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) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de>
   6  *
   7  * This file is released under the GPLv2
   8  *
   9  * See Documentation/driver-model/ for more information.
  10  */
  11
  12 #ifndef _DEVICE_H_
  13 #define _DEVICE_H_
  14
  15 #include <linux/ioport.h>
  16 #include <linux/kobject.h>
  17 #include <linux/klist.h>
  18 #include <linux/list.h>
  19 #include <linux/lockdep.h>
  20 #include <linux/compiler.h>
  21 #include <linux/types.h>
  22 #include <linux/module.h>
  23 #include <linux/pm.h>
  24 #include <linux/semaphore.h>
  25 #include <asm/atomic.h>
  26 #include <asm/device.h>
  27
  28 #define BUS_ID_SIZE             20
  29
  30 struct device;
  31 struct device_private;
  32 struct device_driver;
  33 struct driver_private;
  34 struct class;
  35 struct class_private;
  36 struct bus_type;
  37 struct bus_type_private;
  38
  39 struct bus_attribute {
  40         struct attribute        attr;
  41         ssize_t (*show)(struct bus_type *bus, char *buf);
  42         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  43 };
  44
  45 #define BUS_ATTR(_name, _mode, _show, _store)   \
  46 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  47
  48 extern int __must_check bus_create_file(struct bus_type *,
  49                                         struct bus_attribute *);
  50 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  51
  52 struct bus_type {
  53         const char              *name;
  54         struct bus_attribute    *bus_attrs;
  55         struct device_attribute *dev_attrs;
  56         struct driver_attribute *drv_attrs;
  57
  58         int (*match)(struct device *dev, struct device_driver *drv);
  59         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  60         int (*probe)(struct device *dev);
  61         int (*remove)(struct device *dev);
  62         void (*shutdown)(struct device *dev);
  63
  64         int (*suspend)(struct device *dev, pm_message_t state);
  65         int (*suspend_late)(struct device *dev, pm_message_t state);
  66         int (*resume_early)(struct device *dev);
  67         int (*resume)(struct device *dev);
  68
  69         struct dev_pm_ops *pm;
  70
  71         struct bus_type_private *p;
  72 };
  73
  74 extern int __must_check bus_register(struct bus_type *bus);
  75 extern void bus_unregister(struct bus_type *bus);
  76
  77 extern int __must_check bus_rescan_devices(struct bus_type *bus);
  78
  79 /* iterator helpers for buses */
  80
  81 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
  82                      int (*fn)(struct device *dev, void *data));
  83 struct device *bus_find_device(struct bus_type *bus, struct device *start,
  84                                void *data,
  85                                int (*match)(struct device *dev, void *data));
  86 struct device *bus_find_device_by_name(struct bus_type *bus,
  87                                        struct device *start,
  88                                        const char *name);
  89
  90 int __must_check bus_for_each_drv(struct bus_type *bus,
  91                                   struct device_driver *start, void *data,
  92                                   int (*fn)(struct device_driver *, void *));
  93
  94 void bus_sort_breadthfirst(struct bus_type *bus,
  95                            int (*compare)(const struct device *a,
  96                                           const struct device *b));
  97 /*
  98  * Bus notifiers: Get notified of addition/removal of devices
  99  * and binding/unbinding of drivers to devices.
 100  * In the long run, it should be a replacement for the platform
 101  * notify hooks.
 102  */
 103 struct notifier_block;
 104
 105 extern int bus_register_notifier(struct bus_type *bus,
 106                                  struct notifier_block *nb);
 107 extern int bus_unregister_notifier(struct bus_type *bus,
 108                                    struct notifier_block *nb);
 109
 110 /* All 4 notifers below get called with the target struct device *
 111  * as an argument. Note that those functions are likely to be called
 112  * with the device semaphore held in the core, so be careful.
 113  */
 114 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 115 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 116 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 117 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 118                                                       unbound */
 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         int (*probe) (struct device *dev);
 131         int (*remove) (struct device *dev);
 132         void (*shutdown) (struct device *dev);
 133         int (*suspend) (struct device *dev, pm_message_t state);
 134         int (*resume) (struct device *dev);
 135         struct attribute_group **groups;
 136
 137         struct dev_pm_ops *pm;
 138
 139         struct driver_private *p;
 140 };
 141
 142
 143 extern int __must_check driver_register(struct device_driver *drv);
 144 extern void driver_unregister(struct device_driver *drv);
 145
 146 extern struct device_driver *get_driver(struct device_driver *drv);
 147 extern void put_driver(struct device_driver *drv);
 148 extern struct device_driver *driver_find(const char *name,
 149                                          struct bus_type *bus);
 150 extern int driver_probe_done(void);
 151
 152 /* sysfs interface for exporting driver attributes */
 153
 154 struct driver_attribute {
 155         struct attribute attr;
 156         ssize_t (*show)(struct device_driver *driver, char *buf);
 157         ssize_t (*store)(struct device_driver *driver, const char *buf,
 158                          size_t count);
 159 };
 160
 161 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 162 struct driver_attribute driver_attr_##_name =           \
 163         __ATTR(_name, _mode, _show, _store)
 164
 165 extern int __must_check driver_create_file(struct device_driver *driver,
 166                                            struct driver_attribute *attr);
 167 extern void driver_remove_file(struct device_driver *driver,
 168                                struct driver_attribute *attr);
 169
 170 extern int __must_check driver_add_kobj(struct device_driver *drv,
 171                                         struct kobject *kobj,
 172                                         const char *fmt, ...);
 173
 174 extern int __must_check driver_for_each_device(struct device_driver *drv,
 175                                                struct device *start,
 176                                                void *data,
 177                                                int (*fn)(struct device *dev,
 178                                                          void *));
 179 struct device *driver_find_device(struct device_driver *drv,
 180                                   struct device *start, void *data,
 181                                   int (*match)(struct device *dev, void *data));
 182
 183 /*
 184  * device classes
 185  */
 186 struct class {
 187         const char              *name;
 188         struct module           *owner;
 189
 190         struct class_attribute          *class_attrs;
 191         struct device_attribute         *dev_attrs;
 192         struct kobject                  *dev_kobj;
 193
 194         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 195
 196         void (*class_release)(struct class *class);
 197         void (*dev_release)(struct device *dev);
 198
 199         int (*suspend)(struct device *dev, pm_message_t state);
 200         int (*resume)(struct device *dev);
 201
 202         struct dev_pm_ops *pm;
 203         struct class_private *p;
 204 };
 205
 206 struct class_dev_iter {
 207         struct klist_iter               ki;
 208         const struct device_type        *type;
 209 };
 210
 211 extern struct kobject *sysfs_dev_block_kobj;
 212 extern struct kobject *sysfs_dev_char_kobj;
 213 extern int __must_check __class_register(struct class *class,
 214                                          struct lock_class_key *key);
 215 extern void class_unregister(struct class *class);
 216
 217 /* This is a #define to keep the compiler from merging different
 218  * instances of the __key variable */
 219 #define class_register(class)                   \
 220 ({                                              \
 221         static struct lock_class_key __key;     \
 222         __class_register(class, &__key);        \
 223 })
 224
 225 extern void class_dev_iter_init(struct class_dev_iter *iter,
 226                                 struct class *class,
 227                                 struct device *start,
 228                                 const struct device_type *type);
 229 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 230 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 231
 232 extern int class_for_each_device(struct class *class, struct device *start,
 233                                  void *data,
 234                                  int (*fn)(struct device *dev, void *data));
 235 extern struct device *class_find_device(struct class *class,
 236                                         struct device *start, void *data,
 237                                         int (*match)(struct device *, void *));
 238
 239 struct class_attribute {
 240         struct attribute attr;
 241         ssize_t (*show)(struct class *class, char *buf);
 242         ssize_t (*store)(struct class *class, const char *buf, size_t count);
 243 };
 244
 245 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 246 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 247
 248 extern int __must_check class_create_file(struct class *class,
 249                                           const struct class_attribute *attr);
 250 extern void class_remove_file(struct class *class,
 251                               const struct class_attribute *attr);
 252
 253 struct class_interface {
 254         struct list_head        node;
 255         struct class            *class;
 256
 257         int (*add_dev)          (struct device *, struct class_interface *);
 258         void (*remove_dev)      (struct device *, struct class_interface *);
 259 };
 260
 261 extern int __must_check class_interface_register(struct class_interface *);
 262 extern void class_interface_unregister(struct class_interface *);
 263
 264 extern struct class * __must_check __class_create(struct module *owner,
 265                                                   const char *name,
 266                                                   struct lock_class_key *key);
 267 extern void class_destroy(struct class *cls);
 268
 269 /* This is a #define to keep the compiler from merging different
 270  * instances of the __key variable */
 271 #define class_create(owner, name)               \
 272 ({                                              \
 273         static struct lock_class_key __key;     \
 274         __class_create(owner, name, &__key);    \
 275 })
 276
 277 /*
 278  * The type of device, "struct device" is embedded in. A class
 279  * or bus can contain devices of different types
 280  * like "partitions" and "disks", "mouse" and "event".
 281  * This identifies the device type and carries type-specific
 282  * information, equivalent to the kobj_type of a kobject.
 283  * If "name" is specified, the uevent will contain it in
 284  * the DEVTYPE variable.
 285  */
 286 struct device_type {
 287         const char *name;
 288         struct attribute_group **groups;
 289         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 290         void (*release)(struct device *dev);
 291
 292         int (*suspend)(struct device *dev, pm_message_t state);
 293         int (*resume)(struct device *dev);
 294
 295         struct dev_pm_ops *pm;
 296 };
 297
 298 /* interface for exporting device attributes */
 299 struct device_attribute {
 300         struct attribute        attr;
 301         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 302                         char *buf);
 303         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 304                          const char *buf, size_t count);
 305 };
 306
 307 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 308 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 309
 310 extern int __must_check device_create_file(struct device *device,
 311                                            struct device_attribute *entry);
 312 extern void device_remove_file(struct device *dev,
 313                                struct device_attribute *attr);
 314 extern int __must_check device_create_bin_file(struct device *dev,
 315                                                struct bin_attribute *attr);
 316 extern void device_remove_bin_file(struct device *dev,
 317                                    struct bin_attribute *attr);
 318 extern int device_schedule_callback_owner(struct device *dev,
 319                 void (*func)(struct device *dev), struct module *owner);
 320
 321 /* This is a macro to avoid include problems with THIS_MODULE */
 322 #define device_schedule_callback(dev, func)                     \
 323         device_schedule_callback_owner(dev, func, THIS_MODULE)
 324
 325 /* device resource management */
 326 typedef void (*dr_release_t)(struct device *dev, void *res);
 327 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 328
 329 #ifdef CONFIG_DEBUG_DEVRES
 330 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 331                              const char *name);
 332 #define devres_alloc(release, size, gfp) \
 333         __devres_alloc(release, size, gfp, #release)
 334 #else
 335 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 336 #endif
 337 extern void devres_free(void *res);
 338 extern void devres_add(struct device *dev, void *res);
 339 extern void *devres_find(struct device *dev, dr_release_t release,
 340                          dr_match_t match, void *match_data);
 341 extern void *devres_get(struct device *dev, void *new_res,
 342                         dr_match_t match, void *match_data);
 343 extern void *devres_remove(struct device *dev, dr_release_t release,
 344                            dr_match_t match, void *match_data);
 345 extern int devres_destroy(struct device *dev, dr_release_t release,
 346                           dr_match_t match, void *match_data);
 347
 348 /* devres group */
 349 extern void * __must_check devres_open_group(struct device *dev, void *id,
 350                                              gfp_t gfp);
 351 extern void devres_close_group(struct device *dev, void *id);
 352 extern void devres_remove_group(struct device *dev, void *id);
 353 extern int devres_release_group(struct device *dev, void *id);
 354
 355 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 356 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 357 extern void devm_kfree(struct device *dev, void *p);
 358
 359 struct device_dma_parameters {
 360         /*
 361          * a low level driver may set these to teach IOMMU code about
 362          * sg limitations.
 363          */
 364         unsigned int max_segment_size;
 365         unsigned long segment_boundary_mask;
 366 };
 367
 368 struct device {
 369         struct device           *parent;
 370
 371         struct device_private   *p;
 372
 373         struct kobject kobj;
 374         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 375         unsigned                uevent_suppress:1;
 376         const char              *init_name; /* initial name of the device */
 377         struct device_type      *type;
 378
 379         struct semaphore        sem;    /* semaphore to synchronize calls to
 380                                          * its driver.
 381                                          */
 382
 383         struct bus_type *bus;           /* type of bus device is on */
 384         struct device_driver *driver;   /* which driver has allocated this
 385                                            device */
 386         void            *driver_data;   /* data private to the driver */
 387         void            *platform_data; /* Platform specific data, device
 388                                            core doesn't touch it */
 389         struct dev_pm_info      power;
 390
 391 #ifdef CONFIG_NUMA
 392         int             numa_node;      /* NUMA node this device is close to */
 393 #endif
 394         u64             *dma_mask;      /* dma mask (if dma'able device) */
 395         u64             coherent_dma_mask;/* Like dma_mask, but for
 396                                              alloc_coherent mappings as
 397                                              not all hardware supports
 398                                              64 bit addresses for consistent
 399                                              allocations such descriptors. */
 400
 401         struct device_dma_parameters *dma_parms;
 402
 403         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 404
 405         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 406                                              override */
 407         /* arch specific additions */
 408         struct dev_archdata     archdata;
 409
 410         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 411
 412         spinlock_t              devres_lock;
 413         struct list_head        devres_head;
 414
 415         struct klist_node       knode_class;
 416         struct class            *class;
 417         struct attribute_group  **groups;       /* optional groups */
 418
 419         void    (*release)(struct device *dev);
 420 };
 421
 422 /* Get the wakeup routines, which depend on struct device */
 423 #include <linux/pm_wakeup.h>
 424
 425 static inline const char *dev_name(const struct device *dev)
 426 {
 427         /* will be changed into kobject_name(&dev->kobj) in the near future */
 428         return dev->bus_id;
 429 }
 430
 431 extern int dev_set_name(struct device *dev, const char *name, ...)
 432                         __attribute__((format(printf, 2, 3)));
 433
 434 #ifdef CONFIG_NUMA
 435 static inline int dev_to_node(struct device *dev)
 436 {
 437         return dev->numa_node;
 438 }
 439 static inline void set_dev_node(struct device *dev, int node)
 440 {
 441         dev->numa_node = node;
 442 }
 443 #else
 444 static inline int dev_to_node(struct device *dev)
 445 {
 446         return -1;
 447 }
 448 static inline void set_dev_node(struct device *dev, int node)
 449 {
 450 }
 451 #endif
 452
 453 static inline void *dev_get_drvdata(const struct device *dev)
 454 {
 455         return dev->driver_data;
 456 }
 457
 458 static inline void dev_set_drvdata(struct device *dev, void *data)
 459 {
 460         dev->driver_data = data;
 461 }
 462
 463 static inline int device_is_registered(struct device *dev)
 464 {
 465         return dev->kobj.state_in_sysfs;
 466 }
 467
 468 void driver_init(void);
 469
 470 /*
 471  * High level routines for use by the bus drivers
 472  */
 473 extern int __must_check device_register(struct device *dev);
 474 extern void device_unregister(struct device *dev);
 475 extern void device_initialize(struct device *dev);
 476 extern int __must_check device_add(struct device *dev);
 477 extern void device_del(struct device *dev);
 478 extern int device_for_each_child(struct device *dev, void *data,
 479                      int (*fn)(struct device *dev, void *data));
 480 extern struct device *device_find_child(struct device *dev, void *data,
 481                                 int (*match)(struct device *dev, void *data));
 482 extern int device_rename(struct device *dev, char *new_name);
 483 extern int device_move(struct device *dev, struct device *new_parent);
 484
 485 /*
 486  * Root device objects for grouping under /sys/devices
 487  */
 488 extern struct device *__root_device_register(const char *name,
 489                                              struct module *owner);
 490 static inline struct device *root_device_register(const char *name)
 491 {
 492         return __root_device_register(name, THIS_MODULE);
 493 }
 494 extern void root_device_unregister(struct device *root);
 495
 496 /*
 497  * Manual binding of a device to driver. See drivers/base/bus.c
 498  * for information on use.
 499  */
 500 extern int __must_check device_bind_driver(struct device *dev);
 501 extern void device_release_driver(struct device *dev);
 502 extern int  __must_check device_attach(struct device *dev);
 503 extern int __must_check driver_attach(struct device_driver *drv);
 504 extern int __must_check device_reprobe(struct device *dev);
 505
 506 /*
 507  * Easy functions for dynamically creating devices on the fly
 508  */
 509 extern struct device *device_create_vargs(struct class *cls,
 510                                           struct device *parent,
 511                                           dev_t devt,
 512                                           void *drvdata,
 513                                           const char *fmt,
 514                                           va_list vargs);
 515 extern struct device *device_create(struct class *cls, struct device *parent,
 516                                     dev_t devt, void *drvdata,
 517                                     const char *fmt, ...)
 518                                     __attribute__((format(printf, 5, 6)));
 519 extern void device_destroy(struct class *cls, dev_t devt);
 520
 521 /*
 522  * Platform "fixup" functions - allow the platform to have their say
 523  * about devices and actions that the general device layer doesn't
 524  * know about.
 525  */
 526 /* Notify platform of device discovery */
 527 extern int (*platform_notify)(struct device *dev);
 528
 529 extern int (*platform_notify_remove)(struct device *dev);
 530
 531
 532 /**
 533  * get_device - atomically increment the reference count for the device.
 534  *
 535  */
 536 extern struct device *get_device(struct device *dev);
 537 extern void put_device(struct device *dev);
 538
 539
 540 /* drivers/base/power/shutdown.c */
 541 extern void device_shutdown(void);
 542
 543 /* drivers/base/sys.c */
 544 extern void sysdev_shutdown(void);
 545
 546 /* debugging and troubleshooting/diagnostic helpers. */
 547 extern const char *dev_driver_string(const struct device *dev);
 548 #define dev_printk(level, dev, format, arg...)  \
 549         printk(level "%s %s: " format , dev_driver_string(dev) , \
 550                dev_name(dev) , ## arg)
 551
 552 #define dev_emerg(dev, format, arg...)          \
 553         dev_printk(KERN_EMERG , dev , format , ## arg)
 554 #define dev_alert(dev, format, arg...)          \
 555         dev_printk(KERN_ALERT , dev , format , ## arg)
 556 #define dev_crit(dev, format, arg...)           \
 557         dev_printk(KERN_CRIT , dev , format , ## arg)
 558 #define dev_err(dev, format, arg...)            \
 559         dev_printk(KERN_ERR , dev , format , ## arg)
 560 #define dev_warn(dev, format, arg...)           \
 561         dev_printk(KERN_WARNING , dev , format , ## arg)
 562 #define dev_notice(dev, format, arg...)         \
 563         dev_printk(KERN_NOTICE , dev , format , ## arg)
 564 #define dev_info(dev, format, arg...)           \
 565         dev_printk(KERN_INFO , dev , format , ## arg)
 566
 567 #if defined(DEBUG)
 568 #define dev_dbg(dev, format, arg...)            \
 569         dev_printk(KERN_DEBUG , dev , format , ## arg)
 570 #elif defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
 571 #define dev_dbg(dev, format, ...) do { \
 572         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 573         } while (0)
 574 #else
 575 #define dev_dbg(dev, format, arg...)            \
 576         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 577 #endif
 578
 579 #ifdef VERBOSE_DEBUG
 580 #define dev_vdbg        dev_dbg
 581 #else
 582
 583 #define dev_vdbg(dev, format, arg...)           \
 584         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 585 #endif
 586
 587 /*
 588  * dev_WARN() acts like dev_printk(), but with the key difference
 589  * of using a WARN/WARN_ON to get the message out, including the
 590  * file/line information and a backtrace.
 591  */
 592 #define dev_WARN(dev, format, arg...) \
 593         WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
 594
 595 /* Create alias, so I can be autoloaded. */
 596 #define MODULE_ALIAS_CHARDEV(major,minor) \
 597         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 598 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 599         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 600 #endif /* _DEVICE_H_ */