blob: 282025770429b08f329373c1a286637c6a210f45 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * drivers/base/core.c - core driver model code (device registration, etc)
3 *
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
Greg Kroah-Hartman64bb5d22006-06-28 16:19:58 -07006 * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de>
7 * Copyright (c) 2006 Novell, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * This file is released under the GPLv2
10 *
11 */
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/device.h>
14#include <linux/err.h>
15#include <linux/init.h>
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/string.h>
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -070019#include <linux/kdev_t.h>
Benjamin Herrenschmidt116af372006-10-25 13:44:59 +100020#include <linux/notifier.h>
Kay Sieversda231fd2007-11-21 17:29:15 +010021#include <linux/genhd.h>
Andrew Morton815d2d52008-03-04 15:09:07 -080022#include <linux/kallsyms.h>
Matthew Wilcox6188e102008-04-18 22:21:05 -040023#include <linux/semaphore.h>
Dave Youngf75b1c62008-05-28 09:28:39 -070024#include <linux/mutex.h>
Shaohua Li401097e2009-05-12 13:37:57 -070025#include <linux/async.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27#include "base.h"
28#include "power/power.h"
29
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080030int (*platform_notify)(struct device *dev) = NULL;
31int (*platform_notify_remove)(struct device *dev) = NULL;
Dan Williamse105b8b2008-04-21 10:51:07 -070032static struct kobject *dev_kobj;
33struct kobject *sysfs_dev_char_kobj;
34struct kobject *sysfs_dev_block_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -080036#ifdef CONFIG_BLOCK
37static inline int device_is_not_partition(struct device *dev)
38{
39 return !(dev->type == &part_type);
40}
41#else
42static inline int device_is_not_partition(struct device *dev)
43{
44 return 1;
45}
46#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Alan Stern3e956372006-06-16 17:10:48 -040048/**
49 * dev_driver_string - Return a device's driver name, if at all possible
50 * @dev: struct device to get the name of
51 *
52 * Will return the device's driver's name if it is bound to a device. If
53 * the device is not bound to a device, it will return the name of the bus
54 * it is attached to. If it is not attached to a bus either, an empty
55 * string will be returned.
56 */
Jean Delvarebf9ca692008-07-30 12:29:21 -070057const char *dev_driver_string(const struct device *dev)
Alan Stern3e956372006-06-16 17:10:48 -040058{
Alan Stern35899722009-12-04 11:06:57 -050059 struct device_driver *drv;
60
61 /* dev->driver can change to NULL underneath us because of unbinding,
62 * so be careful about accessing it. dev->bus and dev->class should
63 * never change once they are set, so they don't need special care.
64 */
65 drv = ACCESS_ONCE(dev->driver);
66 return drv ? drv->name :
Jean Delvarea456b702007-03-09 16:33:10 +010067 (dev->bus ? dev->bus->name :
68 (dev->class ? dev->class->name : ""));
Alan Stern3e956372006-06-16 17:10:48 -040069}
Matthew Wilcox310a9222006-09-23 23:35:04 -060070EXPORT_SYMBOL(dev_driver_string);
Alan Stern3e956372006-06-16 17:10:48 -040071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072#define to_dev(obj) container_of(obj, struct device, kobj)
73#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
74
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080075static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
76 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080078 struct device_attribute *dev_attr = to_dev_attr(attr);
79 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050080 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 if (dev_attr->show)
Yani Ioannou54b6f352005-05-17 06:39:34 -040083 ret = dev_attr->show(dev, dev_attr, buf);
Andrew Morton815d2d52008-03-04 15:09:07 -080084 if (ret >= (ssize_t)PAGE_SIZE) {
85 print_symbol("dev_attr_show: %s returned bad count\n",
86 (unsigned long)dev_attr->show);
87 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return ret;
89}
90
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080091static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
92 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080094 struct device_attribute *dev_attr = to_dev_attr(attr);
95 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050096 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98 if (dev_attr->store)
Yani Ioannou54b6f352005-05-17 06:39:34 -040099 ret = dev_attr->store(dev, dev_attr, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return ret;
101}
102
103static struct sysfs_ops dev_sysfs_ops = {
104 .show = dev_attr_show,
105 .store = dev_attr_store,
106};
107
108
109/**
110 * device_release - free device structure.
111 * @kobj: device's kobject.
112 *
113 * This is called once the reference count for the object
114 * reaches 0. We forward the call to the device's release
115 * method, which should handle actually freeing the structure.
116 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800117static void device_release(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800119 struct device *dev = to_dev(kobj);
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800120 struct device_private *p = dev->p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122 if (dev->release)
123 dev->release(dev);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200124 else if (dev->type && dev->type->release)
125 dev->type->release(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700126 else if (dev->class && dev->class->dev_release)
127 dev->class->dev_release(dev);
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700128 else
129 WARN(1, KERN_ERR "Device '%s' does not have a release() "
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800130 "function, it is broken and must be fixed.\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100131 dev_name(dev));
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800132 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133}
134
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600135static struct kobj_type device_ktype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 .release = device_release,
137 .sysfs_ops = &dev_sysfs_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138};
139
140
Kay Sievers312c0042005-11-16 09:00:00 +0100141static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
143 struct kobj_type *ktype = get_ktype(kobj);
144
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600145 if (ktype == &device_ktype) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 struct device *dev = to_dev(kobj);
147 if (dev->bus)
148 return 1;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700149 if (dev->class)
150 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 }
152 return 0;
153}
154
Kay Sievers312c0042005-11-16 09:00:00 +0100155static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
157 struct device *dev = to_dev(kobj);
158
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700159 if (dev->bus)
160 return dev->bus->name;
161 if (dev->class)
162 return dev->class->name;
163 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
Kay Sievers7eff2e72007-08-14 15:15:12 +0200166static int dev_uevent(struct kset *kset, struct kobject *kobj,
167 struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
169 struct device *dev = to_dev(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 int retval = 0;
171
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200172 /* add device node properties if present */
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700173 if (MAJOR(dev->devt)) {
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200174 const char *tmp;
175 const char *name;
Kay Sieverse454cea2009-09-18 23:01:12 +0200176 mode_t mode = 0;
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200177
Kay Sievers7eff2e72007-08-14 15:15:12 +0200178 add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
179 add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
Kay Sieverse454cea2009-09-18 23:01:12 +0200180 name = device_get_devnode(dev, &mode, &tmp);
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200181 if (name) {
182 add_uevent_var(env, "DEVNAME=%s", name);
183 kfree(tmp);
Kay Sieverse454cea2009-09-18 23:01:12 +0200184 if (mode)
185 add_uevent_var(env, "DEVMODE=%#o", mode & 0777);
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200186 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700187 }
188
Kay Sievers414264f2007-03-12 21:08:57 +0100189 if (dev->type && dev->type->name)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200190 add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
Kay Sievers414264f2007-03-12 21:08:57 +0100191
Kay Sievers239378f2006-10-07 21:54:55 +0200192 if (dev->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200193 add_uevent_var(env, "DRIVER=%s", dev->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200194
Kay Sieversa87cb2a2006-09-14 11:23:28 +0200195#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sievers239378f2006-10-07 21:54:55 +0200196 if (dev->class) {
197 struct device *parent = dev->parent;
198
199 /* find first bus device in parent chain */
200 while (parent && !parent->bus)
201 parent = parent->parent;
202 if (parent && parent->bus) {
203 const char *path;
204
205 path = kobject_get_path(&parent->kobj, GFP_KERNEL);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200206 if (path) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200207 add_uevent_var(env, "PHYSDEVPATH=%s", path);
Kay Sievers2c7afd12007-05-01 13:46:26 +0200208 kfree(path);
209 }
Kay Sievers239378f2006-10-07 21:54:55 +0200210
Kay Sievers7eff2e72007-08-14 15:15:12 +0200211 add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200212
213 if (parent->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200214 add_uevent_var(env, "PHYSDEVDRIVER=%s",
215 parent->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200216 }
217 } else if (dev->bus) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200218 add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200219
220 if (dev->driver)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800221 add_uevent_var(env, "PHYSDEVDRIVER=%s",
222 dev->driver->name);
Kay Sieversd81d9d62006-08-13 06:17:09 +0200223 }
Kay Sievers239378f2006-10-07 21:54:55 +0200224#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Kay Sievers7eff2e72007-08-14 15:15:12 +0200226 /* have the bus specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100227 if (dev->bus && dev->bus->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200228 retval = dev->bus->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: bus uevent() returned %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100231 dev_name(dev), __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
233
Kay Sievers7eff2e72007-08-14 15:15:12 +0200234 /* have the class specific function add its stuff */
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700235 if (dev->class && dev->class->dev_uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200236 retval = dev->class->dev_uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200237 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800238 pr_debug("device: '%s': %s: class uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100239 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800240 __func__, retval);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200241 }
242
Kay Sievers7eff2e72007-08-14 15:15:12 +0200243 /* have the device type specific fuction add its stuff */
Kay Sieversf9f852d2006-10-07 21:54:55 +0200244 if (dev->type && dev->type->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200245 retval = dev->type->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200246 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800247 pr_debug("device: '%s': %s: dev_type uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100248 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800249 __func__, retval);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700250 }
251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 return retval;
253}
254
Kay Sievers312c0042005-11-16 09:00:00 +0100255static struct kset_uevent_ops device_uevent_ops = {
256 .filter = dev_uevent_filter,
257 .name = dev_uevent_name,
258 .uevent = dev_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259};
260
Kay Sievers16574dc2007-04-06 01:40:38 +0200261static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
262 char *buf)
263{
264 struct kobject *top_kobj;
265 struct kset *kset;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200266 struct kobj_uevent_env *env = NULL;
Kay Sievers16574dc2007-04-06 01:40:38 +0200267 int i;
268 size_t count = 0;
269 int retval;
270
271 /* search the kset, the device belongs to */
272 top_kobj = &dev->kobj;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200273 while (!top_kobj->kset && top_kobj->parent)
274 top_kobj = top_kobj->parent;
Kay Sievers16574dc2007-04-06 01:40:38 +0200275 if (!top_kobj->kset)
276 goto out;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200277
Kay Sievers16574dc2007-04-06 01:40:38 +0200278 kset = top_kobj->kset;
279 if (!kset->uevent_ops || !kset->uevent_ops->uevent)
280 goto out;
281
282 /* respect filter */
283 if (kset->uevent_ops && kset->uevent_ops->filter)
284 if (!kset->uevent_ops->filter(kset, &dev->kobj))
285 goto out;
286
Kay Sievers7eff2e72007-08-14 15:15:12 +0200287 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
288 if (!env)
Greg Kroah-Hartmanc7308c82007-05-02 14:14:11 +0200289 return -ENOMEM;
290
Kay Sievers16574dc2007-04-06 01:40:38 +0200291 /* let the kset specific function add its keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200292 retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200293 if (retval)
294 goto out;
295
296 /* copy keys to file */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200297 for (i = 0; i < env->envp_idx; i++)
298 count += sprintf(&buf[count], "%s\n", env->envp[i]);
Kay Sievers16574dc2007-04-06 01:40:38 +0200299out:
Kay Sievers7eff2e72007-08-14 15:15:12 +0200300 kfree(env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200301 return count;
302}
303
Kay Sieversa7fd6702005-10-01 14:49:43 +0200304static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t count)
306{
Kay Sievers60a96a52007-07-08 22:29:26 +0200307 enum kobject_action action;
308
Kay Sievers5c5daf62007-08-12 20:43:55 +0200309 if (kobject_action_type(buf, count, &action) == 0) {
Kay Sievers60a96a52007-07-08 22:29:26 +0200310 kobject_uevent(&dev->kobj, action);
311 goto out;
312 }
313
314 dev_err(dev, "uevent: unsupported action-string; this will "
315 "be ignored in a future kernel version\n");
Kay Sievers312c0042005-11-16 09:00:00 +0100316 kobject_uevent(&dev->kobj, KOBJ_ADD);
Kay Sievers60a96a52007-07-08 22:29:26 +0200317out:
Kay Sieversa7fd6702005-10-01 14:49:43 +0200318 return count;
319}
320
Tejun Heoad6a1e12007-06-14 03:45:17 +0900321static struct device_attribute uevent_attr =
322 __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
323
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500324static int device_add_attributes(struct device *dev,
325 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700326{
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700327 int error = 0;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500328 int i;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700329
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500330 if (attrs) {
331 for (i = 0; attr_name(attrs[i]); i++) {
332 error = device_create_file(dev, &attrs[i]);
333 if (error)
334 break;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700335 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500336 if (error)
337 while (--i >= 0)
338 device_remove_file(dev, &attrs[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700339 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700340 return error;
341}
342
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500343static void device_remove_attributes(struct device *dev,
344 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700345{
346 int i;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500347
348 if (attrs)
349 for (i = 0; attr_name(attrs[i]); i++)
350 device_remove_file(dev, &attrs[i]);
351}
352
353static int device_add_groups(struct device *dev,
David Brownella4dbd672009-06-24 10:06:31 -0700354 const struct attribute_group **groups)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500355{
356 int error = 0;
357 int i;
358
359 if (groups) {
360 for (i = 0; groups[i]; i++) {
361 error = sysfs_create_group(&dev->kobj, groups[i]);
362 if (error) {
363 while (--i >= 0)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800364 sysfs_remove_group(&dev->kobj,
365 groups[i]);
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500366 break;
367 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700368 }
369 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500370 return error;
371}
372
373static void device_remove_groups(struct device *dev,
David Brownella4dbd672009-06-24 10:06:31 -0700374 const struct attribute_group **groups)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500375{
376 int i;
377
378 if (groups)
379 for (i = 0; groups[i]; i++)
380 sysfs_remove_group(&dev->kobj, groups[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700381}
382
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700383static int device_add_attrs(struct device *dev)
384{
385 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200386 struct device_type *type = dev->type;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500387 int error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700388
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500389 if (class) {
390 error = device_add_attributes(dev, class->dev_attrs);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200391 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500392 return error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700393 }
Kay Sieversf9f852d2006-10-07 21:54:55 +0200394
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500395 if (type) {
396 error = device_add_groups(dev, type->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200397 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500398 goto err_remove_class_attrs;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200399 }
400
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500401 error = device_add_groups(dev, dev->groups);
402 if (error)
403 goto err_remove_type_groups;
404
405 return 0;
406
407 err_remove_type_groups:
408 if (type)
409 device_remove_groups(dev, type->groups);
410 err_remove_class_attrs:
411 if (class)
412 device_remove_attributes(dev, class->dev_attrs);
413
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700414 return error;
415}
416
417static void device_remove_attrs(struct device *dev)
418{
419 struct class *class = dev->class;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200420 struct device_type *type = dev->type;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700421
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500422 device_remove_groups(dev, dev->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200423
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500424 if (type)
425 device_remove_groups(dev, type->groups);
426
427 if (class)
428 device_remove_attributes(dev, class->dev_attrs);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700429}
430
431
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700432static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
433 char *buf)
434{
435 return print_dev_t(buf, dev->devt);
436}
437
Tejun Heoad6a1e12007-06-14 03:45:17 +0900438static struct device_attribute devt_attr =
439 __ATTR(dev, S_IRUGO, show_dev, NULL);
440
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600441/* kset to create /sys/devices/ */
442struct kset *devices_kset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800445 * device_create_file - create sysfs attribute file for device.
446 * @dev: device.
447 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 */
Phil Carmody26579ab2009-12-18 15:34:19 +0200449int device_create_file(struct device *dev,
450 const struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451{
452 int error = 0;
Cornelia Huck0c98b192008-01-31 10:39:38 +0100453 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 error = sysfs_create_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 return error;
456}
457
458/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800459 * device_remove_file - remove sysfs attribute file.
460 * @dev: device.
461 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 */
Phil Carmody26579ab2009-12-18 15:34:19 +0200463void device_remove_file(struct device *dev,
464 const struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
Cornelia Huck0c98b192008-01-31 10:39:38 +0100466 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 sysfs_remove_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468}
469
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700470/**
471 * device_create_bin_file - create sysfs binary attribute file for device.
472 * @dev: device.
473 * @attr: device binary attribute descriptor.
474 */
Phil Carmody66ecb922009-12-18 15:34:20 +0200475int device_create_bin_file(struct device *dev,
476 const struct bin_attribute *attr)
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700477{
478 int error = -EINVAL;
479 if (dev)
480 error = sysfs_create_bin_file(&dev->kobj, attr);
481 return error;
482}
483EXPORT_SYMBOL_GPL(device_create_bin_file);
484
485/**
486 * device_remove_bin_file - remove sysfs binary attribute file
487 * @dev: device.
488 * @attr: device binary attribute descriptor.
489 */
Phil Carmody66ecb922009-12-18 15:34:20 +0200490void device_remove_bin_file(struct device *dev,
491 const struct bin_attribute *attr)
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700492{
493 if (dev)
494 sysfs_remove_bin_file(&dev->kobj, attr);
495}
496EXPORT_SYMBOL_GPL(device_remove_bin_file);
497
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400498/**
Alan Stern523ded72007-04-26 00:12:04 -0700499 * device_schedule_callback_owner - helper to schedule a callback for a device
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400500 * @dev: device.
501 * @func: callback function to invoke later.
Alan Stern523ded72007-04-26 00:12:04 -0700502 * @owner: module owning the callback routine
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400503 *
504 * Attribute methods must not unregister themselves or their parent device
505 * (which would amount to the same thing). Attempts to do so will deadlock,
506 * since unregistration is mutually exclusive with driver callbacks.
507 *
508 * Instead methods can call this routine, which will attempt to allocate
509 * and schedule a workqueue request to call back @func with @dev as its
510 * argument in the workqueue's process context. @dev will be pinned until
511 * @func returns.
512 *
Alan Stern523ded72007-04-26 00:12:04 -0700513 * This routine is usually called via the inline device_schedule_callback(),
514 * which automatically sets @owner to THIS_MODULE.
515 *
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400516 * Returns 0 if the request was submitted, -ENOMEM if storage could not
Alan Stern523ded72007-04-26 00:12:04 -0700517 * be allocated, -ENODEV if a reference to @owner isn't available.
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400518 *
519 * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
520 * underlying sysfs routine (since it is intended for use by attribute
521 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
522 */
Alan Stern523ded72007-04-26 00:12:04 -0700523int device_schedule_callback_owner(struct device *dev,
524 void (*func)(struct device *), struct module *owner)
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400525{
526 return sysfs_schedule_callback(&dev->kobj,
Alan Stern523ded72007-04-26 00:12:04 -0700527 (void (*)(void *)) func, dev, owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400528}
Alan Stern523ded72007-04-26 00:12:04 -0700529EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400530
James Bottomley34bb61f2005-09-06 16:56:51 -0700531static void klist_children_get(struct klist_node *n)
532{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800533 struct device_private *p = to_device_private_parent(n);
534 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700535
536 get_device(dev);
537}
538
539static void klist_children_put(struct klist_node *n)
540{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800541 struct device_private *p = to_device_private_parent(n);
542 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700543
544 put_device(dev);
545}
546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800548 * device_initialize - init device structure.
549 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 *
Cornelia Huck57394112008-09-03 18:26:40 +0200551 * This prepares the device for use by other layers by initializing
552 * its fields.
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800553 * It is the first half of device_register(), if called by
Cornelia Huck57394112008-09-03 18:26:40 +0200554 * that function, though it can also be called separately, so one
555 * may use @dev's fields. In particular, get_device()/put_device()
556 * may be used for reference counting of @dev after calling this
557 * function.
558 *
559 * NOTE: Use put_device() to give up your reference instead of freeing
560 * @dev directly once you have called this function.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562void device_initialize(struct device *dev)
563{
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600564 dev->kobj.kset = devices_kset;
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700565 kobject_init(&dev->kobj, &device_ktype);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 INIT_LIST_HEAD(&dev->dma_pools);
mochel@digitalimplant.orgaf703162005-03-21 10:41:04 -0800567 init_MUTEX(&dev->sem);
Tejun Heo9ac78492007-01-20 16:00:26 +0900568 spin_lock_init(&dev->devres_lock);
569 INIT_LIST_HEAD(&dev->devres_head);
David Brownell0ac85242005-09-12 19:39:34 -0700570 device_init_wakeup(dev, 0);
Alan Stern3b98aea2008-08-07 13:06:12 -0400571 device_pm_init(dev);
Christoph Hellwig87348132006-12-06 20:32:33 -0800572 set_dev_node(dev, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100575#ifdef CONFIG_SYSFS_DEPRECATED
Kay Sieversda231fd2007-11-21 17:29:15 +0100576static struct kobject *get_device_parent(struct device *dev,
577 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100578{
Kay Sieversda231fd2007-11-21 17:29:15 +0100579 /* class devices without a parent live in /sys/class/<classname>/ */
Dmitry Torokhov3eb215d2007-10-07 12:22:21 -0400580 if (dev->class && (!parent || parent->class != dev->class))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700581 return &dev->class->p->class_subsys.kobj;
Kay Sieversda231fd2007-11-21 17:29:15 +0100582 /* all other devices keep their parent */
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100583 else if (parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100584 return &parent->kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100585
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100586 return NULL;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100587}
Kay Sieversda231fd2007-11-21 17:29:15 +0100588
589static inline void cleanup_device_parent(struct device *dev) {}
Cornelia Huck63b69712008-01-21 16:09:44 +0100590static inline void cleanup_glue_dir(struct device *dev,
591 struct kobject *glue_dir) {}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100592#else
Kay Sievers86406242007-03-14 03:25:56 +0100593static struct kobject *virtual_device_parent(struct device *dev)
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700594{
Kay Sievers86406242007-03-14 03:25:56 +0100595 static struct kobject *virtual_dir = NULL;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700596
Kay Sievers86406242007-03-14 03:25:56 +0100597 if (!virtual_dir)
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -0800598 virtual_dir = kobject_create_and_add("virtual",
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600599 &devices_kset->kobj);
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700600
Kay Sievers86406242007-03-14 03:25:56 +0100601 return virtual_dir;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700602}
603
Kay Sieversda231fd2007-11-21 17:29:15 +0100604static struct kobject *get_device_parent(struct device *dev,
605 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100606{
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800607 int retval;
608
Kay Sievers86406242007-03-14 03:25:56 +0100609 if (dev->class) {
610 struct kobject *kobj = NULL;
611 struct kobject *parent_kobj;
612 struct kobject *k;
613
614 /*
615 * If we have no parent, we live in "virtual".
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100616 * Class-devices with a non class-device as parent, live
617 * in a "glue" directory to prevent namespace collisions.
Kay Sievers86406242007-03-14 03:25:56 +0100618 */
619 if (parent == NULL)
620 parent_kobj = virtual_device_parent(dev);
621 else if (parent->class)
622 return &parent->kobj;
623 else
624 parent_kobj = &parent->kobj;
625
626 /* find our class-directory at the parent and reference it */
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500627 spin_lock(&dev->class->p->class_dirs.list_lock);
628 list_for_each_entry(k, &dev->class->p->class_dirs.list, entry)
Kay Sievers86406242007-03-14 03:25:56 +0100629 if (k->parent == parent_kobj) {
630 kobj = kobject_get(k);
631 break;
632 }
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500633 spin_unlock(&dev->class->p->class_dirs.list_lock);
Kay Sievers86406242007-03-14 03:25:56 +0100634 if (kobj)
635 return kobj;
636
637 /* or create a new class-directory at the parent device */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800638 k = kobject_create();
639 if (!k)
640 return NULL;
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500641 k->kset = &dev->class->p->class_dirs;
Greg Kroah-Hartmanb2d6db52007-12-17 23:05:35 -0700642 retval = kobject_add(k, parent_kobj, "%s", dev->class->name);
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800643 if (retval < 0) {
644 kobject_put(k);
645 return NULL;
646 }
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100647 /* do not emit an uevent for this simple "glue" directory */
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800648 return k;
Kay Sievers86406242007-03-14 03:25:56 +0100649 }
650
651 if (parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100652 return &parent->kobj;
653 return NULL;
654}
Kay Sieversda231fd2007-11-21 17:29:15 +0100655
Cornelia Huck63b69712008-01-21 16:09:44 +0100656static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
Kay Sieversda231fd2007-11-21 17:29:15 +0100657{
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100658 /* see if we live in a "glue" directory */
Cornelia Huckc1fe5392008-02-27 15:38:23 +0100659 if (!glue_dir || !dev->class ||
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -0500660 glue_dir->kset != &dev->class->p->class_dirs)
Kay Sieversda231fd2007-11-21 17:29:15 +0100661 return;
662
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100663 kobject_put(glue_dir);
Kay Sieversda231fd2007-11-21 17:29:15 +0100664}
Cornelia Huck63b69712008-01-21 16:09:44 +0100665
666static void cleanup_device_parent(struct device *dev)
667{
668 cleanup_glue_dir(dev, dev->kobj.parent);
669}
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100670#endif
Kay Sievers86406242007-03-14 03:25:56 +0100671
Cornelia Huck63b69712008-01-21 16:09:44 +0100672static void setup_parent(struct device *dev, struct device *parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100673{
674 struct kobject *kobj;
675 kobj = get_device_parent(dev, parent);
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100676 if (kobj)
677 dev->kobj.parent = kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100678}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100679
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700680static int device_add_class_symlinks(struct device *dev)
681{
682 int error;
683
684 if (!dev->class)
685 return 0;
Kay Sieversda231fd2007-11-21 17:29:15 +0100686
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700687 error = sysfs_create_link(&dev->kobj,
688 &dev->class->p->class_subsys.kobj,
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700689 "subsystem");
690 if (error)
691 goto out;
Kay Sieversda231fd2007-11-21 17:29:15 +0100692
693#ifdef CONFIG_SYSFS_DEPRECATED
694 /* stacked class devices need a symlink in the class directory */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700695 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800696 device_is_not_partition(dev)) {
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700697 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100698 &dev->kobj, dev_name(dev));
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700699 if (error)
700 goto out_subsys;
701 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100702
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800703 if (dev->parent && device_is_not_partition(dev)) {
Kay Sieversda231fd2007-11-21 17:29:15 +0100704 struct device *parent = dev->parent;
705 char *class_name;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700706
Kay Sieversda231fd2007-11-21 17:29:15 +0100707 /*
708 * stacked class devices have the 'device' link
709 * pointing to the bus device instead of the parent
710 */
711 while (parent->class && !parent->bus && parent->parent)
712 parent = parent->parent;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700713
Kay Sieversda231fd2007-11-21 17:29:15 +0100714 error = sysfs_create_link(&dev->kobj,
715 &parent->kobj,
716 "device");
717 if (error)
718 goto out_busid;
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700719
Kay Sieversda231fd2007-11-21 17:29:15 +0100720 class_name = make_class_name(dev->class->name,
721 &dev->kobj);
722 if (class_name)
723 error = sysfs_create_link(&dev->parent->kobj,
724 &dev->kobj, class_name);
725 kfree(class_name);
726 if (error)
727 goto out_device;
728 }
729 return 0;
730
731out_device:
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800732 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100733 sysfs_remove_link(&dev->kobj, "device");
734out_busid:
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700735 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800736 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700737 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100738 dev_name(dev));
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700739#else
Kay Sieversda231fd2007-11-21 17:29:15 +0100740 /* link in the class directory pointing to the device */
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700741 error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100742 &dev->kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100743 if (error)
744 goto out_subsys;
745
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800746 if (dev->parent && device_is_not_partition(dev)) {
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700747 error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
748 "device");
749 if (error)
750 goto out_busid;
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700751 }
752 return 0;
753
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700754out_busid:
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100755 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100756#endif
757
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700758out_subsys:
759 sysfs_remove_link(&dev->kobj, "subsystem");
760out:
761 return error;
762}
763
764static void device_remove_class_symlinks(struct device *dev)
765{
766 if (!dev->class)
767 return;
Kay Sieversda231fd2007-11-21 17:29:15 +0100768
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700769#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800770 if (dev->parent && device_is_not_partition(dev)) {
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700771 char *class_name;
772
773 class_name = make_class_name(dev->class->name, &dev->kobj);
774 if (class_name) {
775 sysfs_remove_link(&dev->parent->kobj, class_name);
776 kfree(class_name);
777 }
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700778 sysfs_remove_link(&dev->kobj, "device");
779 }
Kay Sieversda231fd2007-11-21 17:29:15 +0100780
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700781 if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800782 device_is_not_partition(dev))
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700783 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100784 dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100785#else
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800786 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100787 sysfs_remove_link(&dev->kobj, "device");
788
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100789 sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev));
Kay Sieversda231fd2007-11-21 17:29:15 +0100790#endif
791
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700792 sysfs_remove_link(&dev->kobj, "subsystem");
793}
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795/**
Stephen Rothwell413c2392008-05-30 10:16:40 +1000796 * dev_set_name - set a device name
797 * @dev: device
Randy Dunlap46232362008-06-04 21:40:43 -0700798 * @fmt: format string for the device's name
Stephen Rothwell413c2392008-05-30 10:16:40 +1000799 */
800int dev_set_name(struct device *dev, const char *fmt, ...)
801{
802 va_list vargs;
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100803 int err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000804
805 va_start(vargs, fmt);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100806 err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
Stephen Rothwell413c2392008-05-30 10:16:40 +1000807 va_end(vargs);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100808 return err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000809}
810EXPORT_SYMBOL_GPL(dev_set_name);
811
812/**
Dan Williamse105b8b2008-04-21 10:51:07 -0700813 * device_to_dev_kobj - select a /sys/dev/ directory for the device
814 * @dev: device
815 *
816 * By default we select char/ for new entries. Setting class->dev_obj
817 * to NULL prevents an entry from being created. class->dev_kobj must
818 * be set (or cleared) before any devices are registered to the class
819 * otherwise device_create_sys_dev_entry() and
820 * device_remove_sys_dev_entry() will disagree about the the presence
821 * of the link.
822 */
823static struct kobject *device_to_dev_kobj(struct device *dev)
824{
825 struct kobject *kobj;
826
827 if (dev->class)
828 kobj = dev->class->dev_kobj;
829 else
830 kobj = sysfs_dev_char_kobj;
831
832 return kobj;
833}
834
835static int device_create_sys_dev_entry(struct device *dev)
836{
837 struct kobject *kobj = device_to_dev_kobj(dev);
838 int error = 0;
839 char devt_str[15];
840
841 if (kobj) {
842 format_dev_t(devt_str, dev->devt);
843 error = sysfs_create_link(kobj, &dev->kobj, devt_str);
844 }
845
846 return error;
847}
848
849static void device_remove_sys_dev_entry(struct device *dev)
850{
851 struct kobject *kobj = device_to_dev_kobj(dev);
852 char devt_str[15];
853
854 if (kobj) {
855 format_dev_t(devt_str, dev->devt);
856 sysfs_remove_link(kobj, devt_str);
857 }
858}
859
Greg Kroah-Hartmanb4028432009-05-11 14:16:57 -0700860int device_private_init(struct device *dev)
861{
862 dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
863 if (!dev->p)
864 return -ENOMEM;
865 dev->p->device = dev;
866 klist_init(&dev->p->klist_children, klist_children_get,
867 klist_children_put);
868 return 0;
869}
870
Dan Williamse105b8b2008-04-21 10:51:07 -0700871/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800872 * device_add - add device to device hierarchy.
873 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800875 * This is part 2 of device_register(), though may be called
876 * separately _iff_ device_initialize() has been called separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 *
Cornelia Huck57394112008-09-03 18:26:40 +0200878 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800879 * to the global and sibling lists for the device, then
880 * adds it to the other relevant subsystems of the driver model.
Cornelia Huck57394112008-09-03 18:26:40 +0200881 *
882 * NOTE: _Never_ directly free @dev after calling this function, even
883 * if it returned an error! Always use put_device() to give up your
884 * reference instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 */
886int device_add(struct device *dev)
887{
888 struct device *parent = NULL;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200889 struct class_interface *class_intf;
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700890 int error = -EINVAL;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 dev = get_device(dev);
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700893 if (!dev)
894 goto done;
895
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800896 if (!dev->p) {
Greg Kroah-Hartmanb4028432009-05-11 14:16:57 -0700897 error = device_private_init(dev);
898 if (error)
899 goto done;
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800900 }
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800901
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100902 /*
903 * for statically allocated devices, which should all be converted
904 * some day, we need to initialize the name. We prevent reading back
905 * the name, and force the use of dev_name()
906 */
907 if (dev->init_name) {
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700908 dev_set_name(dev, "%s", dev->init_name);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100909 dev->init_name = NULL;
910 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700911
Thomas Gleixnere6309e72009-12-10 19:32:49 +0000912 if (!dev_name(dev)) {
913 error = -EINVAL;
Kay Sievers5c8563d2009-05-28 14:24:07 -0700914 goto name_error;
Thomas Gleixnere6309e72009-12-10 19:32:49 +0000915 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100917 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartmanc205ef42006-08-07 22:19:37 -0700918
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 parent = get_device(dev->parent);
Cornelia Huck63b69712008-01-21 16:09:44 +0100920 setup_parent(dev, parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Yinghai Lu0d358f22008-02-19 03:20:41 -0800922 /* use parent numa_node */
923 if (parent)
924 set_dev_node(dev, dev_to_node(parent));
925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 /* first, register with generic layer. */
Kay Sievers8a577ff2009-04-18 15:05:45 -0700927 /* we require the name to be set before, and pass NULL */
928 error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100929 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 goto Error;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200931
Brian Walsh37022642006-08-14 22:43:19 -0700932 /* notify platform of device entry */
933 if (platform_notify)
934 platform_notify(dev);
935
Tejun Heoad6a1e12007-06-14 03:45:17 +0900936 error = device_create_file(dev, &uevent_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200937 if (error)
938 goto attrError;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200939
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700940 if (MAJOR(dev->devt)) {
Tejun Heoad6a1e12007-06-14 03:45:17 +0900941 error = device_create_file(dev, &devt_attr);
942 if (error)
Cornelia Hucka306eea2006-09-22 11:37:13 +0200943 goto ueventattrError;
Dan Williamse105b8b2008-04-21 10:51:07 -0700944
945 error = device_create_sys_dev_entry(dev);
946 if (error)
947 goto devtattrError;
Kay Sievers2b2af542009-04-30 15:23:42 +0200948
949 devtmpfs_create_node(dev);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700950 }
951
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700952 error = device_add_class_symlinks(dev);
953 if (error)
954 goto SymlinkError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700955 error = device_add_attrs(dev);
956 if (error)
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700957 goto AttrsError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700958 error = bus_add_device(dev);
959 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 goto BusError;
Alan Stern3b98aea2008-08-07 13:06:12 -0400961 error = dpm_sysfs_add(dev);
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100962 if (error)
Alan Stern3b98aea2008-08-07 13:06:12 -0400963 goto DPMError;
964 device_pm_add(dev);
Alan Sternec0676ee2008-12-05 14:10:31 -0500965
966 /* Notify clients of device addition. This call must come
967 * after dpm_sysf_add() and before kobject_uevent().
968 */
969 if (dev->bus)
970 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
971 BUS_NOTIFY_ADD_DEVICE, dev);
972
Cornelia Huck83b5fb4c2007-03-29 11:12:11 +0200973 kobject_uevent(&dev->kobj, KOBJ_ADD);
Alan Stern2023c612009-07-30 15:27:18 -0400974 bus_probe_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800976 klist_add_tail(&dev->p->knode_parent,
977 &parent->p->klist_children);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700979 if (dev->class) {
Dave Youngf75b1c62008-05-28 09:28:39 -0700980 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200981 /* tie the class to the device */
Tejun Heo5a3ceb82008-08-25 19:50:19 +0200982 klist_add_tail(&dev->knode_class,
983 &dev->class->p->class_devices);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200984
985 /* notify any interfaces that the device is here */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -0700986 list_for_each_entry(class_intf,
987 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200988 if (class_intf->add_dev)
989 class_intf->add_dev(dev, class_intf);
Dave Youngf75b1c62008-05-28 09:28:39 -0700990 mutex_unlock(&dev->class->p->class_mutex);
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700991 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700992done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 put_device(dev);
994 return error;
Alan Stern3b98aea2008-08-07 13:06:12 -0400995 DPMError:
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100996 bus_remove_device(dev);
997 BusError:
James Simmons82f0cf92007-02-21 17:44:51 +0000998 device_remove_attrs(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700999 AttrsError:
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001000 device_remove_class_symlinks(dev);
1001 SymlinkError:
Tejun Heoad6a1e12007-06-14 03:45:17 +09001002 if (MAJOR(dev->devt))
Kay Sieversad729562009-10-28 19:51:37 +01001003 devtmpfs_delete_node(dev);
1004 if (MAJOR(dev->devt))
Dan Williamse105b8b2008-04-21 10:51:07 -07001005 device_remove_sys_dev_entry(dev);
1006 devtattrError:
1007 if (MAJOR(dev->devt))
Tejun Heoad6a1e12007-06-14 03:45:17 +09001008 device_remove_file(dev, &devt_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +02001009 ueventattrError:
Tejun Heoad6a1e12007-06-14 03:45:17 +09001010 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001011 attrError:
Kay Sievers312c0042005-11-16 09:00:00 +01001012 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 kobject_del(&dev->kobj);
1014 Error:
Cornelia Huck63b69712008-01-21 16:09:44 +01001015 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 if (parent)
1017 put_device(parent);
Kay Sievers5c8563d2009-05-28 14:24:07 -07001018name_error:
1019 kfree(dev->p);
1020 dev->p = NULL;
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -07001021 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022}
1023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001025 * device_register - register a device with the system.
1026 * @dev: pointer to the device structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001028 * This happens in two clean steps - initialize the device
1029 * and add it to the system. The two steps can be called
1030 * separately, but this is the easiest and most common.
1031 * I.e. you should only call the two helpers separately if
1032 * have a clearly defined need to use and refcount the device
1033 * before it is added to the hierarchy.
Cornelia Huck57394112008-09-03 18:26:40 +02001034 *
1035 * NOTE: _Never_ directly free @dev after calling this function, even
1036 * if it returned an error! Always use put_device() to give up the
1037 * reference initialized in this function instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039int device_register(struct device *dev)
1040{
1041 device_initialize(dev);
1042 return device_add(dev);
1043}
1044
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001046 * get_device - increment reference count for device.
1047 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001049 * This simply forwards the call to kobject_get(), though
1050 * we do take care to provide for the case that we get a NULL
1051 * pointer passed in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001053struct device *get_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054{
1055 return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
1056}
1057
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001059 * put_device - decrement reference count.
1060 * @dev: device in question.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001062void put_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063{
Kay Sieversedfaa7c2007-05-21 22:08:01 +02001064 /* might_sleep(); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 if (dev)
1066 kobject_put(&dev->kobj);
1067}
1068
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001070 * device_del - delete device from system.
1071 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001073 * This is the first part of the device unregistration
1074 * sequence. This removes the device from the lists we control
1075 * from here, has it removed from the other driver model
1076 * subsystems it was added to in device_add(), and removes it
1077 * from the kobject hierarchy.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001079 * NOTE: this should be called manually _iff_ device_add() was
1080 * also called manually.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001082void device_del(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001084 struct device *parent = dev->parent;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001085 struct class_interface *class_intf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
Alan Sternec0676ee2008-12-05 14:10:31 -05001087 /* Notify clients of device removal. This call must come
1088 * before dpm_sysfs_remove().
1089 */
1090 if (dev->bus)
1091 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
1092 BUS_NOTIFY_DEL_DEVICE, dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001093 device_pm_remove(dev);
Alan Stern3b98aea2008-08-07 13:06:12 -04001094 dpm_sysfs_remove(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001096 klist_del(&dev->p->knode_parent);
Dan Williamse105b8b2008-04-21 10:51:07 -07001097 if (MAJOR(dev->devt)) {
Kay Sievers2b2af542009-04-30 15:23:42 +02001098 devtmpfs_delete_node(dev);
Dan Williamse105b8b2008-04-21 10:51:07 -07001099 device_remove_sys_dev_entry(dev);
Tejun Heoad6a1e12007-06-14 03:45:17 +09001100 device_remove_file(dev, &devt_attr);
Dan Williamse105b8b2008-04-21 10:51:07 -07001101 }
Kay Sieversb9d9c822006-06-15 15:31:56 +02001102 if (dev->class) {
Kay Sieversda231fd2007-11-21 17:29:15 +01001103 device_remove_class_symlinks(dev);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001104
Dave Youngf75b1c62008-05-28 09:28:39 -07001105 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001106 /* notify any interfaces that the device is now gone */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -07001107 list_for_each_entry(class_intf,
1108 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001109 if (class_intf->remove_dev)
1110 class_intf->remove_dev(dev, class_intf);
1111 /* remove the device from the class list */
Tejun Heo5a3ceb82008-08-25 19:50:19 +02001112 klist_del(&dev->knode_class);
Dave Youngf75b1c62008-05-28 09:28:39 -07001113 mutex_unlock(&dev->class->p->class_mutex);
Kay Sieversb9d9c822006-06-15 15:31:56 +02001114 }
Tejun Heoad6a1e12007-06-14 03:45:17 +09001115 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -07001116 device_remove_attrs(dev);
Benjamin Herrenschmidt28953532006-11-08 19:46:14 -08001117 bus_remove_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118
Tejun Heo2f8d16a2007-03-09 19:34:19 +09001119 /*
1120 * Some platform devices are driven without driver attached
1121 * and managed resources may have been acquired. Make sure
1122 * all resources are released.
1123 */
1124 devres_release_all(dev);
1125
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 /* Notify the platform of the removal, in case they
1127 * need to do anything...
1128 */
1129 if (platform_notify_remove)
1130 platform_notify_remove(dev);
Kay Sievers312c0042005-11-16 09:00:00 +01001131 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Kay Sieversda231fd2007-11-21 17:29:15 +01001132 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 kobject_del(&dev->kobj);
Kay Sieversda231fd2007-11-21 17:29:15 +01001134 put_device(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135}
1136
1137/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001138 * device_unregister - unregister device from system.
1139 * @dev: device going away.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001141 * We do this in two parts, like we do device_register(). First,
1142 * we remove it from all the subsystems with device_del(), then
1143 * we decrement the reference count via put_device(). If that
1144 * is the final reference count, the device will be cleaned up
1145 * via device_release() above. Otherwise, the structure will
1146 * stick around until the final reference to the device is dropped.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001148void device_unregister(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001150 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 device_del(dev);
1152 put_device(dev);
1153}
1154
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001155static struct device *next_device(struct klist_iter *i)
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001156{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001157 struct klist_node *n = klist_next(i);
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001158 struct device *dev = NULL;
1159 struct device_private *p;
1160
1161 if (n) {
1162 p = to_device_private_parent(n);
1163 dev = p->device;
1164 }
1165 return dev;
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001166}
1167
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168/**
Kay Sieverse454cea2009-09-18 23:01:12 +02001169 * device_get_devnode - path of device node file
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001170 * @dev: device
Kay Sieverse454cea2009-09-18 23:01:12 +02001171 * @mode: returned file access mode
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001172 * @tmp: possibly allocated string
1173 *
1174 * Return the relative path of a possible device node.
1175 * Non-default names may need to allocate a memory to compose
1176 * a name. This memory is returned in tmp and needs to be
1177 * freed by the caller.
1178 */
Kay Sieverse454cea2009-09-18 23:01:12 +02001179const char *device_get_devnode(struct device *dev,
1180 mode_t *mode, const char **tmp)
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001181{
1182 char *s;
1183
1184 *tmp = NULL;
1185
1186 /* the device type may provide a specific name */
Kay Sieverse454cea2009-09-18 23:01:12 +02001187 if (dev->type && dev->type->devnode)
1188 *tmp = dev->type->devnode(dev, mode);
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001189 if (*tmp)
1190 return *tmp;
1191
1192 /* the class may provide a specific name */
Kay Sieverse454cea2009-09-18 23:01:12 +02001193 if (dev->class && dev->class->devnode)
1194 *tmp = dev->class->devnode(dev, mode);
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001195 if (*tmp)
1196 return *tmp;
1197
1198 /* return name without allocation, tmp == NULL */
1199 if (strchr(dev_name(dev), '!') == NULL)
1200 return dev_name(dev);
1201
1202 /* replace '!' in the name with '/' */
1203 *tmp = kstrdup(dev_name(dev), GFP_KERNEL);
1204 if (!*tmp)
1205 return NULL;
1206 while ((s = strchr(*tmp, '!')))
1207 s[0] = '/';
1208 return *tmp;
1209}
1210
1211/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001212 * device_for_each_child - device child iterator.
1213 * @parent: parent struct device.
1214 * @data: data for the callback.
1215 * @fn: function to be called for each device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001217 * Iterate over @parent's child devices, and call @fn for each,
1218 * passing it @data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001220 * We check the return of @fn each time. If it returns anything
1221 * other than 0, we break out and return that value.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001223int device_for_each_child(struct device *parent, void *data,
1224 int (*fn)(struct device *dev, void *data))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225{
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001226 struct klist_iter i;
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001227 struct device *child;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 int error = 0;
1229
Greg Kroah-Hartman014c90db2009-04-15 16:00:12 -07001230 if (!parent->p)
1231 return 0;
1232
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001233 klist_iter_init(&parent->p->klist_children, &i);
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001234 while ((child = next_device(&i)) && !error)
1235 error = fn(child, data);
1236 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 return error;
1238}
1239
Cornelia Huck5ab69982006-11-16 15:42:07 +01001240/**
1241 * device_find_child - device iterator for locating a particular device.
1242 * @parent: parent struct device
1243 * @data: Data to pass to match function
1244 * @match: Callback function to check device
1245 *
1246 * This is similar to the device_for_each_child() function above, but it
1247 * returns a reference to a device that is 'found' for later use, as
1248 * determined by the @match callback.
1249 *
1250 * The callback should return 0 if the device doesn't match and non-zero
1251 * if it does. If the callback returns non-zero and a reference to the
1252 * current device can be obtained, this function will return to the caller
1253 * and not iterate over any more devices.
1254 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001255struct device *device_find_child(struct device *parent, void *data,
1256 int (*match)(struct device *dev, void *data))
Cornelia Huck5ab69982006-11-16 15:42:07 +01001257{
1258 struct klist_iter i;
1259 struct device *child;
1260
1261 if (!parent)
1262 return NULL;
1263
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001264 klist_iter_init(&parent->p->klist_children, &i);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001265 while ((child = next_device(&i)))
1266 if (match(child, data) && get_device(child))
1267 break;
1268 klist_iter_exit(&i);
1269 return child;
1270}
1271
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272int __init devices_init(void)
1273{
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -06001274 devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
1275 if (!devices_kset)
1276 return -ENOMEM;
Dan Williamse105b8b2008-04-21 10:51:07 -07001277 dev_kobj = kobject_create_and_add("dev", NULL);
1278 if (!dev_kobj)
1279 goto dev_kobj_err;
1280 sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
1281 if (!sysfs_dev_block_kobj)
1282 goto block_kobj_err;
1283 sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
1284 if (!sysfs_dev_char_kobj)
1285 goto char_kobj_err;
1286
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -06001287 return 0;
Dan Williamse105b8b2008-04-21 10:51:07 -07001288
1289 char_kobj_err:
1290 kobject_put(sysfs_dev_block_kobj);
1291 block_kobj_err:
1292 kobject_put(dev_kobj);
1293 dev_kobj_err:
1294 kset_unregister(devices_kset);
1295 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296}
1297
1298EXPORT_SYMBOL_GPL(device_for_each_child);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001299EXPORT_SYMBOL_GPL(device_find_child);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
1301EXPORT_SYMBOL_GPL(device_initialize);
1302EXPORT_SYMBOL_GPL(device_add);
1303EXPORT_SYMBOL_GPL(device_register);
1304
1305EXPORT_SYMBOL_GPL(device_del);
1306EXPORT_SYMBOL_GPL(device_unregister);
1307EXPORT_SYMBOL_GPL(get_device);
1308EXPORT_SYMBOL_GPL(put_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
1310EXPORT_SYMBOL_GPL(device_create_file);
1311EXPORT_SYMBOL_GPL(device_remove_file);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001312
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001313struct root_device
1314{
1315 struct device dev;
1316 struct module *owner;
1317};
1318
1319#define to_root_device(dev) container_of(dev, struct root_device, dev)
1320
1321static void root_device_release(struct device *dev)
1322{
1323 kfree(to_root_device(dev));
1324}
1325
1326/**
1327 * __root_device_register - allocate and register a root device
1328 * @name: root device name
1329 * @owner: owner module of the root device, usually THIS_MODULE
1330 *
1331 * This function allocates a root device and registers it
1332 * using device_register(). In order to free the returned
1333 * device, use root_device_unregister().
1334 *
1335 * Root devices are dummy devices which allow other devices
1336 * to be grouped under /sys/devices. Use this function to
1337 * allocate a root device and then use it as the parent of
1338 * any device which should appear under /sys/devices/{name}
1339 *
1340 * The /sys/devices/{name} directory will also contain a
1341 * 'module' symlink which points to the @owner directory
1342 * in sysfs.
1343 *
1344 * Note: You probably want to use root_device_register().
1345 */
1346struct device *__root_device_register(const char *name, struct module *owner)
1347{
1348 struct root_device *root;
1349 int err = -ENOMEM;
1350
1351 root = kzalloc(sizeof(struct root_device), GFP_KERNEL);
1352 if (!root)
1353 return ERR_PTR(err);
1354
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -07001355 err = dev_set_name(&root->dev, "%s", name);
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001356 if (err) {
1357 kfree(root);
1358 return ERR_PTR(err);
1359 }
1360
1361 root->dev.release = root_device_release;
1362
1363 err = device_register(&root->dev);
1364 if (err) {
1365 put_device(&root->dev);
1366 return ERR_PTR(err);
1367 }
1368
1369#ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */
1370 if (owner) {
1371 struct module_kobject *mk = &owner->mkobj;
1372
1373 err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module");
1374 if (err) {
1375 device_unregister(&root->dev);
1376 return ERR_PTR(err);
1377 }
1378 root->owner = owner;
1379 }
1380#endif
1381
1382 return &root->dev;
1383}
1384EXPORT_SYMBOL_GPL(__root_device_register);
1385
1386/**
1387 * root_device_unregister - unregister and free a root device
Randy Dunlap7cbcf222009-01-20 16:29:13 -08001388 * @dev: device going away
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001389 *
1390 * This function unregisters and cleans up a device that was created by
1391 * root_device_register().
1392 */
1393void root_device_unregister(struct device *dev)
1394{
1395 struct root_device *root = to_root_device(dev);
1396
1397 if (root->owner)
1398 sysfs_remove_link(&root->dev.kobj, "module");
1399
1400 device_unregister(dev);
1401}
1402EXPORT_SYMBOL_GPL(root_device_unregister);
1403
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001404
1405static void device_create_release(struct device *dev)
1406{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001407 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001408 kfree(dev);
1409}
1410
1411/**
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001412 * device_create_vargs - creates a device and registers it with sysfs
1413 * @class: pointer to the struct class that this device should be registered to
1414 * @parent: pointer to the parent struct device of this new device, if any
1415 * @devt: the dev_t for the char device to be added
1416 * @drvdata: the data to be added to the device for callbacks
1417 * @fmt: string for the device's name
1418 * @args: va_list for the device's name
1419 *
1420 * This function can be used by char device classes. A struct device
1421 * will be created in sysfs, registered to the specified class.
1422 *
1423 * A "dev" file will be created, showing the dev_t for the device, if
1424 * the dev_t is not 0,0.
1425 * If a pointer to a parent struct device is passed in, the newly created
1426 * struct device will be a child of that device in sysfs.
1427 * The pointer to the struct device will be returned from the call.
1428 * Any further sysfs files that might be required can be created using this
1429 * pointer.
1430 *
1431 * Note: the struct class passed to this function must have previously
1432 * been created with a call to class_create().
1433 */
1434struct device *device_create_vargs(struct class *class, struct device *parent,
1435 dev_t devt, void *drvdata, const char *fmt,
1436 va_list args)
1437{
1438 struct device *dev = NULL;
1439 int retval = -ENODEV;
1440
1441 if (class == NULL || IS_ERR(class))
1442 goto error;
1443
1444 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1445 if (!dev) {
1446 retval = -ENOMEM;
1447 goto error;
1448 }
1449
1450 dev->devt = devt;
1451 dev->class = class;
1452 dev->parent = parent;
1453 dev->release = device_create_release;
1454 dev_set_drvdata(dev, drvdata);
1455
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001456 retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
1457 if (retval)
1458 goto error;
1459
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001460 retval = device_register(dev);
1461 if (retval)
1462 goto error;
1463
1464 return dev;
1465
1466error:
Cornelia Huck286661b2008-09-03 18:26:41 +02001467 put_device(dev);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001468 return ERR_PTR(retval);
1469}
1470EXPORT_SYMBOL_GPL(device_create_vargs);
1471
1472/**
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001473 * device_create - creates a device and registers it with sysfs
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001474 * @class: pointer to the struct class that this device should be registered to
1475 * @parent: pointer to the parent struct device of this new device, if any
1476 * @devt: the dev_t for the char device to be added
1477 * @drvdata: the data to be added to the device for callbacks
1478 * @fmt: string for the device's name
1479 *
1480 * This function can be used by char device classes. A struct device
1481 * will be created in sysfs, registered to the specified class.
1482 *
1483 * A "dev" file will be created, showing the dev_t for the device, if
1484 * the dev_t is not 0,0.
1485 * If a pointer to a parent struct device is passed in, the newly created
1486 * struct device will be a child of that device in sysfs.
1487 * The pointer to the struct device will be returned from the call.
1488 * Any further sysfs files that might be required can be created using this
1489 * pointer.
1490 *
1491 * Note: the struct class passed to this function must have previously
1492 * been created with a call to class_create().
1493 */
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001494struct device *device_create(struct class *class, struct device *parent,
1495 dev_t devt, void *drvdata, const char *fmt, ...)
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001496{
1497 va_list vargs;
1498 struct device *dev;
1499
1500 va_start(vargs, fmt);
1501 dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
1502 va_end(vargs);
1503 return dev;
1504}
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001505EXPORT_SYMBOL_GPL(device_create);
Greg Kroah-Hartman8882b392008-05-15 13:44:08 -07001506
Dave Youngcd354492008-01-28 16:56:11 +08001507static int __match_devt(struct device *dev, void *data)
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001508{
Dave Youngcd354492008-01-28 16:56:11 +08001509 dev_t *devt = data;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001510
Dave Youngcd354492008-01-28 16:56:11 +08001511 return dev->devt == *devt;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001512}
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001513
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001514/**
1515 * device_destroy - removes a device that was created with device_create()
1516 * @class: pointer to the struct class that this device was registered with
1517 * @devt: the dev_t of the device that was previously registered
1518 *
1519 * This call unregisters and cleans up a device that was created with a
1520 * call to device_create().
1521 */
1522void device_destroy(struct class *class, dev_t devt)
1523{
1524 struct device *dev;
1525
Greg Kroah-Hartman695794a2008-05-22 17:21:08 -04001526 dev = class_find_device(class, NULL, &devt, __match_devt);
Dave Youngcd354492008-01-28 16:56:11 +08001527 if (dev) {
1528 put_device(dev);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001529 device_unregister(dev);
Dave Youngcd354492008-01-28 16:56:11 +08001530 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001531}
1532EXPORT_SYMBOL_GPL(device_destroy);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001533
1534/**
1535 * device_rename - renames a device
1536 * @dev: the pointer to the struct device to be renamed
1537 * @new_name: the new name of the device
Eric W. Biederman030c1d22008-05-08 14:41:00 -07001538 *
1539 * It is the responsibility of the caller to provide mutual
1540 * exclusion between two different calls of device_rename
1541 * on the same device to ensure that new_name is valid and
1542 * won't conflict with other devices.
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001543 */
1544int device_rename(struct device *dev, char *new_name)
1545{
1546 char *old_class_name = NULL;
1547 char *new_class_name = NULL;
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001548 char *old_device_name = NULL;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001549 int error;
1550
1551 dev = get_device(dev);
1552 if (!dev)
1553 return -EINVAL;
1554
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001555 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -08001556 __func__, new_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001557
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001558#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001559 if ((dev->class) && (dev->parent))
1560 old_class_name = make_class_name(dev->class->name, &dev->kobj);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001561#endif
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001562
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001563 old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001564 if (!old_device_name) {
1565 error = -ENOMEM;
1566 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001567 }
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001568
1569 error = kobject_rename(&dev->kobj, new_name);
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001570 if (error)
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001571 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001572
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001573#ifdef CONFIG_SYSFS_DEPRECATED
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001574 if (old_class_name) {
1575 new_class_name = make_class_name(dev->class->name, &dev->kobj);
1576 if (new_class_name) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001577 error = sysfs_create_link_nowarn(&dev->parent->kobj,
1578 &dev->kobj,
1579 new_class_name);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001580 if (error)
1581 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001582 sysfs_remove_link(&dev->parent->kobj, old_class_name);
1583 }
1584 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001585#else
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001586 if (dev->class) {
Cornelia Huck36ce6da2008-06-10 11:09:08 +02001587 error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj,
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001588 &dev->kobj, dev_name(dev));
Stephen Hemminger0599ad52008-05-14 22:34:16 -07001589 if (error)
1590 goto out;
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -07001591 sysfs_remove_link(&dev->class->p->class_subsys.kobj,
Greg Kroah-Hartman7c714482008-01-22 18:17:41 -05001592 old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001593 }
Kay Sievers60b8cab2007-10-26 20:07:44 +02001594#endif
1595
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001596out:
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001597 put_device(dev);
1598
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001599 kfree(new_class_name);
Jesper Juhl952ab432006-09-28 23:56:01 +02001600 kfree(old_class_name);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001601 kfree(old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001602
1603 return error;
1604}
Johannes Berga2807db2007-02-28 12:38:31 +01001605EXPORT_SYMBOL_GPL(device_rename);
Cornelia Huck8a824722006-11-20 17:07:51 +01001606
1607static int device_move_class_links(struct device *dev,
1608 struct device *old_parent,
1609 struct device *new_parent)
1610{
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001611 int error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001612#ifdef CONFIG_SYSFS_DEPRECATED
Cornelia Huck8a824722006-11-20 17:07:51 +01001613 char *class_name;
1614
1615 class_name = make_class_name(dev->class->name, &dev->kobj);
1616 if (!class_name) {
Cornelia Huckcb360bb2006-11-27 10:35:05 +01001617 error = -ENOMEM;
Cornelia Huck8a824722006-11-20 17:07:51 +01001618 goto out;
1619 }
1620 if (old_parent) {
1621 sysfs_remove_link(&dev->kobj, "device");
1622 sysfs_remove_link(&old_parent->kobj, class_name);
1623 }
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001624 if (new_parent) {
1625 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1626 "device");
1627 if (error)
1628 goto out;
1629 error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
1630 class_name);
1631 if (error)
1632 sysfs_remove_link(&dev->kobj, "device");
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001633 } else
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001634 error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001635out:
1636 kfree(class_name);
1637 return error;
1638#else
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001639 if (old_parent)
1640 sysfs_remove_link(&dev->kobj, "device");
1641 if (new_parent)
1642 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1643 "device");
1644 return error;
Cornelia Huck8a824722006-11-20 17:07:51 +01001645#endif
1646}
1647
1648/**
1649 * device_move - moves a device to a new parent
1650 * @dev: the pointer to the struct device to be moved
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001651 * @new_parent: the new parent of the device (can by NULL)
Cornelia Huckffa6a702009-03-04 12:44:00 +01001652 * @dpm_order: how to reorder the dpm_list
Cornelia Huck8a824722006-11-20 17:07:51 +01001653 */
Cornelia Huckffa6a702009-03-04 12:44:00 +01001654int device_move(struct device *dev, struct device *new_parent,
1655 enum dpm_order dpm_order)
Cornelia Huck8a824722006-11-20 17:07:51 +01001656{
1657 int error;
1658 struct device *old_parent;
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001659 struct kobject *new_parent_kobj;
Cornelia Huck8a824722006-11-20 17:07:51 +01001660
1661 dev = get_device(dev);
1662 if (!dev)
1663 return -EINVAL;
1664
Cornelia Huckffa6a702009-03-04 12:44:00 +01001665 device_pm_lock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001666 new_parent = get_device(new_parent);
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001667 new_parent_kobj = get_device_parent(dev, new_parent);
Cornelia Huck63b69712008-01-21 16:09:44 +01001668
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001669 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
1670 __func__, new_parent ? dev_name(new_parent) : "<NULL>");
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001671 error = kobject_move(&dev->kobj, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001672 if (error) {
Cornelia Huck63b69712008-01-21 16:09:44 +01001673 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001674 put_device(new_parent);
1675 goto out;
1676 }
1677 old_parent = dev->parent;
1678 dev->parent = new_parent;
1679 if (old_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001680 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001681 if (new_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001682 klist_add_tail(&dev->p->knode_parent,
1683 &new_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001684 set_dev_node(dev, dev_to_node(new_parent));
1685 }
1686
Cornelia Huck8a824722006-11-20 17:07:51 +01001687 if (!dev->class)
1688 goto out_put;
1689 error = device_move_class_links(dev, old_parent, new_parent);
1690 if (error) {
1691 /* We ignore errors on cleanup since we're hosed anyway... */
1692 device_move_class_links(dev, new_parent, old_parent);
1693 if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001694 if (new_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001695 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001696 dev->parent = old_parent;
1697 if (old_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001698 klist_add_tail(&dev->p->knode_parent,
1699 &old_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001700 set_dev_node(dev, dev_to_node(old_parent));
1701 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001702 }
Cornelia Huck63b69712008-01-21 16:09:44 +01001703 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001704 put_device(new_parent);
1705 goto out;
1706 }
Cornelia Huckffa6a702009-03-04 12:44:00 +01001707 switch (dpm_order) {
1708 case DPM_ORDER_NONE:
1709 break;
1710 case DPM_ORDER_DEV_AFTER_PARENT:
1711 device_pm_move_after(dev, new_parent);
1712 break;
1713 case DPM_ORDER_PARENT_BEFORE_DEV:
1714 device_pm_move_before(new_parent, dev);
1715 break;
1716 case DPM_ORDER_DEV_LAST:
1717 device_pm_move_last(dev);
1718 break;
1719 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001720out_put:
1721 put_device(old_parent);
1722out:
Cornelia Huckffa6a702009-03-04 12:44:00 +01001723 device_pm_unlock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001724 put_device(dev);
1725 return error;
1726}
Cornelia Huck8a824722006-11-20 17:07:51 +01001727EXPORT_SYMBOL_GPL(device_move);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001728
1729/**
1730 * device_shutdown - call ->shutdown() on each device to shutdown.
1731 */
1732void device_shutdown(void)
1733{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001734 struct device *dev, *devn;
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001735
1736 list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list,
1737 kobj.entry) {
1738 if (dev->bus && dev->bus->shutdown) {
1739 dev_dbg(dev, "shutdown\n");
1740 dev->bus->shutdown(dev);
1741 } else if (dev->driver && dev->driver->shutdown) {
1742 dev_dbg(dev, "shutdown\n");
1743 dev->driver->shutdown(dev);
1744 }
1745 }
Shaohua Li401097e2009-05-12 13:37:57 -07001746 async_synchronize_full();
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001747}