Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
3a7a8824 | 2 | * $Id: mtdchar.c,v 1.73 2005/07/04 17:36:41 gleixner Exp $ |
1da177e4 LT |
3 | * |
4 | * Character-device access to raw MTD devices. | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <linux/config.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/mtd/mtd.h> | |
12 | #include <linux/mtd/compatmac.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/fs.h> | |
16 | #include <asm/uaccess.h> | |
17 | ||
9bc7b387 TP |
18 | #include <linux/device.h> |
19 | ||
20 | static struct class *mtd_class; | |
1da177e4 LT |
21 | |
22 | static void mtd_notify_add(struct mtd_info* mtd) | |
23 | { | |
24 | if (!mtd) | |
25 | return; | |
26 | ||
9bc7b387 TP |
27 | class_device_create(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2), |
28 | NULL, "mtd%d", mtd->index); | |
29 | ||
30 | class_device_create(mtd_class, | |
31 | MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1), | |
32 | NULL, "mtd%dro", mtd->index); | |
1da177e4 LT |
33 | } |
34 | ||
35 | static void mtd_notify_remove(struct mtd_info* mtd) | |
36 | { | |
37 | if (!mtd) | |
38 | return; | |
9bc7b387 TP |
39 | |
40 | class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2)); | |
41 | class_device_destroy(mtd_class, MKDEV(MTD_CHAR_MAJOR, mtd->index*2+1)); | |
1da177e4 LT |
42 | } |
43 | ||
44 | static struct mtd_notifier notifier = { | |
45 | .add = mtd_notify_add, | |
46 | .remove = mtd_notify_remove, | |
47 | }; | |
48 | ||
045e9a5d NP |
49 | /* |
50 | * We use file->private_data to store a pointer to the MTDdevice. | |
51 | * Since alighment is at least 32 bits, we have 2 bits free for OTP | |
52 | * modes as well. | |
53 | */ | |
54 | ||
55 | #define TO_MTD(file) (struct mtd_info *)((long)((file)->private_data) & ~3L) | |
31f4233b | 56 | |
045e9a5d NP |
57 | #define MTD_MODE_OTP_FACT 1 |
58 | #define MTD_MODE_OTP_USER 2 | |
59 | #define MTD_MODE(file) ((long)((file)->private_data) & 3) | |
60 | ||
61 | #define SET_MTD_MODE(file, mode) \ | |
62 | do { long __p = (long)((file)->private_data); \ | |
63 | (file)->private_data = (void *)((__p & ~3L) | mode); } while (0) | |
31f4233b | 64 | |
1da177e4 LT |
65 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
66 | { | |
045e9a5d | 67 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
68 | |
69 | switch (orig) { | |
70 | case 0: | |
71 | /* SEEK_SET */ | |
72 | file->f_pos = offset; | |
73 | break; | |
74 | case 1: | |
75 | /* SEEK_CUR */ | |
76 | file->f_pos += offset; | |
77 | break; | |
78 | case 2: | |
79 | /* SEEK_END */ | |
80 | file->f_pos =mtd->size + offset; | |
81 | break; | |
82 | default: | |
83 | return -EINVAL; | |
84 | } | |
85 | ||
86 | if (file->f_pos < 0) | |
87 | file->f_pos = 0; | |
88 | else if (file->f_pos >= mtd->size) | |
89 | file->f_pos = mtd->size - 1; | |
90 | ||
91 | return file->f_pos; | |
92 | } | |
93 | ||
94 | ||
95 | ||
96 | static int mtd_open(struct inode *inode, struct file *file) | |
97 | { | |
98 | int minor = iminor(inode); | |
99 | int devnum = minor >> 1; | |
100 | struct mtd_info *mtd; | |
101 | ||
102 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
103 | ||
104 | if (devnum >= MAX_MTD_DEVICES) | |
105 | return -ENODEV; | |
106 | ||
107 | /* You can't open the RO devices RW */ | |
108 | if ((file->f_mode & 2) && (minor & 1)) | |
109 | return -EACCES; | |
110 | ||
111 | mtd = get_mtd_device(NULL, devnum); | |
112 | ||
113 | if (!mtd) | |
114 | return -ENODEV; | |
115 | ||
116 | if (MTD_ABSENT == mtd->type) { | |
117 | put_mtd_device(mtd); | |
118 | return -ENODEV; | |
119 | } | |
120 | ||
121 | file->private_data = mtd; | |
122 | ||
123 | /* You can't open it RW if it's not a writeable device */ | |
124 | if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { | |
125 | put_mtd_device(mtd); | |
126 | return -EACCES; | |
127 | } | |
128 | ||
129 | return 0; | |
130 | } /* mtd_open */ | |
131 | ||
132 | /*====================================================================*/ | |
133 | ||
134 | static int mtd_close(struct inode *inode, struct file *file) | |
135 | { | |
136 | struct mtd_info *mtd; | |
137 | ||
138 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
139 | ||
045e9a5d | 140 | mtd = TO_MTD(file); |
1da177e4 LT |
141 | |
142 | if (mtd->sync) | |
143 | mtd->sync(mtd); | |
144 | ||
145 | put_mtd_device(mtd); | |
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 | { | |
045e9a5d | 157 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
158 | size_t retlen=0; |
159 | size_t total_retlen=0; | |
160 | int ret=0; | |
161 | int len; | |
162 | char *kbuf; | |
163 | ||
164 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); | |
165 | ||
166 | if (*ppos + count > mtd->size) | |
167 | count = mtd->size - *ppos; | |
168 | ||
169 | if (!count) | |
170 | return 0; | |
171 | ||
172 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers | |
173 | and pass them directly to the MTD functions */ | |
174 | while (count) { | |
175 | if (count > MAX_KMALLOC_SIZE) | |
176 | len = MAX_KMALLOC_SIZE; | |
177 | else | |
178 | len = count; | |
179 | ||
180 | kbuf=kmalloc(len,GFP_KERNEL); | |
181 | if (!kbuf) | |
182 | return -ENOMEM; | |
183 | ||
045e9a5d | 184 | switch (MTD_MODE(file)) { |
31f4233b NP |
185 | case MTD_MODE_OTP_FACT: |
186 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
187 | break; | |
188 | case MTD_MODE_OTP_USER: | |
189 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
190 | break; | |
191 | default: | |
192 | ret = MTD_READ(mtd, *ppos, len, &retlen, kbuf); | |
193 | } | |
1da177e4 LT |
194 | /* Nand returns -EBADMSG on ecc errors, but it returns |
195 | * the data. For our userspace tools it is important | |
196 | * to dump areas with ecc errors ! | |
197 | * Userspace software which accesses NAND this way | |
198 | * must be aware of the fact that it deals with NAND | |
199 | */ | |
200 | if (!ret || (ret == -EBADMSG)) { | |
201 | *ppos += retlen; | |
202 | if (copy_to_user(buf, kbuf, retlen)) { | |
203 | kfree(kbuf); | |
204 | return -EFAULT; | |
205 | } | |
206 | else | |
207 | total_retlen += retlen; | |
208 | ||
209 | count -= retlen; | |
210 | buf += retlen; | |
31f4233b NP |
211 | if (retlen == 0) |
212 | count = 0; | |
1da177e4 LT |
213 | } |
214 | else { | |
215 | kfree(kbuf); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | kfree(kbuf); | |
220 | } | |
221 | ||
222 | return total_retlen; | |
223 | } /* mtd_read */ | |
224 | ||
225 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
226 | { | |
045e9a5d | 227 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
228 | char *kbuf; |
229 | size_t retlen; | |
230 | size_t total_retlen=0; | |
231 | int ret=0; | |
232 | int len; | |
233 | ||
234 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
235 | ||
236 | if (*ppos == mtd->size) | |
237 | return -ENOSPC; | |
238 | ||
239 | if (*ppos + count > mtd->size) | |
240 | count = mtd->size - *ppos; | |
241 | ||
242 | if (!count) | |
243 | return 0; | |
244 | ||
245 | while (count) { | |
246 | if (count > MAX_KMALLOC_SIZE) | |
247 | len = MAX_KMALLOC_SIZE; | |
248 | else | |
249 | len = count; | |
250 | ||
251 | kbuf=kmalloc(len,GFP_KERNEL); | |
252 | if (!kbuf) { | |
253 | printk("kmalloc is null\n"); | |
254 | return -ENOMEM; | |
255 | } | |
256 | ||
257 | if (copy_from_user(kbuf, buf, len)) { | |
258 | kfree(kbuf); | |
259 | return -EFAULT; | |
260 | } | |
261 | ||
045e9a5d | 262 | switch (MTD_MODE(file)) { |
31f4233b NP |
263 | case MTD_MODE_OTP_FACT: |
264 | ret = -EROFS; | |
265 | break; | |
266 | case MTD_MODE_OTP_USER: | |
267 | if (!mtd->write_user_prot_reg) { | |
268 | ret = -EOPNOTSUPP; | |
269 | break; | |
270 | } | |
271 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
272 | break; | |
273 | default: | |
274 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
275 | } | |
1da177e4 LT |
276 | if (!ret) { |
277 | *ppos += retlen; | |
278 | total_retlen += retlen; | |
279 | count -= retlen; | |
280 | buf += retlen; | |
281 | } | |
282 | else { | |
283 | kfree(kbuf); | |
284 | return ret; | |
285 | } | |
286 | ||
287 | kfree(kbuf); | |
288 | } | |
289 | ||
290 | return total_retlen; | |
291 | } /* mtd_write */ | |
292 | ||
293 | /*====================================================================== | |
294 | ||
295 | IOCTL calls for getting device parameters. | |
296 | ||
297 | ======================================================================*/ | |
298 | static void mtdchar_erase_callback (struct erase_info *instr) | |
299 | { | |
300 | wake_up((wait_queue_head_t *)instr->priv); | |
301 | } | |
302 | ||
303 | static int mtd_ioctl(struct inode *inode, struct file *file, | |
304 | u_int cmd, u_long arg) | |
305 | { | |
045e9a5d | 306 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
307 | void __user *argp = (void __user *)arg; |
308 | int ret = 0; | |
309 | u_long size; | |
310 | ||
311 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); | |
312 | ||
313 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
314 | if (cmd & IOC_IN) { | |
315 | if (!access_ok(VERIFY_READ, argp, size)) | |
316 | return -EFAULT; | |
317 | } | |
318 | if (cmd & IOC_OUT) { | |
319 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
320 | return -EFAULT; | |
321 | } | |
322 | ||
323 | switch (cmd) { | |
324 | case MEMGETREGIONCOUNT: | |
325 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
326 | return -EFAULT; | |
327 | break; | |
328 | ||
329 | case MEMGETREGIONINFO: | |
330 | { | |
331 | struct region_info_user ur; | |
332 | ||
333 | if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) | |
334 | return -EFAULT; | |
335 | ||
336 | if (ur.regionindex >= mtd->numeraseregions) | |
337 | return -EINVAL; | |
338 | if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), | |
339 | sizeof(struct mtd_erase_region_info))) | |
340 | return -EFAULT; | |
341 | break; | |
342 | } | |
343 | ||
344 | case MEMGETINFO: | |
345 | if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user))) | |
346 | return -EFAULT; | |
347 | break; | |
348 | ||
349 | case MEMERASE: | |
350 | { | |
351 | struct erase_info *erase; | |
352 | ||
353 | if(!(file->f_mode & 2)) | |
354 | return -EPERM; | |
355 | ||
356 | erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL); | |
357 | if (!erase) | |
358 | ret = -ENOMEM; | |
359 | else { | |
360 | wait_queue_head_t waitq; | |
361 | DECLARE_WAITQUEUE(wait, current); | |
362 | ||
363 | init_waitqueue_head(&waitq); | |
364 | ||
365 | memset (erase,0,sizeof(struct erase_info)); | |
366 | if (copy_from_user(&erase->addr, argp, | |
367 | sizeof(struct erase_info_user))) { | |
368 | kfree(erase); | |
369 | return -EFAULT; | |
370 | } | |
371 | erase->mtd = mtd; | |
372 | erase->callback = mtdchar_erase_callback; | |
373 | erase->priv = (unsigned long)&waitq; | |
374 | ||
375 | /* | |
376 | FIXME: Allow INTERRUPTIBLE. Which means | |
377 | not having the wait_queue head on the stack. | |
378 | ||
379 | If the wq_head is on the stack, and we | |
380 | leave because we got interrupted, then the | |
381 | wq_head is no longer there when the | |
382 | callback routine tries to wake us up. | |
383 | */ | |
384 | ret = mtd->erase(mtd, erase); | |
385 | if (!ret) { | |
386 | set_current_state(TASK_UNINTERRUPTIBLE); | |
387 | add_wait_queue(&waitq, &wait); | |
388 | if (erase->state != MTD_ERASE_DONE && | |
389 | erase->state != MTD_ERASE_FAILED) | |
390 | schedule(); | |
391 | remove_wait_queue(&waitq, &wait); | |
392 | set_current_state(TASK_RUNNING); | |
393 | ||
394 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
395 | } | |
396 | kfree(erase); | |
397 | } | |
398 | break; | |
399 | } | |
400 | ||
401 | case MEMWRITEOOB: | |
402 | { | |
403 | struct mtd_oob_buf buf; | |
404 | void *databuf; | |
405 | ssize_t retlen; | |
406 | ||
407 | if(!(file->f_mode & 2)) | |
408 | return -EPERM; | |
409 | ||
410 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
411 | return -EFAULT; | |
412 | ||
413 | if (buf.length > 0x4096) | |
414 | return -EINVAL; | |
415 | ||
416 | if (!mtd->write_oob) | |
417 | ret = -EOPNOTSUPP; | |
418 | else | |
419 | ret = access_ok(VERIFY_READ, buf.ptr, | |
420 | buf.length) ? 0 : EFAULT; | |
421 | ||
422 | if (ret) | |
423 | return ret; | |
424 | ||
425 | databuf = kmalloc(buf.length, GFP_KERNEL); | |
426 | if (!databuf) | |
427 | return -ENOMEM; | |
428 | ||
429 | if (copy_from_user(databuf, buf.ptr, buf.length)) { | |
430 | kfree(databuf); | |
431 | return -EFAULT; | |
432 | } | |
433 | ||
434 | ret = (mtd->write_oob)(mtd, buf.start, buf.length, &retlen, databuf); | |
435 | ||
436 | if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t))) | |
437 | ret = -EFAULT; | |
438 | ||
439 | kfree(databuf); | |
440 | break; | |
441 | ||
442 | } | |
443 | ||
444 | case MEMREADOOB: | |
445 | { | |
446 | struct mtd_oob_buf buf; | |
447 | void *databuf; | |
448 | ssize_t retlen; | |
449 | ||
450 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
451 | return -EFAULT; | |
452 | ||
453 | if (buf.length > 0x4096) | |
454 | return -EINVAL; | |
455 | ||
456 | if (!mtd->read_oob) | |
457 | ret = -EOPNOTSUPP; | |
458 | else | |
459 | ret = access_ok(VERIFY_WRITE, buf.ptr, | |
460 | buf.length) ? 0 : -EFAULT; | |
461 | ||
462 | if (ret) | |
463 | return ret; | |
464 | ||
465 | databuf = kmalloc(buf.length, GFP_KERNEL); | |
466 | if (!databuf) | |
467 | return -ENOMEM; | |
468 | ||
469 | ret = (mtd->read_oob)(mtd, buf.start, buf.length, &retlen, databuf); | |
470 | ||
471 | if (put_user(retlen, (uint32_t __user *)argp)) | |
472 | ret = -EFAULT; | |
473 | else if (retlen && copy_to_user(buf.ptr, databuf, retlen)) | |
474 | ret = -EFAULT; | |
475 | ||
476 | kfree(databuf); | |
477 | break; | |
478 | } | |
479 | ||
480 | case MEMLOCK: | |
481 | { | |
482 | struct erase_info_user info; | |
483 | ||
484 | if (copy_from_user(&info, argp, sizeof(info))) | |
485 | return -EFAULT; | |
486 | ||
487 | if (!mtd->lock) | |
488 | ret = -EOPNOTSUPP; | |
489 | else | |
490 | ret = mtd->lock(mtd, info.start, info.length); | |
491 | break; | |
492 | } | |
493 | ||
494 | case MEMUNLOCK: | |
495 | { | |
496 | struct erase_info_user info; | |
497 | ||
498 | if (copy_from_user(&info, argp, sizeof(info))) | |
499 | return -EFAULT; | |
500 | ||
501 | if (!mtd->unlock) | |
502 | ret = -EOPNOTSUPP; | |
503 | else | |
504 | ret = mtd->unlock(mtd, info.start, info.length); | |
505 | break; | |
506 | } | |
507 | ||
508 | case MEMSETOOBSEL: | |
509 | { | |
510 | if (copy_from_user(&mtd->oobinfo, argp, sizeof(struct nand_oobinfo))) | |
511 | return -EFAULT; | |
512 | break; | |
513 | } | |
514 | ||
515 | case MEMGETOOBSEL: | |
516 | { | |
517 | if (copy_to_user(argp, &(mtd->oobinfo), sizeof(struct nand_oobinfo))) | |
518 | return -EFAULT; | |
519 | break; | |
520 | } | |
521 | ||
522 | case MEMGETBADBLOCK: | |
523 | { | |
524 | loff_t offs; | |
525 | ||
526 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
527 | return -EFAULT; | |
528 | if (!mtd->block_isbad) | |
529 | ret = -EOPNOTSUPP; | |
530 | else | |
531 | return mtd->block_isbad(mtd, offs); | |
532 | break; | |
533 | } | |
534 | ||
535 | case MEMSETBADBLOCK: | |
536 | { | |
537 | loff_t offs; | |
538 | ||
539 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
540 | return -EFAULT; | |
541 | if (!mtd->block_markbad) | |
542 | ret = -EOPNOTSUPP; | |
543 | else | |
544 | return mtd->block_markbad(mtd, offs); | |
545 | break; | |
546 | } | |
547 | ||
31f4233b NP |
548 | #ifdef CONFIG_MTD_OTP |
549 | case OTPSELECT: | |
550 | { | |
551 | int mode; | |
552 | if (copy_from_user(&mode, argp, sizeof(int))) | |
553 | return -EFAULT; | |
045e9a5d | 554 | SET_MTD_MODE(file, 0); |
31f4233b NP |
555 | switch (mode) { |
556 | case MTD_OTP_FACTORY: | |
557 | if (!mtd->read_fact_prot_reg) | |
558 | ret = -EOPNOTSUPP; | |
559 | else | |
045e9a5d | 560 | SET_MTD_MODE(file, MTD_MODE_OTP_FACT); |
31f4233b NP |
561 | break; |
562 | case MTD_OTP_USER: | |
563 | if (!mtd->read_fact_prot_reg) | |
564 | ret = -EOPNOTSUPP; | |
565 | else | |
045e9a5d | 566 | SET_MTD_MODE(file, MTD_MODE_OTP_USER); |
31f4233b NP |
567 | break; |
568 | default: | |
569 | ret = -EINVAL; | |
570 | case MTD_OTP_OFF: | |
571 | break; | |
572 | } | |
81dba488 | 573 | file->f_pos = 0; |
31f4233b NP |
574 | break; |
575 | } | |
576 | ||
577 | case OTPGETREGIONCOUNT: | |
578 | case OTPGETREGIONINFO: | |
579 | { | |
580 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
581 | if (!buf) | |
582 | return -ENOMEM; | |
583 | ret = -EOPNOTSUPP; | |
045e9a5d | 584 | switch (MTD_MODE(file)) { |
31f4233b NP |
585 | case MTD_MODE_OTP_FACT: |
586 | if (mtd->get_fact_prot_info) | |
587 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
588 | break; | |
589 | case MTD_MODE_OTP_USER: | |
590 | if (mtd->get_user_prot_info) | |
591 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
592 | break; | |
593 | } | |
594 | if (ret >= 0) { | |
595 | if (cmd == OTPGETREGIONCOUNT) { | |
596 | int nbr = ret / sizeof(struct otp_info); | |
597 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
598 | } else | |
599 | ret = copy_to_user(argp, buf, ret); | |
600 | if (ret) | |
601 | ret = -EFAULT; | |
602 | } | |
603 | kfree(buf); | |
604 | break; | |
605 | } | |
606 | ||
607 | case OTPLOCK: | |
608 | { | |
609 | struct otp_info info; | |
610 | ||
045e9a5d | 611 | if (MTD_MODE(file) != MTD_MODE_OTP_USER) |
31f4233b NP |
612 | return -EINVAL; |
613 | if (copy_from_user(&info, argp, sizeof(info))) | |
614 | return -EFAULT; | |
615 | if (!mtd->lock_user_prot_reg) | |
616 | return -EOPNOTSUPP; | |
617 | ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); | |
618 | break; | |
619 | } | |
620 | #endif | |
621 | ||
1da177e4 LT |
622 | default: |
623 | ret = -ENOTTY; | |
624 | } | |
625 | ||
626 | return ret; | |
627 | } /* memory_ioctl */ | |
628 | ||
629 | static struct file_operations mtd_fops = { | |
630 | .owner = THIS_MODULE, | |
631 | .llseek = mtd_lseek, | |
632 | .read = mtd_read, | |
633 | .write = mtd_write, | |
634 | .ioctl = mtd_ioctl, | |
635 | .open = mtd_open, | |
636 | .release = mtd_close, | |
637 | }; | |
638 | ||
639 | static int __init init_mtdchar(void) | |
640 | { | |
641 | if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { | |
642 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", | |
643 | MTD_CHAR_MAJOR); | |
644 | return -EAGAIN; | |
645 | } | |
646 | ||
9bc7b387 TP |
647 | mtd_class = class_create(THIS_MODULE, "mtd"); |
648 | ||
649 | if (IS_ERR(mtd_class)) { | |
650 | printk(KERN_ERR "Error creating mtd class.\n"); | |
651 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); | |
3a7a8824 | 652 | return PTR_ERR(mtd_class); |
9bc7b387 TP |
653 | } |
654 | ||
655 | register_mtd_user(¬ifier); | |
1da177e4 LT |
656 | return 0; |
657 | } | |
658 | ||
659 | static void __exit cleanup_mtdchar(void) | |
660 | { | |
9bc7b387 TP |
661 | unregister_mtd_user(¬ifier); |
662 | class_destroy(mtd_class); | |
1da177e4 LT |
663 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
664 | } | |
665 | ||
666 | module_init(init_mtdchar); | |
667 | module_exit(cleanup_mtdchar); | |
668 | ||
669 | ||
670 | MODULE_LICENSE("GPL"); | |
671 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
672 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); |