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 extern void wait_for_device_probe(void);
 152
 153
 154 /* sysfs interface for exporting driver attributes */
 155
 156 struct driver_attribute {
 157         struct attribute attr;
 158         ssize_t (*show)(struct device_driver *driver, char *buf);
 159         ssize_t (*store)(struct device_driver *driver, const char *buf,
 160                          size_t count);
 161 };
 162
 163 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 164 struct driver_attribute driver_attr_##_name =           \
 165         __ATTR(_name, _mode, _show, _store)
 166
 167 extern int __must_check driver_create_file(struct device_driver *driver,
 168                                            struct driver_attribute *attr);
 169 extern void driver_remove_file(struct device_driver *driver,
 170                                struct driver_attribute *attr);
 171
 172 extern int __must_check driver_add_kobj(struct device_driver *drv,
 173                                         struct kobject *kobj,
 174                                         const char *fmt, ...);
 175
 176 extern int __must_check driver_for_each_device(struct device_driver *drv,
 177                                                struct device *start,
 178                                                void *data,
 179                                                int (*fn)(struct device *dev,
 180                                                          void *));
 181 struct device *driver_find_device(struct device_driver *drv,
 182                                   struct device *start, void *data,
 183                                   int (*match)(struct device *dev, void *data));
 184
 185 /*
 186  * device classes
 187  */
 188 struct class {
 189         const char              *name;
 190         struct module           *owner;
 191
 192         struct class_attribute          *class_attrs;
 193         struct device_attribute         *dev_attrs;
 194         struct kobject                  *dev_kobj;
 195
 196         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 197
 198         void (*class_release)(struct class *class);
 199         void (*dev_release)(struct device *dev);
 200
 201         int (*suspend)(struct device *dev, pm_message_t state);
 202         int (*resume)(struct device *dev);
 203
 204         struct dev_pm_ops *pm;
 205         struct class_private *p;
 206 };
 207
 208 struct class_dev_iter {
 209         struct klist_iter               ki;
 210         const struct device_type        *type;
 211 };
 212
 213 extern struct kobject *sysfs_dev_block_kobj;
 214 extern struct kobject *sysfs_dev_char_kobj;
 215 extern int __must_check __class_register(struct class *class,
 216                                          struct lock_class_key *key);
 217 extern void class_unregister(struct class *class);
 218
 219 /* This is a #define to keep the compiler from merging different
 220  * instances of the __key variable */
 221 #define class_register(class)                   \
 222 ({                                              \
 223         static struct lock_class_key __key;     \
 224         __class_register(class, &__key);        \
 225 })
 226
 227 extern void class_dev_iter_init(struct class_dev_iter *iter,
 228                                 struct class *class,
 229                                 struct device *start,
 230                                 const struct device_type *type);
 231 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 232 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 233
 234 extern int class_for_each_device(struct class *class, struct device *start,
 235                                  void *data,
 236                                  int (*fn)(struct device *dev, void *data));
 237 extern struct device *class_find_device(struct class *class,
 238                                         struct device *start, void *data,
 239                                         int (*match)(struct device *, void *));
 240
 241 struct class_attribute {
 242         struct attribute attr;
 243         ssize_t (*show)(struct class *class, char *buf);
 244         ssize_t (*store)(struct class *class, const char *buf, size_t count);
 245 };
 246
 247 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 248 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 249
 250 extern int __must_check class_create_file(struct class *class,
 251                                           const struct class_attribute *attr);
 252 extern void class_remove_file(struct class *class,
 253                               const struct class_attribute *attr);
 254
 255 struct class_interface {
 256         struct list_head        node;
 257         struct class            *class;
 258
 259         int (*add_dev)          (struct device *, struct class_interface *);
 260         void (*remove_dev)      (struct device *, struct class_interface *);
 261 };
 262
 263 extern int __must_check class_interface_register(struct class_interface *);
 264 extern void class_interface_unregister(struct class_interface *);
 265
 266 extern struct class * __must_check __class_create(struct module *owner,
 267                                                   const char *name,
 268                                                   struct lock_class_key *key);
 269 extern void class_destroy(struct class *cls);
 270
 271 /* This is a #define to keep the compiler from merging different
 272  * instances of the __key variable */
 273 #define class_create(owner, name)               \
 274 ({                                              \
 275         static struct lock_class_key __key;     \
 276         __class_create(owner, name, &__key);    \
 277 })
 278
 279 /*
 280  * The type of device, "struct device" is embedded in. A class
 281  * or bus can contain devices of different types
 282  * like "partitions" and "disks", "mouse" and "event".
 283  * This identifies the device type and carries type-specific
 284  * information, equivalent to the kobj_type of a kobject.
 285  * If "name" is specified, the uevent will contain it in
 286  * the DEVTYPE variable.
 287  */
 288 struct device_type {
 289         const char *name;
 290         struct attribute_group **groups;
 291         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 292         void (*release)(struct device *dev);
 293
 294         int (*suspend)(struct device *dev, pm_message_t state);
 295         int (*resume)(struct device *dev);
 296
 297         struct dev_pm_ops *pm;
 298 };
 299
 300 /* interface for exporting device attributes */
 301 struct device_attribute {
 302         struct attribute        attr;
 303         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 304                         char *buf);
 305         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 306                          const char *buf, size_t count);
 307 };
 308
 309 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 310 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 311
 312 extern int __must_check device_create_file(struct device *device,
 313                                            struct device_attribute *entry);
 314 extern void device_remove_file(struct device *dev,
 315                                struct device_attribute *attr);
 316 extern int __must_check device_create_bin_file(struct device *dev,
 317                                                struct bin_attribute *attr);
 318 extern void device_remove_bin_file(struct device *dev,
 319                                    struct bin_attribute *attr);
 320 extern int device_schedule_callback_owner(struct device *dev,
 321                 void (*func)(struct device *dev), struct module *owner);
 322
 323 /* This is a macro to avoid include problems with THIS_MODULE */
 324 #define device_schedule_callback(dev, func)                     \
 325         device_schedule_callback_owner(dev, func, THIS_MODULE)
 326
 327 /* device resource management */
 328 typedef void (*dr_release_t)(struct device *dev, void *res);
 329 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 330
 331 #ifdef CONFIG_DEBUG_DEVRES
 332 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 333                              const char *name);
 334 #define devres_alloc(release, size, gfp) \
 335         __devres_alloc(release, size, gfp, #release)
 336 #else
 337 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 338 #endif
 339 extern void devres_free(void *res);
 340 extern void devres_add(struct device *dev, void *res);
 341 extern void *devres_find(struct device *dev, dr_release_t release,
 342                          dr_match_t match, void *match_data);
 343 extern void *devres_get(struct device *dev, void *new_res,
 344                         dr_match_t match, void *match_data);
 345 extern void *devres_remove(struct device *dev, dr_release_t release,
 346                            dr_match_t match, void *match_data);
 347 extern int devres_destroy(struct device *dev, dr_release_t release,
 348                           dr_match_t match, void *match_data);
 349
 350 /* devres group */
 351 extern void * __must_check devres_open_group(struct device *dev, void *id,
 352                                              gfp_t gfp);
 353 extern void devres_close_group(struct device *dev, void *id);
 354 extern void devres_remove_group(struct device *dev, void *id);
 355 extern int devres_release_group(struct device *dev, void *id);
 356
 357 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 358 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 359 extern void devm_kfree(struct device *dev, void *p);
 360
 361 struct device_dma_parameters {
 362         /*
 363          * a low level driver may set these to teach IOMMU code about
 364          * sg limitations.
 365          */
 366         unsigned int max_segment_size;
 367         unsigned long segment_boundary_mask;
 368 };
 369
 370 struct device {
 371         struct device           *parent;
 372
 373         struct device_private   *p;
 374
 375         struct kobject kobj;
 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
 388         void            *platform_data; /* We will remove platform_data
 389                                            field if all platform devices
 390                                            pass its platform specific data
 391                                            from platform_device->platform_data,
 392                                            other kind of devices should not
 393                                            use platform_data. */
 394         struct dev_pm_info      power;
 395
 396 #ifdef CONFIG_NUMA
 397         int             numa_node;      /* NUMA node this device is close to */
 398 #endif
 399         u64             *dma_mask;      /* dma mask (if dma'able device) */
 400         u64             coherent_dma_mask;/* Like dma_mask, but for
 401                                              alloc_coherent mappings as
 402                                              not all hardware supports
 403                                              64 bit addresses for consistent
 404                                              allocations such descriptors. */
 405
 406         struct device_dma_parameters *dma_parms;
 407
 408         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 409
 410         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 411                                              override */
 412         /* arch specific additions */
 413         struct dev_archdata     archdata;
 414
 415         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 416
 417         spinlock_t              devres_lock;
 418         struct list_head        devres_head;
 419
 420         struct klist_node       knode_class;
 421         struct class            *class;
 422         struct attribute_group  **groups;       /* optional groups */
 423
 424         void    (*release)(struct device *dev);
 425 };
 426
 427 /* Get the wakeup routines, which depend on struct device */
 428 #include <linux/pm_wakeup.h>
 429
 430 static inline const char *dev_name(const struct device *dev)
 431 {
 432         return kobject_name(&dev->kobj);
 433 }
 434
 435 extern int dev_set_name(struct device *dev, const char *name, ...)
 436                         __attribute__((format(printf, 2, 3)));
 437
 438 #ifdef CONFIG_NUMA
 439 static inline int dev_to_node(struct device *dev)
 440 {
 441         return dev->numa_node;
 442 }
 443 static inline void set_dev_node(struct device *dev, int node)
 444 {
 445         dev->numa_node = node;
 446 }
 447 #else
 448 static inline int dev_to_node(struct device *dev)
 449 {
 450         return -1;
 451 }
 452 static inline void set_dev_node(struct device *dev, int node)
 453 {
 454 }
 455 #endif
 456
 457 static inline void *dev_get_drvdata(const struct device *dev)
 458 {
 459         return dev->driver_data;
 460 }
 461
 462 static inline void dev_set_drvdata(struct device *dev, void *data)
 463 {
 464         dev->driver_data = data;
 465 }
 466
 467 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 468 {
 469         return dev->kobj.uevent_suppress;
 470 }
 471
 472 static inline void dev_set_uevent_suppress(struct device *dev, int val)
 473 {
 474         dev->kobj.uevent_suppress = val;
 475 }
 476
 477 static inline int device_is_registered(struct device *dev)
 478 {
 479         return dev->kobj.state_in_sysfs;
 480 }
 481
 482 void driver_init(void);
 483
 484 /*
 485  * High level routines for use by the bus drivers
 486  */
 487 extern int __must_check device_register(struct device *dev);
 488 extern void device_unregister(struct device *dev);
 489 extern void device_initialize(struct device *dev);
 490 extern int __must_check device_add(struct device *dev);
 491 extern void device_del(struct device *dev);
 492 extern int device_for_each_child(struct device *dev, void *data,
 493                      int (*fn)(struct device *dev, void *data));
 494 extern struct device *device_find_child(struct device *dev, void *data,
 495                                 int (*match)(struct device *dev, void *data));
 496 extern int device_rename(struct device *dev, char *new_name);
 497 extern int device_move(struct device *dev, struct device *new_parent,
 498                        enum dpm_order dpm_order);
 499
 500 /*
 501  * Root device objects for grouping under /sys/devices
 502  */
 503 extern struct device *__root_device_register(const char *name,
 504                                              struct module *owner);
 505 static inline struct device *root_device_register(const char *name)
 506 {
 507         return __root_device_register(name, THIS_MODULE);
 508 }
 509 extern void root_device_unregister(struct device *root);
 510
 511 /*
 512  * Manual binding of a device to driver. See drivers/base/bus.c
 513  * for information on use.
 514  */
 515 extern int __must_check device_bind_driver(struct device *dev);
 516 extern void device_release_driver(struct device *dev);
 517 extern int  __must_check device_attach(struct device *dev);
 518 extern int __must_check driver_attach(struct device_driver *drv);
 519 extern int __must_check device_reprobe(struct device *dev);
 520
 521 /*
 522  * Easy functions for dynamically creating devices on the fly
 523  */
 524 extern struct device *device_create_vargs(struct class *cls,
 525                                           struct device *parent,
 526                                           dev_t devt,
 527                                           void *drvdata,
 528                                           const char *fmt,
 529                                           va_list vargs);
 530 extern struct device *device_create(struct class *cls, struct device *parent,
 531                                     dev_t devt, void *drvdata,
 532                                     const char *fmt, ...)
 533                                     __attribute__((format(printf, 5, 6)));
 534 extern void device_destroy(struct class *cls, dev_t devt);
 535
 536 /*
 537  * Platform "fixup" functions - allow the platform to have their say
 538  * about devices and actions that the general device layer doesn't
 539  * know about.
 540  */
 541 /* Notify platform of device discovery */
 542 extern int (*platform_notify)(struct device *dev);
 543
 544 extern int (*platform_notify_remove)(struct device *dev);
 545
 546
 547 /**
 548  * get_device - atomically increment the reference count for the device.
 549  *
 550  */
 551 extern struct device *get_device(struct device *dev);
 552 extern void put_device(struct device *dev);
 553
 554 extern void wait_for_device_probe(void);
 555
 556 /* drivers/base/power/shutdown.c */
 557 extern void device_shutdown(void);
 558
 559 /* drivers/base/sys.c */
 560 extern void sysdev_shutdown(void);
 561
 562 /* debugging and troubleshooting/diagnostic helpers. */
 563 extern const char *dev_driver_string(const struct device *dev);
 564 #define dev_printk(level, dev, format, arg...)  \
 565         printk(level "%s %s: " format , dev_driver_string(dev) , \
 566                dev_name(dev) , ## arg)
 567
 568 #define dev_emerg(dev, format, arg...)          \
 569         dev_printk(KERN_EMERG , dev , format , ## arg)
 570 #define dev_alert(dev, format, arg...)          \
 571         dev_printk(KERN_ALERT , dev , format , ## arg)
 572 #define dev_crit(dev, format, arg...)           \
 573         dev_printk(KERN_CRIT , dev , format , ## arg)
 574 #define dev_err(dev, format, arg...)            \
 575         dev_printk(KERN_ERR , dev , format , ## arg)
 576 #define dev_warn(dev, format, arg...)           \
 577         dev_printk(KERN_WARNING , dev , format , ## arg)
 578 #define dev_notice(dev, format, arg...)         \
 579         dev_printk(KERN_NOTICE , dev , format , ## arg)
 580 #define dev_info(dev, format, arg...)           \
 581         dev_printk(KERN_INFO , dev , format , ## arg)
 582
 583 #if defined(DEBUG)
 584 #define dev_dbg(dev, format, arg...)            \
 585         dev_printk(KERN_DEBUG , dev , format , ## arg)
 586 #elif defined(CONFIG_DYNAMIC_DEBUG)
 587 #define dev_dbg(dev, format, ...) do { \
 588         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 589         } while (0)
 590 #else
 591 #define dev_dbg(dev, format, arg...)            \
 592         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 593 #endif
 594
 595 #ifdef VERBOSE_DEBUG
 596 #define dev_vdbg        dev_dbg
 597 #else
 598
 599 #define dev_vdbg(dev, format, arg...)           \
 600         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 601 #endif
 602
 603 /*
 604  * dev_WARN() acts like dev_printk(), but with the key difference
 605  * of using a WARN/WARN_ON to get the message out, including the
 606  * file/line information and a backtrace.
 607  */
 608 #define dev_WARN(dev, format, arg...) \
 609         WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
 610
 611 /* Create alias, so I can be autoloaded. */
 612 #define MODULE_ALIAS_CHARDEV(major,minor) \
 613         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 614 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 615         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 616 #endif /* _DEVICE_H_ */