v4.19.13 snapshot.
diff --git a/include/linux/device.h b/include/linux/device.h
new file mode 100644
index 0000000..8f88254
--- /dev/null
+++ b/include/linux/device.h
@@ -0,0 +1,1609 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * device.h - generic, centralized driver model
+ *
+ * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
+ * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2008-2009 Novell Inc.
+ *
+ * See Documentation/driver-model/ for more information.
+ */
+
+#ifndef _DEVICE_H_
+#define _DEVICE_H_
+
+#include <linux/ioport.h>
+#include <linux/kobject.h>
+#include <linux/klist.h>
+#include <linux/list.h>
+#include <linux/lockdep.h>
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/pm.h>
+#include <linux/atomic.h>
+#include <linux/ratelimit.h>
+#include <linux/uidgid.h>
+#include <linux/gfp.h>
+#include <linux/overflow.h>
+#include <asm/device.h>
+
+struct device;
+struct device_private;
+struct device_driver;
+struct driver_private;
+struct module;
+struct class;
+struct subsys_private;
+struct bus_type;
+struct device_node;
+struct fwnode_handle;
+struct iommu_ops;
+struct iommu_group;
+struct iommu_fwspec;
+struct dev_pin_info;
+
+struct bus_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct bus_type *bus, char *buf);
+ ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
+};
+
+#define BUS_ATTR(_name, _mode, _show, _store) \
+ struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
+#define BUS_ATTR_RW(_name) \
+ struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
+#define BUS_ATTR_RO(_name) \
+ struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
+
+extern int __must_check bus_create_file(struct bus_type *,
+ struct bus_attribute *);
+extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
+
+/**
+ * struct bus_type - The bus type of the device
+ *
+ * @name: The name of the bus.
+ * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id).
+ * @dev_root: Default device to use as the parent.
+ * @bus_groups: Default attributes of the bus.
+ * @dev_groups: Default attributes of the devices on the bus.
+ * @drv_groups: Default attributes of the device drivers on the bus.
+ * @match: Called, perhaps multiple times, whenever a new device or driver
+ * is added for this bus. It should return a positive value if the
+ * given device can be handled by the given driver and zero
+ * otherwise. It may also return error code if determining that
+ * the driver supports the device is not possible. In case of
+ * -EPROBE_DEFER it will queue the device for deferred probing.
+ * @uevent: Called when a device is added, removed, or a few other things
+ * that generate uevents to add the environment variables.
+ * @probe: Called when a new device or driver add to this bus, and callback
+ * the specific driver's probe to initial the matched device.
+ * @remove: Called when a device removed from this bus.
+ * @shutdown: Called at shut-down time to quiesce the device.
+ *
+ * @online: Called to put the device back online (after offlining it).
+ * @offline: Called to put the device offline for hot-removal. May fail.
+ *
+ * @suspend: Called when a device on this bus wants to go to sleep mode.
+ * @resume: Called to bring a device on this bus out of sleep mode.
+ * @num_vf: Called to find out how many virtual functions a device on this
+ * bus supports.
+ * @dma_configure: Called to setup DMA configuration on a device on
+ * this bus.
+ * @pm: Power management operations of this bus, callback the specific
+ * device driver's pm-ops.
+ * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
+ * driver implementations to a bus and allow the driver to do
+ * bus-specific setup
+ * @p: The private data of the driver core, only the driver core can
+ * touch this.
+ * @lock_key: Lock class key for use by the lock validator
+ * @need_parent_lock: When probing or removing a device on this bus, the
+ * device core should lock the device's parent.
+ *
+ * A bus is a channel between the processor and one or more devices. For the
+ * purposes of the device model, all devices are connected via a bus, even if
+ * it is an internal, virtual, "platform" bus. Buses can plug into each other.
+ * A USB controller is usually a PCI device, for example. The device model
+ * represents the actual connections between buses and the devices they control.
+ * A bus is represented by the bus_type structure. It contains the name, the
+ * default attributes, the bus' methods, PM operations, and the driver core's
+ * private data.
+ */
+struct bus_type {
+ const char *name;
+ const char *dev_name;
+ struct device *dev_root;
+ const struct attribute_group **bus_groups;
+ const struct attribute_group **dev_groups;
+ const struct attribute_group **drv_groups;
+
+ int (*match)(struct device *dev, struct device_driver *drv);
+ int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
+ int (*probe)(struct device *dev);
+ int (*remove)(struct device *dev);
+ void (*shutdown)(struct device *dev);
+
+ int (*online)(struct device *dev);
+ int (*offline)(struct device *dev);
+
+ int (*suspend)(struct device *dev, pm_message_t state);
+ int (*resume)(struct device *dev);
+
+ int (*num_vf)(struct device *dev);
+
+ int (*dma_configure)(struct device *dev);
+
+ const struct dev_pm_ops *pm;
+
+ const struct iommu_ops *iommu_ops;
+
+ struct subsys_private *p;
+ struct lock_class_key lock_key;
+
+ bool need_parent_lock;
+};
+
+extern int __must_check bus_register(struct bus_type *bus);
+
+extern void bus_unregister(struct bus_type *bus);
+
+extern int __must_check bus_rescan_devices(struct bus_type *bus);
+
+/* iterator helpers for buses */
+struct subsys_dev_iter {
+ struct klist_iter ki;
+ const struct device_type *type;
+};
+void subsys_dev_iter_init(struct subsys_dev_iter *iter,
+ struct bus_type *subsys,
+ struct device *start,
+ const struct device_type *type);
+struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
+void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
+
+int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
+ int (*fn)(struct device *dev, void *data));
+struct device *bus_find_device(struct bus_type *bus, struct device *start,
+ void *data,
+ int (*match)(struct device *dev, void *data));
+struct device *bus_find_device_by_name(struct bus_type *bus,
+ struct device *start,
+ const char *name);
+struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
+ struct device *hint);
+int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
+ void *data, int (*fn)(struct device_driver *, void *));
+void bus_sort_breadthfirst(struct bus_type *bus,
+ int (*compare)(const struct device *a,
+ const struct device *b));
+/*
+ * Bus notifiers: Get notified of addition/removal of devices
+ * and binding/unbinding of drivers to devices.
+ * In the long run, it should be a replacement for the platform
+ * notify hooks.
+ */
+struct notifier_block;
+
+extern int bus_register_notifier(struct bus_type *bus,
+ struct notifier_block *nb);
+extern int bus_unregister_notifier(struct bus_type *bus,
+ struct notifier_block *nb);
+
+/* All 4 notifers below get called with the target struct device *
+ * as an argument. Note that those functions are likely to be called
+ * with the device lock held in the core, so be careful.
+ */
+#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
+#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
+#define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
+#define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
+ bound */
+#define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
+#define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
+ unbound */
+#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
+ from the device */
+#define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
+
+extern struct kset *bus_get_kset(struct bus_type *bus);
+extern struct klist *bus_get_device_klist(struct bus_type *bus);
+
+/**
+ * enum probe_type - device driver probe type to try
+ * Device drivers may opt in for special handling of their
+ * respective probe routines. This tells the core what to
+ * expect and prefer.
+ *
+ * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
+ * whether probed synchronously or asynchronously.
+ * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
+ * probing order is not essential for booting the system may
+ * opt into executing their probes asynchronously.
+ * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
+ * their probe routines to run synchronously with driver and
+ * device registration (with the exception of -EPROBE_DEFER
+ * handling - re-probing always ends up being done asynchronously).
+ *
+ * Note that the end goal is to switch the kernel to use asynchronous
+ * probing by default, so annotating drivers with
+ * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
+ * to speed up boot process while we are validating the rest of the
+ * drivers.
+ */
+enum probe_type {
+ PROBE_DEFAULT_STRATEGY,
+ PROBE_PREFER_ASYNCHRONOUS,
+ PROBE_FORCE_SYNCHRONOUS,
+};
+
+/**
+ * struct device_driver - The basic device driver structure
+ * @name: Name of the device driver.
+ * @bus: The bus which the device of this driver belongs to.
+ * @owner: The module owner.
+ * @mod_name: Used for built-in modules.
+ * @suppress_bind_attrs: Disables bind/unbind via sysfs.
+ * @probe_type: Type of the probe (synchronous or asynchronous) to use.
+ * @of_match_table: The open firmware table.
+ * @acpi_match_table: The ACPI match table.
+ * @probe: Called to query the existence of a specific device,
+ * whether this driver can work with it, and bind the driver
+ * to a specific device.
+ * @remove: Called when the device is removed from the system to
+ * unbind a device from this driver.
+ * @shutdown: Called at shut-down time to quiesce the device.
+ * @suspend: Called to put the device to sleep mode. Usually to a
+ * low power state.
+ * @resume: Called to bring a device from sleep mode.
+ * @groups: Default attributes that get created by the driver core
+ * automatically.
+ * @pm: Power management operations of the device which matched
+ * this driver.
+ * @coredump: Called when sysfs entry is written to. The device driver
+ * is expected to call the dev_coredump API resulting in a
+ * uevent.
+ * @p: Driver core's private data, no one other than the driver
+ * core can touch this.
+ *
+ * The device driver-model tracks all of the drivers known to the system.
+ * The main reason for this tracking is to enable the driver core to match
+ * up drivers with new devices. Once drivers are known objects within the
+ * system, however, a number of other things become possible. Device drivers
+ * can export information and configuration variables that are independent
+ * of any specific device.
+ */
+struct device_driver {
+ const char *name;
+ struct bus_type *bus;
+
+ struct module *owner;
+ const char *mod_name; /* used for built-in modules */
+
+ bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
+ enum probe_type probe_type;
+
+ const struct of_device_id *of_match_table;
+ const struct acpi_device_id *acpi_match_table;
+
+ int (*probe) (struct device *dev);
+ int (*remove) (struct device *dev);
+ void (*shutdown) (struct device *dev);
+ int (*suspend) (struct device *dev, pm_message_t state);
+ int (*resume) (struct device *dev);
+ const struct attribute_group **groups;
+
+ const struct dev_pm_ops *pm;
+ void (*coredump) (struct device *dev);
+
+ struct driver_private *p;
+};
+
+
+extern int __must_check driver_register(struct device_driver *drv);
+extern void driver_unregister(struct device_driver *drv);
+
+extern struct device_driver *driver_find(const char *name,
+ struct bus_type *bus);
+extern int driver_probe_done(void);
+extern void wait_for_device_probe(void);
+
+/* sysfs interface for exporting driver attributes */
+
+struct driver_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct device_driver *driver, char *buf);
+ ssize_t (*store)(struct device_driver *driver, const char *buf,
+ size_t count);
+};
+
+#define DRIVER_ATTR_RW(_name) \
+ struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
+#define DRIVER_ATTR_RO(_name) \
+ struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
+#define DRIVER_ATTR_WO(_name) \
+ struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
+
+extern int __must_check driver_create_file(struct device_driver *driver,
+ const struct driver_attribute *attr);
+extern void driver_remove_file(struct device_driver *driver,
+ const struct driver_attribute *attr);
+
+extern int __must_check driver_for_each_device(struct device_driver *drv,
+ struct device *start,
+ void *data,
+ int (*fn)(struct device *dev,
+ void *));
+struct device *driver_find_device(struct device_driver *drv,
+ struct device *start, void *data,
+ int (*match)(struct device *dev, void *data));
+
+int driver_deferred_probe_check_state(struct device *dev);
+
+/**
+ * struct subsys_interface - interfaces to device functions
+ * @name: name of the device function
+ * @subsys: subsytem of the devices to attach to
+ * @node: the list of functions registered at the subsystem
+ * @add_dev: device hookup to device function handler
+ * @remove_dev: device hookup to device function handler
+ *
+ * Simple interfaces attached to a subsystem. Multiple interfaces can
+ * attach to a subsystem and its devices. Unlike drivers, they do not
+ * exclusively claim or control devices. Interfaces usually represent
+ * a specific functionality of a subsystem/class of devices.
+ */
+struct subsys_interface {
+ const char *name;
+ struct bus_type *subsys;
+ struct list_head node;
+ int (*add_dev)(struct device *dev, struct subsys_interface *sif);
+ void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
+};
+
+int subsys_interface_register(struct subsys_interface *sif);
+void subsys_interface_unregister(struct subsys_interface *sif);
+
+int subsys_system_register(struct bus_type *subsys,
+ const struct attribute_group **groups);
+int subsys_virtual_register(struct bus_type *subsys,
+ const struct attribute_group **groups);
+
+/**
+ * struct class - device classes
+ * @name: Name of the class.
+ * @owner: The module owner.
+ * @class_groups: Default attributes of this class.
+ * @dev_groups: Default attributes of the devices that belong to the class.
+ * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
+ * @dev_uevent: Called when a device is added, removed from this class, or a
+ * few other things that generate uevents to add the environment
+ * variables.
+ * @devnode: Callback to provide the devtmpfs.
+ * @class_release: Called to release this class.
+ * @dev_release: Called to release the device.
+ * @shutdown_pre: Called at shut-down time before driver shutdown.
+ * @ns_type: Callbacks so sysfs can detemine namespaces.
+ * @namespace: Namespace of the device belongs to this class.
+ * @get_ownership: Allows class to specify uid/gid of the sysfs directories
+ * for the devices belonging to the class. Usually tied to
+ * device's namespace.
+ * @pm: The default device power management operations of this class.
+ * @p: The private data of the driver core, no one other than the
+ * driver core can touch this.
+ *
+ * A class is a higher-level view of a device that abstracts out low-level
+ * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
+ * at the class level, they are all simply disks. Classes allow user space
+ * to work with devices based on what they do, rather than how they are
+ * connected or how they work.
+ */
+struct class {
+ const char *name;
+ struct module *owner;
+
+ const struct attribute_group **class_groups;
+ const struct attribute_group **dev_groups;
+ struct kobject *dev_kobj;
+
+ int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
+ char *(*devnode)(struct device *dev, umode_t *mode);
+
+ void (*class_release)(struct class *class);
+ void (*dev_release)(struct device *dev);
+
+ int (*shutdown_pre)(struct device *dev);
+
+ const struct kobj_ns_type_operations *ns_type;
+ const void *(*namespace)(struct device *dev);
+
+ void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
+
+ const struct dev_pm_ops *pm;
+
+ struct subsys_private *p;
+};
+
+struct class_dev_iter {
+ struct klist_iter ki;
+ const struct device_type *type;
+};
+
+extern struct kobject *sysfs_dev_block_kobj;
+extern struct kobject *sysfs_dev_char_kobj;
+extern int __must_check __class_register(struct class *class,
+ struct lock_class_key *key);
+extern void class_unregister(struct class *class);
+
+/* This is a #define to keep the compiler from merging different
+ * instances of the __key variable */
+#define class_register(class) \
+({ \
+ static struct lock_class_key __key; \
+ __class_register(class, &__key); \
+})
+
+struct class_compat;
+struct class_compat *class_compat_register(const char *name);
+void class_compat_unregister(struct class_compat *cls);
+int class_compat_create_link(struct class_compat *cls, struct device *dev,
+ struct device *device_link);
+void class_compat_remove_link(struct class_compat *cls, struct device *dev,
+ struct device *device_link);
+
+extern void class_dev_iter_init(struct class_dev_iter *iter,
+ struct class *class,
+ struct device *start,
+ const struct device_type *type);
+extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
+extern void class_dev_iter_exit(struct class_dev_iter *iter);
+
+extern int class_for_each_device(struct class *class, struct device *start,
+ void *data,
+ int (*fn)(struct device *dev, void *data));
+extern struct device *class_find_device(struct class *class,
+ struct device *start, const void *data,
+ int (*match)(struct device *, const void *));
+
+struct class_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct class *class, struct class_attribute *attr,
+ char *buf);
+ ssize_t (*store)(struct class *class, struct class_attribute *attr,
+ const char *buf, size_t count);
+};
+
+#define CLASS_ATTR_RW(_name) \
+ struct class_attribute class_attr_##_name = __ATTR_RW(_name)
+#define CLASS_ATTR_RO(_name) \
+ struct class_attribute class_attr_##_name = __ATTR_RO(_name)
+#define CLASS_ATTR_WO(_name) \
+ struct class_attribute class_attr_##_name = __ATTR_WO(_name)
+
+extern int __must_check class_create_file_ns(struct class *class,
+ const struct class_attribute *attr,
+ const void *ns);
+extern void class_remove_file_ns(struct class *class,
+ const struct class_attribute *attr,
+ const void *ns);
+
+static inline int __must_check class_create_file(struct class *class,
+ const struct class_attribute *attr)
+{
+ return class_create_file_ns(class, attr, NULL);
+}
+
+static inline void class_remove_file(struct class *class,
+ const struct class_attribute *attr)
+{
+ return class_remove_file_ns(class, attr, NULL);
+}
+
+/* Simple class attribute that is just a static string */
+struct class_attribute_string {
+ struct class_attribute attr;
+ char *str;
+};
+
+/* Currently read-only only */
+#define _CLASS_ATTR_STRING(_name, _mode, _str) \
+ { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
+#define CLASS_ATTR_STRING(_name, _mode, _str) \
+ struct class_attribute_string class_attr_##_name = \
+ _CLASS_ATTR_STRING(_name, _mode, _str)
+
+extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
+ char *buf);
+
+struct class_interface {
+ struct list_head node;
+ struct class *class;
+
+ int (*add_dev) (struct device *, struct class_interface *);
+ void (*remove_dev) (struct device *, struct class_interface *);
+};
+
+extern int __must_check class_interface_register(struct class_interface *);
+extern void class_interface_unregister(struct class_interface *);
+
+extern struct class * __must_check __class_create(struct module *owner,
+ const char *name,
+ struct lock_class_key *key);
+extern void class_destroy(struct class *cls);
+
+/* This is a #define to keep the compiler from merging different
+ * instances of the __key variable */
+#define class_create(owner, name) \
+({ \
+ static struct lock_class_key __key; \
+ __class_create(owner, name, &__key); \
+})
+
+/*
+ * The type of device, "struct device" is embedded in. A class
+ * or bus can contain devices of different types
+ * like "partitions" and "disks", "mouse" and "event".
+ * This identifies the device type and carries type-specific
+ * information, equivalent to the kobj_type of a kobject.
+ * If "name" is specified, the uevent will contain it in
+ * the DEVTYPE variable.
+ */
+struct device_type {
+ const char *name;
+ const struct attribute_group **groups;
+ int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
+ char *(*devnode)(struct device *dev, umode_t *mode,
+ kuid_t *uid, kgid_t *gid);
+ void (*release)(struct device *dev);
+
+ const struct dev_pm_ops *pm;
+};
+
+/* interface for exporting device attributes */
+struct device_attribute {
+ struct attribute attr;
+ ssize_t (*show)(struct device *dev, struct device_attribute *attr,
+ char *buf);
+ ssize_t (*store)(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count);
+};
+
+struct dev_ext_attribute {
+ struct device_attribute attr;
+ void *var;
+};
+
+ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
+ char *buf);
+ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count);
+ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
+ char *buf);
+ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count);
+ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
+ char *buf);
+ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count);
+
+#define DEVICE_ATTR(_name, _mode, _show, _store) \
+ struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
+#define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
+ struct device_attribute dev_attr_##_name = \
+ __ATTR_PREALLOC(_name, _mode, _show, _store)
+#define DEVICE_ATTR_RW(_name) \
+ struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
+#define DEVICE_ATTR_RO(_name) \
+ struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
+#define DEVICE_ATTR_WO(_name) \
+ struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
+#define DEVICE_ULONG_ATTR(_name, _mode, _var) \
+ struct dev_ext_attribute dev_attr_##_name = \
+ { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
+#define DEVICE_INT_ATTR(_name, _mode, _var) \
+ struct dev_ext_attribute dev_attr_##_name = \
+ { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
+#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
+ struct dev_ext_attribute dev_attr_##_name = \
+ { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
+#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
+ struct device_attribute dev_attr_##_name = \
+ __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
+
+extern int device_create_file(struct device *device,
+ const struct device_attribute *entry);
+extern void device_remove_file(struct device *dev,
+ const struct device_attribute *attr);
+extern bool device_remove_file_self(struct device *dev,
+ const struct device_attribute *attr);
+extern int __must_check device_create_bin_file(struct device *dev,
+ const struct bin_attribute *attr);
+extern void device_remove_bin_file(struct device *dev,
+ const struct bin_attribute *attr);
+
+/* device resource management */
+typedef void (*dr_release_t)(struct device *dev, void *res);
+typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
+
+#ifdef CONFIG_DEBUG_DEVRES
+extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
+ int nid, const char *name) __malloc;
+#define devres_alloc(release, size, gfp) \
+ __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
+#define devres_alloc_node(release, size, gfp, nid) \
+ __devres_alloc_node(release, size, gfp, nid, #release)
+#else
+extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
+ int nid) __malloc;
+static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
+{
+ return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
+}
+#endif
+
+extern void devres_for_each_res(struct device *dev, dr_release_t release,
+ dr_match_t match, void *match_data,
+ void (*fn)(struct device *, void *, void *),
+ void *data);
+extern void devres_free(void *res);
+extern void devres_add(struct device *dev, void *res);
+extern void *devres_find(struct device *dev, dr_release_t release,
+ dr_match_t match, void *match_data);
+extern void *devres_get(struct device *dev, void *new_res,
+ dr_match_t match, void *match_data);
+extern void *devres_remove(struct device *dev, dr_release_t release,
+ dr_match_t match, void *match_data);
+extern int devres_destroy(struct device *dev, dr_release_t release,
+ dr_match_t match, void *match_data);
+extern int devres_release(struct device *dev, dr_release_t release,
+ dr_match_t match, void *match_data);
+
+/* devres group */
+extern void * __must_check devres_open_group(struct device *dev, void *id,
+ gfp_t gfp);
+extern void devres_close_group(struct device *dev, void *id);
+extern void devres_remove_group(struct device *dev, void *id);
+extern int devres_release_group(struct device *dev, void *id);
+
+/* managed devm_k.alloc/kfree for device drivers */
+extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
+extern __printf(3, 0)
+char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
+ va_list ap) __malloc;
+extern __printf(3, 4)
+char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
+static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
+{
+ return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
+}
+static inline void *devm_kmalloc_array(struct device *dev,
+ size_t n, size_t size, gfp_t flags)
+{
+ size_t bytes;
+
+ if (unlikely(check_mul_overflow(n, size, &bytes)))
+ return NULL;
+
+ return devm_kmalloc(dev, bytes, flags);
+}
+static inline void *devm_kcalloc(struct device *dev,
+ size_t n, size_t size, gfp_t flags)
+{
+ return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
+}
+extern void devm_kfree(struct device *dev, void *p);
+extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
+extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
+ gfp_t gfp);
+
+extern unsigned long devm_get_free_pages(struct device *dev,
+ gfp_t gfp_mask, unsigned int order);
+extern void devm_free_pages(struct device *dev, unsigned long addr);
+
+void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
+
+void __iomem *devm_of_iomap(struct device *dev,
+ struct device_node *node, int index,
+ resource_size_t *size);
+
+/* allows to add/remove a custom action to devres stack */
+int devm_add_action(struct device *dev, void (*action)(void *), void *data);
+void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
+
+static inline int devm_add_action_or_reset(struct device *dev,
+ void (*action)(void *), void *data)
+{
+ int ret;
+
+ ret = devm_add_action(dev, action, data);
+ if (ret)
+ action(data);
+
+ return ret;
+}
+
+/**
+ * devm_alloc_percpu - Resource-managed alloc_percpu
+ * @dev: Device to allocate per-cpu memory for
+ * @type: Type to allocate per-cpu memory for
+ *
+ * Managed alloc_percpu. Per-cpu memory allocated with this function is
+ * automatically freed on driver detach.
+ *
+ * RETURNS:
+ * Pointer to allocated memory on success, NULL on failure.
+ */
+#define devm_alloc_percpu(dev, type) \
+ ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
+ __alignof__(type)))
+
+void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
+ size_t align);
+void devm_free_percpu(struct device *dev, void __percpu *pdata);
+
+struct device_dma_parameters {
+ /*
+ * a low level driver may set these to teach IOMMU code about
+ * sg limitations.
+ */
+ unsigned int max_segment_size;
+ unsigned long segment_boundary_mask;
+};
+
+/**
+ * struct device_connection - Device Connection Descriptor
+ * @endpoint: The names of the two devices connected together
+ * @id: Unique identifier for the connection
+ * @list: List head, private, for internal use only
+ */
+struct device_connection {
+ const char *endpoint[2];
+ const char *id;
+ struct list_head list;
+};
+
+void *device_connection_find_match(struct device *dev, const char *con_id,
+ void *data,
+ void *(*match)(struct device_connection *con,
+ int ep, void *data));
+
+struct device *device_connection_find(struct device *dev, const char *con_id);
+
+void device_connection_add(struct device_connection *con);
+void device_connection_remove(struct device_connection *con);
+
+/**
+ * enum device_link_state - Device link states.
+ * @DL_STATE_NONE: The presence of the drivers is not being tracked.
+ * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
+ * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
+ * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
+ * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
+ * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
+ */
+enum device_link_state {
+ DL_STATE_NONE = -1,
+ DL_STATE_DORMANT = 0,
+ DL_STATE_AVAILABLE,
+ DL_STATE_CONSUMER_PROBE,
+ DL_STATE_ACTIVE,
+ DL_STATE_SUPPLIER_UNBIND,
+};
+
+/*
+ * Device link flags.
+ *
+ * STATELESS: The core won't track the presence of supplier/consumer drivers.
+ * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
+ * PM_RUNTIME: If set, the runtime PM framework will use this link.
+ * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
+ * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
+ */
+#define DL_FLAG_STATELESS BIT(0)
+#define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
+#define DL_FLAG_PM_RUNTIME BIT(2)
+#define DL_FLAG_RPM_ACTIVE BIT(3)
+#define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
+
+/**
+ * struct device_link - Device link representation.
+ * @supplier: The device on the supplier end of the link.
+ * @s_node: Hook to the supplier device's list of links to consumers.
+ * @consumer: The device on the consumer end of the link.
+ * @c_node: Hook to the consumer device's list of links to suppliers.
+ * @status: The state of the link (with respect to the presence of drivers).
+ * @flags: Link flags.
+ * @rpm_active: Whether or not the consumer device is runtime-PM-active.
+ * @kref: Count repeated addition of the same link.
+ * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
+ */
+struct device_link {
+ struct device *supplier;
+ struct list_head s_node;
+ struct device *consumer;
+ struct list_head c_node;
+ enum device_link_state status;
+ u32 flags;
+ bool rpm_active;
+ struct kref kref;
+#ifdef CONFIG_SRCU
+ struct rcu_head rcu_head;
+#endif
+};
+
+/**
+ * enum dl_dev_state - Device driver presence tracking information.
+ * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
+ * @DL_DEV_PROBING: A driver is probing.
+ * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
+ * @DL_DEV_UNBINDING: The driver is unbinding from the device.
+ */
+enum dl_dev_state {
+ DL_DEV_NO_DRIVER = 0,
+ DL_DEV_PROBING,
+ DL_DEV_DRIVER_BOUND,
+ DL_DEV_UNBINDING,
+};
+
+/**
+ * struct dev_links_info - Device data related to device links.
+ * @suppliers: List of links to supplier devices.
+ * @consumers: List of links to consumer devices.
+ * @status: Driver status information.
+ */
+struct dev_links_info {
+ struct list_head suppliers;
+ struct list_head consumers;
+ enum dl_dev_state status;
+};
+
+/**
+ * struct device - The basic device structure
+ * @parent: The device's "parent" device, the device to which it is attached.
+ * In most cases, a parent device is some sort of bus or host
+ * controller. If parent is NULL, the device, is a top-level device,
+ * which is not usually what you want.
+ * @p: Holds the private data of the driver core portions of the device.
+ * See the comment of the struct device_private for detail.
+ * @kobj: A top-level, abstract class from which other classes are derived.
+ * @init_name: Initial name of the device.
+ * @type: The type of device.
+ * This identifies the device type and carries type-specific
+ * information.
+ * @mutex: Mutex to synchronize calls to its driver.
+ * @bus: Type of bus device is on.
+ * @driver: Which driver has allocated this
+ * @platform_data: Platform data specific to the device.
+ * Example: For devices on custom boards, as typical of embedded
+ * and SOC based hardware, Linux often uses platform_data to point
+ * to board-specific structures describing devices and how they
+ * are wired. That can include what ports are available, chip
+ * variants, which GPIO pins act in what additional roles, and so
+ * on. This shrinks the "Board Support Packages" (BSPs) and
+ * minimizes board-specific #ifdefs in drivers.
+ * @driver_data: Private pointer for driver specific info.
+ * @links: Links to suppliers and consumers of this device.
+ * @power: For device power management.
+ * See Documentation/driver-api/pm/devices.rst for details.
+ * @pm_domain: Provide callbacks that are executed during system suspend,
+ * hibernation, system resume and during runtime PM transitions
+ * along with subsystem-level and driver-level callbacks.
+ * @pins: For device pin management.
+ * See Documentation/driver-api/pinctl.rst for details.
+ * @msi_list: Hosts MSI descriptors
+ * @msi_domain: The generic MSI domain this device is using.
+ * @numa_node: NUMA node this device is close to.
+ * @dma_ops: DMA mapping operations for this device.
+ * @dma_mask: Dma mask (if dma'ble device).
+ * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
+ * hardware supports 64-bit addresses for consistent allocations
+ * such descriptors.
+ * @bus_dma_mask: Mask of an upstream bridge or bus which imposes a smaller DMA
+ * limit than the device itself supports.
+ * @dma_pfn_offset: offset of DMA memory range relatively of RAM
+ * @dma_parms: A low level driver may set these to teach IOMMU code about
+ * segment limitations.
+ * @dma_pools: Dma pools (if dma'ble device).
+ * @dma_mem: Internal for coherent mem override.
+ * @cma_area: Contiguous memory area for dma allocations
+ * @archdata: For arch-specific additions.
+ * @of_node: Associated device tree node.
+ * @fwnode: Associated device node supplied by platform firmware.
+ * @devt: For creating the sysfs "dev".
+ * @id: device instance
+ * @devres_lock: Spinlock to protect the resource of the device.
+ * @devres_head: The resources list of the device.
+ * @knode_class: The node used to add the device to the class list.
+ * @class: The class of the device.
+ * @groups: Optional attribute groups.
+ * @release: Callback to free the device after all references have
+ * gone away. This should be set by the allocator of the
+ * device (i.e. the bus driver that discovered the device).
+ * @iommu_group: IOMMU group the device belongs to.
+ * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
+ *
+ * @offline_disabled: If set, the device is permanently online.
+ * @offline: Set after successful invocation of bus type's .offline().
+ * @of_node_reused: Set if the device-tree node is shared with an ancestor
+ * device.
+ *
+ * At the lowest level, every device in a Linux system is represented by an
+ * instance of struct device. The device structure contains the information
+ * that the device model core needs to model the system. Most subsystems,
+ * however, track additional information about the devices they host. As a
+ * result, it is rare for devices to be represented by bare device structures;
+ * instead, that structure, like kobject structures, is usually embedded within
+ * a higher-level representation of the device.
+ */
+struct device {
+ struct device *parent;
+
+ struct device_private *p;
+
+ struct kobject kobj;
+ const char *init_name; /* initial name of the device */
+ const struct device_type *type;
+
+ struct mutex mutex; /* mutex to synchronize calls to
+ * its driver.
+ */
+
+ struct bus_type *bus; /* type of bus device is on */
+ struct device_driver *driver; /* which driver has allocated this
+ device */
+ void *platform_data; /* Platform specific data, device
+ core doesn't touch it */
+ void *driver_data; /* Driver data, set and get with
+ dev_set/get_drvdata */
+ struct dev_links_info links;
+ struct dev_pm_info power;
+ struct dev_pm_domain *pm_domain;
+
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+ struct irq_domain *msi_domain;
+#endif
+#ifdef CONFIG_PINCTRL
+ struct dev_pin_info *pins;
+#endif
+#ifdef CONFIG_GENERIC_MSI_IRQ
+ struct list_head msi_list;
+#endif
+
+#ifdef CONFIG_NUMA
+ int numa_node; /* NUMA node this device is close to */
+#endif
+ const struct dma_map_ops *dma_ops;
+ u64 *dma_mask; /* dma mask (if dma'able device) */
+ u64 coherent_dma_mask;/* Like dma_mask, but for
+ alloc_coherent mappings as
+ not all hardware supports
+ 64 bit addresses for consistent
+ allocations such descriptors. */
+ u64 bus_dma_mask; /* upstream dma_mask constraint */
+ unsigned long dma_pfn_offset;
+
+ struct device_dma_parameters *dma_parms;
+
+ struct list_head dma_pools; /* dma pools (if dma'ble) */
+
+ struct dma_coherent_mem *dma_mem; /* internal for coherent mem
+ override */
+#ifdef CONFIG_DMA_CMA
+ struct cma *cma_area; /* contiguous memory area for dma
+ allocations */
+#endif
+ /* arch specific additions */
+ struct dev_archdata archdata;
+
+ struct device_node *of_node; /* associated device tree node */
+ struct fwnode_handle *fwnode; /* firmware device node */
+
+ dev_t devt; /* dev_t, creates the sysfs "dev" */
+ u32 id; /* device instance */
+
+ spinlock_t devres_lock;
+ struct list_head devres_head;
+
+ struct klist_node knode_class;
+ struct class *class;
+ const struct attribute_group **groups; /* optional groups */
+
+ void (*release)(struct device *dev);
+ struct iommu_group *iommu_group;
+ struct iommu_fwspec *iommu_fwspec;
+
+ bool offline_disabled:1;
+ bool offline:1;
+ bool of_node_reused:1;
+};
+
+static inline struct device *kobj_to_dev(struct kobject *kobj)
+{
+ return container_of(kobj, struct device, kobj);
+}
+
+/* Get the wakeup routines, which depend on struct device */
+#include <linux/pm_wakeup.h>
+
+static inline const char *dev_name(const struct device *dev)
+{
+ /* Use the init name until the kobject becomes available */
+ if (dev->init_name)
+ return dev->init_name;
+
+ return kobject_name(&dev->kobj);
+}
+
+extern __printf(2, 3)
+int dev_set_name(struct device *dev, const char *name, ...);
+
+#ifdef CONFIG_NUMA
+static inline int dev_to_node(struct device *dev)
+{
+ return dev->numa_node;
+}
+static inline void set_dev_node(struct device *dev, int node)
+{
+ dev->numa_node = node;
+}
+#else
+static inline int dev_to_node(struct device *dev)
+{
+ return -1;
+}
+static inline void set_dev_node(struct device *dev, int node)
+{
+}
+#endif
+
+static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
+{
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+ return dev->msi_domain;
+#else
+ return NULL;
+#endif
+}
+
+static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
+{
+#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
+ dev->msi_domain = d;
+#endif
+}
+
+static inline void *dev_get_drvdata(const struct device *dev)
+{
+ return dev->driver_data;
+}
+
+static inline void dev_set_drvdata(struct device *dev, void *data)
+{
+ dev->driver_data = data;
+}
+
+static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
+{
+ return dev ? dev->power.subsys_data : NULL;
+}
+
+static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
+{
+ return dev->kobj.uevent_suppress;
+}
+
+static inline void dev_set_uevent_suppress(struct device *dev, int val)
+{
+ dev->kobj.uevent_suppress = val;
+}
+
+static inline int device_is_registered(struct device *dev)
+{
+ return dev->kobj.state_in_sysfs;
+}
+
+static inline void device_enable_async_suspend(struct device *dev)
+{
+ if (!dev->power.is_prepared)
+ dev->power.async_suspend = true;
+}
+
+static inline void device_disable_async_suspend(struct device *dev)
+{
+ if (!dev->power.is_prepared)
+ dev->power.async_suspend = false;
+}
+
+static inline bool device_async_suspend_enabled(struct device *dev)
+{
+ return !!dev->power.async_suspend;
+}
+
+static inline void dev_pm_syscore_device(struct device *dev, bool val)
+{
+#ifdef CONFIG_PM_SLEEP
+ dev->power.syscore = val;
+#endif
+}
+
+static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
+{
+ dev->power.driver_flags = flags;
+}
+
+static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
+{
+ return !!(dev->power.driver_flags & flags);
+}
+
+static inline void device_lock(struct device *dev)
+{
+ mutex_lock(&dev->mutex);
+}
+
+static inline int device_lock_interruptible(struct device *dev)
+{
+ return mutex_lock_interruptible(&dev->mutex);
+}
+
+static inline int device_trylock(struct device *dev)
+{
+ return mutex_trylock(&dev->mutex);
+}
+
+static inline void device_unlock(struct device *dev)
+{
+ mutex_unlock(&dev->mutex);
+}
+
+static inline void device_lock_assert(struct device *dev)
+{
+ lockdep_assert_held(&dev->mutex);
+}
+
+static inline struct device_node *dev_of_node(struct device *dev)
+{
+ if (!IS_ENABLED(CONFIG_OF))
+ return NULL;
+ return dev->of_node;
+}
+
+void driver_init(void);
+
+/*
+ * High level routines for use by the bus drivers
+ */
+extern int __must_check device_register(struct device *dev);
+extern void device_unregister(struct device *dev);
+extern void device_initialize(struct device *dev);
+extern int __must_check device_add(struct device *dev);
+extern void device_del(struct device *dev);
+extern int device_for_each_child(struct device *dev, void *data,
+ int (*fn)(struct device *dev, void *data));
+extern int device_for_each_child_reverse(struct device *dev, void *data,
+ int (*fn)(struct device *dev, void *data));
+extern struct device *device_find_child(struct device *dev, void *data,
+ int (*match)(struct device *dev, void *data));
+extern int device_rename(struct device *dev, const char *new_name);
+extern int device_move(struct device *dev, struct device *new_parent,
+ enum dpm_order dpm_order);
+extern const char *device_get_devnode(struct device *dev,
+ umode_t *mode, kuid_t *uid, kgid_t *gid,
+ const char **tmp);
+
+static inline bool device_supports_offline(struct device *dev)
+{
+ return dev->bus && dev->bus->offline && dev->bus->online;
+}
+
+extern void lock_device_hotplug(void);
+extern void unlock_device_hotplug(void);
+extern int lock_device_hotplug_sysfs(void);
+extern int device_offline(struct device *dev);
+extern int device_online(struct device *dev);
+extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
+extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
+void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
+
+static inline int dev_num_vf(struct device *dev)
+{
+ if (dev->bus && dev->bus->num_vf)
+ return dev->bus->num_vf(dev);
+ return 0;
+}
+
+/*
+ * Root device objects for grouping under /sys/devices
+ */
+extern struct device *__root_device_register(const char *name,
+ struct module *owner);
+
+/* This is a macro to avoid include problems with THIS_MODULE */
+#define root_device_register(name) \
+ __root_device_register(name, THIS_MODULE)
+
+extern void root_device_unregister(struct device *root);
+
+static inline void *dev_get_platdata(const struct device *dev)
+{
+ return dev->platform_data;
+}
+
+/*
+ * Manual binding of a device to driver. See drivers/base/bus.c
+ * for information on use.
+ */
+extern int __must_check device_bind_driver(struct device *dev);
+extern void device_release_driver(struct device *dev);
+extern int __must_check device_attach(struct device *dev);
+extern int __must_check driver_attach(struct device_driver *drv);
+extern void device_initial_probe(struct device *dev);
+extern int __must_check device_reprobe(struct device *dev);
+
+extern bool device_is_bound(struct device *dev);
+
+/*
+ * Easy functions for dynamically creating devices on the fly
+ */
+extern __printf(5, 0)
+struct device *device_create_vargs(struct class *cls, struct device *parent,
+ dev_t devt, void *drvdata,
+ const char *fmt, va_list vargs);
+extern __printf(5, 6)
+struct device *device_create(struct class *cls, struct device *parent,
+ dev_t devt, void *drvdata,
+ const char *fmt, ...);
+extern __printf(6, 7)
+struct device *device_create_with_groups(struct class *cls,
+ struct device *parent, dev_t devt, void *drvdata,
+ const struct attribute_group **groups,
+ const char *fmt, ...);
+extern void device_destroy(struct class *cls, dev_t devt);
+
+extern int __must_check device_add_groups(struct device *dev,
+ const struct attribute_group **groups);
+extern void device_remove_groups(struct device *dev,
+ const struct attribute_group **groups);
+
+static inline int __must_check device_add_group(struct device *dev,
+ const struct attribute_group *grp)
+{
+ const struct attribute_group *groups[] = { grp, NULL };
+
+ return device_add_groups(dev, groups);
+}
+
+static inline void device_remove_group(struct device *dev,
+ const struct attribute_group *grp)
+{
+ const struct attribute_group *groups[] = { grp, NULL };
+
+ return device_remove_groups(dev, groups);
+}
+
+extern int __must_check devm_device_add_groups(struct device *dev,
+ const struct attribute_group **groups);
+extern void devm_device_remove_groups(struct device *dev,
+ const struct attribute_group **groups);
+extern int __must_check devm_device_add_group(struct device *dev,
+ const struct attribute_group *grp);
+extern void devm_device_remove_group(struct device *dev,
+ const struct attribute_group *grp);
+
+/*
+ * Platform "fixup" functions - allow the platform to have their say
+ * about devices and actions that the general device layer doesn't
+ * know about.
+ */
+/* Notify platform of device discovery */
+extern int (*platform_notify)(struct device *dev);
+
+extern int (*platform_notify_remove)(struct device *dev);
+
+
+/*
+ * get_device - atomically increment the reference count for the device.
+ *
+ */
+extern struct device *get_device(struct device *dev);
+extern void put_device(struct device *dev);
+
+#ifdef CONFIG_DEVTMPFS
+extern int devtmpfs_create_node(struct device *dev);
+extern int devtmpfs_delete_node(struct device *dev);
+extern int devtmpfs_mount(const char *mntdir);
+#else
+static inline int devtmpfs_create_node(struct device *dev) { return 0; }
+static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
+static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
+#endif
+
+/* drivers/base/power/shutdown.c */
+extern void device_shutdown(void);
+
+/* debugging and troubleshooting/diagnostic helpers. */
+extern const char *dev_driver_string(const struct device *dev);
+
+/* Device links interface. */
+struct device_link *device_link_add(struct device *consumer,
+ struct device *supplier, u32 flags);
+void device_link_del(struct device_link *link);
+void device_link_remove(void *consumer, struct device *supplier);
+
+#ifndef dev_fmt
+#define dev_fmt(fmt) fmt
+#endif
+
+#ifdef CONFIG_PRINTK
+
+__printf(3, 0)
+int dev_vprintk_emit(int level, const struct device *dev,
+ const char *fmt, va_list args);
+__printf(3, 4)
+int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
+
+__printf(3, 4)
+void dev_printk(const char *level, const struct device *dev,
+ const char *fmt, ...);
+__printf(2, 3)
+void _dev_emerg(const struct device *dev, const char *fmt, ...);
+__printf(2, 3)
+void _dev_alert(const struct device *dev, const char *fmt, ...);
+__printf(2, 3)
+void _dev_crit(const struct device *dev, const char *fmt, ...);
+__printf(2, 3)
+void _dev_err(const struct device *dev, const char *fmt, ...);
+__printf(2, 3)
+void _dev_warn(const struct device *dev, const char *fmt, ...);
+__printf(2, 3)
+void _dev_notice(const struct device *dev, const char *fmt, ...);
+__printf(2, 3)
+void _dev_info(const struct device *dev, const char *fmt, ...);
+
+#else
+
+static inline __printf(3, 0)
+int dev_vprintk_emit(int level, const struct device *dev,
+ const char *fmt, va_list args)
+{ return 0; }
+static inline __printf(3, 4)
+int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
+{ return 0; }
+
+static inline void __dev_printk(const char *level, const struct device *dev,
+ struct va_format *vaf)
+{}
+static inline __printf(3, 4)
+void dev_printk(const char *level, const struct device *dev,
+ const char *fmt, ...)
+{}
+
+static inline __printf(2, 3)
+void _dev_emerg(const struct device *dev, const char *fmt, ...)
+{}
+static inline __printf(2, 3)
+void _dev_crit(const struct device *dev, const char *fmt, ...)
+{}
+static inline __printf(2, 3)
+void _dev_alert(const struct device *dev, const char *fmt, ...)
+{}
+static inline __printf(2, 3)
+void _dev_err(const struct device *dev, const char *fmt, ...)
+{}
+static inline __printf(2, 3)
+void _dev_warn(const struct device *dev, const char *fmt, ...)
+{}
+static inline __printf(2, 3)
+void _dev_notice(const struct device *dev, const char *fmt, ...)
+{}
+static inline __printf(2, 3)
+void _dev_info(const struct device *dev, const char *fmt, ...)
+{}
+
+#endif
+
+/*
+ * #defines for all the dev_<level> macros to prefix with whatever
+ * possible use of #define dev_fmt(fmt) ...
+ */
+
+#define dev_emerg(dev, fmt, ...) \
+ _dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__)
+#define dev_crit(dev, fmt, ...) \
+ _dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__)
+#define dev_alert(dev, fmt, ...) \
+ _dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__)
+#define dev_err(dev, fmt, ...) \
+ _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
+#define dev_warn(dev, fmt, ...) \
+ _dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__)
+#define dev_notice(dev, fmt, ...) \
+ _dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__)
+#define dev_info(dev, fmt, ...) \
+ _dev_info(dev, dev_fmt(fmt), ##__VA_ARGS__)
+
+#if defined(CONFIG_DYNAMIC_DEBUG)
+#define dev_dbg(dev, fmt, ...) \
+ dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
+#elif defined(DEBUG)
+#define dev_dbg(dev, fmt, ...) \
+ dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
+#else
+#define dev_dbg(dev, fmt, ...) \
+({ \
+ if (0) \
+ dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
+})
+#endif
+
+#ifdef CONFIG_PRINTK
+#define dev_level_once(dev_level, dev, fmt, ...) \
+do { \
+ static bool __print_once __read_mostly; \
+ \
+ if (!__print_once) { \
+ __print_once = true; \
+ dev_level(dev, fmt, ##__VA_ARGS__); \
+ } \
+} while (0)
+#else
+#define dev_level_once(dev_level, dev, fmt, ...) \
+do { \
+ if (0) \
+ dev_level(dev, fmt, ##__VA_ARGS__); \
+} while (0)
+#endif
+
+#define dev_emerg_once(dev, fmt, ...) \
+ dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
+#define dev_alert_once(dev, fmt, ...) \
+ dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
+#define dev_crit_once(dev, fmt, ...) \
+ dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
+#define dev_err_once(dev, fmt, ...) \
+ dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
+#define dev_warn_once(dev, fmt, ...) \
+ dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
+#define dev_notice_once(dev, fmt, ...) \
+ dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
+#define dev_info_once(dev, fmt, ...) \
+ dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
+#define dev_dbg_once(dev, fmt, ...) \
+ dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
+
+#define dev_level_ratelimited(dev_level, dev, fmt, ...) \
+do { \
+ static DEFINE_RATELIMIT_STATE(_rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ if (__ratelimit(&_rs)) \
+ dev_level(dev, fmt, ##__VA_ARGS__); \
+} while (0)
+
+#define dev_emerg_ratelimited(dev, fmt, ...) \
+ dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
+#define dev_alert_ratelimited(dev, fmt, ...) \
+ dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
+#define dev_crit_ratelimited(dev, fmt, ...) \
+ dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
+#define dev_err_ratelimited(dev, fmt, ...) \
+ dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
+#define dev_warn_ratelimited(dev, fmt, ...) \
+ dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
+#define dev_notice_ratelimited(dev, fmt, ...) \
+ dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
+#define dev_info_ratelimited(dev, fmt, ...) \
+ dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
+#if defined(CONFIG_DYNAMIC_DEBUG)
+/* descriptor check is first to prevent flooding with "callbacks suppressed" */
+#define dev_dbg_ratelimited(dev, fmt, ...) \
+do { \
+ static DEFINE_RATELIMIT_STATE(_rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
+ if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
+ __ratelimit(&_rs)) \
+ __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \
+ ##__VA_ARGS__); \
+} while (0)
+#elif defined(DEBUG)
+#define dev_dbg_ratelimited(dev, fmt, ...) \
+do { \
+ static DEFINE_RATELIMIT_STATE(_rs, \
+ DEFAULT_RATELIMIT_INTERVAL, \
+ DEFAULT_RATELIMIT_BURST); \
+ if (__ratelimit(&_rs)) \
+ dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
+} while (0)
+#else
+#define dev_dbg_ratelimited(dev, fmt, ...) \
+do { \
+ if (0) \
+ dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
+} while (0)
+#endif
+
+#ifdef VERBOSE_DEBUG
+#define dev_vdbg dev_dbg
+#else
+#define dev_vdbg(dev, fmt, ...) \
+({ \
+ if (0) \
+ dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
+})
+#endif
+
+/*
+ * dev_WARN*() acts like dev_printk(), but with the key difference of
+ * using WARN/WARN_ONCE to include file/line information and a backtrace.
+ */
+#define dev_WARN(dev, format, arg...) \
+ WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
+
+#define dev_WARN_ONCE(dev, condition, format, arg...) \
+ WARN_ONCE(condition, "%s %s: " format, \
+ dev_driver_string(dev), dev_name(dev), ## arg)
+
+/* Create alias, so I can be autoloaded. */
+#define MODULE_ALIAS_CHARDEV(major,minor) \
+ MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
+#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
+ MODULE_ALIAS("char-major-" __stringify(major) "-*")
+
+#ifdef CONFIG_SYSFS_DEPRECATED
+extern long sysfs_deprecated;
+#else
+#define sysfs_deprecated 0
+#endif
+
+/**
+ * module_driver() - Helper macro for drivers that don't do anything
+ * special in module init/exit. This eliminates a lot of boilerplate.
+ * Each module may only use this macro once, and calling it replaces
+ * module_init() and module_exit().
+ *
+ * @__driver: driver name
+ * @__register: register function for this driver type
+ * @__unregister: unregister function for this driver type
+ * @...: Additional arguments to be passed to __register and __unregister.
+ *
+ * Use this macro to construct bus specific macros for registering
+ * drivers, and do not use it on its own.
+ */
+#define module_driver(__driver, __register, __unregister, ...) \
+static int __init __driver##_init(void) \
+{ \
+ return __register(&(__driver) , ##__VA_ARGS__); \
+} \
+module_init(__driver##_init); \
+static void __exit __driver##_exit(void) \
+{ \
+ __unregister(&(__driver) , ##__VA_ARGS__); \
+} \
+module_exit(__driver##_exit);
+
+/**
+ * builtin_driver() - Helper macro for drivers that don't do anything
+ * special in init and have no exit. This eliminates some boilerplate.
+ * Each driver may only use this macro once, and calling it replaces
+ * device_initcall (or in some cases, the legacy __initcall). This is
+ * meant to be a direct parallel of module_driver() above but without
+ * the __exit stuff that is not used for builtin cases.
+ *
+ * @__driver: driver name
+ * @__register: register function for this driver type
+ * @...: Additional arguments to be passed to __register
+ *
+ * Use this macro to construct bus specific macros for registering
+ * drivers, and do not use it on its own.
+ */
+#define builtin_driver(__driver, __register, ...) \
+static int __init __driver##_init(void) \
+{ \
+ return __register(&(__driver) , ##__VA_ARGS__); \
+} \
+device_initcall(__driver##_init);
+
+#endif /* _DEVICE_H_ */