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Commit | Line | Data |
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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 : | |
46 | (dev->bus ? dev->bus->name : ""); | |
47 | } | |
310a922d | 48 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 49 | |
1da177e4 LT |
50 | #define to_dev(obj) container_of(obj, struct device, kobj) |
51 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
52 | ||
1da177e4 LT |
53 | static ssize_t |
54 | dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
55 | { | |
56 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
57 | struct device * dev = to_dev(kobj); | |
4a0c20bf | 58 | ssize_t ret = -EIO; |
1da177e4 LT |
59 | |
60 | if (dev_attr->show) | |
54b6f35c | 61 | ret = dev_attr->show(dev, dev_attr, buf); |
1da177e4 LT |
62 | return ret; |
63 | } | |
64 | ||
65 | static ssize_t | |
66 | dev_attr_store(struct kobject * kobj, struct attribute * attr, | |
67 | const char * buf, size_t count) | |
68 | { | |
69 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
70 | struct device * dev = to_dev(kobj); | |
4a0c20bf | 71 | ssize_t ret = -EIO; |
1da177e4 LT |
72 | |
73 | if (dev_attr->store) | |
54b6f35c | 74 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
75 | return ret; |
76 | } | |
77 | ||
78 | static struct sysfs_ops dev_sysfs_ops = { | |
79 | .show = dev_attr_show, | |
80 | .store = dev_attr_store, | |
81 | }; | |
82 | ||
83 | ||
84 | /** | |
85 | * device_release - free device structure. | |
86 | * @kobj: device's kobject. | |
87 | * | |
88 | * This is called once the reference count for the object | |
89 | * reaches 0. We forward the call to the device's release | |
90 | * method, which should handle actually freeing the structure. | |
91 | */ | |
92 | static void device_release(struct kobject * kobj) | |
93 | { | |
94 | struct device * dev = to_dev(kobj); | |
95 | ||
96 | if (dev->release) | |
97 | dev->release(dev); | |
f9f852df KS |
98 | else if (dev->type && dev->type->release) |
99 | dev->type->release(dev); | |
2620efef GKH |
100 | else if (dev->class && dev->class->dev_release) |
101 | dev->class->dev_release(dev); | |
1da177e4 LT |
102 | else { |
103 | printk(KERN_ERR "Device '%s' does not have a release() function, " | |
104 | "it is broken and must be fixed.\n", | |
105 | dev->bus_id); | |
106 | WARN_ON(1); | |
107 | } | |
108 | } | |
109 | ||
110 | static struct kobj_type ktype_device = { | |
111 | .release = device_release, | |
112 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
113 | }; |
114 | ||
115 | ||
312c004d | 116 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
117 | { |
118 | struct kobj_type *ktype = get_ktype(kobj); | |
119 | ||
120 | if (ktype == &ktype_device) { | |
121 | struct device *dev = to_dev(kobj); | |
122 | if (dev->bus) | |
123 | return 1; | |
23681e47 GKH |
124 | if (dev->class) |
125 | return 1; | |
1da177e4 LT |
126 | } |
127 | return 0; | |
128 | } | |
129 | ||
312c004d | 130 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
131 | { |
132 | struct device *dev = to_dev(kobj); | |
133 | ||
23681e47 GKH |
134 | if (dev->bus) |
135 | return dev->bus->name; | |
136 | if (dev->class) | |
137 | return dev->class->name; | |
138 | return NULL; | |
1da177e4 LT |
139 | } |
140 | ||
312c004d | 141 | static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp, |
1da177e4 LT |
142 | int num_envp, char *buffer, int buffer_size) |
143 | { | |
144 | struct device *dev = to_dev(kobj); | |
145 | int i = 0; | |
146 | int length = 0; | |
147 | int retval = 0; | |
148 | ||
23681e47 GKH |
149 | /* add the major/minor if present */ |
150 | if (MAJOR(dev->devt)) { | |
151 | add_uevent_var(envp, num_envp, &i, | |
152 | buffer, buffer_size, &length, | |
153 | "MAJOR=%u", MAJOR(dev->devt)); | |
154 | add_uevent_var(envp, num_envp, &i, | |
155 | buffer, buffer_size, &length, | |
156 | "MINOR=%u", MINOR(dev->devt)); | |
157 | } | |
158 | ||
239378f1 | 159 | if (dev->driver) |
d81d9d6b KS |
160 | add_uevent_var(envp, num_envp, &i, |
161 | buffer, buffer_size, &length, | |
162 | "DRIVER=%s", dev->driver->name); | |
239378f1 | 163 | |
a87cb2ac | 164 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
165 | if (dev->class) { |
166 | struct device *parent = dev->parent; | |
167 | ||
168 | /* find first bus device in parent chain */ | |
169 | while (parent && !parent->bus) | |
170 | parent = parent->parent; | |
171 | if (parent && parent->bus) { | |
172 | const char *path; | |
173 | ||
174 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
175 | add_uevent_var(envp, num_envp, &i, | |
176 | buffer, buffer_size, &length, | |
177 | "PHYSDEVPATH=%s", path); | |
178 | kfree(path); | |
179 | ||
180 | add_uevent_var(envp, num_envp, &i, | |
181 | buffer, buffer_size, &length, | |
182 | "PHYSDEVBUS=%s", parent->bus->name); | |
183 | ||
184 | if (parent->driver) | |
185 | add_uevent_var(envp, num_envp, &i, | |
186 | buffer, buffer_size, &length, | |
187 | "PHYSDEVDRIVER=%s", parent->driver->name); | |
188 | } | |
189 | } else if (dev->bus) { | |
312c004d KS |
190 | add_uevent_var(envp, num_envp, &i, |
191 | buffer, buffer_size, &length, | |
239378f1 KS |
192 | "PHYSDEVBUS=%s", dev->bus->name); |
193 | ||
194 | if (dev->driver) | |
195 | add_uevent_var(envp, num_envp, &i, | |
196 | buffer, buffer_size, &length, | |
197 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
d81d9d6b | 198 | } |
239378f1 | 199 | #endif |
1da177e4 LT |
200 | |
201 | /* terminate, set to next free slot, shrink available space */ | |
202 | envp[i] = NULL; | |
203 | envp = &envp[i]; | |
204 | num_envp -= i; | |
205 | buffer = &buffer[length]; | |
206 | buffer_size -= length; | |
207 | ||
312c004d | 208 | if (dev->bus && dev->bus->uevent) { |
1da177e4 | 209 | /* have the bus specific function add its stuff */ |
312c004d | 210 | retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size); |
f9f852df KS |
211 | if (retval) |
212 | pr_debug ("%s: bus uevent() returned %d\n", | |
1da177e4 | 213 | __FUNCTION__, retval); |
1da177e4 LT |
214 | } |
215 | ||
2620efef GKH |
216 | if (dev->class && dev->class->dev_uevent) { |
217 | /* have the class specific function add its stuff */ | |
218 | retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size); | |
f9f852df KS |
219 | if (retval) |
220 | pr_debug("%s: class uevent() returned %d\n", | |
221 | __FUNCTION__, retval); | |
222 | } | |
223 | ||
224 | if (dev->type && dev->type->uevent) { | |
225 | /* have the device type specific fuction add its stuff */ | |
226 | retval = dev->type->uevent(dev, envp, num_envp, buffer, buffer_size); | |
227 | if (retval) | |
228 | pr_debug("%s: dev_type uevent() returned %d\n", | |
229 | __FUNCTION__, retval); | |
2620efef GKH |
230 | } |
231 | ||
1da177e4 LT |
232 | return retval; |
233 | } | |
234 | ||
312c004d KS |
235 | static struct kset_uevent_ops device_uevent_ops = { |
236 | .filter = dev_uevent_filter, | |
237 | .name = dev_uevent_name, | |
238 | .uevent = dev_uevent, | |
1da177e4 LT |
239 | }; |
240 | ||
a7fd6706 KS |
241 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
242 | const char *buf, size_t count) | |
243 | { | |
312c004d | 244 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
245 | return count; |
246 | } | |
247 | ||
de0ff00d GKH |
248 | static int device_add_groups(struct device *dev) |
249 | { | |
250 | int i; | |
251 | int error = 0; | |
252 | ||
253 | if (dev->groups) { | |
254 | for (i = 0; dev->groups[i]; i++) { | |
255 | error = sysfs_create_group(&dev->kobj, dev->groups[i]); | |
256 | if (error) { | |
257 | while (--i >= 0) | |
258 | sysfs_remove_group(&dev->kobj, dev->groups[i]); | |
259 | goto out; | |
260 | } | |
261 | } | |
262 | } | |
263 | out: | |
264 | return error; | |
265 | } | |
266 | ||
267 | static void device_remove_groups(struct device *dev) | |
268 | { | |
269 | int i; | |
270 | if (dev->groups) { | |
271 | for (i = 0; dev->groups[i]; i++) { | |
272 | sysfs_remove_group(&dev->kobj, dev->groups[i]); | |
273 | } | |
274 | } | |
275 | } | |
276 | ||
2620efef GKH |
277 | static int device_add_attrs(struct device *dev) |
278 | { | |
279 | struct class *class = dev->class; | |
f9f852df | 280 | struct device_type *type = dev->type; |
2620efef GKH |
281 | int error = 0; |
282 | int i; | |
283 | ||
f9f852df | 284 | if (class && class->dev_attrs) { |
2620efef GKH |
285 | for (i = 0; attr_name(class->dev_attrs[i]); i++) { |
286 | error = device_create_file(dev, &class->dev_attrs[i]); | |
287 | if (error) | |
288 | break; | |
289 | } | |
f9f852df KS |
290 | if (error) |
291 | while (--i >= 0) | |
292 | device_remove_file(dev, &class->dev_attrs[i]); | |
2620efef | 293 | } |
f9f852df KS |
294 | |
295 | if (type && type->attrs) { | |
296 | for (i = 0; attr_name(type->attrs[i]); i++) { | |
297 | error = device_create_file(dev, &type->attrs[i]); | |
298 | if (error) | |
299 | break; | |
300 | } | |
301 | if (error) | |
302 | while (--i >= 0) | |
303 | device_remove_file(dev, &type->attrs[i]); | |
304 | } | |
305 | ||
2620efef GKH |
306 | return error; |
307 | } | |
308 | ||
309 | static void device_remove_attrs(struct device *dev) | |
310 | { | |
311 | struct class *class = dev->class; | |
f9f852df | 312 | struct device_type *type = dev->type; |
2620efef GKH |
313 | int i; |
314 | ||
f9f852df | 315 | if (class && class->dev_attrs) { |
2620efef GKH |
316 | for (i = 0; attr_name(class->dev_attrs[i]); i++) |
317 | device_remove_file(dev, &class->dev_attrs[i]); | |
318 | } | |
f9f852df KS |
319 | |
320 | if (type && type->attrs) { | |
321 | for (i = 0; attr_name(type->attrs[i]); i++) | |
322 | device_remove_file(dev, &type->attrs[i]); | |
323 | } | |
2620efef GKH |
324 | } |
325 | ||
326 | ||
23681e47 GKH |
327 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
328 | char *buf) | |
329 | { | |
330 | return print_dev_t(buf, dev->devt); | |
331 | } | |
332 | ||
0863afb3 MW |
333 | /* |
334 | * devices_subsys - structure to be registered with kobject core. | |
1da177e4 LT |
335 | */ |
336 | ||
312c004d | 337 | decl_subsys(devices, &ktype_device, &device_uevent_ops); |
1da177e4 LT |
338 | |
339 | ||
340 | /** | |
341 | * device_create_file - create sysfs attribute file for device. | |
342 | * @dev: device. | |
343 | * @attr: device attribute descriptor. | |
344 | */ | |
345 | ||
346 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
347 | { | |
348 | int error = 0; | |
349 | if (get_device(dev)) { | |
350 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
351 | put_device(dev); | |
352 | } | |
353 | return error; | |
354 | } | |
355 | ||
356 | /** | |
357 | * device_remove_file - remove sysfs attribute file. | |
358 | * @dev: device. | |
359 | * @attr: device attribute descriptor. | |
360 | */ | |
361 | ||
362 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
363 | { | |
364 | if (get_device(dev)) { | |
365 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
366 | put_device(dev); | |
367 | } | |
368 | } | |
369 | ||
2589f188 GKH |
370 | /** |
371 | * device_create_bin_file - create sysfs binary attribute file for device. | |
372 | * @dev: device. | |
373 | * @attr: device binary attribute descriptor. | |
374 | */ | |
375 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
376 | { | |
377 | int error = -EINVAL; | |
378 | if (dev) | |
379 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
380 | return error; | |
381 | } | |
382 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
383 | ||
384 | /** | |
385 | * device_remove_bin_file - remove sysfs binary attribute file | |
386 | * @dev: device. | |
387 | * @attr: device binary attribute descriptor. | |
388 | */ | |
389 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
390 | { | |
391 | if (dev) | |
392 | sysfs_remove_bin_file(&dev->kobj, attr); | |
393 | } | |
394 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
395 | ||
d9a9cdfb AS |
396 | /** |
397 | * device_schedule_callback - helper to schedule a callback for a device | |
398 | * @dev: device. | |
399 | * @func: callback function to invoke later. | |
400 | * | |
401 | * Attribute methods must not unregister themselves or their parent device | |
402 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
403 | * since unregistration is mutually exclusive with driver callbacks. | |
404 | * | |
405 | * Instead methods can call this routine, which will attempt to allocate | |
406 | * and schedule a workqueue request to call back @func with @dev as its | |
407 | * argument in the workqueue's process context. @dev will be pinned until | |
408 | * @func returns. | |
409 | * | |
410 | * Returns 0 if the request was submitted, -ENOMEM if storage could not | |
411 | * be allocated. | |
412 | * | |
413 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
414 | * underlying sysfs routine (since it is intended for use by attribute | |
415 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
416 | */ | |
417 | int device_schedule_callback(struct device *dev, | |
418 | void (*func)(struct device *)) | |
419 | { | |
420 | return sysfs_schedule_callback(&dev->kobj, | |
421 | (void (*)(void *)) func, dev); | |
422 | } | |
423 | EXPORT_SYMBOL_GPL(device_schedule_callback); | |
424 | ||
34bb61f9 JB |
425 | static void klist_children_get(struct klist_node *n) |
426 | { | |
427 | struct device *dev = container_of(n, struct device, knode_parent); | |
428 | ||
429 | get_device(dev); | |
430 | } | |
431 | ||
432 | static void klist_children_put(struct klist_node *n) | |
433 | { | |
434 | struct device *dev = container_of(n, struct device, knode_parent); | |
435 | ||
436 | put_device(dev); | |
437 | } | |
438 | ||
1da177e4 LT |
439 | |
440 | /** | |
441 | * device_initialize - init device structure. | |
442 | * @dev: device. | |
443 | * | |
444 | * This prepares the device for use by other layers, | |
445 | * including adding it to the device hierarchy. | |
446 | * It is the first half of device_register(), if called by | |
447 | * that, though it can also be called separately, so one | |
448 | * may use @dev's fields (e.g. the refcount). | |
449 | */ | |
450 | ||
451 | void device_initialize(struct device *dev) | |
452 | { | |
453 | kobj_set_kset_s(dev, devices_subsys); | |
454 | kobject_init(&dev->kobj); | |
34bb61f9 JB |
455 | klist_init(&dev->klist_children, klist_children_get, |
456 | klist_children_put); | |
1da177e4 | 457 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 458 | INIT_LIST_HEAD(&dev->node); |
af70316a | 459 | init_MUTEX(&dev->sem); |
9ac7849e TH |
460 | spin_lock_init(&dev->devres_lock); |
461 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 462 | device_init_wakeup(dev, 0); |
87348136 | 463 | set_dev_node(dev, -1); |
1da177e4 LT |
464 | } |
465 | ||
40fa5422 | 466 | #ifdef CONFIG_SYSFS_DEPRECATED |
c744aeae CH |
467 | static struct kobject * get_device_parent(struct device *dev, |
468 | struct device *parent) | |
40fa5422 GKH |
469 | { |
470 | /* Set the parent to the class, not the parent device */ | |
471 | /* this keeps sysfs from having a symlink to make old udevs happy */ | |
472 | if (dev->class) | |
c744aeae | 473 | return &dev->class->subsys.kset.kobj; |
40fa5422 | 474 | else if (parent) |
c744aeae | 475 | return &parent->kobj; |
40fa5422 | 476 | |
c744aeae | 477 | return NULL; |
40fa5422 GKH |
478 | } |
479 | #else | |
c744aeae | 480 | static struct kobject * virtual_device_parent(struct device *dev) |
f0ee61a6 GKH |
481 | { |
482 | if (!dev->class) | |
c744aeae | 483 | return ERR_PTR(-ENODEV); |
f0ee61a6 GKH |
484 | |
485 | if (!dev->class->virtual_dir) { | |
486 | static struct kobject *virtual_dir = NULL; | |
487 | ||
488 | if (!virtual_dir) | |
489 | virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual"); | |
490 | dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name); | |
491 | } | |
492 | ||
c744aeae | 493 | return dev->class->virtual_dir; |
f0ee61a6 GKH |
494 | } |
495 | ||
c744aeae CH |
496 | static struct kobject * get_device_parent(struct device *dev, |
497 | struct device *parent) | |
40fa5422 | 498 | { |
40fa5422 GKH |
499 | /* if this is a class device, and has no parent, create one */ |
500 | if ((dev->class) && (parent == NULL)) { | |
c744aeae | 501 | return virtual_device_parent(dev); |
40fa5422 | 502 | } else if (parent) |
c744aeae CH |
503 | return &parent->kobj; |
504 | return NULL; | |
505 | } | |
40fa5422 | 506 | |
c744aeae CH |
507 | #endif |
508 | static int setup_parent(struct device *dev, struct device *parent) | |
509 | { | |
510 | struct kobject *kobj; | |
511 | kobj = get_device_parent(dev, parent); | |
512 | if (IS_ERR(kobj)) | |
513 | return PTR_ERR(kobj); | |
514 | if (kobj) | |
515 | dev->kobj.parent = kobj; | |
40fa5422 GKH |
516 | return 0; |
517 | } | |
40fa5422 | 518 | |
1da177e4 LT |
519 | /** |
520 | * device_add - add device to device hierarchy. | |
521 | * @dev: device. | |
522 | * | |
523 | * This is part 2 of device_register(), though may be called | |
524 | * separately _iff_ device_initialize() has been called separately. | |
525 | * | |
526 | * This adds it to the kobject hierarchy via kobject_add(), adds it | |
527 | * to the global and sibling lists for the device, then | |
528 | * adds it to the other relevant subsystems of the driver model. | |
529 | */ | |
530 | int device_add(struct device *dev) | |
531 | { | |
532 | struct device *parent = NULL; | |
e9a7d305 | 533 | char *class_name = NULL; |
c47ed219 | 534 | struct class_interface *class_intf; |
1da177e4 LT |
535 | int error = -EINVAL; |
536 | ||
537 | dev = get_device(dev); | |
538 | if (!dev || !strlen(dev->bus_id)) | |
539 | goto Error; | |
540 | ||
40fa5422 | 541 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); |
c205ef48 | 542 | |
1da177e4 LT |
543 | parent = get_device(dev->parent); |
544 | ||
40fa5422 GKH |
545 | error = setup_parent(dev, parent); |
546 | if (error) | |
547 | goto Error; | |
1da177e4 LT |
548 | |
549 | /* first, register with generic layer. */ | |
550 | kobject_set_name(&dev->kobj, "%s", dev->bus_id); | |
40fa5422 GKH |
551 | error = kobject_add(&dev->kobj); |
552 | if (error) | |
1da177e4 | 553 | goto Error; |
a7fd6706 | 554 | |
37022644 BW |
555 | /* notify platform of device entry */ |
556 | if (platform_notify) | |
557 | platform_notify(dev); | |
558 | ||
116af378 BH |
559 | /* notify clients of device entry (new way) */ |
560 | if (dev->bus) | |
561 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
562 | BUS_NOTIFY_ADD_DEVICE, dev); | |
563 | ||
a7fd6706 KS |
564 | dev->uevent_attr.attr.name = "uevent"; |
565 | dev->uevent_attr.attr.mode = S_IWUSR; | |
566 | if (dev->driver) | |
567 | dev->uevent_attr.attr.owner = dev->driver->owner; | |
568 | dev->uevent_attr.store = store_uevent; | |
a306eea4 CH |
569 | error = device_create_file(dev, &dev->uevent_attr); |
570 | if (error) | |
571 | goto attrError; | |
a7fd6706 | 572 | |
23681e47 GKH |
573 | if (MAJOR(dev->devt)) { |
574 | struct device_attribute *attr; | |
575 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
576 | if (!attr) { | |
577 | error = -ENOMEM; | |
a306eea4 | 578 | goto ueventattrError; |
23681e47 GKH |
579 | } |
580 | attr->attr.name = "dev"; | |
581 | attr->attr.mode = S_IRUGO; | |
582 | if (dev->driver) | |
583 | attr->attr.owner = dev->driver->owner; | |
584 | attr->show = show_dev; | |
585 | error = device_create_file(dev, attr); | |
586 | if (error) { | |
587 | kfree(attr); | |
a306eea4 | 588 | goto ueventattrError; |
23681e47 GKH |
589 | } |
590 | ||
591 | dev->devt_attr = attr; | |
592 | } | |
593 | ||
b9d9c82b KS |
594 | if (dev->class) { |
595 | sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj, | |
596 | "subsystem"); | |
40fa5422 GKH |
597 | /* If this is not a "fake" compatible device, then create the |
598 | * symlink from the class to the device. */ | |
599 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
600 | sysfs_create_link(&dev->class->subsys.kset.kobj, | |
601 | &dev->kobj, dev->bus_id); | |
64bb5d2c | 602 | if (parent) { |
cb360bbf CH |
603 | sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
604 | "device"); | |
f7f3461d | 605 | #ifdef CONFIG_SYSFS_DEPRECATED |
cb360bbf CH |
606 | class_name = make_class_name(dev->class->name, |
607 | &dev->kobj); | |
608 | if (class_name) | |
609 | sysfs_create_link(&dev->parent->kobj, | |
610 | &dev->kobj, class_name); | |
99ef3ef8 | 611 | #endif |
f7f3461d | 612 | } |
b9d9c82b | 613 | } |
23681e47 | 614 | |
2620efef GKH |
615 | if ((error = device_add_attrs(dev))) |
616 | goto AttrsError; | |
de0ff00d GKH |
617 | if ((error = device_add_groups(dev))) |
618 | goto GroupError; | |
1da177e4 LT |
619 | if ((error = device_pm_add(dev))) |
620 | goto PMError; | |
621 | if ((error = bus_add_device(dev))) | |
622 | goto BusError; | |
b7a3e813 KS |
623 | if (!dev->uevent_suppress) |
624 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
f70fa629 AS |
625 | if ((error = bus_attach_device(dev))) |
626 | goto AttachError; | |
1da177e4 | 627 | if (parent) |
d856f1e3 | 628 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 629 | |
5d9fd169 | 630 | if (dev->class) { |
5d9fd169 | 631 | down(&dev->class->sem); |
c47ed219 | 632 | /* tie the class to the device */ |
5d9fd169 | 633 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
634 | |
635 | /* notify any interfaces that the device is here */ | |
636 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
637 | if (class_intf->add_dev) | |
638 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
639 | up(&dev->class->sem); |
640 | } | |
1da177e4 | 641 | Done: |
e9a7d305 | 642 | kfree(class_name); |
1da177e4 LT |
643 | put_device(dev); |
644 | return error; | |
f70fa629 AS |
645 | AttachError: |
646 | bus_remove_device(dev); | |
1da177e4 LT |
647 | BusError: |
648 | device_pm_remove(dev); | |
649 | PMError: | |
116af378 BH |
650 | if (dev->bus) |
651 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
652 | BUS_NOTIFY_DEL_DEVICE, dev); | |
de0ff00d GKH |
653 | device_remove_groups(dev); |
654 | GroupError: | |
82f0cf9b | 655 | device_remove_attrs(dev); |
2620efef | 656 | AttrsError: |
23681e47 GKH |
657 | if (dev->devt_attr) { |
658 | device_remove_file(dev, dev->devt_attr); | |
659 | kfree(dev->devt_attr); | |
660 | } | |
82f0cf9b JS |
661 | |
662 | if (dev->class) { | |
663 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
664 | /* If this is not a "fake" compatible device, remove the | |
665 | * symlink from the class to the device. */ | |
666 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
667 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
668 | dev->bus_id); | |
82f0cf9b | 669 | if (parent) { |
f7f3461d | 670 | #ifdef CONFIG_SYSFS_DEPRECATED |
82f0cf9b JS |
671 | char *class_name = make_class_name(dev->class->name, |
672 | &dev->kobj); | |
673 | if (class_name) | |
674 | sysfs_remove_link(&dev->parent->kobj, | |
675 | class_name); | |
676 | kfree(class_name); | |
f7f3461d | 677 | #endif |
82f0cf9b JS |
678 | sysfs_remove_link(&dev->kobj, "device"); |
679 | } | |
82f0cf9b | 680 | } |
a306eea4 CH |
681 | ueventattrError: |
682 | device_remove_file(dev, &dev->uevent_attr); | |
23681e47 | 683 | attrError: |
312c004d | 684 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
685 | kobject_del(&dev->kobj); |
686 | Error: | |
687 | if (parent) | |
688 | put_device(parent); | |
689 | goto Done; | |
690 | } | |
691 | ||
692 | ||
693 | /** | |
694 | * device_register - register a device with the system. | |
695 | * @dev: pointer to the device structure | |
696 | * | |
697 | * This happens in two clean steps - initialize the device | |
698 | * and add it to the system. The two steps can be called | |
699 | * separately, but this is the easiest and most common. | |
700 | * I.e. you should only call the two helpers separately if | |
701 | * have a clearly defined need to use and refcount the device | |
702 | * before it is added to the hierarchy. | |
703 | */ | |
704 | ||
705 | int device_register(struct device *dev) | |
706 | { | |
707 | device_initialize(dev); | |
708 | return device_add(dev); | |
709 | } | |
710 | ||
711 | ||
712 | /** | |
713 | * get_device - increment reference count for device. | |
714 | * @dev: device. | |
715 | * | |
716 | * This simply forwards the call to kobject_get(), though | |
717 | * we do take care to provide for the case that we get a NULL | |
718 | * pointer passed in. | |
719 | */ | |
720 | ||
721 | struct device * get_device(struct device * dev) | |
722 | { | |
723 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
724 | } | |
725 | ||
726 | ||
727 | /** | |
728 | * put_device - decrement reference count. | |
729 | * @dev: device in question. | |
730 | */ | |
731 | void put_device(struct device * dev) | |
732 | { | |
733 | if (dev) | |
734 | kobject_put(&dev->kobj); | |
735 | } | |
736 | ||
737 | ||
738 | /** | |
739 | * device_del - delete device from system. | |
740 | * @dev: device. | |
741 | * | |
742 | * This is the first part of the device unregistration | |
743 | * sequence. This removes the device from the lists we control | |
744 | * from here, has it removed from the other driver model | |
745 | * subsystems it was added to in device_add(), and removes it | |
746 | * from the kobject hierarchy. | |
747 | * | |
748 | * NOTE: this should be called manually _iff_ device_add() was | |
749 | * also called manually. | |
750 | */ | |
751 | ||
752 | void device_del(struct device * dev) | |
753 | { | |
754 | struct device * parent = dev->parent; | |
c47ed219 | 755 | struct class_interface *class_intf; |
1da177e4 | 756 | |
1da177e4 | 757 | if (parent) |
d62c0f9f | 758 | klist_del(&dev->knode_parent); |
82189b98 | 759 | if (dev->devt_attr) { |
23681e47 | 760 | device_remove_file(dev, dev->devt_attr); |
82189b98 CM |
761 | kfree(dev->devt_attr); |
762 | } | |
b9d9c82b KS |
763 | if (dev->class) { |
764 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
40fa5422 GKH |
765 | /* If this is not a "fake" compatible device, remove the |
766 | * symlink from the class to the device. */ | |
767 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
768 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
769 | dev->bus_id); | |
64bb5d2c | 770 | if (parent) { |
f7f3461d | 771 | #ifdef CONFIG_SYSFS_DEPRECATED |
99ef3ef8 KS |
772 | char *class_name = make_class_name(dev->class->name, |
773 | &dev->kobj); | |
cb360bbf CH |
774 | if (class_name) |
775 | sysfs_remove_link(&dev->parent->kobj, | |
776 | class_name); | |
99ef3ef8 | 777 | kfree(class_name); |
f7f3461d | 778 | #endif |
99ef3ef8 | 779 | sysfs_remove_link(&dev->kobj, "device"); |
64bb5d2c | 780 | } |
99ef3ef8 | 781 | |
5d9fd169 | 782 | down(&dev->class->sem); |
c47ed219 GKH |
783 | /* notify any interfaces that the device is now gone */ |
784 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
785 | if (class_intf->remove_dev) | |
786 | class_intf->remove_dev(dev, class_intf); | |
787 | /* remove the device from the class list */ | |
5d9fd169 GKH |
788 | list_del_init(&dev->node); |
789 | up(&dev->class->sem); | |
b9d9c82b | 790 | } |
a7fd6706 | 791 | device_remove_file(dev, &dev->uevent_attr); |
de0ff00d | 792 | device_remove_groups(dev); |
2620efef | 793 | device_remove_attrs(dev); |
28953533 | 794 | bus_remove_device(dev); |
1da177e4 | 795 | |
2f8d16a9 TH |
796 | /* |
797 | * Some platform devices are driven without driver attached | |
798 | * and managed resources may have been acquired. Make sure | |
799 | * all resources are released. | |
800 | */ | |
801 | devres_release_all(dev); | |
802 | ||
1da177e4 LT |
803 | /* Notify the platform of the removal, in case they |
804 | * need to do anything... | |
805 | */ | |
806 | if (platform_notify_remove) | |
807 | platform_notify_remove(dev); | |
116af378 BH |
808 | if (dev->bus) |
809 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
810 | BUS_NOTIFY_DEL_DEVICE, dev); | |
1da177e4 | 811 | device_pm_remove(dev); |
312c004d | 812 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
813 | kobject_del(&dev->kobj); |
814 | if (parent) | |
815 | put_device(parent); | |
816 | } | |
817 | ||
818 | /** | |
819 | * device_unregister - unregister device from system. | |
820 | * @dev: device going away. | |
821 | * | |
822 | * We do this in two parts, like we do device_register(). First, | |
823 | * we remove it from all the subsystems with device_del(), then | |
824 | * we decrement the reference count via put_device(). If that | |
825 | * is the final reference count, the device will be cleaned up | |
826 | * via device_release() above. Otherwise, the structure will | |
827 | * stick around until the final reference to the device is dropped. | |
828 | */ | |
829 | void device_unregister(struct device * dev) | |
830 | { | |
831 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); | |
832 | device_del(dev); | |
833 | put_device(dev); | |
834 | } | |
835 | ||
836 | ||
36239577 PM |
837 | static struct device * next_device(struct klist_iter * i) |
838 | { | |
839 | struct klist_node * n = klist_next(i); | |
840 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
841 | } | |
842 | ||
1da177e4 LT |
843 | /** |
844 | * device_for_each_child - device child iterator. | |
c41455fb | 845 | * @parent: parent struct device. |
1da177e4 LT |
846 | * @data: data for the callback. |
847 | * @fn: function to be called for each device. | |
848 | * | |
c41455fb | 849 | * Iterate over @parent's child devices, and call @fn for each, |
1da177e4 LT |
850 | * passing it @data. |
851 | * | |
852 | * We check the return of @fn each time. If it returns anything | |
853 | * other than 0, we break out and return that value. | |
854 | */ | |
36239577 | 855 | int device_for_each_child(struct device * parent, void * data, |
1da177e4 LT |
856 | int (*fn)(struct device *, void *)) |
857 | { | |
36239577 | 858 | struct klist_iter i; |
1da177e4 LT |
859 | struct device * child; |
860 | int error = 0; | |
861 | ||
36239577 PM |
862 | klist_iter_init(&parent->klist_children, &i); |
863 | while ((child = next_device(&i)) && !error) | |
864 | error = fn(child, data); | |
865 | klist_iter_exit(&i); | |
1da177e4 LT |
866 | return error; |
867 | } | |
868 | ||
5ab69981 CH |
869 | /** |
870 | * device_find_child - device iterator for locating a particular device. | |
871 | * @parent: parent struct device | |
872 | * @data: Data to pass to match function | |
873 | * @match: Callback function to check device | |
874 | * | |
875 | * This is similar to the device_for_each_child() function above, but it | |
876 | * returns a reference to a device that is 'found' for later use, as | |
877 | * determined by the @match callback. | |
878 | * | |
879 | * The callback should return 0 if the device doesn't match and non-zero | |
880 | * if it does. If the callback returns non-zero and a reference to the | |
881 | * current device can be obtained, this function will return to the caller | |
882 | * and not iterate over any more devices. | |
883 | */ | |
884 | struct device * device_find_child(struct device *parent, void *data, | |
885 | int (*match)(struct device *, void *)) | |
886 | { | |
887 | struct klist_iter i; | |
888 | struct device *child; | |
889 | ||
890 | if (!parent) | |
891 | return NULL; | |
892 | ||
893 | klist_iter_init(&parent->klist_children, &i); | |
894 | while ((child = next_device(&i))) | |
895 | if (match(child, data) && get_device(child)) | |
896 | break; | |
897 | klist_iter_exit(&i); | |
898 | return child; | |
899 | } | |
900 | ||
1da177e4 LT |
901 | int __init devices_init(void) |
902 | { | |
903 | return subsystem_register(&devices_subsys); | |
904 | } | |
905 | ||
906 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 907 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
908 | |
909 | EXPORT_SYMBOL_GPL(device_initialize); | |
910 | EXPORT_SYMBOL_GPL(device_add); | |
911 | EXPORT_SYMBOL_GPL(device_register); | |
912 | ||
913 | EXPORT_SYMBOL_GPL(device_del); | |
914 | EXPORT_SYMBOL_GPL(device_unregister); | |
915 | EXPORT_SYMBOL_GPL(get_device); | |
916 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
917 | |
918 | EXPORT_SYMBOL_GPL(device_create_file); | |
919 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
920 | |
921 | ||
922 | static void device_create_release(struct device *dev) | |
923 | { | |
924 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); | |
925 | kfree(dev); | |
926 | } | |
927 | ||
928 | /** | |
929 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
930 | * @class: pointer to the struct class that this device should be registered to |
931 | * @parent: pointer to the parent struct device of this new device, if any | |
932 | * @devt: the dev_t for the char device to be added | |
933 | * @fmt: string for the device's name | |
934 | * | |
935 | * This function can be used by char device classes. A struct device | |
936 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 937 | * |
23681e47 GKH |
938 | * A "dev" file will be created, showing the dev_t for the device, if |
939 | * the dev_t is not 0,0. | |
42734daf HK |
940 | * If a pointer to a parent struct device is passed in, the newly created |
941 | * struct device will be a child of that device in sysfs. | |
942 | * The pointer to the struct device will be returned from the call. | |
943 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
944 | * pointer. |
945 | * | |
946 | * Note: the struct class passed to this function must have previously | |
947 | * been created with a call to class_create(). | |
948 | */ | |
949 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 950 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
951 | { |
952 | va_list args; | |
953 | struct device *dev = NULL; | |
954 | int retval = -ENODEV; | |
955 | ||
956 | if (class == NULL || IS_ERR(class)) | |
957 | goto error; | |
23681e47 GKH |
958 | |
959 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
960 | if (!dev) { | |
961 | retval = -ENOMEM; | |
962 | goto error; | |
963 | } | |
964 | ||
965 | dev->devt = devt; | |
966 | dev->class = class; | |
967 | dev->parent = parent; | |
968 | dev->release = device_create_release; | |
969 | ||
970 | va_start(args, fmt); | |
971 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
972 | va_end(args); | |
973 | retval = device_register(dev); | |
974 | if (retval) | |
975 | goto error; | |
976 | ||
23681e47 GKH |
977 | return dev; |
978 | ||
979 | error: | |
980 | kfree(dev); | |
981 | return ERR_PTR(retval); | |
982 | } | |
983 | EXPORT_SYMBOL_GPL(device_create); | |
984 | ||
985 | /** | |
986 | * device_destroy - removes a device that was created with device_create() | |
42734daf HK |
987 | * @class: pointer to the struct class that this device was registered with |
988 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 989 | * |
42734daf HK |
990 | * This call unregisters and cleans up a device that was created with a |
991 | * call to device_create(). | |
23681e47 GKH |
992 | */ |
993 | void device_destroy(struct class *class, dev_t devt) | |
994 | { | |
995 | struct device *dev = NULL; | |
996 | struct device *dev_tmp; | |
997 | ||
998 | down(&class->sem); | |
999 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1000 | if (dev_tmp->devt == devt) { | |
1001 | dev = dev_tmp; | |
1002 | break; | |
1003 | } | |
1004 | } | |
1005 | up(&class->sem); | |
1006 | ||
5d9fd169 | 1007 | if (dev) |
23681e47 | 1008 | device_unregister(dev); |
23681e47 GKH |
1009 | } |
1010 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1011 | |
1012 | /** | |
1013 | * device_rename - renames a device | |
1014 | * @dev: the pointer to the struct device to be renamed | |
1015 | * @new_name: the new name of the device | |
1016 | */ | |
1017 | int device_rename(struct device *dev, char *new_name) | |
1018 | { | |
1019 | char *old_class_name = NULL; | |
1020 | char *new_class_name = NULL; | |
1021 | char *old_symlink_name = NULL; | |
1022 | int error; | |
1023 | ||
1024 | dev = get_device(dev); | |
1025 | if (!dev) | |
1026 | return -EINVAL; | |
1027 | ||
1028 | pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); | |
1029 | ||
99ef3ef8 | 1030 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1031 | if ((dev->class) && (dev->parent)) |
1032 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1033 | #endif |
a2de48ca GKH |
1034 | |
1035 | if (dev->class) { | |
1036 | old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); | |
952ab431 JJ |
1037 | if (!old_symlink_name) { |
1038 | error = -ENOMEM; | |
1039 | goto out_free_old_class; | |
1040 | } | |
a2de48ca GKH |
1041 | strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE); |
1042 | } | |
1043 | ||
1044 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); | |
1045 | ||
1046 | error = kobject_rename(&dev->kobj, new_name); | |
1047 | ||
99ef3ef8 | 1048 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1049 | if (old_class_name) { |
1050 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1051 | if (new_class_name) { | |
1052 | sysfs_create_link(&dev->parent->kobj, &dev->kobj, | |
1053 | new_class_name); | |
1054 | sysfs_remove_link(&dev->parent->kobj, old_class_name); | |
1055 | } | |
1056 | } | |
99ef3ef8 KS |
1057 | #endif |
1058 | ||
a2de48ca GKH |
1059 | if (dev->class) { |
1060 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
1061 | old_symlink_name); | |
1062 | sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj, | |
1063 | dev->bus_id); | |
1064 | } | |
1065 | put_device(dev); | |
1066 | ||
a2de48ca GKH |
1067 | kfree(new_class_name); |
1068 | kfree(old_symlink_name); | |
952ab431 JJ |
1069 | out_free_old_class: |
1070 | kfree(old_class_name); | |
a2de48ca GKH |
1071 | |
1072 | return error; | |
1073 | } | |
a2807dbc | 1074 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1075 | |
1076 | static int device_move_class_links(struct device *dev, | |
1077 | struct device *old_parent, | |
1078 | struct device *new_parent) | |
1079 | { | |
f7f3461d | 1080 | int error = 0; |
8a82472f | 1081 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1082 | char *class_name; |
1083 | ||
1084 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1085 | if (!class_name) { | |
cb360bbf | 1086 | error = -ENOMEM; |
8a82472f CH |
1087 | goto out; |
1088 | } | |
1089 | if (old_parent) { | |
1090 | sysfs_remove_link(&dev->kobj, "device"); | |
1091 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1092 | } | |
c744aeae CH |
1093 | if (new_parent) { |
1094 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1095 | "device"); | |
1096 | if (error) | |
1097 | goto out; | |
1098 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1099 | class_name); | |
1100 | if (error) | |
1101 | sysfs_remove_link(&dev->kobj, "device"); | |
1102 | } | |
1103 | else | |
1104 | error = 0; | |
8a82472f CH |
1105 | out: |
1106 | kfree(class_name); | |
1107 | return error; | |
1108 | #else | |
f7f3461d GKH |
1109 | if (old_parent) |
1110 | sysfs_remove_link(&dev->kobj, "device"); | |
1111 | if (new_parent) | |
1112 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1113 | "device"); | |
1114 | return error; | |
8a82472f CH |
1115 | #endif |
1116 | } | |
1117 | ||
1118 | /** | |
1119 | * device_move - moves a device to a new parent | |
1120 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1121 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1122 | */ |
1123 | int device_move(struct device *dev, struct device *new_parent) | |
1124 | { | |
1125 | int error; | |
1126 | struct device *old_parent; | |
c744aeae | 1127 | struct kobject *new_parent_kobj; |
8a82472f CH |
1128 | |
1129 | dev = get_device(dev); | |
1130 | if (!dev) | |
1131 | return -EINVAL; | |
1132 | ||
8a82472f | 1133 | new_parent = get_device(new_parent); |
c744aeae CH |
1134 | new_parent_kobj = get_device_parent (dev, new_parent); |
1135 | if (IS_ERR(new_parent_kobj)) { | |
1136 | error = PTR_ERR(new_parent_kobj); | |
1137 | put_device(new_parent); | |
8a82472f CH |
1138 | goto out; |
1139 | } | |
1140 | pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, | |
c744aeae CH |
1141 | new_parent ? new_parent->bus_id : "<NULL>"); |
1142 | error = kobject_move(&dev->kobj, new_parent_kobj); | |
8a82472f CH |
1143 | if (error) { |
1144 | put_device(new_parent); | |
1145 | goto out; | |
1146 | } | |
1147 | old_parent = dev->parent; | |
1148 | dev->parent = new_parent; | |
1149 | if (old_parent) | |
acf02d23 | 1150 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1151 | if (new_parent) |
1152 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1153 | if (!dev->class) |
1154 | goto out_put; | |
1155 | error = device_move_class_links(dev, old_parent, new_parent); | |
1156 | if (error) { | |
1157 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1158 | device_move_class_links(dev, new_parent, old_parent); | |
1159 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1160 | if (new_parent) |
1161 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1162 | if (old_parent) |
1163 | klist_add_tail(&dev->knode_parent, | |
1164 | &old_parent->klist_children); | |
1165 | } | |
1166 | put_device(new_parent); | |
1167 | goto out; | |
1168 | } | |
1169 | out_put: | |
1170 | put_device(old_parent); | |
1171 | out: | |
1172 | put_device(dev); | |
1173 | return error; | |
1174 | } | |
1175 | ||
1176 | EXPORT_SYMBOL_GPL(device_move); |