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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 | ||
169 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
170 | userspace buffer down and use it directly with readv/writev. | |
171 | */ | |
172 | #define MAX_KMALLOC_SIZE 0x20000 | |
173 | ||
174 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
175 | { | |
f1a28c02 TG |
176 | struct mtd_file_info *mfi = file->private_data; |
177 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
178 | size_t retlen=0; |
179 | size_t total_retlen=0; | |
180 | int ret=0; | |
181 | int len; | |
182 | char *kbuf; | |
97894cda | 183 | |
1da177e4 LT |
184 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
185 | ||
186 | if (*ppos + count > mtd->size) | |
187 | count = mtd->size - *ppos; | |
188 | ||
189 | if (!count) | |
190 | return 0; | |
97894cda | 191 | |
1da177e4 LT |
192 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers |
193 | and pass them directly to the MTD functions */ | |
b802c074 TG |
194 | |
195 | if (count > MAX_KMALLOC_SIZE) | |
196 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
197 | else | |
198 | kbuf=kmalloc(count, GFP_KERNEL); | |
199 | ||
200 | if (!kbuf) | |
201 | return -ENOMEM; | |
202 | ||
1da177e4 | 203 | while (count) { |
b802c074 | 204 | |
97894cda | 205 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
206 | len = MAX_KMALLOC_SIZE; |
207 | else | |
208 | len = count; | |
209 | ||
f1a28c02 TG |
210 | switch (mfi->mode) { |
211 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
212 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
213 | break; | |
214 | case MTD_MODE_OTP_USER: | |
215 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
216 | break; | |
f1a28c02 TG |
217 | case MTD_MODE_RAW: |
218 | { | |
219 | struct mtd_oob_ops ops; | |
220 | ||
221 | ops.mode = MTD_OOB_RAW; | |
222 | ops.datbuf = kbuf; | |
223 | ops.oobbuf = NULL; | |
224 | ops.len = len; | |
225 | ||
226 | ret = mtd->read_oob(mtd, *ppos, &ops); | |
227 | retlen = ops.retlen; | |
228 | break; | |
229 | } | |
31f4233b | 230 | default: |
f4a43cfc | 231 | ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 232 | } |
1da177e4 LT |
233 | /* Nand returns -EBADMSG on ecc errors, but it returns |
234 | * the data. For our userspace tools it is important | |
97894cda | 235 | * to dump areas with ecc errors ! |
9a1fcdfd | 236 | * For kernel internal usage it also might return -EUCLEAN |
25985edc | 237 | * to signal the caller that a bitflip has occurred and has |
9a1fcdfd | 238 | * been corrected by the ECC algorithm. |
1da177e4 LT |
239 | * Userspace software which accesses NAND this way |
240 | * must be aware of the fact that it deals with NAND | |
241 | */ | |
9a1fcdfd | 242 | if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { |
1da177e4 LT |
243 | *ppos += retlen; |
244 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 245 | kfree(kbuf); |
1da177e4 LT |
246 | return -EFAULT; |
247 | } | |
248 | else | |
249 | total_retlen += retlen; | |
250 | ||
251 | count -= retlen; | |
252 | buf += retlen; | |
31f4233b NP |
253 | if (retlen == 0) |
254 | count = 0; | |
1da177e4 LT |
255 | } |
256 | else { | |
257 | kfree(kbuf); | |
258 | return ret; | |
259 | } | |
97894cda | 260 | |
1da177e4 LT |
261 | } |
262 | ||
b802c074 | 263 | kfree(kbuf); |
1da177e4 LT |
264 | return total_retlen; |
265 | } /* mtd_read */ | |
266 | ||
267 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
268 | { | |
f1a28c02 TG |
269 | struct mtd_file_info *mfi = file->private_data; |
270 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
271 | char *kbuf; |
272 | size_t retlen; | |
273 | size_t total_retlen=0; | |
274 | int ret=0; | |
275 | int len; | |
276 | ||
277 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 278 | |
1da177e4 LT |
279 | if (*ppos == mtd->size) |
280 | return -ENOSPC; | |
97894cda | 281 | |
1da177e4 LT |
282 | if (*ppos + count > mtd->size) |
283 | count = mtd->size - *ppos; | |
284 | ||
285 | if (!count) | |
286 | return 0; | |
287 | ||
b802c074 TG |
288 | if (count > MAX_KMALLOC_SIZE) |
289 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
290 | else | |
291 | kbuf=kmalloc(count, GFP_KERNEL); | |
292 | ||
293 | if (!kbuf) | |
294 | return -ENOMEM; | |
295 | ||
1da177e4 | 296 | while (count) { |
b802c074 | 297 | |
97894cda | 298 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
299 | len = MAX_KMALLOC_SIZE; |
300 | else | |
301 | len = count; | |
302 | ||
1da177e4 LT |
303 | if (copy_from_user(kbuf, buf, len)) { |
304 | kfree(kbuf); | |
305 | return -EFAULT; | |
306 | } | |
97894cda | 307 | |
f1a28c02 TG |
308 | switch (mfi->mode) { |
309 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
310 | ret = -EROFS; |
311 | break; | |
312 | case MTD_MODE_OTP_USER: | |
313 | if (!mtd->write_user_prot_reg) { | |
314 | ret = -EOPNOTSUPP; | |
315 | break; | |
316 | } | |
317 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
318 | break; | |
f1a28c02 TG |
319 | |
320 | case MTD_MODE_RAW: | |
321 | { | |
322 | struct mtd_oob_ops ops; | |
323 | ||
324 | ops.mode = MTD_OOB_RAW; | |
325 | ops.datbuf = kbuf; | |
326 | ops.oobbuf = NULL; | |
327 | ops.len = len; | |
328 | ||
329 | ret = mtd->write_oob(mtd, *ppos, &ops); | |
330 | retlen = ops.retlen; | |
331 | break; | |
332 | } | |
333 | ||
31f4233b NP |
334 | default: |
335 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
336 | } | |
1da177e4 LT |
337 | if (!ret) { |
338 | *ppos += retlen; | |
339 | total_retlen += retlen; | |
340 | count -= retlen; | |
341 | buf += retlen; | |
342 | } | |
343 | else { | |
344 | kfree(kbuf); | |
345 | return ret; | |
346 | } | |
1da177e4 LT |
347 | } |
348 | ||
b802c074 | 349 | kfree(kbuf); |
1da177e4 LT |
350 | return total_retlen; |
351 | } /* mtd_write */ | |
352 | ||
353 | /*====================================================================== | |
354 | ||
355 | IOCTL calls for getting device parameters. | |
356 | ||
357 | ======================================================================*/ | |
358 | static void mtdchar_erase_callback (struct erase_info *instr) | |
359 | { | |
360 | wake_up((wait_queue_head_t *)instr->priv); | |
361 | } | |
362 | ||
34a82443 | 363 | #ifdef CONFIG_HAVE_MTD_OTP |
f1a28c02 TG |
364 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
365 | { | |
366 | struct mtd_info *mtd = mfi->mtd; | |
367 | int ret = 0; | |
368 | ||
369 | switch (mode) { | |
370 | case MTD_OTP_FACTORY: | |
371 | if (!mtd->read_fact_prot_reg) | |
372 | ret = -EOPNOTSUPP; | |
373 | else | |
374 | mfi->mode = MTD_MODE_OTP_FACTORY; | |
375 | break; | |
376 | case MTD_OTP_USER: | |
377 | if (!mtd->read_fact_prot_reg) | |
378 | ret = -EOPNOTSUPP; | |
379 | else | |
380 | mfi->mode = MTD_MODE_OTP_USER; | |
381 | break; | |
382 | default: | |
383 | ret = -EINVAL; | |
384 | case MTD_OTP_OFF: | |
385 | break; | |
386 | } | |
387 | return ret; | |
388 | } | |
389 | #else | |
390 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
391 | #endif | |
392 | ||
97718540 KC |
393 | static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd, |
394 | uint64_t start, uint32_t length, void __user *ptr, | |
395 | uint32_t __user *retp) | |
396 | { | |
397 | struct mtd_oob_ops ops; | |
398 | uint32_t retlen; | |
399 | int ret = 0; | |
400 | ||
401 | if (!(file->f_mode & FMODE_WRITE)) | |
402 | return -EPERM; | |
403 | ||
404 | if (length > 4096) | |
405 | return -EINVAL; | |
406 | ||
407 | if (!mtd->write_oob) | |
408 | ret = -EOPNOTSUPP; | |
409 | else | |
0040476b | 410 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; |
97718540 KC |
411 | |
412 | if (ret) | |
413 | return ret; | |
414 | ||
415 | ops.ooblen = length; | |
416 | ops.ooboffs = start & (mtd->oobsize - 1); | |
417 | ops.datbuf = NULL; | |
418 | ops.mode = MTD_OOB_PLACE; | |
419 | ||
420 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
421 | return -EINVAL; | |
422 | ||
df1f1d1c JL |
423 | ops.oobbuf = memdup_user(ptr, length); |
424 | if (IS_ERR(ops.oobbuf)) | |
425 | return PTR_ERR(ops.oobbuf); | |
97718540 KC |
426 | |
427 | start &= ~((uint64_t)mtd->oobsize - 1); | |
428 | ret = mtd->write_oob(mtd, start, &ops); | |
429 | ||
430 | if (ops.oobretlen > 0xFFFFFFFFU) | |
431 | ret = -EOVERFLOW; | |
432 | retlen = ops.oobretlen; | |
433 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
434 | ret = -EFAULT; | |
435 | ||
436 | kfree(ops.oobbuf); | |
437 | return ret; | |
438 | } | |
439 | ||
440 | static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start, | |
441 | uint32_t length, void __user *ptr, uint32_t __user *retp) | |
442 | { | |
443 | struct mtd_oob_ops ops; | |
444 | int ret = 0; | |
445 | ||
446 | if (length > 4096) | |
447 | return -EINVAL; | |
448 | ||
449 | if (!mtd->read_oob) | |
450 | ret = -EOPNOTSUPP; | |
451 | else | |
452 | ret = access_ok(VERIFY_WRITE, ptr, | |
453 | length) ? 0 : -EFAULT; | |
454 | if (ret) | |
455 | return ret; | |
456 | ||
457 | ops.ooblen = length; | |
458 | ops.ooboffs = start & (mtd->oobsize - 1); | |
459 | ops.datbuf = NULL; | |
460 | ops.mode = MTD_OOB_PLACE; | |
461 | ||
462 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
463 | return -EINVAL; | |
464 | ||
465 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
466 | if (!ops.oobbuf) | |
467 | return -ENOMEM; | |
468 | ||
469 | start &= ~((uint64_t)mtd->oobsize - 1); | |
470 | ret = mtd->read_oob(mtd, start, &ops); | |
471 | ||
472 | if (put_user(ops.oobretlen, retp)) | |
473 | ret = -EFAULT; | |
474 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
475 | ops.oobretlen)) | |
476 | ret = -EFAULT; | |
477 | ||
478 | kfree(ops.oobbuf); | |
479 | return ret; | |
480 | } | |
481 | ||
cc26c3cd BN |
482 | /* |
483 | * Copies (and truncates, if necessary) data from the larger struct, | |
484 | * nand_ecclayout, to the smaller, deprecated layout struct, | |
485 | * nand_ecclayout_user. This is necessary only to suppport the deprecated | |
486 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use | |
487 | * nand_ecclayout flexibly (i.e. the struct may change size in new | |
488 | * releases without requiring major rewrites). | |
489 | */ | |
490 | static int shrink_ecclayout(const struct nand_ecclayout *from, | |
491 | struct nand_ecclayout_user *to) | |
492 | { | |
493 | int i; | |
494 | ||
495 | if (!from || !to) | |
496 | return -EINVAL; | |
497 | ||
498 | memset(to, 0, sizeof(*to)); | |
499 | ||
0ceacf36 | 500 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
cc26c3cd BN |
501 | for (i = 0; i < to->eccbytes; i++) |
502 | to->eccpos[i] = from->eccpos[i]; | |
503 | ||
504 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
505 | if (from->oobfree[i].length == 0 && | |
506 | from->oobfree[i].offset == 0) | |
507 | break; | |
508 | to->oobavail += from->oobfree[i].length; | |
509 | to->oobfree[i] = from->oobfree[i]; | |
510 | } | |
511 | ||
512 | return 0; | |
513 | } | |
514 | ||
d0f7959e RT |
515 | #ifdef CONFIG_MTD_PARTITIONS |
516 | static int mtd_blkpg_ioctl(struct mtd_info *mtd, | |
517 | struct blkpg_ioctl_arg __user *arg) | |
518 | { | |
519 | struct blkpg_ioctl_arg a; | |
520 | struct blkpg_partition p; | |
521 | ||
522 | if (!capable(CAP_SYS_ADMIN)) | |
523 | return -EPERM; | |
524 | ||
d0f7959e RT |
525 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
526 | return -EFAULT; | |
527 | ||
528 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
529 | return -EFAULT; | |
530 | ||
531 | switch (a.op) { | |
532 | case BLKPG_ADD_PARTITION: | |
533 | ||
a7e93dcd RT |
534 | /* Only master mtd device must be used to add partitions */ |
535 | if (mtd_is_partition(mtd)) | |
536 | return -EINVAL; | |
537 | ||
d0f7959e RT |
538 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
539 | ||
540 | case BLKPG_DEL_PARTITION: | |
541 | ||
542 | if (p.pno < 0) | |
543 | return -EINVAL; | |
544 | ||
545 | return mtd_del_partition(mtd, p.pno); | |
546 | ||
547 | default: | |
548 | return -EINVAL; | |
549 | } | |
550 | } | |
551 | #endif | |
552 | ||
553 | ||
55929332 | 554 | static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 555 | { |
f1a28c02 TG |
556 | struct mtd_file_info *mfi = file->private_data; |
557 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
558 | void __user *argp = (void __user *)arg; |
559 | int ret = 0; | |
560 | u_long size; | |
73c619ea | 561 | struct mtd_info_user info; |
97894cda | 562 | |
1da177e4 LT |
563 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
564 | ||
565 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
566 | if (cmd & IOC_IN) { | |
567 | if (!access_ok(VERIFY_READ, argp, size)) | |
568 | return -EFAULT; | |
569 | } | |
570 | if (cmd & IOC_OUT) { | |
571 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
572 | return -EFAULT; | |
573 | } | |
97894cda | 574 | |
1da177e4 LT |
575 | switch (cmd) { |
576 | case MEMGETREGIONCOUNT: | |
577 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
578 | return -EFAULT; | |
579 | break; | |
580 | ||
581 | case MEMGETREGIONINFO: | |
582 | { | |
b67c5f87 ZW |
583 | uint32_t ur_idx; |
584 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 585 | struct region_info_user __user *ur = argp; |
1da177e4 | 586 | |
b67c5f87 | 587 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
588 | return -EFAULT; |
589 | ||
5e59be1f DC |
590 | if (ur_idx >= mtd->numeraseregions) |
591 | return -EINVAL; | |
592 | ||
b67c5f87 ZW |
593 | kr = &(mtd->eraseregions[ur_idx]); |
594 | ||
595 | if (put_user(kr->offset, &(ur->offset)) | |
596 | || put_user(kr->erasesize, &(ur->erasesize)) | |
597 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 598 | return -EFAULT; |
b67c5f87 | 599 | |
1da177e4 LT |
600 | break; |
601 | } | |
602 | ||
603 | case MEMGETINFO: | |
a0c5a394 | 604 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
605 | info.type = mtd->type; |
606 | info.flags = mtd->flags; | |
607 | info.size = mtd->size; | |
608 | info.erasesize = mtd->erasesize; | |
609 | info.writesize = mtd->writesize; | |
610 | info.oobsize = mtd->oobsize; | |
64f60710 AB |
611 | /* The below fields are obsolete */ |
612 | info.ecctype = -1; | |
73c619ea | 613 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
614 | return -EFAULT; |
615 | break; | |
616 | ||
617 | case MEMERASE: | |
0dc54e9f | 618 | case MEMERASE64: |
1da177e4 LT |
619 | { |
620 | struct erase_info *erase; | |
621 | ||
aeb5d727 | 622 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
623 | return -EPERM; |
624 | ||
95b93a0c | 625 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
626 | if (!erase) |
627 | ret = -ENOMEM; | |
628 | else { | |
629 | wait_queue_head_t waitq; | |
630 | DECLARE_WAITQUEUE(wait, current); | |
631 | ||
632 | init_waitqueue_head(&waitq); | |
633 | ||
0dc54e9f KC |
634 | if (cmd == MEMERASE64) { |
635 | struct erase_info_user64 einfo64; | |
636 | ||
637 | if (copy_from_user(&einfo64, argp, | |
638 | sizeof(struct erase_info_user64))) { | |
639 | kfree(erase); | |
640 | return -EFAULT; | |
641 | } | |
642 | erase->addr = einfo64.start; | |
643 | erase->len = einfo64.length; | |
644 | } else { | |
645 | struct erase_info_user einfo32; | |
646 | ||
647 | if (copy_from_user(&einfo32, argp, | |
648 | sizeof(struct erase_info_user))) { | |
649 | kfree(erase); | |
650 | return -EFAULT; | |
651 | } | |
652 | erase->addr = einfo32.start; | |
653 | erase->len = einfo32.length; | |
1da177e4 LT |
654 | } |
655 | erase->mtd = mtd; | |
656 | erase->callback = mtdchar_erase_callback; | |
657 | erase->priv = (unsigned long)&waitq; | |
97894cda | 658 | |
1da177e4 LT |
659 | /* |
660 | FIXME: Allow INTERRUPTIBLE. Which means | |
661 | not having the wait_queue head on the stack. | |
97894cda | 662 | |
1da177e4 LT |
663 | If the wq_head is on the stack, and we |
664 | leave because we got interrupted, then the | |
665 | wq_head is no longer there when the | |
666 | callback routine tries to wake us up. | |
667 | */ | |
668 | ret = mtd->erase(mtd, erase); | |
669 | if (!ret) { | |
670 | set_current_state(TASK_UNINTERRUPTIBLE); | |
671 | add_wait_queue(&waitq, &wait); | |
672 | if (erase->state != MTD_ERASE_DONE && | |
673 | erase->state != MTD_ERASE_FAILED) | |
674 | schedule(); | |
675 | remove_wait_queue(&waitq, &wait); | |
676 | set_current_state(TASK_RUNNING); | |
677 | ||
678 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
679 | } | |
680 | kfree(erase); | |
681 | } | |
682 | break; | |
683 | } | |
684 | ||
685 | case MEMWRITEOOB: | |
686 | { | |
687 | struct mtd_oob_buf buf; | |
97718540 | 688 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 689 | |
97718540 KC |
690 | /* NOTE: writes return length to buf_user->length */ |
691 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 692 | ret = -EFAULT; |
97718540 KC |
693 | else |
694 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
695 | buf.ptr, &buf_user->length); | |
1da177e4 | 696 | break; |
1da177e4 LT |
697 | } |
698 | ||
699 | case MEMREADOOB: | |
700 | { | |
701 | struct mtd_oob_buf buf; | |
97718540 | 702 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 703 | |
97718540 KC |
704 | /* NOTE: writes return length to buf_user->start */ |
705 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 706 | ret = -EFAULT; |
97718540 KC |
707 | else |
708 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
709 | buf.ptr, &buf_user->start); | |
1da177e4 LT |
710 | break; |
711 | } | |
712 | ||
aea7cea9 KC |
713 | case MEMWRITEOOB64: |
714 | { | |
715 | struct mtd_oob_buf64 buf; | |
716 | struct mtd_oob_buf64 __user *buf_user = argp; | |
717 | ||
718 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
719 | ret = -EFAULT; | |
720 | else | |
721 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
722 | (void __user *)(uintptr_t)buf.usr_ptr, | |
723 | &buf_user->length); | |
724 | break; | |
725 | } | |
726 | ||
727 | case MEMREADOOB64: | |
728 | { | |
729 | struct mtd_oob_buf64 buf; | |
730 | struct mtd_oob_buf64 __user *buf_user = argp; | |
731 | ||
732 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
733 | ret = -EFAULT; | |
734 | else | |
735 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
736 | (void __user *)(uintptr_t)buf.usr_ptr, | |
737 | &buf_user->length); | |
738 | break; | |
739 | } | |
740 | ||
1da177e4 LT |
741 | case MEMLOCK: |
742 | { | |
175428b2 | 743 | struct erase_info_user einfo; |
1da177e4 | 744 | |
175428b2 | 745 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
746 | return -EFAULT; |
747 | ||
748 | if (!mtd->lock) | |
749 | ret = -EOPNOTSUPP; | |
750 | else | |
175428b2 | 751 | ret = mtd->lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
752 | break; |
753 | } | |
754 | ||
755 | case MEMUNLOCK: | |
756 | { | |
175428b2 | 757 | struct erase_info_user einfo; |
1da177e4 | 758 | |
175428b2 | 759 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
760 | return -EFAULT; |
761 | ||
762 | if (!mtd->unlock) | |
763 | ret = -EOPNOTSUPP; | |
764 | else | |
175428b2 | 765 | ret = mtd->unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
766 | break; |
767 | } | |
768 | ||
9938424f RC |
769 | case MEMISLOCKED: |
770 | { | |
771 | struct erase_info_user einfo; | |
772 | ||
773 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
774 | return -EFAULT; | |
775 | ||
776 | if (!mtd->is_locked) | |
777 | ret = -EOPNOTSUPP; | |
778 | else | |
779 | ret = mtd->is_locked(mtd, einfo.start, einfo.length); | |
780 | break; | |
781 | } | |
782 | ||
5bd34c09 | 783 | /* Legacy interface */ |
1da177e4 LT |
784 | case MEMGETOOBSEL: |
785 | { | |
5bd34c09 TG |
786 | struct nand_oobinfo oi; |
787 | ||
788 | if (!mtd->ecclayout) | |
789 | return -EOPNOTSUPP; | |
790 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
791 | return -EINVAL; | |
792 | ||
793 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
794 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
795 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
796 | sizeof(oi.oobfree)); | |
d25ade71 | 797 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
798 | |
799 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
800 | return -EFAULT; |
801 | break; | |
802 | } | |
803 | ||
804 | case MEMGETBADBLOCK: | |
805 | { | |
806 | loff_t offs; | |
97894cda | 807 | |
1da177e4 LT |
808 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
809 | return -EFAULT; | |
810 | if (!mtd->block_isbad) | |
811 | ret = -EOPNOTSUPP; | |
812 | else | |
813 | return mtd->block_isbad(mtd, offs); | |
814 | break; | |
815 | } | |
816 | ||
817 | case MEMSETBADBLOCK: | |
818 | { | |
819 | loff_t offs; | |
820 | ||
821 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
822 | return -EFAULT; | |
823 | if (!mtd->block_markbad) | |
824 | ret = -EOPNOTSUPP; | |
825 | else | |
826 | return mtd->block_markbad(mtd, offs); | |
827 | break; | |
828 | } | |
829 | ||
34a82443 | 830 | #ifdef CONFIG_HAVE_MTD_OTP |
31f4233b NP |
831 | case OTPSELECT: |
832 | { | |
833 | int mode; | |
834 | if (copy_from_user(&mode, argp, sizeof(int))) | |
835 | return -EFAULT; | |
f1a28c02 TG |
836 | |
837 | mfi->mode = MTD_MODE_NORMAL; | |
838 | ||
839 | ret = otp_select_filemode(mfi, mode); | |
840 | ||
81dba488 | 841 | file->f_pos = 0; |
31f4233b NP |
842 | break; |
843 | } | |
844 | ||
845 | case OTPGETREGIONCOUNT: | |
846 | case OTPGETREGIONINFO: | |
847 | { | |
848 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
849 | if (!buf) | |
850 | return -ENOMEM; | |
851 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
852 | switch (mfi->mode) { |
853 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
854 | if (mtd->get_fact_prot_info) |
855 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
856 | break; | |
857 | case MTD_MODE_OTP_USER: | |
858 | if (mtd->get_user_prot_info) | |
859 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
860 | break; | |
f1a28c02 TG |
861 | default: |
862 | break; | |
31f4233b NP |
863 | } |
864 | if (ret >= 0) { | |
865 | if (cmd == OTPGETREGIONCOUNT) { | |
866 | int nbr = ret / sizeof(struct otp_info); | |
867 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
868 | } else | |
869 | ret = copy_to_user(argp, buf, ret); | |
870 | if (ret) | |
871 | ret = -EFAULT; | |
872 | } | |
873 | kfree(buf); | |
874 | break; | |
875 | } | |
876 | ||
877 | case OTPLOCK: | |
878 | { | |
175428b2 | 879 | struct otp_info oinfo; |
31f4233b | 880 | |
f1a28c02 | 881 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b | 882 | return -EINVAL; |
175428b2 | 883 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b NP |
884 | return -EFAULT; |
885 | if (!mtd->lock_user_prot_reg) | |
886 | return -EOPNOTSUPP; | |
175428b2 | 887 | ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
888 | break; |
889 | } | |
890 | #endif | |
891 | ||
cc26c3cd | 892 | /* This ioctl is being deprecated - it truncates the ecc layout */ |
f1a28c02 TG |
893 | case ECCGETLAYOUT: |
894 | { | |
cc26c3cd BN |
895 | struct nand_ecclayout_user *usrlay; |
896 | ||
f1a28c02 TG |
897 | if (!mtd->ecclayout) |
898 | return -EOPNOTSUPP; | |
899 | ||
cc26c3cd BN |
900 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
901 | if (!usrlay) | |
902 | return -ENOMEM; | |
903 | ||
904 | shrink_ecclayout(mtd->ecclayout, usrlay); | |
905 | ||
906 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
907 | ret = -EFAULT; | |
908 | kfree(usrlay); | |
f1a28c02 TG |
909 | break; |
910 | } | |
911 | ||
912 | case ECCGETSTATS: | |
913 | { | |
914 | if (copy_to_user(argp, &mtd->ecc_stats, | |
915 | sizeof(struct mtd_ecc_stats))) | |
916 | return -EFAULT; | |
917 | break; | |
918 | } | |
919 | ||
920 | case MTDFILEMODE: | |
921 | { | |
922 | mfi->mode = 0; | |
923 | ||
924 | switch(arg) { | |
925 | case MTD_MODE_OTP_FACTORY: | |
926 | case MTD_MODE_OTP_USER: | |
927 | ret = otp_select_filemode(mfi, arg); | |
928 | break; | |
929 | ||
930 | case MTD_MODE_RAW: | |
931 | if (!mtd->read_oob || !mtd->write_oob) | |
932 | return -EOPNOTSUPP; | |
933 | mfi->mode = arg; | |
934 | ||
935 | case MTD_MODE_NORMAL: | |
936 | break; | |
937 | default: | |
938 | ret = -EINVAL; | |
939 | } | |
940 | file->f_pos = 0; | |
941 | break; | |
942 | } | |
943 | ||
d0f7959e RT |
944 | #ifdef CONFIG_MTD_PARTITIONS |
945 | case BLKPG: | |
946 | { | |
947 | ret = mtd_blkpg_ioctl(mtd, | |
948 | (struct blkpg_ioctl_arg __user *)arg); | |
949 | break; | |
950 | } | |
951 | ||
952 | case BLKRRPART: | |
953 | { | |
954 | /* No reread partition feature. Just return ok */ | |
955 | ret = 0; | |
956 | break; | |
957 | } | |
958 | #endif | |
959 | ||
1da177e4 LT |
960 | default: |
961 | ret = -ENOTTY; | |
962 | } | |
963 | ||
964 | return ret; | |
965 | } /* memory_ioctl */ | |
966 | ||
55929332 AB |
967 | static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
968 | { | |
969 | int ret; | |
970 | ||
5aa82940 | 971 | mutex_lock(&mtd_mutex); |
55929332 | 972 | ret = mtd_ioctl(file, cmd, arg); |
5aa82940 | 973 | mutex_unlock(&mtd_mutex); |
55929332 AB |
974 | |
975 | return ret; | |
976 | } | |
977 | ||
97718540 KC |
978 | #ifdef CONFIG_COMPAT |
979 | ||
980 | struct mtd_oob_buf32 { | |
981 | u_int32_t start; | |
982 | u_int32_t length; | |
983 | compat_caddr_t ptr; /* unsigned char* */ | |
984 | }; | |
985 | ||
986 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
987 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
988 | ||
989 | static long mtd_compat_ioctl(struct file *file, unsigned int cmd, | |
990 | unsigned long arg) | |
991 | { | |
992 | struct mtd_file_info *mfi = file->private_data; | |
993 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 994 | void __user *argp = compat_ptr(arg); |
97718540 KC |
995 | int ret = 0; |
996 | ||
5aa82940 | 997 | mutex_lock(&mtd_mutex); |
97718540 KC |
998 | |
999 | switch (cmd) { | |
1000 | case MEMWRITEOOB32: | |
1001 | { | |
1002 | struct mtd_oob_buf32 buf; | |
1003 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1004 | ||
1005 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1006 | ret = -EFAULT; | |
1007 | else | |
1008 | ret = mtd_do_writeoob(file, mtd, buf.start, | |
1009 | buf.length, compat_ptr(buf.ptr), | |
1010 | &buf_user->length); | |
1011 | break; | |
1012 | } | |
1013 | ||
1014 | case MEMREADOOB32: | |
1015 | { | |
1016 | struct mtd_oob_buf32 buf; | |
1017 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1018 | ||
1019 | /* NOTE: writes return length to buf->start */ | |
1020 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1021 | ret = -EFAULT; | |
1022 | else | |
1023 | ret = mtd_do_readoob(mtd, buf.start, | |
1024 | buf.length, compat_ptr(buf.ptr), | |
1025 | &buf_user->start); | |
1026 | break; | |
1027 | } | |
1028 | default: | |
55929332 | 1029 | ret = mtd_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1030 | } |
1031 | ||
5aa82940 | 1032 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1033 | |
1034 | return ret; | |
1035 | } | |
1036 | ||
1037 | #endif /* CONFIG_COMPAT */ | |
1038 | ||
402d3265 DH |
1039 | /* |
1040 | * try to determine where a shared mapping can be made | |
1041 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1042 | * mappings) | |
1043 | */ | |
1044 | #ifndef CONFIG_MMU | |
1045 | static unsigned long mtd_get_unmapped_area(struct file *file, | |
1046 | unsigned long addr, | |
1047 | unsigned long len, | |
1048 | unsigned long pgoff, | |
1049 | unsigned long flags) | |
1050 | { | |
1051 | struct mtd_file_info *mfi = file->private_data; | |
1052 | struct mtd_info *mtd = mfi->mtd; | |
1053 | ||
1054 | if (mtd->get_unmapped_area) { | |
1055 | unsigned long offset; | |
1056 | ||
1057 | if (addr != 0) | |
1058 | return (unsigned long) -EINVAL; | |
1059 | ||
1060 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) | |
1061 | return (unsigned long) -EINVAL; | |
1062 | ||
1063 | offset = pgoff << PAGE_SHIFT; | |
1064 | if (offset > mtd->size - len) | |
1065 | return (unsigned long) -EINVAL; | |
1066 | ||
1067 | return mtd->get_unmapped_area(mtd, len, offset, flags); | |
1068 | } | |
1069 | ||
1070 | /* can't map directly */ | |
1071 | return (unsigned long) -ENOSYS; | |
1072 | } | |
1073 | #endif | |
1074 | ||
1075 | /* | |
1076 | * set up a mapping for shared memory segments | |
1077 | */ | |
1078 | static int mtd_mmap(struct file *file, struct vm_area_struct *vma) | |
1079 | { | |
1080 | #ifdef CONFIG_MMU | |
1081 | struct mtd_file_info *mfi = file->private_data; | |
1082 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d AG |
1083 | struct map_info *map = mtd->priv; |
1084 | unsigned long start; | |
1085 | unsigned long off; | |
1086 | u32 len; | |
1087 | ||
1088 | if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) { | |
1089 | off = vma->vm_pgoff << PAGE_SHIFT; | |
1090 | start = map->phys; | |
1091 | len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size); | |
1092 | start &= PAGE_MASK; | |
1093 | if ((vma->vm_end - vma->vm_start + off) > len) | |
1094 | return -EINVAL; | |
1095 | ||
1096 | off += start; | |
1097 | vma->vm_pgoff = off >> PAGE_SHIFT; | |
1098 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
1099 | ||
1100 | #ifdef pgprot_noncached | |
1101 | if (file->f_flags & O_DSYNC || off >= __pa(high_memory)) | |
1102 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1103 | #endif | |
1104 | if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, | |
1105 | vma->vm_end - vma->vm_start, | |
1106 | vma->vm_page_prot)) | |
1107 | return -EAGAIN; | |
402d3265 | 1108 | |
402d3265 | 1109 | return 0; |
dd02b67d | 1110 | } |
402d3265 DH |
1111 | return -ENOSYS; |
1112 | #else | |
1113 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; | |
1114 | #endif | |
1115 | } | |
1116 | ||
d54b1fdb | 1117 | static const struct file_operations mtd_fops = { |
1da177e4 LT |
1118 | .owner = THIS_MODULE, |
1119 | .llseek = mtd_lseek, | |
1120 | .read = mtd_read, | |
1121 | .write = mtd_write, | |
55929332 | 1122 | .unlocked_ioctl = mtd_unlocked_ioctl, |
97718540 KC |
1123 | #ifdef CONFIG_COMPAT |
1124 | .compat_ioctl = mtd_compat_ioctl, | |
1125 | #endif | |
1da177e4 LT |
1126 | .open = mtd_open, |
1127 | .release = mtd_close, | |
402d3265 DH |
1128 | .mmap = mtd_mmap, |
1129 | #ifndef CONFIG_MMU | |
1130 | .get_unmapped_area = mtd_get_unmapped_area, | |
1131 | #endif | |
1da177e4 LT |
1132 | }; |
1133 | ||
51139ada AV |
1134 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
1135 | int flags, const char *dev_name, void *data) | |
cd874237 | 1136 | { |
c74a1cbb | 1137 | return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC); |
cd874237 KS |
1138 | } |
1139 | ||
1140 | static struct file_system_type mtd_inodefs_type = { | |
1141 | .name = "mtd_inodefs", | |
51139ada | 1142 | .mount = mtd_inodefs_mount, |
cd874237 KS |
1143 | .kill_sb = kill_anon_super, |
1144 | }; | |
1145 | ||
1146 | static void mtdchar_notify_add(struct mtd_info *mtd) | |
1147 | { | |
1148 | } | |
1149 | ||
1150 | static void mtdchar_notify_remove(struct mtd_info *mtd) | |
1151 | { | |
1152 | struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index); | |
1153 | ||
1154 | if (mtd_ino) { | |
1155 | /* Destroy the inode if it exists */ | |
1156 | mtd_ino->i_nlink = 0; | |
1157 | iput(mtd_ino); | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | static struct mtd_notifier mtdchar_notifier = { | |
1162 | .add = mtdchar_notify_add, | |
1163 | .remove = mtdchar_notify_remove, | |
1164 | }; | |
1165 | ||
1da177e4 LT |
1166 | static int __init init_mtdchar(void) |
1167 | { | |
cd874237 | 1168 | int ret; |
1f24b5a8 | 1169 | |
cd874237 | 1170 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1171 | "mtd", &mtd_fops); |
cd874237 KS |
1172 | if (ret < 0) { |
1173 | pr_notice("Can't allocate major number %d for " | |
1174 | "Memory Technology Devices.\n", MTD_CHAR_MAJOR); | |
1175 | return ret; | |
9bc7b387 TP |
1176 | } |
1177 | ||
cd874237 KS |
1178 | ret = register_filesystem(&mtd_inodefs_type); |
1179 | if (ret) { | |
1180 | pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret); | |
1181 | goto err_unregister_chdev; | |
1182 | } | |
1183 | ||
1184 | mtd_inode_mnt = kern_mount(&mtd_inodefs_type); | |
1185 | if (IS_ERR(mtd_inode_mnt)) { | |
1186 | ret = PTR_ERR(mtd_inode_mnt); | |
1187 | pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret); | |
1188 | goto err_unregister_filesystem; | |
1189 | } | |
1190 | register_mtd_user(&mtdchar_notifier); | |
1191 | ||
1192 | return ret; | |
1193 | ||
1194 | err_unregister_filesystem: | |
1195 | unregister_filesystem(&mtd_inodefs_type); | |
1196 | err_unregister_chdev: | |
1197 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); | |
1198 | return ret; | |
1da177e4 LT |
1199 | } |
1200 | ||
1201 | static void __exit cleanup_mtdchar(void) | |
1202 | { | |
cd874237 | 1203 | unregister_mtd_user(&mtdchar_notifier); |
f03c6599 | 1204 | mntput(mtd_inode_mnt); |
cd874237 | 1205 | unregister_filesystem(&mtd_inodefs_type); |
dad0db31 | 1206 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1207 | } |
1208 | ||
1209 | module_init(init_mtdchar); | |
1210 | module_exit(cleanup_mtdchar); | |
1211 | ||
1f24b5a8 | 1212 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |
1da177e4 LT |
1213 | |
1214 | MODULE_LICENSE("GPL"); | |
1215 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1216 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); | |
90160e13 | 1217 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |