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staging: hv: Convert camel cased function names in channel_interface.c to lower cases
[linux/fpc-iii.git] / drivers / mtd / mtdchar.c
bloba825002123c84bc0a24ce26e00400be277b09c22
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 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
168 userspace buffer down and use it directly with readv/writev.
169 */
170 #define MAX_KMALLOC_SIZE 0x20000
171
172 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
173 {
174 struct mtd_file_info *mfi = file->private_data;
175 struct mtd_info *mtd = mfi->mtd;
176 size_t retlen=0;
177 size_t total_retlen=0;
178 int ret=0;
179 int len;
180 char *kbuf;
181
182 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
183
184 if (*ppos + count > mtd->size)
185 count = mtd->size - *ppos;
186
187 if (!count)
188 return 0;
189
190 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
191 and pass them directly to the MTD functions */
192
193 if (count > MAX_KMALLOC_SIZE)
194 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
195 else
196 kbuf=kmalloc(count, GFP_KERNEL);
197
198 if (!kbuf)
199 return -ENOMEM;
200
201 while (count) {
202
203 if (count > MAX_KMALLOC_SIZE)
204 len = MAX_KMALLOC_SIZE;
205 else
206 len = count;
207
208 switch (mfi->mode) {
209 case MTD_MODE_OTP_FACTORY:
210 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
211 break;
212 case MTD_MODE_OTP_USER:
213 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
214 break;
215 case MTD_MODE_RAW:
216 {
217 struct mtd_oob_ops ops;
218
219 ops.mode = MTD_OOB_RAW;
220 ops.datbuf = kbuf;
221 ops.oobbuf = NULL;
222 ops.len = len;
223
224 ret = mtd->read_oob(mtd, *ppos, &ops);
225 retlen = ops.retlen;
226 break;
227 }
228 default:
229 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
230 }
231 /* Nand returns -EBADMSG on ecc errors, but it returns
232 * the data. For our userspace tools it is important
233 * to dump areas with ecc errors !
234 * For kernel internal usage it also might return -EUCLEAN
235 * to signal the caller that a bitflip has occured and has
236 * been corrected by the ECC algorithm.
237 * Userspace software which accesses NAND this way
238 * must be aware of the fact that it deals with NAND
239 */
240 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
241 *ppos += retlen;
242 if (copy_to_user(buf, kbuf, retlen)) {
243 kfree(kbuf);
244 return -EFAULT;
245 }
246 else
247 total_retlen += retlen;
248
249 count -= retlen;
250 buf += retlen;
251 if (retlen == 0)
252 count = 0;
253 }
254 else {
255 kfree(kbuf);
256 return ret;
257 }
258
259 }
260
261 kfree(kbuf);
262 return total_retlen;
263 } /* mtd_read */
264
265 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
266 {
267 struct mtd_file_info *mfi = file->private_data;
268 struct mtd_info *mtd = mfi->mtd;
269 char *kbuf;
270 size_t retlen;
271 size_t total_retlen=0;
272 int ret=0;
273 int len;
274
275 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
276
277 if (*ppos == mtd->size)
278 return -ENOSPC;
279
280 if (*ppos + count > mtd->size)
281 count = mtd->size - *ppos;
282
283 if (!count)
284 return 0;
285
286 if (count > MAX_KMALLOC_SIZE)
287 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
288 else
289 kbuf=kmalloc(count, GFP_KERNEL);
290
291 if (!kbuf)
292 return -ENOMEM;
293
294 while (count) {
295
296 if (count > MAX_KMALLOC_SIZE)
297 len = MAX_KMALLOC_SIZE;
298 else
299 len = count;
300
301 if (copy_from_user(kbuf, buf, len)) {
302 kfree(kbuf);
303 return -EFAULT;
304 }
305
306 switch (mfi->mode) {
307 case MTD_MODE_OTP_FACTORY:
308 ret = -EROFS;
309 break;
310 case MTD_MODE_OTP_USER:
311 if (!mtd->write_user_prot_reg) {
312 ret = -EOPNOTSUPP;
313 break;
314 }
315 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
316 break;
317
318 case MTD_MODE_RAW:
319 {
320 struct mtd_oob_ops ops;
321
322 ops.mode = MTD_OOB_RAW;
323 ops.datbuf = kbuf;
324 ops.oobbuf = NULL;
325 ops.len = len;
326
327 ret = mtd->write_oob(mtd, *ppos, &ops);
328 retlen = ops.retlen;
329 break;
330 }
331
332 default:
333 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
334 }
335 if (!ret) {
336 *ppos += retlen;
337 total_retlen += retlen;
338 count -= retlen;
339 buf += retlen;
340 }
341 else {
342 kfree(kbuf);
343 return ret;
344 }
345 }
346
347 kfree(kbuf);
348 return total_retlen;
349 } /* mtd_write */
350
351 /*======================================================================
352
353 IOCTL calls for getting device parameters.
354
355 ======================================================================*/
356 static void mtdchar_erase_callback (struct erase_info *instr)
357 {
358 wake_up((wait_queue_head_t *)instr->priv);
359 }
360
361 #ifdef CONFIG_HAVE_MTD_OTP
362 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
363 {
364 struct mtd_info *mtd = mfi->mtd;
365 int ret = 0;
366
367 switch (mode) {
368 case MTD_OTP_FACTORY:
369 if (!mtd->read_fact_prot_reg)
370 ret = -EOPNOTSUPP;
371 else
372 mfi->mode = MTD_MODE_OTP_FACTORY;
373 break;
374 case MTD_OTP_USER:
375 if (!mtd->read_fact_prot_reg)
376 ret = -EOPNOTSUPP;
377 else
378 mfi->mode = MTD_MODE_OTP_USER;
379 break;
380 default:
381 ret = -EINVAL;
382 case MTD_OTP_OFF:
383 break;
384 }
385 return ret;
386 }
387 #else
388 # define otp_select_filemode(f,m) -EOPNOTSUPP
389 #endif
390
391 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
392 uint64_t start, uint32_t length, void __user *ptr,
393 uint32_t __user *retp)
394 {
395 struct mtd_oob_ops ops;
396 uint32_t retlen;
397 int ret = 0;
398
399 if (!(file->f_mode & FMODE_WRITE))
400 return -EPERM;
401
402 if (length > 4096)
403 return -EINVAL;
404
405 if (!mtd->write_oob)
406 ret = -EOPNOTSUPP;
407 else
408 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
409
410 if (ret)
411 return ret;
412
413 ops.ooblen = length;
414 ops.ooboffs = start & (mtd->oobsize - 1);
415 ops.datbuf = NULL;
416 ops.mode = MTD_OOB_PLACE;
417
418 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
419 return -EINVAL;
420
421 ops.oobbuf = memdup_user(ptr, length);
422 if (IS_ERR(ops.oobbuf))
423 return PTR_ERR(ops.oobbuf);
424
425 start &= ~((uint64_t)mtd->oobsize - 1);
426 ret = mtd->write_oob(mtd, start, &ops);
427
428 if (ops.oobretlen > 0xFFFFFFFFU)
429 ret = -EOVERFLOW;
430 retlen = ops.oobretlen;
431 if (copy_to_user(retp, &retlen, sizeof(length)))
432 ret = -EFAULT;
433
434 kfree(ops.oobbuf);
435 return ret;
436 }
437
438 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
439 uint32_t length, void __user *ptr, uint32_t __user *retp)
440 {
441 struct mtd_oob_ops ops;
442 int ret = 0;
443
444 if (length > 4096)
445 return -EINVAL;
446
447 if (!mtd->read_oob)
448 ret = -EOPNOTSUPP;
449 else
450 ret = access_ok(VERIFY_WRITE, ptr,
451 length) ? 0 : -EFAULT;
452 if (ret)
453 return ret;
454
455 ops.ooblen = length;
456 ops.ooboffs = start & (mtd->oobsize - 1);
457 ops.datbuf = NULL;
458 ops.mode = MTD_OOB_PLACE;
459
460 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
461 return -EINVAL;
462
463 ops.oobbuf = kmalloc(length, GFP_KERNEL);
464 if (!ops.oobbuf)
465 return -ENOMEM;
466
467 start &= ~((uint64_t)mtd->oobsize - 1);
468 ret = mtd->read_oob(mtd, start, &ops);
469
470 if (put_user(ops.oobretlen, retp))
471 ret = -EFAULT;
472 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
473 ops.oobretlen))
474 ret = -EFAULT;
475
476 kfree(ops.oobbuf);
477 return ret;
478 }
479
480 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
481 {
482 struct mtd_file_info *mfi = file->private_data;
483 struct mtd_info *mtd = mfi->mtd;
484 void __user *argp = (void __user *)arg;
485 int ret = 0;
486 u_long size;
487 struct mtd_info_user info;
488
489 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
490
491 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
492 if (cmd & IOC_IN) {
493 if (!access_ok(VERIFY_READ, argp, size))
494 return -EFAULT;
495 }
496 if (cmd & IOC_OUT) {
497 if (!access_ok(VERIFY_WRITE, argp, size))
498 return -EFAULT;
499 }
500
501 switch (cmd) {
502 case MEMGETREGIONCOUNT:
503 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
504 return -EFAULT;
505 break;
506
507 case MEMGETREGIONINFO:
508 {
509 uint32_t ur_idx;
510 struct mtd_erase_region_info *kr;
511 struct region_info_user __user *ur = argp;
512
513 if (get_user(ur_idx, &(ur->regionindex)))
514 return -EFAULT;
515
516 kr = &(mtd->eraseregions[ur_idx]);
517
518 if (put_user(kr->offset, &(ur->offset))
519 || put_user(kr->erasesize, &(ur->erasesize))
520 || put_user(kr->numblocks, &(ur->numblocks)))
521 return -EFAULT;
522
523 break;
524 }
525
526 case MEMGETINFO:
527 info.type = mtd->type;
528 info.flags = mtd->flags;
529 info.size = mtd->size;
530 info.erasesize = mtd->erasesize;
531 info.writesize = mtd->writesize;
532 info.oobsize = mtd->oobsize;
533 /* The below fields are obsolete */
534 info.ecctype = -1;
535 info.eccsize = 0;
536 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
537 return -EFAULT;
538 break;
539
540 case MEMERASE:
541 case MEMERASE64:
542 {
543 struct erase_info *erase;
544
545 if(!(file->f_mode & FMODE_WRITE))
546 return -EPERM;
547
548 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
549 if (!erase)
550 ret = -ENOMEM;
551 else {
552 wait_queue_head_t waitq;
553 DECLARE_WAITQUEUE(wait, current);
554
555 init_waitqueue_head(&waitq);
556
557 if (cmd == MEMERASE64) {
558 struct erase_info_user64 einfo64;
559
560 if (copy_from_user(&einfo64, argp,
561 sizeof(struct erase_info_user64))) {
562 kfree(erase);
563 return -EFAULT;
564 }
565 erase->addr = einfo64.start;
566 erase->len = einfo64.length;
567 } else {
568 struct erase_info_user einfo32;
569
570 if (copy_from_user(&einfo32, argp,
571 sizeof(struct erase_info_user))) {
572 kfree(erase);
573 return -EFAULT;
574 }
575 erase->addr = einfo32.start;
576 erase->len = einfo32.length;
577 }
578 erase->mtd = mtd;
579 erase->callback = mtdchar_erase_callback;
580 erase->priv = (unsigned long)&waitq;
581
582 /*
583 FIXME: Allow INTERRUPTIBLE. Which means
584 not having the wait_queue head on the stack.
585
586 If the wq_head is on the stack, and we
587 leave because we got interrupted, then the
588 wq_head is no longer there when the
589 callback routine tries to wake us up.
590 */
591 ret = mtd->erase(mtd, erase);
592 if (!ret) {
593 set_current_state(TASK_UNINTERRUPTIBLE);
594 add_wait_queue(&waitq, &wait);
595 if (erase->state != MTD_ERASE_DONE &&
596 erase->state != MTD_ERASE_FAILED)
597 schedule();
598 remove_wait_queue(&waitq, &wait);
599 set_current_state(TASK_RUNNING);
600
601 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
602 }
603 kfree(erase);
604 }
605 break;
606 }
607
608 case MEMWRITEOOB:
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->length */
614 if (copy_from_user(&buf, argp, sizeof(buf)))
615 ret = -EFAULT;
616 else
617 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
618 buf.ptr, &buf_user->length);
619 break;
620 }
621
622 case MEMREADOOB:
623 {
624 struct mtd_oob_buf buf;
625 struct mtd_oob_buf __user *buf_user = argp;
626
627 /* NOTE: writes return length to buf_user->start */
628 if (copy_from_user(&buf, argp, sizeof(buf)))
629 ret = -EFAULT;
630 else
631 ret = mtd_do_readoob(mtd, buf.start, buf.length,
632 buf.ptr, &buf_user->start);
633 break;
634 }
635
636 case MEMWRITEOOB64:
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_writeoob(file, mtd, buf.start, buf.length,
645 (void __user *)(uintptr_t)buf.usr_ptr,
646 &buf_user->length);
647 break;
648 }
649
650 case MEMREADOOB64:
651 {
652 struct mtd_oob_buf64 buf;
653 struct mtd_oob_buf64 __user *buf_user = argp;
654
655 if (copy_from_user(&buf, argp, sizeof(buf)))
656 ret = -EFAULT;
657 else
658 ret = mtd_do_readoob(mtd, buf.start, buf.length,
659 (void __user *)(uintptr_t)buf.usr_ptr,
660 &buf_user->length);
661 break;
662 }
663
664 case MEMLOCK:
665 {
666 struct erase_info_user einfo;
667
668 if (copy_from_user(&einfo, argp, sizeof(einfo)))
669 return -EFAULT;
670
671 if (!mtd->lock)
672 ret = -EOPNOTSUPP;
673 else
674 ret = mtd->lock(mtd, einfo.start, einfo.length);
675 break;
676 }
677
678 case MEMUNLOCK:
679 {
680 struct erase_info_user einfo;
681
682 if (copy_from_user(&einfo, argp, sizeof(einfo)))
683 return -EFAULT;
684
685 if (!mtd->unlock)
686 ret = -EOPNOTSUPP;
687 else
688 ret = mtd->unlock(mtd, einfo.start, einfo.length);
689 break;
690 }
691
692 case MEMISLOCKED:
693 {
694 struct erase_info_user einfo;
695
696 if (copy_from_user(&einfo, argp, sizeof(einfo)))
697 return -EFAULT;
698
699 if (!mtd->is_locked)
700 ret = -EOPNOTSUPP;
701 else
702 ret = mtd->is_locked(mtd, einfo.start, einfo.length);
703 break;
704 }
705
706 /* Legacy interface */
707 case MEMGETOOBSEL:
708 {
709 struct nand_oobinfo oi;
710
711 if (!mtd->ecclayout)
712 return -EOPNOTSUPP;
713 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
714 return -EINVAL;
715
716 oi.useecc = MTD_NANDECC_AUTOPLACE;
717 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
718 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
719 sizeof(oi.oobfree));
720 oi.eccbytes = mtd->ecclayout->eccbytes;
721
722 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
723 return -EFAULT;
724 break;
725 }
726
727 case MEMGETBADBLOCK:
728 {
729 loff_t offs;
730
731 if (copy_from_user(&offs, argp, sizeof(loff_t)))
732 return -EFAULT;
733 if (!mtd->block_isbad)
734 ret = -EOPNOTSUPP;
735 else
736 return mtd->block_isbad(mtd, offs);
737 break;
738 }
739
740 case MEMSETBADBLOCK:
741 {
742 loff_t offs;
743
744 if (copy_from_user(&offs, argp, sizeof(loff_t)))
745 return -EFAULT;
746 if (!mtd->block_markbad)
747 ret = -EOPNOTSUPP;
748 else
749 return mtd->block_markbad(mtd, offs);
750 break;
751 }
752
753 #ifdef CONFIG_HAVE_MTD_OTP
754 case OTPSELECT:
755 {
756 int mode;
757 if (copy_from_user(&mode, argp, sizeof(int)))
758 return -EFAULT;
759
760 mfi->mode = MTD_MODE_NORMAL;
761
762 ret = otp_select_filemode(mfi, mode);
763
764 file->f_pos = 0;
765 break;
766 }
767
768 case OTPGETREGIONCOUNT:
769 case OTPGETREGIONINFO:
770 {
771 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
772 if (!buf)
773 return -ENOMEM;
774 ret = -EOPNOTSUPP;
775 switch (mfi->mode) {
776 case MTD_MODE_OTP_FACTORY:
777 if (mtd->get_fact_prot_info)
778 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
779 break;
780 case MTD_MODE_OTP_USER:
781 if (mtd->get_user_prot_info)
782 ret = mtd->get_user_prot_info(mtd, buf, 4096);
783 break;
784 default:
785 break;
786 }
787 if (ret >= 0) {
788 if (cmd == OTPGETREGIONCOUNT) {
789 int nbr = ret / sizeof(struct otp_info);
790 ret = copy_to_user(argp, &nbr, sizeof(int));
791 } else
792 ret = copy_to_user(argp, buf, ret);
793 if (ret)
794 ret = -EFAULT;
795 }
796 kfree(buf);
797 break;
798 }
799
800 case OTPLOCK:
801 {
802 struct otp_info oinfo;
803
804 if (mfi->mode != MTD_MODE_OTP_USER)
805 return -EINVAL;
806 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
807 return -EFAULT;
808 if (!mtd->lock_user_prot_reg)
809 return -EOPNOTSUPP;
810 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
811 break;
812 }
813 #endif
814
815 case ECCGETLAYOUT:
816 {
817 if (!mtd->ecclayout)
818 return -EOPNOTSUPP;
819
820 if (copy_to_user(argp, mtd->ecclayout,
821 sizeof(struct nand_ecclayout)))
822 return -EFAULT;
823 break;
824 }
825
826 case ECCGETSTATS:
827 {
828 if (copy_to_user(argp, &mtd->ecc_stats,
829 sizeof(struct mtd_ecc_stats)))
830 return -EFAULT;
831 break;
832 }
833
834 case MTDFILEMODE:
835 {
836 mfi->mode = 0;
837
838 switch(arg) {
839 case MTD_MODE_OTP_FACTORY:
840 case MTD_MODE_OTP_USER:
841 ret = otp_select_filemode(mfi, arg);
842 break;
843
844 case MTD_MODE_RAW:
845 if (!mtd->read_oob || !mtd->write_oob)
846 return -EOPNOTSUPP;
847 mfi->mode = arg;
848
849 case MTD_MODE_NORMAL:
850 break;
851 default:
852 ret = -EINVAL;
853 }
854 file->f_pos = 0;
855 break;
856 }
857
858 default:
859 ret = -ENOTTY;
860 }
861
862 return ret;
863 } /* memory_ioctl */
864
865 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
866 {
867 int ret;
868
869 lock_kernel();
870 ret = mtd_ioctl(file, cmd, arg);
871 unlock_kernel();
872
873 return ret;
874 }
875
876 #ifdef CONFIG_COMPAT
877
878 struct mtd_oob_buf32 {
879 u_int32_t start;
880 u_int32_t length;
881 compat_caddr_t ptr; /* unsigned char* */
882 };
883
884 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
885 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
886
887 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
888 unsigned long arg)
889 {
890 struct mtd_file_info *mfi = file->private_data;
891 struct mtd_info *mtd = mfi->mtd;
892 void __user *argp = compat_ptr(arg);
893 int ret = 0;
894
895 lock_kernel();
896
897 switch (cmd) {
898 case MEMWRITEOOB32:
899 {
900 struct mtd_oob_buf32 buf;
901 struct mtd_oob_buf32 __user *buf_user = argp;
902
903 if (copy_from_user(&buf, argp, sizeof(buf)))
904 ret = -EFAULT;
905 else
906 ret = mtd_do_writeoob(file, mtd, buf.start,
907 buf.length, compat_ptr(buf.ptr),
908 &buf_user->length);
909 break;
910 }
911
912 case MEMREADOOB32:
913 {
914 struct mtd_oob_buf32 buf;
915 struct mtd_oob_buf32 __user *buf_user = argp;
916
917 /* NOTE: writes return length to buf->start */
918 if (copy_from_user(&buf, argp, sizeof(buf)))
919 ret = -EFAULT;
920 else
921 ret = mtd_do_readoob(mtd, buf.start,
922 buf.length, compat_ptr(buf.ptr),
923 &buf_user->start);
924 break;
925 }
926 default:
927 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
928 }
929
930 unlock_kernel();
931
932 return ret;
933 }
934
935 #endif /* CONFIG_COMPAT */
936
937 /*
938 * try to determine where a shared mapping can be made
939 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
940 * mappings)
941 */
942 #ifndef CONFIG_MMU
943 static unsigned long mtd_get_unmapped_area(struct file *file,
944 unsigned long addr,
945 unsigned long len,
946 unsigned long pgoff,
947 unsigned long flags)
948 {
949 struct mtd_file_info *mfi = file->private_data;
950 struct mtd_info *mtd = mfi->mtd;
951
952 if (mtd->get_unmapped_area) {
953 unsigned long offset;
954
955 if (addr != 0)
956 return (unsigned long) -EINVAL;
957
958 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
959 return (unsigned long) -EINVAL;
960
961 offset = pgoff << PAGE_SHIFT;
962 if (offset > mtd->size - len)
963 return (unsigned long) -EINVAL;
964
965 return mtd->get_unmapped_area(mtd, len, offset, flags);
966 }
967
968 /* can't map directly */
969 return (unsigned long) -ENOSYS;
970 }
971 #endif
972
973 /*
974 * set up a mapping for shared memory segments
975 */
976 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
977 {
978 #ifdef CONFIG_MMU
979 struct mtd_file_info *mfi = file->private_data;
980 struct mtd_info *mtd = mfi->mtd;
981 struct map_info *map = mtd->priv;
982 unsigned long start;
983 unsigned long off;
984 u32 len;
985
986 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
987 off = vma->vm_pgoff << PAGE_SHIFT;
988 start = map->phys;
989 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
990 start &= PAGE_MASK;
991 if ((vma->vm_end - vma->vm_start + off) > len)
992 return -EINVAL;
993
994 off += start;
995 vma->vm_pgoff = off >> PAGE_SHIFT;
996 vma->vm_flags |= VM_IO | VM_RESERVED;
997
998 #ifdef pgprot_noncached
999 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1000 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1001 #endif
1002 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1003 vma->vm_end - vma->vm_start,
1004 vma->vm_page_prot))
1005 return -EAGAIN;
1006
1007 return 0;
1008 }
1009 return -ENOSYS;
1010 #else
1011 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1012 #endif
1013 }
1014
1015 static const struct file_operations mtd_fops = {
1016 .owner = THIS_MODULE,
1017 .llseek = mtd_lseek,
1018 .read = mtd_read,
1019 .write = mtd_write,
1020 .unlocked_ioctl = mtd_unlocked_ioctl,
1021 #ifdef CONFIG_COMPAT
1022 .compat_ioctl = mtd_compat_ioctl,
1023 #endif
1024 .open = mtd_open,
1025 .release = mtd_close,
1026 .mmap = mtd_mmap,
1027 #ifndef CONFIG_MMU
1028 .get_unmapped_area = mtd_get_unmapped_area,
1029 #endif
1030 };
1031
1032 static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags,
1033 const char *dev_name, void *data,
1034 struct vfsmount *mnt)
1035 {
1036 return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
1037 mnt);
1038 }
1039
1040 static struct file_system_type mtd_inodefs_type = {
1041 .name = "mtd_inodefs",
1042 .get_sb = mtd_inodefs_get_sb,
1043 .kill_sb = kill_anon_super,
1044 };
1045
1046 static void mtdchar_notify_add(struct mtd_info *mtd)
1047 {
1048 }
1049
1050 static void mtdchar_notify_remove(struct mtd_info *mtd)
1051 {
1052 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1053
1054 if (mtd_ino) {
1055 /* Destroy the inode if it exists */
1056 mtd_ino->i_nlink = 0;
1057 iput(mtd_ino);
1058 }
1059 }
1060
1061 static struct mtd_notifier mtdchar_notifier = {
1062 .add = mtdchar_notify_add,
1063 .remove = mtdchar_notify_remove,
1064 };
1065
1066 static int __init init_mtdchar(void)
1067 {
1068 int ret;
1069
1070 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1071 "mtd", &mtd_fops);
1072 if (ret < 0) {
1073 pr_notice("Can't allocate major number %d for "
1074 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1075 return ret;
1076 }
1077
1078 ret = register_filesystem(&mtd_inodefs_type);
1079 if (ret) {
1080 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1081 goto err_unregister_chdev;
1082 }
1083
1084 mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1085 if (IS_ERR(mtd_inode_mnt)) {
1086 ret = PTR_ERR(mtd_inode_mnt);
1087 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1088 goto err_unregister_filesystem;
1089 }
1090 register_mtd_user(&mtdchar_notifier);
1091
1092 return ret;
1093
1094 err_unregister_filesystem:
1095 unregister_filesystem(&mtd_inodefs_type);
1096 err_unregister_chdev:
1097 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1098 return ret;
1099 }
1100
1101 static void __exit cleanup_mtdchar(void)
1102 {
1103 unregister_mtd_user(&mtdchar_notifier);
1104 mntput(mtd_inode_mnt);
1105 unregister_filesystem(&mtd_inodefs_type);
1106 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1107 }
1108
1109 module_init(init_mtdchar);
1110 module_exit(cleanup_mtdchar);
1111
1112 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1113
1114 MODULE_LICENSE("GPL");
1115 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1116 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1117 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linux with added FPC-III support