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 struct device_node;
  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 #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
 148 extern int __must_check driver_register(struct device_driver *drv);
 149 extern void driver_unregister(struct device_driver *drv);
 150
 151 extern struct device_driver *get_driver(struct device_driver *drv);
 152 extern void put_driver(struct device_driver *drv);
 153 extern struct device_driver *driver_find(const char *name,
 154                                          struct bus_type *bus);
 155 extern int driver_probe_done(void);
 156 extern void wait_for_device_probe(void);
 157
 158
 159 /* sysfs interface for exporting driver attributes */
 160
 161 struct 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)        \
 169 struct driver_attribute driver_attr_##_name =           \
 170         __ATTR(_name, _mode, _show, _store)
 171
 172 extern int __must_check driver_create_file(struct device_driver *driver,
 173                                         const struct driver_attribute *attr);
 174 extern void driver_remove_file(struct device_driver *driver,
 175                                const struct driver_attribute *attr);
 176
 177 extern int __must_check driver_add_kobj(struct device_driver *drv,
 178                                         struct kobject *kobj,
 179                                         const char *fmt, ...);
 180
 181 extern 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 *));
 186 struct 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  */
 193 struct 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
 218 struct class_dev_iter {
 219         struct klist_iter               ki;
 220         const struct device_type        *type;
 221 };
 222
 223 extern struct kobject *sysfs_dev_block_kobj;
 224 extern struct kobject *sysfs_dev_char_kobj;
 225 extern int __must_check __class_register(struct class *class,
 226                                          struct lock_class_key *key);
 227 extern 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
 237 struct class_compat;
 238 struct class_compat *class_compat_register(const char *name);
 239 void class_compat_unregister(struct class_compat *cls);
 240 int class_compat_create_link(struct class_compat *cls, struct device *dev,
 241                              struct device *device_link);
 242 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 243                               struct device *device_link);
 244
 245 extern void class_dev_iter_init(struct class_dev_iter *iter,
 246                                 struct class *class,
 247                                 struct device *start,
 248                                 const struct device_type *type);
 249 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 250 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 251
 252 extern int class_for_each_device(struct class *class, struct device *start,
 253                                  void *data,
 254                                  int (*fn)(struct device *dev, void *data));
 255 extern struct device *class_find_device(struct class *class,
 256                                         struct device *start, void *data,
 257                                         int (*match)(struct device *, void *));
 258
 259 struct 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)                 \
 268 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 269
 270 extern int __must_check class_create_file(struct class *class,
 271                                           const struct class_attribute *attr);
 272 extern 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
 277 struct 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
 289 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
 290                         char *buf);
 291
 292 struct 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
 300 extern int __must_check class_interface_register(struct class_interface *);
 301 extern void class_interface_unregister(struct class_interface *);
 302
 303 extern struct class * __must_check __class_create(struct module *owner,
 304                                                   const char *name,
 305                                                   struct lock_class_key *key);
 306 extern 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  */
 325 struct 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 */
 336 struct 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) \
 345 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 346
 347 extern int __must_check device_create_file(struct device *device,
 348                                         const struct device_attribute *entry);
 349 extern void device_remove_file(struct device *dev,
 350                                const struct device_attribute *attr);
 351 extern int __must_check device_create_bin_file(struct device *dev,
 352                                         const struct bin_attribute *attr);
 353 extern void device_remove_bin_file(struct device *dev,
 354                                    const struct bin_attribute *attr);
 355 extern 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 */
 363 typedef void (*dr_release_t)(struct device *dev, void *res);
 364 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 365
 366 #ifdef CONFIG_DEBUG_DEVRES
 367 extern 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
 372 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 373 #endif
 374 extern void devres_free(void *res);
 375 extern void devres_add(struct device *dev, void *res);
 376 extern void *devres_find(struct device *dev, dr_release_t release,
 377                          dr_match_t match, void *match_data);
 378 extern void *devres_get(struct device *dev, void *new_res,
 379                         dr_match_t match, void *match_data);
 380 extern void *devres_remove(struct device *dev, dr_release_t release,
 381                            dr_match_t match, void *match_data);
 382 extern int devres_destroy(struct device *dev, dr_release_t release,
 383                           dr_match_t match, void *match_data);
 384
 385 /* devres group */
 386 extern void * __must_check devres_open_group(struct device *dev, void *id,
 387                                              gfp_t gfp);
 388 extern void devres_close_group(struct device *dev, void *id);
 389 extern void devres_remove_group(struct device *dev, void *id);
 390 extern int devres_release_group(struct device *dev, void *id);
 391
 392 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 393 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 394 extern void devm_kfree(struct device *dev, void *p);
 395
 396 struct 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
 405 struct 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
 462 static 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
 471 extern int dev_set_name(struct device *dev, const char *name, ...)
 472                         __attribute__((format(printf, 2, 3)));
 473
 474 #ifdef CONFIG_NUMA
 475 static inline int dev_to_node(struct device *dev)
 476 {
 477         return dev->numa_node;
 478 }
 479 static inline void set_dev_node(struct device *dev, int node)
 480 {
 481         dev->numa_node = node;
 482 }
 483 #else
 484 static inline int dev_to_node(struct device *dev)
 485 {
 486         return -1;
 487 }
 488 static inline void set_dev_node(struct device *dev, int node)
 489 {
 490 }
 491 #endif
 492
 493 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 494 {
 495         return dev->kobj.uevent_suppress;
 496 }
 497
 498 static inline void dev_set_uevent_suppress(struct device *dev, int val)
 499 {
 500         dev->kobj.uevent_suppress = val;
 501 }
 502
 503 static inline int device_is_registered(struct device *dev)
 504 {
 505         return dev->kobj.state_in_sysfs;
 506 }
 507
 508 static 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
 514 static 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
 520 static inline bool device_async_suspend_enabled(struct device *dev)
 521 {
 522         return !!dev->power.async_suspend;
 523 }
 524
 525 static inline void device_lock(struct device *dev)
 526 {
 527         mutex_lock(&dev->mutex);
 528 }
 529
 530 static inline int device_trylock(struct device *dev)
 531 {
 532         return mutex_trylock(&dev->mutex);
 533 }
 534
 535 static inline void device_unlock(struct device *dev)
 536 {
 537         mutex_unlock(&dev->mutex);
 538 }
 539
 540 void driver_init(void);
 541
 542 /*
 543  * High level routines for use by the bus drivers
 544  */
 545 extern int __must_check device_register(struct device *dev);
 546 extern void device_unregister(struct device *dev);
 547 extern void device_initialize(struct device *dev);
 548 extern int __must_check device_add(struct device *dev);
 549 extern void device_del(struct device *dev);
 550 extern int device_for_each_child(struct device *dev, void *data,
 551                      int (*fn)(struct device *dev, void *data));
 552 extern struct device *device_find_child(struct device *dev, void *data,
 553                                 int (*match)(struct device *dev, void *data));
 554 extern int device_rename(struct device *dev, char *new_name);
 555 extern int device_move(struct device *dev, struct device *new_parent,
 556                        enum dpm_order dpm_order);
 557 extern const char *device_get_devnode(struct device *dev,
 558                                       mode_t *mode, const char **tmp);
 559 extern void *dev_get_drvdata(const struct device *dev);
 560 extern void dev_set_drvdata(struct device *dev, void *data);
 561
 562 /*
 563  * Root device objects for grouping under /sys/devices
 564  */
 565 extern struct device *__root_device_register(const char *name,
 566                                              struct module *owner);
 567 static inline struct device *root_device_register(const char *name)
 568 {
 569         return __root_device_register(name, THIS_MODULE);
 570 }
 571 extern void root_device_unregister(struct device *root);
 572
 573 static 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  */
 582 extern int __must_check device_bind_driver(struct device *dev);
 583 extern void device_release_driver(struct device *dev);
 584 extern int  __must_check device_attach(struct device *dev);
 585 extern int __must_check driver_attach(struct device_driver *drv);
 586 extern int __must_check device_reprobe(struct device *dev);
 587
 588 /*
 589  * Easy functions for dynamically creating devices on the fly
 590  */
 591 extern 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);
 597 extern 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)));
 601 extern 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 */
 609 extern int (*platform_notify)(struct device *dev);
 610
 611 extern int (*platform_notify_remove)(struct device *dev);
 612
 613
 614 /**
 615  * get_device - atomically increment the reference count for the device.
 616  *
 617  */
 618 extern struct device *get_device(struct device *dev);
 619 extern void put_device(struct device *dev);
 620
 621 extern void wait_for_device_probe(void);
 622
 623 #ifdef CONFIG_DEVTMPFS
 624 extern int devtmpfs_create_node(struct device *dev);
 625 extern int devtmpfs_delete_node(struct device *dev);
 626 extern int devtmpfs_mount(const char *mntdir);
 627 #else
 628 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 629 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
 630 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
 631 #endif
 632
 633 /* drivers/base/power/shutdown.c */
 634 extern void device_shutdown(void);
 635
 636 /* drivers/base/sys.c */
 637 extern void sysdev_shutdown(void);
 638
 639 /* debugging and troubleshooting/diagnostic helpers. */
 640 extern 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_ */