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> |
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 | */ | |
56 | const char *dev_driver_string(struct device *dev) | |
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); |
87348136 | 544 | set_dev_node(dev, -1); |
1da177e4 LT |
545 | } |
546 | ||
40fa5422 | 547 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
548 | static struct kobject *get_device_parent(struct device *dev, |
549 | struct device *parent) | |
40fa5422 | 550 | { |
da231fd5 | 551 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 552 | if (dev->class && (!parent || parent->class != dev->class)) |
1fbfee6c | 553 | return &dev->class->p->class_subsys.kobj; |
da231fd5 | 554 | /* all other devices keep their parent */ |
40fa5422 | 555 | else if (parent) |
c744aeae | 556 | return &parent->kobj; |
40fa5422 | 557 | |
c744aeae | 558 | return NULL; |
40fa5422 | 559 | } |
da231fd5 KS |
560 | |
561 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
562 | static inline void cleanup_glue_dir(struct device *dev, |
563 | struct kobject *glue_dir) {} | |
40fa5422 | 564 | #else |
86406245 | 565 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 566 | { |
86406245 | 567 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 568 | |
86406245 | 569 | if (!virtual_dir) |
4ff6abff | 570 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 571 | &devices_kset->kobj); |
f0ee61a6 | 572 | |
86406245 | 573 | return virtual_dir; |
f0ee61a6 GKH |
574 | } |
575 | ||
da231fd5 KS |
576 | static struct kobject *get_device_parent(struct device *dev, |
577 | struct device *parent) | |
40fa5422 | 578 | { |
43968d2f GKH |
579 | int retval; |
580 | ||
86406245 KS |
581 | if (dev->class) { |
582 | struct kobject *kobj = NULL; | |
583 | struct kobject *parent_kobj; | |
584 | struct kobject *k; | |
585 | ||
586 | /* | |
587 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
588 | * Class-devices with a non class-device as parent, live |
589 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
590 | */ |
591 | if (parent == NULL) | |
592 | parent_kobj = virtual_device_parent(dev); | |
593 | else if (parent->class) | |
594 | return &parent->kobj; | |
595 | else | |
596 | parent_kobj = &parent->kobj; | |
597 | ||
598 | /* find our class-directory at the parent and reference it */ | |
7c71448b GKH |
599 | spin_lock(&dev->class->p->class_dirs.list_lock); |
600 | list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) | |
86406245 KS |
601 | if (k->parent == parent_kobj) { |
602 | kobj = kobject_get(k); | |
603 | break; | |
604 | } | |
7c71448b | 605 | spin_unlock(&dev->class->p->class_dirs.list_lock); |
86406245 KS |
606 | if (kobj) |
607 | return kobj; | |
608 | ||
609 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
610 | k = kobject_create(); |
611 | if (!k) | |
612 | return NULL; | |
7c71448b | 613 | k->kset = &dev->class->p->class_dirs; |
b2d6db58 | 614 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f GKH |
615 | if (retval < 0) { |
616 | kobject_put(k); | |
617 | return NULL; | |
618 | } | |
0f4dafc0 | 619 | /* do not emit an uevent for this simple "glue" directory */ |
43968d2f | 620 | return k; |
86406245 KS |
621 | } |
622 | ||
623 | if (parent) | |
c744aeae CH |
624 | return &parent->kobj; |
625 | return NULL; | |
626 | } | |
da231fd5 | 627 | |
63b6971a | 628 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 629 | { |
0f4dafc0 | 630 | /* see if we live in a "glue" directory */ |
c1fe539a | 631 | if (!glue_dir || !dev->class || |
7c71448b | 632 | glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5 KS |
633 | return; |
634 | ||
0f4dafc0 | 635 | kobject_put(glue_dir); |
da231fd5 | 636 | } |
63b6971a CH |
637 | |
638 | static void cleanup_device_parent(struct device *dev) | |
639 | { | |
640 | cleanup_glue_dir(dev, dev->kobj.parent); | |
641 | } | |
c744aeae | 642 | #endif |
86406245 | 643 | |
63b6971a | 644 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
645 | { |
646 | struct kobject *kobj; | |
647 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
648 | if (kobj) |
649 | dev->kobj.parent = kobj; | |
40fa5422 | 650 | } |
40fa5422 | 651 | |
2ee97caf CH |
652 | static int device_add_class_symlinks(struct device *dev) |
653 | { | |
654 | int error; | |
655 | ||
656 | if (!dev->class) | |
657 | return 0; | |
da231fd5 | 658 | |
1fbfee6c GKH |
659 | error = sysfs_create_link(&dev->kobj, |
660 | &dev->class->p->class_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 */ | |
1fbfee6c | 667 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 668 | device_is_not_partition(dev)) { |
1fbfee6c | 669 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
7c71448b | 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: |
1fbfee6c | 707 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 708 | device_is_not_partition(dev)) |
1fbfee6c GKH |
709 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
710 | dev->bus_id); | |
da231fd5 KS |
711 | #else |
712 | /* link in the class directory pointing to the device */ | |
1fbfee6c GKH |
713 | error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
714 | &dev->kobj, dev->bus_id); | |
da231fd5 KS |
715 | if (error) |
716 | goto out_subsys; | |
717 | ||
4e886c29 | 718 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
719 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
720 | "device"); | |
721 | if (error) | |
722 | goto out_busid; | |
723 | } | |
724 | return 0; | |
725 | ||
726 | out_busid: | |
1fbfee6c | 727 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id); |
da231fd5 KS |
728 | #endif |
729 | ||
2ee97caf CH |
730 | out_subsys: |
731 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
732 | out: | |
733 | return error; | |
734 | } | |
735 | ||
736 | static void device_remove_class_symlinks(struct device *dev) | |
737 | { | |
738 | if (!dev->class) | |
739 | return; | |
da231fd5 | 740 | |
2ee97caf | 741 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 742 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
743 | char *class_name; |
744 | ||
745 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
746 | if (class_name) { | |
747 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
748 | kfree(class_name); | |
749 | } | |
2ee97caf CH |
750 | sysfs_remove_link(&dev->kobj, "device"); |
751 | } | |
da231fd5 | 752 | |
1fbfee6c | 753 | if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c29 | 754 | device_is_not_partition(dev)) |
1fbfee6c GKH |
755 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
756 | dev->bus_id); | |
da231fd5 | 757 | #else |
4e886c29 | 758 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
759 | sysfs_remove_link(&dev->kobj, "device"); |
760 | ||
1fbfee6c | 761 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev->bus_id); |
da231fd5 KS |
762 | #endif |
763 | ||
2ee97caf CH |
764 | sysfs_remove_link(&dev->kobj, "subsystem"); |
765 | } | |
766 | ||
413c239f SR |
767 | /** |
768 | * dev_set_name - set a device name | |
769 | * @dev: device | |
46232366 | 770 | * @fmt: format string for the device's name |
413c239f SR |
771 | */ |
772 | int dev_set_name(struct device *dev, const char *fmt, ...) | |
773 | { | |
774 | va_list vargs; | |
775 | ||
776 | va_start(vargs, fmt); | |
777 | vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs); | |
778 | va_end(vargs); | |
779 | return 0; | |
780 | } | |
781 | EXPORT_SYMBOL_GPL(dev_set_name); | |
782 | ||
e105b8bf DW |
783 | /** |
784 | * device_to_dev_kobj - select a /sys/dev/ directory for the device | |
785 | * @dev: device | |
786 | * | |
787 | * By default we select char/ for new entries. Setting class->dev_obj | |
788 | * to NULL prevents an entry from being created. class->dev_kobj must | |
789 | * be set (or cleared) before any devices are registered to the class | |
790 | * otherwise device_create_sys_dev_entry() and | |
791 | * device_remove_sys_dev_entry() will disagree about the the presence | |
792 | * of the link. | |
793 | */ | |
794 | static struct kobject *device_to_dev_kobj(struct device *dev) | |
795 | { | |
796 | struct kobject *kobj; | |
797 | ||
798 | if (dev->class) | |
799 | kobj = dev->class->dev_kobj; | |
800 | else | |
801 | kobj = sysfs_dev_char_kobj; | |
802 | ||
803 | return kobj; | |
804 | } | |
805 | ||
806 | static int device_create_sys_dev_entry(struct device *dev) | |
807 | { | |
808 | struct kobject *kobj = device_to_dev_kobj(dev); | |
809 | int error = 0; | |
810 | char devt_str[15]; | |
811 | ||
812 | if (kobj) { | |
813 | format_dev_t(devt_str, dev->devt); | |
814 | error = sysfs_create_link(kobj, &dev->kobj, devt_str); | |
815 | } | |
816 | ||
817 | return error; | |
818 | } | |
819 | ||
820 | static void device_remove_sys_dev_entry(struct device *dev) | |
821 | { | |
822 | struct kobject *kobj = device_to_dev_kobj(dev); | |
823 | char devt_str[15]; | |
824 | ||
825 | if (kobj) { | |
826 | format_dev_t(devt_str, dev->devt); | |
827 | sysfs_remove_link(kobj, devt_str); | |
828 | } | |
829 | } | |
830 | ||
1da177e4 | 831 | /** |
4a3ad20c GKH |
832 | * device_add - add device to device hierarchy. |
833 | * @dev: device. | |
1da177e4 | 834 | * |
4a3ad20c GKH |
835 | * This is part 2 of device_register(), though may be called |
836 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 837 | * |
4a3ad20c GKH |
838 | * This adds it to the kobject hierarchy via kobject_add(), adds it |
839 | * to the global and sibling lists for the device, then | |
840 | * adds it to the other relevant subsystems of the driver model. | |
1da177e4 LT |
841 | */ |
842 | int device_add(struct device *dev) | |
843 | { | |
844 | struct device *parent = NULL; | |
c47ed219 | 845 | struct class_interface *class_intf; |
775b64d2 RW |
846 | int error; |
847 | ||
1da177e4 | 848 | dev = get_device(dev); |
775b64d2 RW |
849 | if (!dev || !strlen(dev->bus_id)) { |
850 | error = -EINVAL; | |
c1fe539a | 851 | goto Done; |
775b64d2 | 852 | } |
1da177e4 | 853 | |
2b3a302a | 854 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
c205ef48 | 855 | |
1da177e4 | 856 | parent = get_device(dev->parent); |
63b6971a | 857 | setup_parent(dev, parent); |
1da177e4 | 858 | |
0d358f22 YL |
859 | /* use parent numa_node */ |
860 | if (parent) | |
861 | set_dev_node(dev, dev_to_node(parent)); | |
862 | ||
1da177e4 | 863 | /* first, register with generic layer. */ |
b2d6db58 | 864 | error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
40fa5422 | 865 | if (error) |
1da177e4 | 866 | goto Error; |
a7fd6706 | 867 | |
37022644 BW |
868 | /* notify platform of device entry */ |
869 | if (platform_notify) | |
870 | platform_notify(dev); | |
871 | ||
116af378 BH |
872 | /* notify clients of device entry (new way) */ |
873 | if (dev->bus) | |
c6f7e72a | 874 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
875 | BUS_NOTIFY_ADD_DEVICE, dev); |
876 | ||
ad6a1e1c | 877 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
878 | if (error) |
879 | goto attrError; | |
a7fd6706 | 880 | |
23681e47 | 881 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
882 | error = device_create_file(dev, &devt_attr); |
883 | if (error) | |
a306eea4 | 884 | goto ueventattrError; |
e105b8bf DW |
885 | |
886 | error = device_create_sys_dev_entry(dev); | |
887 | if (error) | |
888 | goto devtattrError; | |
23681e47 GKH |
889 | } |
890 | ||
2ee97caf CH |
891 | error = device_add_class_symlinks(dev); |
892 | if (error) | |
893 | goto SymlinkError; | |
dc0afa83 CH |
894 | error = device_add_attrs(dev); |
895 | if (error) | |
2620efef | 896 | goto AttrsError; |
dc0afa83 CH |
897 | error = bus_add_device(dev); |
898 | if (error) | |
1da177e4 | 899 | goto BusError; |
57eee3d2 RW |
900 | error = device_pm_add(dev); |
901 | if (error) | |
902 | goto PMError; | |
83b5fb4c | 903 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 904 | bus_attach_device(dev); |
1da177e4 | 905 | if (parent) |
d856f1e3 | 906 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 907 | |
5d9fd169 | 908 | if (dev->class) { |
f75b1c60 | 909 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 910 | /* tie the class to the device */ |
97ae69fd | 911 | list_add_tail(&dev->node, &dev->class->p->class_devices); |
c47ed219 GKH |
912 | |
913 | /* notify any interfaces that the device is here */ | |
184f1f77 GKH |
914 | list_for_each_entry(class_intf, |
915 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
916 | if (class_intf->add_dev) |
917 | class_intf->add_dev(dev, class_intf); | |
f75b1c60 | 918 | mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169 | 919 | } |
1da177e4 LT |
920 | Done: |
921 | put_device(dev); | |
922 | return error; | |
1da177e4 | 923 | PMError: |
57eee3d2 RW |
924 | bus_remove_device(dev); |
925 | BusError: | |
116af378 | 926 | if (dev->bus) |
c6f7e72a | 927 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 928 | BUS_NOTIFY_DEL_DEVICE, dev); |
82f0cf9b | 929 | device_remove_attrs(dev); |
2620efef | 930 | AttrsError: |
2ee97caf CH |
931 | device_remove_class_symlinks(dev); |
932 | SymlinkError: | |
e105b8bf DW |
933 | if (MAJOR(dev->devt)) |
934 | device_remove_sys_dev_entry(dev); | |
935 | devtattrError: | |
ad6a1e1c TH |
936 | if (MAJOR(dev->devt)) |
937 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 938 | ueventattrError: |
ad6a1e1c | 939 | device_remove_file(dev, &uevent_attr); |
23681e47 | 940 | attrError: |
312c004d | 941 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
942 | kobject_del(&dev->kobj); |
943 | Error: | |
63b6971a | 944 | cleanup_device_parent(dev); |
1da177e4 LT |
945 | if (parent) |
946 | put_device(parent); | |
947 | goto Done; | |
948 | } | |
949 | ||
1da177e4 | 950 | /** |
4a3ad20c GKH |
951 | * device_register - register a device with the system. |
952 | * @dev: pointer to the device structure | |
1da177e4 | 953 | * |
4a3ad20c GKH |
954 | * This happens in two clean steps - initialize the device |
955 | * and add it to the system. The two steps can be called | |
956 | * separately, but this is the easiest and most common. | |
957 | * I.e. you should only call the two helpers separately if | |
958 | * have a clearly defined need to use and refcount the device | |
959 | * before it is added to the hierarchy. | |
1da177e4 | 960 | */ |
1da177e4 LT |
961 | int device_register(struct device *dev) |
962 | { | |
963 | device_initialize(dev); | |
964 | return device_add(dev); | |
965 | } | |
966 | ||
1da177e4 | 967 | /** |
4a3ad20c GKH |
968 | * get_device - increment reference count for device. |
969 | * @dev: device. | |
1da177e4 | 970 | * |
4a3ad20c GKH |
971 | * This simply forwards the call to kobject_get(), though |
972 | * we do take care to provide for the case that we get a NULL | |
973 | * pointer passed in. | |
1da177e4 | 974 | */ |
4a3ad20c | 975 | struct device *get_device(struct device *dev) |
1da177e4 LT |
976 | { |
977 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
978 | } | |
979 | ||
1da177e4 | 980 | /** |
4a3ad20c GKH |
981 | * put_device - decrement reference count. |
982 | * @dev: device in question. | |
1da177e4 | 983 | */ |
4a3ad20c | 984 | void put_device(struct device *dev) |
1da177e4 | 985 | { |
edfaa7c3 | 986 | /* might_sleep(); */ |
1da177e4 LT |
987 | if (dev) |
988 | kobject_put(&dev->kobj); | |
989 | } | |
990 | ||
1da177e4 | 991 | /** |
4a3ad20c GKH |
992 | * device_del - delete device from system. |
993 | * @dev: device. | |
1da177e4 | 994 | * |
4a3ad20c GKH |
995 | * This is the first part of the device unregistration |
996 | * sequence. This removes the device from the lists we control | |
997 | * from here, has it removed from the other driver model | |
998 | * subsystems it was added to in device_add(), and removes it | |
999 | * from the kobject hierarchy. | |
1da177e4 | 1000 | * |
4a3ad20c GKH |
1001 | * NOTE: this should be called manually _iff_ device_add() was |
1002 | * also called manually. | |
1da177e4 | 1003 | */ |
4a3ad20c | 1004 | void device_del(struct device *dev) |
1da177e4 | 1005 | { |
4a3ad20c | 1006 | struct device *parent = dev->parent; |
c47ed219 | 1007 | struct class_interface *class_intf; |
1da177e4 | 1008 | |
775b64d2 | 1009 | device_pm_remove(dev); |
1da177e4 | 1010 | if (parent) |
d62c0f9f | 1011 | klist_del(&dev->knode_parent); |
e105b8bf DW |
1012 | if (MAJOR(dev->devt)) { |
1013 | device_remove_sys_dev_entry(dev); | |
ad6a1e1c | 1014 | device_remove_file(dev, &devt_attr); |
e105b8bf | 1015 | } |
b9d9c82b | 1016 | if (dev->class) { |
da231fd5 | 1017 | device_remove_class_symlinks(dev); |
99ef3ef8 | 1018 | |
f75b1c60 | 1019 | mutex_lock(&dev->class->p->class_mutex); |
c47ed219 | 1020 | /* notify any interfaces that the device is now gone */ |
184f1f77 GKH |
1021 | list_for_each_entry(class_intf, |
1022 | &dev->class->p->class_interfaces, node) | |
c47ed219 GKH |
1023 | if (class_intf->remove_dev) |
1024 | class_intf->remove_dev(dev, class_intf); | |
1025 | /* remove the device from the class list */ | |
5d9fd169 | 1026 | list_del_init(&dev->node); |
f75b1c60 | 1027 | mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b | 1028 | } |
ad6a1e1c | 1029 | device_remove_file(dev, &uevent_attr); |
2620efef | 1030 | device_remove_attrs(dev); |
28953533 | 1031 | bus_remove_device(dev); |
1da177e4 | 1032 | |
2f8d16a9 TH |
1033 | /* |
1034 | * Some platform devices are driven without driver attached | |
1035 | * and managed resources may have been acquired. Make sure | |
1036 | * all resources are released. | |
1037 | */ | |
1038 | devres_release_all(dev); | |
1039 | ||
1da177e4 LT |
1040 | /* Notify the platform of the removal, in case they |
1041 | * need to do anything... | |
1042 | */ | |
1043 | if (platform_notify_remove) | |
1044 | platform_notify_remove(dev); | |
116af378 | 1045 | if (dev->bus) |
c6f7e72a | 1046 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 1047 | BUS_NOTIFY_DEL_DEVICE, dev); |
312c004d | 1048 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 1049 | cleanup_device_parent(dev); |
1da177e4 | 1050 | kobject_del(&dev->kobj); |
da231fd5 | 1051 | put_device(parent); |
1da177e4 LT |
1052 | } |
1053 | ||
1054 | /** | |
4a3ad20c GKH |
1055 | * device_unregister - unregister device from system. |
1056 | * @dev: device going away. | |
1da177e4 | 1057 | * |
4a3ad20c GKH |
1058 | * We do this in two parts, like we do device_register(). First, |
1059 | * we remove it from all the subsystems with device_del(), then | |
1060 | * we decrement the reference count via put_device(). If that | |
1061 | * is the final reference count, the device will be cleaned up | |
1062 | * via device_release() above. Otherwise, the structure will | |
1063 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 1064 | */ |
4a3ad20c | 1065 | void device_unregister(struct device *dev) |
1da177e4 | 1066 | { |
2b3a302a | 1067 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
1da177e4 LT |
1068 | device_del(dev); |
1069 | put_device(dev); | |
1070 | } | |
1071 | ||
4a3ad20c | 1072 | static struct device *next_device(struct klist_iter *i) |
36239577 | 1073 | { |
4a3ad20c | 1074 | struct klist_node *n = klist_next(i); |
36239577 | 1075 | return n ? container_of(n, struct device, knode_parent) : NULL; |
1076 | } | |
1077 | ||
1da177e4 | 1078 | /** |
4a3ad20c GKH |
1079 | * device_for_each_child - device child iterator. |
1080 | * @parent: parent struct device. | |
1081 | * @data: data for the callback. | |
1082 | * @fn: function to be called for each device. | |
1da177e4 | 1083 | * |
4a3ad20c GKH |
1084 | * Iterate over @parent's child devices, and call @fn for each, |
1085 | * passing it @data. | |
1da177e4 | 1086 | * |
4a3ad20c GKH |
1087 | * We check the return of @fn each time. If it returns anything |
1088 | * other than 0, we break out and return that value. | |
1da177e4 | 1089 | */ |
4a3ad20c GKH |
1090 | int device_for_each_child(struct device *parent, void *data, |
1091 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1092 | { |
36239577 | 1093 | struct klist_iter i; |
4a3ad20c | 1094 | struct device *child; |
1da177e4 LT |
1095 | int error = 0; |
1096 | ||
36239577 | 1097 | klist_iter_init(&parent->klist_children, &i); |
1098 | while ((child = next_device(&i)) && !error) | |
1099 | error = fn(child, data); | |
1100 | klist_iter_exit(&i); | |
1da177e4 LT |
1101 | return error; |
1102 | } | |
1103 | ||
5ab69981 CH |
1104 | /** |
1105 | * device_find_child - device iterator for locating a particular device. | |
1106 | * @parent: parent struct device | |
1107 | * @data: Data to pass to match function | |
1108 | * @match: Callback function to check device | |
1109 | * | |
1110 | * This is similar to the device_for_each_child() function above, but it | |
1111 | * returns a reference to a device that is 'found' for later use, as | |
1112 | * determined by the @match callback. | |
1113 | * | |
1114 | * The callback should return 0 if the device doesn't match and non-zero | |
1115 | * if it does. If the callback returns non-zero and a reference to the | |
1116 | * current device can be obtained, this function will return to the caller | |
1117 | * and not iterate over any more devices. | |
1118 | */ | |
4a3ad20c GKH |
1119 | struct device *device_find_child(struct device *parent, void *data, |
1120 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1121 | { |
1122 | struct klist_iter i; | |
1123 | struct device *child; | |
1124 | ||
1125 | if (!parent) | |
1126 | return NULL; | |
1127 | ||
1128 | klist_iter_init(&parent->klist_children, &i); | |
1129 | while ((child = next_device(&i))) | |
1130 | if (match(child, data) && get_device(child)) | |
1131 | break; | |
1132 | klist_iter_exit(&i); | |
1133 | return child; | |
1134 | } | |
1135 | ||
1da177e4 LT |
1136 | int __init devices_init(void) |
1137 | { | |
881c6cfd GKH |
1138 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1139 | if (!devices_kset) | |
1140 | return -ENOMEM; | |
e105b8bf DW |
1141 | dev_kobj = kobject_create_and_add("dev", NULL); |
1142 | if (!dev_kobj) | |
1143 | goto dev_kobj_err; | |
1144 | sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); | |
1145 | if (!sysfs_dev_block_kobj) | |
1146 | goto block_kobj_err; | |
1147 | sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); | |
1148 | if (!sysfs_dev_char_kobj) | |
1149 | goto char_kobj_err; | |
1150 | ||
881c6cfd | 1151 | return 0; |
e105b8bf DW |
1152 | |
1153 | char_kobj_err: | |
1154 | kobject_put(sysfs_dev_block_kobj); | |
1155 | block_kobj_err: | |
1156 | kobject_put(dev_kobj); | |
1157 | dev_kobj_err: | |
1158 | kset_unregister(devices_kset); | |
1159 | return -ENOMEM; | |
1da177e4 LT |
1160 | } |
1161 | ||
1162 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1163 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1164 | |
1165 | EXPORT_SYMBOL_GPL(device_initialize); | |
1166 | EXPORT_SYMBOL_GPL(device_add); | |
1167 | EXPORT_SYMBOL_GPL(device_register); | |
1168 | ||
1169 | EXPORT_SYMBOL_GPL(device_del); | |
1170 | EXPORT_SYMBOL_GPL(device_unregister); | |
1171 | EXPORT_SYMBOL_GPL(get_device); | |
1172 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1173 | |
1174 | EXPORT_SYMBOL_GPL(device_create_file); | |
1175 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1176 | |
1177 | ||
1178 | static void device_create_release(struct device *dev) | |
1179 | { | |
2b3a302a | 1180 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
23681e47 GKH |
1181 | kfree(dev); |
1182 | } | |
1183 | ||
1184 | /** | |
8882b394 | 1185 | * device_create_vargs - creates a device and registers it with sysfs |
42734daf HK |
1186 | * @class: pointer to the struct class that this device should be registered to |
1187 | * @parent: pointer to the parent struct device of this new device, if any | |
1188 | * @devt: the dev_t for the char device to be added | |
8882b394 | 1189 | * @drvdata: the data to be added to the device for callbacks |
42734daf | 1190 | * @fmt: string for the device's name |
8882b394 | 1191 | * @args: va_list for the device's name |
42734daf HK |
1192 | * |
1193 | * This function can be used by char device classes. A struct device | |
1194 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1195 | * |
23681e47 GKH |
1196 | * A "dev" file will be created, showing the dev_t for the device, if |
1197 | * the dev_t is not 0,0. | |
42734daf HK |
1198 | * If a pointer to a parent struct device is passed in, the newly created |
1199 | * struct device will be a child of that device in sysfs. | |
1200 | * The pointer to the struct device will be returned from the call. | |
1201 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1202 | * pointer. |
1203 | * | |
1204 | * Note: the struct class passed to this function must have previously | |
1205 | * been created with a call to class_create(). | |
1206 | */ | |
8882b394 GKH |
1207 | struct device *device_create_vargs(struct class *class, struct device *parent, |
1208 | dev_t devt, void *drvdata, const char *fmt, | |
1209 | va_list args) | |
23681e47 | 1210 | { |
23681e47 GKH |
1211 | struct device *dev = NULL; |
1212 | int retval = -ENODEV; | |
1213 | ||
1214 | if (class == NULL || IS_ERR(class)) | |
1215 | goto error; | |
23681e47 GKH |
1216 | |
1217 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1218 | if (!dev) { | |
1219 | retval = -ENOMEM; | |
1220 | goto error; | |
1221 | } | |
1222 | ||
1223 | dev->devt = devt; | |
1224 | dev->class = class; | |
1225 | dev->parent = parent; | |
1226 | dev->release = device_create_release; | |
8882b394 | 1227 | dev_set_drvdata(dev, drvdata); |
23681e47 | 1228 | |
23681e47 | 1229 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); |
23681e47 GKH |
1230 | retval = device_register(dev); |
1231 | if (retval) | |
1232 | goto error; | |
1233 | ||
23681e47 GKH |
1234 | return dev; |
1235 | ||
1236 | error: | |
1237 | kfree(dev); | |
1238 | return ERR_PTR(retval); | |
1239 | } | |
8882b394 GKH |
1240 | EXPORT_SYMBOL_GPL(device_create_vargs); |
1241 | ||
1242 | /** | |
4e106739 | 1243 | * device_create - creates a device and registers it with sysfs |
8882b394 GKH |
1244 | * @class: pointer to the struct class that this device should be registered to |
1245 | * @parent: pointer to the parent struct device of this new device, if any | |
1246 | * @devt: the dev_t for the char device to be added | |
1247 | * @drvdata: the data to be added to the device for callbacks | |
1248 | * @fmt: string for the device's name | |
1249 | * | |
1250 | * This function can be used by char device classes. A struct device | |
1251 | * will be created in sysfs, registered to the specified class. | |
1252 | * | |
1253 | * A "dev" file will be created, showing the dev_t for the device, if | |
1254 | * the dev_t is not 0,0. | |
1255 | * If a pointer to a parent struct device is passed in, the newly created | |
1256 | * struct device will be a child of that device in sysfs. | |
1257 | * The pointer to the struct device will be returned from the call. | |
1258 | * Any further sysfs files that might be required can be created using this | |
1259 | * pointer. | |
1260 | * | |
1261 | * Note: the struct class passed to this function must have previously | |
1262 | * been created with a call to class_create(). | |
1263 | */ | |
4e106739 GKH |
1264 | struct device *device_create(struct class *class, struct device *parent, |
1265 | dev_t devt, void *drvdata, const char *fmt, ...) | |
8882b394 GKH |
1266 | { |
1267 | va_list vargs; | |
1268 | struct device *dev; | |
1269 | ||
1270 | va_start(vargs, fmt); | |
1271 | dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); | |
1272 | va_end(vargs); | |
1273 | return dev; | |
1274 | } | |
4e106739 | 1275 | EXPORT_SYMBOL_GPL(device_create); |
8882b394 | 1276 | |
cd35449b | 1277 | static int __match_devt(struct device *dev, void *data) |
23681e47 | 1278 | { |
cd35449b | 1279 | dev_t *devt = data; |
23681e47 | 1280 | |
cd35449b | 1281 | return dev->devt == *devt; |
775b64d2 RW |
1282 | } |
1283 | ||
1284 | /** | |
1285 | * device_destroy - removes a device that was created with device_create() | |
1286 | * @class: pointer to the struct class that this device was registered with | |
1287 | * @devt: the dev_t of the device that was previously registered | |
1288 | * | |
1289 | * This call unregisters and cleans up a device that was created with a | |
1290 | * call to device_create(). | |
1291 | */ | |
1292 | void device_destroy(struct class *class, dev_t devt) | |
1293 | { | |
1294 | struct device *dev; | |
23681e47 | 1295 | |
695794ae | 1296 | dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b DY |
1297 | if (dev) { |
1298 | put_device(dev); | |
23681e47 | 1299 | device_unregister(dev); |
cd35449b | 1300 | } |
23681e47 GKH |
1301 | } |
1302 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca GKH |
1303 | |
1304 | /** | |
1305 | * device_rename - renames a device | |
1306 | * @dev: the pointer to the struct device to be renamed | |
1307 | * @new_name: the new name of the device | |
1308 | */ | |
1309 | int device_rename(struct device *dev, char *new_name) | |
1310 | { | |
1311 | char *old_class_name = NULL; | |
1312 | char *new_class_name = NULL; | |
2ee97caf | 1313 | char *old_device_name = NULL; |
a2de48ca GKH |
1314 | int error; |
1315 | ||
1316 | dev = get_device(dev); | |
1317 | if (!dev) | |
1318 | return -EINVAL; | |
1319 | ||
7dc72b28 | 1320 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
2b3a302a | 1321 | __func__, new_name); |
a2de48ca | 1322 | |
99ef3ef8 | 1323 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1324 | if ((dev->class) && (dev->parent)) |
1325 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1326 | #endif |
a2de48ca | 1327 | |
2ee97caf CH |
1328 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1329 | if (!old_device_name) { | |
1330 | error = -ENOMEM; | |
1331 | goto out; | |
a2de48ca | 1332 | } |
2ee97caf | 1333 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1334 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1335 | ||
1336 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1337 | if (error) { |
1338 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1339 | goto out; | |
1340 | } | |
a2de48ca | 1341 | |
99ef3ef8 | 1342 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1343 | if (old_class_name) { |
1344 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1345 | if (new_class_name) { | |
36ce6dad CH |
1346 | error = sysfs_create_link_nowarn(&dev->parent->kobj, |
1347 | &dev->kobj, | |
1348 | new_class_name); | |
2ee97caf CH |
1349 | if (error) |
1350 | goto out; | |
a2de48ca GKH |
1351 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1352 | } | |
1353 | } | |
60b8cabd | 1354 | #else |
a2de48ca | 1355 | if (dev->class) { |
36ce6dad CH |
1356 | error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, |
1357 | &dev->kobj, dev->bus_id); | |
0599ad53 SH |
1358 | if (error) |
1359 | goto out; | |
1fbfee6c | 1360 | sysfs_remove_link(&dev->class->p->class_subsys.kobj, |
7c71448b | 1361 | old_device_name); |
a2de48ca | 1362 | } |
60b8cabd KS |
1363 | #endif |
1364 | ||
2ee97caf | 1365 | out: |
a2de48ca GKH |
1366 | put_device(dev); |
1367 | ||
a2de48ca | 1368 | kfree(new_class_name); |
952ab431 | 1369 | kfree(old_class_name); |
2ee97caf | 1370 | kfree(old_device_name); |
a2de48ca GKH |
1371 | |
1372 | return error; | |
1373 | } | |
a2807dbc | 1374 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1375 | |
1376 | static int device_move_class_links(struct device *dev, | |
1377 | struct device *old_parent, | |
1378 | struct device *new_parent) | |
1379 | { | |
f7f3461d | 1380 | int error = 0; |
8a82472f | 1381 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1382 | char *class_name; |
1383 | ||
1384 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1385 | if (!class_name) { | |
cb360bbf | 1386 | error = -ENOMEM; |
8a82472f CH |
1387 | goto out; |
1388 | } | |
1389 | if (old_parent) { | |
1390 | sysfs_remove_link(&dev->kobj, "device"); | |
1391 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1392 | } | |
c744aeae CH |
1393 | if (new_parent) { |
1394 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1395 | "device"); | |
1396 | if (error) | |
1397 | goto out; | |
1398 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1399 | class_name); | |
1400 | if (error) | |
1401 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1402 | } else |
c744aeae | 1403 | error = 0; |
8a82472f CH |
1404 | out: |
1405 | kfree(class_name); | |
1406 | return error; | |
1407 | #else | |
f7f3461d GKH |
1408 | if (old_parent) |
1409 | sysfs_remove_link(&dev->kobj, "device"); | |
1410 | if (new_parent) | |
1411 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1412 | "device"); | |
1413 | return error; | |
8a82472f CH |
1414 | #endif |
1415 | } | |
1416 | ||
1417 | /** | |
1418 | * device_move - moves a device to a new parent | |
1419 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1420 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1421 | */ |
1422 | int device_move(struct device *dev, struct device *new_parent) | |
1423 | { | |
1424 | int error; | |
1425 | struct device *old_parent; | |
c744aeae | 1426 | struct kobject *new_parent_kobj; |
8a82472f CH |
1427 | |
1428 | dev = get_device(dev); | |
1429 | if (!dev) | |
1430 | return -EINVAL; | |
1431 | ||
8a82472f | 1432 | new_parent = get_device(new_parent); |
4a3ad20c | 1433 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1434 | |
7dc72b28 | 1435 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
2b3a302a | 1436 | __func__, new_parent ? new_parent->bus_id : "<NULL>"); |
c744aeae | 1437 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1438 | if (error) { |
63b6971a | 1439 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1440 | put_device(new_parent); |
1441 | goto out; | |
1442 | } | |
1443 | old_parent = dev->parent; | |
1444 | dev->parent = new_parent; | |
1445 | if (old_parent) | |
acf02d23 | 1446 | klist_remove(&dev->knode_parent); |
0d358f22 | 1447 | if (new_parent) { |
c744aeae | 1448 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); |
0d358f22 YL |
1449 | set_dev_node(dev, dev_to_node(new_parent)); |
1450 | } | |
1451 | ||
8a82472f CH |
1452 | if (!dev->class) |
1453 | goto out_put; | |
1454 | error = device_move_class_links(dev, old_parent, new_parent); | |
1455 | if (error) { | |
1456 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1457 | device_move_class_links(dev, new_parent, old_parent); | |
1458 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1459 | if (new_parent) |
1460 | klist_remove(&dev->knode_parent); | |
0d358f22 YL |
1461 | dev->parent = old_parent; |
1462 | if (old_parent) { | |
8a82472f CH |
1463 | klist_add_tail(&dev->knode_parent, |
1464 | &old_parent->klist_children); | |
0d358f22 YL |
1465 | set_dev_node(dev, dev_to_node(old_parent)); |
1466 | } | |
8a82472f | 1467 | } |
63b6971a | 1468 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1469 | put_device(new_parent); |
1470 | goto out; | |
1471 | } | |
1472 | out_put: | |
1473 | put_device(old_parent); | |
1474 | out: | |
1475 | put_device(dev); | |
1476 | return error; | |
1477 | } | |
8a82472f | 1478 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1479 | |
1480 | /** | |
1481 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1482 | */ | |
1483 | void device_shutdown(void) | |
1484 | { | |
4a3ad20c | 1485 | struct device *dev, *devn; |
37b0c020 GKH |
1486 | |
1487 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1488 | kobj.entry) { | |
1489 | if (dev->bus && dev->bus->shutdown) { | |
1490 | dev_dbg(dev, "shutdown\n"); | |
1491 | dev->bus->shutdown(dev); | |
1492 | } else if (dev->driver && dev->driver->shutdown) { | |
1493 | dev_dbg(dev, "shutdown\n"); | |
1494 | dev->driver->shutdown(dev); | |
1495 | } | |
1496 | } | |
e105b8bf DW |
1497 | kobject_put(sysfs_dev_char_kobj); |
1498 | kobject_put(sysfs_dev_block_kobj); | |
1499 | kobject_put(dev_kobj); | |
37b0c020 | 1500 | } |