11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * drivers/base/core.c - core driver model code (device registration, etc) 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (c) 2002-3 Patrick Mochel 51da177e4SLinus Torvalds * Copyright (c) 2002-3 Open Source Development Labs 664bb5d2cSGreg Kroah-Hartman * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> 764bb5d2cSGreg Kroah-Hartman * Copyright (c) 2006 Novell, Inc. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * This file is released under the GPLv2 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds */ 121da177e4SLinus Torvalds 131da177e4SLinus Torvalds #include <linux/device.h> 141da177e4SLinus Torvalds #include <linux/err.h> 151da177e4SLinus Torvalds #include <linux/init.h> 161da177e4SLinus Torvalds #include <linux/module.h> 171da177e4SLinus Torvalds #include <linux/slab.h> 181da177e4SLinus Torvalds #include <linux/string.h> 1923681e47SGreg Kroah-Hartman #include <linux/kdev_t.h> 20116af378SBenjamin Herrenschmidt #include <linux/notifier.h> 21da231fd5SKay Sievers #include <linux/genhd.h> 22815d2d50SAndrew Morton #include <linux/kallsyms.h> 236188e10dSMatthew Wilcox #include <linux/semaphore.h> 24f75b1c60SDave Young #include <linux/mutex.h> 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #include "base.h" 271da177e4SLinus Torvalds #include "power/power.h" 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds int (*platform_notify)(struct device *dev) = NULL; 301da177e4SLinus Torvalds int (*platform_notify_remove)(struct device *dev) = NULL; 31e105b8bfSDan Williams static struct kobject *dev_kobj; 32e105b8bfSDan Williams struct kobject *sysfs_dev_char_kobj; 33e105b8bfSDan Williams struct kobject *sysfs_dev_block_kobj; 341da177e4SLinus Torvalds 354e886c29SGreg Kroah-Hartman #ifdef CONFIG_BLOCK 364e886c29SGreg Kroah-Hartman static inline int device_is_not_partition(struct device *dev) 374e886c29SGreg Kroah-Hartman { 384e886c29SGreg Kroah-Hartman return !(dev->type == &part_type); 394e886c29SGreg Kroah-Hartman } 404e886c29SGreg Kroah-Hartman #else 414e886c29SGreg Kroah-Hartman static inline int device_is_not_partition(struct device *dev) 424e886c29SGreg Kroah-Hartman { 434e886c29SGreg Kroah-Hartman return 1; 444e886c29SGreg Kroah-Hartman } 454e886c29SGreg Kroah-Hartman #endif 461da177e4SLinus Torvalds 473e95637aSAlan Stern /** 483e95637aSAlan Stern * dev_driver_string - Return a device's driver name, if at all possible 493e95637aSAlan Stern * @dev: struct device to get the name of 503e95637aSAlan Stern * 513e95637aSAlan Stern * Will return the device's driver's name if it is bound to a device. If 523e95637aSAlan Stern * the device is not bound to a device, it will return the name of the bus 533e95637aSAlan Stern * it is attached to. If it is not attached to a bus either, an empty 543e95637aSAlan Stern * string will be returned. 553e95637aSAlan Stern */ 56bf9ca69fSJean Delvare const char *dev_driver_string(const struct device *dev) 573e95637aSAlan Stern { 583e95637aSAlan Stern return dev->driver ? dev->driver->name : 59a456b702SJean Delvare (dev->bus ? dev->bus->name : 60a456b702SJean Delvare (dev->class ? dev->class->name : "")); 613e95637aSAlan Stern } 62310a922dSMatthew Wilcox EXPORT_SYMBOL(dev_driver_string); 633e95637aSAlan Stern 641da177e4SLinus Torvalds #define to_dev(obj) container_of(obj, struct device, kobj) 651da177e4SLinus Torvalds #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) 661da177e4SLinus Torvalds 674a3ad20cSGreg Kroah-Hartman static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, 684a3ad20cSGreg Kroah-Hartman char *buf) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds struct device_attribute *dev_attr = to_dev_attr(attr); 711da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 724a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds if (dev_attr->show) 7554b6f35cSYani Ioannou ret = dev_attr->show(dev, dev_attr, buf); 76815d2d50SAndrew Morton if (ret >= (ssize_t)PAGE_SIZE) { 77815d2d50SAndrew Morton print_symbol("dev_attr_show: %s returned bad count\n", 78815d2d50SAndrew Morton (unsigned long)dev_attr->show); 79815d2d50SAndrew Morton } 801da177e4SLinus Torvalds return ret; 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds 834a3ad20cSGreg Kroah-Hartman static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, 841da177e4SLinus Torvalds const char *buf, size_t count) 851da177e4SLinus Torvalds { 861da177e4SLinus Torvalds struct device_attribute *dev_attr = to_dev_attr(attr); 871da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 884a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds if (dev_attr->store) 9154b6f35cSYani Ioannou ret = dev_attr->store(dev, dev_attr, buf, count); 921da177e4SLinus Torvalds return ret; 931da177e4SLinus Torvalds } 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds static struct sysfs_ops dev_sysfs_ops = { 961da177e4SLinus Torvalds .show = dev_attr_show, 971da177e4SLinus Torvalds .store = dev_attr_store, 981da177e4SLinus Torvalds }; 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds /** 1021da177e4SLinus Torvalds * device_release - free device structure. 1031da177e4SLinus Torvalds * @kobj: device's kobject. 1041da177e4SLinus Torvalds * 1051da177e4SLinus Torvalds * This is called once the reference count for the object 1061da177e4SLinus Torvalds * reaches 0. We forward the call to the device's release 1071da177e4SLinus Torvalds * method, which should handle actually freeing the structure. 1081da177e4SLinus Torvalds */ 1091da177e4SLinus Torvalds static void device_release(struct kobject *kobj) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 112fb069a5dSGreg Kroah-Hartman struct device_private *p = dev->p; 1131da177e4SLinus Torvalds 1141da177e4SLinus Torvalds if (dev->release) 1151da177e4SLinus Torvalds dev->release(dev); 116f9f852dfSKay Sievers else if (dev->type && dev->type->release) 117f9f852dfSKay Sievers dev->type->release(dev); 1182620efefSGreg Kroah-Hartman else if (dev->class && dev->class->dev_release) 1192620efefSGreg Kroah-Hartman dev->class->dev_release(dev); 120f810a5cfSArjan van de Ven else 121f810a5cfSArjan van de Ven WARN(1, KERN_ERR "Device '%s' does not have a release() " 1224a3ad20cSGreg Kroah-Hartman "function, it is broken and must be fixed.\n", 1231e0b2cf9SKay Sievers dev_name(dev)); 124fb069a5dSGreg Kroah-Hartman kfree(p); 1251da177e4SLinus Torvalds } 1261da177e4SLinus Torvalds 1278f4afc41SGreg Kroah-Hartman static struct kobj_type device_ktype = { 1281da177e4SLinus Torvalds .release = device_release, 1291da177e4SLinus Torvalds .sysfs_ops = &dev_sysfs_ops, 1301da177e4SLinus Torvalds }; 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvalds 133312c004dSKay Sievers static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds struct kobj_type *ktype = get_ktype(kobj); 1361da177e4SLinus Torvalds 1378f4afc41SGreg Kroah-Hartman if (ktype == &device_ktype) { 1381da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1391da177e4SLinus Torvalds if (dev->bus) 1401da177e4SLinus Torvalds return 1; 14123681e47SGreg Kroah-Hartman if (dev->class) 14223681e47SGreg Kroah-Hartman return 1; 1431da177e4SLinus Torvalds } 1441da177e4SLinus Torvalds return 0; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds 147312c004dSKay Sievers static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) 1481da177e4SLinus Torvalds { 1491da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1501da177e4SLinus Torvalds 15123681e47SGreg Kroah-Hartman if (dev->bus) 1521da177e4SLinus Torvalds return dev->bus->name; 15323681e47SGreg Kroah-Hartman if (dev->class) 15423681e47SGreg Kroah-Hartman return dev->class->name; 15523681e47SGreg Kroah-Hartman return NULL; 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds 1587eff2e7aSKay Sievers static int dev_uevent(struct kset *kset, struct kobject *kobj, 1597eff2e7aSKay Sievers struct kobj_uevent_env *env) 1601da177e4SLinus Torvalds { 1611da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1621da177e4SLinus Torvalds int retval = 0; 1631da177e4SLinus Torvalds 16423681e47SGreg Kroah-Hartman /* add the major/minor if present */ 16523681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 1667eff2e7aSKay Sievers add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); 1677eff2e7aSKay Sievers add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); 16823681e47SGreg Kroah-Hartman } 16923681e47SGreg Kroah-Hartman 170414264f9SKay Sievers if (dev->type && dev->type->name) 1717eff2e7aSKay Sievers add_uevent_var(env, "DEVTYPE=%s", dev->type->name); 172414264f9SKay Sievers 173239378f1SKay Sievers if (dev->driver) 1747eff2e7aSKay Sievers add_uevent_var(env, "DRIVER=%s", dev->driver->name); 175239378f1SKay Sievers 176a87cb2acSKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 177239378f1SKay Sievers if (dev->class) { 178239378f1SKay Sievers struct device *parent = dev->parent; 179239378f1SKay Sievers 180239378f1SKay Sievers /* find first bus device in parent chain */ 181239378f1SKay Sievers while (parent && !parent->bus) 182239378f1SKay Sievers parent = parent->parent; 183239378f1SKay Sievers if (parent && parent->bus) { 184239378f1SKay Sievers const char *path; 185239378f1SKay Sievers 186239378f1SKay Sievers path = kobject_get_path(&parent->kobj, GFP_KERNEL); 1872c7afd12SKay Sievers if (path) { 1887eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVPATH=%s", path); 189239378f1SKay Sievers kfree(path); 1902c7afd12SKay Sievers } 191239378f1SKay Sievers 1927eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); 193239378f1SKay Sievers 194239378f1SKay Sievers if (parent->driver) 1957eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVDRIVER=%s", 1967eff2e7aSKay Sievers parent->driver->name); 197239378f1SKay Sievers } 198239378f1SKay Sievers } else if (dev->bus) { 1997eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); 200239378f1SKay Sievers 201239378f1SKay Sievers if (dev->driver) 2024a3ad20cSGreg Kroah-Hartman add_uevent_var(env, "PHYSDEVDRIVER=%s", 2034a3ad20cSGreg Kroah-Hartman dev->driver->name); 204d81d9d6bSKay Sievers } 205239378f1SKay Sievers #endif 2061da177e4SLinus Torvalds 2071da177e4SLinus Torvalds /* have the bus specific function add its stuff */ 2087eff2e7aSKay Sievers if (dev->bus && dev->bus->uevent) { 2097eff2e7aSKay Sievers retval = dev->bus->uevent(dev, env); 210f9f852dfSKay Sievers if (retval) 2117dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: bus uevent() returned %d\n", 2121e0b2cf9SKay Sievers dev_name(dev), __func__, retval); 2131da177e4SLinus Torvalds } 2141da177e4SLinus Torvalds 2152620efefSGreg Kroah-Hartman /* have the class specific function add its stuff */ 2167eff2e7aSKay Sievers if (dev->class && dev->class->dev_uevent) { 2177eff2e7aSKay Sievers retval = dev->class->dev_uevent(dev, env); 218f9f852dfSKay Sievers if (retval) 2197dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: class uevent() " 2201e0b2cf9SKay Sievers "returned %d\n", dev_name(dev), 2212b3a302aSHarvey Harrison __func__, retval); 2222620efefSGreg Kroah-Hartman } 223f9f852dfSKay Sievers 224f9f852dfSKay Sievers /* have the device type specific fuction add its stuff */ 2257eff2e7aSKay Sievers if (dev->type && dev->type->uevent) { 2267eff2e7aSKay Sievers retval = dev->type->uevent(dev, env); 227f9f852dfSKay Sievers if (retval) 2287dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: dev_type uevent() " 2291e0b2cf9SKay Sievers "returned %d\n", dev_name(dev), 2302b3a302aSHarvey Harrison __func__, retval); 2312620efefSGreg Kroah-Hartman } 2322620efefSGreg Kroah-Hartman 2331da177e4SLinus Torvalds return retval; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 236312c004dSKay Sievers static struct kset_uevent_ops device_uevent_ops = { 237312c004dSKay Sievers .filter = dev_uevent_filter, 238312c004dSKay Sievers .name = dev_uevent_name, 239312c004dSKay Sievers .uevent = dev_uevent, 2401da177e4SLinus Torvalds }; 2411da177e4SLinus Torvalds 24216574dccSKay Sievers static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, 24316574dccSKay Sievers char *buf) 24416574dccSKay Sievers { 24516574dccSKay Sievers struct kobject *top_kobj; 24616574dccSKay Sievers struct kset *kset; 2477eff2e7aSKay Sievers struct kobj_uevent_env *env = NULL; 24816574dccSKay Sievers int i; 24916574dccSKay Sievers size_t count = 0; 25016574dccSKay Sievers int retval; 25116574dccSKay Sievers 25216574dccSKay Sievers /* search the kset, the device belongs to */ 25316574dccSKay Sievers top_kobj = &dev->kobj; 2545c5daf65SKay Sievers while (!top_kobj->kset && top_kobj->parent) 25516574dccSKay Sievers top_kobj = top_kobj->parent; 25616574dccSKay Sievers if (!top_kobj->kset) 25716574dccSKay Sievers goto out; 2585c5daf65SKay Sievers 25916574dccSKay Sievers kset = top_kobj->kset; 26016574dccSKay Sievers if (!kset->uevent_ops || !kset->uevent_ops->uevent) 26116574dccSKay Sievers goto out; 26216574dccSKay Sievers 26316574dccSKay Sievers /* respect filter */ 26416574dccSKay Sievers if (kset->uevent_ops && kset->uevent_ops->filter) 26516574dccSKay Sievers if (!kset->uevent_ops->filter(kset, &dev->kobj)) 26616574dccSKay Sievers goto out; 26716574dccSKay Sievers 2687eff2e7aSKay Sievers env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 2697eff2e7aSKay Sievers if (!env) 270c7308c81SGreg Kroah-Hartman return -ENOMEM; 271c7308c81SGreg Kroah-Hartman 27216574dccSKay Sievers /* let the kset specific function add its keys */ 2737eff2e7aSKay Sievers retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); 27416574dccSKay Sievers if (retval) 27516574dccSKay Sievers goto out; 27616574dccSKay Sievers 27716574dccSKay Sievers /* copy keys to file */ 2787eff2e7aSKay Sievers for (i = 0; i < env->envp_idx; i++) 2797eff2e7aSKay Sievers count += sprintf(&buf[count], "%s\n", env->envp[i]); 28016574dccSKay Sievers out: 2817eff2e7aSKay Sievers kfree(env); 28216574dccSKay Sievers return count; 28316574dccSKay Sievers } 28416574dccSKay Sievers 285a7fd6706SKay Sievers static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, 286a7fd6706SKay Sievers const char *buf, size_t count) 287a7fd6706SKay Sievers { 28860a96a59SKay Sievers enum kobject_action action; 28960a96a59SKay Sievers 2905c5daf65SKay Sievers if (kobject_action_type(buf, count, &action) == 0) { 29160a96a59SKay Sievers kobject_uevent(&dev->kobj, action); 29260a96a59SKay Sievers goto out; 29360a96a59SKay Sievers } 29460a96a59SKay Sievers 29522af74f3SKay Sievers dev_err(dev, "uevent: unsupported action-string; this will " 29660a96a59SKay Sievers "be ignored in a future kernel version\n"); 297312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 29860a96a59SKay Sievers out: 299a7fd6706SKay Sievers return count; 300a7fd6706SKay Sievers } 301a7fd6706SKay Sievers 302ad6a1e1cSTejun Heo static struct device_attribute uevent_attr = 303ad6a1e1cSTejun Heo __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); 304ad6a1e1cSTejun Heo 305621a1672SDmitry Torokhov static int device_add_attributes(struct device *dev, 306621a1672SDmitry Torokhov struct device_attribute *attrs) 307de0ff00dSGreg Kroah-Hartman { 308de0ff00dSGreg Kroah-Hartman int error = 0; 309621a1672SDmitry Torokhov int i; 310de0ff00dSGreg Kroah-Hartman 311621a1672SDmitry Torokhov if (attrs) { 312621a1672SDmitry Torokhov for (i = 0; attr_name(attrs[i]); i++) { 313621a1672SDmitry Torokhov error = device_create_file(dev, &attrs[i]); 314621a1672SDmitry Torokhov if (error) 315621a1672SDmitry Torokhov break; 316621a1672SDmitry Torokhov } 317621a1672SDmitry Torokhov if (error) 318de0ff00dSGreg Kroah-Hartman while (--i >= 0) 319621a1672SDmitry Torokhov device_remove_file(dev, &attrs[i]); 320de0ff00dSGreg Kroah-Hartman } 321de0ff00dSGreg Kroah-Hartman return error; 322de0ff00dSGreg Kroah-Hartman } 323de0ff00dSGreg Kroah-Hartman 324621a1672SDmitry Torokhov static void device_remove_attributes(struct device *dev, 325621a1672SDmitry Torokhov struct device_attribute *attrs) 326de0ff00dSGreg Kroah-Hartman { 327de0ff00dSGreg Kroah-Hartman int i; 328621a1672SDmitry Torokhov 329621a1672SDmitry Torokhov if (attrs) 330621a1672SDmitry Torokhov for (i = 0; attr_name(attrs[i]); i++) 331621a1672SDmitry Torokhov device_remove_file(dev, &attrs[i]); 332621a1672SDmitry Torokhov } 333621a1672SDmitry Torokhov 334621a1672SDmitry Torokhov static int device_add_groups(struct device *dev, 335621a1672SDmitry Torokhov struct attribute_group **groups) 336621a1672SDmitry Torokhov { 337621a1672SDmitry Torokhov int error = 0; 338621a1672SDmitry Torokhov int i; 339621a1672SDmitry Torokhov 340621a1672SDmitry Torokhov if (groups) { 341621a1672SDmitry Torokhov for (i = 0; groups[i]; i++) { 342621a1672SDmitry Torokhov error = sysfs_create_group(&dev->kobj, groups[i]); 343621a1672SDmitry Torokhov if (error) { 344621a1672SDmitry Torokhov while (--i >= 0) 3454a3ad20cSGreg Kroah-Hartman sysfs_remove_group(&dev->kobj, 3464a3ad20cSGreg Kroah-Hartman groups[i]); 347621a1672SDmitry Torokhov break; 348de0ff00dSGreg Kroah-Hartman } 349de0ff00dSGreg Kroah-Hartman } 350de0ff00dSGreg Kroah-Hartman } 351621a1672SDmitry Torokhov return error; 352621a1672SDmitry Torokhov } 353621a1672SDmitry Torokhov 354621a1672SDmitry Torokhov static void device_remove_groups(struct device *dev, 355621a1672SDmitry Torokhov struct attribute_group **groups) 356621a1672SDmitry Torokhov { 357621a1672SDmitry Torokhov int i; 358621a1672SDmitry Torokhov 359621a1672SDmitry Torokhov if (groups) 360621a1672SDmitry Torokhov for (i = 0; groups[i]; i++) 361621a1672SDmitry Torokhov sysfs_remove_group(&dev->kobj, groups[i]); 362621a1672SDmitry Torokhov } 363de0ff00dSGreg Kroah-Hartman 3642620efefSGreg Kroah-Hartman static int device_add_attrs(struct device *dev) 3652620efefSGreg Kroah-Hartman { 3662620efefSGreg Kroah-Hartman struct class *class = dev->class; 367f9f852dfSKay Sievers struct device_type *type = dev->type; 368621a1672SDmitry Torokhov int error; 3692620efefSGreg Kroah-Hartman 370621a1672SDmitry Torokhov if (class) { 371621a1672SDmitry Torokhov error = device_add_attributes(dev, class->dev_attrs); 3722620efefSGreg Kroah-Hartman if (error) 373621a1672SDmitry Torokhov return error; 374f9f852dfSKay Sievers } 375f9f852dfSKay Sievers 376621a1672SDmitry Torokhov if (type) { 377621a1672SDmitry Torokhov error = device_add_groups(dev, type->groups); 378f9f852dfSKay Sievers if (error) 379621a1672SDmitry Torokhov goto err_remove_class_attrs; 380f9f852dfSKay Sievers } 381621a1672SDmitry Torokhov 382621a1672SDmitry Torokhov error = device_add_groups(dev, dev->groups); 383f9f852dfSKay Sievers if (error) 384621a1672SDmitry Torokhov goto err_remove_type_groups; 385621a1672SDmitry Torokhov 386621a1672SDmitry Torokhov return 0; 387621a1672SDmitry Torokhov 388621a1672SDmitry Torokhov err_remove_type_groups: 389621a1672SDmitry Torokhov if (type) 390621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 391621a1672SDmitry Torokhov err_remove_class_attrs: 392621a1672SDmitry Torokhov if (class) 393621a1672SDmitry Torokhov device_remove_attributes(dev, class->dev_attrs); 394f9f852dfSKay Sievers 3952620efefSGreg Kroah-Hartman return error; 3962620efefSGreg Kroah-Hartman } 3972620efefSGreg Kroah-Hartman 3982620efefSGreg Kroah-Hartman static void device_remove_attrs(struct device *dev) 3992620efefSGreg Kroah-Hartman { 4002620efefSGreg Kroah-Hartman struct class *class = dev->class; 401f9f852dfSKay Sievers struct device_type *type = dev->type; 4022620efefSGreg Kroah-Hartman 403621a1672SDmitry Torokhov device_remove_groups(dev, dev->groups); 404f9f852dfSKay Sievers 405621a1672SDmitry Torokhov if (type) 406621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 407621a1672SDmitry Torokhov 408621a1672SDmitry Torokhov if (class) 409621a1672SDmitry Torokhov device_remove_attributes(dev, class->dev_attrs); 4102620efefSGreg Kroah-Hartman } 4112620efefSGreg Kroah-Hartman 4122620efefSGreg Kroah-Hartman 41323681e47SGreg Kroah-Hartman static ssize_t show_dev(struct device *dev, struct device_attribute *attr, 41423681e47SGreg Kroah-Hartman char *buf) 41523681e47SGreg Kroah-Hartman { 41623681e47SGreg Kroah-Hartman return print_dev_t(buf, dev->devt); 41723681e47SGreg Kroah-Hartman } 41823681e47SGreg Kroah-Hartman 419ad6a1e1cSTejun Heo static struct device_attribute devt_attr = 420ad6a1e1cSTejun Heo __ATTR(dev, S_IRUGO, show_dev, NULL); 421ad6a1e1cSTejun Heo 422881c6cfdSGreg Kroah-Hartman /* kset to create /sys/devices/ */ 423881c6cfdSGreg Kroah-Hartman struct kset *devices_kset; 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds /** 4261da177e4SLinus Torvalds * device_create_file - create sysfs attribute file for device. 4271da177e4SLinus Torvalds * @dev: device. 4281da177e4SLinus Torvalds * @attr: device attribute descriptor. 4291da177e4SLinus Torvalds */ 4301da177e4SLinus Torvalds int device_create_file(struct device *dev, struct device_attribute *attr) 4311da177e4SLinus Torvalds { 4321da177e4SLinus Torvalds int error = 0; 4330c98b19fSCornelia Huck if (dev) 4341da177e4SLinus Torvalds error = sysfs_create_file(&dev->kobj, &attr->attr); 4351da177e4SLinus Torvalds return error; 4361da177e4SLinus Torvalds } 4371da177e4SLinus Torvalds 4381da177e4SLinus Torvalds /** 4391da177e4SLinus Torvalds * device_remove_file - remove sysfs attribute file. 4401da177e4SLinus Torvalds * @dev: device. 4411da177e4SLinus Torvalds * @attr: device attribute descriptor. 4421da177e4SLinus Torvalds */ 4431da177e4SLinus Torvalds void device_remove_file(struct device *dev, struct device_attribute *attr) 4441da177e4SLinus Torvalds { 4450c98b19fSCornelia Huck if (dev) 4461da177e4SLinus Torvalds sysfs_remove_file(&dev->kobj, &attr->attr); 4471da177e4SLinus Torvalds } 4481da177e4SLinus Torvalds 4492589f188SGreg Kroah-Hartman /** 4502589f188SGreg Kroah-Hartman * device_create_bin_file - create sysfs binary attribute file for device. 4512589f188SGreg Kroah-Hartman * @dev: device. 4522589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 4532589f188SGreg Kroah-Hartman */ 4542589f188SGreg Kroah-Hartman int device_create_bin_file(struct device *dev, struct bin_attribute *attr) 4552589f188SGreg Kroah-Hartman { 4562589f188SGreg Kroah-Hartman int error = -EINVAL; 4572589f188SGreg Kroah-Hartman if (dev) 4582589f188SGreg Kroah-Hartman error = sysfs_create_bin_file(&dev->kobj, attr); 4592589f188SGreg Kroah-Hartman return error; 4602589f188SGreg Kroah-Hartman } 4612589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create_bin_file); 4622589f188SGreg Kroah-Hartman 4632589f188SGreg Kroah-Hartman /** 4642589f188SGreg Kroah-Hartman * device_remove_bin_file - remove sysfs binary attribute file 4652589f188SGreg Kroah-Hartman * @dev: device. 4662589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 4672589f188SGreg Kroah-Hartman */ 4682589f188SGreg Kroah-Hartman void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) 4692589f188SGreg Kroah-Hartman { 4702589f188SGreg Kroah-Hartman if (dev) 4712589f188SGreg Kroah-Hartman sysfs_remove_bin_file(&dev->kobj, attr); 4722589f188SGreg Kroah-Hartman } 4732589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_remove_bin_file); 4742589f188SGreg Kroah-Hartman 475d9a9cdfbSAlan Stern /** 476523ded71SAlan Stern * device_schedule_callback_owner - helper to schedule a callback for a device 477d9a9cdfbSAlan Stern * @dev: device. 478d9a9cdfbSAlan Stern * @func: callback function to invoke later. 479523ded71SAlan Stern * @owner: module owning the callback routine 480d9a9cdfbSAlan Stern * 481d9a9cdfbSAlan Stern * Attribute methods must not unregister themselves or their parent device 482d9a9cdfbSAlan Stern * (which would amount to the same thing). Attempts to do so will deadlock, 483d9a9cdfbSAlan Stern * since unregistration is mutually exclusive with driver callbacks. 484d9a9cdfbSAlan Stern * 485d9a9cdfbSAlan Stern * Instead methods can call this routine, which will attempt to allocate 486d9a9cdfbSAlan Stern * and schedule a workqueue request to call back @func with @dev as its 487d9a9cdfbSAlan Stern * argument in the workqueue's process context. @dev will be pinned until 488d9a9cdfbSAlan Stern * @func returns. 489d9a9cdfbSAlan Stern * 490523ded71SAlan Stern * This routine is usually called via the inline device_schedule_callback(), 491523ded71SAlan Stern * which automatically sets @owner to THIS_MODULE. 492523ded71SAlan Stern * 493d9a9cdfbSAlan Stern * Returns 0 if the request was submitted, -ENOMEM if storage could not 494523ded71SAlan Stern * be allocated, -ENODEV if a reference to @owner isn't available. 495d9a9cdfbSAlan Stern * 496d9a9cdfbSAlan Stern * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an 497d9a9cdfbSAlan Stern * underlying sysfs routine (since it is intended for use by attribute 498d9a9cdfbSAlan Stern * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. 499d9a9cdfbSAlan Stern */ 500523ded71SAlan Stern int device_schedule_callback_owner(struct device *dev, 501523ded71SAlan Stern void (*func)(struct device *), struct module *owner) 502d9a9cdfbSAlan Stern { 503d9a9cdfbSAlan Stern return sysfs_schedule_callback(&dev->kobj, 504523ded71SAlan Stern (void (*)(void *)) func, dev, owner); 505d9a9cdfbSAlan Stern } 506523ded71SAlan Stern EXPORT_SYMBOL_GPL(device_schedule_callback_owner); 507d9a9cdfbSAlan Stern 50834bb61f9SJames Bottomley static void klist_children_get(struct klist_node *n) 50934bb61f9SJames Bottomley { 510f791b8c8SGreg Kroah-Hartman struct device_private *p = to_device_private_parent(n); 511f791b8c8SGreg Kroah-Hartman struct device *dev = p->device; 51234bb61f9SJames Bottomley 51334bb61f9SJames Bottomley get_device(dev); 51434bb61f9SJames Bottomley } 51534bb61f9SJames Bottomley 51634bb61f9SJames Bottomley static void klist_children_put(struct klist_node *n) 51734bb61f9SJames Bottomley { 518f791b8c8SGreg Kroah-Hartman struct device_private *p = to_device_private_parent(n); 519f791b8c8SGreg Kroah-Hartman struct device *dev = p->device; 52034bb61f9SJames Bottomley 52134bb61f9SJames Bottomley put_device(dev); 52234bb61f9SJames Bottomley } 52334bb61f9SJames Bottomley 5241da177e4SLinus Torvalds /** 5251da177e4SLinus Torvalds * device_initialize - init device structure. 5261da177e4SLinus Torvalds * @dev: device. 5271da177e4SLinus Torvalds * 5285739411aSCornelia Huck * This prepares the device for use by other layers by initializing 5295739411aSCornelia Huck * its fields. 5301da177e4SLinus Torvalds * It is the first half of device_register(), if called by 5315739411aSCornelia Huck * that function, though it can also be called separately, so one 5325739411aSCornelia Huck * may use @dev's fields. In particular, get_device()/put_device() 5335739411aSCornelia Huck * may be used for reference counting of @dev after calling this 5345739411aSCornelia Huck * function. 5355739411aSCornelia Huck * 5365739411aSCornelia Huck * NOTE: Use put_device() to give up your reference instead of freeing 5375739411aSCornelia Huck * @dev directly once you have called this function. 5381da177e4SLinus Torvalds */ 5391da177e4SLinus Torvalds void device_initialize(struct device *dev) 5401da177e4SLinus Torvalds { 541881c6cfdSGreg Kroah-Hartman dev->kobj.kset = devices_kset; 542f9cb074bSGreg Kroah-Hartman kobject_init(&dev->kobj, &device_ktype); 5431da177e4SLinus Torvalds INIT_LIST_HEAD(&dev->dma_pools); 544af70316aSmochel@digitalimplant.org init_MUTEX(&dev->sem); 5459ac7849eSTejun Heo spin_lock_init(&dev->devres_lock); 5469ac7849eSTejun Heo INIT_LIST_HEAD(&dev->devres_head); 5470ac85241SDavid Brownell device_init_wakeup(dev, 0); 5483b98aeafSAlan Stern device_pm_init(dev); 54987348136SChristoph Hellwig set_dev_node(dev, -1); 5501da177e4SLinus Torvalds } 5511da177e4SLinus Torvalds 55240fa5422SGreg Kroah-Hartman #ifdef CONFIG_SYSFS_DEPRECATED 553c744aeaeSCornelia Huck static struct kobject *get_device_parent(struct device *dev, 554c744aeaeSCornelia Huck struct device *parent) 55540fa5422SGreg Kroah-Hartman { 556da231fd5SKay Sievers /* class devices without a parent live in /sys/class/<classname>/ */ 5573eb215deSDmitry Torokhov if (dev->class && (!parent || parent->class != dev->class)) 5581fbfee6cSGreg Kroah-Hartman return &dev->class->p->class_subsys.kobj; 559da231fd5SKay Sievers /* all other devices keep their parent */ 56040fa5422SGreg Kroah-Hartman else if (parent) 561c744aeaeSCornelia Huck return &parent->kobj; 56240fa5422SGreg Kroah-Hartman 563c744aeaeSCornelia Huck return NULL; 56440fa5422SGreg Kroah-Hartman } 565da231fd5SKay Sievers 566da231fd5SKay Sievers static inline void cleanup_device_parent(struct device *dev) {} 56763b6971aSCornelia Huck static inline void cleanup_glue_dir(struct device *dev, 56863b6971aSCornelia Huck struct kobject *glue_dir) {} 56940fa5422SGreg Kroah-Hartman #else 570c744aeaeSCornelia Huck static struct kobject *virtual_device_parent(struct device *dev) 571f0ee61a6SGreg Kroah-Hartman { 572f0ee61a6SGreg Kroah-Hartman static struct kobject *virtual_dir = NULL; 573f0ee61a6SGreg Kroah-Hartman 574f0ee61a6SGreg Kroah-Hartman if (!virtual_dir) 5754ff6abffSGreg Kroah-Hartman virtual_dir = kobject_create_and_add("virtual", 576881c6cfdSGreg Kroah-Hartman &devices_kset->kobj); 577f0ee61a6SGreg Kroah-Hartman 57886406245SKay Sievers return virtual_dir; 579f0ee61a6SGreg Kroah-Hartman } 580f0ee61a6SGreg Kroah-Hartman 581c744aeaeSCornelia Huck static struct kobject *get_device_parent(struct device *dev, 582c744aeaeSCornelia Huck struct device *parent) 58340fa5422SGreg Kroah-Hartman { 58443968d2fSGreg Kroah-Hartman int retval; 58543968d2fSGreg Kroah-Hartman 58686406245SKay Sievers if (dev->class) { 58786406245SKay Sievers struct kobject *kobj = NULL; 58886406245SKay Sievers struct kobject *parent_kobj; 58986406245SKay Sievers struct kobject *k; 59086406245SKay Sievers 59186406245SKay Sievers /* 59286406245SKay Sievers * If we have no parent, we live in "virtual". 5930f4dafc0SKay Sievers * Class-devices with a non class-device as parent, live 5940f4dafc0SKay Sievers * in a "glue" directory to prevent namespace collisions. 59586406245SKay Sievers */ 59686406245SKay Sievers if (parent == NULL) 59786406245SKay Sievers parent_kobj = virtual_device_parent(dev); 59886406245SKay Sievers else if (parent->class) 59986406245SKay Sievers return &parent->kobj; 60086406245SKay Sievers else 60186406245SKay Sievers parent_kobj = &parent->kobj; 60286406245SKay Sievers 60386406245SKay Sievers /* find our class-directory at the parent and reference it */ 6047c71448bSGreg Kroah-Hartman spin_lock(&dev->class->p->class_dirs.list_lock); 6057c71448bSGreg Kroah-Hartman list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) 60686406245SKay Sievers if (k->parent == parent_kobj) { 60786406245SKay Sievers kobj = kobject_get(k); 60886406245SKay Sievers break; 60986406245SKay Sievers } 6107c71448bSGreg Kroah-Hartman spin_unlock(&dev->class->p->class_dirs.list_lock); 61186406245SKay Sievers if (kobj) 61286406245SKay Sievers return kobj; 61386406245SKay Sievers 61486406245SKay Sievers /* or create a new class-directory at the parent device */ 61543968d2fSGreg Kroah-Hartman k = kobject_create(); 61643968d2fSGreg Kroah-Hartman if (!k) 61743968d2fSGreg Kroah-Hartman return NULL; 6187c71448bSGreg Kroah-Hartman k->kset = &dev->class->p->class_dirs; 619b2d6db58SGreg Kroah-Hartman retval = kobject_add(k, parent_kobj, "%s", dev->class->name); 62043968d2fSGreg Kroah-Hartman if (retval < 0) { 62143968d2fSGreg Kroah-Hartman kobject_put(k); 62243968d2fSGreg Kroah-Hartman return NULL; 62343968d2fSGreg Kroah-Hartman } 6240f4dafc0SKay Sievers /* do not emit an uevent for this simple "glue" directory */ 62543968d2fSGreg Kroah-Hartman return k; 62686406245SKay Sievers } 62786406245SKay Sievers 62886406245SKay Sievers if (parent) 629c744aeaeSCornelia Huck return &parent->kobj; 630c744aeaeSCornelia Huck return NULL; 631c744aeaeSCornelia Huck } 632da231fd5SKay Sievers 63363b6971aSCornelia Huck static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) 634da231fd5SKay Sievers { 6350f4dafc0SKay Sievers /* see if we live in a "glue" directory */ 636c1fe539aSCornelia Huck if (!glue_dir || !dev->class || 6377c71448bSGreg Kroah-Hartman glue_dir->kset != &dev->class->p->class_dirs) 638da231fd5SKay Sievers return; 639da231fd5SKay Sievers 6400f4dafc0SKay Sievers kobject_put(glue_dir); 641da231fd5SKay Sievers } 64263b6971aSCornelia Huck 64363b6971aSCornelia Huck static void cleanup_device_parent(struct device *dev) 64463b6971aSCornelia Huck { 64563b6971aSCornelia Huck cleanup_glue_dir(dev, dev->kobj.parent); 64663b6971aSCornelia Huck } 647c744aeaeSCornelia Huck #endif 64886406245SKay Sievers 64963b6971aSCornelia Huck static void setup_parent(struct device *dev, struct device *parent) 650c744aeaeSCornelia Huck { 651c744aeaeSCornelia Huck struct kobject *kobj; 652c744aeaeSCornelia Huck kobj = get_device_parent(dev, parent); 653c744aeaeSCornelia Huck if (kobj) 654c744aeaeSCornelia Huck dev->kobj.parent = kobj; 65540fa5422SGreg Kroah-Hartman } 65640fa5422SGreg Kroah-Hartman 6572ee97cafSCornelia Huck static int device_add_class_symlinks(struct device *dev) 6582ee97cafSCornelia Huck { 6592ee97cafSCornelia Huck int error; 6602ee97cafSCornelia Huck 6612ee97cafSCornelia Huck if (!dev->class) 6622ee97cafSCornelia Huck return 0; 663da231fd5SKay Sievers 6641fbfee6cSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, 6651fbfee6cSGreg Kroah-Hartman &dev->class->p->class_subsys.kobj, 6662ee97cafSCornelia Huck "subsystem"); 6672ee97cafSCornelia Huck if (error) 6682ee97cafSCornelia Huck goto out; 669da231fd5SKay Sievers 670da231fd5SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 671da231fd5SKay Sievers /* stacked class devices need a symlink in the class directory */ 6721fbfee6cSGreg Kroah-Hartman if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && 6734e886c29SGreg Kroah-Hartman device_is_not_partition(dev)) { 6741fbfee6cSGreg Kroah-Hartman error = sysfs_create_link(&dev->class->p->class_subsys.kobj, 6751e0b2cf9SKay Sievers &dev->kobj, dev_name(dev)); 6762ee97cafSCornelia Huck if (error) 6772ee97cafSCornelia Huck goto out_subsys; 6782ee97cafSCornelia Huck } 679da231fd5SKay Sievers 6804e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) { 6814f01a757SDmitry Torokhov struct device *parent = dev->parent; 6824f01a757SDmitry Torokhov char *class_name; 6834f01a757SDmitry Torokhov 6844f01a757SDmitry Torokhov /* 685da231fd5SKay Sievers * stacked class devices have the 'device' link 686da231fd5SKay Sievers * pointing to the bus device instead of the parent 6874f01a757SDmitry Torokhov */ 6884f01a757SDmitry Torokhov while (parent->class && !parent->bus && parent->parent) 6894f01a757SDmitry Torokhov parent = parent->parent; 6904f01a757SDmitry Torokhov 6914f01a757SDmitry Torokhov error = sysfs_create_link(&dev->kobj, 6924f01a757SDmitry Torokhov &parent->kobj, 6932ee97cafSCornelia Huck "device"); 6942ee97cafSCornelia Huck if (error) 6952ee97cafSCornelia Huck goto out_busid; 6964f01a757SDmitry Torokhov 6974f01a757SDmitry Torokhov class_name = make_class_name(dev->class->name, 6982ee97cafSCornelia Huck &dev->kobj); 6992ee97cafSCornelia Huck if (class_name) 7002ee97cafSCornelia Huck error = sysfs_create_link(&dev->parent->kobj, 7012ee97cafSCornelia Huck &dev->kobj, class_name); 7022ee97cafSCornelia Huck kfree(class_name); 7032ee97cafSCornelia Huck if (error) 7042ee97cafSCornelia Huck goto out_device; 7052ee97cafSCornelia Huck } 706da231fd5SKay Sievers return 0; 707da231fd5SKay Sievers 708da231fd5SKay Sievers out_device: 7094e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) 710da231fd5SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 711da231fd5SKay Sievers out_busid: 7121fbfee6cSGreg Kroah-Hartman if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && 7134e886c29SGreg Kroah-Hartman device_is_not_partition(dev)) 7141fbfee6cSGreg Kroah-Hartman sysfs_remove_link(&dev->class->p->class_subsys.kobj, 7151e0b2cf9SKay Sievers dev_name(dev)); 7164f01a757SDmitry Torokhov #else 717da231fd5SKay Sievers /* link in the class directory pointing to the device */ 7181fbfee6cSGreg Kroah-Hartman error = sysfs_create_link(&dev->class->p->class_subsys.kobj, 7191e0b2cf9SKay Sievers &dev->kobj, dev_name(dev)); 720da231fd5SKay Sievers if (error) 721da231fd5SKay Sievers goto out_subsys; 722da231fd5SKay Sievers 7234e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) { 7244f01a757SDmitry Torokhov error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, 7254f01a757SDmitry Torokhov "device"); 7264f01a757SDmitry Torokhov if (error) 7274f01a757SDmitry Torokhov goto out_busid; 7282ee97cafSCornelia Huck } 7292ee97cafSCornelia Huck return 0; 7302ee97cafSCornelia Huck 7312ee97cafSCornelia Huck out_busid: 7321e0b2cf9SKay Sievers sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); 733da231fd5SKay Sievers #endif 734da231fd5SKay Sievers 7352ee97cafSCornelia Huck out_subsys: 7362ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 7372ee97cafSCornelia Huck out: 7382ee97cafSCornelia Huck return error; 7392ee97cafSCornelia Huck } 7402ee97cafSCornelia Huck 7412ee97cafSCornelia Huck static void device_remove_class_symlinks(struct device *dev) 7422ee97cafSCornelia Huck { 7432ee97cafSCornelia Huck if (!dev->class) 7442ee97cafSCornelia Huck return; 745da231fd5SKay Sievers 7462ee97cafSCornelia Huck #ifdef CONFIG_SYSFS_DEPRECATED 7474e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) { 7482ee97cafSCornelia Huck char *class_name; 7492ee97cafSCornelia Huck 7502ee97cafSCornelia Huck class_name = make_class_name(dev->class->name, &dev->kobj); 7512ee97cafSCornelia Huck if (class_name) { 7522ee97cafSCornelia Huck sysfs_remove_link(&dev->parent->kobj, class_name); 7532ee97cafSCornelia Huck kfree(class_name); 7542ee97cafSCornelia Huck } 7552ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 7562ee97cafSCornelia Huck } 757da231fd5SKay Sievers 7581fbfee6cSGreg Kroah-Hartman if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && 7594e886c29SGreg Kroah-Hartman device_is_not_partition(dev)) 7601fbfee6cSGreg Kroah-Hartman sysfs_remove_link(&dev->class->p->class_subsys.kobj, 7611e0b2cf9SKay Sievers dev_name(dev)); 762da231fd5SKay Sievers #else 7634e886c29SGreg Kroah-Hartman if (dev->parent && device_is_not_partition(dev)) 764da231fd5SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 765da231fd5SKay Sievers 7661e0b2cf9SKay Sievers sysfs_remove_link(&dev->class->p->class_subsys.kobj, dev_name(dev)); 767da231fd5SKay Sievers #endif 768da231fd5SKay Sievers 7692ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 7702ee97cafSCornelia Huck } 7712ee97cafSCornelia Huck 7721da177e4SLinus Torvalds /** 773413c239fSStephen Rothwell * dev_set_name - set a device name 774413c239fSStephen Rothwell * @dev: device 77546232366SRandy Dunlap * @fmt: format string for the device's name 776413c239fSStephen Rothwell */ 777413c239fSStephen Rothwell int dev_set_name(struct device *dev, const char *fmt, ...) 778413c239fSStephen Rothwell { 779413c239fSStephen Rothwell va_list vargs; 7801fa5ae85SKay Sievers int err; 781413c239fSStephen Rothwell 782413c239fSStephen Rothwell va_start(vargs, fmt); 7831fa5ae85SKay Sievers err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); 784413c239fSStephen Rothwell va_end(vargs); 7851fa5ae85SKay Sievers return err; 786413c239fSStephen Rothwell } 787413c239fSStephen Rothwell EXPORT_SYMBOL_GPL(dev_set_name); 788413c239fSStephen Rothwell 789413c239fSStephen Rothwell /** 790e105b8bfSDan Williams * device_to_dev_kobj - select a /sys/dev/ directory for the device 791e105b8bfSDan Williams * @dev: device 792e105b8bfSDan Williams * 793e105b8bfSDan Williams * By default we select char/ for new entries. Setting class->dev_obj 794e105b8bfSDan Williams * to NULL prevents an entry from being created. class->dev_kobj must 795e105b8bfSDan Williams * be set (or cleared) before any devices are registered to the class 796e105b8bfSDan Williams * otherwise device_create_sys_dev_entry() and 797e105b8bfSDan Williams * device_remove_sys_dev_entry() will disagree about the the presence 798e105b8bfSDan Williams * of the link. 799e105b8bfSDan Williams */ 800e105b8bfSDan Williams static struct kobject *device_to_dev_kobj(struct device *dev) 801e105b8bfSDan Williams { 802e105b8bfSDan Williams struct kobject *kobj; 803e105b8bfSDan Williams 804e105b8bfSDan Williams if (dev->class) 805e105b8bfSDan Williams kobj = dev->class->dev_kobj; 806e105b8bfSDan Williams else 807e105b8bfSDan Williams kobj = sysfs_dev_char_kobj; 808e105b8bfSDan Williams 809e105b8bfSDan Williams return kobj; 810e105b8bfSDan Williams } 811e105b8bfSDan Williams 812e105b8bfSDan Williams static int device_create_sys_dev_entry(struct device *dev) 813e105b8bfSDan Williams { 814e105b8bfSDan Williams struct kobject *kobj = device_to_dev_kobj(dev); 815e105b8bfSDan Williams int error = 0; 816e105b8bfSDan Williams char devt_str[15]; 817e105b8bfSDan Williams 818e105b8bfSDan Williams if (kobj) { 819e105b8bfSDan Williams format_dev_t(devt_str, dev->devt); 820e105b8bfSDan Williams error = sysfs_create_link(kobj, &dev->kobj, devt_str); 821e105b8bfSDan Williams } 822e105b8bfSDan Williams 823e105b8bfSDan Williams return error; 824e105b8bfSDan Williams } 825e105b8bfSDan Williams 826e105b8bfSDan Williams static void device_remove_sys_dev_entry(struct device *dev) 827e105b8bfSDan Williams { 828e105b8bfSDan Williams struct kobject *kobj = device_to_dev_kobj(dev); 829e105b8bfSDan Williams char devt_str[15]; 830e105b8bfSDan Williams 831e105b8bfSDan Williams if (kobj) { 832e105b8bfSDan Williams format_dev_t(devt_str, dev->devt); 833e105b8bfSDan Williams sysfs_remove_link(kobj, devt_str); 834e105b8bfSDan Williams } 835e105b8bfSDan Williams } 836e105b8bfSDan Williams 837e105b8bfSDan Williams /** 8381da177e4SLinus Torvalds * device_add - add device to device hierarchy. 8391da177e4SLinus Torvalds * @dev: device. 8401da177e4SLinus Torvalds * 8411da177e4SLinus Torvalds * This is part 2 of device_register(), though may be called 8421da177e4SLinus Torvalds * separately _iff_ device_initialize() has been called separately. 8431da177e4SLinus Torvalds * 8445739411aSCornelia Huck * This adds @dev to the kobject hierarchy via kobject_add(), adds it 8451da177e4SLinus Torvalds * to the global and sibling lists for the device, then 8461da177e4SLinus Torvalds * adds it to the other relevant subsystems of the driver model. 8475739411aSCornelia Huck * 8485739411aSCornelia Huck * NOTE: _Never_ directly free @dev after calling this function, even 8495739411aSCornelia Huck * if it returned an error! Always use put_device() to give up your 8505739411aSCornelia Huck * reference instead. 8511da177e4SLinus Torvalds */ 8521da177e4SLinus Torvalds int device_add(struct device *dev) 8531da177e4SLinus Torvalds { 8541da177e4SLinus Torvalds struct device *parent = NULL; 855c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 856c906a48aSGreg Kroah-Hartman int error = -EINVAL; 857775b64d2SRafael J. Wysocki 8581da177e4SLinus Torvalds dev = get_device(dev); 859c906a48aSGreg Kroah-Hartman if (!dev) 860c906a48aSGreg Kroah-Hartman goto done; 861c906a48aSGreg Kroah-Hartman 862fb069a5dSGreg Kroah-Hartman dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); 863fb069a5dSGreg Kroah-Hartman if (!dev->p) { 864fb069a5dSGreg Kroah-Hartman error = -ENOMEM; 865fb069a5dSGreg Kroah-Hartman goto done; 866fb069a5dSGreg Kroah-Hartman } 867fb069a5dSGreg Kroah-Hartman dev->p->device = dev; 868f791b8c8SGreg Kroah-Hartman klist_init(&dev->p->klist_children, klist_children_get, 869f791b8c8SGreg Kroah-Hartman klist_children_put); 870fb069a5dSGreg Kroah-Hartman 8711fa5ae85SKay Sievers /* 8721fa5ae85SKay Sievers * for statically allocated devices, which should all be converted 8731fa5ae85SKay Sievers * some day, we need to initialize the name. We prevent reading back 8741fa5ae85SKay Sievers * the name, and force the use of dev_name() 8751fa5ae85SKay Sievers */ 8761fa5ae85SKay Sievers if (dev->init_name) { 8771fa5ae85SKay Sievers dev_set_name(dev, dev->init_name); 8781fa5ae85SKay Sievers dev->init_name = NULL; 8791fa5ae85SKay Sievers } 880c906a48aSGreg Kroah-Hartman 8811fa5ae85SKay Sievers if (!dev_name(dev)) 882c906a48aSGreg Kroah-Hartman goto done; 8831da177e4SLinus Torvalds 8841e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 885c205ef48SGreg Kroah-Hartman 8861da177e4SLinus Torvalds parent = get_device(dev->parent); 88763b6971aSCornelia Huck setup_parent(dev, parent); 8881da177e4SLinus Torvalds 8890d358f22SYinghai Lu /* use parent numa_node */ 8900d358f22SYinghai Lu if (parent) 8910d358f22SYinghai Lu set_dev_node(dev, dev_to_node(parent)); 8920d358f22SYinghai Lu 8931da177e4SLinus Torvalds /* first, register with generic layer. */ 8941e0b2cf9SKay Sievers error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev_name(dev)); 89540fa5422SGreg Kroah-Hartman if (error) 8961da177e4SLinus Torvalds goto Error; 897a7fd6706SKay Sievers 89837022644SBrian Walsh /* notify platform of device entry */ 89937022644SBrian Walsh if (platform_notify) 90037022644SBrian Walsh platform_notify(dev); 90137022644SBrian Walsh 902ad6a1e1cSTejun Heo error = device_create_file(dev, &uevent_attr); 903a306eea4SCornelia Huck if (error) 904a306eea4SCornelia Huck goto attrError; 905a7fd6706SKay Sievers 90623681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 907ad6a1e1cSTejun Heo error = device_create_file(dev, &devt_attr); 908ad6a1e1cSTejun Heo if (error) 909a306eea4SCornelia Huck goto ueventattrError; 910e105b8bfSDan Williams 911e105b8bfSDan Williams error = device_create_sys_dev_entry(dev); 912e105b8bfSDan Williams if (error) 913e105b8bfSDan Williams goto devtattrError; 91423681e47SGreg Kroah-Hartman } 91523681e47SGreg Kroah-Hartman 9162ee97cafSCornelia Huck error = device_add_class_symlinks(dev); 9172ee97cafSCornelia Huck if (error) 9182ee97cafSCornelia Huck goto SymlinkError; 919dc0afa83SCornelia Huck error = device_add_attrs(dev); 920dc0afa83SCornelia Huck if (error) 9212620efefSGreg Kroah-Hartman goto AttrsError; 922dc0afa83SCornelia Huck error = bus_add_device(dev); 923dc0afa83SCornelia Huck if (error) 9241da177e4SLinus Torvalds goto BusError; 9253b98aeafSAlan Stern error = dpm_sysfs_add(dev); 92657eee3d2SRafael J. Wysocki if (error) 9273b98aeafSAlan Stern goto DPMError; 9283b98aeafSAlan Stern device_pm_add(dev); 929ec0676eeSAlan Stern 930ec0676eeSAlan Stern /* Notify clients of device addition. This call must come 931ec0676eeSAlan Stern * after dpm_sysf_add() and before kobject_uevent(). 932ec0676eeSAlan Stern */ 933ec0676eeSAlan Stern if (dev->bus) 934ec0676eeSAlan Stern blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 935ec0676eeSAlan Stern BUS_NOTIFY_ADD_DEVICE, dev); 936ec0676eeSAlan Stern 93753877d06SKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 938c6a46696SCornelia Huck bus_attach_device(dev); 9391da177e4SLinus Torvalds if (parent) 940f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 941f791b8c8SGreg Kroah-Hartman &parent->p->klist_children); 9421da177e4SLinus Torvalds 9435d9fd169SGreg Kroah-Hartman if (dev->class) { 944f75b1c60SDave Young mutex_lock(&dev->class->p->class_mutex); 945c47ed219SGreg Kroah-Hartman /* tie the class to the device */ 9465a3ceb86STejun Heo klist_add_tail(&dev->knode_class, 9475a3ceb86STejun Heo &dev->class->p->class_devices); 948c47ed219SGreg Kroah-Hartman 949c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is here */ 950184f1f77SGreg Kroah-Hartman list_for_each_entry(class_intf, 951184f1f77SGreg Kroah-Hartman &dev->class->p->class_interfaces, node) 952c47ed219SGreg Kroah-Hartman if (class_intf->add_dev) 953c47ed219SGreg Kroah-Hartman class_intf->add_dev(dev, class_intf); 954f75b1c60SDave Young mutex_unlock(&dev->class->p->class_mutex); 9555d9fd169SGreg Kroah-Hartman } 956c906a48aSGreg Kroah-Hartman done: 9571da177e4SLinus Torvalds put_device(dev); 9581da177e4SLinus Torvalds return error; 9593b98aeafSAlan Stern DPMError: 96057eee3d2SRafael J. Wysocki bus_remove_device(dev); 96157eee3d2SRafael J. Wysocki BusError: 9622620efefSGreg Kroah-Hartman device_remove_attrs(dev); 9632620efefSGreg Kroah-Hartman AttrsError: 9642ee97cafSCornelia Huck device_remove_class_symlinks(dev); 9652ee97cafSCornelia Huck SymlinkError: 966ad6a1e1cSTejun Heo if (MAJOR(dev->devt)) 967e105b8bfSDan Williams device_remove_sys_dev_entry(dev); 968e105b8bfSDan Williams devtattrError: 969e105b8bfSDan Williams if (MAJOR(dev->devt)) 970ad6a1e1cSTejun Heo device_remove_file(dev, &devt_attr); 971a306eea4SCornelia Huck ueventattrError: 972ad6a1e1cSTejun Heo device_remove_file(dev, &uevent_attr); 97323681e47SGreg Kroah-Hartman attrError: 974312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 9751da177e4SLinus Torvalds kobject_del(&dev->kobj); 9761da177e4SLinus Torvalds Error: 97763b6971aSCornelia Huck cleanup_device_parent(dev); 9781da177e4SLinus Torvalds if (parent) 9791da177e4SLinus Torvalds put_device(parent); 980c906a48aSGreg Kroah-Hartman goto done; 9811da177e4SLinus Torvalds } 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds /** 9841da177e4SLinus Torvalds * device_register - register a device with the system. 9851da177e4SLinus Torvalds * @dev: pointer to the device structure 9861da177e4SLinus Torvalds * 9871da177e4SLinus Torvalds * This happens in two clean steps - initialize the device 9881da177e4SLinus Torvalds * and add it to the system. The two steps can be called 9891da177e4SLinus Torvalds * separately, but this is the easiest and most common. 9901da177e4SLinus Torvalds * I.e. you should only call the two helpers separately if 9911da177e4SLinus Torvalds * have a clearly defined need to use and refcount the device 9921da177e4SLinus Torvalds * before it is added to the hierarchy. 9935739411aSCornelia Huck * 9945739411aSCornelia Huck * NOTE: _Never_ directly free @dev after calling this function, even 9955739411aSCornelia Huck * if it returned an error! Always use put_device() to give up the 9965739411aSCornelia Huck * reference initialized in this function instead. 9971da177e4SLinus Torvalds */ 9981da177e4SLinus Torvalds int device_register(struct device *dev) 9991da177e4SLinus Torvalds { 10001da177e4SLinus Torvalds device_initialize(dev); 10011da177e4SLinus Torvalds return device_add(dev); 10021da177e4SLinus Torvalds } 10031da177e4SLinus Torvalds 10041da177e4SLinus Torvalds /** 10051da177e4SLinus Torvalds * get_device - increment reference count for device. 10061da177e4SLinus Torvalds * @dev: device. 10071da177e4SLinus Torvalds * 10081da177e4SLinus Torvalds * This simply forwards the call to kobject_get(), though 10091da177e4SLinus Torvalds * we do take care to provide for the case that we get a NULL 10101da177e4SLinus Torvalds * pointer passed in. 10111da177e4SLinus Torvalds */ 10121da177e4SLinus Torvalds struct device *get_device(struct device *dev) 10131da177e4SLinus Torvalds { 10141da177e4SLinus Torvalds return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds 10171da177e4SLinus Torvalds /** 10181da177e4SLinus Torvalds * put_device - decrement reference count. 10191da177e4SLinus Torvalds * @dev: device in question. 10201da177e4SLinus Torvalds */ 10211da177e4SLinus Torvalds void put_device(struct device *dev) 10221da177e4SLinus Torvalds { 1023edfaa7c3SKay Sievers /* might_sleep(); */ 10241da177e4SLinus Torvalds if (dev) 10251da177e4SLinus Torvalds kobject_put(&dev->kobj); 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds 10281da177e4SLinus Torvalds /** 10291da177e4SLinus Torvalds * device_del - delete device from system. 10301da177e4SLinus Torvalds * @dev: device. 10311da177e4SLinus Torvalds * 10321da177e4SLinus Torvalds * This is the first part of the device unregistration 10331da177e4SLinus Torvalds * sequence. This removes the device from the lists we control 10341da177e4SLinus Torvalds * from here, has it removed from the other driver model 10351da177e4SLinus Torvalds * subsystems it was added to in device_add(), and removes it 10361da177e4SLinus Torvalds * from the kobject hierarchy. 10371da177e4SLinus Torvalds * 10381da177e4SLinus Torvalds * NOTE: this should be called manually _iff_ device_add() was 10391da177e4SLinus Torvalds * also called manually. 10401da177e4SLinus Torvalds */ 10411da177e4SLinus Torvalds void device_del(struct device *dev) 10421da177e4SLinus Torvalds { 10431da177e4SLinus Torvalds struct device *parent = dev->parent; 1044c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 10451da177e4SLinus Torvalds 1046ec0676eeSAlan Stern /* Notify clients of device removal. This call must come 1047ec0676eeSAlan Stern * before dpm_sysfs_remove(). 1048ec0676eeSAlan Stern */ 1049ec0676eeSAlan Stern if (dev->bus) 1050ec0676eeSAlan Stern blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 1051ec0676eeSAlan Stern BUS_NOTIFY_DEL_DEVICE, dev); 1052775b64d2SRafael J. Wysocki device_pm_remove(dev); 10533b98aeafSAlan Stern dpm_sysfs_remove(dev); 10541da177e4SLinus Torvalds if (parent) 1055f791b8c8SGreg Kroah-Hartman klist_del(&dev->p->knode_parent); 1056e105b8bfSDan Williams if (MAJOR(dev->devt)) { 1057e105b8bfSDan Williams device_remove_sys_dev_entry(dev); 1058ad6a1e1cSTejun Heo device_remove_file(dev, &devt_attr); 1059e105b8bfSDan Williams } 1060b9d9c82bSKay Sievers if (dev->class) { 1061da231fd5SKay Sievers device_remove_class_symlinks(dev); 106299ef3ef8SKay Sievers 1063f75b1c60SDave Young mutex_lock(&dev->class->p->class_mutex); 1064c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is now gone */ 1065184f1f77SGreg Kroah-Hartman list_for_each_entry(class_intf, 1066184f1f77SGreg Kroah-Hartman &dev->class->p->class_interfaces, node) 1067c47ed219SGreg Kroah-Hartman if (class_intf->remove_dev) 1068c47ed219SGreg Kroah-Hartman class_intf->remove_dev(dev, class_intf); 1069c47ed219SGreg Kroah-Hartman /* remove the device from the class list */ 10705a3ceb86STejun Heo klist_del(&dev->knode_class); 1071f75b1c60SDave Young mutex_unlock(&dev->class->p->class_mutex); 1072b9d9c82bSKay Sievers } 1073ad6a1e1cSTejun Heo device_remove_file(dev, &uevent_attr); 10742620efefSGreg Kroah-Hartman device_remove_attrs(dev); 107528953533SBenjamin Herrenschmidt bus_remove_device(dev); 10761da177e4SLinus Torvalds 10772f8d16a9STejun Heo /* 10782f8d16a9STejun Heo * Some platform devices are driven without driver attached 10792f8d16a9STejun Heo * and managed resources may have been acquired. Make sure 10802f8d16a9STejun Heo * all resources are released. 10812f8d16a9STejun Heo */ 10822f8d16a9STejun Heo devres_release_all(dev); 10832f8d16a9STejun Heo 10841da177e4SLinus Torvalds /* Notify the platform of the removal, in case they 10851da177e4SLinus Torvalds * need to do anything... 10861da177e4SLinus Torvalds */ 10871da177e4SLinus Torvalds if (platform_notify_remove) 10881da177e4SLinus Torvalds platform_notify_remove(dev); 1089312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 1090da231fd5SKay Sievers cleanup_device_parent(dev); 10911da177e4SLinus Torvalds kobject_del(&dev->kobj); 10921da177e4SLinus Torvalds put_device(parent); 10931da177e4SLinus Torvalds } 10941da177e4SLinus Torvalds 10951da177e4SLinus Torvalds /** 10961da177e4SLinus Torvalds * device_unregister - unregister device from system. 10971da177e4SLinus Torvalds * @dev: device going away. 10981da177e4SLinus Torvalds * 10991da177e4SLinus Torvalds * We do this in two parts, like we do device_register(). First, 11001da177e4SLinus Torvalds * we remove it from all the subsystems with device_del(), then 11011da177e4SLinus Torvalds * we decrement the reference count via put_device(). If that 11021da177e4SLinus Torvalds * is the final reference count, the device will be cleaned up 11031da177e4SLinus Torvalds * via device_release() above. Otherwise, the structure will 11041da177e4SLinus Torvalds * stick around until the final reference to the device is dropped. 11051da177e4SLinus Torvalds */ 11061da177e4SLinus Torvalds void device_unregister(struct device *dev) 11071da177e4SLinus Torvalds { 11081e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 11091da177e4SLinus Torvalds device_del(dev); 11101da177e4SLinus Torvalds put_device(dev); 11111da177e4SLinus Torvalds } 11121da177e4SLinus Torvalds 111336239577Smochel@digitalimplant.org static struct device *next_device(struct klist_iter *i) 111436239577Smochel@digitalimplant.org { 111536239577Smochel@digitalimplant.org struct klist_node *n = klist_next(i); 1116f791b8c8SGreg Kroah-Hartman struct device *dev = NULL; 1117f791b8c8SGreg Kroah-Hartman struct device_private *p; 1118f791b8c8SGreg Kroah-Hartman 1119f791b8c8SGreg Kroah-Hartman if (n) { 1120f791b8c8SGreg Kroah-Hartman p = to_device_private_parent(n); 1121f791b8c8SGreg Kroah-Hartman dev = p->device; 1122f791b8c8SGreg Kroah-Hartman } 1123f791b8c8SGreg Kroah-Hartman return dev; 112436239577Smochel@digitalimplant.org } 112536239577Smochel@digitalimplant.org 11261da177e4SLinus Torvalds /** 11271da177e4SLinus Torvalds * device_for_each_child - device child iterator. 1128c41455fbSRandy Dunlap * @parent: parent struct device. 11291da177e4SLinus Torvalds * @data: data for the callback. 11301da177e4SLinus Torvalds * @fn: function to be called for each device. 11311da177e4SLinus Torvalds * 1132c41455fbSRandy Dunlap * Iterate over @parent's child devices, and call @fn for each, 11331da177e4SLinus Torvalds * passing it @data. 11341da177e4SLinus Torvalds * 11351da177e4SLinus Torvalds * We check the return of @fn each time. If it returns anything 11361da177e4SLinus Torvalds * other than 0, we break out and return that value. 11371da177e4SLinus Torvalds */ 113836239577Smochel@digitalimplant.org int device_for_each_child(struct device *parent, void *data, 11394a3ad20cSGreg Kroah-Hartman int (*fn)(struct device *dev, void *data)) 11401da177e4SLinus Torvalds { 114136239577Smochel@digitalimplant.org struct klist_iter i; 11421da177e4SLinus Torvalds struct device *child; 11431da177e4SLinus Torvalds int error = 0; 11441da177e4SLinus Torvalds 1145f791b8c8SGreg Kroah-Hartman klist_iter_init(&parent->p->klist_children, &i); 114636239577Smochel@digitalimplant.org while ((child = next_device(&i)) && !error) 114736239577Smochel@digitalimplant.org error = fn(child, data); 114836239577Smochel@digitalimplant.org klist_iter_exit(&i); 11491da177e4SLinus Torvalds return error; 11501da177e4SLinus Torvalds } 11511da177e4SLinus Torvalds 11525ab69981SCornelia Huck /** 11535ab69981SCornelia Huck * device_find_child - device iterator for locating a particular device. 11545ab69981SCornelia Huck * @parent: parent struct device 11555ab69981SCornelia Huck * @data: Data to pass to match function 11565ab69981SCornelia Huck * @match: Callback function to check device 11575ab69981SCornelia Huck * 11585ab69981SCornelia Huck * This is similar to the device_for_each_child() function above, but it 11595ab69981SCornelia Huck * returns a reference to a device that is 'found' for later use, as 11605ab69981SCornelia Huck * determined by the @match callback. 11615ab69981SCornelia Huck * 11625ab69981SCornelia Huck * The callback should return 0 if the device doesn't match and non-zero 11635ab69981SCornelia Huck * if it does. If the callback returns non-zero and a reference to the 11645ab69981SCornelia Huck * current device can be obtained, this function will return to the caller 11655ab69981SCornelia Huck * and not iterate over any more devices. 11665ab69981SCornelia Huck */ 11675ab69981SCornelia Huck struct device *device_find_child(struct device *parent, void *data, 11684a3ad20cSGreg Kroah-Hartman int (*match)(struct device *dev, void *data)) 11695ab69981SCornelia Huck { 11705ab69981SCornelia Huck struct klist_iter i; 11715ab69981SCornelia Huck struct device *child; 11725ab69981SCornelia Huck 11735ab69981SCornelia Huck if (!parent) 11745ab69981SCornelia Huck return NULL; 11755ab69981SCornelia Huck 1176f791b8c8SGreg Kroah-Hartman klist_iter_init(&parent->p->klist_children, &i); 11775ab69981SCornelia Huck while ((child = next_device(&i))) 11785ab69981SCornelia Huck if (match(child, data) && get_device(child)) 11795ab69981SCornelia Huck break; 11805ab69981SCornelia Huck klist_iter_exit(&i); 11815ab69981SCornelia Huck return child; 11825ab69981SCornelia Huck } 11835ab69981SCornelia Huck 11841da177e4SLinus Torvalds int __init devices_init(void) 11851da177e4SLinus Torvalds { 1186881c6cfdSGreg Kroah-Hartman devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); 1187881c6cfdSGreg Kroah-Hartman if (!devices_kset) 1188881c6cfdSGreg Kroah-Hartman return -ENOMEM; 1189e105b8bfSDan Williams dev_kobj = kobject_create_and_add("dev", NULL); 1190e105b8bfSDan Williams if (!dev_kobj) 1191e105b8bfSDan Williams goto dev_kobj_err; 1192e105b8bfSDan Williams sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); 1193e105b8bfSDan Williams if (!sysfs_dev_block_kobj) 1194e105b8bfSDan Williams goto block_kobj_err; 1195e105b8bfSDan Williams sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); 1196e105b8bfSDan Williams if (!sysfs_dev_char_kobj) 1197e105b8bfSDan Williams goto char_kobj_err; 1198e105b8bfSDan Williams 1199881c6cfdSGreg Kroah-Hartman return 0; 1200e105b8bfSDan Williams 1201e105b8bfSDan Williams char_kobj_err: 1202e105b8bfSDan Williams kobject_put(sysfs_dev_block_kobj); 1203e105b8bfSDan Williams block_kobj_err: 1204e105b8bfSDan Williams kobject_put(dev_kobj); 1205e105b8bfSDan Williams dev_kobj_err: 1206e105b8bfSDan Williams kset_unregister(devices_kset); 1207e105b8bfSDan Williams return -ENOMEM; 12081da177e4SLinus Torvalds } 12091da177e4SLinus Torvalds 12101da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_for_each_child); 12115ab69981SCornelia Huck EXPORT_SYMBOL_GPL(device_find_child); 12121da177e4SLinus Torvalds 12131da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_initialize); 12141da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_add); 12151da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_register); 12161da177e4SLinus Torvalds 12171da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_del); 12181da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_unregister); 12191da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(get_device); 12201da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(put_device); 12211da177e4SLinus Torvalds 12221da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_create_file); 12231da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_remove_file); 122423681e47SGreg Kroah-Hartman 12250aa0dc41SMark McLoughlin struct root_device 12260aa0dc41SMark McLoughlin { 12270aa0dc41SMark McLoughlin struct device dev; 12280aa0dc41SMark McLoughlin struct module *owner; 12290aa0dc41SMark McLoughlin }; 12300aa0dc41SMark McLoughlin 12310aa0dc41SMark McLoughlin #define to_root_device(dev) container_of(dev, struct root_device, dev) 12320aa0dc41SMark McLoughlin 12330aa0dc41SMark McLoughlin static void root_device_release(struct device *dev) 12340aa0dc41SMark McLoughlin { 12350aa0dc41SMark McLoughlin kfree(to_root_device(dev)); 12360aa0dc41SMark McLoughlin } 12370aa0dc41SMark McLoughlin 12380aa0dc41SMark McLoughlin /** 12390aa0dc41SMark McLoughlin * __root_device_register - allocate and register a root device 12400aa0dc41SMark McLoughlin * @name: root device name 12410aa0dc41SMark McLoughlin * @owner: owner module of the root device, usually THIS_MODULE 12420aa0dc41SMark McLoughlin * 12430aa0dc41SMark McLoughlin * This function allocates a root device and registers it 12440aa0dc41SMark McLoughlin * using device_register(). In order to free the returned 12450aa0dc41SMark McLoughlin * device, use root_device_unregister(). 12460aa0dc41SMark McLoughlin * 12470aa0dc41SMark McLoughlin * Root devices are dummy devices which allow other devices 12480aa0dc41SMark McLoughlin * to be grouped under /sys/devices. Use this function to 12490aa0dc41SMark McLoughlin * allocate a root device and then use it as the parent of 12500aa0dc41SMark McLoughlin * any device which should appear under /sys/devices/{name} 12510aa0dc41SMark McLoughlin * 12520aa0dc41SMark McLoughlin * The /sys/devices/{name} directory will also contain a 12530aa0dc41SMark McLoughlin * 'module' symlink which points to the @owner directory 12540aa0dc41SMark McLoughlin * in sysfs. 12550aa0dc41SMark McLoughlin * 12560aa0dc41SMark McLoughlin * Note: You probably want to use root_device_register(). 12570aa0dc41SMark McLoughlin */ 12580aa0dc41SMark McLoughlin struct device *__root_device_register(const char *name, struct module *owner) 12590aa0dc41SMark McLoughlin { 12600aa0dc41SMark McLoughlin struct root_device *root; 12610aa0dc41SMark McLoughlin int err = -ENOMEM; 12620aa0dc41SMark McLoughlin 12630aa0dc41SMark McLoughlin root = kzalloc(sizeof(struct root_device), GFP_KERNEL); 12640aa0dc41SMark McLoughlin if (!root) 12650aa0dc41SMark McLoughlin return ERR_PTR(err); 12660aa0dc41SMark McLoughlin 12670aa0dc41SMark McLoughlin err = dev_set_name(&root->dev, name); 12680aa0dc41SMark McLoughlin if (err) { 12690aa0dc41SMark McLoughlin kfree(root); 12700aa0dc41SMark McLoughlin return ERR_PTR(err); 12710aa0dc41SMark McLoughlin } 12720aa0dc41SMark McLoughlin 12730aa0dc41SMark McLoughlin root->dev.release = root_device_release; 12740aa0dc41SMark McLoughlin 12750aa0dc41SMark McLoughlin err = device_register(&root->dev); 12760aa0dc41SMark McLoughlin if (err) { 12770aa0dc41SMark McLoughlin put_device(&root->dev); 12780aa0dc41SMark McLoughlin return ERR_PTR(err); 12790aa0dc41SMark McLoughlin } 12800aa0dc41SMark McLoughlin 12810aa0dc41SMark McLoughlin #ifdef CONFIG_MODULE /* gotta find a "cleaner" way to do this */ 12820aa0dc41SMark McLoughlin if (owner) { 12830aa0dc41SMark McLoughlin struct module_kobject *mk = &owner->mkobj; 12840aa0dc41SMark McLoughlin 12850aa0dc41SMark McLoughlin err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); 12860aa0dc41SMark McLoughlin if (err) { 12870aa0dc41SMark McLoughlin device_unregister(&root->dev); 12880aa0dc41SMark McLoughlin return ERR_PTR(err); 12890aa0dc41SMark McLoughlin } 12900aa0dc41SMark McLoughlin root->owner = owner; 12910aa0dc41SMark McLoughlin } 12920aa0dc41SMark McLoughlin #endif 12930aa0dc41SMark McLoughlin 12940aa0dc41SMark McLoughlin return &root->dev; 12950aa0dc41SMark McLoughlin } 12960aa0dc41SMark McLoughlin EXPORT_SYMBOL_GPL(__root_device_register); 12970aa0dc41SMark McLoughlin 12980aa0dc41SMark McLoughlin /** 12990aa0dc41SMark McLoughlin * root_device_unregister - unregister and free a root device 13007cbcf225SRandy Dunlap * @dev: device going away 13010aa0dc41SMark McLoughlin * 13020aa0dc41SMark McLoughlin * This function unregisters and cleans up a device that was created by 13030aa0dc41SMark McLoughlin * root_device_register(). 13040aa0dc41SMark McLoughlin */ 13050aa0dc41SMark McLoughlin void root_device_unregister(struct device *dev) 13060aa0dc41SMark McLoughlin { 13070aa0dc41SMark McLoughlin struct root_device *root = to_root_device(dev); 13080aa0dc41SMark McLoughlin 13090aa0dc41SMark McLoughlin if (root->owner) 13100aa0dc41SMark McLoughlin sysfs_remove_link(&root->dev.kobj, "module"); 13110aa0dc41SMark McLoughlin 13120aa0dc41SMark McLoughlin device_unregister(dev); 13130aa0dc41SMark McLoughlin } 13140aa0dc41SMark McLoughlin EXPORT_SYMBOL_GPL(root_device_unregister); 13150aa0dc41SMark McLoughlin 131623681e47SGreg Kroah-Hartman 131723681e47SGreg Kroah-Hartman static void device_create_release(struct device *dev) 131823681e47SGreg Kroah-Hartman { 13191e0b2cf9SKay Sievers pr_debug("device: '%s': %s\n", dev_name(dev), __func__); 132023681e47SGreg Kroah-Hartman kfree(dev); 132123681e47SGreg Kroah-Hartman } 132223681e47SGreg Kroah-Hartman 132323681e47SGreg Kroah-Hartman /** 13248882b394SGreg Kroah-Hartman * device_create_vargs - creates a device and registers it with sysfs 13258882b394SGreg Kroah-Hartman * @class: pointer to the struct class that this device should be registered to 13268882b394SGreg Kroah-Hartman * @parent: pointer to the parent struct device of this new device, if any 13278882b394SGreg Kroah-Hartman * @devt: the dev_t for the char device to be added 13288882b394SGreg Kroah-Hartman * @drvdata: the data to be added to the device for callbacks 13298882b394SGreg Kroah-Hartman * @fmt: string for the device's name 13308882b394SGreg Kroah-Hartman * @args: va_list for the device's name 13318882b394SGreg Kroah-Hartman * 13328882b394SGreg Kroah-Hartman * This function can be used by char device classes. A struct device 13338882b394SGreg Kroah-Hartman * will be created in sysfs, registered to the specified class. 13348882b394SGreg Kroah-Hartman * 13358882b394SGreg Kroah-Hartman * A "dev" file will be created, showing the dev_t for the device, if 13368882b394SGreg Kroah-Hartman * the dev_t is not 0,0. 13378882b394SGreg Kroah-Hartman * If a pointer to a parent struct device is passed in, the newly created 13388882b394SGreg Kroah-Hartman * struct device will be a child of that device in sysfs. 13398882b394SGreg Kroah-Hartman * The pointer to the struct device will be returned from the call. 13408882b394SGreg Kroah-Hartman * Any further sysfs files that might be required can be created using this 13418882b394SGreg Kroah-Hartman * pointer. 13428882b394SGreg Kroah-Hartman * 13438882b394SGreg Kroah-Hartman * Note: the struct class passed to this function must have previously 13448882b394SGreg Kroah-Hartman * been created with a call to class_create(). 13458882b394SGreg Kroah-Hartman */ 13468882b394SGreg Kroah-Hartman struct device *device_create_vargs(struct class *class, struct device *parent, 13478882b394SGreg Kroah-Hartman dev_t devt, void *drvdata, const char *fmt, 13488882b394SGreg Kroah-Hartman va_list args) 13498882b394SGreg Kroah-Hartman { 13508882b394SGreg Kroah-Hartman struct device *dev = NULL; 13518882b394SGreg Kroah-Hartman int retval = -ENODEV; 13528882b394SGreg Kroah-Hartman 13538882b394SGreg Kroah-Hartman if (class == NULL || IS_ERR(class)) 13548882b394SGreg Kroah-Hartman goto error; 13558882b394SGreg Kroah-Hartman 13568882b394SGreg Kroah-Hartman dev = kzalloc(sizeof(*dev), GFP_KERNEL); 13578882b394SGreg Kroah-Hartman if (!dev) { 13588882b394SGreg Kroah-Hartman retval = -ENOMEM; 13598882b394SGreg Kroah-Hartman goto error; 13608882b394SGreg Kroah-Hartman } 13618882b394SGreg Kroah-Hartman 13628882b394SGreg Kroah-Hartman dev->devt = devt; 13638882b394SGreg Kroah-Hartman dev->class = class; 13648882b394SGreg Kroah-Hartman dev->parent = parent; 13658882b394SGreg Kroah-Hartman dev->release = device_create_release; 13668882b394SGreg Kroah-Hartman dev_set_drvdata(dev, drvdata); 13678882b394SGreg Kroah-Hartman 13681fa5ae85SKay Sievers retval = kobject_set_name_vargs(&dev->kobj, fmt, args); 13691fa5ae85SKay Sievers if (retval) 13701fa5ae85SKay Sievers goto error; 13711fa5ae85SKay Sievers 13728882b394SGreg Kroah-Hartman retval = device_register(dev); 13738882b394SGreg Kroah-Hartman if (retval) 13748882b394SGreg Kroah-Hartman goto error; 13758882b394SGreg Kroah-Hartman 13768882b394SGreg Kroah-Hartman return dev; 13778882b394SGreg Kroah-Hartman 13788882b394SGreg Kroah-Hartman error: 1379286661b3SCornelia Huck put_device(dev); 13808882b394SGreg Kroah-Hartman return ERR_PTR(retval); 13818882b394SGreg Kroah-Hartman } 13828882b394SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create_vargs); 13838882b394SGreg Kroah-Hartman 13848882b394SGreg Kroah-Hartman /** 13854e106739SGreg Kroah-Hartman * device_create - creates a device and registers it with sysfs 13868882b394SGreg Kroah-Hartman * @class: pointer to the struct class that this device should be registered to 13878882b394SGreg Kroah-Hartman * @parent: pointer to the parent struct device of this new device, if any 13888882b394SGreg Kroah-Hartman * @devt: the dev_t for the char device to be added 13898882b394SGreg Kroah-Hartman * @drvdata: the data to be added to the device for callbacks 13908882b394SGreg Kroah-Hartman * @fmt: string for the device's name 13918882b394SGreg Kroah-Hartman * 13928882b394SGreg Kroah-Hartman * This function can be used by char device classes. A struct device 13938882b394SGreg Kroah-Hartman * will be created in sysfs, registered to the specified class. 13948882b394SGreg Kroah-Hartman * 13958882b394SGreg Kroah-Hartman * A "dev" file will be created, showing the dev_t for the device, if 13968882b394SGreg Kroah-Hartman * the dev_t is not 0,0. 13978882b394SGreg Kroah-Hartman * If a pointer to a parent struct device is passed in, the newly created 13988882b394SGreg Kroah-Hartman * struct device will be a child of that device in sysfs. 13998882b394SGreg Kroah-Hartman * The pointer to the struct device will be returned from the call. 14008882b394SGreg Kroah-Hartman * Any further sysfs files that might be required can be created using this 14018882b394SGreg Kroah-Hartman * pointer. 14028882b394SGreg Kroah-Hartman * 14038882b394SGreg Kroah-Hartman * Note: the struct class passed to this function must have previously 14048882b394SGreg Kroah-Hartman * been created with a call to class_create(). 14058882b394SGreg Kroah-Hartman */ 14064e106739SGreg Kroah-Hartman struct device *device_create(struct class *class, struct device *parent, 14074e106739SGreg Kroah-Hartman dev_t devt, void *drvdata, const char *fmt, ...) 14088882b394SGreg Kroah-Hartman { 14098882b394SGreg Kroah-Hartman va_list vargs; 14108882b394SGreg Kroah-Hartman struct device *dev; 14118882b394SGreg Kroah-Hartman 14128882b394SGreg Kroah-Hartman va_start(vargs, fmt); 14138882b394SGreg Kroah-Hartman dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); 14148882b394SGreg Kroah-Hartman va_end(vargs); 14158882b394SGreg Kroah-Hartman return dev; 14168882b394SGreg Kroah-Hartman } 14174e106739SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create); 14188882b394SGreg Kroah-Hartman 1419cd35449bSDave Young static int __match_devt(struct device *dev, void *data) 142023681e47SGreg Kroah-Hartman { 1421cd35449bSDave Young dev_t *devt = data; 142223681e47SGreg Kroah-Hartman 1423cd35449bSDave Young return dev->devt == *devt; 1424775b64d2SRafael J. Wysocki } 142523681e47SGreg Kroah-Hartman 1426775b64d2SRafael J. Wysocki /** 1427775b64d2SRafael J. Wysocki * device_destroy - removes a device that was created with device_create() 1428775b64d2SRafael J. Wysocki * @class: pointer to the struct class that this device was registered with 1429775b64d2SRafael J. Wysocki * @devt: the dev_t of the device that was previously registered 1430775b64d2SRafael J. Wysocki * 1431775b64d2SRafael J. Wysocki * This call unregisters and cleans up a device that was created with a 1432775b64d2SRafael J. Wysocki * call to device_create(). 1433775b64d2SRafael J. Wysocki */ 1434775b64d2SRafael J. Wysocki void device_destroy(struct class *class, dev_t devt) 1435775b64d2SRafael J. Wysocki { 1436775b64d2SRafael J. Wysocki struct device *dev; 1437775b64d2SRafael J. Wysocki 1438695794aeSGreg Kroah-Hartman dev = class_find_device(class, NULL, &devt, __match_devt); 1439cd35449bSDave Young if (dev) { 1440cd35449bSDave Young put_device(dev); 144123681e47SGreg Kroah-Hartman device_unregister(dev); 144223681e47SGreg Kroah-Hartman } 1443cd35449bSDave Young } 144423681e47SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_destroy); 1445a2de48caSGreg Kroah-Hartman 1446a2de48caSGreg Kroah-Hartman /** 1447a2de48caSGreg Kroah-Hartman * device_rename - renames a device 1448a2de48caSGreg Kroah-Hartman * @dev: the pointer to the struct device to be renamed 1449a2de48caSGreg Kroah-Hartman * @new_name: the new name of the device 1450030c1d2bSEric W. Biederman * 1451030c1d2bSEric W. Biederman * It is the responsibility of the caller to provide mutual 1452030c1d2bSEric W. Biederman * exclusion between two different calls of device_rename 1453030c1d2bSEric W. Biederman * on the same device to ensure that new_name is valid and 1454030c1d2bSEric W. Biederman * won't conflict with other devices. 1455a2de48caSGreg Kroah-Hartman */ 1456a2de48caSGreg Kroah-Hartman int device_rename(struct device *dev, char *new_name) 1457a2de48caSGreg Kroah-Hartman { 1458a2de48caSGreg Kroah-Hartman char *old_class_name = NULL; 1459a2de48caSGreg Kroah-Hartman char *new_class_name = NULL; 14602ee97cafSCornelia Huck char *old_device_name = NULL; 1461a2de48caSGreg Kroah-Hartman int error; 1462a2de48caSGreg Kroah-Hartman 1463a2de48caSGreg Kroah-Hartman dev = get_device(dev); 1464a2de48caSGreg Kroah-Hartman if (!dev) 1465a2de48caSGreg Kroah-Hartman return -EINVAL; 1466a2de48caSGreg Kroah-Hartman 14671e0b2cf9SKay Sievers pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), 14682b3a302aSHarvey Harrison __func__, new_name); 1469a2de48caSGreg Kroah-Hartman 147099ef3ef8SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 1471a2de48caSGreg Kroah-Hartman if ((dev->class) && (dev->parent)) 1472a2de48caSGreg Kroah-Hartman old_class_name = make_class_name(dev->class->name, &dev->kobj); 147399ef3ef8SKay Sievers #endif 1474a2de48caSGreg Kroah-Hartman 14751fa5ae85SKay Sievers old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); 14762ee97cafSCornelia Huck if (!old_device_name) { 1477952ab431SJesper Juhl error = -ENOMEM; 14782ee97cafSCornelia Huck goto out; 1479952ab431SJesper Juhl } 1480a2de48caSGreg Kroah-Hartman 1481a2de48caSGreg Kroah-Hartman error = kobject_rename(&dev->kobj, new_name); 14821fa5ae85SKay Sievers if (error) 14832ee97cafSCornelia Huck goto out; 1484a2de48caSGreg Kroah-Hartman 148599ef3ef8SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 1486a2de48caSGreg Kroah-Hartman if (old_class_name) { 1487a2de48caSGreg Kroah-Hartman new_class_name = make_class_name(dev->class->name, &dev->kobj); 1488a2de48caSGreg Kroah-Hartman if (new_class_name) { 148936ce6dadSCornelia Huck error = sysfs_create_link_nowarn(&dev->parent->kobj, 149036ce6dadSCornelia Huck &dev->kobj, 149136ce6dadSCornelia Huck new_class_name); 14922ee97cafSCornelia Huck if (error) 14932ee97cafSCornelia Huck goto out; 1494a2de48caSGreg Kroah-Hartman sysfs_remove_link(&dev->parent->kobj, old_class_name); 1495a2de48caSGreg Kroah-Hartman } 1496a2de48caSGreg Kroah-Hartman } 149760b8cabdSKay Sievers #else 1498a2de48caSGreg Kroah-Hartman if (dev->class) { 149936ce6dadSCornelia Huck error = sysfs_create_link_nowarn(&dev->class->p->class_subsys.kobj, 15001e0b2cf9SKay Sievers &dev->kobj, dev_name(dev)); 15010599ad53SStephen Hemminger if (error) 15020599ad53SStephen Hemminger goto out; 15031fbfee6cSGreg Kroah-Hartman sysfs_remove_link(&dev->class->p->class_subsys.kobj, 15047c71448bSGreg Kroah-Hartman old_device_name); 15052ee97cafSCornelia Huck } 150660b8cabdSKay Sievers #endif 150760b8cabdSKay Sievers 15082ee97cafSCornelia Huck out: 1509a2de48caSGreg Kroah-Hartman put_device(dev); 1510a2de48caSGreg Kroah-Hartman 1511a2de48caSGreg Kroah-Hartman kfree(new_class_name); 1512952ab431SJesper Juhl kfree(old_class_name); 15132ee97cafSCornelia Huck kfree(old_device_name); 1514a2de48caSGreg Kroah-Hartman 1515a2de48caSGreg Kroah-Hartman return error; 1516a2de48caSGreg Kroah-Hartman } 1517a2807dbcSJohannes Berg EXPORT_SYMBOL_GPL(device_rename); 15188a82472fSCornelia Huck 15198a82472fSCornelia Huck static int device_move_class_links(struct device *dev, 15208a82472fSCornelia Huck struct device *old_parent, 15218a82472fSCornelia Huck struct device *new_parent) 15228a82472fSCornelia Huck { 1523f7f3461dSGreg Kroah-Hartman int error = 0; 15248a82472fSCornelia Huck #ifdef CONFIG_SYSFS_DEPRECATED 15258a82472fSCornelia Huck char *class_name; 15268a82472fSCornelia Huck 15278a82472fSCornelia Huck class_name = make_class_name(dev->class->name, &dev->kobj); 15288a82472fSCornelia Huck if (!class_name) { 1529cb360bbfSCornelia Huck error = -ENOMEM; 15308a82472fSCornelia Huck goto out; 15318a82472fSCornelia Huck } 15328a82472fSCornelia Huck if (old_parent) { 15338a82472fSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 15348a82472fSCornelia Huck sysfs_remove_link(&old_parent->kobj, class_name); 15358a82472fSCornelia Huck } 1536c744aeaeSCornelia Huck if (new_parent) { 1537c744aeaeSCornelia Huck error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 1538c744aeaeSCornelia Huck "device"); 15398a82472fSCornelia Huck if (error) 15408a82472fSCornelia Huck goto out; 1541c744aeaeSCornelia Huck error = sysfs_create_link(&new_parent->kobj, &dev->kobj, 1542c744aeaeSCornelia Huck class_name); 15438a82472fSCornelia Huck if (error) 15448a82472fSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 15454a3ad20cSGreg Kroah-Hartman } else 1546c744aeaeSCornelia Huck error = 0; 15478a82472fSCornelia Huck out: 15488a82472fSCornelia Huck kfree(class_name); 15498a82472fSCornelia Huck return error; 15508a82472fSCornelia Huck #else 1551f7f3461dSGreg Kroah-Hartman if (old_parent) 1552f7f3461dSGreg Kroah-Hartman sysfs_remove_link(&dev->kobj, "device"); 1553f7f3461dSGreg Kroah-Hartman if (new_parent) 1554f7f3461dSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 1555f7f3461dSGreg Kroah-Hartman "device"); 1556f7f3461dSGreg Kroah-Hartman return error; 15578a82472fSCornelia Huck #endif 15588a82472fSCornelia Huck } 15598a82472fSCornelia Huck 15608a82472fSCornelia Huck /** 15618a82472fSCornelia Huck * device_move - moves a device to a new parent 15628a82472fSCornelia Huck * @dev: the pointer to the struct device to be moved 1563c744aeaeSCornelia Huck * @new_parent: the new parent of the device (can by NULL) 1564ffa6a705SCornelia Huck * @dpm_order: how to reorder the dpm_list 15658a82472fSCornelia Huck */ 1566ffa6a705SCornelia Huck int device_move(struct device *dev, struct device *new_parent, 1567ffa6a705SCornelia Huck enum dpm_order dpm_order) 15688a82472fSCornelia Huck { 15698a82472fSCornelia Huck int error; 15708a82472fSCornelia Huck struct device *old_parent; 1571c744aeaeSCornelia Huck struct kobject *new_parent_kobj; 15728a82472fSCornelia Huck 15738a82472fSCornelia Huck dev = get_device(dev); 15748a82472fSCornelia Huck if (!dev) 15758a82472fSCornelia Huck return -EINVAL; 15768a82472fSCornelia Huck 1577ffa6a705SCornelia Huck device_pm_lock(); 15788a82472fSCornelia Huck new_parent = get_device(new_parent); 1579c744aeaeSCornelia Huck new_parent_kobj = get_device_parent(dev, new_parent); 158063b6971aSCornelia Huck 15811e0b2cf9SKay Sievers pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), 15821e0b2cf9SKay Sievers __func__, new_parent ? dev_name(new_parent) : "<NULL>"); 1583c744aeaeSCornelia Huck error = kobject_move(&dev->kobj, new_parent_kobj); 15848a82472fSCornelia Huck if (error) { 158563b6971aSCornelia Huck cleanup_glue_dir(dev, new_parent_kobj); 15868a82472fSCornelia Huck put_device(new_parent); 15878a82472fSCornelia Huck goto out; 15888a82472fSCornelia Huck } 15898a82472fSCornelia Huck old_parent = dev->parent; 15908a82472fSCornelia Huck dev->parent = new_parent; 15918a82472fSCornelia Huck if (old_parent) 1592f791b8c8SGreg Kroah-Hartman klist_remove(&dev->p->knode_parent); 15930d358f22SYinghai Lu if (new_parent) { 1594f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 1595f791b8c8SGreg Kroah-Hartman &new_parent->p->klist_children); 15960d358f22SYinghai Lu set_dev_node(dev, dev_to_node(new_parent)); 15970d358f22SYinghai Lu } 15980d358f22SYinghai Lu 15998a82472fSCornelia Huck if (!dev->class) 16008a82472fSCornelia Huck goto out_put; 16018a82472fSCornelia Huck error = device_move_class_links(dev, old_parent, new_parent); 16028a82472fSCornelia Huck if (error) { 16038a82472fSCornelia Huck /* We ignore errors on cleanup since we're hosed anyway... */ 16048a82472fSCornelia Huck device_move_class_links(dev, new_parent, old_parent); 16058a82472fSCornelia Huck if (!kobject_move(&dev->kobj, &old_parent->kobj)) { 1606c744aeaeSCornelia Huck if (new_parent) 1607f791b8c8SGreg Kroah-Hartman klist_remove(&dev->p->knode_parent); 16080d358f22SYinghai Lu dev->parent = old_parent; 16090d358f22SYinghai Lu if (old_parent) { 1610f791b8c8SGreg Kroah-Hartman klist_add_tail(&dev->p->knode_parent, 1611f791b8c8SGreg Kroah-Hartman &old_parent->p->klist_children); 16120d358f22SYinghai Lu set_dev_node(dev, dev_to_node(old_parent)); 16130d358f22SYinghai Lu } 16148a82472fSCornelia Huck } 161563b6971aSCornelia Huck cleanup_glue_dir(dev, new_parent_kobj); 16168a82472fSCornelia Huck put_device(new_parent); 16178a82472fSCornelia Huck goto out; 16188a82472fSCornelia Huck } 1619ffa6a705SCornelia Huck switch (dpm_order) { 1620ffa6a705SCornelia Huck case DPM_ORDER_NONE: 1621ffa6a705SCornelia Huck break; 1622ffa6a705SCornelia Huck case DPM_ORDER_DEV_AFTER_PARENT: 1623ffa6a705SCornelia Huck device_pm_move_after(dev, new_parent); 1624ffa6a705SCornelia Huck break; 1625ffa6a705SCornelia Huck case DPM_ORDER_PARENT_BEFORE_DEV: 1626ffa6a705SCornelia Huck device_pm_move_before(new_parent, dev); 1627ffa6a705SCornelia Huck break; 1628ffa6a705SCornelia Huck case DPM_ORDER_DEV_LAST: 1629ffa6a705SCornelia Huck device_pm_move_last(dev); 1630ffa6a705SCornelia Huck break; 1631ffa6a705SCornelia Huck } 16328a82472fSCornelia Huck out_put: 16338a82472fSCornelia Huck put_device(old_parent); 16348a82472fSCornelia Huck out: 1635ffa6a705SCornelia Huck device_pm_unlock(); 16368a82472fSCornelia Huck put_device(dev); 16378a82472fSCornelia Huck return error; 16388a82472fSCornelia Huck } 16398a82472fSCornelia Huck EXPORT_SYMBOL_GPL(device_move); 164037b0c020SGreg Kroah-Hartman 164137b0c020SGreg Kroah-Hartman /** 164237b0c020SGreg Kroah-Hartman * device_shutdown - call ->shutdown() on each device to shutdown. 164337b0c020SGreg Kroah-Hartman */ 164437b0c020SGreg Kroah-Hartman void device_shutdown(void) 164537b0c020SGreg Kroah-Hartman { 164637b0c020SGreg Kroah-Hartman struct device *dev, *devn; 164737b0c020SGreg Kroah-Hartman 164837b0c020SGreg Kroah-Hartman list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, 164937b0c020SGreg Kroah-Hartman kobj.entry) { 165037b0c020SGreg Kroah-Hartman if (dev->bus && dev->bus->shutdown) { 165137b0c020SGreg Kroah-Hartman dev_dbg(dev, "shutdown\n"); 165237b0c020SGreg Kroah-Hartman dev->bus->shutdown(dev); 165337b0c020SGreg Kroah-Hartman } else if (dev->driver && dev->driver->shutdown) { 165437b0c020SGreg Kroah-Hartman dev_dbg(dev, "shutdown\n"); 165537b0c020SGreg Kroah-Hartman dev->driver->shutdown(dev); 165637b0c020SGreg Kroah-Hartman } 165737b0c020SGreg Kroah-Hartman } 1658e105b8bfSDan Williams kobject_put(sysfs_dev_char_kobj); 1659e105b8bfSDan Williams kobject_put(sysfs_dev_block_kobj); 1660e105b8bfSDan Williams kobject_put(dev_kobj); 166137b0c020SGreg Kroah-Hartman } 1662