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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 | * | |
a1452a37 DW |
5 | * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
6 | * Copyright © 2006 Red Hat UK Limited | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | * | |
1da177e4 LT |
22 | */ |
23 | ||
1da177e4 LT |
24 | #include <linux/module.h> |
25 | #include <linux/kernel.h> | |
1da177e4 | 26 | #include <linux/ptrace.h> |
1da177e4 LT |
27 | #include <linux/string.h> |
28 | #include <linux/timer.h> | |
29 | #include <linux/major.h> | |
30 | #include <linux/fs.h> | |
7799308f | 31 | #include <linux/err.h> |
1da177e4 LT |
32 | #include <linux/ioctl.h> |
33 | #include <linux/init.h> | |
1da177e4 | 34 | #include <linux/proc_fs.h> |
b520e412 | 35 | #include <linux/idr.h> |
a33eb6b9 | 36 | #include <linux/backing-dev.h> |
05d71b46 | 37 | #include <linux/gfp.h> |
1da177e4 LT |
38 | |
39 | #include <linux/mtd/mtd.h> | |
40 | ||
356d70f1 | 41 | #include "mtdcore.h" |
a33eb6b9 JE |
42 | /* |
43 | * backing device capabilities for non-mappable devices (such as NAND flash) | |
44 | * - permits private mappings, copies are taken of the data | |
45 | */ | |
ca91facf | 46 | static struct backing_dev_info mtd_bdi_unmappable = { |
a33eb6b9 JE |
47 | .capabilities = BDI_CAP_MAP_COPY, |
48 | }; | |
49 | ||
50 | /* | |
51 | * backing device capabilities for R/O mappable devices (such as ROM) | |
52 | * - permits private mappings, copies are taken of the data | |
53 | * - permits non-writable shared mappings | |
54 | */ | |
ca91facf | 55 | static struct backing_dev_info mtd_bdi_ro_mappable = { |
a33eb6b9 JE |
56 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | |
57 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), | |
58 | }; | |
59 | ||
60 | /* | |
61 | * backing device capabilities for writable mappable devices (such as RAM) | |
62 | * - permits private mappings, copies are taken of the data | |
63 | * - permits non-writable shared mappings | |
64 | */ | |
ca91facf | 65 | static struct backing_dev_info mtd_bdi_rw_mappable = { |
a33eb6b9 JE |
66 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | |
67 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | | |
68 | BDI_CAP_WRITE_MAP), | |
69 | }; | |
356d70f1 | 70 | |
15bce40c DW |
71 | static int mtd_cls_suspend(struct device *dev, pm_message_t state); |
72 | static int mtd_cls_resume(struct device *dev); | |
73 | ||
74 | static struct class mtd_class = { | |
75 | .name = "mtd", | |
76 | .owner = THIS_MODULE, | |
77 | .suspend = mtd_cls_suspend, | |
78 | .resume = mtd_cls_resume, | |
79 | }; | |
1f24b5a8 | 80 | |
b520e412 BH |
81 | static DEFINE_IDR(mtd_idr); |
82 | ||
97894cda | 83 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 84 | should not use them for _anything_ else */ |
48b19268 | 85 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 | 86 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
b520e412 BH |
87 | |
88 | struct mtd_info *__mtd_next_device(int i) | |
89 | { | |
90 | return idr_get_next(&mtd_idr, &i); | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
1da177e4 LT |
93 | |
94 | static LIST_HEAD(mtd_notifiers); | |
95 | ||
1f24b5a8 DB |
96 | |
97 | #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) | |
98 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) | |
99 | #else | |
100 | #define MTD_DEVT(index) 0 | |
101 | #endif | |
102 | ||
103 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
104 | * the mtd_info will probably want to use the release() hook... | |
105 | */ | |
106 | static void mtd_release(struct device *dev) | |
107 | { | |
2fdb1144 | 108 | dev_t index = MTD_DEVT(dev_to_mtd(dev)->index); |
1f24b5a8 DB |
109 | |
110 | /* remove /dev/mtdXro node if needed */ | |
2fdb1144 | 111 | if (index) |
15bce40c DW |
112 | device_destroy(&mtd_class, index + 1); |
113 | } | |
114 | ||
115 | static int mtd_cls_suspend(struct device *dev, pm_message_t state) | |
116 | { | |
117 | struct mtd_info *mtd = dev_to_mtd(dev); | |
6afc4fdb SB |
118 | |
119 | if (mtd && mtd->suspend) | |
15bce40c DW |
120 | return mtd->suspend(mtd); |
121 | else | |
122 | return 0; | |
123 | } | |
124 | ||
125 | static int mtd_cls_resume(struct device *dev) | |
126 | { | |
127 | struct mtd_info *mtd = dev_to_mtd(dev); | |
128 | ||
6afc4fdb | 129 | if (mtd && mtd->resume) |
15bce40c DW |
130 | mtd->resume(mtd); |
131 | return 0; | |
1f24b5a8 DB |
132 | } |
133 | ||
134 | static ssize_t mtd_type_show(struct device *dev, | |
135 | struct device_attribute *attr, char *buf) | |
136 | { | |
137 | struct mtd_info *mtd = dev_to_mtd(dev); | |
138 | char *type; | |
139 | ||
140 | switch (mtd->type) { | |
141 | case MTD_ABSENT: | |
142 | type = "absent"; | |
143 | break; | |
144 | case MTD_RAM: | |
145 | type = "ram"; | |
146 | break; | |
147 | case MTD_ROM: | |
148 | type = "rom"; | |
149 | break; | |
150 | case MTD_NORFLASH: | |
151 | type = "nor"; | |
152 | break; | |
153 | case MTD_NANDFLASH: | |
154 | type = "nand"; | |
155 | break; | |
156 | case MTD_DATAFLASH: | |
157 | type = "dataflash"; | |
158 | break; | |
159 | case MTD_UBIVOLUME: | |
160 | type = "ubi"; | |
161 | break; | |
162 | default: | |
163 | type = "unknown"; | |
164 | } | |
165 | ||
166 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
167 | } | |
694bb7fc KC |
168 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
169 | ||
170 | static ssize_t mtd_flags_show(struct device *dev, | |
171 | struct device_attribute *attr, char *buf) | |
172 | { | |
173 | struct mtd_info *mtd = dev_to_mtd(dev); | |
174 | ||
175 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
176 | ||
177 | } | |
178 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
179 | ||
180 | static ssize_t mtd_size_show(struct device *dev, | |
181 | struct device_attribute *attr, char *buf) | |
182 | { | |
183 | struct mtd_info *mtd = dev_to_mtd(dev); | |
184 | ||
185 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
186 | (unsigned long long)mtd->size); | |
187 | ||
188 | } | |
189 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
190 | ||
191 | static ssize_t mtd_erasesize_show(struct device *dev, | |
192 | struct device_attribute *attr, char *buf) | |
193 | { | |
194 | struct mtd_info *mtd = dev_to_mtd(dev); | |
195 | ||
196 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
197 | ||
198 | } | |
199 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
200 | ||
201 | static ssize_t mtd_writesize_show(struct device *dev, | |
202 | struct device_attribute *attr, char *buf) | |
203 | { | |
204 | struct mtd_info *mtd = dev_to_mtd(dev); | |
205 | ||
206 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
207 | ||
208 | } | |
209 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
210 | ||
e7693548 AB |
211 | static ssize_t mtd_subpagesize_show(struct device *dev, |
212 | struct device_attribute *attr, char *buf) | |
213 | { | |
214 | struct mtd_info *mtd = dev_to_mtd(dev); | |
215 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; | |
216 | ||
217 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); | |
218 | ||
219 | } | |
220 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); | |
221 | ||
694bb7fc KC |
222 | static ssize_t mtd_oobsize_show(struct device *dev, |
223 | struct device_attribute *attr, char *buf) | |
224 | { | |
225 | struct mtd_info *mtd = dev_to_mtd(dev); | |
226 | ||
227 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
228 | ||
229 | } | |
230 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
231 | ||
232 | static ssize_t mtd_numeraseregions_show(struct device *dev, | |
233 | struct device_attribute *attr, char *buf) | |
234 | { | |
235 | struct mtd_info *mtd = dev_to_mtd(dev); | |
236 | ||
237 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
238 | ||
239 | } | |
240 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
241 | NULL); | |
242 | ||
243 | static ssize_t mtd_name_show(struct device *dev, | |
244 | struct device_attribute *attr, char *buf) | |
245 | { | |
246 | struct mtd_info *mtd = dev_to_mtd(dev); | |
247 | ||
248 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
249 | ||
250 | } | |
251 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
1f24b5a8 DB |
252 | |
253 | static struct attribute *mtd_attrs[] = { | |
694bb7fc KC |
254 | &dev_attr_type.attr, |
255 | &dev_attr_flags.attr, | |
256 | &dev_attr_size.attr, | |
257 | &dev_attr_erasesize.attr, | |
258 | &dev_attr_writesize.attr, | |
e7693548 | 259 | &dev_attr_subpagesize.attr, |
694bb7fc KC |
260 | &dev_attr_oobsize.attr, |
261 | &dev_attr_numeraseregions.attr, | |
262 | &dev_attr_name.attr, | |
1f24b5a8 DB |
263 | NULL, |
264 | }; | |
265 | ||
fca91088 | 266 | static struct attribute_group mtd_group = { |
1f24b5a8 DB |
267 | .attrs = mtd_attrs, |
268 | }; | |
269 | ||
6469f540 | 270 | static const struct attribute_group *mtd_groups[] = { |
1f24b5a8 DB |
271 | &mtd_group, |
272 | NULL, | |
273 | }; | |
274 | ||
275 | static struct device_type mtd_devtype = { | |
276 | .name = "mtd", | |
277 | .groups = mtd_groups, | |
278 | .release = mtd_release, | |
279 | }; | |
280 | ||
1da177e4 LT |
281 | /** |
282 | * add_mtd_device - register an MTD device | |
283 | * @mtd: pointer to new MTD device info structure | |
284 | * | |
285 | * Add a device to the list of MTD devices present in the system, and | |
286 | * notify each currently active MTD 'user' of its arrival. Returns | |
287 | * zero on success or 1 on failure, which currently will only happen | |
b520e412 | 288 | * if there is insufficient memory or a sysfs error. |
1da177e4 LT |
289 | */ |
290 | ||
291 | int add_mtd_device(struct mtd_info *mtd) | |
292 | { | |
b520e412 BH |
293 | struct mtd_notifier *not; |
294 | int i, error; | |
1da177e4 | 295 | |
402d3265 DH |
296 | if (!mtd->backing_dev_info) { |
297 | switch (mtd->type) { | |
298 | case MTD_RAM: | |
299 | mtd->backing_dev_info = &mtd_bdi_rw_mappable; | |
300 | break; | |
301 | case MTD_ROM: | |
302 | mtd->backing_dev_info = &mtd_bdi_ro_mappable; | |
303 | break; | |
304 | default: | |
305 | mtd->backing_dev_info = &mtd_bdi_unmappable; | |
306 | break; | |
307 | } | |
308 | } | |
309 | ||
783ed81f | 310 | BUG_ON(mtd->writesize == 0); |
48b19268 | 311 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 312 | |
b520e412 BH |
313 | do { |
314 | if (!idr_pre_get(&mtd_idr, GFP_KERNEL)) | |
315 | goto fail_locked; | |
316 | error = idr_get_new(&mtd_idr, mtd, &i); | |
317 | } while (error == -EAGAIN); | |
187ef152 | 318 | |
b520e412 BH |
319 | if (error) |
320 | goto fail_locked; | |
1f24b5a8 | 321 | |
b520e412 BH |
322 | mtd->index = i; |
323 | mtd->usecount = 0; | |
324 | ||
325 | if (is_power_of_2(mtd->erasesize)) | |
326 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
327 | else | |
328 | mtd->erasesize_shift = 0; | |
329 | ||
330 | if (is_power_of_2(mtd->writesize)) | |
331 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
332 | else | |
333 | mtd->writesize_shift = 0; | |
334 | ||
335 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
336 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
337 | ||
338 | /* Some chips always power up locked. Unlock them now */ | |
339 | if ((mtd->flags & MTD_WRITEABLE) | |
340 | && (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) { | |
341 | if (mtd->unlock(mtd, 0, mtd->size)) | |
342 | printk(KERN_WARNING | |
343 | "%s: unlock failed, writes may not work\n", | |
344 | mtd->name); | |
345 | } | |
346 | ||
347 | /* Caller should have set dev.parent to match the | |
348 | * physical device. | |
349 | */ | |
350 | mtd->dev.type = &mtd_devtype; | |
351 | mtd->dev.class = &mtd_class; | |
352 | mtd->dev.devt = MTD_DEVT(i); | |
353 | dev_set_name(&mtd->dev, "mtd%d", i); | |
354 | dev_set_drvdata(&mtd->dev, mtd); | |
355 | if (device_register(&mtd->dev) != 0) | |
356 | goto fail_added; | |
357 | ||
358 | if (MTD_DEVT(i)) | |
359 | device_create(&mtd_class, mtd->dev.parent, | |
360 | MTD_DEVT(i) + 1, | |
361 | NULL, "mtd%dro", i); | |
362 | ||
363 | DEBUG(0, "mtd: Giving out device %d to %s\n", i, mtd->name); | |
364 | /* No need to get a refcount on the module containing | |
365 | the notifier, since we hold the mtd_table_mutex */ | |
366 | list_for_each_entry(not, &mtd_notifiers, list) | |
367 | not->add(mtd); | |
368 | ||
369 | mutex_unlock(&mtd_table_mutex); | |
370 | /* We _know_ we aren't being removed, because | |
371 | our caller is still holding us here. So none | |
372 | of this try_ nonsense, and no bitching about it | |
373 | either. :) */ | |
374 | __module_get(THIS_MODULE); | |
375 | return 0; | |
97894cda | 376 | |
b520e412 BH |
377 | fail_added: |
378 | idr_remove(&mtd_idr, i); | |
379 | fail_locked: | |
48b19268 | 380 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
381 | return 1; |
382 | } | |
383 | ||
384 | /** | |
385 | * del_mtd_device - unregister an MTD device | |
386 | * @mtd: pointer to MTD device info structure | |
387 | * | |
388 | * Remove a device from the list of MTD devices present in the system, | |
389 | * and notify each currently active MTD 'user' of its departure. | |
390 | * Returns zero on success or 1 on failure, which currently will happen | |
391 | * if the requested device does not appear to be present in the list. | |
392 | */ | |
393 | ||
394 | int del_mtd_device (struct mtd_info *mtd) | |
395 | { | |
396 | int ret; | |
75c0b84d | 397 | struct mtd_notifier *not; |
97894cda | 398 | |
48b19268 | 399 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 400 | |
b520e412 | 401 | if (idr_find(&mtd_idr, mtd->index) != mtd) { |
1da177e4 | 402 | ret = -ENODEV; |
75c0b84d ML |
403 | goto out_error; |
404 | } | |
405 | ||
406 | /* No need to get a refcount on the module containing | |
407 | the notifier, since we hold the mtd_table_mutex */ | |
408 | list_for_each_entry(not, &mtd_notifiers, list) | |
409 | not->remove(mtd); | |
410 | ||
411 | if (mtd->usecount) { | |
97894cda | 412 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
1da177e4 LT |
413 | mtd->index, mtd->name, mtd->usecount); |
414 | ret = -EBUSY; | |
415 | } else { | |
694bb7fc KC |
416 | device_unregister(&mtd->dev); |
417 | ||
b520e412 | 418 | idr_remove(&mtd_idr, mtd->index); |
1da177e4 LT |
419 | |
420 | module_put(THIS_MODULE); | |
421 | ret = 0; | |
422 | } | |
423 | ||
75c0b84d | 424 | out_error: |
48b19268 | 425 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
426 | return ret; |
427 | } | |
428 | ||
429 | /** | |
430 | * register_mtd_user - register a 'user' of MTD devices. | |
431 | * @new: pointer to notifier info structure | |
432 | * | |
433 | * Registers a pair of callbacks function to be called upon addition | |
434 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
435 | * invoked for each MTD device currently present in the system. | |
436 | */ | |
437 | ||
438 | void register_mtd_user (struct mtd_notifier *new) | |
439 | { | |
f1332ba2 | 440 | struct mtd_info *mtd; |
1da177e4 | 441 | |
48b19268 | 442 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
443 | |
444 | list_add(&new->list, &mtd_notifiers); | |
445 | ||
446 | __module_get(THIS_MODULE); | |
97894cda | 447 | |
f1332ba2 BH |
448 | mtd_for_each_device(mtd) |
449 | new->add(mtd); | |
1da177e4 | 450 | |
48b19268 | 451 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
452 | } |
453 | ||
454 | /** | |
49450795 AB |
455 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
456 | * @old: pointer to notifier info structure | |
1da177e4 LT |
457 | * |
458 | * Removes a callback function pair from the list of 'users' to be | |
459 | * notified upon addition or removal of MTD devices. Causes the | |
460 | * 'remove' callback to be immediately invoked for each MTD device | |
461 | * currently present in the system. | |
462 | */ | |
463 | ||
464 | int unregister_mtd_user (struct mtd_notifier *old) | |
465 | { | |
f1332ba2 | 466 | struct mtd_info *mtd; |
1da177e4 | 467 | |
48b19268 | 468 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
469 | |
470 | module_put(THIS_MODULE); | |
471 | ||
f1332ba2 BH |
472 | mtd_for_each_device(mtd) |
473 | old->remove(mtd); | |
97894cda | 474 | |
1da177e4 | 475 | list_del(&old->list); |
48b19268 | 476 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
477 | return 0; |
478 | } | |
479 | ||
480 | ||
481 | /** | |
482 | * get_mtd_device - obtain a validated handle for an MTD device | |
483 | * @mtd: last known address of the required MTD device | |
484 | * @num: internal device number of the required MTD device | |
485 | * | |
486 | * Given a number and NULL address, return the num'th entry in the device | |
487 | * table, if any. Given an address and num == -1, search the device table | |
488 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
489 | * both, return the num'th driver only if its address matches. Return |
490 | * error code if not. | |
1da177e4 | 491 | */ |
97894cda | 492 | |
1da177e4 LT |
493 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
494 | { | |
f1332ba2 BH |
495 | struct mtd_info *ret = NULL, *other; |
496 | int err = -ENODEV; | |
1da177e4 | 497 | |
48b19268 | 498 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
499 | |
500 | if (num == -1) { | |
f1332ba2 BH |
501 | mtd_for_each_device(other) { |
502 | if (other == mtd) { | |
503 | ret = mtd; | |
504 | break; | |
505 | } | |
506 | } | |
b520e412 BH |
507 | } else if (num >= 0) { |
508 | ret = idr_find(&mtd_idr, num); | |
1da177e4 LT |
509 | if (mtd && mtd != ret) |
510 | ret = NULL; | |
511 | } | |
512 | ||
3bd45657 ML |
513 | if (!ret) { |
514 | ret = ERR_PTR(err); | |
515 | goto out; | |
9fe912ce | 516 | } |
1da177e4 | 517 | |
3bd45657 ML |
518 | err = __get_mtd_device(ret); |
519 | if (err) | |
520 | ret = ERR_PTR(err); | |
521 | out: | |
9c74034f AB |
522 | mutex_unlock(&mtd_table_mutex); |
523 | return ret; | |
3bd45657 | 524 | } |
1da177e4 | 525 | |
3bd45657 ML |
526 | |
527 | int __get_mtd_device(struct mtd_info *mtd) | |
528 | { | |
529 | int err; | |
530 | ||
531 | if (!try_module_get(mtd->owner)) | |
532 | return -ENODEV; | |
533 | ||
534 | if (mtd->get_device) { | |
535 | ||
536 | err = mtd->get_device(mtd); | |
537 | ||
538 | if (err) { | |
539 | module_put(mtd->owner); | |
540 | return err; | |
541 | } | |
542 | } | |
543 | mtd->usecount++; | |
544 | return 0; | |
1da177e4 LT |
545 | } |
546 | ||
7799308f AB |
547 | /** |
548 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
549 | * device name | |
550 | * @name: MTD device name to open | |
551 | * | |
552 | * This function returns MTD device description structure in case of | |
553 | * success and an error code in case of failure. | |
554 | */ | |
555 | ||
556 | struct mtd_info *get_mtd_device_nm(const char *name) | |
557 | { | |
f1332ba2 BH |
558 | int err = -ENODEV; |
559 | struct mtd_info *mtd = NULL, *other; | |
7799308f AB |
560 | |
561 | mutex_lock(&mtd_table_mutex); | |
562 | ||
f1332ba2 BH |
563 | mtd_for_each_device(other) { |
564 | if (!strcmp(name, other->name)) { | |
565 | mtd = other; | |
7799308f AB |
566 | break; |
567 | } | |
568 | } | |
569 | ||
9fe912ce | 570 | if (!mtd) |
7799308f AB |
571 | goto out_unlock; |
572 | ||
573 | if (!try_module_get(mtd->owner)) | |
574 | goto out_unlock; | |
575 | ||
9fe912ce AB |
576 | if (mtd->get_device) { |
577 | err = mtd->get_device(mtd); | |
578 | if (err) | |
579 | goto out_put; | |
580 | } | |
581 | ||
7799308f | 582 | mtd->usecount++; |
9fe912ce AB |
583 | mutex_unlock(&mtd_table_mutex); |
584 | return mtd; | |
7799308f | 585 | |
9fe912ce AB |
586 | out_put: |
587 | module_put(mtd->owner); | |
7799308f AB |
588 | out_unlock: |
589 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 590 | return ERR_PTR(err); |
7799308f AB |
591 | } |
592 | ||
1da177e4 LT |
593 | void put_mtd_device(struct mtd_info *mtd) |
594 | { | |
48b19268 | 595 | mutex_lock(&mtd_table_mutex); |
3bd45657 ML |
596 | __put_mtd_device(mtd); |
597 | mutex_unlock(&mtd_table_mutex); | |
598 | ||
599 | } | |
600 | ||
601 | void __put_mtd_device(struct mtd_info *mtd) | |
602 | { | |
603 | --mtd->usecount; | |
604 | BUG_ON(mtd->usecount < 0); | |
605 | ||
9fe912ce AB |
606 | if (mtd->put_device) |
607 | mtd->put_device(mtd); | |
1da177e4 LT |
608 | |
609 | module_put(mtd->owner); | |
610 | } | |
611 | ||
612 | /* default_mtd_writev - default mtd writev method for MTD devices that | |
dd36f267 | 613 | * don't implement their own |
1da177e4 LT |
614 | */ |
615 | ||
616 | int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
617 | unsigned long count, loff_t to, size_t *retlen) | |
618 | { | |
619 | unsigned long i; | |
620 | size_t totlen = 0, thislen; | |
621 | int ret = 0; | |
622 | ||
623 | if(!mtd->write) { | |
624 | ret = -EROFS; | |
625 | } else { | |
626 | for (i=0; i<count; i++) { | |
627 | if (!vecs[i].iov_len) | |
628 | continue; | |
629 | ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); | |
630 | totlen += thislen; | |
631 | if (ret || thislen != vecs[i].iov_len) | |
632 | break; | |
633 | to += vecs[i].iov_len; | |
634 | } | |
635 | } | |
636 | if (retlen) | |
637 | *retlen = totlen; | |
638 | return ret; | |
639 | } | |
640 | ||
dd36f267 DW |
641 | EXPORT_SYMBOL_GPL(add_mtd_device); |
642 | EXPORT_SYMBOL_GPL(del_mtd_device); | |
643 | EXPORT_SYMBOL_GPL(get_mtd_device); | |
644 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); | |
3bd45657 | 645 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
dd36f267 | 646 | EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd45657 | 647 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
dd36f267 DW |
648 | EXPORT_SYMBOL_GPL(register_mtd_user); |
649 | EXPORT_SYMBOL_GPL(unregister_mtd_user); | |
650 | EXPORT_SYMBOL_GPL(default_mtd_writev); | |
1da177e4 | 651 | |
2d2dce0e PM |
652 | #ifdef CONFIG_PROC_FS |
653 | ||
1da177e4 LT |
654 | /*====================================================================*/ |
655 | /* Support for /proc/mtd */ | |
656 | ||
1da177e4 LT |
657 | static struct proc_dir_entry *proc_mtd; |
658 | ||
f1332ba2 | 659 | static inline int mtd_proc_info(char *buf, struct mtd_info *this) |
1da177e4 | 660 | { |
f1332ba2 | 661 | return sprintf(buf, "mtd%d: %8.8llx %8.8x \"%s\"\n", this->index, |
69423d99 | 662 | (unsigned long long)this->size, |
1da177e4 LT |
663 | this->erasesize, this->name); |
664 | } | |
665 | ||
666 | static int mtd_read_proc (char *page, char **start, off_t off, int count, | |
667 | int *eof, void *data_unused) | |
668 | { | |
f1332ba2 BH |
669 | struct mtd_info *mtd; |
670 | int len, l; | |
1da177e4 LT |
671 | off_t begin = 0; |
672 | ||
48b19268 | 673 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
674 | |
675 | len = sprintf(page, "dev: size erasesize name\n"); | |
f1332ba2 BH |
676 | mtd_for_each_device(mtd) { |
677 | l = mtd_proc_info(page + len, mtd); | |
1da177e4 LT |
678 | len += l; |
679 | if (len+begin > off+count) | |
680 | goto done; | |
681 | if (len+begin < off) { | |
682 | begin += len; | |
683 | len = 0; | |
684 | } | |
685 | } | |
686 | ||
687 | *eof = 1; | |
688 | ||
689 | done: | |
48b19268 | 690 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
691 | if (off >= len+begin) |
692 | return 0; | |
693 | *start = page + (off-begin); | |
694 | return ((count < begin+len-off) ? count : begin+len-off); | |
695 | } | |
696 | ||
45b09076 KC |
697 | #endif /* CONFIG_PROC_FS */ |
698 | ||
1da177e4 LT |
699 | /*====================================================================*/ |
700 | /* Init code */ | |
701 | ||
0661b1ac JA |
702 | static int __init mtd_bdi_init(struct backing_dev_info *bdi, const char *name) |
703 | { | |
704 | int ret; | |
705 | ||
706 | ret = bdi_init(bdi); | |
707 | if (!ret) | |
708 | ret = bdi_register(bdi, NULL, name); | |
709 | ||
710 | if (ret) | |
711 | bdi_destroy(bdi); | |
712 | ||
713 | return ret; | |
714 | } | |
715 | ||
1da177e4 LT |
716 | static int __init init_mtd(void) |
717 | { | |
15bce40c | 718 | int ret; |
0661b1ac | 719 | |
15bce40c | 720 | ret = class_register(&mtd_class); |
0661b1ac JA |
721 | if (ret) |
722 | goto err_reg; | |
723 | ||
724 | ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap"); | |
725 | if (ret) | |
726 | goto err_bdi1; | |
727 | ||
728 | ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap"); | |
729 | if (ret) | |
730 | goto err_bdi2; | |
731 | ||
732 | ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap"); | |
733 | if (ret) | |
734 | goto err_bdi3; | |
694bb7fc | 735 | |
45b09076 | 736 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
737 | if ((proc_mtd = create_proc_entry( "mtd", 0, NULL ))) |
738 | proc_mtd->read_proc = mtd_read_proc; | |
45b09076 | 739 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 740 | return 0; |
0661b1ac JA |
741 | |
742 | err_bdi3: | |
743 | bdi_destroy(&mtd_bdi_ro_mappable); | |
744 | err_bdi2: | |
745 | bdi_destroy(&mtd_bdi_unmappable); | |
746 | err_bdi1: | |
747 | class_unregister(&mtd_class); | |
748 | err_reg: | |
749 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
750 | return ret; | |
1da177e4 LT |
751 | } |
752 | ||
753 | static void __exit cleanup_mtd(void) | |
754 | { | |
45b09076 | 755 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
756 | if (proc_mtd) |
757 | remove_proc_entry( "mtd", NULL); | |
45b09076 | 758 | #endif /* CONFIG_PROC_FS */ |
15bce40c | 759 | class_unregister(&mtd_class); |
0661b1ac JA |
760 | bdi_destroy(&mtd_bdi_unmappable); |
761 | bdi_destroy(&mtd_bdi_ro_mappable); | |
762 | bdi_destroy(&mtd_bdi_rw_mappable); | |
1da177e4 LT |
763 | } |
764 | ||
765 | module_init(init_mtd); | |
766 | module_exit(cleanup_mtd); | |
767 | ||
1da177e4 LT |
768 | MODULE_LICENSE("GPL"); |
769 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
770 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |