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