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 subsys_private;
  34 struct bus_type;
  35 struct device_node;
  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 subsys_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 bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
  87                      void *data, int (*fn)(struct device_driver *, void *));
  88
  89 void bus_sort_breadthfirst(struct bus_type *bus,
  90                            int (*compare)(const struct device *a,
  91                                           const struct device *b));
  92 /*
  93  * Bus notifiers: Get notified of addition/removal of devices
  94  * and binding/unbinding of drivers to devices.
  95  * In the long run, it should be a replacement for the platform
  96  * notify hooks.
  97  */
  98 struct notifier_block;
  99
 100 extern int bus_register_notifier(struct bus_type *bus,
 101                                  struct notifier_block *nb);
 102 extern int bus_unregister_notifier(struct bus_type *bus,
 103                                    struct notifier_block *nb);
 104
 105 /* All 4 notifers below get called with the target struct device *
 106  * as an argument. Note that those functions are likely to be called
 107  * with the device lock held in the core, so be careful.
 108  */
 109 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 110 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 111 #define BUS_NOTIFY_BIND_DRIVER          0x00000003 /* driver about to be
 112                                                       bound */
 113 #define BUS_NOTIFY_BOUND_DRIVER         0x00000004 /* driver bound to device */
 114 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000005 /* driver about to be
 115                                                       unbound */
 116 #define BUS_NOTIFY_UNBOUND_DRIVER       0x00000006 /* 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         const struct of_device_id       *of_match_table;
 132
 133         int (*probe) (struct device *dev);
 134         int (*remove) (struct device *dev);
 135         void (*shutdown) (struct device *dev);
 136         int (*suspend) (struct device *dev, pm_message_t state);
 137         int (*resume) (struct device *dev);
 138         const struct attribute_group **groups;
 139
 140         const struct dev_pm_ops *pm;
 141
 142         struct driver_private *p;
 143 };
 144
 145
 146 extern int __must_check driver_register(struct device_driver *drv);
 147 extern void driver_unregister(struct device_driver *drv);
 148
 149 extern struct device_driver *get_driver(struct device_driver *drv);
 150 extern void put_driver(struct device_driver *drv);
 151 extern struct device_driver *driver_find(const char *name,
 152                                          struct bus_type *bus);
 153 extern int driver_probe_done(void);
 154 extern void wait_for_device_probe(void);
 155
 156
 157 /* sysfs interface for exporting driver attributes */
 158
 159 struct driver_attribute {
 160         struct attribute attr;
 161         ssize_t (*show)(struct device_driver *driver, char *buf);
 162         ssize_t (*store)(struct device_driver *driver, const char *buf,
 163                          size_t count);
 164 };
 165
 166 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 167 struct driver_attribute driver_attr_##_name =           \
 168         __ATTR(_name, _mode, _show, _store)
 169
 170 extern int __must_check driver_create_file(struct device_driver *driver,
 171                                         const struct driver_attribute *attr);
 172 extern void driver_remove_file(struct device_driver *driver,
 173                                const struct driver_attribute *attr);
 174
 175 extern int __must_check driver_add_kobj(struct device_driver *drv,
 176                                         struct kobject *kobj,
 177                                         const char *fmt, ...);
 178
 179 extern int __must_check driver_for_each_device(struct device_driver *drv,
 180                                                struct device *start,
 181                                                void *data,
 182                                                int (*fn)(struct device *dev,
 183                                                          void *));
 184 struct device *driver_find_device(struct device_driver *drv,
 185                                   struct device *start, void *data,
 186                                   int (*match)(struct device *dev, void *data));
 187
 188 /*
 189  * device classes
 190  */
 191 struct class {
 192         const char              *name;
 193         struct module           *owner;
 194
 195         struct class_attribute          *class_attrs;
 196         struct device_attribute         *dev_attrs;
 197         struct bin_attribute            *dev_bin_attrs;
 198         struct kobject                  *dev_kobj;
 199
 200         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 201         char *(*devnode)(struct device *dev, mode_t *mode);
 202
 203         void (*class_release)(struct class *class);
 204         void (*dev_release)(struct device *dev);
 205
 206         int (*suspend)(struct device *dev, pm_message_t state);
 207         int (*resume)(struct device *dev);
 208
 209         const struct kobj_ns_type_operations *ns_type;
 210         const void *(*namespace)(struct device *dev);
 211
 212         const struct dev_pm_ops *pm;
 213
 214         struct subsys_private *p;
 215 };
 216
 217 struct class_dev_iter {
 218         struct klist_iter               ki;
 219         const struct device_type        *type;
 220 };
 221
 222 extern struct kobject *sysfs_dev_block_kobj;
 223 extern struct kobject *sysfs_dev_char_kobj;
 224 extern int __must_check __class_register(struct class *class,
 225                                          struct lock_class_key *key);
 226 extern void class_unregister(struct class *class);
 227
 228 /* This is a #define to keep the compiler from merging different
 229  * instances of the __key variable */
 230 #define class_register(class)                   \
 231 ({                                              \
 232         static struct lock_class_key __key;     \
 233         __class_register(class, &__key);        \
 234 })
 235
 236 struct class_compat;
 237 struct class_compat *class_compat_register(const char *name);
 238 void class_compat_unregister(struct class_compat *cls);
 239 int class_compat_create_link(struct class_compat *cls, struct device *dev,
 240                              struct device *device_link);
 241 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 242                               struct device *device_link);
 243
 244 extern void class_dev_iter_init(struct class_dev_iter *iter,
 245                                 struct class *class,
 246                                 struct device *start,
 247                                 const struct device_type *type);
 248 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 249 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 250
 251 extern int class_for_each_device(struct class *class, struct device *start,
 252                                  void *data,
 253                                  int (*fn)(struct device *dev, void *data));
 254 extern struct device *class_find_device(struct class *class,
 255                                         struct device *start, void *data,
 256                                         int (*match)(struct device *, void *));
 257
 258 struct class_attribute {
 259         struct attribute attr;
 260         ssize_t (*show)(struct class *class, struct class_attribute *attr,
 261                         char *buf);
 262         ssize_t (*store)(struct class *class, struct class_attribute *attr,
 263                         const char *buf, size_t count);
 264 };
 265
 266 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 267 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 268
 269 extern int __must_check class_create_file(struct class *class,
 270                                           const struct class_attribute *attr);
 271 extern void class_remove_file(struct class *class,
 272                               const struct class_attribute *attr);
 273
 274 /* Simple class attribute that is just a static string */
 275
 276 struct class_attribute_string {
 277         struct class_attribute attr;
 278         char *str;
 279 };
 280
 281 /* Currently read-only only */
 282 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
 283         { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
 284 #define CLASS_ATTR_STRING(_name, _mode, _str) \
 285         struct class_attribute_string class_attr_##_name = \
 286                 _CLASS_ATTR_STRING(_name, _mode, _str)
 287
 288 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
 289                         char *buf);
 290
 291 struct class_interface {
 292         struct list_head        node;
 293         struct class            *class;
 294
 295         int (*add_dev)          (struct device *, struct class_interface *);
 296         void (*remove_dev)      (struct device *, struct class_interface *);
 297 };
 298
 299 extern int __must_check class_interface_register(struct class_interface *);
 300 extern void class_interface_unregister(struct class_interface *);
 301
 302 extern struct class * __must_check __class_create(struct module *owner,
 303                                                   const char *name,
 304                                                   struct lock_class_key *key);
 305 extern void class_destroy(struct class *cls);
 306
 307 /* This is a #define to keep the compiler from merging different
 308  * instances of the __key variable */
 309 #define class_create(owner, name)               \
 310 ({                                              \
 311         static struct lock_class_key __key;     \
 312         __class_create(owner, name, &__key);    \
 313 })
 314
 315 /*
 316  * The type of device, "struct device" is embedded in. A class
 317  * or bus can contain devices of different types
 318  * like "partitions" and "disks", "mouse" and "event".
 319  * This identifies the device type and carries type-specific
 320  * information, equivalent to the kobj_type of a kobject.
 321  * If "name" is specified, the uevent will contain it in
 322  * the DEVTYPE variable.
 323  */
 324 struct device_type {
 325         const char *name;
 326         const struct attribute_group **groups;
 327         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 328         char *(*devnode)(struct device *dev, mode_t *mode);
 329         void (*release)(struct device *dev);
 330
 331         const struct dev_pm_ops *pm;
 332 };
 333
 334 /* interface for exporting device attributes */
 335 struct device_attribute {
 336         struct attribute        attr;
 337         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 338                         char *buf);
 339         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 340                          const char *buf, size_t count);
 341 };
 342
 343 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 344 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 345
 346 extern int __must_check device_create_file(struct device *device,
 347                                         const struct device_attribute *entry);
 348 extern void device_remove_file(struct device *dev,
 349                                const struct device_attribute *attr);
 350 extern int __must_check device_create_bin_file(struct device *dev,
 351                                         const struct bin_attribute *attr);
 352 extern void device_remove_bin_file(struct device *dev,
 353                                    const struct bin_attribute *attr);
 354 extern int device_schedule_callback_owner(struct device *dev,
 355                 void (*func)(struct device *dev), struct module *owner);
 356
 357 /* This is a macro to avoid include problems with THIS_MODULE */
 358 #define device_schedule_callback(dev, func)                     \
 359         device_schedule_callback_owner(dev, func, THIS_MODULE)
 360
 361 /* device resource management */
 362 typedef void (*dr_release_t)(struct device *dev, void *res);
 363 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 364
 365 #ifdef CONFIG_DEBUG_DEVRES
 366 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 367                              const char *name);
 368 #define devres_alloc(release, size, gfp) \
 369         __devres_alloc(release, size, gfp, #release)
 370 #else
 371 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 372 #endif
 373 extern void devres_free(void *res);
 374 extern void devres_add(struct device *dev, void *res);
 375 extern void *devres_find(struct device *dev, dr_release_t release,
 376                          dr_match_t match, void *match_data);
 377 extern void *devres_get(struct device *dev, void *new_res,
 378                         dr_match_t match, void *match_data);
 379 extern void *devres_remove(struct device *dev, dr_release_t release,
 380                            dr_match_t match, void *match_data);
 381 extern int devres_destroy(struct device *dev, dr_release_t release,
 382                           dr_match_t match, void *match_data);
 383
 384 /* devres group */
 385 extern void * __must_check devres_open_group(struct device *dev, void *id,
 386                                              gfp_t gfp);
 387 extern void devres_close_group(struct device *dev, void *id);
 388 extern void devres_remove_group(struct device *dev, void *id);
 389 extern int devres_release_group(struct device *dev, void *id);
 390
 391 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 392 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 393 extern void devm_kfree(struct device *dev, void *p);
 394
 395 struct device_dma_parameters {
 396         /*
 397          * a low level driver may set these to teach IOMMU code about
 398          * sg limitations.
 399          */
 400         unsigned int max_segment_size;
 401         unsigned long segment_boundary_mask;
 402 };
 403
 404 struct device {
 405         struct device           *parent;
 406
 407         struct device_private   *p;
 408
 409         struct kobject kobj;
 410         const char              *init_name; /* initial name of the device */
 411         struct device_type      *type;
 412
 413         struct mutex            mutex;  /* mutex to synchronize calls to
 414                                          * its driver.
 415                                          */
 416
 417         struct bus_type *bus;           /* type of bus device is on */
 418         struct device_driver *driver;   /* which driver has allocated this
 419                                            device */
 420         void            *platform_data; /* Platform specific data, device
 421                                            core doesn't touch it */
 422         struct dev_pm_info      power;
 423
 424 #ifdef CONFIG_NUMA
 425         int             numa_node;      /* NUMA node this device is close to */
 426 #endif
 427         u64             *dma_mask;      /* dma mask (if dma'able device) */
 428         u64             coherent_dma_mask;/* Like dma_mask, but for
 429                                              alloc_coherent mappings as
 430                                              not all hardware supports
 431                                              64 bit addresses for consistent
 432                                              allocations such descriptors. */
 433
 434         struct device_dma_parameters *dma_parms;
 435
 436         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 437
 438         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 439                                              override */
 440         /* arch specific additions */
 441         struct dev_archdata     archdata;
 442
 443         struct device_node      *of_node; /* associated device tree node */
 444
 445         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 446
 447         spinlock_t              devres_lock;
 448         struct list_head        devres_head;
 449
 450         struct klist_node       knode_class;
 451         struct class            *class;
 452         const struct attribute_group **groups;  /* optional groups */
 453
 454         void    (*release)(struct device *dev);
 455 };
 456
 457 /* Get the wakeup routines, which depend on struct device */
 458 #include <linux/pm_wakeup.h>
 459
 460 static inline const char *dev_name(const struct device *dev)
 461 {
 462         /* Use the init name until the kobject becomes available */
 463         if (dev->init_name)
 464                 return dev->init_name;
 465
 466         return kobject_name(&dev->kobj);
 467 }
 468
 469 extern int dev_set_name(struct device *dev, const char *name, ...)
 470                         __attribute__((format(printf, 2, 3)));
 471
 472 #ifdef CONFIG_NUMA
 473 static inline int dev_to_node(struct device *dev)
 474 {
 475         return dev->numa_node;
 476 }
 477 static inline void set_dev_node(struct device *dev, int node)
 478 {
 479         dev->numa_node = node;
 480 }
 481 #else
 482 static inline int dev_to_node(struct device *dev)
 483 {
 484         return -1;
 485 }
 486 static inline void set_dev_node(struct device *dev, int node)
 487 {
 488 }
 489 #endif
 490
 491 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 492 {
 493         return dev->kobj.uevent_suppress;
 494 }
 495
 496 static inline void dev_set_uevent_suppress(struct device *dev, int val)
 497 {
 498         dev->kobj.uevent_suppress = val;
 499 }
 500
 501 static inline int device_is_registered(struct device *dev)
 502 {
 503         return dev->kobj.state_in_sysfs;
 504 }
 505
 506 static inline void device_enable_async_suspend(struct device *dev)
 507 {
 508         if (!dev->power.in_suspend)
 509                 dev->power.async_suspend = true;
 510 }
 511
 512 static inline void device_disable_async_suspend(struct device *dev)
 513 {
 514         if (!dev->power.in_suspend)
 515                 dev->power.async_suspend = false;
 516 }
 517
 518 static inline bool device_async_suspend_enabled(struct device *dev)
 519 {
 520         return !!dev->power.async_suspend;
 521 }
 522
 523 static inline void device_lock(struct device *dev)
 524 {
 525         mutex_lock(&dev->mutex);
 526 }
 527
 528 static inline int device_trylock(struct device *dev)
 529 {
 530         return mutex_trylock(&dev->mutex);
 531 }
 532
 533 static inline void device_unlock(struct device *dev)
 534 {
 535         mutex_unlock(&dev->mutex);
 536 }
 537
 538 void driver_init(void);
 539
 540 /*
 541  * High level routines for use by the bus drivers
 542  */
 543 extern int __must_check device_register(struct device *dev);
 544 extern void device_unregister(struct device *dev);
 545 extern void device_initialize(struct device *dev);
 546 extern int __must_check device_add(struct device *dev);
 547 extern void device_del(struct device *dev);
 548 extern int device_for_each_child(struct device *dev, void *data,
 549                      int (*fn)(struct device *dev, void *data));
 550 extern struct device *device_find_child(struct device *dev, void *data,
 551                                 int (*match)(struct device *dev, void *data));
 552 extern int device_rename(struct device *dev, const char *new_name);
 553 extern int device_move(struct device *dev, struct device *new_parent,
 554                        enum dpm_order dpm_order);
 555 extern const char *device_get_devnode(struct device *dev,
 556                                       mode_t *mode, const char **tmp);
 557 extern void *dev_get_drvdata(const struct device *dev);
 558 extern void dev_set_drvdata(struct device *dev, void *data);
 559
 560 /*
 561  * Root device objects for grouping under /sys/devices
 562  */
 563 extern struct device *__root_device_register(const char *name,
 564                                              struct module *owner);
 565 static inline struct device *root_device_register(const char *name)
 566 {
 567         return __root_device_register(name, THIS_MODULE);
 568 }
 569 extern void root_device_unregister(struct device *root);
 570
 571 static inline void *dev_get_platdata(const struct device *dev)
 572 {
 573         return dev->platform_data;
 574 }
 575
 576 /*
 577  * Manual binding of a device to driver. See drivers/base/bus.c
 578  * for information on use.
 579  */
 580 extern int __must_check device_bind_driver(struct device *dev);
 581 extern void device_release_driver(struct device *dev);
 582 extern int  __must_check device_attach(struct device *dev);
 583 extern int __must_check driver_attach(struct device_driver *drv);
 584 extern int __must_check device_reprobe(struct device *dev);
 585
 586 /*
 587  * Easy functions for dynamically creating devices on the fly
 588  */
 589 extern struct device *device_create_vargs(struct class *cls,
 590                                           struct device *parent,
 591                                           dev_t devt,
 592                                           void *drvdata,
 593                                           const char *fmt,
 594                                           va_list vargs);
 595 extern struct device *device_create(struct class *cls, struct device *parent,
 596                                     dev_t devt, void *drvdata,
 597                                     const char *fmt, ...)
 598                                     __attribute__((format(printf, 5, 6)));
 599 extern void device_destroy(struct class *cls, dev_t devt);
 600
 601 /*
 602  * Platform "fixup" functions - allow the platform to have their say
 603  * about devices and actions that the general device layer doesn't
 604  * know about.
 605  */
 606 /* Notify platform of device discovery */
 607 extern int (*platform_notify)(struct device *dev);
 608
 609 extern int (*platform_notify_remove)(struct device *dev);
 610
 611
 612 /**
 613  * get_device - atomically increment the reference count for the device.
 614  *
 615  */
 616 extern struct device *get_device(struct device *dev);
 617 extern void put_device(struct device *dev);
 618
 619 extern void wait_for_device_probe(void);
 620
 621 #ifdef CONFIG_DEVTMPFS
 622 extern int devtmpfs_create_node(struct device *dev);
 623 extern int devtmpfs_delete_node(struct device *dev);
 624 extern int devtmpfs_mount(const char *mntdir);
 625 #else
 626 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 627 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
 628 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
 629 #endif
 630
 631 /* drivers/base/power/shutdown.c */
 632 extern void device_shutdown(void);
 633
 634 /* drivers/base/sys.c */
 635 extern void sysdev_shutdown(void);
 636
 637 /* debugging and troubleshooting/diagnostic helpers. */
 638 extern const char *dev_driver_string(const struct device *dev);
 639
 640
 641 #ifdef CONFIG_PRINTK
 642
 643 extern int dev_printk(const char *level, const struct device *dev,
 644                       const char *fmt, ...)
 645         __attribute__ ((format (printf, 3, 4)));
 646 extern int dev_emerg(const struct device *dev, const char *fmt, ...)
 647         __attribute__ ((format (printf, 2, 3)));
 648 extern int dev_alert(const struct device *dev, const char *fmt, ...)
 649         __attribute__ ((format (printf, 2, 3)));
 650 extern int dev_crit(const struct device *dev, const char *fmt, ...)
 651         __attribute__ ((format (printf, 2, 3)));
 652 extern int dev_err(const struct device *dev, const char *fmt, ...)
 653         __attribute__ ((format (printf, 2, 3)));
 654 extern int dev_warn(const struct device *dev, const char *fmt, ...)
 655         __attribute__ ((format (printf, 2, 3)));
 656 extern int dev_notice(const struct device *dev, const char *fmt, ...)
 657         __attribute__ ((format (printf, 2, 3)));
 658 extern int _dev_info(const struct device *dev, const char *fmt, ...)
 659         __attribute__ ((format (printf, 2, 3)));
 660
 661 #else
 662
 663 static inline int dev_printk(const char *level, const struct device *dev,
 664                       const char *fmt, ...)
 665         __attribute__ ((format (printf, 3, 4)));
 666 static inline int dev_printk(const char *level, const struct device *dev,
 667                       const char *fmt, ...)
 668          { return 0; }
 669
 670 static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
 671         __attribute__ ((format (printf, 2, 3)));
 672 static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
 673         { return 0; }
 674 static inline int dev_crit(const struct device *dev, const char *fmt, ...)
 675         __attribute__ ((format (printf, 2, 3)));
 676 static inline int dev_crit(const struct device *dev, const char *fmt, ...)
 677         { return 0; }
 678 static inline int dev_alert(const struct device *dev, const char *fmt, ...)
 679         __attribute__ ((format (printf, 2, 3)));
 680 static inline int dev_alert(const struct device *dev, const char *fmt, ...)
 681         { return 0; }
 682 static inline int dev_err(const struct device *dev, const char *fmt, ...)
 683         __attribute__ ((format (printf, 2, 3)));
 684 static inline int dev_err(const struct device *dev, const char *fmt, ...)
 685         { return 0; }
 686 static inline int dev_warn(const struct device *dev, const char *fmt, ...)
 687         __attribute__ ((format (printf, 2, 3)));
 688 static inline int dev_warn(const struct device *dev, const char *fmt, ...)
 689         { return 0; }
 690 static inline int dev_notice(const struct device *dev, const char *fmt, ...)
 691         __attribute__ ((format (printf, 2, 3)));
 692 static inline int dev_notice(const struct device *dev, const char *fmt, ...)
 693         { return 0; }
 694 static inline int _dev_info(const struct device *dev, const char *fmt, ...)
 695         __attribute__ ((format (printf, 2, 3)));
 696 static inline int _dev_info(const struct device *dev, const char *fmt, ...)
 697         { return 0; }
 698
 699 #endif
 700
 701 /*
 702  * Stupid hackaround for existing uses of non-printk uses dev_info
 703  *
 704  * Note that the definition of dev_info below is actually _dev_info
 705  * and a macro is used to avoid redefining dev_info
 706  */
 707
 708 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
 709
 710 #if defined(DEBUG)
 711 #define dev_dbg(dev, format, arg...)            \
 712         dev_printk(KERN_DEBUG, dev, format, ##arg)
 713 #elif defined(CONFIG_DYNAMIC_DEBUG)
 714 #define dev_dbg(dev, format, ...)                    \
 715 do {                                                 \
 716         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 717 } while (0)
 718 #else
 719 #define dev_dbg(dev, format, arg...)                            \
 720 ({                                                              \
 721         if (0)                                                  \
 722                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
 723         0;                                                      \
 724 })
 725 #endif
 726
 727 #ifdef VERBOSE_DEBUG
 728 #define dev_vdbg        dev_dbg
 729 #else
 730 #define dev_vdbg(dev, format, arg...)                           \
 731 ({                                                              \
 732         if (0)                                                  \
 733                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
 734         0;                                                      \
 735 })
 736 #endif
 737
 738 /*
 739  * dev_WARN() acts like dev_printk(), but with the key difference
 740  * of using a WARN/WARN_ON to get the message out, including the
 741  * file/line information and a backtrace.
 742  */
 743 #define dev_WARN(dev, format, arg...) \
 744         WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
 745
 746 /* Create alias, so I can be autoloaded. */
 747 #define MODULE_ALIAS_CHARDEV(major,minor) \
 748         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 749 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 750         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 751
 752 #ifdef CONFIG_SYSFS_DEPRECATED
 753 extern long sysfs_deprecated;
 754 #else
 755 #define sysfs_deprecated 0
 756 #endif
 757
 758 #endif /* _DEVICE_H_ */