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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 | ||
8 | #include <linux/config.h> | |
15fdc52f TG |
9 | #include <linux/device.h> |
10 | #include <linux/fs.h> | |
11 | #include <linux/init.h> | |
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> | |
15fdc52f TG |
14 | #include <linux/slab.h> |
15 | #include <linux/sched.h> | |
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 | ||
53f46542 | 29 | class_device_create(mtd_class, NULL, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), |
9bc7b387 | 30 | NULL, "mtd%d", mtd->index); |
97894cda | 31 | |
53f46542 | 32 | class_device_create(mtd_class, NULL, |
9bc7b387 TP |
33 | MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), |
34 | NULL, "mtd%dro", mtd->index); | |
1da177e4 LT |
35 | } |
36 | ||
37 | static void mtd_notify_remove(struct mtd_info* mtd) | |
38 | { | |
39 | if (!mtd) | |
40 | return; | |
9bc7b387 TP |
41 | |
42 | class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2)); | |
43 | class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1)); | |
1da177e4 LT |
44 | } |
45 | ||
46 | static struct mtd_notifier notifier = { | |
47 | .add = mtd_notify_add, | |
48 | .remove = mtd_notify_remove, | |
49 | }; | |
50 | ||
045e9a5d NP |
51 | /* |
52 | * We use file->private_data to store a pointer to the MTDdevice. | |
53 | * Since alighment is at least 32 bits, we have 2 bits free for OTP | |
54 | * modes as well. | |
55 | */ | |
56 | ||
57 | #define TO_MTD(file) (struct mtd_info *)((long)((file)->private_data) & ~3L) | |
31f4233b | 58 | |
045e9a5d NP |
59 | #define MTD_MODE_OTP_FACT 1 |
60 | #define MTD_MODE_OTP_USER 2 | |
61 | #define MTD_MODE(file) ((long)((file)->private_data) & 3) | |
62 | ||
63 | #define SET_MTD_MODE(file, mode) \ | |
64 | do { long __p = (long)((file)->private_data); \ | |
65 | (file)->private_data = (void *)((__p & ~3L) | mode); } while (0) | |
31f4233b | 66 | |
1da177e4 LT |
67 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
68 | { | |
045e9a5d | 69 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
70 | |
71 | switch (orig) { | |
72 | case 0: | |
73 | /* SEEK_SET */ | |
1da177e4 LT |
74 | break; |
75 | case 1: | |
76 | /* SEEK_CUR */ | |
8b491d75 | 77 | offset += file->f_pos; |
1da177e4 LT |
78 | break; |
79 | case 2: | |
80 | /* SEEK_END */ | |
8b491d75 | 81 | offset += mtd->size; |
1da177e4 LT |
82 | break; |
83 | default: | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
8b491d75 TP |
87 | if (offset >= 0 && offset < mtd->size) |
88 | return file->f_pos = offset; | |
1da177e4 | 89 | |
8b491d75 | 90 | return -EINVAL; |
1da177e4 LT |
91 | } |
92 | ||
93 | ||
94 | ||
95 | static int mtd_open(struct inode *inode, struct file *file) | |
96 | { | |
97 | int minor = iminor(inode); | |
98 | int devnum = minor >> 1; | |
99 | struct mtd_info *mtd; | |
100 | ||
101 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
102 | ||
103 | if (devnum >= MAX_MTD_DEVICES) | |
104 | return -ENODEV; | |
105 | ||
106 | /* You can't open the RO devices RW */ | |
107 | if ((file->f_mode & 2) && (minor & 1)) | |
108 | return -EACCES; | |
109 | ||
110 | mtd = get_mtd_device(NULL, devnum); | |
97894cda | 111 | |
1da177e4 LT |
112 | if (!mtd) |
113 | return -ENODEV; | |
97894cda | 114 | |
1da177e4 LT |
115 | if (MTD_ABSENT == mtd->type) { |
116 | put_mtd_device(mtd); | |
117 | return -ENODEV; | |
118 | } | |
119 | ||
120 | file->private_data = mtd; | |
97894cda | 121 | |
1da177e4 LT |
122 | /* You can't open it RW if it's not a writeable device */ |
123 | if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { | |
124 | put_mtd_device(mtd); | |
125 | return -EACCES; | |
126 | } | |
97894cda | 127 | |
1da177e4 LT |
128 | return 0; |
129 | } /* mtd_open */ | |
130 | ||
131 | /*====================================================================*/ | |
132 | ||
133 | static int mtd_close(struct inode *inode, struct file *file) | |
134 | { | |
135 | struct mtd_info *mtd; | |
136 | ||
137 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
138 | ||
045e9a5d | 139 | mtd = TO_MTD(file); |
97894cda | 140 | |
1da177e4 LT |
141 | if (mtd->sync) |
142 | mtd->sync(mtd); | |
97894cda | 143 | |
1da177e4 LT |
144 | put_mtd_device(mtd); |
145 | ||
146 | return 0; | |
147 | } /* mtd_close */ | |
148 | ||
149 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
150 | userspace buffer down and use it directly with readv/writev. | |
151 | */ | |
152 | #define MAX_KMALLOC_SIZE 0x20000 | |
153 | ||
154 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
155 | { | |
045e9a5d | 156 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
157 | size_t retlen=0; |
158 | size_t total_retlen=0; | |
159 | int ret=0; | |
160 | int len; | |
161 | char *kbuf; | |
97894cda | 162 | |
1da177e4 LT |
163 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
164 | ||
165 | if (*ppos + count > mtd->size) | |
166 | count = mtd->size - *ppos; | |
167 | ||
168 | if (!count) | |
169 | return 0; | |
97894cda | 170 | |
1da177e4 LT |
171 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers |
172 | and pass them directly to the MTD functions */ | |
b802c074 TG |
173 | |
174 | if (count > MAX_KMALLOC_SIZE) | |
175 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
176 | else | |
177 | kbuf=kmalloc(count, GFP_KERNEL); | |
178 | ||
179 | if (!kbuf) | |
180 | return -ENOMEM; | |
181 | ||
1da177e4 | 182 | while (count) { |
b802c074 | 183 | |
97894cda | 184 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
185 | len = MAX_KMALLOC_SIZE; |
186 | else | |
187 | len = count; | |
188 | ||
045e9a5d | 189 | switch (MTD_MODE(file)) { |
31f4233b NP |
190 | case MTD_MODE_OTP_FACT: |
191 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
192 | break; | |
193 | case MTD_MODE_OTP_USER: | |
194 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
195 | break; | |
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 ! |
1da177e4 LT |
202 | * Userspace software which accesses NAND this way |
203 | * must be aware of the fact that it deals with NAND | |
204 | */ | |
205 | if (!ret || (ret == -EBADMSG)) { | |
206 | *ppos += retlen; | |
207 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 208 | kfree(kbuf); |
1da177e4 LT |
209 | return -EFAULT; |
210 | } | |
211 | else | |
212 | total_retlen += retlen; | |
213 | ||
214 | count -= retlen; | |
215 | buf += retlen; | |
31f4233b NP |
216 | if (retlen == 0) |
217 | count = 0; | |
1da177e4 LT |
218 | } |
219 | else { | |
220 | kfree(kbuf); | |
221 | return ret; | |
222 | } | |
97894cda | 223 | |
1da177e4 LT |
224 | } |
225 | ||
b802c074 | 226 | kfree(kbuf); |
1da177e4 LT |
227 | return total_retlen; |
228 | } /* mtd_read */ | |
229 | ||
230 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
231 | { | |
045e9a5d | 232 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
233 | char *kbuf; |
234 | size_t retlen; | |
235 | size_t total_retlen=0; | |
236 | int ret=0; | |
237 | int len; | |
238 | ||
239 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 240 | |
1da177e4 LT |
241 | if (*ppos == mtd->size) |
242 | return -ENOSPC; | |
97894cda | 243 | |
1da177e4 LT |
244 | if (*ppos + count > mtd->size) |
245 | count = mtd->size - *ppos; | |
246 | ||
247 | if (!count) | |
248 | return 0; | |
249 | ||
b802c074 TG |
250 | if (count > MAX_KMALLOC_SIZE) |
251 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
252 | else | |
253 | kbuf=kmalloc(count, GFP_KERNEL); | |
254 | ||
255 | if (!kbuf) | |
256 | return -ENOMEM; | |
257 | ||
1da177e4 | 258 | while (count) { |
b802c074 | 259 | |
97894cda | 260 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
261 | len = MAX_KMALLOC_SIZE; |
262 | else | |
263 | len = count; | |
264 | ||
1da177e4 LT |
265 | if (copy_from_user(kbuf, buf, len)) { |
266 | kfree(kbuf); | |
267 | return -EFAULT; | |
268 | } | |
97894cda | 269 | |
045e9a5d | 270 | switch (MTD_MODE(file)) { |
31f4233b NP |
271 | case MTD_MODE_OTP_FACT: |
272 | ret = -EROFS; | |
273 | break; | |
274 | case MTD_MODE_OTP_USER: | |
275 | if (!mtd->write_user_prot_reg) { | |
276 | ret = -EOPNOTSUPP; | |
277 | break; | |
278 | } | |
279 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
280 | break; | |
281 | default: | |
282 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
283 | } | |
1da177e4 LT |
284 | if (!ret) { |
285 | *ppos += retlen; | |
286 | total_retlen += retlen; | |
287 | count -= retlen; | |
288 | buf += retlen; | |
289 | } | |
290 | else { | |
291 | kfree(kbuf); | |
292 | return ret; | |
293 | } | |
1da177e4 LT |
294 | } |
295 | ||
b802c074 | 296 | kfree(kbuf); |
1da177e4 LT |
297 | return total_retlen; |
298 | } /* mtd_write */ | |
299 | ||
300 | /*====================================================================== | |
301 | ||
302 | IOCTL calls for getting device parameters. | |
303 | ||
304 | ======================================================================*/ | |
305 | static void mtdchar_erase_callback (struct erase_info *instr) | |
306 | { | |
307 | wake_up((wait_queue_head_t *)instr->priv); | |
308 | } | |
309 | ||
310 | static int mtd_ioctl(struct inode *inode, struct file *file, | |
311 | u_int cmd, u_long arg) | |
312 | { | |
045e9a5d | 313 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
314 | void __user *argp = (void __user *)arg; |
315 | int ret = 0; | |
316 | u_long size; | |
97894cda | 317 | |
1da177e4 LT |
318 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
319 | ||
320 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
321 | if (cmd & IOC_IN) { | |
322 | if (!access_ok(VERIFY_READ, argp, size)) | |
323 | return -EFAULT; | |
324 | } | |
325 | if (cmd & IOC_OUT) { | |
326 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
327 | return -EFAULT; | |
328 | } | |
97894cda | 329 | |
1da177e4 LT |
330 | switch (cmd) { |
331 | case MEMGETREGIONCOUNT: | |
332 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
333 | return -EFAULT; | |
334 | break; | |
335 | ||
336 | case MEMGETREGIONINFO: | |
337 | { | |
338 | struct region_info_user ur; | |
339 | ||
340 | if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) | |
341 | return -EFAULT; | |
342 | ||
343 | if (ur.regionindex >= mtd->numeraseregions) | |
344 | return -EINVAL; | |
345 | if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), | |
346 | sizeof(struct mtd_erase_region_info))) | |
347 | return -EFAULT; | |
348 | break; | |
349 | } | |
350 | ||
351 | case MEMGETINFO: | |
352 | if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user))) | |
353 | return -EFAULT; | |
354 | break; | |
355 | ||
356 | case MEMERASE: | |
357 | { | |
358 | struct erase_info *erase; | |
359 | ||
360 | if(!(file->f_mode & 2)) | |
361 | return -EPERM; | |
362 | ||
363 | erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL); | |
364 | if (!erase) | |
365 | ret = -ENOMEM; | |
366 | else { | |
367 | wait_queue_head_t waitq; | |
368 | DECLARE_WAITQUEUE(wait, current); | |
369 | ||
370 | init_waitqueue_head(&waitq); | |
371 | ||
372 | memset (erase,0,sizeof(struct erase_info)); | |
373 | if (copy_from_user(&erase->addr, argp, | |
374 | sizeof(struct erase_info_user))) { | |
375 | kfree(erase); | |
376 | return -EFAULT; | |
377 | } | |
378 | erase->mtd = mtd; | |
379 | erase->callback = mtdchar_erase_callback; | |
380 | erase->priv = (unsigned long)&waitq; | |
97894cda | 381 | |
1da177e4 LT |
382 | /* |
383 | FIXME: Allow INTERRUPTIBLE. Which means | |
384 | not having the wait_queue head on the stack. | |
97894cda | 385 | |
1da177e4 LT |
386 | If the wq_head is on the stack, and we |
387 | leave because we got interrupted, then the | |
388 | wq_head is no longer there when the | |
389 | callback routine tries to wake us up. | |
390 | */ | |
391 | ret = mtd->erase(mtd, erase); | |
392 | if (!ret) { | |
393 | set_current_state(TASK_UNINTERRUPTIBLE); | |
394 | add_wait_queue(&waitq, &wait); | |
395 | if (erase->state != MTD_ERASE_DONE && | |
396 | erase->state != MTD_ERASE_FAILED) | |
397 | schedule(); | |
398 | remove_wait_queue(&waitq, &wait); | |
399 | set_current_state(TASK_RUNNING); | |
400 | ||
401 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
402 | } | |
403 | kfree(erase); | |
404 | } | |
405 | break; | |
406 | } | |
407 | ||
408 | case MEMWRITEOOB: | |
409 | { | |
410 | struct mtd_oob_buf buf; | |
411 | void *databuf; | |
412 | ssize_t retlen; | |
97894cda | 413 | |
1da177e4 LT |
414 | if(!(file->f_mode & 2)) |
415 | return -EPERM; | |
416 | ||
417 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
418 | return -EFAULT; | |
97894cda | 419 | |
1da177e4 LT |
420 | if (buf.length > 0x4096) |
421 | return -EINVAL; | |
422 | ||
423 | if (!mtd->write_oob) | |
424 | ret = -EOPNOTSUPP; | |
425 | else | |
426 | ret = access_ok(VERIFY_READ, buf.ptr, | |
427 | buf.length) ? 0 : EFAULT; | |
428 | ||
429 | if (ret) | |
430 | return ret; | |
431 | ||
432 | databuf = kmalloc(buf.length, GFP_KERNEL); | |
433 | if (!databuf) | |
434 | return -ENOMEM; | |
97894cda | 435 | |
1da177e4 LT |
436 | if (copy_from_user(databuf, buf.ptr, buf.length)) { |
437 | kfree(databuf); | |
438 | return -EFAULT; | |
439 | } | |
440 | ||
441 | ret = (mtd->write_oob)(mtd, buf.start, buf.length, &retlen, databuf); | |
442 | ||
443 | if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t))) | |
444 | ret = -EFAULT; | |
445 | ||
446 | kfree(databuf); | |
447 | break; | |
448 | ||
449 | } | |
450 | ||
451 | case MEMREADOOB: | |
452 | { | |
453 | struct mtd_oob_buf buf; | |
454 | void *databuf; | |
455 | ssize_t retlen; | |
456 | ||
457 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
458 | return -EFAULT; | |
97894cda | 459 | |
1da177e4 LT |
460 | if (buf.length > 0x4096) |
461 | return -EINVAL; | |
462 | ||
463 | if (!mtd->read_oob) | |
464 | ret = -EOPNOTSUPP; | |
465 | else | |
466 | ret = access_ok(VERIFY_WRITE, buf.ptr, | |
467 | buf.length) ? 0 : -EFAULT; | |
468 | ||
469 | if (ret) | |
470 | return ret; | |
471 | ||
472 | databuf = kmalloc(buf.length, GFP_KERNEL); | |
473 | if (!databuf) | |
474 | return -ENOMEM; | |
97894cda | 475 | |
1da177e4 LT |
476 | ret = (mtd->read_oob)(mtd, buf.start, buf.length, &retlen, databuf); |
477 | ||
478 | if (put_user(retlen, (uint32_t __user *)argp)) | |
479 | ret = -EFAULT; | |
480 | else if (retlen && copy_to_user(buf.ptr, databuf, retlen)) | |
481 | ret = -EFAULT; | |
97894cda | 482 | |
1da177e4 LT |
483 | kfree(databuf); |
484 | break; | |
485 | } | |
486 | ||
487 | case MEMLOCK: | |
488 | { | |
489 | struct erase_info_user info; | |
490 | ||
491 | if (copy_from_user(&info, argp, sizeof(info))) | |
492 | return -EFAULT; | |
493 | ||
494 | if (!mtd->lock) | |
495 | ret = -EOPNOTSUPP; | |
496 | else | |
497 | ret = mtd->lock(mtd, info.start, info.length); | |
498 | break; | |
499 | } | |
500 | ||
501 | case MEMUNLOCK: | |
502 | { | |
503 | struct erase_info_user info; | |
504 | ||
505 | if (copy_from_user(&info, argp, sizeof(info))) | |
506 | return -EFAULT; | |
507 | ||
508 | if (!mtd->unlock) | |
509 | ret = -EOPNOTSUPP; | |
510 | else | |
511 | ret = mtd->unlock(mtd, info.start, info.length); | |
512 | break; | |
513 | } | |
514 | ||
5bd34c09 | 515 | /* Legacy interface */ |
1da177e4 LT |
516 | case MEMGETOOBSEL: |
517 | { | |
5bd34c09 TG |
518 | struct nand_oobinfo oi; |
519 | ||
520 | if (!mtd->ecclayout) | |
521 | return -EOPNOTSUPP; | |
522 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
523 | return -EINVAL; | |
524 | ||
525 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
526 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
527 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
528 | sizeof(oi.oobfree)); | |
529 | ||
530 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
531 | return -EFAULT; |
532 | break; | |
533 | } | |
534 | ||
5bd34c09 TG |
535 | case ECCGETLAYOUT: |
536 | ||
537 | if (!mtd->ecclayout) | |
538 | return -EOPNOTSUPP; | |
539 | ||
540 | if (copy_to_user(argp, &mtd->ecclayout, | |
541 | sizeof(struct nand_ecclayout))) | |
542 | return -EFAULT; | |
543 | break; | |
544 | ||
1da177e4 LT |
545 | case MEMGETBADBLOCK: |
546 | { | |
547 | loff_t offs; | |
97894cda | 548 | |
1da177e4 LT |
549 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
550 | return -EFAULT; | |
551 | if (!mtd->block_isbad) | |
552 | ret = -EOPNOTSUPP; | |
553 | else | |
554 | return mtd->block_isbad(mtd, offs); | |
555 | break; | |
556 | } | |
557 | ||
558 | case MEMSETBADBLOCK: | |
559 | { | |
560 | loff_t offs; | |
561 | ||
562 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
563 | return -EFAULT; | |
564 | if (!mtd->block_markbad) | |
565 | ret = -EOPNOTSUPP; | |
566 | else | |
567 | return mtd->block_markbad(mtd, offs); | |
568 | break; | |
569 | } | |
570 | ||
493c6460 | 571 | #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) |
31f4233b NP |
572 | case OTPSELECT: |
573 | { | |
574 | int mode; | |
575 | if (copy_from_user(&mode, argp, sizeof(int))) | |
576 | return -EFAULT; | |
045e9a5d | 577 | SET_MTD_MODE(file, 0); |
31f4233b NP |
578 | switch (mode) { |
579 | case MTD_OTP_FACTORY: | |
580 | if (!mtd->read_fact_prot_reg) | |
581 | ret = -EOPNOTSUPP; | |
582 | else | |
045e9a5d | 583 | SET_MTD_MODE(file, MTD_MODE_OTP_FACT); |
31f4233b NP |
584 | break; |
585 | case MTD_OTP_USER: | |
586 | if (!mtd->read_fact_prot_reg) | |
587 | ret = -EOPNOTSUPP; | |
588 | else | |
045e9a5d | 589 | SET_MTD_MODE(file, MTD_MODE_OTP_USER); |
31f4233b NP |
590 | break; |
591 | default: | |
592 | ret = -EINVAL; | |
593 | case MTD_OTP_OFF: | |
594 | break; | |
595 | } | |
81dba488 | 596 | file->f_pos = 0; |
31f4233b NP |
597 | break; |
598 | } | |
599 | ||
600 | case OTPGETREGIONCOUNT: | |
601 | case OTPGETREGIONINFO: | |
602 | { | |
603 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
604 | if (!buf) | |
605 | return -ENOMEM; | |
606 | ret = -EOPNOTSUPP; | |
045e9a5d | 607 | switch (MTD_MODE(file)) { |
31f4233b NP |
608 | case MTD_MODE_OTP_FACT: |
609 | if (mtd->get_fact_prot_info) | |
610 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
611 | break; | |
612 | case MTD_MODE_OTP_USER: | |
613 | if (mtd->get_user_prot_info) | |
614 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
615 | break; | |
616 | } | |
617 | if (ret >= 0) { | |
618 | if (cmd == OTPGETREGIONCOUNT) { | |
619 | int nbr = ret / sizeof(struct otp_info); | |
620 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
621 | } else | |
622 | ret = copy_to_user(argp, buf, ret); | |
623 | if (ret) | |
624 | ret = -EFAULT; | |
625 | } | |
626 | kfree(buf); | |
627 | break; | |
628 | } | |
629 | ||
630 | case OTPLOCK: | |
631 | { | |
632 | struct otp_info info; | |
633 | ||
045e9a5d | 634 | if (MTD_MODE(file) != MTD_MODE_OTP_USER) |
31f4233b NP |
635 | return -EINVAL; |
636 | if (copy_from_user(&info, argp, sizeof(info))) | |
637 | return -EFAULT; | |
638 | if (!mtd->lock_user_prot_reg) | |
639 | return -EOPNOTSUPP; | |
640 | ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); | |
641 | break; | |
642 | } | |
643 | #endif | |
644 | ||
1da177e4 LT |
645 | default: |
646 | ret = -ENOTTY; | |
647 | } | |
648 | ||
649 | return ret; | |
650 | } /* memory_ioctl */ | |
651 | ||
652 | static struct file_operations mtd_fops = { | |
653 | .owner = THIS_MODULE, | |
654 | .llseek = mtd_lseek, | |
655 | .read = mtd_read, | |
656 | .write = mtd_write, | |
657 | .ioctl = mtd_ioctl, | |
658 | .open = mtd_open, | |
659 | .release = mtd_close, | |
660 | }; | |
661 | ||
662 | static int __init init_mtdchar(void) | |
663 | { | |
664 | if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { | |
665 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", | |
666 | MTD_CHAR_MAJOR); | |
667 | return -EAGAIN; | |
668 | } | |
669 | ||
9bc7b387 TP |
670 | mtd_class = class_create(THIS_MODULE, "mtd"); |
671 | ||
672 | if (IS_ERR(mtd_class)) { | |
673 | printk(KERN_ERR "Error creating mtd class.\n"); | |
674 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); | |
3a7a8824 | 675 | return PTR_ERR(mtd_class); |
9bc7b387 TP |
676 | } |
677 | ||
678 | register_mtd_user(¬ifier); | |
1da177e4 LT |
679 | return 0; |
680 | } | |
681 | ||
682 | static void __exit cleanup_mtdchar(void) | |
683 | { | |
9bc7b387 TP |
684 | unregister_mtd_user(¬ifier); |
685 | class_destroy(mtd_class); | |
1da177e4 LT |
686 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
687 | } | |
688 | ||
689 | module_init(init_mtdchar); | |
690 | module_exit(cleanup_mtdchar); | |
691 | ||
692 | ||
693 | MODULE_LICENSE("GPL"); | |
694 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
695 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); |