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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> |
edfaa7c3 | 20 | #include <linux/genhd.h> |
1da177e4 LT |
21 | #include "base.h" |
22 | ||
23 | #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) | |
823bccfc | 24 | #define to_class(obj) container_of(obj, struct class, subsys.kobj) |
1da177e4 LT |
25 | |
26 | static ssize_t | |
27 | class_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
28 | { | |
29 | struct class_attribute * class_attr = to_class_attr(attr); | |
30 | struct class * dc = to_class(kobj); | |
4a0c20bf | 31 | ssize_t ret = -EIO; |
1da177e4 LT |
32 | |
33 | if (class_attr->show) | |
34 | ret = class_attr->show(dc, buf); | |
35 | return ret; | |
36 | } | |
37 | ||
38 | static ssize_t | |
39 | class_attr_store(struct kobject * kobj, struct attribute * attr, | |
40 | const char * buf, size_t count) | |
41 | { | |
42 | struct class_attribute * class_attr = to_class_attr(attr); | |
43 | struct class * dc = to_class(kobj); | |
4a0c20bf | 44 | ssize_t ret = -EIO; |
1da177e4 LT |
45 | |
46 | if (class_attr->store) | |
47 | ret = class_attr->store(dc, buf, count); | |
48 | return ret; | |
49 | } | |
50 | ||
51 | static void class_release(struct kobject * kobj) | |
52 | { | |
53 | struct class *class = to_class(kobj); | |
54 | ||
55 | pr_debug("class '%s': release.\n", class->name); | |
56 | ||
57 | if (class->class_release) | |
58 | class->class_release(class); | |
59 | else | |
60 | pr_debug("class '%s' does not have a release() function, " | |
61 | "be careful\n", class->name); | |
62 | } | |
63 | ||
64 | static struct sysfs_ops class_sysfs_ops = { | |
65 | .show = class_attr_show, | |
66 | .store = class_attr_store, | |
67 | }; | |
68 | ||
adc56808 | 69 | static struct kobj_type class_ktype = { |
1da177e4 LT |
70 | .sysfs_ops = &class_sysfs_ops, |
71 | .release = class_release, | |
72 | }; | |
73 | ||
74 | /* Hotplug events for classes go to the class_obj subsys */ | |
443dbf90 | 75 | static struct kset *class_kset; |
1da177e4 LT |
76 | |
77 | ||
78 | int class_create_file(struct class * cls, const struct class_attribute * attr) | |
79 | { | |
80 | int error; | |
81 | if (cls) { | |
823bccfc | 82 | error = sysfs_create_file(&cls->subsys.kobj, &attr->attr); |
1da177e4 LT |
83 | } else |
84 | error = -EINVAL; | |
85 | return error; | |
86 | } | |
87 | ||
88 | void class_remove_file(struct class * cls, const struct class_attribute * attr) | |
89 | { | |
90 | if (cls) | |
823bccfc | 91 | sysfs_remove_file(&cls->subsys.kobj, &attr->attr); |
1da177e4 LT |
92 | } |
93 | ||
1740757e | 94 | static struct class *class_get(struct class *cls) |
1da177e4 LT |
95 | { |
96 | if (cls) | |
1ef4cfac | 97 | return container_of(kset_get(&cls->subsys), struct class, subsys); |
1da177e4 LT |
98 | return NULL; |
99 | } | |
100 | ||
1740757e | 101 | static void class_put(struct class * cls) |
1da177e4 | 102 | { |
51d172d5 | 103 | if (cls) |
6e9d930d | 104 | kset_put(&cls->subsys); |
1da177e4 LT |
105 | } |
106 | ||
107 | ||
108 | static int add_class_attrs(struct class * cls) | |
109 | { | |
110 | int i; | |
111 | int error = 0; | |
112 | ||
113 | if (cls->class_attrs) { | |
114 | for (i = 0; attr_name(cls->class_attrs[i]); i++) { | |
115 | error = class_create_file(cls,&cls->class_attrs[i]); | |
116 | if (error) | |
117 | goto Err; | |
118 | } | |
119 | } | |
120 | Done: | |
121 | return error; | |
122 | Err: | |
123 | while (--i >= 0) | |
124 | class_remove_file(cls,&cls->class_attrs[i]); | |
125 | goto Done; | |
126 | } | |
127 | ||
128 | static void remove_class_attrs(struct class * cls) | |
129 | { | |
130 | int i; | |
131 | ||
132 | if (cls->class_attrs) { | |
133 | for (i = 0; attr_name(cls->class_attrs[i]); i++) | |
134 | class_remove_file(cls,&cls->class_attrs[i]); | |
135 | } | |
136 | } | |
137 | ||
138 | int class_register(struct class * cls) | |
139 | { | |
140 | int error; | |
141 | ||
142 | pr_debug("device class '%s': registering\n", cls->name); | |
143 | ||
144 | INIT_LIST_HEAD(&cls->children); | |
23681e47 | 145 | INIT_LIST_HEAD(&cls->devices); |
1da177e4 | 146 | INIT_LIST_HEAD(&cls->interfaces); |
86406245 | 147 | kset_init(&cls->class_dirs); |
1da177e4 | 148 | init_MUTEX(&cls->sem); |
823bccfc | 149 | error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name); |
1da177e4 LT |
150 | if (error) |
151 | return error; | |
152 | ||
edfaa7c3 KS |
153 | #ifdef CONFIG_SYSFS_DEPRECATED |
154 | /* let the block class directory show up in the root of sysfs */ | |
155 | if (cls != &block_class) | |
156 | cls->subsys.kobj.kset = class_kset; | |
157 | #else | |
443dbf90 | 158 | cls->subsys.kobj.kset = class_kset; |
edfaa7c3 | 159 | #endif |
3514faca | 160 | cls->subsys.kobj.ktype = &class_ktype; |
1da177e4 | 161 | |
2fb9113b | 162 | error = kset_register(&cls->subsys); |
1da177e4 LT |
163 | if (!error) { |
164 | error = add_class_attrs(class_get(cls)); | |
165 | class_put(cls); | |
166 | } | |
167 | return error; | |
168 | } | |
169 | ||
170 | void class_unregister(struct class * cls) | |
171 | { | |
172 | pr_debug("device class '%s': unregistering\n", cls->name); | |
173 | remove_class_attrs(cls); | |
2fb9113b | 174 | kset_unregister(&cls->subsys); |
1da177e4 LT |
175 | } |
176 | ||
e9ba6365 GKH |
177 | static void class_create_release(struct class *cls) |
178 | { | |
51d172d5 | 179 | pr_debug("%s called for %s\n", __FUNCTION__, cls->name); |
e9ba6365 GKH |
180 | kfree(cls); |
181 | } | |
182 | ||
183 | static void class_device_create_release(struct class_device *class_dev) | |
184 | { | |
51d172d5 | 185 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); |
e9ba6365 GKH |
186 | kfree(class_dev); |
187 | } | |
188 | ||
51d172d5 | 189 | /* needed to allow these devices to have parent class devices */ |
312c004d | 190 | static int class_device_create_uevent(struct class_device *class_dev, |
7eff2e7a | 191 | struct kobj_uevent_env *env) |
51d172d5 GKH |
192 | { |
193 | pr_debug("%s called for %s\n", __FUNCTION__, class_dev->class_id); | |
194 | return 0; | |
195 | } | |
196 | ||
2fc68447 GKH |
197 | /** |
198 | * class_create - create a struct class structure | |
199 | * @owner: pointer to the module that is to "own" this struct class | |
200 | * @name: pointer to a string for the name of this class. | |
201 | * | |
202 | * This is used to create a struct class pointer that can then be used | |
203 | * in calls to class_device_create(). | |
204 | * | |
205 | * Note, the pointer created here is to be destroyed when finished by | |
206 | * making a call to class_destroy(). | |
207 | */ | |
ab7d7371 | 208 | struct class *class_create(struct module *owner, const char *name) |
e9ba6365 GKH |
209 | { |
210 | struct class *cls; | |
211 | int retval; | |
212 | ||
4aed0644 | 213 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
e9ba6365 GKH |
214 | if (!cls) { |
215 | retval = -ENOMEM; | |
216 | goto error; | |
217 | } | |
e9ba6365 GKH |
218 | |
219 | cls->name = name; | |
220 | cls->owner = owner; | |
221 | cls->class_release = class_create_release; | |
222 | cls->release = class_device_create_release; | |
223 | ||
224 | retval = class_register(cls); | |
225 | if (retval) | |
226 | goto error; | |
227 | ||
228 | return cls; | |
229 | ||
230 | error: | |
231 | kfree(cls); | |
232 | return ERR_PTR(retval); | |
233 | } | |
234 | ||
2fc68447 GKH |
235 | /** |
236 | * class_destroy - destroys a struct class structure | |
92a0f861 | 237 | * @cls: pointer to the struct class that is to be destroyed |
2fc68447 GKH |
238 | * |
239 | * Note, the pointer to be destroyed must have been created with a call | |
240 | * to class_create(). | |
241 | */ | |
e9ba6365 GKH |
242 | void class_destroy(struct class *cls) |
243 | { | |
244 | if ((cls == NULL) || (IS_ERR(cls))) | |
245 | return; | |
246 | ||
247 | class_unregister(cls); | |
248 | } | |
1da177e4 LT |
249 | |
250 | /* Class Device Stuff */ | |
251 | ||
252 | int class_device_create_file(struct class_device * class_dev, | |
253 | const struct class_device_attribute * attr) | |
254 | { | |
255 | int error = -EINVAL; | |
256 | if (class_dev) | |
257 | error = sysfs_create_file(&class_dev->kobj, &attr->attr); | |
258 | return error; | |
259 | } | |
260 | ||
261 | void class_device_remove_file(struct class_device * class_dev, | |
262 | const struct class_device_attribute * attr) | |
263 | { | |
264 | if (class_dev) | |
265 | sysfs_remove_file(&class_dev->kobj, &attr->attr); | |
266 | } | |
267 | ||
d919fd43 GKH |
268 | int class_device_create_bin_file(struct class_device *class_dev, |
269 | struct bin_attribute *attr) | |
270 | { | |
271 | int error = -EINVAL; | |
272 | if (class_dev) | |
273 | error = sysfs_create_bin_file(&class_dev->kobj, attr); | |
274 | return error; | |
275 | } | |
276 | ||
277 | void class_device_remove_bin_file(struct class_device *class_dev, | |
278 | struct bin_attribute *attr) | |
279 | { | |
280 | if (class_dev) | |
281 | sysfs_remove_bin_file(&class_dev->kobj, attr); | |
282 | } | |
283 | ||
1da177e4 LT |
284 | static ssize_t |
285 | class_device_attr_show(struct kobject * kobj, struct attribute * attr, | |
286 | char * buf) | |
287 | { | |
288 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
289 | struct class_device * cd = to_class_dev(kobj); | |
290 | ssize_t ret = 0; | |
291 | ||
292 | if (class_dev_attr->show) | |
293 | ret = class_dev_attr->show(cd, buf); | |
294 | return ret; | |
295 | } | |
296 | ||
297 | static ssize_t | |
298 | class_device_attr_store(struct kobject * kobj, struct attribute * attr, | |
299 | const char * buf, size_t count) | |
300 | { | |
301 | struct class_device_attribute * class_dev_attr = to_class_dev_attr(attr); | |
302 | struct class_device * cd = to_class_dev(kobj); | |
303 | ssize_t ret = 0; | |
304 | ||
305 | if (class_dev_attr->store) | |
306 | ret = class_dev_attr->store(cd, buf, count); | |
307 | return ret; | |
308 | } | |
309 | ||
310 | static struct sysfs_ops class_dev_sysfs_ops = { | |
311 | .show = class_device_attr_show, | |
312 | .store = class_device_attr_store, | |
313 | }; | |
314 | ||
315 | static void class_dev_release(struct kobject * kobj) | |
316 | { | |
317 | struct class_device *cd = to_class_dev(kobj); | |
318 | struct class * cls = cd->class; | |
319 | ||
320 | pr_debug("device class '%s': release.\n", cd->class_id); | |
321 | ||
51d172d5 GKH |
322 | if (cd->release) |
323 | cd->release(cd); | |
324 | else if (cls->release) | |
1da177e4 LT |
325 | cls->release(cd); |
326 | else { | |
51d172d5 | 327 | printk(KERN_ERR "Class Device '%s' does not have a release() function, " |
1da177e4 LT |
328 | "it is broken and must be fixed.\n", |
329 | cd->class_id); | |
330 | WARN_ON(1); | |
331 | } | |
332 | } | |
333 | ||
adc56808 | 334 | static struct kobj_type class_device_ktype = { |
1da177e4 LT |
335 | .sysfs_ops = &class_dev_sysfs_ops, |
336 | .release = class_dev_release, | |
337 | }; | |
338 | ||
312c004d | 339 | static int class_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
340 | { |
341 | struct kobj_type *ktype = get_ktype(kobj); | |
342 | ||
adc56808 | 343 | if (ktype == &class_device_ktype) { |
1da177e4 LT |
344 | struct class_device *class_dev = to_class_dev(kobj); |
345 | if (class_dev->class) | |
346 | return 1; | |
347 | } | |
348 | return 0; | |
349 | } | |
350 | ||
312c004d | 351 | static const char *class_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
352 | { |
353 | struct class_device *class_dev = to_class_dev(kobj); | |
354 | ||
355 | return class_dev->class->name; | |
356 | } | |
357 | ||
805fab47 KS |
358 | #ifdef CONFIG_SYSFS_DEPRECATED |
359 | char *make_class_name(const char *name, struct kobject *kobj) | |
360 | { | |
361 | char *class_name; | |
362 | int size; | |
363 | ||
364 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; | |
365 | ||
366 | class_name = kmalloc(size, GFP_KERNEL); | |
367 | if (!class_name) | |
cb360bbf | 368 | return NULL; |
805fab47 KS |
369 | |
370 | strcpy(class_name, name); | |
371 | strcat(class_name, ":"); | |
372 | strcat(class_name, kobject_name(kobj)); | |
373 | return class_name; | |
374 | } | |
375 | ||
805fab47 KS |
376 | static int make_deprecated_class_device_links(struct class_device *class_dev) |
377 | { | |
378 | char *class_name; | |
379 | int error; | |
380 | ||
381 | if (!class_dev->dev) | |
382 | return 0; | |
383 | ||
384 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
385 | if (class_name) |
386 | error = sysfs_create_link(&class_dev->dev->kobj, | |
387 | &class_dev->kobj, class_name); | |
388 | else | |
389 | error = -ENOMEM; | |
805fab47 KS |
390 | kfree(class_name); |
391 | return error; | |
392 | } | |
393 | ||
394 | static void remove_deprecated_class_device_links(struct class_device *class_dev) | |
395 | { | |
396 | char *class_name; | |
397 | ||
398 | if (!class_dev->dev) | |
399 | return; | |
400 | ||
401 | class_name = make_class_name(class_dev->class->name, &class_dev->kobj); | |
cb360bbf CH |
402 | if (class_name) |
403 | sysfs_remove_link(&class_dev->dev->kobj, class_name); | |
805fab47 KS |
404 | kfree(class_name); |
405 | } | |
406 | #else | |
805fab47 KS |
407 | static inline int make_deprecated_class_device_links(struct class_device *cd) |
408 | { return 0; } | |
409 | static void remove_deprecated_class_device_links(struct class_device *cd) | |
410 | { } | |
411 | #endif | |
412 | ||
7eff2e7a KS |
413 | static int class_uevent(struct kset *kset, struct kobject *kobj, |
414 | struct kobj_uevent_env *env) | |
1da177e4 LT |
415 | { |
416 | struct class_device *class_dev = to_class_dev(kobj); | |
2c7afd12 | 417 | struct device *dev = class_dev->dev; |
1da177e4 LT |
418 | int retval = 0; |
419 | ||
420 | pr_debug("%s - name = %s\n", __FUNCTION__, class_dev->class_id); | |
421 | ||
1da177e4 | 422 | if (MAJOR(class_dev->devt)) { |
7eff2e7a | 423 | add_uevent_var(env, "MAJOR=%u", MAJOR(class_dev->devt)); |
1da177e4 | 424 | |
7eff2e7a | 425 | add_uevent_var(env, "MINOR=%u", MINOR(class_dev->devt)); |
1da177e4 LT |
426 | } |
427 | ||
2c7afd12 KS |
428 | if (dev) { |
429 | const char *path = kobject_get_path(&dev->kobj, GFP_KERNEL); | |
430 | if (path) { | |
7eff2e7a | 431 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
432 | kfree(path); |
433 | } | |
434 | ||
435 | if (dev->bus) | |
7eff2e7a | 436 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
2c7afd12 KS |
437 | |
438 | if (dev->driver) | |
7eff2e7a | 439 | add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); |
2c7afd12 KS |
440 | } |
441 | ||
312c004d | 442 | if (class_dev->uevent) { |
51d172d5 | 443 | /* have the class device specific function add its stuff */ |
7eff2e7a | 444 | retval = class_dev->uevent(class_dev, env); |
51d172d5 | 445 | if (retval) |
312c004d KS |
446 | pr_debug("class_dev->uevent() returned %d\n", retval); |
447 | } else if (class_dev->class->uevent) { | |
51d172d5 | 448 | /* have the class specific function add its stuff */ |
7eff2e7a | 449 | retval = class_dev->class->uevent(class_dev, env); |
51d172d5 | 450 | if (retval) |
312c004d | 451 | pr_debug("class->uevent() returned %d\n", retval); |
1da177e4 LT |
452 | } |
453 | ||
454 | return retval; | |
455 | } | |
456 | ||
312c004d KS |
457 | static struct kset_uevent_ops class_uevent_ops = { |
458 | .filter = class_uevent_filter, | |
459 | .name = class_uevent_name, | |
460 | .uevent = class_uevent, | |
1da177e4 LT |
461 | }; |
462 | ||
5c03c7ab GKH |
463 | /* |
464 | * DO NOT copy how this is created, kset_create_and_add() should be | |
465 | * called, but this is a hold-over from the old-way and will be deleted | |
466 | * entirely soon. | |
467 | */ | |
468 | static struct kset class_obj_subsys = { | |
469 | .kobj = { .k_name = "class_obj", }, | |
470 | .uevent_ops = &class_uevent_ops, | |
471 | }; | |
1da177e4 LT |
472 | |
473 | static int class_device_add_attrs(struct class_device * cd) | |
474 | { | |
475 | int i; | |
476 | int error = 0; | |
477 | struct class * cls = cd->class; | |
478 | ||
479 | if (cls->class_dev_attrs) { | |
480 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) { | |
481 | error = class_device_create_file(cd, | |
482 | &cls->class_dev_attrs[i]); | |
483 | if (error) | |
484 | goto Err; | |
485 | } | |
486 | } | |
487 | Done: | |
488 | return error; | |
489 | Err: | |
490 | while (--i >= 0) | |
491 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
492 | goto Done; | |
493 | } | |
494 | ||
495 | static void class_device_remove_attrs(struct class_device * cd) | |
496 | { | |
497 | int i; | |
498 | struct class * cls = cd->class; | |
499 | ||
500 | if (cls->class_dev_attrs) { | |
501 | for (i = 0; attr_name(cls->class_dev_attrs[i]); i++) | |
502 | class_device_remove_file(cd,&cls->class_dev_attrs[i]); | |
503 | } | |
504 | } | |
505 | ||
1498221d SH |
506 | static int class_device_add_groups(struct class_device * cd) |
507 | { | |
508 | int i; | |
509 | int error = 0; | |
510 | ||
511 | if (cd->groups) { | |
512 | for (i = 0; cd->groups[i]; i++) { | |
513 | error = sysfs_create_group(&cd->kobj, cd->groups[i]); | |
514 | if (error) { | |
515 | while (--i >= 0) | |
516 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
517 | goto out; | |
518 | } | |
519 | } | |
520 | } | |
521 | out: | |
522 | return error; | |
523 | } | |
524 | ||
525 | static void class_device_remove_groups(struct class_device * cd) | |
526 | { | |
527 | int i; | |
528 | if (cd->groups) { | |
529 | for (i = 0; cd->groups[i]; i++) { | |
530 | sysfs_remove_group(&cd->kobj, cd->groups[i]); | |
531 | } | |
532 | } | |
533 | } | |
534 | ||
1da177e4 LT |
535 | static ssize_t show_dev(struct class_device *class_dev, char *buf) |
536 | { | |
537 | return print_dev_t(buf, class_dev->devt); | |
538 | } | |
1da177e4 | 539 | |
ad6a1e1c TH |
540 | static struct class_device_attribute class_devt_attr = |
541 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
542 | ||
a7fd6706 KS |
543 | static ssize_t store_uevent(struct class_device *class_dev, |
544 | const char *buf, size_t count) | |
545 | { | |
312c004d | 546 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
547 | return count; |
548 | } | |
549 | ||
ad6a1e1c TH |
550 | static struct class_device_attribute class_uevent_attr = |
551 | __ATTR(uevent, S_IWUSR, NULL, store_uevent); | |
552 | ||
1da177e4 LT |
553 | void class_device_initialize(struct class_device *class_dev) |
554 | { | |
3514faca | 555 | class_dev->kobj.kset = &class_obj_subsys; |
60728d62 | 556 | kobject_init_ng(&class_dev->kobj, &class_device_ktype); |
1da177e4 LT |
557 | INIT_LIST_HEAD(&class_dev->node); |
558 | } | |
559 | ||
560 | int class_device_add(struct class_device *class_dev) | |
561 | { | |
51d172d5 GKH |
562 | struct class *parent_class = NULL; |
563 | struct class_device *parent_class_dev = NULL; | |
564 | struct class_interface *class_intf; | |
51d172d5 | 565 | int error = -EINVAL; |
1da177e4 LT |
566 | |
567 | class_dev = class_device_get(class_dev); | |
568 | if (!class_dev) | |
569 | return -EINVAL; | |
570 | ||
51d172d5 | 571 | if (!strlen(class_dev->class_id)) |
b7fe4a60 | 572 | goto out1; |
1da177e4 | 573 | |
51d172d5 GKH |
574 | parent_class = class_get(class_dev->class); |
575 | if (!parent_class) | |
b7fe4a60 SH |
576 | goto out1; |
577 | ||
51d172d5 | 578 | parent_class_dev = class_device_get(class_dev->parent); |
1da177e4 LT |
579 | |
580 | pr_debug("CLASS: registering class device: ID = '%s'\n", | |
581 | class_dev->class_id); | |
582 | ||
583 | /* first, register with generic layer. */ | |
51d172d5 GKH |
584 | if (parent_class_dev) |
585 | class_dev->kobj.parent = &parent_class_dev->kobj; | |
586 | else | |
823bccfc | 587 | class_dev->kobj.parent = &parent_class->subsys.kobj; |
1da177e4 | 588 | |
60728d62 GKH |
589 | error = kobject_add_ng(&class_dev->kobj, class_dev->kobj.parent, |
590 | "%s", class_dev->class_id); | |
51d172d5 | 591 | if (error) |
b7fe4a60 | 592 | goto out2; |
1da177e4 | 593 | |
e9ba6365 | 594 | /* add the needed attributes to this device */ |
f0e1761a | 595 | error = sysfs_create_link(&class_dev->kobj, |
823bccfc | 596 | &parent_class->subsys.kobj, "subsystem"); |
f0e1761a CH |
597 | if (error) |
598 | goto out3; | |
ad6a1e1c TH |
599 | |
600 | error = class_device_create_file(class_dev, &class_uevent_attr); | |
b7fe4a60 SH |
601 | if (error) |
602 | goto out3; | |
a7fd6706 | 603 | |
e9ba6365 | 604 | if (MAJOR(class_dev->devt)) { |
ad6a1e1c TH |
605 | error = class_device_create_file(class_dev, &class_devt_attr); |
606 | if (error) | |
b7fe4a60 | 607 | goto out4; |
e9ba6365 GKH |
608 | } |
609 | ||
b7fe4a60 SH |
610 | error = class_device_add_attrs(class_dev); |
611 | if (error) | |
612 | goto out5; | |
613 | ||
76d1ce00 | 614 | if (class_dev->dev) { |
b7fe4a60 SH |
615 | error = sysfs_create_link(&class_dev->kobj, |
616 | &class_dev->dev->kobj, "device"); | |
617 | if (error) | |
618 | goto out6; | |
76d1ce00 | 619 | } |
e9ba6365 | 620 | |
b7fe4a60 | 621 | error = class_device_add_groups(class_dev); |
805fab47 KS |
622 | if (error) |
623 | goto out7; | |
624 | ||
625 | error = make_deprecated_class_device_links(class_dev); | |
b7fe4a60 SH |
626 | if (error) |
627 | goto out8; | |
1498221d | 628 | |
312c004d | 629 | kobject_uevent(&class_dev->kobj, KOBJ_ADD); |
dbe9035d | 630 | |
e9ba6365 | 631 | /* notify any interfaces this device is now here */ |
a1438890 J |
632 | down(&parent_class->sem); |
633 | list_add_tail(&class_dev->node, &parent_class->children); | |
634 | list_for_each_entry(class_intf, &parent_class->interfaces, node) { | |
635 | if (class_intf->add) | |
636 | class_intf->add(class_dev, class_intf); | |
1da177e4 | 637 | } |
a1438890 | 638 | up(&parent_class->sem); |
e9ba6365 | 639 | |
b7fe4a60 SH |
640 | goto out1; |
641 | ||
642 | out8: | |
805fab47 | 643 | class_device_remove_groups(class_dev); |
b7fe4a60 SH |
644 | out7: |
645 | if (class_dev->dev) | |
646 | sysfs_remove_link(&class_dev->kobj, "device"); | |
647 | out6: | |
648 | class_device_remove_attrs(class_dev); | |
649 | out5: | |
ad6a1e1c TH |
650 | if (MAJOR(class_dev->devt)) |
651 | class_device_remove_file(class_dev, &class_devt_attr); | |
b7fe4a60 | 652 | out4: |
ad6a1e1c | 653 | class_device_remove_file(class_dev, &class_uevent_attr); |
b7fe4a60 SH |
654 | out3: |
655 | kobject_del(&class_dev->kobj); | |
656 | out2: | |
657 | if(parent_class_dev) | |
51d172d5 | 658 | class_device_put(parent_class_dev); |
b7fe4a60 SH |
659 | class_put(parent_class); |
660 | out1: | |
1da177e4 LT |
661 | class_device_put(class_dev); |
662 | return error; | |
663 | } | |
664 | ||
665 | int class_device_register(struct class_device *class_dev) | |
666 | { | |
667 | class_device_initialize(class_dev); | |
668 | return class_device_add(class_dev); | |
669 | } | |
670 | ||
2fc68447 GKH |
671 | /** |
672 | * class_device_create - creates a class device and registers it with sysfs | |
92a0f861 | 673 | * @cls: pointer to the struct class that this device should be registered to. |
51d172d5 | 674 | * @parent: pointer to the parent struct class_device of this new device, if any. |
92a0f861 | 675 | * @devt: the dev_t for the char device to be added. |
2fc68447 GKH |
676 | * @device: a pointer to a struct device that is assiociated with this class device. |
677 | * @fmt: string for the class device's name | |
678 | * | |
679 | * This function can be used by char device classes. A struct | |
680 | * class_device will be created in sysfs, registered to the specified | |
51d172d5 GKH |
681 | * class. |
682 | * A "dev" file will be created, showing the dev_t for the device, if | |
683 | * the dev_t is not 0,0. | |
684 | * If a pointer to a parent struct class_device is passed in, the newly | |
685 | * created struct class_device will be a child of that device in sysfs. | |
686 | * The pointer to the struct class_device will be returned from the | |
687 | * call. Any further sysfs files that might be required can be created | |
688 | * using this pointer. | |
2fc68447 GKH |
689 | * |
690 | * Note: the struct class passed to this function must have previously | |
691 | * been created with a call to class_create(). | |
692 | */ | |
51d172d5 GKH |
693 | struct class_device *class_device_create(struct class *cls, |
694 | struct class_device *parent, | |
695 | dev_t devt, | |
ddd5d35a DT |
696 | struct device *device, |
697 | const char *fmt, ...) | |
e9ba6365 GKH |
698 | { |
699 | va_list args; | |
700 | struct class_device *class_dev = NULL; | |
701 | int retval = -ENODEV; | |
702 | ||
703 | if (cls == NULL || IS_ERR(cls)) | |
704 | goto error; | |
705 | ||
4aed0644 | 706 | class_dev = kzalloc(sizeof(*class_dev), GFP_KERNEL); |
e9ba6365 GKH |
707 | if (!class_dev) { |
708 | retval = -ENOMEM; | |
709 | goto error; | |
710 | } | |
e9ba6365 GKH |
711 | |
712 | class_dev->devt = devt; | |
713 | class_dev->dev = device; | |
714 | class_dev->class = cls; | |
51d172d5 GKH |
715 | class_dev->parent = parent; |
716 | class_dev->release = class_device_create_release; | |
312c004d | 717 | class_dev->uevent = class_device_create_uevent; |
e9ba6365 GKH |
718 | |
719 | va_start(args, fmt); | |
720 | vsnprintf(class_dev->class_id, BUS_ID_SIZE, fmt, args); | |
721 | va_end(args); | |
722 | retval = class_device_register(class_dev); | |
723 | if (retval) | |
724 | goto error; | |
725 | ||
726 | return class_dev; | |
727 | ||
728 | error: | |
729 | kfree(class_dev); | |
730 | return ERR_PTR(retval); | |
731 | } | |
732 | ||
1da177e4 LT |
733 | void class_device_del(struct class_device *class_dev) |
734 | { | |
51d172d5 GKH |
735 | struct class *parent_class = class_dev->class; |
736 | struct class_device *parent_device = class_dev->parent; | |
737 | struct class_interface *class_intf; | |
1da177e4 | 738 | |
51d172d5 GKH |
739 | if (parent_class) { |
740 | down(&parent_class->sem); | |
1da177e4 | 741 | list_del_init(&class_dev->node); |
51d172d5 | 742 | list_for_each_entry(class_intf, &parent_class->interfaces, node) |
1da177e4 | 743 | if (class_intf->remove) |
d8539d81 | 744 | class_intf->remove(class_dev, class_intf); |
51d172d5 | 745 | up(&parent_class->sem); |
1da177e4 LT |
746 | } |
747 | ||
76d1ce00 | 748 | if (class_dev->dev) { |
805fab47 | 749 | remove_deprecated_class_device_links(class_dev); |
1da177e4 | 750 | sysfs_remove_link(&class_dev->kobj, "device"); |
76d1ce00 | 751 | } |
b9d9c82b | 752 | sysfs_remove_link(&class_dev->kobj, "subsystem"); |
ad6a1e1c TH |
753 | class_device_remove_file(class_dev, &class_uevent_attr); |
754 | if (MAJOR(class_dev->devt)) | |
755 | class_device_remove_file(class_dev, &class_devt_attr); | |
1da177e4 | 756 | class_device_remove_attrs(class_dev); |
1498221d | 757 | class_device_remove_groups(class_dev); |
1da177e4 | 758 | |
312c004d | 759 | kobject_uevent(&class_dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
760 | kobject_del(&class_dev->kobj); |
761 | ||
51d172d5 GKH |
762 | class_device_put(parent_device); |
763 | class_put(parent_class); | |
1da177e4 LT |
764 | } |
765 | ||
766 | void class_device_unregister(struct class_device *class_dev) | |
767 | { | |
768 | pr_debug("CLASS: Unregistering class device. ID = '%s'\n", | |
769 | class_dev->class_id); | |
770 | class_device_del(class_dev); | |
771 | class_device_put(class_dev); | |
772 | } | |
773 | ||
2fc68447 GKH |
774 | /** |
775 | * class_device_destroy - removes a class device that was created with class_device_create() | |
776 | * @cls: the pointer to the struct class that this device was registered * with. | |
92a0f861 | 777 | * @devt: the dev_t of the device that was previously registered. |
2fc68447 GKH |
778 | * |
779 | * This call unregisters and cleans up a class device that was created with a | |
780 | * call to class_device_create() | |
781 | */ | |
e9ba6365 GKH |
782 | void class_device_destroy(struct class *cls, dev_t devt) |
783 | { | |
784 | struct class_device *class_dev = NULL; | |
785 | struct class_device *class_dev_tmp; | |
786 | ||
787 | down(&cls->sem); | |
788 | list_for_each_entry(class_dev_tmp, &cls->children, node) { | |
789 | if (class_dev_tmp->devt == devt) { | |
790 | class_dev = class_dev_tmp; | |
791 | break; | |
792 | } | |
793 | } | |
794 | up(&cls->sem); | |
795 | ||
796 | if (class_dev) | |
797 | class_device_unregister(class_dev); | |
798 | } | |
799 | ||
1da177e4 LT |
800 | struct class_device * class_device_get(struct class_device *class_dev) |
801 | { | |
802 | if (class_dev) | |
803 | return to_class_dev(kobject_get(&class_dev->kobj)); | |
804 | return NULL; | |
805 | } | |
806 | ||
807 | void class_device_put(struct class_device *class_dev) | |
808 | { | |
51d172d5 GKH |
809 | if (class_dev) |
810 | kobject_put(&class_dev->kobj); | |
1da177e4 LT |
811 | } |
812 | ||
813 | ||
814 | int class_interface_register(struct class_interface *class_intf) | |
815 | { | |
816 | struct class *parent; | |
817 | struct class_device *class_dev; | |
c47ed219 | 818 | struct device *dev; |
1da177e4 LT |
819 | |
820 | if (!class_intf || !class_intf->class) | |
821 | return -ENODEV; | |
822 | ||
823 | parent = class_get(class_intf->class); | |
824 | if (!parent) | |
825 | return -EINVAL; | |
826 | ||
827 | down(&parent->sem); | |
828 | list_add_tail(&class_intf->node, &parent->interfaces); | |
829 | if (class_intf->add) { | |
830 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 831 | class_intf->add(class_dev, class_intf); |
1da177e4 | 832 | } |
c47ed219 GKH |
833 | if (class_intf->add_dev) { |
834 | list_for_each_entry(dev, &parent->devices, node) | |
835 | class_intf->add_dev(dev, class_intf); | |
836 | } | |
1da177e4 LT |
837 | up(&parent->sem); |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
842 | void class_interface_unregister(struct class_interface *class_intf) | |
843 | { | |
844 | struct class * parent = class_intf->class; | |
845 | struct class_device *class_dev; | |
c47ed219 | 846 | struct device *dev; |
1da177e4 LT |
847 | |
848 | if (!parent) | |
849 | return; | |
850 | ||
851 | down(&parent->sem); | |
852 | list_del_init(&class_intf->node); | |
853 | if (class_intf->remove) { | |
854 | list_for_each_entry(class_dev, &parent->children, node) | |
d8539d81 | 855 | class_intf->remove(class_dev, class_intf); |
1da177e4 | 856 | } |
c47ed219 GKH |
857 | if (class_intf->remove_dev) { |
858 | list_for_each_entry(dev, &parent->devices, node) | |
859 | class_intf->remove_dev(dev, class_intf); | |
860 | } | |
1da177e4 LT |
861 | up(&parent->sem); |
862 | ||
863 | class_put(parent); | |
864 | } | |
865 | ||
1da177e4 LT |
866 | int __init classes_init(void) |
867 | { | |
443dbf90 GKH |
868 | class_kset = kset_create_and_add("class", NULL, NULL); |
869 | if (!class_kset) | |
870 | return -ENOMEM; | |
1da177e4 LT |
871 | |
872 | /* ick, this is ugly, the things we go through to keep from showing up | |
873 | * in sysfs... */ | |
e4bc1662 | 874 | kset_init(&class_obj_subsys); |
823bccfc GKH |
875 | if (!class_obj_subsys.kobj.parent) |
876 | class_obj_subsys.kobj.parent = &class_obj_subsys.kobj; | |
1da177e4 LT |
877 | return 0; |
878 | } | |
879 | ||
880 | EXPORT_SYMBOL_GPL(class_create_file); | |
881 | EXPORT_SYMBOL_GPL(class_remove_file); | |
882 | EXPORT_SYMBOL_GPL(class_register); | |
883 | EXPORT_SYMBOL_GPL(class_unregister); | |
e9ba6365 GKH |
884 | EXPORT_SYMBOL_GPL(class_create); |
885 | EXPORT_SYMBOL_GPL(class_destroy); | |
1da177e4 LT |
886 | |
887 | EXPORT_SYMBOL_GPL(class_device_register); | |
888 | EXPORT_SYMBOL_GPL(class_device_unregister); | |
889 | EXPORT_SYMBOL_GPL(class_device_initialize); | |
890 | EXPORT_SYMBOL_GPL(class_device_add); | |
891 | EXPORT_SYMBOL_GPL(class_device_del); | |
892 | EXPORT_SYMBOL_GPL(class_device_get); | |
893 | EXPORT_SYMBOL_GPL(class_device_put); | |
e9ba6365 GKH |
894 | EXPORT_SYMBOL_GPL(class_device_create); |
895 | EXPORT_SYMBOL_GPL(class_device_destroy); | |
1da177e4 LT |
896 | EXPORT_SYMBOL_GPL(class_device_create_file); |
897 | EXPORT_SYMBOL_GPL(class_device_remove_file); | |
d919fd43 GKH |
898 | EXPORT_SYMBOL_GPL(class_device_create_bin_file); |
899 | EXPORT_SYMBOL_GPL(class_device_remove_bin_file); | |
1da177e4 LT |
900 | |
901 | EXPORT_SYMBOL_GPL(class_interface_register); | |
902 | EXPORT_SYMBOL_GPL(class_interface_unregister); |