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