Commit | Line | Data |
---|---|---|
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) { | |
ea59830d | 65 | case SEEK_SET: |
1da177e4 | 66 | break; |
ea59830d | 67 | case SEEK_CUR: |
8b491d75 | 68 | offset += file->f_pos; |
1da177e4 | 69 | break; |
ea59830d | 70 | case SEEK_END: |
8b491d75 | 71 | offset += mtd->size; |
1da177e4 LT |
72 | break; |
73 | default: | |
74 | return -EINVAL; | |
75 | } | |
76 | ||
1887f517 | 77 | if (offset >= 0 && offset <= mtd->size) |
8b491d75 | 78 | return file->f_pos = offset; |
1da177e4 | 79 | |
8b491d75 | 80 | return -EINVAL; |
1da177e4 LT |
81 | } |
82 | ||
83 | ||
84 | ||
85 | static int mtd_open(struct inode *inode, struct file *file) | |
86 | { | |
87 | int minor = iminor(inode); | |
88 | int devnum = minor >> 1; | |
89 | struct mtd_info *mtd; | |
f1a28c02 | 90 | struct mtd_file_info *mfi; |
1da177e4 LT |
91 | |
92 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); | |
93 | ||
94 | if (devnum >= MAX_MTD_DEVICES) | |
95 | return -ENODEV; | |
96 | ||
97 | /* You can't open the RO devices RW */ | |
98 | if ((file->f_mode & 2) && (minor & 1)) | |
99 | return -EACCES; | |
100 | ||
101 | mtd = get_mtd_device(NULL, devnum); | |
97894cda | 102 | |
1da177e4 LT |
103 | if (!mtd) |
104 | return -ENODEV; | |
97894cda | 105 | |
1da177e4 LT |
106 | if (MTD_ABSENT == mtd->type) { |
107 | put_mtd_device(mtd); | |
108 | return -ENODEV; | |
109 | } | |
110 | ||
1da177e4 LT |
111 | /* You can't open it RW if it's not a writeable device */ |
112 | if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) { | |
113 | put_mtd_device(mtd); | |
114 | return -EACCES; | |
115 | } | |
97894cda | 116 | |
f1a28c02 TG |
117 | mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
118 | if (!mfi) { | |
119 | put_mtd_device(mtd); | |
120 | return -ENOMEM; | |
121 | } | |
122 | mfi->mtd = mtd; | |
123 | file->private_data = mfi; | |
124 | ||
1da177e4 LT |
125 | return 0; |
126 | } /* mtd_open */ | |
127 | ||
128 | /*====================================================================*/ | |
129 | ||
130 | static int mtd_close(struct inode *inode, struct file *file) | |
131 | { | |
f1a28c02 TG |
132 | struct mtd_file_info *mfi = file->private_data; |
133 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
134 | |
135 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); | |
136 | ||
1da177e4 LT |
137 | if (mtd->sync) |
138 | mtd->sync(mtd); | |
97894cda | 139 | |
1da177e4 | 140 | put_mtd_device(mtd); |
f1a28c02 TG |
141 | file->private_data = NULL; |
142 | kfree(mfi); | |
1da177e4 LT |
143 | |
144 | return 0; | |
145 | } /* mtd_close */ | |
146 | ||
147 | /* FIXME: This _really_ needs to die. In 2.5, we should lock the | |
148 | userspace buffer down and use it directly with readv/writev. | |
149 | */ | |
150 | #define MAX_KMALLOC_SIZE 0x20000 | |
151 | ||
152 | static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) | |
153 | { | |
f1a28c02 TG |
154 | struct mtd_file_info *mfi = file->private_data; |
155 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
156 | size_t retlen=0; |
157 | size_t total_retlen=0; | |
158 | int ret=0; | |
159 | int len; | |
160 | char *kbuf; | |
97894cda | 161 | |
1da177e4 LT |
162 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); |
163 | ||
164 | if (*ppos + count > mtd->size) | |
165 | count = mtd->size - *ppos; | |
166 | ||
167 | if (!count) | |
168 | return 0; | |
97894cda | 169 | |
1da177e4 LT |
170 | /* FIXME: Use kiovec in 2.5 to lock down the user's buffers |
171 | and pass them directly to the MTD functions */ | |
b802c074 TG |
172 | |
173 | if (count > MAX_KMALLOC_SIZE) | |
174 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
175 | else | |
176 | kbuf=kmalloc(count, GFP_KERNEL); | |
177 | ||
178 | if (!kbuf) | |
179 | return -ENOMEM; | |
180 | ||
1da177e4 | 181 | while (count) { |
b802c074 | 182 | |
97894cda | 183 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
184 | len = MAX_KMALLOC_SIZE; |
185 | else | |
186 | len = count; | |
187 | ||
f1a28c02 TG |
188 | switch (mfi->mode) { |
189 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
190 | ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); |
191 | break; | |
192 | case MTD_MODE_OTP_USER: | |
193 | ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
194 | break; | |
f1a28c02 TG |
195 | case MTD_MODE_RAW: |
196 | { | |
197 | struct mtd_oob_ops ops; | |
198 | ||
199 | ops.mode = MTD_OOB_RAW; | |
200 | ops.datbuf = kbuf; | |
201 | ops.oobbuf = NULL; | |
202 | ops.len = len; | |
203 | ||
204 | ret = mtd->read_oob(mtd, *ppos, &ops); | |
205 | retlen = ops.retlen; | |
206 | break; | |
207 | } | |
31f4233b | 208 | default: |
f4a43cfc | 209 | ret = mtd->read(mtd, *ppos, len, &retlen, kbuf); |
31f4233b | 210 | } |
1da177e4 LT |
211 | /* Nand returns -EBADMSG on ecc errors, but it returns |
212 | * the data. For our userspace tools it is important | |
97894cda | 213 | * to dump areas with ecc errors ! |
9a1fcdfd TG |
214 | * For kernel internal usage it also might return -EUCLEAN |
215 | * to signal the caller that a bitflip has occured and has | |
216 | * been corrected by the ECC algorithm. | |
1da177e4 LT |
217 | * Userspace software which accesses NAND this way |
218 | * must be aware of the fact that it deals with NAND | |
219 | */ | |
9a1fcdfd | 220 | if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) { |
1da177e4 LT |
221 | *ppos += retlen; |
222 | if (copy_to_user(buf, kbuf, retlen)) { | |
f4a43cfc | 223 | kfree(kbuf); |
1da177e4 LT |
224 | return -EFAULT; |
225 | } | |
226 | else | |
227 | total_retlen += retlen; | |
228 | ||
229 | count -= retlen; | |
230 | buf += retlen; | |
31f4233b NP |
231 | if (retlen == 0) |
232 | count = 0; | |
1da177e4 LT |
233 | } |
234 | else { | |
235 | kfree(kbuf); | |
236 | return ret; | |
237 | } | |
97894cda | 238 | |
1da177e4 LT |
239 | } |
240 | ||
b802c074 | 241 | kfree(kbuf); |
1da177e4 LT |
242 | return total_retlen; |
243 | } /* mtd_read */ | |
244 | ||
245 | static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) | |
246 | { | |
f1a28c02 TG |
247 | struct mtd_file_info *mfi = file->private_data; |
248 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
249 | char *kbuf; |
250 | size_t retlen; | |
251 | size_t total_retlen=0; | |
252 | int ret=0; | |
253 | int len; | |
254 | ||
255 | DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); | |
97894cda | 256 | |
1da177e4 LT |
257 | if (*ppos == mtd->size) |
258 | return -ENOSPC; | |
97894cda | 259 | |
1da177e4 LT |
260 | if (*ppos + count > mtd->size) |
261 | count = mtd->size - *ppos; | |
262 | ||
263 | if (!count) | |
264 | return 0; | |
265 | ||
b802c074 TG |
266 | if (count > MAX_KMALLOC_SIZE) |
267 | kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); | |
268 | else | |
269 | kbuf=kmalloc(count, GFP_KERNEL); | |
270 | ||
271 | if (!kbuf) | |
272 | return -ENOMEM; | |
273 | ||
1da177e4 | 274 | while (count) { |
b802c074 | 275 | |
97894cda | 276 | if (count > MAX_KMALLOC_SIZE) |
1da177e4 LT |
277 | len = MAX_KMALLOC_SIZE; |
278 | else | |
279 | len = count; | |
280 | ||
1da177e4 LT |
281 | if (copy_from_user(kbuf, buf, len)) { |
282 | kfree(kbuf); | |
283 | return -EFAULT; | |
284 | } | |
97894cda | 285 | |
f1a28c02 TG |
286 | switch (mfi->mode) { |
287 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
288 | ret = -EROFS; |
289 | break; | |
290 | case MTD_MODE_OTP_USER: | |
291 | if (!mtd->write_user_prot_reg) { | |
292 | ret = -EOPNOTSUPP; | |
293 | break; | |
294 | } | |
295 | ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); | |
296 | break; | |
f1a28c02 TG |
297 | |
298 | case MTD_MODE_RAW: | |
299 | { | |
300 | struct mtd_oob_ops ops; | |
301 | ||
302 | ops.mode = MTD_OOB_RAW; | |
303 | ops.datbuf = kbuf; | |
304 | ops.oobbuf = NULL; | |
305 | ops.len = len; | |
306 | ||
307 | ret = mtd->write_oob(mtd, *ppos, &ops); | |
308 | retlen = ops.retlen; | |
309 | break; | |
310 | } | |
311 | ||
31f4233b NP |
312 | default: |
313 | ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); | |
314 | } | |
1da177e4 LT |
315 | if (!ret) { |
316 | *ppos += retlen; | |
317 | total_retlen += retlen; | |
318 | count -= retlen; | |
319 | buf += retlen; | |
320 | } | |
321 | else { | |
322 | kfree(kbuf); | |
323 | return ret; | |
324 | } | |
1da177e4 LT |
325 | } |
326 | ||
b802c074 | 327 | kfree(kbuf); |
1da177e4 LT |
328 | return total_retlen; |
329 | } /* mtd_write */ | |
330 | ||
331 | /*====================================================================== | |
332 | ||
333 | IOCTL calls for getting device parameters. | |
334 | ||
335 | ======================================================================*/ | |
336 | static void mtdchar_erase_callback (struct erase_info *instr) | |
337 | { | |
338 | wake_up((wait_queue_head_t *)instr->priv); | |
339 | } | |
340 | ||
f1a28c02 TG |
341 | #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) |
342 | static int otp_select_filemode(struct mtd_file_info *mfi, int mode) | |
343 | { | |
344 | struct mtd_info *mtd = mfi->mtd; | |
345 | int ret = 0; | |
346 | ||
347 | switch (mode) { | |
348 | case MTD_OTP_FACTORY: | |
349 | if (!mtd->read_fact_prot_reg) | |
350 | ret = -EOPNOTSUPP; | |
351 | else | |
352 | mfi->mode = MTD_MODE_OTP_FACTORY; | |
353 | break; | |
354 | case MTD_OTP_USER: | |
355 | if (!mtd->read_fact_prot_reg) | |
356 | ret = -EOPNOTSUPP; | |
357 | else | |
358 | mfi->mode = MTD_MODE_OTP_USER; | |
359 | break; | |
360 | default: | |
361 | ret = -EINVAL; | |
362 | case MTD_OTP_OFF: | |
363 | break; | |
364 | } | |
365 | return ret; | |
366 | } | |
367 | #else | |
368 | # define otp_select_filemode(f,m) -EOPNOTSUPP | |
369 | #endif | |
370 | ||
1da177e4 LT |
371 | static int mtd_ioctl(struct inode *inode, struct file *file, |
372 | u_int cmd, u_long arg) | |
373 | { | |
f1a28c02 TG |
374 | struct mtd_file_info *mfi = file->private_data; |
375 | struct mtd_info *mtd = mfi->mtd; | |
1da177e4 LT |
376 | void __user *argp = (void __user *)arg; |
377 | int ret = 0; | |
378 | u_long size; | |
73c619ea | 379 | struct mtd_info_user info; |
97894cda | 380 | |
1da177e4 LT |
381 | DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); |
382 | ||
383 | size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; | |
384 | if (cmd & IOC_IN) { | |
385 | if (!access_ok(VERIFY_READ, argp, size)) | |
386 | return -EFAULT; | |
387 | } | |
388 | if (cmd & IOC_OUT) { | |
389 | if (!access_ok(VERIFY_WRITE, argp, size)) | |
390 | return -EFAULT; | |
391 | } | |
97894cda | 392 | |
1da177e4 LT |
393 | switch (cmd) { |
394 | case MEMGETREGIONCOUNT: | |
395 | if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) | |
396 | return -EFAULT; | |
397 | break; | |
398 | ||
399 | case MEMGETREGIONINFO: | |
400 | { | |
401 | struct region_info_user ur; | |
402 | ||
403 | if (copy_from_user(&ur, argp, sizeof(struct region_info_user))) | |
404 | return -EFAULT; | |
405 | ||
406 | if (ur.regionindex >= mtd->numeraseregions) | |
407 | return -EINVAL; | |
408 | if (copy_to_user(argp, &(mtd->eraseregions[ur.regionindex]), | |
409 | sizeof(struct mtd_erase_region_info))) | |
410 | return -EFAULT; | |
411 | break; | |
412 | } | |
413 | ||
414 | case MEMGETINFO: | |
73c619ea JE |
415 | info.type = mtd->type; |
416 | info.flags = mtd->flags; | |
417 | info.size = mtd->size; | |
418 | info.erasesize = mtd->erasesize; | |
419 | info.writesize = mtd->writesize; | |
420 | info.oobsize = mtd->oobsize; | |
421 | info.ecctype = mtd->ecctype; | |
422 | info.eccsize = mtd->eccsize; | |
423 | if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) | |
1da177e4 LT |
424 | return -EFAULT; |
425 | break; | |
426 | ||
427 | case MEMERASE: | |
428 | { | |
429 | struct erase_info *erase; | |
430 | ||
431 | if(!(file->f_mode & 2)) | |
432 | return -EPERM; | |
433 | ||
434 | erase=kmalloc(sizeof(struct erase_info),GFP_KERNEL); | |
435 | if (!erase) | |
436 | ret = -ENOMEM; | |
437 | else { | |
438 | wait_queue_head_t waitq; | |
439 | DECLARE_WAITQUEUE(wait, current); | |
440 | ||
441 | init_waitqueue_head(&waitq); | |
442 | ||
443 | memset (erase,0,sizeof(struct erase_info)); | |
444 | if (copy_from_user(&erase->addr, argp, | |
445 | sizeof(struct erase_info_user))) { | |
446 | kfree(erase); | |
447 | return -EFAULT; | |
448 | } | |
449 | erase->mtd = mtd; | |
450 | erase->callback = mtdchar_erase_callback; | |
451 | erase->priv = (unsigned long)&waitq; | |
97894cda | 452 | |
1da177e4 LT |
453 | /* |
454 | FIXME: Allow INTERRUPTIBLE. Which means | |
455 | not having the wait_queue head on the stack. | |
97894cda | 456 | |
1da177e4 LT |
457 | If the wq_head is on the stack, and we |
458 | leave because we got interrupted, then the | |
459 | wq_head is no longer there when the | |
460 | callback routine tries to wake us up. | |
461 | */ | |
462 | ret = mtd->erase(mtd, erase); | |
463 | if (!ret) { | |
464 | set_current_state(TASK_UNINTERRUPTIBLE); | |
465 | add_wait_queue(&waitq, &wait); | |
466 | if (erase->state != MTD_ERASE_DONE && | |
467 | erase->state != MTD_ERASE_FAILED) | |
468 | schedule(); | |
469 | remove_wait_queue(&waitq, &wait); | |
470 | set_current_state(TASK_RUNNING); | |
471 | ||
472 | ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; | |
473 | } | |
474 | kfree(erase); | |
475 | } | |
476 | break; | |
477 | } | |
478 | ||
479 | case MEMWRITEOOB: | |
480 | { | |
481 | struct mtd_oob_buf buf; | |
8593fbc6 | 482 | struct mtd_oob_ops ops; |
97894cda | 483 | |
1da177e4 LT |
484 | if(!(file->f_mode & 2)) |
485 | return -EPERM; | |
486 | ||
487 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
488 | return -EFAULT; | |
97894cda | 489 | |
8593fbc6 | 490 | if (buf.length > 4096) |
1da177e4 LT |
491 | return -EINVAL; |
492 | ||
493 | if (!mtd->write_oob) | |
494 | ret = -EOPNOTSUPP; | |
495 | else | |
496 | ret = access_ok(VERIFY_READ, buf.ptr, | |
497 | buf.length) ? 0 : EFAULT; | |
498 | ||
499 | if (ret) | |
500 | return ret; | |
501 | ||
8593fbc6 | 502 | ops.len = buf.length; |
7bc3312b | 503 | ops.ooblen = buf.length; |
8593fbc6 TG |
504 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
505 | ops.datbuf = NULL; | |
506 | ops.mode = MTD_OOB_PLACE; | |
507 | ||
7bc3312b | 508 | if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
509 | return -EINVAL; |
510 | ||
511 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
512 | if (!ops.oobbuf) | |
1da177e4 | 513 | return -ENOMEM; |
97894cda | 514 | |
8593fbc6 TG |
515 | if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) { |
516 | kfree(ops.oobbuf); | |
1da177e4 LT |
517 | return -EFAULT; |
518 | } | |
519 | ||
8593fbc6 TG |
520 | buf.start &= ~(mtd->oobsize - 1); |
521 | ret = mtd->write_oob(mtd, buf.start, &ops); | |
1da177e4 | 522 | |
8593fbc6 TG |
523 | if (copy_to_user(argp + sizeof(uint32_t), &ops.retlen, |
524 | sizeof(uint32_t))) | |
1da177e4 LT |
525 | ret = -EFAULT; |
526 | ||
8593fbc6 | 527 | kfree(ops.oobbuf); |
1da177e4 LT |
528 | break; |
529 | ||
530 | } | |
531 | ||
532 | case MEMREADOOB: | |
533 | { | |
534 | struct mtd_oob_buf buf; | |
8593fbc6 | 535 | struct mtd_oob_ops ops; |
1da177e4 LT |
536 | |
537 | if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf))) | |
538 | return -EFAULT; | |
97894cda | 539 | |
8593fbc6 | 540 | if (buf.length > 4096) |
1da177e4 LT |
541 | return -EINVAL; |
542 | ||
543 | if (!mtd->read_oob) | |
544 | ret = -EOPNOTSUPP; | |
545 | else | |
546 | ret = access_ok(VERIFY_WRITE, buf.ptr, | |
547 | buf.length) ? 0 : -EFAULT; | |
1da177e4 LT |
548 | if (ret) |
549 | return ret; | |
550 | ||
8593fbc6 | 551 | ops.len = buf.length; |
7bc3312b | 552 | ops.ooblen = buf.length; |
8593fbc6 TG |
553 | ops.ooboffs = buf.start & (mtd->oobsize - 1); |
554 | ops.datbuf = NULL; | |
555 | ops.mode = MTD_OOB_PLACE; | |
556 | ||
7bc3312b | 557 | if (ops.ooboffs && ops.len > (mtd->oobsize - ops.ooboffs)) |
8593fbc6 TG |
558 | return -EINVAL; |
559 | ||
560 | ops.oobbuf = kmalloc(buf.length, GFP_KERNEL); | |
561 | if (!ops.oobbuf) | |
1da177e4 | 562 | return -ENOMEM; |
97894cda | 563 | |
8593fbc6 TG |
564 | buf.start &= ~(mtd->oobsize - 1); |
565 | ret = mtd->read_oob(mtd, buf.start, &ops); | |
1da177e4 | 566 | |
8593fbc6 | 567 | if (put_user(ops.retlen, (uint32_t __user *)argp)) |
1da177e4 | 568 | ret = -EFAULT; |
8593fbc6 TG |
569 | else if (ops.retlen && copy_to_user(buf.ptr, ops.oobbuf, |
570 | ops.retlen)) | |
1da177e4 | 571 | ret = -EFAULT; |
97894cda | 572 | |
8593fbc6 | 573 | kfree(ops.oobbuf); |
1da177e4 LT |
574 | break; |
575 | } | |
576 | ||
577 | case MEMLOCK: | |
578 | { | |
579 | struct erase_info_user info; | |
580 | ||
581 | if (copy_from_user(&info, argp, sizeof(info))) | |
582 | return -EFAULT; | |
583 | ||
584 | if (!mtd->lock) | |
585 | ret = -EOPNOTSUPP; | |
586 | else | |
587 | ret = mtd->lock(mtd, info.start, info.length); | |
588 | break; | |
589 | } | |
590 | ||
591 | case MEMUNLOCK: | |
592 | { | |
593 | struct erase_info_user info; | |
594 | ||
595 | if (copy_from_user(&info, argp, sizeof(info))) | |
596 | return -EFAULT; | |
597 | ||
598 | if (!mtd->unlock) | |
599 | ret = -EOPNOTSUPP; | |
600 | else | |
601 | ret = mtd->unlock(mtd, info.start, info.length); | |
602 | break; | |
603 | } | |
604 | ||
5bd34c09 | 605 | /* Legacy interface */ |
1da177e4 LT |
606 | case MEMGETOOBSEL: |
607 | { | |
5bd34c09 TG |
608 | struct nand_oobinfo oi; |
609 | ||
610 | if (!mtd->ecclayout) | |
611 | return -EOPNOTSUPP; | |
612 | if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) | |
613 | return -EINVAL; | |
614 | ||
615 | oi.useecc = MTD_NANDECC_AUTOPLACE; | |
616 | memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); | |
617 | memcpy(&oi.oobfree, mtd->ecclayout->oobfree, | |
618 | sizeof(oi.oobfree)); | |
619 | ||
620 | if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) | |
1da177e4 LT |
621 | return -EFAULT; |
622 | break; | |
623 | } | |
624 | ||
625 | case MEMGETBADBLOCK: | |
626 | { | |
627 | loff_t offs; | |
97894cda | 628 | |
1da177e4 LT |
629 | if (copy_from_user(&offs, argp, sizeof(loff_t))) |
630 | return -EFAULT; | |
631 | if (!mtd->block_isbad) | |
632 | ret = -EOPNOTSUPP; | |
633 | else | |
634 | return mtd->block_isbad(mtd, offs); | |
635 | break; | |
636 | } | |
637 | ||
638 | case MEMSETBADBLOCK: | |
639 | { | |
640 | loff_t offs; | |
641 | ||
642 | if (copy_from_user(&offs, argp, sizeof(loff_t))) | |
643 | return -EFAULT; | |
644 | if (!mtd->block_markbad) | |
645 | ret = -EOPNOTSUPP; | |
646 | else | |
647 | return mtd->block_markbad(mtd, offs); | |
648 | break; | |
649 | } | |
650 | ||
493c6460 | 651 | #if defined(CONFIG_MTD_OTP) || defined(CONFIG_MTD_ONENAND_OTP) |
31f4233b NP |
652 | case OTPSELECT: |
653 | { | |
654 | int mode; | |
655 | if (copy_from_user(&mode, argp, sizeof(int))) | |
656 | return -EFAULT; | |
f1a28c02 TG |
657 | |
658 | mfi->mode = MTD_MODE_NORMAL; | |
659 | ||
660 | ret = otp_select_filemode(mfi, mode); | |
661 | ||
81dba488 | 662 | file->f_pos = 0; |
31f4233b NP |
663 | break; |
664 | } | |
665 | ||
666 | case OTPGETREGIONCOUNT: | |
667 | case OTPGETREGIONINFO: | |
668 | { | |
669 | struct otp_info *buf = kmalloc(4096, GFP_KERNEL); | |
670 | if (!buf) | |
671 | return -ENOMEM; | |
672 | ret = -EOPNOTSUPP; | |
f1a28c02 TG |
673 | switch (mfi->mode) { |
674 | case MTD_MODE_OTP_FACTORY: | |
31f4233b NP |
675 | if (mtd->get_fact_prot_info) |
676 | ret = mtd->get_fact_prot_info(mtd, buf, 4096); | |
677 | break; | |
678 | case MTD_MODE_OTP_USER: | |
679 | if (mtd->get_user_prot_info) | |
680 | ret = mtd->get_user_prot_info(mtd, buf, 4096); | |
681 | break; | |
f1a28c02 TG |
682 | default: |
683 | break; | |
31f4233b NP |
684 | } |
685 | if (ret >= 0) { | |
686 | if (cmd == OTPGETREGIONCOUNT) { | |
687 | int nbr = ret / sizeof(struct otp_info); | |
688 | ret = copy_to_user(argp, &nbr, sizeof(int)); | |
689 | } else | |
690 | ret = copy_to_user(argp, buf, ret); | |
691 | if (ret) | |
692 | ret = -EFAULT; | |
693 | } | |
694 | kfree(buf); | |
695 | break; | |
696 | } | |
697 | ||
698 | case OTPLOCK: | |
699 | { | |
700 | struct otp_info info; | |
701 | ||
f1a28c02 | 702 | if (mfi->mode != MTD_MODE_OTP_USER) |
31f4233b NP |
703 | return -EINVAL; |
704 | if (copy_from_user(&info, argp, sizeof(info))) | |
705 | return -EFAULT; | |
706 | if (!mtd->lock_user_prot_reg) | |
707 | return -EOPNOTSUPP; | |
708 | ret = mtd->lock_user_prot_reg(mtd, info.start, info.length); | |
709 | break; | |
710 | } | |
711 | #endif | |
712 | ||
f1a28c02 TG |
713 | case ECCGETLAYOUT: |
714 | { | |
715 | if (!mtd->ecclayout) | |
716 | return -EOPNOTSUPP; | |
717 | ||
718 | if (copy_to_user(argp, &mtd->ecclayout, | |
719 | sizeof(struct nand_ecclayout))) | |
720 | return -EFAULT; | |
721 | break; | |
722 | } | |
723 | ||
724 | case ECCGETSTATS: | |
725 | { | |
726 | if (copy_to_user(argp, &mtd->ecc_stats, | |
727 | sizeof(struct mtd_ecc_stats))) | |
728 | return -EFAULT; | |
729 | break; | |
730 | } | |
731 | ||
732 | case MTDFILEMODE: | |
733 | { | |
734 | mfi->mode = 0; | |
735 | ||
736 | switch(arg) { | |
737 | case MTD_MODE_OTP_FACTORY: | |
738 | case MTD_MODE_OTP_USER: | |
739 | ret = otp_select_filemode(mfi, arg); | |
740 | break; | |
741 | ||
742 | case MTD_MODE_RAW: | |
743 | if (!mtd->read_oob || !mtd->write_oob) | |
744 | return -EOPNOTSUPP; | |
745 | mfi->mode = arg; | |
746 | ||
747 | case MTD_MODE_NORMAL: | |
748 | break; | |
749 | default: | |
750 | ret = -EINVAL; | |
751 | } | |
752 | file->f_pos = 0; | |
753 | break; | |
754 | } | |
755 | ||
1da177e4 LT |
756 | default: |
757 | ret = -ENOTTY; | |
758 | } | |
759 | ||
760 | return ret; | |
761 | } /* memory_ioctl */ | |
762 | ||
763 | static struct file_operations mtd_fops = { | |
764 | .owner = THIS_MODULE, | |
765 | .llseek = mtd_lseek, | |
766 | .read = mtd_read, | |
767 | .write = mtd_write, | |
768 | .ioctl = mtd_ioctl, | |
769 | .open = mtd_open, | |
770 | .release = mtd_close, | |
771 | }; | |
772 | ||
773 | static int __init init_mtdchar(void) | |
774 | { | |
775 | if (register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops)) { | |
776 | printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n", | |
777 | MTD_CHAR_MAJOR); | |
778 | return -EAGAIN; | |
779 | } | |
780 | ||
9bc7b387 TP |
781 | mtd_class = class_create(THIS_MODULE, "mtd"); |
782 | ||
783 | if (IS_ERR(mtd_class)) { | |
784 | printk(KERN_ERR "Error creating mtd class.\n"); | |
785 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); | |
3a7a8824 | 786 | return PTR_ERR(mtd_class); |
9bc7b387 TP |
787 | } |
788 | ||
789 | register_mtd_user(¬ifier); | |
1da177e4 LT |
790 | return 0; |
791 | } | |
792 | ||
793 | static void __exit cleanup_mtdchar(void) | |
794 | { | |
9bc7b387 TP |
795 | unregister_mtd_user(¬ifier); |
796 | class_destroy(mtd_class); | |
1da177e4 LT |
797 | unregister_chrdev(MTD_CHAR_MAJOR, "mtd"); |
798 | } | |
799 | ||
800 | module_init(init_mtdchar); | |
801 | module_exit(cleanup_mtdchar); | |
802 | ||
803 | ||
804 | MODULE_LICENSE("GPL"); | |
805 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
806 | MODULE_DESCRIPTION("Direct character-device access to MTD devices"); |