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
  38 struct 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)   \
  45 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  46
  47 extern int __must_check bus_create_file(struct bus_type *,
  48                                         struct bus_attribute *);
  49 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  50
  51 struct 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
  71 extern int __must_check bus_register(struct bus_type *bus);
  72 extern void bus_unregister(struct bus_type *bus);
  73
  74 extern int __must_check bus_rescan_devices(struct bus_type *bus);
  75
  76 /* iterator helpers for buses */
  77
  78 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
  79                      int (*fn)(struct device *dev, void *data));
  80 struct device *bus_find_device(struct bus_type *bus, struct device *start,
  81                                void *data,
  82                                int (*match)(struct device *dev, void *data));
  83 struct device *bus_find_device_by_name(struct bus_type *bus,
  84                                        struct device *start,
  85                                        const char *name);
  86
  87 int __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
  91 void 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  */
 100 struct notifier_block;
 101
 102 extern int bus_register_notifier(struct bus_type *bus,
 103                                  struct notifier_block *nb);
 104 extern 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
 119 extern struct kset *bus_get_kset(struct bus_type *bus);
 120 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 121
 122 struct 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         int (*probe) (struct device *dev);
 132         int (*remove) (struct device *dev);
 133         void (*shutdown) (struct device *dev);
 134         int (*suspend) (struct device *dev, pm_message_t state);
 135         int (*resume) (struct device *dev);
 136         const struct attribute_group **groups;
 137
 138         const struct dev_pm_ops *pm;
 139
 140         struct driver_private *p;
 141 };
 142
 143
 144 extern int __must_check driver_register(struct device_driver *drv);
 145 extern void driver_unregister(struct device_driver *drv);
 146
 147 extern struct device_driver *get_driver(struct device_driver *drv);
 148 extern void put_driver(struct device_driver *drv);
 149 extern struct device_driver *driver_find(const char *name,
 150                                          struct bus_type *bus);
 151 extern int driver_probe_done(void);
 152 extern void wait_for_device_probe(void);
 153
 154
 155 /* sysfs interface for exporting driver attributes */
 156
 157 struct driver_attribute {
 158         struct attribute attr;
 159         ssize_t (*show)(struct device_driver *driver, char *buf);
 160         ssize_t (*store)(struct device_driver *driver, const char *buf,
 161                          size_t count);
 162 };
 163
 164 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 165 struct driver_attribute driver_attr_##_name =           \
 166         __ATTR(_name, _mode, _show, _store)
 167
 168 extern int __must_check driver_create_file(struct device_driver *driver,
 169                                         const struct driver_attribute *attr);
 170 extern void driver_remove_file(struct device_driver *driver,
 171                                const struct driver_attribute *attr);
 172
 173 extern int __must_check driver_add_kobj(struct device_driver *drv,
 174                                         struct kobject *kobj,
 175                                         const char *fmt, ...);
 176
 177 extern int __must_check driver_for_each_device(struct device_driver *drv,
 178                                                struct device *start,
 179                                                void *data,
 180                                                int (*fn)(struct device *dev,
 181                                                          void *));
 182 struct device *driver_find_device(struct device_driver *drv,
 183                                   struct device *start, void *data,
 184                                   int (*match)(struct device *dev, void *data));
 185
 186 /*
 187  * device classes
 188  */
 189 struct class {
 190         const char              *name;
 191         struct module           *owner;
 192
 193         struct class_attribute          *class_attrs;
 194         struct device_attribute         *dev_attrs;
 195         struct kobject                  *dev_kobj;
 196
 197         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 198         char *(*devnode)(struct device *dev, mode_t *mode);
 199
 200         void (*class_release)(struct class *class);
 201         void (*dev_release)(struct device *dev);
 202
 203         int (*suspend)(struct device *dev, pm_message_t state);
 204         int (*resume)(struct device *dev);
 205
 206         const struct dev_pm_ops *pm;
 207
 208         struct class_private *p;
 209 };
 210
 211 struct class_dev_iter {
 212         struct klist_iter               ki;
 213         const struct device_type        *type;
 214 };
 215
 216 extern struct kobject *sysfs_dev_block_kobj;
 217 extern struct kobject *sysfs_dev_char_kobj;
 218 extern int __must_check __class_register(struct class *class,
 219                                          struct lock_class_key *key);
 220 extern void class_unregister(struct class *class);
 221
 222 /* This is a #define to keep the compiler from merging different
 223  * instances of the __key variable */
 224 #define class_register(class)                   \
 225 ({                                              \
 226         static struct lock_class_key __key;     \
 227         __class_register(class, &__key);        \
 228 })
 229
 230 struct class_compat;
 231 struct class_compat *class_compat_register(const char *name);
 232 void class_compat_unregister(struct class_compat *cls);
 233 int class_compat_create_link(struct class_compat *cls, struct device *dev,
 234                              struct device *device_link);
 235 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 236                               struct device *device_link);
 237
 238 extern void class_dev_iter_init(struct class_dev_iter *iter,
 239                                 struct class *class,
 240                                 struct device *start,
 241                                 const struct device_type *type);
 242 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 243 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 244
 245 extern int class_for_each_device(struct class *class, struct device *start,
 246                                  void *data,
 247                                  int (*fn)(struct device *dev, void *data));
 248 extern struct device *class_find_device(struct class *class,
 249                                         struct device *start, void *data,
 250                                         int (*match)(struct device *, void *));
 251
 252 struct class_attribute {
 253         struct attribute attr;
 254         ssize_t (*show)(struct class *class, struct class_attribute *attr,
 255                         char *buf);
 256         ssize_t (*store)(struct class *class, struct class_attribute *attr,
 257                         const char *buf, size_t count);
 258 };
 259
 260 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 261 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 262
 263 extern int __must_check class_create_file(struct class *class,
 264                                           const struct class_attribute *attr);
 265 extern void class_remove_file(struct class *class,
 266                               const struct class_attribute *attr);
 267
 268 /* Simple class attribute that is just a static string */
 269
 270 struct class_attribute_string {
 271         struct class_attribute attr;
 272         char *str;
 273 };
 274
 275 /* Currently read-only only */
 276 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
 277         { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
 278 #define CLASS_ATTR_STRING(_name, _mode, _str) \
 279         struct class_attribute_string class_attr_##_name = \
 280                 _CLASS_ATTR_STRING(_name, _mode, _str)
 281
 282 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
 283                         char *buf);
 284
 285 struct class_interface {
 286         struct list_head        node;
 287         struct class            *class;
 288
 289         int (*add_dev)          (struct device *, struct class_interface *);
 290         void (*remove_dev)      (struct device *, struct class_interface *);
 291 };
 292
 293 extern int __must_check class_interface_register(struct class_interface *);
 294 extern void class_interface_unregister(struct class_interface *);
 295
 296 extern struct class * __must_check __class_create(struct module *owner,
 297                                                   const char *name,
 298                                                   struct lock_class_key *key);
 299 extern void class_destroy(struct class *cls);
 300
 301 /* This is a #define to keep the compiler from merging different
 302  * instances of the __key variable */
 303 #define class_create(owner, name)               \
 304 ({                                              \
 305         static struct lock_class_key __key;     \
 306         __class_create(owner, name, &__key);    \
 307 })
 308
 309 /*
 310  * The type of device, "struct device" is embedded in. A class
 311  * or bus can contain devices of different types
 312  * like "partitions" and "disks", "mouse" and "event".
 313  * This identifies the device type and carries type-specific
 314  * information, equivalent to the kobj_type of a kobject.
 315  * If "name" is specified, the uevent will contain it in
 316  * the DEVTYPE variable.
 317  */
 318 struct device_type {
 319         const char *name;
 320         const struct attribute_group **groups;
 321         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 322         char *(*devnode)(struct device *dev, mode_t *mode);
 323         void (*release)(struct device *dev);
 324
 325         const struct dev_pm_ops *pm;
 326 };
 327
 328 /* interface for exporting device attributes */
 329 struct device_attribute {
 330         struct attribute        attr;
 331         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 332                         char *buf);
 333         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 334                          const char *buf, size_t count);
 335 };
 336
 337 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 338 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 339
 340 extern int __must_check device_create_file(struct device *device,
 341                                         const struct device_attribute *entry);
 342 extern void device_remove_file(struct device *dev,
 343                                const struct device_attribute *attr);
 344 extern int __must_check device_create_bin_file(struct device *dev,
 345                                         const struct bin_attribute *attr);
 346 extern void device_remove_bin_file(struct device *dev,
 347                                    const struct bin_attribute *attr);
 348 extern int device_schedule_callback_owner(struct device *dev,
 349                 void (*func)(struct device *dev), struct module *owner);
 350
 351 /* This is a macro to avoid include problems with THIS_MODULE */
 352 #define device_schedule_callback(dev, func)                     \
 353         device_schedule_callback_owner(dev, func, THIS_MODULE)
 354
 355 /* device resource management */
 356 typedef void (*dr_release_t)(struct device *dev, void *res);
 357 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 358
 359 #ifdef CONFIG_DEBUG_DEVRES
 360 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 361                              const char *name);
 362 #define devres_alloc(release, size, gfp) \
 363         __devres_alloc(release, size, gfp, #release)
 364 #else
 365 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 366 #endif
 367 extern void devres_free(void *res);
 368 extern void devres_add(struct device *dev, void *res);
 369 extern void *devres_find(struct device *dev, dr_release_t release,
 370                          dr_match_t match, void *match_data);
 371 extern void *devres_get(struct device *dev, void *new_res,
 372                         dr_match_t match, void *match_data);
 373 extern void *devres_remove(struct device *dev, dr_release_t release,
 374                            dr_match_t match, void *match_data);
 375 extern int devres_destroy(struct device *dev, dr_release_t release,
 376                           dr_match_t match, void *match_data);
 377
 378 /* devres group */
 379 extern void * __must_check devres_open_group(struct device *dev, void *id,
 380                                              gfp_t gfp);
 381 extern void devres_close_group(struct device *dev, void *id);
 382 extern void devres_remove_group(struct device *dev, void *id);
 383 extern int devres_release_group(struct device *dev, void *id);
 384
 385 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 386 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 387 extern void devm_kfree(struct device *dev, void *p);
 388
 389 struct device_dma_parameters {
 390         /*
 391          * a low level driver may set these to teach IOMMU code about
 392          * sg limitations.
 393          */
 394         unsigned int max_segment_size;
 395         unsigned long segment_boundary_mask;
 396 };
 397
 398 struct device {
 399         struct device           *parent;
 400
 401         struct device_private   *p;
 402
 403         struct kobject kobj;
 404         const char              *init_name; /* initial name of the device */
 405         struct device_type      *type;
 406
 407         struct semaphore        sem;    /* semaphore to synchronize calls to
 408                                          * its driver.
 409                                          */
 410
 411         struct bus_type *bus;           /* type of bus device is on */
 412         struct device_driver *driver;   /* which driver has allocated this
 413                                            device */
 414         void            *platform_data; /* Platform specific data, device
 415                                            core doesn't touch it */
 416         struct dev_pm_info      power;
 417
 418 #ifdef CONFIG_NUMA
 419         int             numa_node;      /* NUMA node this device is close to */
 420 #endif
 421         u64             *dma_mask;      /* dma mask (if dma'able device) */
 422         u64             coherent_dma_mask;/* Like dma_mask, but for
 423                                              alloc_coherent mappings as
 424                                              not all hardware supports
 425                                              64 bit addresses for consistent
 426                                              allocations such descriptors. */
 427
 428         struct device_dma_parameters *dma_parms;
 429
 430         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 431
 432         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 433                                              override */
 434         /* arch specific additions */
 435         struct dev_archdata     archdata;
 436
 437         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 438
 439         spinlock_t              devres_lock;
 440         struct list_head        devres_head;
 441
 442         struct klist_node       knode_class;
 443         struct class            *class;
 444         const struct attribute_group **groups;  /* optional groups */
 445
 446         void    (*release)(struct device *dev);
 447 };
 448
 449 /* Get the wakeup routines, which depend on struct device */
 450 #include <linux/pm_wakeup.h>
 451
 452 static inline const char *dev_name(const struct device *dev)
 453 {
 454         /* Use the init name until the kobject becomes available */
 455         if (dev->init_name)
 456                 return dev->init_name;
 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_ */