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mtd: nand: expand nand_ecc_layout, deprecate ioctl ECCGETLAYOUT
[deliverable/linux.git] / drivers / mtd / mtdchar.c
1 /*
2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 */
19
20 #include <linux/device.h>
21 #include <linux/fs.h>
22 #include <linux/mm.h>
23 #include <linux/err.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/sched.h>
29 #include <linux/smp_lock.h>
30 #include <linux/backing-dev.h>
31 #include <linux/compat.h>
32 #include <linux/mount.h>
33
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/map.h>
36
37 #include <asm/uaccess.h>
38
39 #define MTD_INODE_FS_MAGIC 0x11307854
40 static struct vfsmount *mtd_inode_mnt __read_mostly;
41
42 /*
43 * Data structure to hold the pointer to the mtd device as well
44 * as mode information ofr various use cases.
45 */
46 struct mtd_file_info {
47 struct mtd_info *mtd;
48 struct inode *ino;
49 enum mtd_file_modes mode;
50 };
51
52 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
53 {
54 struct mtd_file_info *mfi = file->private_data;
55 struct mtd_info *mtd = mfi->mtd;
56
57 switch (orig) {
58 case SEEK_SET:
59 break;
60 case SEEK_CUR:
61 offset += file->f_pos;
62 break;
63 case SEEK_END:
64 offset += mtd->size;
65 break;
66 default:
67 return -EINVAL;
68 }
69
70 if (offset >= 0 && offset <= mtd->size)
71 return file->f_pos = offset;
72
73 return -EINVAL;
74 }
75
76
77
78 static int mtd_open(struct inode *inode, struct file *file)
79 {
80 int minor = iminor(inode);
81 int devnum = minor >> 1;
82 int ret = 0;
83 struct mtd_info *mtd;
84 struct mtd_file_info *mfi;
85 struct inode *mtd_ino;
86
87 DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
88
89 /* You can't open the RO devices RW */
90 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
91 return -EACCES;
92
93 lock_kernel();
94 mtd = get_mtd_device(NULL, devnum);
95
96 if (IS_ERR(mtd)) {
97 ret = PTR_ERR(mtd);
98 goto out;
99 }
100
101 if (mtd->type == MTD_ABSENT) {
102 put_mtd_device(mtd);
103 ret = -ENODEV;
104 goto out;
105 }
106
107 mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
108 if (!mtd_ino) {
109 put_mtd_device(mtd);
110 ret = -ENOMEM;
111 goto out;
112 }
113 if (mtd_ino->i_state & I_NEW) {
114 mtd_ino->i_private = mtd;
115 mtd_ino->i_mode = S_IFCHR;
116 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
117 unlock_new_inode(mtd_ino);
118 }
119 file->f_mapping = mtd_ino->i_mapping;
120
121 /* You can't open it RW if it's not a writeable device */
122 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
123 iput(mtd_ino);
124 put_mtd_device(mtd);
125 ret = -EACCES;
126 goto out;
127 }
128
129 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
130 if (!mfi) {
131 iput(mtd_ino);
132 put_mtd_device(mtd);
133 ret = -ENOMEM;
134 goto out;
135 }
136 mfi->ino = mtd_ino;
137 mfi->mtd = mtd;
138 file->private_data = mfi;
139
140 out:
141 unlock_kernel();
142 return ret;
143 } /* mtd_open */
144
145 /*====================================================================*/
146
147 static int mtd_close(struct inode *inode, struct file *file)
148 {
149 struct mtd_file_info *mfi = file->private_data;
150 struct mtd_info *mtd = mfi->mtd;
151
152 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
153
154 /* Only sync if opened RW */
155 if ((file->f_mode & FMODE_WRITE) && mtd->sync)
156 mtd->sync(mtd);
157
158 iput(mfi->ino);
159
160 put_mtd_device(mtd);
161 file->private_data = NULL;
162 kfree(mfi);
163
164 return 0;
165 } /* mtd_close */
166
167 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
168 userspace buffer down and use it directly with readv/writev.
169 */
170 #define MAX_KMALLOC_SIZE 0x20000
171
172 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
173 {
174 struct mtd_file_info *mfi = file->private_data;
175 struct mtd_info *mtd = mfi->mtd;
176 size_t retlen=0;
177 size_t total_retlen=0;
178 int ret=0;
179 int len;
180 char *kbuf;
181
182 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
183
184 if (*ppos + count > mtd->size)
185 count = mtd->size - *ppos;
186
187 if (!count)
188 return 0;
189
190 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
191 and pass them directly to the MTD functions */
192
193 if (count > MAX_KMALLOC_SIZE)
194 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
195 else
196 kbuf=kmalloc(count, GFP_KERNEL);
197
198 if (!kbuf)
199 return -ENOMEM;
200
201 while (count) {
202
203 if (count > MAX_KMALLOC_SIZE)
204 len = MAX_KMALLOC_SIZE;
205 else
206 len = count;
207
208 switch (mfi->mode) {
209 case MTD_MODE_OTP_FACTORY:
210 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
211 break;
212 case MTD_MODE_OTP_USER:
213 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
214 break;
215 case MTD_MODE_RAW:
216 {
217 struct mtd_oob_ops ops;
218
219 ops.mode = MTD_OOB_RAW;
220 ops.datbuf = kbuf;
221 ops.oobbuf = NULL;
222 ops.len = len;
223
224 ret = mtd->read_oob(mtd, *ppos, &ops);
225 retlen = ops.retlen;
226 break;
227 }
228 default:
229 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
230 }
231 /* Nand returns -EBADMSG on ecc errors, but it returns
232 * the data. For our userspace tools it is important
233 * to dump areas with ecc errors !
234 * For kernel internal usage it also might return -EUCLEAN
235 * to signal the caller that a bitflip has occured and has
236 * been corrected by the ECC algorithm.
237 * Userspace software which accesses NAND this way
238 * must be aware of the fact that it deals with NAND
239 */
240 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
241 *ppos += retlen;
242 if (copy_to_user(buf, kbuf, retlen)) {
243 kfree(kbuf);
244 return -EFAULT;
245 }
246 else
247 total_retlen += retlen;
248
249 count -= retlen;
250 buf += retlen;
251 if (retlen == 0)
252 count = 0;
253 }
254 else {
255 kfree(kbuf);
256 return ret;
257 }
258
259 }
260
261 kfree(kbuf);
262 return total_retlen;
263 } /* mtd_read */
264
265 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
266 {
267 struct mtd_file_info *mfi = file->private_data;
268 struct mtd_info *mtd = mfi->mtd;
269 char *kbuf;
270 size_t retlen;
271 size_t total_retlen=0;
272 int ret=0;
273 int len;
274
275 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
276
277 if (*ppos == mtd->size)
278 return -ENOSPC;
279
280 if (*ppos + count > mtd->size)
281 count = mtd->size - *ppos;
282
283 if (!count)
284 return 0;
285
286 if (count > MAX_KMALLOC_SIZE)
287 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
288 else
289 kbuf=kmalloc(count, GFP_KERNEL);
290
291 if (!kbuf)
292 return -ENOMEM;
293
294 while (count) {
295
296 if (count > MAX_KMALLOC_SIZE)
297 len = MAX_KMALLOC_SIZE;
298 else
299 len = count;
300
301 if (copy_from_user(kbuf, buf, len)) {
302 kfree(kbuf);
303 return -EFAULT;
304 }
305
306 switch (mfi->mode) {
307 case MTD_MODE_OTP_FACTORY:
308 ret = -EROFS;
309 break;
310 case MTD_MODE_OTP_USER:
311 if (!mtd->write_user_prot_reg) {
312 ret = -EOPNOTSUPP;
313 break;
314 }
315 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
316 break;
317
318 case MTD_MODE_RAW:
319 {
320 struct mtd_oob_ops ops;
321
322 ops.mode = MTD_OOB_RAW;
323 ops.datbuf = kbuf;
324 ops.oobbuf = NULL;
325 ops.len = len;
326
327 ret = mtd->write_oob(mtd, *ppos, &ops);
328 retlen = ops.retlen;
329 break;
330 }
331
332 default:
333 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
334 }
335 if (!ret) {
336 *ppos += retlen;
337 total_retlen += retlen;
338 count -= retlen;
339 buf += retlen;
340 }
341 else {
342 kfree(kbuf);
343 return ret;
344 }
345 }
346
347 kfree(kbuf);
348 return total_retlen;
349 } /* mtd_write */
350
351 /*======================================================================
352
353 IOCTL calls for getting device parameters.
354
355 ======================================================================*/
356 static void mtdchar_erase_callback (struct erase_info *instr)
357 {
358 wake_up((wait_queue_head_t *)instr->priv);
359 }
360
361 #ifdef CONFIG_HAVE_MTD_OTP
362 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
363 {
364 struct mtd_info *mtd = mfi->mtd;
365 int ret = 0;
366
367 switch (mode) {
368 case MTD_OTP_FACTORY:
369 if (!mtd->read_fact_prot_reg)
370 ret = -EOPNOTSUPP;
371 else
372 mfi->mode = MTD_MODE_OTP_FACTORY;
373 break;
374 case MTD_OTP_USER:
375 if (!mtd->read_fact_prot_reg)
376 ret = -EOPNOTSUPP;
377 else
378 mfi->mode = MTD_MODE_OTP_USER;
379 break;
380 default:
381 ret = -EINVAL;
382 case MTD_OTP_OFF:
383 break;
384 }
385 return ret;
386 }
387 #else
388 # define otp_select_filemode(f,m) -EOPNOTSUPP
389 #endif
390
391 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
392 uint64_t start, uint32_t length, void __user *ptr,
393 uint32_t __user *retp)
394 {
395 struct mtd_oob_ops ops;
396 uint32_t retlen;
397 int ret = 0;
398
399 if (!(file->f_mode & FMODE_WRITE))
400 return -EPERM;
401
402 if (length > 4096)
403 return -EINVAL;
404
405 if (!mtd->write_oob)
406 ret = -EOPNOTSUPP;
407 else
408 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
409
410 if (ret)
411 return ret;
412
413 ops.ooblen = length;
414 ops.ooboffs = start & (mtd->oobsize - 1);
415 ops.datbuf = NULL;
416 ops.mode = MTD_OOB_PLACE;
417
418 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
419 return -EINVAL;
420
421 ops.oobbuf = memdup_user(ptr, length);
422 if (IS_ERR(ops.oobbuf))
423 return PTR_ERR(ops.oobbuf);
424
425 start &= ~((uint64_t)mtd->oobsize - 1);
426 ret = mtd->write_oob(mtd, start, &ops);
427
428 if (ops.oobretlen > 0xFFFFFFFFU)
429 ret = -EOVERFLOW;
430 retlen = ops.oobretlen;
431 if (copy_to_user(retp, &retlen, sizeof(length)))
432 ret = -EFAULT;
433
434 kfree(ops.oobbuf);
435 return ret;
436 }
437
438 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
439 uint32_t length, void __user *ptr, uint32_t __user *retp)
440 {
441 struct mtd_oob_ops ops;
442 int ret = 0;
443
444 if (length > 4096)
445 return -EINVAL;
446
447 if (!mtd->read_oob)
448 ret = -EOPNOTSUPP;
449 else
450 ret = access_ok(VERIFY_WRITE, ptr,
451 length) ? 0 : -EFAULT;
452 if (ret)
453 return ret;
454
455 ops.ooblen = length;
456 ops.ooboffs = start & (mtd->oobsize - 1);
457 ops.datbuf = NULL;
458 ops.mode = MTD_OOB_PLACE;
459
460 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
461 return -EINVAL;
462
463 ops.oobbuf = kmalloc(length, GFP_KERNEL);
464 if (!ops.oobbuf)
465 return -ENOMEM;
466
467 start &= ~((uint64_t)mtd->oobsize - 1);
468 ret = mtd->read_oob(mtd, start, &ops);
469
470 if (put_user(ops.oobretlen, retp))
471 ret = -EFAULT;
472 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
473 ops.oobretlen))
474 ret = -EFAULT;
475
476 kfree(ops.oobbuf);
477 return ret;
478 }
479
480 /*
481 * Copies (and truncates, if necessary) data from the larger struct,
482 * nand_ecclayout, to the smaller, deprecated layout struct,
483 * nand_ecclayout_user. This is necessary only to suppport the deprecated
484 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
485 * nand_ecclayout flexibly (i.e. the struct may change size in new
486 * releases without requiring major rewrites).
487 */
488 static int shrink_ecclayout(const struct nand_ecclayout *from,
489 struct nand_ecclayout_user *to)
490 {
491 int i;
492
493 if (!from || !to)
494 return -EINVAL;
495
496 memset(to, 0, sizeof(*to));
497
498 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES_OLD);
499 for (i = 0; i < to->eccbytes; i++)
500 to->eccpos[i] = from->eccpos[i];
501
502 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
503 if (from->oobfree[i].length == 0 &&
504 from->oobfree[i].offset == 0)
505 break;
506 to->oobavail += from->oobfree[i].length;
507 to->oobfree[i] = from->oobfree[i];
508 }
509
510 return 0;
511 }
512
513 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
514 {
515 struct mtd_file_info *mfi = file->private_data;
516 struct mtd_info *mtd = mfi->mtd;
517 void __user *argp = (void __user *)arg;
518 int ret = 0;
519 u_long size;
520 struct mtd_info_user info;
521
522 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
523
524 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
525 if (cmd & IOC_IN) {
526 if (!access_ok(VERIFY_READ, argp, size))
527 return -EFAULT;
528 }
529 if (cmd & IOC_OUT) {
530 if (!access_ok(VERIFY_WRITE, argp, size))
531 return -EFAULT;
532 }
533
534 switch (cmd) {
535 case MEMGETREGIONCOUNT:
536 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
537 return -EFAULT;
538 break;
539
540 case MEMGETREGIONINFO:
541 {
542 uint32_t ur_idx;
543 struct mtd_erase_region_info *kr;
544 struct region_info_user __user *ur = argp;
545
546 if (get_user(ur_idx, &(ur->regionindex)))
547 return -EFAULT;
548
549 kr = &(mtd->eraseregions[ur_idx]);
550
551 if (put_user(kr->offset, &(ur->offset))
552 || put_user(kr->erasesize, &(ur->erasesize))
553 || put_user(kr->numblocks, &(ur->numblocks)))
554 return -EFAULT;
555
556 break;
557 }
558
559 case MEMGETINFO:
560 info.type = mtd->type;
561 info.flags = mtd->flags;
562 info.size = mtd->size;
563 info.erasesize = mtd->erasesize;
564 info.writesize = mtd->writesize;
565 info.oobsize = mtd->oobsize;
566 /* The below fields are obsolete */
567 info.ecctype = -1;
568 info.eccsize = 0;
569 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
570 return -EFAULT;
571 break;
572
573 case MEMERASE:
574 case MEMERASE64:
575 {
576 struct erase_info *erase;
577
578 if(!(file->f_mode & FMODE_WRITE))
579 return -EPERM;
580
581 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
582 if (!erase)
583 ret = -ENOMEM;
584 else {
585 wait_queue_head_t waitq;
586 DECLARE_WAITQUEUE(wait, current);
587
588 init_waitqueue_head(&waitq);
589
590 if (cmd == MEMERASE64) {
591 struct erase_info_user64 einfo64;
592
593 if (copy_from_user(&einfo64, argp,
594 sizeof(struct erase_info_user64))) {
595 kfree(erase);
596 return -EFAULT;
597 }
598 erase->addr = einfo64.start;
599 erase->len = einfo64.length;
600 } else {
601 struct erase_info_user einfo32;
602
603 if (copy_from_user(&einfo32, argp,
604 sizeof(struct erase_info_user))) {
605 kfree(erase);
606 return -EFAULT;
607 }
608 erase->addr = einfo32.start;
609 erase->len = einfo32.length;
610 }
611 erase->mtd = mtd;
612 erase->callback = mtdchar_erase_callback;
613 erase->priv = (unsigned long)&waitq;
614
615 /*
616 FIXME: Allow INTERRUPTIBLE. Which means
617 not having the wait_queue head on the stack.
618
619 If the wq_head is on the stack, and we
620 leave because we got interrupted, then the
621 wq_head is no longer there when the
622 callback routine tries to wake us up.
623 */
624 ret = mtd->erase(mtd, erase);
625 if (!ret) {
626 set_current_state(TASK_UNINTERRUPTIBLE);
627 add_wait_queue(&waitq, &wait);
628 if (erase->state != MTD_ERASE_DONE &&
629 erase->state != MTD_ERASE_FAILED)
630 schedule();
631 remove_wait_queue(&waitq, &wait);
632 set_current_state(TASK_RUNNING);
633
634 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
635 }
636 kfree(erase);
637 }
638 break;
639 }
640
641 case MEMWRITEOOB:
642 {
643 struct mtd_oob_buf buf;
644 struct mtd_oob_buf __user *buf_user = argp;
645
646 /* NOTE: writes return length to buf_user->length */
647 if (copy_from_user(&buf, argp, sizeof(buf)))
648 ret = -EFAULT;
649 else
650 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
651 buf.ptr, &buf_user->length);
652 break;
653 }
654
655 case MEMREADOOB:
656 {
657 struct mtd_oob_buf buf;
658 struct mtd_oob_buf __user *buf_user = argp;
659
660 /* NOTE: writes return length to buf_user->start */
661 if (copy_from_user(&buf, argp, sizeof(buf)))
662 ret = -EFAULT;
663 else
664 ret = mtd_do_readoob(mtd, buf.start, buf.length,
665 buf.ptr, &buf_user->start);
666 break;
667 }
668
669 case MEMWRITEOOB64:
670 {
671 struct mtd_oob_buf64 buf;
672 struct mtd_oob_buf64 __user *buf_user = argp;
673
674 if (copy_from_user(&buf, argp, sizeof(buf)))
675 ret = -EFAULT;
676 else
677 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
678 (void __user *)(uintptr_t)buf.usr_ptr,
679 &buf_user->length);
680 break;
681 }
682
683 case MEMREADOOB64:
684 {
685 struct mtd_oob_buf64 buf;
686 struct mtd_oob_buf64 __user *buf_user = argp;
687
688 if (copy_from_user(&buf, argp, sizeof(buf)))
689 ret = -EFAULT;
690 else
691 ret = mtd_do_readoob(mtd, buf.start, buf.length,
692 (void __user *)(uintptr_t)buf.usr_ptr,
693 &buf_user->length);
694 break;
695 }
696
697 case MEMLOCK:
698 {
699 struct erase_info_user einfo;
700
701 if (copy_from_user(&einfo, argp, sizeof(einfo)))
702 return -EFAULT;
703
704 if (!mtd->lock)
705 ret = -EOPNOTSUPP;
706 else
707 ret = mtd->lock(mtd, einfo.start, einfo.length);
708 break;
709 }
710
711 case MEMUNLOCK:
712 {
713 struct erase_info_user einfo;
714
715 if (copy_from_user(&einfo, argp, sizeof(einfo)))
716 return -EFAULT;
717
718 if (!mtd->unlock)
719 ret = -EOPNOTSUPP;
720 else
721 ret = mtd->unlock(mtd, einfo.start, einfo.length);
722 break;
723 }
724
725 case MEMISLOCKED:
726 {
727 struct erase_info_user einfo;
728
729 if (copy_from_user(&einfo, argp, sizeof(einfo)))
730 return -EFAULT;
731
732 if (!mtd->is_locked)
733 ret = -EOPNOTSUPP;
734 else
735 ret = mtd->is_locked(mtd, einfo.start, einfo.length);
736 break;
737 }
738
739 /* Legacy interface */
740 case MEMGETOOBSEL:
741 {
742 struct nand_oobinfo oi;
743
744 if (!mtd->ecclayout)
745 return -EOPNOTSUPP;
746 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
747 return -EINVAL;
748
749 oi.useecc = MTD_NANDECC_AUTOPLACE;
750 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
751 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
752 sizeof(oi.oobfree));
753 oi.eccbytes = mtd->ecclayout->eccbytes;
754
755 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
756 return -EFAULT;
757 break;
758 }
759
760 case MEMGETBADBLOCK:
761 {
762 loff_t offs;
763
764 if (copy_from_user(&offs, argp, sizeof(loff_t)))
765 return -EFAULT;
766 if (!mtd->block_isbad)
767 ret = -EOPNOTSUPP;
768 else
769 return mtd->block_isbad(mtd, offs);
770 break;
771 }
772
773 case MEMSETBADBLOCK:
774 {
775 loff_t offs;
776
777 if (copy_from_user(&offs, argp, sizeof(loff_t)))
778 return -EFAULT;
779 if (!mtd->block_markbad)
780 ret = -EOPNOTSUPP;
781 else
782 return mtd->block_markbad(mtd, offs);
783 break;
784 }
785
786 #ifdef CONFIG_HAVE_MTD_OTP
787 case OTPSELECT:
788 {
789 int mode;
790 if (copy_from_user(&mode, argp, sizeof(int)))
791 return -EFAULT;
792
793 mfi->mode = MTD_MODE_NORMAL;
794
795 ret = otp_select_filemode(mfi, mode);
796
797 file->f_pos = 0;
798 break;
799 }
800
801 case OTPGETREGIONCOUNT:
802 case OTPGETREGIONINFO:
803 {
804 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
805 if (!buf)
806 return -ENOMEM;
807 ret = -EOPNOTSUPP;
808 switch (mfi->mode) {
809 case MTD_MODE_OTP_FACTORY:
810 if (mtd->get_fact_prot_info)
811 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
812 break;
813 case MTD_MODE_OTP_USER:
814 if (mtd->get_user_prot_info)
815 ret = mtd->get_user_prot_info(mtd, buf, 4096);
816 break;
817 default:
818 break;
819 }
820 if (ret >= 0) {
821 if (cmd == OTPGETREGIONCOUNT) {
822 int nbr = ret / sizeof(struct otp_info);
823 ret = copy_to_user(argp, &nbr, sizeof(int));
824 } else
825 ret = copy_to_user(argp, buf, ret);
826 if (ret)
827 ret = -EFAULT;
828 }
829 kfree(buf);
830 break;
831 }
832
833 case OTPLOCK:
834 {
835 struct otp_info oinfo;
836
837 if (mfi->mode != MTD_MODE_OTP_USER)
838 return -EINVAL;
839 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
840 return -EFAULT;
841 if (!mtd->lock_user_prot_reg)
842 return -EOPNOTSUPP;
843 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
844 break;
845 }
846 #endif
847
848 /* This ioctl is being deprecated - it truncates the ecc layout */
849 case ECCGETLAYOUT:
850 {
851 struct nand_ecclayout_user *usrlay;
852
853 if (!mtd->ecclayout)
854 return -EOPNOTSUPP;
855
856 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
857 if (!usrlay)
858 return -ENOMEM;
859
860 shrink_ecclayout(mtd->ecclayout, usrlay);
861
862 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
863 ret = -EFAULT;
864 kfree(usrlay);
865 break;
866 }
867
868 case ECCGETSTATS:
869 {
870 if (copy_to_user(argp, &mtd->ecc_stats,
871 sizeof(struct mtd_ecc_stats)))
872 return -EFAULT;
873 break;
874 }
875
876 case MTDFILEMODE:
877 {
878 mfi->mode = 0;
879
880 switch(arg) {
881 case MTD_MODE_OTP_FACTORY:
882 case MTD_MODE_OTP_USER:
883 ret = otp_select_filemode(mfi, arg);
884 break;
885
886 case MTD_MODE_RAW:
887 if (!mtd->read_oob || !mtd->write_oob)
888 return -EOPNOTSUPP;
889 mfi->mode = arg;
890
891 case MTD_MODE_NORMAL:
892 break;
893 default:
894 ret = -EINVAL;
895 }
896 file->f_pos = 0;
897 break;
898 }
899
900 default:
901 ret = -ENOTTY;
902 }
903
904 return ret;
905 } /* memory_ioctl */
906
907 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
908 {
909 int ret;
910
911 lock_kernel();
912 ret = mtd_ioctl(file, cmd, arg);
913 unlock_kernel();
914
915 return ret;
916 }
917
918 #ifdef CONFIG_COMPAT
919
920 struct mtd_oob_buf32 {
921 u_int32_t start;
922 u_int32_t length;
923 compat_caddr_t ptr; /* unsigned char* */
924 };
925
926 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
927 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
928
929 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
930 unsigned long arg)
931 {
932 struct mtd_file_info *mfi = file->private_data;
933 struct mtd_info *mtd = mfi->mtd;
934 void __user *argp = compat_ptr(arg);
935 int ret = 0;
936
937 lock_kernel();
938
939 switch (cmd) {
940 case MEMWRITEOOB32:
941 {
942 struct mtd_oob_buf32 buf;
943 struct mtd_oob_buf32 __user *buf_user = argp;
944
945 if (copy_from_user(&buf, argp, sizeof(buf)))
946 ret = -EFAULT;
947 else
948 ret = mtd_do_writeoob(file, mtd, buf.start,
949 buf.length, compat_ptr(buf.ptr),
950 &buf_user->length);
951 break;
952 }
953
954 case MEMREADOOB32:
955 {
956 struct mtd_oob_buf32 buf;
957 struct mtd_oob_buf32 __user *buf_user = argp;
958
959 /* NOTE: writes return length to buf->start */
960 if (copy_from_user(&buf, argp, sizeof(buf)))
961 ret = -EFAULT;
962 else
963 ret = mtd_do_readoob(mtd, buf.start,
964 buf.length, compat_ptr(buf.ptr),
965 &buf_user->start);
966 break;
967 }
968 default:
969 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
970 }
971
972 unlock_kernel();
973
974 return ret;
975 }
976
977 #endif /* CONFIG_COMPAT */
978
979 /*
980 * try to determine where a shared mapping can be made
981 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
982 * mappings)
983 */
984 #ifndef CONFIG_MMU
985 static unsigned long mtd_get_unmapped_area(struct file *file,
986 unsigned long addr,
987 unsigned long len,
988 unsigned long pgoff,
989 unsigned long flags)
990 {
991 struct mtd_file_info *mfi = file->private_data;
992 struct mtd_info *mtd = mfi->mtd;
993
994 if (mtd->get_unmapped_area) {
995 unsigned long offset;
996
997 if (addr != 0)
998 return (unsigned long) -EINVAL;
999
1000 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1001 return (unsigned long) -EINVAL;
1002
1003 offset = pgoff << PAGE_SHIFT;
1004 if (offset > mtd->size - len)
1005 return (unsigned long) -EINVAL;
1006
1007 return mtd->get_unmapped_area(mtd, len, offset, flags);
1008 }
1009
1010 /* can't map directly */
1011 return (unsigned long) -ENOSYS;
1012 }
1013 #endif
1014
1015 /*
1016 * set up a mapping for shared memory segments
1017 */
1018 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
1019 {
1020 #ifdef CONFIG_MMU
1021 struct mtd_file_info *mfi = file->private_data;
1022 struct mtd_info *mtd = mfi->mtd;
1023 struct map_info *map = mtd->priv;
1024 unsigned long start;
1025 unsigned long off;
1026 u32 len;
1027
1028 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
1029 off = vma->vm_pgoff << PAGE_SHIFT;
1030 start = map->phys;
1031 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
1032 start &= PAGE_MASK;
1033 if ((vma->vm_end - vma->vm_start + off) > len)
1034 return -EINVAL;
1035
1036 off += start;
1037 vma->vm_pgoff = off >> PAGE_SHIFT;
1038 vma->vm_flags |= VM_IO | VM_RESERVED;
1039
1040 #ifdef pgprot_noncached
1041 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1042 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1043 #endif
1044 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1045 vma->vm_end - vma->vm_start,
1046 vma->vm_page_prot))
1047 return -EAGAIN;
1048
1049 return 0;
1050 }
1051 return -ENOSYS;
1052 #else
1053 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1054 #endif
1055 }
1056
1057 static const struct file_operations mtd_fops = {
1058 .owner = THIS_MODULE,
1059 .llseek = mtd_lseek,
1060 .read = mtd_read,
1061 .write = mtd_write,
1062 .unlocked_ioctl = mtd_unlocked_ioctl,
1063 #ifdef CONFIG_COMPAT
1064 .compat_ioctl = mtd_compat_ioctl,
1065 #endif
1066 .open = mtd_open,
1067 .release = mtd_close,
1068 .mmap = mtd_mmap,
1069 #ifndef CONFIG_MMU
1070 .get_unmapped_area = mtd_get_unmapped_area,
1071 #endif
1072 };
1073
1074 static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags,
1075 const char *dev_name, void *data,
1076 struct vfsmount *mnt)
1077 {
1078 return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
1079 mnt);
1080 }
1081
1082 static struct file_system_type mtd_inodefs_type = {
1083 .name = "mtd_inodefs",
1084 .get_sb = mtd_inodefs_get_sb,
1085 .kill_sb = kill_anon_super,
1086 };
1087
1088 static void mtdchar_notify_add(struct mtd_info *mtd)
1089 {
1090 }
1091
1092 static void mtdchar_notify_remove(struct mtd_info *mtd)
1093 {
1094 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1095
1096 if (mtd_ino) {
1097 /* Destroy the inode if it exists */
1098 mtd_ino->i_nlink = 0;
1099 iput(mtd_ino);
1100 }
1101 }
1102
1103 static struct mtd_notifier mtdchar_notifier = {
1104 .add = mtdchar_notify_add,
1105 .remove = mtdchar_notify_remove,
1106 };
1107
1108 static int __init init_mtdchar(void)
1109 {
1110 int ret;
1111
1112 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1113 "mtd", &mtd_fops);
1114 if (ret < 0) {
1115 pr_notice("Can't allocate major number %d for "
1116 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1117 return ret;
1118 }
1119
1120 ret = register_filesystem(&mtd_inodefs_type);
1121 if (ret) {
1122 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1123 goto err_unregister_chdev;
1124 }
1125
1126 mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1127 if (IS_ERR(mtd_inode_mnt)) {
1128 ret = PTR_ERR(mtd_inode_mnt);
1129 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1130 goto err_unregister_filesystem;
1131 }
1132 register_mtd_user(&mtdchar_notifier);
1133
1134 return ret;
1135
1136 err_unregister_filesystem:
1137 unregister_filesystem(&mtd_inodefs_type);
1138 err_unregister_chdev:
1139 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1140 return ret;
1141 }
1142
1143 static void __exit cleanup_mtdchar(void)
1144 {
1145 unregister_mtd_user(&mtdchar_notifier);
1146 mntput(mtd_inode_mnt);
1147 unregister_filesystem(&mtd_inodefs_type);
1148 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1149 }
1150
1151 module_init(init_mtdchar);
1152 module_exit(cleanup_mtdchar);
1153
1154 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1155
1156 MODULE_LICENSE("GPL");
1157 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1158 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1159 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linux kernel - Deliverables
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