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