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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> | |
15 | ||
1da177e4 LT |
16 | #include <linux/mtd/mtd.h> |
17 | #include <linux/mtd/compatmac.h> | |
1da177e4 | 18 | |
15fdc52f | 19 | #include <asm/uaccess.h> |
9bc7b387 TP |
20 | |
21 | static struct class *mtd_class; | |
1da177e4 LT |
22 | |
23 | static void mtd_notify_add(struct mtd_info* mtd) | |
24 | { | |
25 | if (!mtd) | |
26 | return; | |
27 | ||
a98894ab | 28 | device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), "mtd%d", mtd->index); |
97894cda | 29 | |
a98894ab TJ |
30 | device_create(mtd_class, NULL, |
31 | MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), "mtd%dro", mtd->index); | |
1da177e4 LT |
32 | } |
33 | ||
34 | static void mtd_notify_remove(struct mtd_info* mtd) | |
35 | { | |
36 | if (!mtd) | |
37 | return; | |
9bc7b387 | 38 | |
a98894ab TJ |
39 | device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2)); |
40 | device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1)); | |
1da177e4 LT |
41 | } |
42 | ||
43 | static struct mtd_notifier notifier = { | |
44 | .add = mtd_notify_add, | |
45 | .remove = mtd_notify_remove, | |
46 | }; | |
47 | ||
045e9a5d | 48 | /* |
f1a28c02 TG |
49 | * Data structure to hold the pointer to the mtd device as well |
50 | * as mode information ofr various use cases. | |
045e9a5d | 51 | */ |
f1a28c02 TG |
52 | struct mtd_file_info { |
53 | struct mtd_info *mtd; | |
54 | enum mtd_file_modes mode; | |
55 | }; | |
31f4233b | 56 | |
1da177e4 LT |
57 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
58 | { | |
f1a28c02 TG |
59 | struct mtd_file_info *mfi = file->private_data; |
60 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
61 | |
62 | switch (orig) { | |
ea59830d | 63 | case SEEK_SET: |
1da177e4 | 64 | break; |
ea59830d | 65 | case SEEK_CUR: |
8b491d75 | 66 | offset += file->f_pos; |
1da177e4 | 67 | break; |
ea59830d | 68 | case SEEK_END: |
8b491d75 | 69 | offset += mtd->size; |
1da177e4 LT |
70 | break; |
71 | default: | |
72 | return -EINVAL; | |
73 | } | |
74 | ||
1887f517 | 75 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 76 | return file->f_pos = offset; |
1da177e4 | 77 | |
8b491d75 | 78 | return -EINVAL; |
1da177e4 LT |
79 | } |
80 | ||
81 | ||
82 | ||
83 | static int mtd_open(struct inode *inode, struct file *file) | |
84 | { | |
85 | int minor = iminor(inode); | |
86 | int devnum = minor >> 1; | |
87 | struct mtd_info *mtd; | |
f1a28c02 | 88 | struct mtd_file_info *mfi; |
1da177e4 LT |
89 | |
90 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
91 | ||
92 | if (devnum >= MAX_MTD_DEVICES) | |
93 | return -ENODEV; | |
94 | ||
95 | /* You can't open the RO devices RW */ | |
96 | if ((file->f_mode & 2) && (minor & 1)) | |
97 | return -EACCES; | |
98 | ||
99 | mtd = get_mtd_device(NULL, devnum); | |
97894cda | 100 | |
9c74034f AB |
101 | if (IS_ERR(mtd)) |
102 | return PTR_ERR(mtd); | |
97894cda | 103 | |
1da177e4 LT |
104 | if (MTD_ABSENT == mtd->type) { |
105 | put_mtd_device(mtd); | |
106 | return -ENODEV; | |
107 | } | |
108 | ||
1da177e4 LT |
109 | /* You can't open it RW if it's not a writeable device */ |
110 | if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { | |
111 | put_mtd_device(mtd); | |
112 | return -EACCES; | |
113 | } | |
97894cda | 114 | |
f1a28c02 TG |
115 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
116 | if (!mfi) { | |
117 | put_mtd_device(mtd); | |
118 | return -ENOMEM; | |
119 | } | |
120 | mfi->mtd = mtd; | |
121 | file->private_data = mfi; | |
122 | ||
1da177e4 LT |
123 | return 0; |
124 | } /* mtd_open */ | |
125 | ||
126 | /*====================================================================*/ | |
127 | ||
128 | static int mtd_close(struct inode *inode, struct file *file) | |
129 | { | |
f1a28c02 TG |
130 | struct mtd_file_info *mfi = file->private_data; |
131 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
132 | |
133 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
134 | ||
7eafaed5 JT |
135 | /* Only sync if opened RW */ |
136 | if ((file->f_mode & 2) && mtd->sync) | |
1da177e4 | 137 | mtd->sync(mtd); |
97894cda | 138 | |
1da177e4 | 139 | put_mtd_device(mtd); |
f1a28c02 TG |
140 | file->private_data = NULL; |
141 | kfree(mfi); | |
1da177e4 LT |
142 | |
143 | return 0; | |
144 | } /* mtd_close */ | |
145 | ||
146 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
147 | userspace buffer down and use it directly with readv/writev. | |
148 | */ | |
149 | #define MAX_KMALLOC_SIZE 0x20000 | |
150 | ||
151 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
152 | { | |
f1a28c02 TG |
153 | struct mtd_file_info *mfi = file->private_data; |
154 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
155 | size_t retlen=0; |
156 | size_t total_retlen=0; | |
157 | int ret=0; | |
158 | int len; | |
159 | char *kbuf; | |
97894cda | 160 | |
1da177e4 LT |
161 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
162 | ||
163 | if (*ppos + count > mtd->size) | |
164 | count = mtd->size - *ppos; | |
165 | ||
166 | if (!count) | |
167 | return 0; | |
97894cda | 168 | |
1da177e4 LT |
169 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers |
170 | and pass them directly to the MTD functions */ | |
b802c074 TG |
171 | |
172 | if (count > MAX_KMALLOC_SIZE) | |
173 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
174 | else | |
175 | kbuf=kmalloc(count, GFP_KERNEL); | |
176 | ||
177 | if (!kbuf) | |
178 | return -ENOMEM; | |
179 | ||
1da177e4 | 180 | while (count) { |
b802c074 | 181 | |
97894cda | 182 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
183 | len = MAX_KMALLOC_SIZE; |
184 | else | |
185 | len = count; | |
186 | ||
f1a28c02 TG |
187 | switch (mfi->mode) { |
188 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
189 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
190 | break; | |
191 | case MTD_MODE_OTP_USER: | |
192 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
193 | break; | |
f1a28c02 TG |
194 | case MTD_MODE_RAW: |
195 | { | |
196 | struct mtd_oob_ops ops; | |
197 | ||
198 | ops.mode = MTD_OOB_RAW; | |
199 | ops.datbuf = kbuf; | |
200 | ops.oobbuf = NULL; | |
201 | ops.len = len; | |
202 | ||
203 | ret = mtd->read_oob(mtd, *ppos, &ops); | |
204 | retlen = ops.retlen; | |
205 | break; | |
206 | } | |
31f4233b | 207 | default: |
f4a43cfc | 208 | ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 209 | } |
1da177e4 LT |
210 | /* Nand returns -EBADMSG on ecc errors, but it returns |
211 | * the data. For our userspace tools it is important | |
97894cda | 212 | * to dump areas with ecc errors ! |
9a1fcdfd TG |
213 | * For kernel internal usage it also might return -EUCLEAN |
214 | * to signal the caller that a bitflip has occured and has | |
215 | * been corrected by the ECC algorithm. | |
1da177e4 LT |
216 | * Userspace software which accesses NAND this way |
217 | * must be aware of the fact that it deals with NAND | |
218 | */ | |
9a1fcdfd | 219 | if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { |
1da177e4 LT |
220 | *ppos += retlen; |
221 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 222 | kfree(kbuf); |
1da177e4 LT |
223 | return -EFAULT; |
224 | } | |
225 | else | |
226 | total_retlen += retlen; | |
227 | ||
228 | count -= retlen; | |
229 | buf += retlen; | |
31f4233b NP |
230 | if (retlen == 0) |
231 | count = 0; | |
1da177e4 LT |
232 | } |
233 | else { | |
234 | kfree(kbuf); | |
235 | return ret; | |
236 | } | |
97894cda | 237 | |
1da177e4 LT |
238 | } |
239 | ||
b802c074 | 240 | kfree(kbuf); |
1da177e4 LT |
241 | return total_retlen; |
242 | } /* mtd_read */ | |
243 | ||
244 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
245 | { | |
f1a28c02 TG |
246 | struct mtd_file_info *mfi = file->private_data; |
247 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
248 | char *kbuf; |
249 | size_t retlen; | |
250 | size_t total_retlen=0; | |
251 | int ret=0; | |
252 | int len; | |
253 | ||
254 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 255 | |
1da177e4 LT |
256 | if (*ppos == mtd->size) |
257 | return -ENOSPC; | |
97894cda | 258 | |
1da177e4 LT |
259 | if (*ppos + count > mtd->size) |
260 | count = mtd->size - *ppos; | |
261 | ||
262 | if (!count) | |
263 | return 0; | |
264 | ||
b802c074 TG |
265 | if (count > MAX_KMALLOC_SIZE) |
266 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
267 | else | |
268 | kbuf=kmalloc(count, GFP_KERNEL); | |
269 | ||
270 | if (!kbuf) | |
271 | return -ENOMEM; | |
272 | ||
1da177e4 | 273 | while (count) { |
b802c074 | 274 | |
97894cda | 275 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
276 | len = MAX_KMALLOC_SIZE; |
277 | else | |
278 | len = count; | |
279 | ||
1da177e4 LT |
280 | if (copy_from_user(kbuf, buf, len)) { |
281 | kfree(kbuf); | |
282 | return -EFAULT; | |
283 | } | |
97894cda | 284 | |
f1a28c02 TG |
285 | switch (mfi->mode) { |
286 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
287 | ret = -EROFS; |
288 | break; | |
289 | case MTD_MODE_OTP_USER: | |
290 | if (!mtd->write_user_prot_reg) { | |
291 | ret = -EOPNOTSUPP; | |
292 | break; | |
293 | } | |
294 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
295 | break; | |
f1a28c02 TG |
296 | |
297 | case MTD_MODE_RAW: | |
298 | { | |
299 | struct mtd_oob_ops ops; | |
300 | ||
301 | ops.mode = MTD_OOB_RAW; | |
302 | ops.datbuf = kbuf; | |
303 | ops.oobbuf = NULL; | |
304 | ops.len = len; | |
305 | ||
306 | ret = mtd->write_oob(mtd, *ppos, &ops); | |
307 | retlen = ops.retlen; | |
308 | break; | |
309 | } | |
310 | ||
31f4233b NP |
311 | default: |
312 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
313 | } | |
1da177e4 LT |
314 | if (!ret) { |
315 | *ppos += retlen; | |
316 | total_retlen += retlen; | |
317 | count -= retlen; | |
318 | buf += retlen; | |
319 | } | |
320 | else { | |
321 | kfree(kbuf); | |
322 | return ret; | |
323 | } | |
1da177e4 LT |
324 | } |
325 | ||
b802c074 | 326 | kfree(kbuf); |
1da177e4 LT |
327 | return total_retlen; |
328 | } /* mtd_write */ | |
329 | ||
330 | /*====================================================================== | |
331 | ||
332 | IOCTL calls for getting device parameters. | |
333 | ||
334 | ======================================================================*/ | |
335 | static void mtdchar_erase_callback (struct erase_info *instr) | |
336 | { | |
337 | wake_up((wait_queue_head_t *)instr->priv); | |
338 | } | |
339 | ||
f1a28c02 TG |
340 | #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) |
341 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) | |
342 | { | |
343 | struct mtd_info *mtd = mfi->mtd; | |
344 | int ret = 0; | |
345 | ||
346 | switch (mode) { | |
347 | case MTD_OTP_FACTORY: | |
348 | if (!mtd->read_fact_prot_reg) | |
349 | ret = -EOPNOTSUPP; | |
350 | else | |
351 | mfi->mode = MTD_MODE_OTP_FACTORY; | |
352 | break; | |
353 | case MTD_OTP_USER: | |
354 | if (!mtd->read_fact_prot_reg) | |
355 | ret = -EOPNOTSUPP; | |
356 | else | |
357 | mfi->mode = MTD_MODE_OTP_USER; | |
358 | break; | |
359 | default: | |
360 | ret = -EINVAL; | |
361 | case MTD_OTP_OFF: | |
362 | break; | |
363 | } | |
364 | return ret; | |
365 | } | |
366 | #else | |
367 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
368 | #endif | |
369 | ||
1da177e4 LT |
370 | static int mtd_ioctl(struct inode *inode, struct file *file, |
371 | u_int cmd, u_long arg) | |
372 | { | |
f1a28c02 TG |
373 | struct mtd_file_info *mfi = file->private_data; |
374 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
375 | void __user *argp = (void __user *)arg; |
376 | int ret = 0; | |
377 | u_long size; | |
73c619ea | 378 | struct mtd_info_user info; |
97894cda | 379 | |
1da177e4 LT |
380 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
381 | ||
382 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
383 | if (cmd & IOC_IN) { | |
384 | if (!access_ok(VERIFY_READ, argp, size)) | |
385 | return -EFAULT; | |
386 | } | |
387 | if (cmd & IOC_OUT) { | |
388 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
389 | return -EFAULT; | |
390 | } | |
97894cda | 391 | |
1da177e4 LT |
392 | switch (cmd) { |
393 | case MEMGETREGIONCOUNT: | |
394 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
395 | return -EFAULT; | |
396 | break; | |
397 | ||
398 | case MEMGETREGIONINFO: | |
399 | { | |
400 | struct region_info_user ur; | |
401 | ||
402 | if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) | |
403 | return -EFAULT; | |
404 | ||
405 | if (ur.regionindex >= mtd->numeraseregions) | |
406 | return -EINVAL; | |
407 | if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), | |
408 | sizeof(struct mtd_erase_region_info))) | |
409 | return -EFAULT; | |
410 | break; | |
411 | } | |
412 | ||
413 | case MEMGETINFO: | |
73c619ea JE |
414 | info.type = mtd->type; |
415 | info.flags = mtd->flags; | |
416 | info.size = mtd->size; | |
417 | info.erasesize = mtd->erasesize; | |
418 | info.writesize = mtd->writesize; | |
419 | info.oobsize = mtd->oobsize; | |
64f60710 AB |
420 | /* The below fields are obsolete */ |
421 | info.ecctype = -1; | |
422 | info.eccsize = 0; | |
73c619ea | 423 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
424 | return -EFAULT; |
425 | break; | |
426 | ||
427 | case MEMERASE: | |
428 | { | |
429 | struct erase_info *erase; | |
430 | ||
431 | if(!(file->f_mode & 2)) | |
432 | return -EPERM; | |
433 | ||
95b93a0c | 434 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
435 | if (!erase) |
436 | ret = -ENOMEM; | |
437 | else { | |
438 | wait_queue_head_t waitq; | |
439 | DECLARE_WAITQUEUE(wait, current); | |
440 | ||
441 | init_waitqueue_head(&waitq); | |
442 | ||
1da177e4 LT |
443 | if (copy_from_user(&erase->addr, argp, |
444 | sizeof(struct erase_info_user))) { | |
445 | kfree(erase); | |
446 | return -EFAULT; | |
447 | } | |
448 | erase->mtd = mtd; | |
449 | erase->callback = mtdchar_erase_callback; | |
450 | erase->priv = (unsigned long)&waitq; | |
97894cda | 451 | |
1da177e4 LT |
452 | /* |
453 | FIXME: Allow INTERRUPTIBLE. Which means | |
454 | not having the wait_queue head on the stack. | |
97894cda | 455 | |
1da177e4 LT |
456 | If the wq_head is on the stack, and we |
457 | leave because we got interrupted, then the | |
458 | wq_head is no longer there when the | |
459 | callback routine tries to wake us up. | |
460 | */ | |
461 | ret = mtd->erase(mtd, erase); | |
462 | if (!ret) { | |
463 | set_current_state(TASK_UNINTERRUPTIBLE); | |
464 | add_wait_queue(&waitq, &wait); | |
465 | if (erase->state != MTD_ERASE_DONE && | |
466 | erase->state != MTD_ERASE_FAILED) | |
467 | schedule(); | |
468 | remove_wait_queue(&waitq, &wait); | |
469 | set_current_state(TASK_RUNNING); | |
470 | ||
471 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
472 | } | |
473 | kfree(erase); | |
474 | } | |
475 | break; | |
476 | } | |
477 | ||
478 | case MEMWRITEOOB: | |
479 | { | |
480 | struct mtd_oob_buf buf; | |
8593fbc6 | 481 | struct mtd_oob_ops ops; |
5f692837 | 482 | struct mtd_oob_buf __user *user_buf = argp; |
e9d8d482 | 483 | uint32_t retlen; |
97894cda | 484 | |
1da177e4 LT |
485 | if(!(file->f_mode & 2)) |
486 | return -EPERM; | |
487 | ||
488 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
489 | return -EFAULT; | |
97894cda | 490 | |
8593fbc6 | 491 | if (buf.length > 4096) |
1da177e4 LT |
492 | return -EINVAL; |
493 | ||
494 | if (!mtd->write_oob) | |
495 | ret = -EOPNOTSUPP; | |
496 | else | |
497 | ret = access_ok(VERIFY_READ, buf.ptr, | |
498 | buf.length) ? 0 : EFAULT; | |
499 | ||
500 | if (ret) | |
501 | return ret; | |
502 | ||
7bc3312b | 503 | ops.ooblen = buf.length; |
8593fbc6 TG |
504 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
505 | ops.datbuf = NULL; | |
506 | ops.mode = MTD_OOB_PLACE; | |
507 | ||
7014568b | 508 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
509 | return -EINVAL; |
510 | ||
511 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
512 | if (!ops.oobbuf) | |
1da177e4 | 513 | return -ENOMEM; |
97894cda | 514 | |
8593fbc6 TG |
515 | if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) { |
516 | kfree(ops.oobbuf); | |
1da177e4 LT |
517 | return -EFAULT; |
518 | } | |
519 | ||
8593fbc6 TG |
520 | buf.start &= ~(mtd->oobsize - 1); |
521 | ret = mtd->write_oob(mtd, buf.start, &ops); | |
1da177e4 | 522 | |
e9d8d482 DS |
523 | if (ops.oobretlen > 0xFFFFFFFFU) |
524 | ret = -EOVERFLOW; | |
525 | retlen = ops.oobretlen; | |
5f692837 | 526 | if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length))) |
1da177e4 LT |
527 | ret = -EFAULT; |
528 | ||
8593fbc6 | 529 | kfree(ops.oobbuf); |
1da177e4 LT |
530 | break; |
531 | ||
532 | } | |
533 | ||
534 | case MEMREADOOB: | |
535 | { | |
536 | struct mtd_oob_buf buf; | |
8593fbc6 | 537 | struct mtd_oob_ops ops; |
1da177e4 LT |
538 | |
539 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
540 | return -EFAULT; | |
97894cda | 541 | |
8593fbc6 | 542 | if (buf.length > 4096) |
1da177e4 LT |
543 | return -EINVAL; |
544 | ||
545 | if (!mtd->read_oob) | |
546 | ret = -EOPNOTSUPP; | |
547 | else | |
548 | ret = access_ok(VERIFY_WRITE, buf.ptr, | |
549 | buf.length) ? 0 : -EFAULT; | |
1da177e4 LT |
550 | if (ret) |
551 | return ret; | |
552 | ||
7bc3312b | 553 | ops.ooblen = buf.length; |
8593fbc6 TG |
554 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
555 | ops.datbuf = NULL; | |
556 | ops.mode = MTD_OOB_PLACE; | |
557 | ||
408b483d | 558 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
559 | return -EINVAL; |
560 | ||
561 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
562 | if (!ops.oobbuf) | |
1da177e4 | 563 | return -ENOMEM; |
97894cda | 564 | |
8593fbc6 TG |
565 | buf.start &= ~(mtd->oobsize - 1); |
566 | ret = mtd->read_oob(mtd, buf.start, &ops); | |
1da177e4 | 567 | |
7014568b | 568 | if (put_user(ops.oobretlen, (uint32_t __user *)argp)) |
1da177e4 | 569 | ret = -EFAULT; |
7014568b VW |
570 | else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf, |
571 | ops.oobretlen)) | |
1da177e4 | 572 | ret = -EFAULT; |
97894cda | 573 | |
8593fbc6 | 574 | kfree(ops.oobbuf); |
1da177e4 LT |
575 | break; |
576 | } | |
577 | ||
578 | case MEMLOCK: | |
579 | { | |
580 | struct erase_info_user info; | |
581 | ||
582 | if (copy_from_user(&info, argp, sizeof(info))) | |
583 | return -EFAULT; | |
584 | ||
585 | if (!mtd->lock) | |
586 | ret = -EOPNOTSUPP; | |
587 | else | |
588 | ret = mtd->lock(mtd, info.start, info.length); | |
589 | break; | |
590 | } | |
591 | ||
592 | case MEMUNLOCK: | |
593 | { | |
594 | struct erase_info_user info; | |
595 | ||
596 | if (copy_from_user(&info, argp, sizeof(info))) | |
597 | return -EFAULT; | |
598 | ||
599 | if (!mtd->unlock) | |
600 | ret = -EOPNOTSUPP; | |
601 | else | |
602 | ret = mtd->unlock(mtd, info.start, info.length); | |
603 | break; | |
604 | } | |
605 | ||
5bd34c09 | 606 | /* Legacy interface */ |
1da177e4 LT |
607 | case MEMGETOOBSEL: |
608 | { | |
5bd34c09 TG |
609 | struct nand_oobinfo oi; |
610 | ||
611 | if (!mtd->ecclayout) | |
612 | return -EOPNOTSUPP; | |
613 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
614 | return -EINVAL; | |
615 | ||
616 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
617 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
618 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
619 | sizeof(oi.oobfree)); | |
d25ade71 | 620 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
621 | |
622 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
623 | return -EFAULT; |
624 | break; | |
625 | } | |
626 | ||
627 | case MEMGETBADBLOCK: | |
628 | { | |
629 | loff_t offs; | |
97894cda | 630 | |
1da177e4 LT |
631 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
632 | return -EFAULT; | |
633 | if (!mtd->block_isbad) | |
634 | ret = -EOPNOTSUPP; | |
635 | else | |
636 | return mtd->block_isbad(mtd, offs); | |
637 | break; | |
638 | } | |
639 | ||
640 | case MEMSETBADBLOCK: | |
641 | { | |
642 | loff_t offs; | |
643 | ||
644 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
645 | return -EFAULT; | |
646 | if (!mtd->block_markbad) | |
647 | ret = -EOPNOTSUPP; | |
648 | else | |
649 | return mtd->block_markbad(mtd, offs); | |
650 | break; | |
651 | } | |
652 | ||
493c6460 | 653 | #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) |
31f4233b NP |
654 | case OTPSELECT: |
655 | { | |
656 | int mode; | |
657 | if (copy_from_user(&mode, argp, sizeof(int))) | |
658 | return -EFAULT; | |
f1a28c02 TG |
659 | |
660 | mfi->mode = MTD_MODE_NORMAL; | |
661 | ||
662 | ret = otp_select_filemode(mfi, mode); | |
663 | ||
81dba488 | 664 | file->f_pos = 0; |
31f4233b NP |
665 | break; |
666 | } | |
667 | ||
668 | case OTPGETREGIONCOUNT: | |
669 | case OTPGETREGIONINFO: | |
670 | { | |
671 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
672 | if (!buf) | |
673 | return -ENOMEM; | |
674 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
675 | switch (mfi->mode) { |
676 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
677 | if (mtd->get_fact_prot_info) |
678 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
679 | break; | |
680 | case MTD_MODE_OTP_USER: | |
681 | if (mtd->get_user_prot_info) | |
682 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
683 | break; | |
f1a28c02 TG |
684 | default: |
685 | break; | |
31f4233b NP |
686 | } |
687 | if (ret >= 0) { | |
688 | if (cmd == OTPGETREGIONCOUNT) { | |
689 | int nbr = ret / sizeof(struct otp_info); | |
690 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
691 | } else | |
692 | ret = copy_to_user(argp, buf, ret); | |
693 | if (ret) | |
694 | ret = -EFAULT; | |
695 | } | |
696 | kfree(buf); | |
697 | break; | |
698 | } | |
699 | ||
700 | case OTPLOCK: | |
701 | { | |
702 | struct otp_info info; | |
703 | ||
f1a28c02 | 704 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b NP |
705 | return -EINVAL; |
706 | if (copy_from_user(&info, argp, sizeof(info))) | |
707 | return -EFAULT; | |
708 | if (!mtd->lock_user_prot_reg) | |
709 | return -EOPNOTSUPP; | |
710 | ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); | |
711 | break; | |
712 | } | |
713 | #endif | |
714 | ||
f1a28c02 TG |
715 | case ECCGETLAYOUT: |
716 | { | |
717 | if (!mtd->ecclayout) | |
718 | return -EOPNOTSUPP; | |
719 | ||
d25ade71 | 720 | if (copy_to_user(argp, mtd->ecclayout, |
f1a28c02 TG |
721 | sizeof(struct nand_ecclayout))) |
722 | return -EFAULT; | |
723 | break; | |
724 | } | |
725 | ||
726 | case ECCGETSTATS: | |
727 | { | |
728 | if (copy_to_user(argp, &mtd->ecc_stats, | |
729 | sizeof(struct mtd_ecc_stats))) | |
730 | return -EFAULT; | |
731 | break; | |
732 | } | |
733 | ||
734 | case MTDFILEMODE: | |
735 | { | |
736 | mfi->mode = 0; | |
737 | ||
738 | switch(arg) { | |
739 | case MTD_MODE_OTP_FACTORY: | |
740 | case MTD_MODE_OTP_USER: | |
741 | ret = otp_select_filemode(mfi, arg); | |
742 | break; | |
743 | ||
744 | case MTD_MODE_RAW: | |
745 | if (!mtd->read_oob || !mtd->write_oob) | |
746 | return -EOPNOTSUPP; | |
747 | mfi->mode = arg; | |
748 | ||
749 | case MTD_MODE_NORMAL: | |
750 | break; | |
751 | default: | |
752 | ret = -EINVAL; | |
753 | } | |
754 | file->f_pos = 0; | |
755 | break; | |
756 | } | |
757 | ||
1da177e4 LT |
758 | default: |
759 | ret = -ENOTTY; | |
760 | } | |
761 | ||
762 | return ret; | |
763 | } /* memory_ioctl */ | |
764 | ||
d54b1fdb | 765 | static const struct file_operations mtd_fops = { |
1da177e4 LT |
766 | .owner = THIS_MODULE, |
767 | .llseek = mtd_lseek, | |
768 | .read = mtd_read, | |
769 | .write = mtd_write, | |
770 | .ioctl = mtd_ioctl, | |
771 | .open = mtd_open, | |
772 | .release = mtd_close, | |
773 | }; | |
774 | ||
775 | static int __init init_mtdchar(void) | |
776 | { | |
777 | if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { | |
778 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", | |
779 | MTD_CHAR_MAJOR); | |
780 | return -EAGAIN; | |
781 | } | |
782 | ||
9bc7b387 TP |
783 | mtd_class = class_create(THIS_MODULE, "mtd"); |
784 | ||
785 | if (IS_ERR(mtd_class)) { | |
786 | printk(KERN_ERR "Error creating mtd class.\n"); | |
787 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); | |
3a7a8824 | 788 | return PTR_ERR(mtd_class); |
9bc7b387 TP |
789 | } |
790 | ||
791 | register_mtd_user(¬ifier); | |
1da177e4 LT |
792 | return 0; |
793 | } | |
794 | ||
795 | static void __exit cleanup_mtdchar(void) | |
796 | { | |
9bc7b387 TP |
797 | unregister_mtd_user(¬ifier); |
798 | class_destroy(mtd_class); | |
1da177e4 LT |
799 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
800 | } | |
801 | ||
802 | module_init(init_mtdchar); | |
803 | module_exit(cleanup_mtdchar); | |
804 | ||
805 | ||
806 | MODULE_LICENSE("GPL"); | |
807 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
808 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); |