Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
23681e47 | 19 | #include <linux/kdev_t.h> |
116af378 | 20 | #include <linux/notifier.h> |
da231fd5 | 21 | #include <linux/genhd.h> |
815d2d50 | 22 | #include <linux/kallsyms.h> |
6188e10d | 23 | #include <linux/semaphore.h> |
1da177e4 LT |
24 | |
25 | #include "base.h" | |
26 | #include "power/power.h" | |
27 | ||
4a3ad20c GKH |
28 | int (*platform_notify)(struct device *dev) = NULL; |
29 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
1da177e4 | 30 | |
4e886c29 GKH |
31 | #ifdef CONFIG_BLOCK |
32 | static inline int device_is_not_partition(struct device *dev) | |
33 | { | |
34 | return !(dev->type == &part_type); | |
35 | } | |
36 | #else | |
37 | static inline int device_is_not_partition(struct device *dev) | |
38 | { | |
39 | return 1; | |
40 | } | |
41 | #endif | |
1da177e4 | 42 | |
3e95637a AS |
43 | /** |
44 | * dev_driver_string - Return a device's driver name, if at all possible | |
45 | * @dev: struct device to get the name of | |
46 | * | |
47 | * Will return the device's driver's name if it is bound to a device. If | |
48 | * the device is not bound to a device, it will return the name of the bus | |
49 | * it is attached to. If it is not attached to a bus either, an empty | |
50 | * string will be returned. | |
51 | */ | |
52 | const char *dev_driver_string(struct device *dev) | |
53 | { | |
54 | return dev->driver ? dev->driver->name : | |
a456b702 JD |
55 | (dev->bus ? dev->bus->name : |
56 | (dev->class ? dev->class->name : "")); | |
3e95637a | 57 | } |
310a922d | 58 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 59 | |
1da177e4 LT |
60 | #define to_dev(obj) container_of(obj, struct device, kobj) |
61 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
62 | ||
4a3ad20c GKH |
63 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
64 | char *buf) | |
1da177e4 | 65 | { |
4a3ad20c GKH |
66 | struct device_attribute *dev_attr = to_dev_attr(attr); |
67 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 68 | ssize_t ret = -EIO; |
1da177e4 LT |
69 | |
70 | if (dev_attr->show) | |
54b6f35c | 71 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
72 | if (ret >= (ssize_t)PAGE_SIZE) { |
73 | print_symbol("dev_attr_show: %s returned bad count\n", | |
74 | (unsigned long)dev_attr->show); | |
75 | } | |
1da177e4 LT |
76 | return ret; |
77 | } | |
78 | ||
4a3ad20c GKH |
79 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
80 | const char *buf, size_t count) | |
1da177e4 | 81 | { |
4a3ad20c GKH |
82 | struct device_attribute *dev_attr = to_dev_attr(attr); |
83 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 84 | ssize_t ret = -EIO; |
1da177e4 LT |
85 | |
86 | if (dev_attr->store) | |
54b6f35c | 87 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
88 | return ret; |
89 | } | |
90 | ||
91 | static struct sysfs_ops dev_sysfs_ops = { | |
92 | .show = dev_attr_show, | |
93 | .store = dev_attr_store, | |
94 | }; | |
95 | ||
96 | ||
97 | /** | |
98 | * device_release - free device structure. | |
99 | * @kobj: device's kobject. | |
100 | * | |
101 | * This is called once the reference count for the object | |
102 | * reaches 0. We forward the call to the device's release | |
103 | * method, which should handle actually freeing the structure. | |
104 | */ | |
4a3ad20c | 105 | static void device_release(struct kobject *kobj) |
1da177e4 | 106 | { |
4a3ad20c | 107 | struct device *dev = to_dev(kobj); |
1da177e4 LT |
108 | |
109 | if (dev->release) | |
110 | dev->release(dev); | |
f9f852df KS |
111 | else if (dev->type && dev->type->release) |
112 | dev->type->release(dev); | |
2620efef GKH |
113 | else if (dev->class && dev->class->dev_release) |
114 | dev->class->dev_release(dev); | |
1da177e4 | 115 | else { |
4a3ad20c GKH |
116 | printk(KERN_ERR "Device '%s' does not have a release() " |
117 | "function, it is broken and must be fixed.\n", | |
1da177e4 LT |
118 | dev->bus_id); |
119 | WARN_ON(1); | |
120 | } | |
121 | } | |
122 | ||
8f4afc41 | 123 | static struct kobj_type device_ktype = { |
1da177e4 LT |
124 | .release = device_release, |
125 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
126 | }; |
127 | ||
128 | ||
312c004d | 129 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
130 | { |
131 | struct kobj_type *ktype = get_ktype(kobj); | |
132 | ||
8f4afc41 | 133 | if (ktype == &device_ktype) { |
1da177e4 | 134 | struct device *dev = to_dev(kobj); |
83b5fb4c CH |
135 | if (dev->uevent_suppress) |
136 | return 0; | |
1da177e4 LT |
137 | if (dev->bus) |
138 | return 1; | |
23681e47 GKH |
139 | if (dev->class) |
140 | return 1; | |
1da177e4 LT |
141 | } |
142 | return 0; | |
143 | } | |
144 | ||
312c004d | 145 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
146 | { |
147 | struct device *dev = to_dev(kobj); | |
148 | ||
23681e47 GKH |
149 | if (dev->bus) |
150 | return dev->bus->name; | |
151 | if (dev->class) | |
152 | return dev->class->name; | |
153 | return NULL; | |
1da177e4 LT |
154 | } |
155 | ||
7eff2e7a KS |
156 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
157 | struct kobj_uevent_env *env) | |
1da177e4 LT |
158 | { |
159 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
160 | int retval = 0; |
161 | ||
23681e47 GKH |
162 | /* add the major/minor if present */ |
163 | if (MAJOR(dev->devt)) { | |
7eff2e7a KS |
164 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
165 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
23681e47 GKH |
166 | } |
167 | ||
414264f9 | 168 | if (dev->type && dev->type->name) |
7eff2e7a | 169 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 170 | |
239378f1 | 171 | if (dev->driver) |
7eff2e7a | 172 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 173 | |
a87cb2ac | 174 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
175 | if (dev->class) { |
176 | struct device *parent = dev->parent; | |
177 | ||
178 | /* find first bus device in parent chain */ | |
179 | while (parent && !parent->bus) | |
180 | parent = parent->parent; | |
181 | if (parent && parent->bus) { | |
182 | const char *path; | |
183 | ||
184 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 185 | if (path) { |
7eff2e7a | 186 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
187 | kfree(path); |
188 | } | |
239378f1 | 189 | |
7eff2e7a | 190 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
191 | |
192 | if (parent->driver) | |
7eff2e7a KS |
193 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
194 | parent->driver->name); | |
239378f1 KS |
195 | } |
196 | } else if (dev->bus) { | |
7eff2e7a | 197 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
198 | |
199 | if (dev->driver) | |
4a3ad20c GKH |
200 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
201 | dev->driver->name); | |
d81d9d6b | 202 | } |
239378f1 | 203 | #endif |
1da177e4 | 204 | |
7eff2e7a | 205 | /* have the bus specific function add its stuff */ |
312c004d | 206 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 207 | retval = dev->bus->uevent(dev, env); |
f9f852df | 208 | if (retval) |
7dc72b28 | 209 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
2b3a302a | 210 | dev->bus_id, __func__, retval); |
1da177e4 LT |
211 | } |
212 | ||
7eff2e7a | 213 | /* have the class specific function add its stuff */ |
2620efef | 214 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 215 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 216 | if (retval) |
7dc72b28 GKH |
217 | pr_debug("device: '%s': %s: class uevent() " |
218 | "returned %d\n", dev->bus_id, | |
2b3a302a | 219 | __func__, retval); |
f9f852df KS |
220 | } |
221 | ||
7eff2e7a | 222 | /* have the device type specific fuction add its stuff */ |
f9f852df | 223 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 224 | retval = dev->type->uevent(dev, env); |
f9f852df | 225 | if (retval) |
7dc72b28 GKH |
226 | pr_debug("device: '%s': %s: dev_type uevent() " |
227 | "returned %d\n", dev->bus_id, | |
2b3a302a | 228 | __func__, retval); |
2620efef GKH |
229 | } |
230 | ||
1da177e4 LT |
231 | return retval; |
232 | } | |
233 | ||
312c004d KS |
234 | static struct kset_uevent_ops device_uevent_ops = { |
235 | .filter = dev_uevent_filter, | |
236 | .name = dev_uevent_name, | |
237 | .uevent = dev_uevent, | |
1da177e4 LT |
238 | }; |
239 | ||
16574dcc KS |
240 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
241 | char *buf) | |
242 | { | |
243 | struct kobject *top_kobj; | |
244 | struct kset *kset; | |
7eff2e7a | 245 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
246 | int i; |
247 | size_t count = 0; | |
248 | int retval; | |
249 | ||
250 | /* search the kset, the device belongs to */ | |
251 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
252 | while (!top_kobj->kset && top_kobj->parent) |
253 | top_kobj = top_kobj->parent; | |
16574dcc KS |
254 | if (!top_kobj->kset) |
255 | goto out; | |
5c5daf65 | 256 | |
16574dcc KS |
257 | kset = top_kobj->kset; |
258 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
259 | goto out; | |
260 | ||
261 | /* respect filter */ | |
262 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
263 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
264 | goto out; | |
265 | ||
7eff2e7a KS |
266 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
267 | if (!env) | |
c7308c81 GKH |
268 | return -ENOMEM; |
269 | ||
16574dcc | 270 | /* let the kset specific function add its keys */ |
7eff2e7a | 271 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
272 | if (retval) |
273 | goto out; | |
274 | ||
275 | /* copy keys to file */ | |
7eff2e7a KS |
276 | for (i = 0; i < env->envp_idx; i++) |
277 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 278 | out: |
7eff2e7a | 279 | kfree(env); |
16574dcc KS |
280 | return count; |
281 | } | |
282 | ||
a7fd6706 KS |
283 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
284 | const char *buf, size_t count) | |
285 | { | |
60a96a59 KS |
286 | enum kobject_action action; |
287 | ||
5c5daf65 | 288 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
289 | kobject_uevent(&dev->kobj, action); |
290 | goto out; | |
291 | } | |
292 | ||
293 | dev_err(dev, "uevent: unsupported action-string; this will " | |
294 | "be ignored in a future kernel version\n"); | |
312c004d | 295 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 296 | out: |
a7fd6706 KS |
297 | return count; |
298 | } | |
299 | ||
ad6a1e1c TH |
300 | static struct device_attribute uevent_attr = |
301 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
302 | ||
621a1672 DT |
303 | static int device_add_attributes(struct device *dev, |
304 | struct device_attribute *attrs) | |
de0ff00d | 305 | { |
621a1672 | 306 | int error = 0; |
de0ff00d | 307 | int i; |
621a1672 DT |
308 | |
309 | if (attrs) { | |
310 | for (i = 0; attr_name(attrs[i]); i++) { | |
311 | error = device_create_file(dev, &attrs[i]); | |
312 | if (error) | |
313 | break; | |
314 | } | |
315 | if (error) | |
316 | while (--i >= 0) | |
317 | device_remove_file(dev, &attrs[i]); | |
318 | } | |
319 | return error; | |
320 | } | |
321 | ||
322 | static void device_remove_attributes(struct device *dev, | |
323 | struct device_attribute *attrs) | |
324 | { | |
325 | int i; | |
326 | ||
327 | if (attrs) | |
328 | for (i = 0; attr_name(attrs[i]); i++) | |
329 | device_remove_file(dev, &attrs[i]); | |
330 | } | |
331 | ||
332 | static int device_add_groups(struct device *dev, | |
333 | struct attribute_group **groups) | |
334 | { | |
de0ff00d | 335 | int error = 0; |
621a1672 | 336 | int i; |
de0ff00d | 337 | |
621a1672 DT |
338 | if (groups) { |
339 | for (i = 0; groups[i]; i++) { | |
340 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
341 | if (error) { |
342 | while (--i >= 0) | |
4a3ad20c GKH |
343 | sysfs_remove_group(&dev->kobj, |
344 | groups[i]); | |
621a1672 | 345 | break; |
de0ff00d GKH |
346 | } |
347 | } | |
348 | } | |
de0ff00d GKH |
349 | return error; |
350 | } | |
351 | ||
621a1672 DT |
352 | static void device_remove_groups(struct device *dev, |
353 | struct attribute_group **groups) | |
de0ff00d GKH |
354 | { |
355 | int i; | |
621a1672 DT |
356 | |
357 | if (groups) | |
358 | for (i = 0; groups[i]; i++) | |
359 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
360 | } |
361 | ||
2620efef GKH |
362 | static int device_add_attrs(struct device *dev) |
363 | { | |
364 | struct class *class = dev->class; | |
f9f852df | 365 | struct device_type *type = dev->type; |
621a1672 | 366 | int error; |
2620efef | 367 | |
621a1672 DT |
368 | if (class) { |
369 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 370 | if (error) |
621a1672 | 371 | return error; |
2620efef | 372 | } |
f9f852df | 373 | |
621a1672 DT |
374 | if (type) { |
375 | error = device_add_groups(dev, type->groups); | |
f9f852df | 376 | if (error) |
621a1672 | 377 | goto err_remove_class_attrs; |
f9f852df KS |
378 | } |
379 | ||
621a1672 DT |
380 | error = device_add_groups(dev, dev->groups); |
381 | if (error) | |
382 | goto err_remove_type_groups; | |
383 | ||
384 | return 0; | |
385 | ||
386 | err_remove_type_groups: | |
387 | if (type) | |
388 | device_remove_groups(dev, type->groups); | |
389 | err_remove_class_attrs: | |
390 | if (class) | |
391 | device_remove_attributes(dev, class->dev_attrs); | |
392 | ||
2620efef GKH |
393 | return error; |
394 | } | |
395 | ||
396 | static void device_remove_attrs(struct device *dev) | |
397 | { | |
398 | struct class *class = dev->class; | |
f9f852df | 399 | struct device_type *type = dev->type; |
2620efef | 400 | |
621a1672 | 401 | device_remove_groups(dev, dev->groups); |
f9f852df | 402 | |
621a1672 DT |
403 | if (type) |
404 | device_remove_groups(dev, type->groups); | |
405 | ||
406 | if (class) | |
407 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
408 | } |
409 | ||
410 | ||
23681e47 GKH |
411 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
412 | char *buf) | |
413 | { | |
414 | return print_dev_t(buf, dev->devt); | |
415 | } | |
416 | ||
ad6a1e1c TH |
417 | static struct device_attribute devt_attr = |
418 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
419 | ||
881c6cfd GKH |
420 | /* kset to create /sys/devices/ */ |
421 | struct kset *devices_kset; | |
1da177e4 | 422 | |
1da177e4 | 423 | /** |
4a3ad20c GKH |
424 | * device_create_file - create sysfs attribute file for device. |
425 | * @dev: device. | |
426 | * @attr: device attribute descriptor. | |
1da177e4 | 427 | */ |
4a3ad20c | 428 | int device_create_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
429 | { |
430 | int error = 0; | |
0c98b19f | 431 | if (dev) |
1da177e4 | 432 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
433 | return error; |
434 | } | |
435 | ||
436 | /** | |
4a3ad20c GKH |
437 | * device_remove_file - remove sysfs attribute file. |
438 | * @dev: device. | |
439 | * @attr: device attribute descriptor. | |
1da177e4 | 440 | */ |
4a3ad20c | 441 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
1da177e4 | 442 | { |
0c98b19f | 443 | if (dev) |
1da177e4 | 444 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
445 | } |
446 | ||
2589f188 GKH |
447 | /** |
448 | * device_create_bin_file - create sysfs binary attribute file for device. | |
449 | * @dev: device. | |
450 | * @attr: device binary attribute descriptor. | |
451 | */ | |
452 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
453 | { | |
454 | int error = -EINVAL; | |
455 | if (dev) | |
456 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
457 | return error; | |
458 | } | |
459 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
460 | ||
461 | /** | |
462 | * device_remove_bin_file - remove sysfs binary attribute file | |
463 | * @dev: device. | |
464 | * @attr: device binary attribute descriptor. | |
465 | */ | |
466 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
467 | { | |
468 | if (dev) | |
469 | sysfs_remove_bin_file(&dev->kobj, attr); | |
470 | } | |
471 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
472 | ||
d9a9cdfb | 473 | /** |
523ded71 | 474 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
475 | * @dev: device. |
476 | * @func: callback function to invoke later. | |
523ded71 | 477 | * @owner: module owning the callback routine |
d9a9cdfb AS |
478 | * |
479 | * Attribute methods must not unregister themselves or their parent device | |
480 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
481 | * since unregistration is mutually exclusive with driver callbacks. | |
482 | * | |
483 | * Instead methods can call this routine, which will attempt to allocate | |
484 | * and schedule a workqueue request to call back @func with @dev as its | |
485 | * argument in the workqueue's process context. @dev will be pinned until | |
486 | * @func returns. | |
487 | * | |
523ded71 AS |
488 | * This routine is usually called via the inline device_schedule_callback(), |
489 | * which automatically sets @owner to THIS_MODULE. | |
490 | * | |
d9a9cdfb | 491 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 492 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
493 | * |
494 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
495 | * underlying sysfs routine (since it is intended for use by attribute | |
496 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
497 | */ | |
523ded71 AS |
498 | int device_schedule_callback_owner(struct device *dev, |
499 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
500 | { |
501 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 502 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 503 | } |
523ded71 | 504 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 505 | |
34bb61f9 JB |
506 | static void klist_children_get(struct klist_node *n) |
507 | { | |
508 | struct device *dev = container_of(n, struct device, knode_parent); | |
509 | ||
510 | get_device(dev); | |
511 | } | |
512 | ||
513 | static void klist_children_put(struct klist_node *n) | |
514 | { | |
515 | struct device *dev = container_of(n, struct device, knode_parent); | |
516 | ||
517 | put_device(dev); | |
518 | } | |
519 | ||
1da177e4 | 520 | /** |
4a3ad20c GKH |
521 | * device_initialize - init device structure. |
522 | * @dev: device. | |
1da177e4 | 523 | * |
4a3ad20c GKH |
524 | * This prepares the device for use by other layers, |
525 | * including adding it to the device hierarchy. | |
526 | * It is the first half of device_register(), if called by | |
527 | * that, though it can also be called separately, so one | |
528 | * may use @dev's fields (e.g. the refcount). | |
1da177e4 | 529 | */ |
1da177e4 LT |
530 | void device_initialize(struct device *dev) |
531 | { | |
881c6cfd | 532 | dev->kobj.kset = devices_kset; |
f9cb074b | 533 | kobject_init(&dev->kobj, &device_ktype); |
34bb61f9 JB |
534 | klist_init(&dev->klist_children, klist_children_get, |
535 | klist_children_put); | |
1da177e4 | 536 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 537 | INIT_LIST_HEAD(&dev->node); |
af70316a | 538 | init_MUTEX(&dev->sem); |
9ac7849e TH |
539 | spin_lock_init(&dev->devres_lock); |
540 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 541 | device_init_wakeup(dev, 0); |
87348136 | 542 | set_dev_node(dev, -1); |
1da177e4 LT |
543 | } |
544 | ||
40fa5422 | 545 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
546 | static struct kobject *get_device_parent(struct device *dev, |
547 | struct device *parent) | |
40fa5422 | 548 | { |
da231fd5 | 549 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 550 | if (dev->class && (!parent || parent->class != dev->class)) |
823bccfc | 551 | return &dev->class->subsys.kobj; |
da231fd5 | 552 | /* all other devices keep their parent */ |
40fa5422 | 553 | else if (parent) |
c744aeae | 554 | return &parent->kobj; |
40fa5422 | 555 | |
c744aeae | 556 | return NULL; |
40fa5422 | 557 | } |
da231fd5 KS |
558 | |
559 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
560 | static inline void cleanup_glue_dir(struct device *dev, |
561 | struct kobject *glue_dir) {} | |
40fa5422 | 562 | #else |
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 | ||
da231fd5 KS |
574 | static struct kobject *get_device_parent(struct device *dev, |
575 | struct device *parent) | |
40fa5422 | 576 | { |
43968d2f GKH |
577 | int retval; |
578 | ||
86406245 KS |
579 | if (dev->class) { |
580 | struct kobject *kobj = NULL; | |
581 | struct kobject *parent_kobj; | |
582 | struct kobject *k; | |
583 | ||
584 | /* | |
585 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
586 | * Class-devices with a non class-device as parent, live |
587 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
588 | */ |
589 | if (parent == NULL) | |
590 | parent_kobj = virtual_device_parent(dev); | |
591 | else if (parent->class) | |
592 | return &parent->kobj; | |
593 | else | |
594 | parent_kobj = &parent->kobj; | |
595 | ||
596 | /* find our class-directory at the parent and reference it */ | |
597 | spin_lock(&dev->class->class_dirs.list_lock); | |
598 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
599 | if (k->parent == parent_kobj) { | |
600 | kobj = kobject_get(k); | |
601 | break; | |
602 | } | |
603 | spin_unlock(&dev->class->class_dirs.list_lock); | |
604 | if (kobj) | |
605 | return kobj; | |
606 | ||
607 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
608 | k = kobject_create(); |
609 | if (!k) | |
610 | return NULL; | |
611 | k->kset = &dev->class->class_dirs; | |
b2d6db58 | 612 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f GKH |
613 | if (retval < 0) { |
614 | kobject_put(k); | |
615 | return NULL; | |
616 | } | |
0f4dafc0 | 617 | /* do not emit an uevent for this simple "glue" directory */ |
43968d2f | 618 | return k; |
86406245 KS |
619 | } |
620 | ||
621 | if (parent) | |
c744aeae CH |
622 | return &parent->kobj; |
623 | return NULL; | |
624 | } | |
da231fd5 | 625 | |
63b6971a | 626 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 627 | { |
0f4dafc0 | 628 | /* see if we live in a "glue" directory */ |
c1fe539a CH |
629 | if (!glue_dir || !dev->class || |
630 | glue_dir->kset != &dev->class->class_dirs) | |
da231fd5 KS |
631 | return; |
632 | ||
0f4dafc0 | 633 | kobject_put(glue_dir); |
da231fd5 | 634 | } |
63b6971a CH |
635 | |
636 | static void cleanup_device_parent(struct device *dev) | |
637 | { | |
638 | cleanup_glue_dir(dev, dev->kobj.parent); | |
639 | } | |
c744aeae | 640 | #endif |
86406245 | 641 | |
63b6971a | 642 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
643 | { |
644 | struct kobject *kobj; | |
645 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
646 | if (kobj) |
647 | dev->kobj.parent = kobj; | |
40fa5422 | 648 | } |
40fa5422 | 649 | |
2ee97caf CH |
650 | static int device_add_class_symlinks(struct device *dev) |
651 | { | |
652 | int error; | |
653 | ||
654 | if (!dev->class) | |
655 | return 0; | |
da231fd5 | 656 | |
2ee97caf CH |
657 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, |
658 | "subsystem"); | |
659 | if (error) | |
660 | goto out; | |
da231fd5 KS |
661 | |
662 | #ifdef CONFIG_SYSFS_DEPRECATED | |
663 | /* stacked class devices need a symlink in the class directory */ | |
edfaa7c3 | 664 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
4e886c29 | 665 | device_is_not_partition(dev)) { |
2ee97caf CH |
666 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
667 | dev->bus_id); | |
668 | if (error) | |
669 | goto out_subsys; | |
670 | } | |
da231fd5 | 671 | |
4e886c29 | 672 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
673 | struct device *parent = dev->parent; |
674 | char *class_name; | |
4f01a757 | 675 | |
da231fd5 KS |
676 | /* |
677 | * stacked class devices have the 'device' link | |
678 | * pointing to the bus device instead of the parent | |
679 | */ | |
680 | while (parent->class && !parent->bus && parent->parent) | |
681 | parent = parent->parent; | |
682 | ||
683 | error = sysfs_create_link(&dev->kobj, | |
684 | &parent->kobj, | |
4f01a757 DT |
685 | "device"); |
686 | if (error) | |
687 | goto out_busid; | |
da231fd5 KS |
688 | |
689 | class_name = make_class_name(dev->class->name, | |
690 | &dev->kobj); | |
691 | if (class_name) | |
692 | error = sysfs_create_link(&dev->parent->kobj, | |
693 | &dev->kobj, class_name); | |
694 | kfree(class_name); | |
695 | if (error) | |
696 | goto out_device; | |
2ee97caf CH |
697 | } |
698 | return 0; | |
699 | ||
2ee97caf | 700 | out_device: |
4e886c29 | 701 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 702 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 703 | out_busid: |
edfaa7c3 | 704 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
4e886c29 | 705 | device_is_not_partition(dev)) |
2ee97caf | 706 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
da231fd5 KS |
707 | #else |
708 | /* link in the class directory pointing to the device */ | |
709 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
710 | dev->bus_id); | |
711 | if (error) | |
712 | goto out_subsys; | |
713 | ||
4e886c29 | 714 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
715 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
716 | "device"); | |
717 | if (error) | |
718 | goto out_busid; | |
719 | } | |
720 | return 0; | |
721 | ||
722 | out_busid: | |
723 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
724 | #endif | |
725 | ||
2ee97caf CH |
726 | out_subsys: |
727 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
728 | out: | |
729 | return error; | |
730 | } | |
731 | ||
732 | static void device_remove_class_symlinks(struct device *dev) | |
733 | { | |
734 | if (!dev->class) | |
735 | return; | |
da231fd5 | 736 | |
2ee97caf | 737 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 738 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
739 | char *class_name; |
740 | ||
741 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
742 | if (class_name) { | |
743 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
744 | kfree(class_name); | |
745 | } | |
2ee97caf CH |
746 | sysfs_remove_link(&dev->kobj, "device"); |
747 | } | |
da231fd5 | 748 | |
edfaa7c3 | 749 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
4e886c29 | 750 | device_is_not_partition(dev)) |
2ee97caf | 751 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
da231fd5 | 752 | #else |
4e886c29 | 753 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
754 | sysfs_remove_link(&dev->kobj, "device"); |
755 | ||
756 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
757 | #endif | |
758 | ||
2ee97caf CH |
759 | sysfs_remove_link(&dev->kobj, "subsystem"); |
760 | } | |
761 | ||
1da177e4 | 762 | /** |
4a3ad20c GKH |
763 | * device_add - add device to device hierarchy. |
764 | * @dev: device. | |
1da177e4 | 765 | * |
4a3ad20c GKH |
766 | * This is part 2 of device_register(), though may be called |
767 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 768 | * |
4a3ad20c GKH |
769 | * This adds it to the kobject hierarchy via kobject_add(), adds it |
770 | * to the global and sibling lists for the device, then | |
771 | * adds it to the other relevant subsystems of the driver model. | |
1da177e4 LT |
772 | */ |
773 | int device_add(struct device *dev) | |
774 | { | |
775 | struct device *parent = NULL; | |
c47ed219 | 776 | struct class_interface *class_intf; |
775b64d2 RW |
777 | int error; |
778 | ||
1da177e4 | 779 | dev = get_device(dev); |
775b64d2 RW |
780 | if (!dev || !strlen(dev->bus_id)) { |
781 | error = -EINVAL; | |
c1fe539a | 782 | goto Done; |
775b64d2 | 783 | } |
1da177e4 | 784 | |
2b3a302a | 785 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
c205ef48 | 786 | |
1da177e4 | 787 | parent = get_device(dev->parent); |
63b6971a | 788 | setup_parent(dev, parent); |
1da177e4 | 789 | |
0d358f22 YL |
790 | /* use parent numa_node */ |
791 | if (parent) | |
792 | set_dev_node(dev, dev_to_node(parent)); | |
793 | ||
1da177e4 | 794 | /* first, register with generic layer. */ |
b2d6db58 | 795 | error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
40fa5422 | 796 | if (error) |
1da177e4 | 797 | goto Error; |
a7fd6706 | 798 | |
37022644 BW |
799 | /* notify platform of device entry */ |
800 | if (platform_notify) | |
801 | platform_notify(dev); | |
802 | ||
116af378 BH |
803 | /* notify clients of device entry (new way) */ |
804 | if (dev->bus) | |
c6f7e72a | 805 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
806 | BUS_NOTIFY_ADD_DEVICE, dev); |
807 | ||
ad6a1e1c | 808 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
809 | if (error) |
810 | goto attrError; | |
a7fd6706 | 811 | |
23681e47 | 812 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
813 | error = device_create_file(dev, &devt_attr); |
814 | if (error) | |
a306eea4 | 815 | goto ueventattrError; |
23681e47 GKH |
816 | } |
817 | ||
2ee97caf CH |
818 | error = device_add_class_symlinks(dev); |
819 | if (error) | |
820 | goto SymlinkError; | |
dc0afa83 CH |
821 | error = device_add_attrs(dev); |
822 | if (error) | |
2620efef | 823 | goto AttrsError; |
dc0afa83 CH |
824 | error = bus_add_device(dev); |
825 | if (error) | |
1da177e4 | 826 | goto BusError; |
57eee3d2 RW |
827 | error = device_pm_add(dev); |
828 | if (error) | |
829 | goto PMError; | |
83b5fb4c | 830 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 831 | bus_attach_device(dev); |
1da177e4 | 832 | if (parent) |
d856f1e3 | 833 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 834 | |
5d9fd169 | 835 | if (dev->class) { |
5d9fd169 | 836 | down(&dev->class->sem); |
c47ed219 | 837 | /* tie the class to the device */ |
5d9fd169 | 838 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
839 | |
840 | /* notify any interfaces that the device is here */ | |
841 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
842 | if (class_intf->add_dev) | |
843 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
844 | up(&dev->class->sem); |
845 | } | |
1da177e4 LT |
846 | Done: |
847 | put_device(dev); | |
848 | return error; | |
1da177e4 | 849 | PMError: |
57eee3d2 RW |
850 | bus_remove_device(dev); |
851 | BusError: | |
116af378 | 852 | if (dev->bus) |
c6f7e72a | 853 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 854 | BUS_NOTIFY_DEL_DEVICE, dev); |
82f0cf9b | 855 | device_remove_attrs(dev); |
2620efef | 856 | AttrsError: |
2ee97caf CH |
857 | device_remove_class_symlinks(dev); |
858 | SymlinkError: | |
ad6a1e1c TH |
859 | if (MAJOR(dev->devt)) |
860 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 861 | ueventattrError: |
ad6a1e1c | 862 | device_remove_file(dev, &uevent_attr); |
23681e47 | 863 | attrError: |
312c004d | 864 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
865 | kobject_del(&dev->kobj); |
866 | Error: | |
63b6971a | 867 | cleanup_device_parent(dev); |
1da177e4 LT |
868 | if (parent) |
869 | put_device(parent); | |
870 | goto Done; | |
871 | } | |
872 | ||
1da177e4 | 873 | /** |
4a3ad20c GKH |
874 | * device_register - register a device with the system. |
875 | * @dev: pointer to the device structure | |
1da177e4 | 876 | * |
4a3ad20c GKH |
877 | * This happens in two clean steps - initialize the device |
878 | * and add it to the system. The two steps can be called | |
879 | * separately, but this is the easiest and most common. | |
880 | * I.e. you should only call the two helpers separately if | |
881 | * have a clearly defined need to use and refcount the device | |
882 | * before it is added to the hierarchy. | |
1da177e4 | 883 | */ |
1da177e4 LT |
884 | int device_register(struct device *dev) |
885 | { | |
886 | device_initialize(dev); | |
887 | return device_add(dev); | |
888 | } | |
889 | ||
1da177e4 | 890 | /** |
4a3ad20c GKH |
891 | * get_device - increment reference count for device. |
892 | * @dev: device. | |
1da177e4 | 893 | * |
4a3ad20c GKH |
894 | * This simply forwards the call to kobject_get(), though |
895 | * we do take care to provide for the case that we get a NULL | |
896 | * pointer passed in. | |
1da177e4 | 897 | */ |
4a3ad20c | 898 | struct device *get_device(struct device *dev) |
1da177e4 LT |
899 | { |
900 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
901 | } | |
902 | ||
1da177e4 | 903 | /** |
4a3ad20c GKH |
904 | * put_device - decrement reference count. |
905 | * @dev: device in question. | |
1da177e4 | 906 | */ |
4a3ad20c | 907 | void put_device(struct device *dev) |
1da177e4 | 908 | { |
edfaa7c3 | 909 | /* might_sleep(); */ |
1da177e4 LT |
910 | if (dev) |
911 | kobject_put(&dev->kobj); | |
912 | } | |
913 | ||
1da177e4 | 914 | /** |
4a3ad20c GKH |
915 | * device_del - delete device from system. |
916 | * @dev: device. | |
1da177e4 | 917 | * |
4a3ad20c GKH |
918 | * This is the first part of the device unregistration |
919 | * sequence. This removes the device from the lists we control | |
920 | * from here, has it removed from the other driver model | |
921 | * subsystems it was added to in device_add(), and removes it | |
922 | * from the kobject hierarchy. | |
1da177e4 | 923 | * |
4a3ad20c GKH |
924 | * NOTE: this should be called manually _iff_ device_add() was |
925 | * also called manually. | |
1da177e4 | 926 | */ |
4a3ad20c | 927 | void device_del(struct device *dev) |
1da177e4 | 928 | { |
4a3ad20c | 929 | struct device *parent = dev->parent; |
c47ed219 | 930 | struct class_interface *class_intf; |
1da177e4 | 931 | |
775b64d2 | 932 | device_pm_remove(dev); |
1da177e4 | 933 | if (parent) |
d62c0f9f | 934 | klist_del(&dev->knode_parent); |
ad6a1e1c TH |
935 | if (MAJOR(dev->devt)) |
936 | device_remove_file(dev, &devt_attr); | |
b9d9c82b | 937 | if (dev->class) { |
da231fd5 | 938 | device_remove_class_symlinks(dev); |
99ef3ef8 | 939 | |
5d9fd169 | 940 | down(&dev->class->sem); |
c47ed219 GKH |
941 | /* notify any interfaces that the device is now gone */ |
942 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
943 | if (class_intf->remove_dev) | |
944 | class_intf->remove_dev(dev, class_intf); | |
945 | /* remove the device from the class list */ | |
5d9fd169 GKH |
946 | list_del_init(&dev->node); |
947 | up(&dev->class->sem); | |
b9d9c82b | 948 | } |
ad6a1e1c | 949 | device_remove_file(dev, &uevent_attr); |
2620efef | 950 | device_remove_attrs(dev); |
28953533 | 951 | bus_remove_device(dev); |
1da177e4 | 952 | |
2f8d16a9 TH |
953 | /* |
954 | * Some platform devices are driven without driver attached | |
955 | * and managed resources may have been acquired. Make sure | |
956 | * all resources are released. | |
957 | */ | |
958 | devres_release_all(dev); | |
959 | ||
1da177e4 LT |
960 | /* Notify the platform of the removal, in case they |
961 | * need to do anything... | |
962 | */ | |
963 | if (platform_notify_remove) | |
964 | platform_notify_remove(dev); | |
116af378 | 965 | if (dev->bus) |
c6f7e72a | 966 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 967 | BUS_NOTIFY_DEL_DEVICE, dev); |
312c004d | 968 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 969 | cleanup_device_parent(dev); |
1da177e4 | 970 | kobject_del(&dev->kobj); |
da231fd5 | 971 | put_device(parent); |
1da177e4 LT |
972 | } |
973 | ||
974 | /** | |
4a3ad20c GKH |
975 | * device_unregister - unregister device from system. |
976 | * @dev: device going away. | |
1da177e4 | 977 | * |
4a3ad20c GKH |
978 | * We do this in two parts, like we do device_register(). First, |
979 | * we remove it from all the subsystems with device_del(), then | |
980 | * we decrement the reference count via put_device(). If that | |
981 | * is the final reference count, the device will be cleaned up | |
982 | * via device_release() above. Otherwise, the structure will | |
983 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 984 | */ |
4a3ad20c | 985 | void device_unregister(struct device *dev) |
1da177e4 | 986 | { |
2b3a302a | 987 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
1da177e4 LT |
988 | device_del(dev); |
989 | put_device(dev); | |
990 | } | |
991 | ||
4a3ad20c | 992 | static struct device *next_device(struct klist_iter *i) |
36239577 | 993 | { |
4a3ad20c | 994 | struct klist_node *n = klist_next(i); |
36239577 | 995 | return n ? container_of(n, struct device, knode_parent) : NULL; |
996 | } | |
997 | ||
1da177e4 | 998 | /** |
4a3ad20c GKH |
999 | * device_for_each_child - device child iterator. |
1000 | * @parent: parent struct device. | |
1001 | * @data: data for the callback. | |
1002 | * @fn: function to be called for each device. | |
1da177e4 | 1003 | * |
4a3ad20c GKH |
1004 | * Iterate over @parent's child devices, and call @fn for each, |
1005 | * passing it @data. | |
1da177e4 | 1006 | * |
4a3ad20c GKH |
1007 | * We check the return of @fn each time. If it returns anything |
1008 | * other than 0, we break out and return that value. | |
1da177e4 | 1009 | */ |
4a3ad20c GKH |
1010 | int device_for_each_child(struct device *parent, void *data, |
1011 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1012 | { |
36239577 | 1013 | struct klist_iter i; |
4a3ad20c | 1014 | struct device *child; |
1da177e4 LT |
1015 | int error = 0; |
1016 | ||
36239577 | 1017 | klist_iter_init(&parent->klist_children, &i); |
1018 | while ((child = next_device(&i)) && !error) | |
1019 | error = fn(child, data); | |
1020 | klist_iter_exit(&i); | |
1da177e4 LT |
1021 | return error; |
1022 | } | |
1023 | ||
5ab69981 CH |
1024 | /** |
1025 | * device_find_child - device iterator for locating a particular device. | |
1026 | * @parent: parent struct device | |
1027 | * @data: Data to pass to match function | |
1028 | * @match: Callback function to check device | |
1029 | * | |
1030 | * This is similar to the device_for_each_child() function above, but it | |
1031 | * returns a reference to a device that is 'found' for later use, as | |
1032 | * determined by the @match callback. | |
1033 | * | |
1034 | * The callback should return 0 if the device doesn't match and non-zero | |
1035 | * if it does. If the callback returns non-zero and a reference to the | |
1036 | * current device can be obtained, this function will return to the caller | |
1037 | * and not iterate over any more devices. | |
1038 | */ | |
4a3ad20c GKH |
1039 | struct device *device_find_child(struct device *parent, void *data, |
1040 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1041 | { |
1042 | struct klist_iter i; | |
1043 | struct device *child; | |
1044 | ||
1045 | if (!parent) | |
1046 | return NULL; | |
1047 | ||
1048 | klist_iter_init(&parent->klist_children, &i); | |
1049 | while ((child = next_device(&i))) | |
1050 | if (match(child, data) && get_device(child)) | |
1051 | break; | |
1052 | klist_iter_exit(&i); | |
1053 | return child; | |
1054 | } | |
1055 | ||
1da177e4 LT |
1056 | int __init devices_init(void) |
1057 | { | |
881c6cfd GKH |
1058 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1059 | if (!devices_kset) | |
1060 | return -ENOMEM; | |
1061 | return 0; | |
1da177e4 LT |
1062 | } |
1063 | ||
1064 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1065 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1066 | |
1067 | EXPORT_SYMBOL_GPL(device_initialize); | |
1068 | EXPORT_SYMBOL_GPL(device_add); | |
1069 | EXPORT_SYMBOL_GPL(device_register); | |
1070 | ||
1071 | EXPORT_SYMBOL_GPL(device_del); | |
1072 | EXPORT_SYMBOL_GPL(device_unregister); | |
1073 | EXPORT_SYMBOL_GPL(get_device); | |
1074 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1075 | |
1076 | EXPORT_SYMBOL_GPL(device_create_file); | |
1077 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1078 | |
1079 | ||
1080 | static void device_create_release(struct device *dev) | |
1081 | { | |
2b3a302a | 1082 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
23681e47 GKH |
1083 | kfree(dev); |
1084 | } | |
1085 | ||
1086 | /** | |
1087 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1088 | * @class: pointer to the struct class that this device should be registered to |
1089 | * @parent: pointer to the parent struct device of this new device, if any | |
1090 | * @devt: the dev_t for the char device to be added | |
1091 | * @fmt: string for the device's name | |
1092 | * | |
1093 | * This function can be used by char device classes. A struct device | |
1094 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1095 | * |
23681e47 GKH |
1096 | * A "dev" file will be created, showing the dev_t for the device, if |
1097 | * the dev_t is not 0,0. | |
42734daf HK |
1098 | * If a pointer to a parent struct device is passed in, the newly created |
1099 | * struct device will be a child of that device in sysfs. | |
1100 | * The pointer to the struct device will be returned from the call. | |
1101 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1102 | * pointer. |
1103 | * | |
1104 | * Note: the struct class passed to this function must have previously | |
1105 | * been created with a call to class_create(). | |
1106 | */ | |
1107 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1108 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1109 | { |
1110 | va_list args; | |
1111 | struct device *dev = NULL; | |
1112 | int retval = -ENODEV; | |
1113 | ||
1114 | if (class == NULL || IS_ERR(class)) | |
1115 | goto error; | |
23681e47 GKH |
1116 | |
1117 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1118 | if (!dev) { | |
1119 | retval = -ENOMEM; | |
1120 | goto error; | |
1121 | } | |
1122 | ||
1123 | dev->devt = devt; | |
1124 | dev->class = class; | |
1125 | dev->parent = parent; | |
1126 | dev->release = device_create_release; | |
1127 | ||
1128 | va_start(args, fmt); | |
1129 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1130 | va_end(args); | |
1131 | retval = device_register(dev); | |
1132 | if (retval) | |
1133 | goto error; | |
1134 | ||
23681e47 GKH |
1135 | return dev; |
1136 | ||
1137 | error: | |
1138 | kfree(dev); | |
1139 | return ERR_PTR(retval); | |
1140 | } | |
1141 | EXPORT_SYMBOL_GPL(device_create); | |
1142 | ||
cd35449b | 1143 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1144 | { |
cd35449b | 1145 | dev_t *devt = data; |
23681e47 | 1146 | |
cd35449b | 1147 | return dev->devt == *devt; |
775b64d2 RW |
1148 | } |
1149 | ||
1150 | /** | |
1151 | * device_destroy - removes a device that was created with device_create() | |
1152 | * @class: pointer to the struct class that this device was registered with | |
1153 | * @devt: the dev_t of the device that was previously registered | |
1154 | * | |
1155 | * This call unregisters and cleans up a device that was created with a | |
1156 | * call to device_create(). | |
1157 | */ | |
1158 | void device_destroy(struct class *class, dev_t devt) | |
1159 | { | |
1160 | struct device *dev; | |
23681e47 | 1161 | |
cd35449b DY |
1162 | dev = class_find_device(class, &devt, __match_devt); |
1163 | if (dev) { | |
1164 | put_device(dev); | |
23681e47 | 1165 | device_unregister(dev); |
cd35449b | 1166 | } |
23681e47 GKH |
1167 | } |
1168 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1169 | |
1170 | /** | |
1171 | * device_rename - renames a device | |
1172 | * @dev: the pointer to the struct device to be renamed | |
1173 | * @new_name: the new name of the device | |
1174 | */ | |
1175 | int device_rename(struct device *dev, char *new_name) | |
1176 | { | |
1177 | char *old_class_name = NULL; | |
1178 | char *new_class_name = NULL; | |
2ee97caf | 1179 | char *old_device_name = NULL; |
a2de48ca GKH |
1180 | int error; |
1181 | ||
1182 | dev = get_device(dev); | |
1183 | if (!dev) | |
1184 | return -EINVAL; | |
1185 | ||
7dc72b28 | 1186 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
2b3a302a | 1187 | __func__, new_name); |
a2de48ca | 1188 | |
99ef3ef8 | 1189 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1190 | if ((dev->class) && (dev->parent)) |
1191 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1192 | #endif |
a2de48ca | 1193 | |
2ee97caf CH |
1194 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1195 | if (!old_device_name) { | |
1196 | error = -ENOMEM; | |
1197 | goto out; | |
a2de48ca | 1198 | } |
2ee97caf | 1199 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1200 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1201 | ||
1202 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1203 | if (error) { |
1204 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1205 | goto out; | |
1206 | } | |
a2de48ca | 1207 | |
99ef3ef8 | 1208 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1209 | if (old_class_name) { |
1210 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1211 | if (new_class_name) { | |
2ee97caf CH |
1212 | error = sysfs_create_link(&dev->parent->kobj, |
1213 | &dev->kobj, new_class_name); | |
1214 | if (error) | |
1215 | goto out; | |
a2de48ca GKH |
1216 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1217 | } | |
1218 | } | |
60b8cabd | 1219 | #else |
a2de48ca | 1220 | if (dev->class) { |
2ee97caf CH |
1221 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
1222 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
1223 | dev->bus_id); | |
1224 | if (error) { | |
2ee97caf | 1225 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", |
2b3a302a | 1226 | __func__, error); |
2ee97caf | 1227 | } |
a2de48ca | 1228 | } |
60b8cabd KS |
1229 | #endif |
1230 | ||
2ee97caf | 1231 | out: |
a2de48ca GKH |
1232 | put_device(dev); |
1233 | ||
a2de48ca | 1234 | kfree(new_class_name); |
952ab431 | 1235 | kfree(old_class_name); |
2ee97caf | 1236 | kfree(old_device_name); |
a2de48ca GKH |
1237 | |
1238 | return error; | |
1239 | } | |
a2807dbc | 1240 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1241 | |
1242 | static int device_move_class_links(struct device *dev, | |
1243 | struct device *old_parent, | |
1244 | struct device *new_parent) | |
1245 | { | |
f7f3461d | 1246 | int error = 0; |
8a82472f | 1247 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1248 | char *class_name; |
1249 | ||
1250 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1251 | if (!class_name) { | |
cb360bbf | 1252 | error = -ENOMEM; |
8a82472f CH |
1253 | goto out; |
1254 | } | |
1255 | if (old_parent) { | |
1256 | sysfs_remove_link(&dev->kobj, "device"); | |
1257 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1258 | } | |
c744aeae CH |
1259 | if (new_parent) { |
1260 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1261 | "device"); | |
1262 | if (error) | |
1263 | goto out; | |
1264 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1265 | class_name); | |
1266 | if (error) | |
1267 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1268 | } else |
c744aeae | 1269 | error = 0; |
8a82472f CH |
1270 | out: |
1271 | kfree(class_name); | |
1272 | return error; | |
1273 | #else | |
f7f3461d GKH |
1274 | if (old_parent) |
1275 | sysfs_remove_link(&dev->kobj, "device"); | |
1276 | if (new_parent) | |
1277 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1278 | "device"); | |
1279 | return error; | |
8a82472f CH |
1280 | #endif |
1281 | } | |
1282 | ||
1283 | /** | |
1284 | * device_move - moves a device to a new parent | |
1285 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1286 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1287 | */ |
1288 | int device_move(struct device *dev, struct device *new_parent) | |
1289 | { | |
1290 | int error; | |
1291 | struct device *old_parent; | |
c744aeae | 1292 | struct kobject *new_parent_kobj; |
8a82472f CH |
1293 | |
1294 | dev = get_device(dev); | |
1295 | if (!dev) | |
1296 | return -EINVAL; | |
1297 | ||
8a82472f | 1298 | new_parent = get_device(new_parent); |
4a3ad20c | 1299 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1300 | |
7dc72b28 | 1301 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
2b3a302a | 1302 | __func__, new_parent ? new_parent->bus_id : "<NULL>"); |
c744aeae | 1303 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1304 | if (error) { |
63b6971a | 1305 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1306 | put_device(new_parent); |
1307 | goto out; | |
1308 | } | |
1309 | old_parent = dev->parent; | |
1310 | dev->parent = new_parent; | |
1311 | if (old_parent) | |
acf02d23 | 1312 | klist_remove(&dev->knode_parent); |
0d358f22 | 1313 | if (new_parent) { |
c744aeae | 1314 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); |
0d358f22 YL |
1315 | set_dev_node(dev, dev_to_node(new_parent)); |
1316 | } | |
1317 | ||
8a82472f CH |
1318 | if (!dev->class) |
1319 | goto out_put; | |
1320 | error = device_move_class_links(dev, old_parent, new_parent); | |
1321 | if (error) { | |
1322 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1323 | device_move_class_links(dev, new_parent, old_parent); | |
1324 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1325 | if (new_parent) |
1326 | klist_remove(&dev->knode_parent); | |
0d358f22 YL |
1327 | dev->parent = old_parent; |
1328 | if (old_parent) { | |
8a82472f CH |
1329 | klist_add_tail(&dev->knode_parent, |
1330 | &old_parent->klist_children); | |
0d358f22 YL |
1331 | set_dev_node(dev, dev_to_node(old_parent)); |
1332 | } | |
8a82472f | 1333 | } |
63b6971a | 1334 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1335 | put_device(new_parent); |
1336 | goto out; | |
1337 | } | |
1338 | out_put: | |
1339 | put_device(old_parent); | |
1340 | out: | |
1341 | put_device(dev); | |
1342 | return error; | |
1343 | } | |
8a82472f | 1344 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1345 | |
1346 | /** | |
1347 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1348 | */ | |
1349 | void device_shutdown(void) | |
1350 | { | |
4a3ad20c | 1351 | struct device *dev, *devn; |
37b0c020 GKH |
1352 | |
1353 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1354 | kobj.entry) { | |
1355 | if (dev->bus && dev->bus->shutdown) { | |
1356 | dev_dbg(dev, "shutdown\n"); | |
1357 | dev->bus->shutdown(dev); | |
1358 | } else if (dev->driver && dev->driver->shutdown) { | |
1359 | dev_dbg(dev, "shutdown\n"); | |
1360 | dev->driver->shutdown(dev); | |
1361 | } | |
1362 | } | |
1363 | } |