Commit | Line | Data |
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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 | ||
13 | #include <linux/config.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/kdev_t.h> | |
e9ba6365 | 19 | #include <linux/err.h> |
1da177e4 LT |
20 | #include "base.h" |
21 | ||
22 | #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) | |
23 | #define to_class(obj) container_of(obj, struct class, subsys.kset.kobj) | |
24 | ||
25 | static ssize_t | |
26 | class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
27 | { | |
28 | struct class_attribute * class_attr = to_class_attr(attr); | |
29 | struct class * dc = to_class(kobj); | |
4a0c20bf | 30 | ssize_t ret = -EIO; |
1da177e4 LT |
31 | |
32 | if (class_attr->show) | |
33 | ret = class_attr->show(dc, buf); | |
34 | return ret; | |
35 | } | |
36 | ||
37 | static ssize_t | |
38 | class_attr_store(struct kobject * kobj, struct attribute * attr, | |
39 | const char * buf, size_t count) | |
40 | { | |
41 | struct class_attribute * class_attr = to_class_attr(attr); | |
42 | struct class * dc = to_class(kobj); | |
4a0c20bf | 43 | ssize_t ret = -EIO; |
1da177e4 LT |
44 | |
45 | if (class_attr->store) | |
46 | ret = class_attr->store(dc, buf, count); | |
47 | return ret; | |
48 | } | |
49 | ||
50 | static void class_release(struct kobject * kobj) | |
51 | { | |
52 | struct class *class = to_class(kobj); | |
53 | ||
54 | pr_debug("class '%s': release.\n", class->name); | |
55 | ||
56 | if (class->class_release) | |
57 | class->class_release(class); | |
58 | else | |
59 | pr_debug("class '%s' does not have a release() function, " | |
60 | "be careful\n", class->name); | |
61 | } | |
62 | ||
63 | static struct sysfs_ops class_sysfs_ops = { | |
64 | .show = class_attr_show, | |
65 | .store = class_attr_store, | |
66 | }; | |
67 | ||
68 | static struct kobj_type ktype_class = { | |
69 | .sysfs_ops = &class_sysfs_ops, | |
70 | .release = class_release, | |
71 | }; | |
72 | ||
73 | /* Hotplug events for classes go to the class_obj subsys */ | |
74 | static decl_subsys(class, &ktype_class, NULL); | |
75 | ||
76 | ||
77 | int class_create_file(struct class * cls, const struct class_attribute * attr) | |
78 | { | |
79 | int error; | |
80 | if (cls) { | |
81 | error = sysfs_create_file(&cls->subsys.kset.kobj, &attr->attr); | |
82 | } else | |
83 | error = -EINVAL; | |
84 | return error; | |
85 | } | |
86 | ||
87 | void class_remove_file(struct class * cls, const struct class_attribute * attr) | |
88 | { | |
89 | if (cls) | |
90 | sysfs_remove_file(&cls->subsys.kset.kobj, &attr->attr); | |
91 | } | |
92 | ||
93 | struct class * class_get(struct class * cls) | |
94 | { | |
95 | if (cls) | |
96 | return container_of(subsys_get(&cls->subsys), struct class, subsys); | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | void class_put(struct class * cls) | |
101 | { | |
102 | subsys_put(&cls->subsys); | |
103 | } | |
104 | ||
105 | ||
106 | static int add_class_attrs(struct class * cls) | |
107 | { | |
108 | int i; | |
109 | int error = 0; | |
110 | ||
111 | if (cls->class_attrs) { | |
112 | for (i = 0; attr_name(cls->class_attrs[i]); i++) { | |
113 | error = class_create_file(cls,&cls->class_attrs[i]); | |
114 | if (error) | |
115 | goto Err; | |
116 | } | |
117 | } | |
118 | Done: | |
119 | return error; | |
120 | Err: | |
121 | while (--i >= 0) | |
122 | class_remove_file(cls,&cls->class_attrs[i]); | |
123 | goto Done; | |
124 | } | |
125 | ||
126 | static void remove_class_attrs(struct class * cls) | |
127 | { | |
128 | int i; | |
129 | ||
130 | if (cls->class_attrs) { | |
131 | for (i = 0; attr_name(cls->class_attrs[i]); i++) | |
132 | class_remove_file(cls,&cls->class_attrs[i]); | |
133 | } | |
134 | } | |
135 | ||
136 | int class_register(struct class * cls) | |
137 | { | |
138 | int error; | |
139 | ||
140 | pr_debug("device class '%s': registering\n", cls->name); | |
141 | ||
142 | INIT_LIST_HEAD(&cls->children); | |
143 | INIT_LIST_HEAD(&cls->interfaces); | |
144 | init_MUTEX(&cls->sem); | |
145 | error = kobject_set_name(&cls->subsys.kset.kobj, "%s", cls->name); | |
146 | if (error) | |
147 | return error; | |
148 | ||
149 | subsys_set_kset(cls, class_subsys); | |
150 | ||
151 | error = subsystem_register(&cls->subsys); | |
152 | if (!error) { | |
153 | error = add_class_attrs(class_get(cls)); | |
154 | class_put(cls); | |
155 | } | |
156 | return error; | |
157 | } | |
158 | ||
159 | void class_unregister(struct class * cls) | |
160 | { | |
161 | pr_debug("device class '%s': unregistering\n", cls->name); | |
162 | remove_class_attrs(cls); | |
163 | subsystem_unregister(&cls->subsys); | |
164 | } | |
165 | ||
e9ba6365 GKH |
166 | static void class_create_release(struct class *cls) |
167 | { | |
168 | kfree(cls); | |
169 | } | |
170 | ||
171 | static void class_device_create_release(struct class_device *class_dev) | |
172 | { | |
173 | kfree(class_dev); | |
174 | } | |
175 | ||
2fc68447 GKH |
176 | /** |
177 | * class_create - create a struct class structure | |
178 | * @owner: pointer to the module that is to "own" this struct class | |
179 | * @name: pointer to a string for the name of this class. | |
180 | * | |
181 | * This is used to create a struct class pointer that can then be used | |
182 | * in calls to class_device_create(). | |
183 | * | |
184 | * Note, the pointer created here is to be destroyed when finished by | |
185 | * making a call to class_destroy(). | |
186 | */ | |
e9ba6365 GKH |
187 | struct class *class_create(struct module *owner, char *name) |
188 | { | |
189 | struct class *cls; | |
190 | int retval; | |
191 | ||
192 | cls = kmalloc(sizeof(struct class), GFP_KERNEL); | |
193 | if (!cls) { | |
194 | retval = -ENOMEM; | |
195 | goto error; | |
196 | } | |
197 | memset(cls, 0x00, sizeof(struct class)); | |
198 | ||
199 | cls->name = name; | |
200 | cls->owner = owner; | |
201 | cls->class_release = class_create_release; | |
202 | cls->release = class_device_create_release; | |
203 | ||
204 | retval = class_register(cls); | |
205 | if (retval) | |
206 | goto error; | |
207 | ||
208 | return cls; | |
209 | ||
210 | error: | |
211 | kfree(cls); | |
212 | return ERR_PTR(retval); | |
213 | } | |
214 | ||
2fc68447 GKH |
215 | /** |
216 | * class_destroy - destroys a struct class structure | |
217 | * @cs: pointer to the struct class that is to be destroyed | |
218 | * | |
219 | * Note, the pointer to be destroyed must have been created with a call | |
220 | * to class_create(). | |
221 | */ | |
e9ba6365 GKH |
222 | void class_destroy(struct class *cls) |
223 | { | |
224 | if ((cls == NULL) || (IS_ERR(cls))) | |
225 | return; | |
226 | ||
227 | class_unregister(cls); | |
228 | } | |
1da177e4 LT |
229 | |
230 | /* Class Device Stuff */ | |
231 | ||
232 | int class_device_create_file(struct class_device * class_dev, | |
233 | const struct class_device_attribute * attr) | |
234 | { | |
235 | int error = -EINVAL; | |
236 | if (class_dev) | |
237 | error = sysfs_create_file(&class_dev->kobj, &attr->attr); | |
238 | return error; | |
239 | } | |
240 | ||
241 | void class_device_remove_file(struct class_device * class_dev, | |
242 | const struct class_device_attribute * attr) | |
243 | { | |
244 | if (class_dev) | |
245 | sysfs_remove_file(&class_dev->kobj, &attr->attr); | |
246 | } | |
247 | ||
248 | int class_device_create_bin_file(struct class_device *class_dev, | |
249 | struct bin_attribute *attr) | |
250 | { | |
251 | int error = -EINVAL; | |
252 | if (class_dev) | |
253 | error = sysfs_create_bin_file(&class_dev->kobj, attr); | |
254 | return error; | |
255 | } | |
256 | ||
257 | void class_device_remove_bin_file(struct class_device *class_dev, | |
258 | struct bin_attribute *attr) | |
259 | { | |
260 | if (class_dev) | |
261 | sysfs_remove_bin_file(&class_dev->kobj, attr); | |
262 | } | |
263 | ||
264 | static ssize_t | |
265 | class_device_attr_show(struct kobject * kobj, struct attribute * attr, | |
266 | char * buf) | |
267 | { | |
268 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
269 | struct class_device * cd = to_class_dev(kobj); | |
270 | ssize_t ret = 0; | |
271 | ||
272 | if (class_dev_attr->show) | |
273 | ret = class_dev_attr->show(cd, buf); | |
274 | return ret; | |
275 | } | |
276 | ||
277 | static ssize_t | |
278 | class_device_attr_store(struct kobject * kobj, struct attribute * attr, | |
279 | const char * buf, size_t count) | |
280 | { | |
281 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
282 | struct class_device * cd = to_class_dev(kobj); | |
283 | ssize_t ret = 0; | |
284 | ||
285 | if (class_dev_attr->store) | |
286 | ret = class_dev_attr->store(cd, buf, count); | |
287 | return ret; | |
288 | } | |
289 | ||
290 | static struct sysfs_ops class_dev_sysfs_ops = { | |
291 | .show = class_device_attr_show, | |
292 | .store = class_device_attr_store, | |
293 | }; | |
294 | ||
295 | static void class_dev_release(struct kobject * kobj) | |
296 | { | |
297 | struct class_device *cd = to_class_dev(kobj); | |
298 | struct class * cls = cd->class; | |
299 | ||
300 | pr_debug("device class '%s': release.\n", cd->class_id); | |
301 | ||
fef6ec8d JJ |
302 | kfree(cd->devt_attr); |
303 | cd->devt_attr = NULL; | |
208f3d61 | 304 | |
1da177e4 LT |
305 | if (cls->release) |
306 | cls->release(cd); | |
307 | else { | |
308 | printk(KERN_ERR "Device class '%s' does not have a release() function, " | |
309 | "it is broken and must be fixed.\n", | |
310 | cd->class_id); | |
311 | WARN_ON(1); | |
312 | } | |
313 | } | |
314 | ||
315 | static struct kobj_type ktype_class_device = { | |
316 | .sysfs_ops = &class_dev_sysfs_ops, | |
317 | .release = class_dev_release, | |
318 | }; | |
319 | ||
320 | static int class_hotplug_filter(struct kset *kset, struct kobject *kobj) | |
321 | { | |
322 | struct kobj_type *ktype = get_ktype(kobj); | |
323 | ||
324 | if (ktype == &ktype_class_device) { | |
325 | struct class_device *class_dev = to_class_dev(kobj); | |
326 | if (class_dev->class) | |
327 | return 1; | |
328 | } | |
329 | return 0; | |
330 | } | |
331 | ||
419cab3f | 332 | static const char *class_hotplug_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
333 | { |
334 | struct class_device *class_dev = to_class_dev(kobj); | |
335 | ||
336 | return class_dev->class->name; | |
337 | } | |
338 | ||
339 | static int class_hotplug(struct kset *kset, struct kobject *kobj, char **envp, | |
340 | int num_envp, char *buffer, int buffer_size) | |
341 | { | |
342 | struct class_device *class_dev = to_class_dev(kobj); | |
343 | int i = 0; | |
344 | int length = 0; | |
345 | int retval = 0; | |
346 | ||
347 | pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); | |
348 | ||
349 | if (class_dev->dev) { | |
350 | /* add physical device, backing this device */ | |
351 | struct device *dev = class_dev->dev; | |
352 | char *path = kobject_get_path(&dev->kobj, GFP_KERNEL); | |
353 | ||
354 | add_hotplug_env_var(envp, num_envp, &i, buffer, buffer_size, | |
355 | &length, "PHYSDEVPATH=%s", path); | |
356 | kfree(path); | |
357 | ||
358 | if (dev->bus) | |
359 | add_hotplug_env_var(envp, num_envp, &i, | |
360 | buffer, buffer_size, &length, | |
361 | "PHYSDEVBUS=%s", dev->bus->name); | |
362 | ||
363 | if (dev->driver) | |
364 | add_hotplug_env_var(envp, num_envp, &i, | |
365 | buffer, buffer_size, &length, | |
366 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
367 | } | |
368 | ||
369 | if (MAJOR(class_dev->devt)) { | |
370 | add_hotplug_env_var(envp, num_envp, &i, | |
371 | buffer, buffer_size, &length, | |
372 | "MAJOR=%u", MAJOR(class_dev->devt)); | |
373 | ||
374 | add_hotplug_env_var(envp, num_envp, &i, | |
375 | buffer, buffer_size, &length, | |
376 | "MINOR=%u", MINOR(class_dev->devt)); | |
377 | } | |
378 | ||
379 | /* terminate, set to next free slot, shrink available space */ | |
380 | envp[i] = NULL; | |
381 | envp = &envp[i]; | |
382 | num_envp -= i; | |
383 | buffer = &buffer[length]; | |
384 | buffer_size -= length; | |
385 | ||
386 | if (class_dev->class->hotplug) { | |
387 | /* have the bus specific function add its stuff */ | |
388 | retval = class_dev->class->hotplug (class_dev, envp, num_envp, | |
389 | buffer, buffer_size); | |
390 | if (retval) { | |
391 | pr_debug ("%s - hotplug() returned %d\n", | |
392 | __FUNCTION__, retval); | |
393 | } | |
394 | } | |
395 | ||
396 | return retval; | |
397 | } | |
398 | ||
399 | static struct kset_hotplug_ops class_hotplug_ops = { | |
400 | .filter = class_hotplug_filter, | |
401 | .name = class_hotplug_name, | |
402 | .hotplug = class_hotplug, | |
403 | }; | |
404 | ||
405 | static decl_subsys(class_obj, &ktype_class_device, &class_hotplug_ops); | |
406 | ||
407 | ||
408 | static int class_device_add_attrs(struct class_device * cd) | |
409 | { | |
410 | int i; | |
411 | int error = 0; | |
412 | struct class * cls = cd->class; | |
413 | ||
414 | if (cls->class_dev_attrs) { | |
415 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { | |
416 | error = class_device_create_file(cd, | |
417 | &cls->class_dev_attrs[i]); | |
418 | if (error) | |
419 | goto Err; | |
420 | } | |
421 | } | |
422 | Done: | |
423 | return error; | |
424 | Err: | |
425 | while (--i >= 0) | |
426 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
427 | goto Done; | |
428 | } | |
429 | ||
430 | static void class_device_remove_attrs(struct class_device * cd) | |
431 | { | |
432 | int i; | |
433 | struct class * cls = cd->class; | |
434 | ||
435 | if (cls->class_dev_attrs) { | |
436 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) | |
437 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
438 | } | |
439 | } | |
440 | ||
441 | static ssize_t show_dev(struct class_device *class_dev, char *buf) | |
442 | { | |
443 | return print_dev_t(buf, class_dev->devt); | |
444 | } | |
1da177e4 LT |
445 | |
446 | void class_device_initialize(struct class_device *class_dev) | |
447 | { | |
448 | kobj_set_kset_s(class_dev, class_obj_subsys); | |
449 | kobject_init(&class_dev->kobj); | |
450 | INIT_LIST_HEAD(&class_dev->node); | |
451 | } | |
452 | ||
76d1ce00 DT |
453 | static char *make_class_name(struct class_device *class_dev) |
454 | { | |
455 | char *name; | |
456 | int size; | |
457 | ||
458 | size = strlen(class_dev->class->name) + | |
459 | strlen(kobject_name(&class_dev->kobj)) + 2; | |
460 | ||
461 | name = kmalloc(size, GFP_KERNEL); | |
462 | if (!name) | |
463 | return ERR_PTR(-ENOMEM); | |
464 | ||
465 | strcpy(name, class_dev->class->name); | |
466 | strcat(name, ":"); | |
467 | strcat(name, kobject_name(&class_dev->kobj)); | |
468 | return name; | |
469 | } | |
470 | ||
1da177e4 LT |
471 | int class_device_add(struct class_device *class_dev) |
472 | { | |
473 | struct class * parent = NULL; | |
474 | struct class_interface * class_intf; | |
76d1ce00 | 475 | char *class_name = NULL; |
1da177e4 LT |
476 | int error; |
477 | ||
478 | class_dev = class_device_get(class_dev); | |
479 | if (!class_dev) | |
480 | return -EINVAL; | |
481 | ||
482 | if (!strlen(class_dev->class_id)) { | |
483 | error = -EINVAL; | |
484 | goto register_done; | |
485 | } | |
486 | ||
487 | parent = class_get(class_dev->class); | |
488 | ||
489 | pr_debug("CLASS: registering class device: ID = '%s'\n", | |
490 | class_dev->class_id); | |
491 | ||
492 | /* first, register with generic layer. */ | |
493 | kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id); | |
494 | if (parent) | |
495 | class_dev->kobj.parent = &parent->subsys.kset.kobj; | |
496 | ||
497 | if ((error = kobject_add(&class_dev->kobj))) | |
498 | goto register_done; | |
499 | ||
e9ba6365 GKH |
500 | /* add the needed attributes to this device */ |
501 | if (MAJOR(class_dev->devt)) { | |
502 | struct class_device_attribute *attr; | |
503 | attr = kmalloc(sizeof(*attr), GFP_KERNEL); | |
504 | if (!attr) { | |
505 | error = -ENOMEM; | |
506 | kobject_del(&class_dev->kobj); | |
507 | goto register_done; | |
508 | } | |
509 | memset(attr, sizeof(*attr), 0x00); | |
510 | attr->attr.name = "dev"; | |
511 | attr->attr.mode = S_IRUGO; | |
512 | attr->attr.owner = parent->owner; | |
513 | attr->show = show_dev; | |
514 | attr->store = NULL; | |
515 | class_device_create_file(class_dev, attr); | |
516 | class_dev->devt_attr = attr; | |
517 | } | |
518 | ||
519 | class_device_add_attrs(class_dev); | |
76d1ce00 DT |
520 | if (class_dev->dev) { |
521 | class_name = make_class_name(class_dev); | |
e9ba6365 GKH |
522 | sysfs_create_link(&class_dev->kobj, |
523 | &class_dev->dev->kobj, "device"); | |
76d1ce00 DT |
524 | sysfs_create_link(&class_dev->dev->kobj, &class_dev->kobj, |
525 | class_name); | |
526 | } | |
e9ba6365 GKH |
527 | |
528 | /* notify any interfaces this device is now here */ | |
1da177e4 LT |
529 | if (parent) { |
530 | down(&parent->sem); | |
531 | list_add_tail(&class_dev->node, &parent->children); | |
532 | list_for_each_entry(class_intf, &parent->interfaces, node) | |
533 | if (class_intf->add) | |
534 | class_intf->add(class_dev); | |
535 | up(&parent->sem); | |
536 | } | |
0700f56b | 537 | kobject_hotplug(&class_dev->kobj, KOBJ_ADD); |
e9ba6365 | 538 | |
1da177e4 LT |
539 | register_done: |
540 | if (error && parent) | |
541 | class_put(parent); | |
542 | class_device_put(class_dev); | |
76d1ce00 | 543 | kfree(class_name); |
1da177e4 LT |
544 | return error; |
545 | } | |
546 | ||
547 | int class_device_register(struct class_device *class_dev) | |
548 | { | |
549 | class_device_initialize(class_dev); | |
550 | return class_device_add(class_dev); | |
551 | } | |
552 | ||
2fc68447 GKH |
553 | /** |
554 | * class_device_create - creates a class device and registers it with sysfs | |
555 | * @cs: pointer to the struct class that this device should be registered to. | |
556 | * @dev: the dev_t for the char device to be added. | |
557 | * @device: a pointer to a struct device that is assiociated with this class device. | |
558 | * @fmt: string for the class device's name | |
559 | * | |
560 | * This function can be used by char device classes. A struct | |
561 | * class_device will be created in sysfs, registered to the specified | |
562 | * class. A "dev" file will be created, showing the dev_t for the | |
563 | * device. The pointer to the struct class_device will be returned from | |
564 | * the call. Any further sysfs files that might be required can be | |
565 | * created using this pointer. | |
566 | * | |
567 | * Note: the struct class passed to this function must have previously | |
568 | * been created with a call to class_create(). | |
569 | */ | |
e9ba6365 GKH |
570 | struct class_device *class_device_create(struct class *cls, dev_t devt, |
571 | struct device *device, char *fmt, ...) | |
572 | { | |
573 | va_list args; | |
574 | struct class_device *class_dev = NULL; | |
575 | int retval = -ENODEV; | |
576 | ||
577 | if (cls == NULL || IS_ERR(cls)) | |
578 | goto error; | |
579 | ||
580 | class_dev = kmalloc(sizeof(struct class_device), GFP_KERNEL); | |
581 | if (!class_dev) { | |
582 | retval = -ENOMEM; | |
583 | goto error; | |
584 | } | |
585 | memset(class_dev, 0x00, sizeof(struct class_device)); | |
586 | ||
587 | class_dev->devt = devt; | |
588 | class_dev->dev = device; | |
589 | class_dev->class = cls; | |
590 | ||
591 | va_start(args, fmt); | |
592 | vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args); | |
593 | va_end(args); | |
594 | retval = class_device_register(class_dev); | |
595 | if (retval) | |
596 | goto error; | |
597 | ||
598 | return class_dev; | |
599 | ||
600 | error: | |
601 | kfree(class_dev); | |
602 | return ERR_PTR(retval); | |
603 | } | |
604 | ||
1da177e4 LT |
605 | void class_device_del(struct class_device *class_dev) |
606 | { | |
607 | struct class * parent = class_dev->class; | |
608 | struct class_interface * class_intf; | |
76d1ce00 | 609 | char *class_name = NULL; |
1da177e4 LT |
610 | |
611 | if (parent) { | |
612 | down(&parent->sem); | |
613 | list_del_init(&class_dev->node); | |
614 | list_for_each_entry(class_intf, &parent->interfaces, node) | |
615 | if (class_intf->remove) | |
616 | class_intf->remove(class_dev); | |
617 | up(&parent->sem); | |
618 | } | |
619 | ||
76d1ce00 DT |
620 | if (class_dev->dev) { |
621 | class_name = make_class_name(class_dev); | |
1da177e4 | 622 | sysfs_remove_link(&class_dev->kobj, "device"); |
76d1ce00 DT |
623 | sysfs_remove_link(&class_dev->dev->kobj, class_name); |
624 | } | |
208f3d61 | 625 | if (class_dev->devt_attr) |
e9ba6365 | 626 | class_device_remove_file(class_dev, class_dev->devt_attr); |
1da177e4 LT |
627 | class_device_remove_attrs(class_dev); |
628 | ||
0700f56b | 629 | kobject_hotplug(&class_dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
630 | kobject_del(&class_dev->kobj); |
631 | ||
632 | if (parent) | |
633 | class_put(parent); | |
76d1ce00 | 634 | kfree(class_name); |
1da177e4 LT |
635 | } |
636 | ||
637 | void class_device_unregister(struct class_device *class_dev) | |
638 | { | |
639 | pr_debug("CLASS: Unregistering class device. ID = '%s'\n", | |
640 | class_dev->class_id); | |
641 | class_device_del(class_dev); | |
642 | class_device_put(class_dev); | |
643 | } | |
644 | ||
2fc68447 GKH |
645 | /** |
646 | * class_device_destroy - removes a class device that was created with class_device_create() | |
647 | * @cls: the pointer to the struct class that this device was registered * with. | |
648 | * @dev: the dev_t of the device that was previously registered. | |
649 | * | |
650 | * This call unregisters and cleans up a class device that was created with a | |
651 | * call to class_device_create() | |
652 | */ | |
e9ba6365 GKH |
653 | void class_device_destroy(struct class *cls, dev_t devt) |
654 | { | |
655 | struct class_device *class_dev = NULL; | |
656 | struct class_device *class_dev_tmp; | |
657 | ||
658 | down(&cls->sem); | |
659 | list_for_each_entry(class_dev_tmp, &cls->children, node) { | |
660 | if (class_dev_tmp->devt == devt) { | |
661 | class_dev = class_dev_tmp; | |
662 | break; | |
663 | } | |
664 | } | |
665 | up(&cls->sem); | |
666 | ||
667 | if (class_dev) | |
668 | class_device_unregister(class_dev); | |
669 | } | |
670 | ||
1da177e4 LT |
671 | int class_device_rename(struct class_device *class_dev, char *new_name) |
672 | { | |
673 | int error = 0; | |
674 | ||
675 | class_dev = class_device_get(class_dev); | |
676 | if (!class_dev) | |
677 | return -EINVAL; | |
678 | ||
679 | pr_debug("CLASS: renaming '%s' to '%s'\n", class_dev->class_id, | |
680 | new_name); | |
681 | ||
682 | strlcpy(class_dev->class_id, new_name, KOBJ_NAME_LEN); | |
683 | ||
684 | error = kobject_rename(&class_dev->kobj, new_name); | |
685 | ||
686 | class_device_put(class_dev); | |
687 | ||
688 | return error; | |
689 | } | |
690 | ||
691 | struct class_device * class_device_get(struct class_device *class_dev) | |
692 | { | |
693 | if (class_dev) | |
694 | return to_class_dev(kobject_get(&class_dev->kobj)); | |
695 | return NULL; | |
696 | } | |
697 | ||
698 | void class_device_put(struct class_device *class_dev) | |
699 | { | |
700 | kobject_put(&class_dev->kobj); | |
701 | } | |
702 | ||
703 | ||
704 | int class_interface_register(struct class_interface *class_intf) | |
705 | { | |
706 | struct class *parent; | |
707 | struct class_device *class_dev; | |
708 | ||
709 | if (!class_intf || !class_intf->class) | |
710 | return -ENODEV; | |
711 | ||
712 | parent = class_get(class_intf->class); | |
713 | if (!parent) | |
714 | return -EINVAL; | |
715 | ||
716 | down(&parent->sem); | |
717 | list_add_tail(&class_intf->node, &parent->interfaces); | |
718 | if (class_intf->add) { | |
719 | list_for_each_entry(class_dev, &parent->children, node) | |
720 | class_intf->add(class_dev); | |
721 | } | |
722 | up(&parent->sem); | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
727 | void class_interface_unregister(struct class_interface *class_intf) | |
728 | { | |
729 | struct class * parent = class_intf->class; | |
730 | struct class_device *class_dev; | |
731 | ||
732 | if (!parent) | |
733 | return; | |
734 | ||
735 | down(&parent->sem); | |
736 | list_del_init(&class_intf->node); | |
737 | if (class_intf->remove) { | |
738 | list_for_each_entry(class_dev, &parent->children, node) | |
739 | class_intf->remove(class_dev); | |
740 | } | |
741 | up(&parent->sem); | |
742 | ||
743 | class_put(parent); | |
744 | } | |
745 | ||
746 | ||
747 | ||
748 | int __init classes_init(void) | |
749 | { | |
750 | int retval; | |
751 | ||
752 | retval = subsystem_register(&class_subsys); | |
753 | if (retval) | |
754 | return retval; | |
755 | ||
756 | /* ick, this is ugly, the things we go through to keep from showing up | |
757 | * in sysfs... */ | |
758 | subsystem_init(&class_obj_subsys); | |
759 | if (!class_obj_subsys.kset.subsys) | |
760 | class_obj_subsys.kset.subsys = &class_obj_subsys; | |
761 | return 0; | |
762 | } | |
763 | ||
764 | EXPORT_SYMBOL_GPL(class_create_file); | |
765 | EXPORT_SYMBOL_GPL(class_remove_file); | |
766 | EXPORT_SYMBOL_GPL(class_register); | |
767 | EXPORT_SYMBOL_GPL(class_unregister); | |
768 | EXPORT_SYMBOL_GPL(class_get); | |
769 | EXPORT_SYMBOL_GPL(class_put); | |
e9ba6365 GKH |
770 | EXPORT_SYMBOL_GPL(class_create); |
771 | EXPORT_SYMBOL_GPL(class_destroy); | |
1da177e4 LT |
772 | |
773 | EXPORT_SYMBOL_GPL(class_device_register); | |
774 | EXPORT_SYMBOL_GPL(class_device_unregister); | |
775 | EXPORT_SYMBOL_GPL(class_device_initialize); | |
776 | EXPORT_SYMBOL_GPL(class_device_add); | |
777 | EXPORT_SYMBOL_GPL(class_device_del); | |
778 | EXPORT_SYMBOL_GPL(class_device_get); | |
779 | EXPORT_SYMBOL_GPL(class_device_put); | |
e9ba6365 GKH |
780 | EXPORT_SYMBOL_GPL(class_device_create); |
781 | EXPORT_SYMBOL_GPL(class_device_destroy); | |
1da177e4 LT |
782 | EXPORT_SYMBOL_GPL(class_device_create_file); |
783 | EXPORT_SYMBOL_GPL(class_device_remove_file); | |
784 | EXPORT_SYMBOL_GPL(class_device_create_bin_file); | |
785 | EXPORT_SYMBOL_GPL(class_device_remove_bin_file); | |
786 | ||
787 | EXPORT_SYMBOL_GPL(class_interface_register); | |
788 | EXPORT_SYMBOL_GPL(class_interface_unregister); |