Commit | Line | Data |
---|---|---|
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> |
447d9bd8 | 27 | #include <linux/seq_file.h> |
1da177e4 LT |
28 | #include <linux/string.h> |
29 | #include <linux/timer.h> | |
30 | #include <linux/major.h> | |
31 | #include <linux/fs.h> | |
7799308f | 32 | #include <linux/err.h> |
1da177e4 LT |
33 | #include <linux/ioctl.h> |
34 | #include <linux/init.h> | |
1da177e4 | 35 | #include <linux/proc_fs.h> |
b520e412 | 36 | #include <linux/idr.h> |
a33eb6b9 | 37 | #include <linux/backing-dev.h> |
05d71b46 | 38 | #include <linux/gfp.h> |
1da177e4 LT |
39 | |
40 | #include <linux/mtd/mtd.h> | |
f5671ab3 | 41 | #include <linux/mtd/partitions.h> |
1da177e4 | 42 | |
356d70f1 | 43 | #include "mtdcore.h" |
a33eb6b9 JE |
44 | /* |
45 | * backing device capabilities for non-mappable devices (such as NAND flash) | |
46 | * - permits private mappings, copies are taken of the data | |
47 | */ | |
ca91facf | 48 | static struct backing_dev_info mtd_bdi_unmappable = { |
a33eb6b9 JE |
49 | .capabilities = BDI_CAP_MAP_COPY, |
50 | }; | |
51 | ||
52 | /* | |
53 | * backing device capabilities for R/O mappable devices (such as ROM) | |
54 | * - permits private mappings, copies are taken of the data | |
55 | * - permits non-writable shared mappings | |
56 | */ | |
ca91facf | 57 | static struct backing_dev_info mtd_bdi_ro_mappable = { |
a33eb6b9 JE |
58 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | |
59 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP), | |
60 | }; | |
61 | ||
62 | /* | |
63 | * backing device capabilities for writable mappable devices (such as RAM) | |
64 | * - permits private mappings, copies are taken of the data | |
65 | * - permits non-writable shared mappings | |
66 | */ | |
ca91facf | 67 | static struct backing_dev_info mtd_bdi_rw_mappable = { |
a33eb6b9 JE |
68 | .capabilities = (BDI_CAP_MAP_COPY | BDI_CAP_MAP_DIRECT | |
69 | BDI_CAP_EXEC_MAP | BDI_CAP_READ_MAP | | |
70 | BDI_CAP_WRITE_MAP), | |
71 | }; | |
356d70f1 | 72 | |
15bce40c DW |
73 | static int mtd_cls_suspend(struct device *dev, pm_message_t state); |
74 | static int mtd_cls_resume(struct device *dev); | |
75 | ||
76 | static struct class mtd_class = { | |
77 | .name = "mtd", | |
78 | .owner = THIS_MODULE, | |
79 | .suspend = mtd_cls_suspend, | |
80 | .resume = mtd_cls_resume, | |
81 | }; | |
1f24b5a8 | 82 | |
b520e412 BH |
83 | static DEFINE_IDR(mtd_idr); |
84 | ||
97894cda | 85 | /* These are exported solely for the purpose of mtd_blkdevs.c. You |
1da177e4 | 86 | should not use them for _anything_ else */ |
48b19268 | 87 | DEFINE_MUTEX(mtd_table_mutex); |
1da177e4 | 88 | EXPORT_SYMBOL_GPL(mtd_table_mutex); |
b520e412 BH |
89 | |
90 | struct mtd_info *__mtd_next_device(int i) | |
91 | { | |
92 | return idr_get_next(&mtd_idr, &i); | |
93 | } | |
94 | EXPORT_SYMBOL_GPL(__mtd_next_device); | |
1da177e4 LT |
95 | |
96 | static LIST_HEAD(mtd_notifiers); | |
97 | ||
1f24b5a8 DB |
98 | |
99 | #if defined(CONFIG_MTD_CHAR) || defined(CONFIG_MTD_CHAR_MODULE) | |
100 | #define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2) | |
101 | #else | |
102 | #define MTD_DEVT(index) 0 | |
103 | #endif | |
104 | ||
105 | /* REVISIT once MTD uses the driver model better, whoever allocates | |
106 | * the mtd_info will probably want to use the release() hook... | |
107 | */ | |
108 | static void mtd_release(struct device *dev) | |
109 | { | |
335a5f40 | 110 | struct mtd_info __maybe_unused *mtd = dev_get_drvdata(dev); |
d5de20a9 | 111 | dev_t index = MTD_DEVT(mtd->index); |
1f24b5a8 DB |
112 | |
113 | /* remove /dev/mtdXro node if needed */ | |
2fdb1144 | 114 | if (index) |
15bce40c DW |
115 | device_destroy(&mtd_class, index + 1); |
116 | } | |
117 | ||
118 | static int mtd_cls_suspend(struct device *dev, pm_message_t state) | |
119 | { | |
d5de20a9 | 120 | struct mtd_info *mtd = dev_get_drvdata(dev); |
6afc4fdb | 121 | |
1a30871f | 122 | return mtd ? mtd_suspend(mtd) : 0; |
15bce40c DW |
123 | } |
124 | ||
125 | static int mtd_cls_resume(struct device *dev) | |
126 | { | |
d5de20a9 | 127 | struct mtd_info *mtd = dev_get_drvdata(dev); |
33c87b4a | 128 | |
3ee50141 | 129 | if (mtd) |
ead995f8 | 130 | mtd_resume(mtd); |
15bce40c | 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 | { | |
d5de20a9 | 137 | struct mtd_info *mtd = dev_get_drvdata(dev); |
1f24b5a8 DB |
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 | { | |
d5de20a9 | 173 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
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 | { | |
d5de20a9 | 183 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
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 | { | |
d5de20a9 | 194 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
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 | { | |
d5de20a9 | 204 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
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 | { | |
d5de20a9 | 214 | struct mtd_info *mtd = dev_get_drvdata(dev); |
e7693548 AB |
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 | { | |
d5de20a9 | 225 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
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 | { | |
d5de20a9 | 235 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
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 | { | |
d5de20a9 | 246 | struct mtd_info *mtd = dev_get_drvdata(dev); |
694bb7fc KC |
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 */ | |
38134565 AB |
339 | if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) { |
340 | error = mtd_unlock(mtd, 0, mtd->size); | |
341 | if (error && error != -EOPNOTSUPP) | |
b520e412 BH |
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 | ||
289c0522 | 363 | pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name); |
b520e412 BH |
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 | ||
eea72d5f | 394 | int del_mtd_device(struct mtd_info *mtd) |
1da177e4 LT |
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 | ||
1c4c215c DES |
429 | /** |
430 | * mtd_device_parse_register - parse partitions and register an MTD device. | |
431 | * | |
432 | * @mtd: the MTD device to register | |
433 | * @types: the list of MTD partition probes to try, see | |
434 | * 'parse_mtd_partitions()' for more information | |
c7975330 | 435 | * @parser_data: MTD partition parser-specific data |
1c4c215c DES |
436 | * @parts: fallback partition information to register, if parsing fails; |
437 | * only valid if %nr_parts > %0 | |
438 | * @nr_parts: the number of partitions in parts, if zero then the full | |
439 | * MTD device is registered if no partition info is found | |
440 | * | |
441 | * This function aggregates MTD partitions parsing (done by | |
442 | * 'parse_mtd_partitions()') and MTD device and partitions registering. It | |
443 | * basically follows the most common pattern found in many MTD drivers: | |
444 | * | |
445 | * * It first tries to probe partitions on MTD device @mtd using parsers | |
446 | * specified in @types (if @types is %NULL, then the default list of parsers | |
447 | * is used, see 'parse_mtd_partitions()' for more information). If none are | |
448 | * found this functions tries to fallback to information specified in | |
449 | * @parts/@nr_parts. | |
92394b5c | 450 | * * If any partitioning info was found, this function registers the found |
1c4c215c DES |
451 | * partitions. |
452 | * * If no partitions were found this function just registers the MTD device | |
453 | * @mtd and exits. | |
454 | * | |
455 | * Returns zero in case of success and a negative error code in case of failure. | |
456 | */ | |
457 | int mtd_device_parse_register(struct mtd_info *mtd, const char **types, | |
c7975330 | 458 | struct mtd_part_parser_data *parser_data, |
1c4c215c DES |
459 | const struct mtd_partition *parts, |
460 | int nr_parts) | |
461 | { | |
462 | int err; | |
463 | struct mtd_partition *real_parts; | |
464 | ||
c7975330 | 465 | err = parse_mtd_partitions(mtd, types, &real_parts, parser_data); |
4d523b60 | 466 | if (err <= 0 && nr_parts && parts) { |
1c4c215c DES |
467 | real_parts = kmemdup(parts, sizeof(*parts) * nr_parts, |
468 | GFP_KERNEL); | |
4d523b60 | 469 | if (!real_parts) |
1c4c215c | 470 | err = -ENOMEM; |
4d523b60 JL |
471 | else |
472 | err = nr_parts; | |
1c4c215c DES |
473 | } |
474 | ||
475 | if (err > 0) { | |
476 | err = add_mtd_partitions(mtd, real_parts, err); | |
477 | kfree(real_parts); | |
478 | } else if (err == 0) { | |
479 | err = add_mtd_device(mtd); | |
480 | if (err == 1) | |
481 | err = -ENODEV; | |
482 | } | |
483 | ||
484 | return err; | |
485 | } | |
486 | EXPORT_SYMBOL_GPL(mtd_device_parse_register); | |
487 | ||
f5671ab3 JI |
488 | /** |
489 | * mtd_device_unregister - unregister an existing MTD device. | |
490 | * | |
491 | * @master: the MTD device to unregister. This will unregister both the master | |
492 | * and any partitions if registered. | |
493 | */ | |
494 | int mtd_device_unregister(struct mtd_info *master) | |
495 | { | |
496 | int err; | |
497 | ||
498 | err = del_mtd_partitions(master); | |
499 | if (err) | |
500 | return err; | |
501 | ||
502 | if (!device_is_registered(&master->dev)) | |
503 | return 0; | |
504 | ||
505 | return del_mtd_device(master); | |
506 | } | |
507 | EXPORT_SYMBOL_GPL(mtd_device_unregister); | |
508 | ||
1da177e4 LT |
509 | /** |
510 | * register_mtd_user - register a 'user' of MTD devices. | |
511 | * @new: pointer to notifier info structure | |
512 | * | |
513 | * Registers a pair of callbacks function to be called upon addition | |
514 | * or removal of MTD devices. Causes the 'add' callback to be immediately | |
515 | * invoked for each MTD device currently present in the system. | |
516 | */ | |
1da177e4 LT |
517 | void register_mtd_user (struct mtd_notifier *new) |
518 | { | |
f1332ba2 | 519 | struct mtd_info *mtd; |
1da177e4 | 520 | |
48b19268 | 521 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
522 | |
523 | list_add(&new->list, &mtd_notifiers); | |
524 | ||
d5ca5129 | 525 | __module_get(THIS_MODULE); |
97894cda | 526 | |
f1332ba2 BH |
527 | mtd_for_each_device(mtd) |
528 | new->add(mtd); | |
1da177e4 | 529 | |
48b19268 | 530 | mutex_unlock(&mtd_table_mutex); |
1da177e4 | 531 | } |
33c87b4a | 532 | EXPORT_SYMBOL_GPL(register_mtd_user); |
1da177e4 LT |
533 | |
534 | /** | |
49450795 AB |
535 | * unregister_mtd_user - unregister a 'user' of MTD devices. |
536 | * @old: pointer to notifier info structure | |
1da177e4 LT |
537 | * |
538 | * Removes a callback function pair from the list of 'users' to be | |
539 | * notified upon addition or removal of MTD devices. Causes the | |
540 | * 'remove' callback to be immediately invoked for each MTD device | |
541 | * currently present in the system. | |
542 | */ | |
1da177e4 LT |
543 | int unregister_mtd_user (struct mtd_notifier *old) |
544 | { | |
f1332ba2 | 545 | struct mtd_info *mtd; |
1da177e4 | 546 | |
48b19268 | 547 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
548 | |
549 | module_put(THIS_MODULE); | |
550 | ||
f1332ba2 BH |
551 | mtd_for_each_device(mtd) |
552 | old->remove(mtd); | |
97894cda | 553 | |
1da177e4 | 554 | list_del(&old->list); |
48b19268 | 555 | mutex_unlock(&mtd_table_mutex); |
1da177e4 LT |
556 | return 0; |
557 | } | |
33c87b4a | 558 | EXPORT_SYMBOL_GPL(unregister_mtd_user); |
1da177e4 LT |
559 | |
560 | /** | |
561 | * get_mtd_device - obtain a validated handle for an MTD device | |
562 | * @mtd: last known address of the required MTD device | |
563 | * @num: internal device number of the required MTD device | |
564 | * | |
565 | * Given a number and NULL address, return the num'th entry in the device | |
566 | * table, if any. Given an address and num == -1, search the device table | |
567 | * for a device with that address and return if it's still present. Given | |
9c74034f AB |
568 | * both, return the num'th driver only if its address matches. Return |
569 | * error code if not. | |
1da177e4 | 570 | */ |
1da177e4 LT |
571 | struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num) |
572 | { | |
f1332ba2 BH |
573 | struct mtd_info *ret = NULL, *other; |
574 | int err = -ENODEV; | |
1da177e4 | 575 | |
48b19268 | 576 | mutex_lock(&mtd_table_mutex); |
1da177e4 LT |
577 | |
578 | if (num == -1) { | |
f1332ba2 BH |
579 | mtd_for_each_device(other) { |
580 | if (other == mtd) { | |
581 | ret = mtd; | |
582 | break; | |
583 | } | |
584 | } | |
b520e412 BH |
585 | } else if (num >= 0) { |
586 | ret = idr_find(&mtd_idr, num); | |
1da177e4 LT |
587 | if (mtd && mtd != ret) |
588 | ret = NULL; | |
589 | } | |
590 | ||
3bd45657 ML |
591 | if (!ret) { |
592 | ret = ERR_PTR(err); | |
593 | goto out; | |
9fe912ce | 594 | } |
1da177e4 | 595 | |
3bd45657 ML |
596 | err = __get_mtd_device(ret); |
597 | if (err) | |
598 | ret = ERR_PTR(err); | |
599 | out: | |
9c74034f AB |
600 | mutex_unlock(&mtd_table_mutex); |
601 | return ret; | |
3bd45657 | 602 | } |
33c87b4a | 603 | EXPORT_SYMBOL_GPL(get_mtd_device); |
1da177e4 | 604 | |
3bd45657 ML |
605 | |
606 | int __get_mtd_device(struct mtd_info *mtd) | |
607 | { | |
608 | int err; | |
609 | ||
610 | if (!try_module_get(mtd->owner)) | |
611 | return -ENODEV; | |
612 | ||
3c3c10bb AB |
613 | if (mtd->_get_device) { |
614 | err = mtd->_get_device(mtd); | |
3bd45657 ML |
615 | |
616 | if (err) { | |
617 | module_put(mtd->owner); | |
618 | return err; | |
619 | } | |
620 | } | |
621 | mtd->usecount++; | |
622 | return 0; | |
1da177e4 | 623 | } |
33c87b4a | 624 | EXPORT_SYMBOL_GPL(__get_mtd_device); |
1da177e4 | 625 | |
7799308f AB |
626 | /** |
627 | * get_mtd_device_nm - obtain a validated handle for an MTD device by | |
628 | * device name | |
629 | * @name: MTD device name to open | |
630 | * | |
631 | * This function returns MTD device description structure in case of | |
632 | * success and an error code in case of failure. | |
633 | */ | |
7799308f AB |
634 | struct mtd_info *get_mtd_device_nm(const char *name) |
635 | { | |
f1332ba2 BH |
636 | int err = -ENODEV; |
637 | struct mtd_info *mtd = NULL, *other; | |
7799308f AB |
638 | |
639 | mutex_lock(&mtd_table_mutex); | |
640 | ||
f1332ba2 BH |
641 | mtd_for_each_device(other) { |
642 | if (!strcmp(name, other->name)) { | |
643 | mtd = other; | |
7799308f AB |
644 | break; |
645 | } | |
646 | } | |
647 | ||
9fe912ce | 648 | if (!mtd) |
7799308f AB |
649 | goto out_unlock; |
650 | ||
52534f2d WG |
651 | err = __get_mtd_device(mtd); |
652 | if (err) | |
7799308f AB |
653 | goto out_unlock; |
654 | ||
9fe912ce AB |
655 | mutex_unlock(&mtd_table_mutex); |
656 | return mtd; | |
7799308f AB |
657 | |
658 | out_unlock: | |
659 | mutex_unlock(&mtd_table_mutex); | |
9fe912ce | 660 | return ERR_PTR(err); |
7799308f | 661 | } |
33c87b4a | 662 | EXPORT_SYMBOL_GPL(get_mtd_device_nm); |
7799308f | 663 | |
1da177e4 LT |
664 | void put_mtd_device(struct mtd_info *mtd) |
665 | { | |
48b19268 | 666 | mutex_lock(&mtd_table_mutex); |
3bd45657 ML |
667 | __put_mtd_device(mtd); |
668 | mutex_unlock(&mtd_table_mutex); | |
669 | ||
670 | } | |
33c87b4a | 671 | EXPORT_SYMBOL_GPL(put_mtd_device); |
3bd45657 ML |
672 | |
673 | void __put_mtd_device(struct mtd_info *mtd) | |
674 | { | |
675 | --mtd->usecount; | |
676 | BUG_ON(mtd->usecount < 0); | |
677 | ||
3c3c10bb AB |
678 | if (mtd->_put_device) |
679 | mtd->_put_device(mtd); | |
1da177e4 LT |
680 | |
681 | module_put(mtd->owner); | |
682 | } | |
33c87b4a | 683 | EXPORT_SYMBOL_GPL(__put_mtd_device); |
1da177e4 | 684 | |
8273a0c9 AB |
685 | /* |
686 | * Erase is an asynchronous operation. Device drivers are supposed | |
687 | * to call instr->callback() whenever the operation completes, even | |
688 | * if it completes with a failure. | |
689 | * Callers are supposed to pass a callback function and wait for it | |
690 | * to be called before writing to the block. | |
691 | */ | |
692 | int mtd_erase(struct mtd_info *mtd, struct erase_info *instr) | |
693 | { | |
694 | if (instr->addr > mtd->size || instr->len > mtd->size - instr->addr) | |
695 | return -EINVAL; | |
664addc2 AB |
696 | if (!(mtd->flags & MTD_WRITEABLE)) |
697 | return -EROFS; | |
bcb1d238 AB |
698 | if (!instr->len) { |
699 | instr->state = MTD_ERASE_DONE; | |
700 | mtd_erase_callback(instr); | |
701 | return 0; | |
702 | } | |
8273a0c9 AB |
703 | return mtd->_erase(mtd, instr); |
704 | } | |
705 | EXPORT_SYMBOL_GPL(mtd_erase); | |
706 | ||
707 | /* | |
708 | * This stuff for eXecute-In-Place. phys is optional and may be set to NULL. | |
709 | */ | |
710 | int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
711 | void **virt, resource_size_t *phys) | |
712 | { | |
713 | *retlen = 0; | |
0dd5235f AB |
714 | *virt = NULL; |
715 | if (phys) | |
716 | *phys = 0; | |
8273a0c9 AB |
717 | if (!mtd->_point) |
718 | return -EOPNOTSUPP; | |
719 | if (from < 0 || from > mtd->size || len > mtd->size - from) | |
720 | return -EINVAL; | |
bcb1d238 AB |
721 | if (!len) |
722 | return 0; | |
8273a0c9 AB |
723 | return mtd->_point(mtd, from, len, retlen, virt, phys); |
724 | } | |
725 | EXPORT_SYMBOL_GPL(mtd_point); | |
726 | ||
727 | /* We probably shouldn't allow XIP if the unpoint isn't a NULL */ | |
728 | int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len) | |
729 | { | |
730 | if (!mtd->_point) | |
731 | return -EOPNOTSUPP; | |
732 | if (from < 0 || from > mtd->size || len > mtd->size - from) | |
733 | return -EINVAL; | |
bcb1d238 AB |
734 | if (!len) |
735 | return 0; | |
8273a0c9 AB |
736 | return mtd->_unpoint(mtd, from, len); |
737 | } | |
738 | EXPORT_SYMBOL_GPL(mtd_unpoint); | |
739 | ||
740 | /* | |
741 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
742 | * - return the address to which the offset maps | |
743 | * - return -ENOSYS to indicate refusal to do the mapping | |
744 | */ | |
745 | unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len, | |
746 | unsigned long offset, unsigned long flags) | |
747 | { | |
748 | if (!mtd->_get_unmapped_area) | |
749 | return -EOPNOTSUPP; | |
750 | if (offset > mtd->size || len > mtd->size - offset) | |
751 | return -EINVAL; | |
752 | return mtd->_get_unmapped_area(mtd, len, offset, flags); | |
753 | } | |
754 | EXPORT_SYMBOL_GPL(mtd_get_unmapped_area); | |
755 | ||
756 | int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, | |
757 | u_char *buf) | |
758 | { | |
834247ec | 759 | *retlen = 0; |
8273a0c9 AB |
760 | if (from < 0 || from > mtd->size || len > mtd->size - from) |
761 | return -EINVAL; | |
bcb1d238 AB |
762 | if (!len) |
763 | return 0; | |
8273a0c9 AB |
764 | return mtd->_read(mtd, from, len, retlen, buf); |
765 | } | |
766 | EXPORT_SYMBOL_GPL(mtd_read); | |
767 | ||
768 | int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
769 | const u_char *buf) | |
770 | { | |
771 | *retlen = 0; | |
8273a0c9 AB |
772 | if (to < 0 || to > mtd->size || len > mtd->size - to) |
773 | return -EINVAL; | |
664addc2 AB |
774 | if (!mtd->_write || !(mtd->flags & MTD_WRITEABLE)) |
775 | return -EROFS; | |
bcb1d238 AB |
776 | if (!len) |
777 | return 0; | |
8273a0c9 AB |
778 | return mtd->_write(mtd, to, len, retlen, buf); |
779 | } | |
780 | EXPORT_SYMBOL_GPL(mtd_write); | |
781 | ||
782 | /* | |
783 | * In blackbox flight recorder like scenarios we want to make successful writes | |
784 | * in interrupt context. panic_write() is only intended to be called when its | |
785 | * known the kernel is about to panic and we need the write to succeed. Since | |
786 | * the kernel is not going to be running for much longer, this function can | |
787 | * break locks and delay to ensure the write succeeds (but not sleep). | |
788 | */ | |
789 | int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, | |
790 | const u_char *buf) | |
791 | { | |
792 | *retlen = 0; | |
793 | if (!mtd->_panic_write) | |
794 | return -EOPNOTSUPP; | |
795 | if (to < 0 || to > mtd->size || len > mtd->size - to) | |
796 | return -EINVAL; | |
664addc2 AB |
797 | if (!(mtd->flags & MTD_WRITEABLE)) |
798 | return -EROFS; | |
bcb1d238 AB |
799 | if (!len) |
800 | return 0; | |
8273a0c9 AB |
801 | return mtd->_panic_write(mtd, to, len, retlen, buf); |
802 | } | |
803 | EXPORT_SYMBOL_GPL(mtd_panic_write); | |
804 | ||
de3cac93 AB |
805 | /* |
806 | * Method to access the protection register area, present in some flash | |
807 | * devices. The user data is one time programmable but the factory data is read | |
808 | * only. | |
809 | */ | |
810 | int mtd_get_fact_prot_info(struct mtd_info *mtd, struct otp_info *buf, | |
811 | size_t len) | |
812 | { | |
813 | if (!mtd->_get_fact_prot_info) | |
814 | return -EOPNOTSUPP; | |
815 | if (!len) | |
816 | return 0; | |
817 | return mtd->_get_fact_prot_info(mtd, buf, len); | |
818 | } | |
819 | EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info); | |
820 | ||
821 | int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
822 | size_t *retlen, u_char *buf) | |
823 | { | |
824 | *retlen = 0; | |
825 | if (!mtd->_read_fact_prot_reg) | |
826 | return -EOPNOTSUPP; | |
827 | if (!len) | |
828 | return 0; | |
829 | return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf); | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg); | |
832 | ||
833 | int mtd_get_user_prot_info(struct mtd_info *mtd, struct otp_info *buf, | |
834 | size_t len) | |
835 | { | |
836 | if (!mtd->_get_user_prot_info) | |
837 | return -EOPNOTSUPP; | |
838 | if (!len) | |
839 | return 0; | |
840 | return mtd->_get_user_prot_info(mtd, buf, len); | |
841 | } | |
842 | EXPORT_SYMBOL_GPL(mtd_get_user_prot_info); | |
843 | ||
844 | int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len, | |
845 | size_t *retlen, u_char *buf) | |
846 | { | |
847 | *retlen = 0; | |
848 | if (!mtd->_read_user_prot_reg) | |
849 | return -EOPNOTSUPP; | |
850 | if (!len) | |
851 | return 0; | |
852 | return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf); | |
853 | } | |
854 | EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg); | |
855 | ||
856 | int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len, | |
857 | size_t *retlen, u_char *buf) | |
858 | { | |
859 | *retlen = 0; | |
860 | if (!mtd->_write_user_prot_reg) | |
861 | return -EOPNOTSUPP; | |
862 | if (!len) | |
863 | return 0; | |
864 | return mtd->_write_user_prot_reg(mtd, to, len, retlen, buf); | |
865 | } | |
866 | EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg); | |
867 | ||
868 | int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len) | |
869 | { | |
870 | if (!mtd->_lock_user_prot_reg) | |
871 | return -EOPNOTSUPP; | |
872 | if (!len) | |
873 | return 0; | |
874 | return mtd->_lock_user_prot_reg(mtd, from, len); | |
875 | } | |
876 | EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg); | |
877 | ||
8273a0c9 AB |
878 | /* Chip-supported device locking */ |
879 | int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
880 | { | |
881 | if (!mtd->_lock) | |
882 | return -EOPNOTSUPP; | |
883 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
884 | return -EINVAL; | |
bcb1d238 AB |
885 | if (!len) |
886 | return 0; | |
8273a0c9 AB |
887 | return mtd->_lock(mtd, ofs, len); |
888 | } | |
889 | EXPORT_SYMBOL_GPL(mtd_lock); | |
890 | ||
891 | int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
892 | { | |
893 | if (!mtd->_unlock) | |
894 | return -EOPNOTSUPP; | |
895 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
896 | return -EINVAL; | |
bcb1d238 AB |
897 | if (!len) |
898 | return 0; | |
8273a0c9 AB |
899 | return mtd->_unlock(mtd, ofs, len); |
900 | } | |
901 | EXPORT_SYMBOL_GPL(mtd_unlock); | |
902 | ||
903 | int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len) | |
904 | { | |
905 | if (!mtd->_is_locked) | |
906 | return -EOPNOTSUPP; | |
907 | if (ofs < 0 || ofs > mtd->size || len > mtd->size - ofs) | |
908 | return -EINVAL; | |
bcb1d238 AB |
909 | if (!len) |
910 | return 0; | |
8273a0c9 AB |
911 | return mtd->_is_locked(mtd, ofs, len); |
912 | } | |
913 | EXPORT_SYMBOL_GPL(mtd_is_locked); | |
914 | ||
915 | int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs) | |
916 | { | |
917 | if (!mtd->_block_isbad) | |
918 | return 0; | |
919 | if (ofs < 0 || ofs > mtd->size) | |
920 | return -EINVAL; | |
921 | return mtd->_block_isbad(mtd, ofs); | |
922 | } | |
923 | EXPORT_SYMBOL_GPL(mtd_block_isbad); | |
924 | ||
925 | int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs) | |
926 | { | |
927 | if (!mtd->_block_markbad) | |
928 | return -EOPNOTSUPP; | |
929 | if (ofs < 0 || ofs > mtd->size) | |
930 | return -EINVAL; | |
664addc2 AB |
931 | if (!(mtd->flags & MTD_WRITEABLE)) |
932 | return -EROFS; | |
8273a0c9 AB |
933 | return mtd->_block_markbad(mtd, ofs); |
934 | } | |
935 | EXPORT_SYMBOL_GPL(mtd_block_markbad); | |
936 | ||
52b02031 AB |
937 | /* |
938 | * default_mtd_writev - the default writev method | |
939 | * @mtd: mtd device description object pointer | |
940 | * @vecs: the vectors to write | |
941 | * @count: count of vectors in @vecs | |
942 | * @to: the MTD device offset to write to | |
943 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
944 | * | |
945 | * This function returns zero in case of success and a negative error code in | |
946 | * case of failure. | |
1da177e4 | 947 | */ |
1dbebd32 AB |
948 | static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, |
949 | unsigned long count, loff_t to, size_t *retlen) | |
1da177e4 LT |
950 | { |
951 | unsigned long i; | |
952 | size_t totlen = 0, thislen; | |
953 | int ret = 0; | |
954 | ||
52b02031 AB |
955 | for (i = 0; i < count; i++) { |
956 | if (!vecs[i].iov_len) | |
957 | continue; | |
958 | ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen, | |
959 | vecs[i].iov_base); | |
960 | totlen += thislen; | |
961 | if (ret || thislen != vecs[i].iov_len) | |
962 | break; | |
963 | to += vecs[i].iov_len; | |
1da177e4 | 964 | } |
52b02031 | 965 | *retlen = totlen; |
1da177e4 LT |
966 | return ret; |
967 | } | |
1dbebd32 AB |
968 | |
969 | /* | |
970 | * mtd_writev - the vector-based MTD write method | |
971 | * @mtd: mtd device description object pointer | |
972 | * @vecs: the vectors to write | |
973 | * @count: count of vectors in @vecs | |
974 | * @to: the MTD device offset to write to | |
975 | * @retlen: on exit contains the count of bytes written to the MTD device. | |
976 | * | |
977 | * This function returns zero in case of success and a negative error code in | |
978 | * case of failure. | |
979 | */ | |
980 | int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs, | |
981 | unsigned long count, loff_t to, size_t *retlen) | |
982 | { | |
983 | *retlen = 0; | |
664addc2 AB |
984 | if (!(mtd->flags & MTD_WRITEABLE)) |
985 | return -EROFS; | |
3c3c10bb | 986 | if (!mtd->_writev) |
1dbebd32 | 987 | return default_mtd_writev(mtd, vecs, count, to, retlen); |
3c3c10bb | 988 | return mtd->_writev(mtd, vecs, count, to, retlen); |
1dbebd32 AB |
989 | } |
990 | EXPORT_SYMBOL_GPL(mtd_writev); | |
1da177e4 | 991 | |
33b53716 GE |
992 | /** |
993 | * mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size | |
52b02031 AB |
994 | * @mtd: mtd device description object pointer |
995 | * @size: a pointer to the ideal or maximum size of the allocation, points | |
33b53716 GE |
996 | * to the actual allocation size on success. |
997 | * | |
998 | * This routine attempts to allocate a contiguous kernel buffer up to | |
999 | * the specified size, backing off the size of the request exponentially | |
1000 | * until the request succeeds or until the allocation size falls below | |
1001 | * the system page size. This attempts to make sure it does not adversely | |
1002 | * impact system performance, so when allocating more than one page, we | |
1003 | * ask the memory allocator to avoid re-trying, swapping, writing back | |
1004 | * or performing I/O. | |
1005 | * | |
1006 | * Note, this function also makes sure that the allocated buffer is aligned to | |
1007 | * the MTD device's min. I/O unit, i.e. the "mtd->writesize" value. | |
1008 | * | |
1009 | * This is called, for example by mtd_{read,write} and jffs2_scan_medium, | |
1010 | * to handle smaller (i.e. degraded) buffer allocations under low- or | |
1011 | * fragmented-memory situations where such reduced allocations, from a | |
1012 | * requested ideal, are allowed. | |
1013 | * | |
1014 | * Returns a pointer to the allocated buffer on success; otherwise, NULL. | |
1015 | */ | |
1016 | void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size) | |
1017 | { | |
1018 | gfp_t flags = __GFP_NOWARN | __GFP_WAIT | | |
1019 | __GFP_NORETRY | __GFP_NO_KSWAPD; | |
1020 | size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE); | |
1021 | void *kbuf; | |
1022 | ||
1023 | *size = min_t(size_t, *size, KMALLOC_MAX_SIZE); | |
1024 | ||
1025 | while (*size > min_alloc) { | |
1026 | kbuf = kmalloc(*size, flags); | |
1027 | if (kbuf) | |
1028 | return kbuf; | |
1029 | ||
1030 | *size >>= 1; | |
1031 | *size = ALIGN(*size, mtd->writesize); | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * For the last resort allocation allow 'kmalloc()' to do all sorts of | |
1036 | * things (write-back, dropping caches, etc) by using GFP_KERNEL. | |
1037 | */ | |
1038 | return kmalloc(*size, GFP_KERNEL); | |
1039 | } | |
33b53716 | 1040 | EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to); |
1da177e4 | 1041 | |
2d2dce0e PM |
1042 | #ifdef CONFIG_PROC_FS |
1043 | ||
1da177e4 LT |
1044 | /*====================================================================*/ |
1045 | /* Support for /proc/mtd */ | |
1046 | ||
1da177e4 LT |
1047 | static struct proc_dir_entry *proc_mtd; |
1048 | ||
447d9bd8 | 1049 | static int mtd_proc_show(struct seq_file *m, void *v) |
1da177e4 | 1050 | { |
f1332ba2 | 1051 | struct mtd_info *mtd; |
1da177e4 | 1052 | |
447d9bd8 | 1053 | seq_puts(m, "dev: size erasesize name\n"); |
48b19268 | 1054 | mutex_lock(&mtd_table_mutex); |
f1332ba2 | 1055 | mtd_for_each_device(mtd) { |
447d9bd8 AD |
1056 | seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n", |
1057 | mtd->index, (unsigned long long)mtd->size, | |
1058 | mtd->erasesize, mtd->name); | |
d5ca5129 | 1059 | } |
48b19268 | 1060 | mutex_unlock(&mtd_table_mutex); |
d5ca5129 | 1061 | return 0; |
1da177e4 LT |
1062 | } |
1063 | ||
447d9bd8 AD |
1064 | static int mtd_proc_open(struct inode *inode, struct file *file) |
1065 | { | |
1066 | return single_open(file, mtd_proc_show, NULL); | |
1067 | } | |
1068 | ||
1069 | static const struct file_operations mtd_proc_ops = { | |
1070 | .open = mtd_proc_open, | |
1071 | .read = seq_read, | |
1072 | .llseek = seq_lseek, | |
1073 | .release = single_release, | |
1074 | }; | |
45b09076 KC |
1075 | #endif /* CONFIG_PROC_FS */ |
1076 | ||
1da177e4 LT |
1077 | /*====================================================================*/ |
1078 | /* Init code */ | |
1079 | ||
0661b1ac JA |
1080 | static int __init mtd_bdi_init(struct backing_dev_info *bdi, const char *name) |
1081 | { | |
1082 | int ret; | |
1083 | ||
1084 | ret = bdi_init(bdi); | |
1085 | if (!ret) | |
1086 | ret = bdi_register(bdi, NULL, name); | |
1087 | ||
1088 | if (ret) | |
1089 | bdi_destroy(bdi); | |
1090 | ||
1091 | return ret; | |
1092 | } | |
1093 | ||
1da177e4 LT |
1094 | static int __init init_mtd(void) |
1095 | { | |
15bce40c | 1096 | int ret; |
0661b1ac | 1097 | |
15bce40c | 1098 | ret = class_register(&mtd_class); |
0661b1ac JA |
1099 | if (ret) |
1100 | goto err_reg; | |
1101 | ||
1102 | ret = mtd_bdi_init(&mtd_bdi_unmappable, "mtd-unmap"); | |
1103 | if (ret) | |
1104 | goto err_bdi1; | |
1105 | ||
1106 | ret = mtd_bdi_init(&mtd_bdi_ro_mappable, "mtd-romap"); | |
1107 | if (ret) | |
1108 | goto err_bdi2; | |
1109 | ||
1110 | ret = mtd_bdi_init(&mtd_bdi_rw_mappable, "mtd-rwmap"); | |
1111 | if (ret) | |
1112 | goto err_bdi3; | |
694bb7fc | 1113 | |
45b09076 | 1114 | #ifdef CONFIG_PROC_FS |
447d9bd8 | 1115 | proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops); |
45b09076 | 1116 | #endif /* CONFIG_PROC_FS */ |
1da177e4 | 1117 | return 0; |
0661b1ac JA |
1118 | |
1119 | err_bdi3: | |
1120 | bdi_destroy(&mtd_bdi_ro_mappable); | |
1121 | err_bdi2: | |
1122 | bdi_destroy(&mtd_bdi_unmappable); | |
1123 | err_bdi1: | |
1124 | class_unregister(&mtd_class); | |
1125 | err_reg: | |
1126 | pr_err("Error registering mtd class or bdi: %d\n", ret); | |
1127 | return ret; | |
1da177e4 LT |
1128 | } |
1129 | ||
1130 | static void __exit cleanup_mtd(void) | |
1131 | { | |
45b09076 | 1132 | #ifdef CONFIG_PROC_FS |
d5ca5129 | 1133 | if (proc_mtd) |
1da177e4 | 1134 | remove_proc_entry( "mtd", NULL); |
45b09076 | 1135 | #endif /* CONFIG_PROC_FS */ |
15bce40c | 1136 | class_unregister(&mtd_class); |
0661b1ac JA |
1137 | bdi_destroy(&mtd_bdi_unmappable); |
1138 | bdi_destroy(&mtd_bdi_ro_mappable); | |
1139 | bdi_destroy(&mtd_bdi_rw_mappable); | |
1da177e4 LT |
1140 | } |
1141 | ||
1142 | module_init(init_mtd); | |
1143 | module_exit(cleanup_mtd); | |
1144 | ||
1da177e4 LT |
1145 | MODULE_LICENSE("GPL"); |
1146 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
1147 | MODULE_DESCRIPTION("Core MTD registration and access routines"); |