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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 : | |
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 | { | |
60a96a59 KS |
306 | size_t len = count; |
307 | enum kobject_action action; | |
308 | ||
309 | if (len && buf[len-1] == '\n') | |
310 | len--; | |
311 | ||
312 | for (action = 0; action < KOBJ_MAX; action++) { | |
313 | if (strncmp(kobject_actions[action], buf, len) != 0) | |
314 | continue; | |
315 | if (kobject_actions[action][len] != '\0') | |
316 | continue; | |
317 | kobject_uevent(&dev->kobj, action); | |
318 | goto out; | |
319 | } | |
320 | ||
321 | dev_err(dev, "uevent: unsupported action-string; this will " | |
322 | "be ignored in a future kernel version\n"); | |
312c004d | 323 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 324 | out: |
a7fd6706 KS |
325 | return count; |
326 | } | |
327 | ||
ad6a1e1c TH |
328 | static struct device_attribute uevent_attr = |
329 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
330 | ||
621a1672 DT |
331 | static int device_add_attributes(struct device *dev, |
332 | struct device_attribute *attrs) | |
de0ff00d | 333 | { |
621a1672 | 334 | int error = 0; |
de0ff00d | 335 | int i; |
621a1672 DT |
336 | |
337 | if (attrs) { | |
338 | for (i = 0; attr_name(attrs[i]); i++) { | |
339 | error = device_create_file(dev, &attrs[i]); | |
340 | if (error) | |
341 | break; | |
342 | } | |
343 | if (error) | |
344 | while (--i >= 0) | |
345 | device_remove_file(dev, &attrs[i]); | |
346 | } | |
347 | return error; | |
348 | } | |
349 | ||
350 | static void device_remove_attributes(struct device *dev, | |
351 | struct device_attribute *attrs) | |
352 | { | |
353 | int i; | |
354 | ||
355 | if (attrs) | |
356 | for (i = 0; attr_name(attrs[i]); i++) | |
357 | device_remove_file(dev, &attrs[i]); | |
358 | } | |
359 | ||
360 | static int device_add_groups(struct device *dev, | |
361 | struct attribute_group **groups) | |
362 | { | |
de0ff00d | 363 | int error = 0; |
621a1672 | 364 | int i; |
de0ff00d | 365 | |
621a1672 DT |
366 | if (groups) { |
367 | for (i = 0; groups[i]; i++) { | |
368 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
369 | if (error) { |
370 | while (--i >= 0) | |
621a1672 DT |
371 | sysfs_remove_group(&dev->kobj, groups[i]); |
372 | break; | |
de0ff00d GKH |
373 | } |
374 | } | |
375 | } | |
de0ff00d GKH |
376 | return error; |
377 | } | |
378 | ||
621a1672 DT |
379 | static void device_remove_groups(struct device *dev, |
380 | struct attribute_group **groups) | |
de0ff00d GKH |
381 | { |
382 | int i; | |
621a1672 DT |
383 | |
384 | if (groups) | |
385 | for (i = 0; groups[i]; i++) | |
386 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
387 | } |
388 | ||
2620efef GKH |
389 | static int device_add_attrs(struct device *dev) |
390 | { | |
391 | struct class *class = dev->class; | |
f9f852df | 392 | struct device_type *type = dev->type; |
621a1672 | 393 | int error; |
2620efef | 394 | |
621a1672 DT |
395 | if (class) { |
396 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 397 | if (error) |
621a1672 | 398 | return error; |
2620efef | 399 | } |
f9f852df | 400 | |
621a1672 DT |
401 | if (type) { |
402 | error = device_add_groups(dev, type->groups); | |
f9f852df | 403 | if (error) |
621a1672 | 404 | goto err_remove_class_attrs; |
f9f852df KS |
405 | } |
406 | ||
621a1672 DT |
407 | error = device_add_groups(dev, dev->groups); |
408 | if (error) | |
409 | goto err_remove_type_groups; | |
410 | ||
411 | return 0; | |
412 | ||
413 | err_remove_type_groups: | |
414 | if (type) | |
415 | device_remove_groups(dev, type->groups); | |
416 | err_remove_class_attrs: | |
417 | if (class) | |
418 | device_remove_attributes(dev, class->dev_attrs); | |
419 | ||
2620efef GKH |
420 | return error; |
421 | } | |
422 | ||
423 | static void device_remove_attrs(struct device *dev) | |
424 | { | |
425 | struct class *class = dev->class; | |
f9f852df | 426 | struct device_type *type = dev->type; |
2620efef | 427 | |
621a1672 | 428 | device_remove_groups(dev, dev->groups); |
f9f852df | 429 | |
621a1672 DT |
430 | if (type) |
431 | device_remove_groups(dev, type->groups); | |
432 | ||
433 | if (class) | |
434 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
435 | } |
436 | ||
437 | ||
23681e47 GKH |
438 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
439 | char *buf) | |
440 | { | |
441 | return print_dev_t(buf, dev->devt); | |
442 | } | |
443 | ||
ad6a1e1c TH |
444 | static struct device_attribute devt_attr = |
445 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
446 | ||
0863afb3 MW |
447 | /* |
448 | * devices_subsys - structure to be registered with kobject core. | |
1da177e4 LT |
449 | */ |
450 | ||
312c004d | 451 | decl_subsys(devices, &ktype_device, &device_uevent_ops); |
1da177e4 LT |
452 | |
453 | ||
454 | /** | |
455 | * device_create_file - create sysfs attribute file for device. | |
456 | * @dev: device. | |
457 | * @attr: device attribute descriptor. | |
458 | */ | |
459 | ||
460 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
461 | { | |
462 | int error = 0; | |
463 | if (get_device(dev)) { | |
464 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
465 | put_device(dev); | |
466 | } | |
467 | return error; | |
468 | } | |
469 | ||
470 | /** | |
471 | * device_remove_file - remove sysfs attribute file. | |
472 | * @dev: device. | |
473 | * @attr: device attribute descriptor. | |
474 | */ | |
475 | ||
476 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
477 | { | |
478 | if (get_device(dev)) { | |
479 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
480 | put_device(dev); | |
481 | } | |
482 | } | |
483 | ||
2589f188 GKH |
484 | /** |
485 | * device_create_bin_file - create sysfs binary attribute file for device. | |
486 | * @dev: device. | |
487 | * @attr: device binary attribute descriptor. | |
488 | */ | |
489 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
490 | { | |
491 | int error = -EINVAL; | |
492 | if (dev) | |
493 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
494 | return error; | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
497 | ||
498 | /** | |
499 | * device_remove_bin_file - remove sysfs binary attribute file | |
500 | * @dev: device. | |
501 | * @attr: device binary attribute descriptor. | |
502 | */ | |
503 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
504 | { | |
505 | if (dev) | |
506 | sysfs_remove_bin_file(&dev->kobj, attr); | |
507 | } | |
508 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
509 | ||
d9a9cdfb | 510 | /** |
523ded71 | 511 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
512 | * @dev: device. |
513 | * @func: callback function to invoke later. | |
523ded71 | 514 | * @owner: module owning the callback routine |
d9a9cdfb AS |
515 | * |
516 | * Attribute methods must not unregister themselves or their parent device | |
517 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
518 | * since unregistration is mutually exclusive with driver callbacks. | |
519 | * | |
520 | * Instead methods can call this routine, which will attempt to allocate | |
521 | * and schedule a workqueue request to call back @func with @dev as its | |
522 | * argument in the workqueue's process context. @dev will be pinned until | |
523 | * @func returns. | |
524 | * | |
523ded71 AS |
525 | * This routine is usually called via the inline device_schedule_callback(), |
526 | * which automatically sets @owner to THIS_MODULE. | |
527 | * | |
d9a9cdfb | 528 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 529 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
530 | * |
531 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
532 | * underlying sysfs routine (since it is intended for use by attribute | |
533 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
534 | */ | |
523ded71 AS |
535 | int device_schedule_callback_owner(struct device *dev, |
536 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
537 | { |
538 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 539 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 540 | } |
523ded71 | 541 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 542 | |
34bb61f9 JB |
543 | static void klist_children_get(struct klist_node *n) |
544 | { | |
545 | struct device *dev = container_of(n, struct device, knode_parent); | |
546 | ||
547 | get_device(dev); | |
548 | } | |
549 | ||
550 | static void klist_children_put(struct klist_node *n) | |
551 | { | |
552 | struct device *dev = container_of(n, struct device, knode_parent); | |
553 | ||
554 | put_device(dev); | |
555 | } | |
556 | ||
1da177e4 LT |
557 | |
558 | /** | |
559 | * device_initialize - init device structure. | |
560 | * @dev: device. | |
561 | * | |
562 | * This prepares the device for use by other layers, | |
563 | * including adding it to the device hierarchy. | |
564 | * It is the first half of device_register(), if called by | |
565 | * that, though it can also be called separately, so one | |
566 | * may use @dev's fields (e.g. the refcount). | |
567 | */ | |
568 | ||
569 | void device_initialize(struct device *dev) | |
570 | { | |
571 | kobj_set_kset_s(dev, devices_subsys); | |
572 | kobject_init(&dev->kobj); | |
34bb61f9 JB |
573 | klist_init(&dev->klist_children, klist_children_get, |
574 | klist_children_put); | |
1da177e4 | 575 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 576 | INIT_LIST_HEAD(&dev->node); |
af70316a | 577 | init_MUTEX(&dev->sem); |
9ac7849e TH |
578 | spin_lock_init(&dev->devres_lock); |
579 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 580 | device_init_wakeup(dev, 0); |
87348136 | 581 | set_dev_node(dev, -1); |
1da177e4 LT |
582 | } |
583 | ||
40fa5422 | 584 | #ifdef CONFIG_SYSFS_DEPRECATED |
c744aeae CH |
585 | static struct kobject * get_device_parent(struct device *dev, |
586 | struct device *parent) | |
40fa5422 GKH |
587 | { |
588 | /* Set the parent to the class, not the parent device */ | |
589 | /* this keeps sysfs from having a symlink to make old udevs happy */ | |
590 | if (dev->class) | |
823bccfc | 591 | return &dev->class->subsys.kobj; |
40fa5422 | 592 | else if (parent) |
c744aeae | 593 | return &parent->kobj; |
40fa5422 | 594 | |
c744aeae | 595 | return NULL; |
40fa5422 GKH |
596 | } |
597 | #else | |
86406245 | 598 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 599 | { |
86406245 | 600 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 601 | |
86406245 | 602 | if (!virtual_dir) |
823bccfc | 603 | virtual_dir = kobject_add_dir(&devices_subsys.kobj, "virtual"); |
f0ee61a6 | 604 | |
86406245 | 605 | return virtual_dir; |
f0ee61a6 GKH |
606 | } |
607 | ||
c744aeae CH |
608 | static struct kobject * get_device_parent(struct device *dev, |
609 | struct device *parent) | |
40fa5422 | 610 | { |
86406245 KS |
611 | if (dev->class) { |
612 | struct kobject *kobj = NULL; | |
613 | struct kobject *parent_kobj; | |
614 | struct kobject *k; | |
615 | ||
616 | /* | |
617 | * If we have no parent, we live in "virtual". | |
618 | * Class-devices with a bus-device as parent, live | |
619 | * in a class-directory to prevent namespace collisions. | |
620 | */ | |
621 | if (parent == NULL) | |
622 | parent_kobj = virtual_device_parent(dev); | |
623 | else if (parent->class) | |
624 | return &parent->kobj; | |
625 | else | |
626 | parent_kobj = &parent->kobj; | |
627 | ||
628 | /* find our class-directory at the parent and reference it */ | |
629 | spin_lock(&dev->class->class_dirs.list_lock); | |
630 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
631 | if (k->parent == parent_kobj) { | |
632 | kobj = kobject_get(k); | |
633 | break; | |
634 | } | |
635 | spin_unlock(&dev->class->class_dirs.list_lock); | |
636 | if (kobj) | |
637 | return kobj; | |
638 | ||
639 | /* or create a new class-directory at the parent device */ | |
640 | return kobject_kset_add_dir(&dev->class->class_dirs, | |
641 | parent_kobj, dev->class->name); | |
642 | } | |
643 | ||
644 | if (parent) | |
c744aeae CH |
645 | return &parent->kobj; |
646 | return NULL; | |
647 | } | |
c744aeae | 648 | #endif |
86406245 | 649 | |
c744aeae CH |
650 | static int setup_parent(struct device *dev, struct device *parent) |
651 | { | |
652 | struct kobject *kobj; | |
653 | kobj = get_device_parent(dev, parent); | |
654 | if (IS_ERR(kobj)) | |
655 | return PTR_ERR(kobj); | |
656 | if (kobj) | |
657 | dev->kobj.parent = kobj; | |
40fa5422 GKH |
658 | return 0; |
659 | } | |
40fa5422 | 660 | |
2ee97caf CH |
661 | static int device_add_class_symlinks(struct device *dev) |
662 | { | |
663 | int error; | |
664 | ||
665 | if (!dev->class) | |
666 | return 0; | |
667 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, | |
668 | "subsystem"); | |
669 | if (error) | |
670 | goto out; | |
671 | /* | |
672 | * If this is not a "fake" compatible device, then create the | |
673 | * symlink from the class to the device. | |
674 | */ | |
675 | if (dev->kobj.parent != &dev->class->subsys.kobj) { | |
676 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
677 | dev->bus_id); | |
678 | if (error) | |
679 | goto out_subsys; | |
680 | } | |
27907689 | 681 | if (dev->parent) { |
2ee97caf CH |
682 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
683 | "device"); | |
684 | if (error) | |
685 | goto out_busid; | |
686 | #ifdef CONFIG_SYSFS_DEPRECATED | |
687 | { | |
688 | char * class_name = make_class_name(dev->class->name, | |
689 | &dev->kobj); | |
690 | if (class_name) | |
691 | error = sysfs_create_link(&dev->parent->kobj, | |
692 | &dev->kobj, class_name); | |
693 | kfree(class_name); | |
694 | if (error) | |
695 | goto out_device; | |
696 | } | |
697 | #endif | |
698 | } | |
699 | return 0; | |
700 | ||
701 | #ifdef CONFIG_SYSFS_DEPRECATED | |
702 | out_device: | |
703 | if (dev->parent) | |
704 | sysfs_remove_link(&dev->kobj, "device"); | |
705 | #endif | |
706 | out_busid: | |
707 | if (dev->kobj.parent != &dev->class->subsys.kobj) | |
708 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
709 | out_subsys: | |
710 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
711 | out: | |
712 | return error; | |
713 | } | |
714 | ||
715 | static void device_remove_class_symlinks(struct device *dev) | |
716 | { | |
717 | if (!dev->class) | |
718 | return; | |
719 | if (dev->parent) { | |
720 | #ifdef CONFIG_SYSFS_DEPRECATED | |
721 | char *class_name; | |
722 | ||
723 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
724 | if (class_name) { | |
725 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
726 | kfree(class_name); | |
727 | } | |
728 | #endif | |
729 | sysfs_remove_link(&dev->kobj, "device"); | |
730 | } | |
731 | if (dev->kobj.parent != &dev->class->subsys.kobj) | |
732 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
733 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
734 | } | |
735 | ||
1da177e4 LT |
736 | /** |
737 | * device_add - add device to device hierarchy. | |
738 | * @dev: device. | |
739 | * | |
740 | * This is part 2 of device_register(), though may be called | |
741 | * separately _iff_ device_initialize() has been called separately. | |
742 | * | |
743 | * This adds it to the kobject hierarchy via kobject_add(), adds it | |
744 | * to the global and sibling lists for the device, then | |
745 | * adds it to the other relevant subsystems of the driver model. | |
746 | */ | |
747 | int device_add(struct device *dev) | |
748 | { | |
749 | struct device *parent = NULL; | |
c47ed219 | 750 | struct class_interface *class_intf; |
1da177e4 LT |
751 | int error = -EINVAL; |
752 | ||
753 | dev = get_device(dev); | |
754 | if (!dev || !strlen(dev->bus_id)) | |
755 | goto Error; | |
756 | ||
40fa5422 | 757 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); |
c205ef48 | 758 | |
1da177e4 | 759 | parent = get_device(dev->parent); |
40fa5422 GKH |
760 | error = setup_parent(dev, parent); |
761 | if (error) | |
762 | goto Error; | |
1da177e4 LT |
763 | |
764 | /* first, register with generic layer. */ | |
765 | kobject_set_name(&dev->kobj, "%s", dev->bus_id); | |
40fa5422 GKH |
766 | error = kobject_add(&dev->kobj); |
767 | if (error) | |
1da177e4 | 768 | goto Error; |
a7fd6706 | 769 | |
37022644 BW |
770 | /* notify platform of device entry */ |
771 | if (platform_notify) | |
772 | platform_notify(dev); | |
773 | ||
116af378 BH |
774 | /* notify clients of device entry (new way) */ |
775 | if (dev->bus) | |
776 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
777 | BUS_NOTIFY_ADD_DEVICE, dev); | |
778 | ||
ad6a1e1c | 779 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
780 | if (error) |
781 | goto attrError; | |
a7fd6706 | 782 | |
23681e47 | 783 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
784 | error = device_create_file(dev, &devt_attr); |
785 | if (error) | |
a306eea4 | 786 | goto ueventattrError; |
23681e47 GKH |
787 | } |
788 | ||
2ee97caf CH |
789 | error = device_add_class_symlinks(dev); |
790 | if (error) | |
791 | goto SymlinkError; | |
dc0afa83 CH |
792 | error = device_add_attrs(dev); |
793 | if (error) | |
2620efef | 794 | goto AttrsError; |
dc0afa83 CH |
795 | error = device_pm_add(dev); |
796 | if (error) | |
1da177e4 | 797 | goto PMError; |
dc0afa83 CH |
798 | error = bus_add_device(dev); |
799 | if (error) | |
1da177e4 | 800 | goto BusError; |
83b5fb4c | 801 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 802 | bus_attach_device(dev); |
1da177e4 | 803 | if (parent) |
d856f1e3 | 804 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 805 | |
5d9fd169 | 806 | if (dev->class) { |
5d9fd169 | 807 | down(&dev->class->sem); |
c47ed219 | 808 | /* tie the class to the device */ |
5d9fd169 | 809 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
810 | |
811 | /* notify any interfaces that the device is here */ | |
812 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
813 | if (class_intf->add_dev) | |
814 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
815 | up(&dev->class->sem); |
816 | } | |
1da177e4 LT |
817 | Done: |
818 | put_device(dev); | |
819 | return error; | |
820 | BusError: | |
821 | device_pm_remove(dev); | |
822 | PMError: | |
116af378 BH |
823 | if (dev->bus) |
824 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
825 | BUS_NOTIFY_DEL_DEVICE, dev); | |
82f0cf9b | 826 | device_remove_attrs(dev); |
2620efef | 827 | AttrsError: |
2ee97caf CH |
828 | device_remove_class_symlinks(dev); |
829 | SymlinkError: | |
ad6a1e1c TH |
830 | if (MAJOR(dev->devt)) |
831 | device_remove_file(dev, &devt_attr); | |
82f0cf9b JS |
832 | |
833 | if (dev->class) { | |
834 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
835 | /* If this is not a "fake" compatible device, remove the | |
836 | * symlink from the class to the device. */ | |
823bccfc GKH |
837 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
838 | sysfs_remove_link(&dev->class->subsys.kobj, | |
82f0cf9b | 839 | dev->bus_id); |
82f0cf9b | 840 | if (parent) { |
f7f3461d | 841 | #ifdef CONFIG_SYSFS_DEPRECATED |
82f0cf9b JS |
842 | char *class_name = make_class_name(dev->class->name, |
843 | &dev->kobj); | |
844 | if (class_name) | |
845 | sysfs_remove_link(&dev->parent->kobj, | |
846 | class_name); | |
847 | kfree(class_name); | |
f7f3461d | 848 | #endif |
82f0cf9b JS |
849 | sysfs_remove_link(&dev->kobj, "device"); |
850 | } | |
82f0cf9b | 851 | } |
a306eea4 | 852 | ueventattrError: |
ad6a1e1c | 853 | device_remove_file(dev, &uevent_attr); |
23681e47 | 854 | attrError: |
312c004d | 855 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
856 | kobject_del(&dev->kobj); |
857 | Error: | |
858 | if (parent) | |
859 | put_device(parent); | |
860 | goto Done; | |
861 | } | |
862 | ||
863 | ||
864 | /** | |
865 | * device_register - register a device with the system. | |
866 | * @dev: pointer to the device structure | |
867 | * | |
868 | * This happens in two clean steps - initialize the device | |
869 | * and add it to the system. The two steps can be called | |
870 | * separately, but this is the easiest and most common. | |
871 | * I.e. you should only call the two helpers separately if | |
872 | * have a clearly defined need to use and refcount the device | |
873 | * before it is added to the hierarchy. | |
874 | */ | |
875 | ||
876 | int device_register(struct device *dev) | |
877 | { | |
878 | device_initialize(dev); | |
879 | return device_add(dev); | |
880 | } | |
881 | ||
882 | ||
883 | /** | |
884 | * get_device - increment reference count for device. | |
885 | * @dev: device. | |
886 | * | |
887 | * This simply forwards the call to kobject_get(), though | |
888 | * we do take care to provide for the case that we get a NULL | |
889 | * pointer passed in. | |
890 | */ | |
891 | ||
892 | struct device * get_device(struct device * dev) | |
893 | { | |
894 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
895 | } | |
896 | ||
897 | ||
898 | /** | |
899 | * put_device - decrement reference count. | |
900 | * @dev: device in question. | |
901 | */ | |
902 | void put_device(struct device * dev) | |
903 | { | |
904 | if (dev) | |
905 | kobject_put(&dev->kobj); | |
906 | } | |
907 | ||
908 | ||
909 | /** | |
910 | * device_del - delete device from system. | |
911 | * @dev: device. | |
912 | * | |
913 | * This is the first part of the device unregistration | |
914 | * sequence. This removes the device from the lists we control | |
915 | * from here, has it removed from the other driver model | |
916 | * subsystems it was added to in device_add(), and removes it | |
917 | * from the kobject hierarchy. | |
918 | * | |
919 | * NOTE: this should be called manually _iff_ device_add() was | |
920 | * also called manually. | |
921 | */ | |
922 | ||
923 | void device_del(struct device * dev) | |
924 | { | |
925 | struct device * parent = dev->parent; | |
c47ed219 | 926 | struct class_interface *class_intf; |
1da177e4 | 927 | |
1da177e4 | 928 | if (parent) |
d62c0f9f | 929 | klist_del(&dev->knode_parent); |
ad6a1e1c TH |
930 | if (MAJOR(dev->devt)) |
931 | device_remove_file(dev, &devt_attr); | |
b9d9c82b KS |
932 | if (dev->class) { |
933 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
40fa5422 GKH |
934 | /* If this is not a "fake" compatible device, remove the |
935 | * symlink from the class to the device. */ | |
823bccfc GKH |
936 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
937 | sysfs_remove_link(&dev->class->subsys.kobj, | |
40fa5422 | 938 | dev->bus_id); |
64bb5d2c | 939 | if (parent) { |
f7f3461d | 940 | #ifdef CONFIG_SYSFS_DEPRECATED |
99ef3ef8 KS |
941 | char *class_name = make_class_name(dev->class->name, |
942 | &dev->kobj); | |
cb360bbf CH |
943 | if (class_name) |
944 | sysfs_remove_link(&dev->parent->kobj, | |
945 | class_name); | |
99ef3ef8 | 946 | kfree(class_name); |
f7f3461d | 947 | #endif |
99ef3ef8 | 948 | sysfs_remove_link(&dev->kobj, "device"); |
64bb5d2c | 949 | } |
99ef3ef8 | 950 | |
5d9fd169 | 951 | down(&dev->class->sem); |
c47ed219 GKH |
952 | /* notify any interfaces that the device is now gone */ |
953 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
954 | if (class_intf->remove_dev) | |
955 | class_intf->remove_dev(dev, class_intf); | |
956 | /* remove the device from the class list */ | |
5d9fd169 GKH |
957 | list_del_init(&dev->node); |
958 | up(&dev->class->sem); | |
86406245 KS |
959 | |
960 | /* If we live in a parent class-directory, unreference it */ | |
961 | if (dev->kobj.parent->kset == &dev->class->class_dirs) { | |
962 | struct device *d; | |
963 | int other = 0; | |
964 | ||
965 | /* | |
966 | * if we are the last child of our class, delete | |
967 | * our class-directory at this parent | |
968 | */ | |
969 | down(&dev->class->sem); | |
970 | list_for_each_entry(d, &dev->class->devices, node) { | |
971 | if (d == dev) | |
972 | continue; | |
973 | if (d->kobj.parent == dev->kobj.parent) { | |
974 | other = 1; | |
975 | break; | |
976 | } | |
977 | } | |
978 | if (!other) | |
979 | kobject_del(dev->kobj.parent); | |
980 | ||
981 | kobject_put(dev->kobj.parent); | |
982 | up(&dev->class->sem); | |
983 | } | |
b9d9c82b | 984 | } |
ad6a1e1c | 985 | device_remove_file(dev, &uevent_attr); |
2620efef | 986 | device_remove_attrs(dev); |
28953533 | 987 | bus_remove_device(dev); |
1da177e4 | 988 | |
2f8d16a9 TH |
989 | /* |
990 | * Some platform devices are driven without driver attached | |
991 | * and managed resources may have been acquired. Make sure | |
992 | * all resources are released. | |
993 | */ | |
994 | devres_release_all(dev); | |
995 | ||
1da177e4 LT |
996 | /* Notify the platform of the removal, in case they |
997 | * need to do anything... | |
998 | */ | |
999 | if (platform_notify_remove) | |
1000 | platform_notify_remove(dev); | |
116af378 BH |
1001 | if (dev->bus) |
1002 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
1003 | BUS_NOTIFY_DEL_DEVICE, dev); | |
1da177e4 | 1004 | device_pm_remove(dev); |
312c004d | 1005 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
1006 | kobject_del(&dev->kobj); |
1007 | if (parent) | |
1008 | put_device(parent); | |
1009 | } | |
1010 | ||
1011 | /** | |
1012 | * device_unregister - unregister device from system. | |
1013 | * @dev: device going away. | |
1014 | * | |
1015 | * We do this in two parts, like we do device_register(). First, | |
1016 | * we remove it from all the subsystems with device_del(), then | |
1017 | * we decrement the reference count via put_device(). If that | |
1018 | * is the final reference count, the device will be cleaned up | |
1019 | * via device_release() above. Otherwise, the structure will | |
1020 | * stick around until the final reference to the device is dropped. | |
1021 | */ | |
1022 | void device_unregister(struct device * dev) | |
1023 | { | |
1024 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); | |
1025 | device_del(dev); | |
1026 | put_device(dev); | |
1027 | } | |
1028 | ||
1029 | ||
36239577 PM |
1030 | static struct device * next_device(struct klist_iter * i) |
1031 | { | |
1032 | struct klist_node * n = klist_next(i); | |
1033 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
1034 | } | |
1035 | ||
1da177e4 LT |
1036 | /** |
1037 | * device_for_each_child - device child iterator. | |
c41455fb | 1038 | * @parent: parent struct device. |
1da177e4 LT |
1039 | * @data: data for the callback. |
1040 | * @fn: function to be called for each device. | |
1041 | * | |
c41455fb | 1042 | * Iterate over @parent's child devices, and call @fn for each, |
1da177e4 LT |
1043 | * passing it @data. |
1044 | * | |
1045 | * We check the return of @fn each time. If it returns anything | |
1046 | * other than 0, we break out and return that value. | |
1047 | */ | |
36239577 | 1048 | int device_for_each_child(struct device * parent, void * data, |
1da177e4 LT |
1049 | int (*fn)(struct device *, void *)) |
1050 | { | |
36239577 | 1051 | struct klist_iter i; |
1da177e4 LT |
1052 | struct device * child; |
1053 | int error = 0; | |
1054 | ||
36239577 PM |
1055 | klist_iter_init(&parent->klist_children, &i); |
1056 | while ((child = next_device(&i)) && !error) | |
1057 | error = fn(child, data); | |
1058 | klist_iter_exit(&i); | |
1da177e4 LT |
1059 | return error; |
1060 | } | |
1061 | ||
5ab69981 CH |
1062 | /** |
1063 | * device_find_child - device iterator for locating a particular device. | |
1064 | * @parent: parent struct device | |
1065 | * @data: Data to pass to match function | |
1066 | * @match: Callback function to check device | |
1067 | * | |
1068 | * This is similar to the device_for_each_child() function above, but it | |
1069 | * returns a reference to a device that is 'found' for later use, as | |
1070 | * determined by the @match callback. | |
1071 | * | |
1072 | * The callback should return 0 if the device doesn't match and non-zero | |
1073 | * if it does. If the callback returns non-zero and a reference to the | |
1074 | * current device can be obtained, this function will return to the caller | |
1075 | * and not iterate over any more devices. | |
1076 | */ | |
1077 | struct device * device_find_child(struct device *parent, void *data, | |
1078 | int (*match)(struct device *, void *)) | |
1079 | { | |
1080 | struct klist_iter i; | |
1081 | struct device *child; | |
1082 | ||
1083 | if (!parent) | |
1084 | return NULL; | |
1085 | ||
1086 | klist_iter_init(&parent->klist_children, &i); | |
1087 | while ((child = next_device(&i))) | |
1088 | if (match(child, data) && get_device(child)) | |
1089 | break; | |
1090 | klist_iter_exit(&i); | |
1091 | return child; | |
1092 | } | |
1093 | ||
1da177e4 LT |
1094 | int __init devices_init(void) |
1095 | { | |
1096 | return subsystem_register(&devices_subsys); | |
1097 | } | |
1098 | ||
1099 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1100 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1101 | |
1102 | EXPORT_SYMBOL_GPL(device_initialize); | |
1103 | EXPORT_SYMBOL_GPL(device_add); | |
1104 | EXPORT_SYMBOL_GPL(device_register); | |
1105 | ||
1106 | EXPORT_SYMBOL_GPL(device_del); | |
1107 | EXPORT_SYMBOL_GPL(device_unregister); | |
1108 | EXPORT_SYMBOL_GPL(get_device); | |
1109 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1110 | |
1111 | EXPORT_SYMBOL_GPL(device_create_file); | |
1112 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1113 | |
1114 | ||
1115 | static void device_create_release(struct device *dev) | |
1116 | { | |
1117 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); | |
1118 | kfree(dev); | |
1119 | } | |
1120 | ||
1121 | /** | |
1122 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1123 | * @class: pointer to the struct class that this device should be registered to |
1124 | * @parent: pointer to the parent struct device of this new device, if any | |
1125 | * @devt: the dev_t for the char device to be added | |
1126 | * @fmt: string for the device's name | |
1127 | * | |
1128 | * This function can be used by char device classes. A struct device | |
1129 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1130 | * |
23681e47 GKH |
1131 | * A "dev" file will be created, showing the dev_t for the device, if |
1132 | * the dev_t is not 0,0. | |
42734daf HK |
1133 | * If a pointer to a parent struct device is passed in, the newly created |
1134 | * struct device will be a child of that device in sysfs. | |
1135 | * The pointer to the struct device will be returned from the call. | |
1136 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1137 | * pointer. |
1138 | * | |
1139 | * Note: the struct class passed to this function must have previously | |
1140 | * been created with a call to class_create(). | |
1141 | */ | |
1142 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1143 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1144 | { |
1145 | va_list args; | |
1146 | struct device *dev = NULL; | |
1147 | int retval = -ENODEV; | |
1148 | ||
1149 | if (class == NULL || IS_ERR(class)) | |
1150 | goto error; | |
23681e47 GKH |
1151 | |
1152 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1153 | if (!dev) { | |
1154 | retval = -ENOMEM; | |
1155 | goto error; | |
1156 | } | |
1157 | ||
1158 | dev->devt = devt; | |
1159 | dev->class = class; | |
1160 | dev->parent = parent; | |
1161 | dev->release = device_create_release; | |
1162 | ||
1163 | va_start(args, fmt); | |
1164 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1165 | va_end(args); | |
1166 | retval = device_register(dev); | |
1167 | if (retval) | |
1168 | goto error; | |
1169 | ||
23681e47 GKH |
1170 | return dev; |
1171 | ||
1172 | error: | |
1173 | kfree(dev); | |
1174 | return ERR_PTR(retval); | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(device_create); | |
1177 | ||
1178 | /** | |
1179 | * device_destroy - removes a device that was created with device_create() | |
42734daf HK |
1180 | * @class: pointer to the struct class that this device was registered with |
1181 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 1182 | * |
42734daf HK |
1183 | * This call unregisters and cleans up a device that was created with a |
1184 | * call to device_create(). | |
23681e47 GKH |
1185 | */ |
1186 | void device_destroy(struct class *class, dev_t devt) | |
1187 | { | |
1188 | struct device *dev = NULL; | |
1189 | struct device *dev_tmp; | |
1190 | ||
1191 | down(&class->sem); | |
1192 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1193 | if (dev_tmp->devt == devt) { | |
1194 | dev = dev_tmp; | |
1195 | break; | |
1196 | } | |
1197 | } | |
1198 | up(&class->sem); | |
1199 | ||
5d9fd169 | 1200 | if (dev) |
23681e47 | 1201 | device_unregister(dev); |
23681e47 GKH |
1202 | } |
1203 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1204 | |
1205 | /** | |
1206 | * device_rename - renames a device | |
1207 | * @dev: the pointer to the struct device to be renamed | |
1208 | * @new_name: the new name of the device | |
1209 | */ | |
1210 | int device_rename(struct device *dev, char *new_name) | |
1211 | { | |
1212 | char *old_class_name = NULL; | |
1213 | char *new_class_name = NULL; | |
2ee97caf | 1214 | char *old_device_name = NULL; |
a2de48ca GKH |
1215 | int error; |
1216 | ||
1217 | dev = get_device(dev); | |
1218 | if (!dev) | |
1219 | return -EINVAL; | |
1220 | ||
1221 | pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); | |
1222 | ||
99ef3ef8 | 1223 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1224 | if ((dev->class) && (dev->parent)) |
1225 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1226 | #endif |
a2de48ca | 1227 | |
2ee97caf CH |
1228 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1229 | if (!old_device_name) { | |
1230 | error = -ENOMEM; | |
1231 | goto out; | |
a2de48ca | 1232 | } |
2ee97caf | 1233 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1234 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1235 | ||
1236 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1237 | if (error) { |
1238 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1239 | goto out; | |
1240 | } | |
a2de48ca | 1241 | |
99ef3ef8 | 1242 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1243 | if (old_class_name) { |
1244 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1245 | if (new_class_name) { | |
2ee97caf CH |
1246 | error = sysfs_create_link(&dev->parent->kobj, |
1247 | &dev->kobj, new_class_name); | |
1248 | if (error) | |
1249 | goto out; | |
a2de48ca GKH |
1250 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1251 | } | |
1252 | } | |
99ef3ef8 KS |
1253 | #endif |
1254 | ||
a2de48ca | 1255 | if (dev->class) { |
2ee97caf CH |
1256 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
1257 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
1258 | dev->bus_id); | |
1259 | if (error) { | |
1260 | /* Uh... how to unravel this if restoring can fail? */ | |
1261 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", | |
1262 | __FUNCTION__, error); | |
1263 | } | |
a2de48ca | 1264 | } |
2ee97caf | 1265 | out: |
a2de48ca GKH |
1266 | put_device(dev); |
1267 | ||
a2de48ca | 1268 | kfree(new_class_name); |
952ab431 | 1269 | kfree(old_class_name); |
2ee97caf | 1270 | kfree(old_device_name); |
a2de48ca GKH |
1271 | |
1272 | return error; | |
1273 | } | |
a2807dbc | 1274 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1275 | |
1276 | static int device_move_class_links(struct device *dev, | |
1277 | struct device *old_parent, | |
1278 | struct device *new_parent) | |
1279 | { | |
f7f3461d | 1280 | int error = 0; |
8a82472f | 1281 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1282 | char *class_name; |
1283 | ||
1284 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1285 | if (!class_name) { | |
cb360bbf | 1286 | error = -ENOMEM; |
8a82472f CH |
1287 | goto out; |
1288 | } | |
1289 | if (old_parent) { | |
1290 | sysfs_remove_link(&dev->kobj, "device"); | |
1291 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1292 | } | |
c744aeae CH |
1293 | if (new_parent) { |
1294 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1295 | "device"); | |
1296 | if (error) | |
1297 | goto out; | |
1298 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1299 | class_name); | |
1300 | if (error) | |
1301 | sysfs_remove_link(&dev->kobj, "device"); | |
1302 | } | |
1303 | else | |
1304 | error = 0; | |
8a82472f CH |
1305 | out: |
1306 | kfree(class_name); | |
1307 | return error; | |
1308 | #else | |
f7f3461d GKH |
1309 | if (old_parent) |
1310 | sysfs_remove_link(&dev->kobj, "device"); | |
1311 | if (new_parent) | |
1312 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1313 | "device"); | |
1314 | return error; | |
8a82472f CH |
1315 | #endif |
1316 | } | |
1317 | ||
1318 | /** | |
1319 | * device_move - moves a device to a new parent | |
1320 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1321 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1322 | */ |
1323 | int device_move(struct device *dev, struct device *new_parent) | |
1324 | { | |
1325 | int error; | |
1326 | struct device *old_parent; | |
c744aeae | 1327 | struct kobject *new_parent_kobj; |
8a82472f CH |
1328 | |
1329 | dev = get_device(dev); | |
1330 | if (!dev) | |
1331 | return -EINVAL; | |
1332 | ||
8a82472f | 1333 | new_parent = get_device(new_parent); |
c744aeae CH |
1334 | new_parent_kobj = get_device_parent (dev, new_parent); |
1335 | if (IS_ERR(new_parent_kobj)) { | |
1336 | error = PTR_ERR(new_parent_kobj); | |
1337 | put_device(new_parent); | |
8a82472f CH |
1338 | goto out; |
1339 | } | |
1340 | pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, | |
c744aeae CH |
1341 | new_parent ? new_parent->bus_id : "<NULL>"); |
1342 | error = kobject_move(&dev->kobj, new_parent_kobj); | |
8a82472f CH |
1343 | if (error) { |
1344 | put_device(new_parent); | |
1345 | goto out; | |
1346 | } | |
1347 | old_parent = dev->parent; | |
1348 | dev->parent = new_parent; | |
1349 | if (old_parent) | |
acf02d23 | 1350 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1351 | if (new_parent) |
1352 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1353 | if (!dev->class) |
1354 | goto out_put; | |
1355 | error = device_move_class_links(dev, old_parent, new_parent); | |
1356 | if (error) { | |
1357 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1358 | device_move_class_links(dev, new_parent, old_parent); | |
1359 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1360 | if (new_parent) |
1361 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1362 | if (old_parent) |
1363 | klist_add_tail(&dev->knode_parent, | |
1364 | &old_parent->klist_children); | |
1365 | } | |
1366 | put_device(new_parent); | |
1367 | goto out; | |
1368 | } | |
1369 | out_put: | |
1370 | put_device(old_parent); | |
1371 | out: | |
1372 | put_device(dev); | |
1373 | return error; | |
1374 | } | |
1375 | ||
1376 | EXPORT_SYMBOL_GPL(device_move); |