xref: /linux/drivers/mtd/mtdchar.c (revision 95db3b255fde4e830e5f8cc011eb404023f669d4)
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 	enum mtd_file_modes mode;
53 };
54 
55 static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
56 {
57 	struct mtd_file_info *mfi = file->private_data;
58 	return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
59 }
60 
61 static int mtdchar_open(struct inode *inode, struct file *file)
62 {
63 	int minor = iminor(inode);
64 	int devnum = minor >> 1;
65 	int ret = 0;
66 	struct mtd_info *mtd;
67 	struct mtd_file_info *mfi;
68 
69 	pr_debug("MTD_open\n");
70 
71 	/* You can't open the RO devices RW */
72 	if ((file->f_mode & FMODE_WRITE) && (minor & 1))
73 		return -EACCES;
74 
75 	mutex_lock(&mtd_mutex);
76 	mtd = get_mtd_device(NULL, devnum);
77 
78 	if (IS_ERR(mtd)) {
79 		ret = PTR_ERR(mtd);
80 		goto out;
81 	}
82 
83 	if (mtd->type == MTD_ABSENT) {
84 		ret = -ENODEV;
85 		goto out1;
86 	}
87 
88 	/* You can't open it RW if it's not a writeable device */
89 	if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
90 		ret = -EACCES;
91 		goto out1;
92 	}
93 
94 	mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
95 	if (!mfi) {
96 		ret = -ENOMEM;
97 		goto out1;
98 	}
99 	mfi->mtd = mtd;
100 	file->private_data = mfi;
101 	mutex_unlock(&mtd_mutex);
102 	return 0;
103 
104 out1:
105 	put_mtd_device(mtd);
106 out:
107 	mutex_unlock(&mtd_mutex);
108 	return ret;
109 } /* mtdchar_open */
110 
111 /*====================================================================*/
112 
113 static int mtdchar_close(struct inode *inode, struct file *file)
114 {
115 	struct mtd_file_info *mfi = file->private_data;
116 	struct mtd_info *mtd = mfi->mtd;
117 
118 	pr_debug("MTD_close\n");
119 
120 	/* Only sync if opened RW */
121 	if ((file->f_mode & FMODE_WRITE))
122 		mtd_sync(mtd);
123 
124 	put_mtd_device(mtd);
125 	file->private_data = NULL;
126 	kfree(mfi);
127 
128 	return 0;
129 } /* mtdchar_close */
130 
131 /* Back in June 2001, dwmw2 wrote:
132  *
133  *   FIXME: This _really_ needs to die. In 2.5, we should lock the
134  *   userspace buffer down and use it directly with readv/writev.
135  *
136  * The implementation below, using mtd_kmalloc_up_to, mitigates
137  * allocation failures when the system is under low-memory situations
138  * or if memory is highly fragmented at the cost of reducing the
139  * performance of the requested transfer due to a smaller buffer size.
140  *
141  * A more complex but more memory-efficient implementation based on
142  * get_user_pages and iovecs to cover extents of those pages is a
143  * longer-term goal, as intimated by dwmw2 above. However, for the
144  * write case, this requires yet more complex head and tail transfer
145  * handling when those head and tail offsets and sizes are such that
146  * alignment requirements are not met in the NAND subdriver.
147  */
148 
149 static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
150 			loff_t *ppos)
151 {
152 	struct mtd_file_info *mfi = file->private_data;
153 	struct mtd_info *mtd = mfi->mtd;
154 	size_t retlen;
155 	size_t total_retlen=0;
156 	int ret=0;
157 	int len;
158 	size_t size = count;
159 	char *kbuf;
160 
161 	pr_debug("MTD_read\n");
162 
163 	if (*ppos + count > mtd->size)
164 		count = mtd->size - *ppos;
165 
166 	if (!count)
167 		return 0;
168 
169 	kbuf = mtd_kmalloc_up_to(mtd, &size);
170 	if (!kbuf)
171 		return -ENOMEM;
172 
173 	while (count) {
174 		len = min_t(size_t, count, size);
175 
176 		switch (mfi->mode) {
177 		case MTD_FILE_MODE_OTP_FACTORY:
178 			ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
179 						     &retlen, kbuf);
180 			break;
181 		case MTD_FILE_MODE_OTP_USER:
182 			ret = mtd_read_user_prot_reg(mtd, *ppos, len,
183 						     &retlen, kbuf);
184 			break;
185 		case MTD_FILE_MODE_RAW:
186 		{
187 			struct mtd_oob_ops ops;
188 
189 			ops.mode = MTD_OPS_RAW;
190 			ops.datbuf = kbuf;
191 			ops.oobbuf = NULL;
192 			ops.len = len;
193 
194 			ret = mtd_read_oob(mtd, *ppos, &ops);
195 			retlen = ops.retlen;
196 			break;
197 		}
198 		default:
199 			ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
200 		}
201 		/* Nand returns -EBADMSG on ECC errors, but it returns
202 		 * the data. For our userspace tools it is important
203 		 * to dump areas with ECC errors!
204 		 * For kernel internal usage it also might return -EUCLEAN
205 		 * to signal the caller that a bitflip has occurred and has
206 		 * been corrected by the ECC algorithm.
207 		 * Userspace software which accesses NAND this way
208 		 * must be aware of the fact that it deals with NAND
209 		 */
210 		if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
211 			*ppos += retlen;
212 			if (copy_to_user(buf, kbuf, retlen)) {
213 				kfree(kbuf);
214 				return -EFAULT;
215 			}
216 			else
217 				total_retlen += retlen;
218 
219 			count -= retlen;
220 			buf += retlen;
221 			if (retlen == 0)
222 				count = 0;
223 		}
224 		else {
225 			kfree(kbuf);
226 			return ret;
227 		}
228 
229 	}
230 
231 	kfree(kbuf);
232 	return total_retlen;
233 } /* mtdchar_read */
234 
235 static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
236 			loff_t *ppos)
237 {
238 	struct mtd_file_info *mfi = file->private_data;
239 	struct mtd_info *mtd = mfi->mtd;
240 	size_t size = count;
241 	char *kbuf;
242 	size_t retlen;
243 	size_t total_retlen=0;
244 	int ret=0;
245 	int len;
246 
247 	pr_debug("MTD_write\n");
248 
249 	if (*ppos == mtd->size)
250 		return -ENOSPC;
251 
252 	if (*ppos + count > mtd->size)
253 		count = mtd->size - *ppos;
254 
255 	if (!count)
256 		return 0;
257 
258 	kbuf = mtd_kmalloc_up_to(mtd, &size);
259 	if (!kbuf)
260 		return -ENOMEM;
261 
262 	while (count) {
263 		len = min_t(size_t, count, size);
264 
265 		if (copy_from_user(kbuf, buf, len)) {
266 			kfree(kbuf);
267 			return -EFAULT;
268 		}
269 
270 		switch (mfi->mode) {
271 		case MTD_FILE_MODE_OTP_FACTORY:
272 			ret = -EROFS;
273 			break;
274 		case MTD_FILE_MODE_OTP_USER:
275 			ret = mtd_write_user_prot_reg(mtd, *ppos, len,
276 						      &retlen, kbuf);
277 			break;
278 
279 		case MTD_FILE_MODE_RAW:
280 		{
281 			struct mtd_oob_ops ops;
282 
283 			ops.mode = MTD_OPS_RAW;
284 			ops.datbuf = kbuf;
285 			ops.oobbuf = NULL;
286 			ops.ooboffs = 0;
287 			ops.len = len;
288 
289 			ret = mtd_write_oob(mtd, *ppos, &ops);
290 			retlen = ops.retlen;
291 			break;
292 		}
293 
294 		default:
295 			ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
296 		}
297 
298 		/*
299 		 * Return -ENOSPC only if no data could be written at all.
300 		 * Otherwise just return the number of bytes that actually
301 		 * have been written.
302 		 */
303 		if ((ret == -ENOSPC) && (total_retlen))
304 			break;
305 
306 		if (!ret) {
307 			*ppos += retlen;
308 			total_retlen += retlen;
309 			count -= retlen;
310 			buf += retlen;
311 		}
312 		else {
313 			kfree(kbuf);
314 			return ret;
315 		}
316 	}
317 
318 	kfree(kbuf);
319 	return total_retlen;
320 } /* mtdchar_write */
321 
322 /*======================================================================
323 
324     IOCTL calls for getting device parameters.
325 
326 ======================================================================*/
327 static void mtdchar_erase_callback (struct erase_info *instr)
328 {
329 	wake_up((wait_queue_head_t *)instr->priv);
330 }
331 
332 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
333 {
334 	struct mtd_info *mtd = mfi->mtd;
335 	size_t retlen;
336 
337 	switch (mode) {
338 	case MTD_OTP_FACTORY:
339 		if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
340 				-EOPNOTSUPP)
341 			return -EOPNOTSUPP;
342 
343 		mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
344 		break;
345 	case MTD_OTP_USER:
346 		if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
347 				-EOPNOTSUPP)
348 			return -EOPNOTSUPP;
349 
350 		mfi->mode = MTD_FILE_MODE_OTP_USER;
351 		break;
352 	case MTD_OTP_OFF:
353 		mfi->mode = MTD_FILE_MODE_NORMAL;
354 		break;
355 	default:
356 		return -EINVAL;
357 	}
358 
359 	return 0;
360 }
361 
362 static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
363 	uint64_t start, uint32_t length, void __user *ptr,
364 	uint32_t __user *retp)
365 {
366 	struct mtd_file_info *mfi = file->private_data;
367 	struct mtd_oob_ops ops;
368 	uint32_t retlen;
369 	int ret = 0;
370 
371 	if (!(file->f_mode & FMODE_WRITE))
372 		return -EPERM;
373 
374 	if (length > 4096)
375 		return -EINVAL;
376 
377 	if (!mtd->_write_oob)
378 		ret = -EOPNOTSUPP;
379 	else
380 		ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
381 
382 	if (ret)
383 		return ret;
384 
385 	ops.ooblen = length;
386 	ops.ooboffs = start & (mtd->writesize - 1);
387 	ops.datbuf = NULL;
388 	ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
389 		MTD_OPS_PLACE_OOB;
390 
391 	if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
392 		return -EINVAL;
393 
394 	ops.oobbuf = memdup_user(ptr, length);
395 	if (IS_ERR(ops.oobbuf))
396 		return PTR_ERR(ops.oobbuf);
397 
398 	start &= ~((uint64_t)mtd->writesize - 1);
399 	ret = mtd_write_oob(mtd, start, &ops);
400 
401 	if (ops.oobretlen > 0xFFFFFFFFU)
402 		ret = -EOVERFLOW;
403 	retlen = ops.oobretlen;
404 	if (copy_to_user(retp, &retlen, sizeof(length)))
405 		ret = -EFAULT;
406 
407 	kfree(ops.oobbuf);
408 	return ret;
409 }
410 
411 static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
412 	uint64_t start, uint32_t length, void __user *ptr,
413 	uint32_t __user *retp)
414 {
415 	struct mtd_file_info *mfi = file->private_data;
416 	struct mtd_oob_ops ops;
417 	int ret = 0;
418 
419 	if (length > 4096)
420 		return -EINVAL;
421 
422 	if (!access_ok(VERIFY_WRITE, ptr, length))
423 		return -EFAULT;
424 
425 	ops.ooblen = length;
426 	ops.ooboffs = start & (mtd->writesize - 1);
427 	ops.datbuf = NULL;
428 	ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
429 		MTD_OPS_PLACE_OOB;
430 
431 	if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
432 		return -EINVAL;
433 
434 	ops.oobbuf = kmalloc(length, GFP_KERNEL);
435 	if (!ops.oobbuf)
436 		return -ENOMEM;
437 
438 	start &= ~((uint64_t)mtd->writesize - 1);
439 	ret = mtd_read_oob(mtd, start, &ops);
440 
441 	if (put_user(ops.oobretlen, retp))
442 		ret = -EFAULT;
443 	else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
444 					    ops.oobretlen))
445 		ret = -EFAULT;
446 
447 	kfree(ops.oobbuf);
448 
449 	/*
450 	 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
451 	 * data. For our userspace tools it is important to dump areas
452 	 * with ECC errors!
453 	 * For kernel internal usage it also might return -EUCLEAN
454 	 * to signal the caller that a bitflip has occured and has
455 	 * been corrected by the ECC algorithm.
456 	 *
457 	 * Note: currently the standard NAND function, nand_read_oob_std,
458 	 * does not calculate ECC for the OOB area, so do not rely on
459 	 * this behavior unless you have replaced it with your own.
460 	 */
461 	if (mtd_is_bitflip_or_eccerr(ret))
462 		return 0;
463 
464 	return ret;
465 }
466 
467 /*
468  * Copies (and truncates, if necessary) OOB layout information to the
469  * deprecated layout struct, nand_ecclayout_user. This is necessary only to
470  * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
471  * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
472  * can describe any kind of OOB layout with almost zero overhead from a
473  * memory usage point of view).
474  */
475 static int shrink_ecclayout(struct mtd_info *mtd,
476 			    struct nand_ecclayout_user *to)
477 {
478 	struct mtd_oob_region oobregion;
479 	int i, section = 0, ret;
480 
481 	if (!mtd || !to)
482 		return -EINVAL;
483 
484 	memset(to, 0, sizeof(*to));
485 
486 	to->eccbytes = 0;
487 	for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
488 		u32 eccpos;
489 
490 		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
491 		if (ret < 0) {
492 			if (ret != -ERANGE)
493 				return ret;
494 
495 			break;
496 		}
497 
498 		eccpos = oobregion.offset;
499 		for (; i < MTD_MAX_ECCPOS_ENTRIES &&
500 		       eccpos < oobregion.offset + oobregion.length; i++) {
501 			to->eccpos[i] = eccpos++;
502 			to->eccbytes++;
503 		}
504 	}
505 
506 	for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
507 		ret = mtd_ooblayout_free(mtd, i, &oobregion);
508 		if (ret < 0) {
509 			if (ret != -ERANGE)
510 				return ret;
511 
512 			break;
513 		}
514 
515 		to->oobfree[i].offset = oobregion.offset;
516 		to->oobfree[i].length = oobregion.length;
517 		to->oobavail += to->oobfree[i].length;
518 	}
519 
520 	return 0;
521 }
522 
523 static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
524 {
525 	struct mtd_oob_region oobregion;
526 	int i, section = 0, ret;
527 
528 	if (!mtd || !to)
529 		return -EINVAL;
530 
531 	memset(to, 0, sizeof(*to));
532 
533 	to->eccbytes = 0;
534 	for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
535 		u32 eccpos;
536 
537 		ret = mtd_ooblayout_ecc(mtd, section, &oobregion);
538 		if (ret < 0) {
539 			if (ret != -ERANGE)
540 				return ret;
541 
542 			break;
543 		}
544 
545 		if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
546 			return -EINVAL;
547 
548 		eccpos = oobregion.offset;
549 		for (; eccpos < oobregion.offset + oobregion.length; i++) {
550 			to->eccpos[i] = eccpos++;
551 			to->eccbytes++;
552 		}
553 	}
554 
555 	for (i = 0; i < 8; i++) {
556 		ret = mtd_ooblayout_free(mtd, i, &oobregion);
557 		if (ret < 0) {
558 			if (ret != -ERANGE)
559 				return ret;
560 
561 			break;
562 		}
563 
564 		to->oobfree[i][0] = oobregion.offset;
565 		to->oobfree[i][1] = oobregion.length;
566 	}
567 
568 	to->useecc = MTD_NANDECC_AUTOPLACE;
569 
570 	return 0;
571 }
572 
573 static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
574 			       struct blkpg_ioctl_arg *arg)
575 {
576 	struct blkpg_partition p;
577 
578 	if (!capable(CAP_SYS_ADMIN))
579 		return -EPERM;
580 
581 	if (copy_from_user(&p, arg->data, sizeof(p)))
582 		return -EFAULT;
583 
584 	switch (arg->op) {
585 	case BLKPG_ADD_PARTITION:
586 
587 		/* Only master mtd device must be used to add partitions */
588 		if (mtd_is_partition(mtd))
589 			return -EINVAL;
590 
591 		/* Sanitize user input */
592 		p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
593 
594 		return mtd_add_partition(mtd, p.devname, p.start, p.length);
595 
596 	case BLKPG_DEL_PARTITION:
597 
598 		if (p.pno < 0)
599 			return -EINVAL;
600 
601 		return mtd_del_partition(mtd, p.pno);
602 
603 	default:
604 		return -EINVAL;
605 	}
606 }
607 
608 static int mtdchar_write_ioctl(struct mtd_info *mtd,
609 		struct mtd_write_req __user *argp)
610 {
611 	struct mtd_write_req req;
612 	struct mtd_oob_ops ops;
613 	const void __user *usr_data, *usr_oob;
614 	int ret;
615 
616 	if (copy_from_user(&req, argp, sizeof(req)))
617 		return -EFAULT;
618 
619 	usr_data = (const void __user *)(uintptr_t)req.usr_data;
620 	usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
621 	if (!access_ok(VERIFY_READ, usr_data, req.len) ||
622 	    !access_ok(VERIFY_READ, usr_oob, req.ooblen))
623 		return -EFAULT;
624 
625 	if (!mtd->_write_oob)
626 		return -EOPNOTSUPP;
627 
628 	ops.mode = req.mode;
629 	ops.len = (size_t)req.len;
630 	ops.ooblen = (size_t)req.ooblen;
631 	ops.ooboffs = 0;
632 
633 	if (usr_data) {
634 		ops.datbuf = memdup_user(usr_data, ops.len);
635 		if (IS_ERR(ops.datbuf))
636 			return PTR_ERR(ops.datbuf);
637 	} else {
638 		ops.datbuf = NULL;
639 	}
640 
641 	if (usr_oob) {
642 		ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
643 		if (IS_ERR(ops.oobbuf)) {
644 			kfree(ops.datbuf);
645 			return PTR_ERR(ops.oobbuf);
646 		}
647 	} else {
648 		ops.oobbuf = NULL;
649 	}
650 
651 	ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
652 
653 	kfree(ops.datbuf);
654 	kfree(ops.oobbuf);
655 
656 	return ret;
657 }
658 
659 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
660 {
661 	struct mtd_file_info *mfi = file->private_data;
662 	struct mtd_info *mtd = mfi->mtd;
663 	void __user *argp = (void __user *)arg;
664 	int ret = 0;
665 	u_long size;
666 	struct mtd_info_user info;
667 
668 	pr_debug("MTD_ioctl\n");
669 
670 	size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
671 	if (cmd & IOC_IN) {
672 		if (!access_ok(VERIFY_READ, argp, size))
673 			return -EFAULT;
674 	}
675 	if (cmd & IOC_OUT) {
676 		if (!access_ok(VERIFY_WRITE, argp, size))
677 			return -EFAULT;
678 	}
679 
680 	switch (cmd) {
681 	case MEMGETREGIONCOUNT:
682 		if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
683 			return -EFAULT;
684 		break;
685 
686 	case MEMGETREGIONINFO:
687 	{
688 		uint32_t ur_idx;
689 		struct mtd_erase_region_info *kr;
690 		struct region_info_user __user *ur = argp;
691 
692 		if (get_user(ur_idx, &(ur->regionindex)))
693 			return -EFAULT;
694 
695 		if (ur_idx >= mtd->numeraseregions)
696 			return -EINVAL;
697 
698 		kr = &(mtd->eraseregions[ur_idx]);
699 
700 		if (put_user(kr->offset, &(ur->offset))
701 		    || put_user(kr->erasesize, &(ur->erasesize))
702 		    || put_user(kr->numblocks, &(ur->numblocks)))
703 			return -EFAULT;
704 
705 		break;
706 	}
707 
708 	case MEMGETINFO:
709 		memset(&info, 0, sizeof(info));
710 		info.type	= mtd->type;
711 		info.flags	= mtd->flags;
712 		info.size	= mtd->size;
713 		info.erasesize	= mtd->erasesize;
714 		info.writesize	= mtd->writesize;
715 		info.oobsize	= mtd->oobsize;
716 		/* The below field is obsolete */
717 		info.padding	= 0;
718 		if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
719 			return -EFAULT;
720 		break;
721 
722 	case MEMERASE:
723 	case MEMERASE64:
724 	{
725 		struct erase_info *erase;
726 
727 		if(!(file->f_mode & FMODE_WRITE))
728 			return -EPERM;
729 
730 		erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
731 		if (!erase)
732 			ret = -ENOMEM;
733 		else {
734 			wait_queue_head_t waitq;
735 			DECLARE_WAITQUEUE(wait, current);
736 
737 			init_waitqueue_head(&waitq);
738 
739 			if (cmd == MEMERASE64) {
740 				struct erase_info_user64 einfo64;
741 
742 				if (copy_from_user(&einfo64, argp,
743 					    sizeof(struct erase_info_user64))) {
744 					kfree(erase);
745 					return -EFAULT;
746 				}
747 				erase->addr = einfo64.start;
748 				erase->len = einfo64.length;
749 			} else {
750 				struct erase_info_user einfo32;
751 
752 				if (copy_from_user(&einfo32, argp,
753 					    sizeof(struct erase_info_user))) {
754 					kfree(erase);
755 					return -EFAULT;
756 				}
757 				erase->addr = einfo32.start;
758 				erase->len = einfo32.length;
759 			}
760 			erase->mtd = mtd;
761 			erase->callback = mtdchar_erase_callback;
762 			erase->priv = (unsigned long)&waitq;
763 
764 			/*
765 			  FIXME: Allow INTERRUPTIBLE. Which means
766 			  not having the wait_queue head on the stack.
767 
768 			  If the wq_head is on the stack, and we
769 			  leave because we got interrupted, then the
770 			  wq_head is no longer there when the
771 			  callback routine tries to wake us up.
772 			*/
773 			ret = mtd_erase(mtd, erase);
774 			if (!ret) {
775 				set_current_state(TASK_UNINTERRUPTIBLE);
776 				add_wait_queue(&waitq, &wait);
777 				if (erase->state != MTD_ERASE_DONE &&
778 				    erase->state != MTD_ERASE_FAILED)
779 					schedule();
780 				remove_wait_queue(&waitq, &wait);
781 				set_current_state(TASK_RUNNING);
782 
783 				ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
784 			}
785 			kfree(erase);
786 		}
787 		break;
788 	}
789 
790 	case MEMWRITEOOB:
791 	{
792 		struct mtd_oob_buf buf;
793 		struct mtd_oob_buf __user *buf_user = argp;
794 
795 		/* NOTE: writes return length to buf_user->length */
796 		if (copy_from_user(&buf, argp, sizeof(buf)))
797 			ret = -EFAULT;
798 		else
799 			ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
800 				buf.ptr, &buf_user->length);
801 		break;
802 	}
803 
804 	case MEMREADOOB:
805 	{
806 		struct mtd_oob_buf buf;
807 		struct mtd_oob_buf __user *buf_user = argp;
808 
809 		/* NOTE: writes return length to buf_user->start */
810 		if (copy_from_user(&buf, argp, sizeof(buf)))
811 			ret = -EFAULT;
812 		else
813 			ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
814 				buf.ptr, &buf_user->start);
815 		break;
816 	}
817 
818 	case MEMWRITEOOB64:
819 	{
820 		struct mtd_oob_buf64 buf;
821 		struct mtd_oob_buf64 __user *buf_user = argp;
822 
823 		if (copy_from_user(&buf, argp, sizeof(buf)))
824 			ret = -EFAULT;
825 		else
826 			ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
827 				(void __user *)(uintptr_t)buf.usr_ptr,
828 				&buf_user->length);
829 		break;
830 	}
831 
832 	case MEMREADOOB64:
833 	{
834 		struct mtd_oob_buf64 buf;
835 		struct mtd_oob_buf64 __user *buf_user = argp;
836 
837 		if (copy_from_user(&buf, argp, sizeof(buf)))
838 			ret = -EFAULT;
839 		else
840 			ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
841 				(void __user *)(uintptr_t)buf.usr_ptr,
842 				&buf_user->length);
843 		break;
844 	}
845 
846 	case MEMWRITE:
847 	{
848 		ret = mtdchar_write_ioctl(mtd,
849 		      (struct mtd_write_req __user *)arg);
850 		break;
851 	}
852 
853 	case MEMLOCK:
854 	{
855 		struct erase_info_user einfo;
856 
857 		if (copy_from_user(&einfo, argp, sizeof(einfo)))
858 			return -EFAULT;
859 
860 		ret = mtd_lock(mtd, einfo.start, einfo.length);
861 		break;
862 	}
863 
864 	case MEMUNLOCK:
865 	{
866 		struct erase_info_user einfo;
867 
868 		if (copy_from_user(&einfo, argp, sizeof(einfo)))
869 			return -EFAULT;
870 
871 		ret = mtd_unlock(mtd, einfo.start, einfo.length);
872 		break;
873 	}
874 
875 	case MEMISLOCKED:
876 	{
877 		struct erase_info_user einfo;
878 
879 		if (copy_from_user(&einfo, argp, sizeof(einfo)))
880 			return -EFAULT;
881 
882 		ret = mtd_is_locked(mtd, einfo.start, einfo.length);
883 		break;
884 	}
885 
886 	/* Legacy interface */
887 	case MEMGETOOBSEL:
888 	{
889 		struct nand_oobinfo oi;
890 
891 		if (!mtd->ooblayout)
892 			return -EOPNOTSUPP;
893 
894 		ret = get_oobinfo(mtd, &oi);
895 		if (ret)
896 			return ret;
897 
898 		if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
899 			return -EFAULT;
900 		break;
901 	}
902 
903 	case MEMGETBADBLOCK:
904 	{
905 		loff_t offs;
906 
907 		if (copy_from_user(&offs, argp, sizeof(loff_t)))
908 			return -EFAULT;
909 		return mtd_block_isbad(mtd, offs);
910 		break;
911 	}
912 
913 	case MEMSETBADBLOCK:
914 	{
915 		loff_t offs;
916 
917 		if (copy_from_user(&offs, argp, sizeof(loff_t)))
918 			return -EFAULT;
919 		return mtd_block_markbad(mtd, offs);
920 		break;
921 	}
922 
923 	case OTPSELECT:
924 	{
925 		int mode;
926 		if (copy_from_user(&mode, argp, sizeof(int)))
927 			return -EFAULT;
928 
929 		mfi->mode = MTD_FILE_MODE_NORMAL;
930 
931 		ret = otp_select_filemode(mfi, mode);
932 
933 		file->f_pos = 0;
934 		break;
935 	}
936 
937 	case OTPGETREGIONCOUNT:
938 	case OTPGETREGIONINFO:
939 	{
940 		struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
941 		size_t retlen;
942 		if (!buf)
943 			return -ENOMEM;
944 		switch (mfi->mode) {
945 		case MTD_FILE_MODE_OTP_FACTORY:
946 			ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
947 			break;
948 		case MTD_FILE_MODE_OTP_USER:
949 			ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
950 			break;
951 		default:
952 			ret = -EINVAL;
953 			break;
954 		}
955 		if (!ret) {
956 			if (cmd == OTPGETREGIONCOUNT) {
957 				int nbr = retlen / sizeof(struct otp_info);
958 				ret = copy_to_user(argp, &nbr, sizeof(int));
959 			} else
960 				ret = copy_to_user(argp, buf, retlen);
961 			if (ret)
962 				ret = -EFAULT;
963 		}
964 		kfree(buf);
965 		break;
966 	}
967 
968 	case OTPLOCK:
969 	{
970 		struct otp_info oinfo;
971 
972 		if (mfi->mode != MTD_FILE_MODE_OTP_USER)
973 			return -EINVAL;
974 		if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
975 			return -EFAULT;
976 		ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
977 		break;
978 	}
979 
980 	/* This ioctl is being deprecated - it truncates the ECC layout */
981 	case ECCGETLAYOUT:
982 	{
983 		struct nand_ecclayout_user *usrlay;
984 
985 		if (!mtd->ooblayout)
986 			return -EOPNOTSUPP;
987 
988 		usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
989 		if (!usrlay)
990 			return -ENOMEM;
991 
992 		shrink_ecclayout(mtd, usrlay);
993 
994 		if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
995 			ret = -EFAULT;
996 		kfree(usrlay);
997 		break;
998 	}
999 
1000 	case ECCGETSTATS:
1001 	{
1002 		if (copy_to_user(argp, &mtd->ecc_stats,
1003 				 sizeof(struct mtd_ecc_stats)))
1004 			return -EFAULT;
1005 		break;
1006 	}
1007 
1008 	case MTDFILEMODE:
1009 	{
1010 		mfi->mode = 0;
1011 
1012 		switch(arg) {
1013 		case MTD_FILE_MODE_OTP_FACTORY:
1014 		case MTD_FILE_MODE_OTP_USER:
1015 			ret = otp_select_filemode(mfi, arg);
1016 			break;
1017 
1018 		case MTD_FILE_MODE_RAW:
1019 			if (!mtd_has_oob(mtd))
1020 				return -EOPNOTSUPP;
1021 			mfi->mode = arg;
1022 
1023 		case MTD_FILE_MODE_NORMAL:
1024 			break;
1025 		default:
1026 			ret = -EINVAL;
1027 		}
1028 		file->f_pos = 0;
1029 		break;
1030 	}
1031 
1032 	case BLKPG:
1033 	{
1034 		struct blkpg_ioctl_arg __user *blk_arg = argp;
1035 		struct blkpg_ioctl_arg a;
1036 
1037 		if (copy_from_user(&a, blk_arg, sizeof(a)))
1038 			ret = -EFAULT;
1039 		else
1040 			ret = mtdchar_blkpg_ioctl(mtd, &a);
1041 		break;
1042 	}
1043 
1044 	case BLKRRPART:
1045 	{
1046 		/* No reread partition feature. Just return ok */
1047 		ret = 0;
1048 		break;
1049 	}
1050 
1051 	default:
1052 		ret = -ENOTTY;
1053 	}
1054 
1055 	return ret;
1056 } /* memory_ioctl */
1057 
1058 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1059 {
1060 	int ret;
1061 
1062 	mutex_lock(&mtd_mutex);
1063 	ret = mtdchar_ioctl(file, cmd, arg);
1064 	mutex_unlock(&mtd_mutex);
1065 
1066 	return ret;
1067 }
1068 
1069 #ifdef CONFIG_COMPAT
1070 
1071 struct mtd_oob_buf32 {
1072 	u_int32_t start;
1073 	u_int32_t length;
1074 	compat_caddr_t ptr;	/* unsigned char* */
1075 };
1076 
1077 #define MEMWRITEOOB32		_IOWR('M', 3, struct mtd_oob_buf32)
1078 #define MEMREADOOB32		_IOWR('M', 4, struct mtd_oob_buf32)
1079 
1080 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1081 	unsigned long arg)
1082 {
1083 	struct mtd_file_info *mfi = file->private_data;
1084 	struct mtd_info *mtd = mfi->mtd;
1085 	void __user *argp = compat_ptr(arg);
1086 	int ret = 0;
1087 
1088 	mutex_lock(&mtd_mutex);
1089 
1090 	switch (cmd) {
1091 	case MEMWRITEOOB32:
1092 	{
1093 		struct mtd_oob_buf32 buf;
1094 		struct mtd_oob_buf32 __user *buf_user = argp;
1095 
1096 		if (copy_from_user(&buf, argp, sizeof(buf)))
1097 			ret = -EFAULT;
1098 		else
1099 			ret = mtdchar_writeoob(file, mtd, buf.start,
1100 				buf.length, compat_ptr(buf.ptr),
1101 				&buf_user->length);
1102 		break;
1103 	}
1104 
1105 	case MEMREADOOB32:
1106 	{
1107 		struct mtd_oob_buf32 buf;
1108 		struct mtd_oob_buf32 __user *buf_user = argp;
1109 
1110 		/* NOTE: writes return length to buf->start */
1111 		if (copy_from_user(&buf, argp, sizeof(buf)))
1112 			ret = -EFAULT;
1113 		else
1114 			ret = mtdchar_readoob(file, mtd, buf.start,
1115 				buf.length, compat_ptr(buf.ptr),
1116 				&buf_user->start);
1117 		break;
1118 	}
1119 
1120 	case BLKPG:
1121 	{
1122 		/* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1123 		struct blkpg_compat_ioctl_arg __user *uarg = argp;
1124 		struct blkpg_compat_ioctl_arg compat_arg;
1125 		struct blkpg_ioctl_arg a;
1126 
1127 		if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1128 			ret = -EFAULT;
1129 			break;
1130 		}
1131 
1132 		memset(&a, 0, sizeof(a));
1133 		a.op = compat_arg.op;
1134 		a.flags = compat_arg.flags;
1135 		a.datalen = compat_arg.datalen;
1136 		a.data = compat_ptr(compat_arg.data);
1137 
1138 		ret = mtdchar_blkpg_ioctl(mtd, &a);
1139 		break;
1140 	}
1141 
1142 	default:
1143 		ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1144 	}
1145 
1146 	mutex_unlock(&mtd_mutex);
1147 
1148 	return ret;
1149 }
1150 
1151 #endif /* CONFIG_COMPAT */
1152 
1153 /*
1154  * try to determine where a shared mapping can be made
1155  * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1156  *   mappings)
1157  */
1158 #ifndef CONFIG_MMU
1159 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1160 					   unsigned long addr,
1161 					   unsigned long len,
1162 					   unsigned long pgoff,
1163 					   unsigned long flags)
1164 {
1165 	struct mtd_file_info *mfi = file->private_data;
1166 	struct mtd_info *mtd = mfi->mtd;
1167 	unsigned long offset;
1168 	int ret;
1169 
1170 	if (addr != 0)
1171 		return (unsigned long) -EINVAL;
1172 
1173 	if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1174 		return (unsigned long) -EINVAL;
1175 
1176 	offset = pgoff << PAGE_SHIFT;
1177 	if (offset > mtd->size - len)
1178 		return (unsigned long) -EINVAL;
1179 
1180 	ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1181 	return ret == -EOPNOTSUPP ? -ENODEV : ret;
1182 }
1183 
1184 static unsigned mtdchar_mmap_capabilities(struct file *file)
1185 {
1186 	struct mtd_file_info *mfi = file->private_data;
1187 
1188 	return mtd_mmap_capabilities(mfi->mtd);
1189 }
1190 #endif
1191 
1192 /*
1193  * set up a mapping for shared memory segments
1194  */
1195 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1196 {
1197 #ifdef CONFIG_MMU
1198 	struct mtd_file_info *mfi = file->private_data;
1199 	struct mtd_info *mtd = mfi->mtd;
1200 	struct map_info *map = mtd->priv;
1201 
1202         /* This is broken because it assumes the MTD device is map-based
1203 	   and that mtd->priv is a valid struct map_info.  It should be
1204 	   replaced with something that uses the mtd_get_unmapped_area()
1205 	   operation properly. */
1206 	if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1207 #ifdef pgprot_noncached
1208 		if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1209 			vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1210 #endif
1211 		return vm_iomap_memory(vma, map->phys, map->size);
1212 	}
1213 	return -ENODEV;
1214 #else
1215 	return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1216 #endif
1217 }
1218 
1219 static const struct file_operations mtd_fops = {
1220 	.owner		= THIS_MODULE,
1221 	.llseek		= mtdchar_lseek,
1222 	.read		= mtdchar_read,
1223 	.write		= mtdchar_write,
1224 	.unlocked_ioctl	= mtdchar_unlocked_ioctl,
1225 #ifdef CONFIG_COMPAT
1226 	.compat_ioctl	= mtdchar_compat_ioctl,
1227 #endif
1228 	.open		= mtdchar_open,
1229 	.release	= mtdchar_close,
1230 	.mmap		= mtdchar_mmap,
1231 #ifndef CONFIG_MMU
1232 	.get_unmapped_area = mtdchar_get_unmapped_area,
1233 	.mmap_capabilities = mtdchar_mmap_capabilities,
1234 #endif
1235 };
1236 
1237 int __init init_mtdchar(void)
1238 {
1239 	int ret;
1240 
1241 	ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1242 				   "mtd", &mtd_fops);
1243 	if (ret < 0) {
1244 		pr_err("Can't allocate major number %d for MTD\n",
1245 		       MTD_CHAR_MAJOR);
1246 		return ret;
1247 	}
1248 
1249 	return ret;
1250 }
1251 
1252 void __exit cleanup_mtdchar(void)
1253 {
1254 	__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1255 }
1256 
1257 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
1258