diff options
Diffstat (limited to 'drivers/base/core.c')
| -rw-r--r-- | drivers/base/core.c | 1904 |
1 files changed, 1904 insertions, 0 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c new file mode 100644 index 00000000..e28ce989 --- /dev/null +++ b/drivers/base/core.c @@ -0,0 +1,1904 @@ +/* + * 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 "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 __init int sysfs_deprecated_setup(char *arg) +{ + return strict_strtol(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; + +#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 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. + */ +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(obj) container_of(obj, struct device, kobj) +#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 = 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 = 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); + +/** + * 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 = to_dev(kobj); + struct device_private *p = dev->p; + + 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 = 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 = 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 = 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 = 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; + + add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt)); + add_uevent_var(env, "MINOR=%u", MINOR(dev->devt)); + name = device_get_devnode(dev, &mode, &tmp); + if (name) { + add_uevent_var(env, "DEVNAME=%s", name); + kfree(tmp); + if (mode) + add_uevent_var(env, "DEVMODE=%#o", mode & 0777); + } + } + + 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 show_uevent(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 store_uevent(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 struct device_attribute uevent_attr = + __ATTR(uevent, S_IRUGO | S_IWUSR, show_uevent, store_uevent); + +static int device_add_attributes(struct device *dev, + struct device_attribute *attrs) +{ + int error = 0; + int i; + + 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_bin_attributes(struct device *dev, + struct bin_attribute *attrs) +{ + int error = 0; + int i; + + if (attrs) { + for (i = 0; attr_name(attrs[i]); i++) { + error = device_create_bin_file(dev, &attrs[i]); + if (error) + break; + } + if (error) + while (--i >= 0) + device_remove_bin_file(dev, &attrs[i]); + } + return error; +} + +static void device_remove_bin_attributes(struct device *dev, + struct bin_attribute *attrs) +{ + int i; + + if (attrs) + for (i = 0; attr_name(attrs[i]); i++) + device_remove_bin_file(dev, &attrs[i]); +} + +static int device_add_groups(struct device *dev, + const struct attribute_group **groups) +{ + int error = 0; + int i; + + if (groups) { + for (i = 0; groups[i]; i++) { + error = sysfs_create_group(&dev->kobj, groups[i]); + if (error) { + while (--i >= 0) + sysfs_remove_group(&dev->kobj, + groups[i]); + break; + } + } + } + return error; +} + +static void device_remove_groups(struct device *dev, + const struct attribute_group **groups) +{ + int i; + + if (groups) + for (i = 0; groups[i]; i++) + sysfs_remove_group(&dev->kobj, groups[i]); +} + +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_attributes(dev, class->dev_attrs); + if (error) + return error; + error = device_add_bin_attributes(dev, class->dev_bin_attrs); + if (error) + goto err_remove_class_attrs; + } + + if (type) { + error = device_add_groups(dev, type->groups); + if (error) + goto err_remove_class_bin_attrs; + } + + 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_bin_attrs: + if (class) + device_remove_bin_attributes(dev, class->dev_bin_attrs); + err_remove_class_attrs: + if (class) + device_remove_attributes(dev, class->dev_attrs); + + return error; +} + +static void device_remove_attrs(struct device *dev) +{ + struct class *class = dev->class; + const struct device_type *type = dev->type; + + device_remove_groups(dev, dev->groups); + + if (type) + device_remove_groups(dev, type->groups); + + if (class) { + device_remove_attributes(dev, class->dev_attrs); + device_remove_bin_attributes(dev, class->dev_bin_attrs); + } +} + + +static ssize_t show_dev(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return print_dev_t(buf, dev->devt); +} + +static struct device_attribute devt_attr = + __ATTR(dev, S_IRUGO, show_dev, NULL); + +/* /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) + error = sysfs_create_file(&dev->kobj, &attr->attr); + return error; +} + +/** + * 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); +} + +/** + * 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); +} + +static 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 struct kobject *get_device_parent(struct device *dev, + struct device *parent) +{ + if (dev->class) { + static DEFINE_MUTEX(gdp_mutex); + 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; + + kobject_put(glue_dir); +} + +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 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, &uevent_attr); + if (error) + goto attrError; + + if (MAJOR(dev->devt)) { + error = device_create_file(dev, &devt_attr); + 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, &devt_attr); + ueventattrError: + device_remove_file(dev, &uevent_attr); + 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; +} + +/** + * 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); +} + +/** + * 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 ? to_dev(kobject_get(&dev->kobj)) : NULL; +} + +/** + * put_device - decrement reference count. + * @dev: device in question. + */ +void put_device(struct device *dev) +{ + /* might_sleep(); */ + if (dev) + kobject_put(&dev->kobj); +} + +/** + * 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); + device_pm_remove(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, &devt_attr); + } + 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, &uevent_attr); + device_remove_attrs(dev); + bus_remove_device(dev); + driver_deferred_probe_del(dev); + + /* + * 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); + + /* 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); +} + +/** + * 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); +} + +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 + * @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, 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); + 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. + * @data: data for the callback. + * @fn: function to be called for each device. + * + * 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; +} + +/** + * 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. + */ +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; +} + +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; +} + +EXPORT_SYMBOL_GPL(device_for_each_child); +EXPORT_SYMBOL_GPL(device_find_child); + +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); + +EXPORT_SYMBOL_GPL(device_create_file); +EXPORT_SYMBOL_GPL(device_remove_file); + +struct root_device { + struct device dev; + struct module *owner; +}; + +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); +} + +/** + * 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) +{ + 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; + } + + dev->devt = devt; + dev->class = class; + dev->parent = parent; + 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_register(dev); + if (retval) + goto error; + + return dev; + +error: + put_device(dev); + return ERR_PTR(retval); +} +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); + +static int __match_devt(struct device *dev, void *data) +{ + 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) +{ + char *old_class_name = NULL; + char *new_class_name = NULL; + char *old_device_name = NULL; + int error; + + dev = get_device(dev); + if (!dev) + return -EINVAL; + + pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev), + __func__, 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(&dev->class->p->subsys.kobj, + &dev->kobj, old_device_name, new_name); + if (error) + goto out; + } + + error = kobject_rename(&dev->kobj, new_name); + if (error) + goto out; + +out: + put_device(dev); + + kfree(new_class_name); + kfree(old_class_name); + 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) + 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)) { + 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; + } +out_put: + 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; + + 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); + + /* Don't allow any more runtime suspends */ + pm_runtime_get_noresume(dev); + pm_runtime_barrier(dev); + + if (dev->bus && dev->bus->shutdown) { + dev_dbg(dev, "shutdown\n"); + dev->bus->shutdown(dev); + } else if (dev->driver && dev->driver->shutdown) { + dev_dbg(dev, "shutdown\n"); + dev->driver->shutdown(dev); + } + put_device(dev); + + spin_lock(&devices_kset->list_lock); + } + spin_unlock(&devices_kset->list_lock); + async_synchronize_full(); +} + +/* + * Device logging functions + */ + +#ifdef CONFIG_PRINTK + +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); +} +EXPORT_SYMBOL(__dev_printk); + +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 |