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GUI: Fix Tomato RAF theme for all builds. Compilation typo.
[tomato.git] / release / src-rt-6.x.4708 / linux / linux-2.6.36 / drivers / mtd / mtdchar.c
blobee4714167b4bd8b24d787372284b07e9c2994f7f
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/smp_lock.h>
30 #include <linux/backing-dev.h>
31 #include <linux/compat.h>
32 #include <linux/mount.h>
33
34 #include <linux/mtd/mtd.h>
35 #include <linux/mtd/map.h>
36
37 #include <asm/uaccess.h>
38
39 #define MTD_INODE_FS_MAGIC 0x11307854
40 static struct vfsmount *mtd_inode_mnt __read_mostly;
41
42 /*
43 * Data structure to hold the pointer to the mtd device as well
44 * as mode information ofr various use cases.
45 */
46 struct mtd_file_info {
47 struct mtd_info *mtd;
48 struct inode *ino;
49 enum mtd_file_modes mode;
50 };
51
52 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
53 {
54 struct mtd_file_info *mfi = file->private_data;
55 struct mtd_info *mtd = mfi->mtd;
56
57 switch (orig) {
58 case SEEK_SET:
59 break;
60 case SEEK_CUR:
61 offset += file->f_pos;
62 break;
63 case SEEK_END:
64 offset += mtd->size;
65 break;
66 default:
67 return -EINVAL;
68 }
69
70 if (offset >= 0 && offset <= mtd->size)
71 return file->f_pos = offset;
72
73 return -EINVAL;
74 }
75
76
77
78 static int mtd_open(struct inode *inode, struct file *file)
79 {
80 int minor = iminor(inode);
81 int devnum = minor >> 1;
82 int ret = 0;
83 struct mtd_info *mtd;
84 struct mtd_file_info *mfi;
85 struct inode *mtd_ino;
86
87 DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
88
89 /* You can't open the RO devices RW */
90 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
91 return -EACCES;
92
93 lock_kernel();
94 mtd = get_mtd_device(NULL, devnum);
95
96 if (IS_ERR(mtd)) {
97 ret = PTR_ERR(mtd);
98 goto out;
99 }
100
101 if (mtd->type == MTD_ABSENT) {
102 put_mtd_device(mtd);
103 ret = -ENODEV;
104 goto out;
105 }
106
107 mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
108 if (!mtd_ino) {
109 put_mtd_device(mtd);
110 ret = -ENOMEM;
111 goto out;
112 }
113 if (mtd_ino->i_state & I_NEW) {
114 mtd_ino->i_private = mtd;
115 mtd_ino->i_mode = S_IFCHR;
116 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
117 unlock_new_inode(mtd_ino);
118 }
119 file->f_mapping = mtd_ino->i_mapping;
120
121 /* You can't open it RW if it's not a writeable device */
122 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
123 iput(mtd_ino);
124 put_mtd_device(mtd);
125 ret = -EACCES;
126 goto out;
127 }
128
129 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
130 if (!mfi) {
131 iput(mtd_ino);
132 put_mtd_device(mtd);
133 ret = -ENOMEM;
134 goto out;
135 }
136 mfi->ino = mtd_ino;
137 mfi->mtd = mtd;
138 file->private_data = mfi;
139
140 out:
141 unlock_kernel();
142 return ret;
143 } /* mtd_open */
144
145 /*====================================================================*/
146
147 static int mtd_close(struct inode *inode, struct file *file)
148 {
149 struct mtd_file_info *mfi = file->private_data;
150 struct mtd_info *mtd = mfi->mtd;
151
152 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
153
154 /* Only sync if opened RW */
155 if ((file->f_mode & FMODE_WRITE) && mtd->sync)
156 mtd->sync(mtd);
157
158 iput(mfi->ino);
159
160 put_mtd_device(mtd);
161 file->private_data = NULL;
162 kfree(mfi);
163
164 return 0;
165 } /* mtd_close */
166
167 #define MAX_KMALLOC_SIZE 0x20000
168
169 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
170 {
171 struct mtd_file_info *mfi = file->private_data;
172 struct mtd_info *mtd = mfi->mtd;
173 size_t retlen=0;
174 size_t total_retlen=0;
175 int ret=0;
176 int len;
177 char *kbuf;
178
179 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
180
181 if (*ppos + count > mtd->size)
182 count = mtd->size - *ppos;
183
184 if (!count)
185 return 0;
186
187
188 if (count > MAX_KMALLOC_SIZE)
189 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
190 else
191 kbuf=kmalloc(count, GFP_KERNEL);
192
193 if (!kbuf)
194 return -ENOMEM;
195
196 while (count) {
197
198 if (count > MAX_KMALLOC_SIZE)
199 len = MAX_KMALLOC_SIZE;
200 else
201 len = count;
202
203 switch (mfi->mode) {
204 case MTD_MODE_OTP_FACTORY:
205 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
206 break;
207 case MTD_MODE_OTP_USER:
208 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
209 break;
210 case MTD_MODE_RAW:
211 {
212 struct mtd_oob_ops ops;
213
214 ops.mode = MTD_OOB_RAW;
215 ops.datbuf = kbuf;
216 ops.oobbuf = NULL;
217 ops.len = len;
218
219 ret = mtd->read_oob(mtd, *ppos, &ops);
220 retlen = ops.retlen;
221 break;
222 }
223 default:
224 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
225 }
226 /* Nand returns -EBADMSG on ecc errors, but it returns
227 * the data. For our userspace tools it is important
228 * to dump areas with ecc errors !
229 * For kernel internal usage it also might return -EUCLEAN
230 * to signal the caller that a bitflip has occured and has
231 * been corrected by the ECC algorithm.
232 * Userspace software which accesses NAND this way
233 * must be aware of the fact that it deals with NAND
234 */
235 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
236 *ppos += retlen;
237 if (copy_to_user(buf, kbuf, retlen)) {
238 kfree(kbuf);
239 return -EFAULT;
240 }
241 else
242 total_retlen += retlen;
243
244 count -= retlen;
245 buf += retlen;
246 if (retlen == 0)
247 count = 0;
248 }
249 else {
250 kfree(kbuf);
251 return ret;
252 }
253
254 }
255
256 kfree(kbuf);
257 return total_retlen;
258 } /* mtd_read */
259
260 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
261 {
262 struct mtd_file_info *mfi = file->private_data;
263 struct mtd_info *mtd = mfi->mtd;
264 char *kbuf;
265 size_t retlen;
266 size_t total_retlen=0;
267 int ret=0;
268 int len;
269
270 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
271
272 if (*ppos == mtd->size)
273 return -ENOSPC;
274
275 if (*ppos + count > mtd->size)
276 count = mtd->size - *ppos;
277
278 if (!count)
279 return 0;
280
281 if (count > MAX_KMALLOC_SIZE)
282 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
283 else
284 kbuf=kmalloc(count, GFP_KERNEL);
285
286 if (!kbuf)
287 return -ENOMEM;
288
289 while (count) {
290
291 if (count > MAX_KMALLOC_SIZE)
292 len = MAX_KMALLOC_SIZE;
293 else
294 len = count;
295
296 if (copy_from_user(kbuf, buf, len)) {
297 kfree(kbuf);
298 return -EFAULT;
299 }
300
301 switch (mfi->mode) {
302 case MTD_MODE_OTP_FACTORY:
303 ret = -EROFS;
304 break;
305 case MTD_MODE_OTP_USER:
306 if (!mtd->write_user_prot_reg) {
307 ret = -EOPNOTSUPP;
308 break;
309 }
310 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
311 break;
312
313 case MTD_MODE_RAW:
314 {
315 struct mtd_oob_ops ops;
316
317 ops.mode = MTD_OOB_RAW;
318 ops.datbuf = kbuf;
319 ops.oobbuf = NULL;
320 ops.len = len;
321
322 ret = mtd->write_oob(mtd, *ppos, &ops);
323 retlen = ops.retlen;
324 break;
325 }
326
327 default:
328 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
329 }
330 if (!ret) {
331 *ppos += retlen;
332 total_retlen += retlen;
333 count -= retlen;
334 buf += retlen;
335 }
336 else {
337 kfree(kbuf);
338 return ret;
339 }
340 }
341
342 kfree(kbuf);
343 return total_retlen;
344 } /* mtd_write */
345
346 /*======================================================================
347
348 IOCTL calls for getting device parameters.
349
350 ======================================================================*/
351 static void mtdchar_erase_callback (struct erase_info *instr)
352 {
353 wake_up((wait_queue_head_t *)instr->priv);
354 }
355
356 #ifdef CONFIG_HAVE_MTD_OTP
357 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
358 {
359 struct mtd_info *mtd = mfi->mtd;
360 int ret = 0;
361
362 switch (mode) {
363 case MTD_OTP_FACTORY:
364 if (!mtd->read_fact_prot_reg)
365 ret = -EOPNOTSUPP;
366 else
367 mfi->mode = MTD_MODE_OTP_FACTORY;
368 break;
369 case MTD_OTP_USER:
370 if (!mtd->read_fact_prot_reg)
371 ret = -EOPNOTSUPP;
372 else
373 mfi->mode = MTD_MODE_OTP_USER;
374 break;
375 default:
376 ret = -EINVAL;
377 case MTD_OTP_OFF:
378 break;
379 }
380 return ret;
381 }
382 #else
383 # define otp_select_filemode(f,m) -EOPNOTSUPP
384 #endif
385
386 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
387 uint64_t start, uint32_t length, void __user *ptr,
388 uint32_t __user *retp)
389 {
390 struct mtd_oob_ops ops;
391 uint32_t retlen;
392 int ret = 0;
393
394 if (!(file->f_mode & FMODE_WRITE))
395 return -EPERM;
396
397 if (length > 4096)
398 return -EINVAL;
399
400 if (!mtd->write_oob)
401 ret = -EOPNOTSUPP;
402 else
403 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
404
405 if (ret)
406 return ret;
407
408 ops.ooblen = length;
409 ops.ooboffs = start & (mtd->oobsize - 1);
410 ops.datbuf = NULL;
411 ops.mode = MTD_OOB_PLACE;
412
413 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
414 return -EINVAL;
415
416 ops.oobbuf = memdup_user(ptr, length);
417 if (IS_ERR(ops.oobbuf))
418 return PTR_ERR(ops.oobbuf);
419
420 start &= ~((uint64_t)mtd->oobsize - 1);
421 ret = mtd->write_oob(mtd, start, &ops);
422
423 if (ops.oobretlen > 0xFFFFFFFFU)
424 ret = -EOVERFLOW;
425 retlen = ops.oobretlen;
426 if (copy_to_user(retp, &retlen, sizeof(length)))
427 ret = -EFAULT;
428
429 kfree(ops.oobbuf);
430 return ret;
431 }
432
433 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
434 uint32_t length, void __user *ptr, uint32_t __user *retp)
435 {
436 struct mtd_oob_ops ops;
437 int ret = 0;
438
439 if (length > 4096)
440 return -EINVAL;
441
442 if (!mtd->read_oob)
443 ret = -EOPNOTSUPP;
444 else
445 ret = access_ok(VERIFY_WRITE, ptr,
446 length) ? 0 : -EFAULT;
447 if (ret)
448 return ret;
449
450 ops.ooblen = length;
451 ops.ooboffs = start & (mtd->oobsize - 1);
452 ops.datbuf = NULL;
453 ops.mode = MTD_OOB_PLACE;
454
455 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
456 return -EINVAL;
457
458 ops.oobbuf = kmalloc(length, GFP_KERNEL);
459 if (!ops.oobbuf)
460 return -ENOMEM;
461
462 start &= ~((uint64_t)mtd->oobsize - 1);
463 ret = mtd->read_oob(mtd, start, &ops);
464
465 if (put_user(ops.oobretlen, retp))
466 ret = -EFAULT;
467 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
468 ops.oobretlen))
469 ret = -EFAULT;
470
471 kfree(ops.oobbuf);
472 return ret;
473 }
474
475 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
476 {
477 struct mtd_file_info *mfi = file->private_data;
478 struct mtd_info *mtd = mfi->mtd;
479 void __user *argp = (void __user *)arg;
480 int ret = 0;
481 u_long size;
482 struct mtd_info_user info;
483
484 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
485
486 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
487 if (cmd & IOC_IN) {
488 if (!access_ok(VERIFY_READ, argp, size))
489 return -EFAULT;
490 }
491 if (cmd & IOC_OUT) {
492 if (!access_ok(VERIFY_WRITE, argp, size))
493 return -EFAULT;
494 }
495
496 switch (cmd) {
497 case MEMGETREGIONCOUNT:
498 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
499 return -EFAULT;
500 break;
501
502 case MEMGETREGIONINFO:
503 {
504 uint32_t ur_idx;
505 struct mtd_erase_region_info *kr;
506 struct region_info_user __user *ur = argp;
507
508 if (get_user(ur_idx, &(ur->regionindex)))
509 return -EFAULT;
510
511 kr = &(mtd->eraseregions[ur_idx]);
512
513 if (put_user(kr->offset, &(ur->offset))
514 || put_user(kr->erasesize, &(ur->erasesize))
515 || put_user(kr->numblocks, &(ur->numblocks)))
516 return -EFAULT;
517
518 break;
519 }
520
521 case MEMGETINFO:
522 info.type = mtd->type;
523 info.flags = mtd->flags;
524 info.size = mtd->size;
525 info.erasesize = mtd->erasesize;
526 info.writesize = mtd->writesize;
527 info.oobsize = mtd->oobsize;
528 /* The below fields are obsolete */
529 info.ecctype = -1;
530 info.eccsize = 0;
531 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
532 return -EFAULT;
533 break;
534
535 case MEMERASE:
536 case MEMERASE64:
537 {
538 struct erase_info *erase;
539
540 if(!(file->f_mode & FMODE_WRITE))
541 return -EPERM;
542
543 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
544 if (!erase)
545 ret = -ENOMEM;
546 else {
547 wait_queue_head_t waitq;
548 DECLARE_WAITQUEUE(wait, current);
549
550 init_waitqueue_head(&waitq);
551
552 if (cmd == MEMERASE64) {
553 struct erase_info_user64 einfo64;
554
555 if (copy_from_user(&einfo64, argp,
556 sizeof(struct erase_info_user64))) {
557 kfree(erase);
558 return -EFAULT;
559 }
560 erase->addr = einfo64.start;
561 erase->len = einfo64.length;
562 } else {
563 struct erase_info_user einfo32;
564
565 if (copy_from_user(&einfo32, argp,
566 sizeof(struct erase_info_user))) {
567 kfree(erase);
568 return -EFAULT;
569 }
570 erase->addr = einfo32.start;
571 erase->len = einfo32.length;
572 }
573 erase->mtd = mtd;
574 erase->callback = mtdchar_erase_callback;
575 erase->priv = (unsigned long)&waitq;
576
577 ret = mtd->erase(mtd, erase);
578 if (!ret) {
579 set_current_state(TASK_UNINTERRUPTIBLE);
580 add_wait_queue(&waitq, &wait);
581 if (erase->state != MTD_ERASE_DONE &&
582 erase->state != MTD_ERASE_FAILED)
583 schedule();
584 remove_wait_queue(&waitq, &wait);
585 set_current_state(TASK_RUNNING);
586
587 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
588 }
589 kfree(erase);
590 }
591 break;
592 }
593
594 case MEMWRITEOOB:
595 {
596 struct mtd_oob_buf buf;
597 struct mtd_oob_buf __user *buf_user = argp;
598
599 /* NOTE: writes return length to buf_user->length */
600 if (copy_from_user(&buf, argp, sizeof(buf)))
601 ret = -EFAULT;
602 else
603 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
604 buf.ptr, &buf_user->length);
605 break;
606 }
607
608 case MEMREADOOB:
609 {
610 struct mtd_oob_buf buf;
611 struct mtd_oob_buf __user *buf_user = argp;
612
613 /* NOTE: writes return length to buf_user->start */
614 if (copy_from_user(&buf, argp, sizeof(buf)))
615 ret = -EFAULT;
616 else
617 ret = mtd_do_readoob(mtd, buf.start, buf.length,
618 buf.ptr, &buf_user->start);
619 break;
620 }
621
622 case MEMWRITEOOB64:
623 {
624 struct mtd_oob_buf64 buf;
625 struct mtd_oob_buf64 __user *buf_user = argp;
626
627 if (copy_from_user(&buf, argp, sizeof(buf)))
628 ret = -EFAULT;
629 else
630 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
631 (void __user *)(uintptr_t)buf.usr_ptr,
632 &buf_user->length);
633 break;
634 }
635
636 case MEMREADOOB64:
637 {
638 struct mtd_oob_buf64 buf;
639 struct mtd_oob_buf64 __user *buf_user = argp;
640
641 if (copy_from_user(&buf, argp, sizeof(buf)))
642 ret = -EFAULT;
643 else
644 ret = mtd_do_readoob(mtd, buf.start, buf.length,
645 (void __user *)(uintptr_t)buf.usr_ptr,
646 &buf_user->length);
647 break;
648 }
649
650 case MEMLOCK:
651 {
652 struct erase_info_user einfo;
653
654 if (copy_from_user(&einfo, argp, sizeof(einfo)))
655 return -EFAULT;
656
657 if (!mtd->lock)
658 ret = -EOPNOTSUPP;
659 else
660 ret = mtd->lock(mtd, einfo.start, einfo.length);
661 break;
662 }
663
664 case MEMUNLOCK:
665 {
666 struct erase_info_user einfo;
667
668 if (copy_from_user(&einfo, argp, sizeof(einfo)))
669 return -EFAULT;
670
671 if (!mtd->unlock)
672 ret = -EOPNOTSUPP;
673 else
674 ret = mtd->unlock(mtd, einfo.start, einfo.length);
675 break;
676 }
677
678 case MEMISLOCKED:
679 {
680 struct erase_info_user einfo;
681
682 if (copy_from_user(&einfo, argp, sizeof(einfo)))
683 return -EFAULT;
684
685 if (!mtd->is_locked)
686 ret = -EOPNOTSUPP;
687 else
688 ret = mtd->is_locked(mtd, einfo.start, einfo.length);
689 break;
690 }
691
692 /* Legacy interface */
693 case MEMGETOOBSEL:
694 {
695 struct nand_oobinfo oi;
696
697 if (!mtd->ecclayout)
698 return -EOPNOTSUPP;
699 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
700 return -EINVAL;
701
702 oi.useecc = MTD_NANDECC_AUTOPLACE;
703 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
704 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
705 sizeof(oi.oobfree));
706 oi.eccbytes = mtd->ecclayout->eccbytes;
707
708 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
709 return -EFAULT;
710 break;
711 }
712
713 case MEMGETBADBLOCK:
714 {
715 loff_t offs;
716
717 if (copy_from_user(&offs, argp, sizeof(loff_t)))
718 return -EFAULT;
719 if (!mtd->block_isbad)
720 ret = -EOPNOTSUPP;
721 else
722 return mtd->block_isbad(mtd, offs);
723 break;
724 }
725
726 case MEMSETBADBLOCK:
727 {
728 loff_t offs;
729
730 if (copy_from_user(&offs, argp, sizeof(loff_t)))
731 return -EFAULT;
732 if (!mtd->block_markbad)
733 ret = -EOPNOTSUPP;
734 else
735 return mtd->block_markbad(mtd, offs);
736 break;
737 }
738
739 #ifdef CONFIG_HAVE_MTD_OTP
740 case OTPSELECT:
741 {
742 int mode;
743 if (copy_from_user(&mode, argp, sizeof(int)))
744 return -EFAULT;
745
746 mfi->mode = MTD_MODE_NORMAL;
747
748 ret = otp_select_filemode(mfi, mode);
749
750 file->f_pos = 0;
751 break;
752 }
753
754 case OTPGETREGIONCOUNT:
755 case OTPGETREGIONINFO:
756 {
757 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
758 if (!buf)
759 return -ENOMEM;
760 ret = -EOPNOTSUPP;
761 switch (mfi->mode) {
762 case MTD_MODE_OTP_FACTORY:
763 if (mtd->get_fact_prot_info)
764 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
765 break;
766 case MTD_MODE_OTP_USER:
767 if (mtd->get_user_prot_info)
768 ret = mtd->get_user_prot_info(mtd, buf, 4096);
769 break;
770 default:
771 break;
772 }
773 if (ret >= 0) {
774 if (cmd == OTPGETREGIONCOUNT) {
775 int nbr = ret / sizeof(struct otp_info);
776 ret = copy_to_user(argp, &nbr, sizeof(int));
777 } else
778 ret = copy_to_user(argp, buf, ret);
779 if (ret)
780 ret = -EFAULT;
781 }
782 kfree(buf);
783 break;
784 }
785
786 case OTPLOCK:
787 {
788 struct otp_info oinfo;
789
790 if (mfi->mode != MTD_MODE_OTP_USER)
791 return -EINVAL;
792 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
793 return -EFAULT;
794 if (!mtd->lock_user_prot_reg)
795 return -EOPNOTSUPP;
796 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
797 break;
798 }
799 #endif
800
801 case ECCGETLAYOUT:
802 {
803 if (!mtd->ecclayout)
804 return -EOPNOTSUPP;
805
806 if (copy_to_user(argp, mtd->ecclayout,
807 sizeof(struct nand_ecclayout)))
808 return -EFAULT;
809 break;
810 }
811
812 case ECCGETSTATS:
813 {
814 if (copy_to_user(argp, &mtd->ecc_stats,
815 sizeof(struct mtd_ecc_stats)))
816 return -EFAULT;
817 break;
818 }
819
820 case MTDFILEMODE:
821 {
822 mfi->mode = 0;
823
824 switch(arg) {
825 case MTD_MODE_OTP_FACTORY:
826 case MTD_MODE_OTP_USER:
827 ret = otp_select_filemode(mfi, arg);
828 break;
829
830 case MTD_MODE_RAW:
831 if (!mtd->read_oob || !mtd->write_oob)
832 return -EOPNOTSUPP;
833 mfi->mode = arg;
834
835 case MTD_MODE_NORMAL:
836 break;
837 default:
838 ret = -EINVAL;
839 }
840 file->f_pos = 0;
841 break;
842 }
843
844 default:
845 ret = -ENOTTY;
846 }
847
848 return ret;
849 } /* memory_ioctl */
850
851 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
852 {
853 int ret;
854
855 lock_kernel();
856 ret = mtd_ioctl(file, cmd, arg);
857 unlock_kernel();
858
859 return ret;
860 }
861
862 #ifdef CONFIG_COMPAT
863
864 struct mtd_oob_buf32 {
865 u_int32_t start;
866 u_int32_t length;
867 compat_caddr_t ptr; /* unsigned char* */
868 };
869
870 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
871 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
872
873 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
874 unsigned long arg)
875 {
876 struct mtd_file_info *mfi = file->private_data;
877 struct mtd_info *mtd = mfi->mtd;
878 void __user *argp = compat_ptr(arg);
879 int ret = 0;
880
881 lock_kernel();
882
883 switch (cmd) {
884 case MEMWRITEOOB32:
885 {
886 struct mtd_oob_buf32 buf;
887 struct mtd_oob_buf32 __user *buf_user = argp;
888
889 if (copy_from_user(&buf, argp, sizeof(buf)))
890 ret = -EFAULT;
891 else
892 ret = mtd_do_writeoob(file, mtd, buf.start,
893 buf.length, compat_ptr(buf.ptr),
894 &buf_user->length);
895 break;
896 }
897
898 case MEMREADOOB32:
899 {
900 struct mtd_oob_buf32 buf;
901 struct mtd_oob_buf32 __user *buf_user = argp;
902
903 /* NOTE: writes return length to buf->start */
904 if (copy_from_user(&buf, argp, sizeof(buf)))
905 ret = -EFAULT;
906 else
907 ret = mtd_do_readoob(mtd, buf.start,
908 buf.length, compat_ptr(buf.ptr),
909 &buf_user->start);
910 break;
911 }
912 default:
913 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
914 }
915
916 unlock_kernel();
917
918 return ret;
919 }
920
921 #endif /* CONFIG_COMPAT */
922
923 /*
924 * try to determine where a shared mapping can be made
925 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
926 * mappings)
927 */
928 #ifndef CONFIG_MMU
929 static unsigned long mtd_get_unmapped_area(struct file *file,
930 unsigned long addr,
931 unsigned long len,
932 unsigned long pgoff,
933 unsigned long flags)
934 {
935 struct mtd_file_info *mfi = file->private_data;
936 struct mtd_info *mtd = mfi->mtd;
937
938 if (mtd->get_unmapped_area) {
939 unsigned long offset;
940
941 if (addr != 0)
942 return (unsigned long) -EINVAL;
943
944 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
945 return (unsigned long) -EINVAL;
946
947 offset = pgoff << PAGE_SHIFT;
948 if (offset > mtd->size - len)
949 return (unsigned long) -EINVAL;
950
951 return mtd->get_unmapped_area(mtd, len, offset, flags);
952 }
953
954 /* can't map directly */
955 return (unsigned long) -ENOSYS;
956 }
957 #endif
958
959 /*
960 * set up a mapping for shared memory segments
961 */
962 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
963 {
964 #ifdef CONFIG_MMU
965 struct mtd_file_info *mfi = file->private_data;
966 struct mtd_info *mtd = mfi->mtd;
967 struct map_info *map = mtd->priv;
968 unsigned long start;
969 unsigned long off;
970 u32 len;
971
972 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
973 off = vma->vm_pgoff << PAGE_SHIFT;
974 start = map->phys;
975 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
976 start &= PAGE_MASK;
977 if ((vma->vm_end - vma->vm_start + off) > len)
978 return -EINVAL;
979
980 off += start;
981 vma->vm_pgoff = off >> PAGE_SHIFT;
982 vma->vm_flags |= VM_IO | VM_RESERVED;
983
984 #ifdef pgprot_noncached
985 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
986 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
987 #endif
988 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
989 vma->vm_end - vma->vm_start,
990 vma->vm_page_prot))
991 return -EAGAIN;
992
993 return 0;
994 }
995 return -ENOSYS;
996 #else
997 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
998 #endif
999 }
1000
1001 static const struct file_operations mtd_fops = {
1002 .owner = THIS_MODULE,
1003 .llseek = mtd_lseek,
1004 .read = mtd_read,
1005 .write = mtd_write,
1006 .unlocked_ioctl = mtd_unlocked_ioctl,
1007 #ifdef CONFIG_COMPAT
1008 .compat_ioctl = mtd_compat_ioctl,
1009 #endif
1010 .open = mtd_open,
1011 .release = mtd_close,
1012 .mmap = mtd_mmap,
1013 #ifndef CONFIG_MMU
1014 .get_unmapped_area = mtd_get_unmapped_area,
1015 #endif
1016 };
1017
1018 static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags,
1019 const char *dev_name, void *data,
1020 struct vfsmount *mnt)
1021 {
1022 return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
1023 mnt);
1024 }
1025
1026 static struct file_system_type mtd_inodefs_type = {
1027 .name = "mtd_inodefs",
1028 .get_sb = mtd_inodefs_get_sb,
1029 .kill_sb = kill_anon_super,
1030 };
1031
1032 static void mtdchar_notify_add(struct mtd_info *mtd)
1033 {
1034 }
1035
1036 static void mtdchar_notify_remove(struct mtd_info *mtd)
1037 {
1038 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1039
1040 if (mtd_ino) {
1041 /* Destroy the inode if it exists */
1042 mtd_ino->i_nlink = 0;
1043 iput(mtd_ino);
1044 }
1045 }
1046
1047 static struct mtd_notifier mtdchar_notifier = {
1048 .add = mtdchar_notify_add,
1049 .remove = mtdchar_notify_remove,
1050 };
1051
1052 static int __init init_mtdchar(void)
1053 {
1054 int ret;
1055
1056 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1057 "mtd", &mtd_fops);
1058 if (ret < 0) {
1059 pr_notice("Can't allocate major number %d for "
1060 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1061 return ret;
1062 }
1063
1064 ret = register_filesystem(&mtd_inodefs_type);
1065 if (ret) {
1066 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1067 goto err_unregister_chdev;
1068 }
1069
1070 mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1071 if (IS_ERR(mtd_inode_mnt)) {
1072 ret = PTR_ERR(mtd_inode_mnt);
1073 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1074 goto err_unregister_filesystem;
1075 }
1076 register_mtd_user(&mtdchar_notifier);
1077
1078 return ret;
1079
1080 err_unregister_filesystem:
1081 unregister_filesystem(&mtd_inodefs_type);
1082 err_unregister_chdev:
1083 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1084 return ret;
1085 }
1086
1087 static void __exit cleanup_mtdchar(void)
1088 {
1089 unregister_mtd_user(&mtdchar_notifier);
1090 mntput(mtd_inode_mnt);
1091 unregister_filesystem(&mtd_inodefs_type);
1092 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1093 }
1094
1095 module_init(init_mtdchar);
1096 module_exit(cleanup_mtdchar);
1097
1098 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1099
1100 MODULE_LICENSE("GPL");
1101 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1102 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1103 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Tomato firmware and modifications.