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 static 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 */
36 struct mtd_file_info {
37 struct mtd_info *mtd;
38 enum mtd_file_modes mode;
39 };
40
mtdchar_lseek(struct file * file,loff_t offset,int orig)41 static 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
mtdchar_open(struct inode * inode,struct file * file)47 static 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
90 out1:
91 put_mtd_device(mtd);
92 out:
93 mutex_unlock(&mtd_mutex);
94 return ret;
95 } /* mtdchar_open */
96
97 /*====================================================================*/
98
mtdchar_close(struct inode * inode,struct file * file)99 static 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
mtdchar_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)135 static 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
mtdchar_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)225 static 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
otp_select_filemode(struct mtd_file_info * mfi,int mode)318 static 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
mtdchar_writeoob(struct file * file,struct mtd_info * mtd,uint64_t start,uint32_t length,void __user * ptr,uint32_t __user * retp)348 static 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 (length > 4096)
358 return -EINVAL;
359
360 if (!mtd->_write_oob)
361 return -EOPNOTSUPP;
362
363 ops.ooblen = length;
364 ops.ooboffs = start & (mtd->writesize - 1);
365 ops.datbuf = NULL;
366 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
367 MTD_OPS_PLACE_OOB;
368
369 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
370 return -EINVAL;
371
372 ops.oobbuf = memdup_user(ptr, length);
373 if (IS_ERR(ops.oobbuf))
374 return PTR_ERR(ops.oobbuf);
375
376 start &= ~((uint64_t)mtd->writesize - 1);
377 ret = mtd_write_oob(mtd, start, &ops);
378
379 if (ops.oobretlen > 0xFFFFFFFFU)
380 ret = -EOVERFLOW;
381 retlen = ops.oobretlen;
382 if (copy_to_user(retp, &retlen, sizeof(length)))
383 ret = -EFAULT;
384
385 kfree(ops.oobbuf);
386 return ret;
387 }
388
mtdchar_readoob(struct file * file,struct mtd_info * mtd,uint64_t start,uint32_t length,void __user * ptr,uint32_t __user * retp)389 static int mtdchar_readoob(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_file_info *mfi = file->private_data;
394 struct mtd_oob_ops ops;
395 int ret = 0;
396
397 if (length > 4096)
398 return -EINVAL;
399
400 ops.ooblen = length;
401 ops.ooboffs = start & (mtd->writesize - 1);
402 ops.datbuf = NULL;
403 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
404 MTD_OPS_PLACE_OOB;
405
406 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
407 return -EINVAL;
408
409 ops.oobbuf = kmalloc(length, GFP_KERNEL);
410 if (!ops.oobbuf)
411 return -ENOMEM;
412
413 start &= ~((uint64_t)mtd->writesize - 1);
414 ret = mtd_read_oob(mtd, start, &ops);
415
416 if (put_user(ops.oobretlen, retp))
417 ret = -EFAULT;
418 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
419 ops.oobretlen))
420 ret = -EFAULT;
421
422 kfree(ops.oobbuf);
423
424 /*
425 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
426 * data. For our userspace tools it is important to dump areas
427 * with ECC errors!
428 * For kernel internal usage it also might return -EUCLEAN
429 * to signal the caller that a bitflip has occurred and has
430 * been corrected by the ECC algorithm.
431 *
432 * Note: currently the standard NAND function, nand_read_oob_std,
433 * does not calculate ECC for the OOB area, so do not rely on
434 * this behavior unless you have replaced it with your own.
435 */
436 if (mtd_is_bitflip_or_eccerr(ret))
437 return 0;
438
439 return ret;
440 }
441
442 /*
443 * Copies (and truncates, if necessary) OOB layout information to the
444 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
445 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
446 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
447 * can describe any kind of OOB layout with almost zero overhead from a
448 * memory usage point of view).
449 */
shrink_ecclayout(struct mtd_info * mtd,struct nand_ecclayout_user * to)450 static int shrink_ecclayout(struct mtd_info *mtd,
451 struct nand_ecclayout_user *to)
452 {
453 struct mtd_oob_region oobregion;
454 int i, section = 0, ret;
455
456 if (!mtd || !to)
457 return -EINVAL;
458
459 memset(to, 0, sizeof(*to));
460
461 to->eccbytes = 0;
462 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
463 u32 eccpos;
464
465 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
466 if (ret < 0) {
467 if (ret != -ERANGE)
468 return ret;
469
470 break;
471 }
472
473 eccpos = oobregion.offset;
474 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
475 eccpos < oobregion.offset + oobregion.length; i++) {
476 to->eccpos[i] = eccpos++;
477 to->eccbytes++;
478 }
479 }
480
481 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
482 ret = mtd_ooblayout_free(mtd, i, &oobregion);
483 if (ret < 0) {
484 if (ret != -ERANGE)
485 return ret;
486
487 break;
488 }
489
490 to->oobfree[i].offset = oobregion.offset;
491 to->oobfree[i].length = oobregion.length;
492 to->oobavail += to->oobfree[i].length;
493 }
494
495 return 0;
496 }
497
get_oobinfo(struct mtd_info * mtd,struct nand_oobinfo * to)498 static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
499 {
500 struct mtd_oob_region oobregion;
501 int i, section = 0, ret;
502
503 if (!mtd || !to)
504 return -EINVAL;
505
506 memset(to, 0, sizeof(*to));
507
508 to->eccbytes = 0;
509 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
510 u32 eccpos;
511
512 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
513 if (ret < 0) {
514 if (ret != -ERANGE)
515 return ret;
516
517 break;
518 }
519
520 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
521 return -EINVAL;
522
523 eccpos = oobregion.offset;
524 for (; eccpos < oobregion.offset + oobregion.length; i++) {
525 to->eccpos[i] = eccpos++;
526 to->eccbytes++;
527 }
528 }
529
530 for (i = 0; i < 8; i++) {
531 ret = mtd_ooblayout_free(mtd, i, &oobregion);
532 if (ret < 0) {
533 if (ret != -ERANGE)
534 return ret;
535
536 break;
537 }
538
539 to->oobfree[i][0] = oobregion.offset;
540 to->oobfree[i][1] = oobregion.length;
541 }
542
543 to->useecc = MTD_NANDECC_AUTOPLACE;
544
545 return 0;
546 }
547
mtdchar_blkpg_ioctl(struct mtd_info * mtd,struct blkpg_ioctl_arg * arg)548 static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
549 struct blkpg_ioctl_arg *arg)
550 {
551 struct blkpg_partition p;
552
553 if (!capable(CAP_SYS_ADMIN))
554 return -EPERM;
555
556 if (copy_from_user(&p, arg->data, sizeof(p)))
557 return -EFAULT;
558
559 switch (arg->op) {
560 case BLKPG_ADD_PARTITION:
561
562 /* Only master mtd device must be used to add partitions */
563 if (mtd_is_partition(mtd))
564 return -EINVAL;
565
566 /* Sanitize user input */
567 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
568
569 return mtd_add_partition(mtd, p.devname, p.start, p.length);
570
571 case BLKPG_DEL_PARTITION:
572
573 if (p.pno < 0)
574 return -EINVAL;
575
576 return mtd_del_partition(mtd, p.pno);
577
578 default:
579 return -EINVAL;
580 }
581 }
582
mtdchar_write_ioctl(struct mtd_info * mtd,struct mtd_write_req __user * argp)583 static int mtdchar_write_ioctl(struct mtd_info *mtd,
584 struct mtd_write_req __user *argp)
585 {
586 struct mtd_write_req req;
587 struct mtd_oob_ops ops;
588 const void __user *usr_data, *usr_oob;
589 int ret;
590
591 if (copy_from_user(&req, argp, sizeof(req)))
592 return -EFAULT;
593
594 usr_data = (const void __user *)(uintptr_t)req.usr_data;
595 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
596
597 if (!mtd->_write_oob)
598 return -EOPNOTSUPP;
599
600 ops.mode = req.mode;
601 ops.len = (size_t)req.len;
602 ops.ooblen = (size_t)req.ooblen;
603 ops.ooboffs = 0;
604
605 if (usr_data) {
606 ops.datbuf = memdup_user(usr_data, ops.len);
607 if (IS_ERR(ops.datbuf))
608 return PTR_ERR(ops.datbuf);
609 } else {
610 ops.datbuf = NULL;
611 }
612
613 if (usr_oob) {
614 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
615 if (IS_ERR(ops.oobbuf)) {
616 kfree(ops.datbuf);
617 return PTR_ERR(ops.oobbuf);
618 }
619 } else {
620 ops.oobbuf = NULL;
621 }
622
623 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
624
625 kfree(ops.datbuf);
626 kfree(ops.oobbuf);
627
628 return ret;
629 }
630
mtdchar_ioctl(struct file * file,u_int cmd,u_long arg)631 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
632 {
633 struct mtd_file_info *mfi = file->private_data;
634 struct mtd_info *mtd = mfi->mtd;
635 void __user *argp = (void __user *)arg;
636 int ret = 0;
637 struct mtd_info_user info;
638
639 pr_debug("MTD_ioctl\n");
640
641 /*
642 * Check the file mode to require "dangerous" commands to have write
643 * permissions.
644 */
645 switch (cmd) {
646 /* "safe" commands */
647 case MEMGETREGIONCOUNT:
648 case MEMGETREGIONINFO:
649 case MEMGETINFO:
650 case MEMREADOOB:
651 case MEMREADOOB64:
652 case MEMISLOCKED:
653 case MEMGETOOBSEL:
654 case MEMGETBADBLOCK:
655 case OTPSELECT:
656 case OTPGETREGIONCOUNT:
657 case OTPGETREGIONINFO:
658 case ECCGETLAYOUT:
659 case ECCGETSTATS:
660 case MTDFILEMODE:
661 case BLKPG:
662 case BLKRRPART:
663 break;
664
665 /* "dangerous" commands */
666 case MEMERASE:
667 case MEMERASE64:
668 case MEMLOCK:
669 case MEMUNLOCK:
670 case MEMSETBADBLOCK:
671 case MEMWRITEOOB:
672 case MEMWRITEOOB64:
673 case MEMWRITE:
674 case OTPLOCK:
675 if (!(file->f_mode & FMODE_WRITE))
676 return -EPERM;
677 break;
678
679 default:
680 return -ENOTTY;
681 }
682
683 switch (cmd) {
684 case MEMGETREGIONCOUNT:
685 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
686 return -EFAULT;
687 break;
688
689 case MEMGETREGIONINFO:
690 {
691 uint32_t ur_idx;
692 struct mtd_erase_region_info *kr;
693 struct region_info_user __user *ur = argp;
694
695 if (get_user(ur_idx, &(ur->regionindex)))
696 return -EFAULT;
697
698 if (ur_idx >= mtd->numeraseregions)
699 return -EINVAL;
700
701 kr = &(mtd->eraseregions[ur_idx]);
702
703 if (put_user(kr->offset, &(ur->offset))
704 || put_user(kr->erasesize, &(ur->erasesize))
705 || put_user(kr->numblocks, &(ur->numblocks)))
706 return -EFAULT;
707
708 break;
709 }
710
711 case MEMGETINFO:
712 memset(&info, 0, sizeof(info));
713 info.type = mtd->type;
714 info.flags = mtd->flags;
715 info.size = mtd->size;
716 info.erasesize = mtd->erasesize;
717 info.writesize = mtd->writesize;
718 info.oobsize = mtd->oobsize;
719 /* The below field is obsolete */
720 info.padding = 0;
721 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
722 return -EFAULT;
723 break;
724
725 case MEMERASE:
726 case MEMERASE64:
727 {
728 struct erase_info *erase;
729
730 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
731 if (!erase)
732 ret = -ENOMEM;
733 else {
734 if (cmd == MEMERASE64) {
735 struct erase_info_user64 einfo64;
736
737 if (copy_from_user(&einfo64, argp,
738 sizeof(struct erase_info_user64))) {
739 kfree(erase);
740 return -EFAULT;
741 }
742 erase->addr = einfo64.start;
743 erase->len = einfo64.length;
744 } else {
745 struct erase_info_user einfo32;
746
747 if (copy_from_user(&einfo32, argp,
748 sizeof(struct erase_info_user))) {
749 kfree(erase);
750 return -EFAULT;
751 }
752 erase->addr = einfo32.start;
753 erase->len = einfo32.length;
754 }
755
756 ret = mtd_erase(mtd, erase);
757 kfree(erase);
758 }
759 break;
760 }
761
762 case MEMWRITEOOB:
763 {
764 struct mtd_oob_buf buf;
765 struct mtd_oob_buf __user *buf_user = argp;
766
767 /* NOTE: writes return length to buf_user->length */
768 if (copy_from_user(&buf, argp, sizeof(buf)))
769 ret = -EFAULT;
770 else
771 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
772 buf.ptr, &buf_user->length);
773 break;
774 }
775
776 case MEMREADOOB:
777 {
778 struct mtd_oob_buf buf;
779 struct mtd_oob_buf __user *buf_user = argp;
780
781 /* NOTE: writes return length to buf_user->start */
782 if (copy_from_user(&buf, argp, sizeof(buf)))
783 ret = -EFAULT;
784 else
785 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
786 buf.ptr, &buf_user->start);
787 break;
788 }
789
790 case MEMWRITEOOB64:
791 {
792 struct mtd_oob_buf64 buf;
793 struct mtd_oob_buf64 __user *buf_user = argp;
794
795 if (copy_from_user(&buf, argp, sizeof(buf)))
796 ret = -EFAULT;
797 else
798 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
799 (void __user *)(uintptr_t)buf.usr_ptr,
800 &buf_user->length);
801 break;
802 }
803
804 case MEMREADOOB64:
805 {
806 struct mtd_oob_buf64 buf;
807 struct mtd_oob_buf64 __user *buf_user = argp;
808
809 if (copy_from_user(&buf, argp, sizeof(buf)))
810 ret = -EFAULT;
811 else
812 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
813 (void __user *)(uintptr_t)buf.usr_ptr,
814 &buf_user->length);
815 break;
816 }
817
818 case MEMWRITE:
819 {
820 ret = mtdchar_write_ioctl(mtd,
821 (struct mtd_write_req __user *)arg);
822 break;
823 }
824
825 case MEMLOCK:
826 {
827 struct erase_info_user einfo;
828
829 if (copy_from_user(&einfo, argp, sizeof(einfo)))
830 return -EFAULT;
831
832 ret = mtd_lock(mtd, einfo.start, einfo.length);
833 break;
834 }
835
836 case MEMUNLOCK:
837 {
838 struct erase_info_user einfo;
839
840 if (copy_from_user(&einfo, argp, sizeof(einfo)))
841 return -EFAULT;
842
843 ret = mtd_unlock(mtd, einfo.start, einfo.length);
844 break;
845 }
846
847 case MEMISLOCKED:
848 {
849 struct erase_info_user einfo;
850
851 if (copy_from_user(&einfo, argp, sizeof(einfo)))
852 return -EFAULT;
853
854 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
855 break;
856 }
857
858 /* Legacy interface */
859 case MEMGETOOBSEL:
860 {
861 struct nand_oobinfo oi;
862
863 if (!mtd->ooblayout)
864 return -EOPNOTSUPP;
865
866 ret = get_oobinfo(mtd, &oi);
867 if (ret)
868 return ret;
869
870 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
871 return -EFAULT;
872 break;
873 }
874
875 case MEMGETBADBLOCK:
876 {
877 loff_t offs;
878
879 if (copy_from_user(&offs, argp, sizeof(loff_t)))
880 return -EFAULT;
881 return mtd_block_isbad(mtd, offs);
882 break;
883 }
884
885 case MEMSETBADBLOCK:
886 {
887 loff_t offs;
888
889 if (copy_from_user(&offs, argp, sizeof(loff_t)))
890 return -EFAULT;
891 return mtd_block_markbad(mtd, offs);
892 break;
893 }
894
895 case OTPSELECT:
896 {
897 int mode;
898 if (copy_from_user(&mode, argp, sizeof(int)))
899 return -EFAULT;
900
901 mfi->mode = MTD_FILE_MODE_NORMAL;
902
903 ret = otp_select_filemode(mfi, mode);
904
905 file->f_pos = 0;
906 break;
907 }
908
909 case OTPGETREGIONCOUNT:
910 case OTPGETREGIONINFO:
911 {
912 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
913 size_t retlen;
914 if (!buf)
915 return -ENOMEM;
916 switch (mfi->mode) {
917 case MTD_FILE_MODE_OTP_FACTORY:
918 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
919 break;
920 case MTD_FILE_MODE_OTP_USER:
921 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
922 break;
923 default:
924 ret = -EINVAL;
925 break;
926 }
927 if (!ret) {
928 if (cmd == OTPGETREGIONCOUNT) {
929 int nbr = retlen / sizeof(struct otp_info);
930 ret = copy_to_user(argp, &nbr, sizeof(int));
931 } else
932 ret = copy_to_user(argp, buf, retlen);
933 if (ret)
934 ret = -EFAULT;
935 }
936 kfree(buf);
937 break;
938 }
939
940 case OTPLOCK:
941 {
942 struct otp_info oinfo;
943
944 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
945 return -EINVAL;
946 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
947 return -EFAULT;
948 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
949 break;
950 }
951
952 /* This ioctl is being deprecated - it truncates the ECC layout */
953 case ECCGETLAYOUT:
954 {
955 struct nand_ecclayout_user *usrlay;
956
957 if (!mtd->ooblayout)
958 return -EOPNOTSUPP;
959
960 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
961 if (!usrlay)
962 return -ENOMEM;
963
964 shrink_ecclayout(mtd, usrlay);
965
966 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
967 ret = -EFAULT;
968 kfree(usrlay);
969 break;
970 }
971
972 case ECCGETSTATS:
973 {
974 if (copy_to_user(argp, &mtd->ecc_stats,
975 sizeof(struct mtd_ecc_stats)))
976 return -EFAULT;
977 break;
978 }
979
980 case MTDFILEMODE:
981 {
982 mfi->mode = 0;
983
984 switch(arg) {
985 case MTD_FILE_MODE_OTP_FACTORY:
986 case MTD_FILE_MODE_OTP_USER:
987 ret = otp_select_filemode(mfi, arg);
988 break;
989
990 case MTD_FILE_MODE_RAW:
991 if (!mtd_has_oob(mtd))
992 return -EOPNOTSUPP;
993 mfi->mode = arg;
994
995 case MTD_FILE_MODE_NORMAL:
996 break;
997 default:
998 ret = -EINVAL;
999 }
1000 file->f_pos = 0;
1001 break;
1002 }
1003
1004 case BLKPG:
1005 {
1006 struct blkpg_ioctl_arg __user *blk_arg = argp;
1007 struct blkpg_ioctl_arg a;
1008
1009 if (copy_from_user(&a, blk_arg, sizeof(a)))
1010 ret = -EFAULT;
1011 else
1012 ret = mtdchar_blkpg_ioctl(mtd, &a);
1013 break;
1014 }
1015
1016 case BLKRRPART:
1017 {
1018 /* No reread partition feature. Just return ok */
1019 ret = 0;
1020 break;
1021 }
1022 }
1023
1024 return ret;
1025 } /* memory_ioctl */
1026
mtdchar_unlocked_ioctl(struct file * file,u_int cmd,u_long arg)1027 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1028 {
1029 int ret;
1030
1031 mutex_lock(&mtd_mutex);
1032 ret = mtdchar_ioctl(file, cmd, arg);
1033 mutex_unlock(&mtd_mutex);
1034
1035 return ret;
1036 }
1037
1038 #ifdef CONFIG_COMPAT
1039
1040 struct mtd_oob_buf32 {
1041 u_int32_t start;
1042 u_int32_t length;
1043 compat_caddr_t ptr; /* unsigned char* */
1044 };
1045
1046 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1047 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1048
mtdchar_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1049 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1050 unsigned long arg)
1051 {
1052 struct mtd_file_info *mfi = file->private_data;
1053 struct mtd_info *mtd = mfi->mtd;
1054 void __user *argp = compat_ptr(arg);
1055 int ret = 0;
1056
1057 mutex_lock(&mtd_mutex);
1058
1059 switch (cmd) {
1060 case MEMWRITEOOB32:
1061 {
1062 struct mtd_oob_buf32 buf;
1063 struct mtd_oob_buf32 __user *buf_user = argp;
1064
1065 if (!(file->f_mode & FMODE_WRITE)) {
1066 ret = -EPERM;
1067 break;
1068 }
1069
1070 if (copy_from_user(&buf, argp, sizeof(buf)))
1071 ret = -EFAULT;
1072 else
1073 ret = mtdchar_writeoob(file, mtd, buf.start,
1074 buf.length, compat_ptr(buf.ptr),
1075 &buf_user->length);
1076 break;
1077 }
1078
1079 case MEMREADOOB32:
1080 {
1081 struct mtd_oob_buf32 buf;
1082 struct mtd_oob_buf32 __user *buf_user = argp;
1083
1084 /* NOTE: writes return length to buf->start */
1085 if (copy_from_user(&buf, argp, sizeof(buf)))
1086 ret = -EFAULT;
1087 else
1088 ret = mtdchar_readoob(file, mtd, buf.start,
1089 buf.length, compat_ptr(buf.ptr),
1090 &buf_user->start);
1091 break;
1092 }
1093
1094 case BLKPG:
1095 {
1096 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1097 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1098 struct blkpg_compat_ioctl_arg compat_arg;
1099 struct blkpg_ioctl_arg a;
1100
1101 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1102 ret = -EFAULT;
1103 break;
1104 }
1105
1106 memset(&a, 0, sizeof(a));
1107 a.op = compat_arg.op;
1108 a.flags = compat_arg.flags;
1109 a.datalen = compat_arg.datalen;
1110 a.data = compat_ptr(compat_arg.data);
1111
1112 ret = mtdchar_blkpg_ioctl(mtd, &a);
1113 break;
1114 }
1115
1116 default:
1117 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1118 }
1119
1120 mutex_unlock(&mtd_mutex);
1121
1122 return ret;
1123 }
1124
1125 #endif /* CONFIG_COMPAT */
1126
1127 /*
1128 * try to determine where a shared mapping can be made
1129 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1130 * mappings)
1131 */
1132 #ifndef CONFIG_MMU
mtdchar_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)1133 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1134 unsigned long addr,
1135 unsigned long len,
1136 unsigned long pgoff,
1137 unsigned long flags)
1138 {
1139 struct mtd_file_info *mfi = file->private_data;
1140 struct mtd_info *mtd = mfi->mtd;
1141 unsigned long offset;
1142 int ret;
1143
1144 if (addr != 0)
1145 return (unsigned long) -EINVAL;
1146
1147 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1148 return (unsigned long) -EINVAL;
1149
1150 offset = pgoff << PAGE_SHIFT;
1151 if (offset > mtd->size - len)
1152 return (unsigned long) -EINVAL;
1153
1154 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1155 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1156 }
1157
mtdchar_mmap_capabilities(struct file * file)1158 static unsigned mtdchar_mmap_capabilities(struct file *file)
1159 {
1160 struct mtd_file_info *mfi = file->private_data;
1161
1162 return mtd_mmap_capabilities(mfi->mtd);
1163 }
1164 #endif
1165
1166 /*
1167 * set up a mapping for shared memory segments
1168 */
mtdchar_mmap(struct file * file,struct vm_area_struct * vma)1169 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1170 {
1171 #ifdef CONFIG_MMU
1172 struct mtd_file_info *mfi = file->private_data;
1173 struct mtd_info *mtd = mfi->mtd;
1174 struct map_info *map = mtd->priv;
1175
1176 /* This is broken because it assumes the MTD device is map-based
1177 and that mtd->priv is a valid struct map_info. It should be
1178 replaced with something that uses the mtd_get_unmapped_area()
1179 operation properly. */
1180 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1181 #ifdef pgprot_noncached
1182 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1183 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1184 #endif
1185 return vm_iomap_memory(vma, map->phys, map->size);
1186 }
1187 return -ENODEV;
1188 #else
1189 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1190 #endif
1191 }
1192
1193 static const struct file_operations mtd_fops = {
1194 .owner = THIS_MODULE,
1195 .llseek = mtdchar_lseek,
1196 .read = mtdchar_read,
1197 .write = mtdchar_write,
1198 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1199 #ifdef CONFIG_COMPAT
1200 .compat_ioctl = mtdchar_compat_ioctl,
1201 #endif
1202 .open = mtdchar_open,
1203 .release = mtdchar_close,
1204 .mmap = mtdchar_mmap,
1205 #ifndef CONFIG_MMU
1206 .get_unmapped_area = mtdchar_get_unmapped_area,
1207 .mmap_capabilities = mtdchar_mmap_capabilities,
1208 #endif
1209 };
1210
init_mtdchar(void)1211 int __init init_mtdchar(void)
1212 {
1213 int ret;
1214
1215 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1216 "mtd", &mtd_fops);
1217 if (ret < 0) {
1218 pr_err("Can't allocate major number %d for MTD\n",
1219 MTD_CHAR_MAJOR);
1220 return ret;
1221 }
1222
1223 return ret;
1224 }
1225
cleanup_mtdchar(void)1226 void __exit cleanup_mtdchar(void)
1227 {
1228 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1229 }
1230
1231 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1232