blob: 82c865452c7080d180ec6a453ab1efb3e988dac3 [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>
Dave Youngf75b1c62008-05-28 09:28:39 -070023#include <linux/mutex.h>
Shaohua Li401097e2009-05-12 13:37:57 -070024#include <linux/async.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include "base.h"
27#include "power/power.h"
28
Andi Kleene52eec12010-09-08 16:54:17 +020029#ifdef CONFIG_SYSFS_DEPRECATED
30#ifdef CONFIG_SYSFS_DEPRECATED_V2
31long sysfs_deprecated = 1;
32#else
33long sysfs_deprecated = 0;
34#endif
35static __init int sysfs_deprecated_setup(char *arg)
36{
37 return strict_strtol(arg, 10, &sysfs_deprecated);
38}
39early_param("sysfs.deprecated", sysfs_deprecated_setup);
40#endif
41
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080042int (*platform_notify)(struct device *dev) = NULL;
43int (*platform_notify_remove)(struct device *dev) = NULL;
Dan Williamse105b8b2008-04-21 10:51:07 -070044static struct kobject *dev_kobj;
45struct kobject *sysfs_dev_char_kobj;
46struct kobject *sysfs_dev_block_kobj;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -080048#ifdef CONFIG_BLOCK
49static inline int device_is_not_partition(struct device *dev)
50{
51 return !(dev->type == &part_type);
52}
53#else
54static inline int device_is_not_partition(struct device *dev)
55{
56 return 1;
57}
58#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Alan Stern3e956372006-06-16 17:10:48 -040060/**
61 * dev_driver_string - Return a device's driver name, if at all possible
62 * @dev: struct device to get the name of
63 *
64 * Will return the device's driver's name if it is bound to a device. If
65 * the device is not bound to a device, it will return the name of the bus
66 * it is attached to. If it is not attached to a bus either, an empty
67 * string will be returned.
68 */
Jean Delvarebf9ca692008-07-30 12:29:21 -070069const char *dev_driver_string(const struct device *dev)
Alan Stern3e956372006-06-16 17:10:48 -040070{
Alan Stern35899722009-12-04 11:06:57 -050071 struct device_driver *drv;
72
73 /* dev->driver can change to NULL underneath us because of unbinding,
74 * so be careful about accessing it. dev->bus and dev->class should
75 * never change once they are set, so they don't need special care.
76 */
77 drv = ACCESS_ONCE(dev->driver);
78 return drv ? drv->name :
Jean Delvarea456b702007-03-09 16:33:10 +010079 (dev->bus ? dev->bus->name :
80 (dev->class ? dev->class->name : ""));
Alan Stern3e956372006-06-16 17:10:48 -040081}
Matthew Wilcox310a9222006-09-23 23:35:04 -060082EXPORT_SYMBOL(dev_driver_string);
Alan Stern3e956372006-06-16 17:10:48 -040083
Linus Torvalds1da177e2005-04-16 15:20:36 -070084#define to_dev(obj) container_of(obj, struct device, kobj)
85#define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr)
86
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080087static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr,
88 char *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070089{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -080090 struct device_attribute *dev_attr = to_dev_attr(attr);
91 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -050092 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 if (dev_attr->show)
Yani Ioannou54b6f352005-05-17 06:39:34 -040095 ret = dev_attr->show(dev, dev_attr, buf);
Andrew Morton815d2d52008-03-04 15:09:07 -080096 if (ret >= (ssize_t)PAGE_SIZE) {
97 print_symbol("dev_attr_show: %s returned bad count\n",
98 (unsigned long)dev_attr->show);
99 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return ret;
101}
102
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800103static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr,
104 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800106 struct device_attribute *dev_attr = to_dev_attr(attr);
107 struct device *dev = to_dev(kobj);
Dmitry Torokhov4a0c20b2005-04-29 01:23:47 -0500108 ssize_t ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 if (dev_attr->store)
Yani Ioannou54b6f352005-05-17 06:39:34 -0400111 ret = dev_attr->store(dev, dev_attr, buf, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return ret;
113}
114
Emese Revfy52cf25d2010-01-19 02:58:23 +0100115static const struct sysfs_ops dev_sysfs_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 .show = dev_attr_show,
117 .store = dev_attr_store,
118};
119
120
121/**
122 * device_release - free device structure.
123 * @kobj: device's kobject.
124 *
125 * This is called once the reference count for the object
126 * reaches 0. We forward the call to the device's release
127 * method, which should handle actually freeing the structure.
128 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800129static void device_release(struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800131 struct device *dev = to_dev(kobj);
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800132 struct device_private *p = dev->p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
134 if (dev->release)
135 dev->release(dev);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200136 else if (dev->type && dev->type->release)
137 dev->type->release(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700138 else if (dev->class && dev->class->dev_release)
139 dev->class->dev_release(dev);
Arjan van de Venf810a5c2008-07-25 19:45:39 -0700140 else
141 WARN(1, KERN_ERR "Device '%s' does not have a release() "
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800142 "function, it is broken and must be fixed.\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100143 dev_name(dev));
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800144 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145}
146
Eric W. Biedermanbc451f22010-03-30 11:31:25 -0700147static const void *device_namespace(struct kobject *kobj)
148{
149 struct device *dev = to_dev(kobj);
150 const void *ns = NULL;
151
152 if (dev->class && dev->class->ns_type)
153 ns = dev->class->namespace(dev);
154
155 return ns;
156}
157
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600158static struct kobj_type device_ktype = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 .release = device_release,
160 .sysfs_ops = &dev_sysfs_ops,
Eric W. Biedermanbc451f22010-03-30 11:31:25 -0700161 .namespace = device_namespace,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162};
163
164
Kay Sievers312c0042005-11-16 09:00:00 +0100165static int dev_uevent_filter(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
167 struct kobj_type *ktype = get_ktype(kobj);
168
Greg Kroah-Hartman8f4afc42007-10-11 10:47:49 -0600169 if (ktype == &device_ktype) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 struct device *dev = to_dev(kobj);
171 if (dev->bus)
172 return 1;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700173 if (dev->class)
174 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 }
176 return 0;
177}
178
Kay Sievers312c0042005-11-16 09:00:00 +0100179static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
181 struct device *dev = to_dev(kobj);
182
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700183 if (dev->bus)
184 return dev->bus->name;
185 if (dev->class)
186 return dev->class->name;
187 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188}
189
Kay Sievers7eff2e72007-08-14 15:15:12 +0200190static int dev_uevent(struct kset *kset, struct kobject *kobj,
191 struct kobj_uevent_env *env)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
193 struct device *dev = to_dev(kobj);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 int retval = 0;
195
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200196 /* add device node properties if present */
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700197 if (MAJOR(dev->devt)) {
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200198 const char *tmp;
199 const char *name;
Kay Sieverse454cea2009-09-18 23:01:12 +0200200 mode_t mode = 0;
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200201
Kay Sievers7eff2e72007-08-14 15:15:12 +0200202 add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
203 add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
Kay Sieverse454cea2009-09-18 23:01:12 +0200204 name = device_get_devnode(dev, &mode, &tmp);
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200205 if (name) {
206 add_uevent_var(env, "DEVNAME=%s", name);
207 kfree(tmp);
Kay Sieverse454cea2009-09-18 23:01:12 +0200208 if (mode)
209 add_uevent_var(env, "DEVMODE=%#o", mode & 0777);
Kay Sievers6fcf53a2009-04-30 15:23:42 +0200210 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700211 }
212
Kay Sievers414264f2007-03-12 21:08:57 +0100213 if (dev->type && dev->type->name)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200214 add_uevent_var(env, "DEVTYPE=%s", dev->type->name);
Kay Sievers414264f2007-03-12 21:08:57 +0100215
Kay Sievers239378f2006-10-07 21:54:55 +0200216 if (dev->driver)
Kay Sievers7eff2e72007-08-14 15:15:12 +0200217 add_uevent_var(env, "DRIVER=%s", dev->driver->name);
Kay Sievers239378f2006-10-07 21:54:55 +0200218
Kay Sievers7eff2e72007-08-14 15:15:12 +0200219 /* have the bus specific function add its stuff */
Kay Sievers312c0042005-11-16 09:00:00 +0100220 if (dev->bus && dev->bus->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200221 retval = dev->bus->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200222 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800223 pr_debug("device: '%s': %s: bus uevent() returned %d\n",
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100224 dev_name(dev), __func__, retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
226
Kay Sievers7eff2e72007-08-14 15:15:12 +0200227 /* have the class specific function add its stuff */
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700228 if (dev->class && dev->class->dev_uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200229 retval = dev->class->dev_uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200230 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800231 pr_debug("device: '%s': %s: class uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100232 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800233 __func__, retval);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200234 }
235
Stefan Weileef35c22010-08-06 21:11:15 +0200236 /* have the device type specific function add its stuff */
Kay Sieversf9f852d2006-10-07 21:54:55 +0200237 if (dev->type && dev->type->uevent) {
Kay Sievers7eff2e72007-08-14 15:15:12 +0200238 retval = dev->type->uevent(dev, env);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200239 if (retval)
Greg Kroah-Hartman7dc72b22007-11-28 23:49:41 -0800240 pr_debug("device: '%s': %s: dev_type uevent() "
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100241 "returned %d\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -0800242 __func__, retval);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700243 }
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return retval;
246}
247
Emese Revfy9cd43612009-12-31 14:52:51 +0100248static const struct kset_uevent_ops device_uevent_ops = {
Kay Sievers312c0042005-11-16 09:00:00 +0100249 .filter = dev_uevent_filter,
250 .name = dev_uevent_name,
251 .uevent = dev_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252};
253
Kay Sievers16574dc2007-04-06 01:40:38 +0200254static ssize_t show_uevent(struct device *dev, struct device_attribute *attr,
255 char *buf)
256{
257 struct kobject *top_kobj;
258 struct kset *kset;
Kay Sievers7eff2e72007-08-14 15:15:12 +0200259 struct kobj_uevent_env *env = NULL;
Kay Sievers16574dc2007-04-06 01:40:38 +0200260 int i;
261 size_t count = 0;
262 int retval;
263
264 /* search the kset, the device belongs to */
265 top_kobj = &dev->kobj;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200266 while (!top_kobj->kset && top_kobj->parent)
267 top_kobj = top_kobj->parent;
Kay Sievers16574dc2007-04-06 01:40:38 +0200268 if (!top_kobj->kset)
269 goto out;
Kay Sievers5c5daf62007-08-12 20:43:55 +0200270
Kay Sievers16574dc2007-04-06 01:40:38 +0200271 kset = top_kobj->kset;
272 if (!kset->uevent_ops || !kset->uevent_ops->uevent)
273 goto out;
274
275 /* respect filter */
276 if (kset->uevent_ops && kset->uevent_ops->filter)
277 if (!kset->uevent_ops->filter(kset, &dev->kobj))
278 goto out;
279
Kay Sievers7eff2e72007-08-14 15:15:12 +0200280 env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL);
281 if (!env)
Greg Kroah-Hartmanc7308c82007-05-02 14:14:11 +0200282 return -ENOMEM;
283
Kay Sievers16574dc2007-04-06 01:40:38 +0200284 /* let the kset specific function add its keys */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200285 retval = kset->uevent_ops->uevent(kset, &dev->kobj, env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200286 if (retval)
287 goto out;
288
289 /* copy keys to file */
Kay Sievers7eff2e72007-08-14 15:15:12 +0200290 for (i = 0; i < env->envp_idx; i++)
291 count += sprintf(&buf[count], "%s\n", env->envp[i]);
Kay Sievers16574dc2007-04-06 01:40:38 +0200292out:
Kay Sievers7eff2e72007-08-14 15:15:12 +0200293 kfree(env);
Kay Sievers16574dc2007-04-06 01:40:38 +0200294 return count;
295}
296
Kay Sieversa7fd6702005-10-01 14:49:43 +0200297static ssize_t store_uevent(struct device *dev, struct device_attribute *attr,
298 const char *buf, size_t count)
299{
Kay Sievers60a96a52007-07-08 22:29:26 +0200300 enum kobject_action action;
301
Kay Sievers3f5468c2010-01-14 22:54:37 +0100302 if (kobject_action_type(buf, count, &action) == 0)
Kay Sievers60a96a52007-07-08 22:29:26 +0200303 kobject_uevent(&dev->kobj, action);
Kay Sievers3f5468c2010-01-14 22:54:37 +0100304 else
305 dev_err(dev, "uevent: unknown action-string\n");
Kay Sieversa7fd6702005-10-01 14:49:43 +0200306 return count;
307}
308
Tejun Heoad6a1e12007-06-14 03:45:17 +0900309static struct device_attribute uevent_attr =
310 __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent);
311
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500312static int device_add_attributes(struct device *dev,
313 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700314{
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700315 int error = 0;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500316 int i;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700317
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500318 if (attrs) {
319 for (i = 0; attr_name(attrs[i]); i++) {
320 error = device_create_file(dev, &attrs[i]);
321 if (error)
322 break;
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700323 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500324 if (error)
325 while (--i >= 0)
326 device_remove_file(dev, &attrs[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700327 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700328 return error;
329}
330
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500331static void device_remove_attributes(struct device *dev,
332 struct device_attribute *attrs)
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700333{
334 int i;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500335
336 if (attrs)
337 for (i = 0; attr_name(attrs[i]); i++)
338 device_remove_file(dev, &attrs[i]);
339}
340
Stefan Achatzc97415a2010-11-26 19:57:29 +0000341static int device_add_bin_attributes(struct device *dev,
342 struct bin_attribute *attrs)
343{
344 int error = 0;
345 int i;
346
347 if (attrs) {
348 for (i = 0; attr_name(attrs[i]); i++) {
349 error = device_create_bin_file(dev, &attrs[i]);
350 if (error)
351 break;
352 }
353 if (error)
354 while (--i >= 0)
355 device_remove_bin_file(dev, &attrs[i]);
356 }
357 return error;
358}
359
360static void device_remove_bin_attributes(struct device *dev,
361 struct bin_attribute *attrs)
362{
363 int i;
364
365 if (attrs)
366 for (i = 0; attr_name(attrs[i]); i++)
367 device_remove_bin_file(dev, &attrs[i]);
368}
369
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500370static int device_add_groups(struct device *dev,
David Brownella4dbd672009-06-24 10:06:31 -0700371 const struct attribute_group **groups)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500372{
373 int error = 0;
374 int i;
375
376 if (groups) {
377 for (i = 0; groups[i]; i++) {
378 error = sysfs_create_group(&dev->kobj, groups[i]);
379 if (error) {
380 while (--i >= 0)
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800381 sysfs_remove_group(&dev->kobj,
382 groups[i]);
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500383 break;
384 }
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700385 }
386 }
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500387 return error;
388}
389
390static void device_remove_groups(struct device *dev,
David Brownella4dbd672009-06-24 10:06:31 -0700391 const struct attribute_group **groups)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500392{
393 int i;
394
395 if (groups)
396 for (i = 0; groups[i]; i++)
397 sysfs_remove_group(&dev->kobj, groups[i]);
Greg Kroah-Hartmande0ff002006-06-27 00:06:09 -0700398}
399
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700400static int device_add_attrs(struct device *dev)
401{
402 struct class *class = dev->class;
Stephen Hemmingeraed65af2011-03-28 09:12:52 -0700403 const struct device_type *type = dev->type;
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500404 int error;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700405
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500406 if (class) {
407 error = device_add_attributes(dev, class->dev_attrs);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200408 if (error)
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500409 return error;
Stefan Achatzc97415a2010-11-26 19:57:29 +0000410 error = device_add_bin_attributes(dev, class->dev_bin_attrs);
411 if (error)
412 goto err_remove_class_attrs;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700413 }
Kay Sieversf9f852d2006-10-07 21:54:55 +0200414
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500415 if (type) {
416 error = device_add_groups(dev, type->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200417 if (error)
Stefan Achatzc97415a2010-11-26 19:57:29 +0000418 goto err_remove_class_bin_attrs;
Kay Sieversf9f852d2006-10-07 21:54:55 +0200419 }
420
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500421 error = device_add_groups(dev, dev->groups);
422 if (error)
423 goto err_remove_type_groups;
424
425 return 0;
426
427 err_remove_type_groups:
428 if (type)
429 device_remove_groups(dev, type->groups);
Stefan Achatzc97415a2010-11-26 19:57:29 +0000430 err_remove_class_bin_attrs:
431 if (class)
432 device_remove_bin_attributes(dev, class->dev_bin_attrs);
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500433 err_remove_class_attrs:
434 if (class)
435 device_remove_attributes(dev, class->dev_attrs);
436
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700437 return error;
438}
439
440static void device_remove_attrs(struct device *dev)
441{
442 struct class *class = dev->class;
Stephen Hemmingeraed65af2011-03-28 09:12:52 -0700443 const struct device_type *type = dev->type;
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700444
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500445 device_remove_groups(dev, dev->groups);
Kay Sieversf9f852d2006-10-07 21:54:55 +0200446
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500447 if (type)
448 device_remove_groups(dev, type->groups);
449
Stefan Achatzc97415a2010-11-26 19:57:29 +0000450 if (class) {
Dmitry Torokhov621a1672007-03-10 01:37:34 -0500451 device_remove_attributes(dev, class->dev_attrs);
Stefan Achatzc97415a2010-11-26 19:57:29 +0000452 device_remove_bin_attributes(dev, class->dev_bin_attrs);
453 }
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700454}
455
456
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700457static ssize_t show_dev(struct device *dev, struct device_attribute *attr,
458 char *buf)
459{
460 return print_dev_t(buf, dev->devt);
461}
462
Tejun Heoad6a1e12007-06-14 03:45:17 +0900463static struct device_attribute devt_attr =
464 __ATTR(dev, S_IRUGO, show_dev, NULL);
465
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600466/* kset to create /sys/devices/ */
467struct kset *devices_kset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800470 * device_create_file - create sysfs attribute file for device.
471 * @dev: device.
472 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 */
Phil Carmody26579ab2009-12-18 15:34:19 +0200474int device_create_file(struct device *dev,
475 const struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476{
477 int error = 0;
Cornelia Huck0c98b192008-01-31 10:39:38 +0100478 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 error = sysfs_create_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 return error;
481}
482
483/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800484 * device_remove_file - remove sysfs attribute file.
485 * @dev: device.
486 * @attr: device attribute descriptor.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 */
Phil Carmody26579ab2009-12-18 15:34:19 +0200488void device_remove_file(struct device *dev,
489 const struct device_attribute *attr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490{
Cornelia Huck0c98b192008-01-31 10:39:38 +0100491 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 sysfs_remove_file(&dev->kobj, &attr->attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493}
494
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700495/**
496 * device_create_bin_file - create sysfs binary attribute file for device.
497 * @dev: device.
498 * @attr: device binary attribute descriptor.
499 */
Phil Carmody66ecb922009-12-18 15:34:20 +0200500int device_create_bin_file(struct device *dev,
501 const struct bin_attribute *attr)
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700502{
503 int error = -EINVAL;
504 if (dev)
505 error = sysfs_create_bin_file(&dev->kobj, attr);
506 return error;
507}
508EXPORT_SYMBOL_GPL(device_create_bin_file);
509
510/**
511 * device_remove_bin_file - remove sysfs binary attribute file
512 * @dev: device.
513 * @attr: device binary attribute descriptor.
514 */
Phil Carmody66ecb922009-12-18 15:34:20 +0200515void device_remove_bin_file(struct device *dev,
516 const struct bin_attribute *attr)
Greg Kroah-Hartman2589f1882006-09-19 09:39:19 -0700517{
518 if (dev)
519 sysfs_remove_bin_file(&dev->kobj, attr);
520}
521EXPORT_SYMBOL_GPL(device_remove_bin_file);
522
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400523/**
Alan Stern523ded72007-04-26 00:12:04 -0700524 * device_schedule_callback_owner - helper to schedule a callback for a device
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400525 * @dev: device.
526 * @func: callback function to invoke later.
Alan Stern523ded72007-04-26 00:12:04 -0700527 * @owner: module owning the callback routine
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400528 *
529 * Attribute methods must not unregister themselves or their parent device
530 * (which would amount to the same thing). Attempts to do so will deadlock,
531 * since unregistration is mutually exclusive with driver callbacks.
532 *
533 * Instead methods can call this routine, which will attempt to allocate
534 * and schedule a workqueue request to call back @func with @dev as its
535 * argument in the workqueue's process context. @dev will be pinned until
536 * @func returns.
537 *
Alan Stern523ded72007-04-26 00:12:04 -0700538 * This routine is usually called via the inline device_schedule_callback(),
539 * which automatically sets @owner to THIS_MODULE.
540 *
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400541 * Returns 0 if the request was submitted, -ENOMEM if storage could not
Alan Stern523ded72007-04-26 00:12:04 -0700542 * be allocated, -ENODEV if a reference to @owner isn't available.
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400543 *
544 * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an
545 * underlying sysfs routine (since it is intended for use by attribute
546 * methods), and if sysfs isn't available you'll get nothing but -ENOSYS.
547 */
Alan Stern523ded72007-04-26 00:12:04 -0700548int device_schedule_callback_owner(struct device *dev,
549 void (*func)(struct device *), struct module *owner)
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400550{
551 return sysfs_schedule_callback(&dev->kobj,
Alan Stern523ded72007-04-26 00:12:04 -0700552 (void (*)(void *)) func, dev, owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400553}
Alan Stern523ded72007-04-26 00:12:04 -0700554EXPORT_SYMBOL_GPL(device_schedule_callback_owner);
Alan Sternd9a9cdf2007-03-15 15:50:34 -0400555
James Bottomley34bb61f2005-09-06 16:56:51 -0700556static void klist_children_get(struct klist_node *n)
557{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800558 struct device_private *p = to_device_private_parent(n);
559 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700560
561 get_device(dev);
562}
563
564static void klist_children_put(struct klist_node *n)
565{
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800566 struct device_private *p = to_device_private_parent(n);
567 struct device *dev = p->device;
James Bottomley34bb61f2005-09-06 16:56:51 -0700568
569 put_device(dev);
570}
571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800573 * device_initialize - init device structure.
574 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 *
Cornelia Huck57394112008-09-03 18:26:40 +0200576 * This prepares the device for use by other layers by initializing
577 * its fields.
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800578 * It is the first half of device_register(), if called by
Cornelia Huck57394112008-09-03 18:26:40 +0200579 * that function, though it can also be called separately, so one
580 * may use @dev's fields. In particular, get_device()/put_device()
581 * may be used for reference counting of @dev after calling this
582 * function.
583 *
584 * NOTE: Use put_device() to give up your reference instead of freeing
585 * @dev directly once you have called this function.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587void device_initialize(struct device *dev)
588{
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600589 dev->kobj.kset = devices_kset;
Greg Kroah-Hartmanf9cb0742007-12-17 23:05:35 -0700590 kobject_init(&dev->kobj, &device_ktype);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 INIT_LIST_HEAD(&dev->dma_pools);
Thomas Gleixner31427882010-01-29 20:39:02 +0000592 mutex_init(&dev->mutex);
Peter Zijlstra1704f472010-03-19 01:37:42 +0100593 lockdep_set_novalidate_class(&dev->mutex);
Tejun Heo9ac78492007-01-20 16:00:26 +0900594 spin_lock_init(&dev->devres_lock);
595 INIT_LIST_HEAD(&dev->devres_head);
Alan Stern3b98aea2008-08-07 13:06:12 -0400596 device_pm_init(dev);
Christoph Hellwig87348132006-12-06 20:32:33 -0800597 set_dev_node(dev, -1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598}
599
Kay Sievers86406242007-03-14 03:25:56 +0100600static struct kobject *virtual_device_parent(struct device *dev)
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700601{
Kay Sievers86406242007-03-14 03:25:56 +0100602 static struct kobject *virtual_dir = NULL;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700603
Kay Sievers86406242007-03-14 03:25:56 +0100604 if (!virtual_dir)
Greg Kroah-Hartman4ff6abf2007-11-05 22:24:43 -0800605 virtual_dir = kobject_create_and_add("virtual",
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -0600606 &devices_kset->kobj);
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700607
Kay Sievers86406242007-03-14 03:25:56 +0100608 return virtual_dir;
Greg Kroah-Hartmanf0ee61a2006-10-23 10:40:54 -0700609}
610
Eric W. Biedermanbc451f22010-03-30 11:31:25 -0700611struct class_dir {
612 struct kobject kobj;
613 struct class *class;
614};
615
616#define to_class_dir(obj) container_of(obj, struct class_dir, kobj)
617
618static void class_dir_release(struct kobject *kobj)
619{
620 struct class_dir *dir = to_class_dir(kobj);
621 kfree(dir);
622}
623
624static const
625struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj)
626{
627 struct class_dir *dir = to_class_dir(kobj);
628 return dir->class->ns_type;
629}
630
631static struct kobj_type class_dir_ktype = {
632 .release = class_dir_release,
633 .sysfs_ops = &kobj_sysfs_ops,
634 .child_ns_type = class_dir_child_ns_type
635};
636
637static struct kobject *
638class_dir_create_and_add(struct class *class, struct kobject *parent_kobj)
639{
640 struct class_dir *dir;
641 int retval;
642
643 dir = kzalloc(sizeof(*dir), GFP_KERNEL);
644 if (!dir)
645 return NULL;
646
647 dir->class = class;
648 kobject_init(&dir->kobj, &class_dir_ktype);
649
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100650 dir->kobj.kset = &class->p->glue_dirs;
Eric W. Biedermanbc451f22010-03-30 11:31:25 -0700651
652 retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name);
653 if (retval < 0) {
654 kobject_put(&dir->kobj);
655 return NULL;
656 }
657 return &dir->kobj;
658}
659
660
Kay Sieversda231fd2007-11-21 17:29:15 +0100661static struct kobject *get_device_parent(struct device *dev,
662 struct device *parent)
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100663{
Kay Sievers86406242007-03-14 03:25:56 +0100664 if (dev->class) {
Tejun Heo77d3d7c2010-02-05 17:57:02 +0900665 static DEFINE_MUTEX(gdp_mutex);
Kay Sievers86406242007-03-14 03:25:56 +0100666 struct kobject *kobj = NULL;
667 struct kobject *parent_kobj;
668 struct kobject *k;
669
Randy Dunlapead454f2010-09-24 14:36:49 -0700670#ifdef CONFIG_BLOCK
Kay Sievers39aba962010-09-04 22:33:14 -0700671 /* block disks show up in /sys/block */
Andi Kleene52eec12010-09-08 16:54:17 +0200672 if (sysfs_deprecated && dev->class == &block_class) {
Kay Sievers39aba962010-09-04 22:33:14 -0700673 if (parent && parent->class == &block_class)
674 return &parent->kobj;
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100675 return &block_class.p->subsys.kobj;
Kay Sievers39aba962010-09-04 22:33:14 -0700676 }
Randy Dunlapead454f2010-09-24 14:36:49 -0700677#endif
Andi Kleene52eec12010-09-08 16:54:17 +0200678
Kay Sievers86406242007-03-14 03:25:56 +0100679 /*
680 * If we have no parent, we live in "virtual".
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100681 * Class-devices with a non class-device as parent, live
682 * in a "glue" directory to prevent namespace collisions.
Kay Sievers86406242007-03-14 03:25:56 +0100683 */
684 if (parent == NULL)
685 parent_kobj = virtual_device_parent(dev);
Eric W. Biederman24b14422010-07-24 22:43:35 -0700686 else if (parent->class && !dev->class->ns_type)
Kay Sievers86406242007-03-14 03:25:56 +0100687 return &parent->kobj;
688 else
689 parent_kobj = &parent->kobj;
690
Tejun Heo77d3d7c2010-02-05 17:57:02 +0900691 mutex_lock(&gdp_mutex);
692
Kay Sievers86406242007-03-14 03:25:56 +0100693 /* find our class-directory at the parent and reference it */
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100694 spin_lock(&dev->class->p->glue_dirs.list_lock);
695 list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry)
Kay Sievers86406242007-03-14 03:25:56 +0100696 if (k->parent == parent_kobj) {
697 kobj = kobject_get(k);
698 break;
699 }
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100700 spin_unlock(&dev->class->p->glue_dirs.list_lock);
Tejun Heo77d3d7c2010-02-05 17:57:02 +0900701 if (kobj) {
702 mutex_unlock(&gdp_mutex);
Kay Sievers86406242007-03-14 03:25:56 +0100703 return kobj;
Tejun Heo77d3d7c2010-02-05 17:57:02 +0900704 }
Kay Sievers86406242007-03-14 03:25:56 +0100705
706 /* or create a new class-directory at the parent device */
Eric W. Biedermanbc451f22010-03-30 11:31:25 -0700707 k = class_dir_create_and_add(dev->class, parent_kobj);
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100708 /* do not emit an uevent for this simple "glue" directory */
Tejun Heo77d3d7c2010-02-05 17:57:02 +0900709 mutex_unlock(&gdp_mutex);
Greg Kroah-Hartman43968d22007-11-05 22:24:43 -0800710 return k;
Kay Sievers86406242007-03-14 03:25:56 +0100711 }
712
713 if (parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100714 return &parent->kobj;
715 return NULL;
716}
Kay Sieversda231fd2007-11-21 17:29:15 +0100717
Cornelia Huck63b69712008-01-21 16:09:44 +0100718static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir)
Kay Sieversda231fd2007-11-21 17:29:15 +0100719{
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100720 /* see if we live in a "glue" directory */
Cornelia Huckc1fe5392008-02-27 15:38:23 +0100721 if (!glue_dir || !dev->class ||
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100722 glue_dir->kset != &dev->class->p->glue_dirs)
Kay Sieversda231fd2007-11-21 17:29:15 +0100723 return;
724
Kay Sievers0f4dafc2007-12-19 01:40:42 +0100725 kobject_put(glue_dir);
Kay Sieversda231fd2007-11-21 17:29:15 +0100726}
Cornelia Huck63b69712008-01-21 16:09:44 +0100727
728static void cleanup_device_parent(struct device *dev)
729{
730 cleanup_glue_dir(dev, dev->kobj.parent);
731}
Kay Sievers86406242007-03-14 03:25:56 +0100732
Cornelia Huck63b69712008-01-21 16:09:44 +0100733static void setup_parent(struct device *dev, struct device *parent)
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100734{
735 struct kobject *kobj;
736 kobj = get_device_parent(dev, parent);
Cornelia Huckc744aeae2007-01-08 20:16:44 +0100737 if (kobj)
738 dev->kobj.parent = kobj;
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100739}
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100740
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700741static int device_add_class_symlinks(struct device *dev)
742{
743 int error;
744
745 if (!dev->class)
746 return 0;
Kay Sieversda231fd2007-11-21 17:29:15 +0100747
Greg Kroah-Hartman1fbfee62008-05-28 09:28:39 -0700748 error = sysfs_create_link(&dev->kobj,
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100749 &dev->class->p->subsys.kobj,
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700750 "subsystem");
751 if (error)
752 goto out;
Kay Sieversda231fd2007-11-21 17:29:15 +0100753
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800754 if (dev->parent && device_is_not_partition(dev)) {
Dmitry Torokhov4f01a752007-09-18 22:46:50 -0700755 error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
756 "device");
757 if (error)
Kay Sievers39aba962010-09-04 22:33:14 -0700758 goto out_subsys;
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700759 }
Kay Sievers39aba962010-09-04 22:33:14 -0700760
Randy Dunlapead454f2010-09-24 14:36:49 -0700761#ifdef CONFIG_BLOCK
Kay Sievers39aba962010-09-04 22:33:14 -0700762 /* /sys/block has directories and does not need symlinks */
Andi Kleene52eec12010-09-08 16:54:17 +0200763 if (sysfs_deprecated && dev->class == &block_class)
Kay Sievers39aba962010-09-04 22:33:14 -0700764 return 0;
Randy Dunlapead454f2010-09-24 14:36:49 -0700765#endif
Kay Sievers39aba962010-09-04 22:33:14 -0700766
767 /* link in the class directory pointing to the device */
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100768 error = sysfs_create_link(&dev->class->p->subsys.kobj,
Kay Sievers39aba962010-09-04 22:33:14 -0700769 &dev->kobj, dev_name(dev));
770 if (error)
771 goto out_device;
772
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700773 return 0;
774
Kay Sievers39aba962010-09-04 22:33:14 -0700775out_device:
776 sysfs_remove_link(&dev->kobj, "device");
Kay Sieversda231fd2007-11-21 17:29:15 +0100777
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700778out_subsys:
779 sysfs_remove_link(&dev->kobj, "subsystem");
780out:
781 return error;
782}
783
784static void device_remove_class_symlinks(struct device *dev)
785{
786 if (!dev->class)
787 return;
Kay Sieversda231fd2007-11-21 17:29:15 +0100788
Greg Kroah-Hartman4e886c22008-01-27 12:12:43 -0800789 if (dev->parent && device_is_not_partition(dev))
Kay Sieversda231fd2007-11-21 17:29:15 +0100790 sysfs_remove_link(&dev->kobj, "device");
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700791 sysfs_remove_link(&dev->kobj, "subsystem");
Randy Dunlapead454f2010-09-24 14:36:49 -0700792#ifdef CONFIG_BLOCK
Andi Kleene52eec12010-09-08 16:54:17 +0200793 if (sysfs_deprecated && dev->class == &block_class)
Kay Sievers39aba962010-09-04 22:33:14 -0700794 return;
Randy Dunlapead454f2010-09-24 14:36:49 -0700795#endif
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100796 sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev));
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700797}
798
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799/**
Stephen Rothwell413c2392008-05-30 10:16:40 +1000800 * dev_set_name - set a device name
801 * @dev: device
Randy Dunlap46232362008-06-04 21:40:43 -0700802 * @fmt: format string for the device's name
Stephen Rothwell413c2392008-05-30 10:16:40 +1000803 */
804int dev_set_name(struct device *dev, const char *fmt, ...)
805{
806 va_list vargs;
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100807 int err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000808
809 va_start(vargs, fmt);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100810 err = kobject_set_name_vargs(&dev->kobj, fmt, vargs);
Stephen Rothwell413c2392008-05-30 10:16:40 +1000811 va_end(vargs);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100812 return err;
Stephen Rothwell413c2392008-05-30 10:16:40 +1000813}
814EXPORT_SYMBOL_GPL(dev_set_name);
815
816/**
Dan Williamse105b8b2008-04-21 10:51:07 -0700817 * device_to_dev_kobj - select a /sys/dev/ directory for the device
818 * @dev: device
819 *
820 * By default we select char/ for new entries. Setting class->dev_obj
821 * to NULL prevents an entry from being created. class->dev_kobj must
822 * be set (or cleared) before any devices are registered to the class
823 * otherwise device_create_sys_dev_entry() and
824 * device_remove_sys_dev_entry() will disagree about the the presence
825 * of the link.
826 */
827static struct kobject *device_to_dev_kobj(struct device *dev)
828{
829 struct kobject *kobj;
830
831 if (dev->class)
832 kobj = dev->class->dev_kobj;
833 else
834 kobj = sysfs_dev_char_kobj;
835
836 return kobj;
837}
838
839static int device_create_sys_dev_entry(struct device *dev)
840{
841 struct kobject *kobj = device_to_dev_kobj(dev);
842 int error = 0;
843 char devt_str[15];
844
845 if (kobj) {
846 format_dev_t(devt_str, dev->devt);
847 error = sysfs_create_link(kobj, &dev->kobj, devt_str);
848 }
849
850 return error;
851}
852
853static void device_remove_sys_dev_entry(struct device *dev)
854{
855 struct kobject *kobj = device_to_dev_kobj(dev);
856 char devt_str[15];
857
858 if (kobj) {
859 format_dev_t(devt_str, dev->devt);
860 sysfs_remove_link(kobj, devt_str);
861 }
862}
863
Greg Kroah-Hartmanb4028432009-05-11 14:16:57 -0700864int device_private_init(struct device *dev)
865{
866 dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
867 if (!dev->p)
868 return -ENOMEM;
869 dev->p->device = dev;
870 klist_init(&dev->p->klist_children, klist_children_get,
871 klist_children_put);
872 return 0;
873}
874
Dan Williamse105b8b2008-04-21 10:51:07 -0700875/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800876 * device_add - add device to device hierarchy.
877 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800879 * This is part 2 of device_register(), though may be called
880 * separately _iff_ device_initialize() has been called separately.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 *
Cornelia Huck57394112008-09-03 18:26:40 +0200882 * This adds @dev to the kobject hierarchy via kobject_add(), adds it
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -0800883 * to the global and sibling lists for the device, then
884 * adds it to the other relevant subsystems of the driver model.
Cornelia Huck57394112008-09-03 18:26:40 +0200885 *
886 * NOTE: _Never_ directly free @dev after calling this function, even
887 * if it returned an error! Always use put_device() to give up your
888 * reference instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 */
890int device_add(struct device *dev)
891{
892 struct device *parent = NULL;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200893 struct class_interface *class_intf;
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700894 int error = -EINVAL;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +0100895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 dev = get_device(dev);
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700897 if (!dev)
898 goto done;
899
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800900 if (!dev->p) {
Greg Kroah-Hartmanb4028432009-05-11 14:16:57 -0700901 error = device_private_init(dev);
902 if (error)
903 goto done;
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800904 }
Greg Kroah-Hartmanfb069a52008-12-16 12:23:36 -0800905
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100906 /*
907 * for statically allocated devices, which should all be converted
908 * some day, we need to initialize the name. We prevent reading back
909 * the name, and force the use of dev_name()
910 */
911 if (dev->init_name) {
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -0700912 dev_set_name(dev, "%s", dev->init_name);
Kay Sievers1fa5ae82009-01-25 15:17:37 +0100913 dev->init_name = NULL;
914 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700915
Thomas Gleixnere6309e72009-12-10 19:32:49 +0000916 if (!dev_name(dev)) {
917 error = -EINVAL;
Kay Sievers5c8563d2009-05-28 14:24:07 -0700918 goto name_error;
Thomas Gleixnere6309e72009-12-10 19:32:49 +0000919 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
Kay Sievers1e0b2cf2008-10-30 01:36:48 +0100921 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartmanc205ef42006-08-07 22:19:37 -0700922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 parent = get_device(dev->parent);
Cornelia Huck63b69712008-01-21 16:09:44 +0100924 setup_parent(dev, parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925
Yinghai Lu0d358f22008-02-19 03:20:41 -0800926 /* use parent numa_node */
927 if (parent)
928 set_dev_node(dev, dev_to_node(parent));
929
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 /* first, register with generic layer. */
Kay Sievers8a577ff2009-04-18 15:05:45 -0700931 /* we require the name to be set before, and pass NULL */
932 error = kobject_add(&dev->kobj, dev->kobj.parent, NULL);
Greg Kroah-Hartman40fa5422006-10-24 00:37:58 +0100933 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 goto Error;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200935
Brian Walsh37022642006-08-14 22:43:19 -0700936 /* notify platform of device entry */
937 if (platform_notify)
938 platform_notify(dev);
939
Tejun Heoad6a1e12007-06-14 03:45:17 +0900940 error = device_create_file(dev, &uevent_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +0200941 if (error)
942 goto attrError;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200943
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700944 if (MAJOR(dev->devt)) {
Tejun Heoad6a1e12007-06-14 03:45:17 +0900945 error = device_create_file(dev, &devt_attr);
946 if (error)
Cornelia Hucka306eea2006-09-22 11:37:13 +0200947 goto ueventattrError;
Dan Williamse105b8b2008-04-21 10:51:07 -0700948
949 error = device_create_sys_dev_entry(dev);
950 if (error)
951 goto devtattrError;
Kay Sievers2b2af542009-04-30 15:23:42 +0200952
953 devtmpfs_create_node(dev);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -0700954 }
955
Cornelia Huck2ee97ca2007-07-18 01:43:47 -0700956 error = device_add_class_symlinks(dev);
957 if (error)
958 goto SymlinkError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700959 error = device_add_attrs(dev);
960 if (error)
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -0700961 goto AttrsError;
Cornelia Huckdc0afa82007-07-09 11:39:18 -0700962 error = bus_add_device(dev);
963 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 goto BusError;
Alan Stern3b98aea2008-08-07 13:06:12 -0400965 error = dpm_sysfs_add(dev);
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +0100966 if (error)
Alan Stern3b98aea2008-08-07 13:06:12 -0400967 goto DPMError;
968 device_pm_add(dev);
Alan Sternec0676ee2008-12-05 14:10:31 -0500969
970 /* Notify clients of device addition. This call must come
971 * after dpm_sysf_add() and before kobject_uevent().
972 */
973 if (dev->bus)
974 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
975 BUS_NOTIFY_ADD_DEVICE, dev);
976
Cornelia Huck83b5fb4c2007-03-29 11:12:11 +0200977 kobject_uevent(&dev->kobj, KOBJ_ADD);
Alan Stern2023c612009-07-30 15:27:18 -0400978 bus_probe_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -0800980 klist_add_tail(&dev->p->knode_parent,
981 &parent->p->klist_children);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700983 if (dev->class) {
Dave Youngf75b1c62008-05-28 09:28:39 -0700984 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200985 /* tie the class to the device */
Tejun Heo5a3ceb82008-08-25 19:50:19 +0200986 klist_add_tail(&dev->knode_class,
Kay Sievers6b6e39a2010-11-15 23:13:18 +0100987 &dev->class->p->klist_devices);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200988
989 /* notify any interfaces that the device is here */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -0700990 list_for_each_entry(class_intf,
991 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +0200992 if (class_intf->add_dev)
993 class_intf->add_dev(dev, class_intf);
Dave Youngf75b1c62008-05-28 09:28:39 -0700994 mutex_unlock(&dev->class->p->class_mutex);
Greg Kroah-Hartman5d9fd162006-06-22 17:17:32 -0700995 }
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -0700996done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 put_device(dev);
998 return error;
Alan Stern3b98aea2008-08-07 13:06:12 -0400999 DPMError:
Rafael J. Wysocki57eee3d2008-03-12 00:59:38 +01001000 bus_remove_device(dev);
1001 BusError:
James Simmons82f0cf92007-02-21 17:44:51 +00001002 device_remove_attrs(dev);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -07001003 AttrsError:
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001004 device_remove_class_symlinks(dev);
1005 SymlinkError:
Tejun Heoad6a1e12007-06-14 03:45:17 +09001006 if (MAJOR(dev->devt))
Kay Sieversad729562009-10-28 19:51:37 +01001007 devtmpfs_delete_node(dev);
1008 if (MAJOR(dev->devt))
Dan Williamse105b8b2008-04-21 10:51:07 -07001009 device_remove_sys_dev_entry(dev);
1010 devtattrError:
1011 if (MAJOR(dev->devt))
Tejun Heoad6a1e12007-06-14 03:45:17 +09001012 device_remove_file(dev, &devt_attr);
Cornelia Hucka306eea2006-09-22 11:37:13 +02001013 ueventattrError:
Tejun Heoad6a1e12007-06-14 03:45:17 +09001014 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001015 attrError:
Kay Sievers312c0042005-11-16 09:00:00 +01001016 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 kobject_del(&dev->kobj);
1018 Error:
Cornelia Huck63b69712008-01-21 16:09:44 +01001019 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 if (parent)
1021 put_device(parent);
Kay Sievers5c8563d2009-05-28 14:24:07 -07001022name_error:
1023 kfree(dev->p);
1024 dev->p = NULL;
Greg Kroah-Hartmanc906a482008-05-30 10:45:12 -07001025 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026}
1027
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001029 * device_register - register a device with the system.
1030 * @dev: pointer to the device structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001032 * This happens in two clean steps - initialize the device
1033 * and add it to the system. The two steps can be called
1034 * separately, but this is the easiest and most common.
1035 * I.e. you should only call the two helpers separately if
1036 * have a clearly defined need to use and refcount the device
1037 * before it is added to the hierarchy.
Cornelia Huck57394112008-09-03 18:26:40 +02001038 *
1039 * NOTE: _Never_ directly free @dev after calling this function, even
1040 * if it returned an error! Always use put_device() to give up the
1041 * reference initialized in this function instead.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043int device_register(struct device *dev)
1044{
1045 device_initialize(dev);
1046 return device_add(dev);
1047}
1048
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001050 * get_device - increment reference count for device.
1051 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001053 * This simply forwards the call to kobject_get(), though
1054 * we do take care to provide for the case that we get a NULL
1055 * pointer passed in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001057struct device *get_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058{
1059 return dev ? to_dev(kobject_get(&dev->kobj)) : NULL;
1060}
1061
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001063 * put_device - decrement reference count.
1064 * @dev: device in question.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001066void put_device(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067{
Kay Sieversedfaa7c2007-05-21 22:08:01 +02001068 /* might_sleep(); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 if (dev)
1070 kobject_put(&dev->kobj);
1071}
1072
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001074 * device_del - delete device from system.
1075 * @dev: device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001077 * This is the first part of the device unregistration
1078 * sequence. This removes the device from the lists we control
1079 * from here, has it removed from the other driver model
1080 * subsystems it was added to in device_add(), and removes it
1081 * from the kobject hierarchy.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001083 * NOTE: this should be called manually _iff_ device_add() was
1084 * also called manually.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001086void device_del(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001088 struct device *parent = dev->parent;
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001089 struct class_interface *class_intf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090
Alan Sternec0676ee2008-12-05 14:10:31 -05001091 /* Notify clients of device removal. This call must come
1092 * before dpm_sysfs_remove().
1093 */
1094 if (dev->bus)
1095 blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
1096 BUS_NOTIFY_DEL_DEVICE, dev);
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001097 device_pm_remove(dev);
Alan Stern3b98aea2008-08-07 13:06:12 -04001098 dpm_sysfs_remove(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 if (parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001100 klist_del(&dev->p->knode_parent);
Dan Williamse105b8b2008-04-21 10:51:07 -07001101 if (MAJOR(dev->devt)) {
Kay Sievers2b2af542009-04-30 15:23:42 +02001102 devtmpfs_delete_node(dev);
Dan Williamse105b8b2008-04-21 10:51:07 -07001103 device_remove_sys_dev_entry(dev);
Tejun Heoad6a1e12007-06-14 03:45:17 +09001104 device_remove_file(dev, &devt_attr);
Dan Williamse105b8b2008-04-21 10:51:07 -07001105 }
Kay Sieversb9d9c822006-06-15 15:31:56 +02001106 if (dev->class) {
Kay Sieversda231fd2007-11-21 17:29:15 +01001107 device_remove_class_symlinks(dev);
Kay Sievers99ef3ef2006-09-14 11:23:28 +02001108
Dave Youngf75b1c62008-05-28 09:28:39 -07001109 mutex_lock(&dev->class->p->class_mutex);
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001110 /* notify any interfaces that the device is now gone */
Greg Kroah-Hartman184f1f72008-05-28 09:28:39 -07001111 list_for_each_entry(class_intf,
1112 &dev->class->p->class_interfaces, node)
Greg Kroah-Hartmanc47ed212006-09-13 15:34:05 +02001113 if (class_intf->remove_dev)
1114 class_intf->remove_dev(dev, class_intf);
1115 /* remove the device from the class list */
Tejun Heo5a3ceb82008-08-25 19:50:19 +02001116 klist_del(&dev->knode_class);
Dave Youngf75b1c62008-05-28 09:28:39 -07001117 mutex_unlock(&dev->class->p->class_mutex);
Kay Sieversb9d9c822006-06-15 15:31:56 +02001118 }
Tejun Heoad6a1e12007-06-14 03:45:17 +09001119 device_remove_file(dev, &uevent_attr);
Greg Kroah-Hartman2620efe2006-06-28 16:19:58 -07001120 device_remove_attrs(dev);
Benjamin Herrenschmidt28953532006-11-08 19:46:14 -08001121 bus_remove_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122
Tejun Heo2f8d16a2007-03-09 19:34:19 +09001123 /*
1124 * Some platform devices are driven without driver attached
1125 * and managed resources may have been acquired. Make sure
1126 * all resources are released.
1127 */
1128 devres_release_all(dev);
1129
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 /* Notify the platform of the removal, in case they
1131 * need to do anything...
1132 */
1133 if (platform_notify_remove)
1134 platform_notify_remove(dev);
Kay Sievers312c0042005-11-16 09:00:00 +01001135 kobject_uevent(&dev->kobj, KOBJ_REMOVE);
Kay Sieversda231fd2007-11-21 17:29:15 +01001136 cleanup_device_parent(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 kobject_del(&dev->kobj);
Kay Sieversda231fd2007-11-21 17:29:15 +01001138 put_device(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139}
1140
1141/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001142 * device_unregister - unregister device from system.
1143 * @dev: device going away.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001145 * We do this in two parts, like we do device_register(). First,
1146 * we remove it from all the subsystems with device_del(), then
1147 * we decrement the reference count via put_device(). If that
1148 * is the final reference count, the device will be cleaned up
1149 * via device_release() above. Otherwise, the structure will
1150 * stick around until the final reference to the device is dropped.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001152void device_unregister(struct device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001154 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 device_del(dev);
1156 put_device(dev);
1157}
1158
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001159static struct device *next_device(struct klist_iter *i)
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001160{
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001161 struct klist_node *n = klist_next(i);
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001162 struct device *dev = NULL;
1163 struct device_private *p;
1164
1165 if (n) {
1166 p = to_device_private_parent(n);
1167 dev = p->device;
1168 }
1169 return dev;
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001170}
1171
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172/**
Kay Sieverse454cea2009-09-18 23:01:12 +02001173 * device_get_devnode - path of device node file
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001174 * @dev: device
Kay Sieverse454cea2009-09-18 23:01:12 +02001175 * @mode: returned file access mode
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001176 * @tmp: possibly allocated string
1177 *
1178 * Return the relative path of a possible device node.
1179 * Non-default names may need to allocate a memory to compose
1180 * a name. This memory is returned in tmp and needs to be
1181 * freed by the caller.
1182 */
Kay Sieverse454cea2009-09-18 23:01:12 +02001183const char *device_get_devnode(struct device *dev,
1184 mode_t *mode, const char **tmp)
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001185{
1186 char *s;
1187
1188 *tmp = NULL;
1189
1190 /* the device type may provide a specific name */
Kay Sieverse454cea2009-09-18 23:01:12 +02001191 if (dev->type && dev->type->devnode)
1192 *tmp = dev->type->devnode(dev, mode);
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001193 if (*tmp)
1194 return *tmp;
1195
1196 /* the class may provide a specific name */
Kay Sieverse454cea2009-09-18 23:01:12 +02001197 if (dev->class && dev->class->devnode)
1198 *tmp = dev->class->devnode(dev, mode);
Kay Sievers6fcf53a2009-04-30 15:23:42 +02001199 if (*tmp)
1200 return *tmp;
1201
1202 /* return name without allocation, tmp == NULL */
1203 if (strchr(dev_name(dev), '!') == NULL)
1204 return dev_name(dev);
1205
1206 /* replace '!' in the name with '/' */
1207 *tmp = kstrdup(dev_name(dev), GFP_KERNEL);
1208 if (!*tmp)
1209 return NULL;
1210 while ((s = strchr(*tmp, '!')))
1211 s[0] = '/';
1212 return *tmp;
1213}
1214
1215/**
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001216 * device_for_each_child - device child iterator.
1217 * @parent: parent struct device.
1218 * @data: data for the callback.
1219 * @fn: function to be called for each device.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001221 * Iterate over @parent's child devices, and call @fn for each,
1222 * passing it @data.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 *
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001224 * We check the return of @fn each time. If it returns anything
1225 * other than 0, we break out and return that value.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001227int device_for_each_child(struct device *parent, void *data,
1228 int (*fn)(struct device *dev, void *data))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229{
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001230 struct klist_iter i;
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001231 struct device *child;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 int error = 0;
1233
Greg Kroah-Hartman014c90db2009-04-15 16:00:12 -07001234 if (!parent->p)
1235 return 0;
1236
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001237 klist_iter_init(&parent->p->klist_children, &i);
mochel@digitalimplant.org36239572005-03-24 19:08:30 -08001238 while ((child = next_device(&i)) && !error)
1239 error = fn(child, data);
1240 klist_iter_exit(&i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 return error;
1242}
1243
Cornelia Huck5ab69982006-11-16 15:42:07 +01001244/**
1245 * device_find_child - device iterator for locating a particular device.
1246 * @parent: parent struct device
1247 * @data: Data to pass to match function
1248 * @match: Callback function to check device
1249 *
1250 * This is similar to the device_for_each_child() function above, but it
1251 * returns a reference to a device that is 'found' for later use, as
1252 * determined by the @match callback.
1253 *
1254 * The callback should return 0 if the device doesn't match and non-zero
1255 * if it does. If the callback returns non-zero and a reference to the
1256 * current device can be obtained, this function will return to the caller
1257 * and not iterate over any more devices.
1258 */
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001259struct device *device_find_child(struct device *parent, void *data,
1260 int (*match)(struct device *dev, void *data))
Cornelia Huck5ab69982006-11-16 15:42:07 +01001261{
1262 struct klist_iter i;
1263 struct device *child;
1264
1265 if (!parent)
1266 return NULL;
1267
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001268 klist_iter_init(&parent->p->klist_children, &i);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001269 while ((child = next_device(&i)))
1270 if (match(child, data) && get_device(child))
1271 break;
1272 klist_iter_exit(&i);
1273 return child;
1274}
1275
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276int __init devices_init(void)
1277{
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -06001278 devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL);
1279 if (!devices_kset)
1280 return -ENOMEM;
Dan Williamse105b8b2008-04-21 10:51:07 -07001281 dev_kobj = kobject_create_and_add("dev", NULL);
1282 if (!dev_kobj)
1283 goto dev_kobj_err;
1284 sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj);
1285 if (!sysfs_dev_block_kobj)
1286 goto block_kobj_err;
1287 sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);
1288 if (!sysfs_dev_char_kobj)
1289 goto char_kobj_err;
1290
Greg Kroah-Hartman881c6cfd2007-11-01 09:29:06 -06001291 return 0;
Dan Williamse105b8b2008-04-21 10:51:07 -07001292
1293 char_kobj_err:
1294 kobject_put(sysfs_dev_block_kobj);
1295 block_kobj_err:
1296 kobject_put(dev_kobj);
1297 dev_kobj_err:
1298 kset_unregister(devices_kset);
1299 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300}
1301
1302EXPORT_SYMBOL_GPL(device_for_each_child);
Cornelia Huck5ab69982006-11-16 15:42:07 +01001303EXPORT_SYMBOL_GPL(device_find_child);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
1305EXPORT_SYMBOL_GPL(device_initialize);
1306EXPORT_SYMBOL_GPL(device_add);
1307EXPORT_SYMBOL_GPL(device_register);
1308
1309EXPORT_SYMBOL_GPL(device_del);
1310EXPORT_SYMBOL_GPL(device_unregister);
1311EXPORT_SYMBOL_GPL(get_device);
1312EXPORT_SYMBOL_GPL(put_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
1314EXPORT_SYMBOL_GPL(device_create_file);
1315EXPORT_SYMBOL_GPL(device_remove_file);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001316
Karthigan Srinivasan7f100d12011-04-18 16:16:52 -05001317struct root_device {
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001318 struct device dev;
1319 struct module *owner;
1320};
1321
Ferenc Wagner481e2072011-01-07 15:17:47 +01001322inline struct root_device *to_root_device(struct device *d)
1323{
1324 return container_of(d, struct root_device, dev);
1325}
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001326
1327static void root_device_release(struct device *dev)
1328{
1329 kfree(to_root_device(dev));
1330}
1331
1332/**
1333 * __root_device_register - allocate and register a root device
1334 * @name: root device name
1335 * @owner: owner module of the root device, usually THIS_MODULE
1336 *
1337 * This function allocates a root device and registers it
1338 * using device_register(). In order to free the returned
1339 * device, use root_device_unregister().
1340 *
1341 * Root devices are dummy devices which allow other devices
1342 * to be grouped under /sys/devices. Use this function to
1343 * allocate a root device and then use it as the parent of
1344 * any device which should appear under /sys/devices/{name}
1345 *
1346 * The /sys/devices/{name} directory will also contain a
1347 * 'module' symlink which points to the @owner directory
1348 * in sysfs.
1349 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +02001350 * Returns &struct device pointer on success, or ERR_PTR() on error.
1351 *
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001352 * Note: You probably want to use root_device_register().
1353 */
1354struct device *__root_device_register(const char *name, struct module *owner)
1355{
1356 struct root_device *root;
1357 int err = -ENOMEM;
1358
1359 root = kzalloc(sizeof(struct root_device), GFP_KERNEL);
1360 if (!root)
1361 return ERR_PTR(err);
1362
Greg Kroah-Hartmanacc0e902009-06-02 15:39:55 -07001363 err = dev_set_name(&root->dev, "%s", name);
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001364 if (err) {
1365 kfree(root);
1366 return ERR_PTR(err);
1367 }
1368
1369 root->dev.release = root_device_release;
1370
1371 err = device_register(&root->dev);
1372 if (err) {
1373 put_device(&root->dev);
1374 return ERR_PTR(err);
1375 }
1376
Christoph Egger1d9e8822010-05-17 16:57:58 +02001377#ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001378 if (owner) {
1379 struct module_kobject *mk = &owner->mkobj;
1380
1381 err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module");
1382 if (err) {
1383 device_unregister(&root->dev);
1384 return ERR_PTR(err);
1385 }
1386 root->owner = owner;
1387 }
1388#endif
1389
1390 return &root->dev;
1391}
1392EXPORT_SYMBOL_GPL(__root_device_register);
1393
1394/**
1395 * root_device_unregister - unregister and free a root device
Randy Dunlap7cbcf222009-01-20 16:29:13 -08001396 * @dev: device going away
Mark McLoughlin0aa0dc42008-12-15 12:58:26 +00001397 *
1398 * This function unregisters and cleans up a device that was created by
1399 * root_device_register().
1400 */
1401void root_device_unregister(struct device *dev)
1402{
1403 struct root_device *root = to_root_device(dev);
1404
1405 if (root->owner)
1406 sysfs_remove_link(&root->dev.kobj, "module");
1407
1408 device_unregister(dev);
1409}
1410EXPORT_SYMBOL_GPL(root_device_unregister);
1411
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001412
1413static void device_create_release(struct device *dev)
1414{
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001415 pr_debug("device: '%s': %s\n", dev_name(dev), __func__);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001416 kfree(dev);
1417}
1418
1419/**
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001420 * device_create_vargs - creates a device and registers it with sysfs
1421 * @class: pointer to the struct class that this device should be registered to
1422 * @parent: pointer to the parent struct device of this new device, if any
1423 * @devt: the dev_t for the char device to be added
1424 * @drvdata: the data to be added to the device for callbacks
1425 * @fmt: string for the device's name
1426 * @args: va_list for the device's name
1427 *
1428 * This function can be used by char device classes. A struct device
1429 * will be created in sysfs, registered to the specified class.
1430 *
1431 * A "dev" file will be created, showing the dev_t for the device, if
1432 * the dev_t is not 0,0.
1433 * If a pointer to a parent struct device is passed in, the newly created
1434 * struct device will be a child of that device in sysfs.
1435 * The pointer to the struct device will be returned from the call.
1436 * Any further sysfs files that might be required can be created using this
1437 * pointer.
1438 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +02001439 * Returns &struct device pointer on success, or ERR_PTR() on error.
1440 *
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001441 * Note: the struct class passed to this function must have previously
1442 * been created with a call to class_create().
1443 */
1444struct device *device_create_vargs(struct class *class, struct device *parent,
1445 dev_t devt, void *drvdata, const char *fmt,
1446 va_list args)
1447{
1448 struct device *dev = NULL;
1449 int retval = -ENODEV;
1450
1451 if (class == NULL || IS_ERR(class))
1452 goto error;
1453
1454 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1455 if (!dev) {
1456 retval = -ENOMEM;
1457 goto error;
1458 }
1459
1460 dev->devt = devt;
1461 dev->class = class;
1462 dev->parent = parent;
1463 dev->release = device_create_release;
1464 dev_set_drvdata(dev, drvdata);
1465
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001466 retval = kobject_set_name_vargs(&dev->kobj, fmt, args);
1467 if (retval)
1468 goto error;
1469
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001470 retval = device_register(dev);
1471 if (retval)
1472 goto error;
1473
1474 return dev;
1475
1476error:
Cornelia Huck286661b2008-09-03 18:26:41 +02001477 put_device(dev);
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001478 return ERR_PTR(retval);
1479}
1480EXPORT_SYMBOL_GPL(device_create_vargs);
1481
1482/**
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001483 * device_create - creates a device and registers it with sysfs
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001484 * @class: pointer to the struct class that this device should be registered to
1485 * @parent: pointer to the parent struct device of this new device, if any
1486 * @devt: the dev_t for the char device to be added
1487 * @drvdata: the data to be added to the device for callbacks
1488 * @fmt: string for the device's name
1489 *
1490 * This function can be used by char device classes. A struct device
1491 * will be created in sysfs, registered to the specified class.
1492 *
1493 * A "dev" file will be created, showing the dev_t for the device, if
1494 * the dev_t is not 0,0.
1495 * If a pointer to a parent struct device is passed in, the newly created
1496 * struct device will be a child of that device in sysfs.
1497 * The pointer to the struct device will be returned from the call.
1498 * Any further sysfs files that might be required can be created using this
1499 * pointer.
1500 *
Jani Nikulaf0eae0e2010-03-11 18:11:45 +02001501 * Returns &struct device pointer on success, or ERR_PTR() on error.
1502 *
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001503 * Note: the struct class passed to this function must have previously
1504 * been created with a call to class_create().
1505 */
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001506struct device *device_create(struct class *class, struct device *parent,
1507 dev_t devt, void *drvdata, const char *fmt, ...)
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001508{
1509 va_list vargs;
1510 struct device *dev;
1511
1512 va_start(vargs, fmt);
1513 dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
1514 va_end(vargs);
1515 return dev;
1516}
Greg Kroah-Hartman4e106732008-07-21 20:03:34 -07001517EXPORT_SYMBOL_GPL(device_create);
Greg Kroah-Hartman8882b3942008-05-15 13:44:08 -07001518
Dave Youngcd354492008-01-28 16:56:11 +08001519static int __match_devt(struct device *dev, void *data)
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001520{
Dave Youngcd354492008-01-28 16:56:11 +08001521 dev_t *devt = data;
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001522
Dave Youngcd354492008-01-28 16:56:11 +08001523 return dev->devt == *devt;
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001524}
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001525
Rafael J. Wysocki775b64d2008-01-12 20:40:46 +01001526/**
1527 * device_destroy - removes a device that was created with device_create()
1528 * @class: pointer to the struct class that this device was registered with
1529 * @devt: the dev_t of the device that was previously registered
1530 *
1531 * This call unregisters and cleans up a device that was created with a
1532 * call to device_create().
1533 */
1534void device_destroy(struct class *class, dev_t devt)
1535{
1536 struct device *dev;
1537
Greg Kroah-Hartman695794a2008-05-22 17:21:08 -04001538 dev = class_find_device(class, NULL, &devt, __match_devt);
Dave Youngcd354492008-01-28 16:56:11 +08001539 if (dev) {
1540 put_device(dev);
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001541 device_unregister(dev);
Dave Youngcd354492008-01-28 16:56:11 +08001542 }
Greg Kroah-Hartman23681e42006-06-14 12:14:34 -07001543}
1544EXPORT_SYMBOL_GPL(device_destroy);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001545
1546/**
1547 * device_rename - renames a device
1548 * @dev: the pointer to the struct device to be renamed
1549 * @new_name: the new name of the device
Eric W. Biederman030c1d22008-05-08 14:41:00 -07001550 *
1551 * It is the responsibility of the caller to provide mutual
1552 * exclusion between two different calls of device_rename
1553 * on the same device to ensure that new_name is valid and
1554 * won't conflict with other devices.
Michael Ellermanc6c0ac62010-11-25 09:44:07 +11001555 *
Timur Tabia5462512010-12-13 14:08:52 -06001556 * Note: Don't call this function. Currently, the networking layer calls this
1557 * function, but that will change. The following text from Kay Sievers offers
1558 * some insight:
1559 *
1560 * Renaming devices is racy at many levels, symlinks and other stuff are not
1561 * replaced atomically, and you get a "move" uevent, but it's not easy to
1562 * connect the event to the old and new device. Device nodes are not renamed at
1563 * all, there isn't even support for that in the kernel now.
1564 *
1565 * In the meantime, during renaming, your target name might be taken by another
1566 * driver, creating conflicts. Or the old name is taken directly after you
1567 * renamed it -- then you get events for the same DEVPATH, before you even see
1568 * the "move" event. It's just a mess, and nothing new should ever rely on
1569 * kernel device renaming. Besides that, it's not even implemented now for
1570 * other things than (driver-core wise very simple) network devices.
1571 *
1572 * We are currently about to change network renaming in udev to completely
1573 * disallow renaming of devices in the same namespace as the kernel uses,
1574 * because we can't solve the problems properly, that arise with swapping names
1575 * of multiple interfaces without races. Means, renaming of eth[0-9]* will only
1576 * be allowed to some other name than eth[0-9]*, for the aforementioned
1577 * reasons.
1578 *
1579 * Make up a "real" name in the driver before you register anything, or add
1580 * some other attributes for userspace to find the device, or use udev to add
1581 * symlinks -- but never rename kernel devices later, it's a complete mess. We
1582 * don't even want to get into that and try to implement the missing pieces in
1583 * the core. We really have other pieces to fix in the driver core mess. :)
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001584 */
Johannes Berg6937e8f2010-08-05 17:38:18 +02001585int device_rename(struct device *dev, const char *new_name)
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001586{
1587 char *old_class_name = NULL;
1588 char *new_class_name = NULL;
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001589 char *old_device_name = NULL;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001590 int error;
1591
1592 dev = get_device(dev);
1593 if (!dev)
1594 return -EINVAL;
1595
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001596 pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
Harvey Harrison2b3a3022008-03-04 16:41:05 -08001597 __func__, new_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001598
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001599 old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001600 if (!old_device_name) {
1601 error = -ENOMEM;
1602 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001603 }
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001604
Eric W. Biedermanf349cf32010-03-30 11:31:29 -07001605 if (dev->class) {
Kay Sievers6b6e39a2010-11-15 23:13:18 +01001606 error = sysfs_rename_link(&dev->class->p->subsys.kobj,
Eric W. Biedermanf349cf32010-03-30 11:31:29 -07001607 &dev->kobj, old_device_name, new_name);
1608 if (error)
1609 goto out;
1610 }
Kay Sievers39aba962010-09-04 22:33:14 -07001611
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001612 error = kobject_rename(&dev->kobj, new_name);
Kay Sievers1fa5ae82009-01-25 15:17:37 +01001613 if (error)
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001614 goto out;
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001615
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001616out:
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001617 put_device(dev);
1618
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001619 kfree(new_class_name);
Jesper Juhl952ab432006-09-28 23:56:01 +02001620 kfree(old_class_name);
Cornelia Huck2ee97ca2007-07-18 01:43:47 -07001621 kfree(old_device_name);
Greg Kroah-Hartmana2de48c2006-07-03 14:31:12 -07001622
1623 return error;
1624}
Johannes Berga2807db2007-02-28 12:38:31 +01001625EXPORT_SYMBOL_GPL(device_rename);
Cornelia Huck8a824722006-11-20 17:07:51 +01001626
1627static int device_move_class_links(struct device *dev,
1628 struct device *old_parent,
1629 struct device *new_parent)
1630{
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001631 int error = 0;
Cornelia Huck8a824722006-11-20 17:07:51 +01001632
Greg Kroah-Hartmanf7f34612007-03-06 12:55:53 -08001633 if (old_parent)
1634 sysfs_remove_link(&dev->kobj, "device");
1635 if (new_parent)
1636 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
1637 "device");
1638 return error;
Cornelia Huck8a824722006-11-20 17:07:51 +01001639}
1640
1641/**
1642 * device_move - moves a device to a new parent
1643 * @dev: the pointer to the struct device to be moved
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001644 * @new_parent: the new parent of the device (can by NULL)
Cornelia Huckffa6a702009-03-04 12:44:00 +01001645 * @dpm_order: how to reorder the dpm_list
Cornelia Huck8a824722006-11-20 17:07:51 +01001646 */
Cornelia Huckffa6a702009-03-04 12:44:00 +01001647int device_move(struct device *dev, struct device *new_parent,
1648 enum dpm_order dpm_order)
Cornelia Huck8a824722006-11-20 17:07:51 +01001649{
1650 int error;
1651 struct device *old_parent;
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001652 struct kobject *new_parent_kobj;
Cornelia Huck8a824722006-11-20 17:07:51 +01001653
1654 dev = get_device(dev);
1655 if (!dev)
1656 return -EINVAL;
1657
Cornelia Huckffa6a702009-03-04 12:44:00 +01001658 device_pm_lock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001659 new_parent = get_device(new_parent);
Greg Kroah-Hartman4a3ad202008-01-24 22:50:12 -08001660 new_parent_kobj = get_device_parent(dev, new_parent);
Cornelia Huck63b69712008-01-21 16:09:44 +01001661
Kay Sievers1e0b2cf2008-10-30 01:36:48 +01001662 pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev),
1663 __func__, new_parent ? dev_name(new_parent) : "<NULL>");
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001664 error = kobject_move(&dev->kobj, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001665 if (error) {
Cornelia Huck63b69712008-01-21 16:09:44 +01001666 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001667 put_device(new_parent);
1668 goto out;
1669 }
1670 old_parent = dev->parent;
1671 dev->parent = new_parent;
1672 if (old_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001673 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001674 if (new_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001675 klist_add_tail(&dev->p->knode_parent,
1676 &new_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001677 set_dev_node(dev, dev_to_node(new_parent));
1678 }
1679
Cornelia Huck8a824722006-11-20 17:07:51 +01001680 if (!dev->class)
1681 goto out_put;
1682 error = device_move_class_links(dev, old_parent, new_parent);
1683 if (error) {
1684 /* We ignore errors on cleanup since we're hosed anyway... */
1685 device_move_class_links(dev, new_parent, old_parent);
1686 if (!kobject_move(&dev->kobj, &old_parent->kobj)) {
Cornelia Huckc744aeae2007-01-08 20:16:44 +01001687 if (new_parent)
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001688 klist_remove(&dev->p->knode_parent);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001689 dev->parent = old_parent;
1690 if (old_parent) {
Greg Kroah-Hartmanf791b8c2008-12-16 12:24:56 -08001691 klist_add_tail(&dev->p->knode_parent,
1692 &old_parent->p->klist_children);
Yinghai Lu0d358f22008-02-19 03:20:41 -08001693 set_dev_node(dev, dev_to_node(old_parent));
1694 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001695 }
Cornelia Huck63b69712008-01-21 16:09:44 +01001696 cleanup_glue_dir(dev, new_parent_kobj);
Cornelia Huck8a824722006-11-20 17:07:51 +01001697 put_device(new_parent);
1698 goto out;
1699 }
Cornelia Huckffa6a702009-03-04 12:44:00 +01001700 switch (dpm_order) {
1701 case DPM_ORDER_NONE:
1702 break;
1703 case DPM_ORDER_DEV_AFTER_PARENT:
1704 device_pm_move_after(dev, new_parent);
1705 break;
1706 case DPM_ORDER_PARENT_BEFORE_DEV:
1707 device_pm_move_before(new_parent, dev);
1708 break;
1709 case DPM_ORDER_DEV_LAST:
1710 device_pm_move_last(dev);
1711 break;
1712 }
Cornelia Huck8a824722006-11-20 17:07:51 +01001713out_put:
1714 put_device(old_parent);
1715out:
Cornelia Huckffa6a702009-03-04 12:44:00 +01001716 device_pm_unlock();
Cornelia Huck8a824722006-11-20 17:07:51 +01001717 put_device(dev);
1718 return error;
1719}
Cornelia Huck8a824722006-11-20 17:07:51 +01001720EXPORT_SYMBOL_GPL(device_move);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001721
1722/**
1723 * device_shutdown - call ->shutdown() on each device to shutdown.
1724 */
1725void device_shutdown(void)
1726{
Hugh Daschbach62458382010-03-22 10:36:37 -07001727 struct device *dev;
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001728
Hugh Daschbach62458382010-03-22 10:36:37 -07001729 spin_lock(&devices_kset->list_lock);
1730 /*
1731 * Walk the devices list backward, shutting down each in turn.
1732 * Beware that device unplug events may also start pulling
1733 * devices offline, even as the system is shutting down.
1734 */
1735 while (!list_empty(&devices_kset->list)) {
1736 dev = list_entry(devices_kset->list.prev, struct device,
1737 kobj.entry);
1738 get_device(dev);
1739 /*
1740 * Make sure the device is off the kset list, in the
1741 * event that dev->*->shutdown() doesn't remove it.
1742 */
1743 list_del_init(&dev->kobj.entry);
1744 spin_unlock(&devices_kset->list_lock);
1745
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001746 if (dev->bus && dev->bus->shutdown) {
1747 dev_dbg(dev, "shutdown\n");
1748 dev->bus->shutdown(dev);
1749 } else if (dev->driver && dev->driver->shutdown) {
1750 dev_dbg(dev, "shutdown\n");
1751 dev->driver->shutdown(dev);
1752 }
Hugh Daschbach62458382010-03-22 10:36:37 -07001753 put_device(dev);
1754
1755 spin_lock(&devices_kset->list_lock);
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001756 }
Hugh Daschbach62458382010-03-22 10:36:37 -07001757 spin_unlock(&devices_kset->list_lock);
Shaohua Li401097e2009-05-12 13:37:57 -07001758 async_synchronize_full();
Greg Kroah-Hartman37b0c022007-11-26 22:11:55 -08001759}
Joe Perches99bcf212010-06-27 01:02:34 +00001760
1761/*
1762 * Device logging functions
1763 */
1764
1765#ifdef CONFIG_PRINTK
1766
Joe Perchescbc46632011-08-11 14:36:21 -04001767int __dev_printk(const char *level, const struct device *dev,
1768 struct va_format *vaf)
Joe Perches99bcf212010-06-27 01:02:34 +00001769{
1770 if (!dev)
1771 return printk("%s(NULL device *): %pV", level, vaf);
1772
1773 return printk("%s%s %s: %pV",
1774 level, dev_driver_string(dev), dev_name(dev), vaf);
1775}
Joe Perchescbc46632011-08-11 14:36:21 -04001776EXPORT_SYMBOL(__dev_printk);
Joe Perches99bcf212010-06-27 01:02:34 +00001777
1778int dev_printk(const char *level, const struct device *dev,
1779 const char *fmt, ...)
1780{
1781 struct va_format vaf;
1782 va_list args;
1783 int r;
1784
1785 va_start(args, fmt);
1786
1787 vaf.fmt = fmt;
1788 vaf.va = &args;
1789
1790 r = __dev_printk(level, dev, &vaf);
1791 va_end(args);
1792
1793 return r;
1794}
1795EXPORT_SYMBOL(dev_printk);
1796
1797#define define_dev_printk_level(func, kern_level) \
1798int func(const struct device *dev, const char *fmt, ...) \
1799{ \
1800 struct va_format vaf; \
1801 va_list args; \
1802 int r; \
1803 \
1804 va_start(args, fmt); \
1805 \
1806 vaf.fmt = fmt; \
1807 vaf.va = &args; \
1808 \
1809 r = __dev_printk(kern_level, dev, &vaf); \
1810 va_end(args); \
1811 \
1812 return r; \
1813} \
1814EXPORT_SYMBOL(func);
1815
1816define_dev_printk_level(dev_emerg, KERN_EMERG);
1817define_dev_printk_level(dev_alert, KERN_ALERT);
1818define_dev_printk_level(dev_crit, KERN_CRIT);
1819define_dev_printk_level(dev_err, KERN_ERR);
1820define_dev_printk_level(dev_warn, KERN_WARNING);
1821define_dev_printk_level(dev_notice, KERN_NOTICE);
1822define_dev_printk_level(_dev_info, KERN_INFO);
1823
1824#endif