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 <linux/of_device.h>
23 #include <linux/genhd.h>
24 #include <linux/kallsyms.h>
25 #include <linux/mutex.h>
26 #include <linux/async.h>
27 #include <linux/pm_runtime.h>
28 #include <linux/netdevice.h>
31 #include "power/power.h"
33 #ifdef CONFIG_SYSFS_DEPRECATED
34 #ifdef CONFIG_SYSFS_DEPRECATED_V2
35 long sysfs_deprecated
= 1;
37 long sysfs_deprecated
= 0;
39 static __init
int sysfs_deprecated_setup(char *arg
)
41 return strict_strtol(arg
, 10, &sysfs_deprecated
);
43 early_param("sysfs.deprecated", sysfs_deprecated_setup
);
46 int (*platform_notify
)(struct device
*dev
) = NULL
;
47 int (*platform_notify_remove
)(struct device
*dev
) = NULL
;
48 static struct kobject
*dev_kobj
;
49 struct kobject
*sysfs_dev_char_kobj
;
50 struct kobject
*sysfs_dev_block_kobj
;
53 static inline int device_is_not_partition(struct device
*dev
)
55 return !(dev
->type
== &part_type
);
58 static inline int device_is_not_partition(struct device
*dev
)
65 * dev_driver_string - Return a device's driver name, if at all possible
66 * @dev: struct device to get the name of
68 * Will return the device's driver's name if it is bound to a device. If
69 * the device is not bound to a driver, it will return the name of the bus
70 * it is attached to. If it is not attached to a bus either, an empty
71 * string will be returned.
73 const char *dev_driver_string(const struct device
*dev
)
75 struct device_driver
*drv
;
77 /* dev->driver can change to NULL underneath us because of unbinding,
78 * so be careful about accessing it. dev->bus and dev->class should
79 * never change once they are set, so they don't need special care.
81 drv
= ACCESS_ONCE(dev
->driver
);
82 return drv
? drv
->name
:
83 (dev
->bus
? dev
->bus
->name
:
84 (dev
->class ? dev
->class->name
: ""));
86 EXPORT_SYMBOL(dev_driver_string
);
88 #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
90 static ssize_t
dev_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
93 struct device_attribute
*dev_attr
= to_dev_attr(attr
);
94 struct device
*dev
= kobj_to_dev(kobj
);
98 ret
= dev_attr
->show(dev
, dev_attr
, buf
);
99 if (ret
>= (ssize_t
)PAGE_SIZE
) {
100 print_symbol("dev_attr_show: %s returned bad count\n",
101 (unsigned long)dev_attr
->show
);
106 static ssize_t
dev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
107 const char *buf
, size_t count
)
109 struct device_attribute
*dev_attr
= to_dev_attr(attr
);
110 struct device
*dev
= kobj_to_dev(kobj
);
114 ret
= dev_attr
->store(dev
, dev_attr
, buf
, count
);
118 static const struct sysfs_ops dev_sysfs_ops
= {
119 .show
= dev_attr_show
,
120 .store
= dev_attr_store
,
123 #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr)
125 ssize_t
device_store_ulong(struct device
*dev
,
126 struct device_attribute
*attr
,
127 const char *buf
, size_t size
)
129 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
131 unsigned long new = simple_strtoul(buf
, &end
, 0);
134 *(unsigned long *)(ea
->var
) = new;
135 /* Always return full write size even if we didn't consume all */
138 EXPORT_SYMBOL_GPL(device_store_ulong
);
140 ssize_t
device_show_ulong(struct device
*dev
,
141 struct device_attribute
*attr
,
144 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
145 return snprintf(buf
, PAGE_SIZE
, "%lx\n", *(unsigned long *)(ea
->var
));
147 EXPORT_SYMBOL_GPL(device_show_ulong
);
149 ssize_t
device_store_int(struct device
*dev
,
150 struct device_attribute
*attr
,
151 const char *buf
, size_t size
)
153 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
155 long new = simple_strtol(buf
, &end
, 0);
156 if (end
== buf
|| new > INT_MAX
|| new < INT_MIN
)
158 *(int *)(ea
->var
) = new;
159 /* Always return full write size even if we didn't consume all */
162 EXPORT_SYMBOL_GPL(device_store_int
);
164 ssize_t
device_show_int(struct device
*dev
,
165 struct device_attribute
*attr
,
168 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
170 return snprintf(buf
, PAGE_SIZE
, "%d\n", *(int *)(ea
->var
));
172 EXPORT_SYMBOL_GPL(device_show_int
);
174 ssize_t
device_store_bool(struct device
*dev
, struct device_attribute
*attr
,
175 const char *buf
, size_t size
)
177 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
179 if (strtobool(buf
, ea
->var
) < 0)
184 EXPORT_SYMBOL_GPL(device_store_bool
);
186 ssize_t
device_show_bool(struct device
*dev
, struct device_attribute
*attr
,
189 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
191 return snprintf(buf
, PAGE_SIZE
, "%d\n", *(bool *)(ea
->var
));
193 EXPORT_SYMBOL_GPL(device_show_bool
);
196 * device_release - free device structure.
197 * @kobj: device's kobject.
199 * This is called once the reference count for the object
200 * reaches 0. We forward the call to the device's release
201 * method, which should handle actually freeing the structure.
203 static void device_release(struct kobject
*kobj
)
205 struct device
*dev
= kobj_to_dev(kobj
);
206 struct device_private
*p
= dev
->p
;
209 * Some platform devices are driven without driver attached
210 * and managed resources may have been acquired. Make sure
211 * all resources are released.
213 * Drivers still can add resources into device after device
214 * is deleted but alive, so release devres here to avoid
215 * possible memory leak.
217 devres_release_all(dev
);
221 else if (dev
->type
&& dev
->type
->release
)
222 dev
->type
->release(dev
);
223 else if (dev
->class && dev
->class->dev_release
)
224 dev
->class->dev_release(dev
);
226 WARN(1, KERN_ERR
"Device '%s' does not have a release() "
227 "function, it is broken and must be fixed.\n",
232 static const void *device_namespace(struct kobject
*kobj
)
234 struct device
*dev
= kobj_to_dev(kobj
);
235 const void *ns
= NULL
;
237 if (dev
->class && dev
->class->ns_type
)
238 ns
= dev
->class->namespace(dev
);
243 static struct kobj_type device_ktype
= {
244 .release
= device_release
,
245 .sysfs_ops
= &dev_sysfs_ops
,
246 .namespace = device_namespace
,
250 static int dev_uevent_filter(struct kset
*kset
, struct kobject
*kobj
)
252 struct kobj_type
*ktype
= get_ktype(kobj
);
254 if (ktype
== &device_ktype
) {
255 struct device
*dev
= kobj_to_dev(kobj
);
264 static const char *dev_uevent_name(struct kset
*kset
, struct kobject
*kobj
)
266 struct device
*dev
= kobj_to_dev(kobj
);
269 return dev
->bus
->name
;
271 return dev
->class->name
;
275 static int dev_uevent(struct kset
*kset
, struct kobject
*kobj
,
276 struct kobj_uevent_env
*env
)
278 struct device
*dev
= kobj_to_dev(kobj
);
281 /* add device node properties if present */
282 if (MAJOR(dev
->devt
)) {
286 kuid_t uid
= GLOBAL_ROOT_UID
;
287 kgid_t gid
= GLOBAL_ROOT_GID
;
289 add_uevent_var(env
, "MAJOR=%u", MAJOR(dev
->devt
));
290 add_uevent_var(env
, "MINOR=%u", MINOR(dev
->devt
));
291 name
= device_get_devnode(dev
, &mode
, &uid
, &gid
, &tmp
);
293 add_uevent_var(env
, "DEVNAME=%s", name
);
295 add_uevent_var(env
, "DEVMODE=%#o", mode
& 0777);
296 if (!uid_eq(uid
, GLOBAL_ROOT_UID
))
297 add_uevent_var(env
, "DEVUID=%u", from_kuid(&init_user_ns
, uid
));
298 if (!gid_eq(gid
, GLOBAL_ROOT_GID
))
299 add_uevent_var(env
, "DEVGID=%u", from_kgid(&init_user_ns
, gid
));
304 if (dev
->type
&& dev
->type
->name
)
305 add_uevent_var(env
, "DEVTYPE=%s", dev
->type
->name
);
308 add_uevent_var(env
, "DRIVER=%s", dev
->driver
->name
);
310 /* Add common DT information about the device */
311 of_device_uevent(dev
, env
);
313 /* have the bus specific function add its stuff */
314 if (dev
->bus
&& dev
->bus
->uevent
) {
315 retval
= dev
->bus
->uevent(dev
, env
);
317 pr_debug("device: '%s': %s: bus uevent() returned %d\n",
318 dev_name(dev
), __func__
, retval
);
321 /* have the class specific function add its stuff */
322 if (dev
->class && dev
->class->dev_uevent
) {
323 retval
= dev
->class->dev_uevent(dev
, env
);
325 pr_debug("device: '%s': %s: class uevent() "
326 "returned %d\n", dev_name(dev
),
330 /* have the device type specific function add its stuff */
331 if (dev
->type
&& dev
->type
->uevent
) {
332 retval
= dev
->type
->uevent(dev
, env
);
334 pr_debug("device: '%s': %s: dev_type uevent() "
335 "returned %d\n", dev_name(dev
),
342 static const struct kset_uevent_ops device_uevent_ops
= {
343 .filter
= dev_uevent_filter
,
344 .name
= dev_uevent_name
,
345 .uevent
= dev_uevent
,
348 static ssize_t
show_uevent(struct device
*dev
, struct device_attribute
*attr
,
351 struct kobject
*top_kobj
;
353 struct kobj_uevent_env
*env
= NULL
;
358 /* search the kset, the device belongs to */
359 top_kobj
= &dev
->kobj
;
360 while (!top_kobj
->kset
&& top_kobj
->parent
)
361 top_kobj
= top_kobj
->parent
;
365 kset
= top_kobj
->kset
;
366 if (!kset
->uevent_ops
|| !kset
->uevent_ops
->uevent
)
370 if (kset
->uevent_ops
&& kset
->uevent_ops
->filter
)
371 if (!kset
->uevent_ops
->filter(kset
, &dev
->kobj
))
374 env
= kzalloc(sizeof(struct kobj_uevent_env
), GFP_KERNEL
);
378 /* let the kset specific function add its keys */
379 retval
= kset
->uevent_ops
->uevent(kset
, &dev
->kobj
, env
);
383 /* copy keys to file */
384 for (i
= 0; i
< env
->envp_idx
; i
++)
385 count
+= sprintf(&buf
[count
], "%s\n", env
->envp
[i
]);
391 static ssize_t
store_uevent(struct device
*dev
, struct device_attribute
*attr
,
392 const char *buf
, size_t count
)
394 enum kobject_action action
;
396 if (kobject_action_type(buf
, count
, &action
) == 0)
397 kobject_uevent(&dev
->kobj
, action
);
399 dev_err(dev
, "uevent: unknown action-string\n");
403 static struct device_attribute uevent_attr
=
404 __ATTR(uevent
, S_IRUGO
| S_IWUSR
, show_uevent
, store_uevent
);
406 static int device_add_attributes(struct device
*dev
,
407 struct device_attribute
*attrs
)
413 for (i
= 0; attr_name(attrs
[i
]); i
++) {
414 error
= device_create_file(dev
, &attrs
[i
]);
420 device_remove_file(dev
, &attrs
[i
]);
425 static void device_remove_attributes(struct device
*dev
,
426 struct device_attribute
*attrs
)
431 for (i
= 0; attr_name(attrs
[i
]); i
++)
432 device_remove_file(dev
, &attrs
[i
]);
435 static int device_add_bin_attributes(struct device
*dev
,
436 struct bin_attribute
*attrs
)
442 for (i
= 0; attr_name(attrs
[i
]); i
++) {
443 error
= device_create_bin_file(dev
, &attrs
[i
]);
449 device_remove_bin_file(dev
, &attrs
[i
]);
454 static void device_remove_bin_attributes(struct device
*dev
,
455 struct bin_attribute
*attrs
)
460 for (i
= 0; attr_name(attrs
[i
]); i
++)
461 device_remove_bin_file(dev
, &attrs
[i
]);
464 static int device_add_groups(struct device
*dev
,
465 const struct attribute_group
**groups
)
471 for (i
= 0; groups
[i
]; i
++) {
472 error
= sysfs_create_group(&dev
->kobj
, groups
[i
]);
475 sysfs_remove_group(&dev
->kobj
,
484 static void device_remove_groups(struct device
*dev
,
485 const struct attribute_group
**groups
)
490 for (i
= 0; groups
[i
]; i
++)
491 sysfs_remove_group(&dev
->kobj
, groups
[i
]);
494 static int device_add_attrs(struct device
*dev
)
496 struct class *class = dev
->class;
497 const struct device_type
*type
= dev
->type
;
501 error
= device_add_attributes(dev
, class->dev_attrs
);
504 error
= device_add_bin_attributes(dev
, class->dev_bin_attrs
);
506 goto err_remove_class_attrs
;
510 error
= device_add_groups(dev
, type
->groups
);
512 goto err_remove_class_bin_attrs
;
515 error
= device_add_groups(dev
, dev
->groups
);
517 goto err_remove_type_groups
;
521 err_remove_type_groups
:
523 device_remove_groups(dev
, type
->groups
);
524 err_remove_class_bin_attrs
:
526 device_remove_bin_attributes(dev
, class->dev_bin_attrs
);
527 err_remove_class_attrs
:
529 device_remove_attributes(dev
, class->dev_attrs
);
534 static void device_remove_attrs(struct device
*dev
)
536 struct class *class = dev
->class;
537 const struct device_type
*type
= dev
->type
;
539 device_remove_groups(dev
, dev
->groups
);
542 device_remove_groups(dev
, type
->groups
);
545 device_remove_attributes(dev
, class->dev_attrs
);
546 device_remove_bin_attributes(dev
, class->dev_bin_attrs
);
551 static ssize_t
show_dev(struct device
*dev
, struct device_attribute
*attr
,
554 return print_dev_t(buf
, dev
->devt
);
557 static struct device_attribute devt_attr
=
558 __ATTR(dev
, S_IRUGO
, show_dev
, NULL
);
561 struct kset
*devices_kset
;
564 * device_create_file - create sysfs attribute file for device.
566 * @attr: device attribute descriptor.
568 int device_create_file(struct device
*dev
,
569 const struct device_attribute
*attr
)
574 WARN(((attr
->attr
.mode
& S_IWUGO
) && !attr
->store
),
575 "Attribute %s: write permission without 'store'\n",
577 WARN(((attr
->attr
.mode
& S_IRUGO
) && !attr
->show
),
578 "Attribute %s: read permission without 'show'\n",
580 error
= sysfs_create_file(&dev
->kobj
, &attr
->attr
);
587 * device_remove_file - remove sysfs attribute file.
589 * @attr: device attribute descriptor.
591 void device_remove_file(struct device
*dev
,
592 const struct device_attribute
*attr
)
595 sysfs_remove_file(&dev
->kobj
, &attr
->attr
);
599 * device_create_bin_file - create sysfs binary attribute file for device.
601 * @attr: device binary attribute descriptor.
603 int device_create_bin_file(struct device
*dev
,
604 const struct bin_attribute
*attr
)
608 error
= sysfs_create_bin_file(&dev
->kobj
, attr
);
611 EXPORT_SYMBOL_GPL(device_create_bin_file
);
614 * device_remove_bin_file - remove sysfs binary attribute file
616 * @attr: device binary attribute descriptor.
618 void device_remove_bin_file(struct device
*dev
,
619 const struct bin_attribute
*attr
)
622 sysfs_remove_bin_file(&dev
->kobj
, attr
);
624 EXPORT_SYMBOL_GPL(device_remove_bin_file
);
627 * device_schedule_callback_owner - helper to schedule a callback for a device
629 * @func: callback function to invoke later.
630 * @owner: module owning the callback routine
632 * Attribute methods must not unregister themselves or their parent device
633 * (which would amount to the same thing). Attempts to do so will deadlock,
634 * since unregistration is mutually exclusive with driver callbacks.
636 * Instead methods can call this routine, which will attempt to allocate
637 * and schedule a workqueue request to call back @func with @dev as its
638 * argument in the workqueue's process context. @dev will be pinned until
641 * This routine is usually called via the inline device_schedule_callback(),
642 * which automatically sets @owner to THIS_MODULE.
644 * Returns 0 if the request was submitted, -ENOMEM if storage could not
645 * be allocated, -ENODEV if a reference to @owner isn't available.
647 * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
648 * underlying sysfs routine (since it is intended for use by attribute
649 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
651 int device_schedule_callback_owner(struct device
*dev
,
652 void (*func
)(struct device
*), struct module
*owner
)
654 return sysfs_schedule_callback(&dev
->kobj
,
655 (void (*)(void *)) func
, dev
, owner
);
657 EXPORT_SYMBOL_GPL(device_schedule_callback_owner
);
659 static void klist_children_get(struct klist_node
*n
)
661 struct device_private
*p
= to_device_private_parent(n
);
662 struct device
*dev
= p
->device
;
667 static void klist_children_put(struct klist_node
*n
)
669 struct device_private
*p
= to_device_private_parent(n
);
670 struct device
*dev
= p
->device
;
676 * device_initialize - init device structure.
679 * This prepares the device for use by other layers by initializing
681 * It is the first half of device_register(), if called by
682 * that function, though it can also be called separately, so one
683 * may use @dev's fields. In particular, get_device()/put_device()
684 * may be used for reference counting of @dev after calling this
687 * All fields in @dev must be initialized by the caller to 0, except
688 * for those explicitly set to some other value. The simplest
689 * approach is to use kzalloc() to allocate the structure containing
692 * NOTE: Use put_device() to give up your reference instead of freeing
693 * @dev directly once you have called this function.
695 void device_initialize(struct device
*dev
)
697 dev
->kobj
.kset
= devices_kset
;
698 kobject_init(&dev
->kobj
, &device_ktype
);
699 INIT_LIST_HEAD(&dev
->dma_pools
);
700 mutex_init(&dev
->mutex
);
701 lockdep_set_novalidate_class(&dev
->mutex
);
702 spin_lock_init(&dev
->devres_lock
);
703 INIT_LIST_HEAD(&dev
->devres_head
);
705 set_dev_node(dev
, -1);
708 struct kobject
*virtual_device_parent(struct device
*dev
)
710 static struct kobject
*virtual_dir
= NULL
;
713 virtual_dir
= kobject_create_and_add("virtual",
714 &devices_kset
->kobj
);
724 #define to_class_dir(obj) container_of(obj, struct class_dir, kobj)
726 static void class_dir_release(struct kobject
*kobj
)
728 struct class_dir
*dir
= to_class_dir(kobj
);
733 struct kobj_ns_type_operations
*class_dir_child_ns_type(struct kobject
*kobj
)
735 struct class_dir
*dir
= to_class_dir(kobj
);
736 return dir
->class->ns_type
;
739 static struct kobj_type class_dir_ktype
= {
740 .release
= class_dir_release
,
741 .sysfs_ops
= &kobj_sysfs_ops
,
742 .child_ns_type
= class_dir_child_ns_type
745 static struct kobject
*
746 class_dir_create_and_add(struct class *class, struct kobject
*parent_kobj
)
748 struct class_dir
*dir
;
751 dir
= kzalloc(sizeof(*dir
), GFP_KERNEL
);
756 kobject_init(&dir
->kobj
, &class_dir_ktype
);
758 dir
->kobj
.kset
= &class->p
->glue_dirs
;
760 retval
= kobject_add(&dir
->kobj
, parent_kobj
, "%s", class->name
);
762 kobject_put(&dir
->kobj
);
769 static struct kobject
*get_device_parent(struct device
*dev
,
770 struct device
*parent
)
773 static DEFINE_MUTEX(gdp_mutex
);
774 struct kobject
*kobj
= NULL
;
775 struct kobject
*parent_kobj
;
779 /* block disks show up in /sys/block */
780 if (sysfs_deprecated
&& dev
->class == &block_class
) {
781 if (parent
&& parent
->class == &block_class
)
782 return &parent
->kobj
;
783 return &block_class
.p
->subsys
.kobj
;
788 * If we have no parent, we live in "virtual".
789 * Class-devices with a non class-device as parent, live
790 * in a "glue" directory to prevent namespace collisions.
793 parent_kobj
= virtual_device_parent(dev
);
794 else if (parent
->class && !dev
->class->ns_type
)
795 return &parent
->kobj
;
797 parent_kobj
= &parent
->kobj
;
799 mutex_lock(&gdp_mutex
);
801 /* find our class-directory at the parent and reference it */
802 spin_lock(&dev
->class->p
->glue_dirs
.list_lock
);
803 list_for_each_entry(k
, &dev
->class->p
->glue_dirs
.list
, entry
)
804 if (k
->parent
== parent_kobj
) {
805 kobj
= kobject_get(k
);
808 spin_unlock(&dev
->class->p
->glue_dirs
.list_lock
);
810 mutex_unlock(&gdp_mutex
);
814 /* or create a new class-directory at the parent device */
815 k
= class_dir_create_and_add(dev
->class, parent_kobj
);
816 /* do not emit an uevent for this simple "glue" directory */
817 mutex_unlock(&gdp_mutex
);
821 /* subsystems can specify a default root directory for their devices */
822 if (!parent
&& dev
->bus
&& dev
->bus
->dev_root
)
823 return &dev
->bus
->dev_root
->kobj
;
826 return &parent
->kobj
;
830 static void cleanup_glue_dir(struct device
*dev
, struct kobject
*glue_dir
)
832 /* see if we live in a "glue" directory */
833 if (!glue_dir
|| !dev
->class ||
834 glue_dir
->kset
!= &dev
->class->p
->glue_dirs
)
837 kobject_put(glue_dir
);
840 static void cleanup_device_parent(struct device
*dev
)
842 cleanup_glue_dir(dev
, dev
->kobj
.parent
);
845 static int device_add_class_symlinks(struct device
*dev
)
852 error
= sysfs_create_link(&dev
->kobj
,
853 &dev
->class->p
->subsys
.kobj
,
858 if (dev
->parent
&& device_is_not_partition(dev
)) {
859 error
= sysfs_create_link(&dev
->kobj
, &dev
->parent
->kobj
,
866 /* /sys/block has directories and does not need symlinks */
867 if (sysfs_deprecated
&& dev
->class == &block_class
)
871 /* link in the class directory pointing to the device */
872 error
= sysfs_create_link(&dev
->class->p
->subsys
.kobj
,
873 &dev
->kobj
, dev_name(dev
));
880 sysfs_remove_link(&dev
->kobj
, "device");
883 sysfs_remove_link(&dev
->kobj
, "subsystem");
888 static void device_remove_class_symlinks(struct device
*dev
)
893 if (dev
->parent
&& device_is_not_partition(dev
))
894 sysfs_remove_link(&dev
->kobj
, "device");
895 sysfs_remove_link(&dev
->kobj
, "subsystem");
897 if (sysfs_deprecated
&& dev
->class == &block_class
)
900 sysfs_delete_link(&dev
->class->p
->subsys
.kobj
, &dev
->kobj
, dev_name(dev
));
904 * dev_set_name - set a device name
906 * @fmt: format string for the device's name
908 int dev_set_name(struct device
*dev
, const char *fmt
, ...)
913 va_start(vargs
, fmt
);
914 err
= kobject_set_name_vargs(&dev
->kobj
, fmt
, vargs
);
918 EXPORT_SYMBOL_GPL(dev_set_name
);
921 * device_to_dev_kobj - select a /sys/dev/ directory for the device
924 * By default we select char/ for new entries. Setting class->dev_obj
925 * to NULL prevents an entry from being created. class->dev_kobj must
926 * be set (or cleared) before any devices are registered to the class
927 * otherwise device_create_sys_dev_entry() and
928 * device_remove_sys_dev_entry() will disagree about the presence of
931 static struct kobject
*device_to_dev_kobj(struct device
*dev
)
933 struct kobject
*kobj
;
936 kobj
= dev
->class->dev_kobj
;
938 kobj
= sysfs_dev_char_kobj
;
943 static int device_create_sys_dev_entry(struct device
*dev
)
945 struct kobject
*kobj
= device_to_dev_kobj(dev
);
950 format_dev_t(devt_str
, dev
->devt
);
951 error
= sysfs_create_link(kobj
, &dev
->kobj
, devt_str
);
957 static void device_remove_sys_dev_entry(struct device
*dev
)
959 struct kobject
*kobj
= device_to_dev_kobj(dev
);
963 format_dev_t(devt_str
, dev
->devt
);
964 sysfs_remove_link(kobj
, devt_str
);
968 int device_private_init(struct device
*dev
)
970 dev
->p
= kzalloc(sizeof(*dev
->p
), GFP_KERNEL
);
973 dev
->p
->device
= dev
;
974 klist_init(&dev
->p
->klist_children
, klist_children_get
,
976 INIT_LIST_HEAD(&dev
->p
->deferred_probe
);
981 * device_add - add device to device hierarchy.
984 * This is part 2 of device_register(), though may be called
985 * separately _iff_ device_initialize() has been called separately.
987 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
988 * to the global and sibling lists for the device, then
989 * adds it to the other relevant subsystems of the driver model.
991 * Do not call this routine or device_register() more than once for
992 * any device structure. The driver model core is not designed to work
993 * with devices that get unregistered and then spring back to life.
994 * (Among other things, it's very hard to guarantee that all references
995 * to the previous incarnation of @dev have been dropped.) Allocate
996 * and register a fresh new struct device instead.
998 * NOTE: _Never_ directly free @dev after calling this function, even
999 * if it returned an error! Always use put_device() to give up your
1000 * reference instead.
1002 int device_add(struct device
*dev
)
1004 struct device
*parent
= NULL
;
1005 struct kobject
*kobj
;
1006 struct class_interface
*class_intf
;
1007 int error
= -EINVAL
;
1009 dev
= get_device(dev
);
1014 error
= device_private_init(dev
);
1020 * for statically allocated devices, which should all be converted
1021 * some day, we need to initialize the name. We prevent reading back
1022 * the name, and force the use of dev_name()
1024 if (dev
->init_name
) {
1025 dev_set_name(dev
, "%s", dev
->init_name
);
1026 dev
->init_name
= NULL
;
1029 /* subsystems can specify simple device enumeration */
1030 if (!dev_name(dev
) && dev
->bus
&& dev
->bus
->dev_name
)
1031 dev_set_name(dev
, "%s%u", dev
->bus
->dev_name
, dev
->id
);
1033 if (!dev_name(dev
)) {
1038 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1040 parent
= get_device(dev
->parent
);
1041 kobj
= get_device_parent(dev
, parent
);
1043 dev
->kobj
.parent
= kobj
;
1045 /* use parent numa_node */
1047 set_dev_node(dev
, dev_to_node(parent
));
1049 /* first, register with generic layer. */
1050 /* we require the name to be set before, and pass NULL */
1051 error
= kobject_add(&dev
->kobj
, dev
->kobj
.parent
, NULL
);
1055 /* notify platform of device entry */
1056 if (platform_notify
)
1057 platform_notify(dev
);
1059 error
= device_create_file(dev
, &uevent_attr
);
1063 if (MAJOR(dev
->devt
)) {
1064 error
= device_create_file(dev
, &devt_attr
);
1066 goto ueventattrError
;
1068 error
= device_create_sys_dev_entry(dev
);
1072 devtmpfs_create_node(dev
);
1075 error
= device_add_class_symlinks(dev
);
1078 error
= device_add_attrs(dev
);
1081 error
= bus_add_device(dev
);
1084 error
= dpm_sysfs_add(dev
);
1089 /* Notify clients of device addition. This call must come
1090 * after dpm_sysfs_add() and before kobject_uevent().
1093 blocking_notifier_call_chain(&dev
->bus
->p
->bus_notifier
,
1094 BUS_NOTIFY_ADD_DEVICE
, dev
);
1096 kobject_uevent(&dev
->kobj
, KOBJ_ADD
);
1097 bus_probe_device(dev
);
1099 klist_add_tail(&dev
->p
->knode_parent
,
1100 &parent
->p
->klist_children
);
1103 mutex_lock(&dev
->class->p
->mutex
);
1104 /* tie the class to the device */
1105 klist_add_tail(&dev
->knode_class
,
1106 &dev
->class->p
->klist_devices
);
1108 /* notify any interfaces that the device is here */
1109 list_for_each_entry(class_intf
,
1110 &dev
->class->p
->interfaces
, node
)
1111 if (class_intf
->add_dev
)
1112 class_intf
->add_dev(dev
, class_intf
);
1113 mutex_unlock(&dev
->class->p
->mutex
);
1119 bus_remove_device(dev
);
1121 device_remove_attrs(dev
);
1123 device_remove_class_symlinks(dev
);
1125 if (MAJOR(dev
->devt
))
1126 devtmpfs_delete_node(dev
);
1127 if (MAJOR(dev
->devt
))
1128 device_remove_sys_dev_entry(dev
);
1130 if (MAJOR(dev
->devt
))
1131 device_remove_file(dev
, &devt_attr
);
1133 device_remove_file(dev
, &uevent_attr
);
1135 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
1136 kobject_del(&dev
->kobj
);
1138 cleanup_device_parent(dev
);
1148 * device_register - register a device with the system.
1149 * @dev: pointer to the device structure
1151 * This happens in two clean steps - initialize the device
1152 * and add it to the system. The two steps can be called
1153 * separately, but this is the easiest and most common.
1154 * I.e. you should only call the two helpers separately if
1155 * have a clearly defined need to use and refcount the device
1156 * before it is added to the hierarchy.
1158 * For more information, see the kerneldoc for device_initialize()
1161 * NOTE: _Never_ directly free @dev after calling this function, even
1162 * if it returned an error! Always use put_device() to give up the
1163 * reference initialized in this function instead.
1165 int device_register(struct device
*dev
)
1167 device_initialize(dev
);
1168 return device_add(dev
);
1172 * get_device - increment reference count for device.
1175 * This simply forwards the call to kobject_get(), though
1176 * we do take care to provide for the case that we get a NULL
1177 * pointer passed in.
1179 struct device
*get_device(struct device
*dev
)
1181 return dev
? kobj_to_dev(kobject_get(&dev
->kobj
)) : NULL
;
1185 * put_device - decrement reference count.
1186 * @dev: device in question.
1188 void put_device(struct device
*dev
)
1190 /* might_sleep(); */
1192 kobject_put(&dev
->kobj
);
1196 * device_del - delete device from system.
1199 * This is the first part of the device unregistration
1200 * sequence. This removes the device from the lists we control
1201 * from here, has it removed from the other driver model
1202 * subsystems it was added to in device_add(), and removes it
1203 * from the kobject hierarchy.
1205 * NOTE: this should be called manually _iff_ device_add() was
1206 * also called manually.
1208 void device_del(struct device
*dev
)
1210 struct device
*parent
= dev
->parent
;
1211 struct class_interface
*class_intf
;
1213 /* Notify clients of device removal. This call must come
1214 * before dpm_sysfs_remove().
1217 blocking_notifier_call_chain(&dev
->bus
->p
->bus_notifier
,
1218 BUS_NOTIFY_DEL_DEVICE
, dev
);
1219 dpm_sysfs_remove(dev
);
1221 klist_del(&dev
->p
->knode_parent
);
1222 if (MAJOR(dev
->devt
)) {
1223 devtmpfs_delete_node(dev
);
1224 device_remove_sys_dev_entry(dev
);
1225 device_remove_file(dev
, &devt_attr
);
1228 device_remove_class_symlinks(dev
);
1230 mutex_lock(&dev
->class->p
->mutex
);
1231 /* notify any interfaces that the device is now gone */
1232 list_for_each_entry(class_intf
,
1233 &dev
->class->p
->interfaces
, node
)
1234 if (class_intf
->remove_dev
)
1235 class_intf
->remove_dev(dev
, class_intf
);
1236 /* remove the device from the class list */
1237 klist_del(&dev
->knode_class
);
1238 mutex_unlock(&dev
->class->p
->mutex
);
1240 device_remove_file(dev
, &uevent_attr
);
1241 device_remove_attrs(dev
);
1242 bus_remove_device(dev
);
1243 device_pm_remove(dev
);
1244 driver_deferred_probe_del(dev
);
1246 /* Notify the platform of the removal, in case they
1247 * need to do anything...
1249 if (platform_notify_remove
)
1250 platform_notify_remove(dev
);
1251 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
1252 cleanup_device_parent(dev
);
1253 kobject_del(&dev
->kobj
);
1258 * device_unregister - unregister device from system.
1259 * @dev: device going away.
1261 * We do this in two parts, like we do device_register(). First,
1262 * we remove it from all the subsystems with device_del(), then
1263 * we decrement the reference count via put_device(). If that
1264 * is the final reference count, the device will be cleaned up
1265 * via device_release() above. Otherwise, the structure will
1266 * stick around until the final reference to the device is dropped.
1268 void device_unregister(struct device
*dev
)
1270 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1275 static struct device
*next_device(struct klist_iter
*i
)
1277 struct klist_node
*n
= klist_next(i
);
1278 struct device
*dev
= NULL
;
1279 struct device_private
*p
;
1282 p
= to_device_private_parent(n
);
1289 * device_get_devnode - path of device node file
1291 * @mode: returned file access mode
1292 * @uid: returned file owner
1293 * @gid: returned file group
1294 * @tmp: possibly allocated string
1296 * Return the relative path of a possible device node.
1297 * Non-default names may need to allocate a memory to compose
1298 * a name. This memory is returned in tmp and needs to be
1299 * freed by the caller.
1301 const char *device_get_devnode(struct device
*dev
,
1302 umode_t
*mode
, kuid_t
*uid
, kgid_t
*gid
,
1309 /* the device type may provide a specific name */
1310 if (dev
->type
&& dev
->type
->devnode
)
1311 *tmp
= dev
->type
->devnode(dev
, mode
, uid
, gid
);
1315 /* the class may provide a specific name */
1316 if (dev
->class && dev
->class->devnode
)
1317 *tmp
= dev
->class->devnode(dev
, mode
);
1321 /* return name without allocation, tmp == NULL */
1322 if (strchr(dev_name(dev
), '!') == NULL
)
1323 return dev_name(dev
);
1325 /* replace '!' in the name with '/' */
1326 *tmp
= kstrdup(dev_name(dev
), GFP_KERNEL
);
1329 while ((s
= strchr(*tmp
, '!')))
1335 * device_for_each_child - device child iterator.
1336 * @parent: parent struct device.
1337 * @data: data for the callback.
1338 * @fn: function to be called for each device.
1340 * Iterate over @parent's child devices, and call @fn for each,
1343 * We check the return of @fn each time. If it returns anything
1344 * other than 0, we break out and return that value.
1346 int device_for_each_child(struct device
*parent
, void *data
,
1347 int (*fn
)(struct device
*dev
, void *data
))
1349 struct klist_iter i
;
1350 struct device
*child
;
1356 klist_iter_init(&parent
->p
->klist_children
, &i
);
1357 while ((child
= next_device(&i
)) && !error
)
1358 error
= fn(child
, data
);
1359 klist_iter_exit(&i
);
1364 * device_find_child - device iterator for locating a particular device.
1365 * @parent: parent struct device
1366 * @data: Data to pass to match function
1367 * @match: Callback function to check device
1369 * This is similar to the device_for_each_child() function above, but it
1370 * returns a reference to a device that is 'found' for later use, as
1371 * determined by the @match callback.
1373 * The callback should return 0 if the device doesn't match and non-zero
1374 * if it does. If the callback returns non-zero and a reference to the
1375 * current device can be obtained, this function will return to the caller
1376 * and not iterate over any more devices.
1378 struct device
*device_find_child(struct device
*parent
, void *data
,
1379 int (*match
)(struct device
*dev
, void *data
))
1381 struct klist_iter i
;
1382 struct device
*child
;
1387 klist_iter_init(&parent
->p
->klist_children
, &i
);
1388 while ((child
= next_device(&i
)))
1389 if (match(child
, data
) && get_device(child
))
1391 klist_iter_exit(&i
);
1395 int __init
devices_init(void)
1397 devices_kset
= kset_create_and_add("devices", &device_uevent_ops
, NULL
);
1400 dev_kobj
= kobject_create_and_add("dev", NULL
);
1403 sysfs_dev_block_kobj
= kobject_create_and_add("block", dev_kobj
);
1404 if (!sysfs_dev_block_kobj
)
1405 goto block_kobj_err
;
1406 sysfs_dev_char_kobj
= kobject_create_and_add("char", dev_kobj
);
1407 if (!sysfs_dev_char_kobj
)
1413 kobject_put(sysfs_dev_block_kobj
);
1415 kobject_put(dev_kobj
);
1417 kset_unregister(devices_kset
);
1421 EXPORT_SYMBOL_GPL(device_for_each_child
);
1422 EXPORT_SYMBOL_GPL(device_find_child
);
1424 EXPORT_SYMBOL_GPL(device_initialize
);
1425 EXPORT_SYMBOL_GPL(device_add
);
1426 EXPORT_SYMBOL_GPL(device_register
);
1428 EXPORT_SYMBOL_GPL(device_del
);
1429 EXPORT_SYMBOL_GPL(device_unregister
);
1430 EXPORT_SYMBOL_GPL(get_device
);
1431 EXPORT_SYMBOL_GPL(put_device
);
1433 EXPORT_SYMBOL_GPL(device_create_file
);
1434 EXPORT_SYMBOL_GPL(device_remove_file
);
1436 struct root_device
{
1438 struct module
*owner
;
1441 static inline struct root_device
*to_root_device(struct device
*d
)
1443 return container_of(d
, struct root_device
, dev
);
1446 static void root_device_release(struct device
*dev
)
1448 kfree(to_root_device(dev
));
1452 * __root_device_register - allocate and register a root device
1453 * @name: root device name
1454 * @owner: owner module of the root device, usually THIS_MODULE
1456 * This function allocates a root device and registers it
1457 * using device_register(). In order to free the returned
1458 * device, use root_device_unregister().
1460 * Root devices are dummy devices which allow other devices
1461 * to be grouped under /sys/devices. Use this function to
1462 * allocate a root device and then use it as the parent of
1463 * any device which should appear under /sys/devices/{name}
1465 * The /sys/devices/{name} directory will also contain a
1466 * 'module' symlink which points to the @owner directory
1469 * Returns &struct device pointer on success, or ERR_PTR() on error.
1471 * Note: You probably want to use root_device_register().
1473 struct device
*__root_device_register(const char *name
, struct module
*owner
)
1475 struct root_device
*root
;
1478 root
= kzalloc(sizeof(struct root_device
), GFP_KERNEL
);
1480 return ERR_PTR(err
);
1482 err
= dev_set_name(&root
->dev
, "%s", name
);
1485 return ERR_PTR(err
);
1488 root
->dev
.release
= root_device_release
;
1490 err
= device_register(&root
->dev
);
1492 put_device(&root
->dev
);
1493 return ERR_PTR(err
);
1496 #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */
1498 struct module_kobject
*mk
= &owner
->mkobj
;
1500 err
= sysfs_create_link(&root
->dev
.kobj
, &mk
->kobj
, "module");
1502 device_unregister(&root
->dev
);
1503 return ERR_PTR(err
);
1505 root
->owner
= owner
;
1511 EXPORT_SYMBOL_GPL(__root_device_register
);
1514 * root_device_unregister - unregister and free a root device
1515 * @dev: device going away
1517 * This function unregisters and cleans up a device that was created by
1518 * root_device_register().
1520 void root_device_unregister(struct device
*dev
)
1522 struct root_device
*root
= to_root_device(dev
);
1525 sysfs_remove_link(&root
->dev
.kobj
, "module");
1527 device_unregister(dev
);
1529 EXPORT_SYMBOL_GPL(root_device_unregister
);
1532 static void device_create_release(struct device
*dev
)
1534 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1539 * device_create_vargs - creates a device and registers it with sysfs
1540 * @class: pointer to the struct class that this device should be registered to
1541 * @parent: pointer to the parent struct device of this new device, if any
1542 * @devt: the dev_t for the char device to be added
1543 * @drvdata: the data to be added to the device for callbacks
1544 * @fmt: string for the device's name
1545 * @args: va_list for the device's name
1547 * This function can be used by char device classes. A struct device
1548 * will be created in sysfs, registered to the specified class.
1550 * A "dev" file will be created, showing the dev_t for the device, if
1551 * the dev_t is not 0,0.
1552 * If a pointer to a parent struct device is passed in, the newly created
1553 * struct device will be a child of that device in sysfs.
1554 * The pointer to the struct device will be returned from the call.
1555 * Any further sysfs files that might be required can be created using this
1558 * Returns &struct device pointer on success, or ERR_PTR() on error.
1560 * Note: the struct class passed to this function must have previously
1561 * been created with a call to class_create().
1563 struct device
*device_create_vargs(struct class *class, struct device
*parent
,
1564 dev_t devt
, void *drvdata
, const char *fmt
,
1567 struct device
*dev
= NULL
;
1568 int retval
= -ENODEV
;
1570 if (class == NULL
|| IS_ERR(class))
1573 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
1581 dev
->parent
= parent
;
1582 dev
->release
= device_create_release
;
1583 dev_set_drvdata(dev
, drvdata
);
1585 retval
= kobject_set_name_vargs(&dev
->kobj
, fmt
, args
);
1589 retval
= device_register(dev
);
1597 return ERR_PTR(retval
);
1599 EXPORT_SYMBOL_GPL(device_create_vargs
);
1602 * device_create - creates a device and registers it with sysfs
1603 * @class: pointer to the struct class that this device should be registered to
1604 * @parent: pointer to the parent struct device of this new device, if any
1605 * @devt: the dev_t for the char device to be added
1606 * @drvdata: the data to be added to the device for callbacks
1607 * @fmt: string for the device's name
1609 * This function can be used by char device classes. A struct device
1610 * will be created in sysfs, registered to the specified class.
1612 * A "dev" file will be created, showing the dev_t for the device, if
1613 * the dev_t is not 0,0.
1614 * If a pointer to a parent struct device is passed in, the newly created
1615 * struct device will be a child of that device in sysfs.
1616 * The pointer to the struct device will be returned from the call.
1617 * Any further sysfs files that might be required can be created using this
1620 * Returns &struct device pointer on success, or ERR_PTR() on error.
1622 * Note: the struct class passed to this function must have previously
1623 * been created with a call to class_create().
1625 struct device
*device_create(struct class *class, struct device
*parent
,
1626 dev_t devt
, void *drvdata
, const char *fmt
, ...)
1631 va_start(vargs
, fmt
);
1632 dev
= device_create_vargs(class, parent
, devt
, drvdata
, fmt
, vargs
);
1636 EXPORT_SYMBOL_GPL(device_create
);
1638 static int __match_devt(struct device
*dev
, const void *data
)
1640 const dev_t
*devt
= data
;
1642 return dev
->devt
== *devt
;
1646 * device_destroy - removes a device that was created with device_create()
1647 * @class: pointer to the struct class that this device was registered with
1648 * @devt: the dev_t of the device that was previously registered
1650 * This call unregisters and cleans up a device that was created with a
1651 * call to device_create().
1653 void device_destroy(struct class *class, dev_t devt
)
1657 dev
= class_find_device(class, NULL
, &devt
, __match_devt
);
1660 device_unregister(dev
);
1663 EXPORT_SYMBOL_GPL(device_destroy
);
1666 * device_rename - renames a device
1667 * @dev: the pointer to the struct device to be renamed
1668 * @new_name: the new name of the device
1670 * It is the responsibility of the caller to provide mutual
1671 * exclusion between two different calls of device_rename
1672 * on the same device to ensure that new_name is valid and
1673 * won't conflict with other devices.
1675 * Note: Don't call this function. Currently, the networking layer calls this
1676 * function, but that will change. The following text from Kay Sievers offers
1679 * Renaming devices is racy at many levels, symlinks and other stuff are not
1680 * replaced atomically, and you get a "move" uevent, but it's not easy to
1681 * connect the event to the old and new device. Device nodes are not renamed at
1682 * all, there isn't even support for that in the kernel now.
1684 * In the meantime, during renaming, your target name might be taken by another
1685 * driver, creating conflicts. Or the old name is taken directly after you
1686 * renamed it -- then you get events for the same DEVPATH, before you even see
1687 * the "move" event. It's just a mess, and nothing new should ever rely on
1688 * kernel device renaming. Besides that, it's not even implemented now for
1689 * other things than (driver-core wise very simple) network devices.
1691 * We are currently about to change network renaming in udev to completely
1692 * disallow renaming of devices in the same namespace as the kernel uses,
1693 * because we can't solve the problems properly, that arise with swapping names
1694 * of multiple interfaces without races. Means, renaming of eth[0-9]* will only
1695 * be allowed to some other name than eth[0-9]*, for the aforementioned
1698 * Make up a "real" name in the driver before you register anything, or add
1699 * some other attributes for userspace to find the device, or use udev to add
1700 * symlinks -- but never rename kernel devices later, it's a complete mess. We
1701 * don't even want to get into that and try to implement the missing pieces in
1702 * the core. We really have other pieces to fix in the driver core mess. :)
1704 int device_rename(struct device
*dev
, const char *new_name
)
1706 char *old_device_name
= NULL
;
1709 dev
= get_device(dev
);
1713 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev
),
1714 __func__
, new_name
);
1716 old_device_name
= kstrdup(dev_name(dev
), GFP_KERNEL
);
1717 if (!old_device_name
) {
1723 error
= sysfs_rename_link(&dev
->class->p
->subsys
.kobj
,
1724 &dev
->kobj
, old_device_name
, new_name
);
1729 error
= kobject_rename(&dev
->kobj
, new_name
);
1736 kfree(old_device_name
);
1740 EXPORT_SYMBOL_GPL(device_rename
);
1742 static int device_move_class_links(struct device
*dev
,
1743 struct device
*old_parent
,
1744 struct device
*new_parent
)
1749 sysfs_remove_link(&dev
->kobj
, "device");
1751 error
= sysfs_create_link(&dev
->kobj
, &new_parent
->kobj
,
1757 * device_move - moves a device to a new parent
1758 * @dev: the pointer to the struct device to be moved
1759 * @new_parent: the new parent of the device (can by NULL)
1760 * @dpm_order: how to reorder the dpm_list
1762 int device_move(struct device
*dev
, struct device
*new_parent
,
1763 enum dpm_order dpm_order
)
1766 struct device
*old_parent
;
1767 struct kobject
*new_parent_kobj
;
1769 dev
= get_device(dev
);
1774 new_parent
= get_device(new_parent
);
1775 new_parent_kobj
= get_device_parent(dev
, new_parent
);
1777 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev
),
1778 __func__
, new_parent
? dev_name(new_parent
) : "<NULL>");
1779 error
= kobject_move(&dev
->kobj
, new_parent_kobj
);
1781 cleanup_glue_dir(dev
, new_parent_kobj
);
1782 put_device(new_parent
);
1785 old_parent
= dev
->parent
;
1786 dev
->parent
= new_parent
;
1788 klist_remove(&dev
->p
->knode_parent
);
1790 klist_add_tail(&dev
->p
->knode_parent
,
1791 &new_parent
->p
->klist_children
);
1792 set_dev_node(dev
, dev_to_node(new_parent
));
1796 error
= device_move_class_links(dev
, old_parent
, new_parent
);
1798 /* We ignore errors on cleanup since we're hosed anyway... */
1799 device_move_class_links(dev
, new_parent
, old_parent
);
1800 if (!kobject_move(&dev
->kobj
, &old_parent
->kobj
)) {
1802 klist_remove(&dev
->p
->knode_parent
);
1803 dev
->parent
= old_parent
;
1805 klist_add_tail(&dev
->p
->knode_parent
,
1806 &old_parent
->p
->klist_children
);
1807 set_dev_node(dev
, dev_to_node(old_parent
));
1810 cleanup_glue_dir(dev
, new_parent_kobj
);
1811 put_device(new_parent
);
1815 switch (dpm_order
) {
1816 case DPM_ORDER_NONE
:
1818 case DPM_ORDER_DEV_AFTER_PARENT
:
1819 device_pm_move_after(dev
, new_parent
);
1821 case DPM_ORDER_PARENT_BEFORE_DEV
:
1822 device_pm_move_before(new_parent
, dev
);
1824 case DPM_ORDER_DEV_LAST
:
1825 device_pm_move_last(dev
);
1829 put_device(old_parent
);
1835 EXPORT_SYMBOL_GPL(device_move
);
1838 * device_shutdown - call ->shutdown() on each device to shutdown.
1840 void device_shutdown(void)
1844 spin_lock(&devices_kset
->list_lock
);
1846 * Walk the devices list backward, shutting down each in turn.
1847 * Beware that device unplug events may also start pulling
1848 * devices offline, even as the system is shutting down.
1850 while (!list_empty(&devices_kset
->list
)) {
1851 dev
= list_entry(devices_kset
->list
.prev
, struct device
,
1855 * hold reference count of device's parent to
1856 * prevent it from being freed because parent's
1857 * lock is to be held
1859 get_device(dev
->parent
);
1862 * Make sure the device is off the kset list, in the
1863 * event that dev->*->shutdown() doesn't remove it.
1865 list_del_init(&dev
->kobj
.entry
);
1866 spin_unlock(&devices_kset
->list_lock
);
1868 /* hold lock to avoid race with probe/release */
1870 device_lock(dev
->parent
);
1873 /* Don't allow any more runtime suspends */
1874 pm_runtime_get_noresume(dev
);
1875 pm_runtime_barrier(dev
);
1877 if (dev
->bus
&& dev
->bus
->shutdown
) {
1879 dev_info(dev
, "shutdown\n");
1880 dev
->bus
->shutdown(dev
);
1881 } else if (dev
->driver
&& dev
->driver
->shutdown
) {
1883 dev_info(dev
, "shutdown\n");
1884 dev
->driver
->shutdown(dev
);
1889 device_unlock(dev
->parent
);
1892 put_device(dev
->parent
);
1894 spin_lock(&devices_kset
->list_lock
);
1896 spin_unlock(&devices_kset
->list_lock
);
1897 async_synchronize_full();
1901 * Device logging functions
1904 #ifdef CONFIG_PRINTK
1906 create_syslog_header(const struct device
*dev
, char *hdr
, size_t hdrlen
)
1912 subsys
= dev
->class->name
;
1914 subsys
= dev
->bus
->name
;
1918 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
, "SUBSYSTEM=%s", subsys
);
1921 * Add device identifier DEVICE=:
1925 * +sound:card0 subsystem:devname
1927 if (MAJOR(dev
->devt
)) {
1930 if (strcmp(subsys
, "block") == 0)
1935 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
,
1937 c
, MAJOR(dev
->devt
), MINOR(dev
->devt
));
1938 } else if (strcmp(subsys
, "net") == 0) {
1939 struct net_device
*net
= to_net_dev(dev
);
1942 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
,
1943 "DEVICE=n%u", net
->ifindex
);
1946 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
,
1947 "DEVICE=+%s:%s", subsys
, dev_name(dev
));
1952 EXPORT_SYMBOL(create_syslog_header
);
1954 int dev_vprintk_emit(int level
, const struct device
*dev
,
1955 const char *fmt
, va_list args
)
1960 hdrlen
= create_syslog_header(dev
, hdr
, sizeof(hdr
));
1962 return vprintk_emit(0, level
, hdrlen
? hdr
: NULL
, hdrlen
, fmt
, args
);
1964 EXPORT_SYMBOL(dev_vprintk_emit
);
1966 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...)
1971 va_start(args
, fmt
);
1973 r
= dev_vprintk_emit(level
, dev
, fmt
, args
);
1979 EXPORT_SYMBOL(dev_printk_emit
);
1981 static int __dev_printk(const char *level
, const struct device
*dev
,
1982 struct va_format
*vaf
)
1985 return printk("%s(NULL device *): %pV", level
, vaf
);
1987 return dev_printk_emit(level
[1] - '0', dev
,
1989 dev_driver_string(dev
), dev_name(dev
), vaf
);
1992 int dev_printk(const char *level
, const struct device
*dev
,
1993 const char *fmt
, ...)
1995 struct va_format vaf
;
1999 va_start(args
, fmt
);
2004 r
= __dev_printk(level
, dev
, &vaf
);
2010 EXPORT_SYMBOL(dev_printk
);
2012 #define define_dev_printk_level(func, kern_level) \
2013 int func(const struct device *dev, const char *fmt, ...) \
2015 struct va_format vaf; \
2019 va_start(args, fmt); \
2024 r = __dev_printk(kern_level, dev, &vaf); \
2030 EXPORT_SYMBOL(func);
2032 define_dev_printk_level(dev_emerg
, KERN_EMERG
);
2033 define_dev_printk_level(dev_alert
, KERN_ALERT
);
2034 define_dev_printk_level(dev_crit
, KERN_CRIT
);
2035 define_dev_printk_level(dev_err
, KERN_ERR
);
2036 define_dev_printk_level(dev_warn
, KERN_WARNING
);
2037 define_dev_printk_level(dev_notice
, KERN_NOTICE
);
2038 define_dev_printk_level(_dev_info
, KERN_INFO
);