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 | 29 | |
4e886c29 GKH |
30 | #ifdef CONFIG_BLOCK |
31 | static inline int device_is_not_partition(struct device *dev) | |
32 | { | |
33 | return !(dev->type == &part_type); | |
34 | } | |
35 | #else | |
36 | static inline int device_is_not_partition(struct device *dev) | |
37 | { | |
38 | return 1; | |
39 | } | |
40 | #endif | |
1da177e4 | 41 | |
3e95637a AS |
42 | /** |
43 | * dev_driver_string - Return a device's driver name, if at all possible | |
44 | * @dev: struct device to get the name of | |
45 | * | |
46 | * Will return the device's driver's name if it is bound to a device. If | |
47 | * the device is not bound to a device, it will return the name of the bus | |
48 | * it is attached to. If it is not attached to a bus either, an empty | |
49 | * string will be returned. | |
50 | */ | |
51 | const char *dev_driver_string(struct device *dev) | |
52 | { | |
53 | return dev->driver ? dev->driver->name : | |
a456b702 JD |
54 | (dev->bus ? dev->bus->name : |
55 | (dev->class ? dev->class->name : "")); | |
3e95637a | 56 | } |
310a922d | 57 | EXPORT_SYMBOL(dev_driver_string); |
3e95637a | 58 | |
1da177e4 LT |
59 | #define to_dev(obj) container_of(obj, struct device, kobj) |
60 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
61 | ||
4a3ad20c GKH |
62 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
63 | char *buf) | |
1da177e4 | 64 | { |
4a3ad20c GKH |
65 | struct device_attribute *dev_attr = to_dev_attr(attr); |
66 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 67 | ssize_t ret = -EIO; |
1da177e4 LT |
68 | |
69 | if (dev_attr->show) | |
54b6f35c | 70 | ret = dev_attr->show(dev, dev_attr, buf); |
1da177e4 LT |
71 | return ret; |
72 | } | |
73 | ||
4a3ad20c GKH |
74 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
75 | const char *buf, size_t count) | |
1da177e4 | 76 | { |
4a3ad20c GKH |
77 | struct device_attribute *dev_attr = to_dev_attr(attr); |
78 | struct device *dev = to_dev(kobj); | |
4a0c20bf | 79 | ssize_t ret = -EIO; |
1da177e4 LT |
80 | |
81 | if (dev_attr->store) | |
54b6f35c | 82 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
83 | return ret; |
84 | } | |
85 | ||
86 | static struct sysfs_ops dev_sysfs_ops = { | |
87 | .show = dev_attr_show, | |
88 | .store = dev_attr_store, | |
89 | }; | |
90 | ||
91 | ||
92 | /** | |
93 | * device_release - free device structure. | |
94 | * @kobj: device's kobject. | |
95 | * | |
96 | * This is called once the reference count for the object | |
97 | * reaches 0. We forward the call to the device's release | |
98 | * method, which should handle actually freeing the structure. | |
99 | */ | |
4a3ad20c | 100 | static void device_release(struct kobject *kobj) |
1da177e4 | 101 | { |
4a3ad20c | 102 | struct device *dev = to_dev(kobj); |
1da177e4 LT |
103 | |
104 | if (dev->release) | |
105 | dev->release(dev); | |
f9f852df KS |
106 | else if (dev->type && dev->type->release) |
107 | dev->type->release(dev); | |
2620efef GKH |
108 | else if (dev->class && dev->class->dev_release) |
109 | dev->class->dev_release(dev); | |
1da177e4 | 110 | else { |
4a3ad20c GKH |
111 | printk(KERN_ERR "Device '%s' does not have a release() " |
112 | "function, it is broken and must be fixed.\n", | |
1da177e4 LT |
113 | dev->bus_id); |
114 | WARN_ON(1); | |
115 | } | |
116 | } | |
117 | ||
8f4afc41 | 118 | static struct kobj_type device_ktype = { |
1da177e4 LT |
119 | .release = device_release, |
120 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
121 | }; |
122 | ||
123 | ||
312c004d | 124 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
125 | { |
126 | struct kobj_type *ktype = get_ktype(kobj); | |
127 | ||
8f4afc41 | 128 | if (ktype == &device_ktype) { |
1da177e4 | 129 | struct device *dev = to_dev(kobj); |
83b5fb4c CH |
130 | if (dev->uevent_suppress) |
131 | return 0; | |
1da177e4 LT |
132 | if (dev->bus) |
133 | return 1; | |
23681e47 GKH |
134 | if (dev->class) |
135 | return 1; | |
1da177e4 LT |
136 | } |
137 | return 0; | |
138 | } | |
139 | ||
312c004d | 140 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
141 | { |
142 | struct device *dev = to_dev(kobj); | |
143 | ||
23681e47 GKH |
144 | if (dev->bus) |
145 | return dev->bus->name; | |
146 | if (dev->class) | |
147 | return dev->class->name; | |
148 | return NULL; | |
1da177e4 LT |
149 | } |
150 | ||
7eff2e7a KS |
151 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
152 | struct kobj_uevent_env *env) | |
1da177e4 LT |
153 | { |
154 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
155 | int retval = 0; |
156 | ||
23681e47 GKH |
157 | /* add the major/minor if present */ |
158 | if (MAJOR(dev->devt)) { | |
7eff2e7a KS |
159 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
160 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
23681e47 GKH |
161 | } |
162 | ||
414264f9 | 163 | if (dev->type && dev->type->name) |
7eff2e7a | 164 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 165 | |
239378f1 | 166 | if (dev->driver) |
7eff2e7a | 167 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 168 | |
a87cb2ac | 169 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
170 | if (dev->class) { |
171 | struct device *parent = dev->parent; | |
172 | ||
173 | /* find first bus device in parent chain */ | |
174 | while (parent && !parent->bus) | |
175 | parent = parent->parent; | |
176 | if (parent && parent->bus) { | |
177 | const char *path; | |
178 | ||
179 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 180 | if (path) { |
7eff2e7a | 181 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
182 | kfree(path); |
183 | } | |
239378f1 | 184 | |
7eff2e7a | 185 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
186 | |
187 | if (parent->driver) | |
7eff2e7a KS |
188 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
189 | parent->driver->name); | |
239378f1 KS |
190 | } |
191 | } else if (dev->bus) { | |
7eff2e7a | 192 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
193 | |
194 | if (dev->driver) | |
4a3ad20c GKH |
195 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
196 | dev->driver->name); | |
d81d9d6b | 197 | } |
239378f1 | 198 | #endif |
1da177e4 | 199 | |
7eff2e7a | 200 | /* have the bus specific function add its stuff */ |
312c004d | 201 | if (dev->bus && dev->bus->uevent) { |
7eff2e7a | 202 | retval = dev->bus->uevent(dev, env); |
f9f852df | 203 | if (retval) |
7dc72b28 GKH |
204 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
205 | dev->bus_id, __FUNCTION__, retval); | |
1da177e4 LT |
206 | } |
207 | ||
7eff2e7a | 208 | /* have the class specific function add its stuff */ |
2620efef | 209 | if (dev->class && dev->class->dev_uevent) { |
7eff2e7a | 210 | retval = dev->class->dev_uevent(dev, env); |
f9f852df | 211 | if (retval) |
7dc72b28 GKH |
212 | pr_debug("device: '%s': %s: class uevent() " |
213 | "returned %d\n", dev->bus_id, | |
f9f852df KS |
214 | __FUNCTION__, retval); |
215 | } | |
216 | ||
7eff2e7a | 217 | /* have the device type specific fuction add its stuff */ |
f9f852df | 218 | if (dev->type && dev->type->uevent) { |
7eff2e7a | 219 | retval = dev->type->uevent(dev, env); |
f9f852df | 220 | if (retval) |
7dc72b28 GKH |
221 | pr_debug("device: '%s': %s: dev_type uevent() " |
222 | "returned %d\n", dev->bus_id, | |
f9f852df | 223 | __FUNCTION__, retval); |
2620efef GKH |
224 | } |
225 | ||
1da177e4 LT |
226 | return retval; |
227 | } | |
228 | ||
312c004d KS |
229 | static struct kset_uevent_ops device_uevent_ops = { |
230 | .filter = dev_uevent_filter, | |
231 | .name = dev_uevent_name, | |
232 | .uevent = dev_uevent, | |
1da177e4 LT |
233 | }; |
234 | ||
16574dcc KS |
235 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
236 | char *buf) | |
237 | { | |
238 | struct kobject *top_kobj; | |
239 | struct kset *kset; | |
7eff2e7a | 240 | struct kobj_uevent_env *env = NULL; |
16574dcc KS |
241 | int i; |
242 | size_t count = 0; | |
243 | int retval; | |
244 | ||
245 | /* search the kset, the device belongs to */ | |
246 | top_kobj = &dev->kobj; | |
5c5daf65 KS |
247 | while (!top_kobj->kset && top_kobj->parent) |
248 | top_kobj = top_kobj->parent; | |
16574dcc KS |
249 | if (!top_kobj->kset) |
250 | goto out; | |
5c5daf65 | 251 | |
16574dcc KS |
252 | kset = top_kobj->kset; |
253 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) | |
254 | goto out; | |
255 | ||
256 | /* respect filter */ | |
257 | if (kset->uevent_ops && kset->uevent_ops->filter) | |
258 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) | |
259 | goto out; | |
260 | ||
7eff2e7a KS |
261 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
262 | if (!env) | |
c7308c81 GKH |
263 | return -ENOMEM; |
264 | ||
16574dcc | 265 | /* let the kset specific function add its keys */ |
7eff2e7a | 266 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
16574dcc KS |
267 | if (retval) |
268 | goto out; | |
269 | ||
270 | /* copy keys to file */ | |
7eff2e7a KS |
271 | for (i = 0; i < env->envp_idx; i++) |
272 | count += sprintf(&buf[count], "%s\n", env->envp[i]); | |
16574dcc | 273 | out: |
7eff2e7a | 274 | kfree(env); |
16574dcc KS |
275 | return count; |
276 | } | |
277 | ||
a7fd6706 KS |
278 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
279 | const char *buf, size_t count) | |
280 | { | |
60a96a59 KS |
281 | enum kobject_action action; |
282 | ||
5c5daf65 | 283 | if (kobject_action_type(buf, count, &action) == 0) { |
60a96a59 KS |
284 | kobject_uevent(&dev->kobj, action); |
285 | goto out; | |
286 | } | |
287 | ||
288 | dev_err(dev, "uevent: unsupported action-string; this will " | |
289 | "be ignored in a future kernel version\n"); | |
312c004d | 290 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
60a96a59 | 291 | out: |
a7fd6706 KS |
292 | return count; |
293 | } | |
294 | ||
ad6a1e1c TH |
295 | static struct device_attribute uevent_attr = |
296 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); | |
297 | ||
621a1672 DT |
298 | static int device_add_attributes(struct device *dev, |
299 | struct device_attribute *attrs) | |
de0ff00d | 300 | { |
621a1672 | 301 | int error = 0; |
de0ff00d | 302 | int i; |
621a1672 DT |
303 | |
304 | if (attrs) { | |
305 | for (i = 0; attr_name(attrs[i]); i++) { | |
306 | error = device_create_file(dev, &attrs[i]); | |
307 | if (error) | |
308 | break; | |
309 | } | |
310 | if (error) | |
311 | while (--i >= 0) | |
312 | device_remove_file(dev, &attrs[i]); | |
313 | } | |
314 | return error; | |
315 | } | |
316 | ||
317 | static void device_remove_attributes(struct device *dev, | |
318 | struct device_attribute *attrs) | |
319 | { | |
320 | int i; | |
321 | ||
322 | if (attrs) | |
323 | for (i = 0; attr_name(attrs[i]); i++) | |
324 | device_remove_file(dev, &attrs[i]); | |
325 | } | |
326 | ||
327 | static int device_add_groups(struct device *dev, | |
328 | struct attribute_group **groups) | |
329 | { | |
de0ff00d | 330 | int error = 0; |
621a1672 | 331 | int i; |
de0ff00d | 332 | |
621a1672 DT |
333 | if (groups) { |
334 | for (i = 0; groups[i]; i++) { | |
335 | error = sysfs_create_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
336 | if (error) { |
337 | while (--i >= 0) | |
4a3ad20c GKH |
338 | sysfs_remove_group(&dev->kobj, |
339 | groups[i]); | |
621a1672 | 340 | break; |
de0ff00d GKH |
341 | } |
342 | } | |
343 | } | |
de0ff00d GKH |
344 | return error; |
345 | } | |
346 | ||
621a1672 DT |
347 | static void device_remove_groups(struct device *dev, |
348 | struct attribute_group **groups) | |
de0ff00d GKH |
349 | { |
350 | int i; | |
621a1672 DT |
351 | |
352 | if (groups) | |
353 | for (i = 0; groups[i]; i++) | |
354 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
355 | } |
356 | ||
2620efef GKH |
357 | static int device_add_attrs(struct device *dev) |
358 | { | |
359 | struct class *class = dev->class; | |
f9f852df | 360 | struct device_type *type = dev->type; |
621a1672 | 361 | int error; |
2620efef | 362 | |
621a1672 DT |
363 | if (class) { |
364 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 365 | if (error) |
621a1672 | 366 | return error; |
2620efef | 367 | } |
f9f852df | 368 | |
621a1672 DT |
369 | if (type) { |
370 | error = device_add_groups(dev, type->groups); | |
f9f852df | 371 | if (error) |
621a1672 | 372 | goto err_remove_class_attrs; |
f9f852df KS |
373 | } |
374 | ||
621a1672 DT |
375 | error = device_add_groups(dev, dev->groups); |
376 | if (error) | |
377 | goto err_remove_type_groups; | |
378 | ||
379 | return 0; | |
380 | ||
381 | err_remove_type_groups: | |
382 | if (type) | |
383 | device_remove_groups(dev, type->groups); | |
384 | err_remove_class_attrs: | |
385 | if (class) | |
386 | device_remove_attributes(dev, class->dev_attrs); | |
387 | ||
2620efef GKH |
388 | return error; |
389 | } | |
390 | ||
391 | static void device_remove_attrs(struct device *dev) | |
392 | { | |
393 | struct class *class = dev->class; | |
f9f852df | 394 | struct device_type *type = dev->type; |
2620efef | 395 | |
621a1672 | 396 | device_remove_groups(dev, dev->groups); |
f9f852df | 397 | |
621a1672 DT |
398 | if (type) |
399 | device_remove_groups(dev, type->groups); | |
400 | ||
401 | if (class) | |
402 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
403 | } |
404 | ||
405 | ||
23681e47 GKH |
406 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
407 | char *buf) | |
408 | { | |
409 | return print_dev_t(buf, dev->devt); | |
410 | } | |
411 | ||
ad6a1e1c TH |
412 | static struct device_attribute devt_attr = |
413 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
414 | ||
881c6cfd GKH |
415 | /* kset to create /sys/devices/ */ |
416 | struct kset *devices_kset; | |
1da177e4 | 417 | |
1da177e4 | 418 | /** |
4a3ad20c GKH |
419 | * device_create_file - create sysfs attribute file for device. |
420 | * @dev: device. | |
421 | * @attr: device attribute descriptor. | |
1da177e4 | 422 | */ |
4a3ad20c | 423 | int device_create_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
424 | { |
425 | int error = 0; | |
426 | if (get_device(dev)) { | |
427 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
428 | put_device(dev); | |
429 | } | |
430 | return error; | |
431 | } | |
432 | ||
433 | /** | |
4a3ad20c GKH |
434 | * device_remove_file - remove sysfs attribute file. |
435 | * @dev: device. | |
436 | * @attr: device attribute descriptor. | |
1da177e4 | 437 | */ |
4a3ad20c | 438 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
1da177e4 LT |
439 | { |
440 | if (get_device(dev)) { | |
441 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
442 | put_device(dev); | |
443 | } | |
444 | } | |
445 | ||
2589f188 GKH |
446 | /** |
447 | * device_create_bin_file - create sysfs binary attribute file for device. | |
448 | * @dev: device. | |
449 | * @attr: device binary attribute descriptor. | |
450 | */ | |
451 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
452 | { | |
453 | int error = -EINVAL; | |
454 | if (dev) | |
455 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
456 | return error; | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
459 | ||
460 | /** | |
461 | * device_remove_bin_file - remove sysfs binary attribute file | |
462 | * @dev: device. | |
463 | * @attr: device binary attribute descriptor. | |
464 | */ | |
465 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
466 | { | |
467 | if (dev) | |
468 | sysfs_remove_bin_file(&dev->kobj, attr); | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
471 | ||
d9a9cdfb | 472 | /** |
523ded71 | 473 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
474 | * @dev: device. |
475 | * @func: callback function to invoke later. | |
523ded71 | 476 | * @owner: module owning the callback routine |
d9a9cdfb AS |
477 | * |
478 | * Attribute methods must not unregister themselves or their parent device | |
479 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
480 | * since unregistration is mutually exclusive with driver callbacks. | |
481 | * | |
482 | * Instead methods can call this routine, which will attempt to allocate | |
483 | * and schedule a workqueue request to call back @func with @dev as its | |
484 | * argument in the workqueue's process context. @dev will be pinned until | |
485 | * @func returns. | |
486 | * | |
523ded71 AS |
487 | * This routine is usually called via the inline device_schedule_callback(), |
488 | * which automatically sets @owner to THIS_MODULE. | |
489 | * | |
d9a9cdfb | 490 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 491 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
492 | * |
493 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
494 | * underlying sysfs routine (since it is intended for use by attribute | |
495 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
496 | */ | |
523ded71 AS |
497 | int device_schedule_callback_owner(struct device *dev, |
498 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
499 | { |
500 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 501 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 502 | } |
523ded71 | 503 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 504 | |
34bb61f9 JB |
505 | static void klist_children_get(struct klist_node *n) |
506 | { | |
507 | struct device *dev = container_of(n, struct device, knode_parent); | |
508 | ||
509 | get_device(dev); | |
510 | } | |
511 | ||
512 | static void klist_children_put(struct klist_node *n) | |
513 | { | |
514 | struct device *dev = container_of(n, struct device, knode_parent); | |
515 | ||
516 | put_device(dev); | |
517 | } | |
518 | ||
1da177e4 | 519 | /** |
4a3ad20c GKH |
520 | * device_initialize - init device structure. |
521 | * @dev: device. | |
1da177e4 | 522 | * |
4a3ad20c GKH |
523 | * This prepares the device for use by other layers, |
524 | * including adding it to the device hierarchy. | |
525 | * It is the first half of device_register(), if called by | |
526 | * that, though it can also be called separately, so one | |
527 | * may use @dev's fields (e.g. the refcount). | |
1da177e4 | 528 | */ |
1da177e4 LT |
529 | void device_initialize(struct device *dev) |
530 | { | |
881c6cfd | 531 | dev->kobj.kset = devices_kset; |
f9cb074b | 532 | kobject_init(&dev->kobj, &device_ktype); |
34bb61f9 JB |
533 | klist_init(&dev->klist_children, klist_children_get, |
534 | klist_children_put); | |
1da177e4 | 535 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 536 | INIT_LIST_HEAD(&dev->node); |
af70316a | 537 | init_MUTEX(&dev->sem); |
9ac7849e TH |
538 | spin_lock_init(&dev->devres_lock); |
539 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 540 | device_init_wakeup(dev, 0); |
87348136 | 541 | set_dev_node(dev, -1); |
1da177e4 LT |
542 | } |
543 | ||
40fa5422 | 544 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
545 | static struct kobject *get_device_parent(struct device *dev, |
546 | struct device *parent) | |
40fa5422 | 547 | { |
da231fd5 | 548 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 549 | if (dev->class && (!parent || parent->class != dev->class)) |
823bccfc | 550 | return &dev->class->subsys.kobj; |
da231fd5 | 551 | /* all other devices keep their parent */ |
40fa5422 | 552 | else if (parent) |
c744aeae | 553 | return &parent->kobj; |
40fa5422 | 554 | |
c744aeae | 555 | return NULL; |
40fa5422 | 556 | } |
da231fd5 KS |
557 | |
558 | static inline void cleanup_device_parent(struct device *dev) {} | |
63b6971a CH |
559 | static inline void cleanup_glue_dir(struct device *dev, |
560 | struct kobject *glue_dir) {} | |
40fa5422 | 561 | #else |
86406245 | 562 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 563 | { |
86406245 | 564 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 565 | |
86406245 | 566 | if (!virtual_dir) |
4ff6abff | 567 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 568 | &devices_kset->kobj); |
f0ee61a6 | 569 | |
86406245 | 570 | return virtual_dir; |
f0ee61a6 GKH |
571 | } |
572 | ||
da231fd5 KS |
573 | static struct kobject *get_device_parent(struct device *dev, |
574 | struct device *parent) | |
40fa5422 | 575 | { |
43968d2f GKH |
576 | int retval; |
577 | ||
86406245 KS |
578 | if (dev->class) { |
579 | struct kobject *kobj = NULL; | |
580 | struct kobject *parent_kobj; | |
581 | struct kobject *k; | |
582 | ||
583 | /* | |
584 | * If we have no parent, we live in "virtual". | |
0f4dafc0 KS |
585 | * Class-devices with a non class-device as parent, live |
586 | * in a "glue" directory to prevent namespace collisions. | |
86406245 KS |
587 | */ |
588 | if (parent == NULL) | |
589 | parent_kobj = virtual_device_parent(dev); | |
590 | else if (parent->class) | |
591 | return &parent->kobj; | |
592 | else | |
593 | parent_kobj = &parent->kobj; | |
594 | ||
595 | /* find our class-directory at the parent and reference it */ | |
596 | spin_lock(&dev->class->class_dirs.list_lock); | |
597 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
598 | if (k->parent == parent_kobj) { | |
599 | kobj = kobject_get(k); | |
600 | break; | |
601 | } | |
602 | spin_unlock(&dev->class->class_dirs.list_lock); | |
603 | if (kobj) | |
604 | return kobj; | |
605 | ||
606 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
607 | k = kobject_create(); |
608 | if (!k) | |
609 | return NULL; | |
610 | k->kset = &dev->class->class_dirs; | |
b2d6db58 | 611 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
43968d2f GKH |
612 | if (retval < 0) { |
613 | kobject_put(k); | |
614 | return NULL; | |
615 | } | |
0f4dafc0 | 616 | /* do not emit an uevent for this simple "glue" directory */ |
43968d2f | 617 | return k; |
86406245 KS |
618 | } |
619 | ||
620 | if (parent) | |
c744aeae CH |
621 | return &parent->kobj; |
622 | return NULL; | |
623 | } | |
da231fd5 | 624 | |
63b6971a | 625 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5 | 626 | { |
0f4dafc0 KS |
627 | /* see if we live in a "glue" directory */ |
628 | if (!dev->class || glue_dir->kset != &dev->class->class_dirs) | |
da231fd5 KS |
629 | return; |
630 | ||
0f4dafc0 | 631 | kobject_put(glue_dir); |
da231fd5 | 632 | } |
63b6971a CH |
633 | |
634 | static void cleanup_device_parent(struct device *dev) | |
635 | { | |
636 | cleanup_glue_dir(dev, dev->kobj.parent); | |
637 | } | |
c744aeae | 638 | #endif |
86406245 | 639 | |
63b6971a | 640 | static void setup_parent(struct device *dev, struct device *parent) |
c744aeae CH |
641 | { |
642 | struct kobject *kobj; | |
643 | kobj = get_device_parent(dev, parent); | |
c744aeae CH |
644 | if (kobj) |
645 | dev->kobj.parent = kobj; | |
40fa5422 | 646 | } |
40fa5422 | 647 | |
2ee97caf CH |
648 | static int device_add_class_symlinks(struct device *dev) |
649 | { | |
650 | int error; | |
651 | ||
652 | if (!dev->class) | |
653 | return 0; | |
da231fd5 | 654 | |
2ee97caf CH |
655 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, |
656 | "subsystem"); | |
657 | if (error) | |
658 | goto out; | |
da231fd5 KS |
659 | |
660 | #ifdef CONFIG_SYSFS_DEPRECATED | |
661 | /* stacked class devices need a symlink in the class directory */ | |
edfaa7c3 | 662 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
4e886c29 | 663 | device_is_not_partition(dev)) { |
2ee97caf CH |
664 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
665 | dev->bus_id); | |
666 | if (error) | |
667 | goto out_subsys; | |
668 | } | |
da231fd5 | 669 | |
4e886c29 | 670 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
671 | struct device *parent = dev->parent; |
672 | char *class_name; | |
4f01a757 | 673 | |
da231fd5 KS |
674 | /* |
675 | * stacked class devices have the 'device' link | |
676 | * pointing to the bus device instead of the parent | |
677 | */ | |
678 | while (parent->class && !parent->bus && parent->parent) | |
679 | parent = parent->parent; | |
680 | ||
681 | error = sysfs_create_link(&dev->kobj, | |
682 | &parent->kobj, | |
4f01a757 DT |
683 | "device"); |
684 | if (error) | |
685 | goto out_busid; | |
da231fd5 KS |
686 | |
687 | class_name = make_class_name(dev->class->name, | |
688 | &dev->kobj); | |
689 | if (class_name) | |
690 | error = sysfs_create_link(&dev->parent->kobj, | |
691 | &dev->kobj, class_name); | |
692 | kfree(class_name); | |
693 | if (error) | |
694 | goto out_device; | |
2ee97caf CH |
695 | } |
696 | return 0; | |
697 | ||
2ee97caf | 698 | out_device: |
4e886c29 | 699 | if (dev->parent && device_is_not_partition(dev)) |
2ee97caf | 700 | sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf | 701 | out_busid: |
edfaa7c3 | 702 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
4e886c29 | 703 | device_is_not_partition(dev)) |
2ee97caf | 704 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
da231fd5 KS |
705 | #else |
706 | /* link in the class directory pointing to the device */ | |
707 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
708 | dev->bus_id); | |
709 | if (error) | |
710 | goto out_subsys; | |
711 | ||
4e886c29 | 712 | if (dev->parent && device_is_not_partition(dev)) { |
da231fd5 KS |
713 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
714 | "device"); | |
715 | if (error) | |
716 | goto out_busid; | |
717 | } | |
718 | return 0; | |
719 | ||
720 | out_busid: | |
721 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
722 | #endif | |
723 | ||
2ee97caf CH |
724 | out_subsys: |
725 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
726 | out: | |
727 | return error; | |
728 | } | |
729 | ||
730 | static void device_remove_class_symlinks(struct device *dev) | |
731 | { | |
732 | if (!dev->class) | |
733 | return; | |
da231fd5 | 734 | |
2ee97caf | 735 | #ifdef CONFIG_SYSFS_DEPRECATED |
4e886c29 | 736 | if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf CH |
737 | char *class_name; |
738 | ||
739 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
740 | if (class_name) { | |
741 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
742 | kfree(class_name); | |
743 | } | |
2ee97caf CH |
744 | sysfs_remove_link(&dev->kobj, "device"); |
745 | } | |
da231fd5 | 746 | |
edfaa7c3 | 747 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
4e886c29 | 748 | device_is_not_partition(dev)) |
2ee97caf | 749 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
da231fd5 | 750 | #else |
4e886c29 | 751 | if (dev->parent && device_is_not_partition(dev)) |
da231fd5 KS |
752 | sysfs_remove_link(&dev->kobj, "device"); |
753 | ||
754 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
755 | #endif | |
756 | ||
2ee97caf CH |
757 | sysfs_remove_link(&dev->kobj, "subsystem"); |
758 | } | |
759 | ||
1da177e4 | 760 | /** |
4a3ad20c GKH |
761 | * device_add - add device to device hierarchy. |
762 | * @dev: device. | |
1da177e4 | 763 | * |
4a3ad20c GKH |
764 | * This is part 2 of device_register(), though may be called |
765 | * separately _iff_ device_initialize() has been called separately. | |
1da177e4 | 766 | * |
4a3ad20c GKH |
767 | * This adds it to the kobject hierarchy via kobject_add(), adds it |
768 | * to the global and sibling lists for the device, then | |
769 | * adds it to the other relevant subsystems of the driver model. | |
1da177e4 LT |
770 | */ |
771 | int device_add(struct device *dev) | |
772 | { | |
773 | struct device *parent = NULL; | |
c47ed219 | 774 | struct class_interface *class_intf; |
775b64d2 RW |
775 | int error; |
776 | ||
777 | error = pm_sleep_lock(); | |
778 | if (error) { | |
779 | dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__); | |
780 | dump_stack(); | |
781 | return error; | |
782 | } | |
1da177e4 LT |
783 | |
784 | dev = get_device(dev); | |
775b64d2 RW |
785 | if (!dev || !strlen(dev->bus_id)) { |
786 | error = -EINVAL; | |
1da177e4 | 787 | goto Error; |
775b64d2 | 788 | } |
1da177e4 | 789 | |
7dc72b28 | 790 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
c205ef48 | 791 | |
1da177e4 | 792 | parent = get_device(dev->parent); |
63b6971a | 793 | setup_parent(dev, parent); |
1da177e4 LT |
794 | |
795 | /* first, register with generic layer. */ | |
b2d6db58 | 796 | error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
40fa5422 | 797 | if (error) |
1da177e4 | 798 | goto Error; |
a7fd6706 | 799 | |
37022644 BW |
800 | /* notify platform of device entry */ |
801 | if (platform_notify) | |
802 | platform_notify(dev); | |
803 | ||
116af378 BH |
804 | /* notify clients of device entry (new way) */ |
805 | if (dev->bus) | |
c6f7e72a | 806 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
807 | BUS_NOTIFY_ADD_DEVICE, dev); |
808 | ||
ad6a1e1c | 809 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
810 | if (error) |
811 | goto attrError; | |
a7fd6706 | 812 | |
23681e47 | 813 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
814 | error = device_create_file(dev, &devt_attr); |
815 | if (error) | |
a306eea4 | 816 | goto ueventattrError; |
23681e47 GKH |
817 | } |
818 | ||
2ee97caf CH |
819 | error = device_add_class_symlinks(dev); |
820 | if (error) | |
821 | goto SymlinkError; | |
dc0afa83 CH |
822 | error = device_add_attrs(dev); |
823 | if (error) | |
2620efef | 824 | goto AttrsError; |
dec13c15 | 825 | error = dpm_sysfs_add(dev); |
dc0afa83 | 826 | if (error) |
1da177e4 | 827 | goto PMError; |
dec13c15 | 828 | device_pm_add(dev); |
dc0afa83 CH |
829 | error = bus_add_device(dev); |
830 | if (error) | |
1da177e4 | 831 | goto BusError; |
83b5fb4c | 832 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 833 | bus_attach_device(dev); |
1da177e4 | 834 | if (parent) |
d856f1e3 | 835 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 836 | |
5d9fd169 | 837 | if (dev->class) { |
5d9fd169 | 838 | down(&dev->class->sem); |
c47ed219 | 839 | /* tie the class to the device */ |
5d9fd169 | 840 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
841 | |
842 | /* notify any interfaces that the device is here */ | |
843 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
844 | if (class_intf->add_dev) | |
845 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
846 | up(&dev->class->sem); |
847 | } | |
1da177e4 LT |
848 | Done: |
849 | put_device(dev); | |
775b64d2 | 850 | pm_sleep_unlock(); |
1da177e4 LT |
851 | return error; |
852 | BusError: | |
853 | device_pm_remove(dev); | |
dec13c15 | 854 | dpm_sysfs_remove(dev); |
1da177e4 | 855 | PMError: |
116af378 | 856 | if (dev->bus) |
c6f7e72a | 857 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 858 | BUS_NOTIFY_DEL_DEVICE, dev); |
82f0cf9b | 859 | device_remove_attrs(dev); |
2620efef | 860 | AttrsError: |
2ee97caf CH |
861 | device_remove_class_symlinks(dev); |
862 | SymlinkError: | |
ad6a1e1c TH |
863 | if (MAJOR(dev->devt)) |
864 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 865 | ueventattrError: |
ad6a1e1c | 866 | device_remove_file(dev, &uevent_attr); |
23681e47 | 867 | attrError: |
312c004d | 868 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
869 | kobject_del(&dev->kobj); |
870 | Error: | |
63b6971a | 871 | cleanup_device_parent(dev); |
1da177e4 LT |
872 | if (parent) |
873 | put_device(parent); | |
874 | goto Done; | |
875 | } | |
876 | ||
1da177e4 | 877 | /** |
4a3ad20c GKH |
878 | * device_register - register a device with the system. |
879 | * @dev: pointer to the device structure | |
1da177e4 | 880 | * |
4a3ad20c GKH |
881 | * This happens in two clean steps - initialize the device |
882 | * and add it to the system. The two steps can be called | |
883 | * separately, but this is the easiest and most common. | |
884 | * I.e. you should only call the two helpers separately if | |
885 | * have a clearly defined need to use and refcount the device | |
886 | * before it is added to the hierarchy. | |
1da177e4 | 887 | */ |
1da177e4 LT |
888 | int device_register(struct device *dev) |
889 | { | |
890 | device_initialize(dev); | |
891 | return device_add(dev); | |
892 | } | |
893 | ||
1da177e4 | 894 | /** |
4a3ad20c GKH |
895 | * get_device - increment reference count for device. |
896 | * @dev: device. | |
1da177e4 | 897 | * |
4a3ad20c GKH |
898 | * This simply forwards the call to kobject_get(), though |
899 | * we do take care to provide for the case that we get a NULL | |
900 | * pointer passed in. | |
1da177e4 | 901 | */ |
4a3ad20c | 902 | struct device *get_device(struct device *dev) |
1da177e4 LT |
903 | { |
904 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
905 | } | |
906 | ||
1da177e4 | 907 | /** |
4a3ad20c GKH |
908 | * put_device - decrement reference count. |
909 | * @dev: device in question. | |
1da177e4 | 910 | */ |
4a3ad20c | 911 | void put_device(struct device *dev) |
1da177e4 | 912 | { |
edfaa7c3 | 913 | /* might_sleep(); */ |
1da177e4 LT |
914 | if (dev) |
915 | kobject_put(&dev->kobj); | |
916 | } | |
917 | ||
1da177e4 | 918 | /** |
4a3ad20c GKH |
919 | * device_del - delete device from system. |
920 | * @dev: device. | |
1da177e4 | 921 | * |
4a3ad20c GKH |
922 | * This is the first part of the device unregistration |
923 | * sequence. This removes the device from the lists we control | |
924 | * from here, has it removed from the other driver model | |
925 | * subsystems it was added to in device_add(), and removes it | |
926 | * from the kobject hierarchy. | |
1da177e4 | 927 | * |
4a3ad20c GKH |
928 | * NOTE: this should be called manually _iff_ device_add() was |
929 | * also called manually. | |
1da177e4 | 930 | */ |
4a3ad20c | 931 | void device_del(struct device *dev) |
1da177e4 | 932 | { |
4a3ad20c | 933 | struct device *parent = dev->parent; |
c47ed219 | 934 | struct class_interface *class_intf; |
1da177e4 | 935 | |
775b64d2 | 936 | device_pm_remove(dev); |
1da177e4 | 937 | if (parent) |
d62c0f9f | 938 | klist_del(&dev->knode_parent); |
ad6a1e1c TH |
939 | if (MAJOR(dev->devt)) |
940 | device_remove_file(dev, &devt_attr); | |
b9d9c82b | 941 | if (dev->class) { |
da231fd5 | 942 | device_remove_class_symlinks(dev); |
99ef3ef8 | 943 | |
5d9fd169 | 944 | down(&dev->class->sem); |
c47ed219 GKH |
945 | /* notify any interfaces that the device is now gone */ |
946 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
947 | if (class_intf->remove_dev) | |
948 | class_intf->remove_dev(dev, class_intf); | |
949 | /* remove the device from the class list */ | |
5d9fd169 GKH |
950 | list_del_init(&dev->node); |
951 | up(&dev->class->sem); | |
b9d9c82b | 952 | } |
ad6a1e1c | 953 | device_remove_file(dev, &uevent_attr); |
2620efef | 954 | device_remove_attrs(dev); |
28953533 | 955 | bus_remove_device(dev); |
1da177e4 | 956 | |
2f8d16a9 TH |
957 | /* |
958 | * Some platform devices are driven without driver attached | |
959 | * and managed resources may have been acquired. Make sure | |
960 | * all resources are released. | |
961 | */ | |
962 | devres_release_all(dev); | |
963 | ||
1da177e4 LT |
964 | /* Notify the platform of the removal, in case they |
965 | * need to do anything... | |
966 | */ | |
967 | if (platform_notify_remove) | |
968 | platform_notify_remove(dev); | |
116af378 | 969 | if (dev->bus) |
c6f7e72a | 970 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 971 | BUS_NOTIFY_DEL_DEVICE, dev); |
312c004d | 972 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 973 | cleanup_device_parent(dev); |
1da177e4 | 974 | kobject_del(&dev->kobj); |
da231fd5 | 975 | put_device(parent); |
1da177e4 LT |
976 | } |
977 | ||
978 | /** | |
4a3ad20c GKH |
979 | * device_unregister - unregister device from system. |
980 | * @dev: device going away. | |
1da177e4 | 981 | * |
4a3ad20c GKH |
982 | * We do this in two parts, like we do device_register(). First, |
983 | * we remove it from all the subsystems with device_del(), then | |
984 | * we decrement the reference count via put_device(). If that | |
985 | * is the final reference count, the device will be cleaned up | |
986 | * via device_release() above. Otherwise, the structure will | |
987 | * stick around until the final reference to the device is dropped. | |
1da177e4 | 988 | */ |
4a3ad20c | 989 | void device_unregister(struct device *dev) |
1da177e4 | 990 | { |
7dc72b28 | 991 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
1da177e4 LT |
992 | device_del(dev); |
993 | put_device(dev); | |
994 | } | |
995 | ||
4a3ad20c | 996 | static struct device *next_device(struct klist_iter *i) |
36239577 | 997 | { |
4a3ad20c | 998 | struct klist_node *n = klist_next(i); |
36239577 | 999 | return n ? container_of(n, struct device, knode_parent) : NULL; |
1000 | } | |
1001 | ||
1da177e4 | 1002 | /** |
4a3ad20c GKH |
1003 | * device_for_each_child - device child iterator. |
1004 | * @parent: parent struct device. | |
1005 | * @data: data for the callback. | |
1006 | * @fn: function to be called for each device. | |
1da177e4 | 1007 | * |
4a3ad20c GKH |
1008 | * Iterate over @parent's child devices, and call @fn for each, |
1009 | * passing it @data. | |
1da177e4 | 1010 | * |
4a3ad20c GKH |
1011 | * We check the return of @fn each time. If it returns anything |
1012 | * other than 0, we break out and return that value. | |
1da177e4 | 1013 | */ |
4a3ad20c GKH |
1014 | int device_for_each_child(struct device *parent, void *data, |
1015 | int (*fn)(struct device *dev, void *data)) | |
1da177e4 | 1016 | { |
36239577 | 1017 | struct klist_iter i; |
4a3ad20c | 1018 | struct device *child; |
1da177e4 LT |
1019 | int error = 0; |
1020 | ||
36239577 | 1021 | klist_iter_init(&parent->klist_children, &i); |
1022 | while ((child = next_device(&i)) && !error) | |
1023 | error = fn(child, data); | |
1024 | klist_iter_exit(&i); | |
1da177e4 LT |
1025 | return error; |
1026 | } | |
1027 | ||
5ab69981 CH |
1028 | /** |
1029 | * device_find_child - device iterator for locating a particular device. | |
1030 | * @parent: parent struct device | |
1031 | * @data: Data to pass to match function | |
1032 | * @match: Callback function to check device | |
1033 | * | |
1034 | * This is similar to the device_for_each_child() function above, but it | |
1035 | * returns a reference to a device that is 'found' for later use, as | |
1036 | * determined by the @match callback. | |
1037 | * | |
1038 | * The callback should return 0 if the device doesn't match and non-zero | |
1039 | * if it does. If the callback returns non-zero and a reference to the | |
1040 | * current device can be obtained, this function will return to the caller | |
1041 | * and not iterate over any more devices. | |
1042 | */ | |
4a3ad20c GKH |
1043 | struct device *device_find_child(struct device *parent, void *data, |
1044 | int (*match)(struct device *dev, void *data)) | |
5ab69981 CH |
1045 | { |
1046 | struct klist_iter i; | |
1047 | struct device *child; | |
1048 | ||
1049 | if (!parent) | |
1050 | return NULL; | |
1051 | ||
1052 | klist_iter_init(&parent->klist_children, &i); | |
1053 | while ((child = next_device(&i))) | |
1054 | if (match(child, data) && get_device(child)) | |
1055 | break; | |
1056 | klist_iter_exit(&i); | |
1057 | return child; | |
1058 | } | |
1059 | ||
1da177e4 LT |
1060 | int __init devices_init(void) |
1061 | { | |
881c6cfd GKH |
1062 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1063 | if (!devices_kset) | |
1064 | return -ENOMEM; | |
1065 | return 0; | |
1da177e4 LT |
1066 | } |
1067 | ||
1068 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1069 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1070 | |
1071 | EXPORT_SYMBOL_GPL(device_initialize); | |
1072 | EXPORT_SYMBOL_GPL(device_add); | |
1073 | EXPORT_SYMBOL_GPL(device_register); | |
1074 | ||
1075 | EXPORT_SYMBOL_GPL(device_del); | |
1076 | EXPORT_SYMBOL_GPL(device_unregister); | |
1077 | EXPORT_SYMBOL_GPL(get_device); | |
1078 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1079 | |
1080 | EXPORT_SYMBOL_GPL(device_create_file); | |
1081 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1082 | |
1083 | ||
1084 | static void device_create_release(struct device *dev) | |
1085 | { | |
7dc72b28 | 1086 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
23681e47 GKH |
1087 | kfree(dev); |
1088 | } | |
1089 | ||
1090 | /** | |
1091 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1092 | * @class: pointer to the struct class that this device should be registered to |
1093 | * @parent: pointer to the parent struct device of this new device, if any | |
1094 | * @devt: the dev_t for the char device to be added | |
1095 | * @fmt: string for the device's name | |
1096 | * | |
1097 | * This function can be used by char device classes. A struct device | |
1098 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1099 | * |
23681e47 GKH |
1100 | * A "dev" file will be created, showing the dev_t for the device, if |
1101 | * the dev_t is not 0,0. | |
42734daf HK |
1102 | * If a pointer to a parent struct device is passed in, the newly created |
1103 | * struct device will be a child of that device in sysfs. | |
1104 | * The pointer to the struct device will be returned from the call. | |
1105 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1106 | * pointer. |
1107 | * | |
1108 | * Note: the struct class passed to this function must have previously | |
1109 | * been created with a call to class_create(). | |
1110 | */ | |
1111 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1112 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1113 | { |
1114 | va_list args; | |
1115 | struct device *dev = NULL; | |
1116 | int retval = -ENODEV; | |
1117 | ||
1118 | if (class == NULL || IS_ERR(class)) | |
1119 | goto error; | |
23681e47 GKH |
1120 | |
1121 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1122 | if (!dev) { | |
1123 | retval = -ENOMEM; | |
1124 | goto error; | |
1125 | } | |
1126 | ||
1127 | dev->devt = devt; | |
1128 | dev->class = class; | |
1129 | dev->parent = parent; | |
1130 | dev->release = device_create_release; | |
1131 | ||
1132 | va_start(args, fmt); | |
1133 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1134 | va_end(args); | |
1135 | retval = device_register(dev); | |
1136 | if (retval) | |
1137 | goto error; | |
1138 | ||
23681e47 GKH |
1139 | return dev; |
1140 | ||
1141 | error: | |
1142 | kfree(dev); | |
1143 | return ERR_PTR(retval); | |
1144 | } | |
1145 | EXPORT_SYMBOL_GPL(device_create); | |
1146 | ||
1147 | /** | |
775b64d2 | 1148 | * find_device - finds a device that was created with device_create() |
42734daf HK |
1149 | * @class: pointer to the struct class that this device was registered with |
1150 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 1151 | */ |
775b64d2 | 1152 | static struct device *find_device(struct class *class, dev_t devt) |
23681e47 GKH |
1153 | { |
1154 | struct device *dev = NULL; | |
1155 | struct device *dev_tmp; | |
1156 | ||
1157 | down(&class->sem); | |
1158 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1159 | if (dev_tmp->devt == devt) { | |
1160 | dev = dev_tmp; | |
1161 | break; | |
1162 | } | |
1163 | } | |
1164 | up(&class->sem); | |
775b64d2 RW |
1165 | return dev; |
1166 | } | |
1167 | ||
1168 | /** | |
1169 | * device_destroy - removes a device that was created with device_create() | |
1170 | * @class: pointer to the struct class that this device was registered with | |
1171 | * @devt: the dev_t of the device that was previously registered | |
1172 | * | |
1173 | * This call unregisters and cleans up a device that was created with a | |
1174 | * call to device_create(). | |
1175 | */ | |
1176 | void device_destroy(struct class *class, dev_t devt) | |
1177 | { | |
1178 | struct device *dev; | |
23681e47 | 1179 | |
775b64d2 | 1180 | dev = find_device(class, devt); |
5d9fd169 | 1181 | if (dev) |
23681e47 | 1182 | device_unregister(dev); |
23681e47 GKH |
1183 | } |
1184 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca | 1185 | |
775b64d2 RW |
1186 | #ifdef CONFIG_PM_SLEEP |
1187 | /** | |
1188 | * destroy_suspended_device - asks the PM core to remove a suspended device | |
1189 | * @class: pointer to the struct class that this device was registered with | |
1190 | * @devt: the dev_t of the device that was previously registered | |
1191 | * | |
1192 | * This call notifies the PM core of the necessity to unregister a suspended | |
1193 | * device created with a call to device_create() (devices cannot be | |
1194 | * unregistered directly while suspended, since the PM core holds their | |
1195 | * semaphores at that time). | |
1196 | * | |
1197 | * It can only be called within the scope of a system sleep transition. In | |
1198 | * practice this means it has to be directly or indirectly invoked either by | |
1199 | * a suspend or resume method, or by the PM core (e.g. via | |
1200 | * disable_nonboot_cpus() or enable_nonboot_cpus()). | |
1201 | */ | |
1202 | void destroy_suspended_device(struct class *class, dev_t devt) | |
1203 | { | |
1204 | struct device *dev; | |
1205 | ||
1206 | dev = find_device(class, devt); | |
1207 | if (dev) | |
1208 | device_pm_schedule_removal(dev); | |
1209 | } | |
1210 | EXPORT_SYMBOL_GPL(destroy_suspended_device); | |
1211 | #endif /* CONFIG_PM_SLEEP */ | |
1212 | ||
a2de48ca GKH |
1213 | /** |
1214 | * device_rename - renames a device | |
1215 | * @dev: the pointer to the struct device to be renamed | |
1216 | * @new_name: the new name of the device | |
1217 | */ | |
1218 | int device_rename(struct device *dev, char *new_name) | |
1219 | { | |
1220 | char *old_class_name = NULL; | |
1221 | char *new_class_name = NULL; | |
2ee97caf | 1222 | char *old_device_name = NULL; |
a2de48ca GKH |
1223 | int error; |
1224 | ||
1225 | dev = get_device(dev); | |
1226 | if (!dev) | |
1227 | return -EINVAL; | |
1228 | ||
7dc72b28 GKH |
1229 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
1230 | __FUNCTION__, new_name); | |
a2de48ca | 1231 | |
99ef3ef8 | 1232 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1233 | if ((dev->class) && (dev->parent)) |
1234 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1235 | #endif |
a2de48ca | 1236 | |
2ee97caf CH |
1237 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1238 | if (!old_device_name) { | |
1239 | error = -ENOMEM; | |
1240 | goto out; | |
a2de48ca | 1241 | } |
2ee97caf | 1242 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1243 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1244 | ||
1245 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1246 | if (error) { |
1247 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1248 | goto out; | |
1249 | } | |
a2de48ca | 1250 | |
99ef3ef8 | 1251 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1252 | if (old_class_name) { |
1253 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1254 | if (new_class_name) { | |
2ee97caf CH |
1255 | error = sysfs_create_link(&dev->parent->kobj, |
1256 | &dev->kobj, new_class_name); | |
1257 | if (error) | |
1258 | goto out; | |
a2de48ca GKH |
1259 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1260 | } | |
1261 | } | |
60b8cabd | 1262 | #else |
a2de48ca | 1263 | if (dev->class) { |
2ee97caf CH |
1264 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
1265 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
1266 | dev->bus_id); | |
1267 | if (error) { | |
2ee97caf CH |
1268 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", |
1269 | __FUNCTION__, error); | |
1270 | } | |
a2de48ca | 1271 | } |
60b8cabd KS |
1272 | #endif |
1273 | ||
2ee97caf | 1274 | out: |
a2de48ca GKH |
1275 | put_device(dev); |
1276 | ||
a2de48ca | 1277 | kfree(new_class_name); |
952ab431 | 1278 | kfree(old_class_name); |
2ee97caf | 1279 | kfree(old_device_name); |
a2de48ca GKH |
1280 | |
1281 | return error; | |
1282 | } | |
a2807dbc | 1283 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1284 | |
1285 | static int device_move_class_links(struct device *dev, | |
1286 | struct device *old_parent, | |
1287 | struct device *new_parent) | |
1288 | { | |
f7f3461d | 1289 | int error = 0; |
8a82472f | 1290 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1291 | char *class_name; |
1292 | ||
1293 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1294 | if (!class_name) { | |
cb360bbf | 1295 | error = -ENOMEM; |
8a82472f CH |
1296 | goto out; |
1297 | } | |
1298 | if (old_parent) { | |
1299 | sysfs_remove_link(&dev->kobj, "device"); | |
1300 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1301 | } | |
c744aeae CH |
1302 | if (new_parent) { |
1303 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1304 | "device"); | |
1305 | if (error) | |
1306 | goto out; | |
1307 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1308 | class_name); | |
1309 | if (error) | |
1310 | sysfs_remove_link(&dev->kobj, "device"); | |
4a3ad20c | 1311 | } else |
c744aeae | 1312 | error = 0; |
8a82472f CH |
1313 | out: |
1314 | kfree(class_name); | |
1315 | return error; | |
1316 | #else | |
f7f3461d GKH |
1317 | if (old_parent) |
1318 | sysfs_remove_link(&dev->kobj, "device"); | |
1319 | if (new_parent) | |
1320 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1321 | "device"); | |
1322 | return error; | |
8a82472f CH |
1323 | #endif |
1324 | } | |
1325 | ||
1326 | /** | |
1327 | * device_move - moves a device to a new parent | |
1328 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1329 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1330 | */ |
1331 | int device_move(struct device *dev, struct device *new_parent) | |
1332 | { | |
1333 | int error; | |
1334 | struct device *old_parent; | |
c744aeae | 1335 | struct kobject *new_parent_kobj; |
8a82472f CH |
1336 | |
1337 | dev = get_device(dev); | |
1338 | if (!dev) | |
1339 | return -EINVAL; | |
1340 | ||
8a82472f | 1341 | new_parent = get_device(new_parent); |
4a3ad20c | 1342 | new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a | 1343 | |
7dc72b28 GKH |
1344 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
1345 | __FUNCTION__, new_parent ? new_parent->bus_id : "<NULL>"); | |
c744aeae | 1346 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f | 1347 | if (error) { |
63b6971a | 1348 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1349 | put_device(new_parent); |
1350 | goto out; | |
1351 | } | |
1352 | old_parent = dev->parent; | |
1353 | dev->parent = new_parent; | |
1354 | if (old_parent) | |
acf02d23 | 1355 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1356 | if (new_parent) |
1357 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1358 | if (!dev->class) |
1359 | goto out_put; | |
1360 | error = device_move_class_links(dev, old_parent, new_parent); | |
1361 | if (error) { | |
1362 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1363 | device_move_class_links(dev, new_parent, old_parent); | |
1364 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1365 | if (new_parent) |
1366 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1367 | if (old_parent) |
1368 | klist_add_tail(&dev->knode_parent, | |
1369 | &old_parent->klist_children); | |
1370 | } | |
63b6971a | 1371 | cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f CH |
1372 | put_device(new_parent); |
1373 | goto out; | |
1374 | } | |
1375 | out_put: | |
1376 | put_device(old_parent); | |
1377 | out: | |
1378 | put_device(dev); | |
1379 | return error; | |
1380 | } | |
8a82472f | 1381 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1382 | |
1383 | /** | |
1384 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1385 | */ | |
1386 | void device_shutdown(void) | |
1387 | { | |
4a3ad20c | 1388 | struct device *dev, *devn; |
37b0c020 GKH |
1389 | |
1390 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1391 | kobj.entry) { | |
1392 | if (dev->bus && dev->bus->shutdown) { | |
1393 | dev_dbg(dev, "shutdown\n"); | |
1394 | dev->bus->shutdown(dev); | |
1395 | } else if (dev->driver && dev->driver->shutdown) { | |
1396 | dev_dbg(dev, "shutdown\n"); | |
1397 | dev->driver->shutdown(dev); | |
1398 | } | |
1399 | } | |
1400 | } |