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 | ||
312c004d | 144 | static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
145 | int num_envp, char *buffer, int buffer_size) |
146 | { | |
147 | struct device *dev = to_dev(kobj); | |
148 | int i = 0; | |
149 | int length = 0; | |
150 | int retval = 0; | |
151 | ||
23681e47 GKH |
152 | /* add the major/minor if present */ |
153 | if (MAJOR(dev->devt)) { | |
154 | add_uevent_var(envp, num_envp, &i, | |
155 | buffer, buffer_size, &length, | |
156 | "MAJOR=%u", MAJOR(dev->devt)); | |
157 | add_uevent_var(envp, num_envp, &i, | |
158 | buffer, buffer_size, &length, | |
159 | "MINOR=%u", MINOR(dev->devt)); | |
160 | } | |
161 | ||
414264f9 KS |
162 | if (dev->type && dev->type->name) |
163 | add_uevent_var(envp, num_envp, &i, | |
164 | buffer, buffer_size, &length, | |
165 | "DEVTYPE=%s", dev->type->name); | |
166 | ||
239378f1 | 167 | if (dev->driver) |
d81d9d6b KS |
168 | add_uevent_var(envp, num_envp, &i, |
169 | buffer, buffer_size, &length, | |
170 | "DRIVER=%s", dev->driver->name); | |
239378f1 | 171 | |
a87cb2ac | 172 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
173 | if (dev->class) { |
174 | struct device *parent = dev->parent; | |
175 | ||
176 | /* find first bus device in parent chain */ | |
177 | while (parent && !parent->bus) | |
178 | parent = parent->parent; | |
179 | if (parent && parent->bus) { | |
180 | const char *path; | |
181 | ||
182 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
183 | add_uevent_var(envp, num_envp, &i, | |
184 | buffer, buffer_size, &length, | |
185 | "PHYSDEVPATH=%s", path); | |
186 | kfree(path); | |
187 | ||
188 | add_uevent_var(envp, num_envp, &i, | |
189 | buffer, buffer_size, &length, | |
190 | "PHYSDEVBUS=%s", parent->bus->name); | |
191 | ||
192 | if (parent->driver) | |
193 | add_uevent_var(envp, num_envp, &i, | |
194 | buffer, buffer_size, &length, | |
195 | "PHYSDEVDRIVER=%s", parent->driver->name); | |
196 | } | |
197 | } else if (dev->bus) { | |
312c004d KS |
198 | add_uevent_var(envp, num_envp, &i, |
199 | buffer, buffer_size, &length, | |
239378f1 KS |
200 | "PHYSDEVBUS=%s", dev->bus->name); |
201 | ||
202 | if (dev->driver) | |
203 | add_uevent_var(envp, num_envp, &i, | |
204 | buffer, buffer_size, &length, | |
205 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
d81d9d6b | 206 | } |
239378f1 | 207 | #endif |
1da177e4 LT |
208 | |
209 | /* terminate, set to next free slot, shrink available space */ | |
210 | envp[i] = NULL; | |
211 | envp = &envp[i]; | |
212 | num_envp -= i; | |
213 | buffer = &buffer[length]; | |
214 | buffer_size -= length; | |
215 | ||
312c004d | 216 | if (dev->bus && dev->bus->uevent) { |
1da177e4 | 217 | /* have the bus specific function add its stuff */ |
312c004d | 218 | retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size); |
f9f852df KS |
219 | if (retval) |
220 | pr_debug ("%s: bus uevent() returned %d\n", | |
1da177e4 | 221 | __FUNCTION__, retval); |
1da177e4 LT |
222 | } |
223 | ||
2620efef GKH |
224 | if (dev->class && dev->class->dev_uevent) { |
225 | /* have the class specific function add its stuff */ | |
226 | retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size); | |
f9f852df KS |
227 | if (retval) |
228 | pr_debug("%s: class uevent() returned %d\n", | |
229 | __FUNCTION__, retval); | |
230 | } | |
231 | ||
232 | if (dev->type && dev->type->uevent) { | |
233 | /* have the device type specific fuction add its stuff */ | |
234 | retval = dev->type->uevent(dev, envp, num_envp, buffer, buffer_size); | |
235 | if (retval) | |
236 | pr_debug("%s: dev_type uevent() returned %d\n", | |
237 | __FUNCTION__, retval); | |
2620efef GKH |
238 | } |
239 | ||
1da177e4 LT |
240 | return retval; |
241 | } | |
242 | ||
312c004d KS |
243 | static struct kset_uevent_ops device_uevent_ops = { |
244 | .filter = dev_uevent_filter, | |
245 | .name = dev_uevent_name, | |
246 | .uevent = dev_uevent, | |
1da177e4 LT |
247 | }; |
248 | ||
16574dcc KS |
249 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
250 | char *buf) | |
251 | { | |
252 | struct kobject *top_kobj; | |
253 | struct kset *kset; | |
254 | char *envp[32]; | |
255 | char data[PAGE_SIZE]; | |
256 | char *pos; | |
257 | int i; | |
258 | size_t count = 0; | |
259 | int retval; | |
260 | ||
261 | /* search the kset, the device belongs to */ | |
262 | top_kobj = &dev->kobj; | |
263 | if (!top_kobj->kset && top_kobj->parent) { | |
264 | do { | |
265 | top_kobj = top_kobj->parent; | |
266 | } while (!top_kobj->kset && top_kobj->parent); | |
267 | } | |
268 | if (!top_kobj->kset) | |
269 | goto out; | |
270 | kset = top_kobj->kset; | |
271 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
272 | goto out; | |
273 | ||
274 | /* respect filter */ | |
275 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
276 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
277 | goto out; | |
278 | ||
279 | /* let the kset specific function add its keys */ | |
280 | pos = data; | |
281 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, | |
282 | envp, ARRAY_SIZE(envp), | |
283 | pos, PAGE_SIZE); | |
284 | if (retval) | |
285 | goto out; | |
286 | ||
287 | /* copy keys to file */ | |
288 | for (i = 0; envp[i]; i++) { | |
289 | pos = &buf[count]; | |
290 | count += sprintf(pos, "%s\n", envp[i]); | |
291 | } | |
292 | out: | |
293 | return count; | |
294 | } | |
295 | ||
a7fd6706 KS |
296 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
297 | const char *buf, size_t count) | |
298 | { | |
312c004d | 299 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
300 | return count; |
301 | } | |
302 | ||
621a1672 DT |
303 | static int device_add_attributes(struct device *dev, |
304 | struct device_attribute *attrs) | |
de0ff00d | 305 | { |
621a1672 | 306 | int error = 0; |
de0ff00d | 307 | int i; |
621a1672 DT |
308 | |
309 | if (attrs) { | |
310 | for (i = 0; attr_name(attrs[i]); i++) { | |
311 | error = device_create_file(dev, &attrs[i]); | |
312 | if (error) | |
313 | break; | |
314 | } | |
315 | if (error) | |
316 | while (--i >= 0) | |
317 | device_remove_file(dev, &attrs[i]); | |
318 | } | |
319 | return error; | |
320 | } | |
321 | ||
322 | static void device_remove_attributes(struct device *dev, | |
323 | struct device_attribute *attrs) | |
324 | { | |
325 | int i; | |
326 | ||
327 | if (attrs) | |
328 | for (i = 0; attr_name(attrs[i]); i++) | |
329 | device_remove_file(dev, &attrs[i]); | |
330 | } | |
331 | ||
332 | static int device_add_groups(struct device *dev, | |
333 | struct attribute_group **groups) | |
334 | { | |
de0ff00d | 335 | int error = 0; |
621a1672 | 336 | int i; |
de0ff00d | 337 | |
621a1672 DT |
338 | if (groups) { |
339 | for (i = 0; groups[i]; i++) { | |
340 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
341 | if (error) { |
342 | while (--i >= 0) | |
621a1672 DT |
343 | sysfs_remove_group(&dev->kobj, groups[i]); |
344 | break; | |
de0ff00d GKH |
345 | } |
346 | } | |
347 | } | |
de0ff00d GKH |
348 | return error; |
349 | } | |
350 | ||
621a1672 DT |
351 | static void device_remove_groups(struct device *dev, |
352 | struct attribute_group **groups) | |
de0ff00d GKH |
353 | { |
354 | int i; | |
621a1672 DT |
355 | |
356 | if (groups) | |
357 | for (i = 0; groups[i]; i++) | |
358 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
359 | } |
360 | ||
2620efef GKH |
361 | static int device_add_attrs(struct device *dev) |
362 | { | |
363 | struct class *class = dev->class; | |
f9f852df | 364 | struct device_type *type = dev->type; |
621a1672 | 365 | int error; |
2620efef | 366 | |
621a1672 DT |
367 | if (class) { |
368 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 369 | if (error) |
621a1672 | 370 | return error; |
2620efef | 371 | } |
f9f852df | 372 | |
621a1672 DT |
373 | if (type) { |
374 | error = device_add_groups(dev, type->groups); | |
f9f852df | 375 | if (error) |
621a1672 | 376 | goto err_remove_class_attrs; |
f9f852df KS |
377 | } |
378 | ||
621a1672 DT |
379 | error = device_add_groups(dev, dev->groups); |
380 | if (error) | |
381 | goto err_remove_type_groups; | |
382 | ||
383 | return 0; | |
384 | ||
385 | err_remove_type_groups: | |
386 | if (type) | |
387 | device_remove_groups(dev, type->groups); | |
388 | err_remove_class_attrs: | |
389 | if (class) | |
390 | device_remove_attributes(dev, class->dev_attrs); | |
391 | ||
2620efef GKH |
392 | return error; |
393 | } | |
394 | ||
395 | static void device_remove_attrs(struct device *dev) | |
396 | { | |
397 | struct class *class = dev->class; | |
f9f852df | 398 | struct device_type *type = dev->type; |
2620efef | 399 | |
621a1672 | 400 | device_remove_groups(dev, dev->groups); |
f9f852df | 401 | |
621a1672 DT |
402 | if (type) |
403 | device_remove_groups(dev, type->groups); | |
404 | ||
405 | if (class) | |
406 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
407 | } |
408 | ||
409 | ||
23681e47 GKH |
410 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
411 | char *buf) | |
412 | { | |
413 | return print_dev_t(buf, dev->devt); | |
414 | } | |
415 | ||
0863afb3 MW |
416 | /* |
417 | * devices_subsys - structure to be registered with kobject core. | |
1da177e4 LT |
418 | */ |
419 | ||
312c004d | 420 | decl_subsys(devices, &ktype_device, &device_uevent_ops); |
1da177e4 LT |
421 | |
422 | ||
423 | /** | |
424 | * device_create_file - create sysfs attribute file for device. | |
425 | * @dev: device. | |
426 | * @attr: device attribute descriptor. | |
427 | */ | |
428 | ||
429 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
430 | { | |
431 | int error = 0; | |
432 | if (get_device(dev)) { | |
433 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
434 | put_device(dev); | |
435 | } | |
436 | return error; | |
437 | } | |
438 | ||
439 | /** | |
440 | * device_remove_file - remove sysfs attribute file. | |
441 | * @dev: device. | |
442 | * @attr: device attribute descriptor. | |
443 | */ | |
444 | ||
445 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
446 | { | |
447 | if (get_device(dev)) { | |
448 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
449 | put_device(dev); | |
450 | } | |
451 | } | |
452 | ||
2589f188 GKH |
453 | /** |
454 | * device_create_bin_file - create sysfs binary attribute file for device. | |
455 | * @dev: device. | |
456 | * @attr: device binary attribute descriptor. | |
457 | */ | |
458 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
459 | { | |
460 | int error = -EINVAL; | |
461 | if (dev) | |
462 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
463 | return error; | |
464 | } | |
465 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
466 | ||
467 | /** | |
468 | * device_remove_bin_file - remove sysfs binary attribute file | |
469 | * @dev: device. | |
470 | * @attr: device binary attribute descriptor. | |
471 | */ | |
472 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
473 | { | |
474 | if (dev) | |
475 | sysfs_remove_bin_file(&dev->kobj, attr); | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
478 | ||
d9a9cdfb AS |
479 | /** |
480 | * device_schedule_callback - helper to schedule a callback for a device | |
481 | * @dev: device. | |
482 | * @func: callback function to invoke later. | |
483 | * | |
484 | * Attribute methods must not unregister themselves or their parent device | |
485 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
486 | * since unregistration is mutually exclusive with driver callbacks. | |
487 | * | |
488 | * Instead methods can call this routine, which will attempt to allocate | |
489 | * and schedule a workqueue request to call back @func with @dev as its | |
490 | * argument in the workqueue's process context. @dev will be pinned until | |
491 | * @func returns. | |
492 | * | |
493 | * Returns 0 if the request was submitted, -ENOMEM if storage could not | |
494 | * be allocated. | |
495 | * | |
496 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
497 | * underlying sysfs routine (since it is intended for use by attribute | |
498 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
499 | */ | |
500 | int device_schedule_callback(struct device *dev, | |
501 | void (*func)(struct device *)) | |
502 | { | |
503 | return sysfs_schedule_callback(&dev->kobj, | |
504 | (void (*)(void *)) func, dev); | |
505 | } | |
506 | EXPORT_SYMBOL_GPL(device_schedule_callback); | |
507 | ||
34bb61f9 JB |
508 | static void klist_children_get(struct klist_node *n) |
509 | { | |
510 | struct device *dev = container_of(n, struct device, knode_parent); | |
511 | ||
512 | get_device(dev); | |
513 | } | |
514 | ||
515 | static void klist_children_put(struct klist_node *n) | |
516 | { | |
517 | struct device *dev = container_of(n, struct device, knode_parent); | |
518 | ||
519 | put_device(dev); | |
520 | } | |
521 | ||
1da177e4 LT |
522 | |
523 | /** | |
524 | * device_initialize - init device structure. | |
525 | * @dev: device. | |
526 | * | |
527 | * This prepares the device for use by other layers, | |
528 | * including adding it to the device hierarchy. | |
529 | * It is the first half of device_register(), if called by | |
530 | * that, though it can also be called separately, so one | |
531 | * may use @dev's fields (e.g. the refcount). | |
532 | */ | |
533 | ||
534 | void device_initialize(struct device *dev) | |
535 | { | |
536 | kobj_set_kset_s(dev, devices_subsys); | |
537 | kobject_init(&dev->kobj); | |
34bb61f9 JB |
538 | klist_init(&dev->klist_children, klist_children_get, |
539 | klist_children_put); | |
1da177e4 | 540 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 541 | INIT_LIST_HEAD(&dev->node); |
af70316a | 542 | init_MUTEX(&dev->sem); |
9ac7849e TH |
543 | spin_lock_init(&dev->devres_lock); |
544 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 545 | device_init_wakeup(dev, 0); |
87348136 | 546 | set_dev_node(dev, -1); |
1da177e4 LT |
547 | } |
548 | ||
40fa5422 | 549 | #ifdef CONFIG_SYSFS_DEPRECATED |
c744aeae CH |
550 | static struct kobject * get_device_parent(struct device *dev, |
551 | struct device *parent) | |
40fa5422 GKH |
552 | { |
553 | /* Set the parent to the class, not the parent device */ | |
554 | /* this keeps sysfs from having a symlink to make old udevs happy */ | |
555 | if (dev->class) | |
c744aeae | 556 | return &dev->class->subsys.kset.kobj; |
40fa5422 | 557 | else if (parent) |
c744aeae | 558 | return &parent->kobj; |
40fa5422 | 559 | |
c744aeae | 560 | return NULL; |
40fa5422 GKH |
561 | } |
562 | #else | |
86406245 | 563 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 564 | { |
86406245 | 565 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 566 | |
86406245 KS |
567 | if (!virtual_dir) |
568 | virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual"); | |
f0ee61a6 | 569 | |
86406245 | 570 | return virtual_dir; |
f0ee61a6 GKH |
571 | } |
572 | ||
c744aeae CH |
573 | static struct kobject * get_device_parent(struct device *dev, |
574 | struct device *parent) | |
40fa5422 | 575 | { |
86406245 KS |
576 | if (dev->class) { |
577 | struct kobject *kobj = NULL; | |
578 | struct kobject *parent_kobj; | |
579 | struct kobject *k; | |
580 | ||
581 | /* | |
582 | * If we have no parent, we live in "virtual". | |
583 | * Class-devices with a bus-device as parent, live | |
584 | * in a class-directory to prevent namespace collisions. | |
585 | */ | |
586 | if (parent == NULL) | |
587 | parent_kobj = virtual_device_parent(dev); | |
588 | else if (parent->class) | |
589 | return &parent->kobj; | |
590 | else | |
591 | parent_kobj = &parent->kobj; | |
592 | ||
593 | /* find our class-directory at the parent and reference it */ | |
594 | spin_lock(&dev->class->class_dirs.list_lock); | |
595 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
596 | if (k->parent == parent_kobj) { | |
597 | kobj = kobject_get(k); | |
598 | break; | |
599 | } | |
600 | spin_unlock(&dev->class->class_dirs.list_lock); | |
601 | if (kobj) | |
602 | return kobj; | |
603 | ||
604 | /* or create a new class-directory at the parent device */ | |
605 | return kobject_kset_add_dir(&dev->class->class_dirs, | |
606 | parent_kobj, dev->class->name); | |
607 | } | |
608 | ||
609 | if (parent) | |
c744aeae CH |
610 | return &parent->kobj; |
611 | return NULL; | |
612 | } | |
c744aeae | 613 | #endif |
86406245 | 614 | |
c744aeae CH |
615 | static int setup_parent(struct device *dev, struct device *parent) |
616 | { | |
617 | struct kobject *kobj; | |
618 | kobj = get_device_parent(dev, parent); | |
619 | if (IS_ERR(kobj)) | |
620 | return PTR_ERR(kobj); | |
621 | if (kobj) | |
622 | dev->kobj.parent = kobj; | |
40fa5422 GKH |
623 | return 0; |
624 | } | |
40fa5422 | 625 | |
1da177e4 LT |
626 | /** |
627 | * device_add - add device to device hierarchy. | |
628 | * @dev: device. | |
629 | * | |
630 | * This is part 2 of device_register(), though may be called | |
631 | * separately _iff_ device_initialize() has been called separately. | |
632 | * | |
633 | * This adds it to the kobject hierarchy via kobject_add(), adds it | |
634 | * to the global and sibling lists for the device, then | |
635 | * adds it to the other relevant subsystems of the driver model. | |
636 | */ | |
637 | int device_add(struct device *dev) | |
638 | { | |
639 | struct device *parent = NULL; | |
e9a7d305 | 640 | char *class_name = NULL; |
c47ed219 | 641 | struct class_interface *class_intf; |
1da177e4 LT |
642 | int error = -EINVAL; |
643 | ||
644 | dev = get_device(dev); | |
645 | if (!dev || !strlen(dev->bus_id)) | |
646 | goto Error; | |
647 | ||
40fa5422 | 648 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); |
c205ef48 | 649 | |
1da177e4 | 650 | parent = get_device(dev->parent); |
40fa5422 GKH |
651 | error = setup_parent(dev, parent); |
652 | if (error) | |
653 | goto Error; | |
1da177e4 LT |
654 | |
655 | /* first, register with generic layer. */ | |
656 | kobject_set_name(&dev->kobj, "%s", dev->bus_id); | |
40fa5422 GKH |
657 | error = kobject_add(&dev->kobj); |
658 | if (error) | |
1da177e4 | 659 | goto Error; |
a7fd6706 | 660 | |
37022644 BW |
661 | /* notify platform of device entry */ |
662 | if (platform_notify) | |
663 | platform_notify(dev); | |
664 | ||
116af378 BH |
665 | /* notify clients of device entry (new way) */ |
666 | if (dev->bus) | |
667 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
668 | BUS_NOTIFY_ADD_DEVICE, dev); | |
669 | ||
a7fd6706 | 670 | dev->uevent_attr.attr.name = "uevent"; |
16574dcc | 671 | dev->uevent_attr.attr.mode = S_IRUGO | S_IWUSR; |
a7fd6706 KS |
672 | if (dev->driver) |
673 | dev->uevent_attr.attr.owner = dev->driver->owner; | |
674 | dev->uevent_attr.store = store_uevent; | |
16574dcc | 675 | dev->uevent_attr.show = show_uevent; |
a306eea4 CH |
676 | error = device_create_file(dev, &dev->uevent_attr); |
677 | if (error) | |
678 | goto attrError; | |
a7fd6706 | 679 | |
23681e47 GKH |
680 | if (MAJOR(dev->devt)) { |
681 | struct device_attribute *attr; | |
682 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
683 | if (!attr) { | |
684 | error = -ENOMEM; | |
a306eea4 | 685 | goto ueventattrError; |
23681e47 GKH |
686 | } |
687 | attr->attr.name = "dev"; | |
688 | attr->attr.mode = S_IRUGO; | |
689 | if (dev->driver) | |
690 | attr->attr.owner = dev->driver->owner; | |
691 | attr->show = show_dev; | |
692 | error = device_create_file(dev, attr); | |
693 | if (error) { | |
694 | kfree(attr); | |
a306eea4 | 695 | goto ueventattrError; |
23681e47 GKH |
696 | } |
697 | ||
698 | dev->devt_attr = attr; | |
699 | } | |
700 | ||
b9d9c82b KS |
701 | if (dev->class) { |
702 | sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj, | |
703 | "subsystem"); | |
40fa5422 GKH |
704 | /* If this is not a "fake" compatible device, then create the |
705 | * symlink from the class to the device. */ | |
706 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
707 | sysfs_create_link(&dev->class->subsys.kset.kobj, | |
708 | &dev->kobj, dev->bus_id); | |
64bb5d2c | 709 | if (parent) { |
cb360bbf CH |
710 | sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
711 | "device"); | |
f7f3461d | 712 | #ifdef CONFIG_SYSFS_DEPRECATED |
cb360bbf CH |
713 | class_name = make_class_name(dev->class->name, |
714 | &dev->kobj); | |
715 | if (class_name) | |
716 | sysfs_create_link(&dev->parent->kobj, | |
717 | &dev->kobj, class_name); | |
99ef3ef8 | 718 | #endif |
f7f3461d | 719 | } |
b9d9c82b | 720 | } |
23681e47 | 721 | |
2620efef GKH |
722 | if ((error = device_add_attrs(dev))) |
723 | goto AttrsError; | |
1da177e4 LT |
724 | if ((error = device_pm_add(dev))) |
725 | goto PMError; | |
726 | if ((error = bus_add_device(dev))) | |
727 | goto BusError; | |
83b5fb4c | 728 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 729 | bus_attach_device(dev); |
1da177e4 | 730 | if (parent) |
d856f1e3 | 731 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 732 | |
5d9fd169 | 733 | if (dev->class) { |
5d9fd169 | 734 | down(&dev->class->sem); |
c47ed219 | 735 | /* tie the class to the device */ |
5d9fd169 | 736 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
737 | |
738 | /* notify any interfaces that the device is here */ | |
739 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
740 | if (class_intf->add_dev) | |
741 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
742 | up(&dev->class->sem); |
743 | } | |
1da177e4 | 744 | Done: |
621a1672 | 745 | kfree(class_name); |
1da177e4 LT |
746 | put_device(dev); |
747 | return error; | |
748 | BusError: | |
749 | device_pm_remove(dev); | |
750 | PMError: | |
116af378 BH |
751 | if (dev->bus) |
752 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
753 | BUS_NOTIFY_DEL_DEVICE, dev); | |
82f0cf9b | 754 | device_remove_attrs(dev); |
2620efef | 755 | AttrsError: |
23681e47 GKH |
756 | if (dev->devt_attr) { |
757 | device_remove_file(dev, dev->devt_attr); | |
758 | kfree(dev->devt_attr); | |
759 | } | |
82f0cf9b JS |
760 | |
761 | if (dev->class) { | |
762 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
763 | /* If this is not a "fake" compatible device, remove the | |
764 | * symlink from the class to the device. */ | |
765 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
766 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
767 | dev->bus_id); | |
82f0cf9b | 768 | if (parent) { |
f7f3461d | 769 | #ifdef CONFIG_SYSFS_DEPRECATED |
82f0cf9b JS |
770 | char *class_name = make_class_name(dev->class->name, |
771 | &dev->kobj); | |
772 | if (class_name) | |
773 | sysfs_remove_link(&dev->parent->kobj, | |
774 | class_name); | |
775 | kfree(class_name); | |
f7f3461d | 776 | #endif |
82f0cf9b JS |
777 | sysfs_remove_link(&dev->kobj, "device"); |
778 | } | |
82f0cf9b | 779 | } |
a306eea4 CH |
780 | ueventattrError: |
781 | device_remove_file(dev, &dev->uevent_attr); | |
23681e47 | 782 | attrError: |
312c004d | 783 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
784 | kobject_del(&dev->kobj); |
785 | Error: | |
786 | if (parent) | |
787 | put_device(parent); | |
788 | goto Done; | |
789 | } | |
790 | ||
791 | ||
792 | /** | |
793 | * device_register - register a device with the system. | |
794 | * @dev: pointer to the device structure | |
795 | * | |
796 | * This happens in two clean steps - initialize the device | |
797 | * and add it to the system. The two steps can be called | |
798 | * separately, but this is the easiest and most common. | |
799 | * I.e. you should only call the two helpers separately if | |
800 | * have a clearly defined need to use and refcount the device | |
801 | * before it is added to the hierarchy. | |
802 | */ | |
803 | ||
804 | int device_register(struct device *dev) | |
805 | { | |
806 | device_initialize(dev); | |
807 | return device_add(dev); | |
808 | } | |
809 | ||
810 | ||
811 | /** | |
812 | * get_device - increment reference count for device. | |
813 | * @dev: device. | |
814 | * | |
815 | * This simply forwards the call to kobject_get(), though | |
816 | * we do take care to provide for the case that we get a NULL | |
817 | * pointer passed in. | |
818 | */ | |
819 | ||
820 | struct device * get_device(struct device * dev) | |
821 | { | |
822 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
823 | } | |
824 | ||
825 | ||
826 | /** | |
827 | * put_device - decrement reference count. | |
828 | * @dev: device in question. | |
829 | */ | |
830 | void put_device(struct device * dev) | |
831 | { | |
832 | if (dev) | |
833 | kobject_put(&dev->kobj); | |
834 | } | |
835 | ||
836 | ||
837 | /** | |
838 | * device_del - delete device from system. | |
839 | * @dev: device. | |
840 | * | |
841 | * This is the first part of the device unregistration | |
842 | * sequence. This removes the device from the lists we control | |
843 | * from here, has it removed from the other driver model | |
844 | * subsystems it was added to in device_add(), and removes it | |
845 | * from the kobject hierarchy. | |
846 | * | |
847 | * NOTE: this should be called manually _iff_ device_add() was | |
848 | * also called manually. | |
849 | */ | |
850 | ||
851 | void device_del(struct device * dev) | |
852 | { | |
853 | struct device * parent = dev->parent; | |
c47ed219 | 854 | struct class_interface *class_intf; |
1da177e4 | 855 | |
1da177e4 | 856 | if (parent) |
d62c0f9f | 857 | klist_del(&dev->knode_parent); |
82189b98 | 858 | if (dev->devt_attr) { |
23681e47 | 859 | device_remove_file(dev, dev->devt_attr); |
82189b98 CM |
860 | kfree(dev->devt_attr); |
861 | } | |
b9d9c82b KS |
862 | if (dev->class) { |
863 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
40fa5422 GKH |
864 | /* If this is not a "fake" compatible device, remove the |
865 | * symlink from the class to the device. */ | |
866 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
867 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
868 | dev->bus_id); | |
64bb5d2c | 869 | if (parent) { |
f7f3461d | 870 | #ifdef CONFIG_SYSFS_DEPRECATED |
99ef3ef8 KS |
871 | char *class_name = make_class_name(dev->class->name, |
872 | &dev->kobj); | |
cb360bbf CH |
873 | if (class_name) |
874 | sysfs_remove_link(&dev->parent->kobj, | |
875 | class_name); | |
99ef3ef8 | 876 | kfree(class_name); |
f7f3461d | 877 | #endif |
99ef3ef8 | 878 | sysfs_remove_link(&dev->kobj, "device"); |
64bb5d2c | 879 | } |
99ef3ef8 | 880 | |
5d9fd169 | 881 | down(&dev->class->sem); |
c47ed219 GKH |
882 | /* notify any interfaces that the device is now gone */ |
883 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
884 | if (class_intf->remove_dev) | |
885 | class_intf->remove_dev(dev, class_intf); | |
886 | /* remove the device from the class list */ | |
5d9fd169 GKH |
887 | list_del_init(&dev->node); |
888 | up(&dev->class->sem); | |
86406245 KS |
889 | |
890 | /* If we live in a parent class-directory, unreference it */ | |
891 | if (dev->kobj.parent->kset == &dev->class->class_dirs) { | |
892 | struct device *d; | |
893 | int other = 0; | |
894 | ||
895 | /* | |
896 | * if we are the last child of our class, delete | |
897 | * our class-directory at this parent | |
898 | */ | |
899 | down(&dev->class->sem); | |
900 | list_for_each_entry(d, &dev->class->devices, node) { | |
901 | if (d == dev) | |
902 | continue; | |
903 | if (d->kobj.parent == dev->kobj.parent) { | |
904 | other = 1; | |
905 | break; | |
906 | } | |
907 | } | |
908 | if (!other) | |
909 | kobject_del(dev->kobj.parent); | |
910 | ||
911 | kobject_put(dev->kobj.parent); | |
912 | up(&dev->class->sem); | |
913 | } | |
b9d9c82b | 914 | } |
a7fd6706 | 915 | device_remove_file(dev, &dev->uevent_attr); |
2620efef | 916 | device_remove_attrs(dev); |
28953533 | 917 | bus_remove_device(dev); |
1da177e4 | 918 | |
2f8d16a9 TH |
919 | /* |
920 | * Some platform devices are driven without driver attached | |
921 | * and managed resources may have been acquired. Make sure | |
922 | * all resources are released. | |
923 | */ | |
924 | devres_release_all(dev); | |
925 | ||
1da177e4 LT |
926 | /* Notify the platform of the removal, in case they |
927 | * need to do anything... | |
928 | */ | |
929 | if (platform_notify_remove) | |
930 | platform_notify_remove(dev); | |
116af378 BH |
931 | if (dev->bus) |
932 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
933 | BUS_NOTIFY_DEL_DEVICE, dev); | |
1da177e4 | 934 | device_pm_remove(dev); |
312c004d | 935 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
936 | kobject_del(&dev->kobj); |
937 | if (parent) | |
938 | put_device(parent); | |
939 | } | |
940 | ||
941 | /** | |
942 | * device_unregister - unregister device from system. | |
943 | * @dev: device going away. | |
944 | * | |
945 | * We do this in two parts, like we do device_register(). First, | |
946 | * we remove it from all the subsystems with device_del(), then | |
947 | * we decrement the reference count via put_device(). If that | |
948 | * is the final reference count, the device will be cleaned up | |
949 | * via device_release() above. Otherwise, the structure will | |
950 | * stick around until the final reference to the device is dropped. | |
951 | */ | |
952 | void device_unregister(struct device * dev) | |
953 | { | |
954 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); | |
955 | device_del(dev); | |
956 | put_device(dev); | |
957 | } | |
958 | ||
959 | ||
36239577 | 960 | static struct device * next_device(struct klist_iter * i) |
961 | { | |
962 | struct klist_node * n = klist_next(i); | |
963 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
964 | } | |
965 | ||
1da177e4 LT |
966 | /** |
967 | * device_for_each_child - device child iterator. | |
c41455fb | 968 | * @parent: parent struct device. |
1da177e4 LT |
969 | * @data: data for the callback. |
970 | * @fn: function to be called for each device. | |
971 | * | |
c41455fb | 972 | * Iterate over @parent's child devices, and call @fn for each, |
1da177e4 LT |
973 | * passing it @data. |
974 | * | |
975 | * We check the return of @fn each time. If it returns anything | |
976 | * other than 0, we break out and return that value. | |
977 | */ | |
36239577 | 978 | int device_for_each_child(struct device * parent, void * data, |
1da177e4 LT |
979 | int (*fn)(struct device *, void *)) |
980 | { | |
36239577 | 981 | struct klist_iter i; |
1da177e4 LT |
982 | struct device * child; |
983 | int error = 0; | |
984 | ||
36239577 | 985 | klist_iter_init(&parent->klist_children, &i); |
986 | while ((child = next_device(&i)) && !error) | |
987 | error = fn(child, data); | |
988 | klist_iter_exit(&i); | |
1da177e4 LT |
989 | return error; |
990 | } | |
991 | ||
5ab69981 CH |
992 | /** |
993 | * device_find_child - device iterator for locating a particular device. | |
994 | * @parent: parent struct device | |
995 | * @data: Data to pass to match function | |
996 | * @match: Callback function to check device | |
997 | * | |
998 | * This is similar to the device_for_each_child() function above, but it | |
999 | * returns a reference to a device that is 'found' for later use, as | |
1000 | * determined by the @match callback. | |
1001 | * | |
1002 | * The callback should return 0 if the device doesn't match and non-zero | |
1003 | * if it does. If the callback returns non-zero and a reference to the | |
1004 | * current device can be obtained, this function will return to the caller | |
1005 | * and not iterate over any more devices. | |
1006 | */ | |
1007 | struct device * device_find_child(struct device *parent, void *data, | |
1008 | int (*match)(struct device *, void *)) | |
1009 | { | |
1010 | struct klist_iter i; | |
1011 | struct device *child; | |
1012 | ||
1013 | if (!parent) | |
1014 | return NULL; | |
1015 | ||
1016 | klist_iter_init(&parent->klist_children, &i); | |
1017 | while ((child = next_device(&i))) | |
1018 | if (match(child, data) && get_device(child)) | |
1019 | break; | |
1020 | klist_iter_exit(&i); | |
1021 | return child; | |
1022 | } | |
1023 | ||
1da177e4 LT |
1024 | int __init devices_init(void) |
1025 | { | |
1026 | return subsystem_register(&devices_subsys); | |
1027 | } | |
1028 | ||
1029 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1030 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1031 | |
1032 | EXPORT_SYMBOL_GPL(device_initialize); | |
1033 | EXPORT_SYMBOL_GPL(device_add); | |
1034 | EXPORT_SYMBOL_GPL(device_register); | |
1035 | ||
1036 | EXPORT_SYMBOL_GPL(device_del); | |
1037 | EXPORT_SYMBOL_GPL(device_unregister); | |
1038 | EXPORT_SYMBOL_GPL(get_device); | |
1039 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1040 | |
1041 | EXPORT_SYMBOL_GPL(device_create_file); | |
1042 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1043 | |
1044 | ||
1045 | static void device_create_release(struct device *dev) | |
1046 | { | |
1047 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); | |
1048 | kfree(dev); | |
1049 | } | |
1050 | ||
1051 | /** | |
1052 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1053 | * @class: pointer to the struct class that this device should be registered to |
1054 | * @parent: pointer to the parent struct device of this new device, if any | |
1055 | * @devt: the dev_t for the char device to be added | |
1056 | * @fmt: string for the device's name | |
1057 | * | |
1058 | * This function can be used by char device classes. A struct device | |
1059 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1060 | * |
23681e47 GKH |
1061 | * A "dev" file will be created, showing the dev_t for the device, if |
1062 | * the dev_t is not 0,0. | |
42734daf HK |
1063 | * If a pointer to a parent struct device is passed in, the newly created |
1064 | * struct device will be a child of that device in sysfs. | |
1065 | * The pointer to the struct device will be returned from the call. | |
1066 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1067 | * pointer. |
1068 | * | |
1069 | * Note: the struct class passed to this function must have previously | |
1070 | * been created with a call to class_create(). | |
1071 | */ | |
1072 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1073 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1074 | { |
1075 | va_list args; | |
1076 | struct device *dev = NULL; | |
1077 | int retval = -ENODEV; | |
1078 | ||
1079 | if (class == NULL || IS_ERR(class)) | |
1080 | goto error; | |
23681e47 GKH |
1081 | |
1082 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1083 | if (!dev) { | |
1084 | retval = -ENOMEM; | |
1085 | goto error; | |
1086 | } | |
1087 | ||
1088 | dev->devt = devt; | |
1089 | dev->class = class; | |
1090 | dev->parent = parent; | |
1091 | dev->release = device_create_release; | |
1092 | ||
1093 | va_start(args, fmt); | |
1094 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1095 | va_end(args); | |
1096 | retval = device_register(dev); | |
1097 | if (retval) | |
1098 | goto error; | |
1099 | ||
23681e47 GKH |
1100 | return dev; |
1101 | ||
1102 | error: | |
1103 | kfree(dev); | |
1104 | return ERR_PTR(retval); | |
1105 | } | |
1106 | EXPORT_SYMBOL_GPL(device_create); | |
1107 | ||
1108 | /** | |
1109 | * device_destroy - removes a device that was created with device_create() | |
42734daf HK |
1110 | * @class: pointer to the struct class that this device was registered with |
1111 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 1112 | * |
42734daf HK |
1113 | * This call unregisters and cleans up a device that was created with a |
1114 | * call to device_create(). | |
23681e47 GKH |
1115 | */ |
1116 | void device_destroy(struct class *class, dev_t devt) | |
1117 | { | |
1118 | struct device *dev = NULL; | |
1119 | struct device *dev_tmp; | |
1120 | ||
1121 | down(&class->sem); | |
1122 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1123 | if (dev_tmp->devt == devt) { | |
1124 | dev = dev_tmp; | |
1125 | break; | |
1126 | } | |
1127 | } | |
1128 | up(&class->sem); | |
1129 | ||
5d9fd169 | 1130 | if (dev) |
23681e47 | 1131 | device_unregister(dev); |
23681e47 GKH |
1132 | } |
1133 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1134 | |
1135 | /** | |
1136 | * device_rename - renames a device | |
1137 | * @dev: the pointer to the struct device to be renamed | |
1138 | * @new_name: the new name of the device | |
1139 | */ | |
1140 | int device_rename(struct device *dev, char *new_name) | |
1141 | { | |
1142 | char *old_class_name = NULL; | |
1143 | char *new_class_name = NULL; | |
1144 | char *old_symlink_name = NULL; | |
1145 | int error; | |
1146 | ||
1147 | dev = get_device(dev); | |
1148 | if (!dev) | |
1149 | return -EINVAL; | |
1150 | ||
1151 | pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); | |
1152 | ||
99ef3ef8 | 1153 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1154 | if ((dev->class) && (dev->parent)) |
1155 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1156 | #endif |
a2de48ca GKH |
1157 | |
1158 | if (dev->class) { | |
1159 | old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); | |
952ab431 JJ |
1160 | if (!old_symlink_name) { |
1161 | error = -ENOMEM; | |
1162 | goto out_free_old_class; | |
1163 | } | |
a2de48ca GKH |
1164 | strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE); |
1165 | } | |
1166 | ||
1167 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); | |
1168 | ||
1169 | error = kobject_rename(&dev->kobj, new_name); | |
1170 | ||
99ef3ef8 | 1171 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1172 | if (old_class_name) { |
1173 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1174 | if (new_class_name) { | |
1175 | sysfs_create_link(&dev->parent->kobj, &dev->kobj, | |
1176 | new_class_name); | |
1177 | sysfs_remove_link(&dev->parent->kobj, old_class_name); | |
1178 | } | |
1179 | } | |
99ef3ef8 KS |
1180 | #endif |
1181 | ||
a2de48ca GKH |
1182 | if (dev->class) { |
1183 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
1184 | old_symlink_name); | |
1185 | sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj, | |
1186 | dev->bus_id); | |
1187 | } | |
1188 | put_device(dev); | |
1189 | ||
a2de48ca GKH |
1190 | kfree(new_class_name); |
1191 | kfree(old_symlink_name); | |
952ab431 JJ |
1192 | out_free_old_class: |
1193 | kfree(old_class_name); | |
a2de48ca GKH |
1194 | |
1195 | return error; | |
1196 | } | |
a2807dbc | 1197 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1198 | |
1199 | static int device_move_class_links(struct device *dev, | |
1200 | struct device *old_parent, | |
1201 | struct device *new_parent) | |
1202 | { | |
f7f3461d | 1203 | int error = 0; |
8a82472f | 1204 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1205 | char *class_name; |
1206 | ||
1207 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1208 | if (!class_name) { | |
cb360bbf | 1209 | error = -ENOMEM; |
8a82472f CH |
1210 | goto out; |
1211 | } | |
1212 | if (old_parent) { | |
1213 | sysfs_remove_link(&dev->kobj, "device"); | |
1214 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1215 | } | |
c744aeae CH |
1216 | if (new_parent) { |
1217 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1218 | "device"); | |
1219 | if (error) | |
1220 | goto out; | |
1221 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1222 | class_name); | |
1223 | if (error) | |
1224 | sysfs_remove_link(&dev->kobj, "device"); | |
1225 | } | |
1226 | else | |
1227 | error = 0; | |
8a82472f CH |
1228 | out: |
1229 | kfree(class_name); | |
1230 | return error; | |
1231 | #else | |
f7f3461d GKH |
1232 | if (old_parent) |
1233 | sysfs_remove_link(&dev->kobj, "device"); | |
1234 | if (new_parent) | |
1235 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1236 | "device"); | |
1237 | return error; | |
8a82472f CH |
1238 | #endif |
1239 | } | |
1240 | ||
1241 | /** | |
1242 | * device_move - moves a device to a new parent | |
1243 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1244 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1245 | */ |
1246 | int device_move(struct device *dev, struct device *new_parent) | |
1247 | { | |
1248 | int error; | |
1249 | struct device *old_parent; | |
c744aeae | 1250 | struct kobject *new_parent_kobj; |
8a82472f CH |
1251 | |
1252 | dev = get_device(dev); | |
1253 | if (!dev) | |
1254 | return -EINVAL; | |
1255 | ||
8a82472f | 1256 | new_parent = get_device(new_parent); |
c744aeae CH |
1257 | new_parent_kobj = get_device_parent (dev, new_parent); |
1258 | if (IS_ERR(new_parent_kobj)) { | |
1259 | error = PTR_ERR(new_parent_kobj); | |
1260 | put_device(new_parent); | |
8a82472f CH |
1261 | goto out; |
1262 | } | |
1263 | pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, | |
c744aeae CH |
1264 | new_parent ? new_parent->bus_id : "<NULL>"); |
1265 | error = kobject_move(&dev->kobj, new_parent_kobj); | |
8a82472f CH |
1266 | if (error) { |
1267 | put_device(new_parent); | |
1268 | goto out; | |
1269 | } | |
1270 | old_parent = dev->parent; | |
1271 | dev->parent = new_parent; | |
1272 | if (old_parent) | |
acf02d23 | 1273 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1274 | if (new_parent) |
1275 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1276 | if (!dev->class) |
1277 | goto out_put; | |
1278 | error = device_move_class_links(dev, old_parent, new_parent); | |
1279 | if (error) { | |
1280 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1281 | device_move_class_links(dev, new_parent, old_parent); | |
1282 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1283 | if (new_parent) |
1284 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1285 | if (old_parent) |
1286 | klist_add_tail(&dev->knode_parent, | |
1287 | &old_parent->klist_children); | |
1288 | } | |
1289 | put_device(new_parent); | |
1290 | goto out; | |
1291 | } | |
1292 | out_put: | |
1293 | put_device(old_parent); | |
1294 | out: | |
1295 | put_device(dev); | |
1296 | return error; | |
1297 | } | |
1298 | ||
1299 | EXPORT_SYMBOL_GPL(device_move); |