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mtd: autoconvert trivial BKL users to private mutex
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mtd / mtdchar.c
blob5ef45487b65f01c261222b35d5fd6ecc548bea7e
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
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 DEFINE_MUTEX(mtd_mutex);
41 static struct vfsmount *mtd_inode_mnt __read_mostly;
42
43 /*
44 * Data structure to hold the pointer to the mtd device as well
45 * as mode information ofr 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 mtd_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
78
79 static int mtd_open(struct inode *inode, struct file *file)
80 {
81 int minor = iminor(inode);
82 int devnum = minor >> 1;
83 int ret = 0;
84 struct mtd_info *mtd;
85 struct mtd_file_info *mfi;
86 struct inode *mtd_ino;
87
88 DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
89
90 /* You can't open the RO devices RW */
91 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
92 return -EACCES;
93
94 mutex_lock(&mtd_mutex);
95 mtd = get_mtd_device(NULL, devnum);
96
97 if (IS_ERR(mtd)) {
98 ret = PTR_ERR(mtd);
99 goto out;
100 }
101
102 if (mtd->type == MTD_ABSENT) {
103 put_mtd_device(mtd);
104 ret = -ENODEV;
105 goto out;
106 }
107
108 mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
109 if (!mtd_ino) {
110 put_mtd_device(mtd);
111 ret = -ENOMEM;
112 goto out;
113 }
114 if (mtd_ino->i_state & I_NEW) {
115 mtd_ino->i_private = mtd;
116 mtd_ino->i_mode = S_IFCHR;
117 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
118 unlock_new_inode(mtd_ino);
119 }
120 file->f_mapping = mtd_ino->i_mapping;
121
122 /* You can't open it RW if it's not a writeable device */
123 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
124 iput(mtd_ino);
125 put_mtd_device(mtd);
126 ret = -EACCES;
127 goto out;
128 }
129
130 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
131 if (!mfi) {
132 iput(mtd_ino);
133 put_mtd_device(mtd);
134 ret = -ENOMEM;
135 goto out;
136 }
137 mfi->ino = mtd_ino;
138 mfi->mtd = mtd;
139 file->private_data = mfi;
140
141 out:
142 mutex_unlock(&mtd_mutex);
143 return ret;
144 } /* mtd_open */
145
146 /*====================================================================*/
147
148 static int mtd_close(struct inode *inode, struct file *file)
149 {
150 struct mtd_file_info *mfi = file->private_data;
151 struct mtd_info *mtd = mfi->mtd;
152
153 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
154
155 /* Only sync if opened RW */
156 if ((file->f_mode & FMODE_WRITE) && mtd->sync)
157 mtd->sync(mtd);
158
159 iput(mfi->ino);
160
161 put_mtd_device(mtd);
162 file->private_data = NULL;
163 kfree(mfi);
164
165 return 0;
166 } /* mtd_close */
167
168 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
169 userspace buffer down and use it directly with readv/writev.
170 */
171 #define MAX_KMALLOC_SIZE 0x20000
172
173 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
174 {
175 struct mtd_file_info *mfi = file->private_data;
176 struct mtd_info *mtd = mfi->mtd;
177 size_t retlen=0;
178 size_t total_retlen=0;
179 int ret=0;
180 int len;
181 char *kbuf;
182
183 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
184
185 if (*ppos + count > mtd->size)
186 count = mtd->size - *ppos;
187
188 if (!count)
189 return 0;
190
191 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
192 and pass them directly to the MTD functions */
193
194 if (count > MAX_KMALLOC_SIZE)
195 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
196 else
197 kbuf=kmalloc(count, GFP_KERNEL);
198
199 if (!kbuf)
200 return -ENOMEM;
201
202 while (count) {
203
204 if (count > MAX_KMALLOC_SIZE)
205 len = MAX_KMALLOC_SIZE;
206 else
207 len = count;
208
209 switch (mfi->mode) {
210 case MTD_MODE_OTP_FACTORY:
211 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
212 break;
213 case MTD_MODE_OTP_USER:
214 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
215 break;
216 case MTD_MODE_RAW:
217 {
218 struct mtd_oob_ops ops;
219
220 ops.mode = MTD_OOB_RAW;
221 ops.datbuf = kbuf;
222 ops.oobbuf = NULL;
223 ops.len = len;
224
225 ret = mtd->read_oob(mtd, *ppos, &ops);
226 retlen = ops.retlen;
227 break;
228 }
229 default:
230 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
231 }
232 /* Nand returns -EBADMSG on ecc errors, but it returns
233 * the data. For our userspace tools it is important
234 * to dump areas with ecc errors !
235 * For kernel internal usage it also might return -EUCLEAN
236 * to signal the caller that a bitflip has occured and has
237 * been corrected by the ECC algorithm.
238 * Userspace software which accesses NAND this way
239 * must be aware of the fact that it deals with NAND
240 */
241 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
242 *ppos += retlen;
243 if (copy_to_user(buf, kbuf, retlen)) {
244 kfree(kbuf);
245 return -EFAULT;
246 }
247 else
248 total_retlen += retlen;
249
250 count -= retlen;
251 buf += retlen;
252 if (retlen == 0)
253 count = 0;
254 }
255 else {
256 kfree(kbuf);
257 return ret;
258 }
259
260 }
261
262 kfree(kbuf);
263 return total_retlen;
264 } /* mtd_read */
265
266 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
267 {
268 struct mtd_file_info *mfi = file->private_data;
269 struct mtd_info *mtd = mfi->mtd;
270 char *kbuf;
271 size_t retlen;
272 size_t total_retlen=0;
273 int ret=0;
274 int len;
275
276 DEBUG(MTD_DEBUG_LEVEL0,"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 if (count > MAX_KMALLOC_SIZE)
288 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
289 else
290 kbuf=kmalloc(count, GFP_KERNEL);
291
292 if (!kbuf)
293 return -ENOMEM;
294
295 while (count) {
296
297 if (count > MAX_KMALLOC_SIZE)
298 len = MAX_KMALLOC_SIZE;
299 else
300 len = count;
301
302 if (copy_from_user(kbuf, buf, len)) {
303 kfree(kbuf);
304 return -EFAULT;
305 }
306
307 switch (mfi->mode) {
308 case MTD_MODE_OTP_FACTORY:
309 ret = -EROFS;
310 break;
311 case MTD_MODE_OTP_USER:
312 if (!mtd->write_user_prot_reg) {
313 ret = -EOPNOTSUPP;
314 break;
315 }
316 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
317 break;
318
319 case MTD_MODE_RAW:
320 {
321 struct mtd_oob_ops ops;
322
323 ops.mode = MTD_OOB_RAW;
324 ops.datbuf = kbuf;
325 ops.oobbuf = NULL;
326 ops.len = len;
327
328 ret = mtd->write_oob(mtd, *ppos, &ops);
329 retlen = ops.retlen;
330 break;
331 }
332
333 default:
334 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
335 }
336 if (!ret) {
337 *ppos += retlen;
338 total_retlen += retlen;
339 count -= retlen;
340 buf += retlen;
341 }
342 else {
343 kfree(kbuf);
344 return ret;
345 }
346 }
347
348 kfree(kbuf);
349 return total_retlen;
350 } /* mtd_write */
351
352 /*======================================================================
353
354 IOCTL calls for getting device parameters.
355
356 ======================================================================*/
357 static void mtdchar_erase_callback (struct erase_info *instr)
358 {
359 wake_up((wait_queue_head_t *)instr->priv);
360 }
361
362 #ifdef CONFIG_HAVE_MTD_OTP
363 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
364 {
365 struct mtd_info *mtd = mfi->mtd;
366 int ret = 0;
367
368 switch (mode) {
369 case MTD_OTP_FACTORY:
370 if (!mtd->read_fact_prot_reg)
371 ret = -EOPNOTSUPP;
372 else
373 mfi->mode = MTD_MODE_OTP_FACTORY;
374 break;
375 case MTD_OTP_USER:
376 if (!mtd->read_fact_prot_reg)
377 ret = -EOPNOTSUPP;
378 else
379 mfi->mode = MTD_MODE_OTP_USER;
380 break;
381 default:
382 ret = -EINVAL;
383 case MTD_OTP_OFF:
384 break;
385 }
386 return ret;
387 }
388 #else
389 # define otp_select_filemode(f,m) -EOPNOTSUPP
390 #endif
391
392 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
393 uint64_t start, uint32_t length, void __user *ptr,
394 uint32_t __user *retp)
395 {
396 struct mtd_oob_ops ops;
397 uint32_t retlen;
398 int ret = 0;
399
400 if (!(file->f_mode & FMODE_WRITE))
401 return -EPERM;
402
403 if (length > 4096)
404 return -EINVAL;
405
406 if (!mtd->write_oob)
407 ret = -EOPNOTSUPP;
408 else
409 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
410
411 if (ret)
412 return ret;
413
414 ops.ooblen = length;
415 ops.ooboffs = start & (mtd->oobsize - 1);
416 ops.datbuf = NULL;
417 ops.mode = MTD_OOB_PLACE;
418
419 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
420 return -EINVAL;
421
422 ops.oobbuf = memdup_user(ptr, length);
423 if (IS_ERR(ops.oobbuf))
424 return PTR_ERR(ops.oobbuf);
425
426 start &= ~((uint64_t)mtd->oobsize - 1);
427 ret = mtd->write_oob(mtd, start, &ops);
428
429 if (ops.oobretlen > 0xFFFFFFFFU)
430 ret = -EOVERFLOW;
431 retlen = ops.oobretlen;
432 if (copy_to_user(retp, &retlen, sizeof(length)))
433 ret = -EFAULT;
434
435 kfree(ops.oobbuf);
436 return ret;
437 }
438
439 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
440 uint32_t length, void __user *ptr, uint32_t __user *retp)
441 {
442 struct mtd_oob_ops ops;
443 int ret = 0;
444
445 if (length > 4096)
446 return -EINVAL;
447
448 if (!mtd->read_oob)
449 ret = -EOPNOTSUPP;
450 else
451 ret = access_ok(VERIFY_WRITE, ptr,
452 length) ? 0 : -EFAULT;
453 if (ret)
454 return ret;
455
456 ops.ooblen = length;
457 ops.ooboffs = start & (mtd->oobsize - 1);
458 ops.datbuf = NULL;
459 ops.mode = MTD_OOB_PLACE;
460
461 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
462 return -EINVAL;
463
464 ops.oobbuf = kmalloc(length, GFP_KERNEL);
465 if (!ops.oobbuf)
466 return -ENOMEM;
467
468 start &= ~((uint64_t)mtd->oobsize - 1);
469 ret = mtd->read_oob(mtd, start, &ops);
470
471 if (put_user(ops.oobretlen, retp))
472 ret = -EFAULT;
473 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
474 ops.oobretlen))
475 ret = -EFAULT;
476
477 kfree(ops.oobbuf);
478 return ret;
479 }
480
481 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
482 {
483 struct mtd_file_info *mfi = file->private_data;
484 struct mtd_info *mtd = mfi->mtd;
485 void __user *argp = (void __user *)arg;
486 int ret = 0;
487 u_long size;
488 struct mtd_info_user info;
489
490 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
491
492 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
493 if (cmd & IOC_IN) {
494 if (!access_ok(VERIFY_READ, argp, size))
495 return -EFAULT;
496 }
497 if (cmd & IOC_OUT) {
498 if (!access_ok(VERIFY_WRITE, argp, size))
499 return -EFAULT;
500 }
501
502 switch (cmd) {
503 case MEMGETREGIONCOUNT:
504 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
505 return -EFAULT;
506 break;
507
508 case MEMGETREGIONINFO:
509 {
510 uint32_t ur_idx;
511 struct mtd_erase_region_info *kr;
512 struct region_info_user __user *ur = argp;
513
514 if (get_user(ur_idx, &(ur->regionindex)))
515 return -EFAULT;
516
517 kr = &(mtd->eraseregions[ur_idx]);
518
519 if (put_user(kr->offset, &(ur->offset))
520 || put_user(kr->erasesize, &(ur->erasesize))
521 || put_user(kr->numblocks, &(ur->numblocks)))
522 return -EFAULT;
523
524 break;
525 }
526
527 case MEMGETINFO:
528 info.type = mtd->type;
529 info.flags = mtd->flags;
530 info.size = mtd->size;
531 info.erasesize = mtd->erasesize;
532 info.writesize = mtd->writesize;
533 info.oobsize = mtd->oobsize;
534 /* The below fields are obsolete */
535 info.ecctype = -1;
536 info.eccsize = 0;
537 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
538 return -EFAULT;
539 break;
540
541 case MEMERASE:
542 case MEMERASE64:
543 {
544 struct erase_info *erase;
545
546 if(!(file->f_mode & FMODE_WRITE))
547 return -EPERM;
548
549 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
550 if (!erase)
551 ret = -ENOMEM;
552 else {
553 wait_queue_head_t waitq;
554 DECLARE_WAITQUEUE(wait, current);
555
556 init_waitqueue_head(&waitq);
557
558 if (cmd == MEMERASE64) {
559 struct erase_info_user64 einfo64;
560
561 if (copy_from_user(&einfo64, argp,
562 sizeof(struct erase_info_user64))) {
563 kfree(erase);
564 return -EFAULT;
565 }
566 erase->addr = einfo64.start;
567 erase->len = einfo64.length;
568 } else {
569 struct erase_info_user einfo32;
570
571 if (copy_from_user(&einfo32, argp,
572 sizeof(struct erase_info_user))) {
573 kfree(erase);
574 return -EFAULT;
575 }
576 erase->addr = einfo32.start;
577 erase->len = einfo32.length;
578 }
579 erase->mtd = mtd;
580 erase->callback = mtdchar_erase_callback;
581 erase->priv = (unsigned long)&waitq;
582
583 /*
584 FIXME: Allow INTERRUPTIBLE. Which means
585 not having the wait_queue head on the stack.
586
587 If the wq_head is on the stack, and we
588 leave because we got interrupted, then the
589 wq_head is no longer there when the
590 callback routine tries to wake us up.
591 */
592 ret = mtd->erase(mtd, erase);
593 if (!ret) {
594 set_current_state(TASK_UNINTERRUPTIBLE);
595 add_wait_queue(&waitq, &wait);
596 if (erase->state != MTD_ERASE_DONE &&
597 erase->state != MTD_ERASE_FAILED)
598 schedule();
599 remove_wait_queue(&waitq, &wait);
600 set_current_state(TASK_RUNNING);
601
602 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
603 }
604 kfree(erase);
605 }
606 break;
607 }
608
609 case MEMWRITEOOB:
610 {
611 struct mtd_oob_buf buf;
612 struct mtd_oob_buf __user *buf_user = argp;
613
614 /* NOTE: writes return length to buf_user->length */
615 if (copy_from_user(&buf, argp, sizeof(buf)))
616 ret = -EFAULT;
617 else
618 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
619 buf.ptr, &buf_user->length);
620 break;
621 }
622
623 case MEMREADOOB:
624 {
625 struct mtd_oob_buf buf;
626 struct mtd_oob_buf __user *buf_user = argp;
627
628 /* NOTE: writes return length to buf_user->start */
629 if (copy_from_user(&buf, argp, sizeof(buf)))
630 ret = -EFAULT;
631 else
632 ret = mtd_do_readoob(mtd, buf.start, buf.length,
633 buf.ptr, &buf_user->start);
634 break;
635 }
636
637 case MEMWRITEOOB64:
638 {
639 struct mtd_oob_buf64 buf;
640 struct mtd_oob_buf64 __user *buf_user = argp;
641
642 if (copy_from_user(&buf, argp, sizeof(buf)))
643 ret = -EFAULT;
644 else
645 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
646 (void __user *)(uintptr_t)buf.usr_ptr,
647 &buf_user->length);
648 break;
649 }
650
651 case MEMREADOOB64:
652 {
653 struct mtd_oob_buf64 buf;
654 struct mtd_oob_buf64 __user *buf_user = argp;
655
656 if (copy_from_user(&buf, argp, sizeof(buf)))
657 ret = -EFAULT;
658 else
659 ret = mtd_do_readoob(mtd, buf.start, buf.length,
660 (void __user *)(uintptr_t)buf.usr_ptr,
661 &buf_user->length);
662 break;
663 }
664
665 case MEMLOCK:
666 {
667 struct erase_info_user einfo;
668
669 if (copy_from_user(&einfo, argp, sizeof(einfo)))
670 return -EFAULT;
671
672 if (!mtd->lock)
673 ret = -EOPNOTSUPP;
674 else
675 ret = mtd->lock(mtd, einfo.start, einfo.length);
676 break;
677 }
678
679 case MEMUNLOCK:
680 {
681 struct erase_info_user einfo;
682
683 if (copy_from_user(&einfo, argp, sizeof(einfo)))
684 return -EFAULT;
685
686 if (!mtd->unlock)
687 ret = -EOPNOTSUPP;
688 else
689 ret = mtd->unlock(mtd, einfo.start, einfo.length);
690 break;
691 }
692
693 case MEMISLOCKED:
694 {
695 struct erase_info_user einfo;
696
697 if (copy_from_user(&einfo, argp, sizeof(einfo)))
698 return -EFAULT;
699
700 if (!mtd->is_locked)
701 ret = -EOPNOTSUPP;
702 else
703 ret = mtd->is_locked(mtd, einfo.start, einfo.length);
704 break;
705 }
706
707 /* Legacy interface */
708 case MEMGETOOBSEL:
709 {
710 struct nand_oobinfo oi;
711
712 if (!mtd->ecclayout)
713 return -EOPNOTSUPP;
714 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
715 return -EINVAL;
716
717 oi.useecc = MTD_NANDECC_AUTOPLACE;
718 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
719 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
720 sizeof(oi.oobfree));
721 oi.eccbytes = mtd->ecclayout->eccbytes;
722
723 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
724 return -EFAULT;
725 break;
726 }
727
728 case MEMGETBADBLOCK:
729 {
730 loff_t offs;
731
732 if (copy_from_user(&offs, argp, sizeof(loff_t)))
733 return -EFAULT;
734 if (!mtd->block_isbad)
735 ret = -EOPNOTSUPP;
736 else
737 return mtd->block_isbad(mtd, offs);
738 break;
739 }
740
741 case MEMSETBADBLOCK:
742 {
743 loff_t offs;
744
745 if (copy_from_user(&offs, argp, sizeof(loff_t)))
746 return -EFAULT;
747 if (!mtd->block_markbad)
748 ret = -EOPNOTSUPP;
749 else
750 return mtd->block_markbad(mtd, offs);
751 break;
752 }
753
754 #ifdef CONFIG_HAVE_MTD_OTP
755 case OTPSELECT:
756 {
757 int mode;
758 if (copy_from_user(&mode, argp, sizeof(int)))
759 return -EFAULT;
760
761 mfi->mode = MTD_MODE_NORMAL;
762
763 ret = otp_select_filemode(mfi, mode);
764
765 file->f_pos = 0;
766 break;
767 }
768
769 case OTPGETREGIONCOUNT:
770 case OTPGETREGIONINFO:
771 {
772 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
773 if (!buf)
774 return -ENOMEM;
775 ret = -EOPNOTSUPP;
776 switch (mfi->mode) {
777 case MTD_MODE_OTP_FACTORY:
778 if (mtd->get_fact_prot_info)
779 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
780 break;
781 case MTD_MODE_OTP_USER:
782 if (mtd->get_user_prot_info)
783 ret = mtd->get_user_prot_info(mtd, buf, 4096);
784 break;
785 default:
786 break;
787 }
788 if (ret >= 0) {
789 if (cmd == OTPGETREGIONCOUNT) {
790 int nbr = ret / sizeof(struct otp_info);
791 ret = copy_to_user(argp, &nbr, sizeof(int));
792 } else
793 ret = copy_to_user(argp, buf, ret);
794 if (ret)
795 ret = -EFAULT;
796 }
797 kfree(buf);
798 break;
799 }
800
801 case OTPLOCK:
802 {
803 struct otp_info oinfo;
804
805 if (mfi->mode != MTD_MODE_OTP_USER)
806 return -EINVAL;
807 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
808 return -EFAULT;
809 if (!mtd->lock_user_prot_reg)
810 return -EOPNOTSUPP;
811 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
812 break;
813 }
814 #endif
815
816 case ECCGETLAYOUT:
817 {
818 if (!mtd->ecclayout)
819 return -EOPNOTSUPP;
820
821 if (copy_to_user(argp, mtd->ecclayout,
822 sizeof(struct nand_ecclayout)))
823 return -EFAULT;
824 break;
825 }
826
827 case ECCGETSTATS:
828 {
829 if (copy_to_user(argp, &mtd->ecc_stats,
830 sizeof(struct mtd_ecc_stats)))
831 return -EFAULT;
832 break;
833 }
834
835 case MTDFILEMODE:
836 {
837 mfi->mode = 0;
838
839 switch(arg) {
840 case MTD_MODE_OTP_FACTORY:
841 case MTD_MODE_OTP_USER:
842 ret = otp_select_filemode(mfi, arg);
843 break;
844
845 case MTD_MODE_RAW:
846 if (!mtd->read_oob || !mtd->write_oob)
847 return -EOPNOTSUPP;
848 mfi->mode = arg;
849
850 case MTD_MODE_NORMAL:
851 break;
852 default:
853 ret = -EINVAL;
854 }
855 file->f_pos = 0;
856 break;
857 }
858
859 default:
860 ret = -ENOTTY;
861 }
862
863 return ret;
864 } /* memory_ioctl */
865
866 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
867 {
868 int ret;
869
870 mutex_lock(&mtd_mutex);
871 ret = mtd_ioctl(file, cmd, arg);
872 mutex_unlock(&mtd_mutex);
873
874 return ret;
875 }
876
877 #ifdef CONFIG_COMPAT
878
879 struct mtd_oob_buf32 {
880 u_int32_t start;
881 u_int32_t length;
882 compat_caddr_t ptr; /* unsigned char* */
883 };
884
885 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
886 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
887
888 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
889 unsigned long arg)
890 {
891 struct mtd_file_info *mfi = file->private_data;
892 struct mtd_info *mtd = mfi->mtd;
893 void __user *argp = compat_ptr(arg);
894 int ret = 0;
895
896 mutex_lock(&mtd_mutex);
897
898 switch (cmd) {
899 case MEMWRITEOOB32:
900 {
901 struct mtd_oob_buf32 buf;
902 struct mtd_oob_buf32 __user *buf_user = argp;
903
904 if (copy_from_user(&buf, argp, sizeof(buf)))
905 ret = -EFAULT;
906 else
907 ret = mtd_do_writeoob(file, mtd, buf.start,
908 buf.length, compat_ptr(buf.ptr),
909 &buf_user->length);
910 break;
911 }
912
913 case MEMREADOOB32:
914 {
915 struct mtd_oob_buf32 buf;
916 struct mtd_oob_buf32 __user *buf_user = argp;
917
918 /* NOTE: writes return length to buf->start */
919 if (copy_from_user(&buf, argp, sizeof(buf)))
920 ret = -EFAULT;
921 else
922 ret = mtd_do_readoob(mtd, buf.start,
923 buf.length, compat_ptr(buf.ptr),
924 &buf_user->start);
925 break;
926 }
927 default:
928 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
929 }
930
931 mutex_unlock(&mtd_mutex);
932
933 return ret;
934 }
935
936 #endif /* CONFIG_COMPAT */
937
938 /*
939 * try to determine where a shared mapping can be made
940 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
941 * mappings)
942 */
943 #ifndef CONFIG_MMU
944 static unsigned long mtd_get_unmapped_area(struct file *file,
945 unsigned long addr,
946 unsigned long len,
947 unsigned long pgoff,
948 unsigned long flags)
949 {
950 struct mtd_file_info *mfi = file->private_data;
951 struct mtd_info *mtd = mfi->mtd;
952
953 if (mtd->get_unmapped_area) {
954 unsigned long offset;
955
956 if (addr != 0)
957 return (unsigned long) -EINVAL;
958
959 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
960 return (unsigned long) -EINVAL;
961
962 offset = pgoff << PAGE_SHIFT;
963 if (offset > mtd->size - len)
964 return (unsigned long) -EINVAL;
965
966 return mtd->get_unmapped_area(mtd, len, offset, flags);
967 }
968
969 /* can't map directly */
970 return (unsigned long) -ENOSYS;
971 }
972 #endif
973
974 /*
975 * set up a mapping for shared memory segments
976 */
977 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
978 {
979 #ifdef CONFIG_MMU
980 struct mtd_file_info *mfi = file->private_data;
981 struct mtd_info *mtd = mfi->mtd;
982 struct map_info *map = mtd->priv;
983 unsigned long start;
984 unsigned long off;
985 u32 len;
986
987 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
988 off = vma->vm_pgoff << PAGE_SHIFT;
989 start = map->phys;
990 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
991 start &= PAGE_MASK;
992 if ((vma->vm_end - vma->vm_start + off) > len)
993 return -EINVAL;
994
995 off += start;
996 vma->vm_pgoff = off >> PAGE_SHIFT;
997 vma->vm_flags |= VM_IO | VM_RESERVED;
998
999 #ifdef pgprot_noncached
1000 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1001 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1002 #endif
1003 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1004 vma->vm_end - vma->vm_start,
1005 vma->vm_page_prot))
1006 return -EAGAIN;
1007
1008 return 0;
1009 }
1010 return -ENOSYS;
1011 #else
1012 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1013 #endif
1014 }
1015
1016 static const struct file_operations mtd_fops = {
1017 .owner = THIS_MODULE,
1018 .llseek = mtd_lseek,
1019 .read = mtd_read,
1020 .write = mtd_write,
1021 .unlocked_ioctl = mtd_unlocked_ioctl,
1022 #ifdef CONFIG_COMPAT
1023 .compat_ioctl = mtd_compat_ioctl,
1024 #endif
1025 .open = mtd_open,
1026 .release = mtd_close,
1027 .mmap = mtd_mmap,
1028 #ifndef CONFIG_MMU
1029 .get_unmapped_area = mtd_get_unmapped_area,
1030 #endif
1031 };
1032
1033 static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags,
1034 const char *dev_name, void *data,
1035 struct vfsmount *mnt)
1036 {
1037 return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
1038 mnt);
1039 }
1040
1041 static struct file_system_type mtd_inodefs_type = {
1042 .name = "mtd_inodefs",
1043 .get_sb = mtd_inodefs_get_sb,
1044 .kill_sb = kill_anon_super,
1045 };
1046
1047 static void mtdchar_notify_add(struct mtd_info *mtd)
1048 {
1049 }
1050
1051 static void mtdchar_notify_remove(struct mtd_info *mtd)
1052 {
1053 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1054
1055 if (mtd_ino) {
1056 /* Destroy the inode if it exists */
1057 mtd_ino->i_nlink = 0;
1058 iput(mtd_ino);
1059 }
1060 }
1061
1062 static struct mtd_notifier mtdchar_notifier = {
1063 .add = mtdchar_notify_add,
1064 .remove = mtdchar_notify_remove,
1065 };
1066
1067 static int __init init_mtdchar(void)
1068 {
1069 int ret;
1070
1071 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1072 "mtd", &mtd_fops);
1073 if (ret < 0) {
1074 pr_notice("Can't allocate major number %d for "
1075 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1076 return ret;
1077 }
1078
1079 ret = register_filesystem(&mtd_inodefs_type);
1080 if (ret) {
1081 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1082 goto err_unregister_chdev;
1083 }
1084
1085 mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1086 if (IS_ERR(mtd_inode_mnt)) {
1087 ret = PTR_ERR(mtd_inode_mnt);
1088 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1089 goto err_unregister_filesystem;
1090 }
1091 register_mtd_user(&mtdchar_notifier);
1092
1093 return ret;
1094
1095 err_unregister_filesystem:
1096 unregister_filesystem(&mtd_inodefs_type);
1097 err_unregister_chdev:
1098 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1099 return ret;
1100 }
1101
1102 static void __exit cleanup_mtdchar(void)
1103 {
1104 unregister_mtd_user(&mtdchar_notifier);
1105 mntput(mtd_inode_mnt);
1106 unregister_filesystem(&mtd_inodefs_type);
1107 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1108 }
1109
1110 module_init(init_mtdchar);
1111 module_exit(cleanup_mtdchar);
1112
1113 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1114
1115 MODULE_LICENSE("GPL");
1116 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1117 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1118 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree