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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
4 */
5
6#include <linux/device.h>
7#include <linux/fs.h>
8#include <linux/mm.h>
9#include <linux/err.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/sched.h>
15#include <linux/mutex.h>
16#include <linux/backing-dev.h>
17#include <linux/compat.h>
18#include <linux/mount.h>
19#include <linux/blkpg.h>
20#include <linux/magic.h>
21#include <linux/major.h>
22#include <linux/mtd/mtd.h>
23#include <linux/mtd/partitions.h>
24#include <linux/mtd/map.h>
25
26#include <linux/uaccess.h>
27
28#include "mtdcore.h"
29
30static DEFINE_MUTEX(mtd_mutex);
31
32/*
33 * Data structure to hold the pointer to the mtd device as well
34 * as mode information of various use cases.
35 */
36struct mtd_file_info {
37 struct mtd_info *mtd;
38 enum mtd_file_modes mode;
39};
40
41static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
42{
43 struct mtd_file_info *mfi = file->private_data;
44 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
45}
46
47static int mtdchar_open(struct inode *inode, struct file *file)
48{
49 int minor = iminor(inode);
50 int devnum = minor >> 1;
51 int ret = 0;
52 struct mtd_info *mtd;
53 struct mtd_file_info *mfi;
54
55 pr_debug("MTD_open\n");
56
57 /* You can't open the RO devices RW */
58 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
59 return -EACCES;
60
61 mutex_lock(&mtd_mutex);
62 mtd = get_mtd_device(NULL, devnum);
63
64 if (IS_ERR(mtd)) {
65 ret = PTR_ERR(mtd);
66 goto out;
67 }
68
69 if (mtd->type == MTD_ABSENT) {
70 ret = -ENODEV;
71 goto out1;
72 }
73
74 /* You can't open it RW if it's not a writeable device */
75 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
76 ret = -EACCES;
77 goto out1;
78 }
79
80 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
81 if (!mfi) {
82 ret = -ENOMEM;
83 goto out1;
84 }
85 mfi->mtd = mtd;
86 file->private_data = mfi;
87 mutex_unlock(&mtd_mutex);
88 return 0;
89
90out1:
91 put_mtd_device(mtd);
92out:
93 mutex_unlock(&mtd_mutex);
94 return ret;
95} /* mtdchar_open */
96
97/*====================================================================*/
98
99static int mtdchar_close(struct inode *inode, struct file *file)
100{
101 struct mtd_file_info *mfi = file->private_data;
102 struct mtd_info *mtd = mfi->mtd;
103
104 pr_debug("MTD_close\n");
105
106 /* Only sync if opened RW */
107 if ((file->f_mode & FMODE_WRITE))
108 mtd_sync(mtd);
109
110 put_mtd_device(mtd);
111 file->private_data = NULL;
112 kfree(mfi);
113
114 return 0;
115} /* mtdchar_close */
116
117/* Back in June 2001, dwmw2 wrote:
118 *
119 * FIXME: This _really_ needs to die. In 2.5, we should lock the
120 * userspace buffer down and use it directly with readv/writev.
121 *
122 * The implementation below, using mtd_kmalloc_up_to, mitigates
123 * allocation failures when the system is under low-memory situations
124 * or if memory is highly fragmented at the cost of reducing the
125 * performance of the requested transfer due to a smaller buffer size.
126 *
127 * A more complex but more memory-efficient implementation based on
128 * get_user_pages and iovecs to cover extents of those pages is a
129 * longer-term goal, as intimated by dwmw2 above. However, for the
130 * write case, this requires yet more complex head and tail transfer
131 * handling when those head and tail offsets and sizes are such that
132 * alignment requirements are not met in the NAND subdriver.
133 */
134
135static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
136 loff_t *ppos)
137{
138 struct mtd_file_info *mfi = file->private_data;
139 struct mtd_info *mtd = mfi->mtd;
140 size_t retlen;
141 size_t total_retlen=0;
142 int ret=0;
143 int len;
144 size_t size = count;
145 char *kbuf;
146
147 pr_debug("MTD_read\n");
148
149 if (*ppos + count > mtd->size) {
150 if (*ppos < mtd->size)
151 count = mtd->size - *ppos;
152 else
153 count = 0;
154 }
155
156 if (!count)
157 return 0;
158
159 kbuf = mtd_kmalloc_up_to(mtd, &size);
160 if (!kbuf)
161 return -ENOMEM;
162
163 while (count) {
164 len = min_t(size_t, count, size);
165
166 switch (mfi->mode) {
167 case MTD_FILE_MODE_OTP_FACTORY:
168 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
169 &retlen, kbuf);
170 break;
171 case MTD_FILE_MODE_OTP_USER:
172 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
173 &retlen, kbuf);
174 break;
175 case MTD_FILE_MODE_RAW:
176 {
177 struct mtd_oob_ops ops;
178
179 ops.mode = MTD_OPS_RAW;
180 ops.datbuf = kbuf;
181 ops.oobbuf = NULL;
182 ops.len = len;
183
184 ret = mtd_read_oob(mtd, *ppos, &ops);
185 retlen = ops.retlen;
186 break;
187 }
188 default:
189 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
190 }
191 /* Nand returns -EBADMSG on ECC errors, but it returns
192 * the data. For our userspace tools it is important
193 * to dump areas with ECC errors!
194 * For kernel internal usage it also might return -EUCLEAN
195 * to signal the caller that a bitflip has occurred and has
196 * been corrected by the ECC algorithm.
197 * Userspace software which accesses NAND this way
198 * must be aware of the fact that it deals with NAND
199 */
200 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
201 *ppos += retlen;
202 if (copy_to_user(buf, kbuf, retlen)) {
203 kfree(kbuf);
204 return -EFAULT;
205 }
206 else
207 total_retlen += retlen;
208
209 count -= retlen;
210 buf += retlen;
211 if (retlen == 0)
212 count = 0;
213 }
214 else {
215 kfree(kbuf);
216 return ret;
217 }
218
219 }
220
221 kfree(kbuf);
222 return total_retlen;
223} /* mtdchar_read */
224
225static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
226 loff_t *ppos)
227{
228 struct mtd_file_info *mfi = file->private_data;
229 struct mtd_info *mtd = mfi->mtd;
230 size_t size = count;
231 char *kbuf;
232 size_t retlen;
233 size_t total_retlen=0;
234 int ret=0;
235 int len;
236
237 pr_debug("MTD_write\n");
238
239 if (*ppos >= mtd->size)
240 return -ENOSPC;
241
242 if (*ppos + count > mtd->size)
243 count = mtd->size - *ppos;
244
245 if (!count)
246 return 0;
247
248 kbuf = mtd_kmalloc_up_to(mtd, &size);
249 if (!kbuf)
250 return -ENOMEM;
251
252 while (count) {
253 len = min_t(size_t, count, size);
254
255 if (copy_from_user(kbuf, buf, len)) {
256 kfree(kbuf);
257 return -EFAULT;
258 }
259
260 switch (mfi->mode) {
261 case MTD_FILE_MODE_OTP_FACTORY:
262 ret = -EROFS;
263 break;
264 case MTD_FILE_MODE_OTP_USER:
265 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
266 &retlen, kbuf);
267 break;
268
269 case MTD_FILE_MODE_RAW:
270 {
271 struct mtd_oob_ops ops;
272
273 ops.mode = MTD_OPS_RAW;
274 ops.datbuf = kbuf;
275 ops.oobbuf = NULL;
276 ops.ooboffs = 0;
277 ops.len = len;
278
279 ret = mtd_write_oob(mtd, *ppos, &ops);
280 retlen = ops.retlen;
281 break;
282 }
283
284 default:
285 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
286 }
287
288 /*
289 * Return -ENOSPC only if no data could be written at all.
290 * Otherwise just return the number of bytes that actually
291 * have been written.
292 */
293 if ((ret == -ENOSPC) && (total_retlen))
294 break;
295
296 if (!ret) {
297 *ppos += retlen;
298 total_retlen += retlen;
299 count -= retlen;
300 buf += retlen;
301 }
302 else {
303 kfree(kbuf);
304 return ret;
305 }
306 }
307
308 kfree(kbuf);
309 return total_retlen;
310} /* mtdchar_write */
311
312/*======================================================================
313
314 IOCTL calls for getting device parameters.
315
316======================================================================*/
317
318static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
319{
320 struct mtd_info *mtd = mfi->mtd;
321 size_t retlen;
322
323 switch (mode) {
324 case MTD_OTP_FACTORY:
325 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
326 -EOPNOTSUPP)
327 return -EOPNOTSUPP;
328
329 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
330 break;
331 case MTD_OTP_USER:
332 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
333 -EOPNOTSUPP)
334 return -EOPNOTSUPP;
335
336 mfi->mode = MTD_FILE_MODE_OTP_USER;
337 break;
338 case MTD_OTP_OFF:
339 mfi->mode = MTD_FILE_MODE_NORMAL;
340 break;
341 default:
342 return -EINVAL;
343 }
344
345 return 0;
346}
347
348static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
349 uint64_t start, uint32_t length, void __user *ptr,
350 uint32_t __user *retp)
351{
352 struct mtd_file_info *mfi = file->private_data;
353 struct mtd_oob_ops ops;
354 uint32_t retlen;
355 int ret = 0;
356
357 if (!(file->f_mode & FMODE_WRITE))
358 return -EPERM;
359
360 if (length > 4096)
361 return -EINVAL;
362
363 if (!mtd->_write_oob)
364 return -EOPNOTSUPP;
365
366 ops.ooblen = length;
367 ops.ooboffs = start & (mtd->writesize - 1);
368 ops.datbuf = NULL;
369 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
370 MTD_OPS_PLACE_OOB;
371
372 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
373 return -EINVAL;
374
375 ops.oobbuf = memdup_user(ptr, length);
376 if (IS_ERR(ops.oobbuf))
377 return PTR_ERR(ops.oobbuf);
378
379 start &= ~((uint64_t)mtd->writesize - 1);
380 ret = mtd_write_oob(mtd, start, &ops);
381
382 if (ops.oobretlen > 0xFFFFFFFFU)
383 ret = -EOVERFLOW;
384 retlen = ops.oobretlen;
385 if (copy_to_user(retp, &retlen, sizeof(length)))
386 ret = -EFAULT;
387
388 kfree(ops.oobbuf);
389 return ret;
390}
391
392static int mtdchar_readoob(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_file_info *mfi = file->private_data;
397 struct mtd_oob_ops ops;
398 int ret = 0;
399
400 if (length > 4096)
401 return -EINVAL;
402
403 ops.ooblen = length;
404 ops.ooboffs = start & (mtd->writesize - 1);
405 ops.datbuf = NULL;
406 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
407 MTD_OPS_PLACE_OOB;
408
409 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
410 return -EINVAL;
411
412 ops.oobbuf = kmalloc(length, GFP_KERNEL);
413 if (!ops.oobbuf)
414 return -ENOMEM;
415
416 start &= ~((uint64_t)mtd->writesize - 1);
417 ret = mtd_read_oob(mtd, start, &ops);
418
419 if (put_user(ops.oobretlen, retp))
420 ret = -EFAULT;
421 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
422 ops.oobretlen))
423 ret = -EFAULT;
424
425 kfree(ops.oobbuf);
426
427 /*
428 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
429 * data. For our userspace tools it is important to dump areas
430 * with ECC errors!
431 * For kernel internal usage it also might return -EUCLEAN
432 * to signal the caller that a bitflip has occurred and has
433 * been corrected by the ECC algorithm.
434 *
435 * Note: currently the standard NAND function, nand_read_oob_std,
436 * does not calculate ECC for the OOB area, so do not rely on
437 * this behavior unless you have replaced it with your own.
438 */
439 if (mtd_is_bitflip_or_eccerr(ret))
440 return 0;
441
442 return ret;
443}
444
445/*
446 * Copies (and truncates, if necessary) OOB layout information to the
447 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
448 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
449 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
450 * can describe any kind of OOB layout with almost zero overhead from a
451 * memory usage point of view).
452 */
453static int shrink_ecclayout(struct mtd_info *mtd,
454 struct nand_ecclayout_user *to)
455{
456 struct mtd_oob_region oobregion;
457 int i, section = 0, ret;
458
459 if (!mtd || !to)
460 return -EINVAL;
461
462 memset(to, 0, sizeof(*to));
463
464 to->eccbytes = 0;
465 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
466 u32 eccpos;
467
468 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
469 if (ret < 0) {
470 if (ret != -ERANGE)
471 return ret;
472
473 break;
474 }
475
476 eccpos = oobregion.offset;
477 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
478 eccpos < oobregion.offset + oobregion.length; i++) {
479 to->eccpos[i] = eccpos++;
480 to->eccbytes++;
481 }
482 }
483
484 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
485 ret = mtd_ooblayout_free(mtd, i, &oobregion);
486 if (ret < 0) {
487 if (ret != -ERANGE)
488 return ret;
489
490 break;
491 }
492
493 to->oobfree[i].offset = oobregion.offset;
494 to->oobfree[i].length = oobregion.length;
495 to->oobavail += to->oobfree[i].length;
496 }
497
498 return 0;
499}
500
501static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
502{
503 struct mtd_oob_region oobregion;
504 int i, section = 0, ret;
505
506 if (!mtd || !to)
507 return -EINVAL;
508
509 memset(to, 0, sizeof(*to));
510
511 to->eccbytes = 0;
512 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
513 u32 eccpos;
514
515 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
516 if (ret < 0) {
517 if (ret != -ERANGE)
518 return ret;
519
520 break;
521 }
522
523 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
524 return -EINVAL;
525
526 eccpos = oobregion.offset;
527 for (; eccpos < oobregion.offset + oobregion.length; i++) {
528 to->eccpos[i] = eccpos++;
529 to->eccbytes++;
530 }
531 }
532
533 for (i = 0; i < 8; i++) {
534 ret = mtd_ooblayout_free(mtd, i, &oobregion);
535 if (ret < 0) {
536 if (ret != -ERANGE)
537 return ret;
538
539 break;
540 }
541
542 to->oobfree[i][0] = oobregion.offset;
543 to->oobfree[i][1] = oobregion.length;
544 }
545
546 to->useecc = MTD_NANDECC_AUTOPLACE;
547
548 return 0;
549}
550
551static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
552 struct blkpg_ioctl_arg *arg)
553{
554 struct blkpg_partition p;
555
556 if (!capable(CAP_SYS_ADMIN))
557 return -EPERM;
558
559 if (copy_from_user(&p, arg->data, sizeof(p)))
560 return -EFAULT;
561
562 switch (arg->op) {
563 case BLKPG_ADD_PARTITION:
564
565 /* Only master mtd device must be used to add partitions */
566 if (mtd_is_partition(mtd))
567 return -EINVAL;
568
569 /* Sanitize user input */
570 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
571
572 return mtd_add_partition(mtd, p.devname, p.start, p.length);
573
574 case BLKPG_DEL_PARTITION:
575
576 if (p.pno < 0)
577 return -EINVAL;
578
579 return mtd_del_partition(mtd, p.pno);
580
581 default:
582 return -EINVAL;
583 }
584}
585
586static int mtdchar_write_ioctl(struct mtd_info *mtd,
587 struct mtd_write_req __user *argp)
588{
589 struct mtd_write_req req;
590 struct mtd_oob_ops ops;
591 const void __user *usr_data, *usr_oob;
592 int ret;
593
594 if (copy_from_user(&req, argp, sizeof(req)))
595 return -EFAULT;
596
597 usr_data = (const void __user *)(uintptr_t)req.usr_data;
598 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
599
600 if (!mtd->_write_oob)
601 return -EOPNOTSUPP;
602
603 ops.mode = req.mode;
604 ops.len = (size_t)req.len;
605 ops.ooblen = (size_t)req.ooblen;
606 ops.ooboffs = 0;
607
608 if (usr_data) {
609 ops.datbuf = memdup_user(usr_data, ops.len);
610 if (IS_ERR(ops.datbuf))
611 return PTR_ERR(ops.datbuf);
612 } else {
613 ops.datbuf = NULL;
614 }
615
616 if (usr_oob) {
617 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
618 if (IS_ERR(ops.oobbuf)) {
619 kfree(ops.datbuf);
620 return PTR_ERR(ops.oobbuf);
621 }
622 } else {
623 ops.oobbuf = NULL;
624 }
625
626 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
627
628 kfree(ops.datbuf);
629 kfree(ops.oobbuf);
630
631 return ret;
632}
633
634static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
635{
636 struct mtd_file_info *mfi = file->private_data;
637 struct mtd_info *mtd = mfi->mtd;
638 void __user *argp = (void __user *)arg;
639 int ret = 0;
640 struct mtd_info_user info;
641
642 pr_debug("MTD_ioctl\n");
643
644 switch (cmd) {
645 case MEMGETREGIONCOUNT:
646 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
647 return -EFAULT;
648 break;
649
650 case MEMGETREGIONINFO:
651 {
652 uint32_t ur_idx;
653 struct mtd_erase_region_info *kr;
654 struct region_info_user __user *ur = argp;
655
656 if (get_user(ur_idx, &(ur->regionindex)))
657 return -EFAULT;
658
659 if (ur_idx >= mtd->numeraseregions)
660 return -EINVAL;
661
662 kr = &(mtd->eraseregions[ur_idx]);
663
664 if (put_user(kr->offset, &(ur->offset))
665 || put_user(kr->erasesize, &(ur->erasesize))
666 || put_user(kr->numblocks, &(ur->numblocks)))
667 return -EFAULT;
668
669 break;
670 }
671
672 case MEMGETINFO:
673 memset(&info, 0, sizeof(info));
674 info.type = mtd->type;
675 info.flags = mtd->flags;
676 info.size = mtd->size;
677 info.erasesize = mtd->erasesize;
678 info.writesize = mtd->writesize;
679 info.oobsize = mtd->oobsize;
680 /* The below field is obsolete */
681 info.padding = 0;
682 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
683 return -EFAULT;
684 break;
685
686 case MEMERASE:
687 case MEMERASE64:
688 {
689 struct erase_info *erase;
690
691 if(!(file->f_mode & FMODE_WRITE))
692 return -EPERM;
693
694 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
695 if (!erase)
696 ret = -ENOMEM;
697 else {
698 if (cmd == MEMERASE64) {
699 struct erase_info_user64 einfo64;
700
701 if (copy_from_user(&einfo64, argp,
702 sizeof(struct erase_info_user64))) {
703 kfree(erase);
704 return -EFAULT;
705 }
706 erase->addr = einfo64.start;
707 erase->len = einfo64.length;
708 } else {
709 struct erase_info_user einfo32;
710
711 if (copy_from_user(&einfo32, argp,
712 sizeof(struct erase_info_user))) {
713 kfree(erase);
714 return -EFAULT;
715 }
716 erase->addr = einfo32.start;
717 erase->len = einfo32.length;
718 }
719
720 ret = mtd_erase(mtd, erase);
721 kfree(erase);
722 }
723 break;
724 }
725
726 case MEMWRITEOOB:
727 {
728 struct mtd_oob_buf buf;
729 struct mtd_oob_buf __user *buf_user = argp;
730
731 /* NOTE: writes return length to buf_user->length */
732 if (copy_from_user(&buf, argp, sizeof(buf)))
733 ret = -EFAULT;
734 else
735 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
736 buf.ptr, &buf_user->length);
737 break;
738 }
739
740 case MEMREADOOB:
741 {
742 struct mtd_oob_buf buf;
743 struct mtd_oob_buf __user *buf_user = argp;
744
745 /* NOTE: writes return length to buf_user->start */
746 if (copy_from_user(&buf, argp, sizeof(buf)))
747 ret = -EFAULT;
748 else
749 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
750 buf.ptr, &buf_user->start);
751 break;
752 }
753
754 case MEMWRITEOOB64:
755 {
756 struct mtd_oob_buf64 buf;
757 struct mtd_oob_buf64 __user *buf_user = argp;
758
759 if (copy_from_user(&buf, argp, sizeof(buf)))
760 ret = -EFAULT;
761 else
762 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
763 (void __user *)(uintptr_t)buf.usr_ptr,
764 &buf_user->length);
765 break;
766 }
767
768 case MEMREADOOB64:
769 {
770 struct mtd_oob_buf64 buf;
771 struct mtd_oob_buf64 __user *buf_user = argp;
772
773 if (copy_from_user(&buf, argp, sizeof(buf)))
774 ret = -EFAULT;
775 else
776 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
777 (void __user *)(uintptr_t)buf.usr_ptr,
778 &buf_user->length);
779 break;
780 }
781
782 case MEMWRITE:
783 {
784 ret = mtdchar_write_ioctl(mtd,
785 (struct mtd_write_req __user *)arg);
786 break;
787 }
788
789 case MEMLOCK:
790 {
791 struct erase_info_user einfo;
792
793 if (copy_from_user(&einfo, argp, sizeof(einfo)))
794 return -EFAULT;
795
796 ret = mtd_lock(mtd, einfo.start, einfo.length);
797 break;
798 }
799
800 case MEMUNLOCK:
801 {
802 struct erase_info_user einfo;
803
804 if (copy_from_user(&einfo, argp, sizeof(einfo)))
805 return -EFAULT;
806
807 ret = mtd_unlock(mtd, einfo.start, einfo.length);
808 break;
809 }
810
811 case MEMISLOCKED:
812 {
813 struct erase_info_user einfo;
814
815 if (copy_from_user(&einfo, argp, sizeof(einfo)))
816 return -EFAULT;
817
818 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
819 break;
820 }
821
822 /* Legacy interface */
823 case MEMGETOOBSEL:
824 {
825 struct nand_oobinfo oi;
826
827 if (!mtd->ooblayout)
828 return -EOPNOTSUPP;
829
830 ret = get_oobinfo(mtd, &oi);
831 if (ret)
832 return ret;
833
834 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
835 return -EFAULT;
836 break;
837 }
838
839 case MEMGETBADBLOCK:
840 {
841 loff_t offs;
842
843 if (copy_from_user(&offs, argp, sizeof(loff_t)))
844 return -EFAULT;
845 return mtd_block_isbad(mtd, offs);
846 break;
847 }
848
849 case MEMSETBADBLOCK:
850 {
851 loff_t offs;
852
853 if (copy_from_user(&offs, argp, sizeof(loff_t)))
854 return -EFAULT;
855 return mtd_block_markbad(mtd, offs);
856 break;
857 }
858
859 case OTPSELECT:
860 {
861 int mode;
862 if (copy_from_user(&mode, argp, sizeof(int)))
863 return -EFAULT;
864
865 mfi->mode = MTD_FILE_MODE_NORMAL;
866
867 ret = otp_select_filemode(mfi, mode);
868
869 file->f_pos = 0;
870 break;
871 }
872
873 case OTPGETREGIONCOUNT:
874 case OTPGETREGIONINFO:
875 {
876 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
877 size_t retlen;
878 if (!buf)
879 return -ENOMEM;
880 switch (mfi->mode) {
881 case MTD_FILE_MODE_OTP_FACTORY:
882 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
883 break;
884 case MTD_FILE_MODE_OTP_USER:
885 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
886 break;
887 default:
888 ret = -EINVAL;
889 break;
890 }
891 if (!ret) {
892 if (cmd == OTPGETREGIONCOUNT) {
893 int nbr = retlen / sizeof(struct otp_info);
894 ret = copy_to_user(argp, &nbr, sizeof(int));
895 } else
896 ret = copy_to_user(argp, buf, retlen);
897 if (ret)
898 ret = -EFAULT;
899 }
900 kfree(buf);
901 break;
902 }
903
904 case OTPLOCK:
905 {
906 struct otp_info oinfo;
907
908 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
909 return -EINVAL;
910 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
911 return -EFAULT;
912 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
913 break;
914 }
915
916 /* This ioctl is being deprecated - it truncates the ECC layout */
917 case ECCGETLAYOUT:
918 {
919 struct nand_ecclayout_user *usrlay;
920
921 if (!mtd->ooblayout)
922 return -EOPNOTSUPP;
923
924 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
925 if (!usrlay)
926 return -ENOMEM;
927
928 shrink_ecclayout(mtd, usrlay);
929
930 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
931 ret = -EFAULT;
932 kfree(usrlay);
933 break;
934 }
935
936 case ECCGETSTATS:
937 {
938 if (copy_to_user(argp, &mtd->ecc_stats,
939 sizeof(struct mtd_ecc_stats)))
940 return -EFAULT;
941 break;
942 }
943
944 case MTDFILEMODE:
945 {
946 mfi->mode = 0;
947
948 switch(arg) {
949 case MTD_FILE_MODE_OTP_FACTORY:
950 case MTD_FILE_MODE_OTP_USER:
951 ret = otp_select_filemode(mfi, arg);
952 break;
953
954 case MTD_FILE_MODE_RAW:
955 if (!mtd_has_oob(mtd))
956 return -EOPNOTSUPP;
957 mfi->mode = arg;
958
959 case MTD_FILE_MODE_NORMAL:
960 break;
961 default:
962 ret = -EINVAL;
963 }
964 file->f_pos = 0;
965 break;
966 }
967
968 case BLKPG:
969 {
970 struct blkpg_ioctl_arg __user *blk_arg = argp;
971 struct blkpg_ioctl_arg a;
972
973 if (copy_from_user(&a, blk_arg, sizeof(a)))
974 ret = -EFAULT;
975 else
976 ret = mtdchar_blkpg_ioctl(mtd, &a);
977 break;
978 }
979
980 case BLKRRPART:
981 {
982 /* No reread partition feature. Just return ok */
983 ret = 0;
984 break;
985 }
986
987 default:
988 ret = -ENOTTY;
989 }
990
991 return ret;
992} /* memory_ioctl */
993
994static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
995{
996 int ret;
997
998 mutex_lock(&mtd_mutex);
999 ret = mtdchar_ioctl(file, cmd, arg);
1000 mutex_unlock(&mtd_mutex);
1001
1002 return ret;
1003}
1004
1005#ifdef CONFIG_COMPAT
1006
1007struct mtd_oob_buf32 {
1008 u_int32_t start;
1009 u_int32_t length;
1010 compat_caddr_t ptr; /* unsigned char* */
1011};
1012
1013#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1014#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1015
1016static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1017 unsigned long arg)
1018{
1019 struct mtd_file_info *mfi = file->private_data;
1020 struct mtd_info *mtd = mfi->mtd;
1021 void __user *argp = compat_ptr(arg);
1022 int ret = 0;
1023
1024 mutex_lock(&mtd_mutex);
1025
1026 switch (cmd) {
1027 case MEMWRITEOOB32:
1028 {
1029 struct mtd_oob_buf32 buf;
1030 struct mtd_oob_buf32 __user *buf_user = argp;
1031
1032 if (copy_from_user(&buf, argp, sizeof(buf)))
1033 ret = -EFAULT;
1034 else
1035 ret = mtdchar_writeoob(file, mtd, buf.start,
1036 buf.length, compat_ptr(buf.ptr),
1037 &buf_user->length);
1038 break;
1039 }
1040
1041 case MEMREADOOB32:
1042 {
1043 struct mtd_oob_buf32 buf;
1044 struct mtd_oob_buf32 __user *buf_user = argp;
1045
1046 /* NOTE: writes return length to buf->start */
1047 if (copy_from_user(&buf, argp, sizeof(buf)))
1048 ret = -EFAULT;
1049 else
1050 ret = mtdchar_readoob(file, mtd, buf.start,
1051 buf.length, compat_ptr(buf.ptr),
1052 &buf_user->start);
1053 break;
1054 }
1055
1056 case BLKPG:
1057 {
1058 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1059 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1060 struct blkpg_compat_ioctl_arg compat_arg;
1061 struct blkpg_ioctl_arg a;
1062
1063 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1064 ret = -EFAULT;
1065 break;
1066 }
1067
1068 memset(&a, 0, sizeof(a));
1069 a.op = compat_arg.op;
1070 a.flags = compat_arg.flags;
1071 a.datalen = compat_arg.datalen;
1072 a.data = compat_ptr(compat_arg.data);
1073
1074 ret = mtdchar_blkpg_ioctl(mtd, &a);
1075 break;
1076 }
1077
1078 default:
1079 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1080 }
1081
1082 mutex_unlock(&mtd_mutex);
1083
1084 return ret;
1085}
1086
1087#endif /* CONFIG_COMPAT */
1088
1089/*
1090 * try to determine where a shared mapping can be made
1091 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1092 * mappings)
1093 */
1094#ifndef CONFIG_MMU
1095static unsigned long mtdchar_get_unmapped_area(struct file *file,
1096 unsigned long addr,
1097 unsigned long len,
1098 unsigned long pgoff,
1099 unsigned long flags)
1100{
1101 struct mtd_file_info *mfi = file->private_data;
1102 struct mtd_info *mtd = mfi->mtd;
1103 unsigned long offset;
1104 int ret;
1105
1106 if (addr != 0)
1107 return (unsigned long) -EINVAL;
1108
1109 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1110 return (unsigned long) -EINVAL;
1111
1112 offset = pgoff << PAGE_SHIFT;
1113 if (offset > mtd->size - len)
1114 return (unsigned long) -EINVAL;
1115
1116 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1117 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1118}
1119
1120static unsigned mtdchar_mmap_capabilities(struct file *file)
1121{
1122 struct mtd_file_info *mfi = file->private_data;
1123
1124 return mtd_mmap_capabilities(mfi->mtd);
1125}
1126#endif
1127
1128/*
1129 * set up a mapping for shared memory segments
1130 */
1131static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1132{
1133#ifdef CONFIG_MMU
1134 struct mtd_file_info *mfi = file->private_data;
1135 struct mtd_info *mtd = mfi->mtd;
1136 struct map_info *map = mtd->priv;
1137
1138 /* This is broken because it assumes the MTD device is map-based
1139 and that mtd->priv is a valid struct map_info. It should be
1140 replaced with something that uses the mtd_get_unmapped_area()
1141 operation properly. */
1142 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1143#ifdef pgprot_noncached
1144 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1145 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1146#endif
1147 return vm_iomap_memory(vma, map->phys, map->size);
1148 }
1149 return -ENODEV;
1150#else
1151 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1152#endif
1153}
1154
1155static const struct file_operations mtd_fops = {
1156 .owner = THIS_MODULE,
1157 .llseek = mtdchar_lseek,
1158 .read = mtdchar_read,
1159 .write = mtdchar_write,
1160 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1161#ifdef CONFIG_COMPAT
1162 .compat_ioctl = mtdchar_compat_ioctl,
1163#endif
1164 .open = mtdchar_open,
1165 .release = mtdchar_close,
1166 .mmap = mtdchar_mmap,
1167#ifndef CONFIG_MMU
1168 .get_unmapped_area = mtdchar_get_unmapped_area,
1169 .mmap_capabilities = mtdchar_mmap_capabilities,
1170#endif
1171};
1172
1173int __init init_mtdchar(void)
1174{
1175 int ret;
1176
1177 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1178 "mtd", &mtd_fops);
1179 if (ret < 0) {
1180 pr_err("Can't allocate major number %d for MTD\n",
1181 MTD_CHAR_MAJOR);
1182 return ret;
1183 }
1184
1185 return ret;
1186}
1187
1188void __exit cleanup_mtdchar(void)
1189{
1190 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1191}
1192
1193MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
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/magic.h>
35#include <linux/major.h>
36#include <linux/mtd/mtd.h>
37#include <linux/mtd/partitions.h>
38#include <linux/mtd/map.h>
39
40#include <asm/uaccess.h>
41
42#include "mtdcore.h"
43
44static DEFINE_MUTEX(mtd_mutex);
45
46/*
47 * Data structure to hold the pointer to the mtd device as well
48 * as mode information of various use cases.
49 */
50struct mtd_file_info {
51 struct mtd_info *mtd;
52 enum mtd_file_modes mode;
53};
54
55static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
56{
57 struct mtd_file_info *mfi = file->private_data;
58 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
59}
60
61static int mtdchar_open(struct inode *inode, struct file *file)
62{
63 int minor = iminor(inode);
64 int devnum = minor >> 1;
65 int ret = 0;
66 struct mtd_info *mtd;
67 struct mtd_file_info *mfi;
68
69 pr_debug("MTD_open\n");
70
71 /* You can't open the RO devices RW */
72 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
73 return -EACCES;
74
75 mutex_lock(&mtd_mutex);
76 mtd = get_mtd_device(NULL, devnum);
77
78 if (IS_ERR(mtd)) {
79 ret = PTR_ERR(mtd);
80 goto out;
81 }
82
83 if (mtd->type == MTD_ABSENT) {
84 ret = -ENODEV;
85 goto out1;
86 }
87
88 /* You can't open it RW if it's not a writeable device */
89 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
90 ret = -EACCES;
91 goto out1;
92 }
93
94 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
95 if (!mfi) {
96 ret = -ENOMEM;
97 goto out1;
98 }
99 mfi->mtd = mtd;
100 file->private_data = mfi;
101 mutex_unlock(&mtd_mutex);
102 return 0;
103
104out1:
105 put_mtd_device(mtd);
106out:
107 mutex_unlock(&mtd_mutex);
108 return ret;
109} /* mtdchar_open */
110
111/*====================================================================*/
112
113static int mtdchar_close(struct inode *inode, struct file *file)
114{
115 struct mtd_file_info *mfi = file->private_data;
116 struct mtd_info *mtd = mfi->mtd;
117
118 pr_debug("MTD_close\n");
119
120 /* Only sync if opened RW */
121 if ((file->f_mode & FMODE_WRITE))
122 mtd_sync(mtd);
123
124 put_mtd_device(mtd);
125 file->private_data = NULL;
126 kfree(mfi);
127
128 return 0;
129} /* mtdchar_close */
130
131/* Back in June 2001, dwmw2 wrote:
132 *
133 * FIXME: This _really_ needs to die. In 2.5, we should lock the
134 * userspace buffer down and use it directly with readv/writev.
135 *
136 * The implementation below, using mtd_kmalloc_up_to, mitigates
137 * allocation failures when the system is under low-memory situations
138 * or if memory is highly fragmented at the cost of reducing the
139 * performance of the requested transfer due to a smaller buffer size.
140 *
141 * A more complex but more memory-efficient implementation based on
142 * get_user_pages and iovecs to cover extents of those pages is a
143 * longer-term goal, as intimated by dwmw2 above. However, for the
144 * write case, this requires yet more complex head and tail transfer
145 * handling when those head and tail offsets and sizes are such that
146 * alignment requirements are not met in the NAND subdriver.
147 */
148
149static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
150 loff_t *ppos)
151{
152 struct mtd_file_info *mfi = file->private_data;
153 struct mtd_info *mtd = mfi->mtd;
154 size_t retlen;
155 size_t total_retlen=0;
156 int ret=0;
157 int len;
158 size_t size = count;
159 char *kbuf;
160
161 pr_debug("MTD_read\n");
162
163 if (*ppos + count > mtd->size)
164 count = mtd->size - *ppos;
165
166 if (!count)
167 return 0;
168
169 kbuf = mtd_kmalloc_up_to(mtd, &size);
170 if (!kbuf)
171 return -ENOMEM;
172
173 while (count) {
174 len = min_t(size_t, count, size);
175
176 switch (mfi->mode) {
177 case MTD_FILE_MODE_OTP_FACTORY:
178 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
179 &retlen, kbuf);
180 break;
181 case MTD_FILE_MODE_OTP_USER:
182 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
183 &retlen, kbuf);
184 break;
185 case MTD_FILE_MODE_RAW:
186 {
187 struct mtd_oob_ops ops;
188
189 ops.mode = MTD_OPS_RAW;
190 ops.datbuf = kbuf;
191 ops.oobbuf = NULL;
192 ops.len = len;
193
194 ret = mtd_read_oob(mtd, *ppos, &ops);
195 retlen = ops.retlen;
196 break;
197 }
198 default:
199 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
200 }
201 /* Nand returns -EBADMSG on ECC errors, but it returns
202 * the data. For our userspace tools it is important
203 * to dump areas with ECC errors!
204 * For kernel internal usage it also might return -EUCLEAN
205 * to signal the caller that a bitflip has occurred and has
206 * been corrected by the ECC algorithm.
207 * Userspace software which accesses NAND this way
208 * must be aware of the fact that it deals with NAND
209 */
210 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
211 *ppos += retlen;
212 if (copy_to_user(buf, kbuf, retlen)) {
213 kfree(kbuf);
214 return -EFAULT;
215 }
216 else
217 total_retlen += retlen;
218
219 count -= retlen;
220 buf += retlen;
221 if (retlen == 0)
222 count = 0;
223 }
224 else {
225 kfree(kbuf);
226 return ret;
227 }
228
229 }
230
231 kfree(kbuf);
232 return total_retlen;
233} /* mtdchar_read */
234
235static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
236 loff_t *ppos)
237{
238 struct mtd_file_info *mfi = file->private_data;
239 struct mtd_info *mtd = mfi->mtd;
240 size_t size = count;
241 char *kbuf;
242 size_t retlen;
243 size_t total_retlen=0;
244 int ret=0;
245 int len;
246
247 pr_debug("MTD_write\n");
248
249 if (*ppos == mtd->size)
250 return -ENOSPC;
251
252 if (*ppos + count > mtd->size)
253 count = mtd->size - *ppos;
254
255 if (!count)
256 return 0;
257
258 kbuf = mtd_kmalloc_up_to(mtd, &size);
259 if (!kbuf)
260 return -ENOMEM;
261
262 while (count) {
263 len = min_t(size_t, count, size);
264
265 if (copy_from_user(kbuf, buf, len)) {
266 kfree(kbuf);
267 return -EFAULT;
268 }
269
270 switch (mfi->mode) {
271 case MTD_FILE_MODE_OTP_FACTORY:
272 ret = -EROFS;
273 break;
274 case MTD_FILE_MODE_OTP_USER:
275 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
276 &retlen, kbuf);
277 break;
278
279 case MTD_FILE_MODE_RAW:
280 {
281 struct mtd_oob_ops ops;
282
283 ops.mode = MTD_OPS_RAW;
284 ops.datbuf = kbuf;
285 ops.oobbuf = NULL;
286 ops.ooboffs = 0;
287 ops.len = len;
288
289 ret = mtd_write_oob(mtd, *ppos, &ops);
290 retlen = ops.retlen;
291 break;
292 }
293
294 default:
295 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
296 }
297
298 /*
299 * Return -ENOSPC only if no data could be written at all.
300 * Otherwise just return the number of bytes that actually
301 * have been written.
302 */
303 if ((ret == -ENOSPC) && (total_retlen))
304 break;
305
306 if (!ret) {
307 *ppos += retlen;
308 total_retlen += retlen;
309 count -= retlen;
310 buf += retlen;
311 }
312 else {
313 kfree(kbuf);
314 return ret;
315 }
316 }
317
318 kfree(kbuf);
319 return total_retlen;
320} /* mtdchar_write */
321
322/*======================================================================
323
324 IOCTL calls for getting device parameters.
325
326======================================================================*/
327static void mtdchar_erase_callback (struct erase_info *instr)
328{
329 wake_up((wait_queue_head_t *)instr->priv);
330}
331
332static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
333{
334 struct mtd_info *mtd = mfi->mtd;
335 size_t retlen;
336
337 switch (mode) {
338 case MTD_OTP_FACTORY:
339 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
340 -EOPNOTSUPP)
341 return -EOPNOTSUPP;
342
343 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
344 break;
345 case MTD_OTP_USER:
346 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
347 -EOPNOTSUPP)
348 return -EOPNOTSUPP;
349
350 mfi->mode = MTD_FILE_MODE_OTP_USER;
351 break;
352 case MTD_OTP_OFF:
353 mfi->mode = MTD_FILE_MODE_NORMAL;
354 break;
355 default:
356 return -EINVAL;
357 }
358
359 return 0;
360}
361
362static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
363 uint64_t start, uint32_t length, void __user *ptr,
364 uint32_t __user *retp)
365{
366 struct mtd_file_info *mfi = file->private_data;
367 struct mtd_oob_ops ops;
368 uint32_t retlen;
369 int ret = 0;
370
371 if (!(file->f_mode & FMODE_WRITE))
372 return -EPERM;
373
374 if (length > 4096)
375 return -EINVAL;
376
377 if (!mtd->_write_oob)
378 ret = -EOPNOTSUPP;
379 else
380 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
381
382 if (ret)
383 return ret;
384
385 ops.ooblen = length;
386 ops.ooboffs = start & (mtd->writesize - 1);
387 ops.datbuf = NULL;
388 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
389 MTD_OPS_PLACE_OOB;
390
391 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
392 return -EINVAL;
393
394 ops.oobbuf = memdup_user(ptr, length);
395 if (IS_ERR(ops.oobbuf))
396 return PTR_ERR(ops.oobbuf);
397
398 start &= ~((uint64_t)mtd->writesize - 1);
399 ret = mtd_write_oob(mtd, start, &ops);
400
401 if (ops.oobretlen > 0xFFFFFFFFU)
402 ret = -EOVERFLOW;
403 retlen = ops.oobretlen;
404 if (copy_to_user(retp, &retlen, sizeof(length)))
405 ret = -EFAULT;
406
407 kfree(ops.oobbuf);
408 return ret;
409}
410
411static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
412 uint64_t start, uint32_t length, void __user *ptr,
413 uint32_t __user *retp)
414{
415 struct mtd_file_info *mfi = file->private_data;
416 struct mtd_oob_ops ops;
417 int ret = 0;
418
419 if (length > 4096)
420 return -EINVAL;
421
422 if (!access_ok(VERIFY_WRITE, ptr, length))
423 return -EFAULT;
424
425 ops.ooblen = length;
426 ops.ooboffs = start & (mtd->writesize - 1);
427 ops.datbuf = NULL;
428 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
429 MTD_OPS_PLACE_OOB;
430
431 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
432 return -EINVAL;
433
434 ops.oobbuf = kmalloc(length, GFP_KERNEL);
435 if (!ops.oobbuf)
436 return -ENOMEM;
437
438 start &= ~((uint64_t)mtd->writesize - 1);
439 ret = mtd_read_oob(mtd, start, &ops);
440
441 if (put_user(ops.oobretlen, retp))
442 ret = -EFAULT;
443 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
444 ops.oobretlen))
445 ret = -EFAULT;
446
447 kfree(ops.oobbuf);
448
449 /*
450 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
451 * data. For our userspace tools it is important to dump areas
452 * with ECC errors!
453 * For kernel internal usage it also might return -EUCLEAN
454 * to signal the caller that a bitflip has occured and has
455 * been corrected by the ECC algorithm.
456 *
457 * Note: currently the standard NAND function, nand_read_oob_std,
458 * does not calculate ECC for the OOB area, so do not rely on
459 * this behavior unless you have replaced it with your own.
460 */
461 if (mtd_is_bitflip_or_eccerr(ret))
462 return 0;
463
464 return ret;
465}
466
467/*
468 * Copies (and truncates, if necessary) data from the larger struct,
469 * nand_ecclayout, to the smaller, deprecated layout struct,
470 * nand_ecclayout_user. This is necessary only to support the deprecated
471 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
472 * nand_ecclayout flexibly (i.e. the struct may change size in new
473 * releases without requiring major rewrites).
474 */
475static int shrink_ecclayout(const struct nand_ecclayout *from,
476 struct nand_ecclayout_user *to)
477{
478 int i;
479
480 if (!from || !to)
481 return -EINVAL;
482
483 memset(to, 0, sizeof(*to));
484
485 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
486 for (i = 0; i < to->eccbytes; i++)
487 to->eccpos[i] = from->eccpos[i];
488
489 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
490 if (from->oobfree[i].length == 0 &&
491 from->oobfree[i].offset == 0)
492 break;
493 to->oobavail += from->oobfree[i].length;
494 to->oobfree[i] = from->oobfree[i];
495 }
496
497 return 0;
498}
499
500static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
501 struct blkpg_ioctl_arg *arg)
502{
503 struct blkpg_partition p;
504
505 if (!capable(CAP_SYS_ADMIN))
506 return -EPERM;
507
508 if (copy_from_user(&p, arg->data, sizeof(p)))
509 return -EFAULT;
510
511 switch (arg->op) {
512 case BLKPG_ADD_PARTITION:
513
514 /* Only master mtd device must be used to add partitions */
515 if (mtd_is_partition(mtd))
516 return -EINVAL;
517
518 /* Sanitize user input */
519 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
520
521 return mtd_add_partition(mtd, p.devname, p.start, p.length);
522
523 case BLKPG_DEL_PARTITION:
524
525 if (p.pno < 0)
526 return -EINVAL;
527
528 return mtd_del_partition(mtd, p.pno);
529
530 default:
531 return -EINVAL;
532 }
533}
534
535static int mtdchar_write_ioctl(struct mtd_info *mtd,
536 struct mtd_write_req __user *argp)
537{
538 struct mtd_write_req req;
539 struct mtd_oob_ops ops;
540 const void __user *usr_data, *usr_oob;
541 int ret;
542
543 if (copy_from_user(&req, argp, sizeof(req)))
544 return -EFAULT;
545
546 usr_data = (const void __user *)(uintptr_t)req.usr_data;
547 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
548 if (!access_ok(VERIFY_READ, usr_data, req.len) ||
549 !access_ok(VERIFY_READ, usr_oob, req.ooblen))
550 return -EFAULT;
551
552 if (!mtd->_write_oob)
553 return -EOPNOTSUPP;
554
555 ops.mode = req.mode;
556 ops.len = (size_t)req.len;
557 ops.ooblen = (size_t)req.ooblen;
558 ops.ooboffs = 0;
559
560 if (usr_data) {
561 ops.datbuf = memdup_user(usr_data, ops.len);
562 if (IS_ERR(ops.datbuf))
563 return PTR_ERR(ops.datbuf);
564 } else {
565 ops.datbuf = NULL;
566 }
567
568 if (usr_oob) {
569 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
570 if (IS_ERR(ops.oobbuf)) {
571 kfree(ops.datbuf);
572 return PTR_ERR(ops.oobbuf);
573 }
574 } else {
575 ops.oobbuf = NULL;
576 }
577
578 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
579
580 kfree(ops.datbuf);
581 kfree(ops.oobbuf);
582
583 return ret;
584}
585
586static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
587{
588 struct mtd_file_info *mfi = file->private_data;
589 struct mtd_info *mtd = mfi->mtd;
590 void __user *argp = (void __user *)arg;
591 int ret = 0;
592 u_long size;
593 struct mtd_info_user info;
594
595 pr_debug("MTD_ioctl\n");
596
597 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
598 if (cmd & IOC_IN) {
599 if (!access_ok(VERIFY_READ, argp, size))
600 return -EFAULT;
601 }
602 if (cmd & IOC_OUT) {
603 if (!access_ok(VERIFY_WRITE, argp, size))
604 return -EFAULT;
605 }
606
607 switch (cmd) {
608 case MEMGETREGIONCOUNT:
609 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
610 return -EFAULT;
611 break;
612
613 case MEMGETREGIONINFO:
614 {
615 uint32_t ur_idx;
616 struct mtd_erase_region_info *kr;
617 struct region_info_user __user *ur = argp;
618
619 if (get_user(ur_idx, &(ur->regionindex)))
620 return -EFAULT;
621
622 if (ur_idx >= mtd->numeraseregions)
623 return -EINVAL;
624
625 kr = &(mtd->eraseregions[ur_idx]);
626
627 if (put_user(kr->offset, &(ur->offset))
628 || put_user(kr->erasesize, &(ur->erasesize))
629 || put_user(kr->numblocks, &(ur->numblocks)))
630 return -EFAULT;
631
632 break;
633 }
634
635 case MEMGETINFO:
636 memset(&info, 0, sizeof(info));
637 info.type = mtd->type;
638 info.flags = mtd->flags;
639 info.size = mtd->size;
640 info.erasesize = mtd->erasesize;
641 info.writesize = mtd->writesize;
642 info.oobsize = mtd->oobsize;
643 /* The below field is obsolete */
644 info.padding = 0;
645 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
646 return -EFAULT;
647 break;
648
649 case MEMERASE:
650 case MEMERASE64:
651 {
652 struct erase_info *erase;
653
654 if(!(file->f_mode & FMODE_WRITE))
655 return -EPERM;
656
657 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
658 if (!erase)
659 ret = -ENOMEM;
660 else {
661 wait_queue_head_t waitq;
662 DECLARE_WAITQUEUE(wait, current);
663
664 init_waitqueue_head(&waitq);
665
666 if (cmd == MEMERASE64) {
667 struct erase_info_user64 einfo64;
668
669 if (copy_from_user(&einfo64, argp,
670 sizeof(struct erase_info_user64))) {
671 kfree(erase);
672 return -EFAULT;
673 }
674 erase->addr = einfo64.start;
675 erase->len = einfo64.length;
676 } else {
677 struct erase_info_user einfo32;
678
679 if (copy_from_user(&einfo32, argp,
680 sizeof(struct erase_info_user))) {
681 kfree(erase);
682 return -EFAULT;
683 }
684 erase->addr = einfo32.start;
685 erase->len = einfo32.length;
686 }
687 erase->mtd = mtd;
688 erase->callback = mtdchar_erase_callback;
689 erase->priv = (unsigned long)&waitq;
690
691 /*
692 FIXME: Allow INTERRUPTIBLE. Which means
693 not having the wait_queue head on the stack.
694
695 If the wq_head is on the stack, and we
696 leave because we got interrupted, then the
697 wq_head is no longer there when the
698 callback routine tries to wake us up.
699 */
700 ret = mtd_erase(mtd, erase);
701 if (!ret) {
702 set_current_state(TASK_UNINTERRUPTIBLE);
703 add_wait_queue(&waitq, &wait);
704 if (erase->state != MTD_ERASE_DONE &&
705 erase->state != MTD_ERASE_FAILED)
706 schedule();
707 remove_wait_queue(&waitq, &wait);
708 set_current_state(TASK_RUNNING);
709
710 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
711 }
712 kfree(erase);
713 }
714 break;
715 }
716
717 case MEMWRITEOOB:
718 {
719 struct mtd_oob_buf buf;
720 struct mtd_oob_buf __user *buf_user = argp;
721
722 /* NOTE: writes return length to buf_user->length */
723 if (copy_from_user(&buf, argp, sizeof(buf)))
724 ret = -EFAULT;
725 else
726 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
727 buf.ptr, &buf_user->length);
728 break;
729 }
730
731 case MEMREADOOB:
732 {
733 struct mtd_oob_buf buf;
734 struct mtd_oob_buf __user *buf_user = argp;
735
736 /* NOTE: writes return length to buf_user->start */
737 if (copy_from_user(&buf, argp, sizeof(buf)))
738 ret = -EFAULT;
739 else
740 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
741 buf.ptr, &buf_user->start);
742 break;
743 }
744
745 case MEMWRITEOOB64:
746 {
747 struct mtd_oob_buf64 buf;
748 struct mtd_oob_buf64 __user *buf_user = argp;
749
750 if (copy_from_user(&buf, argp, sizeof(buf)))
751 ret = -EFAULT;
752 else
753 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
754 (void __user *)(uintptr_t)buf.usr_ptr,
755 &buf_user->length);
756 break;
757 }
758
759 case MEMREADOOB64:
760 {
761 struct mtd_oob_buf64 buf;
762 struct mtd_oob_buf64 __user *buf_user = argp;
763
764 if (copy_from_user(&buf, argp, sizeof(buf)))
765 ret = -EFAULT;
766 else
767 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
768 (void __user *)(uintptr_t)buf.usr_ptr,
769 &buf_user->length);
770 break;
771 }
772
773 case MEMWRITE:
774 {
775 ret = mtdchar_write_ioctl(mtd,
776 (struct mtd_write_req __user *)arg);
777 break;
778 }
779
780 case MEMLOCK:
781 {
782 struct erase_info_user einfo;
783
784 if (copy_from_user(&einfo, argp, sizeof(einfo)))
785 return -EFAULT;
786
787 ret = mtd_lock(mtd, einfo.start, einfo.length);
788 break;
789 }
790
791 case MEMUNLOCK:
792 {
793 struct erase_info_user einfo;
794
795 if (copy_from_user(&einfo, argp, sizeof(einfo)))
796 return -EFAULT;
797
798 ret = mtd_unlock(mtd, einfo.start, einfo.length);
799 break;
800 }
801
802 case MEMISLOCKED:
803 {
804 struct erase_info_user einfo;
805
806 if (copy_from_user(&einfo, argp, sizeof(einfo)))
807 return -EFAULT;
808
809 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
810 break;
811 }
812
813 /* Legacy interface */
814 case MEMGETOOBSEL:
815 {
816 struct nand_oobinfo oi;
817
818 if (!mtd->ecclayout)
819 return -EOPNOTSUPP;
820 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
821 return -EINVAL;
822
823 oi.useecc = MTD_NANDECC_AUTOPLACE;
824 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
825 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
826 sizeof(oi.oobfree));
827 oi.eccbytes = mtd->ecclayout->eccbytes;
828
829 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
830 return -EFAULT;
831 break;
832 }
833
834 case MEMGETBADBLOCK:
835 {
836 loff_t offs;
837
838 if (copy_from_user(&offs, argp, sizeof(loff_t)))
839 return -EFAULT;
840 return mtd_block_isbad(mtd, offs);
841 break;
842 }
843
844 case MEMSETBADBLOCK:
845 {
846 loff_t offs;
847
848 if (copy_from_user(&offs, argp, sizeof(loff_t)))
849 return -EFAULT;
850 return mtd_block_markbad(mtd, offs);
851 break;
852 }
853
854 case OTPSELECT:
855 {
856 int mode;
857 if (copy_from_user(&mode, argp, sizeof(int)))
858 return -EFAULT;
859
860 mfi->mode = MTD_FILE_MODE_NORMAL;
861
862 ret = otp_select_filemode(mfi, mode);
863
864 file->f_pos = 0;
865 break;
866 }
867
868 case OTPGETREGIONCOUNT:
869 case OTPGETREGIONINFO:
870 {
871 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
872 size_t retlen;
873 if (!buf)
874 return -ENOMEM;
875 switch (mfi->mode) {
876 case MTD_FILE_MODE_OTP_FACTORY:
877 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
878 break;
879 case MTD_FILE_MODE_OTP_USER:
880 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
881 break;
882 default:
883 ret = -EINVAL;
884 break;
885 }
886 if (!ret) {
887 if (cmd == OTPGETREGIONCOUNT) {
888 int nbr = retlen / sizeof(struct otp_info);
889 ret = copy_to_user(argp, &nbr, sizeof(int));
890 } else
891 ret = copy_to_user(argp, buf, retlen);
892 if (ret)
893 ret = -EFAULT;
894 }
895 kfree(buf);
896 break;
897 }
898
899 case OTPLOCK:
900 {
901 struct otp_info oinfo;
902
903 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
904 return -EINVAL;
905 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
906 return -EFAULT;
907 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
908 break;
909 }
910
911 /* This ioctl is being deprecated - it truncates the ECC layout */
912 case ECCGETLAYOUT:
913 {
914 struct nand_ecclayout_user *usrlay;
915
916 if (!mtd->ecclayout)
917 return -EOPNOTSUPP;
918
919 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
920 if (!usrlay)
921 return -ENOMEM;
922
923 shrink_ecclayout(mtd->ecclayout, usrlay);
924
925 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
926 ret = -EFAULT;
927 kfree(usrlay);
928 break;
929 }
930
931 case ECCGETSTATS:
932 {
933 if (copy_to_user(argp, &mtd->ecc_stats,
934 sizeof(struct mtd_ecc_stats)))
935 return -EFAULT;
936 break;
937 }
938
939 case MTDFILEMODE:
940 {
941 mfi->mode = 0;
942
943 switch(arg) {
944 case MTD_FILE_MODE_OTP_FACTORY:
945 case MTD_FILE_MODE_OTP_USER:
946 ret = otp_select_filemode(mfi, arg);
947 break;
948
949 case MTD_FILE_MODE_RAW:
950 if (!mtd_has_oob(mtd))
951 return -EOPNOTSUPP;
952 mfi->mode = arg;
953
954 case MTD_FILE_MODE_NORMAL:
955 break;
956 default:
957 ret = -EINVAL;
958 }
959 file->f_pos = 0;
960 break;
961 }
962
963 case BLKPG:
964 {
965 struct blkpg_ioctl_arg __user *blk_arg = argp;
966 struct blkpg_ioctl_arg a;
967
968 if (copy_from_user(&a, blk_arg, sizeof(a)))
969 ret = -EFAULT;
970 else
971 ret = mtdchar_blkpg_ioctl(mtd, &a);
972 break;
973 }
974
975 case BLKRRPART:
976 {
977 /* No reread partition feature. Just return ok */
978 ret = 0;
979 break;
980 }
981
982 default:
983 ret = -ENOTTY;
984 }
985
986 return ret;
987} /* memory_ioctl */
988
989static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
990{
991 int ret;
992
993 mutex_lock(&mtd_mutex);
994 ret = mtdchar_ioctl(file, cmd, arg);
995 mutex_unlock(&mtd_mutex);
996
997 return ret;
998}
999
1000#ifdef CONFIG_COMPAT
1001
1002struct mtd_oob_buf32 {
1003 u_int32_t start;
1004 u_int32_t length;
1005 compat_caddr_t ptr; /* unsigned char* */
1006};
1007
1008#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1009#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1010
1011static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1012 unsigned long arg)
1013{
1014 struct mtd_file_info *mfi = file->private_data;
1015 struct mtd_info *mtd = mfi->mtd;
1016 void __user *argp = compat_ptr(arg);
1017 int ret = 0;
1018
1019 mutex_lock(&mtd_mutex);
1020
1021 switch (cmd) {
1022 case MEMWRITEOOB32:
1023 {
1024 struct mtd_oob_buf32 buf;
1025 struct mtd_oob_buf32 __user *buf_user = argp;
1026
1027 if (copy_from_user(&buf, argp, sizeof(buf)))
1028 ret = -EFAULT;
1029 else
1030 ret = mtdchar_writeoob(file, mtd, buf.start,
1031 buf.length, compat_ptr(buf.ptr),
1032 &buf_user->length);
1033 break;
1034 }
1035
1036 case MEMREADOOB32:
1037 {
1038 struct mtd_oob_buf32 buf;
1039 struct mtd_oob_buf32 __user *buf_user = argp;
1040
1041 /* NOTE: writes return length to buf->start */
1042 if (copy_from_user(&buf, argp, sizeof(buf)))
1043 ret = -EFAULT;
1044 else
1045 ret = mtdchar_readoob(file, mtd, buf.start,
1046 buf.length, compat_ptr(buf.ptr),
1047 &buf_user->start);
1048 break;
1049 }
1050
1051 case BLKPG:
1052 {
1053 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1054 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1055 struct blkpg_compat_ioctl_arg compat_arg;
1056 struct blkpg_ioctl_arg a;
1057
1058 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1059 ret = -EFAULT;
1060 break;
1061 }
1062
1063 memset(&a, 0, sizeof(a));
1064 a.op = compat_arg.op;
1065 a.flags = compat_arg.flags;
1066 a.datalen = compat_arg.datalen;
1067 a.data = compat_ptr(compat_arg.data);
1068
1069 ret = mtdchar_blkpg_ioctl(mtd, &a);
1070 break;
1071 }
1072
1073 default:
1074 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1075 }
1076
1077 mutex_unlock(&mtd_mutex);
1078
1079 return ret;
1080}
1081
1082#endif /* CONFIG_COMPAT */
1083
1084/*
1085 * try to determine where a shared mapping can be made
1086 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1087 * mappings)
1088 */
1089#ifndef CONFIG_MMU
1090static unsigned long mtdchar_get_unmapped_area(struct file *file,
1091 unsigned long addr,
1092 unsigned long len,
1093 unsigned long pgoff,
1094 unsigned long flags)
1095{
1096 struct mtd_file_info *mfi = file->private_data;
1097 struct mtd_info *mtd = mfi->mtd;
1098 unsigned long offset;
1099 int ret;
1100
1101 if (addr != 0)
1102 return (unsigned long) -EINVAL;
1103
1104 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1105 return (unsigned long) -EINVAL;
1106
1107 offset = pgoff << PAGE_SHIFT;
1108 if (offset > mtd->size - len)
1109 return (unsigned long) -EINVAL;
1110
1111 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1112 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1113}
1114
1115static unsigned mtdchar_mmap_capabilities(struct file *file)
1116{
1117 struct mtd_file_info *mfi = file->private_data;
1118
1119 return mtd_mmap_capabilities(mfi->mtd);
1120}
1121#endif
1122
1123/*
1124 * set up a mapping for shared memory segments
1125 */
1126static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1127{
1128#ifdef CONFIG_MMU
1129 struct mtd_file_info *mfi = file->private_data;
1130 struct mtd_info *mtd = mfi->mtd;
1131 struct map_info *map = mtd->priv;
1132
1133 /* This is broken because it assumes the MTD device is map-based
1134 and that mtd->priv is a valid struct map_info. It should be
1135 replaced with something that uses the mtd_get_unmapped_area()
1136 operation properly. */
1137 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1138#ifdef pgprot_noncached
1139 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1140 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1141#endif
1142 return vm_iomap_memory(vma, map->phys, map->size);
1143 }
1144 return -ENODEV;
1145#else
1146 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1147#endif
1148}
1149
1150static const struct file_operations mtd_fops = {
1151 .owner = THIS_MODULE,
1152 .llseek = mtdchar_lseek,
1153 .read = mtdchar_read,
1154 .write = mtdchar_write,
1155 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1156#ifdef CONFIG_COMPAT
1157 .compat_ioctl = mtdchar_compat_ioctl,
1158#endif
1159 .open = mtdchar_open,
1160 .release = mtdchar_close,
1161 .mmap = mtdchar_mmap,
1162#ifndef CONFIG_MMU
1163 .get_unmapped_area = mtdchar_get_unmapped_area,
1164 .mmap_capabilities = mtdchar_mmap_capabilities,
1165#endif
1166};
1167
1168int __init init_mtdchar(void)
1169{
1170 int ret;
1171
1172 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1173 "mtd", &mtd_fops);
1174 if (ret < 0) {
1175 pr_err("Can't allocate major number %d for MTD\n",
1176 MTD_CHAR_MAJOR);
1177 return ret;
1178 }
1179
1180 return ret;
1181}
1182
1183void __exit cleanup_mtdchar(void)
1184{
1185 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1186}
1187
1188MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);