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Commit | Line | Data |
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1da177e4 | 1 | /* |
97894cda | 2 | * $Id: mtdchar.c,v 1.76 2005/11/07 11:14:20 gleixner Exp $ |
1da177e4 LT |
3 | * |
4 | * Character-device access to raw MTD devices. | |
5 | * | |
6 | */ | |
7 | ||
15fdc52f TG |
8 | #include <linux/device.h> |
9 | #include <linux/fs.h> | |
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 | ||
53f46542 | 28 | class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), |
9bc7b387 | 29 | NULL, "mtd%d", mtd->index); |
97894cda | 30 | |
53f46542 | 31 | class_device_create(mtd_class, NULL, |
9bc7b387 TP |
32 | MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), |
33 | NULL, "mtd%dro", mtd->index); | |
1da177e4 LT |
34 | } |
35 | ||
36 | static void mtd_notify_remove(struct mtd_info* mtd) | |
37 | { | |
38 | if (!mtd) | |
39 | return; | |
9bc7b387 TP |
40 | |
41 | class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2)); | |
42 | class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1)); | |
1da177e4 LT |
43 | } |
44 | ||
45 | static struct mtd_notifier notifier = { | |
46 | .add = mtd_notify_add, | |
47 | .remove = mtd_notify_remove, | |
48 | }; | |
49 | ||
045e9a5d | 50 | /* |
f1a28c02 TG |
51 | * Data structure to hold the pointer to the mtd device as well |
52 | * as mode information ofr various use cases. | |
045e9a5d | 53 | */ |
f1a28c02 TG |
54 | struct mtd_file_info { |
55 | struct mtd_info *mtd; | |
56 | enum mtd_file_modes mode; | |
57 | }; | |
31f4233b | 58 | |
1da177e4 LT |
59 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
60 | { | |
f1a28c02 TG |
61 | struct mtd_file_info *mfi = file->private_data; |
62 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
63 | |
64 | switch (orig) { | |
65 | case 0: | |
66 | /* SEEK_SET */ | |
1da177e4 LT |
67 | break; |
68 | case 1: | |
69 | /* SEEK_CUR */ | |
8b491d75 | 70 | offset += file->f_pos; |
1da177e4 LT |
71 | break; |
72 | case 2: | |
73 | /* SEEK_END */ | |
8b491d75 | 74 | offset += mtd->size; |
1da177e4 LT |
75 | break; |
76 | default: | |
77 | return -EINVAL; | |
78 | } | |
79 | ||
1887f517 | 80 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 81 | return file->f_pos = offset; |
1da177e4 | 82 | |
8b491d75 | 83 | return -EINVAL; |
1da177e4 LT |
84 | } |
85 | ||
86 | ||
87 | ||
88 | static int mtd_open(struct inode *inode, struct file *file) | |
89 | { | |
90 | int minor = iminor(inode); | |
91 | int devnum = minor >> 1; | |
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 | ||
104 | mtd = get_mtd_device(NULL, devnum); | |
97894cda | 105 | |
1da177e4 LT |
106 | if (!mtd) |
107 | return -ENODEV; | |
97894cda | 108 | |
1da177e4 LT |
109 | if (MTD_ABSENT == mtd->type) { |
110 | put_mtd_device(mtd); | |
111 | return -ENODEV; | |
112 | } | |
113 | ||
1da177e4 LT |
114 | /* You can't open it RW if it's not a writeable device */ |
115 | if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { | |
116 | put_mtd_device(mtd); | |
117 | return -EACCES; | |
118 | } | |
97894cda | 119 | |
f1a28c02 TG |
120 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
121 | if (!mfi) { | |
122 | put_mtd_device(mtd); | |
123 | return -ENOMEM; | |
124 | } | |
125 | mfi->mtd = mtd; | |
126 | file->private_data = mfi; | |
127 | ||
1da177e4 LT |
128 | return 0; |
129 | } /* mtd_open */ | |
130 | ||
131 | /*====================================================================*/ | |
132 | ||
133 | static int mtd_close(struct inode *inode, struct file *file) | |
134 | { | |
f1a28c02 TG |
135 | struct mtd_file_info *mfi = file->private_data; |
136 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
137 | |
138 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
139 | ||
1da177e4 LT |
140 | if (mtd->sync) |
141 | mtd->sync(mtd); | |
97894cda | 142 | |
1da177e4 | 143 | put_mtd_device(mtd); |
f1a28c02 TG |
144 | file->private_data = NULL; |
145 | kfree(mfi); | |
1da177e4 LT |
146 | |
147 | return 0; | |
148 | } /* mtd_close */ | |
149 | ||
150 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
151 | userspace buffer down and use it directly with readv/writev. | |
152 | */ | |
153 | #define MAX_KMALLOC_SIZE 0x20000 | |
154 | ||
155 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
156 | { | |
f1a28c02 TG |
157 | struct mtd_file_info *mfi = file->private_data; |
158 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
159 | size_t retlen=0; |
160 | size_t total_retlen=0; | |
161 | int ret=0; | |
162 | int len; | |
163 | char *kbuf; | |
97894cda | 164 | |
1da177e4 LT |
165 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
166 | ||
167 | if (*ppos + count > mtd->size) | |
168 | count = mtd->size - *ppos; | |
169 | ||
170 | if (!count) | |
171 | return 0; | |
97894cda | 172 | |
1da177e4 LT |
173 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers |
174 | and pass them directly to the MTD functions */ | |
b802c074 TG |
175 | |
176 | if (count > MAX_KMALLOC_SIZE) | |
177 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
178 | else | |
179 | kbuf=kmalloc(count, GFP_KERNEL); | |
180 | ||
181 | if (!kbuf) | |
182 | return -ENOMEM; | |
183 | ||
1da177e4 | 184 | while (count) { |
b802c074 | 185 | |
97894cda | 186 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
187 | len = MAX_KMALLOC_SIZE; |
188 | else | |
189 | len = count; | |
190 | ||
f1a28c02 TG |
191 | switch (mfi->mode) { |
192 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
193 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
194 | break; | |
195 | case MTD_MODE_OTP_USER: | |
196 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
197 | break; | |
f1a28c02 TG |
198 | case MTD_MODE_RAW: |
199 | { | |
200 | struct mtd_oob_ops ops; | |
201 | ||
202 | ops.mode = MTD_OOB_RAW; | |
203 | ops.datbuf = kbuf; | |
204 | ops.oobbuf = NULL; | |
205 | ops.len = len; | |
206 | ||
207 | ret = mtd->read_oob(mtd, *ppos, &ops); | |
208 | retlen = ops.retlen; | |
209 | break; | |
210 | } | |
31f4233b | 211 | default: |
f4a43cfc | 212 | ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 213 | } |
1da177e4 LT |
214 | /* Nand returns -EBADMSG on ecc errors, but it returns |
215 | * the data. For our userspace tools it is important | |
97894cda | 216 | * to dump areas with ecc errors ! |
9a1fcdfd TG |
217 | * For kernel internal usage it also might return -EUCLEAN |
218 | * to signal the caller that a bitflip has occured and has | |
219 | * been corrected by the ECC algorithm. | |
1da177e4 LT |
220 | * Userspace software which accesses NAND this way |
221 | * must be aware of the fact that it deals with NAND | |
222 | */ | |
9a1fcdfd | 223 | if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { |
1da177e4 LT |
224 | *ppos += retlen; |
225 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 226 | kfree(kbuf); |
1da177e4 LT |
227 | return -EFAULT; |
228 | } | |
229 | else | |
230 | total_retlen += retlen; | |
231 | ||
232 | count -= retlen; | |
233 | buf += retlen; | |
31f4233b NP |
234 | if (retlen == 0) |
235 | count = 0; | |
1da177e4 LT |
236 | } |
237 | else { | |
238 | kfree(kbuf); | |
239 | return ret; | |
240 | } | |
97894cda | 241 | |
1da177e4 LT |
242 | } |
243 | ||
b802c074 | 244 | kfree(kbuf); |
1da177e4 LT |
245 | return total_retlen; |
246 | } /* mtd_read */ | |
247 | ||
248 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
249 | { | |
f1a28c02 TG |
250 | struct mtd_file_info *mfi = file->private_data; |
251 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
252 | char *kbuf; |
253 | size_t retlen; | |
254 | size_t total_retlen=0; | |
255 | int ret=0; | |
256 | int len; | |
257 | ||
258 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 259 | |
1da177e4 LT |
260 | if (*ppos == mtd->size) |
261 | return -ENOSPC; | |
97894cda | 262 | |
1da177e4 LT |
263 | if (*ppos + count > mtd->size) |
264 | count = mtd->size - *ppos; | |
265 | ||
266 | if (!count) | |
267 | return 0; | |
268 | ||
b802c074 TG |
269 | if (count > MAX_KMALLOC_SIZE) |
270 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
271 | else | |
272 | kbuf=kmalloc(count, GFP_KERNEL); | |
273 | ||
274 | if (!kbuf) | |
275 | return -ENOMEM; | |
276 | ||
1da177e4 | 277 | while (count) { |
b802c074 | 278 | |
97894cda | 279 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
280 | len = MAX_KMALLOC_SIZE; |
281 | else | |
282 | len = count; | |
283 | ||
1da177e4 LT |
284 | if (copy_from_user(kbuf, buf, len)) { |
285 | kfree(kbuf); | |
286 | return -EFAULT; | |
287 | } | |
97894cda | 288 | |
f1a28c02 TG |
289 | switch (mfi->mode) { |
290 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
291 | ret = -EROFS; |
292 | break; | |
293 | case MTD_MODE_OTP_USER: | |
294 | if (!mtd->write_user_prot_reg) { | |
295 | ret = -EOPNOTSUPP; | |
296 | break; | |
297 | } | |
298 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
299 | break; | |
f1a28c02 TG |
300 | |
301 | case MTD_MODE_RAW: | |
302 | { | |
303 | struct mtd_oob_ops ops; | |
304 | ||
305 | ops.mode = MTD_OOB_RAW; | |
306 | ops.datbuf = kbuf; | |
307 | ops.oobbuf = NULL; | |
308 | ops.len = len; | |
309 | ||
310 | ret = mtd->write_oob(mtd, *ppos, &ops); | |
311 | retlen = ops.retlen; | |
312 | break; | |
313 | } | |
314 | ||
31f4233b NP |
315 | default: |
316 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
317 | } | |
1da177e4 LT |
318 | if (!ret) { |
319 | *ppos += retlen; | |
320 | total_retlen += retlen; | |
321 | count -= retlen; | |
322 | buf += retlen; | |
323 | } | |
324 | else { | |
325 | kfree(kbuf); | |
326 | return ret; | |
327 | } | |
1da177e4 LT |
328 | } |
329 | ||
b802c074 | 330 | kfree(kbuf); |
1da177e4 LT |
331 | return total_retlen; |
332 | } /* mtd_write */ | |
333 | ||
334 | /*====================================================================== | |
335 | ||
336 | IOCTL calls for getting device parameters. | |
337 | ||
338 | ======================================================================*/ | |
339 | static void mtdchar_erase_callback (struct erase_info *instr) | |
340 | { | |
341 | wake_up((wait_queue_head_t *)instr->priv); | |
342 | } | |
343 | ||
f1a28c02 TG |
344 | #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) |
345 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) | |
346 | { | |
347 | struct mtd_info *mtd = mfi->mtd; | |
348 | int ret = 0; | |
349 | ||
350 | switch (mode) { | |
351 | case MTD_OTP_FACTORY: | |
352 | if (!mtd->read_fact_prot_reg) | |
353 | ret = -EOPNOTSUPP; | |
354 | else | |
355 | mfi->mode = MTD_MODE_OTP_FACTORY; | |
356 | break; | |
357 | case MTD_OTP_USER: | |
358 | if (!mtd->read_fact_prot_reg) | |
359 | ret = -EOPNOTSUPP; | |
360 | else | |
361 | mfi->mode = MTD_MODE_OTP_USER; | |
362 | break; | |
363 | default: | |
364 | ret = -EINVAL; | |
365 | case MTD_OTP_OFF: | |
366 | break; | |
367 | } | |
368 | return ret; | |
369 | } | |
370 | #else | |
371 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
372 | #endif | |
373 | ||
1da177e4 LT |
374 | static int mtd_ioctl(struct inode *inode, struct file *file, |
375 | u_int cmd, u_long arg) | |
376 | { | |
f1a28c02 TG |
377 | struct mtd_file_info *mfi = file->private_data; |
378 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
379 | void __user *argp = (void __user *)arg; |
380 | int ret = 0; | |
381 | u_long size; | |
73c619ea | 382 | struct mtd_info_user info; |
97894cda | 383 | |
1da177e4 LT |
384 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
385 | ||
386 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
387 | if (cmd & IOC_IN) { | |
388 | if (!access_ok(VERIFY_READ, argp, size)) | |
389 | return -EFAULT; | |
390 | } | |
391 | if (cmd & IOC_OUT) { | |
392 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
393 | return -EFAULT; | |
394 | } | |
97894cda | 395 | |
1da177e4 LT |
396 | switch (cmd) { |
397 | case MEMGETREGIONCOUNT: | |
398 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
399 | return -EFAULT; | |
400 | break; | |
401 | ||
402 | case MEMGETREGIONINFO: | |
403 | { | |
404 | struct region_info_user ur; | |
405 | ||
406 | if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) | |
407 | return -EFAULT; | |
408 | ||
409 | if (ur.regionindex >= mtd->numeraseregions) | |
410 | return -EINVAL; | |
411 | if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), | |
412 | sizeof(struct mtd_erase_region_info))) | |
413 | return -EFAULT; | |
414 | break; | |
415 | } | |
416 | ||
417 | case MEMGETINFO: | |
73c619ea JE |
418 | info.type = mtd->type; |
419 | info.flags = mtd->flags; | |
420 | info.size = mtd->size; | |
421 | info.erasesize = mtd->erasesize; | |
422 | info.writesize = mtd->writesize; | |
423 | info.oobsize = mtd->oobsize; | |
424 | info.ecctype = mtd->ecctype; | |
425 | info.eccsize = mtd->eccsize; | |
426 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) | |
1da177e4 LT |
427 | return -EFAULT; |
428 | break; | |
429 | ||
430 | case MEMERASE: | |
431 | { | |
432 | struct erase_info *erase; | |
433 | ||
434 | if(!(file->f_mode & 2)) | |
435 | return -EPERM; | |
436 | ||
437 | erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL); | |
438 | if (!erase) | |
439 | ret = -ENOMEM; | |
440 | else { | |
441 | wait_queue_head_t waitq; | |
442 | DECLARE_WAITQUEUE(wait, current); | |
443 | ||
444 | init_waitqueue_head(&waitq); | |
445 | ||
446 | memset (erase,0,sizeof(struct erase_info)); | |
447 | if (copy_from_user(&erase->addr, argp, | |
448 | sizeof(struct erase_info_user))) { | |
449 | kfree(erase); | |
450 | return -EFAULT; | |
451 | } | |
452 | erase->mtd = mtd; | |
453 | erase->callback = mtdchar_erase_callback; | |
454 | erase->priv = (unsigned long)&waitq; | |
97894cda | 455 | |
1da177e4 LT |
456 | /* |
457 | FIXME: Allow INTERRUPTIBLE. Which means | |
458 | not having the wait_queue head on the stack. | |
97894cda | 459 | |
1da177e4 LT |
460 | If the wq_head is on the stack, and we |
461 | leave because we got interrupted, then the | |
462 | wq_head is no longer there when the | |
463 | callback routine tries to wake us up. | |
464 | */ | |
465 | ret = mtd->erase(mtd, erase); | |
466 | if (!ret) { | |
467 | set_current_state(TASK_UNINTERRUPTIBLE); | |
468 | add_wait_queue(&waitq, &wait); | |
469 | if (erase->state != MTD_ERASE_DONE && | |
470 | erase->state != MTD_ERASE_FAILED) | |
471 | schedule(); | |
472 | remove_wait_queue(&waitq, &wait); | |
473 | set_current_state(TASK_RUNNING); | |
474 | ||
475 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
476 | } | |
477 | kfree(erase); | |
478 | } | |
479 | break; | |
480 | } | |
481 | ||
482 | case MEMWRITEOOB: | |
483 | { | |
484 | struct mtd_oob_buf buf; | |
8593fbc6 | 485 | struct mtd_oob_ops ops; |
97894cda | 486 | |
1da177e4 LT |
487 | if(!(file->f_mode & 2)) |
488 | return -EPERM; | |
489 | ||
490 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
491 | return -EFAULT; | |
97894cda | 492 | |
8593fbc6 | 493 | if (buf.length > 4096) |
1da177e4 LT |
494 | return -EINVAL; |
495 | ||
496 | if (!mtd->write_oob) | |
497 | ret = -EOPNOTSUPP; | |
498 | else | |
499 | ret = access_ok(VERIFY_READ, buf.ptr, | |
500 | buf.length) ? 0 : EFAULT; | |
501 | ||
502 | if (ret) | |
503 | return ret; | |
504 | ||
8593fbc6 | 505 | ops.len = buf.length; |
7bc3312b | 506 | ops.ooblen = buf.length; |
8593fbc6 TG |
507 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
508 | ops.datbuf = NULL; | |
509 | ops.mode = MTD_OOB_PLACE; | |
510 | ||
7bc3312b | 511 | if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
512 | return -EINVAL; |
513 | ||
514 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
515 | if (!ops.oobbuf) | |
1da177e4 | 516 | return -ENOMEM; |
97894cda | 517 | |
8593fbc6 TG |
518 | if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) { |
519 | kfree(ops.oobbuf); | |
1da177e4 LT |
520 | return -EFAULT; |
521 | } | |
522 | ||
8593fbc6 TG |
523 | buf.start &= ~(mtd->oobsize - 1); |
524 | ret = mtd->write_oob(mtd, buf.start, &ops); | |
1da177e4 | 525 | |
8593fbc6 TG |
526 | if (copy_to_user(argp + sizeof(uint32_t), &ops.retlen, |
527 | sizeof(uint32_t))) | |
1da177e4 LT |
528 | ret = -EFAULT; |
529 | ||
8593fbc6 | 530 | kfree(ops.oobbuf); |
1da177e4 LT |
531 | break; |
532 | ||
533 | } | |
534 | ||
535 | case MEMREADOOB: | |
536 | { | |
537 | struct mtd_oob_buf buf; | |
8593fbc6 | 538 | struct mtd_oob_ops ops; |
1da177e4 LT |
539 | |
540 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
541 | return -EFAULT; | |
97894cda | 542 | |
8593fbc6 | 543 | if (buf.length > 4096) |
1da177e4 LT |
544 | return -EINVAL; |
545 | ||
546 | if (!mtd->read_oob) | |
547 | ret = -EOPNOTSUPP; | |
548 | else | |
549 | ret = access_ok(VERIFY_WRITE, buf.ptr, | |
550 | buf.length) ? 0 : -EFAULT; | |
1da177e4 LT |
551 | if (ret) |
552 | return ret; | |
553 | ||
8593fbc6 | 554 | ops.len = buf.length; |
7bc3312b | 555 | ops.ooblen = buf.length; |
8593fbc6 TG |
556 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
557 | ops.datbuf = NULL; | |
558 | ops.mode = MTD_OOB_PLACE; | |
559 | ||
7bc3312b | 560 | if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
561 | return -EINVAL; |
562 | ||
563 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
564 | if (!ops.oobbuf) | |
1da177e4 | 565 | return -ENOMEM; |
97894cda | 566 | |
8593fbc6 TG |
567 | buf.start &= ~(mtd->oobsize - 1); |
568 | ret = mtd->read_oob(mtd, buf.start, &ops); | |
1da177e4 | 569 | |
8593fbc6 | 570 | if (put_user(ops.retlen, (uint32_t __user *)argp)) |
1da177e4 | 571 | ret = -EFAULT; |
8593fbc6 TG |
572 | else if (ops.retlen && copy_to_user(buf.ptr, ops.oobbuf, |
573 | ops.retlen)) | |
1da177e4 | 574 | ret = -EFAULT; |
97894cda | 575 | |
8593fbc6 | 576 | kfree(ops.oobbuf); |
1da177e4 LT |
577 | break; |
578 | } | |
579 | ||
580 | case MEMLOCK: | |
581 | { | |
582 | struct erase_info_user info; | |
583 | ||
584 | if (copy_from_user(&info, argp, sizeof(info))) | |
585 | return -EFAULT; | |
586 | ||
587 | if (!mtd->lock) | |
588 | ret = -EOPNOTSUPP; | |
589 | else | |
590 | ret = mtd->lock(mtd, info.start, info.length); | |
591 | break; | |
592 | } | |
593 | ||
594 | case MEMUNLOCK: | |
595 | { | |
596 | struct erase_info_user info; | |
597 | ||
598 | if (copy_from_user(&info, argp, sizeof(info))) | |
599 | return -EFAULT; | |
600 | ||
601 | if (!mtd->unlock) | |
602 | ret = -EOPNOTSUPP; | |
603 | else | |
604 | ret = mtd->unlock(mtd, info.start, info.length); | |
605 | break; | |
606 | } | |
607 | ||
5bd34c09 | 608 | /* Legacy interface */ |
1da177e4 LT |
609 | case MEMGETOOBSEL: |
610 | { | |
5bd34c09 TG |
611 | struct nand_oobinfo oi; |
612 | ||
613 | if (!mtd->ecclayout) | |
614 | return -EOPNOTSUPP; | |
615 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
616 | return -EINVAL; | |
617 | ||
618 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
619 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
620 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
621 | sizeof(oi.oobfree)); | |
622 | ||
623 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
624 | return -EFAULT; |
625 | break; | |
626 | } | |
627 | ||
628 | case MEMGETBADBLOCK: | |
629 | { | |
630 | loff_t offs; | |
97894cda | 631 | |
1da177e4 LT |
632 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
633 | return -EFAULT; | |
634 | if (!mtd->block_isbad) | |
635 | ret = -EOPNOTSUPP; | |
636 | else | |
637 | return mtd->block_isbad(mtd, offs); | |
638 | break; | |
639 | } | |
640 | ||
641 | case MEMSETBADBLOCK: | |
642 | { | |
643 | loff_t offs; | |
644 | ||
645 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
646 | return -EFAULT; | |
647 | if (!mtd->block_markbad) | |
648 | ret = -EOPNOTSUPP; | |
649 | else | |
650 | return mtd->block_markbad(mtd, offs); | |
651 | break; | |
652 | } | |
653 | ||
493c6460 | 654 | #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) |
31f4233b NP |
655 | case OTPSELECT: |
656 | { | |
657 | int mode; | |
658 | if (copy_from_user(&mode, argp, sizeof(int))) | |
659 | return -EFAULT; | |
f1a28c02 TG |
660 | |
661 | mfi->mode = MTD_MODE_NORMAL; | |
662 | ||
663 | ret = otp_select_filemode(mfi, mode); | |
664 | ||
81dba488 | 665 | file->f_pos = 0; |
31f4233b NP |
666 | break; |
667 | } | |
668 | ||
669 | case OTPGETREGIONCOUNT: | |
670 | case OTPGETREGIONINFO: | |
671 | { | |
672 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
673 | if (!buf) | |
674 | return -ENOMEM; | |
675 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
676 | switch (mfi->mode) { |
677 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
678 | if (mtd->get_fact_prot_info) |
679 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
680 | break; | |
681 | case MTD_MODE_OTP_USER: | |
682 | if (mtd->get_user_prot_info) | |
683 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
684 | break; | |
f1a28c02 TG |
685 | default: |
686 | break; | |
31f4233b NP |
687 | } |
688 | if (ret >= 0) { | |
689 | if (cmd == OTPGETREGIONCOUNT) { | |
690 | int nbr = ret / sizeof(struct otp_info); | |
691 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
692 | } else | |
693 | ret = copy_to_user(argp, buf, ret); | |
694 | if (ret) | |
695 | ret = -EFAULT; | |
696 | } | |
697 | kfree(buf); | |
698 | break; | |
699 | } | |
700 | ||
701 | case OTPLOCK: | |
702 | { | |
703 | struct otp_info info; | |
704 | ||
f1a28c02 | 705 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b NP |
706 | return -EINVAL; |
707 | if (copy_from_user(&info, argp, sizeof(info))) | |
708 | return -EFAULT; | |
709 | if (!mtd->lock_user_prot_reg) | |
710 | return -EOPNOTSUPP; | |
711 | ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); | |
712 | break; | |
713 | } | |
714 | #endif | |
715 | ||
f1a28c02 TG |
716 | case ECCGETLAYOUT: |
717 | { | |
718 | if (!mtd->ecclayout) | |
719 | return -EOPNOTSUPP; | |
720 | ||
721 | if (copy_to_user(argp, &mtd->ecclayout, | |
722 | sizeof(struct nand_ecclayout))) | |
723 | return -EFAULT; | |
724 | break; | |
725 | } | |
726 | ||
727 | case ECCGETSTATS: | |
728 | { | |
729 | if (copy_to_user(argp, &mtd->ecc_stats, | |
730 | sizeof(struct mtd_ecc_stats))) | |
731 | return -EFAULT; | |
732 | break; | |
733 | } | |
734 | ||
735 | case MTDFILEMODE: | |
736 | { | |
737 | mfi->mode = 0; | |
738 | ||
739 | switch(arg) { | |
740 | case MTD_MODE_OTP_FACTORY: | |
741 | case MTD_MODE_OTP_USER: | |
742 | ret = otp_select_filemode(mfi, arg); | |
743 | break; | |
744 | ||
745 | case MTD_MODE_RAW: | |
746 | if (!mtd->read_oob || !mtd->write_oob) | |
747 | return -EOPNOTSUPP; | |
748 | mfi->mode = arg; | |
749 | ||
750 | case MTD_MODE_NORMAL: | |
751 | break; | |
752 | default: | |
753 | ret = -EINVAL; | |
754 | } | |
755 | file->f_pos = 0; | |
756 | break; | |
757 | } | |
758 | ||
1da177e4 LT |
759 | default: |
760 | ret = -ENOTTY; | |
761 | } | |
762 | ||
763 | return ret; | |
764 | } /* memory_ioctl */ | |
765 | ||
766 | static struct file_operations mtd_fops = { | |
767 | .owner = THIS_MODULE, | |
768 | .llseek = mtd_lseek, | |
769 | .read = mtd_read, | |
770 | .write = mtd_write, | |
771 | .ioctl = mtd_ioctl, | |
772 | .open = mtd_open, | |
773 | .release = mtd_close, | |
774 | }; | |
775 | ||
776 | static int __init init_mtdchar(void) | |
777 | { | |
778 | if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { | |
779 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", | |
780 | MTD_CHAR_MAJOR); | |
781 | return -EAGAIN; | |
782 | } | |
783 | ||
9bc7b387 TP |
784 | mtd_class = class_create(THIS_MODULE, "mtd"); |
785 | ||
786 | if (IS_ERR(mtd_class)) { | |
787 | printk(KERN_ERR "Error creating mtd class.\n"); | |
788 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); | |
3a7a8824 | 789 | return PTR_ERR(mtd_class); |
9bc7b387 TP |
790 | } |
791 | ||
792 | register_mtd_user(¬ifier); | |
1da177e4 LT |
793 | return 0; |
794 | } | |
795 | ||
796 | static void __exit cleanup_mtdchar(void) | |
797 | { | |
9bc7b387 TP |
798 | unregister_mtd_user(¬ifier); |
799 | class_destroy(mtd_class); | |
1da177e4 LT |
800 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
801 | } | |
802 | ||
803 | module_init(init_mtdchar); | |
804 | module_exit(cleanup_mtdchar); | |
805 | ||
806 | ||
807 | MODULE_LICENSE("GPL"); | |
808 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
809 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); |