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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 | ||
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 */ | |
adc56808 | 74 | static decl_subsys(class, &class_ktype, 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; |
1da177e4 LT |
153 | |
154 | error = subsystem_register(&cls->subsys); | |
155 | if (!error) { | |
156 | error = add_class_attrs(class_get(cls)); | |
157 | class_put(cls); | |
158 | } | |
159 | return error; | |
160 | } | |
161 | ||
162 | void class_unregister(struct class * cls) | |
163 | { | |
164 | pr_debug("device class '%s': unregistering\n", cls->name); | |
165 | remove_class_attrs(cls); | |
166 | subsystem_unregister(&cls->subsys); | |
167 | } | |
168 | ||
e9ba6365 GKH |
169 | static void class_create_release(struct class *cls) |
170 | { | |
51d172d5 | 171 | pr_debug("%s called for %s\n", __FUNCTION__, cls->name); |
e9ba6365 GKH |
172 | kfree(cls); |
173 | } | |
174 | ||
175 | static void class_device_create_release(struct class_device *class_dev) | |
176 | { | |
51d172d5 | 177 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); |
e9ba6365 GKH |
178 | kfree(class_dev); |
179 | } | |
180 | ||
51d172d5 | 181 | /* needed to allow these devices to have parent class devices */ |
312c004d | 182 | static int class_device_create_uevent(struct class_device *class_dev, |
7eff2e7a | 183 | struct kobj_uevent_env *env) |
51d172d5 GKH |
184 | { |
185 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); | |
186 | return 0; | |
187 | } | |
188 | ||
2fc68447 GKH |
189 | /** |
190 | * class_create - create a struct class structure | |
191 | * @owner: pointer to the module that is to "own" this struct class | |
192 | * @name: pointer to a string for the name of this class. | |
193 | * | |
194 | * This is used to create a struct class pointer that can then be used | |
195 | * in calls to class_device_create(). | |
196 | * | |
197 | * Note, the pointer created here is to be destroyed when finished by | |
198 | * making a call to class_destroy(). | |
199 | */ | |
ab7d7371 | 200 | struct class *class_create(struct module *owner, const char *name) |
e9ba6365 GKH |
201 | { |
202 | struct class *cls; | |
203 | int retval; | |
204 | ||
4aed0644 | 205 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
e9ba6365 GKH |
206 | if (!cls) { |
207 | retval = -ENOMEM; | |
208 | goto error; | |
209 | } | |
e9ba6365 GKH |
210 | |
211 | cls->name = name; | |
212 | cls->owner = owner; | |
213 | cls->class_release = class_create_release; | |
214 | cls->release = class_device_create_release; | |
215 | ||
216 | retval = class_register(cls); | |
217 | if (retval) | |
218 | goto error; | |
219 | ||
220 | return cls; | |
221 | ||
222 | error: | |
223 | kfree(cls); | |
224 | return ERR_PTR(retval); | |
225 | } | |
226 | ||
2fc68447 GKH |
227 | /** |
228 | * class_destroy - destroys a struct class structure | |
92a0f861 | 229 | * @cls: pointer to the struct class that is to be destroyed |
2fc68447 GKH |
230 | * |
231 | * Note, the pointer to be destroyed must have been created with a call | |
232 | * to class_create(). | |
233 | */ | |
e9ba6365 GKH |
234 | void class_destroy(struct class *cls) |
235 | { | |
236 | if ((cls == NULL) || (IS_ERR(cls))) | |
237 | return; | |
238 | ||
239 | class_unregister(cls); | |
240 | } | |
1da177e4 LT |
241 | |
242 | /* Class Device Stuff */ | |
243 | ||
244 | int class_device_create_file(struct class_device * class_dev, | |
245 | const struct class_device_attribute * attr) | |
246 | { | |
247 | int error = -EINVAL; | |
248 | if (class_dev) | |
249 | error = sysfs_create_file(&class_dev->kobj, &attr->attr); | |
250 | return error; | |
251 | } | |
252 | ||
253 | void class_device_remove_file(struct class_device * class_dev, | |
254 | const struct class_device_attribute * attr) | |
255 | { | |
256 | if (class_dev) | |
257 | sysfs_remove_file(&class_dev->kobj, &attr->attr); | |
258 | } | |
259 | ||
d919fd43 GKH |
260 | int class_device_create_bin_file(struct class_device *class_dev, |
261 | struct bin_attribute *attr) | |
262 | { | |
263 | int error = -EINVAL; | |
264 | if (class_dev) | |
265 | error = sysfs_create_bin_file(&class_dev->kobj, attr); | |
266 | return error; | |
267 | } | |
268 | ||
269 | void class_device_remove_bin_file(struct class_device *class_dev, | |
270 | struct bin_attribute *attr) | |
271 | { | |
272 | if (class_dev) | |
273 | sysfs_remove_bin_file(&class_dev->kobj, attr); | |
274 | } | |
275 | ||
1da177e4 LT |
276 | static ssize_t |
277 | class_device_attr_show(struct kobject * kobj, struct attribute * attr, | |
278 | char * buf) | |
279 | { | |
280 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
281 | struct class_device * cd = to_class_dev(kobj); | |
282 | ssize_t ret = 0; | |
283 | ||
284 | if (class_dev_attr->show) | |
285 | ret = class_dev_attr->show(cd, buf); | |
286 | return ret; | |
287 | } | |
288 | ||
289 | static ssize_t | |
290 | class_device_attr_store(struct kobject * kobj, struct attribute * attr, | |
291 | const char * buf, size_t count) | |
292 | { | |
293 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
294 | struct class_device * cd = to_class_dev(kobj); | |
295 | ssize_t ret = 0; | |
296 | ||
297 | if (class_dev_attr->store) | |
298 | ret = class_dev_attr->store(cd, buf, count); | |
299 | return ret; | |
300 | } | |
301 | ||
302 | static struct sysfs_ops class_dev_sysfs_ops = { | |
303 | .show = class_device_attr_show, | |
304 | .store = class_device_attr_store, | |
305 | }; | |
306 | ||
307 | static void class_dev_release(struct kobject * kobj) | |
308 | { | |
309 | struct class_device *cd = to_class_dev(kobj); | |
310 | struct class * cls = cd->class; | |
311 | ||
312 | pr_debug("device class '%s': release.\n", cd->class_id); | |
313 | ||
51d172d5 GKH |
314 | if (cd->release) |
315 | cd->release(cd); | |
316 | else if (cls->release) | |
1da177e4 LT |
317 | cls->release(cd); |
318 | else { | |
51d172d5 | 319 | printk(KERN_ERR "Class Device '%s' does not have a release() function, " |
1da177e4 LT |
320 | "it is broken and must be fixed.\n", |
321 | cd->class_id); | |
322 | WARN_ON(1); | |
323 | } | |
324 | } | |
325 | ||
adc56808 | 326 | static struct kobj_type class_device_ktype = { |
1da177e4 LT |
327 | .sysfs_ops = &class_dev_sysfs_ops, |
328 | .release = class_dev_release, | |
329 | }; | |
330 | ||
312c004d | 331 | static int class_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
332 | { |
333 | struct kobj_type *ktype = get_ktype(kobj); | |
334 | ||
adc56808 | 335 | if (ktype == &class_device_ktype) { |
1da177e4 LT |
336 | struct class_device *class_dev = to_class_dev(kobj); |
337 | if (class_dev->class) | |
338 | return 1; | |
339 | } | |
340 | return 0; | |
341 | } | |
342 | ||
312c004d | 343 | static const char *class_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
344 | { |
345 | struct class_device *class_dev = to_class_dev(kobj); | |
346 | ||
347 | return class_dev->class->name; | |
348 | } | |
349 | ||
805fab47 KS |
350 | #ifdef CONFIG_SYSFS_DEPRECATED |
351 | char *make_class_name(const char *name, struct kobject *kobj) | |
352 | { | |
353 | char *class_name; | |
354 | int size; | |
355 | ||
356 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; | |
357 | ||
358 | class_name = kmalloc(size, GFP_KERNEL); | |
359 | if (!class_name) | |
cb360bbf | 360 | return NULL; |
805fab47 KS |
361 | |
362 | strcpy(class_name, name); | |
363 | strcat(class_name, ":"); | |
364 | strcat(class_name, kobject_name(kobj)); | |
365 | return class_name; | |
366 | } | |
367 | ||
805fab47 KS |
368 | static int make_deprecated_class_device_links(struct class_device *class_dev) |
369 | { | |
370 | char *class_name; | |
371 | int error; | |
372 | ||
373 | if (!class_dev->dev) | |
374 | return 0; | |
375 | ||
376 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
377 | if (class_name) |
378 | error = sysfs_create_link(&class_dev->dev->kobj, | |
379 | &class_dev->kobj, class_name); | |
380 | else | |
381 | error = -ENOMEM; | |
805fab47 KS |
382 | kfree(class_name); |
383 | return error; | |
384 | } | |
385 | ||
386 | static void remove_deprecated_class_device_links(struct class_device *class_dev) | |
387 | { | |
388 | char *class_name; | |
389 | ||
390 | if (!class_dev->dev) | |
391 | return; | |
392 | ||
393 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
394 | if (class_name) |
395 | sysfs_remove_link(&class_dev->dev->kobj, class_name); | |
805fab47 KS |
396 | kfree(class_name); |
397 | } | |
398 | #else | |
805fab47 KS |
399 | static inline int make_deprecated_class_device_links(struct class_device *cd) |
400 | { return 0; } | |
401 | static void remove_deprecated_class_device_links(struct class_device *cd) | |
402 | { } | |
403 | #endif | |
404 | ||
7eff2e7a KS |
405 | static int class_uevent(struct kset *kset, struct kobject *kobj, |
406 | struct kobj_uevent_env *env) | |
1da177e4 LT |
407 | { |
408 | struct class_device *class_dev = to_class_dev(kobj); | |
2c7afd12 | 409 | struct device *dev = class_dev->dev; |
1da177e4 LT |
410 | int retval = 0; |
411 | ||
412 | pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); | |
413 | ||
1da177e4 | 414 | if (MAJOR(class_dev->devt)) { |
7eff2e7a | 415 | add_uevent_var(env, "MAJOR=%u", MAJOR(class_dev->devt)); |
1da177e4 | 416 | |
7eff2e7a | 417 | add_uevent_var(env, "MINOR=%u", MINOR(class_dev->devt)); |
1da177e4 LT |
418 | } |
419 | ||
2c7afd12 KS |
420 | if (dev) { |
421 | const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL); | |
422 | if (path) { | |
7eff2e7a | 423 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
424 | kfree(path); |
425 | } | |
426 | ||
427 | if (dev->bus) | |
7eff2e7a | 428 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
2c7afd12 KS |
429 | |
430 | if (dev->driver) | |
7eff2e7a | 431 | add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); |
2c7afd12 KS |
432 | } |
433 | ||
312c004d | 434 | if (class_dev->uevent) { |
51d172d5 | 435 | /* have the class device specific function add its stuff */ |
7eff2e7a | 436 | retval = class_dev->uevent(class_dev, env); |
51d172d5 | 437 | if (retval) |
312c004d KS |
438 | pr_debug("class_dev->uevent() returned %d\n", retval); |
439 | } else if (class_dev->class->uevent) { | |
51d172d5 | 440 | /* have the class specific function add its stuff */ |
7eff2e7a | 441 | retval = class_dev->class->uevent(class_dev, env); |
51d172d5 | 442 | if (retval) |
312c004d | 443 | pr_debug("class->uevent() returned %d\n", retval); |
1da177e4 LT |
444 | } |
445 | ||
446 | return retval; | |
447 | } | |
448 | ||
312c004d KS |
449 | static struct kset_uevent_ops class_uevent_ops = { |
450 | .filter = class_uevent_filter, | |
451 | .name = class_uevent_name, | |
452 | .uevent = class_uevent, | |
1da177e4 LT |
453 | }; |
454 | ||
adc56808 | 455 | static decl_subsys(class_obj, &class_device_ktype, &class_uevent_ops); |
1da177e4 LT |
456 | |
457 | ||
458 | static int class_device_add_attrs(struct class_device * cd) | |
459 | { | |
460 | int i; | |
461 | int error = 0; | |
462 | struct class * cls = cd->class; | |
463 | ||
464 | if (cls->class_dev_attrs) { | |
465 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { | |
466 | error = class_device_create_file(cd, | |
467 | &cls->class_dev_attrs[i]); | |
468 | if (error) | |
469 | goto Err; | |
470 | } | |
471 | } | |
472 | Done: | |
473 | return error; | |
474 | Err: | |
475 | while (--i >= 0) | |
476 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
477 | goto Done; | |
478 | } | |
479 | ||
480 | static void class_device_remove_attrs(struct class_device * cd) | |
481 | { | |
482 | int i; | |
483 | struct class * cls = cd->class; | |
484 | ||
485 | if (cls->class_dev_attrs) { | |
486 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) | |
487 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
488 | } | |
489 | } | |
490 | ||
1498221d SH |
491 | static int class_device_add_groups(struct class_device * cd) |
492 | { | |
493 | int i; | |
494 | int error = 0; | |
495 | ||
496 | if (cd->groups) { | |
497 | for (i = 0; cd->groups[i]; i++) { | |
498 | error = sysfs_create_group(&cd->kobj, cd->groups[i]); | |
499 | if (error) { | |
500 | while (--i >= 0) | |
501 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
502 | goto out; | |
503 | } | |
504 | } | |
505 | } | |
506 | out: | |
507 | return error; | |
508 | } | |
509 | ||
510 | static void class_device_remove_groups(struct class_device * cd) | |
511 | { | |
512 | int i; | |
513 | if (cd->groups) { | |
514 | for (i = 0; cd->groups[i]; i++) { | |
515 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
516 | } | |
517 | } | |
518 | } | |
519 | ||
1da177e4 LT |
520 | static ssize_t show_dev(struct class_device *class_dev, char *buf) |
521 | { | |
522 | return print_dev_t(buf, class_dev->devt); | |
523 | } | |
1da177e4 | 524 | |
ad6a1e1c TH |
525 | static struct class_device_attribute class_devt_attr = |
526 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
527 | ||
a7fd6706 KS |
528 | static ssize_t store_uevent(struct class_device *class_dev, |
529 | const char *buf, size_t count) | |
530 | { | |
312c004d | 531 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
532 | return count; |
533 | } | |
534 | ||
ad6a1e1c TH |
535 | static struct class_device_attribute class_uevent_attr = |
536 | __ATTR(uevent, S_IWUSR, NULL, store_uevent); | |
537 | ||
1da177e4 LT |
538 | void class_device_initialize(struct class_device *class_dev) |
539 | { | |
540 | kobj_set_kset_s(class_dev, class_obj_subsys); | |
541 | kobject_init(&class_dev->kobj); | |
542 | INIT_LIST_HEAD(&class_dev->node); | |
543 | } | |
544 | ||
545 | int class_device_add(struct class_device *class_dev) | |
546 | { | |
51d172d5 GKH |
547 | struct class *parent_class = NULL; |
548 | struct class_device *parent_class_dev = NULL; | |
549 | struct class_interface *class_intf; | |
51d172d5 | 550 | int error = -EINVAL; |
1da177e4 LT |
551 | |
552 | class_dev = class_device_get(class_dev); | |
553 | if (!class_dev) | |
554 | return -EINVAL; | |
555 | ||
51d172d5 | 556 | if (!strlen(class_dev->class_id)) |
b7fe4a60 | 557 | goto out1; |
1da177e4 | 558 | |
51d172d5 GKH |
559 | parent_class = class_get(class_dev->class); |
560 | if (!parent_class) | |
b7fe4a60 SH |
561 | goto out1; |
562 | ||
51d172d5 | 563 | parent_class_dev = class_device_get(class_dev->parent); |
1da177e4 LT |
564 | |
565 | pr_debug("CLASS: registering class device: ID = '%s'\n", | |
566 | class_dev->class_id); | |
567 | ||
568 | /* first, register with generic layer. */ | |
b7fe4a60 SH |
569 | error = kobject_set_name(&class_dev->kobj, "%s", class_dev->class_id); |
570 | if (error) | |
571 | goto out2; | |
572 | ||
51d172d5 GKH |
573 | if (parent_class_dev) |
574 | class_dev->kobj.parent = &parent_class_dev->kobj; | |
575 | else | |
823bccfc | 576 | class_dev->kobj.parent = &parent_class->subsys.kobj; |
1da177e4 | 577 | |
51d172d5 GKH |
578 | error = kobject_add(&class_dev->kobj); |
579 | if (error) | |
b7fe4a60 | 580 | goto out2; |
1da177e4 | 581 | |
e9ba6365 | 582 | /* add the needed attributes to this device */ |
f0e1761a | 583 | error = sysfs_create_link(&class_dev->kobj, |
823bccfc | 584 | &parent_class->subsys.kobj, "subsystem"); |
f0e1761a CH |
585 | if (error) |
586 | goto out3; | |
ad6a1e1c TH |
587 | |
588 | error = class_device_create_file(class_dev, &class_uevent_attr); | |
b7fe4a60 SH |
589 | if (error) |
590 | goto out3; | |
a7fd6706 | 591 | |
e9ba6365 | 592 | if (MAJOR(class_dev->devt)) { |
ad6a1e1c TH |
593 | error = class_device_create_file(class_dev, &class_devt_attr); |
594 | if (error) | |
b7fe4a60 | 595 | goto out4; |
e9ba6365 GKH |
596 | } |
597 | ||
b7fe4a60 SH |
598 | error = class_device_add_attrs(class_dev); |
599 | if (error) | |
600 | goto out5; | |
601 | ||
76d1ce00 | 602 | if (class_dev->dev) { |
b7fe4a60 SH |
603 | error = sysfs_create_link(&class_dev->kobj, |
604 | &class_dev->dev->kobj, "device"); | |
605 | if (error) | |
606 | goto out6; | |
76d1ce00 | 607 | } |
e9ba6365 | 608 | |
b7fe4a60 | 609 | error = class_device_add_groups(class_dev); |
805fab47 KS |
610 | if (error) |
611 | goto out7; | |
612 | ||
613 | error = make_deprecated_class_device_links(class_dev); | |
b7fe4a60 SH |
614 | if (error) |
615 | goto out8; | |
1498221d | 616 | |
312c004d | 617 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
dbe9035d | 618 | |
e9ba6365 | 619 | /* notify any interfaces this device is now here */ |
a1438890 J |
620 | down(&parent_class->sem); |
621 | list_add_tail(&class_dev->node, &parent_class->children); | |
622 | list_for_each_entry(class_intf, &parent_class->interfaces, node) { | |
623 | if (class_intf->add) | |
624 | class_intf->add(class_dev, class_intf); | |
1da177e4 | 625 | } |
a1438890 | 626 | up(&parent_class->sem); |
e9ba6365 | 627 | |
b7fe4a60 SH |
628 | goto out1; |
629 | ||
630 | out8: | |
805fab47 | 631 | class_device_remove_groups(class_dev); |
b7fe4a60 SH |
632 | out7: |
633 | if (class_dev->dev) | |
634 | sysfs_remove_link(&class_dev->kobj, "device"); | |
635 | out6: | |
636 | class_device_remove_attrs(class_dev); | |
637 | out5: | |
ad6a1e1c TH |
638 | if (MAJOR(class_dev->devt)) |
639 | class_device_remove_file(class_dev, &class_devt_attr); | |
b7fe4a60 | 640 | out4: |
ad6a1e1c | 641 | class_device_remove_file(class_dev, &class_uevent_attr); |
b7fe4a60 SH |
642 | out3: |
643 | kobject_del(&class_dev->kobj); | |
644 | out2: | |
645 | if(parent_class_dev) | |
51d172d5 | 646 | class_device_put(parent_class_dev); |
b7fe4a60 SH |
647 | class_put(parent_class); |
648 | out1: | |
1da177e4 LT |
649 | class_device_put(class_dev); |
650 | return error; | |
651 | } | |
652 | ||
653 | int class_device_register(struct class_device *class_dev) | |
654 | { | |
655 | class_device_initialize(class_dev); | |
656 | return class_device_add(class_dev); | |
657 | } | |
658 | ||
2fc68447 GKH |
659 | /** |
660 | * class_device_create - creates a class device and registers it with sysfs | |
92a0f861 | 661 | * @cls: pointer to the struct class that this device should be registered to. |
51d172d5 | 662 | * @parent: pointer to the parent struct class_device of this new device, if any. |
92a0f861 | 663 | * @devt: the dev_t for the char device to be added. |
2fc68447 GKH |
664 | * @device: a pointer to a struct device that is assiociated with this class device. |
665 | * @fmt: string for the class device's name | |
666 | * | |
667 | * This function can be used by char device classes. A struct | |
668 | * class_device will be created in sysfs, registered to the specified | |
51d172d5 GKH |
669 | * class. |
670 | * A "dev" file will be created, showing the dev_t for the device, if | |
671 | * the dev_t is not 0,0. | |
672 | * If a pointer to a parent struct class_device is passed in, the newly | |
673 | * created struct class_device will be a child of that device in sysfs. | |
674 | * The pointer to the struct class_device will be returned from the | |
675 | * call. Any further sysfs files that might be required can be created | |
676 | * using this pointer. | |
2fc68447 GKH |
677 | * |
678 | * Note: the struct class passed to this function must have previously | |
679 | * been created with a call to class_create(). | |
680 | */ | |
51d172d5 GKH |
681 | struct class_device *class_device_create(struct class *cls, |
682 | struct class_device *parent, | |
683 | dev_t devt, | |
ddd5d35a DT |
684 | struct device *device, |
685 | const char *fmt, ...) | |
e9ba6365 GKH |
686 | { |
687 | va_list args; | |
688 | struct class_device *class_dev = NULL; | |
689 | int retval = -ENODEV; | |
690 | ||
691 | if (cls == NULL || IS_ERR(cls)) | |
692 | goto error; | |
693 | ||
4aed0644 | 694 | class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL); |
e9ba6365 GKH |
695 | if (!class_dev) { |
696 | retval = -ENOMEM; | |
697 | goto error; | |
698 | } | |
e9ba6365 GKH |
699 | |
700 | class_dev->devt = devt; | |
701 | class_dev->dev = device; | |
702 | class_dev->class = cls; | |
51d172d5 GKH |
703 | class_dev->parent = parent; |
704 | class_dev->release = class_device_create_release; | |
312c004d | 705 | class_dev->uevent = class_device_create_uevent; |
e9ba6365 GKH |
706 | |
707 | va_start(args, fmt); | |
708 | vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args); | |
709 | va_end(args); | |
710 | retval = class_device_register(class_dev); | |
711 | if (retval) | |
712 | goto error; | |
713 | ||
714 | return class_dev; | |
715 | ||
716 | error: | |
717 | kfree(class_dev); | |
718 | return ERR_PTR(retval); | |
719 | } | |
720 | ||
1da177e4 LT |
721 | void class_device_del(struct class_device *class_dev) |
722 | { | |
51d172d5 GKH |
723 | struct class *parent_class = class_dev->class; |
724 | struct class_device *parent_device = class_dev->parent; | |
725 | struct class_interface *class_intf; | |
1da177e4 | 726 | |
51d172d5 GKH |
727 | if (parent_class) { |
728 | down(&parent_class->sem); | |
1da177e4 | 729 | list_del_init(&class_dev->node); |
51d172d5 | 730 | list_for_each_entry(class_intf, &parent_class->interfaces, node) |
1da177e4 | 731 | if (class_intf->remove) |
d8539d81 | 732 | class_intf->remove(class_dev, class_intf); |
51d172d5 | 733 | up(&parent_class->sem); |
1da177e4 LT |
734 | } |
735 | ||
76d1ce00 | 736 | if (class_dev->dev) { |
805fab47 | 737 | remove_deprecated_class_device_links(class_dev); |
1da177e4 | 738 | sysfs_remove_link(&class_dev->kobj, "device"); |
76d1ce00 | 739 | } |
b9d9c82b | 740 | sysfs_remove_link(&class_dev->kobj, "subsystem"); |
ad6a1e1c TH |
741 | class_device_remove_file(class_dev, &class_uevent_attr); |
742 | if (MAJOR(class_dev->devt)) | |
743 | class_device_remove_file(class_dev, &class_devt_attr); | |
1da177e4 | 744 | class_device_remove_attrs(class_dev); |
1498221d | 745 | class_device_remove_groups(class_dev); |
1da177e4 | 746 | |
312c004d | 747 | kobject_uevent(&class_dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
748 | kobject_del(&class_dev->kobj); |
749 | ||
51d172d5 GKH |
750 | class_device_put(parent_device); |
751 | class_put(parent_class); | |
1da177e4 LT |
752 | } |
753 | ||
754 | void class_device_unregister(struct class_device *class_dev) | |
755 | { | |
756 | pr_debug("CLASS: Unregistering class device. ID = '%s'\n", | |
757 | class_dev->class_id); | |
758 | class_device_del(class_dev); | |
759 | class_device_put(class_dev); | |
760 | } | |
761 | ||
2fc68447 GKH |
762 | /** |
763 | * class_device_destroy - removes a class device that was created with class_device_create() | |
764 | * @cls: the pointer to the struct class that this device was registered * with. | |
92a0f861 | 765 | * @devt: the dev_t of the device that was previously registered. |
2fc68447 GKH |
766 | * |
767 | * This call unregisters and cleans up a class device that was created with a | |
768 | * call to class_device_create() | |
769 | */ | |
e9ba6365 GKH |
770 | void class_device_destroy(struct class *cls, dev_t devt) |
771 | { | |
772 | struct class_device *class_dev = NULL; | |
773 | struct class_device *class_dev_tmp; | |
774 | ||
775 | down(&cls->sem); | |
776 | list_for_each_entry(class_dev_tmp, &cls->children, node) { | |
777 | if (class_dev_tmp->devt == devt) { | |
778 | class_dev = class_dev_tmp; | |
779 | break; | |
780 | } | |
781 | } | |
782 | up(&cls->sem); | |
783 | ||
784 | if (class_dev) | |
785 | class_device_unregister(class_dev); | |
786 | } | |
787 | ||
1da177e4 LT |
788 | struct class_device * class_device_get(struct class_device *class_dev) |
789 | { | |
790 | if (class_dev) | |
791 | return to_class_dev(kobject_get(&class_dev->kobj)); | |
792 | return NULL; | |
793 | } | |
794 | ||
795 | void class_device_put(struct class_device *class_dev) | |
796 | { | |
51d172d5 GKH |
797 | if (class_dev) |
798 | kobject_put(&class_dev->kobj); | |
1da177e4 LT |
799 | } |
800 | ||
801 | ||
802 | int class_interface_register(struct class_interface *class_intf) | |
803 | { | |
804 | struct class *parent; | |
805 | struct class_device *class_dev; | |
c47ed219 | 806 | struct device *dev; |
1da177e4 LT |
807 | |
808 | if (!class_intf || !class_intf->class) | |
809 | return -ENODEV; | |
810 | ||
811 | parent = class_get(class_intf->class); | |
812 | if (!parent) | |
813 | return -EINVAL; | |
814 | ||
815 | down(&parent->sem); | |
816 | list_add_tail(&class_intf->node, &parent->interfaces); | |
817 | if (class_intf->add) { | |
818 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 819 | class_intf->add(class_dev, class_intf); |
1da177e4 | 820 | } |
c47ed219 GKH |
821 | if (class_intf->add_dev) { |
822 | list_for_each_entry(dev, &parent->devices, node) | |
823 | class_intf->add_dev(dev, class_intf); | |
824 | } | |
1da177e4 LT |
825 | up(&parent->sem); |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
830 | void class_interface_unregister(struct class_interface *class_intf) | |
831 | { | |
832 | struct class * parent = class_intf->class; | |
833 | struct class_device *class_dev; | |
c47ed219 | 834 | struct device *dev; |
1da177e4 LT |
835 | |
836 | if (!parent) | |
837 | return; | |
838 | ||
839 | down(&parent->sem); | |
840 | list_del_init(&class_intf->node); | |
841 | if (class_intf->remove) { | |
842 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 843 | class_intf->remove(class_dev, class_intf); |
1da177e4 | 844 | } |
c47ed219 GKH |
845 | if (class_intf->remove_dev) { |
846 | list_for_each_entry(dev, &parent->devices, node) | |
847 | class_intf->remove_dev(dev, class_intf); | |
848 | } | |
1da177e4 LT |
849 | up(&parent->sem); |
850 | ||
851 | class_put(parent); | |
852 | } | |
853 | ||
1da177e4 LT |
854 | int __init classes_init(void) |
855 | { | |
856 | int retval; | |
857 | ||
858 | retval = subsystem_register(&class_subsys); | |
859 | if (retval) | |
860 | return retval; | |
861 | ||
862 | /* ick, this is ugly, the things we go through to keep from showing up | |
863 | * in sysfs... */ | |
e4bc1662 | 864 | kset_init(&class_obj_subsys); |
823bccfc GKH |
865 | if (!class_obj_subsys.kobj.parent) |
866 | class_obj_subsys.kobj.parent = &class_obj_subsys.kobj; | |
1da177e4 LT |
867 | return 0; |
868 | } | |
869 | ||
870 | EXPORT_SYMBOL_GPL(class_create_file); | |
871 | EXPORT_SYMBOL_GPL(class_remove_file); | |
872 | EXPORT_SYMBOL_GPL(class_register); | |
873 | EXPORT_SYMBOL_GPL(class_unregister); | |
e9ba6365 GKH |
874 | EXPORT_SYMBOL_GPL(class_create); |
875 | EXPORT_SYMBOL_GPL(class_destroy); | |
1da177e4 LT |
876 | |
877 | EXPORT_SYMBOL_GPL(class_device_register); | |
878 | EXPORT_SYMBOL_GPL(class_device_unregister); | |
879 | EXPORT_SYMBOL_GPL(class_device_initialize); | |
880 | EXPORT_SYMBOL_GPL(class_device_add); | |
881 | EXPORT_SYMBOL_GPL(class_device_del); | |
882 | EXPORT_SYMBOL_GPL(class_device_get); | |
883 | EXPORT_SYMBOL_GPL(class_device_put); | |
e9ba6365 GKH |
884 | EXPORT_SYMBOL_GPL(class_device_create); |
885 | EXPORT_SYMBOL_GPL(class_device_destroy); | |
1da177e4 LT |
886 | EXPORT_SYMBOL_GPL(class_device_create_file); |
887 | EXPORT_SYMBOL_GPL(class_device_remove_file); | |
d919fd43 GKH |
888 | EXPORT_SYMBOL_GPL(class_device_create_bin_file); |
889 | EXPORT_SYMBOL_GPL(class_device_remove_bin_file); | |
1da177e4 LT |
890 | |
891 | EXPORT_SYMBOL_GPL(class_interface_register); | |
892 | EXPORT_SYMBOL_GPL(class_interface_unregister); |