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1/*
2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 */
19
20#include <linux/device.h>
21#include <linux/fs.h>
22#include <linux/mm.h>
23#include <linux/err.h>
24#include <linux/init.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/sched.h>
29#include <linux/mutex.h>
30#include <linux/backing-dev.h>
31#include <linux/compat.h>
32#include <linux/mount.h>
33#include <linux/blkpg.h>
34#include <linux/magic.h>
35#include <linux/major.h>
36#include <linux/mtd/mtd.h>
37#include <linux/mtd/partitions.h>
38#include <linux/mtd/map.h>
39
40#include <asm/uaccess.h>
41
42#include "mtdcore.h"
43
44static DEFINE_MUTEX(mtd_mutex);
45
46/*
47 * Data structure to hold the pointer to the mtd device as well
48 * as mode information of various use cases.
49 */
50struct mtd_file_info {
51 struct mtd_info *mtd;
52 enum mtd_file_modes mode;
53};
54
55static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
56{
57 struct mtd_file_info *mfi = file->private_data;
58 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
59}
60
61static int mtdchar_open(struct inode *inode, struct file *file)
62{
63 int minor = iminor(inode);
64 int devnum = minor >> 1;
65 int ret = 0;
66 struct mtd_info *mtd;
67 struct mtd_file_info *mfi;
68
69 pr_debug("MTD_open\n");
70
71 /* You can't open the RO devices RW */
72 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
73 return -EACCES;
74
75 mutex_lock(&mtd_mutex);
76 mtd = get_mtd_device(NULL, devnum);
77
78 if (IS_ERR(mtd)) {
79 ret = PTR_ERR(mtd);
80 goto out;
81 }
82
83 if (mtd->type == MTD_ABSENT) {
84 ret = -ENODEV;
85 goto out1;
86 }
87
88 /* You can't open it RW if it's not a writeable device */
89 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
90 ret = -EACCES;
91 goto out1;
92 }
93
94 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
95 if (!mfi) {
96 ret = -ENOMEM;
97 goto out1;
98 }
99 mfi->mtd = mtd;
100 file->private_data = mfi;
101 mutex_unlock(&mtd_mutex);
102 return 0;
103
104out1:
105 put_mtd_device(mtd);
106out:
107 mutex_unlock(&mtd_mutex);
108 return ret;
109} /* mtdchar_open */
110
111/*====================================================================*/
112
113static int mtdchar_close(struct inode *inode, struct file *file)
114{
115 struct mtd_file_info *mfi = file->private_data;
116 struct mtd_info *mtd = mfi->mtd;
117
118 pr_debug("MTD_close\n");
119
120 /* Only sync if opened RW */
121 if ((file->f_mode & FMODE_WRITE))
122 mtd_sync(mtd);
123
124 put_mtd_device(mtd);
125 file->private_data = NULL;
126 kfree(mfi);
127
128 return 0;
129} /* mtdchar_close */
130
131/* Back in June 2001, dwmw2 wrote:
132 *
133 * FIXME: This _really_ needs to die. In 2.5, we should lock the
134 * userspace buffer down and use it directly with readv/writev.
135 *
136 * The implementation below, using mtd_kmalloc_up_to, mitigates
137 * allocation failures when the system is under low-memory situations
138 * or if memory is highly fragmented at the cost of reducing the
139 * performance of the requested transfer due to a smaller buffer size.
140 *
141 * A more complex but more memory-efficient implementation based on
142 * get_user_pages and iovecs to cover extents of those pages is a
143 * longer-term goal, as intimated by dwmw2 above. However, for the
144 * write case, this requires yet more complex head and tail transfer
145 * handling when those head and tail offsets and sizes are such that
146 * alignment requirements are not met in the NAND subdriver.
147 */
148
149static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
150 loff_t *ppos)
151{
152 struct mtd_file_info *mfi = file->private_data;
153 struct mtd_info *mtd = mfi->mtd;
154 size_t retlen;
155 size_t total_retlen=0;
156 int ret=0;
157 int len;
158 size_t size = count;
159 char *kbuf;
160
161 pr_debug("MTD_read\n");
162
163 if (*ppos + count > mtd->size)
164 count = mtd->size - *ppos;
165
166 if (!count)
167 return 0;
168
169 kbuf = mtd_kmalloc_up_to(mtd, &size);
170 if (!kbuf)
171 return -ENOMEM;
172
173 while (count) {
174 len = min_t(size_t, count, size);
175
176 switch (mfi->mode) {
177 case MTD_FILE_MODE_OTP_FACTORY:
178 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
179 &retlen, kbuf);
180 break;
181 case MTD_FILE_MODE_OTP_USER:
182 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
183 &retlen, kbuf);
184 break;
185 case MTD_FILE_MODE_RAW:
186 {
187 struct mtd_oob_ops ops;
188
189 ops.mode = MTD_OPS_RAW;
190 ops.datbuf = kbuf;
191 ops.oobbuf = NULL;
192 ops.len = len;
193
194 ret = mtd_read_oob(mtd, *ppos, &ops);
195 retlen = ops.retlen;
196 break;
197 }
198 default:
199 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
200 }
201 /* Nand returns -EBADMSG on ECC errors, but it returns
202 * the data. For our userspace tools it is important
203 * to dump areas with ECC errors!
204 * For kernel internal usage it also might return -EUCLEAN
205 * to signal the caller that a bitflip has occurred and has
206 * been corrected by the ECC algorithm.
207 * Userspace software which accesses NAND this way
208 * must be aware of the fact that it deals with NAND
209 */
210 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
211 *ppos += retlen;
212 if (copy_to_user(buf, kbuf, retlen)) {
213 kfree(kbuf);
214 return -EFAULT;
215 }
216 else
217 total_retlen += retlen;
218
219 count -= retlen;
220 buf += retlen;
221 if (retlen == 0)
222 count = 0;
223 }
224 else {
225 kfree(kbuf);
226 return ret;
227 }
228
229 }
230
231 kfree(kbuf);
232 return total_retlen;
233} /* mtdchar_read */
234
235static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
236 loff_t *ppos)
237{
238 struct mtd_file_info *mfi = file->private_data;
239 struct mtd_info *mtd = mfi->mtd;
240 size_t size = count;
241 char *kbuf;
242 size_t retlen;
243 size_t total_retlen=0;
244 int ret=0;
245 int len;
246
247 pr_debug("MTD_write\n");
248
249 if (*ppos == mtd->size)
250 return -ENOSPC;
251
252 if (*ppos + count > mtd->size)
253 count = mtd->size - *ppos;
254
255 if (!count)
256 return 0;
257
258 kbuf = mtd_kmalloc_up_to(mtd, &size);
259 if (!kbuf)
260 return -ENOMEM;
261
262 while (count) {
263 len = min_t(size_t, count, size);
264
265 if (copy_from_user(kbuf, buf, len)) {
266 kfree(kbuf);
267 return -EFAULT;
268 }
269
270 switch (mfi->mode) {
271 case MTD_FILE_MODE_OTP_FACTORY:
272 ret = -EROFS;
273 break;
274 case MTD_FILE_MODE_OTP_USER:
275 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
276 &retlen, kbuf);
277 break;
278
279 case MTD_FILE_MODE_RAW:
280 {
281 struct mtd_oob_ops ops;
282
283 ops.mode = MTD_OPS_RAW;
284 ops.datbuf = kbuf;
285 ops.oobbuf = NULL;
286 ops.ooboffs = 0;
287 ops.len = len;
288
289 ret = mtd_write_oob(mtd, *ppos, &ops);
290 retlen = ops.retlen;
291 break;
292 }
293
294 default:
295 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
296 }
297
298 /*
299 * Return -ENOSPC only if no data could be written at all.
300 * Otherwise just return the number of bytes that actually
301 * have been written.
302 */
303 if ((ret == -ENOSPC) && (total_retlen))
304 break;
305
306 if (!ret) {
307 *ppos += retlen;
308 total_retlen += retlen;
309 count -= retlen;
310 buf += retlen;
311 }
312 else {
313 kfree(kbuf);
314 return ret;
315 }
316 }
317
318 kfree(kbuf);
319 return total_retlen;
320} /* mtdchar_write */
321
322/*======================================================================
323
324 IOCTL calls for getting device parameters.
325
326======================================================================*/
327static void mtdchar_erase_callback (struct erase_info *instr)
328{
329 wake_up((wait_queue_head_t *)instr->priv);
330}
331
332static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
333{
334 struct mtd_info *mtd = mfi->mtd;
335 size_t retlen;
336
337 switch (mode) {
338 case MTD_OTP_FACTORY:
339 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
340 -EOPNOTSUPP)
341 return -EOPNOTSUPP;
342
343 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
344 break;
345 case MTD_OTP_USER:
346 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
347 -EOPNOTSUPP)
348 return -EOPNOTSUPP;
349
350 mfi->mode = MTD_FILE_MODE_OTP_USER;
351 break;
352 case MTD_OTP_OFF:
353 mfi->mode = MTD_FILE_MODE_NORMAL;
354 break;
355 default:
356 return -EINVAL;
357 }
358
359 return 0;
360}
361
362static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
363 uint64_t start, uint32_t length, void __user *ptr,
364 uint32_t __user *retp)
365{
366 struct mtd_file_info *mfi = file->private_data;
367 struct mtd_oob_ops ops;
368 uint32_t retlen;
369 int ret = 0;
370
371 if (!(file->f_mode & FMODE_WRITE))
372 return -EPERM;
373
374 if (length > 4096)
375 return -EINVAL;
376
377 if (!mtd->_write_oob)
378 ret = -EOPNOTSUPP;
379 else
380 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
381
382 if (ret)
383 return ret;
384
385 ops.ooblen = length;
386 ops.ooboffs = start & (mtd->writesize - 1);
387 ops.datbuf = NULL;
388 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
389 MTD_OPS_PLACE_OOB;
390
391 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
392 return -EINVAL;
393
394 ops.oobbuf = memdup_user(ptr, length);
395 if (IS_ERR(ops.oobbuf))
396 return PTR_ERR(ops.oobbuf);
397
398 start &= ~((uint64_t)mtd->writesize - 1);
399 ret = mtd_write_oob(mtd, start, &ops);
400
401 if (ops.oobretlen > 0xFFFFFFFFU)
402 ret = -EOVERFLOW;
403 retlen = ops.oobretlen;
404 if (copy_to_user(retp, &retlen, sizeof(length)))
405 ret = -EFAULT;
406
407 kfree(ops.oobbuf);
408 return ret;
409}
410
411static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
412 uint64_t start, uint32_t length, void __user *ptr,
413 uint32_t __user *retp)
414{
415 struct mtd_file_info *mfi = file->private_data;
416 struct mtd_oob_ops ops;
417 int ret = 0;
418
419 if (length > 4096)
420 return -EINVAL;
421
422 if (!access_ok(VERIFY_WRITE, ptr, length))
423 return -EFAULT;
424
425 ops.ooblen = length;
426 ops.ooboffs = start & (mtd->writesize - 1);
427 ops.datbuf = NULL;
428 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
429 MTD_OPS_PLACE_OOB;
430
431 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
432 return -EINVAL;
433
434 ops.oobbuf = kmalloc(length, GFP_KERNEL);
435 if (!ops.oobbuf)
436 return -ENOMEM;
437
438 start &= ~((uint64_t)mtd->writesize - 1);
439 ret = mtd_read_oob(mtd, start, &ops);
440
441 if (put_user(ops.oobretlen, retp))
442 ret = -EFAULT;
443 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
444 ops.oobretlen))
445 ret = -EFAULT;
446
447 kfree(ops.oobbuf);
448
449 /*
450 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
451 * data. For our userspace tools it is important to dump areas
452 * with ECC errors!
453 * For kernel internal usage it also might return -EUCLEAN
454 * to signal the caller that a bitflip has occured and has
455 * been corrected by the ECC algorithm.
456 *
457 * Note: currently the standard NAND function, nand_read_oob_std,
458 * does not calculate ECC for the OOB area, so do not rely on
459 * this behavior unless you have replaced it with your own.
460 */
461 if (mtd_is_bitflip_or_eccerr(ret))
462 return 0;
463
464 return ret;
465}
466
467/*
468 * Copies (and truncates, if necessary) data from the larger struct,
469 * nand_ecclayout, to the smaller, deprecated layout struct,
470 * nand_ecclayout_user. This is necessary only to support the deprecated
471 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
472 * nand_ecclayout flexibly (i.e. the struct may change size in new
473 * releases without requiring major rewrites).
474 */
475static int shrink_ecclayout(const struct nand_ecclayout *from,
476 struct nand_ecclayout_user *to)
477{
478 int i;
479
480 if (!from || !to)
481 return -EINVAL;
482
483 memset(to, 0, sizeof(*to));
484
485 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
486 for (i = 0; i < to->eccbytes; i++)
487 to->eccpos[i] = from->eccpos[i];
488
489 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
490 if (from->oobfree[i].length == 0 &&
491 from->oobfree[i].offset == 0)
492 break;
493 to->oobavail += from->oobfree[i].length;
494 to->oobfree[i] = from->oobfree[i];
495 }
496
497 return 0;
498}
499
500static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
501 struct blkpg_ioctl_arg *arg)
502{
503 struct blkpg_partition p;
504
505 if (!capable(CAP_SYS_ADMIN))
506 return -EPERM;
507
508 if (copy_from_user(&p, arg->data, sizeof(p)))
509 return -EFAULT;
510
511 switch (arg->op) {
512 case BLKPG_ADD_PARTITION:
513
514 /* Only master mtd device must be used to add partitions */
515 if (mtd_is_partition(mtd))
516 return -EINVAL;
517
518 /* Sanitize user input */
519 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
520
521 return mtd_add_partition(mtd, p.devname, p.start, p.length);
522
523 case BLKPG_DEL_PARTITION:
524
525 if (p.pno < 0)
526 return -EINVAL;
527
528 return mtd_del_partition(mtd, p.pno);
529
530 default:
531 return -EINVAL;
532 }
533}
534
535static int mtdchar_write_ioctl(struct mtd_info *mtd,
536 struct mtd_write_req __user *argp)
537{
538 struct mtd_write_req req;
539 struct mtd_oob_ops ops;
540 const void __user *usr_data, *usr_oob;
541 int ret;
542
543 if (copy_from_user(&req, argp, sizeof(req)))
544 return -EFAULT;
545
546 usr_data = (const void __user *)(uintptr_t)req.usr_data;
547 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
548 if (!access_ok(VERIFY_READ, usr_data, req.len) ||
549 !access_ok(VERIFY_READ, usr_oob, req.ooblen))
550 return -EFAULT;
551
552 if (!mtd->_write_oob)
553 return -EOPNOTSUPP;
554
555 ops.mode = req.mode;
556 ops.len = (size_t)req.len;
557 ops.ooblen = (size_t)req.ooblen;
558 ops.ooboffs = 0;
559
560 if (usr_data) {
561 ops.datbuf = memdup_user(usr_data, ops.len);
562 if (IS_ERR(ops.datbuf))
563 return PTR_ERR(ops.datbuf);
564 } else {
565 ops.datbuf = NULL;
566 }
567
568 if (usr_oob) {
569 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
570 if (IS_ERR(ops.oobbuf)) {
571 kfree(ops.datbuf);
572 return PTR_ERR(ops.oobbuf);
573 }
574 } else {
575 ops.oobbuf = NULL;
576 }
577
578 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
579
580 kfree(ops.datbuf);
581 kfree(ops.oobbuf);
582
583 return ret;
584}
585
586static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
587{
588 struct mtd_file_info *mfi = file->private_data;
589 struct mtd_info *mtd = mfi->mtd;
590 void __user *argp = (void __user *)arg;
591 int ret = 0;
592 u_long size;
593 struct mtd_info_user info;
594
595 pr_debug("MTD_ioctl\n");
596
597 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
598 if (cmd & IOC_IN) {
599 if (!access_ok(VERIFY_READ, argp, size))
600 return -EFAULT;
601 }
602 if (cmd & IOC_OUT) {
603 if (!access_ok(VERIFY_WRITE, argp, size))
604 return -EFAULT;
605 }
606
607 switch (cmd) {
608 case MEMGETREGIONCOUNT:
609 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
610 return -EFAULT;
611 break;
612
613 case MEMGETREGIONINFO:
614 {
615 uint32_t ur_idx;
616 struct mtd_erase_region_info *kr;
617 struct region_info_user __user *ur = argp;
618
619 if (get_user(ur_idx, &(ur->regionindex)))
620 return -EFAULT;
621
622 if (ur_idx >= mtd->numeraseregions)
623 return -EINVAL;
624
625 kr = &(mtd->eraseregions[ur_idx]);
626
627 if (put_user(kr->offset, &(ur->offset))
628 || put_user(kr->erasesize, &(ur->erasesize))
629 || put_user(kr->numblocks, &(ur->numblocks)))
630 return -EFAULT;
631
632 break;
633 }
634
635 case MEMGETINFO:
636 memset(&info, 0, sizeof(info));
637 info.type = mtd->type;
638 info.flags = mtd->flags;
639 info.size = mtd->size;
640 info.erasesize = mtd->erasesize;
641 info.writesize = mtd->writesize;
642 info.oobsize = mtd->oobsize;
643 /* The below field is obsolete */
644 info.padding = 0;
645 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
646 return -EFAULT;
647 break;
648
649 case MEMERASE:
650 case MEMERASE64:
651 {
652 struct erase_info *erase;
653
654 if(!(file->f_mode & FMODE_WRITE))
655 return -EPERM;
656
657 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
658 if (!erase)
659 ret = -ENOMEM;
660 else {
661 wait_queue_head_t waitq;
662 DECLARE_WAITQUEUE(wait, current);
663
664 init_waitqueue_head(&waitq);
665
666 if (cmd == MEMERASE64) {
667 struct erase_info_user64 einfo64;
668
669 if (copy_from_user(&einfo64, argp,
670 sizeof(struct erase_info_user64))) {
671 kfree(erase);
672 return -EFAULT;
673 }
674 erase->addr = einfo64.start;
675 erase->len = einfo64.length;
676 } else {
677 struct erase_info_user einfo32;
678
679 if (copy_from_user(&einfo32, argp,
680 sizeof(struct erase_info_user))) {
681 kfree(erase);
682 return -EFAULT;
683 }
684 erase->addr = einfo32.start;
685 erase->len = einfo32.length;
686 }
687 erase->mtd = mtd;
688 erase->callback = mtdchar_erase_callback;
689 erase->priv = (unsigned long)&waitq;
690
691 /*
692 FIXME: Allow INTERRUPTIBLE. Which means
693 not having the wait_queue head on the stack.
694
695 If the wq_head is on the stack, and we
696 leave because we got interrupted, then the
697 wq_head is no longer there when the
698 callback routine tries to wake us up.
699 */
700 ret = mtd_erase(mtd, erase);
701 if (!ret) {
702 set_current_state(TASK_UNINTERRUPTIBLE);
703 add_wait_queue(&waitq, &wait);
704 if (erase->state != MTD_ERASE_DONE &&
705 erase->state != MTD_ERASE_FAILED)
706 schedule();
707 remove_wait_queue(&waitq, &wait);
708 set_current_state(TASK_RUNNING);
709
710 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
711 }
712 kfree(erase);
713 }
714 break;
715 }
716
717 case MEMWRITEOOB:
718 {
719 struct mtd_oob_buf buf;
720 struct mtd_oob_buf __user *buf_user = argp;
721
722 /* NOTE: writes return length to buf_user->length */
723 if (copy_from_user(&buf, argp, sizeof(buf)))
724 ret = -EFAULT;
725 else
726 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
727 buf.ptr, &buf_user->length);
728 break;
729 }
730
731 case MEMREADOOB:
732 {
733 struct mtd_oob_buf buf;
734 struct mtd_oob_buf __user *buf_user = argp;
735
736 /* NOTE: writes return length to buf_user->start */
737 if (copy_from_user(&buf, argp, sizeof(buf)))
738 ret = -EFAULT;
739 else
740 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
741 buf.ptr, &buf_user->start);
742 break;
743 }
744
745 case MEMWRITEOOB64:
746 {
747 struct mtd_oob_buf64 buf;
748 struct mtd_oob_buf64 __user *buf_user = argp;
749
750 if (copy_from_user(&buf, argp, sizeof(buf)))
751 ret = -EFAULT;
752 else
753 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
754 (void __user *)(uintptr_t)buf.usr_ptr,
755 &buf_user->length);
756 break;
757 }
758
759 case MEMREADOOB64:
760 {
761 struct mtd_oob_buf64 buf;
762 struct mtd_oob_buf64 __user *buf_user = argp;
763
764 if (copy_from_user(&buf, argp, sizeof(buf)))
765 ret = -EFAULT;
766 else
767 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
768 (void __user *)(uintptr_t)buf.usr_ptr,
769 &buf_user->length);
770 break;
771 }
772
773 case MEMWRITE:
774 {
775 ret = mtdchar_write_ioctl(mtd,
776 (struct mtd_write_req __user *)arg);
777 break;
778 }
779
780 case MEMLOCK:
781 {
782 struct erase_info_user einfo;
783
784 if (copy_from_user(&einfo, argp, sizeof(einfo)))
785 return -EFAULT;
786
787 ret = mtd_lock(mtd, einfo.start, einfo.length);
788 break;
789 }
790
791 case MEMUNLOCK:
792 {
793 struct erase_info_user einfo;
794
795 if (copy_from_user(&einfo, argp, sizeof(einfo)))
796 return -EFAULT;
797
798 ret = mtd_unlock(mtd, einfo.start, einfo.length);
799 break;
800 }
801
802 case MEMISLOCKED:
803 {
804 struct erase_info_user einfo;
805
806 if (copy_from_user(&einfo, argp, sizeof(einfo)))
807 return -EFAULT;
808
809 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
810 break;
811 }
812
813 /* Legacy interface */
814 case MEMGETOOBSEL:
815 {
816 struct nand_oobinfo oi;
817
818 if (!mtd->ecclayout)
819 return -EOPNOTSUPP;
820 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
821 return -EINVAL;
822
823 oi.useecc = MTD_NANDECC_AUTOPLACE;
824 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
825 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
826 sizeof(oi.oobfree));
827 oi.eccbytes = mtd->ecclayout->eccbytes;
828
829 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
830 return -EFAULT;
831 break;
832 }
833
834 case MEMGETBADBLOCK:
835 {
836 loff_t offs;
837
838 if (copy_from_user(&offs, argp, sizeof(loff_t)))
839 return -EFAULT;
840 return mtd_block_isbad(mtd, offs);
841 break;
842 }
843
844 case MEMSETBADBLOCK:
845 {
846 loff_t offs;
847
848 if (copy_from_user(&offs, argp, sizeof(loff_t)))
849 return -EFAULT;
850 return mtd_block_markbad(mtd, offs);
851 break;
852 }
853
854 case OTPSELECT:
855 {
856 int mode;
857 if (copy_from_user(&mode, argp, sizeof(int)))
858 return -EFAULT;
859
860 mfi->mode = MTD_FILE_MODE_NORMAL;
861
862 ret = otp_select_filemode(mfi, mode);
863
864 file->f_pos = 0;
865 break;
866 }
867
868 case OTPGETREGIONCOUNT:
869 case OTPGETREGIONINFO:
870 {
871 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
872 size_t retlen;
873 if (!buf)
874 return -ENOMEM;
875 switch (mfi->mode) {
876 case MTD_FILE_MODE_OTP_FACTORY:
877 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
878 break;
879 case MTD_FILE_MODE_OTP_USER:
880 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
881 break;
882 default:
883 ret = -EINVAL;
884 break;
885 }
886 if (!ret) {
887 if (cmd == OTPGETREGIONCOUNT) {
888 int nbr = retlen / sizeof(struct otp_info);
889 ret = copy_to_user(argp, &nbr, sizeof(int));
890 } else
891 ret = copy_to_user(argp, buf, retlen);
892 if (ret)
893 ret = -EFAULT;
894 }
895 kfree(buf);
896 break;
897 }
898
899 case OTPLOCK:
900 {
901 struct otp_info oinfo;
902
903 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
904 return -EINVAL;
905 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
906 return -EFAULT;
907 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
908 break;
909 }
910
911 /* This ioctl is being deprecated - it truncates the ECC layout */
912 case ECCGETLAYOUT:
913 {
914 struct nand_ecclayout_user *usrlay;
915
916 if (!mtd->ecclayout)
917 return -EOPNOTSUPP;
918
919 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
920 if (!usrlay)
921 return -ENOMEM;
922
923 shrink_ecclayout(mtd->ecclayout, usrlay);
924
925 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
926 ret = -EFAULT;
927 kfree(usrlay);
928 break;
929 }
930
931 case ECCGETSTATS:
932 {
933 if (copy_to_user(argp, &mtd->ecc_stats,
934 sizeof(struct mtd_ecc_stats)))
935 return -EFAULT;
936 break;
937 }
938
939 case MTDFILEMODE:
940 {
941 mfi->mode = 0;
942
943 switch(arg) {
944 case MTD_FILE_MODE_OTP_FACTORY:
945 case MTD_FILE_MODE_OTP_USER:
946 ret = otp_select_filemode(mfi, arg);
947 break;
948
949 case MTD_FILE_MODE_RAW:
950 if (!mtd_has_oob(mtd))
951 return -EOPNOTSUPP;
952 mfi->mode = arg;
953
954 case MTD_FILE_MODE_NORMAL:
955 break;
956 default:
957 ret = -EINVAL;
958 }
959 file->f_pos = 0;
960 break;
961 }
962
963 case BLKPG:
964 {
965 struct blkpg_ioctl_arg __user *blk_arg = argp;
966 struct blkpg_ioctl_arg a;
967
968 if (copy_from_user(&a, blk_arg, sizeof(a)))
969 ret = -EFAULT;
970 else
971 ret = mtdchar_blkpg_ioctl(mtd, &a);
972 break;
973 }
974
975 case BLKRRPART:
976 {
977 /* No reread partition feature. Just return ok */
978 ret = 0;
979 break;
980 }
981
982 default:
983 ret = -ENOTTY;
984 }
985
986 return ret;
987} /* memory_ioctl */
988
989static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
990{
991 int ret;
992
993 mutex_lock(&mtd_mutex);
994 ret = mtdchar_ioctl(file, cmd, arg);
995 mutex_unlock(&mtd_mutex);
996
997 return ret;
998}
999
1000#ifdef CONFIG_COMPAT
1001
1002struct mtd_oob_buf32 {
1003 u_int32_t start;
1004 u_int32_t length;
1005 compat_caddr_t ptr; /* unsigned char* */
1006};
1007
1008#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1009#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1010
1011static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1012 unsigned long arg)
1013{
1014 struct mtd_file_info *mfi = file->private_data;
1015 struct mtd_info *mtd = mfi->mtd;
1016 void __user *argp = compat_ptr(arg);
1017 int ret = 0;
1018
1019 mutex_lock(&mtd_mutex);
1020
1021 switch (cmd) {
1022 case MEMWRITEOOB32:
1023 {
1024 struct mtd_oob_buf32 buf;
1025 struct mtd_oob_buf32 __user *buf_user = argp;
1026
1027 if (copy_from_user(&buf, argp, sizeof(buf)))
1028 ret = -EFAULT;
1029 else
1030 ret = mtdchar_writeoob(file, mtd, buf.start,
1031 buf.length, compat_ptr(buf.ptr),
1032 &buf_user->length);
1033 break;
1034 }
1035
1036 case MEMREADOOB32:
1037 {
1038 struct mtd_oob_buf32 buf;
1039 struct mtd_oob_buf32 __user *buf_user = argp;
1040
1041 /* NOTE: writes return length to buf->start */
1042 if (copy_from_user(&buf, argp, sizeof(buf)))
1043 ret = -EFAULT;
1044 else
1045 ret = mtdchar_readoob(file, mtd, buf.start,
1046 buf.length, compat_ptr(buf.ptr),
1047 &buf_user->start);
1048 break;
1049 }
1050
1051 case BLKPG:
1052 {
1053 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1054 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1055 struct blkpg_compat_ioctl_arg compat_arg;
1056 struct blkpg_ioctl_arg a;
1057
1058 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1059 ret = -EFAULT;
1060 break;
1061 }
1062
1063 memset(&a, 0, sizeof(a));
1064 a.op = compat_arg.op;
1065 a.flags = compat_arg.flags;
1066 a.datalen = compat_arg.datalen;
1067 a.data = compat_ptr(compat_arg.data);
1068
1069 ret = mtdchar_blkpg_ioctl(mtd, &a);
1070 break;
1071 }
1072
1073 default:
1074 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1075 }
1076
1077 mutex_unlock(&mtd_mutex);
1078
1079 return ret;
1080}
1081
1082#endif /* CONFIG_COMPAT */
1083
1084/*
1085 * try to determine where a shared mapping can be made
1086 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1087 * mappings)
1088 */
1089#ifndef CONFIG_MMU
1090static unsigned long mtdchar_get_unmapped_area(struct file *file,
1091 unsigned long addr,
1092 unsigned long len,
1093 unsigned long pgoff,
1094 unsigned long flags)
1095{
1096 struct mtd_file_info *mfi = file->private_data;
1097 struct mtd_info *mtd = mfi->mtd;
1098 unsigned long offset;
1099 int ret;
1100
1101 if (addr != 0)
1102 return (unsigned long) -EINVAL;
1103
1104 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1105 return (unsigned long) -EINVAL;
1106
1107 offset = pgoff << PAGE_SHIFT;
1108 if (offset > mtd->size - len)
1109 return (unsigned long) -EINVAL;
1110
1111 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1112 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1113}
1114
1115static unsigned mtdchar_mmap_capabilities(struct file *file)
1116{
1117 struct mtd_file_info *mfi = file->private_data;
1118
1119 return mtd_mmap_capabilities(mfi->mtd);
1120}
1121#endif
1122
1123/*
1124 * set up a mapping for shared memory segments
1125 */
1126static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1127{
1128#ifdef CONFIG_MMU
1129 struct mtd_file_info *mfi = file->private_data;
1130 struct mtd_info *mtd = mfi->mtd;
1131 struct map_info *map = mtd->priv;
1132
1133 /* This is broken because it assumes the MTD device is map-based
1134 and that mtd->priv is a valid struct map_info. It should be
1135 replaced with something that uses the mtd_get_unmapped_area()
1136 operation properly. */
1137 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1138#ifdef pgprot_noncached
1139 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1140 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1141#endif
1142 return vm_iomap_memory(vma, map->phys, map->size);
1143 }
1144 return -ENODEV;
1145#else
1146 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1147#endif
1148}
1149
1150static const struct file_operations mtd_fops = {
1151 .owner = THIS_MODULE,
1152 .llseek = mtdchar_lseek,
1153 .read = mtdchar_read,
1154 .write = mtdchar_write,
1155 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1156#ifdef CONFIG_COMPAT
1157 .compat_ioctl = mtdchar_compat_ioctl,
1158#endif
1159 .open = mtdchar_open,
1160 .release = mtdchar_close,
1161 .mmap = mtdchar_mmap,
1162#ifndef CONFIG_MMU
1163 .get_unmapped_area = mtdchar_get_unmapped_area,
1164 .mmap_capabilities = mtdchar_mmap_capabilities,
1165#endif
1166};
1167
1168int __init init_mtdchar(void)
1169{
1170 int ret;
1171
1172 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1173 "mtd", &mtd_fops);
1174 if (ret < 0) {
1175 pr_err("Can't allocate major number %d for MTD\n",
1176 MTD_CHAR_MAJOR);
1177 return ret;
1178 }
1179
1180 return ret;
1181}
1182
1183void __exit cleanup_mtdchar(void)
1184{
1185 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1186}
1187
1188MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1/*
2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 */
19
20#include <linux/device.h>
21#include <linux/fs.h>
22#include <linux/mm.h>
23#include <linux/err.h>
24#include <linux/init.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/sched.h>
29#include <linux/mutex.h>
30#include <linux/backing-dev.h>
31#include <linux/compat.h>
32#include <linux/mount.h>
33#include <linux/blkpg.h>
34#include <linux/magic.h>
35#include <linux/major.h>
36#include <linux/mtd/mtd.h>
37#include <linux/mtd/partitions.h>
38#include <linux/mtd/map.h>
39
40#include <asm/uaccess.h>
41
42#include "mtdcore.h"
43
44static DEFINE_MUTEX(mtd_mutex);
45
46/*
47 * Data structure to hold the pointer to the mtd device as well
48 * as mode information of various use cases.
49 */
50struct mtd_file_info {
51 struct mtd_info *mtd;
52 struct inode *ino;
53 enum mtd_file_modes mode;
54};
55
56static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
57{
58 struct mtd_file_info *mfi = file->private_data;
59 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
60}
61
62static int count;
63static struct vfsmount *mnt;
64static struct file_system_type mtd_inodefs_type;
65
66static int mtdchar_open(struct inode *inode, struct file *file)
67{
68 int minor = iminor(inode);
69 int devnum = minor >> 1;
70 int ret = 0;
71 struct mtd_info *mtd;
72 struct mtd_file_info *mfi;
73 struct inode *mtd_ino;
74
75 pr_debug("MTD_open\n");
76
77 /* You can't open the RO devices RW */
78 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
79 return -EACCES;
80
81 ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count);
82 if (ret)
83 return ret;
84
85 mutex_lock(&mtd_mutex);
86 mtd = get_mtd_device(NULL, devnum);
87
88 if (IS_ERR(mtd)) {
89 ret = PTR_ERR(mtd);
90 goto out;
91 }
92
93 if (mtd->type == MTD_ABSENT) {
94 ret = -ENODEV;
95 goto out1;
96 }
97
98 mtd_ino = iget_locked(mnt->mnt_sb, devnum);
99 if (!mtd_ino) {
100 ret = -ENOMEM;
101 goto out1;
102 }
103 if (mtd_ino->i_state & I_NEW) {
104 mtd_ino->i_private = mtd;
105 mtd_ino->i_mode = S_IFCHR;
106 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
107 unlock_new_inode(mtd_ino);
108 }
109 file->f_mapping = mtd_ino->i_mapping;
110
111 /* You can't open it RW if it's not a writeable device */
112 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
113 ret = -EACCES;
114 goto out2;
115 }
116
117 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
118 if (!mfi) {
119 ret = -ENOMEM;
120 goto out2;
121 }
122 mfi->ino = mtd_ino;
123 mfi->mtd = mtd;
124 file->private_data = mfi;
125 mutex_unlock(&mtd_mutex);
126 return 0;
127
128out2:
129 iput(mtd_ino);
130out1:
131 put_mtd_device(mtd);
132out:
133 mutex_unlock(&mtd_mutex);
134 simple_release_fs(&mnt, &count);
135 return ret;
136} /* mtdchar_open */
137
138/*====================================================================*/
139
140static int mtdchar_close(struct inode *inode, struct file *file)
141{
142 struct mtd_file_info *mfi = file->private_data;
143 struct mtd_info *mtd = mfi->mtd;
144
145 pr_debug("MTD_close\n");
146
147 /* Only sync if opened RW */
148 if ((file->f_mode & FMODE_WRITE))
149 mtd_sync(mtd);
150
151 iput(mfi->ino);
152
153 put_mtd_device(mtd);
154 file->private_data = NULL;
155 kfree(mfi);
156 simple_release_fs(&mnt, &count);
157
158 return 0;
159} /* mtdchar_close */
160
161/* Back in June 2001, dwmw2 wrote:
162 *
163 * FIXME: This _really_ needs to die. In 2.5, we should lock the
164 * userspace buffer down and use it directly with readv/writev.
165 *
166 * The implementation below, using mtd_kmalloc_up_to, mitigates
167 * allocation failures when the system is under low-memory situations
168 * or if memory is highly fragmented at the cost of reducing the
169 * performance of the requested transfer due to a smaller buffer size.
170 *
171 * A more complex but more memory-efficient implementation based on
172 * get_user_pages and iovecs to cover extents of those pages is a
173 * longer-term goal, as intimated by dwmw2 above. However, for the
174 * write case, this requires yet more complex head and tail transfer
175 * handling when those head and tail offsets and sizes are such that
176 * alignment requirements are not met in the NAND subdriver.
177 */
178
179static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
180 loff_t *ppos)
181{
182 struct mtd_file_info *mfi = file->private_data;
183 struct mtd_info *mtd = mfi->mtd;
184 size_t retlen;
185 size_t total_retlen=0;
186 int ret=0;
187 int len;
188 size_t size = count;
189 char *kbuf;
190
191 pr_debug("MTD_read\n");
192
193 if (*ppos + count > mtd->size)
194 count = mtd->size - *ppos;
195
196 if (!count)
197 return 0;
198
199 kbuf = mtd_kmalloc_up_to(mtd, &size);
200 if (!kbuf)
201 return -ENOMEM;
202
203 while (count) {
204 len = min_t(size_t, count, size);
205
206 switch (mfi->mode) {
207 case MTD_FILE_MODE_OTP_FACTORY:
208 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
209 &retlen, kbuf);
210 break;
211 case MTD_FILE_MODE_OTP_USER:
212 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
213 &retlen, kbuf);
214 break;
215 case MTD_FILE_MODE_RAW:
216 {
217 struct mtd_oob_ops ops;
218
219 ops.mode = MTD_OPS_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 occurred 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 || mtd_is_bitflip_or_eccerr(ret)) {
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} /* mtdchar_read */
264
265static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
266 loff_t *ppos)
267{
268 struct mtd_file_info *mfi = file->private_data;
269 struct mtd_info *mtd = mfi->mtd;
270 size_t size = count;
271 char *kbuf;
272 size_t retlen;
273 size_t total_retlen=0;
274 int ret=0;
275 int len;
276
277 pr_debug("MTD_write\n");
278
279 if (*ppos == mtd->size)
280 return -ENOSPC;
281
282 if (*ppos + count > mtd->size)
283 count = mtd->size - *ppos;
284
285 if (!count)
286 return 0;
287
288 kbuf = mtd_kmalloc_up_to(mtd, &size);
289 if (!kbuf)
290 return -ENOMEM;
291
292 while (count) {
293 len = min_t(size_t, count, size);
294
295 if (copy_from_user(kbuf, buf, len)) {
296 kfree(kbuf);
297 return -EFAULT;
298 }
299
300 switch (mfi->mode) {
301 case MTD_FILE_MODE_OTP_FACTORY:
302 ret = -EROFS;
303 break;
304 case MTD_FILE_MODE_OTP_USER:
305 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
306 &retlen, kbuf);
307 break;
308
309 case MTD_FILE_MODE_RAW:
310 {
311 struct mtd_oob_ops ops;
312
313 ops.mode = MTD_OPS_RAW;
314 ops.datbuf = kbuf;
315 ops.oobbuf = NULL;
316 ops.ooboffs = 0;
317 ops.len = len;
318
319 ret = mtd_write_oob(mtd, *ppos, &ops);
320 retlen = ops.retlen;
321 break;
322 }
323
324 default:
325 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
326 }
327
328 /*
329 * Return -ENOSPC only if no data could be written at all.
330 * Otherwise just return the number of bytes that actually
331 * have been written.
332 */
333 if ((ret == -ENOSPC) && (total_retlen))
334 break;
335
336 if (!ret) {
337 *ppos += retlen;
338 total_retlen += retlen;
339 count -= retlen;
340 buf += retlen;
341 }
342 else {
343 kfree(kbuf);
344 return ret;
345 }
346 }
347
348 kfree(kbuf);
349 return total_retlen;
350} /* mtdchar_write */
351
352/*======================================================================
353
354 IOCTL calls for getting device parameters.
355
356======================================================================*/
357static void mtdchar_erase_callback (struct erase_info *instr)
358{
359 wake_up((wait_queue_head_t *)instr->priv);
360}
361
362static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
363{
364 struct mtd_info *mtd = mfi->mtd;
365 size_t retlen;
366
367 switch (mode) {
368 case MTD_OTP_FACTORY:
369 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
370 -EOPNOTSUPP)
371 return -EOPNOTSUPP;
372
373 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
374 break;
375 case MTD_OTP_USER:
376 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
377 -EOPNOTSUPP)
378 return -EOPNOTSUPP;
379
380 mfi->mode = MTD_FILE_MODE_OTP_USER;
381 break;
382 case MTD_OTP_OFF:
383 mfi->mode = MTD_FILE_MODE_NORMAL;
384 break;
385 default:
386 return -EINVAL;
387 }
388
389 return 0;
390}
391
392static int mtdchar_writeoob(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 uint32_t retlen;
399 int ret = 0;
400
401 if (!(file->f_mode & FMODE_WRITE))
402 return -EPERM;
403
404 if (length > 4096)
405 return -EINVAL;
406
407 if (!mtd->_write_oob)
408 ret = -EOPNOTSUPP;
409 else
410 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
411
412 if (ret)
413 return ret;
414
415 ops.ooblen = length;
416 ops.ooboffs = start & (mtd->writesize - 1);
417 ops.datbuf = NULL;
418 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
419 MTD_OPS_PLACE_OOB;
420
421 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
422 return -EINVAL;
423
424 ops.oobbuf = memdup_user(ptr, length);
425 if (IS_ERR(ops.oobbuf))
426 return PTR_ERR(ops.oobbuf);
427
428 start &= ~((uint64_t)mtd->writesize - 1);
429 ret = mtd_write_oob(mtd, start, &ops);
430
431 if (ops.oobretlen > 0xFFFFFFFFU)
432 ret = -EOVERFLOW;
433 retlen = ops.oobretlen;
434 if (copy_to_user(retp, &retlen, sizeof(length)))
435 ret = -EFAULT;
436
437 kfree(ops.oobbuf);
438 return ret;
439}
440
441static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
442 uint64_t start, uint32_t length, void __user *ptr,
443 uint32_t __user *retp)
444{
445 struct mtd_file_info *mfi = file->private_data;
446 struct mtd_oob_ops ops;
447 int ret = 0;
448
449 if (length > 4096)
450 return -EINVAL;
451
452 if (!access_ok(VERIFY_WRITE, ptr, length))
453 return -EFAULT;
454
455 ops.ooblen = length;
456 ops.ooboffs = start & (mtd->writesize - 1);
457 ops.datbuf = NULL;
458 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
459 MTD_OPS_PLACE_OOB;
460
461 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
462 return -EINVAL;
463
464 ops.oobbuf = kmalloc(length, GFP_KERNEL);
465 if (!ops.oobbuf)
466 return -ENOMEM;
467
468 start &= ~((uint64_t)mtd->writesize - 1);
469 ret = mtd_read_oob(mtd, start, &ops);
470
471 if (put_user(ops.oobretlen, retp))
472 ret = -EFAULT;
473 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
474 ops.oobretlen))
475 ret = -EFAULT;
476
477 kfree(ops.oobbuf);
478
479 /*
480 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
481 * data. For our userspace tools it is important to dump areas
482 * with ECC errors!
483 * For kernel internal usage it also might return -EUCLEAN
484 * to signal the caller that a bitflip has occured and has
485 * been corrected by the ECC algorithm.
486 *
487 * Note: currently the standard NAND function, nand_read_oob_std,
488 * does not calculate ECC for the OOB area, so do not rely on
489 * this behavior unless you have replaced it with your own.
490 */
491 if (mtd_is_bitflip_or_eccerr(ret))
492 return 0;
493
494 return ret;
495}
496
497/*
498 * Copies (and truncates, if necessary) data from the larger struct,
499 * nand_ecclayout, to the smaller, deprecated layout struct,
500 * nand_ecclayout_user. This is necessary only to support the deprecated
501 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
502 * nand_ecclayout flexibly (i.e. the struct may change size in new
503 * releases without requiring major rewrites).
504 */
505static int shrink_ecclayout(const struct nand_ecclayout *from,
506 struct nand_ecclayout_user *to)
507{
508 int i;
509
510 if (!from || !to)
511 return -EINVAL;
512
513 memset(to, 0, sizeof(*to));
514
515 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
516 for (i = 0; i < to->eccbytes; i++)
517 to->eccpos[i] = from->eccpos[i];
518
519 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
520 if (from->oobfree[i].length == 0 &&
521 from->oobfree[i].offset == 0)
522 break;
523 to->oobavail += from->oobfree[i].length;
524 to->oobfree[i] = from->oobfree[i];
525 }
526
527 return 0;
528}
529
530static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
531 struct blkpg_ioctl_arg __user *arg)
532{
533 struct blkpg_ioctl_arg a;
534 struct blkpg_partition p;
535
536 if (!capable(CAP_SYS_ADMIN))
537 return -EPERM;
538
539 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
540 return -EFAULT;
541
542 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
543 return -EFAULT;
544
545 switch (a.op) {
546 case BLKPG_ADD_PARTITION:
547
548 /* Only master mtd device must be used to add partitions */
549 if (mtd_is_partition(mtd))
550 return -EINVAL;
551
552 return mtd_add_partition(mtd, p.devname, p.start, p.length);
553
554 case BLKPG_DEL_PARTITION:
555
556 if (p.pno < 0)
557 return -EINVAL;
558
559 return mtd_del_partition(mtd, p.pno);
560
561 default:
562 return -EINVAL;
563 }
564}
565
566static int mtdchar_write_ioctl(struct mtd_info *mtd,
567 struct mtd_write_req __user *argp)
568{
569 struct mtd_write_req req;
570 struct mtd_oob_ops ops;
571 void __user *usr_data, *usr_oob;
572 int ret;
573
574 if (copy_from_user(&req, argp, sizeof(req)) ||
575 !access_ok(VERIFY_READ, req.usr_data, req.len) ||
576 !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
577 return -EFAULT;
578 if (!mtd->_write_oob)
579 return -EOPNOTSUPP;
580
581 ops.mode = req.mode;
582 ops.len = (size_t)req.len;
583 ops.ooblen = (size_t)req.ooblen;
584 ops.ooboffs = 0;
585
586 usr_data = (void __user *)(uintptr_t)req.usr_data;
587 usr_oob = (void __user *)(uintptr_t)req.usr_oob;
588
589 if (req.usr_data) {
590 ops.datbuf = memdup_user(usr_data, ops.len);
591 if (IS_ERR(ops.datbuf))
592 return PTR_ERR(ops.datbuf);
593 } else {
594 ops.datbuf = NULL;
595 }
596
597 if (req.usr_oob) {
598 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
599 if (IS_ERR(ops.oobbuf)) {
600 kfree(ops.datbuf);
601 return PTR_ERR(ops.oobbuf);
602 }
603 } else {
604 ops.oobbuf = NULL;
605 }
606
607 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
608
609 kfree(ops.datbuf);
610 kfree(ops.oobbuf);
611
612 return ret;
613}
614
615static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
616{
617 struct mtd_file_info *mfi = file->private_data;
618 struct mtd_info *mtd = mfi->mtd;
619 void __user *argp = (void __user *)arg;
620 int ret = 0;
621 u_long size;
622 struct mtd_info_user info;
623
624 pr_debug("MTD_ioctl\n");
625
626 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
627 if (cmd & IOC_IN) {
628 if (!access_ok(VERIFY_READ, argp, size))
629 return -EFAULT;
630 }
631 if (cmd & IOC_OUT) {
632 if (!access_ok(VERIFY_WRITE, argp, size))
633 return -EFAULT;
634 }
635
636 switch (cmd) {
637 case MEMGETREGIONCOUNT:
638 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
639 return -EFAULT;
640 break;
641
642 case MEMGETREGIONINFO:
643 {
644 uint32_t ur_idx;
645 struct mtd_erase_region_info *kr;
646 struct region_info_user __user *ur = argp;
647
648 if (get_user(ur_idx, &(ur->regionindex)))
649 return -EFAULT;
650
651 if (ur_idx >= mtd->numeraseregions)
652 return -EINVAL;
653
654 kr = &(mtd->eraseregions[ur_idx]);
655
656 if (put_user(kr->offset, &(ur->offset))
657 || put_user(kr->erasesize, &(ur->erasesize))
658 || put_user(kr->numblocks, &(ur->numblocks)))
659 return -EFAULT;
660
661 break;
662 }
663
664 case MEMGETINFO:
665 memset(&info, 0, sizeof(info));
666 info.type = mtd->type;
667 info.flags = mtd->flags;
668 info.size = mtd->size;
669 info.erasesize = mtd->erasesize;
670 info.writesize = mtd->writesize;
671 info.oobsize = mtd->oobsize;
672 /* The below field is obsolete */
673 info.padding = 0;
674 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
675 return -EFAULT;
676 break;
677
678 case MEMERASE:
679 case MEMERASE64:
680 {
681 struct erase_info *erase;
682
683 if(!(file->f_mode & FMODE_WRITE))
684 return -EPERM;
685
686 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
687 if (!erase)
688 ret = -ENOMEM;
689 else {
690 wait_queue_head_t waitq;
691 DECLARE_WAITQUEUE(wait, current);
692
693 init_waitqueue_head(&waitq);
694
695 if (cmd == MEMERASE64) {
696 struct erase_info_user64 einfo64;
697
698 if (copy_from_user(&einfo64, argp,
699 sizeof(struct erase_info_user64))) {
700 kfree(erase);
701 return -EFAULT;
702 }
703 erase->addr = einfo64.start;
704 erase->len = einfo64.length;
705 } else {
706 struct erase_info_user einfo32;
707
708 if (copy_from_user(&einfo32, argp,
709 sizeof(struct erase_info_user))) {
710 kfree(erase);
711 return -EFAULT;
712 }
713 erase->addr = einfo32.start;
714 erase->len = einfo32.length;
715 }
716 erase->mtd = mtd;
717 erase->callback = mtdchar_erase_callback;
718 erase->priv = (unsigned long)&waitq;
719
720 /*
721 FIXME: Allow INTERRUPTIBLE. Which means
722 not having the wait_queue head on the stack.
723
724 If the wq_head is on the stack, and we
725 leave because we got interrupted, then the
726 wq_head is no longer there when the
727 callback routine tries to wake us up.
728 */
729 ret = mtd_erase(mtd, erase);
730 if (!ret) {
731 set_current_state(TASK_UNINTERRUPTIBLE);
732 add_wait_queue(&waitq, &wait);
733 if (erase->state != MTD_ERASE_DONE &&
734 erase->state != MTD_ERASE_FAILED)
735 schedule();
736 remove_wait_queue(&waitq, &wait);
737 set_current_state(TASK_RUNNING);
738
739 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
740 }
741 kfree(erase);
742 }
743 break;
744 }
745
746 case MEMWRITEOOB:
747 {
748 struct mtd_oob_buf buf;
749 struct mtd_oob_buf __user *buf_user = argp;
750
751 /* NOTE: writes return length to buf_user->length */
752 if (copy_from_user(&buf, argp, sizeof(buf)))
753 ret = -EFAULT;
754 else
755 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
756 buf.ptr, &buf_user->length);
757 break;
758 }
759
760 case MEMREADOOB:
761 {
762 struct mtd_oob_buf buf;
763 struct mtd_oob_buf __user *buf_user = argp;
764
765 /* NOTE: writes return length to buf_user->start */
766 if (copy_from_user(&buf, argp, sizeof(buf)))
767 ret = -EFAULT;
768 else
769 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
770 buf.ptr, &buf_user->start);
771 break;
772 }
773
774 case MEMWRITEOOB64:
775 {
776 struct mtd_oob_buf64 buf;
777 struct mtd_oob_buf64 __user *buf_user = argp;
778
779 if (copy_from_user(&buf, argp, sizeof(buf)))
780 ret = -EFAULT;
781 else
782 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
783 (void __user *)(uintptr_t)buf.usr_ptr,
784 &buf_user->length);
785 break;
786 }
787
788 case MEMREADOOB64:
789 {
790 struct mtd_oob_buf64 buf;
791 struct mtd_oob_buf64 __user *buf_user = argp;
792
793 if (copy_from_user(&buf, argp, sizeof(buf)))
794 ret = -EFAULT;
795 else
796 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
797 (void __user *)(uintptr_t)buf.usr_ptr,
798 &buf_user->length);
799 break;
800 }
801
802 case MEMWRITE:
803 {
804 ret = mtdchar_write_ioctl(mtd,
805 (struct mtd_write_req __user *)arg);
806 break;
807 }
808
809 case MEMLOCK:
810 {
811 struct erase_info_user einfo;
812
813 if (copy_from_user(&einfo, argp, sizeof(einfo)))
814 return -EFAULT;
815
816 ret = mtd_lock(mtd, einfo.start, einfo.length);
817 break;
818 }
819
820 case MEMUNLOCK:
821 {
822 struct erase_info_user einfo;
823
824 if (copy_from_user(&einfo, argp, sizeof(einfo)))
825 return -EFAULT;
826
827 ret = mtd_unlock(mtd, einfo.start, einfo.length);
828 break;
829 }
830
831 case MEMISLOCKED:
832 {
833 struct erase_info_user einfo;
834
835 if (copy_from_user(&einfo, argp, sizeof(einfo)))
836 return -EFAULT;
837
838 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
839 break;
840 }
841
842 /* Legacy interface */
843 case MEMGETOOBSEL:
844 {
845 struct nand_oobinfo oi;
846
847 if (!mtd->ecclayout)
848 return -EOPNOTSUPP;
849 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
850 return -EINVAL;
851
852 oi.useecc = MTD_NANDECC_AUTOPLACE;
853 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
854 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
855 sizeof(oi.oobfree));
856 oi.eccbytes = mtd->ecclayout->eccbytes;
857
858 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
859 return -EFAULT;
860 break;
861 }
862
863 case MEMGETBADBLOCK:
864 {
865 loff_t offs;
866
867 if (copy_from_user(&offs, argp, sizeof(loff_t)))
868 return -EFAULT;
869 return mtd_block_isbad(mtd, offs);
870 break;
871 }
872
873 case MEMSETBADBLOCK:
874 {
875 loff_t offs;
876
877 if (copy_from_user(&offs, argp, sizeof(loff_t)))
878 return -EFAULT;
879 return mtd_block_markbad(mtd, offs);
880 break;
881 }
882
883 case OTPSELECT:
884 {
885 int mode;
886 if (copy_from_user(&mode, argp, sizeof(int)))
887 return -EFAULT;
888
889 mfi->mode = MTD_FILE_MODE_NORMAL;
890
891 ret = otp_select_filemode(mfi, mode);
892
893 file->f_pos = 0;
894 break;
895 }
896
897 case OTPGETREGIONCOUNT:
898 case OTPGETREGIONINFO:
899 {
900 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
901 size_t retlen;
902 if (!buf)
903 return -ENOMEM;
904 switch (mfi->mode) {
905 case MTD_FILE_MODE_OTP_FACTORY:
906 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
907 break;
908 case MTD_FILE_MODE_OTP_USER:
909 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
910 break;
911 default:
912 ret = -EINVAL;
913 break;
914 }
915 if (!ret) {
916 if (cmd == OTPGETREGIONCOUNT) {
917 int nbr = retlen / sizeof(struct otp_info);
918 ret = copy_to_user(argp, &nbr, sizeof(int));
919 } else
920 ret = copy_to_user(argp, buf, retlen);
921 if (ret)
922 ret = -EFAULT;
923 }
924 kfree(buf);
925 break;
926 }
927
928 case OTPLOCK:
929 {
930 struct otp_info oinfo;
931
932 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
933 return -EINVAL;
934 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
935 return -EFAULT;
936 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
937 break;
938 }
939
940 /* This ioctl is being deprecated - it truncates the ECC layout */
941 case ECCGETLAYOUT:
942 {
943 struct nand_ecclayout_user *usrlay;
944
945 if (!mtd->ecclayout)
946 return -EOPNOTSUPP;
947
948 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
949 if (!usrlay)
950 return -ENOMEM;
951
952 shrink_ecclayout(mtd->ecclayout, usrlay);
953
954 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
955 ret = -EFAULT;
956 kfree(usrlay);
957 break;
958 }
959
960 case ECCGETSTATS:
961 {
962 if (copy_to_user(argp, &mtd->ecc_stats,
963 sizeof(struct mtd_ecc_stats)))
964 return -EFAULT;
965 break;
966 }
967
968 case MTDFILEMODE:
969 {
970 mfi->mode = 0;
971
972 switch(arg) {
973 case MTD_FILE_MODE_OTP_FACTORY:
974 case MTD_FILE_MODE_OTP_USER:
975 ret = otp_select_filemode(mfi, arg);
976 break;
977
978 case MTD_FILE_MODE_RAW:
979 if (!mtd_has_oob(mtd))
980 return -EOPNOTSUPP;
981 mfi->mode = arg;
982
983 case MTD_FILE_MODE_NORMAL:
984 break;
985 default:
986 ret = -EINVAL;
987 }
988 file->f_pos = 0;
989 break;
990 }
991
992 case BLKPG:
993 {
994 ret = mtdchar_blkpg_ioctl(mtd,
995 (struct blkpg_ioctl_arg __user *)arg);
996 break;
997 }
998
999 case BLKRRPART:
1000 {
1001 /* No reread partition feature. Just return ok */
1002 ret = 0;
1003 break;
1004 }
1005
1006 default:
1007 ret = -ENOTTY;
1008 }
1009
1010 return ret;
1011} /* memory_ioctl */
1012
1013static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1014{
1015 int ret;
1016
1017 mutex_lock(&mtd_mutex);
1018 ret = mtdchar_ioctl(file, cmd, arg);
1019 mutex_unlock(&mtd_mutex);
1020
1021 return ret;
1022}
1023
1024#ifdef CONFIG_COMPAT
1025
1026struct mtd_oob_buf32 {
1027 u_int32_t start;
1028 u_int32_t length;
1029 compat_caddr_t ptr; /* unsigned char* */
1030};
1031
1032#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1033#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1034
1035static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1036 unsigned long arg)
1037{
1038 struct mtd_file_info *mfi = file->private_data;
1039 struct mtd_info *mtd = mfi->mtd;
1040 void __user *argp = compat_ptr(arg);
1041 int ret = 0;
1042
1043 mutex_lock(&mtd_mutex);
1044
1045 switch (cmd) {
1046 case MEMWRITEOOB32:
1047 {
1048 struct mtd_oob_buf32 buf;
1049 struct mtd_oob_buf32 __user *buf_user = argp;
1050
1051 if (copy_from_user(&buf, argp, sizeof(buf)))
1052 ret = -EFAULT;
1053 else
1054 ret = mtdchar_writeoob(file, mtd, buf.start,
1055 buf.length, compat_ptr(buf.ptr),
1056 &buf_user->length);
1057 break;
1058 }
1059
1060 case MEMREADOOB32:
1061 {
1062 struct mtd_oob_buf32 buf;
1063 struct mtd_oob_buf32 __user *buf_user = argp;
1064
1065 /* NOTE: writes return length to buf->start */
1066 if (copy_from_user(&buf, argp, sizeof(buf)))
1067 ret = -EFAULT;
1068 else
1069 ret = mtdchar_readoob(file, mtd, buf.start,
1070 buf.length, compat_ptr(buf.ptr),
1071 &buf_user->start);
1072 break;
1073 }
1074 default:
1075 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1076 }
1077
1078 mutex_unlock(&mtd_mutex);
1079
1080 return ret;
1081}
1082
1083#endif /* CONFIG_COMPAT */
1084
1085/*
1086 * try to determine where a shared mapping can be made
1087 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1088 * mappings)
1089 */
1090#ifndef CONFIG_MMU
1091static unsigned long mtdchar_get_unmapped_area(struct file *file,
1092 unsigned long addr,
1093 unsigned long len,
1094 unsigned long pgoff,
1095 unsigned long flags)
1096{
1097 struct mtd_file_info *mfi = file->private_data;
1098 struct mtd_info *mtd = mfi->mtd;
1099 unsigned long offset;
1100 int ret;
1101
1102 if (addr != 0)
1103 return (unsigned long) -EINVAL;
1104
1105 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1106 return (unsigned long) -EINVAL;
1107
1108 offset = pgoff << PAGE_SHIFT;
1109 if (offset > mtd->size - len)
1110 return (unsigned long) -EINVAL;
1111
1112 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1113 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1114}
1115#endif
1116
1117/*
1118 * set up a mapping for shared memory segments
1119 */
1120static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1121{
1122#ifdef CONFIG_MMU
1123 struct mtd_file_info *mfi = file->private_data;
1124 struct mtd_info *mtd = mfi->mtd;
1125 struct map_info *map = mtd->priv;
1126
1127 /* This is broken because it assumes the MTD device is map-based
1128 and that mtd->priv is a valid struct map_info. It should be
1129 replaced with something that uses the mtd_get_unmapped_area()
1130 operation properly. */
1131 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1132#ifdef pgprot_noncached
1133 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1134 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1135#endif
1136 return vm_iomap_memory(vma, map->phys, map->size);
1137 }
1138 return -ENODEV;
1139#else
1140 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1141#endif
1142}
1143
1144static const struct file_operations mtd_fops = {
1145 .owner = THIS_MODULE,
1146 .llseek = mtdchar_lseek,
1147 .read = mtdchar_read,
1148 .write = mtdchar_write,
1149 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1150#ifdef CONFIG_COMPAT
1151 .compat_ioctl = mtdchar_compat_ioctl,
1152#endif
1153 .open = mtdchar_open,
1154 .release = mtdchar_close,
1155 .mmap = mtdchar_mmap,
1156#ifndef CONFIG_MMU
1157 .get_unmapped_area = mtdchar_get_unmapped_area,
1158#endif
1159};
1160
1161static const struct super_operations mtd_ops = {
1162 .drop_inode = generic_delete_inode,
1163 .statfs = simple_statfs,
1164};
1165
1166static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1167 int flags, const char *dev_name, void *data)
1168{
1169 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
1170}
1171
1172static struct file_system_type mtd_inodefs_type = {
1173 .name = "mtd_inodefs",
1174 .mount = mtd_inodefs_mount,
1175 .kill_sb = kill_anon_super,
1176};
1177MODULE_ALIAS_FS("mtd_inodefs");
1178
1179int __init init_mtdchar(void)
1180{
1181 int ret;
1182
1183 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1184 "mtd", &mtd_fops);
1185 if (ret < 0) {
1186 pr_err("Can't allocate major number %d for MTD\n",
1187 MTD_CHAR_MAJOR);
1188 return ret;
1189 }
1190
1191 ret = register_filesystem(&mtd_inodefs_type);
1192 if (ret) {
1193 pr_err("Can't register mtd_inodefs filesystem, error %d\n",
1194 ret);
1195 goto err_unregister_chdev;
1196 }
1197
1198 return ret;
1199
1200err_unregister_chdev:
1201 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1202 return ret;
1203}
1204
1205void __exit cleanup_mtdchar(void)
1206{
1207 unregister_filesystem(&mtd_inodefs_type);
1208 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1209}
1210
1211MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);