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Commit | Line | Data |
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fd534e9b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
a1452a37 | 3 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
1da177e4 LT |
4 | */ |
5 | ||
15fdc52f TG |
6 | #include <linux/device.h> |
7 | #include <linux/fs.h> | |
0c1eafdb | 8 | #include <linux/mm.h> |
9c74034f | 9 | #include <linux/err.h> |
15fdc52f | 10 | #include <linux/init.h> |
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> | |
15fdc52f TG |
13 | #include <linux/slab.h> |
14 | #include <linux/sched.h> | |
5aa82940 | 15 | #include <linux/mutex.h> |
402d3265 | 16 | #include <linux/backing-dev.h> |
97718540 | 17 | #include <linux/compat.h> |
cd874237 | 18 | #include <linux/mount.h> |
d0f7959e | 19 | #include <linux/blkpg.h> |
b502bd11 | 20 | #include <linux/magic.h> |
f83c3838 | 21 | #include <linux/major.h> |
1da177e4 | 22 | #include <linux/mtd/mtd.h> |
d0f7959e | 23 | #include <linux/mtd/partitions.h> |
dd02b67d | 24 | #include <linux/mtd/map.h> |
1da177e4 | 25 | |
7c0f6ba6 | 26 | #include <linux/uaccess.h> |
9bc7b387 | 27 | |
660685d9 AB |
28 | #include "mtdcore.h" |
29 | ||
5aa82940 | 30 | static DEFINE_MUTEX(mtd_mutex); |
1da177e4 | 31 | |
045e9a5d | 32 | /* |
f1a28c02 | 33 | * Data structure to hold the pointer to the mtd device as well |
92394b5c | 34 | * as mode information of various use cases. |
045e9a5d | 35 | */ |
f1a28c02 TG |
36 | struct mtd_file_info { |
37 | struct mtd_info *mtd; | |
38 | enum mtd_file_modes mode; | |
39 | }; | |
31f4233b | 40 | |
969e57ad | 41 | static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 | 42 | { |
f1a28c02 | 43 | struct mtd_file_info *mfi = file->private_data; |
b959957f | 44 | return fixed_size_llseek(file, offset, orig, mfi->mtd->size); |
1da177e4 LT |
45 | } |
46 | ||
969e57ad | 47 | static int mtdchar_open(struct inode *inode, struct file *file) |
1da177e4 LT |
48 | { |
49 | int minor = iminor(inode); | |
50 | int devnum = minor >> 1; | |
6071239e | 51 | int ret = 0; |
1da177e4 | 52 | struct mtd_info *mtd; |
f1a28c02 | 53 | struct mtd_file_info *mfi; |
1da177e4 | 54 | |
289c0522 | 55 | pr_debug("MTD_open\n"); |
1da177e4 | 56 | |
1da177e4 | 57 | /* You can't open the RO devices RW */ |
aeb5d727 | 58 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
1da177e4 LT |
59 | return -EACCES; |
60 | ||
5aa82940 | 61 | mutex_lock(&mtd_mutex); |
1da177e4 | 62 | mtd = get_mtd_device(NULL, devnum); |
97894cda | 63 | |
6071239e JC |
64 | if (IS_ERR(mtd)) { |
65 | ret = PTR_ERR(mtd); | |
66 | goto out; | |
67 | } | |
97894cda | 68 | |
402d3265 | 69 | if (mtd->type == MTD_ABSENT) { |
6071239e | 70 | ret = -ENODEV; |
c65390f4 | 71 | goto out1; |
1da177e4 LT |
72 | } |
73 | ||
1da177e4 | 74 | /* You can't open it RW if it's not a writeable device */ |
aeb5d727 | 75 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
6071239e | 76 | ret = -EACCES; |
b4caecd4 | 77 | goto out1; |
1da177e4 | 78 | } |
97894cda | 79 | |
f1a28c02 TG |
80 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
81 | if (!mfi) { | |
6071239e | 82 | ret = -ENOMEM; |
b4caecd4 | 83 | goto out1; |
f1a28c02 TG |
84 | } |
85 | mfi->mtd = mtd; | |
86 | file->private_data = mfi; | |
c65390f4 AV |
87 | mutex_unlock(&mtd_mutex); |
88 | return 0; | |
f1a28c02 | 89 | |
c65390f4 AV |
90 | out1: |
91 | put_mtd_device(mtd); | |
6071239e | 92 | out: |
5aa82940 | 93 | mutex_unlock(&mtd_mutex); |
6071239e | 94 | return ret; |
969e57ad | 95 | } /* mtdchar_open */ |
1da177e4 LT |
96 | |
97 | /*====================================================================*/ | |
98 | ||
969e57ad | 99 | static int mtdchar_close(struct inode *inode, struct file *file) |
1da177e4 | 100 | { |
f1a28c02 TG |
101 | struct mtd_file_info *mfi = file->private_data; |
102 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 | 103 | |
289c0522 | 104 | pr_debug("MTD_close\n"); |
1da177e4 | 105 | |
7eafaed5 | 106 | /* Only sync if opened RW */ |
327cf292 | 107 | if ((file->f_mode & FMODE_WRITE)) |
85f2f2a8 | 108 | mtd_sync(mtd); |
97894cda | 109 | |
1da177e4 | 110 | put_mtd_device(mtd); |
f1a28c02 TG |
111 | file->private_data = NULL; |
112 | kfree(mfi); | |
1da177e4 LT |
113 | |
114 | return 0; | |
969e57ad | 115 | } /* mtdchar_close */ |
1da177e4 | 116 | |
3e45cf5e GE |
117 | /* Back in June 2001, dwmw2 wrote: |
118 | * | |
119 | * FIXME: This _really_ needs to die. In 2.5, we should lock the | |
120 | * userspace buffer down and use it directly with readv/writev. | |
121 | * | |
122 | * The implementation below, using mtd_kmalloc_up_to, mitigates | |
123 | * allocation failures when the system is under low-memory situations | |
124 | * or if memory is highly fragmented at the cost of reducing the | |
125 | * performance of the requested transfer due to a smaller buffer size. | |
126 | * | |
127 | * A more complex but more memory-efficient implementation based on | |
128 | * get_user_pages and iovecs to cover extents of those pages is a | |
129 | * longer-term goal, as intimated by dwmw2 above. However, for the | |
130 | * write case, this requires yet more complex head and tail transfer | |
131 | * handling when those head and tail offsets and sizes are such that | |
132 | * alignment requirements are not met in the NAND subdriver. | |
133 | */ | |
1da177e4 | 134 | |
969e57ad AB |
135 | static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
136 | loff_t *ppos) | |
1da177e4 | 137 | { |
f1a28c02 TG |
138 | struct mtd_file_info *mfi = file->private_data; |
139 | struct mtd_info *mtd = mfi->mtd; | |
30fa9848 | 140 | size_t retlen; |
1da177e4 LT |
141 | size_t total_retlen=0; |
142 | int ret=0; | |
143 | int len; | |
3e45cf5e | 144 | size_t size = count; |
1da177e4 | 145 | char *kbuf; |
97894cda | 146 | |
289c0522 | 147 | pr_debug("MTD_read\n"); |
1da177e4 | 148 | |
6c6bc9ea JH |
149 | if (*ppos + count > mtd->size) { |
150 | if (*ppos < mtd->size) | |
151 | count = mtd->size - *ppos; | |
152 | else | |
153 | count = 0; | |
154 | } | |
1da177e4 LT |
155 | |
156 | if (!count) | |
157 | return 0; | |
97894cda | 158 | |
3e45cf5e | 159 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
160 | if (!kbuf) |
161 | return -ENOMEM; | |
162 | ||
1da177e4 | 163 | while (count) { |
3e45cf5e | 164 | len = min_t(size_t, count, size); |
1da177e4 | 165 | |
f1a28c02 | 166 | switch (mfi->mode) { |
beb133fc | 167 | case MTD_FILE_MODE_OTP_FACTORY: |
d264f72a AB |
168 | ret = mtd_read_fact_prot_reg(mtd, *ppos, len, |
169 | &retlen, kbuf); | |
31f4233b | 170 | break; |
beb133fc | 171 | case MTD_FILE_MODE_OTP_USER: |
4ea1cabb AB |
172 | ret = mtd_read_user_prot_reg(mtd, *ppos, len, |
173 | &retlen, kbuf); | |
31f4233b | 174 | break; |
beb133fc | 175 | case MTD_FILE_MODE_RAW: |
f1a28c02 | 176 | { |
717bc8a6 | 177 | struct mtd_oob_ops ops = {}; |
f1a28c02 | 178 | |
0612b9dd | 179 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
180 | ops.datbuf = kbuf; |
181 | ops.oobbuf = NULL; | |
182 | ops.len = len; | |
183 | ||
fd2819bb | 184 | ret = mtd_read_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
185 | retlen = ops.retlen; |
186 | break; | |
187 | } | |
31f4233b | 188 | default: |
329ad399 | 189 | ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 190 | } |
7854d3f7 | 191 | /* Nand returns -EBADMSG on ECC errors, but it returns |
1da177e4 | 192 | * the data. For our userspace tools it is important |
7854d3f7 | 193 | * to dump areas with ECC errors! |
9a1fcdfd | 194 | * For kernel internal usage it also might return -EUCLEAN |
25985edc | 195 | * to signal the caller that a bitflip has occurred and has |
9a1fcdfd | 196 | * been corrected by the ECC algorithm. |
1da177e4 LT |
197 | * Userspace software which accesses NAND this way |
198 | * must be aware of the fact that it deals with NAND | |
199 | */ | |
d57f4054 | 200 | if (!ret || mtd_is_bitflip_or_eccerr(ret)) { |
1da177e4 LT |
201 | *ppos += retlen; |
202 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 203 | kfree(kbuf); |
1da177e4 LT |
204 | return -EFAULT; |
205 | } | |
206 | else | |
207 | total_retlen += retlen; | |
208 | ||
209 | count -= retlen; | |
210 | buf += retlen; | |
31f4233b NP |
211 | if (retlen == 0) |
212 | count = 0; | |
1da177e4 LT |
213 | } |
214 | else { | |
215 | kfree(kbuf); | |
216 | return ret; | |
217 | } | |
97894cda | 218 | |
1da177e4 LT |
219 | } |
220 | ||
b802c074 | 221 | kfree(kbuf); |
1da177e4 | 222 | return total_retlen; |
969e57ad | 223 | } /* mtdchar_read */ |
1da177e4 | 224 | |
969e57ad AB |
225 | static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
226 | loff_t *ppos) | |
1da177e4 | 227 | { |
f1a28c02 TG |
228 | struct mtd_file_info *mfi = file->private_data; |
229 | struct mtd_info *mtd = mfi->mtd; | |
3e45cf5e | 230 | size_t size = count; |
1da177e4 LT |
231 | char *kbuf; |
232 | size_t retlen; | |
233 | size_t total_retlen=0; | |
234 | int ret=0; | |
235 | int len; | |
236 | ||
289c0522 | 237 | pr_debug("MTD_write\n"); |
97894cda | 238 | |
6c6bc9ea | 239 | if (*ppos >= mtd->size) |
1da177e4 | 240 | return -ENOSPC; |
97894cda | 241 | |
1da177e4 LT |
242 | if (*ppos + count > mtd->size) |
243 | count = mtd->size - *ppos; | |
244 | ||
245 | if (!count) | |
246 | return 0; | |
247 | ||
3e45cf5e | 248 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
249 | if (!kbuf) |
250 | return -ENOMEM; | |
251 | ||
1da177e4 | 252 | while (count) { |
3e45cf5e | 253 | len = min_t(size_t, count, size); |
1da177e4 | 254 | |
1da177e4 LT |
255 | if (copy_from_user(kbuf, buf, len)) { |
256 | kfree(kbuf); | |
257 | return -EFAULT; | |
258 | } | |
97894cda | 259 | |
f1a28c02 | 260 | switch (mfi->mode) { |
beb133fc | 261 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
262 | ret = -EROFS; |
263 | break; | |
beb133fc | 264 | case MTD_FILE_MODE_OTP_USER: |
482b43ad AB |
265 | ret = mtd_write_user_prot_reg(mtd, *ppos, len, |
266 | &retlen, kbuf); | |
31f4233b | 267 | break; |
f1a28c02 | 268 | |
beb133fc | 269 | case MTD_FILE_MODE_RAW: |
f1a28c02 | 270 | { |
717bc8a6 | 271 | struct mtd_oob_ops ops = {}; |
f1a28c02 | 272 | |
0612b9dd | 273 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
274 | ops.datbuf = kbuf; |
275 | ops.oobbuf = NULL; | |
bf514081 | 276 | ops.ooboffs = 0; |
f1a28c02 TG |
277 | ops.len = len; |
278 | ||
a2cc5ba0 | 279 | ret = mtd_write_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
280 | retlen = ops.retlen; |
281 | break; | |
282 | } | |
283 | ||
31f4233b | 284 | default: |
eda95cbf | 285 | ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 286 | } |
9a78bc83 CR |
287 | |
288 | /* | |
289 | * Return -ENOSPC only if no data could be written at all. | |
290 | * Otherwise just return the number of bytes that actually | |
291 | * have been written. | |
292 | */ | |
293 | if ((ret == -ENOSPC) && (total_retlen)) | |
294 | break; | |
295 | ||
1da177e4 LT |
296 | if (!ret) { |
297 | *ppos += retlen; | |
298 | total_retlen += retlen; | |
299 | count -= retlen; | |
300 | buf += retlen; | |
301 | } | |
302 | else { | |
303 | kfree(kbuf); | |
304 | return ret; | |
305 | } | |
1da177e4 LT |
306 | } |
307 | ||
b802c074 | 308 | kfree(kbuf); |
1da177e4 | 309 | return total_retlen; |
969e57ad | 310 | } /* mtdchar_write */ |
1da177e4 LT |
311 | |
312 | /*====================================================================== | |
313 | ||
314 | IOCTL calls for getting device parameters. | |
315 | ||
316 | ======================================================================*/ | |
1da177e4 | 317 | |
f1a28c02 TG |
318 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
319 | { | |
320 | struct mtd_info *mtd = mfi->mtd; | |
b6de3d6c | 321 | size_t retlen; |
b6de3d6c | 322 | |
f1a28c02 TG |
323 | switch (mode) { |
324 | case MTD_OTP_FACTORY: | |
5dc63fa2 UKK |
325 | if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == |
326 | -EOPNOTSUPP) | |
327 | return -EOPNOTSUPP; | |
328 | ||
b6de3d6c | 329 | mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
f1a28c02 TG |
330 | break; |
331 | case MTD_OTP_USER: | |
5dc63fa2 UKK |
332 | if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == |
333 | -EOPNOTSUPP) | |
334 | return -EOPNOTSUPP; | |
335 | ||
b6de3d6c | 336 | mfi->mode = MTD_FILE_MODE_OTP_USER; |
f1a28c02 | 337 | break; |
f1a28c02 | 338 | case MTD_OTP_OFF: |
5dc63fa2 | 339 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 | 340 | break; |
5dc63fa2 UKK |
341 | default: |
342 | return -EINVAL; | |
f1a28c02 | 343 | } |
5dc63fa2 UKK |
344 | |
345 | return 0; | |
f1a28c02 | 346 | } |
f1a28c02 | 347 | |
969e57ad | 348 | static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, |
97718540 KC |
349 | uint64_t start, uint32_t length, void __user *ptr, |
350 | uint32_t __user *retp) | |
351 | { | |
46b5889c | 352 | struct mtd_info *master = mtd_get_master(mtd); |
9ce244b3 | 353 | struct mtd_file_info *mfi = file->private_data; |
717bc8a6 | 354 | struct mtd_oob_ops ops = {}; |
97718540 KC |
355 | uint32_t retlen; |
356 | int ret = 0; | |
357 | ||
97718540 KC |
358 | if (length > 4096) |
359 | return -EINVAL; | |
360 | ||
46b5889c | 361 | if (!master->_write_oob) |
0db188f9 | 362 | return -EOPNOTSUPP; |
97718540 KC |
363 | |
364 | ops.ooblen = length; | |
305b93f1 | 365 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 366 | ops.datbuf = NULL; |
beb133fc | 367 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 368 | MTD_OPS_PLACE_OOB; |
97718540 KC |
369 | |
370 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
371 | return -EINVAL; | |
372 | ||
df1f1d1c JL |
373 | ops.oobbuf = memdup_user(ptr, length); |
374 | if (IS_ERR(ops.oobbuf)) | |
375 | return PTR_ERR(ops.oobbuf); | |
97718540 | 376 | |
305b93f1 | 377 | start &= ~((uint64_t)mtd->writesize - 1); |
a2cc5ba0 | 378 | ret = mtd_write_oob(mtd, start, &ops); |
97718540 KC |
379 | |
380 | if (ops.oobretlen > 0xFFFFFFFFU) | |
381 | ret = -EOVERFLOW; | |
382 | retlen = ops.oobretlen; | |
383 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
384 | ret = -EFAULT; | |
385 | ||
386 | kfree(ops.oobbuf); | |
387 | return ret; | |
388 | } | |
389 | ||
969e57ad | 390 | static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
c46f6483 BN |
391 | uint64_t start, uint32_t length, void __user *ptr, |
392 | uint32_t __user *retp) | |
97718540 | 393 | { |
c46f6483 | 394 | struct mtd_file_info *mfi = file->private_data; |
717bc8a6 | 395 | struct mtd_oob_ops ops = {}; |
97718540 KC |
396 | int ret = 0; |
397 | ||
398 | if (length > 4096) | |
399 | return -EINVAL; | |
400 | ||
97718540 | 401 | ops.ooblen = length; |
305b93f1 | 402 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 403 | ops.datbuf = NULL; |
beb133fc | 404 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 405 | MTD_OPS_PLACE_OOB; |
97718540 KC |
406 | |
407 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
408 | return -EINVAL; | |
409 | ||
410 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
411 | if (!ops.oobbuf) | |
412 | return -ENOMEM; | |
413 | ||
305b93f1 | 414 | start &= ~((uint64_t)mtd->writesize - 1); |
fd2819bb | 415 | ret = mtd_read_oob(mtd, start, &ops); |
97718540 KC |
416 | |
417 | if (put_user(ops.oobretlen, retp)) | |
418 | ret = -EFAULT; | |
419 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
420 | ops.oobretlen)) | |
421 | ret = -EFAULT; | |
422 | ||
423 | kfree(ops.oobbuf); | |
041e4575 BN |
424 | |
425 | /* | |
426 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
427 | * data. For our userspace tools it is important to dump areas | |
428 | * with ECC errors! | |
429 | * For kernel internal usage it also might return -EUCLEAN | |
5d708ecc | 430 | * to signal the caller that a bitflip has occurred and has |
041e4575 BN |
431 | * been corrected by the ECC algorithm. |
432 | * | |
c478d7e4 BN |
433 | * Note: currently the standard NAND function, nand_read_oob_std, |
434 | * does not calculate ECC for the OOB area, so do not rely on | |
435 | * this behavior unless you have replaced it with your own. | |
041e4575 | 436 | */ |
d57f4054 | 437 | if (mtd_is_bitflip_or_eccerr(ret)) |
041e4575 BN |
438 | return 0; |
439 | ||
97718540 KC |
440 | return ret; |
441 | } | |
442 | ||
cc26c3cd | 443 | /* |
aab616e3 BB |
444 | * Copies (and truncates, if necessary) OOB layout information to the |
445 | * deprecated layout struct, nand_ecclayout_user. This is necessary only to | |
446 | * support the deprecated API ioctl ECCGETLAYOUT while allowing all new | |
447 | * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops | |
448 | * can describe any kind of OOB layout with almost zero overhead from a | |
449 | * memory usage point of view). | |
cc26c3cd | 450 | */ |
c2b78452 BB |
451 | static int shrink_ecclayout(struct mtd_info *mtd, |
452 | struct nand_ecclayout_user *to) | |
cc26c3cd | 453 | { |
c2b78452 BB |
454 | struct mtd_oob_region oobregion; |
455 | int i, section = 0, ret; | |
cc26c3cd | 456 | |
c2b78452 | 457 | if (!mtd || !to) |
cc26c3cd BN |
458 | return -EINVAL; |
459 | ||
460 | memset(to, 0, sizeof(*to)); | |
461 | ||
c2b78452 BB |
462 | to->eccbytes = 0; |
463 | for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) { | |
464 | u32 eccpos; | |
465 | ||
6de56493 | 466 | ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
c2b78452 BB |
467 | if (ret < 0) { |
468 | if (ret != -ERANGE) | |
469 | return ret; | |
470 | ||
471 | break; | |
472 | } | |
473 | ||
474 | eccpos = oobregion.offset; | |
475 | for (; i < MTD_MAX_ECCPOS_ENTRIES && | |
476 | eccpos < oobregion.offset + oobregion.length; i++) { | |
477 | to->eccpos[i] = eccpos++; | |
478 | to->eccbytes++; | |
479 | } | |
480 | } | |
cc26c3cd BN |
481 | |
482 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
c2b78452 BB |
483 | ret = mtd_ooblayout_free(mtd, i, &oobregion); |
484 | if (ret < 0) { | |
485 | if (ret != -ERANGE) | |
486 | return ret; | |
487 | ||
488 | break; | |
489 | } | |
490 | ||
491 | to->oobfree[i].offset = oobregion.offset; | |
492 | to->oobfree[i].length = oobregion.length; | |
493 | to->oobavail += to->oobfree[i].length; | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to) | |
500 | { | |
501 | struct mtd_oob_region oobregion; | |
502 | int i, section = 0, ret; | |
503 | ||
504 | if (!mtd || !to) | |
505 | return -EINVAL; | |
506 | ||
507 | memset(to, 0, sizeof(*to)); | |
508 | ||
509 | to->eccbytes = 0; | |
510 | for (i = 0; i < ARRAY_SIZE(to->eccpos);) { | |
511 | u32 eccpos; | |
512 | ||
6de56493 | 513 | ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
c2b78452 BB |
514 | if (ret < 0) { |
515 | if (ret != -ERANGE) | |
516 | return ret; | |
517 | ||
cc26c3cd | 518 | break; |
c2b78452 BB |
519 | } |
520 | ||
521 | if (oobregion.length + i > ARRAY_SIZE(to->eccpos)) | |
522 | return -EINVAL; | |
523 | ||
524 | eccpos = oobregion.offset; | |
525 | for (; eccpos < oobregion.offset + oobregion.length; i++) { | |
526 | to->eccpos[i] = eccpos++; | |
527 | to->eccbytes++; | |
528 | } | |
cc26c3cd BN |
529 | } |
530 | ||
c2b78452 BB |
531 | for (i = 0; i < 8; i++) { |
532 | ret = mtd_ooblayout_free(mtd, i, &oobregion); | |
533 | if (ret < 0) { | |
534 | if (ret != -ERANGE) | |
535 | return ret; | |
536 | ||
537 | break; | |
538 | } | |
539 | ||
540 | to->oobfree[i][0] = oobregion.offset; | |
541 | to->oobfree[i][1] = oobregion.length; | |
542 | } | |
543 | ||
544 | to->useecc = MTD_NANDECC_AUTOPLACE; | |
545 | ||
cc26c3cd BN |
546 | return 0; |
547 | } | |
548 | ||
969e57ad | 549 | static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
53bb724f | 550 | struct blkpg_ioctl_arg *arg) |
d0f7959e | 551 | { |
d0f7959e RT |
552 | struct blkpg_partition p; |
553 | ||
554 | if (!capable(CAP_SYS_ADMIN)) | |
555 | return -EPERM; | |
556 | ||
53bb724f | 557 | if (copy_from_user(&p, arg->data, sizeof(p))) |
d0f7959e RT |
558 | return -EFAULT; |
559 | ||
53bb724f | 560 | switch (arg->op) { |
d0f7959e RT |
561 | case BLKPG_ADD_PARTITION: |
562 | ||
a7e93dcd RT |
563 | /* Only master mtd device must be used to add partitions */ |
564 | if (mtd_is_partition(mtd)) | |
565 | return -EINVAL; | |
566 | ||
1cc8d841 BN |
567 | /* Sanitize user input */ |
568 | p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; | |
569 | ||
d0f7959e RT |
570 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
571 | ||
572 | case BLKPG_DEL_PARTITION: | |
573 | ||
574 | if (p.pno < 0) | |
575 | return -EINVAL; | |
576 | ||
577 | return mtd_del_partition(mtd, p.pno); | |
578 | ||
579 | default: | |
580 | return -EINVAL; | |
581 | } | |
582 | } | |
d0f7959e | 583 | |
969e57ad | 584 | static int mtdchar_write_ioctl(struct mtd_info *mtd, |
e99d8b08 BN |
585 | struct mtd_write_req __user *argp) |
586 | { | |
46b5889c | 587 | struct mtd_info *master = mtd_get_master(mtd); |
e99d8b08 | 588 | struct mtd_write_req req; |
717bc8a6 | 589 | struct mtd_oob_ops ops = {}; |
f62cde49 | 590 | const void __user *usr_data, *usr_oob; |
e99d8b08 BN |
591 | int ret; |
592 | ||
f62cde49 | 593 | if (copy_from_user(&req, argp, sizeof(req))) |
e99d8b08 | 594 | return -EFAULT; |
f62cde49 GU |
595 | |
596 | usr_data = (const void __user *)(uintptr_t)req.usr_data; | |
597 | usr_oob = (const void __user *)(uintptr_t)req.usr_oob; | |
f62cde49 | 598 | |
46b5889c | 599 | if (!master->_write_oob) |
e99d8b08 | 600 | return -EOPNOTSUPP; |
e99d8b08 BN |
601 | ops.mode = req.mode; |
602 | ops.len = (size_t)req.len; | |
603 | ops.ooblen = (size_t)req.ooblen; | |
604 | ops.ooboffs = 0; | |
605 | ||
f62cde49 | 606 | if (usr_data) { |
e99d8b08 BN |
607 | ops.datbuf = memdup_user(usr_data, ops.len); |
608 | if (IS_ERR(ops.datbuf)) | |
609 | return PTR_ERR(ops.datbuf); | |
610 | } else { | |
611 | ops.datbuf = NULL; | |
612 | } | |
613 | ||
f62cde49 | 614 | if (usr_oob) { |
e99d8b08 BN |
615 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); |
616 | if (IS_ERR(ops.oobbuf)) { | |
617 | kfree(ops.datbuf); | |
618 | return PTR_ERR(ops.oobbuf); | |
619 | } | |
620 | } else { | |
621 | ops.oobbuf = NULL; | |
622 | } | |
623 | ||
a2cc5ba0 | 624 | ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
e99d8b08 BN |
625 | |
626 | kfree(ops.datbuf); | |
627 | kfree(ops.oobbuf); | |
628 | ||
629 | return ret; | |
630 | } | |
631 | ||
969e57ad | 632 | static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 633 | { |
f1a28c02 TG |
634 | struct mtd_file_info *mfi = file->private_data; |
635 | struct mtd_info *mtd = mfi->mtd; | |
46b5889c | 636 | struct mtd_info *master = mtd_get_master(mtd); |
1da177e4 LT |
637 | void __user *argp = (void __user *)arg; |
638 | int ret = 0; | |
73c619ea | 639 | struct mtd_info_user info; |
97894cda | 640 | |
289c0522 | 641 | pr_debug("MTD_ioctl\n"); |
1da177e4 | 642 | |
f7e6b19b GKH |
643 | /* |
644 | * Check the file mode to require "dangerous" commands to have write | |
645 | * permissions. | |
646 | */ | |
647 | switch (cmd) { | |
648 | /* "safe" commands */ | |
649 | case MEMGETREGIONCOUNT: | |
650 | case MEMGETREGIONINFO: | |
651 | case MEMGETINFO: | |
652 | case MEMREADOOB: | |
653 | case MEMREADOOB64: | |
654 | case MEMLOCK: | |
655 | case MEMUNLOCK: | |
656 | case MEMISLOCKED: | |
657 | case MEMGETOOBSEL: | |
658 | case MEMGETBADBLOCK: | |
659 | case MEMSETBADBLOCK: | |
660 | case OTPSELECT: | |
661 | case OTPGETREGIONCOUNT: | |
662 | case OTPGETREGIONINFO: | |
663 | case OTPLOCK: | |
664 | case ECCGETLAYOUT: | |
665 | case ECCGETSTATS: | |
666 | case MTDFILEMODE: | |
667 | case BLKPG: | |
668 | case BLKRRPART: | |
669 | break; | |
670 | ||
671 | /* "dangerous" commands */ | |
672 | case MEMERASE: | |
673 | case MEMERASE64: | |
674 | case MEMWRITEOOB: | |
675 | case MEMWRITEOOB64: | |
676 | case MEMWRITE: | |
677 | if (!(file->f_mode & FMODE_WRITE)) | |
678 | return -EPERM; | |
679 | break; | |
680 | ||
681 | default: | |
682 | return -ENOTTY; | |
683 | } | |
684 | ||
1da177e4 LT |
685 | switch (cmd) { |
686 | case MEMGETREGIONCOUNT: | |
687 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
688 | return -EFAULT; | |
689 | break; | |
690 | ||
691 | case MEMGETREGIONINFO: | |
692 | { | |
b67c5f87 ZW |
693 | uint32_t ur_idx; |
694 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 695 | struct region_info_user __user *ur = argp; |
1da177e4 | 696 | |
b67c5f87 | 697 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
698 | return -EFAULT; |
699 | ||
5e59be1f DC |
700 | if (ur_idx >= mtd->numeraseregions) |
701 | return -EINVAL; | |
702 | ||
b67c5f87 ZW |
703 | kr = &(mtd->eraseregions[ur_idx]); |
704 | ||
705 | if (put_user(kr->offset, &(ur->offset)) | |
706 | || put_user(kr->erasesize, &(ur->erasesize)) | |
707 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 708 | return -EFAULT; |
b67c5f87 | 709 | |
1da177e4 LT |
710 | break; |
711 | } | |
712 | ||
713 | case MEMGETINFO: | |
a0c5a394 | 714 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
715 | info.type = mtd->type; |
716 | info.flags = mtd->flags; | |
717 | info.size = mtd->size; | |
718 | info.erasesize = mtd->erasesize; | |
719 | info.writesize = mtd->writesize; | |
720 | info.oobsize = mtd->oobsize; | |
19fb4341 BN |
721 | /* The below field is obsolete */ |
722 | info.padding = 0; | |
73c619ea | 723 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
724 | return -EFAULT; |
725 | break; | |
726 | ||
727 | case MEMERASE: | |
0dc54e9f | 728 | case MEMERASE64: |
1da177e4 LT |
729 | { |
730 | struct erase_info *erase; | |
731 | ||
95b93a0c | 732 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
733 | if (!erase) |
734 | ret = -ENOMEM; | |
735 | else { | |
0dc54e9f KC |
736 | if (cmd == MEMERASE64) { |
737 | struct erase_info_user64 einfo64; | |
738 | ||
739 | if (copy_from_user(&einfo64, argp, | |
740 | sizeof(struct erase_info_user64))) { | |
741 | kfree(erase); | |
742 | return -EFAULT; | |
743 | } | |
744 | erase->addr = einfo64.start; | |
745 | erase->len = einfo64.length; | |
746 | } else { | |
747 | struct erase_info_user einfo32; | |
748 | ||
749 | if (copy_from_user(&einfo32, argp, | |
750 | sizeof(struct erase_info_user))) { | |
751 | kfree(erase); | |
752 | return -EFAULT; | |
753 | } | |
754 | erase->addr = einfo32.start; | |
755 | erase->len = einfo32.length; | |
1da177e4 | 756 | } |
884cfd90 | 757 | |
7e1f0dc0 | 758 | ret = mtd_erase(mtd, erase); |
1da177e4 LT |
759 | kfree(erase); |
760 | } | |
761 | break; | |
762 | } | |
763 | ||
764 | case MEMWRITEOOB: | |
765 | { | |
766 | struct mtd_oob_buf buf; | |
97718540 | 767 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 768 | |
97718540 KC |
769 | /* NOTE: writes return length to buf_user->length */ |
770 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 771 | ret = -EFAULT; |
97718540 | 772 | else |
969e57ad | 773 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
97718540 | 774 | buf.ptr, &buf_user->length); |
1da177e4 | 775 | break; |
1da177e4 LT |
776 | } |
777 | ||
778 | case MEMREADOOB: | |
779 | { | |
780 | struct mtd_oob_buf buf; | |
97718540 | 781 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 782 | |
97718540 KC |
783 | /* NOTE: writes return length to buf_user->start */ |
784 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 785 | ret = -EFAULT; |
97718540 | 786 | else |
969e57ad | 787 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
97718540 | 788 | buf.ptr, &buf_user->start); |
1da177e4 LT |
789 | break; |
790 | } | |
791 | ||
aea7cea9 KC |
792 | case MEMWRITEOOB64: |
793 | { | |
794 | struct mtd_oob_buf64 buf; | |
795 | struct mtd_oob_buf64 __user *buf_user = argp; | |
796 | ||
797 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
798 | ret = -EFAULT; | |
799 | else | |
969e57ad | 800 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
801 | (void __user *)(uintptr_t)buf.usr_ptr, |
802 | &buf_user->length); | |
803 | break; | |
804 | } | |
805 | ||
806 | case MEMREADOOB64: | |
807 | { | |
808 | struct mtd_oob_buf64 buf; | |
809 | struct mtd_oob_buf64 __user *buf_user = argp; | |
810 | ||
811 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
812 | ret = -EFAULT; | |
813 | else | |
969e57ad | 814 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
815 | (void __user *)(uintptr_t)buf.usr_ptr, |
816 | &buf_user->length); | |
817 | break; | |
818 | } | |
819 | ||
e99d8b08 BN |
820 | case MEMWRITE: |
821 | { | |
969e57ad | 822 | ret = mtdchar_write_ioctl(mtd, |
e99d8b08 BN |
823 | (struct mtd_write_req __user *)arg); |
824 | break; | |
825 | } | |
826 | ||
1da177e4 LT |
827 | case MEMLOCK: |
828 | { | |
175428b2 | 829 | struct erase_info_user einfo; |
1da177e4 | 830 | |
175428b2 | 831 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
832 | return -EFAULT; |
833 | ||
38134565 | 834 | ret = mtd_lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
835 | break; |
836 | } | |
837 | ||
838 | case MEMUNLOCK: | |
839 | { | |
175428b2 | 840 | struct erase_info_user einfo; |
1da177e4 | 841 | |
175428b2 | 842 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
843 | return -EFAULT; |
844 | ||
38134565 | 845 | ret = mtd_unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
846 | break; |
847 | } | |
848 | ||
9938424f RC |
849 | case MEMISLOCKED: |
850 | { | |
851 | struct erase_info_user einfo; | |
852 | ||
853 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
854 | return -EFAULT; | |
855 | ||
38134565 | 856 | ret = mtd_is_locked(mtd, einfo.start, einfo.length); |
9938424f RC |
857 | break; |
858 | } | |
859 | ||
5bd34c09 | 860 | /* Legacy interface */ |
1da177e4 LT |
861 | case MEMGETOOBSEL: |
862 | { | |
5bd34c09 TG |
863 | struct nand_oobinfo oi; |
864 | ||
46b5889c | 865 | if (!master->ooblayout) |
5bd34c09 | 866 | return -EOPNOTSUPP; |
5bd34c09 | 867 | |
c2b78452 BB |
868 | ret = get_oobinfo(mtd, &oi); |
869 | if (ret) | |
870 | return ret; | |
5bd34c09 TG |
871 | |
872 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
873 | return -EFAULT; |
874 | break; | |
875 | } | |
876 | ||
877 | case MEMGETBADBLOCK: | |
878 | { | |
879 | loff_t offs; | |
97894cda | 880 | |
1da177e4 LT |
881 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
882 | return -EFAULT; | |
8f461a73 | 883 | return mtd_block_isbad(mtd, offs); |
1da177e4 LT |
884 | } |
885 | ||
886 | case MEMSETBADBLOCK: | |
887 | { | |
888 | loff_t offs; | |
889 | ||
890 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
891 | return -EFAULT; | |
800ffd34 | 892 | return mtd_block_markbad(mtd, offs); |
1da177e4 LT |
893 | } |
894 | ||
31f4233b NP |
895 | case OTPSELECT: |
896 | { | |
897 | int mode; | |
898 | if (copy_from_user(&mode, argp, sizeof(int))) | |
899 | return -EFAULT; | |
f1a28c02 | 900 | |
beb133fc | 901 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 TG |
902 | |
903 | ret = otp_select_filemode(mfi, mode); | |
904 | ||
81dba488 | 905 | file->f_pos = 0; |
31f4233b NP |
906 | break; |
907 | } | |
908 | ||
909 | case OTPGETREGIONCOUNT: | |
910 | case OTPGETREGIONINFO: | |
911 | { | |
912 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
4b78fc42 | 913 | size_t retlen; |
31f4233b NP |
914 | if (!buf) |
915 | return -ENOMEM; | |
f1a28c02 | 916 | switch (mfi->mode) { |
beb133fc | 917 | case MTD_FILE_MODE_OTP_FACTORY: |
4b78fc42 | 918 | ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf); |
31f4233b | 919 | break; |
beb133fc | 920 | case MTD_FILE_MODE_OTP_USER: |
4b78fc42 | 921 | ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf); |
31f4233b | 922 | break; |
f1a28c02 | 923 | default: |
87e858a9 | 924 | ret = -EINVAL; |
f1a28c02 | 925 | break; |
31f4233b | 926 | } |
4b78fc42 | 927 | if (!ret) { |
31f4233b | 928 | if (cmd == OTPGETREGIONCOUNT) { |
4b78fc42 | 929 | int nbr = retlen / sizeof(struct otp_info); |
31f4233b NP |
930 | ret = copy_to_user(argp, &nbr, sizeof(int)); |
931 | } else | |
4b78fc42 | 932 | ret = copy_to_user(argp, buf, retlen); |
31f4233b NP |
933 | if (ret) |
934 | ret = -EFAULT; | |
935 | } | |
936 | kfree(buf); | |
937 | break; | |
938 | } | |
939 | ||
940 | case OTPLOCK: | |
941 | { | |
175428b2 | 942 | struct otp_info oinfo; |
31f4233b | 943 | |
beb133fc | 944 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
31f4233b | 945 | return -EINVAL; |
175428b2 | 946 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b | 947 | return -EFAULT; |
4403dbfb | 948 | ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
949 | break; |
950 | } | |
31f4233b | 951 | |
7854d3f7 | 952 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
953 | case ECCGETLAYOUT: |
954 | { | |
cc26c3cd BN |
955 | struct nand_ecclayout_user *usrlay; |
956 | ||
46b5889c | 957 | if (!master->ooblayout) |
f1a28c02 TG |
958 | return -EOPNOTSUPP; |
959 | ||
cc26c3cd BN |
960 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
961 | if (!usrlay) | |
962 | return -ENOMEM; | |
963 | ||
c2b78452 | 964 | shrink_ecclayout(mtd, usrlay); |
cc26c3cd BN |
965 | |
966 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
967 | ret = -EFAULT; | |
968 | kfree(usrlay); | |
f1a28c02 TG |
969 | break; |
970 | } | |
971 | ||
972 | case ECCGETSTATS: | |
973 | { | |
974 | if (copy_to_user(argp, &mtd->ecc_stats, | |
975 | sizeof(struct mtd_ecc_stats))) | |
976 | return -EFAULT; | |
977 | break; | |
978 | } | |
979 | ||
980 | case MTDFILEMODE: | |
981 | { | |
982 | mfi->mode = 0; | |
983 | ||
984 | switch(arg) { | |
beb133fc BN |
985 | case MTD_FILE_MODE_OTP_FACTORY: |
986 | case MTD_FILE_MODE_OTP_USER: | |
f1a28c02 TG |
987 | ret = otp_select_filemode(mfi, arg); |
988 | break; | |
989 | ||
beb133fc | 990 | case MTD_FILE_MODE_RAW: |
fc002e3c | 991 | if (!mtd_has_oob(mtd)) |
f1a28c02 TG |
992 | return -EOPNOTSUPP; |
993 | mfi->mode = arg; | |
994 | ||
beb133fc | 995 | case MTD_FILE_MODE_NORMAL: |
f1a28c02 TG |
996 | break; |
997 | default: | |
998 | ret = -EINVAL; | |
999 | } | |
1000 | file->f_pos = 0; | |
1001 | break; | |
1002 | } | |
1003 | ||
d0f7959e RT |
1004 | case BLKPG: |
1005 | { | |
53bb724f BN |
1006 | struct blkpg_ioctl_arg __user *blk_arg = argp; |
1007 | struct blkpg_ioctl_arg a; | |
1008 | ||
1009 | if (copy_from_user(&a, blk_arg, sizeof(a))) | |
1010 | ret = -EFAULT; | |
1011 | else | |
1012 | ret = mtdchar_blkpg_ioctl(mtd, &a); | |
d0f7959e RT |
1013 | break; |
1014 | } | |
1015 | ||
1016 | case BLKRRPART: | |
1017 | { | |
1018 | /* No reread partition feature. Just return ok */ | |
1019 | ret = 0; | |
1020 | break; | |
1021 | } | |
1da177e4 LT |
1022 | } |
1023 | ||
1024 | return ret; | |
1025 | } /* memory_ioctl */ | |
1026 | ||
969e57ad | 1027 | static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
55929332 AB |
1028 | { |
1029 | int ret; | |
1030 | ||
5aa82940 | 1031 | mutex_lock(&mtd_mutex); |
969e57ad | 1032 | ret = mtdchar_ioctl(file, cmd, arg); |
5aa82940 | 1033 | mutex_unlock(&mtd_mutex); |
55929332 AB |
1034 | |
1035 | return ret; | |
1036 | } | |
1037 | ||
97718540 KC |
1038 | #ifdef CONFIG_COMPAT |
1039 | ||
1040 | struct mtd_oob_buf32 { | |
1041 | u_int32_t start; | |
1042 | u_int32_t length; | |
1043 | compat_caddr_t ptr; /* unsigned char* */ | |
1044 | }; | |
1045 | ||
1046 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
1047 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
1048 | ||
969e57ad | 1049 | static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, |
97718540 KC |
1050 | unsigned long arg) |
1051 | { | |
1052 | struct mtd_file_info *mfi = file->private_data; | |
1053 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 1054 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1055 | int ret = 0; |
1056 | ||
5aa82940 | 1057 | mutex_lock(&mtd_mutex); |
97718540 KC |
1058 | |
1059 | switch (cmd) { | |
1060 | case MEMWRITEOOB32: | |
1061 | { | |
1062 | struct mtd_oob_buf32 buf; | |
1063 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1064 | ||
f7e6b19b GKH |
1065 | if (!(file->f_mode & FMODE_WRITE)) { |
1066 | ret = -EPERM; | |
1067 | break; | |
1068 | } | |
1069 | ||
97718540 KC |
1070 | if (copy_from_user(&buf, argp, sizeof(buf))) |
1071 | ret = -EFAULT; | |
1072 | else | |
969e57ad | 1073 | ret = mtdchar_writeoob(file, mtd, buf.start, |
97718540 KC |
1074 | buf.length, compat_ptr(buf.ptr), |
1075 | &buf_user->length); | |
1076 | break; | |
1077 | } | |
1078 | ||
1079 | case MEMREADOOB32: | |
1080 | { | |
1081 | struct mtd_oob_buf32 buf; | |
1082 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1083 | ||
1084 | /* NOTE: writes return length to buf->start */ | |
1085 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1086 | ret = -EFAULT; | |
1087 | else | |
969e57ad | 1088 | ret = mtdchar_readoob(file, mtd, buf.start, |
97718540 KC |
1089 | buf.length, compat_ptr(buf.ptr), |
1090 | &buf_user->start); | |
1091 | break; | |
1092 | } | |
53bb724f BN |
1093 | |
1094 | case BLKPG: | |
1095 | { | |
1096 | /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */ | |
1097 | struct blkpg_compat_ioctl_arg __user *uarg = argp; | |
1098 | struct blkpg_compat_ioctl_arg compat_arg; | |
1099 | struct blkpg_ioctl_arg a; | |
1100 | ||
1101 | if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) { | |
1102 | ret = -EFAULT; | |
1103 | break; | |
1104 | } | |
1105 | ||
1106 | memset(&a, 0, sizeof(a)); | |
1107 | a.op = compat_arg.op; | |
1108 | a.flags = compat_arg.flags; | |
1109 | a.datalen = compat_arg.datalen; | |
1110 | a.data = compat_ptr(compat_arg.data); | |
1111 | ||
1112 | ret = mtdchar_blkpg_ioctl(mtd, &a); | |
1113 | break; | |
1114 | } | |
1115 | ||
97718540 | 1116 | default: |
969e57ad | 1117 | ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1118 | } |
1119 | ||
5aa82940 | 1120 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1121 | |
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | #endif /* CONFIG_COMPAT */ | |
1126 | ||
402d3265 DH |
1127 | /* |
1128 | * try to determine where a shared mapping can be made | |
1129 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1130 | * mappings) | |
1131 | */ | |
1132 | #ifndef CONFIG_MMU | |
969e57ad | 1133 | static unsigned long mtdchar_get_unmapped_area(struct file *file, |
402d3265 DH |
1134 | unsigned long addr, |
1135 | unsigned long len, | |
1136 | unsigned long pgoff, | |
1137 | unsigned long flags) | |
1138 | { | |
1139 | struct mtd_file_info *mfi = file->private_data; | |
1140 | struct mtd_info *mtd = mfi->mtd; | |
cd621274 AB |
1141 | unsigned long offset; |
1142 | int ret; | |
402d3265 | 1143 | |
cd621274 AB |
1144 | if (addr != 0) |
1145 | return (unsigned long) -EINVAL; | |
402d3265 | 1146 | |
cd621274 AB |
1147 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) |
1148 | return (unsigned long) -EINVAL; | |
402d3265 | 1149 | |
cd621274 AB |
1150 | offset = pgoff << PAGE_SHIFT; |
1151 | if (offset > mtd->size - len) | |
1152 | return (unsigned long) -EINVAL; | |
402d3265 | 1153 | |
cd621274 | 1154 | ret = mtd_get_unmapped_area(mtd, len, offset, flags); |
b9995932 | 1155 | return ret == -EOPNOTSUPP ? -ENODEV : ret; |
402d3265 | 1156 | } |
b4caecd4 CH |
1157 | |
1158 | static unsigned mtdchar_mmap_capabilities(struct file *file) | |
1159 | { | |
1160 | struct mtd_file_info *mfi = file->private_data; | |
1161 | ||
1162 | return mtd_mmap_capabilities(mfi->mtd); | |
1163 | } | |
402d3265 DH |
1164 | #endif |
1165 | ||
1166 | /* | |
1167 | * set up a mapping for shared memory segments | |
1168 | */ | |
969e57ad | 1169 | static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) |
402d3265 DH |
1170 | { |
1171 | #ifdef CONFIG_MMU | |
1172 | struct mtd_file_info *mfi = file->private_data; | |
1173 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d | 1174 | struct map_info *map = mtd->priv; |
dd02b67d | 1175 | |
f5cf8f07 DW |
1176 | /* This is broken because it assumes the MTD device is map-based |
1177 | and that mtd->priv is a valid struct map_info. It should be | |
1178 | replaced with something that uses the mtd_get_unmapped_area() | |
1179 | operation properly. */ | |
1180 | if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { | |
dd02b67d | 1181 | #ifdef pgprot_noncached |
8558e4a2 | 1182 | if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) |
dd02b67d AG |
1183 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1184 | #endif | |
8558e4a2 | 1185 | return vm_iomap_memory(vma, map->phys, map->size); |
dd02b67d | 1186 | } |
b9995932 | 1187 | return -ENODEV; |
402d3265 | 1188 | #else |
b9995932 | 1189 | return vma->vm_flags & VM_SHARED ? 0 : -EACCES; |
402d3265 DH |
1190 | #endif |
1191 | } | |
1192 | ||
d54b1fdb | 1193 | static const struct file_operations mtd_fops = { |
1da177e4 | 1194 | .owner = THIS_MODULE, |
969e57ad AB |
1195 | .llseek = mtdchar_lseek, |
1196 | .read = mtdchar_read, | |
1197 | .write = mtdchar_write, | |
1198 | .unlocked_ioctl = mtdchar_unlocked_ioctl, | |
97718540 | 1199 | #ifdef CONFIG_COMPAT |
969e57ad | 1200 | .compat_ioctl = mtdchar_compat_ioctl, |
97718540 | 1201 | #endif |
969e57ad AB |
1202 | .open = mtdchar_open, |
1203 | .release = mtdchar_close, | |
1204 | .mmap = mtdchar_mmap, | |
402d3265 | 1205 | #ifndef CONFIG_MMU |
969e57ad | 1206 | .get_unmapped_area = mtdchar_get_unmapped_area, |
b4caecd4 | 1207 | .mmap_capabilities = mtdchar_mmap_capabilities, |
402d3265 | 1208 | #endif |
1da177e4 LT |
1209 | }; |
1210 | ||
660685d9 | 1211 | int __init init_mtdchar(void) |
1da177e4 | 1212 | { |
cd874237 | 1213 | int ret; |
1f24b5a8 | 1214 | |
cd874237 | 1215 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1216 | "mtd", &mtd_fops); |
cd874237 | 1217 | if (ret < 0) { |
57ae2b60 AB |
1218 | pr_err("Can't allocate major number %d for MTD\n", |
1219 | MTD_CHAR_MAJOR); | |
cd874237 | 1220 | return ret; |
9bc7b387 TP |
1221 | } |
1222 | ||
cd874237 | 1223 | return ret; |
1da177e4 LT |
1224 | } |
1225 | ||
660685d9 | 1226 | void __exit cleanup_mtdchar(void) |
1da177e4 | 1227 | { |
dad0db31 | 1228 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1229 | } |
1230 | ||
90160e13 | 1231 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |