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; | |
e454cea2 | 169 | mode_t mode = 0; |
6fcf53ac | 170 | |
7eff2e7a KS |
171 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
172 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
e454cea2 | 173 | name = device_get_devnode(dev, &mode, &tmp); |
6fcf53ac KS |
174 | if (name) { |
175 | add_uevent_var(env, "DEVNAME=%s", name); | |
176 | kfree(tmp); | |
e454cea2 KS |
177 | if (mode) |
178 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
6fcf53ac | 179 | } |
23681e47 GKH |
180 | } |
181 | ||
414264f9 | 182 | if (dev->type && dev->type->name) |
7eff2e7a | 183 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 184 | |
239378f1 | 185 | if (dev->driver) |
7eff2e7a | 186 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 187 | |
a87cb2ac | 188 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
189 | if (dev->class) { |
190 | struct device *parent = dev->parent; | |
191 | ||
192 | /* find first bus device in parent chain */ | |
193 | while (parent && !parent->bus) | |
194 | parent = parent->parent; | |
195 | if (parent && parent->bus) { | |
196 | const char *path; | |
197 | ||
198 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 199 | if (path) { |
7eff2e7a | 200 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
201 | kfree(path); |
202 | } | |
239378f1 | 203 | |
7eff2e7a | 204 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
205 | |
206 | if (parent->driver) | |
7eff2e7a KS |
207 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
208 | parent->driver->name); | |
239378f1 KS |
209 | } |
210 | } else if (dev->bus) { | |
7eff2e7a | 211 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
212 | |
213 | if (dev->driver) | |
4a3ad20c GKH |
214 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
215 | dev->driver->name); | |
d81d9d6b | 216 | } |
239378f1 | 217 | #endif |
1da177e4 | 218 | |
7eff2e7a | 219 | /* have the bus specific function add its stuff */ |
312c004d | 220 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 221 | retval = dev->bus->uevent(dev, env); |
f9f852df | 222 | if (retval) |
7dc72b28 | 223 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 224 | dev_name(dev), __func__, retval); |
1da177e4 LT |
225 | } |
226 | ||
7eff2e7a | 227 | /* have the class specific function add its stuff */ |
2620efef | 228 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 229 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 230 | if (retval) |
7dc72b28 | 231 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 232 | "returned %d\n", dev_name(dev), |
2b3a302a | 233 | __func__, retval); |
f9f852df KS |
234 | } |
235 | ||
7eff2e7a | 236 | /* have the device type specific fuction add its stuff */ |
f9f852df | 237 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 238 | retval = dev->type->uevent(dev, env); |
f9f852df | 239 | if (retval) |
7dc72b28 | 240 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 241 | "returned %d\n", dev_name(dev), |
2b3a302a | 242 | __func__, retval); |
2620efef GKH |
243 | } |
244 | ||
1da177e4 LT |
245 | return retval; |
246 | } | |
247 | ||
312c004d KS |
248 | static struct kset_uevent_ops device_uevent_ops = { |
249 | .filter = dev_uevent_filter, | |
250 | .name = dev_uevent_name, | |
251 | .uevent = dev_uevent, | |
1da177e4 LT |
252 | }; |
253 | ||
16574dcc KS |
254 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
255 | char *buf) | |
256 | { | |
257 | struct kobject *top_kobj; | |
258 | struct kset *kset; | |
7eff2e7a | 259 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
260 | int i; |
261 | size_t count = 0; | |
262 | int retval; | |
263 | ||
264 | /* search the kset, the device belongs to */ | |
265 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
266 | while (!top_kobj->kset && top_kobj->parent) |
267 | top_kobj = top_kobj->parent; | |
16574dcc KS |
268 | if (!top_kobj->kset) |
269 | goto out; | |
5c5daf65 | 270 | |
16574dcc KS |
271 | kset = top_kobj->kset; |
272 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
273 | goto out; | |
274 | ||
275 | /* respect filter */ | |
276 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
277 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
278 | goto out; | |
279 | ||
7eff2e7a KS |
280 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
281 | if (!env) | |
c7308c81 GKH |
282 | return -ENOMEM; |
283 | ||
16574dcc | 284 | /* let the kset specific function add its keys */ |
7eff2e7a | 285 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
286 | if (retval) |
287 | goto out; | |
288 | ||
289 | /* copy keys to file */ | |
7eff2e7a KS |
290 | for (i = 0; i < env->envp_idx; i++) |
291 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 292 | out: |
7eff2e7a | 293 | kfree(env); |
16574dcc KS |
294 | return count; |
295 | } | |
296 | ||
a7fd6706 KS |
297 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
298 | const char *buf, size_t count) | |
299 | { | |
60a96a59 KS |
300 | enum kobject_action action; |
301 | ||
5c5daf65 | 302 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
303 | kobject_uevent(&dev->kobj, action); |
304 | goto out; | |
305 | } | |
306 | ||
307 | dev_err(dev, "uevent: unsupported action-string; this will " | |
308 | "be ignored in a future kernel version\n"); | |
312c004d | 309 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 310 | out: |
a7fd6706 KS |
311 | return count; |
312 | } | |
313 | ||
ad6a1e1c TH |
314 | static struct device_attribute uevent_attr = |
315 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
316 | ||
621a1672 DT |
317 | static int device_add_attributes(struct device *dev, |
318 | struct device_attribute *attrs) | |
de0ff00d | 319 | { |
621a1672 | 320 | int error = 0; |
de0ff00d | 321 | int i; |
621a1672 DT |
322 | |
323 | if (attrs) { | |
324 | for (i = 0; attr_name(attrs[i]); i++) { | |
325 | error = device_create_file(dev, &attrs[i]); | |
326 | if (error) | |
327 | break; | |
328 | } | |
329 | if (error) | |
330 | while (--i >= 0) | |
331 | device_remove_file(dev, &attrs[i]); | |
332 | } | |
333 | return error; | |
334 | } | |
335 | ||
336 | static void device_remove_attributes(struct device *dev, | |
337 | struct device_attribute *attrs) | |
338 | { | |
339 | int i; | |
340 | ||
341 | if (attrs) | |
342 | for (i = 0; attr_name(attrs[i]); i++) | |
343 | device_remove_file(dev, &attrs[i]); | |
344 | } | |
345 | ||
346 | static int device_add_groups(struct device *dev, | |
a4dbd674 | 347 | const struct attribute_group **groups) |
621a1672 | 348 | { |
de0ff00d | 349 | int error = 0; |
621a1672 | 350 | int i; |
de0ff00d | 351 | |
621a1672 DT |
352 | if (groups) { |
353 | for (i = 0; groups[i]; i++) { | |
354 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
355 | if (error) { |
356 | while (--i >= 0) | |
4a3ad20c GKH |
357 | sysfs_remove_group(&dev->kobj, |
358 | groups[i]); | |
621a1672 | 359 | break; |
de0ff00d GKH |
360 | } |
361 | } | |
362 | } | |
de0ff00d GKH |
363 | return error; |
364 | } | |
365 | ||
621a1672 | 366 | static void device_remove_groups(struct device *dev, |
a4dbd674 | 367 | const struct attribute_group **groups) |
de0ff00d GKH |
368 | { |
369 | int i; | |
621a1672 DT |
370 | |
371 | if (groups) | |
372 | for (i = 0; groups[i]; i++) | |
373 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
374 | } |
375 | ||
2620efef GKH |
376 | static int device_add_attrs(struct device *dev) |
377 | { | |
378 | struct class *class = dev->class; | |
f9f852df | 379 | struct device_type *type = dev->type; |
621a1672 | 380 | int error; |
2620efef | 381 | |
621a1672 DT |
382 | if (class) { |
383 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 384 | if (error) |
621a1672 | 385 | return error; |
2620efef | 386 | } |
f9f852df | 387 | |
621a1672 DT |
388 | if (type) { |
389 | error = device_add_groups(dev, type->groups); | |
f9f852df | 390 | if (error) |
621a1672 | 391 | goto err_remove_class_attrs; |
f9f852df KS |
392 | } |
393 | ||
621a1672 DT |
394 | error = device_add_groups(dev, dev->groups); |
395 | if (error) | |
396 | goto err_remove_type_groups; | |
397 | ||
398 | return 0; | |
399 | ||
400 | err_remove_type_groups: | |
401 | if (type) | |
402 | device_remove_groups(dev, type->groups); | |
403 | err_remove_class_attrs: | |
404 | if (class) | |
405 | device_remove_attributes(dev, class->dev_attrs); | |
406 | ||
2620efef GKH |
407 | return error; |
408 | } | |
409 | ||
410 | static void device_remove_attrs(struct device *dev) | |
411 | { | |
412 | struct class *class = dev->class; | |
f9f852df | 413 | struct device_type *type = dev->type; |
2620efef | 414 | |
621a1672 | 415 | device_remove_groups(dev, dev->groups); |
f9f852df | 416 | |
621a1672 DT |
417 | if (type) |
418 | device_remove_groups(dev, type->groups); | |
419 | ||
420 | if (class) | |
421 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
422 | } |
423 | ||
424 | ||
23681e47 GKH |
425 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
426 | char *buf) | |
427 | { | |
428 | return print_dev_t(buf, dev->devt); | |
429 | } | |
430 | ||
ad6a1e1c TH |
431 | static struct device_attribute devt_attr = |
432 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
433 | ||
881c6cfd GKH |
434 | /* kset to create /sys/devices/ */ |
435 | struct kset *devices_kset; | |
1da177e4 | 436 | |
1da177e4 | 437 | /** |
4a3ad20c GKH |
438 | * device_create_file - create sysfs attribute file for device. |
439 | * @dev: device. | |
440 | * @attr: device attribute descriptor. | |
1da177e4 | 441 | */ |
4a3ad20c | 442 | int device_create_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
443 | { |
444 | int error = 0; | |
0c98b19f | 445 | if (dev) |
1da177e4 | 446 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
447 | return error; |
448 | } | |
449 | ||
450 | /** | |
4a3ad20c GKH |
451 | * device_remove_file - remove sysfs attribute file. |
452 | * @dev: device. | |
453 | * @attr: device attribute descriptor. | |
1da177e4 | 454 | */ |
4a3ad20c | 455 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
1da177e4 | 456 | { |
0c98b19f | 457 | if (dev) |
1da177e4 | 458 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
459 | } |
460 | ||
2589f188 GKH |
461 | /** |
462 | * device_create_bin_file - create sysfs binary attribute file for device. | |
463 | * @dev: device. | |
464 | * @attr: device binary attribute descriptor. | |
465 | */ | |
466 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
467 | { | |
468 | int error = -EINVAL; | |
469 | if (dev) | |
470 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
471 | return error; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
474 | ||
475 | /** | |
476 | * device_remove_bin_file - remove sysfs binary attribute file | |
477 | * @dev: device. | |
478 | * @attr: device binary attribute descriptor. | |
479 | */ | |
480 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
481 | { | |
482 | if (dev) | |
483 | sysfs_remove_bin_file(&dev->kobj, attr); | |
484 | } | |
485 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
486 | ||
d9a9cdfb | 487 | /** |
523ded71 | 488 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
489 | * @dev: device. |
490 | * @func: callback function to invoke later. | |
523ded71 | 491 | * @owner: module owning the callback routine |
d9a9cdfb AS |
492 | * |
493 | * Attribute methods must not unregister themselves or their parent device | |
494 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
495 | * since unregistration is mutually exclusive with driver callbacks. | |
496 | * | |
497 | * Instead methods can call this routine, which will attempt to allocate | |
498 | * and schedule a workqueue request to call back @func with @dev as its | |
499 | * argument in the workqueue's process context. @dev will be pinned until | |
500 | * @func returns. | |
501 | * | |
523ded71 AS |
502 | * This routine is usually called via the inline device_schedule_callback(), |
503 | * which automatically sets @owner to THIS_MODULE. | |
504 | * | |
d9a9cdfb | 505 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 506 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
507 | * |
508 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
509 | * underlying sysfs routine (since it is intended for use by attribute | |
510 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
511 | */ | |
523ded71 AS |
512 | int device_schedule_callback_owner(struct device *dev, |
513 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
514 | { |
515 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 516 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 517 | } |
523ded71 | 518 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 519 | |
34bb61f9 JB |
520 | static void klist_children_get(struct klist_node *n) |
521 | { | |
f791b8c8 GKH |
522 | struct device_private *p = to_device_private_parent(n); |
523 | struct device *dev = p->device; | |
34bb61f9 JB |
524 | |
525 | get_device(dev); | |
526 | } | |
527 | ||
528 | static void klist_children_put(struct klist_node *n) | |
529 | { | |
f791b8c8 GKH |
530 | struct device_private *p = to_device_private_parent(n); |
531 | struct device *dev = p->device; | |
34bb61f9 JB |
532 | |
533 | put_device(dev); | |
534 | } | |
535 | ||
1da177e4 | 536 | /** |
4a3ad20c GKH |
537 | * device_initialize - init device structure. |
538 | * @dev: device. | |
1da177e4 | 539 | * |
5739411a CH |
540 | * This prepares the device for use by other layers by initializing |
541 | * its fields. | |
4a3ad20c | 542 | * It is the first half of device_register(), if called by |
5739411a CH |
543 | * that function, though it can also be called separately, so one |
544 | * may use @dev's fields. In particular, get_device()/put_device() | |
545 | * may be used for reference counting of @dev after calling this | |
546 | * function. | |
547 | * | |
548 | * NOTE: Use put_device() to give up your reference instead of freeing | |
549 | * @dev directly once you have called this function. | |
1da177e4 | 550 | */ |
1da177e4 LT |
551 | void device_initialize(struct device *dev) |
552 | { | |
881c6cfd | 553 | dev->kobj.kset = devices_kset; |
f9cb074b | 554 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 555 | INIT_LIST_HEAD(&dev->dma_pools); |
af70316a | 556 | init_MUTEX(&dev->sem); |
9ac7849e TH |
557 | spin_lock_init(&dev->devres_lock); |
558 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 559 | device_init_wakeup(dev, 0); |
3b98aeaf | 560 | device_pm_init(dev); |
87348136 | 561 | set_dev_node(dev, -1); |
1da177e4 LT |
562 | } |
563 | ||
40fa5422 | 564 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
565 | static struct kobject *get_device_parent(struct device *dev, |
566 | struct device *parent) | |
40fa5422 | 567 | { |
da231fd5 | 568 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 569 | if (dev->class && (!parent || parent->class != dev->class)) |
1fbfee6c | 570 | return &dev->class->p->class_subsys.kobj; |
da231fd5 | 571 | /* all other devices keep their parent */ |
40fa5422 | 572 | else if (parent) |
c744aeae | 573 | return &parent->kobj; |
40fa5422 | 574 | |
c744aeae | 575 | return NULL; |
40fa5422 | 576 | } |
da231fd5 KS |
577 | |
578 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
579 | static inline void cleanup_glue_dir(struct device *dev, |
580 | struct kobject *glue_dir) {} | |
40fa5422 | 581 | #else |
86406245 | 582 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 583 | { |
86406245 | 584 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 585 | |
86406245 | 586 | if (!virtual_dir) |
4ff6abff | 587 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 588 | &devices_kset->kobj); |
f0ee61a6 | 589 | |
86406245 | 590 | return virtual_dir; |
f0ee61a6 GKH |
591 | } |
592 | ||
da231fd5 KS |
593 | static struct kobject *get_device_parent(struct device *dev, |
594 | struct device *parent) | |
40fa5422 | 595 | { |
43968d2f GKH |
596 | int retval; |
597 | ||
86406245 KS |
598 | if (dev->class) { |
599 | struct kobject *kobj = NULL; | |
600 | struct kobject *parent_kobj; | |
601 | struct kobject *k; | |
602 | ||
603 | /* | |
604 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
605 | * Class-devices with a non class-device as parent, live |
606 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
607 | */ |
608 | if (parent == NULL) | |
609 | parent_kobj = virtual_device_parent(dev); | |
610 | else if (parent->class) | |
611 | return &parent->kobj; | |
612 | else | |
613 | parent_kobj = &parent->kobj; | |
614 | ||
615 | /* find our class-directory at the parent and reference it */ | |
7c71448b GKH |
616 | spin_lock(&dev->class->p->class_dirs.list_lock); |
617 | list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) | |
86406245 KS |
618 | if (k->parent == parent_kobj) { |
619 | kobj = kobject_get(k); | |
620 | break; | |
621 | } | |
7c71448b | 622 | spin_unlock(&dev->class->p->class_dirs.list_lock); |
86406245 KS |
623 | if (kobj) |
624 | return kobj; | |
625 | ||
626 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
627 | k = kobject_create(); |
628 | if (!k) | |
629 | return NULL; | |
7c71448b | 630 | k->kset = &dev->class->p->class_dirs; |
b2d6db58 | 631 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f GKH |
632 | if (retval < 0) { |
633 | kobject_put(k); | |
634 | return NULL; | |
635 | } | |
0f4dafc0 | 636 | /* do not emit an uevent for this simple "glue" directory */ |
43968d2f | 637 | return k; |
86406245 KS |
638 | } |
639 | ||
640 | if (parent) | |
c744aeae CH |
641 | return &parent->kobj; |
642 | return NULL; | |
643 | } | |
da231fd5 | 644 | |
63b6971a | 645 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 646 | { |
0f4dafc0 | 647 | /* see if we live in a "glue" directory */ |
c1fe539a | 648 | if (!glue_dir || !dev->class || |
7c71448b | 649 | glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5 KS |
650 | return; |
651 | ||
0f4dafc0 | 652 | kobject_put(glue_dir); |
da231fd5 | 653 | } |
63b6971a CH |
654 | |
655 | static void cleanup_device_parent(struct device *dev) | |
656 | { | |
657 | cleanup_glue_dir(dev, dev->kobj.parent); | |
658 | } | |
c744aeae | 659 | #endif |
86406245 | 660 | |
63b6971a | 661 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
662 | { |
663 | struct kobject *kobj; | |
664 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
665 | if (kobj) |
666 | dev->kobj.parent = kobj; | |
40fa5422 | 667 | } |
40fa5422 | 668 | |
2ee97caf CH |
669 | static int device_add_class_symlinks(struct device *dev) |
670 | { | |
671 | int error; | |
672 | ||
673 | if (!dev->class) | |
674 | return 0; | |
da231fd5 | 675 | |
1fbfee6c GKH |
676 | error = sysfs_create_link(&dev->kobj, |
677 | &dev->class->p->class_subsys.kobj, | |
2ee97caf CH |
678 | "subsystem"); |
679 | if (error) | |
680 | goto out; | |
da231fd5 KS |
681 | |
682 | #ifdef CONFIG_SYSFS_DEPRECATED | |
683 | /* stacked class devices need a symlink in the class directory */ | |
1fbfee6c | 684 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 685 | device_is_not_partition(dev)) { |
1fbfee6c | 686 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 687 | &dev->kobj, dev_name(dev)); |
2ee97caf CH |
688 | if (error) |
689 | goto out_subsys; | |
690 | } | |
da231fd5 | 691 | |
4e886c29 | 692 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
693 | struct device *parent = dev->parent; |
694 | char *class_name; | |
4f01a757 | 695 | |
da231fd5 KS |
696 | /* |
697 | * stacked class devices have the 'device' link | |
698 | * pointing to the bus device instead of the parent | |
699 | */ | |
700 | while (parent->class && !parent->bus && parent->parent) | |
701 | parent = parent->parent; | |
702 | ||
703 | error = sysfs_create_link(&dev->kobj, | |
704 | &parent->kobj, | |
4f01a757 DT |
705 | "device"); |
706 | if (error) | |
707 | goto out_busid; | |
da231fd5 KS |
708 | |
709 | class_name = make_class_name(dev->class->name, | |
710 | &dev->kobj); | |
711 | if (class_name) | |
712 | error = sysfs_create_link(&dev->parent->kobj, | |
713 | &dev->kobj, class_name); | |
714 | kfree(class_name); | |
715 | if (error) | |
716 | goto out_device; | |
2ee97caf CH |
717 | } |
718 | return 0; | |
719 | ||
2ee97caf | 720 | out_device: |
4e886c29 | 721 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 722 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 723 | out_busid: |
1fbfee6c | 724 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 725 | device_is_not_partition(dev)) |
1fbfee6c | 726 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 727 | dev_name(dev)); |
da231fd5 KS |
728 | #else |
729 | /* link in the class directory pointing to the device */ | |
1fbfee6c | 730 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 731 | &dev->kobj, dev_name(dev)); |
da231fd5 KS |
732 | if (error) |
733 | goto out_subsys; | |
734 | ||
4e886c29 | 735 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
736 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
737 | "device"); | |
738 | if (error) | |
739 | goto out_busid; | |
740 | } | |
741 | return 0; | |
742 | ||
743 | out_busid: | |
1e0b2cf9 | 744 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
745 | #endif |
746 | ||
2ee97caf CH |
747 | out_subsys: |
748 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
749 | out: | |
750 | return error; | |
751 | } | |
752 | ||
753 | static void device_remove_class_symlinks(struct device *dev) | |
754 | { | |
755 | if (!dev->class) | |
756 | return; | |
da231fd5 | 757 | |
2ee97caf | 758 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 759 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
760 | char *class_name; |
761 | ||
762 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
763 | if (class_name) { | |
764 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
765 | kfree(class_name); | |
766 | } | |
2ee97caf CH |
767 | sysfs_remove_link(&dev->kobj, "device"); |
768 | } | |
da231fd5 | 769 | |
1fbfee6c | 770 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 771 | device_is_not_partition(dev)) |
1fbfee6c | 772 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 773 | dev_name(dev)); |
da231fd5 | 774 | #else |
4e886c29 | 775 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
776 | sysfs_remove_link(&dev->kobj, "device"); |
777 | ||
1e0b2cf9 | 778 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
779 | #endif |
780 | ||
2ee97caf CH |
781 | sysfs_remove_link(&dev->kobj, "subsystem"); |
782 | } | |
783 | ||
413c239f SR |
784 | /** |
785 | * dev_set_name - set a device name | |
786 | * @dev: device | |
46232366 | 787 | * @fmt: format string for the device's name |
413c239f SR |
788 | */ |
789 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
790 | { | |
791 | va_list vargs; | |
1fa5ae85 | 792 | int err; |
413c239f SR |
793 | |
794 | va_start(vargs, fmt); | |
1fa5ae85 | 795 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 796 | va_end(vargs); |
1fa5ae85 | 797 | return err; |
413c239f SR |
798 | } |
799 | EXPORT_SYMBOL_GPL(dev_set_name); | |
800 | ||
e105b8bf DW |
801 | /** |
802 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
803 | * @dev: device | |
804 | * | |
805 | * By default we select char/ for new entries. Setting class->dev_obj | |
806 | * to NULL prevents an entry from being created. class->dev_kobj must | |
807 | * be set (or cleared) before any devices are registered to the class | |
808 | * otherwise device_create_sys_dev_entry() and | |
809 | * device_remove_sys_dev_entry() will disagree about the the presence | |
810 | * of the link. | |
811 | */ | |
812 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
813 | { | |
814 | struct kobject *kobj; | |
815 | ||
816 | if (dev->class) | |
817 | kobj = dev->class->dev_kobj; | |
818 | else | |
819 | kobj = sysfs_dev_char_kobj; | |
820 | ||
821 | return kobj; | |
822 | } | |
823 | ||
824 | static int device_create_sys_dev_entry(struct device *dev) | |
825 | { | |
826 | struct kobject *kobj = device_to_dev_kobj(dev); | |
827 | int error = 0; | |
828 | char devt_str[15]; | |
829 | ||
830 | if (kobj) { | |
831 | format_dev_t(devt_str, dev->devt); | |
832 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
833 | } | |
834 | ||
835 | return error; | |
836 | } | |
837 | ||
838 | static void device_remove_sys_dev_entry(struct device *dev) | |
839 | { | |
840 | struct kobject *kobj = device_to_dev_kobj(dev); | |
841 | char devt_str[15]; | |
842 | ||
843 | if (kobj) { | |
844 | format_dev_t(devt_str, dev->devt); | |
845 | sysfs_remove_link(kobj, devt_str); | |
846 | } | |
847 | } | |
848 | ||
b4028437 GKH |
849 | int device_private_init(struct device *dev) |
850 | { | |
851 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
852 | if (!dev->p) | |
853 | return -ENOMEM; | |
854 | dev->p->device = dev; | |
855 | klist_init(&dev->p->klist_children, klist_children_get, | |
856 | klist_children_put); | |
857 | return 0; | |
858 | } | |
859 | ||
1da177e4 | 860 | /** |
4a3ad20c GKH |
861 | * device_add - add device to device hierarchy. |
862 | * @dev: device. | |
1da177e4 | 863 | * |
4a3ad20c GKH |
864 | * This is part 2 of device_register(), though may be called |
865 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 866 | * |
5739411a | 867 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
868 | * to the global and sibling lists for the device, then |
869 | * adds it to the other relevant subsystems of the driver model. | |
5739411a CH |
870 | * |
871 | * NOTE: _Never_ directly free @dev after calling this function, even | |
872 | * if it returned an error! Always use put_device() to give up your | |
873 | * reference instead. | |
1da177e4 LT |
874 | */ |
875 | int device_add(struct device *dev) | |
876 | { | |
877 | struct device *parent = NULL; | |
c47ed219 | 878 | struct class_interface *class_intf; |
c906a48a | 879 | int error = -EINVAL; |
775b64d2 | 880 | |
1da177e4 | 881 | dev = get_device(dev); |
c906a48a GKH |
882 | if (!dev) |
883 | goto done; | |
884 | ||
fb069a5d | 885 | if (!dev->p) { |
b4028437 GKH |
886 | error = device_private_init(dev); |
887 | if (error) | |
888 | goto done; | |
fb069a5d | 889 | } |
fb069a5d | 890 | |
1fa5ae85 KS |
891 | /* |
892 | * for statically allocated devices, which should all be converted | |
893 | * some day, we need to initialize the name. We prevent reading back | |
894 | * the name, and force the use of dev_name() | |
895 | */ | |
896 | if (dev->init_name) { | |
acc0e90f | 897 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
898 | dev->init_name = NULL; |
899 | } | |
c906a48a | 900 | |
1fa5ae85 | 901 | if (!dev_name(dev)) |
5c8563d7 | 902 | goto name_error; |
1da177e4 | 903 | |
1e0b2cf9 | 904 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 905 | |
1da177e4 | 906 | parent = get_device(dev->parent); |
63b6971a | 907 | setup_parent(dev, parent); |
1da177e4 | 908 | |
0d358f22 YL |
909 | /* use parent numa_node */ |
910 | if (parent) | |
911 | set_dev_node(dev, dev_to_node(parent)); | |
912 | ||
1da177e4 | 913 | /* first, register with generic layer. */ |
8a577ffc KS |
914 | /* we require the name to be set before, and pass NULL */ |
915 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 916 | if (error) |
1da177e4 | 917 | goto Error; |
a7fd6706 | 918 | |
37022644 BW |
919 | /* notify platform of device entry */ |
920 | if (platform_notify) | |
921 | platform_notify(dev); | |
922 | ||
ad6a1e1c | 923 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
924 | if (error) |
925 | goto attrError; | |
a7fd6706 | 926 | |
23681e47 | 927 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
928 | error = device_create_file(dev, &devt_attr); |
929 | if (error) | |
a306eea4 | 930 | goto ueventattrError; |
e105b8bf DW |
931 | |
932 | error = device_create_sys_dev_entry(dev); | |
933 | if (error) | |
934 | goto devtattrError; | |
2b2af54a KS |
935 | |
936 | devtmpfs_create_node(dev); | |
23681e47 GKH |
937 | } |
938 | ||
2ee97caf CH |
939 | error = device_add_class_symlinks(dev); |
940 | if (error) | |
941 | goto SymlinkError; | |
dc0afa83 CH |
942 | error = device_add_attrs(dev); |
943 | if (error) | |
2620efef | 944 | goto AttrsError; |
dc0afa83 CH |
945 | error = bus_add_device(dev); |
946 | if (error) | |
1da177e4 | 947 | goto BusError; |
3b98aeaf | 948 | error = dpm_sysfs_add(dev); |
57eee3d2 | 949 | if (error) |
3b98aeaf AS |
950 | goto DPMError; |
951 | device_pm_add(dev); | |
ec0676ee AS |
952 | |
953 | /* Notify clients of device addition. This call must come | |
954 | * after dpm_sysf_add() and before kobject_uevent(). | |
955 | */ | |
956 | if (dev->bus) | |
957 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
958 | BUS_NOTIFY_ADD_DEVICE, dev); | |
959 | ||
83b5fb4c | 960 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 961 | bus_probe_device(dev); |
1da177e4 | 962 | if (parent) |
f791b8c8 GKH |
963 | klist_add_tail(&dev->p->knode_parent, |
964 | &parent->p->klist_children); | |
1da177e4 | 965 | |
5d9fd169 | 966 | if (dev->class) { |
f75b1c60 | 967 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 968 | /* tie the class to the device */ |
5a3ceb86 TH |
969 | klist_add_tail(&dev->knode_class, |
970 | &dev->class->p->class_devices); | |
c47ed219 GKH |
971 | |
972 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
973 | list_for_each_entry(class_intf, |
974 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
975 | if (class_intf->add_dev) |
976 | class_intf->add_dev(dev, class_intf); | |
f75b1c60 | 977 | mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169 | 978 | } |
c906a48a | 979 | done: |
1da177e4 LT |
980 | put_device(dev); |
981 | return error; | |
3b98aeaf | 982 | DPMError: |
57eee3d2 RW |
983 | bus_remove_device(dev); |
984 | BusError: | |
82f0cf9b | 985 | device_remove_attrs(dev); |
2620efef | 986 | AttrsError: |
2ee97caf CH |
987 | device_remove_class_symlinks(dev); |
988 | SymlinkError: | |
e105b8bf DW |
989 | if (MAJOR(dev->devt)) |
990 | device_remove_sys_dev_entry(dev); | |
991 | devtattrError: | |
ad6a1e1c TH |
992 | if (MAJOR(dev->devt)) |
993 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 994 | ueventattrError: |
ad6a1e1c | 995 | device_remove_file(dev, &uevent_attr); |
23681e47 | 996 | attrError: |
312c004d | 997 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
998 | kobject_del(&dev->kobj); |
999 | Error: | |
63b6971a | 1000 | cleanup_device_parent(dev); |
1da177e4 LT |
1001 | if (parent) |
1002 | put_device(parent); | |
5c8563d7 KS |
1003 | name_error: |
1004 | kfree(dev->p); | |
1005 | dev->p = NULL; | |
c906a48a | 1006 | goto done; |
1da177e4 LT |
1007 | } |
1008 | ||
1da177e4 | 1009 | /** |
4a3ad20c GKH |
1010 | * device_register - register a device with the system. |
1011 | * @dev: pointer to the device structure | |
1da177e4 | 1012 | * |
4a3ad20c GKH |
1013 | * This happens in two clean steps - initialize the device |
1014 | * and add it to the system. The two steps can be called | |
1015 | * separately, but this is the easiest and most common. | |
1016 | * I.e. you should only call the two helpers separately if | |
1017 | * have a clearly defined need to use and refcount the device | |
1018 | * before it is added to the hierarchy. | |
5739411a CH |
1019 | * |
1020 | * NOTE: _Never_ directly free @dev after calling this function, even | |
1021 | * if it returned an error! Always use put_device() to give up the | |
1022 | * reference initialized in this function instead. | |
1da177e4 | 1023 | */ |
1da177e4 LT |
1024 | int device_register(struct device *dev) |
1025 | { | |
1026 | device_initialize(dev); | |
1027 | return device_add(dev); | |
1028 | } | |
1029 | ||
1da177e4 | 1030 | /** |
4a3ad20c GKH |
1031 | * get_device - increment reference count for device. |
1032 | * @dev: device. | |
1da177e4 | 1033 | * |
4a3ad20c GKH |
1034 | * This simply forwards the call to kobject_get(), though |
1035 | * we do take care to provide for the case that we get a NULL | |
1036 | * pointer passed in. | |
1da177e4 | 1037 | */ |
4a3ad20c | 1038 | struct device *get_device(struct device *dev) |
1da177e4 LT |
1039 | { |
1040 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
1041 | } | |
1042 | ||
1da177e4 | 1043 | /** |
4a3ad20c GKH |
1044 | * put_device - decrement reference count. |
1045 | * @dev: device in question. | |
1da177e4 | 1046 | */ |
4a3ad20c | 1047 | void put_device(struct device *dev) |
1da177e4 | 1048 | { |
edfaa7c3 | 1049 | /* might_sleep(); */ |
1da177e4 LT |
1050 | if (dev) |
1051 | kobject_put(&dev->kobj); | |
1052 | } | |
1053 | ||
1da177e4 | 1054 | /** |
4a3ad20c GKH |
1055 | * device_del - delete device from system. |
1056 | * @dev: device. | |
1da177e4 | 1057 | * |
4a3ad20c GKH |
1058 | * This is the first part of the device unregistration |
1059 | * sequence. This removes the device from the lists we control | |
1060 | * from here, has it removed from the other driver model | |
1061 | * subsystems it was added to in device_add(), and removes it | |
1062 | * from the kobject hierarchy. | |
1da177e4 | 1063 | * |
4a3ad20c GKH |
1064 | * NOTE: this should be called manually _iff_ device_add() was |
1065 | * also called manually. | |
1da177e4 | 1066 | */ |
4a3ad20c | 1067 | void device_del(struct device *dev) |
1da177e4 | 1068 | { |
4a3ad20c | 1069 | struct device *parent = dev->parent; |
c47ed219 | 1070 | struct class_interface *class_intf; |
1da177e4 | 1071 | |
ec0676ee AS |
1072 | /* Notify clients of device removal. This call must come |
1073 | * before dpm_sysfs_remove(). | |
1074 | */ | |
1075 | if (dev->bus) | |
1076 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1077 | BUS_NOTIFY_DEL_DEVICE, dev); | |
775b64d2 | 1078 | device_pm_remove(dev); |
3b98aeaf | 1079 | dpm_sysfs_remove(dev); |
1da177e4 | 1080 | if (parent) |
f791b8c8 | 1081 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1082 | if (MAJOR(dev->devt)) { |
2b2af54a | 1083 | devtmpfs_delete_node(dev); |
e105b8bf | 1084 | device_remove_sys_dev_entry(dev); |
ad6a1e1c | 1085 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1086 | } |
b9d9c82b | 1087 | if (dev->class) { |
da231fd5 | 1088 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1089 | |
f75b1c60 | 1090 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 1091 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1092 | list_for_each_entry(class_intf, |
1093 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1094 | if (class_intf->remove_dev) |
1095 | class_intf->remove_dev(dev, class_intf); | |
1096 | /* remove the device from the class list */ | |
5a3ceb86 | 1097 | klist_del(&dev->knode_class); |
f75b1c60 | 1098 | mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b | 1099 | } |
ad6a1e1c | 1100 | device_remove_file(dev, &uevent_attr); |
2620efef | 1101 | device_remove_attrs(dev); |
28953533 | 1102 | bus_remove_device(dev); |
1da177e4 | 1103 | |
2f8d16a9 TH |
1104 | /* |
1105 | * Some platform devices are driven without driver attached | |
1106 | * and managed resources may have been acquired. Make sure | |
1107 | * all resources are released. | |
1108 | */ | |
1109 | devres_release_all(dev); | |
1110 | ||
1da177e4 LT |
1111 | /* Notify the platform of the removal, in case they |
1112 | * need to do anything... | |
1113 | */ | |
1114 | if (platform_notify_remove) | |
1115 | platform_notify_remove(dev); | |
312c004d | 1116 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1117 | cleanup_device_parent(dev); |
1da177e4 | 1118 | kobject_del(&dev->kobj); |
da231fd5 | 1119 | put_device(parent); |
1da177e4 LT |
1120 | } |
1121 | ||
1122 | /** | |
4a3ad20c GKH |
1123 | * device_unregister - unregister device from system. |
1124 | * @dev: device going away. | |
1da177e4 | 1125 | * |
4a3ad20c GKH |
1126 | * We do this in two parts, like we do device_register(). First, |
1127 | * we remove it from all the subsystems with device_del(), then | |
1128 | * we decrement the reference count via put_device(). If that | |
1129 | * is the final reference count, the device will be cleaned up | |
1130 | * via device_release() above. Otherwise, the structure will | |
1131 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1132 | */ |
4a3ad20c | 1133 | void device_unregister(struct device *dev) |
1da177e4 | 1134 | { |
1e0b2cf9 | 1135 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1136 | device_del(dev); |
1137 | put_device(dev); | |
1138 | } | |
1139 | ||
4a3ad20c | 1140 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1141 | { |
4a3ad20c | 1142 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1143 | struct device *dev = NULL; |
1144 | struct device_private *p; | |
1145 | ||
1146 | if (n) { | |
1147 | p = to_device_private_parent(n); | |
1148 | dev = p->device; | |
1149 | } | |
1150 | return dev; | |
36239577 | 1151 | } |
1152 | ||
6fcf53ac | 1153 | /** |
e454cea2 | 1154 | * device_get_devnode - path of device node file |
6fcf53ac | 1155 | * @dev: device |
e454cea2 | 1156 | * @mode: returned file access mode |
6fcf53ac KS |
1157 | * @tmp: possibly allocated string |
1158 | * | |
1159 | * Return the relative path of a possible device node. | |
1160 | * Non-default names may need to allocate a memory to compose | |
1161 | * a name. This memory is returned in tmp and needs to be | |
1162 | * freed by the caller. | |
1163 | */ | |
e454cea2 KS |
1164 | const char *device_get_devnode(struct device *dev, |
1165 | mode_t *mode, const char **tmp) | |
6fcf53ac KS |
1166 | { |
1167 | char *s; | |
1168 | ||
1169 | *tmp = NULL; | |
1170 | ||
1171 | /* the device type may provide a specific name */ | |
e454cea2 KS |
1172 | if (dev->type && dev->type->devnode) |
1173 | *tmp = dev->type->devnode(dev, mode); | |
6fcf53ac KS |
1174 | if (*tmp) |
1175 | return *tmp; | |
1176 | ||
1177 | /* the class may provide a specific name */ | |
e454cea2 KS |
1178 | if (dev->class && dev->class->devnode) |
1179 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1180 | if (*tmp) |
1181 | return *tmp; | |
1182 | ||
1183 | /* return name without allocation, tmp == NULL */ | |
1184 | if (strchr(dev_name(dev), '!') == NULL) | |
1185 | return dev_name(dev); | |
1186 | ||
1187 | /* replace '!' in the name with '/' */ | |
1188 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1189 | if (!*tmp) | |
1190 | return NULL; | |
1191 | while ((s = strchr(*tmp, '!'))) | |
1192 | s[0] = '/'; | |
1193 | return *tmp; | |
1194 | } | |
1195 | ||
1da177e4 | 1196 | /** |
4a3ad20c GKH |
1197 | * device_for_each_child - device child iterator. |
1198 | * @parent: parent struct device. | |
1199 | * @data: data for the callback. | |
1200 | * @fn: function to be called for each device. | |
1da177e4 | 1201 | * |
4a3ad20c GKH |
1202 | * Iterate over @parent's child devices, and call @fn for each, |
1203 | * passing it @data. | |
1da177e4 | 1204 | * |
4a3ad20c GKH |
1205 | * We check the return of @fn each time. If it returns anything |
1206 | * other than 0, we break out and return that value. | |
1da177e4 | 1207 | */ |
4a3ad20c GKH |
1208 | int device_for_each_child(struct device *parent, void *data, |
1209 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1210 | { |
36239577 | 1211 | struct klist_iter i; |
4a3ad20c | 1212 | struct device *child; |
1da177e4 LT |
1213 | int error = 0; |
1214 | ||
014c90db GKH |
1215 | if (!parent->p) |
1216 | return 0; | |
1217 | ||
f791b8c8 | 1218 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 | 1219 | while ((child = next_device(&i)) && !error) |
1220 | error = fn(child, data); | |
1221 | klist_iter_exit(&i); | |
1da177e4 LT |
1222 | return error; |
1223 | } | |
1224 | ||
5ab69981 CH |
1225 | /** |
1226 | * device_find_child - device iterator for locating a particular device. | |
1227 | * @parent: parent struct device | |
1228 | * @data: Data to pass to match function | |
1229 | * @match: Callback function to check device | |
1230 | * | |
1231 | * This is similar to the device_for_each_child() function above, but it | |
1232 | * returns a reference to a device that is 'found' for later use, as | |
1233 | * determined by the @match callback. | |
1234 | * | |
1235 | * The callback should return 0 if the device doesn't match and non-zero | |
1236 | * if it does. If the callback returns non-zero and a reference to the | |
1237 | * current device can be obtained, this function will return to the caller | |
1238 | * and not iterate over any more devices. | |
1239 | */ | |
4a3ad20c GKH |
1240 | struct device *device_find_child(struct device *parent, void *data, |
1241 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1242 | { |
1243 | struct klist_iter i; | |
1244 | struct device *child; | |
1245 | ||
1246 | if (!parent) | |
1247 | return NULL; | |
1248 | ||
f791b8c8 | 1249 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1250 | while ((child = next_device(&i))) |
1251 | if (match(child, data) && get_device(child)) | |
1252 | break; | |
1253 | klist_iter_exit(&i); | |
1254 | return child; | |
1255 | } | |
1256 | ||
1da177e4 LT |
1257 | int __init devices_init(void) |
1258 | { | |
881c6cfd GKH |
1259 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1260 | if (!devices_kset) | |
1261 | return -ENOMEM; | |
e105b8bf DW |
1262 | dev_kobj = kobject_create_and_add("dev", NULL); |
1263 | if (!dev_kobj) | |
1264 | goto dev_kobj_err; | |
1265 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1266 | if (!sysfs_dev_block_kobj) | |
1267 | goto block_kobj_err; | |
1268 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1269 | if (!sysfs_dev_char_kobj) | |
1270 | goto char_kobj_err; | |
1271 | ||
881c6cfd | 1272 | return 0; |
e105b8bf DW |
1273 | |
1274 | char_kobj_err: | |
1275 | kobject_put(sysfs_dev_block_kobj); | |
1276 | block_kobj_err: | |
1277 | kobject_put(dev_kobj); | |
1278 | dev_kobj_err: | |
1279 | kset_unregister(devices_kset); | |
1280 | return -ENOMEM; | |
1da177e4 LT |
1281 | } |
1282 | ||
1283 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1284 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1285 | |
1286 | EXPORT_SYMBOL_GPL(device_initialize); | |
1287 | EXPORT_SYMBOL_GPL(device_add); | |
1288 | EXPORT_SYMBOL_GPL(device_register); | |
1289 | ||
1290 | EXPORT_SYMBOL_GPL(device_del); | |
1291 | EXPORT_SYMBOL_GPL(device_unregister); | |
1292 | EXPORT_SYMBOL_GPL(get_device); | |
1293 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1294 | |
1295 | EXPORT_SYMBOL_GPL(device_create_file); | |
1296 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 | 1297 | |
0aa0dc41 MM |
1298 | struct root_device |
1299 | { | |
1300 | struct device dev; | |
1301 | struct module *owner; | |
1302 | }; | |
1303 | ||
1304 | #define to_root_device(dev) container_of(dev, struct root_device, dev) | |
1305 | ||
1306 | static void root_device_release(struct device *dev) | |
1307 | { | |
1308 | kfree(to_root_device(dev)); | |
1309 | } | |
1310 | ||
1311 | /** | |
1312 | * __root_device_register - allocate and register a root device | |
1313 | * @name: root device name | |
1314 | * @owner: owner module of the root device, usually THIS_MODULE | |
1315 | * | |
1316 | * This function allocates a root device and registers it | |
1317 | * using device_register(). In order to free the returned | |
1318 | * device, use root_device_unregister(). | |
1319 | * | |
1320 | * Root devices are dummy devices which allow other devices | |
1321 | * to be grouped under /sys/devices. Use this function to | |
1322 | * allocate a root device and then use it as the parent of | |
1323 | * any device which should appear under /sys/devices/{name} | |
1324 | * | |
1325 | * The /sys/devices/{name} directory will also contain a | |
1326 | * 'module' symlink which points to the @owner directory | |
1327 | * in sysfs. | |
1328 | * | |
1329 | * Note: You probably want to use root_device_register(). | |
1330 | */ | |
1331 | struct device *__root_device_register(const char *name, struct module *owner) | |
1332 | { | |
1333 | struct root_device *root; | |
1334 | int err = -ENOMEM; | |
1335 | ||
1336 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1337 | if (!root) | |
1338 | return ERR_PTR(err); | |
1339 | ||
acc0e90f | 1340 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1341 | if (err) { |
1342 | kfree(root); | |
1343 | return ERR_PTR(err); | |
1344 | } | |
1345 | ||
1346 | root->dev.release = root_device_release; | |
1347 | ||
1348 | err = device_register(&root->dev); | |
1349 | if (err) { | |
1350 | put_device(&root->dev); | |
1351 | return ERR_PTR(err); | |
1352 | } | |
1353 | ||
1354 | #ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */ | |
1355 | if (owner) { | |
1356 | struct module_kobject *mk = &owner->mkobj; | |
1357 | ||
1358 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1359 | if (err) { | |
1360 | device_unregister(&root->dev); | |
1361 | return ERR_PTR(err); | |
1362 | } | |
1363 | root->owner = owner; | |
1364 | } | |
1365 | #endif | |
1366 | ||
1367 | return &root->dev; | |
1368 | } | |
1369 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1370 | ||
1371 | /** | |
1372 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1373 | * @dev: device going away |
0aa0dc41 MM |
1374 | * |
1375 | * This function unregisters and cleans up a device that was created by | |
1376 | * root_device_register(). | |
1377 | */ | |
1378 | void root_device_unregister(struct device *dev) | |
1379 | { | |
1380 | struct root_device *root = to_root_device(dev); | |
1381 | ||
1382 | if (root->owner) | |
1383 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1384 | ||
1385 | device_unregister(dev); | |
1386 | } | |
1387 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1388 | ||
23681e47 GKH |
1389 | |
1390 | static void device_create_release(struct device *dev) | |
1391 | { | |
1e0b2cf9 | 1392 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1393 | kfree(dev); |
1394 | } | |
1395 | ||
1396 | /** | |
8882b394 | 1397 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1398 | * @class: pointer to the struct class that this device should be registered to |
1399 | * @parent: pointer to the parent struct device of this new device, if any | |
1400 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1401 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1402 | * @fmt: string for the device's name |
8882b394 | 1403 | * @args: va_list for the device's name |
42734daf HK |
1404 | * |
1405 | * This function can be used by char device classes. A struct device | |
1406 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1407 | * |
23681e47 GKH |
1408 | * A "dev" file will be created, showing the dev_t for the device, if |
1409 | * the dev_t is not 0,0. | |
42734daf HK |
1410 | * If a pointer to a parent struct device is passed in, the newly created |
1411 | * struct device will be a child of that device in sysfs. | |
1412 | * The pointer to the struct device will be returned from the call. | |
1413 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1414 | * pointer. |
1415 | * | |
1416 | * Note: the struct class passed to this function must have previously | |
1417 | * been created with a call to class_create(). | |
1418 | */ | |
8882b394 GKH |
1419 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1420 | dev_t devt, void *drvdata, const char *fmt, | |
1421 | va_list args) | |
23681e47 | 1422 | { |
23681e47 GKH |
1423 | struct device *dev = NULL; |
1424 | int retval = -ENODEV; | |
1425 | ||
1426 | if (class == NULL || IS_ERR(class)) | |
1427 | goto error; | |
23681e47 GKH |
1428 | |
1429 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1430 | if (!dev) { | |
1431 | retval = -ENOMEM; | |
1432 | goto error; | |
1433 | } | |
1434 | ||
1435 | dev->devt = devt; | |
1436 | dev->class = class; | |
1437 | dev->parent = parent; | |
1438 | dev->release = device_create_release; | |
8882b394 | 1439 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1440 | |
1fa5ae85 KS |
1441 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1442 | if (retval) | |
1443 | goto error; | |
1444 | ||
23681e47 GKH |
1445 | retval = device_register(dev); |
1446 | if (retval) | |
1447 | goto error; | |
1448 | ||
23681e47 GKH |
1449 | return dev; |
1450 | ||
1451 | error: | |
286661b3 | 1452 | put_device(dev); |
23681e47 GKH |
1453 | return ERR_PTR(retval); |
1454 | } | |
8882b394 GKH |
1455 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1456 | ||
1457 | /** | |
4e106739 | 1458 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1459 | * @class: pointer to the struct class that this device should be registered to |
1460 | * @parent: pointer to the parent struct device of this new device, if any | |
1461 | * @devt: the dev_t for the char device to be added | |
1462 | * @drvdata: the data to be added to the device for callbacks | |
1463 | * @fmt: string for the device's name | |
1464 | * | |
1465 | * This function can be used by char device classes. A struct device | |
1466 | * will be created in sysfs, registered to the specified class. | |
1467 | * | |
1468 | * A "dev" file will be created, showing the dev_t for the device, if | |
1469 | * the dev_t is not 0,0. | |
1470 | * If a pointer to a parent struct device is passed in, the newly created | |
1471 | * struct device will be a child of that device in sysfs. | |
1472 | * The pointer to the struct device will be returned from the call. | |
1473 | * Any further sysfs files that might be required can be created using this | |
1474 | * pointer. | |
1475 | * | |
1476 | * Note: the struct class passed to this function must have previously | |
1477 | * been created with a call to class_create(). | |
1478 | */ | |
4e106739 GKH |
1479 | struct device *device_create(struct class *class, struct device *parent, |
1480 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1481 | { |
1482 | va_list vargs; | |
1483 | struct device *dev; | |
1484 | ||
1485 | va_start(vargs, fmt); | |
1486 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1487 | va_end(vargs); | |
1488 | return dev; | |
1489 | } | |
4e106739 | 1490 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1491 | |
cd35449b | 1492 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1493 | { |
cd35449b | 1494 | dev_t *devt = data; |
23681e47 | 1495 | |
cd35449b | 1496 | return dev->devt == *devt; |
775b64d2 RW |
1497 | } |
1498 | ||
1499 | /** | |
1500 | * device_destroy - removes a device that was created with device_create() | |
1501 | * @class: pointer to the struct class that this device was registered with | |
1502 | * @devt: the dev_t of the device that was previously registered | |
1503 | * | |
1504 | * This call unregisters and cleans up a device that was created with a | |
1505 | * call to device_create(). | |
1506 | */ | |
1507 | void device_destroy(struct class *class, dev_t devt) | |
1508 | { | |
1509 | struct device *dev; | |
23681e47 | 1510 | |
695794ae | 1511 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1512 | if (dev) { |
1513 | put_device(dev); | |
23681e47 | 1514 | device_unregister(dev); |
cd35449b | 1515 | } |
23681e47 GKH |
1516 | } |
1517 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1518 | |
1519 | /** | |
1520 | * device_rename - renames a device | |
1521 | * @dev: the pointer to the struct device to be renamed | |
1522 | * @new_name: the new name of the device | |
030c1d2b EB |
1523 | * |
1524 | * It is the responsibility of the caller to provide mutual | |
1525 | * exclusion between two different calls of device_rename | |
1526 | * on the same device to ensure that new_name is valid and | |
1527 | * won't conflict with other devices. | |
a2de48ca GKH |
1528 | */ |
1529 | int device_rename(struct device *dev, char *new_name) | |
1530 | { | |
1531 | char *old_class_name = NULL; | |
1532 | char *new_class_name = NULL; | |
2ee97caf | 1533 | char *old_device_name = NULL; |
a2de48ca GKH |
1534 | int error; |
1535 | ||
1536 | dev = get_device(dev); | |
1537 | if (!dev) | |
1538 | return -EINVAL; | |
1539 | ||
1e0b2cf9 | 1540 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1541 | __func__, new_name); |
a2de48ca | 1542 | |
99ef3ef8 | 1543 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1544 | if ((dev->class) && (dev->parent)) |
1545 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1546 | #endif |
a2de48ca | 1547 | |
1fa5ae85 | 1548 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1549 | if (!old_device_name) { |
1550 | error = -ENOMEM; | |
1551 | goto out; | |
a2de48ca | 1552 | } |
a2de48ca GKH |
1553 | |
1554 | error = kobject_rename(&dev->kobj, new_name); | |
1fa5ae85 | 1555 | if (error) |
2ee97caf | 1556 | goto out; |
a2de48ca | 1557 | |
99ef3ef8 | 1558 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1559 | if (old_class_name) { |
1560 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1561 | if (new_class_name) { | |
36ce6dad CH |
1562 | error = sysfs_create_link_nowarn(&dev->parent->kobj, |
1563 | &dev->kobj, | |
1564 | new_class_name); | |
2ee97caf CH |
1565 | if (error) |
1566 | goto out; | |
a2de48ca GKH |
1567 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1568 | } | |
1569 | } | |
60b8cabd | 1570 | #else |
a2de48ca | 1571 | if (dev->class) { |
36ce6dad | 1572 | error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 1573 | &dev->kobj, dev_name(dev)); |
0599ad53 SH |
1574 | if (error) |
1575 | goto out; | |
1fbfee6c | 1576 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
7c71448b | 1577 | old_device_name); |
a2de48ca | 1578 | } |
60b8cabd KS |
1579 | #endif |
1580 | ||
2ee97caf | 1581 | out: |
a2de48ca GKH |
1582 | put_device(dev); |
1583 | ||
a2de48ca | 1584 | kfree(new_class_name); |
952ab431 | 1585 | kfree(old_class_name); |
2ee97caf | 1586 | kfree(old_device_name); |
a2de48ca GKH |
1587 | |
1588 | return error; | |
1589 | } | |
a2807dbc | 1590 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1591 | |
1592 | static int device_move_class_links(struct device *dev, | |
1593 | struct device *old_parent, | |
1594 | struct device *new_parent) | |
1595 | { | |
f7f3461d | 1596 | int error = 0; |
8a82472f | 1597 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1598 | char *class_name; |
1599 | ||
1600 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1601 | if (!class_name) { | |
cb360bbf | 1602 | error = -ENOMEM; |
8a82472f CH |
1603 | goto out; |
1604 | } | |
1605 | if (old_parent) { | |
1606 | sysfs_remove_link(&dev->kobj, "device"); | |
1607 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1608 | } | |
c744aeae CH |
1609 | if (new_parent) { |
1610 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1611 | "device"); | |
1612 | if (error) | |
1613 | goto out; | |
1614 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1615 | class_name); | |
1616 | if (error) | |
1617 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1618 | } else |
c744aeae | 1619 | error = 0; |
8a82472f CH |
1620 | out: |
1621 | kfree(class_name); | |
1622 | return error; | |
1623 | #else | |
f7f3461d GKH |
1624 | if (old_parent) |
1625 | sysfs_remove_link(&dev->kobj, "device"); | |
1626 | if (new_parent) | |
1627 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1628 | "device"); | |
1629 | return error; | |
8a82472f CH |
1630 | #endif |
1631 | } | |
1632 | ||
1633 | /** | |
1634 | * device_move - moves a device to a new parent | |
1635 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1636 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1637 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1638 | */ |
ffa6a705 CH |
1639 | int device_move(struct device *dev, struct device *new_parent, |
1640 | enum dpm_order dpm_order) | |
8a82472f CH |
1641 | { |
1642 | int error; | |
1643 | struct device *old_parent; | |
c744aeae | 1644 | struct kobject *new_parent_kobj; |
8a82472f CH |
1645 | |
1646 | dev = get_device(dev); | |
1647 | if (!dev) | |
1648 | return -EINVAL; | |
1649 | ||
ffa6a705 | 1650 | device_pm_lock(); |
8a82472f | 1651 | new_parent = get_device(new_parent); |
4a3ad20c | 1652 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1653 | |
1e0b2cf9 KS |
1654 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1655 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1656 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1657 | if (error) { |
63b6971a | 1658 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1659 | put_device(new_parent); |
1660 | goto out; | |
1661 | } | |
1662 | old_parent = dev->parent; | |
1663 | dev->parent = new_parent; | |
1664 | if (old_parent) | |
f791b8c8 | 1665 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1666 | if (new_parent) { |
f791b8c8 GKH |
1667 | klist_add_tail(&dev->p->knode_parent, |
1668 | &new_parent->p->klist_children); | |
0d358f22 YL |
1669 | set_dev_node(dev, dev_to_node(new_parent)); |
1670 | } | |
1671 | ||
8a82472f CH |
1672 | if (!dev->class) |
1673 | goto out_put; | |
1674 | error = device_move_class_links(dev, old_parent, new_parent); | |
1675 | if (error) { | |
1676 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1677 | device_move_class_links(dev, new_parent, old_parent); | |
1678 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae | 1679 | if (new_parent) |
f791b8c8 | 1680 | klist_remove(&dev->p->knode_parent); |
0d358f22 YL |
1681 | dev->parent = old_parent; |
1682 | if (old_parent) { | |
f791b8c8 GKH |
1683 | klist_add_tail(&dev->p->knode_parent, |
1684 | &old_parent->p->klist_children); | |
0d358f22 YL |
1685 | set_dev_node(dev, dev_to_node(old_parent)); |
1686 | } | |
8a82472f | 1687 | } |
63b6971a | 1688 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1689 | put_device(new_parent); |
1690 | goto out; | |
1691 | } | |
ffa6a705 CH |
1692 | switch (dpm_order) { |
1693 | case DPM_ORDER_NONE: | |
1694 | break; | |
1695 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1696 | device_pm_move_after(dev, new_parent); | |
1697 | break; | |
1698 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1699 | device_pm_move_before(new_parent, dev); | |
1700 | break; | |
1701 | case DPM_ORDER_DEV_LAST: | |
1702 | device_pm_move_last(dev); | |
1703 | break; | |
1704 | } | |
8a82472f CH |
1705 | out_put: |
1706 | put_device(old_parent); | |
1707 | out: | |
ffa6a705 | 1708 | device_pm_unlock(); |
8a82472f CH |
1709 | put_device(dev); |
1710 | return error; | |
1711 | } | |
8a82472f | 1712 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1713 | |
1714 | /** | |
1715 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1716 | */ | |
1717 | void device_shutdown(void) | |
1718 | { | |
4a3ad20c | 1719 | struct device *dev, *devn; |
37b0c020 GKH |
1720 | |
1721 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1722 | kobj.entry) { | |
1723 | if (dev->bus && dev->bus->shutdown) { | |
1724 | dev_dbg(dev, "shutdown\n"); | |
1725 | dev->bus->shutdown(dev); | |
1726 | } else if (dev->driver && dev->driver->shutdown) { | |
1727 | dev_dbg(dev, "shutdown\n"); | |
1728 | dev->driver->shutdown(dev); | |
1729 | } | |
1730 | } | |
e105b8bf DW |
1731 | kobject_put(sysfs_dev_char_kobj); |
1732 | kobject_put(sysfs_dev_block_kobj); | |
1733 | kobject_put(dev_kobj); | |
401097ea | 1734 | async_synchronize_full(); |
37b0c020 | 1735 | } |