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> 211da177e4SLinus Torvalds 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 /* 31b446b60eSAndrew Morton * Detect the LANANA-assigned LOCAL/EXPERIMENTAL majors 32b446b60eSAndrew Morton */ 33b446b60eSAndrew Morton bool is_lanana_major(unsigned int major) 34b446b60eSAndrew Morton { 35b446b60eSAndrew Morton if (major >= 60 && major <= 63) 36b446b60eSAndrew Morton return 1; 37b446b60eSAndrew Morton if (major >= 120 && major <= 127) 38b446b60eSAndrew Morton return 1; 39b446b60eSAndrew Morton if (major >= 240 && major <= 254) 40b446b60eSAndrew Morton return 1; 41b446b60eSAndrew Morton return 0; 42b446b60eSAndrew Morton } 43b446b60eSAndrew Morton 44b446b60eSAndrew Morton /* 451da177e4SLinus Torvalds * sysfs bindings for devices. 461da177e4SLinus Torvalds */ 471da177e4SLinus Torvalds 483e95637aSAlan Stern /** 493e95637aSAlan Stern * dev_driver_string - Return a device's driver name, if at all possible 503e95637aSAlan Stern * @dev: struct device to get the name of 513e95637aSAlan Stern * 523e95637aSAlan Stern * Will return the device's driver's name if it is bound to a device. If 533e95637aSAlan Stern * the device is not bound to a device, it will return the name of the bus 543e95637aSAlan Stern * it is attached to. If it is not attached to a bus either, an empty 553e95637aSAlan Stern * string will be returned. 563e95637aSAlan Stern */ 573e95637aSAlan Stern const char *dev_driver_string(struct device *dev) 583e95637aSAlan Stern { 593e95637aSAlan Stern return dev->driver ? dev->driver->name : 603e95637aSAlan Stern (dev->bus ? dev->bus->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 671da177e4SLinus Torvalds static ssize_t 681da177e4SLinus Torvalds dev_attr_show(struct kobject * kobj, struct attribute * attr, 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); 761da177e4SLinus Torvalds return ret; 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds static ssize_t 801da177e4SLinus Torvalds dev_attr_store(struct kobject * kobj, struct attribute * attr, 811da177e4SLinus Torvalds const char * buf, size_t count) 821da177e4SLinus Torvalds { 831da177e4SLinus Torvalds struct device_attribute * dev_attr = to_dev_attr(attr); 841da177e4SLinus Torvalds struct device * dev = to_dev(kobj); 854a0c20bfSDmitry Torokhov ssize_t ret = -EIO; 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds if (dev_attr->store) 8854b6f35cSYani Ioannou ret = dev_attr->store(dev, dev_attr, buf, count); 891da177e4SLinus Torvalds return ret; 901da177e4SLinus Torvalds } 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds static struct sysfs_ops dev_sysfs_ops = { 931da177e4SLinus Torvalds .show = dev_attr_show, 941da177e4SLinus Torvalds .store = dev_attr_store, 951da177e4SLinus Torvalds }; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds /** 991da177e4SLinus Torvalds * device_release - free device structure. 1001da177e4SLinus Torvalds * @kobj: device's kobject. 1011da177e4SLinus Torvalds * 1021da177e4SLinus Torvalds * This is called once the reference count for the object 1031da177e4SLinus Torvalds * reaches 0. We forward the call to the device's release 1041da177e4SLinus Torvalds * method, which should handle actually freeing the structure. 1051da177e4SLinus Torvalds */ 1061da177e4SLinus Torvalds static void device_release(struct kobject * kobj) 1071da177e4SLinus Torvalds { 1081da177e4SLinus Torvalds struct device * dev = to_dev(kobj); 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds if (dev->release) 1111da177e4SLinus Torvalds dev->release(dev); 112f9f852dfSKay Sievers else if (dev->type && dev->type->release) 113f9f852dfSKay Sievers dev->type->release(dev); 1142620efefSGreg Kroah-Hartman else if (dev->class && dev->class->dev_release) 1152620efefSGreg Kroah-Hartman dev->class->dev_release(dev); 1161da177e4SLinus Torvalds else { 1171da177e4SLinus Torvalds printk(KERN_ERR "Device '%s' does not have a release() function, " 1181da177e4SLinus Torvalds "it is broken and must be fixed.\n", 1191da177e4SLinus Torvalds dev->bus_id); 1201da177e4SLinus Torvalds WARN_ON(1); 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds static struct kobj_type ktype_device = { 1251da177e4SLinus Torvalds .release = device_release, 1261da177e4SLinus Torvalds .sysfs_ops = &dev_sysfs_ops, 1271da177e4SLinus Torvalds }; 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvalds 130312c004dSKay Sievers static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) 1311da177e4SLinus Torvalds { 1321da177e4SLinus Torvalds struct kobj_type *ktype = get_ktype(kobj); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds if (ktype == &ktype_device) { 1351da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1361da177e4SLinus Torvalds if (dev->bus) 1371da177e4SLinus Torvalds return 1; 13823681e47SGreg Kroah-Hartman if (dev->class) 13923681e47SGreg Kroah-Hartman return 1; 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds return 0; 1421da177e4SLinus Torvalds } 1431da177e4SLinus Torvalds 144312c004dSKay Sievers static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) 1451da177e4SLinus Torvalds { 1461da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1471da177e4SLinus Torvalds 14823681e47SGreg Kroah-Hartman if (dev->bus) 1491da177e4SLinus Torvalds return dev->bus->name; 15023681e47SGreg Kroah-Hartman if (dev->class) 15123681e47SGreg Kroah-Hartman return dev->class->name; 15223681e47SGreg Kroah-Hartman return NULL; 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds 155312c004dSKay Sievers static int dev_uevent(struct kset *kset, struct kobject *kobj, char **envp, 1561da177e4SLinus Torvalds int num_envp, char *buffer, int buffer_size) 1571da177e4SLinus Torvalds { 1581da177e4SLinus Torvalds struct device *dev = to_dev(kobj); 1591da177e4SLinus Torvalds int i = 0; 1601da177e4SLinus Torvalds int length = 0; 1611da177e4SLinus Torvalds int retval = 0; 1621da177e4SLinus Torvalds 16323681e47SGreg Kroah-Hartman /* add the major/minor if present */ 16423681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 16523681e47SGreg Kroah-Hartman add_uevent_var(envp, num_envp, &i, 16623681e47SGreg Kroah-Hartman buffer, buffer_size, &length, 16723681e47SGreg Kroah-Hartman "MAJOR=%u", MAJOR(dev->devt)); 16823681e47SGreg Kroah-Hartman add_uevent_var(envp, num_envp, &i, 16923681e47SGreg Kroah-Hartman buffer, buffer_size, &length, 17023681e47SGreg Kroah-Hartman "MINOR=%u", MINOR(dev->devt)); 17123681e47SGreg Kroah-Hartman } 17223681e47SGreg Kroah-Hartman 173239378f1SKay Sievers if (dev->driver) 174d81d9d6bSKay Sievers add_uevent_var(envp, num_envp, &i, 175d81d9d6bSKay Sievers buffer, buffer_size, &length, 176d81d9d6bSKay Sievers "DRIVER=%s", dev->driver->name); 177239378f1SKay Sievers 178a87cb2acSKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 179239378f1SKay Sievers if (dev->class) { 180239378f1SKay Sievers struct device *parent = dev->parent; 181239378f1SKay Sievers 182239378f1SKay Sievers /* find first bus device in parent chain */ 183239378f1SKay Sievers while (parent && !parent->bus) 184239378f1SKay Sievers parent = parent->parent; 185239378f1SKay Sievers if (parent && parent->bus) { 186239378f1SKay Sievers const char *path; 187239378f1SKay Sievers 188239378f1SKay Sievers path = kobject_get_path(&parent->kobj, GFP_KERNEL); 189239378f1SKay Sievers add_uevent_var(envp, num_envp, &i, 190239378f1SKay Sievers buffer, buffer_size, &length, 191239378f1SKay Sievers "PHYSDEVPATH=%s", path); 192239378f1SKay Sievers kfree(path); 193239378f1SKay Sievers 194239378f1SKay Sievers add_uevent_var(envp, num_envp, &i, 195239378f1SKay Sievers buffer, buffer_size, &length, 196239378f1SKay Sievers "PHYSDEVBUS=%s", parent->bus->name); 197239378f1SKay Sievers 198239378f1SKay Sievers if (parent->driver) 199239378f1SKay Sievers add_uevent_var(envp, num_envp, &i, 200239378f1SKay Sievers buffer, buffer_size, &length, 201239378f1SKay Sievers "PHYSDEVDRIVER=%s", parent->driver->name); 202239378f1SKay Sievers } 203239378f1SKay Sievers } else if (dev->bus) { 204239378f1SKay Sievers add_uevent_var(envp, num_envp, &i, 205239378f1SKay Sievers buffer, buffer_size, &length, 206239378f1SKay Sievers "PHYSDEVBUS=%s", dev->bus->name); 207239378f1SKay Sievers 208239378f1SKay Sievers if (dev->driver) 209312c004dSKay Sievers add_uevent_var(envp, num_envp, &i, 2101da177e4SLinus Torvalds buffer, buffer_size, &length, 2111da177e4SLinus Torvalds "PHYSDEVDRIVER=%s", dev->driver->name); 212d81d9d6bSKay Sievers } 213239378f1SKay Sievers #endif 2141da177e4SLinus Torvalds 2151da177e4SLinus Torvalds /* terminate, set to next free slot, shrink available space */ 2161da177e4SLinus Torvalds envp[i] = NULL; 2171da177e4SLinus Torvalds envp = &envp[i]; 2181da177e4SLinus Torvalds num_envp -= i; 2191da177e4SLinus Torvalds buffer = &buffer[length]; 2201da177e4SLinus Torvalds buffer_size -= length; 2211da177e4SLinus Torvalds 222312c004dSKay Sievers if (dev->bus && dev->bus->uevent) { 2231da177e4SLinus Torvalds /* have the bus specific function add its stuff */ 224312c004dSKay Sievers retval = dev->bus->uevent(dev, envp, num_envp, buffer, buffer_size); 225f9f852dfSKay Sievers if (retval) 226f9f852dfSKay Sievers pr_debug ("%s: bus uevent() returned %d\n", 2271da177e4SLinus Torvalds __FUNCTION__, retval); 2281da177e4SLinus Torvalds } 2291da177e4SLinus Torvalds 2302620efefSGreg Kroah-Hartman if (dev->class && dev->class->dev_uevent) { 2312620efefSGreg Kroah-Hartman /* have the class specific function add its stuff */ 2322620efefSGreg Kroah-Hartman retval = dev->class->dev_uevent(dev, envp, num_envp, buffer, buffer_size); 233f9f852dfSKay Sievers if (retval) 234f9f852dfSKay Sievers pr_debug("%s: class uevent() returned %d\n", 2352620efefSGreg Kroah-Hartman __FUNCTION__, retval); 2362620efefSGreg Kroah-Hartman } 237f9f852dfSKay Sievers 238f9f852dfSKay Sievers if (dev->type && dev->type->uevent) { 239f9f852dfSKay Sievers /* have the device type specific fuction add its stuff */ 240f9f852dfSKay Sievers retval = dev->type->uevent(dev, envp, num_envp, buffer, buffer_size); 241f9f852dfSKay Sievers if (retval) 242f9f852dfSKay Sievers pr_debug("%s: dev_type uevent() returned %d\n", 243f9f852dfSKay Sievers __FUNCTION__, retval); 2442620efefSGreg Kroah-Hartman } 2452620efefSGreg Kroah-Hartman 2461da177e4SLinus Torvalds return retval; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds 249312c004dSKay Sievers static struct kset_uevent_ops device_uevent_ops = { 250312c004dSKay Sievers .filter = dev_uevent_filter, 251312c004dSKay Sievers .name = dev_uevent_name, 252312c004dSKay Sievers .uevent = dev_uevent, 2531da177e4SLinus Torvalds }; 2541da177e4SLinus Torvalds 255a7fd6706SKay Sievers static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, 256a7fd6706SKay Sievers const char *buf, size_t count) 257a7fd6706SKay Sievers { 258312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 259a7fd6706SKay Sievers return count; 260a7fd6706SKay Sievers } 261a7fd6706SKay Sievers 262de0ff00dSGreg Kroah-Hartman static int device_add_groups(struct device *dev) 263de0ff00dSGreg Kroah-Hartman { 264de0ff00dSGreg Kroah-Hartman int i; 265de0ff00dSGreg Kroah-Hartman int error = 0; 266de0ff00dSGreg Kroah-Hartman 267de0ff00dSGreg Kroah-Hartman if (dev->groups) { 268de0ff00dSGreg Kroah-Hartman for (i = 0; dev->groups[i]; i++) { 269de0ff00dSGreg Kroah-Hartman error = sysfs_create_group(&dev->kobj, dev->groups[i]); 270de0ff00dSGreg Kroah-Hartman if (error) { 271de0ff00dSGreg Kroah-Hartman while (--i >= 0) 272de0ff00dSGreg Kroah-Hartman sysfs_remove_group(&dev->kobj, dev->groups[i]); 273de0ff00dSGreg Kroah-Hartman goto out; 274de0ff00dSGreg Kroah-Hartman } 275de0ff00dSGreg Kroah-Hartman } 276de0ff00dSGreg Kroah-Hartman } 277de0ff00dSGreg Kroah-Hartman out: 278de0ff00dSGreg Kroah-Hartman return error; 279de0ff00dSGreg Kroah-Hartman } 280de0ff00dSGreg Kroah-Hartman 281de0ff00dSGreg Kroah-Hartman static void device_remove_groups(struct device *dev) 282de0ff00dSGreg Kroah-Hartman { 283de0ff00dSGreg Kroah-Hartman int i; 284de0ff00dSGreg Kroah-Hartman if (dev->groups) { 285de0ff00dSGreg Kroah-Hartman for (i = 0; dev->groups[i]; i++) { 286de0ff00dSGreg Kroah-Hartman sysfs_remove_group(&dev->kobj, dev->groups[i]); 287de0ff00dSGreg Kroah-Hartman } 288de0ff00dSGreg Kroah-Hartman } 289de0ff00dSGreg Kroah-Hartman } 290de0ff00dSGreg Kroah-Hartman 2912620efefSGreg Kroah-Hartman static int device_add_attrs(struct device *dev) 2922620efefSGreg Kroah-Hartman { 2932620efefSGreg Kroah-Hartman struct class *class = dev->class; 294f9f852dfSKay Sievers struct device_type *type = dev->type; 2952620efefSGreg Kroah-Hartman int error = 0; 2962620efefSGreg Kroah-Hartman int i; 2972620efefSGreg Kroah-Hartman 298f9f852dfSKay Sievers if (class && class->dev_attrs) { 2992620efefSGreg Kroah-Hartman for (i = 0; attr_name(class->dev_attrs[i]); i++) { 3002620efefSGreg Kroah-Hartman error = device_create_file(dev, &class->dev_attrs[i]); 3012620efefSGreg Kroah-Hartman if (error) 3022620efefSGreg Kroah-Hartman break; 3032620efefSGreg Kroah-Hartman } 3042620efefSGreg Kroah-Hartman if (error) 3052620efefSGreg Kroah-Hartman while (--i >= 0) 3062620efefSGreg Kroah-Hartman device_remove_file(dev, &class->dev_attrs[i]); 307f9f852dfSKay Sievers } 308f9f852dfSKay Sievers 309f9f852dfSKay Sievers if (type && type->attrs) { 310f9f852dfSKay Sievers for (i = 0; attr_name(type->attrs[i]); i++) { 311f9f852dfSKay Sievers error = device_create_file(dev, &type->attrs[i]); 312f9f852dfSKay Sievers if (error) 313f9f852dfSKay Sievers break; 314f9f852dfSKay Sievers } 315f9f852dfSKay Sievers if (error) 316f9f852dfSKay Sievers while (--i >= 0) 317f9f852dfSKay Sievers device_remove_file(dev, &type->attrs[i]); 318f9f852dfSKay Sievers } 319f9f852dfSKay Sievers 3202620efefSGreg Kroah-Hartman return error; 3212620efefSGreg Kroah-Hartman } 3222620efefSGreg Kroah-Hartman 3232620efefSGreg Kroah-Hartman static void device_remove_attrs(struct device *dev) 3242620efefSGreg Kroah-Hartman { 3252620efefSGreg Kroah-Hartman struct class *class = dev->class; 326f9f852dfSKay Sievers struct device_type *type = dev->type; 3272620efefSGreg Kroah-Hartman int i; 3282620efefSGreg Kroah-Hartman 329f9f852dfSKay Sievers if (class && class->dev_attrs) { 3302620efefSGreg Kroah-Hartman for (i = 0; attr_name(class->dev_attrs[i]); i++) 3312620efefSGreg Kroah-Hartman device_remove_file(dev, &class->dev_attrs[i]); 3322620efefSGreg Kroah-Hartman } 333f9f852dfSKay Sievers 334f9f852dfSKay Sievers if (type && type->attrs) { 335f9f852dfSKay Sievers for (i = 0; attr_name(type->attrs[i]); i++) 336f9f852dfSKay Sievers device_remove_file(dev, &type->attrs[i]); 337f9f852dfSKay Sievers } 3382620efefSGreg Kroah-Hartman } 3392620efefSGreg Kroah-Hartman 3402620efefSGreg Kroah-Hartman 34123681e47SGreg Kroah-Hartman static ssize_t show_dev(struct device *dev, struct device_attribute *attr, 34223681e47SGreg Kroah-Hartman char *buf) 34323681e47SGreg Kroah-Hartman { 34423681e47SGreg Kroah-Hartman return print_dev_t(buf, dev->devt); 34523681e47SGreg Kroah-Hartman } 34623681e47SGreg Kroah-Hartman 3470863afb3SMartin Waitz /* 3480863afb3SMartin Waitz * devices_subsys - structure to be registered with kobject core. 3491da177e4SLinus Torvalds */ 3501da177e4SLinus Torvalds 351312c004dSKay Sievers decl_subsys(devices, &ktype_device, &device_uevent_ops); 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds /** 3551da177e4SLinus Torvalds * device_create_file - create sysfs attribute file for device. 3561da177e4SLinus Torvalds * @dev: device. 3571da177e4SLinus Torvalds * @attr: device attribute descriptor. 3581da177e4SLinus Torvalds */ 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds int device_create_file(struct device * dev, struct device_attribute * attr) 3611da177e4SLinus Torvalds { 3621da177e4SLinus Torvalds int error = 0; 3631da177e4SLinus Torvalds if (get_device(dev)) { 3641da177e4SLinus Torvalds error = sysfs_create_file(&dev->kobj, &attr->attr); 3651da177e4SLinus Torvalds put_device(dev); 3661da177e4SLinus Torvalds } 3671da177e4SLinus Torvalds return error; 3681da177e4SLinus Torvalds } 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvalds /** 3711da177e4SLinus Torvalds * device_remove_file - remove sysfs attribute file. 3721da177e4SLinus Torvalds * @dev: device. 3731da177e4SLinus Torvalds * @attr: device attribute descriptor. 3741da177e4SLinus Torvalds */ 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds void device_remove_file(struct device * dev, struct device_attribute * attr) 3771da177e4SLinus Torvalds { 3781da177e4SLinus Torvalds if (get_device(dev)) { 3791da177e4SLinus Torvalds sysfs_remove_file(&dev->kobj, &attr->attr); 3801da177e4SLinus Torvalds put_device(dev); 3811da177e4SLinus Torvalds } 3821da177e4SLinus Torvalds } 3831da177e4SLinus Torvalds 3842589f188SGreg Kroah-Hartman /** 3852589f188SGreg Kroah-Hartman * device_create_bin_file - create sysfs binary attribute file for device. 3862589f188SGreg Kroah-Hartman * @dev: device. 3872589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 3882589f188SGreg Kroah-Hartman */ 3892589f188SGreg Kroah-Hartman int device_create_bin_file(struct device *dev, struct bin_attribute *attr) 3902589f188SGreg Kroah-Hartman { 3912589f188SGreg Kroah-Hartman int error = -EINVAL; 3922589f188SGreg Kroah-Hartman if (dev) 3932589f188SGreg Kroah-Hartman error = sysfs_create_bin_file(&dev->kobj, attr); 3942589f188SGreg Kroah-Hartman return error; 3952589f188SGreg Kroah-Hartman } 3962589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create_bin_file); 3972589f188SGreg Kroah-Hartman 3982589f188SGreg Kroah-Hartman /** 3992589f188SGreg Kroah-Hartman * device_remove_bin_file - remove sysfs binary attribute file 4002589f188SGreg Kroah-Hartman * @dev: device. 4012589f188SGreg Kroah-Hartman * @attr: device binary attribute descriptor. 4022589f188SGreg Kroah-Hartman */ 4032589f188SGreg Kroah-Hartman void device_remove_bin_file(struct device *dev, struct bin_attribute *attr) 4042589f188SGreg Kroah-Hartman { 4052589f188SGreg Kroah-Hartman if (dev) 4062589f188SGreg Kroah-Hartman sysfs_remove_bin_file(&dev->kobj, attr); 4072589f188SGreg Kroah-Hartman } 4082589f188SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_remove_bin_file); 4092589f188SGreg Kroah-Hartman 41034bb61f9SJames Bottomley static void klist_children_get(struct klist_node *n) 41134bb61f9SJames Bottomley { 41234bb61f9SJames Bottomley struct device *dev = container_of(n, struct device, knode_parent); 41334bb61f9SJames Bottomley 41434bb61f9SJames Bottomley get_device(dev); 41534bb61f9SJames Bottomley } 41634bb61f9SJames Bottomley 41734bb61f9SJames Bottomley static void klist_children_put(struct klist_node *n) 41834bb61f9SJames Bottomley { 41934bb61f9SJames Bottomley struct device *dev = container_of(n, struct device, knode_parent); 42034bb61f9SJames Bottomley 42134bb61f9SJames Bottomley put_device(dev); 42234bb61f9SJames Bottomley } 42334bb61f9SJames Bottomley 4241da177e4SLinus Torvalds 4251da177e4SLinus Torvalds /** 4261da177e4SLinus Torvalds * device_initialize - init device structure. 4271da177e4SLinus Torvalds * @dev: device. 4281da177e4SLinus Torvalds * 4291da177e4SLinus Torvalds * This prepares the device for use by other layers, 4301da177e4SLinus Torvalds * including adding it to the device hierarchy. 4311da177e4SLinus Torvalds * It is the first half of device_register(), if called by 4321da177e4SLinus Torvalds * that, though it can also be called separately, so one 4331da177e4SLinus Torvalds * may use @dev's fields (e.g. the refcount). 4341da177e4SLinus Torvalds */ 4351da177e4SLinus Torvalds 4361da177e4SLinus Torvalds void device_initialize(struct device *dev) 4371da177e4SLinus Torvalds { 4381da177e4SLinus Torvalds kobj_set_kset_s(dev, devices_subsys); 4391da177e4SLinus Torvalds kobject_init(&dev->kobj); 44034bb61f9SJames Bottomley klist_init(&dev->klist_children, klist_children_get, 44134bb61f9SJames Bottomley klist_children_put); 4421da177e4SLinus Torvalds INIT_LIST_HEAD(&dev->dma_pools); 44323681e47SGreg Kroah-Hartman INIT_LIST_HEAD(&dev->node); 444af70316aSmochel@digitalimplant.org init_MUTEX(&dev->sem); 4459ac7849eSTejun Heo spin_lock_init(&dev->devres_lock); 4469ac7849eSTejun Heo INIT_LIST_HEAD(&dev->devres_head); 4470ac85241SDavid Brownell device_init_wakeup(dev, 0); 44887348136SChristoph Hellwig set_dev_node(dev, -1); 4491da177e4SLinus Torvalds } 4501da177e4SLinus Torvalds 45140fa5422SGreg Kroah-Hartman #ifdef CONFIG_SYSFS_DEPRECATED 452c744aeaeSCornelia Huck static struct kobject * get_device_parent(struct device *dev, 453c744aeaeSCornelia Huck struct device *parent) 45440fa5422SGreg Kroah-Hartman { 45540fa5422SGreg Kroah-Hartman /* Set the parent to the class, not the parent device */ 45640fa5422SGreg Kroah-Hartman /* this keeps sysfs from having a symlink to make old udevs happy */ 45740fa5422SGreg Kroah-Hartman if (dev->class) 458c744aeaeSCornelia Huck return &dev->class->subsys.kset.kobj; 45940fa5422SGreg Kroah-Hartman else if (parent) 460c744aeaeSCornelia Huck return &parent->kobj; 46140fa5422SGreg Kroah-Hartman 462c744aeaeSCornelia Huck return NULL; 46340fa5422SGreg Kroah-Hartman } 46440fa5422SGreg Kroah-Hartman #else 465c744aeaeSCornelia Huck static struct kobject * virtual_device_parent(struct device *dev) 466f0ee61a6SGreg Kroah-Hartman { 467f0ee61a6SGreg Kroah-Hartman if (!dev->class) 468c744aeaeSCornelia Huck return ERR_PTR(-ENODEV); 469f0ee61a6SGreg Kroah-Hartman 470f0ee61a6SGreg Kroah-Hartman if (!dev->class->virtual_dir) { 471f0ee61a6SGreg Kroah-Hartman static struct kobject *virtual_dir = NULL; 472f0ee61a6SGreg Kroah-Hartman 473f0ee61a6SGreg Kroah-Hartman if (!virtual_dir) 474f0ee61a6SGreg Kroah-Hartman virtual_dir = kobject_add_dir(&devices_subsys.kset.kobj, "virtual"); 475f0ee61a6SGreg Kroah-Hartman dev->class->virtual_dir = kobject_add_dir(virtual_dir, dev->class->name); 476f0ee61a6SGreg Kroah-Hartman } 477f0ee61a6SGreg Kroah-Hartman 478c744aeaeSCornelia Huck return dev->class->virtual_dir; 479f0ee61a6SGreg Kroah-Hartman } 480f0ee61a6SGreg Kroah-Hartman 481c744aeaeSCornelia Huck static struct kobject * get_device_parent(struct device *dev, 482c744aeaeSCornelia Huck struct device *parent) 48340fa5422SGreg Kroah-Hartman { 48440fa5422SGreg Kroah-Hartman /* if this is a class device, and has no parent, create one */ 48540fa5422SGreg Kroah-Hartman if ((dev->class) && (parent == NULL)) { 486c744aeaeSCornelia Huck return virtual_device_parent(dev); 48740fa5422SGreg Kroah-Hartman } else if (parent) 488c744aeaeSCornelia Huck return &parent->kobj; 489c744aeaeSCornelia Huck return NULL; 490c744aeaeSCornelia Huck } 49140fa5422SGreg Kroah-Hartman 492c744aeaeSCornelia Huck #endif 493c744aeaeSCornelia Huck static int setup_parent(struct device *dev, struct device *parent) 494c744aeaeSCornelia Huck { 495c744aeaeSCornelia Huck struct kobject *kobj; 496c744aeaeSCornelia Huck kobj = get_device_parent(dev, parent); 497c744aeaeSCornelia Huck if (IS_ERR(kobj)) 498c744aeaeSCornelia Huck return PTR_ERR(kobj); 499c744aeaeSCornelia Huck if (kobj) 500c744aeaeSCornelia Huck dev->kobj.parent = kobj; 50140fa5422SGreg Kroah-Hartman return 0; 50240fa5422SGreg Kroah-Hartman } 50340fa5422SGreg Kroah-Hartman 5041da177e4SLinus Torvalds /** 5051da177e4SLinus Torvalds * device_add - add device to device hierarchy. 5061da177e4SLinus Torvalds * @dev: device. 5071da177e4SLinus Torvalds * 5081da177e4SLinus Torvalds * This is part 2 of device_register(), though may be called 5091da177e4SLinus Torvalds * separately _iff_ device_initialize() has been called separately. 5101da177e4SLinus Torvalds * 5111da177e4SLinus Torvalds * This adds it to the kobject hierarchy via kobject_add(), adds it 5121da177e4SLinus Torvalds * to the global and sibling lists for the device, then 5131da177e4SLinus Torvalds * adds it to the other relevant subsystems of the driver model. 5141da177e4SLinus Torvalds */ 5151da177e4SLinus Torvalds int device_add(struct device *dev) 5161da177e4SLinus Torvalds { 5171da177e4SLinus Torvalds struct device *parent = NULL; 518e9a7d305SGreg Kroah-Hartman char *class_name = NULL; 519c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 5201da177e4SLinus Torvalds int error = -EINVAL; 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds dev = get_device(dev); 5231da177e4SLinus Torvalds if (!dev || !strlen(dev->bus_id)) 5241da177e4SLinus Torvalds goto Error; 5251da177e4SLinus Torvalds 52640fa5422SGreg Kroah-Hartman pr_debug("DEV: registering device: ID = '%s'\n", dev->bus_id); 527c205ef48SGreg Kroah-Hartman 5281da177e4SLinus Torvalds parent = get_device(dev->parent); 5291da177e4SLinus Torvalds 53040fa5422SGreg Kroah-Hartman error = setup_parent(dev, parent); 53140fa5422SGreg Kroah-Hartman if (error) 53240fa5422SGreg Kroah-Hartman goto Error; 5331da177e4SLinus Torvalds 5341da177e4SLinus Torvalds /* first, register with generic layer. */ 5351da177e4SLinus Torvalds kobject_set_name(&dev->kobj, "%s", dev->bus_id); 53640fa5422SGreg Kroah-Hartman error = kobject_add(&dev->kobj); 53740fa5422SGreg Kroah-Hartman if (error) 5381da177e4SLinus Torvalds goto Error; 539a7fd6706SKay Sievers 54037022644SBrian Walsh /* notify platform of device entry */ 54137022644SBrian Walsh if (platform_notify) 54237022644SBrian Walsh platform_notify(dev); 54337022644SBrian Walsh 544116af378SBenjamin Herrenschmidt /* notify clients of device entry (new way) */ 545116af378SBenjamin Herrenschmidt if (dev->bus) 546116af378SBenjamin Herrenschmidt blocking_notifier_call_chain(&dev->bus->bus_notifier, 547116af378SBenjamin Herrenschmidt BUS_NOTIFY_ADD_DEVICE, dev); 548116af378SBenjamin Herrenschmidt 549a7fd6706SKay Sievers dev->uevent_attr.attr.name = "uevent"; 550a7fd6706SKay Sievers dev->uevent_attr.attr.mode = S_IWUSR; 551a7fd6706SKay Sievers if (dev->driver) 552a7fd6706SKay Sievers dev->uevent_attr.attr.owner = dev->driver->owner; 553a7fd6706SKay Sievers dev->uevent_attr.store = store_uevent; 554a306eea4SCornelia Huck error = device_create_file(dev, &dev->uevent_attr); 555a306eea4SCornelia Huck if (error) 556a306eea4SCornelia Huck goto attrError; 557a7fd6706SKay Sievers 55823681e47SGreg Kroah-Hartman if (MAJOR(dev->devt)) { 55923681e47SGreg Kroah-Hartman struct device_attribute *attr; 56023681e47SGreg Kroah-Hartman attr = kzalloc(sizeof(*attr), GFP_KERNEL); 56123681e47SGreg Kroah-Hartman if (!attr) { 56223681e47SGreg Kroah-Hartman error = -ENOMEM; 563a306eea4SCornelia Huck goto ueventattrError; 56423681e47SGreg Kroah-Hartman } 56523681e47SGreg Kroah-Hartman attr->attr.name = "dev"; 56623681e47SGreg Kroah-Hartman attr->attr.mode = S_IRUGO; 56723681e47SGreg Kroah-Hartman if (dev->driver) 56823681e47SGreg Kroah-Hartman attr->attr.owner = dev->driver->owner; 56923681e47SGreg Kroah-Hartman attr->show = show_dev; 57023681e47SGreg Kroah-Hartman error = device_create_file(dev, attr); 57123681e47SGreg Kroah-Hartman if (error) { 57223681e47SGreg Kroah-Hartman kfree(attr); 573a306eea4SCornelia Huck goto ueventattrError; 57423681e47SGreg Kroah-Hartman } 57523681e47SGreg Kroah-Hartman 57623681e47SGreg Kroah-Hartman dev->devt_attr = attr; 57723681e47SGreg Kroah-Hartman } 57823681e47SGreg Kroah-Hartman 579b9d9c82bSKay Sievers if (dev->class) { 580b9d9c82bSKay Sievers sysfs_create_link(&dev->kobj, &dev->class->subsys.kset.kobj, 581b9d9c82bSKay Sievers "subsystem"); 58240fa5422SGreg Kroah-Hartman /* If this is not a "fake" compatible device, then create the 58340fa5422SGreg Kroah-Hartman * symlink from the class to the device. */ 58440fa5422SGreg Kroah-Hartman if (dev->kobj.parent != &dev->class->subsys.kset.kobj) 58540fa5422SGreg Kroah-Hartman sysfs_create_link(&dev->class->subsys.kset.kobj, 58640fa5422SGreg Kroah-Hartman &dev->kobj, dev->bus_id); 58764bb5d2cSGreg Kroah-Hartman if (parent) { 588cb360bbfSCornelia Huck sysfs_create_link(&dev->kobj, &dev->parent->kobj, 589cb360bbfSCornelia Huck "device"); 590f7f3461dSGreg Kroah-Hartman #ifdef CONFIG_SYSFS_DEPRECATED 591cb360bbfSCornelia Huck class_name = make_class_name(dev->class->name, 592cb360bbfSCornelia Huck &dev->kobj); 593cb360bbfSCornelia Huck if (class_name) 594cb360bbfSCornelia Huck sysfs_create_link(&dev->parent->kobj, 595cb360bbfSCornelia Huck &dev->kobj, class_name); 59699ef3ef8SKay Sievers #endif 59764bb5d2cSGreg Kroah-Hartman } 598f7f3461dSGreg Kroah-Hartman } 59923681e47SGreg Kroah-Hartman 6002620efefSGreg Kroah-Hartman if ((error = device_add_attrs(dev))) 6012620efefSGreg Kroah-Hartman goto AttrsError; 602de0ff00dSGreg Kroah-Hartman if ((error = device_add_groups(dev))) 603de0ff00dSGreg Kroah-Hartman goto GroupError; 6041da177e4SLinus Torvalds if ((error = device_pm_add(dev))) 6051da177e4SLinus Torvalds goto PMError; 6061da177e4SLinus Torvalds if ((error = bus_add_device(dev))) 6071da177e4SLinus Torvalds goto BusError; 608b7a3e813SKay Sievers if (!dev->uevent_suppress) 60953877d06SKay Sievers kobject_uevent(&dev->kobj, KOBJ_ADD); 610f70fa629SAlan Stern if ((error = bus_attach_device(dev))) 611f70fa629SAlan Stern goto AttachError; 6121da177e4SLinus Torvalds if (parent) 613d856f1e3SJames Bottomley klist_add_tail(&dev->knode_parent, &parent->klist_children); 6141da177e4SLinus Torvalds 6155d9fd169SGreg Kroah-Hartman if (dev->class) { 6165d9fd169SGreg Kroah-Hartman down(&dev->class->sem); 617c47ed219SGreg Kroah-Hartman /* tie the class to the device */ 6185d9fd169SGreg Kroah-Hartman list_add_tail(&dev->node, &dev->class->devices); 619c47ed219SGreg Kroah-Hartman 620c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is here */ 621c47ed219SGreg Kroah-Hartman list_for_each_entry(class_intf, &dev->class->interfaces, node) 622c47ed219SGreg Kroah-Hartman if (class_intf->add_dev) 623c47ed219SGreg Kroah-Hartman class_intf->add_dev(dev, class_intf); 6245d9fd169SGreg Kroah-Hartman up(&dev->class->sem); 6255d9fd169SGreg Kroah-Hartman } 6261da177e4SLinus Torvalds Done: 627e9a7d305SGreg Kroah-Hartman kfree(class_name); 6281da177e4SLinus Torvalds put_device(dev); 6291da177e4SLinus Torvalds return error; 630f70fa629SAlan Stern AttachError: 631f70fa629SAlan Stern bus_remove_device(dev); 6321da177e4SLinus Torvalds BusError: 6331da177e4SLinus Torvalds device_pm_remove(dev); 6341da177e4SLinus Torvalds PMError: 635116af378SBenjamin Herrenschmidt if (dev->bus) 636116af378SBenjamin Herrenschmidt blocking_notifier_call_chain(&dev->bus->bus_notifier, 637116af378SBenjamin Herrenschmidt BUS_NOTIFY_DEL_DEVICE, dev); 638de0ff00dSGreg Kroah-Hartman device_remove_groups(dev); 639de0ff00dSGreg Kroah-Hartman GroupError: 6402620efefSGreg Kroah-Hartman device_remove_attrs(dev); 6412620efefSGreg Kroah-Hartman AttrsError: 64223681e47SGreg Kroah-Hartman if (dev->devt_attr) { 64323681e47SGreg Kroah-Hartman device_remove_file(dev, dev->devt_attr); 64423681e47SGreg Kroah-Hartman kfree(dev->devt_attr); 64582f0cf9bSJames Simmons } 64682f0cf9bSJames Simmons 64782f0cf9bSJames Simmons if (dev->class) { 64882f0cf9bSJames Simmons sysfs_remove_link(&dev->kobj, "subsystem"); 64982f0cf9bSJames Simmons /* If this is not a "fake" compatible device, remove the 65082f0cf9bSJames Simmons * symlink from the class to the device. */ 65182f0cf9bSJames Simmons if (dev->kobj.parent != &dev->class->subsys.kset.kobj) 65282f0cf9bSJames Simmons sysfs_remove_link(&dev->class->subsys.kset.kobj, 65382f0cf9bSJames Simmons dev->bus_id); 65482f0cf9bSJames Simmons if (parent) { 655f7f3461dSGreg Kroah-Hartman #ifdef CONFIG_SYSFS_DEPRECATED 65682f0cf9bSJames Simmons char *class_name = make_class_name(dev->class->name, 65782f0cf9bSJames Simmons &dev->kobj); 65882f0cf9bSJames Simmons if (class_name) 65982f0cf9bSJames Simmons sysfs_remove_link(&dev->parent->kobj, 66082f0cf9bSJames Simmons class_name); 66182f0cf9bSJames Simmons kfree(class_name); 662f7f3461dSGreg Kroah-Hartman #endif 66382f0cf9bSJames Simmons sysfs_remove_link(&dev->kobj, "device"); 66482f0cf9bSJames Simmons } 66582f0cf9bSJames Simmons 66682f0cf9bSJames Simmons down(&dev->class->sem); 66782f0cf9bSJames Simmons /* notify any interfaces that the device is now gone */ 66882f0cf9bSJames Simmons list_for_each_entry(class_intf, &dev->class->interfaces, node) 66982f0cf9bSJames Simmons if (class_intf->remove_dev) 67082f0cf9bSJames Simmons class_intf->remove_dev(dev, class_intf); 67182f0cf9bSJames Simmons /* remove the device from the class list */ 67282f0cf9bSJames Simmons list_del_init(&dev->node); 67382f0cf9bSJames Simmons up(&dev->class->sem); 67423681e47SGreg Kroah-Hartman } 675a306eea4SCornelia Huck ueventattrError: 676a306eea4SCornelia Huck device_remove_file(dev, &dev->uevent_attr); 67723681e47SGreg Kroah-Hartman attrError: 678312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 6791da177e4SLinus Torvalds kobject_del(&dev->kobj); 6801da177e4SLinus Torvalds Error: 6811da177e4SLinus Torvalds if (parent) 6821da177e4SLinus Torvalds put_device(parent); 6831da177e4SLinus Torvalds goto Done; 6841da177e4SLinus Torvalds } 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds /** 6881da177e4SLinus Torvalds * device_register - register a device with the system. 6891da177e4SLinus Torvalds * @dev: pointer to the device structure 6901da177e4SLinus Torvalds * 6911da177e4SLinus Torvalds * This happens in two clean steps - initialize the device 6921da177e4SLinus Torvalds * and add it to the system. The two steps can be called 6931da177e4SLinus Torvalds * separately, but this is the easiest and most common. 6941da177e4SLinus Torvalds * I.e. you should only call the two helpers separately if 6951da177e4SLinus Torvalds * have a clearly defined need to use and refcount the device 6961da177e4SLinus Torvalds * before it is added to the hierarchy. 6971da177e4SLinus Torvalds */ 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds int device_register(struct device *dev) 7001da177e4SLinus Torvalds { 7011da177e4SLinus Torvalds device_initialize(dev); 7021da177e4SLinus Torvalds return device_add(dev); 7031da177e4SLinus Torvalds } 7041da177e4SLinus Torvalds 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds /** 7071da177e4SLinus Torvalds * get_device - increment reference count for device. 7081da177e4SLinus Torvalds * @dev: device. 7091da177e4SLinus Torvalds * 7101da177e4SLinus Torvalds * This simply forwards the call to kobject_get(), though 7111da177e4SLinus Torvalds * we do take care to provide for the case that we get a NULL 7121da177e4SLinus Torvalds * pointer passed in. 7131da177e4SLinus Torvalds */ 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds struct device * get_device(struct device * dev) 7161da177e4SLinus Torvalds { 7171da177e4SLinus Torvalds return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; 7181da177e4SLinus Torvalds } 7191da177e4SLinus Torvalds 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds /** 7221da177e4SLinus Torvalds * put_device - decrement reference count. 7231da177e4SLinus Torvalds * @dev: device in question. 7241da177e4SLinus Torvalds */ 7251da177e4SLinus Torvalds void put_device(struct device * dev) 7261da177e4SLinus Torvalds { 7271da177e4SLinus Torvalds if (dev) 7281da177e4SLinus Torvalds kobject_put(&dev->kobj); 7291da177e4SLinus Torvalds } 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds 7321da177e4SLinus Torvalds /** 7331da177e4SLinus Torvalds * device_del - delete device from system. 7341da177e4SLinus Torvalds * @dev: device. 7351da177e4SLinus Torvalds * 7361da177e4SLinus Torvalds * This is the first part of the device unregistration 7371da177e4SLinus Torvalds * sequence. This removes the device from the lists we control 7381da177e4SLinus Torvalds * from here, has it removed from the other driver model 7391da177e4SLinus Torvalds * subsystems it was added to in device_add(), and removes it 7401da177e4SLinus Torvalds * from the kobject hierarchy. 7411da177e4SLinus Torvalds * 7421da177e4SLinus Torvalds * NOTE: this should be called manually _iff_ device_add() was 7431da177e4SLinus Torvalds * also called manually. 7441da177e4SLinus Torvalds */ 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvalds void device_del(struct device * dev) 7471da177e4SLinus Torvalds { 7481da177e4SLinus Torvalds struct device * parent = dev->parent; 749c47ed219SGreg Kroah-Hartman struct class_interface *class_intf; 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds if (parent) 752d62c0f9fSPatrick Mochel klist_del(&dev->knode_parent); 75382189b98SCatalin Marinas if (dev->devt_attr) { 75423681e47SGreg Kroah-Hartman device_remove_file(dev, dev->devt_attr); 75582189b98SCatalin Marinas kfree(dev->devt_attr); 75682189b98SCatalin Marinas } 757b9d9c82bSKay Sievers if (dev->class) { 758b9d9c82bSKay Sievers sysfs_remove_link(&dev->kobj, "subsystem"); 75940fa5422SGreg Kroah-Hartman /* If this is not a "fake" compatible device, remove the 76040fa5422SGreg Kroah-Hartman * symlink from the class to the device. */ 76140fa5422SGreg Kroah-Hartman if (dev->kobj.parent != &dev->class->subsys.kset.kobj) 76240fa5422SGreg Kroah-Hartman sysfs_remove_link(&dev->class->subsys.kset.kobj, 76340fa5422SGreg Kroah-Hartman dev->bus_id); 76464bb5d2cSGreg Kroah-Hartman if (parent) { 765f7f3461dSGreg Kroah-Hartman #ifdef CONFIG_SYSFS_DEPRECATED 76699ef3ef8SKay Sievers char *class_name = make_class_name(dev->class->name, 76799ef3ef8SKay Sievers &dev->kobj); 768cb360bbfSCornelia Huck if (class_name) 769cb360bbfSCornelia Huck sysfs_remove_link(&dev->parent->kobj, 770cb360bbfSCornelia Huck class_name); 771e9a7d305SGreg Kroah-Hartman kfree(class_name); 772f7f3461dSGreg Kroah-Hartman #endif 77399ef3ef8SKay Sievers sysfs_remove_link(&dev->kobj, "device"); 77499ef3ef8SKay Sievers } 77599ef3ef8SKay Sievers 7765d9fd169SGreg Kroah-Hartman down(&dev->class->sem); 777c47ed219SGreg Kroah-Hartman /* notify any interfaces that the device is now gone */ 778c47ed219SGreg Kroah-Hartman list_for_each_entry(class_intf, &dev->class->interfaces, node) 779c47ed219SGreg Kroah-Hartman if (class_intf->remove_dev) 780c47ed219SGreg Kroah-Hartman class_intf->remove_dev(dev, class_intf); 781c47ed219SGreg Kroah-Hartman /* remove the device from the class list */ 7825d9fd169SGreg Kroah-Hartman list_del_init(&dev->node); 7835d9fd169SGreg Kroah-Hartman up(&dev->class->sem); 784b9d9c82bSKay Sievers } 785a7fd6706SKay Sievers device_remove_file(dev, &dev->uevent_attr); 786de0ff00dSGreg Kroah-Hartman device_remove_groups(dev); 7872620efefSGreg Kroah-Hartman device_remove_attrs(dev); 78828953533SBenjamin Herrenschmidt bus_remove_device(dev); 7891da177e4SLinus Torvalds 7902f8d16a9STejun Heo /* 7912f8d16a9STejun Heo * Some platform devices are driven without driver attached 7922f8d16a9STejun Heo * and managed resources may have been acquired. Make sure 7932f8d16a9STejun Heo * all resources are released. 7942f8d16a9STejun Heo */ 7952f8d16a9STejun Heo devres_release_all(dev); 7962f8d16a9STejun Heo 7971da177e4SLinus Torvalds /* Notify the platform of the removal, in case they 7981da177e4SLinus Torvalds * need to do anything... 7991da177e4SLinus Torvalds */ 8001da177e4SLinus Torvalds if (platform_notify_remove) 8011da177e4SLinus Torvalds platform_notify_remove(dev); 802116af378SBenjamin Herrenschmidt if (dev->bus) 803116af378SBenjamin Herrenschmidt blocking_notifier_call_chain(&dev->bus->bus_notifier, 804116af378SBenjamin Herrenschmidt BUS_NOTIFY_DEL_DEVICE, dev); 8051da177e4SLinus Torvalds device_pm_remove(dev); 806312c004dSKay Sievers kobject_uevent(&dev->kobj, KOBJ_REMOVE); 8071da177e4SLinus Torvalds kobject_del(&dev->kobj); 8081da177e4SLinus Torvalds if (parent) 8091da177e4SLinus Torvalds put_device(parent); 8101da177e4SLinus Torvalds } 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds /** 8131da177e4SLinus Torvalds * device_unregister - unregister device from system. 8141da177e4SLinus Torvalds * @dev: device going away. 8151da177e4SLinus Torvalds * 8161da177e4SLinus Torvalds * We do this in two parts, like we do device_register(). First, 8171da177e4SLinus Torvalds * we remove it from all the subsystems with device_del(), then 8181da177e4SLinus Torvalds * we decrement the reference count via put_device(). If that 8191da177e4SLinus Torvalds * is the final reference count, the device will be cleaned up 8201da177e4SLinus Torvalds * via device_release() above. Otherwise, the structure will 8211da177e4SLinus Torvalds * stick around until the final reference to the device is dropped. 8221da177e4SLinus Torvalds */ 8231da177e4SLinus Torvalds void device_unregister(struct device * dev) 8241da177e4SLinus Torvalds { 8251da177e4SLinus Torvalds pr_debug("DEV: Unregistering device. ID = '%s'\n", dev->bus_id); 8261da177e4SLinus Torvalds device_del(dev); 8271da177e4SLinus Torvalds put_device(dev); 8281da177e4SLinus Torvalds } 8291da177e4SLinus Torvalds 8301da177e4SLinus Torvalds 83136239577Smochel@digitalimplant.org static struct device * next_device(struct klist_iter * i) 83236239577Smochel@digitalimplant.org { 83336239577Smochel@digitalimplant.org struct klist_node * n = klist_next(i); 83436239577Smochel@digitalimplant.org return n ? container_of(n, struct device, knode_parent) : NULL; 83536239577Smochel@digitalimplant.org } 83636239577Smochel@digitalimplant.org 8371da177e4SLinus Torvalds /** 8381da177e4SLinus Torvalds * device_for_each_child - device child iterator. 839c41455fbSRandy Dunlap * @parent: parent struct device. 8401da177e4SLinus Torvalds * @data: data for the callback. 8411da177e4SLinus Torvalds * @fn: function to be called for each device. 8421da177e4SLinus Torvalds * 843c41455fbSRandy Dunlap * Iterate over @parent's child devices, and call @fn for each, 8441da177e4SLinus Torvalds * passing it @data. 8451da177e4SLinus Torvalds * 8461da177e4SLinus Torvalds * We check the return of @fn each time. If it returns anything 8471da177e4SLinus Torvalds * other than 0, we break out and return that value. 8481da177e4SLinus Torvalds */ 84936239577Smochel@digitalimplant.org int device_for_each_child(struct device * parent, void * data, 8501da177e4SLinus Torvalds int (*fn)(struct device *, void *)) 8511da177e4SLinus Torvalds { 85236239577Smochel@digitalimplant.org struct klist_iter i; 8531da177e4SLinus Torvalds struct device * child; 8541da177e4SLinus Torvalds int error = 0; 8551da177e4SLinus Torvalds 85636239577Smochel@digitalimplant.org klist_iter_init(&parent->klist_children, &i); 85736239577Smochel@digitalimplant.org while ((child = next_device(&i)) && !error) 85836239577Smochel@digitalimplant.org error = fn(child, data); 85936239577Smochel@digitalimplant.org klist_iter_exit(&i); 8601da177e4SLinus Torvalds return error; 8611da177e4SLinus Torvalds } 8621da177e4SLinus Torvalds 8635ab69981SCornelia Huck /** 8645ab69981SCornelia Huck * device_find_child - device iterator for locating a particular device. 8655ab69981SCornelia Huck * @parent: parent struct device 8665ab69981SCornelia Huck * @data: Data to pass to match function 8675ab69981SCornelia Huck * @match: Callback function to check device 8685ab69981SCornelia Huck * 8695ab69981SCornelia Huck * This is similar to the device_for_each_child() function above, but it 8705ab69981SCornelia Huck * returns a reference to a device that is 'found' for later use, as 8715ab69981SCornelia Huck * determined by the @match callback. 8725ab69981SCornelia Huck * 8735ab69981SCornelia Huck * The callback should return 0 if the device doesn't match and non-zero 8745ab69981SCornelia Huck * if it does. If the callback returns non-zero and a reference to the 8755ab69981SCornelia Huck * current device can be obtained, this function will return to the caller 8765ab69981SCornelia Huck * and not iterate over any more devices. 8775ab69981SCornelia Huck */ 8785ab69981SCornelia Huck struct device * device_find_child(struct device *parent, void *data, 8795ab69981SCornelia Huck int (*match)(struct device *, void *)) 8805ab69981SCornelia Huck { 8815ab69981SCornelia Huck struct klist_iter i; 8825ab69981SCornelia Huck struct device *child; 8835ab69981SCornelia Huck 8845ab69981SCornelia Huck if (!parent) 8855ab69981SCornelia Huck return NULL; 8865ab69981SCornelia Huck 8875ab69981SCornelia Huck klist_iter_init(&parent->klist_children, &i); 8885ab69981SCornelia Huck while ((child = next_device(&i))) 8895ab69981SCornelia Huck if (match(child, data) && get_device(child)) 8905ab69981SCornelia Huck break; 8915ab69981SCornelia Huck klist_iter_exit(&i); 8925ab69981SCornelia Huck return child; 8935ab69981SCornelia Huck } 8945ab69981SCornelia Huck 8951da177e4SLinus Torvalds int __init devices_init(void) 8961da177e4SLinus Torvalds { 8971da177e4SLinus Torvalds return subsystem_register(&devices_subsys); 8981da177e4SLinus Torvalds } 8991da177e4SLinus Torvalds 9001da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_for_each_child); 9015ab69981SCornelia Huck EXPORT_SYMBOL_GPL(device_find_child); 9021da177e4SLinus Torvalds 9031da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_initialize); 9041da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_add); 9051da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_register); 9061da177e4SLinus Torvalds 9071da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_del); 9081da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_unregister); 9091da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(get_device); 9101da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(put_device); 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_create_file); 9131da177e4SLinus Torvalds EXPORT_SYMBOL_GPL(device_remove_file); 91423681e47SGreg Kroah-Hartman 91523681e47SGreg Kroah-Hartman 91623681e47SGreg Kroah-Hartman static void device_create_release(struct device *dev) 91723681e47SGreg Kroah-Hartman { 91823681e47SGreg Kroah-Hartman pr_debug("%s called for %s\n", __FUNCTION__, dev->bus_id); 91923681e47SGreg Kroah-Hartman kfree(dev); 92023681e47SGreg Kroah-Hartman } 92123681e47SGreg Kroah-Hartman 92223681e47SGreg Kroah-Hartman /** 92323681e47SGreg Kroah-Hartman * device_create - creates a device and registers it with sysfs 92442734dafSHenrik Kretzschmar * @class: pointer to the struct class that this device should be registered to 92542734dafSHenrik Kretzschmar * @parent: pointer to the parent struct device of this new device, if any 92642734dafSHenrik Kretzschmar * @devt: the dev_t for the char device to be added 92742734dafSHenrik Kretzschmar * @fmt: string for the device's name 92823681e47SGreg Kroah-Hartman * 92942734dafSHenrik Kretzschmar * This function can be used by char device classes. A struct device 93042734dafSHenrik Kretzschmar * will be created in sysfs, registered to the specified class. 93142734dafSHenrik Kretzschmar * 93223681e47SGreg Kroah-Hartman * A "dev" file will be created, showing the dev_t for the device, if 93323681e47SGreg Kroah-Hartman * the dev_t is not 0,0. 93442734dafSHenrik Kretzschmar * If a pointer to a parent struct device is passed in, the newly created 93542734dafSHenrik Kretzschmar * struct device will be a child of that device in sysfs. 93642734dafSHenrik Kretzschmar * The pointer to the struct device will be returned from the call. 93742734dafSHenrik Kretzschmar * Any further sysfs files that might be required can be created using this 93823681e47SGreg Kroah-Hartman * pointer. 93923681e47SGreg Kroah-Hartman * 94023681e47SGreg Kroah-Hartman * Note: the struct class passed to this function must have previously 94123681e47SGreg Kroah-Hartman * been created with a call to class_create(). 94223681e47SGreg Kroah-Hartman */ 94323681e47SGreg Kroah-Hartman struct device *device_create(struct class *class, struct device *parent, 9445cbe5f8aSGreg Kroah-Hartman dev_t devt, const char *fmt, ...) 94523681e47SGreg Kroah-Hartman { 94623681e47SGreg Kroah-Hartman va_list args; 94723681e47SGreg Kroah-Hartman struct device *dev = NULL; 94823681e47SGreg Kroah-Hartman int retval = -ENODEV; 94923681e47SGreg Kroah-Hartman 95023681e47SGreg Kroah-Hartman if (class == NULL || IS_ERR(class)) 95123681e47SGreg Kroah-Hartman goto error; 95223681e47SGreg Kroah-Hartman 95323681e47SGreg Kroah-Hartman dev = kzalloc(sizeof(*dev), GFP_KERNEL); 95423681e47SGreg Kroah-Hartman if (!dev) { 95523681e47SGreg Kroah-Hartman retval = -ENOMEM; 95623681e47SGreg Kroah-Hartman goto error; 95723681e47SGreg Kroah-Hartman } 95823681e47SGreg Kroah-Hartman 95923681e47SGreg Kroah-Hartman dev->devt = devt; 96023681e47SGreg Kroah-Hartman dev->class = class; 96123681e47SGreg Kroah-Hartman dev->parent = parent; 96223681e47SGreg Kroah-Hartman dev->release = device_create_release; 96323681e47SGreg Kroah-Hartman 96423681e47SGreg Kroah-Hartman va_start(args, fmt); 96523681e47SGreg Kroah-Hartman vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args); 96623681e47SGreg Kroah-Hartman va_end(args); 96723681e47SGreg Kroah-Hartman retval = device_register(dev); 96823681e47SGreg Kroah-Hartman if (retval) 96923681e47SGreg Kroah-Hartman goto error; 97023681e47SGreg Kroah-Hartman 97123681e47SGreg Kroah-Hartman return dev; 97223681e47SGreg Kroah-Hartman 97323681e47SGreg Kroah-Hartman error: 97423681e47SGreg Kroah-Hartman kfree(dev); 97523681e47SGreg Kroah-Hartman return ERR_PTR(retval); 97623681e47SGreg Kroah-Hartman } 97723681e47SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_create); 97823681e47SGreg Kroah-Hartman 97923681e47SGreg Kroah-Hartman /** 98023681e47SGreg Kroah-Hartman * device_destroy - removes a device that was created with device_create() 98142734dafSHenrik Kretzschmar * @class: pointer to the struct class that this device was registered with 98242734dafSHenrik Kretzschmar * @devt: the dev_t of the device that was previously registered 98323681e47SGreg Kroah-Hartman * 98442734dafSHenrik Kretzschmar * This call unregisters and cleans up a device that was created with a 98542734dafSHenrik Kretzschmar * call to device_create(). 98623681e47SGreg Kroah-Hartman */ 98723681e47SGreg Kroah-Hartman void device_destroy(struct class *class, dev_t devt) 98823681e47SGreg Kroah-Hartman { 98923681e47SGreg Kroah-Hartman struct device *dev = NULL; 99023681e47SGreg Kroah-Hartman struct device *dev_tmp; 99123681e47SGreg Kroah-Hartman 99223681e47SGreg Kroah-Hartman down(&class->sem); 99323681e47SGreg Kroah-Hartman list_for_each_entry(dev_tmp, &class->devices, node) { 99423681e47SGreg Kroah-Hartman if (dev_tmp->devt == devt) { 99523681e47SGreg Kroah-Hartman dev = dev_tmp; 99623681e47SGreg Kroah-Hartman break; 99723681e47SGreg Kroah-Hartman } 99823681e47SGreg Kroah-Hartman } 99923681e47SGreg Kroah-Hartman up(&class->sem); 100023681e47SGreg Kroah-Hartman 10015d9fd169SGreg Kroah-Hartman if (dev) 100223681e47SGreg Kroah-Hartman device_unregister(dev); 100323681e47SGreg Kroah-Hartman } 100423681e47SGreg Kroah-Hartman EXPORT_SYMBOL_GPL(device_destroy); 1005a2de48caSGreg Kroah-Hartman 1006a2de48caSGreg Kroah-Hartman /** 1007a2de48caSGreg Kroah-Hartman * device_rename - renames a device 1008a2de48caSGreg Kroah-Hartman * @dev: the pointer to the struct device to be renamed 1009a2de48caSGreg Kroah-Hartman * @new_name: the new name of the device 1010a2de48caSGreg Kroah-Hartman */ 1011a2de48caSGreg Kroah-Hartman int device_rename(struct device *dev, char *new_name) 1012a2de48caSGreg Kroah-Hartman { 1013a2de48caSGreg Kroah-Hartman char *old_class_name = NULL; 1014a2de48caSGreg Kroah-Hartman char *new_class_name = NULL; 1015a2de48caSGreg Kroah-Hartman char *old_symlink_name = NULL; 1016a2de48caSGreg Kroah-Hartman int error; 1017a2de48caSGreg Kroah-Hartman 1018a2de48caSGreg Kroah-Hartman dev = get_device(dev); 1019a2de48caSGreg Kroah-Hartman if (!dev) 1020a2de48caSGreg Kroah-Hartman return -EINVAL; 1021a2de48caSGreg Kroah-Hartman 1022a2de48caSGreg Kroah-Hartman pr_debug("DEVICE: renaming '%s' to '%s'\n", dev->bus_id, new_name); 1023a2de48caSGreg Kroah-Hartman 102499ef3ef8SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 1025a2de48caSGreg Kroah-Hartman if ((dev->class) && (dev->parent)) 1026a2de48caSGreg Kroah-Hartman old_class_name = make_class_name(dev->class->name, &dev->kobj); 102799ef3ef8SKay Sievers #endif 1028a2de48caSGreg Kroah-Hartman 1029a2de48caSGreg Kroah-Hartman if (dev->class) { 1030a2de48caSGreg Kroah-Hartman old_symlink_name = kmalloc(BUS_ID_SIZE, GFP_KERNEL); 1031952ab431SJesper Juhl if (!old_symlink_name) { 1032952ab431SJesper Juhl error = -ENOMEM; 1033952ab431SJesper Juhl goto out_free_old_class; 1034952ab431SJesper Juhl } 1035a2de48caSGreg Kroah-Hartman strlcpy(old_symlink_name, dev->bus_id, BUS_ID_SIZE); 1036a2de48caSGreg Kroah-Hartman } 1037a2de48caSGreg Kroah-Hartman 1038a2de48caSGreg Kroah-Hartman strlcpy(dev->bus_id, new_name, BUS_ID_SIZE); 1039a2de48caSGreg Kroah-Hartman 1040a2de48caSGreg Kroah-Hartman error = kobject_rename(&dev->kobj, new_name); 1041a2de48caSGreg Kroah-Hartman 104299ef3ef8SKay Sievers #ifdef CONFIG_SYSFS_DEPRECATED 1043a2de48caSGreg Kroah-Hartman if (old_class_name) { 1044a2de48caSGreg Kroah-Hartman new_class_name = make_class_name(dev->class->name, &dev->kobj); 1045a2de48caSGreg Kroah-Hartman if (new_class_name) { 1046a2de48caSGreg Kroah-Hartman sysfs_create_link(&dev->parent->kobj, &dev->kobj, 1047a2de48caSGreg Kroah-Hartman new_class_name); 1048a2de48caSGreg Kroah-Hartman sysfs_remove_link(&dev->parent->kobj, old_class_name); 1049a2de48caSGreg Kroah-Hartman } 1050a2de48caSGreg Kroah-Hartman } 105199ef3ef8SKay Sievers #endif 105299ef3ef8SKay Sievers 1053a2de48caSGreg Kroah-Hartman if (dev->class) { 1054a2de48caSGreg Kroah-Hartman sysfs_remove_link(&dev->class->subsys.kset.kobj, 1055a2de48caSGreg Kroah-Hartman old_symlink_name); 1056a2de48caSGreg Kroah-Hartman sysfs_create_link(&dev->class->subsys.kset.kobj, &dev->kobj, 1057a2de48caSGreg Kroah-Hartman dev->bus_id); 1058a2de48caSGreg Kroah-Hartman } 1059a2de48caSGreg Kroah-Hartman put_device(dev); 1060a2de48caSGreg Kroah-Hartman 1061a2de48caSGreg Kroah-Hartman kfree(new_class_name); 1062a2de48caSGreg Kroah-Hartman kfree(old_symlink_name); 1063952ab431SJesper Juhl out_free_old_class: 1064952ab431SJesper Juhl kfree(old_class_name); 1065a2de48caSGreg Kroah-Hartman 1066a2de48caSGreg Kroah-Hartman return error; 1067a2de48caSGreg Kroah-Hartman } 1068a2807dbcSJohannes Berg EXPORT_SYMBOL_GPL(device_rename); 10698a82472fSCornelia Huck 10708a82472fSCornelia Huck static int device_move_class_links(struct device *dev, 10718a82472fSCornelia Huck struct device *old_parent, 10728a82472fSCornelia Huck struct device *new_parent) 10738a82472fSCornelia Huck { 1074f7f3461dSGreg Kroah-Hartman int error = 0; 10758a82472fSCornelia Huck #ifdef CONFIG_SYSFS_DEPRECATED 10768a82472fSCornelia Huck char *class_name; 10778a82472fSCornelia Huck 10788a82472fSCornelia Huck class_name = make_class_name(dev->class->name, &dev->kobj); 10798a82472fSCornelia Huck if (!class_name) { 1080cb360bbfSCornelia Huck error = -ENOMEM; 10818a82472fSCornelia Huck goto out; 10828a82472fSCornelia Huck } 10838a82472fSCornelia Huck if (old_parent) { 10848a82472fSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 10858a82472fSCornelia Huck sysfs_remove_link(&old_parent->kobj, class_name); 10868a82472fSCornelia Huck } 1087c744aeaeSCornelia Huck if (new_parent) { 1088c744aeaeSCornelia Huck error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 1089c744aeaeSCornelia Huck "device"); 10908a82472fSCornelia Huck if (error) 10918a82472fSCornelia Huck goto out; 1092c744aeaeSCornelia Huck error = sysfs_create_link(&new_parent->kobj, &dev->kobj, 1093c744aeaeSCornelia Huck class_name); 10948a82472fSCornelia Huck if (error) 10958a82472fSCornelia Huck sysfs_remove_link(&dev->kobj, "device"); 1096c744aeaeSCornelia Huck } 1097c744aeaeSCornelia Huck else 1098c744aeaeSCornelia Huck error = 0; 10998a82472fSCornelia Huck out: 11008a82472fSCornelia Huck kfree(class_name); 11018a82472fSCornelia Huck return error; 11028a82472fSCornelia Huck #else 1103f7f3461dSGreg Kroah-Hartman if (old_parent) 1104f7f3461dSGreg Kroah-Hartman sysfs_remove_link(&dev->kobj, "device"); 1105f7f3461dSGreg Kroah-Hartman if (new_parent) 1106f7f3461dSGreg Kroah-Hartman error = sysfs_create_link(&dev->kobj, &new_parent->kobj, 1107f7f3461dSGreg Kroah-Hartman "device"); 1108f7f3461dSGreg Kroah-Hartman return error; 11098a82472fSCornelia Huck #endif 11108a82472fSCornelia Huck } 11118a82472fSCornelia Huck 11128a82472fSCornelia Huck /** 11138a82472fSCornelia Huck * device_move - moves a device to a new parent 11148a82472fSCornelia Huck * @dev: the pointer to the struct device to be moved 1115c744aeaeSCornelia Huck * @new_parent: the new parent of the device (can by NULL) 11168a82472fSCornelia Huck */ 11178a82472fSCornelia Huck int device_move(struct device *dev, struct device *new_parent) 11188a82472fSCornelia Huck { 11198a82472fSCornelia Huck int error; 11208a82472fSCornelia Huck struct device *old_parent; 1121c744aeaeSCornelia Huck struct kobject *new_parent_kobj; 11228a82472fSCornelia Huck 11238a82472fSCornelia Huck dev = get_device(dev); 11248a82472fSCornelia Huck if (!dev) 11258a82472fSCornelia Huck return -EINVAL; 11268a82472fSCornelia Huck 11278a82472fSCornelia Huck new_parent = get_device(new_parent); 1128c744aeaeSCornelia Huck new_parent_kobj = get_device_parent (dev, new_parent); 1129c744aeaeSCornelia Huck if (IS_ERR(new_parent_kobj)) { 1130c744aeaeSCornelia Huck error = PTR_ERR(new_parent_kobj); 1131c744aeaeSCornelia Huck put_device(new_parent); 11328a82472fSCornelia Huck goto out; 11338a82472fSCornelia Huck } 11348a82472fSCornelia Huck pr_debug("DEVICE: moving '%s' to '%s'\n", dev->bus_id, 1135c744aeaeSCornelia Huck new_parent ? new_parent->bus_id : "<NULL>"); 1136c744aeaeSCornelia Huck error = kobject_move(&dev->kobj, new_parent_kobj); 11378a82472fSCornelia Huck if (error) { 11388a82472fSCornelia Huck put_device(new_parent); 11398a82472fSCornelia Huck goto out; 11408a82472fSCornelia Huck } 11418a82472fSCornelia Huck old_parent = dev->parent; 11428a82472fSCornelia Huck dev->parent = new_parent; 11438a82472fSCornelia Huck if (old_parent) 1144acf02d23SCornelia Huck klist_remove(&dev->knode_parent); 1145c744aeaeSCornelia Huck if (new_parent) 11468a82472fSCornelia Huck klist_add_tail(&dev->knode_parent, &new_parent->klist_children); 11478a82472fSCornelia Huck if (!dev->class) 11488a82472fSCornelia Huck goto out_put; 11498a82472fSCornelia Huck error = device_move_class_links(dev, old_parent, new_parent); 11508a82472fSCornelia Huck if (error) { 11518a82472fSCornelia Huck /* We ignore errors on cleanup since we're hosed anyway... */ 11528a82472fSCornelia Huck device_move_class_links(dev, new_parent, old_parent); 11538a82472fSCornelia Huck if (!kobject_move(&dev->kobj, &old_parent->kobj)) { 1154c744aeaeSCornelia Huck if (new_parent) 1155acf02d23SCornelia Huck klist_remove(&dev->knode_parent); 11568a82472fSCornelia Huck if (old_parent) 11578a82472fSCornelia Huck klist_add_tail(&dev->knode_parent, 11588a82472fSCornelia Huck &old_parent->klist_children); 11598a82472fSCornelia Huck } 11608a82472fSCornelia Huck put_device(new_parent); 11618a82472fSCornelia Huck goto out; 11628a82472fSCornelia Huck } 11638a82472fSCornelia Huck out_put: 11648a82472fSCornelia Huck put_device(old_parent); 11658a82472fSCornelia Huck out: 11668a82472fSCornelia Huck put_device(dev); 11678a82472fSCornelia Huck return error; 11688a82472fSCornelia Huck } 11698a82472fSCornelia Huck 11708a82472fSCornelia Huck EXPORT_SYMBOL_GPL(device_move); 1171