]>
Commit | Line | Data |
---|---|---|
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 | ||
045e9a5d | 30 | /* |
f1a28c02 | 31 | * Data structure to hold the pointer to the mtd device as well |
92394b5c | 32 | * as mode information of various use cases. |
045e9a5d | 33 | */ |
f1a28c02 TG |
34 | struct mtd_file_info { |
35 | struct mtd_info *mtd; | |
36 | enum mtd_file_modes mode; | |
37 | }; | |
31f4233b | 38 | |
969e57ad | 39 | static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 | 40 | { |
f1a28c02 | 41 | struct mtd_file_info *mfi = file->private_data; |
b959957f | 42 | return fixed_size_llseek(file, offset, orig, mfi->mtd->size); |
1da177e4 LT |
43 | } |
44 | ||
969e57ad | 45 | static int mtdchar_open(struct inode *inode, struct file *file) |
1da177e4 LT |
46 | { |
47 | int minor = iminor(inode); | |
48 | int devnum = minor >> 1; | |
6071239e | 49 | int ret = 0; |
1da177e4 | 50 | struct mtd_info *mtd; |
f1a28c02 | 51 | struct mtd_file_info *mfi; |
1da177e4 | 52 | |
289c0522 | 53 | pr_debug("MTD_open\n"); |
1da177e4 | 54 | |
1da177e4 | 55 | /* You can't open the RO devices RW */ |
aeb5d727 | 56 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
1da177e4 LT |
57 | return -EACCES; |
58 | ||
59 | mtd = get_mtd_device(NULL, devnum); | |
97894cda | 60 | |
ecd400ce AS |
61 | if (IS_ERR(mtd)) |
62 | return PTR_ERR(mtd); | |
97894cda | 63 | |
402d3265 | 64 | if (mtd->type == MTD_ABSENT) { |
6071239e | 65 | ret = -ENODEV; |
c65390f4 | 66 | goto out1; |
1da177e4 LT |
67 | } |
68 | ||
1da177e4 | 69 | /* You can't open it RW if it's not a writeable device */ |
aeb5d727 | 70 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
6071239e | 71 | ret = -EACCES; |
b4caecd4 | 72 | goto out1; |
1da177e4 | 73 | } |
97894cda | 74 | |
f1a28c02 TG |
75 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
76 | if (!mfi) { | |
6071239e | 77 | ret = -ENOMEM; |
b4caecd4 | 78 | goto out1; |
f1a28c02 TG |
79 | } |
80 | mfi->mtd = mtd; | |
81 | file->private_data = mfi; | |
c65390f4 | 82 | return 0; |
f1a28c02 | 83 | |
c65390f4 AV |
84 | out1: |
85 | put_mtd_device(mtd); | |
6071239e | 86 | return ret; |
969e57ad | 87 | } /* mtdchar_open */ |
1da177e4 LT |
88 | |
89 | /*====================================================================*/ | |
90 | ||
969e57ad | 91 | static int mtdchar_close(struct inode *inode, struct file *file) |
1da177e4 | 92 | { |
f1a28c02 TG |
93 | struct mtd_file_info *mfi = file->private_data; |
94 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 | 95 | |
289c0522 | 96 | pr_debug("MTD_close\n"); |
1da177e4 | 97 | |
7eafaed5 | 98 | /* Only sync if opened RW */ |
327cf292 | 99 | if ((file->f_mode & FMODE_WRITE)) |
85f2f2a8 | 100 | mtd_sync(mtd); |
97894cda | 101 | |
1da177e4 | 102 | put_mtd_device(mtd); |
f1a28c02 TG |
103 | file->private_data = NULL; |
104 | kfree(mfi); | |
1da177e4 LT |
105 | |
106 | return 0; | |
969e57ad | 107 | } /* mtdchar_close */ |
1da177e4 | 108 | |
3e45cf5e GE |
109 | /* Back in June 2001, dwmw2 wrote: |
110 | * | |
111 | * FIXME: This _really_ needs to die. In 2.5, we should lock the | |
112 | * userspace buffer down and use it directly with readv/writev. | |
113 | * | |
114 | * The implementation below, using mtd_kmalloc_up_to, mitigates | |
115 | * allocation failures when the system is under low-memory situations | |
116 | * or if memory is highly fragmented at the cost of reducing the | |
117 | * performance of the requested transfer due to a smaller buffer size. | |
118 | * | |
119 | * A more complex but more memory-efficient implementation based on | |
120 | * get_user_pages and iovecs to cover extents of those pages is a | |
121 | * longer-term goal, as intimated by dwmw2 above. However, for the | |
122 | * write case, this requires yet more complex head and tail transfer | |
123 | * handling when those head and tail offsets and sizes are such that | |
124 | * alignment requirements are not met in the NAND subdriver. | |
125 | */ | |
1da177e4 | 126 | |
969e57ad AB |
127 | static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
128 | loff_t *ppos) | |
1da177e4 | 129 | { |
f1a28c02 TG |
130 | struct mtd_file_info *mfi = file->private_data; |
131 | struct mtd_info *mtd = mfi->mtd; | |
30fa9848 | 132 | size_t retlen; |
1da177e4 LT |
133 | size_t total_retlen=0; |
134 | int ret=0; | |
135 | int len; | |
3e45cf5e | 136 | size_t size = count; |
1da177e4 | 137 | char *kbuf; |
97894cda | 138 | |
289c0522 | 139 | pr_debug("MTD_read\n"); |
1da177e4 | 140 | |
6c6bc9ea JH |
141 | if (*ppos + count > mtd->size) { |
142 | if (*ppos < mtd->size) | |
143 | count = mtd->size - *ppos; | |
144 | else | |
145 | count = 0; | |
146 | } | |
1da177e4 LT |
147 | |
148 | if (!count) | |
149 | return 0; | |
97894cda | 150 | |
3e45cf5e | 151 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
152 | if (!kbuf) |
153 | return -ENOMEM; | |
154 | ||
1da177e4 | 155 | while (count) { |
3e45cf5e | 156 | len = min_t(size_t, count, size); |
1da177e4 | 157 | |
f1a28c02 | 158 | switch (mfi->mode) { |
beb133fc | 159 | case MTD_FILE_MODE_OTP_FACTORY: |
d264f72a AB |
160 | ret = mtd_read_fact_prot_reg(mtd, *ppos, len, |
161 | &retlen, kbuf); | |
31f4233b | 162 | break; |
beb133fc | 163 | case MTD_FILE_MODE_OTP_USER: |
4ea1cabb AB |
164 | ret = mtd_read_user_prot_reg(mtd, *ppos, len, |
165 | &retlen, kbuf); | |
31f4233b | 166 | break; |
beb133fc | 167 | case MTD_FILE_MODE_RAW: |
f1a28c02 | 168 | { |
717bc8a6 | 169 | struct mtd_oob_ops ops = {}; |
f1a28c02 | 170 | |
0612b9dd | 171 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
172 | ops.datbuf = kbuf; |
173 | ops.oobbuf = NULL; | |
174 | ops.len = len; | |
175 | ||
fd2819bb | 176 | ret = mtd_read_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
177 | retlen = ops.retlen; |
178 | break; | |
179 | } | |
31f4233b | 180 | default: |
329ad399 | 181 | ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 182 | } |
7854d3f7 | 183 | /* Nand returns -EBADMSG on ECC errors, but it returns |
1da177e4 | 184 | * the data. For our userspace tools it is important |
7854d3f7 | 185 | * to dump areas with ECC errors! |
9a1fcdfd | 186 | * For kernel internal usage it also might return -EUCLEAN |
25985edc | 187 | * to signal the caller that a bitflip has occurred and has |
9a1fcdfd | 188 | * been corrected by the ECC algorithm. |
1da177e4 LT |
189 | * Userspace software which accesses NAND this way |
190 | * must be aware of the fact that it deals with NAND | |
191 | */ | |
d57f4054 | 192 | if (!ret || mtd_is_bitflip_or_eccerr(ret)) { |
1da177e4 LT |
193 | *ppos += retlen; |
194 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 195 | kfree(kbuf); |
1da177e4 LT |
196 | return -EFAULT; |
197 | } | |
198 | else | |
199 | total_retlen += retlen; | |
200 | ||
201 | count -= retlen; | |
202 | buf += retlen; | |
31f4233b NP |
203 | if (retlen == 0) |
204 | count = 0; | |
1da177e4 LT |
205 | } |
206 | else { | |
207 | kfree(kbuf); | |
208 | return ret; | |
209 | } | |
97894cda | 210 | |
1da177e4 LT |
211 | } |
212 | ||
b802c074 | 213 | kfree(kbuf); |
1da177e4 | 214 | return total_retlen; |
969e57ad | 215 | } /* mtdchar_read */ |
1da177e4 | 216 | |
969e57ad AB |
217 | static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
218 | loff_t *ppos) | |
1da177e4 | 219 | { |
f1a28c02 TG |
220 | struct mtd_file_info *mfi = file->private_data; |
221 | struct mtd_info *mtd = mfi->mtd; | |
3e45cf5e | 222 | size_t size = count; |
1da177e4 LT |
223 | char *kbuf; |
224 | size_t retlen; | |
225 | size_t total_retlen=0; | |
226 | int ret=0; | |
227 | int len; | |
228 | ||
289c0522 | 229 | pr_debug("MTD_write\n"); |
97894cda | 230 | |
6c6bc9ea | 231 | if (*ppos >= mtd->size) |
1da177e4 | 232 | return -ENOSPC; |
97894cda | 233 | |
1da177e4 LT |
234 | if (*ppos + count > mtd->size) |
235 | count = mtd->size - *ppos; | |
236 | ||
237 | if (!count) | |
238 | return 0; | |
239 | ||
3e45cf5e | 240 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
241 | if (!kbuf) |
242 | return -ENOMEM; | |
243 | ||
1da177e4 | 244 | while (count) { |
3e45cf5e | 245 | len = min_t(size_t, count, size); |
1da177e4 | 246 | |
1da177e4 LT |
247 | if (copy_from_user(kbuf, buf, len)) { |
248 | kfree(kbuf); | |
249 | return -EFAULT; | |
250 | } | |
97894cda | 251 | |
f1a28c02 | 252 | switch (mfi->mode) { |
beb133fc | 253 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
254 | ret = -EROFS; |
255 | break; | |
beb133fc | 256 | case MTD_FILE_MODE_OTP_USER: |
482b43ad AB |
257 | ret = mtd_write_user_prot_reg(mtd, *ppos, len, |
258 | &retlen, kbuf); | |
31f4233b | 259 | break; |
f1a28c02 | 260 | |
beb133fc | 261 | case MTD_FILE_MODE_RAW: |
f1a28c02 | 262 | { |
717bc8a6 | 263 | struct mtd_oob_ops ops = {}; |
f1a28c02 | 264 | |
0612b9dd | 265 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
266 | ops.datbuf = kbuf; |
267 | ops.oobbuf = NULL; | |
bf514081 | 268 | ops.ooboffs = 0; |
f1a28c02 TG |
269 | ops.len = len; |
270 | ||
a2cc5ba0 | 271 | ret = mtd_write_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
272 | retlen = ops.retlen; |
273 | break; | |
274 | } | |
275 | ||
31f4233b | 276 | default: |
eda95cbf | 277 | ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 278 | } |
9a78bc83 CR |
279 | |
280 | /* | |
281 | * Return -ENOSPC only if no data could be written at all. | |
282 | * Otherwise just return the number of bytes that actually | |
283 | * have been written. | |
284 | */ | |
285 | if ((ret == -ENOSPC) && (total_retlen)) | |
286 | break; | |
287 | ||
1da177e4 LT |
288 | if (!ret) { |
289 | *ppos += retlen; | |
290 | total_retlen += retlen; | |
291 | count -= retlen; | |
292 | buf += retlen; | |
293 | } | |
294 | else { | |
295 | kfree(kbuf); | |
296 | return ret; | |
297 | } | |
1da177e4 LT |
298 | } |
299 | ||
b802c074 | 300 | kfree(kbuf); |
1da177e4 | 301 | return total_retlen; |
969e57ad | 302 | } /* mtdchar_write */ |
1da177e4 LT |
303 | |
304 | /*====================================================================== | |
305 | ||
306 | IOCTL calls for getting device parameters. | |
307 | ||
308 | ======================================================================*/ | |
1da177e4 | 309 | |
f1a28c02 TG |
310 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
311 | { | |
312 | struct mtd_info *mtd = mfi->mtd; | |
b6de3d6c | 313 | size_t retlen; |
b6de3d6c | 314 | |
f1a28c02 TG |
315 | switch (mode) { |
316 | case MTD_OTP_FACTORY: | |
5dc63fa2 UKK |
317 | if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == |
318 | -EOPNOTSUPP) | |
319 | return -EOPNOTSUPP; | |
320 | ||
b6de3d6c | 321 | mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
f1a28c02 TG |
322 | break; |
323 | case MTD_OTP_USER: | |
5dc63fa2 UKK |
324 | if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == |
325 | -EOPNOTSUPP) | |
326 | return -EOPNOTSUPP; | |
327 | ||
b6de3d6c | 328 | mfi->mode = MTD_FILE_MODE_OTP_USER; |
f1a28c02 | 329 | break; |
f1a28c02 | 330 | case MTD_OTP_OFF: |
5dc63fa2 | 331 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 | 332 | break; |
5dc63fa2 UKK |
333 | default: |
334 | return -EINVAL; | |
f1a28c02 | 335 | } |
5dc63fa2 UKK |
336 | |
337 | return 0; | |
f1a28c02 | 338 | } |
f1a28c02 | 339 | |
969e57ad | 340 | static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, |
97718540 KC |
341 | uint64_t start, uint32_t length, void __user *ptr, |
342 | uint32_t __user *retp) | |
343 | { | |
46b5889c | 344 | struct mtd_info *master = mtd_get_master(mtd); |
9ce244b3 | 345 | struct mtd_file_info *mfi = file->private_data; |
717bc8a6 | 346 | struct mtd_oob_ops ops = {}; |
97718540 KC |
347 | uint32_t retlen; |
348 | int ret = 0; | |
349 | ||
97718540 KC |
350 | if (length > 4096) |
351 | return -EINVAL; | |
352 | ||
46b5889c | 353 | if (!master->_write_oob) |
0db188f9 | 354 | return -EOPNOTSUPP; |
97718540 KC |
355 | |
356 | ops.ooblen = length; | |
305b93f1 | 357 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 358 | ops.datbuf = NULL; |
beb133fc | 359 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 360 | MTD_OPS_PLACE_OOB; |
97718540 KC |
361 | |
362 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
363 | return -EINVAL; | |
364 | ||
df1f1d1c JL |
365 | ops.oobbuf = memdup_user(ptr, length); |
366 | if (IS_ERR(ops.oobbuf)) | |
367 | return PTR_ERR(ops.oobbuf); | |
97718540 | 368 | |
305b93f1 | 369 | start &= ~((uint64_t)mtd->writesize - 1); |
a2cc5ba0 | 370 | ret = mtd_write_oob(mtd, start, &ops); |
97718540 KC |
371 | |
372 | if (ops.oobretlen > 0xFFFFFFFFU) | |
373 | ret = -EOVERFLOW; | |
374 | retlen = ops.oobretlen; | |
375 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
376 | ret = -EFAULT; | |
377 | ||
378 | kfree(ops.oobbuf); | |
379 | return ret; | |
380 | } | |
381 | ||
969e57ad | 382 | static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
c46f6483 BN |
383 | uint64_t start, uint32_t length, void __user *ptr, |
384 | uint32_t __user *retp) | |
97718540 | 385 | { |
c46f6483 | 386 | struct mtd_file_info *mfi = file->private_data; |
717bc8a6 | 387 | struct mtd_oob_ops ops = {}; |
97718540 KC |
388 | int ret = 0; |
389 | ||
390 | if (length > 4096) | |
391 | return -EINVAL; | |
392 | ||
97718540 | 393 | ops.ooblen = length; |
305b93f1 | 394 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 395 | ops.datbuf = NULL; |
beb133fc | 396 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 397 | MTD_OPS_PLACE_OOB; |
97718540 KC |
398 | |
399 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
400 | return -EINVAL; | |
401 | ||
402 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
403 | if (!ops.oobbuf) | |
404 | return -ENOMEM; | |
405 | ||
305b93f1 | 406 | start &= ~((uint64_t)mtd->writesize - 1); |
fd2819bb | 407 | ret = mtd_read_oob(mtd, start, &ops); |
97718540 KC |
408 | |
409 | if (put_user(ops.oobretlen, retp)) | |
410 | ret = -EFAULT; | |
411 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
412 | ops.oobretlen)) | |
413 | ret = -EFAULT; | |
414 | ||
415 | kfree(ops.oobbuf); | |
041e4575 BN |
416 | |
417 | /* | |
418 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
419 | * data. For our userspace tools it is important to dump areas | |
420 | * with ECC errors! | |
421 | * For kernel internal usage it also might return -EUCLEAN | |
5d708ecc | 422 | * to signal the caller that a bitflip has occurred and has |
041e4575 BN |
423 | * been corrected by the ECC algorithm. |
424 | * | |
c478d7e4 BN |
425 | * Note: currently the standard NAND function, nand_read_oob_std, |
426 | * does not calculate ECC for the OOB area, so do not rely on | |
427 | * this behavior unless you have replaced it with your own. | |
041e4575 | 428 | */ |
d57f4054 | 429 | if (mtd_is_bitflip_or_eccerr(ret)) |
041e4575 BN |
430 | return 0; |
431 | ||
97718540 KC |
432 | return ret; |
433 | } | |
434 | ||
cc26c3cd | 435 | /* |
aab616e3 BB |
436 | * Copies (and truncates, if necessary) OOB layout information to the |
437 | * deprecated layout struct, nand_ecclayout_user. This is necessary only to | |
438 | * support the deprecated API ioctl ECCGETLAYOUT while allowing all new | |
439 | * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops | |
440 | * can describe any kind of OOB layout with almost zero overhead from a | |
441 | * memory usage point of view). | |
cc26c3cd | 442 | */ |
c2b78452 BB |
443 | static int shrink_ecclayout(struct mtd_info *mtd, |
444 | struct nand_ecclayout_user *to) | |
cc26c3cd | 445 | { |
c2b78452 BB |
446 | struct mtd_oob_region oobregion; |
447 | int i, section = 0, ret; | |
cc26c3cd | 448 | |
c2b78452 | 449 | if (!mtd || !to) |
cc26c3cd BN |
450 | return -EINVAL; |
451 | ||
452 | memset(to, 0, sizeof(*to)); | |
453 | ||
c2b78452 BB |
454 | to->eccbytes = 0; |
455 | for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) { | |
456 | u32 eccpos; | |
457 | ||
6de56493 | 458 | ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
c2b78452 BB |
459 | if (ret < 0) { |
460 | if (ret != -ERANGE) | |
461 | return ret; | |
462 | ||
463 | break; | |
464 | } | |
465 | ||
466 | eccpos = oobregion.offset; | |
467 | for (; i < MTD_MAX_ECCPOS_ENTRIES && | |
468 | eccpos < oobregion.offset + oobregion.length; i++) { | |
469 | to->eccpos[i] = eccpos++; | |
470 | to->eccbytes++; | |
471 | } | |
472 | } | |
cc26c3cd BN |
473 | |
474 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
c2b78452 BB |
475 | ret = mtd_ooblayout_free(mtd, i, &oobregion); |
476 | if (ret < 0) { | |
477 | if (ret != -ERANGE) | |
478 | return ret; | |
479 | ||
480 | break; | |
481 | } | |
482 | ||
483 | to->oobfree[i].offset = oobregion.offset; | |
484 | to->oobfree[i].length = oobregion.length; | |
485 | to->oobavail += to->oobfree[i].length; | |
486 | } | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to) | |
492 | { | |
493 | struct mtd_oob_region oobregion; | |
494 | int i, section = 0, ret; | |
495 | ||
496 | if (!mtd || !to) | |
497 | return -EINVAL; | |
498 | ||
499 | memset(to, 0, sizeof(*to)); | |
500 | ||
501 | to->eccbytes = 0; | |
502 | for (i = 0; i < ARRAY_SIZE(to->eccpos);) { | |
503 | u32 eccpos; | |
504 | ||
6de56493 | 505 | ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
c2b78452 BB |
506 | if (ret < 0) { |
507 | if (ret != -ERANGE) | |
508 | return ret; | |
509 | ||
cc26c3cd | 510 | break; |
c2b78452 BB |
511 | } |
512 | ||
513 | if (oobregion.length + i > ARRAY_SIZE(to->eccpos)) | |
514 | return -EINVAL; | |
515 | ||
516 | eccpos = oobregion.offset; | |
517 | for (; eccpos < oobregion.offset + oobregion.length; i++) { | |
518 | to->eccpos[i] = eccpos++; | |
519 | to->eccbytes++; | |
520 | } | |
cc26c3cd BN |
521 | } |
522 | ||
c2b78452 BB |
523 | for (i = 0; i < 8; i++) { |
524 | ret = mtd_ooblayout_free(mtd, i, &oobregion); | |
525 | if (ret < 0) { | |
526 | if (ret != -ERANGE) | |
527 | return ret; | |
528 | ||
529 | break; | |
530 | } | |
531 | ||
532 | to->oobfree[i][0] = oobregion.offset; | |
533 | to->oobfree[i][1] = oobregion.length; | |
534 | } | |
535 | ||
536 | to->useecc = MTD_NANDECC_AUTOPLACE; | |
537 | ||
cc26c3cd BN |
538 | return 0; |
539 | } | |
540 | ||
969e57ad | 541 | static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
53bb724f | 542 | struct blkpg_ioctl_arg *arg) |
d0f7959e | 543 | { |
d0f7959e RT |
544 | struct blkpg_partition p; |
545 | ||
546 | if (!capable(CAP_SYS_ADMIN)) | |
547 | return -EPERM; | |
548 | ||
53bb724f | 549 | if (copy_from_user(&p, arg->data, sizeof(p))) |
d0f7959e RT |
550 | return -EFAULT; |
551 | ||
53bb724f | 552 | switch (arg->op) { |
d0f7959e RT |
553 | case BLKPG_ADD_PARTITION: |
554 | ||
a7e93dcd RT |
555 | /* Only master mtd device must be used to add partitions */ |
556 | if (mtd_is_partition(mtd)) | |
557 | return -EINVAL; | |
558 | ||
1cc8d841 BN |
559 | /* Sanitize user input */ |
560 | p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; | |
561 | ||
d0f7959e RT |
562 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
563 | ||
564 | case BLKPG_DEL_PARTITION: | |
565 | ||
566 | if (p.pno < 0) | |
567 | return -EINVAL; | |
568 | ||
569 | return mtd_del_partition(mtd, p.pno); | |
570 | ||
571 | default: | |
572 | return -EINVAL; | |
573 | } | |
574 | } | |
d0f7959e | 575 | |
969e57ad | 576 | static int mtdchar_write_ioctl(struct mtd_info *mtd, |
e99d8b08 BN |
577 | struct mtd_write_req __user *argp) |
578 | { | |
46b5889c | 579 | struct mtd_info *master = mtd_get_master(mtd); |
e99d8b08 | 580 | struct mtd_write_req req; |
717bc8a6 | 581 | struct mtd_oob_ops ops = {}; |
f62cde49 | 582 | const void __user *usr_data, *usr_oob; |
e99d8b08 BN |
583 | int ret; |
584 | ||
f62cde49 | 585 | if (copy_from_user(&req, argp, sizeof(req))) |
e99d8b08 | 586 | return -EFAULT; |
f62cde49 GU |
587 | |
588 | usr_data = (const void __user *)(uintptr_t)req.usr_data; | |
589 | usr_oob = (const void __user *)(uintptr_t)req.usr_oob; | |
f62cde49 | 590 | |
46b5889c | 591 | if (!master->_write_oob) |
e99d8b08 | 592 | return -EOPNOTSUPP; |
e99d8b08 BN |
593 | ops.mode = req.mode; |
594 | ops.len = (size_t)req.len; | |
595 | ops.ooblen = (size_t)req.ooblen; | |
596 | ops.ooboffs = 0; | |
597 | ||
f62cde49 | 598 | if (usr_data) { |
e99d8b08 BN |
599 | ops.datbuf = memdup_user(usr_data, ops.len); |
600 | if (IS_ERR(ops.datbuf)) | |
601 | return PTR_ERR(ops.datbuf); | |
602 | } else { | |
603 | ops.datbuf = NULL; | |
604 | } | |
605 | ||
f62cde49 | 606 | if (usr_oob) { |
e99d8b08 BN |
607 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); |
608 | if (IS_ERR(ops.oobbuf)) { | |
609 | kfree(ops.datbuf); | |
610 | return PTR_ERR(ops.oobbuf); | |
611 | } | |
612 | } else { | |
613 | ops.oobbuf = NULL; | |
614 | } | |
615 | ||
a2cc5ba0 | 616 | ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
e99d8b08 BN |
617 | |
618 | kfree(ops.datbuf); | |
619 | kfree(ops.oobbuf); | |
620 | ||
621 | return ret; | |
622 | } | |
623 | ||
969e57ad | 624 | static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 625 | { |
f1a28c02 TG |
626 | struct mtd_file_info *mfi = file->private_data; |
627 | struct mtd_info *mtd = mfi->mtd; | |
46b5889c | 628 | struct mtd_info *master = mtd_get_master(mtd); |
1da177e4 LT |
629 | void __user *argp = (void __user *)arg; |
630 | int ret = 0; | |
73c619ea | 631 | struct mtd_info_user info; |
97894cda | 632 | |
289c0522 | 633 | pr_debug("MTD_ioctl\n"); |
1da177e4 | 634 | |
f7e6b19b GKH |
635 | /* |
636 | * Check the file mode to require "dangerous" commands to have write | |
637 | * permissions. | |
638 | */ | |
639 | switch (cmd) { | |
640 | /* "safe" commands */ | |
641 | case MEMGETREGIONCOUNT: | |
642 | case MEMGETREGIONINFO: | |
643 | case MEMGETINFO: | |
644 | case MEMREADOOB: | |
645 | case MEMREADOOB64: | |
f7e6b19b GKH |
646 | case MEMISLOCKED: |
647 | case MEMGETOOBSEL: | |
648 | case MEMGETBADBLOCK: | |
f7e6b19b GKH |
649 | case OTPSELECT: |
650 | case OTPGETREGIONCOUNT: | |
651 | case OTPGETREGIONINFO: | |
f7e6b19b GKH |
652 | case ECCGETLAYOUT: |
653 | case ECCGETSTATS: | |
654 | case MTDFILEMODE: | |
655 | case BLKPG: | |
656 | case BLKRRPART: | |
657 | break; | |
658 | ||
659 | /* "dangerous" commands */ | |
660 | case MEMERASE: | |
661 | case MEMERASE64: | |
1e97743f MW |
662 | case MEMLOCK: |
663 | case MEMUNLOCK: | |
664 | case MEMSETBADBLOCK: | |
f7e6b19b GKH |
665 | case MEMWRITEOOB: |
666 | case MEMWRITEOOB64: | |
667 | case MEMWRITE: | |
1e97743f | 668 | case OTPLOCK: |
e3c1f1c9 | 669 | case OTPERASE: |
f7e6b19b GKH |
670 | if (!(file->f_mode & FMODE_WRITE)) |
671 | return -EPERM; | |
672 | break; | |
673 | ||
674 | default: | |
675 | return -ENOTTY; | |
676 | } | |
677 | ||
1da177e4 LT |
678 | switch (cmd) { |
679 | case MEMGETREGIONCOUNT: | |
680 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
681 | return -EFAULT; | |
682 | break; | |
683 | ||
684 | case MEMGETREGIONINFO: | |
685 | { | |
b67c5f87 ZW |
686 | uint32_t ur_idx; |
687 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 688 | struct region_info_user __user *ur = argp; |
1da177e4 | 689 | |
b67c5f87 | 690 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
691 | return -EFAULT; |
692 | ||
5e59be1f DC |
693 | if (ur_idx >= mtd->numeraseregions) |
694 | return -EINVAL; | |
695 | ||
b67c5f87 ZW |
696 | kr = &(mtd->eraseregions[ur_idx]); |
697 | ||
698 | if (put_user(kr->offset, &(ur->offset)) | |
699 | || put_user(kr->erasesize, &(ur->erasesize)) | |
700 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 701 | return -EFAULT; |
b67c5f87 | 702 | |
1da177e4 LT |
703 | break; |
704 | } | |
705 | ||
706 | case MEMGETINFO: | |
a0c5a394 | 707 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
708 | info.type = mtd->type; |
709 | info.flags = mtd->flags; | |
710 | info.size = mtd->size; | |
711 | info.erasesize = mtd->erasesize; | |
712 | info.writesize = mtd->writesize; | |
713 | info.oobsize = mtd->oobsize; | |
19fb4341 BN |
714 | /* The below field is obsolete */ |
715 | info.padding = 0; | |
73c619ea | 716 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
717 | return -EFAULT; |
718 | break; | |
719 | ||
720 | case MEMERASE: | |
0dc54e9f | 721 | case MEMERASE64: |
1da177e4 LT |
722 | { |
723 | struct erase_info *erase; | |
724 | ||
95b93a0c | 725 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
726 | if (!erase) |
727 | ret = -ENOMEM; | |
728 | else { | |
0dc54e9f KC |
729 | if (cmd == MEMERASE64) { |
730 | struct erase_info_user64 einfo64; | |
731 | ||
732 | if (copy_from_user(&einfo64, argp, | |
733 | sizeof(struct erase_info_user64))) { | |
734 | kfree(erase); | |
735 | return -EFAULT; | |
736 | } | |
737 | erase->addr = einfo64.start; | |
738 | erase->len = einfo64.length; | |
739 | } else { | |
740 | struct erase_info_user einfo32; | |
741 | ||
742 | if (copy_from_user(&einfo32, argp, | |
743 | sizeof(struct erase_info_user))) { | |
744 | kfree(erase); | |
745 | return -EFAULT; | |
746 | } | |
747 | erase->addr = einfo32.start; | |
748 | erase->len = einfo32.length; | |
1da177e4 | 749 | } |
884cfd90 | 750 | |
7e1f0dc0 | 751 | ret = mtd_erase(mtd, erase); |
1da177e4 LT |
752 | kfree(erase); |
753 | } | |
754 | break; | |
755 | } | |
756 | ||
757 | case MEMWRITEOOB: | |
758 | { | |
759 | struct mtd_oob_buf buf; | |
97718540 | 760 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 761 | |
97718540 KC |
762 | /* NOTE: writes return length to buf_user->length */ |
763 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 764 | ret = -EFAULT; |
97718540 | 765 | else |
969e57ad | 766 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
97718540 | 767 | buf.ptr, &buf_user->length); |
1da177e4 | 768 | break; |
1da177e4 LT |
769 | } |
770 | ||
771 | case MEMREADOOB: | |
772 | { | |
773 | struct mtd_oob_buf buf; | |
97718540 | 774 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 775 | |
97718540 KC |
776 | /* NOTE: writes return length to buf_user->start */ |
777 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 778 | ret = -EFAULT; |
97718540 | 779 | else |
969e57ad | 780 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
97718540 | 781 | buf.ptr, &buf_user->start); |
1da177e4 LT |
782 | break; |
783 | } | |
784 | ||
aea7cea9 KC |
785 | case MEMWRITEOOB64: |
786 | { | |
787 | struct mtd_oob_buf64 buf; | |
788 | struct mtd_oob_buf64 __user *buf_user = argp; | |
789 | ||
790 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
791 | ret = -EFAULT; | |
792 | else | |
969e57ad | 793 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
794 | (void __user *)(uintptr_t)buf.usr_ptr, |
795 | &buf_user->length); | |
796 | break; | |
797 | } | |
798 | ||
799 | case MEMREADOOB64: | |
800 | { | |
801 | struct mtd_oob_buf64 buf; | |
802 | struct mtd_oob_buf64 __user *buf_user = argp; | |
803 | ||
804 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
805 | ret = -EFAULT; | |
806 | else | |
969e57ad | 807 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
808 | (void __user *)(uintptr_t)buf.usr_ptr, |
809 | &buf_user->length); | |
810 | break; | |
811 | } | |
812 | ||
e99d8b08 BN |
813 | case MEMWRITE: |
814 | { | |
969e57ad | 815 | ret = mtdchar_write_ioctl(mtd, |
e99d8b08 BN |
816 | (struct mtd_write_req __user *)arg); |
817 | break; | |
818 | } | |
819 | ||
1da177e4 LT |
820 | case MEMLOCK: |
821 | { | |
175428b2 | 822 | struct erase_info_user einfo; |
1da177e4 | 823 | |
175428b2 | 824 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
825 | return -EFAULT; |
826 | ||
38134565 | 827 | ret = mtd_lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
828 | break; |
829 | } | |
830 | ||
831 | case MEMUNLOCK: | |
832 | { | |
175428b2 | 833 | struct erase_info_user einfo; |
1da177e4 | 834 | |
175428b2 | 835 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
836 | return -EFAULT; |
837 | ||
38134565 | 838 | ret = mtd_unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
839 | break; |
840 | } | |
841 | ||
9938424f RC |
842 | case MEMISLOCKED: |
843 | { | |
844 | struct erase_info_user einfo; | |
845 | ||
846 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
847 | return -EFAULT; | |
848 | ||
38134565 | 849 | ret = mtd_is_locked(mtd, einfo.start, einfo.length); |
9938424f RC |
850 | break; |
851 | } | |
852 | ||
5bd34c09 | 853 | /* Legacy interface */ |
1da177e4 LT |
854 | case MEMGETOOBSEL: |
855 | { | |
5bd34c09 TG |
856 | struct nand_oobinfo oi; |
857 | ||
46b5889c | 858 | if (!master->ooblayout) |
5bd34c09 | 859 | return -EOPNOTSUPP; |
5bd34c09 | 860 | |
c2b78452 BB |
861 | ret = get_oobinfo(mtd, &oi); |
862 | if (ret) | |
863 | return ret; | |
5bd34c09 TG |
864 | |
865 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
866 | return -EFAULT; |
867 | break; | |
868 | } | |
869 | ||
870 | case MEMGETBADBLOCK: | |
871 | { | |
872 | loff_t offs; | |
97894cda | 873 | |
1da177e4 LT |
874 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
875 | return -EFAULT; | |
8f461a73 | 876 | return mtd_block_isbad(mtd, offs); |
1da177e4 LT |
877 | } |
878 | ||
879 | case MEMSETBADBLOCK: | |
880 | { | |
881 | loff_t offs; | |
882 | ||
883 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
884 | return -EFAULT; | |
800ffd34 | 885 | return mtd_block_markbad(mtd, offs); |
1da177e4 LT |
886 | } |
887 | ||
31f4233b NP |
888 | case OTPSELECT: |
889 | { | |
890 | int mode; | |
891 | if (copy_from_user(&mode, argp, sizeof(int))) | |
892 | return -EFAULT; | |
f1a28c02 | 893 | |
beb133fc | 894 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 TG |
895 | |
896 | ret = otp_select_filemode(mfi, mode); | |
897 | ||
81dba488 | 898 | file->f_pos = 0; |
31f4233b NP |
899 | break; |
900 | } | |
901 | ||
902 | case OTPGETREGIONCOUNT: | |
903 | case OTPGETREGIONINFO: | |
904 | { | |
905 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
4b78fc42 | 906 | size_t retlen; |
31f4233b NP |
907 | if (!buf) |
908 | return -ENOMEM; | |
f1a28c02 | 909 | switch (mfi->mode) { |
beb133fc | 910 | case MTD_FILE_MODE_OTP_FACTORY: |
4b78fc42 | 911 | ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf); |
31f4233b | 912 | break; |
beb133fc | 913 | case MTD_FILE_MODE_OTP_USER: |
4b78fc42 | 914 | ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf); |
31f4233b | 915 | break; |
f1a28c02 | 916 | default: |
87e858a9 | 917 | ret = -EINVAL; |
f1a28c02 | 918 | break; |
31f4233b | 919 | } |
4b78fc42 | 920 | if (!ret) { |
31f4233b | 921 | if (cmd == OTPGETREGIONCOUNT) { |
4b78fc42 | 922 | int nbr = retlen / sizeof(struct otp_info); |
31f4233b NP |
923 | ret = copy_to_user(argp, &nbr, sizeof(int)); |
924 | } else | |
4b78fc42 | 925 | ret = copy_to_user(argp, buf, retlen); |
31f4233b NP |
926 | if (ret) |
927 | ret = -EFAULT; | |
928 | } | |
929 | kfree(buf); | |
930 | break; | |
931 | } | |
932 | ||
933 | case OTPLOCK: | |
e3c1f1c9 | 934 | case OTPERASE: |
31f4233b | 935 | { |
175428b2 | 936 | struct otp_info oinfo; |
31f4233b | 937 | |
beb133fc | 938 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
31f4233b | 939 | return -EINVAL; |
175428b2 | 940 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b | 941 | return -EFAULT; |
e3c1f1c9 MW |
942 | if (cmd == OTPLOCK) |
943 | ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); | |
944 | else | |
945 | ret = mtd_erase_user_prot_reg(mtd, oinfo.start, oinfo.length); | |
31f4233b NP |
946 | break; |
947 | } | |
31f4233b | 948 | |
7854d3f7 | 949 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
950 | case ECCGETLAYOUT: |
951 | { | |
cc26c3cd BN |
952 | struct nand_ecclayout_user *usrlay; |
953 | ||
46b5889c | 954 | if (!master->ooblayout) |
f1a28c02 TG |
955 | return -EOPNOTSUPP; |
956 | ||
cc26c3cd BN |
957 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
958 | if (!usrlay) | |
959 | return -ENOMEM; | |
960 | ||
c2b78452 | 961 | shrink_ecclayout(mtd, usrlay); |
cc26c3cd BN |
962 | |
963 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
964 | ret = -EFAULT; | |
965 | kfree(usrlay); | |
f1a28c02 TG |
966 | break; |
967 | } | |
968 | ||
969 | case ECCGETSTATS: | |
970 | { | |
971 | if (copy_to_user(argp, &mtd->ecc_stats, | |
972 | sizeof(struct mtd_ecc_stats))) | |
973 | return -EFAULT; | |
974 | break; | |
975 | } | |
976 | ||
977 | case MTDFILEMODE: | |
978 | { | |
979 | mfi->mode = 0; | |
980 | ||
981 | switch(arg) { | |
beb133fc BN |
982 | case MTD_FILE_MODE_OTP_FACTORY: |
983 | case MTD_FILE_MODE_OTP_USER: | |
f1a28c02 TG |
984 | ret = otp_select_filemode(mfi, arg); |
985 | break; | |
986 | ||
beb133fc | 987 | case MTD_FILE_MODE_RAW: |
fc002e3c | 988 | if (!mtd_has_oob(mtd)) |
f1a28c02 TG |
989 | return -EOPNOTSUPP; |
990 | mfi->mode = arg; | |
0975b633 | 991 | break; |
f1a28c02 | 992 | |
beb133fc | 993 | case MTD_FILE_MODE_NORMAL: |
f1a28c02 TG |
994 | break; |
995 | default: | |
996 | ret = -EINVAL; | |
997 | } | |
998 | file->f_pos = 0; | |
999 | break; | |
1000 | } | |
1001 | ||
d0f7959e RT |
1002 | case BLKPG: |
1003 | { | |
53bb724f BN |
1004 | struct blkpg_ioctl_arg __user *blk_arg = argp; |
1005 | struct blkpg_ioctl_arg a; | |
1006 | ||
1007 | if (copy_from_user(&a, blk_arg, sizeof(a))) | |
1008 | ret = -EFAULT; | |
1009 | else | |
1010 | ret = mtdchar_blkpg_ioctl(mtd, &a); | |
d0f7959e RT |
1011 | break; |
1012 | } | |
1013 | ||
1014 | case BLKRRPART: | |
1015 | { | |
1016 | /* No reread partition feature. Just return ok */ | |
1017 | ret = 0; | |
1018 | break; | |
1019 | } | |
1da177e4 LT |
1020 | } |
1021 | ||
1022 | return ret; | |
1023 | } /* memory_ioctl */ | |
1024 | ||
969e57ad | 1025 | static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
55929332 | 1026 | { |
1ad55288 AS |
1027 | struct mtd_file_info *mfi = file->private_data; |
1028 | struct mtd_info *mtd = mfi->mtd; | |
1029 | struct mtd_info *master = mtd_get_master(mtd); | |
55929332 AB |
1030 | int ret; |
1031 | ||
1ad55288 | 1032 | mutex_lock(&master->master.chrdev_lock); |
969e57ad | 1033 | ret = mtdchar_ioctl(file, cmd, arg); |
1ad55288 | 1034 | mutex_unlock(&master->master.chrdev_lock); |
55929332 AB |
1035 | |
1036 | return ret; | |
1037 | } | |
1038 | ||
97718540 KC |
1039 | #ifdef CONFIG_COMPAT |
1040 | ||
1041 | struct mtd_oob_buf32 { | |
1042 | u_int32_t start; | |
1043 | u_int32_t length; | |
1044 | compat_caddr_t ptr; /* unsigned char* */ | |
1045 | }; | |
1046 | ||
1047 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
1048 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
1049 | ||
969e57ad | 1050 | static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, |
97718540 KC |
1051 | unsigned long arg) |
1052 | { | |
1053 | struct mtd_file_info *mfi = file->private_data; | |
1054 | struct mtd_info *mtd = mfi->mtd; | |
1ad55288 | 1055 | struct mtd_info *master = mtd_get_master(mtd); |
0b6585ce | 1056 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1057 | int ret = 0; |
1058 | ||
1ad55288 | 1059 | mutex_lock(&master->master.chrdev_lock); |
97718540 KC |
1060 | |
1061 | switch (cmd) { | |
1062 | case MEMWRITEOOB32: | |
1063 | { | |
1064 | struct mtd_oob_buf32 buf; | |
1065 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1066 | ||
f7e6b19b GKH |
1067 | if (!(file->f_mode & FMODE_WRITE)) { |
1068 | ret = -EPERM; | |
1069 | break; | |
1070 | } | |
1071 | ||
97718540 KC |
1072 | if (copy_from_user(&buf, argp, sizeof(buf))) |
1073 | ret = -EFAULT; | |
1074 | else | |
969e57ad | 1075 | ret = mtdchar_writeoob(file, mtd, buf.start, |
97718540 KC |
1076 | buf.length, compat_ptr(buf.ptr), |
1077 | &buf_user->length); | |
1078 | break; | |
1079 | } | |
1080 | ||
1081 | case MEMREADOOB32: | |
1082 | { | |
1083 | struct mtd_oob_buf32 buf; | |
1084 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1085 | ||
1086 | /* NOTE: writes return length to buf->start */ | |
1087 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1088 | ret = -EFAULT; | |
1089 | else | |
969e57ad | 1090 | ret = mtdchar_readoob(file, mtd, buf.start, |
97718540 KC |
1091 | buf.length, compat_ptr(buf.ptr), |
1092 | &buf_user->start); | |
1093 | break; | |
1094 | } | |
53bb724f BN |
1095 | |
1096 | case BLKPG: | |
1097 | { | |
1098 | /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */ | |
1099 | struct blkpg_compat_ioctl_arg __user *uarg = argp; | |
1100 | struct blkpg_compat_ioctl_arg compat_arg; | |
1101 | struct blkpg_ioctl_arg a; | |
1102 | ||
1103 | if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) { | |
1104 | ret = -EFAULT; | |
1105 | break; | |
1106 | } | |
1107 | ||
1108 | memset(&a, 0, sizeof(a)); | |
1109 | a.op = compat_arg.op; | |
1110 | a.flags = compat_arg.flags; | |
1111 | a.datalen = compat_arg.datalen; | |
1112 | a.data = compat_ptr(compat_arg.data); | |
1113 | ||
1114 | ret = mtdchar_blkpg_ioctl(mtd, &a); | |
1115 | break; | |
1116 | } | |
1117 | ||
97718540 | 1118 | default: |
969e57ad | 1119 | ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1120 | } |
1121 | ||
1ad55288 | 1122 | mutex_unlock(&master->master.chrdev_lock); |
97718540 KC |
1123 | |
1124 | return ret; | |
1125 | } | |
1126 | ||
1127 | #endif /* CONFIG_COMPAT */ | |
1128 | ||
402d3265 DH |
1129 | /* |
1130 | * try to determine where a shared mapping can be made | |
1131 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1132 | * mappings) | |
1133 | */ | |
1134 | #ifndef CONFIG_MMU | |
969e57ad | 1135 | static unsigned long mtdchar_get_unmapped_area(struct file *file, |
402d3265 DH |
1136 | unsigned long addr, |
1137 | unsigned long len, | |
1138 | unsigned long pgoff, | |
1139 | unsigned long flags) | |
1140 | { | |
1141 | struct mtd_file_info *mfi = file->private_data; | |
1142 | struct mtd_info *mtd = mfi->mtd; | |
cd621274 AB |
1143 | unsigned long offset; |
1144 | int ret; | |
402d3265 | 1145 | |
cd621274 AB |
1146 | if (addr != 0) |
1147 | return (unsigned long) -EINVAL; | |
402d3265 | 1148 | |
cd621274 AB |
1149 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) |
1150 | return (unsigned long) -EINVAL; | |
402d3265 | 1151 | |
cd621274 AB |
1152 | offset = pgoff << PAGE_SHIFT; |
1153 | if (offset > mtd->size - len) | |
1154 | return (unsigned long) -EINVAL; | |
402d3265 | 1155 | |
cd621274 | 1156 | ret = mtd_get_unmapped_area(mtd, len, offset, flags); |
b9995932 | 1157 | return ret == -EOPNOTSUPP ? -ENODEV : ret; |
402d3265 | 1158 | } |
b4caecd4 CH |
1159 | |
1160 | static unsigned mtdchar_mmap_capabilities(struct file *file) | |
1161 | { | |
1162 | struct mtd_file_info *mfi = file->private_data; | |
1163 | ||
1164 | return mtd_mmap_capabilities(mfi->mtd); | |
1165 | } | |
402d3265 DH |
1166 | #endif |
1167 | ||
1168 | /* | |
1169 | * set up a mapping for shared memory segments | |
1170 | */ | |
969e57ad | 1171 | static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) |
402d3265 DH |
1172 | { |
1173 | #ifdef CONFIG_MMU | |
1174 | struct mtd_file_info *mfi = file->private_data; | |
1175 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d | 1176 | struct map_info *map = mtd->priv; |
dd02b67d | 1177 | |
f5cf8f07 DW |
1178 | /* This is broken because it assumes the MTD device is map-based |
1179 | and that mtd->priv is a valid struct map_info. It should be | |
1180 | replaced with something that uses the mtd_get_unmapped_area() | |
1181 | operation properly. */ | |
1182 | if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { | |
dd02b67d | 1183 | #ifdef pgprot_noncached |
8558e4a2 | 1184 | if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) |
dd02b67d AG |
1185 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1186 | #endif | |
8558e4a2 | 1187 | return vm_iomap_memory(vma, map->phys, map->size); |
dd02b67d | 1188 | } |
b9995932 | 1189 | return -ENODEV; |
402d3265 | 1190 | #else |
b9995932 | 1191 | return vma->vm_flags & VM_SHARED ? 0 : -EACCES; |
402d3265 DH |
1192 | #endif |
1193 | } | |
1194 | ||
d54b1fdb | 1195 | static const struct file_operations mtd_fops = { |
1da177e4 | 1196 | .owner = THIS_MODULE, |
969e57ad AB |
1197 | .llseek = mtdchar_lseek, |
1198 | .read = mtdchar_read, | |
1199 | .write = mtdchar_write, | |
1200 | .unlocked_ioctl = mtdchar_unlocked_ioctl, | |
97718540 | 1201 | #ifdef CONFIG_COMPAT |
969e57ad | 1202 | .compat_ioctl = mtdchar_compat_ioctl, |
97718540 | 1203 | #endif |
969e57ad AB |
1204 | .open = mtdchar_open, |
1205 | .release = mtdchar_close, | |
1206 | .mmap = mtdchar_mmap, | |
402d3265 | 1207 | #ifndef CONFIG_MMU |
969e57ad | 1208 | .get_unmapped_area = mtdchar_get_unmapped_area, |
b4caecd4 | 1209 | .mmap_capabilities = mtdchar_mmap_capabilities, |
402d3265 | 1210 | #endif |
1da177e4 LT |
1211 | }; |
1212 | ||
660685d9 | 1213 | int __init init_mtdchar(void) |
1da177e4 | 1214 | { |
cd874237 | 1215 | int ret; |
1f24b5a8 | 1216 | |
cd874237 | 1217 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1218 | "mtd", &mtd_fops); |
cd874237 | 1219 | if (ret < 0) { |
57ae2b60 AB |
1220 | pr_err("Can't allocate major number %d for MTD\n", |
1221 | MTD_CHAR_MAJOR); | |
cd874237 | 1222 | return ret; |
9bc7b387 TP |
1223 | } |
1224 | ||
cd874237 | 1225 | return ret; |
1da177e4 LT |
1226 | } |
1227 | ||
660685d9 | 1228 | void __exit cleanup_mtdchar(void) |
1da177e4 | 1229 | { |
dad0db31 | 1230 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1231 | } |
1232 | ||
90160e13 | 1233 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |