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aio: remove unnecessary check
[linux-2.6/next.git] / drivers / mtd / mtdchar.c
blobf511dd15fd318b3a83c5c270fd2344845a648fcc
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 #include <linux/blkpg.h>
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/partitions.h>
36 #include <linux/mtd/map.h>
37
38 #include <asm/uaccess.h>
39
40 #define MTD_INODE_FS_MAGIC 0x11307854
41 static DEFINE_MUTEX(mtd_mutex);
42 static struct vfsmount *mtd_inode_mnt __read_mostly;
43
44 /*
45 * Data structure to hold the pointer to the mtd device as well
46 * as mode information ofr various use cases.
47 */
48 struct mtd_file_info {
49 struct mtd_info *mtd;
50 struct inode *ino;
51 enum mtd_file_modes mode;
52 };
53
54 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
55 {
56 struct mtd_file_info *mfi = file->private_data;
57 struct mtd_info *mtd = mfi->mtd;
58
59 switch (orig) {
60 case SEEK_SET:
61 break;
62 case SEEK_CUR:
63 offset += file->f_pos;
64 break;
65 case SEEK_END:
66 offset += mtd->size;
67 break;
68 default:
69 return -EINVAL;
70 }
71
72 if (offset >= 0 && offset <= mtd->size)
73 return file->f_pos = offset;
74
75 return -EINVAL;
76 }
77
78
79
80 static int mtd_open(struct inode *inode, struct file *file)
81 {
82 int minor = iminor(inode);
83 int devnum = minor >> 1;
84 int ret = 0;
85 struct mtd_info *mtd;
86 struct mtd_file_info *mfi;
87 struct inode *mtd_ino;
88
89 DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
90
91 /* You can't open the RO devices RW */
92 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
93 return -EACCES;
94
95 mutex_lock(&mtd_mutex);
96 mtd = get_mtd_device(NULL, devnum);
97
98 if (IS_ERR(mtd)) {
99 ret = PTR_ERR(mtd);
100 goto out;
101 }
102
103 if (mtd->type == MTD_ABSENT) {
104 put_mtd_device(mtd);
105 ret = -ENODEV;
106 goto out;
107 }
108
109 mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
110 if (!mtd_ino) {
111 put_mtd_device(mtd);
112 ret = -ENOMEM;
113 goto out;
114 }
115 if (mtd_ino->i_state & I_NEW) {
116 mtd_ino->i_private = mtd;
117 mtd_ino->i_mode = S_IFCHR;
118 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
119 unlock_new_inode(mtd_ino);
120 }
121 file->f_mapping = mtd_ino->i_mapping;
122
123 /* You can't open it RW if it's not a writeable device */
124 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
125 iput(mtd_ino);
126 put_mtd_device(mtd);
127 ret = -EACCES;
128 goto out;
129 }
130
131 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
132 if (!mfi) {
133 iput(mtd_ino);
134 put_mtd_device(mtd);
135 ret = -ENOMEM;
136 goto out;
137 }
138 mfi->ino = mtd_ino;
139 mfi->mtd = mtd;
140 file->private_data = mfi;
141
142 out:
143 mutex_unlock(&mtd_mutex);
144 return ret;
145 } /* mtd_open */
146
147 /*====================================================================*/
148
149 static int mtd_close(struct inode *inode, struct file *file)
150 {
151 struct mtd_file_info *mfi = file->private_data;
152 struct mtd_info *mtd = mfi->mtd;
153
154 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
155
156 /* Only sync if opened RW */
157 if ((file->f_mode & FMODE_WRITE) && mtd->sync)
158 mtd->sync(mtd);
159
160 iput(mfi->ino);
161
162 put_mtd_device(mtd);
163 file->private_data = NULL;
164 kfree(mfi);
165
166 return 0;
167 } /* mtd_close */
168
169 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
170 userspace buffer down and use it directly with readv/writev.
171 */
172 #define MAX_KMALLOC_SIZE 0x20000
173
174 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
175 {
176 struct mtd_file_info *mfi = file->private_data;
177 struct mtd_info *mtd = mfi->mtd;
178 size_t retlen=0;
179 size_t total_retlen=0;
180 int ret=0;
181 int len;
182 char *kbuf;
183
184 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
185
186 if (*ppos + count > mtd->size)
187 count = mtd->size - *ppos;
188
189 if (!count)
190 return 0;
191
192 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
193 and pass them directly to the MTD functions */
194
195 if (count > MAX_KMALLOC_SIZE)
196 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
197 else
198 kbuf=kmalloc(count, GFP_KERNEL);
199
200 if (!kbuf)
201 return -ENOMEM;
202
203 while (count) {
204
205 if (count > MAX_KMALLOC_SIZE)
206 len = MAX_KMALLOC_SIZE;
207 else
208 len = count;
209
210 switch (mfi->mode) {
211 case MTD_MODE_OTP_FACTORY:
212 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
213 break;
214 case MTD_MODE_OTP_USER:
215 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
216 break;
217 case MTD_MODE_RAW:
218 {
219 struct mtd_oob_ops ops;
220
221 ops.mode = MTD_OOB_RAW;
222 ops.datbuf = kbuf;
223 ops.oobbuf = NULL;
224 ops.len = len;
225
226 ret = mtd->read_oob(mtd, *ppos, &ops);
227 retlen = ops.retlen;
228 break;
229 }
230 default:
231 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
232 }
233 /* Nand returns -EBADMSG on ecc errors, but it returns
234 * the data. For our userspace tools it is important
235 * to dump areas with ecc errors !
236 * For kernel internal usage it also might return -EUCLEAN
237 * to signal the caller that a bitflip has occured and has
238 * been corrected by the ECC algorithm.
239 * Userspace software which accesses NAND this way
240 * must be aware of the fact that it deals with NAND
241 */
242 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
243 *ppos += retlen;
244 if (copy_to_user(buf, kbuf, retlen)) {
245 kfree(kbuf);
246 return -EFAULT;
247 }
248 else
249 total_retlen += retlen;
250
251 count -= retlen;
252 buf += retlen;
253 if (retlen == 0)
254 count = 0;
255 }
256 else {
257 kfree(kbuf);
258 return ret;
259 }
260
261 }
262
263 kfree(kbuf);
264 return total_retlen;
265 } /* mtd_read */
266
267 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
268 {
269 struct mtd_file_info *mfi = file->private_data;
270 struct mtd_info *mtd = mfi->mtd;
271 char *kbuf;
272 size_t retlen;
273 size_t total_retlen=0;
274 int ret=0;
275 int len;
276
277 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
278
279 if (*ppos == mtd->size)
280 return -ENOSPC;
281
282 if (*ppos + count > mtd->size)
283 count = mtd->size - *ppos;
284
285 if (!count)
286 return 0;
287
288 if (count > MAX_KMALLOC_SIZE)
289 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
290 else
291 kbuf=kmalloc(count, GFP_KERNEL);
292
293 if (!kbuf)
294 return -ENOMEM;
295
296 while (count) {
297
298 if (count > MAX_KMALLOC_SIZE)
299 len = MAX_KMALLOC_SIZE;
300 else
301 len = count;
302
303 if (copy_from_user(kbuf, buf, len)) {
304 kfree(kbuf);
305 return -EFAULT;
306 }
307
308 switch (mfi->mode) {
309 case MTD_MODE_OTP_FACTORY:
310 ret = -EROFS;
311 break;
312 case MTD_MODE_OTP_USER:
313 if (!mtd->write_user_prot_reg) {
314 ret = -EOPNOTSUPP;
315 break;
316 }
317 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
318 break;
319
320 case MTD_MODE_RAW:
321 {
322 struct mtd_oob_ops ops;
323
324 ops.mode = MTD_OOB_RAW;
325 ops.datbuf = kbuf;
326 ops.oobbuf = NULL;
327 ops.len = len;
328
329 ret = mtd->write_oob(mtd, *ppos, &ops);
330 retlen = ops.retlen;
331 break;
332 }
333
334 default:
335 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
336 }
337 if (!ret) {
338 *ppos += retlen;
339 total_retlen += retlen;
340 count -= retlen;
341 buf += retlen;
342 }
343 else {
344 kfree(kbuf);
345 return ret;
346 }
347 }
348
349 kfree(kbuf);
350 return total_retlen;
351 } /* mtd_write */
352
353 /*======================================================================
354
355 IOCTL calls for getting device parameters.
356
357 ======================================================================*/
358 static void mtdchar_erase_callback (struct erase_info *instr)
359 {
360 wake_up((wait_queue_head_t *)instr->priv);
361 }
362
363 #ifdef CONFIG_HAVE_MTD_OTP
364 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
365 {
366 struct mtd_info *mtd = mfi->mtd;
367 int ret = 0;
368
369 switch (mode) {
370 case MTD_OTP_FACTORY:
371 if (!mtd->read_fact_prot_reg)
372 ret = -EOPNOTSUPP;
373 else
374 mfi->mode = MTD_MODE_OTP_FACTORY;
375 break;
376 case MTD_OTP_USER:
377 if (!mtd->read_fact_prot_reg)
378 ret = -EOPNOTSUPP;
379 else
380 mfi->mode = MTD_MODE_OTP_USER;
381 break;
382 default:
383 ret = -EINVAL;
384 case MTD_OTP_OFF:
385 break;
386 }
387 return ret;
388 }
389 #else
390 # define otp_select_filemode(f,m) -EOPNOTSUPP
391 #endif
392
393 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
394 uint64_t start, uint32_t length, void __user *ptr,
395 uint32_t __user *retp)
396 {
397 struct mtd_oob_ops ops;
398 uint32_t retlen;
399 int ret = 0;
400
401 if (!(file->f_mode & FMODE_WRITE))
402 return -EPERM;
403
404 if (length > 4096)
405 return -EINVAL;
406
407 if (!mtd->write_oob)
408 ret = -EOPNOTSUPP;
409 else
410 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
411
412 if (ret)
413 return ret;
414
415 ops.ooblen = length;
416 ops.ooboffs = start & (mtd->oobsize - 1);
417 ops.datbuf = NULL;
418 ops.mode = MTD_OOB_PLACE;
419
420 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
421 return -EINVAL;
422
423 ops.oobbuf = memdup_user(ptr, length);
424 if (IS_ERR(ops.oobbuf))
425 return PTR_ERR(ops.oobbuf);
426
427 start &= ~((uint64_t)mtd->oobsize - 1);
428 ret = mtd->write_oob(mtd, start, &ops);
429
430 if (ops.oobretlen > 0xFFFFFFFFU)
431 ret = -EOVERFLOW;
432 retlen = ops.oobretlen;
433 if (copy_to_user(retp, &retlen, sizeof(length)))
434 ret = -EFAULT;
435
436 kfree(ops.oobbuf);
437 return ret;
438 }
439
440 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
441 uint32_t length, void __user *ptr, uint32_t __user *retp)
442 {
443 struct mtd_oob_ops ops;
444 int ret = 0;
445
446 if (length > 4096)
447 return -EINVAL;
448
449 if (!mtd->read_oob)
450 ret = -EOPNOTSUPP;
451 else
452 ret = access_ok(VERIFY_WRITE, ptr,
453 length) ? 0 : -EFAULT;
454 if (ret)
455 return ret;
456
457 ops.ooblen = length;
458 ops.ooboffs = start & (mtd->oobsize - 1);
459 ops.datbuf = NULL;
460 ops.mode = MTD_OOB_PLACE;
461
462 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
463 return -EINVAL;
464
465 ops.oobbuf = kmalloc(length, GFP_KERNEL);
466 if (!ops.oobbuf)
467 return -ENOMEM;
468
469 start &= ~((uint64_t)mtd->oobsize - 1);
470 ret = mtd->read_oob(mtd, start, &ops);
471
472 if (put_user(ops.oobretlen, retp))
473 ret = -EFAULT;
474 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
475 ops.oobretlen))
476 ret = -EFAULT;
477
478 kfree(ops.oobbuf);
479 return ret;
480 }
481
482 /*
483 * Copies (and truncates, if necessary) data from the larger struct,
484 * nand_ecclayout, to the smaller, deprecated layout struct,
485 * nand_ecclayout_user. This is necessary only to suppport the deprecated
486 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
487 * nand_ecclayout flexibly (i.e. the struct may change size in new
488 * releases without requiring major rewrites).
489 */
490 static int shrink_ecclayout(const struct nand_ecclayout *from,
491 struct nand_ecclayout_user *to)
492 {
493 int i;
494
495 if (!from || !to)
496 return -EINVAL;
497
498 memset(to, 0, sizeof(*to));
499
500 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
501 for (i = 0; i < to->eccbytes; i++)
502 to->eccpos[i] = from->eccpos[i];
503
504 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
505 if (from->oobfree[i].length == 0 &&
506 from->oobfree[i].offset == 0)
507 break;
508 to->oobavail += from->oobfree[i].length;
509 to->oobfree[i] = from->oobfree[i];
510 }
511
512 return 0;
513 }
514
515 #ifdef CONFIG_MTD_PARTITIONS
516 static int mtd_blkpg_ioctl(struct mtd_info *mtd,
517 struct blkpg_ioctl_arg __user *arg)
518 {
519 struct blkpg_ioctl_arg a;
520 struct blkpg_partition p;
521
522 if (!capable(CAP_SYS_ADMIN))
523 return -EPERM;
524
525 /* Only master mtd device must be used to control partitions */
526 if (!mtd_is_master(mtd))
527 return -EINVAL;
528
529 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
530 return -EFAULT;
531
532 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
533 return -EFAULT;
534
535 switch (a.op) {
536 case BLKPG_ADD_PARTITION:
537
538 return mtd_add_partition(mtd, p.devname, p.start, p.length);
539
540 case BLKPG_DEL_PARTITION:
541
542 if (p.pno < 0)
543 return -EINVAL;
544
545 return mtd_del_partition(mtd, p.pno);
546
547 default:
548 return -EINVAL;
549 }
550 }
551 #endif
552
553
554 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
555 {
556 struct mtd_file_info *mfi = file->private_data;
557 struct mtd_info *mtd = mfi->mtd;
558 void __user *argp = (void __user *)arg;
559 int ret = 0;
560 u_long size;
561 struct mtd_info_user info;
562
563 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
564
565 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
566 if (cmd & IOC_IN) {
567 if (!access_ok(VERIFY_READ, argp, size))
568 return -EFAULT;
569 }
570 if (cmd & IOC_OUT) {
571 if (!access_ok(VERIFY_WRITE, argp, size))
572 return -EFAULT;
573 }
574
575 switch (cmd) {
576 case MEMGETREGIONCOUNT:
577 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
578 return -EFAULT;
579 break;
580
581 case MEMGETREGIONINFO:
582 {
583 uint32_t ur_idx;
584 struct mtd_erase_region_info *kr;
585 struct region_info_user __user *ur = argp;
586
587 if (get_user(ur_idx, &(ur->regionindex)))
588 return -EFAULT;
589
590 if (ur_idx >= mtd->numeraseregions)
591 return -EINVAL;
592
593 kr = &(mtd->eraseregions[ur_idx]);
594
595 if (put_user(kr->offset, &(ur->offset))
596 || put_user(kr->erasesize, &(ur->erasesize))
597 || put_user(kr->numblocks, &(ur->numblocks)))
598 return -EFAULT;
599
600 break;
601 }
602
603 case MEMGETINFO:
604 info.type = mtd->type;
605 info.flags = mtd->flags;
606 info.size = mtd->size;
607 info.erasesize = mtd->erasesize;
608 info.writesize = mtd->writesize;
609 info.oobsize = mtd->oobsize;
610 /* The below fields are obsolete */
611 info.ecctype = -1;
612 info.eccsize = 0;
613 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
614 return -EFAULT;
615 break;
616
617 case MEMERASE:
618 case MEMERASE64:
619 {
620 struct erase_info *erase;
621
622 if(!(file->f_mode & FMODE_WRITE))
623 return -EPERM;
624
625 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
626 if (!erase)
627 ret = -ENOMEM;
628 else {
629 wait_queue_head_t waitq;
630 DECLARE_WAITQUEUE(wait, current);
631
632 init_waitqueue_head(&waitq);
633
634 if (cmd == MEMERASE64) {
635 struct erase_info_user64 einfo64;
636
637 if (copy_from_user(&einfo64, argp,
638 sizeof(struct erase_info_user64))) {
639 kfree(erase);
640 return -EFAULT;
641 }
642 erase->addr = einfo64.start;
643 erase->len = einfo64.length;
644 } else {
645 struct erase_info_user einfo32;
646
647 if (copy_from_user(&einfo32, argp,
648 sizeof(struct erase_info_user))) {
649 kfree(erase);
650 return -EFAULT;
651 }
652 erase->addr = einfo32.start;
653 erase->len = einfo32.length;
654 }
655 erase->mtd = mtd;
656 erase->callback = mtdchar_erase_callback;
657 erase->priv = (unsigned long)&waitq;
658
659 /*
660 FIXME: Allow INTERRUPTIBLE. Which means
661 not having the wait_queue head on the stack.
662
663 If the wq_head is on the stack, and we
664 leave because we got interrupted, then the
665 wq_head is no longer there when the
666 callback routine tries to wake us up.
667 */
668 ret = mtd->erase(mtd, erase);
669 if (!ret) {
670 set_current_state(TASK_UNINTERRUPTIBLE);
671 add_wait_queue(&waitq, &wait);
672 if (erase->state != MTD_ERASE_DONE &&
673 erase->state != MTD_ERASE_FAILED)
674 schedule();
675 remove_wait_queue(&waitq, &wait);
676 set_current_state(TASK_RUNNING);
677
678 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
679 }
680 kfree(erase);
681 }
682 break;
683 }
684
685 case MEMWRITEOOB:
686 {
687 struct mtd_oob_buf buf;
688 struct mtd_oob_buf __user *buf_user = argp;
689
690 /* NOTE: writes return length to buf_user->length */
691 if (copy_from_user(&buf, argp, sizeof(buf)))
692 ret = -EFAULT;
693 else
694 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
695 buf.ptr, &buf_user->length);
696 break;
697 }
698
699 case MEMREADOOB:
700 {
701 struct mtd_oob_buf buf;
702 struct mtd_oob_buf __user *buf_user = argp;
703
704 /* NOTE: writes return length to buf_user->start */
705 if (copy_from_user(&buf, argp, sizeof(buf)))
706 ret = -EFAULT;
707 else
708 ret = mtd_do_readoob(mtd, buf.start, buf.length,
709 buf.ptr, &buf_user->start);
710 break;
711 }
712
713 case MEMWRITEOOB64:
714 {
715 struct mtd_oob_buf64 buf;
716 struct mtd_oob_buf64 __user *buf_user = argp;
717
718 if (copy_from_user(&buf, argp, sizeof(buf)))
719 ret = -EFAULT;
720 else
721 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
722 (void __user *)(uintptr_t)buf.usr_ptr,
723 &buf_user->length);
724 break;
725 }
726
727 case MEMREADOOB64:
728 {
729 struct mtd_oob_buf64 buf;
730 struct mtd_oob_buf64 __user *buf_user = argp;
731
732 if (copy_from_user(&buf, argp, sizeof(buf)))
733 ret = -EFAULT;
734 else
735 ret = mtd_do_readoob(mtd, buf.start, buf.length,
736 (void __user *)(uintptr_t)buf.usr_ptr,
737 &buf_user->length);
738 break;
739 }
740
741 case MEMLOCK:
742 {
743 struct erase_info_user einfo;
744
745 if (copy_from_user(&einfo, argp, sizeof(einfo)))
746 return -EFAULT;
747
748 if (!mtd->lock)
749 ret = -EOPNOTSUPP;
750 else
751 ret = mtd->lock(mtd, einfo.start, einfo.length);
752 break;
753 }
754
755 case MEMUNLOCK:
756 {
757 struct erase_info_user einfo;
758
759 if (copy_from_user(&einfo, argp, sizeof(einfo)))
760 return -EFAULT;
761
762 if (!mtd->unlock)
763 ret = -EOPNOTSUPP;
764 else
765 ret = mtd->unlock(mtd, einfo.start, einfo.length);
766 break;
767 }
768
769 case MEMISLOCKED:
770 {
771 struct erase_info_user einfo;
772
773 if (copy_from_user(&einfo, argp, sizeof(einfo)))
774 return -EFAULT;
775
776 if (!mtd->is_locked)
777 ret = -EOPNOTSUPP;
778 else
779 ret = mtd->is_locked(mtd, einfo.start, einfo.length);
780 break;
781 }
782
783 /* Legacy interface */
784 case MEMGETOOBSEL:
785 {
786 struct nand_oobinfo oi;
787
788 if (!mtd->ecclayout)
789 return -EOPNOTSUPP;
790 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
791 return -EINVAL;
792
793 oi.useecc = MTD_NANDECC_AUTOPLACE;
794 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
795 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
796 sizeof(oi.oobfree));
797 oi.eccbytes = mtd->ecclayout->eccbytes;
798
799 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
800 return -EFAULT;
801 break;
802 }
803
804 case MEMGETBADBLOCK:
805 {
806 loff_t offs;
807
808 if (copy_from_user(&offs, argp, sizeof(loff_t)))
809 return -EFAULT;
810 if (!mtd->block_isbad)
811 ret = -EOPNOTSUPP;
812 else
813 return mtd->block_isbad(mtd, offs);
814 break;
815 }
816
817 case MEMSETBADBLOCK:
818 {
819 loff_t offs;
820
821 if (copy_from_user(&offs, argp, sizeof(loff_t)))
822 return -EFAULT;
823 if (!mtd->block_markbad)
824 ret = -EOPNOTSUPP;
825 else
826 return mtd->block_markbad(mtd, offs);
827 break;
828 }
829
830 #ifdef CONFIG_HAVE_MTD_OTP
831 case OTPSELECT:
832 {
833 int mode;
834 if (copy_from_user(&mode, argp, sizeof(int)))
835 return -EFAULT;
836
837 mfi->mode = MTD_MODE_NORMAL;
838
839 ret = otp_select_filemode(mfi, mode);
840
841 file->f_pos = 0;
842 break;
843 }
844
845 case OTPGETREGIONCOUNT:
846 case OTPGETREGIONINFO:
847 {
848 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
849 if (!buf)
850 return -ENOMEM;
851 ret = -EOPNOTSUPP;
852 switch (mfi->mode) {
853 case MTD_MODE_OTP_FACTORY:
854 if (mtd->get_fact_prot_info)
855 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
856 break;
857 case MTD_MODE_OTP_USER:
858 if (mtd->get_user_prot_info)
859 ret = mtd->get_user_prot_info(mtd, buf, 4096);
860 break;
861 default:
862 break;
863 }
864 if (ret >= 0) {
865 if (cmd == OTPGETREGIONCOUNT) {
866 int nbr = ret / sizeof(struct otp_info);
867 ret = copy_to_user(argp, &nbr, sizeof(int));
868 } else
869 ret = copy_to_user(argp, buf, ret);
870 if (ret)
871 ret = -EFAULT;
872 }
873 kfree(buf);
874 break;
875 }
876
877 case OTPLOCK:
878 {
879 struct otp_info oinfo;
880
881 if (mfi->mode != MTD_MODE_OTP_USER)
882 return -EINVAL;
883 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
884 return -EFAULT;
885 if (!mtd->lock_user_prot_reg)
886 return -EOPNOTSUPP;
887 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
888 break;
889 }
890 #endif
891
892 /* This ioctl is being deprecated - it truncates the ecc layout */
893 case ECCGETLAYOUT:
894 {
895 struct nand_ecclayout_user *usrlay;
896
897 if (!mtd->ecclayout)
898 return -EOPNOTSUPP;
899
900 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
901 if (!usrlay)
902 return -ENOMEM;
903
904 shrink_ecclayout(mtd->ecclayout, usrlay);
905
906 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
907 ret = -EFAULT;
908 kfree(usrlay);
909 break;
910 }
911
912 case ECCGETSTATS:
913 {
914 if (copy_to_user(argp, &mtd->ecc_stats,
915 sizeof(struct mtd_ecc_stats)))
916 return -EFAULT;
917 break;
918 }
919
920 case MTDFILEMODE:
921 {
922 mfi->mode = 0;
923
924 switch(arg) {
925 case MTD_MODE_OTP_FACTORY:
926 case MTD_MODE_OTP_USER:
927 ret = otp_select_filemode(mfi, arg);
928 break;
929
930 case MTD_MODE_RAW:
931 if (!mtd->read_oob || !mtd->write_oob)
932 return -EOPNOTSUPP;
933 mfi->mode = arg;
934
935 case MTD_MODE_NORMAL:
936 break;
937 default:
938 ret = -EINVAL;
939 }
940 file->f_pos = 0;
941 break;
942 }
943
944 #ifdef CONFIG_MTD_PARTITIONS
945 case BLKPG:
946 {
947 ret = mtd_blkpg_ioctl(mtd,
948 (struct blkpg_ioctl_arg __user *)arg);
949 break;
950 }
951
952 case BLKRRPART:
953 {
954 /* No reread partition feature. Just return ok */
955 ret = 0;
956 break;
957 }
958 #endif
959
960 default:
961 ret = -ENOTTY;
962 }
963
964 return ret;
965 } /* memory_ioctl */
966
967 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
968 {
969 int ret;
970
971 mutex_lock(&mtd_mutex);
972 ret = mtd_ioctl(file, cmd, arg);
973 mutex_unlock(&mtd_mutex);
974
975 return ret;
976 }
977
978 #ifdef CONFIG_COMPAT
979
980 struct mtd_oob_buf32 {
981 u_int32_t start;
982 u_int32_t length;
983 compat_caddr_t ptr; /* unsigned char* */
984 };
985
986 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
987 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
988
989 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
990 unsigned long arg)
991 {
992 struct mtd_file_info *mfi = file->private_data;
993 struct mtd_info *mtd = mfi->mtd;
994 void __user *argp = compat_ptr(arg);
995 int ret = 0;
996
997 mutex_lock(&mtd_mutex);
998
999 switch (cmd) {
1000 case MEMWRITEOOB32:
1001 {
1002 struct mtd_oob_buf32 buf;
1003 struct mtd_oob_buf32 __user *buf_user = argp;
1004
1005 if (copy_from_user(&buf, argp, sizeof(buf)))
1006 ret = -EFAULT;
1007 else
1008 ret = mtd_do_writeoob(file, mtd, buf.start,
1009 buf.length, compat_ptr(buf.ptr),
1010 &buf_user->length);
1011 break;
1012 }
1013
1014 case MEMREADOOB32:
1015 {
1016 struct mtd_oob_buf32 buf;
1017 struct mtd_oob_buf32 __user *buf_user = argp;
1018
1019 /* NOTE: writes return length to buf->start */
1020 if (copy_from_user(&buf, argp, sizeof(buf)))
1021 ret = -EFAULT;
1022 else
1023 ret = mtd_do_readoob(mtd, buf.start,
1024 buf.length, compat_ptr(buf.ptr),
1025 &buf_user->start);
1026 break;
1027 }
1028 default:
1029 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
1030 }
1031
1032 mutex_unlock(&mtd_mutex);
1033
1034 return ret;
1035 }
1036
1037 #endif /* CONFIG_COMPAT */
1038
1039 /*
1040 * try to determine where a shared mapping can be made
1041 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1042 * mappings)
1043 */
1044 #ifndef CONFIG_MMU
1045 static unsigned long mtd_get_unmapped_area(struct file *file,
1046 unsigned long addr,
1047 unsigned long len,
1048 unsigned long pgoff,
1049 unsigned long flags)
1050 {
1051 struct mtd_file_info *mfi = file->private_data;
1052 struct mtd_info *mtd = mfi->mtd;
1053
1054 if (mtd->get_unmapped_area) {
1055 unsigned long offset;
1056
1057 if (addr != 0)
1058 return (unsigned long) -EINVAL;
1059
1060 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1061 return (unsigned long) -EINVAL;
1062
1063 offset = pgoff << PAGE_SHIFT;
1064 if (offset > mtd->size - len)
1065 return (unsigned long) -EINVAL;
1066
1067 return mtd->get_unmapped_area(mtd, len, offset, flags);
1068 }
1069
1070 /* can't map directly */
1071 return (unsigned long) -ENOSYS;
1072 }
1073 #endif
1074
1075 /*
1076 * set up a mapping for shared memory segments
1077 */
1078 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
1079 {
1080 #ifdef CONFIG_MMU
1081 struct mtd_file_info *mfi = file->private_data;
1082 struct mtd_info *mtd = mfi->mtd;
1083 struct map_info *map = mtd->priv;
1084 unsigned long start;
1085 unsigned long off;
1086 u32 len;
1087
1088 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
1089 off = vma->vm_pgoff << PAGE_SHIFT;
1090 start = map->phys;
1091 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
1092 start &= PAGE_MASK;
1093 if ((vma->vm_end - vma->vm_start + off) > len)
1094 return -EINVAL;
1095
1096 off += start;
1097 vma->vm_pgoff = off >> PAGE_SHIFT;
1098 vma->vm_flags |= VM_IO | VM_RESERVED;
1099
1100 #ifdef pgprot_noncached
1101 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1102 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1103 #endif
1104 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1105 vma->vm_end - vma->vm_start,
1106 vma->vm_page_prot))
1107 return -EAGAIN;
1108
1109 return 0;
1110 }
1111 return -ENOSYS;
1112 #else
1113 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1114 #endif
1115 }
1116
1117 static const struct file_operations mtd_fops = {
1118 .owner = THIS_MODULE,
1119 .llseek = mtd_lseek,
1120 .read = mtd_read,
1121 .write = mtd_write,
1122 .unlocked_ioctl = mtd_unlocked_ioctl,
1123 #ifdef CONFIG_COMPAT
1124 .compat_ioctl = mtd_compat_ioctl,
1125 #endif
1126 .open = mtd_open,
1127 .release = mtd_close,
1128 .mmap = mtd_mmap,
1129 #ifndef CONFIG_MMU
1130 .get_unmapped_area = mtd_get_unmapped_area,
1131 #endif
1132 };
1133
1134 static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1135 int flags, const char *dev_name, void *data)
1136 {
1137 return mount_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC);
1138 }
1139
1140 static struct file_system_type mtd_inodefs_type = {
1141 .name = "mtd_inodefs",
1142 .mount = mtd_inodefs_mount,
1143 .kill_sb = kill_anon_super,
1144 };
1145
1146 static void mtdchar_notify_add(struct mtd_info *mtd)
1147 {
1148 }
1149
1150 static void mtdchar_notify_remove(struct mtd_info *mtd)
1151 {
1152 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1153
1154 if (mtd_ino) {
1155 /* Destroy the inode if it exists */
1156 mtd_ino->i_nlink = 0;
1157 iput(mtd_ino);
1158 }
1159 }
1160
1161 static struct mtd_notifier mtdchar_notifier = {
1162 .add = mtdchar_notify_add,
1163 .remove = mtdchar_notify_remove,
1164 };
1165
1166 static int __init init_mtdchar(void)
1167 {
1168 int ret;
1169
1170 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1171 "mtd", &mtd_fops);
1172 if (ret < 0) {
1173 pr_notice("Can't allocate major number %d for "
1174 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1175 return ret;
1176 }
1177
1178 ret = register_filesystem(&mtd_inodefs_type);
1179 if (ret) {
1180 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1181 goto err_unregister_chdev;
1182 }
1183
1184 mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1185 if (IS_ERR(mtd_inode_mnt)) {
1186 ret = PTR_ERR(mtd_inode_mnt);
1187 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1188 goto err_unregister_filesystem;
1189 }
1190 register_mtd_user(&mtdchar_notifier);
1191
1192 return ret;
1193
1194 err_unregister_filesystem:
1195 unregister_filesystem(&mtd_inodefs_type);
1196 err_unregister_chdev:
1197 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1198 return ret;
1199 }
1200
1201 static void __exit cleanup_mtdchar(void)
1202 {
1203 unregister_mtd_user(&mtdchar_notifier);
1204 mntput_long(mtd_inode_mnt);
1205 unregister_filesystem(&mtd_inodefs_type);
1206 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1207 }
1208
1209 module_init(init_mtdchar);
1210 module_exit(cleanup_mtdchar);
1211
1212 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1213
1214 MODULE_LICENSE("GPL");
1215 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1216 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1217 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
linux-next