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> |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 21 | #include <linux/genhd.h> |
Andrew Morton | 815d2d5 | 2008-03-04 15:09:07 -0800 | [diff] [blame] | 22 | #include <linux/kallsyms.h> |
Matthew Wilcox | 6188e10 | 2008-04-18 22:21:05 -0400 | [diff] [blame] | 23 | #include <linux/semaphore.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include "base.h" |
| 26 | #include "power/power.h" |
| 27 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 28 | int (*platform_notify)(struct device *dev) = NULL; |
| 29 | int (*platform_notify_remove)(struct device *dev) = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 31 | #ifdef CONFIG_BLOCK |
| 32 | static inline int device_is_not_partition(struct device *dev) |
| 33 | { |
| 34 | return !(dev->type == &part_type); |
| 35 | } |
| 36 | #else |
| 37 | static inline int device_is_not_partition(struct device *dev) |
| 38 | { |
| 39 | return 1; |
| 40 | } |
| 41 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Alan Stern | 3e95637 | 2006-06-16 17:10:48 -0400 | [diff] [blame] | 43 | /** |
| 44 | * dev_driver_string - Return a device's driver name, if at all possible |
| 45 | * @dev: struct device to get the name of |
| 46 | * |
| 47 | * Will return the device's driver's name if it is bound to a device. If |
| 48 | * the device is not bound to a device, it will return the name of the bus |
| 49 | * it is attached to. If it is not attached to a bus either, an empty |
| 50 | * string will be returned. |
| 51 | */ |
| 52 | const char *dev_driver_string(struct device *dev) |
| 53 | { |
| 54 | return dev->driver ? dev->driver->name : |
Jean Delvare | a456b70 | 2007-03-09 16:33:10 +0100 | [diff] [blame] | 55 | (dev->bus ? dev->bus->name : |
| 56 | (dev->class ? dev->class->name : "")); |
Alan Stern | 3e95637 | 2006-06-16 17:10:48 -0400 | [diff] [blame] | 57 | } |
Matthew Wilcox | 310a922 | 2006-09-23 23:35:04 -0600 | [diff] [blame] | 58 | EXPORT_SYMBOL(dev_driver_string); |
Alan Stern | 3e95637 | 2006-06-16 17:10:48 -0400 | [diff] [blame] | 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #define to_dev(obj) container_of(obj, struct device, kobj) |
| 61 | #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
| 62 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 63 | static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
| 64 | char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 66 | struct device_attribute *dev_attr = to_dev_attr(attr); |
| 67 | struct device *dev = to_dev(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 68 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | if (dev_attr->show) |
Yani Ioannou | 54b6f35 | 2005-05-17 06:39:34 -0400 | [diff] [blame] | 71 | ret = dev_attr->show(dev, dev_attr, buf); |
Andrew Morton | 815d2d5 | 2008-03-04 15:09:07 -0800 | [diff] [blame] | 72 | if (ret >= (ssize_t)PAGE_SIZE) { |
| 73 | print_symbol("dev_attr_show: %s returned bad count\n", |
| 74 | (unsigned long)dev_attr->show); |
| 75 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | return ret; |
| 77 | } |
| 78 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 79 | static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
| 80 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 82 | struct device_attribute *dev_attr = to_dev_attr(attr); |
| 83 | struct device *dev = to_dev(kobj); |
Dmitry Torokhov | 4a0c20b | 2005-04-29 01:23:47 -0500 | [diff] [blame] | 84 | ssize_t ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | |
| 86 | if (dev_attr->store) |
Yani Ioannou | 54b6f35 | 2005-05-17 06:39:34 -0400 | [diff] [blame] | 87 | ret = dev_attr->store(dev, dev_attr, buf, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | return ret; |
| 89 | } |
| 90 | |
| 91 | static struct sysfs_ops dev_sysfs_ops = { |
| 92 | .show = dev_attr_show, |
| 93 | .store = dev_attr_store, |
| 94 | }; |
| 95 | |
| 96 | |
| 97 | /** |
| 98 | * device_release - free device structure. |
| 99 | * @kobj: device's kobject. |
| 100 | * |
| 101 | * This is called once the reference count for the object |
| 102 | * reaches 0. We forward the call to the device's release |
| 103 | * method, which should handle actually freeing the structure. |
| 104 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 105 | static void device_release(struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 107 | struct device *dev = to_dev(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
| 109 | if (dev->release) |
| 110 | dev->release(dev); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 111 | else if (dev->type && dev->type->release) |
| 112 | dev->type->release(dev); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 113 | else if (dev->class && dev->class->dev_release) |
| 114 | dev->class->dev_release(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | else { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 116 | printk(KERN_ERR "Device '%s' does not have a release() " |
| 117 | "function, it is broken and must be fixed.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | dev->bus_id); |
| 119 | WARN_ON(1); |
| 120 | } |
| 121 | } |
| 122 | |
Greg Kroah-Hartman | 8f4afc4 | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 123 | static struct kobj_type device_ktype = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | .release = device_release, |
| 125 | .sysfs_ops = &dev_sysfs_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | }; |
| 127 | |
| 128 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 129 | static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | { |
| 131 | struct kobj_type *ktype = get_ktype(kobj); |
| 132 | |
Greg Kroah-Hartman | 8f4afc4 | 2007-10-11 10:47:49 -0600 | [diff] [blame] | 133 | if (ktype == &device_ktype) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | struct device *dev = to_dev(kobj); |
Cornelia Huck | 83b5fb4c | 2007-03-29 11:12:11 +0200 | [diff] [blame] | 135 | if (dev->uevent_suppress) |
| 136 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | if (dev->bus) |
| 138 | return 1; |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 139 | if (dev->class) |
| 140 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | } |
| 142 | return 0; |
| 143 | } |
| 144 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 145 | static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
| 147 | struct device *dev = to_dev(kobj); |
| 148 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 149 | if (dev->bus) |
| 150 | return dev->bus->name; |
| 151 | if (dev->class) |
| 152 | return dev->class->name; |
| 153 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 156 | static int dev_uevent(struct kset *kset, struct kobject *kobj, |
| 157 | struct kobj_uevent_env *env) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | { |
| 159 | struct device *dev = to_dev(kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | int retval = 0; |
| 161 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 162 | /* add the major/minor if present */ |
| 163 | if (MAJOR(dev->devt)) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 164 | add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
| 165 | add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 166 | } |
| 167 | |
Kay Sievers | 414264f | 2007-03-12 21:08:57 +0100 | [diff] [blame] | 168 | if (dev->type && dev->type->name) |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 169 | add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
Kay Sievers | 414264f | 2007-03-12 21:08:57 +0100 | [diff] [blame] | 170 | |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 171 | if (dev->driver) |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 172 | add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 173 | |
Kay Sievers | a87cb2a | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 174 | #ifdef CONFIG_SYSFS_DEPRECATED |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 175 | if (dev->class) { |
| 176 | struct device *parent = dev->parent; |
| 177 | |
| 178 | /* find first bus device in parent chain */ |
| 179 | while (parent && !parent->bus) |
| 180 | parent = parent->parent; |
| 181 | if (parent && parent->bus) { |
| 182 | const char *path; |
| 183 | |
| 184 | path = kobject_get_path(&parent->kobj, GFP_KERNEL); |
Kay Sievers | 2c7afd1 | 2007-05-01 13:46:26 +0200 | [diff] [blame] | 185 | if (path) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 186 | add_uevent_var(env, "PHYSDEVPATH=%s", path); |
Kay Sievers | 2c7afd1 | 2007-05-01 13:46:26 +0200 | [diff] [blame] | 187 | kfree(path); |
| 188 | } |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 189 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 190 | add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 191 | |
| 192 | if (parent->driver) |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 193 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
| 194 | parent->driver->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 195 | } |
| 196 | } else if (dev->bus) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 197 | add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 198 | |
| 199 | if (dev->driver) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 200 | add_uevent_var(env, "PHYSDEVDRIVER=%s", |
| 201 | dev->driver->name); |
Kay Sievers | d81d9d6 | 2006-08-13 06:17:09 +0200 | [diff] [blame] | 202 | } |
Kay Sievers | 239378f | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 203 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 205 | /* have the bus specific function add its stuff */ |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 206 | if (dev->bus && dev->bus->uevent) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 207 | retval = dev->bus->uevent(dev, env); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 208 | if (retval) |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 209 | pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 210 | dev->bus_id, __func__, retval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 213 | /* have the class specific function add its stuff */ |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 214 | if (dev->class && dev->class->dev_uevent) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 215 | retval = dev->class->dev_uevent(dev, env); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 216 | if (retval) |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 217 | pr_debug("device: '%s': %s: class uevent() " |
| 218 | "returned %d\n", dev->bus_id, |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 219 | __func__, retval); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 220 | } |
| 221 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 222 | /* have the device type specific fuction add its stuff */ |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 223 | if (dev->type && dev->type->uevent) { |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 224 | retval = dev->type->uevent(dev, env); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 225 | if (retval) |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 226 | pr_debug("device: '%s': %s: dev_type uevent() " |
| 227 | "returned %d\n", dev->bus_id, |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 228 | __func__, retval); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | return retval; |
| 232 | } |
| 233 | |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 234 | static struct kset_uevent_ops device_uevent_ops = { |
| 235 | .filter = dev_uevent_filter, |
| 236 | .name = dev_uevent_name, |
| 237 | .uevent = dev_uevent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | }; |
| 239 | |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 240 | static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, |
| 241 | char *buf) |
| 242 | { |
| 243 | struct kobject *top_kobj; |
| 244 | struct kset *kset; |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 245 | struct kobj_uevent_env *env = NULL; |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 246 | int i; |
| 247 | size_t count = 0; |
| 248 | int retval; |
| 249 | |
| 250 | /* search the kset, the device belongs to */ |
| 251 | top_kobj = &dev->kobj; |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 252 | while (!top_kobj->kset && top_kobj->parent) |
| 253 | top_kobj = top_kobj->parent; |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 254 | if (!top_kobj->kset) |
| 255 | goto out; |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 256 | |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 257 | kset = top_kobj->kset; |
| 258 | if (!kset->uevent_ops || !kset->uevent_ops->uevent) |
| 259 | goto out; |
| 260 | |
| 261 | /* respect filter */ |
| 262 | if (kset->uevent_ops && kset->uevent_ops->filter) |
| 263 | if (!kset->uevent_ops->filter(kset, &dev->kobj)) |
| 264 | goto out; |
| 265 | |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 266 | env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
| 267 | if (!env) |
Greg Kroah-Hartman | c7308c8 | 2007-05-02 14:14:11 +0200 | [diff] [blame] | 268 | return -ENOMEM; |
| 269 | |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 270 | /* let the kset specific function add its keys */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 271 | retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 272 | if (retval) |
| 273 | goto out; |
| 274 | |
| 275 | /* copy keys to file */ |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 276 | for (i = 0; i < env->envp_idx; i++) |
| 277 | count += sprintf(&buf[count], "%s\n", env->envp[i]); |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 278 | out: |
Kay Sievers | 7eff2e7 | 2007-08-14 15:15:12 +0200 | [diff] [blame] | 279 | kfree(env); |
Kay Sievers | 16574dc | 2007-04-06 01:40:38 +0200 | [diff] [blame] | 280 | return count; |
| 281 | } |
| 282 | |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 283 | static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, |
| 284 | const char *buf, size_t count) |
| 285 | { |
Kay Sievers | 60a96a5 | 2007-07-08 22:29:26 +0200 | [diff] [blame] | 286 | enum kobject_action action; |
| 287 | |
Kay Sievers | 5c5daf6 | 2007-08-12 20:43:55 +0200 | [diff] [blame] | 288 | if (kobject_action_type(buf, count, &action) == 0) { |
Kay Sievers | 60a96a5 | 2007-07-08 22:29:26 +0200 | [diff] [blame] | 289 | kobject_uevent(&dev->kobj, action); |
| 290 | goto out; |
| 291 | } |
| 292 | |
| 293 | dev_err(dev, "uevent: unsupported action-string; this will " |
| 294 | "be ignored in a future kernel version\n"); |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 295 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
Kay Sievers | 60a96a5 | 2007-07-08 22:29:26 +0200 | [diff] [blame] | 296 | out: |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 297 | return count; |
| 298 | } |
| 299 | |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 300 | static struct device_attribute uevent_attr = |
| 301 | __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); |
| 302 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 303 | static int device_add_attributes(struct device *dev, |
| 304 | struct device_attribute *attrs) |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 305 | { |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 306 | int error = 0; |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 307 | int i; |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 308 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 309 | if (attrs) { |
| 310 | for (i = 0; attr_name(attrs[i]); i++) { |
| 311 | error = device_create_file(dev, &attrs[i]); |
| 312 | if (error) |
| 313 | break; |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 314 | } |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 315 | if (error) |
| 316 | while (--i >= 0) |
| 317 | device_remove_file(dev, &attrs[i]); |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 318 | } |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 319 | return error; |
| 320 | } |
| 321 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 322 | static void device_remove_attributes(struct device *dev, |
| 323 | struct device_attribute *attrs) |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 324 | { |
| 325 | int i; |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 326 | |
| 327 | if (attrs) |
| 328 | for (i = 0; attr_name(attrs[i]); i++) |
| 329 | device_remove_file(dev, &attrs[i]); |
| 330 | } |
| 331 | |
| 332 | static int device_add_groups(struct device *dev, |
| 333 | struct attribute_group **groups) |
| 334 | { |
| 335 | int error = 0; |
| 336 | int i; |
| 337 | |
| 338 | if (groups) { |
| 339 | for (i = 0; groups[i]; i++) { |
| 340 | error = sysfs_create_group(&dev->kobj, groups[i]); |
| 341 | if (error) { |
| 342 | while (--i >= 0) |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 343 | sysfs_remove_group(&dev->kobj, |
| 344 | groups[i]); |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 345 | break; |
| 346 | } |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 347 | } |
| 348 | } |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 349 | return error; |
| 350 | } |
| 351 | |
| 352 | static void device_remove_groups(struct device *dev, |
| 353 | struct attribute_group **groups) |
| 354 | { |
| 355 | int i; |
| 356 | |
| 357 | if (groups) |
| 358 | for (i = 0; groups[i]; i++) |
| 359 | sysfs_remove_group(&dev->kobj, groups[i]); |
Greg Kroah-Hartman | de0ff00 | 2006-06-27 00:06:09 -0700 | [diff] [blame] | 360 | } |
| 361 | |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 362 | static int device_add_attrs(struct device *dev) |
| 363 | { |
| 364 | struct class *class = dev->class; |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 365 | struct device_type *type = dev->type; |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 366 | int error; |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 367 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 368 | if (class) { |
| 369 | error = device_add_attributes(dev, class->dev_attrs); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 370 | if (error) |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 371 | return error; |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 372 | } |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 373 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 374 | if (type) { |
| 375 | error = device_add_groups(dev, type->groups); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 376 | if (error) |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 377 | goto err_remove_class_attrs; |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 378 | } |
| 379 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 380 | error = device_add_groups(dev, dev->groups); |
| 381 | if (error) |
| 382 | goto err_remove_type_groups; |
| 383 | |
| 384 | return 0; |
| 385 | |
| 386 | err_remove_type_groups: |
| 387 | if (type) |
| 388 | device_remove_groups(dev, type->groups); |
| 389 | err_remove_class_attrs: |
| 390 | if (class) |
| 391 | device_remove_attributes(dev, class->dev_attrs); |
| 392 | |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 393 | return error; |
| 394 | } |
| 395 | |
| 396 | static void device_remove_attrs(struct device *dev) |
| 397 | { |
| 398 | struct class *class = dev->class; |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 399 | struct device_type *type = dev->type; |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 400 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 401 | device_remove_groups(dev, dev->groups); |
Kay Sievers | f9f852d | 2006-10-07 21:54:55 +0200 | [diff] [blame] | 402 | |
Dmitry Torokhov | 621a167 | 2007-03-10 01:37:34 -0500 | [diff] [blame] | 403 | if (type) |
| 404 | device_remove_groups(dev, type->groups); |
| 405 | |
| 406 | if (class) |
| 407 | device_remove_attributes(dev, class->dev_attrs); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 408 | } |
| 409 | |
| 410 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 411 | static ssize_t show_dev(struct device *dev, struct device_attribute *attr, |
| 412 | char *buf) |
| 413 | { |
| 414 | return print_dev_t(buf, dev->devt); |
| 415 | } |
| 416 | |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 417 | static struct device_attribute devt_attr = |
| 418 | __ATTR(dev, S_IRUGO, show_dev, NULL); |
| 419 | |
Greg Kroah-Hartman | 881c6cf | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 420 | /* kset to create /sys/devices/ */ |
| 421 | struct kset *devices_kset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 424 | * device_create_file - create sysfs attribute file for device. |
| 425 | * @dev: device. |
| 426 | * @attr: device attribute descriptor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 428 | int device_create_file(struct device *dev, struct device_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | { |
| 430 | int error = 0; |
Cornelia Huck | 0c98b19 | 2008-01-31 10:39:38 +0100 | [diff] [blame] | 431 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | error = sysfs_create_file(&dev->kobj, &attr->attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | return error; |
| 434 | } |
| 435 | |
| 436 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 437 | * device_remove_file - remove sysfs attribute file. |
| 438 | * @dev: device. |
| 439 | * @attr: device attribute descriptor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 441 | void device_remove_file(struct device *dev, struct device_attribute *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | { |
Cornelia Huck | 0c98b19 | 2008-01-31 10:39:38 +0100 | [diff] [blame] | 443 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | sysfs_remove_file(&dev->kobj, &attr->attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | } |
| 446 | |
Greg Kroah-Hartman | 2589f188 | 2006-09-19 09:39:19 -0700 | [diff] [blame] | 447 | /** |
| 448 | * device_create_bin_file - create sysfs binary attribute file for device. |
| 449 | * @dev: device. |
| 450 | * @attr: device binary attribute descriptor. |
| 451 | */ |
| 452 | int device_create_bin_file(struct device *dev, struct bin_attribute *attr) |
| 453 | { |
| 454 | int error = -EINVAL; |
| 455 | if (dev) |
| 456 | error = sysfs_create_bin_file(&dev->kobj, attr); |
| 457 | return error; |
| 458 | } |
| 459 | EXPORT_SYMBOL_GPL(device_create_bin_file); |
| 460 | |
| 461 | /** |
| 462 | * device_remove_bin_file - remove sysfs binary attribute file |
| 463 | * @dev: device. |
| 464 | * @attr: device binary attribute descriptor. |
| 465 | */ |
| 466 | void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) |
| 467 | { |
| 468 | if (dev) |
| 469 | sysfs_remove_bin_file(&dev->kobj, attr); |
| 470 | } |
| 471 | EXPORT_SYMBOL_GPL(device_remove_bin_file); |
| 472 | |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 473 | /** |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 474 | * device_schedule_callback_owner - helper to schedule a callback for a device |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 475 | * @dev: device. |
| 476 | * @func: callback function to invoke later. |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 477 | * @owner: module owning the callback routine |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 478 | * |
| 479 | * Attribute methods must not unregister themselves or their parent device |
| 480 | * (which would amount to the same thing). Attempts to do so will deadlock, |
| 481 | * since unregistration is mutually exclusive with driver callbacks. |
| 482 | * |
| 483 | * Instead methods can call this routine, which will attempt to allocate |
| 484 | * and schedule a workqueue request to call back @func with @dev as its |
| 485 | * argument in the workqueue's process context. @dev will be pinned until |
| 486 | * @func returns. |
| 487 | * |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 488 | * This routine is usually called via the inline device_schedule_callback(), |
| 489 | * which automatically sets @owner to THIS_MODULE. |
| 490 | * |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 491 | * Returns 0 if the request was submitted, -ENOMEM if storage could not |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 492 | * be allocated, -ENODEV if a reference to @owner isn't available. |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 493 | * |
| 494 | * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an |
| 495 | * underlying sysfs routine (since it is intended for use by attribute |
| 496 | * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. |
| 497 | */ |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 498 | int device_schedule_callback_owner(struct device *dev, |
| 499 | void (*func)(struct device *), struct module *owner) |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 500 | { |
| 501 | return sysfs_schedule_callback(&dev->kobj, |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 502 | (void (*)(void *)) func, dev, owner); |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 503 | } |
Alan Stern | 523ded7 | 2007-04-26 00:12:04 -0700 | [diff] [blame] | 504 | EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
Alan Stern | d9a9cdf | 2007-03-15 15:50:34 -0400 | [diff] [blame] | 505 | |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 506 | static void klist_children_get(struct klist_node *n) |
| 507 | { |
| 508 | struct device *dev = container_of(n, struct device, knode_parent); |
| 509 | |
| 510 | get_device(dev); |
| 511 | } |
| 512 | |
| 513 | static void klist_children_put(struct klist_node *n) |
| 514 | { |
| 515 | struct device *dev = container_of(n, struct device, knode_parent); |
| 516 | |
| 517 | put_device(dev); |
| 518 | } |
| 519 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 521 | * device_initialize - init device structure. |
| 522 | * @dev: device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 524 | * This prepares the device for use by other layers, |
| 525 | * including adding it to the device hierarchy. |
| 526 | * It is the first half of device_register(), if called by |
| 527 | * that, though it can also be called separately, so one |
| 528 | * may use @dev's fields (e.g. the refcount). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | void device_initialize(struct device *dev) |
| 531 | { |
Greg Kroah-Hartman | 881c6cf | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 532 | dev->kobj.kset = devices_kset; |
Greg Kroah-Hartman | f9cb074 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 533 | kobject_init(&dev->kobj, &device_ktype); |
James Bottomley | 34bb61f | 2005-09-06 16:56:51 -0700 | [diff] [blame] | 534 | klist_init(&dev->klist_children, klist_children_get, |
| 535 | klist_children_put); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | INIT_LIST_HEAD(&dev->dma_pools); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 537 | INIT_LIST_HEAD(&dev->node); |
mochel@digitalimplant.org | af70316 | 2005-03-21 10:41:04 -0800 | [diff] [blame] | 538 | init_MUTEX(&dev->sem); |
Tejun Heo | 9ac7849 | 2007-01-20 16:00:26 +0900 | [diff] [blame] | 539 | spin_lock_init(&dev->devres_lock); |
| 540 | INIT_LIST_HEAD(&dev->devres_head); |
David Brownell | 0ac8524 | 2005-09-12 19:39:34 -0700 | [diff] [blame] | 541 | device_init_wakeup(dev, 0); |
Christoph Hellwig | 8734813 | 2006-12-06 20:32:33 -0800 | [diff] [blame] | 542 | set_dev_node(dev, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | } |
| 544 | |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 545 | #ifdef CONFIG_SYSFS_DEPRECATED |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 546 | static struct kobject *get_device_parent(struct device *dev, |
| 547 | struct device *parent) |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 548 | { |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 549 | /* class devices without a parent live in /sys/class/<classname>/ */ |
Dmitry Torokhov | 3eb215d | 2007-10-07 12:22:21 -0400 | [diff] [blame] | 550 | if (dev->class && (!parent || parent->class != dev->class)) |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 551 | return &dev->class->subsys.kobj; |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 552 | /* all other devices keep their parent */ |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 553 | else if (parent) |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 554 | return &parent->kobj; |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 555 | |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 556 | return NULL; |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 557 | } |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 558 | |
| 559 | static inline void cleanup_device_parent(struct device *dev) {} |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 560 | static inline void cleanup_glue_dir(struct device *dev, |
| 561 | struct kobject *glue_dir) {} |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 562 | #else |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 563 | static struct kobject *virtual_device_parent(struct device *dev) |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 564 | { |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 565 | static struct kobject *virtual_dir = NULL; |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 566 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 567 | if (!virtual_dir) |
Greg Kroah-Hartman | 4ff6abf | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 568 | virtual_dir = kobject_create_and_add("virtual", |
Greg Kroah-Hartman | 881c6cf | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 569 | &devices_kset->kobj); |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 570 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 571 | return virtual_dir; |
Greg Kroah-Hartman | f0ee61a | 2006-10-23 10:40:54 -0700 | [diff] [blame] | 572 | } |
| 573 | |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 574 | static struct kobject *get_device_parent(struct device *dev, |
| 575 | struct device *parent) |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 576 | { |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 577 | int retval; |
| 578 | |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 579 | if (dev->class) { |
| 580 | struct kobject *kobj = NULL; |
| 581 | struct kobject *parent_kobj; |
| 582 | struct kobject *k; |
| 583 | |
| 584 | /* |
| 585 | * If we have no parent, we live in "virtual". |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 586 | * Class-devices with a non class-device as parent, live |
| 587 | * in a "glue" directory to prevent namespace collisions. |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 588 | */ |
| 589 | if (parent == NULL) |
| 590 | parent_kobj = virtual_device_parent(dev); |
| 591 | else if (parent->class) |
| 592 | return &parent->kobj; |
| 593 | else |
| 594 | parent_kobj = &parent->kobj; |
| 595 | |
| 596 | /* find our class-directory at the parent and reference it */ |
| 597 | spin_lock(&dev->class->class_dirs.list_lock); |
| 598 | list_for_each_entry(k, &dev->class->class_dirs.list, entry) |
| 599 | if (k->parent == parent_kobj) { |
| 600 | kobj = kobject_get(k); |
| 601 | break; |
| 602 | } |
| 603 | spin_unlock(&dev->class->class_dirs.list_lock); |
| 604 | if (kobj) |
| 605 | return kobj; |
| 606 | |
| 607 | /* or create a new class-directory at the parent device */ |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 608 | k = kobject_create(); |
| 609 | if (!k) |
| 610 | return NULL; |
| 611 | k->kset = &dev->class->class_dirs; |
Greg Kroah-Hartman | b2d6db5 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 612 | retval = kobject_add(k, parent_kobj, "%s", dev->class->name); |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 613 | if (retval < 0) { |
| 614 | kobject_put(k); |
| 615 | return NULL; |
| 616 | } |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 617 | /* do not emit an uevent for this simple "glue" directory */ |
Greg Kroah-Hartman | 43968d2 | 2007-11-05 22:24:43 -0800 | [diff] [blame] | 618 | return k; |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | if (parent) |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 622 | return &parent->kobj; |
| 623 | return NULL; |
| 624 | } |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 625 | |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 626 | static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 627 | { |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 628 | /* see if we live in a "glue" directory */ |
Cornelia Huck | c1fe539 | 2008-02-27 15:38:23 +0100 | [diff] [blame] | 629 | if (!glue_dir || !dev->class || |
| 630 | glue_dir->kset != &dev->class->class_dirs) |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 631 | return; |
| 632 | |
Kay Sievers | 0f4dafc | 2007-12-19 01:40:42 +0100 | [diff] [blame] | 633 | kobject_put(glue_dir); |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 634 | } |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 635 | |
| 636 | static void cleanup_device_parent(struct device *dev) |
| 637 | { |
| 638 | cleanup_glue_dir(dev, dev->kobj.parent); |
| 639 | } |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 640 | #endif |
Kay Sievers | 8640624 | 2007-03-14 03:25:56 +0100 | [diff] [blame] | 641 | |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 642 | static void setup_parent(struct device *dev, struct device *parent) |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 643 | { |
| 644 | struct kobject *kobj; |
| 645 | kobj = get_device_parent(dev, parent); |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 646 | if (kobj) |
| 647 | dev->kobj.parent = kobj; |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 648 | } |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 649 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 650 | static int device_add_class_symlinks(struct device *dev) |
| 651 | { |
| 652 | int error; |
| 653 | |
| 654 | if (!dev->class) |
| 655 | return 0; |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 656 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 657 | error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, |
| 658 | "subsystem"); |
| 659 | if (error) |
| 660 | goto out; |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 661 | |
| 662 | #ifdef CONFIG_SYSFS_DEPRECATED |
| 663 | /* stacked class devices need a symlink in the class directory */ |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 664 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 665 | device_is_not_partition(dev)) { |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 666 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
| 667 | dev->bus_id); |
| 668 | if (error) |
| 669 | goto out_subsys; |
| 670 | } |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 671 | |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 672 | if (dev->parent && device_is_not_partition(dev)) { |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 673 | struct device *parent = dev->parent; |
| 674 | char *class_name; |
Dmitry Torokhov | 4f01a75 | 2007-09-18 22:46:50 -0700 | [diff] [blame] | 675 | |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 676 | /* |
| 677 | * stacked class devices have the 'device' link |
| 678 | * pointing to the bus device instead of the parent |
| 679 | */ |
| 680 | while (parent->class && !parent->bus && parent->parent) |
| 681 | parent = parent->parent; |
Dmitry Torokhov | 4f01a75 | 2007-09-18 22:46:50 -0700 | [diff] [blame] | 682 | |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 683 | error = sysfs_create_link(&dev->kobj, |
| 684 | &parent->kobj, |
| 685 | "device"); |
| 686 | if (error) |
| 687 | goto out_busid; |
Dmitry Torokhov | 4f01a75 | 2007-09-18 22:46:50 -0700 | [diff] [blame] | 688 | |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 689 | class_name = make_class_name(dev->class->name, |
| 690 | &dev->kobj); |
| 691 | if (class_name) |
| 692 | error = sysfs_create_link(&dev->parent->kobj, |
| 693 | &dev->kobj, class_name); |
| 694 | kfree(class_name); |
| 695 | if (error) |
| 696 | goto out_device; |
| 697 | } |
| 698 | return 0; |
| 699 | |
| 700 | out_device: |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 701 | if (dev->parent && device_is_not_partition(dev)) |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 702 | sysfs_remove_link(&dev->kobj, "device"); |
| 703 | out_busid: |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 704 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 705 | device_is_not_partition(dev)) |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 706 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
Dmitry Torokhov | 4f01a75 | 2007-09-18 22:46:50 -0700 | [diff] [blame] | 707 | #else |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 708 | /* link in the class directory pointing to the device */ |
| 709 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
| 710 | dev->bus_id); |
| 711 | if (error) |
| 712 | goto out_subsys; |
| 713 | |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 714 | if (dev->parent && device_is_not_partition(dev)) { |
Dmitry Torokhov | 4f01a75 | 2007-09-18 22:46:50 -0700 | [diff] [blame] | 715 | error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
| 716 | "device"); |
| 717 | if (error) |
| 718 | goto out_busid; |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 719 | } |
| 720 | return 0; |
| 721 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 722 | out_busid: |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 723 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
| 724 | #endif |
| 725 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 726 | out_subsys: |
| 727 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 728 | out: |
| 729 | return error; |
| 730 | } |
| 731 | |
| 732 | static void device_remove_class_symlinks(struct device *dev) |
| 733 | { |
| 734 | if (!dev->class) |
| 735 | return; |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 736 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 737 | #ifdef CONFIG_SYSFS_DEPRECATED |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 738 | if (dev->parent && device_is_not_partition(dev)) { |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 739 | char *class_name; |
| 740 | |
| 741 | class_name = make_class_name(dev->class->name, &dev->kobj); |
| 742 | if (class_name) { |
| 743 | sysfs_remove_link(&dev->parent->kobj, class_name); |
| 744 | kfree(class_name); |
| 745 | } |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 746 | sysfs_remove_link(&dev->kobj, "device"); |
| 747 | } |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 748 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 749 | if (dev->kobj.parent != &dev->class->subsys.kobj && |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 750 | device_is_not_partition(dev)) |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 751 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 752 | #else |
Greg Kroah-Hartman | 4e886c2 | 2008-01-27 12:12:43 -0800 | [diff] [blame] | 753 | if (dev->parent && device_is_not_partition(dev)) |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 754 | sysfs_remove_link(&dev->kobj, "device"); |
| 755 | |
| 756 | sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); |
| 757 | #endif |
| 758 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 759 | sysfs_remove_link(&dev->kobj, "subsystem"); |
| 760 | } |
| 761 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 763 | * device_add - add device to device hierarchy. |
| 764 | * @dev: device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 766 | * This is part 2 of device_register(), though may be called |
| 767 | * separately _iff_ device_initialize() has been called separately. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 769 | * This adds it to the kobject hierarchy via kobject_add(), adds it |
| 770 | * to the global and sibling lists for the device, then |
| 771 | * adds it to the other relevant subsystems of the driver model. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | */ |
| 773 | int device_add(struct device *dev) |
| 774 | { |
| 775 | struct device *parent = NULL; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 776 | struct class_interface *class_intf; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 777 | int error; |
| 778 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | dev = get_device(dev); |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 780 | if (!dev || !strlen(dev->bus_id)) { |
| 781 | error = -EINVAL; |
Cornelia Huck | c1fe539 | 2008-02-27 15:38:23 +0100 | [diff] [blame] | 782 | goto Done; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 783 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 785 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
Greg Kroah-Hartman | c205ef4 | 2006-08-07 22:19:37 -0700 | [diff] [blame] | 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | parent = get_device(dev->parent); |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 788 | setup_parent(dev, parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
Yinghai Lu | 0d358f2 | 2008-02-19 03:20:41 -0800 | [diff] [blame] | 790 | /* use parent numa_node */ |
| 791 | if (parent) |
| 792 | set_dev_node(dev, dev_to_node(parent)); |
| 793 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | /* first, register with generic layer. */ |
Greg Kroah-Hartman | b2d6db5 | 2007-12-17 23:05:35 -0700 | [diff] [blame] | 795 | error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); |
Greg Kroah-Hartman | 40fa542 | 2006-10-24 00:37:58 +0100 | [diff] [blame] | 796 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | goto Error; |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 798 | |
Brian Walsh | 3702264 | 2006-08-14 22:43:19 -0700 | [diff] [blame] | 799 | /* notify platform of device entry */ |
| 800 | if (platform_notify) |
| 801 | platform_notify(dev); |
| 802 | |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 803 | /* notify clients of device entry (new way) */ |
| 804 | if (dev->bus) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 805 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 806 | BUS_NOTIFY_ADD_DEVICE, dev); |
| 807 | |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 808 | error = device_create_file(dev, &uevent_attr); |
Cornelia Huck | a306eea | 2006-09-22 11:37:13 +0200 | [diff] [blame] | 809 | if (error) |
| 810 | goto attrError; |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 811 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 812 | if (MAJOR(dev->devt)) { |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 813 | error = device_create_file(dev, &devt_attr); |
| 814 | if (error) |
Cornelia Huck | a306eea | 2006-09-22 11:37:13 +0200 | [diff] [blame] | 815 | goto ueventattrError; |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 816 | } |
| 817 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 818 | error = device_add_class_symlinks(dev); |
| 819 | if (error) |
| 820 | goto SymlinkError; |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 821 | error = device_add_attrs(dev); |
| 822 | if (error) |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 823 | goto AttrsError; |
Cornelia Huck | dc0afa8 | 2007-07-09 11:39:18 -0700 | [diff] [blame] | 824 | error = bus_add_device(dev); |
| 825 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | goto BusError; |
Rafael J. Wysocki | 57eee3d | 2008-03-12 00:59:38 +0100 | [diff] [blame] | 827 | error = device_pm_add(dev); |
| 828 | if (error) |
| 829 | goto PMError; |
Cornelia Huck | 83b5fb4c | 2007-03-29 11:12:11 +0200 | [diff] [blame] | 830 | kobject_uevent(&dev->kobj, KOBJ_ADD); |
Cornelia Huck | c6a4669 | 2007-02-05 16:15:26 -0800 | [diff] [blame] | 831 | bus_attach_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | if (parent) |
James Bottomley | d856f1e | 2005-08-19 09:14:01 -0400 | [diff] [blame] | 833 | klist_add_tail(&dev->knode_parent, &parent->klist_children); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 835 | if (dev->class) { |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 836 | down(&dev->class->sem); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 837 | /* tie the class to the device */ |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 838 | list_add_tail(&dev->node, &dev->class->devices); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 839 | |
| 840 | /* notify any interfaces that the device is here */ |
| 841 | list_for_each_entry(class_intf, &dev->class->interfaces, node) |
| 842 | if (class_intf->add_dev) |
| 843 | class_intf->add_dev(dev, class_intf); |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 844 | up(&dev->class->sem); |
| 845 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | Done: |
| 847 | put_device(dev); |
| 848 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | PMError: |
Rafael J. Wysocki | 57eee3d | 2008-03-12 00:59:38 +0100 | [diff] [blame] | 850 | bus_remove_device(dev); |
| 851 | BusError: |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 852 | if (dev->bus) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 853 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 854 | BUS_NOTIFY_DEL_DEVICE, dev); |
James Simmons | 82f0cf9 | 2007-02-21 17:44:51 +0000 | [diff] [blame] | 855 | device_remove_attrs(dev); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 856 | AttrsError: |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 857 | device_remove_class_symlinks(dev); |
| 858 | SymlinkError: |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 859 | if (MAJOR(dev->devt)) |
| 860 | device_remove_file(dev, &devt_attr); |
Cornelia Huck | a306eea | 2006-09-22 11:37:13 +0200 | [diff] [blame] | 861 | ueventattrError: |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 862 | device_remove_file(dev, &uevent_attr); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 863 | attrError: |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 864 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | kobject_del(&dev->kobj); |
| 866 | Error: |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 867 | cleanup_device_parent(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | if (parent) |
| 869 | put_device(parent); |
| 870 | goto Done; |
| 871 | } |
| 872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 874 | * device_register - register a device with the system. |
| 875 | * @dev: pointer to the device structure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 877 | * This happens in two clean steps - initialize the device |
| 878 | * and add it to the system. The two steps can be called |
| 879 | * separately, but this is the easiest and most common. |
| 880 | * I.e. you should only call the two helpers separately if |
| 881 | * have a clearly defined need to use and refcount the device |
| 882 | * before it is added to the hierarchy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | int device_register(struct device *dev) |
| 885 | { |
| 886 | device_initialize(dev); |
| 887 | return device_add(dev); |
| 888 | } |
| 889 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 891 | * get_device - increment reference count for device. |
| 892 | * @dev: device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 894 | * This simply forwards the call to kobject_get(), though |
| 895 | * we do take care to provide for the case that we get a NULL |
| 896 | * pointer passed in. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 898 | struct device *get_device(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | { |
| 900 | return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; |
| 901 | } |
| 902 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 904 | * put_device - decrement reference count. |
| 905 | * @dev: device in question. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 907 | void put_device(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 909 | /* might_sleep(); */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | if (dev) |
| 911 | kobject_put(&dev->kobj); |
| 912 | } |
| 913 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 915 | * device_del - delete device from system. |
| 916 | * @dev: device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 918 | * This is the first part of the device unregistration |
| 919 | * sequence. This removes the device from the lists we control |
| 920 | * from here, has it removed from the other driver model |
| 921 | * subsystems it was added to in device_add(), and removes it |
| 922 | * from the kobject hierarchy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 924 | * NOTE: this should be called manually _iff_ device_add() was |
| 925 | * also called manually. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 927 | void device_del(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 929 | struct device *parent = dev->parent; |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 930 | struct class_interface *class_intf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 932 | device_pm_remove(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | if (parent) |
Patrick Mochel | d62c0f9 | 2005-06-24 08:39:33 -0700 | [diff] [blame] | 934 | klist_del(&dev->knode_parent); |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 935 | if (MAJOR(dev->devt)) |
| 936 | device_remove_file(dev, &devt_attr); |
Kay Sievers | b9d9c82 | 2006-06-15 15:31:56 +0200 | [diff] [blame] | 937 | if (dev->class) { |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 938 | device_remove_class_symlinks(dev); |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 939 | |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 940 | down(&dev->class->sem); |
Greg Kroah-Hartman | c47ed21 | 2006-09-13 15:34:05 +0200 | [diff] [blame] | 941 | /* notify any interfaces that the device is now gone */ |
| 942 | list_for_each_entry(class_intf, &dev->class->interfaces, node) |
| 943 | if (class_intf->remove_dev) |
| 944 | class_intf->remove_dev(dev, class_intf); |
| 945 | /* remove the device from the class list */ |
Greg Kroah-Hartman | 5d9fd16 | 2006-06-22 17:17:32 -0700 | [diff] [blame] | 946 | list_del_init(&dev->node); |
| 947 | up(&dev->class->sem); |
Kay Sievers | b9d9c82 | 2006-06-15 15:31:56 +0200 | [diff] [blame] | 948 | } |
Tejun Heo | ad6a1e1 | 2007-06-14 03:45:17 +0900 | [diff] [blame] | 949 | device_remove_file(dev, &uevent_attr); |
Greg Kroah-Hartman | 2620efe | 2006-06-28 16:19:58 -0700 | [diff] [blame] | 950 | device_remove_attrs(dev); |
Benjamin Herrenschmidt | 2895353 | 2006-11-08 19:46:14 -0800 | [diff] [blame] | 951 | bus_remove_device(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | |
Tejun Heo | 2f8d16a | 2007-03-09 19:34:19 +0900 | [diff] [blame] | 953 | /* |
| 954 | * Some platform devices are driven without driver attached |
| 955 | * and managed resources may have been acquired. Make sure |
| 956 | * all resources are released. |
| 957 | */ |
| 958 | devres_release_all(dev); |
| 959 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | /* Notify the platform of the removal, in case they |
| 961 | * need to do anything... |
| 962 | */ |
| 963 | if (platform_notify_remove) |
| 964 | platform_notify_remove(dev); |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 965 | if (dev->bus) |
Greg Kroah-Hartman | c6f7e72 | 2007-11-01 19:41:16 -0700 | [diff] [blame] | 966 | blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
Benjamin Herrenschmidt | 116af37 | 2006-10-25 13:44:59 +1000 | [diff] [blame] | 967 | BUS_NOTIFY_DEL_DEVICE, dev); |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 968 | kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 969 | cleanup_device_parent(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | kobject_del(&dev->kobj); |
Kay Sievers | da231fd | 2007-11-21 17:29:15 +0100 | [diff] [blame] | 971 | put_device(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | } |
| 973 | |
| 974 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 975 | * device_unregister - unregister device from system. |
| 976 | * @dev: device going away. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 978 | * We do this in two parts, like we do device_register(). First, |
| 979 | * we remove it from all the subsystems with device_del(), then |
| 980 | * we decrement the reference count via put_device(). If that |
| 981 | * is the final reference count, the device will be cleaned up |
| 982 | * via device_release() above. Otherwise, the structure will |
| 983 | * stick around until the final reference to the device is dropped. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 985 | void device_unregister(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | { |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 987 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | device_del(dev); |
| 989 | put_device(dev); |
| 990 | } |
| 991 | |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 992 | static struct device *next_device(struct klist_iter *i) |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 993 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 994 | struct klist_node *n = klist_next(i); |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 995 | return n ? container_of(n, struct device, knode_parent) : NULL; |
| 996 | } |
| 997 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | /** |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 999 | * device_for_each_child - device child iterator. |
| 1000 | * @parent: parent struct device. |
| 1001 | * @data: data for the callback. |
| 1002 | * @fn: function to be called for each device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1004 | * Iterate over @parent's child devices, and call @fn for each, |
| 1005 | * passing it @data. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | * |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1007 | * We check the return of @fn each time. If it returns anything |
| 1008 | * other than 0, we break out and return that value. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1010 | int device_for_each_child(struct device *parent, void *data, |
| 1011 | int (*fn)(struct device *dev, void *data)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | { |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 1013 | struct klist_iter i; |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1014 | struct device *child; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | int error = 0; |
| 1016 | |
mochel@digitalimplant.org | 3623957 | 2005-03-24 19:08:30 -0800 | [diff] [blame] | 1017 | klist_iter_init(&parent->klist_children, &i); |
| 1018 | while ((child = next_device(&i)) && !error) |
| 1019 | error = fn(child, data); |
| 1020 | klist_iter_exit(&i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | return error; |
| 1022 | } |
| 1023 | |
Cornelia Huck | 5ab6998 | 2006-11-16 15:42:07 +0100 | [diff] [blame] | 1024 | /** |
| 1025 | * device_find_child - device iterator for locating a particular device. |
| 1026 | * @parent: parent struct device |
| 1027 | * @data: Data to pass to match function |
| 1028 | * @match: Callback function to check device |
| 1029 | * |
| 1030 | * This is similar to the device_for_each_child() function above, but it |
| 1031 | * returns a reference to a device that is 'found' for later use, as |
| 1032 | * determined by the @match callback. |
| 1033 | * |
| 1034 | * The callback should return 0 if the device doesn't match and non-zero |
| 1035 | * if it does. If the callback returns non-zero and a reference to the |
| 1036 | * current device can be obtained, this function will return to the caller |
| 1037 | * and not iterate over any more devices. |
| 1038 | */ |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1039 | struct device *device_find_child(struct device *parent, void *data, |
| 1040 | int (*match)(struct device *dev, void *data)) |
Cornelia Huck | 5ab6998 | 2006-11-16 15:42:07 +0100 | [diff] [blame] | 1041 | { |
| 1042 | struct klist_iter i; |
| 1043 | struct device *child; |
| 1044 | |
| 1045 | if (!parent) |
| 1046 | return NULL; |
| 1047 | |
| 1048 | klist_iter_init(&parent->klist_children, &i); |
| 1049 | while ((child = next_device(&i))) |
| 1050 | if (match(child, data) && get_device(child)) |
| 1051 | break; |
| 1052 | klist_iter_exit(&i); |
| 1053 | return child; |
| 1054 | } |
| 1055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | int __init devices_init(void) |
| 1057 | { |
Greg Kroah-Hartman | 881c6cf | 2007-11-01 09:29:06 -0600 | [diff] [blame] | 1058 | devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
| 1059 | if (!devices_kset) |
| 1060 | return -ENOMEM; |
| 1061 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } |
| 1063 | |
| 1064 | EXPORT_SYMBOL_GPL(device_for_each_child); |
Cornelia Huck | 5ab6998 | 2006-11-16 15:42:07 +0100 | [diff] [blame] | 1065 | EXPORT_SYMBOL_GPL(device_find_child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | |
| 1067 | EXPORT_SYMBOL_GPL(device_initialize); |
| 1068 | EXPORT_SYMBOL_GPL(device_add); |
| 1069 | EXPORT_SYMBOL_GPL(device_register); |
| 1070 | |
| 1071 | EXPORT_SYMBOL_GPL(device_del); |
| 1072 | EXPORT_SYMBOL_GPL(device_unregister); |
| 1073 | EXPORT_SYMBOL_GPL(get_device); |
| 1074 | EXPORT_SYMBOL_GPL(put_device); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | |
| 1076 | EXPORT_SYMBOL_GPL(device_create_file); |
| 1077 | EXPORT_SYMBOL_GPL(device_remove_file); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1078 | |
| 1079 | |
| 1080 | static void device_create_release(struct device *dev) |
| 1081 | { |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 1082 | pr_debug("device: '%s': %s\n", dev->bus_id, __func__); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1083 | kfree(dev); |
| 1084 | } |
| 1085 | |
| 1086 | /** |
| 1087 | * device_create - creates a device and registers it with sysfs |
Henrik Kretzschmar | 42734da | 2006-07-05 00:53:19 +0200 | [diff] [blame] | 1088 | * @class: pointer to the struct class that this device should be registered to |
| 1089 | * @parent: pointer to the parent struct device of this new device, if any |
| 1090 | * @devt: the dev_t for the char device to be added |
| 1091 | * @fmt: string for the device's name |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1092 | * |
Henrik Kretzschmar | 42734da | 2006-07-05 00:53:19 +0200 | [diff] [blame] | 1093 | * This function can be used by char device classes. A struct device |
| 1094 | * will be created in sysfs, registered to the specified class. |
| 1095 | * |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1096 | * A "dev" file will be created, showing the dev_t for the device, if |
| 1097 | * the dev_t is not 0,0. |
Henrik Kretzschmar | 42734da | 2006-07-05 00:53:19 +0200 | [diff] [blame] | 1098 | * If a pointer to a parent struct device is passed in, the newly created |
| 1099 | * struct device will be a child of that device in sysfs. |
| 1100 | * The pointer to the struct device will be returned from the call. |
| 1101 | * 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] | 1102 | * pointer. |
| 1103 | * |
| 1104 | * Note: the struct class passed to this function must have previously |
| 1105 | * been created with a call to class_create(). |
| 1106 | */ |
| 1107 | struct device *device_create(struct class *class, struct device *parent, |
Greg Kroah-Hartman | 5cbe5f8 | 2006-08-10 01:19:19 -0400 | [diff] [blame] | 1108 | dev_t devt, const char *fmt, ...) |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1109 | { |
| 1110 | va_list args; |
| 1111 | struct device *dev = NULL; |
| 1112 | int retval = -ENODEV; |
| 1113 | |
| 1114 | if (class == NULL || IS_ERR(class)) |
| 1115 | goto error; |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1116 | |
| 1117 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| 1118 | if (!dev) { |
| 1119 | retval = -ENOMEM; |
| 1120 | goto error; |
| 1121 | } |
| 1122 | |
| 1123 | dev->devt = devt; |
| 1124 | dev->class = class; |
| 1125 | dev->parent = parent; |
| 1126 | dev->release = device_create_release; |
| 1127 | |
| 1128 | va_start(args, fmt); |
| 1129 | vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); |
| 1130 | va_end(args); |
| 1131 | retval = device_register(dev); |
| 1132 | if (retval) |
| 1133 | goto error; |
| 1134 | |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1135 | return dev; |
| 1136 | |
| 1137 | error: |
| 1138 | kfree(dev); |
| 1139 | return ERR_PTR(retval); |
| 1140 | } |
| 1141 | EXPORT_SYMBOL_GPL(device_create); |
| 1142 | |
Dave Young | cd35449 | 2008-01-28 16:56:11 +0800 | [diff] [blame] | 1143 | static int __match_devt(struct device *dev, void *data) |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1144 | { |
Dave Young | cd35449 | 2008-01-28 16:56:11 +0800 | [diff] [blame] | 1145 | dev_t *devt = data; |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1146 | |
Dave Young | cd35449 | 2008-01-28 16:56:11 +0800 | [diff] [blame] | 1147 | return dev->devt == *devt; |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1148 | } |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1149 | |
Rafael J. Wysocki | 775b64d | 2008-01-12 20:40:46 +0100 | [diff] [blame] | 1150 | /** |
| 1151 | * device_destroy - removes a device that was created with device_create() |
| 1152 | * @class: pointer to the struct class that this device was registered with |
| 1153 | * @devt: the dev_t of the device that was previously registered |
| 1154 | * |
| 1155 | * This call unregisters and cleans up a device that was created with a |
| 1156 | * call to device_create(). |
| 1157 | */ |
| 1158 | void device_destroy(struct class *class, dev_t devt) |
| 1159 | { |
| 1160 | struct device *dev; |
| 1161 | |
Dave Young | cd35449 | 2008-01-28 16:56:11 +0800 | [diff] [blame] | 1162 | dev = class_find_device(class, &devt, __match_devt); |
| 1163 | if (dev) { |
| 1164 | put_device(dev); |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1165 | device_unregister(dev); |
Dave Young | cd35449 | 2008-01-28 16:56:11 +0800 | [diff] [blame] | 1166 | } |
Greg Kroah-Hartman | 23681e4 | 2006-06-14 12:14:34 -0700 | [diff] [blame] | 1167 | } |
| 1168 | EXPORT_SYMBOL_GPL(device_destroy); |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1169 | |
| 1170 | /** |
| 1171 | * device_rename - renames a device |
| 1172 | * @dev: the pointer to the struct device to be renamed |
| 1173 | * @new_name: the new name of the device |
| 1174 | */ |
| 1175 | int device_rename(struct device *dev, char *new_name) |
| 1176 | { |
| 1177 | char *old_class_name = NULL; |
| 1178 | char *new_class_name = NULL; |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1179 | char *old_device_name = NULL; |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1180 | int error; |
| 1181 | |
| 1182 | dev = get_device(dev); |
| 1183 | if (!dev) |
| 1184 | return -EINVAL; |
| 1185 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 1186 | pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 1187 | __func__, new_name); |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1188 | |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 1189 | #ifdef CONFIG_SYSFS_DEPRECATED |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1190 | if ((dev->class) && (dev->parent)) |
| 1191 | old_class_name = make_class_name(dev->class->name, &dev->kobj); |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 1192 | #endif |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1193 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1194 | old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); |
| 1195 | if (!old_device_name) { |
| 1196 | error = -ENOMEM; |
| 1197 | goto out; |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1198 | } |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1199 | strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1200 | strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); |
| 1201 | |
| 1202 | error = kobject_rename(&dev->kobj, new_name); |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1203 | if (error) { |
| 1204 | strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); |
| 1205 | goto out; |
| 1206 | } |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1207 | |
Kay Sievers | 99ef3ef | 2006-09-14 11:23:28 +0200 | [diff] [blame] | 1208 | #ifdef CONFIG_SYSFS_DEPRECATED |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1209 | if (old_class_name) { |
| 1210 | new_class_name = make_class_name(dev->class->name, &dev->kobj); |
| 1211 | if (new_class_name) { |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1212 | error = sysfs_create_link(&dev->parent->kobj, |
| 1213 | &dev->kobj, new_class_name); |
| 1214 | if (error) |
| 1215 | goto out; |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1216 | sysfs_remove_link(&dev->parent->kobj, old_class_name); |
| 1217 | } |
| 1218 | } |
Kay Sievers | 60b8cab | 2007-10-26 20:07:44 +0200 | [diff] [blame] | 1219 | #else |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1220 | if (dev->class) { |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1221 | sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); |
| 1222 | error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, |
| 1223 | dev->bus_id); |
| 1224 | if (error) { |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1225 | dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 1226 | __func__, error); |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1227 | } |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1228 | } |
Kay Sievers | 60b8cab | 2007-10-26 20:07:44 +0200 | [diff] [blame] | 1229 | #endif |
| 1230 | |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1231 | out: |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1232 | put_device(dev); |
| 1233 | |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1234 | kfree(new_class_name); |
Jesper Juhl | 952ab43 | 2006-09-28 23:56:01 +0200 | [diff] [blame] | 1235 | kfree(old_class_name); |
Cornelia Huck | 2ee97caf | 2007-07-18 01:43:47 -0700 | [diff] [blame] | 1236 | kfree(old_device_name); |
Greg Kroah-Hartman | a2de48c | 2006-07-03 14:31:12 -0700 | [diff] [blame] | 1237 | |
| 1238 | return error; |
| 1239 | } |
Johannes Berg | a2807db | 2007-02-28 12:38:31 +0100 | [diff] [blame] | 1240 | EXPORT_SYMBOL_GPL(device_rename); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1241 | |
| 1242 | static int device_move_class_links(struct device *dev, |
| 1243 | struct device *old_parent, |
| 1244 | struct device *new_parent) |
| 1245 | { |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 1246 | int error = 0; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1247 | #ifdef CONFIG_SYSFS_DEPRECATED |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1248 | char *class_name; |
| 1249 | |
| 1250 | class_name = make_class_name(dev->class->name, &dev->kobj); |
| 1251 | if (!class_name) { |
Cornelia Huck | cb360bb | 2006-11-27 10:35:05 +0100 | [diff] [blame] | 1252 | error = -ENOMEM; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1253 | goto out; |
| 1254 | } |
| 1255 | if (old_parent) { |
| 1256 | sysfs_remove_link(&dev->kobj, "device"); |
| 1257 | sysfs_remove_link(&old_parent->kobj, class_name); |
| 1258 | } |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1259 | if (new_parent) { |
| 1260 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, |
| 1261 | "device"); |
| 1262 | if (error) |
| 1263 | goto out; |
| 1264 | error = sysfs_create_link(&new_parent->kobj, &dev->kobj, |
| 1265 | class_name); |
| 1266 | if (error) |
| 1267 | sysfs_remove_link(&dev->kobj, "device"); |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1268 | } else |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1269 | error = 0; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1270 | out: |
| 1271 | kfree(class_name); |
| 1272 | return error; |
| 1273 | #else |
Greg Kroah-Hartman | f7f3461 | 2007-03-06 12:55:53 -0800 | [diff] [blame] | 1274 | if (old_parent) |
| 1275 | sysfs_remove_link(&dev->kobj, "device"); |
| 1276 | if (new_parent) |
| 1277 | error = sysfs_create_link(&dev->kobj, &new_parent->kobj, |
| 1278 | "device"); |
| 1279 | return error; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1280 | #endif |
| 1281 | } |
| 1282 | |
| 1283 | /** |
| 1284 | * device_move - moves a device to a new parent |
| 1285 | * @dev: the pointer to the struct device to be moved |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1286 | * @new_parent: the new parent of the device (can by NULL) |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1287 | */ |
| 1288 | int device_move(struct device *dev, struct device *new_parent) |
| 1289 | { |
| 1290 | int error; |
| 1291 | struct device *old_parent; |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1292 | struct kobject *new_parent_kobj; |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1293 | |
| 1294 | dev = get_device(dev); |
| 1295 | if (!dev) |
| 1296 | return -EINVAL; |
| 1297 | |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1298 | new_parent = get_device(new_parent); |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1299 | new_parent_kobj = get_device_parent(dev, new_parent); |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 1300 | |
Greg Kroah-Hartman | 7dc72b2 | 2007-11-28 23:49:41 -0800 | [diff] [blame] | 1301 | pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, |
Harvey Harrison | 2b3a302 | 2008-03-04 16:41:05 -0800 | [diff] [blame] | 1302 | __func__, new_parent ? new_parent->bus_id : "<NULL>"); |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1303 | error = kobject_move(&dev->kobj, new_parent_kobj); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1304 | if (error) { |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 1305 | cleanup_glue_dir(dev, new_parent_kobj); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1306 | put_device(new_parent); |
| 1307 | goto out; |
| 1308 | } |
| 1309 | old_parent = dev->parent; |
| 1310 | dev->parent = new_parent; |
| 1311 | if (old_parent) |
Cornelia Huck | acf02d2 | 2006-11-22 17:49:39 +0100 | [diff] [blame] | 1312 | klist_remove(&dev->knode_parent); |
Yinghai Lu | 0d358f2 | 2008-02-19 03:20:41 -0800 | [diff] [blame] | 1313 | if (new_parent) { |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1314 | klist_add_tail(&dev->knode_parent, &new_parent->klist_children); |
Yinghai Lu | 0d358f2 | 2008-02-19 03:20:41 -0800 | [diff] [blame] | 1315 | set_dev_node(dev, dev_to_node(new_parent)); |
| 1316 | } |
| 1317 | |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1318 | if (!dev->class) |
| 1319 | goto out_put; |
| 1320 | error = device_move_class_links(dev, old_parent, new_parent); |
| 1321 | if (error) { |
| 1322 | /* We ignore errors on cleanup since we're hosed anyway... */ |
| 1323 | device_move_class_links(dev, new_parent, old_parent); |
| 1324 | if (!kobject_move(&dev->kobj, &old_parent->kobj)) { |
Cornelia Huck | c744aea | 2007-01-08 20:16:44 +0100 | [diff] [blame] | 1325 | if (new_parent) |
| 1326 | klist_remove(&dev->knode_parent); |
Yinghai Lu | 0d358f2 | 2008-02-19 03:20:41 -0800 | [diff] [blame] | 1327 | dev->parent = old_parent; |
| 1328 | if (old_parent) { |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1329 | klist_add_tail(&dev->knode_parent, |
| 1330 | &old_parent->klist_children); |
Yinghai Lu | 0d358f2 | 2008-02-19 03:20:41 -0800 | [diff] [blame] | 1331 | set_dev_node(dev, dev_to_node(old_parent)); |
| 1332 | } |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1333 | } |
Cornelia Huck | 63b6971 | 2008-01-21 16:09:44 +0100 | [diff] [blame] | 1334 | cleanup_glue_dir(dev, new_parent_kobj); |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1335 | put_device(new_parent); |
| 1336 | goto out; |
| 1337 | } |
| 1338 | out_put: |
| 1339 | put_device(old_parent); |
| 1340 | out: |
| 1341 | put_device(dev); |
| 1342 | return error; |
| 1343 | } |
Cornelia Huck | 8a82472 | 2006-11-20 17:07:51 +0100 | [diff] [blame] | 1344 | EXPORT_SYMBOL_GPL(device_move); |
Greg Kroah-Hartman | 37b0c02 | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 1345 | |
| 1346 | /** |
| 1347 | * device_shutdown - call ->shutdown() on each device to shutdown. |
| 1348 | */ |
| 1349 | void device_shutdown(void) |
| 1350 | { |
Greg Kroah-Hartman | 4a3ad20 | 2008-01-24 22:50:12 -0800 | [diff] [blame] | 1351 | struct device *dev, *devn; |
Greg Kroah-Hartman | 37b0c02 | 2007-11-26 22:11:55 -0800 | [diff] [blame] | 1352 | |
| 1353 | list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, |
| 1354 | kobj.entry) { |
| 1355 | if (dev->bus && dev->bus->shutdown) { |
| 1356 | dev_dbg(dev, "shutdown\n"); |
| 1357 | dev->bus->shutdown(dev); |
| 1358 | } else if (dev->driver && dev->driver->shutdown) { |
| 1359 | dev_dbg(dev, "shutdown\n"); |
| 1360 | dev->driver->shutdown(dev); |
| 1361 | } |
| 1362 | } |
| 1363 | } |