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> 221da177e4SLinus Torvalds #include <asm/semaphore.h> 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include "base.h" 251da177e4SLinus Torvalds #include "power/power.h" 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds int (*platform_notify)(struct device * dev) = NULL; 281da177e4SLinus Torvalds int (*platform_notify_remove)(struct device * dev) = NULL; 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds /* 311da177e4SLinus Torvalds * sysfs bindings for devices. 321da177e4SLinus Torvalds */ 331da177e4SLinus Torvalds 343e95637aSAlan Stern /** 353e95637aSAlan Stern * dev_driver_string - Return a device's driver name, if at all possible 363e95637aSAlan Stern * @dev: struct device to get the name of 373e95637aSAlan Stern * 383e95637aSAlan Stern * Will return the device's driver's name if it is bound to a device. If 393e95637aSAlan Stern * the device is not bound to a device, it will return the name of the bus 403e95637aSAlan Stern * it is attached to. If it is not attached to a bus either, an empty 413e95637aSAlan Stern * string will be returned. 423e95637aSAlan Stern */ 433e95637aSAlan Stern const char *dev_driver_string(struct device *dev) 443e95637aSAlan Stern { 453e95637aSAlan Stern return dev->driver ? dev->driver->name : 46a456b702SJean Delvare (dev->bus ? dev->bus->name : 47a456b702SJean Delvare (dev->class ? dev->class->name : "")); 483e95637aSAlan Stern } 49310a922dSMatthew Wilcox EXPORT_SYMBOL(dev_driver_string); 503e95637aSAlan Stern 511da177e4SLinus Torvalds #define to_dev(obj) container_of(obj, struct device, kobj) 521da177e4SLinus Torvalds #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static ssize_t 551da177e4SLinus Torvalds dev_attr_show(struct kobject * kobj, struct attribute * attr, char * buf) 561da177e4SLinus Torvalds { 571da177e4SLinus Torvalds struct device_attribute * dev_attr = to_dev_attr(attr); 581da177e4SLinus Torvalds struct device * dev = to_dev(kobj); 594a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds if (dev_attr->show) 6254b6f35cSYani Ioannou ret = dev_attr->show(dev, dev_attr, buf); 631da177e4SLinus Torvalds return ret; 641da177e4SLinus Torvalds } 651da177e4SLinus Torvalds 661da177e4SLinus Torvalds static ssize_t 671da177e4SLinus Torvalds dev_attr_store(struct kobject * kobj, struct attribute * attr, 681da177e4SLinus Torvalds const char * buf, size_t count) 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->store) 7554b6f35cSYani Ioannou ret = dev_attr->store(dev, dev_attr, buf, count); 761da177e4SLinus Torvalds return ret; 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds static struct sysfs_ops dev_sysfs_ops = { 801da177e4SLinus Torvalds .show = dev_attr_show, 811da177e4SLinus Torvalds .store = dev_attr_store, 821da177e4SLinus Torvalds }; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds /** 861da177e4SLinus Torvalds * device_release - free device structure. 871da177e4SLinus Torvalds * @kobj: device's kobject. 881da177e4SLinus Torvalds * 891da177e4SLinus Torvalds * This is called once the reference count for the object 901da177e4SLinus Torvalds * reaches 0. We forward the call to the device's release 911da177e4SLinus Torvalds * method, which should handle actually freeing the structure. 921da177e4SLinus Torvalds */ 931da177e4SLinus Torvalds static void device_release(struct kobject * kobj) 941da177e4SLinus Torvalds { 951da177e4SLinus Torvalds struct device * dev = to_dev(kobj); 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds if (dev->release) 981da177e4SLinus Torvalds dev->release(dev); 99f9f852dfSKay Sievers else if (dev->type && dev->type->release) 100f9f852dfSKay Sievers dev->type->release(dev); 1012620efefSGreg Kroah-Hartman else if (dev->class && dev->class->dev_release) 1022620efefSGreg Kroah-Hartman dev->class->dev_release(dev); 1031da177e4SLinus Torvalds else { 1041da177e4SLinus Torvalds printk(KERN_ERR "Device '%s' does not have a release() function, " 1051da177e4SLinus Torvalds "it is broken and must be fixed.\n", 1061da177e4SLinus Torvalds dev->bus_id); 1071da177e4SLinus Torvalds WARN_ON(1); 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds } 1101da177e4SLinus Torvalds 1118f4afc41SGreg Kroah-Hartman static struct kobj_type device_ktype = { 1121da177e4SLinus Torvalds .release = device_release, 1131da177e4SLinus Torvalds .sysfs_ops = &dev_sysfs_ops, 1141da177e4SLinus Torvalds }; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds 117312c004dSKay Sievers static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds struct kobj_type *ktype = get_ktype(kobj); 1201da177e4SLinus Torvalds 1218f4afc41SGreg Kroah-Hartman if (ktype == &device_ktype) { 1221da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 12383b5fb4cSCornelia Huck if (dev->uevent_suppress) 12483b5fb4cSCornelia Huck return 0; 1251da177e4SLinus Torvalds if (dev->bus) 1261da177e4SLinus Torvalds return 1; 12723681e47SGreg Kroah-Hartman if (dev->class) 12823681e47SGreg Kroah-Hartman return 1; 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds return 0; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 133312c004dSKay Sievers static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1361da177e4SLinus Torvalds 13723681e47SGreg Kroah-Hartman if (dev->bus) 1381da177e4SLinus Torvalds return dev->bus->name; 13923681e47SGreg Kroah-Hartman if (dev->class) 14023681e47SGreg Kroah-Hartman return dev->class->name; 14123681e47SGreg Kroah-Hartman return NULL; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds 1447eff2e7aSKay Sievers static int dev_uevent(struct kset *kset, struct kobject *kobj, 1457eff2e7aSKay Sievers struct kobj_uevent_env *env) 1461da177e4SLinus Torvalds { 1471da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1481da177e4SLinus Torvalds int retval = 0; 1491da177e4SLinus Torvalds 15023681e47SGreg Kroah-Hartman /* add the major/minor if present */ 15123681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 1527eff2e7aSKay Sievers add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); 1537eff2e7aSKay Sievers add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); 15423681e47SGreg Kroah-Hartman } 15523681e47SGreg Kroah-Hartman 156414264f9SKay Sievers if (dev->type && dev->type->name) 1577eff2e7aSKay Sievers add_uevent_var(env, "DEVTYPE=%s", dev->type->name); 158414264f9SKay Sievers 159239378f1SKay Sievers if (dev->driver) 1607eff2e7aSKay Sievers add_uevent_var(env, "DRIVER=%s", dev->driver->name); 161239378f1SKay Sievers 162a87cb2acSKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 163239378f1SKay Sievers if (dev->class) { 164239378f1SKay Sievers struct device *parent = dev->parent; 165239378f1SKay Sievers 166239378f1SKay Sievers /* find first bus device in parent chain */ 167239378f1SKay Sievers while (parent && !parent->bus) 168239378f1SKay Sievers parent = parent->parent; 169239378f1SKay Sievers if (parent && parent->bus) { 170239378f1SKay Sievers const char *path; 171239378f1SKay Sievers 172239378f1SKay Sievers path = kobject_get_path(&parent->kobj, GFP_KERNEL); 1732c7afd12SKay Sievers if (path) { 1747eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVPATH=%s", path); 175239378f1SKay Sievers kfree(path); 1762c7afd12SKay Sievers } 177239378f1SKay Sievers 1787eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); 179239378f1SKay Sievers 180239378f1SKay Sievers if (parent->driver) 1817eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVDRIVER=%s", 1827eff2e7aSKay Sievers parent->driver->name); 183239378f1SKay Sievers } 184239378f1SKay Sievers } else if (dev->bus) { 1857eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); 186239378f1SKay Sievers 187239378f1SKay Sievers if (dev->driver) 1887eff2e7aSKay Sievers add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); 189d81d9d6bSKay Sievers } 190239378f1SKay Sievers #endif 1911da177e4SLinus Torvalds 1921da177e4SLinus Torvalds /* have the bus specific function add its stuff */ 1937eff2e7aSKay Sievers if (dev->bus && dev->bus->uevent) { 1947eff2e7aSKay Sievers retval = dev->bus->uevent(dev, env); 195f9f852dfSKay Sievers if (retval) 1967dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: bus uevent() returned %d\n", 1977dc72b28SGreg Kroah-Hartman dev->bus_id, __FUNCTION__, retval); 1981da177e4SLinus Torvalds } 1991da177e4SLinus Torvalds 2002620efefSGreg Kroah-Hartman /* have the class specific function add its stuff */ 2017eff2e7aSKay Sievers if (dev->class && dev->class->dev_uevent) { 2027eff2e7aSKay Sievers retval = dev->class->dev_uevent(dev, env); 203f9f852dfSKay Sievers if (retval) 2047dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: class uevent() " 2057dc72b28SGreg Kroah-Hartman "returned %d\n", dev->bus_id, 2062620efefSGreg Kroah-Hartman __FUNCTION__, retval); 2072620efefSGreg Kroah-Hartman } 208f9f852dfSKay Sievers 209f9f852dfSKay Sievers /* have the device type specific fuction add its stuff */ 2107eff2e7aSKay Sievers if (dev->type && dev->type->uevent) { 2117eff2e7aSKay Sievers retval = dev->type->uevent(dev, env); 212f9f852dfSKay Sievers if (retval) 2137dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: dev_type uevent() " 2147dc72b28SGreg Kroah-Hartman "returned %d\n", dev->bus_id, 215f9f852dfSKay Sievers __FUNCTION__, retval); 2162620efefSGreg Kroah-Hartman } 2172620efefSGreg Kroah-Hartman 2181da177e4SLinus Torvalds return retval; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds 221312c004dSKay Sievers static struct kset_uevent_ops device_uevent_ops = { 222312c004dSKay Sievers .filter = dev_uevent_filter, 223312c004dSKay Sievers .name = dev_uevent_name, 224312c004dSKay Sievers .uevent = dev_uevent, 2251da177e4SLinus Torvalds }; 2261da177e4SLinus Torvalds 22716574dccSKay Sievers static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, 22816574dccSKay Sievers char *buf) 22916574dccSKay Sievers { 23016574dccSKay Sievers struct kobject *top_kobj; 23116574dccSKay Sievers struct kset *kset; 2327eff2e7aSKay Sievers struct kobj_uevent_env *env = NULL; 23316574dccSKay Sievers int i; 23416574dccSKay Sievers size_t count = 0; 23516574dccSKay Sievers int retval; 23616574dccSKay Sievers 23716574dccSKay Sievers /* search the kset, the device belongs to */ 23816574dccSKay Sievers top_kobj = &dev->kobj; 2395c5daf65SKay Sievers while (!top_kobj->kset && top_kobj->parent) 24016574dccSKay Sievers top_kobj = top_kobj->parent; 24116574dccSKay Sievers if (!top_kobj->kset) 24216574dccSKay Sievers goto out; 2435c5daf65SKay Sievers 24416574dccSKay Sievers kset = top_kobj->kset; 24516574dccSKay Sievers if (!kset->uevent_ops || !kset->uevent_ops->uevent) 24616574dccSKay Sievers goto out; 24716574dccSKay Sievers 24816574dccSKay Sievers /* respect filter */ 24916574dccSKay Sievers if (kset->uevent_ops && kset->uevent_ops->filter) 25016574dccSKay Sievers if (!kset->uevent_ops->filter(kset, &dev->kobj)) 25116574dccSKay Sievers goto out; 25216574dccSKay Sievers 2537eff2e7aSKay Sievers env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); 2547eff2e7aSKay Sievers if (!env) 255c7308c81SGreg Kroah-Hartman return -ENOMEM; 256c7308c81SGreg Kroah-Hartman 25716574dccSKay Sievers /* let the kset specific function add its keys */ 2587eff2e7aSKay Sievers retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); 25916574dccSKay Sievers if (retval) 26016574dccSKay Sievers goto out; 26116574dccSKay Sievers 26216574dccSKay Sievers /* copy keys to file */ 2637eff2e7aSKay Sievers for (i = 0; i < env->envp_idx; i++) 2647eff2e7aSKay Sievers count += sprintf(&buf[count], "%s\n", env->envp[i]); 26516574dccSKay Sievers out: 2667eff2e7aSKay Sievers kfree(env); 26716574dccSKay Sievers return count; 26816574dccSKay Sievers } 26916574dccSKay Sievers 270a7fd6706SKay Sievers static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, 271a7fd6706SKay Sievers const char *buf, size_t count) 272a7fd6706SKay Sievers { 27360a96a59SKay Sievers enum kobject_action action; 27460a96a59SKay Sievers 2755c5daf65SKay Sievers if (kobject_action_type(buf, count, &action) == 0) { 27660a96a59SKay Sievers kobject_uevent(&dev->kobj, action); 27760a96a59SKay Sievers goto out; 27860a96a59SKay Sievers } 27960a96a59SKay Sievers 28022af74f3SKay Sievers dev_err(dev, "uevent: unsupported action-string; this will " 28160a96a59SKay Sievers "be ignored in a future kernel version\n"); 282312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 28360a96a59SKay Sievers out: 284a7fd6706SKay Sievers return count; 285a7fd6706SKay Sievers } 286a7fd6706SKay Sievers 287ad6a1e1cSTejun Heo static struct device_attribute uevent_attr = 288ad6a1e1cSTejun Heo __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); 289ad6a1e1cSTejun Heo 290621a1672SDmitry Torokhov static int device_add_attributes(struct device *dev, 291621a1672SDmitry Torokhov struct device_attribute *attrs) 292de0ff00dSGreg Kroah-Hartman { 293de0ff00dSGreg Kroah-Hartman int error = 0; 294621a1672SDmitry Torokhov int i; 295de0ff00dSGreg Kroah-Hartman 296621a1672SDmitry Torokhov if (attrs) { 297621a1672SDmitry Torokhov for (i = 0; attr_name(attrs[i]); i++) { 298621a1672SDmitry Torokhov error = device_create_file(dev, &attrs[i]); 299621a1672SDmitry Torokhov if (error) 300621a1672SDmitry Torokhov break; 301621a1672SDmitry Torokhov } 302621a1672SDmitry Torokhov if (error) 303de0ff00dSGreg Kroah-Hartman while (--i >= 0) 304621a1672SDmitry Torokhov device_remove_file(dev, &attrs[i]); 305de0ff00dSGreg Kroah-Hartman } 306de0ff00dSGreg Kroah-Hartman return error; 307de0ff00dSGreg Kroah-Hartman } 308de0ff00dSGreg Kroah-Hartman 309621a1672SDmitry Torokhov static void device_remove_attributes(struct device *dev, 310621a1672SDmitry Torokhov struct device_attribute *attrs) 311de0ff00dSGreg Kroah-Hartman { 312de0ff00dSGreg Kroah-Hartman int i; 313621a1672SDmitry Torokhov 314621a1672SDmitry Torokhov if (attrs) 315621a1672SDmitry Torokhov for (i = 0; attr_name(attrs[i]); i++) 316621a1672SDmitry Torokhov device_remove_file(dev, &attrs[i]); 317621a1672SDmitry Torokhov } 318621a1672SDmitry Torokhov 319621a1672SDmitry Torokhov static int device_add_groups(struct device *dev, 320621a1672SDmitry Torokhov struct attribute_group **groups) 321621a1672SDmitry Torokhov { 322621a1672SDmitry Torokhov int error = 0; 323621a1672SDmitry Torokhov int i; 324621a1672SDmitry Torokhov 325621a1672SDmitry Torokhov if (groups) { 326621a1672SDmitry Torokhov for (i = 0; groups[i]; i++) { 327621a1672SDmitry Torokhov error = sysfs_create_group(&dev->kobj, groups[i]); 328621a1672SDmitry Torokhov if (error) { 329621a1672SDmitry Torokhov while (--i >= 0) 330621a1672SDmitry Torokhov sysfs_remove_group(&dev->kobj, groups[i]); 331621a1672SDmitry Torokhov break; 332de0ff00dSGreg Kroah-Hartman } 333de0ff00dSGreg Kroah-Hartman } 334de0ff00dSGreg Kroah-Hartman } 335621a1672SDmitry Torokhov return error; 336621a1672SDmitry Torokhov } 337621a1672SDmitry Torokhov 338621a1672SDmitry Torokhov static void device_remove_groups(struct device *dev, 339621a1672SDmitry Torokhov struct attribute_group **groups) 340621a1672SDmitry Torokhov { 341621a1672SDmitry Torokhov int i; 342621a1672SDmitry Torokhov 343621a1672SDmitry Torokhov if (groups) 344621a1672SDmitry Torokhov for (i = 0; groups[i]; i++) 345621a1672SDmitry Torokhov sysfs_remove_group(&dev->kobj, groups[i]); 346621a1672SDmitry Torokhov } 347de0ff00dSGreg Kroah-Hartman 3482620efefSGreg Kroah-Hartman static int device_add_attrs(struct device *dev) 3492620efefSGreg Kroah-Hartman { 3502620efefSGreg Kroah-Hartman struct class *class = dev->class; 351f9f852dfSKay Sievers struct device_type *type = dev->type; 352621a1672SDmitry Torokhov int error; 3532620efefSGreg Kroah-Hartman 354621a1672SDmitry Torokhov if (class) { 355621a1672SDmitry Torokhov error = device_add_attributes(dev, class->dev_attrs); 3562620efefSGreg Kroah-Hartman if (error) 357621a1672SDmitry Torokhov return error; 358f9f852dfSKay Sievers } 359f9f852dfSKay Sievers 360621a1672SDmitry Torokhov if (type) { 361621a1672SDmitry Torokhov error = device_add_groups(dev, type->groups); 362f9f852dfSKay Sievers if (error) 363621a1672SDmitry Torokhov goto err_remove_class_attrs; 364f9f852dfSKay Sievers } 365621a1672SDmitry Torokhov 366621a1672SDmitry Torokhov error = device_add_groups(dev, dev->groups); 367f9f852dfSKay Sievers if (error) 368621a1672SDmitry Torokhov goto err_remove_type_groups; 369621a1672SDmitry Torokhov 370621a1672SDmitry Torokhov return 0; 371621a1672SDmitry Torokhov 372621a1672SDmitry Torokhov err_remove_type_groups: 373621a1672SDmitry Torokhov if (type) 374621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 375621a1672SDmitry Torokhov err_remove_class_attrs: 376621a1672SDmitry Torokhov if (class) 377621a1672SDmitry Torokhov device_remove_attributes(dev, class->dev_attrs); 378f9f852dfSKay Sievers 3792620efefSGreg Kroah-Hartman return error; 3802620efefSGreg Kroah-Hartman } 3812620efefSGreg Kroah-Hartman 3822620efefSGreg Kroah-Hartman static void device_remove_attrs(struct device *dev) 3832620efefSGreg Kroah-Hartman { 3842620efefSGreg Kroah-Hartman struct class *class = dev->class; 385f9f852dfSKay Sievers struct device_type *type = dev->type; 3862620efefSGreg Kroah-Hartman 387621a1672SDmitry Torokhov device_remove_groups(dev, dev->groups); 388f9f852dfSKay Sievers 389621a1672SDmitry Torokhov if (type) 390621a1672SDmitry Torokhov device_remove_groups(dev, type->groups); 391621a1672SDmitry Torokhov 392621a1672SDmitry Torokhov if (class) 393621a1672SDmitry Torokhov device_remove_attributes(dev, class->dev_attrs); 3942620efefSGreg Kroah-Hartman } 3952620efefSGreg Kroah-Hartman 3962620efefSGreg Kroah-Hartman 39723681e47SGreg Kroah-Hartman static ssize_t show_dev(struct device *dev, struct device_attribute *attr, 39823681e47SGreg Kroah-Hartman char *buf) 39923681e47SGreg Kroah-Hartman { 40023681e47SGreg Kroah-Hartman return print_dev_t(buf, dev->devt); 40123681e47SGreg Kroah-Hartman } 40223681e47SGreg Kroah-Hartman 403ad6a1e1cSTejun Heo static struct device_attribute devt_attr = 404ad6a1e1cSTejun Heo __ATTR(dev, S_IRUGO, show_dev, NULL); 405ad6a1e1cSTejun Heo 406881c6cfdSGreg Kroah-Hartman /* kset to create /sys/devices/ */ 407881c6cfdSGreg Kroah-Hartman struct kset *devices_kset; 4081da177e4SLinus Torvalds 4091da177e4SLinus Torvalds 4101da177e4SLinus Torvalds /** 4111da177e4SLinus Torvalds * device_create_file - create sysfs attribute file for device. 4121da177e4SLinus Torvalds * @dev: device. 4131da177e4SLinus Torvalds * @attr: device attribute descriptor. 4141da177e4SLinus Torvalds */ 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds int device_create_file(struct device * dev, struct device_attribute * attr) 4171da177e4SLinus Torvalds { 4181da177e4SLinus Torvalds int error = 0; 4191da177e4SLinus Torvalds if (get_device(dev)) { 4201da177e4SLinus Torvalds error = sysfs_create_file(&dev->kobj, &attr->attr); 4211da177e4SLinus Torvalds put_device(dev); 4221da177e4SLinus Torvalds } 4231da177e4SLinus Torvalds return error; 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds 4261da177e4SLinus Torvalds /** 4271da177e4SLinus Torvalds * device_remove_file - remove sysfs attribute file. 4281da177e4SLinus Torvalds * @dev: device. 4291da177e4SLinus Torvalds * @attr: device attribute descriptor. 4301da177e4SLinus Torvalds */ 4311da177e4SLinus Torvalds 4321da177e4SLinus Torvalds void device_remove_file(struct device * dev, struct device_attribute * attr) 4331da177e4SLinus Torvalds { 4341da177e4SLinus Torvalds if (get_device(dev)) { 4351da177e4SLinus Torvalds sysfs_remove_file(&dev->kobj, &attr->attr); 4361da177e4SLinus Torvalds put_device(dev); 4371da177e4SLinus Torvalds } 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds 4402589f188SGreg Kroah-Hartman /** 4412589f188SGreg Kroah-Hartman * device_create_bin_file - create sysfs binary attribute file for device. 4422589f188SGreg Kroah-Hartman * @dev: device. 4432589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 4442589f188SGreg Kroah-Hartman */ 4452589f188SGreg Kroah-Hartman int device_create_bin_file(struct device *dev, struct bin_attribute *attr) 4462589f188SGreg Kroah-Hartman { 4472589f188SGreg Kroah-Hartman int error = -EINVAL; 4482589f188SGreg Kroah-Hartman if (dev) 4492589f188SGreg Kroah-Hartman error = sysfs_create_bin_file(&dev->kobj, attr); 4502589f188SGreg Kroah-Hartman return error; 4512589f188SGreg Kroah-Hartman } 4522589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create_bin_file); 4532589f188SGreg Kroah-Hartman 4542589f188SGreg Kroah-Hartman /** 4552589f188SGreg Kroah-Hartman * device_remove_bin_file - remove sysfs binary attribute file 4562589f188SGreg Kroah-Hartman * @dev: device. 4572589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 4582589f188SGreg Kroah-Hartman */ 4592589f188SGreg Kroah-Hartman void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) 4602589f188SGreg Kroah-Hartman { 4612589f188SGreg Kroah-Hartman if (dev) 4622589f188SGreg Kroah-Hartman sysfs_remove_bin_file(&dev->kobj, attr); 4632589f188SGreg Kroah-Hartman } 4642589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_remove_bin_file); 4652589f188SGreg Kroah-Hartman 466d9a9cdfbSAlan Stern /** 467523ded71SAlan Stern * device_schedule_callback_owner - helper to schedule a callback for a device 468d9a9cdfbSAlan Stern * @dev: device. 469d9a9cdfbSAlan Stern * @func: callback function to invoke later. 470523ded71SAlan Stern * @owner: module owning the callback routine 471d9a9cdfbSAlan Stern * 472d9a9cdfbSAlan Stern * Attribute methods must not unregister themselves or their parent device 473d9a9cdfbSAlan Stern * (which would amount to the same thing). Attempts to do so will deadlock, 474d9a9cdfbSAlan Stern * since unregistration is mutually exclusive with driver callbacks. 475d9a9cdfbSAlan Stern * 476d9a9cdfbSAlan Stern * Instead methods can call this routine, which will attempt to allocate 477d9a9cdfbSAlan Stern * and schedule a workqueue request to call back @func with @dev as its 478d9a9cdfbSAlan Stern * argument in the workqueue's process context. @dev will be pinned until 479d9a9cdfbSAlan Stern * @func returns. 480d9a9cdfbSAlan Stern * 481523ded71SAlan Stern * This routine is usually called via the inline device_schedule_callback(), 482523ded71SAlan Stern * which automatically sets @owner to THIS_MODULE. 483523ded71SAlan Stern * 484d9a9cdfbSAlan Stern * Returns 0 if the request was submitted, -ENOMEM if storage could not 485523ded71SAlan Stern * be allocated, -ENODEV if a reference to @owner isn't available. 486d9a9cdfbSAlan Stern * 487d9a9cdfbSAlan Stern * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an 488d9a9cdfbSAlan Stern * underlying sysfs routine (since it is intended for use by attribute 489d9a9cdfbSAlan Stern * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. 490d9a9cdfbSAlan Stern */ 491523ded71SAlan Stern int device_schedule_callback_owner(struct device *dev, 492523ded71SAlan Stern void (*func)(struct device *), struct module *owner) 493d9a9cdfbSAlan Stern { 494d9a9cdfbSAlan Stern return sysfs_schedule_callback(&dev->kobj, 495523ded71SAlan Stern (void (*)(void *)) func, dev, owner); 496d9a9cdfbSAlan Stern } 497523ded71SAlan Stern EXPORT_SYMBOL_GPL(device_schedule_callback_owner); 498d9a9cdfbSAlan Stern 49934bb61f9SJames Bottomley static void klist_children_get(struct klist_node *n) 50034bb61f9SJames Bottomley { 50134bb61f9SJames Bottomley struct device *dev = container_of(n, struct device, knode_parent); 50234bb61f9SJames Bottomley 50334bb61f9SJames Bottomley get_device(dev); 50434bb61f9SJames Bottomley } 50534bb61f9SJames Bottomley 50634bb61f9SJames Bottomley static void klist_children_put(struct klist_node *n) 50734bb61f9SJames Bottomley { 50834bb61f9SJames Bottomley struct device *dev = container_of(n, struct device, knode_parent); 50934bb61f9SJames Bottomley 51034bb61f9SJames Bottomley put_device(dev); 51134bb61f9SJames Bottomley } 51234bb61f9SJames Bottomley 5131da177e4SLinus Torvalds 5141da177e4SLinus Torvalds /** 5151da177e4SLinus Torvalds * device_initialize - init device structure. 5161da177e4SLinus Torvalds * @dev: device. 5171da177e4SLinus Torvalds * 5181da177e4SLinus Torvalds * This prepares the device for use by other layers, 5191da177e4SLinus Torvalds * including adding it to the device hierarchy. 5201da177e4SLinus Torvalds * It is the first half of device_register(), if called by 5211da177e4SLinus Torvalds * that, though it can also be called separately, so one 5221da177e4SLinus Torvalds * may use @dev's fields (e.g. the refcount). 5231da177e4SLinus Torvalds */ 5241da177e4SLinus Torvalds 5251da177e4SLinus Torvalds void device_initialize(struct device *dev) 5261da177e4SLinus Torvalds { 527881c6cfdSGreg Kroah-Hartman dev->kobj.kset = devices_kset; 5289990513cSGreg Kroah-Hartman kobject_init_ng(&dev->kobj, &device_ktype); 52934bb61f9SJames Bottomley klist_init(&dev->klist_children, klist_children_get, 53034bb61f9SJames Bottomley klist_children_put); 5311da177e4SLinus Torvalds INIT_LIST_HEAD(&dev->dma_pools); 53223681e47SGreg Kroah-Hartman INIT_LIST_HEAD(&dev->node); 533af70316aSmochel@digitalimplant.org init_MUTEX(&dev->sem); 5349ac7849eSTejun Heo spin_lock_init(&dev->devres_lock); 5359ac7849eSTejun Heo INIT_LIST_HEAD(&dev->devres_head); 5360ac85241SDavid Brownell device_init_wakeup(dev, 0); 53787348136SChristoph Hellwig set_dev_node(dev, -1); 5381da177e4SLinus Torvalds } 5391da177e4SLinus Torvalds 54040fa5422SGreg Kroah-Hartman #ifdef CONFIG_SYSFS_DEPRECATED 541c744aeaeSCornelia Huck static struct kobject *get_device_parent(struct device *dev, 542c744aeaeSCornelia Huck struct device *parent) 54340fa5422SGreg Kroah-Hartman { 544da231fd5SKay Sievers /* class devices without a parent live in /sys/class/<classname>/ */ 5453eb215deSDmitry Torokhov if (dev->class && (!parent || parent->class != dev->class)) 546823bccfcSGreg Kroah-Hartman return &dev->class->subsys.kobj; 547da231fd5SKay Sievers /* all other devices keep their parent */ 54840fa5422SGreg Kroah-Hartman else if (parent) 549c744aeaeSCornelia Huck return &parent->kobj; 55040fa5422SGreg Kroah-Hartman 551c744aeaeSCornelia Huck return NULL; 55240fa5422SGreg Kroah-Hartman } 553da231fd5SKay Sievers 554da231fd5SKay Sievers static inline void cleanup_device_parent(struct device *dev) {} 55540fa5422SGreg Kroah-Hartman #else 556c744aeaeSCornelia Huck static struct kobject *virtual_device_parent(struct device *dev) 557f0ee61a6SGreg Kroah-Hartman { 558f0ee61a6SGreg Kroah-Hartman static struct kobject *virtual_dir = NULL; 559f0ee61a6SGreg Kroah-Hartman 560f0ee61a6SGreg Kroah-Hartman if (!virtual_dir) 5614ff6abffSGreg Kroah-Hartman virtual_dir = kobject_create_and_add("virtual", 562881c6cfdSGreg Kroah-Hartman &devices_kset->kobj); 563f0ee61a6SGreg Kroah-Hartman 56486406245SKay Sievers return virtual_dir; 565f0ee61a6SGreg Kroah-Hartman } 566f0ee61a6SGreg Kroah-Hartman 567c744aeaeSCornelia Huck static struct kobject *get_device_parent(struct device *dev, 568c744aeaeSCornelia Huck struct device *parent) 56940fa5422SGreg Kroah-Hartman { 57043968d2fSGreg Kroah-Hartman int retval; 57143968d2fSGreg Kroah-Hartman 57286406245SKay Sievers if (dev->class) { 57386406245SKay Sievers struct kobject *kobj = NULL; 57486406245SKay Sievers struct kobject *parent_kobj; 57586406245SKay Sievers struct kobject *k; 57686406245SKay Sievers 57786406245SKay Sievers /* 57886406245SKay Sievers * If we have no parent, we live in "virtual". 57986406245SKay Sievers * Class-devices with a bus-device as parent, live 58086406245SKay Sievers * in a class-directory to prevent namespace collisions. 58186406245SKay Sievers */ 58286406245SKay Sievers if (parent == NULL) 58386406245SKay Sievers parent_kobj = virtual_device_parent(dev); 58486406245SKay Sievers else if (parent->class) 58586406245SKay Sievers return &parent->kobj; 58686406245SKay Sievers else 58786406245SKay Sievers parent_kobj = &parent->kobj; 58886406245SKay Sievers 58986406245SKay Sievers /* find our class-directory at the parent and reference it */ 59086406245SKay Sievers spin_lock(&dev->class->class_dirs.list_lock); 59186406245SKay Sievers list_for_each_entry(k, &dev->class->class_dirs.list, entry) 59286406245SKay Sievers if (k->parent == parent_kobj) { 59386406245SKay Sievers kobj = kobject_get(k); 59486406245SKay Sievers break; 59586406245SKay Sievers } 59686406245SKay Sievers spin_unlock(&dev->class->class_dirs.list_lock); 59786406245SKay Sievers if (kobj) 59886406245SKay Sievers return kobj; 59986406245SKay Sievers 60086406245SKay Sievers /* or create a new class-directory at the parent device */ 60143968d2fSGreg Kroah-Hartman k = kobject_create(); 60243968d2fSGreg Kroah-Hartman if (!k) 60343968d2fSGreg Kroah-Hartman return NULL; 60443968d2fSGreg Kroah-Hartman k->kset = &dev->class->class_dirs; 605*b2d6db58SGreg Kroah-Hartman retval = kobject_add(k, parent_kobj, "%s", dev->class->name); 60643968d2fSGreg Kroah-Hartman if (retval < 0) { 60743968d2fSGreg Kroah-Hartman kobject_put(k); 60843968d2fSGreg Kroah-Hartman return NULL; 60943968d2fSGreg Kroah-Hartman } 61043968d2fSGreg Kroah-Hartman /* Do not emit a uevent, as it's not needed for this 61143968d2fSGreg Kroah-Hartman * "class glue" directory. */ 61243968d2fSGreg Kroah-Hartman return k; 61386406245SKay Sievers } 61486406245SKay Sievers 61586406245SKay Sievers if (parent) 616c744aeaeSCornelia Huck return &parent->kobj; 617c744aeaeSCornelia Huck return NULL; 618c744aeaeSCornelia Huck } 619da231fd5SKay Sievers 620da231fd5SKay Sievers static void cleanup_device_parent(struct device *dev) 621da231fd5SKay Sievers { 622da231fd5SKay Sievers struct device *d; 623da231fd5SKay Sievers int other = 0; 624da231fd5SKay Sievers 625da231fd5SKay Sievers if (!dev->class) 626da231fd5SKay Sievers return; 627da231fd5SKay Sievers 628da231fd5SKay Sievers /* see if we live in a parent class directory */ 629da231fd5SKay Sievers if (dev->kobj.parent->kset != &dev->class->class_dirs) 630da231fd5SKay Sievers return; 631da231fd5SKay Sievers 632da231fd5SKay Sievers /* if we are the last child of our class, delete the directory */ 633da231fd5SKay Sievers down(&dev->class->sem); 634da231fd5SKay Sievers list_for_each_entry(d, &dev->class->devices, node) { 635da231fd5SKay Sievers if (d == dev) 636da231fd5SKay Sievers continue; 637da231fd5SKay Sievers if (d->kobj.parent == dev->kobj.parent) { 638da231fd5SKay Sievers other = 1; 639da231fd5SKay Sievers break; 640da231fd5SKay Sievers } 641da231fd5SKay Sievers } 642da231fd5SKay Sievers if (!other) 643da231fd5SKay Sievers kobject_del(dev->kobj.parent); 644da231fd5SKay Sievers kobject_put(dev->kobj.parent); 645da231fd5SKay Sievers up(&dev->class->sem); 646da231fd5SKay Sievers } 647c744aeaeSCornelia Huck #endif 64886406245SKay Sievers 649c744aeaeSCornelia Huck static int 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 (IS_ERR(kobj)) 654c744aeaeSCornelia Huck return PTR_ERR(kobj); 655c744aeaeSCornelia Huck if (kobj) 656c744aeaeSCornelia Huck dev->kobj.parent = kobj; 65740fa5422SGreg Kroah-Hartman return 0; 65840fa5422SGreg Kroah-Hartman } 65940fa5422SGreg Kroah-Hartman 6602ee97cafSCornelia Huck static int device_add_class_symlinks(struct device *dev) 6612ee97cafSCornelia Huck { 6622ee97cafSCornelia Huck int error; 6632ee97cafSCornelia Huck 6642ee97cafSCornelia Huck if (!dev->class) 6652ee97cafSCornelia Huck return 0; 666da231fd5SKay Sievers 6672ee97cafSCornelia Huck error = sysfs_create_link(&dev->kobj, &dev->class->subsys.kobj, 6682ee97cafSCornelia Huck "subsystem"); 6692ee97cafSCornelia Huck if (error) 6702ee97cafSCornelia Huck goto out; 671da231fd5SKay Sievers 672da231fd5SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 673da231fd5SKay Sievers /* stacked class devices need a symlink in the class directory */ 674edfaa7c3SKay Sievers if (dev->kobj.parent != &dev->class->subsys.kobj && 675edfaa7c3SKay Sievers dev->type != &part_type) { 6762ee97cafSCornelia Huck error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, 6772ee97cafSCornelia Huck dev->bus_id); 6782ee97cafSCornelia Huck if (error) 6792ee97cafSCornelia Huck goto out_subsys; 6802ee97cafSCornelia Huck } 681da231fd5SKay Sievers 682edfaa7c3SKay Sievers if (dev->parent && dev->type != &part_type) { 6834f01a757SDmitry Torokhov struct device *parent = dev->parent; 6844f01a757SDmitry Torokhov char *class_name; 6854f01a757SDmitry Torokhov 6864f01a757SDmitry Torokhov /* 687da231fd5SKay Sievers * stacked class devices have the 'device' link 688da231fd5SKay Sievers * pointing to the bus device instead of the parent 6894f01a757SDmitry Torokhov */ 6904f01a757SDmitry Torokhov while (parent->class && !parent->bus && parent->parent) 6914f01a757SDmitry Torokhov parent = parent->parent; 6924f01a757SDmitry Torokhov 6934f01a757SDmitry Torokhov error = sysfs_create_link(&dev->kobj, 6944f01a757SDmitry Torokhov &parent->kobj, 6952ee97cafSCornelia Huck "device"); 6962ee97cafSCornelia Huck if (error) 6972ee97cafSCornelia Huck goto out_busid; 6984f01a757SDmitry Torokhov 6994f01a757SDmitry Torokhov class_name = make_class_name(dev->class->name, 7002ee97cafSCornelia Huck &dev->kobj); 7012ee97cafSCornelia Huck if (class_name) 7022ee97cafSCornelia Huck error = sysfs_create_link(&dev->parent->kobj, 7032ee97cafSCornelia Huck &dev->kobj, class_name); 7042ee97cafSCornelia Huck kfree(class_name); 7052ee97cafSCornelia Huck if (error) 7062ee97cafSCornelia Huck goto out_device; 7072ee97cafSCornelia Huck } 708da231fd5SKay Sievers return 0; 709da231fd5SKay Sievers 710da231fd5SKay Sievers out_device: 711edfaa7c3SKay Sievers if (dev->parent && dev->type != &part_type) 712da231fd5SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 713da231fd5SKay Sievers out_busid: 714edfaa7c3SKay Sievers if (dev->kobj.parent != &dev->class->subsys.kobj && 715edfaa7c3SKay Sievers dev->type != &part_type) 716da231fd5SKay Sievers sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); 7174f01a757SDmitry Torokhov #else 718da231fd5SKay Sievers /* link in the class directory pointing to the device */ 719da231fd5SKay Sievers error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, 720da231fd5SKay Sievers dev->bus_id); 721da231fd5SKay Sievers if (error) 722da231fd5SKay Sievers goto out_subsys; 723da231fd5SKay Sievers 724edfaa7c3SKay Sievers if (dev->parent && dev->type != &part_type) { 7254f01a757SDmitry Torokhov error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, 7264f01a757SDmitry Torokhov "device"); 7274f01a757SDmitry Torokhov if (error) 7284f01a757SDmitry Torokhov goto out_busid; 7292ee97cafSCornelia Huck } 7302ee97cafSCornelia Huck return 0; 7312ee97cafSCornelia Huck 7322ee97cafSCornelia Huck out_busid: 7332ee97cafSCornelia Huck sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); 734da231fd5SKay Sievers #endif 735da231fd5SKay Sievers 7362ee97cafSCornelia Huck out_subsys: 7372ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 7382ee97cafSCornelia Huck out: 7392ee97cafSCornelia Huck return error; 7402ee97cafSCornelia Huck } 7412ee97cafSCornelia Huck 7422ee97cafSCornelia Huck static void device_remove_class_symlinks(struct device *dev) 7432ee97cafSCornelia Huck { 7442ee97cafSCornelia Huck if (!dev->class) 7452ee97cafSCornelia Huck return; 746da231fd5SKay Sievers 7472ee97cafSCornelia Huck #ifdef CONFIG_SYSFS_DEPRECATED 748edfaa7c3SKay Sievers if (dev->parent && dev->type != &part_type) { 7492ee97cafSCornelia Huck char *class_name; 7502ee97cafSCornelia Huck 7512ee97cafSCornelia Huck class_name = make_class_name(dev->class->name, &dev->kobj); 7522ee97cafSCornelia Huck if (class_name) { 7532ee97cafSCornelia Huck sysfs_remove_link(&dev->parent->kobj, class_name); 7542ee97cafSCornelia Huck kfree(class_name); 7552ee97cafSCornelia Huck } 7562ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 7572ee97cafSCornelia Huck } 758da231fd5SKay Sievers 759edfaa7c3SKay Sievers if (dev->kobj.parent != &dev->class->subsys.kobj && 760edfaa7c3SKay Sievers dev->type != &part_type) 7612ee97cafSCornelia Huck sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); 762da231fd5SKay Sievers #else 763edfaa7c3SKay Sievers if (dev->parent && dev->type != &part_type) 764da231fd5SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 765da231fd5SKay Sievers 766da231fd5SKay Sievers sysfs_remove_link(&dev->class->subsys.kobj, dev->bus_id); 767da231fd5SKay Sievers #endif 768da231fd5SKay Sievers 7692ee97cafSCornelia Huck sysfs_remove_link(&dev->kobj, "subsystem"); 7702ee97cafSCornelia Huck } 7712ee97cafSCornelia Huck 7721da177e4SLinus Torvalds /** 7731da177e4SLinus Torvalds * device_add - add device to device hierarchy. 7741da177e4SLinus Torvalds * @dev: device. 7751da177e4SLinus Torvalds * 7761da177e4SLinus Torvalds * This is part 2 of device_register(), though may be called 7771da177e4SLinus Torvalds * separately _iff_ device_initialize() has been called separately. 7781da177e4SLinus Torvalds * 779*b2d6db58SGreg Kroah-Hartman * This adds it to the kobject hierarchy via kobject_add(), adds it 7801da177e4SLinus Torvalds * to the global and sibling lists for the device, then 7811da177e4SLinus Torvalds * adds it to the other relevant subsystems of the driver model. 7821da177e4SLinus Torvalds */ 7831da177e4SLinus Torvalds int device_add(struct device *dev) 7841da177e4SLinus Torvalds { 7851da177e4SLinus Torvalds struct device *parent = NULL; 786c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 787775b64d2SRafael J. Wysocki int error; 788775b64d2SRafael J. Wysocki 789775b64d2SRafael J. Wysocki error = pm_sleep_lock(); 790775b64d2SRafael J. Wysocki if (error) { 791775b64d2SRafael J. Wysocki dev_warn(dev, "Suspicious %s during suspend\n", __FUNCTION__); 792775b64d2SRafael J. Wysocki dump_stack(); 793775b64d2SRafael J. Wysocki return error; 794775b64d2SRafael J. Wysocki } 7951da177e4SLinus Torvalds 7961da177e4SLinus Torvalds dev = get_device(dev); 797775b64d2SRafael J. Wysocki if (!dev || !strlen(dev->bus_id)) { 798775b64d2SRafael J. Wysocki error = -EINVAL; 7991da177e4SLinus Torvalds goto Error; 800775b64d2SRafael J. Wysocki } 8011da177e4SLinus Torvalds 8027dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); 803c205ef48SGreg Kroah-Hartman 8041da177e4SLinus Torvalds parent = get_device(dev->parent); 80540fa5422SGreg Kroah-Hartman error = setup_parent(dev, parent); 80640fa5422SGreg Kroah-Hartman if (error) 80740fa5422SGreg Kroah-Hartman goto Error; 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvalds /* first, register with generic layer. */ 810*b2d6db58SGreg Kroah-Hartman error = kobject_add(&dev->kobj, dev->kobj.parent, "%s", dev->bus_id); 81140fa5422SGreg Kroah-Hartman if (error) 8121da177e4SLinus Torvalds goto Error; 813a7fd6706SKay Sievers 81437022644SBrian Walsh /* notify platform of device entry */ 81537022644SBrian Walsh if (platform_notify) 81637022644SBrian Walsh platform_notify(dev); 81737022644SBrian Walsh 818116af378SBenjamin Herrenschmidt /* notify clients of device entry (new way) */ 819116af378SBenjamin Herrenschmidt if (dev->bus) 820c6f7e72aSGreg Kroah-Hartman blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 821116af378SBenjamin Herrenschmidt BUS_NOTIFY_ADD_DEVICE, dev); 822116af378SBenjamin Herrenschmidt 823ad6a1e1cSTejun Heo error = device_create_file(dev, &uevent_attr); 824a306eea4SCornelia Huck if (error) 825a306eea4SCornelia Huck goto attrError; 826a7fd6706SKay Sievers 82723681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 828ad6a1e1cSTejun Heo error = device_create_file(dev, &devt_attr); 829ad6a1e1cSTejun Heo if (error) 830a306eea4SCornelia Huck goto ueventattrError; 83123681e47SGreg Kroah-Hartman } 83223681e47SGreg Kroah-Hartman 8332ee97cafSCornelia Huck error = device_add_class_symlinks(dev); 8342ee97cafSCornelia Huck if (error) 8352ee97cafSCornelia Huck goto SymlinkError; 836dc0afa83SCornelia Huck error = device_add_attrs(dev); 837dc0afa83SCornelia Huck if (error) 8382620efefSGreg Kroah-Hartman goto AttrsError; 839dec13c15SDaniel Drake error = dpm_sysfs_add(dev); 840dc0afa83SCornelia Huck if (error) 8411da177e4SLinus Torvalds goto PMError; 842dec13c15SDaniel Drake device_pm_add(dev); 843dc0afa83SCornelia Huck error = bus_add_device(dev); 844dc0afa83SCornelia Huck if (error) 8451da177e4SLinus Torvalds goto BusError; 84653877d06SKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 847c6a46696SCornelia Huck bus_attach_device(dev); 8481da177e4SLinus Torvalds if (parent) 849d856f1e3SJames Bottomley klist_add_tail(&dev->knode_parent, &parent->klist_children); 8501da177e4SLinus Torvalds 8515d9fd169SGreg Kroah-Hartman if (dev->class) { 8525d9fd169SGreg Kroah-Hartman down(&dev->class->sem); 853c47ed219SGreg Kroah-Hartman /* tie the class to the device */ 8545d9fd169SGreg Kroah-Hartman list_add_tail(&dev->node, &dev->class->devices); 855c47ed219SGreg Kroah-Hartman 856c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is here */ 857c47ed219SGreg Kroah-Hartman list_for_each_entry(class_intf, &dev->class->interfaces, node) 858c47ed219SGreg Kroah-Hartman if (class_intf->add_dev) 859c47ed219SGreg Kroah-Hartman class_intf->add_dev(dev, class_intf); 8605d9fd169SGreg Kroah-Hartman up(&dev->class->sem); 8615d9fd169SGreg Kroah-Hartman } 8621da177e4SLinus Torvalds Done: 8631da177e4SLinus Torvalds put_device(dev); 864775b64d2SRafael J. Wysocki pm_sleep_unlock(); 8651da177e4SLinus Torvalds return error; 8661da177e4SLinus Torvalds BusError: 8671da177e4SLinus Torvalds device_pm_remove(dev); 868dec13c15SDaniel Drake dpm_sysfs_remove(dev); 8691da177e4SLinus Torvalds PMError: 870116af378SBenjamin Herrenschmidt if (dev->bus) 871c6f7e72aSGreg Kroah-Hartman blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 872116af378SBenjamin Herrenschmidt BUS_NOTIFY_DEL_DEVICE, dev); 8732620efefSGreg Kroah-Hartman device_remove_attrs(dev); 8742620efefSGreg Kroah-Hartman AttrsError: 8752ee97cafSCornelia Huck device_remove_class_symlinks(dev); 8762ee97cafSCornelia Huck SymlinkError: 877ad6a1e1cSTejun Heo if (MAJOR(dev->devt)) 878ad6a1e1cSTejun Heo device_remove_file(dev, &devt_attr); 879a306eea4SCornelia Huck ueventattrError: 880ad6a1e1cSTejun Heo device_remove_file(dev, &uevent_attr); 88123681e47SGreg Kroah-Hartman attrError: 882312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 8831da177e4SLinus Torvalds kobject_del(&dev->kobj); 8841da177e4SLinus Torvalds Error: 8851da177e4SLinus Torvalds if (parent) 8861da177e4SLinus Torvalds put_device(parent); 8871da177e4SLinus Torvalds goto Done; 8881da177e4SLinus Torvalds } 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds 8911da177e4SLinus Torvalds /** 8921da177e4SLinus Torvalds * device_register - register a device with the system. 8931da177e4SLinus Torvalds * @dev: pointer to the device structure 8941da177e4SLinus Torvalds * 8951da177e4SLinus Torvalds * This happens in two clean steps - initialize the device 8961da177e4SLinus Torvalds * and add it to the system. The two steps can be called 8971da177e4SLinus Torvalds * separately, but this is the easiest and most common. 8981da177e4SLinus Torvalds * I.e. you should only call the two helpers separately if 8991da177e4SLinus Torvalds * have a clearly defined need to use and refcount the device 9001da177e4SLinus Torvalds * before it is added to the hierarchy. 9011da177e4SLinus Torvalds */ 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds int device_register(struct device *dev) 9041da177e4SLinus Torvalds { 9051da177e4SLinus Torvalds device_initialize(dev); 9061da177e4SLinus Torvalds return device_add(dev); 9071da177e4SLinus Torvalds } 9081da177e4SLinus Torvalds 9091da177e4SLinus Torvalds 9101da177e4SLinus Torvalds /** 9111da177e4SLinus Torvalds * get_device - increment reference count for device. 9121da177e4SLinus Torvalds * @dev: device. 9131da177e4SLinus Torvalds * 9141da177e4SLinus Torvalds * This simply forwards the call to kobject_get(), though 9151da177e4SLinus Torvalds * we do take care to provide for the case that we get a NULL 9161da177e4SLinus Torvalds * pointer passed in. 9171da177e4SLinus Torvalds */ 9181da177e4SLinus Torvalds 9191da177e4SLinus Torvalds struct device * get_device(struct device * dev) 9201da177e4SLinus Torvalds { 9211da177e4SLinus Torvalds return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; 9221da177e4SLinus Torvalds } 9231da177e4SLinus Torvalds 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds /** 9261da177e4SLinus Torvalds * put_device - decrement reference count. 9271da177e4SLinus Torvalds * @dev: device in question. 9281da177e4SLinus Torvalds */ 9291da177e4SLinus Torvalds void put_device(struct device * dev) 9301da177e4SLinus Torvalds { 931edfaa7c3SKay Sievers /* might_sleep(); */ 9321da177e4SLinus Torvalds if (dev) 9331da177e4SLinus Torvalds kobject_put(&dev->kobj); 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds 9371da177e4SLinus Torvalds /** 9381da177e4SLinus Torvalds * device_del - delete device from system. 9391da177e4SLinus Torvalds * @dev: device. 9401da177e4SLinus Torvalds * 9411da177e4SLinus Torvalds * This is the first part of the device unregistration 9421da177e4SLinus Torvalds * sequence. This removes the device from the lists we control 9431da177e4SLinus Torvalds * from here, has it removed from the other driver model 9441da177e4SLinus Torvalds * subsystems it was added to in device_add(), and removes it 9451da177e4SLinus Torvalds * from the kobject hierarchy. 9461da177e4SLinus Torvalds * 9471da177e4SLinus Torvalds * NOTE: this should be called manually _iff_ device_add() was 9481da177e4SLinus Torvalds * also called manually. 9491da177e4SLinus Torvalds */ 9501da177e4SLinus Torvalds 9511da177e4SLinus Torvalds void device_del(struct device * dev) 9521da177e4SLinus Torvalds { 9531da177e4SLinus Torvalds struct device * parent = dev->parent; 954c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 9551da177e4SLinus Torvalds 956775b64d2SRafael J. Wysocki device_pm_remove(dev); 9571da177e4SLinus Torvalds if (parent) 958d62c0f9fSPatrick Mochel klist_del(&dev->knode_parent); 959ad6a1e1cSTejun Heo if (MAJOR(dev->devt)) 960ad6a1e1cSTejun Heo device_remove_file(dev, &devt_attr); 961b9d9c82bSKay Sievers if (dev->class) { 962da231fd5SKay Sievers device_remove_class_symlinks(dev); 96399ef3ef8SKay Sievers 9645d9fd169SGreg Kroah-Hartman down(&dev->class->sem); 965c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is now gone */ 966c47ed219SGreg Kroah-Hartman list_for_each_entry(class_intf, &dev->class->interfaces, node) 967c47ed219SGreg Kroah-Hartman if (class_intf->remove_dev) 968c47ed219SGreg Kroah-Hartman class_intf->remove_dev(dev, class_intf); 969c47ed219SGreg Kroah-Hartman /* remove the device from the class list */ 9705d9fd169SGreg Kroah-Hartman list_del_init(&dev->node); 9715d9fd169SGreg Kroah-Hartman up(&dev->class->sem); 972b9d9c82bSKay Sievers } 973ad6a1e1cSTejun Heo device_remove_file(dev, &uevent_attr); 9742620efefSGreg Kroah-Hartman device_remove_attrs(dev); 97528953533SBenjamin Herrenschmidt bus_remove_device(dev); 9761da177e4SLinus Torvalds 9772f8d16a9STejun Heo /* 9782f8d16a9STejun Heo * Some platform devices are driven without driver attached 9792f8d16a9STejun Heo * and managed resources may have been acquired. Make sure 9802f8d16a9STejun Heo * all resources are released. 9812f8d16a9STejun Heo */ 9822f8d16a9STejun Heo devres_release_all(dev); 9832f8d16a9STejun Heo 9841da177e4SLinus Torvalds /* Notify the platform of the removal, in case they 9851da177e4SLinus Torvalds * need to do anything... 9861da177e4SLinus Torvalds */ 9871da177e4SLinus Torvalds if (platform_notify_remove) 9881da177e4SLinus Torvalds platform_notify_remove(dev); 989116af378SBenjamin Herrenschmidt if (dev->bus) 990c6f7e72aSGreg Kroah-Hartman blocking_notifier_call_chain(&dev->bus->p->bus_notifier, 991116af378SBenjamin Herrenschmidt BUS_NOTIFY_DEL_DEVICE, dev); 992312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 993da231fd5SKay Sievers cleanup_device_parent(dev); 9941da177e4SLinus Torvalds kobject_del(&dev->kobj); 9951da177e4SLinus Torvalds put_device(parent); 9961da177e4SLinus Torvalds } 9971da177e4SLinus Torvalds 9981da177e4SLinus Torvalds /** 9991da177e4SLinus Torvalds * device_unregister - unregister device from system. 10001da177e4SLinus Torvalds * @dev: device going away. 10011da177e4SLinus Torvalds * 10021da177e4SLinus Torvalds * We do this in two parts, like we do device_register(). First, 10031da177e4SLinus Torvalds * we remove it from all the subsystems with device_del(), then 10041da177e4SLinus Torvalds * we decrement the reference count via put_device(). If that 10051da177e4SLinus Torvalds * is the final reference count, the device will be cleaned up 10061da177e4SLinus Torvalds * via device_release() above. Otherwise, the structure will 10071da177e4SLinus Torvalds * stick around until the final reference to the device is dropped. 10081da177e4SLinus Torvalds */ 10091da177e4SLinus Torvalds void device_unregister(struct device * dev) 10101da177e4SLinus Torvalds { 10117dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); 10121da177e4SLinus Torvalds device_del(dev); 10131da177e4SLinus Torvalds put_device(dev); 10141da177e4SLinus Torvalds } 10151da177e4SLinus Torvalds 10161da177e4SLinus Torvalds 101736239577Smochel@digitalimplant.org static struct device * next_device(struct klist_iter * i) 101836239577Smochel@digitalimplant.org { 101936239577Smochel@digitalimplant.org struct klist_node * n = klist_next(i); 102036239577Smochel@digitalimplant.org return n ? container_of(n, struct device, knode_parent) : NULL; 102136239577Smochel@digitalimplant.org } 102236239577Smochel@digitalimplant.org 10231da177e4SLinus Torvalds /** 10241da177e4SLinus Torvalds * device_for_each_child - device child iterator. 1025c41455fbSRandy Dunlap * @parent: parent struct device. 10261da177e4SLinus Torvalds * @data: data for the callback. 10271da177e4SLinus Torvalds * @fn: function to be called for each device. 10281da177e4SLinus Torvalds * 1029c41455fbSRandy Dunlap * Iterate over @parent's child devices, and call @fn for each, 10301da177e4SLinus Torvalds * passing it @data. 10311da177e4SLinus Torvalds * 10321da177e4SLinus Torvalds * We check the return of @fn each time. If it returns anything 10331da177e4SLinus Torvalds * other than 0, we break out and return that value. 10341da177e4SLinus Torvalds */ 103536239577Smochel@digitalimplant.org int device_for_each_child(struct device * parent, void * data, 10361da177e4SLinus Torvalds int (*fn)(struct device *, void *)) 10371da177e4SLinus Torvalds { 103836239577Smochel@digitalimplant.org struct klist_iter i; 10391da177e4SLinus Torvalds struct device * child; 10401da177e4SLinus Torvalds int error = 0; 10411da177e4SLinus Torvalds 104236239577Smochel@digitalimplant.org klist_iter_init(&parent->klist_children, &i); 104336239577Smochel@digitalimplant.org while ((child = next_device(&i)) && !error) 104436239577Smochel@digitalimplant.org error = fn(child, data); 104536239577Smochel@digitalimplant.org klist_iter_exit(&i); 10461da177e4SLinus Torvalds return error; 10471da177e4SLinus Torvalds } 10481da177e4SLinus Torvalds 10495ab69981SCornelia Huck /** 10505ab69981SCornelia Huck * device_find_child - device iterator for locating a particular device. 10515ab69981SCornelia Huck * @parent: parent struct device 10525ab69981SCornelia Huck * @data: Data to pass to match function 10535ab69981SCornelia Huck * @match: Callback function to check device 10545ab69981SCornelia Huck * 10555ab69981SCornelia Huck * This is similar to the device_for_each_child() function above, but it 10565ab69981SCornelia Huck * returns a reference to a device that is 'found' for later use, as 10575ab69981SCornelia Huck * determined by the @match callback. 10585ab69981SCornelia Huck * 10595ab69981SCornelia Huck * The callback should return 0 if the device doesn't match and non-zero 10605ab69981SCornelia Huck * if it does. If the callback returns non-zero and a reference to the 10615ab69981SCornelia Huck * current device can be obtained, this function will return to the caller 10625ab69981SCornelia Huck * and not iterate over any more devices. 10635ab69981SCornelia Huck */ 10645ab69981SCornelia Huck struct device * device_find_child(struct device *parent, void *data, 10655ab69981SCornelia Huck int (*match)(struct device *, void *)) 10665ab69981SCornelia Huck { 10675ab69981SCornelia Huck struct klist_iter i; 10685ab69981SCornelia Huck struct device *child; 10695ab69981SCornelia Huck 10705ab69981SCornelia Huck if (!parent) 10715ab69981SCornelia Huck return NULL; 10725ab69981SCornelia Huck 10735ab69981SCornelia Huck klist_iter_init(&parent->klist_children, &i); 10745ab69981SCornelia Huck while ((child = next_device(&i))) 10755ab69981SCornelia Huck if (match(child, data) && get_device(child)) 10765ab69981SCornelia Huck break; 10775ab69981SCornelia Huck klist_iter_exit(&i); 10785ab69981SCornelia Huck return child; 10795ab69981SCornelia Huck } 10805ab69981SCornelia Huck 10811da177e4SLinus Torvalds int __init devices_init(void) 10821da177e4SLinus Torvalds { 1083881c6cfdSGreg Kroah-Hartman devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); 1084881c6cfdSGreg Kroah-Hartman if (!devices_kset) 1085881c6cfdSGreg Kroah-Hartman return -ENOMEM; 1086881c6cfdSGreg Kroah-Hartman return 0; 10871da177e4SLinus Torvalds } 10881da177e4SLinus Torvalds 10891da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_for_each_child); 10905ab69981SCornelia Huck EXPORT_SYMBOL_GPL(device_find_child); 10911da177e4SLinus Torvalds 10921da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_initialize); 10931da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_add); 10941da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_register); 10951da177e4SLinus Torvalds 10961da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_del); 10971da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_unregister); 10981da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(get_device); 10991da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(put_device); 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_create_file); 11021da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_remove_file); 110323681e47SGreg Kroah-Hartman 110423681e47SGreg Kroah-Hartman 110523681e47SGreg Kroah-Hartman static void device_create_release(struct device *dev) 110623681e47SGreg Kroah-Hartman { 11077dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s\n", dev->bus_id, __FUNCTION__); 110823681e47SGreg Kroah-Hartman kfree(dev); 110923681e47SGreg Kroah-Hartman } 111023681e47SGreg Kroah-Hartman 111123681e47SGreg Kroah-Hartman /** 111223681e47SGreg Kroah-Hartman * device_create - creates a device and registers it with sysfs 111342734dafSHenrik Kretzschmar * @class: pointer to the struct class that this device should be registered to 111442734dafSHenrik Kretzschmar * @parent: pointer to the parent struct device of this new device, if any 111542734dafSHenrik Kretzschmar * @devt: the dev_t for the char device to be added 111642734dafSHenrik Kretzschmar * @fmt: string for the device's name 111723681e47SGreg Kroah-Hartman * 111842734dafSHenrik Kretzschmar * This function can be used by char device classes. A struct device 111942734dafSHenrik Kretzschmar * will be created in sysfs, registered to the specified class. 112042734dafSHenrik Kretzschmar * 112123681e47SGreg Kroah-Hartman * A "dev" file will be created, showing the dev_t for the device, if 112223681e47SGreg Kroah-Hartman * the dev_t is not 0,0. 112342734dafSHenrik Kretzschmar * If a pointer to a parent struct device is passed in, the newly created 112442734dafSHenrik Kretzschmar * struct device will be a child of that device in sysfs. 112542734dafSHenrik Kretzschmar * The pointer to the struct device will be returned from the call. 112642734dafSHenrik Kretzschmar * Any further sysfs files that might be required can be created using this 112723681e47SGreg Kroah-Hartman * pointer. 112823681e47SGreg Kroah-Hartman * 112923681e47SGreg Kroah-Hartman * Note: the struct class passed to this function must have previously 113023681e47SGreg Kroah-Hartman * been created with a call to class_create(). 113123681e47SGreg Kroah-Hartman */ 113223681e47SGreg Kroah-Hartman struct device *device_create(struct class *class, struct device *parent, 11335cbe5f8aSGreg Kroah-Hartman dev_t devt, const char *fmt, ...) 113423681e47SGreg Kroah-Hartman { 113523681e47SGreg Kroah-Hartman va_list args; 113623681e47SGreg Kroah-Hartman struct device *dev = NULL; 113723681e47SGreg Kroah-Hartman int retval = -ENODEV; 113823681e47SGreg Kroah-Hartman 113923681e47SGreg Kroah-Hartman if (class == NULL || IS_ERR(class)) 114023681e47SGreg Kroah-Hartman goto error; 114123681e47SGreg Kroah-Hartman 114223681e47SGreg Kroah-Hartman dev = kzalloc(sizeof(*dev), GFP_KERNEL); 114323681e47SGreg Kroah-Hartman if (!dev) { 114423681e47SGreg Kroah-Hartman retval = -ENOMEM; 114523681e47SGreg Kroah-Hartman goto error; 114623681e47SGreg Kroah-Hartman } 114723681e47SGreg Kroah-Hartman 114823681e47SGreg Kroah-Hartman dev->devt = devt; 114923681e47SGreg Kroah-Hartman dev->class = class; 115023681e47SGreg Kroah-Hartman dev->parent = parent; 115123681e47SGreg Kroah-Hartman dev->release = device_create_release; 115223681e47SGreg Kroah-Hartman 115323681e47SGreg Kroah-Hartman va_start(args, fmt); 115423681e47SGreg Kroah-Hartman vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); 115523681e47SGreg Kroah-Hartman va_end(args); 115623681e47SGreg Kroah-Hartman retval = device_register(dev); 115723681e47SGreg Kroah-Hartman if (retval) 115823681e47SGreg Kroah-Hartman goto error; 115923681e47SGreg Kroah-Hartman 116023681e47SGreg Kroah-Hartman return dev; 116123681e47SGreg Kroah-Hartman 116223681e47SGreg Kroah-Hartman error: 116323681e47SGreg Kroah-Hartman kfree(dev); 116423681e47SGreg Kroah-Hartman return ERR_PTR(retval); 116523681e47SGreg Kroah-Hartman } 116623681e47SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create); 116723681e47SGreg Kroah-Hartman 116823681e47SGreg Kroah-Hartman /** 1169775b64d2SRafael J. Wysocki * find_device - finds a device that was created with device_create() 117042734dafSHenrik Kretzschmar * @class: pointer to the struct class that this device was registered with 117142734dafSHenrik Kretzschmar * @devt: the dev_t of the device that was previously registered 117223681e47SGreg Kroah-Hartman */ 1173775b64d2SRafael J. Wysocki static struct device *find_device(struct class *class, dev_t devt) 117423681e47SGreg Kroah-Hartman { 117523681e47SGreg Kroah-Hartman struct device *dev = NULL; 117623681e47SGreg Kroah-Hartman struct device *dev_tmp; 117723681e47SGreg Kroah-Hartman 117823681e47SGreg Kroah-Hartman down(&class->sem); 117923681e47SGreg Kroah-Hartman list_for_each_entry(dev_tmp, &class->devices, node) { 118023681e47SGreg Kroah-Hartman if (dev_tmp->devt == devt) { 118123681e47SGreg Kroah-Hartman dev = dev_tmp; 118223681e47SGreg Kroah-Hartman break; 118323681e47SGreg Kroah-Hartman } 118423681e47SGreg Kroah-Hartman } 118523681e47SGreg Kroah-Hartman up(&class->sem); 1186775b64d2SRafael J. Wysocki return dev; 1187775b64d2SRafael J. Wysocki } 118823681e47SGreg Kroah-Hartman 1189775b64d2SRafael J. Wysocki /** 1190775b64d2SRafael J. Wysocki * device_destroy - removes a device that was created with device_create() 1191775b64d2SRafael J. Wysocki * @class: pointer to the struct class that this device was registered with 1192775b64d2SRafael J. Wysocki * @devt: the dev_t of the device that was previously registered 1193775b64d2SRafael J. Wysocki * 1194775b64d2SRafael J. Wysocki * This call unregisters and cleans up a device that was created with a 1195775b64d2SRafael J. Wysocki * call to device_create(). 1196775b64d2SRafael J. Wysocki */ 1197775b64d2SRafael J. Wysocki void device_destroy(struct class *class, dev_t devt) 1198775b64d2SRafael J. Wysocki { 1199775b64d2SRafael J. Wysocki struct device *dev; 1200775b64d2SRafael J. Wysocki 1201775b64d2SRafael J. Wysocki dev = find_device(class, devt); 12025d9fd169SGreg Kroah-Hartman if (dev) 120323681e47SGreg Kroah-Hartman device_unregister(dev); 120423681e47SGreg Kroah-Hartman } 120523681e47SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_destroy); 1206a2de48caSGreg Kroah-Hartman 1207775b64d2SRafael J. Wysocki #ifdef CONFIG_PM_SLEEP 1208775b64d2SRafael J. Wysocki /** 1209775b64d2SRafael J. Wysocki * destroy_suspended_device - asks the PM core to remove a suspended device 1210775b64d2SRafael J. Wysocki * @class: pointer to the struct class that this device was registered with 1211775b64d2SRafael J. Wysocki * @devt: the dev_t of the device that was previously registered 1212775b64d2SRafael J. Wysocki * 1213775b64d2SRafael J. Wysocki * This call notifies the PM core of the necessity to unregister a suspended 1214775b64d2SRafael J. Wysocki * device created with a call to device_create() (devices cannot be 1215775b64d2SRafael J. Wysocki * unregistered directly while suspended, since the PM core holds their 1216775b64d2SRafael J. Wysocki * semaphores at that time). 1217775b64d2SRafael J. Wysocki * 1218775b64d2SRafael J. Wysocki * It can only be called within the scope of a system sleep transition. In 1219775b64d2SRafael J. Wysocki * practice this means it has to be directly or indirectly invoked either by 1220775b64d2SRafael J. Wysocki * a suspend or resume method, or by the PM core (e.g. via 1221775b64d2SRafael J. Wysocki * disable_nonboot_cpus() or enable_nonboot_cpus()). 1222775b64d2SRafael J. Wysocki */ 1223775b64d2SRafael J. Wysocki void destroy_suspended_device(struct class *class, dev_t devt) 1224775b64d2SRafael J. Wysocki { 1225775b64d2SRafael J. Wysocki struct device *dev; 1226775b64d2SRafael J. Wysocki 1227775b64d2SRafael J. Wysocki dev = find_device(class, devt); 1228775b64d2SRafael J. Wysocki if (dev) 1229775b64d2SRafael J. Wysocki device_pm_schedule_removal(dev); 1230775b64d2SRafael J. Wysocki } 1231775b64d2SRafael J. Wysocki EXPORT_SYMBOL_GPL(destroy_suspended_device); 1232775b64d2SRafael J. Wysocki #endif /* CONFIG_PM_SLEEP */ 1233775b64d2SRafael J. Wysocki 1234a2de48caSGreg Kroah-Hartman /** 1235a2de48caSGreg Kroah-Hartman * device_rename - renames a device 1236a2de48caSGreg Kroah-Hartman * @dev: the pointer to the struct device to be renamed 1237a2de48caSGreg Kroah-Hartman * @new_name: the new name of the device 1238a2de48caSGreg Kroah-Hartman */ 1239a2de48caSGreg Kroah-Hartman int device_rename(struct device *dev, char *new_name) 1240a2de48caSGreg Kroah-Hartman { 1241a2de48caSGreg Kroah-Hartman char *old_class_name = NULL; 1242a2de48caSGreg Kroah-Hartman char *new_class_name = NULL; 12432ee97cafSCornelia Huck char *old_device_name = NULL; 1244a2de48caSGreg Kroah-Hartman int error; 1245a2de48caSGreg Kroah-Hartman 1246a2de48caSGreg Kroah-Hartman dev = get_device(dev); 1247a2de48caSGreg Kroah-Hartman if (!dev) 1248a2de48caSGreg Kroah-Hartman return -EINVAL; 1249a2de48caSGreg Kroah-Hartman 12507dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: renaming to '%s'\n", dev->bus_id, 12517dc72b28SGreg Kroah-Hartman __FUNCTION__, new_name); 1252a2de48caSGreg Kroah-Hartman 125399ef3ef8SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 1254a2de48caSGreg Kroah-Hartman if ((dev->class) && (dev->parent)) 1255a2de48caSGreg Kroah-Hartman old_class_name = make_class_name(dev->class->name, &dev->kobj); 125699ef3ef8SKay Sievers #endif 1257a2de48caSGreg Kroah-Hartman 12582ee97cafSCornelia Huck old_device_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); 12592ee97cafSCornelia Huck if (!old_device_name) { 1260952ab431SJesper Juhl error = -ENOMEM; 12612ee97cafSCornelia Huck goto out; 1262952ab431SJesper Juhl } 12632ee97cafSCornelia Huck strlcpy(old_device_name, dev->bus_id, BUS_ID_SIZE); 1264a2de48caSGreg Kroah-Hartman strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); 1265a2de48caSGreg Kroah-Hartman 1266a2de48caSGreg Kroah-Hartman error = kobject_rename(&dev->kobj, new_name); 12672ee97cafSCornelia Huck if (error) { 12682ee97cafSCornelia Huck strlcpy(dev->bus_id, old_device_name, BUS_ID_SIZE); 12692ee97cafSCornelia Huck goto out; 12702ee97cafSCornelia Huck } 1271a2de48caSGreg Kroah-Hartman 127299ef3ef8SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 1273a2de48caSGreg Kroah-Hartman if (old_class_name) { 1274a2de48caSGreg Kroah-Hartman new_class_name = make_class_name(dev->class->name, &dev->kobj); 1275a2de48caSGreg Kroah-Hartman if (new_class_name) { 12762ee97cafSCornelia Huck error = sysfs_create_link(&dev->parent->kobj, 12772ee97cafSCornelia Huck &dev->kobj, new_class_name); 12782ee97cafSCornelia Huck if (error) 12792ee97cafSCornelia Huck goto out; 1280a2de48caSGreg Kroah-Hartman sysfs_remove_link(&dev->parent->kobj, old_class_name); 1281a2de48caSGreg Kroah-Hartman } 1282a2de48caSGreg Kroah-Hartman } 128360b8cabdSKay Sievers #else 1284a2de48caSGreg Kroah-Hartman if (dev->class) { 12852ee97cafSCornelia Huck sysfs_remove_link(&dev->class->subsys.kobj, old_device_name); 12862ee97cafSCornelia Huck error = sysfs_create_link(&dev->class->subsys.kobj, &dev->kobj, 1287a2de48caSGreg Kroah-Hartman dev->bus_id); 12882ee97cafSCornelia Huck if (error) { 12892ee97cafSCornelia Huck dev_err(dev, "%s: sysfs_create_symlink failed (%d)\n", 12902ee97cafSCornelia Huck __FUNCTION__, error); 1291a2de48caSGreg Kroah-Hartman } 12922ee97cafSCornelia Huck } 129360b8cabdSKay Sievers #endif 129460b8cabdSKay Sievers 12952ee97cafSCornelia Huck out: 1296a2de48caSGreg Kroah-Hartman put_device(dev); 1297a2de48caSGreg Kroah-Hartman 1298a2de48caSGreg Kroah-Hartman kfree(new_class_name); 1299952ab431SJesper Juhl kfree(old_class_name); 13002ee97cafSCornelia Huck kfree(old_device_name); 1301a2de48caSGreg Kroah-Hartman 1302a2de48caSGreg Kroah-Hartman return error; 1303a2de48caSGreg Kroah-Hartman } 1304a2807dbcSJohannes Berg EXPORT_SYMBOL_GPL(device_rename); 13058a82472fSCornelia Huck 13068a82472fSCornelia Huck static int device_move_class_links(struct device *dev, 13078a82472fSCornelia Huck struct device *old_parent, 13088a82472fSCornelia Huck struct device *new_parent) 13098a82472fSCornelia Huck { 1310f7f3461dSGreg Kroah-Hartman int error = 0; 13118a82472fSCornelia Huck #ifdef CONFIG_SYSFS_DEPRECATED 13128a82472fSCornelia Huck char *class_name; 13138a82472fSCornelia Huck 13148a82472fSCornelia Huck class_name = make_class_name(dev->class->name, &dev->kobj); 13158a82472fSCornelia Huck if (!class_name) { 1316cb360bbfSCornelia Huck error = -ENOMEM; 13178a82472fSCornelia Huck goto out; 13188a82472fSCornelia Huck } 13198a82472fSCornelia Huck if (old_parent) { 13208a82472fSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 13218a82472fSCornelia Huck sysfs_remove_link(&old_parent->kobj, class_name); 13228a82472fSCornelia Huck } 1323c744aeaeSCornelia Huck if (new_parent) { 1324c744aeaeSCornelia Huck error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 1325c744aeaeSCornelia Huck "device"); 13268a82472fSCornelia Huck if (error) 13278a82472fSCornelia Huck goto out; 1328c744aeaeSCornelia Huck error = sysfs_create_link(&new_parent->kobj, &dev->kobj, 1329c744aeaeSCornelia Huck class_name); 13308a82472fSCornelia Huck if (error) 13318a82472fSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 1332c744aeaeSCornelia Huck } 1333c744aeaeSCornelia Huck else 1334c744aeaeSCornelia Huck error = 0; 13358a82472fSCornelia Huck out: 13368a82472fSCornelia Huck kfree(class_name); 13378a82472fSCornelia Huck return error; 13388a82472fSCornelia Huck #else 1339f7f3461dSGreg Kroah-Hartman if (old_parent) 1340f7f3461dSGreg Kroah-Hartman sysfs_remove_link(&dev->kobj, "device"); 1341f7f3461dSGreg Kroah-Hartman if (new_parent) 1342f7f3461dSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 1343f7f3461dSGreg Kroah-Hartman "device"); 1344f7f3461dSGreg Kroah-Hartman return error; 13458a82472fSCornelia Huck #endif 13468a82472fSCornelia Huck } 13478a82472fSCornelia Huck 13488a82472fSCornelia Huck /** 13498a82472fSCornelia Huck * device_move - moves a device to a new parent 13508a82472fSCornelia Huck * @dev: the pointer to the struct device to be moved 1351c744aeaeSCornelia Huck * @new_parent: the new parent of the device (can by NULL) 13528a82472fSCornelia Huck */ 13538a82472fSCornelia Huck int device_move(struct device *dev, struct device *new_parent) 13548a82472fSCornelia Huck { 13558a82472fSCornelia Huck int error; 13568a82472fSCornelia Huck struct device *old_parent; 1357c744aeaeSCornelia Huck struct kobject *new_parent_kobj; 13588a82472fSCornelia Huck 13598a82472fSCornelia Huck dev = get_device(dev); 13608a82472fSCornelia Huck if (!dev) 13618a82472fSCornelia Huck return -EINVAL; 13628a82472fSCornelia Huck 13638a82472fSCornelia Huck new_parent = get_device(new_parent); 1364c744aeaeSCornelia Huck new_parent_kobj = get_device_parent (dev, new_parent); 1365c744aeaeSCornelia Huck if (IS_ERR(new_parent_kobj)) { 1366c744aeaeSCornelia Huck error = PTR_ERR(new_parent_kobj); 1367c744aeaeSCornelia Huck put_device(new_parent); 13688a82472fSCornelia Huck goto out; 13698a82472fSCornelia Huck } 13707dc72b28SGreg Kroah-Hartman pr_debug("device: '%s': %s: moving to '%s'\n", dev->bus_id, 13717dc72b28SGreg Kroah-Hartman __FUNCTION__, new_parent ? new_parent->bus_id : "<NULL>"); 1372c744aeaeSCornelia Huck error = kobject_move(&dev->kobj, new_parent_kobj); 13738a82472fSCornelia Huck if (error) { 13748a82472fSCornelia Huck put_device(new_parent); 13758a82472fSCornelia Huck goto out; 13768a82472fSCornelia Huck } 13778a82472fSCornelia Huck old_parent = dev->parent; 13788a82472fSCornelia Huck dev->parent = new_parent; 13798a82472fSCornelia Huck if (old_parent) 1380acf02d23SCornelia Huck klist_remove(&dev->knode_parent); 1381c744aeaeSCornelia Huck if (new_parent) 13828a82472fSCornelia Huck klist_add_tail(&dev->knode_parent, &new_parent->klist_children); 13838a82472fSCornelia Huck if (!dev->class) 13848a82472fSCornelia Huck goto out_put; 13858a82472fSCornelia Huck error = device_move_class_links(dev, old_parent, new_parent); 13868a82472fSCornelia Huck if (error) { 13878a82472fSCornelia Huck /* We ignore errors on cleanup since we're hosed anyway... */ 13888a82472fSCornelia Huck device_move_class_links(dev, new_parent, old_parent); 13898a82472fSCornelia Huck if (!kobject_move(&dev->kobj, &old_parent->kobj)) { 1390c744aeaeSCornelia Huck if (new_parent) 1391acf02d23SCornelia Huck klist_remove(&dev->knode_parent); 13928a82472fSCornelia Huck if (old_parent) 13938a82472fSCornelia Huck klist_add_tail(&dev->knode_parent, 13948a82472fSCornelia Huck &old_parent->klist_children); 13958a82472fSCornelia Huck } 13968a82472fSCornelia Huck put_device(new_parent); 13978a82472fSCornelia Huck goto out; 13988a82472fSCornelia Huck } 13998a82472fSCornelia Huck out_put: 14008a82472fSCornelia Huck put_device(old_parent); 14018a82472fSCornelia Huck out: 14028a82472fSCornelia Huck put_device(dev); 14038a82472fSCornelia Huck return error; 14048a82472fSCornelia Huck } 14058a82472fSCornelia Huck EXPORT_SYMBOL_GPL(device_move); 140637b0c020SGreg Kroah-Hartman 140737b0c020SGreg Kroah-Hartman /** 140837b0c020SGreg Kroah-Hartman * device_shutdown - call ->shutdown() on each device to shutdown. 140937b0c020SGreg Kroah-Hartman */ 141037b0c020SGreg Kroah-Hartman void device_shutdown(void) 141137b0c020SGreg Kroah-Hartman { 141237b0c020SGreg Kroah-Hartman struct device * dev, *devn; 141337b0c020SGreg Kroah-Hartman 141437b0c020SGreg Kroah-Hartman list_for_each_entry_safe_reverse(dev, devn, &devices_kset->list, 141537b0c020SGreg Kroah-Hartman kobj.entry) { 141637b0c020SGreg Kroah-Hartman if (dev->bus && dev->bus->shutdown) { 141737b0c020SGreg Kroah-Hartman dev_dbg(dev, "shutdown\n"); 141837b0c020SGreg Kroah-Hartman dev->bus->shutdown(dev); 141937b0c020SGreg Kroah-Hartman } else if (dev->driver && dev->driver->shutdown) { 142037b0c020SGreg Kroah-Hartman dev_dbg(dev, "shutdown\n"); 142137b0c020SGreg Kroah-Hartman dev->driver->shutdown(dev); 142237b0c020SGreg Kroah-Hartman } 142337b0c020SGreg Kroah-Hartman } 142437b0c020SGreg Kroah-Hartman } 1425