Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
a1452a37 DW |
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 | |
1da177e4 LT |
17 | * |
18 | */ | |
19 | ||
15fdc52f TG |
20 | #include <linux/device.h> |
21 | #include <linux/fs.h> | |
0c1eafdb | 22 | #include <linux/mm.h> |
9c74034f | 23 | #include <linux/err.h> |
15fdc52f | 24 | #include <linux/init.h> |
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> | |
15fdc52f TG |
27 | #include <linux/slab.h> |
28 | #include <linux/sched.h> | |
5aa82940 | 29 | #include <linux/mutex.h> |
402d3265 | 30 | #include <linux/backing-dev.h> |
97718540 | 31 | #include <linux/compat.h> |
cd874237 | 32 | #include <linux/mount.h> |
d0f7959e | 33 | #include <linux/blkpg.h> |
1da177e4 | 34 | #include <linux/mtd/mtd.h> |
d0f7959e | 35 | #include <linux/mtd/partitions.h> |
dd02b67d | 36 | #include <linux/mtd/map.h> |
1da177e4 | 37 | |
15fdc52f | 38 | #include <asm/uaccess.h> |
9bc7b387 | 39 | |
cd874237 | 40 | #define MTD_INODE_FS_MAGIC 0x11307854 |
5aa82940 | 41 | static DEFINE_MUTEX(mtd_mutex); |
cd874237 | 42 | static struct vfsmount *mtd_inode_mnt __read_mostly; |
1da177e4 | 43 | |
045e9a5d | 44 | /* |
f1a28c02 TG |
45 | * Data structure to hold the pointer to the mtd device as well |
46 | * as mode information ofr various use cases. | |
045e9a5d | 47 | */ |
f1a28c02 TG |
48 | struct mtd_file_info { |
49 | struct mtd_info *mtd; | |
cd874237 | 50 | struct inode *ino; |
f1a28c02 TG |
51 | enum mtd_file_modes mode; |
52 | }; | |
31f4233b | 53 | |
1da177e4 LT |
54 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
55 | { | |
f1a28c02 TG |
56 | struct mtd_file_info *mfi = file->private_data; |
57 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
58 | |
59 | switch (orig) { | |
ea59830d | 60 | case SEEK_SET: |
1da177e4 | 61 | break; |
ea59830d | 62 | case SEEK_CUR: |
8b491d75 | 63 | offset += file->f_pos; |
1da177e4 | 64 | break; |
ea59830d | 65 | case SEEK_END: |
8b491d75 | 66 | offset += mtd->size; |
1da177e4 LT |
67 | break; |
68 | default: | |
69 | return -EINVAL; | |
70 | } | |
71 | ||
1887f517 | 72 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 73 | return file->f_pos = offset; |
1da177e4 | 74 | |
8b491d75 | 75 | return -EINVAL; |
1da177e4 LT |
76 | } |
77 | ||
78 | ||
79 | ||
80 | static int mtd_open(struct inode *inode, struct file *file) | |
81 | { | |
82 | int minor = iminor(inode); | |
83 | int devnum = minor >> 1; | |
6071239e | 84 | int ret = 0; |
1da177e4 | 85 | struct mtd_info *mtd; |
f1a28c02 | 86 | struct mtd_file_info *mfi; |
cd874237 | 87 | struct inode *mtd_ino; |
1da177e4 LT |
88 | |
89 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
90 | ||
1da177e4 | 91 | /* You can't open the RO devices RW */ |
aeb5d727 | 92 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
1da177e4 LT |
93 | return -EACCES; |
94 | ||
5aa82940 | 95 | mutex_lock(&mtd_mutex); |
1da177e4 | 96 | mtd = get_mtd_device(NULL, devnum); |
97894cda | 97 | |
6071239e JC |
98 | if (IS_ERR(mtd)) { |
99 | ret = PTR_ERR(mtd); | |
100 | goto out; | |
101 | } | |
97894cda | 102 | |
402d3265 | 103 | if (mtd->type == MTD_ABSENT) { |
1da177e4 | 104 | put_mtd_device(mtd); |
6071239e JC |
105 | ret = -ENODEV; |
106 | goto out; | |
1da177e4 LT |
107 | } |
108 | ||
cd874237 KS |
109 | mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum); |
110 | if (!mtd_ino) { | |
111 | put_mtd_device(mtd); | |
112 | ret = -ENOMEM; | |
113 | goto out; | |
114 | } | |
115 | if (mtd_ino->i_state & I_NEW) { | |
116 | mtd_ino->i_private = mtd; | |
117 | mtd_ino->i_mode = S_IFCHR; | |
118 | mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; | |
119 | unlock_new_inode(mtd_ino); | |
120 | } | |
121 | file->f_mapping = mtd_ino->i_mapping; | |
402d3265 | 122 | |
1da177e4 | 123 | /* You can't open it RW if it's not a writeable device */ |
aeb5d727 | 124 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
cd874237 | 125 | iput(mtd_ino); |
1da177e4 | 126 | put_mtd_device(mtd); |
6071239e JC |
127 | ret = -EACCES; |
128 | goto out; | |
1da177e4 | 129 | } |
97894cda | 130 | |
f1a28c02 TG |
131 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
132 | if (!mfi) { | |
cd874237 | 133 | iput(mtd_ino); |
f1a28c02 | 134 | put_mtd_device(mtd); |
6071239e JC |
135 | ret = -ENOMEM; |
136 | goto out; | |
f1a28c02 | 137 | } |
cd874237 | 138 | mfi->ino = mtd_ino; |
f1a28c02 TG |
139 | mfi->mtd = mtd; |
140 | file->private_data = mfi; | |
141 | ||
6071239e | 142 | out: |
5aa82940 | 143 | mutex_unlock(&mtd_mutex); |
6071239e | 144 | return ret; |
1da177e4 LT |
145 | } /* mtd_open */ |
146 | ||
147 | /*====================================================================*/ | |
148 | ||
149 | static int mtd_close(struct inode *inode, struct file *file) | |
150 | { | |
f1a28c02 TG |
151 | struct mtd_file_info *mfi = file->private_data; |
152 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
153 | |
154 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
155 | ||
7eafaed5 | 156 | /* Only sync if opened RW */ |
aeb5d727 | 157 | if ((file->f_mode & FMODE_WRITE) && mtd->sync) |
1da177e4 | 158 | mtd->sync(mtd); |
97894cda | 159 | |
cd874237 KS |
160 | iput(mfi->ino); |
161 | ||
1da177e4 | 162 | put_mtd_device(mtd); |
f1a28c02 TG |
163 | file->private_data = NULL; |
164 | kfree(mfi); | |
1da177e4 LT |
165 | |
166 | return 0; | |
167 | } /* mtd_close */ | |
168 | ||
3e45cf5e GE |
169 | /* Back in June 2001, dwmw2 wrote: |
170 | * | |
171 | * FIXME: This _really_ needs to die. In 2.5, we should lock the | |
172 | * userspace buffer down and use it directly with readv/writev. | |
173 | * | |
174 | * The implementation below, using mtd_kmalloc_up_to, mitigates | |
175 | * allocation failures when the system is under low-memory situations | |
176 | * or if memory is highly fragmented at the cost of reducing the | |
177 | * performance of the requested transfer due to a smaller buffer size. | |
178 | * | |
179 | * A more complex but more memory-efficient implementation based on | |
180 | * get_user_pages and iovecs to cover extents of those pages is a | |
181 | * longer-term goal, as intimated by dwmw2 above. However, for the | |
182 | * write case, this requires yet more complex head and tail transfer | |
183 | * handling when those head and tail offsets and sizes are such that | |
184 | * alignment requirements are not met in the NAND subdriver. | |
185 | */ | |
1da177e4 LT |
186 | |
187 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
188 | { | |
f1a28c02 TG |
189 | struct mtd_file_info *mfi = file->private_data; |
190 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
191 | size_t retlen=0; |
192 | size_t total_retlen=0; | |
193 | int ret=0; | |
194 | int len; | |
3e45cf5e | 195 | size_t size = count; |
1da177e4 | 196 | char *kbuf; |
97894cda | 197 | |
1da177e4 LT |
198 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
199 | ||
200 | if (*ppos + count > mtd->size) | |
201 | count = mtd->size - *ppos; | |
202 | ||
203 | if (!count) | |
204 | return 0; | |
97894cda | 205 | |
3e45cf5e | 206 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
207 | if (!kbuf) |
208 | return -ENOMEM; | |
209 | ||
1da177e4 | 210 | while (count) { |
3e45cf5e | 211 | len = min_t(size_t, count, size); |
1da177e4 | 212 | |
f1a28c02 TG |
213 | switch (mfi->mode) { |
214 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
215 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
216 | break; | |
217 | case MTD_MODE_OTP_USER: | |
218 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
219 | break; | |
f1a28c02 TG |
220 | case MTD_MODE_RAW: |
221 | { | |
222 | struct mtd_oob_ops ops; | |
223 | ||
224 | ops.mode = MTD_OOB_RAW; | |
225 | ops.datbuf = kbuf; | |
226 | ops.oobbuf = NULL; | |
227 | ops.len = len; | |
228 | ||
229 | ret = mtd->read_oob(mtd, *ppos, &ops); | |
230 | retlen = ops.retlen; | |
231 | break; | |
232 | } | |
31f4233b | 233 | default: |
f4a43cfc | 234 | ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 235 | } |
1da177e4 LT |
236 | /* Nand returns -EBADMSG on ecc errors, but it returns |
237 | * the data. For our userspace tools it is important | |
97894cda | 238 | * to dump areas with ecc errors ! |
9a1fcdfd | 239 | * For kernel internal usage it also might return -EUCLEAN |
25985edc | 240 | * to signal the caller that a bitflip has occurred and has |
9a1fcdfd | 241 | * been corrected by the ECC algorithm. |
1da177e4 LT |
242 | * Userspace software which accesses NAND this way |
243 | * must be aware of the fact that it deals with NAND | |
244 | */ | |
9a1fcdfd | 245 | if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { |
1da177e4 LT |
246 | *ppos += retlen; |
247 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 248 | kfree(kbuf); |
1da177e4 LT |
249 | return -EFAULT; |
250 | } | |
251 | else | |
252 | total_retlen += retlen; | |
253 | ||
254 | count -= retlen; | |
255 | buf += retlen; | |
31f4233b NP |
256 | if (retlen == 0) |
257 | count = 0; | |
1da177e4 LT |
258 | } |
259 | else { | |
260 | kfree(kbuf); | |
261 | return ret; | |
262 | } | |
97894cda | 263 | |
1da177e4 LT |
264 | } |
265 | ||
b802c074 | 266 | kfree(kbuf); |
1da177e4 LT |
267 | return total_retlen; |
268 | } /* mtd_read */ | |
269 | ||
270 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
271 | { | |
f1a28c02 TG |
272 | struct mtd_file_info *mfi = file->private_data; |
273 | struct mtd_info *mtd = mfi->mtd; | |
3e45cf5e | 274 | size_t size = count; |
1da177e4 LT |
275 | char *kbuf; |
276 | size_t retlen; | |
277 | size_t total_retlen=0; | |
278 | int ret=0; | |
279 | int len; | |
280 | ||
281 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 282 | |
1da177e4 LT |
283 | if (*ppos == mtd->size) |
284 | return -ENOSPC; | |
97894cda | 285 | |
1da177e4 LT |
286 | if (*ppos + count > mtd->size) |
287 | count = mtd->size - *ppos; | |
288 | ||
289 | if (!count) | |
290 | return 0; | |
291 | ||
3e45cf5e | 292 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
293 | if (!kbuf) |
294 | return -ENOMEM; | |
295 | ||
1da177e4 | 296 | while (count) { |
3e45cf5e | 297 | len = min_t(size_t, count, size); |
1da177e4 | 298 | |
1da177e4 LT |
299 | if (copy_from_user(kbuf, buf, len)) { |
300 | kfree(kbuf); | |
301 | return -EFAULT; | |
302 | } | |
97894cda | 303 | |
f1a28c02 TG |
304 | switch (mfi->mode) { |
305 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
306 | ret = -EROFS; |
307 | break; | |
308 | case MTD_MODE_OTP_USER: | |
309 | if (!mtd->write_user_prot_reg) { | |
310 | ret = -EOPNOTSUPP; | |
311 | break; | |
312 | } | |
313 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
314 | break; | |
f1a28c02 TG |
315 | |
316 | case MTD_MODE_RAW: | |
317 | { | |
318 | struct mtd_oob_ops ops; | |
319 | ||
320 | ops.mode = MTD_OOB_RAW; | |
321 | ops.datbuf = kbuf; | |
322 | ops.oobbuf = NULL; | |
bf514081 | 323 | ops.ooboffs = 0; |
f1a28c02 TG |
324 | ops.len = len; |
325 | ||
326 | ret = mtd->write_oob(mtd, *ppos, &ops); | |
327 | retlen = ops.retlen; | |
328 | break; | |
329 | } | |
330 | ||
31f4233b NP |
331 | default: |
332 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
333 | } | |
1da177e4 LT |
334 | if (!ret) { |
335 | *ppos += retlen; | |
336 | total_retlen += retlen; | |
337 | count -= retlen; | |
338 | buf += retlen; | |
339 | } | |
340 | else { | |
341 | kfree(kbuf); | |
342 | return ret; | |
343 | } | |
1da177e4 LT |
344 | } |
345 | ||
b802c074 | 346 | kfree(kbuf); |
1da177e4 LT |
347 | return total_retlen; |
348 | } /* mtd_write */ | |
349 | ||
350 | /*====================================================================== | |
351 | ||
352 | IOCTL calls for getting device parameters. | |
353 | ||
354 | ======================================================================*/ | |
355 | static void mtdchar_erase_callback (struct erase_info *instr) | |
356 | { | |
357 | wake_up((wait_queue_head_t *)instr->priv); | |
358 | } | |
359 | ||
34a82443 | 360 | #ifdef CONFIG_HAVE_MTD_OTP |
f1a28c02 TG |
361 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
362 | { | |
363 | struct mtd_info *mtd = mfi->mtd; | |
364 | int ret = 0; | |
365 | ||
366 | switch (mode) { | |
367 | case MTD_OTP_FACTORY: | |
368 | if (!mtd->read_fact_prot_reg) | |
369 | ret = -EOPNOTSUPP; | |
370 | else | |
371 | mfi->mode = MTD_MODE_OTP_FACTORY; | |
372 | break; | |
373 | case MTD_OTP_USER: | |
374 | if (!mtd->read_fact_prot_reg) | |
375 | ret = -EOPNOTSUPP; | |
376 | else | |
377 | mfi->mode = MTD_MODE_OTP_USER; | |
378 | break; | |
379 | default: | |
380 | ret = -EINVAL; | |
381 | case MTD_OTP_OFF: | |
382 | break; | |
383 | } | |
384 | return ret; | |
385 | } | |
386 | #else | |
387 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
388 | #endif | |
389 | ||
97718540 KC |
390 | static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd, |
391 | uint64_t start, uint32_t length, void __user *ptr, | |
392 | uint32_t __user *retp) | |
393 | { | |
394 | struct mtd_oob_ops ops; | |
395 | uint32_t retlen; | |
396 | int ret = 0; | |
397 | ||
398 | if (!(file->f_mode & FMODE_WRITE)) | |
399 | return -EPERM; | |
400 | ||
401 | if (length > 4096) | |
402 | return -EINVAL; | |
403 | ||
404 | if (!mtd->write_oob) | |
405 | ret = -EOPNOTSUPP; | |
406 | else | |
0040476b | 407 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; |
97718540 KC |
408 | |
409 | if (ret) | |
410 | return ret; | |
411 | ||
412 | ops.ooblen = length; | |
413 | ops.ooboffs = start & (mtd->oobsize - 1); | |
414 | ops.datbuf = NULL; | |
415 | ops.mode = MTD_OOB_PLACE; | |
416 | ||
417 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
418 | return -EINVAL; | |
419 | ||
df1f1d1c JL |
420 | ops.oobbuf = memdup_user(ptr, length); |
421 | if (IS_ERR(ops.oobbuf)) | |
422 | return PTR_ERR(ops.oobbuf); | |
97718540 KC |
423 | |
424 | start &= ~((uint64_t)mtd->oobsize - 1); | |
425 | ret = mtd->write_oob(mtd, start, &ops); | |
426 | ||
427 | if (ops.oobretlen > 0xFFFFFFFFU) | |
428 | ret = -EOVERFLOW; | |
429 | retlen = ops.oobretlen; | |
430 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
431 | ret = -EFAULT; | |
432 | ||
433 | kfree(ops.oobbuf); | |
434 | return ret; | |
435 | } | |
436 | ||
437 | static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start, | |
438 | uint32_t length, void __user *ptr, uint32_t __user *retp) | |
439 | { | |
440 | struct mtd_oob_ops ops; | |
441 | int ret = 0; | |
442 | ||
443 | if (length > 4096) | |
444 | return -EINVAL; | |
445 | ||
446 | if (!mtd->read_oob) | |
447 | ret = -EOPNOTSUPP; | |
448 | else | |
449 | ret = access_ok(VERIFY_WRITE, ptr, | |
450 | length) ? 0 : -EFAULT; | |
451 | if (ret) | |
452 | return ret; | |
453 | ||
454 | ops.ooblen = length; | |
455 | ops.ooboffs = start & (mtd->oobsize - 1); | |
456 | ops.datbuf = NULL; | |
457 | ops.mode = MTD_OOB_PLACE; | |
458 | ||
459 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
460 | return -EINVAL; | |
461 | ||
462 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
463 | if (!ops.oobbuf) | |
464 | return -ENOMEM; | |
465 | ||
466 | start &= ~((uint64_t)mtd->oobsize - 1); | |
467 | ret = mtd->read_oob(mtd, start, &ops); | |
468 | ||
469 | if (put_user(ops.oobretlen, retp)) | |
470 | ret = -EFAULT; | |
471 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
472 | ops.oobretlen)) | |
473 | ret = -EFAULT; | |
474 | ||
475 | kfree(ops.oobbuf); | |
476 | return ret; | |
477 | } | |
478 | ||
cc26c3cd BN |
479 | /* |
480 | * Copies (and truncates, if necessary) data from the larger struct, | |
481 | * nand_ecclayout, to the smaller, deprecated layout struct, | |
482 | * nand_ecclayout_user. This is necessary only to suppport the deprecated | |
483 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use | |
484 | * nand_ecclayout flexibly (i.e. the struct may change size in new | |
485 | * releases without requiring major rewrites). | |
486 | */ | |
487 | static int shrink_ecclayout(const struct nand_ecclayout *from, | |
488 | struct nand_ecclayout_user *to) | |
489 | { | |
490 | int i; | |
491 | ||
492 | if (!from || !to) | |
493 | return -EINVAL; | |
494 | ||
495 | memset(to, 0, sizeof(*to)); | |
496 | ||
0ceacf36 | 497 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
cc26c3cd BN |
498 | for (i = 0; i < to->eccbytes; i++) |
499 | to->eccpos[i] = from->eccpos[i]; | |
500 | ||
501 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
502 | if (from->oobfree[i].length == 0 && | |
503 | from->oobfree[i].offset == 0) | |
504 | break; | |
505 | to->oobavail += from->oobfree[i].length; | |
506 | to->oobfree[i] = from->oobfree[i]; | |
507 | } | |
508 | ||
509 | return 0; | |
510 | } | |
511 | ||
d0f7959e RT |
512 | static int mtd_blkpg_ioctl(struct mtd_info *mtd, |
513 | struct blkpg_ioctl_arg __user *arg) | |
514 | { | |
515 | struct blkpg_ioctl_arg a; | |
516 | struct blkpg_partition p; | |
517 | ||
518 | if (!capable(CAP_SYS_ADMIN)) | |
519 | return -EPERM; | |
520 | ||
d0f7959e RT |
521 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
522 | return -EFAULT; | |
523 | ||
524 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
525 | return -EFAULT; | |
526 | ||
527 | switch (a.op) { | |
528 | case BLKPG_ADD_PARTITION: | |
529 | ||
a7e93dcd RT |
530 | /* Only master mtd device must be used to add partitions */ |
531 | if (mtd_is_partition(mtd)) | |
532 | return -EINVAL; | |
533 | ||
d0f7959e RT |
534 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
535 | ||
536 | case BLKPG_DEL_PARTITION: | |
537 | ||
538 | if (p.pno < 0) | |
539 | return -EINVAL; | |
540 | ||
541 | return mtd_del_partition(mtd, p.pno); | |
542 | ||
543 | default: | |
544 | return -EINVAL; | |
545 | } | |
546 | } | |
d0f7959e | 547 | |
55929332 | 548 | static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 549 | { |
f1a28c02 TG |
550 | struct mtd_file_info *mfi = file->private_data; |
551 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
552 | void __user *argp = (void __user *)arg; |
553 | int ret = 0; | |
554 | u_long size; | |
73c619ea | 555 | struct mtd_info_user info; |
97894cda | 556 | |
1da177e4 LT |
557 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
558 | ||
559 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
560 | if (cmd & IOC_IN) { | |
561 | if (!access_ok(VERIFY_READ, argp, size)) | |
562 | return -EFAULT; | |
563 | } | |
564 | if (cmd & IOC_OUT) { | |
565 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
566 | return -EFAULT; | |
567 | } | |
97894cda | 568 | |
1da177e4 LT |
569 | switch (cmd) { |
570 | case MEMGETREGIONCOUNT: | |
571 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
572 | return -EFAULT; | |
573 | break; | |
574 | ||
575 | case MEMGETREGIONINFO: | |
576 | { | |
b67c5f87 ZW |
577 | uint32_t ur_idx; |
578 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 579 | struct region_info_user __user *ur = argp; |
1da177e4 | 580 | |
b67c5f87 | 581 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
582 | return -EFAULT; |
583 | ||
5e59be1f DC |
584 | if (ur_idx >= mtd->numeraseregions) |
585 | return -EINVAL; | |
586 | ||
b67c5f87 ZW |
587 | kr = &(mtd->eraseregions[ur_idx]); |
588 | ||
589 | if (put_user(kr->offset, &(ur->offset)) | |
590 | || put_user(kr->erasesize, &(ur->erasesize)) | |
591 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 592 | return -EFAULT; |
b67c5f87 | 593 | |
1da177e4 LT |
594 | break; |
595 | } | |
596 | ||
597 | case MEMGETINFO: | |
a0c5a394 | 598 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
599 | info.type = mtd->type; |
600 | info.flags = mtd->flags; | |
601 | info.size = mtd->size; | |
602 | info.erasesize = mtd->erasesize; | |
603 | info.writesize = mtd->writesize; | |
604 | info.oobsize = mtd->oobsize; | |
64f60710 AB |
605 | /* The below fields are obsolete */ |
606 | info.ecctype = -1; | |
73c619ea | 607 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
608 | return -EFAULT; |
609 | break; | |
610 | ||
611 | case MEMERASE: | |
0dc54e9f | 612 | case MEMERASE64: |
1da177e4 LT |
613 | { |
614 | struct erase_info *erase; | |
615 | ||
aeb5d727 | 616 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
617 | return -EPERM; |
618 | ||
95b93a0c | 619 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
620 | if (!erase) |
621 | ret = -ENOMEM; | |
622 | else { | |
623 | wait_queue_head_t waitq; | |
624 | DECLARE_WAITQUEUE(wait, current); | |
625 | ||
626 | init_waitqueue_head(&waitq); | |
627 | ||
0dc54e9f KC |
628 | if (cmd == MEMERASE64) { |
629 | struct erase_info_user64 einfo64; | |
630 | ||
631 | if (copy_from_user(&einfo64, argp, | |
632 | sizeof(struct erase_info_user64))) { | |
633 | kfree(erase); | |
634 | return -EFAULT; | |
635 | } | |
636 | erase->addr = einfo64.start; | |
637 | erase->len = einfo64.length; | |
638 | } else { | |
639 | struct erase_info_user einfo32; | |
640 | ||
641 | if (copy_from_user(&einfo32, argp, | |
642 | sizeof(struct erase_info_user))) { | |
643 | kfree(erase); | |
644 | return -EFAULT; | |
645 | } | |
646 | erase->addr = einfo32.start; | |
647 | erase->len = einfo32.length; | |
1da177e4 LT |
648 | } |
649 | erase->mtd = mtd; | |
650 | erase->callback = mtdchar_erase_callback; | |
651 | erase->priv = (unsigned long)&waitq; | |
97894cda | 652 | |
1da177e4 LT |
653 | /* |
654 | FIXME: Allow INTERRUPTIBLE. Which means | |
655 | not having the wait_queue head on the stack. | |
97894cda | 656 | |
1da177e4 LT |
657 | If the wq_head is on the stack, and we |
658 | leave because we got interrupted, then the | |
659 | wq_head is no longer there when the | |
660 | callback routine tries to wake us up. | |
661 | */ | |
662 | ret = mtd->erase(mtd, erase); | |
663 | if (!ret) { | |
664 | set_current_state(TASK_UNINTERRUPTIBLE); | |
665 | add_wait_queue(&waitq, &wait); | |
666 | if (erase->state != MTD_ERASE_DONE && | |
667 | erase->state != MTD_ERASE_FAILED) | |
668 | schedule(); | |
669 | remove_wait_queue(&waitq, &wait); | |
670 | set_current_state(TASK_RUNNING); | |
671 | ||
672 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
673 | } | |
674 | kfree(erase); | |
675 | } | |
676 | break; | |
677 | } | |
678 | ||
679 | case MEMWRITEOOB: | |
680 | { | |
681 | struct mtd_oob_buf buf; | |
97718540 | 682 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 683 | |
97718540 KC |
684 | /* NOTE: writes return length to buf_user->length */ |
685 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 686 | ret = -EFAULT; |
97718540 KC |
687 | else |
688 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
689 | buf.ptr, &buf_user->length); | |
1da177e4 | 690 | break; |
1da177e4 LT |
691 | } |
692 | ||
693 | case MEMREADOOB: | |
694 | { | |
695 | struct mtd_oob_buf buf; | |
97718540 | 696 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 697 | |
97718540 KC |
698 | /* NOTE: writes return length to buf_user->start */ |
699 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 700 | ret = -EFAULT; |
97718540 KC |
701 | else |
702 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
703 | buf.ptr, &buf_user->start); | |
1da177e4 LT |
704 | break; |
705 | } | |
706 | ||
aea7cea9 KC |
707 | case MEMWRITEOOB64: |
708 | { | |
709 | struct mtd_oob_buf64 buf; | |
710 | struct mtd_oob_buf64 __user *buf_user = argp; | |
711 | ||
712 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
713 | ret = -EFAULT; | |
714 | else | |
715 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
716 | (void __user *)(uintptr_t)buf.usr_ptr, | |
717 | &buf_user->length); | |
718 | break; | |
719 | } | |
720 | ||
721 | case MEMREADOOB64: | |
722 | { | |
723 | struct mtd_oob_buf64 buf; | |
724 | struct mtd_oob_buf64 __user *buf_user = argp; | |
725 | ||
726 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
727 | ret = -EFAULT; | |
728 | else | |
729 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
730 | (void __user *)(uintptr_t)buf.usr_ptr, | |
731 | &buf_user->length); | |
732 | break; | |
733 | } | |
734 | ||
1da177e4 LT |
735 | case MEMLOCK: |
736 | { | |
175428b2 | 737 | struct erase_info_user einfo; |
1da177e4 | 738 | |
175428b2 | 739 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
740 | return -EFAULT; |
741 | ||
742 | if (!mtd->lock) | |
743 | ret = -EOPNOTSUPP; | |
744 | else | |
175428b2 | 745 | ret = mtd->lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
746 | break; |
747 | } | |
748 | ||
749 | case MEMUNLOCK: | |
750 | { | |
175428b2 | 751 | struct erase_info_user einfo; |
1da177e4 | 752 | |
175428b2 | 753 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
754 | return -EFAULT; |
755 | ||
756 | if (!mtd->unlock) | |
757 | ret = -EOPNOTSUPP; | |
758 | else | |
175428b2 | 759 | ret = mtd->unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
760 | break; |
761 | } | |
762 | ||
9938424f RC |
763 | case MEMISLOCKED: |
764 | { | |
765 | struct erase_info_user einfo; | |
766 | ||
767 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
768 | return -EFAULT; | |
769 | ||
770 | if (!mtd->is_locked) | |
771 | ret = -EOPNOTSUPP; | |
772 | else | |
773 | ret = mtd->is_locked(mtd, einfo.start, einfo.length); | |
774 | break; | |
775 | } | |
776 | ||
5bd34c09 | 777 | /* Legacy interface */ |
1da177e4 LT |
778 | case MEMGETOOBSEL: |
779 | { | |
5bd34c09 TG |
780 | struct nand_oobinfo oi; |
781 | ||
782 | if (!mtd->ecclayout) | |
783 | return -EOPNOTSUPP; | |
784 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
785 | return -EINVAL; | |
786 | ||
787 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
788 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
789 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
790 | sizeof(oi.oobfree)); | |
d25ade71 | 791 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
792 | |
793 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
794 | return -EFAULT; |
795 | break; | |
796 | } | |
797 | ||
798 | case MEMGETBADBLOCK: | |
799 | { | |
800 | loff_t offs; | |
97894cda | 801 | |
1da177e4 LT |
802 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
803 | return -EFAULT; | |
804 | if (!mtd->block_isbad) | |
805 | ret = -EOPNOTSUPP; | |
806 | else | |
807 | return mtd->block_isbad(mtd, offs); | |
808 | break; | |
809 | } | |
810 | ||
811 | case MEMSETBADBLOCK: | |
812 | { | |
813 | loff_t offs; | |
814 | ||
815 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
816 | return -EFAULT; | |
817 | if (!mtd->block_markbad) | |
818 | ret = -EOPNOTSUPP; | |
819 | else | |
820 | return mtd->block_markbad(mtd, offs); | |
821 | break; | |
822 | } | |
823 | ||
34a82443 | 824 | #ifdef CONFIG_HAVE_MTD_OTP |
31f4233b NP |
825 | case OTPSELECT: |
826 | { | |
827 | int mode; | |
828 | if (copy_from_user(&mode, argp, sizeof(int))) | |
829 | return -EFAULT; | |
f1a28c02 TG |
830 | |
831 | mfi->mode = MTD_MODE_NORMAL; | |
832 | ||
833 | ret = otp_select_filemode(mfi, mode); | |
834 | ||
81dba488 | 835 | file->f_pos = 0; |
31f4233b NP |
836 | break; |
837 | } | |
838 | ||
839 | case OTPGETREGIONCOUNT: | |
840 | case OTPGETREGIONINFO: | |
841 | { | |
842 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
843 | if (!buf) | |
844 | return -ENOMEM; | |
845 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
846 | switch (mfi->mode) { |
847 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
848 | if (mtd->get_fact_prot_info) |
849 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
850 | break; | |
851 | case MTD_MODE_OTP_USER: | |
852 | if (mtd->get_user_prot_info) | |
853 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
854 | break; | |
f1a28c02 TG |
855 | default: |
856 | break; | |
31f4233b NP |
857 | } |
858 | if (ret >= 0) { | |
859 | if (cmd == OTPGETREGIONCOUNT) { | |
860 | int nbr = ret / sizeof(struct otp_info); | |
861 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
862 | } else | |
863 | ret = copy_to_user(argp, buf, ret); | |
864 | if (ret) | |
865 | ret = -EFAULT; | |
866 | } | |
867 | kfree(buf); | |
868 | break; | |
869 | } | |
870 | ||
871 | case OTPLOCK: | |
872 | { | |
175428b2 | 873 | struct otp_info oinfo; |
31f4233b | 874 | |
f1a28c02 | 875 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b | 876 | return -EINVAL; |
175428b2 | 877 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b NP |
878 | return -EFAULT; |
879 | if (!mtd->lock_user_prot_reg) | |
880 | return -EOPNOTSUPP; | |
175428b2 | 881 | ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
882 | break; |
883 | } | |
884 | #endif | |
885 | ||
cc26c3cd | 886 | /* This ioctl is being deprecated - it truncates the ecc layout */ |
f1a28c02 TG |
887 | case ECCGETLAYOUT: |
888 | { | |
cc26c3cd BN |
889 | struct nand_ecclayout_user *usrlay; |
890 | ||
f1a28c02 TG |
891 | if (!mtd->ecclayout) |
892 | return -EOPNOTSUPP; | |
893 | ||
cc26c3cd BN |
894 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
895 | if (!usrlay) | |
896 | return -ENOMEM; | |
897 | ||
898 | shrink_ecclayout(mtd->ecclayout, usrlay); | |
899 | ||
900 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
901 | ret = -EFAULT; | |
902 | kfree(usrlay); | |
f1a28c02 TG |
903 | break; |
904 | } | |
905 | ||
906 | case ECCGETSTATS: | |
907 | { | |
908 | if (copy_to_user(argp, &mtd->ecc_stats, | |
909 | sizeof(struct mtd_ecc_stats))) | |
910 | return -EFAULT; | |
911 | break; | |
912 | } | |
913 | ||
914 | case MTDFILEMODE: | |
915 | { | |
916 | mfi->mode = 0; | |
917 | ||
918 | switch(arg) { | |
919 | case MTD_MODE_OTP_FACTORY: | |
920 | case MTD_MODE_OTP_USER: | |
921 | ret = otp_select_filemode(mfi, arg); | |
922 | break; | |
923 | ||
924 | case MTD_MODE_RAW: | |
925 | if (!mtd->read_oob || !mtd->write_oob) | |
926 | return -EOPNOTSUPP; | |
927 | mfi->mode = arg; | |
928 | ||
929 | case MTD_MODE_NORMAL: | |
930 | break; | |
931 | default: | |
932 | ret = -EINVAL; | |
933 | } | |
934 | file->f_pos = 0; | |
935 | break; | |
936 | } | |
937 | ||
d0f7959e RT |
938 | case BLKPG: |
939 | { | |
940 | ret = mtd_blkpg_ioctl(mtd, | |
941 | (struct blkpg_ioctl_arg __user *)arg); | |
942 | break; | |
943 | } | |
944 | ||
945 | case BLKRRPART: | |
946 | { | |
947 | /* No reread partition feature. Just return ok */ | |
948 | ret = 0; | |
949 | break; | |
950 | } | |
d0f7959e | 951 | |
1da177e4 LT |
952 | default: |
953 | ret = -ENOTTY; | |
954 | } | |
955 | ||
956 | return ret; | |
957 | } /* memory_ioctl */ | |
958 | ||
55929332 AB |
959 | static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
960 | { | |
961 | int ret; | |
962 | ||
5aa82940 | 963 | mutex_lock(&mtd_mutex); |
55929332 | 964 | ret = mtd_ioctl(file, cmd, arg); |
5aa82940 | 965 | mutex_unlock(&mtd_mutex); |
55929332 AB |
966 | |
967 | return ret; | |
968 | } | |
969 | ||
97718540 KC |
970 | #ifdef CONFIG_COMPAT |
971 | ||
972 | struct mtd_oob_buf32 { | |
973 | u_int32_t start; | |
974 | u_int32_t length; | |
975 | compat_caddr_t ptr; /* unsigned char* */ | |
976 | }; | |
977 | ||
978 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
979 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
980 | ||
981 | static long mtd_compat_ioctl(struct file *file, unsigned int cmd, | |
982 | unsigned long arg) | |
983 | { | |
984 | struct mtd_file_info *mfi = file->private_data; | |
985 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 986 | void __user *argp = compat_ptr(arg); |
97718540 KC |
987 | int ret = 0; |
988 | ||
5aa82940 | 989 | mutex_lock(&mtd_mutex); |
97718540 KC |
990 | |
991 | switch (cmd) { | |
992 | case MEMWRITEOOB32: | |
993 | { | |
994 | struct mtd_oob_buf32 buf; | |
995 | struct mtd_oob_buf32 __user *buf_user = argp; | |
996 | ||
997 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
998 | ret = -EFAULT; | |
999 | else | |
1000 | ret = mtd_do_writeoob(file, mtd, buf.start, | |
1001 | buf.length, compat_ptr(buf.ptr), | |
1002 | &buf_user->length); | |
1003 | break; | |
1004 | } | |
1005 | ||
1006 | case MEMREADOOB32: | |
1007 | { | |
1008 | struct mtd_oob_buf32 buf; | |
1009 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1010 | ||
1011 | /* NOTE: writes return length to buf->start */ | |
1012 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1013 | ret = -EFAULT; | |
1014 | else | |
1015 | ret = mtd_do_readoob(mtd, buf.start, | |
1016 | buf.length, compat_ptr(buf.ptr), | |
1017 | &buf_user->start); | |
1018 | break; | |
1019 | } | |
1020 | default: | |
55929332 | 1021 | ret = mtd_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1022 | } |
1023 | ||
5aa82940 | 1024 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1025 | |
1026 | return ret; | |
1027 | } | |
1028 | ||
1029 | #endif /* CONFIG_COMPAT */ | |
1030 | ||
402d3265 DH |
1031 | /* |
1032 | * try to determine where a shared mapping can be made | |
1033 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1034 | * mappings) | |
1035 | */ | |
1036 | #ifndef CONFIG_MMU | |
1037 | static unsigned long mtd_get_unmapped_area(struct file *file, | |
1038 | unsigned long addr, | |
1039 | unsigned long len, | |
1040 | unsigned long pgoff, | |
1041 | unsigned long flags) | |
1042 | { | |
1043 | struct mtd_file_info *mfi = file->private_data; | |
1044 | struct mtd_info *mtd = mfi->mtd; | |
1045 | ||
1046 | if (mtd->get_unmapped_area) { | |
1047 | unsigned long offset; | |
1048 | ||
1049 | if (addr != 0) | |
1050 | return (unsigned long) -EINVAL; | |
1051 | ||
1052 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) | |
1053 | return (unsigned long) -EINVAL; | |
1054 | ||
1055 | offset = pgoff << PAGE_SHIFT; | |
1056 | if (offset > mtd->size - len) | |
1057 | return (unsigned long) -EINVAL; | |
1058 | ||
1059 | return mtd->get_unmapped_area(mtd, len, offset, flags); | |
1060 | } | |
1061 | ||
1062 | /* can't map directly */ | |
1063 | return (unsigned long) -ENOSYS; | |
1064 | } | |
1065 | #endif | |
1066 | ||
1067 | /* | |
1068 | * set up a mapping for shared memory segments | |
1069 | */ | |
1070 | static int mtd_mmap(struct file *file, struct vm_area_struct *vma) | |
1071 | { | |
1072 | #ifdef CONFIG_MMU | |
1073 | struct mtd_file_info *mfi = file->private_data; | |
1074 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d AG |
1075 | struct map_info *map = mtd->priv; |
1076 | unsigned long start; | |
1077 | unsigned long off; | |
1078 | u32 len; | |
1079 | ||
1080 | if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) { | |
1081 | off = vma->vm_pgoff << PAGE_SHIFT; | |
1082 | start = map->phys; | |
1083 | len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size); | |
1084 | start &= PAGE_MASK; | |
1085 | if ((vma->vm_end - vma->vm_start + off) > len) | |
1086 | return -EINVAL; | |
1087 | ||
1088 | off += start; | |
1089 | vma->vm_pgoff = off >> PAGE_SHIFT; | |
1090 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
1091 | ||
1092 | #ifdef pgprot_noncached | |
1093 | if (file->f_flags & O_DSYNC || off >= __pa(high_memory)) | |
1094 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1095 | #endif | |
1096 | if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, | |
1097 | vma->vm_end - vma->vm_start, | |
1098 | vma->vm_page_prot)) | |
1099 | return -EAGAIN; | |
402d3265 | 1100 | |
402d3265 | 1101 | return 0; |
dd02b67d | 1102 | } |
402d3265 DH |
1103 | return -ENOSYS; |
1104 | #else | |
1105 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; | |
1106 | #endif | |
1107 | } | |
1108 | ||
d54b1fdb | 1109 | static const struct file_operations mtd_fops = { |
1da177e4 LT |
1110 | .owner = THIS_MODULE, |
1111 | .llseek = mtd_lseek, | |
1112 | .read = mtd_read, | |
1113 | .write = mtd_write, | |
55929332 | 1114 | .unlocked_ioctl = mtd_unlocked_ioctl, |
97718540 KC |
1115 | #ifdef CONFIG_COMPAT |
1116 | .compat_ioctl = mtd_compat_ioctl, | |
1117 | #endif | |
1da177e4 LT |
1118 | .open = mtd_open, |
1119 | .release = mtd_close, | |
402d3265 DH |
1120 | .mmap = mtd_mmap, |
1121 | #ifndef CONFIG_MMU | |
1122 | .get_unmapped_area = mtd_get_unmapped_area, | |
1123 | #endif | |
1da177e4 LT |
1124 | }; |
1125 | ||
51139ada AV |
1126 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
1127 | int flags, const char *dev_name, void *data) | |
cd874237 | 1128 | { |
c74a1cbb | 1129 | return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC); |
cd874237 KS |
1130 | } |
1131 | ||
1132 | static struct file_system_type mtd_inodefs_type = { | |
1133 | .name = "mtd_inodefs", | |
51139ada | 1134 | .mount = mtd_inodefs_mount, |
cd874237 KS |
1135 | .kill_sb = kill_anon_super, |
1136 | }; | |
1137 | ||
1138 | static void mtdchar_notify_add(struct mtd_info *mtd) | |
1139 | { | |
1140 | } | |
1141 | ||
1142 | static void mtdchar_notify_remove(struct mtd_info *mtd) | |
1143 | { | |
1144 | struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index); | |
1145 | ||
1146 | if (mtd_ino) { | |
1147 | /* Destroy the inode if it exists */ | |
1148 | mtd_ino->i_nlink = 0; | |
1149 | iput(mtd_ino); | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | static struct mtd_notifier mtdchar_notifier = { | |
1154 | .add = mtdchar_notify_add, | |
1155 | .remove = mtdchar_notify_remove, | |
1156 | }; | |
1157 | ||
1da177e4 LT |
1158 | static int __init init_mtdchar(void) |
1159 | { | |
cd874237 | 1160 | int ret; |
1f24b5a8 | 1161 | |
cd874237 | 1162 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1163 | "mtd", &mtd_fops); |
cd874237 KS |
1164 | if (ret < 0) { |
1165 | pr_notice("Can't allocate major number %d for " | |
1166 | "Memory Technology Devices.\n", MTD_CHAR_MAJOR); | |
1167 | return ret; | |
9bc7b387 TP |
1168 | } |
1169 | ||
cd874237 KS |
1170 | ret = register_filesystem(&mtd_inodefs_type); |
1171 | if (ret) { | |
1172 | pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret); | |
1173 | goto err_unregister_chdev; | |
1174 | } | |
1175 | ||
1176 | mtd_inode_mnt = kern_mount(&mtd_inodefs_type); | |
1177 | if (IS_ERR(mtd_inode_mnt)) { | |
1178 | ret = PTR_ERR(mtd_inode_mnt); | |
1179 | pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret); | |
1180 | goto err_unregister_filesystem; | |
1181 | } | |
1182 | register_mtd_user(&mtdchar_notifier); | |
1183 | ||
1184 | return ret; | |
1185 | ||
1186 | err_unregister_filesystem: | |
1187 | unregister_filesystem(&mtd_inodefs_type); | |
1188 | err_unregister_chdev: | |
1189 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); | |
1190 | return ret; | |
1da177e4 LT |
1191 | } |
1192 | ||
1193 | static void __exit cleanup_mtdchar(void) | |
1194 | { | |
cd874237 | 1195 | unregister_mtd_user(&mtdchar_notifier); |
423e0ab0 | 1196 | kern_unmount(mtd_inode_mnt); |
cd874237 | 1197 | unregister_filesystem(&mtd_inodefs_type); |
dad0db31 | 1198 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | module_init(init_mtdchar); | |
1202 | module_exit(cleanup_mtdchar); | |
1203 | ||
1f24b5a8 | 1204 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |
1da177e4 LT |
1205 | |
1206 | MODULE_LICENSE("GPL"); | |
1207 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1208 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); | |
90160e13 | 1209 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |