Commit | Line | Data |
---|---|---|
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> |
a33eb6b9 | 22 | #include <linux/backing-dev.h> |
1da177e4 LT |
23 | |
24 | #include <linux/mtd/mtd.h> | |
25 | ||
356d70f1 | 26 | #include "mtdcore.h" |
a33eb6b9 JE |
27 | /* |
28 | * backing device capabilities for non-mappable devices (such as NAND flash) | |
29 | * - permits private mappings, copies are taken of the data | |
30 | */ | |
31 | struct backing_dev_info mtd_bdi_unmappable = { | |
32 | .capabilities = BDI_CAP_MAP_COPY, | |
33 | }; | |
34 | ||
35 | /* | |
36 | * backing device capabilities for R/O mappable devices (such as ROM) | |
37 | * - permits private mappings, copies are taken of the data | |
38 | * - permits non-writable shared mappings | |
39 | */ | |
40 | struct backing_dev_info mtd_bdi_ro_mappable = { | |
41 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | | |
42 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), | |
43 | }; | |
44 | ||
45 | /* | |
46 | * backing device capabilities for writable mappable devices (such as RAM) | |
47 | * - permits private mappings, copies are taken of the data | |
48 | * - permits non-writable shared mappings | |
49 | */ | |
50 | struct backing_dev_info mtd_bdi_rw_mappable = { | |
51 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | | |
52 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | | |
53 | BDI_CAP_WRITE_MAP), | |
54 | }; | |
356d70f1 | 55 | |
15bce40c DW |
56 | static int mtd_cls_suspend(struct device *dev, pm_message_t state); |
57 | static int mtd_cls_resume(struct device *dev); | |
58 | ||
59 | static struct class mtd_class = { | |
60 | .name = "mtd", | |
61 | .owner = THIS_MODULE, | |
62 | .suspend = mtd_cls_suspend, | |
63 | .resume = mtd_cls_resume, | |
64 | }; | |
1f24b5a8 | 65 | |
97894cda | 66 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 67 | should not use them for _anything_ else */ |
48b19268 | 68 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 LT |
69 | struct mtd_info *mtd_table[MAX_MTD_DEVICES]; |
70 | ||
71 | EXPORT_SYMBOL_GPL(mtd_table_mutex); | |
72 | EXPORT_SYMBOL_GPL(mtd_table); | |
73 | ||
74 | static LIST_HEAD(mtd_notifiers); | |
75 | ||
1f24b5a8 DB |
76 | |
77 | #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) | |
78 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) | |
79 | #else | |
80 | #define MTD_DEVT(index) 0 | |
81 | #endif | |
82 | ||
83 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
84 | * the mtd_info will probably want to use the release() hook... | |
85 | */ | |
86 | static void mtd_release(struct device *dev) | |
87 | { | |
2fdb1144 | 88 | dev_t index = MTD_DEVT(dev_to_mtd(dev)->index); |
1f24b5a8 DB |
89 | |
90 | /* remove /dev/mtdXro node if needed */ | |
2fdb1144 | 91 | if (index) |
15bce40c DW |
92 | device_destroy(&mtd_class, index + 1); |
93 | } | |
94 | ||
95 | static int mtd_cls_suspend(struct device *dev, pm_message_t state) | |
96 | { | |
97 | struct mtd_info *mtd = dev_to_mtd(dev); | |
6afc4fdb SB |
98 | |
99 | if (mtd && mtd->suspend) | |
15bce40c DW |
100 | return mtd->suspend(mtd); |
101 | else | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int mtd_cls_resume(struct device *dev) | |
106 | { | |
107 | struct mtd_info *mtd = dev_to_mtd(dev); | |
108 | ||
6afc4fdb | 109 | if (mtd && mtd->resume) |
15bce40c DW |
110 | mtd->resume(mtd); |
111 | return 0; | |
1f24b5a8 DB |
112 | } |
113 | ||
114 | static ssize_t mtd_type_show(struct device *dev, | |
115 | struct device_attribute *attr, char *buf) | |
116 | { | |
117 | struct mtd_info *mtd = dev_to_mtd(dev); | |
118 | char *type; | |
119 | ||
120 | switch (mtd->type) { | |
121 | case MTD_ABSENT: | |
122 | type = "absent"; | |
123 | break; | |
124 | case MTD_RAM: | |
125 | type = "ram"; | |
126 | break; | |
127 | case MTD_ROM: | |
128 | type = "rom"; | |
129 | break; | |
130 | case MTD_NORFLASH: | |
131 | type = "nor"; | |
132 | break; | |
133 | case MTD_NANDFLASH: | |
134 | type = "nand"; | |
135 | break; | |
136 | case MTD_DATAFLASH: | |
137 | type = "dataflash"; | |
138 | break; | |
139 | case MTD_UBIVOLUME: | |
140 | type = "ubi"; | |
141 | break; | |
142 | default: | |
143 | type = "unknown"; | |
144 | } | |
145 | ||
146 | return snprintf(buf, PAGE_SIZE, "%s\n", type); | |
147 | } | |
694bb7fc KC |
148 | static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL); |
149 | ||
150 | static ssize_t mtd_flags_show(struct device *dev, | |
151 | struct device_attribute *attr, char *buf) | |
152 | { | |
153 | struct mtd_info *mtd = dev_to_mtd(dev); | |
154 | ||
155 | return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags); | |
156 | ||
157 | } | |
158 | static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL); | |
159 | ||
160 | static ssize_t mtd_size_show(struct device *dev, | |
161 | struct device_attribute *attr, char *buf) | |
162 | { | |
163 | struct mtd_info *mtd = dev_to_mtd(dev); | |
164 | ||
165 | return snprintf(buf, PAGE_SIZE, "%llu\n", | |
166 | (unsigned long long)mtd->size); | |
167 | ||
168 | } | |
169 | static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL); | |
170 | ||
171 | static ssize_t mtd_erasesize_show(struct device *dev, | |
172 | struct device_attribute *attr, char *buf) | |
173 | { | |
174 | struct mtd_info *mtd = dev_to_mtd(dev); | |
175 | ||
176 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize); | |
177 | ||
178 | } | |
179 | static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL); | |
180 | ||
181 | static ssize_t mtd_writesize_show(struct device *dev, | |
182 | struct device_attribute *attr, char *buf) | |
183 | { | |
184 | struct mtd_info *mtd = dev_to_mtd(dev); | |
185 | ||
186 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize); | |
187 | ||
188 | } | |
189 | static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL); | |
190 | ||
e7693548 AB |
191 | static ssize_t mtd_subpagesize_show(struct device *dev, |
192 | struct device_attribute *attr, char *buf) | |
193 | { | |
194 | struct mtd_info *mtd = dev_to_mtd(dev); | |
195 | unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft; | |
196 | ||
197 | return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize); | |
198 | ||
199 | } | |
200 | static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL); | |
201 | ||
694bb7fc KC |
202 | static ssize_t mtd_oobsize_show(struct device *dev, |
203 | struct device_attribute *attr, char *buf) | |
204 | { | |
205 | struct mtd_info *mtd = dev_to_mtd(dev); | |
206 | ||
207 | return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize); | |
208 | ||
209 | } | |
210 | static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL); | |
211 | ||
212 | static ssize_t mtd_numeraseregions_show(struct device *dev, | |
213 | struct device_attribute *attr, char *buf) | |
214 | { | |
215 | struct mtd_info *mtd = dev_to_mtd(dev); | |
216 | ||
217 | return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions); | |
218 | ||
219 | } | |
220 | static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show, | |
221 | NULL); | |
222 | ||
223 | static ssize_t mtd_name_show(struct device *dev, | |
224 | struct device_attribute *attr, char *buf) | |
225 | { | |
226 | struct mtd_info *mtd = dev_to_mtd(dev); | |
227 | ||
228 | return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name); | |
229 | ||
230 | } | |
231 | static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL); | |
1f24b5a8 DB |
232 | |
233 | static struct attribute *mtd_attrs[] = { | |
694bb7fc KC |
234 | &dev_attr_type.attr, |
235 | &dev_attr_flags.attr, | |
236 | &dev_attr_size.attr, | |
237 | &dev_attr_erasesize.attr, | |
238 | &dev_attr_writesize.attr, | |
e7693548 | 239 | &dev_attr_subpagesize.attr, |
694bb7fc KC |
240 | &dev_attr_oobsize.attr, |
241 | &dev_attr_numeraseregions.attr, | |
242 | &dev_attr_name.attr, | |
1f24b5a8 DB |
243 | NULL, |
244 | }; | |
245 | ||
fca91088 | 246 | static struct attribute_group mtd_group = { |
1f24b5a8 DB |
247 | .attrs = mtd_attrs, |
248 | }; | |
249 | ||
6469f540 | 250 | static const struct attribute_group *mtd_groups[] = { |
1f24b5a8 DB |
251 | &mtd_group, |
252 | NULL, | |
253 | }; | |
254 | ||
255 | static struct device_type mtd_devtype = { | |
256 | .name = "mtd", | |
257 | .groups = mtd_groups, | |
258 | .release = mtd_release, | |
259 | }; | |
260 | ||
1da177e4 LT |
261 | /** |
262 | * add_mtd_device - register an MTD device | |
263 | * @mtd: pointer to new MTD device info structure | |
264 | * | |
265 | * Add a device to the list of MTD devices present in the system, and | |
266 | * notify each currently active MTD 'user' of its arrival. Returns | |
267 | * zero on success or 1 on failure, which currently will only happen | |
268 | * if the number of present devices exceeds MAX_MTD_DEVICES (i.e. 16) | |
1f24b5a8 | 269 | * or there's a sysfs error. |
1da177e4 LT |
270 | */ |
271 | ||
272 | int add_mtd_device(struct mtd_info *mtd) | |
273 | { | |
274 | int i; | |
275 | ||
402d3265 DH |
276 | if (!mtd->backing_dev_info) { |
277 | switch (mtd->type) { | |
278 | case MTD_RAM: | |
279 | mtd->backing_dev_info = &mtd_bdi_rw_mappable; | |
280 | break; | |
281 | case MTD_ROM: | |
282 | mtd->backing_dev_info = &mtd_bdi_ro_mappable; | |
283 | break; | |
284 | default: | |
285 | mtd->backing_dev_info = &mtd_bdi_unmappable; | |
286 | break; | |
287 | } | |
288 | } | |
289 | ||
783ed81f | 290 | BUG_ON(mtd->writesize == 0); |
48b19268 | 291 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
292 | |
293 | for (i=0; i < MAX_MTD_DEVICES; i++) | |
294 | if (!mtd_table[i]) { | |
2606c797 | 295 | struct mtd_notifier *not; |
1da177e4 LT |
296 | |
297 | mtd_table[i] = mtd; | |
298 | mtd->index = i; | |
299 | mtd->usecount = 0; | |
300 | ||
69423d99 AH |
301 | if (is_power_of_2(mtd->erasesize)) |
302 | mtd->erasesize_shift = ffs(mtd->erasesize) - 1; | |
303 | else | |
304 | mtd->erasesize_shift = 0; | |
305 | ||
306 | if (is_power_of_2(mtd->writesize)) | |
307 | mtd->writesize_shift = ffs(mtd->writesize) - 1; | |
308 | else | |
309 | mtd->writesize_shift = 0; | |
310 | ||
311 | mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1; | |
312 | mtd->writesize_mask = (1 << mtd->writesize_shift) - 1; | |
313 | ||
187ef152 HS |
314 | /* Some chips always power up locked. Unlock them now */ |
315 | if ((mtd->flags & MTD_WRITEABLE) | |
e619a75f | 316 | && (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) { |
187ef152 HS |
317 | if (mtd->unlock(mtd, 0, mtd->size)) |
318 | printk(KERN_WARNING | |
319 | "%s: unlock failed, " | |
320 | "writes may not work\n", | |
321 | mtd->name); | |
322 | } | |
323 | ||
1f24b5a8 DB |
324 | /* Caller should have set dev.parent to match the |
325 | * physical device. | |
326 | */ | |
327 | mtd->dev.type = &mtd_devtype; | |
15bce40c | 328 | mtd->dev.class = &mtd_class; |
1f24b5a8 DB |
329 | mtd->dev.devt = MTD_DEVT(i); |
330 | dev_set_name(&mtd->dev, "mtd%d", i); | |
6afc4fdb | 331 | dev_set_drvdata(&mtd->dev, mtd); |
1f24b5a8 DB |
332 | if (device_register(&mtd->dev) != 0) { |
333 | mtd_table[i] = NULL; | |
334 | break; | |
335 | } | |
336 | ||
337 | if (MTD_DEVT(i)) | |
15bce40c | 338 | device_create(&mtd_class, mtd->dev.parent, |
1f24b5a8 DB |
339 | MTD_DEVT(i) + 1, |
340 | NULL, "mtd%dro", i); | |
341 | ||
1da177e4 LT |
342 | DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name); |
343 | /* No need to get a refcount on the module containing | |
344 | the notifier, since we hold the mtd_table_mutex */ | |
71a928c0 | 345 | list_for_each_entry(not, &mtd_notifiers, list) |
1da177e4 | 346 | not->add(mtd); |
97894cda | 347 | |
48b19268 | 348 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
349 | /* We _know_ we aren't being removed, because |
350 | our caller is still holding us here. So none | |
351 | of this try_ nonsense, and no bitching about it | |
352 | either. :) */ | |
353 | __module_get(THIS_MODULE); | |
354 | return 0; | |
355 | } | |
97894cda | 356 | |
48b19268 | 357 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
358 | return 1; |
359 | } | |
360 | ||
361 | /** | |
362 | * del_mtd_device - unregister an MTD device | |
363 | * @mtd: pointer to MTD device info structure | |
364 | * | |
365 | * Remove a device from the list of MTD devices present in the system, | |
366 | * and notify each currently active MTD 'user' of its departure. | |
367 | * Returns zero on success or 1 on failure, which currently will happen | |
368 | * if the requested device does not appear to be present in the list. | |
369 | */ | |
370 | ||
371 | int del_mtd_device (struct mtd_info *mtd) | |
372 | { | |
373 | int ret; | |
97894cda | 374 | |
48b19268 | 375 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
376 | |
377 | if (mtd_table[mtd->index] != mtd) { | |
378 | ret = -ENODEV; | |
379 | } else if (mtd->usecount) { | |
97894cda | 380 | printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", |
1da177e4 LT |
381 | mtd->index, mtd->name, mtd->usecount); |
382 | ret = -EBUSY; | |
383 | } else { | |
856613c9 | 384 | struct mtd_notifier *not; |
1da177e4 | 385 | |
694bb7fc KC |
386 | device_unregister(&mtd->dev); |
387 | ||
1da177e4 LT |
388 | /* No need to get a refcount on the module containing |
389 | the notifier, since we hold the mtd_table_mutex */ | |
71a928c0 | 390 | list_for_each_entry(not, &mtd_notifiers, list) |
1da177e4 | 391 | not->remove(mtd); |
1da177e4 LT |
392 | |
393 | mtd_table[mtd->index] = NULL; | |
394 | ||
395 | module_put(THIS_MODULE); | |
396 | ret = 0; | |
397 | } | |
398 | ||
48b19268 | 399 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
400 | return ret; |
401 | } | |
402 | ||
403 | /** | |
404 | * register_mtd_user - register a 'user' of MTD devices. | |
405 | * @new: pointer to notifier info structure | |
406 | * | |
407 | * Registers a pair of callbacks function to be called upon addition | |
408 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
409 | * invoked for each MTD device currently present in the system. | |
410 | */ | |
411 | ||
412 | void register_mtd_user (struct mtd_notifier *new) | |
413 | { | |
414 | int i; | |
415 | ||
48b19268 | 416 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
417 | |
418 | list_add(&new->list, &mtd_notifiers); | |
419 | ||
420 | __module_get(THIS_MODULE); | |
97894cda | 421 | |
1da177e4 LT |
422 | for (i=0; i< MAX_MTD_DEVICES; i++) |
423 | if (mtd_table[i]) | |
424 | new->add(mtd_table[i]); | |
425 | ||
48b19268 | 426 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
427 | } |
428 | ||
429 | /** | |
49450795 AB |
430 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
431 | * @old: pointer to notifier info structure | |
1da177e4 LT |
432 | * |
433 | * Removes a callback function pair from the list of 'users' to be | |
434 | * notified upon addition or removal of MTD devices. Causes the | |
435 | * 'remove' callback to be immediately invoked for each MTD device | |
436 | * currently present in the system. | |
437 | */ | |
438 | ||
439 | int unregister_mtd_user (struct mtd_notifier *old) | |
440 | { | |
441 | int i; | |
442 | ||
48b19268 | 443 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
444 | |
445 | module_put(THIS_MODULE); | |
446 | ||
447 | for (i=0; i< MAX_MTD_DEVICES; i++) | |
448 | if (mtd_table[i]) | |
449 | old->remove(mtd_table[i]); | |
97894cda | 450 | |
1da177e4 | 451 | list_del(&old->list); |
48b19268 | 452 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
453 | return 0; |
454 | } | |
455 | ||
456 | ||
457 | /** | |
458 | * get_mtd_device - obtain a validated handle for an MTD device | |
459 | * @mtd: last known address of the required MTD device | |
460 | * @num: internal device number of the required MTD device | |
461 | * | |
462 | * Given a number and NULL address, return the num'th entry in the device | |
463 | * table, if any. Given an address and num == -1, search the device table | |
464 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
465 | * both, return the num'th driver only if its address matches. Return |
466 | * error code if not. | |
1da177e4 | 467 | */ |
97894cda | 468 | |
1da177e4 LT |
469 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
470 | { | |
471 | struct mtd_info *ret = NULL; | |
9c74034f | 472 | int i, err = -ENODEV; |
1da177e4 | 473 | |
48b19268 | 474 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
475 | |
476 | if (num == -1) { | |
477 | for (i=0; i< MAX_MTD_DEVICES; i++) | |
478 | if (mtd_table[i] == mtd) | |
479 | ret = mtd_table[i]; | |
35016dd7 | 480 | } else if (num >= 0 && num < MAX_MTD_DEVICES) { |
1da177e4 LT |
481 | ret = mtd_table[num]; |
482 | if (mtd && mtd != ret) | |
483 | ret = NULL; | |
484 | } | |
485 | ||
9fe912ce AB |
486 | if (!ret) |
487 | goto out_unlock; | |
488 | ||
9c74034f | 489 | if (!try_module_get(ret->owner)) |
9fe912ce | 490 | goto out_unlock; |
9fe912ce | 491 | |
9c74034f AB |
492 | if (ret->get_device) { |
493 | err = ret->get_device(ret); | |
494 | if (err) | |
495 | goto out_put; | |
9fe912ce | 496 | } |
1da177e4 | 497 | |
9fe912ce | 498 | ret->usecount++; |
9c74034f AB |
499 | mutex_unlock(&mtd_table_mutex); |
500 | return ret; | |
1da177e4 | 501 | |
9c74034f AB |
502 | out_put: |
503 | module_put(ret->owner); | |
9fe912ce | 504 | out_unlock: |
48b19268 | 505 | mutex_unlock(&mtd_table_mutex); |
9c74034f | 506 | return ERR_PTR(err); |
1da177e4 LT |
507 | } |
508 | ||
7799308f AB |
509 | /** |
510 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
511 | * device name | |
512 | * @name: MTD device name to open | |
513 | * | |
514 | * This function returns MTD device description structure in case of | |
515 | * success and an error code in case of failure. | |
516 | */ | |
517 | ||
518 | struct mtd_info *get_mtd_device_nm(const char *name) | |
519 | { | |
9fe912ce AB |
520 | int i, err = -ENODEV; |
521 | struct mtd_info *mtd = NULL; | |
7799308f AB |
522 | |
523 | mutex_lock(&mtd_table_mutex); | |
524 | ||
525 | for (i = 0; i < MAX_MTD_DEVICES; i++) { | |
526 | if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) { | |
527 | mtd = mtd_table[i]; | |
528 | break; | |
529 | } | |
530 | } | |
531 | ||
9fe912ce | 532 | if (!mtd) |
7799308f AB |
533 | goto out_unlock; |
534 | ||
535 | if (!try_module_get(mtd->owner)) | |
536 | goto out_unlock; | |
537 | ||
9fe912ce AB |
538 | if (mtd->get_device) { |
539 | err = mtd->get_device(mtd); | |
540 | if (err) | |
541 | goto out_put; | |
542 | } | |
543 | ||
7799308f | 544 | mtd->usecount++; |
9fe912ce AB |
545 | mutex_unlock(&mtd_table_mutex); |
546 | return mtd; | |
7799308f | 547 | |
9fe912ce AB |
548 | out_put: |
549 | module_put(mtd->owner); | |
7799308f AB |
550 | out_unlock: |
551 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 552 | return ERR_PTR(err); |
7799308f AB |
553 | } |
554 | ||
1da177e4 LT |
555 | void put_mtd_device(struct mtd_info *mtd) |
556 | { | |
557 | int c; | |
558 | ||
48b19268 | 559 | mutex_lock(&mtd_table_mutex); |
1da177e4 | 560 | c = --mtd->usecount; |
9fe912ce AB |
561 | if (mtd->put_device) |
562 | mtd->put_device(mtd); | |
48b19268 | 563 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
564 | BUG_ON(c < 0); |
565 | ||
566 | module_put(mtd->owner); | |
567 | } | |
568 | ||
569 | /* default_mtd_writev - default mtd writev method for MTD devices that | |
dd36f267 | 570 | * don't implement their own |
1da177e4 LT |
571 | */ |
572 | ||
573 | int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
574 | unsigned long count, loff_t to, size_t *retlen) | |
575 | { | |
576 | unsigned long i; | |
577 | size_t totlen = 0, thislen; | |
578 | int ret = 0; | |
579 | ||
580 | if(!mtd->write) { | |
581 | ret = -EROFS; | |
582 | } else { | |
583 | for (i=0; i<count; i++) { | |
584 | if (!vecs[i].iov_len) | |
585 | continue; | |
586 | ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base); | |
587 | totlen += thislen; | |
588 | if (ret || thislen != vecs[i].iov_len) | |
589 | break; | |
590 | to += vecs[i].iov_len; | |
591 | } | |
592 | } | |
593 | if (retlen) | |
594 | *retlen = totlen; | |
595 | return ret; | |
596 | } | |
597 | ||
dd36f267 DW |
598 | EXPORT_SYMBOL_GPL(add_mtd_device); |
599 | EXPORT_SYMBOL_GPL(del_mtd_device); | |
600 | EXPORT_SYMBOL_GPL(get_mtd_device); | |
601 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); | |
602 | EXPORT_SYMBOL_GPL(put_mtd_device); | |
603 | EXPORT_SYMBOL_GPL(register_mtd_user); | |
604 | EXPORT_SYMBOL_GPL(unregister_mtd_user); | |
605 | EXPORT_SYMBOL_GPL(default_mtd_writev); | |
1da177e4 | 606 | |
2d2dce0e PM |
607 | #ifdef CONFIG_PROC_FS |
608 | ||
1da177e4 LT |
609 | /*====================================================================*/ |
610 | /* Support for /proc/mtd */ | |
611 | ||
1da177e4 LT |
612 | static struct proc_dir_entry *proc_mtd; |
613 | ||
614 | static inline int mtd_proc_info (char *buf, int i) | |
615 | { | |
616 | struct mtd_info *this = mtd_table[i]; | |
617 | ||
618 | if (!this) | |
619 | return 0; | |
620 | ||
69423d99 AH |
621 | return sprintf(buf, "mtd%d: %8.8llx %8.8x \"%s\"\n", i, |
622 | (unsigned long long)this->size, | |
1da177e4 LT |
623 | this->erasesize, this->name); |
624 | } | |
625 | ||
626 | static int mtd_read_proc (char *page, char **start, off_t off, int count, | |
627 | int *eof, void *data_unused) | |
628 | { | |
629 | int len, l, i; | |
630 | off_t begin = 0; | |
631 | ||
48b19268 | 632 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
633 | |
634 | len = sprintf(page, "dev: size erasesize name\n"); | |
635 | for (i=0; i< MAX_MTD_DEVICES; i++) { | |
636 | ||
637 | l = mtd_proc_info(page + len, i); | |
638 | len += l; | |
639 | if (len+begin > off+count) | |
640 | goto done; | |
641 | if (len+begin < off) { | |
642 | begin += len; | |
643 | len = 0; | |
644 | } | |
645 | } | |
646 | ||
647 | *eof = 1; | |
648 | ||
649 | done: | |
48b19268 | 650 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
651 | if (off >= len+begin) |
652 | return 0; | |
653 | *start = page + (off-begin); | |
654 | return ((count < begin+len-off) ? count : begin+len-off); | |
655 | } | |
656 | ||
45b09076 KC |
657 | #endif /* CONFIG_PROC_FS */ |
658 | ||
1da177e4 LT |
659 | /*====================================================================*/ |
660 | /* Init code */ | |
661 | ||
662 | static int __init init_mtd(void) | |
663 | { | |
15bce40c DW |
664 | int ret; |
665 | ret = class_register(&mtd_class); | |
694bb7fc | 666 | |
15bce40c DW |
667 | if (ret) { |
668 | pr_err("Error registering mtd class: %d\n", ret); | |
669 | return ret; | |
694bb7fc | 670 | } |
45b09076 | 671 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
672 | if ((proc_mtd = create_proc_entry( "mtd", 0, NULL ))) |
673 | proc_mtd->read_proc = mtd_read_proc; | |
45b09076 | 674 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
675 | return 0; |
676 | } | |
677 | ||
678 | static void __exit cleanup_mtd(void) | |
679 | { | |
45b09076 | 680 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
681 | if (proc_mtd) |
682 | remove_proc_entry( "mtd", NULL); | |
45b09076 | 683 | #endif /* CONFIG_PROC_FS */ |
15bce40c | 684 | class_unregister(&mtd_class); |
1da177e4 LT |
685 | } |
686 | ||
687 | module_init(init_mtd); | |
688 | module_exit(cleanup_mtd); | |
689 | ||
1da177e4 LT |
690 | MODULE_LICENSE("GPL"); |
691 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
692 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |