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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sysfs.h - definitions for the device driver filesystem | |
3 | * | |
4 | * Copyright (c) 2001,2002 Patrick Mochel | |
5 | * Copyright (c) 2004 Silicon Graphics, Inc. | |
6d66f5cd TH |
6 | * Copyright (c) 2007 SUSE Linux Products GmbH |
7 | * Copyright (c) 2007 Tejun Heo <teheo@suse.de> | |
1da177e4 LT |
8 | * |
9 | * Please see Documentation/filesystems/sysfs.txt for more information. | |
10 | */ | |
11 | ||
12 | #ifndef _SYSFS_H_ | |
13 | #define _SYSFS_H_ | |
14 | ||
b8441ed2 | 15 | #include <linux/kernfs.h> |
4a7fb636 | 16 | #include <linux/compiler.h> |
5851fadc | 17 | #include <linux/errno.h> |
bf0acc33 | 18 | #include <linux/list.h> |
6992f533 | 19 | #include <linux/lockdep.h> |
8488a38f | 20 | #include <linux/kobject_ns.h> |
3493f69f | 21 | #include <linux/stat.h> |
60063497 | 22 | #include <linux/atomic.h> |
1da177e4 LT |
23 | |
24 | struct kobject; | |
25 | struct module; | |
6ab9cea1 | 26 | struct bin_attribute; |
3ff195b0 | 27 | enum kobj_ns_type; |
1da177e4 LT |
28 | |
29 | struct attribute { | |
59f69015 | 30 | const char *name; |
9104e427 | 31 | umode_t mode; |
6992f533 | 32 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
356c05d5 | 33 | bool ignore_lockdep:1; |
6992f533 EB |
34 | struct lock_class_key *key; |
35 | struct lock_class_key skey; | |
36 | #endif | |
1da177e4 LT |
37 | }; |
38 | ||
35960258 EB |
39 | /** |
40 | * sysfs_attr_init - initialize a dynamically allocated sysfs attribute | |
41 | * @attr: struct attribute to initialize | |
42 | * | |
43 | * Initialize a dynamically allocated struct attribute so we can | |
44 | * make lockdep happy. This is a new requirement for attributes | |
45 | * and initially this is only needed when lockdep is enabled. | |
46 | * Lockdep gives a nice error when your attribute is added to | |
47 | * sysfs if you don't have this. | |
48 | */ | |
6992f533 EB |
49 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
50 | #define sysfs_attr_init(attr) \ | |
51 | do { \ | |
52 | static struct lock_class_key __key; \ | |
53 | \ | |
54 | (attr)->key = &__key; \ | |
5da5c9c8 | 55 | } while (0) |
6992f533 | 56 | #else |
5da5c9c8 | 57 | #define sysfs_attr_init(attr) do {} while (0) |
6992f533 EB |
58 | #endif |
59 | ||
1da177e4 | 60 | struct attribute_group { |
59f69015 | 61 | const char *name; |
587a1f16 | 62 | umode_t (*is_visible)(struct kobject *, |
d4acd722 | 63 | struct attribute *, int); |
59f69015 | 64 | struct attribute **attrs; |
6ab9cea1 | 65 | struct bin_attribute **bin_attrs; |
1da177e4 LT |
66 | }; |
67 | ||
1da177e4 LT |
68 | /** |
69 | * Use these macros to make defining attributes easier. See include/linux/device.h | |
70 | * for examples.. | |
71 | */ | |
72 | ||
5da5c9c8 | 73 | #define __ATTR(_name, _mode, _show, _store) { \ |
aa01aa3c OS |
74 | .attr = {.name = __stringify(_name), .mode = _mode }, \ |
75 | .show = _show, \ | |
76 | .store = _store, \ | |
1da177e4 LT |
77 | } |
78 | ||
aa01aa3c OS |
79 | #define __ATTR_RO(_name) { \ |
80 | .attr = { .name = __stringify(_name), .mode = S_IRUGO }, \ | |
81 | .show = _name##_show, \ | |
1da177e4 LT |
82 | } |
83 | ||
a65fcce7 GKH |
84 | #define __ATTR_WO(_name) { \ |
85 | .attr = { .name = __stringify(_name), .mode = S_IWUSR }, \ | |
86 | .store = _name##_store, \ | |
87 | } | |
88 | ||
aa01aa3c OS |
89 | #define __ATTR_RW(_name) __ATTR(_name, (S_IWUSR | S_IRUGO), \ |
90 | _name##_show, _name##_store) | |
b9b32597 | 91 | |
1da177e4 | 92 | #define __ATTR_NULL { .attr = { .name = NULL } } |
356c05d5 AS |
93 | |
94 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
95 | #define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) { \ | |
96 | .attr = {.name = __stringify(_name), .mode = _mode, \ | |
97 | .ignore_lockdep = true }, \ | |
98 | .show = _show, \ | |
99 | .store = _store, \ | |
100 | } | |
101 | #else | |
102 | #define __ATTR_IGNORE_LOCKDEP __ATTR | |
103 | #endif | |
1da177e4 | 104 | |
3493f69f OS |
105 | #define __ATTRIBUTE_GROUPS(_name) \ |
106 | static const struct attribute_group *_name##_groups[] = { \ | |
107 | &_name##_group, \ | |
f2f37f58 GKH |
108 | NULL, \ |
109 | } | |
110 | ||
3493f69f OS |
111 | #define ATTRIBUTE_GROUPS(_name) \ |
112 | static const struct attribute_group _name##_group = { \ | |
113 | .attrs = _name##_attrs, \ | |
114 | }; \ | |
115 | __ATTRIBUTE_GROUPS(_name) | |
116 | ||
2c3c8bea | 117 | struct file; |
1da177e4 LT |
118 | struct vm_area_struct; |
119 | ||
120 | struct bin_attribute { | |
121 | struct attribute attr; | |
122 | size_t size; | |
123 | void *private; | |
2c3c8bea | 124 | ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *, |
91a69029 | 125 | char *, loff_t, size_t); |
5da5c9c8 | 126 | ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *, |
91a69029 | 127 | char *, loff_t, size_t); |
2c3c8bea | 128 | int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr, |
1da177e4 LT |
129 | struct vm_area_struct *vma); |
130 | }; | |
131 | ||
35960258 EB |
132 | /** |
133 | * sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute | |
134 | * @attr: struct bin_attribute to initialize | |
135 | * | |
136 | * Initialize a dynamically allocated struct bin_attribute so we | |
137 | * can make lockdep happy. This is a new requirement for | |
138 | * attributes and initially this is only needed when lockdep is | |
139 | * enabled. Lockdep gives a nice error when your attribute is | |
140 | * added to sysfs if you don't have this. | |
141 | */ | |
62e877b8 | 142 | #define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr) |
6992f533 | 143 | |
3493f69f OS |
144 | /* macros to create static binary attributes easier */ |
145 | #define __BIN_ATTR(_name, _mode, _read, _write, _size) { \ | |
146 | .attr = { .name = __stringify(_name), .mode = _mode }, \ | |
147 | .read = _read, \ | |
148 | .write = _write, \ | |
149 | .size = _size, \ | |
150 | } | |
151 | ||
152 | #define __BIN_ATTR_RO(_name, _size) { \ | |
153 | .attr = { .name = __stringify(_name), .mode = S_IRUGO }, \ | |
154 | .read = _name##_read, \ | |
155 | .size = _size, \ | |
e4b63603 GKH |
156 | } |
157 | ||
3493f69f OS |
158 | #define __BIN_ATTR_RW(_name, _size) __BIN_ATTR(_name, \ |
159 | (S_IWUSR | S_IRUGO), _name##_read, \ | |
68531526 | 160 | _name##_write, _size) |
3493f69f OS |
161 | |
162 | #define __BIN_ATTR_NULL __ATTR_NULL | |
163 | ||
164 | #define BIN_ATTR(_name, _mode, _read, _write, _size) \ | |
165 | struct bin_attribute bin_attr_##_name = __BIN_ATTR(_name, _mode, _read, \ | |
166 | _write, _size) | |
167 | ||
168 | #define BIN_ATTR_RO(_name, _size) \ | |
169 | struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size) | |
170 | ||
171 | #define BIN_ATTR_RW(_name, _size) \ | |
172 | struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size) | |
173 | ||
1da177e4 | 174 | struct sysfs_ops { |
5da5c9c8 GKH |
175 | ssize_t (*show)(struct kobject *, struct attribute *, char *); |
176 | ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t); | |
1da177e4 LT |
177 | }; |
178 | ||
1da177e4 LT |
179 | #ifdef CONFIG_SYSFS |
180 | ||
59f69015 TH |
181 | int sysfs_schedule_callback(struct kobject *kobj, void (*func)(void *), |
182 | void *data, struct module *owner); | |
1da177e4 | 183 | |
e34ff490 | 184 | int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns); |
59f69015 | 185 | void sysfs_remove_dir(struct kobject *kobj); |
e34ff490 TH |
186 | int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name, |
187 | const void *new_ns); | |
188 | int __must_check sysfs_move_dir_ns(struct kobject *kobj, | |
189 | struct kobject *new_parent_kobj, | |
190 | const void *new_ns); | |
31e5abe9 | 191 | |
58292cbe TH |
192 | int __must_check sysfs_create_file_ns(struct kobject *kobj, |
193 | const struct attribute *attr, | |
194 | const void *ns); | |
1c205ae1 AK |
195 | int __must_check sysfs_create_files(struct kobject *kobj, |
196 | const struct attribute **attr); | |
49c19400 | 197 | int __must_check sysfs_chmod_file(struct kobject *kobj, |
48176a97 | 198 | const struct attribute *attr, umode_t mode); |
58292cbe TH |
199 | void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr, |
200 | const void *ns); | |
1c205ae1 | 201 | void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr); |
1da177e4 | 202 | |
4a7fb636 | 203 | int __must_check sysfs_create_bin_file(struct kobject *kobj, |
66ecb92b PC |
204 | const struct bin_attribute *attr); |
205 | void sysfs_remove_bin_file(struct kobject *kobj, | |
206 | const struct bin_attribute *attr); | |
1da177e4 | 207 | |
59f69015 TH |
208 | int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target, |
209 | const char *name); | |
36ce6dad CH |
210 | int __must_check sysfs_create_link_nowarn(struct kobject *kobj, |
211 | struct kobject *target, | |
212 | const char *name); | |
59f69015 TH |
213 | void sysfs_remove_link(struct kobject *kobj, const char *name); |
214 | ||
4b30ee58 TH |
215 | int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *target, |
216 | const char *old_name, const char *new_name, | |
217 | const void *new_ns); | |
7cb32942 | 218 | |
746edb7a EB |
219 | void sysfs_delete_link(struct kobject *dir, struct kobject *targ, |
220 | const char *name); | |
221 | ||
59f69015 TH |
222 | int __must_check sysfs_create_group(struct kobject *kobj, |
223 | const struct attribute_group *grp); | |
3e9b2bae GKH |
224 | int __must_check sysfs_create_groups(struct kobject *kobj, |
225 | const struct attribute_group **groups); | |
0f423895 JB |
226 | int sysfs_update_group(struct kobject *kobj, |
227 | const struct attribute_group *grp); | |
59f69015 TH |
228 | void sysfs_remove_group(struct kobject *kobj, |
229 | const struct attribute_group *grp); | |
3e9b2bae GKH |
230 | void sysfs_remove_groups(struct kobject *kobj, |
231 | const struct attribute_group **groups); | |
dfa87c82 | 232 | int sysfs_add_file_to_group(struct kobject *kobj, |
59f69015 | 233 | const struct attribute *attr, const char *group); |
dfa87c82 | 234 | void sysfs_remove_file_from_group(struct kobject *kobj, |
59f69015 | 235 | const struct attribute *attr, const char *group); |
69d44ffb AS |
236 | int sysfs_merge_group(struct kobject *kobj, |
237 | const struct attribute_group *grp); | |
238 | void sysfs_unmerge_group(struct kobject *kobj, | |
239 | const struct attribute_group *grp); | |
0bb8f3d6 RW |
240 | int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name, |
241 | struct kobject *target, const char *link_name); | |
242 | void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name, | |
243 | const char *link_name); | |
dfa87c82 | 244 | |
8c0e3998 | 245 | void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr); |
388975cc TH |
246 | struct sysfs_dirent *sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd, |
247 | const unsigned char *name, | |
248 | const void *ns); | |
f1282c84 NB |
249 | struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd); |
250 | void sysfs_put(struct sysfs_dirent *sd); | |
3ff195b0 | 251 | |
f1282c84 | 252 | int __must_check sysfs_init(void); |
f20a9ead | 253 | |
1da177e4 LT |
254 | #else /* CONFIG_SYSFS */ |
255 | ||
d9a9cdfb | 256 | static inline int sysfs_schedule_callback(struct kobject *kobj, |
523ded71 | 257 | void (*func)(void *), void *data, struct module *owner) |
d9a9cdfb AS |
258 | { |
259 | return -ENOSYS; | |
260 | } | |
261 | ||
e34ff490 | 262 | static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns) |
1da177e4 LT |
263 | { |
264 | return 0; | |
265 | } | |
266 | ||
59f69015 | 267 | static inline void sysfs_remove_dir(struct kobject *kobj) |
1da177e4 | 268 | { |
1da177e4 LT |
269 | } |
270 | ||
e34ff490 TH |
271 | static inline int sysfs_rename_dir_ns(struct kobject *kobj, |
272 | const char *new_name, const void *new_ns) | |
1da177e4 | 273 | { |
0b4a4fea | 274 | return 0; |
1da177e4 LT |
275 | } |
276 | ||
e34ff490 TH |
277 | static inline int sysfs_move_dir_ns(struct kobject *kobj, |
278 | struct kobject *new_parent_kobj, | |
279 | const void *new_ns) | |
8a82472f CH |
280 | { |
281 | return 0; | |
282 | } | |
283 | ||
58292cbe TH |
284 | static inline int sysfs_create_file_ns(struct kobject *kobj, |
285 | const struct attribute *attr, | |
286 | const void *ns) | |
1da177e4 LT |
287 | { |
288 | return 0; | |
289 | } | |
290 | ||
1c205ae1 AK |
291 | static inline int sysfs_create_files(struct kobject *kobj, |
292 | const struct attribute **attr) | |
293 | { | |
294 | return 0; | |
295 | } | |
296 | ||
59f69015 | 297 | static inline int sysfs_chmod_file(struct kobject *kobj, |
48176a97 | 298 | const struct attribute *attr, umode_t mode) |
31e5abe9 KS |
299 | { |
300 | return 0; | |
301 | } | |
1da177e4 | 302 | |
58292cbe TH |
303 | static inline void sysfs_remove_file_ns(struct kobject *kobj, |
304 | const struct attribute *attr, | |
305 | const void *ns) | |
1da177e4 | 306 | { |
1da177e4 LT |
307 | } |
308 | ||
1c205ae1 AK |
309 | static inline void sysfs_remove_files(struct kobject *kobj, |
310 | const struct attribute **attr) | |
311 | { | |
312 | } | |
313 | ||
59f69015 | 314 | static inline int sysfs_create_bin_file(struct kobject *kobj, |
66ecb92b | 315 | const struct bin_attribute *attr) |
1da177e4 LT |
316 | { |
317 | return 0; | |
318 | } | |
319 | ||
3612e06b | 320 | static inline void sysfs_remove_bin_file(struct kobject *kobj, |
66ecb92b | 321 | const struct bin_attribute *attr) |
1da177e4 | 322 | { |
1da177e4 LT |
323 | } |
324 | ||
59f69015 TH |
325 | static inline int sysfs_create_link(struct kobject *kobj, |
326 | struct kobject *target, const char *name) | |
1da177e4 LT |
327 | { |
328 | return 0; | |
329 | } | |
330 | ||
36ce6dad CH |
331 | static inline int sysfs_create_link_nowarn(struct kobject *kobj, |
332 | struct kobject *target, | |
333 | const char *name) | |
334 | { | |
335 | return 0; | |
336 | } | |
337 | ||
59f69015 | 338 | static inline void sysfs_remove_link(struct kobject *kobj, const char *name) |
1da177e4 | 339 | { |
1da177e4 LT |
340 | } |
341 | ||
4b30ee58 TH |
342 | static inline int sysfs_rename_link_ns(struct kobject *k, struct kobject *t, |
343 | const char *old_name, | |
344 | const char *new_name, const void *ns) | |
7cb32942 EB |
345 | { |
346 | return 0; | |
347 | } | |
348 | ||
746edb7a EB |
349 | static inline void sysfs_delete_link(struct kobject *k, struct kobject *t, |
350 | const char *name) | |
351 | { | |
352 | } | |
353 | ||
59f69015 TH |
354 | static inline int sysfs_create_group(struct kobject *kobj, |
355 | const struct attribute_group *grp) | |
1da177e4 LT |
356 | { |
357 | return 0; | |
358 | } | |
359 | ||
f7998780 GKH |
360 | static inline int sysfs_create_groups(struct kobject *kobj, |
361 | const struct attribute_group **groups) | |
362 | { | |
574979c6 | 363 | return 0; |
f7998780 GKH |
364 | } |
365 | ||
1cbfb7a5 RD |
366 | static inline int sysfs_update_group(struct kobject *kobj, |
367 | const struct attribute_group *grp) | |
368 | { | |
369 | return 0; | |
370 | } | |
371 | ||
59f69015 TH |
372 | static inline void sysfs_remove_group(struct kobject *kobj, |
373 | const struct attribute_group *grp) | |
1da177e4 | 374 | { |
1da177e4 LT |
375 | } |
376 | ||
f7998780 GKH |
377 | static inline void sysfs_remove_groups(struct kobject *kobj, |
378 | const struct attribute_group **groups) | |
379 | { | |
380 | } | |
381 | ||
dfa87c82 AS |
382 | static inline int sysfs_add_file_to_group(struct kobject *kobj, |
383 | const struct attribute *attr, const char *group) | |
384 | { | |
385 | return 0; | |
386 | } | |
387 | ||
388 | static inline void sysfs_remove_file_from_group(struct kobject *kobj, | |
d701d8a3 | 389 | const struct attribute *attr, const char *group) |
dfa87c82 | 390 | { |
dfa87c82 AS |
391 | } |
392 | ||
69d44ffb AS |
393 | static inline int sysfs_merge_group(struct kobject *kobj, |
394 | const struct attribute_group *grp) | |
395 | { | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static inline void sysfs_unmerge_group(struct kobject *kobj, | |
400 | const struct attribute_group *grp) | |
401 | { | |
402 | } | |
403 | ||
0bb8f3d6 RW |
404 | static inline int sysfs_add_link_to_group(struct kobject *kobj, |
405 | const char *group_name, struct kobject *target, | |
406 | const char *link_name) | |
407 | { | |
408 | return 0; | |
409 | } | |
410 | ||
411 | static inline void sysfs_remove_link_from_group(struct kobject *kobj, | |
412 | const char *group_name, const char *link_name) | |
413 | { | |
414 | } | |
415 | ||
8c0e3998 TP |
416 | static inline void sysfs_notify(struct kobject *kobj, const char *dir, |
417 | const char *attr) | |
4508a7a7 N |
418 | { |
419 | } | |
388975cc TH |
420 | static inline struct sysfs_dirent * |
421 | sysfs_get_dirent_ns(struct sysfs_dirent *parent_sd, const unsigned char *name, | |
422 | const void *ns) | |
f1282c84 NB |
423 | { |
424 | return NULL; | |
425 | } | |
426 | static inline struct sysfs_dirent *sysfs_get(struct sysfs_dirent *sd) | |
427 | { | |
428 | return NULL; | |
429 | } | |
430 | static inline void sysfs_put(struct sysfs_dirent *sd) | |
431 | { | |
432 | } | |
4508a7a7 | 433 | |
f20a9ead AM |
434 | static inline int __must_check sysfs_init(void) |
435 | { | |
436 | return 0; | |
437 | } | |
438 | ||
1da177e4 LT |
439 | #endif /* CONFIG_SYSFS */ |
440 | ||
58292cbe TH |
441 | static inline int __must_check sysfs_create_file(struct kobject *kobj, |
442 | const struct attribute *attr) | |
443 | { | |
444 | return sysfs_create_file_ns(kobj, attr, NULL); | |
445 | } | |
446 | ||
447 | static inline void sysfs_remove_file(struct kobject *kobj, | |
448 | const struct attribute *attr) | |
449 | { | |
450 | return sysfs_remove_file_ns(kobj, attr, NULL); | |
451 | } | |
452 | ||
4b30ee58 TH |
453 | static inline int sysfs_rename_link(struct kobject *kobj, struct kobject *target, |
454 | const char *old_name, const char *new_name) | |
455 | { | |
456 | return sysfs_rename_link_ns(kobj, target, old_name, new_name, NULL); | |
457 | } | |
458 | ||
388975cc TH |
459 | static inline struct sysfs_dirent * |
460 | sysfs_get_dirent(struct sysfs_dirent *parent_sd, const unsigned char *name) | |
461 | { | |
462 | return sysfs_get_dirent_ns(parent_sd, name, NULL); | |
463 | } | |
464 | ||
024f6471 TH |
465 | static inline void sysfs_notify_dirent(struct sysfs_dirent *sd) |
466 | { | |
467 | kernfs_notify(sd); | |
468 | } | |
469 | ||
1da177e4 | 470 | #endif /* _SYSFS_H_ */ |