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 | ||
22 | #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) | |
823bccfc | 23 | #define to_class(obj) container_of(obj, struct class, subsys.kobj) |
1da177e4 LT |
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 | ||
adc56808 | 68 | static struct kobj_type class_ktype = { |
1da177e4 LT |
69 | .sysfs_ops = &class_sysfs_ops, |
70 | .release = class_release, | |
71 | }; | |
72 | ||
73 | /* Hotplug events for classes go to the class_obj subsys */ | |
3514faca | 74 | static decl_subsys(class, NULL); |
1da177e4 LT |
75 | |
76 | ||
77 | int class_create_file(struct class * cls, const struct class_attribute * attr) | |
78 | { | |
79 | int error; | |
80 | if (cls) { | |
823bccfc | 81 | error = sysfs_create_file(&cls->subsys.kobj, &attr->attr); |
1da177e4 LT |
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) | |
823bccfc | 90 | sysfs_remove_file(&cls->subsys.kobj, &attr->attr); |
1da177e4 LT |
91 | } |
92 | ||
1740757e | 93 | static struct class *class_get(struct class *cls) |
1da177e4 LT |
94 | { |
95 | if (cls) | |
1ef4cfac | 96 | return container_of(kset_get(&cls->subsys), struct class, subsys); |
1da177e4 LT |
97 | return NULL; |
98 | } | |
99 | ||
1740757e | 100 | static void class_put(struct class * cls) |
1da177e4 | 101 | { |
51d172d5 | 102 | if (cls) |
6e9d930d | 103 | kset_put(&cls->subsys); |
1da177e4 LT |
104 | } |
105 | ||
106 | ||
107 | static int add_class_attrs(struct class * cls) | |
108 | { | |
109 | int i; | |
110 | int error = 0; | |
111 | ||
112 | if (cls->class_attrs) { | |
113 | for (i = 0; attr_name(cls->class_attrs[i]); i++) { | |
114 | error = class_create_file(cls,&cls->class_attrs[i]); | |
115 | if (error) | |
116 | goto Err; | |
117 | } | |
118 | } | |
119 | Done: | |
120 | return error; | |
121 | Err: | |
122 | while (--i >= 0) | |
123 | class_remove_file(cls,&cls->class_attrs[i]); | |
124 | goto Done; | |
125 | } | |
126 | ||
127 | static void remove_class_attrs(struct class * cls) | |
128 | { | |
129 | int i; | |
130 | ||
131 | if (cls->class_attrs) { | |
132 | for (i = 0; attr_name(cls->class_attrs[i]); i++) | |
133 | class_remove_file(cls,&cls->class_attrs[i]); | |
134 | } | |
135 | } | |
136 | ||
137 | int class_register(struct class * cls) | |
138 | { | |
139 | int error; | |
140 | ||
141 | pr_debug("device class '%s': registering\n", cls->name); | |
142 | ||
143 | INIT_LIST_HEAD(&cls->children); | |
23681e47 | 144 | INIT_LIST_HEAD(&cls->devices); |
1da177e4 | 145 | INIT_LIST_HEAD(&cls->interfaces); |
86406245 | 146 | kset_init(&cls->class_dirs); |
1da177e4 | 147 | init_MUTEX(&cls->sem); |
823bccfc | 148 | error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name); |
1da177e4 LT |
149 | if (error) |
150 | return error; | |
151 | ||
d6b05b84 | 152 | cls->subsys.kobj.kset = &class_subsys; |
3514faca | 153 | cls->subsys.kobj.ktype = &class_ktype; |
1da177e4 LT |
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, |
7eff2e7a | 184 | struct kobj_uevent_env *env) |
51d172d5 GKH |
185 | { |
186 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); | |
187 | return 0; | |
188 | } | |
189 | ||
2fc68447 | 190 | /** |
191 | * class_create - create a struct class structure | |
192 | * @owner: pointer to the module that is to "own" this struct class | |
193 | * @name: pointer to a string for the name of this class. | |
194 | * | |
195 | * This is used to create a struct class pointer that can then be used | |
196 | * in calls to class_device_create(). | |
197 | * | |
198 | * Note, the pointer created here is to be destroyed when finished by | |
199 | * making a call to class_destroy(). | |
200 | */ | |
ab7d7371 | 201 | struct class *class_create(struct module *owner, const char *name) |
e9ba6365 | 202 | { |
203 | struct class *cls; | |
204 | int retval; | |
205 | ||
4aed0644 | 206 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
e9ba6365 | 207 | if (!cls) { |
208 | retval = -ENOMEM; | |
209 | goto error; | |
210 | } | |
e9ba6365 | 211 | |
212 | cls->name = name; | |
213 | cls->owner = owner; | |
214 | cls->class_release = class_create_release; | |
215 | cls->release = class_device_create_release; | |
216 | ||
217 | retval = class_register(cls); | |
218 | if (retval) | |
219 | goto error; | |
220 | ||
221 | return cls; | |
222 | ||
223 | error: | |
224 | kfree(cls); | |
225 | return ERR_PTR(retval); | |
226 | } | |
227 | ||
2fc68447 | 228 | /** |
229 | * class_destroy - destroys a struct class structure | |
92a0f861 | 230 | * @cls: pointer to the struct class that is to be destroyed |
2fc68447 | 231 | * |
232 | * Note, the pointer to be destroyed must have been created with a call | |
233 | * to class_create(). | |
234 | */ | |
e9ba6365 | 235 | void class_destroy(struct class *cls) |
236 | { | |
237 | if ((cls == NULL) || (IS_ERR(cls))) | |
238 | return; | |
239 | ||
240 | class_unregister(cls); | |
241 | } | |
1da177e4 LT |
242 | |
243 | /* Class Device Stuff */ | |
244 | ||
245 | int class_device_create_file(struct class_device * class_dev, | |
246 | const struct class_device_attribute * attr) | |
247 | { | |
248 | int error = -EINVAL; | |
249 | if (class_dev) | |
250 | error = sysfs_create_file(&class_dev->kobj, &attr->attr); | |
251 | return error; | |
252 | } | |
253 | ||
254 | void class_device_remove_file(struct class_device * class_dev, | |
255 | const struct class_device_attribute * attr) | |
256 | { | |
257 | if (class_dev) | |
258 | sysfs_remove_file(&class_dev->kobj, &attr->attr); | |
259 | } | |
260 | ||
d919fd43 GKH |
261 | int class_device_create_bin_file(struct class_device *class_dev, |
262 | struct bin_attribute *attr) | |
263 | { | |
264 | int error = -EINVAL; | |
265 | if (class_dev) | |
266 | error = sysfs_create_bin_file(&class_dev->kobj, attr); | |
267 | return error; | |
268 | } | |
269 | ||
270 | void class_device_remove_bin_file(struct class_device *class_dev, | |
271 | struct bin_attribute *attr) | |
272 | { | |
273 | if (class_dev) | |
274 | sysfs_remove_bin_file(&class_dev->kobj, attr); | |
275 | } | |
276 | ||
1da177e4 LT |
277 | static ssize_t |
278 | class_device_attr_show(struct kobject * kobj, struct attribute * attr, | |
279 | char * buf) | |
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->show) | |
286 | ret = class_dev_attr->show(cd, buf); | |
287 | return ret; | |
288 | } | |
289 | ||
290 | static ssize_t | |
291 | class_device_attr_store(struct kobject * kobj, struct attribute * attr, | |
292 | const char * buf, size_t count) | |
293 | { | |
294 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
295 | struct class_device * cd = to_class_dev(kobj); | |
296 | ssize_t ret = 0; | |
297 | ||
298 | if (class_dev_attr->store) | |
299 | ret = class_dev_attr->store(cd, buf, count); | |
300 | return ret; | |
301 | } | |
302 | ||
303 | static struct sysfs_ops class_dev_sysfs_ops = { | |
304 | .show = class_device_attr_show, | |
305 | .store = class_device_attr_store, | |
306 | }; | |
307 | ||
308 | static void class_dev_release(struct kobject * kobj) | |
309 | { | |
310 | struct class_device *cd = to_class_dev(kobj); | |
311 | struct class * cls = cd->class; | |
312 | ||
313 | pr_debug("device class '%s': release.\n", cd->class_id); | |
314 | ||
51d172d5 GKH |
315 | if (cd->release) |
316 | cd->release(cd); | |
317 | else if (cls->release) | |
1da177e4 LT |
318 | cls->release(cd); |
319 | else { | |
51d172d5 | 320 | printk(KERN_ERR "Class Device '%s' does not have a release() function, " |
1da177e4 LT |
321 | "it is broken and must be fixed.\n", |
322 | cd->class_id); | |
323 | WARN_ON(1); | |
324 | } | |
325 | } | |
326 | ||
adc56808 | 327 | static struct kobj_type class_device_ktype = { |
1da177e4 LT |
328 | .sysfs_ops = &class_dev_sysfs_ops, |
329 | .release = class_dev_release, | |
330 | }; | |
331 | ||
312c004d | 332 | static int class_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
333 | { |
334 | struct kobj_type *ktype = get_ktype(kobj); | |
335 | ||
adc56808 | 336 | if (ktype == &class_device_ktype) { |
1da177e4 LT |
337 | struct class_device *class_dev = to_class_dev(kobj); |
338 | if (class_dev->class) | |
339 | return 1; | |
340 | } | |
341 | return 0; | |
342 | } | |
343 | ||
312c004d | 344 | static const char *class_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
345 | { |
346 | struct class_device *class_dev = to_class_dev(kobj); | |
347 | ||
348 | return class_dev->class->name; | |
349 | } | |
350 | ||
805fab47 KS |
351 | #ifdef CONFIG_SYSFS_DEPRECATED |
352 | char *make_class_name(const char *name, struct kobject *kobj) | |
353 | { | |
354 | char *class_name; | |
355 | int size; | |
356 | ||
357 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; | |
358 | ||
359 | class_name = kmalloc(size, GFP_KERNEL); | |
360 | if (!class_name) | |
cb360bbf | 361 | return NULL; |
805fab47 KS |
362 | |
363 | strcpy(class_name, name); | |
364 | strcat(class_name, ":"); | |
365 | strcat(class_name, kobject_name(kobj)); | |
366 | return class_name; | |
367 | } | |
368 | ||
805fab47 KS |
369 | static int make_deprecated_class_device_links(struct class_device *class_dev) |
370 | { | |
371 | char *class_name; | |
372 | int error; | |
373 | ||
374 | if (!class_dev->dev) | |
375 | return 0; | |
376 | ||
377 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
378 | if (class_name) |
379 | error = sysfs_create_link(&class_dev->dev->kobj, | |
380 | &class_dev->kobj, class_name); | |
381 | else | |
382 | error = -ENOMEM; | |
805fab47 KS |
383 | kfree(class_name); |
384 | return error; | |
385 | } | |
386 | ||
387 | static void remove_deprecated_class_device_links(struct class_device *class_dev) | |
388 | { | |
389 | char *class_name; | |
390 | ||
391 | if (!class_dev->dev) | |
392 | return; | |
393 | ||
394 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
395 | if (class_name) |
396 | sysfs_remove_link(&class_dev->dev->kobj, class_name); | |
805fab47 KS |
397 | kfree(class_name); |
398 | } | |
399 | #else | |
805fab47 KS |
400 | static inline int make_deprecated_class_device_links(struct class_device *cd) |
401 | { return 0; } | |
402 | static void remove_deprecated_class_device_links(struct class_device *cd) | |
403 | { } | |
404 | #endif | |
405 | ||
7eff2e7a KS |
406 | static int class_uevent(struct kset *kset, struct kobject *kobj, |
407 | struct kobj_uevent_env *env) | |
1da177e4 LT |
408 | { |
409 | struct class_device *class_dev = to_class_dev(kobj); | |
2c7afd12 | 410 | struct device *dev = class_dev->dev; |
1da177e4 LT |
411 | int retval = 0; |
412 | ||
413 | pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); | |
414 | ||
1da177e4 | 415 | if (MAJOR(class_dev->devt)) { |
7eff2e7a | 416 | add_uevent_var(env, "MAJOR=%u", MAJOR(class_dev->devt)); |
1da177e4 | 417 | |
7eff2e7a | 418 | add_uevent_var(env, "MINOR=%u", MINOR(class_dev->devt)); |
1da177e4 LT |
419 | } |
420 | ||
2c7afd12 KS |
421 | if (dev) { |
422 | const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL); | |
423 | if (path) { | |
7eff2e7a | 424 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
425 | kfree(path); |
426 | } | |
427 | ||
428 | if (dev->bus) | |
7eff2e7a | 429 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
2c7afd12 KS |
430 | |
431 | if (dev->driver) | |
7eff2e7a | 432 | add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); |
2c7afd12 KS |
433 | } |
434 | ||
312c004d | 435 | if (class_dev->uevent) { |
51d172d5 | 436 | /* have the class device specific function add its stuff */ |
7eff2e7a | 437 | retval = class_dev->uevent(class_dev, env); |
51d172d5 | 438 | if (retval) |
312c004d KS |
439 | pr_debug("class_dev->uevent() returned %d\n", retval); |
440 | } else if (class_dev->class->uevent) { | |
51d172d5 | 441 | /* have the class specific function add its stuff */ |
7eff2e7a | 442 | retval = class_dev->class->uevent(class_dev, env); |
51d172d5 | 443 | if (retval) |
312c004d | 444 | pr_debug("class->uevent() returned %d\n", retval); |
1da177e4 LT |
445 | } |
446 | ||
447 | return retval; | |
448 | } | |
449 | ||
312c004d KS |
450 | static struct kset_uevent_ops class_uevent_ops = { |
451 | .filter = class_uevent_filter, | |
452 | .name = class_uevent_name, | |
453 | .uevent = class_uevent, | |
1da177e4 LT |
454 | }; |
455 | ||
3514faca | 456 | static decl_subsys(class_obj, &class_uevent_ops); |
1da177e4 LT |
457 | |
458 | ||
459 | static int class_device_add_attrs(struct class_device * cd) | |
460 | { | |
461 | int i; | |
462 | int error = 0; | |
463 | struct class * cls = cd->class; | |
464 | ||
465 | if (cls->class_dev_attrs) { | |
466 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { | |
467 | error = class_device_create_file(cd, | |
468 | &cls->class_dev_attrs[i]); | |
469 | if (error) | |
470 | goto Err; | |
471 | } | |
472 | } | |
473 | Done: | |
474 | return error; | |
475 | Err: | |
476 | while (--i >= 0) | |
477 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
478 | goto Done; | |
479 | } | |
480 | ||
481 | static void class_device_remove_attrs(struct class_device * cd) | |
482 | { | |
483 | int i; | |
484 | struct class * cls = cd->class; | |
485 | ||
486 | if (cls->class_dev_attrs) { | |
487 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) | |
488 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
489 | } | |
490 | } | |
491 | ||
1498221d SH |
492 | static int class_device_add_groups(struct class_device * cd) |
493 | { | |
494 | int i; | |
495 | int error = 0; | |
496 | ||
497 | if (cd->groups) { | |
498 | for (i = 0; cd->groups[i]; i++) { | |
499 | error = sysfs_create_group(&cd->kobj, cd->groups[i]); | |
500 | if (error) { | |
501 | while (--i >= 0) | |
502 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
503 | goto out; | |
504 | } | |
505 | } | |
506 | } | |
507 | out: | |
508 | return error; | |
509 | } | |
510 | ||
511 | static void class_device_remove_groups(struct class_device * cd) | |
512 | { | |
513 | int i; | |
514 | if (cd->groups) { | |
515 | for (i = 0; cd->groups[i]; i++) { | |
516 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
517 | } | |
518 | } | |
519 | } | |
520 | ||
1da177e4 LT |
521 | static ssize_t show_dev(struct class_device *class_dev, char *buf) |
522 | { | |
523 | return print_dev_t(buf, class_dev->devt); | |
524 | } | |
1da177e4 | 525 | |
ad6a1e1c TH |
526 | static struct class_device_attribute class_devt_attr = |
527 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
528 | ||
a7fd6706 KS |
529 | static ssize_t store_uevent(struct class_device *class_dev, |
530 | const char *buf, size_t count) | |
531 | { | |
312c004d | 532 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
533 | return count; |
534 | } | |
535 | ||
ad6a1e1c TH |
536 | static struct class_device_attribute class_uevent_attr = |
537 | __ATTR(uevent, S_IWUSR, NULL, store_uevent); | |
538 | ||
1da177e4 LT |
539 | void class_device_initialize(struct class_device *class_dev) |
540 | { | |
3514faca GKH |
541 | class_dev->kobj.kset = &class_obj_subsys; |
542 | class_dev->kobj.ktype = &class_device_ktype; | |
1da177e4 LT |
543 | kobject_init(&class_dev->kobj); |
544 | INIT_LIST_HEAD(&class_dev->node); | |
545 | } | |
546 | ||
547 | int class_device_add(struct class_device *class_dev) | |
548 | { | |
51d172d5 GKH |
549 | struct class *parent_class = NULL; |
550 | struct class_device *parent_class_dev = NULL; | |
551 | struct class_interface *class_intf; | |
51d172d5 | 552 | int error = -EINVAL; |
1da177e4 LT |
553 | |
554 | class_dev = class_device_get(class_dev); | |
555 | if (!class_dev) | |
556 | return -EINVAL; | |
557 | ||
51d172d5 | 558 | if (!strlen(class_dev->class_id)) |
b7fe4a60 | 559 | goto out1; |
1da177e4 | 560 | |
51d172d5 GKH |
561 | parent_class = class_get(class_dev->class); |
562 | if (!parent_class) | |
b7fe4a60 SH |
563 | goto out1; |
564 | ||
51d172d5 | 565 | parent_class_dev = class_device_get(class_dev->parent); |
1da177e4 LT |
566 | |
567 | pr_debug("CLASS: registering class device: ID = '%s'\n", | |
568 | class_dev->class_id); | |
569 | ||
570 | /* first, register with generic layer. */ | |
b7fe4a60 SH |
571 | error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id); |
572 | if (error) | |
573 | goto out2; | |
574 | ||
51d172d5 GKH |
575 | if (parent_class_dev) |
576 | class_dev->kobj.parent = &parent_class_dev->kobj; | |
577 | else | |
823bccfc | 578 | class_dev->kobj.parent = &parent_class->subsys.kobj; |
1da177e4 | 579 | |
51d172d5 GKH |
580 | error = kobject_add(&class_dev->kobj); |
581 | if (error) | |
b7fe4a60 | 582 | goto out2; |
1da177e4 | 583 | |
e9ba6365 | 584 | /* add the needed attributes to this device */ |
f0e1761a | 585 | error = sysfs_create_link(&class_dev->kobj, |
823bccfc | 586 | &parent_class->subsys.kobj, "subsystem"); |
f0e1761a CH |
587 | if (error) |
588 | goto out3; | |
ad6a1e1c TH |
589 | |
590 | error = class_device_create_file(class_dev, &class_uevent_attr); | |
b7fe4a60 SH |
591 | if (error) |
592 | goto out3; | |
a7fd6706 | 593 | |
e9ba6365 | 594 | if (MAJOR(class_dev->devt)) { |
ad6a1e1c TH |
595 | error = class_device_create_file(class_dev, &class_devt_attr); |
596 | if (error) | |
b7fe4a60 | 597 | goto out4; |
e9ba6365 | 598 | } |
599 | ||
b7fe4a60 SH |
600 | error = class_device_add_attrs(class_dev); |
601 | if (error) | |
602 | goto out5; | |
603 | ||
76d1ce00 | 604 | if (class_dev->dev) { |
b7fe4a60 SH |
605 | error = sysfs_create_link(&class_dev->kobj, |
606 | &class_dev->dev->kobj, "device"); | |
607 | if (error) | |
608 | goto out6; | |
76d1ce00 | 609 | } |
e9ba6365 | 610 | |
b7fe4a60 | 611 | error = class_device_add_groups(class_dev); |
805fab47 KS |
612 | if (error) |
613 | goto out7; | |
614 | ||
615 | error = make_deprecated_class_device_links(class_dev); | |
b7fe4a60 SH |
616 | if (error) |
617 | goto out8; | |
1498221d | 618 | |
312c004d | 619 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
dbe9035d | 620 | |
e9ba6365 | 621 | /* notify any interfaces this device is now here */ |
a1438890 J |
622 | down(&parent_class->sem); |
623 | list_add_tail(&class_dev->node, &parent_class->children); | |
624 | list_for_each_entry(class_intf, &parent_class->interfaces, node) { | |
625 | if (class_intf->add) | |
626 | class_intf->add(class_dev, class_intf); | |
1da177e4 | 627 | } |
a1438890 | 628 | up(&parent_class->sem); |
e9ba6365 | 629 | |
b7fe4a60 SH |
630 | goto out1; |
631 | ||
632 | out8: | |
805fab47 | 633 | class_device_remove_groups(class_dev); |
b7fe4a60 SH |
634 | out7: |
635 | if (class_dev->dev) | |
636 | sysfs_remove_link(&class_dev->kobj, "device"); | |
637 | out6: | |
638 | class_device_remove_attrs(class_dev); | |
639 | out5: | |
ad6a1e1c TH |
640 | if (MAJOR(class_dev->devt)) |
641 | class_device_remove_file(class_dev, &class_devt_attr); | |
b7fe4a60 | 642 | out4: |
ad6a1e1c | 643 | class_device_remove_file(class_dev, &class_uevent_attr); |
b7fe4a60 SH |
644 | out3: |
645 | kobject_del(&class_dev->kobj); | |
646 | out2: | |
647 | if(parent_class_dev) | |
51d172d5 | 648 | class_device_put(parent_class_dev); |
b7fe4a60 SH |
649 | class_put(parent_class); |
650 | out1: | |
1da177e4 LT |
651 | class_device_put(class_dev); |
652 | return error; | |
653 | } | |
654 | ||
655 | int class_device_register(struct class_device *class_dev) | |
656 | { | |
657 | class_device_initialize(class_dev); | |
658 | return class_device_add(class_dev); | |
659 | } | |
660 | ||
2fc68447 | 661 | /** |
662 | * class_device_create - creates a class device and registers it with sysfs | |
92a0f861 | 663 | * @cls: pointer to the struct class that this device should be registered to. |
51d172d5 | 664 | * @parent: pointer to the parent struct class_device of this new device, if any. |
92a0f861 | 665 | * @devt: the dev_t for the char device to be added. |
2fc68447 | 666 | * @device: a pointer to a struct device that is assiociated with this class device. |
667 | * @fmt: string for the class device's name | |
668 | * | |
669 | * This function can be used by char device classes. A struct | |
670 | * class_device will be created in sysfs, registered to the specified | |
51d172d5 GKH |
671 | * class. |
672 | * A "dev" file will be created, showing the dev_t for the device, if | |
673 | * the dev_t is not 0,0. | |
674 | * If a pointer to a parent struct class_device is passed in, the newly | |
675 | * created struct class_device will be a child of that device in sysfs. | |
676 | * The pointer to the struct class_device will be returned from the | |
677 | * call. Any further sysfs files that might be required can be created | |
678 | * using this pointer. | |
2fc68447 | 679 | * |
680 | * Note: the struct class passed to this function must have previously | |
681 | * been created with a call to class_create(). | |
682 | */ | |
51d172d5 GKH |
683 | struct class_device *class_device_create(struct class *cls, |
684 | struct class_device *parent, | |
685 | dev_t devt, | |
ddd5d35a DT |
686 | struct device *device, |
687 | const char *fmt, ...) | |
e9ba6365 | 688 | { |
689 | va_list args; | |
690 | struct class_device *class_dev = NULL; | |
691 | int retval = -ENODEV; | |
692 | ||
693 | if (cls == NULL || IS_ERR(cls)) | |
694 | goto error; | |
695 | ||
4aed0644 | 696 | class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL); |
e9ba6365 | 697 | if (!class_dev) { |
698 | retval = -ENOMEM; | |
699 | goto error; | |
700 | } | |
e9ba6365 | 701 | |
702 | class_dev->devt = devt; | |
703 | class_dev->dev = device; | |
704 | class_dev->class = cls; | |
51d172d5 GKH |
705 | class_dev->parent = parent; |
706 | class_dev->release = class_device_create_release; | |
312c004d | 707 | class_dev->uevent = class_device_create_uevent; |
e9ba6365 | 708 | |
709 | va_start(args, fmt); | |
710 | vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args); | |
711 | va_end(args); | |
712 | retval = class_device_register(class_dev); | |
713 | if (retval) | |
714 | goto error; | |
715 | ||
716 | return class_dev; | |
717 | ||
718 | error: | |
719 | kfree(class_dev); | |
720 | return ERR_PTR(retval); | |
721 | } | |
722 | ||
1da177e4 LT |
723 | void class_device_del(struct class_device *class_dev) |
724 | { | |
51d172d5 GKH |
725 | struct class *parent_class = class_dev->class; |
726 | struct class_device *parent_device = class_dev->parent; | |
727 | struct class_interface *class_intf; | |
1da177e4 | 728 | |
51d172d5 GKH |
729 | if (parent_class) { |
730 | down(&parent_class->sem); | |
1da177e4 | 731 | list_del_init(&class_dev->node); |
51d172d5 | 732 | list_for_each_entry(class_intf, &parent_class->interfaces, node) |
1da177e4 | 733 | if (class_intf->remove) |
d8539d81 | 734 | class_intf->remove(class_dev, class_intf); |
51d172d5 | 735 | up(&parent_class->sem); |
1da177e4 LT |
736 | } |
737 | ||
76d1ce00 | 738 | if (class_dev->dev) { |
805fab47 | 739 | remove_deprecated_class_device_links(class_dev); |
1da177e4 | 740 | sysfs_remove_link(&class_dev->kobj, "device"); |
76d1ce00 | 741 | } |
b9d9c82b | 742 | sysfs_remove_link(&class_dev->kobj, "subsystem"); |
ad6a1e1c TH |
743 | class_device_remove_file(class_dev, &class_uevent_attr); |
744 | if (MAJOR(class_dev->devt)) | |
745 | class_device_remove_file(class_dev, &class_devt_attr); | |
1da177e4 | 746 | class_device_remove_attrs(class_dev); |
1498221d | 747 | class_device_remove_groups(class_dev); |
1da177e4 | 748 | |
312c004d | 749 | kobject_uevent(&class_dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
750 | kobject_del(&class_dev->kobj); |
751 | ||
51d172d5 GKH |
752 | class_device_put(parent_device); |
753 | class_put(parent_class); | |
1da177e4 LT |
754 | } |
755 | ||
756 | void class_device_unregister(struct class_device *class_dev) | |
757 | { | |
758 | pr_debug("CLASS: Unregistering class device. ID = '%s'\n", | |
759 | class_dev->class_id); | |
760 | class_device_del(class_dev); | |
761 | class_device_put(class_dev); | |
762 | } | |
763 | ||
2fc68447 | 764 | /** |
765 | * class_device_destroy - removes a class device that was created with class_device_create() | |
766 | * @cls: the pointer to the struct class that this device was registered * with. | |
92a0f861 | 767 | * @devt: the dev_t of the device that was previously registered. |
2fc68447 | 768 | * |
769 | * This call unregisters and cleans up a class device that was created with a | |
770 | * call to class_device_create() | |
771 | */ | |
e9ba6365 | 772 | void class_device_destroy(struct class *cls, dev_t devt) |
773 | { | |
774 | struct class_device *class_dev = NULL; | |
775 | struct class_device *class_dev_tmp; | |
776 | ||
777 | down(&cls->sem); | |
778 | list_for_each_entry(class_dev_tmp, &cls->children, node) { | |
779 | if (class_dev_tmp->devt == devt) { | |
780 | class_dev = class_dev_tmp; | |
781 | break; | |
782 | } | |
783 | } | |
784 | up(&cls->sem); | |
785 | ||
786 | if (class_dev) | |
787 | class_device_unregister(class_dev); | |
788 | } | |
789 | ||
1da177e4 LT |
790 | struct class_device * class_device_get(struct class_device *class_dev) |
791 | { | |
792 | if (class_dev) | |
793 | return to_class_dev(kobject_get(&class_dev->kobj)); | |
794 | return NULL; | |
795 | } | |
796 | ||
797 | void class_device_put(struct class_device *class_dev) | |
798 | { | |
51d172d5 GKH |
799 | if (class_dev) |
800 | kobject_put(&class_dev->kobj); | |
1da177e4 LT |
801 | } |
802 | ||
803 | ||
804 | int class_interface_register(struct class_interface *class_intf) | |
805 | { | |
806 | struct class *parent; | |
807 | struct class_device *class_dev; | |
c47ed219 | 808 | struct device *dev; |
1da177e4 LT |
809 | |
810 | if (!class_intf || !class_intf->class) | |
811 | return -ENODEV; | |
812 | ||
813 | parent = class_get(class_intf->class); | |
814 | if (!parent) | |
815 | return -EINVAL; | |
816 | ||
817 | down(&parent->sem); | |
818 | list_add_tail(&class_intf->node, &parent->interfaces); | |
819 | if (class_intf->add) { | |
820 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 821 | class_intf->add(class_dev, class_intf); |
1da177e4 | 822 | } |
c47ed219 GKH |
823 | if (class_intf->add_dev) { |
824 | list_for_each_entry(dev, &parent->devices, node) | |
825 | class_intf->add_dev(dev, class_intf); | |
826 | } | |
1da177e4 LT |
827 | up(&parent->sem); |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
832 | void class_interface_unregister(struct class_interface *class_intf) | |
833 | { | |
834 | struct class * parent = class_intf->class; | |
835 | struct class_device *class_dev; | |
c47ed219 | 836 | struct device *dev; |
1da177e4 LT |
837 | |
838 | if (!parent) | |
839 | return; | |
840 | ||
841 | down(&parent->sem); | |
842 | list_del_init(&class_intf->node); | |
843 | if (class_intf->remove) { | |
844 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 845 | class_intf->remove(class_dev, class_intf); |
1da177e4 | 846 | } |
c47ed219 GKH |
847 | if (class_intf->remove_dev) { |
848 | list_for_each_entry(dev, &parent->devices, node) | |
849 | class_intf->remove_dev(dev, class_intf); | |
850 | } | |
1da177e4 LT |
851 | up(&parent->sem); |
852 | ||
853 | class_put(parent); | |
854 | } | |
855 | ||
1da177e4 LT |
856 | int __init classes_init(void) |
857 | { | |
858 | int retval; | |
859 | ||
860 | retval = subsystem_register(&class_subsys); | |
861 | if (retval) | |
862 | return retval; | |
863 | ||
864 | /* ick, this is ugly, the things we go through to keep from showing up | |
865 | * in sysfs... */ | |
e4bc1662 | 866 | kset_init(&class_obj_subsys); |
823bccfc GKH |
867 | if (!class_obj_subsys.kobj.parent) |
868 | class_obj_subsys.kobj.parent = &class_obj_subsys.kobj; | |
1da177e4 LT |
869 | return 0; |
870 | } | |
871 | ||
872 | EXPORT_SYMBOL_GPL(class_create_file); | |
873 | EXPORT_SYMBOL_GPL(class_remove_file); | |
874 | EXPORT_SYMBOL_GPL(class_register); | |
875 | EXPORT_SYMBOL_GPL(class_unregister); | |
e9ba6365 | 876 | EXPORT_SYMBOL_GPL(class_create); |
877 | EXPORT_SYMBOL_GPL(class_destroy); | |
1da177e4 LT |
878 | |
879 | EXPORT_SYMBOL_GPL(class_device_register); | |
880 | EXPORT_SYMBOL_GPL(class_device_unregister); | |
881 | EXPORT_SYMBOL_GPL(class_device_initialize); | |
882 | EXPORT_SYMBOL_GPL(class_device_add); | |
883 | EXPORT_SYMBOL_GPL(class_device_del); | |
884 | EXPORT_SYMBOL_GPL(class_device_get); | |
885 | EXPORT_SYMBOL_GPL(class_device_put); | |
e9ba6365 | 886 | EXPORT_SYMBOL_GPL(class_device_create); |
887 | EXPORT_SYMBOL_GPL(class_device_destroy); | |
1da177e4 LT |
888 | EXPORT_SYMBOL_GPL(class_device_create_file); |
889 | EXPORT_SYMBOL_GPL(class_device_remove_file); | |
d919fd43 GKH |
890 | EXPORT_SYMBOL_GPL(class_device_create_bin_file); |
891 | EXPORT_SYMBOL_GPL(class_device_remove_bin_file); | |
1da177e4 LT |
892 | |
893 | EXPORT_SYMBOL_GPL(class_interface_register); | |
894 | EXPORT_SYMBOL_GPL(class_interface_unregister); |