blob: 7ecb1938e590f34526beaaeda2a3f6683f4024ce [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/base/core.c - core driver model code (device registration, etc)
3 *
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
Greg Kroah-Hartman64bb5d22006-06-28 16:19:58 -07006 * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de>
7 * Copyright (c) 2006 Novell, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * This file is released under the GPLv2
10 *
11 */
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#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>
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -070019#include <linux/kdev_t.h>
Benjamin Herrenschmidt116af372006-10-25 13:44:59 +100020#include <linux/notifier.h>
Kay Sieversda231fd2007-11-21 17:29:15 +010021#include <linux/genhd.h>
Andrew Morton815d2d52008-03-04 15:09:07 -080022#include <linux/kallsyms.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -040023#include <linux/semaphore.h>
Dave Youngf75b1c62008-05-28 09:28:39 -070024#include <linux/mutex.h>
Shaohua Li401097e2009-05-12 13:37:57 -070025#include <linux/async.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27#include "base.h"
28#include "power/power.h"
29
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080030int (*platform_notify)(struct device *dev) = NULL;
31int (*platform_notify_remove)(struct device *dev) = NULL;
Dan Williamse105b8b2008-04-21 10:51:07 -070032static struct kobject *dev_kobj;
33struct kobject *sysfs_dev_char_kobj;
34struct kobject *sysfs_dev_block_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -080036#ifdef CONFIG_BLOCK
37static inline int device_is_not_partition(struct device *dev)
38{
39 return !(dev->type == &part_type);
40}
41#else
42static inline int device_is_not_partition(struct device *dev)
43{
44 return 1;
45}
46#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Alan Stern3e956372006-06-16 17:10:48 -040048/**
49 * dev_driver_string - Return a device's driver name, if at all possible
50 * @dev: struct device to get the name of
51 *
52 * Will return the device's driver's name if it is bound to a device. If
53 * the device is not bound to a device, it will return the name of the bus
54 * it is attached to. If it is not attached to a bus either, an empty
55 * string will be returned.
56 */
Jean Delvarebf9ca692008-07-30 12:29:21 -070057const char *dev_driver_string(const struct device *dev)
Alan Stern3e956372006-06-16 17:10:48 -040058{
59 return dev->driver ? dev->driver->name :
Jean Delvarea456b702007-03-09 16:33:10 +010060 (dev->bus ? dev->bus->name :
61 (dev->class ? dev->class->name : ""));
Alan Stern3e956372006-06-16 17:10:48 -040062}
Matthew Wilcox310a9222006-09-23 23:35:04 -060063EXPORT_SYMBOL(dev_driver_string);
Alan Stern3e956372006-06-16 17:10:48 -040064
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#define to_dev(obj) container_of(obj, struct device, kobj)
66#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
67
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080068static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
69 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080071 struct device_attribute *dev_attr = to_dev_attr(attr);
72 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050073 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75 if (dev_attr->show)
Yani Ioannou54b6f352005-05-17 06:39:34 -040076 ret = dev_attr->show(dev, dev_attr, buf);
Andrew Morton815d2d52008-03-04 15:09:07 -080077 if (ret >= (ssize_t)PAGE_SIZE) {
78 print_symbol("dev_attr_show: %s returned bad count\n",
79 (unsigned long)dev_attr->show);
80 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return ret;
82}
83
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080084static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
85 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080087 struct device_attribute *dev_attr = to_dev_attr(attr);
88 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050089 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 if (dev_attr->store)
Yani Ioannou54b6f352005-05-17 06:39:34 -040092 ret = dev_attr->store(dev, dev_attr, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return ret;
94}
95
96static struct sysfs_ops dev_sysfs_ops = {
97 .show = dev_attr_show,
98 .store = dev_attr_store,
99};
100
101
102/**
103 * device_release - free device structure.
104 * @kobj: device's kobject.
105 *
106 * This is called once the reference count for the object
107 * reaches 0. We forward the call to the device's release
108 * method, which should handle actually freeing the structure.
109 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800110static void device_release(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800112 struct device *dev = to_dev(kobj);
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800113 struct device_private *p = dev->p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115 if (dev->release)
116 dev->release(dev);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200117 else if (dev->type && dev->type->release)
118 dev->type->release(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700119 else if (dev->class && dev->class->dev_release)
120 dev->class->dev_release(dev);
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700121 else
122 WARN(1, KERN_ERR "Device '%s' does not have a release() "
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800123 "function, it is broken and must be fixed.\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100124 dev_name(dev));
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800125 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126}
127
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600128static struct kobj_type device_ktype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 .release = device_release,
130 .sysfs_ops = &dev_sysfs_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131};
132
133
Kay Sievers312c0042005-11-16 09:00:00 +0100134static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 struct kobj_type *ktype = get_ktype(kobj);
137
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600138 if (ktype == &device_ktype) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 struct device *dev = to_dev(kobj);
140 if (dev->bus)
141 return 1;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700142 if (dev->class)
143 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 }
145 return 0;
146}
147
Kay Sievers312c0042005-11-16 09:00:00 +0100148static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 struct device *dev = to_dev(kobj);
151
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700152 if (dev->bus)
153 return dev->bus->name;
154 if (dev->class)
155 return dev->class->name;
156 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
Kay Sievers7eff2e72007-08-14 15:15:12 +0200159static int dev_uevent(struct kset *kset, struct kobject *kobj,
160 struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 struct device *dev = to_dev(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 int retval = 0;
164
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200165 /* add device node properties if present */
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700166 if (MAJOR(dev->devt)) {
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200167 const char *tmp;
168 const char *name;
169
Kay Sievers7eff2e72007-08-14 15:15:12 +0200170 add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
171 add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200172 name = device_get_nodename(dev, &tmp);
173 if (name) {
174 add_uevent_var(env, "DEVNAME=%s", name);
175 kfree(tmp);
176 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700177 }
178
Kay Sievers414264f2007-03-12 21:08:57 +0100179 if (dev->type && dev->type->name)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200180 add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
Kay Sievers414264f2007-03-12 21:08:57 +0100181
Kay Sievers239378f2006-10-07 21:54:55 +0200182 if (dev->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200183 add_uevent_var(env, "DRIVER=%s", dev->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200184
Kay Sieversa87cb2a2006-09-14 11:23:28 +0200185#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sievers239378f2006-10-07 21:54:55 +0200186 if (dev->class) {
187 struct device *parent = dev->parent;
188
189 /* find first bus device in parent chain */
190 while (parent && !parent->bus)
191 parent = parent->parent;
192 if (parent && parent->bus) {
193 const char *path;
194
195 path = kobject_get_path(&parent->kobj, GFP_KERNEL);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200196 if (path) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200197 add_uevent_var(env, "PHYSDEVPATH=%s", path);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200198 kfree(path);
199 }
Kay Sievers239378f2006-10-07 21:54:55 +0200200
Kay Sievers7eff2e72007-08-14 15:15:12 +0200201 add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200202
203 if (parent->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200204 add_uevent_var(env, "PHYSDEVDRIVER=%s",
205 parent->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200206 }
207 } else if (dev->bus) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200208 add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200209
210 if (dev->driver)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800211 add_uevent_var(env, "PHYSDEVDRIVER=%s",
212 dev->driver->name);
Kay Sieversd81d9d62006-08-13 06:17:09 +0200213 }
Kay Sievers239378f2006-10-07 21:54:55 +0200214#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Kay Sievers7eff2e72007-08-14 15:15:12 +0200216 /* have the bus specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100217 if (dev->bus && dev->bus->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200218 retval = dev->bus->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200219 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800220 pr_debug("device: '%s': %s: bus uevent() returned %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100221 dev_name(dev), __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 }
223
Kay Sievers7eff2e72007-08-14 15:15:12 +0200224 /* have the class specific function add its stuff */
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700225 if (dev->class && dev->class->dev_uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200226 retval = dev->class->dev_uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200227 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800228 pr_debug("device: '%s': %s: class uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100229 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800230 __func__, retval);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200231 }
232
Kay Sievers7eff2e72007-08-14 15:15:12 +0200233 /* have the device type specific fuction add its stuff */
Kay Sieversf9f852d2006-10-07 21:54:55 +0200234 if (dev->type && dev->type->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200235 retval = dev->type->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200236 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800237 pr_debug("device: '%s': %s: dev_type uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100238 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800239 __func__, retval);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700240 }
241
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return retval;
243}
244
Kay Sievers312c0042005-11-16 09:00:00 +0100245static struct kset_uevent_ops device_uevent_ops = {
246 .filter = dev_uevent_filter,
247 .name = dev_uevent_name,
248 .uevent = dev_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249};
250
Kay Sievers16574dc2007-04-06 01:40:38 +0200251static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
252 char *buf)
253{
254 struct kobject *top_kobj;
255 struct kset *kset;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200256 struct kobj_uevent_env *env = NULL;
Kay Sievers16574dc2007-04-06 01:40:38 +0200257 int i;
258 size_t count = 0;
259 int retval;
260
261 /* search the kset, the device belongs to */
262 top_kobj = &dev->kobj;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200263 while (!top_kobj->kset && top_kobj->parent)
264 top_kobj = top_kobj->parent;
Kay Sievers16574dc2007-04-06 01:40:38 +0200265 if (!top_kobj->kset)
266 goto out;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200267
Kay Sievers16574dc2007-04-06 01:40:38 +0200268 kset = top_kobj->kset;
269 if (!kset->uevent_ops || !kset->uevent_ops->uevent)
270 goto out;
271
272 /* respect filter */
273 if (kset->uevent_ops && kset->uevent_ops->filter)
274 if (!kset->uevent_ops->filter(kset, &dev->kobj))
275 goto out;
276
Kay Sievers7eff2e72007-08-14 15:15:12 +0200277 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
278 if (!env)
Greg Kroah-Hartmanc7308c82007-05-02 14:14:11 +0200279 return -ENOMEM;
280
Kay Sievers16574dc2007-04-06 01:40:38 +0200281 /* let the kset specific function add its keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200282 retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200283 if (retval)
284 goto out;
285
286 /* copy keys to file */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200287 for (i = 0; i < env->envp_idx; i++)
288 count += sprintf(&buf[count], "%s\n", env->envp[i]);
Kay Sievers16574dc2007-04-06 01:40:38 +0200289out:
Kay Sievers7eff2e72007-08-14 15:15:12 +0200290 kfree(env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200291 return count;
292}
293
Kay Sieversa7fd6702005-10-01 14:49:43 +0200294static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
295 const char *buf, size_t count)
296{
Kay Sievers60a96a52007-07-08 22:29:26 +0200297 enum kobject_action action;
298
Kay Sievers5c5daf62007-08-12 20:43:55 +0200299 if (kobject_action_type(buf, count, &action) == 0) {
Kay Sievers60a96a52007-07-08 22:29:26 +0200300 kobject_uevent(&dev->kobj, action);
301 goto out;
302 }
303
304 dev_err(dev, "uevent: unsupported action-string; this will "
305 "be ignored in a future kernel version\n");
Kay Sievers312c0042005-11-16 09:00:00 +0100306 kobject_uevent(&dev->kobj, KOBJ_ADD);
Kay Sievers60a96a52007-07-08 22:29:26 +0200307out:
Kay Sieversa7fd6702005-10-01 14:49:43 +0200308 return count;
309}
310
Tejun Heoad6a1e12007-06-14 03:45:17 +0900311static struct device_attribute uevent_attr =
312 __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
313
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500314static int device_add_attributes(struct device *dev,
315 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700316{
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700317 int error = 0;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500318 int i;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700319
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500320 if (attrs) {
321 for (i = 0; attr_name(attrs[i]); i++) {
322 error = device_create_file(dev, &attrs[i]);
323 if (error)
324 break;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700325 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500326 if (error)
327 while (--i >= 0)
328 device_remove_file(dev, &attrs[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700329 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700330 return error;
331}
332
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500333static void device_remove_attributes(struct device *dev,
334 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700335{
336 int i;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500337
338 if (attrs)
339 for (i = 0; attr_name(attrs[i]); i++)
340 device_remove_file(dev, &attrs[i]);
341}
342
343static int device_add_groups(struct device *dev,
344 struct attribute_group **groups)
345{
346 int error = 0;
347 int i;
348
349 if (groups) {
350 for (i = 0; groups[i]; i++) {
351 error = sysfs_create_group(&dev->kobj, groups[i]);
352 if (error) {
353 while (--i >= 0)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800354 sysfs_remove_group(&dev->kobj,
355 groups[i]);
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500356 break;
357 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700358 }
359 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500360 return error;
361}
362
363static void device_remove_groups(struct device *dev,
364 struct attribute_group **groups)
365{
366 int i;
367
368 if (groups)
369 for (i = 0; groups[i]; i++)
370 sysfs_remove_group(&dev->kobj, groups[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700371}
372
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700373static int device_add_attrs(struct device *dev)
374{
375 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200376 struct device_type *type = dev->type;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500377 int error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700378
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500379 if (class) {
380 error = device_add_attributes(dev, class->dev_attrs);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200381 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500382 return error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700383 }
Kay Sieversf9f852d2006-10-07 21:54:55 +0200384
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500385 if (type) {
386 error = device_add_groups(dev, type->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200387 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500388 goto err_remove_class_attrs;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200389 }
390
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500391 error = device_add_groups(dev, dev->groups);
392 if (error)
393 goto err_remove_type_groups;
394
395 return 0;
396
397 err_remove_type_groups:
398 if (type)
399 device_remove_groups(dev, type->groups);
400 err_remove_class_attrs:
401 if (class)
402 device_remove_attributes(dev, class->dev_attrs);
403
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700404 return error;
405}
406
407static void device_remove_attrs(struct device *dev)
408{
409 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200410 struct device_type *type = dev->type;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700411
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500412 device_remove_groups(dev, dev->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200413
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500414 if (type)
415 device_remove_groups(dev, type->groups);
416
417 if (class)
418 device_remove_attributes(dev, class->dev_attrs);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700419}
420
421
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700422static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
423 char *buf)
424{
425 return print_dev_t(buf, dev->devt);
426}
427
Tejun Heoad6a1e12007-06-14 03:45:17 +0900428static struct device_attribute devt_attr =
429 __ATTR(dev, S_IRUGO, show_dev, NULL);
430
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -0600431/* kset to create /sys/devices/ */
432struct kset *devices_kset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800435 * device_create_file - create sysfs attribute file for device.
436 * @dev: device.
437 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800439int device_create_file(struct device *dev, struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440{
441 int error = 0;
Cornelia Huck0c98b192008-01-31 10:39:38 +0100442 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 error = sysfs_create_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 return error;
445}
446
447/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800448 * device_remove_file - remove sysfs attribute file.
449 * @dev: device.
450 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800452void device_remove_file(struct device *dev, struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Cornelia Huck0c98b192008-01-31 10:39:38 +0100454 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 sysfs_remove_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456}
457
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700458/**
459 * device_create_bin_file - create sysfs binary attribute file for device.
460 * @dev: device.
461 * @attr: device binary attribute descriptor.
462 */
463int device_create_bin_file(struct device *dev, struct bin_attribute *attr)
464{
465 int error = -EINVAL;
466 if (dev)
467 error = sysfs_create_bin_file(&dev->kobj, attr);
468 return error;
469}
470EXPORT_SYMBOL_GPL(device_create_bin_file);
471
472/**
473 * device_remove_bin_file - remove sysfs binary attribute file
474 * @dev: device.
475 * @attr: device binary attribute descriptor.
476 */
477void device_remove_bin_file(struct device *dev, struct bin_attribute *attr)
478{
479 if (dev)
480 sysfs_remove_bin_file(&dev->kobj, attr);
481}
482EXPORT_SYMBOL_GPL(device_remove_bin_file);
483
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400484/**
Alan Stern523ded72007-04-26 00:12:04 -0700485 * device_schedule_callback_owner - helper to schedule a callback for a device
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400486 * @dev: device.
487 * @func: callback function to invoke later.
Alan Stern523ded72007-04-26 00:12:04 -0700488 * @owner: module owning the callback routine
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400489 *
490 * Attribute methods must not unregister themselves or their parent device
491 * (which would amount to the same thing). Attempts to do so will deadlock,
492 * since unregistration is mutually exclusive with driver callbacks.
493 *
494 * Instead methods can call this routine, which will attempt to allocate
495 * and schedule a workqueue request to call back @func with @dev as its
496 * argument in the workqueue's process context. @dev will be pinned until
497 * @func returns.
498 *
Alan Stern523ded72007-04-26 00:12:04 -0700499 * This routine is usually called via the inline device_schedule_callback(),
500 * which automatically sets @owner to THIS_MODULE.
501 *
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400502 * Returns 0 if the request was submitted, -ENOMEM if storage could not
Alan Stern523ded72007-04-26 00:12:04 -0700503 * be allocated, -ENODEV if a reference to @owner isn't available.
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400504 *
505 * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
506 * underlying sysfs routine (since it is intended for use by attribute
507 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
508 */
Alan Stern523ded72007-04-26 00:12:04 -0700509int device_schedule_callback_owner(struct device *dev,
510 void (*func)(struct device *), struct module *owner)
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400511{
512 return sysfs_schedule_callback(&dev->kobj,
Alan Stern523ded72007-04-26 00:12:04 -0700513 (void (*)(void *)) func, dev, owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400514}
Alan Stern523ded72007-04-26 00:12:04 -0700515EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400516
James Bottomley34bb61f2005-09-06 16:56:51 -0700517static void klist_children_get(struct klist_node *n)
518{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800519 struct device_private *p = to_device_private_parent(n);
520 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700521
522 get_device(dev);
523}
524
525static void klist_children_put(struct klist_node *n)
526{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800527 struct device_private *p = to_device_private_parent(n);
528 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700529
530 put_device(dev);
531}
532
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800534 * device_initialize - init device structure.
535 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 *
Cornelia Huck57394112008-09-03 18:26:40 +0200537 * This prepares the device for use by other layers by initializing
538 * its fields.
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800539 * It is the first half of device_register(), if called by
Cornelia Huck57394112008-09-03 18:26:40 +0200540 * that function, though it can also be called separately, so one
541 * may use @dev's fields. In particular, get_device()/put_device()
542 * may be used for reference counting of @dev after calling this
543 * function.
544 *
545 * NOTE: Use put_device() to give up your reference instead of freeing
546 * @dev directly once you have called this function.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548void device_initialize(struct device *dev)
549{
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -0600550 dev->kobj.kset = devices_kset;
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700551 kobject_init(&dev->kobj, &device_ktype);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 INIT_LIST_HEAD(&dev->dma_pools);
mochel@digitalimplant.orgaf703162005-03-21 10:41:04 -0800553 init_MUTEX(&dev->sem);
Tejun Heo9ac78492007-01-20 16:00:26 +0900554 spin_lock_init(&dev->devres_lock);
555 INIT_LIST_HEAD(&dev->devres_head);
David Brownell0ac85242005-09-12 19:39:34 -0700556 device_init_wakeup(dev, 0);
Alan Stern3b98aea2008-08-07 13:06:12 -0400557 device_pm_init(dev);
Christoph Hellwig87348132006-12-06 20:32:33 -0800558 set_dev_node(dev, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559}
560
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100561#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sieversda231fd2007-11-21 17:29:15 +0100562static struct kobject *get_device_parent(struct device *dev,
563 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100564{
Kay Sieversda231fd2007-11-21 17:29:15 +0100565 /* class devices without a parent live in /sys/class/<classname>/ */
Dmitry Torokhov3eb215d2007-10-07 12:22:21 -0400566 if (dev->class && (!parent || parent->class != dev->class))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700567 return &dev->class->p->class_subsys.kobj;
Kay Sieversda231fd2007-11-21 17:29:15 +0100568 /* all other devices keep their parent */
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100569 else if (parent)
Cornelia Huckc744aea2007-01-08 20:16:44 +0100570 return &parent->kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100571
Cornelia Huckc744aea2007-01-08 20:16:44 +0100572 return NULL;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100573}
Kay Sieversda231fd2007-11-21 17:29:15 +0100574
575static inline void cleanup_device_parent(struct device *dev) {}
Cornelia Huck63b69712008-01-21 16:09:44 +0100576static inline void cleanup_glue_dir(struct device *dev,
577 struct kobject *glue_dir) {}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100578#else
Kay Sievers86406242007-03-14 03:25:56 +0100579static struct kobject *virtual_device_parent(struct device *dev)
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700580{
Kay Sievers86406242007-03-14 03:25:56 +0100581 static struct kobject *virtual_dir = NULL;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700582
Kay Sievers86406242007-03-14 03:25:56 +0100583 if (!virtual_dir)
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -0800584 virtual_dir = kobject_create_and_add("virtual",
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -0600585 &devices_kset->kobj);
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700586
Kay Sievers86406242007-03-14 03:25:56 +0100587 return virtual_dir;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700588}
589
Kay Sieversda231fd2007-11-21 17:29:15 +0100590static struct kobject *get_device_parent(struct device *dev,
591 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100592{
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800593 int retval;
594
Kay Sievers86406242007-03-14 03:25:56 +0100595 if (dev->class) {
596 struct kobject *kobj = NULL;
597 struct kobject *parent_kobj;
598 struct kobject *k;
599
600 /*
601 * If we have no parent, we live in "virtual".
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100602 * Class-devices with a non class-device as parent, live
603 * in a "glue" directory to prevent namespace collisions.
Kay Sievers86406242007-03-14 03:25:56 +0100604 */
605 if (parent == NULL)
606 parent_kobj = virtual_device_parent(dev);
607 else if (parent->class)
608 return &parent->kobj;
609 else
610 parent_kobj = &parent->kobj;
611
612 /* find our class-directory at the parent and reference it */
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500613 spin_lock(&dev->class->p->class_dirs.list_lock);
614 list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
Kay Sievers86406242007-03-14 03:25:56 +0100615 if (k->parent == parent_kobj) {
616 kobj = kobject_get(k);
617 break;
618 }
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500619 spin_unlock(&dev->class->p->class_dirs.list_lock);
Kay Sievers86406242007-03-14 03:25:56 +0100620 if (kobj)
621 return kobj;
622
623 /* or create a new class-directory at the parent device */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800624 k = kobject_create();
625 if (!k)
626 return NULL;
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500627 k->kset = &dev->class->p->class_dirs;
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700628 retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800629 if (retval < 0) {
630 kobject_put(k);
631 return NULL;
632 }
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100633 /* do not emit an uevent for this simple "glue" directory */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800634 return k;
Kay Sievers86406242007-03-14 03:25:56 +0100635 }
636
637 if (parent)
Cornelia Huckc744aea2007-01-08 20:16:44 +0100638 return &parent->kobj;
639 return NULL;
640}
Kay Sieversda231fd2007-11-21 17:29:15 +0100641
Cornelia Huck63b69712008-01-21 16:09:44 +0100642static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
Kay Sieversda231fd2007-11-21 17:29:15 +0100643{
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100644 /* see if we live in a "glue" directory */
Cornelia Huckc1fe5392008-02-27 15:38:23 +0100645 if (!glue_dir || !dev->class ||
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500646 glue_dir->kset != &dev->class->p->class_dirs)
Kay Sieversda231fd2007-11-21 17:29:15 +0100647 return;
648
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100649 kobject_put(glue_dir);
Kay Sieversda231fd2007-11-21 17:29:15 +0100650}
Cornelia Huck63b69712008-01-21 16:09:44 +0100651
652static void cleanup_device_parent(struct device *dev)
653{
654 cleanup_glue_dir(dev, dev->kobj.parent);
655}
Cornelia Huckc744aea2007-01-08 20:16:44 +0100656#endif
Kay Sievers86406242007-03-14 03:25:56 +0100657
Cornelia Huck63b69712008-01-21 16:09:44 +0100658static void setup_parent(struct device *dev, struct device *parent)
Cornelia Huckc744aea2007-01-08 20:16:44 +0100659{
660 struct kobject *kobj;
661 kobj = get_device_parent(dev, parent);
Cornelia Huckc744aea2007-01-08 20:16:44 +0100662 if (kobj)
663 dev->kobj.parent = kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100664}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100665
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700666static int device_add_class_symlinks(struct device *dev)
667{
668 int error;
669
670 if (!dev->class)
671 return 0;
Kay Sieversda231fd2007-11-21 17:29:15 +0100672
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700673 error = sysfs_create_link(&dev->kobj,
674 &dev->class->p->class_subsys.kobj,
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700675 "subsystem");
676 if (error)
677 goto out;
Kay Sieversda231fd2007-11-21 17:29:15 +0100678
679#ifdef CONFIG_SYSFS_DEPRECATED
680 /* stacked class devices need a symlink in the class directory */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700681 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800682 device_is_not_partition(dev)) {
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700683 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100684 &dev->kobj, dev_name(dev));
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700685 if (error)
686 goto out_subsys;
687 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100688
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800689 if (dev->parent && device_is_not_partition(dev)) {
Kay Sieversda231fd2007-11-21 17:29:15 +0100690 struct device *parent = dev->parent;
691 char *class_name;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700692
Kay Sieversda231fd2007-11-21 17:29:15 +0100693 /*
694 * stacked class devices have the 'device' link
695 * pointing to the bus device instead of the parent
696 */
697 while (parent->class && !parent->bus && parent->parent)
698 parent = parent->parent;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700699
Kay Sieversda231fd2007-11-21 17:29:15 +0100700 error = sysfs_create_link(&dev->kobj,
701 &parent->kobj,
702 "device");
703 if (error)
704 goto out_busid;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700705
Kay Sieversda231fd2007-11-21 17:29:15 +0100706 class_name = make_class_name(dev->class->name,
707 &dev->kobj);
708 if (class_name)
709 error = sysfs_create_link(&dev->parent->kobj,
710 &dev->kobj, class_name);
711 kfree(class_name);
712 if (error)
713 goto out_device;
714 }
715 return 0;
716
717out_device:
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800718 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100719 sysfs_remove_link(&dev->kobj, "device");
720out_busid:
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700721 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800722 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700723 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100724 dev_name(dev));
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700725#else
Kay Sieversda231fd2007-11-21 17:29:15 +0100726 /* link in the class directory pointing to the device */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700727 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100728 &dev->kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100729 if (error)
730 goto out_subsys;
731
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800732 if (dev->parent && device_is_not_partition(dev)) {
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700733 error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
734 "device");
735 if (error)
736 goto out_busid;
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700737 }
738 return 0;
739
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700740out_busid:
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100741 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100742#endif
743
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700744out_subsys:
745 sysfs_remove_link(&dev->kobj, "subsystem");
746out:
747 return error;
748}
749
750static void device_remove_class_symlinks(struct device *dev)
751{
752 if (!dev->class)
753 return;
Kay Sieversda231fd2007-11-21 17:29:15 +0100754
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700755#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800756 if (dev->parent && device_is_not_partition(dev)) {
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700757 char *class_name;
758
759 class_name = make_class_name(dev->class->name, &dev->kobj);
760 if (class_name) {
761 sysfs_remove_link(&dev->parent->kobj, class_name);
762 kfree(class_name);
763 }
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700764 sysfs_remove_link(&dev->kobj, "device");
765 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100766
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700767 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800768 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700769 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100770 dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100771#else
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800772 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100773 sysfs_remove_link(&dev->kobj, "device");
774
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100775 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100776#endif
777
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700778 sysfs_remove_link(&dev->kobj, "subsystem");
779}
780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781/**
Stephen Rothwell413c2392008-05-30 10:16:40 +1000782 * dev_set_name - set a device name
783 * @dev: device
Randy Dunlap46232362008-06-04 21:40:43 -0700784 * @fmt: format string for the device's name
Stephen Rothwell413c2392008-05-30 10:16:40 +1000785 */
786int dev_set_name(struct device *dev, const char *fmt, ...)
787{
788 va_list vargs;
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100789 int err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000790
791 va_start(vargs, fmt);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100792 err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
Stephen Rothwell413c2392008-05-30 10:16:40 +1000793 va_end(vargs);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100794 return err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000795}
796EXPORT_SYMBOL_GPL(dev_set_name);
797
798/**
Dan Williamse105b8b2008-04-21 10:51:07 -0700799 * device_to_dev_kobj - select a /sys/dev/ directory for the device
800 * @dev: device
801 *
802 * By default we select char/ for new entries. Setting class->dev_obj
803 * to NULL prevents an entry from being created. class->dev_kobj must
804 * be set (or cleared) before any devices are registered to the class
805 * otherwise device_create_sys_dev_entry() and
806 * device_remove_sys_dev_entry() will disagree about the the presence
807 * of the link.
808 */
809static struct kobject *device_to_dev_kobj(struct device *dev)
810{
811 struct kobject *kobj;
812
813 if (dev->class)
814 kobj = dev->class->dev_kobj;
815 else
816 kobj = sysfs_dev_char_kobj;
817
818 return kobj;
819}
820
821static int device_create_sys_dev_entry(struct device *dev)
822{
823 struct kobject *kobj = device_to_dev_kobj(dev);
824 int error = 0;
825 char devt_str[15];
826
827 if (kobj) {
828 format_dev_t(devt_str, dev->devt);
829 error = sysfs_create_link(kobj, &dev->kobj, devt_str);
830 }
831
832 return error;
833}
834
835static void device_remove_sys_dev_entry(struct device *dev)
836{
837 struct kobject *kobj = device_to_dev_kobj(dev);
838 char devt_str[15];
839
840 if (kobj) {
841 format_dev_t(devt_str, dev->devt);
842 sysfs_remove_link(kobj, devt_str);
843 }
844}
845
846/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800847 * device_add - add device to device hierarchy.
848 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800850 * This is part 2 of device_register(), though may be called
851 * separately _iff_ device_initialize() has been called separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 *
Cornelia Huck57394112008-09-03 18:26:40 +0200853 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800854 * to the global and sibling lists for the device, then
855 * adds it to the other relevant subsystems of the driver model.
Cornelia Huck57394112008-09-03 18:26:40 +0200856 *
857 * NOTE: _Never_ directly free @dev after calling this function, even
858 * if it returned an error! Always use put_device() to give up your
859 * reference instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 */
861int device_add(struct device *dev)
862{
863 struct device *parent = NULL;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200864 struct class_interface *class_intf;
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700865 int error = -EINVAL;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100866
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 dev = get_device(dev);
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700868 if (!dev)
869 goto done;
870
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800871 dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
872 if (!dev->p) {
873 error = -ENOMEM;
874 goto done;
875 }
876 dev->p->device = dev;
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800877 klist_init(&dev->p->klist_children, klist_children_get,
878 klist_children_put);
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800879
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100880 /*
881 * for statically allocated devices, which should all be converted
882 * some day, we need to initialize the name. We prevent reading back
883 * the name, and force the use of dev_name()
884 */
885 if (dev->init_name) {
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700886 dev_set_name(dev, "%s", dev->init_name);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100887 dev->init_name = NULL;
888 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700889
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100890 if (!dev_name(dev))
Kay Sievers5c8563d2009-05-28 14:24:07 -0700891 goto name_error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100893 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartmanc205ef42006-08-07 22:19:37 -0700894
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 parent = get_device(dev->parent);
Cornelia Huck63b69712008-01-21 16:09:44 +0100896 setup_parent(dev, parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
Yinghai Lu0d358f22008-02-19 03:20:41 -0800898 /* use parent numa_node */
899 if (parent)
900 set_dev_node(dev, dev_to_node(parent));
901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 /* first, register with generic layer. */
Kay Sievers8a577ff2009-04-18 15:05:45 -0700903 /* we require the name to be set before, and pass NULL */
904 error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100905 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 goto Error;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200907
Brian Walsh37022642006-08-14 22:43:19 -0700908 /* notify platform of device entry */
909 if (platform_notify)
910 platform_notify(dev);
911
Tejun Heoad6a1e12007-06-14 03:45:17 +0900912 error = device_create_file(dev, &uevent_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200913 if (error)
914 goto attrError;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200915
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700916 if (MAJOR(dev->devt)) {
Tejun Heoad6a1e12007-06-14 03:45:17 +0900917 error = device_create_file(dev, &devt_attr);
918 if (error)
Cornelia Hucka306eea2006-09-22 11:37:13 +0200919 goto ueventattrError;
Dan Williamse105b8b2008-04-21 10:51:07 -0700920
921 error = device_create_sys_dev_entry(dev);
922 if (error)
923 goto devtattrError;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700924 }
925
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700926 error = device_add_class_symlinks(dev);
927 if (error)
928 goto SymlinkError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700929 error = device_add_attrs(dev);
930 if (error)
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700931 goto AttrsError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700932 error = bus_add_device(dev);
933 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 goto BusError;
Alan Stern3b98aea2008-08-07 13:06:12 -0400935 error = dpm_sysfs_add(dev);
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100936 if (error)
Alan Stern3b98aea2008-08-07 13:06:12 -0400937 goto DPMError;
938 device_pm_add(dev);
Alan Sternec0676ee2008-12-05 14:10:31 -0500939
940 /* Notify clients of device addition. This call must come
941 * after dpm_sysf_add() and before kobject_uevent().
942 */
943 if (dev->bus)
944 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
945 BUS_NOTIFY_ADD_DEVICE, dev);
946
Cornelia Huck83b5fb4c2007-03-29 11:12:11 +0200947 kobject_uevent(&dev->kobj, KOBJ_ADD);
Cornelia Huckc6a46692007-02-05 16:15:26 -0800948 bus_attach_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800950 klist_add_tail(&dev->p->knode_parent,
951 &parent->p->klist_children);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700953 if (dev->class) {
Dave Youngf75b1c62008-05-28 09:28:39 -0700954 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200955 /* tie the class to the device */
Tejun Heo5a3ceb82008-08-25 19:50:19 +0200956 klist_add_tail(&dev->knode_class,
957 &dev->class->p->class_devices);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200958
959 /* notify any interfaces that the device is here */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -0700960 list_for_each_entry(class_intf,
961 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200962 if (class_intf->add_dev)
963 class_intf->add_dev(dev, class_intf);
Dave Youngf75b1c62008-05-28 09:28:39 -0700964 mutex_unlock(&dev->class->p->class_mutex);
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700965 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700966done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 put_device(dev);
968 return error;
Alan Stern3b98aea2008-08-07 13:06:12 -0400969 DPMError:
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100970 bus_remove_device(dev);
971 BusError:
James Simmons82f0cf92007-02-21 17:44:51 +0000972 device_remove_attrs(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700973 AttrsError:
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700974 device_remove_class_symlinks(dev);
975 SymlinkError:
Tejun Heoad6a1e12007-06-14 03:45:17 +0900976 if (MAJOR(dev->devt))
Dan Williamse105b8b2008-04-21 10:51:07 -0700977 device_remove_sys_dev_entry(dev);
978 devtattrError:
979 if (MAJOR(dev->devt))
Tejun Heoad6a1e12007-06-14 03:45:17 +0900980 device_remove_file(dev, &devt_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200981 ueventattrError:
Tejun Heoad6a1e12007-06-14 03:45:17 +0900982 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700983 attrError:
Kay Sievers312c0042005-11-16 09:00:00 +0100984 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 kobject_del(&dev->kobj);
986 Error:
Cornelia Huck63b69712008-01-21 16:09:44 +0100987 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 if (parent)
989 put_device(parent);
Kay Sievers5c8563d2009-05-28 14:24:07 -0700990name_error:
991 kfree(dev->p);
992 dev->p = NULL;
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700993 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994}
995
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800997 * device_register - register a device with the system.
998 * @dev: pointer to the device structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001000 * This happens in two clean steps - initialize the device
1001 * and add it to the system. The two steps can be called
1002 * separately, but this is the easiest and most common.
1003 * I.e. you should only call the two helpers separately if
1004 * have a clearly defined need to use and refcount the device
1005 * before it is added to the hierarchy.
Cornelia Huck57394112008-09-03 18:26:40 +02001006 *
1007 * NOTE: _Never_ directly free @dev after calling this function, even
1008 * if it returned an error! Always use put_device() to give up the
1009 * reference initialized in this function instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011int device_register(struct device *dev)
1012{
1013 device_initialize(dev);
1014 return device_add(dev);
1015}
1016
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001018 * get_device - increment reference count for device.
1019 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001021 * This simply forwards the call to kobject_get(), though
1022 * we do take care to provide for the case that we get a NULL
1023 * pointer passed in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001025struct device *get_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026{
1027 return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
1028}
1029
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001031 * put_device - decrement reference count.
1032 * @dev: device in question.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001034void put_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035{
Kay Sieversedfaa7c2007-05-21 22:08:01 +02001036 /* might_sleep(); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 if (dev)
1038 kobject_put(&dev->kobj);
1039}
1040
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001042 * device_del - delete device from system.
1043 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001045 * This is the first part of the device unregistration
1046 * sequence. This removes the device from the lists we control
1047 * from here, has it removed from the other driver model
1048 * subsystems it was added to in device_add(), and removes it
1049 * from the kobject hierarchy.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001051 * NOTE: this should be called manually _iff_ device_add() was
1052 * also called manually.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001054void device_del(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001056 struct device *parent = dev->parent;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001057 struct class_interface *class_intf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058
Alan Sternec0676ee2008-12-05 14:10:31 -05001059 /* Notify clients of device removal. This call must come
1060 * before dpm_sysfs_remove().
1061 */
1062 if (dev->bus)
1063 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
1064 BUS_NOTIFY_DEL_DEVICE, dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001065 device_pm_remove(dev);
Alan Stern3b98aea2008-08-07 13:06:12 -04001066 dpm_sysfs_remove(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001068 klist_del(&dev->p->knode_parent);
Dan Williamse105b8b2008-04-21 10:51:07 -07001069 if (MAJOR(dev->devt)) {
1070 device_remove_sys_dev_entry(dev);
Tejun Heoad6a1e12007-06-14 03:45:17 +09001071 device_remove_file(dev, &devt_attr);
Dan Williamse105b8b2008-04-21 10:51:07 -07001072 }
Kay Sieversb9d9c822006-06-15 15:31:56 +02001073 if (dev->class) {
Kay Sieversda231fd2007-11-21 17:29:15 +01001074 device_remove_class_symlinks(dev);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001075
Dave Youngf75b1c62008-05-28 09:28:39 -07001076 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001077 /* notify any interfaces that the device is now gone */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -07001078 list_for_each_entry(class_intf,
1079 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001080 if (class_intf->remove_dev)
1081 class_intf->remove_dev(dev, class_intf);
1082 /* remove the device from the class list */
Tejun Heo5a3ceb82008-08-25 19:50:19 +02001083 klist_del(&dev->knode_class);
Dave Youngf75b1c62008-05-28 09:28:39 -07001084 mutex_unlock(&dev->class->p->class_mutex);
Kay Sieversb9d9c822006-06-15 15:31:56 +02001085 }
Tejun Heoad6a1e12007-06-14 03:45:17 +09001086 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -07001087 device_remove_attrs(dev);
Benjamin Herrenschmidt28953532006-11-08 19:46:14 -08001088 bus_remove_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089
Tejun Heo2f8d16a2007-03-09 19:34:19 +09001090 /*
1091 * Some platform devices are driven without driver attached
1092 * and managed resources may have been acquired. Make sure
1093 * all resources are released.
1094 */
1095 devres_release_all(dev);
1096
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 /* Notify the platform of the removal, in case they
1098 * need to do anything...
1099 */
1100 if (platform_notify_remove)
1101 platform_notify_remove(dev);
Kay Sievers312c0042005-11-16 09:00:00 +01001102 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Kay Sieversda231fd2007-11-21 17:29:15 +01001103 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 kobject_del(&dev->kobj);
Kay Sieversda231fd2007-11-21 17:29:15 +01001105 put_device(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106}
1107
1108/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001109 * device_unregister - unregister device from system.
1110 * @dev: device going away.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001112 * We do this in two parts, like we do device_register(). First,
1113 * we remove it from all the subsystems with device_del(), then
1114 * we decrement the reference count via put_device(). If that
1115 * is the final reference count, the device will be cleaned up
1116 * via device_release() above. Otherwise, the structure will
1117 * stick around until the final reference to the device is dropped.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001119void device_unregister(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001121 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 device_del(dev);
1123 put_device(dev);
1124}
1125
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001126static struct device *next_device(struct klist_iter *i)
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001127{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001128 struct klist_node *n = klist_next(i);
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001129 struct device *dev = NULL;
1130 struct device_private *p;
1131
1132 if (n) {
1133 p = to_device_private_parent(n);
1134 dev = p->device;
1135 }
1136 return dev;
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001137}
1138
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139/**
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001140 * device_get_nodename - path of device node file
1141 * @dev: device
1142 * @tmp: possibly allocated string
1143 *
1144 * Return the relative path of a possible device node.
1145 * Non-default names may need to allocate a memory to compose
1146 * a name. This memory is returned in tmp and needs to be
1147 * freed by the caller.
1148 */
1149const char *device_get_nodename(struct device *dev, const char **tmp)
1150{
1151 char *s;
1152
1153 *tmp = NULL;
1154
1155 /* the device type may provide a specific name */
1156 if (dev->type && dev->type->nodename)
1157 *tmp = dev->type->nodename(dev);
1158 if (*tmp)
1159 return *tmp;
1160
1161 /* the class may provide a specific name */
1162 if (dev->class && dev->class->nodename)
1163 *tmp = dev->class->nodename(dev);
1164 if (*tmp)
1165 return *tmp;
1166
1167 /* return name without allocation, tmp == NULL */
1168 if (strchr(dev_name(dev), '!') == NULL)
1169 return dev_name(dev);
1170
1171 /* replace '!' in the name with '/' */
1172 *tmp = kstrdup(dev_name(dev), GFP_KERNEL);
1173 if (!*tmp)
1174 return NULL;
1175 while ((s = strchr(*tmp, '!')))
1176 s[0] = '/';
1177 return *tmp;
1178}
1179
1180/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001181 * device_for_each_child - device child iterator.
1182 * @parent: parent struct device.
1183 * @data: data for the callback.
1184 * @fn: function to be called for each device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001186 * Iterate over @parent's child devices, and call @fn for each,
1187 * passing it @data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001189 * We check the return of @fn each time. If it returns anything
1190 * other than 0, we break out and return that value.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001192int device_for_each_child(struct device *parent, void *data,
1193 int (*fn)(struct device *dev, void *data))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194{
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001195 struct klist_iter i;
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001196 struct device *child;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 int error = 0;
1198
Greg Kroah-Hartman014c90d2009-04-15 16:00:12 -07001199 if (!parent->p)
1200 return 0;
1201
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001202 klist_iter_init(&parent->p->klist_children, &i);
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001203 while ((child = next_device(&i)) && !error)
1204 error = fn(child, data);
1205 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 return error;
1207}
1208
Cornelia Huck5ab69982006-11-16 15:42:07 +01001209/**
1210 * device_find_child - device iterator for locating a particular device.
1211 * @parent: parent struct device
1212 * @data: Data to pass to match function
1213 * @match: Callback function to check device
1214 *
1215 * This is similar to the device_for_each_child() function above, but it
1216 * returns a reference to a device that is 'found' for later use, as
1217 * determined by the @match callback.
1218 *
1219 * The callback should return 0 if the device doesn't match and non-zero
1220 * if it does. If the callback returns non-zero and a reference to the
1221 * current device can be obtained, this function will return to the caller
1222 * and not iterate over any more devices.
1223 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001224struct device *device_find_child(struct device *parent, void *data,
1225 int (*match)(struct device *dev, void *data))
Cornelia Huck5ab69982006-11-16 15:42:07 +01001226{
1227 struct klist_iter i;
1228 struct device *child;
1229
1230 if (!parent)
1231 return NULL;
1232
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001233 klist_iter_init(&parent->p->klist_children, &i);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001234 while ((child = next_device(&i)))
1235 if (match(child, data) && get_device(child))
1236 break;
1237 klist_iter_exit(&i);
1238 return child;
1239}
1240
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241int __init devices_init(void)
1242{
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -06001243 devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
1244 if (!devices_kset)
1245 return -ENOMEM;
Dan Williamse105b8b2008-04-21 10:51:07 -07001246 dev_kobj = kobject_create_and_add("dev", NULL);
1247 if (!dev_kobj)
1248 goto dev_kobj_err;
1249 sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
1250 if (!sysfs_dev_block_kobj)
1251 goto block_kobj_err;
1252 sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
1253 if (!sysfs_dev_char_kobj)
1254 goto char_kobj_err;
1255
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -06001256 return 0;
Dan Williamse105b8b2008-04-21 10:51:07 -07001257
1258 char_kobj_err:
1259 kobject_put(sysfs_dev_block_kobj);
1260 block_kobj_err:
1261 kobject_put(dev_kobj);
1262 dev_kobj_err:
1263 kset_unregister(devices_kset);
1264 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265}
1266
1267EXPORT_SYMBOL_GPL(device_for_each_child);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001268EXPORT_SYMBOL_GPL(device_find_child);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269
1270EXPORT_SYMBOL_GPL(device_initialize);
1271EXPORT_SYMBOL_GPL(device_add);
1272EXPORT_SYMBOL_GPL(device_register);
1273
1274EXPORT_SYMBOL_GPL(device_del);
1275EXPORT_SYMBOL_GPL(device_unregister);
1276EXPORT_SYMBOL_GPL(get_device);
1277EXPORT_SYMBOL_GPL(put_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278
1279EXPORT_SYMBOL_GPL(device_create_file);
1280EXPORT_SYMBOL_GPL(device_remove_file);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001281
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001282struct root_device
1283{
1284 struct device dev;
1285 struct module *owner;
1286};
1287
1288#define to_root_device(dev) container_of(dev, struct root_device, dev)
1289
1290static void root_device_release(struct device *dev)
1291{
1292 kfree(to_root_device(dev));
1293}
1294
1295/**
1296 * __root_device_register - allocate and register a root device
1297 * @name: root device name
1298 * @owner: owner module of the root device, usually THIS_MODULE
1299 *
1300 * This function allocates a root device and registers it
1301 * using device_register(). In order to free the returned
1302 * device, use root_device_unregister().
1303 *
1304 * Root devices are dummy devices which allow other devices
1305 * to be grouped under /sys/devices. Use this function to
1306 * allocate a root device and then use it as the parent of
1307 * any device which should appear under /sys/devices/{name}
1308 *
1309 * The /sys/devices/{name} directory will also contain a
1310 * 'module' symlink which points to the @owner directory
1311 * in sysfs.
1312 *
1313 * Note: You probably want to use root_device_register().
1314 */
1315struct device *__root_device_register(const char *name, struct module *owner)
1316{
1317 struct root_device *root;
1318 int err = -ENOMEM;
1319
1320 root = kzalloc(sizeof(struct root_device), GFP_KERNEL);
1321 if (!root)
1322 return ERR_PTR(err);
1323
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -07001324 err = dev_set_name(&root->dev, "%s", name);
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001325 if (err) {
1326 kfree(root);
1327 return ERR_PTR(err);
1328 }
1329
1330 root->dev.release = root_device_release;
1331
1332 err = device_register(&root->dev);
1333 if (err) {
1334 put_device(&root->dev);
1335 return ERR_PTR(err);
1336 }
1337
1338#ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */
1339 if (owner) {
1340 struct module_kobject *mk = &owner->mkobj;
1341
1342 err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module");
1343 if (err) {
1344 device_unregister(&root->dev);
1345 return ERR_PTR(err);
1346 }
1347 root->owner = owner;
1348 }
1349#endif
1350
1351 return &root->dev;
1352}
1353EXPORT_SYMBOL_GPL(__root_device_register);
1354
1355/**
1356 * root_device_unregister - unregister and free a root device
Randy Dunlap7cbcf222009-01-20 16:29:13 -08001357 * @dev: device going away
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001358 *
1359 * This function unregisters and cleans up a device that was created by
1360 * root_device_register().
1361 */
1362void root_device_unregister(struct device *dev)
1363{
1364 struct root_device *root = to_root_device(dev);
1365
1366 if (root->owner)
1367 sysfs_remove_link(&root->dev.kobj, "module");
1368
1369 device_unregister(dev);
1370}
1371EXPORT_SYMBOL_GPL(root_device_unregister);
1372
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001373
1374static void device_create_release(struct device *dev)
1375{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001376 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001377 kfree(dev);
1378}
1379
1380/**
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001381 * device_create_vargs - creates a device and registers it with sysfs
1382 * @class: pointer to the struct class that this device should be registered to
1383 * @parent: pointer to the parent struct device of this new device, if any
1384 * @devt: the dev_t for the char device to be added
1385 * @drvdata: the data to be added to the device for callbacks
1386 * @fmt: string for the device's name
1387 * @args: va_list for the device's name
1388 *
1389 * This function can be used by char device classes. A struct device
1390 * will be created in sysfs, registered to the specified class.
1391 *
1392 * A "dev" file will be created, showing the dev_t for the device, if
1393 * the dev_t is not 0,0.
1394 * If a pointer to a parent struct device is passed in, the newly created
1395 * struct device will be a child of that device in sysfs.
1396 * The pointer to the struct device will be returned from the call.
1397 * Any further sysfs files that might be required can be created using this
1398 * pointer.
1399 *
1400 * Note: the struct class passed to this function must have previously
1401 * been created with a call to class_create().
1402 */
1403struct device *device_create_vargs(struct class *class, struct device *parent,
1404 dev_t devt, void *drvdata, const char *fmt,
1405 va_list args)
1406{
1407 struct device *dev = NULL;
1408 int retval = -ENODEV;
1409
1410 if (class == NULL || IS_ERR(class))
1411 goto error;
1412
1413 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1414 if (!dev) {
1415 retval = -ENOMEM;
1416 goto error;
1417 }
1418
1419 dev->devt = devt;
1420 dev->class = class;
1421 dev->parent = parent;
1422 dev->release = device_create_release;
1423 dev_set_drvdata(dev, drvdata);
1424
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001425 retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
1426 if (retval)
1427 goto error;
1428
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001429 retval = device_register(dev);
1430 if (retval)
1431 goto error;
1432
1433 return dev;
1434
1435error:
Cornelia Huck286661b2008-09-03 18:26:41 +02001436 put_device(dev);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001437 return ERR_PTR(retval);
1438}
1439EXPORT_SYMBOL_GPL(device_create_vargs);
1440
1441/**
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001442 * device_create - creates a device and registers it with sysfs
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001443 * @class: pointer to the struct class that this device should be registered to
1444 * @parent: pointer to the parent struct device of this new device, if any
1445 * @devt: the dev_t for the char device to be added
1446 * @drvdata: the data to be added to the device for callbacks
1447 * @fmt: string for the device's name
1448 *
1449 * This function can be used by char device classes. A struct device
1450 * will be created in sysfs, registered to the specified class.
1451 *
1452 * A "dev" file will be created, showing the dev_t for the device, if
1453 * the dev_t is not 0,0.
1454 * If a pointer to a parent struct device is passed in, the newly created
1455 * struct device will be a child of that device in sysfs.
1456 * The pointer to the struct device will be returned from the call.
1457 * Any further sysfs files that might be required can be created using this
1458 * pointer.
1459 *
1460 * Note: the struct class passed to this function must have previously
1461 * been created with a call to class_create().
1462 */
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001463struct device *device_create(struct class *class, struct device *parent,
1464 dev_t devt, void *drvdata, const char *fmt, ...)
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001465{
1466 va_list vargs;
1467 struct device *dev;
1468
1469 va_start(vargs, fmt);
1470 dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
1471 va_end(vargs);
1472 return dev;
1473}
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001474EXPORT_SYMBOL_GPL(device_create);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001475
Dave Youngcd354492008-01-28 16:56:11 +08001476static int __match_devt(struct device *dev, void *data)
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001477{
Dave Youngcd354492008-01-28 16:56:11 +08001478 dev_t *devt = data;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001479
Dave Youngcd354492008-01-28 16:56:11 +08001480 return dev->devt == *devt;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001481}
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001482
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001483/**
1484 * device_destroy - removes a device that was created with device_create()
1485 * @class: pointer to the struct class that this device was registered with
1486 * @devt: the dev_t of the device that was previously registered
1487 *
1488 * This call unregisters and cleans up a device that was created with a
1489 * call to device_create().
1490 */
1491void device_destroy(struct class *class, dev_t devt)
1492{
1493 struct device *dev;
1494
Greg Kroah-Hartman695794a2008-05-22 17:21:08 -04001495 dev = class_find_device(class, NULL, &devt, __match_devt);
Dave Youngcd354492008-01-28 16:56:11 +08001496 if (dev) {
1497 put_device(dev);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001498 device_unregister(dev);
Dave Youngcd354492008-01-28 16:56:11 +08001499 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001500}
1501EXPORT_SYMBOL_GPL(device_destroy);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001502
1503/**
1504 * device_rename - renames a device
1505 * @dev: the pointer to the struct device to be renamed
1506 * @new_name: the new name of the device
Eric W. Biederman030c1d22008-05-08 14:41:00 -07001507 *
1508 * It is the responsibility of the caller to provide mutual
1509 * exclusion between two different calls of device_rename
1510 * on the same device to ensure that new_name is valid and
1511 * won't conflict with other devices.
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001512 */
1513int device_rename(struct device *dev, char *new_name)
1514{
1515 char *old_class_name = NULL;
1516 char *new_class_name = NULL;
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001517 char *old_device_name = NULL;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001518 int error;
1519
1520 dev = get_device(dev);
1521 if (!dev)
1522 return -EINVAL;
1523
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001524 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -08001525 __func__, new_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001526
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001527#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001528 if ((dev->class) && (dev->parent))
1529 old_class_name = make_class_name(dev->class->name, &dev->kobj);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001530#endif
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001531
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001532 old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001533 if (!old_device_name) {
1534 error = -ENOMEM;
1535 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001536 }
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001537
1538 error = kobject_rename(&dev->kobj, new_name);
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001539 if (error)
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001540 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001541
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001542#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001543 if (old_class_name) {
1544 new_class_name = make_class_name(dev->class->name, &dev->kobj);
1545 if (new_class_name) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001546 error = sysfs_create_link_nowarn(&dev->parent->kobj,
1547 &dev->kobj,
1548 new_class_name);
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001549 if (error)
1550 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001551 sysfs_remove_link(&dev->parent->kobj, old_class_name);
1552 }
1553 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001554#else
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001555 if (dev->class) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001556 error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001557 &dev->kobj, dev_name(dev));
Stephen Hemminger0599ad52008-05-14 22:34:16 -07001558 if (error)
1559 goto out;
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -07001560 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -05001561 old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001562 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001563#endif
1564
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001565out:
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001566 put_device(dev);
1567
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001568 kfree(new_class_name);
Jesper Juhl952ab432006-09-28 23:56:01 +02001569 kfree(old_class_name);
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001570 kfree(old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001571
1572 return error;
1573}
Johannes Berga2807db2007-02-28 12:38:31 +01001574EXPORT_SYMBOL_GPL(device_rename);
Cornelia Huck8a824722006-11-20 17:07:51 +01001575
1576static int device_move_class_links(struct device *dev,
1577 struct device *old_parent,
1578 struct device *new_parent)
1579{
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001580 int error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001581#ifdef CONFIG_SYSFS_DEPRECATED
Cornelia Huck8a824722006-11-20 17:07:51 +01001582 char *class_name;
1583
1584 class_name = make_class_name(dev->class->name, &dev->kobj);
1585 if (!class_name) {
Cornelia Huckcb360bb2006-11-27 10:35:05 +01001586 error = -ENOMEM;
Cornelia Huck8a824722006-11-20 17:07:51 +01001587 goto out;
1588 }
1589 if (old_parent) {
1590 sysfs_remove_link(&dev->kobj, "device");
1591 sysfs_remove_link(&old_parent->kobj, class_name);
1592 }
Cornelia Huckc744aea2007-01-08 20:16:44 +01001593 if (new_parent) {
1594 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1595 "device");
1596 if (error)
1597 goto out;
1598 error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
1599 class_name);
1600 if (error)
1601 sysfs_remove_link(&dev->kobj, "device");
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001602 } else
Cornelia Huckc744aea2007-01-08 20:16:44 +01001603 error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001604out:
1605 kfree(class_name);
1606 return error;
1607#else
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001608 if (old_parent)
1609 sysfs_remove_link(&dev->kobj, "device");
1610 if (new_parent)
1611 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1612 "device");
1613 return error;
Cornelia Huck8a824722006-11-20 17:07:51 +01001614#endif
1615}
1616
1617/**
1618 * device_move - moves a device to a new parent
1619 * @dev: the pointer to the struct device to be moved
Cornelia Huckc744aea2007-01-08 20:16:44 +01001620 * @new_parent: the new parent of the device (can by NULL)
Cornelia Huckffa6a702009-03-04 12:44:00 +01001621 * @dpm_order: how to reorder the dpm_list
Cornelia Huck8a824722006-11-20 17:07:51 +01001622 */
Cornelia Huckffa6a702009-03-04 12:44:00 +01001623int device_move(struct device *dev, struct device *new_parent,
1624 enum dpm_order dpm_order)
Cornelia Huck8a824722006-11-20 17:07:51 +01001625{
1626 int error;
1627 struct device *old_parent;
Cornelia Huckc744aea2007-01-08 20:16:44 +01001628 struct kobject *new_parent_kobj;
Cornelia Huck8a824722006-11-20 17:07:51 +01001629
1630 dev = get_device(dev);
1631 if (!dev)
1632 return -EINVAL;
1633
Cornelia Huckffa6a702009-03-04 12:44:00 +01001634 device_pm_lock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001635 new_parent = get_device(new_parent);
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001636 new_parent_kobj = get_device_parent(dev, new_parent);
Cornelia Huck63b69712008-01-21 16:09:44 +01001637
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001638 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
1639 __func__, new_parent ? dev_name(new_parent) : "<NULL>");
Cornelia Huckc744aea2007-01-08 20:16:44 +01001640 error = kobject_move(&dev->kobj, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001641 if (error) {
Cornelia Huck63b69712008-01-21 16:09:44 +01001642 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001643 put_device(new_parent);
1644 goto out;
1645 }
1646 old_parent = dev->parent;
1647 dev->parent = new_parent;
1648 if (old_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001649 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001650 if (new_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001651 klist_add_tail(&dev->p->knode_parent,
1652 &new_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001653 set_dev_node(dev, dev_to_node(new_parent));
1654 }
1655
Cornelia Huck8a824722006-11-20 17:07:51 +01001656 if (!dev->class)
1657 goto out_put;
1658 error = device_move_class_links(dev, old_parent, new_parent);
1659 if (error) {
1660 /* We ignore errors on cleanup since we're hosed anyway... */
1661 device_move_class_links(dev, new_parent, old_parent);
1662 if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
Cornelia Huckc744aea2007-01-08 20:16:44 +01001663 if (new_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001664 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001665 dev->parent = old_parent;
1666 if (old_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001667 klist_add_tail(&dev->p->knode_parent,
1668 &old_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001669 set_dev_node(dev, dev_to_node(old_parent));
1670 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001671 }
Cornelia Huck63b69712008-01-21 16:09:44 +01001672 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001673 put_device(new_parent);
1674 goto out;
1675 }
Cornelia Huckffa6a702009-03-04 12:44:00 +01001676 switch (dpm_order) {
1677 case DPM_ORDER_NONE:
1678 break;
1679 case DPM_ORDER_DEV_AFTER_PARENT:
1680 device_pm_move_after(dev, new_parent);
1681 break;
1682 case DPM_ORDER_PARENT_BEFORE_DEV:
1683 device_pm_move_before(new_parent, dev);
1684 break;
1685 case DPM_ORDER_DEV_LAST:
1686 device_pm_move_last(dev);
1687 break;
1688 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001689out_put:
1690 put_device(old_parent);
1691out:
Cornelia Huckffa6a702009-03-04 12:44:00 +01001692 device_pm_unlock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001693 put_device(dev);
1694 return error;
1695}
Cornelia Huck8a824722006-11-20 17:07:51 +01001696EXPORT_SYMBOL_GPL(device_move);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001697
1698/**
1699 * device_shutdown - call ->shutdown() on each device to shutdown.
1700 */
1701void device_shutdown(void)
1702{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001703 struct device *dev, *devn;
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001704
1705 list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
1706 kobj.entry) {
1707 if (dev->bus && dev->bus->shutdown) {
1708 dev_dbg(dev, "shutdown\n");
1709 dev->bus->shutdown(dev);
1710 } else if (dev->driver && dev->driver->shutdown) {
1711 dev_dbg(dev, "shutdown\n");
1712 dev->driver->shutdown(dev);
1713 }
1714 }
Dan Williamse105b8b2008-04-21 10:51:07 -07001715 kobject_put(sysfs_dev_char_kobj);
1716 kobject_put(sysfs_dev_block_kobj);
1717 kobject_put(dev_kobj);
Shaohua Li401097e2009-05-12 13:37:57 -07001718 async_synchronize_full();
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001719}