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/compiler.h>
  20 #include <linux/types.h>
  21 #include <linux/module.h>
  22 #include <linux/pm.h>
  23 #include <asm/semaphore.h>
  24 #include <asm/atomic.h>
  25 #include <asm/device.h>
  26
  27 #define DEVICE_NAME_SIZE        50
  28 #define DEVICE_NAME_HALF        __stringify(20) /* Less than half to accommodate slop */
  29 #define DEVICE_ID_SIZE          32
  30 #define BUS_ID_SIZE             KOBJ_NAME_LEN
  31
  32
  33 struct device;
  34 struct device_driver;
  35 struct driver_private;
  36 struct class;
  37 struct class_device;
  38 struct bus_type;
  39 struct bus_type_private;
  40
  41 struct bus_attribute {
  42         struct attribute        attr;
  43         ssize_t (*show)(struct bus_type *, char * buf);
  44         ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
  45 };
  46
  47 #define BUS_ATTR(_name,_mode,_show,_store)      \
  48 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
  49
  50 extern int __must_check bus_create_file(struct bus_type *,
  51                                         struct bus_attribute *);
  52 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  53
  54 struct bus_type {
  55         const char              * name;
  56         struct bus_attribute    * bus_attrs;
  57         struct device_attribute * dev_attrs;
  58         struct driver_attribute * drv_attrs;
  59
  60         int             (*match)(struct device * dev, struct device_driver * drv);
  61         int             (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  62         int             (*probe)(struct device * dev);
  63         int             (*remove)(struct device * dev);
  64         void            (*shutdown)(struct device * dev);
  65
  66         int (*suspend)(struct device * dev, pm_message_t state);
  67         int (*suspend_late)(struct device * dev, pm_message_t state);
  68         int (*resume_early)(struct device * dev);
  69         int (*resume)(struct device * dev);
  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 *, void *));
  83 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  84                                 void *data, int (*match)(struct device *, void *));
  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 /*
  91  * Bus notifiers: Get notified of addition/removal of devices
  92  * and binding/unbinding of drivers to devices.
  93  * In the long run, it should be a replacement for the platform
  94  * notify hooks.
  95  */
  96 struct notifier_block;
  97
  98 extern int bus_register_notifier(struct bus_type *bus,
  99                                  struct notifier_block *nb);
 100 extern int bus_unregister_notifier(struct bus_type *bus,
 101                                    struct notifier_block *nb);
 102
 103 /* All 4 notifers below get called with the target struct device *
 104  * as an argument. Note that those functions are likely to be called
 105  * with the device semaphore held in the core, so be careful.
 106  */
 107 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 108 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 109 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 110 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 111                                                       unbound */
 112
 113 extern struct kset *bus_get_kset(struct bus_type *bus);
 114 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 115
 116 struct device_driver {
 117         const char              *name;
 118         struct bus_type         *bus;
 119
 120         struct module           *owner;
 121         const char              *mod_name;      /* used for built-in modules */
 122
 123         int     (*probe)        (struct device * dev);
 124         int     (*remove)       (struct device * dev);
 125         void    (*shutdown)     (struct device * dev);
 126         int     (*suspend)      (struct device * dev, pm_message_t state);
 127         int     (*resume)       (struct device * dev);
 128         struct attribute_group **groups;
 129
 130         struct driver_private *p;
 131 };
 132
 133
 134 extern int __must_check driver_register(struct device_driver * drv);
 135 extern void driver_unregister(struct device_driver * drv);
 136
 137 extern struct device_driver * get_driver(struct device_driver * drv);
 138 extern void put_driver(struct device_driver * drv);
 139 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 140 extern int driver_probe_done(void);
 141
 142 /* sysfs interface for exporting driver attributes */
 143
 144 struct driver_attribute {
 145         struct attribute        attr;
 146         ssize_t (*show)(struct device_driver *, char * buf);
 147         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 148 };
 149
 150 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 151 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 152
 153 extern int __must_check driver_create_file(struct device_driver *,
 154                                         struct driver_attribute *);
 155 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 156
 157 extern int __must_check driver_add_kobj(struct device_driver *drv,
 158                                         struct kobject *kobj,
 159                                         const char *fmt, ...);
 160
 161 extern int __must_check driver_for_each_device(struct device_driver * drv,
 162                 struct device *start, void *data,
 163                 int (*fn)(struct device *, void *));
 164 struct device * driver_find_device(struct device_driver *drv,
 165                                    struct device *start, void *data,
 166                                    int (*match)(struct device *, void *));
 167
 168 /*
 169  * device classes
 170  */
 171 struct class {
 172         const char              * name;
 173         struct module           * owner;
 174
 175         struct kset             subsys;
 176         struct list_head        children;
 177         struct list_head        devices;
 178         struct list_head        interfaces;
 179         struct kset             class_dirs;
 180         struct semaphore        sem;    /* locks both the children and interfaces lists */
 181
 182         struct class_attribute          * class_attrs;
 183         struct class_device_attribute   * class_dev_attrs;
 184         struct device_attribute         * dev_attrs;
 185
 186         int     (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 187         int     (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 188
 189         void    (*release)(struct class_device *dev);
 190         void    (*class_release)(struct class *class);
 191         void    (*dev_release)(struct device *dev);
 192
 193         int     (*suspend)(struct device *, pm_message_t state);
 194         int     (*resume)(struct device *);
 195 };
 196
 197 extern int __must_check class_register(struct class *);
 198 extern void class_unregister(struct class *);
 199
 200
 201 struct class_attribute {
 202         struct attribute        attr;
 203         ssize_t (*show)(struct class *, char * buf);
 204         ssize_t (*store)(struct class *, const char * buf, size_t count);
 205 };
 206
 207 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 208 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 209
 210 extern int __must_check class_create_file(struct class *,
 211                                         const struct class_attribute *);
 212 extern void class_remove_file(struct class *, const struct class_attribute *);
 213
 214 struct class_device_attribute {
 215         struct attribute        attr;
 216         ssize_t (*show)(struct class_device *, char * buf);
 217         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 218 };
 219
 220 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 221 struct class_device_attribute class_device_attr_##_name =       \
 222         __ATTR(_name,_mode,_show,_store)
 223
 224 extern int __must_check class_device_create_file(struct class_device *,
 225                                     const struct class_device_attribute *);
 226
 227 /**
 228  * struct class_device - class devices
 229  * @class: pointer to the parent class for this class device.  This is required.
 230  * @devt: for internal use by the driver core only.
 231  * @node: for internal use by the driver core only.
 232  * @kobj: for internal use by the driver core only.
 233  * @groups: optional additional groups to be created
 234  * @dev: if set, a symlink to the struct device is created in the sysfs
 235  * directory for this struct class device.
 236  * @class_data: pointer to whatever you want to store here for this struct
 237  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 238  * set this pointer.
 239  * @parent: pointer to a struct class_device that is the parent of this struct
 240  * class_device.  If NULL, this class_device will show up at the root of the
 241  * struct class in sysfs (which is probably what you want to have happen.)
 242  * @release: pointer to a release function for this struct class_device.  If
 243  * set, this will be called instead of the class specific release function.
 244  * Only use this if you want to override the default release function, like
 245  * when you are nesting class_device structures.
 246  * @uevent: pointer to a uevent function for this struct class_device.  If
 247  * set, this will be called instead of the class specific uevent function.
 248  * Only use this if you want to override the default uevent function, like
 249  * when you are nesting class_device structures.
 250  */
 251 struct class_device {
 252         struct list_head        node;
 253
 254         struct kobject          kobj;
 255         struct class            * class;        /* required */
 256         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 257         struct device           * dev;          /* not necessary, but nice to have */
 258         void                    * class_data;   /* class-specific data */
 259         struct class_device     *parent;        /* parent of this child device, if there is one */
 260         struct attribute_group  ** groups;      /* optional groups */
 261
 262         void    (*release)(struct class_device *dev);
 263         int     (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 264         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 265 };
 266
 267 static inline void *
 268 class_get_devdata (struct class_device *dev)
 269 {
 270         return dev->class_data;
 271 }
 272
 273 static inline void
 274 class_set_devdata (struct class_device *dev, void *data)
 275 {
 276         dev->class_data = data;
 277 }
 278
 279
 280 extern int __must_check class_device_register(struct class_device *);
 281 extern void class_device_unregister(struct class_device *);
 282 extern void class_device_initialize(struct class_device *);
 283 extern int __must_check class_device_add(struct class_device *);
 284 extern void class_device_del(struct class_device *);
 285
 286 extern struct class_device * class_device_get(struct class_device *);
 287 extern void class_device_put(struct class_device *);
 288
 289 extern void class_device_remove_file(struct class_device *,
 290                                      const struct class_device_attribute *);
 291 extern int __must_check class_device_create_bin_file(struct class_device *,
 292                                         struct bin_attribute *);
 293 extern void class_device_remove_bin_file(struct class_device *,
 294                                          struct bin_attribute *);
 295
 296 struct class_interface {
 297         struct list_head        node;
 298         struct class            *class;
 299
 300         int (*add)      (struct class_device *, struct class_interface *);
 301         void (*remove)  (struct class_device *, struct class_interface *);
 302         int (*add_dev)          (struct device *, struct class_interface *);
 303         void (*remove_dev)      (struct device *, struct class_interface *);
 304 };
 305
 306 extern int __must_check class_interface_register(struct class_interface *);
 307 extern void class_interface_unregister(struct class_interface *);
 308
 309 extern struct class *class_create(struct module *owner, const char *name);
 310 extern void class_destroy(struct class *cls);
 311 extern struct class_device *class_device_create(struct class *cls,
 312                                                 struct class_device *parent,
 313                                                 dev_t devt,
 314                                                 struct device *device,
 315                                                 const char *fmt, ...)
 316                                         __attribute__((format(printf,5,6)));
 317 extern void class_device_destroy(struct class *cls, dev_t devt);
 318
 319 /*
 320  * The type of device, "struct device" is embedded in. A class
 321  * or bus can contain devices of different types
 322  * like "partitions" and "disks", "mouse" and "event".
 323  * This identifies the device type and carries type-specific
 324  * information, equivalent to the kobj_type of a kobject.
 325  * If "name" is specified, the uevent will contain it in
 326  * the DEVTYPE variable.
 327  */
 328 struct device_type {
 329         const char *name;
 330         struct attribute_group **groups;
 331         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 332         void (*release)(struct device *dev);
 333         int (*suspend)(struct device * dev, pm_message_t state);
 334         int (*resume)(struct device * dev);
 335 };
 336
 337 /* interface for exporting device attributes */
 338 struct device_attribute {
 339         struct attribute        attr;
 340         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 341                         char *buf);
 342         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 343                          const char *buf, size_t count);
 344 };
 345
 346 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 347 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 348
 349 extern int __must_check device_create_file(struct device *device,
 350                                         struct device_attribute * entry);
 351 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 352 extern int __must_check device_create_bin_file(struct device *dev,
 353                                                struct bin_attribute *attr);
 354 extern void device_remove_bin_file(struct device *dev,
 355                                    struct bin_attribute *attr);
 356 extern int device_schedule_callback_owner(struct device *dev,
 357                 void (*func)(struct device *), struct module *owner);
 358
 359 /* This is a macro to avoid include problems with THIS_MODULE */
 360 #define device_schedule_callback(dev, func)                     \
 361         device_schedule_callback_owner(dev, func, THIS_MODULE)
 362
 363 /* device resource management */
 364 typedef void (*dr_release_t)(struct device *dev, void *res);
 365 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 366
 367 #ifdef CONFIG_DEBUG_DEVRES
 368 extern void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 369                              const char *name);
 370 #define devres_alloc(release, size, gfp) \
 371         __devres_alloc(release, size, gfp, #release)
 372 #else
 373 extern void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 374 #endif
 375 extern void devres_free(void *res);
 376 extern void devres_add(struct device *dev, void *res);
 377 extern void * devres_find(struct device *dev, dr_release_t release,
 378                           dr_match_t match, void *match_data);
 379 extern void * devres_get(struct device *dev, void *new_res,
 380                          dr_match_t match, void *match_data);
 381 extern void * devres_remove(struct device *dev, dr_release_t release,
 382                             dr_match_t match, void *match_data);
 383 extern int devres_destroy(struct device *dev, dr_release_t release,
 384                           dr_match_t match, void *match_data);
 385
 386 /* devres group */
 387 extern void * __must_check devres_open_group(struct device *dev, void *id,
 388                                              gfp_t gfp);
 389 extern void devres_close_group(struct device *dev, void *id);
 390 extern void devres_remove_group(struct device *dev, void *id);
 391 extern int devres_release_group(struct device *dev, void *id);
 392
 393 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 394 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 395 extern void devm_kfree(struct device *dev, void *p);
 396
 397 struct device {
 398         struct klist            klist_children;
 399         struct klist_node       knode_parent;           /* node in sibling list */
 400         struct klist_node       knode_driver;
 401         struct klist_node       knode_bus;
 402         struct device           *parent;
 403
 404         struct kobject kobj;
 405         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 406         struct device_type      *type;
 407         unsigned                is_registered:1;
 408         unsigned                uevent_suppress:1;
 409
 410         struct semaphore        sem;    /* semaphore to synchronize calls to
 411                                          * its driver.
 412                                          */
 413
 414         struct bus_type * bus;          /* type of bus device is on */
 415         struct device_driver *driver;   /* which driver has allocated this
 416                                            device */
 417         void            *driver_data;   /* data private to the driver */
 418         void            *platform_data; /* Platform specific data, device
 419                                            core doesn't touch it */
 420         struct dev_pm_info      power;
 421
 422 #ifdef CONFIG_NUMA
 423         int             numa_node;      /* NUMA node this device is close to */
 424 #endif
 425         u64             *dma_mask;      /* dma mask (if dma'able device) */
 426         u64             coherent_dma_mask;/* Like dma_mask, but for
 427                                              alloc_coherent mappings as
 428                                              not all hardware supports
 429                                              64 bit addresses for consistent
 430                                              allocations such descriptors. */
 431
 432         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 433
 434         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 435                                              override */
 436         /* arch specific additions */
 437         struct dev_archdata     archdata;
 438
 439         spinlock_t              devres_lock;
 440         struct list_head        devres_head;
 441
 442         /* class_device migration path */
 443         struct list_head        node;
 444         struct class            *class;
 445         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 446         struct attribute_group  **groups;       /* optional groups */
 447
 448         void    (*release)(struct device * dev);
 449 };
 450
 451 #ifdef CONFIG_NUMA
 452 static inline int dev_to_node(struct device *dev)
 453 {
 454         return dev->numa_node;
 455 }
 456 static inline void set_dev_node(struct device *dev, int node)
 457 {
 458         dev->numa_node = node;
 459 }
 460 #else
 461 static inline int dev_to_node(struct device *dev)
 462 {
 463         return -1;
 464 }
 465 static inline void set_dev_node(struct device *dev, int node)
 466 {
 467 }
 468 #endif
 469
 470 static inline void *
 471 dev_get_drvdata (struct device *dev)
 472 {
 473         return dev->driver_data;
 474 }
 475
 476 static inline void
 477 dev_set_drvdata (struct device *dev, void *data)
 478 {
 479         dev->driver_data = data;
 480 }
 481
 482 static inline int device_is_registered(struct device *dev)
 483 {
 484         return dev->is_registered;
 485 }
 486
 487 void driver_init(void);
 488
 489 /*
 490  * High level routines for use by the bus drivers
 491  */
 492 extern int __must_check device_register(struct device * dev);
 493 extern void device_unregister(struct device * dev);
 494 extern void device_initialize(struct device * dev);
 495 extern int __must_check device_add(struct device * dev);
 496 extern void device_del(struct device * dev);
 497 extern int device_for_each_child(struct device *, void *,
 498                      int (*fn)(struct device *, void *));
 499 extern struct device *device_find_child(struct device *, void *data,
 500                                         int (*match)(struct device *, void *));
 501 extern int device_rename(struct device *dev, char *new_name);
 502 extern int device_move(struct device *dev, struct device *new_parent);
 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(struct class *cls, struct device *parent,
 518                                     dev_t devt, const char *fmt, ...)
 519                                     __attribute__((format(printf,4,5)));
 520 extern void device_destroy(struct class *cls, dev_t devt);
 521 #ifdef CONFIG_PM_SLEEP
 522 extern void destroy_suspended_device(struct class *cls, dev_t devt);
 523 #else /* !CONFIG_PM_SLEEP */
 524 static inline void destroy_suspended_device(struct class *cls, dev_t devt)
 525 {
 526         device_destroy(cls, devt);
 527 }
 528 #endif /* !CONFIG_PM_SLEEP */
 529
 530 /*
 531  * Platform "fixup" functions - allow the platform to have their say
 532  * about devices and actions that the general device layer doesn't
 533  * know about.
 534  */
 535 /* Notify platform of device discovery */
 536 extern int (*platform_notify)(struct device * dev);
 537
 538 extern int (*platform_notify_remove)(struct device * dev);
 539
 540
 541 /**
 542  * get_device - atomically increment the reference count for the device.
 543  *
 544  */
 545 extern struct device * get_device(struct device * dev);
 546 extern void put_device(struct device * dev);
 547
 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(struct device *dev);
 557 #define dev_printk(level, dev, format, arg...)  \
 558         printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
 559
 560 #define dev_emerg(dev, format, arg...)          \
 561         dev_printk(KERN_EMERG , dev , format , ## arg)
 562 #define dev_alert(dev, format, arg...)          \
 563         dev_printk(KERN_ALERT , dev , format , ## arg)
 564 #define dev_crit(dev, format, arg...)           \
 565         dev_printk(KERN_CRIT , dev , format , ## arg)
 566 #define dev_err(dev, format, arg...)            \
 567         dev_printk(KERN_ERR , dev , format , ## arg)
 568 #define dev_warn(dev, format, arg...)           \
 569         dev_printk(KERN_WARNING , dev , format , ## arg)
 570 #define dev_notice(dev, format, arg...)         \
 571         dev_printk(KERN_NOTICE , dev , format , ## arg)
 572 #define dev_info(dev, format, arg...)           \
 573         dev_printk(KERN_INFO , dev , format , ## arg)
 574
 575 #ifdef DEBUG
 576 #define dev_dbg(dev, format, arg...)            \
 577         dev_printk(KERN_DEBUG , dev , format , ## arg)
 578 #else
 579 static inline int __attribute__ ((format (printf, 2, 3)))
 580 dev_dbg(struct device * dev, const char * fmt, ...)
 581 {
 582         return 0;
 583 }
 584 #endif
 585
 586 #ifdef VERBOSE_DEBUG
 587 #define dev_vdbg        dev_dbg
 588 #else
 589 static inline int __attribute__ ((format (printf, 2, 3)))
 590 dev_vdbg(struct device * dev, const char * fmt, ...)
 591 {
 592         return 0;
 593 }
 594 #endif
 595
 596 /* Create alias, so I can be autoloaded. */
 597 #define MODULE_ALIAS_CHARDEV(major,minor) \
 598         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 599 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 600         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 601 #endif /* _DEVICE_H_ */