| /* |
| * 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 |
| * Copyright (c) 2006 Greg Kroah-Hartman <gregkh@suse.de> |
| * Copyright (c) 2006 Novell, Inc. |
| * |
| * This file is released under the GPLv2 |
| * |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/kdev_t.h> |
| #include <linux/notifier.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/genhd.h> |
| #include <linux/kallsyms.h> |
| #include <linux/mutex.h> |
| #include <linux/async.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/netdevice.h> |
| #include <linux/sysfs.h> |
| |
| #include "base.h" |
| #include "power/power.h" |
| |
| #ifdef CONFIG_SYSFS_DEPRECATED |
| #ifdef CONFIG_SYSFS_DEPRECATED_V2 |
| long sysfs_deprecated = 1; |
| #else |
| long sysfs_deprecated = 0; |
| #endif |
| static int __init sysfs_deprecated_setup(char *arg) |
| { |
| return kstrtol(arg, 10, &sysfs_deprecated); |
| } |
| early_param("sysfs.deprecated", sysfs_deprecated_setup); |
| #endif |
| |
| int (*platform_notify)(struct device *dev) = NULL; |
| int (*platform_notify_remove)(struct device *dev) = NULL; |
| static struct kobject *dev_kobj; |
| struct kobject *sysfs_dev_char_kobj; |
| struct kobject *sysfs_dev_block_kobj; |
| |
| static DEFINE_MUTEX(device_hotplug_lock); |
| |
| void lock_device_hotplug(void) |
| { |
| mutex_lock(&device_hotplug_lock); |
| } |
| |
| void unlock_device_hotplug(void) |
| { |
| mutex_unlock(&device_hotplug_lock); |
| } |
| |
| int lock_device_hotplug_sysfs(void) |
| { |
| if (mutex_trylock(&device_hotplug_lock)) |
| return 0; |
| |
| /* Avoid busy looping (5 ms of sleep should do). */ |
| msleep(5); |
| return restart_syscall(); |
| } |
| |
| #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 |
| |
| /** |
| * 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 driver, 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. |
| */ |
| const char *dev_driver_string(const struct device *dev) |
| { |
| 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 : |
| (dev->bus ? dev->bus->name : |
| (dev->class ? dev->class->name : "")); |
| } |
| EXPORT_SYMBOL(dev_driver_string); |
| |
| #define to_dev_attr(_attr) container_of(_attr, struct device_attribute, attr) |
| |
| static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, |
| char *buf) |
| { |
| struct device_attribute *dev_attr = to_dev_attr(attr); |
| struct device *dev = kobj_to_dev(kobj); |
| ssize_t ret = -EIO; |
| |
| if (dev_attr->show) |
| ret = dev_attr->show(dev, dev_attr, buf); |
| if (ret >= (ssize_t)PAGE_SIZE) { |
| print_symbol("dev_attr_show: %s returned bad count\n", |
| (unsigned long)dev_attr->show); |
| } |
| return ret; |
| } |
| |
| static ssize_t dev_attr_store(struct kobject *kobj, struct attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct device_attribute *dev_attr = to_dev_attr(attr); |
| struct device *dev = kobj_to_dev(kobj); |
| ssize_t ret = -EIO; |
| |
| if (dev_attr->store) |
| ret = dev_attr->store(dev, dev_attr, buf, count); |
| return ret; |
| } |
| |
| static const struct sysfs_ops dev_sysfs_ops = { |
| .show = dev_attr_show, |
| .store = dev_attr_store, |
| }; |
| |
| #define to_ext_attr(x) container_of(x, struct dev_ext_attribute, attr) |
| |
| ssize_t device_store_ulong(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct dev_ext_attribute *ea = to_ext_attr(attr); |
| char *end; |
| unsigned long new = simple_strtoul(buf, &end, 0); |
| if (end == buf) |
| return -EINVAL; |
| *(unsigned long *)(ea->var) = new; |
| /* Always return full write size even if we didn't consume all */ |
| return size; |
| } |
| EXPORT_SYMBOL_GPL(device_store_ulong); |
| |
| ssize_t device_show_ulong(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct dev_ext_attribute *ea = to_ext_attr(attr); |
| return snprintf(buf, PAGE_SIZE, "%lx\n", *(unsigned long *)(ea->var)); |
| } |
| EXPORT_SYMBOL_GPL(device_show_ulong); |
| |
| ssize_t device_store_int(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct dev_ext_attribute *ea = to_ext_attr(attr); |
| char *end; |
| long new = simple_strtol(buf, &end, 0); |
| if (end == buf || new > INT_MAX || new < INT_MIN) |
| return -EINVAL; |
| *(int *)(ea->var) = new; |
| /* Always return full write size even if we didn't consume all */ |
| return size; |
| } |
| EXPORT_SYMBOL_GPL(device_store_int); |
| |
| ssize_t device_show_int(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct dev_ext_attribute *ea = to_ext_attr(attr); |
| |
| return snprintf(buf, PAGE_SIZE, "%d\n", *(int *)(ea->var)); |
| } |
| EXPORT_SYMBOL_GPL(device_show_int); |
| |
| ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| struct dev_ext_attribute *ea = to_ext_attr(attr); |
| |
| if (strtobool(buf, ea->var) < 0) |
| return -EINVAL; |
| |
| return size; |
| } |
| EXPORT_SYMBOL_GPL(device_store_bool); |
| |
| ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct dev_ext_attribute *ea = to_ext_attr(attr); |
| |
| return snprintf(buf, PAGE_SIZE, "%d\n", *(bool *)(ea->var)); |
| } |
| EXPORT_SYMBOL_GPL(device_show_bool); |
| |
| /** |
| * 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. |
| */ |
| static void device_release(struct kobject *kobj) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct device_private *p = dev->p; |
| |
| /* |
| * Some platform devices are driven without driver attached |
| * and managed resources may have been acquired. Make sure |
| * all resources are released. |
| * |
| * Drivers still can add resources into device after device |
| * is deleted but alive, so release devres here to avoid |
| * possible memory leak. |
| */ |
| devres_release_all(dev); |
| |
| if (dev->release) |
| dev->release(dev); |
| else if (dev->type && dev->type->release) |
| dev->type->release(dev); |
| else if (dev->class && dev->class->dev_release) |
| dev->class->dev_release(dev); |
| else |
| WARN(1, KERN_ERR "Device '%s' does not have a release() " |
| "function, it is broken and must be fixed.\n", |
| dev_name(dev)); |
| kfree(p); |
| } |
| |
| static const void *device_namespace(struct kobject *kobj) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| const void *ns = NULL; |
| |
| if (dev->class && dev->class->ns_type) |
| ns = dev->class->namespace(dev); |
| |
| return ns; |
| } |
| |
| static struct kobj_type device_ktype = { |
| .release = device_release, |
| .sysfs_ops = &dev_sysfs_ops, |
| .namespace = device_namespace, |
| }; |
| |
| |
| static int dev_uevent_filter(struct kset *kset, struct kobject *kobj) |
| { |
| struct kobj_type *ktype = get_ktype(kobj); |
| |
| if (ktype == &device_ktype) { |
| struct device *dev = kobj_to_dev(kobj); |
| if (dev->bus) |
| return 1; |
| if (dev->class) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static const char *dev_uevent_name(struct kset *kset, struct kobject *kobj) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| |
| if (dev->bus) |
| return dev->bus->name; |
| if (dev->class) |
| return dev->class->name; |
| return NULL; |
| } |
| |
| static int dev_uevent(struct kset *kset, struct kobject *kobj, |
| struct kobj_uevent_env *env) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| int retval = 0; |
| |
| /* add device node properties if present */ |
| if (MAJOR(dev->devt)) { |
| const char *tmp; |
| const char *name; |
| umode_t mode = 0; |
| kuid_t uid = GLOBAL_ROOT_UID; |
| kgid_t gid = GLOBAL_ROOT_GID; |
| |
| add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); |
| add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); |
| name = device_get_devnode(dev, &mode, &uid, &gid, &tmp); |
| if (name) { |
| add_uevent_var(env, "DEVNAME=%s", name); |
| if (mode) |
| add_uevent_var(env, "DEVMODE=%#o", mode & 0777); |
| if (!uid_eq(uid, GLOBAL_ROOT_UID)) |
| add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid)); |
| if (!gid_eq(gid, GLOBAL_ROOT_GID)) |
| add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid)); |
| kfree(tmp); |
| } |
| } |
| |
| if (dev->type && dev->type->name) |
| add_uevent_var(env, "DEVTYPE=%s", dev->type->name); |
| |
| if (dev->driver) |
| add_uevent_var(env, "DRIVER=%s", dev->driver->name); |
| |
| /* Add common DT information about the device */ |
| of_device_uevent(dev, env); |
| |
| /* have the bus specific function add its stuff */ |
| if (dev->bus && dev->bus->uevent) { |
| retval = dev->bus->uevent(dev, env); |
| if (retval) |
| pr_debug("device: '%s': %s: bus uevent() returned %d\n", |
| dev_name(dev), __func__, retval); |
| } |
| |
| /* have the class specific function add its stuff */ |
| if (dev->class && dev->class->dev_uevent) { |
| retval = dev->class->dev_uevent(dev, env); |
| if (retval) |
| pr_debug("device: '%s': %s: class uevent() " |
| "returned %d\n", dev_name(dev), |
| __func__, retval); |
| } |
| |
| /* have the device type specific function add its stuff */ |
| if (dev->type && dev->type->uevent) { |
| retval = dev->type->uevent(dev, env); |
| if (retval) |
| pr_debug("device: '%s': %s: dev_type uevent() " |
| "returned %d\n", dev_name(dev), |
| __func__, retval); |
| } |
| |
| return retval; |
| } |
| |
| static const struct kset_uevent_ops device_uevent_ops = { |
| .filter = dev_uevent_filter, |
| .name = dev_uevent_name, |
| .uevent = dev_uevent, |
| }; |
| |
| static ssize_t uevent_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct kobject *top_kobj; |
| struct kset *kset; |
| struct kobj_uevent_env *env = NULL; |
| int i; |
| size_t count = 0; |
| int retval; |
| |
| /* search the kset, the device belongs to */ |
| top_kobj = &dev->kobj; |
| while (!top_kobj->kset && top_kobj->parent) |
| top_kobj = top_kobj->parent; |
| if (!top_kobj->kset) |
| goto out; |
| |
| 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; |
| |
| env = kzalloc(sizeof(struct kobj_uevent_env), GFP_KERNEL); |
| if (!env) |
| return -ENOMEM; |
| |
| /* let the kset specific function add its keys */ |
| retval = kset->uevent_ops->uevent(kset, &dev->kobj, env); |
| if (retval) |
| goto out; |
| |
| /* copy keys to file */ |
| for (i = 0; i < env->envp_idx; i++) |
| count += sprintf(&buf[count], "%s\n", env->envp[i]); |
| out: |
| kfree(env); |
| return count; |
| } |
| |
| static ssize_t uevent_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| enum kobject_action action; |
| |
| if (kobject_action_type(buf, count, &action) == 0) |
| kobject_uevent(&dev->kobj, action); |
| else |
| dev_err(dev, "uevent: unknown action-string\n"); |
| return count; |
| } |
| static DEVICE_ATTR_RW(uevent); |
| |
| static ssize_t online_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| bool val; |
| |
| device_lock(dev); |
| val = !dev->offline; |
| device_unlock(dev); |
| return sprintf(buf, "%u\n", val); |
| } |
| |
| static ssize_t online_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| bool val; |
| int ret; |
| |
| ret = strtobool(buf, &val); |
| if (ret < 0) |
| return ret; |
| |
| ret = lock_device_hotplug_sysfs(); |
| if (ret) |
| return ret; |
| |
| ret = val ? device_online(dev) : device_offline(dev); |
| unlock_device_hotplug(); |
| return ret < 0 ? ret : count; |
| } |
| static DEVICE_ATTR_RW(online); |
| |
| int device_add_groups(struct device *dev, const struct attribute_group **groups) |
| { |
| return sysfs_create_groups(&dev->kobj, groups); |
| } |
| |
| void device_remove_groups(struct device *dev, |
| const struct attribute_group **groups) |
| { |
| sysfs_remove_groups(&dev->kobj, groups); |
| } |
| |
| static int device_add_attrs(struct device *dev) |
| { |
| struct class *class = dev->class; |
| const struct device_type *type = dev->type; |
| int error; |
| |
| if (class) { |
| error = device_add_groups(dev, class->dev_groups); |
| if (error) |
| return error; |
| } |
| |
| if (type) { |
| error = device_add_groups(dev, type->groups); |
| if (error) |
| goto err_remove_class_groups; |
| } |
| |
| error = device_add_groups(dev, dev->groups); |
| if (error) |
| goto err_remove_type_groups; |
| |
| if (device_supports_offline(dev) && !dev->offline_disabled) { |
| error = device_create_file(dev, &dev_attr_online); |
| if (error) |
| goto err_remove_dev_groups; |
| } |
| |
| return 0; |
| |
| err_remove_dev_groups: |
| device_remove_groups(dev, dev->groups); |
| err_remove_type_groups: |
| if (type) |
| device_remove_groups(dev, type->groups); |
| err_remove_class_groups: |
| if (class) |
| device_remove_groups(dev, class->dev_groups); |
| |
| return error; |
| } |
| |
| static void device_remove_attrs(struct device *dev) |
| { |
| struct class *class = dev->class; |
| const struct device_type *type = dev->type; |
| |
| device_remove_file(dev, &dev_attr_online); |
| device_remove_groups(dev, dev->groups); |
| |
| if (type) |
| device_remove_groups(dev, type->groups); |
| |
| if (class) |
| device_remove_groups(dev, class->dev_groups); |
| } |
| |
| static ssize_t dev_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| return print_dev_t(buf, dev->devt); |
| } |
| static DEVICE_ATTR_RO(dev); |
| |
| /* /sys/devices/ */ |
| struct kset *devices_kset; |
| |
| /** |
| * device_create_file - create sysfs attribute file for device. |
| * @dev: device. |
| * @attr: device attribute descriptor. |
| */ |
| int device_create_file(struct device *dev, |
| const struct device_attribute *attr) |
| { |
| int error = 0; |
| |
| if (dev) { |
| WARN(((attr->attr.mode & S_IWUGO) && !attr->store), |
| "Attribute %s: write permission without 'store'\n", |
| attr->attr.name); |
| WARN(((attr->attr.mode & S_IRUGO) && !attr->show), |
| "Attribute %s: read permission without 'show'\n", |
| attr->attr.name); |
| error = sysfs_create_file(&dev->kobj, &attr->attr); |
| } |
| |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(device_create_file); |
| |
| /** |
| * device_remove_file - remove sysfs attribute file. |
| * @dev: device. |
| * @attr: device attribute descriptor. |
| */ |
| void device_remove_file(struct device *dev, |
| const struct device_attribute *attr) |
| { |
| if (dev) |
| sysfs_remove_file(&dev->kobj, &attr->attr); |
| } |
| EXPORT_SYMBOL_GPL(device_remove_file); |
| |
| /** |
| * device_create_bin_file - create sysfs binary attribute file for device. |
| * @dev: device. |
| * @attr: device binary attribute descriptor. |
| */ |
| int device_create_bin_file(struct device *dev, |
| const struct bin_attribute *attr) |
| { |
| 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. |
| */ |
| void device_remove_bin_file(struct device *dev, |
| const struct bin_attribute *attr) |
| { |
| if (dev) |
| sysfs_remove_bin_file(&dev->kobj, attr); |
| } |
| EXPORT_SYMBOL_GPL(device_remove_bin_file); |
| |
| /** |
| * device_schedule_callback_owner - helper to schedule a callback for a device |
| * @dev: device. |
| * @func: callback function to invoke later. |
| * @owner: module owning the callback routine |
| * |
| * 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. |
| * |
| * This routine is usually called via the inline device_schedule_callback(), |
| * which automatically sets @owner to THIS_MODULE. |
| * |
| * Returns 0 if the request was submitted, -ENOMEM if storage could not |
| * be allocated, -ENODEV if a reference to @owner isn't available. |
| * |
| * 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. |
| */ |
| int device_schedule_callback_owner(struct device *dev, |
| void (*func)(struct device *), struct module *owner) |
| { |
| return sysfs_schedule_callback(&dev->kobj, |
| (void (*)(void *)) func, dev, owner); |
| } |
| EXPORT_SYMBOL_GPL(device_schedule_callback_owner); |
| |
| static void klist_children_get(struct klist_node *n) |
| { |
| struct device_private *p = to_device_private_parent(n); |
| struct device *dev = p->device; |
| |
| get_device(dev); |
| } |
| |
| static void klist_children_put(struct klist_node *n) |
| { |
| struct device_private *p = to_device_private_parent(n); |
| struct device *dev = p->device; |
| |
| put_device(dev); |
| } |
| |
| /** |
| * device_initialize - init device structure. |
| * @dev: device. |
| * |
| * This prepares the device for use by other layers by initializing |
| * its fields. |
| * It is the first half of device_register(), if called by |
| * 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. |
| * |
| * All fields in @dev must be initialized by the caller to 0, except |
| * for those explicitly set to some other value. The simplest |
| * approach is to use kzalloc() to allocate the structure containing |
| * @dev. |
| * |
| * NOTE: Use put_device() to give up your reference instead of freeing |
| * @dev directly once you have called this function. |
| */ |
| void device_initialize(struct device *dev) |
| { |
| dev->kobj.kset = devices_kset; |
| kobject_init(&dev->kobj, &device_ktype); |
| INIT_LIST_HEAD(&dev->dma_pools); |
| mutex_init(&dev->mutex); |
| lockdep_set_novalidate_class(&dev->mutex); |
| spin_lock_init(&dev->devres_lock); |
| INIT_LIST_HEAD(&dev->devres_head); |
| device_pm_init(dev); |
| set_dev_node(dev, -1); |
| } |
| EXPORT_SYMBOL_GPL(device_initialize); |
| |
| struct kobject *virtual_device_parent(struct device *dev) |
| { |
| static struct kobject *virtual_dir = NULL; |
| |
| if (!virtual_dir) |
| virtual_dir = kobject_create_and_add("virtual", |
| &devices_kset->kobj); |
| |
| return virtual_dir; |
| } |
| |
| 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) |
| { |
| 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; |
| int retval; |
| |
| 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->glue_dirs; |
| |
| retval = kobject_add(&dir->kobj, parent_kobj, "%s", class->name); |
| if (retval < 0) { |
| kobject_put(&dir->kobj); |
| return NULL; |
| } |
| return &dir->kobj; |
| } |
| |
| static DEFINE_MUTEX(gdp_mutex); |
| |
| static struct kobject *get_device_parent(struct device *dev, |
| struct device *parent) |
| { |
| if (dev->class) { |
| struct kobject *kobj = NULL; |
| struct kobject *parent_kobj; |
| struct kobject *k; |
| |
| #ifdef CONFIG_BLOCK |
| /* block disks show up in /sys/block */ |
| if (sysfs_deprecated && dev->class == &block_class) { |
| if (parent && parent->class == &block_class) |
| return &parent->kobj; |
| return &block_class.p->subsys.kobj; |
| } |
| #endif |
| |
| /* |
| * If we have no parent, we live in "virtual". |
| * Class-devices with a non class-device as parent, live |
| * in a "glue" directory to prevent namespace collisions. |
| */ |
| if (parent == NULL) |
| parent_kobj = virtual_device_parent(dev); |
| else if (parent->class && !dev->class->ns_type) |
| return &parent->kobj; |
| else |
| parent_kobj = &parent->kobj; |
| |
| mutex_lock(&gdp_mutex); |
| |
| /* find our class-directory at the parent and reference it */ |
| spin_lock(&dev->class->p->glue_dirs.list_lock); |
| list_for_each_entry(k, &dev->class->p->glue_dirs.list, entry) |
| if (k->parent == parent_kobj) { |
| kobj = kobject_get(k); |
| break; |
| } |
| spin_unlock(&dev->class->p->glue_dirs.list_lock); |
| if (kobj) { |
| mutex_unlock(&gdp_mutex); |
| return kobj; |
| } |
| |
| /* or create a new class-directory at the parent device */ |
| k = class_dir_create_and_add(dev->class, parent_kobj); |
| /* do not emit an uevent for this simple "glue" directory */ |
| mutex_unlock(&gdp_mutex); |
| return k; |
| } |
| |
| /* subsystems can specify a default root directory for their devices */ |
| if (!parent && dev->bus && dev->bus->dev_root) |
| return &dev->bus->dev_root->kobj; |
| |
| if (parent) |
| return &parent->kobj; |
| return NULL; |
| } |
| |
| static void cleanup_glue_dir(struct device *dev, struct kobject *glue_dir) |
| { |
| /* see if we live in a "glue" directory */ |
| if (!glue_dir || !dev->class || |
| glue_dir->kset != &dev->class->p->glue_dirs) |
| return; |
| |
| mutex_lock(&gdp_mutex); |
| kobject_put(glue_dir); |
| mutex_unlock(&gdp_mutex); |
| } |
| |
| static void cleanup_device_parent(struct device *dev) |
| { |
| cleanup_glue_dir(dev, dev->kobj.parent); |
| } |
| |
| static int device_add_class_symlinks(struct device *dev) |
| { |
| int error; |
| |
| if (!dev->class) |
| return 0; |
| |
| error = sysfs_create_link(&dev->kobj, |
| &dev->class->p->subsys.kobj, |
| "subsystem"); |
| if (error) |
| goto out; |
| |
| if (dev->parent && device_is_not_partition(dev)) { |
| error = sysfs_create_link(&dev->kobj, &dev->parent->kobj, |
| "device"); |
| if (error) |
| goto out_subsys; |
| } |
| |
| #ifdef CONFIG_BLOCK |
| /* /sys/block has directories and does not need symlinks */ |
| if (sysfs_deprecated && dev->class == &block_class) |
| return 0; |
| #endif |
| |
| /* link in the class directory pointing to the device */ |
| error = sysfs_create_link(&dev->class->p->subsys.kobj, |
| &dev->kobj, dev_name(dev)); |
| if (error) |
| goto out_device; |
| |
| return 0; |
| |
| out_device: |
| sysfs_remove_link(&dev->kobj, "device"); |
| |
| out_subsys: |
| sysfs_remove_link(&dev->kobj, "subsystem"); |
| out: |
| return error; |
| } |
| |
| static void device_remove_class_symlinks(struct device *dev) |
| { |
| if (!dev->class) |
| return; |
| |
| if (dev->parent && device_is_not_partition(dev)) |
| sysfs_remove_link(&dev->kobj, "device"); |
| sysfs_remove_link(&dev->kobj, "subsystem"); |
| #ifdef CONFIG_BLOCK |
| if (sysfs_deprecated && dev->class == &block_class) |
| return; |
| #endif |
| sysfs_delete_link(&dev->class->p->subsys.kobj, &dev->kobj, dev_name(dev)); |
| } |
| |
| /** |
| * dev_set_name - set a device name |
| * @dev: device |
| * @fmt: format string for the device's name |
| */ |
| int dev_set_name(struct device *dev, const char *fmt, ...) |
| { |
| va_list vargs; |
| int err; |
| |
| va_start(vargs, fmt); |
| err = kobject_set_name_vargs(&dev->kobj, fmt, vargs); |
| va_end(vargs); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(dev_set_name); |
| |
| /** |
| * 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 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); |
| } |
| } |
| |
| 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); |
| INIT_LIST_HEAD(&dev->p->deferred_probe); |
| return 0; |
| } |
| |
| /** |
| * device_add - add device to device hierarchy. |
| * @dev: device. |
| * |
| * This is part 2 of device_register(), though may be called |
| * separately _iff_ device_initialize() has been called separately. |
| * |
| * This adds @dev to the kobject hierarchy via kobject_add(), adds it |
| * to the global and sibling lists for the device, then |
| * adds it to the other relevant subsystems of the driver model. |
| * |
| * Do not call this routine or device_register() more than once for |
| * any device structure. The driver model core is not designed to work |
| * with devices that get unregistered and then spring back to life. |
| * (Among other things, it's very hard to guarantee that all references |
| * to the previous incarnation of @dev have been dropped.) Allocate |
| * and register a fresh new struct device instead. |
| * |
| * 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. |
| */ |
| int device_add(struct device *dev) |
| { |
| struct device *parent = NULL; |
| struct kobject *kobj; |
| struct class_interface *class_intf; |
| int error = -EINVAL; |
| |
| dev = get_device(dev); |
| if (!dev) |
| goto done; |
| |
| if (!dev->p) { |
| error = device_private_init(dev); |
| if (error) |
| goto done; |
| } |
| |
| /* |
| * 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) { |
| dev_set_name(dev, "%s", dev->init_name); |
| dev->init_name = NULL; |
| } |
| |
| /* subsystems can specify simple device enumeration */ |
| if (!dev_name(dev) && dev->bus && dev->bus->dev_name) |
| dev_set_name(dev, "%s%u", dev->bus->dev_name, dev->id); |
| |
| if (!dev_name(dev)) { |
| error = -EINVAL; |
| goto name_error; |
| } |
| |
| pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| |
| parent = get_device(dev->parent); |
| kobj = get_device_parent(dev, parent); |
| if (kobj) |
| dev->kobj.parent = kobj; |
| |
| /* use parent numa_node */ |
| if (parent) |
| set_dev_node(dev, dev_to_node(parent)); |
| |
| /* first, register with generic layer. */ |
| /* we require the name to be set before, and pass NULL */ |
| error = kobject_add(&dev->kobj, dev->kobj.parent, NULL); |
| if (error) |
| goto Error; |
| |
| /* notify platform of device entry */ |
| if (platform_notify) |
| platform_notify(dev); |
| |
| error = device_create_file(dev, &dev_attr_uevent); |
| if (error) |
| goto attrError; |
| |
| if (MAJOR(dev->devt)) { |
| error = device_create_file(dev, &dev_attr_dev); |
| if (error) |
| goto ueventattrError; |
| |
| error = device_create_sys_dev_entry(dev); |
| if (error) |
| goto devtattrError; |
| |
| devtmpfs_create_node(dev); |
| } |
| |
| error = device_add_class_symlinks(dev); |
| if (error) |
| goto SymlinkError; |
| error = device_add_attrs(dev); |
| if (error) |
| goto AttrsError; |
| error = bus_add_device(dev); |
| if (error) |
| goto BusError; |
| error = dpm_sysfs_add(dev); |
| if (error) |
| goto DPMError; |
| device_pm_add(dev); |
| |
| /* Notify clients of device addition. This call must come |
| * after dpm_sysfs_add() and before kobject_uevent(). |
| */ |
| if (dev->bus) |
| blocking_notifier_call_chain(&dev->bus->p->bus_notifier, |
| BUS_NOTIFY_ADD_DEVICE, dev); |
| |
| kobject_uevent(&dev->kobj, KOBJ_ADD); |
| bus_probe_device(dev); |
| if (parent) |
| klist_add_tail(&dev->p->knode_parent, |
| &parent->p->klist_children); |
| |
| if (dev->class) { |
| mutex_lock(&dev->class->p->mutex); |
| /* tie the class to the device */ |
| klist_add_tail(&dev->knode_class, |
| &dev->class->p->klist_devices); |
| |
| /* notify any interfaces that the device is here */ |
| list_for_each_entry(class_intf, |
| &dev->class->p->interfaces, node) |
| if (class_intf->add_dev) |
| class_intf->add_dev(dev, class_intf); |
| mutex_unlock(&dev->class->p->mutex); |
| } |
| done: |
| put_device(dev); |
| return error; |
| DPMError: |
| bus_remove_device(dev); |
| BusError: |
| device_remove_attrs(dev); |
| AttrsError: |
| device_remove_class_symlinks(dev); |
| SymlinkError: |
| if (MAJOR(dev->devt)) |
| devtmpfs_delete_node(dev); |
| if (MAJOR(dev->devt)) |
| device_remove_sys_dev_entry(dev); |
| devtattrError: |
| if (MAJOR(dev->devt)) |
| device_remove_file(dev, &dev_attr_dev); |
| ueventattrError: |
| device_remove_file(dev, &dev_attr_uevent); |
| attrError: |
| kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
| kobject_del(&dev->kobj); |
| Error: |
| cleanup_device_parent(dev); |
| if (parent) |
| put_device(parent); |
| name_error: |
| kfree(dev->p); |
| dev->p = NULL; |
| goto done; |
| } |
| EXPORT_SYMBOL_GPL(device_add); |
| |
| /** |
| * device_register - register a device with the system. |
| * @dev: pointer to the device structure |
| * |
| * 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. |
| * |
| * For more information, see the kerneldoc for device_initialize() |
| * and device_add(). |
| * |
| * 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. |
| */ |
| int device_register(struct device *dev) |
| { |
| device_initialize(dev); |
| return device_add(dev); |
| } |
| EXPORT_SYMBOL_GPL(device_register); |
| |
| /** |
| * get_device - increment reference count for device. |
| * @dev: device. |
| * |
| * 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. |
| */ |
| struct device *get_device(struct device *dev) |
| { |
| return dev ? kobj_to_dev(kobject_get(&dev->kobj)) : NULL; |
| } |
| EXPORT_SYMBOL_GPL(get_device); |
| |
| /** |
| * put_device - decrement reference count. |
| * @dev: device in question. |
| */ |
| void put_device(struct device *dev) |
| { |
| /* might_sleep(); */ |
| if (dev) |
| kobject_put(&dev->kobj); |
| } |
| EXPORT_SYMBOL_GPL(put_device); |
| |
| /** |
| * device_del - delete device from system. |
| * @dev: device. |
| * |
| * 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. |
| * |
| * NOTE: this should be called manually _iff_ device_add() was |
| * also called manually. |
| */ |
| void device_del(struct device *dev) |
| { |
| struct device *parent = dev->parent; |
| struct class_interface *class_intf; |
| |
| /* 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); |
| dpm_sysfs_remove(dev); |
| if (parent) |
| klist_del(&dev->p->knode_parent); |
| if (MAJOR(dev->devt)) { |
| devtmpfs_delete_node(dev); |
| device_remove_sys_dev_entry(dev); |
| device_remove_file(dev, &dev_attr_dev); |
| } |
| if (dev->class) { |
| device_remove_class_symlinks(dev); |
| |
| mutex_lock(&dev->class->p->mutex); |
| /* notify any interfaces that the device is now gone */ |
| list_for_each_entry(class_intf, |
| &dev->class->p->interfaces, node) |
| if (class_intf->remove_dev) |
| class_intf->remove_dev(dev, class_intf); |
| /* remove the device from the class list */ |
| klist_del(&dev->knode_class); |
| mutex_unlock(&dev->class->p->mutex); |
| } |
| device_remove_file(dev, &dev_attr_uevent); |
| device_remove_attrs(dev); |
| bus_remove_device(dev); |
| device_pm_remove(dev); |
| driver_deferred_probe_del(dev); |
| |
| /* Notify the platform of the removal, in case they |
| * need to do anything... |
| */ |
| if (platform_notify_remove) |
| platform_notify_remove(dev); |
| kobject_uevent(&dev->kobj, KOBJ_REMOVE); |
| cleanup_device_parent(dev); |
| kobject_del(&dev->kobj); |
| put_device(parent); |
| } |
| EXPORT_SYMBOL_GPL(device_del); |
| |
| /** |
| * device_unregister - unregister device from system. |
| * @dev: device going away. |
| * |
| * 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. |
| */ |
| void device_unregister(struct device *dev) |
| { |
| pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| device_del(dev); |
| put_device(dev); |
| } |
| EXPORT_SYMBOL_GPL(device_unregister); |
| |
| static struct device *next_device(struct klist_iter *i) |
| { |
| struct klist_node *n = klist_next(i); |
| struct device *dev = NULL; |
| struct device_private *p; |
| |
| if (n) { |
| p = to_device_private_parent(n); |
| dev = p->device; |
| } |
| return dev; |
| } |
| |
| /** |
| * device_get_devnode - path of device node file |
| * @dev: device |
| * @mode: returned file access mode |
| * @uid: returned file owner |
| * @gid: returned file group |
| * @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. |
| */ |
| const char *device_get_devnode(struct device *dev, |
| umode_t *mode, kuid_t *uid, kgid_t *gid, |
| const char **tmp) |
| { |
| char *s; |
| |
| *tmp = NULL; |
| |
| /* the device type may provide a specific name */ |
| if (dev->type && dev->type->devnode) |
| *tmp = dev->type->devnode(dev, mode, uid, gid); |
| if (*tmp) |
| return *tmp; |
| |
| /* the class may provide a specific name */ |
| if (dev->class && dev->class->devnode) |
| *tmp = dev->class->devnode(dev, mode); |
| 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; |
| } |
| |
| /** |
| * device_for_each_child - device child iterator. |
| * @parent: parent struct device. |
| * @fn: function to be called for each device. |
| * @data: data for the callback. |
| * |
| * Iterate over @parent's child devices, and call @fn for each, |
| * passing it @data. |
| * |
| * We check the return of @fn each time. If it returns anything |
| * other than 0, we break out and return that value. |
| */ |
| int device_for_each_child(struct device *parent, void *data, |
| int (*fn)(struct device *dev, void *data)) |
| { |
| struct klist_iter i; |
| struct device *child; |
| int error = 0; |
| |
| if (!parent->p) |
| return 0; |
| |
| klist_iter_init(&parent->p->klist_children, &i); |
| while ((child = next_device(&i)) && !error) |
| error = fn(child, data); |
| klist_iter_exit(&i); |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(device_for_each_child); |
| |
| /** |
| * device_find_child - device iterator for locating a particular device. |
| * @parent: parent struct device |
| * @match: Callback function to check device |
| * @data: Data to pass to match function |
| * |
| * 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. |
| * |
| * NOTE: you will need to drop the reference with put_device() after use. |
| */ |
| struct device *device_find_child(struct device *parent, void *data, |
| int (*match)(struct device *dev, void *data)) |
| { |
| struct klist_iter i; |
| struct device *child; |
| |
| if (!parent) |
| return NULL; |
| |
| klist_iter_init(&parent->p->klist_children, &i); |
| while ((child = next_device(&i))) |
| if (match(child, data) && get_device(child)) |
| break; |
| klist_iter_exit(&i); |
| return child; |
| } |
| EXPORT_SYMBOL_GPL(device_find_child); |
| |
| int __init devices_init(void) |
| { |
| devices_kset = kset_create_and_add("devices", &device_uevent_ops, NULL); |
| if (!devices_kset) |
| return -ENOMEM; |
| 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; |
| |
| return 0; |
| |
| 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; |
| } |
| |
| static int device_check_offline(struct device *dev, void *not_used) |
| { |
| int ret; |
| |
| ret = device_for_each_child(dev, NULL, device_check_offline); |
| if (ret) |
| return ret; |
| |
| return device_supports_offline(dev) && !dev->offline ? -EBUSY : 0; |
| } |
| |
| /** |
| * device_offline - Prepare the device for hot-removal. |
| * @dev: Device to be put offline. |
| * |
| * Execute the device bus type's .offline() callback, if present, to prepare |
| * the device for a subsequent hot-removal. If that succeeds, the device must |
| * not be used until either it is removed or its bus type's .online() callback |
| * is executed. |
| * |
| * Call under device_hotplug_lock. |
| */ |
| int device_offline(struct device *dev) |
| { |
| int ret; |
| |
| if (dev->offline_disabled) |
| return -EPERM; |
| |
| ret = device_for_each_child(dev, NULL, device_check_offline); |
| if (ret) |
| return ret; |
| |
| device_lock(dev); |
| if (device_supports_offline(dev)) { |
| if (dev->offline) { |
| ret = 1; |
| } else { |
| ret = dev->bus->offline(dev); |
| if (!ret) { |
| kobject_uevent(&dev->kobj, KOBJ_OFFLINE); |
| dev->offline = true; |
| } |
| } |
| } |
| device_unlock(dev); |
| |
| return ret; |
| } |
| |
| /** |
| * device_online - Put the device back online after successful device_offline(). |
| * @dev: Device to be put back online. |
| * |
| * If device_offline() has been successfully executed for @dev, but the device |
| * has not been removed subsequently, execute its bus type's .online() callback |
| * to indicate that the device can be used again. |
| * |
| * Call under device_hotplug_lock. |
| */ |
| int device_online(struct device *dev) |
| { |
| int ret = 0; |
| |
| device_lock(dev); |
| if (device_supports_offline(dev)) { |
| if (dev->offline) { |
| ret = dev->bus->online(dev); |
| if (!ret) { |
| kobject_uevent(&dev->kobj, KOBJ_ONLINE); |
| dev->offline = false; |
| } |
| } else { |
| ret = 1; |
| } |
| } |
| device_unlock(dev); |
| |
| return ret; |
| } |
| |
| struct root_device { |
| struct device dev; |
| struct module *owner; |
| }; |
| |
| static inline struct root_device *to_root_device(struct device *d) |
| { |
| return container_of(d, 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. |
| * |
| * Returns &struct device pointer on success, or ERR_PTR() on error. |
| * |
| * 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); |
| |
| err = dev_set_name(&root->dev, "%s", name); |
| 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); |
| } |
| |
| #ifdef CONFIG_MODULES /* gotta find a "cleaner" way to do this */ |
| 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 |
| * @dev: device going away |
| * |
| * 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); |
| |
| |
| static void device_create_release(struct device *dev) |
| { |
| pr_debug("device: '%s': %s\n", dev_name(dev), __func__); |
| kfree(dev); |
| } |
| |
| static struct device * |
| device_create_groups_vargs(struct class *class, struct device *parent, |
| dev_t devt, void *drvdata, |
| const struct attribute_group **groups, |
| const char *fmt, va_list args) |
| { |
| struct device *dev = NULL; |
| int retval = -ENODEV; |
| |
| if (class == NULL || IS_ERR(class)) |
| goto error; |
| |
| dev = kzalloc(sizeof(*dev), GFP_KERNEL); |
| if (!dev) { |
| retval = -ENOMEM; |
| goto error; |
| } |
| |
| device_initialize(dev); |
| dev->devt = devt; |
| dev->class = class; |
| dev->parent = parent; |
| dev->groups = groups; |
| dev->release = device_create_release; |
| dev_set_drvdata(dev, drvdata); |
| |
| retval = kobject_set_name_vargs(&dev->kobj, fmt, args); |
| if (retval) |
| goto error; |
| |
| retval = device_add(dev); |
| if (retval) |
| goto error; |
| |
| return dev; |
| |
| error: |
| put_device(dev); |
| return ERR_PTR(retval); |
| } |
| |
| /** |
| * device_create_vargs - creates a device and registers it with sysfs |
| * @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 |
| * @args: va_list 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. |
| * |
| * Returns &struct device pointer on success, or ERR_PTR() on error. |
| * |
| * Note: the struct class passed to this function must have previously |
| * been created with a call to class_create(). |
| */ |
| struct device *device_create_vargs(struct class *class, struct device *parent, |
| dev_t devt, void *drvdata, const char *fmt, |
| va_list args) |
| { |
| return device_create_groups_vargs(class, parent, devt, drvdata, NULL, |
| fmt, args); |
| } |
| EXPORT_SYMBOL_GPL(device_create_vargs); |
| |
| /** |
| * device_create - creates a device and registers it with sysfs |
| * @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. |
| * |
| * Returns &struct device pointer on success, or ERR_PTR() on error. |
| * |
| * Note: the struct class passed to this function must have previously |
| * been created with a call to class_create(). |
| */ |
| struct device *device_create(struct class *class, struct device *parent, |
| dev_t devt, void *drvdata, const char *fmt, ...) |
| { |
| 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; |
| } |
| EXPORT_SYMBOL_GPL(device_create); |
| |
| /** |
| * device_create_with_groups - creates a device and registers it with sysfs |
| * @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 |
| * @groups: NULL-terminated list of attribute groups to be created |
| * @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. |
| * Additional attributes specified in the groups parameter will also |
| * be created automatically. |
| * |
| * 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. |
| * |
| * Returns &struct device pointer on success, or ERR_PTR() on error. |
| * |
| * Note: the struct class passed to this function must have previously |
| * been created with a call to class_create(). |
| */ |
| struct device *device_create_with_groups(struct class *class, |
| struct device *parent, dev_t devt, |
| void *drvdata, |
| const struct attribute_group **groups, |
| const char *fmt, ...) |
| { |
| va_list vargs; |
| struct device *dev; |
| |
| va_start(vargs, fmt); |
| dev = device_create_groups_vargs(class, parent, devt, drvdata, groups, |
| fmt, vargs); |
| va_end(vargs); |
| return dev; |
| } |
| EXPORT_SYMBOL_GPL(device_create_with_groups); |
| |
| static int __match_devt(struct device *dev, const void *data) |
| { |
| const dev_t *devt = data; |
| |
| return dev->devt == *devt; |
| } |
| |
| /** |
| * 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; |
| |
| dev = class_find_device(class, NULL, &devt, __match_devt); |
| if (dev) { |
| put_device(dev); |
| device_unregister(dev); |
| } |
| } |
| EXPORT_SYMBOL_GPL(device_destroy); |
| |
| /** |
| * device_rename - renames a device |
| * @dev: the pointer to the struct device to be renamed |
| * @new_name: the new name of the device |
| * |
| * 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. |
| * |
| * Note: Don't call this function. Currently, the networking layer calls this |
| * function, but that will change. The following text from Kay Sievers offers |
| * some insight: |
| * |
| * Renaming devices is racy at many levels, symlinks and other stuff are not |
| * replaced atomically, and you get a "move" uevent, but it's not easy to |
| * connect the event to the old and new device. Device nodes are not renamed at |
| * all, there isn't even support for that in the kernel now. |
| * |
| * In the meantime, during renaming, your target name might be taken by another |
| * driver, creating conflicts. Or the old name is taken directly after you |
| * renamed it -- then you get events for the same DEVPATH, before you even see |
| * the "move" event. It's just a mess, and nothing new should ever rely on |
| * kernel device renaming. Besides that, it's not even implemented now for |
| * other things than (driver-core wise very simple) network devices. |
| * |
| * We are currently about to change network renaming in udev to completely |
| * disallow renaming of devices in the same namespace as the kernel uses, |
| * because we can't solve the problems properly, that arise with swapping names |
| * of multiple interfaces without races. Means, renaming of eth[0-9]* will only |
| * be allowed to some other name than eth[0-9]*, for the aforementioned |
| * reasons. |
| * |
| * Make up a "real" name in the driver before you register anything, or add |
| * some other attributes for userspace to find the device, or use udev to add |
| * symlinks -- but never rename kernel devices later, it's a complete mess. We |
| * don't even want to get into that and try to implement the missing pieces in |
| * the core. We really have other pieces to fix in the driver core mess. :) |
| */ |
| int device_rename(struct device *dev, const char *new_name) |
| { |
| struct kobject *kobj = &dev->kobj; |
| char *old_device_name = NULL; |
| int error; |
| |
| dev = get_device(dev); |
| if (!dev) |
| return -EINVAL; |
| |
| dev_dbg(dev, "renaming to %s\n", new_name); |
| |
| old_device_name = kstrdup(dev_name(dev), GFP_KERNEL); |
| if (!old_device_name) { |
| error = -ENOMEM; |
| goto out; |
| } |
| |
| if (dev->class) { |
| error = sysfs_rename_link_ns(&dev->class->p->subsys.kobj, |
| kobj, old_device_name, |
| new_name, kobject_namespace(kobj)); |
| if (error) |
| goto out; |
| } |
| |
| error = kobject_rename(kobj, new_name); |
| if (error) |
| goto out; |
| |
| out: |
| put_device(dev); |
| |
| kfree(old_device_name); |
| |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(device_rename); |
| |
| static int device_move_class_links(struct device *dev, |
| struct device *old_parent, |
| struct device *new_parent) |
| { |
| int error = 0; |
| |
| if (old_parent) |
| sysfs_remove_link(&dev->kobj, "device"); |
| if (new_parent) |
| error = sysfs_create_link(&dev->kobj, &new_parent->kobj, |
| "device"); |
| return error; |
| } |
| |
| /** |
| * device_move - moves a device to a new parent |
| * @dev: the pointer to the struct device to be moved |
| * @new_parent: the new parent of the device (can by NULL) |
| * @dpm_order: how to reorder the dpm_list |
| */ |
| int device_move(struct device *dev, struct device *new_parent, |
| enum dpm_order dpm_order) |
| { |
| int error; |
| struct device *old_parent; |
| struct kobject *new_parent_kobj; |
| |
| dev = get_device(dev); |
| if (!dev) |
| return -EINVAL; |
| |
| device_pm_lock(); |
| new_parent = get_device(new_parent); |
| new_parent_kobj = get_device_parent(dev, new_parent); |
| |
| pr_debug("device: '%s': %s: moving to '%s'\n", dev_name(dev), |
| __func__, new_parent ? dev_name(new_parent) : "<NULL>"); |
| error = kobject_move(&dev->kobj, new_parent_kobj); |
| if (error) { |
| cleanup_glue_dir(dev, new_parent_kobj); |
| put_device(new_parent); |
| goto out; |
| } |
| old_parent = dev->parent; |
| dev->parent = new_parent; |
| if (old_parent) |
| klist_remove(&dev->p->knode_parent); |
| if (new_parent) { |
| klist_add_tail(&dev->p->knode_parent, |
| &new_parent->p->klist_children); |
| set_dev_node(dev, dev_to_node(new_parent)); |
| } |
| |
| if (dev->class) { |
| 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)) { |
| if (new_parent) |
| klist_remove(&dev->p->knode_parent); |
| dev->parent = old_parent; |
| if (old_parent) { |
| klist_add_tail(&dev->p->knode_parent, |
| &old_parent->p->klist_children); |
| set_dev_node(dev, dev_to_node(old_parent)); |
| } |
| } |
| cleanup_glue_dir(dev, new_parent_kobj); |
| put_device(new_parent); |
| goto out; |
| } |
| } |
| 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; |
| } |
| |
| put_device(old_parent); |
| out: |
| device_pm_unlock(); |
| put_device(dev); |
| return error; |
| } |
| EXPORT_SYMBOL_GPL(device_move); |
| |
| /** |
| * device_shutdown - call ->shutdown() on each device to shutdown. |
| */ |
| void device_shutdown(void) |
| { |
| struct device *dev, *parent; |
| |
| 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); |
| |
| /* |
| * hold reference count of device's parent to |
| * prevent it from being freed because parent's |
| * lock is to be held |
| */ |
| parent = get_device(dev->parent); |
| 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); |
| |
| /* hold lock to avoid race with probe/release */ |
| if (parent) |
| device_lock(parent); |
| device_lock(dev); |
| |
| /* Don't allow any more runtime suspends */ |
| pm_runtime_get_noresume(dev); |
| pm_runtime_barrier(dev); |
| |
| if (dev->bus && dev->bus->shutdown) { |
| if (initcall_debug) |
| dev_info(dev, "shutdown\n"); |
| dev->bus->shutdown(dev); |
| } else if (dev->driver && dev->driver->shutdown) { |
| if (initcall_debug) |
| dev_info(dev, "shutdown\n"); |
| dev->driver->shutdown(dev); |
| } |
| |
| device_unlock(dev); |
| if (parent) |
| device_unlock(parent); |
| |
| put_device(dev); |
| put_device(parent); |
| |
| spin_lock(&devices_kset->list_lock); |
| } |
| spin_unlock(&devices_kset->list_lock); |
| async_synchronize_full(); |
| } |
| |
| /* |
| * Device logging functions |
| */ |
| |
| #ifdef CONFIG_PRINTK |
| static int |
| create_syslog_header(const struct device *dev, char *hdr, size_t hdrlen) |
| { |
| const char *subsys; |
| size_t pos = 0; |
| |
| if (dev->class) |
| subsys = dev->class->name; |
| else if (dev->bus) |
| subsys = dev->bus->name; |
| else |
| return 0; |
| |
| pos += snprintf(hdr + pos, hdrlen - pos, "SUBSYSTEM=%s", subsys); |
| |
| /* |
| * Add device identifier DEVICE=: |
| * b12:8 block dev_t |
| * c127:3 char dev_t |
| * n8 netdev ifindex |
| * +sound:card0 subsystem:devname |
| */ |
| if (MAJOR(dev->devt)) { |
| char c; |
| |
| if (strcmp(subsys, "block") == 0) |
| c = 'b'; |
| else |
| c = 'c'; |
| pos++; |
| pos += snprintf(hdr + pos, hdrlen - pos, |
| "DEVICE=%c%u:%u", |
| c, MAJOR(dev->devt), MINOR(dev->devt)); |
| } else if (strcmp(subsys, "net") == 0) { |
| struct net_device *net = to_net_dev(dev); |
| |
| pos++; |
| pos += snprintf(hdr + pos, hdrlen - pos, |
| "DEVICE=n%u", net->ifindex); |
| } else { |
| pos++; |
| pos += snprintf(hdr + pos, hdrlen - pos, |
| "DEVICE=+%s:%s", subsys, dev_name(dev)); |
| } |
| |
| return pos; |
| } |
| EXPORT_SYMBOL(create_syslog_header); |
| |
| int dev_vprintk_emit(int level, const struct device *dev, |
| const char *fmt, va_list args) |
| { |
| char hdr[128]; |
| size_t hdrlen; |
| |
| hdrlen = create_syslog_header(dev, hdr, sizeof(hdr)); |
| |
| return vprintk_emit(0, level, hdrlen ? hdr : NULL, hdrlen, fmt, args); |
| } |
| EXPORT_SYMBOL(dev_vprintk_emit); |
| |
| int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) |
| { |
| va_list args; |
| int r; |
| |
| va_start(args, fmt); |
| |
| r = dev_vprintk_emit(level, dev, fmt, args); |
| |
| va_end(args); |
| |
| return r; |
| } |
| EXPORT_SYMBOL(dev_printk_emit); |
| |
| 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 dev_printk_emit(level[1] - '0', dev, |
| "%s %s: %pV", |
| 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 |