Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * class.c - basic device class management | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * Copyright (c) 2003-2004 Greg Kroah-Hartman | |
7 | * Copyright (c) 2003-2004 IBM Corp. | |
8 | * | |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/kdev_t.h> | |
e9ba6365 | 18 | #include <linux/err.h> |
4e57b681 | 19 | #include <linux/slab.h> |
1da177e4 LT |
20 | #include "base.h" |
21 | ||
c205ef48 GKH |
22 | extern struct subsystem devices_subsys; |
23 | ||
1da177e4 LT |
24 | #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) |
25 | #define to_class(obj) container_of(obj, struct class, subsys.kset.kobj) | |
26 | ||
27 | static ssize_t | |
28 | class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
29 | { | |
30 | struct class_attribute * class_attr = to_class_attr(attr); | |
31 | struct class * dc = to_class(kobj); | |
4a0c20bf | 32 | ssize_t ret = -EIO; |
1da177e4 LT |
33 | |
34 | if (class_attr->show) | |
35 | ret = class_attr->show(dc, buf); | |
36 | return ret; | |
37 | } | |
38 | ||
39 | static ssize_t | |
40 | class_attr_store(struct kobject * kobj, struct attribute * attr, | |
41 | const char * buf, size_t count) | |
42 | { | |
43 | struct class_attribute * class_attr = to_class_attr(attr); | |
44 | struct class * dc = to_class(kobj); | |
4a0c20bf | 45 | ssize_t ret = -EIO; |
1da177e4 LT |
46 | |
47 | if (class_attr->store) | |
48 | ret = class_attr->store(dc, buf, count); | |
49 | return ret; | |
50 | } | |
51 | ||
52 | static void class_release(struct kobject * kobj) | |
53 | { | |
54 | struct class *class = to_class(kobj); | |
55 | ||
56 | pr_debug("class '%s': release.\n", class->name); | |
57 | ||
58 | if (class->class_release) | |
59 | class->class_release(class); | |
60 | else | |
61 | pr_debug("class '%s' does not have a release() function, " | |
62 | "be careful\n", class->name); | |
63 | } | |
64 | ||
65 | static struct sysfs_ops class_sysfs_ops = { | |
66 | .show = class_attr_show, | |
67 | .store = class_attr_store, | |
68 | }; | |
69 | ||
70 | static struct kobj_type ktype_class = { | |
71 | .sysfs_ops = &class_sysfs_ops, | |
72 | .release = class_release, | |
73 | }; | |
74 | ||
75 | /* Hotplug events for classes go to the class_obj subsys */ | |
76 | static decl_subsys(class, &ktype_class, NULL); | |
77 | ||
78 | ||
79 | int class_create_file(struct class * cls, const struct class_attribute * attr) | |
80 | { | |
81 | int error; | |
82 | if (cls) { | |
83 | error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr); | |
84 | } else | |
85 | error = -EINVAL; | |
86 | return error; | |
87 | } | |
88 | ||
89 | void class_remove_file(struct class * cls, const struct class_attribute * attr) | |
90 | { | |
91 | if (cls) | |
92 | sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr); | |
93 | } | |
94 | ||
1740757e | 95 | static struct class *class_get(struct class *cls) |
1da177e4 LT |
96 | { |
97 | if (cls) | |
98 | return container_of(subsys_get(&cls->subsys), struct class, subsys); | |
99 | return NULL; | |
100 | } | |
101 | ||
1740757e | 102 | static void class_put(struct class * cls) |
1da177e4 | 103 | { |
51d172d5 GKH |
104 | if (cls) |
105 | subsys_put(&cls->subsys); | |
1da177e4 LT |
106 | } |
107 | ||
108 | ||
109 | static int add_class_attrs(struct class * cls) | |
110 | { | |
111 | int i; | |
112 | int error = 0; | |
113 | ||
114 | if (cls->class_attrs) { | |
115 | for (i = 0; attr_name(cls->class_attrs[i]); i++) { | |
116 | error = class_create_file(cls,&cls->class_attrs[i]); | |
117 | if (error) | |
118 | goto Err; | |
119 | } | |
120 | } | |
121 | Done: | |
122 | return error; | |
123 | Err: | |
124 | while (--i >= 0) | |
125 | class_remove_file(cls,&cls->class_attrs[i]); | |
126 | goto Done; | |
127 | } | |
128 | ||
129 | static void remove_class_attrs(struct class * cls) | |
130 | { | |
131 | int i; | |
132 | ||
133 | if (cls->class_attrs) { | |
134 | for (i = 0; attr_name(cls->class_attrs[i]); i++) | |
135 | class_remove_file(cls,&cls->class_attrs[i]); | |
136 | } | |
137 | } | |
138 | ||
139 | int class_register(struct class * cls) | |
140 | { | |
141 | int error; | |
142 | ||
143 | pr_debug("device class '%s': registering\n", cls->name); | |
144 | ||
145 | INIT_LIST_HEAD(&cls->children); | |
23681e47 | 146 | INIT_LIST_HEAD(&cls->devices); |
1da177e4 LT |
147 | INIT_LIST_HEAD(&cls->interfaces); |
148 | init_MUTEX(&cls->sem); | |
149 | error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name); | |
150 | if (error) | |
151 | return error; | |
152 | ||
153 | subsys_set_kset(cls, class_subsys); | |
154 | ||
155 | error = subsystem_register(&cls->subsys); | |
156 | if (!error) { | |
157 | error = add_class_attrs(class_get(cls)); | |
158 | class_put(cls); | |
159 | } | |
160 | return error; | |
161 | } | |
162 | ||
163 | void class_unregister(struct class * cls) | |
164 | { | |
165 | pr_debug("device class '%s': unregistering\n", cls->name); | |
166 | remove_class_attrs(cls); | |
167 | subsystem_unregister(&cls->subsys); | |
168 | } | |
169 | ||
e9ba6365 | 170 | static void class_create_release(struct class *cls) |
171 | { | |
51d172d5 | 172 | pr_debug("%s called for %s\n", __FUNCTION__, cls->name); |
e9ba6365 | 173 | kfree(cls); |
174 | } | |
175 | ||
176 | static void class_device_create_release(struct class_device *class_dev) | |
177 | { | |
51d172d5 | 178 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); |
e9ba6365 | 179 | kfree(class_dev); |
180 | } | |
181 | ||
51d172d5 | 182 | /* needed to allow these devices to have parent class devices */ |
312c004d | 183 | static int class_device_create_uevent(struct class_device *class_dev, |
51d172d5 GKH |
184 | char **envp, int num_envp, |
185 | char *buffer, int buffer_size) | |
186 | { | |
187 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); | |
188 | return 0; | |
189 | } | |
190 | ||
2fc68447 | 191 | /** |
192 | * class_create - create a struct class structure | |
193 | * @owner: pointer to the module that is to "own" this struct class | |
194 | * @name: pointer to a string for the name of this class. | |
195 | * | |
196 | * This is used to create a struct class pointer that can then be used | |
197 | * in calls to class_device_create(). | |
198 | * | |
199 | * Note, the pointer created here is to be destroyed when finished by | |
200 | * making a call to class_destroy(). | |
201 | */ | |
ab7d7371 | 202 | struct class *class_create(struct module *owner, const char *name) |
e9ba6365 | 203 | { |
204 | struct class *cls; | |
205 | int retval; | |
206 | ||
4aed0644 | 207 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
e9ba6365 | 208 | if (!cls) { |
209 | retval = -ENOMEM; | |
210 | goto error; | |
211 | } | |
e9ba6365 | 212 | |
213 | cls->name = name; | |
214 | cls->owner = owner; | |
215 | cls->class_release = class_create_release; | |
216 | cls->release = class_device_create_release; | |
217 | ||
218 | retval = class_register(cls); | |
219 | if (retval) | |
220 | goto error; | |
221 | ||
222 | return cls; | |
223 | ||
224 | error: | |
225 | kfree(cls); | |
226 | return ERR_PTR(retval); | |
227 | } | |
228 | ||
2fc68447 | 229 | /** |
230 | * class_destroy - destroys a struct class structure | |
92a0f861 | 231 | * @cls: pointer to the struct class that is to be destroyed |
2fc68447 | 232 | * |
233 | * Note, the pointer to be destroyed must have been created with a call | |
234 | * to class_create(). | |
235 | */ | |
e9ba6365 | 236 | void class_destroy(struct class *cls) |
237 | { | |
238 | if ((cls == NULL) || (IS_ERR(cls))) | |
239 | return; | |
240 | ||
241 | class_unregister(cls); | |
242 | } | |
1da177e4 LT |
243 | |
244 | /* Class Device Stuff */ | |
245 | ||
246 | int class_device_create_file(struct class_device * class_dev, | |
247 | const struct class_device_attribute * attr) | |
248 | { | |
249 | int error = -EINVAL; | |
250 | if (class_dev) | |
251 | error = sysfs_create_file(&class_dev->kobj, &attr->attr); | |
252 | return error; | |
253 | } | |
254 | ||
255 | void class_device_remove_file(struct class_device * class_dev, | |
256 | const struct class_device_attribute * attr) | |
257 | { | |
258 | if (class_dev) | |
259 | sysfs_remove_file(&class_dev->kobj, &attr->attr); | |
260 | } | |
261 | ||
262 | int class_device_create_bin_file(struct class_device *class_dev, | |
263 | struct bin_attribute *attr) | |
264 | { | |
265 | int error = -EINVAL; | |
266 | if (class_dev) | |
267 | error = sysfs_create_bin_file(&class_dev->kobj, attr); | |
268 | return error; | |
269 | } | |
270 | ||
271 | void class_device_remove_bin_file(struct class_device *class_dev, | |
272 | struct bin_attribute *attr) | |
273 | { | |
274 | if (class_dev) | |
275 | sysfs_remove_bin_file(&class_dev->kobj, attr); | |
276 | } | |
277 | ||
278 | static ssize_t | |
279 | class_device_attr_show(struct kobject * kobj, struct attribute * attr, | |
280 | char * buf) | |
281 | { | |
282 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
283 | struct class_device * cd = to_class_dev(kobj); | |
284 | ssize_t ret = 0; | |
285 | ||
286 | if (class_dev_attr->show) | |
287 | ret = class_dev_attr->show(cd, buf); | |
288 | return ret; | |
289 | } | |
290 | ||
291 | static ssize_t | |
292 | class_device_attr_store(struct kobject * kobj, struct attribute * attr, | |
293 | const char * buf, size_t count) | |
294 | { | |
295 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
296 | struct class_device * cd = to_class_dev(kobj); | |
297 | ssize_t ret = 0; | |
298 | ||
299 | if (class_dev_attr->store) | |
300 | ret = class_dev_attr->store(cd, buf, count); | |
301 | return ret; | |
302 | } | |
303 | ||
304 | static struct sysfs_ops class_dev_sysfs_ops = { | |
305 | .show = class_device_attr_show, | |
306 | .store = class_device_attr_store, | |
307 | }; | |
308 | ||
309 | static void class_dev_release(struct kobject * kobj) | |
310 | { | |
311 | struct class_device *cd = to_class_dev(kobj); | |
312 | struct class * cls = cd->class; | |
313 | ||
314 | pr_debug("device class '%s': release.\n", cd->class_id); | |
315 | ||
fef6ec8d JJ |
316 | kfree(cd->devt_attr); |
317 | cd->devt_attr = NULL; | |
208f3d61 | 318 | |
51d172d5 GKH |
319 | if (cd->release) |
320 | cd->release(cd); | |
321 | else if (cls->release) | |
1da177e4 LT |
322 | cls->release(cd); |
323 | else { | |
51d172d5 | 324 | printk(KERN_ERR "Class Device '%s' does not have a release() function, " |
1da177e4 LT |
325 | "it is broken and must be fixed.\n", |
326 | cd->class_id); | |
327 | WARN_ON(1); | |
328 | } | |
329 | } | |
330 | ||
331 | static struct kobj_type ktype_class_device = { | |
332 | .sysfs_ops = &class_dev_sysfs_ops, | |
333 | .release = class_dev_release, | |
334 | }; | |
335 | ||
312c004d | 336 | static int class_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
337 | { |
338 | struct kobj_type *ktype = get_ktype(kobj); | |
339 | ||
340 | if (ktype == &ktype_class_device) { | |
341 | struct class_device *class_dev = to_class_dev(kobj); | |
342 | if (class_dev->class) | |
343 | return 1; | |
344 | } | |
345 | return 0; | |
346 | } | |
347 | ||
312c004d | 348 | static const char *class_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
349 | { |
350 | struct class_device *class_dev = to_class_dev(kobj); | |
351 | ||
352 | return class_dev->class->name; | |
353 | } | |
354 | ||
805fab47 KS |
355 | #ifdef CONFIG_SYSFS_DEPRECATED |
356 | char *make_class_name(const char *name, struct kobject *kobj) | |
357 | { | |
358 | char *class_name; | |
359 | int size; | |
360 | ||
361 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; | |
362 | ||
363 | class_name = kmalloc(size, GFP_KERNEL); | |
364 | if (!class_name) | |
365 | return ERR_PTR(-ENOMEM); | |
366 | ||
367 | strcpy(class_name, name); | |
368 | strcat(class_name, ":"); | |
369 | strcat(class_name, kobject_name(kobj)); | |
370 | return class_name; | |
371 | } | |
372 | ||
373 | static int deprecated_class_uevent(char **envp, int num_envp, int *cur_index, | |
374 | char *buffer, int buffer_size, | |
375 | int *cur_len, | |
376 | struct class_device *class_dev) | |
377 | { | |
378 | struct device *dev = class_dev->dev; | |
379 | char *path; | |
380 | ||
381 | if (!dev) | |
382 | return 0; | |
383 | ||
384 | /* add device, backing this class device (deprecated) */ | |
385 | path = kobject_get_path(&dev->kobj, GFP_KERNEL); | |
386 | ||
387 | add_uevent_var(envp, num_envp, cur_index, buffer, buffer_size, | |
388 | cur_len, "PHYSDEVPATH=%s", path); | |
389 | kfree(path); | |
390 | ||
391 | if (dev->bus) | |
392 | add_uevent_var(envp, num_envp, cur_index, | |
393 | buffer, buffer_size, cur_len, | |
394 | "PHYSDEVBUS=%s", dev->bus->name); | |
395 | ||
396 | if (dev->driver) | |
397 | add_uevent_var(envp, num_envp, cur_index, | |
398 | buffer, buffer_size, cur_len, | |
399 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
400 | return 0; | |
401 | } | |
402 | ||
403 | static int make_deprecated_class_device_links(struct class_device *class_dev) | |
404 | { | |
405 | char *class_name; | |
406 | int error; | |
407 | ||
408 | if (!class_dev->dev) | |
409 | return 0; | |
410 | ||
411 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
412 | error = sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj, | |
413 | class_name); | |
414 | kfree(class_name); | |
415 | return error; | |
416 | } | |
417 | ||
418 | static void remove_deprecated_class_device_links(struct class_device *class_dev) | |
419 | { | |
420 | char *class_name; | |
421 | ||
422 | if (!class_dev->dev) | |
423 | return; | |
424 | ||
425 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
426 | sysfs_remove_link(&class_dev->dev->kobj, class_name); | |
427 | kfree(class_name); | |
428 | } | |
429 | #else | |
430 | static inline int deprecated_class_uevent(char **envp, int num_envp, | |
431 | int *cur_index, char *buffer, | |
432 | int buffer_size, int *cur_len, | |
433 | struct class_device *class_dev) | |
434 | { return 0; } | |
435 | static inline int make_deprecated_class_device_links(struct class_device *cd) | |
436 | { return 0; } | |
437 | static void remove_deprecated_class_device_links(struct class_device *cd) | |
438 | { } | |
439 | #endif | |
440 | ||
312c004d | 441 | static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
442 | int num_envp, char *buffer, int buffer_size) |
443 | { | |
444 | struct class_device *class_dev = to_class_dev(kobj); | |
445 | int i = 0; | |
446 | int length = 0; | |
447 | int retval = 0; | |
448 | ||
449 | pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); | |
450 | ||
805fab47 KS |
451 | deprecated_class_uevent(envp, num_envp, &i, buffer, buffer_size, |
452 | &length, class_dev); | |
1da177e4 LT |
453 | |
454 | if (MAJOR(class_dev->devt)) { | |
312c004d KS |
455 | add_uevent_var(envp, num_envp, &i, |
456 | buffer, buffer_size, &length, | |
457 | "MAJOR=%u", MAJOR(class_dev->devt)); | |
1da177e4 | 458 | |
312c004d KS |
459 | add_uevent_var(envp, num_envp, &i, |
460 | buffer, buffer_size, &length, | |
461 | "MINOR=%u", MINOR(class_dev->devt)); | |
1da177e4 LT |
462 | } |
463 | ||
464 | /* terminate, set to next free slot, shrink available space */ | |
465 | envp[i] = NULL; | |
466 | envp = &envp[i]; | |
467 | num_envp -= i; | |
468 | buffer = &buffer[length]; | |
469 | buffer_size -= length; | |
470 | ||
312c004d | 471 | if (class_dev->uevent) { |
51d172d5 | 472 | /* have the class device specific function add its stuff */ |
312c004d | 473 | retval = class_dev->uevent(class_dev, envp, num_envp, |
51d172d5 GKH |
474 | buffer, buffer_size); |
475 | if (retval) | |
312c004d KS |
476 | pr_debug("class_dev->uevent() returned %d\n", retval); |
477 | } else if (class_dev->class->uevent) { | |
51d172d5 | 478 | /* have the class specific function add its stuff */ |
312c004d | 479 | retval = class_dev->class->uevent(class_dev, envp, num_envp, |
51d172d5 GKH |
480 | buffer, buffer_size); |
481 | if (retval) | |
312c004d | 482 | pr_debug("class->uevent() returned %d\n", retval); |
1da177e4 LT |
483 | } |
484 | ||
485 | return retval; | |
486 | } | |
487 | ||
312c004d KS |
488 | static struct kset_uevent_ops class_uevent_ops = { |
489 | .filter = class_uevent_filter, | |
490 | .name = class_uevent_name, | |
491 | .uevent = class_uevent, | |
1da177e4 LT |
492 | }; |
493 | ||
312c004d | 494 | static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops); |
1da177e4 LT |
495 | |
496 | ||
497 | static int class_device_add_attrs(struct class_device * cd) | |
498 | { | |
499 | int i; | |
500 | int error = 0; | |
501 | struct class * cls = cd->class; | |
502 | ||
503 | if (cls->class_dev_attrs) { | |
504 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { | |
505 | error = class_device_create_file(cd, | |
506 | &cls->class_dev_attrs[i]); | |
507 | if (error) | |
508 | goto Err; | |
509 | } | |
510 | } | |
511 | Done: | |
512 | return error; | |
513 | Err: | |
514 | while (--i >= 0) | |
515 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
516 | goto Done; | |
517 | } | |
518 | ||
519 | static void class_device_remove_attrs(struct class_device * cd) | |
520 | { | |
521 | int i; | |
522 | struct class * cls = cd->class; | |
523 | ||
524 | if (cls->class_dev_attrs) { | |
525 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) | |
526 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
527 | } | |
528 | } | |
529 | ||
1498221d SH |
530 | static int class_device_add_groups(struct class_device * cd) |
531 | { | |
532 | int i; | |
533 | int error = 0; | |
534 | ||
535 | if (cd->groups) { | |
536 | for (i = 0; cd->groups[i]; i++) { | |
537 | error = sysfs_create_group(&cd->kobj, cd->groups[i]); | |
538 | if (error) { | |
539 | while (--i >= 0) | |
540 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
541 | goto out; | |
542 | } | |
543 | } | |
544 | } | |
545 | out: | |
546 | return error; | |
547 | } | |
548 | ||
549 | static void class_device_remove_groups(struct class_device * cd) | |
550 | { | |
551 | int i; | |
552 | if (cd->groups) { | |
553 | for (i = 0; cd->groups[i]; i++) { | |
554 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
555 | } | |
556 | } | |
557 | } | |
558 | ||
1da177e4 LT |
559 | static ssize_t show_dev(struct class_device *class_dev, char *buf) |
560 | { | |
561 | return print_dev_t(buf, class_dev->devt); | |
562 | } | |
1da177e4 | 563 | |
a7fd6706 KS |
564 | static ssize_t store_uevent(struct class_device *class_dev, |
565 | const char *buf, size_t count) | |
566 | { | |
312c004d | 567 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
568 | return count; |
569 | } | |
570 | ||
1da177e4 LT |
571 | void class_device_initialize(struct class_device *class_dev) |
572 | { | |
573 | kobj_set_kset_s(class_dev, class_obj_subsys); | |
574 | kobject_init(&class_dev->kobj); | |
575 | INIT_LIST_HEAD(&class_dev->node); | |
576 | } | |
577 | ||
578 | int class_device_add(struct class_device *class_dev) | |
579 | { | |
51d172d5 GKH |
580 | struct class *parent_class = NULL; |
581 | struct class_device *parent_class_dev = NULL; | |
582 | struct class_interface *class_intf; | |
51d172d5 | 583 | int error = -EINVAL; |
1da177e4 LT |
584 | |
585 | class_dev = class_device_get(class_dev); | |
586 | if (!class_dev) | |
587 | return -EINVAL; | |
588 | ||
51d172d5 | 589 | if (!strlen(class_dev->class_id)) |
b7fe4a60 | 590 | goto out1; |
1da177e4 | 591 | |
51d172d5 GKH |
592 | parent_class = class_get(class_dev->class); |
593 | if (!parent_class) | |
b7fe4a60 SH |
594 | goto out1; |
595 | ||
51d172d5 | 596 | parent_class_dev = class_device_get(class_dev->parent); |
1da177e4 LT |
597 | |
598 | pr_debug("CLASS: registering class device: ID = '%s'\n", | |
599 | class_dev->class_id); | |
600 | ||
601 | /* first, register with generic layer. */ | |
b7fe4a60 SH |
602 | error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id); |
603 | if (error) | |
604 | goto out2; | |
605 | ||
51d172d5 GKH |
606 | if (parent_class_dev) |
607 | class_dev->kobj.parent = &parent_class_dev->kobj; | |
608 | else | |
609 | class_dev->kobj.parent = &parent_class->subsys.kset.kobj; | |
1da177e4 | 610 | |
51d172d5 GKH |
611 | error = kobject_add(&class_dev->kobj); |
612 | if (error) | |
b7fe4a60 | 613 | goto out2; |
1da177e4 | 614 | |
e9ba6365 | 615 | /* add the needed attributes to this device */ |
f0e1761a CH |
616 | error = sysfs_create_link(&class_dev->kobj, |
617 | &parent_class->subsys.kset.kobj, "subsystem"); | |
618 | if (error) | |
619 | goto out3; | |
a7fd6706 KS |
620 | class_dev->uevent_attr.attr.name = "uevent"; |
621 | class_dev->uevent_attr.attr.mode = S_IWUSR; | |
51d172d5 | 622 | class_dev->uevent_attr.attr.owner = parent_class->owner; |
a7fd6706 | 623 | class_dev->uevent_attr.store = store_uevent; |
b7fe4a60 SH |
624 | error = class_device_create_file(class_dev, &class_dev->uevent_attr); |
625 | if (error) | |
626 | goto out3; | |
a7fd6706 | 627 | |
e9ba6365 | 628 | if (MAJOR(class_dev->devt)) { |
629 | struct class_device_attribute *attr; | |
4aed0644 | 630 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
e9ba6365 | 631 | if (!attr) { |
632 | error = -ENOMEM; | |
b7fe4a60 | 633 | goto out4; |
e9ba6365 | 634 | } |
e9ba6365 | 635 | attr->attr.name = "dev"; |
636 | attr->attr.mode = S_IRUGO; | |
51d172d5 | 637 | attr->attr.owner = parent_class->owner; |
e9ba6365 | 638 | attr->show = show_dev; |
b7fe4a60 SH |
639 | error = class_device_create_file(class_dev, attr); |
640 | if (error) { | |
641 | kfree(attr); | |
642 | goto out4; | |
643 | } | |
644 | ||
e9ba6365 | 645 | class_dev->devt_attr = attr; |
646 | } | |
647 | ||
b7fe4a60 SH |
648 | error = class_device_add_attrs(class_dev); |
649 | if (error) | |
650 | goto out5; | |
651 | ||
76d1ce00 | 652 | if (class_dev->dev) { |
b7fe4a60 SH |
653 | error = sysfs_create_link(&class_dev->kobj, |
654 | &class_dev->dev->kobj, "device"); | |
655 | if (error) | |
656 | goto out6; | |
76d1ce00 | 657 | } |
e9ba6365 | 658 | |
b7fe4a60 | 659 | error = class_device_add_groups(class_dev); |
805fab47 KS |
660 | if (error) |
661 | goto out7; | |
662 | ||
663 | error = make_deprecated_class_device_links(class_dev); | |
b7fe4a60 SH |
664 | if (error) |
665 | goto out8; | |
1498221d | 666 | |
312c004d | 667 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
dbe9035d | 668 | |
e9ba6365 | 669 | /* notify any interfaces this device is now here */ |
a1438890 J |
670 | down(&parent_class->sem); |
671 | list_add_tail(&class_dev->node, &parent_class->children); | |
672 | list_for_each_entry(class_intf, &parent_class->interfaces, node) { | |
673 | if (class_intf->add) | |
674 | class_intf->add(class_dev, class_intf); | |
1da177e4 | 675 | } |
a1438890 | 676 | up(&parent_class->sem); |
e9ba6365 | 677 | |
b7fe4a60 SH |
678 | goto out1; |
679 | ||
680 | out8: | |
805fab47 | 681 | class_device_remove_groups(class_dev); |
b7fe4a60 SH |
682 | out7: |
683 | if (class_dev->dev) | |
684 | sysfs_remove_link(&class_dev->kobj, "device"); | |
685 | out6: | |
686 | class_device_remove_attrs(class_dev); | |
687 | out5: | |
688 | if (class_dev->devt_attr) | |
689 | class_device_remove_file(class_dev, class_dev->devt_attr); | |
690 | out4: | |
691 | class_device_remove_file(class_dev, &class_dev->uevent_attr); | |
692 | out3: | |
693 | kobject_del(&class_dev->kobj); | |
694 | out2: | |
695 | if(parent_class_dev) | |
51d172d5 | 696 | class_device_put(parent_class_dev); |
b7fe4a60 SH |
697 | class_put(parent_class); |
698 | out1: | |
1da177e4 LT |
699 | class_device_put(class_dev); |
700 | return error; | |
701 | } | |
702 | ||
703 | int class_device_register(struct class_device *class_dev) | |
704 | { | |
705 | class_device_initialize(class_dev); | |
706 | return class_device_add(class_dev); | |
707 | } | |
708 | ||
2fc68447 | 709 | /** |
710 | * class_device_create - creates a class device and registers it with sysfs | |
92a0f861 | 711 | * @cls: pointer to the struct class that this device should be registered to. |
51d172d5 | 712 | * @parent: pointer to the parent struct class_device of this new device, if any. |
92a0f861 | 713 | * @devt: the dev_t for the char device to be added. |
2fc68447 | 714 | * @device: a pointer to a struct device that is assiociated with this class device. |
715 | * @fmt: string for the class device's name | |
716 | * | |
717 | * This function can be used by char device classes. A struct | |
718 | * class_device will be created in sysfs, registered to the specified | |
51d172d5 GKH |
719 | * class. |
720 | * A "dev" file will be created, showing the dev_t for the device, if | |
721 | * the dev_t is not 0,0. | |
722 | * If a pointer to a parent struct class_device is passed in, the newly | |
723 | * created struct class_device will be a child of that device in sysfs. | |
724 | * The pointer to the struct class_device will be returned from the | |
725 | * call. Any further sysfs files that might be required can be created | |
726 | * using this pointer. | |
2fc68447 | 727 | * |
728 | * Note: the struct class passed to this function must have previously | |
729 | * been created with a call to class_create(). | |
730 | */ | |
51d172d5 GKH |
731 | struct class_device *class_device_create(struct class *cls, |
732 | struct class_device *parent, | |
733 | dev_t devt, | |
ddd5d35a DT |
734 | struct device *device, |
735 | const char *fmt, ...) | |
e9ba6365 | 736 | { |
737 | va_list args; | |
738 | struct class_device *class_dev = NULL; | |
739 | int retval = -ENODEV; | |
740 | ||
741 | if (cls == NULL || IS_ERR(cls)) | |
742 | goto error; | |
743 | ||
4aed0644 | 744 | class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL); |
e9ba6365 | 745 | if (!class_dev) { |
746 | retval = -ENOMEM; | |
747 | goto error; | |
748 | } | |
e9ba6365 | 749 | |
750 | class_dev->devt = devt; | |
751 | class_dev->dev = device; | |
752 | class_dev->class = cls; | |
51d172d5 GKH |
753 | class_dev->parent = parent; |
754 | class_dev->release = class_device_create_release; | |
312c004d | 755 | class_dev->uevent = class_device_create_uevent; |
e9ba6365 | 756 | |
757 | va_start(args, fmt); | |
758 | vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args); | |
759 | va_end(args); | |
760 | retval = class_device_register(class_dev); | |
761 | if (retval) | |
762 | goto error; | |
763 | ||
764 | return class_dev; | |
765 | ||
766 | error: | |
767 | kfree(class_dev); | |
768 | return ERR_PTR(retval); | |
769 | } | |
770 | ||
1da177e4 LT |
771 | void class_device_del(struct class_device *class_dev) |
772 | { | |
51d172d5 GKH |
773 | struct class *parent_class = class_dev->class; |
774 | struct class_device *parent_device = class_dev->parent; | |
775 | struct class_interface *class_intf; | |
1da177e4 | 776 | |
51d172d5 GKH |
777 | if (parent_class) { |
778 | down(&parent_class->sem); | |
1da177e4 | 779 | list_del_init(&class_dev->node); |
51d172d5 | 780 | list_for_each_entry(class_intf, &parent_class->interfaces, node) |
1da177e4 | 781 | if (class_intf->remove) |
d8539d81 | 782 | class_intf->remove(class_dev, class_intf); |
51d172d5 | 783 | up(&parent_class->sem); |
1da177e4 LT |
784 | } |
785 | ||
76d1ce00 | 786 | if (class_dev->dev) { |
805fab47 | 787 | remove_deprecated_class_device_links(class_dev); |
1da177e4 | 788 | sysfs_remove_link(&class_dev->kobj, "device"); |
76d1ce00 | 789 | } |
b9d9c82b | 790 | sysfs_remove_link(&class_dev->kobj, "subsystem"); |
a7fd6706 | 791 | class_device_remove_file(class_dev, &class_dev->uevent_attr); |
208f3d61 | 792 | if (class_dev->devt_attr) |
e9ba6365 | 793 | class_device_remove_file(class_dev, class_dev->devt_attr); |
1da177e4 | 794 | class_device_remove_attrs(class_dev); |
1498221d | 795 | class_device_remove_groups(class_dev); |
1da177e4 | 796 | |
312c004d | 797 | kobject_uevent(&class_dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
798 | kobject_del(&class_dev->kobj); |
799 | ||
51d172d5 GKH |
800 | class_device_put(parent_device); |
801 | class_put(parent_class); | |
1da177e4 LT |
802 | } |
803 | ||
804 | void class_device_unregister(struct class_device *class_dev) | |
805 | { | |
806 | pr_debug("CLASS: Unregistering class device. ID = '%s'\n", | |
807 | class_dev->class_id); | |
808 | class_device_del(class_dev); | |
809 | class_device_put(class_dev); | |
810 | } | |
811 | ||
2fc68447 | 812 | /** |
813 | * class_device_destroy - removes a class device that was created with class_device_create() | |
814 | * @cls: the pointer to the struct class that this device was registered * with. | |
92a0f861 | 815 | * @devt: the dev_t of the device that was previously registered. |
2fc68447 | 816 | * |
817 | * This call unregisters and cleans up a class device that was created with a | |
818 | * call to class_device_create() | |
819 | */ | |
e9ba6365 | 820 | void class_device_destroy(struct class *cls, dev_t devt) |
821 | { | |
822 | struct class_device *class_dev = NULL; | |
823 | struct class_device *class_dev_tmp; | |
824 | ||
825 | down(&cls->sem); | |
826 | list_for_each_entry(class_dev_tmp, &cls->children, node) { | |
827 | if (class_dev_tmp->devt == devt) { | |
828 | class_dev = class_dev_tmp; | |
829 | break; | |
830 | } | |
831 | } | |
832 | up(&cls->sem); | |
833 | ||
834 | if (class_dev) | |
835 | class_device_unregister(class_dev); | |
836 | } | |
837 | ||
1da177e4 LT |
838 | int class_device_rename(struct class_device *class_dev, char *new_name) |
839 | { | |
840 | int error = 0; | |
3e51377d | 841 | char *old_class_name = NULL, *new_class_name = NULL; |
1da177e4 LT |
842 | |
843 | class_dev = class_device_get(class_dev); | |
844 | if (!class_dev) | |
845 | return -EINVAL; | |
846 | ||
847 | pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id, | |
848 | new_name); | |
849 | ||
805fab47 | 850 | #ifdef CONFIG_SYSFS_DEPRECATED |
3e51377d | 851 | if (class_dev->dev) |
aa49b913 GKH |
852 | old_class_name = make_class_name(class_dev->class->name, |
853 | &class_dev->kobj); | |
805fab47 | 854 | #endif |
3e51377d | 855 | |
1da177e4 LT |
856 | strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN); |
857 | ||
858 | error = kobject_rename(&class_dev->kobj, new_name); | |
859 | ||
805fab47 | 860 | #ifdef CONFIG_SYSFS_DEPRECATED |
3e51377d | 861 | if (class_dev->dev) { |
aa49b913 GKH |
862 | new_class_name = make_class_name(class_dev->class->name, |
863 | &class_dev->kobj); | |
3e51377d BN |
864 | sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj, |
865 | new_class_name); | |
866 | sysfs_remove_link(&class_dev->dev->kobj, old_class_name); | |
867 | } | |
805fab47 | 868 | #endif |
1da177e4 LT |
869 | class_device_put(class_dev); |
870 | ||
3e51377d BN |
871 | kfree(old_class_name); |
872 | kfree(new_class_name); | |
873 | ||
1da177e4 LT |
874 | return error; |
875 | } | |
876 | ||
877 | struct class_device * class_device_get(struct class_device *class_dev) | |
878 | { | |
879 | if (class_dev) | |
880 | return to_class_dev(kobject_get(&class_dev->kobj)); | |
881 | return NULL; | |
882 | } | |
883 | ||
884 | void class_device_put(struct class_device *class_dev) | |
885 | { | |
51d172d5 GKH |
886 | if (class_dev) |
887 | kobject_put(&class_dev->kobj); | |
1da177e4 LT |
888 | } |
889 | ||
890 | ||
891 | int class_interface_register(struct class_interface *class_intf) | |
892 | { | |
893 | struct class *parent; | |
894 | struct class_device *class_dev; | |
c47ed219 | 895 | struct device *dev; |
1da177e4 LT |
896 | |
897 | if (!class_intf || !class_intf->class) | |
898 | return -ENODEV; | |
899 | ||
900 | parent = class_get(class_intf->class); | |
901 | if (!parent) | |
902 | return -EINVAL; | |
903 | ||
904 | down(&parent->sem); | |
905 | list_add_tail(&class_intf->node, &parent->interfaces); | |
906 | if (class_intf->add) { | |
907 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 908 | class_intf->add(class_dev, class_intf); |
1da177e4 | 909 | } |
c47ed219 GKH |
910 | if (class_intf->add_dev) { |
911 | list_for_each_entry(dev, &parent->devices, node) | |
912 | class_intf->add_dev(dev, class_intf); | |
913 | } | |
1da177e4 LT |
914 | up(&parent->sem); |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | void class_interface_unregister(struct class_interface *class_intf) | |
920 | { | |
921 | struct class * parent = class_intf->class; | |
922 | struct class_device *class_dev; | |
c47ed219 | 923 | struct device *dev; |
1da177e4 LT |
924 | |
925 | if (!parent) | |
926 | return; | |
927 | ||
928 | down(&parent->sem); | |
929 | list_del_init(&class_intf->node); | |
930 | if (class_intf->remove) { | |
931 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 932 | class_intf->remove(class_dev, class_intf); |
1da177e4 | 933 | } |
c47ed219 GKH |
934 | if (class_intf->remove_dev) { |
935 | list_for_each_entry(dev, &parent->devices, node) | |
936 | class_intf->remove_dev(dev, class_intf); | |
937 | } | |
1da177e4 LT |
938 | up(&parent->sem); |
939 | ||
940 | class_put(parent); | |
941 | } | |
942 | ||
1da177e4 LT |
943 | int __init classes_init(void) |
944 | { | |
945 | int retval; | |
946 | ||
947 | retval = subsystem_register(&class_subsys); | |
948 | if (retval) | |
949 | return retval; | |
950 | ||
951 | /* ick, this is ugly, the things we go through to keep from showing up | |
952 | * in sysfs... */ | |
953 | subsystem_init(&class_obj_subsys); | |
954 | if (!class_obj_subsys.kset.subsys) | |
955 | class_obj_subsys.kset.subsys = &class_obj_subsys; | |
956 | return 0; | |
957 | } | |
958 | ||
959 | EXPORT_SYMBOL_GPL(class_create_file); | |
960 | EXPORT_SYMBOL_GPL(class_remove_file); | |
961 | EXPORT_SYMBOL_GPL(class_register); | |
962 | EXPORT_SYMBOL_GPL(class_unregister); | |
e9ba6365 | 963 | EXPORT_SYMBOL_GPL(class_create); |
964 | EXPORT_SYMBOL_GPL(class_destroy); | |
1da177e4 LT |
965 | |
966 | EXPORT_SYMBOL_GPL(class_device_register); | |
967 | EXPORT_SYMBOL_GPL(class_device_unregister); | |
968 | EXPORT_SYMBOL_GPL(class_device_initialize); | |
969 | EXPORT_SYMBOL_GPL(class_device_add); | |
970 | EXPORT_SYMBOL_GPL(class_device_del); | |
971 | EXPORT_SYMBOL_GPL(class_device_get); | |
972 | EXPORT_SYMBOL_GPL(class_device_put); | |
e9ba6365 | 973 | EXPORT_SYMBOL_GPL(class_device_create); |
974 | EXPORT_SYMBOL_GPL(class_device_destroy); | |
1da177e4 LT |
975 | EXPORT_SYMBOL_GPL(class_device_create_file); |
976 | EXPORT_SYMBOL_GPL(class_device_remove_file); | |
977 | EXPORT_SYMBOL_GPL(class_device_create_bin_file); | |
978 | EXPORT_SYMBOL_GPL(class_device_remove_bin_file); | |
979 | ||
980 | EXPORT_SYMBOL_GPL(class_interface_register); | |
981 | EXPORT_SYMBOL_GPL(class_interface_unregister); |