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 | 58 | { |
3589972e AS |
59 | struct device_driver *drv; |
60 | ||
61 | /* dev->driver can change to NULL underneath us because of unbinding, | |
62 | * so be careful about accessing it. dev->bus and dev->class should | |
63 | * never change once they are set, so they don't need special care. | |
64 | */ | |
65 | drv = ACCESS_ONCE(dev->driver); | |
66 | return drv ? drv->name : | |
a456b702 JD |
67 | (dev->bus ? dev->bus->name : |
68 | (dev->class ? dev->class->name : "")); | |
3e95637a | 69 | } |
310a922d | 70 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 71 | |
1da177e4 LT |
72 | #define to_dev(obj) container_of(obj, struct device, kobj) |
73 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
74 | ||
4a3ad20c GKH |
75 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
76 | char *buf) | |
1da177e4 | 77 | { |
4a3ad20c GKH |
78 | struct device_attribute *dev_attr = to_dev_attr(attr); |
79 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 80 | ssize_t ret = -EIO; |
1da177e4 LT |
81 | |
82 | if (dev_attr->show) | |
54b6f35c | 83 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
84 | if (ret >= (ssize_t)PAGE_SIZE) { |
85 | print_symbol("dev_attr_show: %s returned bad count\n", | |
86 | (unsigned long)dev_attr->show); | |
87 | } | |
1da177e4 LT |
88 | return ret; |
89 | } | |
90 | ||
4a3ad20c GKH |
91 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
92 | const char *buf, size_t count) | |
1da177e4 | 93 | { |
4a3ad20c GKH |
94 | struct device_attribute *dev_attr = to_dev_attr(attr); |
95 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 96 | ssize_t ret = -EIO; |
1da177e4 LT |
97 | |
98 | if (dev_attr->store) | |
54b6f35c | 99 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
100 | return ret; |
101 | } | |
102 | ||
52cf25d0 | 103 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
104 | .show = dev_attr_show, |
105 | .store = dev_attr_store, | |
106 | }; | |
107 | ||
108 | ||
109 | /** | |
110 | * device_release - free device structure. | |
111 | * @kobj: device's kobject. | |
112 | * | |
113 | * This is called once the reference count for the object | |
114 | * reaches 0. We forward the call to the device's release | |
115 | * method, which should handle actually freeing the structure. | |
116 | */ | |
4a3ad20c | 117 | static void device_release(struct kobject *kobj) |
1da177e4 | 118 | { |
4a3ad20c | 119 | struct device *dev = to_dev(kobj); |
fb069a5d | 120 | struct device_private *p = dev->p; |
1da177e4 LT |
121 | |
122 | if (dev->release) | |
123 | dev->release(dev); | |
f9f852df KS |
124 | else if (dev->type && dev->type->release) |
125 | dev->type->release(dev); | |
2620efef GKH |
126 | else if (dev->class && dev->class->dev_release) |
127 | dev->class->dev_release(dev); | |
f810a5cf AV |
128 | else |
129 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 130 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 131 | dev_name(dev)); |
fb069a5d | 132 | kfree(p); |
1da177e4 LT |
133 | } |
134 | ||
8f4afc41 | 135 | static struct kobj_type device_ktype = { |
1da177e4 LT |
136 | .release = device_release, |
137 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
138 | }; |
139 | ||
140 | ||
312c004d | 141 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
142 | { |
143 | struct kobj_type *ktype = get_ktype(kobj); | |
144 | ||
8f4afc41 | 145 | if (ktype == &device_ktype) { |
1da177e4 LT |
146 | struct device *dev = to_dev(kobj); |
147 | if (dev->bus) | |
148 | return 1; | |
23681e47 GKH |
149 | if (dev->class) |
150 | return 1; | |
1da177e4 LT |
151 | } |
152 | return 0; | |
153 | } | |
154 | ||
312c004d | 155 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
156 | { |
157 | struct device *dev = to_dev(kobj); | |
158 | ||
23681e47 GKH |
159 | if (dev->bus) |
160 | return dev->bus->name; | |
161 | if (dev->class) | |
162 | return dev->class->name; | |
163 | return NULL; | |
1da177e4 LT |
164 | } |
165 | ||
7eff2e7a KS |
166 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
167 | struct kobj_uevent_env *env) | |
1da177e4 LT |
168 | { |
169 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
170 | int retval = 0; |
171 | ||
6fcf53ac | 172 | /* add device node properties if present */ |
23681e47 | 173 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
174 | const char *tmp; |
175 | const char *name; | |
e454cea2 | 176 | mode_t mode = 0; |
6fcf53ac | 177 | |
7eff2e7a KS |
178 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
179 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
e454cea2 | 180 | name = device_get_devnode(dev, &mode, &tmp); |
6fcf53ac KS |
181 | if (name) { |
182 | add_uevent_var(env, "DEVNAME=%s", name); | |
183 | kfree(tmp); | |
e454cea2 KS |
184 | if (mode) |
185 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
6fcf53ac | 186 | } |
23681e47 GKH |
187 | } |
188 | ||
414264f9 | 189 | if (dev->type && dev->type->name) |
7eff2e7a | 190 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 191 | |
239378f1 | 192 | if (dev->driver) |
7eff2e7a | 193 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 194 | |
a87cb2ac | 195 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
196 | if (dev->class) { |
197 | struct device *parent = dev->parent; | |
198 | ||
199 | /* find first bus device in parent chain */ | |
200 | while (parent && !parent->bus) | |
201 | parent = parent->parent; | |
202 | if (parent && parent->bus) { | |
203 | const char *path; | |
204 | ||
205 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 206 | if (path) { |
7eff2e7a | 207 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
208 | kfree(path); |
209 | } | |
239378f1 | 210 | |
7eff2e7a | 211 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
212 | |
213 | if (parent->driver) | |
7eff2e7a KS |
214 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
215 | parent->driver->name); | |
239378f1 KS |
216 | } |
217 | } else if (dev->bus) { | |
7eff2e7a | 218 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
219 | |
220 | if (dev->driver) | |
4a3ad20c GKH |
221 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
222 | dev->driver->name); | |
d81d9d6b | 223 | } |
239378f1 | 224 | #endif |
1da177e4 | 225 | |
7eff2e7a | 226 | /* have the bus specific function add its stuff */ |
312c004d | 227 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 228 | retval = dev->bus->uevent(dev, env); |
f9f852df | 229 | if (retval) |
7dc72b28 | 230 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 231 | dev_name(dev), __func__, retval); |
1da177e4 LT |
232 | } |
233 | ||
7eff2e7a | 234 | /* have the class specific function add its stuff */ |
2620efef | 235 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 236 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 237 | if (retval) |
7dc72b28 | 238 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 239 | "returned %d\n", dev_name(dev), |
2b3a302a | 240 | __func__, retval); |
f9f852df KS |
241 | } |
242 | ||
7eff2e7a | 243 | /* have the device type specific fuction add its stuff */ |
f9f852df | 244 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 245 | retval = dev->type->uevent(dev, env); |
f9f852df | 246 | if (retval) |
7dc72b28 | 247 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 248 | "returned %d\n", dev_name(dev), |
2b3a302a | 249 | __func__, retval); |
2620efef GKH |
250 | } |
251 | ||
1da177e4 LT |
252 | return retval; |
253 | } | |
254 | ||
9cd43611 | 255 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
256 | .filter = dev_uevent_filter, |
257 | .name = dev_uevent_name, | |
258 | .uevent = dev_uevent, | |
1da177e4 LT |
259 | }; |
260 | ||
16574dcc KS |
261 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
262 | char *buf) | |
263 | { | |
264 | struct kobject *top_kobj; | |
265 | struct kset *kset; | |
7eff2e7a | 266 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
267 | int i; |
268 | size_t count = 0; | |
269 | int retval; | |
270 | ||
271 | /* search the kset, the device belongs to */ | |
272 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
273 | while (!top_kobj->kset && top_kobj->parent) |
274 | top_kobj = top_kobj->parent; | |
16574dcc KS |
275 | if (!top_kobj->kset) |
276 | goto out; | |
5c5daf65 | 277 | |
16574dcc KS |
278 | kset = top_kobj->kset; |
279 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
280 | goto out; | |
281 | ||
282 | /* respect filter */ | |
283 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
284 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
285 | goto out; | |
286 | ||
7eff2e7a KS |
287 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
288 | if (!env) | |
c7308c81 GKH |
289 | return -ENOMEM; |
290 | ||
16574dcc | 291 | /* let the kset specific function add its keys */ |
7eff2e7a | 292 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
293 | if (retval) |
294 | goto out; | |
295 | ||
296 | /* copy keys to file */ | |
7eff2e7a KS |
297 | for (i = 0; i < env->envp_idx; i++) |
298 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 299 | out: |
7eff2e7a | 300 | kfree(env); |
16574dcc KS |
301 | return count; |
302 | } | |
303 | ||
a7fd6706 KS |
304 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
305 | const char *buf, size_t count) | |
306 | { | |
60a96a59 KS |
307 | enum kobject_action action; |
308 | ||
3f5468c9 | 309 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 310 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
311 | else |
312 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
313 | return count; |
314 | } | |
315 | ||
ad6a1e1c TH |
316 | static struct device_attribute uevent_attr = |
317 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
318 | ||
621a1672 DT |
319 | static int device_add_attributes(struct device *dev, |
320 | struct device_attribute *attrs) | |
de0ff00d | 321 | { |
621a1672 | 322 | int error = 0; |
de0ff00d | 323 | int i; |
621a1672 DT |
324 | |
325 | if (attrs) { | |
326 | for (i = 0; attr_name(attrs[i]); i++) { | |
327 | error = device_create_file(dev, &attrs[i]); | |
328 | if (error) | |
329 | break; | |
330 | } | |
331 | if (error) | |
332 | while (--i >= 0) | |
333 | device_remove_file(dev, &attrs[i]); | |
334 | } | |
335 | return error; | |
336 | } | |
337 | ||
338 | static void device_remove_attributes(struct device *dev, | |
339 | struct device_attribute *attrs) | |
340 | { | |
341 | int i; | |
342 | ||
343 | if (attrs) | |
344 | for (i = 0; attr_name(attrs[i]); i++) | |
345 | device_remove_file(dev, &attrs[i]); | |
346 | } | |
347 | ||
348 | static int device_add_groups(struct device *dev, | |
a4dbd674 | 349 | const struct attribute_group **groups) |
621a1672 | 350 | { |
de0ff00d | 351 | int error = 0; |
621a1672 | 352 | int i; |
de0ff00d | 353 | |
621a1672 DT |
354 | if (groups) { |
355 | for (i = 0; groups[i]; i++) { | |
356 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
357 | if (error) { |
358 | while (--i >= 0) | |
4a3ad20c GKH |
359 | sysfs_remove_group(&dev->kobj, |
360 | groups[i]); | |
621a1672 | 361 | break; |
de0ff00d GKH |
362 | } |
363 | } | |
364 | } | |
de0ff00d GKH |
365 | return error; |
366 | } | |
367 | ||
621a1672 | 368 | static void device_remove_groups(struct device *dev, |
a4dbd674 | 369 | const struct attribute_group **groups) |
de0ff00d GKH |
370 | { |
371 | int i; | |
621a1672 DT |
372 | |
373 | if (groups) | |
374 | for (i = 0; groups[i]; i++) | |
375 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
376 | } |
377 | ||
2620efef GKH |
378 | static int device_add_attrs(struct device *dev) |
379 | { | |
380 | struct class *class = dev->class; | |
f9f852df | 381 | struct device_type *type = dev->type; |
621a1672 | 382 | int error; |
2620efef | 383 | |
621a1672 DT |
384 | if (class) { |
385 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 386 | if (error) |
621a1672 | 387 | return error; |
2620efef | 388 | } |
f9f852df | 389 | |
621a1672 DT |
390 | if (type) { |
391 | error = device_add_groups(dev, type->groups); | |
f9f852df | 392 | if (error) |
621a1672 | 393 | goto err_remove_class_attrs; |
f9f852df KS |
394 | } |
395 | ||
621a1672 DT |
396 | error = device_add_groups(dev, dev->groups); |
397 | if (error) | |
398 | goto err_remove_type_groups; | |
399 | ||
400 | return 0; | |
401 | ||
402 | err_remove_type_groups: | |
403 | if (type) | |
404 | device_remove_groups(dev, type->groups); | |
405 | err_remove_class_attrs: | |
406 | if (class) | |
407 | device_remove_attributes(dev, class->dev_attrs); | |
408 | ||
2620efef GKH |
409 | return error; |
410 | } | |
411 | ||
412 | static void device_remove_attrs(struct device *dev) | |
413 | { | |
414 | struct class *class = dev->class; | |
f9f852df | 415 | struct device_type *type = dev->type; |
2620efef | 416 | |
621a1672 | 417 | device_remove_groups(dev, dev->groups); |
f9f852df | 418 | |
621a1672 DT |
419 | if (type) |
420 | device_remove_groups(dev, type->groups); | |
421 | ||
422 | if (class) | |
423 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
424 | } |
425 | ||
426 | ||
23681e47 GKH |
427 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
428 | char *buf) | |
429 | { | |
430 | return print_dev_t(buf, dev->devt); | |
431 | } | |
432 | ||
ad6a1e1c TH |
433 | static struct device_attribute devt_attr = |
434 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
435 | ||
881c6cfd GKH |
436 | /* kset to create /sys/devices/ */ |
437 | struct kset *devices_kset; | |
1da177e4 | 438 | |
1da177e4 | 439 | /** |
4a3ad20c GKH |
440 | * device_create_file - create sysfs attribute file for device. |
441 | * @dev: device. | |
442 | * @attr: device attribute descriptor. | |
1da177e4 | 443 | */ |
26579ab7 PC |
444 | int device_create_file(struct device *dev, |
445 | const struct device_attribute *attr) | |
1da177e4 LT |
446 | { |
447 | int error = 0; | |
0c98b19f | 448 | if (dev) |
1da177e4 | 449 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
450 | return error; |
451 | } | |
452 | ||
453 | /** | |
4a3ad20c GKH |
454 | * device_remove_file - remove sysfs attribute file. |
455 | * @dev: device. | |
456 | * @attr: device attribute descriptor. | |
1da177e4 | 457 | */ |
26579ab7 PC |
458 | void device_remove_file(struct device *dev, |
459 | const struct device_attribute *attr) | |
1da177e4 | 460 | { |
0c98b19f | 461 | if (dev) |
1da177e4 | 462 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
463 | } |
464 | ||
2589f188 GKH |
465 | /** |
466 | * device_create_bin_file - create sysfs binary attribute file for device. | |
467 | * @dev: device. | |
468 | * @attr: device binary attribute descriptor. | |
469 | */ | |
66ecb92b PC |
470 | int device_create_bin_file(struct device *dev, |
471 | const struct bin_attribute *attr) | |
2589f188 GKH |
472 | { |
473 | int error = -EINVAL; | |
474 | if (dev) | |
475 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
476 | return error; | |
477 | } | |
478 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
479 | ||
480 | /** | |
481 | * device_remove_bin_file - remove sysfs binary attribute file | |
482 | * @dev: device. | |
483 | * @attr: device binary attribute descriptor. | |
484 | */ | |
66ecb92b PC |
485 | void device_remove_bin_file(struct device *dev, |
486 | const struct bin_attribute *attr) | |
2589f188 GKH |
487 | { |
488 | if (dev) | |
489 | sysfs_remove_bin_file(&dev->kobj, attr); | |
490 | } | |
491 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
492 | ||
d9a9cdfb | 493 | /** |
523ded71 | 494 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
495 | * @dev: device. |
496 | * @func: callback function to invoke later. | |
523ded71 | 497 | * @owner: module owning the callback routine |
d9a9cdfb AS |
498 | * |
499 | * Attribute methods must not unregister themselves or their parent device | |
500 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
501 | * since unregistration is mutually exclusive with driver callbacks. | |
502 | * | |
503 | * Instead methods can call this routine, which will attempt to allocate | |
504 | * and schedule a workqueue request to call back @func with @dev as its | |
505 | * argument in the workqueue's process context. @dev will be pinned until | |
506 | * @func returns. | |
507 | * | |
523ded71 AS |
508 | * This routine is usually called via the inline device_schedule_callback(), |
509 | * which automatically sets @owner to THIS_MODULE. | |
510 | * | |
d9a9cdfb | 511 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 512 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
513 | * |
514 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
515 | * underlying sysfs routine (since it is intended for use by attribute | |
516 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
517 | */ | |
523ded71 AS |
518 | int device_schedule_callback_owner(struct device *dev, |
519 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
520 | { |
521 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 522 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 523 | } |
523ded71 | 524 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 525 | |
34bb61f9 JB |
526 | static void klist_children_get(struct klist_node *n) |
527 | { | |
f791b8c8 GKH |
528 | struct device_private *p = to_device_private_parent(n); |
529 | struct device *dev = p->device; | |
34bb61f9 JB |
530 | |
531 | get_device(dev); | |
532 | } | |
533 | ||
534 | static void klist_children_put(struct klist_node *n) | |
535 | { | |
f791b8c8 GKH |
536 | struct device_private *p = to_device_private_parent(n); |
537 | struct device *dev = p->device; | |
34bb61f9 JB |
538 | |
539 | put_device(dev); | |
540 | } | |
541 | ||
1da177e4 | 542 | /** |
4a3ad20c GKH |
543 | * device_initialize - init device structure. |
544 | * @dev: device. | |
1da177e4 | 545 | * |
5739411a CH |
546 | * This prepares the device for use by other layers by initializing |
547 | * its fields. | |
4a3ad20c | 548 | * It is the first half of device_register(), if called by |
5739411a CH |
549 | * that function, though it can also be called separately, so one |
550 | * may use @dev's fields. In particular, get_device()/put_device() | |
551 | * may be used for reference counting of @dev after calling this | |
552 | * function. | |
553 | * | |
554 | * NOTE: Use put_device() to give up your reference instead of freeing | |
555 | * @dev directly once you have called this function. | |
1da177e4 | 556 | */ |
1da177e4 LT |
557 | void device_initialize(struct device *dev) |
558 | { | |
881c6cfd | 559 | dev->kobj.kset = devices_kset; |
f9cb074b | 560 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 561 | INIT_LIST_HEAD(&dev->dma_pools); |
af70316a | 562 | init_MUTEX(&dev->sem); |
9ac7849e TH |
563 | spin_lock_init(&dev->devres_lock); |
564 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 565 | device_init_wakeup(dev, 0); |
3b98aeaf | 566 | device_pm_init(dev); |
87348136 | 567 | set_dev_node(dev, -1); |
1da177e4 LT |
568 | } |
569 | ||
40fa5422 | 570 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
571 | static struct kobject *get_device_parent(struct device *dev, |
572 | struct device *parent) | |
40fa5422 | 573 | { |
da231fd5 | 574 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 575 | if (dev->class && (!parent || parent->class != dev->class)) |
1fbfee6c | 576 | return &dev->class->p->class_subsys.kobj; |
da231fd5 | 577 | /* all other devices keep their parent */ |
40fa5422 | 578 | else if (parent) |
c744aeae | 579 | return &parent->kobj; |
40fa5422 | 580 | |
c744aeae | 581 | return NULL; |
40fa5422 | 582 | } |
da231fd5 KS |
583 | |
584 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
585 | static inline void cleanup_glue_dir(struct device *dev, |
586 | struct kobject *glue_dir) {} | |
40fa5422 | 587 | #else |
86406245 | 588 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 589 | { |
86406245 | 590 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 591 | |
86406245 | 592 | if (!virtual_dir) |
4ff6abff | 593 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 594 | &devices_kset->kobj); |
f0ee61a6 | 595 | |
86406245 | 596 | return virtual_dir; |
f0ee61a6 GKH |
597 | } |
598 | ||
da231fd5 KS |
599 | static struct kobject *get_device_parent(struct device *dev, |
600 | struct device *parent) | |
40fa5422 | 601 | { |
43968d2f GKH |
602 | int retval; |
603 | ||
86406245 | 604 | if (dev->class) { |
77d3d7c1 | 605 | static DEFINE_MUTEX(gdp_mutex); |
86406245 KS |
606 | struct kobject *kobj = NULL; |
607 | struct kobject *parent_kobj; | |
608 | struct kobject *k; | |
609 | ||
610 | /* | |
611 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
612 | * Class-devices with a non class-device as parent, live |
613 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
614 | */ |
615 | if (parent == NULL) | |
616 | parent_kobj = virtual_device_parent(dev); | |
617 | else if (parent->class) | |
618 | return &parent->kobj; | |
619 | else | |
620 | parent_kobj = &parent->kobj; | |
621 | ||
77d3d7c1 TH |
622 | mutex_lock(&gdp_mutex); |
623 | ||
86406245 | 624 | /* find our class-directory at the parent and reference it */ |
7c71448b GKH |
625 | spin_lock(&dev->class->p->class_dirs.list_lock); |
626 | list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) | |
86406245 KS |
627 | if (k->parent == parent_kobj) { |
628 | kobj = kobject_get(k); | |
629 | break; | |
630 | } | |
7c71448b | 631 | spin_unlock(&dev->class->p->class_dirs.list_lock); |
77d3d7c1 TH |
632 | if (kobj) { |
633 | mutex_unlock(&gdp_mutex); | |
86406245 | 634 | return kobj; |
77d3d7c1 | 635 | } |
86406245 KS |
636 | |
637 | /* or create a new class-directory at the parent device */ | |
43968d2f | 638 | k = kobject_create(); |
77d3d7c1 TH |
639 | if (!k) { |
640 | mutex_unlock(&gdp_mutex); | |
43968d2f | 641 | return NULL; |
77d3d7c1 | 642 | } |
7c71448b | 643 | k->kset = &dev->class->p->class_dirs; |
b2d6db58 | 644 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f | 645 | if (retval < 0) { |
77d3d7c1 | 646 | mutex_unlock(&gdp_mutex); |
43968d2f GKH |
647 | kobject_put(k); |
648 | return NULL; | |
649 | } | |
0f4dafc0 | 650 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 651 | mutex_unlock(&gdp_mutex); |
43968d2f | 652 | return k; |
86406245 KS |
653 | } |
654 | ||
655 | if (parent) | |
c744aeae CH |
656 | return &parent->kobj; |
657 | return NULL; | |
658 | } | |
da231fd5 | 659 | |
63b6971a | 660 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 661 | { |
0f4dafc0 | 662 | /* see if we live in a "glue" directory */ |
c1fe539a | 663 | if (!glue_dir || !dev->class || |
7c71448b | 664 | glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5 KS |
665 | return; |
666 | ||
0f4dafc0 | 667 | kobject_put(glue_dir); |
da231fd5 | 668 | } |
63b6971a CH |
669 | |
670 | static void cleanup_device_parent(struct device *dev) | |
671 | { | |
672 | cleanup_glue_dir(dev, dev->kobj.parent); | |
673 | } | |
c744aeae | 674 | #endif |
86406245 | 675 | |
63b6971a | 676 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
677 | { |
678 | struct kobject *kobj; | |
679 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
680 | if (kobj) |
681 | dev->kobj.parent = kobj; | |
40fa5422 | 682 | } |
40fa5422 | 683 | |
2ee97caf CH |
684 | static int device_add_class_symlinks(struct device *dev) |
685 | { | |
686 | int error; | |
687 | ||
688 | if (!dev->class) | |
689 | return 0; | |
da231fd5 | 690 | |
1fbfee6c GKH |
691 | error = sysfs_create_link(&dev->kobj, |
692 | &dev->class->p->class_subsys.kobj, | |
2ee97caf CH |
693 | "subsystem"); |
694 | if (error) | |
695 | goto out; | |
da231fd5 KS |
696 | |
697 | #ifdef CONFIG_SYSFS_DEPRECATED | |
698 | /* stacked class devices need a symlink in the class directory */ | |
1fbfee6c | 699 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 700 | device_is_not_partition(dev)) { |
1fbfee6c | 701 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 702 | &dev->kobj, dev_name(dev)); |
2ee97caf CH |
703 | if (error) |
704 | goto out_subsys; | |
705 | } | |
da231fd5 | 706 | |
4e886c29 | 707 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
708 | struct device *parent = dev->parent; |
709 | char *class_name; | |
4f01a757 | 710 | |
da231fd5 KS |
711 | /* |
712 | * stacked class devices have the 'device' link | |
713 | * pointing to the bus device instead of the parent | |
714 | */ | |
715 | while (parent->class && !parent->bus && parent->parent) | |
716 | parent = parent->parent; | |
717 | ||
718 | error = sysfs_create_link(&dev->kobj, | |
719 | &parent->kobj, | |
4f01a757 DT |
720 | "device"); |
721 | if (error) | |
722 | goto out_busid; | |
da231fd5 KS |
723 | |
724 | class_name = make_class_name(dev->class->name, | |
725 | &dev->kobj); | |
726 | if (class_name) | |
727 | error = sysfs_create_link(&dev->parent->kobj, | |
728 | &dev->kobj, class_name); | |
729 | kfree(class_name); | |
730 | if (error) | |
731 | goto out_device; | |
2ee97caf CH |
732 | } |
733 | return 0; | |
734 | ||
2ee97caf | 735 | out_device: |
4e886c29 | 736 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 737 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 738 | out_busid: |
1fbfee6c | 739 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 740 | device_is_not_partition(dev)) |
1fbfee6c | 741 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 742 | dev_name(dev)); |
da231fd5 KS |
743 | #else |
744 | /* link in the class directory pointing to the device */ | |
1fbfee6c | 745 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 746 | &dev->kobj, dev_name(dev)); |
da231fd5 KS |
747 | if (error) |
748 | goto out_subsys; | |
749 | ||
4e886c29 | 750 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
751 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
752 | "device"); | |
753 | if (error) | |
754 | goto out_busid; | |
755 | } | |
756 | return 0; | |
757 | ||
758 | out_busid: | |
1e0b2cf9 | 759 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
760 | #endif |
761 | ||
2ee97caf CH |
762 | out_subsys: |
763 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
764 | out: | |
765 | return error; | |
766 | } | |
767 | ||
768 | static void device_remove_class_symlinks(struct device *dev) | |
769 | { | |
770 | if (!dev->class) | |
771 | return; | |
da231fd5 | 772 | |
2ee97caf | 773 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 774 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
775 | char *class_name; |
776 | ||
777 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
778 | if (class_name) { | |
779 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
780 | kfree(class_name); | |
781 | } | |
2ee97caf CH |
782 | sysfs_remove_link(&dev->kobj, "device"); |
783 | } | |
da231fd5 | 784 | |
1fbfee6c | 785 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 786 | device_is_not_partition(dev)) |
1fbfee6c | 787 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 788 | dev_name(dev)); |
da231fd5 | 789 | #else |
4e886c29 | 790 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
791 | sysfs_remove_link(&dev->kobj, "device"); |
792 | ||
1e0b2cf9 | 793 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
794 | #endif |
795 | ||
2ee97caf CH |
796 | sysfs_remove_link(&dev->kobj, "subsystem"); |
797 | } | |
798 | ||
413c239f SR |
799 | /** |
800 | * dev_set_name - set a device name | |
801 | * @dev: device | |
46232366 | 802 | * @fmt: format string for the device's name |
413c239f SR |
803 | */ |
804 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
805 | { | |
806 | va_list vargs; | |
1fa5ae85 | 807 | int err; |
413c239f SR |
808 | |
809 | va_start(vargs, fmt); | |
1fa5ae85 | 810 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 811 | va_end(vargs); |
1fa5ae85 | 812 | return err; |
413c239f SR |
813 | } |
814 | EXPORT_SYMBOL_GPL(dev_set_name); | |
815 | ||
e105b8bf DW |
816 | /** |
817 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
818 | * @dev: device | |
819 | * | |
820 | * By default we select char/ for new entries. Setting class->dev_obj | |
821 | * to NULL prevents an entry from being created. class->dev_kobj must | |
822 | * be set (or cleared) before any devices are registered to the class | |
823 | * otherwise device_create_sys_dev_entry() and | |
824 | * device_remove_sys_dev_entry() will disagree about the the presence | |
825 | * of the link. | |
826 | */ | |
827 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
828 | { | |
829 | struct kobject *kobj; | |
830 | ||
831 | if (dev->class) | |
832 | kobj = dev->class->dev_kobj; | |
833 | else | |
834 | kobj = sysfs_dev_char_kobj; | |
835 | ||
836 | return kobj; | |
837 | } | |
838 | ||
839 | static int device_create_sys_dev_entry(struct device *dev) | |
840 | { | |
841 | struct kobject *kobj = device_to_dev_kobj(dev); | |
842 | int error = 0; | |
843 | char devt_str[15]; | |
844 | ||
845 | if (kobj) { | |
846 | format_dev_t(devt_str, dev->devt); | |
847 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
848 | } | |
849 | ||
850 | return error; | |
851 | } | |
852 | ||
853 | static void device_remove_sys_dev_entry(struct device *dev) | |
854 | { | |
855 | struct kobject *kobj = device_to_dev_kobj(dev); | |
856 | char devt_str[15]; | |
857 | ||
858 | if (kobj) { | |
859 | format_dev_t(devt_str, dev->devt); | |
860 | sysfs_remove_link(kobj, devt_str); | |
861 | } | |
862 | } | |
863 | ||
b4028437 GKH |
864 | int device_private_init(struct device *dev) |
865 | { | |
866 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
867 | if (!dev->p) | |
868 | return -ENOMEM; | |
869 | dev->p->device = dev; | |
870 | klist_init(&dev->p->klist_children, klist_children_get, | |
871 | klist_children_put); | |
872 | return 0; | |
873 | } | |
874 | ||
1da177e4 | 875 | /** |
4a3ad20c GKH |
876 | * device_add - add device to device hierarchy. |
877 | * @dev: device. | |
1da177e4 | 878 | * |
4a3ad20c GKH |
879 | * This is part 2 of device_register(), though may be called |
880 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 881 | * |
5739411a | 882 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
883 | * to the global and sibling lists for the device, then |
884 | * adds it to the other relevant subsystems of the driver model. | |
5739411a CH |
885 | * |
886 | * NOTE: _Never_ directly free @dev after calling this function, even | |
887 | * if it returned an error! Always use put_device() to give up your | |
888 | * reference instead. | |
1da177e4 LT |
889 | */ |
890 | int device_add(struct device *dev) | |
891 | { | |
892 | struct device *parent = NULL; | |
c47ed219 | 893 | struct class_interface *class_intf; |
c906a48a | 894 | int error = -EINVAL; |
775b64d2 | 895 | |
1da177e4 | 896 | dev = get_device(dev); |
c906a48a GKH |
897 | if (!dev) |
898 | goto done; | |
899 | ||
fb069a5d | 900 | if (!dev->p) { |
b4028437 GKH |
901 | error = device_private_init(dev); |
902 | if (error) | |
903 | goto done; | |
fb069a5d | 904 | } |
fb069a5d | 905 | |
1fa5ae85 KS |
906 | /* |
907 | * for statically allocated devices, which should all be converted | |
908 | * some day, we need to initialize the name. We prevent reading back | |
909 | * the name, and force the use of dev_name() | |
910 | */ | |
911 | if (dev->init_name) { | |
acc0e90f | 912 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
913 | dev->init_name = NULL; |
914 | } | |
c906a48a | 915 | |
e6309e75 TG |
916 | if (!dev_name(dev)) { |
917 | error = -EINVAL; | |
5c8563d7 | 918 | goto name_error; |
e6309e75 | 919 | } |
1da177e4 | 920 | |
1e0b2cf9 | 921 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 922 | |
1da177e4 | 923 | parent = get_device(dev->parent); |
63b6971a | 924 | setup_parent(dev, parent); |
1da177e4 | 925 | |
0d358f22 YL |
926 | /* use parent numa_node */ |
927 | if (parent) | |
928 | set_dev_node(dev, dev_to_node(parent)); | |
929 | ||
1da177e4 | 930 | /* first, register with generic layer. */ |
8a577ffc KS |
931 | /* we require the name to be set before, and pass NULL */ |
932 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 933 | if (error) |
1da177e4 | 934 | goto Error; |
a7fd6706 | 935 | |
37022644 BW |
936 | /* notify platform of device entry */ |
937 | if (platform_notify) | |
938 | platform_notify(dev); | |
939 | ||
ad6a1e1c | 940 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
941 | if (error) |
942 | goto attrError; | |
a7fd6706 | 943 | |
23681e47 | 944 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
945 | error = device_create_file(dev, &devt_attr); |
946 | if (error) | |
a306eea4 | 947 | goto ueventattrError; |
e105b8bf DW |
948 | |
949 | error = device_create_sys_dev_entry(dev); | |
950 | if (error) | |
951 | goto devtattrError; | |
2b2af54a KS |
952 | |
953 | devtmpfs_create_node(dev); | |
23681e47 GKH |
954 | } |
955 | ||
2ee97caf CH |
956 | error = device_add_class_symlinks(dev); |
957 | if (error) | |
958 | goto SymlinkError; | |
dc0afa83 CH |
959 | error = device_add_attrs(dev); |
960 | if (error) | |
2620efef | 961 | goto AttrsError; |
dc0afa83 CH |
962 | error = bus_add_device(dev); |
963 | if (error) | |
1da177e4 | 964 | goto BusError; |
3b98aeaf | 965 | error = dpm_sysfs_add(dev); |
57eee3d2 | 966 | if (error) |
3b98aeaf AS |
967 | goto DPMError; |
968 | device_pm_add(dev); | |
ec0676ee AS |
969 | |
970 | /* Notify clients of device addition. This call must come | |
971 | * after dpm_sysf_add() and before kobject_uevent(). | |
972 | */ | |
973 | if (dev->bus) | |
974 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
975 | BUS_NOTIFY_ADD_DEVICE, dev); | |
976 | ||
83b5fb4c | 977 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 978 | bus_probe_device(dev); |
1da177e4 | 979 | if (parent) |
f791b8c8 GKH |
980 | klist_add_tail(&dev->p->knode_parent, |
981 | &parent->p->klist_children); | |
1da177e4 | 982 | |
5d9fd169 | 983 | if (dev->class) { |
f75b1c60 | 984 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 985 | /* tie the class to the device */ |
5a3ceb86 TH |
986 | klist_add_tail(&dev->knode_class, |
987 | &dev->class->p->class_devices); | |
c47ed219 GKH |
988 | |
989 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
990 | list_for_each_entry(class_intf, |
991 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
992 | if (class_intf->add_dev) |
993 | class_intf->add_dev(dev, class_intf); | |
f75b1c60 | 994 | mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169 | 995 | } |
c906a48a | 996 | done: |
1da177e4 LT |
997 | put_device(dev); |
998 | return error; | |
3b98aeaf | 999 | DPMError: |
57eee3d2 RW |
1000 | bus_remove_device(dev); |
1001 | BusError: | |
82f0cf9b | 1002 | device_remove_attrs(dev); |
2620efef | 1003 | AttrsError: |
2ee97caf CH |
1004 | device_remove_class_symlinks(dev); |
1005 | SymlinkError: | |
ad72956d KS |
1006 | if (MAJOR(dev->devt)) |
1007 | devtmpfs_delete_node(dev); | |
e105b8bf DW |
1008 | if (MAJOR(dev->devt)) |
1009 | device_remove_sys_dev_entry(dev); | |
1010 | devtattrError: | |
ad6a1e1c TH |
1011 | if (MAJOR(dev->devt)) |
1012 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 1013 | ueventattrError: |
ad6a1e1c | 1014 | device_remove_file(dev, &uevent_attr); |
23681e47 | 1015 | attrError: |
312c004d | 1016 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
1017 | kobject_del(&dev->kobj); |
1018 | Error: | |
63b6971a | 1019 | cleanup_device_parent(dev); |
1da177e4 LT |
1020 | if (parent) |
1021 | put_device(parent); | |
5c8563d7 KS |
1022 | name_error: |
1023 | kfree(dev->p); | |
1024 | dev->p = NULL; | |
c906a48a | 1025 | goto done; |
1da177e4 LT |
1026 | } |
1027 | ||
1da177e4 | 1028 | /** |
4a3ad20c GKH |
1029 | * device_register - register a device with the system. |
1030 | * @dev: pointer to the device structure | |
1da177e4 | 1031 | * |
4a3ad20c GKH |
1032 | * This happens in two clean steps - initialize the device |
1033 | * and add it to the system. The two steps can be called | |
1034 | * separately, but this is the easiest and most common. | |
1035 | * I.e. you should only call the two helpers separately if | |
1036 | * have a clearly defined need to use and refcount the device | |
1037 | * before it is added to the hierarchy. | |
5739411a CH |
1038 | * |
1039 | * NOTE: _Never_ directly free @dev after calling this function, even | |
1040 | * if it returned an error! Always use put_device() to give up the | |
1041 | * reference initialized in this function instead. | |
1da177e4 | 1042 | */ |
1da177e4 LT |
1043 | int device_register(struct device *dev) |
1044 | { | |
1045 | device_initialize(dev); | |
1046 | return device_add(dev); | |
1047 | } | |
1048 | ||
1da177e4 | 1049 | /** |
4a3ad20c GKH |
1050 | * get_device - increment reference count for device. |
1051 | * @dev: device. | |
1da177e4 | 1052 | * |
4a3ad20c GKH |
1053 | * This simply forwards the call to kobject_get(), though |
1054 | * we do take care to provide for the case that we get a NULL | |
1055 | * pointer passed in. | |
1da177e4 | 1056 | */ |
4a3ad20c | 1057 | struct device *get_device(struct device *dev) |
1da177e4 LT |
1058 | { |
1059 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
1060 | } | |
1061 | ||
1da177e4 | 1062 | /** |
4a3ad20c GKH |
1063 | * put_device - decrement reference count. |
1064 | * @dev: device in question. | |
1da177e4 | 1065 | */ |
4a3ad20c | 1066 | void put_device(struct device *dev) |
1da177e4 | 1067 | { |
edfaa7c3 | 1068 | /* might_sleep(); */ |
1da177e4 LT |
1069 | if (dev) |
1070 | kobject_put(&dev->kobj); | |
1071 | } | |
1072 | ||
1da177e4 | 1073 | /** |
4a3ad20c GKH |
1074 | * device_del - delete device from system. |
1075 | * @dev: device. | |
1da177e4 | 1076 | * |
4a3ad20c GKH |
1077 | * This is the first part of the device unregistration |
1078 | * sequence. This removes the device from the lists we control | |
1079 | * from here, has it removed from the other driver model | |
1080 | * subsystems it was added to in device_add(), and removes it | |
1081 | * from the kobject hierarchy. | |
1da177e4 | 1082 | * |
4a3ad20c GKH |
1083 | * NOTE: this should be called manually _iff_ device_add() was |
1084 | * also called manually. | |
1da177e4 | 1085 | */ |
4a3ad20c | 1086 | void device_del(struct device *dev) |
1da177e4 | 1087 | { |
4a3ad20c | 1088 | struct device *parent = dev->parent; |
c47ed219 | 1089 | struct class_interface *class_intf; |
1da177e4 | 1090 | |
ec0676ee AS |
1091 | /* Notify clients of device removal. This call must come |
1092 | * before dpm_sysfs_remove(). | |
1093 | */ | |
1094 | if (dev->bus) | |
1095 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1096 | BUS_NOTIFY_DEL_DEVICE, dev); | |
775b64d2 | 1097 | device_pm_remove(dev); |
3b98aeaf | 1098 | dpm_sysfs_remove(dev); |
1da177e4 | 1099 | if (parent) |
f791b8c8 | 1100 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1101 | if (MAJOR(dev->devt)) { |
2b2af54a | 1102 | devtmpfs_delete_node(dev); |
e105b8bf | 1103 | device_remove_sys_dev_entry(dev); |
ad6a1e1c | 1104 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1105 | } |
b9d9c82b | 1106 | if (dev->class) { |
da231fd5 | 1107 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1108 | |
f75b1c60 | 1109 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 1110 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1111 | list_for_each_entry(class_intf, |
1112 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1113 | if (class_intf->remove_dev) |
1114 | class_intf->remove_dev(dev, class_intf); | |
1115 | /* remove the device from the class list */ | |
5a3ceb86 | 1116 | klist_del(&dev->knode_class); |
f75b1c60 | 1117 | mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b | 1118 | } |
ad6a1e1c | 1119 | device_remove_file(dev, &uevent_attr); |
2620efef | 1120 | device_remove_attrs(dev); |
28953533 | 1121 | bus_remove_device(dev); |
1da177e4 | 1122 | |
2f8d16a9 TH |
1123 | /* |
1124 | * Some platform devices are driven without driver attached | |
1125 | * and managed resources may have been acquired. Make sure | |
1126 | * all resources are released. | |
1127 | */ | |
1128 | devres_release_all(dev); | |
1129 | ||
1da177e4 LT |
1130 | /* Notify the platform of the removal, in case they |
1131 | * need to do anything... | |
1132 | */ | |
1133 | if (platform_notify_remove) | |
1134 | platform_notify_remove(dev); | |
312c004d | 1135 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1136 | cleanup_device_parent(dev); |
1da177e4 | 1137 | kobject_del(&dev->kobj); |
da231fd5 | 1138 | put_device(parent); |
1da177e4 LT |
1139 | } |
1140 | ||
1141 | /** | |
4a3ad20c GKH |
1142 | * device_unregister - unregister device from system. |
1143 | * @dev: device going away. | |
1da177e4 | 1144 | * |
4a3ad20c GKH |
1145 | * We do this in two parts, like we do device_register(). First, |
1146 | * we remove it from all the subsystems with device_del(), then | |
1147 | * we decrement the reference count via put_device(). If that | |
1148 | * is the final reference count, the device will be cleaned up | |
1149 | * via device_release() above. Otherwise, the structure will | |
1150 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1151 | */ |
4a3ad20c | 1152 | void device_unregister(struct device *dev) |
1da177e4 | 1153 | { |
1e0b2cf9 | 1154 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1155 | device_del(dev); |
1156 | put_device(dev); | |
1157 | } | |
1158 | ||
4a3ad20c | 1159 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1160 | { |
4a3ad20c | 1161 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1162 | struct device *dev = NULL; |
1163 | struct device_private *p; | |
1164 | ||
1165 | if (n) { | |
1166 | p = to_device_private_parent(n); | |
1167 | dev = p->device; | |
1168 | } | |
1169 | return dev; | |
36239577 PM |
1170 | } |
1171 | ||
6fcf53ac | 1172 | /** |
e454cea2 | 1173 | * device_get_devnode - path of device node file |
6fcf53ac | 1174 | * @dev: device |
e454cea2 | 1175 | * @mode: returned file access mode |
6fcf53ac KS |
1176 | * @tmp: possibly allocated string |
1177 | * | |
1178 | * Return the relative path of a possible device node. | |
1179 | * Non-default names may need to allocate a memory to compose | |
1180 | * a name. This memory is returned in tmp and needs to be | |
1181 | * freed by the caller. | |
1182 | */ | |
e454cea2 KS |
1183 | const char *device_get_devnode(struct device *dev, |
1184 | mode_t *mode, const char **tmp) | |
6fcf53ac KS |
1185 | { |
1186 | char *s; | |
1187 | ||
1188 | *tmp = NULL; | |
1189 | ||
1190 | /* the device type may provide a specific name */ | |
e454cea2 KS |
1191 | if (dev->type && dev->type->devnode) |
1192 | *tmp = dev->type->devnode(dev, mode); | |
6fcf53ac KS |
1193 | if (*tmp) |
1194 | return *tmp; | |
1195 | ||
1196 | /* the class may provide a specific name */ | |
e454cea2 KS |
1197 | if (dev->class && dev->class->devnode) |
1198 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1199 | if (*tmp) |
1200 | return *tmp; | |
1201 | ||
1202 | /* return name without allocation, tmp == NULL */ | |
1203 | if (strchr(dev_name(dev), '!') == NULL) | |
1204 | return dev_name(dev); | |
1205 | ||
1206 | /* replace '!' in the name with '/' */ | |
1207 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1208 | if (!*tmp) | |
1209 | return NULL; | |
1210 | while ((s = strchr(*tmp, '!'))) | |
1211 | s[0] = '/'; | |
1212 | return *tmp; | |
1213 | } | |
1214 | ||
1da177e4 | 1215 | /** |
4a3ad20c GKH |
1216 | * device_for_each_child - device child iterator. |
1217 | * @parent: parent struct device. | |
1218 | * @data: data for the callback. | |
1219 | * @fn: function to be called for each device. | |
1da177e4 | 1220 | * |
4a3ad20c GKH |
1221 | * Iterate over @parent's child devices, and call @fn for each, |
1222 | * passing it @data. | |
1da177e4 | 1223 | * |
4a3ad20c GKH |
1224 | * We check the return of @fn each time. If it returns anything |
1225 | * other than 0, we break out and return that value. | |
1da177e4 | 1226 | */ |
4a3ad20c GKH |
1227 | int device_for_each_child(struct device *parent, void *data, |
1228 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1229 | { |
36239577 | 1230 | struct klist_iter i; |
4a3ad20c | 1231 | struct device *child; |
1da177e4 LT |
1232 | int error = 0; |
1233 | ||
014c90db GKH |
1234 | if (!parent->p) |
1235 | return 0; | |
1236 | ||
f791b8c8 | 1237 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 PM |
1238 | while ((child = next_device(&i)) && !error) |
1239 | error = fn(child, data); | |
1240 | klist_iter_exit(&i); | |
1da177e4 LT |
1241 | return error; |
1242 | } | |
1243 | ||
5ab69981 CH |
1244 | /** |
1245 | * device_find_child - device iterator for locating a particular device. | |
1246 | * @parent: parent struct device | |
1247 | * @data: Data to pass to match function | |
1248 | * @match: Callback function to check device | |
1249 | * | |
1250 | * This is similar to the device_for_each_child() function above, but it | |
1251 | * returns a reference to a device that is 'found' for later use, as | |
1252 | * determined by the @match callback. | |
1253 | * | |
1254 | * The callback should return 0 if the device doesn't match and non-zero | |
1255 | * if it does. If the callback returns non-zero and a reference to the | |
1256 | * current device can be obtained, this function will return to the caller | |
1257 | * and not iterate over any more devices. | |
1258 | */ | |
4a3ad20c GKH |
1259 | struct device *device_find_child(struct device *parent, void *data, |
1260 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1261 | { |
1262 | struct klist_iter i; | |
1263 | struct device *child; | |
1264 | ||
1265 | if (!parent) | |
1266 | return NULL; | |
1267 | ||
f791b8c8 | 1268 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1269 | while ((child = next_device(&i))) |
1270 | if (match(child, data) && get_device(child)) | |
1271 | break; | |
1272 | klist_iter_exit(&i); | |
1273 | return child; | |
1274 | } | |
1275 | ||
1da177e4 LT |
1276 | int __init devices_init(void) |
1277 | { | |
881c6cfd GKH |
1278 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1279 | if (!devices_kset) | |
1280 | return -ENOMEM; | |
e105b8bf DW |
1281 | dev_kobj = kobject_create_and_add("dev", NULL); |
1282 | if (!dev_kobj) | |
1283 | goto dev_kobj_err; | |
1284 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1285 | if (!sysfs_dev_block_kobj) | |
1286 | goto block_kobj_err; | |
1287 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1288 | if (!sysfs_dev_char_kobj) | |
1289 | goto char_kobj_err; | |
1290 | ||
881c6cfd | 1291 | return 0; |
e105b8bf DW |
1292 | |
1293 | char_kobj_err: | |
1294 | kobject_put(sysfs_dev_block_kobj); | |
1295 | block_kobj_err: | |
1296 | kobject_put(dev_kobj); | |
1297 | dev_kobj_err: | |
1298 | kset_unregister(devices_kset); | |
1299 | return -ENOMEM; | |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1303 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1304 | |
1305 | EXPORT_SYMBOL_GPL(device_initialize); | |
1306 | EXPORT_SYMBOL_GPL(device_add); | |
1307 | EXPORT_SYMBOL_GPL(device_register); | |
1308 | ||
1309 | EXPORT_SYMBOL_GPL(device_del); | |
1310 | EXPORT_SYMBOL_GPL(device_unregister); | |
1311 | EXPORT_SYMBOL_GPL(get_device); | |
1312 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1313 | |
1314 | EXPORT_SYMBOL_GPL(device_create_file); | |
1315 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 | 1316 | |
0aa0dc41 MM |
1317 | struct root_device |
1318 | { | |
1319 | struct device dev; | |
1320 | struct module *owner; | |
1321 | }; | |
1322 | ||
1323 | #define to_root_device(dev) container_of(dev, struct root_device, dev) | |
1324 | ||
1325 | static void root_device_release(struct device *dev) | |
1326 | { | |
1327 | kfree(to_root_device(dev)); | |
1328 | } | |
1329 | ||
1330 | /** | |
1331 | * __root_device_register - allocate and register a root device | |
1332 | * @name: root device name | |
1333 | * @owner: owner module of the root device, usually THIS_MODULE | |
1334 | * | |
1335 | * This function allocates a root device and registers it | |
1336 | * using device_register(). In order to free the returned | |
1337 | * device, use root_device_unregister(). | |
1338 | * | |
1339 | * Root devices are dummy devices which allow other devices | |
1340 | * to be grouped under /sys/devices. Use this function to | |
1341 | * allocate a root device and then use it as the parent of | |
1342 | * any device which should appear under /sys/devices/{name} | |
1343 | * | |
1344 | * The /sys/devices/{name} directory will also contain a | |
1345 | * 'module' symlink which points to the @owner directory | |
1346 | * in sysfs. | |
1347 | * | |
f0eae0ed JN |
1348 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1349 | * | |
0aa0dc41 MM |
1350 | * Note: You probably want to use root_device_register(). |
1351 | */ | |
1352 | struct device *__root_device_register(const char *name, struct module *owner) | |
1353 | { | |
1354 | struct root_device *root; | |
1355 | int err = -ENOMEM; | |
1356 | ||
1357 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1358 | if (!root) | |
1359 | return ERR_PTR(err); | |
1360 | ||
acc0e90f | 1361 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1362 | if (err) { |
1363 | kfree(root); | |
1364 | return ERR_PTR(err); | |
1365 | } | |
1366 | ||
1367 | root->dev.release = root_device_release; | |
1368 | ||
1369 | err = device_register(&root->dev); | |
1370 | if (err) { | |
1371 | put_device(&root->dev); | |
1372 | return ERR_PTR(err); | |
1373 | } | |
1374 | ||
1375 | #ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */ | |
1376 | if (owner) { | |
1377 | struct module_kobject *mk = &owner->mkobj; | |
1378 | ||
1379 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1380 | if (err) { | |
1381 | device_unregister(&root->dev); | |
1382 | return ERR_PTR(err); | |
1383 | } | |
1384 | root->owner = owner; | |
1385 | } | |
1386 | #endif | |
1387 | ||
1388 | return &root->dev; | |
1389 | } | |
1390 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1391 | ||
1392 | /** | |
1393 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1394 | * @dev: device going away |
0aa0dc41 MM |
1395 | * |
1396 | * This function unregisters and cleans up a device that was created by | |
1397 | * root_device_register(). | |
1398 | */ | |
1399 | void root_device_unregister(struct device *dev) | |
1400 | { | |
1401 | struct root_device *root = to_root_device(dev); | |
1402 | ||
1403 | if (root->owner) | |
1404 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1405 | ||
1406 | device_unregister(dev); | |
1407 | } | |
1408 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1409 | ||
23681e47 GKH |
1410 | |
1411 | static void device_create_release(struct device *dev) | |
1412 | { | |
1e0b2cf9 | 1413 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1414 | kfree(dev); |
1415 | } | |
1416 | ||
1417 | /** | |
8882b394 | 1418 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1419 | * @class: pointer to the struct class that this device should be registered to |
1420 | * @parent: pointer to the parent struct device of this new device, if any | |
1421 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1422 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1423 | * @fmt: string for the device's name |
8882b394 | 1424 | * @args: va_list for the device's name |
42734daf HK |
1425 | * |
1426 | * This function can be used by char device classes. A struct device | |
1427 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1428 | * |
23681e47 GKH |
1429 | * A "dev" file will be created, showing the dev_t for the device, if |
1430 | * the dev_t is not 0,0. | |
42734daf HK |
1431 | * If a pointer to a parent struct device is passed in, the newly created |
1432 | * struct device will be a child of that device in sysfs. | |
1433 | * The pointer to the struct device will be returned from the call. | |
1434 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1435 | * pointer. |
1436 | * | |
f0eae0ed JN |
1437 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1438 | * | |
23681e47 GKH |
1439 | * Note: the struct class passed to this function must have previously |
1440 | * been created with a call to class_create(). | |
1441 | */ | |
8882b394 GKH |
1442 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1443 | dev_t devt, void *drvdata, const char *fmt, | |
1444 | va_list args) | |
23681e47 | 1445 | { |
23681e47 GKH |
1446 | struct device *dev = NULL; |
1447 | int retval = -ENODEV; | |
1448 | ||
1449 | if (class == NULL || IS_ERR(class)) | |
1450 | goto error; | |
23681e47 GKH |
1451 | |
1452 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1453 | if (!dev) { | |
1454 | retval = -ENOMEM; | |
1455 | goto error; | |
1456 | } | |
1457 | ||
1458 | dev->devt = devt; | |
1459 | dev->class = class; | |
1460 | dev->parent = parent; | |
1461 | dev->release = device_create_release; | |
8882b394 | 1462 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1463 | |
1fa5ae85 KS |
1464 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1465 | if (retval) | |
1466 | goto error; | |
1467 | ||
23681e47 GKH |
1468 | retval = device_register(dev); |
1469 | if (retval) | |
1470 | goto error; | |
1471 | ||
23681e47 GKH |
1472 | return dev; |
1473 | ||
1474 | error: | |
286661b3 | 1475 | put_device(dev); |
23681e47 GKH |
1476 | return ERR_PTR(retval); |
1477 | } | |
8882b394 GKH |
1478 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1479 | ||
1480 | /** | |
4e106739 | 1481 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1482 | * @class: pointer to the struct class that this device should be registered to |
1483 | * @parent: pointer to the parent struct device of this new device, if any | |
1484 | * @devt: the dev_t for the char device to be added | |
1485 | * @drvdata: the data to be added to the device for callbacks | |
1486 | * @fmt: string for the device's name | |
1487 | * | |
1488 | * This function can be used by char device classes. A struct device | |
1489 | * will be created in sysfs, registered to the specified class. | |
1490 | * | |
1491 | * A "dev" file will be created, showing the dev_t for the device, if | |
1492 | * the dev_t is not 0,0. | |
1493 | * If a pointer to a parent struct device is passed in, the newly created | |
1494 | * struct device will be a child of that device in sysfs. | |
1495 | * The pointer to the struct device will be returned from the call. | |
1496 | * Any further sysfs files that might be required can be created using this | |
1497 | * pointer. | |
1498 | * | |
f0eae0ed JN |
1499 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1500 | * | |
8882b394 GKH |
1501 | * Note: the struct class passed to this function must have previously |
1502 | * been created with a call to class_create(). | |
1503 | */ | |
4e106739 GKH |
1504 | struct device *device_create(struct class *class, struct device *parent, |
1505 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1506 | { |
1507 | va_list vargs; | |
1508 | struct device *dev; | |
1509 | ||
1510 | va_start(vargs, fmt); | |
1511 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1512 | va_end(vargs); | |
1513 | return dev; | |
1514 | } | |
4e106739 | 1515 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1516 | |
cd35449b | 1517 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1518 | { |
cd35449b | 1519 | dev_t *devt = data; |
23681e47 | 1520 | |
cd35449b | 1521 | return dev->devt == *devt; |
775b64d2 RW |
1522 | } |
1523 | ||
1524 | /** | |
1525 | * device_destroy - removes a device that was created with device_create() | |
1526 | * @class: pointer to the struct class that this device was registered with | |
1527 | * @devt: the dev_t of the device that was previously registered | |
1528 | * | |
1529 | * This call unregisters and cleans up a device that was created with a | |
1530 | * call to device_create(). | |
1531 | */ | |
1532 | void device_destroy(struct class *class, dev_t devt) | |
1533 | { | |
1534 | struct device *dev; | |
23681e47 | 1535 | |
695794ae | 1536 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1537 | if (dev) { |
1538 | put_device(dev); | |
23681e47 | 1539 | device_unregister(dev); |
cd35449b | 1540 | } |
23681e47 GKH |
1541 | } |
1542 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1543 | |
1544 | /** | |
1545 | * device_rename - renames a device | |
1546 | * @dev: the pointer to the struct device to be renamed | |
1547 | * @new_name: the new name of the device | |
030c1d2b EB |
1548 | * |
1549 | * It is the responsibility of the caller to provide mutual | |
1550 | * exclusion between two different calls of device_rename | |
1551 | * on the same device to ensure that new_name is valid and | |
1552 | * won't conflict with other devices. | |
a2de48ca GKH |
1553 | */ |
1554 | int device_rename(struct device *dev, char *new_name) | |
1555 | { | |
1556 | char *old_class_name = NULL; | |
1557 | char *new_class_name = NULL; | |
2ee97caf | 1558 | char *old_device_name = NULL; |
a2de48ca GKH |
1559 | int error; |
1560 | ||
1561 | dev = get_device(dev); | |
1562 | if (!dev) | |
1563 | return -EINVAL; | |
1564 | ||
1e0b2cf9 | 1565 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1566 | __func__, new_name); |
a2de48ca | 1567 | |
99ef3ef8 | 1568 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1569 | if ((dev->class) && (dev->parent)) |
1570 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1571 | #endif |
a2de48ca | 1572 | |
1fa5ae85 | 1573 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1574 | if (!old_device_name) { |
1575 | error = -ENOMEM; | |
1576 | goto out; | |
a2de48ca | 1577 | } |
a2de48ca GKH |
1578 | |
1579 | error = kobject_rename(&dev->kobj, new_name); | |
1fa5ae85 | 1580 | if (error) |
2ee97caf | 1581 | goto out; |
a2de48ca | 1582 | |
99ef3ef8 | 1583 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1584 | if (old_class_name) { |
1585 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1586 | if (new_class_name) { | |
2354dcc7 EB |
1587 | error = sysfs_rename_link(&dev->parent->kobj, |
1588 | &dev->kobj, | |
1589 | old_class_name, | |
1590 | new_class_name); | |
a2de48ca GKH |
1591 | } |
1592 | } | |
60b8cabd | 1593 | #else |
a2de48ca | 1594 | if (dev->class) { |
2354dcc7 EB |
1595 | error = sysfs_rename_link(&dev->class->p->class_subsys.kobj, |
1596 | &dev->kobj, old_device_name, new_name); | |
a2de48ca | 1597 | } |
60b8cabd KS |
1598 | #endif |
1599 | ||
2ee97caf | 1600 | out: |
a2de48ca GKH |
1601 | put_device(dev); |
1602 | ||
a2de48ca | 1603 | kfree(new_class_name); |
952ab431 | 1604 | kfree(old_class_name); |
2ee97caf | 1605 | kfree(old_device_name); |
a2de48ca GKH |
1606 | |
1607 | return error; | |
1608 | } | |
a2807dbc | 1609 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1610 | |
1611 | static int device_move_class_links(struct device *dev, | |
1612 | struct device *old_parent, | |
1613 | struct device *new_parent) | |
1614 | { | |
f7f3461d | 1615 | int error = 0; |
8a82472f | 1616 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1617 | char *class_name; |
1618 | ||
1619 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1620 | if (!class_name) { | |
cb360bbf | 1621 | error = -ENOMEM; |
8a82472f CH |
1622 | goto out; |
1623 | } | |
1624 | if (old_parent) { | |
1625 | sysfs_remove_link(&dev->kobj, "device"); | |
1626 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1627 | } | |
c744aeae CH |
1628 | if (new_parent) { |
1629 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1630 | "device"); | |
1631 | if (error) | |
1632 | goto out; | |
1633 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1634 | class_name); | |
1635 | if (error) | |
1636 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1637 | } else |
c744aeae | 1638 | error = 0; |
8a82472f CH |
1639 | out: |
1640 | kfree(class_name); | |
1641 | return error; | |
1642 | #else | |
f7f3461d GKH |
1643 | if (old_parent) |
1644 | sysfs_remove_link(&dev->kobj, "device"); | |
1645 | if (new_parent) | |
1646 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1647 | "device"); | |
1648 | return error; | |
8a82472f CH |
1649 | #endif |
1650 | } | |
1651 | ||
1652 | /** | |
1653 | * device_move - moves a device to a new parent | |
1654 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1655 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1656 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1657 | */ |
ffa6a705 CH |
1658 | int device_move(struct device *dev, struct device *new_parent, |
1659 | enum dpm_order dpm_order) | |
8a82472f CH |
1660 | { |
1661 | int error; | |
1662 | struct device *old_parent; | |
c744aeae | 1663 | struct kobject *new_parent_kobj; |
8a82472f CH |
1664 | |
1665 | dev = get_device(dev); | |
1666 | if (!dev) | |
1667 | return -EINVAL; | |
1668 | ||
ffa6a705 | 1669 | device_pm_lock(); |
8a82472f | 1670 | new_parent = get_device(new_parent); |
4a3ad20c | 1671 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1672 | |
1e0b2cf9 KS |
1673 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1674 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1675 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1676 | if (error) { |
63b6971a | 1677 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1678 | put_device(new_parent); |
1679 | goto out; | |
1680 | } | |
1681 | old_parent = dev->parent; | |
1682 | dev->parent = new_parent; | |
1683 | if (old_parent) | |
f791b8c8 | 1684 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1685 | if (new_parent) { |
f791b8c8 GKH |
1686 | klist_add_tail(&dev->p->knode_parent, |
1687 | &new_parent->p->klist_children); | |
0d358f22 YL |
1688 | set_dev_node(dev, dev_to_node(new_parent)); |
1689 | } | |
1690 | ||
8a82472f CH |
1691 | if (!dev->class) |
1692 | goto out_put; | |
1693 | error = device_move_class_links(dev, old_parent, new_parent); | |
1694 | if (error) { | |
1695 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1696 | device_move_class_links(dev, new_parent, old_parent); | |
1697 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae | 1698 | if (new_parent) |
f791b8c8 | 1699 | klist_remove(&dev->p->knode_parent); |
0d358f22 YL |
1700 | dev->parent = old_parent; |
1701 | if (old_parent) { | |
f791b8c8 GKH |
1702 | klist_add_tail(&dev->p->knode_parent, |
1703 | &old_parent->p->klist_children); | |
0d358f22 YL |
1704 | set_dev_node(dev, dev_to_node(old_parent)); |
1705 | } | |
8a82472f | 1706 | } |
63b6971a | 1707 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1708 | put_device(new_parent); |
1709 | goto out; | |
1710 | } | |
ffa6a705 CH |
1711 | switch (dpm_order) { |
1712 | case DPM_ORDER_NONE: | |
1713 | break; | |
1714 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1715 | device_pm_move_after(dev, new_parent); | |
1716 | break; | |
1717 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1718 | device_pm_move_before(new_parent, dev); | |
1719 | break; | |
1720 | case DPM_ORDER_DEV_LAST: | |
1721 | device_pm_move_last(dev); | |
1722 | break; | |
1723 | } | |
8a82472f CH |
1724 | out_put: |
1725 | put_device(old_parent); | |
1726 | out: | |
ffa6a705 | 1727 | device_pm_unlock(); |
8a82472f CH |
1728 | put_device(dev); |
1729 | return error; | |
1730 | } | |
8a82472f | 1731 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1732 | |
1733 | /** | |
1734 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1735 | */ | |
1736 | void device_shutdown(void) | |
1737 | { | |
4a3ad20c | 1738 | struct device *dev, *devn; |
37b0c020 GKH |
1739 | |
1740 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1741 | kobj.entry) { | |
1742 | if (dev->bus && dev->bus->shutdown) { | |
1743 | dev_dbg(dev, "shutdown\n"); | |
1744 | dev->bus->shutdown(dev); | |
1745 | } else if (dev->driver && dev->driver->shutdown) { | |
1746 | dev_dbg(dev, "shutdown\n"); | |
1747 | dev->driver->shutdown(dev); | |
1748 | } | |
1749 | } | |
401097ea | 1750 | async_synchronize_full(); |
37b0c020 | 1751 | } |