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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// 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
30/*
31 * Data structure to hold the pointer to the mtd device as well
32 * as mode information of various use cases.
33 */
34struct mtd_file_info {
35 struct mtd_info *mtd;
36 enum mtd_file_modes mode;
37};
38
39static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
40{
41 struct mtd_file_info *mfi = file->private_data;
42 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
43}
44
45static int mtdchar_open(struct inode *inode, struct file *file)
46{
47 int minor = iminor(inode);
48 int devnum = minor >> 1;
49 int ret = 0;
50 struct mtd_info *mtd;
51 struct mtd_file_info *mfi;
52
53 pr_debug("MTD_open\n");
54
55 /* You can't open the RO devices RW */
56 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
57 return -EACCES;
58
59 mtd = get_mtd_device(NULL, devnum);
60
61 if (IS_ERR(mtd))
62 return PTR_ERR(mtd);
63
64 if (mtd->type == MTD_ABSENT) {
65 ret = -ENODEV;
66 goto out1;
67 }
68
69 /* You can't open it RW if it's not a writeable device */
70 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
71 ret = -EACCES;
72 goto out1;
73 }
74
75 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
76 if (!mfi) {
77 ret = -ENOMEM;
78 goto out1;
79 }
80 mfi->mtd = mtd;
81 file->private_data = mfi;
82 return 0;
83
84out1:
85 put_mtd_device(mtd);
86 return ret;
87} /* mtdchar_open */
88
89/*====================================================================*/
90
91static int mtdchar_close(struct inode *inode, struct file *file)
92{
93 struct mtd_file_info *mfi = file->private_data;
94 struct mtd_info *mtd = mfi->mtd;
95
96 pr_debug("MTD_close\n");
97
98 /* Only sync if opened RW */
99 if ((file->f_mode & FMODE_WRITE))
100 mtd_sync(mtd);
101
102 put_mtd_device(mtd);
103 file->private_data = NULL;
104 kfree(mfi);
105
106 return 0;
107} /* mtdchar_close */
108
109/* Back in June 2001, dwmw2 wrote:
110 *
111 * FIXME: This _really_ needs to die. In 2.5, we should lock the
112 * userspace buffer down and use it directly with readv/writev.
113 *
114 * The implementation below, using mtd_kmalloc_up_to, mitigates
115 * allocation failures when the system is under low-memory situations
116 * or if memory is highly fragmented at the cost of reducing the
117 * performance of the requested transfer due to a smaller buffer size.
118 *
119 * A more complex but more memory-efficient implementation based on
120 * get_user_pages and iovecs to cover extents of those pages is a
121 * longer-term goal, as intimated by dwmw2 above. However, for the
122 * write case, this requires yet more complex head and tail transfer
123 * handling when those head and tail offsets and sizes are such that
124 * alignment requirements are not met in the NAND subdriver.
125 */
126
127static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
128 loff_t *ppos)
129{
130 struct mtd_file_info *mfi = file->private_data;
131 struct mtd_info *mtd = mfi->mtd;
132 size_t retlen;
133 size_t total_retlen=0;
134 int ret=0;
135 int len;
136 size_t size = count;
137 char *kbuf;
138
139 pr_debug("MTD_read\n");
140
141 if (*ppos + count > mtd->size) {
142 if (*ppos < mtd->size)
143 count = mtd->size - *ppos;
144 else
145 count = 0;
146 }
147
148 if (!count)
149 return 0;
150
151 kbuf = mtd_kmalloc_up_to(mtd, &size);
152 if (!kbuf)
153 return -ENOMEM;
154
155 while (count) {
156 len = min_t(size_t, count, size);
157
158 switch (mfi->mode) {
159 case MTD_FILE_MODE_OTP_FACTORY:
160 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
161 &retlen, kbuf);
162 break;
163 case MTD_FILE_MODE_OTP_USER:
164 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
165 &retlen, kbuf);
166 break;
167 case MTD_FILE_MODE_RAW:
168 {
169 struct mtd_oob_ops ops = {};
170
171 ops.mode = MTD_OPS_RAW;
172 ops.datbuf = kbuf;
173 ops.oobbuf = NULL;
174 ops.len = len;
175
176 ret = mtd_read_oob(mtd, *ppos, &ops);
177 retlen = ops.retlen;
178 break;
179 }
180 default:
181 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
182 }
183 /* Nand returns -EBADMSG on ECC errors, but it returns
184 * the data. For our userspace tools it is important
185 * to dump areas with ECC errors!
186 * For kernel internal usage it also might return -EUCLEAN
187 * to signal the caller that a bitflip has occurred and has
188 * been corrected by the ECC algorithm.
189 * Userspace software which accesses NAND this way
190 * must be aware of the fact that it deals with NAND
191 */
192 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
193 *ppos += retlen;
194 if (copy_to_user(buf, kbuf, retlen)) {
195 kfree(kbuf);
196 return -EFAULT;
197 }
198 else
199 total_retlen += retlen;
200
201 count -= retlen;
202 buf += retlen;
203 if (retlen == 0)
204 count = 0;
205 }
206 else {
207 kfree(kbuf);
208 return ret;
209 }
210
211 }
212
213 kfree(kbuf);
214 return total_retlen;
215} /* mtdchar_read */
216
217static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
218 loff_t *ppos)
219{
220 struct mtd_file_info *mfi = file->private_data;
221 struct mtd_info *mtd = mfi->mtd;
222 size_t size = count;
223 char *kbuf;
224 size_t retlen;
225 size_t total_retlen=0;
226 int ret=0;
227 int len;
228
229 pr_debug("MTD_write\n");
230
231 if (*ppos >= mtd->size)
232 return -ENOSPC;
233
234 if (*ppos + count > mtd->size)
235 count = mtd->size - *ppos;
236
237 if (!count)
238 return 0;
239
240 kbuf = mtd_kmalloc_up_to(mtd, &size);
241 if (!kbuf)
242 return -ENOMEM;
243
244 while (count) {
245 len = min_t(size_t, count, size);
246
247 if (copy_from_user(kbuf, buf, len)) {
248 kfree(kbuf);
249 return -EFAULT;
250 }
251
252 switch (mfi->mode) {
253 case MTD_FILE_MODE_OTP_FACTORY:
254 ret = -EROFS;
255 break;
256 case MTD_FILE_MODE_OTP_USER:
257 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
258 &retlen, kbuf);
259 break;
260
261 case MTD_FILE_MODE_RAW:
262 {
263 struct mtd_oob_ops ops = {};
264
265 ops.mode = MTD_OPS_RAW;
266 ops.datbuf = kbuf;
267 ops.oobbuf = NULL;
268 ops.ooboffs = 0;
269 ops.len = len;
270
271 ret = mtd_write_oob(mtd, *ppos, &ops);
272 retlen = ops.retlen;
273 break;
274 }
275
276 default:
277 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
278 }
279
280 /*
281 * Return -ENOSPC only if no data could be written at all.
282 * Otherwise just return the number of bytes that actually
283 * have been written.
284 */
285 if ((ret == -ENOSPC) && (total_retlen))
286 break;
287
288 if (!ret) {
289 *ppos += retlen;
290 total_retlen += retlen;
291 count -= retlen;
292 buf += retlen;
293 }
294 else {
295 kfree(kbuf);
296 return ret;
297 }
298 }
299
300 kfree(kbuf);
301 return total_retlen;
302} /* mtdchar_write */
303
304/*======================================================================
305
306 IOCTL calls for getting device parameters.
307
308======================================================================*/
309
310static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
311{
312 struct mtd_info *mtd = mfi->mtd;
313 size_t retlen;
314
315 switch (mode) {
316 case MTD_OTP_FACTORY:
317 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
318 -EOPNOTSUPP)
319 return -EOPNOTSUPP;
320
321 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
322 break;
323 case MTD_OTP_USER:
324 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
325 -EOPNOTSUPP)
326 return -EOPNOTSUPP;
327
328 mfi->mode = MTD_FILE_MODE_OTP_USER;
329 break;
330 case MTD_OTP_OFF:
331 mfi->mode = MTD_FILE_MODE_NORMAL;
332 break;
333 default:
334 return -EINVAL;
335 }
336
337 return 0;
338}
339
340static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
341 uint64_t start, uint32_t length, void __user *ptr,
342 uint32_t __user *retp)
343{
344 struct mtd_info *master = mtd_get_master(mtd);
345 struct mtd_file_info *mfi = file->private_data;
346 struct mtd_oob_ops ops = {};
347 uint32_t retlen;
348 int ret = 0;
349
350 if (length > 4096)
351 return -EINVAL;
352
353 if (!master->_write_oob)
354 return -EOPNOTSUPP;
355
356 ops.ooblen = length;
357 ops.ooboffs = start & (mtd->writesize - 1);
358 ops.datbuf = NULL;
359 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
360 MTD_OPS_PLACE_OOB;
361
362 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
363 return -EINVAL;
364
365 ops.oobbuf = memdup_user(ptr, length);
366 if (IS_ERR(ops.oobbuf))
367 return PTR_ERR(ops.oobbuf);
368
369 start &= ~((uint64_t)mtd->writesize - 1);
370 ret = mtd_write_oob(mtd, start, &ops);
371
372 if (ops.oobretlen > 0xFFFFFFFFU)
373 ret = -EOVERFLOW;
374 retlen = ops.oobretlen;
375 if (copy_to_user(retp, &retlen, sizeof(length)))
376 ret = -EFAULT;
377
378 kfree(ops.oobbuf);
379 return ret;
380}
381
382static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
383 uint64_t start, uint32_t length, void __user *ptr,
384 uint32_t __user *retp)
385{
386 struct mtd_file_info *mfi = file->private_data;
387 struct mtd_oob_ops ops = {};
388 int ret = 0;
389
390 if (length > 4096)
391 return -EINVAL;
392
393 ops.ooblen = length;
394 ops.ooboffs = start & (mtd->writesize - 1);
395 ops.datbuf = NULL;
396 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
397 MTD_OPS_PLACE_OOB;
398
399 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
400 return -EINVAL;
401
402 ops.oobbuf = kmalloc(length, GFP_KERNEL);
403 if (!ops.oobbuf)
404 return -ENOMEM;
405
406 start &= ~((uint64_t)mtd->writesize - 1);
407 ret = mtd_read_oob(mtd, start, &ops);
408
409 if (put_user(ops.oobretlen, retp))
410 ret = -EFAULT;
411 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
412 ops.oobretlen))
413 ret = -EFAULT;
414
415 kfree(ops.oobbuf);
416
417 /*
418 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
419 * data. For our userspace tools it is important to dump areas
420 * with ECC errors!
421 * For kernel internal usage it also might return -EUCLEAN
422 * to signal the caller that a bitflip has occurred and has
423 * been corrected by the ECC algorithm.
424 *
425 * Note: currently the standard NAND function, nand_read_oob_std,
426 * does not calculate ECC for the OOB area, so do not rely on
427 * this behavior unless you have replaced it with your own.
428 */
429 if (mtd_is_bitflip_or_eccerr(ret))
430 return 0;
431
432 return ret;
433}
434
435/*
436 * Copies (and truncates, if necessary) OOB layout information to the
437 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
438 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
439 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
440 * can describe any kind of OOB layout with almost zero overhead from a
441 * memory usage point of view).
442 */
443static int shrink_ecclayout(struct mtd_info *mtd,
444 struct nand_ecclayout_user *to)
445{
446 struct mtd_oob_region oobregion;
447 int i, section = 0, ret;
448
449 if (!mtd || !to)
450 return -EINVAL;
451
452 memset(to, 0, sizeof(*to));
453
454 to->eccbytes = 0;
455 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
456 u32 eccpos;
457
458 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
459 if (ret < 0) {
460 if (ret != -ERANGE)
461 return ret;
462
463 break;
464 }
465
466 eccpos = oobregion.offset;
467 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
468 eccpos < oobregion.offset + oobregion.length; i++) {
469 to->eccpos[i] = eccpos++;
470 to->eccbytes++;
471 }
472 }
473
474 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
475 ret = mtd_ooblayout_free(mtd, i, &oobregion);
476 if (ret < 0) {
477 if (ret != -ERANGE)
478 return ret;
479
480 break;
481 }
482
483 to->oobfree[i].offset = oobregion.offset;
484 to->oobfree[i].length = oobregion.length;
485 to->oobavail += to->oobfree[i].length;
486 }
487
488 return 0;
489}
490
491static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
492{
493 struct mtd_oob_region oobregion;
494 int i, section = 0, ret;
495
496 if (!mtd || !to)
497 return -EINVAL;
498
499 memset(to, 0, sizeof(*to));
500
501 to->eccbytes = 0;
502 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
503 u32 eccpos;
504
505 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
506 if (ret < 0) {
507 if (ret != -ERANGE)
508 return ret;
509
510 break;
511 }
512
513 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
514 return -EINVAL;
515
516 eccpos = oobregion.offset;
517 for (; eccpos < oobregion.offset + oobregion.length; i++) {
518 to->eccpos[i] = eccpos++;
519 to->eccbytes++;
520 }
521 }
522
523 for (i = 0; i < 8; i++) {
524 ret = mtd_ooblayout_free(mtd, i, &oobregion);
525 if (ret < 0) {
526 if (ret != -ERANGE)
527 return ret;
528
529 break;
530 }
531
532 to->oobfree[i][0] = oobregion.offset;
533 to->oobfree[i][1] = oobregion.length;
534 }
535
536 to->useecc = MTD_NANDECC_AUTOPLACE;
537
538 return 0;
539}
540
541static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
542 struct blkpg_ioctl_arg *arg)
543{
544 struct blkpg_partition p;
545
546 if (!capable(CAP_SYS_ADMIN))
547 return -EPERM;
548
549 if (copy_from_user(&p, arg->data, sizeof(p)))
550 return -EFAULT;
551
552 switch (arg->op) {
553 case BLKPG_ADD_PARTITION:
554
555 /* Only master mtd device must be used to add partitions */
556 if (mtd_is_partition(mtd))
557 return -EINVAL;
558
559 /* Sanitize user input */
560 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
561
562 return mtd_add_partition(mtd, p.devname, p.start, p.length);
563
564 case BLKPG_DEL_PARTITION:
565
566 if (p.pno < 0)
567 return -EINVAL;
568
569 return mtd_del_partition(mtd, p.pno);
570
571 default:
572 return -EINVAL;
573 }
574}
575
576static void adjust_oob_length(struct mtd_info *mtd, uint64_t start,
577 struct mtd_oob_ops *ops)
578{
579 uint32_t start_page, end_page;
580 u32 oob_per_page;
581
582 if (ops->len == 0 || ops->ooblen == 0)
583 return;
584
585 start_page = mtd_div_by_ws(start, mtd);
586 end_page = mtd_div_by_ws(start + ops->len - 1, mtd);
587 oob_per_page = mtd_oobavail(mtd, ops);
588
589 ops->ooblen = min_t(size_t, ops->ooblen,
590 (end_page - start_page + 1) * oob_per_page);
591}
592
593static int mtdchar_write_ioctl(struct mtd_info *mtd,
594 struct mtd_write_req __user *argp)
595{
596 struct mtd_info *master = mtd_get_master(mtd);
597 struct mtd_write_req req;
598 const void __user *usr_data, *usr_oob;
599 uint8_t *datbuf = NULL, *oobbuf = NULL;
600 size_t datbuf_len, oobbuf_len;
601 int ret = 0;
602
603 if (copy_from_user(&req, argp, sizeof(req)))
604 return -EFAULT;
605
606 usr_data = (const void __user *)(uintptr_t)req.usr_data;
607 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
608
609 if (!master->_write_oob)
610 return -EOPNOTSUPP;
611
612 if (!usr_data)
613 req.len = 0;
614
615 if (!usr_oob)
616 req.ooblen = 0;
617
618 req.len &= 0xffffffff;
619 req.ooblen &= 0xffffffff;
620
621 if (req.start + req.len > mtd->size)
622 return -EINVAL;
623
624 datbuf_len = min_t(size_t, req.len, mtd->erasesize);
625 if (datbuf_len > 0) {
626 datbuf = kvmalloc(datbuf_len, GFP_KERNEL);
627 if (!datbuf)
628 return -ENOMEM;
629 }
630
631 oobbuf_len = min_t(size_t, req.ooblen, mtd->erasesize);
632 if (oobbuf_len > 0) {
633 oobbuf = kvmalloc(oobbuf_len, GFP_KERNEL);
634 if (!oobbuf) {
635 kvfree(datbuf);
636 return -ENOMEM;
637 }
638 }
639
640 while (req.len > 0 || (!usr_data && req.ooblen > 0)) {
641 struct mtd_oob_ops ops = {
642 .mode = req.mode,
643 .len = min_t(size_t, req.len, datbuf_len),
644 .ooblen = min_t(size_t, req.ooblen, oobbuf_len),
645 .datbuf = datbuf,
646 .oobbuf = oobbuf,
647 };
648
649 /*
650 * Shorten non-page-aligned, eraseblock-sized writes so that
651 * the write ends on an eraseblock boundary. This is necessary
652 * for adjust_oob_length() to properly handle non-page-aligned
653 * writes.
654 */
655 if (ops.len == mtd->erasesize)
656 ops.len -= mtd_mod_by_ws(req.start + ops.len, mtd);
657
658 /*
659 * For writes which are not OOB-only, adjust the amount of OOB
660 * data written according to the number of data pages written.
661 * This is necessary to prevent OOB data from being skipped
662 * over in data+OOB writes requiring multiple mtd_write_oob()
663 * calls to be completed.
664 */
665 adjust_oob_length(mtd, req.start, &ops);
666
667 if (copy_from_user(datbuf, usr_data, ops.len) ||
668 copy_from_user(oobbuf, usr_oob, ops.ooblen)) {
669 ret = -EFAULT;
670 break;
671 }
672
673 ret = mtd_write_oob(mtd, req.start, &ops);
674 if (ret)
675 break;
676
677 req.start += ops.retlen;
678 req.len -= ops.retlen;
679 usr_data += ops.retlen;
680
681 req.ooblen -= ops.oobretlen;
682 usr_oob += ops.oobretlen;
683 }
684
685 kvfree(datbuf);
686 kvfree(oobbuf);
687
688 return ret;
689}
690
691static int mtdchar_read_ioctl(struct mtd_info *mtd,
692 struct mtd_read_req __user *argp)
693{
694 struct mtd_info *master = mtd_get_master(mtd);
695 struct mtd_read_req req;
696 void __user *usr_data, *usr_oob;
697 uint8_t *datbuf = NULL, *oobbuf = NULL;
698 size_t datbuf_len, oobbuf_len;
699 size_t orig_len, orig_ooblen;
700 int ret = 0;
701
702 if (copy_from_user(&req, argp, sizeof(req)))
703 return -EFAULT;
704
705 orig_len = req.len;
706 orig_ooblen = req.ooblen;
707
708 usr_data = (void __user *)(uintptr_t)req.usr_data;
709 usr_oob = (void __user *)(uintptr_t)req.usr_oob;
710
711 if (!master->_read_oob)
712 return -EOPNOTSUPP;
713
714 if (!usr_data)
715 req.len = 0;
716
717 if (!usr_oob)
718 req.ooblen = 0;
719
720 req.ecc_stats.uncorrectable_errors = 0;
721 req.ecc_stats.corrected_bitflips = 0;
722 req.ecc_stats.max_bitflips = 0;
723
724 req.len &= 0xffffffff;
725 req.ooblen &= 0xffffffff;
726
727 if (req.start + req.len > mtd->size) {
728 ret = -EINVAL;
729 goto out;
730 }
731
732 datbuf_len = min_t(size_t, req.len, mtd->erasesize);
733 if (datbuf_len > 0) {
734 datbuf = kvmalloc(datbuf_len, GFP_KERNEL);
735 if (!datbuf) {
736 ret = -ENOMEM;
737 goto out;
738 }
739 }
740
741 oobbuf_len = min_t(size_t, req.ooblen, mtd->erasesize);
742 if (oobbuf_len > 0) {
743 oobbuf = kvmalloc(oobbuf_len, GFP_KERNEL);
744 if (!oobbuf) {
745 ret = -ENOMEM;
746 goto out;
747 }
748 }
749
750 while (req.len > 0 || (!usr_data && req.ooblen > 0)) {
751 struct mtd_req_stats stats;
752 struct mtd_oob_ops ops = {
753 .mode = req.mode,
754 .len = min_t(size_t, req.len, datbuf_len),
755 .ooblen = min_t(size_t, req.ooblen, oobbuf_len),
756 .datbuf = datbuf,
757 .oobbuf = oobbuf,
758 .stats = &stats,
759 };
760
761 /*
762 * Shorten non-page-aligned, eraseblock-sized reads so that the
763 * read ends on an eraseblock boundary. This is necessary in
764 * order to prevent OOB data for some pages from being
765 * duplicated in the output of non-page-aligned reads requiring
766 * multiple mtd_read_oob() calls to be completed.
767 */
768 if (ops.len == mtd->erasesize)
769 ops.len -= mtd_mod_by_ws(req.start + ops.len, mtd);
770
771 ret = mtd_read_oob(mtd, (loff_t)req.start, &ops);
772
773 req.ecc_stats.uncorrectable_errors +=
774 stats.uncorrectable_errors;
775 req.ecc_stats.corrected_bitflips += stats.corrected_bitflips;
776 req.ecc_stats.max_bitflips =
777 max(req.ecc_stats.max_bitflips, stats.max_bitflips);
778
779 if (ret && !mtd_is_bitflip_or_eccerr(ret))
780 break;
781
782 if (copy_to_user(usr_data, ops.datbuf, ops.retlen) ||
783 copy_to_user(usr_oob, ops.oobbuf, ops.oobretlen)) {
784 ret = -EFAULT;
785 break;
786 }
787
788 req.start += ops.retlen;
789 req.len -= ops.retlen;
790 usr_data += ops.retlen;
791
792 req.ooblen -= ops.oobretlen;
793 usr_oob += ops.oobretlen;
794 }
795
796 /*
797 * As multiple iterations of the above loop (and therefore multiple
798 * mtd_read_oob() calls) may be necessary to complete the read request,
799 * adjust the final return code to ensure it accounts for all detected
800 * ECC errors.
801 */
802 if (!ret || mtd_is_bitflip(ret)) {
803 if (req.ecc_stats.uncorrectable_errors > 0)
804 ret = -EBADMSG;
805 else if (req.ecc_stats.corrected_bitflips > 0)
806 ret = -EUCLEAN;
807 }
808
809out:
810 req.len = orig_len - req.len;
811 req.ooblen = orig_ooblen - req.ooblen;
812
813 if (copy_to_user(argp, &req, sizeof(req)))
814 ret = -EFAULT;
815
816 kvfree(datbuf);
817 kvfree(oobbuf);
818
819 return ret;
820}
821
822static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
823{
824 struct mtd_file_info *mfi = file->private_data;
825 struct mtd_info *mtd = mfi->mtd;
826 struct mtd_info *master = mtd_get_master(mtd);
827 void __user *argp = (void __user *)arg;
828 int ret = 0;
829 struct mtd_info_user info;
830
831 pr_debug("MTD_ioctl\n");
832
833 /*
834 * Check the file mode to require "dangerous" commands to have write
835 * permissions.
836 */
837 switch (cmd) {
838 /* "safe" commands */
839 case MEMGETREGIONCOUNT:
840 case MEMGETREGIONINFO:
841 case MEMGETINFO:
842 case MEMREADOOB:
843 case MEMREADOOB64:
844 case MEMREAD:
845 case MEMISLOCKED:
846 case MEMGETOOBSEL:
847 case MEMGETBADBLOCK:
848 case OTPSELECT:
849 case OTPGETREGIONCOUNT:
850 case OTPGETREGIONINFO:
851 case ECCGETLAYOUT:
852 case ECCGETSTATS:
853 case MTDFILEMODE:
854 case BLKPG:
855 case BLKRRPART:
856 break;
857
858 /* "dangerous" commands */
859 case MEMERASE:
860 case MEMERASE64:
861 case MEMLOCK:
862 case MEMUNLOCK:
863 case MEMSETBADBLOCK:
864 case MEMWRITEOOB:
865 case MEMWRITEOOB64:
866 case MEMWRITE:
867 case OTPLOCK:
868 case OTPERASE:
869 if (!(file->f_mode & FMODE_WRITE))
870 return -EPERM;
871 break;
872
873 default:
874 return -ENOTTY;
875 }
876
877 switch (cmd) {
878 case MEMGETREGIONCOUNT:
879 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
880 return -EFAULT;
881 break;
882
883 case MEMGETREGIONINFO:
884 {
885 uint32_t ur_idx;
886 struct mtd_erase_region_info *kr;
887 struct region_info_user __user *ur = argp;
888
889 if (get_user(ur_idx, &(ur->regionindex)))
890 return -EFAULT;
891
892 if (ur_idx >= mtd->numeraseregions)
893 return -EINVAL;
894
895 kr = &(mtd->eraseregions[ur_idx]);
896
897 if (put_user(kr->offset, &(ur->offset))
898 || put_user(kr->erasesize, &(ur->erasesize))
899 || put_user(kr->numblocks, &(ur->numblocks)))
900 return -EFAULT;
901
902 break;
903 }
904
905 case MEMGETINFO:
906 memset(&info, 0, sizeof(info));
907 info.type = mtd->type;
908 info.flags = mtd->flags;
909 info.size = mtd->size;
910 info.erasesize = mtd->erasesize;
911 info.writesize = mtd->writesize;
912 info.oobsize = mtd->oobsize;
913 /* The below field is obsolete */
914 info.padding = 0;
915 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
916 return -EFAULT;
917 break;
918
919 case MEMERASE:
920 case MEMERASE64:
921 {
922 struct erase_info *erase;
923
924 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
925 if (!erase)
926 ret = -ENOMEM;
927 else {
928 if (cmd == MEMERASE64) {
929 struct erase_info_user64 einfo64;
930
931 if (copy_from_user(&einfo64, argp,
932 sizeof(struct erase_info_user64))) {
933 kfree(erase);
934 return -EFAULT;
935 }
936 erase->addr = einfo64.start;
937 erase->len = einfo64.length;
938 } else {
939 struct erase_info_user einfo32;
940
941 if (copy_from_user(&einfo32, argp,
942 sizeof(struct erase_info_user))) {
943 kfree(erase);
944 return -EFAULT;
945 }
946 erase->addr = einfo32.start;
947 erase->len = einfo32.length;
948 }
949
950 ret = mtd_erase(mtd, erase);
951 kfree(erase);
952 }
953 break;
954 }
955
956 case MEMWRITEOOB:
957 {
958 struct mtd_oob_buf buf;
959 struct mtd_oob_buf __user *buf_user = argp;
960
961 /* NOTE: writes return length to buf_user->length */
962 if (copy_from_user(&buf, argp, sizeof(buf)))
963 ret = -EFAULT;
964 else
965 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
966 buf.ptr, &buf_user->length);
967 break;
968 }
969
970 case MEMREADOOB:
971 {
972 struct mtd_oob_buf buf;
973 struct mtd_oob_buf __user *buf_user = argp;
974
975 /* NOTE: writes return length to buf_user->start */
976 if (copy_from_user(&buf, argp, sizeof(buf)))
977 ret = -EFAULT;
978 else
979 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
980 buf.ptr, &buf_user->start);
981 break;
982 }
983
984 case MEMWRITEOOB64:
985 {
986 struct mtd_oob_buf64 buf;
987 struct mtd_oob_buf64 __user *buf_user = argp;
988
989 if (copy_from_user(&buf, argp, sizeof(buf)))
990 ret = -EFAULT;
991 else
992 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
993 (void __user *)(uintptr_t)buf.usr_ptr,
994 &buf_user->length);
995 break;
996 }
997
998 case MEMREADOOB64:
999 {
1000 struct mtd_oob_buf64 buf;
1001 struct mtd_oob_buf64 __user *buf_user = argp;
1002
1003 if (copy_from_user(&buf, argp, sizeof(buf)))
1004 ret = -EFAULT;
1005 else
1006 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
1007 (void __user *)(uintptr_t)buf.usr_ptr,
1008 &buf_user->length);
1009 break;
1010 }
1011
1012 case MEMWRITE:
1013 {
1014 ret = mtdchar_write_ioctl(mtd,
1015 (struct mtd_write_req __user *)arg);
1016 break;
1017 }
1018
1019 case MEMREAD:
1020 {
1021 ret = mtdchar_read_ioctl(mtd,
1022 (struct mtd_read_req __user *)arg);
1023 break;
1024 }
1025
1026 case MEMLOCK:
1027 {
1028 struct erase_info_user einfo;
1029
1030 if (copy_from_user(&einfo, argp, sizeof(einfo)))
1031 return -EFAULT;
1032
1033 ret = mtd_lock(mtd, einfo.start, einfo.length);
1034 break;
1035 }
1036
1037 case MEMUNLOCK:
1038 {
1039 struct erase_info_user einfo;
1040
1041 if (copy_from_user(&einfo, argp, sizeof(einfo)))
1042 return -EFAULT;
1043
1044 ret = mtd_unlock(mtd, einfo.start, einfo.length);
1045 break;
1046 }
1047
1048 case MEMISLOCKED:
1049 {
1050 struct erase_info_user einfo;
1051
1052 if (copy_from_user(&einfo, argp, sizeof(einfo)))
1053 return -EFAULT;
1054
1055 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
1056 break;
1057 }
1058
1059 /* Legacy interface */
1060 case MEMGETOOBSEL:
1061 {
1062 struct nand_oobinfo oi;
1063
1064 if (!master->ooblayout)
1065 return -EOPNOTSUPP;
1066
1067 ret = get_oobinfo(mtd, &oi);
1068 if (ret)
1069 return ret;
1070
1071 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
1072 return -EFAULT;
1073 break;
1074 }
1075
1076 case MEMGETBADBLOCK:
1077 {
1078 loff_t offs;
1079
1080 if (copy_from_user(&offs, argp, sizeof(loff_t)))
1081 return -EFAULT;
1082 return mtd_block_isbad(mtd, offs);
1083 }
1084
1085 case MEMSETBADBLOCK:
1086 {
1087 loff_t offs;
1088
1089 if (copy_from_user(&offs, argp, sizeof(loff_t)))
1090 return -EFAULT;
1091 return mtd_block_markbad(mtd, offs);
1092 }
1093
1094 case OTPSELECT:
1095 {
1096 int mode;
1097 if (copy_from_user(&mode, argp, sizeof(int)))
1098 return -EFAULT;
1099
1100 mfi->mode = MTD_FILE_MODE_NORMAL;
1101
1102 ret = otp_select_filemode(mfi, mode);
1103
1104 file->f_pos = 0;
1105 break;
1106 }
1107
1108 case OTPGETREGIONCOUNT:
1109 case OTPGETREGIONINFO:
1110 {
1111 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
1112 size_t retlen;
1113 if (!buf)
1114 return -ENOMEM;
1115 switch (mfi->mode) {
1116 case MTD_FILE_MODE_OTP_FACTORY:
1117 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
1118 break;
1119 case MTD_FILE_MODE_OTP_USER:
1120 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
1121 break;
1122 default:
1123 ret = -EINVAL;
1124 break;
1125 }
1126 if (!ret) {
1127 if (cmd == OTPGETREGIONCOUNT) {
1128 int nbr = retlen / sizeof(struct otp_info);
1129 ret = copy_to_user(argp, &nbr, sizeof(int));
1130 } else
1131 ret = copy_to_user(argp, buf, retlen);
1132 if (ret)
1133 ret = -EFAULT;
1134 }
1135 kfree(buf);
1136 break;
1137 }
1138
1139 case OTPLOCK:
1140 case OTPERASE:
1141 {
1142 struct otp_info oinfo;
1143
1144 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
1145 return -EINVAL;
1146 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
1147 return -EFAULT;
1148 if (cmd == OTPLOCK)
1149 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
1150 else
1151 ret = mtd_erase_user_prot_reg(mtd, oinfo.start, oinfo.length);
1152 break;
1153 }
1154
1155 /* This ioctl is being deprecated - it truncates the ECC layout */
1156 case ECCGETLAYOUT:
1157 {
1158 struct nand_ecclayout_user *usrlay;
1159
1160 if (!master->ooblayout)
1161 return -EOPNOTSUPP;
1162
1163 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
1164 if (!usrlay)
1165 return -ENOMEM;
1166
1167 shrink_ecclayout(mtd, usrlay);
1168
1169 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
1170 ret = -EFAULT;
1171 kfree(usrlay);
1172 break;
1173 }
1174
1175 case ECCGETSTATS:
1176 {
1177 if (copy_to_user(argp, &mtd->ecc_stats,
1178 sizeof(struct mtd_ecc_stats)))
1179 return -EFAULT;
1180 break;
1181 }
1182
1183 case MTDFILEMODE:
1184 {
1185 mfi->mode = 0;
1186
1187 switch(arg) {
1188 case MTD_FILE_MODE_OTP_FACTORY:
1189 case MTD_FILE_MODE_OTP_USER:
1190 ret = otp_select_filemode(mfi, arg);
1191 break;
1192
1193 case MTD_FILE_MODE_RAW:
1194 if (!mtd_has_oob(mtd))
1195 return -EOPNOTSUPP;
1196 mfi->mode = arg;
1197 break;
1198
1199 case MTD_FILE_MODE_NORMAL:
1200 break;
1201 default:
1202 ret = -EINVAL;
1203 }
1204 file->f_pos = 0;
1205 break;
1206 }
1207
1208 case BLKPG:
1209 {
1210 struct blkpg_ioctl_arg __user *blk_arg = argp;
1211 struct blkpg_ioctl_arg a;
1212
1213 if (copy_from_user(&a, blk_arg, sizeof(a)))
1214 ret = -EFAULT;
1215 else
1216 ret = mtdchar_blkpg_ioctl(mtd, &a);
1217 break;
1218 }
1219
1220 case BLKRRPART:
1221 {
1222 /* No reread partition feature. Just return ok */
1223 ret = 0;
1224 break;
1225 }
1226 }
1227
1228 return ret;
1229} /* memory_ioctl */
1230
1231static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1232{
1233 struct mtd_file_info *mfi = file->private_data;
1234 struct mtd_info *mtd = mfi->mtd;
1235 struct mtd_info *master = mtd_get_master(mtd);
1236 int ret;
1237
1238 mutex_lock(&master->master.chrdev_lock);
1239 ret = mtdchar_ioctl(file, cmd, arg);
1240 mutex_unlock(&master->master.chrdev_lock);
1241
1242 return ret;
1243}
1244
1245#ifdef CONFIG_COMPAT
1246
1247struct mtd_oob_buf32 {
1248 u_int32_t start;
1249 u_int32_t length;
1250 compat_caddr_t ptr; /* unsigned char* */
1251};
1252
1253#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1254#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1255
1256static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1257 unsigned long arg)
1258{
1259 struct mtd_file_info *mfi = file->private_data;
1260 struct mtd_info *mtd = mfi->mtd;
1261 struct mtd_info *master = mtd_get_master(mtd);
1262 void __user *argp = compat_ptr(arg);
1263 int ret = 0;
1264
1265 mutex_lock(&master->master.chrdev_lock);
1266
1267 switch (cmd) {
1268 case MEMWRITEOOB32:
1269 {
1270 struct mtd_oob_buf32 buf;
1271 struct mtd_oob_buf32 __user *buf_user = argp;
1272
1273 if (!(file->f_mode & FMODE_WRITE)) {
1274 ret = -EPERM;
1275 break;
1276 }
1277
1278 if (copy_from_user(&buf, argp, sizeof(buf)))
1279 ret = -EFAULT;
1280 else
1281 ret = mtdchar_writeoob(file, mtd, buf.start,
1282 buf.length, compat_ptr(buf.ptr),
1283 &buf_user->length);
1284 break;
1285 }
1286
1287 case MEMREADOOB32:
1288 {
1289 struct mtd_oob_buf32 buf;
1290 struct mtd_oob_buf32 __user *buf_user = argp;
1291
1292 /* NOTE: writes return length to buf->start */
1293 if (copy_from_user(&buf, argp, sizeof(buf)))
1294 ret = -EFAULT;
1295 else
1296 ret = mtdchar_readoob(file, mtd, buf.start,
1297 buf.length, compat_ptr(buf.ptr),
1298 &buf_user->start);
1299 break;
1300 }
1301
1302 case BLKPG:
1303 {
1304 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1305 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1306 struct blkpg_compat_ioctl_arg compat_arg;
1307 struct blkpg_ioctl_arg a;
1308
1309 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1310 ret = -EFAULT;
1311 break;
1312 }
1313
1314 memset(&a, 0, sizeof(a));
1315 a.op = compat_arg.op;
1316 a.flags = compat_arg.flags;
1317 a.datalen = compat_arg.datalen;
1318 a.data = compat_ptr(compat_arg.data);
1319
1320 ret = mtdchar_blkpg_ioctl(mtd, &a);
1321 break;
1322 }
1323
1324 default:
1325 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1326 }
1327
1328 mutex_unlock(&master->master.chrdev_lock);
1329
1330 return ret;
1331}
1332
1333#endif /* CONFIG_COMPAT */
1334
1335/*
1336 * try to determine where a shared mapping can be made
1337 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1338 * mappings)
1339 */
1340#ifndef CONFIG_MMU
1341static unsigned long mtdchar_get_unmapped_area(struct file *file,
1342 unsigned long addr,
1343 unsigned long len,
1344 unsigned long pgoff,
1345 unsigned long flags)
1346{
1347 struct mtd_file_info *mfi = file->private_data;
1348 struct mtd_info *mtd = mfi->mtd;
1349 unsigned long offset;
1350 int ret;
1351
1352 if (addr != 0)
1353 return (unsigned long) -EINVAL;
1354
1355 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1356 return (unsigned long) -EINVAL;
1357
1358 offset = pgoff << PAGE_SHIFT;
1359 if (offset > mtd->size - len)
1360 return (unsigned long) -EINVAL;
1361
1362 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1363 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1364}
1365
1366static unsigned mtdchar_mmap_capabilities(struct file *file)
1367{
1368 struct mtd_file_info *mfi = file->private_data;
1369
1370 return mtd_mmap_capabilities(mfi->mtd);
1371}
1372#endif
1373
1374/*
1375 * set up a mapping for shared memory segments
1376 */
1377static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1378{
1379#ifdef CONFIG_MMU
1380 struct mtd_file_info *mfi = file->private_data;
1381 struct mtd_info *mtd = mfi->mtd;
1382 struct map_info *map = mtd->priv;
1383
1384 /* This is broken because it assumes the MTD device is map-based
1385 and that mtd->priv is a valid struct map_info. It should be
1386 replaced with something that uses the mtd_get_unmapped_area()
1387 operation properly. */
1388 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1389#ifdef pgprot_noncached
1390 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1391 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1392#endif
1393 return vm_iomap_memory(vma, map->phys, map->size);
1394 }
1395 return -ENODEV;
1396#else
1397 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1398#endif
1399}
1400
1401static const struct file_operations mtd_fops = {
1402 .owner = THIS_MODULE,
1403 .llseek = mtdchar_lseek,
1404 .read = mtdchar_read,
1405 .write = mtdchar_write,
1406 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1407#ifdef CONFIG_COMPAT
1408 .compat_ioctl = mtdchar_compat_ioctl,
1409#endif
1410 .open = mtdchar_open,
1411 .release = mtdchar_close,
1412 .mmap = mtdchar_mmap,
1413#ifndef CONFIG_MMU
1414 .get_unmapped_area = mtdchar_get_unmapped_area,
1415 .mmap_capabilities = mtdchar_mmap_capabilities,
1416#endif
1417};
1418
1419int __init init_mtdchar(void)
1420{
1421 int ret;
1422
1423 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1424 "mtd", &mtd_fops);
1425 if (ret < 0) {
1426 pr_err("Can't allocate major number %d for MTD\n",
1427 MTD_CHAR_MAJOR);
1428 return ret;
1429 }
1430
1431 return ret;
1432}
1433
1434void __exit cleanup_mtdchar(void)
1435{
1436 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1437}
1438
1439MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);