Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
a1452a37 DW |
2 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 LT |
17 | * |
18 | */ | |
19 | ||
15fdc52f TG |
20 | #include <linux/device.h> |
21 | #include <linux/fs.h> | |
0c1eafdb | 22 | #include <linux/mm.h> |
9c74034f | 23 | #include <linux/err.h> |
15fdc52f | 24 | #include <linux/init.h> |
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> | |
15fdc52f TG |
27 | #include <linux/slab.h> |
28 | #include <linux/sched.h> | |
5aa82940 | 29 | #include <linux/mutex.h> |
402d3265 | 30 | #include <linux/backing-dev.h> |
97718540 | 31 | #include <linux/compat.h> |
cd874237 | 32 | #include <linux/mount.h> |
d0f7959e | 33 | #include <linux/blkpg.h> |
b502bd11 | 34 | #include <linux/magic.h> |
f83c3838 | 35 | #include <linux/major.h> |
1da177e4 | 36 | #include <linux/mtd/mtd.h> |
d0f7959e | 37 | #include <linux/mtd/partitions.h> |
dd02b67d | 38 | #include <linux/mtd/map.h> |
1da177e4 | 39 | |
15fdc52f | 40 | #include <asm/uaccess.h> |
9bc7b387 | 41 | |
660685d9 AB |
42 | #include "mtdcore.h" |
43 | ||
5aa82940 | 44 | static DEFINE_MUTEX(mtd_mutex); |
1da177e4 | 45 | |
045e9a5d | 46 | /* |
f1a28c02 | 47 | * Data structure to hold the pointer to the mtd device as well |
92394b5c | 48 | * as mode information of various use cases. |
045e9a5d | 49 | */ |
f1a28c02 TG |
50 | struct mtd_file_info { |
51 | struct mtd_info *mtd; | |
cd874237 | 52 | struct inode *ino; |
f1a28c02 TG |
53 | enum mtd_file_modes mode; |
54 | }; | |
31f4233b | 55 | |
969e57ad | 56 | static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 | 57 | { |
f1a28c02 | 58 | struct mtd_file_info *mfi = file->private_data; |
b959957f | 59 | return fixed_size_llseek(file, offset, orig, mfi->mtd->size); |
1da177e4 LT |
60 | } |
61 | ||
00292bbf AV |
62 | static int count; |
63 | static struct vfsmount *mnt; | |
64 | static struct file_system_type mtd_inodefs_type; | |
1da177e4 | 65 | |
969e57ad | 66 | static int mtdchar_open(struct inode *inode, struct file *file) |
1da177e4 LT |
67 | { |
68 | int minor = iminor(inode); | |
69 | int devnum = minor >> 1; | |
6071239e | 70 | int ret = 0; |
1da177e4 | 71 | struct mtd_info *mtd; |
f1a28c02 | 72 | struct mtd_file_info *mfi; |
cd874237 | 73 | struct inode *mtd_ino; |
1da177e4 | 74 | |
289c0522 | 75 | pr_debug("MTD_open\n"); |
1da177e4 | 76 | |
1da177e4 | 77 | /* You can't open the RO devices RW */ |
aeb5d727 | 78 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
1da177e4 LT |
79 | return -EACCES; |
80 | ||
00292bbf AV |
81 | ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count); |
82 | if (ret) | |
83 | return ret; | |
84 | ||
5aa82940 | 85 | mutex_lock(&mtd_mutex); |
1da177e4 | 86 | mtd = get_mtd_device(NULL, devnum); |
97894cda | 87 | |
6071239e JC |
88 | if (IS_ERR(mtd)) { |
89 | ret = PTR_ERR(mtd); | |
90 | goto out; | |
91 | } | |
97894cda | 92 | |
402d3265 | 93 | if (mtd->type == MTD_ABSENT) { |
6071239e | 94 | ret = -ENODEV; |
c65390f4 | 95 | goto out1; |
1da177e4 LT |
96 | } |
97 | ||
00292bbf | 98 | mtd_ino = iget_locked(mnt->mnt_sb, devnum); |
cd874237 | 99 | if (!mtd_ino) { |
cd874237 | 100 | ret = -ENOMEM; |
c65390f4 | 101 | goto out1; |
cd874237 KS |
102 | } |
103 | if (mtd_ino->i_state & I_NEW) { | |
104 | mtd_ino->i_private = mtd; | |
105 | mtd_ino->i_mode = S_IFCHR; | |
106 | mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; | |
107 | unlock_new_inode(mtd_ino); | |
108 | } | |
109 | file->f_mapping = mtd_ino->i_mapping; | |
402d3265 | 110 | |
1da177e4 | 111 | /* You can't open it RW if it's not a writeable device */ |
aeb5d727 | 112 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
6071239e | 113 | ret = -EACCES; |
c65390f4 | 114 | goto out2; |
1da177e4 | 115 | } |
97894cda | 116 | |
f1a28c02 TG |
117 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
118 | if (!mfi) { | |
6071239e | 119 | ret = -ENOMEM; |
c65390f4 | 120 | goto out2; |
f1a28c02 | 121 | } |
cd874237 | 122 | mfi->ino = mtd_ino; |
f1a28c02 TG |
123 | mfi->mtd = mtd; |
124 | file->private_data = mfi; | |
c65390f4 AV |
125 | mutex_unlock(&mtd_mutex); |
126 | return 0; | |
f1a28c02 | 127 | |
c65390f4 AV |
128 | out2: |
129 | iput(mtd_ino); | |
130 | out1: | |
131 | put_mtd_device(mtd); | |
6071239e | 132 | out: |
5aa82940 | 133 | mutex_unlock(&mtd_mutex); |
00292bbf | 134 | simple_release_fs(&mnt, &count); |
6071239e | 135 | return ret; |
969e57ad | 136 | } /* mtdchar_open */ |
1da177e4 LT |
137 | |
138 | /*====================================================================*/ | |
139 | ||
969e57ad | 140 | static int mtdchar_close(struct inode *inode, struct file *file) |
1da177e4 | 141 | { |
f1a28c02 TG |
142 | struct mtd_file_info *mfi = file->private_data; |
143 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 | 144 | |
289c0522 | 145 | pr_debug("MTD_close\n"); |
1da177e4 | 146 | |
7eafaed5 | 147 | /* Only sync if opened RW */ |
327cf292 | 148 | if ((file->f_mode & FMODE_WRITE)) |
85f2f2a8 | 149 | mtd_sync(mtd); |
97894cda | 150 | |
cd874237 KS |
151 | iput(mfi->ino); |
152 | ||
1da177e4 | 153 | put_mtd_device(mtd); |
f1a28c02 TG |
154 | file->private_data = NULL; |
155 | kfree(mfi); | |
00292bbf | 156 | simple_release_fs(&mnt, &count); |
1da177e4 LT |
157 | |
158 | return 0; | |
969e57ad | 159 | } /* mtdchar_close */ |
1da177e4 | 160 | |
3e45cf5e GE |
161 | /* Back in June 2001, dwmw2 wrote: |
162 | * | |
163 | * FIXME: This _really_ needs to die. In 2.5, we should lock the | |
164 | * userspace buffer down and use it directly with readv/writev. | |
165 | * | |
166 | * The implementation below, using mtd_kmalloc_up_to, mitigates | |
167 | * allocation failures when the system is under low-memory situations | |
168 | * or if memory is highly fragmented at the cost of reducing the | |
169 | * performance of the requested transfer due to a smaller buffer size. | |
170 | * | |
171 | * A more complex but more memory-efficient implementation based on | |
172 | * get_user_pages and iovecs to cover extents of those pages is a | |
173 | * longer-term goal, as intimated by dwmw2 above. However, for the | |
174 | * write case, this requires yet more complex head and tail transfer | |
175 | * handling when those head and tail offsets and sizes are such that | |
176 | * alignment requirements are not met in the NAND subdriver. | |
177 | */ | |
1da177e4 | 178 | |
969e57ad AB |
179 | static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
180 | loff_t *ppos) | |
1da177e4 | 181 | { |
f1a28c02 TG |
182 | struct mtd_file_info *mfi = file->private_data; |
183 | struct mtd_info *mtd = mfi->mtd; | |
30fa9848 | 184 | size_t retlen; |
1da177e4 LT |
185 | size_t total_retlen=0; |
186 | int ret=0; | |
187 | int len; | |
3e45cf5e | 188 | size_t size = count; |
1da177e4 | 189 | char *kbuf; |
97894cda | 190 | |
289c0522 | 191 | pr_debug("MTD_read\n"); |
1da177e4 LT |
192 | |
193 | if (*ppos + count > mtd->size) | |
194 | count = mtd->size - *ppos; | |
195 | ||
196 | if (!count) | |
197 | return 0; | |
97894cda | 198 | |
3e45cf5e | 199 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
200 | if (!kbuf) |
201 | return -ENOMEM; | |
202 | ||
1da177e4 | 203 | while (count) { |
3e45cf5e | 204 | len = min_t(size_t, count, size); |
1da177e4 | 205 | |
f1a28c02 | 206 | switch (mfi->mode) { |
beb133fc | 207 | case MTD_FILE_MODE_OTP_FACTORY: |
d264f72a AB |
208 | ret = mtd_read_fact_prot_reg(mtd, *ppos, len, |
209 | &retlen, kbuf); | |
31f4233b | 210 | break; |
beb133fc | 211 | case MTD_FILE_MODE_OTP_USER: |
4ea1cabb AB |
212 | ret = mtd_read_user_prot_reg(mtd, *ppos, len, |
213 | &retlen, kbuf); | |
31f4233b | 214 | break; |
beb133fc | 215 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
216 | { |
217 | struct mtd_oob_ops ops; | |
218 | ||
0612b9dd | 219 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
220 | ops.datbuf = kbuf; |
221 | ops.oobbuf = NULL; | |
222 | ops.len = len; | |
223 | ||
fd2819bb | 224 | ret = mtd_read_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
225 | retlen = ops.retlen; |
226 | break; | |
227 | } | |
31f4233b | 228 | default: |
329ad399 | 229 | ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 230 | } |
7854d3f7 | 231 | /* Nand returns -EBADMSG on ECC errors, but it returns |
1da177e4 | 232 | * the data. For our userspace tools it is important |
7854d3f7 | 233 | * to dump areas with ECC errors! |
9a1fcdfd | 234 | * For kernel internal usage it also might return -EUCLEAN |
25985edc | 235 | * to signal the caller that a bitflip has occurred and has |
9a1fcdfd | 236 | * been corrected by the ECC algorithm. |
1da177e4 LT |
237 | * Userspace software which accesses NAND this way |
238 | * must be aware of the fact that it deals with NAND | |
239 | */ | |
d57f4054 | 240 | if (!ret || mtd_is_bitflip_or_eccerr(ret)) { |
1da177e4 LT |
241 | *ppos += retlen; |
242 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 243 | kfree(kbuf); |
1da177e4 LT |
244 | return -EFAULT; |
245 | } | |
246 | else | |
247 | total_retlen += retlen; | |
248 | ||
249 | count -= retlen; | |
250 | buf += retlen; | |
31f4233b NP |
251 | if (retlen == 0) |
252 | count = 0; | |
1da177e4 LT |
253 | } |
254 | else { | |
255 | kfree(kbuf); | |
256 | return ret; | |
257 | } | |
97894cda | 258 | |
1da177e4 LT |
259 | } |
260 | ||
b802c074 | 261 | kfree(kbuf); |
1da177e4 | 262 | return total_retlen; |
969e57ad | 263 | } /* mtdchar_read */ |
1da177e4 | 264 | |
969e57ad AB |
265 | static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
266 | loff_t *ppos) | |
1da177e4 | 267 | { |
f1a28c02 TG |
268 | struct mtd_file_info *mfi = file->private_data; |
269 | struct mtd_info *mtd = mfi->mtd; | |
3e45cf5e | 270 | size_t size = count; |
1da177e4 LT |
271 | char *kbuf; |
272 | size_t retlen; | |
273 | size_t total_retlen=0; | |
274 | int ret=0; | |
275 | int len; | |
276 | ||
289c0522 | 277 | pr_debug("MTD_write\n"); |
97894cda | 278 | |
1da177e4 LT |
279 | if (*ppos == mtd->size) |
280 | return -ENOSPC; | |
97894cda | 281 | |
1da177e4 LT |
282 | if (*ppos + count > mtd->size) |
283 | count = mtd->size - *ppos; | |
284 | ||
285 | if (!count) | |
286 | return 0; | |
287 | ||
3e45cf5e | 288 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
289 | if (!kbuf) |
290 | return -ENOMEM; | |
291 | ||
1da177e4 | 292 | while (count) { |
3e45cf5e | 293 | len = min_t(size_t, count, size); |
1da177e4 | 294 | |
1da177e4 LT |
295 | if (copy_from_user(kbuf, buf, len)) { |
296 | kfree(kbuf); | |
297 | return -EFAULT; | |
298 | } | |
97894cda | 299 | |
f1a28c02 | 300 | switch (mfi->mode) { |
beb133fc | 301 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
302 | ret = -EROFS; |
303 | break; | |
beb133fc | 304 | case MTD_FILE_MODE_OTP_USER: |
482b43ad AB |
305 | ret = mtd_write_user_prot_reg(mtd, *ppos, len, |
306 | &retlen, kbuf); | |
31f4233b | 307 | break; |
f1a28c02 | 308 | |
beb133fc | 309 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
310 | { |
311 | struct mtd_oob_ops ops; | |
312 | ||
0612b9dd | 313 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
314 | ops.datbuf = kbuf; |
315 | ops.oobbuf = NULL; | |
bf514081 | 316 | ops.ooboffs = 0; |
f1a28c02 TG |
317 | ops.len = len; |
318 | ||
a2cc5ba0 | 319 | ret = mtd_write_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
320 | retlen = ops.retlen; |
321 | break; | |
322 | } | |
323 | ||
31f4233b | 324 | default: |
eda95cbf | 325 | ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 326 | } |
1da177e4 LT |
327 | if (!ret) { |
328 | *ppos += retlen; | |
329 | total_retlen += retlen; | |
330 | count -= retlen; | |
331 | buf += retlen; | |
332 | } | |
333 | else { | |
334 | kfree(kbuf); | |
335 | return ret; | |
336 | } | |
1da177e4 LT |
337 | } |
338 | ||
b802c074 | 339 | kfree(kbuf); |
1da177e4 | 340 | return total_retlen; |
969e57ad | 341 | } /* mtdchar_write */ |
1da177e4 LT |
342 | |
343 | /*====================================================================== | |
344 | ||
345 | IOCTL calls for getting device parameters. | |
346 | ||
347 | ======================================================================*/ | |
348 | static void mtdchar_erase_callback (struct erase_info *instr) | |
349 | { | |
350 | wake_up((wait_queue_head_t *)instr->priv); | |
351 | } | |
352 | ||
f1a28c02 TG |
353 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
354 | { | |
355 | struct mtd_info *mtd = mfi->mtd; | |
b6de3d6c | 356 | size_t retlen; |
b6de3d6c | 357 | |
f1a28c02 TG |
358 | switch (mode) { |
359 | case MTD_OTP_FACTORY: | |
5dc63fa2 UKK |
360 | if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == |
361 | -EOPNOTSUPP) | |
362 | return -EOPNOTSUPP; | |
363 | ||
b6de3d6c | 364 | mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
f1a28c02 TG |
365 | break; |
366 | case MTD_OTP_USER: | |
5dc63fa2 UKK |
367 | if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == |
368 | -EOPNOTSUPP) | |
369 | return -EOPNOTSUPP; | |
370 | ||
b6de3d6c | 371 | mfi->mode = MTD_FILE_MODE_OTP_USER; |
f1a28c02 | 372 | break; |
f1a28c02 | 373 | case MTD_OTP_OFF: |
5dc63fa2 | 374 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 | 375 | break; |
5dc63fa2 UKK |
376 | default: |
377 | return -EINVAL; | |
f1a28c02 | 378 | } |
5dc63fa2 UKK |
379 | |
380 | return 0; | |
f1a28c02 | 381 | } |
f1a28c02 | 382 | |
969e57ad | 383 | static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, |
97718540 KC |
384 | uint64_t start, uint32_t length, void __user *ptr, |
385 | uint32_t __user *retp) | |
386 | { | |
9ce244b3 | 387 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
388 | struct mtd_oob_ops ops; |
389 | uint32_t retlen; | |
390 | int ret = 0; | |
391 | ||
392 | if (!(file->f_mode & FMODE_WRITE)) | |
393 | return -EPERM; | |
394 | ||
395 | if (length > 4096) | |
396 | return -EINVAL; | |
397 | ||
3c3c10bb | 398 | if (!mtd->_write_oob) |
97718540 KC |
399 | ret = -EOPNOTSUPP; |
400 | else | |
0040476b | 401 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; |
97718540 KC |
402 | |
403 | if (ret) | |
404 | return ret; | |
405 | ||
406 | ops.ooblen = length; | |
305b93f1 | 407 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 408 | ops.datbuf = NULL; |
beb133fc | 409 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 410 | MTD_OPS_PLACE_OOB; |
97718540 KC |
411 | |
412 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
413 | return -EINVAL; | |
414 | ||
df1f1d1c JL |
415 | ops.oobbuf = memdup_user(ptr, length); |
416 | if (IS_ERR(ops.oobbuf)) | |
417 | return PTR_ERR(ops.oobbuf); | |
97718540 | 418 | |
305b93f1 | 419 | start &= ~((uint64_t)mtd->writesize - 1); |
a2cc5ba0 | 420 | ret = mtd_write_oob(mtd, start, &ops); |
97718540 KC |
421 | |
422 | if (ops.oobretlen > 0xFFFFFFFFU) | |
423 | ret = -EOVERFLOW; | |
424 | retlen = ops.oobretlen; | |
425 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
426 | ret = -EFAULT; | |
427 | ||
428 | kfree(ops.oobbuf); | |
429 | return ret; | |
430 | } | |
431 | ||
969e57ad | 432 | static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
c46f6483 BN |
433 | uint64_t start, uint32_t length, void __user *ptr, |
434 | uint32_t __user *retp) | |
97718540 | 435 | { |
c46f6483 | 436 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
437 | struct mtd_oob_ops ops; |
438 | int ret = 0; | |
439 | ||
440 | if (length > 4096) | |
441 | return -EINVAL; | |
442 | ||
dac2639f AB |
443 | if (!access_ok(VERIFY_WRITE, ptr, length)) |
444 | return -EFAULT; | |
97718540 KC |
445 | |
446 | ops.ooblen = length; | |
305b93f1 | 447 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 448 | ops.datbuf = NULL; |
beb133fc | 449 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 450 | MTD_OPS_PLACE_OOB; |
97718540 KC |
451 | |
452 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
453 | return -EINVAL; | |
454 | ||
455 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
456 | if (!ops.oobbuf) | |
457 | return -ENOMEM; | |
458 | ||
305b93f1 | 459 | start &= ~((uint64_t)mtd->writesize - 1); |
fd2819bb | 460 | ret = mtd_read_oob(mtd, start, &ops); |
97718540 KC |
461 | |
462 | if (put_user(ops.oobretlen, retp)) | |
463 | ret = -EFAULT; | |
464 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
465 | ops.oobretlen)) | |
466 | ret = -EFAULT; | |
467 | ||
468 | kfree(ops.oobbuf); | |
041e4575 BN |
469 | |
470 | /* | |
471 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
472 | * data. For our userspace tools it is important to dump areas | |
473 | * with ECC errors! | |
474 | * For kernel internal usage it also might return -EUCLEAN | |
475 | * to signal the caller that a bitflip has occured and has | |
476 | * been corrected by the ECC algorithm. | |
477 | * | |
c478d7e4 BN |
478 | * Note: currently the standard NAND function, nand_read_oob_std, |
479 | * does not calculate ECC for the OOB area, so do not rely on | |
480 | * this behavior unless you have replaced it with your own. | |
041e4575 | 481 | */ |
d57f4054 | 482 | if (mtd_is_bitflip_or_eccerr(ret)) |
041e4575 BN |
483 | return 0; |
484 | ||
97718540 KC |
485 | return ret; |
486 | } | |
487 | ||
cc26c3cd BN |
488 | /* |
489 | * Copies (and truncates, if necessary) data from the larger struct, | |
490 | * nand_ecclayout, to the smaller, deprecated layout struct, | |
92394b5c | 491 | * nand_ecclayout_user. This is necessary only to support the deprecated |
cc26c3cd BN |
492 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use |
493 | * nand_ecclayout flexibly (i.e. the struct may change size in new | |
494 | * releases without requiring major rewrites). | |
495 | */ | |
496 | static int shrink_ecclayout(const struct nand_ecclayout *from, | |
497 | struct nand_ecclayout_user *to) | |
498 | { | |
499 | int i; | |
500 | ||
501 | if (!from || !to) | |
502 | return -EINVAL; | |
503 | ||
504 | memset(to, 0, sizeof(*to)); | |
505 | ||
0ceacf36 | 506 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
cc26c3cd BN |
507 | for (i = 0; i < to->eccbytes; i++) |
508 | to->eccpos[i] = from->eccpos[i]; | |
509 | ||
510 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
511 | if (from->oobfree[i].length == 0 && | |
512 | from->oobfree[i].offset == 0) | |
513 | break; | |
514 | to->oobavail += from->oobfree[i].length; | |
515 | to->oobfree[i] = from->oobfree[i]; | |
516 | } | |
517 | ||
518 | return 0; | |
519 | } | |
520 | ||
969e57ad | 521 | static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
d0f7959e RT |
522 | struct blkpg_ioctl_arg __user *arg) |
523 | { | |
524 | struct blkpg_ioctl_arg a; | |
525 | struct blkpg_partition p; | |
526 | ||
527 | if (!capable(CAP_SYS_ADMIN)) | |
528 | return -EPERM; | |
529 | ||
d0f7959e RT |
530 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
531 | return -EFAULT; | |
532 | ||
533 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
534 | return -EFAULT; | |
535 | ||
536 | switch (a.op) { | |
537 | case BLKPG_ADD_PARTITION: | |
538 | ||
a7e93dcd RT |
539 | /* Only master mtd device must be used to add partitions */ |
540 | if (mtd_is_partition(mtd)) | |
541 | return -EINVAL; | |
542 | ||
d0f7959e RT |
543 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
544 | ||
545 | case BLKPG_DEL_PARTITION: | |
546 | ||
547 | if (p.pno < 0) | |
548 | return -EINVAL; | |
549 | ||
550 | return mtd_del_partition(mtd, p.pno); | |
551 | ||
552 | default: | |
553 | return -EINVAL; | |
554 | } | |
555 | } | |
d0f7959e | 556 | |
969e57ad | 557 | static int mtdchar_write_ioctl(struct mtd_info *mtd, |
e99d8b08 BN |
558 | struct mtd_write_req __user *argp) |
559 | { | |
560 | struct mtd_write_req req; | |
561 | struct mtd_oob_ops ops; | |
562 | void __user *usr_data, *usr_oob; | |
563 | int ret; | |
564 | ||
565 | if (copy_from_user(&req, argp, sizeof(req)) || | |
566 | !access_ok(VERIFY_READ, req.usr_data, req.len) || | |
567 | !access_ok(VERIFY_READ, req.usr_oob, req.ooblen)) | |
568 | return -EFAULT; | |
3c3c10bb | 569 | if (!mtd->_write_oob) |
e99d8b08 BN |
570 | return -EOPNOTSUPP; |
571 | ||
572 | ops.mode = req.mode; | |
573 | ops.len = (size_t)req.len; | |
574 | ops.ooblen = (size_t)req.ooblen; | |
575 | ops.ooboffs = 0; | |
576 | ||
577 | usr_data = (void __user *)(uintptr_t)req.usr_data; | |
578 | usr_oob = (void __user *)(uintptr_t)req.usr_oob; | |
579 | ||
580 | if (req.usr_data) { | |
581 | ops.datbuf = memdup_user(usr_data, ops.len); | |
582 | if (IS_ERR(ops.datbuf)) | |
583 | return PTR_ERR(ops.datbuf); | |
584 | } else { | |
585 | ops.datbuf = NULL; | |
586 | } | |
587 | ||
588 | if (req.usr_oob) { | |
589 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); | |
590 | if (IS_ERR(ops.oobbuf)) { | |
591 | kfree(ops.datbuf); | |
592 | return PTR_ERR(ops.oobbuf); | |
593 | } | |
594 | } else { | |
595 | ops.oobbuf = NULL; | |
596 | } | |
597 | ||
a2cc5ba0 | 598 | ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
e99d8b08 BN |
599 | |
600 | kfree(ops.datbuf); | |
601 | kfree(ops.oobbuf); | |
602 | ||
603 | return ret; | |
604 | } | |
605 | ||
969e57ad | 606 | static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 607 | { |
f1a28c02 TG |
608 | struct mtd_file_info *mfi = file->private_data; |
609 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
610 | void __user *argp = (void __user *)arg; |
611 | int ret = 0; | |
612 | u_long size; | |
73c619ea | 613 | struct mtd_info_user info; |
97894cda | 614 | |
289c0522 | 615 | pr_debug("MTD_ioctl\n"); |
1da177e4 LT |
616 | |
617 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
618 | if (cmd & IOC_IN) { | |
619 | if (!access_ok(VERIFY_READ, argp, size)) | |
620 | return -EFAULT; | |
621 | } | |
622 | if (cmd & IOC_OUT) { | |
623 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
624 | return -EFAULT; | |
625 | } | |
97894cda | 626 | |
1da177e4 LT |
627 | switch (cmd) { |
628 | case MEMGETREGIONCOUNT: | |
629 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
630 | return -EFAULT; | |
631 | break; | |
632 | ||
633 | case MEMGETREGIONINFO: | |
634 | { | |
b67c5f87 ZW |
635 | uint32_t ur_idx; |
636 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 637 | struct region_info_user __user *ur = argp; |
1da177e4 | 638 | |
b67c5f87 | 639 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
640 | return -EFAULT; |
641 | ||
5e59be1f DC |
642 | if (ur_idx >= mtd->numeraseregions) |
643 | return -EINVAL; | |
644 | ||
b67c5f87 ZW |
645 | kr = &(mtd->eraseregions[ur_idx]); |
646 | ||
647 | if (put_user(kr->offset, &(ur->offset)) | |
648 | || put_user(kr->erasesize, &(ur->erasesize)) | |
649 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 650 | return -EFAULT; |
b67c5f87 | 651 | |
1da177e4 LT |
652 | break; |
653 | } | |
654 | ||
655 | case MEMGETINFO: | |
a0c5a394 | 656 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
657 | info.type = mtd->type; |
658 | info.flags = mtd->flags; | |
659 | info.size = mtd->size; | |
660 | info.erasesize = mtd->erasesize; | |
661 | info.writesize = mtd->writesize; | |
662 | info.oobsize = mtd->oobsize; | |
19fb4341 BN |
663 | /* The below field is obsolete */ |
664 | info.padding = 0; | |
73c619ea | 665 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
666 | return -EFAULT; |
667 | break; | |
668 | ||
669 | case MEMERASE: | |
0dc54e9f | 670 | case MEMERASE64: |
1da177e4 LT |
671 | { |
672 | struct erase_info *erase; | |
673 | ||
aeb5d727 | 674 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
675 | return -EPERM; |
676 | ||
95b93a0c | 677 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
678 | if (!erase) |
679 | ret = -ENOMEM; | |
680 | else { | |
681 | wait_queue_head_t waitq; | |
682 | DECLARE_WAITQUEUE(wait, current); | |
683 | ||
684 | init_waitqueue_head(&waitq); | |
685 | ||
0dc54e9f KC |
686 | if (cmd == MEMERASE64) { |
687 | struct erase_info_user64 einfo64; | |
688 | ||
689 | if (copy_from_user(&einfo64, argp, | |
690 | sizeof(struct erase_info_user64))) { | |
691 | kfree(erase); | |
692 | return -EFAULT; | |
693 | } | |
694 | erase->addr = einfo64.start; | |
695 | erase->len = einfo64.length; | |
696 | } else { | |
697 | struct erase_info_user einfo32; | |
698 | ||
699 | if (copy_from_user(&einfo32, argp, | |
700 | sizeof(struct erase_info_user))) { | |
701 | kfree(erase); | |
702 | return -EFAULT; | |
703 | } | |
704 | erase->addr = einfo32.start; | |
705 | erase->len = einfo32.length; | |
1da177e4 LT |
706 | } |
707 | erase->mtd = mtd; | |
708 | erase->callback = mtdchar_erase_callback; | |
709 | erase->priv = (unsigned long)&waitq; | |
97894cda | 710 | |
1da177e4 LT |
711 | /* |
712 | FIXME: Allow INTERRUPTIBLE. Which means | |
713 | not having the wait_queue head on the stack. | |
97894cda | 714 | |
1da177e4 LT |
715 | If the wq_head is on the stack, and we |
716 | leave because we got interrupted, then the | |
717 | wq_head is no longer there when the | |
718 | callback routine tries to wake us up. | |
719 | */ | |
7e1f0dc0 | 720 | ret = mtd_erase(mtd, erase); |
1da177e4 LT |
721 | if (!ret) { |
722 | set_current_state(TASK_UNINTERRUPTIBLE); | |
723 | add_wait_queue(&waitq, &wait); | |
724 | if (erase->state != MTD_ERASE_DONE && | |
725 | erase->state != MTD_ERASE_FAILED) | |
726 | schedule(); | |
727 | remove_wait_queue(&waitq, &wait); | |
728 | set_current_state(TASK_RUNNING); | |
729 | ||
730 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
731 | } | |
732 | kfree(erase); | |
733 | } | |
734 | break; | |
735 | } | |
736 | ||
737 | case MEMWRITEOOB: | |
738 | { | |
739 | struct mtd_oob_buf buf; | |
97718540 | 740 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 741 | |
97718540 KC |
742 | /* NOTE: writes return length to buf_user->length */ |
743 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 744 | ret = -EFAULT; |
97718540 | 745 | else |
969e57ad | 746 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
97718540 | 747 | buf.ptr, &buf_user->length); |
1da177e4 | 748 | break; |
1da177e4 LT |
749 | } |
750 | ||
751 | case MEMREADOOB: | |
752 | { | |
753 | struct mtd_oob_buf buf; | |
97718540 | 754 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 755 | |
97718540 KC |
756 | /* NOTE: writes return length to buf_user->start */ |
757 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 758 | ret = -EFAULT; |
97718540 | 759 | else |
969e57ad | 760 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
97718540 | 761 | buf.ptr, &buf_user->start); |
1da177e4 LT |
762 | break; |
763 | } | |
764 | ||
aea7cea9 KC |
765 | case MEMWRITEOOB64: |
766 | { | |
767 | struct mtd_oob_buf64 buf; | |
768 | struct mtd_oob_buf64 __user *buf_user = argp; | |
769 | ||
770 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
771 | ret = -EFAULT; | |
772 | else | |
969e57ad | 773 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
774 | (void __user *)(uintptr_t)buf.usr_ptr, |
775 | &buf_user->length); | |
776 | break; | |
777 | } | |
778 | ||
779 | case MEMREADOOB64: | |
780 | { | |
781 | struct mtd_oob_buf64 buf; | |
782 | struct mtd_oob_buf64 __user *buf_user = argp; | |
783 | ||
784 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
785 | ret = -EFAULT; | |
786 | else | |
969e57ad | 787 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
788 | (void __user *)(uintptr_t)buf.usr_ptr, |
789 | &buf_user->length); | |
790 | break; | |
791 | } | |
792 | ||
e99d8b08 BN |
793 | case MEMWRITE: |
794 | { | |
969e57ad | 795 | ret = mtdchar_write_ioctl(mtd, |
e99d8b08 BN |
796 | (struct mtd_write_req __user *)arg); |
797 | break; | |
798 | } | |
799 | ||
1da177e4 LT |
800 | case MEMLOCK: |
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_lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
808 | break; |
809 | } | |
810 | ||
811 | case MEMUNLOCK: | |
812 | { | |
175428b2 | 813 | struct erase_info_user einfo; |
1da177e4 | 814 | |
175428b2 | 815 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
816 | return -EFAULT; |
817 | ||
38134565 | 818 | ret = mtd_unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
819 | break; |
820 | } | |
821 | ||
9938424f RC |
822 | case MEMISLOCKED: |
823 | { | |
824 | struct erase_info_user einfo; | |
825 | ||
826 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
827 | return -EFAULT; | |
828 | ||
38134565 | 829 | ret = mtd_is_locked(mtd, einfo.start, einfo.length); |
9938424f RC |
830 | break; |
831 | } | |
832 | ||
5bd34c09 | 833 | /* Legacy interface */ |
1da177e4 LT |
834 | case MEMGETOOBSEL: |
835 | { | |
5bd34c09 TG |
836 | struct nand_oobinfo oi; |
837 | ||
838 | if (!mtd->ecclayout) | |
839 | return -EOPNOTSUPP; | |
840 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
841 | return -EINVAL; | |
842 | ||
843 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
844 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
845 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
846 | sizeof(oi.oobfree)); | |
d25ade71 | 847 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
848 | |
849 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
850 | return -EFAULT; |
851 | break; | |
852 | } | |
853 | ||
854 | case MEMGETBADBLOCK: | |
855 | { | |
856 | loff_t offs; | |
97894cda | 857 | |
1da177e4 LT |
858 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
859 | return -EFAULT; | |
8f461a73 | 860 | return mtd_block_isbad(mtd, offs); |
1da177e4 LT |
861 | break; |
862 | } | |
863 | ||
864 | case MEMSETBADBLOCK: | |
865 | { | |
866 | loff_t offs; | |
867 | ||
868 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
869 | return -EFAULT; | |
800ffd34 | 870 | return mtd_block_markbad(mtd, offs); |
1da177e4 LT |
871 | break; |
872 | } | |
873 | ||
31f4233b NP |
874 | case OTPSELECT: |
875 | { | |
876 | int mode; | |
877 | if (copy_from_user(&mode, argp, sizeof(int))) | |
878 | return -EFAULT; | |
f1a28c02 | 879 | |
beb133fc | 880 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 TG |
881 | |
882 | ret = otp_select_filemode(mfi, mode); | |
883 | ||
81dba488 | 884 | file->f_pos = 0; |
31f4233b NP |
885 | break; |
886 | } | |
887 | ||
888 | case OTPGETREGIONCOUNT: | |
889 | case OTPGETREGIONINFO: | |
890 | { | |
891 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
892 | if (!buf) | |
893 | return -ENOMEM; | |
f1a28c02 | 894 | switch (mfi->mode) { |
beb133fc | 895 | case MTD_FILE_MODE_OTP_FACTORY: |
87e858a9 | 896 | ret = mtd_get_fact_prot_info(mtd, buf, 4096); |
31f4233b | 897 | break; |
beb133fc | 898 | case MTD_FILE_MODE_OTP_USER: |
87e858a9 | 899 | ret = mtd_get_user_prot_info(mtd, buf, 4096); |
31f4233b | 900 | break; |
f1a28c02 | 901 | default: |
87e858a9 | 902 | ret = -EINVAL; |
f1a28c02 | 903 | break; |
31f4233b NP |
904 | } |
905 | if (ret >= 0) { | |
906 | if (cmd == OTPGETREGIONCOUNT) { | |
907 | int nbr = ret / sizeof(struct otp_info); | |
908 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
909 | } else | |
910 | ret = copy_to_user(argp, buf, ret); | |
911 | if (ret) | |
912 | ret = -EFAULT; | |
913 | } | |
914 | kfree(buf); | |
915 | break; | |
916 | } | |
917 | ||
918 | case OTPLOCK: | |
919 | { | |
175428b2 | 920 | struct otp_info oinfo; |
31f4233b | 921 | |
beb133fc | 922 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
31f4233b | 923 | return -EINVAL; |
175428b2 | 924 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b | 925 | return -EFAULT; |
4403dbfb | 926 | ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
927 | break; |
928 | } | |
31f4233b | 929 | |
7854d3f7 | 930 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
931 | case ECCGETLAYOUT: |
932 | { | |
cc26c3cd BN |
933 | struct nand_ecclayout_user *usrlay; |
934 | ||
f1a28c02 TG |
935 | if (!mtd->ecclayout) |
936 | return -EOPNOTSUPP; | |
937 | ||
cc26c3cd BN |
938 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
939 | if (!usrlay) | |
940 | return -ENOMEM; | |
941 | ||
942 | shrink_ecclayout(mtd->ecclayout, usrlay); | |
943 | ||
944 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
945 | ret = -EFAULT; | |
946 | kfree(usrlay); | |
f1a28c02 TG |
947 | break; |
948 | } | |
949 | ||
950 | case ECCGETSTATS: | |
951 | { | |
952 | if (copy_to_user(argp, &mtd->ecc_stats, | |
953 | sizeof(struct mtd_ecc_stats))) | |
954 | return -EFAULT; | |
955 | break; | |
956 | } | |
957 | ||
958 | case MTDFILEMODE: | |
959 | { | |
960 | mfi->mode = 0; | |
961 | ||
962 | switch(arg) { | |
beb133fc BN |
963 | case MTD_FILE_MODE_OTP_FACTORY: |
964 | case MTD_FILE_MODE_OTP_USER: | |
f1a28c02 TG |
965 | ret = otp_select_filemode(mfi, arg); |
966 | break; | |
967 | ||
beb133fc | 968 | case MTD_FILE_MODE_RAW: |
fc002e3c | 969 | if (!mtd_has_oob(mtd)) |
f1a28c02 TG |
970 | return -EOPNOTSUPP; |
971 | mfi->mode = arg; | |
972 | ||
beb133fc | 973 | case MTD_FILE_MODE_NORMAL: |
f1a28c02 TG |
974 | break; |
975 | default: | |
976 | ret = -EINVAL; | |
977 | } | |
978 | file->f_pos = 0; | |
979 | break; | |
980 | } | |
981 | ||
d0f7959e RT |
982 | case BLKPG: |
983 | { | |
969e57ad | 984 | ret = mtdchar_blkpg_ioctl(mtd, |
d0f7959e RT |
985 | (struct blkpg_ioctl_arg __user *)arg); |
986 | break; | |
987 | } | |
988 | ||
989 | case BLKRRPART: | |
990 | { | |
991 | /* No reread partition feature. Just return ok */ | |
992 | ret = 0; | |
993 | break; | |
994 | } | |
d0f7959e | 995 | |
1da177e4 LT |
996 | default: |
997 | ret = -ENOTTY; | |
998 | } | |
999 | ||
1000 | return ret; | |
1001 | } /* memory_ioctl */ | |
1002 | ||
969e57ad | 1003 | static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
55929332 AB |
1004 | { |
1005 | int ret; | |
1006 | ||
5aa82940 | 1007 | mutex_lock(&mtd_mutex); |
969e57ad | 1008 | ret = mtdchar_ioctl(file, cmd, arg); |
5aa82940 | 1009 | mutex_unlock(&mtd_mutex); |
55929332 AB |
1010 | |
1011 | return ret; | |
1012 | } | |
1013 | ||
97718540 KC |
1014 | #ifdef CONFIG_COMPAT |
1015 | ||
1016 | struct mtd_oob_buf32 { | |
1017 | u_int32_t start; | |
1018 | u_int32_t length; | |
1019 | compat_caddr_t ptr; /* unsigned char* */ | |
1020 | }; | |
1021 | ||
1022 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
1023 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
1024 | ||
969e57ad | 1025 | static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, |
97718540 KC |
1026 | unsigned long arg) |
1027 | { | |
1028 | struct mtd_file_info *mfi = file->private_data; | |
1029 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 1030 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1031 | int ret = 0; |
1032 | ||
5aa82940 | 1033 | mutex_lock(&mtd_mutex); |
97718540 KC |
1034 | |
1035 | switch (cmd) { | |
1036 | case MEMWRITEOOB32: | |
1037 | { | |
1038 | struct mtd_oob_buf32 buf; | |
1039 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1040 | ||
1041 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1042 | ret = -EFAULT; | |
1043 | else | |
969e57ad | 1044 | ret = mtdchar_writeoob(file, mtd, buf.start, |
97718540 KC |
1045 | buf.length, compat_ptr(buf.ptr), |
1046 | &buf_user->length); | |
1047 | break; | |
1048 | } | |
1049 | ||
1050 | case MEMREADOOB32: | |
1051 | { | |
1052 | struct mtd_oob_buf32 buf; | |
1053 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1054 | ||
1055 | /* NOTE: writes return length to buf->start */ | |
1056 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1057 | ret = -EFAULT; | |
1058 | else | |
969e57ad | 1059 | ret = mtdchar_readoob(file, mtd, buf.start, |
97718540 KC |
1060 | buf.length, compat_ptr(buf.ptr), |
1061 | &buf_user->start); | |
1062 | break; | |
1063 | } | |
1064 | default: | |
969e57ad | 1065 | ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1066 | } |
1067 | ||
5aa82940 | 1068 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1069 | |
1070 | return ret; | |
1071 | } | |
1072 | ||
1073 | #endif /* CONFIG_COMPAT */ | |
1074 | ||
402d3265 DH |
1075 | /* |
1076 | * try to determine where a shared mapping can be made | |
1077 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1078 | * mappings) | |
1079 | */ | |
1080 | #ifndef CONFIG_MMU | |
969e57ad | 1081 | static unsigned long mtdchar_get_unmapped_area(struct file *file, |
402d3265 DH |
1082 | unsigned long addr, |
1083 | unsigned long len, | |
1084 | unsigned long pgoff, | |
1085 | unsigned long flags) | |
1086 | { | |
1087 | struct mtd_file_info *mfi = file->private_data; | |
1088 | struct mtd_info *mtd = mfi->mtd; | |
cd621274 AB |
1089 | unsigned long offset; |
1090 | int ret; | |
402d3265 | 1091 | |
cd621274 AB |
1092 | if (addr != 0) |
1093 | return (unsigned long) -EINVAL; | |
402d3265 | 1094 | |
cd621274 AB |
1095 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) |
1096 | return (unsigned long) -EINVAL; | |
402d3265 | 1097 | |
cd621274 AB |
1098 | offset = pgoff << PAGE_SHIFT; |
1099 | if (offset > mtd->size - len) | |
1100 | return (unsigned long) -EINVAL; | |
402d3265 | 1101 | |
cd621274 | 1102 | ret = mtd_get_unmapped_area(mtd, len, offset, flags); |
b9995932 | 1103 | return ret == -EOPNOTSUPP ? -ENODEV : ret; |
402d3265 DH |
1104 | } |
1105 | #endif | |
1106 | ||
1107 | /* | |
1108 | * set up a mapping for shared memory segments | |
1109 | */ | |
969e57ad | 1110 | static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) |
402d3265 DH |
1111 | { |
1112 | #ifdef CONFIG_MMU | |
1113 | struct mtd_file_info *mfi = file->private_data; | |
1114 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d | 1115 | struct map_info *map = mtd->priv; |
dd02b67d | 1116 | |
f5cf8f07 DW |
1117 | /* This is broken because it assumes the MTD device is map-based |
1118 | and that mtd->priv is a valid struct map_info. It should be | |
1119 | replaced with something that uses the mtd_get_unmapped_area() | |
1120 | operation properly. */ | |
1121 | if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { | |
dd02b67d | 1122 | #ifdef pgprot_noncached |
8558e4a2 | 1123 | if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) |
dd02b67d AG |
1124 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1125 | #endif | |
8558e4a2 | 1126 | return vm_iomap_memory(vma, map->phys, map->size); |
dd02b67d | 1127 | } |
b9995932 | 1128 | return -ENODEV; |
402d3265 | 1129 | #else |
b9995932 | 1130 | return vma->vm_flags & VM_SHARED ? 0 : -EACCES; |
402d3265 DH |
1131 | #endif |
1132 | } | |
1133 | ||
d54b1fdb | 1134 | static const struct file_operations mtd_fops = { |
1da177e4 | 1135 | .owner = THIS_MODULE, |
969e57ad AB |
1136 | .llseek = mtdchar_lseek, |
1137 | .read = mtdchar_read, | |
1138 | .write = mtdchar_write, | |
1139 | .unlocked_ioctl = mtdchar_unlocked_ioctl, | |
97718540 | 1140 | #ifdef CONFIG_COMPAT |
969e57ad | 1141 | .compat_ioctl = mtdchar_compat_ioctl, |
97718540 | 1142 | #endif |
969e57ad AB |
1143 | .open = mtdchar_open, |
1144 | .release = mtdchar_close, | |
1145 | .mmap = mtdchar_mmap, | |
402d3265 | 1146 | #ifndef CONFIG_MMU |
969e57ad | 1147 | .get_unmapped_area = mtdchar_get_unmapped_area, |
402d3265 | 1148 | #endif |
1da177e4 LT |
1149 | }; |
1150 | ||
00292bbf AV |
1151 | static const struct super_operations mtd_ops = { |
1152 | .drop_inode = generic_delete_inode, | |
1153 | .statfs = simple_statfs, | |
1154 | }; | |
1155 | ||
51139ada AV |
1156 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
1157 | int flags, const char *dev_name, void *data) | |
cd874237 | 1158 | { |
00292bbf | 1159 | return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC); |
cd874237 KS |
1160 | } |
1161 | ||
1162 | static struct file_system_type mtd_inodefs_type = { | |
1163 | .name = "mtd_inodefs", | |
51139ada | 1164 | .mount = mtd_inodefs_mount, |
cd874237 KS |
1165 | .kill_sb = kill_anon_super, |
1166 | }; | |
7f78e035 | 1167 | MODULE_ALIAS_FS("mtd_inodefs"); |
cd874237 | 1168 | |
660685d9 | 1169 | int __init init_mtdchar(void) |
1da177e4 | 1170 | { |
cd874237 | 1171 | int ret; |
1f24b5a8 | 1172 | |
cd874237 | 1173 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1174 | "mtd", &mtd_fops); |
cd874237 | 1175 | if (ret < 0) { |
57ae2b60 AB |
1176 | pr_err("Can't allocate major number %d for MTD\n", |
1177 | MTD_CHAR_MAJOR); | |
cd874237 | 1178 | return ret; |
9bc7b387 TP |
1179 | } |
1180 | ||
cd874237 KS |
1181 | ret = register_filesystem(&mtd_inodefs_type); |
1182 | if (ret) { | |
57ae2b60 AB |
1183 | pr_err("Can't register mtd_inodefs filesystem, error %d\n", |
1184 | ret); | |
cd874237 KS |
1185 | goto err_unregister_chdev; |
1186 | } | |
57ae2b60 | 1187 | |
cd874237 KS |
1188 | return ret; |
1189 | ||
cd874237 KS |
1190 | err_unregister_chdev: |
1191 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); | |
1192 | return ret; | |
1da177e4 LT |
1193 | } |
1194 | ||
660685d9 | 1195 | void __exit cleanup_mtdchar(void) |
1da177e4 | 1196 | { |
cd874237 | 1197 | unregister_filesystem(&mtd_inodefs_type); |
dad0db31 | 1198 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1199 | } |
1200 | ||
90160e13 | 1201 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |