Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 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-Hartman | 64bb5d2 | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 6 | * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
| 7 | * Copyright (c) 2006 Novell, Inc. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * This file is released under the GPLv2 |
| 10 | * |
| 11 | */ |
| 12 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #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-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 19 | #include <linux/kdev_t.h> |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 20 | #include <linux/notifier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #include <asm/semaphore.h> |
| 23 | |
| 24 | #include "base.h" |
| 25 | #include "power/power.h" |
| 26 | |
| 27 | int (*platform_notify)(struct device * dev) = NULL; |
| 28 | int (*platform_notify_remove)(struct device * dev) = NULL; |
| 29 | |
| 30 | /* |
| 31 | * sysfs bindings for devices. |
| 32 | */ |
| 33 | |
Alan Stern | 3e95637 | 2006-06-16 17:10:48 -0400 | [diff] [blame] | 34 | /** |
| 35 | * dev_driver_string - Return a device's driver name, if at all possible |
| 36 | * @dev: struct device to get the name of |
| 37 | * |
| 38 | * Will return the device's driver's name if it is bound to a device. If |
| 39 | * the device is not bound to a device, it will return the name of the bus |
| 40 | * it is attached to. If it is not attached to a bus either, an empty |
| 41 | * string will be returned. |
| 42 | */ |
| 43 | const char *dev_driver_string(struct device *dev) |
| 44 | { |
| 45 | return dev->driver ? dev->driver->name : |
Jean Delvare | a456b70 | 2007-03-09 16:33:10 +0100 | [diff] [blame] | 46 | (dev->bus ? dev->bus->name : |
| 47 | (dev->class ? dev->class->name : "")); |
Alan Stern | 3e95637 | 2006-06-16 17:10:48 -0400 | [diff] [blame] | 48 | } |
Matthew Wilcox | 310a922 | 2006-09-23 23:35:04 -0600 | [diff] [blame] | 49 | EXPORT_SYMBOL(dev_driver_string); |
Alan Stern | 3e95637 | 2006-06-16 17:10:48 -0400 | [diff] [blame] | 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #define to_dev(obj) container_of(obj, struct device, kobj) |
| 52 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
| 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | static ssize_t |
| 55 | dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) |
| 56 | { |
| 57 | struct device_attribute * dev_attr = to_dev_attr(attr); |
| 58 | struct device * dev = to_dev(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 59 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
| 61 | if (dev_attr->show) |
Yani Ioannou | 54b6f35 | 2005-05-17 06:39:34 -0400 | [diff] [blame] | 62 | ret = dev_attr->show(dev, dev_attr, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | return ret; |
| 64 | } |
| 65 | |
| 66 | static ssize_t |
| 67 | dev_attr_store(struct kobject * kobj, struct attribute * attr, |
| 68 | const char * buf, size_t count) |
| 69 | { |
| 70 | struct device_attribute * dev_attr = to_dev_attr(attr); |
| 71 | struct device * dev = to_dev(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 72 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
| 74 | if (dev_attr->store) |
Yani Ioannou | 54b6f35 | 2005-05-17 06:39:34 -0400 | [diff] [blame] | 75 | ret = dev_attr->store(dev, dev_attr, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | return ret; |
| 77 | } |
| 78 | |
| 79 | static struct sysfs_ops dev_sysfs_ops = { |
| 80 | .show = dev_attr_show, |
| 81 | .store = dev_attr_store, |
| 82 | }; |
| 83 | |
| 84 | |
| 85 | /** |
| 86 | * device_release - free device structure. |
| 87 | * @kobj: device's kobject. |
| 88 | * |
| 89 | * This is called once the reference count for the object |
| 90 | * reaches 0. We forward the call to the device's release |
| 91 | * method, which should handle actually freeing the structure. |
| 92 | */ |
| 93 | static void device_release(struct kobject * kobj) |
| 94 | { |
| 95 | struct device * dev = to_dev(kobj); |
| 96 | |
| 97 | if (dev->release) |
| 98 | dev->release(dev); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 99 | else if (dev->type && dev->type->release) |
| 100 | dev->type->release(dev); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 101 | else if (dev->class && dev->class->dev_release) |
| 102 | dev->class->dev_release(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | else { |
| 104 | printk(KERN_ERR "Device '%s' does not have a release() function, " |
| 105 | "it is broken and must be fixed.\n", |
| 106 | dev->bus_id); |
| 107 | WARN_ON(1); |
| 108 | } |
| 109 | } |
| 110 | |
Greg Kroah-Hartman | 8f4afc4 | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 111 | static struct kobj_type device_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | .release = device_release, |
| 113 | .sysfs_ops = &dev_sysfs_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | }; |
| 115 | |
| 116 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 117 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
| 119 | struct kobj_type *ktype = get_ktype(kobj); |
| 120 | |
Greg Kroah-Hartman | 8f4afc4 | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 121 | if (ktype == &device_ktype) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | struct device *dev = to_dev(kobj); |
Cornelia Huck | 83b5fb4c | 2007-03-29 11:12:11 +0200 | [diff] [blame] | 123 | if (dev->uevent_suppress) |
| 124 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | if (dev->bus) |
| 126 | return 1; |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 127 | if (dev->class) |
| 128 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | } |
| 130 | return 0; |
| 131 | } |
| 132 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 133 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
| 135 | struct device *dev = to_dev(kobj); |
| 136 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 137 | if (dev->bus) |
| 138 | return dev->bus->name; |
| 139 | if (dev->class) |
| 140 | return dev->class->name; |
| 141 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
| 143 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 144 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
| 145 | struct kobj_uevent_env *env) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
| 147 | struct device *dev = to_dev(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | int retval = 0; |
| 149 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 150 | /* add the major/minor if present */ |
| 151 | if (MAJOR(dev->devt)) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 152 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
| 153 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Kay Sievers | 414264f | 2007-03-12 21:08:57 +0100 | [diff] [blame] | 156 | if (dev->type && dev->type->name) |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 157 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
Kay Sievers | 414264f | 2007-03-12 21:08:57 +0100 | [diff] [blame] | 158 | |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 159 | if (dev->driver) |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 160 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 161 | |
Kay Sievers | a87cb2a | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 162 | #ifdef CONFIG_SYSFS_DEPRECATED |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 163 | if (dev->class) { |
| 164 | struct device *parent = dev->parent; |
| 165 | |
| 166 | /* find first bus device in parent chain */ |
| 167 | while (parent && !parent->bus) |
| 168 | parent = parent->parent; |
| 169 | if (parent && parent->bus) { |
| 170 | const char *path; |
| 171 | |
| 172 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); |
Kay Sievers | 2c7afd1 | 2007-05-01 13:46:26 +0200 | [diff] [blame] | 173 | if (path) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 174 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
Kay Sievers | 2c7afd1 | 2007-05-01 13:46:26 +0200 | [diff] [blame] | 175 | kfree(path); |
| 176 | } |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 177 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 178 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 179 | |
| 180 | if (parent->driver) |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 181 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
| 182 | parent->driver->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 183 | } |
| 184 | } else if (dev->bus) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 185 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 186 | |
| 187 | if (dev->driver) |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 188 | add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); |
Kay Sievers | d81d9d6 | 2006-08-13 06:17:09 +0200 | [diff] [blame] | 189 | } |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 190 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 192 | /* have the bus specific function add its stuff */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 193 | if (dev->bus && dev->bus->uevent) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 194 | retval = dev->bus->uevent(dev, env); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 195 | if (retval) |
| 196 | pr_debug ("%s: bus uevent() returned %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | __FUNCTION__, retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | } |
| 199 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 200 | /* have the class specific function add its stuff */ |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 201 | if (dev->class && dev->class->dev_uevent) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 202 | retval = dev->class->dev_uevent(dev, env); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 203 | if (retval) |
| 204 | pr_debug("%s: class uevent() returned %d\n", |
| 205 | __FUNCTION__, retval); |
| 206 | } |
| 207 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 208 | /* have the device type specific fuction add its stuff */ |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 209 | if (dev->type && dev->type->uevent) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 210 | retval = dev->type->uevent(dev, env); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 211 | if (retval) |
| 212 | pr_debug("%s: dev_type uevent() returned %d\n", |
| 213 | __FUNCTION__, retval); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 214 | } |
| 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | return retval; |
| 217 | } |
| 218 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 219 | static struct kset_uevent_ops device_uevent_ops = { |
| 220 | .filter = dev_uevent_filter, |
| 221 | .name = dev_uevent_name, |
| 222 | .uevent = dev_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | }; |
| 224 | |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 225 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
| 226 | char *buf) |
| 227 | { |
| 228 | struct kobject *top_kobj; |
| 229 | struct kset *kset; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 230 | struct kobj_uevent_env *env = NULL; |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 231 | int i; |
| 232 | size_t count = 0; |
| 233 | int retval; |
| 234 | |
| 235 | /* search the kset, the device belongs to */ |
| 236 | top_kobj = &dev->kobj; |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 237 | while (!top_kobj->kset && top_kobj->parent) |
| 238 | top_kobj = top_kobj->parent; |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 239 | if (!top_kobj->kset) |
| 240 | goto out; |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 241 | |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 242 | kset = top_kobj->kset; |
| 243 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) |
| 244 | goto out; |
| 245 | |
| 246 | /* respect filter */ |
| 247 | if (kset->uevent_ops && kset->uevent_ops->filter) |
| 248 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) |
| 249 | goto out; |
| 250 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 251 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
| 252 | if (!env) |
Greg Kroah-Hartman | c7308c8 | 2007-05-02 14:14:11 +0200 | [diff] [blame] | 253 | return -ENOMEM; |
| 254 | |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 255 | /* let the kset specific function add its keys */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 256 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 257 | if (retval) |
| 258 | goto out; |
| 259 | |
| 260 | /* copy keys to file */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 261 | for (i = 0; i < env->envp_idx; i++) |
| 262 | count += sprintf(&buf[count], "%s\n", env->envp[i]); |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 263 | out: |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 264 | kfree(env); |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 265 | return count; |
| 266 | } |
| 267 | |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 268 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
| 269 | const char *buf, size_t count) |
| 270 | { |
Kay Sievers | 60a96a5 | 2007-07-08 22:29:26 +0200 | [diff] [blame] | 271 | enum kobject_action action; |
| 272 | |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 273 | if (kobject_action_type(buf, count, &action) == 0) { |
Kay Sievers | 60a96a5 | 2007-07-08 22:29:26 +0200 | [diff] [blame] | 274 | kobject_uevent(&dev->kobj, action); |
| 275 | goto out; |
| 276 | } |
| 277 | |
| 278 | dev_err(dev, "uevent: unsupported action-string; this will " |
| 279 | "be ignored in a future kernel version\n"); |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 280 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
Kay Sievers | 60a96a5 | 2007-07-08 22:29:26 +0200 | [diff] [blame] | 281 | out: |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 282 | return count; |
| 283 | } |
| 284 | |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 285 | static struct device_attribute uevent_attr = |
| 286 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); |
| 287 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 288 | static int device_add_attributes(struct device *dev, |
| 289 | struct device_attribute *attrs) |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 290 | { |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 291 | int error = 0; |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 292 | int i; |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 293 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 294 | if (attrs) { |
| 295 | for (i = 0; attr_name(attrs[i]); i++) { |
| 296 | error = device_create_file(dev, &attrs[i]); |
| 297 | if (error) |
| 298 | break; |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 299 | } |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 300 | if (error) |
| 301 | while (--i >= 0) |
| 302 | device_remove_file(dev, &attrs[i]); |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 303 | } |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 304 | return error; |
| 305 | } |
| 306 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 307 | static void device_remove_attributes(struct device *dev, |
| 308 | struct device_attribute *attrs) |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 309 | { |
| 310 | int i; |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 311 | |
| 312 | if (attrs) |
| 313 | for (i = 0; attr_name(attrs[i]); i++) |
| 314 | device_remove_file(dev, &attrs[i]); |
| 315 | } |
| 316 | |
| 317 | static int device_add_groups(struct device *dev, |
| 318 | struct attribute_group **groups) |
| 319 | { |
| 320 | int error = 0; |
| 321 | int i; |
| 322 | |
| 323 | if (groups) { |
| 324 | for (i = 0; groups[i]; i++) { |
| 325 | error = sysfs_create_group(&dev->kobj, groups[i]); |
| 326 | if (error) { |
| 327 | while (--i >= 0) |
| 328 | sysfs_remove_group(&dev->kobj, groups[i]); |
| 329 | break; |
| 330 | } |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 331 | } |
| 332 | } |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 333 | return error; |
| 334 | } |
| 335 | |
| 336 | static void device_remove_groups(struct device *dev, |
| 337 | struct attribute_group **groups) |
| 338 | { |
| 339 | int i; |
| 340 | |
| 341 | if (groups) |
| 342 | for (i = 0; groups[i]; i++) |
| 343 | sysfs_remove_group(&dev->kobj, groups[i]); |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 344 | } |
| 345 | |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 346 | static int device_add_attrs(struct device *dev) |
| 347 | { |
| 348 | struct class *class = dev->class; |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 349 | struct device_type *type = dev->type; |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 350 | int error; |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 351 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 352 | if (class) { |
| 353 | error = device_add_attributes(dev, class->dev_attrs); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 354 | if (error) |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 355 | return error; |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 356 | } |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 357 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 358 | if (type) { |
| 359 | error = device_add_groups(dev, type->groups); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 360 | if (error) |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 361 | goto err_remove_class_attrs; |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 362 | } |
| 363 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 364 | error = device_add_groups(dev, dev->groups); |
| 365 | if (error) |
| 366 | goto err_remove_type_groups; |
| 367 | |
| 368 | return 0; |
| 369 | |
| 370 | err_remove_type_groups: |
| 371 | if (type) |
| 372 | device_remove_groups(dev, type->groups); |
| 373 | err_remove_class_attrs: |
| 374 | if (class) |
| 375 | device_remove_attributes(dev, class->dev_attrs); |
| 376 | |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 377 | return error; |
| 378 | } |
| 379 | |
| 380 | static void device_remove_attrs(struct device *dev) |
| 381 | { |
| 382 | struct class *class = dev->class; |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 383 | struct device_type *type = dev->type; |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 384 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 385 | device_remove_groups(dev, dev->groups); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 386 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 387 | if (type) |
| 388 | device_remove_groups(dev, type->groups); |
| 389 | |
| 390 | if (class) |
| 391 | device_remove_attributes(dev, class->dev_attrs); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 395 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
| 396 | char *buf) |
| 397 | { |
| 398 | return print_dev_t(buf, dev->devt); |
| 399 | } |
| 400 | |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 401 | static struct device_attribute devt_attr = |
| 402 | __ATTR(dev, S_IRUGO, show_dev, NULL); |
| 403 | |
Greg Kroah-Hartman | 881c6cfd | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 404 | /* kset to create /sys/devices/ */ |
| 405 | struct kset *devices_kset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
| 407 | |
| 408 | /** |
| 409 | * device_create_file - create sysfs attribute file for device. |
| 410 | * @dev: device. |
| 411 | * @attr: device attribute descriptor. |
| 412 | */ |
| 413 | |
| 414 | int device_create_file(struct device * dev, struct device_attribute * attr) |
| 415 | { |
| 416 | int error = 0; |
| 417 | if (get_device(dev)) { |
| 418 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
| 419 | put_device(dev); |
| 420 | } |
| 421 | return error; |
| 422 | } |
| 423 | |
| 424 | /** |
| 425 | * device_remove_file - remove sysfs attribute file. |
| 426 | * @dev: device. |
| 427 | * @attr: device attribute descriptor. |
| 428 | */ |
| 429 | |
| 430 | void device_remove_file(struct device * dev, struct device_attribute * attr) |
| 431 | { |
| 432 | if (get_device(dev)) { |
| 433 | sysfs_remove_file(&dev->kobj, &attr->attr); |
| 434 | put_device(dev); |
| 435 | } |
| 436 | } |
| 437 | |
Greg Kroah-Hartman | 2589f188 | 2006-09-19 09:39:19 -0700 | [diff] [blame] | 438 | /** |
| 439 | * device_create_bin_file - create sysfs binary attribute file for device. |
| 440 | * @dev: device. |
| 441 | * @attr: device binary attribute descriptor. |
| 442 | */ |
| 443 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) |
| 444 | { |
| 445 | int error = -EINVAL; |
| 446 | if (dev) |
| 447 | error = sysfs_create_bin_file(&dev->kobj, attr); |
| 448 | return error; |
| 449 | } |
| 450 | EXPORT_SYMBOL_GPL(device_create_bin_file); |
| 451 | |
| 452 | /** |
| 453 | * device_remove_bin_file - remove sysfs binary attribute file |
| 454 | * @dev: device. |
| 455 | * @attr: device binary attribute descriptor. |
| 456 | */ |
| 457 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) |
| 458 | { |
| 459 | if (dev) |
| 460 | sysfs_remove_bin_file(&dev->kobj, attr); |
| 461 | } |
| 462 | EXPORT_SYMBOL_GPL(device_remove_bin_file); |
| 463 | |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 464 | /** |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 465 | * device_schedule_callback_owner - helper to schedule a callback for a device |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 466 | * @dev: device. |
| 467 | * @func: callback function to invoke later. |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 468 | * @owner: module owning the callback routine |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 469 | * |
| 470 | * Attribute methods must not unregister themselves or their parent device |
| 471 | * (which would amount to the same thing). Attempts to do so will deadlock, |
| 472 | * since unregistration is mutually exclusive with driver callbacks. |
| 473 | * |
| 474 | * Instead methods can call this routine, which will attempt to allocate |
| 475 | * and schedule a workqueue request to call back @func with @dev as its |
| 476 | * argument in the workqueue's process context. @dev will be pinned until |
| 477 | * @func returns. |
| 478 | * |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 479 | * This routine is usually called via the inline device_schedule_callback(), |
| 480 | * which automatically sets @owner to THIS_MODULE. |
| 481 | * |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 482 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 483 | * be allocated, -ENODEV if a reference to @owner isn't available. |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 484 | * |
| 485 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an |
| 486 | * underlying sysfs routine (since it is intended for use by attribute |
| 487 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. |
| 488 | */ |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 489 | int device_schedule_callback_owner(struct device *dev, |
| 490 | void (*func)(struct device *), struct module *owner) |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 491 | { |
| 492 | return sysfs_schedule_callback(&dev->kobj, |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 493 | (void (*)(void *)) func, dev, owner); |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 494 | } |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 495 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 496 | |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 497 | static void klist_children_get(struct klist_node *n) |
| 498 | { |
| 499 | struct device *dev = container_of(n, struct device, knode_parent); |
| 500 | |
| 501 | get_device(dev); |
| 502 | } |
| 503 | |
| 504 | static void klist_children_put(struct klist_node *n) |
| 505 | { |
| 506 | struct device *dev = container_of(n, struct device, knode_parent); |
| 507 | |
| 508 | put_device(dev); |
| 509 | } |
| 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | |
| 512 | /** |
| 513 | * device_initialize - init device structure. |
| 514 | * @dev: device. |
| 515 | * |
| 516 | * This prepares the device for use by other layers, |
| 517 | * including adding it to the device hierarchy. |
| 518 | * It is the first half of device_register(), if called by |
| 519 | * that, though it can also be called separately, so one |
| 520 | * may use @dev's fields (e.g. the refcount). |
| 521 | */ |
| 522 | |
| 523 | void device_initialize(struct device *dev) |
| 524 | { |
Greg Kroah-Hartman | 881c6cfd | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 525 | dev->kobj.kset = devices_kset; |
Greg Kroah-Hartman | 9990513 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 526 | kobject_init_ng(&dev->kobj, &device_ktype); |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 527 | klist_init(&dev->klist_children, klist_children_get, |
| 528 | klist_children_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | INIT_LIST_HEAD(&dev->dma_pools); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 530 | INIT_LIST_HEAD(&dev->node); |
mochel@digitalimplant.org | af70316 | 2005-03-21 10:41:04 -0800 | [diff] [blame] | 531 | init_MUTEX(&dev->sem); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 532 | spin_lock_init(&dev->devres_lock); |
| 533 | INIT_LIST_HEAD(&dev->devres_head); |
David Brownell | 0ac8524 | 2005-09-12 19:39:34 -0700 | [diff] [blame] | 534 | device_init_wakeup(dev, 0); |
Christoph Hellwig | 8734813 | 2006-12-06 20:32:33 -0800 | [diff] [blame] | 535 | set_dev_node(dev, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | } |
| 537 | |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 538 | #ifdef CONFIG_SYSFS_DEPRECATED |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 539 | static struct kobject * get_device_parent(struct device *dev, |
| 540 | struct device *parent) |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 541 | { |
Dmitry Torokhov | 3eb215d | 2007-10-07 12:22:21 -0400 | [diff] [blame] | 542 | /* |
| 543 | * Set the parent to the class, not the parent device |
| 544 | * for topmost devices in class hierarchy. |
| 545 | * This keeps sysfs from having a symlink to make old |
| 546 | * udevs happy |
| 547 | */ |
| 548 | if (dev->class && (!parent || parent->class != dev->class)) |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 549 | return &dev->class->subsys.kobj; |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 550 | else if (parent) |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 551 | return &parent->kobj; |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 552 | |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 553 | return NULL; |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 554 | } |
| 555 | #else |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 556 | static struct kobject *virtual_device_parent(struct device *dev) |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 557 | { |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 558 | static struct kobject *virtual_dir = NULL; |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 559 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 560 | if (!virtual_dir) |
Greg Kroah-Hartman | 4ff6abf | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 561 | virtual_dir = kobject_create_and_add("virtual", |
Greg Kroah-Hartman | 881c6cfd | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 562 | &devices_kset->kobj); |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 563 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 564 | return virtual_dir; |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 565 | } |
| 566 | |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 567 | static struct kobject * get_device_parent(struct device *dev, |
| 568 | struct device *parent) |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 569 | { |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 570 | int retval; |
| 571 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 572 | if (dev->class) { |
| 573 | struct kobject *kobj = NULL; |
| 574 | struct kobject *parent_kobj; |
| 575 | struct kobject *k; |
| 576 | |
| 577 | /* |
| 578 | * If we have no parent, we live in "virtual". |
| 579 | * Class-devices with a bus-device as parent, live |
| 580 | * in a class-directory to prevent namespace collisions. |
| 581 | */ |
| 582 | if (parent == NULL) |
| 583 | parent_kobj = virtual_device_parent(dev); |
| 584 | else if (parent->class) |
| 585 | return &parent->kobj; |
| 586 | else |
| 587 | parent_kobj = &parent->kobj; |
| 588 | |
| 589 | /* find our class-directory at the parent and reference it */ |
| 590 | spin_lock(&dev->class->class_dirs.list_lock); |
| 591 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) |
| 592 | if (k->parent == parent_kobj) { |
| 593 | kobj = kobject_get(k); |
| 594 | break; |
| 595 | } |
| 596 | spin_unlock(&dev->class->class_dirs.list_lock); |
| 597 | if (kobj) |
| 598 | return kobj; |
| 599 | |
| 600 | /* or create a new class-directory at the parent device */ |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 601 | k = kobject_create(); |
| 602 | if (!k) |
| 603 | return NULL; |
| 604 | k->kset = &dev->class->class_dirs; |
| 605 | retval = kobject_add_ng(k, parent_kobj, "%s", dev->class->name); |
| 606 | if (retval < 0) { |
| 607 | kobject_put(k); |
| 608 | return NULL; |
| 609 | } |
| 610 | /* Do not emit a uevent, as it's not needed for this |
| 611 | * "class glue" directory. */ |
| 612 | return k; |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 613 | } |
| 614 | |
| 615 | if (parent) |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 616 | return &parent->kobj; |
| 617 | return NULL; |
| 618 | } |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 619 | #endif |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 620 | |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 621 | static int setup_parent(struct device *dev, struct device *parent) |
| 622 | { |
| 623 | struct kobject *kobj; |
| 624 | kobj = get_device_parent(dev, parent); |
| 625 | if (IS_ERR(kobj)) |
| 626 | return PTR_ERR(kobj); |
| 627 | if (kobj) |
| 628 | dev->kobj.parent = kobj; |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 629 | return 0; |
| 630 | } |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 631 | |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 632 | static int device_add_class_symlinks(struct device *dev) |
| 633 | { |
| 634 | int error; |
| 635 | |
| 636 | if (!dev->class) |
| 637 | return 0; |
| 638 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, |
| 639 | "subsystem"); |
| 640 | if (error) |
| 641 | goto out; |
| 642 | /* |
| 643 | * If this is not a "fake" compatible device, then create the |
| 644 | * symlink from the class to the device. |
| 645 | */ |
| 646 | if (dev->kobj.parent != &dev->class->subsys.kobj) { |
| 647 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
| 648 | dev->bus_id); |
| 649 | if (error) |
| 650 | goto out_subsys; |
| 651 | } |
Cornelia Huck | 2790768 | 2007-07-25 09:58:08 +0200 | [diff] [blame] | 652 | if (dev->parent) { |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 653 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 654 | { |
Dmitry Torokhov | 4f01a75 | 2007-09-18 22:46:50 -0700 | [diff] [blame] | 655 | struct device *parent = dev->parent; |
| 656 | char *class_name; |
| 657 | |
| 658 | /* |
| 659 | * In old sysfs stacked class devices had 'device' |
| 660 | * link pointing to real device instead of parent |
| 661 | */ |
| 662 | while (parent->class && !parent->bus && parent->parent) |
| 663 | parent = parent->parent; |
| 664 | |
| 665 | error = sysfs_create_link(&dev->kobj, |
| 666 | &parent->kobj, |
| 667 | "device"); |
| 668 | if (error) |
| 669 | goto out_busid; |
| 670 | |
| 671 | class_name = make_class_name(dev->class->name, |
| 672 | &dev->kobj); |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 673 | if (class_name) |
| 674 | error = sysfs_create_link(&dev->parent->kobj, |
| 675 | &dev->kobj, class_name); |
| 676 | kfree(class_name); |
| 677 | if (error) |
| 678 | goto out_device; |
| 679 | } |
Dmitry Torokhov | 4f01a75 | 2007-09-18 22:46:50 -0700 | [diff] [blame] | 680 | #else |
| 681 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
| 682 | "device"); |
| 683 | if (error) |
| 684 | goto out_busid; |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 685 | #endif |
| 686 | } |
| 687 | return 0; |
| 688 | |
| 689 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 690 | out_device: |
| 691 | if (dev->parent) |
| 692 | sysfs_remove_link(&dev->kobj, "device"); |
| 693 | #endif |
| 694 | out_busid: |
| 695 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
| 696 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
| 697 | out_subsys: |
| 698 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 699 | out: |
| 700 | return error; |
| 701 | } |
| 702 | |
| 703 | static void device_remove_class_symlinks(struct device *dev) |
| 704 | { |
| 705 | if (!dev->class) |
| 706 | return; |
| 707 | if (dev->parent) { |
| 708 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 709 | char *class_name; |
| 710 | |
| 711 | class_name = make_class_name(dev->class->name, &dev->kobj); |
| 712 | if (class_name) { |
| 713 | sysfs_remove_link(&dev->parent->kobj, class_name); |
| 714 | kfree(class_name); |
| 715 | } |
| 716 | #endif |
| 717 | sysfs_remove_link(&dev->kobj, "device"); |
| 718 | } |
| 719 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
| 720 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
| 721 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 722 | } |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | /** |
| 725 | * device_add - add device to device hierarchy. |
| 726 | * @dev: device. |
| 727 | * |
| 728 | * This is part 2 of device_register(), though may be called |
| 729 | * separately _iff_ device_initialize() has been called separately. |
| 730 | * |
Greg Kroah-Hartman | 9990513 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 731 | * This adds it to the kobject hierarchy via kobject_add_ng(), adds it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | * to the global and sibling lists for the device, then |
| 733 | * adds it to the other relevant subsystems of the driver model. |
| 734 | */ |
| 735 | int device_add(struct device *dev) |
| 736 | { |
| 737 | struct device *parent = NULL; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 738 | struct class_interface *class_intf; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 739 | int error; |
| 740 | |
| 741 | error = pm_sleep_lock(); |
| 742 | if (error) { |
| 743 | dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__); |
| 744 | dump_stack(); |
| 745 | return error; |
| 746 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
| 748 | dev = get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 749 | if (!dev || !strlen(dev->bus_id)) { |
| 750 | error = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | goto Error; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 752 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 754 | pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); |
Greg Kroah-Hartman | c205ef4 | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 755 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | parent = get_device(dev->parent); |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 757 | error = setup_parent(dev, parent); |
| 758 | if (error) |
| 759 | goto Error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | /* first, register with generic layer. */ |
Greg Kroah-Hartman | 9990513 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 762 | error = kobject_add_ng(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 763 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | goto Error; |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 765 | |
Brian Walsh | 3702264 | 2006-08-14 22:43:19 -0700 | [diff] [blame] | 766 | /* notify platform of device entry */ |
| 767 | if (platform_notify) |
| 768 | platform_notify(dev); |
| 769 | |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 770 | /* notify clients of device entry (new way) */ |
| 771 | if (dev->bus) |
| 772 | blocking_notifier_call_chain(&dev->bus->bus_notifier, |
| 773 | BUS_NOTIFY_ADD_DEVICE, dev); |
| 774 | |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 775 | error = device_create_file(dev, &uevent_attr); |
Cornelia Huck | a306eea | 2006-09-22 11:37:13 +0200 | [diff] [blame] | 776 | if (error) |
| 777 | goto attrError; |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 778 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 779 | if (MAJOR(dev->devt)) { |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 780 | error = device_create_file(dev, &devt_attr); |
| 781 | if (error) |
Cornelia Huck | a306eea | 2006-09-22 11:37:13 +0200 | [diff] [blame] | 782 | goto ueventattrError; |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 783 | } |
| 784 | |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 785 | error = device_add_class_symlinks(dev); |
| 786 | if (error) |
| 787 | goto SymlinkError; |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 788 | error = device_add_attrs(dev); |
| 789 | if (error) |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 790 | goto AttrsError; |
Daniel Drake | dec13c1 | 2007-11-21 14:55:18 -0800 | [diff] [blame] | 791 | error = dpm_sysfs_add(dev); |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 792 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | goto PMError; |
Daniel Drake | dec13c1 | 2007-11-21 14:55:18 -0800 | [diff] [blame] | 794 | device_pm_add(dev); |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 795 | error = bus_add_device(dev); |
| 796 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | goto BusError; |
Cornelia Huck | 83b5fb4c | 2007-03-29 11:12:11 +0200 | [diff] [blame] | 798 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
Cornelia Huck | c6a4669 | 2007-02-05 16:15:26 -0800 | [diff] [blame] | 799 | bus_attach_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | if (parent) |
James Bottomley | d856f1e3 | 2005-08-19 09:14:01 -0400 | [diff] [blame] | 801 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 803 | if (dev->class) { |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 804 | down(&dev->class->sem); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 805 | /* tie the class to the device */ |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 806 | list_add_tail(&dev->node, &dev->class->devices); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 807 | |
| 808 | /* notify any interfaces that the device is here */ |
| 809 | list_for_each_entry(class_intf, &dev->class->interfaces, node) |
| 810 | if (class_intf->add_dev) |
| 811 | class_intf->add_dev(dev, class_intf); |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 812 | up(&dev->class->sem); |
| 813 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | Done: |
| 815 | put_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 816 | pm_sleep_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | return error; |
| 818 | BusError: |
| 819 | device_pm_remove(dev); |
Daniel Drake | dec13c1 | 2007-11-21 14:55:18 -0800 | [diff] [blame] | 820 | dpm_sysfs_remove(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | PMError: |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 822 | if (dev->bus) |
| 823 | blocking_notifier_call_chain(&dev->bus->bus_notifier, |
| 824 | BUS_NOTIFY_DEL_DEVICE, dev); |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 825 | device_remove_attrs(dev); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 826 | AttrsError: |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 827 | device_remove_class_symlinks(dev); |
| 828 | SymlinkError: |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 829 | if (MAJOR(dev->devt)) |
| 830 | device_remove_file(dev, &devt_attr); |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 831 | |
| 832 | if (dev->class) { |
| 833 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 834 | /* If this is not a "fake" compatible device, remove the |
| 835 | * symlink from the class to the device. */ |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 836 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
| 837 | sysfs_remove_link(&dev->class->subsys.kobj, |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 838 | dev->bus_id); |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 839 | if (parent) { |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 840 | #ifdef CONFIG_SYSFS_DEPRECATED |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 841 | char *class_name = make_class_name(dev->class->name, |
| 842 | &dev->kobj); |
| 843 | if (class_name) |
| 844 | sysfs_remove_link(&dev->parent->kobj, |
| 845 | class_name); |
| 846 | kfree(class_name); |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 847 | #endif |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 848 | sysfs_remove_link(&dev->kobj, "device"); |
| 849 | } |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 850 | } |
Cornelia Huck | a306eea | 2006-09-22 11:37:13 +0200 | [diff] [blame] | 851 | ueventattrError: |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 852 | device_remove_file(dev, &uevent_attr); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 853 | attrError: |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 854 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | kobject_del(&dev->kobj); |
| 856 | Error: |
| 857 | if (parent) |
| 858 | put_device(parent); |
| 859 | goto Done; |
| 860 | } |
| 861 | |
| 862 | |
| 863 | /** |
| 864 | * device_register - register a device with the system. |
| 865 | * @dev: pointer to the device structure |
| 866 | * |
| 867 | * This happens in two clean steps - initialize the device |
| 868 | * and add it to the system. The two steps can be called |
| 869 | * separately, but this is the easiest and most common. |
| 870 | * I.e. you should only call the two helpers separately if |
| 871 | * have a clearly defined need to use and refcount the device |
| 872 | * before it is added to the hierarchy. |
| 873 | */ |
| 874 | |
| 875 | int device_register(struct device *dev) |
| 876 | { |
| 877 | device_initialize(dev); |
| 878 | return device_add(dev); |
| 879 | } |
| 880 | |
| 881 | |
| 882 | /** |
| 883 | * get_device - increment reference count for device. |
| 884 | * @dev: device. |
| 885 | * |
| 886 | * This simply forwards the call to kobject_get(), though |
| 887 | * we do take care to provide for the case that we get a NULL |
| 888 | * pointer passed in. |
| 889 | */ |
| 890 | |
| 891 | struct device * get_device(struct device * dev) |
| 892 | { |
| 893 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; |
| 894 | } |
| 895 | |
| 896 | |
| 897 | /** |
| 898 | * put_device - decrement reference count. |
| 899 | * @dev: device in question. |
| 900 | */ |
| 901 | void put_device(struct device * dev) |
| 902 | { |
| 903 | if (dev) |
| 904 | kobject_put(&dev->kobj); |
| 905 | } |
| 906 | |
| 907 | |
| 908 | /** |
| 909 | * device_del - delete device from system. |
| 910 | * @dev: device. |
| 911 | * |
| 912 | * This is the first part of the device unregistration |
| 913 | * sequence. This removes the device from the lists we control |
| 914 | * from here, has it removed from the other driver model |
| 915 | * subsystems it was added to in device_add(), and removes it |
| 916 | * from the kobject hierarchy. |
| 917 | * |
| 918 | * NOTE: this should be called manually _iff_ device_add() was |
| 919 | * also called manually. |
| 920 | */ |
| 921 | |
| 922 | void device_del(struct device * dev) |
| 923 | { |
| 924 | struct device * parent = dev->parent; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 925 | struct class_interface *class_intf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 927 | device_pm_remove(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | if (parent) |
Patrick Mochel | d62c0f9 | 2005-06-24 08:39:33 -0700 | [diff] [blame] | 929 | klist_del(&dev->knode_parent); |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 930 | if (MAJOR(dev->devt)) |
| 931 | device_remove_file(dev, &devt_attr); |
Kay Sievers | b9d9c82 | 2006-06-15 15:31:56 +0200 | [diff] [blame] | 932 | if (dev->class) { |
| 933 | sysfs_remove_link(&dev->kobj, "subsystem"); |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 934 | /* If this is not a "fake" compatible device, remove the |
| 935 | * symlink from the class to the device. */ |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 936 | if (dev->kobj.parent != &dev->class->subsys.kobj) |
| 937 | sysfs_remove_link(&dev->class->subsys.kobj, |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 938 | dev->bus_id); |
Greg Kroah-Hartman | 64bb5d2 | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 939 | if (parent) { |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 940 | #ifdef CONFIG_SYSFS_DEPRECATED |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 941 | char *class_name = make_class_name(dev->class->name, |
| 942 | &dev->kobj); |
Cornelia Huck | cb360bb | 2006-11-27 10:35:05 +0100 | [diff] [blame] | 943 | if (class_name) |
| 944 | sysfs_remove_link(&dev->parent->kobj, |
| 945 | class_name); |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 946 | kfree(class_name); |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 947 | #endif |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 948 | sysfs_remove_link(&dev->kobj, "device"); |
Greg Kroah-Hartman | 64bb5d2 | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 949 | } |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 950 | |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 951 | down(&dev->class->sem); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 952 | /* notify any interfaces that the device is now gone */ |
| 953 | list_for_each_entry(class_intf, &dev->class->interfaces, node) |
| 954 | if (class_intf->remove_dev) |
| 955 | class_intf->remove_dev(dev, class_intf); |
| 956 | /* remove the device from the class list */ |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 957 | list_del_init(&dev->node); |
| 958 | up(&dev->class->sem); |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 959 | |
| 960 | /* If we live in a parent class-directory, unreference it */ |
| 961 | if (dev->kobj.parent->kset == &dev->class->class_dirs) { |
| 962 | struct device *d; |
| 963 | int other = 0; |
| 964 | |
| 965 | /* |
| 966 | * if we are the last child of our class, delete |
| 967 | * our class-directory at this parent |
| 968 | */ |
| 969 | down(&dev->class->sem); |
| 970 | list_for_each_entry(d, &dev->class->devices, node) { |
| 971 | if (d == dev) |
| 972 | continue; |
| 973 | if (d->kobj.parent == dev->kobj.parent) { |
| 974 | other = 1; |
| 975 | break; |
| 976 | } |
| 977 | } |
| 978 | if (!other) |
| 979 | kobject_del(dev->kobj.parent); |
| 980 | |
| 981 | kobject_put(dev->kobj.parent); |
| 982 | up(&dev->class->sem); |
| 983 | } |
Kay Sievers | b9d9c82 | 2006-06-15 15:31:56 +0200 | [diff] [blame] | 984 | } |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 985 | device_remove_file(dev, &uevent_attr); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 986 | device_remove_attrs(dev); |
Benjamin Herrenschmidt | 2895353 | 2006-11-08 19:46:14 -0800 | [diff] [blame] | 987 | bus_remove_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | |
Tejun Heo | 2f8d16a | 2007-03-09 19:34:19 +0900 | [diff] [blame] | 989 | /* |
| 990 | * Some platform devices are driven without driver attached |
| 991 | * and managed resources may have been acquired. Make sure |
| 992 | * all resources are released. |
| 993 | */ |
| 994 | devres_release_all(dev); |
| 995 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | /* Notify the platform of the removal, in case they |
| 997 | * need to do anything... |
| 998 | */ |
| 999 | if (platform_notify_remove) |
| 1000 | platform_notify_remove(dev); |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 1001 | if (dev->bus) |
| 1002 | blocking_notifier_call_chain(&dev->bus->bus_notifier, |
| 1003 | BUS_NOTIFY_DEL_DEVICE, dev); |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 1004 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | kobject_del(&dev->kobj); |
| 1006 | if (parent) |
| 1007 | put_device(parent); |
| 1008 | } |
| 1009 | |
| 1010 | /** |
| 1011 | * device_unregister - unregister device from system. |
| 1012 | * @dev: device going away. |
| 1013 | * |
| 1014 | * We do this in two parts, like we do device_register(). First, |
| 1015 | * we remove it from all the subsystems with device_del(), then |
| 1016 | * we decrement the reference count via put_device(). If that |
| 1017 | * is the final reference count, the device will be cleaned up |
| 1018 | * via device_release() above. Otherwise, the structure will |
| 1019 | * stick around until the final reference to the device is dropped. |
| 1020 | */ |
| 1021 | void device_unregister(struct device * dev) |
| 1022 | { |
| 1023 | pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); |
| 1024 | device_del(dev); |
| 1025 | put_device(dev); |
| 1026 | } |
| 1027 | |
| 1028 | |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 1029 | static struct device * next_device(struct klist_iter * i) |
| 1030 | { |
| 1031 | struct klist_node * n = klist_next(i); |
| 1032 | return n ? container_of(n, struct device, knode_parent) : NULL; |
| 1033 | } |
| 1034 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | /** |
| 1036 | * device_for_each_child - device child iterator. |
Randy Dunlap | c41455f | 2005-10-23 11:59:14 -0700 | [diff] [blame] | 1037 | * @parent: parent struct device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | * @data: data for the callback. |
| 1039 | * @fn: function to be called for each device. |
| 1040 | * |
Randy Dunlap | c41455f | 2005-10-23 11:59:14 -0700 | [diff] [blame] | 1041 | * Iterate over @parent's child devices, and call @fn for each, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | * passing it @data. |
| 1043 | * |
| 1044 | * We check the return of @fn each time. If it returns anything |
| 1045 | * other than 0, we break out and return that value. |
| 1046 | */ |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 1047 | int device_for_each_child(struct device * parent, void * data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | int (*fn)(struct device *, void *)) |
| 1049 | { |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 1050 | struct klist_iter i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | struct device * child; |
| 1052 | int error = 0; |
| 1053 | |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 1054 | klist_iter_init(&parent->klist_children, &i); |
| 1055 | while ((child = next_device(&i)) && !error) |
| 1056 | error = fn(child, data); |
| 1057 | klist_iter_exit(&i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | return error; |
| 1059 | } |
| 1060 | |
Cornelia Huck | 5ab6998 | 2006-11-16 15:42:07 +0100 | [diff] [blame] | 1061 | /** |
| 1062 | * device_find_child - device iterator for locating a particular device. |
| 1063 | * @parent: parent struct device |
| 1064 | * @data: Data to pass to match function |
| 1065 | * @match: Callback function to check device |
| 1066 | * |
| 1067 | * This is similar to the device_for_each_child() function above, but it |
| 1068 | * returns a reference to a device that is 'found' for later use, as |
| 1069 | * determined by the @match callback. |
| 1070 | * |
| 1071 | * The callback should return 0 if the device doesn't match and non-zero |
| 1072 | * if it does. If the callback returns non-zero and a reference to the |
| 1073 | * current device can be obtained, this function will return to the caller |
| 1074 | * and not iterate over any more devices. |
| 1075 | */ |
| 1076 | struct device * device_find_child(struct device *parent, void *data, |
| 1077 | int (*match)(struct device *, void *)) |
| 1078 | { |
| 1079 | struct klist_iter i; |
| 1080 | struct device *child; |
| 1081 | |
| 1082 | if (!parent) |
| 1083 | return NULL; |
| 1084 | |
| 1085 | klist_iter_init(&parent->klist_children, &i); |
| 1086 | while ((child = next_device(&i))) |
| 1087 | if (match(child, data) && get_device(child)) |
| 1088 | break; |
| 1089 | klist_iter_exit(&i); |
| 1090 | return child; |
| 1091 | } |
| 1092 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | int __init devices_init(void) |
| 1094 | { |
Greg Kroah-Hartman | 881c6cfd | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 1095 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
| 1096 | if (!devices_kset) |
| 1097 | return -ENOMEM; |
| 1098 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | } |
| 1100 | |
| 1101 | EXPORT_SYMBOL_GPL(device_for_each_child); |
Cornelia Huck | 5ab6998 | 2006-11-16 15:42:07 +0100 | [diff] [blame] | 1102 | EXPORT_SYMBOL_GPL(device_find_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | |
| 1104 | EXPORT_SYMBOL_GPL(device_initialize); |
| 1105 | EXPORT_SYMBOL_GPL(device_add); |
| 1106 | EXPORT_SYMBOL_GPL(device_register); |
| 1107 | |
| 1108 | EXPORT_SYMBOL_GPL(device_del); |
| 1109 | EXPORT_SYMBOL_GPL(device_unregister); |
| 1110 | EXPORT_SYMBOL_GPL(get_device); |
| 1111 | EXPORT_SYMBOL_GPL(put_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | |
| 1113 | EXPORT_SYMBOL_GPL(device_create_file); |
| 1114 | EXPORT_SYMBOL_GPL(device_remove_file); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1115 | |
| 1116 | |
| 1117 | static void device_create_release(struct device *dev) |
| 1118 | { |
| 1119 | pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); |
| 1120 | kfree(dev); |
| 1121 | } |
| 1122 | |
| 1123 | /** |
| 1124 | * device_create - creates a device and registers it with sysfs |
Henrik Kretzschmar | 42734da | 2006-07-05 00:53:19 +0200 | [diff] [blame] | 1125 | * @class: pointer to the struct class that this device should be registered to |
| 1126 | * @parent: pointer to the parent struct device of this new device, if any |
| 1127 | * @devt: the dev_t for the char device to be added |
| 1128 | * @fmt: string for the device's name |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1129 | * |
Henrik Kretzschmar | 42734da | 2006-07-05 00:53:19 +0200 | [diff] [blame] | 1130 | * This function can be used by char device classes. A struct device |
| 1131 | * will be created in sysfs, registered to the specified class. |
| 1132 | * |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1133 | * A "dev" file will be created, showing the dev_t for the device, if |
| 1134 | * the dev_t is not 0,0. |
Henrik Kretzschmar | 42734da | 2006-07-05 00:53:19 +0200 | [diff] [blame] | 1135 | * If a pointer to a parent struct device is passed in, the newly created |
| 1136 | * struct device will be a child of that device in sysfs. |
| 1137 | * The pointer to the struct device will be returned from the call. |
| 1138 | * Any further sysfs files that might be required can be created using this |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1139 | * pointer. |
| 1140 | * |
| 1141 | * Note: the struct class passed to this function must have previously |
| 1142 | * been created with a call to class_create(). |
| 1143 | */ |
| 1144 | struct device *device_create(struct class *class, struct device *parent, |
Greg Kroah-Hartman | 5cbe5f8 | 2006-08-10 01:19:19 -0400 | [diff] [blame] | 1145 | dev_t devt, const char *fmt, ...) |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1146 | { |
| 1147 | va_list args; |
| 1148 | struct device *dev = NULL; |
| 1149 | int retval = -ENODEV; |
| 1150 | |
| 1151 | if (class == NULL || IS_ERR(class)) |
| 1152 | goto error; |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1153 | |
| 1154 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 1155 | if (!dev) { |
| 1156 | retval = -ENOMEM; |
| 1157 | goto error; |
| 1158 | } |
| 1159 | |
| 1160 | dev->devt = devt; |
| 1161 | dev->class = class; |
| 1162 | dev->parent = parent; |
| 1163 | dev->release = device_create_release; |
| 1164 | |
| 1165 | va_start(args, fmt); |
| 1166 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); |
| 1167 | va_end(args); |
| 1168 | retval = device_register(dev); |
| 1169 | if (retval) |
| 1170 | goto error; |
| 1171 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1172 | return dev; |
| 1173 | |
| 1174 | error: |
| 1175 | kfree(dev); |
| 1176 | return ERR_PTR(retval); |
| 1177 | } |
| 1178 | EXPORT_SYMBOL_GPL(device_create); |
| 1179 | |
| 1180 | /** |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1181 | * find_device - finds a device that was created with device_create() |
Henrik Kretzschmar | 42734da | 2006-07-05 00:53:19 +0200 | [diff] [blame] | 1182 | * @class: pointer to the struct class that this device was registered with |
| 1183 | * @devt: the dev_t of the device that was previously registered |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1184 | */ |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1185 | static struct device *find_device(struct class *class, dev_t devt) |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1186 | { |
| 1187 | struct device *dev = NULL; |
| 1188 | struct device *dev_tmp; |
| 1189 | |
| 1190 | down(&class->sem); |
| 1191 | list_for_each_entry(dev_tmp, &class->devices, node) { |
| 1192 | if (dev_tmp->devt == devt) { |
| 1193 | dev = dev_tmp; |
| 1194 | break; |
| 1195 | } |
| 1196 | } |
| 1197 | up(&class->sem); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1198 | return dev; |
| 1199 | } |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1200 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1201 | /** |
| 1202 | * device_destroy - removes a device that was created with device_create() |
| 1203 | * @class: pointer to the struct class that this device was registered with |
| 1204 | * @devt: the dev_t of the device that was previously registered |
| 1205 | * |
| 1206 | * This call unregisters and cleans up a device that was created with a |
| 1207 | * call to device_create(). |
| 1208 | */ |
| 1209 | void device_destroy(struct class *class, dev_t devt) |
| 1210 | { |
| 1211 | struct device *dev; |
| 1212 | |
| 1213 | dev = find_device(class, devt); |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 1214 | if (dev) |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1215 | device_unregister(dev); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1216 | } |
| 1217 | EXPORT_SYMBOL_GPL(device_destroy); |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1218 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1219 | #ifdef CONFIG_PM_SLEEP |
| 1220 | /** |
| 1221 | * destroy_suspended_device - asks the PM core to remove a suspended device |
| 1222 | * @class: pointer to the struct class that this device was registered with |
| 1223 | * @devt: the dev_t of the device that was previously registered |
| 1224 | * |
| 1225 | * This call notifies the PM core of the necessity to unregister a suspended |
| 1226 | * device created with a call to device_create() (devices cannot be |
| 1227 | * unregistered directly while suspended, since the PM core holds their |
| 1228 | * semaphores at that time). |
| 1229 | * |
| 1230 | * It can only be called within the scope of a system sleep transition. In |
| 1231 | * practice this means it has to be directly or indirectly invoked either by |
| 1232 | * a suspend or resume method, or by the PM core (e.g. via |
| 1233 | * disable_nonboot_cpus() or enable_nonboot_cpus()). |
| 1234 | */ |
| 1235 | void destroy_suspended_device(struct class *class, dev_t devt) |
| 1236 | { |
| 1237 | struct device *dev; |
| 1238 | |
| 1239 | dev = find_device(class, devt); |
| 1240 | if (dev) |
| 1241 | device_pm_schedule_removal(dev); |
| 1242 | } |
| 1243 | EXPORT_SYMBOL_GPL(destroy_suspended_device); |
| 1244 | #endif /* CONFIG_PM_SLEEP */ |
| 1245 | |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1246 | /** |
| 1247 | * device_rename - renames a device |
| 1248 | * @dev: the pointer to the struct device to be renamed |
| 1249 | * @new_name: the new name of the device |
| 1250 | */ |
| 1251 | int device_rename(struct device *dev, char *new_name) |
| 1252 | { |
| 1253 | char *old_class_name = NULL; |
| 1254 | char *new_class_name = NULL; |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1255 | char *old_device_name = NULL; |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1256 | int error; |
| 1257 | |
| 1258 | dev = get_device(dev); |
| 1259 | if (!dev) |
| 1260 | return -EINVAL; |
| 1261 | |
| 1262 | pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); |
| 1263 | |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 1264 | #ifdef CONFIG_SYSFS_DEPRECATED |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1265 | if ((dev->class) && (dev->parent)) |
| 1266 | old_class_name = make_class_name(dev->class->name, &dev->kobj); |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 1267 | #endif |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1268 | |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1269 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
| 1270 | if (!old_device_name) { |
| 1271 | error = -ENOMEM; |
| 1272 | goto out; |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1273 | } |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1274 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1275 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
| 1276 | |
| 1277 | error = kobject_rename(&dev->kobj, new_name); |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1278 | if (error) { |
| 1279 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); |
| 1280 | goto out; |
| 1281 | } |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1282 | |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 1283 | #ifdef CONFIG_SYSFS_DEPRECATED |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1284 | if (old_class_name) { |
| 1285 | new_class_name = make_class_name(dev->class->name, &dev->kobj); |
| 1286 | if (new_class_name) { |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1287 | error = sysfs_create_link(&dev->parent->kobj, |
| 1288 | &dev->kobj, new_class_name); |
| 1289 | if (error) |
| 1290 | goto out; |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1291 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
| 1292 | } |
| 1293 | } |
Kay Sievers | 60b8cab | 2007-10-26 20:07:44 +0200 | [diff] [blame] | 1294 | #else |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1295 | if (dev->class) { |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1296 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
| 1297 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
| 1298 | dev->bus_id); |
| 1299 | if (error) { |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1300 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", |
| 1301 | __FUNCTION__, error); |
| 1302 | } |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1303 | } |
Kay Sievers | 60b8cab | 2007-10-26 20:07:44 +0200 | [diff] [blame] | 1304 | #endif |
| 1305 | |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1306 | out: |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1307 | put_device(dev); |
| 1308 | |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1309 | kfree(new_class_name); |
Jesper Juhl | 952ab43 | 2006-09-28 23:56:01 +0200 | [diff] [blame] | 1310 | kfree(old_class_name); |
Cornelia Huck | 2ee97ca | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1311 | kfree(old_device_name); |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1312 | |
| 1313 | return error; |
| 1314 | } |
Johannes Berg | a2807db | 2007-02-28 12:38:31 +0100 | [diff] [blame] | 1315 | EXPORT_SYMBOL_GPL(device_rename); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1316 | |
| 1317 | static int device_move_class_links(struct device *dev, |
| 1318 | struct device *old_parent, |
| 1319 | struct device *new_parent) |
| 1320 | { |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 1321 | int error = 0; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1322 | #ifdef CONFIG_SYSFS_DEPRECATED |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1323 | char *class_name; |
| 1324 | |
| 1325 | class_name = make_class_name(dev->class->name, &dev->kobj); |
| 1326 | if (!class_name) { |
Cornelia Huck | cb360bb | 2006-11-27 10:35:05 +0100 | [diff] [blame] | 1327 | error = -ENOMEM; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1328 | goto out; |
| 1329 | } |
| 1330 | if (old_parent) { |
| 1331 | sysfs_remove_link(&dev->kobj, "device"); |
| 1332 | sysfs_remove_link(&old_parent->kobj, class_name); |
| 1333 | } |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1334 | if (new_parent) { |
| 1335 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, |
| 1336 | "device"); |
| 1337 | if (error) |
| 1338 | goto out; |
| 1339 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, |
| 1340 | class_name); |
| 1341 | if (error) |
| 1342 | sysfs_remove_link(&dev->kobj, "device"); |
| 1343 | } |
| 1344 | else |
| 1345 | error = 0; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1346 | out: |
| 1347 | kfree(class_name); |
| 1348 | return error; |
| 1349 | #else |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 1350 | if (old_parent) |
| 1351 | sysfs_remove_link(&dev->kobj, "device"); |
| 1352 | if (new_parent) |
| 1353 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, |
| 1354 | "device"); |
| 1355 | return error; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1356 | #endif |
| 1357 | } |
| 1358 | |
| 1359 | /** |
| 1360 | * device_move - moves a device to a new parent |
| 1361 | * @dev: the pointer to the struct device to be moved |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1362 | * @new_parent: the new parent of the device (can by NULL) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1363 | */ |
| 1364 | int device_move(struct device *dev, struct device *new_parent) |
| 1365 | { |
| 1366 | int error; |
| 1367 | struct device *old_parent; |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1368 | struct kobject *new_parent_kobj; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1369 | |
| 1370 | dev = get_device(dev); |
| 1371 | if (!dev) |
| 1372 | return -EINVAL; |
| 1373 | |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1374 | new_parent = get_device(new_parent); |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1375 | new_parent_kobj = get_device_parent (dev, new_parent); |
| 1376 | if (IS_ERR(new_parent_kobj)) { |
| 1377 | error = PTR_ERR(new_parent_kobj); |
| 1378 | put_device(new_parent); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1379 | goto out; |
| 1380 | } |
| 1381 | pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1382 | new_parent ? new_parent->bus_id : "<NULL>"); |
| 1383 | error = kobject_move(&dev->kobj, new_parent_kobj); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1384 | if (error) { |
| 1385 | put_device(new_parent); |
| 1386 | goto out; |
| 1387 | } |
| 1388 | old_parent = dev->parent; |
| 1389 | dev->parent = new_parent; |
| 1390 | if (old_parent) |
Cornelia Huck | acf02d2 | 2006-11-22 17:49:39 +0100 | [diff] [blame] | 1391 | klist_remove(&dev->knode_parent); |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1392 | if (new_parent) |
| 1393 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1394 | if (!dev->class) |
| 1395 | goto out_put; |
| 1396 | error = device_move_class_links(dev, old_parent, new_parent); |
| 1397 | if (error) { |
| 1398 | /* We ignore errors on cleanup since we're hosed anyway... */ |
| 1399 | device_move_class_links(dev, new_parent, old_parent); |
| 1400 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { |
Cornelia Huck | c744aeae | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1401 | if (new_parent) |
| 1402 | klist_remove(&dev->knode_parent); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1403 | if (old_parent) |
| 1404 | klist_add_tail(&dev->knode_parent, |
| 1405 | &old_parent->klist_children); |
| 1406 | } |
| 1407 | put_device(new_parent); |
| 1408 | goto out; |
| 1409 | } |
| 1410 | out_put: |
| 1411 | put_device(old_parent); |
| 1412 | out: |
| 1413 | put_device(dev); |
| 1414 | return error; |
| 1415 | } |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1416 | EXPORT_SYMBOL_GPL(device_move); |
Greg Kroah-Hartman | 37b0c02 | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 1417 | |
| 1418 | /** |
| 1419 | * device_shutdown - call ->shutdown() on each device to shutdown. |
| 1420 | */ |
| 1421 | void device_shutdown(void) |
| 1422 | { |
| 1423 | struct device * dev, *devn; |
| 1424 | |
| 1425 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, |
| 1426 | kobj.entry) { |
| 1427 | if (dev->bus && dev->bus->shutdown) { |
| 1428 | dev_dbg(dev, "shutdown\n"); |
| 1429 | dev->bus->shutdown(dev); |
| 1430 | } else if (dev->driver && dev->driver->shutdown) { |
| 1431 | dev_dbg(dev, "shutdown\n"); |
| 1432 | dev->driver->shutdown(dev); |
| 1433 | } |
| 1434 | } |
| 1435 | } |