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(obj) container_of(obj, struct device, kobj)
89 #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
91 static ssize_t
dev_attr_show(struct kobject
*kobj
, struct attribute
*attr
,
94 struct device_attribute
*dev_attr
= to_dev_attr(attr
);
95 struct device
*dev
= to_dev(kobj
);
99 ret
= dev_attr
->show(dev
, dev_attr
, buf
);
100 if (ret
>= (ssize_t
)PAGE_SIZE
) {
101 print_symbol("dev_attr_show: %s returned bad count\n",
102 (unsigned long)dev_attr
->show
);
107 static ssize_t
dev_attr_store(struct kobject
*kobj
, struct attribute
*attr
,
108 const char *buf
, size_t count
)
110 struct device_attribute
*dev_attr
= to_dev_attr(attr
);
111 struct device
*dev
= to_dev(kobj
);
115 ret
= dev_attr
->store(dev
, dev_attr
, buf
, count
);
119 static const struct sysfs_ops dev_sysfs_ops
= {
120 .show
= dev_attr_show
,
121 .store
= dev_attr_store
,
124 #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr)
126 ssize_t
device_store_ulong(struct device
*dev
,
127 struct device_attribute
*attr
,
128 const char *buf
, size_t size
)
130 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
132 unsigned long new = simple_strtoul(buf
, &end
, 0);
135 *(unsigned long *)(ea
->var
) = new;
136 /* Always return full write size even if we didn't consume all */
139 EXPORT_SYMBOL_GPL(device_store_ulong
);
141 ssize_t
device_show_ulong(struct device
*dev
,
142 struct device_attribute
*attr
,
145 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
146 return snprintf(buf
, PAGE_SIZE
, "%lx\n", *(unsigned long *)(ea
->var
));
148 EXPORT_SYMBOL_GPL(device_show_ulong
);
150 ssize_t
device_store_int(struct device
*dev
,
151 struct device_attribute
*attr
,
152 const char *buf
, size_t size
)
154 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
156 long new = simple_strtol(buf
, &end
, 0);
157 if (end
== buf
|| new > INT_MAX
|| new < INT_MIN
)
159 *(int *)(ea
->var
) = new;
160 /* Always return full write size even if we didn't consume all */
163 EXPORT_SYMBOL_GPL(device_store_int
);
165 ssize_t
device_show_int(struct device
*dev
,
166 struct device_attribute
*attr
,
169 struct dev_ext_attribute
*ea
= to_ext_attr(attr
);
171 return snprintf(buf
, PAGE_SIZE
, "%d\n", *(int *)(ea
->var
));
173 EXPORT_SYMBOL_GPL(device_show_int
);
176 * device_release - free device structure.
177 * @kobj: device's kobject.
179 * This is called once the reference count for the object
180 * reaches 0. We forward the call to the device's release
181 * method, which should handle actually freeing the structure.
183 static void device_release(struct kobject
*kobj
)
185 struct device
*dev
= to_dev(kobj
);
186 struct device_private
*p
= dev
->p
;
190 else if (dev
->type
&& dev
->type
->release
)
191 dev
->type
->release(dev
);
192 else if (dev
->class && dev
->class->dev_release
)
193 dev
->class->dev_release(dev
);
195 WARN(1, KERN_ERR
"Device '%s' does not have a release() "
196 "function, it is broken and must be fixed.\n",
201 static const void *device_namespace(struct kobject
*kobj
)
203 struct device
*dev
= to_dev(kobj
);
204 const void *ns
= NULL
;
206 if (dev
->class && dev
->class->ns_type
)
207 ns
= dev
->class->namespace(dev
);
212 static struct kobj_type device_ktype
= {
213 .release
= device_release
,
214 .sysfs_ops
= &dev_sysfs_ops
,
215 .namespace = device_namespace
,
219 static int dev_uevent_filter(struct kset
*kset
, struct kobject
*kobj
)
221 struct kobj_type
*ktype
= get_ktype(kobj
);
223 if (ktype
== &device_ktype
) {
224 struct device
*dev
= to_dev(kobj
);
233 static const char *dev_uevent_name(struct kset
*kset
, struct kobject
*kobj
)
235 struct device
*dev
= to_dev(kobj
);
238 return dev
->bus
->name
;
240 return dev
->class->name
;
244 static int dev_uevent(struct kset
*kset
, struct kobject
*kobj
,
245 struct kobj_uevent_env
*env
)
247 struct device
*dev
= to_dev(kobj
);
250 /* add device node properties if present */
251 if (MAJOR(dev
->devt
)) {
256 add_uevent_var(env
, "MAJOR=%u", MAJOR(dev
->devt
));
257 add_uevent_var(env
, "MINOR=%u", MINOR(dev
->devt
));
258 name
= device_get_devnode(dev
, &mode
, &tmp
);
260 add_uevent_var(env
, "DEVNAME=%s", name
);
263 add_uevent_var(env
, "DEVMODE=%#o", mode
& 0777);
267 if (dev
->type
&& dev
->type
->name
)
268 add_uevent_var(env
, "DEVTYPE=%s", dev
->type
->name
);
271 add_uevent_var(env
, "DRIVER=%s", dev
->driver
->name
);
273 /* Add common DT information about the device */
274 of_device_uevent(dev
, env
);
276 /* have the bus specific function add its stuff */
277 if (dev
->bus
&& dev
->bus
->uevent
) {
278 retval
= dev
->bus
->uevent(dev
, env
);
280 pr_debug("device: '%s': %s: bus uevent() returned %d\n",
281 dev_name(dev
), __func__
, retval
);
284 /* have the class specific function add its stuff */
285 if (dev
->class && dev
->class->dev_uevent
) {
286 retval
= dev
->class->dev_uevent(dev
, env
);
288 pr_debug("device: '%s': %s: class uevent() "
289 "returned %d\n", dev_name(dev
),
293 /* have the device type specific function add its stuff */
294 if (dev
->type
&& dev
->type
->uevent
) {
295 retval
= dev
->type
->uevent(dev
, env
);
297 pr_debug("device: '%s': %s: dev_type uevent() "
298 "returned %d\n", dev_name(dev
),
305 static const struct kset_uevent_ops device_uevent_ops
= {
306 .filter
= dev_uevent_filter
,
307 .name
= dev_uevent_name
,
308 .uevent
= dev_uevent
,
311 static ssize_t
show_uevent(struct device
*dev
, struct device_attribute
*attr
,
314 struct kobject
*top_kobj
;
316 struct kobj_uevent_env
*env
= NULL
;
321 /* search the kset, the device belongs to */
322 top_kobj
= &dev
->kobj
;
323 while (!top_kobj
->kset
&& top_kobj
->parent
)
324 top_kobj
= top_kobj
->parent
;
328 kset
= top_kobj
->kset
;
329 if (!kset
->uevent_ops
|| !kset
->uevent_ops
->uevent
)
333 if (kset
->uevent_ops
&& kset
->uevent_ops
->filter
)
334 if (!kset
->uevent_ops
->filter(kset
, &dev
->kobj
))
337 env
= kzalloc(sizeof(struct kobj_uevent_env
), GFP_KERNEL
);
341 /* let the kset specific function add its keys */
342 retval
= kset
->uevent_ops
->uevent(kset
, &dev
->kobj
, env
);
346 /* copy keys to file */
347 for (i
= 0; i
< env
->envp_idx
; i
++)
348 count
+= sprintf(&buf
[count
], "%s\n", env
->envp
[i
]);
354 static ssize_t
store_uevent(struct device
*dev
, struct device_attribute
*attr
,
355 const char *buf
, size_t count
)
357 enum kobject_action action
;
359 if (kobject_action_type(buf
, count
, &action
) == 0)
360 kobject_uevent(&dev
->kobj
, action
);
362 dev_err(dev
, "uevent: unknown action-string\n");
366 static struct device_attribute uevent_attr
=
367 __ATTR(uevent
, S_IRUGO
| S_IWUSR
, show_uevent
, store_uevent
);
369 static int device_add_attributes(struct device
*dev
,
370 struct device_attribute
*attrs
)
376 for (i
= 0; attr_name(attrs
[i
]); i
++) {
377 error
= device_create_file(dev
, &attrs
[i
]);
383 device_remove_file(dev
, &attrs
[i
]);
388 static void device_remove_attributes(struct device
*dev
,
389 struct device_attribute
*attrs
)
394 for (i
= 0; attr_name(attrs
[i
]); i
++)
395 device_remove_file(dev
, &attrs
[i
]);
398 static int device_add_bin_attributes(struct device
*dev
,
399 struct bin_attribute
*attrs
)
405 for (i
= 0; attr_name(attrs
[i
]); i
++) {
406 error
= device_create_bin_file(dev
, &attrs
[i
]);
412 device_remove_bin_file(dev
, &attrs
[i
]);
417 static void device_remove_bin_attributes(struct device
*dev
,
418 struct bin_attribute
*attrs
)
423 for (i
= 0; attr_name(attrs
[i
]); i
++)
424 device_remove_bin_file(dev
, &attrs
[i
]);
427 static int device_add_groups(struct device
*dev
,
428 const struct attribute_group
**groups
)
434 for (i
= 0; groups
[i
]; i
++) {
435 error
= sysfs_create_group(&dev
->kobj
, groups
[i
]);
438 sysfs_remove_group(&dev
->kobj
,
447 static void device_remove_groups(struct device
*dev
,
448 const struct attribute_group
**groups
)
453 for (i
= 0; groups
[i
]; i
++)
454 sysfs_remove_group(&dev
->kobj
, groups
[i
]);
457 static int device_add_attrs(struct device
*dev
)
459 struct class *class = dev
->class;
460 const struct device_type
*type
= dev
->type
;
464 error
= device_add_attributes(dev
, class->dev_attrs
);
467 error
= device_add_bin_attributes(dev
, class->dev_bin_attrs
);
469 goto err_remove_class_attrs
;
473 error
= device_add_groups(dev
, type
->groups
);
475 goto err_remove_class_bin_attrs
;
478 error
= device_add_groups(dev
, dev
->groups
);
480 goto err_remove_type_groups
;
484 err_remove_type_groups
:
486 device_remove_groups(dev
, type
->groups
);
487 err_remove_class_bin_attrs
:
489 device_remove_bin_attributes(dev
, class->dev_bin_attrs
);
490 err_remove_class_attrs
:
492 device_remove_attributes(dev
, class->dev_attrs
);
497 static void device_remove_attrs(struct device
*dev
)
499 struct class *class = dev
->class;
500 const struct device_type
*type
= dev
->type
;
502 device_remove_groups(dev
, dev
->groups
);
505 device_remove_groups(dev
, type
->groups
);
508 device_remove_attributes(dev
, class->dev_attrs
);
509 device_remove_bin_attributes(dev
, class->dev_bin_attrs
);
514 static ssize_t
show_dev(struct device
*dev
, struct device_attribute
*attr
,
517 return print_dev_t(buf
, dev
->devt
);
520 static struct device_attribute devt_attr
=
521 __ATTR(dev
, S_IRUGO
, show_dev
, NULL
);
524 struct kset
*devices_kset
;
527 * device_create_file - create sysfs attribute file for device.
529 * @attr: device attribute descriptor.
531 int device_create_file(struct device
*dev
,
532 const struct device_attribute
*attr
)
536 error
= sysfs_create_file(&dev
->kobj
, &attr
->attr
);
541 * device_remove_file - remove sysfs attribute file.
543 * @attr: device attribute descriptor.
545 void device_remove_file(struct device
*dev
,
546 const struct device_attribute
*attr
)
549 sysfs_remove_file(&dev
->kobj
, &attr
->attr
);
553 * device_create_bin_file - create sysfs binary attribute file for device.
555 * @attr: device binary attribute descriptor.
557 int device_create_bin_file(struct device
*dev
,
558 const struct bin_attribute
*attr
)
562 error
= sysfs_create_bin_file(&dev
->kobj
, attr
);
565 EXPORT_SYMBOL_GPL(device_create_bin_file
);
568 * device_remove_bin_file - remove sysfs binary attribute file
570 * @attr: device binary attribute descriptor.
572 void device_remove_bin_file(struct device
*dev
,
573 const struct bin_attribute
*attr
)
576 sysfs_remove_bin_file(&dev
->kobj
, attr
);
578 EXPORT_SYMBOL_GPL(device_remove_bin_file
);
581 * device_schedule_callback_owner - helper to schedule a callback for a device
583 * @func: callback function to invoke later.
584 * @owner: module owning the callback routine
586 * Attribute methods must not unregister themselves or their parent device
587 * (which would amount to the same thing). Attempts to do so will deadlock,
588 * since unregistration is mutually exclusive with driver callbacks.
590 * Instead methods can call this routine, which will attempt to allocate
591 * and schedule a workqueue request to call back @func with @dev as its
592 * argument in the workqueue's process context. @dev will be pinned until
595 * This routine is usually called via the inline device_schedule_callback(),
596 * which automatically sets @owner to THIS_MODULE.
598 * Returns 0 if the request was submitted, -ENOMEM if storage could not
599 * be allocated, -ENODEV if a reference to @owner isn't available.
601 * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
602 * underlying sysfs routine (since it is intended for use by attribute
603 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
605 int device_schedule_callback_owner(struct device
*dev
,
606 void (*func
)(struct device
*), struct module
*owner
)
608 return sysfs_schedule_callback(&dev
->kobj
,
609 (void (*)(void *)) func
, dev
, owner
);
611 EXPORT_SYMBOL_GPL(device_schedule_callback_owner
);
613 static void klist_children_get(struct klist_node
*n
)
615 struct device_private
*p
= to_device_private_parent(n
);
616 struct device
*dev
= p
->device
;
621 static void klist_children_put(struct klist_node
*n
)
623 struct device_private
*p
= to_device_private_parent(n
);
624 struct device
*dev
= p
->device
;
630 * device_initialize - init device structure.
633 * This prepares the device for use by other layers by initializing
635 * It is the first half of device_register(), if called by
636 * that function, though it can also be called separately, so one
637 * may use @dev's fields. In particular, get_device()/put_device()
638 * may be used for reference counting of @dev after calling this
641 * All fields in @dev must be initialized by the caller to 0, except
642 * for those explicitly set to some other value. The simplest
643 * approach is to use kzalloc() to allocate the structure containing
646 * NOTE: Use put_device() to give up your reference instead of freeing
647 * @dev directly once you have called this function.
649 void device_initialize(struct device
*dev
)
651 dev
->kobj
.kset
= devices_kset
;
652 kobject_init(&dev
->kobj
, &device_ktype
);
653 INIT_LIST_HEAD(&dev
->dma_pools
);
654 mutex_init(&dev
->mutex
);
655 lockdep_set_novalidate_class(&dev
->mutex
);
656 spin_lock_init(&dev
->devres_lock
);
657 INIT_LIST_HEAD(&dev
->devres_head
);
659 set_dev_node(dev
, -1);
662 static struct kobject
*virtual_device_parent(struct device
*dev
)
664 static struct kobject
*virtual_dir
= NULL
;
667 virtual_dir
= kobject_create_and_add("virtual",
668 &devices_kset
->kobj
);
678 #define to_class_dir(obj) container_of(obj, struct class_dir, kobj)
680 static void class_dir_release(struct kobject
*kobj
)
682 struct class_dir
*dir
= to_class_dir(kobj
);
687 struct kobj_ns_type_operations
*class_dir_child_ns_type(struct kobject
*kobj
)
689 struct class_dir
*dir
= to_class_dir(kobj
);
690 return dir
->class->ns_type
;
693 static struct kobj_type class_dir_ktype
= {
694 .release
= class_dir_release
,
695 .sysfs_ops
= &kobj_sysfs_ops
,
696 .child_ns_type
= class_dir_child_ns_type
699 static struct kobject
*
700 class_dir_create_and_add(struct class *class, struct kobject
*parent_kobj
)
702 struct class_dir
*dir
;
705 dir
= kzalloc(sizeof(*dir
), GFP_KERNEL
);
710 kobject_init(&dir
->kobj
, &class_dir_ktype
);
712 dir
->kobj
.kset
= &class->p
->glue_dirs
;
714 retval
= kobject_add(&dir
->kobj
, parent_kobj
, "%s", class->name
);
716 kobject_put(&dir
->kobj
);
723 static struct kobject
*get_device_parent(struct device
*dev
,
724 struct device
*parent
)
727 static DEFINE_MUTEX(gdp_mutex
);
728 struct kobject
*kobj
= NULL
;
729 struct kobject
*parent_kobj
;
733 /* block disks show up in /sys/block */
734 if (sysfs_deprecated
&& dev
->class == &block_class
) {
735 if (parent
&& parent
->class == &block_class
)
736 return &parent
->kobj
;
737 return &block_class
.p
->subsys
.kobj
;
742 * If we have no parent, we live in "virtual".
743 * Class-devices with a non class-device as parent, live
744 * in a "glue" directory to prevent namespace collisions.
747 parent_kobj
= virtual_device_parent(dev
);
748 else if (parent
->class && !dev
->class->ns_type
)
749 return &parent
->kobj
;
751 parent_kobj
= &parent
->kobj
;
753 mutex_lock(&gdp_mutex
);
755 /* find our class-directory at the parent and reference it */
756 spin_lock(&dev
->class->p
->glue_dirs
.list_lock
);
757 list_for_each_entry(k
, &dev
->class->p
->glue_dirs
.list
, entry
)
758 if (k
->parent
== parent_kobj
) {
759 kobj
= kobject_get(k
);
762 spin_unlock(&dev
->class->p
->glue_dirs
.list_lock
);
764 mutex_unlock(&gdp_mutex
);
768 /* or create a new class-directory at the parent device */
769 k
= class_dir_create_and_add(dev
->class, parent_kobj
);
770 /* do not emit an uevent for this simple "glue" directory */
771 mutex_unlock(&gdp_mutex
);
775 /* subsystems can specify a default root directory for their devices */
776 if (!parent
&& dev
->bus
&& dev
->bus
->dev_root
)
777 return &dev
->bus
->dev_root
->kobj
;
780 return &parent
->kobj
;
784 static void cleanup_glue_dir(struct device
*dev
, struct kobject
*glue_dir
)
786 /* see if we live in a "glue" directory */
787 if (!glue_dir
|| !dev
->class ||
788 glue_dir
->kset
!= &dev
->class->p
->glue_dirs
)
791 kobject_put(glue_dir
);
794 static void cleanup_device_parent(struct device
*dev
)
796 cleanup_glue_dir(dev
, dev
->kobj
.parent
);
799 static int device_add_class_symlinks(struct device
*dev
)
806 error
= sysfs_create_link(&dev
->kobj
,
807 &dev
->class->p
->subsys
.kobj
,
812 if (dev
->parent
&& device_is_not_partition(dev
)) {
813 error
= sysfs_create_link(&dev
->kobj
, &dev
->parent
->kobj
,
820 /* /sys/block has directories and does not need symlinks */
821 if (sysfs_deprecated
&& dev
->class == &block_class
)
825 /* link in the class directory pointing to the device */
826 error
= sysfs_create_link(&dev
->class->p
->subsys
.kobj
,
827 &dev
->kobj
, dev_name(dev
));
834 sysfs_remove_link(&dev
->kobj
, "device");
837 sysfs_remove_link(&dev
->kobj
, "subsystem");
842 static void device_remove_class_symlinks(struct device
*dev
)
847 if (dev
->parent
&& device_is_not_partition(dev
))
848 sysfs_remove_link(&dev
->kobj
, "device");
849 sysfs_remove_link(&dev
->kobj
, "subsystem");
851 if (sysfs_deprecated
&& dev
->class == &block_class
)
854 sysfs_delete_link(&dev
->class->p
->subsys
.kobj
, &dev
->kobj
, dev_name(dev
));
858 * dev_set_name - set a device name
860 * @fmt: format string for the device's name
862 int dev_set_name(struct device
*dev
, const char *fmt
, ...)
867 va_start(vargs
, fmt
);
868 err
= kobject_set_name_vargs(&dev
->kobj
, fmt
, vargs
);
872 EXPORT_SYMBOL_GPL(dev_set_name
);
875 * device_to_dev_kobj - select a /sys/dev/ directory for the device
878 * By default we select char/ for new entries. Setting class->dev_obj
879 * to NULL prevents an entry from being created. class->dev_kobj must
880 * be set (or cleared) before any devices are registered to the class
881 * otherwise device_create_sys_dev_entry() and
882 * device_remove_sys_dev_entry() will disagree about the presence of
885 static struct kobject
*device_to_dev_kobj(struct device
*dev
)
887 struct kobject
*kobj
;
890 kobj
= dev
->class->dev_kobj
;
892 kobj
= sysfs_dev_char_kobj
;
897 static int device_create_sys_dev_entry(struct device
*dev
)
899 struct kobject
*kobj
= device_to_dev_kobj(dev
);
904 format_dev_t(devt_str
, dev
->devt
);
905 error
= sysfs_create_link(kobj
, &dev
->kobj
, devt_str
);
911 static void device_remove_sys_dev_entry(struct device
*dev
)
913 struct kobject
*kobj
= device_to_dev_kobj(dev
);
917 format_dev_t(devt_str
, dev
->devt
);
918 sysfs_remove_link(kobj
, devt_str
);
922 int device_private_init(struct device
*dev
)
924 dev
->p
= kzalloc(sizeof(*dev
->p
), GFP_KERNEL
);
927 dev
->p
->device
= dev
;
928 klist_init(&dev
->p
->klist_children
, klist_children_get
,
930 INIT_LIST_HEAD(&dev
->p
->deferred_probe
);
935 * device_add - add device to device hierarchy.
938 * This is part 2 of device_register(), though may be called
939 * separately _iff_ device_initialize() has been called separately.
941 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
942 * to the global and sibling lists for the device, then
943 * adds it to the other relevant subsystems of the driver model.
945 * Do not call this routine or device_register() more than once for
946 * any device structure. The driver model core is not designed to work
947 * with devices that get unregistered and then spring back to life.
948 * (Among other things, it's very hard to guarantee that all references
949 * to the previous incarnation of @dev have been dropped.) Allocate
950 * and register a fresh new struct device instead.
952 * NOTE: _Never_ directly free @dev after calling this function, even
953 * if it returned an error! Always use put_device() to give up your
956 int device_add(struct device
*dev
)
958 struct device
*parent
= NULL
;
959 struct kobject
*kobj
;
960 struct class_interface
*class_intf
;
963 dev
= get_device(dev
);
968 error
= device_private_init(dev
);
974 * for statically allocated devices, which should all be converted
975 * some day, we need to initialize the name. We prevent reading back
976 * the name, and force the use of dev_name()
978 if (dev
->init_name
) {
979 dev_set_name(dev
, "%s", dev
->init_name
);
980 dev
->init_name
= NULL
;
983 /* subsystems can specify simple device enumeration */
984 if (!dev_name(dev
) && dev
->bus
&& dev
->bus
->dev_name
)
985 dev_set_name(dev
, "%s%u", dev
->bus
->dev_name
, dev
->id
);
987 if (!dev_name(dev
)) {
992 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
994 parent
= get_device(dev
->parent
);
995 kobj
= get_device_parent(dev
, parent
);
997 dev
->kobj
.parent
= kobj
;
999 /* use parent numa_node */
1001 set_dev_node(dev
, dev_to_node(parent
));
1003 /* first, register with generic layer. */
1004 /* we require the name to be set before, and pass NULL */
1005 error
= kobject_add(&dev
->kobj
, dev
->kobj
.parent
, NULL
);
1009 /* notify platform of device entry */
1010 if (platform_notify
)
1011 platform_notify(dev
);
1013 error
= device_create_file(dev
, &uevent_attr
);
1017 if (MAJOR(dev
->devt
)) {
1018 error
= device_create_file(dev
, &devt_attr
);
1020 goto ueventattrError
;
1022 error
= device_create_sys_dev_entry(dev
);
1026 devtmpfs_create_node(dev
);
1029 error
= device_add_class_symlinks(dev
);
1032 error
= device_add_attrs(dev
);
1035 error
= bus_add_device(dev
);
1038 error
= dpm_sysfs_add(dev
);
1043 /* Notify clients of device addition. This call must come
1044 * after dpm_sysfs_add() and before kobject_uevent().
1047 blocking_notifier_call_chain(&dev
->bus
->p
->bus_notifier
,
1048 BUS_NOTIFY_ADD_DEVICE
, dev
);
1050 kobject_uevent(&dev
->kobj
, KOBJ_ADD
);
1051 bus_probe_device(dev
);
1053 klist_add_tail(&dev
->p
->knode_parent
,
1054 &parent
->p
->klist_children
);
1057 mutex_lock(&dev
->class->p
->mutex
);
1058 /* tie the class to the device */
1059 klist_add_tail(&dev
->knode_class
,
1060 &dev
->class->p
->klist_devices
);
1062 /* notify any interfaces that the device is here */
1063 list_for_each_entry(class_intf
,
1064 &dev
->class->p
->interfaces
, node
)
1065 if (class_intf
->add_dev
)
1066 class_intf
->add_dev(dev
, class_intf
);
1067 mutex_unlock(&dev
->class->p
->mutex
);
1073 bus_remove_device(dev
);
1075 device_remove_attrs(dev
);
1077 device_remove_class_symlinks(dev
);
1079 if (MAJOR(dev
->devt
))
1080 devtmpfs_delete_node(dev
);
1081 if (MAJOR(dev
->devt
))
1082 device_remove_sys_dev_entry(dev
);
1084 if (MAJOR(dev
->devt
))
1085 device_remove_file(dev
, &devt_attr
);
1087 device_remove_file(dev
, &uevent_attr
);
1089 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
1090 kobject_del(&dev
->kobj
);
1092 cleanup_device_parent(dev
);
1102 * device_register - register a device with the system.
1103 * @dev: pointer to the device structure
1105 * This happens in two clean steps - initialize the device
1106 * and add it to the system. The two steps can be called
1107 * separately, but this is the easiest and most common.
1108 * I.e. you should only call the two helpers separately if
1109 * have a clearly defined need to use and refcount the device
1110 * before it is added to the hierarchy.
1112 * For more information, see the kerneldoc for device_initialize()
1115 * NOTE: _Never_ directly free @dev after calling this function, even
1116 * if it returned an error! Always use put_device() to give up the
1117 * reference initialized in this function instead.
1119 int device_register(struct device
*dev
)
1121 device_initialize(dev
);
1122 return device_add(dev
);
1126 * get_device - increment reference count for device.
1129 * This simply forwards the call to kobject_get(), though
1130 * we do take care to provide for the case that we get a NULL
1131 * pointer passed in.
1133 struct device
*get_device(struct device
*dev
)
1135 return dev
? to_dev(kobject_get(&dev
->kobj
)) : NULL
;
1139 * put_device - decrement reference count.
1140 * @dev: device in question.
1142 void put_device(struct device
*dev
)
1144 /* might_sleep(); */
1146 kobject_put(&dev
->kobj
);
1150 * device_del - delete device from system.
1153 * This is the first part of the device unregistration
1154 * sequence. This removes the device from the lists we control
1155 * from here, has it removed from the other driver model
1156 * subsystems it was added to in device_add(), and removes it
1157 * from the kobject hierarchy.
1159 * NOTE: this should be called manually _iff_ device_add() was
1160 * also called manually.
1162 void device_del(struct device
*dev
)
1164 struct device
*parent
= dev
->parent
;
1165 struct class_interface
*class_intf
;
1167 /* Notify clients of device removal. This call must come
1168 * before dpm_sysfs_remove().
1171 blocking_notifier_call_chain(&dev
->bus
->p
->bus_notifier
,
1172 BUS_NOTIFY_DEL_DEVICE
, dev
);
1173 device_pm_remove(dev
);
1174 dpm_sysfs_remove(dev
);
1176 klist_del(&dev
->p
->knode_parent
);
1177 if (MAJOR(dev
->devt
)) {
1178 devtmpfs_delete_node(dev
);
1179 device_remove_sys_dev_entry(dev
);
1180 device_remove_file(dev
, &devt_attr
);
1183 device_remove_class_symlinks(dev
);
1185 mutex_lock(&dev
->class->p
->mutex
);
1186 /* notify any interfaces that the device is now gone */
1187 list_for_each_entry(class_intf
,
1188 &dev
->class->p
->interfaces
, node
)
1189 if (class_intf
->remove_dev
)
1190 class_intf
->remove_dev(dev
, class_intf
);
1191 /* remove the device from the class list */
1192 klist_del(&dev
->knode_class
);
1193 mutex_unlock(&dev
->class->p
->mutex
);
1195 device_remove_file(dev
, &uevent_attr
);
1196 device_remove_attrs(dev
);
1197 bus_remove_device(dev
);
1198 driver_deferred_probe_del(dev
);
1201 * Some platform devices are driven without driver attached
1202 * and managed resources may have been acquired. Make sure
1203 * all resources are released.
1205 devres_release_all(dev
);
1207 /* Notify the platform of the removal, in case they
1208 * need to do anything...
1210 if (platform_notify_remove
)
1211 platform_notify_remove(dev
);
1212 kobject_uevent(&dev
->kobj
, KOBJ_REMOVE
);
1213 cleanup_device_parent(dev
);
1214 kobject_del(&dev
->kobj
);
1219 * device_unregister - unregister device from system.
1220 * @dev: device going away.
1222 * We do this in two parts, like we do device_register(). First,
1223 * we remove it from all the subsystems with device_del(), then
1224 * we decrement the reference count via put_device(). If that
1225 * is the final reference count, the device will be cleaned up
1226 * via device_release() above. Otherwise, the structure will
1227 * stick around until the final reference to the device is dropped.
1229 void device_unregister(struct device
*dev
)
1231 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1236 static struct device
*next_device(struct klist_iter
*i
)
1238 struct klist_node
*n
= klist_next(i
);
1239 struct device
*dev
= NULL
;
1240 struct device_private
*p
;
1243 p
= to_device_private_parent(n
);
1250 * device_get_devnode - path of device node file
1252 * @mode: returned file access mode
1253 * @tmp: possibly allocated string
1255 * Return the relative path of a possible device node.
1256 * Non-default names may need to allocate a memory to compose
1257 * a name. This memory is returned in tmp and needs to be
1258 * freed by the caller.
1260 const char *device_get_devnode(struct device
*dev
,
1261 umode_t
*mode
, const char **tmp
)
1267 /* the device type may provide a specific name */
1268 if (dev
->type
&& dev
->type
->devnode
)
1269 *tmp
= dev
->type
->devnode(dev
, mode
);
1273 /* the class may provide a specific name */
1274 if (dev
->class && dev
->class->devnode
)
1275 *tmp
= dev
->class->devnode(dev
, mode
);
1279 /* return name without allocation, tmp == NULL */
1280 if (strchr(dev_name(dev
), '!') == NULL
)
1281 return dev_name(dev
);
1283 /* replace '!' in the name with '/' */
1284 *tmp
= kstrdup(dev_name(dev
), GFP_KERNEL
);
1287 while ((s
= strchr(*tmp
, '!')))
1293 * device_for_each_child - device child iterator.
1294 * @parent: parent struct device.
1295 * @data: data for the callback.
1296 * @fn: function to be called for each device.
1298 * Iterate over @parent's child devices, and call @fn for each,
1301 * We check the return of @fn each time. If it returns anything
1302 * other than 0, we break out and return that value.
1304 int device_for_each_child(struct device
*parent
, void *data
,
1305 int (*fn
)(struct device
*dev
, void *data
))
1307 struct klist_iter i
;
1308 struct device
*child
;
1314 klist_iter_init(&parent
->p
->klist_children
, &i
);
1315 while ((child
= next_device(&i
)) && !error
)
1316 error
= fn(child
, data
);
1317 klist_iter_exit(&i
);
1322 * device_find_child - device iterator for locating a particular device.
1323 * @parent: parent struct device
1324 * @data: Data to pass to match function
1325 * @match: Callback function to check device
1327 * This is similar to the device_for_each_child() function above, but it
1328 * returns a reference to a device that is 'found' for later use, as
1329 * determined by the @match callback.
1331 * The callback should return 0 if the device doesn't match and non-zero
1332 * if it does. If the callback returns non-zero and a reference to the
1333 * current device can be obtained, this function will return to the caller
1334 * and not iterate over any more devices.
1336 struct device
*device_find_child(struct device
*parent
, void *data
,
1337 int (*match
)(struct device
*dev
, void *data
))
1339 struct klist_iter i
;
1340 struct device
*child
;
1345 klist_iter_init(&parent
->p
->klist_children
, &i
);
1346 while ((child
= next_device(&i
)))
1347 if (match(child
, data
) && get_device(child
))
1349 klist_iter_exit(&i
);
1353 int __init
devices_init(void)
1355 devices_kset
= kset_create_and_add("devices", &device_uevent_ops
, NULL
);
1358 dev_kobj
= kobject_create_and_add("dev", NULL
);
1361 sysfs_dev_block_kobj
= kobject_create_and_add("block", dev_kobj
);
1362 if (!sysfs_dev_block_kobj
)
1363 goto block_kobj_err
;
1364 sysfs_dev_char_kobj
= kobject_create_and_add("char", dev_kobj
);
1365 if (!sysfs_dev_char_kobj
)
1371 kobject_put(sysfs_dev_block_kobj
);
1373 kobject_put(dev_kobj
);
1375 kset_unregister(devices_kset
);
1379 EXPORT_SYMBOL_GPL(device_for_each_child
);
1380 EXPORT_SYMBOL_GPL(device_find_child
);
1382 EXPORT_SYMBOL_GPL(device_initialize
);
1383 EXPORT_SYMBOL_GPL(device_add
);
1384 EXPORT_SYMBOL_GPL(device_register
);
1386 EXPORT_SYMBOL_GPL(device_del
);
1387 EXPORT_SYMBOL_GPL(device_unregister
);
1388 EXPORT_SYMBOL_GPL(get_device
);
1389 EXPORT_SYMBOL_GPL(put_device
);
1391 EXPORT_SYMBOL_GPL(device_create_file
);
1392 EXPORT_SYMBOL_GPL(device_remove_file
);
1394 struct root_device
{
1396 struct module
*owner
;
1399 inline struct root_device
*to_root_device(struct device
*d
)
1401 return container_of(d
, struct root_device
, dev
);
1404 static void root_device_release(struct device
*dev
)
1406 kfree(to_root_device(dev
));
1410 * __root_device_register - allocate and register a root device
1411 * @name: root device name
1412 * @owner: owner module of the root device, usually THIS_MODULE
1414 * This function allocates a root device and registers it
1415 * using device_register(). In order to free the returned
1416 * device, use root_device_unregister().
1418 * Root devices are dummy devices which allow other devices
1419 * to be grouped under /sys/devices. Use this function to
1420 * allocate a root device and then use it as the parent of
1421 * any device which should appear under /sys/devices/{name}
1423 * The /sys/devices/{name} directory will also contain a
1424 * 'module' symlink which points to the @owner directory
1427 * Returns &struct device pointer on success, or ERR_PTR() on error.
1429 * Note: You probably want to use root_device_register().
1431 struct device
*__root_device_register(const char *name
, struct module
*owner
)
1433 struct root_device
*root
;
1436 root
= kzalloc(sizeof(struct root_device
), GFP_KERNEL
);
1438 return ERR_PTR(err
);
1440 err
= dev_set_name(&root
->dev
, "%s", name
);
1443 return ERR_PTR(err
);
1446 root
->dev
.release
= root_device_release
;
1448 err
= device_register(&root
->dev
);
1450 put_device(&root
->dev
);
1451 return ERR_PTR(err
);
1454 #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */
1456 struct module_kobject
*mk
= &owner
->mkobj
;
1458 err
= sysfs_create_link(&root
->dev
.kobj
, &mk
->kobj
, "module");
1460 device_unregister(&root
->dev
);
1461 return ERR_PTR(err
);
1463 root
->owner
= owner
;
1469 EXPORT_SYMBOL_GPL(__root_device_register
);
1472 * root_device_unregister - unregister and free a root device
1473 * @dev: device going away
1475 * This function unregisters and cleans up a device that was created by
1476 * root_device_register().
1478 void root_device_unregister(struct device
*dev
)
1480 struct root_device
*root
= to_root_device(dev
);
1483 sysfs_remove_link(&root
->dev
.kobj
, "module");
1485 device_unregister(dev
);
1487 EXPORT_SYMBOL_GPL(root_device_unregister
);
1490 static void device_create_release(struct device
*dev
)
1492 pr_debug("device: '%s': %s\n", dev_name(dev
), __func__
);
1497 * device_create_vargs - creates a device and registers it with sysfs
1498 * @class: pointer to the struct class that this device should be registered to
1499 * @parent: pointer to the parent struct device of this new device, if any
1500 * @devt: the dev_t for the char device to be added
1501 * @drvdata: the data to be added to the device for callbacks
1502 * @fmt: string for the device's name
1503 * @args: va_list for the device's name
1505 * This function can be used by char device classes. A struct device
1506 * will be created in sysfs, registered to the specified class.
1508 * A "dev" file will be created, showing the dev_t for the device, if
1509 * the dev_t is not 0,0.
1510 * If a pointer to a parent struct device is passed in, the newly created
1511 * struct device will be a child of that device in sysfs.
1512 * The pointer to the struct device will be returned from the call.
1513 * Any further sysfs files that might be required can be created using this
1516 * Returns &struct device pointer on success, or ERR_PTR() on error.
1518 * Note: the struct class passed to this function must have previously
1519 * been created with a call to class_create().
1521 struct device
*device_create_vargs(struct class *class, struct device
*parent
,
1522 dev_t devt
, void *drvdata
, const char *fmt
,
1525 struct device
*dev
= NULL
;
1526 int retval
= -ENODEV
;
1528 if (class == NULL
|| IS_ERR(class))
1531 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
1539 dev
->parent
= parent
;
1540 dev
->release
= device_create_release
;
1541 dev_set_drvdata(dev
, drvdata
);
1543 retval
= kobject_set_name_vargs(&dev
->kobj
, fmt
, args
);
1547 retval
= device_register(dev
);
1555 return ERR_PTR(retval
);
1557 EXPORT_SYMBOL_GPL(device_create_vargs
);
1560 * device_create - creates a device and registers it with sysfs
1561 * @class: pointer to the struct class that this device should be registered to
1562 * @parent: pointer to the parent struct device of this new device, if any
1563 * @devt: the dev_t for the char device to be added
1564 * @drvdata: the data to be added to the device for callbacks
1565 * @fmt: string 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(struct class *class, struct device
*parent
,
1584 dev_t devt
, void *drvdata
, const char *fmt
, ...)
1589 va_start(vargs
, fmt
);
1590 dev
= device_create_vargs(class, parent
, devt
, drvdata
, fmt
, vargs
);
1594 EXPORT_SYMBOL_GPL(device_create
);
1596 static int __match_devt(struct device
*dev
, void *data
)
1600 return dev
->devt
== *devt
;
1604 * device_destroy - removes a device that was created with device_create()
1605 * @class: pointer to the struct class that this device was registered with
1606 * @devt: the dev_t of the device that was previously registered
1608 * This call unregisters and cleans up a device that was created with a
1609 * call to device_create().
1611 void device_destroy(struct class *class, dev_t devt
)
1615 dev
= class_find_device(class, NULL
, &devt
, __match_devt
);
1618 device_unregister(dev
);
1621 EXPORT_SYMBOL_GPL(device_destroy
);
1624 * device_rename - renames a device
1625 * @dev: the pointer to the struct device to be renamed
1626 * @new_name: the new name of the device
1628 * It is the responsibility of the caller to provide mutual
1629 * exclusion between two different calls of device_rename
1630 * on the same device to ensure that new_name is valid and
1631 * won't conflict with other devices.
1633 * Note: Don't call this function. Currently, the networking layer calls this
1634 * function, but that will change. The following text from Kay Sievers offers
1637 * Renaming devices is racy at many levels, symlinks and other stuff are not
1638 * replaced atomically, and you get a "move" uevent, but it's not easy to
1639 * connect the event to the old and new device. Device nodes are not renamed at
1640 * all, there isn't even support for that in the kernel now.
1642 * In the meantime, during renaming, your target name might be taken by another
1643 * driver, creating conflicts. Or the old name is taken directly after you
1644 * renamed it -- then you get events for the same DEVPATH, before you even see
1645 * the "move" event. It's just a mess, and nothing new should ever rely on
1646 * kernel device renaming. Besides that, it's not even implemented now for
1647 * other things than (driver-core wise very simple) network devices.
1649 * We are currently about to change network renaming in udev to completely
1650 * disallow renaming of devices in the same namespace as the kernel uses,
1651 * because we can't solve the problems properly, that arise with swapping names
1652 * of multiple interfaces without races. Means, renaming of eth[0-9]* will only
1653 * be allowed to some other name than eth[0-9]*, for the aforementioned
1656 * Make up a "real" name in the driver before you register anything, or add
1657 * some other attributes for userspace to find the device, or use udev to add
1658 * symlinks -- but never rename kernel devices later, it's a complete mess. We
1659 * don't even want to get into that and try to implement the missing pieces in
1660 * the core. We really have other pieces to fix in the driver core mess. :)
1662 int device_rename(struct device
*dev
, const char *new_name
)
1664 char *old_class_name
= NULL
;
1665 char *new_class_name
= NULL
;
1666 char *old_device_name
= NULL
;
1669 dev
= get_device(dev
);
1673 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev
),
1674 __func__
, new_name
);
1676 old_device_name
= kstrdup(dev_name(dev
), GFP_KERNEL
);
1677 if (!old_device_name
) {
1683 error
= sysfs_rename_link(&dev
->class->p
->subsys
.kobj
,
1684 &dev
->kobj
, old_device_name
, new_name
);
1689 error
= kobject_rename(&dev
->kobj
, new_name
);
1696 kfree(new_class_name
);
1697 kfree(old_class_name
);
1698 kfree(old_device_name
);
1702 EXPORT_SYMBOL_GPL(device_rename
);
1704 static int device_move_class_links(struct device
*dev
,
1705 struct device
*old_parent
,
1706 struct device
*new_parent
)
1711 sysfs_remove_link(&dev
->kobj
, "device");
1713 error
= sysfs_create_link(&dev
->kobj
, &new_parent
->kobj
,
1719 * device_move - moves a device to a new parent
1720 * @dev: the pointer to the struct device to be moved
1721 * @new_parent: the new parent of the device (can by NULL)
1722 * @dpm_order: how to reorder the dpm_list
1724 int device_move(struct device
*dev
, struct device
*new_parent
,
1725 enum dpm_order dpm_order
)
1728 struct device
*old_parent
;
1729 struct kobject
*new_parent_kobj
;
1731 dev
= get_device(dev
);
1736 new_parent
= get_device(new_parent
);
1737 new_parent_kobj
= get_device_parent(dev
, new_parent
);
1739 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev
),
1740 __func__
, new_parent
? dev_name(new_parent
) : "<NULL>");
1741 error
= kobject_move(&dev
->kobj
, new_parent_kobj
);
1743 cleanup_glue_dir(dev
, new_parent_kobj
);
1744 put_device(new_parent
);
1747 old_parent
= dev
->parent
;
1748 dev
->parent
= new_parent
;
1750 klist_remove(&dev
->p
->knode_parent
);
1752 klist_add_tail(&dev
->p
->knode_parent
,
1753 &new_parent
->p
->klist_children
);
1754 set_dev_node(dev
, dev_to_node(new_parent
));
1759 error
= device_move_class_links(dev
, old_parent
, new_parent
);
1761 /* We ignore errors on cleanup since we're hosed anyway... */
1762 device_move_class_links(dev
, new_parent
, old_parent
);
1763 if (!kobject_move(&dev
->kobj
, &old_parent
->kobj
)) {
1765 klist_remove(&dev
->p
->knode_parent
);
1766 dev
->parent
= old_parent
;
1768 klist_add_tail(&dev
->p
->knode_parent
,
1769 &old_parent
->p
->klist_children
);
1770 set_dev_node(dev
, dev_to_node(old_parent
));
1773 cleanup_glue_dir(dev
, new_parent_kobj
);
1774 put_device(new_parent
);
1777 switch (dpm_order
) {
1778 case DPM_ORDER_NONE
:
1780 case DPM_ORDER_DEV_AFTER_PARENT
:
1781 device_pm_move_after(dev
, new_parent
);
1783 case DPM_ORDER_PARENT_BEFORE_DEV
:
1784 device_pm_move_before(new_parent
, dev
);
1786 case DPM_ORDER_DEV_LAST
:
1787 device_pm_move_last(dev
);
1791 put_device(old_parent
);
1797 EXPORT_SYMBOL_GPL(device_move
);
1800 * device_shutdown - call ->shutdown() on each device to shutdown.
1802 void device_shutdown(void)
1806 spin_lock(&devices_kset
->list_lock
);
1808 * Walk the devices list backward, shutting down each in turn.
1809 * Beware that device unplug events may also start pulling
1810 * devices offline, even as the system is shutting down.
1812 while (!list_empty(&devices_kset
->list
)) {
1813 dev
= list_entry(devices_kset
->list
.prev
, struct device
,
1817 * Make sure the device is off the kset list, in the
1818 * event that dev->*->shutdown() doesn't remove it.
1820 list_del_init(&dev
->kobj
.entry
);
1821 spin_unlock(&devices_kset
->list_lock
);
1823 /* Don't allow any more runtime suspends */
1824 pm_runtime_get_noresume(dev
);
1825 pm_runtime_barrier(dev
);
1827 if (dev
->bus
&& dev
->bus
->shutdown
) {
1828 dev_dbg(dev
, "shutdown\n");
1829 dev
->bus
->shutdown(dev
);
1830 } else if (dev
->driver
&& dev
->driver
->shutdown
) {
1831 dev_dbg(dev
, "shutdown\n");
1832 dev
->driver
->shutdown(dev
);
1836 spin_lock(&devices_kset
->list_lock
);
1838 spin_unlock(&devices_kset
->list_lock
);
1839 async_synchronize_full();
1843 * Device logging functions
1846 #ifdef CONFIG_PRINTK
1847 int __dev_printk(const char *level
, const struct device
*dev
,
1848 struct va_format
*vaf
)
1855 return printk("%s(NULL device *): %pV", level
, vaf
);
1858 subsys
= dev
->class->name
;
1860 subsys
= dev
->bus
->name
;
1864 dictlen
+= snprintf(dict
+ dictlen
, sizeof(dict
) - dictlen
,
1865 "SUBSYSTEM=%s", subsys
);
1868 * Add device identifier DEVICE=:
1872 * +sound:card0 subsystem:devname
1874 if (MAJOR(dev
->devt
)) {
1877 if (strcmp(subsys
, "block") == 0)
1882 dictlen
+= snprintf(dict
+ dictlen
, sizeof(dict
) - dictlen
,
1884 c
, MAJOR(dev
->devt
), MINOR(dev
->devt
));
1885 } else if (strcmp(subsys
, "net") == 0) {
1886 struct net_device
*net
= to_net_dev(dev
);
1889 dictlen
+= snprintf(dict
+ dictlen
, sizeof(dict
) - dictlen
,
1890 "DEVICE=n%u", net
->ifindex
);
1893 dictlen
+= snprintf(dict
+ dictlen
, sizeof(dict
) - dictlen
,
1894 "DEVICE=+%s:%s", subsys
, dev_name(dev
));
1897 return printk_emit(0, level
[1] - '0',
1898 dictlen
? dict
: NULL
, dictlen
,
1900 dev_driver_string(dev
), dev_name(dev
), vaf
);
1902 EXPORT_SYMBOL(__dev_printk
);
1904 int dev_printk(const char *level
, const struct device
*dev
,
1905 const char *fmt
, ...)
1907 struct va_format vaf
;
1911 va_start(args
, fmt
);
1916 r
= __dev_printk(level
, dev
, &vaf
);
1921 EXPORT_SYMBOL(dev_printk
);
1923 #define define_dev_printk_level(func, kern_level) \
1924 int func(const struct device *dev, const char *fmt, ...) \
1926 struct va_format vaf; \
1930 va_start(args, fmt); \
1935 r = __dev_printk(kern_level, dev, &vaf); \
1940 EXPORT_SYMBOL(func);
1942 define_dev_printk_level(dev_emerg
, KERN_EMERG
);
1943 define_dev_printk_level(dev_alert
, KERN_ALERT
);
1944 define_dev_printk_level(dev_crit
, KERN_CRIT
);
1945 define_dev_printk_level(dev_err
, KERN_ERR
);
1946 define_dev_printk_level(dev_warn
, KERN_WARNING
);
1947 define_dev_printk_level(dev_notice
, KERN_NOTICE
);
1948 define_dev_printk_level(_dev_info
, KERN_INFO
);