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drivers/base/core.c
46.8 KB
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/* * drivers/base/core.c - core driver model code (device registration, etc) * * Copyright (c) 2002-3 Patrick Mochel * Copyright (c) 2002-3 Open Source Development Labs |
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* Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> * Copyright (c) 2006 Novell, Inc. |
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* * This file is released under the GPLv2 * */ |
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#include <linux/device.h> #include <linux/err.h> #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/string.h> |
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#include <linux/kdev_t.h> |
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#include <linux/notifier.h> |
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#include <linux/genhd.h> |
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#include <linux/kallsyms.h> |
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#include <linux/mutex.h> |
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#include <linux/async.h> |
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#include "base.h" #include "power/power.h" |
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int (*platform_notify)(struct device *dev) = NULL; int (*platform_notify_remove)(struct device *dev) = NULL; |
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static struct kobject *dev_kobj; struct kobject *sysfs_dev_char_kobj; struct kobject *sysfs_dev_block_kobj; |
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#ifdef CONFIG_BLOCK static inline int device_is_not_partition(struct device *dev) { return !(dev->type == &part_type); } #else static inline int device_is_not_partition(struct device *dev) { return 1; } #endif |
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/** * dev_driver_string - Return a device's driver name, if at all possible * @dev: struct device to get the name of * * Will return the device's driver's name if it is bound to a device. If * the device is not bound to a device, it will return the name of the bus * it is attached to. If it is not attached to a bus either, an empty * string will be returned. */ |
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const char *dev_driver_string(const struct device *dev) |
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{ |
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struct device_driver *drv; /* dev->driver can change to NULL underneath us because of unbinding, * so be careful about accessing it. dev->bus and dev->class should * never change once they are set, so they don't need special care. */ drv = ACCESS_ONCE(dev->driver); return drv ? drv->name : |
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(dev->bus ? dev->bus->name : (dev->class ? dev->class->name : "")); |
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} |
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EXPORT_SYMBOL(dev_driver_string); |
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#define to_dev(obj) container_of(obj, struct device, kobj) #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
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static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) |
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{ |
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struct device_attribute *dev_attr = to_dev_attr(attr); struct device *dev = to_dev(kobj); |
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ssize_t ret = -EIO; |
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if (dev_attr->show) |
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ret = dev_attr->show(dev, dev_attr, buf); |
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if (ret >= (ssize_t)PAGE_SIZE) { print_symbol("dev_attr_show: %s returned bad count ", (unsigned long)dev_attr->show); } |
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return ret; } |
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static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, const char *buf, size_t count) |
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{ |
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struct device_attribute *dev_attr = to_dev_attr(attr); struct device *dev = to_dev(kobj); |
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ssize_t ret = -EIO; |
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if (dev_attr->store) |
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ret = dev_attr->store(dev, dev_attr, buf, count); |
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return ret; } |
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static const struct sysfs_ops dev_sysfs_ops = { |
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.show = dev_attr_show, .store = dev_attr_store, }; /** * device_release - free device structure. * @kobj: device's kobject. * * This is called once the reference count for the object * reaches 0. We forward the call to the device's release * method, which should handle actually freeing the structure. */ |
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static void device_release(struct kobject *kobj) |
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{ |
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struct device *dev = to_dev(kobj); |
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struct device_private *p = dev->p; |
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if (dev->release) dev->release(dev); |
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else if (dev->type && dev->type->release) dev->type->release(dev); |
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else if (dev->class && dev->class->dev_release) dev->class->dev_release(dev); |
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else WARN(1, KERN_ERR "Device '%s' does not have a release() " |
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"function, it is broken and must be fixed. ", |
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dev_name(dev)); |
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kfree(p); |
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} |
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static const void *device_namespace(struct kobject *kobj) { struct device *dev = to_dev(kobj); const void *ns = NULL; if (dev->class && dev->class->ns_type) ns = dev->class->namespace(dev); return ns; } |
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static struct kobj_type device_ktype = { |
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.release = device_release, .sysfs_ops = &dev_sysfs_ops, |
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.namespace = device_namespace, |
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}; |
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static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
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{ struct kobj_type *ktype = get_ktype(kobj); |
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if (ktype == &device_ktype) { |
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struct device *dev = to_dev(kobj); if (dev->bus) return 1; |
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if (dev->class) return 1; |
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} return 0; } |
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static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
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{ struct device *dev = to_dev(kobj); |
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if (dev->bus) return dev->bus->name; if (dev->class) return dev->class->name; return NULL; |
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} |
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static int dev_uevent(struct kset *kset, struct kobject *kobj, struct kobj_uevent_env *env) |
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{ struct device *dev = to_dev(kobj); |
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int retval = 0; |
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/* add device node properties if present */ |
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if (MAJOR(dev->devt)) { |
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const char *tmp; const char *name; |
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mode_t mode = 0; |
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add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); |
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name = device_get_devnode(dev, &mode, &tmp); |
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if (name) { add_uevent_var(env, "DEVNAME=%s", name); kfree(tmp); |
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if (mode) add_uevent_var(env, "DEVMODE=%#o", mode & 0777); |
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} |
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} |
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if (dev->type && dev->type->name) |
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add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
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if (dev->driver) |
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add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
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|
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#ifdef CONFIG_SYSFS_DEPRECATED |
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if (dev->class) { struct device *parent = dev->parent; /* find first bus device in parent chain */ while (parent && !parent->bus) parent = parent->parent; if (parent && parent->bus) { const char *path; path = kobject_get_path(&parent->kobj, GFP_KERNEL); |
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if (path) { |
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add_uevent_var(env, "PHYSDEVPATH=%s", path); |
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kfree(path); } |
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add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name); |
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if (parent->driver) |
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add_uevent_var(env, "PHYSDEVDRIVER=%s", parent->driver->name); |
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} } else if (dev->bus) { |
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add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name); |
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if (dev->driver) |
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add_uevent_var(env, "PHYSDEVDRIVER=%s", dev->driver->name); |
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} |
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#endif |
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/* have the bus specific function add its stuff */ |
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if (dev->bus && dev->bus->uevent) { |
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retval = dev->bus->uevent(dev, env); |
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if (retval) |
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pr_debug("device: '%s': %s: bus uevent() returned %d ", |
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dev_name(dev), __func__, retval); |
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} |
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/* have the class specific function add its stuff */ |
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if (dev->class && dev->class->dev_uevent) { |
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retval = dev->class->dev_uevent(dev, env); |
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if (retval) |
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pr_debug("device: '%s': %s: class uevent() " |
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"returned %d ", dev_name(dev), |
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__func__, retval); |
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} |
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/* have the device type specific function add its stuff */ |
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if (dev->type && dev->type->uevent) { |
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retval = dev->type->uevent(dev, env); |
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if (retval) |
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pr_debug("device: '%s': %s: dev_type uevent() " |
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"returned %d ", dev_name(dev), |
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__func__, retval); |
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} |
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return retval; } |
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static const struct kset_uevent_ops device_uevent_ops = { |
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.filter = dev_uevent_filter, .name = dev_uevent_name, .uevent = dev_uevent, |
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}; |
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static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, char *buf) { struct kobject *top_kobj; struct kset *kset; |
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struct kobj_uevent_env *env = NULL; |
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int i; size_t count = 0; int retval; /* search the kset, the device belongs to */ top_kobj = &dev->kobj; |
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while (!top_kobj->kset && top_kobj->parent) top_kobj = top_kobj->parent; |
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if (!top_kobj->kset) goto out; |
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|
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kset = top_kobj->kset; if (!kset->uevent_ops || !kset->uevent_ops->uevent) goto out; /* respect filter */ if (kset->uevent_ops && kset->uevent_ops->filter) if (!kset->uevent_ops->filter(kset, &dev->kobj)) goto out; |
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env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); if (!env) |
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return -ENOMEM; |
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/* let the kset specific function add its keys */ |
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retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
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if (retval) goto out; /* copy keys to file */ |
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for (i = 0; i < env->envp_idx; i++) count += sprintf(&buf[count], "%s ", env->envp[i]); |
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out: |
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kfree(env); |
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return count; } |
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static ssize_t store_uevent(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { |
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enum kobject_action action; |
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if (kobject_action_type(buf, count, &action) == 0) |
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kobject_uevent(&dev->kobj, action); |
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else dev_err(dev, "uevent: unknown action-string "); |
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return count; } |
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static struct device_attribute uevent_attr = __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); |
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static int device_add_attributes(struct device *dev, struct device_attribute *attrs) |
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{ |
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int error = 0; |
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int i; |
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if (attrs) { for (i = 0; attr_name(attrs[i]); i++) { error = device_create_file(dev, &attrs[i]); if (error) break; } if (error) while (--i >= 0) device_remove_file(dev, &attrs[i]); } return error; } static void device_remove_attributes(struct device *dev, struct device_attribute *attrs) { int i; if (attrs) for (i = 0; attr_name(attrs[i]); i++) device_remove_file(dev, &attrs[i]); } static int device_add_groups(struct device *dev, |
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const struct attribute_group **groups) |
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{ |
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int error = 0; |
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int i; |
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if (groups) { for (i = 0; groups[i]; i++) { error = sysfs_create_group(&dev->kobj, groups[i]); |
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if (error) { while (--i >= 0) |
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sysfs_remove_group(&dev->kobj, groups[i]); |
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break; |
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} } } |
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return error; } |
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static void device_remove_groups(struct device *dev, |
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const struct attribute_group **groups) |
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{ int i; |
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if (groups) for (i = 0; groups[i]; i++) sysfs_remove_group(&dev->kobj, groups[i]); |
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} |
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static int device_add_attrs(struct device *dev) { struct class *class = dev->class; |
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struct device_type *type = dev->type; |
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int error; |
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if (class) { error = device_add_attributes(dev, class->dev_attrs); |
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if (error) |
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return error; |
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} |
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if (type) { error = device_add_groups(dev, type->groups); |
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if (error) |
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goto err_remove_class_attrs; |
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} |
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error = device_add_groups(dev, dev->groups); if (error) goto err_remove_type_groups; return 0; err_remove_type_groups: if (type) device_remove_groups(dev, type->groups); err_remove_class_attrs: if (class) device_remove_attributes(dev, class->dev_attrs); |
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return error; } static void device_remove_attrs(struct device *dev) { struct class *class = dev->class; |
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struct device_type *type = dev->type; |
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device_remove_groups(dev, dev->groups); |
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if (type) device_remove_groups(dev, type->groups); if (class) device_remove_attributes(dev, class->dev_attrs); |
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} |
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static ssize_t show_dev(struct device *dev, struct device_attribute *attr, char *buf) { return print_dev_t(buf, dev->devt); } |
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static struct device_attribute devt_attr = __ATTR(dev, S_IRUGO, show_dev, NULL); |
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/* kset to create /sys/devices/ */ struct kset *devices_kset; |
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|
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/** |
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* device_create_file - create sysfs attribute file for device. * @dev: device. * @attr: device attribute descriptor. |
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*/ |
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int device_create_file(struct device *dev, const struct device_attribute *attr) |
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{ int error = 0; |
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if (dev) |
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error = sysfs_create_file(&dev->kobj, &attr->attr); |
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return error; } /** |
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* device_remove_file - remove sysfs attribute file. * @dev: device. * @attr: device attribute descriptor. |
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*/ |
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void device_remove_file(struct device *dev, const struct device_attribute *attr) |
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{ |
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if (dev) |
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sysfs_remove_file(&dev->kobj, &attr->attr); |
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} |
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/** * device_create_bin_file - create sysfs binary attribute file for device. * @dev: device. * @attr: device binary attribute descriptor. */ |
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int device_create_bin_file(struct device *dev, const struct bin_attribute *attr) |
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{ int error = -EINVAL; if (dev) error = sysfs_create_bin_file(&dev->kobj, attr); return error; } EXPORT_SYMBOL_GPL(device_create_bin_file); /** * device_remove_bin_file - remove sysfs binary attribute file * @dev: device. * @attr: device binary attribute descriptor. */ |
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void device_remove_bin_file(struct device *dev, const struct bin_attribute *attr) |
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{ if (dev) sysfs_remove_bin_file(&dev->kobj, attr); } EXPORT_SYMBOL_GPL(device_remove_bin_file); |
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/** |
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* device_schedule_callback_owner - helper to schedule a callback for a device |
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* @dev: device. * @func: callback function to invoke later. |
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* @owner: module owning the callback routine |
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* * Attribute methods must not unregister themselves or their parent device * (which would amount to the same thing). Attempts to do so will deadlock, * since unregistration is mutually exclusive with driver callbacks. * * Instead methods can call this routine, which will attempt to allocate * and schedule a workqueue request to call back @func with @dev as its * argument in the workqueue's process context. @dev will be pinned until * @func returns. * |
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* This routine is usually called via the inline device_schedule_callback(), * which automatically sets @owner to THIS_MODULE. * |
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* Returns 0 if the request was submitted, -ENOMEM if storage could not |
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|
494 |
* be allocated, -ENODEV if a reference to @owner isn't available. |
d9a9cdfb0
|
495 496 497 498 499 |
* * NOTE: This routine won't work if CONFIG_SYSFS isn't set! It uses an * underlying sysfs routine (since it is intended for use by attribute * methods), and if sysfs isn't available you'll get nothing but -ENOSYS. */ |
523ded71d
|
500 501 |
int device_schedule_callback_owner(struct device *dev, void (*func)(struct device *), struct module *owner) |
d9a9cdfb0
|
502 503 |
{ return sysfs_schedule_callback(&dev->kobj, |
523ded71d
|
504 |
(void (*)(void *)) func, dev, owner); |
d9a9cdfb0
|
505 |
} |
523ded71d
|
506 |
EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
d9a9cdfb0
|
507 |
|
34bb61f9d
|
508 509 |
static void klist_children_get(struct klist_node *n) { |
f791b8c83
|
510 511 |
struct device_private *p = to_device_private_parent(n); struct device *dev = p->device; |
34bb61f9d
|
512 513 514 515 516 517 |
get_device(dev); } static void klist_children_put(struct klist_node *n) { |
f791b8c83
|
518 519 |
struct device_private *p = to_device_private_parent(n); struct device *dev = p->device; |
34bb61f9d
|
520 521 522 |
put_device(dev); } |
1da177e4c
|
523 |
/** |
4a3ad20cc
|
524 525 |
* device_initialize - init device structure. * @dev: device. |
1da177e4c
|
526 |
* |
5739411ac
|
527 528 |
* This prepares the device for use by other layers by initializing * its fields. |
4a3ad20cc
|
529 |
* It is the first half of device_register(), if called by |
5739411ac
|
530 531 532 533 534 535 536 |
* that function, though it can also be called separately, so one * may use @dev's fields. In particular, get_device()/put_device() * may be used for reference counting of @dev after calling this * function. * * NOTE: Use put_device() to give up your reference instead of freeing * @dev directly once you have called this function. |
1da177e4c
|
537 |
*/ |
1da177e4c
|
538 539 |
void device_initialize(struct device *dev) { |
881c6cfd7
|
540 |
dev->kobj.kset = devices_kset; |
f9cb074bf
|
541 |
kobject_init(&dev->kobj, &device_ktype); |
1da177e4c
|
542 |
INIT_LIST_HEAD(&dev->dma_pools); |
3142788b7
|
543 |
mutex_init(&dev->mutex); |
1704f47b5
|
544 |
lockdep_set_novalidate_class(&dev->mutex); |
9ac7849e3
|
545 546 |
spin_lock_init(&dev->devres_lock); INIT_LIST_HEAD(&dev->devres_head); |
3b98aeaf3
|
547 |
device_pm_init(dev); |
873481367
|
548 |
set_dev_node(dev, -1); |
1da177e4c
|
549 |
} |
40fa54226
|
550 |
#ifdef CONFIG_SYSFS_DEPRECATED |
da231fd5d
|
551 552 |
static struct kobject *get_device_parent(struct device *dev, struct device *parent) |
40fa54226
|
553 |
{ |
da231fd5d
|
554 |
/* class devices without a parent live in /sys/class/<classname>/ */ |
3eb215de2
|
555 |
if (dev->class && (!parent || parent->class != dev->class)) |
1fbfee6c6
|
556 |
return &dev->class->p->class_subsys.kobj; |
da231fd5d
|
557 |
/* all other devices keep their parent */ |
40fa54226
|
558 |
else if (parent) |
c744aeae9
|
559 |
return &parent->kobj; |
40fa54226
|
560 |
|
c744aeae9
|
561 |
return NULL; |
40fa54226
|
562 |
} |
da231fd5d
|
563 564 |
static inline void cleanup_device_parent(struct device *dev) {} |
63b6971a0
|
565 566 |
static inline void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) {} |
40fa54226
|
567 |
#else |
864062457
|
568 |
static struct kobject *virtual_device_parent(struct device *dev) |
f0ee61a6c
|
569 |
{ |
864062457
|
570 |
static struct kobject *virtual_dir = NULL; |
f0ee61a6c
|
571 |
|
864062457
|
572 |
if (!virtual_dir) |
4ff6abff8
|
573 |
virtual_dir = kobject_create_and_add("virtual", |
881c6cfd7
|
574 |
&devices_kset->kobj); |
f0ee61a6c
|
575 |
|
864062457
|
576 |
return virtual_dir; |
f0ee61a6c
|
577 |
} |
bc451f205
|
578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 |
struct class_dir { struct kobject kobj; struct class *class; }; #define to_class_dir(obj) container_of(obj, struct class_dir, kobj) static void class_dir_release(struct kobject *kobj) { struct class_dir *dir = to_class_dir(kobj); kfree(dir); } static const struct kobj_ns_type_operations *class_dir_child_ns_type(struct kobject *kobj) |
40fa54226
|
593 |
{ |
bc451f205
|
594 595 596 597 598 599 600 601 602 603 604 605 606 607 |
struct class_dir *dir = to_class_dir(kobj); return dir->class->ns_type; } static struct kobj_type class_dir_ktype = { .release = class_dir_release, .sysfs_ops = &kobj_sysfs_ops, .child_ns_type = class_dir_child_ns_type }; static struct kobject * class_dir_create_and_add(struct class *class, struct kobject *parent_kobj) { struct class_dir *dir; |
43968d2f1
|
608 |
int retval; |
bc451f205
|
609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 |
dir = kzalloc(sizeof(*dir), GFP_KERNEL); if (!dir) return NULL; dir->class = class; kobject_init(&dir->kobj, &class_dir_ktype); dir->kobj.kset = &class->p->class_dirs; retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); if (retval < 0) { kobject_put(&dir->kobj); return NULL; } return &dir->kobj; } static struct kobject *get_device_parent(struct device *dev, struct device *parent) { |
864062457
|
630 |
if (dev->class) { |
77d3d7c1d
|
631 |
static DEFINE_MUTEX(gdp_mutex); |
864062457
|
632 633 634 635 636 637 |
struct kobject *kobj = NULL; struct kobject *parent_kobj; struct kobject *k; /* * If we have no parent, we live in "virtual". |
0f4dafc05
|
638 639 |
* Class-devices with a non class-device as parent, live * in a "glue" directory to prevent namespace collisions. |
864062457
|
640 641 642 |
*/ if (parent == NULL) parent_kobj = virtual_device_parent(dev); |
24b1442d0
|
643 |
else if (parent->class && !dev->class->ns_type) |
864062457
|
644 645 646 |
return &parent->kobj; else parent_kobj = &parent->kobj; |
77d3d7c1d
|
647 |
mutex_lock(&gdp_mutex); |
864062457
|
648 |
/* find our class-directory at the parent and reference it */ |
7c71448b8
|
649 650 |
spin_lock(&dev->class->p->class_dirs.list_lock); list_for_each_entry(k, &dev->class->p->class_dirs.list, entry) |
864062457
|
651 652 653 654 |
if (k->parent == parent_kobj) { kobj = kobject_get(k); break; } |
7c71448b8
|
655 |
spin_unlock(&dev->class->p->class_dirs.list_lock); |
77d3d7c1d
|
656 657 |
if (kobj) { mutex_unlock(&gdp_mutex); |
864062457
|
658 |
return kobj; |
77d3d7c1d
|
659 |
} |
864062457
|
660 661 |
/* or create a new class-directory at the parent device */ |
bc451f205
|
662 |
k = class_dir_create_and_add(dev->class, parent_kobj); |
0f4dafc05
|
663 |
/* do not emit an uevent for this simple "glue" directory */ |
77d3d7c1d
|
664 |
mutex_unlock(&gdp_mutex); |
43968d2f1
|
665 |
return k; |
864062457
|
666 667 668 |
} if (parent) |
c744aeae9
|
669 670 671 |
return &parent->kobj; return NULL; } |
da231fd5d
|
672 |
|
63b6971a0
|
673 |
static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
da231fd5d
|
674 |
{ |
0f4dafc05
|
675 |
/* see if we live in a "glue" directory */ |
c1fe539a7
|
676 |
if (!glue_dir || !dev->class || |
7c71448b8
|
677 |
glue_dir->kset != &dev->class->p->class_dirs) |
da231fd5d
|
678 |
return; |
0f4dafc05
|
679 |
kobject_put(glue_dir); |
da231fd5d
|
680 |
} |
63b6971a0
|
681 682 683 684 685 |
static void cleanup_device_parent(struct device *dev) { cleanup_glue_dir(dev, dev->kobj.parent); } |
c744aeae9
|
686 |
#endif |
864062457
|
687 |
|
63b6971a0
|
688 |
static void setup_parent(struct device *dev, struct device *parent) |
c744aeae9
|
689 690 691 |
{ struct kobject *kobj; kobj = get_device_parent(dev, parent); |
c744aeae9
|
692 693 |
if (kobj) dev->kobj.parent = kobj; |
40fa54226
|
694 |
} |
40fa54226
|
695 |
|
2ee97caf0
|
696 697 698 699 700 701 |
static int device_add_class_symlinks(struct device *dev) { int error; if (!dev->class) return 0; |
da231fd5d
|
702 |
|
1fbfee6c6
|
703 704 |
error = sysfs_create_link(&dev->kobj, &dev->class->p->class_subsys.kobj, |
2ee97caf0
|
705 706 707 |
"subsystem"); if (error) goto out; |
da231fd5d
|
708 709 710 |
#ifdef CONFIG_SYSFS_DEPRECATED /* stacked class devices need a symlink in the class directory */ |
1fbfee6c6
|
711 |
if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c296
|
712 |
device_is_not_partition(dev)) { |
1fbfee6c6
|
713 |
error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf93
|
714 |
&dev->kobj, dev_name(dev)); |
2ee97caf0
|
715 716 717 |
if (error) goto out_subsys; } |
da231fd5d
|
718 |
|
4e886c296
|
719 |
if (dev->parent && device_is_not_partition(dev)) { |
da231fd5d
|
720 721 |
struct device *parent = dev->parent; char *class_name; |
4f01a757e
|
722 |
|
da231fd5d
|
723 724 725 726 727 728 729 730 731 |
/* * stacked class devices have the 'device' link * pointing to the bus device instead of the parent */ while (parent->class && !parent->bus && parent->parent) parent = parent->parent; error = sysfs_create_link(&dev->kobj, &parent->kobj, |
4f01a757e
|
732 733 734 |
"device"); if (error) goto out_busid; |
da231fd5d
|
735 736 737 738 739 740 741 742 743 |
class_name = make_class_name(dev->class->name, &dev->kobj); if (class_name) error = sysfs_create_link(&dev->parent->kobj, &dev->kobj, class_name); kfree(class_name); if (error) goto out_device; |
2ee97caf0
|
744 745 |
} return 0; |
2ee97caf0
|
746 |
out_device: |
4e886c296
|
747 |
if (dev->parent && device_is_not_partition(dev)) |
2ee97caf0
|
748 |
sysfs_remove_link(&dev->kobj, "device"); |
2ee97caf0
|
749 |
out_busid: |
1fbfee6c6
|
750 |
if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c296
|
751 |
device_is_not_partition(dev)) |
f349cf347
|
752 |
sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, |
1e0b2cf93
|
753 |
dev_name(dev)); |
da231fd5d
|
754 755 |
#else /* link in the class directory pointing to the device */ |
1fbfee6c6
|
756 |
error = sysfs_create_link(&dev->class->p->class_subsys.kobj, |
1e0b2cf93
|
757 |
&dev->kobj, dev_name(dev)); |
da231fd5d
|
758 759 |
if (error) goto out_subsys; |
4e886c296
|
760 |
if (dev->parent && device_is_not_partition(dev)) { |
da231fd5d
|
761 762 763 764 765 766 767 768 |
error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, "device"); if (error) goto out_busid; } return 0; out_busid: |
f349cf347
|
769 |
sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev)); |
da231fd5d
|
770 |
#endif |
2ee97caf0
|
771 772 773 774 775 776 777 778 779 780 |
out_subsys: sysfs_remove_link(&dev->kobj, "subsystem"); out: return error; } static void device_remove_class_symlinks(struct device *dev) { if (!dev->class) return; |
da231fd5d
|
781 |
|
2ee97caf0
|
782 |
#ifdef CONFIG_SYSFS_DEPRECATED |
4e886c296
|
783 |
if (dev->parent && device_is_not_partition(dev)) { |
2ee97caf0
|
784 785 786 787 788 789 790 |
char *class_name; class_name = make_class_name(dev->class->name, &dev->kobj); if (class_name) { sysfs_remove_link(&dev->parent->kobj, class_name); kfree(class_name); } |
2ee97caf0
|
791 792 |
sysfs_remove_link(&dev->kobj, "device"); } |
da231fd5d
|
793 |
|
1fbfee6c6
|
794 |
if (dev->kobj.parent != &dev->class->p->class_subsys.kobj && |
4e886c296
|
795 |
device_is_not_partition(dev)) |
f349cf347
|
796 |
sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, |
1e0b2cf93
|
797 |
dev_name(dev)); |
da231fd5d
|
798 |
#else |
4e886c296
|
799 |
if (dev->parent && device_is_not_partition(dev)) |
da231fd5d
|
800 |
sysfs_remove_link(&dev->kobj, "device"); |
f349cf347
|
801 |
sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev)); |
da231fd5d
|
802 |
#endif |
2ee97caf0
|
803 804 |
sysfs_remove_link(&dev->kobj, "subsystem"); } |
1da177e4c
|
805 |
/** |
413c239fa
|
806 807 |
* dev_set_name - set a device name * @dev: device |
462323661
|
808 |
* @fmt: format string for the device's name |
413c239fa
|
809 810 811 812 |
*/ int dev_set_name(struct device *dev, const char *fmt, ...) { va_list vargs; |
1fa5ae857
|
813 |
int err; |
413c239fa
|
814 815 |
va_start(vargs, fmt); |
1fa5ae857
|
816 |
err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
413c239fa
|
817 |
va_end(vargs); |
1fa5ae857
|
818 |
return err; |
413c239fa
|
819 820 821 822 |
} EXPORT_SYMBOL_GPL(dev_set_name); /** |
e105b8bfc
|
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 |
* device_to_dev_kobj - select a /sys/dev/ directory for the device * @dev: device * * By default we select char/ for new entries. Setting class->dev_obj * to NULL prevents an entry from being created. class->dev_kobj must * be set (or cleared) before any devices are registered to the class * otherwise device_create_sys_dev_entry() and * device_remove_sys_dev_entry() will disagree about the the presence * of the link. */ static struct kobject *device_to_dev_kobj(struct device *dev) { struct kobject *kobj; if (dev->class) kobj = dev->class->dev_kobj; else kobj = sysfs_dev_char_kobj; return kobj; } static int device_create_sys_dev_entry(struct device *dev) { struct kobject *kobj = device_to_dev_kobj(dev); int error = 0; char devt_str[15]; if (kobj) { format_dev_t(devt_str, dev->devt); error = sysfs_create_link(kobj, &dev->kobj, devt_str); } return error; } static void device_remove_sys_dev_entry(struct device *dev) { struct kobject *kobj = device_to_dev_kobj(dev); char devt_str[15]; if (kobj) { format_dev_t(devt_str, dev->devt); sysfs_remove_link(kobj, devt_str); } } |
b40284378
|
869 870 871 872 873 874 875 876 877 878 |
int device_private_init(struct device *dev) { dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL); if (!dev->p) return -ENOMEM; dev->p->device = dev; klist_init(&dev->p->klist_children, klist_children_get, klist_children_put); return 0; } |
e105b8bfc
|
879 |
/** |
4a3ad20cc
|
880 881 |
* device_add - add device to device hierarchy. * @dev: device. |
1da177e4c
|
882 |
* |
4a3ad20cc
|
883 884 |
* This is part 2 of device_register(), though may be called * separately _iff_ device_initialize() has been called separately. |
1da177e4c
|
885 |
* |
5739411ac
|
886 |
* This adds @dev to the kobject hierarchy via kobject_add(), adds it |
4a3ad20cc
|
887 888 |
* to the global and sibling lists for the device, then * adds it to the other relevant subsystems of the driver model. |
5739411ac
|
889 890 891 892 |
* * NOTE: _Never_ directly free @dev after calling this function, even * if it returned an error! Always use put_device() to give up your * reference instead. |
1da177e4c
|
893 894 895 896 |
*/ int device_add(struct device *dev) { struct device *parent = NULL; |
c47ed219b
|
897 |
struct class_interface *class_intf; |
c906a48ad
|
898 |
int error = -EINVAL; |
775b64d2b
|
899 |
|
1da177e4c
|
900 |
dev = get_device(dev); |
c906a48ad
|
901 902 |
if (!dev) goto done; |
fb069a5d1
|
903 |
if (!dev->p) { |
b40284378
|
904 905 906 |
error = device_private_init(dev); if (error) goto done; |
fb069a5d1
|
907 |
} |
fb069a5d1
|
908 |
|
1fa5ae857
|
909 910 911 912 913 914 |
/* * for statically allocated devices, which should all be converted * some day, we need to initialize the name. We prevent reading back * the name, and force the use of dev_name() */ if (dev->init_name) { |
acc0e90fb
|
915 |
dev_set_name(dev, "%s", dev->init_name); |
1fa5ae857
|
916 917 |
dev->init_name = NULL; } |
c906a48ad
|
918 |
|
e6309e756
|
919 920 |
if (!dev_name(dev)) { error = -EINVAL; |
5c8563d77
|
921 |
goto name_error; |
e6309e756
|
922 |
} |
1da177e4c
|
923 |
|
1e0b2cf93
|
924 925 |
pr_debug("device: '%s': %s ", dev_name(dev), __func__); |
c205ef488
|
926 |
|
1da177e4c
|
927 |
parent = get_device(dev->parent); |
63b6971a0
|
928 |
setup_parent(dev, parent); |
1da177e4c
|
929 |
|
0d358f22f
|
930 931 932 |
/* use parent numa_node */ if (parent) set_dev_node(dev, dev_to_node(parent)); |
1da177e4c
|
933 |
/* first, register with generic layer. */ |
8a577ffc7
|
934 935 |
/* we require the name to be set before, and pass NULL */ error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); |
40fa54226
|
936 |
if (error) |
1da177e4c
|
937 |
goto Error; |
a7fd67062
|
938 |
|
370226449
|
939 940 941 |
/* notify platform of device entry */ if (platform_notify) platform_notify(dev); |
ad6a1e1c6
|
942 |
error = device_create_file(dev, &uevent_attr); |
a306eea40
|
943 944 |
if (error) goto attrError; |
a7fd67062
|
945 |
|
23681e479
|
946 |
if (MAJOR(dev->devt)) { |
ad6a1e1c6
|
947 948 |
error = device_create_file(dev, &devt_attr); if (error) |
a306eea40
|
949 |
goto ueventattrError; |
e105b8bfc
|
950 951 952 953 |
error = device_create_sys_dev_entry(dev); if (error) goto devtattrError; |
2b2af54a5
|
954 955 |
devtmpfs_create_node(dev); |
23681e479
|
956 |
} |
2ee97caf0
|
957 958 959 |
error = device_add_class_symlinks(dev); if (error) goto SymlinkError; |
dc0afa838
|
960 961 |
error = device_add_attrs(dev); if (error) |
2620efef7
|
962 |
goto AttrsError; |
dc0afa838
|
963 964 |
error = bus_add_device(dev); if (error) |
1da177e4c
|
965 |
goto BusError; |
3b98aeaf3
|
966 |
error = dpm_sysfs_add(dev); |
57eee3d23
|
967 |
if (error) |
3b98aeaf3
|
968 969 |
goto DPMError; device_pm_add(dev); |
ec0676ee2
|
970 971 972 973 974 975 976 |
/* Notify clients of device addition. This call must come * after dpm_sysf_add() and before kobject_uevent(). */ if (dev->bus) blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_ADD_DEVICE, dev); |
83b5fb4cc
|
977 |
kobject_uevent(&dev->kobj, KOBJ_ADD); |
2023c610d
|
978 |
bus_probe_device(dev); |
1da177e4c
|
979 |
if (parent) |
f791b8c83
|
980 981 |
klist_add_tail(&dev->p->knode_parent, &parent->p->klist_children); |
1da177e4c
|
982 |
|
5d9fd169c
|
983 |
if (dev->class) { |
f75b1c60f
|
984 |
mutex_lock(&dev->class->p->class_mutex); |
c47ed219b
|
985 |
/* tie the class to the device */ |
5a3ceb861
|
986 987 |
klist_add_tail(&dev->knode_class, &dev->class->p->class_devices); |
c47ed219b
|
988 989 |
/* notify any interfaces that the device is here */ |
184f1f779
|
990 991 |
list_for_each_entry(class_intf, &dev->class->p->class_interfaces, node) |
c47ed219b
|
992 993 |
if (class_intf->add_dev) class_intf->add_dev(dev, class_intf); |
f75b1c60f
|
994 |
mutex_unlock(&dev->class->p->class_mutex); |
5d9fd169c
|
995 |
} |
c906a48ad
|
996 |
done: |
1da177e4c
|
997 998 |
put_device(dev); return error; |
3b98aeaf3
|
999 |
DPMError: |
57eee3d23
|
1000 1001 |
bus_remove_device(dev); BusError: |
82f0cf9b7
|
1002 |
device_remove_attrs(dev); |
2620efef7
|
1003 |
AttrsError: |
2ee97caf0
|
1004 1005 |
device_remove_class_symlinks(dev); SymlinkError: |
ad6a1e1c6
|
1006 |
if (MAJOR(dev->devt)) |
ad72956df
|
1007 1008 |
devtmpfs_delete_node(dev); if (MAJOR(dev->devt)) |
e105b8bfc
|
1009 1010 1011 |
device_remove_sys_dev_entry(dev); devtattrError: if (MAJOR(dev->devt)) |
ad6a1e1c6
|
1012 |
device_remove_file(dev, &devt_attr); |
a306eea40
|
1013 |
ueventattrError: |
ad6a1e1c6
|
1014 |
device_remove_file(dev, &uevent_attr); |
23681e479
|
1015 |
attrError: |
312c004d3
|
1016 |
kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
1da177e4c
|
1017 1018 |
kobject_del(&dev->kobj); Error: |
63b6971a0
|
1019 |
cleanup_device_parent(dev); |
1da177e4c
|
1020 1021 |
if (parent) put_device(parent); |
5c8563d77
|
1022 1023 1024 |
name_error: kfree(dev->p); dev->p = NULL; |
c906a48ad
|
1025 |
goto done; |
1da177e4c
|
1026 |
} |
1da177e4c
|
1027 |
/** |
4a3ad20cc
|
1028 1029 |
* device_register - register a device with the system. * @dev: pointer to the device structure |
1da177e4c
|
1030 |
* |
4a3ad20cc
|
1031 1032 1033 1034 1035 1036 |
* This happens in two clean steps - initialize the device * and add it to the system. The two steps can be called * separately, but this is the easiest and most common. * I.e. you should only call the two helpers separately if * have a clearly defined need to use and refcount the device * before it is added to the hierarchy. |
5739411ac
|
1037 1038 1039 1040 |
* * NOTE: _Never_ directly free @dev after calling this function, even * if it returned an error! Always use put_device() to give up the * reference initialized in this function instead. |
1da177e4c
|
1041 |
*/ |
1da177e4c
|
1042 1043 1044 1045 1046 |
int device_register(struct device *dev) { device_initialize(dev); return device_add(dev); } |
1da177e4c
|
1047 |
/** |
4a3ad20cc
|
1048 1049 |
* get_device - increment reference count for device. * @dev: device. |
1da177e4c
|
1050 |
* |
4a3ad20cc
|
1051 1052 1053 |
* This simply forwards the call to kobject_get(), though * we do take care to provide for the case that we get a NULL * pointer passed in. |
1da177e4c
|
1054 |
*/ |
4a3ad20cc
|
1055 |
struct device *get_device(struct device *dev) |
1da177e4c
|
1056 1057 1058 |
{ return dev ? to_dev(kobject_get(&dev->kobj)) : NULL; } |
1da177e4c
|
1059 |
/** |
4a3ad20cc
|
1060 1061 |
* put_device - decrement reference count. * @dev: device in question. |
1da177e4c
|
1062 |
*/ |
4a3ad20cc
|
1063 |
void put_device(struct device *dev) |
1da177e4c
|
1064 |
{ |
edfaa7c36
|
1065 |
/* might_sleep(); */ |
1da177e4c
|
1066 1067 1068 |
if (dev) kobject_put(&dev->kobj); } |
1da177e4c
|
1069 |
/** |
4a3ad20cc
|
1070 1071 |
* device_del - delete device from system. * @dev: device. |
1da177e4c
|
1072 |
* |
4a3ad20cc
|
1073 1074 1075 1076 1077 |
* This is the first part of the device unregistration * sequence. This removes the device from the lists we control * from here, has it removed from the other driver model * subsystems it was added to in device_add(), and removes it * from the kobject hierarchy. |
1da177e4c
|
1078 |
* |
4a3ad20cc
|
1079 1080 |
* NOTE: this should be called manually _iff_ device_add() was * also called manually. |
1da177e4c
|
1081 |
*/ |
4a3ad20cc
|
1082 |
void device_del(struct device *dev) |
1da177e4c
|
1083 |
{ |
4a3ad20cc
|
1084 |
struct device *parent = dev->parent; |
c47ed219b
|
1085 |
struct class_interface *class_intf; |
1da177e4c
|
1086 |
|
ec0676ee2
|
1087 1088 1089 1090 1091 1092 |
/* Notify clients of device removal. This call must come * before dpm_sysfs_remove(). */ if (dev->bus) blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_DEL_DEVICE, dev); |
775b64d2b
|
1093 |
device_pm_remove(dev); |
3b98aeaf3
|
1094 |
dpm_sysfs_remove(dev); |
1da177e4c
|
1095 |
if (parent) |
f791b8c83
|
1096 |
klist_del(&dev->p->knode_parent); |
e105b8bfc
|
1097 |
if (MAJOR(dev->devt)) { |
2b2af54a5
|
1098 |
devtmpfs_delete_node(dev); |
e105b8bfc
|
1099 |
device_remove_sys_dev_entry(dev); |
ad6a1e1c6
|
1100 |
device_remove_file(dev, &devt_attr); |
e105b8bfc
|
1101 |
} |
b9d9c82b4
|
1102 |
if (dev->class) { |
da231fd5d
|
1103 |
device_remove_class_symlinks(dev); |
99ef3ef8d
|
1104 |
|
f75b1c60f
|
1105 |
mutex_lock(&dev->class->p->class_mutex); |
c47ed219b
|
1106 |
/* notify any interfaces that the device is now gone */ |
184f1f779
|
1107 1108 |
list_for_each_entry(class_intf, &dev->class->p->class_interfaces, node) |
c47ed219b
|
1109 1110 1111 |
if (class_intf->remove_dev) class_intf->remove_dev(dev, class_intf); /* remove the device from the class list */ |
5a3ceb861
|
1112 |
klist_del(&dev->knode_class); |
f75b1c60f
|
1113 |
mutex_unlock(&dev->class->p->class_mutex); |
b9d9c82b4
|
1114 |
} |
ad6a1e1c6
|
1115 |
device_remove_file(dev, &uevent_attr); |
2620efef7
|
1116 |
device_remove_attrs(dev); |
289535334
|
1117 |
bus_remove_device(dev); |
1da177e4c
|
1118 |
|
2f8d16a99
|
1119 1120 1121 1122 1123 1124 |
/* * Some platform devices are driven without driver attached * and managed resources may have been acquired. Make sure * all resources are released. */ devres_release_all(dev); |
1da177e4c
|
1125 1126 1127 1128 1129 |
/* Notify the platform of the removal, in case they * need to do anything... */ if (platform_notify_remove) platform_notify_remove(dev); |
312c004d3
|
1130 |
kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
da231fd5d
|
1131 |
cleanup_device_parent(dev); |
1da177e4c
|
1132 |
kobject_del(&dev->kobj); |
da231fd5d
|
1133 |
put_device(parent); |
1da177e4c
|
1134 1135 1136 |
} /** |
4a3ad20cc
|
1137 1138 |
* device_unregister - unregister device from system. * @dev: device going away. |
1da177e4c
|
1139 |
* |
4a3ad20cc
|
1140 1141 1142 1143 1144 1145 |
* We do this in two parts, like we do device_register(). First, * we remove it from all the subsystems with device_del(), then * we decrement the reference count via put_device(). If that * is the final reference count, the device will be cleaned up * via device_release() above. Otherwise, the structure will * stick around until the final reference to the device is dropped. |
1da177e4c
|
1146 |
*/ |
4a3ad20cc
|
1147 |
void device_unregister(struct device *dev) |
1da177e4c
|
1148 |
{ |
1e0b2cf93
|
1149 1150 |
pr_debug("device: '%s': %s ", dev_name(dev), __func__); |
1da177e4c
|
1151 1152 1153 |
device_del(dev); put_device(dev); } |
4a3ad20cc
|
1154 |
static struct device *next_device(struct klist_iter *i) |
36239577c
|
1155 |
{ |
4a3ad20cc
|
1156 |
struct klist_node *n = klist_next(i); |
f791b8c83
|
1157 1158 1159 1160 1161 1162 1163 1164 |
struct device *dev = NULL; struct device_private *p; if (n) { p = to_device_private_parent(n); dev = p->device; } return dev; |
36239577c
|
1165 |
} |
1da177e4c
|
1166 |
/** |
e454cea20
|
1167 |
* device_get_devnode - path of device node file |
6fcf53acc
|
1168 |
* @dev: device |
e454cea20
|
1169 |
* @mode: returned file access mode |
6fcf53acc
|
1170 1171 1172 1173 1174 1175 1176 |
* @tmp: possibly allocated string * * Return the relative path of a possible device node. * Non-default names may need to allocate a memory to compose * a name. This memory is returned in tmp and needs to be * freed by the caller. */ |
e454cea20
|
1177 1178 |
const char *device_get_devnode(struct device *dev, mode_t *mode, const char **tmp) |
6fcf53acc
|
1179 1180 1181 1182 1183 1184 |
{ char *s; *tmp = NULL; /* the device type may provide a specific name */ |
e454cea20
|
1185 1186 |
if (dev->type && dev->type->devnode) *tmp = dev->type->devnode(dev, mode); |
6fcf53acc
|
1187 1188 1189 1190 |
if (*tmp) return *tmp; /* the class may provide a specific name */ |
e454cea20
|
1191 1192 |
if (dev->class && dev->class->devnode) *tmp = dev->class->devnode(dev, mode); |
6fcf53acc
|
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 |
if (*tmp) return *tmp; /* return name without allocation, tmp == NULL */ if (strchr(dev_name(dev), '!') == NULL) return dev_name(dev); /* replace '!' in the name with '/' */ *tmp = kstrdup(dev_name(dev), GFP_KERNEL); if (!*tmp) return NULL; while ((s = strchr(*tmp, '!'))) s[0] = '/'; return *tmp; } /** |
4a3ad20cc
|
1210 1211 1212 1213 |
* device_for_each_child - device child iterator. * @parent: parent struct device. * @data: data for the callback. * @fn: function to be called for each device. |
1da177e4c
|
1214 |
* |
4a3ad20cc
|
1215 1216 |
* Iterate over @parent's child devices, and call @fn for each, * passing it @data. |
1da177e4c
|
1217 |
* |
4a3ad20cc
|
1218 1219 |
* We check the return of @fn each time. If it returns anything * other than 0, we break out and return that value. |
1da177e4c
|
1220 |
*/ |
4a3ad20cc
|
1221 1222 |
int device_for_each_child(struct device *parent, void *data, int (*fn)(struct device *dev, void *data)) |
1da177e4c
|
1223 |
{ |
36239577c
|
1224 |
struct klist_iter i; |
4a3ad20cc
|
1225 |
struct device *child; |
1da177e4c
|
1226 |
int error = 0; |
014c90dbb
|
1227 1228 |
if (!parent->p) return 0; |
f791b8c83
|
1229 |
klist_iter_init(&parent->p->klist_children, &i); |
36239577c
|
1230 1231 1232 |
while ((child = next_device(&i)) && !error) error = fn(child, data); klist_iter_exit(&i); |
1da177e4c
|
1233 1234 |
return error; } |
5ab699810
|
1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 |
/** * device_find_child - device iterator for locating a particular device. * @parent: parent struct device * @data: Data to pass to match function * @match: Callback function to check device * * This is similar to the device_for_each_child() function above, but it * returns a reference to a device that is 'found' for later use, as * determined by the @match callback. * * The callback should return 0 if the device doesn't match and non-zero * if it does. If the callback returns non-zero and a reference to the * current device can be obtained, this function will return to the caller * and not iterate over any more devices. */ |
4a3ad20cc
|
1250 1251 |
struct device *device_find_child(struct device *parent, void *data, int (*match)(struct device *dev, void *data)) |
5ab699810
|
1252 1253 1254 1255 1256 1257 |
{ struct klist_iter i; struct device *child; if (!parent) return NULL; |
f791b8c83
|
1258 |
klist_iter_init(&parent->p->klist_children, &i); |
5ab699810
|
1259 1260 1261 1262 1263 1264 |
while ((child = next_device(&i))) if (match(child, data) && get_device(child)) break; klist_iter_exit(&i); return child; } |
1da177e4c
|
1265 1266 |
int __init devices_init(void) { |
881c6cfd7
|
1267 1268 1269 |
devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); if (!devices_kset) return -ENOMEM; |
e105b8bfc
|
1270 1271 1272 1273 1274 1275 1276 1277 1278 |
dev_kobj = kobject_create_and_add("dev", NULL); if (!dev_kobj) goto dev_kobj_err; sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); if (!sysfs_dev_block_kobj) goto block_kobj_err; sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj); if (!sysfs_dev_char_kobj) goto char_kobj_err; |
881c6cfd7
|
1279 |
return 0; |
e105b8bfc
|
1280 1281 1282 1283 1284 1285 1286 1287 |
char_kobj_err: kobject_put(sysfs_dev_block_kobj); block_kobj_err: kobject_put(dev_kobj); dev_kobj_err: kset_unregister(devices_kset); return -ENOMEM; |
1da177e4c
|
1288 1289 1290 |
} EXPORT_SYMBOL_GPL(device_for_each_child); |
5ab699810
|
1291 |
EXPORT_SYMBOL_GPL(device_find_child); |
1da177e4c
|
1292 1293 1294 1295 1296 1297 1298 1299 1300 |
EXPORT_SYMBOL_GPL(device_initialize); EXPORT_SYMBOL_GPL(device_add); EXPORT_SYMBOL_GPL(device_register); EXPORT_SYMBOL_GPL(device_del); EXPORT_SYMBOL_GPL(device_unregister); EXPORT_SYMBOL_GPL(get_device); EXPORT_SYMBOL_GPL(put_device); |
1da177e4c
|
1301 1302 1303 |
EXPORT_SYMBOL_GPL(device_create_file); EXPORT_SYMBOL_GPL(device_remove_file); |
23681e479
|
1304 |
|
0aa0dc41b
|
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 |
struct root_device { struct device dev; struct module *owner; }; #define to_root_device(dev) container_of(dev, struct root_device, dev) static void root_device_release(struct device *dev) { kfree(to_root_device(dev)); } /** * __root_device_register - allocate and register a root device * @name: root device name * @owner: owner module of the root device, usually THIS_MODULE * * This function allocates a root device and registers it * using device_register(). In order to free the returned * device, use root_device_unregister(). * * Root devices are dummy devices which allow other devices * to be grouped under /sys/devices. Use this function to * allocate a root device and then use it as the parent of * any device which should appear under /sys/devices/{name} * * The /sys/devices/{name} directory will also contain a * 'module' symlink which points to the @owner directory * in sysfs. * |
f0eae0ed3
|
1336 1337 |
* Returns &struct device pointer on success, or ERR_PTR() on error. * |
0aa0dc41b
|
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 |
* Note: You probably want to use root_device_register(). */ struct device *__root_device_register(const char *name, struct module *owner) { struct root_device *root; int err = -ENOMEM; root = kzalloc(sizeof(struct root_device), GFP_KERNEL); if (!root) return ERR_PTR(err); |
acc0e90fb
|
1348 |
err = dev_set_name(&root->dev, "%s", name); |
0aa0dc41b
|
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 |
if (err) { kfree(root); return ERR_PTR(err); } root->dev.release = root_device_release; err = device_register(&root->dev); if (err) { put_device(&root->dev); return ERR_PTR(err); } |
1d9e882ba
|
1361 |
#ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
0aa0dc41b
|
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 |
if (owner) { struct module_kobject *mk = &owner->mkobj; err = sysfs_create_link(&root->dev.kobj, &mk->kobj, "module"); if (err) { device_unregister(&root->dev); return ERR_PTR(err); } root->owner = owner; } #endif return &root->dev; } EXPORT_SYMBOL_GPL(__root_device_register); /** * root_device_unregister - unregister and free a root device |
7cbcf2254
|
1380 |
* @dev: device going away |
0aa0dc41b
|
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 |
* * This function unregisters and cleans up a device that was created by * root_device_register(). */ void root_device_unregister(struct device *dev) { struct root_device *root = to_root_device(dev); if (root->owner) sysfs_remove_link(&root->dev.kobj, "module"); device_unregister(dev); } EXPORT_SYMBOL_GPL(root_device_unregister); |
23681e479
|
1395 1396 1397 |
static void device_create_release(struct device *dev) { |
1e0b2cf93
|
1398 1399 |
pr_debug("device: '%s': %s ", dev_name(dev), __func__); |
23681e479
|
1400 1401 1402 1403 |
kfree(dev); } /** |
8882b3942
|
1404 |
* device_create_vargs - creates a device and registers it with sysfs |
42734dafa
|
1405 1406 1407 |
* @class: pointer to the struct class that this device should be registered to * @parent: pointer to the parent struct device of this new device, if any * @devt: the dev_t for the char device to be added |
8882b3942
|
1408 |
* @drvdata: the data to be added to the device for callbacks |
42734dafa
|
1409 |
* @fmt: string for the device's name |
8882b3942
|
1410 |
* @args: va_list for the device's name |
42734dafa
|
1411 1412 1413 |
* * This function can be used by char device classes. A struct device * will be created in sysfs, registered to the specified class. |
23681e479
|
1414 |
* |
23681e479
|
1415 1416 |
* A "dev" file will be created, showing the dev_t for the device, if * the dev_t is not 0,0. |
42734dafa
|
1417 1418 1419 1420 |
* If a pointer to a parent struct device is passed in, the newly created * struct device will be a child of that device in sysfs. * The pointer to the struct device will be returned from the call. * Any further sysfs files that might be required can be created using this |
23681e479
|
1421 1422 |
* pointer. * |
f0eae0ed3
|
1423 1424 |
* Returns &struct device pointer on success, or ERR_PTR() on error. * |
23681e479
|
1425 1426 1427 |
* Note: the struct class passed to this function must have previously * been created with a call to class_create(). */ |
8882b3942
|
1428 1429 1430 |
struct device *device_create_vargs(struct class *class, struct device *parent, dev_t devt, void *drvdata, const char *fmt, va_list args) |
23681e479
|
1431 |
{ |
23681e479
|
1432 1433 1434 1435 1436 |
struct device *dev = NULL; int retval = -ENODEV; if (class == NULL || IS_ERR(class)) goto error; |
23681e479
|
1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 |
dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) { retval = -ENOMEM; goto error; } dev->devt = devt; dev->class = class; dev->parent = parent; dev->release = device_create_release; |
8882b3942
|
1448 |
dev_set_drvdata(dev, drvdata); |
23681e479
|
1449 |
|
1fa5ae857
|
1450 1451 1452 |
retval = kobject_set_name_vargs(&dev->kobj, fmt, args); if (retval) goto error; |
23681e479
|
1453 1454 1455 |
retval = device_register(dev); if (retval) goto error; |
23681e479
|
1456 1457 1458 |
return dev; error: |
286661b37
|
1459 |
put_device(dev); |
23681e479
|
1460 1461 |
return ERR_PTR(retval); } |
8882b3942
|
1462 1463 1464 |
EXPORT_SYMBOL_GPL(device_create_vargs); /** |
4e1067394
|
1465 |
* device_create - creates a device and registers it with sysfs |
8882b3942
|
1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 |
* @class: pointer to the struct class that this device should be registered to * @parent: pointer to the parent struct device of this new device, if any * @devt: the dev_t for the char device to be added * @drvdata: the data to be added to the device for callbacks * @fmt: string for the device's name * * This function can be used by char device classes. A struct device * will be created in sysfs, registered to the specified class. * * A "dev" file will be created, showing the dev_t for the device, if * the dev_t is not 0,0. * If a pointer to a parent struct device is passed in, the newly created * struct device will be a child of that device in sysfs. * The pointer to the struct device will be returned from the call. * Any further sysfs files that might be required can be created using this * pointer. * |
f0eae0ed3
|
1483 1484 |
* Returns &struct device pointer on success, or ERR_PTR() on error. * |
8882b3942
|
1485 1486 1487 |
* Note: the struct class passed to this function must have previously * been created with a call to class_create(). */ |
4e1067394
|
1488 1489 |
struct device *device_create(struct class *class, struct device *parent, dev_t devt, void *drvdata, const char *fmt, ...) |
8882b3942
|
1490 1491 1492 1493 1494 1495 1496 1497 1498 |
{ va_list vargs; struct device *dev; va_start(vargs, fmt); dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs); va_end(vargs); return dev; } |
4e1067394
|
1499 |
EXPORT_SYMBOL_GPL(device_create); |
8882b3942
|
1500 |
|
cd35449b9
|
1501 |
static int __match_devt(struct device *dev, void *data) |
23681e479
|
1502 |
{ |
cd35449b9
|
1503 |
dev_t *devt = data; |
23681e479
|
1504 |
|
cd35449b9
|
1505 |
return dev->devt == *devt; |
775b64d2b
|
1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 |
} /** * device_destroy - removes a device that was created with device_create() * @class: pointer to the struct class that this device was registered with * @devt: the dev_t of the device that was previously registered * * This call unregisters and cleans up a device that was created with a * call to device_create(). */ void device_destroy(struct class *class, dev_t devt) { struct device *dev; |
23681e479
|
1519 |
|
695794ae0
|
1520 |
dev = class_find_device(class, NULL, &devt, __match_devt); |
cd35449b9
|
1521 1522 |
if (dev) { put_device(dev); |
23681e479
|
1523 |
device_unregister(dev); |
cd35449b9
|
1524 |
} |
23681e479
|
1525 1526 |
} EXPORT_SYMBOL_GPL(device_destroy); |
a2de48cac
|
1527 1528 1529 1530 1531 |
/** * device_rename - renames a device * @dev: the pointer to the struct device to be renamed * @new_name: the new name of the device |
030c1d2bf
|
1532 1533 1534 1535 1536 |
* * It is the responsibility of the caller to provide mutual * exclusion between two different calls of device_rename * on the same device to ensure that new_name is valid and * won't conflict with other devices. |
a2de48cac
|
1537 1538 1539 1540 1541 |
*/ int device_rename(struct device *dev, char *new_name) { char *old_class_name = NULL; char *new_class_name = NULL; |
2ee97caf0
|
1542 |
char *old_device_name = NULL; |
a2de48cac
|
1543 1544 1545 1546 1547 |
int error; dev = get_device(dev); if (!dev) return -EINVAL; |
1e0b2cf93
|
1548 1549 |
pr_debug("device: '%s': %s: renaming to '%s' ", dev_name(dev), |
2b3a302a0
|
1550 |
__func__, new_name); |
a2de48cac
|
1551 |
|
99ef3ef8d
|
1552 |
#ifdef CONFIG_SYSFS_DEPRECATED |
a2de48cac
|
1553 1554 |
if ((dev->class) && (dev->parent)) old_class_name = make_class_name(dev->class->name, &dev->kobj); |
99ef3ef8d
|
1555 |
#endif |
a2de48cac
|
1556 |
|
1fa5ae857
|
1557 |
old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
2ee97caf0
|
1558 1559 1560 |
if (!old_device_name) { error = -ENOMEM; goto out; |
a2de48cac
|
1561 |
} |
a2de48cac
|
1562 |
|
f349cf347
|
1563 1564 1565 1566 1567 1568 1569 1570 |
#ifndef CONFIG_SYSFS_DEPRECATED if (dev->class) { error = sysfs_rename_link(&dev->class->p->class_subsys.kobj, &dev->kobj, old_device_name, new_name); if (error) goto out; } #endif |
a2de48cac
|
1571 |
error = kobject_rename(&dev->kobj, new_name); |
1fa5ae857
|
1572 |
if (error) |
2ee97caf0
|
1573 |
goto out; |
a2de48cac
|
1574 |
|
99ef3ef8d
|
1575 |
#ifdef CONFIG_SYSFS_DEPRECATED |
a2de48cac
|
1576 1577 1578 |
if (old_class_name) { new_class_name = make_class_name(dev->class->name, &dev->kobj); if (new_class_name) { |
2354dcc72
|
1579 1580 1581 1582 |
error = sysfs_rename_link(&dev->parent->kobj, &dev->kobj, old_class_name, new_class_name); |
a2de48cac
|
1583 1584 |
} } |
60b8cabd8
|
1585 |
#endif |
2ee97caf0
|
1586 |
out: |
a2de48cac
|
1587 |
put_device(dev); |
a2de48cac
|
1588 |
kfree(new_class_name); |
952ab431c
|
1589 |
kfree(old_class_name); |
2ee97caf0
|
1590 |
kfree(old_device_name); |
a2de48cac
|
1591 1592 1593 |
return error; } |
a2807dbcb
|
1594 |
EXPORT_SYMBOL_GPL(device_rename); |
8a82472f8
|
1595 1596 1597 1598 1599 |
static int device_move_class_links(struct device *dev, struct device *old_parent, struct device *new_parent) { |
f7f3461d8
|
1600 |
int error = 0; |
8a82472f8
|
1601 |
#ifdef CONFIG_SYSFS_DEPRECATED |
8a82472f8
|
1602 1603 1604 1605 |
char *class_name; class_name = make_class_name(dev->class->name, &dev->kobj); if (!class_name) { |
cb360bbf6
|
1606 |
error = -ENOMEM; |
8a82472f8
|
1607 1608 1609 1610 1611 1612 |
goto out; } if (old_parent) { sysfs_remove_link(&dev->kobj, "device"); sysfs_remove_link(&old_parent->kobj, class_name); } |
c744aeae9
|
1613 1614 1615 1616 1617 1618 1619 1620 1621 |
if (new_parent) { error = sysfs_create_link(&dev->kobj, &new_parent->kobj, "device"); if (error) goto out; error = sysfs_create_link(&new_parent->kobj, &dev->kobj, class_name); if (error) sysfs_remove_link(&dev->kobj, "device"); |
4a3ad20cc
|
1622 |
} else |
c744aeae9
|
1623 |
error = 0; |
8a82472f8
|
1624 1625 1626 1627 |
out: kfree(class_name); return error; #else |
f7f3461d8
|
1628 1629 1630 1631 1632 1633 |
if (old_parent) sysfs_remove_link(&dev->kobj, "device"); if (new_parent) error = sysfs_create_link(&dev->kobj, &new_parent->kobj, "device"); return error; |
8a82472f8
|
1634 1635 1636 1637 1638 1639 |
#endif } /** * device_move - moves a device to a new parent * @dev: the pointer to the struct device to be moved |
c744aeae9
|
1640 |
* @new_parent: the new parent of the device (can by NULL) |
ffa6a7054
|
1641 |
* @dpm_order: how to reorder the dpm_list |
8a82472f8
|
1642 |
*/ |
ffa6a7054
|
1643 1644 |
int device_move(struct device *dev, struct device *new_parent, enum dpm_order dpm_order) |
8a82472f8
|
1645 1646 1647 |
{ int error; struct device *old_parent; |
c744aeae9
|
1648 |
struct kobject *new_parent_kobj; |
8a82472f8
|
1649 1650 1651 1652 |
dev = get_device(dev); if (!dev) return -EINVAL; |
ffa6a7054
|
1653 |
device_pm_lock(); |
8a82472f8
|
1654 |
new_parent = get_device(new_parent); |
4a3ad20cc
|
1655 |
new_parent_kobj = get_device_parent(dev, new_parent); |
63b6971a0
|
1656 |
|
1e0b2cf93
|
1657 1658 1659 |
pr_debug("device: '%s': %s: moving to '%s' ", dev_name(dev), __func__, new_parent ? dev_name(new_parent) : "<NULL>"); |
c744aeae9
|
1660 |
error = kobject_move(&dev->kobj, new_parent_kobj); |
8a82472f8
|
1661 |
if (error) { |
63b6971a0
|
1662 |
cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f8
|
1663 1664 1665 1666 1667 1668 |
put_device(new_parent); goto out; } old_parent = dev->parent; dev->parent = new_parent; if (old_parent) |
f791b8c83
|
1669 |
klist_remove(&dev->p->knode_parent); |
0d358f22f
|
1670 |
if (new_parent) { |
f791b8c83
|
1671 1672 |
klist_add_tail(&dev->p->knode_parent, &new_parent->p->klist_children); |
0d358f22f
|
1673 1674 |
set_dev_node(dev, dev_to_node(new_parent)); } |
8a82472f8
|
1675 1676 1677 1678 1679 1680 1681 |
if (!dev->class) goto out_put; error = device_move_class_links(dev, old_parent, new_parent); if (error) { /* We ignore errors on cleanup since we're hosed anyway... */ device_move_class_links(dev, new_parent, old_parent); if (!kobject_move(&dev->kobj, &old_parent->kobj)) { |
c744aeae9
|
1682 |
if (new_parent) |
f791b8c83
|
1683 |
klist_remove(&dev->p->knode_parent); |
0d358f22f
|
1684 1685 |
dev->parent = old_parent; if (old_parent) { |
f791b8c83
|
1686 1687 |
klist_add_tail(&dev->p->knode_parent, &old_parent->p->klist_children); |
0d358f22f
|
1688 1689 |
set_dev_node(dev, dev_to_node(old_parent)); } |
8a82472f8
|
1690 |
} |
63b6971a0
|
1691 |
cleanup_glue_dir(dev, new_parent_kobj); |
8a82472f8
|
1692 1693 1694 |
put_device(new_parent); goto out; } |
ffa6a7054
|
1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 |
switch (dpm_order) { case DPM_ORDER_NONE: break; case DPM_ORDER_DEV_AFTER_PARENT: device_pm_move_after(dev, new_parent); break; case DPM_ORDER_PARENT_BEFORE_DEV: device_pm_move_before(new_parent, dev); break; case DPM_ORDER_DEV_LAST: device_pm_move_last(dev); break; } |
8a82472f8
|
1708 1709 1710 |
out_put: put_device(old_parent); out: |
ffa6a7054
|
1711 |
device_pm_unlock(); |
8a82472f8
|
1712 1713 1714 |
put_device(dev); return error; } |
8a82472f8
|
1715 |
EXPORT_SYMBOL_GPL(device_move); |
37b0c0203
|
1716 1717 1718 1719 1720 1721 |
/** * device_shutdown - call ->shutdown() on each device to shutdown. */ void device_shutdown(void) { |
6245838fe
|
1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 |
struct device *dev; spin_lock(&devices_kset->list_lock); /* * Walk the devices list backward, shutting down each in turn. * Beware that device unplug events may also start pulling * devices offline, even as the system is shutting down. */ while (!list_empty(&devices_kset->list)) { dev = list_entry(devices_kset->list.prev, struct device, kobj.entry); get_device(dev); /* * Make sure the device is off the kset list, in the * event that dev->*->shutdown() doesn't remove it. */ list_del_init(&dev->kobj.entry); spin_unlock(&devices_kset->list_lock); |
37b0c0203
|
1740 |
|
37b0c0203
|
1741 1742 1743 1744 1745 1746 1747 1748 1749 |
if (dev->bus && dev->bus->shutdown) { dev_dbg(dev, "shutdown "); dev->bus->shutdown(dev); } else if (dev->driver && dev->driver->shutdown) { dev_dbg(dev, "shutdown "); dev->driver->shutdown(dev); } |
6245838fe
|
1750 1751 1752 |
put_device(dev); spin_lock(&devices_kset->list_lock); |
37b0c0203
|
1753 |
} |
6245838fe
|
1754 |
spin_unlock(&devices_kset->list_lock); |
401097ea4
|
1755 |
async_synchronize_full(); |
37b0c0203
|
1756 |
} |
99bcf2171
|
1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 |
/* * Device logging functions */ #ifdef CONFIG_PRINTK static int __dev_printk(const char *level, const struct device *dev, struct va_format *vaf) { if (!dev) return printk("%s(NULL device *): %pV", level, vaf); return printk("%s%s %s: %pV", level, dev_driver_string(dev), dev_name(dev), vaf); } int dev_printk(const char *level, const struct device *dev, const char *fmt, ...) { struct va_format vaf; va_list args; int r; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; r = __dev_printk(level, dev, &vaf); va_end(args); return r; } EXPORT_SYMBOL(dev_printk); #define define_dev_printk_level(func, kern_level) \ int func(const struct device *dev, const char *fmt, ...) \ { \ struct va_format vaf; \ va_list args; \ int r; \ \ va_start(args, fmt); \ \ vaf.fmt = fmt; \ vaf.va = &args; \ \ r = __dev_printk(kern_level, dev, &vaf); \ va_end(args); \ \ return r; \ } \ EXPORT_SYMBOL(func); define_dev_printk_level(dev_emerg, KERN_EMERG); define_dev_printk_level(dev_alert, KERN_ALERT); define_dev_printk_level(dev_crit, KERN_CRIT); define_dev_printk_level(dev_err, KERN_ERR); define_dev_printk_level(dev_warn, KERN_WARNING); define_dev_printk_level(dev_notice, KERN_NOTICE); define_dev_printk_level(_dev_info, KERN_INFO); #endif |