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Lynx framebuffers multidomain implementation.
[linux/elbrus.git] / drivers / mtd / mtdchar.c
blob8f64373d441c6d1025f662915dade6ca180196c0
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 #ifdef __LCC__
567 !access_ok(VERIFY_READ, (void *)req.usr_data, req.len) ||
568 !access_ok(VERIFY_READ, (void *)req.usr_oob, req.ooblen))
569 #else
570 !access_ok(VERIFY_READ, req.usr_data, req.len) ||
571 !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
572 #endif
573 return -EFAULT;
574 if (!mtd->_write_oob)
575 return -EOPNOTSUPP;
576
577 ops.mode = req.mode;
578 ops.len = (size_t)req.len;
579 ops.ooblen = (size_t)req.ooblen;
580 ops.ooboffs = 0;
581
582 usr_data = (void __user *)(uintptr_t)req.usr_data;
583 usr_oob = (void __user *)(uintptr_t)req.usr_oob;
584
585 if (req.usr_data) {
586 ops.datbuf = memdup_user(usr_data, ops.len);
587 if (IS_ERR(ops.datbuf))
588 return PTR_ERR(ops.datbuf);
589 } else {
590 ops.datbuf = NULL;
591 }
592
593 if (req.usr_oob) {
594 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
595 if (IS_ERR(ops.oobbuf)) {
596 kfree(ops.datbuf);
597 return PTR_ERR(ops.oobbuf);
598 }
599 } else {
600 ops.oobbuf = NULL;
601 }
602
603 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
604
605 kfree(ops.datbuf);
606 kfree(ops.oobbuf);
607
608 return ret;
609 }
610
611 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
612 {
613 struct mtd_file_info *mfi = file->private_data;
614 struct mtd_info *mtd = mfi->mtd;
615 void __user *argp = (void __user *)arg;
616 int ret = 0;
617 u_long size;
618 struct mtd_info_user info;
619
620 pr_debug("MTD_ioctl\n");
621
622 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
623 if (cmd & IOC_IN) {
624 if (!access_ok(VERIFY_READ, argp, size))
625 return -EFAULT;
626 }
627 if (cmd & IOC_OUT) {
628 if (!access_ok(VERIFY_WRITE, argp, size))
629 return -EFAULT;
630 }
631
632 switch (cmd) {
633 case MEMGETREGIONCOUNT:
634 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
635 return -EFAULT;
636 break;
637
638 case MEMGETREGIONINFO:
639 {
640 uint32_t ur_idx;
641 struct mtd_erase_region_info *kr;
642 struct region_info_user __user *ur = argp;
643
644 if (get_user(ur_idx, &(ur->regionindex)))
645 return -EFAULT;
646
647 if (ur_idx >= mtd->numeraseregions)
648 return -EINVAL;
649
650 kr = &(mtd->eraseregions[ur_idx]);
651
652 if (put_user(kr->offset, &(ur->offset))
653 || put_user(kr->erasesize, &(ur->erasesize))
654 || put_user(kr->numblocks, &(ur->numblocks)))
655 return -EFAULT;
656
657 break;
658 }
659
660 case MEMGETINFO:
661 memset(&info, 0, sizeof(info));
662 info.type = mtd->type;
663 info.flags = mtd->flags;
664 info.size = mtd->size;
665 info.erasesize = mtd->erasesize;
666 info.writesize = mtd->writesize;
667 info.oobsize = mtd->oobsize;
668 /* The below field is obsolete */
669 info.padding = 0;
670 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
671 return -EFAULT;
672 break;
673
674 case MEMERASE:
675 case MEMERASE64:
676 {
677 struct erase_info *erase;
678
679 if(!(file->f_mode & FMODE_WRITE))
680 return -EPERM;
681
682 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
683 if (!erase)
684 ret = -ENOMEM;
685 else {
686 wait_queue_head_t waitq;
687 DECLARE_WAITQUEUE(wait, current);
688
689 init_waitqueue_head(&waitq);
690
691 if (cmd == MEMERASE64) {
692 struct erase_info_user64 einfo64;
693
694 if (copy_from_user(&einfo64, argp,
695 sizeof(struct erase_info_user64))) {
696 kfree(erase);
697 return -EFAULT;
698 }
699 erase->addr = einfo64.start;
700 erase->len = einfo64.length;
701 } else {
702 struct erase_info_user einfo32;
703
704 if (copy_from_user(&einfo32, argp,
705 sizeof(struct erase_info_user))) {
706 kfree(erase);
707 return -EFAULT;
708 }
709 erase->addr = einfo32.start;
710 erase->len = einfo32.length;
711 }
712 erase->mtd = mtd;
713 erase->callback = mtdchar_erase_callback;
714 erase->priv = (unsigned long)&waitq;
715
716 /*
717 FIXME: Allow INTERRUPTIBLE. Which means
718 not having the wait_queue head on the stack.
719
720 If the wq_head is on the stack, and we
721 leave because we got interrupted, then the
722 wq_head is no longer there when the
723 callback routine tries to wake us up.
724 */
725 ret = mtd_erase(mtd, erase);
726 if (!ret) {
727 set_current_state(TASK_UNINTERRUPTIBLE);
728 add_wait_queue(&waitq, &wait);
729 if (erase->state != MTD_ERASE_DONE &&
730 erase->state != MTD_ERASE_FAILED)
731 schedule();
732 remove_wait_queue(&waitq, &wait);
733 set_current_state(TASK_RUNNING);
734
735 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
736 }
737 kfree(erase);
738 }
739 break;
740 }
741
742 case MEMWRITEOOB:
743 {
744 struct mtd_oob_buf buf;
745 struct mtd_oob_buf __user *buf_user = argp;
746
747 /* NOTE: writes return length to buf_user->length */
748 if (copy_from_user(&buf, argp, sizeof(buf)))
749 ret = -EFAULT;
750 else
751 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
752 buf.ptr, &buf_user->length);
753 break;
754 }
755
756 case MEMREADOOB:
757 {
758 struct mtd_oob_buf buf;
759 struct mtd_oob_buf __user *buf_user = argp;
760
761 /* NOTE: writes return length to buf_user->start */
762 if (copy_from_user(&buf, argp, sizeof(buf)))
763 ret = -EFAULT;
764 else
765 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
766 buf.ptr, &buf_user->start);
767 break;
768 }
769
770 case MEMWRITEOOB64:
771 {
772 struct mtd_oob_buf64 buf;
773 struct mtd_oob_buf64 __user *buf_user = argp;
774
775 if (copy_from_user(&buf, argp, sizeof(buf)))
776 ret = -EFAULT;
777 else
778 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
779 (void __user *)(uintptr_t)buf.usr_ptr,
780 &buf_user->length);
781 break;
782 }
783
784 case MEMREADOOB64:
785 {
786 struct mtd_oob_buf64 buf;
787 struct mtd_oob_buf64 __user *buf_user = argp;
788
789 if (copy_from_user(&buf, argp, sizeof(buf)))
790 ret = -EFAULT;
791 else
792 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
793 (void __user *)(uintptr_t)buf.usr_ptr,
794 &buf_user->length);
795 break;
796 }
797
798 case MEMWRITE:
799 {
800 ret = mtdchar_write_ioctl(mtd,
801 (struct mtd_write_req __user *)arg);
802 break;
803 }
804
805 case MEMLOCK:
806 {
807 struct erase_info_user einfo;
808
809 if (copy_from_user(&einfo, argp, sizeof(einfo)))
810 return -EFAULT;
811
812 ret = mtd_lock(mtd, einfo.start, einfo.length);
813 break;
814 }
815
816 case MEMUNLOCK:
817 {
818 struct erase_info_user einfo;
819
820 if (copy_from_user(&einfo, argp, sizeof(einfo)))
821 return -EFAULT;
822
823 ret = mtd_unlock(mtd, einfo.start, einfo.length);
824 break;
825 }
826
827 case MEMISLOCKED:
828 {
829 struct erase_info_user einfo;
830
831 if (copy_from_user(&einfo, argp, sizeof(einfo)))
832 return -EFAULT;
833
834 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
835 break;
836 }
837
838 /* Legacy interface */
839 case MEMGETOOBSEL:
840 {
841 struct nand_oobinfo oi;
842
843 if (!mtd->ecclayout)
844 return -EOPNOTSUPP;
845 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
846 return -EINVAL;
847
848 oi.useecc = MTD_NANDECC_AUTOPLACE;
849 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
850 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
851 sizeof(oi.oobfree));
852 oi.eccbytes = mtd->ecclayout->eccbytes;
853
854 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
855 return -EFAULT;
856 break;
857 }
858
859 case MEMGETBADBLOCK:
860 {
861 loff_t offs;
862
863 if (copy_from_user(&offs, argp, sizeof(loff_t)))
864 return -EFAULT;
865 return mtd_block_isbad(mtd, offs);
866 break;
867 }
868
869 case MEMSETBADBLOCK:
870 {
871 loff_t offs;
872
873 if (copy_from_user(&offs, argp, sizeof(loff_t)))
874 return -EFAULT;
875 return mtd_block_markbad(mtd, offs);
876 break;
877 }
878
879 case OTPSELECT:
880 {
881 int mode;
882 if (copy_from_user(&mode, argp, sizeof(int)))
883 return -EFAULT;
884
885 mfi->mode = MTD_FILE_MODE_NORMAL;
886
887 ret = otp_select_filemode(mfi, mode);
888
889 file->f_pos = 0;
890 break;
891 }
892
893 case OTPGETREGIONCOUNT:
894 case OTPGETREGIONINFO:
895 {
896 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
897 if (!buf)
898 return -ENOMEM;
899 switch (mfi->mode) {
900 case MTD_FILE_MODE_OTP_FACTORY:
901 ret = mtd_get_fact_prot_info(mtd, buf, 4096);
902 break;
903 case MTD_FILE_MODE_OTP_USER:
904 ret = mtd_get_user_prot_info(mtd, buf, 4096);
905 break;
906 default:
907 ret = -EINVAL;
908 break;
909 }
910 if (ret >= 0) {
911 if (cmd == OTPGETREGIONCOUNT) {
912 int nbr = ret / sizeof(struct otp_info);
913 ret = copy_to_user(argp, &nbr, sizeof(int));
914 } else
915 ret = copy_to_user(argp, buf, ret);
916 if (ret)
917 ret = -EFAULT;
918 }
919 kfree(buf);
920 break;
921 }
922
923 case OTPLOCK:
924 {
925 struct otp_info oinfo;
926
927 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
928 return -EINVAL;
929 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
930 return -EFAULT;
931 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
932 break;
933 }
934
935 /* This ioctl is being deprecated - it truncates the ECC layout */
936 case ECCGETLAYOUT:
937 {
938 struct nand_ecclayout_user *usrlay;
939
940 if (!mtd->ecclayout)
941 return -EOPNOTSUPP;
942
943 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
944 if (!usrlay)
945 return -ENOMEM;
946
947 shrink_ecclayout(mtd->ecclayout, usrlay);
948
949 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
950 ret = -EFAULT;
951 kfree(usrlay);
952 break;
953 }
954
955 case ECCGETSTATS:
956 {
957 if (copy_to_user(argp, &mtd->ecc_stats,
958 sizeof(struct mtd_ecc_stats)))
959 return -EFAULT;
960 break;
961 }
962
963 case MTDFILEMODE:
964 {
965 mfi->mode = 0;
966
967 switch(arg) {
968 case MTD_FILE_MODE_OTP_FACTORY:
969 case MTD_FILE_MODE_OTP_USER:
970 ret = otp_select_filemode(mfi, arg);
971 break;
972
973 case MTD_FILE_MODE_RAW:
974 if (!mtd_has_oob(mtd))
975 return -EOPNOTSUPP;
976 mfi->mode = arg;
977
978 case MTD_FILE_MODE_NORMAL:
979 break;
980 default:
981 ret = -EINVAL;
982 }
983 file->f_pos = 0;
984 break;
985 }
986
987 case BLKPG:
988 {
989 ret = mtdchar_blkpg_ioctl(mtd,
990 (struct blkpg_ioctl_arg __user *)arg);
991 break;
992 }
993
994 case BLKRRPART:
995 {
996 /* No reread partition feature. Just return ok */
997 ret = 0;
998 break;
999 }
1000
1001 default:
1002 ret = -ENOTTY;
1003 }
1004
1005 return ret;
1006 } /* memory_ioctl */
1007
1008 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1009 {
1010 int ret;
1011
1012 mutex_lock(&mtd_mutex);
1013 ret = mtdchar_ioctl(file, cmd, arg);
1014 mutex_unlock(&mtd_mutex);
1015
1016 return ret;
1017 }
1018
1019 #ifdef CONFIG_COMPAT
1020
1021 struct mtd_oob_buf32 {
1022 u_int32_t start;
1023 u_int32_t length;
1024 compat_caddr_t ptr; /* unsigned char* */
1025 };
1026
1027 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1028 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1029
1030 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1031 unsigned long arg)
1032 {
1033 struct mtd_file_info *mfi = file->private_data;
1034 struct mtd_info *mtd = mfi->mtd;
1035 void __user *argp = compat_ptr(arg);
1036 int ret = 0;
1037
1038 mutex_lock(&mtd_mutex);
1039
1040 switch (cmd) {
1041 case MEMWRITEOOB32:
1042 {
1043 struct mtd_oob_buf32 buf;
1044 struct mtd_oob_buf32 __user *buf_user = argp;
1045
1046 if (copy_from_user(&buf, argp, sizeof(buf)))
1047 ret = -EFAULT;
1048 else
1049 ret = mtdchar_writeoob(file, mtd, buf.start,
1050 buf.length, compat_ptr(buf.ptr),
1051 &buf_user->length);
1052 break;
1053 }
1054
1055 case MEMREADOOB32:
1056 {
1057 struct mtd_oob_buf32 buf;
1058 struct mtd_oob_buf32 __user *buf_user = argp;
1059
1060 /* NOTE: writes return length to buf->start */
1061 if (copy_from_user(&buf, argp, sizeof(buf)))
1062 ret = -EFAULT;
1063 else
1064 ret = mtdchar_readoob(file, mtd, buf.start,
1065 buf.length, compat_ptr(buf.ptr),
1066 &buf_user->start);
1067 break;
1068 }
1069 default:
1070 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1071 }
1072
1073 mutex_unlock(&mtd_mutex);
1074
1075 return ret;
1076 }
1077
1078 #endif /* CONFIG_COMPAT */
1079
1080 /*
1081 * try to determine where a shared mapping can be made
1082 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1083 * mappings)
1084 */
1085 #ifndef CONFIG_MMU
1086 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1087 unsigned long addr,
1088 unsigned long len,
1089 unsigned long pgoff,
1090 unsigned long flags)
1091 {
1092 struct mtd_file_info *mfi = file->private_data;
1093 struct mtd_info *mtd = mfi->mtd;
1094 unsigned long offset;
1095 int ret;
1096
1097 if (addr != 0)
1098 return (unsigned long) -EINVAL;
1099
1100 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1101 return (unsigned long) -EINVAL;
1102
1103 offset = pgoff << PAGE_SHIFT;
1104 if (offset > mtd->size - len)
1105 return (unsigned long) -EINVAL;
1106
1107 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1108 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1109 }
1110 #endif
1111
1112 /*
1113 * set up a mapping for shared memory segments
1114 */
1115 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1116 {
1117 #ifdef CONFIG_MMU
1118 struct mtd_file_info *mfi = file->private_data;
1119 struct mtd_info *mtd = mfi->mtd;
1120 struct map_info *map = mtd->priv;
1121
1122 /* This is broken because it assumes the MTD device is map-based
1123 and that mtd->priv is a valid struct map_info. It should be
1124 replaced with something that uses the mtd_get_unmapped_area()
1125 operation properly. */
1126 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1127 #ifdef pgprot_noncached
1128 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1129 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1130 #endif
1131 return vm_iomap_memory(vma, map->phys, map->size);
1132 }
1133 return -ENODEV;
1134 #else
1135 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1136 #endif
1137 }
1138
1139 static const struct file_operations mtd_fops = {
1140 .owner = THIS_MODULE,
1141 .llseek = mtdchar_lseek,
1142 .read = mtdchar_read,
1143 .write = mtdchar_write,
1144 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1145 #ifdef CONFIG_COMPAT
1146 .compat_ioctl = mtdchar_compat_ioctl,
1147 #endif
1148 .open = mtdchar_open,
1149 .release = mtdchar_close,
1150 .mmap = mtdchar_mmap,
1151 #ifndef CONFIG_MMU
1152 .get_unmapped_area = mtdchar_get_unmapped_area,
1153 #endif
1154 };
1155
1156 static const struct super_operations mtd_ops = {
1157 .drop_inode = generic_delete_inode,
1158 .statfs = simple_statfs,
1159 };
1160
1161 static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1162 int flags, const char *dev_name, void *data)
1163 {
1164 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
1165 }
1166
1167 static struct file_system_type mtd_inodefs_type = {
1168 .name = "mtd_inodefs",
1169 .mount = mtd_inodefs_mount,
1170 .kill_sb = kill_anon_super,
1171 };
1172 MODULE_ALIAS_FS("mtd_inodefs");
1173
1174 int __init init_mtdchar(void)
1175 {
1176 int ret;
1177
1178 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1179 "mtd", &mtd_fops);
1180 if (ret < 0) {
1181 pr_err("Can't allocate major number %d for MTD\n",
1182 MTD_CHAR_MAJOR);
1183 return ret;
1184 }
1185
1186 ret = register_filesystem(&mtd_inodefs_type);
1187 if (ret) {
1188 pr_err("Can't register mtd_inodefs filesystem, error %d\n",
1189 ret);
1190 goto err_unregister_chdev;
1191 }
1192
1193 return ret;
1194
1195 err_unregister_chdev:
1196 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1197 return ret;
1198 }
1199
1200 void __exit cleanup_mtdchar(void)
1201 {
1202 unregister_filesystem(&mtd_inodefs_type);
1203 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1204 }
1205
1206 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linux for the MCST Elbrus 2000 architecture