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 */
34 struct mtd_file_info {
35 struct mtd_info *mtd;
36 enum mtd_file_modes mode;
37 };
38
mtdchar_lseek(struct file * file,loff_t offset,int orig)39 static 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
mtdchar_open(struct inode * inode,struct file * file)45 static 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
84 out1:
85 put_mtd_device(mtd);
86 return ret;
87 } /* mtdchar_open */
88
89 /*====================================================================*/
90
mtdchar_close(struct inode * inode,struct file * file)91 static 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
mtdchar_read(struct file * file,char __user * buf,size_t count,loff_t * ppos)127 static 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
mtdchar_write(struct file * file,const char __user * buf,size_t count,loff_t * ppos)217 static 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
otp_select_filemode(struct mtd_file_info * mfi,int mode)310 static 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
mtdchar_writeoob(struct file * file,struct mtd_info * mtd,uint64_t start,uint32_t length,void __user * ptr,uint32_t __user * retp)340 static 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
mtdchar_readoob(struct file * file,struct mtd_info * mtd,uint64_t start,uint32_t length,void __user * ptr,uint32_t __user * retp)382 static 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 */
shrink_ecclayout(struct mtd_info * mtd,struct nand_ecclayout_user * to)443 static 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
get_oobinfo(struct mtd_info * mtd,struct nand_oobinfo * to)491 static 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
mtdchar_blkpg_ioctl(struct mtd_info * mtd,struct blkpg_ioctl_arg * arg)541 static 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
mtdchar_write_ioctl(struct mtd_info * mtd,struct mtd_write_req __user * argp)576 static int mtdchar_write_ioctl(struct mtd_info *mtd,
577 struct mtd_write_req __user *argp)
578 {
579 struct mtd_info *master = mtd_get_master(mtd);
580 struct mtd_write_req req;
581 struct mtd_oob_ops ops = {};
582 const void __user *usr_data, *usr_oob;
583 int ret;
584
585 if (copy_from_user(&req, argp, sizeof(req)))
586 return -EFAULT;
587
588 usr_data = (const void __user *)(uintptr_t)req.usr_data;
589 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
590
591 if (!master->_write_oob)
592 return -EOPNOTSUPP;
593 ops.mode = req.mode;
594 ops.len = (size_t)req.len;
595 ops.ooblen = (size_t)req.ooblen;
596 ops.ooboffs = 0;
597
598 if (usr_data) {
599 ops.datbuf = memdup_user(usr_data, ops.len);
600 if (IS_ERR(ops.datbuf))
601 return PTR_ERR(ops.datbuf);
602 } else {
603 ops.datbuf = NULL;
604 }
605
606 if (usr_oob) {
607 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
608 if (IS_ERR(ops.oobbuf)) {
609 kfree(ops.datbuf);
610 return PTR_ERR(ops.oobbuf);
611 }
612 } else {
613 ops.oobbuf = NULL;
614 }
615
616 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
617
618 kfree(ops.datbuf);
619 kfree(ops.oobbuf);
620
621 return ret;
622 }
623
mtdchar_ioctl(struct file * file,u_int cmd,u_long arg)624 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
625 {
626 struct mtd_file_info *mfi = file->private_data;
627 struct mtd_info *mtd = mfi->mtd;
628 struct mtd_info *master = mtd_get_master(mtd);
629 void __user *argp = (void __user *)arg;
630 int ret = 0;
631 struct mtd_info_user info;
632
633 pr_debug("MTD_ioctl\n");
634
635 /*
636 * Check the file mode to require "dangerous" commands to have write
637 * permissions.
638 */
639 switch (cmd) {
640 /* "safe" commands */
641 case MEMGETREGIONCOUNT:
642 case MEMGETREGIONINFO:
643 case MEMGETINFO:
644 case MEMREADOOB:
645 case MEMREADOOB64:
646 case MEMISLOCKED:
647 case MEMGETOOBSEL:
648 case MEMGETBADBLOCK:
649 case OTPSELECT:
650 case OTPGETREGIONCOUNT:
651 case OTPGETREGIONINFO:
652 case ECCGETLAYOUT:
653 case ECCGETSTATS:
654 case MTDFILEMODE:
655 case BLKPG:
656 case BLKRRPART:
657 break;
658
659 /* "dangerous" commands */
660 case MEMERASE:
661 case MEMERASE64:
662 case MEMLOCK:
663 case MEMUNLOCK:
664 case MEMSETBADBLOCK:
665 case MEMWRITEOOB:
666 case MEMWRITEOOB64:
667 case MEMWRITE:
668 case OTPLOCK:
669 case OTPERASE:
670 if (!(file->f_mode & FMODE_WRITE))
671 return -EPERM;
672 break;
673
674 default:
675 return -ENOTTY;
676 }
677
678 switch (cmd) {
679 case MEMGETREGIONCOUNT:
680 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
681 return -EFAULT;
682 break;
683
684 case MEMGETREGIONINFO:
685 {
686 uint32_t ur_idx;
687 struct mtd_erase_region_info *kr;
688 struct region_info_user __user *ur = argp;
689
690 if (get_user(ur_idx, &(ur->regionindex)))
691 return -EFAULT;
692
693 if (ur_idx >= mtd->numeraseregions)
694 return -EINVAL;
695
696 kr = &(mtd->eraseregions[ur_idx]);
697
698 if (put_user(kr->offset, &(ur->offset))
699 || put_user(kr->erasesize, &(ur->erasesize))
700 || put_user(kr->numblocks, &(ur->numblocks)))
701 return -EFAULT;
702
703 break;
704 }
705
706 case MEMGETINFO:
707 memset(&info, 0, sizeof(info));
708 info.type = mtd->type;
709 info.flags = mtd->flags;
710 info.size = mtd->size;
711 info.erasesize = mtd->erasesize;
712 info.writesize = mtd->writesize;
713 info.oobsize = mtd->oobsize;
714 /* The below field is obsolete */
715 info.padding = 0;
716 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
717 return -EFAULT;
718 break;
719
720 case MEMERASE:
721 case MEMERASE64:
722 {
723 struct erase_info *erase;
724
725 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
726 if (!erase)
727 ret = -ENOMEM;
728 else {
729 if (cmd == MEMERASE64) {
730 struct erase_info_user64 einfo64;
731
732 if (copy_from_user(&einfo64, argp,
733 sizeof(struct erase_info_user64))) {
734 kfree(erase);
735 return -EFAULT;
736 }
737 erase->addr = einfo64.start;
738 erase->len = einfo64.length;
739 } else {
740 struct erase_info_user einfo32;
741
742 if (copy_from_user(&einfo32, argp,
743 sizeof(struct erase_info_user))) {
744 kfree(erase);
745 return -EFAULT;
746 }
747 erase->addr = einfo32.start;
748 erase->len = einfo32.length;
749 }
750
751 ret = mtd_erase(mtd, erase);
752 kfree(erase);
753 }
754 break;
755 }
756
757 case MEMWRITEOOB:
758 {
759 struct mtd_oob_buf buf;
760 struct mtd_oob_buf __user *buf_user = argp;
761
762 /* NOTE: writes return length to buf_user->length */
763 if (copy_from_user(&buf, argp, sizeof(buf)))
764 ret = -EFAULT;
765 else
766 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
767 buf.ptr, &buf_user->length);
768 break;
769 }
770
771 case MEMREADOOB:
772 {
773 struct mtd_oob_buf buf;
774 struct mtd_oob_buf __user *buf_user = argp;
775
776 /* NOTE: writes return length to buf_user->start */
777 if (copy_from_user(&buf, argp, sizeof(buf)))
778 ret = -EFAULT;
779 else
780 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
781 buf.ptr, &buf_user->start);
782 break;
783 }
784
785 case MEMWRITEOOB64:
786 {
787 struct mtd_oob_buf64 buf;
788 struct mtd_oob_buf64 __user *buf_user = argp;
789
790 if (copy_from_user(&buf, argp, sizeof(buf)))
791 ret = -EFAULT;
792 else
793 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
794 (void __user *)(uintptr_t)buf.usr_ptr,
795 &buf_user->length);
796 break;
797 }
798
799 case MEMREADOOB64:
800 {
801 struct mtd_oob_buf64 buf;
802 struct mtd_oob_buf64 __user *buf_user = argp;
803
804 if (copy_from_user(&buf, argp, sizeof(buf)))
805 ret = -EFAULT;
806 else
807 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
808 (void __user *)(uintptr_t)buf.usr_ptr,
809 &buf_user->length);
810 break;
811 }
812
813 case MEMWRITE:
814 {
815 ret = mtdchar_write_ioctl(mtd,
816 (struct mtd_write_req __user *)arg);
817 break;
818 }
819
820 case MEMLOCK:
821 {
822 struct erase_info_user einfo;
823
824 if (copy_from_user(&einfo, argp, sizeof(einfo)))
825 return -EFAULT;
826
827 ret = mtd_lock(mtd, einfo.start, einfo.length);
828 break;
829 }
830
831 case MEMUNLOCK:
832 {
833 struct erase_info_user einfo;
834
835 if (copy_from_user(&einfo, argp, sizeof(einfo)))
836 return -EFAULT;
837
838 ret = mtd_unlock(mtd, einfo.start, einfo.length);
839 break;
840 }
841
842 case MEMISLOCKED:
843 {
844 struct erase_info_user einfo;
845
846 if (copy_from_user(&einfo, argp, sizeof(einfo)))
847 return -EFAULT;
848
849 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
850 break;
851 }
852
853 /* Legacy interface */
854 case MEMGETOOBSEL:
855 {
856 struct nand_oobinfo oi;
857
858 if (!master->ooblayout)
859 return -EOPNOTSUPP;
860
861 ret = get_oobinfo(mtd, &oi);
862 if (ret)
863 return ret;
864
865 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
866 return -EFAULT;
867 break;
868 }
869
870 case MEMGETBADBLOCK:
871 {
872 loff_t offs;
873
874 if (copy_from_user(&offs, argp, sizeof(loff_t)))
875 return -EFAULT;
876 return mtd_block_isbad(mtd, offs);
877 }
878
879 case MEMSETBADBLOCK:
880 {
881 loff_t offs;
882
883 if (copy_from_user(&offs, argp, sizeof(loff_t)))
884 return -EFAULT;
885 return mtd_block_markbad(mtd, offs);
886 }
887
888 case OTPSELECT:
889 {
890 int mode;
891 if (copy_from_user(&mode, argp, sizeof(int)))
892 return -EFAULT;
893
894 mfi->mode = MTD_FILE_MODE_NORMAL;
895
896 ret = otp_select_filemode(mfi, mode);
897
898 file->f_pos = 0;
899 break;
900 }
901
902 case OTPGETREGIONCOUNT:
903 case OTPGETREGIONINFO:
904 {
905 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
906 size_t retlen;
907 if (!buf)
908 return -ENOMEM;
909 switch (mfi->mode) {
910 case MTD_FILE_MODE_OTP_FACTORY:
911 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
912 break;
913 case MTD_FILE_MODE_OTP_USER:
914 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
915 break;
916 default:
917 ret = -EINVAL;
918 break;
919 }
920 if (!ret) {
921 if (cmd == OTPGETREGIONCOUNT) {
922 int nbr = retlen / sizeof(struct otp_info);
923 ret = copy_to_user(argp, &nbr, sizeof(int));
924 } else
925 ret = copy_to_user(argp, buf, retlen);
926 if (ret)
927 ret = -EFAULT;
928 }
929 kfree(buf);
930 break;
931 }
932
933 case OTPLOCK:
934 case OTPERASE:
935 {
936 struct otp_info oinfo;
937
938 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
939 return -EINVAL;
940 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
941 return -EFAULT;
942 if (cmd == OTPLOCK)
943 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
944 else
945 ret = mtd_erase_user_prot_reg(mtd, oinfo.start, oinfo.length);
946 break;
947 }
948
949 /* This ioctl is being deprecated - it truncates the ECC layout */
950 case ECCGETLAYOUT:
951 {
952 struct nand_ecclayout_user *usrlay;
953
954 if (!master->ooblayout)
955 return -EOPNOTSUPP;
956
957 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
958 if (!usrlay)
959 return -ENOMEM;
960
961 shrink_ecclayout(mtd, usrlay);
962
963 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
964 ret = -EFAULT;
965 kfree(usrlay);
966 break;
967 }
968
969 case ECCGETSTATS:
970 {
971 if (copy_to_user(argp, &mtd->ecc_stats,
972 sizeof(struct mtd_ecc_stats)))
973 return -EFAULT;
974 break;
975 }
976
977 case MTDFILEMODE:
978 {
979 mfi->mode = 0;
980
981 switch(arg) {
982 case MTD_FILE_MODE_OTP_FACTORY:
983 case MTD_FILE_MODE_OTP_USER:
984 ret = otp_select_filemode(mfi, arg);
985 break;
986
987 case MTD_FILE_MODE_RAW:
988 if (!mtd_has_oob(mtd))
989 return -EOPNOTSUPP;
990 mfi->mode = arg;
991 break;
992
993 case MTD_FILE_MODE_NORMAL:
994 break;
995 default:
996 ret = -EINVAL;
997 }
998 file->f_pos = 0;
999 break;
1000 }
1001
1002 case BLKPG:
1003 {
1004 struct blkpg_ioctl_arg __user *blk_arg = argp;
1005 struct blkpg_ioctl_arg a;
1006
1007 if (copy_from_user(&a, blk_arg, sizeof(a)))
1008 ret = -EFAULT;
1009 else
1010 ret = mtdchar_blkpg_ioctl(mtd, &a);
1011 break;
1012 }
1013
1014 case BLKRRPART:
1015 {
1016 /* No reread partition feature. Just return ok */
1017 ret = 0;
1018 break;
1019 }
1020 }
1021
1022 return ret;
1023 } /* memory_ioctl */
1024
mtdchar_unlocked_ioctl(struct file * file,u_int cmd,u_long arg)1025 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1026 {
1027 struct mtd_file_info *mfi = file->private_data;
1028 struct mtd_info *mtd = mfi->mtd;
1029 struct mtd_info *master = mtd_get_master(mtd);
1030 int ret;
1031
1032 mutex_lock(&master->master.chrdev_lock);
1033 ret = mtdchar_ioctl(file, cmd, arg);
1034 mutex_unlock(&master->master.chrdev_lock);
1035
1036 return ret;
1037 }
1038
1039 #ifdef CONFIG_COMPAT
1040
1041 struct mtd_oob_buf32 {
1042 u_int32_t start;
1043 u_int32_t length;
1044 compat_caddr_t ptr; /* unsigned char* */
1045 };
1046
1047 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1048 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1049
mtdchar_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1050 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1051 unsigned long arg)
1052 {
1053 struct mtd_file_info *mfi = file->private_data;
1054 struct mtd_info *mtd = mfi->mtd;
1055 struct mtd_info *master = mtd_get_master(mtd);
1056 void __user *argp = compat_ptr(arg);
1057 int ret = 0;
1058
1059 mutex_lock(&master->master.chrdev_lock);
1060
1061 switch (cmd) {
1062 case MEMWRITEOOB32:
1063 {
1064 struct mtd_oob_buf32 buf;
1065 struct mtd_oob_buf32 __user *buf_user = argp;
1066
1067 if (!(file->f_mode & FMODE_WRITE)) {
1068 ret = -EPERM;
1069 break;
1070 }
1071
1072 if (copy_from_user(&buf, argp, sizeof(buf)))
1073 ret = -EFAULT;
1074 else
1075 ret = mtdchar_writeoob(file, mtd, buf.start,
1076 buf.length, compat_ptr(buf.ptr),
1077 &buf_user->length);
1078 break;
1079 }
1080
1081 case MEMREADOOB32:
1082 {
1083 struct mtd_oob_buf32 buf;
1084 struct mtd_oob_buf32 __user *buf_user = argp;
1085
1086 /* NOTE: writes return length to buf->start */
1087 if (copy_from_user(&buf, argp, sizeof(buf)))
1088 ret = -EFAULT;
1089 else
1090 ret = mtdchar_readoob(file, mtd, buf.start,
1091 buf.length, compat_ptr(buf.ptr),
1092 &buf_user->start);
1093 break;
1094 }
1095
1096 case BLKPG:
1097 {
1098 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1099 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1100 struct blkpg_compat_ioctl_arg compat_arg;
1101 struct blkpg_ioctl_arg a;
1102
1103 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1104 ret = -EFAULT;
1105 break;
1106 }
1107
1108 memset(&a, 0, sizeof(a));
1109 a.op = compat_arg.op;
1110 a.flags = compat_arg.flags;
1111 a.datalen = compat_arg.datalen;
1112 a.data = compat_ptr(compat_arg.data);
1113
1114 ret = mtdchar_blkpg_ioctl(mtd, &a);
1115 break;
1116 }
1117
1118 default:
1119 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1120 }
1121
1122 mutex_unlock(&master->master.chrdev_lock);
1123
1124 return ret;
1125 }
1126
1127 #endif /* CONFIG_COMPAT */
1128
1129 /*
1130 * try to determine where a shared mapping can be made
1131 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1132 * mappings)
1133 */
1134 #ifndef CONFIG_MMU
mtdchar_get_unmapped_area(struct file * file,unsigned long addr,unsigned long len,unsigned long pgoff,unsigned long flags)1135 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1136 unsigned long addr,
1137 unsigned long len,
1138 unsigned long pgoff,
1139 unsigned long flags)
1140 {
1141 struct mtd_file_info *mfi = file->private_data;
1142 struct mtd_info *mtd = mfi->mtd;
1143 unsigned long offset;
1144 int ret;
1145
1146 if (addr != 0)
1147 return (unsigned long) -EINVAL;
1148
1149 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1150 return (unsigned long) -EINVAL;
1151
1152 offset = pgoff << PAGE_SHIFT;
1153 if (offset > mtd->size - len)
1154 return (unsigned long) -EINVAL;
1155
1156 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1157 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1158 }
1159
mtdchar_mmap_capabilities(struct file * file)1160 static unsigned mtdchar_mmap_capabilities(struct file *file)
1161 {
1162 struct mtd_file_info *mfi = file->private_data;
1163
1164 return mtd_mmap_capabilities(mfi->mtd);
1165 }
1166 #endif
1167
1168 /*
1169 * set up a mapping for shared memory segments
1170 */
mtdchar_mmap(struct file * file,struct vm_area_struct * vma)1171 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1172 {
1173 #ifdef CONFIG_MMU
1174 struct mtd_file_info *mfi = file->private_data;
1175 struct mtd_info *mtd = mfi->mtd;
1176 struct map_info *map = mtd->priv;
1177
1178 /* This is broken because it assumes the MTD device is map-based
1179 and that mtd->priv is a valid struct map_info. It should be
1180 replaced with something that uses the mtd_get_unmapped_area()
1181 operation properly. */
1182 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1183 #ifdef pgprot_noncached
1184 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1185 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1186 #endif
1187 return vm_iomap_memory(vma, map->phys, map->size);
1188 }
1189 return -ENODEV;
1190 #else
1191 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1192 #endif
1193 }
1194
1195 static const struct file_operations mtd_fops = {
1196 .owner = THIS_MODULE,
1197 .llseek = mtdchar_lseek,
1198 .read = mtdchar_read,
1199 .write = mtdchar_write,
1200 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1201 #ifdef CONFIG_COMPAT
1202 .compat_ioctl = mtdchar_compat_ioctl,
1203 #endif
1204 .open = mtdchar_open,
1205 .release = mtdchar_close,
1206 .mmap = mtdchar_mmap,
1207 #ifndef CONFIG_MMU
1208 .get_unmapped_area = mtdchar_get_unmapped_area,
1209 .mmap_capabilities = mtdchar_mmap_capabilities,
1210 #endif
1211 };
1212
init_mtdchar(void)1213 int __init init_mtdchar(void)
1214 {
1215 int ret;
1216
1217 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1218 "mtd", &mtd_fops);
1219 if (ret < 0) {
1220 pr_err("Can't allocate major number %d for MTD\n",
1221 MTD_CHAR_MAJOR);
1222 return ret;
1223 }
1224
1225 return ret;
1226 }
1227
cleanup_mtdchar(void)1228 void __exit cleanup_mtdchar(void)
1229 {
1230 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1231 }
1232
1233 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1234