Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * class.c - basic device class management |
| 3 | * |
| 4 | * Copyright (c) 2002-3 Patrick Mochel |
| 5 | * Copyright (c) 2002-3 Open Source Development Labs |
| 6 | * Copyright (c) 2003-2004 Greg Kroah-Hartman |
| 7 | * Copyright (c) 2003-2004 IBM Corp. |
| 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/module.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/string.h> |
| 17 | #include <linux/kdev_t.h> |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 18 | #include <linux/err.h> |
Tim Schmielau | 4e57b68 | 2005-10-30 15:03:48 -0800 | [diff] [blame] | 19 | #include <linux/slab.h> |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 20 | #include <linux/genhd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "base.h" |
| 22 | |
| 23 | #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr) |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 24 | #define to_class(obj) container_of(obj, struct class, subsys.kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 26 | static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr, |
| 27 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 29 | struct class_attribute *class_attr = to_class_attr(attr); |
| 30 | struct class *dc = to_class(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 31 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | if (class_attr->show) |
| 34 | ret = class_attr->show(dc, buf); |
| 35 | return ret; |
| 36 | } |
| 37 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 38 | static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr, |
| 39 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 41 | struct class_attribute *class_attr = to_class_attr(attr); |
| 42 | struct class *dc = to_class(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 43 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | |
| 45 | if (class_attr->store) |
| 46 | ret = class_attr->store(dc, buf, count); |
| 47 | return ret; |
| 48 | } |
| 49 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 50 | static void class_release(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
| 52 | struct class *class = to_class(kobj); |
| 53 | |
| 54 | pr_debug("class '%s': release.\n", class->name); |
| 55 | |
| 56 | if (class->class_release) |
| 57 | class->class_release(class); |
| 58 | else |
| 59 | pr_debug("class '%s' does not have a release() function, " |
| 60 | "be careful\n", class->name); |
| 61 | } |
| 62 | |
| 63 | static struct sysfs_ops class_sysfs_ops = { |
| 64 | .show = class_attr_show, |
| 65 | .store = class_attr_store, |
| 66 | }; |
| 67 | |
Greg Kroah-Hartman | adc5680 | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 68 | static struct kobj_type class_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | .sysfs_ops = &class_sysfs_ops, |
| 70 | .release = class_release, |
| 71 | }; |
| 72 | |
| 73 | /* Hotplug events for classes go to the class_obj subsys */ |
Greg Kroah-Hartman | 443dbf9 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 74 | static struct kset *class_kset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
| 76 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 77 | int class_create_file(struct class *cls, const struct class_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { |
| 79 | int error; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 80 | if (cls) |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 81 | error = sysfs_create_file(&cls->subsys.kobj, &attr->attr); |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 82 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | error = -EINVAL; |
| 84 | return error; |
| 85 | } |
| 86 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 87 | void class_remove_file(struct class *cls, const struct class_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | { |
| 89 | if (cls) |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 90 | sysfs_remove_file(&cls->subsys.kobj, &attr->attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | |
Greg Kroah-Hartman | 1740757 | 2006-05-02 16:59:59 +0200 | [diff] [blame] | 93 | static struct class *class_get(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | { |
| 95 | if (cls) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 96 | return container_of(kset_get(&cls->subsys), |
| 97 | struct class, subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | return NULL; |
| 99 | } |
| 100 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 101 | static void class_put(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Greg Kroah-Hartman | 51d172d | 2005-10-27 22:25:43 -0700 | [diff] [blame] | 103 | if (cls) |
Greg Kroah-Hartman | 6e9d930 | 2007-09-12 15:06:57 -0700 | [diff] [blame] | 104 | kset_put(&cls->subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 107 | static int add_class_attrs(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
| 109 | int i; |
| 110 | int error = 0; |
| 111 | |
| 112 | if (cls->class_attrs) { |
| 113 | for (i = 0; attr_name(cls->class_attrs[i]); i++) { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 114 | error = class_create_file(cls, &cls->class_attrs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | if (error) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 116 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
| 118 | } |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 119 | done: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | return error; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 121 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | while (--i >= 0) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 123 | class_remove_file(cls, &cls->class_attrs[i]); |
| 124 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | } |
| 126 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 127 | static void remove_class_attrs(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | { |
| 129 | int i; |
| 130 | |
| 131 | if (cls->class_attrs) { |
| 132 | for (i = 0; attr_name(cls->class_attrs[i]); i++) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 133 | class_remove_file(cls, &cls->class_attrs[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | } |
| 136 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 137 | int class_register(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
| 139 | int error; |
| 140 | |
| 141 | pr_debug("device class '%s': registering\n", cls->name); |
| 142 | |
| 143 | INIT_LIST_HEAD(&cls->children); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 144 | INIT_LIST_HEAD(&cls->devices); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | INIT_LIST_HEAD(&cls->interfaces); |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 146 | kset_init(&cls->class_dirs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | init_MUTEX(&cls->sem); |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 148 | error = kobject_set_name(&cls->subsys.kobj, "%s", cls->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | if (error) |
| 150 | return error; |
| 151 | |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 152 | #if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK) |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 153 | /* let the block class directory show up in the root of sysfs */ |
| 154 | if (cls != &block_class) |
| 155 | cls->subsys.kobj.kset = class_kset; |
| 156 | #else |
Greg Kroah-Hartman | 443dbf9 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 157 | cls->subsys.kobj.kset = class_kset; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 158 | #endif |
Greg Kroah-Hartman | 3514fac | 2007-10-16 10:11:44 -0600 | [diff] [blame] | 159 | cls->subsys.kobj.ktype = &class_ktype; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Greg Kroah-Hartman | 2fb9113 | 2007-11-06 15:03:30 -0800 | [diff] [blame] | 161 | error = kset_register(&cls->subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (!error) { |
| 163 | error = add_class_attrs(class_get(cls)); |
| 164 | class_put(cls); |
| 165 | } |
| 166 | return error; |
| 167 | } |
| 168 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 169 | void class_unregister(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | { |
| 171 | pr_debug("device class '%s': unregistering\n", cls->name); |
| 172 | remove_class_attrs(cls); |
Greg Kroah-Hartman | 2fb9113 | 2007-11-06 15:03:30 -0800 | [diff] [blame] | 173 | kset_unregister(&cls->subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
| 175 | |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 176 | static void class_create_release(struct class *cls) |
| 177 | { |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 178 | pr_debug("%s called for %s\n", __func__, cls->name); |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 179 | kfree(cls); |
| 180 | } |
| 181 | |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 182 | /** |
| 183 | * class_create - create a struct class structure |
| 184 | * @owner: pointer to the module that is to "own" this struct class |
| 185 | * @name: pointer to a string for the name of this class. |
| 186 | * |
| 187 | * This is used to create a struct class pointer that can then be used |
Kay Sievers | c3b19ff | 2008-03-12 20:47:35 +0100 | [diff] [blame] | 188 | * in calls to device_create(). |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 189 | * |
| 190 | * Note, the pointer created here is to be destroyed when finished by |
| 191 | * making a call to class_destroy(). |
| 192 | */ |
Miguel Ojeda Sandonis | ab7d737 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 193 | struct class *class_create(struct module *owner, const char *name) |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 194 | { |
| 195 | struct class *cls; |
| 196 | int retval; |
| 197 | |
Jiri Slaby | 4aed064 | 2005-09-13 01:25:01 -0700 | [diff] [blame] | 198 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 199 | if (!cls) { |
| 200 | retval = -ENOMEM; |
| 201 | goto error; |
| 202 | } |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 203 | |
| 204 | cls->name = name; |
| 205 | cls->owner = owner; |
| 206 | cls->class_release = class_create_release; |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 207 | |
| 208 | retval = class_register(cls); |
| 209 | if (retval) |
| 210 | goto error; |
| 211 | |
| 212 | return cls; |
| 213 | |
| 214 | error: |
| 215 | kfree(cls); |
| 216 | return ERR_PTR(retval); |
| 217 | } |
| 218 | |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 219 | /** |
| 220 | * class_destroy - destroys a struct class structure |
Rolf Eike Beer | 92a0f86 | 2006-09-29 01:59:13 -0700 | [diff] [blame] | 221 | * @cls: pointer to the struct class that is to be destroyed |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 222 | * |
| 223 | * Note, the pointer to be destroyed must have been created with a call |
| 224 | * to class_create(). |
| 225 | */ |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 226 | void class_destroy(struct class *cls) |
| 227 | { |
| 228 | if ((cls == NULL) || (IS_ERR(cls))) |
| 229 | return; |
| 230 | |
| 231 | class_unregister(cls); |
| 232 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | |
Kay Sievers | 805fab4 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 234 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 235 | char *make_class_name(const char *name, struct kobject *kobj) |
| 236 | { |
| 237 | char *class_name; |
| 238 | int size; |
| 239 | |
| 240 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; |
| 241 | |
| 242 | class_name = kmalloc(size, GFP_KERNEL); |
| 243 | if (!class_name) |
Cornelia Huck | cb360bb | 2006-11-27 10:35:05 +0100 | [diff] [blame] | 244 | return NULL; |
Kay Sievers | 805fab4 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 245 | |
| 246 | strcpy(class_name, name); |
| 247 | strcat(class_name, ":"); |
| 248 | strcat(class_name, kobject_name(kobj)); |
| 249 | return class_name; |
| 250 | } |
Kay Sievers | 805fab4 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 251 | #endif |
| 252 | |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 253 | /** |
| 254 | * class_for_each_device - device iterator |
| 255 | * @class: the class we're iterating |
| 256 | * @data: data for the callback |
| 257 | * @fn: function to be called for each device |
| 258 | * |
| 259 | * Iterate over @class's list of devices, and call @fn for each, |
| 260 | * passing it @data. |
| 261 | * |
| 262 | * We check the return of @fn each time. If it returns anything |
| 263 | * other than 0, we break out and return that value. |
| 264 | * |
| 265 | * Note, we hold class->sem in this function, so it can not be |
| 266 | * re-acquired in @fn, otherwise it will self-deadlocking. For |
| 267 | * example, calls to add or remove class members would be verboten. |
| 268 | */ |
| 269 | int class_for_each_device(struct class *class, void *data, |
| 270 | int (*fn)(struct device *, void *)) |
| 271 | { |
| 272 | struct device *dev; |
| 273 | int error = 0; |
| 274 | |
| 275 | if (!class) |
| 276 | return -EINVAL; |
| 277 | down(&class->sem); |
| 278 | list_for_each_entry(dev, &class->devices, node) { |
| 279 | dev = get_device(dev); |
| 280 | if (dev) { |
| 281 | error = fn(dev, data); |
| 282 | put_device(dev); |
| 283 | } else |
| 284 | error = -ENODEV; |
| 285 | if (error) |
| 286 | break; |
| 287 | } |
| 288 | up(&class->sem); |
| 289 | |
| 290 | return error; |
| 291 | } |
| 292 | EXPORT_SYMBOL_GPL(class_for_each_device); |
| 293 | |
| 294 | /** |
| 295 | * class_find_device - device iterator for locating a particular device |
| 296 | * @class: the class we're iterating |
| 297 | * @data: data for the match function |
| 298 | * @match: function to check device |
| 299 | * |
| 300 | * This is similar to the class_for_each_dev() function above, but it |
| 301 | * returns a reference to a device that is 'found' for later use, as |
| 302 | * determined by the @match callback. |
| 303 | * |
| 304 | * The callback should return 0 if the device doesn't match and non-zero |
| 305 | * if it does. If the callback returns non-zero, this function will |
| 306 | * return to the caller and not iterate over any more devices. |
Randy Dunlap | a63ca8f | 2008-01-30 11:51:08 -0800 | [diff] [blame] | 307 | * |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 308 | * Note, you will need to drop the reference with put_device() after use. |
| 309 | * |
| 310 | * We hold class->sem in this function, so it can not be |
| 311 | * re-acquired in @match, otherwise it will self-deadlocking. For |
| 312 | * example, calls to add or remove class members would be verboten. |
| 313 | */ |
| 314 | struct device *class_find_device(struct class *class, void *data, |
| 315 | int (*match)(struct device *, void *)) |
| 316 | { |
| 317 | struct device *dev; |
| 318 | int found = 0; |
| 319 | |
| 320 | if (!class) |
| 321 | return NULL; |
| 322 | |
| 323 | down(&class->sem); |
| 324 | list_for_each_entry(dev, &class->devices, node) { |
| 325 | dev = get_device(dev); |
| 326 | if (dev) { |
| 327 | if (match(dev, data)) { |
| 328 | found = 1; |
| 329 | break; |
| 330 | } else |
| 331 | put_device(dev); |
| 332 | } else |
| 333 | break; |
| 334 | } |
| 335 | up(&class->sem); |
| 336 | |
| 337 | return found ? dev : NULL; |
| 338 | } |
| 339 | EXPORT_SYMBOL_GPL(class_find_device); |
| 340 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | int class_interface_register(struct class_interface *class_intf) |
| 342 | { |
| 343 | struct class *parent; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 344 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
| 346 | if (!class_intf || !class_intf->class) |
| 347 | return -ENODEV; |
| 348 | |
| 349 | parent = class_get(class_intf->class); |
| 350 | if (!parent) |
| 351 | return -EINVAL; |
| 352 | |
| 353 | down(&parent->sem); |
| 354 | list_add_tail(&class_intf->node, &parent->interfaces); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 355 | if (class_intf->add_dev) { |
| 356 | list_for_each_entry(dev, &parent->devices, node) |
| 357 | class_intf->add_dev(dev, class_intf); |
| 358 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | up(&parent->sem); |
| 360 | |
| 361 | return 0; |
| 362 | } |
| 363 | |
| 364 | void class_interface_unregister(struct class_interface *class_intf) |
| 365 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 366 | struct class *parent = class_intf->class; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 367 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | if (!parent) |
| 370 | return; |
| 371 | |
| 372 | down(&parent->sem); |
| 373 | list_del_init(&class_intf->node); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 374 | if (class_intf->remove_dev) { |
| 375 | list_for_each_entry(dev, &parent->devices, node) |
| 376 | class_intf->remove_dev(dev, class_intf); |
| 377 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | up(&parent->sem); |
| 379 | |
| 380 | class_put(parent); |
| 381 | } |
| 382 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | int __init classes_init(void) |
| 384 | { |
Greg Kroah-Hartman | 443dbf9 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 385 | class_kset = kset_create_and_add("class", NULL, NULL); |
| 386 | if (!class_kset) |
| 387 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | return 0; |
| 389 | } |
| 390 | |
| 391 | EXPORT_SYMBOL_GPL(class_create_file); |
| 392 | EXPORT_SYMBOL_GPL(class_remove_file); |
| 393 | EXPORT_SYMBOL_GPL(class_register); |
| 394 | EXPORT_SYMBOL_GPL(class_unregister); |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 395 | EXPORT_SYMBOL_GPL(class_create); |
| 396 | EXPORT_SYMBOL_GPL(class_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | EXPORT_SYMBOL_GPL(class_interface_register); |
| 399 | EXPORT_SYMBOL_GPL(class_interface_unregister); |