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PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / mtd / mtdchar.c
blob2147e733533b611a44c88ca3d53efee5ae8f5e01
1 /*
2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 */
19
20 #include <linux/device.h>
21 #include <linux/fs.h>
22 #include <linux/mm.h>
23 #include <linux/err.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/sched.h>
29 #include <linux/mutex.h>
30 #include <linux/backing-dev.h>
31 #include <linux/compat.h>
32 #include <linux/mount.h>
33 #include <linux/blkpg.h>
34 #include <linux/magic.h>
35 #include <linux/major.h>
36 #include <linux/mtd/mtd.h>
37 #include <linux/mtd/partitions.h>
38 #include <linux/mtd/map.h>
39
40 #include <asm/uaccess.h>
41
42 #include "mtdcore.h"
43
44 static DEFINE_MUTEX(mtd_mutex);
45
46 /*
47 * Data structure to hold the pointer to the mtd device as well
48 * as mode information of various use cases.
49 */
50 struct mtd_file_info {
51 struct mtd_info *mtd;
52 struct inode *ino;
53 enum mtd_file_modes mode;
54 };
55
56 static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
57 {
58 struct mtd_file_info *mfi = file->private_data;
59 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
60 }
61
62 static int count;
63 static struct vfsmount *mnt;
64 static struct file_system_type mtd_inodefs_type;
65
66 static int mtdchar_open(struct inode *inode, struct file *file)
67 {
68 int minor = iminor(inode);
69 int devnum = minor >> 1;
70 int ret = 0;
71 struct mtd_info *mtd;
72 struct mtd_file_info *mfi;
73 struct inode *mtd_ino;
74
75 pr_debug("MTD_open\n");
76
77 /* You can't open the RO devices RW */
78 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
79 return -EACCES;
80
81 ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count);
82 if (ret)
83 return ret;
84
85 mutex_lock(&mtd_mutex);
86 mtd = get_mtd_device(NULL, devnum);
87
88 if (IS_ERR(mtd)) {
89 ret = PTR_ERR(mtd);
90 goto out;
91 }
92
93 if (mtd->type == MTD_ABSENT) {
94 ret = -ENODEV;
95 goto out1;
96 }
97
98 mtd_ino = iget_locked(mnt->mnt_sb, devnum);
99 if (!mtd_ino) {
100 ret = -ENOMEM;
101 goto out1;
102 }
103 if (mtd_ino->i_state & I_NEW) {
104 mtd_ino->i_private = mtd;
105 mtd_ino->i_mode = S_IFCHR;
106 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
107 unlock_new_inode(mtd_ino);
108 }
109 file->f_mapping = mtd_ino->i_mapping;
110
111 /* You can't open it RW if it's not a writeable device */
112 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
113 ret = -EACCES;
114 goto out2;
115 }
116
117 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
118 if (!mfi) {
119 ret = -ENOMEM;
120 goto out2;
121 }
122 mfi->ino = mtd_ino;
123 mfi->mtd = mtd;
124 file->private_data = mfi;
125 mutex_unlock(&mtd_mutex);
126 return 0;
127
128 out2:
129 iput(mtd_ino);
130 out1:
131 put_mtd_device(mtd);
132 out:
133 mutex_unlock(&mtd_mutex);
134 simple_release_fs(&mnt, &count);
135 return ret;
136 } /* mtdchar_open */
137
138 /*====================================================================*/
139
140 static int mtdchar_close(struct inode *inode, struct file *file)
141 {
142 struct mtd_file_info *mfi = file->private_data;
143 struct mtd_info *mtd = mfi->mtd;
144
145 pr_debug("MTD_close\n");
146
147 /* Only sync if opened RW */
148 if ((file->f_mode & FMODE_WRITE))
149 mtd_sync(mtd);
150
151 iput(mfi->ino);
152
153 put_mtd_device(mtd);
154 file->private_data = NULL;
155 kfree(mfi);
156 simple_release_fs(&mnt, &count);
157
158 return 0;
159 } /* mtdchar_close */
160
161 /* Back in June 2001, dwmw2 wrote:
162 *
163 * FIXME: This _really_ needs to die. In 2.5, we should lock the
164 * userspace buffer down and use it directly with readv/writev.
165 *
166 * The implementation below, using mtd_kmalloc_up_to, mitigates
167 * allocation failures when the system is under low-memory situations
168 * or if memory is highly fragmented at the cost of reducing the
169 * performance of the requested transfer due to a smaller buffer size.
170 *
171 * A more complex but more memory-efficient implementation based on
172 * get_user_pages and iovecs to cover extents of those pages is a
173 * longer-term goal, as intimated by dwmw2 above. However, for the
174 * write case, this requires yet more complex head and tail transfer
175 * handling when those head and tail offsets and sizes are such that
176 * alignment requirements are not met in the NAND subdriver.
177 */
178
179 static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
180 loff_t *ppos)
181 {
182 struct mtd_file_info *mfi = file->private_data;
183 struct mtd_info *mtd = mfi->mtd;
184 size_t retlen;
185 size_t total_retlen=0;
186 int ret=0;
187 int len;
188 size_t size = count;
189 char *kbuf;
190
191 pr_debug("MTD_read\n");
192
193 if (*ppos + count > mtd->size)
194 count = mtd->size - *ppos;
195
196 if (!count)
197 return 0;
198
199 kbuf = mtd_kmalloc_up_to(mtd, &size);
200 if (!kbuf)
201 return -ENOMEM;
202
203 while (count) {
204 len = min_t(size_t, count, size);
205
206 switch (mfi->mode) {
207 case MTD_FILE_MODE_OTP_FACTORY:
208 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
209 &retlen, kbuf);
210 break;
211 case MTD_FILE_MODE_OTP_USER:
212 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
213 &retlen, kbuf);
214 break;
215 case MTD_FILE_MODE_RAW:
216 {
217 struct mtd_oob_ops ops;
218
219 ops.mode = MTD_OPS_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 occurred 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 || mtd_is_bitflip_or_eccerr(ret)) {
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 } /* mtdchar_read */
264
265 static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
266 loff_t *ppos)
267 {
268 struct mtd_file_info *mfi = file->private_data;
269 struct mtd_info *mtd = mfi->mtd;
270 size_t size = count;
271 char *kbuf;
272 size_t retlen;
273 size_t total_retlen=0;
274 int ret=0;
275 int len;
276
277 pr_debug("MTD_write\n");
278
279 if (*ppos == mtd->size)
280 return -ENOSPC;
281
282 if (*ppos + count > mtd->size)
283 count = mtd->size - *ppos;
284
285 if (!count)
286 return 0;
287
288 kbuf = mtd_kmalloc_up_to(mtd, &size);
289 if (!kbuf)
290 return -ENOMEM;
291
292 while (count) {
293 len = min_t(size_t, count, size);
294
295 if (copy_from_user(kbuf, buf, len)) {
296 kfree(kbuf);
297 return -EFAULT;
298 }
299
300 switch (mfi->mode) {
301 case MTD_FILE_MODE_OTP_FACTORY:
302 ret = -EROFS;
303 break;
304 case MTD_FILE_MODE_OTP_USER:
305 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
306 &retlen, kbuf);
307 break;
308
309 case MTD_FILE_MODE_RAW:
310 {
311 struct mtd_oob_ops ops;
312
313 ops.mode = MTD_OPS_RAW;
314 ops.datbuf = kbuf;
315 ops.oobbuf = NULL;
316 ops.ooboffs = 0;
317 ops.len = len;
318
319 ret = mtd_write_oob(mtd, *ppos, &ops);
320 retlen = ops.retlen;
321 break;
322 }
323
324 default:
325 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
326 }
327 if (!ret) {
328 *ppos += retlen;
329 total_retlen += retlen;
330 count -= retlen;
331 buf += retlen;
332 }
333 else {
334 kfree(kbuf);
335 return ret;
336 }
337 }
338
339 kfree(kbuf);
340 return total_retlen;
341 } /* mtdchar_write */
342
343 /*======================================================================
344
345 IOCTL calls for getting device parameters.
346
347 ======================================================================*/
348 static void mtdchar_erase_callback (struct erase_info *instr)
349 {
350 wake_up((wait_queue_head_t *)instr->priv);
351 }
352
353 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
354 {
355 struct mtd_info *mtd = mfi->mtd;
356 size_t retlen;
357
358 switch (mode) {
359 case MTD_OTP_FACTORY:
360 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
361 -EOPNOTSUPP)
362 return -EOPNOTSUPP;
363
364 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
365 break;
366 case MTD_OTP_USER:
367 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
368 -EOPNOTSUPP)
369 return -EOPNOTSUPP;
370
371 mfi->mode = MTD_FILE_MODE_OTP_USER;
372 break;
373 case MTD_OTP_OFF:
374 mfi->mode = MTD_FILE_MODE_NORMAL;
375 break;
376 default:
377 return -EINVAL;
378 }
379
380 return 0;
381 }
382
383 static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
384 uint64_t start, uint32_t length, void __user *ptr,
385 uint32_t __user *retp)
386 {
387 struct mtd_file_info *mfi = file->private_data;
388 struct mtd_oob_ops ops;
389 uint32_t retlen;
390 int ret = 0;
391
392 if (!(file->f_mode & FMODE_WRITE))
393 return -EPERM;
394
395 if (length > 4096)
396 return -EINVAL;
397
398 if (!mtd->_write_oob)
399 ret = -EOPNOTSUPP;
400 else
401 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
402
403 if (ret)
404 return ret;
405
406 ops.ooblen = length;
407 ops.ooboffs = start & (mtd->writesize - 1);
408 ops.datbuf = NULL;
409 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
410 MTD_OPS_PLACE_OOB;
411
412 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
413 return -EINVAL;
414
415 ops.oobbuf = memdup_user(ptr, length);
416 if (IS_ERR(ops.oobbuf))
417 return PTR_ERR(ops.oobbuf);
418
419 start &= ~((uint64_t)mtd->writesize - 1);
420 ret = mtd_write_oob(mtd, start, &ops);
421
422 if (ops.oobretlen > 0xFFFFFFFFU)
423 ret = -EOVERFLOW;
424 retlen = ops.oobretlen;
425 if (copy_to_user(retp, &retlen, sizeof(length)))
426 ret = -EFAULT;
427
428 kfree(ops.oobbuf);
429 return ret;
430 }
431
432 static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
433 uint64_t start, uint32_t length, void __user *ptr,
434 uint32_t __user *retp)
435 {
436 struct mtd_file_info *mfi = file->private_data;
437 struct mtd_oob_ops ops;
438 int ret = 0;
439
440 if (length > 4096)
441 return -EINVAL;
442
443 if (!access_ok(VERIFY_WRITE, ptr, length))
444 return -EFAULT;
445
446 ops.ooblen = length;
447 ops.ooboffs = start & (mtd->writesize - 1);
448 ops.datbuf = NULL;
449 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
450 MTD_OPS_PLACE_OOB;
451
452 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
453 return -EINVAL;
454
455 ops.oobbuf = kmalloc(length, GFP_KERNEL);
456 if (!ops.oobbuf)
457 return -ENOMEM;
458
459 start &= ~((uint64_t)mtd->writesize - 1);
460 ret = mtd_read_oob(mtd, start, &ops);
461
462 if (put_user(ops.oobretlen, retp))
463 ret = -EFAULT;
464 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
465 ops.oobretlen))
466 ret = -EFAULT;
467
468 kfree(ops.oobbuf);
469
470 /*
471 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
472 * data. For our userspace tools it is important to dump areas
473 * with ECC errors!
474 * For kernel internal usage it also might return -EUCLEAN
475 * to signal the caller that a bitflip has occured and has
476 * been corrected by the ECC algorithm.
477 *
478 * Note: currently the standard NAND function, nand_read_oob_std,
479 * does not calculate ECC for the OOB area, so do not rely on
480 * this behavior unless you have replaced it with your own.
481 */
482 if (mtd_is_bitflip_or_eccerr(ret))
483 return 0;
484
485 return ret;
486 }
487
488 /*
489 * Copies (and truncates, if necessary) data from the larger struct,
490 * nand_ecclayout, to the smaller, deprecated layout struct,
491 * nand_ecclayout_user. This is necessary only to support the deprecated
492 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
493 * nand_ecclayout flexibly (i.e. the struct may change size in new
494 * releases without requiring major rewrites).
495 */
496 static int shrink_ecclayout(const struct nand_ecclayout *from,
497 struct nand_ecclayout_user *to)
498 {
499 int i;
500
501 if (!from || !to)
502 return -EINVAL;
503
504 memset(to, 0, sizeof(*to));
505
506 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
507 for (i = 0; i < to->eccbytes; i++)
508 to->eccpos[i] = from->eccpos[i];
509
510 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
511 if (from->oobfree[i].length == 0 &&
512 from->oobfree[i].offset == 0)
513 break;
514 to->oobavail += from->oobfree[i].length;
515 to->oobfree[i] = from->oobfree[i];
516 }
517
518 return 0;
519 }
520
521 static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
522 struct blkpg_ioctl_arg __user *arg)
523 {
524 struct blkpg_ioctl_arg a;
525 struct blkpg_partition p;
526
527 if (!capable(CAP_SYS_ADMIN))
528 return -EPERM;
529
530 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
531 return -EFAULT;
532
533 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
534 return -EFAULT;
535
536 switch (a.op) {
537 case BLKPG_ADD_PARTITION:
538
539 /* Only master mtd device must be used to add partitions */
540 if (mtd_is_partition(mtd))
541 return -EINVAL;
542
543 return mtd_add_partition(mtd, p.devname, p.start, p.length);
544
545 case BLKPG_DEL_PARTITION:
546
547 if (p.pno < 0)
548 return -EINVAL;
549
550 return mtd_del_partition(mtd, p.pno);
551
552 default:
553 return -EINVAL;
554 }
555 }
556
557 static int mtdchar_write_ioctl(struct mtd_info *mtd,
558 struct mtd_write_req __user *argp)
559 {
560 struct mtd_write_req req;
561 struct mtd_oob_ops ops;
562 void __user *usr_data, *usr_oob;
563 int ret;
564
565 if (copy_from_user(&req, argp, sizeof(req)) ||
566 !access_ok(VERIFY_READ, req.usr_data, req.len) ||
567 !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
568 return -EFAULT;
569 if (!mtd->_write_oob)
570 return -EOPNOTSUPP;
571
572 ops.mode = req.mode;
573 ops.len = (size_t)req.len;
574 ops.ooblen = (size_t)req.ooblen;
575 ops.ooboffs = 0;
576
577 usr_data = (void __user *)(uintptr_t)req.usr_data;
578 usr_oob = (void __user *)(uintptr_t)req.usr_oob;
579
580 if (req.usr_data) {
581 ops.datbuf = memdup_user(usr_data, ops.len);
582 if (IS_ERR(ops.datbuf))
583 return PTR_ERR(ops.datbuf);
584 } else {
585 ops.datbuf = NULL;
586 }
587
588 if (req.usr_oob) {
589 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
590 if (IS_ERR(ops.oobbuf)) {
591 kfree(ops.datbuf);
592 return PTR_ERR(ops.oobbuf);
593 }
594 } else {
595 ops.oobbuf = NULL;
596 }
597
598 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
599
600 kfree(ops.datbuf);
601 kfree(ops.oobbuf);
602
603 return ret;
604 }
605
606 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
607 {
608 struct mtd_file_info *mfi = file->private_data;
609 struct mtd_info *mtd = mfi->mtd;
610 void __user *argp = (void __user *)arg;
611 int ret = 0;
612 u_long size;
613 struct mtd_info_user info;
614
615 pr_debug("MTD_ioctl\n");
616
617 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
618 if (cmd & IOC_IN) {
619 if (!access_ok(VERIFY_READ, argp, size))
620 return -EFAULT;
621 }
622 if (cmd & IOC_OUT) {
623 if (!access_ok(VERIFY_WRITE, argp, size))
624 return -EFAULT;
625 }
626
627 switch (cmd) {
628 case MEMGETREGIONCOUNT:
629 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
630 return -EFAULT;
631 break;
632
633 case MEMGETREGIONINFO:
634 {
635 uint32_t ur_idx;
636 struct mtd_erase_region_info *kr;
637 struct region_info_user __user *ur = argp;
638
639 if (get_user(ur_idx, &(ur->regionindex)))
640 return -EFAULT;
641
642 if (ur_idx >= mtd->numeraseregions)
643 return -EINVAL;
644
645 kr = &(mtd->eraseregions[ur_idx]);
646
647 if (put_user(kr->offset, &(ur->offset))
648 || put_user(kr->erasesize, &(ur->erasesize))
649 || put_user(kr->numblocks, &(ur->numblocks)))
650 return -EFAULT;
651
652 break;
653 }
654
655 case MEMGETINFO:
656 memset(&info, 0, sizeof(info));
657 info.type = mtd->type;
658 info.flags = mtd->flags;
659 info.size = mtd->size;
660 info.erasesize = mtd->erasesize;
661 info.writesize = mtd->writesize;
662 info.oobsize = mtd->oobsize;
663 /* The below field is obsolete */
664 info.padding = 0;
665 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
666 return -EFAULT;
667 break;
668
669 case MEMERASE:
670 case MEMERASE64:
671 {
672 struct erase_info *erase;
673
674 if(!(file->f_mode & FMODE_WRITE))
675 return -EPERM;
676
677 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
678 if (!erase)
679 ret = -ENOMEM;
680 else {
681 wait_queue_head_t waitq;
682 DECLARE_WAITQUEUE(wait, current);
683
684 init_waitqueue_head(&waitq);
685
686 if (cmd == MEMERASE64) {
687 struct erase_info_user64 einfo64;
688
689 if (copy_from_user(&einfo64, argp,
690 sizeof(struct erase_info_user64))) {
691 kfree(erase);
692 return -EFAULT;
693 }
694 erase->addr = einfo64.start;
695 erase->len = einfo64.length;
696 } else {
697 struct erase_info_user einfo32;
698
699 if (copy_from_user(&einfo32, argp,
700 sizeof(struct erase_info_user))) {
701 kfree(erase);
702 return -EFAULT;
703 }
704 erase->addr = einfo32.start;
705 erase->len = einfo32.length;
706 }
707 erase->mtd = mtd;
708 erase->callback = mtdchar_erase_callback;
709 erase->priv = (unsigned long)&waitq;
710
711 /*
712 FIXME: Allow INTERRUPTIBLE. Which means
713 not having the wait_queue head on the stack.
714
715 If the wq_head is on the stack, and we
716 leave because we got interrupted, then the
717 wq_head is no longer there when the
718 callback routine tries to wake us up.
719 */
720 ret = mtd_erase(mtd, erase);
721 if (!ret) {
722 set_current_state(TASK_UNINTERRUPTIBLE);
723 add_wait_queue(&waitq, &wait);
724 if (erase->state != MTD_ERASE_DONE &&
725 erase->state != MTD_ERASE_FAILED)
726 schedule();
727 remove_wait_queue(&waitq, &wait);
728 set_current_state(TASK_RUNNING);
729
730 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
731 }
732 kfree(erase);
733 }
734 break;
735 }
736
737 case MEMWRITEOOB:
738 {
739 struct mtd_oob_buf buf;
740 struct mtd_oob_buf __user *buf_user = argp;
741
742 /* NOTE: writes return length to buf_user->length */
743 if (copy_from_user(&buf, argp, sizeof(buf)))
744 ret = -EFAULT;
745 else
746 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
747 buf.ptr, &buf_user->length);
748 break;
749 }
750
751 case MEMREADOOB:
752 {
753 struct mtd_oob_buf buf;
754 struct mtd_oob_buf __user *buf_user = argp;
755
756 /* NOTE: writes return length to buf_user->start */
757 if (copy_from_user(&buf, argp, sizeof(buf)))
758 ret = -EFAULT;
759 else
760 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
761 buf.ptr, &buf_user->start);
762 break;
763 }
764
765 case MEMWRITEOOB64:
766 {
767 struct mtd_oob_buf64 buf;
768 struct mtd_oob_buf64 __user *buf_user = argp;
769
770 if (copy_from_user(&buf, argp, sizeof(buf)))
771 ret = -EFAULT;
772 else
773 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
774 (void __user *)(uintptr_t)buf.usr_ptr,
775 &buf_user->length);
776 break;
777 }
778
779 case MEMREADOOB64:
780 {
781 struct mtd_oob_buf64 buf;
782 struct mtd_oob_buf64 __user *buf_user = argp;
783
784 if (copy_from_user(&buf, argp, sizeof(buf)))
785 ret = -EFAULT;
786 else
787 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
788 (void __user *)(uintptr_t)buf.usr_ptr,
789 &buf_user->length);
790 break;
791 }
792
793 case MEMWRITE:
794 {
795 ret = mtdchar_write_ioctl(mtd,
796 (struct mtd_write_req __user *)arg);
797 break;
798 }
799
800 case MEMLOCK:
801 {
802 struct erase_info_user einfo;
803
804 if (copy_from_user(&einfo, argp, sizeof(einfo)))
805 return -EFAULT;
806
807 ret = mtd_lock(mtd, einfo.start, einfo.length);
808 break;
809 }
810
811 case MEMUNLOCK:
812 {
813 struct erase_info_user einfo;
814
815 if (copy_from_user(&einfo, argp, sizeof(einfo)))
816 return -EFAULT;
817
818 ret = mtd_unlock(mtd, einfo.start, einfo.length);
819 break;
820 }
821
822 case MEMISLOCKED:
823 {
824 struct erase_info_user einfo;
825
826 if (copy_from_user(&einfo, argp, sizeof(einfo)))
827 return -EFAULT;
828
829 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
830 break;
831 }
832
833 /* Legacy interface */
834 case MEMGETOOBSEL:
835 {
836 struct nand_oobinfo oi;
837
838 if (!mtd->ecclayout)
839 return -EOPNOTSUPP;
840 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
841 return -EINVAL;
842
843 oi.useecc = MTD_NANDECC_AUTOPLACE;
844 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
845 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
846 sizeof(oi.oobfree));
847 oi.eccbytes = mtd->ecclayout->eccbytes;
848
849 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
850 return -EFAULT;
851 break;
852 }
853
854 case MEMGETBADBLOCK:
855 {
856 loff_t offs;
857
858 if (copy_from_user(&offs, argp, sizeof(loff_t)))
859 return -EFAULT;
860 return mtd_block_isbad(mtd, offs);
861 break;
862 }
863
864 case MEMSETBADBLOCK:
865 {
866 loff_t offs;
867
868 if (copy_from_user(&offs, argp, sizeof(loff_t)))
869 return -EFAULT;
870 return mtd_block_markbad(mtd, offs);
871 break;
872 }
873
874 case OTPSELECT:
875 {
876 int mode;
877 if (copy_from_user(&mode, argp, sizeof(int)))
878 return -EFAULT;
879
880 mfi->mode = MTD_FILE_MODE_NORMAL;
881
882 ret = otp_select_filemode(mfi, mode);
883
884 file->f_pos = 0;
885 break;
886 }
887
888 case OTPGETREGIONCOUNT:
889 case OTPGETREGIONINFO:
890 {
891 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
892 if (!buf)
893 return -ENOMEM;
894 switch (mfi->mode) {
895 case MTD_FILE_MODE_OTP_FACTORY:
896 ret = mtd_get_fact_prot_info(mtd, buf, 4096);
897 break;
898 case MTD_FILE_MODE_OTP_USER:
899 ret = mtd_get_user_prot_info(mtd, buf, 4096);
900 break;
901 default:
902 ret = -EINVAL;
903 break;
904 }
905 if (ret >= 0) {
906 if (cmd == OTPGETREGIONCOUNT) {
907 int nbr = ret / sizeof(struct otp_info);
908 ret = copy_to_user(argp, &nbr, sizeof(int));
909 } else
910 ret = copy_to_user(argp, buf, ret);
911 if (ret)
912 ret = -EFAULT;
913 }
914 kfree(buf);
915 break;
916 }
917
918 case OTPLOCK:
919 {
920 struct otp_info oinfo;
921
922 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
923 return -EINVAL;
924 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
925 return -EFAULT;
926 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
927 break;
928 }
929
930 /* This ioctl is being deprecated - it truncates the ECC layout */
931 case ECCGETLAYOUT:
932 {
933 struct nand_ecclayout_user *usrlay;
934
935 if (!mtd->ecclayout)
936 return -EOPNOTSUPP;
937
938 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
939 if (!usrlay)
940 return -ENOMEM;
941
942 shrink_ecclayout(mtd->ecclayout, usrlay);
943
944 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
945 ret = -EFAULT;
946 kfree(usrlay);
947 break;
948 }
949
950 case ECCGETSTATS:
951 {
952 if (copy_to_user(argp, &mtd->ecc_stats,
953 sizeof(struct mtd_ecc_stats)))
954 return -EFAULT;
955 break;
956 }
957
958 case MTDFILEMODE:
959 {
960 mfi->mode = 0;
961
962 switch(arg) {
963 case MTD_FILE_MODE_OTP_FACTORY:
964 case MTD_FILE_MODE_OTP_USER:
965 ret = otp_select_filemode(mfi, arg);
966 break;
967
968 case MTD_FILE_MODE_RAW:
969 if (!mtd_has_oob(mtd))
970 return -EOPNOTSUPP;
971 mfi->mode = arg;
972
973 case MTD_FILE_MODE_NORMAL:
974 break;
975 default:
976 ret = -EINVAL;
977 }
978 file->f_pos = 0;
979 break;
980 }
981
982 case BLKPG:
983 {
984 ret = mtdchar_blkpg_ioctl(mtd,
985 (struct blkpg_ioctl_arg __user *)arg);
986 break;
987 }
988
989 case BLKRRPART:
990 {
991 /* No reread partition feature. Just return ok */
992 ret = 0;
993 break;
994 }
995
996 default:
997 ret = -ENOTTY;
998 }
999
1000 return ret;
1001 } /* memory_ioctl */
1002
1003 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1004 {
1005 int ret;
1006
1007 mutex_lock(&mtd_mutex);
1008 ret = mtdchar_ioctl(file, cmd, arg);
1009 mutex_unlock(&mtd_mutex);
1010
1011 return ret;
1012 }
1013
1014 #ifdef CONFIG_COMPAT
1015
1016 struct mtd_oob_buf32 {
1017 u_int32_t start;
1018 u_int32_t length;
1019 compat_caddr_t ptr; /* unsigned char* */
1020 };
1021
1022 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1023 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1024
1025 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1026 unsigned long arg)
1027 {
1028 struct mtd_file_info *mfi = file->private_data;
1029 struct mtd_info *mtd = mfi->mtd;
1030 void __user *argp = compat_ptr(arg);
1031 int ret = 0;
1032
1033 mutex_lock(&mtd_mutex);
1034
1035 switch (cmd) {
1036 case MEMWRITEOOB32:
1037 {
1038 struct mtd_oob_buf32 buf;
1039 struct mtd_oob_buf32 __user *buf_user = argp;
1040
1041 if (copy_from_user(&buf, argp, sizeof(buf)))
1042 ret = -EFAULT;
1043 else
1044 ret = mtdchar_writeoob(file, mtd, buf.start,
1045 buf.length, compat_ptr(buf.ptr),
1046 &buf_user->length);
1047 break;
1048 }
1049
1050 case MEMREADOOB32:
1051 {
1052 struct mtd_oob_buf32 buf;
1053 struct mtd_oob_buf32 __user *buf_user = argp;
1054
1055 /* NOTE: writes return length to buf->start */
1056 if (copy_from_user(&buf, argp, sizeof(buf)))
1057 ret = -EFAULT;
1058 else
1059 ret = mtdchar_readoob(file, mtd, buf.start,
1060 buf.length, compat_ptr(buf.ptr),
1061 &buf_user->start);
1062 break;
1063 }
1064 default:
1065 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1066 }
1067
1068 mutex_unlock(&mtd_mutex);
1069
1070 return ret;
1071 }
1072
1073 #endif /* CONFIG_COMPAT */
1074
1075 /*
1076 * try to determine where a shared mapping can be made
1077 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1078 * mappings)
1079 */
1080 #ifndef CONFIG_MMU
1081 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1082 unsigned long addr,
1083 unsigned long len,
1084 unsigned long pgoff,
1085 unsigned long flags)
1086 {
1087 struct mtd_file_info *mfi = file->private_data;
1088 struct mtd_info *mtd = mfi->mtd;
1089 unsigned long offset;
1090 int ret;
1091
1092 if (addr != 0)
1093 return (unsigned long) -EINVAL;
1094
1095 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1096 return (unsigned long) -EINVAL;
1097
1098 offset = pgoff << PAGE_SHIFT;
1099 if (offset > mtd->size - len)
1100 return (unsigned long) -EINVAL;
1101
1102 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1103 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1104 }
1105 #endif
1106
1107 /*
1108 * set up a mapping for shared memory segments
1109 */
1110 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1111 {
1112 #ifdef CONFIG_MMU
1113 struct mtd_file_info *mfi = file->private_data;
1114 struct mtd_info *mtd = mfi->mtd;
1115 struct map_info *map = mtd->priv;
1116
1117 /* This is broken because it assumes the MTD device is map-based
1118 and that mtd->priv is a valid struct map_info. It should be
1119 replaced with something that uses the mtd_get_unmapped_area()
1120 operation properly. */
1121 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1122 #ifdef pgprot_noncached
1123 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1124 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1125 #endif
1126 return vm_iomap_memory(vma, map->phys, map->size);
1127 }
1128 return -ENODEV;
1129 #else
1130 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1131 #endif
1132 }
1133
1134 static const struct file_operations mtd_fops = {
1135 .owner = THIS_MODULE,
1136 .llseek = mtdchar_lseek,
1137 .read = mtdchar_read,
1138 .write = mtdchar_write,
1139 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1140 #ifdef CONFIG_COMPAT
1141 .compat_ioctl = mtdchar_compat_ioctl,
1142 #endif
1143 .open = mtdchar_open,
1144 .release = mtdchar_close,
1145 .mmap = mtdchar_mmap,
1146 #ifndef CONFIG_MMU
1147 .get_unmapped_area = mtdchar_get_unmapped_area,
1148 #endif
1149 };
1150
1151 static const struct super_operations mtd_ops = {
1152 .drop_inode = generic_delete_inode,
1153 .statfs = simple_statfs,
1154 };
1155
1156 static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1157 int flags, const char *dev_name, void *data)
1158 {
1159 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
1160 }
1161
1162 static struct file_system_type mtd_inodefs_type = {
1163 .name = "mtd_inodefs",
1164 .mount = mtd_inodefs_mount,
1165 .kill_sb = kill_anon_super,
1166 };
1167 MODULE_ALIAS_FS("mtd_inodefs");
1168
1169 int __init init_mtdchar(void)
1170 {
1171 int ret;
1172
1173 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1174 "mtd", &mtd_fops);
1175 if (ret < 0) {
1176 pr_err("Can't allocate major number %d for MTD\n",
1177 MTD_CHAR_MAJOR);
1178 return ret;
1179 }
1180
1181 ret = register_filesystem(&mtd_inodefs_type);
1182 if (ret) {
1183 pr_err("Can't register mtd_inodefs filesystem, error %d\n",
1184 ret);
1185 goto err_unregister_chdev;
1186 }
1187
1188 return ret;
1189
1190 err_unregister_chdev:
1191 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1192 return ret;
1193 }
1194
1195 void __exit cleanup_mtdchar(void)
1196 {
1197 unregister_filesystem(&mtd_inodefs_type);
1198 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1199 }
1200
1201 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linux with added FPC-III support