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> |
f75b1c60 | 23 | #include <linux/mutex.h> |
401097ea | 24 | #include <linux/async.h> |
1da177e4 LT |
25 | |
26 | #include "base.h" | |
27 | #include "power/power.h" | |
28 | ||
e52eec13 AK |
29 | #ifdef CONFIG_SYSFS_DEPRECATED |
30 | #ifdef CONFIG_SYSFS_DEPRECATED_V2 | |
31 | long sysfs_deprecated = 1; | |
32 | #else | |
33 | long sysfs_deprecated = 0; | |
34 | #endif | |
35 | static __init int sysfs_deprecated_setup(char *arg) | |
36 | { | |
37 | return strict_strtol(arg, 10, &sysfs_deprecated); | |
38 | } | |
39 | early_param("sysfs.deprecated", sysfs_deprecated_setup); | |
40 | #endif | |
41 | ||
4a3ad20c GKH |
42 | int (*platform_notify)(struct device *dev) = NULL; |
43 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
44 | static struct kobject *dev_kobj; |
45 | struct kobject *sysfs_dev_char_kobj; | |
46 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 47 | |
4e886c29 GKH |
48 | #ifdef CONFIG_BLOCK |
49 | static inline int device_is_not_partition(struct device *dev) | |
50 | { | |
51 | return !(dev->type == &part_type); | |
52 | } | |
53 | #else | |
54 | static inline int device_is_not_partition(struct device *dev) | |
55 | { | |
56 | return 1; | |
57 | } | |
58 | #endif | |
1da177e4 | 59 | |
3e95637a AS |
60 | /** |
61 | * dev_driver_string - Return a device's driver name, if at all possible | |
62 | * @dev: struct device to get the name of | |
63 | * | |
64 | * Will return the device's driver's name if it is bound to a device. If | |
65 | * the device is not bound to a device, it will return the name of the bus | |
66 | * it is attached to. If it is not attached to a bus either, an empty | |
67 | * string will be returned. | |
68 | */ | |
bf9ca69f | 69 | const char *dev_driver_string(const struct device *dev) |
3e95637a | 70 | { |
3589972e AS |
71 | struct device_driver *drv; |
72 | ||
73 | /* dev->driver can change to NULL underneath us because of unbinding, | |
74 | * so be careful about accessing it. dev->bus and dev->class should | |
75 | * never change once they are set, so they don't need special care. | |
76 | */ | |
77 | drv = ACCESS_ONCE(dev->driver); | |
78 | return drv ? drv->name : | |
a456b702 JD |
79 | (dev->bus ? dev->bus->name : |
80 | (dev->class ? dev->class->name : "")); | |
3e95637a | 81 | } |
310a922d | 82 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 83 | |
1da177e4 LT |
84 | #define to_dev(obj) container_of(obj, struct device, kobj) |
85 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
86 | ||
4a3ad20c GKH |
87 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
88 | char *buf) | |
1da177e4 | 89 | { |
4a3ad20c GKH |
90 | struct device_attribute *dev_attr = to_dev_attr(attr); |
91 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 92 | ssize_t ret = -EIO; |
1da177e4 LT |
93 | |
94 | if (dev_attr->show) | |
54b6f35c | 95 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
96 | if (ret >= (ssize_t)PAGE_SIZE) { |
97 | print_symbol("dev_attr_show: %s returned bad count\n", | |
98 | (unsigned long)dev_attr->show); | |
99 | } | |
1da177e4 LT |
100 | return ret; |
101 | } | |
102 | ||
4a3ad20c GKH |
103 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
104 | const char *buf, size_t count) | |
1da177e4 | 105 | { |
4a3ad20c GKH |
106 | struct device_attribute *dev_attr = to_dev_attr(attr); |
107 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 108 | ssize_t ret = -EIO; |
1da177e4 LT |
109 | |
110 | if (dev_attr->store) | |
54b6f35c | 111 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
112 | return ret; |
113 | } | |
114 | ||
52cf25d0 | 115 | static const struct sysfs_ops dev_sysfs_ops = { |
1da177e4 LT |
116 | .show = dev_attr_show, |
117 | .store = dev_attr_store, | |
118 | }; | |
119 | ||
120 | ||
121 | /** | |
122 | * device_release - free device structure. | |
123 | * @kobj: device's kobject. | |
124 | * | |
125 | * This is called once the reference count for the object | |
126 | * reaches 0. We forward the call to the device's release | |
127 | * method, which should handle actually freeing the structure. | |
128 | */ | |
4a3ad20c | 129 | static void device_release(struct kobject *kobj) |
1da177e4 | 130 | { |
4a3ad20c | 131 | struct device *dev = to_dev(kobj); |
fb069a5d | 132 | struct device_private *p = dev->p; |
1da177e4 LT |
133 | |
134 | if (dev->release) | |
135 | dev->release(dev); | |
f9f852df KS |
136 | else if (dev->type && dev->type->release) |
137 | dev->type->release(dev); | |
2620efef GKH |
138 | else if (dev->class && dev->class->dev_release) |
139 | dev->class->dev_release(dev); | |
f810a5cf AV |
140 | else |
141 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 142 | "function, it is broken and must be fixed.\n", |
1e0b2cf9 | 143 | dev_name(dev)); |
fb069a5d | 144 | kfree(p); |
1da177e4 LT |
145 | } |
146 | ||
bc451f20 EB |
147 | static const void *device_namespace(struct kobject *kobj) |
148 | { | |
149 | struct device *dev = to_dev(kobj); | |
150 | const void *ns = NULL; | |
151 | ||
152 | if (dev->class && dev->class->ns_type) | |
153 | ns = dev->class->namespace(dev); | |
154 | ||
155 | return ns; | |
156 | } | |
157 | ||
8f4afc41 | 158 | static struct kobj_type device_ktype = { |
1da177e4 LT |
159 | .release = device_release, |
160 | .sysfs_ops = &dev_sysfs_ops, | |
bc451f20 | 161 | .namespace = device_namespace, |
1da177e4 LT |
162 | }; |
163 | ||
164 | ||
312c004d | 165 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
166 | { |
167 | struct kobj_type *ktype = get_ktype(kobj); | |
168 | ||
8f4afc41 | 169 | if (ktype == &device_ktype) { |
1da177e4 LT |
170 | struct device *dev = to_dev(kobj); |
171 | if (dev->bus) | |
172 | return 1; | |
23681e47 GKH |
173 | if (dev->class) |
174 | return 1; | |
1da177e4 LT |
175 | } |
176 | return 0; | |
177 | } | |
178 | ||
312c004d | 179 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
180 | { |
181 | struct device *dev = to_dev(kobj); | |
182 | ||
23681e47 GKH |
183 | if (dev->bus) |
184 | return dev->bus->name; | |
185 | if (dev->class) | |
186 | return dev->class->name; | |
187 | return NULL; | |
1da177e4 LT |
188 | } |
189 | ||
7eff2e7a KS |
190 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
191 | struct kobj_uevent_env *env) | |
1da177e4 LT |
192 | { |
193 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
194 | int retval = 0; |
195 | ||
6fcf53ac | 196 | /* add device node properties if present */ |
23681e47 | 197 | if (MAJOR(dev->devt)) { |
6fcf53ac KS |
198 | const char *tmp; |
199 | const char *name; | |
e454cea2 | 200 | mode_t mode = 0; |
6fcf53ac | 201 | |
7eff2e7a KS |
202 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
203 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
e454cea2 | 204 | name = device_get_devnode(dev, &mode, &tmp); |
6fcf53ac KS |
205 | if (name) { |
206 | add_uevent_var(env, "DEVNAME=%s", name); | |
207 | kfree(tmp); | |
e454cea2 KS |
208 | if (mode) |
209 | add_uevent_var(env, "DEVMODE=%#o", mode & 0777); | |
6fcf53ac | 210 | } |
23681e47 GKH |
211 | } |
212 | ||
414264f9 | 213 | if (dev->type && dev->type->name) |
7eff2e7a | 214 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 215 | |
239378f1 | 216 | if (dev->driver) |
7eff2e7a | 217 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 218 | |
7eff2e7a | 219 | /* have the bus specific function add its stuff */ |
312c004d | 220 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 221 | retval = dev->bus->uevent(dev, env); |
f9f852df | 222 | if (retval) |
7dc72b28 | 223 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
1e0b2cf9 | 224 | dev_name(dev), __func__, retval); |
1da177e4 LT |
225 | } |
226 | ||
7eff2e7a | 227 | /* have the class specific function add its stuff */ |
2620efef | 228 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 229 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 230 | if (retval) |
7dc72b28 | 231 | pr_debug("device: '%s': %s: class uevent() " |
1e0b2cf9 | 232 | "returned %d\n", dev_name(dev), |
2b3a302a | 233 | __func__, retval); |
f9f852df KS |
234 | } |
235 | ||
eef35c2d | 236 | /* have the device type specific function add its stuff */ |
f9f852df | 237 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 238 | retval = dev->type->uevent(dev, env); |
f9f852df | 239 | if (retval) |
7dc72b28 | 240 | pr_debug("device: '%s': %s: dev_type uevent() " |
1e0b2cf9 | 241 | "returned %d\n", dev_name(dev), |
2b3a302a | 242 | __func__, retval); |
2620efef GKH |
243 | } |
244 | ||
1da177e4 LT |
245 | return retval; |
246 | } | |
247 | ||
9cd43611 | 248 | static const struct kset_uevent_ops device_uevent_ops = { |
312c004d KS |
249 | .filter = dev_uevent_filter, |
250 | .name = dev_uevent_name, | |
251 | .uevent = dev_uevent, | |
1da177e4 LT |
252 | }; |
253 | ||
16574dcc KS |
254 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
255 | char *buf) | |
256 | { | |
257 | struct kobject *top_kobj; | |
258 | struct kset *kset; | |
7eff2e7a | 259 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
260 | int i; |
261 | size_t count = 0; | |
262 | int retval; | |
263 | ||
264 | /* search the kset, the device belongs to */ | |
265 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
266 | while (!top_kobj->kset && top_kobj->parent) |
267 | top_kobj = top_kobj->parent; | |
16574dcc KS |
268 | if (!top_kobj->kset) |
269 | goto out; | |
5c5daf65 | 270 | |
16574dcc KS |
271 | kset = top_kobj->kset; |
272 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
273 | goto out; | |
274 | ||
275 | /* respect filter */ | |
276 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
277 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
278 | goto out; | |
279 | ||
7eff2e7a KS |
280 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
281 | if (!env) | |
c7308c81 GKH |
282 | return -ENOMEM; |
283 | ||
16574dcc | 284 | /* let the kset specific function add its keys */ |
7eff2e7a | 285 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
286 | if (retval) |
287 | goto out; | |
288 | ||
289 | /* copy keys to file */ | |
7eff2e7a KS |
290 | for (i = 0; i < env->envp_idx; i++) |
291 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 292 | out: |
7eff2e7a | 293 | kfree(env); |
16574dcc KS |
294 | return count; |
295 | } | |
296 | ||
a7fd6706 KS |
297 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
298 | const char *buf, size_t count) | |
299 | { | |
60a96a59 KS |
300 | enum kobject_action action; |
301 | ||
3f5468c9 | 302 | if (kobject_action_type(buf, count, &action) == 0) |
60a96a59 | 303 | kobject_uevent(&dev->kobj, action); |
3f5468c9 KS |
304 | else |
305 | dev_err(dev, "uevent: unknown action-string\n"); | |
a7fd6706 KS |
306 | return count; |
307 | } | |
308 | ||
ad6a1e1c TH |
309 | static struct device_attribute uevent_attr = |
310 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
311 | ||
621a1672 DT |
312 | static int device_add_attributes(struct device *dev, |
313 | struct device_attribute *attrs) | |
de0ff00d | 314 | { |
621a1672 | 315 | int error = 0; |
de0ff00d | 316 | int i; |
621a1672 DT |
317 | |
318 | if (attrs) { | |
319 | for (i = 0; attr_name(attrs[i]); i++) { | |
320 | error = device_create_file(dev, &attrs[i]); | |
321 | if (error) | |
322 | break; | |
323 | } | |
324 | if (error) | |
325 | while (--i >= 0) | |
326 | device_remove_file(dev, &attrs[i]); | |
327 | } | |
328 | return error; | |
329 | } | |
330 | ||
331 | static void device_remove_attributes(struct device *dev, | |
332 | struct device_attribute *attrs) | |
333 | { | |
334 | int i; | |
335 | ||
336 | if (attrs) | |
337 | for (i = 0; attr_name(attrs[i]); i++) | |
338 | device_remove_file(dev, &attrs[i]); | |
339 | } | |
340 | ||
341 | static int device_add_groups(struct device *dev, | |
a4dbd674 | 342 | const struct attribute_group **groups) |
621a1672 | 343 | { |
de0ff00d | 344 | int error = 0; |
621a1672 | 345 | int i; |
de0ff00d | 346 | |
621a1672 DT |
347 | if (groups) { |
348 | for (i = 0; groups[i]; i++) { | |
349 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
350 | if (error) { |
351 | while (--i >= 0) | |
4a3ad20c GKH |
352 | sysfs_remove_group(&dev->kobj, |
353 | groups[i]); | |
621a1672 | 354 | break; |
de0ff00d GKH |
355 | } |
356 | } | |
357 | } | |
de0ff00d GKH |
358 | return error; |
359 | } | |
360 | ||
621a1672 | 361 | static void device_remove_groups(struct device *dev, |
a4dbd674 | 362 | const struct attribute_group **groups) |
de0ff00d GKH |
363 | { |
364 | int i; | |
621a1672 DT |
365 | |
366 | if (groups) | |
367 | for (i = 0; groups[i]; i++) | |
368 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
369 | } |
370 | ||
2620efef GKH |
371 | static int device_add_attrs(struct device *dev) |
372 | { | |
373 | struct class *class = dev->class; | |
f9f852df | 374 | struct device_type *type = dev->type; |
621a1672 | 375 | int error; |
2620efef | 376 | |
621a1672 DT |
377 | if (class) { |
378 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 379 | if (error) |
621a1672 | 380 | return error; |
2620efef | 381 | } |
f9f852df | 382 | |
621a1672 DT |
383 | if (type) { |
384 | error = device_add_groups(dev, type->groups); | |
f9f852df | 385 | if (error) |
621a1672 | 386 | goto err_remove_class_attrs; |
f9f852df KS |
387 | } |
388 | ||
621a1672 DT |
389 | error = device_add_groups(dev, dev->groups); |
390 | if (error) | |
391 | goto err_remove_type_groups; | |
392 | ||
393 | return 0; | |
394 | ||
395 | err_remove_type_groups: | |
396 | if (type) | |
397 | device_remove_groups(dev, type->groups); | |
398 | err_remove_class_attrs: | |
399 | if (class) | |
400 | device_remove_attributes(dev, class->dev_attrs); | |
401 | ||
2620efef GKH |
402 | return error; |
403 | } | |
404 | ||
405 | static void device_remove_attrs(struct device *dev) | |
406 | { | |
407 | struct class *class = dev->class; | |
f9f852df | 408 | struct device_type *type = dev->type; |
2620efef | 409 | |
621a1672 | 410 | device_remove_groups(dev, dev->groups); |
f9f852df | 411 | |
621a1672 DT |
412 | if (type) |
413 | device_remove_groups(dev, type->groups); | |
414 | ||
415 | if (class) | |
416 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
417 | } |
418 | ||
419 | ||
23681e47 GKH |
420 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
421 | char *buf) | |
422 | { | |
423 | return print_dev_t(buf, dev->devt); | |
424 | } | |
425 | ||
ad6a1e1c TH |
426 | static struct device_attribute devt_attr = |
427 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
428 | ||
881c6cfd GKH |
429 | /* kset to create /sys/devices/ */ |
430 | struct kset *devices_kset; | |
1da177e4 | 431 | |
1da177e4 | 432 | /** |
4a3ad20c GKH |
433 | * device_create_file - create sysfs attribute file for device. |
434 | * @dev: device. | |
435 | * @attr: device attribute descriptor. | |
1da177e4 | 436 | */ |
26579ab7 PC |
437 | int device_create_file(struct device *dev, |
438 | const struct device_attribute *attr) | |
1da177e4 LT |
439 | { |
440 | int error = 0; | |
0c98b19f | 441 | if (dev) |
1da177e4 | 442 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
443 | return error; |
444 | } | |
445 | ||
446 | /** | |
4a3ad20c GKH |
447 | * device_remove_file - remove sysfs attribute file. |
448 | * @dev: device. | |
449 | * @attr: device attribute descriptor. | |
1da177e4 | 450 | */ |
26579ab7 PC |
451 | void device_remove_file(struct device *dev, |
452 | const struct device_attribute *attr) | |
1da177e4 | 453 | { |
0c98b19f | 454 | if (dev) |
1da177e4 | 455 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
456 | } |
457 | ||
2589f188 GKH |
458 | /** |
459 | * device_create_bin_file - create sysfs binary attribute file for device. | |
460 | * @dev: device. | |
461 | * @attr: device binary attribute descriptor. | |
462 | */ | |
66ecb92b PC |
463 | int device_create_bin_file(struct device *dev, |
464 | const struct bin_attribute *attr) | |
2589f188 GKH |
465 | { |
466 | int error = -EINVAL; | |
467 | if (dev) | |
468 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
469 | return error; | |
470 | } | |
471 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
472 | ||
473 | /** | |
474 | * device_remove_bin_file - remove sysfs binary attribute file | |
475 | * @dev: device. | |
476 | * @attr: device binary attribute descriptor. | |
477 | */ | |
66ecb92b PC |
478 | void device_remove_bin_file(struct device *dev, |
479 | const struct bin_attribute *attr) | |
2589f188 GKH |
480 | { |
481 | if (dev) | |
482 | sysfs_remove_bin_file(&dev->kobj, attr); | |
483 | } | |
484 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
485 | ||
d9a9cdfb | 486 | /** |
523ded71 | 487 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
488 | * @dev: device. |
489 | * @func: callback function to invoke later. | |
523ded71 | 490 | * @owner: module owning the callback routine |
d9a9cdfb AS |
491 | * |
492 | * Attribute methods must not unregister themselves or their parent device | |
493 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
494 | * since unregistration is mutually exclusive with driver callbacks. | |
495 | * | |
496 | * Instead methods can call this routine, which will attempt to allocate | |
497 | * and schedule a workqueue request to call back @func with @dev as its | |
498 | * argument in the workqueue's process context. @dev will be pinned until | |
499 | * @func returns. | |
500 | * | |
523ded71 AS |
501 | * This routine is usually called via the inline device_schedule_callback(), |
502 | * which automatically sets @owner to THIS_MODULE. | |
503 | * | |
d9a9cdfb | 504 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 505 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
506 | * |
507 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
508 | * underlying sysfs routine (since it is intended for use by attribute | |
509 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
510 | */ | |
523ded71 AS |
511 | int device_schedule_callback_owner(struct device *dev, |
512 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
513 | { |
514 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 515 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 516 | } |
523ded71 | 517 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 518 | |
34bb61f9 JB |
519 | static void klist_children_get(struct klist_node *n) |
520 | { | |
f791b8c8 GKH |
521 | struct device_private *p = to_device_private_parent(n); |
522 | struct device *dev = p->device; | |
34bb61f9 JB |
523 | |
524 | get_device(dev); | |
525 | } | |
526 | ||
527 | static void klist_children_put(struct klist_node *n) | |
528 | { | |
f791b8c8 GKH |
529 | struct device_private *p = to_device_private_parent(n); |
530 | struct device *dev = p->device; | |
34bb61f9 JB |
531 | |
532 | put_device(dev); | |
533 | } | |
534 | ||
1da177e4 | 535 | /** |
4a3ad20c GKH |
536 | * device_initialize - init device structure. |
537 | * @dev: device. | |
1da177e4 | 538 | * |
5739411a CH |
539 | * This prepares the device for use by other layers by initializing |
540 | * its fields. | |
4a3ad20c | 541 | * It is the first half of device_register(), if called by |
5739411a CH |
542 | * that function, though it can also be called separately, so one |
543 | * may use @dev's fields. In particular, get_device()/put_device() | |
544 | * may be used for reference counting of @dev after calling this | |
545 | * function. | |
546 | * | |
547 | * NOTE: Use put_device() to give up your reference instead of freeing | |
548 | * @dev directly once you have called this function. | |
1da177e4 | 549 | */ |
1da177e4 LT |
550 | void device_initialize(struct device *dev) |
551 | { | |
881c6cfd | 552 | dev->kobj.kset = devices_kset; |
f9cb074b | 553 | kobject_init(&dev->kobj, &device_ktype); |
1da177e4 | 554 | INIT_LIST_HEAD(&dev->dma_pools); |
3142788b | 555 | mutex_init(&dev->mutex); |
1704f47b | 556 | lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e TH |
557 | spin_lock_init(&dev->devres_lock); |
558 | INIT_LIST_HEAD(&dev->devres_head); | |
3b98aeaf | 559 | device_pm_init(dev); |
87348136 | 560 | set_dev_node(dev, -1); |
1da177e4 LT |
561 | } |
562 | ||
86406245 | 563 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 564 | { |
86406245 | 565 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 566 | |
86406245 | 567 | if (!virtual_dir) |
4ff6abff | 568 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 569 | &devices_kset->kobj); |
f0ee61a6 | 570 | |
86406245 | 571 | return virtual_dir; |
f0ee61a6 GKH |
572 | } |
573 | ||
bc451f20 EB |
574 | struct class_dir { |
575 | struct kobject kobj; | |
576 | struct class *class; | |
577 | }; | |
578 | ||
579 | #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) | |
580 | ||
581 | static void class_dir_release(struct kobject *kobj) | |
582 | { | |
583 | struct class_dir *dir = to_class_dir(kobj); | |
584 | kfree(dir); | |
585 | } | |
586 | ||
587 | static const | |
588 | struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) | |
40fa5422 | 589 | { |
bc451f20 EB |
590 | struct class_dir *dir = to_class_dir(kobj); |
591 | return dir->class->ns_type; | |
592 | } | |
593 | ||
594 | static struct kobj_type class_dir_ktype = { | |
595 | .release = class_dir_release, | |
596 | .sysfs_ops = &kobj_sysfs_ops, | |
597 | .child_ns_type = class_dir_child_ns_type | |
598 | }; | |
599 | ||
600 | static struct kobject * | |
601 | class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) | |
602 | { | |
603 | struct class_dir *dir; | |
43968d2f GKH |
604 | int retval; |
605 | ||
bc451f20 EB |
606 | dir = kzalloc(sizeof(*dir), GFP_KERNEL); |
607 | if (!dir) | |
608 | return NULL; | |
609 | ||
610 | dir->class = class; | |
611 | kobject_init(&dir->kobj, &class_dir_ktype); | |
612 | ||
613 | dir->kobj.kset = &class->p->class_dirs; | |
614 | ||
615 | retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); | |
616 | if (retval < 0) { | |
617 | kobject_put(&dir->kobj); | |
618 | return NULL; | |
619 | } | |
620 | return &dir->kobj; | |
621 | } | |
622 | ||
623 | ||
624 | static struct kobject *get_device_parent(struct device *dev, | |
625 | struct device *parent) | |
626 | { | |
86406245 | 627 | if (dev->class) { |
77d3d7c1 | 628 | static DEFINE_MUTEX(gdp_mutex); |
86406245 KS |
629 | struct kobject *kobj = NULL; |
630 | struct kobject *parent_kobj; | |
631 | struct kobject *k; | |
632 | ||
ead454fe | 633 | #ifdef CONFIG_BLOCK |
39aba963 | 634 | /* block disks show up in /sys/block */ |
e52eec13 | 635 | if (sysfs_deprecated && dev->class == &block_class) { |
39aba963 KS |
636 | if (parent && parent->class == &block_class) |
637 | return &parent->kobj; | |
638 | return &block_class.p->class_subsys.kobj; | |
639 | } | |
ead454fe | 640 | #endif |
e52eec13 | 641 | |
86406245 KS |
642 | /* |
643 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
644 | * Class-devices with a non class-device as parent, live |
645 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
646 | */ |
647 | if (parent == NULL) | |
648 | parent_kobj = virtual_device_parent(dev); | |
24b1442d | 649 | else if (parent->class && !dev->class->ns_type) |
86406245 KS |
650 | return &parent->kobj; |
651 | else | |
652 | parent_kobj = &parent->kobj; | |
653 | ||
77d3d7c1 TH |
654 | mutex_lock(&gdp_mutex); |
655 | ||
86406245 | 656 | /* find our class-directory at the parent and reference it */ |
7c71448b GKH |
657 | spin_lock(&dev->class->p->class_dirs.list_lock); |
658 | list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) | |
86406245 KS |
659 | if (k->parent == parent_kobj) { |
660 | kobj = kobject_get(k); | |
661 | break; | |
662 | } | |
7c71448b | 663 | spin_unlock(&dev->class->p->class_dirs.list_lock); |
77d3d7c1 TH |
664 | if (kobj) { |
665 | mutex_unlock(&gdp_mutex); | |
86406245 | 666 | return kobj; |
77d3d7c1 | 667 | } |
86406245 KS |
668 | |
669 | /* or create a new class-directory at the parent device */ | |
bc451f20 | 670 | k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc0 | 671 | /* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1 | 672 | mutex_unlock(&gdp_mutex); |
43968d2f | 673 | return k; |
86406245 KS |
674 | } |
675 | ||
676 | if (parent) | |
c744aeae CH |
677 | return &parent->kobj; |
678 | return NULL; | |
679 | } | |
da231fd5 | 680 | |
63b6971a | 681 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 682 | { |
0f4dafc0 | 683 | /* see if we live in a "glue" directory */ |
c1fe539a | 684 | if (!glue_dir || !dev->class || |
7c71448b | 685 | glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5 KS |
686 | return; |
687 | ||
0f4dafc0 | 688 | kobject_put(glue_dir); |
da231fd5 | 689 | } |
63b6971a CH |
690 | |
691 | static void cleanup_device_parent(struct device *dev) | |
692 | { | |
693 | cleanup_glue_dir(dev, dev->kobj.parent); | |
694 | } | |
86406245 | 695 | |
63b6971a | 696 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
697 | { |
698 | struct kobject *kobj; | |
699 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
700 | if (kobj) |
701 | dev->kobj.parent = kobj; | |
40fa5422 | 702 | } |
40fa5422 | 703 | |
2ee97caf CH |
704 | static int device_add_class_symlinks(struct device *dev) |
705 | { | |
706 | int error; | |
707 | ||
708 | if (!dev->class) | |
709 | return 0; | |
da231fd5 | 710 | |
1fbfee6c GKH |
711 | error = sysfs_create_link(&dev->kobj, |
712 | &dev->class->p->class_subsys.kobj, | |
2ee97caf CH |
713 | "subsystem"); |
714 | if (error) | |
715 | goto out; | |
da231fd5 | 716 | |
4e886c29 | 717 | if (dev->parent && device_is_not_partition(dev)) { |
39aba963 | 718 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
4f01a757 DT |
719 | "device"); |
720 | if (error) | |
39aba963 | 721 | goto out_subsys; |
2ee97caf | 722 | } |
2ee97caf | 723 | |
ead454fe | 724 | #ifdef CONFIG_BLOCK |
39aba963 | 725 | /* /sys/block has directories and does not need symlinks */ |
e52eec13 | 726 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 727 | return 0; |
ead454fe | 728 | #endif |
39aba963 | 729 | |
da231fd5 | 730 | /* link in the class directory pointing to the device */ |
1fbfee6c | 731 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf9 | 732 | &dev->kobj, dev_name(dev)); |
da231fd5 | 733 | if (error) |
39aba963 | 734 | goto out_device; |
da231fd5 | 735 | |
da231fd5 KS |
736 | return 0; |
737 | ||
39aba963 KS |
738 | out_device: |
739 | sysfs_remove_link(&dev->kobj, "device"); | |
da231fd5 | 740 | |
2ee97caf CH |
741 | out_subsys: |
742 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
743 | out: | |
744 | return error; | |
745 | } | |
746 | ||
747 | static void device_remove_class_symlinks(struct device *dev) | |
748 | { | |
749 | if (!dev->class) | |
750 | return; | |
da231fd5 | 751 | |
4e886c29 | 752 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 | 753 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 754 | sysfs_remove_link(&dev->kobj, "subsystem"); |
ead454fe | 755 | #ifdef CONFIG_BLOCK |
e52eec13 | 756 | if (sysfs_deprecated && dev->class == &block_class) |
39aba963 | 757 | return; |
ead454fe | 758 | #endif |
39aba963 | 759 | sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev)); |
2ee97caf CH |
760 | } |
761 | ||
413c239f SR |
762 | /** |
763 | * dev_set_name - set a device name | |
764 | * @dev: device | |
46232366 | 765 | * @fmt: format string for the device's name |
413c239f SR |
766 | */ |
767 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
768 | { | |
769 | va_list vargs; | |
1fa5ae85 | 770 | int err; |
413c239f SR |
771 | |
772 | va_start(vargs, fmt); | |
1fa5ae85 | 773 | err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239f | 774 | va_end(vargs); |
1fa5ae85 | 775 | return err; |
413c239f SR |
776 | } |
777 | EXPORT_SYMBOL_GPL(dev_set_name); | |
778 | ||
e105b8bf DW |
779 | /** |
780 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
781 | * @dev: device | |
782 | * | |
783 | * By default we select char/ for new entries. Setting class->dev_obj | |
784 | * to NULL prevents an entry from being created. class->dev_kobj must | |
785 | * be set (or cleared) before any devices are registered to the class | |
786 | * otherwise device_create_sys_dev_entry() and | |
787 | * device_remove_sys_dev_entry() will disagree about the the presence | |
788 | * of the link. | |
789 | */ | |
790 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
791 | { | |
792 | struct kobject *kobj; | |
793 | ||
794 | if (dev->class) | |
795 | kobj = dev->class->dev_kobj; | |
796 | else | |
797 | kobj = sysfs_dev_char_kobj; | |
798 | ||
799 | return kobj; | |
800 | } | |
801 | ||
802 | static int device_create_sys_dev_entry(struct device *dev) | |
803 | { | |
804 | struct kobject *kobj = device_to_dev_kobj(dev); | |
805 | int error = 0; | |
806 | char devt_str[15]; | |
807 | ||
808 | if (kobj) { | |
809 | format_dev_t(devt_str, dev->devt); | |
810 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
811 | } | |
812 | ||
813 | return error; | |
814 | } | |
815 | ||
816 | static void device_remove_sys_dev_entry(struct device *dev) | |
817 | { | |
818 | struct kobject *kobj = device_to_dev_kobj(dev); | |
819 | char devt_str[15]; | |
820 | ||
821 | if (kobj) { | |
822 | format_dev_t(devt_str, dev->devt); | |
823 | sysfs_remove_link(kobj, devt_str); | |
824 | } | |
825 | } | |
826 | ||
b4028437 GKH |
827 | int device_private_init(struct device *dev) |
828 | { | |
829 | dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); | |
830 | if (!dev->p) | |
831 | return -ENOMEM; | |
832 | dev->p->device = dev; | |
833 | klist_init(&dev->p->klist_children, klist_children_get, | |
834 | klist_children_put); | |
835 | return 0; | |
836 | } | |
837 | ||
1da177e4 | 838 | /** |
4a3ad20c GKH |
839 | * device_add - add device to device hierarchy. |
840 | * @dev: device. | |
1da177e4 | 841 | * |
4a3ad20c GKH |
842 | * This is part 2 of device_register(), though may be called |
843 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 844 | * |
5739411a | 845 | * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20c GKH |
846 | * to the global and sibling lists for the device, then |
847 | * adds it to the other relevant subsystems of the driver model. | |
5739411a CH |
848 | * |
849 | * NOTE: _Never_ directly free @dev after calling this function, even | |
850 | * if it returned an error! Always use put_device() to give up your | |
851 | * reference instead. | |
1da177e4 LT |
852 | */ |
853 | int device_add(struct device *dev) | |
854 | { | |
855 | struct device *parent = NULL; | |
c47ed219 | 856 | struct class_interface *class_intf; |
c906a48a | 857 | int error = -EINVAL; |
775b64d2 | 858 | |
1da177e4 | 859 | dev = get_device(dev); |
c906a48a GKH |
860 | if (!dev) |
861 | goto done; | |
862 | ||
fb069a5d | 863 | if (!dev->p) { |
b4028437 GKH |
864 | error = device_private_init(dev); |
865 | if (error) | |
866 | goto done; | |
fb069a5d | 867 | } |
fb069a5d | 868 | |
1fa5ae85 KS |
869 | /* |
870 | * for statically allocated devices, which should all be converted | |
871 | * some day, we need to initialize the name. We prevent reading back | |
872 | * the name, and force the use of dev_name() | |
873 | */ | |
874 | if (dev->init_name) { | |
acc0e90f | 875 | dev_set_name(dev, "%s", dev->init_name); |
1fa5ae85 KS |
876 | dev->init_name = NULL; |
877 | } | |
c906a48a | 878 | |
e6309e75 TG |
879 | if (!dev_name(dev)) { |
880 | error = -EINVAL; | |
5c8563d7 | 881 | goto name_error; |
e6309e75 | 882 | } |
1da177e4 | 883 | |
1e0b2cf9 | 884 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
c205ef48 | 885 | |
1da177e4 | 886 | parent = get_device(dev->parent); |
63b6971a | 887 | setup_parent(dev, parent); |
1da177e4 | 888 | |
0d358f22 YL |
889 | /* use parent numa_node */ |
890 | if (parent) | |
891 | set_dev_node(dev, dev_to_node(parent)); | |
892 | ||
1da177e4 | 893 | /* first, register with generic layer. */ |
8a577ffc KS |
894 | /* we require the name to be set before, and pass NULL */ |
895 | error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); | |
40fa5422 | 896 | if (error) |
1da177e4 | 897 | goto Error; |
a7fd6706 | 898 | |
37022644 BW |
899 | /* notify platform of device entry */ |
900 | if (platform_notify) | |
901 | platform_notify(dev); | |
902 | ||
ad6a1e1c | 903 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
904 | if (error) |
905 | goto attrError; | |
a7fd6706 | 906 | |
23681e47 | 907 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
908 | error = device_create_file(dev, &devt_attr); |
909 | if (error) | |
a306eea4 | 910 | goto ueventattrError; |
e105b8bf DW |
911 | |
912 | error = device_create_sys_dev_entry(dev); | |
913 | if (error) | |
914 | goto devtattrError; | |
2b2af54a KS |
915 | |
916 | devtmpfs_create_node(dev); | |
23681e47 GKH |
917 | } |
918 | ||
2ee97caf CH |
919 | error = device_add_class_symlinks(dev); |
920 | if (error) | |
921 | goto SymlinkError; | |
dc0afa83 CH |
922 | error = device_add_attrs(dev); |
923 | if (error) | |
2620efef | 924 | goto AttrsError; |
dc0afa83 CH |
925 | error = bus_add_device(dev); |
926 | if (error) | |
1da177e4 | 927 | goto BusError; |
3b98aeaf | 928 | error = dpm_sysfs_add(dev); |
57eee3d2 | 929 | if (error) |
3b98aeaf AS |
930 | goto DPMError; |
931 | device_pm_add(dev); | |
ec0676ee AS |
932 | |
933 | /* Notify clients of device addition. This call must come | |
934 | * after dpm_sysf_add() and before kobject_uevent(). | |
935 | */ | |
936 | if (dev->bus) | |
937 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
938 | BUS_NOTIFY_ADD_DEVICE, dev); | |
939 | ||
83b5fb4c | 940 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610 | 941 | bus_probe_device(dev); |
1da177e4 | 942 | if (parent) |
f791b8c8 GKH |
943 | klist_add_tail(&dev->p->knode_parent, |
944 | &parent->p->klist_children); | |
1da177e4 | 945 | |
5d9fd169 | 946 | if (dev->class) { |
f75b1c60 | 947 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 948 | /* tie the class to the device */ |
5a3ceb86 TH |
949 | klist_add_tail(&dev->knode_class, |
950 | &dev->class->p->class_devices); | |
c47ed219 GKH |
951 | |
952 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
953 | list_for_each_entry(class_intf, |
954 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
955 | if (class_intf->add_dev) |
956 | class_intf->add_dev(dev, class_intf); | |
f75b1c60 | 957 | mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169 | 958 | } |
c906a48a | 959 | done: |
1da177e4 LT |
960 | put_device(dev); |
961 | return error; | |
3b98aeaf | 962 | DPMError: |
57eee3d2 RW |
963 | bus_remove_device(dev); |
964 | BusError: | |
82f0cf9b | 965 | device_remove_attrs(dev); |
2620efef | 966 | AttrsError: |
2ee97caf CH |
967 | device_remove_class_symlinks(dev); |
968 | SymlinkError: | |
ad72956d KS |
969 | if (MAJOR(dev->devt)) |
970 | devtmpfs_delete_node(dev); | |
e105b8bf DW |
971 | if (MAJOR(dev->devt)) |
972 | device_remove_sys_dev_entry(dev); | |
973 | devtattrError: | |
ad6a1e1c TH |
974 | if (MAJOR(dev->devt)) |
975 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 976 | ueventattrError: |
ad6a1e1c | 977 | device_remove_file(dev, &uevent_attr); |
23681e47 | 978 | attrError: |
312c004d | 979 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
980 | kobject_del(&dev->kobj); |
981 | Error: | |
63b6971a | 982 | cleanup_device_parent(dev); |
1da177e4 LT |
983 | if (parent) |
984 | put_device(parent); | |
5c8563d7 KS |
985 | name_error: |
986 | kfree(dev->p); | |
987 | dev->p = NULL; | |
c906a48a | 988 | goto done; |
1da177e4 LT |
989 | } |
990 | ||
1da177e4 | 991 | /** |
4a3ad20c GKH |
992 | * device_register - register a device with the system. |
993 | * @dev: pointer to the device structure | |
1da177e4 | 994 | * |
4a3ad20c GKH |
995 | * This happens in two clean steps - initialize the device |
996 | * and add it to the system. The two steps can be called | |
997 | * separately, but this is the easiest and most common. | |
998 | * I.e. you should only call the two helpers separately if | |
999 | * have a clearly defined need to use and refcount the device | |
1000 | * before it is added to the hierarchy. | |
5739411a CH |
1001 | * |
1002 | * NOTE: _Never_ directly free @dev after calling this function, even | |
1003 | * if it returned an error! Always use put_device() to give up the | |
1004 | * reference initialized in this function instead. | |
1da177e4 | 1005 | */ |
1da177e4 LT |
1006 | int device_register(struct device *dev) |
1007 | { | |
1008 | device_initialize(dev); | |
1009 | return device_add(dev); | |
1010 | } | |
1011 | ||
1da177e4 | 1012 | /** |
4a3ad20c GKH |
1013 | * get_device - increment reference count for device. |
1014 | * @dev: device. | |
1da177e4 | 1015 | * |
4a3ad20c GKH |
1016 | * This simply forwards the call to kobject_get(), though |
1017 | * we do take care to provide for the case that we get a NULL | |
1018 | * pointer passed in. | |
1da177e4 | 1019 | */ |
4a3ad20c | 1020 | struct device *get_device(struct device *dev) |
1da177e4 LT |
1021 | { |
1022 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
1023 | } | |
1024 | ||
1da177e4 | 1025 | /** |
4a3ad20c GKH |
1026 | * put_device - decrement reference count. |
1027 | * @dev: device in question. | |
1da177e4 | 1028 | */ |
4a3ad20c | 1029 | void put_device(struct device *dev) |
1da177e4 | 1030 | { |
edfaa7c3 | 1031 | /* might_sleep(); */ |
1da177e4 LT |
1032 | if (dev) |
1033 | kobject_put(&dev->kobj); | |
1034 | } | |
1035 | ||
1da177e4 | 1036 | /** |
4a3ad20c GKH |
1037 | * device_del - delete device from system. |
1038 | * @dev: device. | |
1da177e4 | 1039 | * |
4a3ad20c GKH |
1040 | * This is the first part of the device unregistration |
1041 | * sequence. This removes the device from the lists we control | |
1042 | * from here, has it removed from the other driver model | |
1043 | * subsystems it was added to in device_add(), and removes it | |
1044 | * from the kobject hierarchy. | |
1da177e4 | 1045 | * |
4a3ad20c GKH |
1046 | * NOTE: this should be called manually _iff_ device_add() was |
1047 | * also called manually. | |
1da177e4 | 1048 | */ |
4a3ad20c | 1049 | void device_del(struct device *dev) |
1da177e4 | 1050 | { |
4a3ad20c | 1051 | struct device *parent = dev->parent; |
c47ed219 | 1052 | struct class_interface *class_intf; |
1da177e4 | 1053 | |
ec0676ee AS |
1054 | /* Notify clients of device removal. This call must come |
1055 | * before dpm_sysfs_remove(). | |
1056 | */ | |
1057 | if (dev->bus) | |
1058 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, | |
1059 | BUS_NOTIFY_DEL_DEVICE, dev); | |
775b64d2 | 1060 | device_pm_remove(dev); |
3b98aeaf | 1061 | dpm_sysfs_remove(dev); |
1da177e4 | 1062 | if (parent) |
f791b8c8 | 1063 | klist_del(&dev->p->knode_parent); |
e105b8bf | 1064 | if (MAJOR(dev->devt)) { |
2b2af54a | 1065 | devtmpfs_delete_node(dev); |
e105b8bf | 1066 | device_remove_sys_dev_entry(dev); |
ad6a1e1c | 1067 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1068 | } |
b9d9c82b | 1069 | if (dev->class) { |
da231fd5 | 1070 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1071 | |
f75b1c60 | 1072 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 1073 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1074 | list_for_each_entry(class_intf, |
1075 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1076 | if (class_intf->remove_dev) |
1077 | class_intf->remove_dev(dev, class_intf); | |
1078 | /* remove the device from the class list */ | |
5a3ceb86 | 1079 | klist_del(&dev->knode_class); |
f75b1c60 | 1080 | mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b | 1081 | } |
ad6a1e1c | 1082 | device_remove_file(dev, &uevent_attr); |
2620efef | 1083 | device_remove_attrs(dev); |
28953533 | 1084 | bus_remove_device(dev); |
1da177e4 | 1085 | |
2f8d16a9 TH |
1086 | /* |
1087 | * Some platform devices are driven without driver attached | |
1088 | * and managed resources may have been acquired. Make sure | |
1089 | * all resources are released. | |
1090 | */ | |
1091 | devres_release_all(dev); | |
1092 | ||
1da177e4 LT |
1093 | /* Notify the platform of the removal, in case they |
1094 | * need to do anything... | |
1095 | */ | |
1096 | if (platform_notify_remove) | |
1097 | platform_notify_remove(dev); | |
312c004d | 1098 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1099 | cleanup_device_parent(dev); |
1da177e4 | 1100 | kobject_del(&dev->kobj); |
da231fd5 | 1101 | put_device(parent); |
1da177e4 LT |
1102 | } |
1103 | ||
1104 | /** | |
4a3ad20c GKH |
1105 | * device_unregister - unregister device from system. |
1106 | * @dev: device going away. | |
1da177e4 | 1107 | * |
4a3ad20c GKH |
1108 | * We do this in two parts, like we do device_register(). First, |
1109 | * we remove it from all the subsystems with device_del(), then | |
1110 | * we decrement the reference count via put_device(). If that | |
1111 | * is the final reference count, the device will be cleaned up | |
1112 | * via device_release() above. Otherwise, the structure will | |
1113 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1114 | */ |
4a3ad20c | 1115 | void device_unregister(struct device *dev) |
1da177e4 | 1116 | { |
1e0b2cf9 | 1117 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
1da177e4 LT |
1118 | device_del(dev); |
1119 | put_device(dev); | |
1120 | } | |
1121 | ||
4a3ad20c | 1122 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1123 | { |
4a3ad20c | 1124 | struct klist_node *n = klist_next(i); |
f791b8c8 GKH |
1125 | struct device *dev = NULL; |
1126 | struct device_private *p; | |
1127 | ||
1128 | if (n) { | |
1129 | p = to_device_private_parent(n); | |
1130 | dev = p->device; | |
1131 | } | |
1132 | return dev; | |
36239577 | 1133 | } |
1134 | ||
6fcf53ac | 1135 | /** |
e454cea2 | 1136 | * device_get_devnode - path of device node file |
6fcf53ac | 1137 | * @dev: device |
e454cea2 | 1138 | * @mode: returned file access mode |
6fcf53ac KS |
1139 | * @tmp: possibly allocated string |
1140 | * | |
1141 | * Return the relative path of a possible device node. | |
1142 | * Non-default names may need to allocate a memory to compose | |
1143 | * a name. This memory is returned in tmp and needs to be | |
1144 | * freed by the caller. | |
1145 | */ | |
e454cea2 KS |
1146 | const char *device_get_devnode(struct device *dev, |
1147 | mode_t *mode, const char **tmp) | |
6fcf53ac KS |
1148 | { |
1149 | char *s; | |
1150 | ||
1151 | *tmp = NULL; | |
1152 | ||
1153 | /* the device type may provide a specific name */ | |
e454cea2 KS |
1154 | if (dev->type && dev->type->devnode) |
1155 | *tmp = dev->type->devnode(dev, mode); | |
6fcf53ac KS |
1156 | if (*tmp) |
1157 | return *tmp; | |
1158 | ||
1159 | /* the class may provide a specific name */ | |
e454cea2 KS |
1160 | if (dev->class && dev->class->devnode) |
1161 | *tmp = dev->class->devnode(dev, mode); | |
6fcf53ac KS |
1162 | if (*tmp) |
1163 | return *tmp; | |
1164 | ||
1165 | /* return name without allocation, tmp == NULL */ | |
1166 | if (strchr(dev_name(dev), '!') == NULL) | |
1167 | return dev_name(dev); | |
1168 | ||
1169 | /* replace '!' in the name with '/' */ | |
1170 | *tmp = kstrdup(dev_name(dev), GFP_KERNEL); | |
1171 | if (!*tmp) | |
1172 | return NULL; | |
1173 | while ((s = strchr(*tmp, '!'))) | |
1174 | s[0] = '/'; | |
1175 | return *tmp; | |
1176 | } | |
1177 | ||
1da177e4 | 1178 | /** |
4a3ad20c GKH |
1179 | * device_for_each_child - device child iterator. |
1180 | * @parent: parent struct device. | |
1181 | * @data: data for the callback. | |
1182 | * @fn: function to be called for each device. | |
1da177e4 | 1183 | * |
4a3ad20c GKH |
1184 | * Iterate over @parent's child devices, and call @fn for each, |
1185 | * passing it @data. | |
1da177e4 | 1186 | * |
4a3ad20c GKH |
1187 | * We check the return of @fn each time. If it returns anything |
1188 | * other than 0, we break out and return that value. | |
1da177e4 | 1189 | */ |
4a3ad20c GKH |
1190 | int device_for_each_child(struct device *parent, void *data, |
1191 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1192 | { |
36239577 | 1193 | struct klist_iter i; |
4a3ad20c | 1194 | struct device *child; |
1da177e4 LT |
1195 | int error = 0; |
1196 | ||
014c90db GKH |
1197 | if (!parent->p) |
1198 | return 0; | |
1199 | ||
f791b8c8 | 1200 | klist_iter_init(&parent->p->klist_children, &i); |
36239577 | 1201 | while ((child = next_device(&i)) && !error) |
1202 | error = fn(child, data); | |
1203 | klist_iter_exit(&i); | |
1da177e4 LT |
1204 | return error; |
1205 | } | |
1206 | ||
5ab69981 CH |
1207 | /** |
1208 | * device_find_child - device iterator for locating a particular device. | |
1209 | * @parent: parent struct device | |
1210 | * @data: Data to pass to match function | |
1211 | * @match: Callback function to check device | |
1212 | * | |
1213 | * This is similar to the device_for_each_child() function above, but it | |
1214 | * returns a reference to a device that is 'found' for later use, as | |
1215 | * determined by the @match callback. | |
1216 | * | |
1217 | * The callback should return 0 if the device doesn't match and non-zero | |
1218 | * if it does. If the callback returns non-zero and a reference to the | |
1219 | * current device can be obtained, this function will return to the caller | |
1220 | * and not iterate over any more devices. | |
1221 | */ | |
4a3ad20c GKH |
1222 | struct device *device_find_child(struct device *parent, void *data, |
1223 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1224 | { |
1225 | struct klist_iter i; | |
1226 | struct device *child; | |
1227 | ||
1228 | if (!parent) | |
1229 | return NULL; | |
1230 | ||
f791b8c8 | 1231 | klist_iter_init(&parent->p->klist_children, &i); |
5ab69981 CH |
1232 | while ((child = next_device(&i))) |
1233 | if (match(child, data) && get_device(child)) | |
1234 | break; | |
1235 | klist_iter_exit(&i); | |
1236 | return child; | |
1237 | } | |
1238 | ||
1da177e4 LT |
1239 | int __init devices_init(void) |
1240 | { | |
881c6cfd GKH |
1241 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1242 | if (!devices_kset) | |
1243 | return -ENOMEM; | |
e105b8bf DW |
1244 | dev_kobj = kobject_create_and_add("dev", NULL); |
1245 | if (!dev_kobj) | |
1246 | goto dev_kobj_err; | |
1247 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1248 | if (!sysfs_dev_block_kobj) | |
1249 | goto block_kobj_err; | |
1250 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1251 | if (!sysfs_dev_char_kobj) | |
1252 | goto char_kobj_err; | |
1253 | ||
881c6cfd | 1254 | return 0; |
e105b8bf DW |
1255 | |
1256 | char_kobj_err: | |
1257 | kobject_put(sysfs_dev_block_kobj); | |
1258 | block_kobj_err: | |
1259 | kobject_put(dev_kobj); | |
1260 | dev_kobj_err: | |
1261 | kset_unregister(devices_kset); | |
1262 | return -ENOMEM; | |
1da177e4 LT |
1263 | } |
1264 | ||
1265 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1266 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1267 | |
1268 | EXPORT_SYMBOL_GPL(device_initialize); | |
1269 | EXPORT_SYMBOL_GPL(device_add); | |
1270 | EXPORT_SYMBOL_GPL(device_register); | |
1271 | ||
1272 | EXPORT_SYMBOL_GPL(device_del); | |
1273 | EXPORT_SYMBOL_GPL(device_unregister); | |
1274 | EXPORT_SYMBOL_GPL(get_device); | |
1275 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1276 | |
1277 | EXPORT_SYMBOL_GPL(device_create_file); | |
1278 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 | 1279 | |
0aa0dc41 MM |
1280 | struct root_device |
1281 | { | |
1282 | struct device dev; | |
1283 | struct module *owner; | |
1284 | }; | |
1285 | ||
1286 | #define to_root_device(dev) container_of(dev, struct root_device, dev) | |
1287 | ||
1288 | static void root_device_release(struct device *dev) | |
1289 | { | |
1290 | kfree(to_root_device(dev)); | |
1291 | } | |
1292 | ||
1293 | /** | |
1294 | * __root_device_register - allocate and register a root device | |
1295 | * @name: root device name | |
1296 | * @owner: owner module of the root device, usually THIS_MODULE | |
1297 | * | |
1298 | * This function allocates a root device and registers it | |
1299 | * using device_register(). In order to free the returned | |
1300 | * device, use root_device_unregister(). | |
1301 | * | |
1302 | * Root devices are dummy devices which allow other devices | |
1303 | * to be grouped under /sys/devices. Use this function to | |
1304 | * allocate a root device and then use it as the parent of | |
1305 | * any device which should appear under /sys/devices/{name} | |
1306 | * | |
1307 | * The /sys/devices/{name} directory will also contain a | |
1308 | * 'module' symlink which points to the @owner directory | |
1309 | * in sysfs. | |
1310 | * | |
f0eae0ed JN |
1311 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1312 | * | |
0aa0dc41 MM |
1313 | * Note: You probably want to use root_device_register(). |
1314 | */ | |
1315 | struct device *__root_device_register(const char *name, struct module *owner) | |
1316 | { | |
1317 | struct root_device *root; | |
1318 | int err = -ENOMEM; | |
1319 | ||
1320 | root = kzalloc(sizeof(struct root_device), GFP_KERNEL); | |
1321 | if (!root) | |
1322 | return ERR_PTR(err); | |
1323 | ||
acc0e90f | 1324 | err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41 MM |
1325 | if (err) { |
1326 | kfree(root); | |
1327 | return ERR_PTR(err); | |
1328 | } | |
1329 | ||
1330 | root->dev.release = root_device_release; | |
1331 | ||
1332 | err = device_register(&root->dev); | |
1333 | if (err) { | |
1334 | put_device(&root->dev); | |
1335 | return ERR_PTR(err); | |
1336 | } | |
1337 | ||
1d9e882b | 1338 | #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41 MM |
1339 | if (owner) { |
1340 | struct module_kobject *mk = &owner->mkobj; | |
1341 | ||
1342 | err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); | |
1343 | if (err) { | |
1344 | device_unregister(&root->dev); | |
1345 | return ERR_PTR(err); | |
1346 | } | |
1347 | root->owner = owner; | |
1348 | } | |
1349 | #endif | |
1350 | ||
1351 | return &root->dev; | |
1352 | } | |
1353 | EXPORT_SYMBOL_GPL(__root_device_register); | |
1354 | ||
1355 | /** | |
1356 | * root_device_unregister - unregister and free a root device | |
7cbcf225 | 1357 | * @dev: device going away |
0aa0dc41 MM |
1358 | * |
1359 | * This function unregisters and cleans up a device that was created by | |
1360 | * root_device_register(). | |
1361 | */ | |
1362 | void root_device_unregister(struct device *dev) | |
1363 | { | |
1364 | struct root_device *root = to_root_device(dev); | |
1365 | ||
1366 | if (root->owner) | |
1367 | sysfs_remove_link(&root->dev.kobj, "module"); | |
1368 | ||
1369 | device_unregister(dev); | |
1370 | } | |
1371 | EXPORT_SYMBOL_GPL(root_device_unregister); | |
1372 | ||
23681e47 GKH |
1373 | |
1374 | static void device_create_release(struct device *dev) | |
1375 | { | |
1e0b2cf9 | 1376 | pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
23681e47 GKH |
1377 | kfree(dev); |
1378 | } | |
1379 | ||
1380 | /** | |
8882b394 | 1381 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1382 | * @class: pointer to the struct class that this device should be registered to |
1383 | * @parent: pointer to the parent struct device of this new device, if any | |
1384 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1385 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1386 | * @fmt: string for the device's name |
8882b394 | 1387 | * @args: va_list for the device's name |
42734daf HK |
1388 | * |
1389 | * This function can be used by char device classes. A struct device | |
1390 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1391 | * |
23681e47 GKH |
1392 | * A "dev" file will be created, showing the dev_t for the device, if |
1393 | * the dev_t is not 0,0. | |
42734daf HK |
1394 | * If a pointer to a parent struct device is passed in, the newly created |
1395 | * struct device will be a child of that device in sysfs. | |
1396 | * The pointer to the struct device will be returned from the call. | |
1397 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1398 | * pointer. |
1399 | * | |
f0eae0ed JN |
1400 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1401 | * | |
23681e47 GKH |
1402 | * Note: the struct class passed to this function must have previously |
1403 | * been created with a call to class_create(). | |
1404 | */ | |
8882b394 GKH |
1405 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1406 | dev_t devt, void *drvdata, const char *fmt, | |
1407 | va_list args) | |
23681e47 | 1408 | { |
23681e47 GKH |
1409 | struct device *dev = NULL; |
1410 | int retval = -ENODEV; | |
1411 | ||
1412 | if (class == NULL || IS_ERR(class)) | |
1413 | goto error; | |
23681e47 GKH |
1414 | |
1415 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1416 | if (!dev) { | |
1417 | retval = -ENOMEM; | |
1418 | goto error; | |
1419 | } | |
1420 | ||
1421 | dev->devt = devt; | |
1422 | dev->class = class; | |
1423 | dev->parent = parent; | |
1424 | dev->release = device_create_release; | |
8882b394 | 1425 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1426 | |
1fa5ae85 KS |
1427 | retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
1428 | if (retval) | |
1429 | goto error; | |
1430 | ||
23681e47 GKH |
1431 | retval = device_register(dev); |
1432 | if (retval) | |
1433 | goto error; | |
1434 | ||
23681e47 GKH |
1435 | return dev; |
1436 | ||
1437 | error: | |
286661b3 | 1438 | put_device(dev); |
23681e47 GKH |
1439 | return ERR_PTR(retval); |
1440 | } | |
8882b394 GKH |
1441 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1442 | ||
1443 | /** | |
4e106739 | 1444 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1445 | * @class: pointer to the struct class that this device should be registered to |
1446 | * @parent: pointer to the parent struct device of this new device, if any | |
1447 | * @devt: the dev_t for the char device to be added | |
1448 | * @drvdata: the data to be added to the device for callbacks | |
1449 | * @fmt: string for the device's name | |
1450 | * | |
1451 | * This function can be used by char device classes. A struct device | |
1452 | * will be created in sysfs, registered to the specified class. | |
1453 | * | |
1454 | * A "dev" file will be created, showing the dev_t for the device, if | |
1455 | * the dev_t is not 0,0. | |
1456 | * If a pointer to a parent struct device is passed in, the newly created | |
1457 | * struct device will be a child of that device in sysfs. | |
1458 | * The pointer to the struct device will be returned from the call. | |
1459 | * Any further sysfs files that might be required can be created using this | |
1460 | * pointer. | |
1461 | * | |
f0eae0ed JN |
1462 | * Returns &struct device pointer on success, or ERR_PTR() on error. |
1463 | * | |
8882b394 GKH |
1464 | * Note: the struct class passed to this function must have previously |
1465 | * been created with a call to class_create(). | |
1466 | */ | |
4e106739 GKH |
1467 | struct device *device_create(struct class *class, struct device *parent, |
1468 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1469 | { |
1470 | va_list vargs; | |
1471 | struct device *dev; | |
1472 | ||
1473 | va_start(vargs, fmt); | |
1474 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1475 | va_end(vargs); | |
1476 | return dev; | |
1477 | } | |
4e106739 | 1478 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1479 | |
cd35449b | 1480 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1481 | { |
cd35449b | 1482 | dev_t *devt = data; |
23681e47 | 1483 | |
cd35449b | 1484 | return dev->devt == *devt; |
775b64d2 RW |
1485 | } |
1486 | ||
1487 | /** | |
1488 | * device_destroy - removes a device that was created with device_create() | |
1489 | * @class: pointer to the struct class that this device was registered with | |
1490 | * @devt: the dev_t of the device that was previously registered | |
1491 | * | |
1492 | * This call unregisters and cleans up a device that was created with a | |
1493 | * call to device_create(). | |
1494 | */ | |
1495 | void device_destroy(struct class *class, dev_t devt) | |
1496 | { | |
1497 | struct device *dev; | |
23681e47 | 1498 | |
695794ae | 1499 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1500 | if (dev) { |
1501 | put_device(dev); | |
23681e47 | 1502 | device_unregister(dev); |
cd35449b | 1503 | } |
23681e47 GKH |
1504 | } |
1505 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1506 | |
1507 | /** | |
1508 | * device_rename - renames a device | |
1509 | * @dev: the pointer to the struct device to be renamed | |
1510 | * @new_name: the new name of the device | |
030c1d2b EB |
1511 | * |
1512 | * It is the responsibility of the caller to provide mutual | |
1513 | * exclusion between two different calls of device_rename | |
1514 | * on the same device to ensure that new_name is valid and | |
1515 | * won't conflict with other devices. | |
a2de48ca | 1516 | */ |
6937e8f8 | 1517 | int device_rename(struct device *dev, const char *new_name) |
a2de48ca GKH |
1518 | { |
1519 | char *old_class_name = NULL; | |
1520 | char *new_class_name = NULL; | |
2ee97caf | 1521 | char *old_device_name = NULL; |
a2de48ca GKH |
1522 | int error; |
1523 | ||
1524 | dev = get_device(dev); | |
1525 | if (!dev) | |
1526 | return -EINVAL; | |
1527 | ||
1e0b2cf9 | 1528 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), |
2b3a302a | 1529 | __func__, new_name); |
a2de48ca | 1530 | |
1fa5ae85 | 1531 | old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf CH |
1532 | if (!old_device_name) { |
1533 | error = -ENOMEM; | |
1534 | goto out; | |
a2de48ca | 1535 | } |
a2de48ca | 1536 | |
f349cf34 EB |
1537 | if (dev->class) { |
1538 | error = sysfs_rename_link(&dev->class->p->class_subsys.kobj, | |
1539 | &dev->kobj, old_device_name, new_name); | |
1540 | if (error) | |
1541 | goto out; | |
1542 | } | |
39aba963 | 1543 | |
a2de48ca | 1544 | error = kobject_rename(&dev->kobj, new_name); |
1fa5ae85 | 1545 | if (error) |
2ee97caf | 1546 | goto out; |
a2de48ca | 1547 | |
2ee97caf | 1548 | out: |
a2de48ca GKH |
1549 | put_device(dev); |
1550 | ||
a2de48ca | 1551 | kfree(new_class_name); |
952ab431 | 1552 | kfree(old_class_name); |
2ee97caf | 1553 | kfree(old_device_name); |
a2de48ca GKH |
1554 | |
1555 | return error; | |
1556 | } | |
a2807dbc | 1557 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1558 | |
1559 | static int device_move_class_links(struct device *dev, | |
1560 | struct device *old_parent, | |
1561 | struct device *new_parent) | |
1562 | { | |
f7f3461d | 1563 | int error = 0; |
8a82472f | 1564 | |
f7f3461d GKH |
1565 | if (old_parent) |
1566 | sysfs_remove_link(&dev->kobj, "device"); | |
1567 | if (new_parent) | |
1568 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1569 | "device"); | |
1570 | return error; | |
8a82472f CH |
1571 | } |
1572 | ||
1573 | /** | |
1574 | * device_move - moves a device to a new parent | |
1575 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1576 | * @new_parent: the new parent of the device (can by NULL) |
ffa6a705 | 1577 | * @dpm_order: how to reorder the dpm_list |
8a82472f | 1578 | */ |
ffa6a705 CH |
1579 | int device_move(struct device *dev, struct device *new_parent, |
1580 | enum dpm_order dpm_order) | |
8a82472f CH |
1581 | { |
1582 | int error; | |
1583 | struct device *old_parent; | |
c744aeae | 1584 | struct kobject *new_parent_kobj; |
8a82472f CH |
1585 | |
1586 | dev = get_device(dev); | |
1587 | if (!dev) | |
1588 | return -EINVAL; | |
1589 | ||
ffa6a705 | 1590 | device_pm_lock(); |
8a82472f | 1591 | new_parent = get_device(new_parent); |
4a3ad20c | 1592 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1593 | |
1e0b2cf9 KS |
1594 | pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
1595 | __func__, new_parent ? dev_name(new_parent) : "<NULL>"); | |
c744aeae | 1596 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1597 | if (error) { |
63b6971a | 1598 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1599 | put_device(new_parent); |
1600 | goto out; | |
1601 | } | |
1602 | old_parent = dev->parent; | |
1603 | dev->parent = new_parent; | |
1604 | if (old_parent) | |
f791b8c8 | 1605 | klist_remove(&dev->p->knode_parent); |
0d358f22 | 1606 | if (new_parent) { |
f791b8c8 GKH |
1607 | klist_add_tail(&dev->p->knode_parent, |
1608 | &new_parent->p->klist_children); | |
0d358f22 YL |
1609 | set_dev_node(dev, dev_to_node(new_parent)); |
1610 | } | |
1611 | ||
8a82472f CH |
1612 | if (!dev->class) |
1613 | goto out_put; | |
1614 | error = device_move_class_links(dev, old_parent, new_parent); | |
1615 | if (error) { | |
1616 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1617 | device_move_class_links(dev, new_parent, old_parent); | |
1618 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae | 1619 | if (new_parent) |
f791b8c8 | 1620 | klist_remove(&dev->p->knode_parent); |
0d358f22 YL |
1621 | dev->parent = old_parent; |
1622 | if (old_parent) { | |
f791b8c8 GKH |
1623 | klist_add_tail(&dev->p->knode_parent, |
1624 | &old_parent->p->klist_children); | |
0d358f22 YL |
1625 | set_dev_node(dev, dev_to_node(old_parent)); |
1626 | } | |
8a82472f | 1627 | } |
63b6971a | 1628 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1629 | put_device(new_parent); |
1630 | goto out; | |
1631 | } | |
ffa6a705 CH |
1632 | switch (dpm_order) { |
1633 | case DPM_ORDER_NONE: | |
1634 | break; | |
1635 | case DPM_ORDER_DEV_AFTER_PARENT: | |
1636 | device_pm_move_after(dev, new_parent); | |
1637 | break; | |
1638 | case DPM_ORDER_PARENT_BEFORE_DEV: | |
1639 | device_pm_move_before(new_parent, dev); | |
1640 | break; | |
1641 | case DPM_ORDER_DEV_LAST: | |
1642 | device_pm_move_last(dev); | |
1643 | break; | |
1644 | } | |
8a82472f CH |
1645 | out_put: |
1646 | put_device(old_parent); | |
1647 | out: | |
ffa6a705 | 1648 | device_pm_unlock(); |
8a82472f CH |
1649 | put_device(dev); |
1650 | return error; | |
1651 | } | |
8a82472f | 1652 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1653 | |
1654 | /** | |
1655 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1656 | */ | |
1657 | void device_shutdown(void) | |
1658 | { | |
6245838f HD |
1659 | struct device *dev; |
1660 | ||
1661 | spin_lock(&devices_kset->list_lock); | |
1662 | /* | |
1663 | * Walk the devices list backward, shutting down each in turn. | |
1664 | * Beware that device unplug events may also start pulling | |
1665 | * devices offline, even as the system is shutting down. | |
1666 | */ | |
1667 | while (!list_empty(&devices_kset->list)) { | |
1668 | dev = list_entry(devices_kset->list.prev, struct device, | |
1669 | kobj.entry); | |
1670 | get_device(dev); | |
1671 | /* | |
1672 | * Make sure the device is off the kset list, in the | |
1673 | * event that dev->*->shutdown() doesn't remove it. | |
1674 | */ | |
1675 | list_del_init(&dev->kobj.entry); | |
1676 | spin_unlock(&devices_kset->list_lock); | |
37b0c020 | 1677 | |
37b0c020 GKH |
1678 | if (dev->bus && dev->bus->shutdown) { |
1679 | dev_dbg(dev, "shutdown\n"); | |
1680 | dev->bus->shutdown(dev); | |
1681 | } else if (dev->driver && dev->driver->shutdown) { | |
1682 | dev_dbg(dev, "shutdown\n"); | |
1683 | dev->driver->shutdown(dev); | |
1684 | } | |
6245838f HD |
1685 | put_device(dev); |
1686 | ||
1687 | spin_lock(&devices_kset->list_lock); | |
37b0c020 | 1688 | } |
6245838f | 1689 | spin_unlock(&devices_kset->list_lock); |
401097ea | 1690 | async_synchronize_full(); |
37b0c020 | 1691 | } |
99bcf217 JP |
1692 | |
1693 | /* | |
1694 | * Device logging functions | |
1695 | */ | |
1696 | ||
1697 | #ifdef CONFIG_PRINTK | |
1698 | ||
1699 | static int __dev_printk(const char *level, const struct device *dev, | |
1700 | struct va_format *vaf) | |
1701 | { | |
1702 | if (!dev) | |
1703 | return printk("%s(NULL device *): %pV", level, vaf); | |
1704 | ||
1705 | return printk("%s%s %s: %pV", | |
1706 | level, dev_driver_string(dev), dev_name(dev), vaf); | |
1707 | } | |
1708 | ||
1709 | int dev_printk(const char *level, const struct device *dev, | |
1710 | const char *fmt, ...) | |
1711 | { | |
1712 | struct va_format vaf; | |
1713 | va_list args; | |
1714 | int r; | |
1715 | ||
1716 | va_start(args, fmt); | |
1717 | ||
1718 | vaf.fmt = fmt; | |
1719 | vaf.va = &args; | |
1720 | ||
1721 | r = __dev_printk(level, dev, &vaf); | |
1722 | va_end(args); | |
1723 | ||
1724 | return r; | |
1725 | } | |
1726 | EXPORT_SYMBOL(dev_printk); | |
1727 | ||
1728 | #define define_dev_printk_level(func, kern_level) \ | |
1729 | int func(const struct device *dev, const char *fmt, ...) \ | |
1730 | { \ | |
1731 | struct va_format vaf; \ | |
1732 | va_list args; \ | |
1733 | int r; \ | |
1734 | \ | |
1735 | va_start(args, fmt); \ | |
1736 | \ | |
1737 | vaf.fmt = fmt; \ | |
1738 | vaf.va = &args; \ | |
1739 | \ | |
1740 | r = __dev_printk(kern_level, dev, &vaf); \ | |
1741 | va_end(args); \ | |
1742 | \ | |
1743 | return r; \ | |
1744 | } \ | |
1745 | EXPORT_SYMBOL(func); | |
1746 | ||
1747 | define_dev_printk_level(dev_emerg, KERN_EMERG); | |
1748 | define_dev_printk_level(dev_alert, KERN_ALERT); | |
1749 | define_dev_printk_level(dev_crit, KERN_CRIT); | |
1750 | define_dev_printk_level(dev_err, KERN_ERR); | |
1751 | define_dev_printk_level(dev_warn, KERN_WARNING); | |
1752 | define_dev_printk_level(dev_notice, KERN_NOTICE); | |
1753 | define_dev_printk_level(_dev_info, KERN_INFO); | |
1754 | ||
1755 | #endif |