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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/base/core.c - core driver model code (device registration, etc) | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
64bb5d2c GKH |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2006 Novell, Inc. | |
1da177e4 LT |
8 | * |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/device.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/string.h> | |
23681e47 | 19 | #include <linux/kdev_t.h> |
116af378 | 20 | #include <linux/notifier.h> |
da231fd5 | 21 | #include <linux/genhd.h> |
1da177e4 LT |
22 | #include <asm/semaphore.h> |
23 | ||
24 | #include "base.h" | |
25 | #include "power/power.h" | |
26 | ||
27 | int (*platform_notify)(struct device * dev) = NULL; | |
28 | int (*platform_notify_remove)(struct device * dev) = NULL; | |
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 | ||
1da177e4 LT |
54 | static ssize_t |
55 | dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
56 | { | |
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 | ||
66 | static ssize_t | |
67 | dev_attr_store(struct kobject * kobj, struct attribute * attr, | |
68 | const char * buf, size_t count) | |
69 | { | |
70 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
71 | struct device * dev = to_dev(kobj); | |
4a0c20bf | 72 | ssize_t ret = -EIO; |
1da177e4 LT |
73 | |
74 | if (dev_attr->store) | |
54b6f35c | 75 | ret = dev_attr->store(dev, dev_attr, buf, count); |
1da177e4 LT |
76 | return ret; |
77 | } | |
78 | ||
79 | static struct sysfs_ops dev_sysfs_ops = { | |
80 | .show = dev_attr_show, | |
81 | .store = dev_attr_store, | |
82 | }; | |
83 | ||
84 | ||
85 | /** | |
86 | * device_release - free device structure. | |
87 | * @kobj: device's kobject. | |
88 | * | |
89 | * This is called once the reference count for the object | |
90 | * reaches 0. We forward the call to the device's release | |
91 | * method, which should handle actually freeing the structure. | |
92 | */ | |
93 | static void device_release(struct kobject * kobj) | |
94 | { | |
95 | struct device * dev = to_dev(kobj); | |
96 | ||
97 | if (dev->release) | |
98 | dev->release(dev); | |
f9f852df KS |
99 | else if (dev->type && dev->type->release) |
100 | dev->type->release(dev); | |
2620efef GKH |
101 | else if (dev->class && dev->class->dev_release) |
102 | dev->class->dev_release(dev); | |
1da177e4 LT |
103 | else { |
104 | printk(KERN_ERR "Device '%s' does not have a release() function, " | |
105 | "it is broken and must be fixed.\n", | |
106 | dev->bus_id); | |
107 | WARN_ON(1); | |
108 | } | |
109 | } | |
110 | ||
8f4afc41 | 111 | static struct kobj_type device_ktype = { |
1da177e4 LT |
112 | .release = device_release, |
113 | .sysfs_ops = &dev_sysfs_ops, | |
1da177e4 LT |
114 | }; |
115 | ||
116 | ||
312c004d | 117 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
118 | { |
119 | struct kobj_type *ktype = get_ktype(kobj); | |
120 | ||
8f4afc41 | 121 | if (ktype == &device_ktype) { |
1da177e4 | 122 | struct device *dev = to_dev(kobj); |
83b5fb4c CH |
123 | if (dev->uevent_suppress) |
124 | return 0; | |
1da177e4 LT |
125 | if (dev->bus) |
126 | return 1; | |
23681e47 GKH |
127 | if (dev->class) |
128 | return 1; | |
1da177e4 LT |
129 | } |
130 | return 0; | |
131 | } | |
132 | ||
312c004d | 133 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
1da177e4 LT |
134 | { |
135 | struct device *dev = to_dev(kobj); | |
136 | ||
23681e47 GKH |
137 | if (dev->bus) |
138 | return dev->bus->name; | |
139 | if (dev->class) | |
140 | return dev->class->name; | |
141 | return NULL; | |
1da177e4 LT |
142 | } |
143 | ||
7eff2e7a KS |
144 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
145 | struct kobj_uevent_env *env) | |
1da177e4 LT |
146 | { |
147 | struct device *dev = to_dev(kobj); | |
1da177e4 LT |
148 | int retval = 0; |
149 | ||
23681e47 GKH |
150 | /* add the major/minor if present */ |
151 | if (MAJOR(dev->devt)) { | |
7eff2e7a KS |
152 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
153 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); | |
23681e47 GKH |
154 | } |
155 | ||
414264f9 | 156 | if (dev->type && dev->type->name) |
7eff2e7a | 157 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
414264f9 | 158 | |
239378f1 | 159 | if (dev->driver) |
7eff2e7a | 160 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
239378f1 | 161 | |
a87cb2ac | 162 | #ifdef CONFIG_SYSFS_DEPRECATED |
239378f1 KS |
163 | if (dev->class) { |
164 | struct device *parent = dev->parent; | |
165 | ||
166 | /* find first bus device in parent chain */ | |
167 | while (parent && !parent->bus) | |
168 | parent = parent->parent; | |
169 | if (parent && parent->bus) { | |
170 | const char *path; | |
171 | ||
172 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
2c7afd12 | 173 | if (path) { |
7eff2e7a | 174 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
2c7afd12 KS |
175 | kfree(path); |
176 | } | |
239378f1 | 177 | |
7eff2e7a | 178 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
239378f1 KS |
179 | |
180 | if (parent->driver) | |
7eff2e7a KS |
181 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
182 | parent->driver->name); | |
239378f1 KS |
183 | } |
184 | } else if (dev->bus) { | |
7eff2e7a | 185 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
239378f1 KS |
186 | |
187 | if (dev->driver) | |
7eff2e7a | 188 | add_uevent_var(env, "PHYSDEVDRIVER=%s", 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) | |
621a1672 DT |
330 | sysfs_remove_group(&dev->kobj, groups[i]); |
331 | break; | |
de0ff00d GKH |
332 | } |
333 | } | |
334 | } | |
de0ff00d GKH |
335 | return error; |
336 | } | |
337 | ||
621a1672 DT |
338 | static void device_remove_groups(struct device *dev, |
339 | struct attribute_group **groups) | |
de0ff00d GKH |
340 | { |
341 | int i; | |
621a1672 DT |
342 | |
343 | if (groups) | |
344 | for (i = 0; groups[i]; i++) | |
345 | sysfs_remove_group(&dev->kobj, groups[i]); | |
de0ff00d GKH |
346 | } |
347 | ||
2620efef GKH |
348 | static int device_add_attrs(struct device *dev) |
349 | { | |
350 | struct class *class = dev->class; | |
f9f852df | 351 | struct device_type *type = dev->type; |
621a1672 | 352 | int error; |
2620efef | 353 | |
621a1672 DT |
354 | if (class) { |
355 | error = device_add_attributes(dev, class->dev_attrs); | |
f9f852df | 356 | if (error) |
621a1672 | 357 | return error; |
2620efef | 358 | } |
f9f852df | 359 | |
621a1672 DT |
360 | if (type) { |
361 | error = device_add_groups(dev, type->groups); | |
f9f852df | 362 | if (error) |
621a1672 | 363 | goto err_remove_class_attrs; |
f9f852df KS |
364 | } |
365 | ||
621a1672 DT |
366 | error = device_add_groups(dev, dev->groups); |
367 | if (error) | |
368 | goto err_remove_type_groups; | |
369 | ||
370 | return 0; | |
371 | ||
372 | err_remove_type_groups: | |
373 | if (type) | |
374 | device_remove_groups(dev, type->groups); | |
375 | err_remove_class_attrs: | |
376 | if (class) | |
377 | device_remove_attributes(dev, class->dev_attrs); | |
378 | ||
2620efef GKH |
379 | return error; |
380 | } | |
381 | ||
382 | static void device_remove_attrs(struct device *dev) | |
383 | { | |
384 | struct class *class = dev->class; | |
f9f852df | 385 | struct device_type *type = dev->type; |
2620efef | 386 | |
621a1672 | 387 | device_remove_groups(dev, dev->groups); |
f9f852df | 388 | |
621a1672 DT |
389 | if (type) |
390 | device_remove_groups(dev, type->groups); | |
391 | ||
392 | if (class) | |
393 | device_remove_attributes(dev, class->dev_attrs); | |
2620efef GKH |
394 | } |
395 | ||
396 | ||
23681e47 GKH |
397 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
398 | char *buf) | |
399 | { | |
400 | return print_dev_t(buf, dev->devt); | |
401 | } | |
402 | ||
ad6a1e1c TH |
403 | static struct device_attribute devt_attr = |
404 | __ATTR(dev, S_IRUGO, show_dev, NULL); | |
405 | ||
881c6cfd GKH |
406 | /* kset to create /sys/devices/ */ |
407 | struct kset *devices_kset; | |
1da177e4 LT |
408 | |
409 | ||
410 | /** | |
411 | * device_create_file - create sysfs attribute file for device. | |
412 | * @dev: device. | |
413 | * @attr: device attribute descriptor. | |
414 | */ | |
415 | ||
416 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
417 | { | |
418 | int error = 0; | |
419 | if (get_device(dev)) { | |
420 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
421 | put_device(dev); | |
422 | } | |
423 | return error; | |
424 | } | |
425 | ||
426 | /** | |
427 | * device_remove_file - remove sysfs attribute file. | |
428 | * @dev: device. | |
429 | * @attr: device attribute descriptor. | |
430 | */ | |
431 | ||
432 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
433 | { | |
434 | if (get_device(dev)) { | |
435 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
436 | put_device(dev); | |
437 | } | |
438 | } | |
439 | ||
2589f188 GKH |
440 | /** |
441 | * device_create_bin_file - create sysfs binary attribute file for device. | |
442 | * @dev: device. | |
443 | * @attr: device binary attribute descriptor. | |
444 | */ | |
445 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
446 | { | |
447 | int error = -EINVAL; | |
448 | if (dev) | |
449 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
450 | return error; | |
451 | } | |
452 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
453 | ||
454 | /** | |
455 | * device_remove_bin_file - remove sysfs binary attribute file | |
456 | * @dev: device. | |
457 | * @attr: device binary attribute descriptor. | |
458 | */ | |
459 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
460 | { | |
461 | if (dev) | |
462 | sysfs_remove_bin_file(&dev->kobj, attr); | |
463 | } | |
464 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
465 | ||
d9a9cdfb | 466 | /** |
523ded71 | 467 | * device_schedule_callback_owner - helper to schedule a callback for a device |
d9a9cdfb AS |
468 | * @dev: device. |
469 | * @func: callback function to invoke later. | |
523ded71 | 470 | * @owner: module owning the callback routine |
d9a9cdfb AS |
471 | * |
472 | * Attribute methods must not unregister themselves or their parent device | |
473 | * (which would amount to the same thing). Attempts to do so will deadlock, | |
474 | * since unregistration is mutually exclusive with driver callbacks. | |
475 | * | |
476 | * Instead methods can call this routine, which will attempt to allocate | |
477 | * and schedule a workqueue request to call back @func with @dev as its | |
478 | * argument in the workqueue's process context. @dev will be pinned until | |
479 | * @func returns. | |
480 | * | |
523ded71 AS |
481 | * This routine is usually called via the inline device_schedule_callback(), |
482 | * which automatically sets @owner to THIS_MODULE. | |
483 | * | |
d9a9cdfb | 484 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
523ded71 | 485 | * be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb AS |
486 | * |
487 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an | |
488 | * underlying sysfs routine (since it is intended for use by attribute | |
489 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. | |
490 | */ | |
523ded71 AS |
491 | int device_schedule_callback_owner(struct device *dev, |
492 | void (*func)(struct device *), struct module *owner) | |
d9a9cdfb AS |
493 | { |
494 | return sysfs_schedule_callback(&dev->kobj, | |
523ded71 | 495 | (void (*)(void *)) func, dev, owner); |
d9a9cdfb | 496 | } |
523ded71 | 497 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb | 498 | |
34bb61f9 JB |
499 | static void klist_children_get(struct klist_node *n) |
500 | { | |
501 | struct device *dev = container_of(n, struct device, knode_parent); | |
502 | ||
503 | get_device(dev); | |
504 | } | |
505 | ||
506 | static void klist_children_put(struct klist_node *n) | |
507 | { | |
508 | struct device *dev = container_of(n, struct device, knode_parent); | |
509 | ||
510 | put_device(dev); | |
511 | } | |
512 | ||
1da177e4 LT |
513 | |
514 | /** | |
515 | * device_initialize - init device structure. | |
516 | * @dev: device. | |
517 | * | |
518 | * This prepares the device for use by other layers, | |
519 | * including adding it to the device hierarchy. | |
520 | * It is the first half of device_register(), if called by | |
521 | * that, though it can also be called separately, so one | |
522 | * may use @dev's fields (e.g. the refcount). | |
523 | */ | |
524 | ||
525 | void device_initialize(struct device *dev) | |
526 | { | |
881c6cfd | 527 | dev->kobj.kset = devices_kset; |
9990513c | 528 | kobject_init_ng(&dev->kobj, &device_ktype); |
34bb61f9 JB |
529 | klist_init(&dev->klist_children, klist_children_get, |
530 | klist_children_put); | |
1da177e4 | 531 | INIT_LIST_HEAD(&dev->dma_pools); |
23681e47 | 532 | INIT_LIST_HEAD(&dev->node); |
af70316a | 533 | init_MUTEX(&dev->sem); |
9ac7849e TH |
534 | spin_lock_init(&dev->devres_lock); |
535 | INIT_LIST_HEAD(&dev->devres_head); | |
0ac85241 | 536 | device_init_wakeup(dev, 0); |
87348136 | 537 | set_dev_node(dev, -1); |
1da177e4 LT |
538 | } |
539 | ||
40fa5422 | 540 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 KS |
541 | static struct kobject *get_device_parent(struct device *dev, |
542 | struct device *parent) | |
40fa5422 | 543 | { |
da231fd5 | 544 | /* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de | 545 | if (dev->class && (!parent || parent->class != dev->class)) |
823bccfc | 546 | return &dev->class->subsys.kobj; |
da231fd5 | 547 | /* all other devices keep their parent */ |
40fa5422 | 548 | else if (parent) |
c744aeae | 549 | return &parent->kobj; |
40fa5422 | 550 | |
c744aeae | 551 | return NULL; |
40fa5422 | 552 | } |
da231fd5 KS |
553 | |
554 | static inline void cleanup_device_parent(struct device *dev) {} | |
40fa5422 | 555 | #else |
86406245 | 556 | static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6 | 557 | { |
86406245 | 558 | static struct kobject *virtual_dir = NULL; |
f0ee61a6 | 559 | |
86406245 | 560 | if (!virtual_dir) |
4ff6abff | 561 | virtual_dir = kobject_create_and_add("virtual", |
881c6cfd | 562 | &devices_kset->kobj); |
f0ee61a6 | 563 | |
86406245 | 564 | return virtual_dir; |
f0ee61a6 GKH |
565 | } |
566 | ||
da231fd5 KS |
567 | static struct kobject *get_device_parent(struct device *dev, |
568 | struct device *parent) | |
40fa5422 | 569 | { |
43968d2f GKH |
570 | int retval; |
571 | ||
86406245 KS |
572 | if (dev->class) { |
573 | struct kobject *kobj = NULL; | |
574 | struct kobject *parent_kobj; | |
575 | struct kobject *k; | |
576 | ||
577 | /* | |
578 | * If we have no parent, we live in "virtual". | |
579 | * Class-devices with a bus-device as parent, live | |
580 | * in a class-directory to prevent namespace collisions. | |
581 | */ | |
582 | if (parent == NULL) | |
583 | parent_kobj = virtual_device_parent(dev); | |
584 | else if (parent->class) | |
585 | return &parent->kobj; | |
586 | else | |
587 | parent_kobj = &parent->kobj; | |
588 | ||
589 | /* find our class-directory at the parent and reference it */ | |
590 | spin_lock(&dev->class->class_dirs.list_lock); | |
591 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) | |
592 | if (k->parent == parent_kobj) { | |
593 | kobj = kobject_get(k); | |
594 | break; | |
595 | } | |
596 | spin_unlock(&dev->class->class_dirs.list_lock); | |
597 | if (kobj) | |
598 | return kobj; | |
599 | ||
600 | /* or create a new class-directory at the parent device */ | |
43968d2f GKH |
601 | k = kobject_create(); |
602 | if (!k) | |
603 | return NULL; | |
604 | k->kset = &dev->class->class_dirs; | |
605 | retval = kobject_add_ng(k, parent_kobj, "%s", dev->class->name); | |
606 | if (retval < 0) { | |
607 | kobject_put(k); | |
608 | return NULL; | |
609 | } | |
610 | /* Do not emit a uevent, as it's not needed for this | |
611 | * "class glue" directory. */ | |
612 | return k; | |
86406245 KS |
613 | } |
614 | ||
615 | if (parent) | |
c744aeae CH |
616 | return &parent->kobj; |
617 | return NULL; | |
618 | } | |
da231fd5 KS |
619 | |
620 | static void cleanup_device_parent(struct device *dev) | |
621 | { | |
622 | struct device *d; | |
623 | int other = 0; | |
624 | ||
625 | if (!dev->class) | |
626 | return; | |
627 | ||
628 | /* see if we live in a parent class directory */ | |
629 | if (dev->kobj.parent->kset != &dev->class->class_dirs) | |
630 | return; | |
631 | ||
632 | /* if we are the last child of our class, delete the directory */ | |
633 | down(&dev->class->sem); | |
634 | list_for_each_entry(d, &dev->class->devices, node) { | |
635 | if (d == dev) | |
636 | continue; | |
637 | if (d->kobj.parent == dev->kobj.parent) { | |
638 | other = 1; | |
639 | break; | |
640 | } | |
641 | } | |
642 | if (!other) | |
643 | kobject_del(dev->kobj.parent); | |
644 | kobject_put(dev->kobj.parent); | |
645 | up(&dev->class->sem); | |
646 | } | |
c744aeae | 647 | #endif |
86406245 | 648 | |
c744aeae CH |
649 | static int setup_parent(struct device *dev, struct device *parent) |
650 | { | |
651 | struct kobject *kobj; | |
652 | kobj = get_device_parent(dev, parent); | |
653 | if (IS_ERR(kobj)) | |
654 | return PTR_ERR(kobj); | |
655 | if (kobj) | |
656 | dev->kobj.parent = kobj; | |
40fa5422 GKH |
657 | return 0; |
658 | } | |
40fa5422 | 659 | |
2ee97caf CH |
660 | static int device_add_class_symlinks(struct device *dev) |
661 | { | |
662 | int error; | |
663 | ||
664 | if (!dev->class) | |
665 | return 0; | |
da231fd5 | 666 | |
2ee97caf CH |
667 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, |
668 | "subsystem"); | |
669 | if (error) | |
670 | goto out; | |
da231fd5 KS |
671 | |
672 | #ifdef CONFIG_SYSFS_DEPRECATED | |
673 | /* stacked class devices need a symlink in the class directory */ | |
2ee97caf CH |
674 | if (dev->kobj.parent != &dev->class->subsys.kobj) { |
675 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
676 | dev->bus_id); | |
677 | if (error) | |
678 | goto out_subsys; | |
679 | } | |
da231fd5 | 680 | |
27907689 | 681 | if (dev->parent) { |
da231fd5 KS |
682 | struct device *parent = dev->parent; |
683 | char *class_name; | |
4f01a757 | 684 | |
da231fd5 KS |
685 | /* |
686 | * stacked class devices have the 'device' link | |
687 | * pointing to the bus device instead of the parent | |
688 | */ | |
689 | while (parent->class && !parent->bus && parent->parent) | |
690 | parent = parent->parent; | |
691 | ||
692 | error = sysfs_create_link(&dev->kobj, | |
693 | &parent->kobj, | |
4f01a757 DT |
694 | "device"); |
695 | if (error) | |
696 | goto out_busid; | |
da231fd5 KS |
697 | |
698 | class_name = make_class_name(dev->class->name, | |
699 | &dev->kobj); | |
700 | if (class_name) | |
701 | error = sysfs_create_link(&dev->parent->kobj, | |
702 | &dev->kobj, class_name); | |
703 | kfree(class_name); | |
704 | if (error) | |
705 | goto out_device; | |
2ee97caf CH |
706 | } |
707 | return 0; | |
708 | ||
2ee97caf CH |
709 | out_device: |
710 | if (dev->parent) | |
711 | sysfs_remove_link(&dev->kobj, "device"); | |
2ee97caf CH |
712 | out_busid: |
713 | if (dev->kobj.parent != &dev->class->subsys.kobj) | |
714 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
da231fd5 KS |
715 | #else |
716 | /* link in the class directory pointing to the device */ | |
717 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
718 | dev->bus_id); | |
719 | if (error) | |
720 | goto out_subsys; | |
721 | ||
722 | if (dev->parent) { | |
723 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, | |
724 | "device"); | |
725 | if (error) | |
726 | goto out_busid; | |
727 | } | |
728 | return 0; | |
729 | ||
730 | out_busid: | |
731 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
732 | #endif | |
733 | ||
2ee97caf CH |
734 | out_subsys: |
735 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
736 | out: | |
737 | return error; | |
738 | } | |
739 | ||
740 | static void device_remove_class_symlinks(struct device *dev) | |
741 | { | |
742 | if (!dev->class) | |
743 | return; | |
da231fd5 | 744 | |
2ee97caf | 745 | #ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5 | 746 | if (dev->parent) { |
2ee97caf CH |
747 | char *class_name; |
748 | ||
749 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
750 | if (class_name) { | |
751 | sysfs_remove_link(&dev->parent->kobj, class_name); | |
752 | kfree(class_name); | |
753 | } | |
2ee97caf CH |
754 | sysfs_remove_link(&dev->kobj, "device"); |
755 | } | |
da231fd5 | 756 | |
2ee97caf CH |
757 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
758 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
da231fd5 KS |
759 | #else |
760 | if (dev->parent) | |
761 | sysfs_remove_link(&dev->kobj, "device"); | |
762 | ||
763 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); | |
764 | #endif | |
765 | ||
2ee97caf CH |
766 | sysfs_remove_link(&dev->kobj, "subsystem"); |
767 | } | |
768 | ||
1da177e4 LT |
769 | /** |
770 | * device_add - add device to device hierarchy. | |
771 | * @dev: device. | |
772 | * | |
773 | * This is part 2 of device_register(), though may be called | |
774 | * separately _iff_ device_initialize() has been called separately. | |
775 | * | |
9990513c | 776 | * This adds it to the kobject hierarchy via kobject_add_ng(), adds it |
1da177e4 LT |
777 | * to the global and sibling lists for the device, then |
778 | * adds it to the other relevant subsystems of the driver model. | |
779 | */ | |
780 | int device_add(struct device *dev) | |
781 | { | |
782 | struct device *parent = NULL; | |
c47ed219 | 783 | struct class_interface *class_intf; |
775b64d2 RW |
784 | int error; |
785 | ||
786 | error = pm_sleep_lock(); | |
787 | if (error) { | |
788 | dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__); | |
789 | dump_stack(); | |
790 | return error; | |
791 | } | |
1da177e4 LT |
792 | |
793 | dev = get_device(dev); | |
775b64d2 RW |
794 | if (!dev || !strlen(dev->bus_id)) { |
795 | error = -EINVAL; | |
1da177e4 | 796 | goto Error; |
775b64d2 | 797 | } |
1da177e4 | 798 | |
7dc72b28 | 799 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
c205ef48 | 800 | |
1da177e4 | 801 | parent = get_device(dev->parent); |
40fa5422 GKH |
802 | error = setup_parent(dev, parent); |
803 | if (error) | |
804 | goto Error; | |
1da177e4 LT |
805 | |
806 | /* first, register with generic layer. */ | |
9990513c | 807 | error = kobject_add_ng(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
40fa5422 | 808 | if (error) |
1da177e4 | 809 | goto Error; |
a7fd6706 | 810 | |
37022644 BW |
811 | /* notify platform of device entry */ |
812 | if (platform_notify) | |
813 | platform_notify(dev); | |
814 | ||
116af378 BH |
815 | /* notify clients of device entry (new way) */ |
816 | if (dev->bus) | |
c6f7e72a | 817 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 BH |
818 | BUS_NOTIFY_ADD_DEVICE, dev); |
819 | ||
ad6a1e1c | 820 | error = device_create_file(dev, &uevent_attr); |
a306eea4 CH |
821 | if (error) |
822 | goto attrError; | |
a7fd6706 | 823 | |
23681e47 | 824 | if (MAJOR(dev->devt)) { |
ad6a1e1c TH |
825 | error = device_create_file(dev, &devt_attr); |
826 | if (error) | |
a306eea4 | 827 | goto ueventattrError; |
23681e47 GKH |
828 | } |
829 | ||
2ee97caf CH |
830 | error = device_add_class_symlinks(dev); |
831 | if (error) | |
832 | goto SymlinkError; | |
dc0afa83 CH |
833 | error = device_add_attrs(dev); |
834 | if (error) | |
2620efef | 835 | goto AttrsError; |
dec13c15 | 836 | error = dpm_sysfs_add(dev); |
dc0afa83 | 837 | if (error) |
1da177e4 | 838 | goto PMError; |
dec13c15 | 839 | device_pm_add(dev); |
dc0afa83 CH |
840 | error = bus_add_device(dev); |
841 | if (error) | |
1da177e4 | 842 | goto BusError; |
83b5fb4c | 843 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
c6a46696 | 844 | bus_attach_device(dev); |
1da177e4 | 845 | if (parent) |
d856f1e3 | 846 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
1da177e4 | 847 | |
5d9fd169 | 848 | if (dev->class) { |
5d9fd169 | 849 | down(&dev->class->sem); |
c47ed219 | 850 | /* tie the class to the device */ |
5d9fd169 | 851 | list_add_tail(&dev->node, &dev->class->devices); |
c47ed219 GKH |
852 | |
853 | /* notify any interfaces that the device is here */ | |
854 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
855 | if (class_intf->add_dev) | |
856 | class_intf->add_dev(dev, class_intf); | |
5d9fd169 GKH |
857 | up(&dev->class->sem); |
858 | } | |
1da177e4 LT |
859 | Done: |
860 | put_device(dev); | |
775b64d2 | 861 | pm_sleep_unlock(); |
1da177e4 LT |
862 | return error; |
863 | BusError: | |
864 | device_pm_remove(dev); | |
dec13c15 | 865 | dpm_sysfs_remove(dev); |
1da177e4 | 866 | PMError: |
116af378 | 867 | if (dev->bus) |
c6f7e72a | 868 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 869 | BUS_NOTIFY_DEL_DEVICE, dev); |
82f0cf9b | 870 | device_remove_attrs(dev); |
2620efef | 871 | AttrsError: |
2ee97caf CH |
872 | device_remove_class_symlinks(dev); |
873 | SymlinkError: | |
ad6a1e1c TH |
874 | if (MAJOR(dev->devt)) |
875 | device_remove_file(dev, &devt_attr); | |
a306eea4 | 876 | ueventattrError: |
ad6a1e1c | 877 | device_remove_file(dev, &uevent_attr); |
23681e47 | 878 | attrError: |
312c004d | 879 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4 LT |
880 | kobject_del(&dev->kobj); |
881 | Error: | |
882 | if (parent) | |
883 | put_device(parent); | |
884 | goto Done; | |
885 | } | |
886 | ||
887 | ||
888 | /** | |
889 | * device_register - register a device with the system. | |
890 | * @dev: pointer to the device structure | |
891 | * | |
892 | * This happens in two clean steps - initialize the device | |
893 | * and add it to the system. The two steps can be called | |
894 | * separately, but this is the easiest and most common. | |
895 | * I.e. you should only call the two helpers separately if | |
896 | * have a clearly defined need to use and refcount the device | |
897 | * before it is added to the hierarchy. | |
898 | */ | |
899 | ||
900 | int device_register(struct device *dev) | |
901 | { | |
902 | device_initialize(dev); | |
903 | return device_add(dev); | |
904 | } | |
905 | ||
906 | ||
907 | /** | |
908 | * get_device - increment reference count for device. | |
909 | * @dev: device. | |
910 | * | |
911 | * This simply forwards the call to kobject_get(), though | |
912 | * we do take care to provide for the case that we get a NULL | |
913 | * pointer passed in. | |
914 | */ | |
915 | ||
916 | struct device * get_device(struct device * dev) | |
917 | { | |
918 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
919 | } | |
920 | ||
921 | ||
922 | /** | |
923 | * put_device - decrement reference count. | |
924 | * @dev: device in question. | |
925 | */ | |
926 | void put_device(struct device * dev) | |
927 | { | |
928 | if (dev) | |
929 | kobject_put(&dev->kobj); | |
930 | } | |
931 | ||
932 | ||
933 | /** | |
934 | * device_del - delete device from system. | |
935 | * @dev: device. | |
936 | * | |
937 | * This is the first part of the device unregistration | |
938 | * sequence. This removes the device from the lists we control | |
939 | * from here, has it removed from the other driver model | |
940 | * subsystems it was added to in device_add(), and removes it | |
941 | * from the kobject hierarchy. | |
942 | * | |
943 | * NOTE: this should be called manually _iff_ device_add() was | |
944 | * also called manually. | |
945 | */ | |
946 | ||
947 | void device_del(struct device * dev) | |
948 | { | |
949 | struct device * parent = dev->parent; | |
c47ed219 | 950 | struct class_interface *class_intf; |
1da177e4 | 951 | |
775b64d2 | 952 | device_pm_remove(dev); |
1da177e4 | 953 | if (parent) |
d62c0f9f | 954 | klist_del(&dev->knode_parent); |
ad6a1e1c TH |
955 | if (MAJOR(dev->devt)) |
956 | device_remove_file(dev, &devt_attr); | |
b9d9c82b | 957 | if (dev->class) { |
da231fd5 | 958 | device_remove_class_symlinks(dev); |
99ef3ef8 | 959 | |
5d9fd169 | 960 | down(&dev->class->sem); |
c47ed219 GKH |
961 | /* notify any interfaces that the device is now gone */ |
962 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
963 | if (class_intf->remove_dev) | |
964 | class_intf->remove_dev(dev, class_intf); | |
965 | /* remove the device from the class list */ | |
5d9fd169 GKH |
966 | list_del_init(&dev->node); |
967 | up(&dev->class->sem); | |
b9d9c82b | 968 | } |
ad6a1e1c | 969 | device_remove_file(dev, &uevent_attr); |
2620efef | 970 | device_remove_attrs(dev); |
28953533 | 971 | bus_remove_device(dev); |
1da177e4 | 972 | |
2f8d16a9 TH |
973 | /* |
974 | * Some platform devices are driven without driver attached | |
975 | * and managed resources may have been acquired. Make sure | |
976 | * all resources are released. | |
977 | */ | |
978 | devres_release_all(dev); | |
979 | ||
1da177e4 LT |
980 | /* Notify the platform of the removal, in case they |
981 | * need to do anything... | |
982 | */ | |
983 | if (platform_notify_remove) | |
984 | platform_notify_remove(dev); | |
116af378 | 985 | if (dev->bus) |
c6f7e72a | 986 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
116af378 | 987 | BUS_NOTIFY_DEL_DEVICE, dev); |
312c004d | 988 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5 | 989 | cleanup_device_parent(dev); |
1da177e4 | 990 | kobject_del(&dev->kobj); |
da231fd5 | 991 | put_device(parent); |
1da177e4 LT |
992 | } |
993 | ||
994 | /** | |
995 | * device_unregister - unregister device from system. | |
996 | * @dev: device going away. | |
997 | * | |
998 | * We do this in two parts, like we do device_register(). First, | |
999 | * we remove it from all the subsystems with device_del(), then | |
1000 | * we decrement the reference count via put_device(). If that | |
1001 | * is the final reference count, the device will be cleaned up | |
1002 | * via device_release() above. Otherwise, the structure will | |
1003 | * stick around until the final reference to the device is dropped. | |
1004 | */ | |
1005 | void device_unregister(struct device * dev) | |
1006 | { | |
7dc72b28 | 1007 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
1da177e4 LT |
1008 | device_del(dev); |
1009 | put_device(dev); | |
1010 | } | |
1011 | ||
1012 | ||
36239577 PM |
1013 | static struct device * next_device(struct klist_iter * i) |
1014 | { | |
1015 | struct klist_node * n = klist_next(i); | |
1016 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
1017 | } | |
1018 | ||
1da177e4 LT |
1019 | /** |
1020 | * device_for_each_child - device child iterator. | |
c41455fb | 1021 | * @parent: parent struct device. |
1da177e4 LT |
1022 | * @data: data for the callback. |
1023 | * @fn: function to be called for each device. | |
1024 | * | |
c41455fb | 1025 | * Iterate over @parent's child devices, and call @fn for each, |
1da177e4 LT |
1026 | * passing it @data. |
1027 | * | |
1028 | * We check the return of @fn each time. If it returns anything | |
1029 | * other than 0, we break out and return that value. | |
1030 | */ | |
36239577 | 1031 | int device_for_each_child(struct device * parent, void * data, |
1da177e4 LT |
1032 | int (*fn)(struct device *, void *)) |
1033 | { | |
36239577 | 1034 | struct klist_iter i; |
1da177e4 LT |
1035 | struct device * child; |
1036 | int error = 0; | |
1037 | ||
36239577 PM |
1038 | klist_iter_init(&parent->klist_children, &i); |
1039 | while ((child = next_device(&i)) && !error) | |
1040 | error = fn(child, data); | |
1041 | klist_iter_exit(&i); | |
1da177e4 LT |
1042 | return error; |
1043 | } | |
1044 | ||
5ab69981 CH |
1045 | /** |
1046 | * device_find_child - device iterator for locating a particular device. | |
1047 | * @parent: parent struct device | |
1048 | * @data: Data to pass to match function | |
1049 | * @match: Callback function to check device | |
1050 | * | |
1051 | * This is similar to the device_for_each_child() function above, but it | |
1052 | * returns a reference to a device that is 'found' for later use, as | |
1053 | * determined by the @match callback. | |
1054 | * | |
1055 | * The callback should return 0 if the device doesn't match and non-zero | |
1056 | * if it does. If the callback returns non-zero and a reference to the | |
1057 | * current device can be obtained, this function will return to the caller | |
1058 | * and not iterate over any more devices. | |
1059 | */ | |
1060 | struct device * device_find_child(struct device *parent, void *data, | |
1061 | int (*match)(struct device *, void *)) | |
1062 | { | |
1063 | struct klist_iter i; | |
1064 | struct device *child; | |
1065 | ||
1066 | if (!parent) | |
1067 | return NULL; | |
1068 | ||
1069 | klist_iter_init(&parent->klist_children, &i); | |
1070 | while ((child = next_device(&i))) | |
1071 | if (match(child, data) && get_device(child)) | |
1072 | break; | |
1073 | klist_iter_exit(&i); | |
1074 | return child; | |
1075 | } | |
1076 | ||
1da177e4 LT |
1077 | int __init devices_init(void) |
1078 | { | |
881c6cfd GKH |
1079 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
1080 | if (!devices_kset) | |
1081 | return -ENOMEM; | |
1082 | return 0; | |
1da177e4 LT |
1083 | } |
1084 | ||
1085 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
5ab69981 | 1086 | EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4 LT |
1087 | |
1088 | EXPORT_SYMBOL_GPL(device_initialize); | |
1089 | EXPORT_SYMBOL_GPL(device_add); | |
1090 | EXPORT_SYMBOL_GPL(device_register); | |
1091 | ||
1092 | EXPORT_SYMBOL_GPL(device_del); | |
1093 | EXPORT_SYMBOL_GPL(device_unregister); | |
1094 | EXPORT_SYMBOL_GPL(get_device); | |
1095 | EXPORT_SYMBOL_GPL(put_device); | |
1da177e4 LT |
1096 | |
1097 | EXPORT_SYMBOL_GPL(device_create_file); | |
1098 | EXPORT_SYMBOL_GPL(device_remove_file); | |
23681e47 GKH |
1099 | |
1100 | ||
1101 | static void device_create_release(struct device *dev) | |
1102 | { | |
7dc72b28 | 1103 | pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); |
23681e47 GKH |
1104 | kfree(dev); |
1105 | } | |
1106 | ||
1107 | /** | |
1108 | * device_create - creates a device and registers it with sysfs | |
42734daf HK |
1109 | * @class: pointer to the struct class that this device should be registered to |
1110 | * @parent: pointer to the parent struct device of this new device, if any | |
1111 | * @devt: the dev_t for the char device to be added | |
1112 | * @fmt: string for the device's name | |
1113 | * | |
1114 | * This function can be used by char device classes. A struct device | |
1115 | * will be created in sysfs, registered to the specified class. | |
23681e47 | 1116 | * |
23681e47 GKH |
1117 | * A "dev" file will be created, showing the dev_t for the device, if |
1118 | * the dev_t is not 0,0. | |
42734daf HK |
1119 | * If a pointer to a parent struct device is passed in, the newly created |
1120 | * struct device will be a child of that device in sysfs. | |
1121 | * The pointer to the struct device will be returned from the call. | |
1122 | * Any further sysfs files that might be required can be created using this | |
23681e47 GKH |
1123 | * pointer. |
1124 | * | |
1125 | * Note: the struct class passed to this function must have previously | |
1126 | * been created with a call to class_create(). | |
1127 | */ | |
1128 | struct device *device_create(struct class *class, struct device *parent, | |
5cbe5f8a | 1129 | dev_t devt, const char *fmt, ...) |
23681e47 GKH |
1130 | { |
1131 | va_list args; | |
1132 | struct device *dev = NULL; | |
1133 | int retval = -ENODEV; | |
1134 | ||
1135 | if (class == NULL || IS_ERR(class)) | |
1136 | goto error; | |
23681e47 GKH |
1137 | |
1138 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
1139 | if (!dev) { | |
1140 | retval = -ENOMEM; | |
1141 | goto error; | |
1142 | } | |
1143 | ||
1144 | dev->devt = devt; | |
1145 | dev->class = class; | |
1146 | dev->parent = parent; | |
1147 | dev->release = device_create_release; | |
1148 | ||
1149 | va_start(args, fmt); | |
1150 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
1151 | va_end(args); | |
1152 | retval = device_register(dev); | |
1153 | if (retval) | |
1154 | goto error; | |
1155 | ||
23681e47 GKH |
1156 | return dev; |
1157 | ||
1158 | error: | |
1159 | kfree(dev); | |
1160 | return ERR_PTR(retval); | |
1161 | } | |
1162 | EXPORT_SYMBOL_GPL(device_create); | |
1163 | ||
1164 | /** | |
775b64d2 | 1165 | * find_device - finds a device that was created with device_create() |
42734daf HK |
1166 | * @class: pointer to the struct class that this device was registered with |
1167 | * @devt: the dev_t of the device that was previously registered | |
23681e47 | 1168 | */ |
775b64d2 | 1169 | static struct device *find_device(struct class *class, dev_t devt) |
23681e47 GKH |
1170 | { |
1171 | struct device *dev = NULL; | |
1172 | struct device *dev_tmp; | |
1173 | ||
1174 | down(&class->sem); | |
1175 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
1176 | if (dev_tmp->devt == devt) { | |
1177 | dev = dev_tmp; | |
1178 | break; | |
1179 | } | |
1180 | } | |
1181 | up(&class->sem); | |
775b64d2 RW |
1182 | return dev; |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * device_destroy - removes a device that was created with device_create() | |
1187 | * @class: pointer to the struct class that this device was registered with | |
1188 | * @devt: the dev_t of the device that was previously registered | |
1189 | * | |
1190 | * This call unregisters and cleans up a device that was created with a | |
1191 | * call to device_create(). | |
1192 | */ | |
1193 | void device_destroy(struct class *class, dev_t devt) | |
1194 | { | |
1195 | struct device *dev; | |
23681e47 | 1196 | |
775b64d2 | 1197 | dev = find_device(class, devt); |
5d9fd169 | 1198 | if (dev) |
23681e47 | 1199 | device_unregister(dev); |
23681e47 GKH |
1200 | } |
1201 | EXPORT_SYMBOL_GPL(device_destroy); | |
a2de48ca | 1202 | |
775b64d2 RW |
1203 | #ifdef CONFIG_PM_SLEEP |
1204 | /** | |
1205 | * destroy_suspended_device - asks the PM core to remove a suspended device | |
1206 | * @class: pointer to the struct class that this device was registered with | |
1207 | * @devt: the dev_t of the device that was previously registered | |
1208 | * | |
1209 | * This call notifies the PM core of the necessity to unregister a suspended | |
1210 | * device created with a call to device_create() (devices cannot be | |
1211 | * unregistered directly while suspended, since the PM core holds their | |
1212 | * semaphores at that time). | |
1213 | * | |
1214 | * It can only be called within the scope of a system sleep transition. In | |
1215 | * practice this means it has to be directly or indirectly invoked either by | |
1216 | * a suspend or resume method, or by the PM core (e.g. via | |
1217 | * disable_nonboot_cpus() or enable_nonboot_cpus()). | |
1218 | */ | |
1219 | void destroy_suspended_device(struct class *class, dev_t devt) | |
1220 | { | |
1221 | struct device *dev; | |
1222 | ||
1223 | dev = find_device(class, devt); | |
1224 | if (dev) | |
1225 | device_pm_schedule_removal(dev); | |
1226 | } | |
1227 | EXPORT_SYMBOL_GPL(destroy_suspended_device); | |
1228 | #endif /* CONFIG_PM_SLEEP */ | |
1229 | ||
a2de48ca GKH |
1230 | /** |
1231 | * device_rename - renames a device | |
1232 | * @dev: the pointer to the struct device to be renamed | |
1233 | * @new_name: the new name of the device | |
1234 | */ | |
1235 | int device_rename(struct device *dev, char *new_name) | |
1236 | { | |
1237 | char *old_class_name = NULL; | |
1238 | char *new_class_name = NULL; | |
2ee97caf | 1239 | char *old_device_name = NULL; |
a2de48ca GKH |
1240 | int error; |
1241 | ||
1242 | dev = get_device(dev); | |
1243 | if (!dev) | |
1244 | return -EINVAL; | |
1245 | ||
7dc72b28 GKH |
1246 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
1247 | __FUNCTION__, new_name); | |
a2de48ca | 1248 | |
99ef3ef8 | 1249 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1250 | if ((dev->class) && (dev->parent)) |
1251 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
99ef3ef8 | 1252 | #endif |
a2de48ca | 1253 | |
2ee97caf CH |
1254 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
1255 | if (!old_device_name) { | |
1256 | error = -ENOMEM; | |
1257 | goto out; | |
a2de48ca | 1258 | } |
2ee97caf | 1259 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
a2de48ca GKH |
1260 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
1261 | ||
1262 | error = kobject_rename(&dev->kobj, new_name); | |
2ee97caf CH |
1263 | if (error) { |
1264 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); | |
1265 | goto out; | |
1266 | } | |
a2de48ca | 1267 | |
99ef3ef8 | 1268 | #ifdef CONFIG_SYSFS_DEPRECATED |
a2de48ca GKH |
1269 | if (old_class_name) { |
1270 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1271 | if (new_class_name) { | |
2ee97caf CH |
1272 | error = sysfs_create_link(&dev->parent->kobj, |
1273 | &dev->kobj, new_class_name); | |
1274 | if (error) | |
1275 | goto out; | |
a2de48ca GKH |
1276 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
1277 | } | |
1278 | } | |
60b8cabd | 1279 | #else |
a2de48ca | 1280 | if (dev->class) { |
2ee97caf CH |
1281 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
1282 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, | |
1283 | dev->bus_id); | |
1284 | if (error) { | |
2ee97caf CH |
1285 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", |
1286 | __FUNCTION__, error); | |
1287 | } | |
a2de48ca | 1288 | } |
60b8cabd KS |
1289 | #endif |
1290 | ||
2ee97caf | 1291 | out: |
a2de48ca GKH |
1292 | put_device(dev); |
1293 | ||
a2de48ca | 1294 | kfree(new_class_name); |
952ab431 | 1295 | kfree(old_class_name); |
2ee97caf | 1296 | kfree(old_device_name); |
a2de48ca GKH |
1297 | |
1298 | return error; | |
1299 | } | |
a2807dbc | 1300 | EXPORT_SYMBOL_GPL(device_rename); |
8a82472f CH |
1301 | |
1302 | static int device_move_class_links(struct device *dev, | |
1303 | struct device *old_parent, | |
1304 | struct device *new_parent) | |
1305 | { | |
f7f3461d | 1306 | int error = 0; |
8a82472f | 1307 | #ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f CH |
1308 | char *class_name; |
1309 | ||
1310 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1311 | if (!class_name) { | |
cb360bbf | 1312 | error = -ENOMEM; |
8a82472f CH |
1313 | goto out; |
1314 | } | |
1315 | if (old_parent) { | |
1316 | sysfs_remove_link(&dev->kobj, "device"); | |
1317 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1318 | } | |
c744aeae CH |
1319 | if (new_parent) { |
1320 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1321 | "device"); | |
1322 | if (error) | |
1323 | goto out; | |
1324 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1325 | class_name); | |
1326 | if (error) | |
1327 | sysfs_remove_link(&dev->kobj, "device"); | |
1328 | } | |
1329 | else | |
1330 | error = 0; | |
8a82472f CH |
1331 | out: |
1332 | kfree(class_name); | |
1333 | return error; | |
1334 | #else | |
f7f3461d GKH |
1335 | if (old_parent) |
1336 | sysfs_remove_link(&dev->kobj, "device"); | |
1337 | if (new_parent) | |
1338 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1339 | "device"); | |
1340 | return error; | |
8a82472f CH |
1341 | #endif |
1342 | } | |
1343 | ||
1344 | /** | |
1345 | * device_move - moves a device to a new parent | |
1346 | * @dev: the pointer to the struct device to be moved | |
c744aeae | 1347 | * @new_parent: the new parent of the device (can by NULL) |
8a82472f CH |
1348 | */ |
1349 | int device_move(struct device *dev, struct device *new_parent) | |
1350 | { | |
1351 | int error; | |
1352 | struct device *old_parent; | |
c744aeae | 1353 | struct kobject *new_parent_kobj; |
8a82472f CH |
1354 | |
1355 | dev = get_device(dev); | |
1356 | if (!dev) | |
1357 | return -EINVAL; | |
1358 | ||
8a82472f | 1359 | new_parent = get_device(new_parent); |
c744aeae CH |
1360 | new_parent_kobj = get_device_parent (dev, new_parent); |
1361 | if (IS_ERR(new_parent_kobj)) { | |
1362 | error = PTR_ERR(new_parent_kobj); | |
1363 | put_device(new_parent); | |
8a82472f CH |
1364 | goto out; |
1365 | } | |
7dc72b28 GKH |
1366 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
1367 | __FUNCTION__, new_parent ? new_parent->bus_id : "<NULL>"); | |
c744aeae | 1368 | error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f CH |
1369 | if (error) { |
1370 | put_device(new_parent); | |
1371 | goto out; | |
1372 | } | |
1373 | old_parent = dev->parent; | |
1374 | dev->parent = new_parent; | |
1375 | if (old_parent) | |
acf02d23 | 1376 | klist_remove(&dev->knode_parent); |
c744aeae CH |
1377 | if (new_parent) |
1378 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
8a82472f CH |
1379 | if (!dev->class) |
1380 | goto out_put; | |
1381 | error = device_move_class_links(dev, old_parent, new_parent); | |
1382 | if (error) { | |
1383 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1384 | device_move_class_links(dev, new_parent, old_parent); | |
1385 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
c744aeae CH |
1386 | if (new_parent) |
1387 | klist_remove(&dev->knode_parent); | |
8a82472f CH |
1388 | if (old_parent) |
1389 | klist_add_tail(&dev->knode_parent, | |
1390 | &old_parent->klist_children); | |
1391 | } | |
1392 | put_device(new_parent); | |
1393 | goto out; | |
1394 | } | |
1395 | out_put: | |
1396 | put_device(old_parent); | |
1397 | out: | |
1398 | put_device(dev); | |
1399 | return error; | |
1400 | } | |
8a82472f | 1401 | EXPORT_SYMBOL_GPL(device_move); |
37b0c020 GKH |
1402 | |
1403 | /** | |
1404 | * device_shutdown - call ->shutdown() on each device to shutdown. | |
1405 | */ | |
1406 | void device_shutdown(void) | |
1407 | { | |
1408 | struct device * dev, *devn; | |
1409 | ||
1410 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, | |
1411 | kobj.entry) { | |
1412 | if (dev->bus && dev->bus->shutdown) { | |
1413 | dev_dbg(dev, "shutdown\n"); | |
1414 | dev->bus->shutdown(dev); | |
1415 | } else if (dev->driver && dev->driver->shutdown) { | |
1416 | dev_dbg(dev, "shutdown\n"); | |
1417 | dev->driver->shutdown(dev); | |
1418 | } | |
1419 | } | |
1420 | } |