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13#include <linux/device.h>
14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/init.h>
17#include <linux/string.h>
18#include "base.h"
19#include "power/power.h"
20
21#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
22#define to_bus(obj) container_of(obj, struct bus_type_private, subsys.kobj)
23
24
25
26
27
28#define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr)
29
30
31static int __must_check bus_rescan_devices_helper(struct device *dev,
32 void *data);
33
34static struct bus_type *bus_get(struct bus_type *bus)
35{
36 if (bus) {
37 kset_get(&bus->p->subsys);
38 return bus;
39 }
40 return NULL;
41}
42
43static void bus_put(struct bus_type *bus)
44{
45 if (bus)
46 kset_put(&bus->p->subsys);
47}
48
49static ssize_t drv_attr_show(struct kobject *kobj, struct attribute *attr,
50 char *buf)
51{
52 struct driver_attribute *drv_attr = to_drv_attr(attr);
53 struct driver_private *drv_priv = to_driver(kobj);
54 ssize_t ret = -EIO;
55
56 if (drv_attr->show)
57 ret = drv_attr->show(drv_priv->driver, buf);
58 return ret;
59}
60
61static ssize_t drv_attr_store(struct kobject *kobj, struct attribute *attr,
62 const char *buf, size_t count)
63{
64 struct driver_attribute *drv_attr = to_drv_attr(attr);
65 struct driver_private *drv_priv = to_driver(kobj);
66 ssize_t ret = -EIO;
67
68 if (drv_attr->store)
69 ret = drv_attr->store(drv_priv->driver, buf, count);
70 return ret;
71}
72
73static struct sysfs_ops driver_sysfs_ops = {
74 .show = drv_attr_show,
75 .store = drv_attr_store,
76};
77
78static void driver_release(struct kobject *kobj)
79{
80 struct driver_private *drv_priv = to_driver(kobj);
81
82 pr_debug("driver: '%s': %s\n", kobject_name(kobj), __func__);
83 kfree(drv_priv);
84}
85
86static struct kobj_type driver_ktype = {
87 .sysfs_ops = &driver_sysfs_ops,
88 .release = driver_release,
89};
90
91
92
93
94static ssize_t bus_attr_show(struct kobject *kobj, struct attribute *attr,
95 char *buf)
96{
97 struct bus_attribute *bus_attr = to_bus_attr(attr);
98 struct bus_type_private *bus_priv = to_bus(kobj);
99 ssize_t ret = 0;
100
101 if (bus_attr->show)
102 ret = bus_attr->show(bus_priv->bus, buf);
103 return ret;
104}
105
106static ssize_t bus_attr_store(struct kobject *kobj, struct attribute *attr,
107 const char *buf, size_t count)
108{
109 struct bus_attribute *bus_attr = to_bus_attr(attr);
110 struct bus_type_private *bus_priv = to_bus(kobj);
111 ssize_t ret = 0;
112
113 if (bus_attr->store)
114 ret = bus_attr->store(bus_priv->bus, buf, count);
115 return ret;
116}
117
118static struct sysfs_ops bus_sysfs_ops = {
119 .show = bus_attr_show,
120 .store = bus_attr_store,
121};
122
123int bus_create_file(struct bus_type *bus, struct bus_attribute *attr)
124{
125 int error;
126 if (bus_get(bus)) {
127 error = sysfs_create_file(&bus->p->subsys.kobj, &attr->attr);
128 bus_put(bus);
129 } else
130 error = -EINVAL;
131 return error;
132}
133EXPORT_SYMBOL_GPL(bus_create_file);
134
135void bus_remove_file(struct bus_type *bus, struct bus_attribute *attr)
136{
137 if (bus_get(bus)) {
138 sysfs_remove_file(&bus->p->subsys.kobj, &attr->attr);
139 bus_put(bus);
140 }
141}
142EXPORT_SYMBOL_GPL(bus_remove_file);
143
144static struct kobj_type bus_ktype = {
145 .sysfs_ops = &bus_sysfs_ops,
146};
147
148static int bus_uevent_filter(struct kset *kset, struct kobject *kobj)
149{
150 struct kobj_type *ktype = get_ktype(kobj);
151
152 if (ktype == &bus_ktype)
153 return 1;
154 return 0;
155}
156
157static struct kset_uevent_ops bus_uevent_ops = {
158 .filter = bus_uevent_filter,
159};
160
161static struct kset *bus_kset;
162
163
164#ifdef CONFIG_HOTPLUG
165
166static ssize_t driver_unbind(struct device_driver *drv,
167 const char *buf, size_t count)
168{
169 struct bus_type *bus = bus_get(drv->bus);
170 struct device *dev;
171 int err = -ENODEV;
172
173 dev = bus_find_device_by_name(bus, NULL, buf);
174 if (dev && dev->driver == drv) {
175 if (dev->parent)
176 down(&dev->parent->sem);
177 device_release_driver(dev);
178 if (dev->parent)
179 up(&dev->parent->sem);
180 err = count;
181 }
182 put_device(dev);
183 bus_put(bus);
184 return err;
185}
186static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind);
187
188
189
190
191
192
193static ssize_t driver_bind(struct device_driver *drv,
194 const char *buf, size_t count)
195{
196 struct bus_type *bus = bus_get(drv->bus);
197 struct device *dev;
198 int err = -ENODEV;
199
200 dev = bus_find_device_by_name(bus, NULL, buf);
201 if (dev && dev->driver == NULL && driver_match_device(drv, dev)) {
202 if (dev->parent)
203 down(&dev->parent->sem);
204 down(&dev->sem);
205 err = driver_probe_device(drv, dev);
206 up(&dev->sem);
207 if (dev->parent)
208 up(&dev->parent->sem);
209
210 if (err > 0) {
211
212 err = count;
213 } else if (err == 0) {
214
215 err = -ENODEV;
216 }
217 }
218 put_device(dev);
219 bus_put(bus);
220 return err;
221}
222static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind);
223
224static ssize_t show_drivers_autoprobe(struct bus_type *bus, char *buf)
225{
226 return sprintf(buf, "%d\n", bus->p->drivers_autoprobe);
227}
228
229static ssize_t store_drivers_autoprobe(struct bus_type *bus,
230 const char *buf, size_t count)
231{
232 if (buf[0] == '0')
233 bus->p->drivers_autoprobe = 0;
234 else
235 bus->p->drivers_autoprobe = 1;
236 return count;
237}
238
239static ssize_t store_drivers_probe(struct bus_type *bus,
240 const char *buf, size_t count)
241{
242 struct device *dev;
243
244 dev = bus_find_device_by_name(bus, NULL, buf);
245 if (!dev)
246 return -ENODEV;
247 if (bus_rescan_devices_helper(dev, NULL) != 0)
248 return -EINVAL;
249 return count;
250}
251#endif
252
253static struct device *next_device(struct klist_iter *i)
254{
255 struct klist_node *n = klist_next(i);
256 struct device *dev = NULL;
257 struct device_private *dev_prv;
258
259 if (n) {
260 dev_prv = to_device_private_bus(n);
261 dev = dev_prv->device;
262 }
263 return dev;
264}
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283
284
285int bus_for_each_dev(struct bus_type *bus, struct device *start,
286 void *data, int (*fn)(struct device *, void *))
287{
288 struct klist_iter i;
289 struct device *dev;
290 int error = 0;
291
292 if (!bus)
293 return -EINVAL;
294
295 klist_iter_init_node(&bus->p->klist_devices, &i,
296 (start ? &start->p->knode_bus : NULL));
297 while ((dev = next_device(&i)) && !error)
298 error = fn(dev, data);
299 klist_iter_exit(&i);
300 return error;
301}
302EXPORT_SYMBOL_GPL(bus_for_each_dev);
303
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317
318
319struct device *bus_find_device(struct bus_type *bus,
320 struct device *start, void *data,
321 int (*match)(struct device *dev, void *data))
322{
323 struct klist_iter i;
324 struct device *dev;
325
326 if (!bus)
327 return NULL;
328
329 klist_iter_init_node(&bus->p->klist_devices, &i,
330 (start ? &start->p->knode_bus : NULL));
331 while ((dev = next_device(&i)))
332 if (match(dev, data) && get_device(dev))
333 break;
334 klist_iter_exit(&i);
335 return dev;
336}
337EXPORT_SYMBOL_GPL(bus_find_device);
338
339static int match_name(struct device *dev, void *data)
340{
341 const char *name = data;
342
343 return sysfs_streq(name, dev_name(dev));
344}
345
346
347
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354
355
356struct device *bus_find_device_by_name(struct bus_type *bus,
357 struct device *start, const char *name)
358{
359 return bus_find_device(bus, start, (void *)name, match_name);
360}
361EXPORT_SYMBOL_GPL(bus_find_device_by_name);
362
363static struct device_driver *next_driver(struct klist_iter *i)
364{
365 struct klist_node *n = klist_next(i);
366 struct driver_private *drv_priv;
367
368 if (n) {
369 drv_priv = container_of(n, struct driver_private, knode_bus);
370 return drv_priv->driver;
371 }
372 return NULL;
373}
374
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393
394int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
395 void *data, int (*fn)(struct device_driver *, void *))
396{
397 struct klist_iter i;
398 struct device_driver *drv;
399 int error = 0;
400
401 if (!bus)
402 return -EINVAL;
403
404 klist_iter_init_node(&bus->p->klist_drivers, &i,
405 start ? &start->p->knode_bus : NULL);
406 while ((drv = next_driver(&i)) && !error)
407 error = fn(drv, data);
408 klist_iter_exit(&i);
409 return error;
410}
411EXPORT_SYMBOL_GPL(bus_for_each_drv);
412
413static int device_add_attrs(struct bus_type *bus, struct device *dev)
414{
415 int error = 0;
416 int i;
417
418 if (!bus->dev_attrs)
419 return 0;
420
421 for (i = 0; attr_name(bus->dev_attrs[i]); i++) {
422 error = device_create_file(dev, &bus->dev_attrs[i]);
423 if (error) {
424 while (--i >= 0)
425 device_remove_file(dev, &bus->dev_attrs[i]);
426 break;
427 }
428 }
429 return error;
430}
431
432static void device_remove_attrs(struct bus_type *bus, struct device *dev)
433{
434 int i;
435
436 if (bus->dev_attrs) {
437 for (i = 0; attr_name(bus->dev_attrs[i]); i++)
438 device_remove_file(dev, &bus->dev_attrs[i]);
439 }
440}
441
442#ifdef CONFIG_SYSFS_DEPRECATED
443static int make_deprecated_bus_links(struct device *dev)
444{
445 return sysfs_create_link(&dev->kobj,
446 &dev->bus->p->subsys.kobj, "bus");
447}
448
449static void remove_deprecated_bus_links(struct device *dev)
450{
451 sysfs_remove_link(&dev->kobj, "bus");
452}
453#else
454static inline int make_deprecated_bus_links(struct device *dev) { return 0; }
455static inline void remove_deprecated_bus_links(struct device *dev) { }
456#endif
457
458
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460
461
462
463
464
465
466int bus_add_device(struct device *dev)
467{
468 struct bus_type *bus = bus_get(dev->bus);
469 int error = 0;
470
471 if (bus) {
472 pr_debug("bus: '%s': add device %s\n", bus->name, dev_name(dev));
473 error = device_add_attrs(bus, dev);
474 if (error)
475 goto out_put;
476 error = sysfs_create_link(&bus->p->devices_kset->kobj,
477 &dev->kobj, dev_name(dev));
478 if (error)
479 goto out_id;
480 error = sysfs_create_link(&dev->kobj,
481 &dev->bus->p->subsys.kobj, "subsystem");
482 if (error)
483 goto out_subsys;
484 error = make_deprecated_bus_links(dev);
485 if (error)
486 goto out_deprecated;
487 klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices);
488 }
489 return 0;
490
491out_deprecated:
492 sysfs_remove_link(&dev->kobj, "subsystem");
493out_subsys:
494 sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev));
495out_id:
496 device_remove_attrs(bus, dev);
497out_put:
498 bus_put(dev->bus);
499 return error;
500}
501
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505
506
507
508void bus_probe_device(struct device *dev)
509{
510 struct bus_type *bus = dev->bus;
511 int ret;
512
513 if (bus && bus->p->drivers_autoprobe) {
514 ret = device_attach(dev);
515 WARN_ON(ret < 0);
516 }
517}
518
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527
528void bus_remove_device(struct device *dev)
529{
530 if (dev->bus) {
531 sysfs_remove_link(&dev->kobj, "subsystem");
532 remove_deprecated_bus_links(dev);
533 sysfs_remove_link(&dev->bus->p->devices_kset->kobj,
534 dev_name(dev));
535 device_remove_attrs(dev->bus, dev);
536 if (klist_node_attached(&dev->p->knode_bus))
537 klist_del(&dev->p->knode_bus);
538
539 pr_debug("bus: '%s': remove device %s\n",
540 dev->bus->name, dev_name(dev));
541 device_release_driver(dev);
542 bus_put(dev->bus);
543 }
544}
545
546static int driver_add_attrs(struct bus_type *bus, struct device_driver *drv)
547{
548 int error = 0;
549 int i;
550
551 if (bus->drv_attrs) {
552 for (i = 0; attr_name(bus->drv_attrs[i]); i++) {
553 error = driver_create_file(drv, &bus->drv_attrs[i]);
554 if (error)
555 goto err;
556 }
557 }
558done:
559 return error;
560err:
561 while (--i >= 0)
562 driver_remove_file(drv, &bus->drv_attrs[i]);
563 goto done;
564}
565
566static void driver_remove_attrs(struct bus_type *bus,
567 struct device_driver *drv)
568{
569 int i;
570
571 if (bus->drv_attrs) {
572 for (i = 0; attr_name(bus->drv_attrs[i]); i++)
573 driver_remove_file(drv, &bus->drv_attrs[i]);
574 }
575}
576
577#ifdef CONFIG_HOTPLUG
578
579
580
581
582static int __must_check add_bind_files(struct device_driver *drv)
583{
584 int ret;
585
586 ret = driver_create_file(drv, &driver_attr_unbind);
587 if (ret == 0) {
588 ret = driver_create_file(drv, &driver_attr_bind);
589 if (ret)
590 driver_remove_file(drv, &driver_attr_unbind);
591 }
592 return ret;
593}
594
595static void remove_bind_files(struct device_driver *drv)
596{
597 driver_remove_file(drv, &driver_attr_bind);
598 driver_remove_file(drv, &driver_attr_unbind);
599}
600
601static BUS_ATTR(drivers_probe, S_IWUSR, NULL, store_drivers_probe);
602static BUS_ATTR(drivers_autoprobe, S_IWUSR | S_IRUGO,
603 show_drivers_autoprobe, store_drivers_autoprobe);
604
605static int add_probe_files(struct bus_type *bus)
606{
607 int retval;
608
609 retval = bus_create_file(bus, &bus_attr_drivers_probe);
610 if (retval)
611 goto out;
612
613 retval = bus_create_file(bus, &bus_attr_drivers_autoprobe);
614 if (retval)
615 bus_remove_file(bus, &bus_attr_drivers_probe);
616out:
617 return retval;
618}
619
620static void remove_probe_files(struct bus_type *bus)
621{
622 bus_remove_file(bus, &bus_attr_drivers_autoprobe);
623 bus_remove_file(bus, &bus_attr_drivers_probe);
624}
625#else
626static inline int add_bind_files(struct device_driver *drv) { return 0; }
627static inline void remove_bind_files(struct device_driver *drv) {}
628static inline int add_probe_files(struct bus_type *bus) { return 0; }
629static inline void remove_probe_files(struct bus_type *bus) {}
630#endif
631
632static ssize_t driver_uevent_store(struct device_driver *drv,
633 const char *buf, size_t count)
634{
635 enum kobject_action action;
636
637 if (kobject_action_type(buf, count, &action) == 0)
638 kobject_uevent(&drv->p->kobj, action);
639 return count;
640}
641static DRIVER_ATTR(uevent, S_IWUSR, NULL, driver_uevent_store);
642
643
644
645
646
647int bus_add_driver(struct device_driver *drv)
648{
649 struct bus_type *bus;
650 struct driver_private *priv;
651 int error = 0;
652
653 bus = bus_get(drv->bus);
654 if (!bus)
655 return -EINVAL;
656
657 pr_debug("bus: '%s': add driver %s\n", bus->name, drv->name);
658
659 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
660 if (!priv) {
661 error = -ENOMEM;
662 goto out_put_bus;
663 }
664 klist_init(&priv->klist_devices, NULL, NULL);
665 priv->driver = drv;
666 drv->p = priv;
667 priv->kobj.kset = bus->p->drivers_kset;
668 error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL,
669 "%s", drv->name);
670 if (error)
671 goto out_unregister;
672
673 if (drv->bus->p->drivers_autoprobe) {
674 error = driver_attach(drv);
675 if (error)
676 goto out_unregister;
677 }
678 klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers);
679 module_add_driver(drv->owner, drv);
680
681 error = driver_create_file(drv, &driver_attr_uevent);
682 if (error) {
683 printk(KERN_ERR "%s: uevent attr (%s) failed\n",
684 __func__, drv->name);
685 }
686 error = driver_add_attrs(bus, drv);
687 if (error) {
688
689 printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n",
690 __func__, drv->name);
691 }
692
693 if (!drv->suppress_bind_attrs) {
694 error = add_bind_files(drv);
695 if (error) {
696
697 printk(KERN_ERR "%s: add_bind_files(%s) failed\n",
698 __func__, drv->name);
699 }
700 }
701
702 kobject_uevent(&priv->kobj, KOBJ_ADD);
703 return 0;
704
705out_unregister:
706 kfree(drv->p);
707 drv->p = NULL;
708 kobject_put(&priv->kobj);
709out_put_bus:
710 bus_put(bus);
711 return error;
712}
713
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715
716
717
718
719
720
721
722void bus_remove_driver(struct device_driver *drv)
723{
724 if (!drv->bus)
725 return;
726
727 if (!drv->suppress_bind_attrs)
728 remove_bind_files(drv);
729 driver_remove_attrs(drv->bus, drv);
730 driver_remove_file(drv, &driver_attr_uevent);
731 klist_remove(&drv->p->knode_bus);
732 pr_debug("bus: '%s': remove driver %s\n", drv->bus->name, drv->name);
733 driver_detach(drv);
734 module_remove_driver(drv);
735 kobject_put(&drv->p->kobj);
736 bus_put(drv->bus);
737}
738
739
740static int __must_check bus_rescan_devices_helper(struct device *dev,
741 void *data)
742{
743 int ret = 0;
744
745 if (!dev->driver) {
746 if (dev->parent)
747 down(&dev->parent->sem);
748 ret = device_attach(dev);
749 if (dev->parent)
750 up(&dev->parent->sem);
751 }
752 return ret < 0 ? ret : 0;
753}
754
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760
761
762
763int bus_rescan_devices(struct bus_type *bus)
764{
765 return bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper);
766}
767EXPORT_SYMBOL_GPL(bus_rescan_devices);
768
769
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776
777
778int device_reprobe(struct device *dev)
779{
780 if (dev->driver) {
781 if (dev->parent)
782 down(&dev->parent->sem);
783 device_release_driver(dev);
784 if (dev->parent)
785 up(&dev->parent->sem);
786 }
787 return bus_rescan_devices_helper(dev, NULL);
788}
789EXPORT_SYMBOL_GPL(device_reprobe);
790
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799
800#if 0
801struct bus_type *find_bus(char *name)
802{
803 struct kobject *k = kset_find_obj(bus_kset, name);
804 return k ? to_bus(k) : NULL;
805}
806#endif
807
808
809
810
811
812
813
814static int bus_add_attrs(struct bus_type *bus)
815{
816 int error = 0;
817 int i;
818
819 if (bus->bus_attrs) {
820 for (i = 0; attr_name(bus->bus_attrs[i]); i++) {
821 error = bus_create_file(bus, &bus->bus_attrs[i]);
822 if (error)
823 goto err;
824 }
825 }
826done:
827 return error;
828err:
829 while (--i >= 0)
830 bus_remove_file(bus, &bus->bus_attrs[i]);
831 goto done;
832}
833
834static void bus_remove_attrs(struct bus_type *bus)
835{
836 int i;
837
838 if (bus->bus_attrs) {
839 for (i = 0; attr_name(bus->bus_attrs[i]); i++)
840 bus_remove_file(bus, &bus->bus_attrs[i]);
841 }
842}
843
844static void klist_devices_get(struct klist_node *n)
845{
846 struct device_private *dev_prv = to_device_private_bus(n);
847 struct device *dev = dev_prv->device;
848
849 get_device(dev);
850}
851
852static void klist_devices_put(struct klist_node *n)
853{
854 struct device_private *dev_prv = to_device_private_bus(n);
855 struct device *dev = dev_prv->device;
856
857 put_device(dev);
858}
859
860static ssize_t bus_uevent_store(struct bus_type *bus,
861 const char *buf, size_t count)
862{
863 enum kobject_action action;
864
865 if (kobject_action_type(buf, count, &action) == 0)
866 kobject_uevent(&bus->p->subsys.kobj, action);
867 return count;
868}
869static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
870
871
872
873
874
875
876
877
878
879int bus_register(struct bus_type *bus)
880{
881 int retval;
882 struct bus_type_private *priv;
883
884 priv = kzalloc(sizeof(struct bus_type_private), GFP_KERNEL);
885 if (!priv)
886 return -ENOMEM;
887
888 priv->bus = bus;
889 bus->p = priv;
890
891 BLOCKING_INIT_NOTIFIER_HEAD(&priv->bus_notifier);
892
893 retval = kobject_set_name(&priv->subsys.kobj, "%s", bus->name);
894 if (retval)
895 goto out;
896
897 priv->subsys.kobj.kset = bus_kset;
898 priv->subsys.kobj.ktype = &bus_ktype;
899 priv->drivers_autoprobe = 1;
900
901 retval = kset_register(&priv->subsys);
902 if (retval)
903 goto out;
904
905 retval = bus_create_file(bus, &bus_attr_uevent);
906 if (retval)
907 goto bus_uevent_fail;
908
909 priv->devices_kset = kset_create_and_add("devices", NULL,
910 &priv->subsys.kobj);
911 if (!priv->devices_kset) {
912 retval = -ENOMEM;
913 goto bus_devices_fail;
914 }
915
916 priv->drivers_kset = kset_create_and_add("drivers", NULL,
917 &priv->subsys.kobj);
918 if (!priv->drivers_kset) {
919 retval = -ENOMEM;
920 goto bus_drivers_fail;
921 }
922
923 klist_init(&priv->klist_devices, klist_devices_get, klist_devices_put);
924 klist_init(&priv->klist_drivers, NULL, NULL);
925
926 retval = add_probe_files(bus);
927 if (retval)
928 goto bus_probe_files_fail;
929
930 retval = bus_add_attrs(bus);
931 if (retval)
932 goto bus_attrs_fail;
933
934 pr_debug("bus: '%s': registered\n", bus->name);
935 return 0;
936
937bus_attrs_fail:
938 remove_probe_files(bus);
939bus_probe_files_fail:
940 kset_unregister(bus->p->drivers_kset);
941bus_drivers_fail:
942 kset_unregister(bus->p->devices_kset);
943bus_devices_fail:
944 bus_remove_file(bus, &bus_attr_uevent);
945bus_uevent_fail:
946 kset_unregister(&bus->p->subsys);
947 kfree(bus->p);
948out:
949 bus->p = NULL;
950 return retval;
951}
952EXPORT_SYMBOL_GPL(bus_register);
953
954
955
956
957
958
959
960
961void bus_unregister(struct bus_type *bus)
962{
963 pr_debug("bus: '%s': unregistering\n", bus->name);
964 bus_remove_attrs(bus);
965 remove_probe_files(bus);
966 kset_unregister(bus->p->drivers_kset);
967 kset_unregister(bus->p->devices_kset);
968 bus_remove_file(bus, &bus_attr_uevent);
969 kset_unregister(&bus->p->subsys);
970 kfree(bus->p);
971 bus->p = NULL;
972}
973EXPORT_SYMBOL_GPL(bus_unregister);
974
975int bus_register_notifier(struct bus_type *bus, struct notifier_block *nb)
976{
977 return blocking_notifier_chain_register(&bus->p->bus_notifier, nb);
978}
979EXPORT_SYMBOL_GPL(bus_register_notifier);
980
981int bus_unregister_notifier(struct bus_type *bus, struct notifier_block *nb)
982{
983 return blocking_notifier_chain_unregister(&bus->p->bus_notifier, nb);
984}
985EXPORT_SYMBOL_GPL(bus_unregister_notifier);
986
987struct kset *bus_get_kset(struct bus_type *bus)
988{
989 return &bus->p->subsys;
990}
991EXPORT_SYMBOL_GPL(bus_get_kset);
992
993struct klist *bus_get_device_klist(struct bus_type *bus)
994{
995 return &bus->p->klist_devices;
996}
997EXPORT_SYMBOL_GPL(bus_get_device_klist);
998
999
1000
1001
1002
1003
1004
1005
1006static void device_insertion_sort_klist(struct device *a, struct list_head *list,
1007 int (*compare)(const struct device *a,
1008 const struct device *b))
1009{
1010 struct list_head *pos;
1011 struct klist_node *n;
1012 struct device_private *dev_prv;
1013 struct device *b;
1014
1015 list_for_each(pos, list) {
1016 n = container_of(pos, struct klist_node, n_node);
1017 dev_prv = to_device_private_bus(n);
1018 b = dev_prv->device;
1019 if (compare(a, b) <= 0) {
1020 list_move_tail(&a->p->knode_bus.n_node,
1021 &b->p->knode_bus.n_node);
1022 return;
1023 }
1024 }
1025 list_move_tail(&a->p->knode_bus.n_node, list);
1026}
1027
1028void bus_sort_breadthfirst(struct bus_type *bus,
1029 int (*compare)(const struct device *a,
1030 const struct device *b))
1031{
1032 LIST_HEAD(sorted_devices);
1033 struct list_head *pos, *tmp;
1034 struct klist_node *n;
1035 struct device_private *dev_prv;
1036 struct device *dev;
1037 struct klist *device_klist;
1038
1039 device_klist = bus_get_device_klist(bus);
1040
1041 spin_lock(&device_klist->k_lock);
1042 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1043 n = container_of(pos, struct klist_node, n_node);
1044 dev_prv = to_device_private_bus(n);
1045 dev = dev_prv->device;
1046 device_insertion_sort_klist(dev, &sorted_devices, compare);
1047 }
1048 list_splice(&sorted_devices, &device_klist->k_list);
1049 spin_unlock(&device_klist->k_lock);
1050}
1051EXPORT_SYMBOL_GPL(bus_sort_breadthfirst);
1052
1053int __init buses_init(void)
1054{
1055 bus_kset = kset_create_and_add("bus", &bus_uevent_ops, NULL);
1056 if (!bus_kset)
1057 return -ENOMEM;
1058 return 0;
1059}
1060