Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Core registration and callback routines for MTD |
3 | * drivers and users. | |
4 | * | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/kernel.h> | |
1da177e4 LT |
9 | #include <linux/ptrace.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/timer.h> | |
13 | #include <linux/major.h> | |
14 | #include <linux/fs.h> | |
7799308f | 15 | #include <linux/err.h> |
1da177e4 LT |
16 | #include <linux/ioctl.h> |
17 | #include <linux/init.h> | |
18 | #include <linux/mtd/compatmac.h> | |
1da177e4 | 19 | #include <linux/proc_fs.h> |
1da177e4 LT |
20 | |
21 | #include <linux/mtd/mtd.h> | |
402d3265 | 22 | #include "internal.h" |
1da177e4 | 23 | |
356d70f1 BD |
24 | #include "mtdcore.h" |
25 | ||
1f24b5a8 DB |
26 | |
27 | static struct class *mtd_class; | |
28 | ||
97894cda | 29 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 30 | should not use them for _anything_ else */ |
48b19268 | 31 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 LT |
32 | struct mtd_info *mtd_table[MAX_MTD_DEVICES]; |
33 | ||
34 | EXPORT_SYMBOL_GPL(mtd_table_mutex); | |
35 | EXPORT_SYMBOL_GPL(mtd_table); | |
36 | ||
37 | static LIST_HEAD(mtd_notifiers); | |
38 | ||
1f24b5a8 DB |
39 | |
40 | #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) | |
41 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) | |
42 | #else | |
43 | #define MTD_DEVT(index) 0 | |
44 | #endif | |
45 | ||
46 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
47 | * the mtd_info will probably want to use the release() hook... | |
48 | */ | |
49 | static void mtd_release(struct device *dev) | |
50 | { | |
51 | struct mtd_info *mtd = dev_to_mtd(dev); | |
52 | ||
53 | /* remove /dev/mtdXro node if needed */ | |
54 | if (MTD_DEVT(mtd->index)) | |
55 | device_destroy(mtd_class, MTD_DEVT(mtd->index) + 1); | |
56 | } | |
57 | ||
58 | static ssize_t mtd_type_show(struct device *dev, | |
59 | struct device_attribute *attr, char *buf) | |
60 | { | |
61 | struct mtd_info *mtd = dev_to_mtd(dev); | |
62 | char *type; | |
63 | ||
64 | switch (mtd->type) { | |
65 | case MTD_ABSENT: | |
66 | type = "absent"; | |
67 | break; | |
68 | case MTD_RAM: | |
69 | type = "ram"; | |
70 | break; | |
71 | case MTD_ROM: | |
72 | type = "rom"; | |
73 | break; | |
74 | case MTD_NORFLASH: | |
75 | type = "nor"; | |
76 | break; | |
77 | case MTD_NANDFLASH: | |
78 | type = "nand"; | |
79 | break; | |
80 | case MTD_DATAFLASH: | |
81 | type = "dataflash"; | |
82 | break; | |
83 | case MTD_UBIVOLUME: | |
84 | type = "ubi"; | |
85 | break; | |
86 | default: | |
87 | type = "unknown"; | |
88 | } | |
89 | ||
90 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
91 | } | |
694bb7fc KC |
92 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
93 | ||
94 | static ssize_t mtd_flags_show(struct device *dev, | |
95 | struct device_attribute *attr, char *buf) | |
96 | { | |
97 | struct mtd_info *mtd = dev_to_mtd(dev); | |
98 | ||
99 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
100 | ||
101 | } | |
102 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
103 | ||
104 | static ssize_t mtd_size_show(struct device *dev, | |
105 | struct device_attribute *attr, char *buf) | |
106 | { | |
107 | struct mtd_info *mtd = dev_to_mtd(dev); | |
108 | ||
109 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
110 | (unsigned long long)mtd->size); | |
111 | ||
112 | } | |
113 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
114 | ||
115 | static ssize_t mtd_erasesize_show(struct device *dev, | |
116 | struct device_attribute *attr, char *buf) | |
117 | { | |
118 | struct mtd_info *mtd = dev_to_mtd(dev); | |
119 | ||
120 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
121 | ||
122 | } | |
123 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
124 | ||
125 | static ssize_t mtd_writesize_show(struct device *dev, | |
126 | struct device_attribute *attr, char *buf) | |
127 | { | |
128 | struct mtd_info *mtd = dev_to_mtd(dev); | |
129 | ||
130 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
131 | ||
132 | } | |
133 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
134 | ||
135 | static ssize_t mtd_oobsize_show(struct device *dev, | |
136 | struct device_attribute *attr, char *buf) | |
137 | { | |
138 | struct mtd_info *mtd = dev_to_mtd(dev); | |
139 | ||
140 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
141 | ||
142 | } | |
143 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
144 | ||
145 | static ssize_t mtd_numeraseregions_show(struct device *dev, | |
146 | struct device_attribute *attr, char *buf) | |
147 | { | |
148 | struct mtd_info *mtd = dev_to_mtd(dev); | |
149 | ||
150 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
151 | ||
152 | } | |
153 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
154 | NULL); | |
155 | ||
156 | static ssize_t mtd_name_show(struct device *dev, | |
157 | struct device_attribute *attr, char *buf) | |
158 | { | |
159 | struct mtd_info *mtd = dev_to_mtd(dev); | |
160 | ||
161 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
162 | ||
163 | } | |
164 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
1f24b5a8 DB |
165 | |
166 | static struct attribute *mtd_attrs[] = { | |
694bb7fc KC |
167 | &dev_attr_type.attr, |
168 | &dev_attr_flags.attr, | |
169 | &dev_attr_size.attr, | |
170 | &dev_attr_erasesize.attr, | |
171 | &dev_attr_writesize.attr, | |
172 | &dev_attr_oobsize.attr, | |
173 | &dev_attr_numeraseregions.attr, | |
174 | &dev_attr_name.attr, | |
1f24b5a8 DB |
175 | NULL, |
176 | }; | |
177 | ||
178 | struct attribute_group mtd_group = { | |
179 | .attrs = mtd_attrs, | |
180 | }; | |
181 | ||
182 | struct attribute_group *mtd_groups[] = { | |
183 | &mtd_group, | |
184 | NULL, | |
185 | }; | |
186 | ||
187 | static struct device_type mtd_devtype = { | |
188 | .name = "mtd", | |
189 | .groups = mtd_groups, | |
190 | .release = mtd_release, | |
191 | }; | |
192 | ||
1da177e4 LT |
193 | /** |
194 | * add_mtd_device - register an MTD device | |
195 | * @mtd: pointer to new MTD device info structure | |
196 | * | |
197 | * Add a device to the list of MTD devices present in the system, and | |
198 | * notify each currently active MTD 'user' of its arrival. Returns | |
199 | * zero on success or 1 on failure, which currently will only happen | |
200 | * if the number of present devices exceeds MAX_MTD_DEVICES (i.e. 16) | |
1f24b5a8 | 201 | * or there's a sysfs error. |
1da177e4 LT |
202 | */ |
203 | ||
204 | int add_mtd_device(struct mtd_info *mtd) | |
205 | { | |
206 | int i; | |
207 | ||
402d3265 DH |
208 | if (!mtd->backing_dev_info) { |
209 | switch (mtd->type) { | |
210 | case MTD_RAM: | |
211 | mtd->backing_dev_info = &mtd_bdi_rw_mappable; | |
212 | break; | |
213 | case MTD_ROM: | |
214 | mtd->backing_dev_info = &mtd_bdi_ro_mappable; | |
215 | break; | |
216 | default: | |
217 | mtd->backing_dev_info = &mtd_bdi_unmappable; | |
218 | break; | |
219 | } | |
220 | } | |
221 | ||
783ed81f | 222 | BUG_ON(mtd->writesize == 0); |
48b19268 | 223 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
224 | |
225 | for (i=0; i < MAX_MTD_DEVICES; i++) | |
226 | if (!mtd_table[i]) { | |
2606c797 | 227 | struct mtd_notifier *not; |
1da177e4 LT |
228 | |
229 | mtd_table[i] = mtd; | |
230 | mtd->index = i; | |
231 | mtd->usecount = 0; | |
232 | ||
69423d99 AH |
233 | if (is_power_of_2(mtd->erasesize)) |
234 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
235 | else | |
236 | mtd->erasesize_shift = 0; | |
237 | ||
238 | if (is_power_of_2(mtd->writesize)) | |
239 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
240 | else | |
241 | mtd->writesize_shift = 0; | |
242 | ||
243 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
244 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
245 | ||
187ef152 HS |
246 | /* Some chips always power up locked. Unlock them now */ |
247 | if ((mtd->flags & MTD_WRITEABLE) | |
e619a75f | 248 | && (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) { |
187ef152 HS |
249 | if (mtd->unlock(mtd, 0, mtd->size)) |
250 | printk(KERN_WARNING | |
251 | "%s: unlock failed, " | |
252 | "writes may not work\n", | |
253 | mtd->name); | |
254 | } | |
255 | ||
1f24b5a8 DB |
256 | /* Caller should have set dev.parent to match the |
257 | * physical device. | |
258 | */ | |
259 | mtd->dev.type = &mtd_devtype; | |
260 | mtd->dev.class = mtd_class; | |
261 | mtd->dev.devt = MTD_DEVT(i); | |
262 | dev_set_name(&mtd->dev, "mtd%d", i); | |
263 | if (device_register(&mtd->dev) != 0) { | |
264 | mtd_table[i] = NULL; | |
265 | break; | |
266 | } | |
267 | ||
268 | if (MTD_DEVT(i)) | |
269 | device_create(mtd_class, mtd->dev.parent, | |
270 | MTD_DEVT(i) + 1, | |
271 | NULL, "mtd%dro", i); | |
272 | ||
1da177e4 LT |
273 | DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name); |
274 | /* No need to get a refcount on the module containing | |
275 | the notifier, since we hold the mtd_table_mutex */ | |
71a928c0 | 276 | list_for_each_entry(not, &mtd_notifiers, list) |
1da177e4 | 277 | not->add(mtd); |
97894cda | 278 | |
48b19268 | 279 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
280 | /* We _know_ we aren't being removed, because |
281 | our caller is still holding us here. So none | |
282 | of this try_ nonsense, and no bitching about it | |
283 | either. :) */ | |
284 | __module_get(THIS_MODULE); | |
285 | return 0; | |
286 | } | |
97894cda | 287 | |
48b19268 | 288 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
289 | return 1; |
290 | } | |
291 | ||
292 | /** | |
293 | * del_mtd_device - unregister an MTD device | |
294 | * @mtd: pointer to MTD device info structure | |
295 | * | |
296 | * Remove a device from the list of MTD devices present in the system, | |
297 | * and notify each currently active MTD 'user' of its departure. | |
298 | * Returns zero on success or 1 on failure, which currently will happen | |
299 | * if the requested device does not appear to be present in the list. | |
300 | */ | |
301 | ||
302 | int del_mtd_device (struct mtd_info *mtd) | |
303 | { | |
304 | int ret; | |
97894cda | 305 | |
48b19268 | 306 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
307 | |
308 | if (mtd_table[mtd->index] != mtd) { | |
309 | ret = -ENODEV; | |
310 | } else if (mtd->usecount) { | |
97894cda | 311 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
1da177e4 LT |
312 | mtd->index, mtd->name, mtd->usecount); |
313 | ret = -EBUSY; | |
314 | } else { | |
856613c9 | 315 | struct mtd_notifier *not; |
1da177e4 | 316 | |
694bb7fc KC |
317 | device_unregister(&mtd->dev); |
318 | ||
1da177e4 LT |
319 | /* No need to get a refcount on the module containing |
320 | the notifier, since we hold the mtd_table_mutex */ | |
71a928c0 | 321 | list_for_each_entry(not, &mtd_notifiers, list) |
1da177e4 | 322 | not->remove(mtd); |
1da177e4 LT |
323 | |
324 | mtd_table[mtd->index] = NULL; | |
325 | ||
326 | module_put(THIS_MODULE); | |
327 | ret = 0; | |
328 | } | |
329 | ||
48b19268 | 330 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
331 | return ret; |
332 | } | |
333 | ||
334 | /** | |
335 | * register_mtd_user - register a 'user' of MTD devices. | |
336 | * @new: pointer to notifier info structure | |
337 | * | |
338 | * Registers a pair of callbacks function to be called upon addition | |
339 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
340 | * invoked for each MTD device currently present in the system. | |
341 | */ | |
342 | ||
343 | void register_mtd_user (struct mtd_notifier *new) | |
344 | { | |
345 | int i; | |
346 | ||
48b19268 | 347 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
348 | |
349 | list_add(&new->list, &mtd_notifiers); | |
350 | ||
351 | __module_get(THIS_MODULE); | |
97894cda | 352 | |
1da177e4 LT |
353 | for (i=0; i< MAX_MTD_DEVICES; i++) |
354 | if (mtd_table[i]) | |
355 | new->add(mtd_table[i]); | |
356 | ||
48b19268 | 357 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
358 | } |
359 | ||
360 | /** | |
49450795 AB |
361 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
362 | * @old: pointer to notifier info structure | |
1da177e4 LT |
363 | * |
364 | * Removes a callback function pair from the list of 'users' to be | |
365 | * notified upon addition or removal of MTD devices. Causes the | |
366 | * 'remove' callback to be immediately invoked for each MTD device | |
367 | * currently present in the system. | |
368 | */ | |
369 | ||
370 | int unregister_mtd_user (struct mtd_notifier *old) | |
371 | { | |
372 | int i; | |
373 | ||
48b19268 | 374 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
375 | |
376 | module_put(THIS_MODULE); | |
377 | ||
378 | for (i=0; i< MAX_MTD_DEVICES; i++) | |
379 | if (mtd_table[i]) | |
380 | old->remove(mtd_table[i]); | |
97894cda | 381 | |
1da177e4 | 382 | list_del(&old->list); |
48b19268 | 383 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
384 | return 0; |
385 | } | |
386 | ||
387 | ||
388 | /** | |
389 | * get_mtd_device - obtain a validated handle for an MTD device | |
390 | * @mtd: last known address of the required MTD device | |
391 | * @num: internal device number of the required MTD device | |
392 | * | |
393 | * Given a number and NULL address, return the num'th entry in the device | |
394 | * table, if any. Given an address and num == -1, search the device table | |
395 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
396 | * both, return the num'th driver only if its address matches. Return |
397 | * error code if not. | |
1da177e4 | 398 | */ |
97894cda | 399 | |
1da177e4 LT |
400 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
401 | { | |
402 | struct mtd_info *ret = NULL; | |
9c74034f | 403 | int i, err = -ENODEV; |
1da177e4 | 404 | |
48b19268 | 405 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
406 | |
407 | if (num == -1) { | |
408 | for (i=0; i< MAX_MTD_DEVICES; i++) | |
409 | if (mtd_table[i] == mtd) | |
410 | ret = mtd_table[i]; | |
411 | } else if (num < MAX_MTD_DEVICES) { | |
412 | ret = mtd_table[num]; | |
413 | if (mtd && mtd != ret) | |
414 | ret = NULL; | |
415 | } | |
416 | ||
9fe912ce AB |
417 | if (!ret) |
418 | goto out_unlock; | |
419 | ||
9c74034f | 420 | if (!try_module_get(ret->owner)) |
9fe912ce | 421 | goto out_unlock; |
9fe912ce | 422 | |
9c74034f AB |
423 | if (ret->get_device) { |
424 | err = ret->get_device(ret); | |
425 | if (err) | |
426 | goto out_put; | |
9fe912ce | 427 | } |
1da177e4 | 428 | |
9fe912ce | 429 | ret->usecount++; |
9c74034f AB |
430 | mutex_unlock(&mtd_table_mutex); |
431 | return ret; | |
1da177e4 | 432 | |
9c74034f AB |
433 | out_put: |
434 | module_put(ret->owner); | |
9fe912ce | 435 | out_unlock: |
48b19268 | 436 | mutex_unlock(&mtd_table_mutex); |
9c74034f | 437 | return ERR_PTR(err); |
1da177e4 LT |
438 | } |
439 | ||
7799308f AB |
440 | /** |
441 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
442 | * device name | |
443 | * @name: MTD device name to open | |
444 | * | |
445 | * This function returns MTD device description structure in case of | |
446 | * success and an error code in case of failure. | |
447 | */ | |
448 | ||
449 | struct mtd_info *get_mtd_device_nm(const char *name) | |
450 | { | |
9fe912ce AB |
451 | int i, err = -ENODEV; |
452 | struct mtd_info *mtd = NULL; | |
7799308f AB |
453 | |
454 | mutex_lock(&mtd_table_mutex); | |
455 | ||
456 | for (i = 0; i < MAX_MTD_DEVICES; i++) { | |
457 | if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) { | |
458 | mtd = mtd_table[i]; | |
459 | break; | |
460 | } | |
461 | } | |
462 | ||
9fe912ce | 463 | if (!mtd) |
7799308f AB |
464 | goto out_unlock; |
465 | ||
466 | if (!try_module_get(mtd->owner)) | |
467 | goto out_unlock; | |
468 | ||
9fe912ce AB |
469 | if (mtd->get_device) { |
470 | err = mtd->get_device(mtd); | |
471 | if (err) | |
472 | goto out_put; | |
473 | } | |
474 | ||
7799308f | 475 | mtd->usecount++; |
9fe912ce AB |
476 | mutex_unlock(&mtd_table_mutex); |
477 | return mtd; | |
7799308f | 478 | |
9fe912ce AB |
479 | out_put: |
480 | module_put(mtd->owner); | |
7799308f AB |
481 | out_unlock: |
482 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 483 | return ERR_PTR(err); |
7799308f AB |
484 | } |
485 | ||
1da177e4 LT |
486 | void put_mtd_device(struct mtd_info *mtd) |
487 | { | |
488 | int c; | |
489 | ||
48b19268 | 490 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 491 | c = --mtd->usecount; |
9fe912ce AB |
492 | if (mtd->put_device) |
493 | mtd->put_device(mtd); | |
48b19268 | 494 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
495 | BUG_ON(c < 0); |
496 | ||
497 | module_put(mtd->owner); | |
498 | } | |
499 | ||
500 | /* default_mtd_writev - default mtd writev method for MTD devices that | |
dd36f267 | 501 | * don't implement their own |
1da177e4 LT |
502 | */ |
503 | ||
504 | int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
505 | unsigned long count, loff_t to, size_t *retlen) | |
506 | { | |
507 | unsigned long i; | |
508 | size_t totlen = 0, thislen; | |
509 | int ret = 0; | |
510 | ||
511 | if(!mtd->write) { | |
512 | ret = -EROFS; | |
513 | } else { | |
514 | for (i=0; i<count; i++) { | |
515 | if (!vecs[i].iov_len) | |
516 | continue; | |
517 | ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); | |
518 | totlen += thislen; | |
519 | if (ret || thislen != vecs[i].iov_len) | |
520 | break; | |
521 | to += vecs[i].iov_len; | |
522 | } | |
523 | } | |
524 | if (retlen) | |
525 | *retlen = totlen; | |
526 | return ret; | |
527 | } | |
528 | ||
dd36f267 DW |
529 | EXPORT_SYMBOL_GPL(add_mtd_device); |
530 | EXPORT_SYMBOL_GPL(del_mtd_device); | |
531 | EXPORT_SYMBOL_GPL(get_mtd_device); | |
532 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); | |
533 | EXPORT_SYMBOL_GPL(put_mtd_device); | |
534 | EXPORT_SYMBOL_GPL(register_mtd_user); | |
535 | EXPORT_SYMBOL_GPL(unregister_mtd_user); | |
536 | EXPORT_SYMBOL_GPL(default_mtd_writev); | |
1da177e4 | 537 | |
2d2dce0e PM |
538 | #ifdef CONFIG_PROC_FS |
539 | ||
1da177e4 LT |
540 | /*====================================================================*/ |
541 | /* Support for /proc/mtd */ | |
542 | ||
1da177e4 LT |
543 | static struct proc_dir_entry *proc_mtd; |
544 | ||
545 | static inline int mtd_proc_info (char *buf, int i) | |
546 | { | |
547 | struct mtd_info *this = mtd_table[i]; | |
548 | ||
549 | if (!this) | |
550 | return 0; | |
551 | ||
69423d99 AH |
552 | return sprintf(buf, "mtd%d: %8.8llx %8.8x \"%s\"\n", i, |
553 | (unsigned long long)this->size, | |
1da177e4 LT |
554 | this->erasesize, this->name); |
555 | } | |
556 | ||
557 | static int mtd_read_proc (char *page, char **start, off_t off, int count, | |
558 | int *eof, void *data_unused) | |
559 | { | |
560 | int len, l, i; | |
561 | off_t begin = 0; | |
562 | ||
48b19268 | 563 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
564 | |
565 | len = sprintf(page, "dev: size erasesize name\n"); | |
566 | for (i=0; i< MAX_MTD_DEVICES; i++) { | |
567 | ||
568 | l = mtd_proc_info(page + len, i); | |
569 | len += l; | |
570 | if (len+begin > off+count) | |
571 | goto done; | |
572 | if (len+begin < off) { | |
573 | begin += len; | |
574 | len = 0; | |
575 | } | |
576 | } | |
577 | ||
578 | *eof = 1; | |
579 | ||
580 | done: | |
48b19268 | 581 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
582 | if (off >= len+begin) |
583 | return 0; | |
584 | *start = page + (off-begin); | |
585 | return ((count < begin+len-off) ? count : begin+len-off); | |
586 | } | |
587 | ||
45b09076 KC |
588 | #endif /* CONFIG_PROC_FS */ |
589 | ||
1da177e4 LT |
590 | /*====================================================================*/ |
591 | /* Init code */ | |
592 | ||
593 | static int __init init_mtd(void) | |
594 | { | |
694bb7fc KC |
595 | mtd_class = class_create(THIS_MODULE, "mtd"); |
596 | ||
597 | if (IS_ERR(mtd_class)) { | |
598 | pr_err("Error creating mtd class.\n"); | |
599 | return PTR_ERR(mtd_class); | |
600 | } | |
45b09076 | 601 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
602 | if ((proc_mtd = create_proc_entry( "mtd", 0, NULL ))) |
603 | proc_mtd->read_proc = mtd_read_proc; | |
45b09076 | 604 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
605 | return 0; |
606 | } | |
607 | ||
608 | static void __exit cleanup_mtd(void) | |
609 | { | |
45b09076 | 610 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
611 | if (proc_mtd) |
612 | remove_proc_entry( "mtd", NULL); | |
45b09076 | 613 | #endif /* CONFIG_PROC_FS */ |
694bb7fc | 614 | class_destroy(mtd_class); |
1da177e4 LT |
615 | } |
616 | ||
617 | module_init(init_mtd); | |
618 | module_exit(cleanup_mtd); | |
619 | ||
1da177e4 LT |
620 | MODULE_LICENSE("GPL"); |
621 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
622 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |