Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Character-device access to raw MTD devices. |
3 | * | |
4 | */ | |
5 | ||
15fdc52f TG |
6 | #include <linux/device.h> |
7 | #include <linux/fs.h> | |
0c1eafdb | 8 | #include <linux/mm.h> |
9c74034f | 9 | #include <linux/err.h> |
15fdc52f | 10 | #include <linux/init.h> |
1da177e4 LT |
11 | #include <linux/kernel.h> |
12 | #include <linux/module.h> | |
15fdc52f TG |
13 | #include <linux/slab.h> |
14 | #include <linux/sched.h> | |
6071239e | 15 | #include <linux/smp_lock.h> |
402d3265 | 16 | #include <linux/backing-dev.h> |
97718540 | 17 | #include <linux/compat.h> |
15fdc52f | 18 | |
1da177e4 LT |
19 | #include <linux/mtd/mtd.h> |
20 | #include <linux/mtd/compatmac.h> | |
1da177e4 | 21 | |
15fdc52f | 22 | #include <asm/uaccess.h> |
9bc7b387 | 23 | |
1da177e4 | 24 | |
045e9a5d | 25 | /* |
f1a28c02 TG |
26 | * Data structure to hold the pointer to the mtd device as well |
27 | * as mode information ofr various use cases. | |
045e9a5d | 28 | */ |
f1a28c02 TG |
29 | struct mtd_file_info { |
30 | struct mtd_info *mtd; | |
31 | enum mtd_file_modes mode; | |
32 | }; | |
31f4233b | 33 | |
1da177e4 LT |
34 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
35 | { | |
f1a28c02 TG |
36 | struct mtd_file_info *mfi = file->private_data; |
37 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
38 | |
39 | switch (orig) { | |
ea59830d | 40 | case SEEK_SET: |
1da177e4 | 41 | break; |
ea59830d | 42 | case SEEK_CUR: |
8b491d75 | 43 | offset += file->f_pos; |
1da177e4 | 44 | break; |
ea59830d | 45 | case SEEK_END: |
8b491d75 | 46 | offset += mtd->size; |
1da177e4 LT |
47 | break; |
48 | default: | |
49 | return -EINVAL; | |
50 | } | |
51 | ||
1887f517 | 52 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 53 | return file->f_pos = offset; |
1da177e4 | 54 | |
8b491d75 | 55 | return -EINVAL; |
1da177e4 LT |
56 | } |
57 | ||
58 | ||
59 | ||
60 | static int mtd_open(struct inode *inode, struct file *file) | |
61 | { | |
62 | int minor = iminor(inode); | |
63 | int devnum = minor >> 1; | |
6071239e | 64 | int ret = 0; |
1da177e4 | 65 | struct mtd_info *mtd; |
f1a28c02 | 66 | struct mtd_file_info *mfi; |
1da177e4 LT |
67 | |
68 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
69 | ||
70 | if (devnum >= MAX_MTD_DEVICES) | |
71 | return -ENODEV; | |
72 | ||
73 | /* You can't open the RO devices RW */ | |
aeb5d727 | 74 | if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
1da177e4 LT |
75 | return -EACCES; |
76 | ||
6071239e | 77 | lock_kernel(); |
1da177e4 | 78 | mtd = get_mtd_device(NULL, devnum); |
97894cda | 79 | |
6071239e JC |
80 | if (IS_ERR(mtd)) { |
81 | ret = PTR_ERR(mtd); | |
82 | goto out; | |
83 | } | |
97894cda | 84 | |
402d3265 | 85 | if (mtd->type == MTD_ABSENT) { |
1da177e4 | 86 | put_mtd_device(mtd); |
6071239e JC |
87 | ret = -ENODEV; |
88 | goto out; | |
1da177e4 LT |
89 | } |
90 | ||
402d3265 DH |
91 | if (mtd->backing_dev_info) |
92 | file->f_mapping->backing_dev_info = mtd->backing_dev_info; | |
93 | ||
1da177e4 | 94 | /* You can't open it RW if it's not a writeable device */ |
aeb5d727 | 95 | if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
1da177e4 | 96 | put_mtd_device(mtd); |
6071239e JC |
97 | ret = -EACCES; |
98 | goto out; | |
1da177e4 | 99 | } |
97894cda | 100 | |
f1a28c02 TG |
101 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
102 | if (!mfi) { | |
103 | put_mtd_device(mtd); | |
6071239e JC |
104 | ret = -ENOMEM; |
105 | goto out; | |
f1a28c02 TG |
106 | } |
107 | mfi->mtd = mtd; | |
108 | file->private_data = mfi; | |
109 | ||
6071239e JC |
110 | out: |
111 | unlock_kernel(); | |
112 | return ret; | |
1da177e4 LT |
113 | } /* mtd_open */ |
114 | ||
115 | /*====================================================================*/ | |
116 | ||
117 | static int mtd_close(struct inode *inode, struct file *file) | |
118 | { | |
f1a28c02 TG |
119 | struct mtd_file_info *mfi = file->private_data; |
120 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
121 | |
122 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
123 | ||
7eafaed5 | 124 | /* Only sync if opened RW */ |
aeb5d727 | 125 | if ((file->f_mode & FMODE_WRITE) && mtd->sync) |
1da177e4 | 126 | mtd->sync(mtd); |
97894cda | 127 | |
1da177e4 | 128 | put_mtd_device(mtd); |
f1a28c02 TG |
129 | file->private_data = NULL; |
130 | kfree(mfi); | |
1da177e4 LT |
131 | |
132 | return 0; | |
133 | } /* mtd_close */ | |
134 | ||
135 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
136 | userspace buffer down and use it directly with readv/writev. | |
137 | */ | |
138 | #define MAX_KMALLOC_SIZE 0x20000 | |
139 | ||
140 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
141 | { | |
f1a28c02 TG |
142 | struct mtd_file_info *mfi = file->private_data; |
143 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
144 | size_t retlen=0; |
145 | size_t total_retlen=0; | |
146 | int ret=0; | |
147 | int len; | |
148 | char *kbuf; | |
97894cda | 149 | |
1da177e4 LT |
150 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
151 | ||
152 | if (*ppos + count > mtd->size) | |
153 | count = mtd->size - *ppos; | |
154 | ||
155 | if (!count) | |
156 | return 0; | |
97894cda | 157 | |
1da177e4 LT |
158 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers |
159 | and pass them directly to the MTD functions */ | |
b802c074 TG |
160 | |
161 | if (count > MAX_KMALLOC_SIZE) | |
162 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
163 | else | |
164 | kbuf=kmalloc(count, GFP_KERNEL); | |
165 | ||
166 | if (!kbuf) | |
167 | return -ENOMEM; | |
168 | ||
1da177e4 | 169 | while (count) { |
b802c074 | 170 | |
97894cda | 171 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
172 | len = MAX_KMALLOC_SIZE; |
173 | else | |
174 | len = count; | |
175 | ||
f1a28c02 TG |
176 | switch (mfi->mode) { |
177 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
178 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
179 | break; | |
180 | case MTD_MODE_OTP_USER: | |
181 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
182 | break; | |
f1a28c02 TG |
183 | case MTD_MODE_RAW: |
184 | { | |
185 | struct mtd_oob_ops ops; | |
186 | ||
187 | ops.mode = MTD_OOB_RAW; | |
188 | ops.datbuf = kbuf; | |
189 | ops.oobbuf = NULL; | |
190 | ops.len = len; | |
191 | ||
192 | ret = mtd->read_oob(mtd, *ppos, &ops); | |
193 | retlen = ops.retlen; | |
194 | break; | |
195 | } | |
31f4233b | 196 | default: |
f4a43cfc | 197 | ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 198 | } |
1da177e4 LT |
199 | /* Nand returns -EBADMSG on ecc errors, but it returns |
200 | * the data. For our userspace tools it is important | |
97894cda | 201 | * to dump areas with ecc errors ! |
9a1fcdfd TG |
202 | * For kernel internal usage it also might return -EUCLEAN |
203 | * to signal the caller that a bitflip has occured and has | |
204 | * been corrected by the ECC algorithm. | |
1da177e4 LT |
205 | * Userspace software which accesses NAND this way |
206 | * must be aware of the fact that it deals with NAND | |
207 | */ | |
9a1fcdfd | 208 | if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { |
1da177e4 LT |
209 | *ppos += retlen; |
210 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 211 | kfree(kbuf); |
1da177e4 LT |
212 | return -EFAULT; |
213 | } | |
214 | else | |
215 | total_retlen += retlen; | |
216 | ||
217 | count -= retlen; | |
218 | buf += retlen; | |
31f4233b NP |
219 | if (retlen == 0) |
220 | count = 0; | |
1da177e4 LT |
221 | } |
222 | else { | |
223 | kfree(kbuf); | |
224 | return ret; | |
225 | } | |
97894cda | 226 | |
1da177e4 LT |
227 | } |
228 | ||
b802c074 | 229 | kfree(kbuf); |
1da177e4 LT |
230 | return total_retlen; |
231 | } /* mtd_read */ | |
232 | ||
233 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
234 | { | |
f1a28c02 TG |
235 | struct mtd_file_info *mfi = file->private_data; |
236 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
237 | char *kbuf; |
238 | size_t retlen; | |
239 | size_t total_retlen=0; | |
240 | int ret=0; | |
241 | int len; | |
242 | ||
243 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 244 | |
1da177e4 LT |
245 | if (*ppos == mtd->size) |
246 | return -ENOSPC; | |
97894cda | 247 | |
1da177e4 LT |
248 | if (*ppos + count > mtd->size) |
249 | count = mtd->size - *ppos; | |
250 | ||
251 | if (!count) | |
252 | return 0; | |
253 | ||
b802c074 TG |
254 | if (count > MAX_KMALLOC_SIZE) |
255 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
256 | else | |
257 | kbuf=kmalloc(count, GFP_KERNEL); | |
258 | ||
259 | if (!kbuf) | |
260 | return -ENOMEM; | |
261 | ||
1da177e4 | 262 | while (count) { |
b802c074 | 263 | |
97894cda | 264 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
265 | len = MAX_KMALLOC_SIZE; |
266 | else | |
267 | len = count; | |
268 | ||
1da177e4 LT |
269 | if (copy_from_user(kbuf, buf, len)) { |
270 | kfree(kbuf); | |
271 | return -EFAULT; | |
272 | } | |
97894cda | 273 | |
f1a28c02 TG |
274 | switch (mfi->mode) { |
275 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
276 | ret = -EROFS; |
277 | break; | |
278 | case MTD_MODE_OTP_USER: | |
279 | if (!mtd->write_user_prot_reg) { | |
280 | ret = -EOPNOTSUPP; | |
281 | break; | |
282 | } | |
283 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
284 | break; | |
f1a28c02 TG |
285 | |
286 | case MTD_MODE_RAW: | |
287 | { | |
288 | struct mtd_oob_ops ops; | |
289 | ||
290 | ops.mode = MTD_OOB_RAW; | |
291 | ops.datbuf = kbuf; | |
292 | ops.oobbuf = NULL; | |
293 | ops.len = len; | |
294 | ||
295 | ret = mtd->write_oob(mtd, *ppos, &ops); | |
296 | retlen = ops.retlen; | |
297 | break; | |
298 | } | |
299 | ||
31f4233b NP |
300 | default: |
301 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
302 | } | |
1da177e4 LT |
303 | if (!ret) { |
304 | *ppos += retlen; | |
305 | total_retlen += retlen; | |
306 | count -= retlen; | |
307 | buf += retlen; | |
308 | } | |
309 | else { | |
310 | kfree(kbuf); | |
311 | return ret; | |
312 | } | |
1da177e4 LT |
313 | } |
314 | ||
b802c074 | 315 | kfree(kbuf); |
1da177e4 LT |
316 | return total_retlen; |
317 | } /* mtd_write */ | |
318 | ||
319 | /*====================================================================== | |
320 | ||
321 | IOCTL calls for getting device parameters. | |
322 | ||
323 | ======================================================================*/ | |
324 | static void mtdchar_erase_callback (struct erase_info *instr) | |
325 | { | |
326 | wake_up((wait_queue_head_t *)instr->priv); | |
327 | } | |
328 | ||
34a82443 | 329 | #ifdef CONFIG_HAVE_MTD_OTP |
f1a28c02 TG |
330 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
331 | { | |
332 | struct mtd_info *mtd = mfi->mtd; | |
333 | int ret = 0; | |
334 | ||
335 | switch (mode) { | |
336 | case MTD_OTP_FACTORY: | |
337 | if (!mtd->read_fact_prot_reg) | |
338 | ret = -EOPNOTSUPP; | |
339 | else | |
340 | mfi->mode = MTD_MODE_OTP_FACTORY; | |
341 | break; | |
342 | case MTD_OTP_USER: | |
343 | if (!mtd->read_fact_prot_reg) | |
344 | ret = -EOPNOTSUPP; | |
345 | else | |
346 | mfi->mode = MTD_MODE_OTP_USER; | |
347 | break; | |
348 | default: | |
349 | ret = -EINVAL; | |
350 | case MTD_OTP_OFF: | |
351 | break; | |
352 | } | |
353 | return ret; | |
354 | } | |
355 | #else | |
356 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
357 | #endif | |
358 | ||
97718540 KC |
359 | static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd, |
360 | uint64_t start, uint32_t length, void __user *ptr, | |
361 | uint32_t __user *retp) | |
362 | { | |
363 | struct mtd_oob_ops ops; | |
364 | uint32_t retlen; | |
365 | int ret = 0; | |
366 | ||
367 | if (!(file->f_mode & FMODE_WRITE)) | |
368 | return -EPERM; | |
369 | ||
370 | if (length > 4096) | |
371 | return -EINVAL; | |
372 | ||
373 | if (!mtd->write_oob) | |
374 | ret = -EOPNOTSUPP; | |
375 | else | |
376 | ret = access_ok(VERIFY_READ, ptr, length) ? 0 : EFAULT; | |
377 | ||
378 | if (ret) | |
379 | return ret; | |
380 | ||
381 | ops.ooblen = length; | |
382 | ops.ooboffs = start & (mtd->oobsize - 1); | |
383 | ops.datbuf = NULL; | |
384 | ops.mode = MTD_OOB_PLACE; | |
385 | ||
386 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
387 | return -EINVAL; | |
388 | ||
389 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
390 | if (!ops.oobbuf) | |
391 | return -ENOMEM; | |
392 | ||
393 | if (copy_from_user(ops.oobbuf, ptr, length)) { | |
394 | kfree(ops.oobbuf); | |
395 | return -EFAULT; | |
396 | } | |
397 | ||
398 | start &= ~((uint64_t)mtd->oobsize - 1); | |
399 | ret = mtd->write_oob(mtd, start, &ops); | |
400 | ||
401 | if (ops.oobretlen > 0xFFFFFFFFU) | |
402 | ret = -EOVERFLOW; | |
403 | retlen = ops.oobretlen; | |
404 | if (copy_to_user(retp, &retlen, sizeof(length))) | |
405 | ret = -EFAULT; | |
406 | ||
407 | kfree(ops.oobbuf); | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start, | |
412 | uint32_t length, void __user *ptr, uint32_t __user *retp) | |
413 | { | |
414 | struct mtd_oob_ops ops; | |
415 | int ret = 0; | |
416 | ||
417 | if (length > 4096) | |
418 | return -EINVAL; | |
419 | ||
420 | if (!mtd->read_oob) | |
421 | ret = -EOPNOTSUPP; | |
422 | else | |
423 | ret = access_ok(VERIFY_WRITE, ptr, | |
424 | length) ? 0 : -EFAULT; | |
425 | if (ret) | |
426 | return ret; | |
427 | ||
428 | ops.ooblen = length; | |
429 | ops.ooboffs = start & (mtd->oobsize - 1); | |
430 | ops.datbuf = NULL; | |
431 | ops.mode = MTD_OOB_PLACE; | |
432 | ||
433 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) | |
434 | return -EINVAL; | |
435 | ||
436 | ops.oobbuf = kmalloc(length, GFP_KERNEL); | |
437 | if (!ops.oobbuf) | |
438 | return -ENOMEM; | |
439 | ||
440 | start &= ~((uint64_t)mtd->oobsize - 1); | |
441 | ret = mtd->read_oob(mtd, start, &ops); | |
442 | ||
443 | if (put_user(ops.oobretlen, retp)) | |
444 | ret = -EFAULT; | |
445 | else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, | |
446 | ops.oobretlen)) | |
447 | ret = -EFAULT; | |
448 | ||
449 | kfree(ops.oobbuf); | |
450 | return ret; | |
451 | } | |
452 | ||
1da177e4 LT |
453 | static int mtd_ioctl(struct inode *inode, struct file *file, |
454 | u_int cmd, u_long arg) | |
455 | { | |
f1a28c02 TG |
456 | struct mtd_file_info *mfi = file->private_data; |
457 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
458 | void __user *argp = (void __user *)arg; |
459 | int ret = 0; | |
460 | u_long size; | |
73c619ea | 461 | struct mtd_info_user info; |
97894cda | 462 | |
1da177e4 LT |
463 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
464 | ||
465 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
466 | if (cmd & IOC_IN) { | |
467 | if (!access_ok(VERIFY_READ, argp, size)) | |
468 | return -EFAULT; | |
469 | } | |
470 | if (cmd & IOC_OUT) { | |
471 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
472 | return -EFAULT; | |
473 | } | |
97894cda | 474 | |
1da177e4 LT |
475 | switch (cmd) { |
476 | case MEMGETREGIONCOUNT: | |
477 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
478 | return -EFAULT; | |
479 | break; | |
480 | ||
481 | case MEMGETREGIONINFO: | |
482 | { | |
b67c5f87 ZW |
483 | uint32_t ur_idx; |
484 | struct mtd_erase_region_info *kr; | |
485 | struct region_info_user *ur = (struct region_info_user *) argp; | |
1da177e4 | 486 | |
b67c5f87 | 487 | if (get_user(ur_idx, &(ur->regionindex))) |
1da177e4 LT |
488 | return -EFAULT; |
489 | ||
b67c5f87 ZW |
490 | kr = &(mtd->eraseregions[ur_idx]); |
491 | ||
492 | if (put_user(kr->offset, &(ur->offset)) | |
493 | || put_user(kr->erasesize, &(ur->erasesize)) | |
494 | || put_user(kr->numblocks, &(ur->numblocks))) | |
1da177e4 | 495 | return -EFAULT; |
b67c5f87 | 496 | |
1da177e4 LT |
497 | break; |
498 | } | |
499 | ||
500 | case MEMGETINFO: | |
73c619ea JE |
501 | info.type = mtd->type; |
502 | info.flags = mtd->flags; | |
503 | info.size = mtd->size; | |
504 | info.erasesize = mtd->erasesize; | |
505 | info.writesize = mtd->writesize; | |
506 | info.oobsize = mtd->oobsize; | |
64f60710 AB |
507 | /* The below fields are obsolete */ |
508 | info.ecctype = -1; | |
509 | info.eccsize = 0; | |
73c619ea | 510 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
511 | return -EFAULT; |
512 | break; | |
513 | ||
514 | case MEMERASE: | |
0dc54e9f | 515 | case MEMERASE64: |
1da177e4 LT |
516 | { |
517 | struct erase_info *erase; | |
518 | ||
aeb5d727 | 519 | if(!(file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
520 | return -EPERM; |
521 | ||
95b93a0c | 522 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
523 | if (!erase) |
524 | ret = -ENOMEM; | |
525 | else { | |
526 | wait_queue_head_t waitq; | |
527 | DECLARE_WAITQUEUE(wait, current); | |
528 | ||
529 | init_waitqueue_head(&waitq); | |
530 | ||
0dc54e9f KC |
531 | if (cmd == MEMERASE64) { |
532 | struct erase_info_user64 einfo64; | |
533 | ||
534 | if (copy_from_user(&einfo64, argp, | |
535 | sizeof(struct erase_info_user64))) { | |
536 | kfree(erase); | |
537 | return -EFAULT; | |
538 | } | |
539 | erase->addr = einfo64.start; | |
540 | erase->len = einfo64.length; | |
541 | } else { | |
542 | struct erase_info_user einfo32; | |
543 | ||
544 | if (copy_from_user(&einfo32, argp, | |
545 | sizeof(struct erase_info_user))) { | |
546 | kfree(erase); | |
547 | return -EFAULT; | |
548 | } | |
549 | erase->addr = einfo32.start; | |
550 | erase->len = einfo32.length; | |
1da177e4 LT |
551 | } |
552 | erase->mtd = mtd; | |
553 | erase->callback = mtdchar_erase_callback; | |
554 | erase->priv = (unsigned long)&waitq; | |
97894cda | 555 | |
1da177e4 LT |
556 | /* |
557 | FIXME: Allow INTERRUPTIBLE. Which means | |
558 | not having the wait_queue head on the stack. | |
97894cda | 559 | |
1da177e4 LT |
560 | If the wq_head is on the stack, and we |
561 | leave because we got interrupted, then the | |
562 | wq_head is no longer there when the | |
563 | callback routine tries to wake us up. | |
564 | */ | |
565 | ret = mtd->erase(mtd, erase); | |
566 | if (!ret) { | |
567 | set_current_state(TASK_UNINTERRUPTIBLE); | |
568 | add_wait_queue(&waitq, &wait); | |
569 | if (erase->state != MTD_ERASE_DONE && | |
570 | erase->state != MTD_ERASE_FAILED) | |
571 | schedule(); | |
572 | remove_wait_queue(&waitq, &wait); | |
573 | set_current_state(TASK_RUNNING); | |
574 | ||
575 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
576 | } | |
577 | kfree(erase); | |
578 | } | |
579 | break; | |
580 | } | |
581 | ||
582 | case MEMWRITEOOB: | |
583 | { | |
584 | struct mtd_oob_buf buf; | |
97718540 | 585 | struct mtd_oob_buf __user *buf_user = argp; |
1da177e4 | 586 | |
97718540 KC |
587 | /* NOTE: writes return length to buf_user->length */ |
588 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 589 | ret = -EFAULT; |
97718540 KC |
590 | else |
591 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
592 | buf.ptr, &buf_user->length); | |
1da177e4 | 593 | break; |
1da177e4 LT |
594 | } |
595 | ||
596 | case MEMREADOOB: | |
597 | { | |
598 | struct mtd_oob_buf buf; | |
97718540 | 599 | struct mtd_oob_buf __user *buf_user = argp; |
8593fbc6 | 600 | |
97718540 KC |
601 | /* NOTE: writes return length to buf_user->start */ |
602 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
1da177e4 | 603 | ret = -EFAULT; |
97718540 KC |
604 | else |
605 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
606 | buf.ptr, &buf_user->start); | |
1da177e4 LT |
607 | break; |
608 | } | |
609 | ||
aea7cea9 KC |
610 | case MEMWRITEOOB64: |
611 | { | |
612 | struct mtd_oob_buf64 buf; | |
613 | struct mtd_oob_buf64 __user *buf_user = argp; | |
614 | ||
615 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
616 | ret = -EFAULT; | |
617 | else | |
618 | ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, | |
619 | (void __user *)(uintptr_t)buf.usr_ptr, | |
620 | &buf_user->length); | |
621 | break; | |
622 | } | |
623 | ||
624 | case MEMREADOOB64: | |
625 | { | |
626 | struct mtd_oob_buf64 buf; | |
627 | struct mtd_oob_buf64 __user *buf_user = argp; | |
628 | ||
629 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
630 | ret = -EFAULT; | |
631 | else | |
632 | ret = mtd_do_readoob(mtd, buf.start, buf.length, | |
633 | (void __user *)(uintptr_t)buf.usr_ptr, | |
634 | &buf_user->length); | |
635 | break; | |
636 | } | |
637 | ||
1da177e4 LT |
638 | case MEMLOCK: |
639 | { | |
175428b2 | 640 | struct erase_info_user einfo; |
1da177e4 | 641 | |
175428b2 | 642 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
643 | return -EFAULT; |
644 | ||
645 | if (!mtd->lock) | |
646 | ret = -EOPNOTSUPP; | |
647 | else | |
175428b2 | 648 | ret = mtd->lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
649 | break; |
650 | } | |
651 | ||
652 | case MEMUNLOCK: | |
653 | { | |
175428b2 | 654 | struct erase_info_user einfo; |
1da177e4 | 655 | |
175428b2 | 656 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
657 | return -EFAULT; |
658 | ||
659 | if (!mtd->unlock) | |
660 | ret = -EOPNOTSUPP; | |
661 | else | |
175428b2 | 662 | ret = mtd->unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
663 | break; |
664 | } | |
665 | ||
5bd34c09 | 666 | /* Legacy interface */ |
1da177e4 LT |
667 | case MEMGETOOBSEL: |
668 | { | |
5bd34c09 TG |
669 | struct nand_oobinfo oi; |
670 | ||
671 | if (!mtd->ecclayout) | |
672 | return -EOPNOTSUPP; | |
673 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
674 | return -EINVAL; | |
675 | ||
676 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
677 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
678 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
679 | sizeof(oi.oobfree)); | |
d25ade71 | 680 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
681 | |
682 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
683 | return -EFAULT; |
684 | break; | |
685 | } | |
686 | ||
687 | case MEMGETBADBLOCK: | |
688 | { | |
689 | loff_t offs; | |
97894cda | 690 | |
1da177e4 LT |
691 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
692 | return -EFAULT; | |
693 | if (!mtd->block_isbad) | |
694 | ret = -EOPNOTSUPP; | |
695 | else | |
696 | return mtd->block_isbad(mtd, offs); | |
697 | break; | |
698 | } | |
699 | ||
700 | case MEMSETBADBLOCK: | |
701 | { | |
702 | loff_t offs; | |
703 | ||
704 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
705 | return -EFAULT; | |
706 | if (!mtd->block_markbad) | |
707 | ret = -EOPNOTSUPP; | |
708 | else | |
709 | return mtd->block_markbad(mtd, offs); | |
710 | break; | |
711 | } | |
712 | ||
34a82443 | 713 | #ifdef CONFIG_HAVE_MTD_OTP |
31f4233b NP |
714 | case OTPSELECT: |
715 | { | |
716 | int mode; | |
717 | if (copy_from_user(&mode, argp, sizeof(int))) | |
718 | return -EFAULT; | |
f1a28c02 TG |
719 | |
720 | mfi->mode = MTD_MODE_NORMAL; | |
721 | ||
722 | ret = otp_select_filemode(mfi, mode); | |
723 | ||
81dba488 | 724 | file->f_pos = 0; |
31f4233b NP |
725 | break; |
726 | } | |
727 | ||
728 | case OTPGETREGIONCOUNT: | |
729 | case OTPGETREGIONINFO: | |
730 | { | |
731 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
732 | if (!buf) | |
733 | return -ENOMEM; | |
734 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
735 | switch (mfi->mode) { |
736 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
737 | if (mtd->get_fact_prot_info) |
738 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
739 | break; | |
740 | case MTD_MODE_OTP_USER: | |
741 | if (mtd->get_user_prot_info) | |
742 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
743 | break; | |
f1a28c02 TG |
744 | default: |
745 | break; | |
31f4233b NP |
746 | } |
747 | if (ret >= 0) { | |
748 | if (cmd == OTPGETREGIONCOUNT) { | |
749 | int nbr = ret / sizeof(struct otp_info); | |
750 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
751 | } else | |
752 | ret = copy_to_user(argp, buf, ret); | |
753 | if (ret) | |
754 | ret = -EFAULT; | |
755 | } | |
756 | kfree(buf); | |
757 | break; | |
758 | } | |
759 | ||
760 | case OTPLOCK: | |
761 | { | |
175428b2 | 762 | struct otp_info oinfo; |
31f4233b | 763 | |
f1a28c02 | 764 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b | 765 | return -EINVAL; |
175428b2 | 766 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b NP |
767 | return -EFAULT; |
768 | if (!mtd->lock_user_prot_reg) | |
769 | return -EOPNOTSUPP; | |
175428b2 | 770 | ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
771 | break; |
772 | } | |
773 | #endif | |
774 | ||
f1a28c02 TG |
775 | case ECCGETLAYOUT: |
776 | { | |
777 | if (!mtd->ecclayout) | |
778 | return -EOPNOTSUPP; | |
779 | ||
d25ade71 | 780 | if (copy_to_user(argp, mtd->ecclayout, |
f1a28c02 TG |
781 | sizeof(struct nand_ecclayout))) |
782 | return -EFAULT; | |
783 | break; | |
784 | } | |
785 | ||
786 | case ECCGETSTATS: | |
787 | { | |
788 | if (copy_to_user(argp, &mtd->ecc_stats, | |
789 | sizeof(struct mtd_ecc_stats))) | |
790 | return -EFAULT; | |
791 | break; | |
792 | } | |
793 | ||
794 | case MTDFILEMODE: | |
795 | { | |
796 | mfi->mode = 0; | |
797 | ||
798 | switch(arg) { | |
799 | case MTD_MODE_OTP_FACTORY: | |
800 | case MTD_MODE_OTP_USER: | |
801 | ret = otp_select_filemode(mfi, arg); | |
802 | break; | |
803 | ||
804 | case MTD_MODE_RAW: | |
805 | if (!mtd->read_oob || !mtd->write_oob) | |
806 | return -EOPNOTSUPP; | |
807 | mfi->mode = arg; | |
808 | ||
809 | case MTD_MODE_NORMAL: | |
810 | break; | |
811 | default: | |
812 | ret = -EINVAL; | |
813 | } | |
814 | file->f_pos = 0; | |
815 | break; | |
816 | } | |
817 | ||
1da177e4 LT |
818 | default: |
819 | ret = -ENOTTY; | |
820 | } | |
821 | ||
822 | return ret; | |
823 | } /* memory_ioctl */ | |
824 | ||
97718540 KC |
825 | #ifdef CONFIG_COMPAT |
826 | ||
827 | struct mtd_oob_buf32 { | |
828 | u_int32_t start; | |
829 | u_int32_t length; | |
830 | compat_caddr_t ptr; /* unsigned char* */ | |
831 | }; | |
832 | ||
833 | #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) | |
834 | #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) | |
835 | ||
836 | static long mtd_compat_ioctl(struct file *file, unsigned int cmd, | |
837 | unsigned long arg) | |
838 | { | |
668ff9ab | 839 | struct inode *inode = file->f_path.dentry->d_inode; |
97718540 KC |
840 | struct mtd_file_info *mfi = file->private_data; |
841 | struct mtd_info *mtd = mfi->mtd; | |
0b6585ce | 842 | void __user *argp = compat_ptr(arg); |
97718540 KC |
843 | int ret = 0; |
844 | ||
845 | lock_kernel(); | |
846 | ||
847 | switch (cmd) { | |
848 | case MEMWRITEOOB32: | |
849 | { | |
850 | struct mtd_oob_buf32 buf; | |
851 | struct mtd_oob_buf32 __user *buf_user = argp; | |
852 | ||
853 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
854 | ret = -EFAULT; | |
855 | else | |
856 | ret = mtd_do_writeoob(file, mtd, buf.start, | |
857 | buf.length, compat_ptr(buf.ptr), | |
858 | &buf_user->length); | |
859 | break; | |
860 | } | |
861 | ||
862 | case MEMREADOOB32: | |
863 | { | |
864 | struct mtd_oob_buf32 buf; | |
865 | struct mtd_oob_buf32 __user *buf_user = argp; | |
866 | ||
867 | /* NOTE: writes return length to buf->start */ | |
868 | if (copy_from_user(&buf, argp, sizeof(buf))) | |
869 | ret = -EFAULT; | |
870 | else | |
871 | ret = mtd_do_readoob(mtd, buf.start, | |
872 | buf.length, compat_ptr(buf.ptr), | |
873 | &buf_user->start); | |
874 | break; | |
875 | } | |
876 | default: | |
0b6585ce | 877 | ret = mtd_ioctl(inode, file, cmd, (unsigned long)argp); |
97718540 KC |
878 | } |
879 | ||
880 | unlock_kernel(); | |
881 | ||
882 | return ret; | |
883 | } | |
884 | ||
885 | #endif /* CONFIG_COMPAT */ | |
886 | ||
402d3265 DH |
887 | /* |
888 | * try to determine where a shared mapping can be made | |
889 | * - only supported for NOMMU at the moment (MMU can't doesn't copy private | |
890 | * mappings) | |
891 | */ | |
892 | #ifndef CONFIG_MMU | |
893 | static unsigned long mtd_get_unmapped_area(struct file *file, | |
894 | unsigned long addr, | |
895 | unsigned long len, | |
896 | unsigned long pgoff, | |
897 | unsigned long flags) | |
898 | { | |
899 | struct mtd_file_info *mfi = file->private_data; | |
900 | struct mtd_info *mtd = mfi->mtd; | |
901 | ||
902 | if (mtd->get_unmapped_area) { | |
903 | unsigned long offset; | |
904 | ||
905 | if (addr != 0) | |
906 | return (unsigned long) -EINVAL; | |
907 | ||
908 | if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) | |
909 | return (unsigned long) -EINVAL; | |
910 | ||
911 | offset = pgoff << PAGE_SHIFT; | |
912 | if (offset > mtd->size - len) | |
913 | return (unsigned long) -EINVAL; | |
914 | ||
915 | return mtd->get_unmapped_area(mtd, len, offset, flags); | |
916 | } | |
917 | ||
918 | /* can't map directly */ | |
919 | return (unsigned long) -ENOSYS; | |
920 | } | |
921 | #endif | |
922 | ||
923 | /* | |
924 | * set up a mapping for shared memory segments | |
925 | */ | |
926 | static int mtd_mmap(struct file *file, struct vm_area_struct *vma) | |
927 | { | |
928 | #ifdef CONFIG_MMU | |
929 | struct mtd_file_info *mfi = file->private_data; | |
930 | struct mtd_info *mtd = mfi->mtd; | |
931 | ||
932 | if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) | |
933 | return 0; | |
934 | return -ENOSYS; | |
935 | #else | |
936 | return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; | |
937 | #endif | |
938 | } | |
939 | ||
d54b1fdb | 940 | static const struct file_operations mtd_fops = { |
1da177e4 LT |
941 | .owner = THIS_MODULE, |
942 | .llseek = mtd_lseek, | |
943 | .read = mtd_read, | |
944 | .write = mtd_write, | |
945 | .ioctl = mtd_ioctl, | |
97718540 KC |
946 | #ifdef CONFIG_COMPAT |
947 | .compat_ioctl = mtd_compat_ioctl, | |
948 | #endif | |
1da177e4 LT |
949 | .open = mtd_open, |
950 | .release = mtd_close, | |
402d3265 DH |
951 | .mmap = mtd_mmap, |
952 | #ifndef CONFIG_MMU | |
953 | .get_unmapped_area = mtd_get_unmapped_area, | |
954 | #endif | |
1da177e4 LT |
955 | }; |
956 | ||
957 | static int __init init_mtdchar(void) | |
958 | { | |
1f24b5a8 DB |
959 | int status; |
960 | ||
961 | status = register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops); | |
962 | if (status < 0) { | |
1da177e4 LT |
963 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", |
964 | MTD_CHAR_MAJOR); | |
9bc7b387 TP |
965 | } |
966 | ||
1f24b5a8 | 967 | return status; |
1da177e4 LT |
968 | } |
969 | ||
970 | static void __exit cleanup_mtdchar(void) | |
971 | { | |
1da177e4 LT |
972 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
973 | } | |
974 | ||
975 | module_init(init_mtdchar); | |
976 | module_exit(cleanup_mtdchar); | |
977 | ||
1f24b5a8 | 978 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |
1da177e4 LT |
979 | |
980 | MODULE_LICENSE("GPL"); | |
981 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
982 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); | |
90160e13 | 983 | MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); |