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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 | |
6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> | |
7 | * Copyright (c) 2006 Novell, Inc. | |
8 | * | |
9 | * This file is released under the GPLv2 | |
10 | * | |
11 | */ | |
12 | ||
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> | |
19 | #include <linux/kdev_t.h> | |
20 | #include <linux/notifier.h> | |
21 | ||
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 | * Detect the LANANA-assigned LOCAL/EXPERIMENTAL majors | |
32 | */ | |
33 | bool is_lanana_major(unsigned int major) | |
34 | { | |
35 | if (major >= 60 && major <= 63) | |
36 | return 1; | |
37 | if (major >= 120 && major <= 127) | |
38 | return 1; | |
39 | if (major >= 240 && major <= 254) | |
40 | return 1; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | /* | |
45 | * sysfs bindings for devices. | |
46 | */ | |
47 | ||
48 | /** | |
49 | * dev_driver_string - Return a device's driver name, if at all possible | |
50 | * @dev: struct device to get the name of | |
51 | * | |
52 | * Will return the device's driver's name if it is bound to a device. If | |
53 | * the device is not bound to a device, it will return the name of the bus | |
54 | * it is attached to. If it is not attached to a bus either, an empty | |
55 | * string will be returned. | |
56 | */ | |
57 | const char *dev_driver_string(struct device *dev) | |
58 | { | |
59 | return dev->driver ? dev->driver->name : | |
60 | (dev->bus ? dev->bus->name : ""); | |
61 | } | |
62 | EXPORT_SYMBOL(dev_driver_string); | |
63 | ||
64 | #define to_dev(obj) container_of(obj, struct device, kobj) | |
65 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) | |
66 | ||
67 | static ssize_t | |
68 | dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
69 | { | |
70 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
71 | struct device * dev = to_dev(kobj); | |
72 | ssize_t ret = -EIO; | |
73 | ||
74 | if (dev_attr->show) | |
75 | ret = dev_attr->show(dev, dev_attr, buf); | |
76 | return ret; | |
77 | } | |
78 | ||
79 | static ssize_t | |
80 | dev_attr_store(struct kobject * kobj, struct attribute * attr, | |
81 | const char * buf, size_t count) | |
82 | { | |
83 | struct device_attribute * dev_attr = to_dev_attr(attr); | |
84 | struct device * dev = to_dev(kobj); | |
85 | ssize_t ret = -EIO; | |
86 | ||
87 | if (dev_attr->store) | |
88 | ret = dev_attr->store(dev, dev_attr, buf, count); | |
89 | return ret; | |
90 | } | |
91 | ||
92 | static struct sysfs_ops dev_sysfs_ops = { | |
93 | .show = dev_attr_show, | |
94 | .store = dev_attr_store, | |
95 | }; | |
96 | ||
97 | ||
98 | /** | |
99 | * device_release - free device structure. | |
100 | * @kobj: device's kobject. | |
101 | * | |
102 | * This is called once the reference count for the object | |
103 | * reaches 0. We forward the call to the device's release | |
104 | * method, which should handle actually freeing the structure. | |
105 | */ | |
106 | static void device_release(struct kobject * kobj) | |
107 | { | |
108 | struct device * dev = to_dev(kobj); | |
109 | ||
110 | if (dev->release) | |
111 | dev->release(dev); | |
112 | else if (dev->type && dev->type->release) | |
113 | dev->type->release(dev); | |
114 | else if (dev->class && dev->class->dev_release) | |
115 | dev->class->dev_release(dev); | |
116 | else { | |
117 | printk(KERN_ERR "Device '%s' does not have a release() function, " | |
118 | "it is broken and must be fixed.\n", | |
119 | dev->bus_id); | |
120 | WARN_ON(1); | |
121 | } | |
122 | } | |
123 | ||
124 | static struct kobj_type ktype_device = { | |
125 | .release = device_release, | |
126 | .sysfs_ops = &dev_sysfs_ops, | |
127 | }; | |
128 | ||
129 | ||
130 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) | |
131 | { | |
132 | struct kobj_type *ktype = get_ktype(kobj); | |
133 | ||
134 | if (ktype == &ktype_device) { | |
135 | struct device *dev = to_dev(kobj); | |
136 | if (dev->bus) | |
137 | return 1; | |
138 | if (dev->class) | |
139 | return 1; | |
140 | } | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) | |
145 | { | |
146 | struct device *dev = to_dev(kobj); | |
147 | ||
148 | if (dev->bus) | |
149 | return dev->bus->name; | |
150 | if (dev->class) | |
151 | return dev->class->name; | |
152 | return NULL; | |
153 | } | |
154 | ||
155 | static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp, | |
156 | int num_envp, char *buffer, int buffer_size) | |
157 | { | |
158 | struct device *dev = to_dev(kobj); | |
159 | int i = 0; | |
160 | int length = 0; | |
161 | int retval = 0; | |
162 | ||
163 | /* add the major/minor if present */ | |
164 | if (MAJOR(dev->devt)) { | |
165 | add_uevent_var(envp, num_envp, &i, | |
166 | buffer, buffer_size, &length, | |
167 | "MAJOR=%u", MAJOR(dev->devt)); | |
168 | add_uevent_var(envp, num_envp, &i, | |
169 | buffer, buffer_size, &length, | |
170 | "MINOR=%u", MINOR(dev->devt)); | |
171 | } | |
172 | ||
173 | if (dev->driver) | |
174 | add_uevent_var(envp, num_envp, &i, | |
175 | buffer, buffer_size, &length, | |
176 | "DRIVER=%s", dev->driver->name); | |
177 | ||
178 | #ifdef CONFIG_SYSFS_DEPRECATED | |
179 | if (dev->class) { | |
180 | struct device *parent = dev->parent; | |
181 | ||
182 | /* find first bus device in parent chain */ | |
183 | while (parent && !parent->bus) | |
184 | parent = parent->parent; | |
185 | if (parent && parent->bus) { | |
186 | const char *path; | |
187 | ||
188 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); | |
189 | add_uevent_var(envp, num_envp, &i, | |
190 | buffer, buffer_size, &length, | |
191 | "PHYSDEVPATH=%s", path); | |
192 | kfree(path); | |
193 | ||
194 | add_uevent_var(envp, num_envp, &i, | |
195 | buffer, buffer_size, &length, | |
196 | "PHYSDEVBUS=%s", parent->bus->name); | |
197 | ||
198 | if (parent->driver) | |
199 | add_uevent_var(envp, num_envp, &i, | |
200 | buffer, buffer_size, &length, | |
201 | "PHYSDEVDRIVER=%s", parent->driver->name); | |
202 | } | |
203 | } else if (dev->bus) { | |
204 | add_uevent_var(envp, num_envp, &i, | |
205 | buffer, buffer_size, &length, | |
206 | "PHYSDEVBUS=%s", dev->bus->name); | |
207 | ||
208 | if (dev->driver) | |
209 | add_uevent_var(envp, num_envp, &i, | |
210 | buffer, buffer_size, &length, | |
211 | "PHYSDEVDRIVER=%s", dev->driver->name); | |
212 | } | |
213 | #endif | |
214 | ||
215 | /* terminate, set to next free slot, shrink available space */ | |
216 | envp[i] = NULL; | |
217 | envp = &envp[i]; | |
218 | num_envp -= i; | |
219 | buffer = &buffer[length]; | |
220 | buffer_size -= length; | |
221 | ||
222 | if (dev->bus && dev->bus->uevent) { | |
223 | /* have the bus specific function add its stuff */ | |
224 | retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size); | |
225 | if (retval) | |
226 | pr_debug ("%s: bus uevent() returned %d\n", | |
227 | __FUNCTION__, retval); | |
228 | } | |
229 | ||
230 | if (dev->class && dev->class->dev_uevent) { | |
231 | /* have the class specific function add its stuff */ | |
232 | retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size); | |
233 | if (retval) | |
234 | pr_debug("%s: class uevent() returned %d\n", | |
235 | __FUNCTION__, retval); | |
236 | } | |
237 | ||
238 | if (dev->type && dev->type->uevent) { | |
239 | /* have the device type specific fuction add its stuff */ | |
240 | retval = dev->type->uevent(dev, envp, num_envp, buffer, buffer_size); | |
241 | if (retval) | |
242 | pr_debug("%s: dev_type uevent() returned %d\n", | |
243 | __FUNCTION__, retval); | |
244 | } | |
245 | ||
246 | return retval; | |
247 | } | |
248 | ||
249 | static struct kset_uevent_ops device_uevent_ops = { | |
250 | .filter = dev_uevent_filter, | |
251 | .name = dev_uevent_name, | |
252 | .uevent = dev_uevent, | |
253 | }; | |
254 | ||
255 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, | |
256 | const char *buf, size_t count) | |
257 | { | |
258 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
259 | return count; | |
260 | } | |
261 | ||
262 | static int device_add_groups(struct device *dev) | |
263 | { | |
264 | int i; | |
265 | int error = 0; | |
266 | ||
267 | if (dev->groups) { | |
268 | for (i = 0; dev->groups[i]; i++) { | |
269 | error = sysfs_create_group(&dev->kobj, dev->groups[i]); | |
270 | if (error) { | |
271 | while (--i >= 0) | |
272 | sysfs_remove_group(&dev->kobj, dev->groups[i]); | |
273 | goto out; | |
274 | } | |
275 | } | |
276 | } | |
277 | out: | |
278 | return error; | |
279 | } | |
280 | ||
281 | static void device_remove_groups(struct device *dev) | |
282 | { | |
283 | int i; | |
284 | if (dev->groups) { | |
285 | for (i = 0; dev->groups[i]; i++) { | |
286 | sysfs_remove_group(&dev->kobj, dev->groups[i]); | |
287 | } | |
288 | } | |
289 | } | |
290 | ||
291 | static int device_add_attrs(struct device *dev) | |
292 | { | |
293 | struct class *class = dev->class; | |
294 | struct device_type *type = dev->type; | |
295 | int error = 0; | |
296 | int i; | |
297 | ||
298 | if (class && class->dev_attrs) { | |
299 | for (i = 0; attr_name(class->dev_attrs[i]); i++) { | |
300 | error = device_create_file(dev, &class->dev_attrs[i]); | |
301 | if (error) | |
302 | break; | |
303 | } | |
304 | if (error) | |
305 | while (--i >= 0) | |
306 | device_remove_file(dev, &class->dev_attrs[i]); | |
307 | } | |
308 | ||
309 | if (type && type->attrs) { | |
310 | for (i = 0; attr_name(type->attrs[i]); i++) { | |
311 | error = device_create_file(dev, &type->attrs[i]); | |
312 | if (error) | |
313 | break; | |
314 | } | |
315 | if (error) | |
316 | while (--i >= 0) | |
317 | device_remove_file(dev, &type->attrs[i]); | |
318 | } | |
319 | ||
320 | return error; | |
321 | } | |
322 | ||
323 | static void device_remove_attrs(struct device *dev) | |
324 | { | |
325 | struct class *class = dev->class; | |
326 | struct device_type *type = dev->type; | |
327 | int i; | |
328 | ||
329 | if (class && class->dev_attrs) { | |
330 | for (i = 0; attr_name(class->dev_attrs[i]); i++) | |
331 | device_remove_file(dev, &class->dev_attrs[i]); | |
332 | } | |
333 | ||
334 | if (type && type->attrs) { | |
335 | for (i = 0; attr_name(type->attrs[i]); i++) | |
336 | device_remove_file(dev, &type->attrs[i]); | |
337 | } | |
338 | } | |
339 | ||
340 | ||
341 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, | |
342 | char *buf) | |
343 | { | |
344 | return print_dev_t(buf, dev->devt); | |
345 | } | |
346 | ||
347 | /* | |
348 | * devices_subsys - structure to be registered with kobject core. | |
349 | */ | |
350 | ||
351 | decl_subsys(devices, &ktype_device, &device_uevent_ops); | |
352 | ||
353 | ||
354 | /** | |
355 | * device_create_file - create sysfs attribute file for device. | |
356 | * @dev: device. | |
357 | * @attr: device attribute descriptor. | |
358 | */ | |
359 | ||
360 | int device_create_file(struct device * dev, struct device_attribute * attr) | |
361 | { | |
362 | int error = 0; | |
363 | if (get_device(dev)) { | |
364 | error = sysfs_create_file(&dev->kobj, &attr->attr); | |
365 | put_device(dev); | |
366 | } | |
367 | return error; | |
368 | } | |
369 | ||
370 | /** | |
371 | * device_remove_file - remove sysfs attribute file. | |
372 | * @dev: device. | |
373 | * @attr: device attribute descriptor. | |
374 | */ | |
375 | ||
376 | void device_remove_file(struct device * dev, struct device_attribute * attr) | |
377 | { | |
378 | if (get_device(dev)) { | |
379 | sysfs_remove_file(&dev->kobj, &attr->attr); | |
380 | put_device(dev); | |
381 | } | |
382 | } | |
383 | ||
384 | /** | |
385 | * device_create_bin_file - create sysfs binary attribute file for device. | |
386 | * @dev: device. | |
387 | * @attr: device binary attribute descriptor. | |
388 | */ | |
389 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) | |
390 | { | |
391 | int error = -EINVAL; | |
392 | if (dev) | |
393 | error = sysfs_create_bin_file(&dev->kobj, attr); | |
394 | return error; | |
395 | } | |
396 | EXPORT_SYMBOL_GPL(device_create_bin_file); | |
397 | ||
398 | /** | |
399 | * device_remove_bin_file - remove sysfs binary attribute file | |
400 | * @dev: device. | |
401 | * @attr: device binary attribute descriptor. | |
402 | */ | |
403 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) | |
404 | { | |
405 | if (dev) | |
406 | sysfs_remove_bin_file(&dev->kobj, attr); | |
407 | } | |
408 | EXPORT_SYMBOL_GPL(device_remove_bin_file); | |
409 | ||
410 | static void klist_children_get(struct klist_node *n) | |
411 | { | |
412 | struct device *dev = container_of(n, struct device, knode_parent); | |
413 | ||
414 | get_device(dev); | |
415 | } | |
416 | ||
417 | static void klist_children_put(struct klist_node *n) | |
418 | { | |
419 | struct device *dev = container_of(n, struct device, knode_parent); | |
420 | ||
421 | put_device(dev); | |
422 | } | |
423 | ||
424 | ||
425 | /** | |
426 | * device_initialize - init device structure. | |
427 | * @dev: device. | |
428 | * | |
429 | * This prepares the device for use by other layers, | |
430 | * including adding it to the device hierarchy. | |
431 | * It is the first half of device_register(), if called by | |
432 | * that, though it can also be called separately, so one | |
433 | * may use @dev's fields (e.g. the refcount). | |
434 | */ | |
435 | ||
436 | void device_initialize(struct device *dev) | |
437 | { | |
438 | kobj_set_kset_s(dev, devices_subsys); | |
439 | kobject_init(&dev->kobj); | |
440 | klist_init(&dev->klist_children, klist_children_get, | |
441 | klist_children_put); | |
442 | INIT_LIST_HEAD(&dev->dma_pools); | |
443 | INIT_LIST_HEAD(&dev->node); | |
444 | init_MUTEX(&dev->sem); | |
445 | spin_lock_init(&dev->devres_lock); | |
446 | INIT_LIST_HEAD(&dev->devres_head); | |
447 | device_init_wakeup(dev, 0); | |
448 | set_dev_node(dev, -1); | |
449 | } | |
450 | ||
451 | #ifdef CONFIG_SYSFS_DEPRECATED | |
452 | static struct kobject * get_device_parent(struct device *dev, | |
453 | struct device *parent) | |
454 | { | |
455 | /* Set the parent to the class, not the parent device */ | |
456 | /* this keeps sysfs from having a symlink to make old udevs happy */ | |
457 | if (dev->class) | |
458 | return &dev->class->subsys.kset.kobj; | |
459 | else if (parent) | |
460 | return &parent->kobj; | |
461 | ||
462 | return NULL; | |
463 | } | |
464 | #else | |
465 | static struct kobject * virtual_device_parent(struct device *dev) | |
466 | { | |
467 | if (!dev->class) | |
468 | return ERR_PTR(-ENODEV); | |
469 | ||
470 | if (!dev->class->virtual_dir) { | |
471 | static struct kobject *virtual_dir = NULL; | |
472 | ||
473 | if (!virtual_dir) | |
474 | virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual"); | |
475 | dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name); | |
476 | } | |
477 | ||
478 | return dev->class->virtual_dir; | |
479 | } | |
480 | ||
481 | static struct kobject * get_device_parent(struct device *dev, | |
482 | struct device *parent) | |
483 | { | |
484 | /* if this is a class device, and has no parent, create one */ | |
485 | if ((dev->class) && (parent == NULL)) { | |
486 | return virtual_device_parent(dev); | |
487 | } else if (parent) | |
488 | return &parent->kobj; | |
489 | return NULL; | |
490 | } | |
491 | ||
492 | #endif | |
493 | static int setup_parent(struct device *dev, struct device *parent) | |
494 | { | |
495 | struct kobject *kobj; | |
496 | kobj = get_device_parent(dev, parent); | |
497 | if (IS_ERR(kobj)) | |
498 | return PTR_ERR(kobj); | |
499 | if (kobj) | |
500 | dev->kobj.parent = kobj; | |
501 | return 0; | |
502 | } | |
503 | ||
504 | /** | |
505 | * device_add - add device to device hierarchy. | |
506 | * @dev: device. | |
507 | * | |
508 | * This is part 2 of device_register(), though may be called | |
509 | * separately _iff_ device_initialize() has been called separately. | |
510 | * | |
511 | * This adds it to the kobject hierarchy via kobject_add(), adds it | |
512 | * to the global and sibling lists for the device, then | |
513 | * adds it to the other relevant subsystems of the driver model. | |
514 | */ | |
515 | int device_add(struct device *dev) | |
516 | { | |
517 | struct device *parent = NULL; | |
518 | char *class_name = NULL; | |
519 | struct class_interface *class_intf; | |
520 | int error = -EINVAL; | |
521 | ||
522 | dev = get_device(dev); | |
523 | if (!dev || !strlen(dev->bus_id)) | |
524 | goto Error; | |
525 | ||
526 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); | |
527 | ||
528 | parent = get_device(dev->parent); | |
529 | ||
530 | error = setup_parent(dev, parent); | |
531 | if (error) | |
532 | goto Error; | |
533 | ||
534 | /* first, register with generic layer. */ | |
535 | kobject_set_name(&dev->kobj, "%s", dev->bus_id); | |
536 | error = kobject_add(&dev->kobj); | |
537 | if (error) | |
538 | goto Error; | |
539 | ||
540 | /* notify platform of device entry */ | |
541 | if (platform_notify) | |
542 | platform_notify(dev); | |
543 | ||
544 | /* notify clients of device entry (new way) */ | |
545 | if (dev->bus) | |
546 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
547 | BUS_NOTIFY_ADD_DEVICE, dev); | |
548 | ||
549 | dev->uevent_attr.attr.name = "uevent"; | |
550 | dev->uevent_attr.attr.mode = S_IWUSR; | |
551 | if (dev->driver) | |
552 | dev->uevent_attr.attr.owner = dev->driver->owner; | |
553 | dev->uevent_attr.store = store_uevent; | |
554 | error = device_create_file(dev, &dev->uevent_attr); | |
555 | if (error) | |
556 | goto attrError; | |
557 | ||
558 | if (MAJOR(dev->devt)) { | |
559 | struct device_attribute *attr; | |
560 | attr = kzalloc(sizeof(*attr), GFP_KERNEL); | |
561 | if (!attr) { | |
562 | error = -ENOMEM; | |
563 | goto ueventattrError; | |
564 | } | |
565 | attr->attr.name = "dev"; | |
566 | attr->attr.mode = S_IRUGO; | |
567 | if (dev->driver) | |
568 | attr->attr.owner = dev->driver->owner; | |
569 | attr->show = show_dev; | |
570 | error = device_create_file(dev, attr); | |
571 | if (error) { | |
572 | kfree(attr); | |
573 | goto ueventattrError; | |
574 | } | |
575 | ||
576 | dev->devt_attr = attr; | |
577 | } | |
578 | ||
579 | if (dev->class) { | |
580 | sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj, | |
581 | "subsystem"); | |
582 | /* If this is not a "fake" compatible device, then create the | |
583 | * symlink from the class to the device. */ | |
584 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
585 | sysfs_create_link(&dev->class->subsys.kset.kobj, | |
586 | &dev->kobj, dev->bus_id); | |
587 | if (parent) { | |
588 | sysfs_create_link(&dev->kobj, &dev->parent->kobj, | |
589 | "device"); | |
590 | #ifdef CONFIG_SYSFS_DEPRECATED | |
591 | class_name = make_class_name(dev->class->name, | |
592 | &dev->kobj); | |
593 | if (class_name) | |
594 | sysfs_create_link(&dev->parent->kobj, | |
595 | &dev->kobj, class_name); | |
596 | #endif | |
597 | } | |
598 | } | |
599 | ||
600 | if ((error = device_add_attrs(dev))) | |
601 | goto AttrsError; | |
602 | if ((error = device_add_groups(dev))) | |
603 | goto GroupError; | |
604 | if ((error = device_pm_add(dev))) | |
605 | goto PMError; | |
606 | if ((error = bus_add_device(dev))) | |
607 | goto BusError; | |
608 | if (!dev->uevent_suppress) | |
609 | kobject_uevent(&dev->kobj, KOBJ_ADD); | |
610 | if ((error = bus_attach_device(dev))) | |
611 | goto AttachError; | |
612 | if (parent) | |
613 | klist_add_tail(&dev->knode_parent, &parent->klist_children); | |
614 | ||
615 | if (dev->class) { | |
616 | down(&dev->class->sem); | |
617 | /* tie the class to the device */ | |
618 | list_add_tail(&dev->node, &dev->class->devices); | |
619 | ||
620 | /* notify any interfaces that the device is here */ | |
621 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
622 | if (class_intf->add_dev) | |
623 | class_intf->add_dev(dev, class_intf); | |
624 | up(&dev->class->sem); | |
625 | } | |
626 | Done: | |
627 | kfree(class_name); | |
628 | put_device(dev); | |
629 | return error; | |
630 | AttachError: | |
631 | bus_remove_device(dev); | |
632 | BusError: | |
633 | device_pm_remove(dev); | |
634 | PMError: | |
635 | if (dev->bus) | |
636 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
637 | BUS_NOTIFY_DEL_DEVICE, dev); | |
638 | device_remove_groups(dev); | |
639 | GroupError: | |
640 | device_remove_attrs(dev); | |
641 | AttrsError: | |
642 | if (dev->devt_attr) { | |
643 | device_remove_file(dev, dev->devt_attr); | |
644 | kfree(dev->devt_attr); | |
645 | } | |
646 | ||
647 | if (dev->class) { | |
648 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
649 | /* If this is not a "fake" compatible device, remove the | |
650 | * symlink from the class to the device. */ | |
651 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
652 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
653 | dev->bus_id); | |
654 | if (parent) { | |
655 | #ifdef CONFIG_SYSFS_DEPRECATED | |
656 | char *class_name = make_class_name(dev->class->name, | |
657 | &dev->kobj); | |
658 | if (class_name) | |
659 | sysfs_remove_link(&dev->parent->kobj, | |
660 | class_name); | |
661 | kfree(class_name); | |
662 | #endif | |
663 | sysfs_remove_link(&dev->kobj, "device"); | |
664 | } | |
665 | ||
666 | down(&dev->class->sem); | |
667 | /* notify any interfaces that the device is now gone */ | |
668 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
669 | if (class_intf->remove_dev) | |
670 | class_intf->remove_dev(dev, class_intf); | |
671 | /* remove the device from the class list */ | |
672 | list_del_init(&dev->node); | |
673 | up(&dev->class->sem); | |
674 | } | |
675 | ueventattrError: | |
676 | device_remove_file(dev, &dev->uevent_attr); | |
677 | attrError: | |
678 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); | |
679 | kobject_del(&dev->kobj); | |
680 | Error: | |
681 | if (parent) | |
682 | put_device(parent); | |
683 | goto Done; | |
684 | } | |
685 | ||
686 | ||
687 | /** | |
688 | * device_register - register a device with the system. | |
689 | * @dev: pointer to the device structure | |
690 | * | |
691 | * This happens in two clean steps - initialize the device | |
692 | * and add it to the system. The two steps can be called | |
693 | * separately, but this is the easiest and most common. | |
694 | * I.e. you should only call the two helpers separately if | |
695 | * have a clearly defined need to use and refcount the device | |
696 | * before it is added to the hierarchy. | |
697 | */ | |
698 | ||
699 | int device_register(struct device *dev) | |
700 | { | |
701 | device_initialize(dev); | |
702 | return device_add(dev); | |
703 | } | |
704 | ||
705 | ||
706 | /** | |
707 | * get_device - increment reference count for device. | |
708 | * @dev: device. | |
709 | * | |
710 | * This simply forwards the call to kobject_get(), though | |
711 | * we do take care to provide for the case that we get a NULL | |
712 | * pointer passed in. | |
713 | */ | |
714 | ||
715 | struct device * get_device(struct device * dev) | |
716 | { | |
717 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; | |
718 | } | |
719 | ||
720 | ||
721 | /** | |
722 | * put_device - decrement reference count. | |
723 | * @dev: device in question. | |
724 | */ | |
725 | void put_device(struct device * dev) | |
726 | { | |
727 | if (dev) | |
728 | kobject_put(&dev->kobj); | |
729 | } | |
730 | ||
731 | ||
732 | /** | |
733 | * device_del - delete device from system. | |
734 | * @dev: device. | |
735 | * | |
736 | * This is the first part of the device unregistration | |
737 | * sequence. This removes the device from the lists we control | |
738 | * from here, has it removed from the other driver model | |
739 | * subsystems it was added to in device_add(), and removes it | |
740 | * from the kobject hierarchy. | |
741 | * | |
742 | * NOTE: this should be called manually _iff_ device_add() was | |
743 | * also called manually. | |
744 | */ | |
745 | ||
746 | void device_del(struct device * dev) | |
747 | { | |
748 | struct device * parent = dev->parent; | |
749 | struct class_interface *class_intf; | |
750 | ||
751 | if (parent) | |
752 | klist_del(&dev->knode_parent); | |
753 | if (dev->devt_attr) { | |
754 | device_remove_file(dev, dev->devt_attr); | |
755 | kfree(dev->devt_attr); | |
756 | } | |
757 | if (dev->class) { | |
758 | sysfs_remove_link(&dev->kobj, "subsystem"); | |
759 | /* If this is not a "fake" compatible device, remove the | |
760 | * symlink from the class to the device. */ | |
761 | if (dev->kobj.parent != &dev->class->subsys.kset.kobj) | |
762 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
763 | dev->bus_id); | |
764 | if (parent) { | |
765 | #ifdef CONFIG_SYSFS_DEPRECATED | |
766 | char *class_name = make_class_name(dev->class->name, | |
767 | &dev->kobj); | |
768 | if (class_name) | |
769 | sysfs_remove_link(&dev->parent->kobj, | |
770 | class_name); | |
771 | kfree(class_name); | |
772 | #endif | |
773 | sysfs_remove_link(&dev->kobj, "device"); | |
774 | } | |
775 | ||
776 | down(&dev->class->sem); | |
777 | /* notify any interfaces that the device is now gone */ | |
778 | list_for_each_entry(class_intf, &dev->class->interfaces, node) | |
779 | if (class_intf->remove_dev) | |
780 | class_intf->remove_dev(dev, class_intf); | |
781 | /* remove the device from the class list */ | |
782 | list_del_init(&dev->node); | |
783 | up(&dev->class->sem); | |
784 | } | |
785 | device_remove_file(dev, &dev->uevent_attr); | |
786 | device_remove_groups(dev); | |
787 | device_remove_attrs(dev); | |
788 | bus_remove_device(dev); | |
789 | ||
790 | /* | |
791 | * Some platform devices are driven without driver attached | |
792 | * and managed resources may have been acquired. Make sure | |
793 | * all resources are released. | |
794 | */ | |
795 | devres_release_all(dev); | |
796 | ||
797 | /* Notify the platform of the removal, in case they | |
798 | * need to do anything... | |
799 | */ | |
800 | if (platform_notify_remove) | |
801 | platform_notify_remove(dev); | |
802 | if (dev->bus) | |
803 | blocking_notifier_call_chain(&dev->bus->bus_notifier, | |
804 | BUS_NOTIFY_DEL_DEVICE, dev); | |
805 | device_pm_remove(dev); | |
806 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); | |
807 | kobject_del(&dev->kobj); | |
808 | if (parent) | |
809 | put_device(parent); | |
810 | } | |
811 | ||
812 | /** | |
813 | * device_unregister - unregister device from system. | |
814 | * @dev: device going away. | |
815 | * | |
816 | * We do this in two parts, like we do device_register(). First, | |
817 | * we remove it from all the subsystems with device_del(), then | |
818 | * we decrement the reference count via put_device(). If that | |
819 | * is the final reference count, the device will be cleaned up | |
820 | * via device_release() above. Otherwise, the structure will | |
821 | * stick around until the final reference to the device is dropped. | |
822 | */ | |
823 | void device_unregister(struct device * dev) | |
824 | { | |
825 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); | |
826 | device_del(dev); | |
827 | put_device(dev); | |
828 | } | |
829 | ||
830 | ||
831 | static struct device * next_device(struct klist_iter * i) | |
832 | { | |
833 | struct klist_node * n = klist_next(i); | |
834 | return n ? container_of(n, struct device, knode_parent) : NULL; | |
835 | } | |
836 | ||
837 | /** | |
838 | * device_for_each_child - device child iterator. | |
839 | * @parent: parent struct device. | |
840 | * @data: data for the callback. | |
841 | * @fn: function to be called for each device. | |
842 | * | |
843 | * Iterate over @parent's child devices, and call @fn for each, | |
844 | * passing it @data. | |
845 | * | |
846 | * We check the return of @fn each time. If it returns anything | |
847 | * other than 0, we break out and return that value. | |
848 | */ | |
849 | int device_for_each_child(struct device * parent, void * data, | |
850 | int (*fn)(struct device *, void *)) | |
851 | { | |
852 | struct klist_iter i; | |
853 | struct device * child; | |
854 | int error = 0; | |
855 | ||
856 | klist_iter_init(&parent->klist_children, &i); | |
857 | while ((child = next_device(&i)) && !error) | |
858 | error = fn(child, data); | |
859 | klist_iter_exit(&i); | |
860 | return error; | |
861 | } | |
862 | ||
863 | /** | |
864 | * device_find_child - device iterator for locating a particular device. | |
865 | * @parent: parent struct device | |
866 | * @data: Data to pass to match function | |
867 | * @match: Callback function to check device | |
868 | * | |
869 | * This is similar to the device_for_each_child() function above, but it | |
870 | * returns a reference to a device that is 'found' for later use, as | |
871 | * determined by the @match callback. | |
872 | * | |
873 | * The callback should return 0 if the device doesn't match and non-zero | |
874 | * if it does. If the callback returns non-zero and a reference to the | |
875 | * current device can be obtained, this function will return to the caller | |
876 | * and not iterate over any more devices. | |
877 | */ | |
878 | struct device * device_find_child(struct device *parent, void *data, | |
879 | int (*match)(struct device *, void *)) | |
880 | { | |
881 | struct klist_iter i; | |
882 | struct device *child; | |
883 | ||
884 | if (!parent) | |
885 | return NULL; | |
886 | ||
887 | klist_iter_init(&parent->klist_children, &i); | |
888 | while ((child = next_device(&i))) | |
889 | if (match(child, data) && get_device(child)) | |
890 | break; | |
891 | klist_iter_exit(&i); | |
892 | return child; | |
893 | } | |
894 | ||
895 | int __init devices_init(void) | |
896 | { | |
897 | return subsystem_register(&devices_subsys); | |
898 | } | |
899 | ||
900 | EXPORT_SYMBOL_GPL(device_for_each_child); | |
901 | EXPORT_SYMBOL_GPL(device_find_child); | |
902 | ||
903 | EXPORT_SYMBOL_GPL(device_initialize); | |
904 | EXPORT_SYMBOL_GPL(device_add); | |
905 | EXPORT_SYMBOL_GPL(device_register); | |
906 | ||
907 | EXPORT_SYMBOL_GPL(device_del); | |
908 | EXPORT_SYMBOL_GPL(device_unregister); | |
909 | EXPORT_SYMBOL_GPL(get_device); | |
910 | EXPORT_SYMBOL_GPL(put_device); | |
911 | ||
912 | EXPORT_SYMBOL_GPL(device_create_file); | |
913 | EXPORT_SYMBOL_GPL(device_remove_file); | |
914 | ||
915 | ||
916 | static void device_create_release(struct device *dev) | |
917 | { | |
918 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); | |
919 | kfree(dev); | |
920 | } | |
921 | ||
922 | /** | |
923 | * device_create - creates a device and registers it with sysfs | |
924 | * @class: pointer to the struct class that this device should be registered to | |
925 | * @parent: pointer to the parent struct device of this new device, if any | |
926 | * @devt: the dev_t for the char device to be added | |
927 | * @fmt: string for the device's name | |
928 | * | |
929 | * This function can be used by char device classes. A struct device | |
930 | * will be created in sysfs, registered to the specified class. | |
931 | * | |
932 | * A "dev" file will be created, showing the dev_t for the device, if | |
933 | * the dev_t is not 0,0. | |
934 | * If a pointer to a parent struct device is passed in, the newly created | |
935 | * struct device will be a child of that device in sysfs. | |
936 | * The pointer to the struct device will be returned from the call. | |
937 | * Any further sysfs files that might be required can be created using this | |
938 | * pointer. | |
939 | * | |
940 | * Note: the struct class passed to this function must have previously | |
941 | * been created with a call to class_create(). | |
942 | */ | |
943 | struct device *device_create(struct class *class, struct device *parent, | |
944 | dev_t devt, const char *fmt, ...) | |
945 | { | |
946 | va_list args; | |
947 | struct device *dev = NULL; | |
948 | int retval = -ENODEV; | |
949 | ||
950 | if (class == NULL || IS_ERR(class)) | |
951 | goto error; | |
952 | ||
953 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
954 | if (!dev) { | |
955 | retval = -ENOMEM; | |
956 | goto error; | |
957 | } | |
958 | ||
959 | dev->devt = devt; | |
960 | dev->class = class; | |
961 | dev->parent = parent; | |
962 | dev->release = device_create_release; | |
963 | ||
964 | va_start(args, fmt); | |
965 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); | |
966 | va_end(args); | |
967 | retval = device_register(dev); | |
968 | if (retval) | |
969 | goto error; | |
970 | ||
971 | return dev; | |
972 | ||
973 | error: | |
974 | kfree(dev); | |
975 | return ERR_PTR(retval); | |
976 | } | |
977 | EXPORT_SYMBOL_GPL(device_create); | |
978 | ||
979 | /** | |
980 | * device_destroy - removes a device that was created with device_create() | |
981 | * @class: pointer to the struct class that this device was registered with | |
982 | * @devt: the dev_t of the device that was previously registered | |
983 | * | |
984 | * This call unregisters and cleans up a device that was created with a | |
985 | * call to device_create(). | |
986 | */ | |
987 | void device_destroy(struct class *class, dev_t devt) | |
988 | { | |
989 | struct device *dev = NULL; | |
990 | struct device *dev_tmp; | |
991 | ||
992 | down(&class->sem); | |
993 | list_for_each_entry(dev_tmp, &class->devices, node) { | |
994 | if (dev_tmp->devt == devt) { | |
995 | dev = dev_tmp; | |
996 | break; | |
997 | } | |
998 | } | |
999 | up(&class->sem); | |
1000 | ||
1001 | if (dev) | |
1002 | device_unregister(dev); | |
1003 | } | |
1004 | EXPORT_SYMBOL_GPL(device_destroy); | |
1005 | ||
1006 | /** | |
1007 | * device_rename - renames a device | |
1008 | * @dev: the pointer to the struct device to be renamed | |
1009 | * @new_name: the new name of the device | |
1010 | */ | |
1011 | int device_rename(struct device *dev, char *new_name) | |
1012 | { | |
1013 | char *old_class_name = NULL; | |
1014 | char *new_class_name = NULL; | |
1015 | char *old_symlink_name = NULL; | |
1016 | int error; | |
1017 | ||
1018 | dev = get_device(dev); | |
1019 | if (!dev) | |
1020 | return -EINVAL; | |
1021 | ||
1022 | pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); | |
1023 | ||
1024 | #ifdef CONFIG_SYSFS_DEPRECATED | |
1025 | if ((dev->class) && (dev->parent)) | |
1026 | old_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1027 | #endif | |
1028 | ||
1029 | if (dev->class) { | |
1030 | old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); | |
1031 | if (!old_symlink_name) { | |
1032 | error = -ENOMEM; | |
1033 | goto out_free_old_class; | |
1034 | } | |
1035 | strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE); | |
1036 | } | |
1037 | ||
1038 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); | |
1039 | ||
1040 | error = kobject_rename(&dev->kobj, new_name); | |
1041 | ||
1042 | #ifdef CONFIG_SYSFS_DEPRECATED | |
1043 | if (old_class_name) { | |
1044 | new_class_name = make_class_name(dev->class->name, &dev->kobj); | |
1045 | if (new_class_name) { | |
1046 | sysfs_create_link(&dev->parent->kobj, &dev->kobj, | |
1047 | new_class_name); | |
1048 | sysfs_remove_link(&dev->parent->kobj, old_class_name); | |
1049 | } | |
1050 | } | |
1051 | #endif | |
1052 | ||
1053 | if (dev->class) { | |
1054 | sysfs_remove_link(&dev->class->subsys.kset.kobj, | |
1055 | old_symlink_name); | |
1056 | sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj, | |
1057 | dev->bus_id); | |
1058 | } | |
1059 | put_device(dev); | |
1060 | ||
1061 | kfree(new_class_name); | |
1062 | kfree(old_symlink_name); | |
1063 | out_free_old_class: | |
1064 | kfree(old_class_name); | |
1065 | ||
1066 | return error; | |
1067 | } | |
1068 | ||
1069 | ||
1070 | static int device_move_class_links(struct device *dev, | |
1071 | struct device *old_parent, | |
1072 | struct device *new_parent) | |
1073 | { | |
1074 | int error = 0; | |
1075 | #ifdef CONFIG_SYSFS_DEPRECATED | |
1076 | char *class_name; | |
1077 | ||
1078 | class_name = make_class_name(dev->class->name, &dev->kobj); | |
1079 | if (!class_name) { | |
1080 | error = -ENOMEM; | |
1081 | goto out; | |
1082 | } | |
1083 | if (old_parent) { | |
1084 | sysfs_remove_link(&dev->kobj, "device"); | |
1085 | sysfs_remove_link(&old_parent->kobj, class_name); | |
1086 | } | |
1087 | if (new_parent) { | |
1088 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1089 | "device"); | |
1090 | if (error) | |
1091 | goto out; | |
1092 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, | |
1093 | class_name); | |
1094 | if (error) | |
1095 | sysfs_remove_link(&dev->kobj, "device"); | |
1096 | } | |
1097 | else | |
1098 | error = 0; | |
1099 | out: | |
1100 | kfree(class_name); | |
1101 | return error; | |
1102 | #else | |
1103 | if (old_parent) | |
1104 | sysfs_remove_link(&dev->kobj, "device"); | |
1105 | if (new_parent) | |
1106 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, | |
1107 | "device"); | |
1108 | return error; | |
1109 | #endif | |
1110 | } | |
1111 | ||
1112 | /** | |
1113 | * device_move - moves a device to a new parent | |
1114 | * @dev: the pointer to the struct device to be moved | |
1115 | * @new_parent: the new parent of the device (can by NULL) | |
1116 | */ | |
1117 | int device_move(struct device *dev, struct device *new_parent) | |
1118 | { | |
1119 | int error; | |
1120 | struct device *old_parent; | |
1121 | struct kobject *new_parent_kobj; | |
1122 | ||
1123 | dev = get_device(dev); | |
1124 | if (!dev) | |
1125 | return -EINVAL; | |
1126 | ||
1127 | new_parent = get_device(new_parent); | |
1128 | new_parent_kobj = get_device_parent (dev, new_parent); | |
1129 | if (IS_ERR(new_parent_kobj)) { | |
1130 | error = PTR_ERR(new_parent_kobj); | |
1131 | put_device(new_parent); | |
1132 | goto out; | |
1133 | } | |
1134 | pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, | |
1135 | new_parent ? new_parent->bus_id : "<NULL>"); | |
1136 | error = kobject_move(&dev->kobj, new_parent_kobj); | |
1137 | if (error) { | |
1138 | put_device(new_parent); | |
1139 | goto out; | |
1140 | } | |
1141 | old_parent = dev->parent; | |
1142 | dev->parent = new_parent; | |
1143 | if (old_parent) | |
1144 | klist_remove(&dev->knode_parent); | |
1145 | if (new_parent) | |
1146 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); | |
1147 | if (!dev->class) | |
1148 | goto out_put; | |
1149 | error = device_move_class_links(dev, old_parent, new_parent); | |
1150 | if (error) { | |
1151 | /* We ignore errors on cleanup since we're hosed anyway... */ | |
1152 | device_move_class_links(dev, new_parent, old_parent); | |
1153 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { | |
1154 | if (new_parent) | |
1155 | klist_remove(&dev->knode_parent); | |
1156 | if (old_parent) | |
1157 | klist_add_tail(&dev->knode_parent, | |
1158 | &old_parent->klist_children); | |
1159 | } | |
1160 | put_device(new_parent); | |
1161 | goto out; | |
1162 | } | |
1163 | out_put: | |
1164 | put_device(old_parent); | |
1165 | out: | |
1166 | put_device(dev); | |
1167 | return error; | |
1168 | } | |
1169 | ||
1170 | EXPORT_SYMBOL_GPL(device_move); |