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; | |
e105b8bf DW |
30 | static struct kobject *dev_kobj; |
31 | struct kobject *sysfs_dev_char_kobj; | |
32 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 33 | |
4e886c29 GKH |
34 | #ifdef CONFIG_BLOCK |
35 | static inline int device_is_not_partition(struct device *dev) | |
36 | { | |
37 | return !(dev->type == &part_type); | |
38 | } | |
39 | #else | |
40 | static inline int device_is_not_partition(struct device *dev) | |
41 | { | |
42 | return 1; | |
43 | } | |
44 | #endif | |
1da177e4 | 45 | |
3e95637a AS |
46 | /** |
47 | * dev_driver_string - Return a device's driver name, if at all possible | |
48 | * @dev: struct device to get the name of | |
49 | * | |
50 | * Will return the device's driver's name if it is bound to a device. If | |
51 | * the device is not bound to a device, it will return the name of the bus | |
52 | * it is attached to. If it is not attached to a bus either, an empty | |
53 | * string will be returned. | |
54 | */ | |
55 | const char *dev_driver_string(struct device *dev) | |
56 | { | |
57 | return dev->driver ? dev->driver->name : | |
a456b702 JD |
58 | (dev->bus ? dev->bus->name : |
59 | (dev->class ? dev->class->name : "")); | |
3e95637a | 60 | } |
310a922d | 61 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 62 | |
1da177e4 LT |
63 | #define to_dev(obj) container_of(obj, struct device, kobj) |
64 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
65 | ||
4a3ad20c GKH |
66 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
67 | char *buf) | |
1da177e4 | 68 | { |
4a3ad20c GKH |
69 | struct device_attribute *dev_attr = to_dev_attr(attr); |
70 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 71 | ssize_t ret = -EIO; |
1da177e4 LT |
72 | |
73 | if (dev_attr->show) | |
54b6f35c | 74 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
75 | if (ret >= (ssize_t)PAGE_SIZE) { |
76 | print_symbol("dev_attr_show: %s returned bad count\n", | |
77 | (unsigned long)dev_attr->show); | |
78 | } | |
1da177e4 LT |
79 | return ret; |
80 | } | |
81 | ||
4a3ad20c GKH |
82 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
83 | const char *buf, size_t count) | |
1da177e4 | 84 | { |
4a3ad20c GKH |
85 | struct device_attribute *dev_attr = to_dev_attr(attr); |
86 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 87 | ssize_t ret = -EIO; |
1da177e4 LT |
88 | |
89 | if (dev_attr->store) | |
54b6f35c | 90 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
91 | return ret; |
92 | } | |
93 | ||
94 | static struct sysfs_ops dev_sysfs_ops = { | |
95 | .show = dev_attr_show, | |
96 | .store = dev_attr_store, | |
97 | }; | |
98 | ||
99 | ||
100 | /** | |
101 | * device_release - free device structure. | |
102 | * @kobj: device's kobject. | |
103 | * | |
104 | * This is called once the reference count for the object | |
105 | * reaches 0. We forward the call to the device's release | |
106 | * method, which should handle actually freeing the structure. | |
107 | */ | |
4a3ad20c | 108 | static void device_release(struct kobject *kobj) |
1da177e4 | 109 | { |
4a3ad20c | 110 | struct device *dev = to_dev(kobj); |
1da177e4 LT |
111 | |
112 | if (dev->release) | |
113 | dev->release(dev); | |
f9f852df KS |
114 | else if (dev->type && dev->type->release) |
115 | dev->type->release(dev); | |
2620efef GKH |
116 | else if (dev->class && dev->class->dev_release) |
117 | dev->class->dev_release(dev); | |
1da177e4 | 118 | else { |
4a3ad20c GKH |
119 | printk(KERN_ERR "Device '%s' does not have a release() " |
120 | "function, it is broken and must be fixed.\n", | |
1da177e4 LT |
121 | dev->bus_id); |
122 | WARN_ON(1); | |
123 | } | |
124 | } | |
125 | ||
8f4afc41 | 126 | static struct kobj_type device_ktype = { |
1da177e4 LT |
127 | .release = device_release, |
128 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
129 | }; |
130 | ||
131 | ||
312c004d | 132 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
133 | { |
134 | struct kobj_type *ktype = get_ktype(kobj); | |
135 | ||
8f4afc41 | 136 | if (ktype == &device_ktype) { |
1da177e4 | 137 | struct device *dev = to_dev(kobj); |
83b5fb4c CH |
138 | if (dev->uevent_suppress) |
139 | return 0; | |
1da177e4 LT |
140 | if (dev->bus) |
141 | return 1; | |
23681e47 GKH |
142 | if (dev->class) |
143 | return 1; | |
1da177e4 LT |
144 | } |
145 | return 0; | |
146 | } | |
147 | ||
312c004d | 148 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
149 | { |
150 | struct device *dev = to_dev(kobj); | |
151 | ||
23681e47 GKH |
152 | if (dev->bus) |
153 | return dev->bus->name; | |
154 | if (dev->class) | |
155 | return dev->class->name; | |
156 | return NULL; | |
1da177e4 LT |
157 | } |
158 | ||
7eff2e7a KS |
159 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
160 | struct kobj_uevent_env *env) | |
1da177e4 LT |
161 | { |
162 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
163 | int retval = 0; |
164 | ||
23681e47 GKH |
165 | /* add the major/minor if present */ |
166 | if (MAJOR(dev->devt)) { | |
7eff2e7a KS |
167 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
168 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
23681e47 GKH |
169 | } |
170 | ||
414264f9 | 171 | if (dev->type && dev->type->name) |
7eff2e7a | 172 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 173 | |
239378f1 | 174 | if (dev->driver) |
7eff2e7a | 175 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 176 | |
a87cb2ac | 177 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
178 | if (dev->class) { |
179 | struct device *parent = dev->parent; | |
180 | ||
181 | /* find first bus device in parent chain */ | |
182 | while (parent && !parent->bus) | |
183 | parent = parent->parent; | |
184 | if (parent && parent->bus) { | |
185 | const char *path; | |
186 | ||
187 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 188 | if (path) { |
7eff2e7a | 189 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
190 | kfree(path); |
191 | } | |
239378f1 | 192 | |
7eff2e7a | 193 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
194 | |
195 | if (parent->driver) | |
7eff2e7a KS |
196 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
197 | parent->driver->name); | |
239378f1 KS |
198 | } |
199 | } else if (dev->bus) { | |
7eff2e7a | 200 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
201 | |
202 | if (dev->driver) | |
4a3ad20c GKH |
203 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
204 | dev->driver->name); | |
d81d9d6b | 205 | } |
239378f1 | 206 | #endif |
1da177e4 | 207 | |
7eff2e7a | 208 | /* have the bus specific function add its stuff */ |
312c004d | 209 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 210 | retval = dev->bus->uevent(dev, env); |
f9f852df | 211 | if (retval) |
7dc72b28 | 212 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
2b3a302a | 213 | dev->bus_id, __func__, retval); |
1da177e4 LT |
214 | } |
215 | ||
7eff2e7a | 216 | /* have the class specific function add its stuff */ |
2620efef | 217 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 218 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 219 | if (retval) |
7dc72b28 GKH |
220 | pr_debug("device: '%s': %s: class uevent() " |
221 | "returned %d\n", dev->bus_id, | |
2b3a302a | 222 | __func__, retval); |
f9f852df KS |
223 | } |
224 | ||
7eff2e7a | 225 | /* have the device type specific fuction add its stuff */ |
f9f852df | 226 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 227 | retval = dev->type->uevent(dev, env); |
f9f852df | 228 | if (retval) |
7dc72b28 GKH |
229 | pr_debug("device: '%s': %s: dev_type uevent() " |
230 | "returned %d\n", dev->bus_id, | |
2b3a302a | 231 | __func__, retval); |
2620efef GKH |
232 | } |
233 | ||
1da177e4 LT |
234 | return retval; |
235 | } | |
236 | ||
312c004d KS |
237 | static struct kset_uevent_ops device_uevent_ops = { |
238 | .filter = dev_uevent_filter, | |
239 | .name = dev_uevent_name, | |
240 | .uevent = dev_uevent, | |
1da177e4 LT |
241 | }; |
242 | ||
16574dcc KS |
243 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
244 | char *buf) | |
245 | { | |
246 | struct kobject *top_kobj; | |
247 | struct kset *kset; | |
7eff2e7a | 248 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
249 | int i; |
250 | size_t count = 0; | |
251 | int retval; | |
252 | ||
253 | /* search the kset, the device belongs to */ | |
254 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
255 | while (!top_kobj->kset && top_kobj->parent) |
256 | top_kobj = top_kobj->parent; | |
16574dcc KS |
257 | if (!top_kobj->kset) |
258 | goto out; | |
5c5daf65 | 259 | |
16574dcc KS |
260 | kset = top_kobj->kset; |
261 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
262 | goto out; | |
263 | ||
264 | /* respect filter */ | |
265 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
266 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
267 | goto out; | |
268 | ||
7eff2e7a KS |
269 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
270 | if (!env) | |
c7308c81 GKH |
271 | return -ENOMEM; |
272 | ||
16574dcc | 273 | /* let the kset specific function add its keys */ |
7eff2e7a | 274 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
275 | if (retval) |
276 | goto out; | |
277 | ||
278 | /* copy keys to file */ | |
7eff2e7a KS |
279 | for (i = 0; i < env->envp_idx; i++) |
280 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 281 | out: |
7eff2e7a | 282 | kfree(env); |
16574dcc KS |
283 | return count; |
284 | } | |
285 | ||
a7fd6706 KS |
286 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
287 | const char *buf, size_t count) | |
288 | { | |
60a96a59 KS |
289 | enum kobject_action action; |
290 | ||
5c5daf65 | 291 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
292 | kobject_uevent(&dev->kobj, action); |
293 | goto out; | |
294 | } | |
295 | ||
296 | dev_err(dev, "uevent: unsupported action-string; this will " | |
297 | "be ignored in a future kernel version\n"); | |
312c004d | 298 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 299 | out: |
a7fd6706 KS |
300 | return count; |
301 | } | |
302 | ||
ad6a1e1c TH |
303 | static struct device_attribute uevent_attr = |
304 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
305 | ||
621a1672 DT |
306 | static int device_add_attributes(struct device *dev, |
307 | struct device_attribute *attrs) | |
de0ff00d | 308 | { |
621a1672 | 309 | int error = 0; |
de0ff00d | 310 | int i; |
621a1672 DT |
311 | |
312 | if (attrs) { | |
313 | for (i = 0; attr_name(attrs[i]); i++) { | |
314 | error = device_create_file(dev, &attrs[i]); | |
315 | if (error) | |
316 | break; | |
317 | } | |
318 | if (error) | |
319 | while (--i >= 0) | |
320 | device_remove_file(dev, &attrs[i]); | |
321 | } | |
322 | return error; | |
323 | } | |
324 | ||
325 | static void device_remove_attributes(struct device *dev, | |
326 | struct device_attribute *attrs) | |
327 | { | |
328 | int i; | |
329 | ||
330 | if (attrs) | |
331 | for (i = 0; attr_name(attrs[i]); i++) | |
332 | device_remove_file(dev, &attrs[i]); | |
333 | } | |
334 | ||
335 | static int device_add_groups(struct device *dev, | |
336 | struct attribute_group **groups) | |
337 | { | |
de0ff00d | 338 | int error = 0; |
621a1672 | 339 | int i; |
de0ff00d | 340 | |
621a1672 DT |
341 | if (groups) { |
342 | for (i = 0; groups[i]; i++) { | |
343 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
344 | if (error) { |
345 | while (--i >= 0) | |
4a3ad20c GKH |
346 | sysfs_remove_group(&dev->kobj, |
347 | groups[i]); | |
621a1672 | 348 | break; |
de0ff00d GKH |
349 | } |
350 | } | |
351 | } | |
de0ff00d GKH |
352 | return error; |
353 | } | |
354 | ||
621a1672 DT |
355 | static void device_remove_groups(struct device *dev, |
356 | struct attribute_group **groups) | |
de0ff00d GKH |
357 | { |
358 | int i; | |
621a1672 DT |
359 | |
360 | if (groups) | |
361 | for (i = 0; groups[i]; i++) | |
362 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
363 | } |
364 | ||
2620efef GKH |
365 | static int device_add_attrs(struct device *dev) |
366 | { | |
367 | struct class *class = dev->class; | |
f9f852df | 368 | struct device_type *type = dev->type; |
621a1672 | 369 | int error; |
2620efef | 370 | |
621a1672 DT |
371 | if (class) { |
372 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 373 | if (error) |
621a1672 | 374 | return error; |
2620efef | 375 | } |
f9f852df | 376 | |
621a1672 DT |
377 | if (type) { |
378 | error = device_add_groups(dev, type->groups); | |
f9f852df | 379 | if (error) |
621a1672 | 380 | goto err_remove_class_attrs; |
f9f852df KS |
381 | } |
382 | ||
621a1672 DT |
383 | error = device_add_groups(dev, dev->groups); |
384 | if (error) | |
385 | goto err_remove_type_groups; | |
386 | ||
387 | return 0; | |
388 | ||
389 | err_remove_type_groups: | |
390 | if (type) | |
391 | device_remove_groups(dev, type->groups); | |
392 | err_remove_class_attrs: | |
393 | if (class) | |
394 | device_remove_attributes(dev, class->dev_attrs); | |
395 | ||
2620efef GKH |
396 | return error; |
397 | } | |
398 | ||
399 | static void device_remove_attrs(struct device *dev) | |
400 | { | |
401 | struct class *class = dev->class; | |
f9f852df | 402 | struct device_type *type = dev->type; |
2620efef | 403 | |
621a1672 | 404 | device_remove_groups(dev, dev->groups); |
f9f852df | 405 | |
621a1672 DT |
406 | if (type) |
407 | device_remove_groups(dev, type->groups); | |
408 | ||
409 | if (class) | |
410 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
411 | } |
412 | ||
413 | ||
23681e47 GKH |
414 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
415 | char *buf) | |
416 | { | |
417 | return print_dev_t(buf, dev->devt); | |
418 | } | |
419 | ||
ad6a1e1c TH |
420 | static struct device_attribute devt_attr = |
421 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
422 | ||
881c6cfd GKH |
423 | /* kset to create /sys/devices/ */ |
424 | struct kset *devices_kset; | |
1da177e4 | 425 | |
1da177e4 | 426 | /** |
4a3ad20c GKH |
427 | * device_create_file - create sysfs attribute file for device. |
428 | * @dev: device. | |
429 | * @attr: device attribute descriptor. | |
1da177e4 | 430 | */ |
4a3ad20c | 431 | int device_create_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
432 | { |
433 | int error = 0; | |
0c98b19f | 434 | if (dev) |
1da177e4 | 435 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
436 | return error; |
437 | } | |
438 | ||
439 | /** | |
4a3ad20c GKH |
440 | * device_remove_file - remove sysfs attribute file. |
441 | * @dev: device. | |
442 | * @attr: device attribute descriptor. | |
1da177e4 | 443 | */ |
4a3ad20c | 444 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
1da177e4 | 445 | { |
0c98b19f | 446 | if (dev) |
1da177e4 | 447 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
448 | } |
449 | ||
2589f188 GKH |
450 | /** |
451 | * device_create_bin_file - create sysfs binary attribute file for device. | |
452 | * @dev: device. | |
453 | * @attr: device binary attribute descriptor. | |
454 | */ | |
455 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
456 | { | |
457 | int error = -EINVAL; | |
458 | if (dev) | |
459 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
460 | return error; | |
461 | } | |
462 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
463 | ||
464 | /** | |
465 | * device_remove_bin_file - remove sysfs binary attribute file | |
466 | * @dev: device. | |
467 | * @attr: device binary attribute descriptor. | |
468 | */ | |
469 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
470 | { | |
471 | if (dev) | |
472 | sysfs_remove_bin_file(&dev->kobj, attr); | |
473 | } | |
474 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
475 | ||
d9a9cdfb | 476 | /** |
523ded71 | 477 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
478 | * @dev: device. |
479 | * @func: callback function to invoke later. | |
523ded71 | 480 | * @owner: module owning the callback routine |
d9a9cdfb AS |
481 | * |
482 | * Attribute methods must not unregister themselves or their parent device | |
483 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
484 | * since unregistration is mutually exclusive with driver callbacks. | |
485 | * | |
486 | * Instead methods can call this routine, which will attempt to allocate | |
487 | * and schedule a workqueue request to call back @func with @dev as its | |
488 | * argument in the workqueue's process context. @dev will be pinned until | |
489 | * @func returns. | |
490 | * | |
523ded71 AS |
491 | * This routine is usually called via the inline device_schedule_callback(), |
492 | * which automatically sets @owner to THIS_MODULE. | |
493 | * | |
d9a9cdfb | 494 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 495 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
496 | * |
497 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
498 | * underlying sysfs routine (since it is intended for use by attribute | |
499 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
500 | */ | |
523ded71 AS |
501 | int device_schedule_callback_owner(struct device *dev, |
502 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
503 | { |
504 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 505 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 506 | } |
523ded71 | 507 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 508 | |
34bb61f9 JB |
509 | static void klist_children_get(struct klist_node *n) |
510 | { | |
511 | struct device *dev = container_of(n, struct device, knode_parent); | |
512 | ||
513 | get_device(dev); | |
514 | } | |
515 | ||
516 | static void klist_children_put(struct klist_node *n) | |
517 | { | |
518 | struct device *dev = container_of(n, struct device, knode_parent); | |
519 | ||
520 | put_device(dev); | |
521 | } | |
522 | ||
1da177e4 | 523 | /** |
4a3ad20c GKH |
524 | * device_initialize - init device structure. |
525 | * @dev: device. | |
1da177e4 | 526 | * |
4a3ad20c GKH |
527 | * This prepares the device for use by other layers, |
528 | * including adding it to the device hierarchy. | |
529 | * It is the first half of device_register(), if called by | |
530 | * that, though it can also be called separately, so one | |
531 | * may use @dev's fields (e.g. the refcount). | |
1da177e4 | 532 | */ |
1da177e4 LT |
533 | void device_initialize(struct device *dev) |
534 | { | |
881c6cfd | 535 | dev->kobj.kset = devices_kset; |
f9cb074b | 536 | kobject_init(&dev->kobj, &device_ktype); |
34bb61f9 JB |
537 | klist_init(&dev->klist_children, klist_children_get, |
538 | klist_children_put); | |
1da177e4 | 539 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 540 | INIT_LIST_HEAD(&dev->node); |
af70316a | 541 | init_MUTEX(&dev->sem); |
9ac7849e TH |
542 | spin_lock_init(&dev->devres_lock); |
543 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 544 | device_init_wakeup(dev, 0); |
87348136 | 545 | set_dev_node(dev, -1); |
1da177e4 LT |
546 | } |
547 | ||
40fa5422 | 548 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
549 | static struct kobject *get_device_parent(struct device *dev, |
550 | struct device *parent) | |
40fa5422 | 551 | { |
da231fd5 | 552 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 553 | if (dev->class && (!parent || parent->class != dev->class)) |
7c71448b | 554 | return &dev->class->p->subsys.kobj; |
da231fd5 | 555 | /* all other devices keep their parent */ |
40fa5422 | 556 | else if (parent) |
c744aeae | 557 | return &parent->kobj; |
40fa5422 | 558 | |
c744aeae | 559 | return NULL; |
40fa5422 | 560 | } |
da231fd5 KS |
561 | |
562 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
563 | static inline void cleanup_glue_dir(struct device *dev, |
564 | struct kobject *glue_dir) {} | |
40fa5422 | 565 | #else |
86406245 | 566 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 567 | { |
86406245 | 568 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 569 | |
86406245 | 570 | if (!virtual_dir) |
4ff6abff | 571 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 572 | &devices_kset->kobj); |
f0ee61a6 | 573 | |
86406245 | 574 | return virtual_dir; |
f0ee61a6 GKH |
575 | } |
576 | ||
da231fd5 KS |
577 | static struct kobject *get_device_parent(struct device *dev, |
578 | struct device *parent) | |
40fa5422 | 579 | { |
43968d2f GKH |
580 | int retval; |
581 | ||
86406245 KS |
582 | if (dev->class) { |
583 | struct kobject *kobj = NULL; | |
584 | struct kobject *parent_kobj; | |
585 | struct kobject *k; | |
586 | ||
587 | /* | |
588 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
589 | * Class-devices with a non class-device as parent, live |
590 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
591 | */ |
592 | if (parent == NULL) | |
593 | parent_kobj = virtual_device_parent(dev); | |
594 | else if (parent->class) | |
595 | return &parent->kobj; | |
596 | else | |
597 | parent_kobj = &parent->kobj; | |
598 | ||
599 | /* find our class-directory at the parent and reference it */ | |
7c71448b GKH |
600 | spin_lock(&dev->class->p->class_dirs.list_lock); |
601 | list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) | |
86406245 KS |
602 | if (k->parent == parent_kobj) { |
603 | kobj = kobject_get(k); | |
604 | break; | |
605 | } | |
7c71448b | 606 | spin_unlock(&dev->class->p->class_dirs.list_lock); |
86406245 KS |
607 | if (kobj) |
608 | return kobj; | |
609 | ||
610 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
611 | k = kobject_create(); |
612 | if (!k) | |
613 | return NULL; | |
7c71448b | 614 | k->kset = &dev->class->p->class_dirs; |
b2d6db58 | 615 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f GKH |
616 | if (retval < 0) { |
617 | kobject_put(k); | |
618 | return NULL; | |
619 | } | |
0f4dafc0 | 620 | /* do not emit an uevent for this simple "glue" directory */ |
43968d2f | 621 | return k; |
86406245 KS |
622 | } |
623 | ||
624 | if (parent) | |
c744aeae CH |
625 | return &parent->kobj; |
626 | return NULL; | |
627 | } | |
da231fd5 | 628 | |
63b6971a | 629 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 630 | { |
0f4dafc0 | 631 | /* see if we live in a "glue" directory */ |
c1fe539a | 632 | if (!glue_dir || !dev->class || |
7c71448b | 633 | glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5 KS |
634 | return; |
635 | ||
0f4dafc0 | 636 | kobject_put(glue_dir); |
da231fd5 | 637 | } |
63b6971a CH |
638 | |
639 | static void cleanup_device_parent(struct device *dev) | |
640 | { | |
641 | cleanup_glue_dir(dev, dev->kobj.parent); | |
642 | } | |
c744aeae | 643 | #endif |
86406245 | 644 | |
63b6971a | 645 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
646 | { |
647 | struct kobject *kobj; | |
648 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
649 | if (kobj) |
650 | dev->kobj.parent = kobj; | |
40fa5422 | 651 | } |
40fa5422 | 652 | |
2ee97caf CH |
653 | static int device_add_class_symlinks(struct device *dev) |
654 | { | |
655 | int error; | |
656 | ||
657 | if (!dev->class) | |
658 | return 0; | |
da231fd5 | 659 | |
7c71448b | 660 | error = sysfs_create_link(&dev->kobj, &dev->class->p->subsys.kobj, |
2ee97caf CH |
661 | "subsystem"); |
662 | if (error) | |
663 | goto out; | |
da231fd5 KS |
664 | |
665 | #ifdef CONFIG_SYSFS_DEPRECATED | |
666 | /* stacked class devices need a symlink in the class directory */ | |
7c71448b | 667 | if (dev->kobj.parent != &dev->class->p->subsys.kobj && |
4e886c29 | 668 | device_is_not_partition(dev)) { |
7c71448b GKH |
669 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
670 | &dev->kobj, dev->bus_id); | |
2ee97caf CH |
671 | if (error) |
672 | goto out_subsys; | |
673 | } | |
da231fd5 | 674 | |
4e886c29 | 675 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
676 | struct device *parent = dev->parent; |
677 | char *class_name; | |
4f01a757 | 678 | |
da231fd5 KS |
679 | /* |
680 | * stacked class devices have the 'device' link | |
681 | * pointing to the bus device instead of the parent | |
682 | */ | |
683 | while (parent->class && !parent->bus && parent->parent) | |
684 | parent = parent->parent; | |
685 | ||
686 | error = sysfs_create_link(&dev->kobj, | |
687 | &parent->kobj, | |
4f01a757 DT |
688 | "device"); |
689 | if (error) | |
690 | goto out_busid; | |
da231fd5 KS |
691 | |
692 | class_name = make_class_name(dev->class->name, | |
693 | &dev->kobj); | |
694 | if (class_name) | |
695 | error = sysfs_create_link(&dev->parent->kobj, | |
696 | &dev->kobj, class_name); | |
697 | kfree(class_name); | |
698 | if (error) | |
699 | goto out_device; | |
2ee97caf CH |
700 | } |
701 | return 0; | |
702 | ||
2ee97caf | 703 | out_device: |
4e886c29 | 704 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 705 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 706 | out_busid: |
7c71448b | 707 | if (dev->kobj.parent != &dev->class->p->subsys.kobj && |
4e886c29 | 708 | device_is_not_partition(dev)) |
7c71448b | 709 | sysfs_remove_link(&dev->class->p->subsys.kobj, dev->bus_id); |
da231fd5 KS |
710 | #else |
711 | /* link in the class directory pointing to the device */ | |
7c71448b | 712 | error = sysfs_create_link(&dev->class->p->subsys.kobj, &dev->kobj, |
da231fd5 KS |
713 | dev->bus_id); |
714 | if (error) | |
715 | goto out_subsys; | |
716 | ||
4e886c29 | 717 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
718 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
719 | "device"); | |
720 | if (error) | |
721 | goto out_busid; | |
722 | } | |
723 | return 0; | |
724 | ||
725 | out_busid: | |
7c71448b | 726 | sysfs_remove_link(&dev->class->p->subsys.kobj, dev->bus_id); |
da231fd5 KS |
727 | #endif |
728 | ||
2ee97caf CH |
729 | out_subsys: |
730 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
731 | out: | |
732 | return error; | |
733 | } | |
734 | ||
735 | static void device_remove_class_symlinks(struct device *dev) | |
736 | { | |
737 | if (!dev->class) | |
738 | return; | |
da231fd5 | 739 | |
2ee97caf | 740 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 741 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
742 | char *class_name; |
743 | ||
744 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
745 | if (class_name) { | |
746 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
747 | kfree(class_name); | |
748 | } | |
2ee97caf CH |
749 | sysfs_remove_link(&dev->kobj, "device"); |
750 | } | |
da231fd5 | 751 | |
7c71448b | 752 | if (dev->kobj.parent != &dev->class->p->subsys.kobj && |
4e886c29 | 753 | device_is_not_partition(dev)) |
7c71448b | 754 | sysfs_remove_link(&dev->class->p->subsys.kobj, dev->bus_id); |
da231fd5 | 755 | #else |
4e886c29 | 756 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
757 | sysfs_remove_link(&dev->kobj, "device"); |
758 | ||
7c71448b | 759 | sysfs_remove_link(&dev->class->p->subsys.kobj, dev->bus_id); |
da231fd5 KS |
760 | #endif |
761 | ||
2ee97caf CH |
762 | sysfs_remove_link(&dev->kobj, "subsystem"); |
763 | } | |
764 | ||
413c239f SR |
765 | /** |
766 | * dev_set_name - set a device name | |
767 | * @dev: device | |
46232366 | 768 | * @fmt: format string for the device's name |
413c239f SR |
769 | */ |
770 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
771 | { | |
772 | va_list vargs; | |
773 | ||
774 | va_start(vargs, fmt); | |
775 | vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs); | |
776 | va_end(vargs); | |
777 | return 0; | |
778 | } | |
779 | EXPORT_SYMBOL_GPL(dev_set_name); | |
780 | ||
e105b8bf DW |
781 | /** |
782 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
783 | * @dev: device | |
784 | * | |
785 | * By default we select char/ for new entries. Setting class->dev_obj | |
786 | * to NULL prevents an entry from being created. class->dev_kobj must | |
787 | * be set (or cleared) before any devices are registered to the class | |
788 | * otherwise device_create_sys_dev_entry() and | |
789 | * device_remove_sys_dev_entry() will disagree about the the presence | |
790 | * of the link. | |
791 | */ | |
792 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
793 | { | |
794 | struct kobject *kobj; | |
795 | ||
796 | if (dev->class) | |
797 | kobj = dev->class->dev_kobj; | |
798 | else | |
799 | kobj = sysfs_dev_char_kobj; | |
800 | ||
801 | return kobj; | |
802 | } | |
803 | ||
804 | static int device_create_sys_dev_entry(struct device *dev) | |
805 | { | |
806 | struct kobject *kobj = device_to_dev_kobj(dev); | |
807 | int error = 0; | |
808 | char devt_str[15]; | |
809 | ||
810 | if (kobj) { | |
811 | format_dev_t(devt_str, dev->devt); | |
812 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
813 | } | |
814 | ||
815 | return error; | |
816 | } | |
817 | ||
818 | static void device_remove_sys_dev_entry(struct device *dev) | |
819 | { | |
820 | struct kobject *kobj = device_to_dev_kobj(dev); | |
821 | char devt_str[15]; | |
822 | ||
823 | if (kobj) { | |
824 | format_dev_t(devt_str, dev->devt); | |
825 | sysfs_remove_link(kobj, devt_str); | |
826 | } | |
827 | } | |
828 | ||
1da177e4 | 829 | /** |
4a3ad20c GKH |
830 | * device_add - add device to device hierarchy. |
831 | * @dev: device. | |
1da177e4 | 832 | * |
4a3ad20c GKH |
833 | * This is part 2 of device_register(), though may be called |
834 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 835 | * |
4a3ad20c GKH |
836 | * This adds it to the kobject hierarchy via kobject_add(), adds it |
837 | * to the global and sibling lists for the device, then | |
838 | * adds it to the other relevant subsystems of the driver model. | |
1da177e4 LT |
839 | */ |
840 | int device_add(struct device *dev) | |
841 | { | |
842 | struct device *parent = NULL; | |
c47ed219 | 843 | struct class_interface *class_intf; |
775b64d2 RW |
844 | int error; |
845 | ||
1da177e4 | 846 | dev = get_device(dev); |
775b64d2 RW |
847 | if (!dev || !strlen(dev->bus_id)) { |
848 | error = -EINVAL; | |
c1fe539a | 849 | goto Done; |
775b64d2 | 850 | } |
1da177e4 | 851 | |
2b3a302a | 852 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
c205ef48 | 853 | |
1da177e4 | 854 | parent = get_device(dev->parent); |
63b6971a | 855 | setup_parent(dev, parent); |
1da177e4 | 856 | |
0d358f22 YL |
857 | /* use parent numa_node */ |
858 | if (parent) | |
859 | set_dev_node(dev, dev_to_node(parent)); | |
860 | ||
1da177e4 | 861 | /* first, register with generic layer. */ |
b2d6db58 | 862 | error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
40fa5422 | 863 | if (error) |
1da177e4 | 864 | goto Error; |
a7fd6706 | 865 | |
37022644 BW |
866 | /* notify platform of device entry */ |
867 | if (platform_notify) | |
868 | platform_notify(dev); | |
869 | ||
116af378 BH |
870 | /* notify clients of device entry (new way) */ |
871 | if (dev->bus) | |
c6f7e72a | 872 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
873 | BUS_NOTIFY_ADD_DEVICE, dev); |
874 | ||
ad6a1e1c | 875 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
876 | if (error) |
877 | goto attrError; | |
a7fd6706 | 878 | |
23681e47 | 879 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
880 | error = device_create_file(dev, &devt_attr); |
881 | if (error) | |
a306eea4 | 882 | goto ueventattrError; |
e105b8bf DW |
883 | |
884 | error = device_create_sys_dev_entry(dev); | |
885 | if (error) | |
886 | goto devtattrError; | |
23681e47 GKH |
887 | } |
888 | ||
2ee97caf CH |
889 | error = device_add_class_symlinks(dev); |
890 | if (error) | |
891 | goto SymlinkError; | |
dc0afa83 CH |
892 | error = device_add_attrs(dev); |
893 | if (error) | |
2620efef | 894 | goto AttrsError; |
dc0afa83 CH |
895 | error = bus_add_device(dev); |
896 | if (error) | |
1da177e4 | 897 | goto BusError; |
57eee3d2 RW |
898 | error = device_pm_add(dev); |
899 | if (error) | |
900 | goto PMError; | |
83b5fb4c | 901 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 902 | bus_attach_device(dev); |
1da177e4 | 903 | if (parent) |
d856f1e3 | 904 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 905 | |
5d9fd169 | 906 | if (dev->class) { |
7c71448b | 907 | down(&dev->class->p->sem); |
c47ed219 | 908 | /* tie the class to the device */ |
97ae69fd | 909 | list_add_tail(&dev->node, &dev->class->p->class_devices); |
c47ed219 GKH |
910 | |
911 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
912 | list_for_each_entry(class_intf, |
913 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
914 | if (class_intf->add_dev) |
915 | class_intf->add_dev(dev, class_intf); | |
7c71448b | 916 | up(&dev->class->p->sem); |
5d9fd169 | 917 | } |
1da177e4 LT |
918 | Done: |
919 | put_device(dev); | |
920 | return error; | |
1da177e4 | 921 | PMError: |
57eee3d2 RW |
922 | bus_remove_device(dev); |
923 | BusError: | |
116af378 | 924 | if (dev->bus) |
c6f7e72a | 925 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 926 | BUS_NOTIFY_DEL_DEVICE, dev); |
82f0cf9b | 927 | device_remove_attrs(dev); |
2620efef | 928 | AttrsError: |
2ee97caf CH |
929 | device_remove_class_symlinks(dev); |
930 | SymlinkError: | |
e105b8bf DW |
931 | if (MAJOR(dev->devt)) |
932 | device_remove_sys_dev_entry(dev); | |
933 | devtattrError: | |
ad6a1e1c TH |
934 | if (MAJOR(dev->devt)) |
935 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 936 | ueventattrError: |
ad6a1e1c | 937 | device_remove_file(dev, &uevent_attr); |
23681e47 | 938 | attrError: |
312c004d | 939 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
940 | kobject_del(&dev->kobj); |
941 | Error: | |
63b6971a | 942 | cleanup_device_parent(dev); |
1da177e4 LT |
943 | if (parent) |
944 | put_device(parent); | |
945 | goto Done; | |
946 | } | |
947 | ||
1da177e4 | 948 | /** |
4a3ad20c GKH |
949 | * device_register - register a device with the system. |
950 | * @dev: pointer to the device structure | |
1da177e4 | 951 | * |
4a3ad20c GKH |
952 | * This happens in two clean steps - initialize the device |
953 | * and add it to the system. The two steps can be called | |
954 | * separately, but this is the easiest and most common. | |
955 | * I.e. you should only call the two helpers separately if | |
956 | * have a clearly defined need to use and refcount the device | |
957 | * before it is added to the hierarchy. | |
1da177e4 | 958 | */ |
1da177e4 LT |
959 | int device_register(struct device *dev) |
960 | { | |
961 | device_initialize(dev); | |
962 | return device_add(dev); | |
963 | } | |
964 | ||
1da177e4 | 965 | /** |
4a3ad20c GKH |
966 | * get_device - increment reference count for device. |
967 | * @dev: device. | |
1da177e4 | 968 | * |
4a3ad20c GKH |
969 | * This simply forwards the call to kobject_get(), though |
970 | * we do take care to provide for the case that we get a NULL | |
971 | * pointer passed in. | |
1da177e4 | 972 | */ |
4a3ad20c | 973 | struct device *get_device(struct device *dev) |
1da177e4 LT |
974 | { |
975 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
976 | } | |
977 | ||
1da177e4 | 978 | /** |
4a3ad20c GKH |
979 | * put_device - decrement reference count. |
980 | * @dev: device in question. | |
1da177e4 | 981 | */ |
4a3ad20c | 982 | void put_device(struct device *dev) |
1da177e4 | 983 | { |
edfaa7c3 | 984 | /* might_sleep(); */ |
1da177e4 LT |
985 | if (dev) |
986 | kobject_put(&dev->kobj); | |
987 | } | |
988 | ||
1da177e4 | 989 | /** |
4a3ad20c GKH |
990 | * device_del - delete device from system. |
991 | * @dev: device. | |
1da177e4 | 992 | * |
4a3ad20c GKH |
993 | * This is the first part of the device unregistration |
994 | * sequence. This removes the device from the lists we control | |
995 | * from here, has it removed from the other driver model | |
996 | * subsystems it was added to in device_add(), and removes it | |
997 | * from the kobject hierarchy. | |
1da177e4 | 998 | * |
4a3ad20c GKH |
999 | * NOTE: this should be called manually _iff_ device_add() was |
1000 | * also called manually. | |
1da177e4 | 1001 | */ |
4a3ad20c | 1002 | void device_del(struct device *dev) |
1da177e4 | 1003 | { |
4a3ad20c | 1004 | struct device *parent = dev->parent; |
c47ed219 | 1005 | struct class_interface *class_intf; |
1da177e4 | 1006 | |
775b64d2 | 1007 | device_pm_remove(dev); |
1da177e4 | 1008 | if (parent) |
d62c0f9f | 1009 | klist_del(&dev->knode_parent); |
e105b8bf DW |
1010 | if (MAJOR(dev->devt)) { |
1011 | device_remove_sys_dev_entry(dev); | |
ad6a1e1c | 1012 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1013 | } |
b9d9c82b | 1014 | if (dev->class) { |
da231fd5 | 1015 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1016 | |
7c71448b | 1017 | down(&dev->class->p->sem); |
c47ed219 | 1018 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1019 | list_for_each_entry(class_intf, |
1020 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1021 | if (class_intf->remove_dev) |
1022 | class_intf->remove_dev(dev, class_intf); | |
1023 | /* remove the device from the class list */ | |
5d9fd169 | 1024 | list_del_init(&dev->node); |
7c71448b | 1025 | up(&dev->class->p->sem); |
b9d9c82b | 1026 | } |
ad6a1e1c | 1027 | device_remove_file(dev, &uevent_attr); |
2620efef | 1028 | device_remove_attrs(dev); |
28953533 | 1029 | bus_remove_device(dev); |
1da177e4 | 1030 | |
2f8d16a9 TH |
1031 | /* |
1032 | * Some platform devices are driven without driver attached | |
1033 | * and managed resources may have been acquired. Make sure | |
1034 | * all resources are released. | |
1035 | */ | |
1036 | devres_release_all(dev); | |
1037 | ||
1da177e4 LT |
1038 | /* Notify the platform of the removal, in case they |
1039 | * need to do anything... | |
1040 | */ | |
1041 | if (platform_notify_remove) | |
1042 | platform_notify_remove(dev); | |
116af378 | 1043 | if (dev->bus) |
c6f7e72a | 1044 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 1045 | BUS_NOTIFY_DEL_DEVICE, dev); |
312c004d | 1046 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1047 | cleanup_device_parent(dev); |
1da177e4 | 1048 | kobject_del(&dev->kobj); |
da231fd5 | 1049 | put_device(parent); |
1da177e4 LT |
1050 | } |
1051 | ||
1052 | /** | |
4a3ad20c GKH |
1053 | * device_unregister - unregister device from system. |
1054 | * @dev: device going away. | |
1da177e4 | 1055 | * |
4a3ad20c GKH |
1056 | * We do this in two parts, like we do device_register(). First, |
1057 | * we remove it from all the subsystems with device_del(), then | |
1058 | * we decrement the reference count via put_device(). If that | |
1059 | * is the final reference count, the device will be cleaned up | |
1060 | * via device_release() above. Otherwise, the structure will | |
1061 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1062 | */ |
4a3ad20c | 1063 | void device_unregister(struct device *dev) |
1da177e4 | 1064 | { |
2b3a302a | 1065 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
1da177e4 LT |
1066 | device_del(dev); |
1067 | put_device(dev); | |
1068 | } | |
1069 | ||
4a3ad20c | 1070 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1071 | { |
4a3ad20c | 1072 | struct klist_node *n = klist_next(i); |
36239577 | 1073 | return n ? container_of(n, struct device, knode_parent) : NULL; |
1074 | } | |
1075 | ||
1da177e4 | 1076 | /** |
4a3ad20c GKH |
1077 | * device_for_each_child - device child iterator. |
1078 | * @parent: parent struct device. | |
1079 | * @data: data for the callback. | |
1080 | * @fn: function to be called for each device. | |
1da177e4 | 1081 | * |
4a3ad20c GKH |
1082 | * Iterate over @parent's child devices, and call @fn for each, |
1083 | * passing it @data. | |
1da177e4 | 1084 | * |
4a3ad20c GKH |
1085 | * We check the return of @fn each time. If it returns anything |
1086 | * other than 0, we break out and return that value. | |
1da177e4 | 1087 | */ |
4a3ad20c GKH |
1088 | int device_for_each_child(struct device *parent, void *data, |
1089 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1090 | { |
36239577 | 1091 | struct klist_iter i; |
4a3ad20c | 1092 | struct device *child; |
1da177e4 LT |
1093 | int error = 0; |
1094 | ||
36239577 | 1095 | klist_iter_init(&parent->klist_children, &i); |
1096 | while ((child = next_device(&i)) && !error) | |
1097 | error = fn(child, data); | |
1098 | klist_iter_exit(&i); | |
1da177e4 LT |
1099 | return error; |
1100 | } | |
1101 | ||
5ab69981 CH |
1102 | /** |
1103 | * device_find_child - device iterator for locating a particular device. | |
1104 | * @parent: parent struct device | |
1105 | * @data: Data to pass to match function | |
1106 | * @match: Callback function to check device | |
1107 | * | |
1108 | * This is similar to the device_for_each_child() function above, but it | |
1109 | * returns a reference to a device that is 'found' for later use, as | |
1110 | * determined by the @match callback. | |
1111 | * | |
1112 | * The callback should return 0 if the device doesn't match and non-zero | |
1113 | * if it does. If the callback returns non-zero and a reference to the | |
1114 | * current device can be obtained, this function will return to the caller | |
1115 | * and not iterate over any more devices. | |
1116 | */ | |
4a3ad20c GKH |
1117 | struct device *device_find_child(struct device *parent, void *data, |
1118 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1119 | { |
1120 | struct klist_iter i; | |
1121 | struct device *child; | |
1122 | ||
1123 | if (!parent) | |
1124 | return NULL; | |
1125 | ||
1126 | klist_iter_init(&parent->klist_children, &i); | |
1127 | while ((child = next_device(&i))) | |
1128 | if (match(child, data) && get_device(child)) | |
1129 | break; | |
1130 | klist_iter_exit(&i); | |
1131 | return child; | |
1132 | } | |
1133 | ||
1da177e4 LT |
1134 | int __init devices_init(void) |
1135 | { | |
881c6cfd GKH |
1136 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1137 | if (!devices_kset) | |
1138 | return -ENOMEM; | |
e105b8bf DW |
1139 | dev_kobj = kobject_create_and_add("dev", NULL); |
1140 | if (!dev_kobj) | |
1141 | goto dev_kobj_err; | |
1142 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1143 | if (!sysfs_dev_block_kobj) | |
1144 | goto block_kobj_err; | |
1145 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1146 | if (!sysfs_dev_char_kobj) | |
1147 | goto char_kobj_err; | |
1148 | ||
881c6cfd | 1149 | return 0; |
e105b8bf DW |
1150 | |
1151 | char_kobj_err: | |
1152 | kobject_put(sysfs_dev_block_kobj); | |
1153 | block_kobj_err: | |
1154 | kobject_put(dev_kobj); | |
1155 | dev_kobj_err: | |
1156 | kset_unregister(devices_kset); | |
1157 | return -ENOMEM; | |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1161 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1162 | |
1163 | EXPORT_SYMBOL_GPL(device_initialize); | |
1164 | EXPORT_SYMBOL_GPL(device_add); | |
1165 | EXPORT_SYMBOL_GPL(device_register); | |
1166 | ||
1167 | EXPORT_SYMBOL_GPL(device_del); | |
1168 | EXPORT_SYMBOL_GPL(device_unregister); | |
1169 | EXPORT_SYMBOL_GPL(get_device); | |
1170 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1171 | |
1172 | EXPORT_SYMBOL_GPL(device_create_file); | |
1173 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1174 | |
1175 | ||
1176 | static void device_create_release(struct device *dev) | |
1177 | { | |
2b3a302a | 1178 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
23681e47 GKH |
1179 | kfree(dev); |
1180 | } | |
1181 | ||
1182 | /** | |
8882b394 | 1183 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1184 | * @class: pointer to the struct class that this device should be registered to |
1185 | * @parent: pointer to the parent struct device of this new device, if any | |
1186 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1187 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1188 | * @fmt: string for the device's name |
8882b394 | 1189 | * @args: va_list for the device's name |
42734daf HK |
1190 | * |
1191 | * This function can be used by char device classes. A struct device | |
1192 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1193 | * |
23681e47 GKH |
1194 | * A "dev" file will be created, showing the dev_t for the device, if |
1195 | * the dev_t is not 0,0. | |
42734daf HK |
1196 | * If a pointer to a parent struct device is passed in, the newly created |
1197 | * struct device will be a child of that device in sysfs. | |
1198 | * The pointer to the struct device will be returned from the call. | |
1199 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1200 | * pointer. |
1201 | * | |
1202 | * Note: the struct class passed to this function must have previously | |
1203 | * been created with a call to class_create(). | |
1204 | */ | |
8882b394 GKH |
1205 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1206 | dev_t devt, void *drvdata, const char *fmt, | |
1207 | va_list args) | |
23681e47 | 1208 | { |
23681e47 GKH |
1209 | struct device *dev = NULL; |
1210 | int retval = -ENODEV; | |
1211 | ||
1212 | if (class == NULL || IS_ERR(class)) | |
1213 | goto error; | |
23681e47 GKH |
1214 | |
1215 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1216 | if (!dev) { | |
1217 | retval = -ENOMEM; | |
1218 | goto error; | |
1219 | } | |
1220 | ||
1221 | dev->devt = devt; | |
1222 | dev->class = class; | |
1223 | dev->parent = parent; | |
1224 | dev->release = device_create_release; | |
8882b394 | 1225 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1226 | |
23681e47 | 1227 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); |
23681e47 GKH |
1228 | retval = device_register(dev); |
1229 | if (retval) | |
1230 | goto error; | |
1231 | ||
23681e47 GKH |
1232 | return dev; |
1233 | ||
1234 | error: | |
1235 | kfree(dev); | |
1236 | return ERR_PTR(retval); | |
1237 | } | |
8882b394 GKH |
1238 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1239 | ||
1240 | /** | |
4e106739 | 1241 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1242 | * @class: pointer to the struct class that this device should be registered to |
1243 | * @parent: pointer to the parent struct device of this new device, if any | |
1244 | * @devt: the dev_t for the char device to be added | |
1245 | * @drvdata: the data to be added to the device for callbacks | |
1246 | * @fmt: string for the device's name | |
1247 | * | |
1248 | * This function can be used by char device classes. A struct device | |
1249 | * will be created in sysfs, registered to the specified class. | |
1250 | * | |
1251 | * A "dev" file will be created, showing the dev_t for the device, if | |
1252 | * the dev_t is not 0,0. | |
1253 | * If a pointer to a parent struct device is passed in, the newly created | |
1254 | * struct device will be a child of that device in sysfs. | |
1255 | * The pointer to the struct device will be returned from the call. | |
1256 | * Any further sysfs files that might be required can be created using this | |
1257 | * pointer. | |
1258 | * | |
1259 | * Note: the struct class passed to this function must have previously | |
1260 | * been created with a call to class_create(). | |
1261 | */ | |
4e106739 GKH |
1262 | struct device *device_create(struct class *class, struct device *parent, |
1263 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1264 | { |
1265 | va_list vargs; | |
1266 | struct device *dev; | |
1267 | ||
1268 | va_start(vargs, fmt); | |
1269 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1270 | va_end(vargs); | |
1271 | return dev; | |
1272 | } | |
4e106739 | 1273 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1274 | |
cd35449b | 1275 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1276 | { |
cd35449b | 1277 | dev_t *devt = data; |
23681e47 | 1278 | |
cd35449b | 1279 | return dev->devt == *devt; |
775b64d2 RW |
1280 | } |
1281 | ||
1282 | /** | |
1283 | * device_destroy - removes a device that was created with device_create() | |
1284 | * @class: pointer to the struct class that this device was registered with | |
1285 | * @devt: the dev_t of the device that was previously registered | |
1286 | * | |
1287 | * This call unregisters and cleans up a device that was created with a | |
1288 | * call to device_create(). | |
1289 | */ | |
1290 | void device_destroy(struct class *class, dev_t devt) | |
1291 | { | |
1292 | struct device *dev; | |
23681e47 | 1293 | |
695794ae | 1294 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1295 | if (dev) { |
1296 | put_device(dev); | |
23681e47 | 1297 | device_unregister(dev); |
cd35449b | 1298 | } |
23681e47 GKH |
1299 | } |
1300 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1301 | |
1302 | /** | |
1303 | * device_rename - renames a device | |
1304 | * @dev: the pointer to the struct device to be renamed | |
1305 | * @new_name: the new name of the device | |
1306 | */ | |
1307 | int device_rename(struct device *dev, char *new_name) | |
1308 | { | |
1309 | char *old_class_name = NULL; | |
1310 | char *new_class_name = NULL; | |
2ee97caf | 1311 | char *old_device_name = NULL; |
a2de48ca GKH |
1312 | int error; |
1313 | ||
1314 | dev = get_device(dev); | |
1315 | if (!dev) | |
1316 | return -EINVAL; | |
1317 | ||
7dc72b28 | 1318 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
2b3a302a | 1319 | __func__, new_name); |
a2de48ca | 1320 | |
99ef3ef8 | 1321 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1322 | if ((dev->class) && (dev->parent)) |
1323 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1324 | #endif |
a2de48ca | 1325 | |
2ee97caf CH |
1326 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1327 | if (!old_device_name) { | |
1328 | error = -ENOMEM; | |
1329 | goto out; | |
a2de48ca | 1330 | } |
2ee97caf | 1331 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1332 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1333 | ||
1334 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1335 | if (error) { |
1336 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1337 | goto out; | |
1338 | } | |
a2de48ca | 1339 | |
99ef3ef8 | 1340 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1341 | if (old_class_name) { |
1342 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1343 | if (new_class_name) { | |
2ee97caf CH |
1344 | error = sysfs_create_link(&dev->parent->kobj, |
1345 | &dev->kobj, new_class_name); | |
1346 | if (error) | |
1347 | goto out; | |
a2de48ca GKH |
1348 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1349 | } | |
1350 | } | |
60b8cabd | 1351 | #else |
a2de48ca | 1352 | if (dev->class) { |
7c71448b GKH |
1353 | error = sysfs_create_link(&dev->class->p->subsys.kobj, |
1354 | &dev->kobj, dev->bus_id); | |
0599ad53 SH |
1355 | if (error) |
1356 | goto out; | |
7c71448b GKH |
1357 | sysfs_remove_link(&dev->class->p->subsys.kobj, |
1358 | old_device_name); | |
a2de48ca | 1359 | } |
60b8cabd KS |
1360 | #endif |
1361 | ||
2ee97caf | 1362 | out: |
a2de48ca GKH |
1363 | put_device(dev); |
1364 | ||
a2de48ca | 1365 | kfree(new_class_name); |
952ab431 | 1366 | kfree(old_class_name); |
2ee97caf | 1367 | kfree(old_device_name); |
a2de48ca GKH |
1368 | |
1369 | return error; | |
1370 | } | |
a2807dbc | 1371 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1372 | |
1373 | static int device_move_class_links(struct device *dev, | |
1374 | struct device *old_parent, | |
1375 | struct device *new_parent) | |
1376 | { | |
f7f3461d | 1377 | int error = 0; |
8a82472f | 1378 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1379 | char *class_name; |
1380 | ||
1381 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1382 | if (!class_name) { | |
cb360bbf | 1383 | error = -ENOMEM; |
8a82472f CH |
1384 | goto out; |
1385 | } | |
1386 | if (old_parent) { | |
1387 | sysfs_remove_link(&dev->kobj, "device"); | |
1388 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1389 | } | |
c744aeae CH |
1390 | if (new_parent) { |
1391 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1392 | "device"); | |
1393 | if (error) | |
1394 | goto out; | |
1395 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1396 | class_name); | |
1397 | if (error) | |
1398 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1399 | } else |
c744aeae | 1400 | error = 0; |
8a82472f CH |
1401 | out: |
1402 | kfree(class_name); | |
1403 | return error; | |
1404 | #else | |
f7f3461d GKH |
1405 | if (old_parent) |
1406 | sysfs_remove_link(&dev->kobj, "device"); | |
1407 | if (new_parent) | |
1408 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1409 | "device"); | |
1410 | return error; | |
8a82472f CH |
1411 | #endif |
1412 | } | |
1413 | ||
1414 | /** | |
1415 | * device_move - moves a device to a new parent | |
1416 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1417 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1418 | */ |
1419 | int device_move(struct device *dev, struct device *new_parent) | |
1420 | { | |
1421 | int error; | |
1422 | struct device *old_parent; | |
c744aeae | 1423 | struct kobject *new_parent_kobj; |
8a82472f CH |
1424 | |
1425 | dev = get_device(dev); | |
1426 | if (!dev) | |
1427 | return -EINVAL; | |
1428 | ||
8a82472f | 1429 | new_parent = get_device(new_parent); |
4a3ad20c | 1430 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1431 | |
7dc72b28 | 1432 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
2b3a302a | 1433 | __func__, new_parent ? new_parent->bus_id : "<NULL>"); |
c744aeae | 1434 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1435 | if (error) { |
63b6971a | 1436 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1437 | put_device(new_parent); |
1438 | goto out; | |
1439 | } | |
1440 | old_parent = dev->parent; | |
1441 | dev->parent = new_parent; | |
1442 | if (old_parent) | |
acf02d23 | 1443 | klist_remove(&dev->knode_parent); |
0d358f22 | 1444 | if (new_parent) { |
c744aeae | 1445 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); |
0d358f22 YL |
1446 | set_dev_node(dev, dev_to_node(new_parent)); |
1447 | } | |
1448 | ||
8a82472f CH |
1449 | if (!dev->class) |
1450 | goto out_put; | |
1451 | error = device_move_class_links(dev, old_parent, new_parent); | |
1452 | if (error) { | |
1453 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1454 | device_move_class_links(dev, new_parent, old_parent); | |
1455 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1456 | if (new_parent) |
1457 | klist_remove(&dev->knode_parent); | |
0d358f22 YL |
1458 | dev->parent = old_parent; |
1459 | if (old_parent) { | |
8a82472f CH |
1460 | klist_add_tail(&dev->knode_parent, |
1461 | &old_parent->klist_children); | |
0d358f22 YL |
1462 | set_dev_node(dev, dev_to_node(old_parent)); |
1463 | } | |
8a82472f | 1464 | } |
63b6971a | 1465 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1466 | put_device(new_parent); |
1467 | goto out; | |
1468 | } | |
1469 | out_put: | |
1470 | put_device(old_parent); | |
1471 | out: | |
1472 | put_device(dev); | |
1473 | return error; | |
1474 | } | |
8a82472f | 1475 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1476 | |
1477 | /** | |
1478 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1479 | */ | |
1480 | void device_shutdown(void) | |
1481 | { | |
4a3ad20c | 1482 | struct device *dev, *devn; |
37b0c020 GKH |
1483 | |
1484 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1485 | kobj.entry) { | |
1486 | if (dev->bus && dev->bus->shutdown) { | |
1487 | dev_dbg(dev, "shutdown\n"); | |
1488 | dev->bus->shutdown(dev); | |
1489 | } else if (dev->driver && dev->driver->shutdown) { | |
1490 | dev_dbg(dev, "shutdown\n"); | |
1491 | dev->driver->shutdown(dev); | |
1492 | } | |
1493 | } | |
e105b8bf DW |
1494 | kobject_put(sysfs_dev_char_kobj); |
1495 | kobject_put(sysfs_dev_block_kobj); | |
1496 | kobject_put(dev_kobj); | |
37b0c020 | 1497 | } |