]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * bus.c - bus driver management | |
3 | * | |
4 | * Copyright (c) 2002-3 Patrick Mochel | |
5 | * Copyright (c) 2002-3 Open Source Development Labs | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | */ | |
10 | ||
11 | #include <linux/config.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/errno.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/string.h> | |
17 | #include "base.h" | |
18 | #include "power/power.h" | |
19 | ||
1da177e4 LT |
20 | #define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr) |
21 | #define to_bus(obj) container_of(obj, struct bus_type, subsys.kset.kobj) | |
22 | ||
23 | /* | |
24 | * sysfs bindings for drivers | |
25 | */ | |
26 | ||
27 | #define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr) | |
28 | #define to_driver(obj) container_of(obj, struct device_driver, kobj) | |
29 | ||
30 | ||
31 | static ssize_t | |
32 | drv_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
33 | { | |
34 | struct driver_attribute * drv_attr = to_drv_attr(attr); | |
35 | struct device_driver * drv = to_driver(kobj); | |
4a0c20bf | 36 | ssize_t ret = -EIO; |
1da177e4 LT |
37 | |
38 | if (drv_attr->show) | |
39 | ret = drv_attr->show(drv, buf); | |
40 | return ret; | |
41 | } | |
42 | ||
43 | static ssize_t | |
44 | drv_attr_store(struct kobject * kobj, struct attribute * attr, | |
45 | const char * buf, size_t count) | |
46 | { | |
47 | struct driver_attribute * drv_attr = to_drv_attr(attr); | |
48 | struct device_driver * drv = to_driver(kobj); | |
4a0c20bf | 49 | ssize_t ret = -EIO; |
1da177e4 LT |
50 | |
51 | if (drv_attr->store) | |
52 | ret = drv_attr->store(drv, buf, count); | |
53 | return ret; | |
54 | } | |
55 | ||
56 | static struct sysfs_ops driver_sysfs_ops = { | |
57 | .show = drv_attr_show, | |
58 | .store = drv_attr_store, | |
59 | }; | |
60 | ||
61 | ||
62 | static void driver_release(struct kobject * kobj) | |
63 | { | |
64 | struct device_driver * drv = to_driver(kobj); | |
65 | complete(&drv->unloaded); | |
66 | } | |
67 | ||
68 | static struct kobj_type ktype_driver = { | |
69 | .sysfs_ops = &driver_sysfs_ops, | |
70 | .release = driver_release, | |
71 | }; | |
72 | ||
73 | ||
74 | /* | |
75 | * sysfs bindings for buses | |
76 | */ | |
77 | ||
78 | ||
79 | static ssize_t | |
80 | bus_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) | |
81 | { | |
82 | struct bus_attribute * bus_attr = to_bus_attr(attr); | |
83 | struct bus_type * bus = to_bus(kobj); | |
84 | ssize_t ret = 0; | |
85 | ||
86 | if (bus_attr->show) | |
87 | ret = bus_attr->show(bus, buf); | |
88 | return ret; | |
89 | } | |
90 | ||
91 | static ssize_t | |
92 | bus_attr_store(struct kobject * kobj, struct attribute * attr, | |
93 | const char * buf, size_t count) | |
94 | { | |
95 | struct bus_attribute * bus_attr = to_bus_attr(attr); | |
96 | struct bus_type * bus = to_bus(kobj); | |
97 | ssize_t ret = 0; | |
98 | ||
99 | if (bus_attr->store) | |
100 | ret = bus_attr->store(bus, buf, count); | |
101 | return ret; | |
102 | } | |
103 | ||
104 | static struct sysfs_ops bus_sysfs_ops = { | |
105 | .show = bus_attr_show, | |
106 | .store = bus_attr_store, | |
107 | }; | |
108 | ||
109 | int bus_create_file(struct bus_type * bus, struct bus_attribute * attr) | |
110 | { | |
111 | int error; | |
112 | if (get_bus(bus)) { | |
113 | error = sysfs_create_file(&bus->subsys.kset.kobj, &attr->attr); | |
114 | put_bus(bus); | |
115 | } else | |
116 | error = -EINVAL; | |
117 | return error; | |
118 | } | |
119 | ||
120 | void bus_remove_file(struct bus_type * bus, struct bus_attribute * attr) | |
121 | { | |
122 | if (get_bus(bus)) { | |
123 | sysfs_remove_file(&bus->subsys.kset.kobj, &attr->attr); | |
124 | put_bus(bus); | |
125 | } | |
126 | } | |
127 | ||
128 | static struct kobj_type ktype_bus = { | |
129 | .sysfs_ops = &bus_sysfs_ops, | |
130 | ||
131 | }; | |
132 | ||
133 | decl_subsys(bus, &ktype_bus, NULL); | |
134 | ||
1da177e4 | 135 | |
151ef38f GKH |
136 | /* Manually detach a device from it's associated driver. */ |
137 | static int driver_helper(struct device *dev, void *data) | |
138 | { | |
139 | const char *name = data; | |
140 | ||
141 | if (strcmp(name, dev->bus_id) == 0) | |
142 | return 1; | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static ssize_t driver_unbind(struct device_driver *drv, | |
147 | const char *buf, size_t count) | |
148 | { | |
149 | struct bus_type *bus = get_bus(drv->bus); | |
150 | struct device *dev; | |
151 | int err = -ENODEV; | |
152 | ||
153 | dev = bus_find_device(bus, NULL, (void *)buf, driver_helper); | |
154 | if ((dev) && | |
155 | (dev->driver == drv)) { | |
156 | device_release_driver(dev); | |
157 | err = count; | |
158 | } | |
d65da6ea GKH |
159 | if (err) |
160 | return err; | |
161 | return count; | |
151ef38f GKH |
162 | } |
163 | static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind); | |
164 | ||
afdce75f GKH |
165 | /* |
166 | * Manually attach a device to a driver. | |
167 | * Note: the driver must want to bind to the device, | |
168 | * it is not possible to override the driver's id table. | |
169 | */ | |
170 | static ssize_t driver_bind(struct device_driver *drv, | |
171 | const char *buf, size_t count) | |
172 | { | |
173 | struct bus_type *bus = get_bus(drv->bus); | |
174 | struct device *dev; | |
175 | int err = -ENODEV; | |
176 | ||
177 | dev = bus_find_device(bus, NULL, (void *)buf, driver_helper); | |
178 | if ((dev) && | |
179 | (dev->driver == NULL)) { | |
180 | down(&dev->sem); | |
181 | err = driver_probe_device(drv, dev); | |
182 | up(&dev->sem); | |
183 | put_device(dev); | |
184 | } | |
518e6540 GKH |
185 | if (err) |
186 | return err; | |
187 | return count; | |
afdce75f GKH |
188 | } |
189 | static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind); | |
190 | ||
151ef38f | 191 | |
465c7a3a PM |
192 | static struct device * next_device(struct klist_iter * i) |
193 | { | |
194 | struct klist_node * n = klist_next(i); | |
195 | return n ? container_of(n, struct device, knode_bus) : NULL; | |
196 | } | |
197 | ||
1da177e4 LT |
198 | /** |
199 | * bus_for_each_dev - device iterator. | |
200 | * @bus: bus type. | |
201 | * @start: device to start iterating from. | |
202 | * @data: data for the callback. | |
203 | * @fn: function to be called for each device. | |
204 | * | |
205 | * Iterate over @bus's list of devices, and call @fn for each, | |
206 | * passing it @data. If @start is not NULL, we use that device to | |
207 | * begin iterating from. | |
208 | * | |
209 | * We check the return of @fn each time. If it returns anything | |
210 | * other than 0, we break out and return that value. | |
211 | * | |
212 | * NOTE: The device that returns a non-zero value is not retained | |
213 | * in any way, nor is its refcount incremented. If the caller needs | |
214 | * to retain this data, it should do, and increment the reference | |
215 | * count in the supplied callback. | |
216 | */ | |
217 | ||
218 | int bus_for_each_dev(struct bus_type * bus, struct device * start, | |
219 | void * data, int (*fn)(struct device *, void *)) | |
220 | { | |
465c7a3a PM |
221 | struct klist_iter i; |
222 | struct device * dev; | |
223 | int error = 0; | |
1da177e4 | 224 | |
465c7a3a PM |
225 | if (!bus) |
226 | return -EINVAL; | |
227 | ||
228 | klist_iter_init_node(&bus->klist_devices, &i, | |
229 | (start ? &start->knode_bus : NULL)); | |
230 | while ((dev = next_device(&i)) && !error) | |
231 | error = fn(dev, data); | |
232 | klist_iter_exit(&i); | |
233 | return error; | |
1da177e4 LT |
234 | } |
235 | ||
0edb5860 CH |
236 | /** |
237 | * bus_find_device - device iterator for locating a particular device. | |
238 | * @bus: bus type | |
239 | * @start: Device to begin with | |
240 | * @data: Data to pass to match function | |
241 | * @match: Callback function to check device | |
242 | * | |
243 | * This is similar to the bus_for_each_dev() function above, but it | |
244 | * returns a reference to a device that is 'found' for later use, as | |
245 | * determined by the @match callback. | |
246 | * | |
247 | * The callback should return 0 if the device doesn't match and non-zero | |
248 | * if it does. If the callback returns non-zero, this function will | |
249 | * return to the caller and not iterate over any more devices. | |
250 | */ | |
251 | struct device * bus_find_device(struct bus_type *bus, | |
252 | struct device *start, void *data, | |
253 | int (*match)(struct device *, void *)) | |
254 | { | |
255 | struct klist_iter i; | |
256 | struct device *dev; | |
257 | ||
258 | if (!bus) | |
259 | return NULL; | |
260 | ||
261 | klist_iter_init_node(&bus->klist_devices, &i, | |
262 | (start ? &start->knode_bus : NULL)); | |
263 | while ((dev = next_device(&i))) | |
264 | if (match(dev, data) && get_device(dev)) | |
265 | break; | |
266 | klist_iter_exit(&i); | |
267 | return dev; | |
268 | } | |
38fdac3c PM |
269 | |
270 | ||
271 | static struct device_driver * next_driver(struct klist_iter * i) | |
272 | { | |
273 | struct klist_node * n = klist_next(i); | |
274 | return n ? container_of(n, struct device_driver, knode_bus) : NULL; | |
275 | } | |
276 | ||
1da177e4 LT |
277 | /** |
278 | * bus_for_each_drv - driver iterator | |
279 | * @bus: bus we're dealing with. | |
280 | * @start: driver to start iterating on. | |
281 | * @data: data to pass to the callback. | |
282 | * @fn: function to call for each driver. | |
283 | * | |
284 | * This is nearly identical to the device iterator above. | |
285 | * We iterate over each driver that belongs to @bus, and call | |
286 | * @fn for each. If @fn returns anything but 0, we break out | |
287 | * and return it. If @start is not NULL, we use it as the head | |
288 | * of the list. | |
289 | * | |
290 | * NOTE: we don't return the driver that returns a non-zero | |
291 | * value, nor do we leave the reference count incremented for that | |
292 | * driver. If the caller needs to know that info, it must set it | |
293 | * in the callback. It must also be sure to increment the refcount | |
294 | * so it doesn't disappear before returning to the caller. | |
295 | */ | |
296 | ||
297 | int bus_for_each_drv(struct bus_type * bus, struct device_driver * start, | |
298 | void * data, int (*fn)(struct device_driver *, void *)) | |
299 | { | |
38fdac3c PM |
300 | struct klist_iter i; |
301 | struct device_driver * drv; | |
302 | int error = 0; | |
1da177e4 | 303 | |
38fdac3c PM |
304 | if (!bus) |
305 | return -EINVAL; | |
306 | ||
307 | klist_iter_init_node(&bus->klist_drivers, &i, | |
308 | start ? &start->knode_bus : NULL); | |
309 | while ((drv = next_driver(&i)) && !error) | |
310 | error = fn(drv, data); | |
311 | klist_iter_exit(&i); | |
312 | return error; | |
1da177e4 LT |
313 | } |
314 | ||
1da177e4 LT |
315 | static int device_add_attrs(struct bus_type * bus, struct device * dev) |
316 | { | |
317 | int error = 0; | |
318 | int i; | |
319 | ||
320 | if (bus->dev_attrs) { | |
321 | for (i = 0; attr_name(bus->dev_attrs[i]); i++) { | |
322 | error = device_create_file(dev,&bus->dev_attrs[i]); | |
323 | if (error) | |
324 | goto Err; | |
325 | } | |
326 | } | |
327 | Done: | |
328 | return error; | |
329 | Err: | |
330 | while (--i >= 0) | |
331 | device_remove_file(dev,&bus->dev_attrs[i]); | |
332 | goto Done; | |
333 | } | |
334 | ||
335 | ||
336 | static void device_remove_attrs(struct bus_type * bus, struct device * dev) | |
337 | { | |
338 | int i; | |
339 | ||
340 | if (bus->dev_attrs) { | |
341 | for (i = 0; attr_name(bus->dev_attrs[i]); i++) | |
342 | device_remove_file(dev,&bus->dev_attrs[i]); | |
343 | } | |
344 | } | |
345 | ||
346 | ||
347 | /** | |
348 | * bus_add_device - add device to bus | |
349 | * @dev: device being added | |
350 | * | |
351 | * - Add the device to its bus's list of devices. | |
352 | * - Try to attach to driver. | |
353 | * - Create link to device's physical location. | |
354 | */ | |
355 | int bus_add_device(struct device * dev) | |
356 | { | |
357 | struct bus_type * bus = get_bus(dev->bus); | |
358 | int error = 0; | |
359 | ||
360 | if (bus) { | |
1da177e4 | 361 | pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id); |
d377e85b | 362 | device_attach(dev); |
d856f1e3 | 363 | klist_add_tail(&dev->knode_bus, &bus->klist_devices); |
d377e85b | 364 | error = device_add_attrs(bus, dev); |
ca2b94ba HR |
365 | if (!error) { |
366 | sysfs_create_link(&bus->devices.kobj, &dev->kobj, dev->bus_id); | |
367 | sysfs_create_link(&dev->kobj, &dev->bus->subsys.kset.kobj, "bus"); | |
368 | } | |
1da177e4 LT |
369 | } |
370 | return error; | |
371 | } | |
372 | ||
373 | /** | |
374 | * bus_remove_device - remove device from bus | |
375 | * @dev: device to be removed | |
376 | * | |
377 | * - Remove symlink from bus's directory. | |
378 | * - Delete device from bus's list. | |
379 | * - Detach from its driver. | |
380 | * - Drop reference taken in bus_add_device(). | |
381 | */ | |
382 | void bus_remove_device(struct device * dev) | |
383 | { | |
384 | if (dev->bus) { | |
385 | sysfs_remove_link(&dev->kobj, "bus"); | |
386 | sysfs_remove_link(&dev->bus->devices.kobj, dev->bus_id); | |
387 | device_remove_attrs(dev->bus, dev); | |
465c7a3a | 388 | klist_remove(&dev->knode_bus); |
1da177e4 LT |
389 | pr_debug("bus %s: remove device %s\n", dev->bus->name, dev->bus_id); |
390 | device_release_driver(dev); | |
1da177e4 LT |
391 | put_bus(dev->bus); |
392 | } | |
393 | } | |
394 | ||
395 | static int driver_add_attrs(struct bus_type * bus, struct device_driver * drv) | |
396 | { | |
397 | int error = 0; | |
398 | int i; | |
399 | ||
400 | if (bus->drv_attrs) { | |
401 | for (i = 0; attr_name(bus->drv_attrs[i]); i++) { | |
402 | error = driver_create_file(drv, &bus->drv_attrs[i]); | |
403 | if (error) | |
404 | goto Err; | |
405 | } | |
406 | } | |
407 | Done: | |
408 | return error; | |
409 | Err: | |
410 | while (--i >= 0) | |
411 | driver_remove_file(drv, &bus->drv_attrs[i]); | |
412 | goto Done; | |
413 | } | |
414 | ||
415 | ||
416 | static void driver_remove_attrs(struct bus_type * bus, struct device_driver * drv) | |
417 | { | |
418 | int i; | |
419 | ||
420 | if (bus->drv_attrs) { | |
421 | for (i = 0; attr_name(bus->drv_attrs[i]); i++) | |
422 | driver_remove_file(drv, &bus->drv_attrs[i]); | |
423 | } | |
424 | } | |
425 | ||
426 | ||
427 | /** | |
428 | * bus_add_driver - Add a driver to the bus. | |
429 | * @drv: driver. | |
430 | * | |
431 | */ | |
432 | int bus_add_driver(struct device_driver * drv) | |
433 | { | |
434 | struct bus_type * bus = get_bus(drv->bus); | |
435 | int error = 0; | |
436 | ||
437 | if (bus) { | |
438 | pr_debug("bus %s: add driver %s\n", bus->name, drv->name); | |
439 | error = kobject_set_name(&drv->kobj, "%s", drv->name); | |
440 | if (error) { | |
441 | put_bus(bus); | |
442 | return error; | |
443 | } | |
444 | drv->kobj.kset = &bus->drivers; | |
445 | if ((error = kobject_register(&drv->kobj))) { | |
446 | put_bus(bus); | |
447 | return error; | |
448 | } | |
449 | ||
1da177e4 | 450 | driver_attach(drv); |
d856f1e3 | 451 | klist_add_tail(&drv->knode_bus, &bus->klist_drivers); |
1da177e4 LT |
452 | module_add_driver(drv->owner, drv); |
453 | ||
454 | driver_add_attrs(bus, drv); | |
151ef38f | 455 | driver_create_file(drv, &driver_attr_unbind); |
afdce75f | 456 | driver_create_file(drv, &driver_attr_bind); |
1da177e4 LT |
457 | } |
458 | return error; | |
459 | } | |
460 | ||
461 | ||
462 | /** | |
463 | * bus_remove_driver - delete driver from bus's knowledge. | |
464 | * @drv: driver. | |
465 | * | |
466 | * Detach the driver from the devices it controls, and remove | |
467 | * it from its bus's list of drivers. Finally, we drop the reference | |
468 | * to the bus we took in bus_add_driver(). | |
469 | */ | |
470 | ||
471 | void bus_remove_driver(struct device_driver * drv) | |
472 | { | |
473 | if (drv->bus) { | |
afdce75f | 474 | driver_remove_file(drv, &driver_attr_bind); |
151ef38f | 475 | driver_remove_file(drv, &driver_attr_unbind); |
1da177e4 | 476 | driver_remove_attrs(drv->bus, drv); |
38fdac3c | 477 | klist_remove(&drv->knode_bus); |
1da177e4 LT |
478 | pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name); |
479 | driver_detach(drv); | |
1da177e4 LT |
480 | module_remove_driver(drv); |
481 | kobject_unregister(&drv->kobj); | |
482 | put_bus(drv->bus); | |
483 | } | |
484 | } | |
485 | ||
486 | ||
487 | /* Helper for bus_rescan_devices's iter */ | |
488 | static int bus_rescan_devices_helper(struct device *dev, void *data) | |
489 | { | |
23d3d602 GKH |
490 | if (!dev->driver) |
491 | device_attach(dev); | |
1da177e4 LT |
492 | return 0; |
493 | } | |
494 | ||
1da177e4 | 495 | /** |
23d3d602 GKH |
496 | * bus_rescan_devices - rescan devices on the bus for possible drivers |
497 | * @bus: the bus to scan. | |
1da177e4 | 498 | * |
23d3d602 GKH |
499 | * This function will look for devices on the bus with no driver |
500 | * attached and rescan it against existing drivers to see if it matches | |
501 | * any by calling device_attach() for the unbound devices. | |
1da177e4 | 502 | */ |
23d3d602 | 503 | void bus_rescan_devices(struct bus_type * bus) |
1da177e4 | 504 | { |
23d3d602 | 505 | bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper); |
1da177e4 LT |
506 | } |
507 | ||
508 | ||
509 | struct bus_type * get_bus(struct bus_type * bus) | |
510 | { | |
511 | return bus ? container_of(subsys_get(&bus->subsys), struct bus_type, subsys) : NULL; | |
512 | } | |
513 | ||
514 | void put_bus(struct bus_type * bus) | |
515 | { | |
516 | subsys_put(&bus->subsys); | |
517 | } | |
518 | ||
519 | ||
520 | /** | |
521 | * find_bus - locate bus by name. | |
522 | * @name: name of bus. | |
523 | * | |
524 | * Call kset_find_obj() to iterate over list of buses to | |
525 | * find a bus by name. Return bus if found. | |
526 | * | |
527 | * Note that kset_find_obj increments bus' reference count. | |
528 | */ | |
529 | ||
530 | struct bus_type * find_bus(char * name) | |
531 | { | |
532 | struct kobject * k = kset_find_obj(&bus_subsys.kset, name); | |
533 | return k ? to_bus(k) : NULL; | |
534 | } | |
535 | ||
536 | ||
537 | /** | |
538 | * bus_add_attrs - Add default attributes for this bus. | |
539 | * @bus: Bus that has just been registered. | |
540 | */ | |
541 | ||
542 | static int bus_add_attrs(struct bus_type * bus) | |
543 | { | |
544 | int error = 0; | |
545 | int i; | |
546 | ||
547 | if (bus->bus_attrs) { | |
548 | for (i = 0; attr_name(bus->bus_attrs[i]); i++) { | |
549 | if ((error = bus_create_file(bus,&bus->bus_attrs[i]))) | |
550 | goto Err; | |
551 | } | |
552 | } | |
553 | Done: | |
554 | return error; | |
555 | Err: | |
556 | while (--i >= 0) | |
557 | bus_remove_file(bus,&bus->bus_attrs[i]); | |
558 | goto Done; | |
559 | } | |
560 | ||
561 | static void bus_remove_attrs(struct bus_type * bus) | |
562 | { | |
563 | int i; | |
564 | ||
565 | if (bus->bus_attrs) { | |
566 | for (i = 0; attr_name(bus->bus_attrs[i]); i++) | |
567 | bus_remove_file(bus,&bus->bus_attrs[i]); | |
568 | } | |
569 | } | |
570 | ||
34bb61f9 JB |
571 | static void klist_devices_get(struct klist_node *n) |
572 | { | |
573 | struct device *dev = container_of(n, struct device, knode_bus); | |
574 | ||
575 | get_device(dev); | |
576 | } | |
577 | ||
578 | static void klist_devices_put(struct klist_node *n) | |
579 | { | |
580 | struct device *dev = container_of(n, struct device, knode_bus); | |
581 | ||
582 | put_device(dev); | |
583 | } | |
584 | ||
585 | static void klist_drivers_get(struct klist_node *n) | |
586 | { | |
587 | struct device_driver *drv = container_of(n, struct device_driver, | |
588 | knode_bus); | |
589 | ||
590 | get_driver(drv); | |
591 | } | |
592 | ||
593 | static void klist_drivers_put(struct klist_node *n) | |
594 | { | |
595 | struct device_driver *drv = container_of(n, struct device_driver, | |
596 | knode_bus); | |
597 | ||
598 | put_driver(drv); | |
599 | } | |
600 | ||
1da177e4 LT |
601 | /** |
602 | * bus_register - register a bus with the system. | |
603 | * @bus: bus. | |
604 | * | |
605 | * Once we have that, we registered the bus with the kobject | |
606 | * infrastructure, then register the children subsystems it has: | |
607 | * the devices and drivers that belong to the bus. | |
608 | */ | |
609 | int bus_register(struct bus_type * bus) | |
610 | { | |
611 | int retval; | |
612 | ||
613 | retval = kobject_set_name(&bus->subsys.kset.kobj, "%s", bus->name); | |
614 | if (retval) | |
615 | goto out; | |
616 | ||
617 | subsys_set_kset(bus, bus_subsys); | |
618 | retval = subsystem_register(&bus->subsys); | |
619 | if (retval) | |
620 | goto out; | |
621 | ||
622 | kobject_set_name(&bus->devices.kobj, "devices"); | |
623 | bus->devices.subsys = &bus->subsys; | |
624 | retval = kset_register(&bus->devices); | |
625 | if (retval) | |
626 | goto bus_devices_fail; | |
627 | ||
628 | kobject_set_name(&bus->drivers.kobj, "drivers"); | |
629 | bus->drivers.subsys = &bus->subsys; | |
630 | bus->drivers.ktype = &ktype_driver; | |
631 | retval = kset_register(&bus->drivers); | |
632 | if (retval) | |
633 | goto bus_drivers_fail; | |
465c7a3a | 634 | |
34bb61f9 JB |
635 | klist_init(&bus->klist_devices, klist_devices_get, klist_devices_put); |
636 | klist_init(&bus->klist_drivers, klist_drivers_get, klist_drivers_put); | |
1da177e4 LT |
637 | bus_add_attrs(bus); |
638 | ||
639 | pr_debug("bus type '%s' registered\n", bus->name); | |
640 | return 0; | |
641 | ||
642 | bus_drivers_fail: | |
643 | kset_unregister(&bus->devices); | |
644 | bus_devices_fail: | |
645 | subsystem_unregister(&bus->subsys); | |
646 | out: | |
647 | return retval; | |
648 | } | |
649 | ||
650 | ||
651 | /** | |
652 | * bus_unregister - remove a bus from the system | |
653 | * @bus: bus. | |
654 | * | |
655 | * Unregister the child subsystems and the bus itself. | |
656 | * Finally, we call put_bus() to release the refcount | |
657 | */ | |
658 | void bus_unregister(struct bus_type * bus) | |
659 | { | |
660 | pr_debug("bus %s: unregistering\n", bus->name); | |
661 | bus_remove_attrs(bus); | |
662 | kset_unregister(&bus->drivers); | |
663 | kset_unregister(&bus->devices); | |
664 | subsystem_unregister(&bus->subsys); | |
665 | } | |
666 | ||
667 | int __init buses_init(void) | |
668 | { | |
669 | return subsystem_register(&bus_subsys); | |
670 | } | |
671 | ||
672 | ||
673 | EXPORT_SYMBOL_GPL(bus_for_each_dev); | |
0edb5860 | 674 | EXPORT_SYMBOL_GPL(bus_find_device); |
1da177e4 LT |
675 | EXPORT_SYMBOL_GPL(bus_for_each_drv); |
676 | ||
1da177e4 LT |
677 | EXPORT_SYMBOL_GPL(bus_add_device); |
678 | EXPORT_SYMBOL_GPL(bus_remove_device); | |
679 | EXPORT_SYMBOL_GPL(bus_register); | |
680 | EXPORT_SYMBOL_GPL(bus_unregister); | |
681 | EXPORT_SYMBOL_GPL(bus_rescan_devices); | |
682 | EXPORT_SYMBOL_GPL(get_bus); | |
683 | EXPORT_SYMBOL_GPL(put_bus); | |
684 | EXPORT_SYMBOL_GPL(find_bus); | |
685 | ||
686 | EXPORT_SYMBOL_GPL(bus_create_file); | |
687 | EXPORT_SYMBOL_GPL(bus_remove_file); |