diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/base/core.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/base/core.c | 1904 |
1 files changed, 0 insertions, 1904 deletions
diff --git a/ANDROID_3.4.5/drivers/base/core.c b/ANDROID_3.4.5/drivers/base/core.c deleted file mode 100644 index e28ce989..00000000 --- a/ANDROID_3.4.5/drivers/base/core.c +++ /dev/null @@ -1,1904 +0,0 @@ -/* - * 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 |