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compat: return -EFAULT on error in waitid()
[linux/fpc-iii.git] / drivers / mtd / mtdchar.c
blob82c06165d3d27351f3cebf9966b513b6669e96bf
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
41 static 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 */
47 struct mtd_file_info {
48 struct mtd_info *mtd;
49 struct inode *ino;
50 enum mtd_file_modes mode;
51 };
52
53 static 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
77 static int count;
78 static struct vfsmount *mnt;
79 static struct file_system_type mtd_inodefs_type;
80
81 static 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
143 out2:
144 iput(mtd_ino);
145 out1:
146 put_mtd_device(mtd);
147 out:
148 mutex_unlock(&mtd_mutex);
149 simple_release_fs(&mnt, &count);
150 return ret;
151 } /* mtdchar_open */
152
153 /*====================================================================*/
154
155 static 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
194 static 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
280 static 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 ======================================================================*/
363 static 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
369 static 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
400 static 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
449 static 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 */
513 static 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
538 static 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
574 static 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
623 static 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
1022 static 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
1035 struct 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
1044 static 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
1100 static 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 static inline unsigned long get_vm_size(struct vm_area_struct *vma)
1127 {
1128 return vma->vm_end - vma->vm_start;
1129 }
1130
1131 static inline resource_size_t get_vm_offset(struct vm_area_struct *vma)
1132 {
1133 return (resource_size_t) vma->vm_pgoff << PAGE_SHIFT;
1134 }
1135
1136 /*
1137 * Set a new vm offset.
1138 *
1139 * Verify that the incoming offset really works as a page offset,
1140 * and that the offset and size fit in a resource_size_t.
1141 */
1142 static inline int set_vm_offset(struct vm_area_struct *vma, resource_size_t off)
1143 {
1144 pgoff_t pgoff = off >> PAGE_SHIFT;
1145 if (off != (resource_size_t) pgoff << PAGE_SHIFT)
1146 return -EINVAL;
1147 if (off + get_vm_size(vma) - 1 < off)
1148 return -EINVAL;
1149 vma->vm_pgoff = pgoff;
1150 return 0;
1151 }
1152
1153 /*
1154 * set up a mapping for shared memory segments
1155 */
1156 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1157 {
1158 #ifdef CONFIG_MMU
1159 struct mtd_file_info *mfi = file->private_data;
1160 struct mtd_info *mtd = mfi->mtd;
1161 struct map_info *map = mtd->priv;
1162 resource_size_t start, off;
1163 unsigned long len, vma_len;
1164
1165 /* This is broken because it assumes the MTD device is map-based
1166 and that mtd->priv is a valid struct map_info. It should be
1167 replaced with something that uses the mtd_get_unmapped_area()
1168 operation properly. */
1169 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1170 off = get_vm_offset(vma);
1171 start = map->phys;
1172 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
1173 start &= PAGE_MASK;
1174 vma_len = get_vm_size(vma);
1175
1176 /* Overflow in off+len? */
1177 if (vma_len + off < off)
1178 return -EINVAL;
1179 /* Does it fit in the mapping? */
1180 if (vma_len + off > len)
1181 return -EINVAL;
1182
1183 off += start;
1184 /* Did that overflow? */
1185 if (off < start)
1186 return -EINVAL;
1187 if (set_vm_offset(vma, off) < 0)
1188 return -EINVAL;
1189 vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
1190
1191 #ifdef pgprot_noncached
1192 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1193 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1194 #endif
1195 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1196 vma->vm_end - vma->vm_start,
1197 vma->vm_page_prot))
1198 return -EAGAIN;
1199
1200 return 0;
1201 }
1202 return -ENOSYS;
1203 #else
1204 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1205 #endif
1206 }
1207
1208 static const struct file_operations mtd_fops = {
1209 .owner = THIS_MODULE,
1210 .llseek = mtdchar_lseek,
1211 .read = mtdchar_read,
1212 .write = mtdchar_write,
1213 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1214 #ifdef CONFIG_COMPAT
1215 .compat_ioctl = mtdchar_compat_ioctl,
1216 #endif
1217 .open = mtdchar_open,
1218 .release = mtdchar_close,
1219 .mmap = mtdchar_mmap,
1220 #ifndef CONFIG_MMU
1221 .get_unmapped_area = mtdchar_get_unmapped_area,
1222 #endif
1223 };
1224
1225 static const struct super_operations mtd_ops = {
1226 .drop_inode = generic_delete_inode,
1227 .statfs = simple_statfs,
1228 };
1229
1230 static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1231 int flags, const char *dev_name, void *data)
1232 {
1233 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
1234 }
1235
1236 static struct file_system_type mtd_inodefs_type = {
1237 .name = "mtd_inodefs",
1238 .mount = mtd_inodefs_mount,
1239 .kill_sb = kill_anon_super,
1240 };
1241
1242 static int __init init_mtdchar(void)
1243 {
1244 int ret;
1245
1246 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1247 "mtd", &mtd_fops);
1248 if (ret < 0) {
1249 pr_notice("Can't allocate major number %d for "
1250 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1251 return ret;
1252 }
1253
1254 ret = register_filesystem(&mtd_inodefs_type);
1255 if (ret) {
1256 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1257 goto err_unregister_chdev;
1258 }
1259 return ret;
1260
1261 err_unregister_chdev:
1262 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1263 return ret;
1264 }
1265
1266 static void __exit cleanup_mtdchar(void)
1267 {
1268 unregister_filesystem(&mtd_inodefs_type);
1269 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1270 }
1271
1272 module_init(init_mtdchar);
1273 module_exit(cleanup_mtdchar);
1274
1275 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1276
1277 MODULE_LICENSE("GPL");
1278 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1279 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1280 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linux with added FPC-III support