Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
a1452a37 DW |
2 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 LT |
17 | * |
18 | */ | |
19 | ||
15fdc52f TG |
20 | #include <linux/device.h> |
21 | #include <linux/fs.h> | |
0c1eafdb | 22 | #include <linux/mm.h> |
9c74034f | 23 | #include <linux/err.h> |
15fdc52f | 24 | #include <linux/init.h> |
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> | |
15fdc52f TG |
27 | #include <linux/slab.h> |
28 | #include <linux/sched.h> | |
5aa82940 | 29 | #include <linux/mutex.h> |
402d3265 | 30 | #include <linux/backing-dev.h> |
97718540 | 31 | #include <linux/compat.h> |
cd874237 | 32 | #include <linux/mount.h> |
d0f7959e | 33 | #include <linux/blkpg.h> |
1da177e4 | 34 | #include <linux/mtd/mtd.h> |
d0f7959e | 35 | #include <linux/mtd/partitions.h> |
dd02b67d | 36 | #include <linux/mtd/map.h> |
1da177e4 | 37 | |
15fdc52f | 38 | #include <asm/uaccess.h> |
9bc7b387 | 39 | |
cd874237 | 40 | #define MTD_INODE_FS_MAGIC 0x11307854 |
5aa82940 | 41 | static DEFINE_MUTEX(mtd_mutex); |
cd874237 | 42 | static struct vfsmount *mtd_inode_mnt __read_mostly; |
1da177e4 | 43 | |
045e9a5d | 44 | /* |
f1a28c02 | 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 | 213 | switch (mfi->mode) { |
beb133fc | 214 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
215 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
216 | break; | |
beb133fc | 217 | case MTD_FILE_MODE_OTP_USER: |
31f4233b NP |
218 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
219 | break; | |
beb133fc | 220 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
221 | { |
222 | struct mtd_oob_ops ops; | |
223 | ||
0612b9dd | 224 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
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 | 304 | switch (mfi->mode) { |
beb133fc | 305 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
306 | ret = -EROFS; |
307 | break; | |
beb133fc | 308 | case MTD_FILE_MODE_OTP_USER: |
31f4233b NP |
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 | 315 | |
beb133fc | 316 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
317 | { |
318 | struct mtd_oob_ops ops; | |
319 | ||
0612b9dd | 320 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
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 | |
beb133fc | 371 | mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
f1a28c02 TG |
372 | break; |
373 | case MTD_OTP_USER: | |
374 | if (!mtd->read_fact_prot_reg) | |
375 | ret = -EOPNOTSUPP; | |
376 | else | |
beb133fc | 377 | mfi->mode = MTD_FILE_MODE_OTP_USER; |
f1a28c02 TG |
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; |
beb133fc | 416 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 417 | MTD_OPS_PLACE_OOB; |
97718540 KC |
418 | |
419 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
420 | return -EINVAL; | |
421 | ||
df1f1d1c JL |
422 | ops.oobbuf = memdup_user(ptr, length); |
423 | if (IS_ERR(ops.oobbuf)) | |
424 | return PTR_ERR(ops.oobbuf); | |
97718540 | 425 | |
305b93f1 | 426 | start &= ~((uint64_t)mtd->writesize - 1); |
97718540 KC |
427 | ret = mtd->write_oob(mtd, start, &ops); |
428 | ||
429 | if (ops.oobretlen > 0xFFFFFFFFU) | |
430 | ret = -EOVERFLOW; | |
431 | retlen = ops.oobretlen; | |
432 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
433 | ret = -EFAULT; | |
434 | ||
435 | kfree(ops.oobbuf); | |
436 | return ret; | |
437 | } | |
438 | ||
c46f6483 BN |
439 | static int mtd_do_readoob(struct file *file, struct mtd_info *mtd, |
440 | uint64_t start, uint32_t length, void __user *ptr, | |
441 | uint32_t __user *retp) | |
97718540 | 442 | { |
c46f6483 | 443 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
444 | struct mtd_oob_ops ops; |
445 | int ret = 0; | |
446 | ||
447 | if (length > 4096) | |
448 | return -EINVAL; | |
449 | ||
450 | if (!mtd->read_oob) | |
451 | ret = -EOPNOTSUPP; | |
452 | else | |
453 | ret = access_ok(VERIFY_WRITE, ptr, | |
454 | length) ? 0 : -EFAULT; | |
455 | if (ret) | |
456 | return ret; | |
457 | ||
458 | ops.ooblen = length; | |
305b93f1 | 459 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 460 | ops.datbuf = NULL; |
beb133fc | 461 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 462 | MTD_OPS_PLACE_OOB; |
97718540 KC |
463 | |
464 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
465 | return -EINVAL; | |
466 | ||
467 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
468 | if (!ops.oobbuf) | |
469 | return -ENOMEM; | |
470 | ||
305b93f1 | 471 | start &= ~((uint64_t)mtd->writesize - 1); |
97718540 KC |
472 | ret = mtd->read_oob(mtd, start, &ops); |
473 | ||
474 | if (put_user(ops.oobretlen, retp)) | |
475 | ret = -EFAULT; | |
476 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
477 | ops.oobretlen)) | |
478 | ret = -EFAULT; | |
479 | ||
480 | kfree(ops.oobbuf); | |
041e4575 BN |
481 | |
482 | /* | |
483 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
484 | * data. For our userspace tools it is important to dump areas | |
485 | * with ECC errors! | |
486 | * For kernel internal usage it also might return -EUCLEAN | |
487 | * to signal the caller that a bitflip has occured and has | |
488 | * been corrected by the ECC algorithm. | |
489 | * | |
c478d7e4 BN |
490 | * Note: currently the standard NAND function, nand_read_oob_std, |
491 | * does not calculate ECC for the OOB area, so do not rely on | |
492 | * this behavior unless you have replaced it with your own. | |
041e4575 BN |
493 | */ |
494 | if (ret == -EUCLEAN || ret == -EBADMSG) | |
495 | return 0; | |
496 | ||
97718540 KC |
497 | return ret; |
498 | } | |
499 | ||
cc26c3cd BN |
500 | /* |
501 | * Copies (and truncates, if necessary) data from the larger struct, | |
502 | * nand_ecclayout, to the smaller, deprecated layout struct, | |
92394b5c | 503 | * nand_ecclayout_user. This is necessary only to support the deprecated |
cc26c3cd BN |
504 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use |
505 | * nand_ecclayout flexibly (i.e. the struct may change size in new | |
506 | * releases without requiring major rewrites). | |
507 | */ | |
508 | static int shrink_ecclayout(const struct nand_ecclayout *from, | |
509 | struct nand_ecclayout_user *to) | |
510 | { | |
511 | int i; | |
512 | ||
513 | if (!from || !to) | |
514 | return -EINVAL; | |
515 | ||
516 | memset(to, 0, sizeof(*to)); | |
517 | ||
0ceacf36 | 518 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
cc26c3cd BN |
519 | for (i = 0; i < to->eccbytes; i++) |
520 | to->eccpos[i] = from->eccpos[i]; | |
521 | ||
522 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
523 | if (from->oobfree[i].length == 0 && | |
524 | from->oobfree[i].offset == 0) | |
525 | break; | |
526 | to->oobavail += from->oobfree[i].length; | |
527 | to->oobfree[i] = from->oobfree[i]; | |
528 | } | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
d0f7959e RT |
533 | static int mtd_blkpg_ioctl(struct mtd_info *mtd, |
534 | struct blkpg_ioctl_arg __user *arg) | |
535 | { | |
536 | struct blkpg_ioctl_arg a; | |
537 | struct blkpg_partition p; | |
538 | ||
539 | if (!capable(CAP_SYS_ADMIN)) | |
540 | return -EPERM; | |
541 | ||
d0f7959e RT |
542 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
543 | return -EFAULT; | |
544 | ||
545 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
546 | return -EFAULT; | |
547 | ||
548 | switch (a.op) { | |
549 | case BLKPG_ADD_PARTITION: | |
550 | ||
a7e93dcd RT |
551 | /* Only master mtd device must be used to add partitions */ |
552 | if (mtd_is_partition(mtd)) | |
553 | return -EINVAL; | |
554 | ||
d0f7959e RT |
555 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
556 | ||
557 | case BLKPG_DEL_PARTITION: | |
558 | ||
559 | if (p.pno < 0) | |
560 | return -EINVAL; | |
561 | ||
562 | return mtd_del_partition(mtd, p.pno); | |
563 | ||
564 | default: | |
565 | return -EINVAL; | |
566 | } | |
567 | } | |
d0f7959e | 568 | |
e99d8b08 BN |
569 | static int mtd_write_ioctl(struct mtd_info *mtd, |
570 | struct mtd_write_req __user *argp) | |
571 | { | |
572 | struct mtd_write_req req; | |
573 | struct mtd_oob_ops ops; | |
574 | void __user *usr_data, *usr_oob; | |
575 | int ret; | |
576 | ||
577 | if (copy_from_user(&req, argp, sizeof(req)) || | |
578 | !access_ok(VERIFY_READ, req.usr_data, req.len) || | |
579 | !access_ok(VERIFY_READ, req.usr_oob, req.ooblen)) | |
580 | return -EFAULT; | |
581 | if (!mtd->write_oob) | |
582 | return -EOPNOTSUPP; | |
583 | ||
584 | ops.mode = req.mode; | |
585 | ops.len = (size_t)req.len; | |
586 | ops.ooblen = (size_t)req.ooblen; | |
587 | ops.ooboffs = 0; | |
588 | ||
589 | usr_data = (void __user *)(uintptr_t)req.usr_data; | |
590 | usr_oob = (void __user *)(uintptr_t)req.usr_oob; | |
591 | ||
592 | if (req.usr_data) { | |
593 | ops.datbuf = memdup_user(usr_data, ops.len); | |
594 | if (IS_ERR(ops.datbuf)) | |
595 | return PTR_ERR(ops.datbuf); | |
596 | } else { | |
597 | ops.datbuf = NULL; | |
598 | } | |
599 | ||
600 | if (req.usr_oob) { | |
601 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); | |
602 | if (IS_ERR(ops.oobbuf)) { | |
603 | kfree(ops.datbuf); | |
604 | return PTR_ERR(ops.oobbuf); | |
605 | } | |
606 | } else { | |
607 | ops.oobbuf = NULL; | |
608 | } | |
609 | ||
610 | ret = mtd->write_oob(mtd, (loff_t)req.start, &ops); | |
611 | ||
612 | kfree(ops.datbuf); | |
613 | kfree(ops.oobbuf); | |
614 | ||
615 | return ret; | |
616 | } | |
617 | ||
55929332 | 618 | static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 619 | { |
f1a28c02 TG |
620 | struct mtd_file_info *mfi = file->private_data; |
621 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
622 | void __user *argp = (void __user *)arg; |
623 | int ret = 0; | |
624 | u_long size; | |
73c619ea | 625 | struct mtd_info_user info; |
97894cda | 626 | |
289c0522 | 627 | pr_debug("MTD_ioctl\n"); |
1da177e4 LT |
628 | |
629 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
630 | if (cmd & IOC_IN) { | |
631 | if (!access_ok(VERIFY_READ, argp, size)) | |
632 | return -EFAULT; | |
633 | } | |
634 | if (cmd & IOC_OUT) { | |
635 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
636 | return -EFAULT; | |
637 | } | |
97894cda | 638 | |
1da177e4 LT |
639 | switch (cmd) { |
640 | case MEMGETREGIONCOUNT: | |
641 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
642 | return -EFAULT; | |
643 | break; | |
644 | ||
645 | case MEMGETREGIONINFO: | |
646 | { | |
b67c5f87 ZW |
647 | uint32_t ur_idx; |
648 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 649 | struct region_info_user __user *ur = argp; |
1da177e4 | 650 | |
b67c5f87 | 651 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
652 | return -EFAULT; |
653 | ||
5e59be1f DC |
654 | if (ur_idx >= mtd->numeraseregions) |
655 | return -EINVAL; | |
656 | ||
b67c5f87 ZW |
657 | kr = &(mtd->eraseregions[ur_idx]); |
658 | ||
659 | if (put_user(kr->offset, &(ur->offset)) | |
660 | || put_user(kr->erasesize, &(ur->erasesize)) | |
661 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 662 | return -EFAULT; |
b67c5f87 | 663 | |
1da177e4 LT |
664 | break; |
665 | } | |
666 | ||
667 | case MEMGETINFO: | |
a0c5a394 | 668 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
669 | info.type = mtd->type; |
670 | info.flags = mtd->flags; | |
671 | info.size = mtd->size; | |
672 | info.erasesize = mtd->erasesize; | |
673 | info.writesize = mtd->writesize; | |
674 | info.oobsize = mtd->oobsize; | |
19fb4341 BN |
675 | /* The below field is obsolete */ |
676 | info.padding = 0; | |
73c619ea | 677 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
678 | return -EFAULT; |
679 | break; | |
680 | ||
681 | case MEMERASE: | |
0dc54e9f | 682 | case MEMERASE64: |
1da177e4 LT |
683 | { |
684 | struct erase_info *erase; | |
685 | ||
aeb5d727 | 686 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
687 | return -EPERM; |
688 | ||
95b93a0c | 689 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
690 | if (!erase) |
691 | ret = -ENOMEM; | |
692 | else { | |
693 | wait_queue_head_t waitq; | |
694 | DECLARE_WAITQUEUE(wait, current); | |
695 | ||
696 | init_waitqueue_head(&waitq); | |
697 | ||
0dc54e9f KC |
698 | if (cmd == MEMERASE64) { |
699 | struct erase_info_user64 einfo64; | |
700 | ||
701 | if (copy_from_user(&einfo64, argp, | |
702 | sizeof(struct erase_info_user64))) { | |
703 | kfree(erase); | |
704 | return -EFAULT; | |
705 | } | |
706 | erase->addr = einfo64.start; | |
707 | erase->len = einfo64.length; | |
708 | } else { | |
709 | struct erase_info_user einfo32; | |
710 | ||
711 | if (copy_from_user(&einfo32, argp, | |
712 | sizeof(struct erase_info_user))) { | |
713 | kfree(erase); | |
714 | return -EFAULT; | |
715 | } | |
716 | erase->addr = einfo32.start; | |
717 | erase->len = einfo32.length; | |
1da177e4 LT |
718 | } |
719 | erase->mtd = mtd; | |
720 | erase->callback = mtdchar_erase_callback; | |
721 | erase->priv = (unsigned long)&waitq; | |
97894cda | 722 | |
1da177e4 LT |
723 | /* |
724 | FIXME: Allow INTERRUPTIBLE. Which means | |
725 | not having the wait_queue head on the stack. | |
97894cda | 726 | |
1da177e4 LT |
727 | If the wq_head is on the stack, and we |
728 | leave because we got interrupted, then the | |
729 | wq_head is no longer there when the | |
730 | callback routine tries to wake us up. | |
731 | */ | |
732 | ret = mtd->erase(mtd, erase); | |
733 | if (!ret) { | |
734 | set_current_state(TASK_UNINTERRUPTIBLE); | |
735 | add_wait_queue(&waitq, &wait); | |
736 | if (erase->state != MTD_ERASE_DONE && | |
737 | erase->state != MTD_ERASE_FAILED) | |
738 | schedule(); | |
739 | remove_wait_queue(&waitq, &wait); | |
740 | set_current_state(TASK_RUNNING); | |
741 | ||
742 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
743 | } | |
744 | kfree(erase); | |
745 | } | |
746 | break; | |
747 | } | |
748 | ||
749 | case MEMWRITEOOB: | |
750 | { | |
751 | struct mtd_oob_buf buf; | |
97718540 | 752 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 753 | |
97718540 KC |
754 | /* NOTE: writes return length to buf_user->length */ |
755 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 756 | ret = -EFAULT; |
97718540 KC |
757 | else |
758 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
759 | buf.ptr, &buf_user->length); | |
1da177e4 | 760 | break; |
1da177e4 LT |
761 | } |
762 | ||
763 | case MEMREADOOB: | |
764 | { | |
765 | struct mtd_oob_buf buf; | |
97718540 | 766 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 767 | |
97718540 KC |
768 | /* NOTE: writes return length to buf_user->start */ |
769 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 770 | ret = -EFAULT; |
97718540 | 771 | else |
c46f6483 | 772 | ret = mtd_do_readoob(file, mtd, buf.start, buf.length, |
97718540 | 773 | buf.ptr, &buf_user->start); |
1da177e4 LT |
774 | break; |
775 | } | |
776 | ||
aea7cea9 KC |
777 | case MEMWRITEOOB64: |
778 | { | |
779 | struct mtd_oob_buf64 buf; | |
780 | struct mtd_oob_buf64 __user *buf_user = argp; | |
781 | ||
782 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
783 | ret = -EFAULT; | |
784 | else | |
785 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
786 | (void __user *)(uintptr_t)buf.usr_ptr, | |
787 | &buf_user->length); | |
788 | break; | |
789 | } | |
790 | ||
791 | case MEMREADOOB64: | |
792 | { | |
793 | struct mtd_oob_buf64 buf; | |
794 | struct mtd_oob_buf64 __user *buf_user = argp; | |
795 | ||
796 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
797 | ret = -EFAULT; | |
798 | else | |
c46f6483 | 799 | ret = mtd_do_readoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
800 | (void __user *)(uintptr_t)buf.usr_ptr, |
801 | &buf_user->length); | |
802 | break; | |
803 | } | |
804 | ||
e99d8b08 BN |
805 | case MEMWRITE: |
806 | { | |
807 | ret = mtd_write_ioctl(mtd, | |
808 | (struct mtd_write_req __user *)arg); | |
809 | break; | |
810 | } | |
811 | ||
1da177e4 LT |
812 | case MEMLOCK: |
813 | { | |
175428b2 | 814 | struct erase_info_user einfo; |
1da177e4 | 815 | |
175428b2 | 816 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
817 | return -EFAULT; |
818 | ||
819 | if (!mtd->lock) | |
820 | ret = -EOPNOTSUPP; | |
821 | else | |
175428b2 | 822 | ret = mtd->lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
823 | break; |
824 | } | |
825 | ||
826 | case MEMUNLOCK: | |
827 | { | |
175428b2 | 828 | struct erase_info_user einfo; |
1da177e4 | 829 | |
175428b2 | 830 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
831 | return -EFAULT; |
832 | ||
833 | if (!mtd->unlock) | |
834 | ret = -EOPNOTSUPP; | |
835 | else | |
175428b2 | 836 | ret = mtd->unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
837 | break; |
838 | } | |
839 | ||
9938424f RC |
840 | case MEMISLOCKED: |
841 | { | |
842 | struct erase_info_user einfo; | |
843 | ||
844 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
845 | return -EFAULT; | |
846 | ||
847 | if (!mtd->is_locked) | |
848 | ret = -EOPNOTSUPP; | |
849 | else | |
850 | ret = mtd->is_locked(mtd, einfo.start, einfo.length); | |
851 | break; | |
852 | } | |
853 | ||
5bd34c09 | 854 | /* Legacy interface */ |
1da177e4 LT |
855 | case MEMGETOOBSEL: |
856 | { | |
5bd34c09 TG |
857 | struct nand_oobinfo oi; |
858 | ||
859 | if (!mtd->ecclayout) | |
860 | return -EOPNOTSUPP; | |
861 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
862 | return -EINVAL; | |
863 | ||
864 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
865 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
866 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
867 | sizeof(oi.oobfree)); | |
d25ade71 | 868 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
869 | |
870 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
871 | return -EFAULT; |
872 | break; | |
873 | } | |
874 | ||
875 | case MEMGETBADBLOCK: | |
876 | { | |
877 | loff_t offs; | |
97894cda | 878 | |
1da177e4 LT |
879 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
880 | return -EFAULT; | |
881 | if (!mtd->block_isbad) | |
882 | ret = -EOPNOTSUPP; | |
883 | else | |
884 | return mtd->block_isbad(mtd, offs); | |
885 | break; | |
886 | } | |
887 | ||
888 | case MEMSETBADBLOCK: | |
889 | { | |
890 | loff_t offs; | |
891 | ||
892 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
893 | return -EFAULT; | |
894 | if (!mtd->block_markbad) | |
895 | ret = -EOPNOTSUPP; | |
896 | else | |
897 | return mtd->block_markbad(mtd, offs); | |
898 | break; | |
899 | } | |
900 | ||
34a82443 | 901 | #ifdef CONFIG_HAVE_MTD_OTP |
31f4233b NP |
902 | case OTPSELECT: |
903 | { | |
904 | int mode; | |
905 | if (copy_from_user(&mode, argp, sizeof(int))) | |
906 | return -EFAULT; | |
f1a28c02 | 907 | |
beb133fc | 908 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 TG |
909 | |
910 | ret = otp_select_filemode(mfi, mode); | |
911 | ||
81dba488 | 912 | file->f_pos = 0; |
31f4233b NP |
913 | break; |
914 | } | |
915 | ||
916 | case OTPGETREGIONCOUNT: | |
917 | case OTPGETREGIONINFO: | |
918 | { | |
919 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
920 | if (!buf) | |
921 | return -ENOMEM; | |
922 | ret = -EOPNOTSUPP; | |
f1a28c02 | 923 | switch (mfi->mode) { |
beb133fc | 924 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
925 | if (mtd->get_fact_prot_info) |
926 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
927 | break; | |
beb133fc | 928 | case MTD_FILE_MODE_OTP_USER: |
31f4233b NP |
929 | if (mtd->get_user_prot_info) |
930 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
931 | break; | |
f1a28c02 TG |
932 | default: |
933 | break; | |
31f4233b NP |
934 | } |
935 | if (ret >= 0) { | |
936 | if (cmd == OTPGETREGIONCOUNT) { | |
937 | int nbr = ret / sizeof(struct otp_info); | |
938 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
939 | } else | |
940 | ret = copy_to_user(argp, buf, ret); | |
941 | if (ret) | |
942 | ret = -EFAULT; | |
943 | } | |
944 | kfree(buf); | |
945 | break; | |
946 | } | |
947 | ||
948 | case OTPLOCK: | |
949 | { | |
175428b2 | 950 | struct otp_info oinfo; |
31f4233b | 951 | |
beb133fc | 952 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
31f4233b | 953 | return -EINVAL; |
175428b2 | 954 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b NP |
955 | return -EFAULT; |
956 | if (!mtd->lock_user_prot_reg) | |
957 | return -EOPNOTSUPP; | |
175428b2 | 958 | ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
959 | break; |
960 | } | |
961 | #endif | |
962 | ||
7854d3f7 | 963 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
964 | case ECCGETLAYOUT: |
965 | { | |
cc26c3cd BN |
966 | struct nand_ecclayout_user *usrlay; |
967 | ||
f1a28c02 TG |
968 | if (!mtd->ecclayout) |
969 | return -EOPNOTSUPP; | |
970 | ||
cc26c3cd BN |
971 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
972 | if (!usrlay) | |
973 | return -ENOMEM; | |
974 | ||
975 | shrink_ecclayout(mtd->ecclayout, usrlay); | |
976 | ||
977 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
978 | ret = -EFAULT; | |
979 | kfree(usrlay); | |
f1a28c02 TG |
980 | break; |
981 | } | |
982 | ||
983 | case ECCGETSTATS: | |
984 | { | |
985 | if (copy_to_user(argp, &mtd->ecc_stats, | |
986 | sizeof(struct mtd_ecc_stats))) | |
987 | return -EFAULT; | |
988 | break; | |
989 | } | |
990 | ||
991 | case MTDFILEMODE: | |
992 | { | |
993 | mfi->mode = 0; | |
994 | ||
995 | switch(arg) { | |
beb133fc BN |
996 | case MTD_FILE_MODE_OTP_FACTORY: |
997 | case MTD_FILE_MODE_OTP_USER: | |
f1a28c02 TG |
998 | ret = otp_select_filemode(mfi, arg); |
999 | break; | |
1000 | ||
beb133fc | 1001 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
1002 | if (!mtd->read_oob || !mtd->write_oob) |
1003 | return -EOPNOTSUPP; | |
1004 | mfi->mode = arg; | |
1005 | ||
beb133fc | 1006 | case MTD_FILE_MODE_NORMAL: |
f1a28c02 TG |
1007 | break; |
1008 | default: | |
1009 | ret = -EINVAL; | |
1010 | } | |
1011 | file->f_pos = 0; | |
1012 | break; | |
1013 | } | |
1014 | ||
d0f7959e RT |
1015 | case BLKPG: |
1016 | { | |
1017 | ret = mtd_blkpg_ioctl(mtd, | |
1018 | (struct blkpg_ioctl_arg __user *)arg); | |
1019 | break; | |
1020 | } | |
1021 | ||
1022 | case BLKRRPART: | |
1023 | { | |
1024 | /* No reread partition feature. Just return ok */ | |
1025 | ret = 0; | |
1026 | break; | |
1027 | } | |
d0f7959e | 1028 | |
1da177e4 LT |
1029 | default: |
1030 | ret = -ENOTTY; | |
1031 | } | |
1032 | ||
1033 | return ret; | |
1034 | } /* memory_ioctl */ | |
1035 | ||
55929332 AB |
1036 | static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
1037 | { | |
1038 | int ret; | |
1039 | ||
5aa82940 | 1040 | mutex_lock(&mtd_mutex); |
55929332 | 1041 | ret = mtd_ioctl(file, cmd, arg); |
5aa82940 | 1042 | mutex_unlock(&mtd_mutex); |
55929332 AB |
1043 | |
1044 | return ret; | |
1045 | } | |
1046 | ||
97718540 KC |
1047 | #ifdef CONFIG_COMPAT |
1048 | ||
1049 | struct mtd_oob_buf32 { | |
1050 | u_int32_t start; | |
1051 | u_int32_t length; | |
1052 | compat_caddr_t ptr; /* unsigned char* */ | |
1053 | }; | |
1054 | ||
1055 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
1056 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
1057 | ||
1058 | static long mtd_compat_ioctl(struct file *file, unsigned int cmd, | |
1059 | unsigned long arg) | |
1060 | { | |
1061 | struct mtd_file_info *mfi = file->private_data; | |
1062 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 1063 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1064 | int ret = 0; |
1065 | ||
5aa82940 | 1066 | mutex_lock(&mtd_mutex); |
97718540 KC |
1067 | |
1068 | switch (cmd) { | |
1069 | case MEMWRITEOOB32: | |
1070 | { | |
1071 | struct mtd_oob_buf32 buf; | |
1072 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1073 | ||
1074 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1075 | ret = -EFAULT; | |
1076 | else | |
1077 | ret = mtd_do_writeoob(file, mtd, buf.start, | |
1078 | buf.length, compat_ptr(buf.ptr), | |
1079 | &buf_user->length); | |
1080 | break; | |
1081 | } | |
1082 | ||
1083 | case MEMREADOOB32: | |
1084 | { | |
1085 | struct mtd_oob_buf32 buf; | |
1086 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1087 | ||
1088 | /* NOTE: writes return length to buf->start */ | |
1089 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1090 | ret = -EFAULT; | |
1091 | else | |
c46f6483 | 1092 | ret = mtd_do_readoob(file, mtd, buf.start, |
97718540 KC |
1093 | buf.length, compat_ptr(buf.ptr), |
1094 | &buf_user->start); | |
1095 | break; | |
1096 | } | |
1097 | default: | |
55929332 | 1098 | ret = mtd_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1099 | } |
1100 | ||
5aa82940 | 1101 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1102 | |
1103 | return ret; | |
1104 | } | |
1105 | ||
1106 | #endif /* CONFIG_COMPAT */ | |
1107 | ||
402d3265 DH |
1108 | /* |
1109 | * try to determine where a shared mapping can be made | |
1110 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1111 | * mappings) | |
1112 | */ | |
1113 | #ifndef CONFIG_MMU | |
1114 | static unsigned long mtd_get_unmapped_area(struct file *file, | |
1115 | unsigned long addr, | |
1116 | unsigned long len, | |
1117 | unsigned long pgoff, | |
1118 | unsigned long flags) | |
1119 | { | |
1120 | struct mtd_file_info *mfi = file->private_data; | |
1121 | struct mtd_info *mtd = mfi->mtd; | |
1122 | ||
1123 | if (mtd->get_unmapped_area) { | |
1124 | unsigned long offset; | |
1125 | ||
1126 | if (addr != 0) | |
1127 | return (unsigned long) -EINVAL; | |
1128 | ||
1129 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) | |
1130 | return (unsigned long) -EINVAL; | |
1131 | ||
1132 | offset = pgoff << PAGE_SHIFT; | |
1133 | if (offset > mtd->size - len) | |
1134 | return (unsigned long) -EINVAL; | |
1135 | ||
1136 | return mtd->get_unmapped_area(mtd, len, offset, flags); | |
1137 | } | |
1138 | ||
1139 | /* can't map directly */ | |
1140 | return (unsigned long) -ENOSYS; | |
1141 | } | |
1142 | #endif | |
1143 | ||
1144 | /* | |
1145 | * set up a mapping for shared memory segments | |
1146 | */ | |
1147 | static int mtd_mmap(struct file *file, struct vm_area_struct *vma) | |
1148 | { | |
1149 | #ifdef CONFIG_MMU | |
1150 | struct mtd_file_info *mfi = file->private_data; | |
1151 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d AG |
1152 | struct map_info *map = mtd->priv; |
1153 | unsigned long start; | |
1154 | unsigned long off; | |
1155 | u32 len; | |
1156 | ||
1157 | if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) { | |
1158 | off = vma->vm_pgoff << PAGE_SHIFT; | |
1159 | start = map->phys; | |
1160 | len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size); | |
1161 | start &= PAGE_MASK; | |
1162 | if ((vma->vm_end - vma->vm_start + off) > len) | |
1163 | return -EINVAL; | |
1164 | ||
1165 | off += start; | |
1166 | vma->vm_pgoff = off >> PAGE_SHIFT; | |
1167 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
1168 | ||
1169 | #ifdef pgprot_noncached | |
1170 | if (file->f_flags & O_DSYNC || off >= __pa(high_memory)) | |
1171 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1172 | #endif | |
1173 | if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, | |
1174 | vma->vm_end - vma->vm_start, | |
1175 | vma->vm_page_prot)) | |
1176 | return -EAGAIN; | |
402d3265 | 1177 | |
402d3265 | 1178 | return 0; |
dd02b67d | 1179 | } |
402d3265 DH |
1180 | return -ENOSYS; |
1181 | #else | |
1182 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; | |
1183 | #endif | |
1184 | } | |
1185 | ||
d54b1fdb | 1186 | static const struct file_operations mtd_fops = { |
1da177e4 LT |
1187 | .owner = THIS_MODULE, |
1188 | .llseek = mtd_lseek, | |
1189 | .read = mtd_read, | |
1190 | .write = mtd_write, | |
55929332 | 1191 | .unlocked_ioctl = mtd_unlocked_ioctl, |
97718540 KC |
1192 | #ifdef CONFIG_COMPAT |
1193 | .compat_ioctl = mtd_compat_ioctl, | |
1194 | #endif | |
1da177e4 LT |
1195 | .open = mtd_open, |
1196 | .release = mtd_close, | |
402d3265 DH |
1197 | .mmap = mtd_mmap, |
1198 | #ifndef CONFIG_MMU | |
1199 | .get_unmapped_area = mtd_get_unmapped_area, | |
1200 | #endif | |
1da177e4 LT |
1201 | }; |
1202 | ||
51139ada AV |
1203 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
1204 | int flags, const char *dev_name, void *data) | |
cd874237 | 1205 | { |
c74a1cbb | 1206 | return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC); |
cd874237 KS |
1207 | } |
1208 | ||
1209 | static struct file_system_type mtd_inodefs_type = { | |
1210 | .name = "mtd_inodefs", | |
51139ada | 1211 | .mount = mtd_inodefs_mount, |
cd874237 KS |
1212 | .kill_sb = kill_anon_super, |
1213 | }; | |
1214 | ||
1215 | static void mtdchar_notify_add(struct mtd_info *mtd) | |
1216 | { | |
1217 | } | |
1218 | ||
1219 | static void mtdchar_notify_remove(struct mtd_info *mtd) | |
1220 | { | |
1221 | struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index); | |
1222 | ||
1223 | if (mtd_ino) { | |
1224 | /* Destroy the inode if it exists */ | |
1225 | mtd_ino->i_nlink = 0; | |
1226 | iput(mtd_ino); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | static struct mtd_notifier mtdchar_notifier = { | |
1231 | .add = mtdchar_notify_add, | |
1232 | .remove = mtdchar_notify_remove, | |
1233 | }; | |
1234 | ||
1da177e4 LT |
1235 | static int __init init_mtdchar(void) |
1236 | { | |
cd874237 | 1237 | int ret; |
1f24b5a8 | 1238 | |
cd874237 | 1239 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1240 | "mtd", &mtd_fops); |
cd874237 KS |
1241 | if (ret < 0) { |
1242 | pr_notice("Can't allocate major number %d for " | |
1243 | "Memory Technology Devices.\n", MTD_CHAR_MAJOR); | |
1244 | return ret; | |
9bc7b387 TP |
1245 | } |
1246 | ||
cd874237 KS |
1247 | ret = register_filesystem(&mtd_inodefs_type); |
1248 | if (ret) { | |
1249 | pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret); | |
1250 | goto err_unregister_chdev; | |
1251 | } | |
1252 | ||
1253 | mtd_inode_mnt = kern_mount(&mtd_inodefs_type); | |
1254 | if (IS_ERR(mtd_inode_mnt)) { | |
1255 | ret = PTR_ERR(mtd_inode_mnt); | |
1256 | pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret); | |
1257 | goto err_unregister_filesystem; | |
1258 | } | |
1259 | register_mtd_user(&mtdchar_notifier); | |
1260 | ||
1261 | return ret; | |
1262 | ||
1263 | err_unregister_filesystem: | |
1264 | unregister_filesystem(&mtd_inodefs_type); | |
1265 | err_unregister_chdev: | |
1266 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); | |
1267 | return ret; | |
1da177e4 LT |
1268 | } |
1269 | ||
1270 | static void __exit cleanup_mtdchar(void) | |
1271 | { | |
cd874237 | 1272 | unregister_mtd_user(&mtdchar_notifier); |
423e0ab0 | 1273 | kern_unmount(mtd_inode_mnt); |
cd874237 | 1274 | unregister_filesystem(&mtd_inodefs_type); |
dad0db31 | 1275 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1276 | } |
1277 | ||
1278 | module_init(init_mtdchar); | |
1279 | module_exit(cleanup_mtdchar); | |
1280 | ||
1f24b5a8 | 1281 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |
1da177e4 LT |
1282 | |
1283 | MODULE_LICENSE("GPL"); | |
1284 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1285 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); | |
90160e13 | 1286 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |