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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 25 | static ssize_t class_attr_show(struct kobject *kobj, struct attribute *attr, |
| 26 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 28 | struct class_attribute *class_attr = to_class_attr(attr); |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 29 | struct class_private *cp = to_class(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 30 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
| 32 | if (class_attr->show) |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 33 | ret = class_attr->show(cp->class, buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | return ret; |
| 35 | } |
| 36 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 37 | static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr, |
| 38 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 40 | struct class_attribute *class_attr = to_class_attr(attr); |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 41 | struct class_private *cp = to_class(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 42 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
| 44 | if (class_attr->store) |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 45 | ret = class_attr->store(cp->class, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | return ret; |
| 47 | } |
| 48 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 49 | static void class_release(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 51 | struct class_private *cp = to_class(kobj); |
| 52 | struct class *class = cp->class; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 73 | /* Hotplug events for classes go to the class class_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 | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 81 | error = sysfs_create_file(&cls->p->class_subsys.kobj, |
| 82 | &attr->attr); |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 83 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | error = -EINVAL; |
| 85 | return error; |
| 86 | } |
| 87 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 88 | void class_remove_file(struct class *cls, const struct class_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
| 90 | if (cls) |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 91 | sysfs_remove_file(&cls->p->class_subsys.kobj, &attr->attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | } |
| 93 | |
Greg Kroah-Hartman | 1740757 | 2006-05-02 16:59:59 +0200 | [diff] [blame] | 94 | static struct class *class_get(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
| 96 | if (cls) |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 97 | kset_get(&cls->p->class_subsys); |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 98 | return cls; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 104 | kset_put(&cls->p->class_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 | { |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 139 | struct class_private *cp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | int error; |
| 141 | |
| 142 | pr_debug("device class '%s': registering\n", cls->name); |
| 143 | |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 144 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
| 145 | if (!cp) |
| 146 | return -ENOMEM; |
Greg Kroah-Hartman | 97ae69f | 2008-05-28 09:28:39 -0700 | [diff] [blame] | 147 | INIT_LIST_HEAD(&cp->class_devices); |
Greg Kroah-Hartman | 184f1f7 | 2008-05-28 09:28:39 -0700 | [diff] [blame] | 148 | INIT_LIST_HEAD(&cp->class_interfaces); |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 149 | kset_init(&cp->class_dirs); |
| 150 | init_MUTEX(&cp->sem); |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 151 | error = kobject_set_name(&cp->class_subsys.kobj, "%s", cls->name); |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 152 | if (error) { |
| 153 | kfree(cp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | return error; |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 155 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
Dan Williams | e105b8b | 2008-04-21 10:51:07 -0700 | [diff] [blame] | 157 | /* set the default /sys/dev directory for devices of this class */ |
| 158 | if (!cls->dev_kobj) |
| 159 | cls->dev_kobj = sysfs_dev_char_kobj; |
| 160 | |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 161 | #if defined(CONFIG_SYSFS_DEPRECATED) && defined(CONFIG_BLOCK) |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 162 | /* let the block class directory show up in the root of sysfs */ |
| 163 | if (cls != &block_class) |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 164 | cp->class_subsys.kobj.kset = class_kset; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 165 | #else |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 166 | cp->class_subsys.kobj.kset = class_kset; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 167 | #endif |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 168 | cp->class_subsys.kobj.ktype = &class_ktype; |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 169 | cp->class = cls; |
| 170 | cls->p = cp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 172 | error = kset_register(&cp->class_subsys); |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 173 | if (error) { |
| 174 | kfree(cp); |
| 175 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 177 | error = add_class_attrs(class_get(cls)); |
| 178 | class_put(cls); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return error; |
| 180 | } |
| 181 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 182 | void class_unregister(struct class *cls) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
| 184 | pr_debug("device class '%s': unregistering\n", cls->name); |
| 185 | remove_class_attrs(cls); |
Greg Kroah-Hartman | 1fbfee6 | 2008-05-28 09:28:39 -0700 | [diff] [blame^] | 186 | kset_unregister(&cls->p->class_subsys); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 189 | static void class_create_release(struct class *cls) |
| 190 | { |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 191 | pr_debug("%s called for %s\n", __func__, cls->name); |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 192 | kfree(cls); |
| 193 | } |
| 194 | |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 195 | /** |
| 196 | * class_create - create a struct class structure |
| 197 | * @owner: pointer to the module that is to "own" this struct class |
| 198 | * @name: pointer to a string for the name of this class. |
| 199 | * |
| 200 | * 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] | 201 | * in calls to device_create(). |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 202 | * |
| 203 | * Note, the pointer created here is to be destroyed when finished by |
| 204 | * making a call to class_destroy(). |
| 205 | */ |
Miguel Ojeda Sandonis | ab7d737 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 206 | struct class *class_create(struct module *owner, const char *name) |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 207 | { |
| 208 | struct class *cls; |
| 209 | int retval; |
| 210 | |
Jiri Slaby | 4aed064 | 2005-09-13 01:25:01 -0700 | [diff] [blame] | 211 | cls = kzalloc(sizeof(*cls), GFP_KERNEL); |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 212 | if (!cls) { |
| 213 | retval = -ENOMEM; |
| 214 | goto error; |
| 215 | } |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 216 | |
| 217 | cls->name = name; |
| 218 | cls->owner = owner; |
| 219 | cls->class_release = class_create_release; |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 220 | |
| 221 | retval = class_register(cls); |
| 222 | if (retval) |
| 223 | goto error; |
| 224 | |
| 225 | return cls; |
| 226 | |
| 227 | error: |
| 228 | kfree(cls); |
| 229 | return ERR_PTR(retval); |
| 230 | } |
| 231 | |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 232 | /** |
| 233 | * class_destroy - destroys a struct class structure |
Rolf Eike Beer | 92a0f86 | 2006-09-29 01:59:13 -0700 | [diff] [blame] | 234 | * @cls: pointer to the struct class that is to be destroyed |
gregkh@suse.de | 2fc6844 | 2005-03-23 10:02:56 -0800 | [diff] [blame] | 235 | * |
| 236 | * Note, the pointer to be destroyed must have been created with a call |
| 237 | * to class_create(). |
| 238 | */ |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 239 | void class_destroy(struct class *cls) |
| 240 | { |
| 241 | if ((cls == NULL) || (IS_ERR(cls))) |
| 242 | return; |
| 243 | |
| 244 | class_unregister(cls); |
| 245 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
Kay Sievers | 805fab4 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 247 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 248 | char *make_class_name(const char *name, struct kobject *kobj) |
| 249 | { |
| 250 | char *class_name; |
| 251 | int size; |
| 252 | |
| 253 | size = strlen(name) + strlen(kobject_name(kobj)) + 2; |
| 254 | |
| 255 | class_name = kmalloc(size, GFP_KERNEL); |
| 256 | if (!class_name) |
Cornelia Huck | cb360bb | 2006-11-27 10:35:05 +0100 | [diff] [blame] | 257 | return NULL; |
Kay Sievers | 805fab4 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 258 | |
| 259 | strcpy(class_name, name); |
| 260 | strcat(class_name, ":"); |
| 261 | strcat(class_name, kobject_name(kobj)); |
| 262 | return class_name; |
| 263 | } |
Kay Sievers | 805fab4 | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 264 | #endif |
| 265 | |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 266 | /** |
| 267 | * class_for_each_device - device iterator |
| 268 | * @class: the class we're iterating |
Greg Kroah-Hartman | 93562b5 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 269 | * @start: the device to start with in the list, if any. |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 270 | * @data: data for the callback |
| 271 | * @fn: function to be called for each device |
| 272 | * |
| 273 | * Iterate over @class's list of devices, and call @fn for each, |
Greg Kroah-Hartman | 93562b5 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 274 | * passing it @data. If @start is set, the list iteration will start |
| 275 | * there, otherwise if it is NULL, the iteration starts at the |
| 276 | * beginning of the list. |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 277 | * |
| 278 | * We check the return of @fn each time. If it returns anything |
| 279 | * other than 0, we break out and return that value. |
| 280 | * |
| 281 | * Note, we hold class->sem in this function, so it can not be |
| 282 | * re-acquired in @fn, otherwise it will self-deadlocking. For |
| 283 | * example, calls to add or remove class members would be verboten. |
| 284 | */ |
Greg Kroah-Hartman | 93562b5 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 285 | int class_for_each_device(struct class *class, struct device *start, |
| 286 | void *data, int (*fn)(struct device *, void *)) |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 287 | { |
| 288 | struct device *dev; |
| 289 | int error = 0; |
| 290 | |
| 291 | if (!class) |
| 292 | return -EINVAL; |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 293 | down(&class->p->sem); |
Greg Kroah-Hartman | 97ae69f | 2008-05-28 09:28:39 -0700 | [diff] [blame] | 294 | list_for_each_entry(dev, &class->p->class_devices, node) { |
Greg Kroah-Hartman | 93562b5 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 295 | if (start) { |
| 296 | if (start == dev) |
| 297 | start = NULL; |
| 298 | continue; |
| 299 | } |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 300 | dev = get_device(dev); |
Greg Kroah-Hartman | 93562b5 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 301 | error = fn(dev, data); |
| 302 | put_device(dev); |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 303 | if (error) |
| 304 | break; |
| 305 | } |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 306 | up(&class->p->sem); |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 307 | |
| 308 | return error; |
| 309 | } |
| 310 | EXPORT_SYMBOL_GPL(class_for_each_device); |
| 311 | |
| 312 | /** |
| 313 | * class_find_device - device iterator for locating a particular device |
| 314 | * @class: the class we're iterating |
Greg Kroah-Hartman | 695794a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 315 | * @start: Device to begin with |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 316 | * @data: data for the match function |
| 317 | * @match: function to check device |
| 318 | * |
| 319 | * This is similar to the class_for_each_dev() function above, but it |
| 320 | * returns a reference to a device that is 'found' for later use, as |
| 321 | * determined by the @match callback. |
| 322 | * |
| 323 | * The callback should return 0 if the device doesn't match and non-zero |
| 324 | * if it does. If the callback returns non-zero, this function will |
| 325 | * return to the caller and not iterate over any more devices. |
Randy Dunlap | a63ca8f | 2008-01-30 11:51:08 -0800 | [diff] [blame] | 326 | * |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 327 | * Note, you will need to drop the reference with put_device() after use. |
| 328 | * |
| 329 | * We hold class->sem in this function, so it can not be |
| 330 | * re-acquired in @match, otherwise it will self-deadlocking. For |
| 331 | * example, calls to add or remove class members would be verboten. |
| 332 | */ |
Greg Kroah-Hartman | 695794a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 333 | struct device *class_find_device(struct class *class, struct device *start, |
| 334 | void *data, |
| 335 | int (*match)(struct device *, void *)) |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 336 | { |
| 337 | struct device *dev; |
| 338 | int found = 0; |
| 339 | |
| 340 | if (!class) |
| 341 | return NULL; |
| 342 | |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 343 | down(&class->p->sem); |
Greg Kroah-Hartman | 97ae69f | 2008-05-28 09:28:39 -0700 | [diff] [blame] | 344 | list_for_each_entry(dev, &class->p->class_devices, node) { |
Greg Kroah-Hartman | 695794a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 345 | if (start) { |
| 346 | if (start == dev) |
| 347 | start = NULL; |
| 348 | continue; |
| 349 | } |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 350 | dev = get_device(dev); |
Greg Kroah-Hartman | 695794a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 351 | if (match(dev, data)) { |
| 352 | found = 1; |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 353 | break; |
Greg Kroah-Hartman | 695794a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 354 | } else |
| 355 | put_device(dev); |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 356 | } |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 357 | up(&class->p->sem); |
Dave Young | fd04897 | 2008-01-22 15:27:08 +0800 | [diff] [blame] | 358 | |
| 359 | return found ? dev : NULL; |
| 360 | } |
| 361 | EXPORT_SYMBOL_GPL(class_find_device); |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | int class_interface_register(struct class_interface *class_intf) |
| 364 | { |
| 365 | struct class *parent; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 366 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | if (!class_intf || !class_intf->class) |
| 369 | return -ENODEV; |
| 370 | |
| 371 | parent = class_get(class_intf->class); |
| 372 | if (!parent) |
| 373 | return -EINVAL; |
| 374 | |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 375 | down(&parent->p->sem); |
Greg Kroah-Hartman | 184f1f7 | 2008-05-28 09:28:39 -0700 | [diff] [blame] | 376 | list_add_tail(&class_intf->node, &parent->p->class_interfaces); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 377 | if (class_intf->add_dev) { |
Greg Kroah-Hartman | 97ae69f | 2008-05-28 09:28:39 -0700 | [diff] [blame] | 378 | list_for_each_entry(dev, &parent->p->class_devices, node) |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 379 | class_intf->add_dev(dev, class_intf); |
| 380 | } |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 381 | up(&parent->p->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
| 383 | return 0; |
| 384 | } |
| 385 | |
| 386 | void class_interface_unregister(struct class_interface *class_intf) |
| 387 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 388 | struct class *parent = class_intf->class; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 389 | struct device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | if (!parent) |
| 392 | return; |
| 393 | |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 394 | down(&parent->p->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | list_del_init(&class_intf->node); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 396 | if (class_intf->remove_dev) { |
Greg Kroah-Hartman | 97ae69f | 2008-05-28 09:28:39 -0700 | [diff] [blame] | 397 | list_for_each_entry(dev, &parent->p->class_devices, node) |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 398 | class_intf->remove_dev(dev, class_intf); |
| 399 | } |
Greg Kroah-Hartman | 7c71448 | 2008-01-22 18:17:41 -0500 | [diff] [blame] | 400 | up(&parent->p->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | |
| 402 | class_put(parent); |
| 403 | } |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | int __init classes_init(void) |
| 406 | { |
Greg Kroah-Hartman | 443dbf9 | 2007-10-29 23:22:26 -0500 | [diff] [blame] | 407 | class_kset = kset_create_and_add("class", NULL, NULL); |
| 408 | if (!class_kset) |
| 409 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | return 0; |
| 411 | } |
| 412 | |
| 413 | EXPORT_SYMBOL_GPL(class_create_file); |
| 414 | EXPORT_SYMBOL_GPL(class_remove_file); |
| 415 | EXPORT_SYMBOL_GPL(class_register); |
| 416 | EXPORT_SYMBOL_GPL(class_unregister); |
gregkh@suse.de | e9ba636 | 2005-03-15 11:54:21 -0800 | [diff] [blame] | 417 | EXPORT_SYMBOL_GPL(class_create); |
| 418 | EXPORT_SYMBOL_GPL(class_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | EXPORT_SYMBOL_GPL(class_interface_register); |
| 421 | EXPORT_SYMBOL_GPL(class_interface_unregister); |