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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
23681e47 | 19 | #include <linux/kdev_t.h> |
116af378 | 20 | #include <linux/notifier.h> |
da231fd5 | 21 | #include <linux/genhd.h> |
815d2d50 | 22 | #include <linux/kallsyms.h> |
6188e10d | 23 | #include <linux/semaphore.h> |
f75b1c60 | 24 | #include <linux/mutex.h> |
1da177e4 LT |
25 | |
26 | #include "base.h" | |
27 | #include "power/power.h" | |
28 | ||
4a3ad20c GKH |
29 | int (*platform_notify)(struct device *dev) = NULL; |
30 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
e105b8bf DW |
31 | static struct kobject *dev_kobj; |
32 | struct kobject *sysfs_dev_char_kobj; | |
33 | struct kobject *sysfs_dev_block_kobj; | |
1da177e4 | 34 | |
4e886c29 GKH |
35 | #ifdef CONFIG_BLOCK |
36 | static inline int device_is_not_partition(struct device *dev) | |
37 | { | |
38 | return !(dev->type == &part_type); | |
39 | } | |
40 | #else | |
41 | static inline int device_is_not_partition(struct device *dev) | |
42 | { | |
43 | return 1; | |
44 | } | |
45 | #endif | |
1da177e4 | 46 | |
3e95637a AS |
47 | /** |
48 | * dev_driver_string - Return a device's driver name, if at all possible | |
49 | * @dev: struct device to get the name of | |
50 | * | |
51 | * Will return the device's driver's name if it is bound to a device. If | |
52 | * the device is not bound to a device, it will return the name of the bus | |
53 | * it is attached to. If it is not attached to a bus either, an empty | |
54 | * string will be returned. | |
55 | */ | |
bf9ca69f | 56 | const char *dev_driver_string(const struct device *dev) |
3e95637a AS |
57 | { |
58 | return dev->driver ? dev->driver->name : | |
a456b702 JD |
59 | (dev->bus ? dev->bus->name : |
60 | (dev->class ? dev->class->name : "")); | |
3e95637a | 61 | } |
310a922d | 62 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 63 | |
1da177e4 LT |
64 | #define to_dev(obj) container_of(obj, struct device, kobj) |
65 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
66 | ||
4a3ad20c GKH |
67 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
68 | char *buf) | |
1da177e4 | 69 | { |
4a3ad20c GKH |
70 | struct device_attribute *dev_attr = to_dev_attr(attr); |
71 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 72 | ssize_t ret = -EIO; |
1da177e4 LT |
73 | |
74 | if (dev_attr->show) | |
54b6f35c | 75 | ret = dev_attr->show(dev, dev_attr, buf); |
815d2d50 AM |
76 | if (ret >= (ssize_t)PAGE_SIZE) { |
77 | print_symbol("dev_attr_show: %s returned bad count\n", | |
78 | (unsigned long)dev_attr->show); | |
79 | } | |
1da177e4 LT |
80 | return ret; |
81 | } | |
82 | ||
4a3ad20c GKH |
83 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
84 | const char *buf, size_t count) | |
1da177e4 | 85 | { |
4a3ad20c GKH |
86 | struct device_attribute *dev_attr = to_dev_attr(attr); |
87 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 88 | ssize_t ret = -EIO; |
1da177e4 LT |
89 | |
90 | if (dev_attr->store) | |
54b6f35c | 91 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
92 | return ret; |
93 | } | |
94 | ||
95 | static struct sysfs_ops dev_sysfs_ops = { | |
96 | .show = dev_attr_show, | |
97 | .store = dev_attr_store, | |
98 | }; | |
99 | ||
100 | ||
101 | /** | |
102 | * device_release - free device structure. | |
103 | * @kobj: device's kobject. | |
104 | * | |
105 | * This is called once the reference count for the object | |
106 | * reaches 0. We forward the call to the device's release | |
107 | * method, which should handle actually freeing the structure. | |
108 | */ | |
4a3ad20c | 109 | static void device_release(struct kobject *kobj) |
1da177e4 | 110 | { |
4a3ad20c | 111 | struct device *dev = to_dev(kobj); |
1da177e4 LT |
112 | |
113 | if (dev->release) | |
114 | dev->release(dev); | |
f9f852df KS |
115 | else if (dev->type && dev->type->release) |
116 | dev->type->release(dev); | |
2620efef GKH |
117 | else if (dev->class && dev->class->dev_release) |
118 | dev->class->dev_release(dev); | |
f810a5cf AV |
119 | else |
120 | WARN(1, KERN_ERR "Device '%s' does not have a release() " | |
4a3ad20c | 121 | "function, it is broken and must be fixed.\n", |
1da177e4 | 122 | dev->bus_id); |
1da177e4 LT |
123 | } |
124 | ||
8f4afc41 | 125 | static struct kobj_type device_ktype = { |
1da177e4 LT |
126 | .release = device_release, |
127 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
128 | }; |
129 | ||
130 | ||
312c004d | 131 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
132 | { |
133 | struct kobj_type *ktype = get_ktype(kobj); | |
134 | ||
8f4afc41 | 135 | if (ktype == &device_ktype) { |
1da177e4 | 136 | struct device *dev = to_dev(kobj); |
83b5fb4c CH |
137 | if (dev->uevent_suppress) |
138 | return 0; | |
1da177e4 LT |
139 | if (dev->bus) |
140 | return 1; | |
23681e47 GKH |
141 | if (dev->class) |
142 | return 1; | |
1da177e4 LT |
143 | } |
144 | return 0; | |
145 | } | |
146 | ||
312c004d | 147 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
148 | { |
149 | struct device *dev = to_dev(kobj); | |
150 | ||
23681e47 GKH |
151 | if (dev->bus) |
152 | return dev->bus->name; | |
153 | if (dev->class) | |
154 | return dev->class->name; | |
155 | return NULL; | |
1da177e4 LT |
156 | } |
157 | ||
7eff2e7a KS |
158 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
159 | struct kobj_uevent_env *env) | |
1da177e4 LT |
160 | { |
161 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
162 | int retval = 0; |
163 | ||
23681e47 GKH |
164 | /* add the major/minor if present */ |
165 | if (MAJOR(dev->devt)) { | |
7eff2e7a KS |
166 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
167 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
23681e47 GKH |
168 | } |
169 | ||
414264f9 | 170 | if (dev->type && dev->type->name) |
7eff2e7a | 171 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 172 | |
239378f1 | 173 | if (dev->driver) |
7eff2e7a | 174 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 175 | |
a87cb2ac | 176 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
177 | if (dev->class) { |
178 | struct device *parent = dev->parent; | |
179 | ||
180 | /* find first bus device in parent chain */ | |
181 | while (parent && !parent->bus) | |
182 | parent = parent->parent; | |
183 | if (parent && parent->bus) { | |
184 | const char *path; | |
185 | ||
186 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 187 | if (path) { |
7eff2e7a | 188 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
189 | kfree(path); |
190 | } | |
239378f1 | 191 | |
7eff2e7a | 192 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
193 | |
194 | if (parent->driver) | |
7eff2e7a KS |
195 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
196 | parent->driver->name); | |
239378f1 KS |
197 | } |
198 | } else if (dev->bus) { | |
7eff2e7a | 199 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
200 | |
201 | if (dev->driver) | |
4a3ad20c GKH |
202 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
203 | dev->driver->name); | |
d81d9d6b | 204 | } |
239378f1 | 205 | #endif |
1da177e4 | 206 | |
7eff2e7a | 207 | /* have the bus specific function add its stuff */ |
312c004d | 208 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 209 | retval = dev->bus->uevent(dev, env); |
f9f852df | 210 | if (retval) |
7dc72b28 | 211 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
2b3a302a | 212 | dev->bus_id, __func__, retval); |
1da177e4 LT |
213 | } |
214 | ||
7eff2e7a | 215 | /* have the class specific function add its stuff */ |
2620efef | 216 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 217 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 218 | if (retval) |
7dc72b28 GKH |
219 | pr_debug("device: '%s': %s: class uevent() " |
220 | "returned %d\n", dev->bus_id, | |
2b3a302a | 221 | __func__, retval); |
f9f852df KS |
222 | } |
223 | ||
7eff2e7a | 224 | /* have the device type specific fuction add its stuff */ |
f9f852df | 225 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 226 | retval = dev->type->uevent(dev, env); |
f9f852df | 227 | if (retval) |
7dc72b28 GKH |
228 | pr_debug("device: '%s': %s: dev_type uevent() " |
229 | "returned %d\n", dev->bus_id, | |
2b3a302a | 230 | __func__, retval); |
2620efef GKH |
231 | } |
232 | ||
1da177e4 LT |
233 | return retval; |
234 | } | |
235 | ||
312c004d KS |
236 | static struct kset_uevent_ops device_uevent_ops = { |
237 | .filter = dev_uevent_filter, | |
238 | .name = dev_uevent_name, | |
239 | .uevent = dev_uevent, | |
1da177e4 LT |
240 | }; |
241 | ||
16574dcc KS |
242 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
243 | char *buf) | |
244 | { | |
245 | struct kobject *top_kobj; | |
246 | struct kset *kset; | |
7eff2e7a | 247 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
248 | int i; |
249 | size_t count = 0; | |
250 | int retval; | |
251 | ||
252 | /* search the kset, the device belongs to */ | |
253 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
254 | while (!top_kobj->kset && top_kobj->parent) |
255 | top_kobj = top_kobj->parent; | |
16574dcc KS |
256 | if (!top_kobj->kset) |
257 | goto out; | |
5c5daf65 | 258 | |
16574dcc KS |
259 | kset = top_kobj->kset; |
260 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
261 | goto out; | |
262 | ||
263 | /* respect filter */ | |
264 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
265 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
266 | goto out; | |
267 | ||
7eff2e7a KS |
268 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
269 | if (!env) | |
c7308c81 GKH |
270 | return -ENOMEM; |
271 | ||
16574dcc | 272 | /* let the kset specific function add its keys */ |
7eff2e7a | 273 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
274 | if (retval) |
275 | goto out; | |
276 | ||
277 | /* copy keys to file */ | |
7eff2e7a KS |
278 | for (i = 0; i < env->envp_idx; i++) |
279 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 280 | out: |
7eff2e7a | 281 | kfree(env); |
16574dcc KS |
282 | return count; |
283 | } | |
284 | ||
a7fd6706 KS |
285 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
286 | const char *buf, size_t count) | |
287 | { | |
60a96a59 KS |
288 | enum kobject_action action; |
289 | ||
5c5daf65 | 290 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
291 | kobject_uevent(&dev->kobj, action); |
292 | goto out; | |
293 | } | |
294 | ||
295 | dev_err(dev, "uevent: unsupported action-string; this will " | |
296 | "be ignored in a future kernel version\n"); | |
312c004d | 297 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 298 | out: |
a7fd6706 KS |
299 | return count; |
300 | } | |
301 | ||
ad6a1e1c TH |
302 | static struct device_attribute uevent_attr = |
303 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
304 | ||
621a1672 DT |
305 | static int device_add_attributes(struct device *dev, |
306 | struct device_attribute *attrs) | |
de0ff00d | 307 | { |
621a1672 | 308 | int error = 0; |
de0ff00d | 309 | int i; |
621a1672 DT |
310 | |
311 | if (attrs) { | |
312 | for (i = 0; attr_name(attrs[i]); i++) { | |
313 | error = device_create_file(dev, &attrs[i]); | |
314 | if (error) | |
315 | break; | |
316 | } | |
317 | if (error) | |
318 | while (--i >= 0) | |
319 | device_remove_file(dev, &attrs[i]); | |
320 | } | |
321 | return error; | |
322 | } | |
323 | ||
324 | static void device_remove_attributes(struct device *dev, | |
325 | struct device_attribute *attrs) | |
326 | { | |
327 | int i; | |
328 | ||
329 | if (attrs) | |
330 | for (i = 0; attr_name(attrs[i]); i++) | |
331 | device_remove_file(dev, &attrs[i]); | |
332 | } | |
333 | ||
334 | static int device_add_groups(struct device *dev, | |
335 | struct attribute_group **groups) | |
336 | { | |
de0ff00d | 337 | int error = 0; |
621a1672 | 338 | int i; |
de0ff00d | 339 | |
621a1672 DT |
340 | if (groups) { |
341 | for (i = 0; groups[i]; i++) { | |
342 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
343 | if (error) { |
344 | while (--i >= 0) | |
4a3ad20c GKH |
345 | sysfs_remove_group(&dev->kobj, |
346 | groups[i]); | |
621a1672 | 347 | break; |
de0ff00d GKH |
348 | } |
349 | } | |
350 | } | |
de0ff00d GKH |
351 | return error; |
352 | } | |
353 | ||
621a1672 DT |
354 | static void device_remove_groups(struct device *dev, |
355 | struct attribute_group **groups) | |
de0ff00d GKH |
356 | { |
357 | int i; | |
621a1672 DT |
358 | |
359 | if (groups) | |
360 | for (i = 0; groups[i]; i++) | |
361 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
362 | } |
363 | ||
2620efef GKH |
364 | static int device_add_attrs(struct device *dev) |
365 | { | |
366 | struct class *class = dev->class; | |
f9f852df | 367 | struct device_type *type = dev->type; |
621a1672 | 368 | int error; |
2620efef | 369 | |
621a1672 DT |
370 | if (class) { |
371 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 372 | if (error) |
621a1672 | 373 | return error; |
2620efef | 374 | } |
f9f852df | 375 | |
621a1672 DT |
376 | if (type) { |
377 | error = device_add_groups(dev, type->groups); | |
f9f852df | 378 | if (error) |
621a1672 | 379 | goto err_remove_class_attrs; |
f9f852df KS |
380 | } |
381 | ||
621a1672 DT |
382 | error = device_add_groups(dev, dev->groups); |
383 | if (error) | |
384 | goto err_remove_type_groups; | |
385 | ||
386 | return 0; | |
387 | ||
388 | err_remove_type_groups: | |
389 | if (type) | |
390 | device_remove_groups(dev, type->groups); | |
391 | err_remove_class_attrs: | |
392 | if (class) | |
393 | device_remove_attributes(dev, class->dev_attrs); | |
394 | ||
2620efef GKH |
395 | return error; |
396 | } | |
397 | ||
398 | static void device_remove_attrs(struct device *dev) | |
399 | { | |
400 | struct class *class = dev->class; | |
f9f852df | 401 | struct device_type *type = dev->type; |
2620efef | 402 | |
621a1672 | 403 | device_remove_groups(dev, dev->groups); |
f9f852df | 404 | |
621a1672 DT |
405 | if (type) |
406 | device_remove_groups(dev, type->groups); | |
407 | ||
408 | if (class) | |
409 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
410 | } |
411 | ||
412 | ||
23681e47 GKH |
413 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
414 | char *buf) | |
415 | { | |
416 | return print_dev_t(buf, dev->devt); | |
417 | } | |
418 | ||
ad6a1e1c TH |
419 | static struct device_attribute devt_attr = |
420 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
421 | ||
881c6cfd GKH |
422 | /* kset to create /sys/devices/ */ |
423 | struct kset *devices_kset; | |
1da177e4 | 424 | |
1da177e4 | 425 | /** |
4a3ad20c GKH |
426 | * device_create_file - create sysfs attribute file for device. |
427 | * @dev: device. | |
428 | * @attr: device attribute descriptor. | |
1da177e4 | 429 | */ |
4a3ad20c | 430 | int device_create_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
431 | { |
432 | int error = 0; | |
0c98b19f | 433 | if (dev) |
1da177e4 | 434 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
435 | return error; |
436 | } | |
437 | ||
438 | /** | |
4a3ad20c GKH |
439 | * device_remove_file - remove sysfs attribute file. |
440 | * @dev: device. | |
441 | * @attr: device attribute descriptor. | |
1da177e4 | 442 | */ |
4a3ad20c | 443 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
1da177e4 | 444 | { |
0c98b19f | 445 | if (dev) |
1da177e4 | 446 | sysfs_remove_file(&dev->kobj, &attr->attr); |
1da177e4 LT |
447 | } |
448 | ||
2589f188 GKH |
449 | /** |
450 | * device_create_bin_file - create sysfs binary attribute file for device. | |
451 | * @dev: device. | |
452 | * @attr: device binary attribute descriptor. | |
453 | */ | |
454 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
455 | { | |
456 | int error = -EINVAL; | |
457 | if (dev) | |
458 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
459 | return error; | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
462 | ||
463 | /** | |
464 | * device_remove_bin_file - remove sysfs binary attribute file | |
465 | * @dev: device. | |
466 | * @attr: device binary attribute descriptor. | |
467 | */ | |
468 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
469 | { | |
470 | if (dev) | |
471 | sysfs_remove_bin_file(&dev->kobj, attr); | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
474 | ||
d9a9cdfb | 475 | /** |
523ded71 | 476 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
477 | * @dev: device. |
478 | * @func: callback function to invoke later. | |
523ded71 | 479 | * @owner: module owning the callback routine |
d9a9cdfb AS |
480 | * |
481 | * Attribute methods must not unregister themselves or their parent device | |
482 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
483 | * since unregistration is mutually exclusive with driver callbacks. | |
484 | * | |
485 | * Instead methods can call this routine, which will attempt to allocate | |
486 | * and schedule a workqueue request to call back @func with @dev as its | |
487 | * argument in the workqueue's process context. @dev will be pinned until | |
488 | * @func returns. | |
489 | * | |
523ded71 AS |
490 | * This routine is usually called via the inline device_schedule_callback(), |
491 | * which automatically sets @owner to THIS_MODULE. | |
492 | * | |
d9a9cdfb | 493 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 494 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
495 | * |
496 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
497 | * underlying sysfs routine (since it is intended for use by attribute | |
498 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
499 | */ | |
523ded71 AS |
500 | int device_schedule_callback_owner(struct device *dev, |
501 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
502 | { |
503 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 504 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 505 | } |
523ded71 | 506 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 507 | |
34bb61f9 JB |
508 | static void klist_children_get(struct klist_node *n) |
509 | { | |
510 | struct device *dev = container_of(n, struct device, knode_parent); | |
511 | ||
512 | get_device(dev); | |
513 | } | |
514 | ||
515 | static void klist_children_put(struct klist_node *n) | |
516 | { | |
517 | struct device *dev = container_of(n, struct device, knode_parent); | |
518 | ||
519 | put_device(dev); | |
520 | } | |
521 | ||
1da177e4 | 522 | /** |
4a3ad20c GKH |
523 | * device_initialize - init device structure. |
524 | * @dev: device. | |
1da177e4 | 525 | * |
4a3ad20c GKH |
526 | * This prepares the device for use by other layers, |
527 | * including adding it to the device hierarchy. | |
528 | * It is the first half of device_register(), if called by | |
529 | * that, though it can also be called separately, so one | |
530 | * may use @dev's fields (e.g. the refcount). | |
1da177e4 | 531 | */ |
1da177e4 LT |
532 | void device_initialize(struct device *dev) |
533 | { | |
881c6cfd | 534 | dev->kobj.kset = devices_kset; |
f9cb074b | 535 | kobject_init(&dev->kobj, &device_ktype); |
34bb61f9 JB |
536 | klist_init(&dev->klist_children, klist_children_get, |
537 | klist_children_put); | |
1da177e4 | 538 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 539 | INIT_LIST_HEAD(&dev->node); |
af70316a | 540 | init_MUTEX(&dev->sem); |
9ac7849e TH |
541 | spin_lock_init(&dev->devres_lock); |
542 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 543 | device_init_wakeup(dev, 0); |
3b98aeaf | 544 | device_pm_init(dev); |
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)) |
1fbfee6c | 554 | return &dev->class->p->class_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 | |
1fbfee6c GKH |
660 | error = sysfs_create_link(&dev->kobj, |
661 | &dev->class->p->class_subsys.kobj, | |
2ee97caf CH |
662 | "subsystem"); |
663 | if (error) | |
664 | goto out; | |
da231fd5 KS |
665 | |
666 | #ifdef CONFIG_SYSFS_DEPRECATED | |
667 | /* stacked class devices need a symlink in the class directory */ | |
1fbfee6c | 668 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 669 | device_is_not_partition(dev)) { |
1fbfee6c | 670 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
7c71448b | 671 | &dev->kobj, dev->bus_id); |
2ee97caf CH |
672 | if (error) |
673 | goto out_subsys; | |
674 | } | |
da231fd5 | 675 | |
4e886c29 | 676 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
677 | struct device *parent = dev->parent; |
678 | char *class_name; | |
4f01a757 | 679 | |
da231fd5 KS |
680 | /* |
681 | * stacked class devices have the 'device' link | |
682 | * pointing to the bus device instead of the parent | |
683 | */ | |
684 | while (parent->class && !parent->bus && parent->parent) | |
685 | parent = parent->parent; | |
686 | ||
687 | error = sysfs_create_link(&dev->kobj, | |
688 | &parent->kobj, | |
4f01a757 DT |
689 | "device"); |
690 | if (error) | |
691 | goto out_busid; | |
da231fd5 KS |
692 | |
693 | class_name = make_class_name(dev->class->name, | |
694 | &dev->kobj); | |
695 | if (class_name) | |
696 | error = sysfs_create_link(&dev->parent->kobj, | |
697 | &dev->kobj, class_name); | |
698 | kfree(class_name); | |
699 | if (error) | |
700 | goto out_device; | |
2ee97caf CH |
701 | } |
702 | return 0; | |
703 | ||
2ee97caf | 704 | out_device: |
4e886c29 | 705 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 706 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 707 | out_busid: |
1fbfee6c | 708 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 709 | device_is_not_partition(dev)) |
1fbfee6c GKH |
710 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
711 | dev->bus_id); | |
da231fd5 KS |
712 | #else |
713 | /* link in the class directory pointing to the device */ | |
1fbfee6c GKH |
714 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
715 | &dev->kobj, dev->bus_id); | |
da231fd5 KS |
716 | if (error) |
717 | goto out_subsys; | |
718 | ||
4e886c29 | 719 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
720 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
721 | "device"); | |
722 | if (error) | |
723 | goto out_busid; | |
724 | } | |
725 | return 0; | |
726 | ||
727 | out_busid: | |
1fbfee6c | 728 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id); |
da231fd5 KS |
729 | #endif |
730 | ||
2ee97caf CH |
731 | out_subsys: |
732 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
733 | out: | |
734 | return error; | |
735 | } | |
736 | ||
737 | static void device_remove_class_symlinks(struct device *dev) | |
738 | { | |
739 | if (!dev->class) | |
740 | return; | |
da231fd5 | 741 | |
2ee97caf | 742 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 743 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
744 | char *class_name; |
745 | ||
746 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
747 | if (class_name) { | |
748 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
749 | kfree(class_name); | |
750 | } | |
2ee97caf CH |
751 | sysfs_remove_link(&dev->kobj, "device"); |
752 | } | |
da231fd5 | 753 | |
1fbfee6c | 754 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 755 | device_is_not_partition(dev)) |
1fbfee6c GKH |
756 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
757 | dev->bus_id); | |
da231fd5 | 758 | #else |
4e886c29 | 759 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
760 | sysfs_remove_link(&dev->kobj, "device"); |
761 | ||
1fbfee6c | 762 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id); |
da231fd5 KS |
763 | #endif |
764 | ||
2ee97caf CH |
765 | sysfs_remove_link(&dev->kobj, "subsystem"); |
766 | } | |
767 | ||
413c239f SR |
768 | /** |
769 | * dev_set_name - set a device name | |
770 | * @dev: device | |
46232366 | 771 | * @fmt: format string for the device's name |
413c239f SR |
772 | */ |
773 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
774 | { | |
775 | va_list vargs; | |
776 | ||
777 | va_start(vargs, fmt); | |
778 | vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs); | |
779 | va_end(vargs); | |
780 | return 0; | |
781 | } | |
782 | EXPORT_SYMBOL_GPL(dev_set_name); | |
783 | ||
e105b8bf DW |
784 | /** |
785 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
786 | * @dev: device | |
787 | * | |
788 | * By default we select char/ for new entries. Setting class->dev_obj | |
789 | * to NULL prevents an entry from being created. class->dev_kobj must | |
790 | * be set (or cleared) before any devices are registered to the class | |
791 | * otherwise device_create_sys_dev_entry() and | |
792 | * device_remove_sys_dev_entry() will disagree about the the presence | |
793 | * of the link. | |
794 | */ | |
795 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
796 | { | |
797 | struct kobject *kobj; | |
798 | ||
799 | if (dev->class) | |
800 | kobj = dev->class->dev_kobj; | |
801 | else | |
802 | kobj = sysfs_dev_char_kobj; | |
803 | ||
804 | return kobj; | |
805 | } | |
806 | ||
807 | static int device_create_sys_dev_entry(struct device *dev) | |
808 | { | |
809 | struct kobject *kobj = device_to_dev_kobj(dev); | |
810 | int error = 0; | |
811 | char devt_str[15]; | |
812 | ||
813 | if (kobj) { | |
814 | format_dev_t(devt_str, dev->devt); | |
815 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
816 | } | |
817 | ||
818 | return error; | |
819 | } | |
820 | ||
821 | static void device_remove_sys_dev_entry(struct device *dev) | |
822 | { | |
823 | struct kobject *kobj = device_to_dev_kobj(dev); | |
824 | char devt_str[15]; | |
825 | ||
826 | if (kobj) { | |
827 | format_dev_t(devt_str, dev->devt); | |
828 | sysfs_remove_link(kobj, devt_str); | |
829 | } | |
830 | } | |
831 | ||
1da177e4 | 832 | /** |
4a3ad20c GKH |
833 | * device_add - add device to device hierarchy. |
834 | * @dev: device. | |
1da177e4 | 835 | * |
4a3ad20c GKH |
836 | * This is part 2 of device_register(), though may be called |
837 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 838 | * |
4a3ad20c GKH |
839 | * This adds it to the kobject hierarchy via kobject_add(), adds it |
840 | * to the global and sibling lists for the device, then | |
841 | * adds it to the other relevant subsystems of the driver model. | |
1da177e4 LT |
842 | */ |
843 | int device_add(struct device *dev) | |
844 | { | |
845 | struct device *parent = NULL; | |
c47ed219 | 846 | struct class_interface *class_intf; |
c906a48a | 847 | int error = -EINVAL; |
775b64d2 | 848 | |
1da177e4 | 849 | dev = get_device(dev); |
c906a48a GKH |
850 | if (!dev) |
851 | goto done; | |
852 | ||
853 | /* Temporarily support init_name if it is set. | |
854 | * It will override bus_id for now */ | |
855 | if (dev->init_name) | |
856 | dev_set_name(dev, "%s", dev->init_name); | |
857 | ||
858 | if (!strlen(dev->bus_id)) | |
859 | goto done; | |
1da177e4 | 860 | |
2b3a302a | 861 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
c205ef48 | 862 | |
1da177e4 | 863 | parent = get_device(dev->parent); |
63b6971a | 864 | setup_parent(dev, parent); |
1da177e4 | 865 | |
0d358f22 YL |
866 | /* use parent numa_node */ |
867 | if (parent) | |
868 | set_dev_node(dev, dev_to_node(parent)); | |
869 | ||
1da177e4 | 870 | /* first, register with generic layer. */ |
b2d6db58 | 871 | error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
40fa5422 | 872 | if (error) |
1da177e4 | 873 | goto Error; |
a7fd6706 | 874 | |
37022644 BW |
875 | /* notify platform of device entry */ |
876 | if (platform_notify) | |
877 | platform_notify(dev); | |
878 | ||
116af378 BH |
879 | /* notify clients of device entry (new way) */ |
880 | if (dev->bus) | |
c6f7e72a | 881 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
882 | BUS_NOTIFY_ADD_DEVICE, dev); |
883 | ||
ad6a1e1c | 884 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
885 | if (error) |
886 | goto attrError; | |
a7fd6706 | 887 | |
23681e47 | 888 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
889 | error = device_create_file(dev, &devt_attr); |
890 | if (error) | |
a306eea4 | 891 | goto ueventattrError; |
e105b8bf DW |
892 | |
893 | error = device_create_sys_dev_entry(dev); | |
894 | if (error) | |
895 | goto devtattrError; | |
23681e47 GKH |
896 | } |
897 | ||
2ee97caf CH |
898 | error = device_add_class_symlinks(dev); |
899 | if (error) | |
900 | goto SymlinkError; | |
dc0afa83 CH |
901 | error = device_add_attrs(dev); |
902 | if (error) | |
2620efef | 903 | goto AttrsError; |
dc0afa83 CH |
904 | error = bus_add_device(dev); |
905 | if (error) | |
1da177e4 | 906 | goto BusError; |
3b98aeaf | 907 | error = dpm_sysfs_add(dev); |
57eee3d2 | 908 | if (error) |
3b98aeaf AS |
909 | goto DPMError; |
910 | device_pm_add(dev); | |
83b5fb4c | 911 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 912 | bus_attach_device(dev); |
1da177e4 | 913 | if (parent) |
d856f1e3 | 914 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 915 | |
5d9fd169 | 916 | if (dev->class) { |
f75b1c60 | 917 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 918 | /* tie the class to the device */ |
97ae69fd | 919 | list_add_tail(&dev->node, &dev->class->p->class_devices); |
c47ed219 GKH |
920 | |
921 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
922 | list_for_each_entry(class_intf, |
923 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
924 | if (class_intf->add_dev) |
925 | class_intf->add_dev(dev, class_intf); | |
f75b1c60 | 926 | mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169 | 927 | } |
c906a48a | 928 | done: |
1da177e4 LT |
929 | put_device(dev); |
930 | return error; | |
3b98aeaf | 931 | DPMError: |
57eee3d2 RW |
932 | bus_remove_device(dev); |
933 | BusError: | |
116af378 | 934 | if (dev->bus) |
c6f7e72a | 935 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 936 | BUS_NOTIFY_DEL_DEVICE, dev); |
82f0cf9b | 937 | device_remove_attrs(dev); |
2620efef | 938 | AttrsError: |
2ee97caf CH |
939 | device_remove_class_symlinks(dev); |
940 | SymlinkError: | |
e105b8bf DW |
941 | if (MAJOR(dev->devt)) |
942 | device_remove_sys_dev_entry(dev); | |
943 | devtattrError: | |
ad6a1e1c TH |
944 | if (MAJOR(dev->devt)) |
945 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 946 | ueventattrError: |
ad6a1e1c | 947 | device_remove_file(dev, &uevent_attr); |
23681e47 | 948 | attrError: |
312c004d | 949 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
950 | kobject_del(&dev->kobj); |
951 | Error: | |
63b6971a | 952 | cleanup_device_parent(dev); |
1da177e4 LT |
953 | if (parent) |
954 | put_device(parent); | |
c906a48a | 955 | goto done; |
1da177e4 LT |
956 | } |
957 | ||
1da177e4 | 958 | /** |
4a3ad20c GKH |
959 | * device_register - register a device with the system. |
960 | * @dev: pointer to the device structure | |
1da177e4 | 961 | * |
4a3ad20c GKH |
962 | * This happens in two clean steps - initialize the device |
963 | * and add it to the system. The two steps can be called | |
964 | * separately, but this is the easiest and most common. | |
965 | * I.e. you should only call the two helpers separately if | |
966 | * have a clearly defined need to use and refcount the device | |
967 | * before it is added to the hierarchy. | |
1da177e4 | 968 | */ |
1da177e4 LT |
969 | int device_register(struct device *dev) |
970 | { | |
971 | device_initialize(dev); | |
972 | return device_add(dev); | |
973 | } | |
974 | ||
1da177e4 | 975 | /** |
4a3ad20c GKH |
976 | * get_device - increment reference count for device. |
977 | * @dev: device. | |
1da177e4 | 978 | * |
4a3ad20c GKH |
979 | * This simply forwards the call to kobject_get(), though |
980 | * we do take care to provide for the case that we get a NULL | |
981 | * pointer passed in. | |
1da177e4 | 982 | */ |
4a3ad20c | 983 | struct device *get_device(struct device *dev) |
1da177e4 LT |
984 | { |
985 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
986 | } | |
987 | ||
1da177e4 | 988 | /** |
4a3ad20c GKH |
989 | * put_device - decrement reference count. |
990 | * @dev: device in question. | |
1da177e4 | 991 | */ |
4a3ad20c | 992 | void put_device(struct device *dev) |
1da177e4 | 993 | { |
edfaa7c3 | 994 | /* might_sleep(); */ |
1da177e4 LT |
995 | if (dev) |
996 | kobject_put(&dev->kobj); | |
997 | } | |
998 | ||
1da177e4 | 999 | /** |
4a3ad20c GKH |
1000 | * device_del - delete device from system. |
1001 | * @dev: device. | |
1da177e4 | 1002 | * |
4a3ad20c GKH |
1003 | * This is the first part of the device unregistration |
1004 | * sequence. This removes the device from the lists we control | |
1005 | * from here, has it removed from the other driver model | |
1006 | * subsystems it was added to in device_add(), and removes it | |
1007 | * from the kobject hierarchy. | |
1da177e4 | 1008 | * |
4a3ad20c GKH |
1009 | * NOTE: this should be called manually _iff_ device_add() was |
1010 | * also called manually. | |
1da177e4 | 1011 | */ |
4a3ad20c | 1012 | void device_del(struct device *dev) |
1da177e4 | 1013 | { |
4a3ad20c | 1014 | struct device *parent = dev->parent; |
c47ed219 | 1015 | struct class_interface *class_intf; |
1da177e4 | 1016 | |
775b64d2 | 1017 | device_pm_remove(dev); |
3b98aeaf | 1018 | dpm_sysfs_remove(dev); |
1da177e4 | 1019 | if (parent) |
d62c0f9f | 1020 | klist_del(&dev->knode_parent); |
e105b8bf DW |
1021 | if (MAJOR(dev->devt)) { |
1022 | device_remove_sys_dev_entry(dev); | |
ad6a1e1c | 1023 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1024 | } |
b9d9c82b | 1025 | if (dev->class) { |
da231fd5 | 1026 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1027 | |
f75b1c60 | 1028 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 1029 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1030 | list_for_each_entry(class_intf, |
1031 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1032 | if (class_intf->remove_dev) |
1033 | class_intf->remove_dev(dev, class_intf); | |
1034 | /* remove the device from the class list */ | |
5d9fd169 | 1035 | list_del_init(&dev->node); |
f75b1c60 | 1036 | mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b | 1037 | } |
ad6a1e1c | 1038 | device_remove_file(dev, &uevent_attr); |
2620efef | 1039 | device_remove_attrs(dev); |
28953533 | 1040 | bus_remove_device(dev); |
1da177e4 | 1041 | |
2f8d16a9 TH |
1042 | /* |
1043 | * Some platform devices are driven without driver attached | |
1044 | * and managed resources may have been acquired. Make sure | |
1045 | * all resources are released. | |
1046 | */ | |
1047 | devres_release_all(dev); | |
1048 | ||
1da177e4 LT |
1049 | /* Notify the platform of the removal, in case they |
1050 | * need to do anything... | |
1051 | */ | |
1052 | if (platform_notify_remove) | |
1053 | platform_notify_remove(dev); | |
116af378 | 1054 | if (dev->bus) |
c6f7e72a | 1055 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 1056 | BUS_NOTIFY_DEL_DEVICE, dev); |
312c004d | 1057 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1058 | cleanup_device_parent(dev); |
1da177e4 | 1059 | kobject_del(&dev->kobj); |
da231fd5 | 1060 | put_device(parent); |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | /** | |
4a3ad20c GKH |
1064 | * device_unregister - unregister device from system. |
1065 | * @dev: device going away. | |
1da177e4 | 1066 | * |
4a3ad20c GKH |
1067 | * We do this in two parts, like we do device_register(). First, |
1068 | * we remove it from all the subsystems with device_del(), then | |
1069 | * we decrement the reference count via put_device(). If that | |
1070 | * is the final reference count, the device will be cleaned up | |
1071 | * via device_release() above. Otherwise, the structure will | |
1072 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1073 | */ |
4a3ad20c | 1074 | void device_unregister(struct device *dev) |
1da177e4 | 1075 | { |
2b3a302a | 1076 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
1da177e4 LT |
1077 | device_del(dev); |
1078 | put_device(dev); | |
1079 | } | |
1080 | ||
4a3ad20c | 1081 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1082 | { |
4a3ad20c | 1083 | struct klist_node *n = klist_next(i); |
36239577 PM |
1084 | return n ? container_of(n, struct device, knode_parent) : NULL; |
1085 | } | |
1086 | ||
1da177e4 | 1087 | /** |
4a3ad20c GKH |
1088 | * device_for_each_child - device child iterator. |
1089 | * @parent: parent struct device. | |
1090 | * @data: data for the callback. | |
1091 | * @fn: function to be called for each device. | |
1da177e4 | 1092 | * |
4a3ad20c GKH |
1093 | * Iterate over @parent's child devices, and call @fn for each, |
1094 | * passing it @data. | |
1da177e4 | 1095 | * |
4a3ad20c GKH |
1096 | * We check the return of @fn each time. If it returns anything |
1097 | * other than 0, we break out and return that value. | |
1da177e4 | 1098 | */ |
4a3ad20c GKH |
1099 | int device_for_each_child(struct device *parent, void *data, |
1100 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1101 | { |
36239577 | 1102 | struct klist_iter i; |
4a3ad20c | 1103 | struct device *child; |
1da177e4 LT |
1104 | int error = 0; |
1105 | ||
36239577 PM |
1106 | klist_iter_init(&parent->klist_children, &i); |
1107 | while ((child = next_device(&i)) && !error) | |
1108 | error = fn(child, data); | |
1109 | klist_iter_exit(&i); | |
1da177e4 LT |
1110 | return error; |
1111 | } | |
1112 | ||
5ab69981 CH |
1113 | /** |
1114 | * device_find_child - device iterator for locating a particular device. | |
1115 | * @parent: parent struct device | |
1116 | * @data: Data to pass to match function | |
1117 | * @match: Callback function to check device | |
1118 | * | |
1119 | * This is similar to the device_for_each_child() function above, but it | |
1120 | * returns a reference to a device that is 'found' for later use, as | |
1121 | * determined by the @match callback. | |
1122 | * | |
1123 | * The callback should return 0 if the device doesn't match and non-zero | |
1124 | * if it does. If the callback returns non-zero and a reference to the | |
1125 | * current device can be obtained, this function will return to the caller | |
1126 | * and not iterate over any more devices. | |
1127 | */ | |
4a3ad20c GKH |
1128 | struct device *device_find_child(struct device *parent, void *data, |
1129 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1130 | { |
1131 | struct klist_iter i; | |
1132 | struct device *child; | |
1133 | ||
1134 | if (!parent) | |
1135 | return NULL; | |
1136 | ||
1137 | klist_iter_init(&parent->klist_children, &i); | |
1138 | while ((child = next_device(&i))) | |
1139 | if (match(child, data) && get_device(child)) | |
1140 | break; | |
1141 | klist_iter_exit(&i); | |
1142 | return child; | |
1143 | } | |
1144 | ||
1da177e4 LT |
1145 | int __init devices_init(void) |
1146 | { | |
881c6cfd GKH |
1147 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1148 | if (!devices_kset) | |
1149 | return -ENOMEM; | |
e105b8bf DW |
1150 | dev_kobj = kobject_create_and_add("dev", NULL); |
1151 | if (!dev_kobj) | |
1152 | goto dev_kobj_err; | |
1153 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1154 | if (!sysfs_dev_block_kobj) | |
1155 | goto block_kobj_err; | |
1156 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1157 | if (!sysfs_dev_char_kobj) | |
1158 | goto char_kobj_err; | |
1159 | ||
881c6cfd | 1160 | return 0; |
e105b8bf DW |
1161 | |
1162 | char_kobj_err: | |
1163 | kobject_put(sysfs_dev_block_kobj); | |
1164 | block_kobj_err: | |
1165 | kobject_put(dev_kobj); | |
1166 | dev_kobj_err: | |
1167 | kset_unregister(devices_kset); | |
1168 | return -ENOMEM; | |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1172 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1173 | |
1174 | EXPORT_SYMBOL_GPL(device_initialize); | |
1175 | EXPORT_SYMBOL_GPL(device_add); | |
1176 | EXPORT_SYMBOL_GPL(device_register); | |
1177 | ||
1178 | EXPORT_SYMBOL_GPL(device_del); | |
1179 | EXPORT_SYMBOL_GPL(device_unregister); | |
1180 | EXPORT_SYMBOL_GPL(get_device); | |
1181 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1182 | |
1183 | EXPORT_SYMBOL_GPL(device_create_file); | |
1184 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1185 | |
1186 | ||
1187 | static void device_create_release(struct device *dev) | |
1188 | { | |
2b3a302a | 1189 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
23681e47 GKH |
1190 | kfree(dev); |
1191 | } | |
1192 | ||
1193 | /** | |
8882b394 | 1194 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1195 | * @class: pointer to the struct class that this device should be registered to |
1196 | * @parent: pointer to the parent struct device of this new device, if any | |
1197 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1198 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1199 | * @fmt: string for the device's name |
8882b394 | 1200 | * @args: va_list for the device's name |
42734daf HK |
1201 | * |
1202 | * This function can be used by char device classes. A struct device | |
1203 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1204 | * |
23681e47 GKH |
1205 | * A "dev" file will be created, showing the dev_t for the device, if |
1206 | * the dev_t is not 0,0. | |
42734daf HK |
1207 | * If a pointer to a parent struct device is passed in, the newly created |
1208 | * struct device will be a child of that device in sysfs. | |
1209 | * The pointer to the struct device will be returned from the call. | |
1210 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1211 | * pointer. |
1212 | * | |
1213 | * Note: the struct class passed to this function must have previously | |
1214 | * been created with a call to class_create(). | |
1215 | */ | |
8882b394 GKH |
1216 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1217 | dev_t devt, void *drvdata, const char *fmt, | |
1218 | va_list args) | |
23681e47 | 1219 | { |
23681e47 GKH |
1220 | struct device *dev = NULL; |
1221 | int retval = -ENODEV; | |
1222 | ||
1223 | if (class == NULL || IS_ERR(class)) | |
1224 | goto error; | |
23681e47 GKH |
1225 | |
1226 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1227 | if (!dev) { | |
1228 | retval = -ENOMEM; | |
1229 | goto error; | |
1230 | } | |
1231 | ||
1232 | dev->devt = devt; | |
1233 | dev->class = class; | |
1234 | dev->parent = parent; | |
1235 | dev->release = device_create_release; | |
8882b394 | 1236 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1237 | |
23681e47 | 1238 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); |
23681e47 GKH |
1239 | retval = device_register(dev); |
1240 | if (retval) | |
1241 | goto error; | |
1242 | ||
23681e47 GKH |
1243 | return dev; |
1244 | ||
1245 | error: | |
1246 | kfree(dev); | |
1247 | return ERR_PTR(retval); | |
1248 | } | |
8882b394 GKH |
1249 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1250 | ||
1251 | /** | |
4e106739 | 1252 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1253 | * @class: pointer to the struct class that this device should be registered to |
1254 | * @parent: pointer to the parent struct device of this new device, if any | |
1255 | * @devt: the dev_t for the char device to be added | |
1256 | * @drvdata: the data to be added to the device for callbacks | |
1257 | * @fmt: string for the device's name | |
1258 | * | |
1259 | * This function can be used by char device classes. A struct device | |
1260 | * will be created in sysfs, registered to the specified class. | |
1261 | * | |
1262 | * A "dev" file will be created, showing the dev_t for the device, if | |
1263 | * the dev_t is not 0,0. | |
1264 | * If a pointer to a parent struct device is passed in, the newly created | |
1265 | * struct device will be a child of that device in sysfs. | |
1266 | * The pointer to the struct device will be returned from the call. | |
1267 | * Any further sysfs files that might be required can be created using this | |
1268 | * pointer. | |
1269 | * | |
1270 | * Note: the struct class passed to this function must have previously | |
1271 | * been created with a call to class_create(). | |
1272 | */ | |
4e106739 GKH |
1273 | struct device *device_create(struct class *class, struct device *parent, |
1274 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1275 | { |
1276 | va_list vargs; | |
1277 | struct device *dev; | |
1278 | ||
1279 | va_start(vargs, fmt); | |
1280 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1281 | va_end(vargs); | |
1282 | return dev; | |
1283 | } | |
4e106739 | 1284 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1285 | |
cd35449b | 1286 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1287 | { |
cd35449b | 1288 | dev_t *devt = data; |
23681e47 | 1289 | |
cd35449b | 1290 | return dev->devt == *devt; |
775b64d2 RW |
1291 | } |
1292 | ||
1293 | /** | |
1294 | * device_destroy - removes a device that was created with device_create() | |
1295 | * @class: pointer to the struct class that this device was registered with | |
1296 | * @devt: the dev_t of the device that was previously registered | |
1297 | * | |
1298 | * This call unregisters and cleans up a device that was created with a | |
1299 | * call to device_create(). | |
1300 | */ | |
1301 | void device_destroy(struct class *class, dev_t devt) | |
1302 | { | |
1303 | struct device *dev; | |
23681e47 | 1304 | |
695794ae | 1305 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1306 | if (dev) { |
1307 | put_device(dev); | |
23681e47 | 1308 | device_unregister(dev); |
cd35449b | 1309 | } |
23681e47 GKH |
1310 | } |
1311 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1312 | |
1313 | /** | |
1314 | * device_rename - renames a device | |
1315 | * @dev: the pointer to the struct device to be renamed | |
1316 | * @new_name: the new name of the device | |
1317 | */ | |
1318 | int device_rename(struct device *dev, char *new_name) | |
1319 | { | |
1320 | char *old_class_name = NULL; | |
1321 | char *new_class_name = NULL; | |
2ee97caf | 1322 | char *old_device_name = NULL; |
a2de48ca GKH |
1323 | int error; |
1324 | ||
1325 | dev = get_device(dev); | |
1326 | if (!dev) | |
1327 | return -EINVAL; | |
1328 | ||
7dc72b28 | 1329 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
2b3a302a | 1330 | __func__, new_name); |
a2de48ca | 1331 | |
99ef3ef8 | 1332 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1333 | if ((dev->class) && (dev->parent)) |
1334 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1335 | #endif |
a2de48ca | 1336 | |
2ee97caf CH |
1337 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1338 | if (!old_device_name) { | |
1339 | error = -ENOMEM; | |
1340 | goto out; | |
a2de48ca | 1341 | } |
2ee97caf | 1342 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1343 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1344 | ||
1345 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1346 | if (error) { |
1347 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1348 | goto out; | |
1349 | } | |
a2de48ca | 1350 | |
99ef3ef8 | 1351 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1352 | if (old_class_name) { |
1353 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1354 | if (new_class_name) { | |
36ce6dad CH |
1355 | error = sysfs_create_link_nowarn(&dev->parent->kobj, |
1356 | &dev->kobj, | |
1357 | new_class_name); | |
2ee97caf CH |
1358 | if (error) |
1359 | goto out; | |
a2de48ca GKH |
1360 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1361 | } | |
1362 | } | |
60b8cabd | 1363 | #else |
a2de48ca | 1364 | if (dev->class) { |
36ce6dad CH |
1365 | error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, |
1366 | &dev->kobj, dev->bus_id); | |
0599ad53 SH |
1367 | if (error) |
1368 | goto out; | |
1fbfee6c | 1369 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
7c71448b | 1370 | old_device_name); |
a2de48ca | 1371 | } |
60b8cabd KS |
1372 | #endif |
1373 | ||
2ee97caf | 1374 | out: |
a2de48ca GKH |
1375 | put_device(dev); |
1376 | ||
a2de48ca | 1377 | kfree(new_class_name); |
952ab431 | 1378 | kfree(old_class_name); |
2ee97caf | 1379 | kfree(old_device_name); |
a2de48ca GKH |
1380 | |
1381 | return error; | |
1382 | } | |
a2807dbc | 1383 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1384 | |
1385 | static int device_move_class_links(struct device *dev, | |
1386 | struct device *old_parent, | |
1387 | struct device *new_parent) | |
1388 | { | |
f7f3461d | 1389 | int error = 0; |
8a82472f | 1390 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1391 | char *class_name; |
1392 | ||
1393 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1394 | if (!class_name) { | |
cb360bbf | 1395 | error = -ENOMEM; |
8a82472f CH |
1396 | goto out; |
1397 | } | |
1398 | if (old_parent) { | |
1399 | sysfs_remove_link(&dev->kobj, "device"); | |
1400 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1401 | } | |
c744aeae CH |
1402 | if (new_parent) { |
1403 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1404 | "device"); | |
1405 | if (error) | |
1406 | goto out; | |
1407 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1408 | class_name); | |
1409 | if (error) | |
1410 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1411 | } else |
c744aeae | 1412 | error = 0; |
8a82472f CH |
1413 | out: |
1414 | kfree(class_name); | |
1415 | return error; | |
1416 | #else | |
f7f3461d GKH |
1417 | if (old_parent) |
1418 | sysfs_remove_link(&dev->kobj, "device"); | |
1419 | if (new_parent) | |
1420 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1421 | "device"); | |
1422 | return error; | |
8a82472f CH |
1423 | #endif |
1424 | } | |
1425 | ||
1426 | /** | |
1427 | * device_move - moves a device to a new parent | |
1428 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1429 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1430 | */ |
1431 | int device_move(struct device *dev, struct device *new_parent) | |
1432 | { | |
1433 | int error; | |
1434 | struct device *old_parent; | |
c744aeae | 1435 | struct kobject *new_parent_kobj; |
8a82472f CH |
1436 | |
1437 | dev = get_device(dev); | |
1438 | if (!dev) | |
1439 | return -EINVAL; | |
1440 | ||
8a82472f | 1441 | new_parent = get_device(new_parent); |
4a3ad20c | 1442 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1443 | |
7dc72b28 | 1444 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
2b3a302a | 1445 | __func__, new_parent ? new_parent->bus_id : "<NULL>"); |
c744aeae | 1446 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1447 | if (error) { |
63b6971a | 1448 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1449 | put_device(new_parent); |
1450 | goto out; | |
1451 | } | |
1452 | old_parent = dev->parent; | |
1453 | dev->parent = new_parent; | |
1454 | if (old_parent) | |
acf02d23 | 1455 | klist_remove(&dev->knode_parent); |
0d358f22 | 1456 | if (new_parent) { |
c744aeae | 1457 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); |
0d358f22 YL |
1458 | set_dev_node(dev, dev_to_node(new_parent)); |
1459 | } | |
1460 | ||
8a82472f CH |
1461 | if (!dev->class) |
1462 | goto out_put; | |
1463 | error = device_move_class_links(dev, old_parent, new_parent); | |
1464 | if (error) { | |
1465 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1466 | device_move_class_links(dev, new_parent, old_parent); | |
1467 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1468 | if (new_parent) |
1469 | klist_remove(&dev->knode_parent); | |
0d358f22 YL |
1470 | dev->parent = old_parent; |
1471 | if (old_parent) { | |
8a82472f CH |
1472 | klist_add_tail(&dev->knode_parent, |
1473 | &old_parent->klist_children); | |
0d358f22 YL |
1474 | set_dev_node(dev, dev_to_node(old_parent)); |
1475 | } | |
8a82472f | 1476 | } |
63b6971a | 1477 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1478 | put_device(new_parent); |
1479 | goto out; | |
1480 | } | |
1481 | out_put: | |
1482 | put_device(old_parent); | |
1483 | out: | |
1484 | put_device(dev); | |
1485 | return error; | |
1486 | } | |
8a82472f | 1487 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1488 | |
1489 | /** | |
1490 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1491 | */ | |
1492 | void device_shutdown(void) | |
1493 | { | |
4a3ad20c | 1494 | struct device *dev, *devn; |
37b0c020 GKH |
1495 | |
1496 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1497 | kobj.entry) { | |
1498 | if (dev->bus && dev->bus->shutdown) { | |
1499 | dev_dbg(dev, "shutdown\n"); | |
1500 | dev->bus->shutdown(dev); | |
1501 | } else if (dev->driver && dev->driver->shutdown) { | |
1502 | dev_dbg(dev, "shutdown\n"); | |
1503 | dev->driver->shutdown(dev); | |
1504 | } | |
1505 | } | |
e105b8bf DW |
1506 | kobject_put(sysfs_dev_char_kobj); |
1507 | kobject_put(sysfs_dev_block_kobj); | |
1508 | kobject_put(dev_kobj); | |
37b0c020 | 1509 | } |