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 bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
  88                      void *data, 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_BIND_DRIVER          0x00000003 /* driver about to be
 113                                                       bound */
 114 #define BUS_NOTIFY_BOUND_DRIVER         0x00000004 /* driver bound to device */
 115 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000005 /* driver about to be
 116                                                       unbound */
 117 #define BUS_NOTIFY_UNBOUND_DRIVER       0x00000006 /* driver is unbound
 118                                                       from the device */
 119
 120 extern struct kset *bus_get_kset(struct bus_type *bus);
 121 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 122
 123 struct device_driver {
 124         const char              *name;
 125         struct bus_type         *bus;
 126
 127         struct module           *owner;
 128         const char              *mod_name;      /* used for built-in modules */
 129
 130         bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
 131
 132 #if defined(CONFIG_OF)
 133         const struct of_device_id       *of_match_table;
 134 #endif
 135
 136         int (*probe) (struct device *dev);
 137         int (*remove) (struct device *dev);
 138         void (*shutdown) (struct device *dev);
 139         int (*suspend) (struct device *dev, pm_message_t state);
 140         int (*resume) (struct device *dev);
 141         const struct attribute_group **groups;
 142
 143         const struct dev_pm_ops *pm;
 144
 145         struct driver_private *p;
 146 };
 147
 148
 149 extern int __must_check driver_register(struct device_driver *drv);
 150 extern void driver_unregister(struct device_driver *drv);
 151
 152 extern struct device_driver *get_driver(struct device_driver *drv);
 153 extern void put_driver(struct device_driver *drv);
 154 extern struct device_driver *driver_find(const char *name,
 155                                          struct bus_type *bus);
 156 extern int driver_probe_done(void);
 157 extern void wait_for_device_probe(void);
 158
 159
 160 /* sysfs interface for exporting driver attributes */
 161
 162 struct driver_attribute {
 163         struct attribute attr;
 164         ssize_t (*show)(struct device_driver *driver, char *buf);
 165         ssize_t (*store)(struct device_driver *driver, const char *buf,
 166                          size_t count);
 167 };
 168
 169 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 170 struct driver_attribute driver_attr_##_name =           \
 171         __ATTR(_name, _mode, _show, _store)
 172
 173 extern int __must_check driver_create_file(struct device_driver *driver,
 174                                         const struct driver_attribute *attr);
 175 extern void driver_remove_file(struct device_driver *driver,
 176                                const struct driver_attribute *attr);
 177
 178 extern int __must_check driver_add_kobj(struct device_driver *drv,
 179                                         struct kobject *kobj,
 180                                         const char *fmt, ...);
 181
 182 extern int __must_check driver_for_each_device(struct device_driver *drv,
 183                                                struct device *start,
 184                                                void *data,
 185                                                int (*fn)(struct device *dev,
 186                                                          void *));
 187 struct device *driver_find_device(struct device_driver *drv,
 188                                   struct device *start, void *data,
 189                                   int (*match)(struct device *dev, void *data));
 190
 191 /*
 192  * device classes
 193  */
 194 struct class {
 195         const char              *name;
 196         struct module           *owner;
 197
 198         struct class_attribute          *class_attrs;
 199         struct device_attribute         *dev_attrs;
 200         struct kobject                  *dev_kobj;
 201
 202         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 203         char *(*devnode)(struct device *dev, mode_t *mode);
 204
 205         void (*class_release)(struct class *class);
 206         void (*dev_release)(struct device *dev);
 207
 208         int (*suspend)(struct device *dev, pm_message_t state);
 209         int (*resume)(struct device *dev);
 210
 211         const struct kobj_ns_type_operations *ns_type;
 212         const void *(*namespace)(struct device *dev);
 213
 214         const struct dev_pm_ops *pm;
 215
 216         struct class_private *p;
 217 };
 218
 219 struct class_dev_iter {
 220         struct klist_iter               ki;
 221         const struct device_type        *type;
 222 };
 223
 224 extern struct kobject *sysfs_dev_block_kobj;
 225 extern struct kobject *sysfs_dev_char_kobj;
 226 extern int __must_check __class_register(struct class *class,
 227                                          struct lock_class_key *key);
 228 extern void class_unregister(struct class *class);
 229
 230 /* This is a #define to keep the compiler from merging different
 231  * instances of the __key variable */
 232 #define class_register(class)                   \
 233 ({                                              \
 234         static struct lock_class_key __key;     \
 235         __class_register(class, &__key);        \
 236 })
 237
 238 struct class_compat;
 239 struct class_compat *class_compat_register(const char *name);
 240 void class_compat_unregister(struct class_compat *cls);
 241 int class_compat_create_link(struct class_compat *cls, struct device *dev,
 242                              struct device *device_link);
 243 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 244                               struct device *device_link);
 245
 246 extern void class_dev_iter_init(struct class_dev_iter *iter,
 247                                 struct class *class,
 248                                 struct device *start,
 249                                 const struct device_type *type);
 250 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 251 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 252
 253 extern int class_for_each_device(struct class *class, struct device *start,
 254                                  void *data,
 255                                  int (*fn)(struct device *dev, void *data));
 256 extern struct device *class_find_device(struct class *class,
 257                                         struct device *start, void *data,
 258                                         int (*match)(struct device *, void *));
 259
 260 struct class_attribute {
 261         struct attribute attr;
 262         ssize_t (*show)(struct class *class, struct class_attribute *attr,
 263                         char *buf);
 264         ssize_t (*store)(struct class *class, struct class_attribute *attr,
 265                         const char *buf, size_t count);
 266 };
 267
 268 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 269 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 270
 271 extern int __must_check class_create_file(struct class *class,
 272                                           const struct class_attribute *attr);
 273 extern void class_remove_file(struct class *class,
 274                               const struct class_attribute *attr);
 275
 276 /* Simple class attribute that is just a static string */
 277
 278 struct class_attribute_string {
 279         struct class_attribute attr;
 280         char *str;
 281 };
 282
 283 /* Currently read-only only */
 284 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
 285         { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
 286 #define CLASS_ATTR_STRING(_name, _mode, _str) \
 287         struct class_attribute_string class_attr_##_name = \
 288                 _CLASS_ATTR_STRING(_name, _mode, _str)
 289
 290 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
 291                         char *buf);
 292
 293 struct class_interface {
 294         struct list_head        node;
 295         struct class            *class;
 296
 297         int (*add_dev)          (struct device *, struct class_interface *);
 298         void (*remove_dev)      (struct device *, struct class_interface *);
 299 };
 300
 301 extern int __must_check class_interface_register(struct class_interface *);
 302 extern void class_interface_unregister(struct class_interface *);
 303
 304 extern struct class * __must_check __class_create(struct module *owner,
 305                                                   const char *name,
 306                                                   struct lock_class_key *key);
 307 extern void class_destroy(struct class *cls);
 308
 309 /* This is a #define to keep the compiler from merging different
 310  * instances of the __key variable */
 311 #define class_create(owner, name)               \
 312 ({                                              \
 313         static struct lock_class_key __key;     \
 314         __class_create(owner, name, &__key);    \
 315 })
 316
 317 /*
 318  * The type of device, "struct device" is embedded in. A class
 319  * or bus can contain devices of different types
 320  * like "partitions" and "disks", "mouse" and "event".
 321  * This identifies the device type and carries type-specific
 322  * information, equivalent to the kobj_type of a kobject.
 323  * If "name" is specified, the uevent will contain it in
 324  * the DEVTYPE variable.
 325  */
 326 struct device_type {
 327         const char *name;
 328         const struct attribute_group **groups;
 329         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 330         char *(*devnode)(struct device *dev, mode_t *mode);
 331         void (*release)(struct device *dev);
 332
 333         const struct dev_pm_ops *pm;
 334 };
 335
 336 /* interface for exporting device attributes */
 337 struct device_attribute {
 338         struct attribute        attr;
 339         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 340                         char *buf);
 341         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 342                          const char *buf, size_t count);
 343 };
 344
 345 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 346 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 347
 348 extern int __must_check device_create_file(struct device *device,
 349                                         const struct device_attribute *entry);
 350 extern void device_remove_file(struct device *dev,
 351                                const struct device_attribute *attr);
 352 extern int __must_check device_create_bin_file(struct device *dev,
 353                                         const struct bin_attribute *attr);
 354 extern void device_remove_bin_file(struct device *dev,
 355                                    const struct bin_attribute *attr);
 356 extern int device_schedule_callback_owner(struct device *dev,
 357                 void (*func)(struct device *dev), struct module *owner);
 358
 359 /* This is a macro to avoid include problems with THIS_MODULE */
 360 #define device_schedule_callback(dev, func)                     \
 361         device_schedule_callback_owner(dev, func, THIS_MODULE)
 362
 363 /* device resource management */
 364 typedef void (*dr_release_t)(struct device *dev, void *res);
 365 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 366
 367 #ifdef CONFIG_DEBUG_DEVRES
 368 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 369                              const char *name);
 370 #define devres_alloc(release, size, gfp) \
 371         __devres_alloc(release, size, gfp, #release)
 372 #else
 373 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 374 #endif
 375 extern void devres_free(void *res);
 376 extern void devres_add(struct device *dev, void *res);
 377 extern void *devres_find(struct device *dev, dr_release_t release,
 378                          dr_match_t match, void *match_data);
 379 extern void *devres_get(struct device *dev, void *new_res,
 380                         dr_match_t match, void *match_data);
 381 extern void *devres_remove(struct device *dev, dr_release_t release,
 382                            dr_match_t match, void *match_data);
 383 extern int devres_destroy(struct device *dev, dr_release_t release,
 384                           dr_match_t match, void *match_data);
 385
 386 /* devres group */
 387 extern void * __must_check devres_open_group(struct device *dev, void *id,
 388                                              gfp_t gfp);
 389 extern void devres_close_group(struct device *dev, void *id);
 390 extern void devres_remove_group(struct device *dev, void *id);
 391 extern int devres_release_group(struct device *dev, void *id);
 392
 393 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 394 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 395 extern void devm_kfree(struct device *dev, void *p);
 396
 397 struct device_dma_parameters {
 398         /*
 399          * a low level driver may set these to teach IOMMU code about
 400          * sg limitations.
 401          */
 402         unsigned int max_segment_size;
 403         unsigned long segment_boundary_mask;
 404 };
 405
 406 struct device {
 407         struct device           *parent;
 408
 409         struct device_private   *p;
 410
 411         struct kobject kobj;
 412         const char              *init_name; /* initial name of the device */
 413         struct device_type      *type;
 414
 415         struct mutex            mutex;  /* mutex to synchronize calls to
 416                                          * its driver.
 417                                          */
 418
 419         struct bus_type *bus;           /* type of bus device is on */
 420         struct device_driver *driver;   /* which driver has allocated this
 421                                            device */
 422         void            *platform_data; /* Platform specific data, device
 423                                            core doesn't touch it */
 424         struct dev_pm_info      power;
 425
 426 #ifdef CONFIG_NUMA
 427         int             numa_node;      /* NUMA node this device is close to */
 428 #endif
 429         u64             *dma_mask;      /* dma mask (if dma'able device) */
 430         u64             coherent_dma_mask;/* Like dma_mask, but for
 431                                              alloc_coherent mappings as
 432                                              not all hardware supports
 433                                              64 bit addresses for consistent
 434                                              allocations such descriptors. */
 435
 436         struct device_dma_parameters *dma_parms;
 437
 438         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 439
 440         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 441                                              override */
 442         /* arch specific additions */
 443         struct dev_archdata     archdata;
 444 #ifdef CONFIG_OF
 445         struct device_node      *of_node;
 446 #endif
 447
 448         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 449
 450         spinlock_t              devres_lock;
 451         struct list_head        devres_head;
 452
 453         struct klist_node       knode_class;
 454         struct class            *class;
 455         const struct attribute_group **groups;  /* optional groups */
 456
 457         void    (*release)(struct device *dev);
 458 };
 459
 460 /* Get the wakeup routines, which depend on struct device */
 461 #include <linux/pm_wakeup.h>
 462
 463 static inline const char *dev_name(const struct device *dev)
 464 {
 465         /* Use the init name until the kobject becomes available */
 466         if (dev->init_name)
 467                 return dev->init_name;
 468
 469         return kobject_name(&dev->kobj);
 470 }
 471
 472 extern int dev_set_name(struct device *dev, const char *name, ...)
 473                         __attribute__((format(printf, 2, 3)));
 474
 475 #ifdef CONFIG_NUMA
 476 static inline int dev_to_node(struct device *dev)
 477 {
 478         return dev->numa_node;
 479 }
 480 static inline void set_dev_node(struct device *dev, int node)
 481 {
 482         dev->numa_node = node;
 483 }
 484 #else
 485 static inline int dev_to_node(struct device *dev)
 486 {
 487         return -1;
 488 }
 489 static inline void set_dev_node(struct device *dev, int node)
 490 {
 491 }
 492 #endif
 493
 494 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 495 {
 496         return dev->kobj.uevent_suppress;
 497 }
 498
 499 static inline void dev_set_uevent_suppress(struct device *dev, int val)
 500 {
 501         dev->kobj.uevent_suppress = val;
 502 }
 503
 504 static inline int device_is_registered(struct device *dev)
 505 {
 506         return dev->kobj.state_in_sysfs;
 507 }
 508
 509 static inline void device_enable_async_suspend(struct device *dev)
 510 {
 511         if (dev->power.status == DPM_ON)
 512                 dev->power.async_suspend = true;
 513 }
 514
 515 static inline void device_disable_async_suspend(struct device *dev)
 516 {
 517         if (dev->power.status == DPM_ON)
 518                 dev->power.async_suspend = false;
 519 }
 520
 521 static inline bool device_async_suspend_enabled(struct device *dev)
 522 {
 523         return !!dev->power.async_suspend;
 524 }
 525
 526 static inline void device_lock(struct device *dev)
 527 {
 528         mutex_lock(&dev->mutex);
 529 }
 530
 531 static inline int device_trylock(struct device *dev)
 532 {
 533         return mutex_trylock(&dev->mutex);
 534 }
 535
 536 static inline void device_unlock(struct device *dev)
 537 {
 538         mutex_unlock(&dev->mutex);
 539 }
 540
 541 void driver_init(void);
 542
 543 /*
 544  * High level routines for use by the bus drivers
 545  */
 546 extern int __must_check device_register(struct device *dev);
 547 extern void device_unregister(struct device *dev);
 548 extern void device_initialize(struct device *dev);
 549 extern int __must_check device_add(struct device *dev);
 550 extern void device_del(struct device *dev);
 551 extern int device_for_each_child(struct device *dev, void *data,
 552                      int (*fn)(struct device *dev, void *data));
 553 extern struct device *device_find_child(struct device *dev, void *data,
 554                                 int (*match)(struct device *dev, void *data));
 555 extern int device_rename(struct device *dev, const char *new_name);
 556 extern int device_move(struct device *dev, struct device *new_parent,
 557                        enum dpm_order dpm_order);
 558 extern const char *device_get_devnode(struct device *dev,
 559                                       mode_t *mode, const char **tmp);
 560 extern void *dev_get_drvdata(const struct device *dev);
 561 extern void dev_set_drvdata(struct device *dev, void *data);
 562
 563 /*
 564  * Root device objects for grouping under /sys/devices
 565  */
 566 extern struct device *__root_device_register(const char *name,
 567                                              struct module *owner);
 568 static inline struct device *root_device_register(const char *name)
 569 {
 570         return __root_device_register(name, THIS_MODULE);
 571 }
 572 extern void root_device_unregister(struct device *root);
 573
 574 static inline void *dev_get_platdata(const struct device *dev)
 575 {
 576         return dev->platform_data;
 577 }
 578
 579 /*
 580  * Manual binding of a device to driver. See drivers/base/bus.c
 581  * for information on use.
 582  */
 583 extern int __must_check device_bind_driver(struct device *dev);
 584 extern void device_release_driver(struct device *dev);
 585 extern int  __must_check device_attach(struct device *dev);
 586 extern int __must_check driver_attach(struct device_driver *drv);
 587 extern int __must_check device_reprobe(struct device *dev);
 588
 589 /*
 590  * Easy functions for dynamically creating devices on the fly
 591  */
 592 extern struct device *device_create_vargs(struct class *cls,
 593                                           struct device *parent,
 594                                           dev_t devt,
 595                                           void *drvdata,
 596                                           const char *fmt,
 597                                           va_list vargs);
 598 extern struct device *device_create(struct class *cls, struct device *parent,
 599                                     dev_t devt, void *drvdata,
 600                                     const char *fmt, ...)
 601                                     __attribute__((format(printf, 5, 6)));
 602 extern void device_destroy(struct class *cls, dev_t devt);
 603
 604 /*
 605  * Platform "fixup" functions - allow the platform to have their say
 606  * about devices and actions that the general device layer doesn't
 607  * know about.
 608  */
 609 /* Notify platform of device discovery */
 610 extern int (*platform_notify)(struct device *dev);
 611
 612 extern int (*platform_notify_remove)(struct device *dev);
 613
 614
 615 /**
 616  * get_device - atomically increment the reference count for the device.
 617  *
 618  */
 619 extern struct device *get_device(struct device *dev);
 620 extern void put_device(struct device *dev);
 621
 622 extern void wait_for_device_probe(void);
 623
 624 #ifdef CONFIG_DEVTMPFS
 625 extern int devtmpfs_create_node(struct device *dev);
 626 extern int devtmpfs_delete_node(struct device *dev);
 627 extern int devtmpfs_mount(const char *mntdir);
 628 #else
 629 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 630 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
 631 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
 632 #endif
 633
 634 /* drivers/base/power/shutdown.c */
 635 extern void device_shutdown(void);
 636
 637 /* drivers/base/sys.c */
 638 extern void sysdev_shutdown(void);
 639
 640 /* debugging and troubleshooting/diagnostic helpers. */
 641 extern const char *dev_driver_string(const struct device *dev);
 642
 643
 644 #ifdef CONFIG_PRINTK
 645
 646 extern int dev_printk(const char *level, const struct device *dev,
 647                       const char *fmt, ...)
 648         __attribute__ ((format (printf, 3, 4)));
 649 extern int dev_emerg(const struct device *dev, const char *fmt, ...)
 650         __attribute__ ((format (printf, 2, 3)));
 651 extern int dev_alert(const struct device *dev, const char *fmt, ...)
 652         __attribute__ ((format (printf, 2, 3)));
 653 extern int dev_crit(const struct device *dev, const char *fmt, ...)
 654         __attribute__ ((format (printf, 2, 3)));
 655 extern int dev_err(const struct device *dev, const char *fmt, ...)
 656         __attribute__ ((format (printf, 2, 3)));
 657 extern int dev_warn(const struct device *dev, const char *fmt, ...)
 658         __attribute__ ((format (printf, 2, 3)));
 659 extern int dev_notice(const struct device *dev, const char *fmt, ...)
 660         __attribute__ ((format (printf, 2, 3)));
 661 extern int _dev_info(const struct device *dev, const char *fmt, ...)
 662         __attribute__ ((format (printf, 2, 3)));
 663
 664 #else
 665
 666 static inline int dev_printk(const char *level, const struct device *dev,
 667                       const char *fmt, ...)
 668         __attribute__ ((format (printf, 3, 4)));
 669 static inline int dev_printk(const char *level, const struct device *dev,
 670                       const char *fmt, ...)
 671          { return 0; }
 672
 673 static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
 674         __attribute__ ((format (printf, 2, 3)));
 675 static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
 676         { return 0; }
 677 static inline int dev_crit(const struct device *dev, const char *fmt, ...)
 678         __attribute__ ((format (printf, 2, 3)));
 679 static inline int dev_crit(const struct device *dev, const char *fmt, ...)
 680         { return 0; }
 681 static inline int dev_alert(const struct device *dev, const char *fmt, ...)
 682         __attribute__ ((format (printf, 2, 3)));
 683 static inline int dev_alert(const struct device *dev, const char *fmt, ...)
 684         { return 0; }
 685 static inline int dev_err(const struct device *dev, const char *fmt, ...)
 686         __attribute__ ((format (printf, 2, 3)));
 687 static inline int dev_err(const struct device *dev, const char *fmt, ...)
 688         { return 0; }
 689 static inline int dev_warn(const struct device *dev, const char *fmt, ...)
 690         __attribute__ ((format (printf, 2, 3)));
 691 static inline int dev_warn(const struct device *dev, const char *fmt, ...)
 692         { return 0; }
 693 static inline int dev_notice(const struct device *dev, const char *fmt, ...)
 694         __attribute__ ((format (printf, 2, 3)));
 695 static inline int dev_notice(const struct device *dev, const char *fmt, ...)
 696         { return 0; }
 697 static inline int _dev_info(const struct device *dev, const char *fmt, ...)
 698         __attribute__ ((format (printf, 2, 3)));
 699 static inline int _dev_info(const struct device *dev, const char *fmt, ...)
 700         { return 0; }
 701
 702 #endif
 703
 704 /*
 705  * Stupid hackaround for existing uses of non-printk uses dev_info
 706  *
 707  * Note that the definition of dev_info below is actually _dev_info
 708  * and a macro is used to avoid redefining dev_info
 709  */
 710
 711 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
 712
 713 #if defined(DEBUG)
 714 #define dev_dbg(dev, format, arg...)            \
 715         dev_printk(KERN_DEBUG, dev, format, ##arg)
 716 #elif defined(CONFIG_DYNAMIC_DEBUG)
 717 #define dev_dbg(dev, format, ...)                    \
 718 do {                                                 \
 719         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 720 } while (0)
 721 #else
 722 #define dev_dbg(dev, format, arg...)                            \
 723 ({                                                              \
 724         if (0)                                                  \
 725                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
 726         0;                                                      \
 727 })
 728 #endif
 729
 730 #ifdef VERBOSE_DEBUG
 731 #define dev_vdbg        dev_dbg
 732 #else
 733 #define dev_vdbg(dev, format, arg...)                           \
 734 ({                                                              \
 735         if (0)                                                  \
 736                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
 737         0;                                                      \
 738 })
 739 #endif
 740
 741 /*
 742  * dev_WARN() acts like dev_printk(), but with the key difference
 743  * of using a WARN/WARN_ON to get the message out, including the
 744  * file/line information and a backtrace.
 745  */
 746 #define dev_WARN(dev, format, arg...) \
 747         WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
 748
 749 /* Create alias, so I can be autoloaded. */
 750 #define MODULE_ALIAS_CHARDEV(major,minor) \
 751         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 752 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 753         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 754 #endif /* _DEVICE_H_ */