Loading...
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/mtd/mtd.h>
36#include <linux/mtd/partitions.h>
37#include <linux/mtd/map.h>
38
39#include <asm/uaccess.h>
40
41static DEFINE_MUTEX(mtd_mutex);
42
43/*
44 * Data structure to hold the pointer to the mtd device as well
45 * as mode information of various use cases.
46 */
47struct mtd_file_info {
48 struct mtd_info *mtd;
49 struct inode *ino;
50 enum mtd_file_modes mode;
51};
52
53static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
54{
55 struct mtd_file_info *mfi = file->private_data;
56 struct mtd_info *mtd = mfi->mtd;
57
58 switch (orig) {
59 case SEEK_SET:
60 break;
61 case SEEK_CUR:
62 offset += file->f_pos;
63 break;
64 case SEEK_END:
65 offset += mtd->size;
66 break;
67 default:
68 return -EINVAL;
69 }
70
71 if (offset >= 0 && offset <= mtd->size)
72 return file->f_pos = offset;
73
74 return -EINVAL;
75}
76
77static int count;
78static struct vfsmount *mnt;
79static struct file_system_type mtd_inodefs_type;
80
81static int mtdchar_open(struct inode *inode, struct file *file)
82{
83 int minor = iminor(inode);
84 int devnum = minor >> 1;
85 int ret = 0;
86 struct mtd_info *mtd;
87 struct mtd_file_info *mfi;
88 struct inode *mtd_ino;
89
90 pr_debug("MTD_open\n");
91
92 /* You can't open the RO devices RW */
93 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
94 return -EACCES;
95
96 ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count);
97 if (ret)
98 return ret;
99
100 mutex_lock(&mtd_mutex);
101 mtd = get_mtd_device(NULL, devnum);
102
103 if (IS_ERR(mtd)) {
104 ret = PTR_ERR(mtd);
105 goto out;
106 }
107
108 if (mtd->type == MTD_ABSENT) {
109 ret = -ENODEV;
110 goto out1;
111 }
112
113 mtd_ino = iget_locked(mnt->mnt_sb, devnum);
114 if (!mtd_ino) {
115 ret = -ENOMEM;
116 goto out1;
117 }
118 if (mtd_ino->i_state & I_NEW) {
119 mtd_ino->i_private = mtd;
120 mtd_ino->i_mode = S_IFCHR;
121 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
122 unlock_new_inode(mtd_ino);
123 }
124 file->f_mapping = mtd_ino->i_mapping;
125
126 /* You can't open it RW if it's not a writeable device */
127 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
128 ret = -EACCES;
129 goto out2;
130 }
131
132 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
133 if (!mfi) {
134 ret = -ENOMEM;
135 goto out2;
136 }
137 mfi->ino = mtd_ino;
138 mfi->mtd = mtd;
139 file->private_data = mfi;
140 mutex_unlock(&mtd_mutex);
141 return 0;
142
143out2:
144 iput(mtd_ino);
145out1:
146 put_mtd_device(mtd);
147out:
148 mutex_unlock(&mtd_mutex);
149 simple_release_fs(&mnt, &count);
150 return ret;
151} /* mtdchar_open */
152
153/*====================================================================*/
154
155static int mtdchar_close(struct inode *inode, struct file *file)
156{
157 struct mtd_file_info *mfi = file->private_data;
158 struct mtd_info *mtd = mfi->mtd;
159
160 pr_debug("MTD_close\n");
161
162 /* Only sync if opened RW */
163 if ((file->f_mode & FMODE_WRITE))
164 mtd_sync(mtd);
165
166 iput(mfi->ino);
167
168 put_mtd_device(mtd);
169 file->private_data = NULL;
170 kfree(mfi);
171 simple_release_fs(&mnt, &count);
172
173 return 0;
174} /* mtdchar_close */
175
176/* Back in June 2001, dwmw2 wrote:
177 *
178 * FIXME: This _really_ needs to die. In 2.5, we should lock the
179 * userspace buffer down and use it directly with readv/writev.
180 *
181 * The implementation below, using mtd_kmalloc_up_to, mitigates
182 * allocation failures when the system is under low-memory situations
183 * or if memory is highly fragmented at the cost of reducing the
184 * performance of the requested transfer due to a smaller buffer size.
185 *
186 * A more complex but more memory-efficient implementation based on
187 * get_user_pages and iovecs to cover extents of those pages is a
188 * longer-term goal, as intimated by dwmw2 above. However, for the
189 * write case, this requires yet more complex head and tail transfer
190 * handling when those head and tail offsets and sizes are such that
191 * alignment requirements are not met in the NAND subdriver.
192 */
193
194static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
195 loff_t *ppos)
196{
197 struct mtd_file_info *mfi = file->private_data;
198 struct mtd_info *mtd = mfi->mtd;
199 size_t retlen;
200 size_t total_retlen=0;
201 int ret=0;
202 int len;
203 size_t size = count;
204 char *kbuf;
205
206 pr_debug("MTD_read\n");
207
208 if (*ppos + count > mtd->size)
209 count = mtd->size - *ppos;
210
211 if (!count)
212 return 0;
213
214 kbuf = mtd_kmalloc_up_to(mtd, &size);
215 if (!kbuf)
216 return -ENOMEM;
217
218 while (count) {
219 len = min_t(size_t, count, size);
220
221 switch (mfi->mode) {
222 case MTD_FILE_MODE_OTP_FACTORY:
223 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
224 &retlen, kbuf);
225 break;
226 case MTD_FILE_MODE_OTP_USER:
227 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
228 &retlen, kbuf);
229 break;
230 case MTD_FILE_MODE_RAW:
231 {
232 struct mtd_oob_ops ops;
233
234 ops.mode = MTD_OPS_RAW;
235 ops.datbuf = kbuf;
236 ops.oobbuf = NULL;
237 ops.len = len;
238
239 ret = mtd_read_oob(mtd, *ppos, &ops);
240 retlen = ops.retlen;
241 break;
242 }
243 default:
244 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
245 }
246 /* Nand returns -EBADMSG on ECC errors, but it returns
247 * the data. For our userspace tools it is important
248 * to dump areas with ECC errors!
249 * For kernel internal usage it also might return -EUCLEAN
250 * to signal the caller that a bitflip has occurred and has
251 * been corrected by the ECC algorithm.
252 * Userspace software which accesses NAND this way
253 * must be aware of the fact that it deals with NAND
254 */
255 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
256 *ppos += retlen;
257 if (copy_to_user(buf, kbuf, retlen)) {
258 kfree(kbuf);
259 return -EFAULT;
260 }
261 else
262 total_retlen += retlen;
263
264 count -= retlen;
265 buf += retlen;
266 if (retlen == 0)
267 count = 0;
268 }
269 else {
270 kfree(kbuf);
271 return ret;
272 }
273
274 }
275
276 kfree(kbuf);
277 return total_retlen;
278} /* mtdchar_read */
279
280static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
281 loff_t *ppos)
282{
283 struct mtd_file_info *mfi = file->private_data;
284 struct mtd_info *mtd = mfi->mtd;
285 size_t size = count;
286 char *kbuf;
287 size_t retlen;
288 size_t total_retlen=0;
289 int ret=0;
290 int len;
291
292 pr_debug("MTD_write\n");
293
294 if (*ppos == mtd->size)
295 return -ENOSPC;
296
297 if (*ppos + count > mtd->size)
298 count = mtd->size - *ppos;
299
300 if (!count)
301 return 0;
302
303 kbuf = mtd_kmalloc_up_to(mtd, &size);
304 if (!kbuf)
305 return -ENOMEM;
306
307 while (count) {
308 len = min_t(size_t, count, size);
309
310 if (copy_from_user(kbuf, buf, len)) {
311 kfree(kbuf);
312 return -EFAULT;
313 }
314
315 switch (mfi->mode) {
316 case MTD_FILE_MODE_OTP_FACTORY:
317 ret = -EROFS;
318 break;
319 case MTD_FILE_MODE_OTP_USER:
320 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
321 &retlen, kbuf);
322 break;
323
324 case MTD_FILE_MODE_RAW:
325 {
326 struct mtd_oob_ops ops;
327
328 ops.mode = MTD_OPS_RAW;
329 ops.datbuf = kbuf;
330 ops.oobbuf = NULL;
331 ops.ooboffs = 0;
332 ops.len = len;
333
334 ret = mtd_write_oob(mtd, *ppos, &ops);
335 retlen = ops.retlen;
336 break;
337 }
338
339 default:
340 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
341 }
342 if (!ret) {
343 *ppos += retlen;
344 total_retlen += retlen;
345 count -= retlen;
346 buf += retlen;
347 }
348 else {
349 kfree(kbuf);
350 return ret;
351 }
352 }
353
354 kfree(kbuf);
355 return total_retlen;
356} /* mtdchar_write */
357
358/*======================================================================
359
360 IOCTL calls for getting device parameters.
361
362======================================================================*/
363static void mtdchar_erase_callback (struct erase_info *instr)
364{
365 wake_up((wait_queue_head_t *)instr->priv);
366}
367
368#ifdef CONFIG_HAVE_MTD_OTP
369static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
370{
371 struct mtd_info *mtd = mfi->mtd;
372 size_t retlen;
373 int ret = 0;
374
375 /*
376 * Make a fake call to mtd_read_fact_prot_reg() to check if OTP
377 * operations are supported.
378 */
379 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == -EOPNOTSUPP)
380 return -EOPNOTSUPP;
381
382 switch (mode) {
383 case MTD_OTP_FACTORY:
384 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
385 break;
386 case MTD_OTP_USER:
387 mfi->mode = MTD_FILE_MODE_OTP_USER;
388 break;
389 default:
390 ret = -EINVAL;
391 case MTD_OTP_OFF:
392 break;
393 }
394 return ret;
395}
396#else
397# define otp_select_filemode(f,m) -EOPNOTSUPP
398#endif
399
400static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
401 uint64_t start, uint32_t length, void __user *ptr,
402 uint32_t __user *retp)
403{
404 struct mtd_file_info *mfi = file->private_data;
405 struct mtd_oob_ops ops;
406 uint32_t retlen;
407 int ret = 0;
408
409 if (!(file->f_mode & FMODE_WRITE))
410 return -EPERM;
411
412 if (length > 4096)
413 return -EINVAL;
414
415 if (!mtd->_write_oob)
416 ret = -EOPNOTSUPP;
417 else
418 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
419
420 if (ret)
421 return ret;
422
423 ops.ooblen = length;
424 ops.ooboffs = start & (mtd->writesize - 1);
425 ops.datbuf = NULL;
426 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
427 MTD_OPS_PLACE_OOB;
428
429 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
430 return -EINVAL;
431
432 ops.oobbuf = memdup_user(ptr, length);
433 if (IS_ERR(ops.oobbuf))
434 return PTR_ERR(ops.oobbuf);
435
436 start &= ~((uint64_t)mtd->writesize - 1);
437 ret = mtd_write_oob(mtd, start, &ops);
438
439 if (ops.oobretlen > 0xFFFFFFFFU)
440 ret = -EOVERFLOW;
441 retlen = ops.oobretlen;
442 if (copy_to_user(retp, &retlen, sizeof(length)))
443 ret = -EFAULT;
444
445 kfree(ops.oobbuf);
446 return ret;
447}
448
449static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
450 uint64_t start, uint32_t length, void __user *ptr,
451 uint32_t __user *retp)
452{
453 struct mtd_file_info *mfi = file->private_data;
454 struct mtd_oob_ops ops;
455 int ret = 0;
456
457 if (length > 4096)
458 return -EINVAL;
459
460 if (!access_ok(VERIFY_WRITE, ptr, length))
461 return -EFAULT;
462
463 ops.ooblen = length;
464 ops.ooboffs = start & (mtd->writesize - 1);
465 ops.datbuf = NULL;
466 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
467 MTD_OPS_PLACE_OOB;
468
469 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
470 return -EINVAL;
471
472 ops.oobbuf = kmalloc(length, GFP_KERNEL);
473 if (!ops.oobbuf)
474 return -ENOMEM;
475
476 start &= ~((uint64_t)mtd->writesize - 1);
477 ret = mtd_read_oob(mtd, start, &ops);
478
479 if (put_user(ops.oobretlen, retp))
480 ret = -EFAULT;
481 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
482 ops.oobretlen))
483 ret = -EFAULT;
484
485 kfree(ops.oobbuf);
486
487 /*
488 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
489 * data. For our userspace tools it is important to dump areas
490 * with ECC errors!
491 * For kernel internal usage it also might return -EUCLEAN
492 * to signal the caller that a bitflip has occured and has
493 * been corrected by the ECC algorithm.
494 *
495 * Note: currently the standard NAND function, nand_read_oob_std,
496 * does not calculate ECC for the OOB area, so do not rely on
497 * this behavior unless you have replaced it with your own.
498 */
499 if (mtd_is_bitflip_or_eccerr(ret))
500 return 0;
501
502 return ret;
503}
504
505/*
506 * Copies (and truncates, if necessary) data from the larger struct,
507 * nand_ecclayout, to the smaller, deprecated layout struct,
508 * nand_ecclayout_user. This is necessary only to support the deprecated
509 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
510 * nand_ecclayout flexibly (i.e. the struct may change size in new
511 * releases without requiring major rewrites).
512 */
513static int shrink_ecclayout(const struct nand_ecclayout *from,
514 struct nand_ecclayout_user *to)
515{
516 int i;
517
518 if (!from || !to)
519 return -EINVAL;
520
521 memset(to, 0, sizeof(*to));
522
523 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
524 for (i = 0; i < to->eccbytes; i++)
525 to->eccpos[i] = from->eccpos[i];
526
527 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
528 if (from->oobfree[i].length == 0 &&
529 from->oobfree[i].offset == 0)
530 break;
531 to->oobavail += from->oobfree[i].length;
532 to->oobfree[i] = from->oobfree[i];
533 }
534
535 return 0;
536}
537
538static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
539 struct blkpg_ioctl_arg __user *arg)
540{
541 struct blkpg_ioctl_arg a;
542 struct blkpg_partition p;
543
544 if (!capable(CAP_SYS_ADMIN))
545 return -EPERM;
546
547 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
548 return -EFAULT;
549
550 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
551 return -EFAULT;
552
553 switch (a.op) {
554 case BLKPG_ADD_PARTITION:
555
556 /* Only master mtd device must be used to add partitions */
557 if (mtd_is_partition(mtd))
558 return -EINVAL;
559
560 return mtd_add_partition(mtd, p.devname, p.start, p.length);
561
562 case BLKPG_DEL_PARTITION:
563
564 if (p.pno < 0)
565 return -EINVAL;
566
567 return mtd_del_partition(mtd, p.pno);
568
569 default:
570 return -EINVAL;
571 }
572}
573
574static int mtdchar_write_ioctl(struct mtd_info *mtd,
575 struct mtd_write_req __user *argp)
576{
577 struct mtd_write_req req;
578 struct mtd_oob_ops ops;
579 void __user *usr_data, *usr_oob;
580 int ret;
581
582 if (copy_from_user(&req, argp, sizeof(req)) ||
583 !access_ok(VERIFY_READ, req.usr_data, req.len) ||
584 !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
585 return -EFAULT;
586 if (!mtd->_write_oob)
587 return -EOPNOTSUPP;
588
589 ops.mode = req.mode;
590 ops.len = (size_t)req.len;
591 ops.ooblen = (size_t)req.ooblen;
592 ops.ooboffs = 0;
593
594 usr_data = (void __user *)(uintptr_t)req.usr_data;
595 usr_oob = (void __user *)(uintptr_t)req.usr_oob;
596
597 if (req.usr_data) {
598 ops.datbuf = memdup_user(usr_data, ops.len);
599 if (IS_ERR(ops.datbuf))
600 return PTR_ERR(ops.datbuf);
601 } else {
602 ops.datbuf = NULL;
603 }
604
605 if (req.usr_oob) {
606 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
607 if (IS_ERR(ops.oobbuf)) {
608 kfree(ops.datbuf);
609 return PTR_ERR(ops.oobbuf);
610 }
611 } else {
612 ops.oobbuf = NULL;
613 }
614
615 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
616
617 kfree(ops.datbuf);
618 kfree(ops.oobbuf);
619
620 return ret;
621}
622
623static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
624{
625 struct mtd_file_info *mfi = file->private_data;
626 struct mtd_info *mtd = mfi->mtd;
627 void __user *argp = (void __user *)arg;
628 int ret = 0;
629 u_long size;
630 struct mtd_info_user info;
631
632 pr_debug("MTD_ioctl\n");
633
634 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
635 if (cmd & IOC_IN) {
636 if (!access_ok(VERIFY_READ, argp, size))
637 return -EFAULT;
638 }
639 if (cmd & IOC_OUT) {
640 if (!access_ok(VERIFY_WRITE, argp, size))
641 return -EFAULT;
642 }
643
644 switch (cmd) {
645 case MEMGETREGIONCOUNT:
646 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
647 return -EFAULT;
648 break;
649
650 case MEMGETREGIONINFO:
651 {
652 uint32_t ur_idx;
653 struct mtd_erase_region_info *kr;
654 struct region_info_user __user *ur = argp;
655
656 if (get_user(ur_idx, &(ur->regionindex)))
657 return -EFAULT;
658
659 if (ur_idx >= mtd->numeraseregions)
660 return -EINVAL;
661
662 kr = &(mtd->eraseregions[ur_idx]);
663
664 if (put_user(kr->offset, &(ur->offset))
665 || put_user(kr->erasesize, &(ur->erasesize))
666 || put_user(kr->numblocks, &(ur->numblocks)))
667 return -EFAULT;
668
669 break;
670 }
671
672 case MEMGETINFO:
673 memset(&info, 0, sizeof(info));
674 info.type = mtd->type;
675 info.flags = mtd->flags;
676 info.size = mtd->size;
677 info.erasesize = mtd->erasesize;
678 info.writesize = mtd->writesize;
679 info.oobsize = mtd->oobsize;
680 /* The below field is obsolete */
681 info.padding = 0;
682 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
683 return -EFAULT;
684 break;
685
686 case MEMERASE:
687 case MEMERASE64:
688 {
689 struct erase_info *erase;
690
691 if(!(file->f_mode & FMODE_WRITE))
692 return -EPERM;
693
694 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
695 if (!erase)
696 ret = -ENOMEM;
697 else {
698 wait_queue_head_t waitq;
699 DECLARE_WAITQUEUE(wait, current);
700
701 init_waitqueue_head(&waitq);
702
703 if (cmd == MEMERASE64) {
704 struct erase_info_user64 einfo64;
705
706 if (copy_from_user(&einfo64, argp,
707 sizeof(struct erase_info_user64))) {
708 kfree(erase);
709 return -EFAULT;
710 }
711 erase->addr = einfo64.start;
712 erase->len = einfo64.length;
713 } else {
714 struct erase_info_user einfo32;
715
716 if (copy_from_user(&einfo32, argp,
717 sizeof(struct erase_info_user))) {
718 kfree(erase);
719 return -EFAULT;
720 }
721 erase->addr = einfo32.start;
722 erase->len = einfo32.length;
723 }
724 erase->mtd = mtd;
725 erase->callback = mtdchar_erase_callback;
726 erase->priv = (unsigned long)&waitq;
727
728 /*
729 FIXME: Allow INTERRUPTIBLE. Which means
730 not having the wait_queue head on the stack.
731
732 If the wq_head is on the stack, and we
733 leave because we got interrupted, then the
734 wq_head is no longer there when the
735 callback routine tries to wake us up.
736 */
737 ret = mtd_erase(mtd, erase);
738 if (!ret) {
739 set_current_state(TASK_UNINTERRUPTIBLE);
740 add_wait_queue(&waitq, &wait);
741 if (erase->state != MTD_ERASE_DONE &&
742 erase->state != MTD_ERASE_FAILED)
743 schedule();
744 remove_wait_queue(&waitq, &wait);
745 set_current_state(TASK_RUNNING);
746
747 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
748 }
749 kfree(erase);
750 }
751 break;
752 }
753
754 case MEMWRITEOOB:
755 {
756 struct mtd_oob_buf buf;
757 struct mtd_oob_buf __user *buf_user = argp;
758
759 /* NOTE: writes return length to buf_user->length */
760 if (copy_from_user(&buf, argp, sizeof(buf)))
761 ret = -EFAULT;
762 else
763 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
764 buf.ptr, &buf_user->length);
765 break;
766 }
767
768 case MEMREADOOB:
769 {
770 struct mtd_oob_buf buf;
771 struct mtd_oob_buf __user *buf_user = argp;
772
773 /* NOTE: writes return length to buf_user->start */
774 if (copy_from_user(&buf, argp, sizeof(buf)))
775 ret = -EFAULT;
776 else
777 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
778 buf.ptr, &buf_user->start);
779 break;
780 }
781
782 case MEMWRITEOOB64:
783 {
784 struct mtd_oob_buf64 buf;
785 struct mtd_oob_buf64 __user *buf_user = argp;
786
787 if (copy_from_user(&buf, argp, sizeof(buf)))
788 ret = -EFAULT;
789 else
790 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
791 (void __user *)(uintptr_t)buf.usr_ptr,
792 &buf_user->length);
793 break;
794 }
795
796 case MEMREADOOB64:
797 {
798 struct mtd_oob_buf64 buf;
799 struct mtd_oob_buf64 __user *buf_user = argp;
800
801 if (copy_from_user(&buf, argp, sizeof(buf)))
802 ret = -EFAULT;
803 else
804 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
805 (void __user *)(uintptr_t)buf.usr_ptr,
806 &buf_user->length);
807 break;
808 }
809
810 case MEMWRITE:
811 {
812 ret = mtdchar_write_ioctl(mtd,
813 (struct mtd_write_req __user *)arg);
814 break;
815 }
816
817 case MEMLOCK:
818 {
819 struct erase_info_user einfo;
820
821 if (copy_from_user(&einfo, argp, sizeof(einfo)))
822 return -EFAULT;
823
824 ret = mtd_lock(mtd, einfo.start, einfo.length);
825 break;
826 }
827
828 case MEMUNLOCK:
829 {
830 struct erase_info_user einfo;
831
832 if (copy_from_user(&einfo, argp, sizeof(einfo)))
833 return -EFAULT;
834
835 ret = mtd_unlock(mtd, einfo.start, einfo.length);
836 break;
837 }
838
839 case MEMISLOCKED:
840 {
841 struct erase_info_user einfo;
842
843 if (copy_from_user(&einfo, argp, sizeof(einfo)))
844 return -EFAULT;
845
846 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
847 break;
848 }
849
850 /* Legacy interface */
851 case MEMGETOOBSEL:
852 {
853 struct nand_oobinfo oi;
854
855 if (!mtd->ecclayout)
856 return -EOPNOTSUPP;
857 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
858 return -EINVAL;
859
860 oi.useecc = MTD_NANDECC_AUTOPLACE;
861 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
862 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
863 sizeof(oi.oobfree));
864 oi.eccbytes = mtd->ecclayout->eccbytes;
865
866 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
867 return -EFAULT;
868 break;
869 }
870
871 case MEMGETBADBLOCK:
872 {
873 loff_t offs;
874
875 if (copy_from_user(&offs, argp, sizeof(loff_t)))
876 return -EFAULT;
877 return mtd_block_isbad(mtd, offs);
878 break;
879 }
880
881 case MEMSETBADBLOCK:
882 {
883 loff_t offs;
884
885 if (copy_from_user(&offs, argp, sizeof(loff_t)))
886 return -EFAULT;
887 return mtd_block_markbad(mtd, offs);
888 break;
889 }
890
891#ifdef CONFIG_HAVE_MTD_OTP
892 case OTPSELECT:
893 {
894 int mode;
895 if (copy_from_user(&mode, argp, sizeof(int)))
896 return -EFAULT;
897
898 mfi->mode = MTD_FILE_MODE_NORMAL;
899
900 ret = otp_select_filemode(mfi, mode);
901
902 file->f_pos = 0;
903 break;
904 }
905
906 case OTPGETREGIONCOUNT:
907 case OTPGETREGIONINFO:
908 {
909 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
910 if (!buf)
911 return -ENOMEM;
912 switch (mfi->mode) {
913 case MTD_FILE_MODE_OTP_FACTORY:
914 ret = mtd_get_fact_prot_info(mtd, buf, 4096);
915 break;
916 case MTD_FILE_MODE_OTP_USER:
917 ret = mtd_get_user_prot_info(mtd, buf, 4096);
918 break;
919 default:
920 ret = -EINVAL;
921 break;
922 }
923 if (ret >= 0) {
924 if (cmd == OTPGETREGIONCOUNT) {
925 int nbr = ret / sizeof(struct otp_info);
926 ret = copy_to_user(argp, &nbr, sizeof(int));
927 } else
928 ret = copy_to_user(argp, buf, ret);
929 if (ret)
930 ret = -EFAULT;
931 }
932 kfree(buf);
933 break;
934 }
935
936 case OTPLOCK:
937 {
938 struct otp_info oinfo;
939
940 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
941 return -EINVAL;
942 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
943 return -EFAULT;
944 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
945 break;
946 }
947#endif
948
949 /* This ioctl is being deprecated - it truncates the ECC layout */
950 case ECCGETLAYOUT:
951 {
952 struct nand_ecclayout_user *usrlay;
953
954 if (!mtd->ecclayout)
955 return -EOPNOTSUPP;
956
957 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
958 if (!usrlay)
959 return -ENOMEM;
960
961 shrink_ecclayout(mtd->ecclayout, usrlay);
962
963 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
964 ret = -EFAULT;
965 kfree(usrlay);
966 break;
967 }
968
969 case ECCGETSTATS:
970 {
971 if (copy_to_user(argp, &mtd->ecc_stats,
972 sizeof(struct mtd_ecc_stats)))
973 return -EFAULT;
974 break;
975 }
976
977 case MTDFILEMODE:
978 {
979 mfi->mode = 0;
980
981 switch(arg) {
982 case MTD_FILE_MODE_OTP_FACTORY:
983 case MTD_FILE_MODE_OTP_USER:
984 ret = otp_select_filemode(mfi, arg);
985 break;
986
987 case MTD_FILE_MODE_RAW:
988 if (!mtd_has_oob(mtd))
989 return -EOPNOTSUPP;
990 mfi->mode = arg;
991
992 case MTD_FILE_MODE_NORMAL:
993 break;
994 default:
995 ret = -EINVAL;
996 }
997 file->f_pos = 0;
998 break;
999 }
1000
1001 case BLKPG:
1002 {
1003 ret = mtdchar_blkpg_ioctl(mtd,
1004 (struct blkpg_ioctl_arg __user *)arg);
1005 break;
1006 }
1007
1008 case BLKRRPART:
1009 {
1010 /* No reread partition feature. Just return ok */
1011 ret = 0;
1012 break;
1013 }
1014
1015 default:
1016 ret = -ENOTTY;
1017 }
1018
1019 return ret;
1020} /* memory_ioctl */
1021
1022static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1023{
1024 int ret;
1025
1026 mutex_lock(&mtd_mutex);
1027 ret = mtdchar_ioctl(file, cmd, arg);
1028 mutex_unlock(&mtd_mutex);
1029
1030 return ret;
1031}
1032
1033#ifdef CONFIG_COMPAT
1034
1035struct mtd_oob_buf32 {
1036 u_int32_t start;
1037 u_int32_t length;
1038 compat_caddr_t ptr; /* unsigned char* */
1039};
1040
1041#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1042#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1043
1044static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1045 unsigned long arg)
1046{
1047 struct mtd_file_info *mfi = file->private_data;
1048 struct mtd_info *mtd = mfi->mtd;
1049 void __user *argp = compat_ptr(arg);
1050 int ret = 0;
1051
1052 mutex_lock(&mtd_mutex);
1053
1054 switch (cmd) {
1055 case MEMWRITEOOB32:
1056 {
1057 struct mtd_oob_buf32 buf;
1058 struct mtd_oob_buf32 __user *buf_user = argp;
1059
1060 if (copy_from_user(&buf, argp, sizeof(buf)))
1061 ret = -EFAULT;
1062 else
1063 ret = mtdchar_writeoob(file, mtd, buf.start,
1064 buf.length, compat_ptr(buf.ptr),
1065 &buf_user->length);
1066 break;
1067 }
1068
1069 case MEMREADOOB32:
1070 {
1071 struct mtd_oob_buf32 buf;
1072 struct mtd_oob_buf32 __user *buf_user = argp;
1073
1074 /* NOTE: writes return length to buf->start */
1075 if (copy_from_user(&buf, argp, sizeof(buf)))
1076 ret = -EFAULT;
1077 else
1078 ret = mtdchar_readoob(file, mtd, buf.start,
1079 buf.length, compat_ptr(buf.ptr),
1080 &buf_user->start);
1081 break;
1082 }
1083 default:
1084 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1085 }
1086
1087 mutex_unlock(&mtd_mutex);
1088
1089 return ret;
1090}
1091
1092#endif /* CONFIG_COMPAT */
1093
1094/*
1095 * try to determine where a shared mapping can be made
1096 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1097 * mappings)
1098 */
1099#ifndef CONFIG_MMU
1100static unsigned long mtdchar_get_unmapped_area(struct file *file,
1101 unsigned long addr,
1102 unsigned long len,
1103 unsigned long pgoff,
1104 unsigned long flags)
1105{
1106 struct mtd_file_info *mfi = file->private_data;
1107 struct mtd_info *mtd = mfi->mtd;
1108 unsigned long offset;
1109 int ret;
1110
1111 if (addr != 0)
1112 return (unsigned long) -EINVAL;
1113
1114 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1115 return (unsigned long) -EINVAL;
1116
1117 offset = pgoff << PAGE_SHIFT;
1118 if (offset > mtd->size - len)
1119 return (unsigned long) -EINVAL;
1120
1121 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1122 return ret == -EOPNOTSUPP ? -ENOSYS : ret;
1123}
1124#endif
1125
1126/*
1127 * set up a mapping for shared memory segments
1128 */
1129static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1130{
1131#ifdef CONFIG_MMU
1132 struct mtd_file_info *mfi = file->private_data;
1133 struct mtd_info *mtd = mfi->mtd;
1134 struct map_info *map = mtd->priv;
1135 unsigned long start;
1136 unsigned long off;
1137 u32 len;
1138
1139 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
1140 off = vma->vm_pgoff << PAGE_SHIFT;
1141 start = map->phys;
1142 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
1143 start &= PAGE_MASK;
1144 if ((vma->vm_end - vma->vm_start + off) > len)
1145 return -EINVAL;
1146
1147 off += start;
1148 vma->vm_pgoff = off >> PAGE_SHIFT;
1149 vma->vm_flags |= VM_IO | VM_RESERVED;
1150
1151#ifdef pgprot_noncached
1152 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1153 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1154#endif
1155 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1156 vma->vm_end - vma->vm_start,
1157 vma->vm_page_prot))
1158 return -EAGAIN;
1159
1160 return 0;
1161 }
1162 return -ENOSYS;
1163#else
1164 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1165#endif
1166}
1167
1168static const struct file_operations mtd_fops = {
1169 .owner = THIS_MODULE,
1170 .llseek = mtdchar_lseek,
1171 .read = mtdchar_read,
1172 .write = mtdchar_write,
1173 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1174#ifdef CONFIG_COMPAT
1175 .compat_ioctl = mtdchar_compat_ioctl,
1176#endif
1177 .open = mtdchar_open,
1178 .release = mtdchar_close,
1179 .mmap = mtdchar_mmap,
1180#ifndef CONFIG_MMU
1181 .get_unmapped_area = mtdchar_get_unmapped_area,
1182#endif
1183};
1184
1185static const struct super_operations mtd_ops = {
1186 .drop_inode = generic_delete_inode,
1187 .statfs = simple_statfs,
1188};
1189
1190static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1191 int flags, const char *dev_name, void *data)
1192{
1193 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
1194}
1195
1196static struct file_system_type mtd_inodefs_type = {
1197 .name = "mtd_inodefs",
1198 .mount = mtd_inodefs_mount,
1199 .kill_sb = kill_anon_super,
1200};
1201
1202static int __init init_mtdchar(void)
1203{
1204 int ret;
1205
1206 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1207 "mtd", &mtd_fops);
1208 if (ret < 0) {
1209 pr_notice("Can't allocate major number %d for "
1210 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1211 return ret;
1212 }
1213
1214 ret = register_filesystem(&mtd_inodefs_type);
1215 if (ret) {
1216 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1217 goto err_unregister_chdev;
1218 }
1219 return ret;
1220
1221err_unregister_chdev:
1222 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1223 return ret;
1224}
1225
1226static void __exit cleanup_mtdchar(void)
1227{
1228 unregister_filesystem(&mtd_inodefs_type);
1229 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1230}
1231
1232module_init(init_mtdchar);
1233module_exit(cleanup_mtdchar);
1234
1235MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1236
1237MODULE_LICENSE("GPL");
1238MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1239MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1240MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);