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
);
768 static DEFINE_MUTEX(gdp_mutex
);
770 static struct kobject
*get_device_parent(struct device
*dev
,
771 struct device
*parent
)
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 inline bool live_in_glue_dir(struct kobject
*kobj
,
833 if (!kobj
|| !dev
->class ||
834 kobj
->kset
!= &dev
->class->p
->glue_dirs
)
839 static inline struct kobject
*get_glue_dir(struct device
*dev
)
841 return dev
->kobj
.parent
;
845 * make sure cleaning up dir as the last step, we need to make
846 * sure .release handler of kobject is run with holding the
849 static void cleanup_glue_dir(struct device
*dev
, struct kobject
*glue_dir
)
851 /* see if we live in a "glue" directory */
852 if (!live_in_glue_dir(glue_dir
, dev
))
855 mutex_lock(&gdp_mutex
);
856 kobject_put(glue_dir
);
857 mutex_unlock(&gdp_mutex
);
860 static int device_add_class_symlinks(struct device
*dev
)
867 error
= sysfs_create_link(&dev
->kobj
,
868 &dev
->class->p
->subsys
.kobj
,
873 if (dev
->parent
&& device_is_not_partition(dev
)) {
874 error
= sysfs_create_link(&dev
->kobj
, &dev
->parent
->kobj
,
881 /* /sys/block has directories and does not need symlinks */
882 if (sysfs_deprecated
&& dev
->class == &block_class
)
886 /* link in the class directory pointing to the device */
887 error
= sysfs_create_link(&dev
->class->p
->subsys
.kobj
,
888 &dev
->kobj
, dev_name(dev
));
895 sysfs_remove_link(&dev
->kobj
, "device");
898 sysfs_remove_link(&dev
->kobj
, "subsystem");
903 static void device_remove_class_symlinks(struct device
*dev
)
908 if (dev
->parent
&& device_is_not_partition(dev
))
909 sysfs_remove_link(&dev
->kobj
, "device");
910 sysfs_remove_link(&dev
->kobj
, "subsystem");
912 if (sysfs_deprecated
&& dev
->class == &block_class
)
915 sysfs_delete_link(&dev
->class->p
->subsys
.kobj
, &dev
->kobj
, dev_name(dev
));
919 * dev_set_name - set a device name
921 * @fmt: format string for the device's name
923 int dev_set_name(struct device
*dev
, const char *fmt
, ...)
928 va_start(vargs
, fmt
);
929 err
= kobject_set_name_vargs(&dev
->kobj
, fmt
, vargs
);
933 EXPORT_SYMBOL_GPL(dev_set_name
);
936 * device_to_dev_kobj - select a /sys/dev/ directory for the device
939 * By default we select char/ for new entries. Setting class->dev_obj
940 * to NULL prevents an entry from being created. class->dev_kobj must
941 * be set (or cleared) before any devices are registered to the class
942 * otherwise device_create_sys_dev_entry() and
943 * device_remove_sys_dev_entry() will disagree about the presence of
946 static struct kobject
*device_to_dev_kobj(struct device
*dev
)
948 struct kobject
*kobj
;
951 kobj
= dev
->class->dev_kobj
;
953 kobj
= sysfs_dev_char_kobj
;
958 static int device_create_sys_dev_entry(struct device
*dev
)
960 struct kobject
*kobj
= device_to_dev_kobj(dev
);
965 format_dev_t(devt_str
, dev
->devt
);
966 error
= sysfs_create_link(kobj
, &dev
->kobj
, devt_str
);
972 static void device_remove_sys_dev_entry(struct device
*dev
)
974 struct kobject
*kobj
= device_to_dev_kobj(dev
);
978 format_dev_t(devt_str
, dev
->devt
);
979 sysfs_remove_link(kobj
, devt_str
);
983 int device_private_init(struct device
*dev
)
985 dev
->p
= kzalloc(sizeof(*dev
->p
), GFP_KERNEL
);
988 dev
->p
->device
= dev
;
989 klist_init(&dev
->p
->klist_children
, klist_children_get
,
991 INIT_LIST_HEAD(&dev
->p
->deferred_probe
);
996 * device_add - add device to device hierarchy.
999 * This is part 2 of device_register(), though may be called
1000 * separately _iff_ device_initialize() has been called separately.
1002 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
1003 * to the global and sibling lists for the device, then
1004 * adds it to the other relevant subsystems of the driver model.
1006 * Do not call this routine or device_register() more than once for
1007 * any device structure. The driver model core is not designed to work
1008 * with devices that get unregistered and then spring back to life.
1009 * (Among other things, it's very hard to guarantee that all references
1010 * to the previous incarnation of @dev have been dropped.) Allocate
1011 * and register a fresh new struct device instead.
1013 * NOTE: _Never_ directly free @dev after calling this function, even
1014 * if it returned an error! Always use put_device() to give up your
1015 * reference instead.
1017 int device_add(struct device
*dev
)
1019 struct device
*parent
= NULL
;
1020 struct kobject
*kobj
;
1021 struct class_interface
*class_intf
;
1022 int error
= -EINVAL
;
1023 struct kobject
*glue_dir
= NULL
;
1025 dev
= get_device(dev
);
1030 error
= device_private_init(dev
);
1036 * for statically allocated devices, which should all be converted
1037 * some day, we need to initialize the name. We prevent reading back
1038 * the name, and force the use of dev_name()
1040 if (dev
->init_name
) {
1041 dev_set_name(dev
, "%s", dev
->init_name
);
1042 dev
->init_name
= NULL
;
1045 /* subsystems can specify simple device enumeration */
1046 if (!dev_name(dev
) && dev
->bus
&& dev
->bus
->dev_name
)
1047 dev_set_name(dev
, "%s%u", dev
->bus
->dev_name
, dev
->id
);
1049 if (!dev_name(dev
)) {
1054 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1056 parent
= get_device(dev
->parent
);
1057 kobj
= get_device_parent(dev
, parent
);
1059 dev
->kobj
.parent
= kobj
;
1061 /* use parent numa_node */
1063 set_dev_node(dev
, dev_to_node(parent
));
1065 /* first, register with generic layer. */
1066 /* we require the name to be set before, and pass NULL */
1067 error
= kobject_add(&dev
->kobj
, dev
->kobj
.parent
, NULL
);
1069 glue_dir
= get_glue_dir(dev
);
1073 /* notify platform of device entry */
1074 if (platform_notify
)
1075 platform_notify(dev
);
1077 error
= device_create_file(dev
, &uevent_attr
);
1081 if (MAJOR(dev
->devt
)) {
1082 error
= device_create_file(dev
, &devt_attr
);
1084 goto ueventattrError
;
1086 error
= device_create_sys_dev_entry(dev
);
1090 devtmpfs_create_node(dev
);
1093 error
= device_add_class_symlinks(dev
);
1096 error
= device_add_attrs(dev
);
1099 error
= bus_add_device(dev
);
1102 error
= dpm_sysfs_add(dev
);
1107 /* Notify clients of device addition. This call must come
1108 * after dpm_sysfs_add() and before kobject_uevent().
1111 blocking_notifier_call_chain(&dev
->bus
->p
->bus_notifier
,
1112 BUS_NOTIFY_ADD_DEVICE
, dev
);
1114 kobject_uevent(&dev
->kobj
, KOBJ_ADD
);
1115 bus_probe_device(dev
);
1117 klist_add_tail(&dev
->p
->knode_parent
,
1118 &parent
->p
->klist_children
);
1121 mutex_lock(&dev
->class->p
->mutex
);
1122 /* tie the class to the device */
1123 klist_add_tail(&dev
->knode_class
,
1124 &dev
->class->p
->klist_devices
);
1126 /* notify any interfaces that the device is here */
1127 list_for_each_entry(class_intf
,
1128 &dev
->class->p
->interfaces
, node
)
1129 if (class_intf
->add_dev
)
1130 class_intf
->add_dev(dev
, class_intf
);
1131 mutex_unlock(&dev
->class->p
->mutex
);
1137 bus_remove_device(dev
);
1139 device_remove_attrs(dev
);
1141 device_remove_class_symlinks(dev
);
1143 if (MAJOR(dev
->devt
))
1144 devtmpfs_delete_node(dev
);
1145 if (MAJOR(dev
->devt
))
1146 device_remove_sys_dev_entry(dev
);
1148 if (MAJOR(dev
->devt
))
1149 device_remove_file(dev
, &devt_attr
);
1151 device_remove_file(dev
, &uevent_attr
);
1153 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
1154 glue_dir
= get_glue_dir(dev
);
1155 kobject_del(&dev
->kobj
);
1157 cleanup_glue_dir(dev
, glue_dir
);
1166 * device_register - register a device with the system.
1167 * @dev: pointer to the device structure
1169 * This happens in two clean steps - initialize the device
1170 * and add it to the system. The two steps can be called
1171 * separately, but this is the easiest and most common.
1172 * I.e. you should only call the two helpers separately if
1173 * have a clearly defined need to use and refcount the device
1174 * before it is added to the hierarchy.
1176 * For more information, see the kerneldoc for device_initialize()
1179 * NOTE: _Never_ directly free @dev after calling this function, even
1180 * if it returned an error! Always use put_device() to give up the
1181 * reference initialized in this function instead.
1183 int device_register(struct device
*dev
)
1185 device_initialize(dev
);
1186 return device_add(dev
);
1190 * get_device - increment reference count for device.
1193 * This simply forwards the call to kobject_get(), though
1194 * we do take care to provide for the case that we get a NULL
1195 * pointer passed in.
1197 struct device
*get_device(struct device
*dev
)
1199 return dev
? kobj_to_dev(kobject_get(&dev
->kobj
)) : NULL
;
1203 * put_device - decrement reference count.
1204 * @dev: device in question.
1206 void put_device(struct device
*dev
)
1208 /* might_sleep(); */
1210 kobject_put(&dev
->kobj
);
1214 * device_del - delete device from system.
1217 * This is the first part of the device unregistration
1218 * sequence. This removes the device from the lists we control
1219 * from here, has it removed from the other driver model
1220 * subsystems it was added to in device_add(), and removes it
1221 * from the kobject hierarchy.
1223 * NOTE: this should be called manually _iff_ device_add() was
1224 * also called manually.
1226 void device_del(struct device
*dev
)
1228 struct device
*parent
= dev
->parent
;
1229 struct kobject
*glue_dir
= NULL
;
1230 struct class_interface
*class_intf
;
1232 /* Notify clients of device removal. This call must come
1233 * before dpm_sysfs_remove().
1236 blocking_notifier_call_chain(&dev
->bus
->p
->bus_notifier
,
1237 BUS_NOTIFY_DEL_DEVICE
, dev
);
1238 dpm_sysfs_remove(dev
);
1240 klist_del(&dev
->p
->knode_parent
);
1241 if (MAJOR(dev
->devt
)) {
1242 devtmpfs_delete_node(dev
);
1243 device_remove_sys_dev_entry(dev
);
1244 device_remove_file(dev
, &devt_attr
);
1247 device_remove_class_symlinks(dev
);
1249 mutex_lock(&dev
->class->p
->mutex
);
1250 /* notify any interfaces that the device is now gone */
1251 list_for_each_entry(class_intf
,
1252 &dev
->class->p
->interfaces
, node
)
1253 if (class_intf
->remove_dev
)
1254 class_intf
->remove_dev(dev
, class_intf
);
1255 /* remove the device from the class list */
1256 klist_del(&dev
->knode_class
);
1257 mutex_unlock(&dev
->class->p
->mutex
);
1259 device_remove_file(dev
, &uevent_attr
);
1260 device_remove_attrs(dev
);
1261 bus_remove_device(dev
);
1262 device_pm_remove(dev
);
1263 driver_deferred_probe_del(dev
);
1265 /* Notify the platform of the removal, in case they
1266 * need to do anything...
1268 if (platform_notify_remove
)
1269 platform_notify_remove(dev
);
1270 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
1271 glue_dir
= get_glue_dir(dev
);
1272 kobject_del(&dev
->kobj
);
1273 cleanup_glue_dir(dev
, glue_dir
);
1278 * device_unregister - unregister device from system.
1279 * @dev: device going away.
1281 * We do this in two parts, like we do device_register(). First,
1282 * we remove it from all the subsystems with device_del(), then
1283 * we decrement the reference count via put_device(). If that
1284 * is the final reference count, the device will be cleaned up
1285 * via device_release() above. Otherwise, the structure will
1286 * stick around until the final reference to the device is dropped.
1288 void device_unregister(struct device
*dev
)
1290 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1295 static struct device
*next_device(struct klist_iter
*i
)
1297 struct klist_node
*n
= klist_next(i
);
1298 struct device
*dev
= NULL
;
1299 struct device_private
*p
;
1302 p
= to_device_private_parent(n
);
1309 * device_get_devnode - path of device node file
1311 * @mode: returned file access mode
1312 * @uid: returned file owner
1313 * @gid: returned file group
1314 * @tmp: possibly allocated string
1316 * Return the relative path of a possible device node.
1317 * Non-default names may need to allocate a memory to compose
1318 * a name. This memory is returned in tmp and needs to be
1319 * freed by the caller.
1321 const char *device_get_devnode(struct device
*dev
,
1322 umode_t
*mode
, kuid_t
*uid
, kgid_t
*gid
,
1329 /* the device type may provide a specific name */
1330 if (dev
->type
&& dev
->type
->devnode
)
1331 *tmp
= dev
->type
->devnode(dev
, mode
, uid
, gid
);
1335 /* the class may provide a specific name */
1336 if (dev
->class && dev
->class->devnode
)
1337 *tmp
= dev
->class->devnode(dev
, mode
);
1341 /* return name without allocation, tmp == NULL */
1342 if (strchr(dev_name(dev
), '!') == NULL
)
1343 return dev_name(dev
);
1345 /* replace '!' in the name with '/' */
1346 *tmp
= kstrdup(dev_name(dev
), GFP_KERNEL
);
1349 while ((s
= strchr(*tmp
, '!')))
1355 * device_for_each_child - device child iterator.
1356 * @parent: parent struct device.
1357 * @data: data for the callback.
1358 * @fn: function to be called for each device.
1360 * Iterate over @parent's child devices, and call @fn for each,
1363 * We check the return of @fn each time. If it returns anything
1364 * other than 0, we break out and return that value.
1366 int device_for_each_child(struct device
*parent
, void *data
,
1367 int (*fn
)(struct device
*dev
, void *data
))
1369 struct klist_iter i
;
1370 struct device
*child
;
1376 klist_iter_init(&parent
->p
->klist_children
, &i
);
1377 while ((child
= next_device(&i
)) && !error
)
1378 error
= fn(child
, data
);
1379 klist_iter_exit(&i
);
1384 * device_find_child - device iterator for locating a particular device.
1385 * @parent: parent struct device
1386 * @data: Data to pass to match function
1387 * @match: Callback function to check device
1389 * This is similar to the device_for_each_child() function above, but it
1390 * returns a reference to a device that is 'found' for later use, as
1391 * determined by the @match callback.
1393 * The callback should return 0 if the device doesn't match and non-zero
1394 * if it does. If the callback returns non-zero and a reference to the
1395 * current device can be obtained, this function will return to the caller
1396 * and not iterate over any more devices.
1398 struct device
*device_find_child(struct device
*parent
, void *data
,
1399 int (*match
)(struct device
*dev
, void *data
))
1401 struct klist_iter i
;
1402 struct device
*child
;
1407 klist_iter_init(&parent
->p
->klist_children
, &i
);
1408 while ((child
= next_device(&i
)))
1409 if (match(child
, data
) && get_device(child
))
1411 klist_iter_exit(&i
);
1415 int __init
devices_init(void)
1417 devices_kset
= kset_create_and_add("devices", &device_uevent_ops
, NULL
);
1420 dev_kobj
= kobject_create_and_add("dev", NULL
);
1423 sysfs_dev_block_kobj
= kobject_create_and_add("block", dev_kobj
);
1424 if (!sysfs_dev_block_kobj
)
1425 goto block_kobj_err
;
1426 sysfs_dev_char_kobj
= kobject_create_and_add("char", dev_kobj
);
1427 if (!sysfs_dev_char_kobj
)
1433 kobject_put(sysfs_dev_block_kobj
);
1435 kobject_put(dev_kobj
);
1437 kset_unregister(devices_kset
);
1441 EXPORT_SYMBOL_GPL(device_for_each_child
);
1442 EXPORT_SYMBOL_GPL(device_find_child
);
1444 EXPORT_SYMBOL_GPL(device_initialize
);
1445 EXPORT_SYMBOL_GPL(device_add
);
1446 EXPORT_SYMBOL_GPL(device_register
);
1448 EXPORT_SYMBOL_GPL(device_del
);
1449 EXPORT_SYMBOL_GPL(device_unregister
);
1450 EXPORT_SYMBOL_GPL(get_device
);
1451 EXPORT_SYMBOL_GPL(put_device
);
1453 EXPORT_SYMBOL_GPL(device_create_file
);
1454 EXPORT_SYMBOL_GPL(device_remove_file
);
1456 struct root_device
{
1458 struct module
*owner
;
1461 static inline struct root_device
*to_root_device(struct device
*d
)
1463 return container_of(d
, struct root_device
, dev
);
1466 static void root_device_release(struct device
*dev
)
1468 kfree(to_root_device(dev
));
1472 * __root_device_register - allocate and register a root device
1473 * @name: root device name
1474 * @owner: owner module of the root device, usually THIS_MODULE
1476 * This function allocates a root device and registers it
1477 * using device_register(). In order to free the returned
1478 * device, use root_device_unregister().
1480 * Root devices are dummy devices which allow other devices
1481 * to be grouped under /sys/devices. Use this function to
1482 * allocate a root device and then use it as the parent of
1483 * any device which should appear under /sys/devices/{name}
1485 * The /sys/devices/{name} directory will also contain a
1486 * 'module' symlink which points to the @owner directory
1489 * Returns &struct device pointer on success, or ERR_PTR() on error.
1491 * Note: You probably want to use root_device_register().
1493 struct device
*__root_device_register(const char *name
, struct module
*owner
)
1495 struct root_device
*root
;
1498 root
= kzalloc(sizeof(struct root_device
), GFP_KERNEL
);
1500 return ERR_PTR(err
);
1502 err
= dev_set_name(&root
->dev
, "%s", name
);
1505 return ERR_PTR(err
);
1508 root
->dev
.release
= root_device_release
;
1510 err
= device_register(&root
->dev
);
1512 put_device(&root
->dev
);
1513 return ERR_PTR(err
);
1516 #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */
1518 struct module_kobject
*mk
= &owner
->mkobj
;
1520 err
= sysfs_create_link(&root
->dev
.kobj
, &mk
->kobj
, "module");
1522 device_unregister(&root
->dev
);
1523 return ERR_PTR(err
);
1525 root
->owner
= owner
;
1531 EXPORT_SYMBOL_GPL(__root_device_register
);
1534 * root_device_unregister - unregister and free a root device
1535 * @dev: device going away
1537 * This function unregisters and cleans up a device that was created by
1538 * root_device_register().
1540 void root_device_unregister(struct device
*dev
)
1542 struct root_device
*root
= to_root_device(dev
);
1545 sysfs_remove_link(&root
->dev
.kobj
, "module");
1547 device_unregister(dev
);
1549 EXPORT_SYMBOL_GPL(root_device_unregister
);
1552 static void device_create_release(struct device
*dev
)
1554 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1559 * device_create_vargs - creates a device and registers it with sysfs
1560 * @class: pointer to the struct class that this device should be registered to
1561 * @parent: pointer to the parent struct device of this new device, if any
1562 * @devt: the dev_t for the char device to be added
1563 * @drvdata: the data to be added to the device for callbacks
1564 * @fmt: string for the device's name
1565 * @args: va_list for the device's name
1567 * This function can be used by char device classes. A struct device
1568 * will be created in sysfs, registered to the specified class.
1570 * A "dev" file will be created, showing the dev_t for the device, if
1571 * the dev_t is not 0,0.
1572 * If a pointer to a parent struct device is passed in, the newly created
1573 * struct device will be a child of that device in sysfs.
1574 * The pointer to the struct device will be returned from the call.
1575 * Any further sysfs files that might be required can be created using this
1578 * Returns &struct device pointer on success, or ERR_PTR() on error.
1580 * Note: the struct class passed to this function must have previously
1581 * been created with a call to class_create().
1583 struct device
*device_create_vargs(struct class *class, struct device
*parent
,
1584 dev_t devt
, void *drvdata
, const char *fmt
,
1587 struct device
*dev
= NULL
;
1588 int retval
= -ENODEV
;
1590 if (class == NULL
|| IS_ERR(class))
1593 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
1601 dev
->parent
= parent
;
1602 dev
->release
= device_create_release
;
1603 dev_set_drvdata(dev
, drvdata
);
1605 retval
= kobject_set_name_vargs(&dev
->kobj
, fmt
, args
);
1609 retval
= device_register(dev
);
1617 return ERR_PTR(retval
);
1619 EXPORT_SYMBOL_GPL(device_create_vargs
);
1622 * device_create - creates a device and registers it with sysfs
1623 * @class: pointer to the struct class that this device should be registered to
1624 * @parent: pointer to the parent struct device of this new device, if any
1625 * @devt: the dev_t for the char device to be added
1626 * @drvdata: the data to be added to the device for callbacks
1627 * @fmt: string for the device's name
1629 * This function can be used by char device classes. A struct device
1630 * will be created in sysfs, registered to the specified class.
1632 * A "dev" file will be created, showing the dev_t for the device, if
1633 * the dev_t is not 0,0.
1634 * If a pointer to a parent struct device is passed in, the newly created
1635 * struct device will be a child of that device in sysfs.
1636 * The pointer to the struct device will be returned from the call.
1637 * Any further sysfs files that might be required can be created using this
1640 * Returns &struct device pointer on success, or ERR_PTR() on error.
1642 * Note: the struct class passed to this function must have previously
1643 * been created with a call to class_create().
1645 struct device
*device_create(struct class *class, struct device
*parent
,
1646 dev_t devt
, void *drvdata
, const char *fmt
, ...)
1651 va_start(vargs
, fmt
);
1652 dev
= device_create_vargs(class, parent
, devt
, drvdata
, fmt
, vargs
);
1656 EXPORT_SYMBOL_GPL(device_create
);
1658 static int __match_devt(struct device
*dev
, const void *data
)
1660 const dev_t
*devt
= data
;
1662 return dev
->devt
== *devt
;
1666 * device_destroy - removes a device that was created with device_create()
1667 * @class: pointer to the struct class that this device was registered with
1668 * @devt: the dev_t of the device that was previously registered
1670 * This call unregisters and cleans up a device that was created with a
1671 * call to device_create().
1673 void device_destroy(struct class *class, dev_t devt
)
1677 dev
= class_find_device(class, NULL
, &devt
, __match_devt
);
1680 device_unregister(dev
);
1683 EXPORT_SYMBOL_GPL(device_destroy
);
1686 * device_rename - renames a device
1687 * @dev: the pointer to the struct device to be renamed
1688 * @new_name: the new name of the device
1690 * It is the responsibility of the caller to provide mutual
1691 * exclusion between two different calls of device_rename
1692 * on the same device to ensure that new_name is valid and
1693 * won't conflict with other devices.
1695 * Note: Don't call this function. Currently, the networking layer calls this
1696 * function, but that will change. The following text from Kay Sievers offers
1699 * Renaming devices is racy at many levels, symlinks and other stuff are not
1700 * replaced atomically, and you get a "move" uevent, but it's not easy to
1701 * connect the event to the old and new device. Device nodes are not renamed at
1702 * all, there isn't even support for that in the kernel now.
1704 * In the meantime, during renaming, your target name might be taken by another
1705 * driver, creating conflicts. Or the old name is taken directly after you
1706 * renamed it -- then you get events for the same DEVPATH, before you even see
1707 * the "move" event. It's just a mess, and nothing new should ever rely on
1708 * kernel device renaming. Besides that, it's not even implemented now for
1709 * other things than (driver-core wise very simple) network devices.
1711 * We are currently about to change network renaming in udev to completely
1712 * disallow renaming of devices in the same namespace as the kernel uses,
1713 * because we can't solve the problems properly, that arise with swapping names
1714 * of multiple interfaces without races. Means, renaming of eth[0-9]* will only
1715 * be allowed to some other name than eth[0-9]*, for the aforementioned
1718 * Make up a "real" name in the driver before you register anything, or add
1719 * some other attributes for userspace to find the device, or use udev to add
1720 * symlinks -- but never rename kernel devices later, it's a complete mess. We
1721 * don't even want to get into that and try to implement the missing pieces in
1722 * the core. We really have other pieces to fix in the driver core mess. :)
1724 int device_rename(struct device
*dev
, const char *new_name
)
1726 char *old_device_name
= NULL
;
1729 dev
= get_device(dev
);
1733 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev
),
1734 __func__
, new_name
);
1736 old_device_name
= kstrdup(dev_name(dev
), GFP_KERNEL
);
1737 if (!old_device_name
) {
1743 error
= sysfs_rename_link(&dev
->class->p
->subsys
.kobj
,
1744 &dev
->kobj
, old_device_name
, new_name
);
1749 error
= kobject_rename(&dev
->kobj
, new_name
);
1756 kfree(old_device_name
);
1760 EXPORT_SYMBOL_GPL(device_rename
);
1762 static int device_move_class_links(struct device
*dev
,
1763 struct device
*old_parent
,
1764 struct device
*new_parent
)
1769 sysfs_remove_link(&dev
->kobj
, "device");
1771 error
= sysfs_create_link(&dev
->kobj
, &new_parent
->kobj
,
1777 * device_move - moves a device to a new parent
1778 * @dev: the pointer to the struct device to be moved
1779 * @new_parent: the new parent of the device (can by NULL)
1780 * @dpm_order: how to reorder the dpm_list
1782 int device_move(struct device
*dev
, struct device
*new_parent
,
1783 enum dpm_order dpm_order
)
1786 struct device
*old_parent
;
1787 struct kobject
*new_parent_kobj
;
1789 dev
= get_device(dev
);
1794 new_parent
= get_device(new_parent
);
1795 new_parent_kobj
= get_device_parent(dev
, new_parent
);
1797 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev
),
1798 __func__
, new_parent
? dev_name(new_parent
) : "<NULL>");
1799 error
= kobject_move(&dev
->kobj
, new_parent_kobj
);
1801 cleanup_glue_dir(dev
, new_parent_kobj
);
1802 put_device(new_parent
);
1805 old_parent
= dev
->parent
;
1806 dev
->parent
= new_parent
;
1808 klist_remove(&dev
->p
->knode_parent
);
1810 klist_add_tail(&dev
->p
->knode_parent
,
1811 &new_parent
->p
->klist_children
);
1812 set_dev_node(dev
, dev_to_node(new_parent
));
1816 error
= device_move_class_links(dev
, old_parent
, new_parent
);
1818 /* We ignore errors on cleanup since we're hosed anyway... */
1819 device_move_class_links(dev
, new_parent
, old_parent
);
1820 if (!kobject_move(&dev
->kobj
, &old_parent
->kobj
)) {
1822 klist_remove(&dev
->p
->knode_parent
);
1823 dev
->parent
= old_parent
;
1825 klist_add_tail(&dev
->p
->knode_parent
,
1826 &old_parent
->p
->klist_children
);
1827 set_dev_node(dev
, dev_to_node(old_parent
));
1830 cleanup_glue_dir(dev
, new_parent_kobj
);
1831 put_device(new_parent
);
1835 switch (dpm_order
) {
1836 case DPM_ORDER_NONE
:
1838 case DPM_ORDER_DEV_AFTER_PARENT
:
1839 device_pm_move_after(dev
, new_parent
);
1841 case DPM_ORDER_PARENT_BEFORE_DEV
:
1842 device_pm_move_before(new_parent
, dev
);
1844 case DPM_ORDER_DEV_LAST
:
1845 device_pm_move_last(dev
);
1849 put_device(old_parent
);
1855 EXPORT_SYMBOL_GPL(device_move
);
1858 * device_shutdown - call ->shutdown() on each device to shutdown.
1860 void device_shutdown(void)
1862 struct device
*dev
, *parent
;
1864 spin_lock(&devices_kset
->list_lock
);
1866 * Walk the devices list backward, shutting down each in turn.
1867 * Beware that device unplug events may also start pulling
1868 * devices offline, even as the system is shutting down.
1870 while (!list_empty(&devices_kset
->list
)) {
1871 dev
= list_entry(devices_kset
->list
.prev
, struct device
,
1875 * hold reference count of device's parent to
1876 * prevent it from being freed because parent's
1877 * lock is to be held
1879 parent
= get_device(dev
->parent
);
1882 * Make sure the device is off the kset list, in the
1883 * event that dev->*->shutdown() doesn't remove it.
1885 list_del_init(&dev
->kobj
.entry
);
1886 spin_unlock(&devices_kset
->list_lock
);
1888 /* hold lock to avoid race with probe/release */
1890 device_lock(parent
);
1893 /* Don't allow any more runtime suspends */
1894 pm_runtime_get_noresume(dev
);
1895 pm_runtime_barrier(dev
);
1897 if (dev
->bus
&& dev
->bus
->shutdown
) {
1899 dev_info(dev
, "shutdown\n");
1900 dev
->bus
->shutdown(dev
);
1901 } else if (dev
->driver
&& dev
->driver
->shutdown
) {
1903 dev_info(dev
, "shutdown\n");
1904 dev
->driver
->shutdown(dev
);
1909 device_unlock(parent
);
1914 spin_lock(&devices_kset
->list_lock
);
1916 spin_unlock(&devices_kset
->list_lock
);
1917 async_synchronize_full();
1921 * Device logging functions
1924 #ifdef CONFIG_PRINTK
1926 create_syslog_header(const struct device
*dev
, char *hdr
, size_t hdrlen
)
1932 subsys
= dev
->class->name
;
1934 subsys
= dev
->bus
->name
;
1938 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
, "SUBSYSTEM=%s", subsys
);
1941 * Add device identifier DEVICE=:
1945 * +sound:card0 subsystem:devname
1947 if (MAJOR(dev
->devt
)) {
1950 if (strcmp(subsys
, "block") == 0)
1955 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
,
1957 c
, MAJOR(dev
->devt
), MINOR(dev
->devt
));
1958 } else if (strcmp(subsys
, "net") == 0) {
1959 struct net_device
*net
= to_net_dev(dev
);
1962 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
,
1963 "DEVICE=n%u", net
->ifindex
);
1966 pos
+= snprintf(hdr
+ pos
, hdrlen
- pos
,
1967 "DEVICE=+%s:%s", subsys
, dev_name(dev
));
1972 EXPORT_SYMBOL(create_syslog_header
);
1974 int dev_vprintk_emit(int level
, const struct device
*dev
,
1975 const char *fmt
, va_list args
)
1980 hdrlen
= create_syslog_header(dev
, hdr
, sizeof(hdr
));
1982 return vprintk_emit(0, level
, hdrlen
? hdr
: NULL
, hdrlen
, fmt
, args
);
1984 EXPORT_SYMBOL(dev_vprintk_emit
);
1986 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...)
1991 va_start(args
, fmt
);
1993 r
= dev_vprintk_emit(level
, dev
, fmt
, args
);
1999 EXPORT_SYMBOL(dev_printk_emit
);
2001 static int __dev_printk(const char *level
, const struct device
*dev
,
2002 struct va_format
*vaf
)
2005 return printk("%s(NULL device *): %pV", level
, vaf
);
2007 return dev_printk_emit(level
[1] - '0', dev
,
2009 dev_driver_string(dev
), dev_name(dev
), vaf
);
2012 int dev_printk(const char *level
, const struct device
*dev
,
2013 const char *fmt
, ...)
2015 struct va_format vaf
;
2019 va_start(args
, fmt
);
2024 r
= __dev_printk(level
, dev
, &vaf
);
2030 EXPORT_SYMBOL(dev_printk
);
2032 #define define_dev_printk_level(func, kern_level) \
2033 int func(const struct device *dev, const char *fmt, ...) \
2035 struct va_format vaf; \
2039 va_start(args, fmt); \
2044 r = __dev_printk(kern_level, dev, &vaf); \
2050 EXPORT_SYMBOL(func);
2052 define_dev_printk_level(dev_emerg
, KERN_EMERG
);
2053 define_dev_printk_level(dev_alert
, KERN_ALERT
);
2054 define_dev_printk_level(dev_crit
, KERN_CRIT
);
2055 define_dev_printk_level(dev_err
, KERN_ERR
);
2056 define_dev_printk_level(dev_warn
, KERN_WARNING
);
2057 define_dev_printk_level(dev_notice
, KERN_NOTICE
);
2058 define_dev_printk_level(_dev_info
, KERN_INFO
);