blob: ee555d7d5c3f6d73018491f1ad6802b49548bc46 [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-Hartman2831fe62008-12-16 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-Hartman2831fe62008-12-16 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);
Cornelia Huck83b5fb4c2007-03-29 11:12:11 +0200139 if (dev->uevent_suppress)
140 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 if (dev->bus)
142 return 1;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700143 if (dev->class)
144 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 }
146 return 0;
147}
148
Kay Sievers312c0042005-11-16 09:00:00 +0100149static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
151 struct device *dev = to_dev(kobj);
152
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700153 if (dev->bus)
154 return dev->bus->name;
155 if (dev->class)
156 return dev->class->name;
157 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158}
159
Kay Sievers7eff2e72007-08-14 15:15:12 +0200160static int dev_uevent(struct kset *kset, struct kobject *kobj,
161 struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 struct device *dev = to_dev(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 int retval = 0;
165
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700166 /* add the major/minor if present */
167 if (MAJOR(dev->devt)) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200168 add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
169 add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700170 }
171
Kay Sievers414264f2007-03-12 21:08:57 +0100172 if (dev->type && dev->type->name)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200173 add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
Kay Sievers414264f2007-03-12 21:08:57 +0100174
Kay Sievers239378f2006-10-07 21:54:55 +0200175 if (dev->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200176 add_uevent_var(env, "DRIVER=%s", dev->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200177
Kay Sieversa87cb2a2006-09-14 11:23:28 +0200178#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sievers239378f2006-10-07 21:54:55 +0200179 if (dev->class) {
180 struct device *parent = dev->parent;
181
182 /* find first bus device in parent chain */
183 while (parent && !parent->bus)
184 parent = parent->parent;
185 if (parent && parent->bus) {
186 const char *path;
187
188 path = kobject_get_path(&parent->kobj, GFP_KERNEL);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200189 if (path) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200190 add_uevent_var(env, "PHYSDEVPATH=%s", path);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200191 kfree(path);
192 }
Kay Sievers239378f2006-10-07 21:54:55 +0200193
Kay Sievers7eff2e72007-08-14 15:15:12 +0200194 add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200195
196 if (parent->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200197 add_uevent_var(env, "PHYSDEVDRIVER=%s",
198 parent->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200199 }
200 } else if (dev->bus) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200201 add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200202
203 if (dev->driver)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800204 add_uevent_var(env, "PHYSDEVDRIVER=%s",
205 dev->driver->name);
Kay Sieversd81d9d62006-08-13 06:17:09 +0200206 }
Kay Sievers239378f2006-10-07 21:54:55 +0200207#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
Kay Sievers7eff2e72007-08-14 15:15:12 +0200209 /* have the bus specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100210 if (dev->bus && dev->bus->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200211 retval = dev->bus->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200212 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800213 pr_debug("device: '%s': %s: bus uevent() returned %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100214 dev_name(dev), __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
216
Kay Sievers7eff2e72007-08-14 15:15:12 +0200217 /* have the class specific function add its stuff */
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700218 if (dev->class && dev->class->dev_uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200219 retval = dev->class->dev_uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200220 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800221 pr_debug("device: '%s': %s: class uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100222 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800223 __func__, retval);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200224 }
225
Kay Sievers7eff2e72007-08-14 15:15:12 +0200226 /* have the device type specific fuction add its stuff */
Kay Sieversf9f852d2006-10-07 21:54:55 +0200227 if (dev->type && dev->type->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200228 retval = dev->type->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200229 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800230 pr_debug("device: '%s': %s: dev_type uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100231 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800232 __func__, retval);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700233 }
234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 return retval;
236}
237
Kay Sievers312c0042005-11-16 09:00:00 +0100238static struct kset_uevent_ops device_uevent_ops = {
239 .filter = dev_uevent_filter,
240 .name = dev_uevent_name,
241 .uevent = dev_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242};
243
Kay Sievers16574dc2007-04-06 01:40:38 +0200244static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
245 char *buf)
246{
247 struct kobject *top_kobj;
248 struct kset *kset;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200249 struct kobj_uevent_env *env = NULL;
Kay Sievers16574dc2007-04-06 01:40:38 +0200250 int i;
251 size_t count = 0;
252 int retval;
253
254 /* search the kset, the device belongs to */
255 top_kobj = &dev->kobj;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200256 while (!top_kobj->kset && top_kobj->parent)
257 top_kobj = top_kobj->parent;
Kay Sievers16574dc2007-04-06 01:40:38 +0200258 if (!top_kobj->kset)
259 goto out;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200260
Kay Sievers16574dc2007-04-06 01:40:38 +0200261 kset = top_kobj->kset;
262 if (!kset->uevent_ops || !kset->uevent_ops->uevent)
263 goto out;
264
265 /* respect filter */
266 if (kset->uevent_ops && kset->uevent_ops->filter)
267 if (!kset->uevent_ops->filter(kset, &dev->kobj))
268 goto out;
269
Kay Sievers7eff2e72007-08-14 15:15:12 +0200270 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
271 if (!env)
Greg Kroah-Hartmanc7308c82007-05-02 14:14:11 +0200272 return -ENOMEM;
273
Kay Sievers16574dc2007-04-06 01:40:38 +0200274 /* let the kset specific function add its keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200275 retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200276 if (retval)
277 goto out;
278
279 /* copy keys to file */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200280 for (i = 0; i < env->envp_idx; i++)
281 count += sprintf(&buf[count], "%s\n", env->envp[i]);
Kay Sievers16574dc2007-04-06 01:40:38 +0200282out:
Kay Sievers7eff2e72007-08-14 15:15:12 +0200283 kfree(env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200284 return count;
285}
286
Kay Sieversa7fd6702005-10-01 14:49:43 +0200287static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
288 const char *buf, size_t count)
289{
Kay Sievers60a96a52007-07-08 22:29:26 +0200290 enum kobject_action action;
291
Kay Sievers5c5daf62007-08-12 20:43:55 +0200292 if (kobject_action_type(buf, count, &action) == 0) {
Kay Sievers60a96a52007-07-08 22:29:26 +0200293 kobject_uevent(&dev->kobj, action);
294 goto out;
295 }
296
297 dev_err(dev, "uevent: unsupported action-string; this will "
298 "be ignored in a future kernel version\n");
Kay Sievers312c0042005-11-16 09:00:00 +0100299 kobject_uevent(&dev->kobj, KOBJ_ADD);
Kay Sievers60a96a52007-07-08 22:29:26 +0200300out:
Kay Sieversa7fd6702005-10-01 14:49:43 +0200301 return count;
302}
303
Tejun Heoad6a1e12007-06-14 03:45:17 +0900304static struct device_attribute uevent_attr =
305 __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
306
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500307static int device_add_attributes(struct device *dev,
308 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700309{
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700310 int error = 0;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500311 int i;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700312
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500313 if (attrs) {
314 for (i = 0; attr_name(attrs[i]); i++) {
315 error = device_create_file(dev, &attrs[i]);
316 if (error)
317 break;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700318 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500319 if (error)
320 while (--i >= 0)
321 device_remove_file(dev, &attrs[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700322 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700323 return error;
324}
325
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500326static void device_remove_attributes(struct device *dev,
327 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700328{
329 int i;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500330
331 if (attrs)
332 for (i = 0; attr_name(attrs[i]); i++)
333 device_remove_file(dev, &attrs[i]);
334}
335
336static int device_add_groups(struct device *dev,
337 struct attribute_group **groups)
338{
339 int error = 0;
340 int i;
341
342 if (groups) {
343 for (i = 0; groups[i]; i++) {
344 error = sysfs_create_group(&dev->kobj, groups[i]);
345 if (error) {
346 while (--i >= 0)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800347 sysfs_remove_group(&dev->kobj,
348 groups[i]);
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500349 break;
350 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700351 }
352 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500353 return error;
354}
355
356static void device_remove_groups(struct device *dev,
357 struct attribute_group **groups)
358{
359 int i;
360
361 if (groups)
362 for (i = 0; groups[i]; i++)
363 sysfs_remove_group(&dev->kobj, groups[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700364}
365
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700366static int device_add_attrs(struct device *dev)
367{
368 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200369 struct device_type *type = dev->type;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500370 int error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700371
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500372 if (class) {
373 error = device_add_attributes(dev, class->dev_attrs);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200374 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500375 return error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700376 }
Kay Sieversf9f852d2006-10-07 21:54:55 +0200377
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500378 if (type) {
379 error = device_add_groups(dev, type->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200380 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500381 goto err_remove_class_attrs;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200382 }
383
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500384 error = device_add_groups(dev, dev->groups);
385 if (error)
386 goto err_remove_type_groups;
387
388 return 0;
389
390 err_remove_type_groups:
391 if (type)
392 device_remove_groups(dev, type->groups);
393 err_remove_class_attrs:
394 if (class)
395 device_remove_attributes(dev, class->dev_attrs);
396
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700397 return error;
398}
399
400static void device_remove_attrs(struct device *dev)
401{
402 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200403 struct device_type *type = dev->type;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700404
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500405 device_remove_groups(dev, dev->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200406
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500407 if (type)
408 device_remove_groups(dev, type->groups);
409
410 if (class)
411 device_remove_attributes(dev, class->dev_attrs);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700412}
413
414
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700415static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
416 char *buf)
417{
418 return print_dev_t(buf, dev->devt);
419}
420
Tejun Heoad6a1e12007-06-14 03:45:17 +0900421static struct device_attribute devt_attr =
422 __ATTR(dev, S_IRUGO, show_dev, NULL);
423
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -0600424/* kset to create /sys/devices/ */
425struct kset *devices_kset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800428 * device_create_file - create sysfs attribute file for device.
429 * @dev: device.
430 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800432int device_create_file(struct device *dev, struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433{
434 int error = 0;
Cornelia Huck0c98b192008-01-31 10:39:38 +0100435 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 error = sysfs_create_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return error;
438}
439
440/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800441 * device_remove_file - remove sysfs attribute file.
442 * @dev: device.
443 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800445void device_remove_file(struct device *dev, struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446{
Cornelia Huck0c98b192008-01-31 10:39:38 +0100447 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 sysfs_remove_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449}
450
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700451/**
452 * device_create_bin_file - create sysfs binary attribute file for device.
453 * @dev: device.
454 * @attr: device binary attribute descriptor.
455 */
456int device_create_bin_file(struct device *dev, struct bin_attribute *attr)
457{
458 int error = -EINVAL;
459 if (dev)
460 error = sysfs_create_bin_file(&dev->kobj, attr);
461 return error;
462}
463EXPORT_SYMBOL_GPL(device_create_bin_file);
464
465/**
466 * device_remove_bin_file - remove sysfs binary attribute file
467 * @dev: device.
468 * @attr: device binary attribute descriptor.
469 */
470void device_remove_bin_file(struct device *dev, struct bin_attribute *attr)
471{
472 if (dev)
473 sysfs_remove_bin_file(&dev->kobj, attr);
474}
475EXPORT_SYMBOL_GPL(device_remove_bin_file);
476
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400477/**
Alan Stern523ded72007-04-26 00:12:04 -0700478 * device_schedule_callback_owner - helper to schedule a callback for a device
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400479 * @dev: device.
480 * @func: callback function to invoke later.
Alan Stern523ded72007-04-26 00:12:04 -0700481 * @owner: module owning the callback routine
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400482 *
483 * Attribute methods must not unregister themselves or their parent device
484 * (which would amount to the same thing). Attempts to do so will deadlock,
485 * since unregistration is mutually exclusive with driver callbacks.
486 *
487 * Instead methods can call this routine, which will attempt to allocate
488 * and schedule a workqueue request to call back @func with @dev as its
489 * argument in the workqueue's process context. @dev will be pinned until
490 * @func returns.
491 *
Alan Stern523ded72007-04-26 00:12:04 -0700492 * This routine is usually called via the inline device_schedule_callback(),
493 * which automatically sets @owner to THIS_MODULE.
494 *
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400495 * Returns 0 if the request was submitted, -ENOMEM if storage could not
Alan Stern523ded72007-04-26 00:12:04 -0700496 * be allocated, -ENODEV if a reference to @owner isn't available.
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400497 *
498 * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
499 * underlying sysfs routine (since it is intended for use by attribute
500 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
501 */
Alan Stern523ded72007-04-26 00:12:04 -0700502int device_schedule_callback_owner(struct device *dev,
503 void (*func)(struct device *), struct module *owner)
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400504{
505 return sysfs_schedule_callback(&dev->kobj,
Alan Stern523ded72007-04-26 00:12:04 -0700506 (void (*)(void *)) func, dev, owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400507}
Alan Stern523ded72007-04-26 00:12:04 -0700508EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400509
James Bottomley34bb61f2005-09-06 16:56:51 -0700510static void klist_children_get(struct klist_node *n)
511{
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -0800512 struct device_private *p = to_device_private_parent(n);
513 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700514
515 get_device(dev);
516}
517
518static void klist_children_put(struct klist_node *n)
519{
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -0800520 struct device_private *p = to_device_private_parent(n);
521 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700522
523 put_device(dev);
524}
525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800527 * device_initialize - init device structure.
528 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 *
Cornelia Huck57394112008-09-03 18:26:40 +0200530 * This prepares the device for use by other layers by initializing
531 * its fields.
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800532 * It is the first half of device_register(), if called by
Cornelia Huck57394112008-09-03 18:26:40 +0200533 * that function, though it can also be called separately, so one
534 * may use @dev's fields. In particular, get_device()/put_device()
535 * may be used for reference counting of @dev after calling this
536 * function.
537 *
538 * NOTE: Use put_device() to give up your reference instead of freeing
539 * @dev directly once you have called this function.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541void device_initialize(struct device *dev)
542{
Greg Kroah-Hartman2831fe62008-12-16 12:23:36 -0800543 dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
544 if (!dev->p) {
545 WARN_ON(1);
546 return;
547 }
548 dev->p->device = dev;
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -0600549 dev->kobj.kset = devices_kset;
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700550 kobject_init(&dev->kobj, &device_ktype);
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -0800551 klist_init(&dev->p->klist_children, klist_children_get,
James Bottomley34bb61f2005-09-06 16:56:51 -0700552 klist_children_put);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 INIT_LIST_HEAD(&dev->dma_pools);
mochel@digitalimplant.orgaf703162005-03-21 10:41:04 -0800554 init_MUTEX(&dev->sem);
Tejun Heo9ac78492007-01-20 16:00:26 +0900555 spin_lock_init(&dev->devres_lock);
556 INIT_LIST_HEAD(&dev->devres_head);
David Brownell0ac85242005-09-12 19:39:34 -0700557 device_init_wakeup(dev, 0);
Alan Stern3b98aea2008-08-07 13:06:12 -0400558 device_pm_init(dev);
Christoph Hellwig87348132006-12-06 20:32:33 -0800559 set_dev_node(dev, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100562#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sieversda231fd2007-11-21 17:29:15 +0100563static struct kobject *get_device_parent(struct device *dev,
564 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100565{
Kay Sieversda231fd2007-11-21 17:29:15 +0100566 /* class devices without a parent live in /sys/class/<classname>/ */
Dmitry Torokhov3eb215d2007-10-07 12:22:21 -0400567 if (dev->class && (!parent || parent->class != dev->class))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700568 return &dev->class->p->class_subsys.kobj;
Kay Sieversda231fd2007-11-21 17:29:15 +0100569 /* all other devices keep their parent */
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100570 else if (parent)
Cornelia Huckc744aea2007-01-08 20:16:44 +0100571 return &parent->kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100572
Cornelia Huckc744aea2007-01-08 20:16:44 +0100573 return NULL;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100574}
Kay Sieversda231fd2007-11-21 17:29:15 +0100575
576static inline void cleanup_device_parent(struct device *dev) {}
Cornelia Huck63b69712008-01-21 16:09:44 +0100577static inline void cleanup_glue_dir(struct device *dev,
578 struct kobject *glue_dir) {}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100579#else
Kay Sievers86406242007-03-14 03:25:56 +0100580static struct kobject *virtual_device_parent(struct device *dev)
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700581{
Kay Sievers86406242007-03-14 03:25:56 +0100582 static struct kobject *virtual_dir = NULL;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700583
Kay Sievers86406242007-03-14 03:25:56 +0100584 if (!virtual_dir)
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -0800585 virtual_dir = kobject_create_and_add("virtual",
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -0600586 &devices_kset->kobj);
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700587
Kay Sievers86406242007-03-14 03:25:56 +0100588 return virtual_dir;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700589}
590
Kay Sieversda231fd2007-11-21 17:29:15 +0100591static struct kobject *get_device_parent(struct device *dev,
592 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100593{
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800594 int retval;
595
Kay Sievers86406242007-03-14 03:25:56 +0100596 if (dev->class) {
597 struct kobject *kobj = NULL;
598 struct kobject *parent_kobj;
599 struct kobject *k;
600
601 /*
602 * If we have no parent, we live in "virtual".
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100603 * Class-devices with a non class-device as parent, live
604 * in a "glue" directory to prevent namespace collisions.
Kay Sievers86406242007-03-14 03:25:56 +0100605 */
606 if (parent == NULL)
607 parent_kobj = virtual_device_parent(dev);
608 else if (parent->class)
609 return &parent->kobj;
610 else
611 parent_kobj = &parent->kobj;
612
613 /* find our class-directory at the parent and reference it */
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500614 spin_lock(&dev->class->p->class_dirs.list_lock);
615 list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
Kay Sievers86406242007-03-14 03:25:56 +0100616 if (k->parent == parent_kobj) {
617 kobj = kobject_get(k);
618 break;
619 }
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500620 spin_unlock(&dev->class->p->class_dirs.list_lock);
Kay Sievers86406242007-03-14 03:25:56 +0100621 if (kobj)
622 return kobj;
623
624 /* or create a new class-directory at the parent device */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800625 k = kobject_create();
626 if (!k)
627 return NULL;
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500628 k->kset = &dev->class->p->class_dirs;
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700629 retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800630 if (retval < 0) {
631 kobject_put(k);
632 return NULL;
633 }
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100634 /* do not emit an uevent for this simple "glue" directory */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800635 return k;
Kay Sievers86406242007-03-14 03:25:56 +0100636 }
637
638 if (parent)
Cornelia Huckc744aea2007-01-08 20:16:44 +0100639 return &parent->kobj;
640 return NULL;
641}
Kay Sieversda231fd2007-11-21 17:29:15 +0100642
Cornelia Huck63b69712008-01-21 16:09:44 +0100643static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
Kay Sieversda231fd2007-11-21 17:29:15 +0100644{
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100645 /* see if we live in a "glue" directory */
Cornelia Huckc1fe5392008-02-27 15:38:23 +0100646 if (!glue_dir || !dev->class ||
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500647 glue_dir->kset != &dev->class->p->class_dirs)
Kay Sieversda231fd2007-11-21 17:29:15 +0100648 return;
649
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100650 kobject_put(glue_dir);
Kay Sieversda231fd2007-11-21 17:29:15 +0100651}
Cornelia Huck63b69712008-01-21 16:09:44 +0100652
653static void cleanup_device_parent(struct device *dev)
654{
655 cleanup_glue_dir(dev, dev->kobj.parent);
656}
Cornelia Huckc744aea2007-01-08 20:16:44 +0100657#endif
Kay Sievers86406242007-03-14 03:25:56 +0100658
Cornelia Huck63b69712008-01-21 16:09:44 +0100659static void setup_parent(struct device *dev, struct device *parent)
Cornelia Huckc744aea2007-01-08 20:16:44 +0100660{
661 struct kobject *kobj;
662 kobj = get_device_parent(dev, parent);
Cornelia Huckc744aea2007-01-08 20:16:44 +0100663 if (kobj)
664 dev->kobj.parent = kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100665}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100666
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700667static int device_add_class_symlinks(struct device *dev)
668{
669 int error;
670
671 if (!dev->class)
672 return 0;
Kay Sieversda231fd2007-11-21 17:29:15 +0100673
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700674 error = sysfs_create_link(&dev->kobj,
675 &dev->class->p->class_subsys.kobj,
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700676 "subsystem");
677 if (error)
678 goto out;
Kay Sieversda231fd2007-11-21 17:29:15 +0100679
680#ifdef CONFIG_SYSFS_DEPRECATED
681 /* stacked class devices need a symlink in the class directory */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700682 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800683 device_is_not_partition(dev)) {
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700684 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100685 &dev->kobj, dev_name(dev));
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700686 if (error)
687 goto out_subsys;
688 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100689
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800690 if (dev->parent && device_is_not_partition(dev)) {
Kay Sieversda231fd2007-11-21 17:29:15 +0100691 struct device *parent = dev->parent;
692 char *class_name;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700693
Kay Sieversda231fd2007-11-21 17:29:15 +0100694 /*
695 * stacked class devices have the 'device' link
696 * pointing to the bus device instead of the parent
697 */
698 while (parent->class && !parent->bus && parent->parent)
699 parent = parent->parent;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700700
Kay Sieversda231fd2007-11-21 17:29:15 +0100701 error = sysfs_create_link(&dev->kobj,
702 &parent->kobj,
703 "device");
704 if (error)
705 goto out_busid;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700706
Kay Sieversda231fd2007-11-21 17:29:15 +0100707 class_name = make_class_name(dev->class->name,
708 &dev->kobj);
709 if (class_name)
710 error = sysfs_create_link(&dev->parent->kobj,
711 &dev->kobj, class_name);
712 kfree(class_name);
713 if (error)
714 goto out_device;
715 }
716 return 0;
717
718out_device:
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800719 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100720 sysfs_remove_link(&dev->kobj, "device");
721out_busid:
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700722 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800723 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700724 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100725 dev_name(dev));
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700726#else
Kay Sieversda231fd2007-11-21 17:29:15 +0100727 /* link in the class directory pointing to the device */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700728 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100729 &dev->kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100730 if (error)
731 goto out_subsys;
732
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800733 if (dev->parent && device_is_not_partition(dev)) {
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700734 error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
735 "device");
736 if (error)
737 goto out_busid;
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700738 }
739 return 0;
740
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700741out_busid:
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100742 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100743#endif
744
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700745out_subsys:
746 sysfs_remove_link(&dev->kobj, "subsystem");
747out:
748 return error;
749}
750
751static void device_remove_class_symlinks(struct device *dev)
752{
753 if (!dev->class)
754 return;
Kay Sieversda231fd2007-11-21 17:29:15 +0100755
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700756#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800757 if (dev->parent && device_is_not_partition(dev)) {
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700758 char *class_name;
759
760 class_name = make_class_name(dev->class->name, &dev->kobj);
761 if (class_name) {
762 sysfs_remove_link(&dev->parent->kobj, class_name);
763 kfree(class_name);
764 }
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700765 sysfs_remove_link(&dev->kobj, "device");
766 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100767
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700768 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800769 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700770 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100771 dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100772#else
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800773 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100774 sysfs_remove_link(&dev->kobj, "device");
775
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100776 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100777#endif
778
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700779 sysfs_remove_link(&dev->kobj, "subsystem");
780}
781
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782/**
Stephen Rothwell413c2392008-05-30 10:16:40 +1000783 * dev_set_name - set a device name
784 * @dev: device
Randy Dunlap46232362008-06-04 21:40:43 -0700785 * @fmt: format string for the device's name
Stephen Rothwell413c2392008-05-30 10:16:40 +1000786 */
787int dev_set_name(struct device *dev, const char *fmt, ...)
788{
789 va_list vargs;
790
791 va_start(vargs, fmt);
792 vsnprintf(dev->bus_id, sizeof(dev->bus_id), fmt, vargs);
793 va_end(vargs);
794 return 0;
795}
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
871 /* Temporarily support init_name if it is set.
872 * It will override bus_id for now */
873 if (dev->init_name)
874 dev_set_name(dev, "%s", dev->init_name);
875
876 if (!strlen(dev->bus_id))
877 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100879 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartmanc205ef42006-08-07 22:19:37 -0700880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 parent = get_device(dev->parent);
Cornelia Huck63b69712008-01-21 16:09:44 +0100882 setup_parent(dev, parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Yinghai Lu0d358f22008-02-19 03:20:41 -0800884 /* use parent numa_node */
885 if (parent)
886 set_dev_node(dev, dev_to_node(parent));
887
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 /* first, register with generic layer. */
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100889 error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev_name(dev));
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100890 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 goto Error;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200892
Brian Walsh37022642006-08-14 22:43:19 -0700893 /* notify platform of device entry */
894 if (platform_notify)
895 platform_notify(dev);
896
Tejun Heoad6a1e12007-06-14 03:45:17 +0900897 error = device_create_file(dev, &uevent_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200898 if (error)
899 goto attrError;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200900
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700901 if (MAJOR(dev->devt)) {
Tejun Heoad6a1e12007-06-14 03:45:17 +0900902 error = device_create_file(dev, &devt_attr);
903 if (error)
Cornelia Hucka306eea2006-09-22 11:37:13 +0200904 goto ueventattrError;
Dan Williamse105b8b2008-04-21 10:51:07 -0700905
906 error = device_create_sys_dev_entry(dev);
907 if (error)
908 goto devtattrError;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700909 }
910
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700911 error = device_add_class_symlinks(dev);
912 if (error)
913 goto SymlinkError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700914 error = device_add_attrs(dev);
915 if (error)
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700916 goto AttrsError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700917 error = bus_add_device(dev);
918 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 goto BusError;
Alan Stern3b98aea2008-08-07 13:06:12 -0400920 error = dpm_sysfs_add(dev);
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100921 if (error)
Alan Stern3b98aea2008-08-07 13:06:12 -0400922 goto DPMError;
923 device_pm_add(dev);
Alan Sternec0676ee2008-12-05 14:10:31 -0500924
925 /* Notify clients of device addition. This call must come
926 * after dpm_sysf_add() and before kobject_uevent().
927 */
928 if (dev->bus)
929 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
930 BUS_NOTIFY_ADD_DEVICE, dev);
931
Cornelia Huck83b5fb4c2007-03-29 11:12:11 +0200932 kobject_uevent(&dev->kobj, KOBJ_ADD);
Cornelia Huckc6a46692007-02-05 16:15:26 -0800933 bus_attach_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 if (parent)
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -0800935 klist_add_tail(&dev->p->knode_parent,
936 &parent->p->klist_children);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700938 if (dev->class) {
Dave Youngf75b1c62008-05-28 09:28:39 -0700939 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200940 /* tie the class to the device */
Tejun Heo5a3ceb82008-08-25 19:50:19 +0200941 klist_add_tail(&dev->knode_class,
942 &dev->class->p->class_devices);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200943
944 /* notify any interfaces that the device is here */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -0700945 list_for_each_entry(class_intf,
946 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200947 if (class_intf->add_dev)
948 class_intf->add_dev(dev, class_intf);
Dave Youngf75b1c62008-05-28 09:28:39 -0700949 mutex_unlock(&dev->class->p->class_mutex);
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700950 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700951done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 put_device(dev);
953 return error;
Alan Stern3b98aea2008-08-07 13:06:12 -0400954 DPMError:
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100955 bus_remove_device(dev);
956 BusError:
James Simmons82f0cf92007-02-21 17:44:51 +0000957 device_remove_attrs(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700958 AttrsError:
Cornelia Huck2ee97caf2007-07-18 01:43:47 -0700959 device_remove_class_symlinks(dev);
960 SymlinkError:
Tejun Heoad6a1e12007-06-14 03:45:17 +0900961 if (MAJOR(dev->devt))
Dan Williamse105b8b2008-04-21 10:51:07 -0700962 device_remove_sys_dev_entry(dev);
963 devtattrError:
964 if (MAJOR(dev->devt))
Tejun Heoad6a1e12007-06-14 03:45:17 +0900965 device_remove_file(dev, &devt_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200966 ueventattrError:
Tejun Heoad6a1e12007-06-14 03:45:17 +0900967 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700968 attrError:
Kay Sievers312c0042005-11-16 09:00:00 +0100969 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 kobject_del(&dev->kobj);
971 Error:
Cornelia Huck63b69712008-01-21 16:09:44 +0100972 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 if (parent)
974 put_device(parent);
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700975 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800979 * device_register - register a device with the system.
980 * @dev: pointer to the device structure
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800982 * This happens in two clean steps - initialize the device
983 * and add it to the system. The two steps can be called
984 * separately, but this is the easiest and most common.
985 * I.e. you should only call the two helpers separately if
986 * have a clearly defined need to use and refcount the device
987 * before it is added to the hierarchy.
Cornelia Huck57394112008-09-03 18:26:40 +0200988 *
989 * NOTE: _Never_ directly free @dev after calling this function, even
990 * if it returned an error! Always use put_device() to give up the
991 * reference initialized in this function instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993int device_register(struct device *dev)
994{
995 device_initialize(dev);
996 return device_add(dev);
997}
998
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001000 * get_device - increment reference count for device.
1001 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001003 * This simply forwards the call to kobject_get(), though
1004 * we do take care to provide for the case that we get a NULL
1005 * pointer passed in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001007struct device *get_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008{
1009 return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
1010}
1011
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001013 * put_device - decrement reference count.
1014 * @dev: device in question.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001016void put_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017{
Kay Sieversedfaa7c2007-05-21 22:08:01 +02001018 /* might_sleep(); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 if (dev)
1020 kobject_put(&dev->kobj);
1021}
1022
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001024 * device_del - delete device from system.
1025 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001027 * This is the first part of the device unregistration
1028 * sequence. This removes the device from the lists we control
1029 * from here, has it removed from the other driver model
1030 * subsystems it was added to in device_add(), and removes it
1031 * from the kobject hierarchy.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001033 * NOTE: this should be called manually _iff_ device_add() was
1034 * also called manually.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001036void device_del(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001038 struct device *parent = dev->parent;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001039 struct class_interface *class_intf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040
Alan Sternec0676ee2008-12-05 14:10:31 -05001041 /* Notify clients of device removal. This call must come
1042 * before dpm_sysfs_remove().
1043 */
1044 if (dev->bus)
1045 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
1046 BUS_NOTIFY_DEL_DEVICE, dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001047 device_pm_remove(dev);
Alan Stern3b98aea2008-08-07 13:06:12 -04001048 dpm_sysfs_remove(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 if (parent)
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001050 klist_del(&dev->p->knode_parent);
Dan Williamse105b8b2008-04-21 10:51:07 -07001051 if (MAJOR(dev->devt)) {
1052 device_remove_sys_dev_entry(dev);
Tejun Heoad6a1e12007-06-14 03:45:17 +09001053 device_remove_file(dev, &devt_attr);
Dan Williamse105b8b2008-04-21 10:51:07 -07001054 }
Kay Sieversb9d9c822006-06-15 15:31:56 +02001055 if (dev->class) {
Kay Sieversda231fd2007-11-21 17:29:15 +01001056 device_remove_class_symlinks(dev);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001057
Dave Youngf75b1c62008-05-28 09:28:39 -07001058 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001059 /* notify any interfaces that the device is now gone */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -07001060 list_for_each_entry(class_intf,
1061 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001062 if (class_intf->remove_dev)
1063 class_intf->remove_dev(dev, class_intf);
1064 /* remove the device from the class list */
Tejun Heo5a3ceb82008-08-25 19:50:19 +02001065 klist_del(&dev->knode_class);
Dave Youngf75b1c62008-05-28 09:28:39 -07001066 mutex_unlock(&dev->class->p->class_mutex);
Kay Sieversb9d9c822006-06-15 15:31:56 +02001067 }
Tejun Heoad6a1e12007-06-14 03:45:17 +09001068 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -07001069 device_remove_attrs(dev);
Benjamin Herrenschmidt28953532006-11-08 19:46:14 -08001070 bus_remove_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
Tejun Heo2f8d16a2007-03-09 19:34:19 +09001072 /*
1073 * Some platform devices are driven without driver attached
1074 * and managed resources may have been acquired. Make sure
1075 * all resources are released.
1076 */
1077 devres_release_all(dev);
1078
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 /* Notify the platform of the removal, in case they
1080 * need to do anything...
1081 */
1082 if (platform_notify_remove)
1083 platform_notify_remove(dev);
Kay Sievers312c0042005-11-16 09:00:00 +01001084 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Kay Sieversda231fd2007-11-21 17:29:15 +01001085 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 kobject_del(&dev->kobj);
Kay Sieversda231fd2007-11-21 17:29:15 +01001087 put_device(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088}
1089
1090/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001091 * device_unregister - unregister device from system.
1092 * @dev: device going away.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001094 * We do this in two parts, like we do device_register(). First,
1095 * we remove it from all the subsystems with device_del(), then
1096 * we decrement the reference count via put_device(). If that
1097 * is the final reference count, the device will be cleaned up
1098 * via device_release() above. Otherwise, the structure will
1099 * stick around until the final reference to the device is dropped.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001101void device_unregister(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001103 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 device_del(dev);
1105 put_device(dev);
1106}
1107
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001108static struct device *next_device(struct klist_iter *i)
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001109{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001110 struct klist_node *n = klist_next(i);
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001111 struct device *dev = NULL;
1112 struct device_private *p;
1113
1114 if (n) {
1115 p = to_device_private_parent(n);
1116 dev = p->device;
1117 }
1118 return dev;
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001119}
1120
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001122 * device_for_each_child - device child iterator.
1123 * @parent: parent struct device.
1124 * @data: data for the callback.
1125 * @fn: function to be called for each device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001127 * Iterate over @parent's child devices, and call @fn for each,
1128 * passing it @data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001130 * We check the return of @fn each time. If it returns anything
1131 * other than 0, we break out and return that value.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001133int device_for_each_child(struct device *parent, void *data,
1134 int (*fn)(struct device *dev, void *data))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135{
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001136 struct klist_iter i;
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001137 struct device *child;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 int error = 0;
1139
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001140 klist_iter_init(&parent->p->klist_children, &i);
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001141 while ((child = next_device(&i)) && !error)
1142 error = fn(child, data);
1143 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 return error;
1145}
1146
Cornelia Huck5ab69982006-11-16 15:42:07 +01001147/**
1148 * device_find_child - device iterator for locating a particular device.
1149 * @parent: parent struct device
1150 * @data: Data to pass to match function
1151 * @match: Callback function to check device
1152 *
1153 * This is similar to the device_for_each_child() function above, but it
1154 * returns a reference to a device that is 'found' for later use, as
1155 * determined by the @match callback.
1156 *
1157 * The callback should return 0 if the device doesn't match and non-zero
1158 * if it does. If the callback returns non-zero and a reference to the
1159 * current device can be obtained, this function will return to the caller
1160 * and not iterate over any more devices.
1161 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001162struct device *device_find_child(struct device *parent, void *data,
1163 int (*match)(struct device *dev, void *data))
Cornelia Huck5ab69982006-11-16 15:42:07 +01001164{
1165 struct klist_iter i;
1166 struct device *child;
1167
1168 if (!parent)
1169 return NULL;
1170
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001171 klist_iter_init(&parent->p->klist_children, &i);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001172 while ((child = next_device(&i)))
1173 if (match(child, data) && get_device(child))
1174 break;
1175 klist_iter_exit(&i);
1176 return child;
1177}
1178
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179int __init devices_init(void)
1180{
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -06001181 devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
1182 if (!devices_kset)
1183 return -ENOMEM;
Dan Williamse105b8b2008-04-21 10:51:07 -07001184 dev_kobj = kobject_create_and_add("dev", NULL);
1185 if (!dev_kobj)
1186 goto dev_kobj_err;
1187 sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
1188 if (!sysfs_dev_block_kobj)
1189 goto block_kobj_err;
1190 sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
1191 if (!sysfs_dev_char_kobj)
1192 goto char_kobj_err;
1193
Greg Kroah-Hartman881c6cf2007-11-01 09:29:06 -06001194 return 0;
Dan Williamse105b8b2008-04-21 10:51:07 -07001195
1196 char_kobj_err:
1197 kobject_put(sysfs_dev_block_kobj);
1198 block_kobj_err:
1199 kobject_put(dev_kobj);
1200 dev_kobj_err:
1201 kset_unregister(devices_kset);
1202 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203}
1204
1205EXPORT_SYMBOL_GPL(device_for_each_child);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001206EXPORT_SYMBOL_GPL(device_find_child);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
1208EXPORT_SYMBOL_GPL(device_initialize);
1209EXPORT_SYMBOL_GPL(device_add);
1210EXPORT_SYMBOL_GPL(device_register);
1211
1212EXPORT_SYMBOL_GPL(device_del);
1213EXPORT_SYMBOL_GPL(device_unregister);
1214EXPORT_SYMBOL_GPL(get_device);
1215EXPORT_SYMBOL_GPL(put_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216
1217EXPORT_SYMBOL_GPL(device_create_file);
1218EXPORT_SYMBOL_GPL(device_remove_file);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001219
1220
1221static void device_create_release(struct device *dev)
1222{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001223 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001224 kfree(dev);
1225}
1226
1227/**
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001228 * device_create_vargs - creates a device and registers it with sysfs
1229 * @class: pointer to the struct class that this device should be registered to
1230 * @parent: pointer to the parent struct device of this new device, if any
1231 * @devt: the dev_t for the char device to be added
1232 * @drvdata: the data to be added to the device for callbacks
1233 * @fmt: string for the device's name
1234 * @args: va_list for the device's name
1235 *
1236 * This function can be used by char device classes. A struct device
1237 * will be created in sysfs, registered to the specified class.
1238 *
1239 * A "dev" file will be created, showing the dev_t for the device, if
1240 * the dev_t is not 0,0.
1241 * If a pointer to a parent struct device is passed in, the newly created
1242 * struct device will be a child of that device in sysfs.
1243 * The pointer to the struct device will be returned from the call.
1244 * Any further sysfs files that might be required can be created using this
1245 * pointer.
1246 *
1247 * Note: the struct class passed to this function must have previously
1248 * been created with a call to class_create().
1249 */
1250struct device *device_create_vargs(struct class *class, struct device *parent,
1251 dev_t devt, void *drvdata, const char *fmt,
1252 va_list args)
1253{
1254 struct device *dev = NULL;
1255 int retval = -ENODEV;
1256
1257 if (class == NULL || IS_ERR(class))
1258 goto error;
1259
1260 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1261 if (!dev) {
1262 retval = -ENOMEM;
1263 goto error;
1264 }
1265
1266 dev->devt = devt;
1267 dev->class = class;
1268 dev->parent = parent;
1269 dev->release = device_create_release;
1270 dev_set_drvdata(dev, drvdata);
1271
1272 vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
1273 retval = device_register(dev);
1274 if (retval)
1275 goto error;
1276
1277 return dev;
1278
1279error:
Cornelia Huck286661b2008-09-03 18:26:41 +02001280 put_device(dev);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001281 return ERR_PTR(retval);
1282}
1283EXPORT_SYMBOL_GPL(device_create_vargs);
1284
1285/**
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001286 * device_create - creates a device and registers it with sysfs
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001287 * @class: pointer to the struct class that this device should be registered to
1288 * @parent: pointer to the parent struct device of this new device, if any
1289 * @devt: the dev_t for the char device to be added
1290 * @drvdata: the data to be added to the device for callbacks
1291 * @fmt: string for the device's name
1292 *
1293 * This function can be used by char device classes. A struct device
1294 * will be created in sysfs, registered to the specified class.
1295 *
1296 * A "dev" file will be created, showing the dev_t for the device, if
1297 * the dev_t is not 0,0.
1298 * If a pointer to a parent struct device is passed in, the newly created
1299 * struct device will be a child of that device in sysfs.
1300 * The pointer to the struct device will be returned from the call.
1301 * Any further sysfs files that might be required can be created using this
1302 * pointer.
1303 *
1304 * Note: the struct class passed to this function must have previously
1305 * been created with a call to class_create().
1306 */
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001307struct device *device_create(struct class *class, struct device *parent,
1308 dev_t devt, void *drvdata, const char *fmt, ...)
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001309{
1310 va_list vargs;
1311 struct device *dev;
1312
1313 va_start(vargs, fmt);
1314 dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
1315 va_end(vargs);
1316 return dev;
1317}
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001318EXPORT_SYMBOL_GPL(device_create);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001319
Dave Youngcd354492008-01-28 16:56:11 +08001320static int __match_devt(struct device *dev, void *data)
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001321{
Dave Youngcd354492008-01-28 16:56:11 +08001322 dev_t *devt = data;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001323
Dave Youngcd354492008-01-28 16:56:11 +08001324 return dev->devt == *devt;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001325}
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001326
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001327/**
1328 * device_destroy - removes a device that was created with device_create()
1329 * @class: pointer to the struct class that this device was registered with
1330 * @devt: the dev_t of the device that was previously registered
1331 *
1332 * This call unregisters and cleans up a device that was created with a
1333 * call to device_create().
1334 */
1335void device_destroy(struct class *class, dev_t devt)
1336{
1337 struct device *dev;
1338
Greg Kroah-Hartman695794a2008-05-22 17:21:08 -04001339 dev = class_find_device(class, NULL, &devt, __match_devt);
Dave Youngcd354492008-01-28 16:56:11 +08001340 if (dev) {
1341 put_device(dev);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001342 device_unregister(dev);
Dave Youngcd354492008-01-28 16:56:11 +08001343 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001344}
1345EXPORT_SYMBOL_GPL(device_destroy);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001346
1347/**
1348 * device_rename - renames a device
1349 * @dev: the pointer to the struct device to be renamed
1350 * @new_name: the new name of the device
Eric W. Biederman030c1d22008-05-08 14:41:00 -07001351 *
1352 * It is the responsibility of the caller to provide mutual
1353 * exclusion between two different calls of device_rename
1354 * on the same device to ensure that new_name is valid and
1355 * won't conflict with other devices.
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001356 */
1357int device_rename(struct device *dev, char *new_name)
1358{
1359 char *old_class_name = NULL;
1360 char *new_class_name = NULL;
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001361 char *old_device_name = NULL;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001362 int error;
1363
1364 dev = get_device(dev);
1365 if (!dev)
1366 return -EINVAL;
1367
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001368 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -08001369 __func__, new_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001370
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001371#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001372 if ((dev->class) && (dev->parent))
1373 old_class_name = make_class_name(dev->class->name, &dev->kobj);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001374#endif
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001375
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001376 old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL);
1377 if (!old_device_name) {
1378 error = -ENOMEM;
1379 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001380 }
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001381 strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001382 strlcpy(dev->bus_id, new_name, BUS_ID_SIZE);
1383
1384 error = kobject_rename(&dev->kobj, new_name);
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001385 if (error) {
1386 strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE);
1387 goto out;
1388 }
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001389
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001390#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001391 if (old_class_name) {
1392 new_class_name = make_class_name(dev->class->name, &dev->kobj);
1393 if (new_class_name) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001394 error = sysfs_create_link_nowarn(&dev->parent->kobj,
1395 &dev->kobj,
1396 new_class_name);
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001397 if (error)
1398 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001399 sysfs_remove_link(&dev->parent->kobj, old_class_name);
1400 }
1401 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001402#else
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001403 if (dev->class) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001404 error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001405 &dev->kobj, dev_name(dev));
Stephen Hemminger0599ad52008-05-14 22:34:16 -07001406 if (error)
1407 goto out;
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -07001408 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -05001409 old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001410 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001411#endif
1412
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001413out:
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001414 put_device(dev);
1415
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001416 kfree(new_class_name);
Jesper Juhl952ab432006-09-28 23:56:01 +02001417 kfree(old_class_name);
Cornelia Huck2ee97caf2007-07-18 01:43:47 -07001418 kfree(old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001419
1420 return error;
1421}
Johannes Berga2807db2007-02-28 12:38:31 +01001422EXPORT_SYMBOL_GPL(device_rename);
Cornelia Huck8a824722006-11-20 17:07:51 +01001423
1424static int device_move_class_links(struct device *dev,
1425 struct device *old_parent,
1426 struct device *new_parent)
1427{
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001428 int error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001429#ifdef CONFIG_SYSFS_DEPRECATED
Cornelia Huck8a824722006-11-20 17:07:51 +01001430 char *class_name;
1431
1432 class_name = make_class_name(dev->class->name, &dev->kobj);
1433 if (!class_name) {
Cornelia Huckcb360bb2006-11-27 10:35:05 +01001434 error = -ENOMEM;
Cornelia Huck8a824722006-11-20 17:07:51 +01001435 goto out;
1436 }
1437 if (old_parent) {
1438 sysfs_remove_link(&dev->kobj, "device");
1439 sysfs_remove_link(&old_parent->kobj, class_name);
1440 }
Cornelia Huckc744aea2007-01-08 20:16:44 +01001441 if (new_parent) {
1442 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1443 "device");
1444 if (error)
1445 goto out;
1446 error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
1447 class_name);
1448 if (error)
1449 sysfs_remove_link(&dev->kobj, "device");
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001450 } else
Cornelia Huckc744aea2007-01-08 20:16:44 +01001451 error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001452out:
1453 kfree(class_name);
1454 return error;
1455#else
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001456 if (old_parent)
1457 sysfs_remove_link(&dev->kobj, "device");
1458 if (new_parent)
1459 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1460 "device");
1461 return error;
Cornelia Huck8a824722006-11-20 17:07:51 +01001462#endif
1463}
1464
1465/**
1466 * device_move - moves a device to a new parent
1467 * @dev: the pointer to the struct device to be moved
Cornelia Huckc744aea2007-01-08 20:16:44 +01001468 * @new_parent: the new parent of the device (can by NULL)
Cornelia Huck8a824722006-11-20 17:07:51 +01001469 */
1470int device_move(struct device *dev, struct device *new_parent)
1471{
1472 int error;
1473 struct device *old_parent;
Cornelia Huckc744aea2007-01-08 20:16:44 +01001474 struct kobject *new_parent_kobj;
Cornelia Huck8a824722006-11-20 17:07:51 +01001475
1476 dev = get_device(dev);
1477 if (!dev)
1478 return -EINVAL;
1479
Cornelia Huck8a824722006-11-20 17:07:51 +01001480 new_parent = get_device(new_parent);
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001481 new_parent_kobj = get_device_parent(dev, new_parent);
Cornelia Huck63b69712008-01-21 16:09:44 +01001482
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001483 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
1484 __func__, new_parent ? dev_name(new_parent) : "<NULL>");
Cornelia Huckc744aea2007-01-08 20:16:44 +01001485 error = kobject_move(&dev->kobj, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001486 if (error) {
Cornelia Huck63b69712008-01-21 16:09:44 +01001487 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001488 put_device(new_parent);
1489 goto out;
1490 }
1491 old_parent = dev->parent;
1492 dev->parent = new_parent;
1493 if (old_parent)
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001494 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001495 if (new_parent) {
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001496 klist_add_tail(&dev->p->knode_parent,
1497 &new_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001498 set_dev_node(dev, dev_to_node(new_parent));
1499 }
1500
Cornelia Huck8a824722006-11-20 17:07:51 +01001501 if (!dev->class)
1502 goto out_put;
1503 error = device_move_class_links(dev, old_parent, new_parent);
1504 if (error) {
1505 /* We ignore errors on cleanup since we're hosed anyway... */
1506 device_move_class_links(dev, new_parent, old_parent);
1507 if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
Cornelia Huckc744aea2007-01-08 20:16:44 +01001508 if (new_parent)
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001509 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001510 dev->parent = old_parent;
1511 if (old_parent) {
Greg Kroah-Hartman11c3b5c2008-12-16 12:24:56 -08001512 klist_add_tail(&dev->p->knode_parent,
1513 &old_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001514 set_dev_node(dev, dev_to_node(old_parent));
1515 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001516 }
Cornelia Huck63b69712008-01-21 16:09:44 +01001517 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001518 put_device(new_parent);
1519 goto out;
1520 }
1521out_put:
1522 put_device(old_parent);
1523out:
1524 put_device(dev);
1525 return error;
1526}
Cornelia Huck8a824722006-11-20 17:07:51 +01001527EXPORT_SYMBOL_GPL(device_move);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001528
1529/**
1530 * device_shutdown - call ->shutdown() on each device to shutdown.
1531 */
1532void device_shutdown(void)
1533{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001534 struct device *dev, *devn;
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001535
1536 list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
1537 kobj.entry) {
1538 if (dev->bus && dev->bus->shutdown) {
1539 dev_dbg(dev, "shutdown\n");
1540 dev->bus->shutdown(dev);
1541 } else if (dev->driver && dev->driver->shutdown) {
1542 dev_dbg(dev, "shutdown\n");
1543 dev->driver->shutdown(dev);
1544 }
1545 }
Dan Williamse105b8b2008-04-21 10:51:07 -07001546 kobject_put(sysfs_dev_char_kobj);
1547 kobject_put(sysfs_dev_block_kobj);
1548 kobject_put(dev_kobj);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001549}