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); | |
2c7afd12 KS |
183 | if (path) { |
184 | add_uevent_var(envp, num_envp, &i, | |
185 | buffer, buffer_size, &length, | |
186 | "PHYSDEVPATH=%s", path); | |
187 | kfree(path); | |
188 | } | |
239378f1 KS |
189 | |
190 | add_uevent_var(envp, num_envp, &i, | |
191 | buffer, buffer_size, &length, | |
192 | "PHYSDEVBUS=%s", parent->bus->name); | |
193 | ||
194 | if (parent->driver) | |
195 | add_uevent_var(envp, num_envp, &i, | |
196 | buffer, buffer_size, &length, | |
197 | "PHYSDEVDRIVER=%s", parent->driver->name); | |
198 | } | |
199 | } else if (dev->bus) { | |
312c004d KS |
200 | add_uevent_var(envp, num_envp, &i, |
201 | buffer, buffer_size, &length, | |
239378f1 KS |
202 | "PHYSDEVBUS=%s", dev->bus->name); |
203 | ||
204 | if (dev->driver) | |
205 | add_uevent_var(envp, num_envp, &i, | |
206 | buffer, buffer_size, &length, | |
207 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
d81d9d6b | 208 | } |
239378f1 | 209 | #endif |
1da177e4 LT |
210 | |
211 | /* terminate, set to next free slot, shrink available space */ | |
212 | envp[i] = NULL; | |
213 | envp = &envp[i]; | |
214 | num_envp -= i; | |
215 | buffer = &buffer[length]; | |
216 | buffer_size -= length; | |
217 | ||
312c004d | 218 | if (dev->bus && dev->bus->uevent) { |
1da177e4 | 219 | /* have the bus specific function add its stuff */ |
312c004d | 220 | retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size); |
f9f852df KS |
221 | if (retval) |
222 | pr_debug ("%s: bus uevent() returned %d\n", | |
1da177e4 | 223 | __FUNCTION__, retval); |
1da177e4 LT |
224 | } |
225 | ||
2620efef GKH |
226 | if (dev->class && dev->class->dev_uevent) { |
227 | /* have the class specific function add its stuff */ | |
228 | retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size); | |
f9f852df KS |
229 | if (retval) |
230 | pr_debug("%s: class uevent() returned %d\n", | |
231 | __FUNCTION__, retval); | |
232 | } | |
233 | ||
234 | if (dev->type && dev->type->uevent) { | |
235 | /* have the device type specific fuction add its stuff */ | |
236 | retval = dev->type->uevent(dev, envp, num_envp, buffer, buffer_size); | |
237 | if (retval) | |
238 | pr_debug("%s: dev_type uevent() returned %d\n", | |
239 | __FUNCTION__, retval); | |
2620efef GKH |
240 | } |
241 | ||
1da177e4 LT |
242 | return retval; |
243 | } | |
244 | ||
312c004d KS |
245 | static struct kset_uevent_ops device_uevent_ops = { |
246 | .filter = dev_uevent_filter, | |
247 | .name = dev_uevent_name, | |
248 | .uevent = dev_uevent, | |
1da177e4 LT |
249 | }; |
250 | ||
16574dcc KS |
251 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
252 | char *buf) | |
253 | { | |
254 | struct kobject *top_kobj; | |
255 | struct kset *kset; | |
256 | char *envp[32]; | |
c7308c81 | 257 | char *data = NULL; |
16574dcc KS |
258 | char *pos; |
259 | int i; | |
260 | size_t count = 0; | |
261 | int retval; | |
262 | ||
263 | /* search the kset, the device belongs to */ | |
264 | top_kobj = &dev->kobj; | |
265 | if (!top_kobj->kset && top_kobj->parent) { | |
266 | do { | |
267 | top_kobj = top_kobj->parent; | |
268 | } while (!top_kobj->kset && top_kobj->parent); | |
269 | } | |
270 | if (!top_kobj->kset) | |
271 | goto out; | |
272 | kset = top_kobj->kset; | |
273 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
274 | goto out; | |
275 | ||
276 | /* respect filter */ | |
277 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
278 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
279 | goto out; | |
280 | ||
c7308c81 GKH |
281 | data = (char *)get_zeroed_page(GFP_KERNEL); |
282 | if (!data) | |
283 | return -ENOMEM; | |
284 | ||
16574dcc KS |
285 | /* let the kset specific function add its keys */ |
286 | pos = data; | |
287 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, | |
288 | envp, ARRAY_SIZE(envp), | |
289 | pos, PAGE_SIZE); | |
290 | if (retval) | |
291 | goto out; | |
292 | ||
293 | /* copy keys to file */ | |
294 | for (i = 0; envp[i]; i++) { | |
295 | pos = &buf[count]; | |
296 | count += sprintf(pos, "%s\n", envp[i]); | |
297 | } | |
298 | out: | |
c7308c81 | 299 | free_page((unsigned long)data); |
16574dcc KS |
300 | return count; |
301 | } | |
302 | ||
a7fd6706 KS |
303 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
304 | const char *buf, size_t count) | |
305 | { | |
22af74f3 KS |
306 | if (memcmp(buf, "add", 3) != 0) |
307 | dev_err(dev, "uevent: unsupported action-string; this will " | |
308 | "be ignored in a future kernel version"); | |
312c004d | 309 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
a7fd6706 KS |
310 | return count; |
311 | } | |
312 | ||
ad6a1e1c TH |
313 | static struct device_attribute uevent_attr = |
314 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
315 | ||
621a1672 DT |
316 | static int device_add_attributes(struct device *dev, |
317 | struct device_attribute *attrs) | |
de0ff00d | 318 | { |
621a1672 | 319 | int error = 0; |
de0ff00d | 320 | int i; |
621a1672 DT |
321 | |
322 | if (attrs) { | |
323 | for (i = 0; attr_name(attrs[i]); i++) { | |
324 | error = device_create_file(dev, &attrs[i]); | |
325 | if (error) | |
326 | break; | |
327 | } | |
328 | if (error) | |
329 | while (--i >= 0) | |
330 | device_remove_file(dev, &attrs[i]); | |
331 | } | |
332 | return error; | |
333 | } | |
334 | ||
335 | static void device_remove_attributes(struct device *dev, | |
336 | struct device_attribute *attrs) | |
337 | { | |
338 | int i; | |
339 | ||
340 | if (attrs) | |
341 | for (i = 0; attr_name(attrs[i]); i++) | |
342 | device_remove_file(dev, &attrs[i]); | |
343 | } | |
344 | ||
345 | static int device_add_groups(struct device *dev, | |
346 | struct attribute_group **groups) | |
347 | { | |
de0ff00d | 348 | int error = 0; |
621a1672 | 349 | int i; |
de0ff00d | 350 | |
621a1672 DT |
351 | if (groups) { |
352 | for (i = 0; groups[i]; i++) { | |
353 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
354 | if (error) { |
355 | while (--i >= 0) | |
621a1672 DT |
356 | sysfs_remove_group(&dev->kobj, groups[i]); |
357 | break; | |
de0ff00d GKH |
358 | } |
359 | } | |
360 | } | |
de0ff00d GKH |
361 | return error; |
362 | } | |
363 | ||
621a1672 DT |
364 | static void device_remove_groups(struct device *dev, |
365 | struct attribute_group **groups) | |
de0ff00d GKH |
366 | { |
367 | int i; | |
621a1672 DT |
368 | |
369 | if (groups) | |
370 | for (i = 0; groups[i]; i++) | |
371 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
372 | } |
373 | ||
2620efef GKH |
374 | static int device_add_attrs(struct device *dev) |
375 | { | |
376 | struct class *class = dev->class; | |
f9f852df | 377 | struct device_type *type = dev->type; |
621a1672 | 378 | int error; |
2620efef | 379 | |
621a1672 DT |
380 | if (class) { |
381 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 382 | if (error) |
621a1672 | 383 | return error; |
2620efef | 384 | } |
f9f852df | 385 | |
621a1672 DT |
386 | if (type) { |
387 | error = device_add_groups(dev, type->groups); | |
f9f852df | 388 | if (error) |
621a1672 | 389 | goto err_remove_class_attrs; |
f9f852df KS |
390 | } |
391 | ||
621a1672 DT |
392 | error = device_add_groups(dev, dev->groups); |
393 | if (error) | |
394 | goto err_remove_type_groups; | |
395 | ||
396 | return 0; | |
397 | ||
398 | err_remove_type_groups: | |
399 | if (type) | |
400 | device_remove_groups(dev, type->groups); | |
401 | err_remove_class_attrs: | |
402 | if (class) | |
403 | device_remove_attributes(dev, class->dev_attrs); | |
404 | ||
2620efef GKH |
405 | return error; |
406 | } | |
407 | ||
408 | static void device_remove_attrs(struct device *dev) | |
409 | { | |
410 | struct class *class = dev->class; | |
f9f852df | 411 | struct device_type *type = dev->type; |
2620efef | 412 | |
621a1672 | 413 | device_remove_groups(dev, dev->groups); |
f9f852df | 414 | |
621a1672 DT |
415 | if (type) |
416 | device_remove_groups(dev, type->groups); | |
417 | ||
418 | if (class) | |
419 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
420 | } |
421 | ||
422 | ||
23681e47 GKH |
423 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
424 | char *buf) | |
425 | { | |
426 | return print_dev_t(buf, dev->devt); | |
427 | } | |
428 | ||
ad6a1e1c TH |
429 | static struct device_attribute devt_attr = |
430 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
431 | ||
0863afb3 MW |
432 | /* |
433 | * devices_subsys - structure to be registered with kobject core. | |
1da177e4 LT |
434 | */ |
435 | ||
312c004d | 436 | decl_subsys(devices, &ktype_device, &device_uevent_ops); |
1da177e4 LT |
437 | |
438 | ||
439 | /** | |
440 | * device_create_file - create sysfs attribute file for device. | |
441 | * @dev: device. | |
442 | * @attr: device attribute descriptor. | |
443 | */ | |
444 | ||
445 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
446 | { | |
447 | int error = 0; | |
448 | if (get_device(dev)) { | |
449 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
450 | put_device(dev); | |
451 | } | |
452 | return error; | |
453 | } | |
454 | ||
455 | /** | |
456 | * device_remove_file - remove sysfs attribute file. | |
457 | * @dev: device. | |
458 | * @attr: device attribute descriptor. | |
459 | */ | |
460 | ||
461 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
462 | { | |
463 | if (get_device(dev)) { | |
464 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
465 | put_device(dev); | |
466 | } | |
467 | } | |
468 | ||
2589f188 GKH |
469 | /** |
470 | * device_create_bin_file - create sysfs binary attribute file for device. | |
471 | * @dev: device. | |
472 | * @attr: device binary attribute descriptor. | |
473 | */ | |
474 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
475 | { | |
476 | int error = -EINVAL; | |
477 | if (dev) | |
478 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
479 | return error; | |
480 | } | |
481 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
482 | ||
483 | /** | |
484 | * device_remove_bin_file - remove sysfs binary attribute file | |
485 | * @dev: device. | |
486 | * @attr: device binary attribute descriptor. | |
487 | */ | |
488 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
489 | { | |
490 | if (dev) | |
491 | sysfs_remove_bin_file(&dev->kobj, attr); | |
492 | } | |
493 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
494 | ||
d9a9cdfb | 495 | /** |
523ded71 | 496 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
497 | * @dev: device. |
498 | * @func: callback function to invoke later. | |
523ded71 | 499 | * @owner: module owning the callback routine |
d9a9cdfb AS |
500 | * |
501 | * Attribute methods must not unregister themselves or their parent device | |
502 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
503 | * since unregistration is mutually exclusive with driver callbacks. | |
504 | * | |
505 | * Instead methods can call this routine, which will attempt to allocate | |
506 | * and schedule a workqueue request to call back @func with @dev as its | |
507 | * argument in the workqueue's process context. @dev will be pinned until | |
508 | * @func returns. | |
509 | * | |
523ded71 AS |
510 | * This routine is usually called via the inline device_schedule_callback(), |
511 | * which automatically sets @owner to THIS_MODULE. | |
512 | * | |
d9a9cdfb | 513 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 514 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
515 | * |
516 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
517 | * underlying sysfs routine (since it is intended for use by attribute | |
518 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
519 | */ | |
523ded71 AS |
520 | int device_schedule_callback_owner(struct device *dev, |
521 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
522 | { |
523 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 524 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 525 | } |
523ded71 | 526 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 527 | |
34bb61f9 JB |
528 | static void klist_children_get(struct klist_node *n) |
529 | { | |
530 | struct device *dev = container_of(n, struct device, knode_parent); | |
531 | ||
532 | get_device(dev); | |
533 | } | |
534 | ||
535 | static void klist_children_put(struct klist_node *n) | |
536 | { | |
537 | struct device *dev = container_of(n, struct device, knode_parent); | |
538 | ||
539 | put_device(dev); | |
540 | } | |
541 | ||
1da177e4 LT |
542 | |
543 | /** | |
544 | * device_initialize - init device structure. | |
545 | * @dev: device. | |
546 | * | |
547 | * This prepares the device for use by other layers, | |
548 | * including adding it to the device hierarchy. | |
549 | * It is the first half of device_register(), if called by | |
550 | * that, though it can also be called separately, so one | |
551 | * may use @dev's fields (e.g. the refcount). | |
552 | */ | |
553 | ||
554 | void device_initialize(struct device *dev) | |
555 | { | |
556 | kobj_set_kset_s(dev, devices_subsys); | |
557 | kobject_init(&dev->kobj); | |
34bb61f9 JB |
558 | klist_init(&dev->klist_children, klist_children_get, |
559 | klist_children_put); | |
1da177e4 | 560 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 561 | INIT_LIST_HEAD(&dev->node); |
af70316a | 562 | init_MUTEX(&dev->sem); |
9ac7849e TH |
563 | spin_lock_init(&dev->devres_lock); |
564 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 565 | device_init_wakeup(dev, 0); |
87348136 | 566 | set_dev_node(dev, -1); |
1da177e4 LT |
567 | } |
568 | ||
40fa5422 | 569 | #ifdef CONFIG_SYSFS_DEPRECATED |
c744aeae CH |
570 | static struct kobject * get_device_parent(struct device *dev, |
571 | struct device *parent) | |
40fa5422 GKH |
572 | { |
573 | /* Set the parent to the class, not the parent device */ | |
574 | /* this keeps sysfs from having a symlink to make old udevs happy */ | |
575 | if (dev->class) | |
823bccfc | 576 | return &dev->class->subsys.kobj; |
40fa5422 | 577 | else if (parent) |
c744aeae | 578 | return &parent->kobj; |
40fa5422 | 579 | |
c744aeae | 580 | return NULL; |
40fa5422 GKH |
581 | } |
582 | #else | |
86406245 | 583 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 584 | { |
86406245 | 585 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 586 | |
86406245 | 587 | if (!virtual_dir) |
823bccfc | 588 | virtual_dir = kobject_add_dir(&devices_subsys.kobj, "virtual"); |
f0ee61a6 | 589 | |
86406245 | 590 | return virtual_dir; |
f0ee61a6 GKH |
591 | } |
592 | ||
c744aeae CH |
593 | static struct kobject * get_device_parent(struct device *dev, |
594 | struct device *parent) | |
40fa5422 | 595 | { |
86406245 KS |
596 | if (dev->class) { |
597 | struct kobject *kobj = NULL; | |
598 | struct kobject *parent_kobj; | |
599 | struct kobject *k; | |
600 | ||
601 | /* | |
602 | * If we have no parent, we live in "virtual". | |
603 | * Class-devices with a bus-device as parent, live | |
604 | * in a class-directory to prevent namespace collisions. | |
605 | */ | |
606 | if (parent == NULL) | |
607 | parent_kobj = virtual_device_parent(dev); | |
608 | else if (parent->class) | |
609 | return &parent->kobj; | |
610 | else | |
611 | parent_kobj = &parent->kobj; | |
612 | ||
613 | /* find our class-directory at the parent and reference it */ | |
614 | spin_lock(&dev->class->class_dirs.list_lock); | |
615 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
616 | if (k->parent == parent_kobj) { | |
617 | kobj = kobject_get(k); | |
618 | break; | |
619 | } | |
620 | spin_unlock(&dev->class->class_dirs.list_lock); | |
621 | if (kobj) | |
622 | return kobj; | |
623 | ||
624 | /* or create a new class-directory at the parent device */ | |
625 | return kobject_kset_add_dir(&dev->class->class_dirs, | |
626 | parent_kobj, dev->class->name); | |
627 | } | |
628 | ||
629 | if (parent) | |
c744aeae CH |
630 | return &parent->kobj; |
631 | return NULL; | |
632 | } | |
c744aeae | 633 | #endif |
86406245 | 634 | |
c744aeae CH |
635 | static int setup_parent(struct device *dev, struct device *parent) |
636 | { | |
637 | struct kobject *kobj; | |
638 | kobj = get_device_parent(dev, parent); | |
639 | if (IS_ERR(kobj)) | |
640 | return PTR_ERR(kobj); | |
641 | if (kobj) | |
642 | dev->kobj.parent = kobj; | |
40fa5422 GKH |
643 | return 0; |
644 | } | |
40fa5422 | 645 | |
1da177e4 LT |
646 | /** |
647 | * device_add - add device to device hierarchy. | |
648 | * @dev: device. | |
649 | * | |
650 | * This is part 2 of device_register(), though may be called | |
651 | * separately _iff_ device_initialize() has been called separately. | |
652 | * | |
653 | * This adds it to the kobject hierarchy via kobject_add(), adds it | |
654 | * to the global and sibling lists for the device, then | |
655 | * adds it to the other relevant subsystems of the driver model. | |
656 | */ | |
657 | int device_add(struct device *dev) | |
658 | { | |
659 | struct device *parent = NULL; | |
e9a7d305 | 660 | char *class_name = NULL; |
c47ed219 | 661 | struct class_interface *class_intf; |
1da177e4 LT |
662 | int error = -EINVAL; |
663 | ||
664 | dev = get_device(dev); | |
665 | if (!dev || !strlen(dev->bus_id)) | |
666 | goto Error; | |
667 | ||
40fa5422 | 668 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); |
c205ef48 | 669 | |
1da177e4 | 670 | parent = get_device(dev->parent); |
40fa5422 GKH |
671 | error = setup_parent(dev, parent); |
672 | if (error) | |
673 | goto Error; | |
1da177e4 LT |
674 | |
675 | /* first, register with generic layer. */ | |
676 | kobject_set_name(&dev->kobj, "%s", dev->bus_id); | |
40fa5422 GKH |
677 | error = kobject_add(&dev->kobj); |
678 | if (error) | |
1da177e4 | 679 | goto Error; |
a7fd6706 | 680 | |
37022644 BW |
681 | /* notify platform of device entry */ |
682 | if (platform_notify) | |
683 | platform_notify(dev); | |
684 | ||
116af378 BH |
685 | /* notify clients of device entry (new way) */ |
686 | if (dev->bus) | |
687 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
688 | BUS_NOTIFY_ADD_DEVICE, dev); | |
689 | ||
ad6a1e1c | 690 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
691 | if (error) |
692 | goto attrError; | |
a7fd6706 | 693 | |
23681e47 | 694 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
695 | error = device_create_file(dev, &devt_attr); |
696 | if (error) | |
a306eea4 | 697 | goto ueventattrError; |
23681e47 GKH |
698 | } |
699 | ||
b9d9c82b | 700 | if (dev->class) { |
823bccfc | 701 | sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, |
b9d9c82b | 702 | "subsystem"); |
40fa5422 GKH |
703 | /* If this is not a "fake" compatible device, then create the |
704 | * symlink from the class to the device. */ | |
823bccfc GKH |
705 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
706 | sysfs_create_link(&dev->class->subsys.kobj, | |
40fa5422 | 707 | &dev->kobj, dev->bus_id); |
64bb5d2c | 708 | if (parent) { |
cb360bbf CH |
709 | sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
710 | "device"); | |
f7f3461d | 711 | #ifdef CONFIG_SYSFS_DEPRECATED |
cb360bbf CH |
712 | class_name = make_class_name(dev->class->name, |
713 | &dev->kobj); | |
714 | if (class_name) | |
715 | sysfs_create_link(&dev->parent->kobj, | |
716 | &dev->kobj, class_name); | |
99ef3ef8 | 717 | #endif |
f7f3461d | 718 | } |
b9d9c82b | 719 | } |
23681e47 | 720 | |
dc0afa83 CH |
721 | error = device_add_attrs(dev); |
722 | if (error) | |
2620efef | 723 | goto AttrsError; |
dc0afa83 CH |
724 | error = device_pm_add(dev); |
725 | if (error) | |
1da177e4 | 726 | goto PMError; |
dc0afa83 CH |
727 | error = bus_add_device(dev); |
728 | if (error) | |
1da177e4 | 729 | goto BusError; |
83b5fb4c | 730 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 731 | bus_attach_device(dev); |
1da177e4 | 732 | if (parent) |
d856f1e3 | 733 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 734 | |
5d9fd169 | 735 | if (dev->class) { |
5d9fd169 | 736 | down(&dev->class->sem); |
c47ed219 | 737 | /* tie the class to the device */ |
5d9fd169 | 738 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
739 | |
740 | /* notify any interfaces that the device is here */ | |
741 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
742 | if (class_intf->add_dev) | |
743 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
744 | up(&dev->class->sem); |
745 | } | |
1da177e4 | 746 | Done: |
621a1672 | 747 | kfree(class_name); |
1da177e4 LT |
748 | put_device(dev); |
749 | return error; | |
750 | BusError: | |
751 | device_pm_remove(dev); | |
752 | PMError: | |
116af378 BH |
753 | if (dev->bus) |
754 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
755 | BUS_NOTIFY_DEL_DEVICE, dev); | |
82f0cf9b | 756 | device_remove_attrs(dev); |
2620efef | 757 | AttrsError: |
ad6a1e1c TH |
758 | if (MAJOR(dev->devt)) |
759 | device_remove_file(dev, &devt_attr); | |
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. */ | |
823bccfc GKH |
765 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
766 | sysfs_remove_link(&dev->class->subsys.kobj, | |
82f0cf9b | 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 | 780 | ueventattrError: |
ad6a1e1c | 781 | device_remove_file(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); |
ad6a1e1c TH |
858 | if (MAJOR(dev->devt)) |
859 | device_remove_file(dev, &devt_attr); | |
b9d9c82b KS |
860 | if (dev->class) { |
861 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
40fa5422 GKH |
862 | /* If this is not a "fake" compatible device, remove the |
863 | * symlink from the class to the device. */ | |
823bccfc GKH |
864 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
865 | sysfs_remove_link(&dev->class->subsys.kobj, | |
40fa5422 | 866 | dev->bus_id); |
64bb5d2c | 867 | if (parent) { |
f7f3461d | 868 | #ifdef CONFIG_SYSFS_DEPRECATED |
99ef3ef8 KS |
869 | char *class_name = make_class_name(dev->class->name, |
870 | &dev->kobj); | |
cb360bbf CH |
871 | if (class_name) |
872 | sysfs_remove_link(&dev->parent->kobj, | |
873 | class_name); | |
99ef3ef8 | 874 | kfree(class_name); |
f7f3461d | 875 | #endif |
99ef3ef8 | 876 | sysfs_remove_link(&dev->kobj, "device"); |
64bb5d2c | 877 | } |
99ef3ef8 | 878 | |
5d9fd169 | 879 | down(&dev->class->sem); |
c47ed219 GKH |
880 | /* notify any interfaces that the device is now gone */ |
881 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
882 | if (class_intf->remove_dev) | |
883 | class_intf->remove_dev(dev, class_intf); | |
884 | /* remove the device from the class list */ | |
5d9fd169 GKH |
885 | list_del_init(&dev->node); |
886 | up(&dev->class->sem); | |
86406245 KS |
887 | |
888 | /* If we live in a parent class-directory, unreference it */ | |
889 | if (dev->kobj.parent->kset == &dev->class->class_dirs) { | |
890 | struct device *d; | |
891 | int other = 0; | |
892 | ||
893 | /* | |
894 | * if we are the last child of our class, delete | |
895 | * our class-directory at this parent | |
896 | */ | |
897 | down(&dev->class->sem); | |
898 | list_for_each_entry(d, &dev->class->devices, node) { | |
899 | if (d == dev) | |
900 | continue; | |
901 | if (d->kobj.parent == dev->kobj.parent) { | |
902 | other = 1; | |
903 | break; | |
904 | } | |
905 | } | |
906 | if (!other) | |
907 | kobject_del(dev->kobj.parent); | |
908 | ||
909 | kobject_put(dev->kobj.parent); | |
910 | up(&dev->class->sem); | |
911 | } | |
b9d9c82b | 912 | } |
ad6a1e1c | 913 | device_remove_file(dev, &uevent_attr); |
2620efef | 914 | device_remove_attrs(dev); |
28953533 | 915 | bus_remove_device(dev); |
1da177e4 | 916 | |
2f8d16a9 TH |
917 | /* |
918 | * Some platform devices are driven without driver attached | |
919 | * and managed resources may have been acquired. Make sure | |
920 | * all resources are released. | |
921 | */ | |
922 | devres_release_all(dev); | |
923 | ||
1da177e4 LT |
924 | /* Notify the platform of the removal, in case they |
925 | * need to do anything... | |
926 | */ | |
927 | if (platform_notify_remove) | |
928 | platform_notify_remove(dev); | |
116af378 BH |
929 | if (dev->bus) |
930 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
931 | BUS_NOTIFY_DEL_DEVICE, dev); | |
1da177e4 | 932 | device_pm_remove(dev); |
312c004d | 933 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
934 | kobject_del(&dev->kobj); |
935 | if (parent) | |
936 | put_device(parent); | |
937 | } | |
938 | ||
939 | /** | |
940 | * device_unregister - unregister device from system. | |
941 | * @dev: device going away. | |
942 | * | |
943 | * We do this in two parts, like we do device_register(). First, | |
944 | * we remove it from all the subsystems with device_del(), then | |
945 | * we decrement the reference count via put_device(). If that | |
946 | * is the final reference count, the device will be cleaned up | |
947 | * via device_release() above. Otherwise, the structure will | |
948 | * stick around until the final reference to the device is dropped. | |
949 | */ | |
950 | void device_unregister(struct device * dev) | |
951 | { | |
952 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); | |
953 | device_del(dev); | |
954 | put_device(dev); | |
955 | } | |
956 | ||
957 | ||
36239577 PM |
958 | static struct device * next_device(struct klist_iter * i) |
959 | { | |
960 | struct klist_node * n = klist_next(i); | |
961 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
962 | } | |
963 | ||
1da177e4 LT |
964 | /** |
965 | * device_for_each_child - device child iterator. | |
c41455fb | 966 | * @parent: parent struct device. |
1da177e4 LT |
967 | * @data: data for the callback. |
968 | * @fn: function to be called for each device. | |
969 | * | |
c41455fb | 970 | * Iterate over @parent's child devices, and call @fn for each, |
1da177e4 LT |
971 | * passing it @data. |
972 | * | |
973 | * We check the return of @fn each time. If it returns anything | |
974 | * other than 0, we break out and return that value. | |
975 | */ | |
36239577 | 976 | int device_for_each_child(struct device * parent, void * data, |
1da177e4 LT |
977 | int (*fn)(struct device *, void *)) |
978 | { | |
36239577 | 979 | struct klist_iter i; |
1da177e4 LT |
980 | struct device * child; |
981 | int error = 0; | |
982 | ||
36239577 PM |
983 | klist_iter_init(&parent->klist_children, &i); |
984 | while ((child = next_device(&i)) && !error) | |
985 | error = fn(child, data); | |
986 | klist_iter_exit(&i); | |
1da177e4 LT |
987 | return error; |
988 | } | |
989 | ||
5ab69981 CH |
990 | /** |
991 | * device_find_child - device iterator for locating a particular device. | |
992 | * @parent: parent struct device | |
993 | * @data: Data to pass to match function | |
994 | * @match: Callback function to check device | |
995 | * | |
996 | * This is similar to the device_for_each_child() function above, but it | |
997 | * returns a reference to a device that is 'found' for later use, as | |
998 | * determined by the @match callback. | |
999 | * | |
1000 | * The callback should return 0 if the device doesn't match and non-zero | |
1001 | * if it does. If the callback returns non-zero and a reference to the | |
1002 | * current device can be obtained, this function will return to the caller | |
1003 | * and not iterate over any more devices. | |
1004 | */ | |
1005 | struct device * device_find_child(struct device *parent, void *data, | |
1006 | int (*match)(struct device *, void *)) | |
1007 | { | |
1008 | struct klist_iter i; | |
1009 | struct device *child; | |
1010 | ||
1011 | if (!parent) | |
1012 | return NULL; | |
1013 | ||
1014 | klist_iter_init(&parent->klist_children, &i); | |
1015 | while ((child = next_device(&i))) | |
1016 | if (match(child, data) && get_device(child)) | |
1017 | break; | |
1018 | klist_iter_exit(&i); | |
1019 | return child; | |
1020 | } | |
1021 | ||
1da177e4 LT |
1022 | int __init devices_init(void) |
1023 | { | |
1024 | return subsystem_register(&devices_subsys); | |
1025 | } | |
1026 | ||
1027 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1028 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1029 | |
1030 | EXPORT_SYMBOL_GPL(device_initialize); | |
1031 | EXPORT_SYMBOL_GPL(device_add); | |
1032 | EXPORT_SYMBOL_GPL(device_register); | |
1033 | ||
1034 | EXPORT_SYMBOL_GPL(device_del); | |
1035 | EXPORT_SYMBOL_GPL(device_unregister); | |
1036 | EXPORT_SYMBOL_GPL(get_device); | |
1037 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1038 | |
1039 | EXPORT_SYMBOL_GPL(device_create_file); | |
1040 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1041 | |
1042 | ||
1043 | static void device_create_release(struct device *dev) | |
1044 | { | |
1045 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); | |
1046 | kfree(dev); | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1051 | * @class: pointer to the struct class that this device should be registered to |
1052 | * @parent: pointer to the parent struct device of this new device, if any | |
1053 | * @devt: the dev_t for the char device to be added | |
1054 | * @fmt: string for the device's name | |
1055 | * | |
1056 | * This function can be used by char device classes. A struct device | |
1057 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1058 | * |
23681e47 GKH |
1059 | * A "dev" file will be created, showing the dev_t for the device, if |
1060 | * the dev_t is not 0,0. | |
42734daf HK |
1061 | * If a pointer to a parent struct device is passed in, the newly created |
1062 | * struct device will be a child of that device in sysfs. | |
1063 | * The pointer to the struct device will be returned from the call. | |
1064 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1065 | * pointer. |
1066 | * | |
1067 | * Note: the struct class passed to this function must have previously | |
1068 | * been created with a call to class_create(). | |
1069 | */ | |
1070 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1071 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1072 | { |
1073 | va_list args; | |
1074 | struct device *dev = NULL; | |
1075 | int retval = -ENODEV; | |
1076 | ||
1077 | if (class == NULL || IS_ERR(class)) | |
1078 | goto error; | |
23681e47 GKH |
1079 | |
1080 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1081 | if (!dev) { | |
1082 | retval = -ENOMEM; | |
1083 | goto error; | |
1084 | } | |
1085 | ||
1086 | dev->devt = devt; | |
1087 | dev->class = class; | |
1088 | dev->parent = parent; | |
1089 | dev->release = device_create_release; | |
1090 | ||
1091 | va_start(args, fmt); | |
1092 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1093 | va_end(args); | |
1094 | retval = device_register(dev); | |
1095 | if (retval) | |
1096 | goto error; | |
1097 | ||
23681e47 GKH |
1098 | return dev; |
1099 | ||
1100 | error: | |
1101 | kfree(dev); | |
1102 | return ERR_PTR(retval); | |
1103 | } | |
1104 | EXPORT_SYMBOL_GPL(device_create); | |
1105 | ||
1106 | /** | |
1107 | * device_destroy - removes a device that was created with device_create() | |
42734daf HK |
1108 | * @class: pointer to the struct class that this device was registered with |
1109 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 1110 | * |
42734daf HK |
1111 | * This call unregisters and cleans up a device that was created with a |
1112 | * call to device_create(). | |
23681e47 GKH |
1113 | */ |
1114 | void device_destroy(struct class *class, dev_t devt) | |
1115 | { | |
1116 | struct device *dev = NULL; | |
1117 | struct device *dev_tmp; | |
1118 | ||
1119 | down(&class->sem); | |
1120 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1121 | if (dev_tmp->devt == devt) { | |
1122 | dev = dev_tmp; | |
1123 | break; | |
1124 | } | |
1125 | } | |
1126 | up(&class->sem); | |
1127 | ||
5d9fd169 | 1128 | if (dev) |
23681e47 | 1129 | device_unregister(dev); |
23681e47 GKH |
1130 | } |
1131 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1132 | |
1133 | /** | |
1134 | * device_rename - renames a device | |
1135 | * @dev: the pointer to the struct device to be renamed | |
1136 | * @new_name: the new name of the device | |
1137 | */ | |
1138 | int device_rename(struct device *dev, char *new_name) | |
1139 | { | |
1140 | char *old_class_name = NULL; | |
1141 | char *new_class_name = NULL; | |
1142 | char *old_symlink_name = NULL; | |
1143 | int error; | |
1144 | ||
1145 | dev = get_device(dev); | |
1146 | if (!dev) | |
1147 | return -EINVAL; | |
1148 | ||
1149 | pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); | |
1150 | ||
99ef3ef8 | 1151 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1152 | if ((dev->class) && (dev->parent)) |
1153 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1154 | #endif |
a2de48ca GKH |
1155 | |
1156 | if (dev->class) { | |
1157 | old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); | |
952ab431 JJ |
1158 | if (!old_symlink_name) { |
1159 | error = -ENOMEM; | |
1160 | goto out_free_old_class; | |
1161 | } | |
a2de48ca GKH |
1162 | strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE); |
1163 | } | |
1164 | ||
1165 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); | |
1166 | ||
1167 | error = kobject_rename(&dev->kobj, new_name); | |
1168 | ||
99ef3ef8 | 1169 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1170 | if (old_class_name) { |
1171 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1172 | if (new_class_name) { | |
1173 | sysfs_create_link(&dev->parent->kobj, &dev->kobj, | |
1174 | new_class_name); | |
1175 | sysfs_remove_link(&dev->parent->kobj, old_class_name); | |
1176 | } | |
1177 | } | |
99ef3ef8 KS |
1178 | #endif |
1179 | ||
a2de48ca | 1180 | if (dev->class) { |
823bccfc | 1181 | sysfs_remove_link(&dev->class->subsys.kobj, |
a2de48ca | 1182 | old_symlink_name); |
823bccfc | 1183 | sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
a2de48ca GKH |
1184 | dev->bus_id); |
1185 | } | |
1186 | put_device(dev); | |
1187 | ||
a2de48ca GKH |
1188 | kfree(new_class_name); |
1189 | kfree(old_symlink_name); | |
952ab431 JJ |
1190 | out_free_old_class: |
1191 | kfree(old_class_name); | |
a2de48ca GKH |
1192 | |
1193 | return error; | |
1194 | } | |
a2807dbc | 1195 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1196 | |
1197 | static int device_move_class_links(struct device *dev, | |
1198 | struct device *old_parent, | |
1199 | struct device *new_parent) | |
1200 | { | |
f7f3461d | 1201 | int error = 0; |
8a82472f | 1202 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1203 | char *class_name; |
1204 | ||
1205 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1206 | if (!class_name) { | |
cb360bbf | 1207 | error = -ENOMEM; |
8a82472f CH |
1208 | goto out; |
1209 | } | |
1210 | if (old_parent) { | |
1211 | sysfs_remove_link(&dev->kobj, "device"); | |
1212 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1213 | } | |
c744aeae CH |
1214 | if (new_parent) { |
1215 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1216 | "device"); | |
1217 | if (error) | |
1218 | goto out; | |
1219 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1220 | class_name); | |
1221 | if (error) | |
1222 | sysfs_remove_link(&dev->kobj, "device"); | |
1223 | } | |
1224 | else | |
1225 | error = 0; | |
8a82472f CH |
1226 | out: |
1227 | kfree(class_name); | |
1228 | return error; | |
1229 | #else | |
f7f3461d GKH |
1230 | if (old_parent) |
1231 | sysfs_remove_link(&dev->kobj, "device"); | |
1232 | if (new_parent) | |
1233 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1234 | "device"); | |
1235 | return error; | |
8a82472f CH |
1236 | #endif |
1237 | } | |
1238 | ||
1239 | /** | |
1240 | * device_move - moves a device to a new parent | |
1241 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1242 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1243 | */ |
1244 | int device_move(struct device *dev, struct device *new_parent) | |
1245 | { | |
1246 | int error; | |
1247 | struct device *old_parent; | |
c744aeae | 1248 | struct kobject *new_parent_kobj; |
8a82472f CH |
1249 | |
1250 | dev = get_device(dev); | |
1251 | if (!dev) | |
1252 | return -EINVAL; | |
1253 | ||
8a82472f | 1254 | new_parent = get_device(new_parent); |
c744aeae CH |
1255 | new_parent_kobj = get_device_parent (dev, new_parent); |
1256 | if (IS_ERR(new_parent_kobj)) { | |
1257 | error = PTR_ERR(new_parent_kobj); | |
1258 | put_device(new_parent); | |
8a82472f CH |
1259 | goto out; |
1260 | } | |
1261 | pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, | |
c744aeae CH |
1262 | new_parent ? new_parent->bus_id : "<NULL>"); |
1263 | error = kobject_move(&dev->kobj, new_parent_kobj); | |
8a82472f CH |
1264 | if (error) { |
1265 | put_device(new_parent); | |
1266 | goto out; | |
1267 | } | |
1268 | old_parent = dev->parent; | |
1269 | dev->parent = new_parent; | |
1270 | if (old_parent) | |
acf02d23 | 1271 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1272 | if (new_parent) |
1273 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1274 | if (!dev->class) |
1275 | goto out_put; | |
1276 | error = device_move_class_links(dev, old_parent, new_parent); | |
1277 | if (error) { | |
1278 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1279 | device_move_class_links(dev, new_parent, old_parent); | |
1280 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1281 | if (new_parent) |
1282 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1283 | if (old_parent) |
1284 | klist_add_tail(&dev->knode_parent, | |
1285 | &old_parent->klist_children); | |
1286 | } | |
1287 | put_device(new_parent); | |
1288 | goto out; | |
1289 | } | |
1290 | out_put: | |
1291 | put_device(old_parent); | |
1292 | out: | |
1293 | put_device(dev); | |
1294 | return error; | |
1295 | } | |
1296 | ||
1297 | EXPORT_SYMBOL_GPL(device_move); |