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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 <linux/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======================================================================*/
327
328static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
329{
330 struct mtd_info *mtd = mfi->mtd;
331 size_t retlen;
332
333 switch (mode) {
334 case MTD_OTP_FACTORY:
335 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
336 -EOPNOTSUPP)
337 return -EOPNOTSUPP;
338
339 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
340 break;
341 case MTD_OTP_USER:
342 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
343 -EOPNOTSUPP)
344 return -EOPNOTSUPP;
345
346 mfi->mode = MTD_FILE_MODE_OTP_USER;
347 break;
348 case MTD_OTP_OFF:
349 mfi->mode = MTD_FILE_MODE_NORMAL;
350 break;
351 default:
352 return -EINVAL;
353 }
354
355 return 0;
356}
357
358static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
359 uint64_t start, uint32_t length, void __user *ptr,
360 uint32_t __user *retp)
361{
362 struct mtd_file_info *mfi = file->private_data;
363 struct mtd_oob_ops ops;
364 uint32_t retlen;
365 int ret = 0;
366
367 if (!(file->f_mode & FMODE_WRITE))
368 return -EPERM;
369
370 if (length > 4096)
371 return -EINVAL;
372
373 if (!mtd->_write_oob)
374 return -EOPNOTSUPP;
375
376 ops.ooblen = length;
377 ops.ooboffs = start & (mtd->writesize - 1);
378 ops.datbuf = NULL;
379 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
380 MTD_OPS_PLACE_OOB;
381
382 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
383 return -EINVAL;
384
385 ops.oobbuf = memdup_user(ptr, length);
386 if (IS_ERR(ops.oobbuf))
387 return PTR_ERR(ops.oobbuf);
388
389 start &= ~((uint64_t)mtd->writesize - 1);
390 ret = mtd_write_oob(mtd, start, &ops);
391
392 if (ops.oobretlen > 0xFFFFFFFFU)
393 ret = -EOVERFLOW;
394 retlen = ops.oobretlen;
395 if (copy_to_user(retp, &retlen, sizeof(length)))
396 ret = -EFAULT;
397
398 kfree(ops.oobbuf);
399 return ret;
400}
401
402static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
403 uint64_t start, uint32_t length, void __user *ptr,
404 uint32_t __user *retp)
405{
406 struct mtd_file_info *mfi = file->private_data;
407 struct mtd_oob_ops ops;
408 int ret = 0;
409
410 if (length > 4096)
411 return -EINVAL;
412
413 ops.ooblen = length;
414 ops.ooboffs = start & (mtd->writesize - 1);
415 ops.datbuf = NULL;
416 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
417 MTD_OPS_PLACE_OOB;
418
419 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
420 return -EINVAL;
421
422 ops.oobbuf = kmalloc(length, GFP_KERNEL);
423 if (!ops.oobbuf)
424 return -ENOMEM;
425
426 start &= ~((uint64_t)mtd->writesize - 1);
427 ret = mtd_read_oob(mtd, start, &ops);
428
429 if (put_user(ops.oobretlen, retp))
430 ret = -EFAULT;
431 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
432 ops.oobretlen))
433 ret = -EFAULT;
434
435 kfree(ops.oobbuf);
436
437 /*
438 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
439 * data. For our userspace tools it is important to dump areas
440 * with ECC errors!
441 * For kernel internal usage it also might return -EUCLEAN
442 * to signal the caller that a bitflip has occurred and has
443 * been corrected by the ECC algorithm.
444 *
445 * Note: currently the standard NAND function, nand_read_oob_std,
446 * does not calculate ECC for the OOB area, so do not rely on
447 * this behavior unless you have replaced it with your own.
448 */
449 if (mtd_is_bitflip_or_eccerr(ret))
450 return 0;
451
452 return ret;
453}
454
455/*
456 * Copies (and truncates, if necessary) OOB layout information to the
457 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
458 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
459 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
460 * can describe any kind of OOB layout with almost zero overhead from a
461 * memory usage point of view).
462 */
463static int shrink_ecclayout(struct mtd_info *mtd,
464 struct nand_ecclayout_user *to)
465{
466 struct mtd_oob_region oobregion;
467 int i, section = 0, ret;
468
469 if (!mtd || !to)
470 return -EINVAL;
471
472 memset(to, 0, sizeof(*to));
473
474 to->eccbytes = 0;
475 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
476 u32 eccpos;
477
478 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
479 if (ret < 0) {
480 if (ret != -ERANGE)
481 return ret;
482
483 break;
484 }
485
486 eccpos = oobregion.offset;
487 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
488 eccpos < oobregion.offset + oobregion.length; i++) {
489 to->eccpos[i] = eccpos++;
490 to->eccbytes++;
491 }
492 }
493
494 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
495 ret = mtd_ooblayout_free(mtd, i, &oobregion);
496 if (ret < 0) {
497 if (ret != -ERANGE)
498 return ret;
499
500 break;
501 }
502
503 to->oobfree[i].offset = oobregion.offset;
504 to->oobfree[i].length = oobregion.length;
505 to->oobavail += to->oobfree[i].length;
506 }
507
508 return 0;
509}
510
511static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
512{
513 struct mtd_oob_region oobregion;
514 int i, section = 0, ret;
515
516 if (!mtd || !to)
517 return -EINVAL;
518
519 memset(to, 0, sizeof(*to));
520
521 to->eccbytes = 0;
522 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
523 u32 eccpos;
524
525 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
526 if (ret < 0) {
527 if (ret != -ERANGE)
528 return ret;
529
530 break;
531 }
532
533 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
534 return -EINVAL;
535
536 eccpos = oobregion.offset;
537 for (; eccpos < oobregion.offset + oobregion.length; i++) {
538 to->eccpos[i] = eccpos++;
539 to->eccbytes++;
540 }
541 }
542
543 for (i = 0; i < 8; i++) {
544 ret = mtd_ooblayout_free(mtd, i, &oobregion);
545 if (ret < 0) {
546 if (ret != -ERANGE)
547 return ret;
548
549 break;
550 }
551
552 to->oobfree[i][0] = oobregion.offset;
553 to->oobfree[i][1] = oobregion.length;
554 }
555
556 to->useecc = MTD_NANDECC_AUTOPLACE;
557
558 return 0;
559}
560
561static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
562 struct blkpg_ioctl_arg *arg)
563{
564 struct blkpg_partition p;
565
566 if (!capable(CAP_SYS_ADMIN))
567 return -EPERM;
568
569 if (copy_from_user(&p, arg->data, sizeof(p)))
570 return -EFAULT;
571
572 switch (arg->op) {
573 case BLKPG_ADD_PARTITION:
574
575 /* Only master mtd device must be used to add partitions */
576 if (mtd_is_partition(mtd))
577 return -EINVAL;
578
579 /* Sanitize user input */
580 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
581
582 return mtd_add_partition(mtd, p.devname, p.start, p.length);
583
584 case BLKPG_DEL_PARTITION:
585
586 if (p.pno < 0)
587 return -EINVAL;
588
589 return mtd_del_partition(mtd, p.pno);
590
591 default:
592 return -EINVAL;
593 }
594}
595
596static int mtdchar_write_ioctl(struct mtd_info *mtd,
597 struct mtd_write_req __user *argp)
598{
599 struct mtd_write_req req;
600 struct mtd_oob_ops ops;
601 const void __user *usr_data, *usr_oob;
602 int ret;
603
604 if (copy_from_user(&req, argp, sizeof(req)))
605 return -EFAULT;
606
607 usr_data = (const void __user *)(uintptr_t)req.usr_data;
608 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
609
610 if (!mtd->_write_oob)
611 return -EOPNOTSUPP;
612
613 ops.mode = req.mode;
614 ops.len = (size_t)req.len;
615 ops.ooblen = (size_t)req.ooblen;
616 ops.ooboffs = 0;
617
618 if (usr_data) {
619 ops.datbuf = memdup_user(usr_data, ops.len);
620 if (IS_ERR(ops.datbuf))
621 return PTR_ERR(ops.datbuf);
622 } else {
623 ops.datbuf = NULL;
624 }
625
626 if (usr_oob) {
627 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
628 if (IS_ERR(ops.oobbuf)) {
629 kfree(ops.datbuf);
630 return PTR_ERR(ops.oobbuf);
631 }
632 } else {
633 ops.oobbuf = NULL;
634 }
635
636 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
637
638 kfree(ops.datbuf);
639 kfree(ops.oobbuf);
640
641 return ret;
642}
643
644static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
645{
646 struct mtd_file_info *mfi = file->private_data;
647 struct mtd_info *mtd = mfi->mtd;
648 void __user *argp = (void __user *)arg;
649 int ret = 0;
650 struct mtd_info_user info;
651
652 pr_debug("MTD_ioctl\n");
653
654 switch (cmd) {
655 case MEMGETREGIONCOUNT:
656 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
657 return -EFAULT;
658 break;
659
660 case MEMGETREGIONINFO:
661 {
662 uint32_t ur_idx;
663 struct mtd_erase_region_info *kr;
664 struct region_info_user __user *ur = argp;
665
666 if (get_user(ur_idx, &(ur->regionindex)))
667 return -EFAULT;
668
669 if (ur_idx >= mtd->numeraseregions)
670 return -EINVAL;
671
672 kr = &(mtd->eraseregions[ur_idx]);
673
674 if (put_user(kr->offset, &(ur->offset))
675 || put_user(kr->erasesize, &(ur->erasesize))
676 || put_user(kr->numblocks, &(ur->numblocks)))
677 return -EFAULT;
678
679 break;
680 }
681
682 case MEMGETINFO:
683 memset(&info, 0, sizeof(info));
684 info.type = mtd->type;
685 info.flags = mtd->flags;
686 info.size = mtd->size;
687 info.erasesize = mtd->erasesize;
688 info.writesize = mtd->writesize;
689 info.oobsize = mtd->oobsize;
690 /* The below field is obsolete */
691 info.padding = 0;
692 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
693 return -EFAULT;
694 break;
695
696 case MEMERASE:
697 case MEMERASE64:
698 {
699 struct erase_info *erase;
700
701 if(!(file->f_mode & FMODE_WRITE))
702 return -EPERM;
703
704 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
705 if (!erase)
706 ret = -ENOMEM;
707 else {
708 if (cmd == MEMERASE64) {
709 struct erase_info_user64 einfo64;
710
711 if (copy_from_user(&einfo64, argp,
712 sizeof(struct erase_info_user64))) {
713 kfree(erase);
714 return -EFAULT;
715 }
716 erase->addr = einfo64.start;
717 erase->len = einfo64.length;
718 } else {
719 struct erase_info_user einfo32;
720
721 if (copy_from_user(&einfo32, argp,
722 sizeof(struct erase_info_user))) {
723 kfree(erase);
724 return -EFAULT;
725 }
726 erase->addr = einfo32.start;
727 erase->len = einfo32.length;
728 }
729
730 ret = mtd_erase(mtd, erase);
731 kfree(erase);
732 }
733 break;
734 }
735
736 case MEMWRITEOOB:
737 {
738 struct mtd_oob_buf buf;
739 struct mtd_oob_buf __user *buf_user = argp;
740
741 /* NOTE: writes return length to buf_user->length */
742 if (copy_from_user(&buf, argp, sizeof(buf)))
743 ret = -EFAULT;
744 else
745 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
746 buf.ptr, &buf_user->length);
747 break;
748 }
749
750 case MEMREADOOB:
751 {
752 struct mtd_oob_buf buf;
753 struct mtd_oob_buf __user *buf_user = argp;
754
755 /* NOTE: writes return length to buf_user->start */
756 if (copy_from_user(&buf, argp, sizeof(buf)))
757 ret = -EFAULT;
758 else
759 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
760 buf.ptr, &buf_user->start);
761 break;
762 }
763
764 case MEMWRITEOOB64:
765 {
766 struct mtd_oob_buf64 buf;
767 struct mtd_oob_buf64 __user *buf_user = argp;
768
769 if (copy_from_user(&buf, argp, sizeof(buf)))
770 ret = -EFAULT;
771 else
772 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
773 (void __user *)(uintptr_t)buf.usr_ptr,
774 &buf_user->length);
775 break;
776 }
777
778 case MEMREADOOB64:
779 {
780 struct mtd_oob_buf64 buf;
781 struct mtd_oob_buf64 __user *buf_user = argp;
782
783 if (copy_from_user(&buf, argp, sizeof(buf)))
784 ret = -EFAULT;
785 else
786 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
787 (void __user *)(uintptr_t)buf.usr_ptr,
788 &buf_user->length);
789 break;
790 }
791
792 case MEMWRITE:
793 {
794 ret = mtdchar_write_ioctl(mtd,
795 (struct mtd_write_req __user *)arg);
796 break;
797 }
798
799 case MEMLOCK:
800 {
801 struct erase_info_user einfo;
802
803 if (copy_from_user(&einfo, argp, sizeof(einfo)))
804 return -EFAULT;
805
806 ret = mtd_lock(mtd, einfo.start, einfo.length);
807 break;
808 }
809
810 case MEMUNLOCK:
811 {
812 struct erase_info_user einfo;
813
814 if (copy_from_user(&einfo, argp, sizeof(einfo)))
815 return -EFAULT;
816
817 ret = mtd_unlock(mtd, einfo.start, einfo.length);
818 break;
819 }
820
821 case MEMISLOCKED:
822 {
823 struct erase_info_user einfo;
824
825 if (copy_from_user(&einfo, argp, sizeof(einfo)))
826 return -EFAULT;
827
828 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
829 break;
830 }
831
832 /* Legacy interface */
833 case MEMGETOOBSEL:
834 {
835 struct nand_oobinfo oi;
836
837 if (!mtd->ooblayout)
838 return -EOPNOTSUPP;
839
840 ret = get_oobinfo(mtd, &oi);
841 if (ret)
842 return ret;
843
844 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
845 return -EFAULT;
846 break;
847 }
848
849 case MEMGETBADBLOCK:
850 {
851 loff_t offs;
852
853 if (copy_from_user(&offs, argp, sizeof(loff_t)))
854 return -EFAULT;
855 return mtd_block_isbad(mtd, offs);
856 break;
857 }
858
859 case MEMSETBADBLOCK:
860 {
861 loff_t offs;
862
863 if (copy_from_user(&offs, argp, sizeof(loff_t)))
864 return -EFAULT;
865 return mtd_block_markbad(mtd, offs);
866 break;
867 }
868
869 case OTPSELECT:
870 {
871 int mode;
872 if (copy_from_user(&mode, argp, sizeof(int)))
873 return -EFAULT;
874
875 mfi->mode = MTD_FILE_MODE_NORMAL;
876
877 ret = otp_select_filemode(mfi, mode);
878
879 file->f_pos = 0;
880 break;
881 }
882
883 case OTPGETREGIONCOUNT:
884 case OTPGETREGIONINFO:
885 {
886 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
887 size_t retlen;
888 if (!buf)
889 return -ENOMEM;
890 switch (mfi->mode) {
891 case MTD_FILE_MODE_OTP_FACTORY:
892 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
893 break;
894 case MTD_FILE_MODE_OTP_USER:
895 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
896 break;
897 default:
898 ret = -EINVAL;
899 break;
900 }
901 if (!ret) {
902 if (cmd == OTPGETREGIONCOUNT) {
903 int nbr = retlen / sizeof(struct otp_info);
904 ret = copy_to_user(argp, &nbr, sizeof(int));
905 } else
906 ret = copy_to_user(argp, buf, retlen);
907 if (ret)
908 ret = -EFAULT;
909 }
910 kfree(buf);
911 break;
912 }
913
914 case OTPLOCK:
915 {
916 struct otp_info oinfo;
917
918 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
919 return -EINVAL;
920 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
921 return -EFAULT;
922 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
923 break;
924 }
925
926 /* This ioctl is being deprecated - it truncates the ECC layout */
927 case ECCGETLAYOUT:
928 {
929 struct nand_ecclayout_user *usrlay;
930
931 if (!mtd->ooblayout)
932 return -EOPNOTSUPP;
933
934 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
935 if (!usrlay)
936 return -ENOMEM;
937
938 shrink_ecclayout(mtd, usrlay);
939
940 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
941 ret = -EFAULT;
942 kfree(usrlay);
943 break;
944 }
945
946 case ECCGETSTATS:
947 {
948 if (copy_to_user(argp, &mtd->ecc_stats,
949 sizeof(struct mtd_ecc_stats)))
950 return -EFAULT;
951 break;
952 }
953
954 case MTDFILEMODE:
955 {
956 mfi->mode = 0;
957
958 switch(arg) {
959 case MTD_FILE_MODE_OTP_FACTORY:
960 case MTD_FILE_MODE_OTP_USER:
961 ret = otp_select_filemode(mfi, arg);
962 break;
963
964 case MTD_FILE_MODE_RAW:
965 if (!mtd_has_oob(mtd))
966 return -EOPNOTSUPP;
967 mfi->mode = arg;
968
969 case MTD_FILE_MODE_NORMAL:
970 break;
971 default:
972 ret = -EINVAL;
973 }
974 file->f_pos = 0;
975 break;
976 }
977
978 case BLKPG:
979 {
980 struct blkpg_ioctl_arg __user *blk_arg = argp;
981 struct blkpg_ioctl_arg a;
982
983 if (copy_from_user(&a, blk_arg, sizeof(a)))
984 ret = -EFAULT;
985 else
986 ret = mtdchar_blkpg_ioctl(mtd, &a);
987 break;
988 }
989
990 case BLKRRPART:
991 {
992 /* No reread partition feature. Just return ok */
993 ret = 0;
994 break;
995 }
996
997 default:
998 ret = -ENOTTY;
999 }
1000
1001 return ret;
1002} /* memory_ioctl */
1003
1004static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1005{
1006 int ret;
1007
1008 mutex_lock(&mtd_mutex);
1009 ret = mtdchar_ioctl(file, cmd, arg);
1010 mutex_unlock(&mtd_mutex);
1011
1012 return ret;
1013}
1014
1015#ifdef CONFIG_COMPAT
1016
1017struct mtd_oob_buf32 {
1018 u_int32_t start;
1019 u_int32_t length;
1020 compat_caddr_t ptr; /* unsigned char* */
1021};
1022
1023#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1024#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1025
1026static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1027 unsigned long arg)
1028{
1029 struct mtd_file_info *mfi = file->private_data;
1030 struct mtd_info *mtd = mfi->mtd;
1031 void __user *argp = compat_ptr(arg);
1032 int ret = 0;
1033
1034 mutex_lock(&mtd_mutex);
1035
1036 switch (cmd) {
1037 case MEMWRITEOOB32:
1038 {
1039 struct mtd_oob_buf32 buf;
1040 struct mtd_oob_buf32 __user *buf_user = argp;
1041
1042 if (copy_from_user(&buf, argp, sizeof(buf)))
1043 ret = -EFAULT;
1044 else
1045 ret = mtdchar_writeoob(file, mtd, buf.start,
1046 buf.length, compat_ptr(buf.ptr),
1047 &buf_user->length);
1048 break;
1049 }
1050
1051 case MEMREADOOB32:
1052 {
1053 struct mtd_oob_buf32 buf;
1054 struct mtd_oob_buf32 __user *buf_user = argp;
1055
1056 /* NOTE: writes return length to buf->start */
1057 if (copy_from_user(&buf, argp, sizeof(buf)))
1058 ret = -EFAULT;
1059 else
1060 ret = mtdchar_readoob(file, mtd, buf.start,
1061 buf.length, compat_ptr(buf.ptr),
1062 &buf_user->start);
1063 break;
1064 }
1065
1066 case BLKPG:
1067 {
1068 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1069 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1070 struct blkpg_compat_ioctl_arg compat_arg;
1071 struct blkpg_ioctl_arg a;
1072
1073 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1074 ret = -EFAULT;
1075 break;
1076 }
1077
1078 memset(&a, 0, sizeof(a));
1079 a.op = compat_arg.op;
1080 a.flags = compat_arg.flags;
1081 a.datalen = compat_arg.datalen;
1082 a.data = compat_ptr(compat_arg.data);
1083
1084 ret = mtdchar_blkpg_ioctl(mtd, &a);
1085 break;
1086 }
1087
1088 default:
1089 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1090 }
1091
1092 mutex_unlock(&mtd_mutex);
1093
1094 return ret;
1095}
1096
1097#endif /* CONFIG_COMPAT */
1098
1099/*
1100 * try to determine where a shared mapping can be made
1101 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1102 * mappings)
1103 */
1104#ifndef CONFIG_MMU
1105static unsigned long mtdchar_get_unmapped_area(struct file *file,
1106 unsigned long addr,
1107 unsigned long len,
1108 unsigned long pgoff,
1109 unsigned long flags)
1110{
1111 struct mtd_file_info *mfi = file->private_data;
1112 struct mtd_info *mtd = mfi->mtd;
1113 unsigned long offset;
1114 int ret;
1115
1116 if (addr != 0)
1117 return (unsigned long) -EINVAL;
1118
1119 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1120 return (unsigned long) -EINVAL;
1121
1122 offset = pgoff << PAGE_SHIFT;
1123 if (offset > mtd->size - len)
1124 return (unsigned long) -EINVAL;
1125
1126 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1127 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1128}
1129
1130static unsigned mtdchar_mmap_capabilities(struct file *file)
1131{
1132 struct mtd_file_info *mfi = file->private_data;
1133
1134 return mtd_mmap_capabilities(mfi->mtd);
1135}
1136#endif
1137
1138/*
1139 * set up a mapping for shared memory segments
1140 */
1141static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1142{
1143#ifdef CONFIG_MMU
1144 struct mtd_file_info *mfi = file->private_data;
1145 struct mtd_info *mtd = mfi->mtd;
1146 struct map_info *map = mtd->priv;
1147
1148 /* This is broken because it assumes the MTD device is map-based
1149 and that mtd->priv is a valid struct map_info. It should be
1150 replaced with something that uses the mtd_get_unmapped_area()
1151 operation properly. */
1152 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1153#ifdef pgprot_noncached
1154 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1155 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1156#endif
1157 return vm_iomap_memory(vma, map->phys, map->size);
1158 }
1159 return -ENODEV;
1160#else
1161 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1162#endif
1163}
1164
1165static const struct file_operations mtd_fops = {
1166 .owner = THIS_MODULE,
1167 .llseek = mtdchar_lseek,
1168 .read = mtdchar_read,
1169 .write = mtdchar_write,
1170 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1171#ifdef CONFIG_COMPAT
1172 .compat_ioctl = mtdchar_compat_ioctl,
1173#endif
1174 .open = mtdchar_open,
1175 .release = mtdchar_close,
1176 .mmap = mtdchar_mmap,
1177#ifndef CONFIG_MMU
1178 .get_unmapped_area = mtdchar_get_unmapped_area,
1179 .mmap_capabilities = mtdchar_mmap_capabilities,
1180#endif
1181};
1182
1183int __init init_mtdchar(void)
1184{
1185 int ret;
1186
1187 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1188 "mtd", &mtd_fops);
1189 if (ret < 0) {
1190 pr_err("Can't allocate major number %d for MTD\n",
1191 MTD_CHAR_MAJOR);
1192 return ret;
1193 }
1194
1195 return ret;
1196}
1197
1198void __exit cleanup_mtdchar(void)
1199{
1200 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1201}
1202
1203MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);