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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_info *master = mtd_get_master(mtd);
353 struct mtd_file_info *mfi = file->private_data;
354 struct mtd_oob_ops ops = {};
355 uint32_t retlen;
356 int ret = 0;
357
358 if (length > 4096)
359 return -EINVAL;
360
361 if (!master->_write_oob)
362 return -EOPNOTSUPP;
363
364 ops.ooblen = length;
365 ops.ooboffs = start & (mtd->writesize - 1);
366 ops.datbuf = NULL;
367 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
368 MTD_OPS_PLACE_OOB;
369
370 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
371 return -EINVAL;
372
373 ops.oobbuf = memdup_user(ptr, length);
374 if (IS_ERR(ops.oobbuf))
375 return PTR_ERR(ops.oobbuf);
376
377 start &= ~((uint64_t)mtd->writesize - 1);
378 ret = mtd_write_oob(mtd, start, &ops);
379
380 if (ops.oobretlen > 0xFFFFFFFFU)
381 ret = -EOVERFLOW;
382 retlen = ops.oobretlen;
383 if (copy_to_user(retp, &retlen, sizeof(length)))
384 ret = -EFAULT;
385
386 kfree(ops.oobbuf);
387 return ret;
388}
389
390static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
391 uint64_t start, uint32_t length, void __user *ptr,
392 uint32_t __user *retp)
393{
394 struct mtd_file_info *mfi = file->private_data;
395 struct mtd_oob_ops ops = {};
396 int ret = 0;
397
398 if (length > 4096)
399 return -EINVAL;
400
401 ops.ooblen = length;
402 ops.ooboffs = start & (mtd->writesize - 1);
403 ops.datbuf = NULL;
404 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
405 MTD_OPS_PLACE_OOB;
406
407 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
408 return -EINVAL;
409
410 ops.oobbuf = kmalloc(length, GFP_KERNEL);
411 if (!ops.oobbuf)
412 return -ENOMEM;
413
414 start &= ~((uint64_t)mtd->writesize - 1);
415 ret = mtd_read_oob(mtd, start, &ops);
416
417 if (put_user(ops.oobretlen, retp))
418 ret = -EFAULT;
419 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
420 ops.oobretlen))
421 ret = -EFAULT;
422
423 kfree(ops.oobbuf);
424
425 /*
426 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
427 * data. For our userspace tools it is important to dump areas
428 * with ECC errors!
429 * For kernel internal usage it also might return -EUCLEAN
430 * to signal the caller that a bitflip has occurred and has
431 * been corrected by the ECC algorithm.
432 *
433 * Note: currently the standard NAND function, nand_read_oob_std,
434 * does not calculate ECC for the OOB area, so do not rely on
435 * this behavior unless you have replaced it with your own.
436 */
437 if (mtd_is_bitflip_or_eccerr(ret))
438 return 0;
439
440 return ret;
441}
442
443/*
444 * Copies (and truncates, if necessary) OOB layout information to the
445 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
446 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
447 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
448 * can describe any kind of OOB layout with almost zero overhead from a
449 * memory usage point of view).
450 */
451static int shrink_ecclayout(struct mtd_info *mtd,
452 struct nand_ecclayout_user *to)
453{
454 struct mtd_oob_region oobregion;
455 int i, section = 0, ret;
456
457 if (!mtd || !to)
458 return -EINVAL;
459
460 memset(to, 0, sizeof(*to));
461
462 to->eccbytes = 0;
463 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
464 u32 eccpos;
465
466 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
467 if (ret < 0) {
468 if (ret != -ERANGE)
469 return ret;
470
471 break;
472 }
473
474 eccpos = oobregion.offset;
475 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
476 eccpos < oobregion.offset + oobregion.length; i++) {
477 to->eccpos[i] = eccpos++;
478 to->eccbytes++;
479 }
480 }
481
482 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
483 ret = mtd_ooblayout_free(mtd, i, &oobregion);
484 if (ret < 0) {
485 if (ret != -ERANGE)
486 return ret;
487
488 break;
489 }
490
491 to->oobfree[i].offset = oobregion.offset;
492 to->oobfree[i].length = oobregion.length;
493 to->oobavail += to->oobfree[i].length;
494 }
495
496 return 0;
497}
498
499static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
500{
501 struct mtd_oob_region oobregion;
502 int i, section = 0, ret;
503
504 if (!mtd || !to)
505 return -EINVAL;
506
507 memset(to, 0, sizeof(*to));
508
509 to->eccbytes = 0;
510 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
511 u32 eccpos;
512
513 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
514 if (ret < 0) {
515 if (ret != -ERANGE)
516 return ret;
517
518 break;
519 }
520
521 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
522 return -EINVAL;
523
524 eccpos = oobregion.offset;
525 for (; eccpos < oobregion.offset + oobregion.length; i++) {
526 to->eccpos[i] = eccpos++;
527 to->eccbytes++;
528 }
529 }
530
531 for (i = 0; i < 8; i++) {
532 ret = mtd_ooblayout_free(mtd, i, &oobregion);
533 if (ret < 0) {
534 if (ret != -ERANGE)
535 return ret;
536
537 break;
538 }
539
540 to->oobfree[i][0] = oobregion.offset;
541 to->oobfree[i][1] = oobregion.length;
542 }
543
544 to->useecc = MTD_NANDECC_AUTOPLACE;
545
546 return 0;
547}
548
549static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
550 struct blkpg_ioctl_arg *arg)
551{
552 struct blkpg_partition p;
553
554 if (!capable(CAP_SYS_ADMIN))
555 return -EPERM;
556
557 if (copy_from_user(&p, arg->data, sizeof(p)))
558 return -EFAULT;
559
560 switch (arg->op) {
561 case BLKPG_ADD_PARTITION:
562
563 /* Only master mtd device must be used to add partitions */
564 if (mtd_is_partition(mtd))
565 return -EINVAL;
566
567 /* Sanitize user input */
568 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
569
570 return mtd_add_partition(mtd, p.devname, p.start, p.length);
571
572 case BLKPG_DEL_PARTITION:
573
574 if (p.pno < 0)
575 return -EINVAL;
576
577 return mtd_del_partition(mtd, p.pno);
578
579 default:
580 return -EINVAL;
581 }
582}
583
584static int mtdchar_write_ioctl(struct mtd_info *mtd,
585 struct mtd_write_req __user *argp)
586{
587 struct mtd_info *master = mtd_get_master(mtd);
588 struct mtd_write_req req;
589 struct mtd_oob_ops ops = {};
590 const void __user *usr_data, *usr_oob;
591 int ret;
592
593 if (copy_from_user(&req, argp, sizeof(req)))
594 return -EFAULT;
595
596 usr_data = (const void __user *)(uintptr_t)req.usr_data;
597 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
598
599 if (!master->_write_oob)
600 return -EOPNOTSUPP;
601 ops.mode = req.mode;
602 ops.len = (size_t)req.len;
603 ops.ooblen = (size_t)req.ooblen;
604 ops.ooboffs = 0;
605
606 if (usr_data) {
607 ops.datbuf = memdup_user(usr_data, ops.len);
608 if (IS_ERR(ops.datbuf))
609 return PTR_ERR(ops.datbuf);
610 } else {
611 ops.datbuf = NULL;
612 }
613
614 if (usr_oob) {
615 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
616 if (IS_ERR(ops.oobbuf)) {
617 kfree(ops.datbuf);
618 return PTR_ERR(ops.oobbuf);
619 }
620 } else {
621 ops.oobbuf = NULL;
622 }
623
624 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
625
626 kfree(ops.datbuf);
627 kfree(ops.oobbuf);
628
629 return ret;
630}
631
632static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
633{
634 struct mtd_file_info *mfi = file->private_data;
635 struct mtd_info *mtd = mfi->mtd;
636 struct mtd_info *master = mtd_get_master(mtd);
637 void __user *argp = (void __user *)arg;
638 int ret = 0;
639 struct mtd_info_user info;
640
641 pr_debug("MTD_ioctl\n");
642
643 /*
644 * Check the file mode to require "dangerous" commands to have write
645 * permissions.
646 */
647 switch (cmd) {
648 /* "safe" commands */
649 case MEMGETREGIONCOUNT:
650 case MEMGETREGIONINFO:
651 case MEMGETINFO:
652 case MEMREADOOB:
653 case MEMREADOOB64:
654 case MEMLOCK:
655 case MEMUNLOCK:
656 case MEMISLOCKED:
657 case MEMGETOOBSEL:
658 case MEMGETBADBLOCK:
659 case MEMSETBADBLOCK:
660 case OTPSELECT:
661 case OTPGETREGIONCOUNT:
662 case OTPGETREGIONINFO:
663 case OTPLOCK:
664 case ECCGETLAYOUT:
665 case ECCGETSTATS:
666 case MTDFILEMODE:
667 case BLKPG:
668 case BLKRRPART:
669 break;
670
671 /* "dangerous" commands */
672 case MEMERASE:
673 case MEMERASE64:
674 case MEMWRITEOOB:
675 case MEMWRITEOOB64:
676 case MEMWRITE:
677 if (!(file->f_mode & FMODE_WRITE))
678 return -EPERM;
679 break;
680
681 default:
682 return -ENOTTY;
683 }
684
685 switch (cmd) {
686 case MEMGETREGIONCOUNT:
687 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
688 return -EFAULT;
689 break;
690
691 case MEMGETREGIONINFO:
692 {
693 uint32_t ur_idx;
694 struct mtd_erase_region_info *kr;
695 struct region_info_user __user *ur = argp;
696
697 if (get_user(ur_idx, &(ur->regionindex)))
698 return -EFAULT;
699
700 if (ur_idx >= mtd->numeraseregions)
701 return -EINVAL;
702
703 kr = &(mtd->eraseregions[ur_idx]);
704
705 if (put_user(kr->offset, &(ur->offset))
706 || put_user(kr->erasesize, &(ur->erasesize))
707 || put_user(kr->numblocks, &(ur->numblocks)))
708 return -EFAULT;
709
710 break;
711 }
712
713 case MEMGETINFO:
714 memset(&info, 0, sizeof(info));
715 info.type = mtd->type;
716 info.flags = mtd->flags;
717 info.size = mtd->size;
718 info.erasesize = mtd->erasesize;
719 info.writesize = mtd->writesize;
720 info.oobsize = mtd->oobsize;
721 /* The below field is obsolete */
722 info.padding = 0;
723 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
724 return -EFAULT;
725 break;
726
727 case MEMERASE:
728 case MEMERASE64:
729 {
730 struct erase_info *erase;
731
732 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
733 if (!erase)
734 ret = -ENOMEM;
735 else {
736 if (cmd == MEMERASE64) {
737 struct erase_info_user64 einfo64;
738
739 if (copy_from_user(&einfo64, argp,
740 sizeof(struct erase_info_user64))) {
741 kfree(erase);
742 return -EFAULT;
743 }
744 erase->addr = einfo64.start;
745 erase->len = einfo64.length;
746 } else {
747 struct erase_info_user einfo32;
748
749 if (copy_from_user(&einfo32, argp,
750 sizeof(struct erase_info_user))) {
751 kfree(erase);
752 return -EFAULT;
753 }
754 erase->addr = einfo32.start;
755 erase->len = einfo32.length;
756 }
757
758 ret = mtd_erase(mtd, erase);
759 kfree(erase);
760 }
761 break;
762 }
763
764 case MEMWRITEOOB:
765 {
766 struct mtd_oob_buf buf;
767 struct mtd_oob_buf __user *buf_user = argp;
768
769 /* NOTE: writes return length to buf_user->length */
770 if (copy_from_user(&buf, argp, sizeof(buf)))
771 ret = -EFAULT;
772 else
773 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
774 buf.ptr, &buf_user->length);
775 break;
776 }
777
778 case MEMREADOOB:
779 {
780 struct mtd_oob_buf buf;
781 struct mtd_oob_buf __user *buf_user = argp;
782
783 /* NOTE: writes return length to buf_user->start */
784 if (copy_from_user(&buf, argp, sizeof(buf)))
785 ret = -EFAULT;
786 else
787 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
788 buf.ptr, &buf_user->start);
789 break;
790 }
791
792 case MEMWRITEOOB64:
793 {
794 struct mtd_oob_buf64 buf;
795 struct mtd_oob_buf64 __user *buf_user = argp;
796
797 if (copy_from_user(&buf, argp, sizeof(buf)))
798 ret = -EFAULT;
799 else
800 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
801 (void __user *)(uintptr_t)buf.usr_ptr,
802 &buf_user->length);
803 break;
804 }
805
806 case MEMREADOOB64:
807 {
808 struct mtd_oob_buf64 buf;
809 struct mtd_oob_buf64 __user *buf_user = argp;
810
811 if (copy_from_user(&buf, argp, sizeof(buf)))
812 ret = -EFAULT;
813 else
814 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
815 (void __user *)(uintptr_t)buf.usr_ptr,
816 &buf_user->length);
817 break;
818 }
819
820 case MEMWRITE:
821 {
822 ret = mtdchar_write_ioctl(mtd,
823 (struct mtd_write_req __user *)arg);
824 break;
825 }
826
827 case MEMLOCK:
828 {
829 struct erase_info_user einfo;
830
831 if (copy_from_user(&einfo, argp, sizeof(einfo)))
832 return -EFAULT;
833
834 ret = mtd_lock(mtd, einfo.start, einfo.length);
835 break;
836 }
837
838 case MEMUNLOCK:
839 {
840 struct erase_info_user einfo;
841
842 if (copy_from_user(&einfo, argp, sizeof(einfo)))
843 return -EFAULT;
844
845 ret = mtd_unlock(mtd, einfo.start, einfo.length);
846 break;
847 }
848
849 case MEMISLOCKED:
850 {
851 struct erase_info_user einfo;
852
853 if (copy_from_user(&einfo, argp, sizeof(einfo)))
854 return -EFAULT;
855
856 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
857 break;
858 }
859
860 /* Legacy interface */
861 case MEMGETOOBSEL:
862 {
863 struct nand_oobinfo oi;
864
865 if (!master->ooblayout)
866 return -EOPNOTSUPP;
867
868 ret = get_oobinfo(mtd, &oi);
869 if (ret)
870 return ret;
871
872 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
873 return -EFAULT;
874 break;
875 }
876
877 case MEMGETBADBLOCK:
878 {
879 loff_t offs;
880
881 if (copy_from_user(&offs, argp, sizeof(loff_t)))
882 return -EFAULT;
883 return mtd_block_isbad(mtd, offs);
884 break;
885 }
886
887 case MEMSETBADBLOCK:
888 {
889 loff_t offs;
890
891 if (copy_from_user(&offs, argp, sizeof(loff_t)))
892 return -EFAULT;
893 return mtd_block_markbad(mtd, offs);
894 break;
895 }
896
897 case OTPSELECT:
898 {
899 int mode;
900 if (copy_from_user(&mode, argp, sizeof(int)))
901 return -EFAULT;
902
903 mfi->mode = MTD_FILE_MODE_NORMAL;
904
905 ret = otp_select_filemode(mfi, mode);
906
907 file->f_pos = 0;
908 break;
909 }
910
911 case OTPGETREGIONCOUNT:
912 case OTPGETREGIONINFO:
913 {
914 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
915 size_t retlen;
916 if (!buf)
917 return -ENOMEM;
918 switch (mfi->mode) {
919 case MTD_FILE_MODE_OTP_FACTORY:
920 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
921 break;
922 case MTD_FILE_MODE_OTP_USER:
923 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
924 break;
925 default:
926 ret = -EINVAL;
927 break;
928 }
929 if (!ret) {
930 if (cmd == OTPGETREGIONCOUNT) {
931 int nbr = retlen / sizeof(struct otp_info);
932 ret = copy_to_user(argp, &nbr, sizeof(int));
933 } else
934 ret = copy_to_user(argp, buf, retlen);
935 if (ret)
936 ret = -EFAULT;
937 }
938 kfree(buf);
939 break;
940 }
941
942 case OTPLOCK:
943 {
944 struct otp_info oinfo;
945
946 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
947 return -EINVAL;
948 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
949 return -EFAULT;
950 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
951 break;
952 }
953
954 /* This ioctl is being deprecated - it truncates the ECC layout */
955 case ECCGETLAYOUT:
956 {
957 struct nand_ecclayout_user *usrlay;
958
959 if (!master->ooblayout)
960 return -EOPNOTSUPP;
961
962 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
963 if (!usrlay)
964 return -ENOMEM;
965
966 shrink_ecclayout(mtd, usrlay);
967
968 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
969 ret = -EFAULT;
970 kfree(usrlay);
971 break;
972 }
973
974 case ECCGETSTATS:
975 {
976 if (copy_to_user(argp, &mtd->ecc_stats,
977 sizeof(struct mtd_ecc_stats)))
978 return -EFAULT;
979 break;
980 }
981
982 case MTDFILEMODE:
983 {
984 mfi->mode = 0;
985
986 switch(arg) {
987 case MTD_FILE_MODE_OTP_FACTORY:
988 case MTD_FILE_MODE_OTP_USER:
989 ret = otp_select_filemode(mfi, arg);
990 break;
991
992 case MTD_FILE_MODE_RAW:
993 if (!mtd_has_oob(mtd))
994 return -EOPNOTSUPP;
995 mfi->mode = arg;
996
997 case MTD_FILE_MODE_NORMAL:
998 break;
999 default:
1000 ret = -EINVAL;
1001 }
1002 file->f_pos = 0;
1003 break;
1004 }
1005
1006 case BLKPG:
1007 {
1008 struct blkpg_ioctl_arg __user *blk_arg = argp;
1009 struct blkpg_ioctl_arg a;
1010
1011 if (copy_from_user(&a, blk_arg, sizeof(a)))
1012 ret = -EFAULT;
1013 else
1014 ret = mtdchar_blkpg_ioctl(mtd, &a);
1015 break;
1016 }
1017
1018 case BLKRRPART:
1019 {
1020 /* No reread partition feature. Just return ok */
1021 ret = 0;
1022 break;
1023 }
1024 }
1025
1026 return ret;
1027} /* memory_ioctl */
1028
1029static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1030{
1031 int ret;
1032
1033 mutex_lock(&mtd_mutex);
1034 ret = mtdchar_ioctl(file, cmd, arg);
1035 mutex_unlock(&mtd_mutex);
1036
1037 return ret;
1038}
1039
1040#ifdef CONFIG_COMPAT
1041
1042struct mtd_oob_buf32 {
1043 u_int32_t start;
1044 u_int32_t length;
1045 compat_caddr_t ptr; /* unsigned char* */
1046};
1047
1048#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1049#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1050
1051static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1052 unsigned long arg)
1053{
1054 struct mtd_file_info *mfi = file->private_data;
1055 struct mtd_info *mtd = mfi->mtd;
1056 void __user *argp = compat_ptr(arg);
1057 int ret = 0;
1058
1059 mutex_lock(&mtd_mutex);
1060
1061 switch (cmd) {
1062 case MEMWRITEOOB32:
1063 {
1064 struct mtd_oob_buf32 buf;
1065 struct mtd_oob_buf32 __user *buf_user = argp;
1066
1067 if (!(file->f_mode & FMODE_WRITE)) {
1068 ret = -EPERM;
1069 break;
1070 }
1071
1072 if (copy_from_user(&buf, argp, sizeof(buf)))
1073 ret = -EFAULT;
1074 else
1075 ret = mtdchar_writeoob(file, mtd, buf.start,
1076 buf.length, compat_ptr(buf.ptr),
1077 &buf_user->length);
1078 break;
1079 }
1080
1081 case MEMREADOOB32:
1082 {
1083 struct mtd_oob_buf32 buf;
1084 struct mtd_oob_buf32 __user *buf_user = argp;
1085
1086 /* NOTE: writes return length to buf->start */
1087 if (copy_from_user(&buf, argp, sizeof(buf)))
1088 ret = -EFAULT;
1089 else
1090 ret = mtdchar_readoob(file, mtd, buf.start,
1091 buf.length, compat_ptr(buf.ptr),
1092 &buf_user->start);
1093 break;
1094 }
1095
1096 case BLKPG:
1097 {
1098 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1099 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1100 struct blkpg_compat_ioctl_arg compat_arg;
1101 struct blkpg_ioctl_arg a;
1102
1103 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1104 ret = -EFAULT;
1105 break;
1106 }
1107
1108 memset(&a, 0, sizeof(a));
1109 a.op = compat_arg.op;
1110 a.flags = compat_arg.flags;
1111 a.datalen = compat_arg.datalen;
1112 a.data = compat_ptr(compat_arg.data);
1113
1114 ret = mtdchar_blkpg_ioctl(mtd, &a);
1115 break;
1116 }
1117
1118 default:
1119 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1120 }
1121
1122 mutex_unlock(&mtd_mutex);
1123
1124 return ret;
1125}
1126
1127#endif /* CONFIG_COMPAT */
1128
1129/*
1130 * try to determine where a shared mapping can be made
1131 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1132 * mappings)
1133 */
1134#ifndef CONFIG_MMU
1135static unsigned long mtdchar_get_unmapped_area(struct file *file,
1136 unsigned long addr,
1137 unsigned long len,
1138 unsigned long pgoff,
1139 unsigned long flags)
1140{
1141 struct mtd_file_info *mfi = file->private_data;
1142 struct mtd_info *mtd = mfi->mtd;
1143 unsigned long offset;
1144 int ret;
1145
1146 if (addr != 0)
1147 return (unsigned long) -EINVAL;
1148
1149 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1150 return (unsigned long) -EINVAL;
1151
1152 offset = pgoff << PAGE_SHIFT;
1153 if (offset > mtd->size - len)
1154 return (unsigned long) -EINVAL;
1155
1156 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1157 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1158}
1159
1160static unsigned mtdchar_mmap_capabilities(struct file *file)
1161{
1162 struct mtd_file_info *mfi = file->private_data;
1163
1164 return mtd_mmap_capabilities(mfi->mtd);
1165}
1166#endif
1167
1168/*
1169 * set up a mapping for shared memory segments
1170 */
1171static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1172{
1173#ifdef CONFIG_MMU
1174 struct mtd_file_info *mfi = file->private_data;
1175 struct mtd_info *mtd = mfi->mtd;
1176 struct map_info *map = mtd->priv;
1177
1178 /* This is broken because it assumes the MTD device is map-based
1179 and that mtd->priv is a valid struct map_info. It should be
1180 replaced with something that uses the mtd_get_unmapped_area()
1181 operation properly. */
1182 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1183#ifdef pgprot_noncached
1184 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1185 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1186#endif
1187 return vm_iomap_memory(vma, map->phys, map->size);
1188 }
1189 return -ENODEV;
1190#else
1191 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1192#endif
1193}
1194
1195static const struct file_operations mtd_fops = {
1196 .owner = THIS_MODULE,
1197 .llseek = mtdchar_lseek,
1198 .read = mtdchar_read,
1199 .write = mtdchar_write,
1200 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1201#ifdef CONFIG_COMPAT
1202 .compat_ioctl = mtdchar_compat_ioctl,
1203#endif
1204 .open = mtdchar_open,
1205 .release = mtdchar_close,
1206 .mmap = mtdchar_mmap,
1207#ifndef CONFIG_MMU
1208 .get_unmapped_area = mtdchar_get_unmapped_area,
1209 .mmap_capabilities = mtdchar_mmap_capabilities,
1210#endif
1211};
1212
1213int __init init_mtdchar(void)
1214{
1215 int ret;
1216
1217 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1218 "mtd", &mtd_fops);
1219 if (ret < 0) {
1220 pr_err("Can't allocate major number %d for MTD\n",
1221 MTD_CHAR_MAJOR);
1222 return ret;
1223 }
1224
1225 return ret;
1226}
1227
1228void __exit cleanup_mtdchar(void)
1229{
1230 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1231}
1232
1233MODULE_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/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
41static DEFINE_MUTEX(mtd_mutex);
42static 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 */
48struct mtd_file_info {
49 struct mtd_info *mtd;
50 struct inode *ino;
51 enum mtd_file_modes mode;
52};
53
54static 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
80static 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
142out:
143 mutex_unlock(&mtd_mutex);
144 return ret;
145} /* mtd_open */
146
147/*====================================================================*/
148
149static 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
187static 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
270static 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======================================================================*/
354static 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
360static 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
389static 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
436static 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 */
486static 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
511static 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
547static 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
958static 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
971struct 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
980static 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
1036static 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 */
1069static 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
1108static 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
1125static 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
1131static struct file_system_type mtd_inodefs_type = {
1132 .name = "mtd_inodefs",
1133 .mount = mtd_inodefs_mount,
1134 .kill_sb = kill_anon_super,
1135};
1136
1137static void mtdchar_notify_add(struct mtd_info *mtd)
1138{
1139}
1140
1141static 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
1152static struct mtd_notifier mtdchar_notifier = {
1153 .add = mtdchar_notify_add,
1154 .remove = mtdchar_notify_remove,
1155};
1156
1157static 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
1185err_unregister_filesystem:
1186 unregister_filesystem(&mtd_inodefs_type);
1187err_unregister_chdev:
1188 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1189 return ret;
1190}
1191
1192static 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
1200module_init(init_mtdchar);
1201module_exit(cleanup_mtdchar);
1202
1203MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1204
1205MODULE_LICENSE("GPL");
1206MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1207MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1208MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);