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Commit | Line | Data |
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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 | 45 | * Data structure to hold the pointer to the mtd device as well |
92394b5c | 46 | * as mode information of 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 | 88 | |
289c0522 | 89 | pr_debug("MTD_open\n"); |
1da177e4 | 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 | 153 | |
289c0522 | 154 | pr_debug("MTD_close\n"); |
1da177e4 | 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 | |
289c0522 | 198 | pr_debug("MTD_read\n"); |
1da177e4 LT |
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 | } |
7854d3f7 | 236 | /* Nand returns -EBADMSG on ECC errors, but it returns |
1da177e4 | 237 | * the data. For our userspace tools it is important |
7854d3f7 | 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 | ||
289c0522 | 281 | pr_debug("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 | { | |
9ce244b3 | 394 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
395 | struct mtd_oob_ops ops; |
396 | uint32_t retlen; | |
397 | int ret = 0; | |
398 | ||
399 | if (!(file->f_mode & FMODE_WRITE)) | |
400 | return -EPERM; | |
401 | ||
402 | if (length > 4096) | |
403 | return -EINVAL; | |
404 | ||
405 | if (!mtd->write_oob) | |
406 | ret = -EOPNOTSUPP; | |
407 | else | |
0040476b | 408 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; |
97718540 KC |
409 | |
410 | if (ret) | |
411 | return ret; | |
412 | ||
413 | ops.ooblen = length; | |
305b93f1 | 414 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 415 | ops.datbuf = NULL; |
9ce244b3 | 416 | ops.mode = (mfi->mode == MTD_MODE_RAW) ? MTD_OOB_RAW : MTD_OOB_PLACE; |
97718540 KC |
417 | |
418 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
419 | return -EINVAL; | |
420 | ||
df1f1d1c JL |
421 | ops.oobbuf = memdup_user(ptr, length); |
422 | if (IS_ERR(ops.oobbuf)) | |
423 | return PTR_ERR(ops.oobbuf); | |
97718540 | 424 | |
305b93f1 | 425 | start &= ~((uint64_t)mtd->writesize - 1); |
97718540 KC |
426 | ret = mtd->write_oob(mtd, start, &ops); |
427 | ||
428 | if (ops.oobretlen > 0xFFFFFFFFU) | |
429 | ret = -EOVERFLOW; | |
430 | retlen = ops.oobretlen; | |
431 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
432 | ret = -EFAULT; | |
433 | ||
434 | kfree(ops.oobbuf); | |
435 | return ret; | |
436 | } | |
437 | ||
438 | static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start, | |
439 | uint32_t length, void __user *ptr, uint32_t __user *retp) | |
440 | { | |
441 | struct mtd_oob_ops ops; | |
442 | int ret = 0; | |
443 | ||
444 | if (length > 4096) | |
445 | return -EINVAL; | |
446 | ||
447 | if (!mtd->read_oob) | |
448 | ret = -EOPNOTSUPP; | |
449 | else | |
450 | ret = access_ok(VERIFY_WRITE, ptr, | |
451 | length) ? 0 : -EFAULT; | |
452 | if (ret) | |
453 | return ret; | |
454 | ||
455 | ops.ooblen = length; | |
305b93f1 | 456 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 KC |
457 | ops.datbuf = NULL; |
458 | ops.mode = MTD_OOB_PLACE; | |
459 | ||
460 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
461 | return -EINVAL; | |
462 | ||
463 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
464 | if (!ops.oobbuf) | |
465 | return -ENOMEM; | |
466 | ||
305b93f1 | 467 | start &= ~((uint64_t)mtd->writesize - 1); |
97718540 KC |
468 | ret = mtd->read_oob(mtd, start, &ops); |
469 | ||
470 | if (put_user(ops.oobretlen, retp)) | |
471 | ret = -EFAULT; | |
472 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
473 | ops.oobretlen)) | |
474 | ret = -EFAULT; | |
475 | ||
476 | kfree(ops.oobbuf); | |
041e4575 BN |
477 | |
478 | /* | |
479 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
480 | * data. For our userspace tools it is important to dump areas | |
481 | * with ECC errors! | |
482 | * For kernel internal usage it also might return -EUCLEAN | |
483 | * to signal the caller that a bitflip has occured and has | |
484 | * been corrected by the ECC algorithm. | |
485 | * | |
c478d7e4 BN |
486 | * Note: currently the standard NAND function, nand_read_oob_std, |
487 | * does not calculate ECC for the OOB area, so do not rely on | |
488 | * this behavior unless you have replaced it with your own. | |
041e4575 BN |
489 | */ |
490 | if (ret == -EUCLEAN || ret == -EBADMSG) | |
491 | return 0; | |
492 | ||
97718540 KC |
493 | return ret; |
494 | } | |
495 | ||
cc26c3cd BN |
496 | /* |
497 | * Copies (and truncates, if necessary) data from the larger struct, | |
498 | * nand_ecclayout, to the smaller, deprecated layout struct, | |
92394b5c | 499 | * nand_ecclayout_user. This is necessary only to support the deprecated |
cc26c3cd BN |
500 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use |
501 | * nand_ecclayout flexibly (i.e. the struct may change size in new | |
502 | * releases without requiring major rewrites). | |
503 | */ | |
504 | static int shrink_ecclayout(const struct nand_ecclayout *from, | |
505 | struct nand_ecclayout_user *to) | |
506 | { | |
507 | int i; | |
508 | ||
509 | if (!from || !to) | |
510 | return -EINVAL; | |
511 | ||
512 | memset(to, 0, sizeof(*to)); | |
513 | ||
0ceacf36 | 514 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
cc26c3cd BN |
515 | for (i = 0; i < to->eccbytes; i++) |
516 | to->eccpos[i] = from->eccpos[i]; | |
517 | ||
518 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
519 | if (from->oobfree[i].length == 0 && | |
520 | from->oobfree[i].offset == 0) | |
521 | break; | |
522 | to->oobavail += from->oobfree[i].length; | |
523 | to->oobfree[i] = from->oobfree[i]; | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
d0f7959e RT |
529 | static int mtd_blkpg_ioctl(struct mtd_info *mtd, |
530 | struct blkpg_ioctl_arg __user *arg) | |
531 | { | |
532 | struct blkpg_ioctl_arg a; | |
533 | struct blkpg_partition p; | |
534 | ||
535 | if (!capable(CAP_SYS_ADMIN)) | |
536 | return -EPERM; | |
537 | ||
d0f7959e RT |
538 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
539 | return -EFAULT; | |
540 | ||
541 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
542 | return -EFAULT; | |
543 | ||
544 | switch (a.op) { | |
545 | case BLKPG_ADD_PARTITION: | |
546 | ||
a7e93dcd RT |
547 | /* Only master mtd device must be used to add partitions */ |
548 | if (mtd_is_partition(mtd)) | |
549 | return -EINVAL; | |
550 | ||
d0f7959e RT |
551 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
552 | ||
553 | case BLKPG_DEL_PARTITION: | |
554 | ||
555 | if (p.pno < 0) | |
556 | return -EINVAL; | |
557 | ||
558 | return mtd_del_partition(mtd, p.pno); | |
559 | ||
560 | default: | |
561 | return -EINVAL; | |
562 | } | |
563 | } | |
d0f7959e | 564 | |
55929332 | 565 | static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 566 | { |
f1a28c02 TG |
567 | struct mtd_file_info *mfi = file->private_data; |
568 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
569 | void __user *argp = (void __user *)arg; |
570 | int ret = 0; | |
571 | u_long size; | |
73c619ea | 572 | struct mtd_info_user info; |
97894cda | 573 | |
289c0522 | 574 | pr_debug("MTD_ioctl\n"); |
1da177e4 LT |
575 | |
576 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
577 | if (cmd & IOC_IN) { | |
578 | if (!access_ok(VERIFY_READ, argp, size)) | |
579 | return -EFAULT; | |
580 | } | |
581 | if (cmd & IOC_OUT) { | |
582 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
583 | return -EFAULT; | |
584 | } | |
97894cda | 585 | |
1da177e4 LT |
586 | switch (cmd) { |
587 | case MEMGETREGIONCOUNT: | |
588 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
589 | return -EFAULT; | |
590 | break; | |
591 | ||
592 | case MEMGETREGIONINFO: | |
593 | { | |
b67c5f87 ZW |
594 | uint32_t ur_idx; |
595 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 596 | struct region_info_user __user *ur = argp; |
1da177e4 | 597 | |
b67c5f87 | 598 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
599 | return -EFAULT; |
600 | ||
5e59be1f DC |
601 | if (ur_idx >= mtd->numeraseregions) |
602 | return -EINVAL; | |
603 | ||
b67c5f87 ZW |
604 | kr = &(mtd->eraseregions[ur_idx]); |
605 | ||
606 | if (put_user(kr->offset, &(ur->offset)) | |
607 | || put_user(kr->erasesize, &(ur->erasesize)) | |
608 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 609 | return -EFAULT; |
b67c5f87 | 610 | |
1da177e4 LT |
611 | break; |
612 | } | |
613 | ||
614 | case MEMGETINFO: | |
a0c5a394 | 615 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
616 | info.type = mtd->type; |
617 | info.flags = mtd->flags; | |
618 | info.size = mtd->size; | |
619 | info.erasesize = mtd->erasesize; | |
620 | info.writesize = mtd->writesize; | |
621 | info.oobsize = mtd->oobsize; | |
64f60710 AB |
622 | /* The below fields are obsolete */ |
623 | info.ecctype = -1; | |
73c619ea | 624 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
625 | return -EFAULT; |
626 | break; | |
627 | ||
628 | case MEMERASE: | |
0dc54e9f | 629 | case MEMERASE64: |
1da177e4 LT |
630 | { |
631 | struct erase_info *erase; | |
632 | ||
aeb5d727 | 633 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
634 | return -EPERM; |
635 | ||
95b93a0c | 636 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
637 | if (!erase) |
638 | ret = -ENOMEM; | |
639 | else { | |
640 | wait_queue_head_t waitq; | |
641 | DECLARE_WAITQUEUE(wait, current); | |
642 | ||
643 | init_waitqueue_head(&waitq); | |
644 | ||
0dc54e9f KC |
645 | if (cmd == MEMERASE64) { |
646 | struct erase_info_user64 einfo64; | |
647 | ||
648 | if (copy_from_user(&einfo64, argp, | |
649 | sizeof(struct erase_info_user64))) { | |
650 | kfree(erase); | |
651 | return -EFAULT; | |
652 | } | |
653 | erase->addr = einfo64.start; | |
654 | erase->len = einfo64.length; | |
655 | } else { | |
656 | struct erase_info_user einfo32; | |
657 | ||
658 | if (copy_from_user(&einfo32, argp, | |
659 | sizeof(struct erase_info_user))) { | |
660 | kfree(erase); | |
661 | return -EFAULT; | |
662 | } | |
663 | erase->addr = einfo32.start; | |
664 | erase->len = einfo32.length; | |
1da177e4 LT |
665 | } |
666 | erase->mtd = mtd; | |
667 | erase->callback = mtdchar_erase_callback; | |
668 | erase->priv = (unsigned long)&waitq; | |
97894cda | 669 | |
1da177e4 LT |
670 | /* |
671 | FIXME: Allow INTERRUPTIBLE. Which means | |
672 | not having the wait_queue head on the stack. | |
97894cda | 673 | |
1da177e4 LT |
674 | If the wq_head is on the stack, and we |
675 | leave because we got interrupted, then the | |
676 | wq_head is no longer there when the | |
677 | callback routine tries to wake us up. | |
678 | */ | |
679 | ret = mtd->erase(mtd, erase); | |
680 | if (!ret) { | |
681 | set_current_state(TASK_UNINTERRUPTIBLE); | |
682 | add_wait_queue(&waitq, &wait); | |
683 | if (erase->state != MTD_ERASE_DONE && | |
684 | erase->state != MTD_ERASE_FAILED) | |
685 | schedule(); | |
686 | remove_wait_queue(&waitq, &wait); | |
687 | set_current_state(TASK_RUNNING); | |
688 | ||
689 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
690 | } | |
691 | kfree(erase); | |
692 | } | |
693 | break; | |
694 | } | |
695 | ||
696 | case MEMWRITEOOB: | |
697 | { | |
698 | struct mtd_oob_buf buf; | |
97718540 | 699 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 700 | |
97718540 KC |
701 | /* NOTE: writes return length to buf_user->length */ |
702 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 703 | ret = -EFAULT; |
97718540 KC |
704 | else |
705 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
706 | buf.ptr, &buf_user->length); | |
1da177e4 | 707 | break; |
1da177e4 LT |
708 | } |
709 | ||
710 | case MEMREADOOB: | |
711 | { | |
712 | struct mtd_oob_buf buf; | |
97718540 | 713 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 714 | |
97718540 KC |
715 | /* NOTE: writes return length to buf_user->start */ |
716 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 717 | ret = -EFAULT; |
97718540 KC |
718 | else |
719 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
720 | buf.ptr, &buf_user->start); | |
1da177e4 LT |
721 | break; |
722 | } | |
723 | ||
aea7cea9 KC |
724 | case MEMWRITEOOB64: |
725 | { | |
726 | struct mtd_oob_buf64 buf; | |
727 | struct mtd_oob_buf64 __user *buf_user = argp; | |
728 | ||
729 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
730 | ret = -EFAULT; | |
731 | else | |
732 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
733 | (void __user *)(uintptr_t)buf.usr_ptr, | |
734 | &buf_user->length); | |
735 | break; | |
736 | } | |
737 | ||
738 | case MEMREADOOB64: | |
739 | { | |
740 | struct mtd_oob_buf64 buf; | |
741 | struct mtd_oob_buf64 __user *buf_user = argp; | |
742 | ||
743 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
744 | ret = -EFAULT; | |
745 | else | |
746 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
747 | (void __user *)(uintptr_t)buf.usr_ptr, | |
748 | &buf_user->length); | |
749 | break; | |
750 | } | |
751 | ||
1da177e4 LT |
752 | case MEMLOCK: |
753 | { | |
175428b2 | 754 | struct erase_info_user einfo; |
1da177e4 | 755 | |
175428b2 | 756 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
757 | return -EFAULT; |
758 | ||
759 | if (!mtd->lock) | |
760 | ret = -EOPNOTSUPP; | |
761 | else | |
175428b2 | 762 | ret = mtd->lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
763 | break; |
764 | } | |
765 | ||
766 | case MEMUNLOCK: | |
767 | { | |
175428b2 | 768 | struct erase_info_user einfo; |
1da177e4 | 769 | |
175428b2 | 770 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
771 | return -EFAULT; |
772 | ||
773 | if (!mtd->unlock) | |
774 | ret = -EOPNOTSUPP; | |
775 | else | |
175428b2 | 776 | ret = mtd->unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
777 | break; |
778 | } | |
779 | ||
9938424f RC |
780 | case MEMISLOCKED: |
781 | { | |
782 | struct erase_info_user einfo; | |
783 | ||
784 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
785 | return -EFAULT; | |
786 | ||
787 | if (!mtd->is_locked) | |
788 | ret = -EOPNOTSUPP; | |
789 | else | |
790 | ret = mtd->is_locked(mtd, einfo.start, einfo.length); | |
791 | break; | |
792 | } | |
793 | ||
5bd34c09 | 794 | /* Legacy interface */ |
1da177e4 LT |
795 | case MEMGETOOBSEL: |
796 | { | |
5bd34c09 TG |
797 | struct nand_oobinfo oi; |
798 | ||
799 | if (!mtd->ecclayout) | |
800 | return -EOPNOTSUPP; | |
801 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
802 | return -EINVAL; | |
803 | ||
804 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
805 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
806 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
807 | sizeof(oi.oobfree)); | |
d25ade71 | 808 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
809 | |
810 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
811 | return -EFAULT; |
812 | break; | |
813 | } | |
814 | ||
815 | case MEMGETBADBLOCK: | |
816 | { | |
817 | loff_t offs; | |
97894cda | 818 | |
1da177e4 LT |
819 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
820 | return -EFAULT; | |
821 | if (!mtd->block_isbad) | |
822 | ret = -EOPNOTSUPP; | |
823 | else | |
824 | return mtd->block_isbad(mtd, offs); | |
825 | break; | |
826 | } | |
827 | ||
828 | case MEMSETBADBLOCK: | |
829 | { | |
830 | loff_t offs; | |
831 | ||
832 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
833 | return -EFAULT; | |
834 | if (!mtd->block_markbad) | |
835 | ret = -EOPNOTSUPP; | |
836 | else | |
837 | return mtd->block_markbad(mtd, offs); | |
838 | break; | |
839 | } | |
840 | ||
34a82443 | 841 | #ifdef CONFIG_HAVE_MTD_OTP |
31f4233b NP |
842 | case OTPSELECT: |
843 | { | |
844 | int mode; | |
845 | if (copy_from_user(&mode, argp, sizeof(int))) | |
846 | return -EFAULT; | |
f1a28c02 TG |
847 | |
848 | mfi->mode = MTD_MODE_NORMAL; | |
849 | ||
850 | ret = otp_select_filemode(mfi, mode); | |
851 | ||
81dba488 | 852 | file->f_pos = 0; |
31f4233b NP |
853 | break; |
854 | } | |
855 | ||
856 | case OTPGETREGIONCOUNT: | |
857 | case OTPGETREGIONINFO: | |
858 | { | |
859 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
860 | if (!buf) | |
861 | return -ENOMEM; | |
862 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
863 | switch (mfi->mode) { |
864 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
865 | if (mtd->get_fact_prot_info) |
866 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
867 | break; | |
868 | case MTD_MODE_OTP_USER: | |
869 | if (mtd->get_user_prot_info) | |
870 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
871 | break; | |
f1a28c02 TG |
872 | default: |
873 | break; | |
31f4233b NP |
874 | } |
875 | if (ret >= 0) { | |
876 | if (cmd == OTPGETREGIONCOUNT) { | |
877 | int nbr = ret / sizeof(struct otp_info); | |
878 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
879 | } else | |
880 | ret = copy_to_user(argp, buf, ret); | |
881 | if (ret) | |
882 | ret = -EFAULT; | |
883 | } | |
884 | kfree(buf); | |
885 | break; | |
886 | } | |
887 | ||
888 | case OTPLOCK: | |
889 | { | |
175428b2 | 890 | struct otp_info oinfo; |
31f4233b | 891 | |
f1a28c02 | 892 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b | 893 | return -EINVAL; |
175428b2 | 894 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b NP |
895 | return -EFAULT; |
896 | if (!mtd->lock_user_prot_reg) | |
897 | return -EOPNOTSUPP; | |
175428b2 | 898 | ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
899 | break; |
900 | } | |
901 | #endif | |
902 | ||
7854d3f7 | 903 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
904 | case ECCGETLAYOUT: |
905 | { | |
cc26c3cd BN |
906 | struct nand_ecclayout_user *usrlay; |
907 | ||
f1a28c02 TG |
908 | if (!mtd->ecclayout) |
909 | return -EOPNOTSUPP; | |
910 | ||
cc26c3cd BN |
911 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
912 | if (!usrlay) | |
913 | return -ENOMEM; | |
914 | ||
915 | shrink_ecclayout(mtd->ecclayout, usrlay); | |
916 | ||
917 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
918 | ret = -EFAULT; | |
919 | kfree(usrlay); | |
f1a28c02 TG |
920 | break; |
921 | } | |
922 | ||
923 | case ECCGETSTATS: | |
924 | { | |
925 | if (copy_to_user(argp, &mtd->ecc_stats, | |
926 | sizeof(struct mtd_ecc_stats))) | |
927 | return -EFAULT; | |
928 | break; | |
929 | } | |
930 | ||
931 | case MTDFILEMODE: | |
932 | { | |
933 | mfi->mode = 0; | |
934 | ||
935 | switch(arg) { | |
936 | case MTD_MODE_OTP_FACTORY: | |
937 | case MTD_MODE_OTP_USER: | |
938 | ret = otp_select_filemode(mfi, arg); | |
939 | break; | |
940 | ||
941 | case MTD_MODE_RAW: | |
942 | if (!mtd->read_oob || !mtd->write_oob) | |
943 | return -EOPNOTSUPP; | |
944 | mfi->mode = arg; | |
945 | ||
946 | case MTD_MODE_NORMAL: | |
947 | break; | |
948 | default: | |
949 | ret = -EINVAL; | |
950 | } | |
951 | file->f_pos = 0; | |
952 | break; | |
953 | } | |
954 | ||
d0f7959e RT |
955 | case BLKPG: |
956 | { | |
957 | ret = mtd_blkpg_ioctl(mtd, | |
958 | (struct blkpg_ioctl_arg __user *)arg); | |
959 | break; | |
960 | } | |
961 | ||
962 | case BLKRRPART: | |
963 | { | |
964 | /* No reread partition feature. Just return ok */ | |
965 | ret = 0; | |
966 | break; | |
967 | } | |
d0f7959e | 968 | |
1da177e4 LT |
969 | default: |
970 | ret = -ENOTTY; | |
971 | } | |
972 | ||
973 | return ret; | |
974 | } /* memory_ioctl */ | |
975 | ||
55929332 AB |
976 | static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
977 | { | |
978 | int ret; | |
979 | ||
5aa82940 | 980 | mutex_lock(&mtd_mutex); |
55929332 | 981 | ret = mtd_ioctl(file, cmd, arg); |
5aa82940 | 982 | mutex_unlock(&mtd_mutex); |
55929332 AB |
983 | |
984 | return ret; | |
985 | } | |
986 | ||
97718540 KC |
987 | #ifdef CONFIG_COMPAT |
988 | ||
989 | struct mtd_oob_buf32 { | |
990 | u_int32_t start; | |
991 | u_int32_t length; | |
992 | compat_caddr_t ptr; /* unsigned char* */ | |
993 | }; | |
994 | ||
995 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
996 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
997 | ||
998 | static long mtd_compat_ioctl(struct file *file, unsigned int cmd, | |
999 | unsigned long arg) | |
1000 | { | |
1001 | struct mtd_file_info *mfi = file->private_data; | |
1002 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 1003 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1004 | int ret = 0; |
1005 | ||
5aa82940 | 1006 | mutex_lock(&mtd_mutex); |
97718540 KC |
1007 | |
1008 | switch (cmd) { | |
1009 | case MEMWRITEOOB32: | |
1010 | { | |
1011 | struct mtd_oob_buf32 buf; | |
1012 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1013 | ||
1014 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1015 | ret = -EFAULT; | |
1016 | else | |
1017 | ret = mtd_do_writeoob(file, mtd, buf.start, | |
1018 | buf.length, compat_ptr(buf.ptr), | |
1019 | &buf_user->length); | |
1020 | break; | |
1021 | } | |
1022 | ||
1023 | case MEMREADOOB32: | |
1024 | { | |
1025 | struct mtd_oob_buf32 buf; | |
1026 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1027 | ||
1028 | /* NOTE: writes return length to buf->start */ | |
1029 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1030 | ret = -EFAULT; | |
1031 | else | |
1032 | ret = mtd_do_readoob(mtd, buf.start, | |
1033 | buf.length, compat_ptr(buf.ptr), | |
1034 | &buf_user->start); | |
1035 | break; | |
1036 | } | |
1037 | default: | |
55929332 | 1038 | ret = mtd_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1039 | } |
1040 | ||
5aa82940 | 1041 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1042 | |
1043 | return ret; | |
1044 | } | |
1045 | ||
1046 | #endif /* CONFIG_COMPAT */ | |
1047 | ||
402d3265 DH |
1048 | /* |
1049 | * try to determine where a shared mapping can be made | |
1050 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1051 | * mappings) | |
1052 | */ | |
1053 | #ifndef CONFIG_MMU | |
1054 | static unsigned long mtd_get_unmapped_area(struct file *file, | |
1055 | unsigned long addr, | |
1056 | unsigned long len, | |
1057 | unsigned long pgoff, | |
1058 | unsigned long flags) | |
1059 | { | |
1060 | struct mtd_file_info *mfi = file->private_data; | |
1061 | struct mtd_info *mtd = mfi->mtd; | |
1062 | ||
1063 | if (mtd->get_unmapped_area) { | |
1064 | unsigned long offset; | |
1065 | ||
1066 | if (addr != 0) | |
1067 | return (unsigned long) -EINVAL; | |
1068 | ||
1069 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) | |
1070 | return (unsigned long) -EINVAL; | |
1071 | ||
1072 | offset = pgoff << PAGE_SHIFT; | |
1073 | if (offset > mtd->size - len) | |
1074 | return (unsigned long) -EINVAL; | |
1075 | ||
1076 | return mtd->get_unmapped_area(mtd, len, offset, flags); | |
1077 | } | |
1078 | ||
1079 | /* can't map directly */ | |
1080 | return (unsigned long) -ENOSYS; | |
1081 | } | |
1082 | #endif | |
1083 | ||
1084 | /* | |
1085 | * set up a mapping for shared memory segments | |
1086 | */ | |
1087 | static int mtd_mmap(struct file *file, struct vm_area_struct *vma) | |
1088 | { | |
1089 | #ifdef CONFIG_MMU | |
1090 | struct mtd_file_info *mfi = file->private_data; | |
1091 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d AG |
1092 | struct map_info *map = mtd->priv; |
1093 | unsigned long start; | |
1094 | unsigned long off; | |
1095 | u32 len; | |
1096 | ||
1097 | if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) { | |
1098 | off = vma->vm_pgoff << PAGE_SHIFT; | |
1099 | start = map->phys; | |
1100 | len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size); | |
1101 | start &= PAGE_MASK; | |
1102 | if ((vma->vm_end - vma->vm_start + off) > len) | |
1103 | return -EINVAL; | |
1104 | ||
1105 | off += start; | |
1106 | vma->vm_pgoff = off >> PAGE_SHIFT; | |
1107 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
1108 | ||
1109 | #ifdef pgprot_noncached | |
1110 | if (file->f_flags & O_DSYNC || off >= __pa(high_memory)) | |
1111 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1112 | #endif | |
1113 | if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, | |
1114 | vma->vm_end - vma->vm_start, | |
1115 | vma->vm_page_prot)) | |
1116 | return -EAGAIN; | |
402d3265 | 1117 | |
402d3265 | 1118 | return 0; |
dd02b67d | 1119 | } |
402d3265 DH |
1120 | return -ENOSYS; |
1121 | #else | |
1122 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; | |
1123 | #endif | |
1124 | } | |
1125 | ||
d54b1fdb | 1126 | static const struct file_operations mtd_fops = { |
1da177e4 LT |
1127 | .owner = THIS_MODULE, |
1128 | .llseek = mtd_lseek, | |
1129 | .read = mtd_read, | |
1130 | .write = mtd_write, | |
55929332 | 1131 | .unlocked_ioctl = mtd_unlocked_ioctl, |
97718540 KC |
1132 | #ifdef CONFIG_COMPAT |
1133 | .compat_ioctl = mtd_compat_ioctl, | |
1134 | #endif | |
1da177e4 LT |
1135 | .open = mtd_open, |
1136 | .release = mtd_close, | |
402d3265 DH |
1137 | .mmap = mtd_mmap, |
1138 | #ifndef CONFIG_MMU | |
1139 | .get_unmapped_area = mtd_get_unmapped_area, | |
1140 | #endif | |
1da177e4 LT |
1141 | }; |
1142 | ||
51139ada AV |
1143 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
1144 | int flags, const char *dev_name, void *data) | |
cd874237 | 1145 | { |
c74a1cbb | 1146 | return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC); |
cd874237 KS |
1147 | } |
1148 | ||
1149 | static struct file_system_type mtd_inodefs_type = { | |
1150 | .name = "mtd_inodefs", | |
51139ada | 1151 | .mount = mtd_inodefs_mount, |
cd874237 KS |
1152 | .kill_sb = kill_anon_super, |
1153 | }; | |
1154 | ||
1155 | static void mtdchar_notify_add(struct mtd_info *mtd) | |
1156 | { | |
1157 | } | |
1158 | ||
1159 | static void mtdchar_notify_remove(struct mtd_info *mtd) | |
1160 | { | |
1161 | struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index); | |
1162 | ||
1163 | if (mtd_ino) { | |
1164 | /* Destroy the inode if it exists */ | |
1165 | mtd_ino->i_nlink = 0; | |
1166 | iput(mtd_ino); | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | static struct mtd_notifier mtdchar_notifier = { | |
1171 | .add = mtdchar_notify_add, | |
1172 | .remove = mtdchar_notify_remove, | |
1173 | }; | |
1174 | ||
1da177e4 LT |
1175 | static int __init init_mtdchar(void) |
1176 | { | |
cd874237 | 1177 | int ret; |
1f24b5a8 | 1178 | |
cd874237 | 1179 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1180 | "mtd", &mtd_fops); |
cd874237 KS |
1181 | if (ret < 0) { |
1182 | pr_notice("Can't allocate major number %d for " | |
1183 | "Memory Technology Devices.\n", MTD_CHAR_MAJOR); | |
1184 | return ret; | |
9bc7b387 TP |
1185 | } |
1186 | ||
cd874237 KS |
1187 | ret = register_filesystem(&mtd_inodefs_type); |
1188 | if (ret) { | |
1189 | pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret); | |
1190 | goto err_unregister_chdev; | |
1191 | } | |
1192 | ||
1193 | mtd_inode_mnt = kern_mount(&mtd_inodefs_type); | |
1194 | if (IS_ERR(mtd_inode_mnt)) { | |
1195 | ret = PTR_ERR(mtd_inode_mnt); | |
1196 | pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret); | |
1197 | goto err_unregister_filesystem; | |
1198 | } | |
1199 | register_mtd_user(&mtdchar_notifier); | |
1200 | ||
1201 | return ret; | |
1202 | ||
1203 | err_unregister_filesystem: | |
1204 | unregister_filesystem(&mtd_inodefs_type); | |
1205 | err_unregister_chdev: | |
1206 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); | |
1207 | return ret; | |
1da177e4 LT |
1208 | } |
1209 | ||
1210 | static void __exit cleanup_mtdchar(void) | |
1211 | { | |
cd874237 | 1212 | unregister_mtd_user(&mtdchar_notifier); |
423e0ab0 | 1213 | kern_unmount(mtd_inode_mnt); |
cd874237 | 1214 | unregister_filesystem(&mtd_inodefs_type); |
dad0db31 | 1215 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1216 | } |
1217 | ||
1218 | module_init(init_mtdchar); | |
1219 | module_exit(cleanup_mtdchar); | |
1220 | ||
1f24b5a8 | 1221 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |
1da177e4 LT |
1222 | |
1223 | MODULE_LICENSE("GPL"); | |
1224 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1225 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); | |
90160e13 | 1226 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |