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13#include <linux/device.h>
14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/slab.h>
17#include <linux/init.h>
18#include <linux/string.h>
19#include <linux/mutex.h>
20#include <linux/sysfs.h>
21#include "base.h"
22#include "power/power.h"
23
24
25static struct kset *system_kset;
26
27#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
28
29
30
31
32
33#define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr)
34
35
36static int __must_check bus_rescan_devices_helper(struct device *dev,
37 void *data);
38
39static struct bus_type *bus_get(struct bus_type *bus)
40{
41 if (bus) {
42 kset_get(&bus->p->subsys);
43 return bus;
44 }
45 return NULL;
46}
47
48static void bus_put(struct bus_type *bus)
49{
50 if (bus)
51 kset_put(&bus->p->subsys);
52}
53
54static ssize_t drv_attr_show(struct kobject *kobj, struct attribute *attr,
55 char *buf)
56{
57 struct driver_attribute *drv_attr = to_drv_attr(attr);
58 struct driver_private *drv_priv = to_driver(kobj);
59 ssize_t ret = -EIO;
60
61 if (drv_attr->show)
62 ret = drv_attr->show(drv_priv->driver, buf);
63 return ret;
64}
65
66static ssize_t drv_attr_store(struct kobject *kobj, struct attribute *attr,
67 const char *buf, size_t count)
68{
69 struct driver_attribute *drv_attr = to_drv_attr(attr);
70 struct driver_private *drv_priv = to_driver(kobj);
71 ssize_t ret = -EIO;
72
73 if (drv_attr->store)
74 ret = drv_attr->store(drv_priv->driver, buf, count);
75 return ret;
76}
77
78static const struct sysfs_ops driver_sysfs_ops = {
79 .show = drv_attr_show,
80 .store = drv_attr_store,
81};
82
83static void driver_release(struct kobject *kobj)
84{
85 struct driver_private *drv_priv = to_driver(kobj);
86
87 pr_debug("driver: '%s': %s\n", kobject_name(kobj), __func__);
88 kfree(drv_priv);
89}
90
91static struct kobj_type driver_ktype = {
92 .sysfs_ops = &driver_sysfs_ops,
93 .release = driver_release,
94};
95
96
97
98
99static ssize_t bus_attr_show(struct kobject *kobj, struct attribute *attr,
100 char *buf)
101{
102 struct bus_attribute *bus_attr = to_bus_attr(attr);
103 struct subsys_private *subsys_priv = to_subsys_private(kobj);
104 ssize_t ret = 0;
105
106 if (bus_attr->show)
107 ret = bus_attr->show(subsys_priv->bus, buf);
108 return ret;
109}
110
111static ssize_t bus_attr_store(struct kobject *kobj, struct attribute *attr,
112 const char *buf, size_t count)
113{
114 struct bus_attribute *bus_attr = to_bus_attr(attr);
115 struct subsys_private *subsys_priv = to_subsys_private(kobj);
116 ssize_t ret = 0;
117
118 if (bus_attr->store)
119 ret = bus_attr->store(subsys_priv->bus, buf, count);
120 return ret;
121}
122
123static const struct sysfs_ops bus_sysfs_ops = {
124 .show = bus_attr_show,
125 .store = bus_attr_store,
126};
127
128int bus_create_file(struct bus_type *bus, struct bus_attribute *attr)
129{
130 int error;
131 if (bus_get(bus)) {
132 error = sysfs_create_file(&bus->p->subsys.kobj, &attr->attr);
133 bus_put(bus);
134 } else
135 error = -EINVAL;
136 return error;
137}
138EXPORT_SYMBOL_GPL(bus_create_file);
139
140void bus_remove_file(struct bus_type *bus, struct bus_attribute *attr)
141{
142 if (bus_get(bus)) {
143 sysfs_remove_file(&bus->p->subsys.kobj, &attr->attr);
144 bus_put(bus);
145 }
146}
147EXPORT_SYMBOL_GPL(bus_remove_file);
148
149static void bus_release(struct kobject *kobj)
150{
151 struct subsys_private *priv =
152 container_of(kobj, typeof(*priv), subsys.kobj);
153 struct bus_type *bus = priv->bus;
154
155 kfree(priv);
156 bus->p = NULL;
157}
158
159static struct kobj_type bus_ktype = {
160 .sysfs_ops = &bus_sysfs_ops,
161 .release = bus_release,
162};
163
164static int bus_uevent_filter(struct kset *kset, struct kobject *kobj)
165{
166 struct kobj_type *ktype = get_ktype(kobj);
167
168 if (ktype == &bus_ktype)
169 return 1;
170 return 0;
171}
172
173static const struct kset_uevent_ops bus_uevent_ops = {
174 .filter = bus_uevent_filter,
175};
176
177static struct kset *bus_kset;
178
179
180static ssize_t unbind_store(struct device_driver *drv, const char *buf,
181 size_t count)
182{
183 struct bus_type *bus = bus_get(drv->bus);
184 struct device *dev;
185 int err = -ENODEV;
186
187 dev = bus_find_device_by_name(bus, NULL, buf);
188 if (dev && dev->driver == drv) {
189 if (dev->parent)
190 device_lock(dev->parent);
191 device_release_driver(dev);
192 if (dev->parent)
193 device_unlock(dev->parent);
194 err = count;
195 }
196 put_device(dev);
197 bus_put(bus);
198 return err;
199}
200static DRIVER_ATTR_WO(unbind);
201
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205
206
207static ssize_t bind_store(struct device_driver *drv, const char *buf,
208 size_t count)
209{
210 struct bus_type *bus = bus_get(drv->bus);
211 struct device *dev;
212 int err = -ENODEV;
213
214 dev = bus_find_device_by_name(bus, NULL, buf);
215 if (dev && dev->driver == NULL && driver_match_device(drv, dev)) {
216 if (dev->parent)
217 device_lock(dev->parent);
218 device_lock(dev);
219 err = driver_probe_device(drv, dev);
220 device_unlock(dev);
221 if (dev->parent)
222 device_unlock(dev->parent);
223
224 if (err > 0) {
225
226 err = count;
227 } else if (err == 0) {
228
229 err = -ENODEV;
230 }
231 }
232 put_device(dev);
233 bus_put(bus);
234 return err;
235}
236static DRIVER_ATTR_WO(bind);
237
238static ssize_t show_drivers_autoprobe(struct bus_type *bus, char *buf)
239{
240 return sprintf(buf, "%d\n", bus->p->drivers_autoprobe);
241}
242
243static ssize_t store_drivers_autoprobe(struct bus_type *bus,
244 const char *buf, size_t count)
245{
246 if (buf[0] == '0')
247 bus->p->drivers_autoprobe = 0;
248 else
249 bus->p->drivers_autoprobe = 1;
250 return count;
251}
252
253static ssize_t store_drivers_probe(struct bus_type *bus,
254 const char *buf, size_t count)
255{
256 struct device *dev;
257
258 dev = bus_find_device_by_name(bus, NULL, buf);
259 if (!dev)
260 return -ENODEV;
261 if (bus_rescan_devices_helper(dev, NULL) != 0)
262 return -EINVAL;
263 return count;
264}
265
266static struct device *next_device(struct klist_iter *i)
267{
268 struct klist_node *n = klist_next(i);
269 struct device *dev = NULL;
270 struct device_private *dev_prv;
271
272 if (n) {
273 dev_prv = to_device_private_bus(n);
274 dev = dev_prv->device;
275 }
276 return dev;
277}
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298int bus_for_each_dev(struct bus_type *bus, struct device *start,
299 void *data, int (*fn)(struct device *, void *))
300{
301 struct klist_iter i;
302 struct device *dev;
303 int error = 0;
304
305 if (!bus || !bus->p)
306 return -EINVAL;
307
308 klist_iter_init_node(&bus->p->klist_devices, &i,
309 (start ? &start->p->knode_bus : NULL));
310 while ((dev = next_device(&i)) && !error)
311 error = fn(dev, data);
312 klist_iter_exit(&i);
313 return error;
314}
315EXPORT_SYMBOL_GPL(bus_for_each_dev);
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331
332struct device *bus_find_device(struct bus_type *bus,
333 struct device *start, void *data,
334 int (*match)(struct device *dev, void *data))
335{
336 struct klist_iter i;
337 struct device *dev;
338
339 if (!bus || !bus->p)
340 return NULL;
341
342 klist_iter_init_node(&bus->p->klist_devices, &i,
343 (start ? &start->p->knode_bus : NULL));
344 while ((dev = next_device(&i)))
345 if (match(dev, data) && get_device(dev))
346 break;
347 klist_iter_exit(&i);
348 return dev;
349}
350EXPORT_SYMBOL_GPL(bus_find_device);
351
352static int match_name(struct device *dev, void *data)
353{
354 const char *name = data;
355
356 return sysfs_streq(name, dev_name(dev));
357}
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368
369struct device *bus_find_device_by_name(struct bus_type *bus,
370 struct device *start, const char *name)
371{
372 return bus_find_device(bus, start, (void *)name, match_name);
373}
374EXPORT_SYMBOL_GPL(bus_find_device_by_name);
375
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385
386struct device *subsys_find_device_by_id(struct bus_type *subsys, unsigned int id,
387 struct device *hint)
388{
389 struct klist_iter i;
390 struct device *dev;
391
392 if (!subsys)
393 return NULL;
394
395 if (hint) {
396 klist_iter_init_node(&subsys->p->klist_devices, &i, &hint->p->knode_bus);
397 dev = next_device(&i);
398 if (dev && dev->id == id && get_device(dev)) {
399 klist_iter_exit(&i);
400 return dev;
401 }
402 klist_iter_exit(&i);
403 }
404
405 klist_iter_init_node(&subsys->p->klist_devices, &i, NULL);
406 while ((dev = next_device(&i))) {
407 if (dev->id == id && get_device(dev)) {
408 klist_iter_exit(&i);
409 return dev;
410 }
411 }
412 klist_iter_exit(&i);
413 return NULL;
414}
415EXPORT_SYMBOL_GPL(subsys_find_device_by_id);
416
417static struct device_driver *next_driver(struct klist_iter *i)
418{
419 struct klist_node *n = klist_next(i);
420 struct driver_private *drv_priv;
421
422 if (n) {
423 drv_priv = container_of(n, struct driver_private, knode_bus);
424 return drv_priv->driver;
425 }
426 return NULL;
427}
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447
448int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
449 void *data, int (*fn)(struct device_driver *, void *))
450{
451 struct klist_iter i;
452 struct device_driver *drv;
453 int error = 0;
454
455 if (!bus)
456 return -EINVAL;
457
458 klist_iter_init_node(&bus->p->klist_drivers, &i,
459 start ? &start->p->knode_bus : NULL);
460 while ((drv = next_driver(&i)) && !error)
461 error = fn(drv, data);
462 klist_iter_exit(&i);
463 return error;
464}
465EXPORT_SYMBOL_GPL(bus_for_each_drv);
466
467static int device_add_attrs(struct bus_type *bus, struct device *dev)
468{
469 int error = 0;
470 int i;
471
472 if (!bus->dev_attrs)
473 return 0;
474
475 for (i = 0; bus->dev_attrs[i].attr.name; i++) {
476 error = device_create_file(dev, &bus->dev_attrs[i]);
477 if (error) {
478 while (--i >= 0)
479 device_remove_file(dev, &bus->dev_attrs[i]);
480 break;
481 }
482 }
483 return error;
484}
485
486static void device_remove_attrs(struct bus_type *bus, struct device *dev)
487{
488 int i;
489
490 if (bus->dev_attrs) {
491 for (i = 0; bus->dev_attrs[i].attr.name; i++)
492 device_remove_file(dev, &bus->dev_attrs[i]);
493 }
494}
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503
504int bus_add_device(struct device *dev)
505{
506 struct bus_type *bus = bus_get(dev->bus);
507 int error = 0;
508
509 if (bus) {
510 pr_debug("bus: '%s': add device %s\n", bus->name, dev_name(dev));
511 error = device_add_attrs(bus, dev);
512 if (error)
513 goto out_put;
514 error = device_add_groups(dev, bus->dev_groups);
515 if (error)
516 goto out_groups;
517 error = sysfs_create_link(&bus->p->devices_kset->kobj,
518 &dev->kobj, dev_name(dev));
519 if (error)
520 goto out_id;
521 error = sysfs_create_link(&dev->kobj,
522 &dev->bus->p->subsys.kobj, "subsystem");
523 if (error)
524 goto out_subsys;
525 klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices);
526 }
527 return 0;
528
529out_subsys:
530 sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev));
531out_groups:
532 device_remove_groups(dev, bus->dev_groups);
533out_id:
534 device_remove_attrs(bus, dev);
535out_put:
536 bus_put(dev->bus);
537 return error;
538}
539
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545
546void bus_probe_device(struct device *dev)
547{
548 struct bus_type *bus = dev->bus;
549 struct subsys_interface *sif;
550 int ret;
551
552 if (!bus)
553 return;
554
555 if (bus->p->drivers_autoprobe) {
556 ret = device_attach(dev);
557 WARN_ON(ret < 0);
558 }
559
560 mutex_lock(&bus->p->mutex);
561 list_for_each_entry(sif, &bus->p->interfaces, node)
562 if (sif->add_dev)
563 sif->add_dev(dev, sif);
564 mutex_unlock(&bus->p->mutex);
565}
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577void bus_remove_device(struct device *dev)
578{
579 struct bus_type *bus = dev->bus;
580 struct subsys_interface *sif;
581
582 if (!bus)
583 return;
584
585 mutex_lock(&bus->p->mutex);
586 list_for_each_entry(sif, &bus->p->interfaces, node)
587 if (sif->remove_dev)
588 sif->remove_dev(dev, sif);
589 mutex_unlock(&bus->p->mutex);
590
591 sysfs_remove_link(&dev->kobj, "subsystem");
592 sysfs_remove_link(&dev->bus->p->devices_kset->kobj,
593 dev_name(dev));
594 device_remove_attrs(dev->bus, dev);
595 device_remove_groups(dev, dev->bus->dev_groups);
596 if (klist_node_attached(&dev->p->knode_bus))
597 klist_del(&dev->p->knode_bus);
598
599 pr_debug("bus: '%s': remove device %s\n",
600 dev->bus->name, dev_name(dev));
601 device_release_driver(dev);
602 bus_put(dev->bus);
603}
604
605static int __must_check add_bind_files(struct device_driver *drv)
606{
607 int ret;
608
609 ret = driver_create_file(drv, &driver_attr_unbind);
610 if (ret == 0) {
611 ret = driver_create_file(drv, &driver_attr_bind);
612 if (ret)
613 driver_remove_file(drv, &driver_attr_unbind);
614 }
615 return ret;
616}
617
618static void remove_bind_files(struct device_driver *drv)
619{
620 driver_remove_file(drv, &driver_attr_bind);
621 driver_remove_file(drv, &driver_attr_unbind);
622}
623
624static BUS_ATTR(drivers_probe, S_IWUSR, NULL, store_drivers_probe);
625static BUS_ATTR(drivers_autoprobe, S_IWUSR | S_IRUGO,
626 show_drivers_autoprobe, store_drivers_autoprobe);
627
628static int add_probe_files(struct bus_type *bus)
629{
630 int retval;
631
632 retval = bus_create_file(bus, &bus_attr_drivers_probe);
633 if (retval)
634 goto out;
635
636 retval = bus_create_file(bus, &bus_attr_drivers_autoprobe);
637 if (retval)
638 bus_remove_file(bus, &bus_attr_drivers_probe);
639out:
640 return retval;
641}
642
643static void remove_probe_files(struct bus_type *bus)
644{
645 bus_remove_file(bus, &bus_attr_drivers_autoprobe);
646 bus_remove_file(bus, &bus_attr_drivers_probe);
647}
648
649static ssize_t uevent_store(struct device_driver *drv, const char *buf,
650 size_t count)
651{
652 enum kobject_action action;
653
654 if (kobject_action_type(buf, count, &action) == 0)
655 kobject_uevent(&drv->p->kobj, action);
656 return count;
657}
658static DRIVER_ATTR_WO(uevent);
659
660
661
662
663
664int bus_add_driver(struct device_driver *drv)
665{
666 struct bus_type *bus;
667 struct driver_private *priv;
668 int error = 0;
669
670 bus = bus_get(drv->bus);
671 if (!bus)
672 return -EINVAL;
673
674 pr_debug("bus: '%s': add driver %s\n", bus->name, drv->name);
675
676 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
677 if (!priv) {
678 error = -ENOMEM;
679 goto out_put_bus;
680 }
681 klist_init(&priv->klist_devices, NULL, NULL);
682 priv->driver = drv;
683 drv->p = priv;
684 priv->kobj.kset = bus->p->drivers_kset;
685 error = kobject_init_and_add(&priv->kobj, &driver_ktype, NULL,
686 "%s", drv->name);
687 if (error)
688 goto out_unregister;
689
690 klist_add_tail(&priv->knode_bus, &bus->p->klist_drivers);
691 if (drv->bus->p->drivers_autoprobe) {
692 error = driver_attach(drv);
693 if (error)
694 goto out_unregister;
695 }
696 module_add_driver(drv->owner, drv);
697
698 error = driver_create_file(drv, &driver_attr_uevent);
699 if (error) {
700 printk(KERN_ERR "%s: uevent attr (%s) failed\n",
701 __func__, drv->name);
702 }
703 error = driver_add_groups(drv, bus->drv_groups);
704 if (error) {
705
706 printk(KERN_ERR "%s: driver_create_groups(%s) failed\n",
707 __func__, drv->name);
708 }
709
710 if (!drv->suppress_bind_attrs) {
711 error = add_bind_files(drv);
712 if (error) {
713
714 printk(KERN_ERR "%s: add_bind_files(%s) failed\n",
715 __func__, drv->name);
716 }
717 }
718
719 return 0;
720
721out_unregister:
722 kobject_put(&priv->kobj);
723 kfree(drv->p);
724 drv->p = NULL;
725out_put_bus:
726 bus_put(bus);
727 return error;
728}
729
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737
738void bus_remove_driver(struct device_driver *drv)
739{
740 if (!drv->bus)
741 return;
742
743 if (!drv->suppress_bind_attrs)
744 remove_bind_files(drv);
745 driver_remove_groups(drv, drv->bus->drv_groups);
746 driver_remove_file(drv, &driver_attr_uevent);
747 klist_remove(&drv->p->knode_bus);
748 pr_debug("bus: '%s': remove driver %s\n", drv->bus->name, drv->name);
749 driver_detach(drv);
750 module_remove_driver(drv);
751 kobject_put(&drv->p->kobj);
752 bus_put(drv->bus);
753}
754
755
756static int __must_check bus_rescan_devices_helper(struct device *dev,
757 void *data)
758{
759 int ret = 0;
760
761 if (!dev->driver) {
762 if (dev->parent)
763 device_lock(dev->parent);
764 ret = device_attach(dev);
765 if (dev->parent)
766 device_unlock(dev->parent);
767 }
768 return ret < 0 ? ret : 0;
769}
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779int bus_rescan_devices(struct bus_type *bus)
780{
781 return bus_for_each_dev(bus, NULL, NULL, bus_rescan_devices_helper);
782}
783EXPORT_SYMBOL_GPL(bus_rescan_devices);
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793
794int device_reprobe(struct device *dev)
795{
796 if (dev->driver) {
797 if (dev->parent)
798 device_lock(dev->parent);
799 device_release_driver(dev);
800 if (dev->parent)
801 device_unlock(dev->parent);
802 }
803 return bus_rescan_devices_helper(dev, NULL);
804}
805EXPORT_SYMBOL_GPL(device_reprobe);
806
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815
816#if 0
817struct bus_type *find_bus(char *name)
818{
819 struct kobject *k = kset_find_obj(bus_kset, name);
820 return k ? to_bus(k) : NULL;
821}
822#endif
823
824static int bus_add_groups(struct bus_type *bus,
825 const struct attribute_group **groups)
826{
827 return sysfs_create_groups(&bus->p->subsys.kobj, groups);
828}
829
830static void bus_remove_groups(struct bus_type *bus,
831 const struct attribute_group **groups)
832{
833 sysfs_remove_groups(&bus->p->subsys.kobj, groups);
834}
835
836static void klist_devices_get(struct klist_node *n)
837{
838 struct device_private *dev_prv = to_device_private_bus(n);
839 struct device *dev = dev_prv->device;
840
841 get_device(dev);
842}
843
844static void klist_devices_put(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 put_device(dev);
850}
851
852static ssize_t bus_uevent_store(struct bus_type *bus,
853 const char *buf, size_t count)
854{
855 enum kobject_action action;
856
857 if (kobject_action_type(buf, count, &action) == 0)
858 kobject_uevent(&bus->p->subsys.kobj, action);
859 return count;
860}
861static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
862
863
864
865
866
867
868
869
870
871int bus_register(struct bus_type *bus)
872{
873 int retval;
874 struct subsys_private *priv;
875 struct lock_class_key *key = &bus->lock_key;
876
877 priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL);
878 if (!priv)
879 return -ENOMEM;
880
881 priv->bus = bus;
882 bus->p = priv;
883
884 BLOCKING_INIT_NOTIFIER_HEAD(&priv->bus_notifier);
885
886 retval = kobject_set_name(&priv->subsys.kobj, "%s", bus->name);
887 if (retval)
888 goto out;
889
890 priv->subsys.kobj.kset = bus_kset;
891 priv->subsys.kobj.ktype = &bus_ktype;
892 priv->drivers_autoprobe = 1;
893
894 retval = kset_register(&priv->subsys);
895 if (retval)
896 goto out;
897
898 retval = bus_create_file(bus, &bus_attr_uevent);
899 if (retval)
900 goto bus_uevent_fail;
901
902 priv->devices_kset = kset_create_and_add("devices", NULL,
903 &priv->subsys.kobj);
904 if (!priv->devices_kset) {
905 retval = -ENOMEM;
906 goto bus_devices_fail;
907 }
908
909 priv->drivers_kset = kset_create_and_add("drivers", NULL,
910 &priv->subsys.kobj);
911 if (!priv->drivers_kset) {
912 retval = -ENOMEM;
913 goto bus_drivers_fail;
914 }
915
916 INIT_LIST_HEAD(&priv->interfaces);
917 __mutex_init(&priv->mutex, "subsys mutex", key);
918 klist_init(&priv->klist_devices, klist_devices_get, klist_devices_put);
919 klist_init(&priv->klist_drivers, NULL, NULL);
920
921 retval = add_probe_files(bus);
922 if (retval)
923 goto bus_probe_files_fail;
924
925 retval = bus_add_groups(bus, bus->bus_groups);
926 if (retval)
927 goto bus_groups_fail;
928
929 pr_debug("bus: '%s': registered\n", bus->name);
930 return 0;
931
932bus_groups_fail:
933 remove_probe_files(bus);
934bus_probe_files_fail:
935 kset_unregister(bus->p->drivers_kset);
936bus_drivers_fail:
937 kset_unregister(bus->p->devices_kset);
938bus_devices_fail:
939 bus_remove_file(bus, &bus_attr_uevent);
940bus_uevent_fail:
941 kset_unregister(&bus->p->subsys);
942out:
943 kfree(bus->p);
944 bus->p = NULL;
945 return retval;
946}
947EXPORT_SYMBOL_GPL(bus_register);
948
949
950
951
952
953
954
955
956void bus_unregister(struct bus_type *bus)
957{
958 pr_debug("bus: '%s': unregistering\n", bus->name);
959 if (bus->dev_root)
960 device_unregister(bus->dev_root);
961 bus_remove_groups(bus, bus->bus_groups);
962 remove_probe_files(bus);
963 kset_unregister(bus->p->drivers_kset);
964 kset_unregister(bus->p->devices_kset);
965 bus_remove_file(bus, &bus_attr_uevent);
966 kset_unregister(&bus->p->subsys);
967}
968EXPORT_SYMBOL_GPL(bus_unregister);
969
970int bus_register_notifier(struct bus_type *bus, struct notifier_block *nb)
971{
972 return blocking_notifier_chain_register(&bus->p->bus_notifier, nb);
973}
974EXPORT_SYMBOL_GPL(bus_register_notifier);
975
976int bus_unregister_notifier(struct bus_type *bus, struct notifier_block *nb)
977{
978 return blocking_notifier_chain_unregister(&bus->p->bus_notifier, nb);
979}
980EXPORT_SYMBOL_GPL(bus_unregister_notifier);
981
982struct kset *bus_get_kset(struct bus_type *bus)
983{
984 return &bus->p->subsys;
985}
986EXPORT_SYMBOL_GPL(bus_get_kset);
987
988struct klist *bus_get_device_klist(struct bus_type *bus)
989{
990 return &bus->p->klist_devices;
991}
992EXPORT_SYMBOL_GPL(bus_get_device_klist);
993
994
995
996
997
998
999
1000
1001static void device_insertion_sort_klist(struct device *a, struct list_head *list,
1002 int (*compare)(const struct device *a,
1003 const struct device *b))
1004{
1005 struct list_head *pos;
1006 struct klist_node *n;
1007 struct device_private *dev_prv;
1008 struct device *b;
1009
1010 list_for_each(pos, list) {
1011 n = container_of(pos, struct klist_node, n_node);
1012 dev_prv = to_device_private_bus(n);
1013 b = dev_prv->device;
1014 if (compare(a, b) <= 0) {
1015 list_move_tail(&a->p->knode_bus.n_node,
1016 &b->p->knode_bus.n_node);
1017 return;
1018 }
1019 }
1020 list_move_tail(&a->p->knode_bus.n_node, list);
1021}
1022
1023void bus_sort_breadthfirst(struct bus_type *bus,
1024 int (*compare)(const struct device *a,
1025 const struct device *b))
1026{
1027 LIST_HEAD(sorted_devices);
1028 struct list_head *pos, *tmp;
1029 struct klist_node *n;
1030 struct device_private *dev_prv;
1031 struct device *dev;
1032 struct klist *device_klist;
1033
1034 device_klist = bus_get_device_klist(bus);
1035
1036 spin_lock(&device_klist->k_lock);
1037 list_for_each_safe(pos, tmp, &device_klist->k_list) {
1038 n = container_of(pos, struct klist_node, n_node);
1039 dev_prv = to_device_private_bus(n);
1040 dev = dev_prv->device;
1041 device_insertion_sort_klist(dev, &sorted_devices, compare);
1042 }
1043 list_splice(&sorted_devices, &device_klist->k_list);
1044 spin_unlock(&device_klist->k_lock);
1045}
1046EXPORT_SYMBOL_GPL(bus_sort_breadthfirst);
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060void subsys_dev_iter_init(struct subsys_dev_iter *iter, struct bus_type *subsys,
1061 struct device *start, const struct device_type *type)
1062{
1063 struct klist_node *start_knode = NULL;
1064
1065 if (start)
1066 start_knode = &start->p->knode_bus;
1067 klist_iter_init_node(&subsys->p->klist_devices, &iter->ki, start_knode);
1068 iter->type = type;
1069}
1070EXPORT_SYMBOL_GPL(subsys_dev_iter_init);
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter)
1085{
1086 struct klist_node *knode;
1087 struct device *dev;
1088
1089 for (;;) {
1090 knode = klist_next(&iter->ki);
1091 if (!knode)
1092 return NULL;
1093 dev = container_of(knode, struct device_private, knode_bus)->device;
1094 if (!iter->type || iter->type == dev->type)
1095 return dev;
1096 }
1097}
1098EXPORT_SYMBOL_GPL(subsys_dev_iter_next);
1099
1100
1101
1102
1103
1104
1105
1106
1107void subsys_dev_iter_exit(struct subsys_dev_iter *iter)
1108{
1109 klist_iter_exit(&iter->ki);
1110}
1111EXPORT_SYMBOL_GPL(subsys_dev_iter_exit);
1112
1113int subsys_interface_register(struct subsys_interface *sif)
1114{
1115 struct bus_type *subsys;
1116 struct subsys_dev_iter iter;
1117 struct device *dev;
1118
1119 if (!sif || !sif->subsys)
1120 return -ENODEV;
1121
1122 subsys = bus_get(sif->subsys);
1123 if (!subsys)
1124 return -EINVAL;
1125
1126 mutex_lock(&subsys->p->mutex);
1127 list_add_tail(&sif->node, &subsys->p->interfaces);
1128 if (sif->add_dev) {
1129 subsys_dev_iter_init(&iter, subsys, NULL, NULL);
1130 while ((dev = subsys_dev_iter_next(&iter)))
1131 sif->add_dev(dev, sif);
1132 subsys_dev_iter_exit(&iter);
1133 }
1134 mutex_unlock(&subsys->p->mutex);
1135
1136 return 0;
1137}
1138EXPORT_SYMBOL_GPL(subsys_interface_register);
1139
1140void subsys_interface_unregister(struct subsys_interface *sif)
1141{
1142 struct bus_type *subsys;
1143 struct subsys_dev_iter iter;
1144 struct device *dev;
1145
1146 if (!sif || !sif->subsys)
1147 return;
1148
1149 subsys = sif->subsys;
1150
1151 mutex_lock(&subsys->p->mutex);
1152 list_del_init(&sif->node);
1153 if (sif->remove_dev) {
1154 subsys_dev_iter_init(&iter, subsys, NULL, NULL);
1155 while ((dev = subsys_dev_iter_next(&iter)))
1156 sif->remove_dev(dev, sif);
1157 subsys_dev_iter_exit(&iter);
1158 }
1159 mutex_unlock(&subsys->p->mutex);
1160
1161 bus_put(subsys);
1162}
1163EXPORT_SYMBOL_GPL(subsys_interface_unregister);
1164
1165static void system_root_device_release(struct device *dev)
1166{
1167 kfree(dev);
1168}
1169
1170static int subsys_register(struct bus_type *subsys,
1171 const struct attribute_group **groups,
1172 struct kobject *parent_of_root)
1173{
1174 struct device *dev;
1175 int err;
1176
1177 err = bus_register(subsys);
1178 if (err < 0)
1179 return err;
1180
1181 dev = kzalloc(sizeof(struct device), GFP_KERNEL);
1182 if (!dev) {
1183 err = -ENOMEM;
1184 goto err_dev;
1185 }
1186
1187 err = dev_set_name(dev, "%s", subsys->name);
1188 if (err < 0)
1189 goto err_name;
1190
1191 dev->kobj.parent = parent_of_root;
1192 dev->groups = groups;
1193 dev->release = system_root_device_release;
1194
1195 err = device_register(dev);
1196 if (err < 0)
1197 goto err_dev_reg;
1198
1199 subsys->dev_root = dev;
1200 return 0;
1201
1202err_dev_reg:
1203 put_device(dev);
1204 dev = NULL;
1205err_name:
1206 kfree(dev);
1207err_dev:
1208 bus_unregister(subsys);
1209 return err;
1210}
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230int subsys_system_register(struct bus_type *subsys,
1231 const struct attribute_group **groups)
1232{
1233 return subsys_register(subsys, groups, &system_kset->kobj);
1234}
1235EXPORT_SYMBOL_GPL(subsys_system_register);
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248int subsys_virtual_register(struct bus_type *subsys,
1249 const struct attribute_group **groups)
1250{
1251 struct kobject *virtual_dir;
1252
1253 virtual_dir = virtual_device_parent(NULL);
1254 if (!virtual_dir)
1255 return -ENOMEM;
1256
1257 return subsys_register(subsys, groups, virtual_dir);
1258}
1259EXPORT_SYMBOL_GPL(subsys_virtual_register);
1260
1261int __init buses_init(void)
1262{
1263 bus_kset = kset_create_and_add("bus", &bus_uevent_ops, NULL);
1264 if (!bus_kset)
1265 return -ENOMEM;
1266
1267 system_kset = kset_create_and_add("system", NULL, &devices_kset->kobj);
1268 if (!system_kset)
1269 return -ENOMEM;
1270
1271 return 0;
1272}
1273