2 * drivers/base/core.c - core driver model code (device registration, etc)
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.
9 * This file is released under the GPLv2
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>
22 #include <asm/semaphore.h>
25 #include "power/power.h"
27 int (*platform_notify
)(struct device
* dev
) = NULL
;
28 int (*platform_notify_remove
)(struct device
* dev
) = NULL
;
31 * sysfs bindings for devices.
35 * dev_driver_string - Return a device's driver name, if at all possible
36 * @dev: struct device to get the name of
38 * Will return the device's driver's name if it is bound to a device. If
39 * the device is not bound to a device, it will return the name of the bus
40 * it is attached to. If it is not attached to a bus either, an empty
41 * string will be returned.
43 const char *dev_driver_string(struct device
*dev
)
45 return dev
->driver
? dev
->driver
->name
:
46 (dev
->bus
? dev
->bus
->name
: "");
48 EXPORT_SYMBOL(dev_driver_string
);
50 #define to_dev(obj) container_of(obj, struct device, kobj)
51 #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
54 dev_attr_show(struct kobject
* kobj
, struct attribute
* attr
, char * buf
)
56 struct device_attribute
* dev_attr
= to_dev_attr(attr
);
57 struct device
* dev
= to_dev(kobj
);
61 ret
= dev_attr
->show(dev
, dev_attr
, buf
);
66 dev_attr_store(struct kobject
* kobj
, struct attribute
* attr
,
67 const char * buf
, size_t count
)
69 struct device_attribute
* dev_attr
= to_dev_attr(attr
);
70 struct device
* dev
= to_dev(kobj
);
74 ret
= dev_attr
->store(dev
, dev_attr
, buf
, count
);
78 static struct sysfs_ops dev_sysfs_ops
= {
79 .show
= dev_attr_show
,
80 .store
= dev_attr_store
,
85 * device_release - free device structure.
86 * @kobj: device's kobject.
88 * This is called once the reference count for the object
89 * reaches 0. We forward the call to the device's release
90 * method, which should handle actually freeing the structure.
92 static void device_release(struct kobject
* kobj
)
94 struct device
* dev
= to_dev(kobj
);
98 else if (dev
->class && dev
->class->dev_release
)
99 dev
->class->dev_release(dev
);
101 printk(KERN_ERR
"Device '%s' does not have a release() function, "
102 "it is broken and must be fixed.\n",
108 static struct kobj_type ktype_device
= {
109 .release
= device_release
,
110 .sysfs_ops
= &dev_sysfs_ops
,
114 static int dev_uevent_filter(struct kset
*kset
, struct kobject
*kobj
)
116 struct kobj_type
*ktype
= get_ktype(kobj
);
118 if (ktype
== &ktype_device
) {
119 struct device
*dev
= to_dev(kobj
);
128 static const char *dev_uevent_name(struct kset
*kset
, struct kobject
*kobj
)
130 struct device
*dev
= to_dev(kobj
);
133 return dev
->bus
->name
;
135 return dev
->class->name
;
139 static int dev_uevent(struct kset
*kset
, struct kobject
*kobj
, char **envp
,
140 int num_envp
, char *buffer
, int buffer_size
)
142 struct device
*dev
= to_dev(kobj
);
147 /* add the major/minor if present */
148 if (MAJOR(dev
->devt
)) {
149 add_uevent_var(envp
, num_envp
, &i
,
150 buffer
, buffer_size
, &length
,
151 "MAJOR=%u", MAJOR(dev
->devt
));
152 add_uevent_var(envp
, num_envp
, &i
,
153 buffer
, buffer_size
, &length
,
154 "MINOR=%u", MINOR(dev
->devt
));
157 #ifdef CONFIG_SYSFS_DEPRECATED
158 /* add bus name (same as SUBSYSTEM, deprecated) */
160 add_uevent_var(envp
, num_envp
, &i
,
161 buffer
, buffer_size
, &length
,
162 "PHYSDEVBUS=%s", dev
->bus
->name
);
165 /* add driver name (PHYSDEV* values are deprecated)*/
167 add_uevent_var(envp
, num_envp
, &i
,
168 buffer
, buffer_size
, &length
,
169 "DRIVER=%s", dev
->driver
->name
);
170 #ifdef CONFIG_SYSFS_DEPRECATED
171 add_uevent_var(envp
, num_envp
, &i
,
172 buffer
, buffer_size
, &length
,
173 "PHYSDEVDRIVER=%s", dev
->driver
->name
);
177 /* terminate, set to next free slot, shrink available space */
181 buffer
= &buffer
[length
];
182 buffer_size
-= length
;
184 if (dev
->bus
&& dev
->bus
->uevent
) {
185 /* have the bus specific function add its stuff */
186 retval
= dev
->bus
->uevent(dev
, envp
, num_envp
, buffer
, buffer_size
);
188 pr_debug ("%s - uevent() returned %d\n",
189 __FUNCTION__
, retval
);
193 if (dev
->class && dev
->class->dev_uevent
) {
194 /* have the class specific function add its stuff */
195 retval
= dev
->class->dev_uevent(dev
, envp
, num_envp
, buffer
, buffer_size
);
197 pr_debug("%s - dev_uevent() returned %d\n",
198 __FUNCTION__
, retval
);
205 static struct kset_uevent_ops device_uevent_ops
= {
206 .filter
= dev_uevent_filter
,
207 .name
= dev_uevent_name
,
208 .uevent
= dev_uevent
,
211 static ssize_t
store_uevent(struct device
*dev
, struct device_attribute
*attr
,
212 const char *buf
, size_t count
)
214 kobject_uevent(&dev
->kobj
, KOBJ_ADD
);
218 static int device_add_groups(struct device
*dev
)
224 for (i
= 0; dev
->groups
[i
]; i
++) {
225 error
= sysfs_create_group(&dev
->kobj
, dev
->groups
[i
]);
228 sysfs_remove_group(&dev
->kobj
, dev
->groups
[i
]);
237 static void device_remove_groups(struct device
*dev
)
241 for (i
= 0; dev
->groups
[i
]; i
++) {
242 sysfs_remove_group(&dev
->kobj
, dev
->groups
[i
]);
247 static int device_add_attrs(struct device
*dev
)
249 struct class *class = dev
->class;
256 if (class->dev_attrs
) {
257 for (i
= 0; attr_name(class->dev_attrs
[i
]); i
++) {
258 error
= device_create_file(dev
, &class->dev_attrs
[i
]);
265 device_remove_file(dev
, &class->dev_attrs
[i
]);
269 static void device_remove_attrs(struct device
*dev
)
271 struct class *class = dev
->class;
277 if (class->dev_attrs
) {
278 for (i
= 0; attr_name(class->dev_attrs
[i
]); i
++)
279 device_remove_file(dev
, &class->dev_attrs
[i
]);
284 static ssize_t
show_dev(struct device
*dev
, struct device_attribute
*attr
,
287 return print_dev_t(buf
, dev
->devt
);
291 * devices_subsys - structure to be registered with kobject core.
294 decl_subsys(devices
, &ktype_device
, &device_uevent_ops
);
298 * device_create_file - create sysfs attribute file for device.
300 * @attr: device attribute descriptor.
303 int device_create_file(struct device
* dev
, struct device_attribute
* attr
)
306 if (get_device(dev
)) {
307 error
= sysfs_create_file(&dev
->kobj
, &attr
->attr
);
314 * device_remove_file - remove sysfs attribute file.
316 * @attr: device attribute descriptor.
319 void device_remove_file(struct device
* dev
, struct device_attribute
* attr
)
321 if (get_device(dev
)) {
322 sysfs_remove_file(&dev
->kobj
, &attr
->attr
);
328 * device_create_bin_file - create sysfs binary attribute file for device.
330 * @attr: device binary attribute descriptor.
332 int device_create_bin_file(struct device
*dev
, struct bin_attribute
*attr
)
336 error
= sysfs_create_bin_file(&dev
->kobj
, attr
);
339 EXPORT_SYMBOL_GPL(device_create_bin_file
);
342 * device_remove_bin_file - remove sysfs binary attribute file
344 * @attr: device binary attribute descriptor.
346 void device_remove_bin_file(struct device
*dev
, struct bin_attribute
*attr
)
349 sysfs_remove_bin_file(&dev
->kobj
, attr
);
351 EXPORT_SYMBOL_GPL(device_remove_bin_file
);
353 static void klist_children_get(struct klist_node
*n
)
355 struct device
*dev
= container_of(n
, struct device
, knode_parent
);
360 static void klist_children_put(struct klist_node
*n
)
362 struct device
*dev
= container_of(n
, struct device
, knode_parent
);
369 * device_initialize - init device structure.
372 * This prepares the device for use by other layers,
373 * including adding it to the device hierarchy.
374 * It is the first half of device_register(), if called by
375 * that, though it can also be called separately, so one
376 * may use @dev's fields (e.g. the refcount).
379 void device_initialize(struct device
*dev
)
381 kobj_set_kset_s(dev
, devices_subsys
);
382 kobject_init(&dev
->kobj
);
383 klist_init(&dev
->klist_children
, klist_children_get
,
385 INIT_LIST_HEAD(&dev
->dma_pools
);
386 INIT_LIST_HEAD(&dev
->node
);
387 init_MUTEX(&dev
->sem
);
388 device_init_wakeup(dev
, 0);
389 set_dev_node(dev
, -1);
392 #ifdef CONFIG_SYSFS_DEPRECATED
393 static struct kobject
* get_device_parent(struct device
*dev
,
394 struct device
*parent
)
396 /* Set the parent to the class, not the parent device */
397 /* this keeps sysfs from having a symlink to make old udevs happy */
399 return &dev
->class->subsys
.kset
.kobj
;
401 return &parent
->kobj
;
406 static struct kobject
* virtual_device_parent(struct device
*dev
)
409 return ERR_PTR(-ENODEV
);
411 if (!dev
->class->virtual_dir
) {
412 static struct kobject
*virtual_dir
= NULL
;
415 virtual_dir
= kobject_add_dir(&devices_subsys
.kset
.kobj
, "virtual");
416 dev
->class->virtual_dir
= kobject_add_dir(virtual_dir
, dev
->class->name
);
419 return dev
->class->virtual_dir
;
422 static struct kobject
* get_device_parent(struct device
*dev
,
423 struct device
*parent
)
425 /* if this is a class device, and has no parent, create one */
426 if ((dev
->class) && (parent
== NULL
)) {
427 return virtual_device_parent(dev
);
429 return &parent
->kobj
;
434 static int setup_parent(struct device
*dev
, struct device
*parent
)
436 struct kobject
*kobj
;
437 kobj
= get_device_parent(dev
, parent
);
439 return PTR_ERR(kobj
);
441 dev
->kobj
.parent
= kobj
;
446 * device_add - add device to device hierarchy.
449 * This is part 2 of device_register(), though may be called
450 * separately _iff_ device_initialize() has been called separately.
452 * This adds it to the kobject hierarchy via kobject_add(), adds it
453 * to the global and sibling lists for the device, then
454 * adds it to the other relevant subsystems of the driver model.
456 int device_add(struct device
*dev
)
458 struct device
*parent
= NULL
;
459 char *class_name
= NULL
;
460 struct class_interface
*class_intf
;
463 dev
= get_device(dev
);
464 if (!dev
|| !strlen(dev
->bus_id
))
467 pr_debug("DEV: registering device: ID = '%s'\n", dev
->bus_id
);
469 parent
= get_device(dev
->parent
);
471 error
= setup_parent(dev
, parent
);
475 /* first, register with generic layer. */
476 kobject_set_name(&dev
->kobj
, "%s", dev
->bus_id
);
477 error
= kobject_add(&dev
->kobj
);
481 /* notify platform of device entry */
483 platform_notify(dev
);
485 /* notify clients of device entry (new way) */
487 blocking_notifier_call_chain(&dev
->bus
->bus_notifier
,
488 BUS_NOTIFY_ADD_DEVICE
, dev
);
490 dev
->uevent_attr
.attr
.name
= "uevent";
491 dev
->uevent_attr
.attr
.mode
= S_IWUSR
;
493 dev
->uevent_attr
.attr
.owner
= dev
->driver
->owner
;
494 dev
->uevent_attr
.store
= store_uevent
;
495 error
= device_create_file(dev
, &dev
->uevent_attr
);
499 if (MAJOR(dev
->devt
)) {
500 struct device_attribute
*attr
;
501 attr
= kzalloc(sizeof(*attr
), GFP_KERNEL
);
504 goto ueventattrError
;
506 attr
->attr
.name
= "dev";
507 attr
->attr
.mode
= S_IRUGO
;
509 attr
->attr
.owner
= dev
->driver
->owner
;
510 attr
->show
= show_dev
;
511 error
= device_create_file(dev
, attr
);
514 goto ueventattrError
;
517 dev
->devt_attr
= attr
;
521 sysfs_create_link(&dev
->kobj
, &dev
->class->subsys
.kset
.kobj
,
523 /* If this is not a "fake" compatible device, then create the
524 * symlink from the class to the device. */
525 if (dev
->kobj
.parent
!= &dev
->class->subsys
.kset
.kobj
)
526 sysfs_create_link(&dev
->class->subsys
.kset
.kobj
,
527 &dev
->kobj
, dev
->bus_id
);
528 #ifdef CONFIG_SYSFS_DEPRECATED
530 sysfs_create_link(&dev
->kobj
, &dev
->parent
->kobj
, "device");
531 class_name
= make_class_name(dev
->class->name
, &dev
->kobj
);
532 sysfs_create_link(&dev
->parent
->kobj
, &dev
->kobj
, class_name
);
537 if ((error
= device_add_attrs(dev
)))
539 if ((error
= device_add_groups(dev
)))
541 if ((error
= device_pm_add(dev
)))
543 if ((error
= bus_add_device(dev
)))
545 kobject_uevent(&dev
->kobj
, KOBJ_ADD
);
546 if ((error
= bus_attach_device(dev
)))
549 klist_add_tail(&dev
->knode_parent
, &parent
->klist_children
);
552 down(&dev
->class->sem
);
553 /* tie the class to the device */
554 list_add_tail(&dev
->node
, &dev
->class->devices
);
556 /* notify any interfaces that the device is here */
557 list_for_each_entry(class_intf
, &dev
->class->interfaces
, node
)
558 if (class_intf
->add_dev
)
559 class_intf
->add_dev(dev
, class_intf
);
560 up(&dev
->class->sem
);
567 bus_remove_device(dev
);
569 device_pm_remove(dev
);
572 blocking_notifier_call_chain(&dev
->bus
->bus_notifier
,
573 BUS_NOTIFY_DEL_DEVICE
, dev
);
574 device_remove_groups(dev
);
576 device_remove_attrs(dev
);
578 if (dev
->devt_attr
) {
579 device_remove_file(dev
, dev
->devt_attr
);
580 kfree(dev
->devt_attr
);
583 device_remove_file(dev
, &dev
->uevent_attr
);
585 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
586 kobject_del(&dev
->kobj
);
595 * device_register - register a device with the system.
596 * @dev: pointer to the device structure
598 * This happens in two clean steps - initialize the device
599 * and add it to the system. The two steps can be called
600 * separately, but this is the easiest and most common.
601 * I.e. you should only call the two helpers separately if
602 * have a clearly defined need to use and refcount the device
603 * before it is added to the hierarchy.
606 int device_register(struct device
*dev
)
608 device_initialize(dev
);
609 return device_add(dev
);
614 * get_device - increment reference count for device.
617 * This simply forwards the call to kobject_get(), though
618 * we do take care to provide for the case that we get a NULL
622 struct device
* get_device(struct device
* dev
)
624 return dev
? to_dev(kobject_get(&dev
->kobj
)) : NULL
;
629 * put_device - decrement reference count.
630 * @dev: device in question.
632 void put_device(struct device
* dev
)
635 kobject_put(&dev
->kobj
);
640 * device_del - delete device from system.
643 * This is the first part of the device unregistration
644 * sequence. This removes the device from the lists we control
645 * from here, has it removed from the other driver model
646 * subsystems it was added to in device_add(), and removes it
647 * from the kobject hierarchy.
649 * NOTE: this should be called manually _iff_ device_add() was
650 * also called manually.
653 void device_del(struct device
* dev
)
655 struct device
* parent
= dev
->parent
;
656 struct class_interface
*class_intf
;
659 klist_del(&dev
->knode_parent
);
660 if (dev
->devt_attr
) {
661 device_remove_file(dev
, dev
->devt_attr
);
662 kfree(dev
->devt_attr
);
665 sysfs_remove_link(&dev
->kobj
, "subsystem");
666 /* If this is not a "fake" compatible device, remove the
667 * symlink from the class to the device. */
668 if (dev
->kobj
.parent
!= &dev
->class->subsys
.kset
.kobj
)
669 sysfs_remove_link(&dev
->class->subsys
.kset
.kobj
,
671 #ifdef CONFIG_SYSFS_DEPRECATED
673 char *class_name
= make_class_name(dev
->class->name
,
675 sysfs_remove_link(&dev
->parent
->kobj
, class_name
);
677 sysfs_remove_link(&dev
->kobj
, "device");
681 down(&dev
->class->sem
);
682 /* notify any interfaces that the device is now gone */
683 list_for_each_entry(class_intf
, &dev
->class->interfaces
, node
)
684 if (class_intf
->remove_dev
)
685 class_intf
->remove_dev(dev
, class_intf
);
686 /* remove the device from the class list */
687 list_del_init(&dev
->node
);
688 up(&dev
->class->sem
);
690 device_remove_file(dev
, &dev
->uevent_attr
);
691 device_remove_groups(dev
);
692 device_remove_attrs(dev
);
693 bus_remove_device(dev
);
695 /* Notify the platform of the removal, in case they
696 * need to do anything...
698 if (platform_notify_remove
)
699 platform_notify_remove(dev
);
701 blocking_notifier_call_chain(&dev
->bus
->bus_notifier
,
702 BUS_NOTIFY_DEL_DEVICE
, dev
);
703 device_pm_remove(dev
);
704 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
705 kobject_del(&dev
->kobj
);
711 * device_unregister - unregister device from system.
712 * @dev: device going away.
714 * We do this in two parts, like we do device_register(). First,
715 * we remove it from all the subsystems with device_del(), then
716 * we decrement the reference count via put_device(). If that
717 * is the final reference count, the device will be cleaned up
718 * via device_release() above. Otherwise, the structure will
719 * stick around until the final reference to the device is dropped.
721 void device_unregister(struct device
* dev
)
723 pr_debug("DEV: Unregistering device. ID = '%s'\n", dev
->bus_id
);
729 static struct device
* next_device(struct klist_iter
* i
)
731 struct klist_node
* n
= klist_next(i
);
732 return n
? container_of(n
, struct device
, knode_parent
) : NULL
;
736 * device_for_each_child - device child iterator.
737 * @parent: parent struct device.
738 * @data: data for the callback.
739 * @fn: function to be called for each device.
741 * Iterate over @parent's child devices, and call @fn for each,
744 * We check the return of @fn each time. If it returns anything
745 * other than 0, we break out and return that value.
747 int device_for_each_child(struct device
* parent
, void * data
,
748 int (*fn
)(struct device
*, void *))
751 struct device
* child
;
754 klist_iter_init(&parent
->klist_children
, &i
);
755 while ((child
= next_device(&i
)) && !error
)
756 error
= fn(child
, data
);
762 * device_find_child - device iterator for locating a particular device.
763 * @parent: parent struct device
764 * @data: Data to pass to match function
765 * @match: Callback function to check device
767 * This is similar to the device_for_each_child() function above, but it
768 * returns a reference to a device that is 'found' for later use, as
769 * determined by the @match callback.
771 * The callback should return 0 if the device doesn't match and non-zero
772 * if it does. If the callback returns non-zero and a reference to the
773 * current device can be obtained, this function will return to the caller
774 * and not iterate over any more devices.
776 struct device
* device_find_child(struct device
*parent
, void *data
,
777 int (*match
)(struct device
*, void *))
780 struct device
*child
;
785 klist_iter_init(&parent
->klist_children
, &i
);
786 while ((child
= next_device(&i
)))
787 if (match(child
, data
) && get_device(child
))
793 int __init
devices_init(void)
795 return subsystem_register(&devices_subsys
);
798 EXPORT_SYMBOL_GPL(device_for_each_child
);
799 EXPORT_SYMBOL_GPL(device_find_child
);
801 EXPORT_SYMBOL_GPL(device_initialize
);
802 EXPORT_SYMBOL_GPL(device_add
);
803 EXPORT_SYMBOL_GPL(device_register
);
805 EXPORT_SYMBOL_GPL(device_del
);
806 EXPORT_SYMBOL_GPL(device_unregister
);
807 EXPORT_SYMBOL_GPL(get_device
);
808 EXPORT_SYMBOL_GPL(put_device
);
810 EXPORT_SYMBOL_GPL(device_create_file
);
811 EXPORT_SYMBOL_GPL(device_remove_file
);
814 static void device_create_release(struct device
*dev
)
816 pr_debug("%s called for %s\n", __FUNCTION__
, dev
->bus_id
);
821 * device_create - creates a device and registers it with sysfs
822 * @class: pointer to the struct class that this device should be registered to
823 * @parent: pointer to the parent struct device of this new device, if any
824 * @devt: the dev_t for the char device to be added
825 * @fmt: string for the device's name
827 * This function can be used by char device classes. A struct device
828 * will be created in sysfs, registered to the specified class.
830 * A "dev" file will be created, showing the dev_t for the device, if
831 * the dev_t is not 0,0.
832 * If a pointer to a parent struct device is passed in, the newly created
833 * struct device will be a child of that device in sysfs.
834 * The pointer to the struct device will be returned from the call.
835 * Any further sysfs files that might be required can be created using this
838 * Note: the struct class passed to this function must have previously
839 * been created with a call to class_create().
841 struct device
*device_create(struct class *class, struct device
*parent
,
842 dev_t devt
, const char *fmt
, ...)
845 struct device
*dev
= NULL
;
846 int retval
= -ENODEV
;
848 if (class == NULL
|| IS_ERR(class))
851 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
859 dev
->parent
= parent
;
860 dev
->release
= device_create_release
;
863 vsnprintf(dev
->bus_id
, BUS_ID_SIZE
, fmt
, args
);
865 retval
= device_register(dev
);
873 return ERR_PTR(retval
);
875 EXPORT_SYMBOL_GPL(device_create
);
878 * device_destroy - removes a device that was created with device_create()
879 * @class: pointer to the struct class that this device was registered with
880 * @devt: the dev_t of the device that was previously registered
882 * This call unregisters and cleans up a device that was created with a
883 * call to device_create().
885 void device_destroy(struct class *class, dev_t devt
)
887 struct device
*dev
= NULL
;
888 struct device
*dev_tmp
;
891 list_for_each_entry(dev_tmp
, &class->devices
, node
) {
892 if (dev_tmp
->devt
== devt
) {
900 device_unregister(dev
);
902 EXPORT_SYMBOL_GPL(device_destroy
);
905 * device_rename - renames a device
906 * @dev: the pointer to the struct device to be renamed
907 * @new_name: the new name of the device
909 int device_rename(struct device
*dev
, char *new_name
)
911 char *old_class_name
= NULL
;
912 char *new_class_name
= NULL
;
913 char *old_symlink_name
= NULL
;
916 dev
= get_device(dev
);
920 pr_debug("DEVICE: renaming '%s' to '%s'\n", dev
->bus_id
, new_name
);
922 #ifdef CONFIG_SYSFS_DEPRECATED
923 if ((dev
->class) && (dev
->parent
))
924 old_class_name
= make_class_name(dev
->class->name
, &dev
->kobj
);
928 old_symlink_name
= kmalloc(BUS_ID_SIZE
, GFP_KERNEL
);
929 if (!old_symlink_name
) {
931 goto out_free_old_class
;
933 strlcpy(old_symlink_name
, dev
->bus_id
, BUS_ID_SIZE
);
936 strlcpy(dev
->bus_id
, new_name
, BUS_ID_SIZE
);
938 error
= kobject_rename(&dev
->kobj
, new_name
);
940 #ifdef CONFIG_SYSFS_DEPRECATED
941 if (old_class_name
) {
942 new_class_name
= make_class_name(dev
->class->name
, &dev
->kobj
);
943 if (new_class_name
) {
944 sysfs_create_link(&dev
->parent
->kobj
, &dev
->kobj
,
946 sysfs_remove_link(&dev
->parent
->kobj
, old_class_name
);
952 sysfs_remove_link(&dev
->class->subsys
.kset
.kobj
,
954 sysfs_create_link(&dev
->class->subsys
.kset
.kobj
, &dev
->kobj
,
959 kfree(new_class_name
);
960 kfree(old_symlink_name
);
962 kfree(old_class_name
);
968 static int device_move_class_links(struct device
*dev
,
969 struct device
*old_parent
,
970 struct device
*new_parent
)
972 #ifdef CONFIG_SYSFS_DEPRECATED
976 class_name
= make_class_name(dev
->class->name
, &dev
->kobj
);
978 error
= PTR_ERR(class_name
);
983 sysfs_remove_link(&dev
->kobj
, "device");
984 sysfs_remove_link(&old_parent
->kobj
, class_name
);
987 error
= sysfs_create_link(&dev
->kobj
, &new_parent
->kobj
,
991 error
= sysfs_create_link(&new_parent
->kobj
, &dev
->kobj
,
994 sysfs_remove_link(&dev
->kobj
, "device");
1007 * device_move - moves a device to a new parent
1008 * @dev: the pointer to the struct device to be moved
1009 * @new_parent: the new parent of the device (can by NULL)
1011 int device_move(struct device
*dev
, struct device
*new_parent
)
1014 struct device
*old_parent
;
1015 struct kobject
*new_parent_kobj
;
1017 dev
= get_device(dev
);
1021 new_parent
= get_device(new_parent
);
1022 new_parent_kobj
= get_device_parent (dev
, new_parent
);
1023 if (IS_ERR(new_parent_kobj
)) {
1024 error
= PTR_ERR(new_parent_kobj
);
1025 put_device(new_parent
);
1028 pr_debug("DEVICE: moving '%s' to '%s'\n", dev
->bus_id
,
1029 new_parent
? new_parent
->bus_id
: "<NULL>");
1030 error
= kobject_move(&dev
->kobj
, new_parent_kobj
);
1032 put_device(new_parent
);
1035 old_parent
= dev
->parent
;
1036 dev
->parent
= new_parent
;
1038 klist_remove(&dev
->knode_parent
);
1040 klist_add_tail(&dev
->knode_parent
, &new_parent
->klist_children
);
1043 error
= device_move_class_links(dev
, old_parent
, new_parent
);
1045 /* We ignore errors on cleanup since we're hosed anyway... */
1046 device_move_class_links(dev
, new_parent
, old_parent
);
1047 if (!kobject_move(&dev
->kobj
, &old_parent
->kobj
)) {
1049 klist_remove(&dev
->knode_parent
);
1051 klist_add_tail(&dev
->knode_parent
,
1052 &old_parent
->klist_children
);
1054 put_device(new_parent
);
1058 put_device(old_parent
);
1064 EXPORT_SYMBOL_GPL(device_move
);