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Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs
[linux/fpc-iii.git] / drivers / mtd / mtdchar.c
blob000d65ea55a42bf495ba773dca6c66f99f0d3136
1 /*
2 * Character-device access to raw MTD devices.
3 *
4 */
5
6 #include <linux/device.h>
7 #include <linux/fs.h>
8 #include <linux/mm.h>
9 #include <linux/err.h>
10 #include <linux/init.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/sched.h>
15 #include <linux/smp_lock.h>
16 #include <linux/backing-dev.h>
17 #include <linux/compat.h>
18 #include <linux/mount.h>
19
20 #include <linux/mtd/mtd.h>
21 #include <linux/mtd/compatmac.h>
22
23 #include <asm/uaccess.h>
24
25 #define MTD_INODE_FS_MAGIC 0x11307854
26 static struct vfsmount *mtd_inode_mnt __read_mostly;
27
28 /*
29 * Data structure to hold the pointer to the mtd device as well
30 * as mode information ofr various use cases.
31 */
32 struct mtd_file_info {
33 struct mtd_info *mtd;
34 struct inode *ino;
35 enum mtd_file_modes mode;
36 };
37
38 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
39 {
40 struct mtd_file_info *mfi = file->private_data;
41 struct mtd_info *mtd = mfi->mtd;
42
43 switch (orig) {
44 case SEEK_SET:
45 break;
46 case SEEK_CUR:
47 offset += file->f_pos;
48 break;
49 case SEEK_END:
50 offset += mtd->size;
51 break;
52 default:
53 return -EINVAL;
54 }
55
56 if (offset >= 0 && offset <= mtd->size)
57 return file->f_pos = offset;
58
59 return -EINVAL;
60 }
61
62
63
64 static int mtd_open(struct inode *inode, struct file *file)
65 {
66 int minor = iminor(inode);
67 int devnum = minor >> 1;
68 int ret = 0;
69 struct mtd_info *mtd;
70 struct mtd_file_info *mfi;
71 struct inode *mtd_ino;
72
73 DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
74
75 /* You can't open the RO devices RW */
76 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
77 return -EACCES;
78
79 lock_kernel();
80 mtd = get_mtd_device(NULL, devnum);
81
82 if (IS_ERR(mtd)) {
83 ret = PTR_ERR(mtd);
84 goto out;
85 }
86
87 if (mtd->type == MTD_ABSENT) {
88 put_mtd_device(mtd);
89 ret = -ENODEV;
90 goto out;
91 }
92
93 mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
94 if (!mtd_ino) {
95 put_mtd_device(mtd);
96 ret = -ENOMEM;
97 goto out;
98 }
99 if (mtd_ino->i_state & I_NEW) {
100 mtd_ino->i_private = mtd;
101 mtd_ino->i_mode = S_IFCHR;
102 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
103 unlock_new_inode(mtd_ino);
104 }
105 file->f_mapping = mtd_ino->i_mapping;
106
107 /* You can't open it RW if it's not a writeable device */
108 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
109 iput(mtd_ino);
110 put_mtd_device(mtd);
111 ret = -EACCES;
112 goto out;
113 }
114
115 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
116 if (!mfi) {
117 iput(mtd_ino);
118 put_mtd_device(mtd);
119 ret = -ENOMEM;
120 goto out;
121 }
122 mfi->ino = mtd_ino;
123 mfi->mtd = mtd;
124 file->private_data = mfi;
125
126 out:
127 unlock_kernel();
128 return ret;
129 } /* mtd_open */
130
131 /*====================================================================*/
132
133 static int mtd_close(struct inode *inode, struct file *file)
134 {
135 struct mtd_file_info *mfi = file->private_data;
136 struct mtd_info *mtd = mfi->mtd;
137
138 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
139
140 /* Only sync if opened RW */
141 if ((file->f_mode & FMODE_WRITE) && mtd->sync)
142 mtd->sync(mtd);
143
144 iput(mfi->ino);
145
146 put_mtd_device(mtd);
147 file->private_data = NULL;
148 kfree(mfi);
149
150 return 0;
151 } /* mtd_close */
152
153 /* FIXME: This _really_ needs to die. In 2.5, we should lock the
154 userspace buffer down and use it directly with readv/writev.
155 */
156 #define MAX_KMALLOC_SIZE 0x20000
157
158 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
159 {
160 struct mtd_file_info *mfi = file->private_data;
161 struct mtd_info *mtd = mfi->mtd;
162 size_t retlen=0;
163 size_t total_retlen=0;
164 int ret=0;
165 int len;
166 char *kbuf;
167
168 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
169
170 if (*ppos + count > mtd->size)
171 count = mtd->size - *ppos;
172
173 if (!count)
174 return 0;
175
176 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers
177 and pass them directly to the MTD functions */
178
179 if (count > MAX_KMALLOC_SIZE)
180 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
181 else
182 kbuf=kmalloc(count, GFP_KERNEL);
183
184 if (!kbuf)
185 return -ENOMEM;
186
187 while (count) {
188
189 if (count > MAX_KMALLOC_SIZE)
190 len = MAX_KMALLOC_SIZE;
191 else
192 len = count;
193
194 switch (mfi->mode) {
195 case MTD_MODE_OTP_FACTORY:
196 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
197 break;
198 case MTD_MODE_OTP_USER:
199 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
200 break;
201 case MTD_MODE_RAW:
202 {
203 struct mtd_oob_ops ops;
204
205 ops.mode = MTD_OOB_RAW;
206 ops.datbuf = kbuf;
207 ops.oobbuf = NULL;
208 ops.len = len;
209
210 ret = mtd->read_oob(mtd, *ppos, &ops);
211 retlen = ops.retlen;
212 break;
213 }
214 default:
215 ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
216 }
217 /* Nand returns -EBADMSG on ecc errors, but it returns
218 * the data. For our userspace tools it is important
219 * to dump areas with ecc errors !
220 * For kernel internal usage it also might return -EUCLEAN
221 * to signal the caller that a bitflip has occured and has
222 * been corrected by the ECC algorithm.
223 * Userspace software which accesses NAND this way
224 * must be aware of the fact that it deals with NAND
225 */
226 if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
227 *ppos += retlen;
228 if (copy_to_user(buf, kbuf, retlen)) {
229 kfree(kbuf);
230 return -EFAULT;
231 }
232 else
233 total_retlen += retlen;
234
235 count -= retlen;
236 buf += retlen;
237 if (retlen == 0)
238 count = 0;
239 }
240 else {
241 kfree(kbuf);
242 return ret;
243 }
244
245 }
246
247 kfree(kbuf);
248 return total_retlen;
249 } /* mtd_read */
250
251 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
252 {
253 struct mtd_file_info *mfi = file->private_data;
254 struct mtd_info *mtd = mfi->mtd;
255 char *kbuf;
256 size_t retlen;
257 size_t total_retlen=0;
258 int ret=0;
259 int len;
260
261 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
262
263 if (*ppos == mtd->size)
264 return -ENOSPC;
265
266 if (*ppos + count > mtd->size)
267 count = mtd->size - *ppos;
268
269 if (!count)
270 return 0;
271
272 if (count > MAX_KMALLOC_SIZE)
273 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
274 else
275 kbuf=kmalloc(count, GFP_KERNEL);
276
277 if (!kbuf)
278 return -ENOMEM;
279
280 while (count) {
281
282 if (count > MAX_KMALLOC_SIZE)
283 len = MAX_KMALLOC_SIZE;
284 else
285 len = count;
286
287 if (copy_from_user(kbuf, buf, len)) {
288 kfree(kbuf);
289 return -EFAULT;
290 }
291
292 switch (mfi->mode) {
293 case MTD_MODE_OTP_FACTORY:
294 ret = -EROFS;
295 break;
296 case MTD_MODE_OTP_USER:
297 if (!mtd->write_user_prot_reg) {
298 ret = -EOPNOTSUPP;
299 break;
300 }
301 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
302 break;
303
304 case MTD_MODE_RAW:
305 {
306 struct mtd_oob_ops ops;
307
308 ops.mode = MTD_OOB_RAW;
309 ops.datbuf = kbuf;
310 ops.oobbuf = NULL;
311 ops.len = len;
312
313 ret = mtd->write_oob(mtd, *ppos, &ops);
314 retlen = ops.retlen;
315 break;
316 }
317
318 default:
319 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
320 }
321 if (!ret) {
322 *ppos += retlen;
323 total_retlen += retlen;
324 count -= retlen;
325 buf += retlen;
326 }
327 else {
328 kfree(kbuf);
329 return ret;
330 }
331 }
332
333 kfree(kbuf);
334 return total_retlen;
335 } /* mtd_write */
336
337 /*======================================================================
338
339 IOCTL calls for getting device parameters.
340
341 ======================================================================*/
342 static void mtdchar_erase_callback (struct erase_info *instr)
343 {
344 wake_up((wait_queue_head_t *)instr->priv);
345 }
346
347 #ifdef CONFIG_HAVE_MTD_OTP
348 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
349 {
350 struct mtd_info *mtd = mfi->mtd;
351 int ret = 0;
352
353 switch (mode) {
354 case MTD_OTP_FACTORY:
355 if (!mtd->read_fact_prot_reg)
356 ret = -EOPNOTSUPP;
357 else
358 mfi->mode = MTD_MODE_OTP_FACTORY;
359 break;
360 case MTD_OTP_USER:
361 if (!mtd->read_fact_prot_reg)
362 ret = -EOPNOTSUPP;
363 else
364 mfi->mode = MTD_MODE_OTP_USER;
365 break;
366 default:
367 ret = -EINVAL;
368 case MTD_OTP_OFF:
369 break;
370 }
371 return ret;
372 }
373 #else
374 # define otp_select_filemode(f,m) -EOPNOTSUPP
375 #endif
376
377 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
378 uint64_t start, uint32_t length, void __user *ptr,
379 uint32_t __user *retp)
380 {
381 struct mtd_oob_ops ops;
382 uint32_t retlen;
383 int ret = 0;
384
385 if (!(file->f_mode & FMODE_WRITE))
386 return -EPERM;
387
388 if (length > 4096)
389 return -EINVAL;
390
391 if (!mtd->write_oob)
392 ret = -EOPNOTSUPP;
393 else
394 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
395
396 if (ret)
397 return ret;
398
399 ops.ooblen = length;
400 ops.ooboffs = start & (mtd->oobsize - 1);
401 ops.datbuf = NULL;
402 ops.mode = MTD_OOB_PLACE;
403
404 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
405 return -EINVAL;
406
407 ops.oobbuf = kmalloc(length, GFP_KERNEL);
408 if (!ops.oobbuf)
409 return -ENOMEM;
410
411 if (copy_from_user(ops.oobbuf, ptr, length)) {
412 kfree(ops.oobbuf);
413 return -EFAULT;
414 }
415
416 start &= ~((uint64_t)mtd->oobsize - 1);
417 ret = mtd->write_oob(mtd, start, &ops);
418
419 if (ops.oobretlen > 0xFFFFFFFFU)
420 ret = -EOVERFLOW;
421 retlen = ops.oobretlen;
422 if (copy_to_user(retp, &retlen, sizeof(length)))
423 ret = -EFAULT;
424
425 kfree(ops.oobbuf);
426 return ret;
427 }
428
429 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
430 uint32_t length, void __user *ptr, uint32_t __user *retp)
431 {
432 struct mtd_oob_ops ops;
433 int ret = 0;
434
435 if (length > 4096)
436 return -EINVAL;
437
438 if (!mtd->read_oob)
439 ret = -EOPNOTSUPP;
440 else
441 ret = access_ok(VERIFY_WRITE, ptr,
442 length) ? 0 : -EFAULT;
443 if (ret)
444 return ret;
445
446 ops.ooblen = length;
447 ops.ooboffs = start & (mtd->oobsize - 1);
448 ops.datbuf = NULL;
449 ops.mode = MTD_OOB_PLACE;
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->oobsize - 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 return ret;
469 }
470
471 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
472 {
473 struct mtd_file_info *mfi = file->private_data;
474 struct mtd_info *mtd = mfi->mtd;
475 void __user *argp = (void __user *)arg;
476 int ret = 0;
477 u_long size;
478 struct mtd_info_user info;
479
480 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
481
482 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
483 if (cmd & IOC_IN) {
484 if (!access_ok(VERIFY_READ, argp, size))
485 return -EFAULT;
486 }
487 if (cmd & IOC_OUT) {
488 if (!access_ok(VERIFY_WRITE, argp, size))
489 return -EFAULT;
490 }
491
492 switch (cmd) {
493 case MEMGETREGIONCOUNT:
494 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
495 return -EFAULT;
496 break;
497
498 case MEMGETREGIONINFO:
499 {
500 uint32_t ur_idx;
501 struct mtd_erase_region_info *kr;
502 struct region_info_user __user *ur = argp;
503
504 if (get_user(ur_idx, &(ur->regionindex)))
505 return -EFAULT;
506
507 kr = &(mtd->eraseregions[ur_idx]);
508
509 if (put_user(kr->offset, &(ur->offset))
510 || put_user(kr->erasesize, &(ur->erasesize))
511 || put_user(kr->numblocks, &(ur->numblocks)))
512 return -EFAULT;
513
514 break;
515 }
516
517 case MEMGETINFO:
518 info.type = mtd->type;
519 info.flags = mtd->flags;
520 info.size = mtd->size;
521 info.erasesize = mtd->erasesize;
522 info.writesize = mtd->writesize;
523 info.oobsize = mtd->oobsize;
524 /* The below fields are obsolete */
525 info.ecctype = -1;
526 info.eccsize = 0;
527 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
528 return -EFAULT;
529 break;
530
531 case MEMERASE:
532 case MEMERASE64:
533 {
534 struct erase_info *erase;
535
536 if(!(file->f_mode & FMODE_WRITE))
537 return -EPERM;
538
539 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
540 if (!erase)
541 ret = -ENOMEM;
542 else {
543 wait_queue_head_t waitq;
544 DECLARE_WAITQUEUE(wait, current);
545
546 init_waitqueue_head(&waitq);
547
548 if (cmd == MEMERASE64) {
549 struct erase_info_user64 einfo64;
550
551 if (copy_from_user(&einfo64, argp,
552 sizeof(struct erase_info_user64))) {
553 kfree(erase);
554 return -EFAULT;
555 }
556 erase->addr = einfo64.start;
557 erase->len = einfo64.length;
558 } else {
559 struct erase_info_user einfo32;
560
561 if (copy_from_user(&einfo32, argp,
562 sizeof(struct erase_info_user))) {
563 kfree(erase);
564 return -EFAULT;
565 }
566 erase->addr = einfo32.start;
567 erase->len = einfo32.length;
568 }
569 erase->mtd = mtd;
570 erase->callback = mtdchar_erase_callback;
571 erase->priv = (unsigned long)&waitq;
572
573 /*
574 FIXME: Allow INTERRUPTIBLE. Which means
575 not having the wait_queue head on the stack.
576
577 If the wq_head is on the stack, and we
578 leave because we got interrupted, then the
579 wq_head is no longer there when the
580 callback routine tries to wake us up.
581 */
582 ret = mtd->erase(mtd, erase);
583 if (!ret) {
584 set_current_state(TASK_UNINTERRUPTIBLE);
585 add_wait_queue(&waitq, &wait);
586 if (erase->state != MTD_ERASE_DONE &&
587 erase->state != MTD_ERASE_FAILED)
588 schedule();
589 remove_wait_queue(&waitq, &wait);
590 set_current_state(TASK_RUNNING);
591
592 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
593 }
594 kfree(erase);
595 }
596 break;
597 }
598
599 case MEMWRITEOOB:
600 {
601 struct mtd_oob_buf buf;
602 struct mtd_oob_buf __user *buf_user = argp;
603
604 /* NOTE: writes return length to buf_user->length */
605 if (copy_from_user(&buf, argp, sizeof(buf)))
606 ret = -EFAULT;
607 else
608 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
609 buf.ptr, &buf_user->length);
610 break;
611 }
612
613 case MEMREADOOB:
614 {
615 struct mtd_oob_buf buf;
616 struct mtd_oob_buf __user *buf_user = argp;
617
618 /* NOTE: writes return length to buf_user->start */
619 if (copy_from_user(&buf, argp, sizeof(buf)))
620 ret = -EFAULT;
621 else
622 ret = mtd_do_readoob(mtd, buf.start, buf.length,
623 buf.ptr, &buf_user->start);
624 break;
625 }
626
627 case MEMWRITEOOB64:
628 {
629 struct mtd_oob_buf64 buf;
630 struct mtd_oob_buf64 __user *buf_user = argp;
631
632 if (copy_from_user(&buf, argp, sizeof(buf)))
633 ret = -EFAULT;
634 else
635 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
636 (void __user *)(uintptr_t)buf.usr_ptr,
637 &buf_user->length);
638 break;
639 }
640
641 case MEMREADOOB64:
642 {
643 struct mtd_oob_buf64 buf;
644 struct mtd_oob_buf64 __user *buf_user = argp;
645
646 if (copy_from_user(&buf, argp, sizeof(buf)))
647 ret = -EFAULT;
648 else
649 ret = mtd_do_readoob(mtd, buf.start, buf.length,
650 (void __user *)(uintptr_t)buf.usr_ptr,
651 &buf_user->length);
652 break;
653 }
654
655 case MEMLOCK:
656 {
657 struct erase_info_user einfo;
658
659 if (copy_from_user(&einfo, argp, sizeof(einfo)))
660 return -EFAULT;
661
662 if (!mtd->lock)
663 ret = -EOPNOTSUPP;
664 else
665 ret = mtd->lock(mtd, einfo.start, einfo.length);
666 break;
667 }
668
669 case MEMUNLOCK:
670 {
671 struct erase_info_user einfo;
672
673 if (copy_from_user(&einfo, argp, sizeof(einfo)))
674 return -EFAULT;
675
676 if (!mtd->unlock)
677 ret = -EOPNOTSUPP;
678 else
679 ret = mtd->unlock(mtd, einfo.start, einfo.length);
680 break;
681 }
682
683 /* Legacy interface */
684 case MEMGETOOBSEL:
685 {
686 struct nand_oobinfo oi;
687
688 if (!mtd->ecclayout)
689 return -EOPNOTSUPP;
690 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
691 return -EINVAL;
692
693 oi.useecc = MTD_NANDECC_AUTOPLACE;
694 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
695 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
696 sizeof(oi.oobfree));
697 oi.eccbytes = mtd->ecclayout->eccbytes;
698
699 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
700 return -EFAULT;
701 break;
702 }
703
704 case MEMGETBADBLOCK:
705 {
706 loff_t offs;
707
708 if (copy_from_user(&offs, argp, sizeof(loff_t)))
709 return -EFAULT;
710 if (!mtd->block_isbad)
711 ret = -EOPNOTSUPP;
712 else
713 return mtd->block_isbad(mtd, offs);
714 break;
715 }
716
717 case MEMSETBADBLOCK:
718 {
719 loff_t offs;
720
721 if (copy_from_user(&offs, argp, sizeof(loff_t)))
722 return -EFAULT;
723 if (!mtd->block_markbad)
724 ret = -EOPNOTSUPP;
725 else
726 return mtd->block_markbad(mtd, offs);
727 break;
728 }
729
730 #ifdef CONFIG_HAVE_MTD_OTP
731 case OTPSELECT:
732 {
733 int mode;
734 if (copy_from_user(&mode, argp, sizeof(int)))
735 return -EFAULT;
736
737 mfi->mode = MTD_MODE_NORMAL;
738
739 ret = otp_select_filemode(mfi, mode);
740
741 file->f_pos = 0;
742 break;
743 }
744
745 case OTPGETREGIONCOUNT:
746 case OTPGETREGIONINFO:
747 {
748 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
749 if (!buf)
750 return -ENOMEM;
751 ret = -EOPNOTSUPP;
752 switch (mfi->mode) {
753 case MTD_MODE_OTP_FACTORY:
754 if (mtd->get_fact_prot_info)
755 ret = mtd->get_fact_prot_info(mtd, buf, 4096);
756 break;
757 case MTD_MODE_OTP_USER:
758 if (mtd->get_user_prot_info)
759 ret = mtd->get_user_prot_info(mtd, buf, 4096);
760 break;
761 default:
762 break;
763 }
764 if (ret >= 0) {
765 if (cmd == OTPGETREGIONCOUNT) {
766 int nbr = ret / sizeof(struct otp_info);
767 ret = copy_to_user(argp, &nbr, sizeof(int));
768 } else
769 ret = copy_to_user(argp, buf, ret);
770 if (ret)
771 ret = -EFAULT;
772 }
773 kfree(buf);
774 break;
775 }
776
777 case OTPLOCK:
778 {
779 struct otp_info oinfo;
780
781 if (mfi->mode != MTD_MODE_OTP_USER)
782 return -EINVAL;
783 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
784 return -EFAULT;
785 if (!mtd->lock_user_prot_reg)
786 return -EOPNOTSUPP;
787 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
788 break;
789 }
790 #endif
791
792 case ECCGETLAYOUT:
793 {
794 if (!mtd->ecclayout)
795 return -EOPNOTSUPP;
796
797 if (copy_to_user(argp, mtd->ecclayout,
798 sizeof(struct nand_ecclayout)))
799 return -EFAULT;
800 break;
801 }
802
803 case ECCGETSTATS:
804 {
805 if (copy_to_user(argp, &mtd->ecc_stats,
806 sizeof(struct mtd_ecc_stats)))
807 return -EFAULT;
808 break;
809 }
810
811 case MTDFILEMODE:
812 {
813 mfi->mode = 0;
814
815 switch(arg) {
816 case MTD_MODE_OTP_FACTORY:
817 case MTD_MODE_OTP_USER:
818 ret = otp_select_filemode(mfi, arg);
819 break;
820
821 case MTD_MODE_RAW:
822 if (!mtd->read_oob || !mtd->write_oob)
823 return -EOPNOTSUPP;
824 mfi->mode = arg;
825
826 case MTD_MODE_NORMAL:
827 break;
828 default:
829 ret = -EINVAL;
830 }
831 file->f_pos = 0;
832 break;
833 }
834
835 default:
836 ret = -ENOTTY;
837 }
838
839 return ret;
840 } /* memory_ioctl */
841
842 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
843 {
844 int ret;
845
846 lock_kernel();
847 ret = mtd_ioctl(file, cmd, arg);
848 unlock_kernel();
849
850 return ret;
851 }
852
853 #ifdef CONFIG_COMPAT
854
855 struct mtd_oob_buf32 {
856 u_int32_t start;
857 u_int32_t length;
858 compat_caddr_t ptr; /* unsigned char* */
859 };
860
861 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
862 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
863
864 static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
865 unsigned long arg)
866 {
867 struct mtd_file_info *mfi = file->private_data;
868 struct mtd_info *mtd = mfi->mtd;
869 void __user *argp = compat_ptr(arg);
870 int ret = 0;
871
872 lock_kernel();
873
874 switch (cmd) {
875 case MEMWRITEOOB32:
876 {
877 struct mtd_oob_buf32 buf;
878 struct mtd_oob_buf32 __user *buf_user = argp;
879
880 if (copy_from_user(&buf, argp, sizeof(buf)))
881 ret = -EFAULT;
882 else
883 ret = mtd_do_writeoob(file, mtd, buf.start,
884 buf.length, compat_ptr(buf.ptr),
885 &buf_user->length);
886 break;
887 }
888
889 case MEMREADOOB32:
890 {
891 struct mtd_oob_buf32 buf;
892 struct mtd_oob_buf32 __user *buf_user = argp;
893
894 /* NOTE: writes return length to buf->start */
895 if (copy_from_user(&buf, argp, sizeof(buf)))
896 ret = -EFAULT;
897 else
898 ret = mtd_do_readoob(mtd, buf.start,
899 buf.length, compat_ptr(buf.ptr),
900 &buf_user->start);
901 break;
902 }
903 default:
904 ret = mtd_ioctl(file, cmd, (unsigned long)argp);
905 }
906
907 unlock_kernel();
908
909 return ret;
910 }
911
912 #endif /* CONFIG_COMPAT */
913
914 /*
915 * try to determine where a shared mapping can be made
916 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
917 * mappings)
918 */
919 #ifndef CONFIG_MMU
920 static unsigned long mtd_get_unmapped_area(struct file *file,
921 unsigned long addr,
922 unsigned long len,
923 unsigned long pgoff,
924 unsigned long flags)
925 {
926 struct mtd_file_info *mfi = file->private_data;
927 struct mtd_info *mtd = mfi->mtd;
928
929 if (mtd->get_unmapped_area) {
930 unsigned long offset;
931
932 if (addr != 0)
933 return (unsigned long) -EINVAL;
934
935 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
936 return (unsigned long) -EINVAL;
937
938 offset = pgoff << PAGE_SHIFT;
939 if (offset > mtd->size - len)
940 return (unsigned long) -EINVAL;
941
942 return mtd->get_unmapped_area(mtd, len, offset, flags);
943 }
944
945 /* can't map directly */
946 return (unsigned long) -ENOSYS;
947 }
948 #endif
949
950 /*
951 * set up a mapping for shared memory segments
952 */
953 static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
954 {
955 #ifdef CONFIG_MMU
956 struct mtd_file_info *mfi = file->private_data;
957 struct mtd_info *mtd = mfi->mtd;
958
959 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM)
960 return 0;
961 return -ENOSYS;
962 #else
963 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
964 #endif
965 }
966
967 static const struct file_operations mtd_fops = {
968 .owner = THIS_MODULE,
969 .llseek = mtd_lseek,
970 .read = mtd_read,
971 .write = mtd_write,
972 .unlocked_ioctl = mtd_unlocked_ioctl,
973 #ifdef CONFIG_COMPAT
974 .compat_ioctl = mtd_compat_ioctl,
975 #endif
976 .open = mtd_open,
977 .release = mtd_close,
978 .mmap = mtd_mmap,
979 #ifndef CONFIG_MMU
980 .get_unmapped_area = mtd_get_unmapped_area,
981 #endif
982 };
983
984 static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags,
985 const char *dev_name, void *data,
986 struct vfsmount *mnt)
987 {
988 return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
989 mnt);
990 }
991
992 static struct file_system_type mtd_inodefs_type = {
993 .name = "mtd_inodefs",
994 .get_sb = mtd_inodefs_get_sb,
995 .kill_sb = kill_anon_super,
996 };
997
998 static void mtdchar_notify_add(struct mtd_info *mtd)
999 {
1000 }
1001
1002 static void mtdchar_notify_remove(struct mtd_info *mtd)
1003 {
1004 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
1005
1006 if (mtd_ino) {
1007 /* Destroy the inode if it exists */
1008 mtd_ino->i_nlink = 0;
1009 iput(mtd_ino);
1010 }
1011 }
1012
1013 static struct mtd_notifier mtdchar_notifier = {
1014 .add = mtdchar_notify_add,
1015 .remove = mtdchar_notify_remove,
1016 };
1017
1018 static int __init init_mtdchar(void)
1019 {
1020 int ret;
1021
1022 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1023 "mtd", &mtd_fops);
1024 if (ret < 0) {
1025 pr_notice("Can't allocate major number %d for "
1026 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1027 return ret;
1028 }
1029
1030 ret = register_filesystem(&mtd_inodefs_type);
1031 if (ret) {
1032 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1033 goto err_unregister_chdev;
1034 }
1035
1036 mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
1037 if (IS_ERR(mtd_inode_mnt)) {
1038 ret = PTR_ERR(mtd_inode_mnt);
1039 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
1040 goto err_unregister_filesystem;
1041 }
1042 register_mtd_user(&mtdchar_notifier);
1043
1044 return ret;
1045
1046 err_unregister_filesystem:
1047 unregister_filesystem(&mtd_inodefs_type);
1048 err_unregister_chdev:
1049 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1050 return ret;
1051 }
1052
1053 static void __exit cleanup_mtdchar(void)
1054 {
1055 unregister_mtd_user(&mtdchar_notifier);
1056 mntput(mtd_inode_mnt);
1057 unregister_filesystem(&mtd_inodefs_type);
1058 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1059 }
1060
1061 module_init(init_mtdchar);
1062 module_exit(cleanup_mtdchar);
1063
1064 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1065
1066 MODULE_LICENSE("GPL");
1067 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1068 MODULE_DESCRIPTION("Direct character-device access to MTD devices");
1069 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linux with added FPC-III support