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> |
15fdc52f | 16 | |
1da177e4 LT |
17 | #include <linux/mtd/mtd.h> |
18 | #include <linux/mtd/compatmac.h> | |
1da177e4 | 19 | |
15fdc52f | 20 | #include <asm/uaccess.h> |
9bc7b387 TP |
21 | |
22 | static struct class *mtd_class; | |
1da177e4 LT |
23 | |
24 | static void mtd_notify_add(struct mtd_info* mtd) | |
25 | { | |
26 | if (!mtd) | |
27 | return; | |
28 | ||
daea34bc GKH |
29 | device_create_drvdata(mtd_class, NULL, |
30 | MKDEV(MTD_CHAR_MAJOR, mtd->index*2), | |
31 | NULL, "mtd%d", mtd->index); | |
97894cda | 32 | |
daea34bc GKH |
33 | device_create_drvdata(mtd_class, NULL, |
34 | MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), | |
35 | NULL, "mtd%dro", mtd->index); | |
1da177e4 LT |
36 | } |
37 | ||
38 | static void mtd_notify_remove(struct mtd_info* mtd) | |
39 | { | |
40 | if (!mtd) | |
41 | return; | |
9bc7b387 | 42 | |
a98894ab TJ |
43 | device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2)); |
44 | device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1)); | |
1da177e4 LT |
45 | } |
46 | ||
47 | static struct mtd_notifier notifier = { | |
48 | .add = mtd_notify_add, | |
49 | .remove = mtd_notify_remove, | |
50 | }; | |
51 | ||
045e9a5d | 52 | /* |
f1a28c02 TG |
53 | * Data structure to hold the pointer to the mtd device as well |
54 | * as mode information ofr various use cases. | |
045e9a5d | 55 | */ |
f1a28c02 TG |
56 | struct mtd_file_info { |
57 | struct mtd_info *mtd; | |
58 | enum mtd_file_modes mode; | |
59 | }; | |
31f4233b | 60 | |
1da177e4 LT |
61 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
62 | { | |
f1a28c02 TG |
63 | struct mtd_file_info *mfi = file->private_data; |
64 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
65 | |
66 | switch (orig) { | |
ea59830d | 67 | case SEEK_SET: |
1da177e4 | 68 | break; |
ea59830d | 69 | case SEEK_CUR: |
8b491d75 | 70 | offset += file->f_pos; |
1da177e4 | 71 | break; |
ea59830d | 72 | case SEEK_END: |
8b491d75 | 73 | offset += mtd->size; |
1da177e4 LT |
74 | break; |
75 | default: | |
76 | return -EINVAL; | |
77 | } | |
78 | ||
1887f517 | 79 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 80 | return file->f_pos = offset; |
1da177e4 | 81 | |
8b491d75 | 82 | return -EINVAL; |
1da177e4 LT |
83 | } |
84 | ||
85 | ||
86 | ||
87 | static int mtd_open(struct inode *inode, struct file *file) | |
88 | { | |
89 | int minor = iminor(inode); | |
90 | int devnum = minor >> 1; | |
6071239e | 91 | int ret = 0; |
1da177e4 | 92 | struct mtd_info *mtd; |
f1a28c02 | 93 | struct mtd_file_info *mfi; |
1da177e4 LT |
94 | |
95 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
96 | ||
97 | if (devnum >= MAX_MTD_DEVICES) | |
98 | return -ENODEV; | |
99 | ||
100 | /* You can't open the RO devices RW */ | |
101 | if ((file->f_mode & 2) && (minor & 1)) | |
102 | return -EACCES; | |
103 | ||
6071239e | 104 | lock_kernel(); |
1da177e4 | 105 | mtd = get_mtd_device(NULL, devnum); |
97894cda | 106 | |
6071239e JC |
107 | if (IS_ERR(mtd)) { |
108 | ret = PTR_ERR(mtd); | |
109 | goto out; | |
110 | } | |
97894cda | 111 | |
1da177e4 LT |
112 | if (MTD_ABSENT == mtd->type) { |
113 | put_mtd_device(mtd); | |
6071239e JC |
114 | ret = -ENODEV; |
115 | goto out; | |
1da177e4 LT |
116 | } |
117 | ||
1da177e4 LT |
118 | /* You can't open it RW if it's not a writeable device */ |
119 | if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { | |
120 | put_mtd_device(mtd); | |
6071239e JC |
121 | ret = -EACCES; |
122 | goto out; | |
1da177e4 | 123 | } |
97894cda | 124 | |
f1a28c02 TG |
125 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
126 | if (!mfi) { | |
127 | put_mtd_device(mtd); | |
6071239e JC |
128 | ret = -ENOMEM; |
129 | goto out; | |
f1a28c02 TG |
130 | } |
131 | mfi->mtd = mtd; | |
132 | file->private_data = mfi; | |
133 | ||
6071239e JC |
134 | out: |
135 | unlock_kernel(); | |
136 | return ret; | |
1da177e4 LT |
137 | } /* mtd_open */ |
138 | ||
139 | /*====================================================================*/ | |
140 | ||
141 | static int mtd_close(struct inode *inode, struct file *file) | |
142 | { | |
f1a28c02 TG |
143 | struct mtd_file_info *mfi = file->private_data; |
144 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
145 | |
146 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
147 | ||
7eafaed5 JT |
148 | /* Only sync if opened RW */ |
149 | if ((file->f_mode & 2) && mtd->sync) | |
1da177e4 | 150 | mtd->sync(mtd); |
97894cda | 151 | |
1da177e4 | 152 | put_mtd_device(mtd); |
f1a28c02 TG |
153 | file->private_data = NULL; |
154 | kfree(mfi); | |
1da177e4 LT |
155 | |
156 | return 0; | |
157 | } /* mtd_close */ | |
158 | ||
159 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
160 | userspace buffer down and use it directly with readv/writev. | |
161 | */ | |
162 | #define MAX_KMALLOC_SIZE 0x20000 | |
163 | ||
164 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
165 | { | |
f1a28c02 TG |
166 | struct mtd_file_info *mfi = file->private_data; |
167 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
168 | size_t retlen=0; |
169 | size_t total_retlen=0; | |
170 | int ret=0; | |
171 | int len; | |
172 | char *kbuf; | |
97894cda | 173 | |
1da177e4 LT |
174 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
175 | ||
176 | if (*ppos + count > mtd->size) | |
177 | count = mtd->size - *ppos; | |
178 | ||
179 | if (!count) | |
180 | return 0; | |
97894cda | 181 | |
1da177e4 LT |
182 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers |
183 | and pass them directly to the MTD functions */ | |
b802c074 TG |
184 | |
185 | if (count > MAX_KMALLOC_SIZE) | |
186 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
187 | else | |
188 | kbuf=kmalloc(count, GFP_KERNEL); | |
189 | ||
190 | if (!kbuf) | |
191 | return -ENOMEM; | |
192 | ||
1da177e4 | 193 | while (count) { |
b802c074 | 194 | |
97894cda | 195 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
196 | len = MAX_KMALLOC_SIZE; |
197 | else | |
198 | len = count; | |
199 | ||
f1a28c02 TG |
200 | switch (mfi->mode) { |
201 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
202 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
203 | break; | |
204 | case MTD_MODE_OTP_USER: | |
205 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
206 | break; | |
f1a28c02 TG |
207 | case MTD_MODE_RAW: |
208 | { | |
209 | struct mtd_oob_ops ops; | |
210 | ||
211 | ops.mode = MTD_OOB_RAW; | |
212 | ops.datbuf = kbuf; | |
213 | ops.oobbuf = NULL; | |
214 | ops.len = len; | |
215 | ||
216 | ret = mtd->read_oob(mtd, *ppos, &ops); | |
217 | retlen = ops.retlen; | |
218 | break; | |
219 | } | |
31f4233b | 220 | default: |
f4a43cfc | 221 | ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 222 | } |
1da177e4 LT |
223 | /* Nand returns -EBADMSG on ecc errors, but it returns |
224 | * the data. For our userspace tools it is important | |
97894cda | 225 | * to dump areas with ecc errors ! |
9a1fcdfd TG |
226 | * For kernel internal usage it also might return -EUCLEAN |
227 | * to signal the caller that a bitflip has occured and has | |
228 | * been corrected by the ECC algorithm. | |
1da177e4 LT |
229 | * Userspace software which accesses NAND this way |
230 | * must be aware of the fact that it deals with NAND | |
231 | */ | |
9a1fcdfd | 232 | if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { |
1da177e4 LT |
233 | *ppos += retlen; |
234 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 235 | kfree(kbuf); |
1da177e4 LT |
236 | return -EFAULT; |
237 | } | |
238 | else | |
239 | total_retlen += retlen; | |
240 | ||
241 | count -= retlen; | |
242 | buf += retlen; | |
31f4233b NP |
243 | if (retlen == 0) |
244 | count = 0; | |
1da177e4 LT |
245 | } |
246 | else { | |
247 | kfree(kbuf); | |
248 | return ret; | |
249 | } | |
97894cda | 250 | |
1da177e4 LT |
251 | } |
252 | ||
b802c074 | 253 | kfree(kbuf); |
1da177e4 LT |
254 | return total_retlen; |
255 | } /* mtd_read */ | |
256 | ||
257 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
258 | { | |
f1a28c02 TG |
259 | struct mtd_file_info *mfi = file->private_data; |
260 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
261 | char *kbuf; |
262 | size_t retlen; | |
263 | size_t total_retlen=0; | |
264 | int ret=0; | |
265 | int len; | |
266 | ||
267 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 268 | |
1da177e4 LT |
269 | if (*ppos == mtd->size) |
270 | return -ENOSPC; | |
97894cda | 271 | |
1da177e4 LT |
272 | if (*ppos + count > mtd->size) |
273 | count = mtd->size - *ppos; | |
274 | ||
275 | if (!count) | |
276 | return 0; | |
277 | ||
b802c074 TG |
278 | if (count > MAX_KMALLOC_SIZE) |
279 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
280 | else | |
281 | kbuf=kmalloc(count, GFP_KERNEL); | |
282 | ||
283 | if (!kbuf) | |
284 | return -ENOMEM; | |
285 | ||
1da177e4 | 286 | while (count) { |
b802c074 | 287 | |
97894cda | 288 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
289 | len = MAX_KMALLOC_SIZE; |
290 | else | |
291 | len = count; | |
292 | ||
1da177e4 LT |
293 | if (copy_from_user(kbuf, buf, len)) { |
294 | kfree(kbuf); | |
295 | return -EFAULT; | |
296 | } | |
97894cda | 297 | |
f1a28c02 TG |
298 | switch (mfi->mode) { |
299 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
300 | ret = -EROFS; |
301 | break; | |
302 | case MTD_MODE_OTP_USER: | |
303 | if (!mtd->write_user_prot_reg) { | |
304 | ret = -EOPNOTSUPP; | |
305 | break; | |
306 | } | |
307 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
308 | break; | |
f1a28c02 TG |
309 | |
310 | case MTD_MODE_RAW: | |
311 | { | |
312 | struct mtd_oob_ops ops; | |
313 | ||
314 | ops.mode = MTD_OOB_RAW; | |
315 | ops.datbuf = kbuf; | |
316 | ops.oobbuf = NULL; | |
317 | ops.len = len; | |
318 | ||
319 | ret = mtd->write_oob(mtd, *ppos, &ops); | |
320 | retlen = ops.retlen; | |
321 | break; | |
322 | } | |
323 | ||
31f4233b NP |
324 | default: |
325 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
326 | } | |
1da177e4 LT |
327 | if (!ret) { |
328 | *ppos += retlen; | |
329 | total_retlen += retlen; | |
330 | count -= retlen; | |
331 | buf += retlen; | |
332 | } | |
333 | else { | |
334 | kfree(kbuf); | |
335 | return ret; | |
336 | } | |
1da177e4 LT |
337 | } |
338 | ||
b802c074 | 339 | kfree(kbuf); |
1da177e4 LT |
340 | return total_retlen; |
341 | } /* mtd_write */ | |
342 | ||
343 | /*====================================================================== | |
344 | ||
345 | IOCTL calls for getting device parameters. | |
346 | ||
347 | ======================================================================*/ | |
348 | static void mtdchar_erase_callback (struct erase_info *instr) | |
349 | { | |
350 | wake_up((wait_queue_head_t *)instr->priv); | |
351 | } | |
352 | ||
34a82443 | 353 | #ifdef CONFIG_HAVE_MTD_OTP |
f1a28c02 TG |
354 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
355 | { | |
356 | struct mtd_info *mtd = mfi->mtd; | |
357 | int ret = 0; | |
358 | ||
359 | switch (mode) { | |
360 | case MTD_OTP_FACTORY: | |
361 | if (!mtd->read_fact_prot_reg) | |
362 | ret = -EOPNOTSUPP; | |
363 | else | |
364 | mfi->mode = MTD_MODE_OTP_FACTORY; | |
365 | break; | |
366 | case MTD_OTP_USER: | |
367 | if (!mtd->read_fact_prot_reg) | |
368 | ret = -EOPNOTSUPP; | |
369 | else | |
370 | mfi->mode = MTD_MODE_OTP_USER; | |
371 | break; | |
372 | default: | |
373 | ret = -EINVAL; | |
374 | case MTD_OTP_OFF: | |
375 | break; | |
376 | } | |
377 | return ret; | |
378 | } | |
379 | #else | |
380 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
381 | #endif | |
382 | ||
1da177e4 LT |
383 | static int mtd_ioctl(struct inode *inode, struct file *file, |
384 | u_int cmd, u_long arg) | |
385 | { | |
f1a28c02 TG |
386 | struct mtd_file_info *mfi = file->private_data; |
387 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
388 | void __user *argp = (void __user *)arg; |
389 | int ret = 0; | |
390 | u_long size; | |
73c619ea | 391 | struct mtd_info_user info; |
97894cda | 392 | |
1da177e4 LT |
393 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
394 | ||
395 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
396 | if (cmd & IOC_IN) { | |
397 | if (!access_ok(VERIFY_READ, argp, size)) | |
398 | return -EFAULT; | |
399 | } | |
400 | if (cmd & IOC_OUT) { | |
401 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
402 | return -EFAULT; | |
403 | } | |
97894cda | 404 | |
1da177e4 LT |
405 | switch (cmd) { |
406 | case MEMGETREGIONCOUNT: | |
407 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
408 | return -EFAULT; | |
409 | break; | |
410 | ||
411 | case MEMGETREGIONINFO: | |
412 | { | |
413 | struct region_info_user ur; | |
414 | ||
415 | if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) | |
416 | return -EFAULT; | |
417 | ||
418 | if (ur.regionindex >= mtd->numeraseregions) | |
419 | return -EINVAL; | |
420 | if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), | |
421 | sizeof(struct mtd_erase_region_info))) | |
422 | return -EFAULT; | |
423 | break; | |
424 | } | |
425 | ||
426 | case MEMGETINFO: | |
73c619ea JE |
427 | info.type = mtd->type; |
428 | info.flags = mtd->flags; | |
429 | info.size = mtd->size; | |
430 | info.erasesize = mtd->erasesize; | |
431 | info.writesize = mtd->writesize; | |
432 | info.oobsize = mtd->oobsize; | |
64f60710 AB |
433 | /* The below fields are obsolete */ |
434 | info.ecctype = -1; | |
435 | info.eccsize = 0; | |
73c619ea | 436 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
1da177e4 LT |
437 | return -EFAULT; |
438 | break; | |
439 | ||
440 | case MEMERASE: | |
441 | { | |
442 | struct erase_info *erase; | |
443 | ||
444 | if(!(file->f_mode & 2)) | |
445 | return -EPERM; | |
446 | ||
95b93a0c | 447 | erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
1da177e4 LT |
448 | if (!erase) |
449 | ret = -ENOMEM; | |
450 | else { | |
451 | wait_queue_head_t waitq; | |
452 | DECLARE_WAITQUEUE(wait, current); | |
453 | ||
454 | init_waitqueue_head(&waitq); | |
455 | ||
1da177e4 LT |
456 | if (copy_from_user(&erase->addr, argp, |
457 | sizeof(struct erase_info_user))) { | |
458 | kfree(erase); | |
459 | return -EFAULT; | |
460 | } | |
461 | erase->mtd = mtd; | |
462 | erase->callback = mtdchar_erase_callback; | |
463 | erase->priv = (unsigned long)&waitq; | |
97894cda | 464 | |
1da177e4 LT |
465 | /* |
466 | FIXME: Allow INTERRUPTIBLE. Which means | |
467 | not having the wait_queue head on the stack. | |
97894cda | 468 | |
1da177e4 LT |
469 | If the wq_head is on the stack, and we |
470 | leave because we got interrupted, then the | |
471 | wq_head is no longer there when the | |
472 | callback routine tries to wake us up. | |
473 | */ | |
474 | ret = mtd->erase(mtd, erase); | |
475 | if (!ret) { | |
476 | set_current_state(TASK_UNINTERRUPTIBLE); | |
477 | add_wait_queue(&waitq, &wait); | |
478 | if (erase->state != MTD_ERASE_DONE && | |
479 | erase->state != MTD_ERASE_FAILED) | |
480 | schedule(); | |
481 | remove_wait_queue(&waitq, &wait); | |
482 | set_current_state(TASK_RUNNING); | |
483 | ||
484 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
485 | } | |
486 | kfree(erase); | |
487 | } | |
488 | break; | |
489 | } | |
490 | ||
491 | case MEMWRITEOOB: | |
492 | { | |
493 | struct mtd_oob_buf buf; | |
8593fbc6 | 494 | struct mtd_oob_ops ops; |
5f692837 | 495 | struct mtd_oob_buf __user *user_buf = argp; |
e9d8d482 | 496 | uint32_t retlen; |
97894cda | 497 | |
1da177e4 LT |
498 | if(!(file->f_mode & 2)) |
499 | return -EPERM; | |
500 | ||
501 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
502 | return -EFAULT; | |
97894cda | 503 | |
8593fbc6 | 504 | if (buf.length > 4096) |
1da177e4 LT |
505 | return -EINVAL; |
506 | ||
507 | if (!mtd->write_oob) | |
508 | ret = -EOPNOTSUPP; | |
509 | else | |
510 | ret = access_ok(VERIFY_READ, buf.ptr, | |
511 | buf.length) ? 0 : EFAULT; | |
512 | ||
513 | if (ret) | |
514 | return ret; | |
515 | ||
7bc3312b | 516 | ops.ooblen = buf.length; |
8593fbc6 TG |
517 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
518 | ops.datbuf = NULL; | |
519 | ops.mode = MTD_OOB_PLACE; | |
520 | ||
7014568b | 521 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
522 | return -EINVAL; |
523 | ||
524 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
525 | if (!ops.oobbuf) | |
1da177e4 | 526 | return -ENOMEM; |
97894cda | 527 | |
8593fbc6 TG |
528 | if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) { |
529 | kfree(ops.oobbuf); | |
1da177e4 LT |
530 | return -EFAULT; |
531 | } | |
532 | ||
8593fbc6 TG |
533 | buf.start &= ~(mtd->oobsize - 1); |
534 | ret = mtd->write_oob(mtd, buf.start, &ops); | |
1da177e4 | 535 | |
e9d8d482 DS |
536 | if (ops.oobretlen > 0xFFFFFFFFU) |
537 | ret = -EOVERFLOW; | |
538 | retlen = ops.oobretlen; | |
5f692837 | 539 | if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length))) |
1da177e4 LT |
540 | ret = -EFAULT; |
541 | ||
8593fbc6 | 542 | kfree(ops.oobbuf); |
1da177e4 LT |
543 | break; |
544 | ||
545 | } | |
546 | ||
547 | case MEMREADOOB: | |
548 | { | |
549 | struct mtd_oob_buf buf; | |
8593fbc6 | 550 | struct mtd_oob_ops ops; |
1da177e4 LT |
551 | |
552 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
553 | return -EFAULT; | |
97894cda | 554 | |
8593fbc6 | 555 | if (buf.length > 4096) |
1da177e4 LT |
556 | return -EINVAL; |
557 | ||
558 | if (!mtd->read_oob) | |
559 | ret = -EOPNOTSUPP; | |
560 | else | |
561 | ret = access_ok(VERIFY_WRITE, buf.ptr, | |
562 | buf.length) ? 0 : -EFAULT; | |
1da177e4 LT |
563 | if (ret) |
564 | return ret; | |
565 | ||
7bc3312b | 566 | ops.ooblen = buf.length; |
8593fbc6 TG |
567 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
568 | ops.datbuf = NULL; | |
569 | ops.mode = MTD_OOB_PLACE; | |
570 | ||
408b483d | 571 | if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
572 | return -EINVAL; |
573 | ||
574 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
575 | if (!ops.oobbuf) | |
1da177e4 | 576 | return -ENOMEM; |
97894cda | 577 | |
8593fbc6 TG |
578 | buf.start &= ~(mtd->oobsize - 1); |
579 | ret = mtd->read_oob(mtd, buf.start, &ops); | |
1da177e4 | 580 | |
7014568b | 581 | if (put_user(ops.oobretlen, (uint32_t __user *)argp)) |
1da177e4 | 582 | ret = -EFAULT; |
7014568b VW |
583 | else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf, |
584 | ops.oobretlen)) | |
1da177e4 | 585 | ret = -EFAULT; |
97894cda | 586 | |
8593fbc6 | 587 | kfree(ops.oobbuf); |
1da177e4 LT |
588 | break; |
589 | } | |
590 | ||
591 | case MEMLOCK: | |
592 | { | |
175428b2 | 593 | struct erase_info_user einfo; |
1da177e4 | 594 | |
175428b2 | 595 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
596 | return -EFAULT; |
597 | ||
598 | if (!mtd->lock) | |
599 | ret = -EOPNOTSUPP; | |
600 | else | |
175428b2 | 601 | ret = mtd->lock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
602 | break; |
603 | } | |
604 | ||
605 | case MEMUNLOCK: | |
606 | { | |
175428b2 | 607 | struct erase_info_user einfo; |
1da177e4 | 608 | |
175428b2 | 609 | if (copy_from_user(&einfo, argp, sizeof(einfo))) |
1da177e4 LT |
610 | return -EFAULT; |
611 | ||
612 | if (!mtd->unlock) | |
613 | ret = -EOPNOTSUPP; | |
614 | else | |
175428b2 | 615 | ret = mtd->unlock(mtd, einfo.start, einfo.length); |
1da177e4 LT |
616 | break; |
617 | } | |
618 | ||
5bd34c09 | 619 | /* Legacy interface */ |
1da177e4 LT |
620 | case MEMGETOOBSEL: |
621 | { | |
5bd34c09 TG |
622 | struct nand_oobinfo oi; |
623 | ||
624 | if (!mtd->ecclayout) | |
625 | return -EOPNOTSUPP; | |
626 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
627 | return -EINVAL; | |
628 | ||
629 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
630 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
631 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
632 | sizeof(oi.oobfree)); | |
d25ade71 | 633 | oi.eccbytes = mtd->ecclayout->eccbytes; |
5bd34c09 TG |
634 | |
635 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
636 | return -EFAULT; |
637 | break; | |
638 | } | |
639 | ||
640 | case MEMGETBADBLOCK: | |
641 | { | |
642 | loff_t offs; | |
97894cda | 643 | |
1da177e4 LT |
644 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
645 | return -EFAULT; | |
646 | if (!mtd->block_isbad) | |
647 | ret = -EOPNOTSUPP; | |
648 | else | |
649 | return mtd->block_isbad(mtd, offs); | |
650 | break; | |
651 | } | |
652 | ||
653 | case MEMSETBADBLOCK: | |
654 | { | |
655 | loff_t offs; | |
656 | ||
657 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
658 | return -EFAULT; | |
659 | if (!mtd->block_markbad) | |
660 | ret = -EOPNOTSUPP; | |
661 | else | |
662 | return mtd->block_markbad(mtd, offs); | |
663 | break; | |
664 | } | |
665 | ||
34a82443 | 666 | #ifdef CONFIG_HAVE_MTD_OTP |
31f4233b NP |
667 | case OTPSELECT: |
668 | { | |
669 | int mode; | |
670 | if (copy_from_user(&mode, argp, sizeof(int))) | |
671 | return -EFAULT; | |
f1a28c02 TG |
672 | |
673 | mfi->mode = MTD_MODE_NORMAL; | |
674 | ||
675 | ret = otp_select_filemode(mfi, mode); | |
676 | ||
81dba488 | 677 | file->f_pos = 0; |
31f4233b NP |
678 | break; |
679 | } | |
680 | ||
681 | case OTPGETREGIONCOUNT: | |
682 | case OTPGETREGIONINFO: | |
683 | { | |
684 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
685 | if (!buf) | |
686 | return -ENOMEM; | |
687 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
688 | switch (mfi->mode) { |
689 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
690 | if (mtd->get_fact_prot_info) |
691 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
692 | break; | |
693 | case MTD_MODE_OTP_USER: | |
694 | if (mtd->get_user_prot_info) | |
695 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
696 | break; | |
f1a28c02 TG |
697 | default: |
698 | break; | |
31f4233b NP |
699 | } |
700 | if (ret >= 0) { | |
701 | if (cmd == OTPGETREGIONCOUNT) { | |
702 | int nbr = ret / sizeof(struct otp_info); | |
703 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
704 | } else | |
705 | ret = copy_to_user(argp, buf, ret); | |
706 | if (ret) | |
707 | ret = -EFAULT; | |
708 | } | |
709 | kfree(buf); | |
710 | break; | |
711 | } | |
712 | ||
713 | case OTPLOCK: | |
714 | { | |
175428b2 | 715 | struct otp_info oinfo; |
31f4233b | 716 | |
f1a28c02 | 717 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b | 718 | return -EINVAL; |
175428b2 | 719 | if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
31f4233b NP |
720 | return -EFAULT; |
721 | if (!mtd->lock_user_prot_reg) | |
722 | return -EOPNOTSUPP; | |
175428b2 | 723 | ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
31f4233b NP |
724 | break; |
725 | } | |
726 | #endif | |
727 | ||
f1a28c02 TG |
728 | case ECCGETLAYOUT: |
729 | { | |
730 | if (!mtd->ecclayout) | |
731 | return -EOPNOTSUPP; | |
732 | ||
d25ade71 | 733 | if (copy_to_user(argp, mtd->ecclayout, |
f1a28c02 TG |
734 | sizeof(struct nand_ecclayout))) |
735 | return -EFAULT; | |
736 | break; | |
737 | } | |
738 | ||
739 | case ECCGETSTATS: | |
740 | { | |
741 | if (copy_to_user(argp, &mtd->ecc_stats, | |
742 | sizeof(struct mtd_ecc_stats))) | |
743 | return -EFAULT; | |
744 | break; | |
745 | } | |
746 | ||
747 | case MTDFILEMODE: | |
748 | { | |
749 | mfi->mode = 0; | |
750 | ||
751 | switch(arg) { | |
752 | case MTD_MODE_OTP_FACTORY: | |
753 | case MTD_MODE_OTP_USER: | |
754 | ret = otp_select_filemode(mfi, arg); | |
755 | break; | |
756 | ||
757 | case MTD_MODE_RAW: | |
758 | if (!mtd->read_oob || !mtd->write_oob) | |
759 | return -EOPNOTSUPP; | |
760 | mfi->mode = arg; | |
761 | ||
762 | case MTD_MODE_NORMAL: | |
763 | break; | |
764 | default: | |
765 | ret = -EINVAL; | |
766 | } | |
767 | file->f_pos = 0; | |
768 | break; | |
769 | } | |
770 | ||
1da177e4 LT |
771 | default: |
772 | ret = -ENOTTY; | |
773 | } | |
774 | ||
775 | return ret; | |
776 | } /* memory_ioctl */ | |
777 | ||
d54b1fdb | 778 | static const struct file_operations mtd_fops = { |
1da177e4 LT |
779 | .owner = THIS_MODULE, |
780 | .llseek = mtd_lseek, | |
781 | .read = mtd_read, | |
782 | .write = mtd_write, | |
783 | .ioctl = mtd_ioctl, | |
784 | .open = mtd_open, | |
785 | .release = mtd_close, | |
786 | }; | |
787 | ||
788 | static int __init init_mtdchar(void) | |
789 | { | |
790 | if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { | |
791 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", | |
792 | MTD_CHAR_MAJOR); | |
793 | return -EAGAIN; | |
794 | } | |
795 | ||
9bc7b387 TP |
796 | mtd_class = class_create(THIS_MODULE, "mtd"); |
797 | ||
798 | if (IS_ERR(mtd_class)) { | |
799 | printk(KERN_ERR "Error creating mtd class.\n"); | |
800 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); | |
3a7a8824 | 801 | return PTR_ERR(mtd_class); |
9bc7b387 TP |
802 | } |
803 | ||
804 | register_mtd_user(¬ifier); | |
1da177e4 LT |
805 | return 0; |
806 | } | |
807 | ||
808 | static void __exit cleanup_mtdchar(void) | |
809 | { | |
9bc7b387 TP |
810 | unregister_mtd_user(¬ifier); |
811 | class_destroy(mtd_class); | |
1da177e4 LT |
812 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
813 | } | |
814 | ||
815 | module_init(init_mtdchar); | |
816 | module_exit(cleanup_mtdchar); | |
817 | ||
818 | ||
819 | MODULE_LICENSE("GPL"); | |
820 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
821 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); |