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 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
  37 struct bus_attribute {
  38         struct attribute        attr;
  39         ssize_t (*show)(struct bus_type *bus, char *buf);
  40         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  41 };
  42
  43 #define BUS_ATTR(_name, _mode, _show, _store)   \
  44 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  45
  46 extern int __must_check bus_create_file(struct bus_type *,
  47                                         struct bus_attribute *);
  48 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  49
  50 struct bus_type {
  51         const char              *name;
  52         struct bus_attribute    *bus_attrs;
  53         struct device_attribute *dev_attrs;
  54         struct driver_attribute *drv_attrs;
  55
  56         int (*match)(struct device *dev, struct device_driver *drv);
  57         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  58         int (*probe)(struct device *dev);
  59         int (*remove)(struct device *dev);
  60         void (*shutdown)(struct device *dev);
  61
  62         int (*suspend)(struct device *dev, pm_message_t state);
  63         int (*resume)(struct device *dev);
  64
  65         struct dev_pm_ops *pm;
  66
  67         struct bus_type_private *p;
  68 };
  69
  70 extern int __must_check bus_register(struct bus_type *bus);
  71 extern void bus_unregister(struct bus_type *bus);
  72
  73 extern int __must_check bus_rescan_devices(struct bus_type *bus);
  74
  75 /* iterator helpers for buses */
  76
  77 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
  78                      int (*fn)(struct device *dev, void *data));
  79 struct device *bus_find_device(struct bus_type *bus, struct device *start,
  80                                void *data,
  81                                int (*match)(struct device *dev, void *data));
  82 struct device *bus_find_device_by_name(struct bus_type *bus,
  83                                        struct device *start,
  84                                        const char *name);
  85
  86 int __must_check bus_for_each_drv(struct bus_type *bus,
  87                                   struct device_driver *start, void *data,
  88                                   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 semaphore 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         int (*probe) (struct device *dev);
 129         int (*remove) (struct device *dev);
 130         void (*shutdown) (struct device *dev);
 131         int (*suspend) (struct device *dev, pm_message_t state);
 132         int (*resume) (struct device *dev);
 133         struct attribute_group **groups;
 134
 135         struct dev_pm_ops *pm;
 136
 137         struct driver_private *p;
 138 };
 139
 140
 141 extern int __must_check driver_register(struct device_driver *drv);
 142 extern void driver_unregister(struct device_driver *drv);
 143
 144 extern struct device_driver *get_driver(struct device_driver *drv);
 145 extern void put_driver(struct device_driver *drv);
 146 extern struct device_driver *driver_find(const char *name,
 147                                          struct bus_type *bus);
 148 extern int driver_probe_done(void);
 149 extern void wait_for_device_probe(void);
 150
 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         char *(*nodename)(struct device *dev);
 196
 197         void (*class_release)(struct class *class);
 198         void (*dev_release)(struct device *dev);
 199
 200         int (*suspend)(struct device *dev, pm_message_t state);
 201         int (*resume)(struct device *dev);
 202
 203         struct dev_pm_ops *pm;
 204         struct class_private *p;
 205 };
 206
 207 struct class_dev_iter {
 208         struct klist_iter               ki;
 209         const struct device_type        *type;
 210 };
 211
 212 extern struct kobject *sysfs_dev_block_kobj;
 213 extern struct kobject *sysfs_dev_char_kobj;
 214 extern int __must_check __class_register(struct class *class,
 215                                          struct lock_class_key *key);
 216 extern void class_unregister(struct class *class);
 217
 218 /* This is a #define to keep the compiler from merging different
 219  * instances of the __key variable */
 220 #define class_register(class)                   \
 221 ({                                              \
 222         static struct lock_class_key __key;     \
 223         __class_register(class, &__key);        \
 224 })
 225
 226 extern void class_dev_iter_init(struct class_dev_iter *iter,
 227                                 struct class *class,
 228                                 struct device *start,
 229                                 const struct device_type *type);
 230 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 231 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 232
 233 extern int class_for_each_device(struct class *class, struct device *start,
 234                                  void *data,
 235                                  int (*fn)(struct device *dev, void *data));
 236 extern struct device *class_find_device(struct class *class,
 237                                         struct device *start, void *data,
 238                                         int (*match)(struct device *, void *));
 239
 240 struct class_attribute {
 241         struct attribute attr;
 242         ssize_t (*show)(struct class *class, char *buf);
 243         ssize_t (*store)(struct class *class, const char *buf, size_t count);
 244 };
 245
 246 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 247 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 248
 249 extern int __must_check class_create_file(struct class *class,
 250                                           const struct class_attribute *attr);
 251 extern void class_remove_file(struct class *class,
 252                               const struct class_attribute *attr);
 253
 254 struct class_interface {
 255         struct list_head        node;
 256         struct class            *class;
 257
 258         int (*add_dev)          (struct device *, struct class_interface *);
 259         void (*remove_dev)      (struct device *, struct class_interface *);
 260 };
 261
 262 extern int __must_check class_interface_register(struct class_interface *);
 263 extern void class_interface_unregister(struct class_interface *);
 264
 265 extern struct class * __must_check __class_create(struct module *owner,
 266                                                   const char *name,
 267                                                   struct lock_class_key *key);
 268 extern void class_destroy(struct class *cls);
 269
 270 /* This is a #define to keep the compiler from merging different
 271  * instances of the __key variable */
 272 #define class_create(owner, name)               \
 273 ({                                              \
 274         static struct lock_class_key __key;     \
 275         __class_create(owner, name, &__key);    \
 276 })
 277
 278 /*
 279  * The type of device, "struct device" is embedded in. A class
 280  * or bus can contain devices of different types
 281  * like "partitions" and "disks", "mouse" and "event".
 282  * This identifies the device type and carries type-specific
 283  * information, equivalent to the kobj_type of a kobject.
 284  * If "name" is specified, the uevent will contain it in
 285  * the DEVTYPE variable.
 286  */
 287 struct device_type {
 288         const char *name;
 289         struct attribute_group **groups;
 290         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 291         char *(*nodename)(struct device *dev);
 292         void (*release)(struct device *dev);
 293
 294         struct dev_pm_ops *pm;
 295 };
 296
 297 /* interface for exporting device attributes */
 298 struct device_attribute {
 299         struct attribute        attr;
 300         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 301                         char *buf);
 302         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 303                          const char *buf, size_t count);
 304 };
 305
 306 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 307 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 308
 309 extern int __must_check device_create_file(struct device *device,
 310                                            struct device_attribute *entry);
 311 extern void device_remove_file(struct device *dev,
 312                                struct device_attribute *attr);
 313 extern int __must_check device_create_bin_file(struct device *dev,
 314                                                struct bin_attribute *attr);
 315 extern void device_remove_bin_file(struct device *dev,
 316                                    struct bin_attribute *attr);
 317 extern int device_schedule_callback_owner(struct device *dev,
 318                 void (*func)(struct device *dev), struct module *owner);
 319
 320 /* This is a macro to avoid include problems with THIS_MODULE */
 321 #define device_schedule_callback(dev, func)                     \
 322         device_schedule_callback_owner(dev, func, THIS_MODULE)
 323
 324 /* device resource management */
 325 typedef void (*dr_release_t)(struct device *dev, void *res);
 326 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 327
 328 #ifdef CONFIG_DEBUG_DEVRES
 329 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 330                              const char *name);
 331 #define devres_alloc(release, size, gfp) \
 332         __devres_alloc(release, size, gfp, #release)
 333 #else
 334 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 335 #endif
 336 extern void devres_free(void *res);
 337 extern void devres_add(struct device *dev, void *res);
 338 extern void *devres_find(struct device *dev, dr_release_t release,
 339                          dr_match_t match, void *match_data);
 340 extern void *devres_get(struct device *dev, void *new_res,
 341                         dr_match_t match, void *match_data);
 342 extern void *devres_remove(struct device *dev, dr_release_t release,
 343                            dr_match_t match, void *match_data);
 344 extern int devres_destroy(struct device *dev, dr_release_t release,
 345                           dr_match_t match, void *match_data);
 346
 347 /* devres group */
 348 extern void * __must_check devres_open_group(struct device *dev, void *id,
 349                                              gfp_t gfp);
 350 extern void devres_close_group(struct device *dev, void *id);
 351 extern void devres_remove_group(struct device *dev, void *id);
 352 extern int devres_release_group(struct device *dev, void *id);
 353
 354 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 355 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 356 extern void devm_kfree(struct device *dev, void *p);
 357
 358 struct device_dma_parameters {
 359         /*
 360          * a low level driver may set these to teach IOMMU code about
 361          * sg limitations.
 362          */
 363         unsigned int max_segment_size;
 364         unsigned long segment_boundary_mask;
 365 };
 366
 367 struct device {
 368         struct device           *parent;
 369
 370         struct device_private   *p;
 371
 372         struct kobject kobj;
 373         const char              *init_name; /* initial name of the device */
 374         struct device_type      *type;
 375
 376         struct semaphore        sem;    /* semaphore to synchronize calls to
 377                                          * its driver.
 378                                          */
 379
 380         struct bus_type *bus;           /* type of bus device is on */
 381         struct device_driver *driver;   /* which driver has allocated this
 382                                            device */
 383         void            *driver_data;   /* data private to the driver */
 384         void            *platform_data; /* Platform specific data, device
 385                                            core doesn't touch it */
 386         struct dev_pm_info      power;
 387
 388 #ifdef CONFIG_NUMA
 389         int             numa_node;      /* NUMA node this device is close to */
 390 #endif
 391         u64             *dma_mask;      /* dma mask (if dma'able device) */
 392         u64             coherent_dma_mask;/* Like dma_mask, but for
 393                                              alloc_coherent mappings as
 394                                              not all hardware supports
 395                                              64 bit addresses for consistent
 396                                              allocations such descriptors. */
 397
 398         struct device_dma_parameters *dma_parms;
 399
 400         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 401
 402         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 403                                              override */
 404         /* arch specific additions */
 405         struct dev_archdata     archdata;
 406
 407         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 408
 409         spinlock_t              devres_lock;
 410         struct list_head        devres_head;
 411
 412         struct klist_node       knode_class;
 413         struct class            *class;
 414         struct attribute_group  **groups;       /* optional groups */
 415
 416         void    (*release)(struct device *dev);
 417 };
 418
 419 /* Get the wakeup routines, which depend on struct device */
 420 #include <linux/pm_wakeup.h>
 421
 422 static inline const char *dev_name(const struct device *dev)
 423 {
 424         return kobject_name(&dev->kobj);
 425 }
 426
 427 extern int dev_set_name(struct device *dev, const char *name, ...)
 428                         __attribute__((format(printf, 2, 3)));
 429
 430 #ifdef CONFIG_NUMA
 431 static inline int dev_to_node(struct device *dev)
 432 {
 433         return dev->numa_node;
 434 }
 435 static inline void set_dev_node(struct device *dev, int node)
 436 {
 437         dev->numa_node = node;
 438 }
 439 #else
 440 static inline int dev_to_node(struct device *dev)
 441 {
 442         return -1;
 443 }
 444 static inline void set_dev_node(struct device *dev, int node)
 445 {
 446 }
 447 #endif
 448
 449 static inline void *dev_get_drvdata(const struct device *dev)
 450 {
 451         return dev->driver_data;
 452 }
 453
 454 static inline void dev_set_drvdata(struct device *dev, void *data)
 455 {
 456         dev->driver_data = data;
 457 }
 458
 459 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
 460 {
 461         return dev->kobj.uevent_suppress;
 462 }
 463
 464 static inline void dev_set_uevent_suppress(struct device *dev, int val)
 465 {
 466         dev->kobj.uevent_suppress = val;
 467 }
 468
 469 static inline int device_is_registered(struct device *dev)
 470 {
 471         return dev->kobj.state_in_sysfs;
 472 }
 473
 474 void driver_init(void);
 475
 476 /*
 477  * High level routines for use by the bus drivers
 478  */
 479 extern int __must_check device_register(struct device *dev);
 480 extern void device_unregister(struct device *dev);
 481 extern void device_initialize(struct device *dev);
 482 extern int __must_check device_add(struct device *dev);
 483 extern void device_del(struct device *dev);
 484 extern int device_for_each_child(struct device *dev, void *data,
 485                      int (*fn)(struct device *dev, void *data));
 486 extern struct device *device_find_child(struct device *dev, void *data,
 487                                 int (*match)(struct device *dev, void *data));
 488 extern int device_rename(struct device *dev, char *new_name);
 489 extern int device_move(struct device *dev, struct device *new_parent,
 490                        enum dpm_order dpm_order);
 491 extern const char *device_get_nodename(struct device *dev, const char **tmp);
 492
 493 /*
 494  * Root device objects for grouping under /sys/devices
 495  */
 496 extern struct device *__root_device_register(const char *name,
 497                                              struct module *owner);
 498 static inline struct device *root_device_register(const char *name)
 499 {
 500         return __root_device_register(name, THIS_MODULE);
 501 }
 502 extern void root_device_unregister(struct device *root);
 503
 504 /*
 505  * Manual binding of a device to driver. See drivers/base/bus.c
 506  * for information on use.
 507  */
 508 extern int __must_check device_bind_driver(struct device *dev);
 509 extern void device_release_driver(struct device *dev);
 510 extern int  __must_check device_attach(struct device *dev);
 511 extern int __must_check driver_attach(struct device_driver *drv);
 512 extern int __must_check device_reprobe(struct device *dev);
 513
 514 /*
 515  * Easy functions for dynamically creating devices on the fly
 516  */
 517 extern struct device *device_create_vargs(struct class *cls,
 518                                           struct device *parent,
 519                                           dev_t devt,
 520                                           void *drvdata,
 521                                           const char *fmt,
 522                                           va_list vargs);
 523 extern struct device *device_create(struct class *cls, struct device *parent,
 524                                     dev_t devt, void *drvdata,
 525                                     const char *fmt, ...)
 526                                     __attribute__((format(printf, 5, 6)));
 527 extern void device_destroy(struct class *cls, dev_t devt);
 528
 529 /*
 530  * Platform "fixup" functions - allow the platform to have their say
 531  * about devices and actions that the general device layer doesn't
 532  * know about.
 533  */
 534 /* Notify platform of device discovery */
 535 extern int (*platform_notify)(struct device *dev);
 536
 537 extern int (*platform_notify_remove)(struct device *dev);
 538
 539
 540 /**
 541  * get_device - atomically increment the reference count for the device.
 542  *
 543  */
 544 extern struct device *get_device(struct device *dev);
 545 extern void put_device(struct device *dev);
 546
 547 extern void wait_for_device_probe(void);
 548
 549 /* drivers/base/power/shutdown.c */
 550 extern void device_shutdown(void);
 551
 552 /* drivers/base/sys.c */
 553 extern void sysdev_shutdown(void);
 554
 555 /* debugging and troubleshooting/diagnostic helpers. */
 556 extern const char *dev_driver_string(const struct device *dev);
 557 #define dev_printk(level, dev, format, arg...)  \
 558         printk(level "%s %s: " format , dev_driver_string(dev) , \
 559                dev_name(dev) , ## arg)
 560
 561 #define dev_emerg(dev, format, arg...)          \
 562         dev_printk(KERN_EMERG , dev , format , ## arg)
 563 #define dev_alert(dev, format, arg...)          \
 564         dev_printk(KERN_ALERT , dev , format , ## arg)
 565 #define dev_crit(dev, format, arg...)           \
 566         dev_printk(KERN_CRIT , dev , format , ## arg)
 567 #define dev_err(dev, format, arg...)            \
 568         dev_printk(KERN_ERR , dev , format , ## arg)
 569 #define dev_warn(dev, format, arg...)           \
 570         dev_printk(KERN_WARNING , dev , format , ## arg)
 571 #define dev_notice(dev, format, arg...)         \
 572         dev_printk(KERN_NOTICE , dev , format , ## arg)
 573 #define dev_info(dev, format, arg...)           \
 574         dev_printk(KERN_INFO , dev , format , ## arg)
 575
 576 #if defined(DEBUG)
 577 #define dev_dbg(dev, format, arg...)            \
 578         dev_printk(KERN_DEBUG , dev , format , ## arg)
 579 #elif defined(CONFIG_DYNAMIC_DEBUG)
 580 #define dev_dbg(dev, format, ...) do { \
 581         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
 582         } while (0)
 583 #else
 584 #define dev_dbg(dev, format, arg...)            \
 585         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 586 #endif
 587
 588 #ifdef VERBOSE_DEBUG
 589 #define dev_vdbg        dev_dbg
 590 #else
 591
 592 #define dev_vdbg(dev, format, arg...)           \
 593         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 594 #endif
 595
 596 /*
 597  * dev_WARN() acts like dev_printk(), but with the key difference
 598  * of using a WARN/WARN_ON to get the message out, including the
 599  * file/line information and a backtrace.
 600  */
 601 #define dev_WARN(dev, format, arg...) \
 602         WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
 603
 604 /* Create alias, so I can be autoloaded. */
 605 #define MODULE_ALIAS_CHARDEV(major,minor) \
 606         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 607 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 608         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 609 #endif /* _DEVICE_H_ */