LXR linux/include/linux/device.h

   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/module.h>
  24#include <linux/pm.h>
  25#include <asm/atomic.h>
  26#include <asm/device.h>
  27
  28struct device;
  29struct device_private;
  30struct device_driver;
  31struct driver_private;
  32struct class;
  33struct class_private;
  34struct bus_type;
  35struct bus_type_private;
  36struct device_node;
  37
  38struct bus_attribute {
  39        struct attribute        attr;
  40        ssize_t (*show)(struct bus_type *bus, char *buf);
  41        ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  42};
  43
  44#define BUS_ATTR(_name, _mode, _show, _store)   \
  45struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  46
  47extern int __must_check bus_create_file(struct bus_type *,
  48                                        struct bus_attribute *);
  49extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  50
  51struct bus_type {
  52        const char              *name;
  53        struct bus_attribute    *bus_attrs;
  54        struct device_attribute *dev_attrs;
  55        struct driver_attribute *drv_attrs;
  56
  57        int (*match)(struct device *dev, struct device_driver *drv);
  58        int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  59        int (*probe)(struct device *dev);
  60        int (*remove)(struct device *dev);
  61        void (*shutdown)(struct device *dev);
  62
  63        int (*suspend)(struct device *dev, pm_message_t state);
  64        int (*resume)(struct device *dev);
  65
  66        const struct dev_pm_ops *pm;
  67
  68        struct bus_type_private *p;
  69};
  70
  71extern int __must_check bus_register(struct bus_type *bus);
  72extern void bus_unregister(struct bus_type *bus);
  73
  74extern int __must_check bus_rescan_devices(struct bus_type *bus);
  75
  76/* iterator helpers for buses */
  77
  78int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
  79                     int (*fn)(struct device *dev, void *data));
  80struct device *bus_find_device(struct bus_type *bus, struct device *start,
  81                               void *data,
  82                               int (*match)(struct device *dev, void *data));
  83struct device *bus_find_device_by_name(struct bus_type *bus,
  84                                       struct device *start,
  85                                       const char *name);
  86
  87int __must_check bus_for_each_drv(struct bus_type *bus,
  88                                  struct device_driver *start, void *data,
  89                                  int (*fn)(struct device_driver *, void *));
  90
  91void bus_sort_breadthfirst(struct bus_type *bus,
  92                           int (*compare)(const struct device *a,
  93                                          const struct device *b));
  94/*
  95 * Bus notifiers: Get notified of addition/removal of devices
  96 * and binding/unbinding of drivers to devices.
  97 * In the long run, it should be a replacement for the platform
  98 * notify hooks.
  99 */
 100struct notifier_block;
 101
 102extern int bus_register_notifier(struct bus_type *bus,
 103                                 struct notifier_block *nb);
 104extern int bus_unregister_notifier(struct bus_type *bus,
 105                                   struct notifier_block *nb);
 106
 107/* All 4 notifers below get called with the target struct device *
 108 * as an argument. Note that those functions are likely to be called
 109 * with the device lock held in the core, so be careful.
 110 */
 111#define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 112#define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 113#define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 114#define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 115                                                      unbound */
 116#define BUS_NOTIFY_UNBOUND_DRIVER       0x00000005 /* driver is unbound
 117                                                      from the device */
 118
 119extern struct kset *bus_get_kset(struct bus_type *bus);
 120extern struct klist *bus_get_device_klist(struct bus_type *bus);
 121
 122struct device_driver {
 123        const char              *name;
 124        struct bus_type         *bus;
 125
 126        struct module           *owner;
 127        const char              *mod_name;      /* used for built-in modules */
 128
 129        bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
 130
 131#if defined(CONFIG_OF)
 132        const struct of_device_id       *of_match_table;
 133#endif
 134
 135        int (*probe) (struct device *dev);
 136        int (*remove) (struct device *dev);
 137        void (*shutdown) (struct device *dev);
 138        int (*suspend) (struct device *dev, pm_message_t state);
 139        int (*resume) (struct device *dev);
 140        const struct attribute_group **groups;
 141
 142        const struct dev_pm_ops *pm;
 143
 144        struct driver_private *p;
 145};
 146
 147
 148extern int __must_check driver_register(struct device_driver *drv);
 149extern void driver_unregister(struct device_driver *drv);
 150
 151extern struct device_driver *get_driver(struct device_driver *drv);
 152extern void put_driver(struct device_driver *drv);
 153extern struct device_driver *driver_find(const char *name,
 154                                         struct bus_type *bus);
 155extern int driver_probe_done(void);
 156extern void wait_for_device_probe(void);
 157
 158
 159/* sysfs interface for exporting driver attributes */
 160
 161struct driver_attribute {
 162        struct attribute attr;
 163        ssize_t (*show)(struct device_driver *driver, char *buf);
 164        ssize_t (*store)(struct device_driver *driver, const char *buf,
 165                         size_t count);
 166};
 167
 168#define DRIVER_ATTR(_name, _mode, _show, _store)        \
 169struct driver_attribute driver_attr_##_name =           \
 170        __ATTR(_name, _mode, _show, _store)
 171
 172extern int __must_check driver_create_file(struct device_driver *driver,
 173                                        const struct driver_attribute *attr);
 174extern void driver_remove_file(struct device_driver *driver,
 175                               const struct driver_attribute *attr);
 176
 177extern int __must_check driver_add_kobj(struct device_driver *drv,
 178                                        struct kobject *kobj,
 179                                        const char *fmt, ...);
 180
 181extern int __must_check driver_for_each_device(struct device_driver *drv,
 182                                               struct device *start,
 183                                               void *data,
 184                                               int (*fn)(struct device *dev,
 185                                                         void *));
 186struct device *driver_find_device(struct device_driver *drv,
 187                                  struct device *start, void *data,
 188                                  int (*match)(struct device *dev, void *data));
 189
 190/*
 191 * device classes
 192 */
 193struct class {
 194        const char              *name;
 195        struct module           *owner;
 196
 197        struct class_attribute          *class_attrs;
 198        struct device_attribute         *dev_attrs;
 199        struct kobject                  *dev_kobj;
 200
 201        int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 202        char *(*devnode)(struct device *dev, mode_t *mode);
 203
 204        void (*class_release)(struct class *class);
 205        void (*dev_release)(struct device *dev);
 206
 207        int (*suspend)(struct device *dev, pm_message_t state);
 208        int (*resume)(struct device *dev);
 209
 210        const struct kobj_ns_type_operations *ns_type;
 211        const void *(*namespace)(struct device *dev);
 212
 213        const struct dev_pm_ops *pm;
 214
 215        struct class_private *p;
 216};
 217
 218struct class_dev_iter {
 219        struct klist_iter               ki;
 220        const struct device_type        *type;
 221};
 222
 223extern struct kobject *sysfs_dev_block_kobj;
 224extern struct kobject *sysfs_dev_char_kobj;
 225extern int __must_check __class_register(struct class *class,
 226                                         struct lock_class_key *key);
 227extern void class_unregister(struct class *class);
 228
 229/* This is a #define to keep the compiler from merging different
 230 * instances of the __key variable */
 231#define class_register(class)                   \
 232({                                              \
 233        static struct lock_class_key __key;     \
 234        __class_register(class, &__key);        \
 235})
 236
 237struct class_compat;
 238struct class_compat *class_compat_register(const char *name);
 239void class_compat_unregister(struct class_compat *cls);
 240int class_compat_create_link(struct class_compat *cls, struct device *dev,
 241                             struct device *device_link);
 242void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 243                              struct device *device_link);
 244
 245extern void class_dev_iter_init(struct class_dev_iter *iter,
 246                                struct class *class,
 247                                struct device *start,
 248                                const struct device_type *type);
 249extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 250extern void class_dev_iter_exit(struct class_dev_iter *iter);
 251
 252extern int class_for_each_device(struct class *class, struct device *start,
 253                                 void *data,
 254                                 int (*fn)(struct device *dev, void *data));
 255extern struct device *class_find_device(struct class *class,
 256                                        struct device *start, void *data,
 257                                        int (*match)(struct device *, void *));
 258
 259struct class_attribute {
 260        struct attribute attr;
 261        ssize_t (*show)(struct class *class, struct class_attribute *attr,
 262                        char *buf);
 263        ssize_t (*store)(struct class *class, struct class_attribute *attr,
 264                        const char *buf, size_t count);
 265};
 266
 267#define CLASS_ATTR(_name, _mode, _show, _store)                 \
 268struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 269
 270extern int __must_check class_create_file(struct class *class,
 271                                          const struct class_attribute *attr);
 272extern void class_remove_file(struct class *class,
 273                              const struct class_attribute *attr);
 274
 275/* Simple class attribute that is just a static string */
 276
 277struct class_attribute_string {
 278        struct class_attribute attr;
 279        char *str;
 280};
 281
 282/* Currently read-only only */
 283#define _CLASS_ATTR_STRING(_name, _mode, _str) \
 284        { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
 285#define CLASS_ATTR_STRING(_name, _mode, _str) \
 286        struct class_attribute_string class_attr_##_name = \
 287                _CLASS_ATTR_STRING(_name, _mode, _str)
 288
 289extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
 290                        char *buf);
 291
 292struct class_interface {
 293        struct list_head        node;
 294        struct class            *class;
 295
 296        int (*add_dev)          (struct device *, struct class_interface *);
 297        void (*remove_dev)      (struct device *, struct class_interface *);
 298};
 299
 300extern int __must_check class_interface_register(struct class_interface *);
 301extern void class_interface_unregister(struct class_interface *);
 302
 303extern struct class * __must_check __class_create(struct module *owner,
 304                                                  const char *name,
 305                                                  struct lock_class_key *key);
 306extern void class_destroy(struct class *cls);
 307
 308/* This is a #define to keep the compiler from merging different
 309 * instances of the __key variable */
 310#define class_create(owner, name)               \
 311({                                              \
 312        static struct lock_class_key __key;     \
 313        __class_create(owner, name, &__key);    \
 314})
 315
 316/*
 317 * The type of device, "struct device" is embedded in. A class
 318 * or bus can contain devices of different types
 319 * like "partitions" and "disks", "mouse" and "event".
 320 * This identifies the device type and carries type-specific
 321 * information, equivalent to the kobj_type of a kobject.
 322 * If "name" is specified, the uevent will contain it in
 323 * the DEVTYPE variable.
 324 */
 325struct device_type {
 326        const char *name;
 327        const struct attribute_group **groups;
 328        int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 329        char *(*devnode)(struct device *dev, mode_t *mode);
 330        void (*release)(struct device *dev);
 331
 332        const struct dev_pm_ops *pm;
 333};
 334
 335/* interface for exporting device attributes */
 336struct device_attribute {
 337        struct attribute        attr;
 338        ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 339                        char *buf);
 340        ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 341                         const char *buf, size_t count);
 342};
 343
 344#define DEVICE_ATTR(_name, _mode, _show, _store) \
 345struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 346
 347extern int __must_check device_create_file(struct device *device,
 348                                        const struct device_attribute *entry);
 349extern void device_remove_file(struct device *dev,
 350                               const struct device_attribute *attr);
 351extern int __must_check device_create_bin_file(struct device *dev,
 352                                        const struct bin_attribute *attr);
 353extern void device_remove_bin_file(struct device *dev,
 354                                   const struct bin_attribute *attr);
 355extern int device_schedule_callback_owner(struct device *dev,
 356                void (*func)(struct device *dev), struct module *owner);
 357
 358/* This is a macro to avoid include problems with THIS_MODULE */
 359#define device_schedule_callback(dev, func)                     \
 360        device_schedule_callback_owner(dev, func, THIS_MODULE)
 361
 362/* device resource management */
 363typedef void (*dr_release_t)(struct device *dev, void *res);
 364typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 365
 366#ifdef CONFIG_DEBUG_DEVRES
 367extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 368                             const char *name);
 369#define devres_alloc(release, size, gfp) \
 370        __devres_alloc(release, size, gfp, #release)
 371#else
 372extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 373#endif
 374extern void devres_free(void *res);
 375extern void devres_add(struct device *dev, void *res);
 376extern void *devres_find(struct device *dev, dr_release_t release,
 377                         dr_match_t match, void *match_data);
 378extern void *devres_get(struct device *dev, void *new_res,
 379                        dr_match_t match, void *match_data);
 380extern void *devres_remove(struct device *dev, dr_release_t release,
 381                           dr_match_t match, void *match_data);
 382extern int devres_destroy(struct device *dev, dr_release_t release,
 383                          dr_match_t match, void *match_data);
 384
 385/* devres group */
 386extern void * __must_check devres_open_group(struct device *dev, void *id,
 387                                             gfp_t gfp);
 388extern void devres_close_group(struct device *dev, void *id);
 389extern void devres_remove_group(struct device *dev, void *id);
 390extern int devres_release_group(struct device *dev, void *id);
 391
 392/* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 393extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 394extern void devm_kfree(struct device *dev, void *p);
 395
 396struct device_dma_parameters {
 397        /*
 398         * a low level driver may set these to teach IOMMU code about
 399         * sg limitations.
 400         */
 401        unsigned int max_segment_size;
 402        unsigned long segment_boundary_mask;
 403};
 404
 405struct device {
 406        struct device           *parent;
 407
 408        struct device_private   *p;
 409
 410        struct kobject kobj;
 411        const char              *init_name; /* initial name of the device */
 412        struct device_type      *type;
 413
 414        struct mutex            mutex;  /* mutex to synchronize calls to
 415                                         * its driver.
 416                                         */
 417
 418        struct bus_type *bus;           /* type of bus device is on */
 419        struct device_driver *driver;   /* which driver has allocated this
 420                                           device */
 421        void            *platform_data; /* Platform specific data, device
 422                                           core doesn't touch it */
 423        struct dev_pm_info      power;
 424
 425#ifdef CONFIG_NUMA
 426        int             numa_node;      /* NUMA node this device is close to */
 427#endif
 428        u64             *dma_mask;      /* dma mask (if dma'able device) */
 429        u64             coherent_dma_mask;/* Like dma_mask, but for
 430                                             alloc_coherent mappings as
 431                                             not all hardware supports
 432                                             64 bit addresses for consistent
 433                                             allocations such descriptors. */
 434
 435        struct device_dma_parameters *dma_parms;
 436
 437        struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 438
 439        struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 440                                             override */
 441        /* arch specific additions */
 442        struct dev_archdata     archdata;
 443#ifdef CONFIG_OF
 444        struct device_node      *of_node;
 445#endif
 446
 447        dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 448
 449        spinlock_t              devres_lock;
 450        struct list_head        devres_head;
 451
 452        struct klist_node       knode_class;
 453        struct class            *class;
 454        const struct attribute_group **groups;  /* optional groups */
 455
 456        void    (*release)(struct device *dev);
 457};
 458
 459/* Get the wakeup routines, which depend on struct device */
 460#include <linux/pm_wakeup.h>
 461
 462static inline const char *dev_name(const struct device *dev)
 463{
 464        /* Use the init name until the kobject becomes available */
 465        if (dev->init_name)
 466                return dev->init_name;
 467
 468        return kobject_name(&dev->kobj);
 469}
 470
 471extern int dev_set_name(struct device *dev, const char *name, ...)
 472                        __attribute__((format(printf, 2, 3)));
 473
 474#ifdef CONFIG_NUMA
 475static inline int dev_to_node(struct device *dev)
 476{
 477        return dev->numa_node;
 478}
 479static inline void set_dev_node(struct device *dev, int node)
 480{
 481        dev->numa_node = node;
 482}
 483#else
 484static inline int dev_to_node(struct device *dev)
 485{
 486        return -1;
 487}
 488static inline void set_dev_node(struct device *dev, int node)
 489{
 490}
 491#endif
 492
 493static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 494{
 495        return dev->kobj.uevent_suppress;
 496}
 497
 498static inline void dev_set_uevent_suppress(struct device *dev, int val)
 499{
 500        dev->kobj.uevent_suppress = val;
 501}
 502
 503static inline int device_is_registered(struct device *dev)
 504{
 505        return dev->kobj.state_in_sysfs;
 506}
 507
 508static inline void device_enable_async_suspend(struct device *dev)
 509{
 510        if (dev->power.status == DPM_ON)
 511                dev->power.async_suspend = true;
 512}
 513
 514static inline void device_disable_async_suspend(struct device *dev)
 515{
 516        if (dev->power.status == DPM_ON)
 517                dev->power.async_suspend = false;
 518}
 519
 520static inline bool device_async_suspend_enabled(struct device *dev)
 521{
 522        return !!dev->power.async_suspend;
 523}
 524
 525static inline void device_lock(struct device *dev)
 526{
 527        mutex_lock(&dev->mutex);
 528}
 529
 530static inline int device_trylock(struct device *dev)
 531{
 532        return mutex_trylock(&dev->mutex);
 533}
 534
 535static inline void device_unlock(struct device *dev)
 536{
 537        mutex_unlock(&dev->mutex);
 538}
 539
 540void driver_init(void);
 541
 542/*
 543 * High level routines for use by the bus drivers
 544 */
 545extern int __must_check device_register(struct device *dev);
 546extern void device_unregister(struct device *dev);
 547extern void device_initialize(struct device *dev);
 548extern int __must_check device_add(struct device *dev);
 549extern void device_del(struct device *dev);
 550extern int device_for_each_child(struct device *dev, void *data,
 551                     int (*fn)(struct device *dev, void *data));
 552extern struct device *device_find_child(struct device *dev, void *data,
 553                                int (*match)(struct device *dev, void *data));
 554extern int device_rename(struct device *dev, char *new_name);
 555extern int device_move(struct device *dev, struct device *new_parent,
 556                       enum dpm_order dpm_order);
 557extern const char *device_get_devnode(struct device *dev,
 558                                      mode_t *mode, const char **tmp);
 559extern void *dev_get_drvdata(const struct device *dev);
 560extern void dev_set_drvdata(struct device *dev, void *data);
 561
 562/*
 563 * Root device objects for grouping under /sys/devices
 564 */
 565extern struct device *__root_device_register(const char *name,
 566                                             struct module *owner);
 567static inline struct device *root_device_register(const char *name)
 568{
 569        return __root_device_register(name, THIS_MODULE);
 570}
 571extern void root_device_unregister(struct device *root);
 572
 573static inline void *dev_get_platdata(const struct device *dev)
 574{
 575        return dev->platform_data;
 576}
 577
 578/*
 579 * Manual binding of a device to driver. See drivers/base/bus.c
 580 * for information on use.
 581 */
 582extern int __must_check device_bind_driver(struct device *dev);
 583extern void device_release_driver(struct device *dev);
 584extern int  __must_check device_attach(struct device *dev);
 585extern int __must_check driver_attach(struct device_driver *drv);
 586extern int __must_check device_reprobe(struct device *dev);
 587
 588/*
 589 * Easy functions for dynamically creating devices on the fly
 590 */
 591extern struct device *device_create_vargs(struct class *cls,
 592                                          struct device *parent,
 593                                          dev_t devt,
 594                                          void *drvdata,
 595                                          const char *fmt,
 596                                          va_list vargs);
 597extern struct device *device_create(struct class *cls, struct device *parent,
 598                                    dev_t devt, void *drvdata,
 599                                    const char *fmt, ...)
 600                                    __attribute__((format(printf, 5, 6)));
 601extern void device_destroy(struct class *cls, dev_t devt);
 602
 603/*
 604 * Platform "fixup" functions - allow the platform to have their say
 605 * about devices and actions that the general device layer doesn't
 606 * know about.
 607 */
 608/* Notify platform of device discovery */
 609extern int (*platform_notify)(struct device *dev);
 610
 611extern int (*platform_notify_remove)(struct device *dev);
 612
 613
 614/**
 615 * get_device - atomically increment the reference count for the device.
 616 *
 617 */
 618extern struct device *get_device(struct device *dev);
 619extern void put_device(struct device *dev);
 620
 621extern void wait_for_device_probe(void);
 622
 623#ifdef CONFIG_DEVTMPFS
 624extern int devtmpfs_create_node(struct device *dev);
 625extern int devtmpfs_delete_node(struct device *dev);
 626extern int devtmpfs_mount(const char *mntdir);
 627#else
 628static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 629static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
 630static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
 631#endif
 632
 633/* drivers/base/power/shutdown.c */
 634extern void device_shutdown(void);
 635
 636/* drivers/base/sys.c */
 637extern void sysdev_shutdown(void);
 638
 639/* debugging and troubleshooting/diagnostic helpers. */
 640extern const char *dev_driver_string(const struct device *dev);
 641#define dev_printk(level, dev, format, arg...)  \
 642        printk(level "%s %s: " format , dev_driver_string(dev) , \
 643               dev_name(dev) , ## arg)
 644
 645#define dev_emerg(dev, format, arg...)          \
 646        dev_printk(KERN_EMERG , dev , format , ## arg)
 647#define dev_alert(dev, format, arg...)          \
 648        dev_printk(KERN_ALERT , dev , format , ## arg)
 649#define dev_crit(dev, format, arg...)           \
 650        dev_printk(KERN_CRIT , dev , format , ## arg)
 651#define dev_err(dev, format, arg...)            \
 652        dev_printk(KERN_ERR , dev , format , ## arg)
 653#define dev_warn(dev, format, arg...)           \
 654        dev_printk(KERN_WARNING , dev , format , ## arg)
 655#define dev_notice(dev, format, arg...)         \
 656        dev_printk(KERN_NOTICE , dev , format , ## arg)
 657#define dev_info(dev, format, arg...)           \
 658        dev_printk(KERN_INFO , dev , format , ## arg)
 659
 660#if defined(DEBUG)
 661#define dev_dbg(dev, format, arg...)            \
 662        dev_printk(KERN_DEBUG , dev , format , ## arg)
 663#elif defined(CONFIG_DYNAMIC_DEBUG)
 664#define dev_dbg(dev, format, ...) do { \
 665        dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 666        } while (0)
 667#else
 668#define dev_dbg(dev, format, arg...)            \
 669        ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 670#endif
 671
 672#ifdef VERBOSE_DEBUG
 673#define dev_vdbg        dev_dbg
 674#else
 675
 676#define dev_vdbg(dev, format, arg...)           \
 677        ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 678#endif
 679
 680/*
 681 * dev_WARN() acts like dev_printk(), but with the key difference
 682 * of using a WARN/WARN_ON to get the message out, including the
 683 * file/line information and a backtrace.
 684 */
 685#define dev_WARN(dev, format, arg...) \
 686        WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
 687
 688/* Create alias, so I can be autoloaded. */
 689#define MODULE_ALIAS_CHARDEV(major,minor) \
 690        MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 691#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 692        MODULE_ALIAS("char-major-" __stringify(major) "-*")
 693#endif /* _DEVICE_H_ */
 694