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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
23681e47 | 19 | #include <linux/kdev_t.h> |
116af378 | 20 | #include <linux/notifier.h> |
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 | ||
103 | static struct sysfs_ops dev_sysfs_ops = { | |
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 | ||
312c004d KS |
255 | static struct kset_uevent_ops device_uevent_ops = { |
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 | ||
5c5daf65 | 309 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
310 | kobject_uevent(&dev->kobj, action); |
311 | goto out; | |
312 | } | |
313 | ||
314 | dev_err(dev, "uevent: unsupported action-string; this will " | |
315 | "be ignored in a future kernel version\n"); | |
312c004d | 316 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 317 | out: |
a7fd6706 KS |
318 | return count; |
319 | } | |
320 | ||
ad6a1e1c TH |
321 | static struct device_attribute uevent_attr = |
322 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
323 | ||
621a1672 DT |
324 | static int device_add_attributes(struct device *dev, |
325 | struct device_attribute *attrs) | |
de0ff00d | 326 | { |
621a1672 | 327 | int error = 0; |
de0ff00d | 328 | int i; |
621a1672 DT |
329 | |
330 | if (attrs) { | |
331 | for (i = 0; attr_name(attrs[i]); i++) { | |
332 | error = device_create_file(dev, &attrs[i]); | |
333 | if (error) | |
334 | break; | |
335 | } | |
336 | if (error) | |
337 | while (--i >= 0) | |
338 | device_remove_file(dev, &attrs[i]); | |
339 | } | |
340 | return error; | |
341 | } | |
342 | ||
343 | static void device_remove_attributes(struct device *dev, | |
344 | struct device_attribute *attrs) | |
345 | { | |
346 | int i; | |
347 | ||
348 | if (attrs) | |
349 | for (i = 0; attr_name(attrs[i]); i++) | |
350 | device_remove_file(dev, &attrs[i]); | |
351 | } | |
352 | ||
353 | static int device_add_groups(struct device *dev, | |
a4dbd674 | 354 | const struct attribute_group **groups) |
621a1672 | 355 | { |
de0ff00d | 356 | int error = 0; |
621a1672 | 357 | int i; |
de0ff00d | 358 | |
621a1672 DT |
359 | if (groups) { |
360 | for (i = 0; groups[i]; i++) { | |
361 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
362 | if (error) { |
363 | while (--i >= 0) | |
4a3ad20c GKH |
364 | sysfs_remove_group(&dev->kobj, |
365 | groups[i]); | |
621a1672 | 366 | break; |
de0ff00d GKH |
367 | } |
368 | } | |
369 | } | |
de0ff00d GKH |
370 | return error; |
371 | } | |
372 | ||
621a1672 | 373 | static void device_remove_groups(struct device *dev, |
a4dbd674 | 374 | const struct attribute_group **groups) |
de0ff00d GKH |
375 | { |
376 | int i; | |
621a1672 DT |
377 | |
378 | if (groups) | |
379 | for (i = 0; groups[i]; i++) | |
380 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
381 | } |
382 | ||
2620efef GKH |
383 | static int device_add_attrs(struct device *dev) |
384 | { | |
385 | struct class *class = dev->class; | |
f9f852df | 386 | struct device_type *type = dev->type; |
621a1672 | 387 | int error; |
2620efef | 388 | |
621a1672 DT |
389 | if (class) { |
390 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 391 | if (error) |
621a1672 | 392 | return error; |
2620efef | 393 | } |
f9f852df | 394 | |
621a1672 DT |
395 | if (type) { |
396 | error = device_add_groups(dev, type->groups); | |
f9f852df | 397 | if (error) |
621a1672 | 398 | goto err_remove_class_attrs; |
f9f852df KS |
399 | } |
400 | ||
621a1672 DT |
401 | error = device_add_groups(dev, dev->groups); |
402 | if (error) | |
403 | goto err_remove_type_groups; | |
404 | ||
405 | return 0; | |
406 | ||
407 | err_remove_type_groups: | |
408 | if (type) | |
409 | device_remove_groups(dev, type->groups); | |
410 | err_remove_class_attrs: | |
411 | if (class) | |
412 | device_remove_attributes(dev, class->dev_attrs); | |
413 | ||
2620efef GKH |
414 | return error; |
415 | } | |
416 | ||
417 | static void device_remove_attrs(struct device *dev) | |
418 | { | |
419 | struct class *class = dev->class; | |
f9f852df | 420 | struct device_type *type = dev->type; |
2620efef | 421 | |
621a1672 | 422 | device_remove_groups(dev, dev->groups); |
f9f852df | 423 | |
621a1672 DT |
424 | if (type) |
425 | device_remove_groups(dev, type->groups); | |
426 | ||
427 | if (class) | |
428 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
429 | } |
430 | ||
431 | ||
23681e47 GKH |
432 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
433 | char *buf) | |
434 | { | |
435 | return print_dev_t(buf, dev->devt); | |
436 | } | |
437 | ||
ad6a1e1c TH |
438 | static struct device_attribute devt_attr = |
439 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
440 | ||
881c6cfd GKH |
441 | /* kset to create /sys/devices/ */ |
442 | struct kset *devices_kset; | |
1da177e4 | 443 | |
1da177e4 | 444 | /** |
4a3ad20c GKH |
445 | * device_create_file - create sysfs attribute file for device. |
446 | * @dev: device. | |
447 | * @attr: device attribute descriptor. | |
1da177e4 | 448 | */ |
26579ab7 PC |
449 | int device_create_file(struct device *dev, |
450 | const struct device_attribute *attr) | |
1da177e4 LT |
451 | { |
452 | int error = 0; | |
0c98b19f | 453 | if (dev) |
1da177e4 | 454 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
455 | return error; |
456 | } | |
457 | ||
458 | /** | |
4a3ad20c GKH |
459 | * device_remove_file - remove sysfs attribute file. |
460 | * @dev: device. | |
461 | * @attr: device attribute descriptor. | |
1da177e4 | 462 | */ |
26579ab7 PC |
463 | void device_remove_file(struct device *dev, |
464 | const struct device_attribute *attr) | |
1da177e4 | 465 | { |
0c98b19f | 466 | if (dev) |
1da177e4 | 467 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
468 | } |
469 | ||
2589f188 GKH |
470 | /** |
471 | * device_create_bin_file - create sysfs binary attribute file for device. | |
472 | * @dev: device. | |
473 | * @attr: device binary attribute descriptor. | |
474 | */ | |
66ecb92b PC |
475 | int device_create_bin_file(struct device *dev, |
476 | const struct bin_attribute *attr) | |
2589f188 GKH |
477 | { |
478 | int error = -EINVAL; | |
479 | if (dev) | |
480 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
481 | return error; | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
484 | ||
485 | /** | |
486 | * device_remove_bin_file - remove sysfs binary attribute file | |
487 | * @dev: device. | |
488 | * @attr: device binary attribute descriptor. | |
489 | */ | |
66ecb92b PC |
490 | void device_remove_bin_file(struct device *dev, |
491 | const struct bin_attribute *attr) | |
2589f188 GKH |
492 | { |
493 | if (dev) | |
494 | sysfs_remove_bin_file(&dev->kobj, attr); | |
495 | } | |
496 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
497 | ||
d9a9cdfb | 498 | /** |
523ded71 | 499 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
500 | * @dev: device. |
501 | * @func: callback function to invoke later. | |
523ded71 | 502 | * @owner: module owning the callback routine |
d9a9cdfb AS |
503 | * |
504 | * Attribute methods must not unregister themselves or their parent device | |
505 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
506 | * since unregistration is mutually exclusive with driver callbacks. | |
507 | * | |
508 | * Instead methods can call this routine, which will attempt to allocate | |
509 | * and schedule a workqueue request to call back @func with @dev as its | |
510 | * argument in the workqueue's process context. @dev will be pinned until | |
511 | * @func returns. | |
512 | * | |
523ded71 AS |
513 | * This routine is usually called via the inline device_schedule_callback(), |
514 | * which automatically sets @owner to THIS_MODULE. | |
515 | * | |
d9a9cdfb | 516 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 517 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
518 | * |
519 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
520 | * underlying sysfs routine (since it is intended for use by attribute | |
521 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
522 | */ | |
523ded71 AS |
523 | int device_schedule_callback_owner(struct device *dev, |
524 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
525 | { |
526 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 527 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 528 | } |
523ded71 | 529 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 530 | |
34bb61f9 JB |
531 | static void klist_children_get(struct klist_node *n) |
532 | { | |
f791b8c8 GKH |
533 | struct device_private *p = to_device_private_parent(n); |
534 | struct device *dev = p->device; | |
34bb61f9 JB |
535 | |
536 | get_device(dev); | |
537 | } | |
538 | ||
539 | static void klist_children_put(struct klist_node *n) | |
540 | { | |
f791b8c8 GKH |
541 | struct device_private *p = to_device_private_parent(n); |
542 | struct device *dev = p->device; | |
34bb61f9 JB |
543 | |
544 | put_device(dev); | |
545 | } | |
546 | ||
1da177e4 | 547 | /** |
4a3ad20c GKH |
548 | * device_initialize - init device structure. |
549 | * @dev: device. | |
1da177e4 | 550 | * |
5739411a CH |
551 | * This prepares the device for use by other layers by initializing |
552 | * its fields. | |
4a3ad20c | 553 | * It is the first half of device_register(), if called by |
5739411a CH |
554 | * that function, though it can also be called separately, so one |
555 | * may use @dev's fields. In particular, get_device()/put_device() | |
556 | * may be used for reference counting of @dev after calling this | |
557 | * function. | |
558 | * | |
559 | * NOTE: Use put_device() to give up your reference instead of freeing | |
560 | * @dev directly once you have called this function. | |
1da177e4 | 561 | */ |
1da177e4 LT |
562 | void device_initialize(struct device *dev) |
563 | { | |
881c6cfd | 564 | dev->kobj.kset = devices_kset; |
f9cb074b | 565 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 566 | INIT_LIST_HEAD(&dev->dma_pools); |
af70316a | 567 | init_MUTEX(&dev->sem); |
9ac7849e TH |
568 | spin_lock_init(&dev->devres_lock); |
569 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 570 | device_init_wakeup(dev, 0); |
3b98aeaf | 571 | device_pm_init(dev); |
87348136 | 572 | set_dev_node(dev, -1); |
1da177e4 LT |
573 | } |
574 | ||
40fa5422 | 575 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
576 | static struct kobject *get_device_parent(struct device *dev, |
577 | struct device *parent) | |
40fa5422 | 578 | { |
da231fd5 | 579 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 580 | if (dev->class && (!parent || parent->class != dev->class)) |
1fbfee6c | 581 | return &dev->class->p->class_subsys.kobj; |
da231fd5 | 582 | /* all other devices keep their parent */ |
40fa5422 | 583 | else if (parent) |
c744aeae | 584 | return &parent->kobj; |
40fa5422 | 585 | |
c744aeae | 586 | return NULL; |
40fa5422 | 587 | } |
da231fd5 KS |
588 | |
589 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
590 | static inline void cleanup_glue_dir(struct device *dev, |
591 | struct kobject *glue_dir) {} | |
40fa5422 | 592 | #else |
86406245 | 593 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 594 | { |
86406245 | 595 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 596 | |
86406245 | 597 | if (!virtual_dir) |
4ff6abff | 598 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 599 | &devices_kset->kobj); |
f0ee61a6 | 600 | |
86406245 | 601 | return virtual_dir; |
f0ee61a6 GKH |
602 | } |
603 | ||
da231fd5 KS |
604 | static struct kobject *get_device_parent(struct device *dev, |
605 | struct device *parent) | |
40fa5422 | 606 | { |
43968d2f GKH |
607 | int retval; |
608 | ||
86406245 | 609 | if (dev->class) { |
77d3d7c1 | 610 | static DEFINE_MUTEX(gdp_mutex); |
86406245 KS |
611 | struct kobject *kobj = NULL; |
612 | struct kobject *parent_kobj; | |
613 | struct kobject *k; | |
614 | ||
615 | /* | |
616 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
617 | * Class-devices with a non class-device as parent, live |
618 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
619 | */ |
620 | if (parent == NULL) | |
621 | parent_kobj = virtual_device_parent(dev); | |
622 | else if (parent->class) | |
623 | return &parent->kobj; | |
624 | else | |
625 | parent_kobj = &parent->kobj; | |
626 | ||
77d3d7c1 TH |
627 | mutex_lock(&gdp_mutex); |
628 | ||
86406245 | 629 | /* find our class-directory at the parent and reference it */ |
7c71448b GKH |
630 | spin_lock(&dev->class->p->class_dirs.list_lock); |
631 | list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) | |
86406245 KS |
632 | if (k->parent == parent_kobj) { |
633 | kobj = kobject_get(k); | |
634 | break; | |
635 | } | |
7c71448b | 636 | spin_unlock(&dev->class->p->class_dirs.list_lock); |
77d3d7c1 TH |
637 | if (kobj) { |
638 | mutex_unlock(&gdp_mutex); | |
86406245 | 639 | return kobj; |
77d3d7c1 | 640 | } |
86406245 KS |
641 | |
642 | /* or create a new class-directory at the parent device */ | |
43968d2f | 643 | k = kobject_create(); |
77d3d7c1 TH |
644 | if (!k) { |
645 | mutex_unlock(&gdp_mutex); | |
43968d2f | 646 | return NULL; |
77d3d7c1 | 647 | } |
7c71448b | 648 | k->kset = &dev->class->p->class_dirs; |
b2d6db58 | 649 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f | 650 | if (retval < 0) { |
77d3d7c1 | 651 | mutex_unlock(&gdp_mutex); |
43968d2f GKH |
652 | kobject_put(k); |
653 | return NULL; | |
654 | } | |
0f4dafc0 | 655 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 656 | mutex_unlock(&gdp_mutex); |
43968d2f | 657 | return k; |
86406245 KS |
658 | } |
659 | ||
660 | if (parent) | |
c744aeae CH |
661 | return &parent->kobj; |
662 | return NULL; | |
663 | } | |
da231fd5 | 664 | |
63b6971a | 665 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 666 | { |
0f4dafc0 | 667 | /* see if we live in a "glue" directory */ |
c1fe539a | 668 | if (!glue_dir || !dev->class || |
7c71448b | 669 | glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5 KS |
670 | return; |
671 | ||
0f4dafc0 | 672 | kobject_put(glue_dir); |
da231fd5 | 673 | } |
63b6971a CH |
674 | |
675 | static void cleanup_device_parent(struct device *dev) | |
676 | { | |
677 | cleanup_glue_dir(dev, dev->kobj.parent); | |
678 | } | |
c744aeae | 679 | #endif |
86406245 | 680 | |
63b6971a | 681 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
682 | { |
683 | struct kobject *kobj; | |
684 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
685 | if (kobj) |
686 | dev->kobj.parent = kobj; | |
40fa5422 | 687 | } |
40fa5422 | 688 | |
2ee97caf CH |
689 | static int device_add_class_symlinks(struct device *dev) |
690 | { | |
691 | int error; | |
692 | ||
693 | if (!dev->class) | |
694 | return 0; | |
da231fd5 | 695 | |
1fbfee6c GKH |
696 | error = sysfs_create_link(&dev->kobj, |
697 | &dev->class->p->class_subsys.kobj, | |
2ee97caf CH |
698 | "subsystem"); |
699 | if (error) | |
700 | goto out; | |
da231fd5 KS |
701 | |
702 | #ifdef CONFIG_SYSFS_DEPRECATED | |
703 | /* stacked class devices need a symlink in the class directory */ | |
1fbfee6c | 704 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 705 | device_is_not_partition(dev)) { |
1fbfee6c | 706 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 707 | &dev->kobj, dev_name(dev)); |
2ee97caf CH |
708 | if (error) |
709 | goto out_subsys; | |
710 | } | |
da231fd5 | 711 | |
4e886c29 | 712 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
713 | struct device *parent = dev->parent; |
714 | char *class_name; | |
4f01a757 | 715 | |
da231fd5 KS |
716 | /* |
717 | * stacked class devices have the 'device' link | |
718 | * pointing to the bus device instead of the parent | |
719 | */ | |
720 | while (parent->class && !parent->bus && parent->parent) | |
721 | parent = parent->parent; | |
722 | ||
723 | error = sysfs_create_link(&dev->kobj, | |
724 | &parent->kobj, | |
4f01a757 DT |
725 | "device"); |
726 | if (error) | |
727 | goto out_busid; | |
da231fd5 KS |
728 | |
729 | class_name = make_class_name(dev->class->name, | |
730 | &dev->kobj); | |
731 | if (class_name) | |
732 | error = sysfs_create_link(&dev->parent->kobj, | |
733 | &dev->kobj, class_name); | |
734 | kfree(class_name); | |
735 | if (error) | |
736 | goto out_device; | |
2ee97caf CH |
737 | } |
738 | return 0; | |
739 | ||
2ee97caf | 740 | out_device: |
4e886c29 | 741 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 742 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 743 | out_busid: |
1fbfee6c | 744 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 745 | device_is_not_partition(dev)) |
1fbfee6c | 746 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 747 | dev_name(dev)); |
da231fd5 KS |
748 | #else |
749 | /* link in the class directory pointing to the device */ | |
1fbfee6c | 750 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 751 | &dev->kobj, dev_name(dev)); |
da231fd5 KS |
752 | if (error) |
753 | goto out_subsys; | |
754 | ||
4e886c29 | 755 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
756 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
757 | "device"); | |
758 | if (error) | |
759 | goto out_busid; | |
760 | } | |
761 | return 0; | |
762 | ||
763 | out_busid: | |
1e0b2cf9 | 764 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
765 | #endif |
766 | ||
2ee97caf CH |
767 | out_subsys: |
768 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
769 | out: | |
770 | return error; | |
771 | } | |
772 | ||
773 | static void device_remove_class_symlinks(struct device *dev) | |
774 | { | |
775 | if (!dev->class) | |
776 | return; | |
da231fd5 | 777 | |
2ee97caf | 778 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 779 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
780 | char *class_name; |
781 | ||
782 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
783 | if (class_name) { | |
784 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
785 | kfree(class_name); | |
786 | } | |
2ee97caf CH |
787 | sysfs_remove_link(&dev->kobj, "device"); |
788 | } | |
da231fd5 | 789 | |
1fbfee6c | 790 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 791 | device_is_not_partition(dev)) |
1fbfee6c | 792 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 793 | dev_name(dev)); |
da231fd5 | 794 | #else |
4e886c29 | 795 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
796 | sysfs_remove_link(&dev->kobj, "device"); |
797 | ||
1e0b2cf9 | 798 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); |
da231fd5 KS |
799 | #endif |
800 | ||
2ee97caf CH |
801 | sysfs_remove_link(&dev->kobj, "subsystem"); |
802 | } | |
803 | ||
413c239f SR |
804 | /** |
805 | * dev_set_name - set a device name | |
806 | * @dev: device | |
46232366 | 807 | * @fmt: format string for the device's name |
413c239f SR |
808 | */ |
809 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
810 | { | |
811 | va_list vargs; | |
1fa5ae85 | 812 | int err; |
413c239f SR |
813 | |
814 | va_start(vargs, fmt); | |
1fa5ae85 | 815 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 816 | va_end(vargs); |
1fa5ae85 | 817 | return err; |
413c239f SR |
818 | } |
819 | EXPORT_SYMBOL_GPL(dev_set_name); | |
820 | ||
e105b8bf DW |
821 | /** |
822 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
823 | * @dev: device | |
824 | * | |
825 | * By default we select char/ for new entries. Setting class->dev_obj | |
826 | * to NULL prevents an entry from being created. class->dev_kobj must | |
827 | * be set (or cleared) before any devices are registered to the class | |
828 | * otherwise device_create_sys_dev_entry() and | |
829 | * device_remove_sys_dev_entry() will disagree about the the presence | |
830 | * of the link. | |
831 | */ | |
832 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
833 | { | |
834 | struct kobject *kobj; | |
835 | ||
836 | if (dev->class) | |
837 | kobj = dev->class->dev_kobj; | |
838 | else | |
839 | kobj = sysfs_dev_char_kobj; | |
840 | ||
841 | return kobj; | |
842 | } | |
843 | ||
844 | static int device_create_sys_dev_entry(struct device *dev) | |
845 | { | |
846 | struct kobject *kobj = device_to_dev_kobj(dev); | |
847 | int error = 0; | |
848 | char devt_str[15]; | |
849 | ||
850 | if (kobj) { | |
851 | format_dev_t(devt_str, dev->devt); | |
852 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
853 | } | |
854 | ||
855 | return error; | |
856 | } | |
857 | ||
858 | static void device_remove_sys_dev_entry(struct device *dev) | |
859 | { | |
860 | struct kobject *kobj = device_to_dev_kobj(dev); | |
861 | char devt_str[15]; | |
862 | ||
863 | if (kobj) { | |
864 | format_dev_t(devt_str, dev->devt); | |
865 | sysfs_remove_link(kobj, devt_str); | |
866 | } | |
867 | } | |
868 | ||
b4028437 GKH |
869 | int device_private_init(struct device *dev) |
870 | { | |
871 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
872 | if (!dev->p) | |
873 | return -ENOMEM; | |
874 | dev->p->device = dev; | |
875 | klist_init(&dev->p->klist_children, klist_children_get, | |
876 | klist_children_put); | |
877 | return 0; | |
878 | } | |
879 | ||
1da177e4 | 880 | /** |
4a3ad20c GKH |
881 | * device_add - add device to device hierarchy. |
882 | * @dev: device. | |
1da177e4 | 883 | * |
4a3ad20c GKH |
884 | * This is part 2 of device_register(), though may be called |
885 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 886 | * |
5739411a | 887 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
888 | * to the global and sibling lists for the device, then |
889 | * adds it to the other relevant subsystems of the driver model. | |
5739411a CH |
890 | * |
891 | * NOTE: _Never_ directly free @dev after calling this function, even | |
892 | * if it returned an error! Always use put_device() to give up your | |
893 | * reference instead. | |
1da177e4 LT |
894 | */ |
895 | int device_add(struct device *dev) | |
896 | { | |
897 | struct device *parent = NULL; | |
c47ed219 | 898 | struct class_interface *class_intf; |
c906a48a | 899 | int error = -EINVAL; |
775b64d2 | 900 | |
1da177e4 | 901 | dev = get_device(dev); |
c906a48a GKH |
902 | if (!dev) |
903 | goto done; | |
904 | ||
fb069a5d | 905 | if (!dev->p) { |
b4028437 GKH |
906 | error = device_private_init(dev); |
907 | if (error) | |
908 | goto done; | |
fb069a5d | 909 | } |
fb069a5d | 910 | |
1fa5ae85 KS |
911 | /* |
912 | * for statically allocated devices, which should all be converted | |
913 | * some day, we need to initialize the name. We prevent reading back | |
914 | * the name, and force the use of dev_name() | |
915 | */ | |
916 | if (dev->init_name) { | |
acc0e90f | 917 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
918 | dev->init_name = NULL; |
919 | } | |
c906a48a | 920 | |
e6309e75 TG |
921 | if (!dev_name(dev)) { |
922 | error = -EINVAL; | |
5c8563d7 | 923 | goto name_error; |
e6309e75 | 924 | } |
1da177e4 | 925 | |
1e0b2cf9 | 926 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 927 | |
1da177e4 | 928 | parent = get_device(dev->parent); |
63b6971a | 929 | setup_parent(dev, parent); |
1da177e4 | 930 | |
0d358f22 YL |
931 | /* use parent numa_node */ |
932 | if (parent) | |
933 | set_dev_node(dev, dev_to_node(parent)); | |
934 | ||
1da177e4 | 935 | /* first, register with generic layer. */ |
8a577ffc KS |
936 | /* we require the name to be set before, and pass NULL */ |
937 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 938 | if (error) |
1da177e4 | 939 | goto Error; |
a7fd6706 | 940 | |
37022644 BW |
941 | /* notify platform of device entry */ |
942 | if (platform_notify) | |
943 | platform_notify(dev); | |
944 | ||
ad6a1e1c | 945 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
946 | if (error) |
947 | goto attrError; | |
a7fd6706 | 948 | |
23681e47 | 949 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
950 | error = device_create_file(dev, &devt_attr); |
951 | if (error) | |
a306eea4 | 952 | goto ueventattrError; |
e105b8bf DW |
953 | |
954 | error = device_create_sys_dev_entry(dev); | |
955 | if (error) | |
956 | goto devtattrError; | |
2b2af54a KS |
957 | |
958 | devtmpfs_create_node(dev); | |
23681e47 GKH |
959 | } |
960 | ||
2ee97caf CH |
961 | error = device_add_class_symlinks(dev); |
962 | if (error) | |
963 | goto SymlinkError; | |
dc0afa83 CH |
964 | error = device_add_attrs(dev); |
965 | if (error) | |
2620efef | 966 | goto AttrsError; |
dc0afa83 CH |
967 | error = bus_add_device(dev); |
968 | if (error) | |
1da177e4 | 969 | goto BusError; |
3b98aeaf | 970 | error = dpm_sysfs_add(dev); |
57eee3d2 | 971 | if (error) |
3b98aeaf AS |
972 | goto DPMError; |
973 | device_pm_add(dev); | |
ec0676ee AS |
974 | |
975 | /* Notify clients of device addition. This call must come | |
976 | * after dpm_sysf_add() and before kobject_uevent(). | |
977 | */ | |
978 | if (dev->bus) | |
979 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
980 | BUS_NOTIFY_ADD_DEVICE, dev); | |
981 | ||
83b5fb4c | 982 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 983 | bus_probe_device(dev); |
1da177e4 | 984 | if (parent) |
f791b8c8 GKH |
985 | klist_add_tail(&dev->p->knode_parent, |
986 | &parent->p->klist_children); | |
1da177e4 | 987 | |
5d9fd169 | 988 | if (dev->class) { |
f75b1c60 | 989 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 990 | /* tie the class to the device */ |
5a3ceb86 TH |
991 | klist_add_tail(&dev->knode_class, |
992 | &dev->class->p->class_devices); | |
c47ed219 GKH |
993 | |
994 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
995 | list_for_each_entry(class_intf, |
996 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
997 | if (class_intf->add_dev) |
998 | class_intf->add_dev(dev, class_intf); | |
f75b1c60 | 999 | mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169 | 1000 | } |
c906a48a | 1001 | done: |
1da177e4 LT |
1002 | put_device(dev); |
1003 | return error; | |
3b98aeaf | 1004 | DPMError: |
57eee3d2 RW |
1005 | bus_remove_device(dev); |
1006 | BusError: | |
82f0cf9b | 1007 | device_remove_attrs(dev); |
2620efef | 1008 | AttrsError: |
2ee97caf CH |
1009 | device_remove_class_symlinks(dev); |
1010 | SymlinkError: | |
ad72956d KS |
1011 | if (MAJOR(dev->devt)) |
1012 | devtmpfs_delete_node(dev); | |
e105b8bf DW |
1013 | if (MAJOR(dev->devt)) |
1014 | device_remove_sys_dev_entry(dev); | |
1015 | devtattrError: | |
ad6a1e1c TH |
1016 | if (MAJOR(dev->devt)) |
1017 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 1018 | ueventattrError: |
ad6a1e1c | 1019 | device_remove_file(dev, &uevent_attr); |
23681e47 | 1020 | attrError: |
312c004d | 1021 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
1022 | kobject_del(&dev->kobj); |
1023 | Error: | |
63b6971a | 1024 | cleanup_device_parent(dev); |
1da177e4 LT |
1025 | if (parent) |
1026 | put_device(parent); | |
5c8563d7 KS |
1027 | name_error: |
1028 | kfree(dev->p); | |
1029 | dev->p = NULL; | |
c906a48a | 1030 | goto done; |
1da177e4 LT |
1031 | } |
1032 | ||
1da177e4 | 1033 | /** |
4a3ad20c GKH |
1034 | * device_register - register a device with the system. |
1035 | * @dev: pointer to the device structure | |
1da177e4 | 1036 | * |
4a3ad20c GKH |
1037 | * This happens in two clean steps - initialize the device |
1038 | * and add it to the system. The two steps can be called | |
1039 | * separately, but this is the easiest and most common. | |
1040 | * I.e. you should only call the two helpers separately if | |
1041 | * have a clearly defined need to use and refcount the device | |
1042 | * before it is added to the hierarchy. | |
5739411a CH |
1043 | * |
1044 | * NOTE: _Never_ directly free @dev after calling this function, even | |
1045 | * if it returned an error! Always use put_device() to give up the | |
1046 | * reference initialized in this function instead. | |
1da177e4 | 1047 | */ |
1da177e4 LT |
1048 | int device_register(struct device *dev) |
1049 | { | |
1050 | device_initialize(dev); | |
1051 | return device_add(dev); | |
1052 | } | |
1053 | ||
1da177e4 | 1054 | /** |
4a3ad20c GKH |
1055 | * get_device - increment reference count for device. |
1056 | * @dev: device. | |
1da177e4 | 1057 | * |
4a3ad20c GKH |
1058 | * This simply forwards the call to kobject_get(), though |
1059 | * we do take care to provide for the case that we get a NULL | |
1060 | * pointer passed in. | |
1da177e4 | 1061 | */ |
4a3ad20c | 1062 | struct device *get_device(struct device *dev) |
1da177e4 LT |
1063 | { |
1064 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
1065 | } | |
1066 | ||
1da177e4 | 1067 | /** |
4a3ad20c GKH |
1068 | * put_device - decrement reference count. |
1069 | * @dev: device in question. | |
1da177e4 | 1070 | */ |
4a3ad20c | 1071 | void put_device(struct device *dev) |
1da177e4 | 1072 | { |
edfaa7c3 | 1073 | /* might_sleep(); */ |
1da177e4 LT |
1074 | if (dev) |
1075 | kobject_put(&dev->kobj); | |
1076 | } | |
1077 | ||
1da177e4 | 1078 | /** |
4a3ad20c GKH |
1079 | * device_del - delete device from system. |
1080 | * @dev: device. | |
1da177e4 | 1081 | * |
4a3ad20c GKH |
1082 | * This is the first part of the device unregistration |
1083 | * sequence. This removes the device from the lists we control | |
1084 | * from here, has it removed from the other driver model | |
1085 | * subsystems it was added to in device_add(), and removes it | |
1086 | * from the kobject hierarchy. | |
1da177e4 | 1087 | * |
4a3ad20c GKH |
1088 | * NOTE: this should be called manually _iff_ device_add() was |
1089 | * also called manually. | |
1da177e4 | 1090 | */ |
4a3ad20c | 1091 | void device_del(struct device *dev) |
1da177e4 | 1092 | { |
4a3ad20c | 1093 | struct device *parent = dev->parent; |
c47ed219 | 1094 | struct class_interface *class_intf; |
1da177e4 | 1095 | |
ec0676ee AS |
1096 | /* Notify clients of device removal. This call must come |
1097 | * before dpm_sysfs_remove(). | |
1098 | */ | |
1099 | if (dev->bus) | |
1100 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1101 | BUS_NOTIFY_DEL_DEVICE, dev); | |
775b64d2 | 1102 | device_pm_remove(dev); |
3b98aeaf | 1103 | dpm_sysfs_remove(dev); |
1da177e4 | 1104 | if (parent) |
f791b8c8 | 1105 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1106 | if (MAJOR(dev->devt)) { |
2b2af54a | 1107 | devtmpfs_delete_node(dev); |
e105b8bf | 1108 | device_remove_sys_dev_entry(dev); |
ad6a1e1c | 1109 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1110 | } |
b9d9c82b | 1111 | if (dev->class) { |
da231fd5 | 1112 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1113 | |
f75b1c60 | 1114 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 1115 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1116 | list_for_each_entry(class_intf, |
1117 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1118 | if (class_intf->remove_dev) |
1119 | class_intf->remove_dev(dev, class_intf); | |
1120 | /* remove the device from the class list */ | |
5a3ceb86 | 1121 | klist_del(&dev->knode_class); |
f75b1c60 | 1122 | mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b | 1123 | } |
ad6a1e1c | 1124 | device_remove_file(dev, &uevent_attr); |
2620efef | 1125 | device_remove_attrs(dev); |
28953533 | 1126 | bus_remove_device(dev); |
1da177e4 | 1127 | |
2f8d16a9 TH |
1128 | /* |
1129 | * Some platform devices are driven without driver attached | |
1130 | * and managed resources may have been acquired. Make sure | |
1131 | * all resources are released. | |
1132 | */ | |
1133 | devres_release_all(dev); | |
1134 | ||
1da177e4 LT |
1135 | /* Notify the platform of the removal, in case they |
1136 | * need to do anything... | |
1137 | */ | |
1138 | if (platform_notify_remove) | |
1139 | platform_notify_remove(dev); | |
312c004d | 1140 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1141 | cleanup_device_parent(dev); |
1da177e4 | 1142 | kobject_del(&dev->kobj); |
da231fd5 | 1143 | put_device(parent); |
1da177e4 LT |
1144 | } |
1145 | ||
1146 | /** | |
4a3ad20c GKH |
1147 | * device_unregister - unregister device from system. |
1148 | * @dev: device going away. | |
1da177e4 | 1149 | * |
4a3ad20c GKH |
1150 | * We do this in two parts, like we do device_register(). First, |
1151 | * we remove it from all the subsystems with device_del(), then | |
1152 | * we decrement the reference count via put_device(). If that | |
1153 | * is the final reference count, the device will be cleaned up | |
1154 | * via device_release() above. Otherwise, the structure will | |
1155 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1156 | */ |
4a3ad20c | 1157 | void device_unregister(struct device *dev) |
1da177e4 | 1158 | { |
1e0b2cf9 | 1159 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1160 | device_del(dev); |
1161 | put_device(dev); | |
1162 | } | |
1163 | ||
4a3ad20c | 1164 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1165 | { |
4a3ad20c | 1166 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1167 | struct device *dev = NULL; |
1168 | struct device_private *p; | |
1169 | ||
1170 | if (n) { | |
1171 | p = to_device_private_parent(n); | |
1172 | dev = p->device; | |
1173 | } | |
1174 | return dev; | |
36239577 PM |
1175 | } |
1176 | ||
6fcf53ac | 1177 | /** |
e454cea2 | 1178 | * device_get_devnode - path of device node file |
6fcf53ac | 1179 | * @dev: device |
e454cea2 | 1180 | * @mode: returned file access mode |
6fcf53ac KS |
1181 | * @tmp: possibly allocated string |
1182 | * | |
1183 | * Return the relative path of a possible device node. | |
1184 | * Non-default names may need to allocate a memory to compose | |
1185 | * a name. This memory is returned in tmp and needs to be | |
1186 | * freed by the caller. | |
1187 | */ | |
e454cea2 KS |
1188 | const char *device_get_devnode(struct device *dev, |
1189 | mode_t *mode, const char **tmp) | |
6fcf53ac KS |
1190 | { |
1191 | char *s; | |
1192 | ||
1193 | *tmp = NULL; | |
1194 | ||
1195 | /* the device type may provide a specific name */ | |
e454cea2 KS |
1196 | if (dev->type && dev->type->devnode) |
1197 | *tmp = dev->type->devnode(dev, mode); | |
6fcf53ac KS |
1198 | if (*tmp) |
1199 | return *tmp; | |
1200 | ||
1201 | /* the class may provide a specific name */ | |
e454cea2 KS |
1202 | if (dev->class && dev->class->devnode) |
1203 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1204 | if (*tmp) |
1205 | return *tmp; | |
1206 | ||
1207 | /* return name without allocation, tmp == NULL */ | |
1208 | if (strchr(dev_name(dev), '!') == NULL) | |
1209 | return dev_name(dev); | |
1210 | ||
1211 | /* replace '!' in the name with '/' */ | |
1212 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1213 | if (!*tmp) | |
1214 | return NULL; | |
1215 | while ((s = strchr(*tmp, '!'))) | |
1216 | s[0] = '/'; | |
1217 | return *tmp; | |
1218 | } | |
1219 | ||
1da177e4 | 1220 | /** |
4a3ad20c GKH |
1221 | * device_for_each_child - device child iterator. |
1222 | * @parent: parent struct device. | |
1223 | * @data: data for the callback. | |
1224 | * @fn: function to be called for each device. | |
1da177e4 | 1225 | * |
4a3ad20c GKH |
1226 | * Iterate over @parent's child devices, and call @fn for each, |
1227 | * passing it @data. | |
1da177e4 | 1228 | * |
4a3ad20c GKH |
1229 | * We check the return of @fn each time. If it returns anything |
1230 | * other than 0, we break out and return that value. | |
1da177e4 | 1231 | */ |
4a3ad20c GKH |
1232 | int device_for_each_child(struct device *parent, void *data, |
1233 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1234 | { |
36239577 | 1235 | struct klist_iter i; |
4a3ad20c | 1236 | struct device *child; |
1da177e4 LT |
1237 | int error = 0; |
1238 | ||
014c90db GKH |
1239 | if (!parent->p) |
1240 | return 0; | |
1241 | ||
f791b8c8 | 1242 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 PM |
1243 | while ((child = next_device(&i)) && !error) |
1244 | error = fn(child, data); | |
1245 | klist_iter_exit(&i); | |
1da177e4 LT |
1246 | return error; |
1247 | } | |
1248 | ||
5ab69981 CH |
1249 | /** |
1250 | * device_find_child - device iterator for locating a particular device. | |
1251 | * @parent: parent struct device | |
1252 | * @data: Data to pass to match function | |
1253 | * @match: Callback function to check device | |
1254 | * | |
1255 | * This is similar to the device_for_each_child() function above, but it | |
1256 | * returns a reference to a device that is 'found' for later use, as | |
1257 | * determined by the @match callback. | |
1258 | * | |
1259 | * The callback should return 0 if the device doesn't match and non-zero | |
1260 | * if it does. If the callback returns non-zero and a reference to the | |
1261 | * current device can be obtained, this function will return to the caller | |
1262 | * and not iterate over any more devices. | |
1263 | */ | |
4a3ad20c GKH |
1264 | struct device *device_find_child(struct device *parent, void *data, |
1265 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1266 | { |
1267 | struct klist_iter i; | |
1268 | struct device *child; | |
1269 | ||
1270 | if (!parent) | |
1271 | return NULL; | |
1272 | ||
f791b8c8 | 1273 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1274 | while ((child = next_device(&i))) |
1275 | if (match(child, data) && get_device(child)) | |
1276 | break; | |
1277 | klist_iter_exit(&i); | |
1278 | return child; | |
1279 | } | |
1280 | ||
1da177e4 LT |
1281 | int __init devices_init(void) |
1282 | { | |
881c6cfd GKH |
1283 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1284 | if (!devices_kset) | |
1285 | return -ENOMEM; | |
e105b8bf DW |
1286 | dev_kobj = kobject_create_and_add("dev", NULL); |
1287 | if (!dev_kobj) | |
1288 | goto dev_kobj_err; | |
1289 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1290 | if (!sysfs_dev_block_kobj) | |
1291 | goto block_kobj_err; | |
1292 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1293 | if (!sysfs_dev_char_kobj) | |
1294 | goto char_kobj_err; | |
1295 | ||
881c6cfd | 1296 | return 0; |
e105b8bf DW |
1297 | |
1298 | char_kobj_err: | |
1299 | kobject_put(sysfs_dev_block_kobj); | |
1300 | block_kobj_err: | |
1301 | kobject_put(dev_kobj); | |
1302 | dev_kobj_err: | |
1303 | kset_unregister(devices_kset); | |
1304 | return -ENOMEM; | |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1308 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1309 | |
1310 | EXPORT_SYMBOL_GPL(device_initialize); | |
1311 | EXPORT_SYMBOL_GPL(device_add); | |
1312 | EXPORT_SYMBOL_GPL(device_register); | |
1313 | ||
1314 | EXPORT_SYMBOL_GPL(device_del); | |
1315 | EXPORT_SYMBOL_GPL(device_unregister); | |
1316 | EXPORT_SYMBOL_GPL(get_device); | |
1317 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1318 | |
1319 | EXPORT_SYMBOL_GPL(device_create_file); | |
1320 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 | 1321 | |
0aa0dc41 MM |
1322 | struct root_device |
1323 | { | |
1324 | struct device dev; | |
1325 | struct module *owner; | |
1326 | }; | |
1327 | ||
1328 | #define to_root_device(dev) container_of(dev, struct root_device, dev) | |
1329 | ||
1330 | static void root_device_release(struct device *dev) | |
1331 | { | |
1332 | kfree(to_root_device(dev)); | |
1333 | } | |
1334 | ||
1335 | /** | |
1336 | * __root_device_register - allocate and register a root device | |
1337 | * @name: root device name | |
1338 | * @owner: owner module of the root device, usually THIS_MODULE | |
1339 | * | |
1340 | * This function allocates a root device and registers it | |
1341 | * using device_register(). In order to free the returned | |
1342 | * device, use root_device_unregister(). | |
1343 | * | |
1344 | * Root devices are dummy devices which allow other devices | |
1345 | * to be grouped under /sys/devices. Use this function to | |
1346 | * allocate a root device and then use it as the parent of | |
1347 | * any device which should appear under /sys/devices/{name} | |
1348 | * | |
1349 | * The /sys/devices/{name} directory will also contain a | |
1350 | * 'module' symlink which points to the @owner directory | |
1351 | * in sysfs. | |
1352 | * | |
1353 | * Note: You probably want to use root_device_register(). | |
1354 | */ | |
1355 | struct device *__root_device_register(const char *name, struct module *owner) | |
1356 | { | |
1357 | struct root_device *root; | |
1358 | int err = -ENOMEM; | |
1359 | ||
1360 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1361 | if (!root) | |
1362 | return ERR_PTR(err); | |
1363 | ||
acc0e90f | 1364 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1365 | if (err) { |
1366 | kfree(root); | |
1367 | return ERR_PTR(err); | |
1368 | } | |
1369 | ||
1370 | root->dev.release = root_device_release; | |
1371 | ||
1372 | err = device_register(&root->dev); | |
1373 | if (err) { | |
1374 | put_device(&root->dev); | |
1375 | return ERR_PTR(err); | |
1376 | } | |
1377 | ||
1378 | #ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */ | |
1379 | if (owner) { | |
1380 | struct module_kobject *mk = &owner->mkobj; | |
1381 | ||
1382 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1383 | if (err) { | |
1384 | device_unregister(&root->dev); | |
1385 | return ERR_PTR(err); | |
1386 | } | |
1387 | root->owner = owner; | |
1388 | } | |
1389 | #endif | |
1390 | ||
1391 | return &root->dev; | |
1392 | } | |
1393 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1394 | ||
1395 | /** | |
1396 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1397 | * @dev: device going away |
0aa0dc41 MM |
1398 | * |
1399 | * This function unregisters and cleans up a device that was created by | |
1400 | * root_device_register(). | |
1401 | */ | |
1402 | void root_device_unregister(struct device *dev) | |
1403 | { | |
1404 | struct root_device *root = to_root_device(dev); | |
1405 | ||
1406 | if (root->owner) | |
1407 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1408 | ||
1409 | device_unregister(dev); | |
1410 | } | |
1411 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1412 | ||
23681e47 GKH |
1413 | |
1414 | static void device_create_release(struct device *dev) | |
1415 | { | |
1e0b2cf9 | 1416 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1417 | kfree(dev); |
1418 | } | |
1419 | ||
1420 | /** | |
8882b394 | 1421 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1422 | * @class: pointer to the struct class that this device should be registered to |
1423 | * @parent: pointer to the parent struct device of this new device, if any | |
1424 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1425 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1426 | * @fmt: string for the device's name |
8882b394 | 1427 | * @args: va_list for the device's name |
42734daf HK |
1428 | * |
1429 | * This function can be used by char device classes. A struct device | |
1430 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1431 | * |
23681e47 GKH |
1432 | * A "dev" file will be created, showing the dev_t for the device, if |
1433 | * the dev_t is not 0,0. | |
42734daf HK |
1434 | * If a pointer to a parent struct device is passed in, the newly created |
1435 | * struct device will be a child of that device in sysfs. | |
1436 | * The pointer to the struct device will be returned from the call. | |
1437 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1438 | * pointer. |
1439 | * | |
1440 | * Note: the struct class passed to this function must have previously | |
1441 | * been created with a call to class_create(). | |
1442 | */ | |
8882b394 GKH |
1443 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1444 | dev_t devt, void *drvdata, const char *fmt, | |
1445 | va_list args) | |
23681e47 | 1446 | { |
23681e47 GKH |
1447 | struct device *dev = NULL; |
1448 | int retval = -ENODEV; | |
1449 | ||
1450 | if (class == NULL || IS_ERR(class)) | |
1451 | goto error; | |
23681e47 GKH |
1452 | |
1453 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1454 | if (!dev) { | |
1455 | retval = -ENOMEM; | |
1456 | goto error; | |
1457 | } | |
1458 | ||
1459 | dev->devt = devt; | |
1460 | dev->class = class; | |
1461 | dev->parent = parent; | |
1462 | dev->release = device_create_release; | |
8882b394 | 1463 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1464 | |
1fa5ae85 KS |
1465 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1466 | if (retval) | |
1467 | goto error; | |
1468 | ||
23681e47 GKH |
1469 | retval = device_register(dev); |
1470 | if (retval) | |
1471 | goto error; | |
1472 | ||
23681e47 GKH |
1473 | return dev; |
1474 | ||
1475 | error: | |
286661b3 | 1476 | put_device(dev); |
23681e47 GKH |
1477 | return ERR_PTR(retval); |
1478 | } | |
8882b394 GKH |
1479 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1480 | ||
1481 | /** | |
4e106739 | 1482 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1483 | * @class: pointer to the struct class that this device should be registered to |
1484 | * @parent: pointer to the parent struct device of this new device, if any | |
1485 | * @devt: the dev_t for the char device to be added | |
1486 | * @drvdata: the data to be added to the device for callbacks | |
1487 | * @fmt: string for the device's name | |
1488 | * | |
1489 | * This function can be used by char device classes. A struct device | |
1490 | * will be created in sysfs, registered to the specified class. | |
1491 | * | |
1492 | * A "dev" file will be created, showing the dev_t for the device, if | |
1493 | * the dev_t is not 0,0. | |
1494 | * If a pointer to a parent struct device is passed in, the newly created | |
1495 | * struct device will be a child of that device in sysfs. | |
1496 | * The pointer to the struct device will be returned from the call. | |
1497 | * Any further sysfs files that might be required can be created using this | |
1498 | * pointer. | |
1499 | * | |
1500 | * Note: the struct class passed to this function must have previously | |
1501 | * been created with a call to class_create(). | |
1502 | */ | |
4e106739 GKH |
1503 | struct device *device_create(struct class *class, struct device *parent, |
1504 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1505 | { |
1506 | va_list vargs; | |
1507 | struct device *dev; | |
1508 | ||
1509 | va_start(vargs, fmt); | |
1510 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1511 | va_end(vargs); | |
1512 | return dev; | |
1513 | } | |
4e106739 | 1514 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1515 | |
cd35449b | 1516 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1517 | { |
cd35449b | 1518 | dev_t *devt = data; |
23681e47 | 1519 | |
cd35449b | 1520 | return dev->devt == *devt; |
775b64d2 RW |
1521 | } |
1522 | ||
1523 | /** | |
1524 | * device_destroy - removes a device that was created with device_create() | |
1525 | * @class: pointer to the struct class that this device was registered with | |
1526 | * @devt: the dev_t of the device that was previously registered | |
1527 | * | |
1528 | * This call unregisters and cleans up a device that was created with a | |
1529 | * call to device_create(). | |
1530 | */ | |
1531 | void device_destroy(struct class *class, dev_t devt) | |
1532 | { | |
1533 | struct device *dev; | |
23681e47 | 1534 | |
695794ae | 1535 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1536 | if (dev) { |
1537 | put_device(dev); | |
23681e47 | 1538 | device_unregister(dev); |
cd35449b | 1539 | } |
23681e47 GKH |
1540 | } |
1541 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1542 | |
1543 | /** | |
1544 | * device_rename - renames a device | |
1545 | * @dev: the pointer to the struct device to be renamed | |
1546 | * @new_name: the new name of the device | |
030c1d2b EB |
1547 | * |
1548 | * It is the responsibility of the caller to provide mutual | |
1549 | * exclusion between two different calls of device_rename | |
1550 | * on the same device to ensure that new_name is valid and | |
1551 | * won't conflict with other devices. | |
a2de48ca GKH |
1552 | */ |
1553 | int device_rename(struct device *dev, char *new_name) | |
1554 | { | |
1555 | char *old_class_name = NULL; | |
1556 | char *new_class_name = NULL; | |
2ee97caf | 1557 | char *old_device_name = NULL; |
a2de48ca GKH |
1558 | int error; |
1559 | ||
1560 | dev = get_device(dev); | |
1561 | if (!dev) | |
1562 | return -EINVAL; | |
1563 | ||
1e0b2cf9 | 1564 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1565 | __func__, new_name); |
a2de48ca | 1566 | |
99ef3ef8 | 1567 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1568 | if ((dev->class) && (dev->parent)) |
1569 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1570 | #endif |
a2de48ca | 1571 | |
1fa5ae85 | 1572 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1573 | if (!old_device_name) { |
1574 | error = -ENOMEM; | |
1575 | goto out; | |
a2de48ca | 1576 | } |
a2de48ca GKH |
1577 | |
1578 | error = kobject_rename(&dev->kobj, new_name); | |
1fa5ae85 | 1579 | if (error) |
2ee97caf | 1580 | goto out; |
a2de48ca | 1581 | |
99ef3ef8 | 1582 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1583 | if (old_class_name) { |
1584 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1585 | if (new_class_name) { | |
36ce6dad CH |
1586 | error = sysfs_create_link_nowarn(&dev->parent->kobj, |
1587 | &dev->kobj, | |
1588 | new_class_name); | |
2ee97caf CH |
1589 | if (error) |
1590 | goto out; | |
a2de48ca GKH |
1591 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1592 | } | |
1593 | } | |
60b8cabd | 1594 | #else |
a2de48ca | 1595 | if (dev->class) { |
36ce6dad | 1596 | error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 1597 | &dev->kobj, dev_name(dev)); |
0599ad53 SH |
1598 | if (error) |
1599 | goto out; | |
1fbfee6c | 1600 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
7c71448b | 1601 | old_device_name); |
a2de48ca | 1602 | } |
60b8cabd KS |
1603 | #endif |
1604 | ||
2ee97caf | 1605 | out: |
a2de48ca GKH |
1606 | put_device(dev); |
1607 | ||
a2de48ca | 1608 | kfree(new_class_name); |
952ab431 | 1609 | kfree(old_class_name); |
2ee97caf | 1610 | kfree(old_device_name); |
a2de48ca GKH |
1611 | |
1612 | return error; | |
1613 | } | |
a2807dbc | 1614 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1615 | |
1616 | static int device_move_class_links(struct device *dev, | |
1617 | struct device *old_parent, | |
1618 | struct device *new_parent) | |
1619 | { | |
f7f3461d | 1620 | int error = 0; |
8a82472f | 1621 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1622 | char *class_name; |
1623 | ||
1624 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1625 | if (!class_name) { | |
cb360bbf | 1626 | error = -ENOMEM; |
8a82472f CH |
1627 | goto out; |
1628 | } | |
1629 | if (old_parent) { | |
1630 | sysfs_remove_link(&dev->kobj, "device"); | |
1631 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1632 | } | |
c744aeae CH |
1633 | if (new_parent) { |
1634 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1635 | "device"); | |
1636 | if (error) | |
1637 | goto out; | |
1638 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1639 | class_name); | |
1640 | if (error) | |
1641 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1642 | } else |
c744aeae | 1643 | error = 0; |
8a82472f CH |
1644 | out: |
1645 | kfree(class_name); | |
1646 | return error; | |
1647 | #else | |
f7f3461d GKH |
1648 | if (old_parent) |
1649 | sysfs_remove_link(&dev->kobj, "device"); | |
1650 | if (new_parent) | |
1651 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1652 | "device"); | |
1653 | return error; | |
8a82472f CH |
1654 | #endif |
1655 | } | |
1656 | ||
1657 | /** | |
1658 | * device_move - moves a device to a new parent | |
1659 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1660 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1661 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1662 | */ |
ffa6a705 CH |
1663 | int device_move(struct device *dev, struct device *new_parent, |
1664 | enum dpm_order dpm_order) | |
8a82472f CH |
1665 | { |
1666 | int error; | |
1667 | struct device *old_parent; | |
c744aeae | 1668 | struct kobject *new_parent_kobj; |
8a82472f CH |
1669 | |
1670 | dev = get_device(dev); | |
1671 | if (!dev) | |
1672 | return -EINVAL; | |
1673 | ||
ffa6a705 | 1674 | device_pm_lock(); |
8a82472f | 1675 | new_parent = get_device(new_parent); |
4a3ad20c | 1676 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1677 | |
1e0b2cf9 KS |
1678 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1679 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1680 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1681 | if (error) { |
63b6971a | 1682 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1683 | put_device(new_parent); |
1684 | goto out; | |
1685 | } | |
1686 | old_parent = dev->parent; | |
1687 | dev->parent = new_parent; | |
1688 | if (old_parent) | |
f791b8c8 | 1689 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1690 | if (new_parent) { |
f791b8c8 GKH |
1691 | klist_add_tail(&dev->p->knode_parent, |
1692 | &new_parent->p->klist_children); | |
0d358f22 YL |
1693 | set_dev_node(dev, dev_to_node(new_parent)); |
1694 | } | |
1695 | ||
8a82472f CH |
1696 | if (!dev->class) |
1697 | goto out_put; | |
1698 | error = device_move_class_links(dev, old_parent, new_parent); | |
1699 | if (error) { | |
1700 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1701 | device_move_class_links(dev, new_parent, old_parent); | |
1702 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae | 1703 | if (new_parent) |
f791b8c8 | 1704 | klist_remove(&dev->p->knode_parent); |
0d358f22 YL |
1705 | dev->parent = old_parent; |
1706 | if (old_parent) { | |
f791b8c8 GKH |
1707 | klist_add_tail(&dev->p->knode_parent, |
1708 | &old_parent->p->klist_children); | |
0d358f22 YL |
1709 | set_dev_node(dev, dev_to_node(old_parent)); |
1710 | } | |
8a82472f | 1711 | } |
63b6971a | 1712 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1713 | put_device(new_parent); |
1714 | goto out; | |
1715 | } | |
ffa6a705 CH |
1716 | switch (dpm_order) { |
1717 | case DPM_ORDER_NONE: | |
1718 | break; | |
1719 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1720 | device_pm_move_after(dev, new_parent); | |
1721 | break; | |
1722 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1723 | device_pm_move_before(new_parent, dev); | |
1724 | break; | |
1725 | case DPM_ORDER_DEV_LAST: | |
1726 | device_pm_move_last(dev); | |
1727 | break; | |
1728 | } | |
8a82472f CH |
1729 | out_put: |
1730 | put_device(old_parent); | |
1731 | out: | |
ffa6a705 | 1732 | device_pm_unlock(); |
8a82472f CH |
1733 | put_device(dev); |
1734 | return error; | |
1735 | } | |
8a82472f | 1736 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1737 | |
1738 | /** | |
1739 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1740 | */ | |
1741 | void device_shutdown(void) | |
1742 | { | |
4a3ad20c | 1743 | struct device *dev, *devn; |
37b0c020 GKH |
1744 | |
1745 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1746 | kobj.entry) { | |
1747 | if (dev->bus && dev->bus->shutdown) { | |
1748 | dev_dbg(dev, "shutdown\n"); | |
1749 | dev->bus->shutdown(dev); | |
1750 | } else if (dev->driver && dev->driver->shutdown) { | |
1751 | dev_dbg(dev, "shutdown\n"); | |
1752 | dev->driver->shutdown(dev); | |
1753 | } | |
1754 | } | |
401097ea | 1755 | async_synchronize_full(); |
37b0c020 | 1756 | } |