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> |
1da177e4 | 34 | #include <linux/mtd/mtd.h> |
d0f7959e | 35 | #include <linux/mtd/partitions.h> |
dd02b67d | 36 | #include <linux/mtd/map.h> |
1da177e4 | 37 | |
15fdc52f | 38 | #include <asm/uaccess.h> |
9bc7b387 | 39 | |
cd874237 | 40 | #define MTD_INODE_FS_MAGIC 0x11307854 |
5aa82940 | 41 | static DEFINE_MUTEX(mtd_mutex); |
cd874237 | 42 | static struct vfsmount *mtd_inode_mnt __read_mostly; |
1da177e4 | 43 | |
045e9a5d | 44 | /* |
f1a28c02 | 45 | * Data structure to hold the pointer to the mtd device as well |
92394b5c | 46 | * as mode information of various use cases. |
045e9a5d | 47 | */ |
f1a28c02 TG |
48 | struct mtd_file_info { |
49 | struct mtd_info *mtd; | |
cd874237 | 50 | struct inode *ino; |
f1a28c02 TG |
51 | enum mtd_file_modes mode; |
52 | }; | |
31f4233b | 53 | |
969e57ad | 54 | static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 | 55 | { |
f1a28c02 TG |
56 | struct mtd_file_info *mfi = file->private_data; |
57 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
58 | |
59 | switch (orig) { | |
ea59830d | 60 | case SEEK_SET: |
1da177e4 | 61 | break; |
ea59830d | 62 | case SEEK_CUR: |
8b491d75 | 63 | offset += file->f_pos; |
1da177e4 | 64 | break; |
ea59830d | 65 | case SEEK_END: |
8b491d75 | 66 | offset += mtd->size; |
1da177e4 LT |
67 | break; |
68 | default: | |
69 | return -EINVAL; | |
70 | } | |
71 | ||
1887f517 | 72 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 73 | return file->f_pos = offset; |
1da177e4 | 74 | |
8b491d75 | 75 | return -EINVAL; |
1da177e4 LT |
76 | } |
77 | ||
78 | ||
79 | ||
969e57ad | 80 | static int mtdchar_open(struct inode *inode, struct file *file) |
1da177e4 LT |
81 | { |
82 | int minor = iminor(inode); | |
83 | int devnum = minor >> 1; | |
6071239e | 84 | int ret = 0; |
1da177e4 | 85 | struct mtd_info *mtd; |
f1a28c02 | 86 | struct mtd_file_info *mfi; |
cd874237 | 87 | struct inode *mtd_ino; |
1da177e4 | 88 | |
289c0522 | 89 | pr_debug("MTD_open\n"); |
1da177e4 | 90 | |
1da177e4 | 91 | /* You can't open the RO devices RW */ |
aeb5d727 | 92 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
1da177e4 LT |
93 | return -EACCES; |
94 | ||
5aa82940 | 95 | mutex_lock(&mtd_mutex); |
1da177e4 | 96 | mtd = get_mtd_device(NULL, devnum); |
97894cda | 97 | |
6071239e JC |
98 | if (IS_ERR(mtd)) { |
99 | ret = PTR_ERR(mtd); | |
100 | goto out; | |
101 | } | |
97894cda | 102 | |
402d3265 | 103 | if (mtd->type == MTD_ABSENT) { |
1da177e4 | 104 | put_mtd_device(mtd); |
6071239e JC |
105 | ret = -ENODEV; |
106 | goto out; | |
1da177e4 LT |
107 | } |
108 | ||
cd874237 KS |
109 | mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum); |
110 | if (!mtd_ino) { | |
111 | put_mtd_device(mtd); | |
112 | ret = -ENOMEM; | |
113 | goto out; | |
114 | } | |
115 | if (mtd_ino->i_state & I_NEW) { | |
116 | mtd_ino->i_private = mtd; | |
117 | mtd_ino->i_mode = S_IFCHR; | |
118 | mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; | |
119 | unlock_new_inode(mtd_ino); | |
120 | } | |
121 | file->f_mapping = mtd_ino->i_mapping; | |
402d3265 | 122 | |
1da177e4 | 123 | /* You can't open it RW if it's not a writeable device */ |
aeb5d727 | 124 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
cd874237 | 125 | iput(mtd_ino); |
1da177e4 | 126 | put_mtd_device(mtd); |
6071239e JC |
127 | ret = -EACCES; |
128 | goto out; | |
1da177e4 | 129 | } |
97894cda | 130 | |
f1a28c02 TG |
131 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
132 | if (!mfi) { | |
cd874237 | 133 | iput(mtd_ino); |
f1a28c02 | 134 | put_mtd_device(mtd); |
6071239e JC |
135 | ret = -ENOMEM; |
136 | goto out; | |
f1a28c02 | 137 | } |
cd874237 | 138 | mfi->ino = mtd_ino; |
f1a28c02 TG |
139 | mfi->mtd = mtd; |
140 | file->private_data = mfi; | |
141 | ||
6071239e | 142 | out: |
5aa82940 | 143 | mutex_unlock(&mtd_mutex); |
6071239e | 144 | return ret; |
969e57ad | 145 | } /* mtdchar_open */ |
1da177e4 LT |
146 | |
147 | /*====================================================================*/ | |
148 | ||
969e57ad | 149 | static int mtdchar_close(struct inode *inode, struct file *file) |
1da177e4 | 150 | { |
f1a28c02 TG |
151 | struct mtd_file_info *mfi = file->private_data; |
152 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 | 153 | |
289c0522 | 154 | pr_debug("MTD_close\n"); |
1da177e4 | 155 | |
7eafaed5 | 156 | /* Only sync if opened RW */ |
aeb5d727 | 157 | if ((file->f_mode & FMODE_WRITE) && mtd->sync) |
1da177e4 | 158 | mtd->sync(mtd); |
97894cda | 159 | |
cd874237 KS |
160 | iput(mfi->ino); |
161 | ||
1da177e4 | 162 | put_mtd_device(mtd); |
f1a28c02 TG |
163 | file->private_data = NULL; |
164 | kfree(mfi); | |
1da177e4 LT |
165 | |
166 | return 0; | |
969e57ad | 167 | } /* mtdchar_close */ |
1da177e4 | 168 | |
3e45cf5e GE |
169 | /* Back in June 2001, dwmw2 wrote: |
170 | * | |
171 | * FIXME: This _really_ needs to die. In 2.5, we should lock the | |
172 | * userspace buffer down and use it directly with readv/writev. | |
173 | * | |
174 | * The implementation below, using mtd_kmalloc_up_to, mitigates | |
175 | * allocation failures when the system is under low-memory situations | |
176 | * or if memory is highly fragmented at the cost of reducing the | |
177 | * performance of the requested transfer due to a smaller buffer size. | |
178 | * | |
179 | * A more complex but more memory-efficient implementation based on | |
180 | * get_user_pages and iovecs to cover extents of those pages is a | |
181 | * longer-term goal, as intimated by dwmw2 above. However, for the | |
182 | * write case, this requires yet more complex head and tail transfer | |
183 | * handling when those head and tail offsets and sizes are such that | |
184 | * alignment requirements are not met in the NAND subdriver. | |
185 | */ | |
1da177e4 | 186 | |
969e57ad AB |
187 | static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
188 | loff_t *ppos) | |
1da177e4 | 189 | { |
f1a28c02 TG |
190 | struct mtd_file_info *mfi = file->private_data; |
191 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
192 | size_t retlen=0; |
193 | size_t total_retlen=0; | |
194 | int ret=0; | |
195 | int len; | |
3e45cf5e | 196 | size_t size = count; |
1da177e4 | 197 | char *kbuf; |
97894cda | 198 | |
289c0522 | 199 | pr_debug("MTD_read\n"); |
1da177e4 LT |
200 | |
201 | if (*ppos + count > mtd->size) | |
202 | count = mtd->size - *ppos; | |
203 | ||
204 | if (!count) | |
205 | return 0; | |
97894cda | 206 | |
3e45cf5e | 207 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
208 | if (!kbuf) |
209 | return -ENOMEM; | |
210 | ||
1da177e4 | 211 | while (count) { |
3e45cf5e | 212 | len = min_t(size_t, count, size); |
1da177e4 | 213 | |
f1a28c02 | 214 | switch (mfi->mode) { |
beb133fc | 215 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
216 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
217 | break; | |
beb133fc | 218 | case MTD_FILE_MODE_OTP_USER: |
31f4233b NP |
219 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
220 | break; | |
beb133fc | 221 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
222 | { |
223 | struct mtd_oob_ops ops; | |
224 | ||
0612b9dd | 225 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
226 | ops.datbuf = kbuf; |
227 | ops.oobbuf = NULL; | |
228 | ops.len = len; | |
229 | ||
fd2819bb | 230 | ret = mtd_read_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
231 | retlen = ops.retlen; |
232 | break; | |
233 | } | |
31f4233b | 234 | default: |
329ad399 | 235 | ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 236 | } |
7854d3f7 | 237 | /* Nand returns -EBADMSG on ECC errors, but it returns |
1da177e4 | 238 | * the data. For our userspace tools it is important |
7854d3f7 | 239 | * to dump areas with ECC errors! |
9a1fcdfd | 240 | * For kernel internal usage it also might return -EUCLEAN |
25985edc | 241 | * to signal the caller that a bitflip has occurred and has |
9a1fcdfd | 242 | * been corrected by the ECC algorithm. |
1da177e4 LT |
243 | * Userspace software which accesses NAND this way |
244 | * must be aware of the fact that it deals with NAND | |
245 | */ | |
d57f4054 | 246 | if (!ret || mtd_is_bitflip_or_eccerr(ret)) { |
1da177e4 LT |
247 | *ppos += retlen; |
248 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 249 | kfree(kbuf); |
1da177e4 LT |
250 | return -EFAULT; |
251 | } | |
252 | else | |
253 | total_retlen += retlen; | |
254 | ||
255 | count -= retlen; | |
256 | buf += retlen; | |
31f4233b NP |
257 | if (retlen == 0) |
258 | count = 0; | |
1da177e4 LT |
259 | } |
260 | else { | |
261 | kfree(kbuf); | |
262 | return ret; | |
263 | } | |
97894cda | 264 | |
1da177e4 LT |
265 | } |
266 | ||
b802c074 | 267 | kfree(kbuf); |
1da177e4 | 268 | return total_retlen; |
969e57ad | 269 | } /* mtdchar_read */ |
1da177e4 | 270 | |
969e57ad AB |
271 | static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
272 | loff_t *ppos) | |
1da177e4 | 273 | { |
f1a28c02 TG |
274 | struct mtd_file_info *mfi = file->private_data; |
275 | struct mtd_info *mtd = mfi->mtd; | |
3e45cf5e | 276 | size_t size = count; |
1da177e4 LT |
277 | char *kbuf; |
278 | size_t retlen; | |
279 | size_t total_retlen=0; | |
280 | int ret=0; | |
281 | int len; | |
282 | ||
289c0522 | 283 | pr_debug("MTD_write\n"); |
97894cda | 284 | |
1da177e4 LT |
285 | if (*ppos == mtd->size) |
286 | return -ENOSPC; | |
97894cda | 287 | |
1da177e4 LT |
288 | if (*ppos + count > mtd->size) |
289 | count = mtd->size - *ppos; | |
290 | ||
291 | if (!count) | |
292 | return 0; | |
293 | ||
3e45cf5e | 294 | kbuf = mtd_kmalloc_up_to(mtd, &size); |
b802c074 TG |
295 | if (!kbuf) |
296 | return -ENOMEM; | |
297 | ||
1da177e4 | 298 | while (count) { |
3e45cf5e | 299 | len = min_t(size_t, count, size); |
1da177e4 | 300 | |
1da177e4 LT |
301 | if (copy_from_user(kbuf, buf, len)) { |
302 | kfree(kbuf); | |
303 | return -EFAULT; | |
304 | } | |
97894cda | 305 | |
f1a28c02 | 306 | switch (mfi->mode) { |
beb133fc | 307 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b NP |
308 | ret = -EROFS; |
309 | break; | |
beb133fc | 310 | case MTD_FILE_MODE_OTP_USER: |
31f4233b NP |
311 | if (!mtd->write_user_prot_reg) { |
312 | ret = -EOPNOTSUPP; | |
313 | break; | |
314 | } | |
315 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
316 | break; | |
f1a28c02 | 317 | |
beb133fc | 318 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
319 | { |
320 | struct mtd_oob_ops ops; | |
321 | ||
0612b9dd | 322 | ops.mode = MTD_OPS_RAW; |
f1a28c02 TG |
323 | ops.datbuf = kbuf; |
324 | ops.oobbuf = NULL; | |
bf514081 | 325 | ops.ooboffs = 0; |
f1a28c02 TG |
326 | ops.len = len; |
327 | ||
a2cc5ba0 | 328 | ret = mtd_write_oob(mtd, *ppos, &ops); |
f1a28c02 TG |
329 | retlen = ops.retlen; |
330 | break; | |
331 | } | |
332 | ||
31f4233b | 333 | default: |
eda95cbf | 334 | ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 335 | } |
1da177e4 LT |
336 | if (!ret) { |
337 | *ppos += retlen; | |
338 | total_retlen += retlen; | |
339 | count -= retlen; | |
340 | buf += retlen; | |
341 | } | |
342 | else { | |
343 | kfree(kbuf); | |
344 | return ret; | |
345 | } | |
1da177e4 LT |
346 | } |
347 | ||
b802c074 | 348 | kfree(kbuf); |
1da177e4 | 349 | return total_retlen; |
969e57ad | 350 | } /* mtdchar_write */ |
1da177e4 LT |
351 | |
352 | /*====================================================================== | |
353 | ||
354 | IOCTL calls for getting device parameters. | |
355 | ||
356 | ======================================================================*/ | |
357 | static void mtdchar_erase_callback (struct erase_info *instr) | |
358 | { | |
359 | wake_up((wait_queue_head_t *)instr->priv); | |
360 | } | |
361 | ||
34a82443 | 362 | #ifdef CONFIG_HAVE_MTD_OTP |
f1a28c02 TG |
363 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
364 | { | |
365 | struct mtd_info *mtd = mfi->mtd; | |
366 | int ret = 0; | |
367 | ||
368 | switch (mode) { | |
369 | case MTD_OTP_FACTORY: | |
370 | if (!mtd->read_fact_prot_reg) | |
371 | ret = -EOPNOTSUPP; | |
372 | else | |
beb133fc | 373 | mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
f1a28c02 TG |
374 | break; |
375 | case MTD_OTP_USER: | |
376 | if (!mtd->read_fact_prot_reg) | |
377 | ret = -EOPNOTSUPP; | |
378 | else | |
beb133fc | 379 | mfi->mode = MTD_FILE_MODE_OTP_USER; |
f1a28c02 TG |
380 | break; |
381 | default: | |
382 | ret = -EINVAL; | |
383 | case MTD_OTP_OFF: | |
384 | break; | |
385 | } | |
386 | return ret; | |
387 | } | |
388 | #else | |
389 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
390 | #endif | |
391 | ||
969e57ad | 392 | static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, |
97718540 KC |
393 | uint64_t start, uint32_t length, void __user *ptr, |
394 | uint32_t __user *retp) | |
395 | { | |
9ce244b3 | 396 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
397 | struct mtd_oob_ops ops; |
398 | uint32_t retlen; | |
399 | int ret = 0; | |
400 | ||
401 | if (!(file->f_mode & FMODE_WRITE)) | |
402 | return -EPERM; | |
403 | ||
404 | if (length > 4096) | |
405 | return -EINVAL; | |
406 | ||
407 | if (!mtd->write_oob) | |
408 | ret = -EOPNOTSUPP; | |
409 | else | |
0040476b | 410 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; |
97718540 KC |
411 | |
412 | if (ret) | |
413 | return ret; | |
414 | ||
415 | ops.ooblen = length; | |
305b93f1 | 416 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 417 | ops.datbuf = NULL; |
beb133fc | 418 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 419 | MTD_OPS_PLACE_OOB; |
97718540 KC |
420 | |
421 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
422 | return -EINVAL; | |
423 | ||
df1f1d1c JL |
424 | ops.oobbuf = memdup_user(ptr, length); |
425 | if (IS_ERR(ops.oobbuf)) | |
426 | return PTR_ERR(ops.oobbuf); | |
97718540 | 427 | |
305b93f1 | 428 | start &= ~((uint64_t)mtd->writesize - 1); |
a2cc5ba0 | 429 | ret = mtd_write_oob(mtd, start, &ops); |
97718540 KC |
430 | |
431 | if (ops.oobretlen > 0xFFFFFFFFU) | |
432 | ret = -EOVERFLOW; | |
433 | retlen = ops.oobretlen; | |
434 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
435 | ret = -EFAULT; | |
436 | ||
437 | kfree(ops.oobbuf); | |
438 | return ret; | |
439 | } | |
440 | ||
969e57ad | 441 | static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
c46f6483 BN |
442 | uint64_t start, uint32_t length, void __user *ptr, |
443 | uint32_t __user *retp) | |
97718540 | 444 | { |
c46f6483 | 445 | struct mtd_file_info *mfi = file->private_data; |
97718540 KC |
446 | struct mtd_oob_ops ops; |
447 | int ret = 0; | |
448 | ||
449 | if (length > 4096) | |
450 | return -EINVAL; | |
451 | ||
452 | if (!mtd->read_oob) | |
453 | ret = -EOPNOTSUPP; | |
454 | else | |
455 | ret = access_ok(VERIFY_WRITE, ptr, | |
456 | length) ? 0 : -EFAULT; | |
457 | if (ret) | |
458 | return ret; | |
459 | ||
460 | ops.ooblen = length; | |
305b93f1 | 461 | ops.ooboffs = start & (mtd->writesize - 1); |
97718540 | 462 | ops.datbuf = NULL; |
beb133fc | 463 | ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
0612b9dd | 464 | MTD_OPS_PLACE_OOB; |
97718540 KC |
465 | |
466 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
467 | return -EINVAL; | |
468 | ||
469 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
470 | if (!ops.oobbuf) | |
471 | return -ENOMEM; | |
472 | ||
305b93f1 | 473 | start &= ~((uint64_t)mtd->writesize - 1); |
fd2819bb | 474 | ret = mtd_read_oob(mtd, start, &ops); |
97718540 KC |
475 | |
476 | if (put_user(ops.oobretlen, retp)) | |
477 | ret = -EFAULT; | |
478 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
479 | ops.oobretlen)) | |
480 | ret = -EFAULT; | |
481 | ||
482 | kfree(ops.oobbuf); | |
041e4575 BN |
483 | |
484 | /* | |
485 | * NAND returns -EBADMSG on ECC errors, but it returns the OOB | |
486 | * data. For our userspace tools it is important to dump areas | |
487 | * with ECC errors! | |
488 | * For kernel internal usage it also might return -EUCLEAN | |
489 | * to signal the caller that a bitflip has occured and has | |
490 | * been corrected by the ECC algorithm. | |
491 | * | |
c478d7e4 BN |
492 | * Note: currently the standard NAND function, nand_read_oob_std, |
493 | * does not calculate ECC for the OOB area, so do not rely on | |
494 | * this behavior unless you have replaced it with your own. | |
041e4575 | 495 | */ |
d57f4054 | 496 | if (mtd_is_bitflip_or_eccerr(ret)) |
041e4575 BN |
497 | return 0; |
498 | ||
97718540 KC |
499 | return ret; |
500 | } | |
501 | ||
cc26c3cd BN |
502 | /* |
503 | * Copies (and truncates, if necessary) data from the larger struct, | |
504 | * nand_ecclayout, to the smaller, deprecated layout struct, | |
92394b5c | 505 | * nand_ecclayout_user. This is necessary only to support the deprecated |
cc26c3cd BN |
506 | * API ioctl ECCGETLAYOUT while allowing all new functionality to use |
507 | * nand_ecclayout flexibly (i.e. the struct may change size in new | |
508 | * releases without requiring major rewrites). | |
509 | */ | |
510 | static int shrink_ecclayout(const struct nand_ecclayout *from, | |
511 | struct nand_ecclayout_user *to) | |
512 | { | |
513 | int i; | |
514 | ||
515 | if (!from || !to) | |
516 | return -EINVAL; | |
517 | ||
518 | memset(to, 0, sizeof(*to)); | |
519 | ||
0ceacf36 | 520 | to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); |
cc26c3cd BN |
521 | for (i = 0; i < to->eccbytes; i++) |
522 | to->eccpos[i] = from->eccpos[i]; | |
523 | ||
524 | for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { | |
525 | if (from->oobfree[i].length == 0 && | |
526 | from->oobfree[i].offset == 0) | |
527 | break; | |
528 | to->oobavail += from->oobfree[i].length; | |
529 | to->oobfree[i] = from->oobfree[i]; | |
530 | } | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
969e57ad | 535 | static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
d0f7959e RT |
536 | struct blkpg_ioctl_arg __user *arg) |
537 | { | |
538 | struct blkpg_ioctl_arg a; | |
539 | struct blkpg_partition p; | |
540 | ||
541 | if (!capable(CAP_SYS_ADMIN)) | |
542 | return -EPERM; | |
543 | ||
d0f7959e RT |
544 | if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) |
545 | return -EFAULT; | |
546 | ||
547 | if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) | |
548 | return -EFAULT; | |
549 | ||
550 | switch (a.op) { | |
551 | case BLKPG_ADD_PARTITION: | |
552 | ||
a7e93dcd RT |
553 | /* Only master mtd device must be used to add partitions */ |
554 | if (mtd_is_partition(mtd)) | |
555 | return -EINVAL; | |
556 | ||
d0f7959e RT |
557 | return mtd_add_partition(mtd, p.devname, p.start, p.length); |
558 | ||
559 | case BLKPG_DEL_PARTITION: | |
560 | ||
561 | if (p.pno < 0) | |
562 | return -EINVAL; | |
563 | ||
564 | return mtd_del_partition(mtd, p.pno); | |
565 | ||
566 | default: | |
567 | return -EINVAL; | |
568 | } | |
569 | } | |
d0f7959e | 570 | |
969e57ad | 571 | static int mtdchar_write_ioctl(struct mtd_info *mtd, |
e99d8b08 BN |
572 | struct mtd_write_req __user *argp) |
573 | { | |
574 | struct mtd_write_req req; | |
575 | struct mtd_oob_ops ops; | |
576 | void __user *usr_data, *usr_oob; | |
577 | int ret; | |
578 | ||
579 | if (copy_from_user(&req, argp, sizeof(req)) || | |
580 | !access_ok(VERIFY_READ, req.usr_data, req.len) || | |
581 | !access_ok(VERIFY_READ, req.usr_oob, req.ooblen)) | |
582 | return -EFAULT; | |
583 | if (!mtd->write_oob) | |
584 | return -EOPNOTSUPP; | |
585 | ||
586 | ops.mode = req.mode; | |
587 | ops.len = (size_t)req.len; | |
588 | ops.ooblen = (size_t)req.ooblen; | |
589 | ops.ooboffs = 0; | |
590 | ||
591 | usr_data = (void __user *)(uintptr_t)req.usr_data; | |
592 | usr_oob = (void __user *)(uintptr_t)req.usr_oob; | |
593 | ||
594 | if (req.usr_data) { | |
595 | ops.datbuf = memdup_user(usr_data, ops.len); | |
596 | if (IS_ERR(ops.datbuf)) | |
597 | return PTR_ERR(ops.datbuf); | |
598 | } else { | |
599 | ops.datbuf = NULL; | |
600 | } | |
601 | ||
602 | if (req.usr_oob) { | |
603 | ops.oobbuf = memdup_user(usr_oob, ops.ooblen); | |
604 | if (IS_ERR(ops.oobbuf)) { | |
605 | kfree(ops.datbuf); | |
606 | return PTR_ERR(ops.oobbuf); | |
607 | } | |
608 | } else { | |
609 | ops.oobbuf = NULL; | |
610 | } | |
611 | ||
a2cc5ba0 | 612 | ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
e99d8b08 BN |
613 | |
614 | kfree(ops.datbuf); | |
615 | kfree(ops.oobbuf); | |
616 | ||
617 | return ret; | |
618 | } | |
619 | ||
969e57ad | 620 | static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
1da177e4 | 621 | { |
f1a28c02 TG |
622 | struct mtd_file_info *mfi = file->private_data; |
623 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
624 | void __user *argp = (void __user *)arg; |
625 | int ret = 0; | |
626 | u_long size; | |
73c619ea | 627 | struct mtd_info_user info; |
97894cda | 628 | |
289c0522 | 629 | pr_debug("MTD_ioctl\n"); |
1da177e4 LT |
630 | |
631 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
632 | if (cmd & IOC_IN) { | |
633 | if (!access_ok(VERIFY_READ, argp, size)) | |
634 | return -EFAULT; | |
635 | } | |
636 | if (cmd & IOC_OUT) { | |
637 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
638 | return -EFAULT; | |
639 | } | |
97894cda | 640 | |
1da177e4 LT |
641 | switch (cmd) { |
642 | case MEMGETREGIONCOUNT: | |
643 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
644 | return -EFAULT; | |
645 | break; | |
646 | ||
647 | case MEMGETREGIONINFO: | |
648 | { | |
b67c5f87 ZW |
649 | uint32_t ur_idx; |
650 | struct mtd_erase_region_info *kr; | |
bcc98a46 | 651 | struct region_info_user __user *ur = argp; |
1da177e4 | 652 | |
b67c5f87 | 653 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
654 | return -EFAULT; |
655 | ||
5e59be1f DC |
656 | if (ur_idx >= mtd->numeraseregions) |
657 | return -EINVAL; | |
658 | ||
b67c5f87 ZW |
659 | kr = &(mtd->eraseregions[ur_idx]); |
660 | ||
661 | if (put_user(kr->offset, &(ur->offset)) | |
662 | || put_user(kr->erasesize, &(ur->erasesize)) | |
663 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 664 | return -EFAULT; |
b67c5f87 | 665 | |
1da177e4 LT |
666 | break; |
667 | } | |
668 | ||
669 | case MEMGETINFO: | |
a0c5a394 | 670 | memset(&info, 0, sizeof(info)); |
73c619ea JE |
671 | info.type = mtd->type; |
672 | info.flags = mtd->flags; | |
673 | info.size = mtd->size; | |
674 | info.erasesize = mtd->erasesize; | |
675 | info.writesize = mtd->writesize; | |
676 | info.oobsize = mtd->oobsize; | |
19fb4341 BN |
677 | /* The below field is obsolete */ |
678 | info.padding = 0; | |
73c619ea | 679 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
680 | return -EFAULT; |
681 | break; | |
682 | ||
683 | case MEMERASE: | |
0dc54e9f | 684 | case MEMERASE64: |
1da177e4 LT |
685 | { |
686 | struct erase_info *erase; | |
687 | ||
aeb5d727 | 688 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
689 | return -EPERM; |
690 | ||
95b93a0c | 691 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
692 | if (!erase) |
693 | ret = -ENOMEM; | |
694 | else { | |
695 | wait_queue_head_t waitq; | |
696 | DECLARE_WAITQUEUE(wait, current); | |
697 | ||
698 | init_waitqueue_head(&waitq); | |
699 | ||
0dc54e9f KC |
700 | if (cmd == MEMERASE64) { |
701 | struct erase_info_user64 einfo64; | |
702 | ||
703 | if (copy_from_user(&einfo64, argp, | |
704 | sizeof(struct erase_info_user64))) { | |
705 | kfree(erase); | |
706 | return -EFAULT; | |
707 | } | |
708 | erase->addr = einfo64.start; | |
709 | erase->len = einfo64.length; | |
710 | } else { | |
711 | struct erase_info_user einfo32; | |
712 | ||
713 | if (copy_from_user(&einfo32, argp, | |
714 | sizeof(struct erase_info_user))) { | |
715 | kfree(erase); | |
716 | return -EFAULT; | |
717 | } | |
718 | erase->addr = einfo32.start; | |
719 | erase->len = einfo32.length; | |
1da177e4 LT |
720 | } |
721 | erase->mtd = mtd; | |
722 | erase->callback = mtdchar_erase_callback; | |
723 | erase->priv = (unsigned long)&waitq; | |
97894cda | 724 | |
1da177e4 LT |
725 | /* |
726 | FIXME: Allow INTERRUPTIBLE. Which means | |
727 | not having the wait_queue head on the stack. | |
97894cda | 728 | |
1da177e4 LT |
729 | If the wq_head is on the stack, and we |
730 | leave because we got interrupted, then the | |
731 | wq_head is no longer there when the | |
732 | callback routine tries to wake us up. | |
733 | */ | |
7e1f0dc0 | 734 | ret = mtd_erase(mtd, erase); |
1da177e4 LT |
735 | if (!ret) { |
736 | set_current_state(TASK_UNINTERRUPTIBLE); | |
737 | add_wait_queue(&waitq, &wait); | |
738 | if (erase->state != MTD_ERASE_DONE && | |
739 | erase->state != MTD_ERASE_FAILED) | |
740 | schedule(); | |
741 | remove_wait_queue(&waitq, &wait); | |
742 | set_current_state(TASK_RUNNING); | |
743 | ||
744 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
745 | } | |
746 | kfree(erase); | |
747 | } | |
748 | break; | |
749 | } | |
750 | ||
751 | case MEMWRITEOOB: | |
752 | { | |
753 | struct mtd_oob_buf buf; | |
97718540 | 754 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 755 | |
97718540 KC |
756 | /* NOTE: writes return length to buf_user->length */ |
757 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 758 | ret = -EFAULT; |
97718540 | 759 | else |
969e57ad | 760 | ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, |
97718540 | 761 | buf.ptr, &buf_user->length); |
1da177e4 | 762 | break; |
1da177e4 LT |
763 | } |
764 | ||
765 | case MEMREADOOB: | |
766 | { | |
767 | struct mtd_oob_buf buf; | |
97718540 | 768 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 769 | |
97718540 KC |
770 | /* NOTE: writes return length to buf_user->start */ |
771 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 772 | ret = -EFAULT; |
97718540 | 773 | else |
969e57ad | 774 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
97718540 | 775 | buf.ptr, &buf_user->start); |
1da177e4 LT |
776 | break; |
777 | } | |
778 | ||
aea7cea9 KC |
779 | case MEMWRITEOOB64: |
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_writeoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
788 | (void __user *)(uintptr_t)buf.usr_ptr, |
789 | &buf_user->length); | |
790 | break; | |
791 | } | |
792 | ||
793 | case MEMREADOOB64: | |
794 | { | |
795 | struct mtd_oob_buf64 buf; | |
796 | struct mtd_oob_buf64 __user *buf_user = argp; | |
797 | ||
798 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
799 | ret = -EFAULT; | |
800 | else | |
969e57ad | 801 | ret = mtdchar_readoob(file, mtd, buf.start, buf.length, |
aea7cea9 KC |
802 | (void __user *)(uintptr_t)buf.usr_ptr, |
803 | &buf_user->length); | |
804 | break; | |
805 | } | |
806 | ||
e99d8b08 BN |
807 | case MEMWRITE: |
808 | { | |
969e57ad | 809 | ret = mtdchar_write_ioctl(mtd, |
e99d8b08 BN |
810 | (struct mtd_write_req __user *)arg); |
811 | break; | |
812 | } | |
813 | ||
1da177e4 LT |
814 | case MEMLOCK: |
815 | { | |
175428b2 | 816 | struct erase_info_user einfo; |
1da177e4 | 817 | |
175428b2 | 818 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
819 | return -EFAULT; |
820 | ||
821 | if (!mtd->lock) | |
822 | ret = -EOPNOTSUPP; | |
823 | else | |
175428b2 | 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 | ||
835 | if (!mtd->unlock) | |
836 | ret = -EOPNOTSUPP; | |
837 | else | |
175428b2 | 838 | ret = mtd->unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
839 | break; |
840 | } | |
841 | ||
9938424f RC |
842 | case MEMISLOCKED: |
843 | { | |
844 | struct erase_info_user einfo; | |
845 | ||
846 | if (copy_from_user(&einfo, argp, sizeof(einfo))) | |
847 | return -EFAULT; | |
848 | ||
849 | if (!mtd->is_locked) | |
850 | ret = -EOPNOTSUPP; | |
851 | else | |
852 | ret = mtd->is_locked(mtd, einfo.start, einfo.length); | |
853 | break; | |
854 | } | |
855 | ||
5bd34c09 | 856 | /* Legacy interface */ |
1da177e4 LT |
857 | case MEMGETOOBSEL: |
858 | { | |
5bd34c09 TG |
859 | struct nand_oobinfo oi; |
860 | ||
861 | if (!mtd->ecclayout) | |
862 | return -EOPNOTSUPP; | |
863 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
864 | return -EINVAL; | |
865 | ||
866 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
867 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
868 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
869 | sizeof(oi.oobfree)); | |
d25ade71 | 870 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
871 | |
872 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
873 | return -EFAULT; |
874 | break; | |
875 | } | |
876 | ||
877 | case MEMGETBADBLOCK: | |
878 | { | |
879 | loff_t offs; | |
97894cda | 880 | |
1da177e4 LT |
881 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
882 | return -EFAULT; | |
883 | if (!mtd->block_isbad) | |
884 | ret = -EOPNOTSUPP; | |
885 | else | |
886 | return mtd->block_isbad(mtd, offs); | |
887 | break; | |
888 | } | |
889 | ||
890 | case MEMSETBADBLOCK: | |
891 | { | |
892 | loff_t offs; | |
893 | ||
894 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
895 | return -EFAULT; | |
896 | if (!mtd->block_markbad) | |
897 | ret = -EOPNOTSUPP; | |
898 | else | |
899 | return mtd->block_markbad(mtd, offs); | |
900 | break; | |
901 | } | |
902 | ||
34a82443 | 903 | #ifdef CONFIG_HAVE_MTD_OTP |
31f4233b NP |
904 | case OTPSELECT: |
905 | { | |
906 | int mode; | |
907 | if (copy_from_user(&mode, argp, sizeof(int))) | |
908 | return -EFAULT; | |
f1a28c02 | 909 | |
beb133fc | 910 | mfi->mode = MTD_FILE_MODE_NORMAL; |
f1a28c02 TG |
911 | |
912 | ret = otp_select_filemode(mfi, mode); | |
913 | ||
81dba488 | 914 | file->f_pos = 0; |
31f4233b NP |
915 | break; |
916 | } | |
917 | ||
918 | case OTPGETREGIONCOUNT: | |
919 | case OTPGETREGIONINFO: | |
920 | { | |
921 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
922 | if (!buf) | |
923 | return -ENOMEM; | |
924 | ret = -EOPNOTSUPP; | |
f1a28c02 | 925 | switch (mfi->mode) { |
beb133fc | 926 | case MTD_FILE_MODE_OTP_FACTORY: |
31f4233b | 927 | if (mtd->get_fact_prot_info) |
a750b5ce | 928 | ret = mtd_get_fact_prot_info(mtd, buf, 4096); |
31f4233b | 929 | break; |
beb133fc | 930 | case MTD_FILE_MODE_OTP_USER: |
31f4233b NP |
931 | if (mtd->get_user_prot_info) |
932 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
933 | break; | |
f1a28c02 TG |
934 | default: |
935 | break; | |
31f4233b NP |
936 | } |
937 | if (ret >= 0) { | |
938 | if (cmd == OTPGETREGIONCOUNT) { | |
939 | int nbr = ret / sizeof(struct otp_info); | |
940 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
941 | } else | |
942 | ret = copy_to_user(argp, buf, ret); | |
943 | if (ret) | |
944 | ret = -EFAULT; | |
945 | } | |
946 | kfree(buf); | |
947 | break; | |
948 | } | |
949 | ||
950 | case OTPLOCK: | |
951 | { | |
175428b2 | 952 | struct otp_info oinfo; |
31f4233b | 953 | |
beb133fc | 954 | if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
31f4233b | 955 | return -EINVAL; |
175428b2 | 956 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b NP |
957 | return -EFAULT; |
958 | if (!mtd->lock_user_prot_reg) | |
959 | return -EOPNOTSUPP; | |
175428b2 | 960 | ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
961 | break; |
962 | } | |
963 | #endif | |
964 | ||
7854d3f7 | 965 | /* This ioctl is being deprecated - it truncates the ECC layout */ |
f1a28c02 TG |
966 | case ECCGETLAYOUT: |
967 | { | |
cc26c3cd BN |
968 | struct nand_ecclayout_user *usrlay; |
969 | ||
f1a28c02 TG |
970 | if (!mtd->ecclayout) |
971 | return -EOPNOTSUPP; | |
972 | ||
cc26c3cd BN |
973 | usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
974 | if (!usrlay) | |
975 | return -ENOMEM; | |
976 | ||
977 | shrink_ecclayout(mtd->ecclayout, usrlay); | |
978 | ||
979 | if (copy_to_user(argp, usrlay, sizeof(*usrlay))) | |
980 | ret = -EFAULT; | |
981 | kfree(usrlay); | |
f1a28c02 TG |
982 | break; |
983 | } | |
984 | ||
985 | case ECCGETSTATS: | |
986 | { | |
987 | if (copy_to_user(argp, &mtd->ecc_stats, | |
988 | sizeof(struct mtd_ecc_stats))) | |
989 | return -EFAULT; | |
990 | break; | |
991 | } | |
992 | ||
993 | case MTDFILEMODE: | |
994 | { | |
995 | mfi->mode = 0; | |
996 | ||
997 | switch(arg) { | |
beb133fc BN |
998 | case MTD_FILE_MODE_OTP_FACTORY: |
999 | case MTD_FILE_MODE_OTP_USER: | |
f1a28c02 TG |
1000 | ret = otp_select_filemode(mfi, arg); |
1001 | break; | |
1002 | ||
beb133fc | 1003 | case MTD_FILE_MODE_RAW: |
f1a28c02 TG |
1004 | if (!mtd->read_oob || !mtd->write_oob) |
1005 | return -EOPNOTSUPP; | |
1006 | mfi->mode = arg; | |
1007 | ||
beb133fc | 1008 | case MTD_FILE_MODE_NORMAL: |
f1a28c02 TG |
1009 | break; |
1010 | default: | |
1011 | ret = -EINVAL; | |
1012 | } | |
1013 | file->f_pos = 0; | |
1014 | break; | |
1015 | } | |
1016 | ||
d0f7959e RT |
1017 | case BLKPG: |
1018 | { | |
969e57ad | 1019 | ret = mtdchar_blkpg_ioctl(mtd, |
d0f7959e RT |
1020 | (struct blkpg_ioctl_arg __user *)arg); |
1021 | break; | |
1022 | } | |
1023 | ||
1024 | case BLKRRPART: | |
1025 | { | |
1026 | /* No reread partition feature. Just return ok */ | |
1027 | ret = 0; | |
1028 | break; | |
1029 | } | |
d0f7959e | 1030 | |
1da177e4 LT |
1031 | default: |
1032 | ret = -ENOTTY; | |
1033 | } | |
1034 | ||
1035 | return ret; | |
1036 | } /* memory_ioctl */ | |
1037 | ||
969e57ad | 1038 | static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
55929332 AB |
1039 | { |
1040 | int ret; | |
1041 | ||
5aa82940 | 1042 | mutex_lock(&mtd_mutex); |
969e57ad | 1043 | ret = mtdchar_ioctl(file, cmd, arg); |
5aa82940 | 1044 | mutex_unlock(&mtd_mutex); |
55929332 AB |
1045 | |
1046 | return ret; | |
1047 | } | |
1048 | ||
97718540 KC |
1049 | #ifdef CONFIG_COMPAT |
1050 | ||
1051 | struct mtd_oob_buf32 { | |
1052 | u_int32_t start; | |
1053 | u_int32_t length; | |
1054 | compat_caddr_t ptr; /* unsigned char* */ | |
1055 | }; | |
1056 | ||
1057 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
1058 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
1059 | ||
969e57ad | 1060 | static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, |
97718540 KC |
1061 | unsigned long arg) |
1062 | { | |
1063 | struct mtd_file_info *mfi = file->private_data; | |
1064 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 1065 | void __user *argp = compat_ptr(arg); |
97718540 KC |
1066 | int ret = 0; |
1067 | ||
5aa82940 | 1068 | mutex_lock(&mtd_mutex); |
97718540 KC |
1069 | |
1070 | switch (cmd) { | |
1071 | case MEMWRITEOOB32: | |
1072 | { | |
1073 | struct mtd_oob_buf32 buf; | |
1074 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1075 | ||
1076 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1077 | ret = -EFAULT; | |
1078 | else | |
969e57ad | 1079 | ret = mtdchar_writeoob(file, mtd, buf.start, |
97718540 KC |
1080 | buf.length, compat_ptr(buf.ptr), |
1081 | &buf_user->length); | |
1082 | break; | |
1083 | } | |
1084 | ||
1085 | case MEMREADOOB32: | |
1086 | { | |
1087 | struct mtd_oob_buf32 buf; | |
1088 | struct mtd_oob_buf32 __user *buf_user = argp; | |
1089 | ||
1090 | /* NOTE: writes return length to buf->start */ | |
1091 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1092 | ret = -EFAULT; | |
1093 | else | |
969e57ad | 1094 | ret = mtdchar_readoob(file, mtd, buf.start, |
97718540 KC |
1095 | buf.length, compat_ptr(buf.ptr), |
1096 | &buf_user->start); | |
1097 | break; | |
1098 | } | |
1099 | default: | |
969e57ad | 1100 | ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); |
97718540 KC |
1101 | } |
1102 | ||
5aa82940 | 1103 | mutex_unlock(&mtd_mutex); |
97718540 KC |
1104 | |
1105 | return ret; | |
1106 | } | |
1107 | ||
1108 | #endif /* CONFIG_COMPAT */ | |
1109 | ||
402d3265 DH |
1110 | /* |
1111 | * try to determine where a shared mapping can be made | |
1112 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
1113 | * mappings) | |
1114 | */ | |
1115 | #ifndef CONFIG_MMU | |
969e57ad | 1116 | static unsigned long mtdchar_get_unmapped_area(struct file *file, |
402d3265 DH |
1117 | unsigned long addr, |
1118 | unsigned long len, | |
1119 | unsigned long pgoff, | |
1120 | unsigned long flags) | |
1121 | { | |
1122 | struct mtd_file_info *mfi = file->private_data; | |
1123 | struct mtd_info *mtd = mfi->mtd; | |
1124 | ||
1125 | if (mtd->get_unmapped_area) { | |
1126 | unsigned long offset; | |
1127 | ||
1128 | if (addr != 0) | |
1129 | return (unsigned long) -EINVAL; | |
1130 | ||
1131 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) | |
1132 | return (unsigned long) -EINVAL; | |
1133 | ||
1134 | offset = pgoff << PAGE_SHIFT; | |
1135 | if (offset > mtd->size - len) | |
1136 | return (unsigned long) -EINVAL; | |
1137 | ||
04c601bf | 1138 | return mtd_get_unmapped_area(mtd, len, offset, flags); |
402d3265 DH |
1139 | } |
1140 | ||
1141 | /* can't map directly */ | |
1142 | return (unsigned long) -ENOSYS; | |
1143 | } | |
1144 | #endif | |
1145 | ||
1146 | /* | |
1147 | * set up a mapping for shared memory segments | |
1148 | */ | |
969e57ad | 1149 | static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) |
402d3265 DH |
1150 | { |
1151 | #ifdef CONFIG_MMU | |
1152 | struct mtd_file_info *mfi = file->private_data; | |
1153 | struct mtd_info *mtd = mfi->mtd; | |
dd02b67d AG |
1154 | struct map_info *map = mtd->priv; |
1155 | unsigned long start; | |
1156 | unsigned long off; | |
1157 | u32 len; | |
1158 | ||
1159 | if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) { | |
1160 | off = vma->vm_pgoff << PAGE_SHIFT; | |
1161 | start = map->phys; | |
1162 | len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size); | |
1163 | start &= PAGE_MASK; | |
1164 | if ((vma->vm_end - vma->vm_start + off) > len) | |
1165 | return -EINVAL; | |
1166 | ||
1167 | off += start; | |
1168 | vma->vm_pgoff = off >> PAGE_SHIFT; | |
1169 | vma->vm_flags |= VM_IO | VM_RESERVED; | |
1170 | ||
1171 | #ifdef pgprot_noncached | |
1172 | if (file->f_flags & O_DSYNC || off >= __pa(high_memory)) | |
1173 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1174 | #endif | |
1175 | if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, | |
1176 | vma->vm_end - vma->vm_start, | |
1177 | vma->vm_page_prot)) | |
1178 | return -EAGAIN; | |
402d3265 | 1179 | |
402d3265 | 1180 | return 0; |
dd02b67d | 1181 | } |
402d3265 DH |
1182 | return -ENOSYS; |
1183 | #else | |
1184 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; | |
1185 | #endif | |
1186 | } | |
1187 | ||
d54b1fdb | 1188 | static const struct file_operations mtd_fops = { |
1da177e4 | 1189 | .owner = THIS_MODULE, |
969e57ad AB |
1190 | .llseek = mtdchar_lseek, |
1191 | .read = mtdchar_read, | |
1192 | .write = mtdchar_write, | |
1193 | .unlocked_ioctl = mtdchar_unlocked_ioctl, | |
97718540 | 1194 | #ifdef CONFIG_COMPAT |
969e57ad | 1195 | .compat_ioctl = mtdchar_compat_ioctl, |
97718540 | 1196 | #endif |
969e57ad AB |
1197 | .open = mtdchar_open, |
1198 | .release = mtdchar_close, | |
1199 | .mmap = mtdchar_mmap, | |
402d3265 | 1200 | #ifndef CONFIG_MMU |
969e57ad | 1201 | .get_unmapped_area = mtdchar_get_unmapped_area, |
402d3265 | 1202 | #endif |
1da177e4 LT |
1203 | }; |
1204 | ||
51139ada AV |
1205 | static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, |
1206 | int flags, const char *dev_name, void *data) | |
cd874237 | 1207 | { |
c74a1cbb | 1208 | return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC); |
cd874237 KS |
1209 | } |
1210 | ||
1211 | static struct file_system_type mtd_inodefs_type = { | |
1212 | .name = "mtd_inodefs", | |
51139ada | 1213 | .mount = mtd_inodefs_mount, |
cd874237 KS |
1214 | .kill_sb = kill_anon_super, |
1215 | }; | |
1216 | ||
1217 | static void mtdchar_notify_add(struct mtd_info *mtd) | |
1218 | { | |
1219 | } | |
1220 | ||
1221 | static void mtdchar_notify_remove(struct mtd_info *mtd) | |
1222 | { | |
1223 | struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index); | |
1224 | ||
1225 | if (mtd_ino) { | |
1226 | /* Destroy the inode if it exists */ | |
6d6b77f1 | 1227 | clear_nlink(mtd_ino); |
cd874237 KS |
1228 | iput(mtd_ino); |
1229 | } | |
1230 | } | |
1231 | ||
1232 | static struct mtd_notifier mtdchar_notifier = { | |
1233 | .add = mtdchar_notify_add, | |
1234 | .remove = mtdchar_notify_remove, | |
1235 | }; | |
1236 | ||
1da177e4 LT |
1237 | static int __init init_mtdchar(void) |
1238 | { | |
cd874237 | 1239 | int ret; |
1f24b5a8 | 1240 | |
cd874237 | 1241 | ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
dad0db31 | 1242 | "mtd", &mtd_fops); |
cd874237 KS |
1243 | if (ret < 0) { |
1244 | pr_notice("Can't allocate major number %d for " | |
1245 | "Memory Technology Devices.\n", MTD_CHAR_MAJOR); | |
1246 | return ret; | |
9bc7b387 TP |
1247 | } |
1248 | ||
cd874237 KS |
1249 | ret = register_filesystem(&mtd_inodefs_type); |
1250 | if (ret) { | |
1251 | pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret); | |
1252 | goto err_unregister_chdev; | |
1253 | } | |
1254 | ||
1255 | mtd_inode_mnt = kern_mount(&mtd_inodefs_type); | |
1256 | if (IS_ERR(mtd_inode_mnt)) { | |
1257 | ret = PTR_ERR(mtd_inode_mnt); | |
1258 | pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret); | |
1259 | goto err_unregister_filesystem; | |
1260 | } | |
1261 | register_mtd_user(&mtdchar_notifier); | |
1262 | ||
1263 | return ret; | |
1264 | ||
1265 | err_unregister_filesystem: | |
1266 | unregister_filesystem(&mtd_inodefs_type); | |
1267 | err_unregister_chdev: | |
1268 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); | |
1269 | return ret; | |
1da177e4 LT |
1270 | } |
1271 | ||
1272 | static void __exit cleanup_mtdchar(void) | |
1273 | { | |
cd874237 | 1274 | unregister_mtd_user(&mtdchar_notifier); |
423e0ab0 | 1275 | kern_unmount(mtd_inode_mnt); |
cd874237 | 1276 | unregister_filesystem(&mtd_inodefs_type); |
dad0db31 | 1277 | __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | module_init(init_mtdchar); | |
1281 | module_exit(cleanup_mtdchar); | |
1282 | ||
1f24b5a8 | 1283 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |
1da177e4 LT |
1284 | |
1285 | MODULE_LICENSE("GPL"); | |
1286 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1287 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); | |
90160e13 | 1288 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |