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> |
da231fd5 | 21 | #include <linux/genhd.h> |
815d2d50 | 22 | #include <linux/kallsyms.h> |
6188e10d | 23 | #include <linux/semaphore.h> |
f75b1c60 | 24 | #include <linux/mutex.h> |
401097ea | 25 | #include <linux/async.h> |
1da177e4 LT |
26 | |
27 | #include "base.h" | |
28 | #include "power/power.h" | |
29 | ||
4a3ad20c GKH |
30 | int (*platform_notify)(struct device *dev) = NULL; |
31 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
32 | static struct kobject *dev_kobj; |
33 | struct kobject *sysfs_dev_char_kobj; | |
34 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 35 | |
4e886c29 GKH |
36 | #ifdef CONFIG_BLOCK |
37 | static inline int device_is_not_partition(struct device *dev) | |
38 | { | |
39 | return !(dev->type == &part_type); | |
40 | } | |
41 | #else | |
42 | static inline int device_is_not_partition(struct device *dev) | |
43 | { | |
44 | return 1; | |
45 | } | |
46 | #endif | |
1da177e4 | 47 | |
3e95637a AS |
48 | /** |
49 | * dev_driver_string - Return a device's driver name, if at all possible | |
50 | * @dev: struct device to get the name of | |
51 | * | |
52 | * Will return the device's driver's name if it is bound to a device. If | |
53 | * the device is not bound to a device, it will return the name of the bus | |
54 | * it is attached to. If it is not attached to a bus either, an empty | |
55 | * string will be returned. | |
56 | */ | |
bf9ca69f | 57 | const char *dev_driver_string(const struct device *dev) |
3e95637a AS |
58 | { |
59 | return dev->driver ? dev->driver->name : | |
a456b702 JD |
60 | (dev->bus ? dev->bus->name : |
61 | (dev->class ? dev->class->name : "")); | |
3e95637a | 62 | } |
310a922d | 63 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 64 | |
1da177e4 LT |
65 | #define to_dev(obj) container_of(obj, struct device, kobj) |
66 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
67 | ||
4a3ad20c GKH |
68 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
69 | char *buf) | |
1da177e4 | 70 | { |
4a3ad20c GKH |
71 | struct device_attribute *dev_attr = to_dev_attr(attr); |
72 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 73 | ssize_t ret = -EIO; |
1da177e4 LT |
74 | |
75 | if (dev_attr->show) | |
54b6f35c | 76 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
77 | if (ret >= (ssize_t)PAGE_SIZE) { |
78 | print_symbol("dev_attr_show: %s returned bad count\n", | |
79 | (unsigned long)dev_attr->show); | |
80 | } | |
1da177e4 LT |
81 | return ret; |
82 | } | |
83 | ||
4a3ad20c GKH |
84 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
85 | const char *buf, size_t count) | |
1da177e4 | 86 | { |
4a3ad20c GKH |
87 | struct device_attribute *dev_attr = to_dev_attr(attr); |
88 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 89 | ssize_t ret = -EIO; |
1da177e4 LT |
90 | |
91 | if (dev_attr->store) | |
54b6f35c | 92 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
93 | return ret; |
94 | } | |
95 | ||
96 | static struct sysfs_ops dev_sysfs_ops = { | |
97 | .show = dev_attr_show, | |
98 | .store = dev_attr_store, | |
99 | }; | |
100 | ||
101 | ||
102 | /** | |
103 | * device_release - free device structure. | |
104 | * @kobj: device's kobject. | |
105 | * | |
106 | * This is called once the reference count for the object | |
107 | * reaches 0. We forward the call to the device's release | |
108 | * method, which should handle actually freeing the structure. | |
109 | */ | |
4a3ad20c | 110 | static void device_release(struct kobject *kobj) |
1da177e4 | 111 | { |
4a3ad20c | 112 | struct device *dev = to_dev(kobj); |
fb069a5d | 113 | struct device_private *p = dev->p; |
1da177e4 LT |
114 | |
115 | if (dev->release) | |
116 | dev->release(dev); | |
f9f852df KS |
117 | else if (dev->type && dev->type->release) |
118 | dev->type->release(dev); | |
2620efef GKH |
119 | else if (dev->class && dev->class->dev_release) |
120 | dev->class->dev_release(dev); | |
f810a5cf AV |
121 | else |
122 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 123 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 124 | dev_name(dev)); |
fb069a5d | 125 | kfree(p); |
1da177e4 LT |
126 | } |
127 | ||
8f4afc41 | 128 | static struct kobj_type device_ktype = { |
1da177e4 LT |
129 | .release = device_release, |
130 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
131 | }; |
132 | ||
133 | ||
312c004d | 134 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
135 | { |
136 | struct kobj_type *ktype = get_ktype(kobj); | |
137 | ||
8f4afc41 | 138 | if (ktype == &device_ktype) { |
1da177e4 LT |
139 | struct device *dev = to_dev(kobj); |
140 | if (dev->bus) | |
141 | return 1; | |
23681e47 GKH |
142 | if (dev->class) |
143 | return 1; | |
1da177e4 LT |
144 | } |
145 | return 0; | |
146 | } | |
147 | ||
312c004d | 148 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
149 | { |
150 | struct device *dev = to_dev(kobj); | |
151 | ||
23681e47 GKH |
152 | if (dev->bus) |
153 | return dev->bus->name; | |
154 | if (dev->class) | |
155 | return dev->class->name; | |
156 | return NULL; | |
1da177e4 LT |
157 | } |
158 | ||
7eff2e7a KS |
159 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
160 | struct kobj_uevent_env *env) | |
1da177e4 LT |
161 | { |
162 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
163 | int retval = 0; |
164 | ||
6fcf53ac | 165 | /* add device node properties if present */ |
23681e47 | 166 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
167 | const char *tmp; |
168 | const char *name; | |
169 | ||
7eff2e7a KS |
170 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
171 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
6fcf53ac KS |
172 | name = device_get_nodename(dev, &tmp); |
173 | if (name) { | |
174 | add_uevent_var(env, "DEVNAME=%s", name); | |
175 | kfree(tmp); | |
176 | } | |
23681e47 GKH |
177 | } |
178 | ||
414264f9 | 179 | if (dev->type && dev->type->name) |
7eff2e7a | 180 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 181 | |
239378f1 | 182 | if (dev->driver) |
7eff2e7a | 183 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 184 | |
a87cb2ac | 185 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
186 | if (dev->class) { |
187 | struct device *parent = dev->parent; | |
188 | ||
189 | /* find first bus device in parent chain */ | |
190 | while (parent && !parent->bus) | |
191 | parent = parent->parent; | |
192 | if (parent && parent->bus) { | |
193 | const char *path; | |
194 | ||
195 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 196 | if (path) { |
7eff2e7a | 197 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
198 | kfree(path); |
199 | } | |
239378f1 | 200 | |
7eff2e7a | 201 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
202 | |
203 | if (parent->driver) | |
7eff2e7a KS |
204 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
205 | parent->driver->name); | |
239378f1 KS |
206 | } |
207 | } else if (dev->bus) { | |
7eff2e7a | 208 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
209 | |
210 | if (dev->driver) | |
4a3ad20c GKH |
211 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
212 | dev->driver->name); | |
d81d9d6b | 213 | } |
239378f1 | 214 | #endif |
1da177e4 | 215 | |
7eff2e7a | 216 | /* have the bus specific function add its stuff */ |
312c004d | 217 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 218 | retval = dev->bus->uevent(dev, env); |
f9f852df | 219 | if (retval) |
7dc72b28 | 220 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 221 | dev_name(dev), __func__, retval); |
1da177e4 LT |
222 | } |
223 | ||
7eff2e7a | 224 | /* have the class specific function add its stuff */ |
2620efef | 225 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 226 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 227 | if (retval) |
7dc72b28 | 228 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 229 | "returned %d\n", dev_name(dev), |
2b3a302a | 230 | __func__, retval); |
f9f852df KS |
231 | } |
232 | ||
7eff2e7a | 233 | /* have the device type specific fuction add its stuff */ |
f9f852df | 234 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 235 | retval = dev->type->uevent(dev, env); |
f9f852df | 236 | if (retval) |
7dc72b28 | 237 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 238 | "returned %d\n", dev_name(dev), |
2b3a302a | 239 | __func__, 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; | |
7eff2e7a | 256 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
257 | int i; |
258 | size_t count = 0; | |
259 | int retval; | |
260 | ||
261 | /* search the kset, the device belongs to */ | |
262 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
263 | while (!top_kobj->kset && top_kobj->parent) |
264 | top_kobj = top_kobj->parent; | |
16574dcc KS |
265 | if (!top_kobj->kset) |
266 | goto out; | |
5c5daf65 | 267 | |
16574dcc KS |
268 | kset = top_kobj->kset; |
269 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
270 | goto out; | |
271 | ||
272 | /* respect filter */ | |
273 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
274 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
275 | goto out; | |
276 | ||
7eff2e7a KS |
277 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
278 | if (!env) | |
c7308c81 GKH |
279 | return -ENOMEM; |
280 | ||
16574dcc | 281 | /* let the kset specific function add its keys */ |
7eff2e7a | 282 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
283 | if (retval) |
284 | goto out; | |
285 | ||
286 | /* copy keys to file */ | |
7eff2e7a KS |
287 | for (i = 0; i < env->envp_idx; i++) |
288 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 289 | out: |
7eff2e7a | 290 | kfree(env); |
16574dcc KS |
291 | return count; |
292 | } | |
293 | ||
a7fd6706 KS |
294 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
295 | const char *buf, size_t count) | |
296 | { | |
60a96a59 KS |
297 | enum kobject_action action; |
298 | ||
5c5daf65 | 299 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
300 | kobject_uevent(&dev->kobj, action); |
301 | goto out; | |
302 | } | |
303 | ||
304 | dev_err(dev, "uevent: unsupported action-string; this will " | |
305 | "be ignored in a future kernel version\n"); | |
312c004d | 306 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 307 | out: |
a7fd6706 KS |
308 | return count; |
309 | } | |
310 | ||
ad6a1e1c TH |
311 | static struct device_attribute uevent_attr = |
312 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
313 | ||
621a1672 DT |
314 | static int device_add_attributes(struct device *dev, |
315 | struct device_attribute *attrs) | |
de0ff00d | 316 | { |
621a1672 | 317 | int error = 0; |
de0ff00d | 318 | int i; |
621a1672 DT |
319 | |
320 | if (attrs) { | |
321 | for (i = 0; attr_name(attrs[i]); i++) { | |
322 | error = device_create_file(dev, &attrs[i]); | |
323 | if (error) | |
324 | break; | |
325 | } | |
326 | if (error) | |
327 | while (--i >= 0) | |
328 | device_remove_file(dev, &attrs[i]); | |
329 | } | |
330 | return error; | |
331 | } | |
332 | ||
333 | static void device_remove_attributes(struct device *dev, | |
334 | struct device_attribute *attrs) | |
335 | { | |
336 | int i; | |
337 | ||
338 | if (attrs) | |
339 | for (i = 0; attr_name(attrs[i]); i++) | |
340 | device_remove_file(dev, &attrs[i]); | |
341 | } | |
342 | ||
343 | static int device_add_groups(struct device *dev, | |
a4dbd674 | 344 | const struct attribute_group **groups) |
621a1672 | 345 | { |
de0ff00d | 346 | int error = 0; |
621a1672 | 347 | int i; |
de0ff00d | 348 | |
621a1672 DT |
349 | if (groups) { |
350 | for (i = 0; groups[i]; i++) { | |
351 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
352 | if (error) { |
353 | while (--i >= 0) | |
4a3ad20c GKH |
354 | sysfs_remove_group(&dev->kobj, |
355 | groups[i]); | |
621a1672 | 356 | break; |
de0ff00d GKH |
357 | } |
358 | } | |
359 | } | |
de0ff00d GKH |
360 | return error; |
361 | } | |
362 | ||
621a1672 | 363 | static void device_remove_groups(struct device *dev, |
a4dbd674 | 364 | const struct attribute_group **groups) |
de0ff00d GKH |
365 | { |
366 | int i; | |
621a1672 DT |
367 | |
368 | if (groups) | |
369 | for (i = 0; groups[i]; i++) | |
370 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
371 | } |
372 | ||
2620efef GKH |
373 | static int device_add_attrs(struct device *dev) |
374 | { | |
375 | struct class *class = dev->class; | |
f9f852df | 376 | struct device_type *type = dev->type; |
621a1672 | 377 | int error; |
2620efef | 378 | |
621a1672 DT |
379 | if (class) { |
380 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 381 | if (error) |
621a1672 | 382 | return error; |
2620efef | 383 | } |
f9f852df | 384 | |
621a1672 DT |
385 | if (type) { |
386 | error = device_add_groups(dev, type->groups); | |
f9f852df | 387 | if (error) |
621a1672 | 388 | goto err_remove_class_attrs; |
f9f852df KS |
389 | } |
390 | ||
621a1672 DT |
391 | error = device_add_groups(dev, dev->groups); |
392 | if (error) | |
393 | goto err_remove_type_groups; | |
394 | ||
395 | return 0; | |
396 | ||
397 | err_remove_type_groups: | |
398 | if (type) | |
399 | device_remove_groups(dev, type->groups); | |
400 | err_remove_class_attrs: | |
401 | if (class) | |
402 | device_remove_attributes(dev, class->dev_attrs); | |
403 | ||
2620efef GKH |
404 | return error; |
405 | } | |
406 | ||
407 | static void device_remove_attrs(struct device *dev) | |
408 | { | |
409 | struct class *class = dev->class; | |
f9f852df | 410 | struct device_type *type = dev->type; |
2620efef | 411 | |
621a1672 | 412 | device_remove_groups(dev, dev->groups); |
f9f852df | 413 | |
621a1672 DT |
414 | if (type) |
415 | device_remove_groups(dev, type->groups); | |
416 | ||
417 | if (class) | |
418 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
419 | } |
420 | ||
421 | ||
23681e47 GKH |
422 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
423 | char *buf) | |
424 | { | |
425 | return print_dev_t(buf, dev->devt); | |
426 | } | |
427 | ||
ad6a1e1c TH |
428 | static struct device_attribute devt_attr = |
429 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
430 | ||
881c6cfd GKH |
431 | /* kset to create /sys/devices/ */ |
432 | struct kset *devices_kset; | |
1da177e4 | 433 | |
1da177e4 | 434 | /** |
4a3ad20c GKH |
435 | * device_create_file - create sysfs attribute file for device. |
436 | * @dev: device. | |
437 | * @attr: device attribute descriptor. | |
1da177e4 | 438 | */ |
4a3ad20c | 439 | int device_create_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
440 | { |
441 | int error = 0; | |
0c98b19f | 442 | if (dev) |
1da177e4 | 443 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
444 | return error; |
445 | } | |
446 | ||
447 | /** | |
4a3ad20c GKH |
448 | * device_remove_file - remove sysfs attribute file. |
449 | * @dev: device. | |
450 | * @attr: device attribute descriptor. | |
1da177e4 | 451 | */ |
4a3ad20c | 452 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
1da177e4 | 453 | { |
0c98b19f | 454 | if (dev) |
1da177e4 | 455 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
456 | } |
457 | ||
2589f188 GKH |
458 | /** |
459 | * device_create_bin_file - create sysfs binary attribute file for device. | |
460 | * @dev: device. | |
461 | * @attr: device binary attribute descriptor. | |
462 | */ | |
463 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
464 | { | |
465 | int error = -EINVAL; | |
466 | if (dev) | |
467 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
468 | return error; | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
471 | ||
472 | /** | |
473 | * device_remove_bin_file - remove sysfs binary attribute file | |
474 | * @dev: device. | |
475 | * @attr: device binary attribute descriptor. | |
476 | */ | |
477 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
478 | { | |
479 | if (dev) | |
480 | sysfs_remove_bin_file(&dev->kobj, attr); | |
481 | } | |
482 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
483 | ||
d9a9cdfb | 484 | /** |
523ded71 | 485 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
486 | * @dev: device. |
487 | * @func: callback function to invoke later. | |
523ded71 | 488 | * @owner: module owning the callback routine |
d9a9cdfb AS |
489 | * |
490 | * Attribute methods must not unregister themselves or their parent device | |
491 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
492 | * since unregistration is mutually exclusive with driver callbacks. | |
493 | * | |
494 | * Instead methods can call this routine, which will attempt to allocate | |
495 | * and schedule a workqueue request to call back @func with @dev as its | |
496 | * argument in the workqueue's process context. @dev will be pinned until | |
497 | * @func returns. | |
498 | * | |
523ded71 AS |
499 | * This routine is usually called via the inline device_schedule_callback(), |
500 | * which automatically sets @owner to THIS_MODULE. | |
501 | * | |
d9a9cdfb | 502 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 503 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
504 | * |
505 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
506 | * underlying sysfs routine (since it is intended for use by attribute | |
507 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
508 | */ | |
523ded71 AS |
509 | int device_schedule_callback_owner(struct device *dev, |
510 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
511 | { |
512 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 513 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 514 | } |
523ded71 | 515 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 516 | |
34bb61f9 JB |
517 | static void klist_children_get(struct klist_node *n) |
518 | { | |
f791b8c8 GKH |
519 | struct device_private *p = to_device_private_parent(n); |
520 | struct device *dev = p->device; | |
34bb61f9 JB |
521 | |
522 | get_device(dev); | |
523 | } | |
524 | ||
525 | static void klist_children_put(struct klist_node *n) | |
526 | { | |
f791b8c8 GKH |
527 | struct device_private *p = to_device_private_parent(n); |
528 | struct device *dev = p->device; | |
34bb61f9 JB |
529 | |
530 | put_device(dev); | |
531 | } | |
532 | ||
1da177e4 | 533 | /** |
4a3ad20c GKH |
534 | * device_initialize - init device structure. |
535 | * @dev: device. | |
1da177e4 | 536 | * |
5739411a CH |
537 | * This prepares the device for use by other layers by initializing |
538 | * its fields. | |
4a3ad20c | 539 | * It is the first half of device_register(), if called by |
5739411a CH |
540 | * that function, though it can also be called separately, so one |
541 | * may use @dev's fields. In particular, get_device()/put_device() | |
542 | * may be used for reference counting of @dev after calling this | |
543 | * function. | |
544 | * | |
545 | * NOTE: Use put_device() to give up your reference instead of freeing | |
546 | * @dev directly once you have called this function. | |
1da177e4 | 547 | */ |
1da177e4 LT |
548 | void device_initialize(struct device *dev) |
549 | { | |
881c6cfd | 550 | dev->kobj.kset = devices_kset; |
f9cb074b | 551 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 552 | INIT_LIST_HEAD(&dev->dma_pools); |
af70316a | 553 | init_MUTEX(&dev->sem); |
9ac7849e TH |
554 | spin_lock_init(&dev->devres_lock); |
555 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 556 | device_init_wakeup(dev, 0); |
3b98aeaf | 557 | device_pm_init(dev); |
87348136 | 558 | set_dev_node(dev, -1); |
1da177e4 LT |
559 | } |
560 | ||
40fa5422 | 561 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
562 | static struct kobject *get_device_parent(struct device *dev, |
563 | struct device *parent) | |
40fa5422 | 564 | { |
da231fd5 | 565 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 566 | if (dev->class && (!parent || parent->class != dev->class)) |
1fbfee6c | 567 | return &dev->class->p->class_subsys.kobj; |
da231fd5 | 568 | /* all other devices keep their parent */ |
40fa5422 | 569 | else if (parent) |
c744aeae | 570 | return &parent->kobj; |
40fa5422 | 571 | |
c744aeae | 572 | return NULL; |
40fa5422 | 573 | } |
da231fd5 KS |
574 | |
575 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
576 | static inline void cleanup_glue_dir(struct device *dev, |
577 | struct kobject *glue_dir) {} | |
40fa5422 | 578 | #else |
86406245 | 579 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 580 | { |
86406245 | 581 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 582 | |
86406245 | 583 | if (!virtual_dir) |
4ff6abff | 584 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 585 | &devices_kset->kobj); |
f0ee61a6 | 586 | |
86406245 | 587 | return virtual_dir; |
f0ee61a6 GKH |
588 | } |
589 | ||
da231fd5 KS |
590 | static struct kobject *get_device_parent(struct device *dev, |
591 | struct device *parent) | |
40fa5422 | 592 | { |
43968d2f GKH |
593 | int retval; |
594 | ||
86406245 KS |
595 | if (dev->class) { |
596 | struct kobject *kobj = NULL; | |
597 | struct kobject *parent_kobj; | |
598 | struct kobject *k; | |
599 | ||
600 | /* | |
601 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
602 | * Class-devices with a non class-device as parent, live |
603 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
604 | */ |
605 | if (parent == NULL) | |
606 | parent_kobj = virtual_device_parent(dev); | |
607 | else if (parent->class) | |
608 | return &parent->kobj; | |
609 | else | |
610 | parent_kobj = &parent->kobj; | |
611 | ||
612 | /* find our class-directory at the parent and reference it */ | |
7c71448b GKH |
613 | spin_lock(&dev->class->p->class_dirs.list_lock); |
614 | list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) | |
86406245 KS |
615 | if (k->parent == parent_kobj) { |
616 | kobj = kobject_get(k); | |
617 | break; | |
618 | } | |
7c71448b | 619 | spin_unlock(&dev->class->p->class_dirs.list_lock); |
86406245 KS |
620 | if (kobj) |
621 | return kobj; | |
622 | ||
623 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
624 | k = kobject_create(); |
625 | if (!k) | |
626 | return NULL; | |
7c71448b | 627 | k->kset = &dev->class->p->class_dirs; |
b2d6db58 | 628 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f GKH |
629 | if (retval < 0) { |
630 | kobject_put(k); | |
631 | return NULL; | |
632 | } | |
0f4dafc0 | 633 | /* do not emit an uevent for this simple "glue" directory */ |
43968d2f | 634 | return k; |
86406245 KS |
635 | } |
636 | ||
637 | if (parent) | |
c744aeae CH |
638 | return &parent->kobj; |
639 | return NULL; | |
640 | } | |
da231fd5 | 641 | |
63b6971a | 642 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 643 | { |
0f4dafc0 | 644 | /* see if we live in a "glue" directory */ |
c1fe539a | 645 | if (!glue_dir || !dev->class || |
7c71448b | 646 | glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5 KS |
647 | return; |
648 | ||
0f4dafc0 | 649 | kobject_put(glue_dir); |
da231fd5 | 650 | } |
63b6971a CH |
651 | |
652 | static void cleanup_device_parent(struct device *dev) | |
653 | { | |
654 | cleanup_glue_dir(dev, dev->kobj.parent); | |
655 | } | |
c744aeae | 656 | #endif |
86406245 | 657 | |
63b6971a | 658 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
659 | { |
660 | struct kobject *kobj; | |
661 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
662 | if (kobj) |
663 | dev->kobj.parent = kobj; | |
40fa5422 | 664 | } |
40fa5422 | 665 | |
2ee97caf CH |
666 | static int device_add_class_symlinks(struct device *dev) |
667 | { | |
668 | int error; | |
669 | ||
670 | if (!dev->class) | |
671 | return 0; | |
da231fd5 | 672 | |
1fbfee6c GKH |
673 | error = sysfs_create_link(&dev->kobj, |
674 | &dev->class->p->class_subsys.kobj, | |
2ee97caf CH |
675 | "subsystem"); |
676 | if (error) | |
677 | goto out; | |
da231fd5 KS |
678 | |
679 | #ifdef CONFIG_SYSFS_DEPRECATED | |
680 | /* stacked class devices need a symlink in the class directory */ | |
1fbfee6c | 681 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 682 | device_is_not_partition(dev)) { |
1fbfee6c | 683 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 684 | &dev->kobj, dev_name(dev)); |
2ee97caf CH |
685 | if (error) |
686 | goto out_subsys; | |
687 | } | |
da231fd5 | 688 | |
4e886c29 | 689 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
690 | struct device *parent = dev->parent; |
691 | char *class_name; | |
4f01a757 | 692 | |
da231fd5 KS |
693 | /* |
694 | * stacked class devices have the 'device' link | |
695 | * pointing to the bus device instead of the parent | |
696 | */ | |
697 | while (parent->class && !parent->bus && parent->parent) | |
698 | parent = parent->parent; | |
699 | ||
700 | error = sysfs_create_link(&dev->kobj, | |
701 | &parent->kobj, | |
4f01a757 DT |
702 | "device"); |
703 | if (error) | |
704 | goto out_busid; | |
da231fd5 KS |
705 | |
706 | class_name = make_class_name(dev->class->name, | |
707 | &dev->kobj); | |
708 | if (class_name) | |
709 | error = sysfs_create_link(&dev->parent->kobj, | |
710 | &dev->kobj, class_name); | |
711 | kfree(class_name); | |
712 | if (error) | |
713 | goto out_device; | |
2ee97caf CH |
714 | } |
715 | return 0; | |
716 | ||
2ee97caf | 717 | out_device: |
4e886c29 | 718 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 719 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 720 | out_busid: |
1fbfee6c | 721 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 722 | device_is_not_partition(dev)) |
1fbfee6c | 723 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 724 | dev_name(dev)); |
da231fd5 KS |
725 | #else |
726 | /* link in the class directory pointing to the device */ | |
1fbfee6c | 727 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 728 | &dev->kobj, dev_name(dev)); |
da231fd5 KS |
729 | if (error) |
730 | goto out_subsys; | |
731 | ||
4e886c29 | 732 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
733 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
734 | "device"); | |
735 | if (error) | |
736 | goto out_busid; | |
737 | } | |
738 | return 0; | |
739 | ||
740 | out_busid: | |
1e0b2cf9 | 741 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
742 | #endif |
743 | ||
2ee97caf CH |
744 | out_subsys: |
745 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
746 | out: | |
747 | return error; | |
748 | } | |
749 | ||
750 | static void device_remove_class_symlinks(struct device *dev) | |
751 | { | |
752 | if (!dev->class) | |
753 | return; | |
da231fd5 | 754 | |
2ee97caf | 755 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 756 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
757 | char *class_name; |
758 | ||
759 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
760 | if (class_name) { | |
761 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
762 | kfree(class_name); | |
763 | } | |
2ee97caf CH |
764 | sysfs_remove_link(&dev->kobj, "device"); |
765 | } | |
da231fd5 | 766 | |
1fbfee6c | 767 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 768 | device_is_not_partition(dev)) |
1fbfee6c | 769 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 770 | dev_name(dev)); |
da231fd5 | 771 | #else |
4e886c29 | 772 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
773 | sysfs_remove_link(&dev->kobj, "device"); |
774 | ||
1e0b2cf9 | 775 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
776 | #endif |
777 | ||
2ee97caf CH |
778 | sysfs_remove_link(&dev->kobj, "subsystem"); |
779 | } | |
780 | ||
413c239f SR |
781 | /** |
782 | * dev_set_name - set a device name | |
783 | * @dev: device | |
46232366 | 784 | * @fmt: format string for the device's name |
413c239f SR |
785 | */ |
786 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
787 | { | |
788 | va_list vargs; | |
1fa5ae85 | 789 | int err; |
413c239f SR |
790 | |
791 | va_start(vargs, fmt); | |
1fa5ae85 | 792 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 793 | va_end(vargs); |
1fa5ae85 | 794 | return err; |
413c239f SR |
795 | } |
796 | EXPORT_SYMBOL_GPL(dev_set_name); | |
797 | ||
e105b8bf DW |
798 | /** |
799 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
800 | * @dev: device | |
801 | * | |
802 | * By default we select char/ for new entries. Setting class->dev_obj | |
803 | * to NULL prevents an entry from being created. class->dev_kobj must | |
804 | * be set (or cleared) before any devices are registered to the class | |
805 | * otherwise device_create_sys_dev_entry() and | |
806 | * device_remove_sys_dev_entry() will disagree about the the presence | |
807 | * of the link. | |
808 | */ | |
809 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
810 | { | |
811 | struct kobject *kobj; | |
812 | ||
813 | if (dev->class) | |
814 | kobj = dev->class->dev_kobj; | |
815 | else | |
816 | kobj = sysfs_dev_char_kobj; | |
817 | ||
818 | return kobj; | |
819 | } | |
820 | ||
821 | static int device_create_sys_dev_entry(struct device *dev) | |
822 | { | |
823 | struct kobject *kobj = device_to_dev_kobj(dev); | |
824 | int error = 0; | |
825 | char devt_str[15]; | |
826 | ||
827 | if (kobj) { | |
828 | format_dev_t(devt_str, dev->devt); | |
829 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
830 | } | |
831 | ||
832 | return error; | |
833 | } | |
834 | ||
835 | static void device_remove_sys_dev_entry(struct device *dev) | |
836 | { | |
837 | struct kobject *kobj = device_to_dev_kobj(dev); | |
838 | char devt_str[15]; | |
839 | ||
840 | if (kobj) { | |
841 | format_dev_t(devt_str, dev->devt); | |
842 | sysfs_remove_link(kobj, devt_str); | |
843 | } | |
844 | } | |
845 | ||
b4028437 GKH |
846 | int device_private_init(struct device *dev) |
847 | { | |
848 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
849 | if (!dev->p) | |
850 | return -ENOMEM; | |
851 | dev->p->device = dev; | |
852 | klist_init(&dev->p->klist_children, klist_children_get, | |
853 | klist_children_put); | |
854 | return 0; | |
855 | } | |
856 | ||
1da177e4 | 857 | /** |
4a3ad20c GKH |
858 | * device_add - add device to device hierarchy. |
859 | * @dev: device. | |
1da177e4 | 860 | * |
4a3ad20c GKH |
861 | * This is part 2 of device_register(), though may be called |
862 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 863 | * |
5739411a | 864 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
865 | * to the global and sibling lists for the device, then |
866 | * adds it to the other relevant subsystems of the driver model. | |
5739411a CH |
867 | * |
868 | * NOTE: _Never_ directly free @dev after calling this function, even | |
869 | * if it returned an error! Always use put_device() to give up your | |
870 | * reference instead. | |
1da177e4 LT |
871 | */ |
872 | int device_add(struct device *dev) | |
873 | { | |
874 | struct device *parent = NULL; | |
c47ed219 | 875 | struct class_interface *class_intf; |
c906a48a | 876 | int error = -EINVAL; |
775b64d2 | 877 | |
1da177e4 | 878 | dev = get_device(dev); |
c906a48a GKH |
879 | if (!dev) |
880 | goto done; | |
881 | ||
fb069a5d | 882 | if (!dev->p) { |
b4028437 GKH |
883 | error = device_private_init(dev); |
884 | if (error) | |
885 | goto done; | |
fb069a5d | 886 | } |
fb069a5d | 887 | |
1fa5ae85 KS |
888 | /* |
889 | * for statically allocated devices, which should all be converted | |
890 | * some day, we need to initialize the name. We prevent reading back | |
891 | * the name, and force the use of dev_name() | |
892 | */ | |
893 | if (dev->init_name) { | |
acc0e90f | 894 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
895 | dev->init_name = NULL; |
896 | } | |
c906a48a | 897 | |
1fa5ae85 | 898 | if (!dev_name(dev)) |
5c8563d7 | 899 | goto name_error; |
1da177e4 | 900 | |
1e0b2cf9 | 901 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 902 | |
1da177e4 | 903 | parent = get_device(dev->parent); |
63b6971a | 904 | setup_parent(dev, parent); |
1da177e4 | 905 | |
0d358f22 YL |
906 | /* use parent numa_node */ |
907 | if (parent) | |
908 | set_dev_node(dev, dev_to_node(parent)); | |
909 | ||
1da177e4 | 910 | /* first, register with generic layer. */ |
8a577ffc KS |
911 | /* we require the name to be set before, and pass NULL */ |
912 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 913 | if (error) |
1da177e4 | 914 | goto Error; |
a7fd6706 | 915 | |
37022644 BW |
916 | /* notify platform of device entry */ |
917 | if (platform_notify) | |
918 | platform_notify(dev); | |
919 | ||
ad6a1e1c | 920 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
921 | if (error) |
922 | goto attrError; | |
a7fd6706 | 923 | |
23681e47 | 924 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
925 | error = device_create_file(dev, &devt_attr); |
926 | if (error) | |
a306eea4 | 927 | goto ueventattrError; |
e105b8bf DW |
928 | |
929 | error = device_create_sys_dev_entry(dev); | |
930 | if (error) | |
931 | goto devtattrError; | |
23681e47 GKH |
932 | } |
933 | ||
2ee97caf CH |
934 | error = device_add_class_symlinks(dev); |
935 | if (error) | |
936 | goto SymlinkError; | |
dc0afa83 CH |
937 | error = device_add_attrs(dev); |
938 | if (error) | |
2620efef | 939 | goto AttrsError; |
dc0afa83 CH |
940 | error = bus_add_device(dev); |
941 | if (error) | |
1da177e4 | 942 | goto BusError; |
3b98aeaf | 943 | error = dpm_sysfs_add(dev); |
57eee3d2 | 944 | if (error) |
3b98aeaf AS |
945 | goto DPMError; |
946 | device_pm_add(dev); | |
ec0676ee AS |
947 | |
948 | /* Notify clients of device addition. This call must come | |
949 | * after dpm_sysf_add() and before kobject_uevent(). | |
950 | */ | |
951 | if (dev->bus) | |
952 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
953 | BUS_NOTIFY_ADD_DEVICE, dev); | |
954 | ||
83b5fb4c | 955 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 956 | bus_probe_device(dev); |
1da177e4 | 957 | if (parent) |
f791b8c8 GKH |
958 | klist_add_tail(&dev->p->knode_parent, |
959 | &parent->p->klist_children); | |
1da177e4 | 960 | |
5d9fd169 | 961 | if (dev->class) { |
f75b1c60 | 962 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 963 | /* tie the class to the device */ |
5a3ceb86 TH |
964 | klist_add_tail(&dev->knode_class, |
965 | &dev->class->p->class_devices); | |
c47ed219 GKH |
966 | |
967 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
968 | list_for_each_entry(class_intf, |
969 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
970 | if (class_intf->add_dev) |
971 | class_intf->add_dev(dev, class_intf); | |
f75b1c60 | 972 | mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169 | 973 | } |
c906a48a | 974 | done: |
1da177e4 LT |
975 | put_device(dev); |
976 | return error; | |
3b98aeaf | 977 | DPMError: |
57eee3d2 RW |
978 | bus_remove_device(dev); |
979 | BusError: | |
82f0cf9b | 980 | device_remove_attrs(dev); |
2620efef | 981 | AttrsError: |
2ee97caf CH |
982 | device_remove_class_symlinks(dev); |
983 | SymlinkError: | |
e105b8bf DW |
984 | if (MAJOR(dev->devt)) |
985 | device_remove_sys_dev_entry(dev); | |
986 | devtattrError: | |
ad6a1e1c TH |
987 | if (MAJOR(dev->devt)) |
988 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 989 | ueventattrError: |
ad6a1e1c | 990 | device_remove_file(dev, &uevent_attr); |
23681e47 | 991 | attrError: |
312c004d | 992 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
993 | kobject_del(&dev->kobj); |
994 | Error: | |
63b6971a | 995 | cleanup_device_parent(dev); |
1da177e4 LT |
996 | if (parent) |
997 | put_device(parent); | |
5c8563d7 KS |
998 | name_error: |
999 | kfree(dev->p); | |
1000 | dev->p = NULL; | |
c906a48a | 1001 | goto done; |
1da177e4 LT |
1002 | } |
1003 | ||
1da177e4 | 1004 | /** |
4a3ad20c GKH |
1005 | * device_register - register a device with the system. |
1006 | * @dev: pointer to the device structure | |
1da177e4 | 1007 | * |
4a3ad20c GKH |
1008 | * This happens in two clean steps - initialize the device |
1009 | * and add it to the system. The two steps can be called | |
1010 | * separately, but this is the easiest and most common. | |
1011 | * I.e. you should only call the two helpers separately if | |
1012 | * have a clearly defined need to use and refcount the device | |
1013 | * before it is added to the hierarchy. | |
5739411a CH |
1014 | * |
1015 | * NOTE: _Never_ directly free @dev after calling this function, even | |
1016 | * if it returned an error! Always use put_device() to give up the | |
1017 | * reference initialized in this function instead. | |
1da177e4 | 1018 | */ |
1da177e4 LT |
1019 | int device_register(struct device *dev) |
1020 | { | |
1021 | device_initialize(dev); | |
1022 | return device_add(dev); | |
1023 | } | |
1024 | ||
1da177e4 | 1025 | /** |
4a3ad20c GKH |
1026 | * get_device - increment reference count for device. |
1027 | * @dev: device. | |
1da177e4 | 1028 | * |
4a3ad20c GKH |
1029 | * This simply forwards the call to kobject_get(), though |
1030 | * we do take care to provide for the case that we get a NULL | |
1031 | * pointer passed in. | |
1da177e4 | 1032 | */ |
4a3ad20c | 1033 | struct device *get_device(struct device *dev) |
1da177e4 LT |
1034 | { |
1035 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
1036 | } | |
1037 | ||
1da177e4 | 1038 | /** |
4a3ad20c GKH |
1039 | * put_device - decrement reference count. |
1040 | * @dev: device in question. | |
1da177e4 | 1041 | */ |
4a3ad20c | 1042 | void put_device(struct device *dev) |
1da177e4 | 1043 | { |
edfaa7c3 | 1044 | /* might_sleep(); */ |
1da177e4 LT |
1045 | if (dev) |
1046 | kobject_put(&dev->kobj); | |
1047 | } | |
1048 | ||
1da177e4 | 1049 | /** |
4a3ad20c GKH |
1050 | * device_del - delete device from system. |
1051 | * @dev: device. | |
1da177e4 | 1052 | * |
4a3ad20c GKH |
1053 | * This is the first part of the device unregistration |
1054 | * sequence. This removes the device from the lists we control | |
1055 | * from here, has it removed from the other driver model | |
1056 | * subsystems it was added to in device_add(), and removes it | |
1057 | * from the kobject hierarchy. | |
1da177e4 | 1058 | * |
4a3ad20c GKH |
1059 | * NOTE: this should be called manually _iff_ device_add() was |
1060 | * also called manually. | |
1da177e4 | 1061 | */ |
4a3ad20c | 1062 | void device_del(struct device *dev) |
1da177e4 | 1063 | { |
4a3ad20c | 1064 | struct device *parent = dev->parent; |
c47ed219 | 1065 | struct class_interface *class_intf; |
1da177e4 | 1066 | |
ec0676ee AS |
1067 | /* Notify clients of device removal. This call must come |
1068 | * before dpm_sysfs_remove(). | |
1069 | */ | |
1070 | if (dev->bus) | |
1071 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1072 | BUS_NOTIFY_DEL_DEVICE, dev); | |
775b64d2 | 1073 | device_pm_remove(dev); |
3b98aeaf | 1074 | dpm_sysfs_remove(dev); |
1da177e4 | 1075 | if (parent) |
f791b8c8 | 1076 | klist_del(&dev->p->knode_parent); |
e105b8bf DW |
1077 | if (MAJOR(dev->devt)) { |
1078 | device_remove_sys_dev_entry(dev); | |
ad6a1e1c | 1079 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1080 | } |
b9d9c82b | 1081 | if (dev->class) { |
da231fd5 | 1082 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1083 | |
f75b1c60 | 1084 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 1085 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1086 | list_for_each_entry(class_intf, |
1087 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1088 | if (class_intf->remove_dev) |
1089 | class_intf->remove_dev(dev, class_intf); | |
1090 | /* remove the device from the class list */ | |
5a3ceb86 | 1091 | klist_del(&dev->knode_class); |
f75b1c60 | 1092 | mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b | 1093 | } |
ad6a1e1c | 1094 | device_remove_file(dev, &uevent_attr); |
2620efef | 1095 | device_remove_attrs(dev); |
28953533 | 1096 | bus_remove_device(dev); |
1da177e4 | 1097 | |
2f8d16a9 TH |
1098 | /* |
1099 | * Some platform devices are driven without driver attached | |
1100 | * and managed resources may have been acquired. Make sure | |
1101 | * all resources are released. | |
1102 | */ | |
1103 | devres_release_all(dev); | |
1104 | ||
1da177e4 LT |
1105 | /* Notify the platform of the removal, in case they |
1106 | * need to do anything... | |
1107 | */ | |
1108 | if (platform_notify_remove) | |
1109 | platform_notify_remove(dev); | |
312c004d | 1110 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1111 | cleanup_device_parent(dev); |
1da177e4 | 1112 | kobject_del(&dev->kobj); |
da231fd5 | 1113 | put_device(parent); |
1da177e4 LT |
1114 | } |
1115 | ||
1116 | /** | |
4a3ad20c GKH |
1117 | * device_unregister - unregister device from system. |
1118 | * @dev: device going away. | |
1da177e4 | 1119 | * |
4a3ad20c GKH |
1120 | * We do this in two parts, like we do device_register(). First, |
1121 | * we remove it from all the subsystems with device_del(), then | |
1122 | * we decrement the reference count via put_device(). If that | |
1123 | * is the final reference count, the device will be cleaned up | |
1124 | * via device_release() above. Otherwise, the structure will | |
1125 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1126 | */ |
4a3ad20c | 1127 | void device_unregister(struct device *dev) |
1da177e4 | 1128 | { |
1e0b2cf9 | 1129 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1130 | device_del(dev); |
1131 | put_device(dev); | |
1132 | } | |
1133 | ||
4a3ad20c | 1134 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1135 | { |
4a3ad20c | 1136 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1137 | struct device *dev = NULL; |
1138 | struct device_private *p; | |
1139 | ||
1140 | if (n) { | |
1141 | p = to_device_private_parent(n); | |
1142 | dev = p->device; | |
1143 | } | |
1144 | return dev; | |
36239577 | 1145 | } |
1146 | ||
6fcf53ac KS |
1147 | /** |
1148 | * device_get_nodename - path of device node file | |
1149 | * @dev: device | |
1150 | * @tmp: possibly allocated string | |
1151 | * | |
1152 | * Return the relative path of a possible device node. | |
1153 | * Non-default names may need to allocate a memory to compose | |
1154 | * a name. This memory is returned in tmp and needs to be | |
1155 | * freed by the caller. | |
1156 | */ | |
1157 | const char *device_get_nodename(struct device *dev, const char **tmp) | |
1158 | { | |
1159 | char *s; | |
1160 | ||
1161 | *tmp = NULL; | |
1162 | ||
1163 | /* the device type may provide a specific name */ | |
1164 | if (dev->type && dev->type->nodename) | |
1165 | *tmp = dev->type->nodename(dev); | |
1166 | if (*tmp) | |
1167 | return *tmp; | |
1168 | ||
1169 | /* the class may provide a specific name */ | |
1170 | if (dev->class && dev->class->nodename) | |
1171 | *tmp = dev->class->nodename(dev); | |
1172 | if (*tmp) | |
1173 | return *tmp; | |
1174 | ||
1175 | /* return name without allocation, tmp == NULL */ | |
1176 | if (strchr(dev_name(dev), '!') == NULL) | |
1177 | return dev_name(dev); | |
1178 | ||
1179 | /* replace '!' in the name with '/' */ | |
1180 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1181 | if (!*tmp) | |
1182 | return NULL; | |
1183 | while ((s = strchr(*tmp, '!'))) | |
1184 | s[0] = '/'; | |
1185 | return *tmp; | |
1186 | } | |
1187 | ||
1da177e4 | 1188 | /** |
4a3ad20c GKH |
1189 | * device_for_each_child - device child iterator. |
1190 | * @parent: parent struct device. | |
1191 | * @data: data for the callback. | |
1192 | * @fn: function to be called for each device. | |
1da177e4 | 1193 | * |
4a3ad20c GKH |
1194 | * Iterate over @parent's child devices, and call @fn for each, |
1195 | * passing it @data. | |
1da177e4 | 1196 | * |
4a3ad20c GKH |
1197 | * We check the return of @fn each time. If it returns anything |
1198 | * other than 0, we break out and return that value. | |
1da177e4 | 1199 | */ |
4a3ad20c GKH |
1200 | int device_for_each_child(struct device *parent, void *data, |
1201 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1202 | { |
36239577 | 1203 | struct klist_iter i; |
4a3ad20c | 1204 | struct device *child; |
1da177e4 LT |
1205 | int error = 0; |
1206 | ||
014c90db GKH |
1207 | if (!parent->p) |
1208 | return 0; | |
1209 | ||
f791b8c8 | 1210 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 | 1211 | while ((child = next_device(&i)) && !error) |
1212 | error = fn(child, data); | |
1213 | klist_iter_exit(&i); | |
1da177e4 LT |
1214 | return error; |
1215 | } | |
1216 | ||
5ab69981 CH |
1217 | /** |
1218 | * device_find_child - device iterator for locating a particular device. | |
1219 | * @parent: parent struct device | |
1220 | * @data: Data to pass to match function | |
1221 | * @match: Callback function to check device | |
1222 | * | |
1223 | * This is similar to the device_for_each_child() function above, but it | |
1224 | * returns a reference to a device that is 'found' for later use, as | |
1225 | * determined by the @match callback. | |
1226 | * | |
1227 | * The callback should return 0 if the device doesn't match and non-zero | |
1228 | * if it does. If the callback returns non-zero and a reference to the | |
1229 | * current device can be obtained, this function will return to the caller | |
1230 | * and not iterate over any more devices. | |
1231 | */ | |
4a3ad20c GKH |
1232 | struct device *device_find_child(struct device *parent, void *data, |
1233 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1234 | { |
1235 | struct klist_iter i; | |
1236 | struct device *child; | |
1237 | ||
1238 | if (!parent) | |
1239 | return NULL; | |
1240 | ||
f791b8c8 | 1241 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1242 | while ((child = next_device(&i))) |
1243 | if (match(child, data) && get_device(child)) | |
1244 | break; | |
1245 | klist_iter_exit(&i); | |
1246 | return child; | |
1247 | } | |
1248 | ||
1da177e4 LT |
1249 | int __init devices_init(void) |
1250 | { | |
881c6cfd GKH |
1251 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1252 | if (!devices_kset) | |
1253 | return -ENOMEM; | |
e105b8bf DW |
1254 | dev_kobj = kobject_create_and_add("dev", NULL); |
1255 | if (!dev_kobj) | |
1256 | goto dev_kobj_err; | |
1257 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1258 | if (!sysfs_dev_block_kobj) | |
1259 | goto block_kobj_err; | |
1260 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1261 | if (!sysfs_dev_char_kobj) | |
1262 | goto char_kobj_err; | |
1263 | ||
881c6cfd | 1264 | return 0; |
e105b8bf DW |
1265 | |
1266 | char_kobj_err: | |
1267 | kobject_put(sysfs_dev_block_kobj); | |
1268 | block_kobj_err: | |
1269 | kobject_put(dev_kobj); | |
1270 | dev_kobj_err: | |
1271 | kset_unregister(devices_kset); | |
1272 | return -ENOMEM; | |
1da177e4 LT |
1273 | } |
1274 | ||
1275 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1276 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1277 | |
1278 | EXPORT_SYMBOL_GPL(device_initialize); | |
1279 | EXPORT_SYMBOL_GPL(device_add); | |
1280 | EXPORT_SYMBOL_GPL(device_register); | |
1281 | ||
1282 | EXPORT_SYMBOL_GPL(device_del); | |
1283 | EXPORT_SYMBOL_GPL(device_unregister); | |
1284 | EXPORT_SYMBOL_GPL(get_device); | |
1285 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1286 | |
1287 | EXPORT_SYMBOL_GPL(device_create_file); | |
1288 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 | 1289 | |
0aa0dc41 MM |
1290 | struct root_device |
1291 | { | |
1292 | struct device dev; | |
1293 | struct module *owner; | |
1294 | }; | |
1295 | ||
1296 | #define to_root_device(dev) container_of(dev, struct root_device, dev) | |
1297 | ||
1298 | static void root_device_release(struct device *dev) | |
1299 | { | |
1300 | kfree(to_root_device(dev)); | |
1301 | } | |
1302 | ||
1303 | /** | |
1304 | * __root_device_register - allocate and register a root device | |
1305 | * @name: root device name | |
1306 | * @owner: owner module of the root device, usually THIS_MODULE | |
1307 | * | |
1308 | * This function allocates a root device and registers it | |
1309 | * using device_register(). In order to free the returned | |
1310 | * device, use root_device_unregister(). | |
1311 | * | |
1312 | * Root devices are dummy devices which allow other devices | |
1313 | * to be grouped under /sys/devices. Use this function to | |
1314 | * allocate a root device and then use it as the parent of | |
1315 | * any device which should appear under /sys/devices/{name} | |
1316 | * | |
1317 | * The /sys/devices/{name} directory will also contain a | |
1318 | * 'module' symlink which points to the @owner directory | |
1319 | * in sysfs. | |
1320 | * | |
1321 | * Note: You probably want to use root_device_register(). | |
1322 | */ | |
1323 | struct device *__root_device_register(const char *name, struct module *owner) | |
1324 | { | |
1325 | struct root_device *root; | |
1326 | int err = -ENOMEM; | |
1327 | ||
1328 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1329 | if (!root) | |
1330 | return ERR_PTR(err); | |
1331 | ||
acc0e90f | 1332 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1333 | if (err) { |
1334 | kfree(root); | |
1335 | return ERR_PTR(err); | |
1336 | } | |
1337 | ||
1338 | root->dev.release = root_device_release; | |
1339 | ||
1340 | err = device_register(&root->dev); | |
1341 | if (err) { | |
1342 | put_device(&root->dev); | |
1343 | return ERR_PTR(err); | |
1344 | } | |
1345 | ||
1346 | #ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */ | |
1347 | if (owner) { | |
1348 | struct module_kobject *mk = &owner->mkobj; | |
1349 | ||
1350 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1351 | if (err) { | |
1352 | device_unregister(&root->dev); | |
1353 | return ERR_PTR(err); | |
1354 | } | |
1355 | root->owner = owner; | |
1356 | } | |
1357 | #endif | |
1358 | ||
1359 | return &root->dev; | |
1360 | } | |
1361 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1362 | ||
1363 | /** | |
1364 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1365 | * @dev: device going away |
0aa0dc41 MM |
1366 | * |
1367 | * This function unregisters and cleans up a device that was created by | |
1368 | * root_device_register(). | |
1369 | */ | |
1370 | void root_device_unregister(struct device *dev) | |
1371 | { | |
1372 | struct root_device *root = to_root_device(dev); | |
1373 | ||
1374 | if (root->owner) | |
1375 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1376 | ||
1377 | device_unregister(dev); | |
1378 | } | |
1379 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1380 | ||
23681e47 GKH |
1381 | |
1382 | static void device_create_release(struct device *dev) | |
1383 | { | |
1e0b2cf9 | 1384 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1385 | kfree(dev); |
1386 | } | |
1387 | ||
1388 | /** | |
8882b394 | 1389 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1390 | * @class: pointer to the struct class that this device should be registered to |
1391 | * @parent: pointer to the parent struct device of this new device, if any | |
1392 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1393 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1394 | * @fmt: string for the device's name |
8882b394 | 1395 | * @args: va_list for the device's name |
42734daf HK |
1396 | * |
1397 | * This function can be used by char device classes. A struct device | |
1398 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1399 | * |
23681e47 GKH |
1400 | * A "dev" file will be created, showing the dev_t for the device, if |
1401 | * the dev_t is not 0,0. | |
42734daf HK |
1402 | * If a pointer to a parent struct device is passed in, the newly created |
1403 | * struct device will be a child of that device in sysfs. | |
1404 | * The pointer to the struct device will be returned from the call. | |
1405 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1406 | * pointer. |
1407 | * | |
1408 | * Note: the struct class passed to this function must have previously | |
1409 | * been created with a call to class_create(). | |
1410 | */ | |
8882b394 GKH |
1411 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1412 | dev_t devt, void *drvdata, const char *fmt, | |
1413 | va_list args) | |
23681e47 | 1414 | { |
23681e47 GKH |
1415 | struct device *dev = NULL; |
1416 | int retval = -ENODEV; | |
1417 | ||
1418 | if (class == NULL || IS_ERR(class)) | |
1419 | goto error; | |
23681e47 GKH |
1420 | |
1421 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1422 | if (!dev) { | |
1423 | retval = -ENOMEM; | |
1424 | goto error; | |
1425 | } | |
1426 | ||
1427 | dev->devt = devt; | |
1428 | dev->class = class; | |
1429 | dev->parent = parent; | |
1430 | dev->release = device_create_release; | |
8882b394 | 1431 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1432 | |
1fa5ae85 KS |
1433 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1434 | if (retval) | |
1435 | goto error; | |
1436 | ||
23681e47 GKH |
1437 | retval = device_register(dev); |
1438 | if (retval) | |
1439 | goto error; | |
1440 | ||
23681e47 GKH |
1441 | return dev; |
1442 | ||
1443 | error: | |
286661b3 | 1444 | put_device(dev); |
23681e47 GKH |
1445 | return ERR_PTR(retval); |
1446 | } | |
8882b394 GKH |
1447 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1448 | ||
1449 | /** | |
4e106739 | 1450 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1451 | * @class: pointer to the struct class that this device should be registered to |
1452 | * @parent: pointer to the parent struct device of this new device, if any | |
1453 | * @devt: the dev_t for the char device to be added | |
1454 | * @drvdata: the data to be added to the device for callbacks | |
1455 | * @fmt: string for the device's name | |
1456 | * | |
1457 | * This function can be used by char device classes. A struct device | |
1458 | * will be created in sysfs, registered to the specified class. | |
1459 | * | |
1460 | * A "dev" file will be created, showing the dev_t for the device, if | |
1461 | * the dev_t is not 0,0. | |
1462 | * If a pointer to a parent struct device is passed in, the newly created | |
1463 | * struct device will be a child of that device in sysfs. | |
1464 | * The pointer to the struct device will be returned from the call. | |
1465 | * Any further sysfs files that might be required can be created using this | |
1466 | * pointer. | |
1467 | * | |
1468 | * Note: the struct class passed to this function must have previously | |
1469 | * been created with a call to class_create(). | |
1470 | */ | |
4e106739 GKH |
1471 | struct device *device_create(struct class *class, struct device *parent, |
1472 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1473 | { |
1474 | va_list vargs; | |
1475 | struct device *dev; | |
1476 | ||
1477 | va_start(vargs, fmt); | |
1478 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1479 | va_end(vargs); | |
1480 | return dev; | |
1481 | } | |
4e106739 | 1482 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1483 | |
cd35449b | 1484 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1485 | { |
cd35449b | 1486 | dev_t *devt = data; |
23681e47 | 1487 | |
cd35449b | 1488 | return dev->devt == *devt; |
775b64d2 RW |
1489 | } |
1490 | ||
1491 | /** | |
1492 | * device_destroy - removes a device that was created with device_create() | |
1493 | * @class: pointer to the struct class that this device was registered with | |
1494 | * @devt: the dev_t of the device that was previously registered | |
1495 | * | |
1496 | * This call unregisters and cleans up a device that was created with a | |
1497 | * call to device_create(). | |
1498 | */ | |
1499 | void device_destroy(struct class *class, dev_t devt) | |
1500 | { | |
1501 | struct device *dev; | |
23681e47 | 1502 | |
695794ae | 1503 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1504 | if (dev) { |
1505 | put_device(dev); | |
23681e47 | 1506 | device_unregister(dev); |
cd35449b | 1507 | } |
23681e47 GKH |
1508 | } |
1509 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1510 | |
1511 | /** | |
1512 | * device_rename - renames a device | |
1513 | * @dev: the pointer to the struct device to be renamed | |
1514 | * @new_name: the new name of the device | |
030c1d2b EB |
1515 | * |
1516 | * It is the responsibility of the caller to provide mutual | |
1517 | * exclusion between two different calls of device_rename | |
1518 | * on the same device to ensure that new_name is valid and | |
1519 | * won't conflict with other devices. | |
a2de48ca GKH |
1520 | */ |
1521 | int device_rename(struct device *dev, char *new_name) | |
1522 | { | |
1523 | char *old_class_name = NULL; | |
1524 | char *new_class_name = NULL; | |
2ee97caf | 1525 | char *old_device_name = NULL; |
a2de48ca GKH |
1526 | int error; |
1527 | ||
1528 | dev = get_device(dev); | |
1529 | if (!dev) | |
1530 | return -EINVAL; | |
1531 | ||
1e0b2cf9 | 1532 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1533 | __func__, new_name); |
a2de48ca | 1534 | |
99ef3ef8 | 1535 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1536 | if ((dev->class) && (dev->parent)) |
1537 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1538 | #endif |
a2de48ca | 1539 | |
1fa5ae85 | 1540 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1541 | if (!old_device_name) { |
1542 | error = -ENOMEM; | |
1543 | goto out; | |
a2de48ca | 1544 | } |
a2de48ca GKH |
1545 | |
1546 | error = kobject_rename(&dev->kobj, new_name); | |
1fa5ae85 | 1547 | if (error) |
2ee97caf | 1548 | goto out; |
a2de48ca | 1549 | |
99ef3ef8 | 1550 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1551 | if (old_class_name) { |
1552 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1553 | if (new_class_name) { | |
36ce6dad CH |
1554 | error = sysfs_create_link_nowarn(&dev->parent->kobj, |
1555 | &dev->kobj, | |
1556 | new_class_name); | |
2ee97caf CH |
1557 | if (error) |
1558 | goto out; | |
a2de48ca GKH |
1559 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1560 | } | |
1561 | } | |
60b8cabd | 1562 | #else |
a2de48ca | 1563 | if (dev->class) { |
36ce6dad | 1564 | error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 1565 | &dev->kobj, dev_name(dev)); |
0599ad53 SH |
1566 | if (error) |
1567 | goto out; | |
1fbfee6c | 1568 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
7c71448b | 1569 | old_device_name); |
a2de48ca | 1570 | } |
60b8cabd KS |
1571 | #endif |
1572 | ||
2ee97caf | 1573 | out: |
a2de48ca GKH |
1574 | put_device(dev); |
1575 | ||
a2de48ca | 1576 | kfree(new_class_name); |
952ab431 | 1577 | kfree(old_class_name); |
2ee97caf | 1578 | kfree(old_device_name); |
a2de48ca GKH |
1579 | |
1580 | return error; | |
1581 | } | |
a2807dbc | 1582 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1583 | |
1584 | static int device_move_class_links(struct device *dev, | |
1585 | struct device *old_parent, | |
1586 | struct device *new_parent) | |
1587 | { | |
f7f3461d | 1588 | int error = 0; |
8a82472f | 1589 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1590 | char *class_name; |
1591 | ||
1592 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1593 | if (!class_name) { | |
cb360bbf | 1594 | error = -ENOMEM; |
8a82472f CH |
1595 | goto out; |
1596 | } | |
1597 | if (old_parent) { | |
1598 | sysfs_remove_link(&dev->kobj, "device"); | |
1599 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1600 | } | |
c744aeae CH |
1601 | if (new_parent) { |
1602 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1603 | "device"); | |
1604 | if (error) | |
1605 | goto out; | |
1606 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1607 | class_name); | |
1608 | if (error) | |
1609 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1610 | } else |
c744aeae | 1611 | error = 0; |
8a82472f CH |
1612 | out: |
1613 | kfree(class_name); | |
1614 | return error; | |
1615 | #else | |
f7f3461d GKH |
1616 | if (old_parent) |
1617 | sysfs_remove_link(&dev->kobj, "device"); | |
1618 | if (new_parent) | |
1619 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1620 | "device"); | |
1621 | return error; | |
8a82472f CH |
1622 | #endif |
1623 | } | |
1624 | ||
1625 | /** | |
1626 | * device_move - moves a device to a new parent | |
1627 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1628 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1629 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1630 | */ |
ffa6a705 CH |
1631 | int device_move(struct device *dev, struct device *new_parent, |
1632 | enum dpm_order dpm_order) | |
8a82472f CH |
1633 | { |
1634 | int error; | |
1635 | struct device *old_parent; | |
c744aeae | 1636 | struct kobject *new_parent_kobj; |
8a82472f CH |
1637 | |
1638 | dev = get_device(dev); | |
1639 | if (!dev) | |
1640 | return -EINVAL; | |
1641 | ||
ffa6a705 | 1642 | device_pm_lock(); |
8a82472f | 1643 | new_parent = get_device(new_parent); |
4a3ad20c | 1644 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1645 | |
1e0b2cf9 KS |
1646 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1647 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1648 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1649 | if (error) { |
63b6971a | 1650 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1651 | put_device(new_parent); |
1652 | goto out; | |
1653 | } | |
1654 | old_parent = dev->parent; | |
1655 | dev->parent = new_parent; | |
1656 | if (old_parent) | |
f791b8c8 | 1657 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1658 | if (new_parent) { |
f791b8c8 GKH |
1659 | klist_add_tail(&dev->p->knode_parent, |
1660 | &new_parent->p->klist_children); | |
0d358f22 YL |
1661 | set_dev_node(dev, dev_to_node(new_parent)); |
1662 | } | |
1663 | ||
8a82472f CH |
1664 | if (!dev->class) |
1665 | goto out_put; | |
1666 | error = device_move_class_links(dev, old_parent, new_parent); | |
1667 | if (error) { | |
1668 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1669 | device_move_class_links(dev, new_parent, old_parent); | |
1670 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae | 1671 | if (new_parent) |
f791b8c8 | 1672 | klist_remove(&dev->p->knode_parent); |
0d358f22 YL |
1673 | dev->parent = old_parent; |
1674 | if (old_parent) { | |
f791b8c8 GKH |
1675 | klist_add_tail(&dev->p->knode_parent, |
1676 | &old_parent->p->klist_children); | |
0d358f22 YL |
1677 | set_dev_node(dev, dev_to_node(old_parent)); |
1678 | } | |
8a82472f | 1679 | } |
63b6971a | 1680 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1681 | put_device(new_parent); |
1682 | goto out; | |
1683 | } | |
ffa6a705 CH |
1684 | switch (dpm_order) { |
1685 | case DPM_ORDER_NONE: | |
1686 | break; | |
1687 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1688 | device_pm_move_after(dev, new_parent); | |
1689 | break; | |
1690 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1691 | device_pm_move_before(new_parent, dev); | |
1692 | break; | |
1693 | case DPM_ORDER_DEV_LAST: | |
1694 | device_pm_move_last(dev); | |
1695 | break; | |
1696 | } | |
8a82472f CH |
1697 | out_put: |
1698 | put_device(old_parent); | |
1699 | out: | |
ffa6a705 | 1700 | device_pm_unlock(); |
8a82472f CH |
1701 | put_device(dev); |
1702 | return error; | |
1703 | } | |
8a82472f | 1704 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1705 | |
1706 | /** | |
1707 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1708 | */ | |
1709 | void device_shutdown(void) | |
1710 | { | |
4a3ad20c | 1711 | struct device *dev, *devn; |
37b0c020 GKH |
1712 | |
1713 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1714 | kobj.entry) { | |
1715 | if (dev->bus && dev->bus->shutdown) { | |
1716 | dev_dbg(dev, "shutdown\n"); | |
1717 | dev->bus->shutdown(dev); | |
1718 | } else if (dev->driver && dev->driver->shutdown) { | |
1719 | dev_dbg(dev, "shutdown\n"); | |
1720 | dev->driver->shutdown(dev); | |
1721 | } | |
1722 | } | |
e105b8bf DW |
1723 | kobject_put(sysfs_dev_char_kobj); |
1724 | kobject_put(sysfs_dev_block_kobj); | |
1725 | kobject_put(dev_kobj); | |
401097ea | 1726 | async_synchronize_full(); |
37b0c020 | 1727 | } |