linux/include/linux/device.h
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   1/*
   2 * device.h - generic, centralized driver model
   3 *
   4 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
   5 * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
   6 * Copyright (c) 2008-2009 Novell Inc.
   7 *
   8 * This file is released under the GPLv2
   9 *
  10 * See Documentation/driver-model/ for more information.
  11 */
  12
  13#ifndef _DEVICE_H_
  14#define _DEVICE_H_
  15
  16#include <linux/ioport.h>
  17#include <linux/kobject.h>
  18#include <linux/klist.h>
  19#include <linux/list.h>
  20#include <linux/lockdep.h>
  21#include <linux/compiler.h>
  22#include <linux/types.h>
  23#include <linux/mutex.h>
  24#include <linux/pinctrl/devinfo.h>
  25#include <linux/pm.h>
  26#include <linux/atomic.h>
  27#include <linux/ratelimit.h>
  28#include <linux/uidgid.h>
  29#include <linux/gfp.h>
  30#include <asm/device.h>
  31
  32struct device;
  33struct device_private;
  34struct device_driver;
  35struct driver_private;
  36struct module;
  37struct class;
  38struct subsys_private;
  39struct bus_type;
  40struct device_node;
  41struct iommu_ops;
  42struct iommu_group;
  43
  44struct bus_attribute {
  45        struct attribute        attr;
  46        ssize_t (*show)(struct bus_type *bus, char *buf);
  47        ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  48};
  49
  50#define BUS_ATTR(_name, _mode, _show, _store)   \
  51        struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  52#define BUS_ATTR_RW(_name) \
  53        struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
  54#define BUS_ATTR_RO(_name) \
  55        struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
  56
  57extern int __must_check bus_create_file(struct bus_type *,
  58                                        struct bus_attribute *);
  59extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  60
  61/**
  62 * struct bus_type - The bus type of the device
  63 *
  64 * @name:       The name of the bus.
  65 * @dev_name:   Used for subsystems to enumerate devices like ("foo%u", dev->id).
  66 * @dev_root:   Default device to use as the parent.
  67 * @dev_attrs:  Default attributes of the devices on the bus.
  68 * @bus_groups: Default attributes of the bus.
  69 * @dev_groups: Default attributes of the devices on the bus.
  70 * @drv_groups: Default attributes of the device drivers on the bus.
  71 * @match:      Called, perhaps multiple times, whenever a new device or driver
  72 *              is added for this bus. It should return a nonzero value if the
  73 *              given device can be handled by the given driver.
  74 * @uevent:     Called when a device is added, removed, or a few other things
  75 *              that generate uevents to add the environment variables.
  76 * @probe:      Called when a new device or driver add to this bus, and callback
  77 *              the specific driver's probe to initial the matched device.
  78 * @remove:     Called when a device removed from this bus.
  79 * @shutdown:   Called at shut-down time to quiesce the device.
  80 *
  81 * @online:     Called to put the device back online (after offlining it).
  82 * @offline:    Called to put the device offline for hot-removal. May fail.
  83 *
  84 * @suspend:    Called when a device on this bus wants to go to sleep mode.
  85 * @resume:     Called to bring a device on this bus out of sleep mode.
  86 * @pm:         Power management operations of this bus, callback the specific
  87 *              device driver's pm-ops.
  88 * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
  89 *              driver implementations to a bus and allow the driver to do
  90 *              bus-specific setup
  91 * @p:          The private data of the driver core, only the driver core can
  92 *              touch this.
  93 * @lock_key:   Lock class key for use by the lock validator
  94 *
  95 * A bus is a channel between the processor and one or more devices. For the
  96 * purposes of the device model, all devices are connected via a bus, even if
  97 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
  98 * A USB controller is usually a PCI device, for example. The device model
  99 * represents the actual connections between buses and the devices they control.
 100 * A bus is represented by the bus_type structure. It contains the name, the
 101 * default attributes, the bus' methods, PM operations, and the driver core's
 102 * private data.
 103 */
 104struct bus_type {
 105        const char              *name;
 106        const char              *dev_name;
 107        struct device           *dev_root;
 108        struct device_attribute *dev_attrs;     /* use dev_groups instead */
 109        const struct attribute_group **bus_groups;
 110        const struct attribute_group **dev_groups;
 111        const struct attribute_group **drv_groups;
 112
 113        int (*match)(struct device *dev, struct device_driver *drv);
 114        int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 115        int (*probe)(struct device *dev);
 116        int (*remove)(struct device *dev);
 117        void (*shutdown)(struct device *dev);
 118
 119        int (*online)(struct device *dev);
 120        int (*offline)(struct device *dev);
 121
 122        int (*suspend)(struct device *dev, pm_message_t state);
 123        int (*resume)(struct device *dev);
 124
 125        const struct dev_pm_ops *pm;
 126
 127        struct iommu_ops *iommu_ops;
 128
 129        struct subsys_private *p;
 130        struct lock_class_key lock_key;
 131};
 132
 133extern int __must_check bus_register(struct bus_type *bus);
 134
 135extern void bus_unregister(struct bus_type *bus);
 136
 137extern int __must_check bus_rescan_devices(struct bus_type *bus);
 138
 139/* iterator helpers for buses */
 140struct subsys_dev_iter {
 141        struct klist_iter               ki;
 142        const struct device_type        *type;
 143};
 144void subsys_dev_iter_init(struct subsys_dev_iter *iter,
 145                         struct bus_type *subsys,
 146                         struct device *start,
 147                         const struct device_type *type);
 148struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
 149void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
 150
 151int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 152                     int (*fn)(struct device *dev, void *data));
 153struct device *bus_find_device(struct bus_type *bus, struct device *start,
 154                               void *data,
 155                               int (*match)(struct device *dev, void *data));
 156struct device *bus_find_device_by_name(struct bus_type *bus,
 157                                       struct device *start,
 158                                       const char *name);
 159struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
 160                                        struct device *hint);
 161int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
 162                     void *data, int (*fn)(struct device_driver *, void *));
 163void bus_sort_breadthfirst(struct bus_type *bus,
 164                           int (*compare)(const struct device *a,
 165                                          const struct device *b));
 166/*
 167 * Bus notifiers: Get notified of addition/removal of devices
 168 * and binding/unbinding of drivers to devices.
 169 * In the long run, it should be a replacement for the platform
 170 * notify hooks.
 171 */
 172struct notifier_block;
 173
 174extern int bus_register_notifier(struct bus_type *bus,
 175                                 struct notifier_block *nb);
 176extern int bus_unregister_notifier(struct bus_type *bus,
 177                                   struct notifier_block *nb);
 178
 179/* All 4 notifers below get called with the target struct device *
 180 * as an argument. Note that those functions are likely to be called
 181 * with the device lock held in the core, so be careful.
 182 */
 183#define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 184#define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 185#define BUS_NOTIFY_BIND_DRIVER          0x00000003 /* driver about to be
 186                                                      bound */
 187#define BUS_NOTIFY_BOUND_DRIVER         0x00000004 /* driver bound to device */
 188#define BUS_NOTIFY_UNBIND_DRIVER        0x00000005 /* driver about to be
 189                                                      unbound */
 190#define BUS_NOTIFY_UNBOUND_DRIVER       0x00000006 /* driver is unbound
 191                                                      from the device */
 192
 193extern struct kset *bus_get_kset(struct bus_type *bus);
 194extern struct klist *bus_get_device_klist(struct bus_type *bus);
 195
 196/**
 197 * struct device_driver - The basic device driver structure
 198 * @name:       Name of the device driver.
 199 * @bus:        The bus which the device of this driver belongs to.
 200 * @owner:      The module owner.
 201 * @mod_name:   Used for built-in modules.
 202 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
 203 * @of_match_table: The open firmware table.
 204 * @acpi_match_table: The ACPI match table.
 205 * @probe:      Called to query the existence of a specific device,
 206 *              whether this driver can work with it, and bind the driver
 207 *              to a specific device.
 208 * @remove:     Called when the device is removed from the system to
 209 *              unbind a device from this driver.
 210 * @shutdown:   Called at shut-down time to quiesce the device.
 211 * @suspend:    Called to put the device to sleep mode. Usually to a
 212 *              low power state.
 213 * @resume:     Called to bring a device from sleep mode.
 214 * @groups:     Default attributes that get created by the driver core
 215 *              automatically.
 216 * @pm:         Power management operations of the device which matched
 217 *              this driver.
 218 * @p:          Driver core's private data, no one other than the driver
 219 *              core can touch this.
 220 *
 221 * The device driver-model tracks all of the drivers known to the system.
 222 * The main reason for this tracking is to enable the driver core to match
 223 * up drivers with new devices. Once drivers are known objects within the
 224 * system, however, a number of other things become possible. Device drivers
 225 * can export information and configuration variables that are independent
 226 * of any specific device.
 227 */
 228struct device_driver {
 229        const char              *name;
 230        struct bus_type         *bus;
 231
 232        struct module           *owner;
 233        const char              *mod_name;      /* used for built-in modules */
 234
 235        bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
 236
 237        const struct of_device_id       *of_match_table;
 238        const struct acpi_device_id     *acpi_match_table;
 239
 240        int (*probe) (struct device *dev);
 241        int (*remove) (struct device *dev);
 242        void (*shutdown) (struct device *dev);
 243        int (*suspend) (struct device *dev, pm_message_t state);
 244        int (*resume) (struct device *dev);
 245        const struct attribute_group **groups;
 246
 247        const struct dev_pm_ops *pm;
 248
 249        struct driver_private *p;
 250};
 251
 252
 253extern int __must_check driver_register(struct device_driver *drv);
 254extern void driver_unregister(struct device_driver *drv);
 255
 256extern struct device_driver *driver_find(const char *name,
 257                                         struct bus_type *bus);
 258extern int driver_probe_done(void);
 259extern void wait_for_device_probe(void);
 260
 261
 262/* sysfs interface for exporting driver attributes */
 263
 264struct driver_attribute {
 265        struct attribute attr;
 266        ssize_t (*show)(struct device_driver *driver, char *buf);
 267        ssize_t (*store)(struct device_driver *driver, const char *buf,
 268                         size_t count);
 269};
 270
 271#define DRIVER_ATTR(_name, _mode, _show, _store) \
 272        struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
 273#define DRIVER_ATTR_RW(_name) \
 274        struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
 275#define DRIVER_ATTR_RO(_name) \
 276        struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
 277#define DRIVER_ATTR_WO(_name) \
 278        struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
 279
 280extern int __must_check driver_create_file(struct device_driver *driver,
 281                                        const struct driver_attribute *attr);
 282extern void driver_remove_file(struct device_driver *driver,
 283                               const struct driver_attribute *attr);
 284
 285extern int __must_check driver_for_each_device(struct device_driver *drv,
 286                                               struct device *start,
 287                                               void *data,
 288                                               int (*fn)(struct device *dev,
 289                                                         void *));
 290struct device *driver_find_device(struct device_driver *drv,
 291                                  struct device *start, void *data,
 292                                  int (*match)(struct device *dev, void *data));
 293
 294/**
 295 * struct subsys_interface - interfaces to device functions
 296 * @name:       name of the device function
 297 * @subsys:     subsytem of the devices to attach to
 298 * @node:       the list of functions registered at the subsystem
 299 * @add_dev:    device hookup to device function handler
 300 * @remove_dev: device hookup to device function handler
 301 *
 302 * Simple interfaces attached to a subsystem. Multiple interfaces can
 303 * attach to a subsystem and its devices. Unlike drivers, they do not
 304 * exclusively claim or control devices. Interfaces usually represent
 305 * a specific functionality of a subsystem/class of devices.
 306 */
 307struct subsys_interface {
 308        const char *name;
 309        struct bus_type *subsys;
 310        struct list_head node;
 311        int (*add_dev)(struct device *dev, struct subsys_interface *sif);
 312        int (*remove_dev)(struct device *dev, struct subsys_interface *sif);
 313};
 314
 315int subsys_interface_register(struct subsys_interface *sif);
 316void subsys_interface_unregister(struct subsys_interface *sif);
 317
 318int subsys_system_register(struct bus_type *subsys,
 319                           const struct attribute_group **groups);
 320int subsys_virtual_register(struct bus_type *subsys,
 321                            const struct attribute_group **groups);
 322
 323/**
 324 * struct class - device classes
 325 * @name:       Name of the class.
 326 * @owner:      The module owner.
 327 * @class_attrs: Default attributes of this class.
 328 * @dev_groups: Default attributes of the devices that belong to the class.
 329 * @dev_kobj:   The kobject that represents this class and links it into the hierarchy.
 330 * @dev_uevent: Called when a device is added, removed from this class, or a
 331 *              few other things that generate uevents to add the environment
 332 *              variables.
 333 * @devnode:    Callback to provide the devtmpfs.
 334 * @class_release: Called to release this class.
 335 * @dev_release: Called to release the device.
 336 * @suspend:    Used to put the device to sleep mode, usually to a low power
 337 *              state.
 338 * @resume:     Used to bring the device from the sleep mode.
 339 * @ns_type:    Callbacks so sysfs can detemine namespaces.
 340 * @namespace:  Namespace of the device belongs to this class.
 341 * @pm:         The default device power management operations of this class.
 342 * @p:          The private data of the driver core, no one other than the
 343 *              driver core can touch this.
 344 *
 345 * A class is a higher-level view of a device that abstracts out low-level
 346 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
 347 * at the class level, they are all simply disks. Classes allow user space
 348 * to work with devices based on what they do, rather than how they are
 349 * connected or how they work.
 350 */
 351struct class {
 352        const char              *name;
 353        struct module           *owner;
 354
 355        struct class_attribute          *class_attrs;
 356        const struct attribute_group    **dev_groups;
 357        struct kobject                  *dev_kobj;
 358
 359        int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 360        char *(*devnode)(struct device *dev, umode_t *mode);
 361
 362        void (*class_release)(struct class *class);
 363        void (*dev_release)(struct device *dev);
 364
 365        int (*suspend)(struct device *dev, pm_message_t state);
 366        int (*resume)(struct device *dev);
 367
 368        const struct kobj_ns_type_operations *ns_type;
 369        const void *(*namespace)(struct device *dev);
 370
 371        const struct dev_pm_ops *pm;
 372
 373        struct subsys_private *p;
 374};
 375
 376struct class_dev_iter {
 377        struct klist_iter               ki;
 378        const struct device_type        *type;
 379};
 380
 381extern struct kobject *sysfs_dev_block_kobj;
 382extern struct kobject *sysfs_dev_char_kobj;
 383extern int __must_check __class_register(struct class *class,
 384                                         struct lock_class_key *key);
 385extern void class_unregister(struct class *class);
 386
 387/* This is a #define to keep the compiler from merging different
 388 * instances of the __key variable */
 389#define class_register(class)                   \
 390({                                              \
 391        static struct lock_class_key __key;     \
 392        __class_register(class, &__key);        \
 393})
 394
 395struct class_compat;
 396struct class_compat *class_compat_register(const char *name);
 397void class_compat_unregister(struct class_compat *cls);
 398int class_compat_create_link(struct class_compat *cls, struct device *dev,
 399                             struct device *device_link);
 400void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 401                              struct device *device_link);
 402
 403extern void class_dev_iter_init(struct class_dev_iter *iter,
 404                                struct class *class,
 405                                struct device *start,
 406                                const struct device_type *type);
 407extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 408extern void class_dev_iter_exit(struct class_dev_iter *iter);
 409
 410extern int class_for_each_device(struct class *class, struct device *start,
 411                                 void *data,
 412                                 int (*fn)(struct device *dev, void *data));
 413extern struct device *class_find_device(struct class *class,
 414                                        struct device *start, const void *data,
 415                                        int (*match)(struct device *, const void *));
 416
 417struct class_attribute {
 418        struct attribute attr;
 419        ssize_t (*show)(struct class *class, struct class_attribute *attr,
 420                        char *buf);
 421        ssize_t (*store)(struct class *class, struct class_attribute *attr,
 422                        const char *buf, size_t count);
 423};
 424
 425#define CLASS_ATTR(_name, _mode, _show, _store) \
 426        struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 427#define CLASS_ATTR_RW(_name) \
 428        struct class_attribute class_attr_##_name = __ATTR_RW(_name)
 429#define CLASS_ATTR_RO(_name) \
 430        struct class_attribute class_attr_##_name = __ATTR_RO(_name)
 431
 432extern int __must_check class_create_file_ns(struct class *class,
 433                                             const struct class_attribute *attr,
 434                                             const void *ns);
 435extern void class_remove_file_ns(struct class *class,
 436                                 const struct class_attribute *attr,
 437                                 const void *ns);
 438
 439static inline int __must_check class_create_file(struct class *class,
 440                                        const struct class_attribute *attr)
 441{
 442        return class_create_file_ns(class, attr, NULL);
 443}
 444
 445static inline void class_remove_file(struct class *class,
 446                                     const struct class_attribute *attr)
 447{
 448        return class_remove_file_ns(class, attr, NULL);
 449}
 450
 451/* Simple class attribute that is just a static string */
 452struct class_attribute_string {
 453        struct class_attribute attr;
 454        char *str;
 455};
 456
 457/* Currently read-only only */
 458#define _CLASS_ATTR_STRING(_name, _mode, _str) \
 459        { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
 460#define CLASS_ATTR_STRING(_name, _mode, _str) \
 461        struct class_attribute_string class_attr_##_name = \
 462                _CLASS_ATTR_STRING(_name, _mode, _str)
 463
 464extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
 465                        char *buf);
 466
 467struct class_interface {
 468        struct list_head        node;
 469        struct class            *class;
 470
 471        int (*add_dev)          (struct device *, struct class_interface *);
 472        void (*remove_dev)      (struct device *, struct class_interface *);
 473};
 474
 475extern int __must_check class_interface_register(struct class_interface *);
 476extern void class_interface_unregister(struct class_interface *);
 477
 478extern struct class * __must_check __class_create(struct module *owner,
 479                                                  const char *name,
 480                                                  struct lock_class_key *key);
 481extern void class_destroy(struct class *cls);
 482
 483/* This is a #define to keep the compiler from merging different
 484 * instances of the __key variable */
 485#define class_create(owner, name)               \
 486({                                              \
 487        static struct lock_class_key __key;     \
 488        __class_create(owner, name, &__key);    \
 489})
 490
 491/*
 492 * The type of device, "struct device" is embedded in. A class
 493 * or bus can contain devices of different types
 494 * like "partitions" and "disks", "mouse" and "event".
 495 * This identifies the device type and carries type-specific
 496 * information, equivalent to the kobj_type of a kobject.
 497 * If "name" is specified, the uevent will contain it in
 498 * the DEVTYPE variable.
 499 */
 500struct device_type {
 501        const char *name;
 502        const struct attribute_group **groups;
 503        int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 504        char *(*devnode)(struct device *dev, umode_t *mode,
 505                         kuid_t *uid, kgid_t *gid);
 506        void (*release)(struct device *dev);
 507
 508        const struct dev_pm_ops *pm;
 509};
 510
 511/* interface for exporting device attributes */
 512struct device_attribute {
 513        struct attribute        attr;
 514        ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 515                        char *buf);
 516        ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 517                         const char *buf, size_t count);
 518};
 519
 520struct dev_ext_attribute {
 521        struct device_attribute attr;
 522        void *var;
 523};
 524
 525ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
 526                          char *buf);
 527ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
 528                           const char *buf, size_t count);
 529ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
 530                        char *buf);
 531ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
 532                         const char *buf, size_t count);
 533ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
 534                        char *buf);
 535ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
 536                         const char *buf, size_t count);
 537
 538#define DEVICE_ATTR(_name, _mode, _show, _store) \
 539        struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 540#define DEVICE_ATTR_RW(_name) \
 541        struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
 542#define DEVICE_ATTR_RO(_name) \
 543        struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
 544#define DEVICE_ATTR_WO(_name) \
 545        struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
 546#define DEVICE_ULONG_ATTR(_name, _mode, _var) \
 547        struct dev_ext_attribute dev_attr_##_name = \
 548                { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
 549#define DEVICE_INT_ATTR(_name, _mode, _var) \
 550        struct dev_ext_attribute dev_attr_##_name = \
 551                { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
 552#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
 553        struct dev_ext_attribute dev_attr_##_name = \
 554                { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
 555#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
 556        struct device_attribute dev_attr_##_name =              \
 557                __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
 558
 559extern int device_create_file(struct device *device,
 560                              const struct device_attribute *entry);
 561extern void device_remove_file(struct device *dev,
 562                               const struct device_attribute *attr);
 563extern int __must_check device_create_bin_file(struct device *dev,
 564                                        const struct bin_attribute *attr);
 565extern void device_remove_bin_file(struct device *dev,
 566                                   const struct bin_attribute *attr);
 567extern int device_schedule_callback_owner(struct device *dev,
 568                void (*func)(struct device *dev), struct module *owner);
 569
 570/* This is a macro to avoid include problems with THIS_MODULE */
 571#define device_schedule_callback(dev, func)                     \
 572        device_schedule_callback_owner(dev, func, THIS_MODULE)
 573
 574/* device resource management */
 575typedef void (*dr_release_t)(struct device *dev, void *res);
 576typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 577
 578#ifdef CONFIG_DEBUG_DEVRES
 579extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 580                             const char *name);
 581#define devres_alloc(release, size, gfp) \
 582        __devres_alloc(release, size, gfp, #release)
 583#else
 584extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 585#endif
 586extern void devres_for_each_res(struct device *dev, dr_release_t release,
 587                                dr_match_t match, void *match_data,
 588                                void (*fn)(struct device *, void *, void *),
 589                                void *data);
 590extern void devres_free(void *res);
 591extern void devres_add(struct device *dev, void *res);
 592extern void *devres_find(struct device *dev, dr_release_t release,
 593                         dr_match_t match, void *match_data);
 594extern void *devres_get(struct device *dev, void *new_res,
 595                        dr_match_t match, void *match_data);
 596extern void *devres_remove(struct device *dev, dr_release_t release,
 597                           dr_match_t match, void *match_data);
 598extern int devres_destroy(struct device *dev, dr_release_t release,
 599                          dr_match_t match, void *match_data);
 600extern int devres_release(struct device *dev, dr_release_t release,
 601                          dr_match_t match, void *match_data);
 602
 603/* devres group */
 604extern void * __must_check devres_open_group(struct device *dev, void *id,
 605                                             gfp_t gfp);
 606extern void devres_close_group(struct device *dev, void *id);
 607extern void devres_remove_group(struct device *dev, void *id);
 608extern int devres_release_group(struct device *dev, void *id);
 609
 610/* managed devm_k.alloc/kfree for device drivers */
 611extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp);
 612static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
 613{
 614        return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
 615}
 616static inline void *devm_kmalloc_array(struct device *dev,
 617                                       size_t n, size_t size, gfp_t flags)
 618{
 619        if (size != 0 && n > SIZE_MAX / size)
 620                return NULL;
 621        return devm_kmalloc(dev, n * size, flags);
 622}
 623static inline void *devm_kcalloc(struct device *dev,
 624                                 size_t n, size_t size, gfp_t flags)
 625{
 626        return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
 627}
 628extern void devm_kfree(struct device *dev, void *p);
 629
 630void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
 631void __iomem *devm_request_and_ioremap(struct device *dev,
 632                        struct resource *res);
 633
 634/* allows to add/remove a custom action to devres stack */
 635int devm_add_action(struct device *dev, void (*action)(void *), void *data);
 636void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
 637
 638struct device_dma_parameters {
 639        /*
 640         * a low level driver may set these to teach IOMMU code about
 641         * sg limitations.
 642         */
 643        unsigned int max_segment_size;
 644        unsigned long segment_boundary_mask;
 645};
 646
 647struct acpi_device;
 648
 649struct acpi_dev_node {
 650#ifdef CONFIG_ACPI
 651        struct acpi_device *companion;
 652#endif
 653};
 654
 655/**
 656 * struct device - The basic device structure
 657 * @parent:     The device's "parent" device, the device to which it is attached.
 658 *              In most cases, a parent device is some sort of bus or host
 659 *              controller. If parent is NULL, the device, is a top-level device,
 660 *              which is not usually what you want.
 661 * @p:          Holds the private data of the driver core portions of the device.
 662 *              See the comment of the struct device_private for detail.
 663 * @kobj:       A top-level, abstract class from which other classes are derived.
 664 * @init_name:  Initial name of the device.
 665 * @type:       The type of device.
 666 *              This identifies the device type and carries type-specific
 667 *              information.
 668 * @mutex:      Mutex to synchronize calls to its driver.
 669 * @bus:        Type of bus device is on.
 670 * @driver:     Which driver has allocated this
 671 * @platform_data: Platform data specific to the device.
 672 *              Example: For devices on custom boards, as typical of embedded
 673 *              and SOC based hardware, Linux often uses platform_data to point
 674 *              to board-specific structures describing devices and how they
 675 *              are wired.  That can include what ports are available, chip
 676 *              variants, which GPIO pins act in what additional roles, and so
 677 *              on.  This shrinks the "Board Support Packages" (BSPs) and
 678 *              minimizes board-specific #ifdefs in drivers.
 679 * @power:      For device power management.
 680 *              See Documentation/power/devices.txt for details.
 681 * @pm_domain:  Provide callbacks that are executed during system suspend,
 682 *              hibernation, system resume and during runtime PM transitions
 683 *              along with subsystem-level and driver-level callbacks.
 684 * @pins:       For device pin management.
 685 *              See Documentation/pinctrl.txt for details.
 686 * @numa_node:  NUMA node this device is close to.
 687 * @dma_mask:   Dma mask (if dma'ble device).
 688 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
 689 *              hardware supports 64-bit addresses for consistent allocations
 690 *              such descriptors.
 691 * @dma_parms:  A low level driver may set these to teach IOMMU code about
 692 *              segment limitations.
 693 * @dma_pools:  Dma pools (if dma'ble device).
 694 * @dma_mem:    Internal for coherent mem override.
 695 * @cma_area:   Contiguous memory area for dma allocations
 696 * @archdata:   For arch-specific additions.
 697 * @of_node:    Associated device tree node.
 698 * @acpi_node:  Associated ACPI device node.
 699 * @devt:       For creating the sysfs "dev".
 700 * @id:         device instance
 701 * @devres_lock: Spinlock to protect the resource of the device.
 702 * @devres_head: The resources list of the device.
 703 * @knode_class: The node used to add the device to the class list.
 704 * @class:      The class of the device.
 705 * @groups:     Optional attribute groups.
 706 * @release:    Callback to free the device after all references have
 707 *              gone away. This should be set by the allocator of the
 708 *              device (i.e. the bus driver that discovered the device).
 709 * @iommu_group: IOMMU group the device belongs to.
 710 *
 711 * @offline_disabled: If set, the device is permanently online.
 712 * @offline:    Set after successful invocation of bus type's .offline().
 713 *
 714 * At the lowest level, every device in a Linux system is represented by an
 715 * instance of struct device. The device structure contains the information
 716 * that the device model core needs to model the system. Most subsystems,
 717 * however, track additional information about the devices they host. As a
 718 * result, it is rare for devices to be represented by bare device structures;
 719 * instead, that structure, like kobject structures, is usually embedded within
 720 * a higher-level representation of the device.
 721 */
 722struct device {
 723        struct device           *parent;
 724
 725        struct device_private   *p;
 726
 727        struct kobject kobj;
 728        const char              *init_name; /* initial name of the device */
 729        const struct device_type *type;
 730
 731        struct mutex            mutex;  /* mutex to synchronize calls to
 732                                         * its driver.
 733                                         */
 734
 735        struct bus_type *bus;           /* type of bus device is on */
 736        struct device_driver *driver;   /* which driver has allocated this
 737                                           device */
 738        void            *platform_data; /* Platform specific data, device
 739                                           core doesn't touch it */
 740        struct dev_pm_info      power;
 741        struct dev_pm_domain    *pm_domain;
 742
 743#ifdef CONFIG_PINCTRL
 744        struct dev_pin_info     *pins;
 745#endif
 746
 747#ifdef CONFIG_NUMA
 748        int             numa_node;      /* NUMA node this device is close to */
 749#endif
 750        u64             *dma_mask;      /* dma mask (if dma'able device) */
 751        u64             coherent_dma_mask;/* Like dma_mask, but for
 752                                             alloc_coherent mappings as
 753                                             not all hardware supports
 754                                             64 bit addresses for consistent
 755                                             allocations such descriptors. */
 756
 757        struct device_dma_parameters *dma_parms;
 758
 759        struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 760
 761        struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 762                                             override */
 763#ifdef CONFIG_DMA_CMA
 764        struct cma *cma_area;           /* contiguous memory area for dma
 765                                           allocations */
 766#endif
 767        /* arch specific additions */
 768        struct dev_archdata     archdata;
 769
 770        struct device_node      *of_node; /* associated device tree node */
 771        struct acpi_dev_node    acpi_node; /* associated ACPI device node */
 772
 773        dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 774        u32                     id;     /* device instance */
 775
 776        spinlock_t              devres_lock;
 777        struct list_head        devres_head;
 778
 779        struct klist_node       knode_class;
 780        struct class            *class;
 781        const struct attribute_group **groups;  /* optional groups */
 782
 783        void    (*release)(struct device *dev);
 784        struct iommu_group      *iommu_group;
 785
 786        bool                    offline_disabled:1;
 787        bool                    offline:1;
 788};
 789
 790static inline struct device *kobj_to_dev(struct kobject *kobj)
 791{
 792        return container_of(kobj, struct device, kobj);
 793}
 794
 795/* Get the wakeup routines, which depend on struct device */
 796#include <linux/pm_wakeup.h>
 797
 798static inline const char *dev_name(const struct device *dev)
 799{
 800        /* Use the init name until the kobject becomes available */
 801        if (dev->init_name)
 802                return dev->init_name;
 803
 804        return kobject_name(&dev->kobj);
 805}
 806
 807extern __printf(2, 3)
 808int dev_set_name(struct device *dev, const char *name, ...);
 809
 810#ifdef CONFIG_NUMA
 811static inline int dev_to_node(struct device *dev)
 812{
 813        return dev->numa_node;
 814}
 815static inline void set_dev_node(struct device *dev, int node)
 816{
 817        dev->numa_node = node;
 818}
 819#else
 820static inline int dev_to_node(struct device *dev)
 821{
 822        return -1;
 823}
 824static inline void set_dev_node(struct device *dev, int node)
 825{
 826}
 827#endif
 828
 829static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
 830{
 831        return dev ? dev->power.subsys_data : NULL;
 832}
 833
 834static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 835{
 836        return dev->kobj.uevent_suppress;
 837}
 838
 839static inline void dev_set_uevent_suppress(struct device *dev, int val)
 840{
 841        dev->kobj.uevent_suppress = val;
 842}
 843
 844static inline int device_is_registered(struct device *dev)
 845{
 846        return dev->kobj.state_in_sysfs;
 847}
 848
 849static inline void device_enable_async_suspend(struct device *dev)
 850{
 851        if (!dev->power.is_prepared)
 852                dev->power.async_suspend = true;
 853}
 854
 855static inline void device_disable_async_suspend(struct device *dev)
 856{
 857        if (!dev->power.is_prepared)
 858                dev->power.async_suspend = false;
 859}
 860
 861static inline bool device_async_suspend_enabled(struct device *dev)
 862{
 863        return !!dev->power.async_suspend;
 864}
 865
 866static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
 867{
 868        dev->power.ignore_children = enable;
 869}
 870
 871static inline void dev_pm_syscore_device(struct device *dev, bool val)
 872{
 873#ifdef CONFIG_PM_SLEEP
 874        dev->power.syscore = val;
 875#endif
 876}
 877
 878static inline void device_lock(struct device *dev)
 879{
 880        mutex_lock(&dev->mutex);
 881}
 882
 883static inline int device_trylock(struct device *dev)
 884{
 885        return mutex_trylock(&dev->mutex);
 886}
 887
 888static inline void device_unlock(struct device *dev)
 889{
 890        mutex_unlock(&dev->mutex);
 891}
 892
 893void driver_init(void);
 894
 895/*
 896 * High level routines for use by the bus drivers
 897 */
 898extern int __must_check device_register(struct device *dev);
 899extern void device_unregister(struct device *dev);
 900extern void device_initialize(struct device *dev);
 901extern int __must_check device_add(struct device *dev);
 902extern void device_del(struct device *dev);
 903extern int device_for_each_child(struct device *dev, void *data,
 904                     int (*fn)(struct device *dev, void *data));
 905extern struct device *device_find_child(struct device *dev, void *data,
 906                                int (*match)(struct device *dev, void *data));
 907extern int device_rename(struct device *dev, const char *new_name);
 908extern int device_move(struct device *dev, struct device *new_parent,
 909                       enum dpm_order dpm_order);
 910extern const char *device_get_devnode(struct device *dev,
 911                                      umode_t *mode, kuid_t *uid, kgid_t *gid,
 912                                      const char **tmp);
 913extern void *dev_get_drvdata(const struct device *dev);
 914extern int dev_set_drvdata(struct device *dev, void *data);
 915
 916static inline bool device_supports_offline(struct device *dev)
 917{
 918        return dev->bus && dev->bus->offline && dev->bus->online;
 919}
 920
 921extern void lock_device_hotplug(void);
 922extern void unlock_device_hotplug(void);
 923extern int lock_device_hotplug_sysfs(void);
 924extern int device_offline(struct device *dev);
 925extern int device_online(struct device *dev);
 926/*
 927 * Root device objects for grouping under /sys/devices
 928 */
 929extern struct device *__root_device_register(const char *name,
 930                                             struct module *owner);
 931
 932/*
 933 * This is a macro to avoid include problems with THIS_MODULE,
 934 * just as per what is done for device_schedule_callback() above.
 935 */
 936#define root_device_register(name) \
 937        __root_device_register(name, THIS_MODULE)
 938
 939extern void root_device_unregister(struct device *root);
 940
 941static inline void *dev_get_platdata(const struct device *dev)
 942{
 943        return dev->platform_data;
 944}
 945
 946/*
 947 * Manual binding of a device to driver. See drivers/base/bus.c
 948 * for information on use.
 949 */
 950extern int __must_check device_bind_driver(struct device *dev);
 951extern void device_release_driver(struct device *dev);
 952extern int  __must_check device_attach(struct device *dev);
 953extern int __must_check driver_attach(struct device_driver *drv);
 954extern int __must_check device_reprobe(struct device *dev);
 955
 956/*
 957 * Easy functions for dynamically creating devices on the fly
 958 */
 959extern struct device *device_create_vargs(struct class *cls,
 960                                          struct device *parent,
 961                                          dev_t devt,
 962                                          void *drvdata,
 963                                          const char *fmt,
 964                                          va_list vargs);
 965extern __printf(5, 6)
 966struct device *device_create(struct class *cls, struct device *parent,
 967                             dev_t devt, void *drvdata,
 968                             const char *fmt, ...);
 969extern __printf(6, 7)
 970struct device *device_create_with_groups(struct class *cls,
 971                             struct device *parent, dev_t devt, void *drvdata,
 972                             const struct attribute_group **groups,
 973                             const char *fmt, ...);
 974extern void device_destroy(struct class *cls, dev_t devt);
 975
 976/*
 977 * Platform "fixup" functions - allow the platform to have their say
 978 * about devices and actions that the general device layer doesn't
 979 * know about.
 980 */
 981/* Notify platform of device discovery */
 982extern int (*platform_notify)(struct device *dev);
 983
 984extern int (*platform_notify_remove)(struct device *dev);
 985
 986
 987/*
 988 * get_device - atomically increment the reference count for the device.
 989 *
 990 */
 991extern struct device *get_device(struct device *dev);
 992extern void put_device(struct device *dev);
 993
 994#ifdef CONFIG_DEVTMPFS
 995extern int devtmpfs_create_node(struct device *dev);
 996extern int devtmpfs_delete_node(struct device *dev);
 997extern int devtmpfs_mount(const char *mntdir);
 998#else
 999static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1000static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1001static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1002#endif
1003
1004/* drivers/base/power/shutdown.c */
1005extern void device_shutdown(void);
1006
1007/* debugging and troubleshooting/diagnostic helpers. */
1008extern const char *dev_driver_string(const struct device *dev);
1009
1010
1011#ifdef CONFIG_PRINTK
1012
1013extern __printf(3, 0)
1014int dev_vprintk_emit(int level, const struct device *dev,
1015                     const char *fmt, va_list args);
1016extern __printf(3, 4)
1017int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1018
1019extern __printf(3, 4)
1020int dev_printk(const char *level, const struct device *dev,
1021               const char *fmt, ...);
1022extern __printf(2, 3)
1023int dev_emerg(const struct device *dev, const char *fmt, ...);
1024extern __printf(2, 3)
1025int dev_alert(const struct device *dev, const char *fmt, ...);
1026extern __printf(2, 3)
1027int dev_crit(const struct device *dev, const char *fmt, ...);
1028extern __printf(2, 3)
1029int dev_err(const struct device *dev, const char *fmt, ...);
1030extern __printf(2, 3)
1031int dev_warn(const struct device *dev, const char *fmt, ...);
1032extern __printf(2, 3)
1033int dev_notice(const struct device *dev, const char *fmt, ...);
1034extern __printf(2, 3)
1035int _dev_info(const struct device *dev, const char *fmt, ...);
1036
1037#else
1038
1039static inline __printf(3, 0)
1040int dev_vprintk_emit(int level, const struct device *dev,
1041                     const char *fmt, va_list args)
1042{ return 0; }
1043static inline __printf(3, 4)
1044int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1045{ return 0; }
1046
1047static inline int __dev_printk(const char *level, const struct device *dev,
1048                               struct va_format *vaf)
1049{ return 0; }
1050static inline __printf(3, 4)
1051int dev_printk(const char *level, const struct device *dev,
1052               const char *fmt, ...)
1053{ return 0; }
1054
1055static inline __printf(2, 3)
1056int dev_emerg(const struct device *dev, const char *fmt, ...)
1057{ return 0; }
1058static inline __printf(2, 3)
1059int dev_crit(const struct device *dev, const char *fmt, ...)
1060{ return 0; }
1061static inline __printf(2, 3)
1062int dev_alert(const struct device *dev, const char *fmt, ...)
1063{ return 0; }
1064static inline __printf(2, 3)
1065int dev_err(const struct device *dev, const char *fmt, ...)
1066{ return 0; }
1067static inline __printf(2, 3)
1068int dev_warn(const struct device *dev, const char *fmt, ...)
1069{ return 0; }
1070static inline __printf(2, 3)
1071int dev_notice(const struct device *dev, const char *fmt, ...)
1072{ return 0; }
1073static inline __printf(2, 3)
1074int _dev_info(const struct device *dev, const char *fmt, ...)
1075{ return 0; }
1076
1077#endif
1078
1079/*
1080 * Stupid hackaround for existing uses of non-printk uses dev_info
1081 *
1082 * Note that the definition of dev_info below is actually _dev_info
1083 * and a macro is used to avoid redefining dev_info
1084 */
1085
1086#define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1087
1088#if defined(CONFIG_DYNAMIC_DEBUG)
1089#define dev_dbg(dev, format, ...)                    \
1090do {                                                 \
1091        dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1092} while (0)
1093#elif defined(DEBUG)
1094#define dev_dbg(dev, format, arg...)            \
1095        dev_printk(KERN_DEBUG, dev, format, ##arg)
1096#else
1097#define dev_dbg(dev, format, arg...)                            \
1098({                                                              \
1099        if (0)                                                  \
1100                dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1101        0;                                                      \
1102})
1103#endif
1104
1105#define dev_level_ratelimited(dev_level, dev, fmt, ...)                 \
1106do {                                                                    \
1107        static DEFINE_RATELIMIT_STATE(_rs,                              \
1108                                      DEFAULT_RATELIMIT_INTERVAL,       \
1109                                      DEFAULT_RATELIMIT_BURST);         \
1110        if (__ratelimit(&_rs))                                          \
1111                dev_level(dev, fmt, ##__VA_ARGS__);                     \
1112} while (0)
1113
1114#define dev_emerg_ratelimited(dev, fmt, ...)                            \
1115        dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1116#define dev_alert_ratelimited(dev, fmt, ...)                            \
1117        dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1118#define dev_crit_ratelimited(dev, fmt, ...)                             \
1119        dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1120#define dev_err_ratelimited(dev, fmt, ...)                              \
1121        dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1122#define dev_warn_ratelimited(dev, fmt, ...)                             \
1123        dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1124#define dev_notice_ratelimited(dev, fmt, ...)                           \
1125        dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1126#define dev_info_ratelimited(dev, fmt, ...)                             \
1127        dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1128#if defined(CONFIG_DYNAMIC_DEBUG)
1129/* descriptor check is first to prevent flooding with "callbacks suppressed" */
1130#define dev_dbg_ratelimited(dev, fmt, ...)                              \
1131do {                                                                    \
1132        static DEFINE_RATELIMIT_STATE(_rs,                              \
1133                                      DEFAULT_RATELIMIT_INTERVAL,       \
1134                                      DEFAULT_RATELIMIT_BURST);         \
1135        DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
1136        if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
1137            __ratelimit(&_rs))                                          \
1138                __dynamic_dev_dbg(&descriptor, dev, fmt,                \
1139                                  ##__VA_ARGS__);                       \
1140} while (0)
1141#elif defined(DEBUG)
1142#define dev_dbg_ratelimited(dev, fmt, ...)                              \
1143do {                                                                    \
1144        static DEFINE_RATELIMIT_STATE(_rs,                              \
1145                                      DEFAULT_RATELIMIT_INTERVAL,       \
1146                                      DEFAULT_RATELIMIT_BURST);         \
1147        if (__ratelimit(&_rs))                                          \
1148                dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__);        \
1149} while (0)
1150#else
1151#define dev_dbg_ratelimited(dev, fmt, ...)                      \
1152        no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
1153#endif
1154
1155#ifdef VERBOSE_DEBUG
1156#define dev_vdbg        dev_dbg
1157#else
1158#define dev_vdbg(dev, format, arg...)                           \
1159({                                                              \
1160        if (0)                                                  \
1161                dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1162        0;                                                      \
1163})
1164#endif
1165
1166/*
1167 * dev_WARN*() acts like dev_printk(), but with the key difference of
1168 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1169 */
1170#define dev_WARN(dev, format, arg...) \
1171        WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1172
1173#define dev_WARN_ONCE(dev, condition, format, arg...) \
1174        WARN_ONCE(condition, "%s %s: " format, \
1175                        dev_driver_string(dev), dev_name(dev), ## arg)
1176
1177/* Create alias, so I can be autoloaded. */
1178#define MODULE_ALIAS_CHARDEV(major,minor) \
1179        MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1180#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1181        MODULE_ALIAS("char-major-" __stringify(major) "-*")
1182
1183#ifdef CONFIG_SYSFS_DEPRECATED
1184extern long sysfs_deprecated;
1185#else
1186#define sysfs_deprecated 0
1187#endif
1188
1189/**
1190 * module_driver() - Helper macro for drivers that don't do anything
1191 * special in module init/exit. This eliminates a lot of boilerplate.
1192 * Each module may only use this macro once, and calling it replaces
1193 * module_init() and module_exit().
1194 *
1195 * @__driver: driver name
1196 * @__register: register function for this driver type
1197 * @__unregister: unregister function for this driver type
1198 * @...: Additional arguments to be passed to __register and __unregister.
1199 *
1200 * Use this macro to construct bus specific macros for registering
1201 * drivers, and do not use it on its own.
1202 */
1203#define module_driver(__driver, __register, __unregister, ...) \
1204static int __init __driver##_init(void) \
1205{ \
1206        return __register(&(__driver) , ##__VA_ARGS__); \
1207} \
1208module_init(__driver##_init); \
1209static void __exit __driver##_exit(void) \
1210{ \
1211        __unregister(&(__driver) , ##__VA_ARGS__); \
1212} \
1213module_exit(__driver##_exit);
1214
1215#endif /* _DEVICE_H_ */
1216
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