dump areas with ecc errors !
235                  * For kernel internal usage it also might return -EUCLEAN
236                  * to signal the caller that a bitflip has occured and has
237                  * been corrected by the ECC algorithm.
238                  * Userspace software which accesses NAND this way
239                  * must be aware of the fact that it deals with NAND
240                  */
241                 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
242                         *ppos += retlen;
243                         if (copy_to_user(buf, kbuf, retlen)) {
244                                 kfree(kbuf);
245                                 return -EFAULT;
246                         }
247                         else
248                                 total_retlen += retlen;
249
250                         count -= retlen;
251                         buf += retlen;
252                         if (retlen == 0)
253                                 count = 0;
254                 }
255                 else {
256                         kfree(kbuf);
257                         return ret;
258                 }
259
260         }
261
262         kfree(kbuf);
263         return total_retlen;
264 } /* mtd_read */
265
266 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
267 {
268         struct mtd_file_info *mfi = file->private_data;
269         struct mtd_info *mtd = mfi->mtd;
270         char *kbuf;
271         size_t retlen;
272         size_t total_retlen=0;
273         int ret=0;
274         int len;
275
276         DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
277
278         if (*ppos == mtd->size)
279                 return -ENOSPC;
280
281         if (*ppos + count > mtd->size)
282                 count = mtd->size - *ppos;
283
284         if (!count)
285                 return 0;
286
287         if (count > MAX_KMALLOC_SIZE)
288                 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
289         else
290                 kbuf=kmalloc(count, GFP_KERNEL);
291
292         if (!kbuf)
293                 return -ENOMEM;
294
295         while (count) {
296
297                 if (count > MAX_KMALLOC_SIZE)
298                         len = MAX_KMALLOC_SIZE;
299                 else
300                         len = count;
301
302                 if (copy_from_user(kbuf, buf, len)) {
303                         kfree(kbuf);
304                         return -EFAULT;
305                 }
306
307                 switch (mfi->mode) {
308                 case MTD_MODE_OTP_FACTORY:
309                         ret = -EROFS;
310                         break;
311                 case MTD_MODE_OTP_USER:
312                         if (!mtd->write_user_prot_reg) {
313                                 ret = -EOPNOTSUPP;
314                                 break;
315                         }
316                         ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
317                         break;
318
319                 case MTD_MODE_RAW:
320                 {
321                         struct mtd_oob_ops ops;
322
323                         ops.mode = MTD_OOB_RAW;
324                         ops.datbuf = kbuf;
325                         ops.oobbuf = NULL;
326                         ops.len = len;
327
328                         ret = mtd->write_oob(mtd, *ppos, &ops);
329                         retlen = ops.retlen;
330                         break;
331                 }
332
333                 default:
334                         ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
335                 }
336                 if (!ret) {
337                         *ppos += retlen;
338                         total_retlen += retlen;
339                         count -= retlen;
340                         buf += retlen;
341                 }
342                 else {
343                         kfree(kbuf);
344                         return ret;
345                 }
346         }
347
348         kfree(kbuf);
349         return total_retlen;
350 } /* mtd_write */
351
352 /*======================================================================
353
354     IOCTL calls for getting device parameters.
355
356 ======================================================================*/
357 static void mtdchar_erase_callback (struct erase_info *instr)
358 {
359         wake_up((wait_queue_head_t *)instr->priv);
360 }
361
362 #ifdef CONFIG_HAVE_MTD_OTP
363 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
364 {
365         struct mtd_info *mtd = mfi->mtd;
366         int ret = 0;
367
368         switch (mode) {
369         case MTD_OTP_FACTORY:
370                 if (!mtd->read_fact_prot_reg)
371                         ret = -EOPNOTSUPP;
372                 else
373                         mfi->mode = MTD_MODE_OTP_FACTORY;
374                 break;
375         case MTD_OTP_USER:
376                 if (!mtd->read_fact_prot_reg)
377                         ret = -EOPNOTSUPP;
378                 else
379                         mfi->mode = MTD_MODE_OTP_USER;
380                 break;
381         default:
382                 ret = -EINVAL;
383         case MTD_OTP_OFF:
384                 break;
385         }
386         return ret;
387 }
388 #else
389 # define otp_select_filemode(f,m)       -EOPNOTSUPP
390 #endif
391
392 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
393         uint64_t start, uint32_t length, void __user *ptr,
394         uint32_t __user *retp)
395 {
396         struct mtd_oob_ops ops;
397         uint32_t retlen;
398         int ret = 0;
399
400         if (!(file->f_mode & FMODE_WRITE))
401                 return -EPERM;
402
403         if (length > 4096)
404                 return -EINVAL;
405
406         if (!mtd->write_oob)
407                 ret = -EOPNOTSUPP;
408         else
409                 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
410
411         if (ret)
412                 return ret;
413
414         ops.ooblen = length;
415         ops.ooboffs = start & (mtd->oobsize - 1);
416         ops.datbuf = NULL;
417         ops.mode = MTD_OOB_PLACE;
418
419         if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
420                 return -EINVAL;
421
422         ops.oobbuf = memdup_user(ptr, length);
423         if (IS_ERR(ops.oobbuf))
424                 return PTR_ERR(ops.oobbuf);
425
426         start &= ~((uint64_t)mtd->oobsize - 1);
427         ret = mtd->write_oob(mtd, start, &ops);
428
429         if (ops.oobretlen > 0xFFFFFFFFU)
430                 ret = -EOVERFLOW;
431         retlen = ops.oobretlen;
432         if (copy_to_user(retp, &retlen, sizeof(length)))
433                 ret = -EFAULT;
434
435         kfree(ops.oobbuf);
436         return ret;
437 }
438
439 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
440         uint32_t length, void __user *ptr, uint32_t __user *retp)
441 {
442         struct mtd_oob_ops ops;
443         int ret = 0;
444
445         if (length > 4096)
446                 return -EINVAL;
447
448         if (!mtd->read_oob)
449                 ret = -EOPNOTSUPP;
450         else
451                 ret = access_ok(VERIFY_WRITE, ptr,
452                                 length) ? 0 : -EFAULT;
453         if (ret)
454                 return ret;
455
456         ops.ooblen = length;
457         ops.ooboffs = start & (mtd->oobsize - 1);
458         ops.datbuf = NULL;
459         ops.mode = MTD_OOB_PLACE;
460
461         if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
462                 return -EINVAL;
463
464         ops.oobbuf = kmalloc(length, GFP_KERNEL);
465         if (!ops.oobbuf)
466                 return -ENOMEM;
467
468         start &= ~((uint64_t)mtd->oobsize - 1);
469         ret = mtd->read_oob(mtd, start, &ops);
470
471         if (put_user(ops.oobretlen, retp))
472                 ret = -EFAULT;
473         else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
474                                             ops.oobretlen))
475                 ret = -EFAULT;
476
477         kfree(ops.oobbuf);
478         return ret;
479 }
480
481 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
482 {
483         struct mtd_file_info *mfi = file->private_data;
484         struct mtd_info *mtd = mfi->mtd;
485         void __user *argp = (void __user *)arg;
486         int ret = 0;
487         u_long size;
488         struct mtd_info_user info;
489
490         DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
491
492         size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
493         if (cmd & IOC_IN) {
494                 if (!access_ok(VERIFY_READ, argp, size))
495                         return -EFAULT;
496         }
497         if (cmd & IOC_OUT) {
498                 if (!access_ok(VERIFY_WRITE, argp, size))
499                         return -EFAULT;
500         }
501
502         switch (cmd) {
503         case MEMGETREGIONCOUNT:
504                 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
505                         return -EFAULT;
506                 break;
507
508         case MEMGETREGIONINFO:
509         {
510                 uint32_t ur_idx;
511                 struct mtd_erase_region_info *kr;
512                 struct region_info_user __user *ur = argp;
513
514                 if (get_user(ur_idx, &(ur->regionindex)))
515                         return -EFAULT;
516
517                 kr = &(mtd->eraseregions[ur_idx]);
518
519                 if (put_user(kr->offset, &(ur->offset))
520                     || put_user(kr->erasesize, &(ur->erasesize))
521                     || put_user(kr->numblocks, &(ur->numblocks)))
522                         return -EFAULT;
523
524                 break;
525         }
526
527         case MEMGETINFO:
528                 info.type       = mtd->type;
529                 info.flags      = mtd->flags;
530                 info.size       = mtd->size;
531                 info.erasesize  = mtd->erasesize;
532                 info.writesize  = mtd->writesize;
533                 info.oobsize    = mtd->oobsize;
534                 /* The below fields are obsolete */
535                 info.ecctype    = -1;
536                 info.eccsize    = 0;
537                 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
538                         return -EFAULT;
539                 break;
540
541         case MEMERASE:
542         case MEMERASE64:
543         {
544                 struct erase_info *erase;
545
546                 if(!(file->f_mode & FMODE_WRITE))
547                         return -EPERM;
548
549                 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
550                 if (!erase)
551                         ret = -ENOMEM;
552                 else {
553                         wait_queue_head_t waitq;
554                         DECLARE_WAITQUEUE(wait, current);
555
556                         init_waitqueue_head(&waitq);
557
558                         if (cmd == MEMERASE64) {
559                                 struct erase_info_user64 einfo64;
560
561                                 if (copy_from_user(&einfo64, argp,
562                                             sizeof(struct erase_info_user64))) {
563                                         kfree(erase);
564                                         return -EFAULT;
565                                 }
566                                 erase->addr = einfo64.start;
567                                 erase->len = einfo64.length;
568                         } else {
569                                 struct erase_info_user einfo32;
570
571                                 if (copy_from_user(&einfo32, argp,
572                                             sizeof(struct erase_info_user))) {
573                                         kfree(erase);
574                                         return -EFAULT;
575                                 }
576                                 erase->addr = einfo32.start;
577                                 erase->len = einfo32.length;
578                         }
579                         erase->mtd = mtd;
580                         erase->callback = mtdchar_erase_callback;
581                         erase->priv = (unsigned long)&waitq;
582
583                         /*
584                           FIXME: Allow INTERRUPTIBLE. Which means
585                           not having the wait_queue head on the stack.
586
587                           If the wq_head is on the stack, and we
588                           leave because we got interrupted, then the
589                           wq_head is no longer there when the
590                           callback routine tries to wake us up.
591                         */
592                         ret = mtd->erase(mtd, erase);
593                         if (!ret) {
594                                 set_current_state(TASK_UNINTERRUPTIBLE);
595                                 add_wait_queue(&waitq, &wait);
596                                 if (erase->state != MTD_ERASE_DONE &&
597                                     erase->state != MTD_ERASE_FAILED)
598                                         schedule();
599                                 remove_wait_queue(&waitq, &wait);
600                                 set_current_state(TASK_RUNNING);
601
602                                 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
603                         }
604                         kfree(erase);
605                 }
606                 break;
607         }
608
609         case MEMWRITEOOB:
610         {
611                 struct mtd_oob_buf buf;
612                 struct mtd_oob_buf __user *buf_user = argp;
613
614                 /* NOTE: writes return length to buf_user->length */
615                 if (copy_from_user(&buf, argp, sizeof(buf)))
616                         ret = -EFAULT;
617                 else
618                         ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
619                                 buf.ptr, &buf_user->length);
620                 break;
621         }
622
623         case MEMREADOOB:
624         {
625                 struct mtd_oob_buf buf;
626                 struct mtd_oob_buf __user *buf_user = argp;
627
628                 /* NOTE: writes return length to buf_user->start */
629                 if (copy_from_user(&buf, argp, sizeof(buf)))
630                         ret = -EFAULT;
631                 else
632                         ret = mtd_do_readoob(mtd, buf.start, buf.length,
633                                 buf.ptr, &buf_user->start);
634                 break;
635         }
636
637         case MEMWRITEOOB64:
638         {
639                 struct mtd_oob_buf64 buf;
640                 struct mtd_oob_buf64 __user *buf_user = argp;
641
642                 if (copy_from_user(&buf, argp, sizeof(buf)))
643                         ret = -EFAULT;
644                 else
645                         ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
646                                 (void __user *)(uintptr_t)buf.usr_ptr,
647                                 &buf_user->length);
648                 break;
649         }
650
651         case MEMREADOOB64:
652         {
653                 struct mtd_oob_buf64 buf;
654                 struct mtd_oob_buf64 __user *buf_user = argp;
655
656                 if (copy_from_user(&buf, argp, sizeof(buf)))
657                         ret = -EFAULT;
658                 else
659                         ret = mtd_do_readoob(mtd, buf.start, buf.length,
660                                 (void __user *)(uintptr_t)buf.usr_ptr,
661                                 &buf_user->length);
662                 break;
663         }
664
665         case MEMLOCK:
666         {
667                 struct erase_info_user einfo;
668
669                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
670                         return -EFAULT;
671
672                 if (!mtd->lock)
673                         ret = -EOPNOTSUPP;
674                 else
675                         ret = mtd->lock(mtd, einfo.start, einfo.length);
676                 break;
677         }
678
679         case MEMUNLOCK:
680         {
681                 struct erase_info_user einfo;
682
683                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
684                         return -EFAULT;
685
686                 if (!mtd->unlock)
687                         ret = -EOPNOTSUPP;
688                 else
689                         ret = mtd->unlock(mtd, einfo.start, einfo.length);
690                 break;
691         }
692
693         case MEMISLOCKED:
694         {
695                 struct erase_info_user einfo;
696
697                 if (copy_from_user(&einfo, argp, sizeof(einfo)))
698                         return -EFAULT;
699
700                 if (!mtd->is_locked)
701                         ret = -EOPNOTSUPP;
702                 else
703                         ret = mtd->is_locked(mtd, einfo.start, einfo.length);
704                 break;
705         }
706
707         /* Legacy interface */
708         case MEMGETOOBSEL:
709         {
710                 struct nand_oobinfo oi;
711
712                 if (!mtd->ecclayout)
713                         return -EOPNOTSUPP;
714                 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
715                         return -EINVAL;
716
717                 oi.useecc = MTD_NANDECC_AUTOPLACE;
718                 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
719                 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
720                        sizeof(oi.oobfree));
721                 oi.eccbytes = mtd->ecclayout->eccbytes;
722
723                 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
724                         return -EFAULT;
725                 break;
726         }
727
728         case MEMGETBADBLOCK:
729         {
730                 loff_t offs;
731
732                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
733                         return -EFAULT;
734                 if (!mtd->block_isbad)
735                         ret = -EOPNOTSUPP;
736                 else
737                         return mtd->block_isbad(mtd, offs);
738                 break;
739         }
740
741         case MEMSETBADBLOCK:
742         {
743                 loff_t offs;
744
745                 if (copy_from_user(&offs, argp, sizeof(loff_t)))
746                         return -EFAULT;
747                 if (!mtd->block_markbad)
748                         ret = -EOPNOTSUPP;
749                 else
750                         return mtd->block_markbad(mtd, offs);
751                 break;
752         }
753
754 #ifdef CONFIG_HAVE_MTD_OTP
755         case OTPSELECT:
756         {
757                 int mode;
758                 if (copy_from_user(&mode, argp, sizeof(int)))
759                         return -EFAULT;
760
761                 mfi->mode = MTD_MODE_NORMAL;
762
763                 ret = otp_select_filemode(mfi, mode);
764
765                 file->f_pos = 0;
766                 break;
767         }
768
769         case OTPGETREGIONCOUNT:
770         case OTPGETREGIONINFO:
771         {
772                 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
773                 if (!buf)
774                         return -ENOMEM;
775                 ret = -EOPNOTSUPP;
776                 switch (mfi->mode) {
777                 case MTD_MODE_OTP_FACTORY:
778                         if (mtd->get_fact_prot_info)
779                                 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
780                         break;
781                 case MTD_MODE_OTP_USER:
782                         if (mtd->get_user_prot_info)
783                                 ret = mtd->get_user_prot_info(mtd, buf, 4096);
784                         break;
785                 default:
786                         break;
787                 }
788                 if (ret >= 0) {
789                         if (cmd == OTPGETREGIONCOUNT) {
790                                 int nbr = ret / sizeof(struct otp_info);
791                                 ret = copy_to_user(argp, &nbr, sizeof(int));
792                         } else
793                                 ret = copy_to_user(argp, buf, ret);
794                         if (ret)
795                                 ret = -EFAULT;
796                 }
797                 kfree(buf);
798                 break;
799         }
800
801         case OTPLOCK:
802         {
803                 struct otp_info oinfo;
804
805                 if (mfi->mode != MTD_MODE_OTP_USER)
806                         return -EINVAL;
807                 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
808                         return -EFAULT;
809                 if (!mtd->lock_user_prot_reg)
810                         return -EOPNOTSUPP;
811                 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
812                 break;
813         }
814 #endif
815
816         case ECCGETLAYOUT:
817         {
818                 if (!mtd->ecclayout)
819                         return -EOPNOTSUPP;
820
821                 if (copy_to_user(argp, mtd->ecclayout,
822                                  sizeof(struct nand_ecclayout)))
823                         return -EFAULT;
824                 break;
825         }
826
827         case ECCGETSTATS:
828         {
829                 if (copy_to_user(argp, &mtd->ecc_stats,
830                                  sizeof(struct mtd_ecc_stats)))
831                         return -EFAULT;
832                 break;
833         }
834
835         case MTDFILEMODE:
836         {
837                 mfi->mode = 0;
838
839                 switch(arg) {
840                 case MTD_MODE_OTP_FACTORY:
841                 case MTD_MODE_OTP_USER:
842                         ret = otp_select_filemode(mfi, arg);
843                         break;
844
845                 case MTD_MODE_RAW:
846                         if (!mtd->read_oob || !mtd->write_oob)
847                                 return -EOPNOTSUPP;
848                         mfi->mode = arg;
849
850                 case MTD_MODE_NORMAL:
851                         break;
852                 default:
853                         ret = -EINVAL;
854                 }
855                 file->f_pos = 0;
856                 break;
857         }
858
859         default:
860                 ret = -ENOTTY;
861         }
862
863         return ret;
864 } /* memory_ioctl */
865
866 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
867 {
868         int ret;
869
870         mutex_lock(&mtd_mutex);
871         ret = mtd_ioctl(file, cmd, arg);
872         mutex_unlock(&mtd_mutex);
873
874         return ret;
875 }
876
877 #ifdef CONFIG_COMPAT
878
879 struct mtd_oob_buf32 {
880         u_int32_t start;
881         u_int32_t length;
882         compat_caddr_t ptr;     /* unsigned char* */
883 };
884
885 #define MEMWRITEOOB32           _IOWR('M', 3, struct mtd_oob_buf32)
886 #define MEMREADOOB32            _IOWR('M', 4, struct mtd_oob_buf32)
887
888 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
889         unsigned long arg)
890 {
891         struct mtd_file_info *mfi = file->private_data;
892         struct mtd_info *mtd = mfi->mtd;
893         void __user *argp = compat_ptr(arg);
894         int ret = 0;
895
896         mutex_lock(&mtd_mutex);
897
898         switch (cmd) {
899         case MEMWRITEOOB32:
900         {
901                 struct mtd_oob_buf32 buf;
902                 struct mtd_oob_buf32 __user *buf_user = argp;
903
904                 if (copy_from_user(&buf, argp, sizeof(buf)))
905                         ret = -EFAULT;
906                 else
907                         ret = mtd_do_writeoob(file, mtd, buf.start,
908                                 buf.length, compat_ptr(buf.ptr),
909                                 &buf_user->length);
910                 break;
911         }
912
913         case MEMREADOOB32:
914         {
915                 struct mtd_oob_buf32 buf;
916                 struct mtd_oob_buf32 __user *buf_user = argp;
917
918                 /* NOTE: writes return length to buf->start */
919                 if (copy_from_user(&buf, argp, sizeof(buf)))
920                         ret = -EFAULT;
921                 else
922                         ret = mtd_do_readoob(mtd, buf.start,
923                                 buf.length, compat_ptr(buf.ptr),
924                                 &buf_user->start);
925                 break;
926         }
927         default:
928                 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
929         }
930
931         mutex_unlock(&mtd_mutex);
932
933         return ret;
934 }
935
936 #endif /* CONFIG_COMPAT */
937
938 /*
939  * try to determine where a shared mapping can be made
940  * - only supported for NOMMU at the moment (MMU can't doesn't copy private
941  *   mappings)
942  */
943 #ifndef CONFIG_MMU
944 static unsigned long mtd_get_unmapped_area(struct file *file,
945                                            unsigned long addr,
946                                            unsigned long len,
947                                            unsigned long pgoff,
948                                            unsigned long flags)
949 {
950         struct mtd_file_info *mfi = file->private_data;
951         struct mtd_info *mtd = mfi->mtd;
952
953         if (mtd->get_unmapped_area) {
954                 unsigned long offset;
955
956                 if (addr != 0)
957                         return (unsigned long) -EINVAL;
958
959                 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
960                         return (unsigned long) -EINVAL;
961
962                 offset = pgoff << PAGE_SHIFT;
963                 if (offset > mtd->size - len)
964                         return (unsigned long) -EINVAL;
965
966                 return mtd->get_unmapped_area(mtd, len, offset, flags);
967         }
968
969         /* can't map directly */
970         return (unsigned long) -ENOSYS;
971 }
972 #endif
973
974 /*
975  * set up a mapping for shared memory segments
976  */
977 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
978 {
979 #ifdef CONFIG_MMU
980         struct mtd_file_info *mfi = file->private_data;
981         struct mtd_info *mtd = mfi->mtd;
982         struct map_info *map = mtd->priv;
983         unsigned long start;
984         unsigned long off;
985         u32 len;
986
987         if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
988                 off = vma->vm_pgoff << PAGE_SHIFT;
989                 start = map->phys;
990                 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
991                 start &= PAGE_MASK;
992                 if ((vma->vm_end - vma->vm_start + off) > len)
993                         return -EINVAL;
994
995                 off += start;
996                 vma->vm_pgoff = off >> PAGE_SHIFT;
997                 vma->vm_flags |= VM_IO | VM_RESERVED;
998
999 #ifdef pgprot_noncached
1000                 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1001                         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1002 #endif
1003                 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1004                                        vma->vm_end - vma->vm_start,
1005                                        vma->vm_page_prot))
1006                         return -EAGAIN;
1007
1008                 return 0;
1009         }
1010         return -ENOSYS;
1011 #else
1012         return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1013 #endif
1014 }
1015
1016 static const struct file_operations mtd_fops = {
1017         .owner          = THIS_MODULE,
1018         .llseek         = mtd_lseek,
1019         .read           = mtd_read,
1020         .write          = mtd_write,
1021         .unlocked_ioctl = mtd_unlocked_ioctl,
1022 #ifdef CONFIG_COMPAT
1023         .compat_ioctl   = mtd_compat_ioctl,
1024 #endif
1025         .open           = mtd_open,
1026         .release        = mtd_close,
1027         .mmap           = mtd_mmap,
1028 #ifndef CONFIG_MMU
1029         .get_unmapped_area = mtd_get_unmapped_area,
1030 #endif
1031 };
1032
1033 static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1034                                 int flags, const char *dev_name, void *data)
1035 {
1036         return mount_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC);
1037 }
1038
1039 static struct file_system_type mtd_inodefs_type = {
1040        .name = "mtd_inodefs",
1041        .mount = mtd_inodefs_mount,
1042        .kill_sb = kill_anon_super,
1043 };
1044
1045 static void mtdchar_notify_add(struct mtd_info *mtd)
1046 {
1047 }
1048
1049 static void mtdchar_notify_remove(struct mtd_info *mtd)
1050 {
1051         struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1052
1053         if (mtd_ino) {
1054                 /* Destroy the inode if it exists */
1055                 mtd_ino->i_nlink = 0;
1056                 iput(mtd_ino);
1057         }
1058 }
1059
1060 static struct mtd_notifier mtdchar_notifier = {
1061         .add = mtdchar_notify_add,
1062         .remove = mtdchar_notify_remove,
1063 };
1064
1065 static int __init init_mtdchar(void)
1066 {
1067         int ret;
1068
1069         ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1070                                    "mtd", &mtd_fops);
1071         if (ret < 0) {
1072                 pr_notice("Can't allocate major number %d for "
1073                                 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1074                 return ret;
1075         }
1076
1077         ret = register_filesystem(&mtd_inodefs_type);
1078         if (ret) {
1079                 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1080                 goto err_unregister_chdev;
1081         }
1082
1083         mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1084         if (IS_ERR(mtd_inode_mnt)) {
1085                 ret = PTR_ERR(mtd_inode_mnt);
1086                 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1087                 goto err_unregister_filesystem;
1088         }
1089         register_mtd_user(&mtdchar_notifier);
1090
1091         return ret;
1092
1093 err_unregister_filesystem:
1094         unregister_filesystem(&mtd_inodefs_type);
1095 err_unregister_chdev:
1096         __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1097         return ret;
1098 }
1099
1100 static void __exit cleanup_mtdchar(void)
1101 {
1102         unregister_mtd_user(&mtdchar_notifier);
1103         mntput(mtd_inode_mnt);
1104         unregister_filesystem(&mtd_inodefs_type);
1105         __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1106 }
1107
1108 module_init(init_mtdchar);
1109 module_exit(cleanup_mtdchar);
1110
1111 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1112
1113 MODULE_LICENSE("GPL");
1114 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1115 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1116 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);