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 | ||
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 TG |
176 | { |
177 | struct mtd_oob_ops ops; | |
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 TG |
270 | { |
271 | struct mtd_oob_ops ops; | |
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 | { | |
9ce244b3 | 352 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
353 | struct mtd_oob_ops ops; |
354 | uint32_t retlen; | |
355 | int ret = 0; | |
356 | ||
357 | if (!(file->f_mode & FMODE_WRITE)) | |
358 | return -EPERM; | |
359 | ||
360 | if (length > 4096) | |
361 | return -EINVAL; | |
362 | ||
3c3c10bb | 363 | if (!mtd->_write_oob) |
0db188f9 | 364 | return -EOPNOTSUPP; |
97718540 KC |
365 | |
366 | ops.ooblen = length; | |
305b93f1 | 367 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 368 | ops.datbuf = NULL; |
beb133fc | 369 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 370 | MTD_OPS_PLACE_OOB; |
97718540 KC |
371 | |
372 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
373 | return -EINVAL; | |
374 | ||
df1f1d1c JL |
375 | ops.oobbuf = memdup_user(ptr, length); |
376 | if (IS_ERR(ops.oobbuf)) | |
377 | return PTR_ERR(ops.oobbuf); | |
97718540 | 378 | |
305b93f1 | 379 | start &= ~((uint64_t)mtd->writesize - 1); |
a2cc5ba0 | 380 | ret = mtd_write_oob(mtd, start, &ops); |
97718540 KC |
381 | |
382 | if (ops.oobretlen > 0xFFFFFFFFU) | |
383 | ret = -EOVERFLOW; | |
384 | retlen = ops.oobretlen; | |
385 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
386 | ret = -EFAULT; | |
387 | ||
388 | kfree(ops.oobbuf); | |
389 | return ret; | |
390 | } | |
391 | ||
969e57ad | 392 | static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
c46f6483 BN |
393 | uint64_t start, uint32_t length, void __user *ptr, |
394 | uint32_t __user *retp) | |
97718540 | 395 | { |
c46f6483 | 396 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
397 | struct mtd_oob_ops ops; |
398 | int ret = 0; | |
399 | ||
400 | if (length > 4096) | |
401 | return -EINVAL; | |
402 | ||
97718540 | 403 | ops.ooblen = length; |
305b93f1 | 404 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 405 | ops.datbuf = NULL; |
beb133fc | 406 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 407 | MTD_OPS_PLACE_OOB; |
97718540 KC |
408 | |
409 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
410 | return -EINVAL; | |
411 | ||
412 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
413 | if (!ops.oobbuf) | |
414 | return -ENOMEM; | |
415 | ||
305b93f1 | 416 | start &= ~((uint64_t)mtd->writesize - 1); |
fd2819bb | 417 | ret = mtd_read_oob(mtd, start, &ops); |
97718540 KC |
418 | |
419 | if (put_user(ops.oobretlen, retp)) | |
420 | ret = -EFAULT; | |
421 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
422 | ops.oobretlen)) | |
423 | ret = -EFAULT; | |
424 | ||
425 | kfree(ops.oobbuf); | |
041e4575 BN |
426 | |
427 | /* | |
428 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
429 | * data. For our userspace tools it is important to dump areas | |
430 | * with ECC errors! | |
431 | * For kernel internal usage it also might return -EUCLEAN | |
5d708ecc | 432 | * to signal the caller that a bitflip has occurred and has |
041e4575 BN |
433 | * been corrected by the ECC algorithm. |
434 | * | |
c478d7e4 BN |
435 | * Note: currently the standard NAND function, nand_read_oob_std, |
436 | * does not calculate ECC for the OOB area, so do not rely on | |
437 | * this behavior unless you have replaced it with your own. | |
041e4575 | 438 | */ |
d57f4054 | 439 | if (mtd_is_bitflip_or_eccerr(ret)) |
041e4575 BN |
440 | return 0; |
441 | ||
97718540 KC |
442 | return ret; |
443 | } | |
444 | ||
cc26c3cd | 445 | /* |
aab616e3 BB |
446 | * Copies (and truncates, if necessary) OOB layout information to the |
447 | * deprecated layout struct, nand_ecclayout_user. This is necessary only to | |
448 | * support the deprecated API ioctl ECCGETLAYOUT while allowing all new | |
449 | * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops | |
450 | * can describe any kind of OOB layout with almost zero overhead from a | |
451 | * memory usage point of view). | |
cc26c3cd | 452 | */ |
c2b78452 BB |
453 | static int shrink_ecclayout(struct mtd_info *mtd, |
454 | struct nand_ecclayout_user *to) | |
cc26c3cd | 455 | { |
c2b78452 BB |
456 | struct mtd_oob_region oobregion; |
457 | int i, section = 0, ret; | |
cc26c3cd | 458 | |
c2b78452 | 459 | if (!mtd || !to) |
cc26c3cd BN |
460 | return -EINVAL; |
461 | ||
462 | memset(to, 0, sizeof(*to)); | |
463 | ||
c2b78452 BB |
464 | to->eccbytes = 0; |
465 | for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) { | |
466 | u32 eccpos; | |
467 | ||
6de56493 | 468 | ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
c2b78452 BB |
469 | if (ret < 0) { |
470 | if (ret != -ERANGE) | |
471 | return ret; | |
472 | ||
473 | break; | |
474 | } | |
475 | ||
476 | eccpos = oobregion.offset; | |
477 | for (; i < MTD_MAX_ECCPOS_ENTRIES && | |
478 | eccpos < oobregion.offset + oobregion.length; i++) { | |
479 | to->eccpos[i] = eccpos++; | |
480 | to->eccbytes++; | |
481 | } | |
482 | } | |
cc26c3cd BN |
483 | |
484 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
c2b78452 BB |
485 | ret = mtd_ooblayout_free(mtd, i, &oobregion); |
486 | if (ret < 0) { | |
487 | if (ret != -ERANGE) | |
488 | return ret; | |
489 | ||
490 | break; | |
491 | } | |
492 | ||
493 | to->oobfree[i].offset = oobregion.offset; | |
494 | to->oobfree[i].length = oobregion.length; | |
495 | to->oobavail += to->oobfree[i].length; | |
496 | } | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to) | |
502 | { | |
503 | struct mtd_oob_region oobregion; | |
504 | int i, section = 0, ret; | |
505 | ||
506 | if (!mtd || !to) | |
507 | return -EINVAL; | |
508 | ||
509 | memset(to, 0, sizeof(*to)); | |
510 | ||
511 | to->eccbytes = 0; | |
512 | for (i = 0; i < ARRAY_SIZE(to->eccpos);) { | |
513 | u32 eccpos; | |
514 | ||
6de56493 | 515 | ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
c2b78452 BB |
516 | if (ret < 0) { |
517 | if (ret != -ERANGE) | |
518 | return ret; | |
519 | ||
cc26c3cd | 520 | break; |
c2b78452 BB |
521 | } |
522 | ||
523 | if (oobregion.length + i > ARRAY_SIZE(to->eccpos)) | |
524 | return -EINVAL; | |
525 | ||
526 | eccpos = oobregion.offset; | |
527 | for (; eccpos < oobregion.offset + oobregion.length; i++) { | |
528 | to->eccpos[i] = eccpos++; | |
529 | to->eccbytes++; | |
530 | } | |
cc26c3cd BN |
531 | } |
532 | ||
c2b78452 BB |
533 | for (i = 0; i < 8; i++) { |
534 | ret = mtd_ooblayout_free(mtd, i, &oobregion); | |
535 | if (ret < 0) { | |
536 | if (ret != -ERANGE) | |
537 | return ret; | |
538 | ||
539 | break; | |
540 | } | |
541 | ||
542 | to->oobfree[i][0] = oobregion.offset; | |
543 | to->oobfree[i][1] = oobregion.length; | |
544 | } | |
545 | ||
546 | to->useecc = MTD_NANDECC_AUTOPLACE; | |
547 | ||
cc26c3cd BN |
548 | return 0; |
549 | } | |
550 | ||
969e57ad | 551 | static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
53bb724f | 552 | struct blkpg_ioctl_arg *arg) |
d0f7959e | 553 | { |
d0f7959e RT |
554 | struct blkpg_partition p; |
555 | ||
556 | if (!capable(CAP_SYS_ADMIN)) | |
557 | return -EPERM; | |
558 | ||
53bb724f | 559 | if (copy_from_user(&p, arg->data, sizeof(p))) |
d0f7959e RT |
560 | return -EFAULT; |
561 | ||
53bb724f | 562 | switch (arg->op) { |
d0f7959e RT |
563 | case BLKPG_ADD_PARTITION: |
564 | ||
a7e93dcd RT |
565 | /* Only master mtd device must be used to add partitions */ |
566 | if (mtd_is_partition(mtd)) | |
567 | return -EINVAL; | |
568 | ||
1cc8d841 BN |
569 | /* Sanitize user input */ |
570 | p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; | |
571 | ||
d0f7959e RT |
572 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
573 | ||
574 | case BLKPG_DEL_PARTITION: | |
575 | ||
576 | if (p.pno < 0) | |
577 | return -EINVAL; | |
578 | ||
579 | return mtd_del_partition(mtd, p.pno); | |
580 | ||
581 | default: | |
582 | return -EINVAL; | |
583 | } | |
584 | } | |
d0f7959e | 585 | |
969e57ad | 586 | static int mtdchar_write_ioctl(struct mtd_info *mtd, |
e99d8b08 BN |
587 | struct mtd_write_req __user *argp) |
588 | { | |
589 | struct mtd_write_req req; | |
590 | struct mtd_oob_ops ops; | |
f62cde49 | 591 | const void __user *usr_data, *usr_oob; |
e99d8b08 BN |
592 | int ret; |
593 | ||
f62cde49 | 594 | if (copy_from_user(&req, argp, sizeof(req))) |
e99d8b08 | 595 | return -EFAULT; |
f62cde49 GU |
596 | |
597 | usr_data = (const void __user *)(uintptr_t)req.usr_data; | |
598 | usr_oob = (const void __user *)(uintptr_t)req.usr_oob; | |
f62cde49 | 599 | |
3c3c10bb | 600 | if (!mtd->_write_oob) |
e99d8b08 BN |
601 | return -EOPNOTSUPP; |
602 | ||
603 | ops.mode = req.mode; | |
604 | ops.len = (size_t)req.len; | |
605 | ops.ooblen = (size_t)req.ooblen; | |
606 | ops.ooboffs = 0; | |
607 | ||
f62cde49 | 608 | if (usr_data) { |
e99d8b08 BN |
609 | ops.datbuf = memdup_user(usr_data, ops.len); |
610 | if (IS_ERR(ops.datbuf)) | |
611 | return PTR_ERR(ops.datbuf); | |
612 | } else { | |
613 | ops.datbuf = NULL; | |
614 | } | |
615 | ||
f62cde49 | 616 | if (usr_oob) { |
e99d8b08 BN |
617 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); |
618 | if (IS_ERR(ops.oobbuf)) { | |
619 | kfree(ops.datbuf); | |
620 | return PTR_ERR(ops.oobbuf); | |
621 | } | |
622 | } else { | |
623 | ops.oobbuf = NULL; | |
624 | } | |
625 | ||
a2cc5ba0 | 626 | ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
e99d8b08 BN |
627 | |
628 | kfree(ops.datbuf); | |
629 | kfree(ops.oobbuf); | |
630 | ||
631 | return ret; | |
632 | } | |
633 | ||
969e57ad | 634 | static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 635 | { |
f1a28c02 TG |
636 | struct mtd_file_info *mfi = file->private_data; |
637 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
638 | void __user *argp = (void __user *)arg; |
639 | int ret = 0; | |
73c619ea | 640 | struct mtd_info_user info; |
97894cda | 641 | |
289c0522 | 642 | pr_debug("MTD_ioctl\n"); |
1da177e4 | 643 | |
1da177e4 LT |
644 | switch (cmd) { |
645 | case MEMGETREGIONCOUNT: | |
646 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
647 | return -EFAULT; | |
648 | break; | |
649 | ||
650 | case MEMGETREGIONINFO: | |
651 | { | |
b67c5f87 ZW |
652 | uint32_t ur_idx; |
653 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 654 | struct region_info_user __user *ur = argp; |
1da177e4 | 655 | |
b67c5f87 | 656 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
657 | return -EFAULT; |
658 | ||
5e59be1f DC |
659 | if (ur_idx >= mtd->numeraseregions) |
660 | return -EINVAL; | |
661 | ||
b67c5f87 ZW |
662 | kr = &(mtd->eraseregions[ur_idx]); |
663 | ||
664 | if (put_user(kr->offset, &(ur->offset)) | |
665 | || put_user(kr->erasesize, &(ur->erasesize)) | |
666 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 667 | return -EFAULT; |
b67c5f87 | 668 | |
1da177e4 LT |
669 | break; |
670 | } | |
671 | ||
672 | case MEMGETINFO: | |
a0c5a394 | 673 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
674 | info.type = mtd->type; |
675 | info.flags = mtd->flags; | |
676 | info.size = mtd->size; | |
677 | info.erasesize = mtd->erasesize; | |
678 | info.writesize = mtd->writesize; | |
679 | info.oobsize = mtd->oobsize; | |
19fb4341 BN |
680 | /* The below field is obsolete */ |
681 | info.padding = 0; | |
73c619ea | 682 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
683 | return -EFAULT; |
684 | break; | |
685 | ||
686 | case MEMERASE: | |
0dc54e9f | 687 | case MEMERASE64: |
1da177e4 LT |
688 | { |
689 | struct erase_info *erase; | |
690 | ||
aeb5d727 | 691 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
692 | return -EPERM; |
693 | ||
95b93a0c | 694 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
695 | if (!erase) |
696 | ret = -ENOMEM; | |
697 | else { | |
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 | 718 | } |
884cfd90 | 719 | |
7e1f0dc0 | 720 | ret = mtd_erase(mtd, erase); |
1da177e4 LT |
721 | kfree(erase); |
722 | } | |
723 | break; | |
724 | } | |
725 | ||
726 | case MEMWRITEOOB: | |
727 | { | |
728 | struct mtd_oob_buf buf; | |
97718540 | 729 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 730 | |
97718540 KC |
731 | /* NOTE: writes return length to buf_user->length */ |
732 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 733 | ret = -EFAULT; |
97718540 | 734 | else |
969e57ad | 735 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
97718540 | 736 | buf.ptr, &buf_user->length); |
1da177e4 | 737 | break; |
1da177e4 LT |
738 | } |
739 | ||
740 | case MEMREADOOB: | |
741 | { | |
742 | struct mtd_oob_buf buf; | |
97718540 | 743 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 744 | |
97718540 KC |
745 | /* NOTE: writes return length to buf_user->start */ |
746 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 747 | ret = -EFAULT; |
97718540 | 748 | else |
969e57ad | 749 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
97718540 | 750 | buf.ptr, &buf_user->start); |
1da177e4 LT |
751 | break; |
752 | } | |
753 | ||
aea7cea9 KC |
754 | case MEMWRITEOOB64: |
755 | { | |
756 | struct mtd_oob_buf64 buf; | |
757 | struct mtd_oob_buf64 __user *buf_user = argp; | |
758 | ||
759 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
760 | ret = -EFAULT; | |
761 | else | |
969e57ad | 762 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
763 | (void __user *)(uintptr_t)buf.usr_ptr, |
764 | &buf_user->length); | |
765 | break; | |
766 | } | |
767 | ||
768 | case MEMREADOOB64: | |
769 | { | |
770 | struct mtd_oob_buf64 buf; | |
771 | struct mtd_oob_buf64 __user *buf_user = argp; | |
772 | ||
773 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
774 | ret = -EFAULT; | |
775 | else | |
969e57ad | 776 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
777 | (void __user *)(uintptr_t)buf.usr_ptr, |
778 | &buf_user->length); | |
779 | break; | |
780 | } | |
781 | ||
e99d8b08 BN |
782 | case MEMWRITE: |
783 | { | |
969e57ad | 784 | ret = mtdchar_write_ioctl(mtd, |
e99d8b08 BN |
785 | (struct mtd_write_req __user *)arg); |
786 | break; | |
787 | } | |
788 | ||
1da177e4 LT |
789 | case MEMLOCK: |
790 | { | |
175428b2 | 791 | struct erase_info_user einfo; |
1da177e4 | 792 | |
175428b2 | 793 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
794 | return -EFAULT; |
795 | ||
38134565 | 796 | ret = mtd_lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
797 | break; |
798 | } | |
799 | ||
800 | case MEMUNLOCK: | |
801 | { | |
175428b2 | 802 | struct erase_info_user einfo; |
1da177e4 | 803 | |
175428b2 | 804 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
805 | return -EFAULT; |
806 | ||
38134565 | 807 | ret = mtd_unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
808 | break; |
809 | } | |
810 | ||
9938424f RC |
811 | case MEMISLOCKED: |
812 | { | |
813 | struct erase_info_user einfo; | |
814 | ||
815 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
816 | return -EFAULT; | |
817 | ||
38134565 | 818 | ret = mtd_is_locked(mtd, einfo.start, einfo.length); |
9938424f RC |
819 | break; |
820 | } | |
821 | ||
5bd34c09 | 822 | /* Legacy interface */ |
1da177e4 LT |
823 | case MEMGETOOBSEL: |
824 | { | |
5bd34c09 TG |
825 | struct nand_oobinfo oi; |
826 | ||
adbbc3bc | 827 | if (!mtd->ooblayout) |
5bd34c09 | 828 | return -EOPNOTSUPP; |
5bd34c09 | 829 | |
c2b78452 BB |
830 | ret = get_oobinfo(mtd, &oi); |
831 | if (ret) | |
832 | return ret; | |
5bd34c09 TG |
833 | |
834 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
835 | return -EFAULT; |
836 | break; | |
837 | } | |
838 | ||
839 | case MEMGETBADBLOCK: | |
840 | { | |
841 | loff_t offs; | |
97894cda | 842 | |
1da177e4 LT |
843 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
844 | return -EFAULT; | |
8f461a73 | 845 | return mtd_block_isbad(mtd, offs); |
1da177e4 LT |
846 | break; |
847 | } | |
848 | ||
849 | case MEMSETBADBLOCK: | |
850 | { | |
851 | loff_t offs; | |
852 | ||
853 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
854 | return -EFAULT; | |
800ffd34 | 855 | return mtd_block_markbad(mtd, offs); |
1da177e4 LT |
856 | break; |
857 | } | |
858 | ||
31f4233b NP |
859 | case OTPSELECT: |
860 | { | |
861 | int mode; | |
862 | if (copy_from_user(&mode, argp, sizeof(int))) | |
863 | return -EFAULT; | |
f1a28c02 | 864 | |
beb133fc | 865 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 TG |
866 | |
867 | ret = otp_select_filemode(mfi, mode); | |
868 | ||
81dba488 | 869 | file->f_pos = 0; |
31f4233b NP |
870 | break; |
871 | } | |
872 | ||
873 | case OTPGETREGIONCOUNT: | |
874 | case OTPGETREGIONINFO: | |
875 | { | |
876 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
4b78fc42 | 877 | size_t retlen; |
31f4233b NP |
878 | if (!buf) |
879 | return -ENOMEM; | |
f1a28c02 | 880 | switch (mfi->mode) { |
beb133fc | 881 | case MTD_FILE_MODE_OTP_FACTORY: |
4b78fc42 | 882 | ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf); |
31f4233b | 883 | break; |
beb133fc | 884 | case MTD_FILE_MODE_OTP_USER: |
4b78fc42 | 885 | ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf); |
31f4233b | 886 | break; |
f1a28c02 | 887 | default: |
87e858a9 | 888 | ret = -EINVAL; |
f1a28c02 | 889 | break; |
31f4233b | 890 | } |
4b78fc42 | 891 | if (!ret) { |
31f4233b | 892 | if (cmd == OTPGETREGIONCOUNT) { |
4b78fc42 | 893 | int nbr = retlen / sizeof(struct otp_info); |
31f4233b NP |
894 | ret = copy_to_user(argp, &nbr, sizeof(int)); |
895 | } else | |
4b78fc42 | 896 | ret = copy_to_user(argp, buf, retlen); |
31f4233b NP |
897 | if (ret) |
898 | ret = -EFAULT; | |
899 | } | |
900 | kfree(buf); | |
901 | break; | |
902 | } | |
903 | ||
904 | case OTPLOCK: | |
905 | { | |
175428b2 | 906 | struct otp_info oinfo; |
31f4233b | 907 | |
beb133fc | 908 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
31f4233b | 909 | return -EINVAL; |
175428b2 | 910 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b | 911 | return -EFAULT; |
4403dbfb | 912 | ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
913 | break; |
914 | } | |
31f4233b | 915 | |
7854d3f7 | 916 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
917 | case ECCGETLAYOUT: |
918 | { | |
cc26c3cd BN |
919 | struct nand_ecclayout_user *usrlay; |
920 | ||
adbbc3bc | 921 | if (!mtd->ooblayout) |
f1a28c02 TG |
922 | return -EOPNOTSUPP; |
923 | ||
cc26c3cd BN |
924 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
925 | if (!usrlay) | |
926 | return -ENOMEM; | |
927 | ||
c2b78452 | 928 | shrink_ecclayout(mtd, usrlay); |
cc26c3cd BN |
929 | |
930 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
931 | ret = -EFAULT; | |
932 | kfree(usrlay); | |
f1a28c02 TG |
933 | break; |
934 | } | |
935 | ||
936 | case ECCGETSTATS: | |
937 | { | |
938 | if (copy_to_user(argp, &mtd->ecc_stats, | |
939 | sizeof(struct mtd_ecc_stats))) | |
940 | return -EFAULT; | |
941 | break; | |
942 | } | |
943 | ||
944 | case MTDFILEMODE: | |
945 | { | |
946 | mfi->mode = 0; | |
947 | ||
948 | switch(arg) { | |
beb133fc BN |
949 | case MTD_FILE_MODE_OTP_FACTORY: |
950 | case MTD_FILE_MODE_OTP_USER: | |
f1a28c02 TG |
951 | ret = otp_select_filemode(mfi, arg); |
952 | break; | |
953 | ||
beb133fc | 954 | case MTD_FILE_MODE_RAW: |
fc002e3c | 955 | if (!mtd_has_oob(mtd)) |
f1a28c02 TG |
956 | return -EOPNOTSUPP; |
957 | mfi->mode = arg; | |
958 | ||
beb133fc | 959 | case MTD_FILE_MODE_NORMAL: |
f1a28c02 TG |
960 | break; |
961 | default: | |
962 | ret = -EINVAL; | |
963 | } | |
964 | file->f_pos = 0; | |
965 | break; | |
966 | } | |
967 | ||
d0f7959e RT |
968 | case BLKPG: |
969 | { | |
53bb724f BN |
970 | struct blkpg_ioctl_arg __user *blk_arg = argp; |
971 | struct blkpg_ioctl_arg a; | |
972 | ||
973 | if (copy_from_user(&a, blk_arg, sizeof(a))) | |
974 | ret = -EFAULT; | |
975 | else | |
976 | ret = mtdchar_blkpg_ioctl(mtd, &a); | |
d0f7959e RT |
977 | break; |
978 | } | |
979 | ||
980 | case BLKRRPART: | |
981 | { | |
982 | /* No reread partition feature. Just return ok */ | |
983 | ret = 0; | |
984 | break; | |
985 | } | |
d0f7959e | 986 | |
1da177e4 LT |
987 | default: |
988 | ret = -ENOTTY; | |
989 | } | |
990 | ||
991 | return ret; | |
992 | } /* memory_ioctl */ | |
993 | ||
969e57ad | 994 | static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
55929332 AB |
995 | { |
996 | int ret; | |
997 | ||
5aa82940 | 998 | mutex_lock(&mtd_mutex); |
969e57ad | 999 | ret = mtdchar_ioctl(file, cmd, arg); |
5aa82940 | 1000 | mutex_unlock(&mtd_mutex); |
55929332 AB |
1001 | |
1002 | return ret; | |
1003 | } | |
1004 | ||
97718540 KC |
1005 | #ifdef CONFIG_COMPAT |
1006 | ||
1007 | struct mtd_oob_buf32 { | |
1008 | u_int32_t start; | |
1009 | u_int32_t length; | |
1010 | compat_caddr_t ptr; /* unsigned char* */ | |
1011 | }; | |
1012 | ||
1013 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
1014 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
1015 | ||
969e57ad | 1016 | static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, |
97718540 KC |
1017 | unsigned long arg) |
1018 | { | |
1019 | struct mtd_file_info *mfi = file->private_data; | |
1020 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 1021 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1022 | int ret = 0; |
1023 | ||
5aa82940 | 1024 | mutex_lock(&mtd_mutex); |
97718540 KC |
1025 | |
1026 | switch (cmd) { | |
1027 | case MEMWRITEOOB32: | |
1028 | { | |
1029 | struct mtd_oob_buf32 buf; | |
1030 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1031 | ||
1032 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1033 | ret = -EFAULT; | |
1034 | else | |
969e57ad | 1035 | ret = mtdchar_writeoob(file, mtd, buf.start, |
97718540 KC |
1036 | buf.length, compat_ptr(buf.ptr), |
1037 | &buf_user->length); | |
1038 | break; | |
1039 | } | |
1040 | ||
1041 | case MEMREADOOB32: | |
1042 | { | |
1043 | struct mtd_oob_buf32 buf; | |
1044 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1045 | ||
1046 | /* NOTE: writes return length to buf->start */ | |
1047 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1048 | ret = -EFAULT; | |
1049 | else | |
969e57ad | 1050 | ret = mtdchar_readoob(file, mtd, buf.start, |
97718540 KC |
1051 | buf.length, compat_ptr(buf.ptr), |
1052 | &buf_user->start); | |
1053 | break; | |
1054 | } | |
53bb724f BN |
1055 | |
1056 | case BLKPG: | |
1057 | { | |
1058 | /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */ | |
1059 | struct blkpg_compat_ioctl_arg __user *uarg = argp; | |
1060 | struct blkpg_compat_ioctl_arg compat_arg; | |
1061 | struct blkpg_ioctl_arg a; | |
1062 | ||
1063 | if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) { | |
1064 | ret = -EFAULT; | |
1065 | break; | |
1066 | } | |
1067 | ||
1068 | memset(&a, 0, sizeof(a)); | |
1069 | a.op = compat_arg.op; | |
1070 | a.flags = compat_arg.flags; | |
1071 | a.datalen = compat_arg.datalen; | |
1072 | a.data = compat_ptr(compat_arg.data); | |
1073 | ||
1074 | ret = mtdchar_blkpg_ioctl(mtd, &a); | |
1075 | break; | |
1076 | } | |
1077 | ||
97718540 | 1078 | default: |
969e57ad | 1079 | ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1080 | } |
1081 | ||
5aa82940 | 1082 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1083 | |
1084 | return ret; | |
1085 | } | |
1086 | ||
1087 | #endif /* CONFIG_COMPAT */ | |
1088 | ||
402d3265 DH |
1089 | /* |
1090 | * try to determine where a shared mapping can be made | |
1091 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1092 | * mappings) | |
1093 | */ | |
1094 | #ifndef CONFIG_MMU | |
969e57ad | 1095 | static unsigned long mtdchar_get_unmapped_area(struct file *file, |
402d3265 DH |
1096 | unsigned long addr, |
1097 | unsigned long len, | |
1098 | unsigned long pgoff, | |
1099 | unsigned long flags) | |
1100 | { | |
1101 | struct mtd_file_info *mfi = file->private_data; | |
1102 | struct mtd_info *mtd = mfi->mtd; | |
cd621274 AB |
1103 | unsigned long offset; |
1104 | int ret; | |
402d3265 | 1105 | |
cd621274 AB |
1106 | if (addr != 0) |
1107 | return (unsigned long) -EINVAL; | |
402d3265 | 1108 | |
cd621274 AB |
1109 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) |
1110 | return (unsigned long) -EINVAL; | |
402d3265 | 1111 | |
cd621274 AB |
1112 | offset = pgoff << PAGE_SHIFT; |
1113 | if (offset > mtd->size - len) | |
1114 | return (unsigned long) -EINVAL; | |
402d3265 | 1115 | |
cd621274 | 1116 | ret = mtd_get_unmapped_area(mtd, len, offset, flags); |
b9995932 | 1117 | return ret == -EOPNOTSUPP ? -ENODEV : ret; |
402d3265 | 1118 | } |
b4caecd4 CH |
1119 | |
1120 | static unsigned mtdchar_mmap_capabilities(struct file *file) | |
1121 | { | |
1122 | struct mtd_file_info *mfi = file->private_data; | |
1123 | ||
1124 | return mtd_mmap_capabilities(mfi->mtd); | |
1125 | } | |
402d3265 DH |
1126 | #endif |
1127 | ||
1128 | /* | |
1129 | * set up a mapping for shared memory segments | |
1130 | */ | |
969e57ad | 1131 | static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) |
402d3265 DH |
1132 | { |
1133 | #ifdef CONFIG_MMU | |
1134 | struct mtd_file_info *mfi = file->private_data; | |
1135 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d | 1136 | struct map_info *map = mtd->priv; |
dd02b67d | 1137 | |
f5cf8f07 DW |
1138 | /* This is broken because it assumes the MTD device is map-based |
1139 | and that mtd->priv is a valid struct map_info. It should be | |
1140 | replaced with something that uses the mtd_get_unmapped_area() | |
1141 | operation properly. */ | |
1142 | if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { | |
dd02b67d | 1143 | #ifdef pgprot_noncached |
8558e4a2 | 1144 | if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) |
dd02b67d AG |
1145 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1146 | #endif | |
8558e4a2 | 1147 | return vm_iomap_memory(vma, map->phys, map->size); |
dd02b67d | 1148 | } |
b9995932 | 1149 | return -ENODEV; |
402d3265 | 1150 | #else |
b9995932 | 1151 | return vma->vm_flags & VM_SHARED ? 0 : -EACCES; |
402d3265 DH |
1152 | #endif |
1153 | } | |
1154 | ||
d54b1fdb | 1155 | static const struct file_operations mtd_fops = { |
1da177e4 | 1156 | .owner = THIS_MODULE, |
969e57ad AB |
1157 | .llseek = mtdchar_lseek, |
1158 | .read = mtdchar_read, | |
1159 | .write = mtdchar_write, | |
1160 | .unlocked_ioctl = mtdchar_unlocked_ioctl, | |
97718540 | 1161 | #ifdef CONFIG_COMPAT |
969e57ad | 1162 | .compat_ioctl = mtdchar_compat_ioctl, |
97718540 | 1163 | #endif |
969e57ad AB |
1164 | .open = mtdchar_open, |
1165 | .release = mtdchar_close, | |
1166 | .mmap = mtdchar_mmap, | |
402d3265 | 1167 | #ifndef CONFIG_MMU |
969e57ad | 1168 | .get_unmapped_area = mtdchar_get_unmapped_area, |
b4caecd4 | 1169 | .mmap_capabilities = mtdchar_mmap_capabilities, |
402d3265 | 1170 | #endif |
1da177e4 LT |
1171 | }; |
1172 | ||
660685d9 | 1173 | int __init init_mtdchar(void) |
1da177e4 | 1174 | { |
cd874237 | 1175 | int ret; |
1f24b5a8 | 1176 | |
cd874237 | 1177 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1178 | "mtd", &mtd_fops); |
cd874237 | 1179 | if (ret < 0) { |
57ae2b60 AB |
1180 | pr_err("Can't allocate major number %d for MTD\n", |
1181 | MTD_CHAR_MAJOR); | |
cd874237 | 1182 | return ret; |
9bc7b387 TP |
1183 | } |
1184 | ||
cd874237 | 1185 | return ret; |
1da177e4 LT |
1186 | } |
1187 | ||
660685d9 | 1188 | void __exit cleanup_mtdchar(void) |
1da177e4 | 1189 | { |
dad0db31 | 1190 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1191 | } |
1192 | ||
90160e13 | 1193 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |