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_BOUND_DRIVER         0x00000003 /* driver bound to device */
 113 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 114                                                       unbound */
 115 #define BUS_NOTIFY_UNBOUND_DRIVER       0x00000005 /* driver is unbound
 116                                                       from the device */
 117
 118 extern struct kset *bus_get_kset(struct bus_type *bus);
 119 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 120
 121 struct device_driver {
 122         const char              *name;
 123         struct bus_type         *bus;
 124
 125         struct module           *owner;
 126         const char              *mod_name;      /* used for built-in modules */
 127
 128         bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
 129
 130 #if defined(CONFIG_OF)
 131         const struct of_device_id       *of_match_table;
 132 #endif
 133
 134         int (*probe) (struct device *dev);
 135         int (*remove) (struct device *dev);
 136         void (*shutdown) (struct device *dev);
 137         int (*suspend) (struct device *dev, pm_message_t state);
 138         int (*resume) (struct device *dev);
 139         const struct attribute_group **groups;
 140
 141         const struct dev_pm_ops *pm;
 142
 143         struct driver_private *p;
 144 };
 145
 146
 147 extern int __must_check driver_register(struct device_driver *drv);
 148 extern void driver_unregister(struct device_driver *drv);
 149
 150 extern struct device_driver *get_driver(struct device_driver *drv);
 151 extern void put_driver(struct device_driver *drv);
 152 extern struct device_driver *driver_find(const char *name,
 153                                          struct bus_type *bus);
 154 extern int driver_probe_done(void);
 155 extern void wait_for_device_probe(void);
 156
 157
 158 /* sysfs interface for exporting driver attributes */
 159
 160 struct driver_attribute {
 161         struct attribute attr;
 162         ssize_t (*show)(struct device_driver *driver, char *buf);
 163         ssize_t (*store)(struct device_driver *driver, const char *buf,
 164                          size_t count);
 165 };
 166
 167 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 168 struct driver_attribute driver_attr_##_name =           \
 169         __ATTR(_name, _mode, _show, _store)
 170
 171 extern int __must_check driver_create_file(struct device_driver *driver,
 172                                         const struct driver_attribute *attr);
 173 extern void driver_remove_file(struct device_driver *driver,
 174                                const struct driver_attribute *attr);
 175
 176 extern int __must_check driver_add_kobj(struct device_driver *drv,
 177                                         struct kobject *kobj,
 178                                         const char *fmt, ...);
 179
 180 extern int __must_check driver_for_each_device(struct device_driver *drv,
 181                                                struct device *start,
 182                                                void *data,
 183                                                int (*fn)(struct device *dev,
 184                                                          void *));
 185 struct device *driver_find_device(struct device_driver *drv,
 186                                   struct device *start, void *data,
 187                                   int (*match)(struct device *dev, void *data));
 188
 189 /*
 190  * device classes
 191  */
 192 struct class {
 193         const char              *name;
 194         struct module           *owner;
 195
 196         struct class_attribute          *class_attrs;
 197         struct device_attribute         *dev_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 class_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 #ifdef CONFIG_OF
 443         struct device_node      *of_node;
 444 #endif
 445
 446         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 447
 448         spinlock_t              devres_lock;
 449         struct list_head        devres_head;
 450
 451         struct klist_node       knode_class;
 452         struct class            *class;
 453         const struct attribute_group **groups;  /* optional groups */
 454
 455         void    (*release)(struct device *dev);
 456 };
 457
 458 /* Get the wakeup routines, which depend on struct device */
 459 #include <linux/pm_wakeup.h>
 460
 461 static inline const char *dev_name(const struct device *dev)
 462 {
 463         /* Use the init name until the kobject becomes available */
 464         if (dev->init_name)
 465                 return dev->init_name;
 466
 467         return kobject_name(&dev->kobj);
 468 }
 469
 470 extern int dev_set_name(struct device *dev, const char *name, ...)
 471                         __attribute__((format(printf, 2, 3)));
 472
 473 #ifdef CONFIG_NUMA
 474 static inline int dev_to_node(struct device *dev)
 475 {
 476         return dev->numa_node;
 477 }
 478 static inline void set_dev_node(struct device *dev, int node)
 479 {
 480         dev->numa_node = node;
 481 }
 482 #else
 483 static inline int dev_to_node(struct device *dev)
 484 {
 485         return -1;
 486 }
 487 static inline void set_dev_node(struct device *dev, int node)
 488 {
 489 }
 490 #endif
 491
 492 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 493 {
 494         return dev->kobj.uevent_suppress;
 495 }
 496
 497 static inline void dev_set_uevent_suppress(struct device *dev, int val)
 498 {
 499         dev->kobj.uevent_suppress = val;
 500 }
 501
 502 static inline int device_is_registered(struct device *dev)
 503 {
 504         return dev->kobj.state_in_sysfs;
 505 }
 506
 507 static inline void device_enable_async_suspend(struct device *dev)
 508 {
 509         if (dev->power.status == DPM_ON)
 510                 dev->power.async_suspend = true;
 511 }
 512
 513 static inline void device_disable_async_suspend(struct device *dev)
 514 {
 515         if (dev->power.status == DPM_ON)
 516                 dev->power.async_suspend = false;
 517 }
 518
 519 static inline bool device_async_suspend_enabled(struct device *dev)
 520 {
 521         return !!dev->power.async_suspend;
 522 }
 523
 524 static inline void device_lock(struct device *dev)
 525 {
 526         mutex_lock(&dev->mutex);
 527 }
 528
 529 static inline int device_trylock(struct device *dev)
 530 {
 531         return mutex_trylock(&dev->mutex);
 532 }
 533
 534 static inline void device_unlock(struct device *dev)
 535 {
 536         mutex_unlock(&dev->mutex);
 537 }
 538
 539 void driver_init(void);
 540
 541 /*
 542  * High level routines for use by the bus drivers
 543  */
 544 extern int __must_check device_register(struct device *dev);
 545 extern void device_unregister(struct device *dev);
 546 extern void device_initialize(struct device *dev);
 547 extern int __must_check device_add(struct device *dev);
 548 extern void device_del(struct device *dev);
 549 extern int device_for_each_child(struct device *dev, void *data,
 550                      int (*fn)(struct device *dev, void *data));
 551 extern struct device *device_find_child(struct device *dev, void *data,
 552                                 int (*match)(struct device *dev, void *data));
 553 extern int device_rename(struct device *dev, char *new_name);
 554 extern int device_move(struct device *dev, struct device *new_parent,
 555                        enum dpm_order dpm_order);
 556 extern const char *device_get_devnode(struct device *dev,
 557                                       mode_t *mode, const char **tmp);
 558 extern void *dev_get_drvdata(const struct device *dev);
 559 extern void dev_set_drvdata(struct device *dev, void *data);
 560
 561 /*
 562  * Root device objects for grouping under /sys/devices
 563  */
 564 extern struct device *__root_device_register(const char *name,
 565                                              struct module *owner);
 566 static inline struct device *root_device_register(const char *name)
 567 {
 568         return __root_device_register(name, THIS_MODULE);
 569 }
 570 extern void root_device_unregister(struct device *root);
 571
 572 static inline void *dev_get_platdata(const struct device *dev)
 573 {
 574         return dev->platform_data;
 575 }
 576
 577 /*
 578  * Manual binding of a device to driver. See drivers/base/bus.c
 579  * for information on use.
 580  */
 581 extern int __must_check device_bind_driver(struct device *dev);
 582 extern void device_release_driver(struct device *dev);
 583 extern int  __must_check device_attach(struct device *dev);
 584 extern int __must_check driver_attach(struct device_driver *drv);
 585 extern int __must_check device_reprobe(struct device *dev);
 586
 587 /*
 588  * Easy functions for dynamically creating devices on the fly
 589  */
 590 extern struct device *device_create_vargs(struct class *cls,
 591                                           struct device *parent,
 592                                           dev_t devt,
 593                                           void *drvdata,
 594                                           const char *fmt,
 595                                           va_list vargs);
 596 extern struct device *device_create(struct class *cls, struct device *parent,
 597                                     dev_t devt, void *drvdata,
 598                                     const char *fmt, ...)
 599                                     __attribute__((format(printf, 5, 6)));
 600 extern void device_destroy(struct class *cls, dev_t devt);
 601
 602 /*
 603  * Platform "fixup" functions - allow the platform to have their say
 604  * about devices and actions that the general device layer doesn't
 605  * know about.
 606  */
 607 /* Notify platform of device discovery */
 608 extern int (*platform_notify)(struct device *dev);
 609
 610 extern int (*platform_notify_remove)(struct device *dev);
 611
 612
 613 /**
 614  * get_device - atomically increment the reference count for the device.
 615  *
 616  */
 617 extern struct device *get_device(struct device *dev);
 618 extern void put_device(struct device *dev);
 619
 620 extern void wait_for_device_probe(void);
 621
 622 #ifdef CONFIG_DEVTMPFS
 623 extern int devtmpfs_create_node(struct device *dev);
 624 extern int devtmpfs_delete_node(struct device *dev);
 625 extern int devtmpfs_mount(const char *mntdir);
 626 #else
 627 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 628 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
 629 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
 630 #endif
 631
 632 /* drivers/base/power/shutdown.c */
 633 extern void device_shutdown(void);
 634
 635 /* drivers/base/sys.c */
 636 extern void sysdev_shutdown(void);
 637
 638 /* debugging and troubleshooting/diagnostic helpers. */
 639 extern const char *dev_driver_string(const struct device *dev);
 640
 641
 642 #ifdef CONFIG_PRINTK
 643
 644 extern int dev_printk(const char *level, const struct device *dev,
 645                       const char *fmt, ...)
 646         __attribute__ ((format (printf, 3, 4)));
 647 extern int dev_emerg(const struct device *dev, const char *fmt, ...)
 648         __attribute__ ((format (printf, 2, 3)));
 649 extern int dev_alert(const struct device *dev, const char *fmt, ...)
 650         __attribute__ ((format (printf, 2, 3)));
 651 extern int dev_crit(const struct device *dev, const char *fmt, ...)
 652         __attribute__ ((format (printf, 2, 3)));
 653 extern int dev_err(const struct device *dev, const char *fmt, ...)
 654         __attribute__ ((format (printf, 2, 3)));
 655 extern int dev_warn(const struct device *dev, const char *fmt, ...)
 656         __attribute__ ((format (printf, 2, 3)));
 657 extern int dev_notice(const struct device *dev, const char *fmt, ...)
 658         __attribute__ ((format (printf, 2, 3)));
 659 extern int _dev_info(const struct device *dev, const char *fmt, ...)
 660         __attribute__ ((format (printf, 2, 3)));
 661
 662 #else
 663
 664 static inline int dev_printk(const char *level, const struct device *dev,
 665                       const char *fmt, ...)
 666         __attribute__ ((format (printf, 3, 4)));
 667 static inline int dev_printk(const char *level, const struct device *dev,
 668                       const char *fmt, ...)
 669          { return 0; }
 670
 671 static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
 672         __attribute__ ((format (printf, 2, 3)));
 673 static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
 674         { return 0; }
 675 static inline int dev_crit(const struct device *dev, const char *fmt, ...)
 676         __attribute__ ((format (printf, 2, 3)));
 677 static inline int dev_crit(const struct device *dev, const char *fmt, ...)
 678         { return 0; }
 679 static inline int dev_alert(const struct device *dev, const char *fmt, ...)
 680         __attribute__ ((format (printf, 2, 3)));
 681 static inline int dev_alert(const struct device *dev, const char *fmt, ...)
 682         { return 0; }
 683 static inline int dev_err(const struct device *dev, const char *fmt, ...)
 684         __attribute__ ((format (printf, 2, 3)));
 685 static inline int dev_err(const struct device *dev, const char *fmt, ...)
 686         { return 0; }
 687 static inline int dev_warn(const struct device *dev, const char *fmt, ...)
 688         __attribute__ ((format (printf, 2, 3)));
 689 static inline int dev_warn(const struct device *dev, const char *fmt, ...)
 690         { return 0; }
 691 static inline int dev_notice(const struct device *dev, const char *fmt, ...)
 692         __attribute__ ((format (printf, 2, 3)));
 693 static inline int dev_notice(const struct device *dev, const char *fmt, ...)
 694         { return 0; }
 695 static inline int _dev_info(const struct device *dev, const char *fmt, ...)
 696         __attribute__ ((format (printf, 2, 3)));
 697 static inline int _dev_info(const struct device *dev, const char *fmt, ...)
 698         { return 0; }
 699
 700 #endif
 701
 702 /*
 703  * Stupid hackaround for existing uses of non-printk uses dev_info
 704  *
 705  * Note that the definition of dev_info below is actually _dev_info
 706  * and a macro is used to avoid redefining dev_info
 707  */
 708
 709 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
 710
 711 #if defined(DEBUG)
 712 #define dev_dbg(dev, format, arg...)            \
 713         dev_printk(KERN_DEBUG, dev, format, ##arg)
 714 #elif defined(CONFIG_DYNAMIC_DEBUG)
 715 #define dev_dbg(dev, format, ...)                    \
 716 do {                                                 \
 717         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 718 } while (0)
 719 #else
 720 #define dev_dbg(dev, format, arg...)                            \
 721 ({                                                              \
 722         if (0)                                                  \
 723                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
 724         0;                                                      \
 725 })
 726 #endif
 727
 728 #ifdef VERBOSE_DEBUG
 729 #define dev_vdbg        dev_dbg
 730 #else
 731 #define dev_vdbg(dev, format, arg...)                           \
 732 ({                                                              \
 733         if (0)                                                  \
 734                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
 735         0;                                                      \
 736 })
 737 #endif
 738
 739 /*
 740  * dev_WARN() acts like dev_printk(), but with the key difference
 741  * of using a WARN/WARN_ON to get the message out, including the
 742  * file/line information and a backtrace.
 743  */
 744 #define dev_WARN(dev, format, arg...) \
 745         WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
 746
 747 /* Create alias, so I can be autoloaded. */
 748 #define MODULE_ALIAS_CHARDEV(major,minor) \
 749         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 750 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 751         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 752 #endif /* _DEVICE_H_ */