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> | |
4e57b681 | 16 | #include <linux/sched.h> /* TASK_* */ |
1da177e4 LT |
17 | #include <asm/uaccess.h> |
18 | ||
9bc7b387 TP |
19 | #include <linux/device.h> |
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 TP |
29 | NULL, "mtd%d", mtd->index); |
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 NP |
50 | /* |
51 | * We use file->private_data to store a pointer to the MTDdevice. | |
52 | * Since alighment is at least 32 bits, we have 2 bits free for OTP | |
53 | * modes as well. | |
54 | */ | |
55 | ||
56 | #define TO_MTD(file) (struct mtd_info *)((long)((file)->private_data) & ~3L) | |
31f4233b | 57 | |
045e9a5d NP |
58 | #define MTD_MODE_OTP_FACT 1 |
59 | #define MTD_MODE_OTP_USER 2 | |
60 | #define MTD_MODE(file) ((long)((file)->private_data) & 3) | |
61 | ||
62 | #define SET_MTD_MODE(file, mode) \ | |
63 | do { long __p = (long)((file)->private_data); \ | |
64 | (file)->private_data = (void *)((__p & ~3L) | mode); } while (0) | |
31f4233b | 65 | |
1da177e4 LT |
66 | static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) |
67 | { | |
045e9a5d | 68 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
69 | |
70 | switch (orig) { | |
71 | case 0: | |
72 | /* SEEK_SET */ | |
73 | file->f_pos = offset; | |
74 | break; | |
75 | case 1: | |
76 | /* SEEK_CUR */ | |
77 | file->f_pos += offset; | |
78 | break; | |
79 | case 2: | |
80 | /* SEEK_END */ | |
81 | file->f_pos =mtd->size + offset; | |
82 | break; | |
83 | default: | |
84 | return -EINVAL; | |
85 | } | |
86 | ||
87 | if (file->f_pos < 0) | |
88 | file->f_pos = 0; | |
89 | else if (file->f_pos >= mtd->size) | |
90 | file->f_pos = mtd->size - 1; | |
91 | ||
92 | return file->f_pos; | |
93 | } | |
94 | ||
95 | ||
96 | ||
97 | static int mtd_open(struct inode *inode, struct file *file) | |
98 | { | |
99 | int minor = iminor(inode); | |
100 | int devnum = minor >> 1; | |
101 | struct mtd_info *mtd; | |
102 | ||
103 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
104 | ||
105 | if (devnum >= MAX_MTD_DEVICES) | |
106 | return -ENODEV; | |
107 | ||
108 | /* You can't open the RO devices RW */ | |
109 | if ((file->f_mode & 2) && (minor & 1)) | |
110 | return -EACCES; | |
111 | ||
112 | mtd = get_mtd_device(NULL, devnum); | |
113 | ||
114 | if (!mtd) | |
115 | return -ENODEV; | |
116 | ||
117 | if (MTD_ABSENT == mtd->type) { | |
118 | put_mtd_device(mtd); | |
119 | return -ENODEV; | |
120 | } | |
121 | ||
122 | file->private_data = mtd; | |
123 | ||
124 | /* You can't open it RW if it's not a writeable device */ | |
125 | if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { | |
126 | put_mtd_device(mtd); | |
127 | return -EACCES; | |
128 | } | |
129 | ||
130 | return 0; | |
131 | } /* mtd_open */ | |
132 | ||
133 | /*====================================================================*/ | |
134 | ||
135 | static int mtd_close(struct inode *inode, struct file *file) | |
136 | { | |
137 | struct mtd_info *mtd; | |
138 | ||
139 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
140 | ||
045e9a5d | 141 | mtd = TO_MTD(file); |
1da177e4 LT |
142 | |
143 | if (mtd->sync) | |
144 | mtd->sync(mtd); | |
145 | ||
146 | put_mtd_device(mtd); | |
147 | ||
148 | return 0; | |
149 | } /* mtd_close */ | |
150 | ||
151 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
152 | userspace buffer down and use it directly with readv/writev. | |
153 | */ | |
154 | #define MAX_KMALLOC_SIZE 0x20000 | |
155 | ||
156 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
157 | { | |
045e9a5d | 158 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
159 | size_t retlen=0; |
160 | size_t total_retlen=0; | |
161 | int ret=0; | |
162 | int len; | |
163 | char *kbuf; | |
164 | ||
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; | |
172 | ||
173 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers | |
174 | and pass them directly to the MTD functions */ | |
175 | while (count) { | |
176 | if (count > MAX_KMALLOC_SIZE) | |
177 | len = MAX_KMALLOC_SIZE; | |
178 | else | |
179 | len = count; | |
180 | ||
181 | kbuf=kmalloc(len,GFP_KERNEL); | |
182 | if (!kbuf) | |
183 | return -ENOMEM; | |
184 | ||
045e9a5d | 185 | switch (MTD_MODE(file)) { |
31f4233b NP |
186 | case MTD_MODE_OTP_FACT: |
187 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
188 | break; | |
189 | case MTD_MODE_OTP_USER: | |
190 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
191 | break; | |
192 | default: | |
193 | ret = MTD_READ(mtd, *ppos, len, &retlen, kbuf); | |
194 | } | |
1da177e4 LT |
195 | /* Nand returns -EBADMSG on ecc errors, but it returns |
196 | * the data. For our userspace tools it is important | |
197 | * to dump areas with ecc errors ! | |
198 | * Userspace software which accesses NAND this way | |
199 | * must be aware of the fact that it deals with NAND | |
200 | */ | |
201 | if (!ret || (ret == -EBADMSG)) { | |
202 | *ppos += retlen; | |
203 | if (copy_to_user(buf, kbuf, retlen)) { | |
204 | kfree(kbuf); | |
205 | return -EFAULT; | |
206 | } | |
207 | else | |
208 | total_retlen += retlen; | |
209 | ||
210 | count -= retlen; | |
211 | buf += retlen; | |
31f4233b NP |
212 | if (retlen == 0) |
213 | count = 0; | |
1da177e4 LT |
214 | } |
215 | else { | |
216 | kfree(kbuf); | |
217 | return ret; | |
218 | } | |
219 | ||
220 | kfree(kbuf); | |
221 | } | |
222 | ||
223 | return total_retlen; | |
224 | } /* mtd_read */ | |
225 | ||
226 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
227 | { | |
045e9a5d | 228 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
229 | char *kbuf; |
230 | size_t retlen; | |
231 | size_t total_retlen=0; | |
232 | int ret=0; | |
233 | int len; | |
234 | ||
235 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
236 | ||
237 | if (*ppos == mtd->size) | |
238 | return -ENOSPC; | |
239 | ||
240 | if (*ppos + count > mtd->size) | |
241 | count = mtd->size - *ppos; | |
242 | ||
243 | if (!count) | |
244 | return 0; | |
245 | ||
246 | while (count) { | |
247 | if (count > MAX_KMALLOC_SIZE) | |
248 | len = MAX_KMALLOC_SIZE; | |
249 | else | |
250 | len = count; | |
251 | ||
252 | kbuf=kmalloc(len,GFP_KERNEL); | |
253 | if (!kbuf) { | |
254 | printk("kmalloc is null\n"); | |
255 | return -ENOMEM; | |
256 | } | |
257 | ||
258 | if (copy_from_user(kbuf, buf, len)) { | |
259 | kfree(kbuf); | |
260 | return -EFAULT; | |
261 | } | |
262 | ||
045e9a5d | 263 | switch (MTD_MODE(file)) { |
31f4233b NP |
264 | case MTD_MODE_OTP_FACT: |
265 | ret = -EROFS; | |
266 | break; | |
267 | case MTD_MODE_OTP_USER: | |
268 | if (!mtd->write_user_prot_reg) { | |
269 | ret = -EOPNOTSUPP; | |
270 | break; | |
271 | } | |
272 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
273 | break; | |
274 | default: | |
275 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
276 | } | |
1da177e4 LT |
277 | if (!ret) { |
278 | *ppos += retlen; | |
279 | total_retlen += retlen; | |
280 | count -= retlen; | |
281 | buf += retlen; | |
282 | } | |
283 | else { | |
284 | kfree(kbuf); | |
285 | return ret; | |
286 | } | |
287 | ||
288 | kfree(kbuf); | |
289 | } | |
290 | ||
291 | return total_retlen; | |
292 | } /* mtd_write */ | |
293 | ||
294 | /*====================================================================== | |
295 | ||
296 | IOCTL calls for getting device parameters. | |
297 | ||
298 | ======================================================================*/ | |
299 | static void mtdchar_erase_callback (struct erase_info *instr) | |
300 | { | |
301 | wake_up((wait_queue_head_t *)instr->priv); | |
302 | } | |
303 | ||
304 | static int mtd_ioctl(struct inode *inode, struct file *file, | |
305 | u_int cmd, u_long arg) | |
306 | { | |
045e9a5d | 307 | struct mtd_info *mtd = TO_MTD(file); |
1da177e4 LT |
308 | void __user *argp = (void __user *)arg; |
309 | int ret = 0; | |
310 | u_long size; | |
311 | ||
312 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); | |
313 | ||
314 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
315 | if (cmd & IOC_IN) { | |
316 | if (!access_ok(VERIFY_READ, argp, size)) | |
317 | return -EFAULT; | |
318 | } | |
319 | if (cmd & IOC_OUT) { | |
320 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
321 | return -EFAULT; | |
322 | } | |
323 | ||
324 | switch (cmd) { | |
325 | case MEMGETREGIONCOUNT: | |
326 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
327 | return -EFAULT; | |
328 | break; | |
329 | ||
330 | case MEMGETREGIONINFO: | |
331 | { | |
332 | struct region_info_user ur; | |
333 | ||
334 | if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) | |
335 | return -EFAULT; | |
336 | ||
337 | if (ur.regionindex >= mtd->numeraseregions) | |
338 | return -EINVAL; | |
339 | if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), | |
340 | sizeof(struct mtd_erase_region_info))) | |
341 | return -EFAULT; | |
342 | break; | |
343 | } | |
344 | ||
345 | case MEMGETINFO: | |
346 | if (copy_to_user(argp, mtd, sizeof(struct mtd_info_user))) | |
347 | return -EFAULT; | |
348 | break; | |
349 | ||
350 | case MEMERASE: | |
351 | { | |
352 | struct erase_info *erase; | |
353 | ||
354 | if(!(file->f_mode & 2)) | |
355 | return -EPERM; | |
356 | ||
357 | erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL); | |
358 | if (!erase) | |
359 | ret = -ENOMEM; | |
360 | else { | |
361 | wait_queue_head_t waitq; | |
362 | DECLARE_WAITQUEUE(wait, current); | |
363 | ||
364 | init_waitqueue_head(&waitq); | |
365 | ||
366 | memset (erase,0,sizeof(struct erase_info)); | |
367 | if (copy_from_user(&erase->addr, argp, | |
368 | sizeof(struct erase_info_user))) { | |
369 | kfree(erase); | |
370 | return -EFAULT; | |
371 | } | |
372 | erase->mtd = mtd; | |
373 | erase->callback = mtdchar_erase_callback; | |
374 | erase->priv = (unsigned long)&waitq; | |
375 | ||
376 | /* | |
377 | FIXME: Allow INTERRUPTIBLE. Which means | |
378 | not having the wait_queue head on the stack. | |
379 | ||
380 | If the wq_head is on the stack, and we | |
381 | leave because we got interrupted, then the | |
382 | wq_head is no longer there when the | |
383 | callback routine tries to wake us up. | |
384 | */ | |
385 | ret = mtd->erase(mtd, erase); | |
386 | if (!ret) { | |
387 | set_current_state(TASK_UNINTERRUPTIBLE); | |
388 | add_wait_queue(&waitq, &wait); | |
389 | if (erase->state != MTD_ERASE_DONE && | |
390 | erase->state != MTD_ERASE_FAILED) | |
391 | schedule(); | |
392 | remove_wait_queue(&waitq, &wait); | |
393 | set_current_state(TASK_RUNNING); | |
394 | ||
395 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
396 | } | |
397 | kfree(erase); | |
398 | } | |
399 | break; | |
400 | } | |
401 | ||
402 | case MEMWRITEOOB: | |
403 | { | |
404 | struct mtd_oob_buf buf; | |
405 | void *databuf; | |
406 | ssize_t retlen; | |
407 | ||
408 | if(!(file->f_mode & 2)) | |
409 | return -EPERM; | |
410 | ||
411 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
412 | return -EFAULT; | |
413 | ||
414 | if (buf.length > 0x4096) | |
415 | return -EINVAL; | |
416 | ||
417 | if (!mtd->write_oob) | |
418 | ret = -EOPNOTSUPP; | |
419 | else | |
420 | ret = access_ok(VERIFY_READ, buf.ptr, | |
421 | buf.length) ? 0 : EFAULT; | |
422 | ||
423 | if (ret) | |
424 | return ret; | |
425 | ||
426 | databuf = kmalloc(buf.length, GFP_KERNEL); | |
427 | if (!databuf) | |
428 | return -ENOMEM; | |
429 | ||
430 | if (copy_from_user(databuf, buf.ptr, buf.length)) { | |
431 | kfree(databuf); | |
432 | return -EFAULT; | |
433 | } | |
434 | ||
435 | ret = (mtd->write_oob)(mtd, buf.start, buf.length, &retlen, databuf); | |
436 | ||
437 | if (copy_to_user(argp + sizeof(uint32_t), &retlen, sizeof(uint32_t))) | |
438 | ret = -EFAULT; | |
439 | ||
440 | kfree(databuf); | |
441 | break; | |
442 | ||
443 | } | |
444 | ||
445 | case MEMREADOOB: | |
446 | { | |
447 | struct mtd_oob_buf buf; | |
448 | void *databuf; | |
449 | ssize_t retlen; | |
450 | ||
451 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
452 | return -EFAULT; | |
453 | ||
454 | if (buf.length > 0x4096) | |
455 | return -EINVAL; | |
456 | ||
457 | if (!mtd->read_oob) | |
458 | ret = -EOPNOTSUPP; | |
459 | else | |
460 | ret = access_ok(VERIFY_WRITE, buf.ptr, | |
461 | buf.length) ? 0 : -EFAULT; | |
462 | ||
463 | if (ret) | |
464 | return ret; | |
465 | ||
466 | databuf = kmalloc(buf.length, GFP_KERNEL); | |
467 | if (!databuf) | |
468 | return -ENOMEM; | |
469 | ||
470 | ret = (mtd->read_oob)(mtd, buf.start, buf.length, &retlen, databuf); | |
471 | ||
472 | if (put_user(retlen, (uint32_t __user *)argp)) | |
473 | ret = -EFAULT; | |
474 | else if (retlen && copy_to_user(buf.ptr, databuf, retlen)) | |
475 | ret = -EFAULT; | |
476 | ||
477 | kfree(databuf); | |
478 | break; | |
479 | } | |
480 | ||
481 | case MEMLOCK: | |
482 | { | |
483 | struct erase_info_user info; | |
484 | ||
485 | if (copy_from_user(&info, argp, sizeof(info))) | |
486 | return -EFAULT; | |
487 | ||
488 | if (!mtd->lock) | |
489 | ret = -EOPNOTSUPP; | |
490 | else | |
491 | ret = mtd->lock(mtd, info.start, info.length); | |
492 | break; | |
493 | } | |
494 | ||
495 | case MEMUNLOCK: | |
496 | { | |
497 | struct erase_info_user info; | |
498 | ||
499 | if (copy_from_user(&info, argp, sizeof(info))) | |
500 | return -EFAULT; | |
501 | ||
502 | if (!mtd->unlock) | |
503 | ret = -EOPNOTSUPP; | |
504 | else | |
505 | ret = mtd->unlock(mtd, info.start, info.length); | |
506 | break; | |
507 | } | |
508 | ||
509 | case MEMSETOOBSEL: | |
510 | { | |
511 | if (copy_from_user(&mtd->oobinfo, argp, sizeof(struct nand_oobinfo))) | |
512 | return -EFAULT; | |
513 | break; | |
514 | } | |
515 | ||
516 | case MEMGETOOBSEL: | |
517 | { | |
518 | if (copy_to_user(argp, &(mtd->oobinfo), sizeof(struct nand_oobinfo))) | |
519 | return -EFAULT; | |
520 | break; | |
521 | } | |
522 | ||
523 | case MEMGETBADBLOCK: | |
524 | { | |
525 | loff_t offs; | |
526 | ||
527 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
528 | return -EFAULT; | |
529 | if (!mtd->block_isbad) | |
530 | ret = -EOPNOTSUPP; | |
531 | else | |
532 | return mtd->block_isbad(mtd, offs); | |
533 | break; | |
534 | } | |
535 | ||
536 | case MEMSETBADBLOCK: | |
537 | { | |
538 | loff_t offs; | |
539 | ||
540 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
541 | return -EFAULT; | |
542 | if (!mtd->block_markbad) | |
543 | ret = -EOPNOTSUPP; | |
544 | else | |
545 | return mtd->block_markbad(mtd, offs); | |
546 | break; | |
547 | } | |
548 | ||
31f4233b NP |
549 | #ifdef CONFIG_MTD_OTP |
550 | case OTPSELECT: | |
551 | { | |
552 | int mode; | |
553 | if (copy_from_user(&mode, argp, sizeof(int))) | |
554 | return -EFAULT; | |
045e9a5d | 555 | SET_MTD_MODE(file, 0); |
31f4233b NP |
556 | switch (mode) { |
557 | case MTD_OTP_FACTORY: | |
558 | if (!mtd->read_fact_prot_reg) | |
559 | ret = -EOPNOTSUPP; | |
560 | else | |
045e9a5d | 561 | SET_MTD_MODE(file, MTD_MODE_OTP_FACT); |
31f4233b NP |
562 | break; |
563 | case MTD_OTP_USER: | |
564 | if (!mtd->read_fact_prot_reg) | |
565 | ret = -EOPNOTSUPP; | |
566 | else | |
045e9a5d | 567 | SET_MTD_MODE(file, MTD_MODE_OTP_USER); |
31f4233b NP |
568 | break; |
569 | default: | |
570 | ret = -EINVAL; | |
571 | case MTD_OTP_OFF: | |
572 | break; | |
573 | } | |
81dba488 | 574 | file->f_pos = 0; |
31f4233b NP |
575 | break; |
576 | } | |
577 | ||
578 | case OTPGETREGIONCOUNT: | |
579 | case OTPGETREGIONINFO: | |
580 | { | |
581 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
582 | if (!buf) | |
583 | return -ENOMEM; | |
584 | ret = -EOPNOTSUPP; | |
045e9a5d | 585 | switch (MTD_MODE(file)) { |
31f4233b NP |
586 | case MTD_MODE_OTP_FACT: |
587 | if (mtd->get_fact_prot_info) | |
588 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
589 | break; | |
590 | case MTD_MODE_OTP_USER: | |
591 | if (mtd->get_user_prot_info) | |
592 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
593 | break; | |
594 | } | |
595 | if (ret >= 0) { | |
596 | if (cmd == OTPGETREGIONCOUNT) { | |
597 | int nbr = ret / sizeof(struct otp_info); | |
598 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
599 | } else | |
600 | ret = copy_to_user(argp, buf, ret); | |
601 | if (ret) | |
602 | ret = -EFAULT; | |
603 | } | |
604 | kfree(buf); | |
605 | break; | |
606 | } | |
607 | ||
608 | case OTPLOCK: | |
609 | { | |
610 | struct otp_info info; | |
611 | ||
045e9a5d | 612 | if (MTD_MODE(file) != MTD_MODE_OTP_USER) |
31f4233b NP |
613 | return -EINVAL; |
614 | if (copy_from_user(&info, argp, sizeof(info))) | |
615 | return -EFAULT; | |
616 | if (!mtd->lock_user_prot_reg) | |
617 | return -EOPNOTSUPP; | |
618 | ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); | |
619 | break; | |
620 | } | |
621 | #endif | |
622 | ||
1da177e4 LT |
623 | default: |
624 | ret = -ENOTTY; | |
625 | } | |
626 | ||
627 | return ret; | |
628 | } /* memory_ioctl */ | |
629 | ||
630 | static struct file_operations mtd_fops = { | |
631 | .owner = THIS_MODULE, | |
632 | .llseek = mtd_lseek, | |
633 | .read = mtd_read, | |
634 | .write = mtd_write, | |
635 | .ioctl = mtd_ioctl, | |
636 | .open = mtd_open, | |
637 | .release = mtd_close, | |
638 | }; | |
639 | ||
640 | static int __init init_mtdchar(void) | |
641 | { | |
642 | if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { | |
643 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", | |
644 | MTD_CHAR_MAJOR); | |
645 | return -EAGAIN; | |
646 | } | |
647 | ||
9bc7b387 TP |
648 | mtd_class = class_create(THIS_MODULE, "mtd"); |
649 | ||
650 | if (IS_ERR(mtd_class)) { | |
651 | printk(KERN_ERR "Error creating mtd class.\n"); | |
652 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); | |
3a7a8824 | 653 | return PTR_ERR(mtd_class); |
9bc7b387 TP |
654 | } |
655 | ||
656 | register_mtd_user(¬ifier); | |
1da177e4 LT |
657 | return 0; |
658 | } | |
659 | ||
660 | static void __exit cleanup_mtdchar(void) | |
661 | { | |
9bc7b387 TP |
662 | unregister_mtd_user(¬ifier); |
663 | class_destroy(mtd_class); | |
1da177e4 LT |
664 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
665 | } | |
666 | ||
667 | module_init(init_mtdchar); | |
668 | module_exit(cleanup_mtdchar); | |
669 | ||
670 | ||
671 | MODULE_LICENSE("GPL"); | |
672 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
673 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); |