Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
23681e47 | 19 | #include <linux/kdev_t.h> |
116af378 | 20 | #include <linux/notifier.h> |
1da177e4 LT |
21 | |
22 | #include <asm/semaphore.h> | |
23 | ||
24 | #include "base.h" | |
25 | #include "power/power.h" | |
26 | ||
27 | int (*platform_notify)(struct device * dev) = NULL; | |
28 | int (*platform_notify_remove)(struct device * dev) = NULL; | |
29 | ||
30 | /* | |
31 | * sysfs bindings for devices. | |
32 | */ | |
33 | ||
3e95637a AS |
34 | /** |
35 | * dev_driver_string - Return a device's driver name, if at all possible | |
36 | * @dev: struct device to get the name of | |
37 | * | |
38 | * Will return the device's driver's name if it is bound to a device. If | |
39 | * the device is not bound to a device, it will return the name of the bus | |
40 | * it is attached to. If it is not attached to a bus either, an empty | |
41 | * string will be returned. | |
42 | */ | |
43 | const char *dev_driver_string(struct device *dev) | |
44 | { | |
45 | return dev->driver ? dev->driver->name : | |
a456b702 JD |
46 | (dev->bus ? dev->bus->name : |
47 | (dev->class ? dev->class->name : "")); | |
3e95637a | 48 | } |
310a922d | 49 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 50 | |
1da177e4 LT |
51 | #define to_dev(obj) container_of(obj, struct device, kobj) |
52 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
53 | ||
1da177e4 LT |
54 | static ssize_t |
55 | dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
56 | { | |
57 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
58 | struct device * dev = to_dev(kobj); | |
4a0c20bf | 59 | ssize_t ret = -EIO; |
1da177e4 LT |
60 | |
61 | if (dev_attr->show) | |
54b6f35c | 62 | ret = dev_attr->show(dev, dev_attr, buf); |
1da177e4 LT |
63 | return ret; |
64 | } | |
65 | ||
66 | static ssize_t | |
67 | dev_attr_store(struct kobject * kobj, struct attribute * attr, | |
68 | const char * buf, size_t count) | |
69 | { | |
70 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
71 | struct device * dev = to_dev(kobj); | |
4a0c20bf | 72 | ssize_t ret = -EIO; |
1da177e4 LT |
73 | |
74 | if (dev_attr->store) | |
54b6f35c | 75 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
76 | return ret; |
77 | } | |
78 | ||
79 | static struct sysfs_ops dev_sysfs_ops = { | |
80 | .show = dev_attr_show, | |
81 | .store = dev_attr_store, | |
82 | }; | |
83 | ||
84 | ||
85 | /** | |
86 | * device_release - free device structure. | |
87 | * @kobj: device's kobject. | |
88 | * | |
89 | * This is called once the reference count for the object | |
90 | * reaches 0. We forward the call to the device's release | |
91 | * method, which should handle actually freeing the structure. | |
92 | */ | |
93 | static void device_release(struct kobject * kobj) | |
94 | { | |
95 | struct device * dev = to_dev(kobj); | |
96 | ||
97 | if (dev->release) | |
98 | dev->release(dev); | |
f9f852df KS |
99 | else if (dev->type && dev->type->release) |
100 | dev->type->release(dev); | |
2620efef GKH |
101 | else if (dev->class && dev->class->dev_release) |
102 | dev->class->dev_release(dev); | |
1da177e4 LT |
103 | else { |
104 | printk(KERN_ERR "Device '%s' does not have a release() function, " | |
105 | "it is broken and must be fixed.\n", | |
106 | dev->bus_id); | |
107 | WARN_ON(1); | |
108 | } | |
109 | } | |
110 | ||
111 | static struct kobj_type ktype_device = { | |
112 | .release = device_release, | |
113 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
114 | }; |
115 | ||
116 | ||
312c004d | 117 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
118 | { |
119 | struct kobj_type *ktype = get_ktype(kobj); | |
120 | ||
121 | if (ktype == &ktype_device) { | |
122 | struct device *dev = to_dev(kobj); | |
83b5fb4c CH |
123 | if (dev->uevent_suppress) |
124 | return 0; | |
1da177e4 LT |
125 | if (dev->bus) |
126 | return 1; | |
23681e47 GKH |
127 | if (dev->class) |
128 | return 1; | |
1da177e4 LT |
129 | } |
130 | return 0; | |
131 | } | |
132 | ||
312c004d | 133 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
134 | { |
135 | struct device *dev = to_dev(kobj); | |
136 | ||
23681e47 GKH |
137 | if (dev->bus) |
138 | return dev->bus->name; | |
139 | if (dev->class) | |
140 | return dev->class->name; | |
141 | return NULL; | |
1da177e4 LT |
142 | } |
143 | ||
7eff2e7a KS |
144 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
145 | struct kobj_uevent_env *env) | |
1da177e4 LT |
146 | { |
147 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
148 | int retval = 0; |
149 | ||
23681e47 GKH |
150 | /* add the major/minor if present */ |
151 | if (MAJOR(dev->devt)) { | |
7eff2e7a KS |
152 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
153 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
23681e47 GKH |
154 | } |
155 | ||
414264f9 | 156 | if (dev->type && dev->type->name) |
7eff2e7a | 157 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 158 | |
239378f1 | 159 | if (dev->driver) |
7eff2e7a | 160 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 161 | |
a87cb2ac | 162 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
163 | if (dev->class) { |
164 | struct device *parent = dev->parent; | |
165 | ||
166 | /* find first bus device in parent chain */ | |
167 | while (parent && !parent->bus) | |
168 | parent = parent->parent; | |
169 | if (parent && parent->bus) { | |
170 | const char *path; | |
171 | ||
172 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 173 | if (path) { |
7eff2e7a | 174 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
175 | kfree(path); |
176 | } | |
239378f1 | 177 | |
7eff2e7a | 178 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
179 | |
180 | if (parent->driver) | |
7eff2e7a KS |
181 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
182 | parent->driver->name); | |
239378f1 KS |
183 | } |
184 | } else if (dev->bus) { | |
7eff2e7a | 185 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
186 | |
187 | if (dev->driver) | |
7eff2e7a | 188 | add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); |
d81d9d6b | 189 | } |
239378f1 | 190 | #endif |
1da177e4 | 191 | |
7eff2e7a | 192 | /* have the bus specific function add its stuff */ |
312c004d | 193 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 194 | retval = dev->bus->uevent(dev, env); |
f9f852df KS |
195 | if (retval) |
196 | pr_debug ("%s: bus uevent() returned %d\n", | |
1da177e4 | 197 | __FUNCTION__, retval); |
1da177e4 LT |
198 | } |
199 | ||
7eff2e7a | 200 | /* have the class specific function add its stuff */ |
2620efef | 201 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 202 | retval = dev->class->dev_uevent(dev, env); |
f9f852df KS |
203 | if (retval) |
204 | pr_debug("%s: class uevent() returned %d\n", | |
205 | __FUNCTION__, retval); | |
206 | } | |
207 | ||
7eff2e7a | 208 | /* have the device type specific fuction add its stuff */ |
f9f852df | 209 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 210 | retval = dev->type->uevent(dev, env); |
f9f852df KS |
211 | if (retval) |
212 | pr_debug("%s: dev_type uevent() returned %d\n", | |
213 | __FUNCTION__, retval); | |
2620efef GKH |
214 | } |
215 | ||
1da177e4 LT |
216 | return retval; |
217 | } | |
218 | ||
312c004d KS |
219 | static struct kset_uevent_ops device_uevent_ops = { |
220 | .filter = dev_uevent_filter, | |
221 | .name = dev_uevent_name, | |
222 | .uevent = dev_uevent, | |
1da177e4 LT |
223 | }; |
224 | ||
16574dcc KS |
225 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
226 | char *buf) | |
227 | { | |
228 | struct kobject *top_kobj; | |
229 | struct kset *kset; | |
7eff2e7a | 230 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
231 | int i; |
232 | size_t count = 0; | |
233 | int retval; | |
234 | ||
235 | /* search the kset, the device belongs to */ | |
236 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
237 | while (!top_kobj->kset && top_kobj->parent) |
238 | top_kobj = top_kobj->parent; | |
16574dcc KS |
239 | if (!top_kobj->kset) |
240 | goto out; | |
5c5daf65 | 241 | |
16574dcc KS |
242 | kset = top_kobj->kset; |
243 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
244 | goto out; | |
245 | ||
246 | /* respect filter */ | |
247 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
248 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
249 | goto out; | |
250 | ||
7eff2e7a KS |
251 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
252 | if (!env) | |
c7308c81 GKH |
253 | return -ENOMEM; |
254 | ||
16574dcc | 255 | /* let the kset specific function add its keys */ |
7eff2e7a | 256 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
257 | if (retval) |
258 | goto out; | |
259 | ||
260 | /* copy keys to file */ | |
7eff2e7a KS |
261 | for (i = 0; i < env->envp_idx; i++) |
262 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 263 | out: |
7eff2e7a | 264 | kfree(env); |
16574dcc KS |
265 | return count; |
266 | } | |
267 | ||
a7fd6706 KS |
268 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
269 | const char *buf, size_t count) | |
270 | { | |
60a96a59 KS |
271 | enum kobject_action action; |
272 | ||
5c5daf65 | 273 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
274 | kobject_uevent(&dev->kobj, action); |
275 | goto out; | |
276 | } | |
277 | ||
278 | dev_err(dev, "uevent: unsupported action-string; this will " | |
279 | "be ignored in a future kernel version\n"); | |
312c004d | 280 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 281 | out: |
a7fd6706 KS |
282 | return count; |
283 | } | |
284 | ||
ad6a1e1c TH |
285 | static struct device_attribute uevent_attr = |
286 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
287 | ||
621a1672 DT |
288 | static int device_add_attributes(struct device *dev, |
289 | struct device_attribute *attrs) | |
de0ff00d | 290 | { |
621a1672 | 291 | int error = 0; |
de0ff00d | 292 | int i; |
621a1672 DT |
293 | |
294 | if (attrs) { | |
295 | for (i = 0; attr_name(attrs[i]); i++) { | |
296 | error = device_create_file(dev, &attrs[i]); | |
297 | if (error) | |
298 | break; | |
299 | } | |
300 | if (error) | |
301 | while (--i >= 0) | |
302 | device_remove_file(dev, &attrs[i]); | |
303 | } | |
304 | return error; | |
305 | } | |
306 | ||
307 | static void device_remove_attributes(struct device *dev, | |
308 | struct device_attribute *attrs) | |
309 | { | |
310 | int i; | |
311 | ||
312 | if (attrs) | |
313 | for (i = 0; attr_name(attrs[i]); i++) | |
314 | device_remove_file(dev, &attrs[i]); | |
315 | } | |
316 | ||
317 | static int device_add_groups(struct device *dev, | |
318 | struct attribute_group **groups) | |
319 | { | |
de0ff00d | 320 | int error = 0; |
621a1672 | 321 | int i; |
de0ff00d | 322 | |
621a1672 DT |
323 | if (groups) { |
324 | for (i = 0; groups[i]; i++) { | |
325 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
326 | if (error) { |
327 | while (--i >= 0) | |
621a1672 DT |
328 | sysfs_remove_group(&dev->kobj, groups[i]); |
329 | break; | |
de0ff00d GKH |
330 | } |
331 | } | |
332 | } | |
de0ff00d GKH |
333 | return error; |
334 | } | |
335 | ||
621a1672 DT |
336 | static void device_remove_groups(struct device *dev, |
337 | struct attribute_group **groups) | |
de0ff00d GKH |
338 | { |
339 | int i; | |
621a1672 DT |
340 | |
341 | if (groups) | |
342 | for (i = 0; groups[i]; i++) | |
343 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
344 | } |
345 | ||
2620efef GKH |
346 | static int device_add_attrs(struct device *dev) |
347 | { | |
348 | struct class *class = dev->class; | |
f9f852df | 349 | struct device_type *type = dev->type; |
621a1672 | 350 | int error; |
2620efef | 351 | |
621a1672 DT |
352 | if (class) { |
353 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 354 | if (error) |
621a1672 | 355 | return error; |
2620efef | 356 | } |
f9f852df | 357 | |
621a1672 DT |
358 | if (type) { |
359 | error = device_add_groups(dev, type->groups); | |
f9f852df | 360 | if (error) |
621a1672 | 361 | goto err_remove_class_attrs; |
f9f852df KS |
362 | } |
363 | ||
621a1672 DT |
364 | error = device_add_groups(dev, dev->groups); |
365 | if (error) | |
366 | goto err_remove_type_groups; | |
367 | ||
368 | return 0; | |
369 | ||
370 | err_remove_type_groups: | |
371 | if (type) | |
372 | device_remove_groups(dev, type->groups); | |
373 | err_remove_class_attrs: | |
374 | if (class) | |
375 | device_remove_attributes(dev, class->dev_attrs); | |
376 | ||
2620efef GKH |
377 | return error; |
378 | } | |
379 | ||
380 | static void device_remove_attrs(struct device *dev) | |
381 | { | |
382 | struct class *class = dev->class; | |
f9f852df | 383 | struct device_type *type = dev->type; |
2620efef | 384 | |
621a1672 | 385 | device_remove_groups(dev, dev->groups); |
f9f852df | 386 | |
621a1672 DT |
387 | if (type) |
388 | device_remove_groups(dev, type->groups); | |
389 | ||
390 | if (class) | |
391 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
392 | } |
393 | ||
394 | ||
23681e47 GKH |
395 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
396 | char *buf) | |
397 | { | |
398 | return print_dev_t(buf, dev->devt); | |
399 | } | |
400 | ||
ad6a1e1c TH |
401 | static struct device_attribute devt_attr = |
402 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
403 | ||
0863afb3 MW |
404 | /* |
405 | * devices_subsys - structure to be registered with kobject core. | |
1da177e4 LT |
406 | */ |
407 | ||
312c004d | 408 | decl_subsys(devices, &ktype_device, &device_uevent_ops); |
1da177e4 LT |
409 | |
410 | ||
411 | /** | |
412 | * device_create_file - create sysfs attribute file for device. | |
413 | * @dev: device. | |
414 | * @attr: device attribute descriptor. | |
415 | */ | |
416 | ||
417 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
418 | { | |
419 | int error = 0; | |
420 | if (get_device(dev)) { | |
421 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
422 | put_device(dev); | |
423 | } | |
424 | return error; | |
425 | } | |
426 | ||
427 | /** | |
428 | * device_remove_file - remove sysfs attribute file. | |
429 | * @dev: device. | |
430 | * @attr: device attribute descriptor. | |
431 | */ | |
432 | ||
433 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
434 | { | |
435 | if (get_device(dev)) { | |
436 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
437 | put_device(dev); | |
438 | } | |
439 | } | |
440 | ||
2589f188 GKH |
441 | /** |
442 | * device_create_bin_file - create sysfs binary attribute file for device. | |
443 | * @dev: device. | |
444 | * @attr: device binary attribute descriptor. | |
445 | */ | |
446 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
447 | { | |
448 | int error = -EINVAL; | |
449 | if (dev) | |
450 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
451 | return error; | |
452 | } | |
453 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
454 | ||
455 | /** | |
456 | * device_remove_bin_file - remove sysfs binary attribute file | |
457 | * @dev: device. | |
458 | * @attr: device binary attribute descriptor. | |
459 | */ | |
460 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
461 | { | |
462 | if (dev) | |
463 | sysfs_remove_bin_file(&dev->kobj, attr); | |
464 | } | |
465 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
466 | ||
d9a9cdfb | 467 | /** |
523ded71 | 468 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
469 | * @dev: device. |
470 | * @func: callback function to invoke later. | |
523ded71 | 471 | * @owner: module owning the callback routine |
d9a9cdfb AS |
472 | * |
473 | * Attribute methods must not unregister themselves or their parent device | |
474 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
475 | * since unregistration is mutually exclusive with driver callbacks. | |
476 | * | |
477 | * Instead methods can call this routine, which will attempt to allocate | |
478 | * and schedule a workqueue request to call back @func with @dev as its | |
479 | * argument in the workqueue's process context. @dev will be pinned until | |
480 | * @func returns. | |
481 | * | |
523ded71 AS |
482 | * This routine is usually called via the inline device_schedule_callback(), |
483 | * which automatically sets @owner to THIS_MODULE. | |
484 | * | |
d9a9cdfb | 485 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 486 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
487 | * |
488 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
489 | * underlying sysfs routine (since it is intended for use by attribute | |
490 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
491 | */ | |
523ded71 AS |
492 | int device_schedule_callback_owner(struct device *dev, |
493 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
494 | { |
495 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 496 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 497 | } |
523ded71 | 498 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 499 | |
34bb61f9 JB |
500 | static void klist_children_get(struct klist_node *n) |
501 | { | |
502 | struct device *dev = container_of(n, struct device, knode_parent); | |
503 | ||
504 | get_device(dev); | |
505 | } | |
506 | ||
507 | static void klist_children_put(struct klist_node *n) | |
508 | { | |
509 | struct device *dev = container_of(n, struct device, knode_parent); | |
510 | ||
511 | put_device(dev); | |
512 | } | |
513 | ||
1da177e4 LT |
514 | |
515 | /** | |
516 | * device_initialize - init device structure. | |
517 | * @dev: device. | |
518 | * | |
519 | * This prepares the device for use by other layers, | |
520 | * including adding it to the device hierarchy. | |
521 | * It is the first half of device_register(), if called by | |
522 | * that, though it can also be called separately, so one | |
523 | * may use @dev's fields (e.g. the refcount). | |
524 | */ | |
525 | ||
526 | void device_initialize(struct device *dev) | |
527 | { | |
528 | kobj_set_kset_s(dev, devices_subsys); | |
529 | kobject_init(&dev->kobj); | |
34bb61f9 JB |
530 | klist_init(&dev->klist_children, klist_children_get, |
531 | klist_children_put); | |
1da177e4 | 532 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 533 | INIT_LIST_HEAD(&dev->node); |
af70316a | 534 | init_MUTEX(&dev->sem); |
9ac7849e TH |
535 | spin_lock_init(&dev->devres_lock); |
536 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 537 | device_init_wakeup(dev, 0); |
87348136 | 538 | set_dev_node(dev, -1); |
1da177e4 LT |
539 | } |
540 | ||
40fa5422 | 541 | #ifdef CONFIG_SYSFS_DEPRECATED |
c744aeae CH |
542 | static struct kobject * get_device_parent(struct device *dev, |
543 | struct device *parent) | |
40fa5422 | 544 | { |
3eb215de DT |
545 | /* |
546 | * Set the parent to the class, not the parent device | |
547 | * for topmost devices in class hierarchy. | |
548 | * This keeps sysfs from having a symlink to make old | |
549 | * udevs happy | |
550 | */ | |
551 | if (dev->class && (!parent || parent->class != dev->class)) | |
823bccfc | 552 | return &dev->class->subsys.kobj; |
40fa5422 | 553 | else if (parent) |
c744aeae | 554 | return &parent->kobj; |
40fa5422 | 555 | |
c744aeae | 556 | return NULL; |
40fa5422 GKH |
557 | } |
558 | #else | |
86406245 | 559 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 560 | { |
86406245 | 561 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 562 | |
86406245 | 563 | if (!virtual_dir) |
823bccfc | 564 | virtual_dir = kobject_add_dir(&devices_subsys.kobj, "virtual"); |
f0ee61a6 | 565 | |
86406245 | 566 | return virtual_dir; |
f0ee61a6 GKH |
567 | } |
568 | ||
c744aeae CH |
569 | static struct kobject * get_device_parent(struct device *dev, |
570 | struct device *parent) | |
40fa5422 | 571 | { |
86406245 KS |
572 | if (dev->class) { |
573 | struct kobject *kobj = NULL; | |
574 | struct kobject *parent_kobj; | |
575 | struct kobject *k; | |
576 | ||
577 | /* | |
578 | * If we have no parent, we live in "virtual". | |
579 | * Class-devices with a bus-device as parent, live | |
580 | * in a class-directory to prevent namespace collisions. | |
581 | */ | |
582 | if (parent == NULL) | |
583 | parent_kobj = virtual_device_parent(dev); | |
584 | else if (parent->class) | |
585 | return &parent->kobj; | |
586 | else | |
587 | parent_kobj = &parent->kobj; | |
588 | ||
589 | /* find our class-directory at the parent and reference it */ | |
590 | spin_lock(&dev->class->class_dirs.list_lock); | |
591 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
592 | if (k->parent == parent_kobj) { | |
593 | kobj = kobject_get(k); | |
594 | break; | |
595 | } | |
596 | spin_unlock(&dev->class->class_dirs.list_lock); | |
597 | if (kobj) | |
598 | return kobj; | |
599 | ||
600 | /* or create a new class-directory at the parent device */ | |
601 | return kobject_kset_add_dir(&dev->class->class_dirs, | |
602 | parent_kobj, dev->class->name); | |
603 | } | |
604 | ||
605 | if (parent) | |
c744aeae CH |
606 | return &parent->kobj; |
607 | return NULL; | |
608 | } | |
c744aeae | 609 | #endif |
86406245 | 610 | |
c744aeae CH |
611 | static int setup_parent(struct device *dev, struct device *parent) |
612 | { | |
613 | struct kobject *kobj; | |
614 | kobj = get_device_parent(dev, parent); | |
615 | if (IS_ERR(kobj)) | |
616 | return PTR_ERR(kobj); | |
617 | if (kobj) | |
618 | dev->kobj.parent = kobj; | |
40fa5422 GKH |
619 | return 0; |
620 | } | |
40fa5422 | 621 | |
2ee97caf CH |
622 | static int device_add_class_symlinks(struct device *dev) |
623 | { | |
624 | int error; | |
625 | ||
626 | if (!dev->class) | |
627 | return 0; | |
628 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, | |
629 | "subsystem"); | |
630 | if (error) | |
631 | goto out; | |
632 | /* | |
633 | * If this is not a "fake" compatible device, then create the | |
634 | * symlink from the class to the device. | |
635 | */ | |
636 | if (dev->kobj.parent != &dev->class->subsys.kobj) { | |
637 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
638 | dev->bus_id); | |
639 | if (error) | |
640 | goto out_subsys; | |
641 | } | |
27907689 | 642 | if (dev->parent) { |
2ee97caf CH |
643 | #ifdef CONFIG_SYSFS_DEPRECATED |
644 | { | |
4f01a757 DT |
645 | struct device *parent = dev->parent; |
646 | char *class_name; | |
647 | ||
648 | /* | |
649 | * In old sysfs stacked class devices had 'device' | |
650 | * link pointing to real device instead of parent | |
651 | */ | |
652 | while (parent->class && !parent->bus && parent->parent) | |
653 | parent = parent->parent; | |
654 | ||
655 | error = sysfs_create_link(&dev->kobj, | |
656 | &parent->kobj, | |
657 | "device"); | |
658 | if (error) | |
659 | goto out_busid; | |
660 | ||
661 | class_name = make_class_name(dev->class->name, | |
662 | &dev->kobj); | |
2ee97caf CH |
663 | if (class_name) |
664 | error = sysfs_create_link(&dev->parent->kobj, | |
665 | &dev->kobj, class_name); | |
666 | kfree(class_name); | |
667 | if (error) | |
668 | goto out_device; | |
669 | } | |
4f01a757 DT |
670 | #else |
671 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, | |
672 | "device"); | |
673 | if (error) | |
674 | goto out_busid; | |
2ee97caf CH |
675 | #endif |
676 | } | |
677 | return 0; | |
678 | ||
679 | #ifdef CONFIG_SYSFS_DEPRECATED | |
680 | out_device: | |
681 | if (dev->parent) | |
682 | sysfs_remove_link(&dev->kobj, "device"); | |
683 | #endif | |
684 | out_busid: | |
685 | if (dev->kobj.parent != &dev->class->subsys.kobj) | |
686 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
687 | out_subsys: | |
688 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
689 | out: | |
690 | return error; | |
691 | } | |
692 | ||
693 | static void device_remove_class_symlinks(struct device *dev) | |
694 | { | |
695 | if (!dev->class) | |
696 | return; | |
697 | if (dev->parent) { | |
698 | #ifdef CONFIG_SYSFS_DEPRECATED | |
699 | char *class_name; | |
700 | ||
701 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
702 | if (class_name) { | |
703 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
704 | kfree(class_name); | |
705 | } | |
706 | #endif | |
707 | sysfs_remove_link(&dev->kobj, "device"); | |
708 | } | |
709 | if (dev->kobj.parent != &dev->class->subsys.kobj) | |
710 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
711 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
712 | } | |
713 | ||
1da177e4 LT |
714 | /** |
715 | * device_add - add device to device hierarchy. | |
716 | * @dev: device. | |
717 | * | |
718 | * This is part 2 of device_register(), though may be called | |
719 | * separately _iff_ device_initialize() has been called separately. | |
720 | * | |
721 | * This adds it to the kobject hierarchy via kobject_add(), adds it | |
722 | * to the global and sibling lists for the device, then | |
723 | * adds it to the other relevant subsystems of the driver model. | |
724 | */ | |
725 | int device_add(struct device *dev) | |
726 | { | |
727 | struct device *parent = NULL; | |
c47ed219 | 728 | struct class_interface *class_intf; |
1da177e4 LT |
729 | int error = -EINVAL; |
730 | ||
731 | dev = get_device(dev); | |
732 | if (!dev || !strlen(dev->bus_id)) | |
733 | goto Error; | |
734 | ||
40fa5422 | 735 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); |
c205ef48 | 736 | |
1da177e4 | 737 | parent = get_device(dev->parent); |
40fa5422 GKH |
738 | error = setup_parent(dev, parent); |
739 | if (error) | |
740 | goto Error; | |
1da177e4 LT |
741 | |
742 | /* first, register with generic layer. */ | |
743 | kobject_set_name(&dev->kobj, "%s", dev->bus_id); | |
40fa5422 GKH |
744 | error = kobject_add(&dev->kobj); |
745 | if (error) | |
1da177e4 | 746 | goto Error; |
a7fd6706 | 747 | |
37022644 BW |
748 | /* notify platform of device entry */ |
749 | if (platform_notify) | |
750 | platform_notify(dev); | |
751 | ||
116af378 BH |
752 | /* notify clients of device entry (new way) */ |
753 | if (dev->bus) | |
754 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
755 | BUS_NOTIFY_ADD_DEVICE, dev); | |
756 | ||
ad6a1e1c | 757 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
758 | if (error) |
759 | goto attrError; | |
a7fd6706 | 760 | |
23681e47 | 761 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
762 | error = device_create_file(dev, &devt_attr); |
763 | if (error) | |
a306eea4 | 764 | goto ueventattrError; |
23681e47 GKH |
765 | } |
766 | ||
2ee97caf CH |
767 | error = device_add_class_symlinks(dev); |
768 | if (error) | |
769 | goto SymlinkError; | |
dc0afa83 CH |
770 | error = device_add_attrs(dev); |
771 | if (error) | |
2620efef | 772 | goto AttrsError; |
dc0afa83 CH |
773 | error = device_pm_add(dev); |
774 | if (error) | |
1da177e4 | 775 | goto PMError; |
dc0afa83 CH |
776 | error = bus_add_device(dev); |
777 | if (error) | |
1da177e4 | 778 | goto BusError; |
83b5fb4c | 779 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 780 | bus_attach_device(dev); |
1da177e4 | 781 | if (parent) |
d856f1e3 | 782 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 783 | |
5d9fd169 | 784 | if (dev->class) { |
5d9fd169 | 785 | down(&dev->class->sem); |
c47ed219 | 786 | /* tie the class to the device */ |
5d9fd169 | 787 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
788 | |
789 | /* notify any interfaces that the device is here */ | |
790 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
791 | if (class_intf->add_dev) | |
792 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
793 | up(&dev->class->sem); |
794 | } | |
1da177e4 LT |
795 | Done: |
796 | put_device(dev); | |
797 | return error; | |
798 | BusError: | |
799 | device_pm_remove(dev); | |
800 | PMError: | |
116af378 BH |
801 | if (dev->bus) |
802 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
803 | BUS_NOTIFY_DEL_DEVICE, dev); | |
82f0cf9b | 804 | device_remove_attrs(dev); |
2620efef | 805 | AttrsError: |
2ee97caf CH |
806 | device_remove_class_symlinks(dev); |
807 | SymlinkError: | |
ad6a1e1c TH |
808 | if (MAJOR(dev->devt)) |
809 | device_remove_file(dev, &devt_attr); | |
82f0cf9b JS |
810 | |
811 | if (dev->class) { | |
812 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
813 | /* If this is not a "fake" compatible device, remove the | |
814 | * symlink from the class to the device. */ | |
823bccfc GKH |
815 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
816 | sysfs_remove_link(&dev->class->subsys.kobj, | |
82f0cf9b | 817 | dev->bus_id); |
82f0cf9b | 818 | if (parent) { |
f7f3461d | 819 | #ifdef CONFIG_SYSFS_DEPRECATED |
82f0cf9b JS |
820 | char *class_name = make_class_name(dev->class->name, |
821 | &dev->kobj); | |
822 | if (class_name) | |
823 | sysfs_remove_link(&dev->parent->kobj, | |
824 | class_name); | |
825 | kfree(class_name); | |
f7f3461d | 826 | #endif |
82f0cf9b JS |
827 | sysfs_remove_link(&dev->kobj, "device"); |
828 | } | |
82f0cf9b | 829 | } |
a306eea4 | 830 | ueventattrError: |
ad6a1e1c | 831 | device_remove_file(dev, &uevent_attr); |
23681e47 | 832 | attrError: |
312c004d | 833 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
834 | kobject_del(&dev->kobj); |
835 | Error: | |
836 | if (parent) | |
837 | put_device(parent); | |
838 | goto Done; | |
839 | } | |
840 | ||
841 | ||
842 | /** | |
843 | * device_register - register a device with the system. | |
844 | * @dev: pointer to the device structure | |
845 | * | |
846 | * This happens in two clean steps - initialize the device | |
847 | * and add it to the system. The two steps can be called | |
848 | * separately, but this is the easiest and most common. | |
849 | * I.e. you should only call the two helpers separately if | |
850 | * have a clearly defined need to use and refcount the device | |
851 | * before it is added to the hierarchy. | |
852 | */ | |
853 | ||
854 | int device_register(struct device *dev) | |
855 | { | |
856 | device_initialize(dev); | |
857 | return device_add(dev); | |
858 | } | |
859 | ||
860 | ||
861 | /** | |
862 | * get_device - increment reference count for device. | |
863 | * @dev: device. | |
864 | * | |
865 | * This simply forwards the call to kobject_get(), though | |
866 | * we do take care to provide for the case that we get a NULL | |
867 | * pointer passed in. | |
868 | */ | |
869 | ||
870 | struct device * get_device(struct device * dev) | |
871 | { | |
872 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
873 | } | |
874 | ||
875 | ||
876 | /** | |
877 | * put_device - decrement reference count. | |
878 | * @dev: device in question. | |
879 | */ | |
880 | void put_device(struct device * dev) | |
881 | { | |
882 | if (dev) | |
883 | kobject_put(&dev->kobj); | |
884 | } | |
885 | ||
886 | ||
887 | /** | |
888 | * device_del - delete device from system. | |
889 | * @dev: device. | |
890 | * | |
891 | * This is the first part of the device unregistration | |
892 | * sequence. This removes the device from the lists we control | |
893 | * from here, has it removed from the other driver model | |
894 | * subsystems it was added to in device_add(), and removes it | |
895 | * from the kobject hierarchy. | |
896 | * | |
897 | * NOTE: this should be called manually _iff_ device_add() was | |
898 | * also called manually. | |
899 | */ | |
900 | ||
901 | void device_del(struct device * dev) | |
902 | { | |
903 | struct device * parent = dev->parent; | |
c47ed219 | 904 | struct class_interface *class_intf; |
1da177e4 | 905 | |
1da177e4 | 906 | if (parent) |
d62c0f9f | 907 | klist_del(&dev->knode_parent); |
ad6a1e1c TH |
908 | if (MAJOR(dev->devt)) |
909 | device_remove_file(dev, &devt_attr); | |
b9d9c82b KS |
910 | if (dev->class) { |
911 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
40fa5422 GKH |
912 | /* If this is not a "fake" compatible device, remove the |
913 | * symlink from the class to the device. */ | |
823bccfc GKH |
914 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
915 | sysfs_remove_link(&dev->class->subsys.kobj, | |
40fa5422 | 916 | dev->bus_id); |
64bb5d2c | 917 | if (parent) { |
f7f3461d | 918 | #ifdef CONFIG_SYSFS_DEPRECATED |
99ef3ef8 KS |
919 | char *class_name = make_class_name(dev->class->name, |
920 | &dev->kobj); | |
cb360bbf CH |
921 | if (class_name) |
922 | sysfs_remove_link(&dev->parent->kobj, | |
923 | class_name); | |
99ef3ef8 | 924 | kfree(class_name); |
f7f3461d | 925 | #endif |
99ef3ef8 | 926 | sysfs_remove_link(&dev->kobj, "device"); |
64bb5d2c | 927 | } |
99ef3ef8 | 928 | |
5d9fd169 | 929 | down(&dev->class->sem); |
c47ed219 GKH |
930 | /* notify any interfaces that the device is now gone */ |
931 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
932 | if (class_intf->remove_dev) | |
933 | class_intf->remove_dev(dev, class_intf); | |
934 | /* remove the device from the class list */ | |
5d9fd169 GKH |
935 | list_del_init(&dev->node); |
936 | up(&dev->class->sem); | |
86406245 KS |
937 | |
938 | /* If we live in a parent class-directory, unreference it */ | |
939 | if (dev->kobj.parent->kset == &dev->class->class_dirs) { | |
940 | struct device *d; | |
941 | int other = 0; | |
942 | ||
943 | /* | |
944 | * if we are the last child of our class, delete | |
945 | * our class-directory at this parent | |
946 | */ | |
947 | down(&dev->class->sem); | |
948 | list_for_each_entry(d, &dev->class->devices, node) { | |
949 | if (d == dev) | |
950 | continue; | |
951 | if (d->kobj.parent == dev->kobj.parent) { | |
952 | other = 1; | |
953 | break; | |
954 | } | |
955 | } | |
956 | if (!other) | |
957 | kobject_del(dev->kobj.parent); | |
958 | ||
959 | kobject_put(dev->kobj.parent); | |
960 | up(&dev->class->sem); | |
961 | } | |
b9d9c82b | 962 | } |
ad6a1e1c | 963 | device_remove_file(dev, &uevent_attr); |
2620efef | 964 | device_remove_attrs(dev); |
28953533 | 965 | bus_remove_device(dev); |
1da177e4 | 966 | |
2f8d16a9 TH |
967 | /* |
968 | * Some platform devices are driven without driver attached | |
969 | * and managed resources may have been acquired. Make sure | |
970 | * all resources are released. | |
971 | */ | |
972 | devres_release_all(dev); | |
973 | ||
1da177e4 LT |
974 | /* Notify the platform of the removal, in case they |
975 | * need to do anything... | |
976 | */ | |
977 | if (platform_notify_remove) | |
978 | platform_notify_remove(dev); | |
116af378 BH |
979 | if (dev->bus) |
980 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
981 | BUS_NOTIFY_DEL_DEVICE, dev); | |
1da177e4 | 982 | device_pm_remove(dev); |
312c004d | 983 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
984 | kobject_del(&dev->kobj); |
985 | if (parent) | |
986 | put_device(parent); | |
987 | } | |
988 | ||
989 | /** | |
990 | * device_unregister - unregister device from system. | |
991 | * @dev: device going away. | |
992 | * | |
993 | * We do this in two parts, like we do device_register(). First, | |
994 | * we remove it from all the subsystems with device_del(), then | |
995 | * we decrement the reference count via put_device(). If that | |
996 | * is the final reference count, the device will be cleaned up | |
997 | * via device_release() above. Otherwise, the structure will | |
998 | * stick around until the final reference to the device is dropped. | |
999 | */ | |
1000 | void device_unregister(struct device * dev) | |
1001 | { | |
1002 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); | |
1003 | device_del(dev); | |
1004 | put_device(dev); | |
1005 | } | |
1006 | ||
1007 | ||
36239577 | 1008 | static struct device * next_device(struct klist_iter * i) |
1009 | { | |
1010 | struct klist_node * n = klist_next(i); | |
1011 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
1012 | } | |
1013 | ||
1da177e4 LT |
1014 | /** |
1015 | * device_for_each_child - device child iterator. | |
c41455fb | 1016 | * @parent: parent struct device. |
1da177e4 LT |
1017 | * @data: data for the callback. |
1018 | * @fn: function to be called for each device. | |
1019 | * | |
c41455fb | 1020 | * Iterate over @parent's child devices, and call @fn for each, |
1da177e4 LT |
1021 | * passing it @data. |
1022 | * | |
1023 | * We check the return of @fn each time. If it returns anything | |
1024 | * other than 0, we break out and return that value. | |
1025 | */ | |
36239577 | 1026 | int device_for_each_child(struct device * parent, void * data, |
1da177e4 LT |
1027 | int (*fn)(struct device *, void *)) |
1028 | { | |
36239577 | 1029 | struct klist_iter i; |
1da177e4 LT |
1030 | struct device * child; |
1031 | int error = 0; | |
1032 | ||
36239577 | 1033 | klist_iter_init(&parent->klist_children, &i); |
1034 | while ((child = next_device(&i)) && !error) | |
1035 | error = fn(child, data); | |
1036 | klist_iter_exit(&i); | |
1da177e4 LT |
1037 | return error; |
1038 | } | |
1039 | ||
5ab69981 CH |
1040 | /** |
1041 | * device_find_child - device iterator for locating a particular device. | |
1042 | * @parent: parent struct device | |
1043 | * @data: Data to pass to match function | |
1044 | * @match: Callback function to check device | |
1045 | * | |
1046 | * This is similar to the device_for_each_child() function above, but it | |
1047 | * returns a reference to a device that is 'found' for later use, as | |
1048 | * determined by the @match callback. | |
1049 | * | |
1050 | * The callback should return 0 if the device doesn't match and non-zero | |
1051 | * if it does. If the callback returns non-zero and a reference to the | |
1052 | * current device can be obtained, this function will return to the caller | |
1053 | * and not iterate over any more devices. | |
1054 | */ | |
1055 | struct device * device_find_child(struct device *parent, void *data, | |
1056 | int (*match)(struct device *, void *)) | |
1057 | { | |
1058 | struct klist_iter i; | |
1059 | struct device *child; | |
1060 | ||
1061 | if (!parent) | |
1062 | return NULL; | |
1063 | ||
1064 | klist_iter_init(&parent->klist_children, &i); | |
1065 | while ((child = next_device(&i))) | |
1066 | if (match(child, data) && get_device(child)) | |
1067 | break; | |
1068 | klist_iter_exit(&i); | |
1069 | return child; | |
1070 | } | |
1071 | ||
1da177e4 LT |
1072 | int __init devices_init(void) |
1073 | { | |
1074 | return subsystem_register(&devices_subsys); | |
1075 | } | |
1076 | ||
1077 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1078 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1079 | |
1080 | EXPORT_SYMBOL_GPL(device_initialize); | |
1081 | EXPORT_SYMBOL_GPL(device_add); | |
1082 | EXPORT_SYMBOL_GPL(device_register); | |
1083 | ||
1084 | EXPORT_SYMBOL_GPL(device_del); | |
1085 | EXPORT_SYMBOL_GPL(device_unregister); | |
1086 | EXPORT_SYMBOL_GPL(get_device); | |
1087 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1088 | |
1089 | EXPORT_SYMBOL_GPL(device_create_file); | |
1090 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1091 | |
1092 | ||
1093 | static void device_create_release(struct device *dev) | |
1094 | { | |
1095 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); | |
1096 | kfree(dev); | |
1097 | } | |
1098 | ||
1099 | /** | |
1100 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1101 | * @class: pointer to the struct class that this device should be registered to |
1102 | * @parent: pointer to the parent struct device of this new device, if any | |
1103 | * @devt: the dev_t for the char device to be added | |
1104 | * @fmt: string for the device's name | |
1105 | * | |
1106 | * This function can be used by char device classes. A struct device | |
1107 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1108 | * |
23681e47 GKH |
1109 | * A "dev" file will be created, showing the dev_t for the device, if |
1110 | * the dev_t is not 0,0. | |
42734daf HK |
1111 | * If a pointer to a parent struct device is passed in, the newly created |
1112 | * struct device will be a child of that device in sysfs. | |
1113 | * The pointer to the struct device will be returned from the call. | |
1114 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1115 | * pointer. |
1116 | * | |
1117 | * Note: the struct class passed to this function must have previously | |
1118 | * been created with a call to class_create(). | |
1119 | */ | |
1120 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1121 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1122 | { |
1123 | va_list args; | |
1124 | struct device *dev = NULL; | |
1125 | int retval = -ENODEV; | |
1126 | ||
1127 | if (class == NULL || IS_ERR(class)) | |
1128 | goto error; | |
23681e47 GKH |
1129 | |
1130 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1131 | if (!dev) { | |
1132 | retval = -ENOMEM; | |
1133 | goto error; | |
1134 | } | |
1135 | ||
1136 | dev->devt = devt; | |
1137 | dev->class = class; | |
1138 | dev->parent = parent; | |
1139 | dev->release = device_create_release; | |
1140 | ||
1141 | va_start(args, fmt); | |
1142 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1143 | va_end(args); | |
1144 | retval = device_register(dev); | |
1145 | if (retval) | |
1146 | goto error; | |
1147 | ||
23681e47 GKH |
1148 | return dev; |
1149 | ||
1150 | error: | |
1151 | kfree(dev); | |
1152 | return ERR_PTR(retval); | |
1153 | } | |
1154 | EXPORT_SYMBOL_GPL(device_create); | |
1155 | ||
1156 | /** | |
1157 | * device_destroy - removes a device that was created with device_create() | |
42734daf HK |
1158 | * @class: pointer to the struct class that this device was registered with |
1159 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 1160 | * |
42734daf HK |
1161 | * This call unregisters and cleans up a device that was created with a |
1162 | * call to device_create(). | |
23681e47 GKH |
1163 | */ |
1164 | void device_destroy(struct class *class, dev_t devt) | |
1165 | { | |
1166 | struct device *dev = NULL; | |
1167 | struct device *dev_tmp; | |
1168 | ||
1169 | down(&class->sem); | |
1170 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1171 | if (dev_tmp->devt == devt) { | |
1172 | dev = dev_tmp; | |
1173 | break; | |
1174 | } | |
1175 | } | |
1176 | up(&class->sem); | |
1177 | ||
5d9fd169 | 1178 | if (dev) |
23681e47 | 1179 | device_unregister(dev); |
23681e47 GKH |
1180 | } |
1181 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1182 | |
1183 | /** | |
1184 | * device_rename - renames a device | |
1185 | * @dev: the pointer to the struct device to be renamed | |
1186 | * @new_name: the new name of the device | |
1187 | */ | |
1188 | int device_rename(struct device *dev, char *new_name) | |
1189 | { | |
1190 | char *old_class_name = NULL; | |
1191 | char *new_class_name = NULL; | |
2ee97caf | 1192 | char *old_device_name = NULL; |
a2de48ca GKH |
1193 | int error; |
1194 | ||
1195 | dev = get_device(dev); | |
1196 | if (!dev) | |
1197 | return -EINVAL; | |
1198 | ||
1199 | pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); | |
1200 | ||
99ef3ef8 | 1201 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1202 | if ((dev->class) && (dev->parent)) |
1203 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1204 | #endif |
a2de48ca | 1205 | |
2ee97caf CH |
1206 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1207 | if (!old_device_name) { | |
1208 | error = -ENOMEM; | |
1209 | goto out; | |
a2de48ca | 1210 | } |
2ee97caf | 1211 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1212 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1213 | ||
1214 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1215 | if (error) { |
1216 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1217 | goto out; | |
1218 | } | |
a2de48ca | 1219 | |
99ef3ef8 | 1220 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1221 | if (old_class_name) { |
1222 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1223 | if (new_class_name) { | |
2ee97caf CH |
1224 | error = sysfs_create_link(&dev->parent->kobj, |
1225 | &dev->kobj, new_class_name); | |
1226 | if (error) | |
1227 | goto out; | |
a2de48ca GKH |
1228 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1229 | } | |
1230 | } | |
99ef3ef8 KS |
1231 | #endif |
1232 | ||
a2de48ca | 1233 | if (dev->class) { |
2ee97caf CH |
1234 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
1235 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
1236 | dev->bus_id); | |
1237 | if (error) { | |
1238 | /* Uh... how to unravel this if restoring can fail? */ | |
1239 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", | |
1240 | __FUNCTION__, error); | |
1241 | } | |
a2de48ca | 1242 | } |
2ee97caf | 1243 | out: |
a2de48ca GKH |
1244 | put_device(dev); |
1245 | ||
a2de48ca | 1246 | kfree(new_class_name); |
952ab431 | 1247 | kfree(old_class_name); |
2ee97caf | 1248 | kfree(old_device_name); |
a2de48ca GKH |
1249 | |
1250 | return error; | |
1251 | } | |
a2807dbc | 1252 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1253 | |
1254 | static int device_move_class_links(struct device *dev, | |
1255 | struct device *old_parent, | |
1256 | struct device *new_parent) | |
1257 | { | |
f7f3461d | 1258 | int error = 0; |
8a82472f | 1259 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1260 | char *class_name; |
1261 | ||
1262 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1263 | if (!class_name) { | |
cb360bbf | 1264 | error = -ENOMEM; |
8a82472f CH |
1265 | goto out; |
1266 | } | |
1267 | if (old_parent) { | |
1268 | sysfs_remove_link(&dev->kobj, "device"); | |
1269 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1270 | } | |
c744aeae CH |
1271 | if (new_parent) { |
1272 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1273 | "device"); | |
1274 | if (error) | |
1275 | goto out; | |
1276 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1277 | class_name); | |
1278 | if (error) | |
1279 | sysfs_remove_link(&dev->kobj, "device"); | |
1280 | } | |
1281 | else | |
1282 | error = 0; | |
8a82472f CH |
1283 | out: |
1284 | kfree(class_name); | |
1285 | return error; | |
1286 | #else | |
f7f3461d GKH |
1287 | if (old_parent) |
1288 | sysfs_remove_link(&dev->kobj, "device"); | |
1289 | if (new_parent) | |
1290 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1291 | "device"); | |
1292 | return error; | |
8a82472f CH |
1293 | #endif |
1294 | } | |
1295 | ||
1296 | /** | |
1297 | * device_move - moves a device to a new parent | |
1298 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1299 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1300 | */ |
1301 | int device_move(struct device *dev, struct device *new_parent) | |
1302 | { | |
1303 | int error; | |
1304 | struct device *old_parent; | |
c744aeae | 1305 | struct kobject *new_parent_kobj; |
8a82472f CH |
1306 | |
1307 | dev = get_device(dev); | |
1308 | if (!dev) | |
1309 | return -EINVAL; | |
1310 | ||
8a82472f | 1311 | new_parent = get_device(new_parent); |
c744aeae CH |
1312 | new_parent_kobj = get_device_parent (dev, new_parent); |
1313 | if (IS_ERR(new_parent_kobj)) { | |
1314 | error = PTR_ERR(new_parent_kobj); | |
1315 | put_device(new_parent); | |
8a82472f CH |
1316 | goto out; |
1317 | } | |
1318 | pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, | |
c744aeae CH |
1319 | new_parent ? new_parent->bus_id : "<NULL>"); |
1320 | error = kobject_move(&dev->kobj, new_parent_kobj); | |
8a82472f CH |
1321 | if (error) { |
1322 | put_device(new_parent); | |
1323 | goto out; | |
1324 | } | |
1325 | old_parent = dev->parent; | |
1326 | dev->parent = new_parent; | |
1327 | if (old_parent) | |
acf02d23 | 1328 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1329 | if (new_parent) |
1330 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1331 | if (!dev->class) |
1332 | goto out_put; | |
1333 | error = device_move_class_links(dev, old_parent, new_parent); | |
1334 | if (error) { | |
1335 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1336 | device_move_class_links(dev, new_parent, old_parent); | |
1337 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1338 | if (new_parent) |
1339 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1340 | if (old_parent) |
1341 | klist_add_tail(&dev->knode_parent, | |
1342 | &old_parent->klist_children); | |
1343 | } | |
1344 | put_device(new_parent); | |
1345 | goto out; | |
1346 | } | |
1347 | out_put: | |
1348 | put_device(old_parent); | |
1349 | out: | |
1350 | put_device(dev); | |
1351 | return error; | |
1352 | } | |
1353 | ||
1354 | EXPORT_SYMBOL_GPL(device_move); |