blob: 4aa527b8a91381289eb175b33f46e3e418d10374 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include "base.h"
27#include "power/power.h"
28
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080029int (*platform_notify)(struct device *dev) = NULL;
30int (*platform_notify_remove)(struct device *dev) = NULL;
Dan Williamse105b8b2008-04-21 10:51:07 -070031static struct kobject *dev_kobj;
32struct kobject *sysfs_dev_char_kobj;
33struct kobject *sysfs_dev_block_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -080035#ifdef CONFIG_BLOCK
36static inline int device_is_not_partition(struct device *dev)
37{
38 return !(dev->type == &part_type);
39}
40#else
41static inline int device_is_not_partition(struct device *dev)
42{
43 return 1;
44}
45#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Alan Stern3e956372006-06-16 17:10:48 -040047/**
48 * dev_driver_string - Return a device's driver name, if at all possible
49 * @dev: struct device to get the name of
50 *
51 * Will return the device's driver's name if it is bound to a device. If
52 * the device is not bound to a device, it will return the name of the bus
53 * it is attached to. If it is not attached to a bus either, an empty
54 * string will be returned.
55 */
Jean Delvarebf9ca692008-07-30 12:29:21 -070056const char *dev_driver_string(const struct device *dev)
Alan Stern3e956372006-06-16 17:10:48 -040057{
58 return dev->driver ? dev->driver->name :
Jean Delvarea456b702007-03-09 16:33:10 +010059 (dev->bus ? dev->bus->name :
60 (dev->class ? dev->class->name : ""));
Alan Stern3e956372006-06-16 17:10:48 -040061}
Matthew Wilcox310a9222006-09-23 23:35:04 -060062EXPORT_SYMBOL(dev_driver_string);
Alan Stern3e956372006-06-16 17:10:48 -040063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#define to_dev(obj) container_of(obj, struct device, kobj)
65#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
66
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080067static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
68 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080070 struct device_attribute *dev_attr = to_dev_attr(attr);
71 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050072 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
74 if (dev_attr->show)
Yani Ioannou54b6f352005-05-17 06:39:34 -040075 ret = dev_attr->show(dev, dev_attr, buf);
Andrew Morton815d2d52008-03-04 15:09:07 -080076 if (ret >= (ssize_t)PAGE_SIZE) {
77 print_symbol("dev_attr_show: %s returned bad count\n",
78 (unsigned long)dev_attr->show);
79 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 return ret;
81}
82
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080083static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
84 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080086 struct device_attribute *dev_attr = to_dev_attr(attr);
87 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050088 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
90 if (dev_attr->store)
Yani Ioannou54b6f352005-05-17 06:39:34 -040091 ret = dev_attr->store(dev, dev_attr, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 return ret;
93}
94
95static struct sysfs_ops dev_sysfs_ops = {
96 .show = dev_attr_show,
97 .store = dev_attr_store,
98};
99
100
101/**
102 * device_release - free device structure.
103 * @kobj: device's kobject.
104 *
105 * This is called once the reference count for the object
106 * reaches 0. We forward the call to the device's release
107 * method, which should handle actually freeing the structure.
108 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800109static void device_release(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800111 struct device *dev = to_dev(kobj);
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800112 struct device_private *p = dev->p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114 if (dev->release)
115 dev->release(dev);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200116 else if (dev->type && dev->type->release)
117 dev->type->release(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700118 else if (dev->class && dev->class->dev_release)
119 dev->class->dev_release(dev);
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700120 else
121 WARN(1, KERN_ERR "Device '%s' does not have a release() "
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800122 "function, it is broken and must be fixed.\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100123 dev_name(dev));
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800124 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125}
126
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600127static struct kobj_type device_ktype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 .release = device_release,
129 .sysfs_ops = &dev_sysfs_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130};
131
132
Kay Sievers312c0042005-11-16 09:00:00 +0100133static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134{
135 struct kobj_type *ktype = get_ktype(kobj);
136
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600137 if (ktype == &device_ktype) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 struct device *dev = to_dev(kobj);
139 if (dev->bus)
140 return 1;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700141 if (dev->class)
142 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 }
144 return 0;
145}
146
Kay Sievers312c0042005-11-16 09:00:00 +0100147static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
149 struct device *dev = to_dev(kobj);
150
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700151 if (dev->bus)
152 return dev->bus->name;
153 if (dev->class)
154 return dev->class->name;
155 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
Kay Sievers7eff2e72007-08-14 15:15:12 +0200158static int dev_uevent(struct kset *kset, struct kobject *kobj,
159 struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 struct device *dev = to_dev(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 int retval = 0;
163
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700164 /* add the major/minor if present */
165 if (MAJOR(dev->devt)) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200166 add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
167 add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700168 }
169
Kay Sievers414264f2007-03-12 21:08:57 +0100170 if (dev->type && dev->type->name)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200171 add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
Kay Sievers414264f2007-03-12 21:08:57 +0100172
Kay Sievers239378f2006-10-07 21:54:55 +0200173 if (dev->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200174 add_uevent_var(env, "DRIVER=%s", dev->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200175
Kay Sieversa87cb2a2006-09-14 11:23:28 +0200176#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sievers239378f2006-10-07 21:54:55 +0200177 if (dev->class) {
178 struct device *parent = dev->parent;
179
180 /* find first bus device in parent chain */
181 while (parent && !parent->bus)
182 parent = parent->parent;
183 if (parent && parent->bus) {
184 const char *path;
185
186 path = kobject_get_path(&parent->kobj, GFP_KERNEL);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200187 if (path) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200188 add_uevent_var(env, "PHYSDEVPATH=%s", path);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200189 kfree(path);
190 }
Kay Sievers239378f2006-10-07 21:54:55 +0200191
Kay Sievers7eff2e72007-08-14 15:15:12 +0200192 add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200193
194 if (parent->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200195 add_uevent_var(env, "PHYSDEVDRIVER=%s",
196 parent->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200197 }
198 } else if (dev->bus) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200199 add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200200
201 if (dev->driver)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800202 add_uevent_var(env, "PHYSDEVDRIVER=%s",
203 dev->driver->name);
Kay Sieversd81d9d62006-08-13 06:17:09 +0200204 }
Kay Sievers239378f2006-10-07 21:54:55 +0200205#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
Kay Sievers7eff2e72007-08-14 15:15:12 +0200207 /* have the bus specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100208 if (dev->bus && dev->bus->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200209 retval = dev->bus->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200210 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800211 pr_debug("device: '%s': %s: bus uevent() returned %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100212 dev_name(dev), __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 }
214
Kay Sievers7eff2e72007-08-14 15:15:12 +0200215 /* have the class specific function add its stuff */
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700216 if (dev->class && dev->class->dev_uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200217 retval = dev->class->dev_uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200218 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800219 pr_debug("device: '%s': %s: class uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100220 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800221 __func__, retval);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200222 }
223
Kay Sievers7eff2e72007-08-14 15:15:12 +0200224 /* have the device type specific fuction add its stuff */
Kay Sieversf9f852d2006-10-07 21:54:55 +0200225 if (dev->type && dev->type->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200226 retval = dev->type->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: dev_type 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);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700231 }
232
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return retval;
234}
235
Kay Sievers312c0042005-11-16 09:00:00 +0100236static struct kset_uevent_ops device_uevent_ops = {
237 .filter = dev_uevent_filter,
238 .name = dev_uevent_name,
239 .uevent = dev_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240};
241
Kay Sievers16574dc2007-04-06 01:40:38 +0200242static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
243 char *buf)
244{
245 struct kobject *top_kobj;
246 struct kset *kset;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200247 struct kobj_uevent_env *env = NULL;
Kay Sievers16574dc2007-04-06 01:40:38 +0200248 int i;
249 size_t count = 0;
250 int retval;
251
252 /* search the kset, the device belongs to */
253 top_kobj = &dev->kobj;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200254 while (!top_kobj->kset && top_kobj->parent)
255 top_kobj = top_kobj->parent;
Kay Sievers16574dc2007-04-06 01:40:38 +0200256 if (!top_kobj->kset)
257 goto out;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200258
Kay Sievers16574dc2007-04-06 01:40:38 +0200259 kset = top_kobj->kset;
260 if (!kset->uevent_ops || !kset->uevent_ops->uevent)
261 goto out;
262
263 /* respect filter */
264 if (kset->uevent_ops && kset->uevent_ops->filter)
265 if (!kset->uevent_ops->filter(kset, &dev->kobj))
266 goto out;
267
Kay Sievers7eff2e72007-08-14 15:15:12 +0200268 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
269 if (!env)
Greg Kroah-Hartmanc7308c82007-05-02 14:14:11 +0200270 return -ENOMEM;
271
Kay Sievers16574dc2007-04-06 01:40:38 +0200272 /* let the kset specific function add its keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200273 retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200274 if (retval)
275 goto out;
276
277 /* copy keys to file */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200278 for (i = 0; i < env->envp_idx; i++)
279 count += sprintf(&buf[count], "%s\n", env->envp[i]);
Kay Sievers16574dc2007-04-06 01:40:38 +0200280out:
Kay Sievers7eff2e72007-08-14 15:15:12 +0200281 kfree(env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200282 return count;
283}
284
Kay Sieversa7fd6702005-10-01 14:49:43 +0200285static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
286 const char *buf, size_t count)
287{
Kay Sievers60a96a52007-07-08 22:29:26 +0200288 enum kobject_action action;
289
Kay Sievers5c5daf62007-08-12 20:43:55 +0200290 if (kobject_action_type(buf, count, &action) == 0) {
Kay Sievers60a96a52007-07-08 22:29:26 +0200291 kobject_uevent(&dev->kobj, action);
292 goto out;
293 }
294
295 dev_err(dev, "uevent: unsupported action-string; this will "
296 "be ignored in a future kernel version\n");
Kay Sievers312c0042005-11-16 09:00:00 +0100297 kobject_uevent(&dev->kobj, KOBJ_ADD);
Kay Sievers60a96a52007-07-08 22:29:26 +0200298out:
Kay Sieversa7fd6702005-10-01 14:49:43 +0200299 return count;
300}
301
Tejun Heoad6a1e12007-06-14 03:45:17 +0900302static struct device_attribute uevent_attr =
303 __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
304
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500305static int device_add_attributes(struct device *dev,
306 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700307{
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700308 int error = 0;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500309 int i;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700310
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500311 if (attrs) {
312 for (i = 0; attr_name(attrs[i]); i++) {
313 error = device_create_file(dev, &attrs[i]);
314 if (error)
315 break;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700316 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500317 if (error)
318 while (--i >= 0)
319 device_remove_file(dev, &attrs[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700320 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700321 return error;
322}
323
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500324static void device_remove_attributes(struct device *dev,
325 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700326{
327 int i;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500328
329 if (attrs)
330 for (i = 0; attr_name(attrs[i]); i++)
331 device_remove_file(dev, &attrs[i]);
332}
333
334static int device_add_groups(struct device *dev,
335 struct attribute_group **groups)
336{
337 int error = 0;
338 int i;
339
340 if (groups) {
341 for (i = 0; groups[i]; i++) {
342 error = sysfs_create_group(&dev->kobj, groups[i]);
343 if (error) {
344 while (--i >= 0)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800345 sysfs_remove_group(&dev->kobj,
346 groups[i]);
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500347 break;
348 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700349 }
350 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500351 return error;
352}
353
354static void device_remove_groups(struct device *dev,
355 struct attribute_group **groups)
356{
357 int i;
358
359 if (groups)
360 for (i = 0; groups[i]; i++)
361 sysfs_remove_group(&dev->kobj, groups[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700362}
363
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700364static int device_add_attrs(struct device *dev)
365{
366 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200367 struct device_type *type = dev->type;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500368 int error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700369
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500370 if (class) {
371 error = device_add_attributes(dev, class->dev_attrs);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200372 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500373 return error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700374 }
Kay Sieversf9f852d2006-10-07 21:54:55 +0200375
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500376 if (type) {
377 error = device_add_groups(dev, type->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200378 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500379 goto err_remove_class_attrs;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200380 }
381
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500382 error = device_add_groups(dev, dev->groups);
383 if (error)
384 goto err_remove_type_groups;
385
386 return 0;
387
388 err_remove_type_groups:
389 if (type)
390 device_remove_groups(dev, type->groups);
391 err_remove_class_attrs:
392 if (class)
393 device_remove_attributes(dev, class->dev_attrs);
394
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700395 return error;
396}
397
398static void device_remove_attrs(struct device *dev)
399{
400 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200401 struct device_type *type = dev->type;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700402
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500403 device_remove_groups(dev, dev->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200404
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500405 if (type)
406 device_remove_groups(dev, type->groups);
407
408 if (class)
409 device_remove_attributes(dev, class->dev_attrs);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700410}
411
412
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700413static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
414 char *buf)
415{
416 return print_dev_t(buf, dev->devt);
417}
418
Tejun Heoad6a1e12007-06-14 03:45:17 +0900419static struct device_attribute devt_attr =
420 __ATTR(dev, S_IRUGO, show_dev, NULL);
421
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600422/* kset to create /sys/devices/ */
423struct kset *devices_kset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800426 * device_create_file - create sysfs attribute file for device.
427 * @dev: device.
428 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800430int device_create_file(struct device *dev, struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431{
432 int error = 0;
Cornelia Huck0c98b192008-01-31 10:39:38 +0100433 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 error = sysfs_create_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 return error;
436}
437
438/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800439 * device_remove_file - remove sysfs attribute file.
440 * @dev: device.
441 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800443void device_remove_file(struct device *dev, struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444{
Cornelia Huck0c98b192008-01-31 10:39:38 +0100445 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 sysfs_remove_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447}
448
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700449/**
450 * device_create_bin_file - create sysfs binary attribute file for device.
451 * @dev: device.
452 * @attr: device binary attribute descriptor.
453 */
454int device_create_bin_file(struct device *dev, struct bin_attribute *attr)
455{
456 int error = -EINVAL;
457 if (dev)
458 error = sysfs_create_bin_file(&dev->kobj, attr);
459 return error;
460}
461EXPORT_SYMBOL_GPL(device_create_bin_file);
462
463/**
464 * device_remove_bin_file - remove sysfs binary attribute file
465 * @dev: device.
466 * @attr: device binary attribute descriptor.
467 */
468void device_remove_bin_file(struct device *dev, struct bin_attribute *attr)
469{
470 if (dev)
471 sysfs_remove_bin_file(&dev->kobj, attr);
472}
473EXPORT_SYMBOL_GPL(device_remove_bin_file);
474
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400475/**
Alan Stern523ded72007-04-26 00:12:04 -0700476 * device_schedule_callback_owner - helper to schedule a callback for a device
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400477 * @dev: device.
478 * @func: callback function to invoke later.
Alan Stern523ded72007-04-26 00:12:04 -0700479 * @owner: module owning the callback routine
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400480 *
481 * Attribute methods must not unregister themselves or their parent device
482 * (which would amount to the same thing). Attempts to do so will deadlock,
483 * since unregistration is mutually exclusive with driver callbacks.
484 *
485 * Instead methods can call this routine, which will attempt to allocate
486 * and schedule a workqueue request to call back @func with @dev as its
487 * argument in the workqueue's process context. @dev will be pinned until
488 * @func returns.
489 *
Alan Stern523ded72007-04-26 00:12:04 -0700490 * This routine is usually called via the inline device_schedule_callback(),
491 * which automatically sets @owner to THIS_MODULE.
492 *
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400493 * Returns 0 if the request was submitted, -ENOMEM if storage could not
Alan Stern523ded72007-04-26 00:12:04 -0700494 * be allocated, -ENODEV if a reference to @owner isn't available.
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400495 *
496 * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
497 * underlying sysfs routine (since it is intended for use by attribute
498 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
499 */
Alan Stern523ded72007-04-26 00:12:04 -0700500int device_schedule_callback_owner(struct device *dev,
501 void (*func)(struct device *), struct module *owner)
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400502{
503 return sysfs_schedule_callback(&dev->kobj,
Alan Stern523ded72007-04-26 00:12:04 -0700504 (void (*)(void *)) func, dev, owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400505}
Alan Stern523ded72007-04-26 00:12:04 -0700506EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400507
James Bottomley34bb61f2005-09-06 16:56:51 -0700508static void klist_children_get(struct klist_node *n)
509{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800510 struct device_private *p = to_device_private_parent(n);
511 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700512
513 get_device(dev);
514}
515
516static void klist_children_put(struct klist_node *n)
517{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800518 struct device_private *p = to_device_private_parent(n);
519 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700520
521 put_device(dev);
522}
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800525 * device_initialize - init device structure.
526 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 *
Cornelia Huck57394112008-09-03 18:26:40 +0200528 * This prepares the device for use by other layers by initializing
529 * its fields.
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800530 * It is the first half of device_register(), if called by
Cornelia Huck57394112008-09-03 18:26:40 +0200531 * that function, though it can also be called separately, so one
532 * may use @dev's fields. In particular, get_device()/put_device()
533 * may be used for reference counting of @dev after calling this
534 * function.
535 *
536 * NOTE: Use put_device() to give up your reference instead of freeing
537 * @dev directly once you have called this function.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539void device_initialize(struct device *dev)
540{
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600541 dev->kobj.kset = devices_kset;
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700542 kobject_init(&dev->kobj, &device_ktype);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 INIT_LIST_HEAD(&dev->dma_pools);
mochel@digitalimplant.orgaf703162005-03-21 10:41:04 -0800544 init_MUTEX(&dev->sem);
Tejun Heo9ac78492007-01-20 16:00:26 +0900545 spin_lock_init(&dev->devres_lock);
546 INIT_LIST_HEAD(&dev->devres_head);
David Brownell0ac85242005-09-12 19:39:34 -0700547 device_init_wakeup(dev, 0);
Alan Stern3b98aea2008-08-07 13:06:12 -0400548 device_pm_init(dev);
Christoph Hellwig87348132006-12-06 20:32:33 -0800549 set_dev_node(dev, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550}
551
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100552#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sieversda231fd2007-11-21 17:29:15 +0100553static struct kobject *get_device_parent(struct device *dev,
554 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100555{
Kay Sieversda231fd2007-11-21 17:29:15 +0100556 /* class devices without a parent live in /sys/class/<classname>/ */
Dmitry Torokhov3eb215d2007-10-07 12:22:21 -0400557 if (dev->class && (!parent || parent->class != dev->class))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700558 return &dev->class->p->class_subsys.kobj;
Kay Sieversda231fd2007-11-21 17:29:15 +0100559 /* all other devices keep their parent */
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100560 else if (parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100561 return &parent->kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100562
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100563 return NULL;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100564}
Kay Sieversda231fd2007-11-21 17:29:15 +0100565
566static inline void cleanup_device_parent(struct device *dev) {}
Cornelia Huck63b69712008-01-21 16:09:44 +0100567static inline void cleanup_glue_dir(struct device *dev,
568 struct kobject *glue_dir) {}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100569#else
Kay Sievers86406242007-03-14 03:25:56 +0100570static struct kobject *virtual_device_parent(struct device *dev)
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700571{
Kay Sievers86406242007-03-14 03:25:56 +0100572 static struct kobject *virtual_dir = NULL;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700573
Kay Sievers86406242007-03-14 03:25:56 +0100574 if (!virtual_dir)
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -0800575 virtual_dir = kobject_create_and_add("virtual",
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600576 &devices_kset->kobj);
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700577
Kay Sievers86406242007-03-14 03:25:56 +0100578 return virtual_dir;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700579}
580
Kay Sieversda231fd2007-11-21 17:29:15 +0100581static struct kobject *get_device_parent(struct device *dev,
582 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100583{
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800584 int retval;
585
Kay Sievers86406242007-03-14 03:25:56 +0100586 if (dev->class) {
587 struct kobject *kobj = NULL;
588 struct kobject *parent_kobj;
589 struct kobject *k;
590
591 /*
592 * If we have no parent, we live in "virtual".
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100593 * Class-devices with a non class-device as parent, live
594 * in a "glue" directory to prevent namespace collisions.
Kay Sievers86406242007-03-14 03:25:56 +0100595 */
596 if (parent == NULL)
597 parent_kobj = virtual_device_parent(dev);
598 else if (parent->class)
599 return &parent->kobj;
600 else
601 parent_kobj = &parent->kobj;
602
603 /* find our class-directory at the parent and reference it */
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500604 spin_lock(&dev->class->p->class_dirs.list_lock);
605 list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
Kay Sievers86406242007-03-14 03:25:56 +0100606 if (k->parent == parent_kobj) {
607 kobj = kobject_get(k);
608 break;
609 }
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500610 spin_unlock(&dev->class->p->class_dirs.list_lock);
Kay Sievers86406242007-03-14 03:25:56 +0100611 if (kobj)
612 return kobj;
613
614 /* or create a new class-directory at the parent device */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800615 k = kobject_create();
616 if (!k)
617 return NULL;
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500618 k->kset = &dev->class->p->class_dirs;
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700619 retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800620 if (retval < 0) {
621 kobject_put(k);
622 return NULL;
623 }
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100624 /* do not emit an uevent for this simple "glue" directory */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800625 return k;
Kay Sievers86406242007-03-14 03:25:56 +0100626 }
627
628 if (parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100629 return &parent->kobj;
630 return NULL;
631}
Kay Sieversda231fd2007-11-21 17:29:15 +0100632
Cornelia Huck63b69712008-01-21 16:09:44 +0100633static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
Kay Sieversda231fd2007-11-21 17:29:15 +0100634{
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100635 /* see if we live in a "glue" directory */
Cornelia Huckc1fe5392008-02-27 15:38:23 +0100636 if (!glue_dir || !dev->class ||
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500637 glue_dir->kset != &dev->class->p->class_dirs)
Kay Sieversda231fd2007-11-21 17:29:15 +0100638 return;
639
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100640 kobject_put(glue_dir);
Kay Sieversda231fd2007-11-21 17:29:15 +0100641}
Cornelia Huck63b69712008-01-21 16:09:44 +0100642
643static void cleanup_device_parent(struct device *dev)
644{
645 cleanup_glue_dir(dev, dev->kobj.parent);
646}
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100647#endif
Kay Sievers86406242007-03-14 03:25:56 +0100648
Cornelia Huck63b69712008-01-21 16:09:44 +0100649static void setup_parent(struct device *dev, struct device *parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100650{
651 struct kobject *kobj;
652 kobj = get_device_parent(dev, parent);
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100653 if (kobj)
654 dev->kobj.parent = kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100655}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100656
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700657static int device_add_class_symlinks(struct device *dev)
658{
659 int error;
660
661 if (!dev->class)
662 return 0;
Kay Sieversda231fd2007-11-21 17:29:15 +0100663
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700664 error = sysfs_create_link(&dev->kobj,
665 &dev->class->p->class_subsys.kobj,
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700666 "subsystem");
667 if (error)
668 goto out;
Kay Sieversda231fd2007-11-21 17:29:15 +0100669
670#ifdef CONFIG_SYSFS_DEPRECATED
671 /* stacked class devices need a symlink in the class directory */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700672 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800673 device_is_not_partition(dev)) {
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700674 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100675 &dev->kobj, dev_name(dev));
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700676 if (error)
677 goto out_subsys;
678 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100679
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800680 if (dev->parent && device_is_not_partition(dev)) {
Kay Sieversda231fd2007-11-21 17:29:15 +0100681 struct device *parent = dev->parent;
682 char *class_name;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700683
Kay Sieversda231fd2007-11-21 17:29:15 +0100684 /*
685 * stacked class devices have the 'device' link
686 * pointing to the bus device instead of the parent
687 */
688 while (parent->class && !parent->bus && parent->parent)
689 parent = parent->parent;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700690
Kay Sieversda231fd2007-11-21 17:29:15 +0100691 error = sysfs_create_link(&dev->kobj,
692 &parent->kobj,
693 "device");
694 if (error)
695 goto out_busid;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700696
Kay Sieversda231fd2007-11-21 17:29:15 +0100697 class_name = make_class_name(dev->class->name,
698 &dev->kobj);
699 if (class_name)
700 error = sysfs_create_link(&dev->parent->kobj,
701 &dev->kobj, class_name);
702 kfree(class_name);
703 if (error)
704 goto out_device;
705 }
706 return 0;
707
708out_device:
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800709 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100710 sysfs_remove_link(&dev->kobj, "device");
711out_busid:
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700712 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800713 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700714 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100715 dev_name(dev));
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700716#else
Kay Sieversda231fd2007-11-21 17:29:15 +0100717 /* link in the class directory pointing to the device */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700718 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100719 &dev->kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100720 if (error)
721 goto out_subsys;
722
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800723 if (dev->parent && device_is_not_partition(dev)) {
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700724 error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
725 "device");
726 if (error)
727 goto out_busid;
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700728 }
729 return 0;
730
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700731out_busid:
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100732 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100733#endif
734
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700735out_subsys:
736 sysfs_remove_link(&dev->kobj, "subsystem");
737out:
738 return error;
739}
740
741static void device_remove_class_symlinks(struct device *dev)
742{
743 if (!dev->class)
744 return;
Kay Sieversda231fd2007-11-21 17:29:15 +0100745
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700746#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800747 if (dev->parent && device_is_not_partition(dev)) {
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700748 char *class_name;
749
750 class_name = make_class_name(dev->class->name, &dev->kobj);
751 if (class_name) {
752 sysfs_remove_link(&dev->parent->kobj, class_name);
753 kfree(class_name);
754 }
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700755 sysfs_remove_link(&dev->kobj, "device");
756 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100757
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700758 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800759 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700760 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100761 dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100762#else
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800763 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100764 sysfs_remove_link(&dev->kobj, "device");
765
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100766 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100767#endif
768
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700769 sysfs_remove_link(&dev->kobj, "subsystem");
770}
771
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772/**
Stephen Rothwell413c2392008-05-30 10:16:40 +1000773 * dev_set_name - set a device name
774 * @dev: device
Randy Dunlap46232362008-06-04 21:40:43 -0700775 * @fmt: format string for the device's name
Stephen Rothwell413c2392008-05-30 10:16:40 +1000776 */
777int dev_set_name(struct device *dev, const char *fmt, ...)
778{
779 va_list vargs;
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100780 int err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000781
782 va_start(vargs, fmt);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100783 err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
Stephen Rothwell413c2392008-05-30 10:16:40 +1000784 va_end(vargs);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100785 return err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000786}
787EXPORT_SYMBOL_GPL(dev_set_name);
788
789/**
Dan Williamse105b8b2008-04-21 10:51:07 -0700790 * device_to_dev_kobj - select a /sys/dev/ directory for the device
791 * @dev: device
792 *
793 * By default we select char/ for new entries. Setting class->dev_obj
794 * to NULL prevents an entry from being created. class->dev_kobj must
795 * be set (or cleared) before any devices are registered to the class
796 * otherwise device_create_sys_dev_entry() and
797 * device_remove_sys_dev_entry() will disagree about the the presence
798 * of the link.
799 */
800static struct kobject *device_to_dev_kobj(struct device *dev)
801{
802 struct kobject *kobj;
803
804 if (dev->class)
805 kobj = dev->class->dev_kobj;
806 else
807 kobj = sysfs_dev_char_kobj;
808
809 return kobj;
810}
811
812static int device_create_sys_dev_entry(struct device *dev)
813{
814 struct kobject *kobj = device_to_dev_kobj(dev);
815 int error = 0;
816 char devt_str[15];
817
818 if (kobj) {
819 format_dev_t(devt_str, dev->devt);
820 error = sysfs_create_link(kobj, &dev->kobj, devt_str);
821 }
822
823 return error;
824}
825
826static void device_remove_sys_dev_entry(struct device *dev)
827{
828 struct kobject *kobj = device_to_dev_kobj(dev);
829 char devt_str[15];
830
831 if (kobj) {
832 format_dev_t(devt_str, dev->devt);
833 sysfs_remove_link(kobj, devt_str);
834 }
835}
836
837/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800838 * device_add - add device to device hierarchy.
839 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800841 * This is part 2 of device_register(), though may be called
842 * separately _iff_ device_initialize() has been called separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 *
Cornelia Huck57394112008-09-03 18:26:40 +0200844 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800845 * to the global and sibling lists for the device, then
846 * adds it to the other relevant subsystems of the driver model.
Cornelia Huck57394112008-09-03 18:26:40 +0200847 *
848 * NOTE: _Never_ directly free @dev after calling this function, even
849 * if it returned an error! Always use put_device() to give up your
850 * reference instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 */
852int device_add(struct device *dev)
853{
854 struct device *parent = NULL;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200855 struct class_interface *class_intf;
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700856 int error = -EINVAL;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100857
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 dev = get_device(dev);
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700859 if (!dev)
860 goto done;
861
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800862 dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
863 if (!dev->p) {
864 error = -ENOMEM;
865 goto done;
866 }
867 dev->p->device = dev;
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800868 klist_init(&dev->p->klist_children, klist_children_get,
869 klist_children_put);
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800870
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100871 /*
872 * for statically allocated devices, which should all be converted
873 * some day, we need to initialize the name. We prevent reading back
874 * the name, and force the use of dev_name()
875 */
876 if (dev->init_name) {
877 dev_set_name(dev, dev->init_name);
878 dev->init_name = NULL;
879 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700880
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100881 if (!dev_name(dev))
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700882 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100884 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartmanc205ef42006-08-07 22:19:37 -0700885
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 parent = get_device(dev->parent);
Cornelia Huck63b69712008-01-21 16:09:44 +0100887 setup_parent(dev, parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
Yinghai Lu0d358f22008-02-19 03:20:41 -0800889 /* use parent numa_node */
890 if (parent)
891 set_dev_node(dev, dev_to_node(parent));
892
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 /* first, register with generic layer. */
Kay Sievers8a577ff2009-04-18 15:05:45 -0700894 /* we require the name to be set before, and pass NULL */
895 error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100896 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 goto Error;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200898
Brian Walsh37022642006-08-14 22:43:19 -0700899 /* notify platform of device entry */
900 if (platform_notify)
901 platform_notify(dev);
902
Tejun Heoad6a1e12007-06-14 03:45:17 +0900903 error = device_create_file(dev, &uevent_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200904 if (error)
905 goto attrError;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200906
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700907 if (MAJOR(dev->devt)) {
Tejun Heoad6a1e12007-06-14 03:45:17 +0900908 error = device_create_file(dev, &devt_attr);
909 if (error)
Cornelia Hucka306eea2006-09-22 11:37:13 +0200910 goto ueventattrError;
Dan Williamse105b8b2008-04-21 10:51:07 -0700911
912 error = device_create_sys_dev_entry(dev);
913 if (error)
914 goto devtattrError;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700915 }
916
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700917 error = device_add_class_symlinks(dev);
918 if (error)
919 goto SymlinkError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700920 error = device_add_attrs(dev);
921 if (error)
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700922 goto AttrsError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700923 error = bus_add_device(dev);
924 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 goto BusError;
Alan Stern3b98aea2008-08-07 13:06:12 -0400926 error = dpm_sysfs_add(dev);
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100927 if (error)
Alan Stern3b98aea2008-08-07 13:06:12 -0400928 goto DPMError;
929 device_pm_add(dev);
Alan Sternec0676ee2008-12-05 14:10:31 -0500930
931 /* Notify clients of device addition. This call must come
932 * after dpm_sysf_add() and before kobject_uevent().
933 */
934 if (dev->bus)
935 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
936 BUS_NOTIFY_ADD_DEVICE, dev);
937
Cornelia Huck83b5fb4c2007-03-29 11:12:11 +0200938 kobject_uevent(&dev->kobj, KOBJ_ADD);
Cornelia Huckc6a46692007-02-05 16:15:26 -0800939 bus_attach_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800941 klist_add_tail(&dev->p->knode_parent,
942 &parent->p->klist_children);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700944 if (dev->class) {
Dave Youngf75b1c62008-05-28 09:28:39 -0700945 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200946 /* tie the class to the device */
Tejun Heo5a3ceb82008-08-25 19:50:19 +0200947 klist_add_tail(&dev->knode_class,
948 &dev->class->p->class_devices);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200949
950 /* notify any interfaces that the device is here */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -0700951 list_for_each_entry(class_intf,
952 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200953 if (class_intf->add_dev)
954 class_intf->add_dev(dev, class_intf);
Dave Youngf75b1c62008-05-28 09:28:39 -0700955 mutex_unlock(&dev->class->p->class_mutex);
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700956 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700957done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 put_device(dev);
959 return error;
Alan Stern3b98aea2008-08-07 13:06:12 -0400960 DPMError:
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100961 bus_remove_device(dev);
962 BusError:
James Simmons82f0cf92007-02-21 17:44:51 +0000963 device_remove_attrs(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700964 AttrsError:
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700965 device_remove_class_symlinks(dev);
966 SymlinkError:
Tejun Heoad6a1e12007-06-14 03:45:17 +0900967 if (MAJOR(dev->devt))
Dan Williamse105b8b2008-04-21 10:51:07 -0700968 device_remove_sys_dev_entry(dev);
969 devtattrError:
970 if (MAJOR(dev->devt))
Tejun Heoad6a1e12007-06-14 03:45:17 +0900971 device_remove_file(dev, &devt_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200972 ueventattrError:
Tejun Heoad6a1e12007-06-14 03:45:17 +0900973 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700974 attrError:
Kay Sievers312c0042005-11-16 09:00:00 +0100975 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 kobject_del(&dev->kobj);
977 Error:
Cornelia Huck63b69712008-01-21 16:09:44 +0100978 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (parent)
980 put_device(parent);
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700981 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982}
983
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800985 * device_register - register a device with the system.
986 * @dev: pointer to the device structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800988 * This happens in two clean steps - initialize the device
989 * and add it to the system. The two steps can be called
990 * separately, but this is the easiest and most common.
991 * I.e. you should only call the two helpers separately if
992 * have a clearly defined need to use and refcount the device
993 * before it is added to the hierarchy.
Cornelia Huck57394112008-09-03 18:26:40 +0200994 *
995 * NOTE: _Never_ directly free @dev after calling this function, even
996 * if it returned an error! Always use put_device() to give up the
997 * reference initialized in this function instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999int device_register(struct device *dev)
1000{
1001 device_initialize(dev);
1002 return device_add(dev);
1003}
1004
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001006 * get_device - increment reference count for device.
1007 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001009 * This simply forwards the call to kobject_get(), though
1010 * we do take care to provide for the case that we get a NULL
1011 * pointer passed in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001013struct device *get_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014{
1015 return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
1016}
1017
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001019 * put_device - decrement reference count.
1020 * @dev: device in question.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001022void put_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023{
Kay Sieversedfaa7c2007-05-21 22:08:01 +02001024 /* might_sleep(); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 if (dev)
1026 kobject_put(&dev->kobj);
1027}
1028
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001030 * device_del - delete device from system.
1031 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001033 * This is the first part of the device unregistration
1034 * sequence. This removes the device from the lists we control
1035 * from here, has it removed from the other driver model
1036 * subsystems it was added to in device_add(), and removes it
1037 * from the kobject hierarchy.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001039 * NOTE: this should be called manually _iff_ device_add() was
1040 * also called manually.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001042void device_del(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001044 struct device *parent = dev->parent;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001045 struct class_interface *class_intf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Alan Sternec0676ee2008-12-05 14:10:31 -05001047 /* Notify clients of device removal. This call must come
1048 * before dpm_sysfs_remove().
1049 */
1050 if (dev->bus)
1051 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
1052 BUS_NOTIFY_DEL_DEVICE, dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001053 device_pm_remove(dev);
Alan Stern3b98aea2008-08-07 13:06:12 -04001054 dpm_sysfs_remove(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001056 klist_del(&dev->p->knode_parent);
Dan Williamse105b8b2008-04-21 10:51:07 -07001057 if (MAJOR(dev->devt)) {
1058 device_remove_sys_dev_entry(dev);
Tejun Heoad6a1e12007-06-14 03:45:17 +09001059 device_remove_file(dev, &devt_attr);
Dan Williamse105b8b2008-04-21 10:51:07 -07001060 }
Kay Sieversb9d9c822006-06-15 15:31:56 +02001061 if (dev->class) {
Kay Sieversda231fd2007-11-21 17:29:15 +01001062 device_remove_class_symlinks(dev);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001063
Dave Youngf75b1c62008-05-28 09:28:39 -07001064 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001065 /* notify any interfaces that the device is now gone */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -07001066 list_for_each_entry(class_intf,
1067 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001068 if (class_intf->remove_dev)
1069 class_intf->remove_dev(dev, class_intf);
1070 /* remove the device from the class list */
Tejun Heo5a3ceb82008-08-25 19:50:19 +02001071 klist_del(&dev->knode_class);
Dave Youngf75b1c62008-05-28 09:28:39 -07001072 mutex_unlock(&dev->class->p->class_mutex);
Kay Sieversb9d9c822006-06-15 15:31:56 +02001073 }
Tejun Heoad6a1e12007-06-14 03:45:17 +09001074 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -07001075 device_remove_attrs(dev);
Benjamin Herrenschmidt28953532006-11-08 19:46:14 -08001076 bus_remove_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
Tejun Heo2f8d16a2007-03-09 19:34:19 +09001078 /*
1079 * Some platform devices are driven without driver attached
1080 * and managed resources may have been acquired. Make sure
1081 * all resources are released.
1082 */
1083 devres_release_all(dev);
1084
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 /* Notify the platform of the removal, in case they
1086 * need to do anything...
1087 */
1088 if (platform_notify_remove)
1089 platform_notify_remove(dev);
Kay Sievers312c0042005-11-16 09:00:00 +01001090 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Kay Sieversda231fd2007-11-21 17:29:15 +01001091 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 kobject_del(&dev->kobj);
Kay Sieversda231fd2007-11-21 17:29:15 +01001093 put_device(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094}
1095
1096/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001097 * device_unregister - unregister device from system.
1098 * @dev: device going away.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001100 * We do this in two parts, like we do device_register(). First,
1101 * we remove it from all the subsystems with device_del(), then
1102 * we decrement the reference count via put_device(). If that
1103 * is the final reference count, the device will be cleaned up
1104 * via device_release() above. Otherwise, the structure will
1105 * stick around until the final reference to the device is dropped.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001107void device_unregister(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001109 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 device_del(dev);
1111 put_device(dev);
1112}
1113
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001114static struct device *next_device(struct klist_iter *i)
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001115{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001116 struct klist_node *n = klist_next(i);
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001117 struct device *dev = NULL;
1118 struct device_private *p;
1119
1120 if (n) {
1121 p = to_device_private_parent(n);
1122 dev = p->device;
1123 }
1124 return dev;
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001125}
1126
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001128 * device_for_each_child - device child iterator.
1129 * @parent: parent struct device.
1130 * @data: data for the callback.
1131 * @fn: function to be called for each device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001133 * Iterate over @parent's child devices, and call @fn for each,
1134 * passing it @data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001136 * We check the return of @fn each time. If it returns anything
1137 * other than 0, we break out and return that value.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001139int device_for_each_child(struct device *parent, void *data,
1140 int (*fn)(struct device *dev, void *data))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141{
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001142 struct klist_iter i;
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001143 struct device *child;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 int error = 0;
1145
Greg Kroah-Hartman014c90db2009-04-15 16:00:12 -07001146 if (!parent->p)
1147 return 0;
1148
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001149 klist_iter_init(&parent->p->klist_children, &i);
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001150 while ((child = next_device(&i)) && !error)
1151 error = fn(child, data);
1152 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 return error;
1154}
1155
Cornelia Huck5ab69982006-11-16 15:42:07 +01001156/**
1157 * device_find_child - device iterator for locating a particular device.
1158 * @parent: parent struct device
1159 * @data: Data to pass to match function
1160 * @match: Callback function to check device
1161 *
1162 * This is similar to the device_for_each_child() function above, but it
1163 * returns a reference to a device that is 'found' for later use, as
1164 * determined by the @match callback.
1165 *
1166 * The callback should return 0 if the device doesn't match and non-zero
1167 * if it does. If the callback returns non-zero and a reference to the
1168 * current device can be obtained, this function will return to the caller
1169 * and not iterate over any more devices.
1170 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001171struct device *device_find_child(struct device *parent, void *data,
1172 int (*match)(struct device *dev, void *data))
Cornelia Huck5ab69982006-11-16 15:42:07 +01001173{
1174 struct klist_iter i;
1175 struct device *child;
1176
1177 if (!parent)
1178 return NULL;
1179
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001180 klist_iter_init(&parent->p->klist_children, &i);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001181 while ((child = next_device(&i)))
1182 if (match(child, data) && get_device(child))
1183 break;
1184 klist_iter_exit(&i);
1185 return child;
1186}
1187
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188int __init devices_init(void)
1189{
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -06001190 devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
1191 if (!devices_kset)
1192 return -ENOMEM;
Dan Williamse105b8b2008-04-21 10:51:07 -07001193 dev_kobj = kobject_create_and_add("dev", NULL);
1194 if (!dev_kobj)
1195 goto dev_kobj_err;
1196 sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
1197 if (!sysfs_dev_block_kobj)
1198 goto block_kobj_err;
1199 sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
1200 if (!sysfs_dev_char_kobj)
1201 goto char_kobj_err;
1202
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -06001203 return 0;
Dan Williamse105b8b2008-04-21 10:51:07 -07001204
1205 char_kobj_err:
1206 kobject_put(sysfs_dev_block_kobj);
1207 block_kobj_err:
1208 kobject_put(dev_kobj);
1209 dev_kobj_err:
1210 kset_unregister(devices_kset);
1211 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212}
1213
1214EXPORT_SYMBOL_GPL(device_for_each_child);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001215EXPORT_SYMBOL_GPL(device_find_child);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216
1217EXPORT_SYMBOL_GPL(device_initialize);
1218EXPORT_SYMBOL_GPL(device_add);
1219EXPORT_SYMBOL_GPL(device_register);
1220
1221EXPORT_SYMBOL_GPL(device_del);
1222EXPORT_SYMBOL_GPL(device_unregister);
1223EXPORT_SYMBOL_GPL(get_device);
1224EXPORT_SYMBOL_GPL(put_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225
1226EXPORT_SYMBOL_GPL(device_create_file);
1227EXPORT_SYMBOL_GPL(device_remove_file);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001228
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001229struct root_device
1230{
1231 struct device dev;
1232 struct module *owner;
1233};
1234
1235#define to_root_device(dev) container_of(dev, struct root_device, dev)
1236
1237static void root_device_release(struct device *dev)
1238{
1239 kfree(to_root_device(dev));
1240}
1241
1242/**
1243 * __root_device_register - allocate and register a root device
1244 * @name: root device name
1245 * @owner: owner module of the root device, usually THIS_MODULE
1246 *
1247 * This function allocates a root device and registers it
1248 * using device_register(). In order to free the returned
1249 * device, use root_device_unregister().
1250 *
1251 * Root devices are dummy devices which allow other devices
1252 * to be grouped under /sys/devices. Use this function to
1253 * allocate a root device and then use it as the parent of
1254 * any device which should appear under /sys/devices/{name}
1255 *
1256 * The /sys/devices/{name} directory will also contain a
1257 * 'module' symlink which points to the @owner directory
1258 * in sysfs.
1259 *
1260 * Note: You probably want to use root_device_register().
1261 */
1262struct device *__root_device_register(const char *name, struct module *owner)
1263{
1264 struct root_device *root;
1265 int err = -ENOMEM;
1266
1267 root = kzalloc(sizeof(struct root_device), GFP_KERNEL);
1268 if (!root)
1269 return ERR_PTR(err);
1270
1271 err = dev_set_name(&root->dev, name);
1272 if (err) {
1273 kfree(root);
1274 return ERR_PTR(err);
1275 }
1276
1277 root->dev.release = root_device_release;
1278
1279 err = device_register(&root->dev);
1280 if (err) {
1281 put_device(&root->dev);
1282 return ERR_PTR(err);
1283 }
1284
1285#ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */
1286 if (owner) {
1287 struct module_kobject *mk = &owner->mkobj;
1288
1289 err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module");
1290 if (err) {
1291 device_unregister(&root->dev);
1292 return ERR_PTR(err);
1293 }
1294 root->owner = owner;
1295 }
1296#endif
1297
1298 return &root->dev;
1299}
1300EXPORT_SYMBOL_GPL(__root_device_register);
1301
1302/**
1303 * root_device_unregister - unregister and free a root device
Randy Dunlap7cbcf222009-01-20 16:29:13 -08001304 * @dev: device going away
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001305 *
1306 * This function unregisters and cleans up a device that was created by
1307 * root_device_register().
1308 */
1309void root_device_unregister(struct device *dev)
1310{
1311 struct root_device *root = to_root_device(dev);
1312
1313 if (root->owner)
1314 sysfs_remove_link(&root->dev.kobj, "module");
1315
1316 device_unregister(dev);
1317}
1318EXPORT_SYMBOL_GPL(root_device_unregister);
1319
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001320
1321static void device_create_release(struct device *dev)
1322{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001323 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001324 kfree(dev);
1325}
1326
1327/**
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001328 * device_create_vargs - creates a device and registers it with sysfs
1329 * @class: pointer to the struct class that this device should be registered to
1330 * @parent: pointer to the parent struct device of this new device, if any
1331 * @devt: the dev_t for the char device to be added
1332 * @drvdata: the data to be added to the device for callbacks
1333 * @fmt: string for the device's name
1334 * @args: va_list for the device's name
1335 *
1336 * This function can be used by char device classes. A struct device
1337 * will be created in sysfs, registered to the specified class.
1338 *
1339 * A "dev" file will be created, showing the dev_t for the device, if
1340 * the dev_t is not 0,0.
1341 * If a pointer to a parent struct device is passed in, the newly created
1342 * struct device will be a child of that device in sysfs.
1343 * The pointer to the struct device will be returned from the call.
1344 * Any further sysfs files that might be required can be created using this
1345 * pointer.
1346 *
1347 * Note: the struct class passed to this function must have previously
1348 * been created with a call to class_create().
1349 */
1350struct device *device_create_vargs(struct class *class, struct device *parent,
1351 dev_t devt, void *drvdata, const char *fmt,
1352 va_list args)
1353{
1354 struct device *dev = NULL;
1355 int retval = -ENODEV;
1356
1357 if (class == NULL || IS_ERR(class))
1358 goto error;
1359
1360 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1361 if (!dev) {
1362 retval = -ENOMEM;
1363 goto error;
1364 }
1365
1366 dev->devt = devt;
1367 dev->class = class;
1368 dev->parent = parent;
1369 dev->release = device_create_release;
1370 dev_set_drvdata(dev, drvdata);
1371
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001372 retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
1373 if (retval)
1374 goto error;
1375
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001376 retval = device_register(dev);
1377 if (retval)
1378 goto error;
1379
1380 return dev;
1381
1382error:
Cornelia Huck286661b2008-09-03 18:26:41 +02001383 put_device(dev);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001384 return ERR_PTR(retval);
1385}
1386EXPORT_SYMBOL_GPL(device_create_vargs);
1387
1388/**
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001389 * device_create - creates a device and registers it with sysfs
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001390 * @class: pointer to the struct class that this device should be registered to
1391 * @parent: pointer to the parent struct device of this new device, if any
1392 * @devt: the dev_t for the char device to be added
1393 * @drvdata: the data to be added to the device for callbacks
1394 * @fmt: string for the device's name
1395 *
1396 * This function can be used by char device classes. A struct device
1397 * will be created in sysfs, registered to the specified class.
1398 *
1399 * A "dev" file will be created, showing the dev_t for the device, if
1400 * the dev_t is not 0,0.
1401 * If a pointer to a parent struct device is passed in, the newly created
1402 * struct device will be a child of that device in sysfs.
1403 * The pointer to the struct device will be returned from the call.
1404 * Any further sysfs files that might be required can be created using this
1405 * pointer.
1406 *
1407 * Note: the struct class passed to this function must have previously
1408 * been created with a call to class_create().
1409 */
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001410struct device *device_create(struct class *class, struct device *parent,
1411 dev_t devt, void *drvdata, const char *fmt, ...)
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001412{
1413 va_list vargs;
1414 struct device *dev;
1415
1416 va_start(vargs, fmt);
1417 dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
1418 va_end(vargs);
1419 return dev;
1420}
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001421EXPORT_SYMBOL_GPL(device_create);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001422
Dave Youngcd354492008-01-28 16:56:11 +08001423static int __match_devt(struct device *dev, void *data)
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001424{
Dave Youngcd354492008-01-28 16:56:11 +08001425 dev_t *devt = data;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001426
Dave Youngcd354492008-01-28 16:56:11 +08001427 return dev->devt == *devt;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001428}
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001429
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001430/**
1431 * device_destroy - removes a device that was created with device_create()
1432 * @class: pointer to the struct class that this device was registered with
1433 * @devt: the dev_t of the device that was previously registered
1434 *
1435 * This call unregisters and cleans up a device that was created with a
1436 * call to device_create().
1437 */
1438void device_destroy(struct class *class, dev_t devt)
1439{
1440 struct device *dev;
1441
Greg Kroah-Hartman695794a2008-05-22 17:21:08 -04001442 dev = class_find_device(class, NULL, &devt, __match_devt);
Dave Youngcd354492008-01-28 16:56:11 +08001443 if (dev) {
1444 put_device(dev);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001445 device_unregister(dev);
Dave Youngcd354492008-01-28 16:56:11 +08001446 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001447}
1448EXPORT_SYMBOL_GPL(device_destroy);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001449
1450/**
1451 * device_rename - renames a device
1452 * @dev: the pointer to the struct device to be renamed
1453 * @new_name: the new name of the device
Eric W. Biederman030c1d22008-05-08 14:41:00 -07001454 *
1455 * It is the responsibility of the caller to provide mutual
1456 * exclusion between two different calls of device_rename
1457 * on the same device to ensure that new_name is valid and
1458 * won't conflict with other devices.
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001459 */
1460int device_rename(struct device *dev, char *new_name)
1461{
1462 char *old_class_name = NULL;
1463 char *new_class_name = NULL;
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001464 char *old_device_name = NULL;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001465 int error;
1466
1467 dev = get_device(dev);
1468 if (!dev)
1469 return -EINVAL;
1470
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001471 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -08001472 __func__, new_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001473
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001474#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001475 if ((dev->class) && (dev->parent))
1476 old_class_name = make_class_name(dev->class->name, &dev->kobj);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001477#endif
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001478
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001479 old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001480 if (!old_device_name) {
1481 error = -ENOMEM;
1482 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001483 }
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001484
1485 error = kobject_rename(&dev->kobj, new_name);
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001486 if (error)
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001487 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001488
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001489#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001490 if (old_class_name) {
1491 new_class_name = make_class_name(dev->class->name, &dev->kobj);
1492 if (new_class_name) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001493 error = sysfs_create_link_nowarn(&dev->parent->kobj,
1494 &dev->kobj,
1495 new_class_name);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001496 if (error)
1497 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001498 sysfs_remove_link(&dev->parent->kobj, old_class_name);
1499 }
1500 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001501#else
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001502 if (dev->class) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001503 error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001504 &dev->kobj, dev_name(dev));
Stephen Hemminger0599ad52008-05-14 22:34:16 -07001505 if (error)
1506 goto out;
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -07001507 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -05001508 old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001509 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001510#endif
1511
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001512out:
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001513 put_device(dev);
1514
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001515 kfree(new_class_name);
Jesper Juhl952ab432006-09-28 23:56:01 +02001516 kfree(old_class_name);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001517 kfree(old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001518
1519 return error;
1520}
Johannes Berga2807db2007-02-28 12:38:31 +01001521EXPORT_SYMBOL_GPL(device_rename);
Cornelia Huck8a824722006-11-20 17:07:51 +01001522
1523static int device_move_class_links(struct device *dev,
1524 struct device *old_parent,
1525 struct device *new_parent)
1526{
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001527 int error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001528#ifdef CONFIG_SYSFS_DEPRECATED
Cornelia Huck8a824722006-11-20 17:07:51 +01001529 char *class_name;
1530
1531 class_name = make_class_name(dev->class->name, &dev->kobj);
1532 if (!class_name) {
Cornelia Huckcb360bb2006-11-27 10:35:05 +01001533 error = -ENOMEM;
Cornelia Huck8a824722006-11-20 17:07:51 +01001534 goto out;
1535 }
1536 if (old_parent) {
1537 sysfs_remove_link(&dev->kobj, "device");
1538 sysfs_remove_link(&old_parent->kobj, class_name);
1539 }
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001540 if (new_parent) {
1541 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1542 "device");
1543 if (error)
1544 goto out;
1545 error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
1546 class_name);
1547 if (error)
1548 sysfs_remove_link(&dev->kobj, "device");
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001549 } else
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001550 error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001551out:
1552 kfree(class_name);
1553 return error;
1554#else
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001555 if (old_parent)
1556 sysfs_remove_link(&dev->kobj, "device");
1557 if (new_parent)
1558 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1559 "device");
1560 return error;
Cornelia Huck8a824722006-11-20 17:07:51 +01001561#endif
1562}
1563
1564/**
1565 * device_move - moves a device to a new parent
1566 * @dev: the pointer to the struct device to be moved
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001567 * @new_parent: the new parent of the device (can by NULL)
Cornelia Huckffa6a702009-03-04 12:44:00 +01001568 * @dpm_order: how to reorder the dpm_list
Cornelia Huck8a824722006-11-20 17:07:51 +01001569 */
Cornelia Huckffa6a702009-03-04 12:44:00 +01001570int device_move(struct device *dev, struct device *new_parent,
1571 enum dpm_order dpm_order)
Cornelia Huck8a824722006-11-20 17:07:51 +01001572{
1573 int error;
1574 struct device *old_parent;
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001575 struct kobject *new_parent_kobj;
Cornelia Huck8a824722006-11-20 17:07:51 +01001576
1577 dev = get_device(dev);
1578 if (!dev)
1579 return -EINVAL;
1580
Cornelia Huckffa6a702009-03-04 12:44:00 +01001581 device_pm_lock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001582 new_parent = get_device(new_parent);
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001583 new_parent_kobj = get_device_parent(dev, new_parent);
Cornelia Huck63b69712008-01-21 16:09:44 +01001584
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001585 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
1586 __func__, new_parent ? dev_name(new_parent) : "<NULL>");
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001587 error = kobject_move(&dev->kobj, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001588 if (error) {
Cornelia Huck63b69712008-01-21 16:09:44 +01001589 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001590 put_device(new_parent);
1591 goto out;
1592 }
1593 old_parent = dev->parent;
1594 dev->parent = new_parent;
1595 if (old_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001596 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001597 if (new_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001598 klist_add_tail(&dev->p->knode_parent,
1599 &new_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001600 set_dev_node(dev, dev_to_node(new_parent));
1601 }
1602
Cornelia Huck8a824722006-11-20 17:07:51 +01001603 if (!dev->class)
1604 goto out_put;
1605 error = device_move_class_links(dev, old_parent, new_parent);
1606 if (error) {
1607 /* We ignore errors on cleanup since we're hosed anyway... */
1608 device_move_class_links(dev, new_parent, old_parent);
1609 if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001610 if (new_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001611 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001612 dev->parent = old_parent;
1613 if (old_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001614 klist_add_tail(&dev->p->knode_parent,
1615 &old_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001616 set_dev_node(dev, dev_to_node(old_parent));
1617 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001618 }
Cornelia Huck63b69712008-01-21 16:09:44 +01001619 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001620 put_device(new_parent);
1621 goto out;
1622 }
Cornelia Huckffa6a702009-03-04 12:44:00 +01001623 switch (dpm_order) {
1624 case DPM_ORDER_NONE:
1625 break;
1626 case DPM_ORDER_DEV_AFTER_PARENT:
1627 device_pm_move_after(dev, new_parent);
1628 break;
1629 case DPM_ORDER_PARENT_BEFORE_DEV:
1630 device_pm_move_before(new_parent, dev);
1631 break;
1632 case DPM_ORDER_DEV_LAST:
1633 device_pm_move_last(dev);
1634 break;
1635 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001636out_put:
1637 put_device(old_parent);
1638out:
Cornelia Huckffa6a702009-03-04 12:44:00 +01001639 device_pm_unlock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001640 put_device(dev);
1641 return error;
1642}
Cornelia Huck8a824722006-11-20 17:07:51 +01001643EXPORT_SYMBOL_GPL(device_move);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001644
1645/**
1646 * device_shutdown - call ->shutdown() on each device to shutdown.
1647 */
1648void device_shutdown(void)
1649{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001650 struct device *dev, *devn;
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001651
1652 list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
1653 kobj.entry) {
1654 if (dev->bus && dev->bus->shutdown) {
1655 dev_dbg(dev, "shutdown\n");
1656 dev->bus->shutdown(dev);
1657 } else if (dev->driver && dev->driver->shutdown) {
1658 dev_dbg(dev, "shutdown\n");
1659 dev->driver->shutdown(dev);
1660 }
1661 }
Dan Williamse105b8b2008-04-21 10:51:07 -07001662 kobject_put(sysfs_dev_char_kobj);
1663 kobject_put(sysfs_dev_block_kobj);
1664 kobject_put(dev_kobj);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001665}