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Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/upstream-linus
[linux-btrfs-devel.git] / drivers / mtd / mtdchar.c
blobf1af2228a1b1ec2e90ee2cb19958a68f0d7bb0da
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 /* Back in June 2001, dwmw2 wrote:
170 *
171 * FIXME: This _really_ needs to die. In 2.5, we should lock the
172 * userspace buffer down and use it directly with readv/writev.
173 *
174 * The implementation below, using mtd_kmalloc_up_to, mitigates
175 * allocation failures when the system is under low-memory situations
176 * or if memory is highly fragmented at the cost of reducing the
177 * performance of the requested transfer due to a smaller buffer size.
178 *
179 * A more complex but more memory-efficient implementation based on
180 * get_user_pages and iovecs to cover extents of those pages is a
181 * longer-term goal, as intimated by dwmw2 above. However, for the
182 * write case, this requires yet more complex head and tail transfer
183 * handling when those head and tail offsets and sizes are such that
184 * alignment requirements are not met in the NAND subdriver.
185 */
186
187 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
188 {
189 struct mtd_file_info *mfi = file->private_data;
190 struct mtd_info *mtd = mfi->mtd;
191 size_t retlen=0;
192 size_t total_retlen=0;
193 int ret=0;
194 int len;
195 size_t size = count;
196 char *kbuf;
197
198 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
199
200 if (*ppos + count > mtd->size)
201 count = mtd->size - *ppos;
202
203 if (!count)
204 return 0;
205
206 kbuf = mtd_kmalloc_up_to(mtd, &size);
207 if (!kbuf)
208 return -ENOMEM;
209
210 while (count) {
211 len = min_t(size_t, count, size);
212
213 switch (mfi->mode) {
214 case MTD_MODE_OTP_FACTORY:
215 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
216 break;
217 case MTD_MODE_OTP_USER:
218 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
219 break;
220 case MTD_MODE_RAW:
221 {
222 struct mtd_oob_ops ops;
223
224 ops.mode = MTD_OOB_RAW;
225 ops.datbuf = kbuf;
226 ops.oobbuf = NULL;
227 ops.len = len;
228
229 ret = mtd->read_oob(mtd, *ppos, &ops);
230 retlen = ops.retlen;
231 break;
232 }
233 default:
234 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
235 }
236 /* Nand returns -EBADMSG on ecc errors, but it returns
237 * the data. For our userspace tools it is important
238 * to dump areas with ecc errors !
239 * For kernel internal usage it also might return -EUCLEAN
240 * to signal the caller that a bitflip has occurred and has
241 * been corrected by the ECC algorithm.
242 * Userspace software which accesses NAND this way
243 * must be aware of the fact that it deals with NAND
244 */
245 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
246 *ppos += retlen;
247 if (copy_to_user(buf, kbuf, retlen)) {
248 kfree(kbuf);
249 return -EFAULT;
250 }
251 else
252 total_retlen += retlen;
253
254 count -= retlen;
255 buf += retlen;
256 if (retlen == 0)
257 count = 0;
258 }
259 else {
260 kfree(kbuf);
261 return ret;
262 }
263
264 }
265
266 kfree(kbuf);
267 return total_retlen;
268 } /* mtd_read */
269
270 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
271 {
272 struct mtd_file_info *mfi = file->private_data;
273 struct mtd_info *mtd = mfi->mtd;
274 size_t size = count;
275 char *kbuf;
276 size_t retlen;
277 size_t total_retlen=0;
278 int ret=0;
279 int len;
280
281 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
282
283 if (*ppos == mtd->size)
284 return -ENOSPC;
285
286 if (*ppos + count > mtd->size)
287 count = mtd->size - *ppos;
288
289 if (!count)
290 return 0;
291
292 kbuf = mtd_kmalloc_up_to(mtd, &size);
293 if (!kbuf)
294 return -ENOMEM;
295
296 while (count) {
297 len = min_t(size_t, count, size);
298
299 if (copy_from_user(kbuf, buf, len)) {
300 kfree(kbuf);
301 return -EFAULT;
302 }
303
304 switch (mfi->mode) {
305 case MTD_MODE_OTP_FACTORY:
306 ret = -EROFS;
307 break;
308 case MTD_MODE_OTP_USER:
309 if (!mtd->write_user_prot_reg) {
310 ret = -EOPNOTSUPP;
311 break;
312 }
313 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
314 break;
315
316 case MTD_MODE_RAW:
317 {
318 struct mtd_oob_ops ops;
319
320 ops.mode = MTD_OOB_RAW;
321 ops.datbuf = kbuf;
322 ops.oobbuf = NULL;
323 ops.len = len;
324
325 ret = mtd->write_oob(mtd, *ppos, &ops);
326 retlen = ops.retlen;
327 break;
328 }
329
330 default:
331 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
332 }
333 if (!ret) {
334 *ppos += retlen;
335 total_retlen += retlen;
336 count -= retlen;
337 buf += retlen;
338 }
339 else {
340 kfree(kbuf);
341 return ret;
342 }
343 }
344
345 kfree(kbuf);
346 return total_retlen;
347 } /* mtd_write */
348
349 /*======================================================================
350
351 IOCTL calls for getting device parameters.
352
353 ======================================================================*/
354 static void mtdchar_erase_callback (struct erase_info *instr)
355 {
356 wake_up((wait_queue_head_t *)instr->priv);
357 }
358
359 #ifdef CONFIG_HAVE_MTD_OTP
360 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
361 {
362 struct mtd_info *mtd = mfi->mtd;
363 int ret = 0;
364
365 switch (mode) {
366 case MTD_OTP_FACTORY:
367 if (!mtd->read_fact_prot_reg)
368 ret = -EOPNOTSUPP;
369 else
370 mfi->mode = MTD_MODE_OTP_FACTORY;
371 break;
372 case MTD_OTP_USER:
373 if (!mtd->read_fact_prot_reg)
374 ret = -EOPNOTSUPP;
375 else
376 mfi->mode = MTD_MODE_OTP_USER;
377 break;
378 default:
379 ret = -EINVAL;
380 case MTD_OTP_OFF:
381 break;
382 }
383 return ret;
384 }
385 #else
386 # define otp_select_filemode(f,m) -EOPNOTSUPP
387 #endif
388
389 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
390 uint64_t start, uint32_t length, void __user *ptr,
391 uint32_t __user *retp)
392 {
393 struct mtd_oob_ops ops;
394 uint32_t retlen;
395 int ret = 0;
396
397 if (!(file->f_mode & FMODE_WRITE))
398 return -EPERM;
399
400 if (length > 4096)
401 return -EINVAL;
402
403 if (!mtd->write_oob)
404 ret = -EOPNOTSUPP;
405 else
406 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
407
408 if (ret)
409 return ret;
410
411 ops.ooblen = length;
412 ops.ooboffs = start & (mtd->oobsize - 1);
413 ops.datbuf = NULL;
414 ops.mode = MTD_OOB_PLACE;
415
416 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
417 return -EINVAL;
418
419 ops.oobbuf = memdup_user(ptr, length);
420 if (IS_ERR(ops.oobbuf))
421 return PTR_ERR(ops.oobbuf);
422
423 start &= ~((uint64_t)mtd->oobsize - 1);
424 ret = mtd->write_oob(mtd, start, &ops);
425
426 if (ops.oobretlen > 0xFFFFFFFFU)
427 ret = -EOVERFLOW;
428 retlen = ops.oobretlen;
429 if (copy_to_user(retp, &retlen, sizeof(length)))
430 ret = -EFAULT;
431
432 kfree(ops.oobbuf);
433 return ret;
434 }
435
436 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
437 uint32_t length, void __user *ptr, uint32_t __user *retp)
438 {
439 struct mtd_oob_ops ops;
440 int ret = 0;
441
442 if (length > 4096)
443 return -EINVAL;
444
445 if (!mtd->read_oob)
446 ret = -EOPNOTSUPP;
447 else
448 ret = access_ok(VERIFY_WRITE, ptr,
449 length) ? 0 : -EFAULT;
450 if (ret)
451 return ret;
452
453 ops.ooblen = length;
454 ops.ooboffs = start & (mtd->oobsize - 1);
455 ops.datbuf = NULL;
456 ops.mode = MTD_OOB_PLACE;
457
458 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
459 return -EINVAL;
460
461 ops.oobbuf = kmalloc(length, GFP_KERNEL);
462 if (!ops.oobbuf)
463 return -ENOMEM;
464
465 start &= ~((uint64_t)mtd->oobsize - 1);
466 ret = mtd->read_oob(mtd, start, &ops);
467
468 if (put_user(ops.oobretlen, retp))
469 ret = -EFAULT;
470 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
471 ops.oobretlen))
472 ret = -EFAULT;
473
474 kfree(ops.oobbuf);
475 return ret;
476 }
477
478 /*
479 * Copies (and truncates, if necessary) data from the larger struct,
480 * nand_ecclayout, to the smaller, deprecated layout struct,
481 * nand_ecclayout_user. This is necessary only to suppport the deprecated
482 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
483 * nand_ecclayout flexibly (i.e. the struct may change size in new
484 * releases without requiring major rewrites).
485 */
486 static int shrink_ecclayout(const struct nand_ecclayout *from,
487 struct nand_ecclayout_user *to)
488 {
489 int i;
490
491 if (!from || !to)
492 return -EINVAL;
493
494 memset(to, 0, sizeof(*to));
495
496 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
497 for (i = 0; i < to->eccbytes; i++)
498 to->eccpos[i] = from->eccpos[i];
499
500 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
501 if (from->oobfree[i].length == 0 &&
502 from->oobfree[i].offset == 0)
503 break;
504 to->oobavail += from->oobfree[i].length;
505 to->oobfree[i] = from->oobfree[i];
506 }
507
508 return 0;
509 }
510
511 static int mtd_blkpg_ioctl(struct mtd_info *mtd,
512 struct blkpg_ioctl_arg __user *arg)
513 {
514 struct blkpg_ioctl_arg a;
515 struct blkpg_partition p;
516
517 if (!capable(CAP_SYS_ADMIN))
518 return -EPERM;
519
520 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
521 return -EFAULT;
522
523 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
524 return -EFAULT;
525
526 switch (a.op) {
527 case BLKPG_ADD_PARTITION:
528
529 /* Only master mtd device must be used to add partitions */
530 if (mtd_is_partition(mtd))
531 return -EINVAL;
532
533 return mtd_add_partition(mtd, p.devname, p.start, p.length);
534
535 case BLKPG_DEL_PARTITION:
536
537 if (p.pno < 0)
538 return -EINVAL;
539
540 return mtd_del_partition(mtd, p.pno);
541
542 default:
543 return -EINVAL;
544 }
545 }
546
547 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
548 {
549 struct mtd_file_info *mfi = file->private_data;
550 struct mtd_info *mtd = mfi->mtd;
551 void __user *argp = (void __user *)arg;
552 int ret = 0;
553 u_long size;
554 struct mtd_info_user info;
555
556 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
557
558 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
559 if (cmd & IOC_IN) {
560 if (!access_ok(VERIFY_READ, argp, size))
561 return -EFAULT;
562 }
563 if (cmd & IOC_OUT) {
564 if (!access_ok(VERIFY_WRITE, argp, size))
565 return -EFAULT;
566 }
567
568 switch (cmd) {
569 case MEMGETREGIONCOUNT:
570 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
571 return -EFAULT;
572 break;
573
574 case MEMGETREGIONINFO:
575 {
576 uint32_t ur_idx;
577 struct mtd_erase_region_info *kr;
578 struct region_info_user __user *ur = argp;
579
580 if (get_user(ur_idx, &(ur->regionindex)))
581 return -EFAULT;
582
583 if (ur_idx >= mtd->numeraseregions)
584 return -EINVAL;
585
586 kr = &(mtd->eraseregions[ur_idx]);
587
588 if (put_user(kr->offset, &(ur->offset))
589 || put_user(kr->erasesize, &(ur->erasesize))
590 || put_user(kr->numblocks, &(ur->numblocks)))
591 return -EFAULT;
592
593 break;
594 }
595
596 case MEMGETINFO:
597 memset(&info, 0, sizeof(info));
598 info.type = mtd->type;
599 info.flags = mtd->flags;
600 info.size = mtd->size;
601 info.erasesize = mtd->erasesize;
602 info.writesize = mtd->writesize;
603 info.oobsize = mtd->oobsize;
604 /* The below fields are obsolete */
605 info.ecctype = -1;
606 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
607 return -EFAULT;
608 break;
609
610 case MEMERASE:
611 case MEMERASE64:
612 {
613 struct erase_info *erase;
614
615 if(!(file->f_mode & FMODE_WRITE))
616 return -EPERM;
617
618 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
619 if (!erase)
620 ret = -ENOMEM;
621 else {
622 wait_queue_head_t waitq;
623 DECLARE_WAITQUEUE(wait, current);
624
625 init_waitqueue_head(&waitq);
626
627 if (cmd == MEMERASE64) {
628 struct erase_info_user64 einfo64;
629
630 if (copy_from_user(&einfo64, argp,
631 sizeof(struct erase_info_user64))) {
632 kfree(erase);
633 return -EFAULT;
634 }
635 erase->addr = einfo64.start;
636 erase->len = einfo64.length;
637 } else {
638 struct erase_info_user einfo32;
639
640 if (copy_from_user(&einfo32, argp,
641 sizeof(struct erase_info_user))) {
642 kfree(erase);
643 return -EFAULT;
644 }
645 erase->addr = einfo32.start;
646 erase->len = einfo32.length;
647 }
648 erase->mtd = mtd;
649 erase->callback = mtdchar_erase_callback;
650 erase->priv = (unsigned long)&waitq;
651
652 /*
653 FIXME: Allow INTERRUPTIBLE. Which means
654 not having the wait_queue head on the stack.
655
656 If the wq_head is on the stack, and we
657 leave because we got interrupted, then the
658 wq_head is no longer there when the
659 callback routine tries to wake us up.
660 */
661 ret = mtd->erase(mtd, erase);
662 if (!ret) {
663 set_current_state(TASK_UNINTERRUPTIBLE);
664 add_wait_queue(&waitq, &wait);
665 if (erase->state != MTD_ERASE_DONE &&
666 erase->state != MTD_ERASE_FAILED)
667 schedule();
668 remove_wait_queue(&waitq, &wait);
669 set_current_state(TASK_RUNNING);
670
671 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
672 }
673 kfree(erase);
674 }
675 break;
676 }
677
678 case MEMWRITEOOB:
679 {
680 struct mtd_oob_buf buf;
681 struct mtd_oob_buf __user *buf_user = argp;
682
683 /* NOTE: writes return length to buf_user->length */
684 if (copy_from_user(&buf, argp, sizeof(buf)))
685 ret = -EFAULT;
686 else
687 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
688 buf.ptr, &buf_user->length);
689 break;
690 }
691
692 case MEMREADOOB:
693 {
694 struct mtd_oob_buf buf;
695 struct mtd_oob_buf __user *buf_user = argp;
696
697 /* NOTE: writes return length to buf_user->start */
698 if (copy_from_user(&buf, argp, sizeof(buf)))
699 ret = -EFAULT;
700 else
701 ret = mtd_do_readoob(mtd, buf.start, buf.length,
702 buf.ptr, &buf_user->start);
703 break;
704 }
705
706 case MEMWRITEOOB64:
707 {
708 struct mtd_oob_buf64 buf;
709 struct mtd_oob_buf64 __user *buf_user = argp;
710
711 if (copy_from_user(&buf, argp, sizeof(buf)))
712 ret = -EFAULT;
713 else
714 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
715 (void __user *)(uintptr_t)buf.usr_ptr,
716 &buf_user->length);
717 break;
718 }
719
720 case MEMREADOOB64:
721 {
722 struct mtd_oob_buf64 buf;
723 struct mtd_oob_buf64 __user *buf_user = argp;
724
725 if (copy_from_user(&buf, argp, sizeof(buf)))
726 ret = -EFAULT;
727 else
728 ret = mtd_do_readoob(mtd, buf.start, buf.length,
729 (void __user *)(uintptr_t)buf.usr_ptr,
730 &buf_user->length);
731 break;
732 }
733
734 case MEMLOCK:
735 {
736 struct erase_info_user einfo;
737
738 if (copy_from_user(&einfo, argp, sizeof(einfo)))
739 return -EFAULT;
740
741 if (!mtd->lock)
742 ret = -EOPNOTSUPP;
743 else
744 ret = mtd->lock(mtd, einfo.start, einfo.length);
745 break;
746 }
747
748 case MEMUNLOCK:
749 {
750 struct erase_info_user einfo;
751
752 if (copy_from_user(&einfo, argp, sizeof(einfo)))
753 return -EFAULT;
754
755 if (!mtd->unlock)
756 ret = -EOPNOTSUPP;
757 else
758 ret = mtd->unlock(mtd, einfo.start, einfo.length);
759 break;
760 }
761
762 case MEMISLOCKED:
763 {
764 struct erase_info_user einfo;
765
766 if (copy_from_user(&einfo, argp, sizeof(einfo)))
767 return -EFAULT;
768
769 if (!mtd->is_locked)
770 ret = -EOPNOTSUPP;
771 else
772 ret = mtd->is_locked(mtd, einfo.start, einfo.length);
773 break;
774 }
775
776 /* Legacy interface */
777 case MEMGETOOBSEL:
778 {
779 struct nand_oobinfo oi;
780
781 if (!mtd->ecclayout)
782 return -EOPNOTSUPP;
783 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
784 return -EINVAL;
785
786 oi.useecc = MTD_NANDECC_AUTOPLACE;
787 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
788 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
789 sizeof(oi.oobfree));
790 oi.eccbytes = mtd->ecclayout->eccbytes;
791
792 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
793 return -EFAULT;
794 break;
795 }
796
797 case MEMGETBADBLOCK:
798 {
799 loff_t offs;
800
801 if (copy_from_user(&offs, argp, sizeof(loff_t)))
802 return -EFAULT;
803 if (!mtd->block_isbad)
804 ret = -EOPNOTSUPP;
805 else
806 return mtd->block_isbad(mtd, offs);
807 break;
808 }
809
810 case MEMSETBADBLOCK:
811 {
812 loff_t offs;
813
814 if (copy_from_user(&offs, argp, sizeof(loff_t)))
815 return -EFAULT;
816 if (!mtd->block_markbad)
817 ret = -EOPNOTSUPP;
818 else
819 return mtd->block_markbad(mtd, offs);
820 break;
821 }
822
823 #ifdef CONFIG_HAVE_MTD_OTP
824 case OTPSELECT:
825 {
826 int mode;
827 if (copy_from_user(&mode, argp, sizeof(int)))
828 return -EFAULT;
829
830 mfi->mode = MTD_MODE_NORMAL;
831
832 ret = otp_select_filemode(mfi, mode);
833
834 file->f_pos = 0;
835 break;
836 }
837
838 case OTPGETREGIONCOUNT:
839 case OTPGETREGIONINFO:
840 {
841 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
842 if (!buf)
843 return -ENOMEM;
844 ret = -EOPNOTSUPP;
845 switch (mfi->mode) {
846 case MTD_MODE_OTP_FACTORY:
847 if (mtd->get_fact_prot_info)
848 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
849 break;
850 case MTD_MODE_OTP_USER:
851 if (mtd->get_user_prot_info)
852 ret = mtd->get_user_prot_info(mtd, buf, 4096);
853 break;
854 default:
855 break;
856 }
857 if (ret >= 0) {
858 if (cmd == OTPGETREGIONCOUNT) {
859 int nbr = ret / sizeof(struct otp_info);
860 ret = copy_to_user(argp, &nbr, sizeof(int));
861 } else
862 ret = copy_to_user(argp, buf, ret);
863 if (ret)
864 ret = -EFAULT;
865 }
866 kfree(buf);
867 break;
868 }
869
870 case OTPLOCK:
871 {
872 struct otp_info oinfo;
873
874 if (mfi->mode != MTD_MODE_OTP_USER)
875 return -EINVAL;
876 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
877 return -EFAULT;
878 if (!mtd->lock_user_prot_reg)
879 return -EOPNOTSUPP;
880 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
881 break;
882 }
883 #endif
884
885 /* This ioctl is being deprecated - it truncates the ecc layout */
886 case ECCGETLAYOUT:
887 {
888 struct nand_ecclayout_user *usrlay;
889
890 if (!mtd->ecclayout)
891 return -EOPNOTSUPP;
892
893 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
894 if (!usrlay)
895 return -ENOMEM;
896
897 shrink_ecclayout(mtd->ecclayout, usrlay);
898
899 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
900 ret = -EFAULT;
901 kfree(usrlay);
902 break;
903 }
904
905 case ECCGETSTATS:
906 {
907 if (copy_to_user(argp, &mtd->ecc_stats,
908 sizeof(struct mtd_ecc_stats)))
909 return -EFAULT;
910 break;
911 }
912
913 case MTDFILEMODE:
914 {
915 mfi->mode = 0;
916
917 switch(arg) {
918 case MTD_MODE_OTP_FACTORY:
919 case MTD_MODE_OTP_USER:
920 ret = otp_select_filemode(mfi, arg);
921 break;
922
923 case MTD_MODE_RAW:
924 if (!mtd->read_oob || !mtd->write_oob)
925 return -EOPNOTSUPP;
926 mfi->mode = arg;
927
928 case MTD_MODE_NORMAL:
929 break;
930 default:
931 ret = -EINVAL;
932 }
933 file->f_pos = 0;
934 break;
935 }
936
937 case BLKPG:
938 {
939 ret = mtd_blkpg_ioctl(mtd,
940 (struct blkpg_ioctl_arg __user *)arg);
941 break;
942 }
943
944 case BLKRRPART:
945 {
946 /* No reread partition feature. Just return ok */
947 ret = 0;
948 break;
949 }
950
951 default:
952 ret = -ENOTTY;
953 }
954
955 return ret;
956 } /* memory_ioctl */
957
958 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
959 {
960 int ret;
961
962 mutex_lock(&mtd_mutex);
963 ret = mtd_ioctl(file, cmd, arg);
964 mutex_unlock(&mtd_mutex);
965
966 return ret;
967 }
968
969 #ifdef CONFIG_COMPAT
970
971 struct mtd_oob_buf32 {
972 u_int32_t start;
973 u_int32_t length;
974 compat_caddr_t ptr; /* unsigned char* */
975 };
976
977 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
978 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
979
980 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
981 unsigned long arg)
982 {
983 struct mtd_file_info *mfi = file->private_data;
984 struct mtd_info *mtd = mfi->mtd;
985 void __user *argp = compat_ptr(arg);
986 int ret = 0;
987
988 mutex_lock(&mtd_mutex);
989
990 switch (cmd) {
991 case MEMWRITEOOB32:
992 {
993 struct mtd_oob_buf32 buf;
994 struct mtd_oob_buf32 __user *buf_user = argp;
995
996 if (copy_from_user(&buf, argp, sizeof(buf)))
997 ret = -EFAULT;
998 else
999 ret = mtd_do_writeoob(file, mtd, buf.start,
1000 buf.length, compat_ptr(buf.ptr),
1001 &buf_user->length);
1002 break;
1003 }
1004
1005 case MEMREADOOB32:
1006 {
1007 struct mtd_oob_buf32 buf;
1008 struct mtd_oob_buf32 __user *buf_user = argp;
1009
1010 /* NOTE: writes return length to buf->start */
1011 if (copy_from_user(&buf, argp, sizeof(buf)))
1012 ret = -EFAULT;
1013 else
1014 ret = mtd_do_readoob(mtd, buf.start,
1015 buf.length, compat_ptr(buf.ptr),
1016 &buf_user->start);
1017 break;
1018 }
1019 default:
1020 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
1021 }
1022
1023 mutex_unlock(&mtd_mutex);
1024
1025 return ret;
1026 }
1027
1028 #endif /* CONFIG_COMPAT */
1029
1030 /*
1031 * try to determine where a shared mapping can be made
1032 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1033 * mappings)
1034 */
1035 #ifndef CONFIG_MMU
1036 static unsigned long mtd_get_unmapped_area(struct file *file,
1037 unsigned long addr,
1038 unsigned long len,
1039 unsigned long pgoff,
1040 unsigned long flags)
1041 {
1042 struct mtd_file_info *mfi = file->private_data;
1043 struct mtd_info *mtd = mfi->mtd;
1044
1045 if (mtd->get_unmapped_area) {
1046 unsigned long offset;
1047
1048 if (addr != 0)
1049 return (unsigned long) -EINVAL;
1050
1051 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1052 return (unsigned long) -EINVAL;
1053
1054 offset = pgoff << PAGE_SHIFT;
1055 if (offset > mtd->size - len)
1056 return (unsigned long) -EINVAL;
1057
1058 return mtd->get_unmapped_area(mtd, len, offset, flags);
1059 }
1060
1061 /* can't map directly */
1062 return (unsigned long) -ENOSYS;
1063 }
1064 #endif
1065
1066 /*
1067 * set up a mapping for shared memory segments
1068 */
1069 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
1070 {
1071 #ifdef CONFIG_MMU
1072 struct mtd_file_info *mfi = file->private_data;
1073 struct mtd_info *mtd = mfi->mtd;
1074 struct map_info *map = mtd->priv;
1075 unsigned long start;
1076 unsigned long off;
1077 u32 len;
1078
1079 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
1080 off = vma->vm_pgoff << PAGE_SHIFT;
1081 start = map->phys;
1082 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
1083 start &= PAGE_MASK;
1084 if ((vma->vm_end - vma->vm_start + off) > len)
1085 return -EINVAL;
1086
1087 off += start;
1088 vma->vm_pgoff = off >> PAGE_SHIFT;
1089 vma->vm_flags |= VM_IO | VM_RESERVED;
1090
1091 #ifdef pgprot_noncached
1092 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1093 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1094 #endif
1095 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1096 vma->vm_end - vma->vm_start,
1097 vma->vm_page_prot))
1098 return -EAGAIN;
1099
1100 return 0;
1101 }
1102 return -ENOSYS;
1103 #else
1104 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1105 #endif
1106 }
1107
1108 static const struct file_operations mtd_fops = {
1109 .owner = THIS_MODULE,
1110 .llseek = mtd_lseek,
1111 .read = mtd_read,
1112 .write = mtd_write,
1113 .unlocked_ioctl = mtd_unlocked_ioctl,
1114 #ifdef CONFIG_COMPAT
1115 .compat_ioctl = mtd_compat_ioctl,
1116 #endif
1117 .open = mtd_open,
1118 .release = mtd_close,
1119 .mmap = mtd_mmap,
1120 #ifndef CONFIG_MMU
1121 .get_unmapped_area = mtd_get_unmapped_area,
1122 #endif
1123 };
1124
1125 static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1126 int flags, const char *dev_name, void *data)
1127 {
1128 return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC);
1129 }
1130
1131 static struct file_system_type mtd_inodefs_type = {
1132 .name = "mtd_inodefs",
1133 .mount = mtd_inodefs_mount,
1134 .kill_sb = kill_anon_super,
1135 };
1136
1137 static void mtdchar_notify_add(struct mtd_info *mtd)
1138 {
1139 }
1140
1141 static void mtdchar_notify_remove(struct mtd_info *mtd)
1142 {
1143 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1144
1145 if (mtd_ino) {
1146 /* Destroy the inode if it exists */
1147 mtd_ino->i_nlink = 0;
1148 iput(mtd_ino);
1149 }
1150 }
1151
1152 static struct mtd_notifier mtdchar_notifier = {
1153 .add = mtdchar_notify_add,
1154 .remove = mtdchar_notify_remove,
1155 };
1156
1157 static int __init init_mtdchar(void)
1158 {
1159 int ret;
1160
1161 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1162 "mtd", &mtd_fops);
1163 if (ret < 0) {
1164 pr_notice("Can't allocate major number %d for "
1165 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1166 return ret;
1167 }
1168
1169 ret = register_filesystem(&mtd_inodefs_type);
1170 if (ret) {
1171 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1172 goto err_unregister_chdev;
1173 }
1174
1175 mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1176 if (IS_ERR(mtd_inode_mnt)) {
1177 ret = PTR_ERR(mtd_inode_mnt);
1178 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1179 goto err_unregister_filesystem;
1180 }
1181 register_mtd_user(&mtdchar_notifier);
1182
1183 return ret;
1184
1185 err_unregister_filesystem:
1186 unregister_filesystem(&mtd_inodefs_type);
1187 err_unregister_chdev:
1188 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1189 return ret;
1190 }
1191
1192 static void __exit cleanup_mtdchar(void)
1193 {
1194 unregister_mtd_user(&mtdchar_notifier);
1195 kern_unmount(mtd_inode_mnt);
1196 unregister_filesystem(&mtd_inodefs_type);
1197 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1198 }
1199
1200 module_init(init_mtdchar);
1201 module_exit(cleanup_mtdchar);
1202
1203 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1204
1205 MODULE_LICENSE("GPL");
1206 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1207 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1208 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
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