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> |
1da177e4 | 35 | #include <linux/mtd/mtd.h> |
d0f7959e | 36 | #include <linux/mtd/partitions.h> |
dd02b67d | 37 | #include <linux/mtd/map.h> |
1da177e4 | 38 | |
15fdc52f | 39 | #include <asm/uaccess.h> |
9bc7b387 | 40 | |
660685d9 AB |
41 | #include "mtdcore.h" |
42 | ||
5aa82940 | 43 | static DEFINE_MUTEX(mtd_mutex); |
1da177e4 | 44 | |
045e9a5d | 45 | /* |
f1a28c02 | 46 | * Data structure to hold the pointer to the mtd device as well |
92394b5c | 47 | * as mode information of various use cases. |
045e9a5d | 48 | */ |
f1a28c02 TG |
49 | struct mtd_file_info { |
50 | struct mtd_info *mtd; | |
cd874237 | 51 | struct inode *ino; |
f1a28c02 TG |
52 | enum mtd_file_modes mode; |
53 | }; | |
31f4233b | 54 | |
969e57ad | 55 | static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 | 56 | { |
f1a28c02 TG |
57 | struct mtd_file_info *mfi = file->private_data; |
58 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
59 | |
60 | switch (orig) { | |
ea59830d | 61 | case SEEK_SET: |
1da177e4 | 62 | break; |
ea59830d | 63 | case SEEK_CUR: |
8b491d75 | 64 | offset += file->f_pos; |
1da177e4 | 65 | break; |
ea59830d | 66 | case SEEK_END: |
8b491d75 | 67 | offset += mtd->size; |
1da177e4 LT |
68 | break; |
69 | default: | |
70 | return -EINVAL; | |
71 | } | |
72 | ||
1887f517 | 73 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 74 | return file->f_pos = offset; |
1da177e4 | 75 | |
8b491d75 | 76 | return -EINVAL; |
1da177e4 LT |
77 | } |
78 | ||
00292bbf AV |
79 | static int count; |
80 | static struct vfsmount *mnt; | |
81 | static struct file_system_type mtd_inodefs_type; | |
1da177e4 | 82 | |
969e57ad | 83 | static int mtdchar_open(struct inode *inode, struct file *file) |
1da177e4 LT |
84 | { |
85 | int minor = iminor(inode); | |
86 | int devnum = minor >> 1; | |
6071239e | 87 | int ret = 0; |
1da177e4 | 88 | struct mtd_info *mtd; |
f1a28c02 | 89 | struct mtd_file_info *mfi; |
cd874237 | 90 | struct inode *mtd_ino; |
1da177e4 | 91 | |
289c0522 | 92 | pr_debug("MTD_open\n"); |
1da177e4 | 93 | |
1da177e4 | 94 | /* You can't open the RO devices RW */ |
aeb5d727 | 95 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
1da177e4 LT |
96 | return -EACCES; |
97 | ||
00292bbf AV |
98 | ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count); |
99 | if (ret) | |
100 | return ret; | |
101 | ||
5aa82940 | 102 | mutex_lock(&mtd_mutex); |
1da177e4 | 103 | mtd = get_mtd_device(NULL, devnum); |
97894cda | 104 | |
6071239e JC |
105 | if (IS_ERR(mtd)) { |
106 | ret = PTR_ERR(mtd); | |
107 | goto out; | |
108 | } | |
97894cda | 109 | |
402d3265 | 110 | if (mtd->type == MTD_ABSENT) { |
6071239e | 111 | ret = -ENODEV; |
c65390f4 | 112 | goto out1; |
1da177e4 LT |
113 | } |
114 | ||
00292bbf | 115 | mtd_ino = iget_locked(mnt->mnt_sb, devnum); |
cd874237 | 116 | if (!mtd_ino) { |
cd874237 | 117 | ret = -ENOMEM; |
c65390f4 | 118 | goto out1; |
cd874237 KS |
119 | } |
120 | if (mtd_ino->i_state & I_NEW) { | |
121 | mtd_ino->i_private = mtd; | |
122 | mtd_ino->i_mode = S_IFCHR; | |
123 | mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; | |
124 | unlock_new_inode(mtd_ino); | |
125 | } | |
126 | file->f_mapping = mtd_ino->i_mapping; | |
402d3265 | 127 | |
1da177e4 | 128 | /* You can't open it RW if it's not a writeable device */ |
aeb5d727 | 129 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
6071239e | 130 | ret = -EACCES; |
c65390f4 | 131 | goto out2; |
1da177e4 | 132 | } |
97894cda | 133 | |
f1a28c02 TG |
134 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
135 | if (!mfi) { | |
6071239e | 136 | ret = -ENOMEM; |
c65390f4 | 137 | goto out2; |
f1a28c02 | 138 | } |
cd874237 | 139 | mfi->ino = mtd_ino; |
f1a28c02 TG |
140 | mfi->mtd = mtd; |
141 | file->private_data = mfi; | |
c65390f4 AV |
142 | mutex_unlock(&mtd_mutex); |
143 | return 0; | |
f1a28c02 | 144 | |
c65390f4 AV |
145 | out2: |
146 | iput(mtd_ino); | |
147 | out1: | |
148 | put_mtd_device(mtd); | |
6071239e | 149 | out: |
5aa82940 | 150 | mutex_unlock(&mtd_mutex); |
00292bbf | 151 | simple_release_fs(&mnt, &count); |
6071239e | 152 | return ret; |
969e57ad | 153 | } /* mtdchar_open */ |
1da177e4 LT |
154 | |
155 | /*====================================================================*/ | |
156 | ||
969e57ad | 157 | static int mtdchar_close(struct inode *inode, struct file *file) |
1da177e4 | 158 | { |
f1a28c02 TG |
159 | struct mtd_file_info *mfi = file->private_data; |
160 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 | 161 | |
289c0522 | 162 | pr_debug("MTD_close\n"); |
1da177e4 | 163 | |
7eafaed5 | 164 | /* Only sync if opened RW */ |
327cf292 | 165 | if ((file->f_mode & FMODE_WRITE)) |
85f2f2a8 | 166 | mtd_sync(mtd); |
97894cda | 167 | |
cd874237 KS |
168 | iput(mfi->ino); |
169 | ||
1da177e4 | 170 | put_mtd_device(mtd); |
f1a28c02 TG |
171 | file->private_data = NULL; |
172 | kfree(mfi); | |
00292bbf | 173 | simple_release_fs(&mnt, &count); |
1da177e4 LT |
174 | |
175 | return 0; | |
969e57ad | 176 | } /* mtdchar_close */ |
1da177e4 | 177 | |
3e45cf5e GE |
178 | /* Back in June 2001, dwmw2 wrote: |
179 | * | |
180 | * FIXME: This _really_ needs to die. In 2.5, we should lock the | |
181 | * userspace buffer down and use it directly with readv/writev. | |
182 | * | |
183 | * The implementation below, using mtd_kmalloc_up_to, mitigates | |
184 | * allocation failures when the system is under low-memory situations | |
185 | * or if memory is highly fragmented at the cost of reducing the | |
186 | * performance of the requested transfer due to a smaller buffer size. | |
187 | * | |
188 | * A more complex but more memory-efficient implementation based on | |
189 | * get_user_pages and iovecs to cover extents of those pages is a | |
190 | * longer-term goal, as intimated by dwmw2 above. However, for the | |
191 | * write case, this requires yet more complex head and tail transfer | |
192 | * handling when those head and tail offsets and sizes are such that | |
193 | * alignment requirements are not met in the NAND subdriver. | |
194 | */ | |
1da177e4 | 195 | |
969e57ad AB |
196 | static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
197 | loff_t *ppos) | |
1da177e4 | 198 | { |
f1a28c02 TG |
199 | struct mtd_file_info *mfi = file->private_data; |
200 | struct mtd_info *mtd = mfi->mtd; | |
30fa9848 | 201 | size_t retlen; |
1da177e4 LT |
202 | size_t total_retlen=0; |
203 | int ret=0; | |
204 | int len; | |
3e45cf5e | 205 | size_t size = count; |
1da177e4 | 206 | char *kbuf; |
97894cda | 207 | |
289c0522 | 208 | pr_debug("MTD_read\n"); |
1da177e4 LT |
209 | |
210 | if (*ppos + count > mtd->size) | |
211 | count = mtd->size - *ppos; | |
212 | ||
213 | if (!count) | |
214 | return 0; | |
97894cda | 215 | |
3e45cf5e | 216 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
217 | if (!kbuf) |
218 | return -ENOMEM; | |
219 | ||
1da177e4 | 220 | while (count) { |
3e45cf5e | 221 | len = min_t(size_t, count, size); |
1da177e4 | 222 | |
f1a28c02 | 223 | switch (mfi->mode) { |
beb133fc | 224 | case MTD_FILE_MODE_OTP_FACTORY: |
d264f72a AB |
225 | ret = mtd_read_fact_prot_reg(mtd, *ppos, len, |
226 | &retlen, kbuf); | |
31f4233b | 227 | break; |
beb133fc | 228 | case MTD_FILE_MODE_OTP_USER: |
4ea1cabb AB |
229 | ret = mtd_read_user_prot_reg(mtd, *ppos, len, |
230 | &retlen, kbuf); | |
31f4233b | 231 | break; |
beb133fc | 232 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
233 | { |
234 | struct mtd_oob_ops ops; | |
235 | ||
0612b9dd | 236 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
237 | ops.datbuf = kbuf; |
238 | ops.oobbuf = NULL; | |
239 | ops.len = len; | |
240 | ||
fd2819bb | 241 | ret = mtd_read_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
242 | retlen = ops.retlen; |
243 | break; | |
244 | } | |
31f4233b | 245 | default: |
329ad399 | 246 | ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 247 | } |
7854d3f7 | 248 | /* Nand returns -EBADMSG on ECC errors, but it returns |
1da177e4 | 249 | * the data. For our userspace tools it is important |
7854d3f7 | 250 | * to dump areas with ECC errors! |
9a1fcdfd | 251 | * For kernel internal usage it also might return -EUCLEAN |
25985edc | 252 | * to signal the caller that a bitflip has occurred and has |
9a1fcdfd | 253 | * been corrected by the ECC algorithm. |
1da177e4 LT |
254 | * Userspace software which accesses NAND this way |
255 | * must be aware of the fact that it deals with NAND | |
256 | */ | |
d57f4054 | 257 | if (!ret || mtd_is_bitflip_or_eccerr(ret)) { |
1da177e4 LT |
258 | *ppos += retlen; |
259 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 260 | kfree(kbuf); |
1da177e4 LT |
261 | return -EFAULT; |
262 | } | |
263 | else | |
264 | total_retlen += retlen; | |
265 | ||
266 | count -= retlen; | |
267 | buf += retlen; | |
31f4233b NP |
268 | if (retlen == 0) |
269 | count = 0; | |
1da177e4 LT |
270 | } |
271 | else { | |
272 | kfree(kbuf); | |
273 | return ret; | |
274 | } | |
97894cda | 275 | |
1da177e4 LT |
276 | } |
277 | ||
b802c074 | 278 | kfree(kbuf); |
1da177e4 | 279 | return total_retlen; |
969e57ad | 280 | } /* mtdchar_read */ |
1da177e4 | 281 | |
969e57ad AB |
282 | static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
283 | loff_t *ppos) | |
1da177e4 | 284 | { |
f1a28c02 TG |
285 | struct mtd_file_info *mfi = file->private_data; |
286 | struct mtd_info *mtd = mfi->mtd; | |
3e45cf5e | 287 | size_t size = count; |
1da177e4 LT |
288 | char *kbuf; |
289 | size_t retlen; | |
290 | size_t total_retlen=0; | |
291 | int ret=0; | |
292 | int len; | |
293 | ||
289c0522 | 294 | pr_debug("MTD_write\n"); |
97894cda | 295 | |
1da177e4 LT |
296 | if (*ppos == mtd->size) |
297 | return -ENOSPC; | |
97894cda | 298 | |
1da177e4 LT |
299 | if (*ppos + count > mtd->size) |
300 | count = mtd->size - *ppos; | |
301 | ||
302 | if (!count) | |
303 | return 0; | |
304 | ||
3e45cf5e | 305 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
306 | if (!kbuf) |
307 | return -ENOMEM; | |
308 | ||
1da177e4 | 309 | while (count) { |
3e45cf5e | 310 | len = min_t(size_t, count, size); |
1da177e4 | 311 | |
1da177e4 LT |
312 | if (copy_from_user(kbuf, buf, len)) { |
313 | kfree(kbuf); | |
314 | return -EFAULT; | |
315 | } | |
97894cda | 316 | |
f1a28c02 | 317 | switch (mfi->mode) { |
beb133fc | 318 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
319 | ret = -EROFS; |
320 | break; | |
beb133fc | 321 | case MTD_FILE_MODE_OTP_USER: |
482b43ad AB |
322 | ret = mtd_write_user_prot_reg(mtd, *ppos, len, |
323 | &retlen, kbuf); | |
31f4233b | 324 | break; |
f1a28c02 | 325 | |
beb133fc | 326 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
327 | { |
328 | struct mtd_oob_ops ops; | |
329 | ||
0612b9dd | 330 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
331 | ops.datbuf = kbuf; |
332 | ops.oobbuf = NULL; | |
bf514081 | 333 | ops.ooboffs = 0; |
f1a28c02 TG |
334 | ops.len = len; |
335 | ||
a2cc5ba0 | 336 | ret = mtd_write_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
337 | retlen = ops.retlen; |
338 | break; | |
339 | } | |
340 | ||
31f4233b | 341 | default: |
eda95cbf | 342 | ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 343 | } |
1da177e4 LT |
344 | if (!ret) { |
345 | *ppos += retlen; | |
346 | total_retlen += retlen; | |
347 | count -= retlen; | |
348 | buf += retlen; | |
349 | } | |
350 | else { | |
351 | kfree(kbuf); | |
352 | return ret; | |
353 | } | |
1da177e4 LT |
354 | } |
355 | ||
b802c074 | 356 | kfree(kbuf); |
1da177e4 | 357 | return total_retlen; |
969e57ad | 358 | } /* mtdchar_write */ |
1da177e4 LT |
359 | |
360 | /*====================================================================== | |
361 | ||
362 | IOCTL calls for getting device parameters. | |
363 | ||
364 | ======================================================================*/ | |
365 | static void mtdchar_erase_callback (struct erase_info *instr) | |
366 | { | |
367 | wake_up((wait_queue_head_t *)instr->priv); | |
368 | } | |
369 | ||
f1a28c02 TG |
370 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
371 | { | |
372 | struct mtd_info *mtd = mfi->mtd; | |
b6de3d6c | 373 | size_t retlen; |
b6de3d6c | 374 | |
f1a28c02 TG |
375 | switch (mode) { |
376 | case MTD_OTP_FACTORY: | |
5dc63fa2 UKK |
377 | if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == |
378 | -EOPNOTSUPP) | |
379 | return -EOPNOTSUPP; | |
380 | ||
b6de3d6c | 381 | mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
f1a28c02 TG |
382 | break; |
383 | case MTD_OTP_USER: | |
5dc63fa2 UKK |
384 | if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == |
385 | -EOPNOTSUPP) | |
386 | return -EOPNOTSUPP; | |
387 | ||
b6de3d6c | 388 | mfi->mode = MTD_FILE_MODE_OTP_USER; |
f1a28c02 | 389 | break; |
f1a28c02 | 390 | case MTD_OTP_OFF: |
5dc63fa2 | 391 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 | 392 | break; |
5dc63fa2 UKK |
393 | default: |
394 | return -EINVAL; | |
f1a28c02 | 395 | } |
5dc63fa2 UKK |
396 | |
397 | return 0; | |
f1a28c02 | 398 | } |
f1a28c02 | 399 | |
969e57ad | 400 | static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, |
97718540 KC |
401 | uint64_t start, uint32_t length, void __user *ptr, |
402 | uint32_t __user *retp) | |
403 | { | |
9ce244b3 | 404 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
405 | struct mtd_oob_ops ops; |
406 | uint32_t retlen; | |
407 | int ret = 0; | |
408 | ||
409 | if (!(file->f_mode & FMODE_WRITE)) | |
410 | return -EPERM; | |
411 | ||
412 | if (length > 4096) | |
413 | return -EINVAL; | |
414 | ||
3c3c10bb | 415 | if (!mtd->_write_oob) |
97718540 KC |
416 | ret = -EOPNOTSUPP; |
417 | else | |
0040476b | 418 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; |
97718540 KC |
419 | |
420 | if (ret) | |
421 | return ret; | |
422 | ||
423 | ops.ooblen = length; | |
305b93f1 | 424 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 425 | ops.datbuf = NULL; |
beb133fc | 426 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 427 | MTD_OPS_PLACE_OOB; |
97718540 KC |
428 | |
429 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
430 | return -EINVAL; | |
431 | ||
df1f1d1c JL |
432 | ops.oobbuf = memdup_user(ptr, length); |
433 | if (IS_ERR(ops.oobbuf)) | |
434 | return PTR_ERR(ops.oobbuf); | |
97718540 | 435 | |
305b93f1 | 436 | start &= ~((uint64_t)mtd->writesize - 1); |
a2cc5ba0 | 437 | ret = mtd_write_oob(mtd, start, &ops); |
97718540 KC |
438 | |
439 | if (ops.oobretlen > 0xFFFFFFFFU) | |
440 | ret = -EOVERFLOW; | |
441 | retlen = ops.oobretlen; | |
442 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
443 | ret = -EFAULT; | |
444 | ||
445 | kfree(ops.oobbuf); | |
446 | return ret; | |
447 | } | |
448 | ||
969e57ad | 449 | static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
c46f6483 BN |
450 | uint64_t start, uint32_t length, void __user *ptr, |
451 | uint32_t __user *retp) | |
97718540 | 452 | { |
c46f6483 | 453 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
454 | struct mtd_oob_ops ops; |
455 | int ret = 0; | |
456 | ||
457 | if (length > 4096) | |
458 | return -EINVAL; | |
459 | ||
dac2639f AB |
460 | if (!access_ok(VERIFY_WRITE, ptr, length)) |
461 | return -EFAULT; | |
97718540 KC |
462 | |
463 | ops.ooblen = length; | |
305b93f1 | 464 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 465 | ops.datbuf = NULL; |
beb133fc | 466 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 467 | MTD_OPS_PLACE_OOB; |
97718540 KC |
468 | |
469 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
470 | return -EINVAL; | |
471 | ||
472 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
473 | if (!ops.oobbuf) | |
474 | return -ENOMEM; | |
475 | ||
305b93f1 | 476 | start &= ~((uint64_t)mtd->writesize - 1); |
fd2819bb | 477 | ret = mtd_read_oob(mtd, start, &ops); |
97718540 KC |
478 | |
479 | if (put_user(ops.oobretlen, retp)) | |
480 | ret = -EFAULT; | |
481 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
482 | ops.oobretlen)) | |
483 | ret = -EFAULT; | |
484 | ||
485 | kfree(ops.oobbuf); | |
041e4575 BN |
486 | |
487 | /* | |
488 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
489 | * data. For our userspace tools it is important to dump areas | |
490 | * with ECC errors! | |
491 | * For kernel internal usage it also might return -EUCLEAN | |
492 | * to signal the caller that a bitflip has occured and has | |
493 | * been corrected by the ECC algorithm. | |
494 | * | |
c478d7e4 BN |
495 | * Note: currently the standard NAND function, nand_read_oob_std, |
496 | * does not calculate ECC for the OOB area, so do not rely on | |
497 | * this behavior unless you have replaced it with your own. | |
041e4575 | 498 | */ |
d57f4054 | 499 | if (mtd_is_bitflip_or_eccerr(ret)) |
041e4575 BN |
500 | return 0; |
501 | ||
97718540 KC |
502 | return ret; |
503 | } | |
504 | ||
cc26c3cd BN |
505 | /* |
506 | * Copies (and truncates, if necessary) data from the larger struct, | |
507 | * nand_ecclayout, to the smaller, deprecated layout struct, | |
92394b5c | 508 | * nand_ecclayout_user. This is necessary only to support the deprecated |
cc26c3cd BN |
509 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use |
510 | * nand_ecclayout flexibly (i.e. the struct may change size in new | |
511 | * releases without requiring major rewrites). | |
512 | */ | |
513 | static int shrink_ecclayout(const struct nand_ecclayout *from, | |
514 | struct nand_ecclayout_user *to) | |
515 | { | |
516 | int i; | |
517 | ||
518 | if (!from || !to) | |
519 | return -EINVAL; | |
520 | ||
521 | memset(to, 0, sizeof(*to)); | |
522 | ||
0ceacf36 | 523 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
cc26c3cd BN |
524 | for (i = 0; i < to->eccbytes; i++) |
525 | to->eccpos[i] = from->eccpos[i]; | |
526 | ||
527 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
528 | if (from->oobfree[i].length == 0 && | |
529 | from->oobfree[i].offset == 0) | |
530 | break; | |
531 | to->oobavail += from->oobfree[i].length; | |
532 | to->oobfree[i] = from->oobfree[i]; | |
533 | } | |
534 | ||
535 | return 0; | |
536 | } | |
537 | ||
969e57ad | 538 | static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
d0f7959e RT |
539 | struct blkpg_ioctl_arg __user *arg) |
540 | { | |
541 | struct blkpg_ioctl_arg a; | |
542 | struct blkpg_partition p; | |
543 | ||
544 | if (!capable(CAP_SYS_ADMIN)) | |
545 | return -EPERM; | |
546 | ||
d0f7959e RT |
547 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
548 | return -EFAULT; | |
549 | ||
550 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
551 | return -EFAULT; | |
552 | ||
553 | switch (a.op) { | |
554 | case BLKPG_ADD_PARTITION: | |
555 | ||
a7e93dcd RT |
556 | /* Only master mtd device must be used to add partitions */ |
557 | if (mtd_is_partition(mtd)) | |
558 | return -EINVAL; | |
559 | ||
d0f7959e RT |
560 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
561 | ||
562 | case BLKPG_DEL_PARTITION: | |
563 | ||
564 | if (p.pno < 0) | |
565 | return -EINVAL; | |
566 | ||
567 | return mtd_del_partition(mtd, p.pno); | |
568 | ||
569 | default: | |
570 | return -EINVAL; | |
571 | } | |
572 | } | |
d0f7959e | 573 | |
969e57ad | 574 | static int mtdchar_write_ioctl(struct mtd_info *mtd, |
e99d8b08 BN |
575 | struct mtd_write_req __user *argp) |
576 | { | |
577 | struct mtd_write_req req; | |
578 | struct mtd_oob_ops ops; | |
579 | void __user *usr_data, *usr_oob; | |
580 | int ret; | |
581 | ||
582 | if (copy_from_user(&req, argp, sizeof(req)) || | |
583 | !access_ok(VERIFY_READ, req.usr_data, req.len) || | |
584 | !access_ok(VERIFY_READ, req.usr_oob, req.ooblen)) | |
585 | return -EFAULT; | |
3c3c10bb | 586 | if (!mtd->_write_oob) |
e99d8b08 BN |
587 | return -EOPNOTSUPP; |
588 | ||
589 | ops.mode = req.mode; | |
590 | ops.len = (size_t)req.len; | |
591 | ops.ooblen = (size_t)req.ooblen; | |
592 | ops.ooboffs = 0; | |
593 | ||
594 | usr_data = (void __user *)(uintptr_t)req.usr_data; | |
595 | usr_oob = (void __user *)(uintptr_t)req.usr_oob; | |
596 | ||
597 | if (req.usr_data) { | |
598 | ops.datbuf = memdup_user(usr_data, ops.len); | |
599 | if (IS_ERR(ops.datbuf)) | |
600 | return PTR_ERR(ops.datbuf); | |
601 | } else { | |
602 | ops.datbuf = NULL; | |
603 | } | |
604 | ||
605 | if (req.usr_oob) { | |
606 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); | |
607 | if (IS_ERR(ops.oobbuf)) { | |
608 | kfree(ops.datbuf); | |
609 | return PTR_ERR(ops.oobbuf); | |
610 | } | |
611 | } else { | |
612 | ops.oobbuf = NULL; | |
613 | } | |
614 | ||
a2cc5ba0 | 615 | ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
e99d8b08 BN |
616 | |
617 | kfree(ops.datbuf); | |
618 | kfree(ops.oobbuf); | |
619 | ||
620 | return ret; | |
621 | } | |
622 | ||
969e57ad | 623 | static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 624 | { |
f1a28c02 TG |
625 | struct mtd_file_info *mfi = file->private_data; |
626 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
627 | void __user *argp = (void __user *)arg; |
628 | int ret = 0; | |
629 | u_long size; | |
73c619ea | 630 | struct mtd_info_user info; |
97894cda | 631 | |
289c0522 | 632 | pr_debug("MTD_ioctl\n"); |
1da177e4 LT |
633 | |
634 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
635 | if (cmd & IOC_IN) { | |
636 | if (!access_ok(VERIFY_READ, argp, size)) | |
637 | return -EFAULT; | |
638 | } | |
639 | if (cmd & IOC_OUT) { | |
640 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
641 | return -EFAULT; | |
642 | } | |
97894cda | 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 { | |
698 | wait_queue_head_t waitq; | |
699 | DECLARE_WAITQUEUE(wait, current); | |
700 | ||
701 | init_waitqueue_head(&waitq); | |
702 | ||
0dc54e9f KC |
703 | if (cmd == MEMERASE64) { |
704 | struct erase_info_user64 einfo64; | |
705 | ||
706 | if (copy_from_user(&einfo64, argp, | |
707 | sizeof(struct erase_info_user64))) { | |
708 | kfree(erase); | |
709 | return -EFAULT; | |
710 | } | |
711 | erase->addr = einfo64.start; | |
712 | erase->len = einfo64.length; | |
713 | } else { | |
714 | struct erase_info_user einfo32; | |
715 | ||
716 | if (copy_from_user(&einfo32, argp, | |
717 | sizeof(struct erase_info_user))) { | |
718 | kfree(erase); | |
719 | return -EFAULT; | |
720 | } | |
721 | erase->addr = einfo32.start; | |
722 | erase->len = einfo32.length; | |
1da177e4 LT |
723 | } |
724 | erase->mtd = mtd; | |
725 | erase->callback = mtdchar_erase_callback; | |
726 | erase->priv = (unsigned long)&waitq; | |
97894cda | 727 | |
1da177e4 LT |
728 | /* |
729 | FIXME: Allow INTERRUPTIBLE. Which means | |
730 | not having the wait_queue head on the stack. | |
97894cda | 731 | |
1da177e4 LT |
732 | If the wq_head is on the stack, and we |
733 | leave because we got interrupted, then the | |
734 | wq_head is no longer there when the | |
735 | callback routine tries to wake us up. | |
736 | */ | |
7e1f0dc0 | 737 | ret = mtd_erase(mtd, erase); |
1da177e4 LT |
738 | if (!ret) { |
739 | set_current_state(TASK_UNINTERRUPTIBLE); | |
740 | add_wait_queue(&waitq, &wait); | |
741 | if (erase->state != MTD_ERASE_DONE && | |
742 | erase->state != MTD_ERASE_FAILED) | |
743 | schedule(); | |
744 | remove_wait_queue(&waitq, &wait); | |
745 | set_current_state(TASK_RUNNING); | |
746 | ||
747 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
748 | } | |
749 | kfree(erase); | |
750 | } | |
751 | break; | |
752 | } | |
753 | ||
754 | case MEMWRITEOOB: | |
755 | { | |
756 | struct mtd_oob_buf buf; | |
97718540 | 757 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 758 | |
97718540 KC |
759 | /* NOTE: writes return length to buf_user->length */ |
760 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 761 | ret = -EFAULT; |
97718540 | 762 | else |
969e57ad | 763 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
97718540 | 764 | buf.ptr, &buf_user->length); |
1da177e4 | 765 | break; |
1da177e4 LT |
766 | } |
767 | ||
768 | case MEMREADOOB: | |
769 | { | |
770 | struct mtd_oob_buf buf; | |
97718540 | 771 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 772 | |
97718540 KC |
773 | /* NOTE: writes return length to buf_user->start */ |
774 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 775 | ret = -EFAULT; |
97718540 | 776 | else |
969e57ad | 777 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
97718540 | 778 | buf.ptr, &buf_user->start); |
1da177e4 LT |
779 | break; |
780 | } | |
781 | ||
aea7cea9 KC |
782 | case MEMWRITEOOB64: |
783 | { | |
784 | struct mtd_oob_buf64 buf; | |
785 | struct mtd_oob_buf64 __user *buf_user = argp; | |
786 | ||
787 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
788 | ret = -EFAULT; | |
789 | else | |
969e57ad | 790 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
791 | (void __user *)(uintptr_t)buf.usr_ptr, |
792 | &buf_user->length); | |
793 | break; | |
794 | } | |
795 | ||
796 | case MEMREADOOB64: | |
797 | { | |
798 | struct mtd_oob_buf64 buf; | |
799 | struct mtd_oob_buf64 __user *buf_user = argp; | |
800 | ||
801 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
802 | ret = -EFAULT; | |
803 | else | |
969e57ad | 804 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
805 | (void __user *)(uintptr_t)buf.usr_ptr, |
806 | &buf_user->length); | |
807 | break; | |
808 | } | |
809 | ||
e99d8b08 BN |
810 | case MEMWRITE: |
811 | { | |
969e57ad | 812 | ret = mtdchar_write_ioctl(mtd, |
e99d8b08 BN |
813 | (struct mtd_write_req __user *)arg); |
814 | break; | |
815 | } | |
816 | ||
1da177e4 LT |
817 | case MEMLOCK: |
818 | { | |
175428b2 | 819 | struct erase_info_user einfo; |
1da177e4 | 820 | |
175428b2 | 821 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
822 | return -EFAULT; |
823 | ||
38134565 | 824 | ret = mtd_lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
825 | break; |
826 | } | |
827 | ||
828 | case MEMUNLOCK: | |
829 | { | |
175428b2 | 830 | struct erase_info_user einfo; |
1da177e4 | 831 | |
175428b2 | 832 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
833 | return -EFAULT; |
834 | ||
38134565 | 835 | ret = mtd_unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
836 | break; |
837 | } | |
838 | ||
9938424f RC |
839 | case MEMISLOCKED: |
840 | { | |
841 | struct erase_info_user einfo; | |
842 | ||
843 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
844 | return -EFAULT; | |
845 | ||
38134565 | 846 | ret = mtd_is_locked(mtd, einfo.start, einfo.length); |
9938424f RC |
847 | break; |
848 | } | |
849 | ||
5bd34c09 | 850 | /* Legacy interface */ |
1da177e4 LT |
851 | case MEMGETOOBSEL: |
852 | { | |
5bd34c09 TG |
853 | struct nand_oobinfo oi; |
854 | ||
855 | if (!mtd->ecclayout) | |
856 | return -EOPNOTSUPP; | |
857 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
858 | return -EINVAL; | |
859 | ||
860 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
861 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
862 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
863 | sizeof(oi.oobfree)); | |
d25ade71 | 864 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
865 | |
866 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
867 | return -EFAULT; |
868 | break; | |
869 | } | |
870 | ||
871 | case MEMGETBADBLOCK: | |
872 | { | |
873 | loff_t offs; | |
97894cda | 874 | |
1da177e4 LT |
875 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
876 | return -EFAULT; | |
8f461a73 | 877 | return mtd_block_isbad(mtd, offs); |
1da177e4 LT |
878 | break; |
879 | } | |
880 | ||
881 | case MEMSETBADBLOCK: | |
882 | { | |
883 | loff_t offs; | |
884 | ||
885 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
886 | return -EFAULT; | |
800ffd34 | 887 | return mtd_block_markbad(mtd, offs); |
1da177e4 LT |
888 | break; |
889 | } | |
890 | ||
31f4233b NP |
891 | case OTPSELECT: |
892 | { | |
893 | int mode; | |
894 | if (copy_from_user(&mode, argp, sizeof(int))) | |
895 | return -EFAULT; | |
f1a28c02 | 896 | |
beb133fc | 897 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 TG |
898 | |
899 | ret = otp_select_filemode(mfi, mode); | |
900 | ||
81dba488 | 901 | file->f_pos = 0; |
31f4233b NP |
902 | break; |
903 | } | |
904 | ||
905 | case OTPGETREGIONCOUNT: | |
906 | case OTPGETREGIONINFO: | |
907 | { | |
908 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
909 | if (!buf) | |
910 | return -ENOMEM; | |
f1a28c02 | 911 | switch (mfi->mode) { |
beb133fc | 912 | case MTD_FILE_MODE_OTP_FACTORY: |
87e858a9 | 913 | ret = mtd_get_fact_prot_info(mtd, buf, 4096); |
31f4233b | 914 | break; |
beb133fc | 915 | case MTD_FILE_MODE_OTP_USER: |
87e858a9 | 916 | ret = mtd_get_user_prot_info(mtd, buf, 4096); |
31f4233b | 917 | break; |
f1a28c02 | 918 | default: |
87e858a9 | 919 | ret = -EINVAL; |
f1a28c02 | 920 | break; |
31f4233b NP |
921 | } |
922 | if (ret >= 0) { | |
923 | if (cmd == OTPGETREGIONCOUNT) { | |
924 | int nbr = ret / sizeof(struct otp_info); | |
925 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
926 | } else | |
927 | ret = copy_to_user(argp, buf, ret); | |
928 | if (ret) | |
929 | ret = -EFAULT; | |
930 | } | |
931 | kfree(buf); | |
932 | break; | |
933 | } | |
934 | ||
935 | case OTPLOCK: | |
936 | { | |
175428b2 | 937 | struct otp_info oinfo; |
31f4233b | 938 | |
beb133fc | 939 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
31f4233b | 940 | return -EINVAL; |
175428b2 | 941 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b | 942 | return -EFAULT; |
4403dbfb | 943 | ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
944 | break; |
945 | } | |
31f4233b | 946 | |
7854d3f7 | 947 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
948 | case ECCGETLAYOUT: |
949 | { | |
cc26c3cd BN |
950 | struct nand_ecclayout_user *usrlay; |
951 | ||
f1a28c02 TG |
952 | if (!mtd->ecclayout) |
953 | return -EOPNOTSUPP; | |
954 | ||
cc26c3cd BN |
955 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
956 | if (!usrlay) | |
957 | return -ENOMEM; | |
958 | ||
959 | shrink_ecclayout(mtd->ecclayout, usrlay); | |
960 | ||
961 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
962 | ret = -EFAULT; | |
963 | kfree(usrlay); | |
f1a28c02 TG |
964 | break; |
965 | } | |
966 | ||
967 | case ECCGETSTATS: | |
968 | { | |
969 | if (copy_to_user(argp, &mtd->ecc_stats, | |
970 | sizeof(struct mtd_ecc_stats))) | |
971 | return -EFAULT; | |
972 | break; | |
973 | } | |
974 | ||
975 | case MTDFILEMODE: | |
976 | { | |
977 | mfi->mode = 0; | |
978 | ||
979 | switch(arg) { | |
beb133fc BN |
980 | case MTD_FILE_MODE_OTP_FACTORY: |
981 | case MTD_FILE_MODE_OTP_USER: | |
f1a28c02 TG |
982 | ret = otp_select_filemode(mfi, arg); |
983 | break; | |
984 | ||
beb133fc | 985 | case MTD_FILE_MODE_RAW: |
fc002e3c | 986 | if (!mtd_has_oob(mtd)) |
f1a28c02 TG |
987 | return -EOPNOTSUPP; |
988 | mfi->mode = arg; | |
989 | ||
beb133fc | 990 | case MTD_FILE_MODE_NORMAL: |
f1a28c02 TG |
991 | break; |
992 | default: | |
993 | ret = -EINVAL; | |
994 | } | |
995 | file->f_pos = 0; | |
996 | break; | |
997 | } | |
998 | ||
d0f7959e RT |
999 | case BLKPG: |
1000 | { | |
969e57ad | 1001 | ret = mtdchar_blkpg_ioctl(mtd, |
d0f7959e RT |
1002 | (struct blkpg_ioctl_arg __user *)arg); |
1003 | break; | |
1004 | } | |
1005 | ||
1006 | case BLKRRPART: | |
1007 | { | |
1008 | /* No reread partition feature. Just return ok */ | |
1009 | ret = 0; | |
1010 | break; | |
1011 | } | |
d0f7959e | 1012 | |
1da177e4 LT |
1013 | default: |
1014 | ret = -ENOTTY; | |
1015 | } | |
1016 | ||
1017 | return ret; | |
1018 | } /* memory_ioctl */ | |
1019 | ||
969e57ad | 1020 | static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
55929332 AB |
1021 | { |
1022 | int ret; | |
1023 | ||
5aa82940 | 1024 | mutex_lock(&mtd_mutex); |
969e57ad | 1025 | ret = mtdchar_ioctl(file, cmd, arg); |
5aa82940 | 1026 | mutex_unlock(&mtd_mutex); |
55929332 AB |
1027 | |
1028 | return ret; | |
1029 | } | |
1030 | ||
97718540 KC |
1031 | #ifdef CONFIG_COMPAT |
1032 | ||
1033 | struct mtd_oob_buf32 { | |
1034 | u_int32_t start; | |
1035 | u_int32_t length; | |
1036 | compat_caddr_t ptr; /* unsigned char* */ | |
1037 | }; | |
1038 | ||
1039 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
1040 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
1041 | ||
969e57ad | 1042 | static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, |
97718540 KC |
1043 | unsigned long arg) |
1044 | { | |
1045 | struct mtd_file_info *mfi = file->private_data; | |
1046 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 1047 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1048 | int ret = 0; |
1049 | ||
5aa82940 | 1050 | mutex_lock(&mtd_mutex); |
97718540 KC |
1051 | |
1052 | switch (cmd) { | |
1053 | case MEMWRITEOOB32: | |
1054 | { | |
1055 | struct mtd_oob_buf32 buf; | |
1056 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1057 | ||
1058 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1059 | ret = -EFAULT; | |
1060 | else | |
969e57ad | 1061 | ret = mtdchar_writeoob(file, mtd, buf.start, |
97718540 KC |
1062 | buf.length, compat_ptr(buf.ptr), |
1063 | &buf_user->length); | |
1064 | break; | |
1065 | } | |
1066 | ||
1067 | case MEMREADOOB32: | |
1068 | { | |
1069 | struct mtd_oob_buf32 buf; | |
1070 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1071 | ||
1072 | /* NOTE: writes return length to buf->start */ | |
1073 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1074 | ret = -EFAULT; | |
1075 | else | |
969e57ad | 1076 | ret = mtdchar_readoob(file, mtd, buf.start, |
97718540 KC |
1077 | buf.length, compat_ptr(buf.ptr), |
1078 | &buf_user->start); | |
1079 | break; | |
1080 | } | |
1081 | default: | |
969e57ad | 1082 | ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1083 | } |
1084 | ||
5aa82940 | 1085 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1086 | |
1087 | return ret; | |
1088 | } | |
1089 | ||
1090 | #endif /* CONFIG_COMPAT */ | |
1091 | ||
402d3265 DH |
1092 | /* |
1093 | * try to determine where a shared mapping can be made | |
1094 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1095 | * mappings) | |
1096 | */ | |
1097 | #ifndef CONFIG_MMU | |
969e57ad | 1098 | static unsigned long mtdchar_get_unmapped_area(struct file *file, |
402d3265 DH |
1099 | unsigned long addr, |
1100 | unsigned long len, | |
1101 | unsigned long pgoff, | |
1102 | unsigned long flags) | |
1103 | { | |
1104 | struct mtd_file_info *mfi = file->private_data; | |
1105 | struct mtd_info *mtd = mfi->mtd; | |
cd621274 AB |
1106 | unsigned long offset; |
1107 | int ret; | |
402d3265 | 1108 | |
cd621274 AB |
1109 | if (addr != 0) |
1110 | return (unsigned long) -EINVAL; | |
402d3265 | 1111 | |
cd621274 AB |
1112 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) |
1113 | return (unsigned long) -EINVAL; | |
402d3265 | 1114 | |
cd621274 AB |
1115 | offset = pgoff << PAGE_SHIFT; |
1116 | if (offset > mtd->size - len) | |
1117 | return (unsigned long) -EINVAL; | |
402d3265 | 1118 | |
cd621274 AB |
1119 | ret = mtd_get_unmapped_area(mtd, len, offset, flags); |
1120 | return ret == -EOPNOTSUPP ? -ENOSYS : ret; | |
402d3265 DH |
1121 | } |
1122 | #endif | |
1123 | ||
1124 | /* | |
1125 | * set up a mapping for shared memory segments | |
1126 | */ | |
969e57ad | 1127 | static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) |
402d3265 DH |
1128 | { |
1129 | #ifdef CONFIG_MMU | |
1130 | struct mtd_file_info *mfi = file->private_data; | |
1131 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d | 1132 | struct map_info *map = mtd->priv; |
dd02b67d | 1133 | |
f5cf8f07 DW |
1134 | /* This is broken because it assumes the MTD device is map-based |
1135 | and that mtd->priv is a valid struct map_info. It should be | |
1136 | replaced with something that uses the mtd_get_unmapped_area() | |
1137 | operation properly. */ | |
1138 | if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { | |
dd02b67d | 1139 | #ifdef pgprot_noncached |
8558e4a2 | 1140 | if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) |
dd02b67d AG |
1141 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
1142 | #endif | |
8558e4a2 | 1143 | return vm_iomap_memory(vma, map->phys, map->size); |
dd02b67d | 1144 | } |
402d3265 DH |
1145 | return -ENOSYS; |
1146 | #else | |
1147 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; | |
1148 | #endif | |
1149 | } | |
1150 | ||
d54b1fdb | 1151 | static const struct file_operations mtd_fops = { |
1da177e4 | 1152 | .owner = THIS_MODULE, |
969e57ad AB |
1153 | .llseek = mtdchar_lseek, |
1154 | .read = mtdchar_read, | |
1155 | .write = mtdchar_write, | |
1156 | .unlocked_ioctl = mtdchar_unlocked_ioctl, | |
97718540 | 1157 | #ifdef CONFIG_COMPAT |
969e57ad | 1158 | .compat_ioctl = mtdchar_compat_ioctl, |
97718540 | 1159 | #endif |
969e57ad AB |
1160 | .open = mtdchar_open, |
1161 | .release = mtdchar_close, | |
1162 | .mmap = mtdchar_mmap, | |
402d3265 | 1163 | #ifndef CONFIG_MMU |
969e57ad | 1164 | .get_unmapped_area = mtdchar_get_unmapped_area, |
402d3265 | 1165 | #endif |
1da177e4 LT |
1166 | }; |
1167 | ||
00292bbf AV |
1168 | static const struct super_operations mtd_ops = { |
1169 | .drop_inode = generic_delete_inode, | |
1170 | .statfs = simple_statfs, | |
1171 | }; | |
1172 | ||
51139ada AV |
1173 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
1174 | int flags, const char *dev_name, void *data) | |
cd874237 | 1175 | { |
00292bbf | 1176 | return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC); |
cd874237 KS |
1177 | } |
1178 | ||
1179 | static struct file_system_type mtd_inodefs_type = { | |
1180 | .name = "mtd_inodefs", | |
51139ada | 1181 | .mount = mtd_inodefs_mount, |
cd874237 KS |
1182 | .kill_sb = kill_anon_super, |
1183 | }; | |
7f78e035 | 1184 | MODULE_ALIAS_FS("mtd_inodefs"); |
cd874237 | 1185 | |
660685d9 | 1186 | int __init init_mtdchar(void) |
1da177e4 | 1187 | { |
cd874237 | 1188 | int ret; |
1f24b5a8 | 1189 | |
cd874237 | 1190 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1191 | "mtd", &mtd_fops); |
cd874237 | 1192 | if (ret < 0) { |
57ae2b60 AB |
1193 | pr_err("Can't allocate major number %d for MTD\n", |
1194 | MTD_CHAR_MAJOR); | |
cd874237 | 1195 | return ret; |
9bc7b387 TP |
1196 | } |
1197 | ||
cd874237 KS |
1198 | ret = register_filesystem(&mtd_inodefs_type); |
1199 | if (ret) { | |
57ae2b60 AB |
1200 | pr_err("Can't register mtd_inodefs filesystem, error %d\n", |
1201 | ret); | |
cd874237 KS |
1202 | goto err_unregister_chdev; |
1203 | } | |
57ae2b60 | 1204 | |
cd874237 KS |
1205 | return ret; |
1206 | ||
cd874237 KS |
1207 | err_unregister_chdev: |
1208 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); | |
1209 | return ret; | |
1da177e4 LT |
1210 | } |
1211 | ||
660685d9 | 1212 | void __exit cleanup_mtdchar(void) |
1da177e4 | 1213 | { |
cd874237 | 1214 | unregister_filesystem(&mtd_inodefs_type); |
dad0db31 | 1215 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1216 | } |
1217 | ||
90160e13 | 1218 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |