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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | * Core registration and callback routines for MTD |
3 | * drivers and users. | |
4 | * | |
a33eb6b9 JE |
5 | * bdi bits are: |
6 | * Copyright © 2006 Red Hat, Inc. All Rights Reserved. | |
7 | * Written by David Howells (dhowells@redhat.com) | |
1da177e4 LT |
8 | */ |
9 | ||
1da177e4 LT |
10 | #include <linux/module.h> |
11 | #include <linux/kernel.h> | |
1da177e4 | 12 | #include <linux/ptrace.h> |
1da177e4 LT |
13 | #include <linux/string.h> |
14 | #include <linux/timer.h> | |
15 | #include <linux/major.h> | |
16 | #include <linux/fs.h> | |
7799308f | 17 | #include <linux/err.h> |
1da177e4 LT |
18 | #include <linux/ioctl.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/mtd/compatmac.h> | |
1da177e4 | 21 | #include <linux/proc_fs.h> |
b520e412 | 22 | #include <linux/idr.h> |
a33eb6b9 | 23 | #include <linux/backing-dev.h> |
05d71b46 | 24 | #include <linux/gfp.h> |
1da177e4 LT |
25 | |
26 | #include <linux/mtd/mtd.h> | |
27 | ||
356d70f1 | 28 | #include "mtdcore.h" |
a33eb6b9 JE |
29 | /* |
30 | * backing device capabilities for non-mappable devices (such as NAND flash) | |
31 | * - permits private mappings, copies are taken of the data | |
32 | */ | |
33 | struct backing_dev_info mtd_bdi_unmappable = { | |
34 | .capabilities = BDI_CAP_MAP_COPY, | |
35 | }; | |
36 | ||
37 | /* | |
38 | * backing device capabilities for R/O mappable devices (such as ROM) | |
39 | * - permits private mappings, copies are taken of the data | |
40 | * - permits non-writable shared mappings | |
41 | */ | |
42 | struct backing_dev_info mtd_bdi_ro_mappable = { | |
43 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | | |
44 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), | |
45 | }; | |
46 | ||
47 | /* | |
48 | * backing device capabilities for writable mappable devices (such as RAM) | |
49 | * - permits private mappings, copies are taken of the data | |
50 | * - permits non-writable shared mappings | |
51 | */ | |
52 | struct backing_dev_info mtd_bdi_rw_mappable = { | |
53 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | | |
54 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | | |
55 | BDI_CAP_WRITE_MAP), | |
56 | }; | |
356d70f1 | 57 | |
15bce40c DW |
58 | static int mtd_cls_suspend(struct device *dev, pm_message_t state); |
59 | static int mtd_cls_resume(struct device *dev); | |
60 | ||
61 | static struct class mtd_class = { | |
62 | .name = "mtd", | |
63 | .owner = THIS_MODULE, | |
64 | .suspend = mtd_cls_suspend, | |
65 | .resume = mtd_cls_resume, | |
66 | }; | |
1f24b5a8 | 67 | |
b520e412 BH |
68 | static DEFINE_IDR(mtd_idr); |
69 | ||
97894cda | 70 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 71 | should not use them for _anything_ else */ |
48b19268 | 72 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 | 73 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
b520e412 BH |
74 | |
75 | struct mtd_info *__mtd_next_device(int i) | |
76 | { | |
77 | return idr_get_next(&mtd_idr, &i); | |
78 | } | |
79 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
1da177e4 LT |
80 | |
81 | static LIST_HEAD(mtd_notifiers); | |
82 | ||
1f24b5a8 DB |
83 | |
84 | #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) | |
85 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) | |
86 | #else | |
87 | #define MTD_DEVT(index) 0 | |
88 | #endif | |
89 | ||
90 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
91 | * the mtd_info will probably want to use the release() hook... | |
92 | */ | |
93 | static void mtd_release(struct device *dev) | |
94 | { | |
2fdb1144 | 95 | dev_t index = MTD_DEVT(dev_to_mtd(dev)->index); |
1f24b5a8 DB |
96 | |
97 | /* remove /dev/mtdXro node if needed */ | |
2fdb1144 | 98 | if (index) |
15bce40c DW |
99 | device_destroy(&mtd_class, index + 1); |
100 | } | |
101 | ||
102 | static int mtd_cls_suspend(struct device *dev, pm_message_t state) | |
103 | { | |
104 | struct mtd_info *mtd = dev_to_mtd(dev); | |
6afc4fdb SB |
105 | |
106 | if (mtd && mtd->suspend) | |
15bce40c DW |
107 | return mtd->suspend(mtd); |
108 | else | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static int mtd_cls_resume(struct device *dev) | |
113 | { | |
114 | struct mtd_info *mtd = dev_to_mtd(dev); | |
115 | ||
6afc4fdb | 116 | if (mtd && mtd->resume) |
15bce40c DW |
117 | mtd->resume(mtd); |
118 | return 0; | |
1f24b5a8 DB |
119 | } |
120 | ||
121 | static ssize_t mtd_type_show(struct device *dev, | |
122 | struct device_attribute *attr, char *buf) | |
123 | { | |
124 | struct mtd_info *mtd = dev_to_mtd(dev); | |
125 | char *type; | |
126 | ||
127 | switch (mtd->type) { | |
128 | case MTD_ABSENT: | |
129 | type = "absent"; | |
130 | break; | |
131 | case MTD_RAM: | |
132 | type = "ram"; | |
133 | break; | |
134 | case MTD_ROM: | |
135 | type = "rom"; | |
136 | break; | |
137 | case MTD_NORFLASH: | |
138 | type = "nor"; | |
139 | break; | |
140 | case MTD_NANDFLASH: | |
141 | type = "nand"; | |
142 | break; | |
143 | case MTD_DATAFLASH: | |
144 | type = "dataflash"; | |
145 | break; | |
146 | case MTD_UBIVOLUME: | |
147 | type = "ubi"; | |
148 | break; | |
149 | default: | |
150 | type = "unknown"; | |
151 | } | |
152 | ||
153 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
154 | } | |
694bb7fc KC |
155 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
156 | ||
157 | static ssize_t mtd_flags_show(struct device *dev, | |
158 | struct device_attribute *attr, char *buf) | |
159 | { | |
160 | struct mtd_info *mtd = dev_to_mtd(dev); | |
161 | ||
162 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
163 | ||
164 | } | |
165 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
166 | ||
167 | static ssize_t mtd_size_show(struct device *dev, | |
168 | struct device_attribute *attr, char *buf) | |
169 | { | |
170 | struct mtd_info *mtd = dev_to_mtd(dev); | |
171 | ||
172 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
173 | (unsigned long long)mtd->size); | |
174 | ||
175 | } | |
176 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
177 | ||
178 | static ssize_t mtd_erasesize_show(struct device *dev, | |
179 | struct device_attribute *attr, char *buf) | |
180 | { | |
181 | struct mtd_info *mtd = dev_to_mtd(dev); | |
182 | ||
183 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
184 | ||
185 | } | |
186 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
187 | ||
188 | static ssize_t mtd_writesize_show(struct device *dev, | |
189 | struct device_attribute *attr, char *buf) | |
190 | { | |
191 | struct mtd_info *mtd = dev_to_mtd(dev); | |
192 | ||
193 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
194 | ||
195 | } | |
196 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
197 | ||
e7693548 AB |
198 | static ssize_t mtd_subpagesize_show(struct device *dev, |
199 | struct device_attribute *attr, char *buf) | |
200 | { | |
201 | struct mtd_info *mtd = dev_to_mtd(dev); | |
202 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; | |
203 | ||
204 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); | |
205 | ||
206 | } | |
207 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); | |
208 | ||
694bb7fc KC |
209 | static ssize_t mtd_oobsize_show(struct device *dev, |
210 | struct device_attribute *attr, char *buf) | |
211 | { | |
212 | struct mtd_info *mtd = dev_to_mtd(dev); | |
213 | ||
214 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
215 | ||
216 | } | |
217 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
218 | ||
219 | static ssize_t mtd_numeraseregions_show(struct device *dev, | |
220 | struct device_attribute *attr, char *buf) | |
221 | { | |
222 | struct mtd_info *mtd = dev_to_mtd(dev); | |
223 | ||
224 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
225 | ||
226 | } | |
227 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
228 | NULL); | |
229 | ||
230 | static ssize_t mtd_name_show(struct device *dev, | |
231 | struct device_attribute *attr, char *buf) | |
232 | { | |
233 | struct mtd_info *mtd = dev_to_mtd(dev); | |
234 | ||
235 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
236 | ||
237 | } | |
238 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
1f24b5a8 DB |
239 | |
240 | static struct attribute *mtd_attrs[] = { | |
694bb7fc KC |
241 | &dev_attr_type.attr, |
242 | &dev_attr_flags.attr, | |
243 | &dev_attr_size.attr, | |
244 | &dev_attr_erasesize.attr, | |
245 | &dev_attr_writesize.attr, | |
e7693548 | 246 | &dev_attr_subpagesize.attr, |
694bb7fc KC |
247 | &dev_attr_oobsize.attr, |
248 | &dev_attr_numeraseregions.attr, | |
249 | &dev_attr_name.attr, | |
1f24b5a8 DB |
250 | NULL, |
251 | }; | |
252 | ||
fca91088 | 253 | static struct attribute_group mtd_group = { |
1f24b5a8 DB |
254 | .attrs = mtd_attrs, |
255 | }; | |
256 | ||
6469f540 | 257 | static const struct attribute_group *mtd_groups[] = { |
1f24b5a8 DB |
258 | &mtd_group, |
259 | NULL, | |
260 | }; | |
261 | ||
262 | static struct device_type mtd_devtype = { | |
263 | .name = "mtd", | |
264 | .groups = mtd_groups, | |
265 | .release = mtd_release, | |
266 | }; | |
267 | ||
1da177e4 LT |
268 | /** |
269 | * add_mtd_device - register an MTD device | |
270 | * @mtd: pointer to new MTD device info structure | |
271 | * | |
272 | * Add a device to the list of MTD devices present in the system, and | |
273 | * notify each currently active MTD 'user' of its arrival. Returns | |
274 | * zero on success or 1 on failure, which currently will only happen | |
b520e412 | 275 | * if there is insufficient memory or a sysfs error. |
1da177e4 LT |
276 | */ |
277 | ||
278 | int add_mtd_device(struct mtd_info *mtd) | |
279 | { | |
b520e412 BH |
280 | struct mtd_notifier *not; |
281 | int i, error; | |
1da177e4 | 282 | |
402d3265 DH |
283 | if (!mtd->backing_dev_info) { |
284 | switch (mtd->type) { | |
285 | case MTD_RAM: | |
286 | mtd->backing_dev_info = &mtd_bdi_rw_mappable; | |
287 | break; | |
288 | case MTD_ROM: | |
289 | mtd->backing_dev_info = &mtd_bdi_ro_mappable; | |
290 | break; | |
291 | default: | |
292 | mtd->backing_dev_info = &mtd_bdi_unmappable; | |
293 | break; | |
294 | } | |
295 | } | |
296 | ||
783ed81f | 297 | BUG_ON(mtd->writesize == 0); |
48b19268 | 298 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 299 | |
b520e412 BH |
300 | do { |
301 | if (!idr_pre_get(&mtd_idr, GFP_KERNEL)) | |
302 | goto fail_locked; | |
303 | error = idr_get_new(&mtd_idr, mtd, &i); | |
304 | } while (error == -EAGAIN); | |
187ef152 | 305 | |
b520e412 BH |
306 | if (error) |
307 | goto fail_locked; | |
1f24b5a8 | 308 | |
b520e412 BH |
309 | mtd->index = i; |
310 | mtd->usecount = 0; | |
311 | ||
312 | if (is_power_of_2(mtd->erasesize)) | |
313 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
314 | else | |
315 | mtd->erasesize_shift = 0; | |
316 | ||
317 | if (is_power_of_2(mtd->writesize)) | |
318 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
319 | else | |
320 | mtd->writesize_shift = 0; | |
321 | ||
322 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
323 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
324 | ||
325 | /* Some chips always power up locked. Unlock them now */ | |
326 | if ((mtd->flags & MTD_WRITEABLE) | |
327 | && (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) { | |
328 | if (mtd->unlock(mtd, 0, mtd->size)) | |
329 | printk(KERN_WARNING | |
330 | "%s: unlock failed, writes may not work\n", | |
331 | mtd->name); | |
332 | } | |
333 | ||
334 | /* Caller should have set dev.parent to match the | |
335 | * physical device. | |
336 | */ | |
337 | mtd->dev.type = &mtd_devtype; | |
338 | mtd->dev.class = &mtd_class; | |
339 | mtd->dev.devt = MTD_DEVT(i); | |
340 | dev_set_name(&mtd->dev, "mtd%d", i); | |
341 | dev_set_drvdata(&mtd->dev, mtd); | |
342 | if (device_register(&mtd->dev) != 0) | |
343 | goto fail_added; | |
344 | ||
345 | if (MTD_DEVT(i)) | |
346 | device_create(&mtd_class, mtd->dev.parent, | |
347 | MTD_DEVT(i) + 1, | |
348 | NULL, "mtd%dro", i); | |
349 | ||
350 | DEBUG(0, "mtd: Giving out device %d to %s\n", i, mtd->name); | |
351 | /* No need to get a refcount on the module containing | |
352 | the notifier, since we hold the mtd_table_mutex */ | |
353 | list_for_each_entry(not, &mtd_notifiers, list) | |
354 | not->add(mtd); | |
355 | ||
356 | mutex_unlock(&mtd_table_mutex); | |
357 | /* We _know_ we aren't being removed, because | |
358 | our caller is still holding us here. So none | |
359 | of this try_ nonsense, and no bitching about it | |
360 | either. :) */ | |
361 | __module_get(THIS_MODULE); | |
362 | return 0; | |
97894cda | 363 | |
b520e412 BH |
364 | fail_added: |
365 | idr_remove(&mtd_idr, i); | |
366 | fail_locked: | |
48b19268 | 367 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
368 | return 1; |
369 | } | |
370 | ||
371 | /** | |
372 | * del_mtd_device - unregister an MTD device | |
373 | * @mtd: pointer to MTD device info structure | |
374 | * | |
375 | * Remove a device from the list of MTD devices present in the system, | |
376 | * and notify each currently active MTD 'user' of its departure. | |
377 | * Returns zero on success or 1 on failure, which currently will happen | |
378 | * if the requested device does not appear to be present in the list. | |
379 | */ | |
380 | ||
381 | int del_mtd_device (struct mtd_info *mtd) | |
382 | { | |
383 | int ret; | |
75c0b84d | 384 | struct mtd_notifier *not; |
97894cda | 385 | |
48b19268 | 386 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 387 | |
b520e412 | 388 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
1da177e4 | 389 | ret = -ENODEV; |
75c0b84d ML |
390 | goto out_error; |
391 | } | |
392 | ||
393 | /* No need to get a refcount on the module containing | |
394 | the notifier, since we hold the mtd_table_mutex */ | |
395 | list_for_each_entry(not, &mtd_notifiers, list) | |
396 | not->remove(mtd); | |
397 | ||
398 | if (mtd->usecount) { | |
97894cda | 399 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
1da177e4 LT |
400 | mtd->index, mtd->name, mtd->usecount); |
401 | ret = -EBUSY; | |
402 | } else { | |
694bb7fc KC |
403 | device_unregister(&mtd->dev); |
404 | ||
b520e412 | 405 | idr_remove(&mtd_idr, mtd->index); |
1da177e4 LT |
406 | |
407 | module_put(THIS_MODULE); | |
408 | ret = 0; | |
409 | } | |
410 | ||
75c0b84d | 411 | out_error: |
48b19268 | 412 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
413 | return ret; |
414 | } | |
415 | ||
416 | /** | |
417 | * register_mtd_user - register a 'user' of MTD devices. | |
418 | * @new: pointer to notifier info structure | |
419 | * | |
420 | * Registers a pair of callbacks function to be called upon addition | |
421 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
422 | * invoked for each MTD device currently present in the system. | |
423 | */ | |
424 | ||
425 | void register_mtd_user (struct mtd_notifier *new) | |
426 | { | |
f1332ba2 | 427 | struct mtd_info *mtd; |
1da177e4 | 428 | |
48b19268 | 429 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
430 | |
431 | list_add(&new->list, &mtd_notifiers); | |
432 | ||
433 | __module_get(THIS_MODULE); | |
97894cda | 434 | |
f1332ba2 BH |
435 | mtd_for_each_device(mtd) |
436 | new->add(mtd); | |
1da177e4 | 437 | |
48b19268 | 438 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
439 | } |
440 | ||
441 | /** | |
49450795 AB |
442 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
443 | * @old: pointer to notifier info structure | |
1da177e4 LT |
444 | * |
445 | * Removes a callback function pair from the list of 'users' to be | |
446 | * notified upon addition or removal of MTD devices. Causes the | |
447 | * 'remove' callback to be immediately invoked for each MTD device | |
448 | * currently present in the system. | |
449 | */ | |
450 | ||
451 | int unregister_mtd_user (struct mtd_notifier *old) | |
452 | { | |
f1332ba2 | 453 | struct mtd_info *mtd; |
1da177e4 | 454 | |
48b19268 | 455 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
456 | |
457 | module_put(THIS_MODULE); | |
458 | ||
f1332ba2 BH |
459 | mtd_for_each_device(mtd) |
460 | old->remove(mtd); | |
97894cda | 461 | |
1da177e4 | 462 | list_del(&old->list); |
48b19268 | 463 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
464 | return 0; |
465 | } | |
466 | ||
467 | ||
468 | /** | |
469 | * get_mtd_device - obtain a validated handle for an MTD device | |
470 | * @mtd: last known address of the required MTD device | |
471 | * @num: internal device number of the required MTD device | |
472 | * | |
473 | * Given a number and NULL address, return the num'th entry in the device | |
474 | * table, if any. Given an address and num == -1, search the device table | |
475 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
476 | * both, return the num'th driver only if its address matches. Return |
477 | * error code if not. | |
1da177e4 | 478 | */ |
97894cda | 479 | |
1da177e4 LT |
480 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
481 | { | |
f1332ba2 BH |
482 | struct mtd_info *ret = NULL, *other; |
483 | int err = -ENODEV; | |
1da177e4 | 484 | |
48b19268 | 485 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
486 | |
487 | if (num == -1) { | |
f1332ba2 BH |
488 | mtd_for_each_device(other) { |
489 | if (other == mtd) { | |
490 | ret = mtd; | |
491 | break; | |
492 | } | |
493 | } | |
b520e412 BH |
494 | } else if (num >= 0) { |
495 | ret = idr_find(&mtd_idr, num); | |
1da177e4 LT |
496 | if (mtd && mtd != ret) |
497 | ret = NULL; | |
498 | } | |
499 | ||
3bd45657 ML |
500 | if (!ret) { |
501 | ret = ERR_PTR(err); | |
502 | goto out; | |
9fe912ce | 503 | } |
1da177e4 | 504 | |
3bd45657 ML |
505 | err = __get_mtd_device(ret); |
506 | if (err) | |
507 | ret = ERR_PTR(err); | |
508 | out: | |
9c74034f AB |
509 | mutex_unlock(&mtd_table_mutex); |
510 | return ret; | |
3bd45657 | 511 | } |
1da177e4 | 512 | |
3bd45657 ML |
513 | |
514 | int __get_mtd_device(struct mtd_info *mtd) | |
515 | { | |
516 | int err; | |
517 | ||
518 | if (!try_module_get(mtd->owner)) | |
519 | return -ENODEV; | |
520 | ||
521 | if (mtd->get_device) { | |
522 | ||
523 | err = mtd->get_device(mtd); | |
524 | ||
525 | if (err) { | |
526 | module_put(mtd->owner); | |
527 | return err; | |
528 | } | |
529 | } | |
530 | mtd->usecount++; | |
531 | return 0; | |
1da177e4 LT |
532 | } |
533 | ||
7799308f AB |
534 | /** |
535 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
536 | * device name | |
537 | * @name: MTD device name to open | |
538 | * | |
539 | * This function returns MTD device description structure in case of | |
540 | * success and an error code in case of failure. | |
541 | */ | |
542 | ||
543 | struct mtd_info *get_mtd_device_nm(const char *name) | |
544 | { | |
f1332ba2 BH |
545 | int err = -ENODEV; |
546 | struct mtd_info *mtd = NULL, *other; | |
7799308f AB |
547 | |
548 | mutex_lock(&mtd_table_mutex); | |
549 | ||
f1332ba2 BH |
550 | mtd_for_each_device(other) { |
551 | if (!strcmp(name, other->name)) { | |
552 | mtd = other; | |
7799308f AB |
553 | break; |
554 | } | |
555 | } | |
556 | ||
9fe912ce | 557 | if (!mtd) |
7799308f AB |
558 | goto out_unlock; |
559 | ||
560 | if (!try_module_get(mtd->owner)) | |
561 | goto out_unlock; | |
562 | ||
9fe912ce AB |
563 | if (mtd->get_device) { |
564 | err = mtd->get_device(mtd); | |
565 | if (err) | |
566 | goto out_put; | |
567 | } | |
568 | ||
7799308f | 569 | mtd->usecount++; |
9fe912ce AB |
570 | mutex_unlock(&mtd_table_mutex); |
571 | return mtd; | |
7799308f | 572 | |
9fe912ce AB |
573 | out_put: |
574 | module_put(mtd->owner); | |
7799308f AB |
575 | out_unlock: |
576 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 577 | return ERR_PTR(err); |
7799308f AB |
578 | } |
579 | ||
1da177e4 LT |
580 | void put_mtd_device(struct mtd_info *mtd) |
581 | { | |
48b19268 | 582 | mutex_lock(&mtd_table_mutex); |
3bd45657 ML |
583 | __put_mtd_device(mtd); |
584 | mutex_unlock(&mtd_table_mutex); | |
585 | ||
586 | } | |
587 | ||
588 | void __put_mtd_device(struct mtd_info *mtd) | |
589 | { | |
590 | --mtd->usecount; | |
591 | BUG_ON(mtd->usecount < 0); | |
592 | ||
9fe912ce AB |
593 | if (mtd->put_device) |
594 | mtd->put_device(mtd); | |
1da177e4 LT |
595 | |
596 | module_put(mtd->owner); | |
597 | } | |
598 | ||
599 | /* default_mtd_writev - default mtd writev method for MTD devices that | |
dd36f267 | 600 | * don't implement their own |
1da177e4 LT |
601 | */ |
602 | ||
603 | int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
604 | unsigned long count, loff_t to, size_t *retlen) | |
605 | { | |
606 | unsigned long i; | |
607 | size_t totlen = 0, thislen; | |
608 | int ret = 0; | |
609 | ||
610 | if(!mtd->write) { | |
611 | ret = -EROFS; | |
612 | } else { | |
613 | for (i=0; i<count; i++) { | |
614 | if (!vecs[i].iov_len) | |
615 | continue; | |
616 | ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); | |
617 | totlen += thislen; | |
618 | if (ret || thislen != vecs[i].iov_len) | |
619 | break; | |
620 | to += vecs[i].iov_len; | |
621 | } | |
622 | } | |
623 | if (retlen) | |
624 | *retlen = totlen; | |
625 | return ret; | |
626 | } | |
627 | ||
dd36f267 DW |
628 | EXPORT_SYMBOL_GPL(add_mtd_device); |
629 | EXPORT_SYMBOL_GPL(del_mtd_device); | |
630 | EXPORT_SYMBOL_GPL(get_mtd_device); | |
631 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); | |
3bd45657 | 632 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
dd36f267 | 633 | EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd45657 | 634 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
dd36f267 DW |
635 | EXPORT_SYMBOL_GPL(register_mtd_user); |
636 | EXPORT_SYMBOL_GPL(unregister_mtd_user); | |
637 | EXPORT_SYMBOL_GPL(default_mtd_writev); | |
1da177e4 | 638 | |
2d2dce0e PM |
639 | #ifdef CONFIG_PROC_FS |
640 | ||
1da177e4 LT |
641 | /*====================================================================*/ |
642 | /* Support for /proc/mtd */ | |
643 | ||
1da177e4 LT |
644 | static struct proc_dir_entry *proc_mtd; |
645 | ||
f1332ba2 | 646 | static inline int mtd_proc_info(char *buf, struct mtd_info *this) |
1da177e4 | 647 | { |
f1332ba2 | 648 | return sprintf(buf, "mtd%d: %8.8llx %8.8x \"%s\"\n", this->index, |
69423d99 | 649 | (unsigned long long)this->size, |
1da177e4 LT |
650 | this->erasesize, this->name); |
651 | } | |
652 | ||
653 | static int mtd_read_proc (char *page, char **start, off_t off, int count, | |
654 | int *eof, void *data_unused) | |
655 | { | |
f1332ba2 BH |
656 | struct mtd_info *mtd; |
657 | int len, l; | |
1da177e4 LT |
658 | off_t begin = 0; |
659 | ||
48b19268 | 660 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
661 | |
662 | len = sprintf(page, "dev: size erasesize name\n"); | |
f1332ba2 BH |
663 | mtd_for_each_device(mtd) { |
664 | l = mtd_proc_info(page + len, mtd); | |
1da177e4 LT |
665 | len += l; |
666 | if (len+begin > off+count) | |
667 | goto done; | |
668 | if (len+begin < off) { | |
669 | begin += len; | |
670 | len = 0; | |
671 | } | |
672 | } | |
673 | ||
674 | *eof = 1; | |
675 | ||
676 | done: | |
48b19268 | 677 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
678 | if (off >= len+begin) |
679 | return 0; | |
680 | *start = page + (off-begin); | |
681 | return ((count < begin+len-off) ? count : begin+len-off); | |
682 | } | |
683 | ||
45b09076 KC |
684 | #endif /* CONFIG_PROC_FS */ |
685 | ||
1da177e4 LT |
686 | /*====================================================================*/ |
687 | /* Init code */ | |
688 | ||
0661b1ac JA |
689 | static int __init mtd_bdi_init(struct backing_dev_info *bdi, const char *name) |
690 | { | |
691 | int ret; | |
692 | ||
693 | ret = bdi_init(bdi); | |
694 | if (!ret) | |
695 | ret = bdi_register(bdi, NULL, name); | |
696 | ||
697 | if (ret) | |
698 | bdi_destroy(bdi); | |
699 | ||
700 | return ret; | |
701 | } | |
702 | ||
1da177e4 LT |
703 | static int __init init_mtd(void) |
704 | { | |
15bce40c | 705 | int ret; |
0661b1ac | 706 | |
15bce40c | 707 | ret = class_register(&mtd_class); |
0661b1ac JA |
708 | if (ret) |
709 | goto err_reg; | |
710 | ||
711 | ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap"); | |
712 | if (ret) | |
713 | goto err_bdi1; | |
714 | ||
715 | ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap"); | |
716 | if (ret) | |
717 | goto err_bdi2; | |
718 | ||
719 | ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap"); | |
720 | if (ret) | |
721 | goto err_bdi3; | |
694bb7fc | 722 | |
45b09076 | 723 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
724 | if ((proc_mtd = create_proc_entry( "mtd", 0, NULL ))) |
725 | proc_mtd->read_proc = mtd_read_proc; | |
45b09076 | 726 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 727 | return 0; |
0661b1ac JA |
728 | |
729 | err_bdi3: | |
730 | bdi_destroy(&mtd_bdi_ro_mappable); | |
731 | err_bdi2: | |
732 | bdi_destroy(&mtd_bdi_unmappable); | |
733 | err_bdi1: | |
734 | class_unregister(&mtd_class); | |
735 | err_reg: | |
736 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
737 | return ret; | |
1da177e4 LT |
738 | } |
739 | ||
740 | static void __exit cleanup_mtd(void) | |
741 | { | |
45b09076 | 742 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
743 | if (proc_mtd) |
744 | remove_proc_entry( "mtd", NULL); | |
45b09076 | 745 | #endif /* CONFIG_PROC_FS */ |
15bce40c | 746 | class_unregister(&mtd_class); |
0661b1ac JA |
747 | bdi_destroy(&mtd_bdi_unmappable); |
748 | bdi_destroy(&mtd_bdi_ro_mappable); | |
749 | bdi_destroy(&mtd_bdi_rw_mappable); | |
1da177e4 LT |
750 | } |
751 | ||
752 | module_init(init_mtd); | |
753 | module_exit(cleanup_mtd); | |
754 | ||
1da177e4 LT |
755 | MODULE_LICENSE("GPL"); |
756 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
757 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |