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); | |
b92be9f1 | 166 | kobject_unregister(cls->virtual_dir); |
1da177e4 LT |
167 | remove_class_attrs(cls); |
168 | subsystem_unregister(&cls->subsys); | |
169 | } | |
170 | ||
e9ba6365 | 171 | static void class_create_release(struct class *cls) |
172 | { | |
51d172d5 | 173 | pr_debug("%s called for %s\n", __FUNCTION__, cls->name); |
e9ba6365 | 174 | kfree(cls); |
175 | } | |
176 | ||
177 | static void class_device_create_release(struct class_device *class_dev) | |
178 | { | |
51d172d5 | 179 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); |
e9ba6365 | 180 | kfree(class_dev); |
181 | } | |
182 | ||
51d172d5 | 183 | /* needed to allow these devices to have parent class devices */ |
312c004d | 184 | static int class_device_create_uevent(struct class_device *class_dev, |
51d172d5 GKH |
185 | char **envp, int num_envp, |
186 | char *buffer, int buffer_size) | |
187 | { | |
188 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); | |
189 | return 0; | |
190 | } | |
191 | ||
2fc68447 | 192 | /** |
193 | * class_create - create a struct class structure | |
194 | * @owner: pointer to the module that is to "own" this struct class | |
195 | * @name: pointer to a string for the name of this class. | |
196 | * | |
197 | * This is used to create a struct class pointer that can then be used | |
198 | * in calls to class_device_create(). | |
199 | * | |
200 | * Note, the pointer created here is to be destroyed when finished by | |
201 | * making a call to class_destroy(). | |
202 | */ | |
ab7d7371 | 203 | struct class *class_create(struct module *owner, const char *name) |
e9ba6365 | 204 | { |
205 | struct class *cls; | |
206 | int retval; | |
207 | ||
4aed0644 | 208 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
e9ba6365 | 209 | if (!cls) { |
210 | retval = -ENOMEM; | |
211 | goto error; | |
212 | } | |
e9ba6365 | 213 | |
214 | cls->name = name; | |
215 | cls->owner = owner; | |
216 | cls->class_release = class_create_release; | |
217 | cls->release = class_device_create_release; | |
218 | ||
219 | retval = class_register(cls); | |
220 | if (retval) | |
221 | goto error; | |
222 | ||
223 | return cls; | |
224 | ||
225 | error: | |
226 | kfree(cls); | |
227 | return ERR_PTR(retval); | |
228 | } | |
229 | ||
2fc68447 | 230 | /** |
231 | * class_destroy - destroys a struct class structure | |
92a0f861 | 232 | * @cls: pointer to the struct class that is to be destroyed |
2fc68447 | 233 | * |
234 | * Note, the pointer to be destroyed must have been created with a call | |
235 | * to class_create(). | |
236 | */ | |
e9ba6365 | 237 | void class_destroy(struct class *cls) |
238 | { | |
239 | if ((cls == NULL) || (IS_ERR(cls))) | |
240 | return; | |
241 | ||
242 | class_unregister(cls); | |
243 | } | |
1da177e4 LT |
244 | |
245 | /* Class Device Stuff */ | |
246 | ||
247 | int class_device_create_file(struct class_device * class_dev, | |
248 | const struct class_device_attribute * attr) | |
249 | { | |
250 | int error = -EINVAL; | |
251 | if (class_dev) | |
252 | error = sysfs_create_file(&class_dev->kobj, &attr->attr); | |
253 | return error; | |
254 | } | |
255 | ||
256 | void class_device_remove_file(struct class_device * class_dev, | |
257 | const struct class_device_attribute * attr) | |
258 | { | |
259 | if (class_dev) | |
260 | sysfs_remove_file(&class_dev->kobj, &attr->attr); | |
261 | } | |
262 | ||
263 | int class_device_create_bin_file(struct class_device *class_dev, | |
264 | struct bin_attribute *attr) | |
265 | { | |
266 | int error = -EINVAL; | |
267 | if (class_dev) | |
268 | error = sysfs_create_bin_file(&class_dev->kobj, attr); | |
269 | return error; | |
270 | } | |
271 | ||
272 | void class_device_remove_bin_file(struct class_device *class_dev, | |
273 | struct bin_attribute *attr) | |
274 | { | |
275 | if (class_dev) | |
276 | sysfs_remove_bin_file(&class_dev->kobj, attr); | |
277 | } | |
278 | ||
279 | static ssize_t | |
280 | class_device_attr_show(struct kobject * kobj, struct attribute * attr, | |
281 | char * buf) | |
282 | { | |
283 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
284 | struct class_device * cd = to_class_dev(kobj); | |
285 | ssize_t ret = 0; | |
286 | ||
287 | if (class_dev_attr->show) | |
288 | ret = class_dev_attr->show(cd, buf); | |
289 | return ret; | |
290 | } | |
291 | ||
292 | static ssize_t | |
293 | class_device_attr_store(struct kobject * kobj, struct attribute * attr, | |
294 | const char * buf, size_t count) | |
295 | { | |
296 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
297 | struct class_device * cd = to_class_dev(kobj); | |
298 | ssize_t ret = 0; | |
299 | ||
300 | if (class_dev_attr->store) | |
301 | ret = class_dev_attr->store(cd, buf, count); | |
302 | return ret; | |
303 | } | |
304 | ||
305 | static struct sysfs_ops class_dev_sysfs_ops = { | |
306 | .show = class_device_attr_show, | |
307 | .store = class_device_attr_store, | |
308 | }; | |
309 | ||
310 | static void class_dev_release(struct kobject * kobj) | |
311 | { | |
312 | struct class_device *cd = to_class_dev(kobj); | |
313 | struct class * cls = cd->class; | |
314 | ||
315 | pr_debug("device class '%s': release.\n", cd->class_id); | |
316 | ||
fef6ec8d JJ |
317 | kfree(cd->devt_attr); |
318 | cd->devt_attr = NULL; | |
208f3d61 | 319 | |
51d172d5 GKH |
320 | if (cd->release) |
321 | cd->release(cd); | |
322 | else if (cls->release) | |
1da177e4 LT |
323 | cls->release(cd); |
324 | else { | |
51d172d5 | 325 | printk(KERN_ERR "Class Device '%s' does not have a release() function, " |
1da177e4 LT |
326 | "it is broken and must be fixed.\n", |
327 | cd->class_id); | |
328 | WARN_ON(1); | |
329 | } | |
330 | } | |
331 | ||
332 | static struct kobj_type ktype_class_device = { | |
333 | .sysfs_ops = &class_dev_sysfs_ops, | |
334 | .release = class_dev_release, | |
335 | }; | |
336 | ||
312c004d | 337 | static int class_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
338 | { |
339 | struct kobj_type *ktype = get_ktype(kobj); | |
340 | ||
341 | if (ktype == &ktype_class_device) { | |
342 | struct class_device *class_dev = to_class_dev(kobj); | |
343 | if (class_dev->class) | |
344 | return 1; | |
345 | } | |
346 | return 0; | |
347 | } | |
348 | ||
312c004d | 349 | static const char *class_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
350 | { |
351 | struct class_device *class_dev = to_class_dev(kobj); | |
352 | ||
353 | return class_dev->class->name; | |
354 | } | |
355 | ||
805fab47 KS |
356 | #ifdef CONFIG_SYSFS_DEPRECATED |
357 | char *make_class_name(const char *name, struct kobject *kobj) | |
358 | { | |
359 | char *class_name; | |
360 | int size; | |
361 | ||
362 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; | |
363 | ||
364 | class_name = kmalloc(size, GFP_KERNEL); | |
365 | if (!class_name) | |
cb360bbf | 366 | return NULL; |
805fab47 KS |
367 | |
368 | strcpy(class_name, name); | |
369 | strcat(class_name, ":"); | |
370 | strcat(class_name, kobject_name(kobj)); | |
371 | return class_name; | |
372 | } | |
373 | ||
374 | static int deprecated_class_uevent(char **envp, int num_envp, int *cur_index, | |
375 | char *buffer, int buffer_size, | |
376 | int *cur_len, | |
377 | struct class_device *class_dev) | |
378 | { | |
379 | struct device *dev = class_dev->dev; | |
380 | char *path; | |
381 | ||
382 | if (!dev) | |
383 | return 0; | |
384 | ||
385 | /* add device, backing this class device (deprecated) */ | |
386 | path = kobject_get_path(&dev->kobj, GFP_KERNEL); | |
387 | ||
388 | add_uevent_var(envp, num_envp, cur_index, buffer, buffer_size, | |
389 | cur_len, "PHYSDEVPATH=%s", path); | |
390 | kfree(path); | |
391 | ||
392 | if (dev->bus) | |
393 | add_uevent_var(envp, num_envp, cur_index, | |
394 | buffer, buffer_size, cur_len, | |
395 | "PHYSDEVBUS=%s", dev->bus->name); | |
396 | ||
397 | if (dev->driver) | |
398 | add_uevent_var(envp, num_envp, cur_index, | |
399 | buffer, buffer_size, cur_len, | |
400 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
401 | return 0; | |
402 | } | |
403 | ||
404 | static int make_deprecated_class_device_links(struct class_device *class_dev) | |
405 | { | |
406 | char *class_name; | |
407 | int error; | |
408 | ||
409 | if (!class_dev->dev) | |
410 | return 0; | |
411 | ||
412 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
413 | if (class_name) |
414 | error = sysfs_create_link(&class_dev->dev->kobj, | |
415 | &class_dev->kobj, class_name); | |
416 | else | |
417 | error = -ENOMEM; | |
805fab47 KS |
418 | kfree(class_name); |
419 | return error; | |
420 | } | |
421 | ||
422 | static void remove_deprecated_class_device_links(struct class_device *class_dev) | |
423 | { | |
424 | char *class_name; | |
425 | ||
426 | if (!class_dev->dev) | |
427 | return; | |
428 | ||
429 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
430 | if (class_name) |
431 | sysfs_remove_link(&class_dev->dev->kobj, class_name); | |
805fab47 KS |
432 | kfree(class_name); |
433 | } | |
434 | #else | |
435 | static inline int deprecated_class_uevent(char **envp, int num_envp, | |
436 | int *cur_index, char *buffer, | |
437 | int buffer_size, int *cur_len, | |
438 | struct class_device *class_dev) | |
439 | { return 0; } | |
440 | static inline int make_deprecated_class_device_links(struct class_device *cd) | |
441 | { return 0; } | |
442 | static void remove_deprecated_class_device_links(struct class_device *cd) | |
443 | { } | |
444 | #endif | |
445 | ||
312c004d | 446 | static int class_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
447 | int num_envp, char *buffer, int buffer_size) |
448 | { | |
449 | struct class_device *class_dev = to_class_dev(kobj); | |
450 | int i = 0; | |
451 | int length = 0; | |
452 | int retval = 0; | |
453 | ||
454 | pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); | |
455 | ||
805fab47 KS |
456 | deprecated_class_uevent(envp, num_envp, &i, buffer, buffer_size, |
457 | &length, class_dev); | |
1da177e4 LT |
458 | |
459 | if (MAJOR(class_dev->devt)) { | |
312c004d KS |
460 | add_uevent_var(envp, num_envp, &i, |
461 | buffer, buffer_size, &length, | |
462 | "MAJOR=%u", MAJOR(class_dev->devt)); | |
1da177e4 | 463 | |
312c004d KS |
464 | add_uevent_var(envp, num_envp, &i, |
465 | buffer, buffer_size, &length, | |
466 | "MINOR=%u", MINOR(class_dev->devt)); | |
1da177e4 LT |
467 | } |
468 | ||
469 | /* terminate, set to next free slot, shrink available space */ | |
470 | envp[i] = NULL; | |
471 | envp = &envp[i]; | |
472 | num_envp -= i; | |
473 | buffer = &buffer[length]; | |
474 | buffer_size -= length; | |
475 | ||
312c004d | 476 | if (class_dev->uevent) { |
51d172d5 | 477 | /* have the class device specific function add its stuff */ |
312c004d | 478 | retval = class_dev->uevent(class_dev, envp, num_envp, |
51d172d5 GKH |
479 | buffer, buffer_size); |
480 | if (retval) | |
312c004d KS |
481 | pr_debug("class_dev->uevent() returned %d\n", retval); |
482 | } else if (class_dev->class->uevent) { | |
51d172d5 | 483 | /* have the class specific function add its stuff */ |
312c004d | 484 | retval = class_dev->class->uevent(class_dev, envp, num_envp, |
51d172d5 GKH |
485 | buffer, buffer_size); |
486 | if (retval) | |
312c004d | 487 | pr_debug("class->uevent() returned %d\n", retval); |
1da177e4 LT |
488 | } |
489 | ||
490 | return retval; | |
491 | } | |
492 | ||
312c004d KS |
493 | static struct kset_uevent_ops class_uevent_ops = { |
494 | .filter = class_uevent_filter, | |
495 | .name = class_uevent_name, | |
496 | .uevent = class_uevent, | |
1da177e4 LT |
497 | }; |
498 | ||
312c004d | 499 | static decl_subsys(class_obj, &ktype_class_device, &class_uevent_ops); |
1da177e4 LT |
500 | |
501 | ||
502 | static int class_device_add_attrs(struct class_device * cd) | |
503 | { | |
504 | int i; | |
505 | int error = 0; | |
506 | struct class * cls = cd->class; | |
507 | ||
508 | if (cls->class_dev_attrs) { | |
509 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { | |
510 | error = class_device_create_file(cd, | |
511 | &cls->class_dev_attrs[i]); | |
512 | if (error) | |
513 | goto Err; | |
514 | } | |
515 | } | |
516 | Done: | |
517 | return error; | |
518 | Err: | |
519 | while (--i >= 0) | |
520 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
521 | goto Done; | |
522 | } | |
523 | ||
524 | static void class_device_remove_attrs(struct class_device * cd) | |
525 | { | |
526 | int i; | |
527 | struct class * cls = cd->class; | |
528 | ||
529 | if (cls->class_dev_attrs) { | |
530 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) | |
531 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
532 | } | |
533 | } | |
534 | ||
1498221d SH |
535 | static int class_device_add_groups(struct class_device * cd) |
536 | { | |
537 | int i; | |
538 | int error = 0; | |
539 | ||
540 | if (cd->groups) { | |
541 | for (i = 0; cd->groups[i]; i++) { | |
542 | error = sysfs_create_group(&cd->kobj, cd->groups[i]); | |
543 | if (error) { | |
544 | while (--i >= 0) | |
545 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
546 | goto out; | |
547 | } | |
548 | } | |
549 | } | |
550 | out: | |
551 | return error; | |
552 | } | |
553 | ||
554 | static void class_device_remove_groups(struct class_device * cd) | |
555 | { | |
556 | int i; | |
557 | if (cd->groups) { | |
558 | for (i = 0; cd->groups[i]; i++) { | |
559 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
560 | } | |
561 | } | |
562 | } | |
563 | ||
1da177e4 LT |
564 | static ssize_t show_dev(struct class_device *class_dev, char *buf) |
565 | { | |
566 | return print_dev_t(buf, class_dev->devt); | |
567 | } | |
1da177e4 | 568 | |
a7fd6706 KS |
569 | static ssize_t store_uevent(struct class_device *class_dev, |
570 | const char *buf, size_t count) | |
571 | { | |
312c004d | 572 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
573 | return count; |
574 | } | |
575 | ||
1da177e4 LT |
576 | void class_device_initialize(struct class_device *class_dev) |
577 | { | |
578 | kobj_set_kset_s(class_dev, class_obj_subsys); | |
579 | kobject_init(&class_dev->kobj); | |
580 | INIT_LIST_HEAD(&class_dev->node); | |
581 | } | |
582 | ||
583 | int class_device_add(struct class_device *class_dev) | |
584 | { | |
51d172d5 GKH |
585 | struct class *parent_class = NULL; |
586 | struct class_device *parent_class_dev = NULL; | |
587 | struct class_interface *class_intf; | |
51d172d5 | 588 | int error = -EINVAL; |
1da177e4 LT |
589 | |
590 | class_dev = class_device_get(class_dev); | |
591 | if (!class_dev) | |
592 | return -EINVAL; | |
593 | ||
51d172d5 | 594 | if (!strlen(class_dev->class_id)) |
b7fe4a60 | 595 | goto out1; |
1da177e4 | 596 | |
51d172d5 GKH |
597 | parent_class = class_get(class_dev->class); |
598 | if (!parent_class) | |
b7fe4a60 SH |
599 | goto out1; |
600 | ||
51d172d5 | 601 | parent_class_dev = class_device_get(class_dev->parent); |
1da177e4 LT |
602 | |
603 | pr_debug("CLASS: registering class device: ID = '%s'\n", | |
604 | class_dev->class_id); | |
605 | ||
606 | /* first, register with generic layer. */ | |
b7fe4a60 SH |
607 | error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id); |
608 | if (error) | |
609 | goto out2; | |
610 | ||
51d172d5 GKH |
611 | if (parent_class_dev) |
612 | class_dev->kobj.parent = &parent_class_dev->kobj; | |
613 | else | |
614 | class_dev->kobj.parent = &parent_class->subsys.kset.kobj; | |
1da177e4 | 615 | |
51d172d5 GKH |
616 | error = kobject_add(&class_dev->kobj); |
617 | if (error) | |
b7fe4a60 | 618 | goto out2; |
1da177e4 | 619 | |
e9ba6365 | 620 | /* add the needed attributes to this device */ |
f0e1761a CH |
621 | error = sysfs_create_link(&class_dev->kobj, |
622 | &parent_class->subsys.kset.kobj, "subsystem"); | |
623 | if (error) | |
624 | goto out3; | |
a7fd6706 KS |
625 | class_dev->uevent_attr.attr.name = "uevent"; |
626 | class_dev->uevent_attr.attr.mode = S_IWUSR; | |
51d172d5 | 627 | class_dev->uevent_attr.attr.owner = parent_class->owner; |
a7fd6706 | 628 | class_dev->uevent_attr.store = store_uevent; |
b7fe4a60 SH |
629 | error = class_device_create_file(class_dev, &class_dev->uevent_attr); |
630 | if (error) | |
631 | goto out3; | |
a7fd6706 | 632 | |
e9ba6365 | 633 | if (MAJOR(class_dev->devt)) { |
634 | struct class_device_attribute *attr; | |
4aed0644 | 635 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
e9ba6365 | 636 | if (!attr) { |
637 | error = -ENOMEM; | |
b7fe4a60 | 638 | goto out4; |
e9ba6365 | 639 | } |
e9ba6365 | 640 | attr->attr.name = "dev"; |
641 | attr->attr.mode = S_IRUGO; | |
51d172d5 | 642 | attr->attr.owner = parent_class->owner; |
e9ba6365 | 643 | attr->show = show_dev; |
b7fe4a60 SH |
644 | error = class_device_create_file(class_dev, attr); |
645 | if (error) { | |
646 | kfree(attr); | |
647 | goto out4; | |
648 | } | |
649 | ||
e9ba6365 | 650 | class_dev->devt_attr = attr; |
651 | } | |
652 | ||
b7fe4a60 SH |
653 | error = class_device_add_attrs(class_dev); |
654 | if (error) | |
655 | goto out5; | |
656 | ||
76d1ce00 | 657 | if (class_dev->dev) { |
b7fe4a60 SH |
658 | error = sysfs_create_link(&class_dev->kobj, |
659 | &class_dev->dev->kobj, "device"); | |
660 | if (error) | |
661 | goto out6; | |
76d1ce00 | 662 | } |
e9ba6365 | 663 | |
b7fe4a60 | 664 | error = class_device_add_groups(class_dev); |
805fab47 KS |
665 | if (error) |
666 | goto out7; | |
667 | ||
668 | error = make_deprecated_class_device_links(class_dev); | |
b7fe4a60 SH |
669 | if (error) |
670 | goto out8; | |
1498221d | 671 | |
312c004d | 672 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
dbe9035d | 673 | |
e9ba6365 | 674 | /* notify any interfaces this device is now here */ |
a1438890 J |
675 | down(&parent_class->sem); |
676 | list_add_tail(&class_dev->node, &parent_class->children); | |
677 | list_for_each_entry(class_intf, &parent_class->interfaces, node) { | |
678 | if (class_intf->add) | |
679 | class_intf->add(class_dev, class_intf); | |
1da177e4 | 680 | } |
a1438890 | 681 | up(&parent_class->sem); |
e9ba6365 | 682 | |
b7fe4a60 SH |
683 | goto out1; |
684 | ||
685 | out8: | |
805fab47 | 686 | class_device_remove_groups(class_dev); |
b7fe4a60 SH |
687 | out7: |
688 | if (class_dev->dev) | |
689 | sysfs_remove_link(&class_dev->kobj, "device"); | |
690 | out6: | |
691 | class_device_remove_attrs(class_dev); | |
692 | out5: | |
693 | if (class_dev->devt_attr) | |
694 | class_device_remove_file(class_dev, class_dev->devt_attr); | |
695 | out4: | |
696 | class_device_remove_file(class_dev, &class_dev->uevent_attr); | |
697 | out3: | |
698 | kobject_del(&class_dev->kobj); | |
699 | out2: | |
700 | if(parent_class_dev) | |
51d172d5 | 701 | class_device_put(parent_class_dev); |
b7fe4a60 SH |
702 | class_put(parent_class); |
703 | out1: | |
1da177e4 LT |
704 | class_device_put(class_dev); |
705 | return error; | |
706 | } | |
707 | ||
708 | int class_device_register(struct class_device *class_dev) | |
709 | { | |
710 | class_device_initialize(class_dev); | |
711 | return class_device_add(class_dev); | |
712 | } | |
713 | ||
2fc68447 | 714 | /** |
715 | * class_device_create - creates a class device and registers it with sysfs | |
92a0f861 | 716 | * @cls: pointer to the struct class that this device should be registered to. |
51d172d5 | 717 | * @parent: pointer to the parent struct class_device of this new device, if any. |
92a0f861 | 718 | * @devt: the dev_t for the char device to be added. |
2fc68447 | 719 | * @device: a pointer to a struct device that is assiociated with this class device. |
720 | * @fmt: string for the class device's name | |
721 | * | |
722 | * This function can be used by char device classes. A struct | |
723 | * class_device will be created in sysfs, registered to the specified | |
51d172d5 GKH |
724 | * class. |
725 | * A "dev" file will be created, showing the dev_t for the device, if | |
726 | * the dev_t is not 0,0. | |
727 | * If a pointer to a parent struct class_device is passed in, the newly | |
728 | * created struct class_device will be a child of that device in sysfs. | |
729 | * The pointer to the struct class_device will be returned from the | |
730 | * call. Any further sysfs files that might be required can be created | |
731 | * using this pointer. | |
2fc68447 | 732 | * |
733 | * Note: the struct class passed to this function must have previously | |
734 | * been created with a call to class_create(). | |
735 | */ | |
51d172d5 GKH |
736 | struct class_device *class_device_create(struct class *cls, |
737 | struct class_device *parent, | |
738 | dev_t devt, | |
ddd5d35a DT |
739 | struct device *device, |
740 | const char *fmt, ...) | |
e9ba6365 | 741 | { |
742 | va_list args; | |
743 | struct class_device *class_dev = NULL; | |
744 | int retval = -ENODEV; | |
745 | ||
746 | if (cls == NULL || IS_ERR(cls)) | |
747 | goto error; | |
748 | ||
4aed0644 | 749 | class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL); |
e9ba6365 | 750 | if (!class_dev) { |
751 | retval = -ENOMEM; | |
752 | goto error; | |
753 | } | |
e9ba6365 | 754 | |
755 | class_dev->devt = devt; | |
756 | class_dev->dev = device; | |
757 | class_dev->class = cls; | |
51d172d5 GKH |
758 | class_dev->parent = parent; |
759 | class_dev->release = class_device_create_release; | |
312c004d | 760 | class_dev->uevent = class_device_create_uevent; |
e9ba6365 | 761 | |
762 | va_start(args, fmt); | |
763 | vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args); | |
764 | va_end(args); | |
765 | retval = class_device_register(class_dev); | |
766 | if (retval) | |
767 | goto error; | |
768 | ||
769 | return class_dev; | |
770 | ||
771 | error: | |
772 | kfree(class_dev); | |
773 | return ERR_PTR(retval); | |
774 | } | |
775 | ||
1da177e4 LT |
776 | void class_device_del(struct class_device *class_dev) |
777 | { | |
51d172d5 GKH |
778 | struct class *parent_class = class_dev->class; |
779 | struct class_device *parent_device = class_dev->parent; | |
780 | struct class_interface *class_intf; | |
1da177e4 | 781 | |
51d172d5 GKH |
782 | if (parent_class) { |
783 | down(&parent_class->sem); | |
1da177e4 | 784 | list_del_init(&class_dev->node); |
51d172d5 | 785 | list_for_each_entry(class_intf, &parent_class->interfaces, node) |
1da177e4 | 786 | if (class_intf->remove) |
d8539d81 | 787 | class_intf->remove(class_dev, class_intf); |
51d172d5 | 788 | up(&parent_class->sem); |
1da177e4 LT |
789 | } |
790 | ||
76d1ce00 | 791 | if (class_dev->dev) { |
805fab47 | 792 | remove_deprecated_class_device_links(class_dev); |
1da177e4 | 793 | sysfs_remove_link(&class_dev->kobj, "device"); |
76d1ce00 | 794 | } |
b9d9c82b | 795 | sysfs_remove_link(&class_dev->kobj, "subsystem"); |
a7fd6706 | 796 | class_device_remove_file(class_dev, &class_dev->uevent_attr); |
208f3d61 | 797 | if (class_dev->devt_attr) |
e9ba6365 | 798 | class_device_remove_file(class_dev, class_dev->devt_attr); |
1da177e4 | 799 | class_device_remove_attrs(class_dev); |
1498221d | 800 | class_device_remove_groups(class_dev); |
1da177e4 | 801 | |
312c004d | 802 | kobject_uevent(&class_dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
803 | kobject_del(&class_dev->kobj); |
804 | ||
51d172d5 GKH |
805 | class_device_put(parent_device); |
806 | class_put(parent_class); | |
1da177e4 LT |
807 | } |
808 | ||
809 | void class_device_unregister(struct class_device *class_dev) | |
810 | { | |
811 | pr_debug("CLASS: Unregistering class device. ID = '%s'\n", | |
812 | class_dev->class_id); | |
813 | class_device_del(class_dev); | |
814 | class_device_put(class_dev); | |
815 | } | |
816 | ||
2fc68447 | 817 | /** |
818 | * class_device_destroy - removes a class device that was created with class_device_create() | |
819 | * @cls: the pointer to the struct class that this device was registered * with. | |
92a0f861 | 820 | * @devt: the dev_t of the device that was previously registered. |
2fc68447 | 821 | * |
822 | * This call unregisters and cleans up a class device that was created with a | |
823 | * call to class_device_create() | |
824 | */ | |
e9ba6365 | 825 | void class_device_destroy(struct class *cls, dev_t devt) |
826 | { | |
827 | struct class_device *class_dev = NULL; | |
828 | struct class_device *class_dev_tmp; | |
829 | ||
830 | down(&cls->sem); | |
831 | list_for_each_entry(class_dev_tmp, &cls->children, node) { | |
832 | if (class_dev_tmp->devt == devt) { | |
833 | class_dev = class_dev_tmp; | |
834 | break; | |
835 | } | |
836 | } | |
837 | up(&cls->sem); | |
838 | ||
839 | if (class_dev) | |
840 | class_device_unregister(class_dev); | |
841 | } | |
842 | ||
1da177e4 LT |
843 | struct class_device * class_device_get(struct class_device *class_dev) |
844 | { | |
845 | if (class_dev) | |
846 | return to_class_dev(kobject_get(&class_dev->kobj)); | |
847 | return NULL; | |
848 | } | |
849 | ||
850 | void class_device_put(struct class_device *class_dev) | |
851 | { | |
51d172d5 GKH |
852 | if (class_dev) |
853 | kobject_put(&class_dev->kobj); | |
1da177e4 LT |
854 | } |
855 | ||
856 | ||
857 | int class_interface_register(struct class_interface *class_intf) | |
858 | { | |
859 | struct class *parent; | |
860 | struct class_device *class_dev; | |
c47ed219 | 861 | struct device *dev; |
1da177e4 LT |
862 | |
863 | if (!class_intf || !class_intf->class) | |
864 | return -ENODEV; | |
865 | ||
866 | parent = class_get(class_intf->class); | |
867 | if (!parent) | |
868 | return -EINVAL; | |
869 | ||
870 | down(&parent->sem); | |
871 | list_add_tail(&class_intf->node, &parent->interfaces); | |
872 | if (class_intf->add) { | |
873 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 874 | class_intf->add(class_dev, class_intf); |
1da177e4 | 875 | } |
c47ed219 GKH |
876 | if (class_intf->add_dev) { |
877 | list_for_each_entry(dev, &parent->devices, node) | |
878 | class_intf->add_dev(dev, class_intf); | |
879 | } | |
1da177e4 LT |
880 | up(&parent->sem); |
881 | ||
882 | return 0; | |
883 | } | |
884 | ||
885 | void class_interface_unregister(struct class_interface *class_intf) | |
886 | { | |
887 | struct class * parent = class_intf->class; | |
888 | struct class_device *class_dev; | |
c47ed219 | 889 | struct device *dev; |
1da177e4 LT |
890 | |
891 | if (!parent) | |
892 | return; | |
893 | ||
894 | down(&parent->sem); | |
895 | list_del_init(&class_intf->node); | |
896 | if (class_intf->remove) { | |
897 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 898 | class_intf->remove(class_dev, class_intf); |
1da177e4 | 899 | } |
c47ed219 GKH |
900 | if (class_intf->remove_dev) { |
901 | list_for_each_entry(dev, &parent->devices, node) | |
902 | class_intf->remove_dev(dev, class_intf); | |
903 | } | |
1da177e4 LT |
904 | up(&parent->sem); |
905 | ||
906 | class_put(parent); | |
907 | } | |
908 | ||
1da177e4 LT |
909 | int __init classes_init(void) |
910 | { | |
911 | int retval; | |
912 | ||
913 | retval = subsystem_register(&class_subsys); | |
914 | if (retval) | |
915 | return retval; | |
916 | ||
917 | /* ick, this is ugly, the things we go through to keep from showing up | |
918 | * in sysfs... */ | |
919 | subsystem_init(&class_obj_subsys); | |
920 | if (!class_obj_subsys.kset.subsys) | |
921 | class_obj_subsys.kset.subsys = &class_obj_subsys; | |
922 | return 0; | |
923 | } | |
924 | ||
925 | EXPORT_SYMBOL_GPL(class_create_file); | |
926 | EXPORT_SYMBOL_GPL(class_remove_file); | |
927 | EXPORT_SYMBOL_GPL(class_register); | |
928 | EXPORT_SYMBOL_GPL(class_unregister); | |
e9ba6365 | 929 | EXPORT_SYMBOL_GPL(class_create); |
930 | EXPORT_SYMBOL_GPL(class_destroy); | |
1da177e4 LT |
931 | |
932 | EXPORT_SYMBOL_GPL(class_device_register); | |
933 | EXPORT_SYMBOL_GPL(class_device_unregister); | |
934 | EXPORT_SYMBOL_GPL(class_device_initialize); | |
935 | EXPORT_SYMBOL_GPL(class_device_add); | |
936 | EXPORT_SYMBOL_GPL(class_device_del); | |
937 | EXPORT_SYMBOL_GPL(class_device_get); | |
938 | EXPORT_SYMBOL_GPL(class_device_put); | |
e9ba6365 | 939 | EXPORT_SYMBOL_GPL(class_device_create); |
940 | EXPORT_SYMBOL_GPL(class_device_destroy); | |
1da177e4 LT |
941 | EXPORT_SYMBOL_GPL(class_device_create_file); |
942 | EXPORT_SYMBOL_GPL(class_device_remove_file); | |
943 | EXPORT_SYMBOL_GPL(class_device_create_bin_file); | |
944 | EXPORT_SYMBOL_GPL(class_device_remove_bin_file); | |
945 | ||
946 | EXPORT_SYMBOL_GPL(class_interface_register); | |
947 | EXPORT_SYMBOL_GPL(class_interface_unregister); |