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> |
1da177e4 LT |
22 | #include <asm/semaphore.h> |
23 | ||
24 | #include "base.h" | |
25 | #include "power/power.h" | |
26 | ||
4a3ad20c GKH |
27 | int (*platform_notify)(struct device *dev) = NULL; |
28 | int (*platform_notify_remove)(struct device *dev) = NULL; | |
1da177e4 LT |
29 | |
30 | /* | |
31 | * sysfs bindings for devices. | |
32 | */ | |
33 | ||
3e95637a AS |
34 | /** |
35 | * dev_driver_string - Return a device's driver name, if at all possible | |
36 | * @dev: struct device to get the name of | |
37 | * | |
38 | * Will return the device's driver's name if it is bound to a device. If | |
39 | * the device is not bound to a device, it will return the name of the bus | |
40 | * it is attached to. If it is not attached to a bus either, an empty | |
41 | * string will be returned. | |
42 | */ | |
43 | const char *dev_driver_string(struct device *dev) | |
44 | { | |
45 | return dev->driver ? dev->driver->name : | |
a456b702 JD |
46 | (dev->bus ? dev->bus->name : |
47 | (dev->class ? dev->class->name : "")); | |
3e95637a | 48 | } |
310a922d | 49 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 50 | |
1da177e4 LT |
51 | #define to_dev(obj) container_of(obj, struct device, kobj) |
52 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
53 | ||
4a3ad20c GKH |
54 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
55 | char *buf) | |
1da177e4 | 56 | { |
4a3ad20c GKH |
57 | struct device_attribute *dev_attr = to_dev_attr(attr); |
58 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 59 | ssize_t ret = -EIO; |
1da177e4 LT |
60 | |
61 | if (dev_attr->show) | |
54b6f35c | 62 | ret = dev_attr->show(dev, dev_attr, buf); |
1da177e4 LT |
63 | return ret; |
64 | } | |
65 | ||
4a3ad20c GKH |
66 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
67 | const char *buf, size_t count) | |
1da177e4 | 68 | { |
4a3ad20c GKH |
69 | struct device_attribute *dev_attr = to_dev_attr(attr); |
70 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 71 | ssize_t ret = -EIO; |
1da177e4 LT |
72 | |
73 | if (dev_attr->store) | |
54b6f35c | 74 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
75 | return ret; |
76 | } | |
77 | ||
78 | static struct sysfs_ops dev_sysfs_ops = { | |
79 | .show = dev_attr_show, | |
80 | .store = dev_attr_store, | |
81 | }; | |
82 | ||
83 | ||
84 | /** | |
85 | * device_release - free device structure. | |
86 | * @kobj: device's kobject. | |
87 | * | |
88 | * This is called once the reference count for the object | |
89 | * reaches 0. We forward the call to the device's release | |
90 | * method, which should handle actually freeing the structure. | |
91 | */ | |
4a3ad20c | 92 | static void device_release(struct kobject *kobj) |
1da177e4 | 93 | { |
4a3ad20c | 94 | struct device *dev = to_dev(kobj); |
1da177e4 LT |
95 | |
96 | if (dev->release) | |
97 | dev->release(dev); | |
f9f852df KS |
98 | else if (dev->type && dev->type->release) |
99 | dev->type->release(dev); | |
2620efef GKH |
100 | else if (dev->class && dev->class->dev_release) |
101 | dev->class->dev_release(dev); | |
1da177e4 | 102 | else { |
4a3ad20c GKH |
103 | printk(KERN_ERR "Device '%s' does not have a release() " |
104 | "function, it is broken and must be fixed.\n", | |
1da177e4 LT |
105 | dev->bus_id); |
106 | WARN_ON(1); | |
107 | } | |
108 | } | |
109 | ||
8f4afc41 | 110 | static struct kobj_type device_ktype = { |
1da177e4 LT |
111 | .release = device_release, |
112 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
113 | }; |
114 | ||
115 | ||
312c004d | 116 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
117 | { |
118 | struct kobj_type *ktype = get_ktype(kobj); | |
119 | ||
8f4afc41 | 120 | if (ktype == &device_ktype) { |
1da177e4 | 121 | struct device *dev = to_dev(kobj); |
83b5fb4c CH |
122 | if (dev->uevent_suppress) |
123 | return 0; | |
1da177e4 LT |
124 | if (dev->bus) |
125 | return 1; | |
23681e47 GKH |
126 | if (dev->class) |
127 | return 1; | |
1da177e4 LT |
128 | } |
129 | return 0; | |
130 | } | |
131 | ||
312c004d | 132 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
133 | { |
134 | struct device *dev = to_dev(kobj); | |
135 | ||
23681e47 GKH |
136 | if (dev->bus) |
137 | return dev->bus->name; | |
138 | if (dev->class) | |
139 | return dev->class->name; | |
140 | return NULL; | |
1da177e4 LT |
141 | } |
142 | ||
7eff2e7a KS |
143 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
144 | struct kobj_uevent_env *env) | |
1da177e4 LT |
145 | { |
146 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
147 | int retval = 0; |
148 | ||
23681e47 GKH |
149 | /* add the major/minor if present */ |
150 | if (MAJOR(dev->devt)) { | |
7eff2e7a KS |
151 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
152 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
23681e47 GKH |
153 | } |
154 | ||
414264f9 | 155 | if (dev->type && dev->type->name) |
7eff2e7a | 156 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 157 | |
239378f1 | 158 | if (dev->driver) |
7eff2e7a | 159 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 160 | |
a87cb2ac | 161 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
162 | if (dev->class) { |
163 | struct device *parent = dev->parent; | |
164 | ||
165 | /* find first bus device in parent chain */ | |
166 | while (parent && !parent->bus) | |
167 | parent = parent->parent; | |
168 | if (parent && parent->bus) { | |
169 | const char *path; | |
170 | ||
171 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 172 | if (path) { |
7eff2e7a | 173 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
174 | kfree(path); |
175 | } | |
239378f1 | 176 | |
7eff2e7a | 177 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
178 | |
179 | if (parent->driver) | |
7eff2e7a KS |
180 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
181 | parent->driver->name); | |
239378f1 KS |
182 | } |
183 | } else if (dev->bus) { | |
7eff2e7a | 184 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
185 | |
186 | if (dev->driver) | |
4a3ad20c GKH |
187 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
188 | dev->driver->name); | |
d81d9d6b | 189 | } |
239378f1 | 190 | #endif |
1da177e4 | 191 | |
7eff2e7a | 192 | /* have the bus specific function add its stuff */ |
312c004d | 193 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 194 | retval = dev->bus->uevent(dev, env); |
f9f852df | 195 | if (retval) |
7dc72b28 GKH |
196 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
197 | dev->bus_id, __FUNCTION__, retval); | |
1da177e4 LT |
198 | } |
199 | ||
7eff2e7a | 200 | /* have the class specific function add its stuff */ |
2620efef | 201 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 202 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 203 | if (retval) |
7dc72b28 GKH |
204 | pr_debug("device: '%s': %s: class uevent() " |
205 | "returned %d\n", dev->bus_id, | |
f9f852df KS |
206 | __FUNCTION__, retval); |
207 | } | |
208 | ||
7eff2e7a | 209 | /* have the device type specific fuction add its stuff */ |
f9f852df | 210 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 211 | retval = dev->type->uevent(dev, env); |
f9f852df | 212 | if (retval) |
7dc72b28 GKH |
213 | pr_debug("device: '%s': %s: dev_type uevent() " |
214 | "returned %d\n", dev->bus_id, | |
f9f852df | 215 | __FUNCTION__, retval); |
2620efef GKH |
216 | } |
217 | ||
1da177e4 LT |
218 | return retval; |
219 | } | |
220 | ||
312c004d KS |
221 | static struct kset_uevent_ops device_uevent_ops = { |
222 | .filter = dev_uevent_filter, | |
223 | .name = dev_uevent_name, | |
224 | .uevent = dev_uevent, | |
1da177e4 LT |
225 | }; |
226 | ||
16574dcc KS |
227 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
228 | char *buf) | |
229 | { | |
230 | struct kobject *top_kobj; | |
231 | struct kset *kset; | |
7eff2e7a | 232 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
233 | int i; |
234 | size_t count = 0; | |
235 | int retval; | |
236 | ||
237 | /* search the kset, the device belongs to */ | |
238 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
239 | while (!top_kobj->kset && top_kobj->parent) |
240 | top_kobj = top_kobj->parent; | |
16574dcc KS |
241 | if (!top_kobj->kset) |
242 | goto out; | |
5c5daf65 | 243 | |
16574dcc KS |
244 | kset = top_kobj->kset; |
245 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
246 | goto out; | |
247 | ||
248 | /* respect filter */ | |
249 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
250 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
251 | goto out; | |
252 | ||
7eff2e7a KS |
253 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
254 | if (!env) | |
c7308c81 GKH |
255 | return -ENOMEM; |
256 | ||
16574dcc | 257 | /* let the kset specific function add its keys */ |
7eff2e7a | 258 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
259 | if (retval) |
260 | goto out; | |
261 | ||
262 | /* copy keys to file */ | |
7eff2e7a KS |
263 | for (i = 0; i < env->envp_idx; i++) |
264 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 265 | out: |
7eff2e7a | 266 | kfree(env); |
16574dcc KS |
267 | return count; |
268 | } | |
269 | ||
a7fd6706 KS |
270 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
271 | const char *buf, size_t count) | |
272 | { | |
60a96a59 KS |
273 | enum kobject_action action; |
274 | ||
5c5daf65 | 275 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
276 | kobject_uevent(&dev->kobj, action); |
277 | goto out; | |
278 | } | |
279 | ||
280 | dev_err(dev, "uevent: unsupported action-string; this will " | |
281 | "be ignored in a future kernel version\n"); | |
312c004d | 282 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 283 | out: |
a7fd6706 KS |
284 | return count; |
285 | } | |
286 | ||
ad6a1e1c TH |
287 | static struct device_attribute uevent_attr = |
288 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
289 | ||
621a1672 DT |
290 | static int device_add_attributes(struct device *dev, |
291 | struct device_attribute *attrs) | |
de0ff00d | 292 | { |
621a1672 | 293 | int error = 0; |
de0ff00d | 294 | int i; |
621a1672 DT |
295 | |
296 | if (attrs) { | |
297 | for (i = 0; attr_name(attrs[i]); i++) { | |
298 | error = device_create_file(dev, &attrs[i]); | |
299 | if (error) | |
300 | break; | |
301 | } | |
302 | if (error) | |
303 | while (--i >= 0) | |
304 | device_remove_file(dev, &attrs[i]); | |
305 | } | |
306 | return error; | |
307 | } | |
308 | ||
309 | static void device_remove_attributes(struct device *dev, | |
310 | struct device_attribute *attrs) | |
311 | { | |
312 | int i; | |
313 | ||
314 | if (attrs) | |
315 | for (i = 0; attr_name(attrs[i]); i++) | |
316 | device_remove_file(dev, &attrs[i]); | |
317 | } | |
318 | ||
319 | static int device_add_groups(struct device *dev, | |
320 | struct attribute_group **groups) | |
321 | { | |
de0ff00d | 322 | int error = 0; |
621a1672 | 323 | int i; |
de0ff00d | 324 | |
621a1672 DT |
325 | if (groups) { |
326 | for (i = 0; groups[i]; i++) { | |
327 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
328 | if (error) { |
329 | while (--i >= 0) | |
4a3ad20c GKH |
330 | sysfs_remove_group(&dev->kobj, |
331 | groups[i]); | |
621a1672 | 332 | break; |
de0ff00d GKH |
333 | } |
334 | } | |
335 | } | |
de0ff00d GKH |
336 | return error; |
337 | } | |
338 | ||
621a1672 DT |
339 | static void device_remove_groups(struct device *dev, |
340 | struct attribute_group **groups) | |
de0ff00d GKH |
341 | { |
342 | int i; | |
621a1672 DT |
343 | |
344 | if (groups) | |
345 | for (i = 0; groups[i]; i++) | |
346 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
347 | } |
348 | ||
2620efef GKH |
349 | static int device_add_attrs(struct device *dev) |
350 | { | |
351 | struct class *class = dev->class; | |
f9f852df | 352 | struct device_type *type = dev->type; |
621a1672 | 353 | int error; |
2620efef | 354 | |
621a1672 DT |
355 | if (class) { |
356 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 357 | if (error) |
621a1672 | 358 | return error; |
2620efef | 359 | } |
f9f852df | 360 | |
621a1672 DT |
361 | if (type) { |
362 | error = device_add_groups(dev, type->groups); | |
f9f852df | 363 | if (error) |
621a1672 | 364 | goto err_remove_class_attrs; |
f9f852df KS |
365 | } |
366 | ||
621a1672 DT |
367 | error = device_add_groups(dev, dev->groups); |
368 | if (error) | |
369 | goto err_remove_type_groups; | |
370 | ||
371 | return 0; | |
372 | ||
373 | err_remove_type_groups: | |
374 | if (type) | |
375 | device_remove_groups(dev, type->groups); | |
376 | err_remove_class_attrs: | |
377 | if (class) | |
378 | device_remove_attributes(dev, class->dev_attrs); | |
379 | ||
2620efef GKH |
380 | return error; |
381 | } | |
382 | ||
383 | static void device_remove_attrs(struct device *dev) | |
384 | { | |
385 | struct class *class = dev->class; | |
f9f852df | 386 | struct device_type *type = dev->type; |
2620efef | 387 | |
621a1672 | 388 | device_remove_groups(dev, dev->groups); |
f9f852df | 389 | |
621a1672 DT |
390 | if (type) |
391 | device_remove_groups(dev, type->groups); | |
392 | ||
393 | if (class) | |
394 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
395 | } |
396 | ||
397 | ||
23681e47 GKH |
398 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
399 | char *buf) | |
400 | { | |
401 | return print_dev_t(buf, dev->devt); | |
402 | } | |
403 | ||
ad6a1e1c TH |
404 | static struct device_attribute devt_attr = |
405 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
406 | ||
881c6cfd GKH |
407 | /* kset to create /sys/devices/ */ |
408 | struct kset *devices_kset; | |
1da177e4 | 409 | |
1da177e4 | 410 | /** |
4a3ad20c GKH |
411 | * device_create_file - create sysfs attribute file for device. |
412 | * @dev: device. | |
413 | * @attr: device attribute descriptor. | |
1da177e4 | 414 | */ |
4a3ad20c | 415 | int device_create_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
416 | { |
417 | int error = 0; | |
418 | if (get_device(dev)) { | |
419 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
420 | put_device(dev); | |
421 | } | |
422 | return error; | |
423 | } | |
424 | ||
425 | /** | |
4a3ad20c GKH |
426 | * device_remove_file - remove sysfs attribute file. |
427 | * @dev: device. | |
428 | * @attr: device attribute descriptor. | |
1da177e4 | 429 | */ |
4a3ad20c | 430 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
431 | { |
432 | if (get_device(dev)) { | |
433 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
434 | put_device(dev); | |
435 | } | |
436 | } | |
437 | ||
2589f188 GKH |
438 | /** |
439 | * device_create_bin_file - create sysfs binary attribute file for device. | |
440 | * @dev: device. | |
441 | * @attr: device binary attribute descriptor. | |
442 | */ | |
443 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
444 | { | |
445 | int error = -EINVAL; | |
446 | if (dev) | |
447 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
448 | return error; | |
449 | } | |
450 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
451 | ||
452 | /** | |
453 | * device_remove_bin_file - remove sysfs binary attribute file | |
454 | * @dev: device. | |
455 | * @attr: device binary attribute descriptor. | |
456 | */ | |
457 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
458 | { | |
459 | if (dev) | |
460 | sysfs_remove_bin_file(&dev->kobj, attr); | |
461 | } | |
462 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
463 | ||
d9a9cdfb | 464 | /** |
523ded71 | 465 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
466 | * @dev: device. |
467 | * @func: callback function to invoke later. | |
523ded71 | 468 | * @owner: module owning the callback routine |
d9a9cdfb AS |
469 | * |
470 | * Attribute methods must not unregister themselves or their parent device | |
471 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
472 | * since unregistration is mutually exclusive with driver callbacks. | |
473 | * | |
474 | * Instead methods can call this routine, which will attempt to allocate | |
475 | * and schedule a workqueue request to call back @func with @dev as its | |
476 | * argument in the workqueue's process context. @dev will be pinned until | |
477 | * @func returns. | |
478 | * | |
523ded71 AS |
479 | * This routine is usually called via the inline device_schedule_callback(), |
480 | * which automatically sets @owner to THIS_MODULE. | |
481 | * | |
d9a9cdfb | 482 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 483 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
484 | * |
485 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
486 | * underlying sysfs routine (since it is intended for use by attribute | |
487 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
488 | */ | |
523ded71 AS |
489 | int device_schedule_callback_owner(struct device *dev, |
490 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
491 | { |
492 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 493 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 494 | } |
523ded71 | 495 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 496 | |
34bb61f9 JB |
497 | static void klist_children_get(struct klist_node *n) |
498 | { | |
499 | struct device *dev = container_of(n, struct device, knode_parent); | |
500 | ||
501 | get_device(dev); | |
502 | } | |
503 | ||
504 | static void klist_children_put(struct klist_node *n) | |
505 | { | |
506 | struct device *dev = container_of(n, struct device, knode_parent); | |
507 | ||
508 | put_device(dev); | |
509 | } | |
510 | ||
1da177e4 | 511 | /** |
4a3ad20c GKH |
512 | * device_initialize - init device structure. |
513 | * @dev: device. | |
1da177e4 | 514 | * |
4a3ad20c GKH |
515 | * This prepares the device for use by other layers, |
516 | * including adding it to the device hierarchy. | |
517 | * It is the first half of device_register(), if called by | |
518 | * that, though it can also be called separately, so one | |
519 | * may use @dev's fields (e.g. the refcount). | |
1da177e4 | 520 | */ |
1da177e4 LT |
521 | void device_initialize(struct device *dev) |
522 | { | |
881c6cfd | 523 | dev->kobj.kset = devices_kset; |
f9cb074b | 524 | kobject_init(&dev->kobj, &device_ktype); |
34bb61f9 JB |
525 | klist_init(&dev->klist_children, klist_children_get, |
526 | klist_children_put); | |
1da177e4 | 527 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 528 | INIT_LIST_HEAD(&dev->node); |
af70316a | 529 | init_MUTEX(&dev->sem); |
9ac7849e TH |
530 | spin_lock_init(&dev->devres_lock); |
531 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 532 | device_init_wakeup(dev, 0); |
87348136 | 533 | set_dev_node(dev, -1); |
1da177e4 LT |
534 | } |
535 | ||
40fa5422 | 536 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
537 | static struct kobject *get_device_parent(struct device *dev, |
538 | struct device *parent) | |
40fa5422 | 539 | { |
da231fd5 | 540 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 541 | if (dev->class && (!parent || parent->class != dev->class)) |
823bccfc | 542 | return &dev->class->subsys.kobj; |
da231fd5 | 543 | /* all other devices keep their parent */ |
40fa5422 | 544 | else if (parent) |
c744aeae | 545 | return &parent->kobj; |
40fa5422 | 546 | |
c744aeae | 547 | return NULL; |
40fa5422 | 548 | } |
da231fd5 KS |
549 | |
550 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
551 | static inline void cleanup_glue_dir(struct device *dev, |
552 | struct kobject *glue_dir) {} | |
40fa5422 | 553 | #else |
86406245 | 554 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 555 | { |
86406245 | 556 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 557 | |
86406245 | 558 | if (!virtual_dir) |
4ff6abff | 559 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 560 | &devices_kset->kobj); |
f0ee61a6 | 561 | |
86406245 | 562 | return virtual_dir; |
f0ee61a6 GKH |
563 | } |
564 | ||
da231fd5 KS |
565 | static struct kobject *get_device_parent(struct device *dev, |
566 | struct device *parent) | |
40fa5422 | 567 | { |
43968d2f GKH |
568 | int retval; |
569 | ||
86406245 KS |
570 | if (dev->class) { |
571 | struct kobject *kobj = NULL; | |
572 | struct kobject *parent_kobj; | |
573 | struct kobject *k; | |
574 | ||
575 | /* | |
576 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
577 | * Class-devices with a non class-device as parent, live |
578 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
579 | */ |
580 | if (parent == NULL) | |
581 | parent_kobj = virtual_device_parent(dev); | |
582 | else if (parent->class) | |
583 | return &parent->kobj; | |
584 | else | |
585 | parent_kobj = &parent->kobj; | |
586 | ||
587 | /* find our class-directory at the parent and reference it */ | |
588 | spin_lock(&dev->class->class_dirs.list_lock); | |
589 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
590 | if (k->parent == parent_kobj) { | |
591 | kobj = kobject_get(k); | |
592 | break; | |
593 | } | |
594 | spin_unlock(&dev->class->class_dirs.list_lock); | |
595 | if (kobj) | |
596 | return kobj; | |
597 | ||
598 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
599 | k = kobject_create(); |
600 | if (!k) | |
601 | return NULL; | |
602 | k->kset = &dev->class->class_dirs; | |
b2d6db58 | 603 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f GKH |
604 | if (retval < 0) { |
605 | kobject_put(k); | |
606 | return NULL; | |
607 | } | |
0f4dafc0 | 608 | /* do not emit an uevent for this simple "glue" directory */ |
43968d2f | 609 | return k; |
86406245 KS |
610 | } |
611 | ||
612 | if (parent) | |
c744aeae CH |
613 | return &parent->kobj; |
614 | return NULL; | |
615 | } | |
da231fd5 | 616 | |
63b6971a | 617 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 618 | { |
0f4dafc0 KS |
619 | /* see if we live in a "glue" directory */ |
620 | if (!dev->class || glue_dir->kset != &dev->class->class_dirs) | |
da231fd5 KS |
621 | return; |
622 | ||
0f4dafc0 | 623 | kobject_put(glue_dir); |
da231fd5 | 624 | } |
63b6971a CH |
625 | |
626 | static void cleanup_device_parent(struct device *dev) | |
627 | { | |
628 | cleanup_glue_dir(dev, dev->kobj.parent); | |
629 | } | |
c744aeae | 630 | #endif |
86406245 | 631 | |
63b6971a | 632 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
633 | { |
634 | struct kobject *kobj; | |
635 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
636 | if (kobj) |
637 | dev->kobj.parent = kobj; | |
40fa5422 | 638 | } |
40fa5422 | 639 | |
2ee97caf CH |
640 | static int device_add_class_symlinks(struct device *dev) |
641 | { | |
642 | int error; | |
643 | ||
644 | if (!dev->class) | |
645 | return 0; | |
da231fd5 | 646 | |
2ee97caf CH |
647 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, |
648 | "subsystem"); | |
649 | if (error) | |
650 | goto out; | |
da231fd5 KS |
651 | |
652 | #ifdef CONFIG_SYSFS_DEPRECATED | |
653 | /* stacked class devices need a symlink in the class directory */ | |
edfaa7c3 KS |
654 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
655 | dev->type != &part_type) { | |
2ee97caf CH |
656 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
657 | dev->bus_id); | |
658 | if (error) | |
659 | goto out_subsys; | |
660 | } | |
da231fd5 | 661 | |
edfaa7c3 | 662 | if (dev->parent && dev->type != &part_type) { |
da231fd5 KS |
663 | struct device *parent = dev->parent; |
664 | char *class_name; | |
4f01a757 | 665 | |
da231fd5 KS |
666 | /* |
667 | * stacked class devices have the 'device' link | |
668 | * pointing to the bus device instead of the parent | |
669 | */ | |
670 | while (parent->class && !parent->bus && parent->parent) | |
671 | parent = parent->parent; | |
672 | ||
673 | error = sysfs_create_link(&dev->kobj, | |
674 | &parent->kobj, | |
4f01a757 DT |
675 | "device"); |
676 | if (error) | |
677 | goto out_busid; | |
da231fd5 KS |
678 | |
679 | class_name = make_class_name(dev->class->name, | |
680 | &dev->kobj); | |
681 | if (class_name) | |
682 | error = sysfs_create_link(&dev->parent->kobj, | |
683 | &dev->kobj, class_name); | |
684 | kfree(class_name); | |
685 | if (error) | |
686 | goto out_device; | |
2ee97caf CH |
687 | } |
688 | return 0; | |
689 | ||
2ee97caf | 690 | out_device: |
edfaa7c3 | 691 | if (dev->parent && dev->type != &part_type) |
2ee97caf | 692 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 693 | out_busid: |
edfaa7c3 KS |
694 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
695 | dev->type != &part_type) | |
2ee97caf | 696 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
da231fd5 KS |
697 | #else |
698 | /* link in the class directory pointing to the device */ | |
699 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
700 | dev->bus_id); | |
701 | if (error) | |
702 | goto out_subsys; | |
703 | ||
edfaa7c3 | 704 | if (dev->parent && dev->type != &part_type) { |
da231fd5 KS |
705 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
706 | "device"); | |
707 | if (error) | |
708 | goto out_busid; | |
709 | } | |
710 | return 0; | |
711 | ||
712 | out_busid: | |
713 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
714 | #endif | |
715 | ||
2ee97caf CH |
716 | out_subsys: |
717 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
718 | out: | |
719 | return error; | |
720 | } | |
721 | ||
722 | static void device_remove_class_symlinks(struct device *dev) | |
723 | { | |
724 | if (!dev->class) | |
725 | return; | |
da231fd5 | 726 | |
2ee97caf | 727 | #ifdef CONFIG_SYSFS_DEPRECATED |
edfaa7c3 | 728 | if (dev->parent && dev->type != &part_type) { |
2ee97caf CH |
729 | char *class_name; |
730 | ||
731 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
732 | if (class_name) { | |
733 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
734 | kfree(class_name); | |
735 | } | |
2ee97caf CH |
736 | sysfs_remove_link(&dev->kobj, "device"); |
737 | } | |
da231fd5 | 738 | |
edfaa7c3 KS |
739 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
740 | dev->type != &part_type) | |
2ee97caf | 741 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
da231fd5 | 742 | #else |
edfaa7c3 | 743 | if (dev->parent && dev->type != &part_type) |
da231fd5 KS |
744 | sysfs_remove_link(&dev->kobj, "device"); |
745 | ||
746 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
747 | #endif | |
748 | ||
2ee97caf CH |
749 | sysfs_remove_link(&dev->kobj, "subsystem"); |
750 | } | |
751 | ||
1da177e4 | 752 | /** |
4a3ad20c GKH |
753 | * device_add - add device to device hierarchy. |
754 | * @dev: device. | |
1da177e4 | 755 | * |
4a3ad20c GKH |
756 | * This is part 2 of device_register(), though may be called |
757 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 758 | * |
4a3ad20c GKH |
759 | * This adds it to the kobject hierarchy via kobject_add(), adds it |
760 | * to the global and sibling lists for the device, then | |
761 | * adds it to the other relevant subsystems of the driver model. | |
1da177e4 LT |
762 | */ |
763 | int device_add(struct device *dev) | |
764 | { | |
765 | struct device *parent = NULL; | |
c47ed219 | 766 | struct class_interface *class_intf; |
775b64d2 RW |
767 | int error; |
768 | ||
769 | error = pm_sleep_lock(); | |
770 | if (error) { | |
771 | dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__); | |
772 | dump_stack(); | |
773 | return error; | |
774 | } | |
1da177e4 LT |
775 | |
776 | dev = get_device(dev); | |
775b64d2 RW |
777 | if (!dev || !strlen(dev->bus_id)) { |
778 | error = -EINVAL; | |
1da177e4 | 779 | goto Error; |
775b64d2 | 780 | } |
1da177e4 | 781 | |
7dc72b28 | 782 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
c205ef48 | 783 | |
1da177e4 | 784 | parent = get_device(dev->parent); |
63b6971a | 785 | setup_parent(dev, parent); |
1da177e4 LT |
786 | |
787 | /* first, register with generic layer. */ | |
b2d6db58 | 788 | error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
40fa5422 | 789 | if (error) |
1da177e4 | 790 | goto Error; |
a7fd6706 | 791 | |
37022644 BW |
792 | /* notify platform of device entry */ |
793 | if (platform_notify) | |
794 | platform_notify(dev); | |
795 | ||
116af378 BH |
796 | /* notify clients of device entry (new way) */ |
797 | if (dev->bus) | |
c6f7e72a | 798 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
799 | BUS_NOTIFY_ADD_DEVICE, dev); |
800 | ||
ad6a1e1c | 801 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
802 | if (error) |
803 | goto attrError; | |
a7fd6706 | 804 | |
23681e47 | 805 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
806 | error = device_create_file(dev, &devt_attr); |
807 | if (error) | |
a306eea4 | 808 | goto ueventattrError; |
23681e47 GKH |
809 | } |
810 | ||
2ee97caf CH |
811 | error = device_add_class_symlinks(dev); |
812 | if (error) | |
813 | goto SymlinkError; | |
dc0afa83 CH |
814 | error = device_add_attrs(dev); |
815 | if (error) | |
2620efef | 816 | goto AttrsError; |
dec13c15 | 817 | error = dpm_sysfs_add(dev); |
dc0afa83 | 818 | if (error) |
1da177e4 | 819 | goto PMError; |
dec13c15 | 820 | device_pm_add(dev); |
dc0afa83 CH |
821 | error = bus_add_device(dev); |
822 | if (error) | |
1da177e4 | 823 | goto BusError; |
83b5fb4c | 824 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 825 | bus_attach_device(dev); |
1da177e4 | 826 | if (parent) |
d856f1e3 | 827 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 828 | |
5d9fd169 | 829 | if (dev->class) { |
5d9fd169 | 830 | down(&dev->class->sem); |
c47ed219 | 831 | /* tie the class to the device */ |
5d9fd169 | 832 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
833 | |
834 | /* notify any interfaces that the device is here */ | |
835 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
836 | if (class_intf->add_dev) | |
837 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
838 | up(&dev->class->sem); |
839 | } | |
1da177e4 LT |
840 | Done: |
841 | put_device(dev); | |
775b64d2 | 842 | pm_sleep_unlock(); |
1da177e4 LT |
843 | return error; |
844 | BusError: | |
845 | device_pm_remove(dev); | |
dec13c15 | 846 | dpm_sysfs_remove(dev); |
1da177e4 | 847 | PMError: |
116af378 | 848 | if (dev->bus) |
c6f7e72a | 849 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 850 | BUS_NOTIFY_DEL_DEVICE, dev); |
82f0cf9b | 851 | device_remove_attrs(dev); |
2620efef | 852 | AttrsError: |
2ee97caf CH |
853 | device_remove_class_symlinks(dev); |
854 | SymlinkError: | |
ad6a1e1c TH |
855 | if (MAJOR(dev->devt)) |
856 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 857 | ueventattrError: |
ad6a1e1c | 858 | device_remove_file(dev, &uevent_attr); |
23681e47 | 859 | attrError: |
312c004d | 860 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
861 | kobject_del(&dev->kobj); |
862 | Error: | |
63b6971a | 863 | cleanup_device_parent(dev); |
1da177e4 LT |
864 | if (parent) |
865 | put_device(parent); | |
866 | goto Done; | |
867 | } | |
868 | ||
1da177e4 | 869 | /** |
4a3ad20c GKH |
870 | * device_register - register a device with the system. |
871 | * @dev: pointer to the device structure | |
1da177e4 | 872 | * |
4a3ad20c GKH |
873 | * This happens in two clean steps - initialize the device |
874 | * and add it to the system. The two steps can be called | |
875 | * separately, but this is the easiest and most common. | |
876 | * I.e. you should only call the two helpers separately if | |
877 | * have a clearly defined need to use and refcount the device | |
878 | * before it is added to the hierarchy. | |
1da177e4 | 879 | */ |
1da177e4 LT |
880 | int device_register(struct device *dev) |
881 | { | |
882 | device_initialize(dev); | |
883 | return device_add(dev); | |
884 | } | |
885 | ||
1da177e4 | 886 | /** |
4a3ad20c GKH |
887 | * get_device - increment reference count for device. |
888 | * @dev: device. | |
1da177e4 | 889 | * |
4a3ad20c GKH |
890 | * This simply forwards the call to kobject_get(), though |
891 | * we do take care to provide for the case that we get a NULL | |
892 | * pointer passed in. | |
1da177e4 | 893 | */ |
4a3ad20c | 894 | struct device *get_device(struct device *dev) |
1da177e4 LT |
895 | { |
896 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
897 | } | |
898 | ||
1da177e4 | 899 | /** |
4a3ad20c GKH |
900 | * put_device - decrement reference count. |
901 | * @dev: device in question. | |
1da177e4 | 902 | */ |
4a3ad20c | 903 | void put_device(struct device *dev) |
1da177e4 | 904 | { |
edfaa7c3 | 905 | /* might_sleep(); */ |
1da177e4 LT |
906 | if (dev) |
907 | kobject_put(&dev->kobj); | |
908 | } | |
909 | ||
1da177e4 | 910 | /** |
4a3ad20c GKH |
911 | * device_del - delete device from system. |
912 | * @dev: device. | |
1da177e4 | 913 | * |
4a3ad20c GKH |
914 | * This is the first part of the device unregistration |
915 | * sequence. This removes the device from the lists we control | |
916 | * from here, has it removed from the other driver model | |
917 | * subsystems it was added to in device_add(), and removes it | |
918 | * from the kobject hierarchy. | |
1da177e4 | 919 | * |
4a3ad20c GKH |
920 | * NOTE: this should be called manually _iff_ device_add() was |
921 | * also called manually. | |
1da177e4 | 922 | */ |
4a3ad20c | 923 | void device_del(struct device *dev) |
1da177e4 | 924 | { |
4a3ad20c | 925 | struct device *parent = dev->parent; |
c47ed219 | 926 | struct class_interface *class_intf; |
1da177e4 | 927 | |
775b64d2 | 928 | device_pm_remove(dev); |
1da177e4 | 929 | if (parent) |
d62c0f9f | 930 | klist_del(&dev->knode_parent); |
ad6a1e1c TH |
931 | if (MAJOR(dev->devt)) |
932 | device_remove_file(dev, &devt_attr); | |
b9d9c82b | 933 | if (dev->class) { |
da231fd5 | 934 | device_remove_class_symlinks(dev); |
99ef3ef8 | 935 | |
5d9fd169 | 936 | down(&dev->class->sem); |
c47ed219 GKH |
937 | /* notify any interfaces that the device is now gone */ |
938 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
939 | if (class_intf->remove_dev) | |
940 | class_intf->remove_dev(dev, class_intf); | |
941 | /* remove the device from the class list */ | |
5d9fd169 GKH |
942 | list_del_init(&dev->node); |
943 | up(&dev->class->sem); | |
b9d9c82b | 944 | } |
ad6a1e1c | 945 | device_remove_file(dev, &uevent_attr); |
2620efef | 946 | device_remove_attrs(dev); |
28953533 | 947 | bus_remove_device(dev); |
1da177e4 | 948 | |
2f8d16a9 TH |
949 | /* |
950 | * Some platform devices are driven without driver attached | |
951 | * and managed resources may have been acquired. Make sure | |
952 | * all resources are released. | |
953 | */ | |
954 | devres_release_all(dev); | |
955 | ||
1da177e4 LT |
956 | /* Notify the platform of the removal, in case they |
957 | * need to do anything... | |
958 | */ | |
959 | if (platform_notify_remove) | |
960 | platform_notify_remove(dev); | |
116af378 | 961 | if (dev->bus) |
c6f7e72a | 962 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 963 | BUS_NOTIFY_DEL_DEVICE, dev); |
312c004d | 964 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 965 | cleanup_device_parent(dev); |
1da177e4 | 966 | kobject_del(&dev->kobj); |
da231fd5 | 967 | put_device(parent); |
1da177e4 LT |
968 | } |
969 | ||
970 | /** | |
4a3ad20c GKH |
971 | * device_unregister - unregister device from system. |
972 | * @dev: device going away. | |
1da177e4 | 973 | * |
4a3ad20c GKH |
974 | * We do this in two parts, like we do device_register(). First, |
975 | * we remove it from all the subsystems with device_del(), then | |
976 | * we decrement the reference count via put_device(). If that | |
977 | * is the final reference count, the device will be cleaned up | |
978 | * via device_release() above. Otherwise, the structure will | |
979 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 980 | */ |
4a3ad20c | 981 | void device_unregister(struct device *dev) |
1da177e4 | 982 | { |
7dc72b28 | 983 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
1da177e4 LT |
984 | device_del(dev); |
985 | put_device(dev); | |
986 | } | |
987 | ||
4a3ad20c | 988 | static struct device *next_device(struct klist_iter *i) |
36239577 | 989 | { |
4a3ad20c | 990 | struct klist_node *n = klist_next(i); |
36239577 | 991 | return n ? container_of(n, struct device, knode_parent) : NULL; |
992 | } | |
993 | ||
1da177e4 | 994 | /** |
4a3ad20c GKH |
995 | * device_for_each_child - device child iterator. |
996 | * @parent: parent struct device. | |
997 | * @data: data for the callback. | |
998 | * @fn: function to be called for each device. | |
1da177e4 | 999 | * |
4a3ad20c GKH |
1000 | * Iterate over @parent's child devices, and call @fn for each, |
1001 | * passing it @data. | |
1da177e4 | 1002 | * |
4a3ad20c GKH |
1003 | * We check the return of @fn each time. If it returns anything |
1004 | * other than 0, we break out and return that value. | |
1da177e4 | 1005 | */ |
4a3ad20c GKH |
1006 | int device_for_each_child(struct device *parent, void *data, |
1007 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1008 | { |
36239577 | 1009 | struct klist_iter i; |
4a3ad20c | 1010 | struct device *child; |
1da177e4 LT |
1011 | int error = 0; |
1012 | ||
36239577 | 1013 | klist_iter_init(&parent->klist_children, &i); |
1014 | while ((child = next_device(&i)) && !error) | |
1015 | error = fn(child, data); | |
1016 | klist_iter_exit(&i); | |
1da177e4 LT |
1017 | return error; |
1018 | } | |
1019 | ||
5ab69981 CH |
1020 | /** |
1021 | * device_find_child - device iterator for locating a particular device. | |
1022 | * @parent: parent struct device | |
1023 | * @data: Data to pass to match function | |
1024 | * @match: Callback function to check device | |
1025 | * | |
1026 | * This is similar to the device_for_each_child() function above, but it | |
1027 | * returns a reference to a device that is 'found' for later use, as | |
1028 | * determined by the @match callback. | |
1029 | * | |
1030 | * The callback should return 0 if the device doesn't match and non-zero | |
1031 | * if it does. If the callback returns non-zero and a reference to the | |
1032 | * current device can be obtained, this function will return to the caller | |
1033 | * and not iterate over any more devices. | |
1034 | */ | |
4a3ad20c GKH |
1035 | struct device *device_find_child(struct device *parent, void *data, |
1036 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1037 | { |
1038 | struct klist_iter i; | |
1039 | struct device *child; | |
1040 | ||
1041 | if (!parent) | |
1042 | return NULL; | |
1043 | ||
1044 | klist_iter_init(&parent->klist_children, &i); | |
1045 | while ((child = next_device(&i))) | |
1046 | if (match(child, data) && get_device(child)) | |
1047 | break; | |
1048 | klist_iter_exit(&i); | |
1049 | return child; | |
1050 | } | |
1051 | ||
1da177e4 LT |
1052 | int __init devices_init(void) |
1053 | { | |
881c6cfd GKH |
1054 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1055 | if (!devices_kset) | |
1056 | return -ENOMEM; | |
1057 | return 0; | |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1061 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1062 | |
1063 | EXPORT_SYMBOL_GPL(device_initialize); | |
1064 | EXPORT_SYMBOL_GPL(device_add); | |
1065 | EXPORT_SYMBOL_GPL(device_register); | |
1066 | ||
1067 | EXPORT_SYMBOL_GPL(device_del); | |
1068 | EXPORT_SYMBOL_GPL(device_unregister); | |
1069 | EXPORT_SYMBOL_GPL(get_device); | |
1070 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1071 | |
1072 | EXPORT_SYMBOL_GPL(device_create_file); | |
1073 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1074 | |
1075 | ||
1076 | static void device_create_release(struct device *dev) | |
1077 | { | |
7dc72b28 | 1078 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
23681e47 GKH |
1079 | kfree(dev); |
1080 | } | |
1081 | ||
1082 | /** | |
1083 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1084 | * @class: pointer to the struct class that this device should be registered to |
1085 | * @parent: pointer to the parent struct device of this new device, if any | |
1086 | * @devt: the dev_t for the char device to be added | |
1087 | * @fmt: string for the device's name | |
1088 | * | |
1089 | * This function can be used by char device classes. A struct device | |
1090 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1091 | * |
23681e47 GKH |
1092 | * A "dev" file will be created, showing the dev_t for the device, if |
1093 | * the dev_t is not 0,0. | |
42734daf HK |
1094 | * If a pointer to a parent struct device is passed in, the newly created |
1095 | * struct device will be a child of that device in sysfs. | |
1096 | * The pointer to the struct device will be returned from the call. | |
1097 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1098 | * pointer. |
1099 | * | |
1100 | * Note: the struct class passed to this function must have previously | |
1101 | * been created with a call to class_create(). | |
1102 | */ | |
1103 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1104 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1105 | { |
1106 | va_list args; | |
1107 | struct device *dev = NULL; | |
1108 | int retval = -ENODEV; | |
1109 | ||
1110 | if (class == NULL || IS_ERR(class)) | |
1111 | goto error; | |
23681e47 GKH |
1112 | |
1113 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1114 | if (!dev) { | |
1115 | retval = -ENOMEM; | |
1116 | goto error; | |
1117 | } | |
1118 | ||
1119 | dev->devt = devt; | |
1120 | dev->class = class; | |
1121 | dev->parent = parent; | |
1122 | dev->release = device_create_release; | |
1123 | ||
1124 | va_start(args, fmt); | |
1125 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1126 | va_end(args); | |
1127 | retval = device_register(dev); | |
1128 | if (retval) | |
1129 | goto error; | |
1130 | ||
23681e47 GKH |
1131 | return dev; |
1132 | ||
1133 | error: | |
1134 | kfree(dev); | |
1135 | return ERR_PTR(retval); | |
1136 | } | |
1137 | EXPORT_SYMBOL_GPL(device_create); | |
1138 | ||
1139 | /** | |
775b64d2 | 1140 | * find_device - finds a device that was created with device_create() |
42734daf HK |
1141 | * @class: pointer to the struct class that this device was registered with |
1142 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 1143 | */ |
775b64d2 | 1144 | static struct device *find_device(struct class *class, dev_t devt) |
23681e47 GKH |
1145 | { |
1146 | struct device *dev = NULL; | |
1147 | struct device *dev_tmp; | |
1148 | ||
1149 | down(&class->sem); | |
1150 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1151 | if (dev_tmp->devt == devt) { | |
1152 | dev = dev_tmp; | |
1153 | break; | |
1154 | } | |
1155 | } | |
1156 | up(&class->sem); | |
775b64d2 RW |
1157 | return dev; |
1158 | } | |
1159 | ||
1160 | /** | |
1161 | * device_destroy - removes a device that was created with device_create() | |
1162 | * @class: pointer to the struct class that this device was registered with | |
1163 | * @devt: the dev_t of the device that was previously registered | |
1164 | * | |
1165 | * This call unregisters and cleans up a device that was created with a | |
1166 | * call to device_create(). | |
1167 | */ | |
1168 | void device_destroy(struct class *class, dev_t devt) | |
1169 | { | |
1170 | struct device *dev; | |
23681e47 | 1171 | |
775b64d2 | 1172 | dev = find_device(class, devt); |
5d9fd169 | 1173 | if (dev) |
23681e47 | 1174 | device_unregister(dev); |
23681e47 GKH |
1175 | } |
1176 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca | 1177 | |
775b64d2 RW |
1178 | #ifdef CONFIG_PM_SLEEP |
1179 | /** | |
1180 | * destroy_suspended_device - asks the PM core to remove a suspended device | |
1181 | * @class: pointer to the struct class that this device was registered with | |
1182 | * @devt: the dev_t of the device that was previously registered | |
1183 | * | |
1184 | * This call notifies the PM core of the necessity to unregister a suspended | |
1185 | * device created with a call to device_create() (devices cannot be | |
1186 | * unregistered directly while suspended, since the PM core holds their | |
1187 | * semaphores at that time). | |
1188 | * | |
1189 | * It can only be called within the scope of a system sleep transition. In | |
1190 | * practice this means it has to be directly or indirectly invoked either by | |
1191 | * a suspend or resume method, or by the PM core (e.g. via | |
1192 | * disable_nonboot_cpus() or enable_nonboot_cpus()). | |
1193 | */ | |
1194 | void destroy_suspended_device(struct class *class, dev_t devt) | |
1195 | { | |
1196 | struct device *dev; | |
1197 | ||
1198 | dev = find_device(class, devt); | |
1199 | if (dev) | |
1200 | device_pm_schedule_removal(dev); | |
1201 | } | |
1202 | EXPORT_SYMBOL_GPL(destroy_suspended_device); | |
1203 | #endif /* CONFIG_PM_SLEEP */ | |
1204 | ||
a2de48ca GKH |
1205 | /** |
1206 | * device_rename - renames a device | |
1207 | * @dev: the pointer to the struct device to be renamed | |
1208 | * @new_name: the new name of the device | |
1209 | */ | |
1210 | int device_rename(struct device *dev, char *new_name) | |
1211 | { | |
1212 | char *old_class_name = NULL; | |
1213 | char *new_class_name = NULL; | |
2ee97caf | 1214 | char *old_device_name = NULL; |
a2de48ca GKH |
1215 | int error; |
1216 | ||
1217 | dev = get_device(dev); | |
1218 | if (!dev) | |
1219 | return -EINVAL; | |
1220 | ||
7dc72b28 GKH |
1221 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
1222 | __FUNCTION__, new_name); | |
a2de48ca | 1223 | |
99ef3ef8 | 1224 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1225 | if ((dev->class) && (dev->parent)) |
1226 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1227 | #endif |
a2de48ca | 1228 | |
2ee97caf CH |
1229 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1230 | if (!old_device_name) { | |
1231 | error = -ENOMEM; | |
1232 | goto out; | |
a2de48ca | 1233 | } |
2ee97caf | 1234 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1235 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1236 | ||
1237 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1238 | if (error) { |
1239 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1240 | goto out; | |
1241 | } | |
a2de48ca | 1242 | |
99ef3ef8 | 1243 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1244 | if (old_class_name) { |
1245 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1246 | if (new_class_name) { | |
2ee97caf CH |
1247 | error = sysfs_create_link(&dev->parent->kobj, |
1248 | &dev->kobj, new_class_name); | |
1249 | if (error) | |
1250 | goto out; | |
a2de48ca GKH |
1251 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1252 | } | |
1253 | } | |
60b8cabd | 1254 | #else |
a2de48ca | 1255 | if (dev->class) { |
2ee97caf CH |
1256 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
1257 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
1258 | dev->bus_id); | |
1259 | if (error) { | |
2ee97caf CH |
1260 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", |
1261 | __FUNCTION__, error); | |
1262 | } | |
a2de48ca | 1263 | } |
60b8cabd KS |
1264 | #endif |
1265 | ||
2ee97caf | 1266 | out: |
a2de48ca GKH |
1267 | put_device(dev); |
1268 | ||
a2de48ca | 1269 | kfree(new_class_name); |
952ab431 | 1270 | kfree(old_class_name); |
2ee97caf | 1271 | kfree(old_device_name); |
a2de48ca GKH |
1272 | |
1273 | return error; | |
1274 | } | |
a2807dbc | 1275 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1276 | |
1277 | static int device_move_class_links(struct device *dev, | |
1278 | struct device *old_parent, | |
1279 | struct device *new_parent) | |
1280 | { | |
f7f3461d | 1281 | int error = 0; |
8a82472f | 1282 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1283 | char *class_name; |
1284 | ||
1285 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1286 | if (!class_name) { | |
cb360bbf | 1287 | error = -ENOMEM; |
8a82472f CH |
1288 | goto out; |
1289 | } | |
1290 | if (old_parent) { | |
1291 | sysfs_remove_link(&dev->kobj, "device"); | |
1292 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1293 | } | |
c744aeae CH |
1294 | if (new_parent) { |
1295 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1296 | "device"); | |
1297 | if (error) | |
1298 | goto out; | |
1299 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1300 | class_name); | |
1301 | if (error) | |
1302 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1303 | } else |
c744aeae | 1304 | error = 0; |
8a82472f CH |
1305 | out: |
1306 | kfree(class_name); | |
1307 | return error; | |
1308 | #else | |
f7f3461d GKH |
1309 | if (old_parent) |
1310 | sysfs_remove_link(&dev->kobj, "device"); | |
1311 | if (new_parent) | |
1312 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1313 | "device"); | |
1314 | return error; | |
8a82472f CH |
1315 | #endif |
1316 | } | |
1317 | ||
1318 | /** | |
1319 | * device_move - moves a device to a new parent | |
1320 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1321 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1322 | */ |
1323 | int device_move(struct device *dev, struct device *new_parent) | |
1324 | { | |
1325 | int error; | |
1326 | struct device *old_parent; | |
c744aeae | 1327 | struct kobject *new_parent_kobj; |
8a82472f CH |
1328 | |
1329 | dev = get_device(dev); | |
1330 | if (!dev) | |
1331 | return -EINVAL; | |
1332 | ||
8a82472f | 1333 | new_parent = get_device(new_parent); |
4a3ad20c | 1334 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1335 | |
7dc72b28 GKH |
1336 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
1337 | __FUNCTION__, new_parent ? new_parent->bus_id : "<NULL>"); | |
c744aeae | 1338 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1339 | if (error) { |
63b6971a | 1340 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1341 | put_device(new_parent); |
1342 | goto out; | |
1343 | } | |
1344 | old_parent = dev->parent; | |
1345 | dev->parent = new_parent; | |
1346 | if (old_parent) | |
acf02d23 | 1347 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1348 | if (new_parent) |
1349 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1350 | if (!dev->class) |
1351 | goto out_put; | |
1352 | error = device_move_class_links(dev, old_parent, new_parent); | |
1353 | if (error) { | |
1354 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1355 | device_move_class_links(dev, new_parent, old_parent); | |
1356 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1357 | if (new_parent) |
1358 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1359 | if (old_parent) |
1360 | klist_add_tail(&dev->knode_parent, | |
1361 | &old_parent->klist_children); | |
1362 | } | |
63b6971a | 1363 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1364 | put_device(new_parent); |
1365 | goto out; | |
1366 | } | |
1367 | out_put: | |
1368 | put_device(old_parent); | |
1369 | out: | |
1370 | put_device(dev); | |
1371 | return error; | |
1372 | } | |
8a82472f | 1373 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1374 | |
1375 | /** | |
1376 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1377 | */ | |
1378 | void device_shutdown(void) | |
1379 | { | |
4a3ad20c | 1380 | struct device *dev, *devn; |
37b0c020 GKH |
1381 | |
1382 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1383 | kobj.entry) { | |
1384 | if (dev->bus && dev->bus->shutdown) { | |
1385 | dev_dbg(dev, "shutdown\n"); | |
1386 | dev->bus->shutdown(dev); | |
1387 | } else if (dev->driver && dev->driver->shutdown) { | |
1388 | dev_dbg(dev, "shutdown\n"); | |
1389 | dev->driver->shutdown(dev); | |
1390 | } | |
1391 | } | |
1392 | } |