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xfs: fix the comment of xlog_recover_buffer_pass2()
[linux-2.6/btrfs-unstable.git] / drivers / mtd / mtdchar.c
blob684bfa39e4ee4892f901874c52c699fa71fd572a
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 #include "mtdcore.h"
42
43 static DEFINE_MUTEX(mtd_mutex);
44
45 /*
46 * Data structure to hold the pointer to the mtd device as well
47 * as mode information of various use cases.
48 */
49 struct mtd_file_info {
50 struct mtd_info *mtd;
51 struct inode *ino;
52 enum mtd_file_modes mode;
53 };
54
55 static 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
61 static int count;
62 static struct vfsmount *mnt;
63 static struct file_system_type mtd_inodefs_type;
64
65 static int mtdchar_open(struct inode *inode, struct file *file)
66 {
67 int minor = iminor(inode);
68 int devnum = minor >> 1;
69 int ret = 0;
70 struct mtd_info *mtd;
71 struct mtd_file_info *mfi;
72 struct inode *mtd_ino;
73
74 pr_debug("MTD_open\n");
75
76 /* You can't open the RO devices RW */
77 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
78 return -EACCES;
79
80 ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count);
81 if (ret)
82 return ret;
83
84 mutex_lock(&mtd_mutex);
85 mtd = get_mtd_device(NULL, devnum);
86
87 if (IS_ERR(mtd)) {
88 ret = PTR_ERR(mtd);
89 goto out;
90 }
91
92 if (mtd->type == MTD_ABSENT) {
93 ret = -ENODEV;
94 goto out1;
95 }
96
97 mtd_ino = iget_locked(mnt->mnt_sb, devnum);
98 if (!mtd_ino) {
99 ret = -ENOMEM;
100 goto out1;
101 }
102 if (mtd_ino->i_state & I_NEW) {
103 mtd_ino->i_private = mtd;
104 mtd_ino->i_mode = S_IFCHR;
105 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
106 unlock_new_inode(mtd_ino);
107 }
108 file->f_mapping = mtd_ino->i_mapping;
109
110 /* You can't open it RW if it's not a writeable device */
111 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
112 ret = -EACCES;
113 goto out2;
114 }
115
116 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
117 if (!mfi) {
118 ret = -ENOMEM;
119 goto out2;
120 }
121 mfi->ino = mtd_ino;
122 mfi->mtd = mtd;
123 file->private_data = mfi;
124 mutex_unlock(&mtd_mutex);
125 return 0;
126
127 out2:
128 iput(mtd_ino);
129 out1:
130 put_mtd_device(mtd);
131 out:
132 mutex_unlock(&mtd_mutex);
133 simple_release_fs(&mnt, &count);
134 return ret;
135 } /* mtdchar_open */
136
137 /*====================================================================*/
138
139 static int mtdchar_close(struct inode *inode, struct file *file)
140 {
141 struct mtd_file_info *mfi = file->private_data;
142 struct mtd_info *mtd = mfi->mtd;
143
144 pr_debug("MTD_close\n");
145
146 /* Only sync if opened RW */
147 if ((file->f_mode & FMODE_WRITE))
148 mtd_sync(mtd);
149
150 iput(mfi->ino);
151
152 put_mtd_device(mtd);
153 file->private_data = NULL;
154 kfree(mfi);
155 simple_release_fs(&mnt, &count);
156
157 return 0;
158 } /* mtdchar_close */
159
160 /* Back in June 2001, dwmw2 wrote:
161 *
162 * FIXME: This _really_ needs to die. In 2.5, we should lock the
163 * userspace buffer down and use it directly with readv/writev.
164 *
165 * The implementation below, using mtd_kmalloc_up_to, mitigates
166 * allocation failures when the system is under low-memory situations
167 * or if memory is highly fragmented at the cost of reducing the
168 * performance of the requested transfer due to a smaller buffer size.
169 *
170 * A more complex but more memory-efficient implementation based on
171 * get_user_pages and iovecs to cover extents of those pages is a
172 * longer-term goal, as intimated by dwmw2 above. However, for the
173 * write case, this requires yet more complex head and tail transfer
174 * handling when those head and tail offsets and sizes are such that
175 * alignment requirements are not met in the NAND subdriver.
176 */
177
178 static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
179 loff_t *ppos)
180 {
181 struct mtd_file_info *mfi = file->private_data;
182 struct mtd_info *mtd = mfi->mtd;
183 size_t retlen;
184 size_t total_retlen=0;
185 int ret=0;
186 int len;
187 size_t size = count;
188 char *kbuf;
189
190 pr_debug("MTD_read\n");
191
192 if (*ppos + count > mtd->size)
193 count = mtd->size - *ppos;
194
195 if (!count)
196 return 0;
197
198 kbuf = mtd_kmalloc_up_to(mtd, &size);
199 if (!kbuf)
200 return -ENOMEM;
201
202 while (count) {
203 len = min_t(size_t, count, size);
204
205 switch (mfi->mode) {
206 case MTD_FILE_MODE_OTP_FACTORY:
207 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
208 &retlen, kbuf);
209 break;
210 case MTD_FILE_MODE_OTP_USER:
211 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
212 &retlen, kbuf);
213 break;
214 case MTD_FILE_MODE_RAW:
215 {
216 struct mtd_oob_ops ops;
217
218 ops.mode = MTD_OPS_RAW;
219 ops.datbuf = kbuf;
220 ops.oobbuf = NULL;
221 ops.len = len;
222
223 ret = mtd_read_oob(mtd, *ppos, &ops);
224 retlen = ops.retlen;
225 break;
226 }
227 default:
228 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
229 }
230 /* Nand returns -EBADMSG on ECC errors, but it returns
231 * the data. For our userspace tools it is important
232 * to dump areas with ECC errors!
233 * For kernel internal usage it also might return -EUCLEAN
234 * to signal the caller that a bitflip has occurred and has
235 * been corrected by the ECC algorithm.
236 * Userspace software which accesses NAND this way
237 * must be aware of the fact that it deals with NAND
238 */
239 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
240 *ppos += retlen;
241 if (copy_to_user(buf, kbuf, retlen)) {
242 kfree(kbuf);
243 return -EFAULT;
244 }
245 else
246 total_retlen += retlen;
247
248 count -= retlen;
249 buf += retlen;
250 if (retlen == 0)
251 count = 0;
252 }
253 else {
254 kfree(kbuf);
255 return ret;
256 }
257
258 }
259
260 kfree(kbuf);
261 return total_retlen;
262 } /* mtdchar_read */
263
264 static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
265 loff_t *ppos)
266 {
267 struct mtd_file_info *mfi = file->private_data;
268 struct mtd_info *mtd = mfi->mtd;
269 size_t size = count;
270 char *kbuf;
271 size_t retlen;
272 size_t total_retlen=0;
273 int ret=0;
274 int len;
275
276 pr_debug("MTD_write\n");
277
278 if (*ppos == mtd->size)
279 return -ENOSPC;
280
281 if (*ppos + count > mtd->size)
282 count = mtd->size - *ppos;
283
284 if (!count)
285 return 0;
286
287 kbuf = mtd_kmalloc_up_to(mtd, &size);
288 if (!kbuf)
289 return -ENOMEM;
290
291 while (count) {
292 len = min_t(size_t, count, size);
293
294 if (copy_from_user(kbuf, buf, len)) {
295 kfree(kbuf);
296 return -EFAULT;
297 }
298
299 switch (mfi->mode) {
300 case MTD_FILE_MODE_OTP_FACTORY:
301 ret = -EROFS;
302 break;
303 case MTD_FILE_MODE_OTP_USER:
304 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
305 &retlen, kbuf);
306 break;
307
308 case MTD_FILE_MODE_RAW:
309 {
310 struct mtd_oob_ops ops;
311
312 ops.mode = MTD_OPS_RAW;
313 ops.datbuf = kbuf;
314 ops.oobbuf = NULL;
315 ops.ooboffs = 0;
316 ops.len = len;
317
318 ret = mtd_write_oob(mtd, *ppos, &ops);
319 retlen = ops.retlen;
320 break;
321 }
322
323 default:
324 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
325 }
326 if (!ret) {
327 *ppos += retlen;
328 total_retlen += retlen;
329 count -= retlen;
330 buf += retlen;
331 }
332 else {
333 kfree(kbuf);
334 return ret;
335 }
336 }
337
338 kfree(kbuf);
339 return total_retlen;
340 } /* mtdchar_write */
341
342 /*======================================================================
343
344 IOCTL calls for getting device parameters.
345
346 ======================================================================*/
347 static void mtdchar_erase_callback (struct erase_info *instr)
348 {
349 wake_up((wait_queue_head_t *)instr->priv);
350 }
351
352 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
353 {
354 struct mtd_info *mtd = mfi->mtd;
355 size_t retlen;
356
357 switch (mode) {
358 case MTD_OTP_FACTORY:
359 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
360 -EOPNOTSUPP)
361 return -EOPNOTSUPP;
362
363 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
364 break;
365 case MTD_OTP_USER:
366 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
367 -EOPNOTSUPP)
368 return -EOPNOTSUPP;
369
370 mfi->mode = MTD_FILE_MODE_OTP_USER;
371 break;
372 case MTD_OTP_OFF:
373 mfi->mode = MTD_FILE_MODE_NORMAL;
374 break;
375 default:
376 return -EINVAL;
377 }
378
379 return 0;
380 }
381
382 static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
383 uint64_t start, uint32_t length, void __user *ptr,
384 uint32_t __user *retp)
385 {
386 struct mtd_file_info *mfi = file->private_data;
387 struct mtd_oob_ops ops;
388 uint32_t retlen;
389 int ret = 0;
390
391 if (!(file->f_mode & FMODE_WRITE))
392 return -EPERM;
393
394 if (length > 4096)
395 return -EINVAL;
396
397 if (!mtd->_write_oob)
398 ret = -EOPNOTSUPP;
399 else
400 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
401
402 if (ret)
403 return ret;
404
405 ops.ooblen = length;
406 ops.ooboffs = start & (mtd->writesize - 1);
407 ops.datbuf = NULL;
408 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
409 MTD_OPS_PLACE_OOB;
410
411 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
412 return -EINVAL;
413
414 ops.oobbuf = memdup_user(ptr, length);
415 if (IS_ERR(ops.oobbuf))
416 return PTR_ERR(ops.oobbuf);
417
418 start &= ~((uint64_t)mtd->writesize - 1);
419 ret = mtd_write_oob(mtd, start, &ops);
420
421 if (ops.oobretlen > 0xFFFFFFFFU)
422 ret = -EOVERFLOW;
423 retlen = ops.oobretlen;
424 if (copy_to_user(retp, &retlen, sizeof(length)))
425 ret = -EFAULT;
426
427 kfree(ops.oobbuf);
428 return ret;
429 }
430
431 static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
432 uint64_t start, uint32_t length, void __user *ptr,
433 uint32_t __user *retp)
434 {
435 struct mtd_file_info *mfi = file->private_data;
436 struct mtd_oob_ops ops;
437 int ret = 0;
438
439 if (length > 4096)
440 return -EINVAL;
441
442 if (!access_ok(VERIFY_WRITE, ptr, length))
443 return -EFAULT;
444
445 ops.ooblen = length;
446 ops.ooboffs = start & (mtd->writesize - 1);
447 ops.datbuf = NULL;
448 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
449 MTD_OPS_PLACE_OOB;
450
451 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
452 return -EINVAL;
453
454 ops.oobbuf = kmalloc(length, GFP_KERNEL);
455 if (!ops.oobbuf)
456 return -ENOMEM;
457
458 start &= ~((uint64_t)mtd->writesize - 1);
459 ret = mtd_read_oob(mtd, start, &ops);
460
461 if (put_user(ops.oobretlen, retp))
462 ret = -EFAULT;
463 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
464 ops.oobretlen))
465 ret = -EFAULT;
466
467 kfree(ops.oobbuf);
468
469 /*
470 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
471 * data. For our userspace tools it is important to dump areas
472 * with ECC errors!
473 * For kernel internal usage it also might return -EUCLEAN
474 * to signal the caller that a bitflip has occured and has
475 * been corrected by the ECC algorithm.
476 *
477 * Note: currently the standard NAND function, nand_read_oob_std,
478 * does not calculate ECC for the OOB area, so do not rely on
479 * this behavior unless you have replaced it with your own.
480 */
481 if (mtd_is_bitflip_or_eccerr(ret))
482 return 0;
483
484 return ret;
485 }
486
487 /*
488 * Copies (and truncates, if necessary) data from the larger struct,
489 * nand_ecclayout, to the smaller, deprecated layout struct,
490 * nand_ecclayout_user. This is necessary only to support the deprecated
491 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
492 * nand_ecclayout flexibly (i.e. the struct may change size in new
493 * releases without requiring major rewrites).
494 */
495 static int shrink_ecclayout(const struct nand_ecclayout *from,
496 struct nand_ecclayout_user *to)
497 {
498 int i;
499
500 if (!from || !to)
501 return -EINVAL;
502
503 memset(to, 0, sizeof(*to));
504
505 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
506 for (i = 0; i < to->eccbytes; i++)
507 to->eccpos[i] = from->eccpos[i];
508
509 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
510 if (from->oobfree[i].length == 0 &&
511 from->oobfree[i].offset == 0)
512 break;
513 to->oobavail += from->oobfree[i].length;
514 to->oobfree[i] = from->oobfree[i];
515 }
516
517 return 0;
518 }
519
520 static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
521 struct blkpg_ioctl_arg __user *arg)
522 {
523 struct blkpg_ioctl_arg a;
524 struct blkpg_partition p;
525
526 if (!capable(CAP_SYS_ADMIN))
527 return -EPERM;
528
529 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
530 return -EFAULT;
531
532 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
533 return -EFAULT;
534
535 switch (a.op) {
536 case BLKPG_ADD_PARTITION:
537
538 /* Only master mtd device must be used to add partitions */
539 if (mtd_is_partition(mtd))
540 return -EINVAL;
541
542 return mtd_add_partition(mtd, p.devname, p.start, p.length);
543
544 case BLKPG_DEL_PARTITION:
545
546 if (p.pno < 0)
547 return -EINVAL;
548
549 return mtd_del_partition(mtd, p.pno);
550
551 default:
552 return -EINVAL;
553 }
554 }
555
556 static int mtdchar_write_ioctl(struct mtd_info *mtd,
557 struct mtd_write_req __user *argp)
558 {
559 struct mtd_write_req req;
560 struct mtd_oob_ops ops;
561 void __user *usr_data, *usr_oob;
562 int ret;
563
564 if (copy_from_user(&req, argp, sizeof(req)) ||
565 !access_ok(VERIFY_READ, req.usr_data, req.len) ||
566 !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
567 return -EFAULT;
568 if (!mtd->_write_oob)
569 return -EOPNOTSUPP;
570
571 ops.mode = req.mode;
572 ops.len = (size_t)req.len;
573 ops.ooblen = (size_t)req.ooblen;
574 ops.ooboffs = 0;
575
576 usr_data = (void __user *)(uintptr_t)req.usr_data;
577 usr_oob = (void __user *)(uintptr_t)req.usr_oob;
578
579 if (req.usr_data) {
580 ops.datbuf = memdup_user(usr_data, ops.len);
581 if (IS_ERR(ops.datbuf))
582 return PTR_ERR(ops.datbuf);
583 } else {
584 ops.datbuf = NULL;
585 }
586
587 if (req.usr_oob) {
588 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
589 if (IS_ERR(ops.oobbuf)) {
590 kfree(ops.datbuf);
591 return PTR_ERR(ops.oobbuf);
592 }
593 } else {
594 ops.oobbuf = NULL;
595 }
596
597 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
598
599 kfree(ops.datbuf);
600 kfree(ops.oobbuf);
601
602 return ret;
603 }
604
605 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
606 {
607 struct mtd_file_info *mfi = file->private_data;
608 struct mtd_info *mtd = mfi->mtd;
609 void __user *argp = (void __user *)arg;
610 int ret = 0;
611 u_long size;
612 struct mtd_info_user info;
613
614 pr_debug("MTD_ioctl\n");
615
616 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
617 if (cmd & IOC_IN) {
618 if (!access_ok(VERIFY_READ, argp, size))
619 return -EFAULT;
620 }
621 if (cmd & IOC_OUT) {
622 if (!access_ok(VERIFY_WRITE, argp, size))
623 return -EFAULT;
624 }
625
626 switch (cmd) {
627 case MEMGETREGIONCOUNT:
628 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
629 return -EFAULT;
630 break;
631
632 case MEMGETREGIONINFO:
633 {
634 uint32_t ur_idx;
635 struct mtd_erase_region_info *kr;
636 struct region_info_user __user *ur = argp;
637
638 if (get_user(ur_idx, &(ur->regionindex)))
639 return -EFAULT;
640
641 if (ur_idx >= mtd->numeraseregions)
642 return -EINVAL;
643
644 kr = &(mtd->eraseregions[ur_idx]);
645
646 if (put_user(kr->offset, &(ur->offset))
647 || put_user(kr->erasesize, &(ur->erasesize))
648 || put_user(kr->numblocks, &(ur->numblocks)))
649 return -EFAULT;
650
651 break;
652 }
653
654 case MEMGETINFO:
655 memset(&info, 0, sizeof(info));
656 info.type = mtd->type;
657 info.flags = mtd->flags;
658 info.size = mtd->size;
659 info.erasesize = mtd->erasesize;
660 info.writesize = mtd->writesize;
661 info.oobsize = mtd->oobsize;
662 /* The below field is obsolete */
663 info.padding = 0;
664 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
665 return -EFAULT;
666 break;
667
668 case MEMERASE:
669 case MEMERASE64:
670 {
671 struct erase_info *erase;
672
673 if(!(file->f_mode & FMODE_WRITE))
674 return -EPERM;
675
676 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
677 if (!erase)
678 ret = -ENOMEM;
679 else {
680 wait_queue_head_t waitq;
681 DECLARE_WAITQUEUE(wait, current);
682
683 init_waitqueue_head(&waitq);
684
685 if (cmd == MEMERASE64) {
686 struct erase_info_user64 einfo64;
687
688 if (copy_from_user(&einfo64, argp,
689 sizeof(struct erase_info_user64))) {
690 kfree(erase);
691 return -EFAULT;
692 }
693 erase->addr = einfo64.start;
694 erase->len = einfo64.length;
695 } else {
696 struct erase_info_user einfo32;
697
698 if (copy_from_user(&einfo32, argp,
699 sizeof(struct erase_info_user))) {
700 kfree(erase);
701 return -EFAULT;
702 }
703 erase->addr = einfo32.start;
704 erase->len = einfo32.length;
705 }
706 erase->mtd = mtd;
707 erase->callback = mtdchar_erase_callback;
708 erase->priv = (unsigned long)&waitq;
709
710 /*
711 FIXME: Allow INTERRUPTIBLE. Which means
712 not having the wait_queue head on the stack.
713
714 If the wq_head is on the stack, and we
715 leave because we got interrupted, then the
716 wq_head is no longer there when the
717 callback routine tries to wake us up.
718 */
719 ret = mtd_erase(mtd, erase);
720 if (!ret) {
721 set_current_state(TASK_UNINTERRUPTIBLE);
722 add_wait_queue(&waitq, &wait);
723 if (erase->state != MTD_ERASE_DONE &&
724 erase->state != MTD_ERASE_FAILED)
725 schedule();
726 remove_wait_queue(&waitq, &wait);
727 set_current_state(TASK_RUNNING);
728
729 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
730 }
731 kfree(erase);
732 }
733 break;
734 }
735
736 case MEMWRITEOOB:
737 {
738 struct mtd_oob_buf buf;
739 struct mtd_oob_buf __user *buf_user = argp;
740
741 /* NOTE: writes return length to buf_user->length */
742 if (copy_from_user(&buf, argp, sizeof(buf)))
743 ret = -EFAULT;
744 else
745 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
746 buf.ptr, &buf_user->length);
747 break;
748 }
749
750 case MEMREADOOB:
751 {
752 struct mtd_oob_buf buf;
753 struct mtd_oob_buf __user *buf_user = argp;
754
755 /* NOTE: writes return length to buf_user->start */
756 if (copy_from_user(&buf, argp, sizeof(buf)))
757 ret = -EFAULT;
758 else
759 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
760 buf.ptr, &buf_user->start);
761 break;
762 }
763
764 case MEMWRITEOOB64:
765 {
766 struct mtd_oob_buf64 buf;
767 struct mtd_oob_buf64 __user *buf_user = argp;
768
769 if (copy_from_user(&buf, argp, sizeof(buf)))
770 ret = -EFAULT;
771 else
772 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
773 (void __user *)(uintptr_t)buf.usr_ptr,
774 &buf_user->length);
775 break;
776 }
777
778 case MEMREADOOB64:
779 {
780 struct mtd_oob_buf64 buf;
781 struct mtd_oob_buf64 __user *buf_user = argp;
782
783 if (copy_from_user(&buf, argp, sizeof(buf)))
784 ret = -EFAULT;
785 else
786 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
787 (void __user *)(uintptr_t)buf.usr_ptr,
788 &buf_user->length);
789 break;
790 }
791
792 case MEMWRITE:
793 {
794 ret = mtdchar_write_ioctl(mtd,
795 (struct mtd_write_req __user *)arg);
796 break;
797 }
798
799 case MEMLOCK:
800 {
801 struct erase_info_user einfo;
802
803 if (copy_from_user(&einfo, argp, sizeof(einfo)))
804 return -EFAULT;
805
806 ret = mtd_lock(mtd, einfo.start, einfo.length);
807 break;
808 }
809
810 case MEMUNLOCK:
811 {
812 struct erase_info_user einfo;
813
814 if (copy_from_user(&einfo, argp, sizeof(einfo)))
815 return -EFAULT;
816
817 ret = mtd_unlock(mtd, einfo.start, einfo.length);
818 break;
819 }
820
821 case MEMISLOCKED:
822 {
823 struct erase_info_user einfo;
824
825 if (copy_from_user(&einfo, argp, sizeof(einfo)))
826 return -EFAULT;
827
828 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
829 break;
830 }
831
832 /* Legacy interface */
833 case MEMGETOOBSEL:
834 {
835 struct nand_oobinfo oi;
836
837 if (!mtd->ecclayout)
838 return -EOPNOTSUPP;
839 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
840 return -EINVAL;
841
842 oi.useecc = MTD_NANDECC_AUTOPLACE;
843 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
844 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
845 sizeof(oi.oobfree));
846 oi.eccbytes = mtd->ecclayout->eccbytes;
847
848 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
849 return -EFAULT;
850 break;
851 }
852
853 case MEMGETBADBLOCK:
854 {
855 loff_t offs;
856
857 if (copy_from_user(&offs, argp, sizeof(loff_t)))
858 return -EFAULT;
859 return mtd_block_isbad(mtd, offs);
860 break;
861 }
862
863 case MEMSETBADBLOCK:
864 {
865 loff_t offs;
866
867 if (copy_from_user(&offs, argp, sizeof(loff_t)))
868 return -EFAULT;
869 return mtd_block_markbad(mtd, offs);
870 break;
871 }
872
873 case OTPSELECT:
874 {
875 int mode;
876 if (copy_from_user(&mode, argp, sizeof(int)))
877 return -EFAULT;
878
879 mfi->mode = MTD_FILE_MODE_NORMAL;
880
881 ret = otp_select_filemode(mfi, mode);
882
883 file->f_pos = 0;
884 break;
885 }
886
887 case OTPGETREGIONCOUNT:
888 case OTPGETREGIONINFO:
889 {
890 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
891 if (!buf)
892 return -ENOMEM;
893 switch (mfi->mode) {
894 case MTD_FILE_MODE_OTP_FACTORY:
895 ret = mtd_get_fact_prot_info(mtd, buf, 4096);
896 break;
897 case MTD_FILE_MODE_OTP_USER:
898 ret = mtd_get_user_prot_info(mtd, buf, 4096);
899 break;
900 default:
901 ret = -EINVAL;
902 break;
903 }
904 if (ret >= 0) {
905 if (cmd == OTPGETREGIONCOUNT) {
906 int nbr = ret / sizeof(struct otp_info);
907 ret = copy_to_user(argp, &nbr, sizeof(int));
908 } else
909 ret = copy_to_user(argp, buf, ret);
910 if (ret)
911 ret = -EFAULT;
912 }
913 kfree(buf);
914 break;
915 }
916
917 case OTPLOCK:
918 {
919 struct otp_info oinfo;
920
921 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
922 return -EINVAL;
923 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
924 return -EFAULT;
925 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
926 break;
927 }
928
929 /* This ioctl is being deprecated - it truncates the ECC layout */
930 case ECCGETLAYOUT:
931 {
932 struct nand_ecclayout_user *usrlay;
933
934 if (!mtd->ecclayout)
935 return -EOPNOTSUPP;
936
937 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
938 if (!usrlay)
939 return -ENOMEM;
940
941 shrink_ecclayout(mtd->ecclayout, usrlay);
942
943 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
944 ret = -EFAULT;
945 kfree(usrlay);
946 break;
947 }
948
949 case ECCGETSTATS:
950 {
951 if (copy_to_user(argp, &mtd->ecc_stats,
952 sizeof(struct mtd_ecc_stats)))
953 return -EFAULT;
954 break;
955 }
956
957 case MTDFILEMODE:
958 {
959 mfi->mode = 0;
960
961 switch(arg) {
962 case MTD_FILE_MODE_OTP_FACTORY:
963 case MTD_FILE_MODE_OTP_USER:
964 ret = otp_select_filemode(mfi, arg);
965 break;
966
967 case MTD_FILE_MODE_RAW:
968 if (!mtd_has_oob(mtd))
969 return -EOPNOTSUPP;
970 mfi->mode = arg;
971
972 case MTD_FILE_MODE_NORMAL:
973 break;
974 default:
975 ret = -EINVAL;
976 }
977 file->f_pos = 0;
978 break;
979 }
980
981 case BLKPG:
982 {
983 ret = mtdchar_blkpg_ioctl(mtd,
984 (struct blkpg_ioctl_arg __user *)arg);
985 break;
986 }
987
988 case BLKRRPART:
989 {
990 /* No reread partition feature. Just return ok */
991 ret = 0;
992 break;
993 }
994
995 default:
996 ret = -ENOTTY;
997 }
998
999 return ret;
1000 } /* memory_ioctl */
1001
1002 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1003 {
1004 int ret;
1005
1006 mutex_lock(&mtd_mutex);
1007 ret = mtdchar_ioctl(file, cmd, arg);
1008 mutex_unlock(&mtd_mutex);
1009
1010 return ret;
1011 }
1012
1013 #ifdef CONFIG_COMPAT
1014
1015 struct mtd_oob_buf32 {
1016 u_int32_t start;
1017 u_int32_t length;
1018 compat_caddr_t ptr; /* unsigned char* */
1019 };
1020
1021 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1022 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1023
1024 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1025 unsigned long arg)
1026 {
1027 struct mtd_file_info *mfi = file->private_data;
1028 struct mtd_info *mtd = mfi->mtd;
1029 void __user *argp = compat_ptr(arg);
1030 int ret = 0;
1031
1032 mutex_lock(&mtd_mutex);
1033
1034 switch (cmd) {
1035 case MEMWRITEOOB32:
1036 {
1037 struct mtd_oob_buf32 buf;
1038 struct mtd_oob_buf32 __user *buf_user = argp;
1039
1040 if (copy_from_user(&buf, argp, sizeof(buf)))
1041 ret = -EFAULT;
1042 else
1043 ret = mtdchar_writeoob(file, mtd, buf.start,
1044 buf.length, compat_ptr(buf.ptr),
1045 &buf_user->length);
1046 break;
1047 }
1048
1049 case MEMREADOOB32:
1050 {
1051 struct mtd_oob_buf32 buf;
1052 struct mtd_oob_buf32 __user *buf_user = argp;
1053
1054 /* NOTE: writes return length to buf->start */
1055 if (copy_from_user(&buf, argp, sizeof(buf)))
1056 ret = -EFAULT;
1057 else
1058 ret = mtdchar_readoob(file, mtd, buf.start,
1059 buf.length, compat_ptr(buf.ptr),
1060 &buf_user->start);
1061 break;
1062 }
1063 default:
1064 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1065 }
1066
1067 mutex_unlock(&mtd_mutex);
1068
1069 return ret;
1070 }
1071
1072 #endif /* CONFIG_COMPAT */
1073
1074 /*
1075 * try to determine where a shared mapping can be made
1076 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1077 * mappings)
1078 */
1079 #ifndef CONFIG_MMU
1080 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1081 unsigned long addr,
1082 unsigned long len,
1083 unsigned long pgoff,
1084 unsigned long flags)
1085 {
1086 struct mtd_file_info *mfi = file->private_data;
1087 struct mtd_info *mtd = mfi->mtd;
1088 unsigned long offset;
1089 int ret;
1090
1091 if (addr != 0)
1092 return (unsigned long) -EINVAL;
1093
1094 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1095 return (unsigned long) -EINVAL;
1096
1097 offset = pgoff << PAGE_SHIFT;
1098 if (offset > mtd->size - len)
1099 return (unsigned long) -EINVAL;
1100
1101 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1102 return ret == -EOPNOTSUPP ? -ENOSYS : ret;
1103 }
1104 #endif
1105
1106 /*
1107 * set up a mapping for shared memory segments
1108 */
1109 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1110 {
1111 #ifdef CONFIG_MMU
1112 struct mtd_file_info *mfi = file->private_data;
1113 struct mtd_info *mtd = mfi->mtd;
1114 struct map_info *map = mtd->priv;
1115
1116 /* This is broken because it assumes the MTD device is map-based
1117 and that mtd->priv is a valid struct map_info. It should be
1118 replaced with something that uses the mtd_get_unmapped_area()
1119 operation properly. */
1120 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1121 #ifdef pgprot_noncached
1122 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1123 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1124 #endif
1125 return vm_iomap_memory(vma, map->phys, map->size);
1126 }
1127 return -ENOSYS;
1128 #else
1129 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1130 #endif
1131 }
1132
1133 static const struct file_operations mtd_fops = {
1134 .owner = THIS_MODULE,
1135 .llseek = mtdchar_lseek,
1136 .read = mtdchar_read,
1137 .write = mtdchar_write,
1138 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1139 #ifdef CONFIG_COMPAT
1140 .compat_ioctl = mtdchar_compat_ioctl,
1141 #endif
1142 .open = mtdchar_open,
1143 .release = mtdchar_close,
1144 .mmap = mtdchar_mmap,
1145 #ifndef CONFIG_MMU
1146 .get_unmapped_area = mtdchar_get_unmapped_area,
1147 #endif
1148 };
1149
1150 static const struct super_operations mtd_ops = {
1151 .drop_inode = generic_delete_inode,
1152 .statfs = simple_statfs,
1153 };
1154
1155 static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1156 int flags, const char *dev_name, void *data)
1157 {
1158 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
1159 }
1160
1161 static struct file_system_type mtd_inodefs_type = {
1162 .name = "mtd_inodefs",
1163 .mount = mtd_inodefs_mount,
1164 .kill_sb = kill_anon_super,
1165 };
1166 MODULE_ALIAS_FS("mtd_inodefs");
1167
1168 int __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 ret = register_filesystem(&mtd_inodefs_type);
1181 if (ret) {
1182 pr_err("Can't register mtd_inodefs filesystem, error %d\n",
1183 ret);
1184 goto err_unregister_chdev;
1185 }
1186
1187 return ret;
1188
1189 err_unregister_chdev:
1190 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1191 return ret;
1192 }
1193
1194 void __exit cleanup_mtdchar(void)
1195 {
1196 unregister_filesystem(&mtd_inodefs_type);
1197 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1198 }
1199
1200 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
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