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 class;
  36 struct class_device;
  37 struct bus_type;
  38
  39 struct bus_attribute {
  40         struct attribute        attr;
  41         ssize_t (*show)(struct bus_type *, char * buf);
  42         ssize_t (*store)(struct bus_type *, 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
  55         struct kset             subsys;
  56         struct kset             *drivers_kset;
  57         struct kset             *devices_kset;
  58         struct klist            klist_devices;
  59         struct klist            klist_drivers;
  60
  61         struct blocking_notifier_head bus_notifier;
  62
  63         struct bus_attribute    * bus_attrs;
  64         struct device_attribute * dev_attrs;
  65         struct driver_attribute * drv_attrs;
  66
  67         int             (*match)(struct device * dev, struct device_driver * drv);
  68         int             (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  69         int             (*probe)(struct device * dev);
  70         int             (*remove)(struct device * dev);
  71         void            (*shutdown)(struct device * dev);
  72
  73         int (*suspend)(struct device * dev, pm_message_t state);
  74         int (*suspend_late)(struct device * dev, pm_message_t state);
  75         int (*resume_early)(struct device * dev);
  76         int (*resume)(struct device * dev);
  77
  78         unsigned int drivers_autoprobe:1;
  79 };
  80
  81 extern int __must_check bus_register(struct bus_type * bus);
  82 extern void bus_unregister(struct bus_type * bus);
  83
  84 extern int __must_check bus_rescan_devices(struct bus_type * bus);
  85
  86 /* iterator helpers for buses */
  87
  88 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  89                      int (*fn)(struct device *, void *));
  90 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  91                                 void *data, int (*match)(struct device *, void *));
  92
  93 int __must_check bus_for_each_drv(struct bus_type *bus,
  94                 struct device_driver *start, void *data,
  95                 int (*fn)(struct device_driver *, void *));
  96
  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
 122 struct device_driver {
 123         const char              * name;
 124         struct bus_type         * bus;
 125
 126         struct kobject          kobj;
 127         struct klist            klist_devices;
 128         struct klist_node       knode_bus;
 129
 130         struct module           * owner;
 131         const char              * mod_name;     /* used for built-in modules */
 132         struct module_kobject   * mkobj;
 133
 134         int     (*probe)        (struct device * dev);
 135         int     (*remove)       (struct device * dev);
 136         void    (*shutdown)     (struct device * dev);
 137         int     (*suspend)      (struct device * dev, pm_message_t state);
 138         int     (*resume)       (struct device * dev);
 139 };
 140
 141
 142 extern int __must_check driver_register(struct device_driver * drv);
 143 extern void driver_unregister(struct device_driver * drv);
 144
 145 extern struct device_driver * get_driver(struct device_driver * drv);
 146 extern void put_driver(struct device_driver * drv);
 147 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 148 extern int driver_probe_done(void);
 149
 150 /* sysfs interface for exporting driver attributes */
 151
 152 struct driver_attribute {
 153         struct attribute        attr;
 154         ssize_t (*show)(struct device_driver *, char * buf);
 155         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 156 };
 157
 158 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 159 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 160
 161 extern int __must_check driver_create_file(struct device_driver *,
 162                                         struct driver_attribute *);
 163 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 164
 165 extern int __must_check driver_for_each_device(struct device_driver * drv,
 166                 struct device *start, void *data,
 167                 int (*fn)(struct device *, void *));
 168 struct device * driver_find_device(struct device_driver *drv,
 169                                    struct device *start, void *data,
 170                                    int (*match)(struct device *, void *));
 171
 172 /*
 173  * device classes
 174  */
 175 struct class {
 176         const char              * name;
 177         struct module           * owner;
 178
 179         struct kset             subsys;
 180         struct list_head        children;
 181         struct list_head        devices;
 182         struct list_head        interfaces;
 183         struct kset             class_dirs;
 184         struct semaphore        sem;    /* locks both the children and interfaces lists */
 185
 186         struct class_attribute          * class_attrs;
 187         struct class_device_attribute   * class_dev_attrs;
 188         struct device_attribute         * dev_attrs;
 189
 190         int     (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 191         int     (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 192
 193         void    (*release)(struct class_device *dev);
 194         void    (*class_release)(struct class *class);
 195         void    (*dev_release)(struct device *dev);
 196
 197         int     (*suspend)(struct device *, pm_message_t state);
 198         int     (*resume)(struct device *);
 199 };
 200
 201 extern int __must_check class_register(struct class *);
 202 extern void class_unregister(struct class *);
 203
 204
 205 struct class_attribute {
 206         struct attribute        attr;
 207         ssize_t (*show)(struct class *, char * buf);
 208         ssize_t (*store)(struct class *, const char * buf, size_t count);
 209 };
 210
 211 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 212 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 213
 214 extern int __must_check class_create_file(struct class *,
 215                                         const struct class_attribute *);
 216 extern void class_remove_file(struct class *, const struct class_attribute *);
 217
 218 struct class_device_attribute {
 219         struct attribute        attr;
 220         ssize_t (*show)(struct class_device *, char * buf);
 221         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 222 };
 223
 224 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 225 struct class_device_attribute class_device_attr_##_name =       \
 226         __ATTR(_name,_mode,_show,_store)
 227
 228 extern int __must_check class_device_create_file(struct class_device *,
 229                                     const struct class_device_attribute *);
 230
 231 /**
 232  * struct class_device - class devices
 233  * @class: pointer to the parent class for this class device.  This is required.
 234  * @devt: for internal use by the driver core only.
 235  * @node: for internal use by the driver core only.
 236  * @kobj: for internal use by the driver core only.
 237  * @groups: optional additional groups to be created
 238  * @dev: if set, a symlink to the struct device is created in the sysfs
 239  * directory for this struct class device.
 240  * @class_data: pointer to whatever you want to store here for this struct
 241  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 242  * set this pointer.
 243  * @parent: pointer to a struct class_device that is the parent of this struct
 244  * class_device.  If NULL, this class_device will show up at the root of the
 245  * struct class in sysfs (which is probably what you want to have happen.)
 246  * @release: pointer to a release function for this struct class_device.  If
 247  * set, this will be called instead of the class specific release function.
 248  * Only use this if you want to override the default release function, like
 249  * when you are nesting class_device structures.
 250  * @uevent: pointer to a uevent function for this struct class_device.  If
 251  * set, this will be called instead of the class specific uevent function.
 252  * Only use this if you want to override the default uevent function, like
 253  * when you are nesting class_device structures.
 254  */
 255 struct class_device {
 256         struct list_head        node;
 257
 258         struct kobject          kobj;
 259         struct class            * class;        /* required */
 260         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 261         struct device           * dev;          /* not necessary, but nice to have */
 262         void                    * class_data;   /* class-specific data */
 263         struct class_device     *parent;        /* parent of this child device, if there is one */
 264         struct attribute_group  ** groups;      /* optional groups */
 265
 266         void    (*release)(struct class_device *dev);
 267         int     (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 268         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 269 };
 270
 271 static inline void *
 272 class_get_devdata (struct class_device *dev)
 273 {
 274         return dev->class_data;
 275 }
 276
 277 static inline void
 278 class_set_devdata (struct class_device *dev, void *data)
 279 {
 280         dev->class_data = data;
 281 }
 282
 283
 284 extern int __must_check class_device_register(struct class_device *);
 285 extern void class_device_unregister(struct class_device *);
 286 extern void class_device_initialize(struct class_device *);
 287 extern int __must_check class_device_add(struct class_device *);
 288 extern void class_device_del(struct class_device *);
 289
 290 extern struct class_device * class_device_get(struct class_device *);
 291 extern void class_device_put(struct class_device *);
 292
 293 extern void class_device_remove_file(struct class_device *,
 294                                      const struct class_device_attribute *);
 295 extern int __must_check class_device_create_bin_file(struct class_device *,
 296                                         struct bin_attribute *);
 297 extern void class_device_remove_bin_file(struct class_device *,
 298                                          struct bin_attribute *);
 299
 300 struct class_interface {
 301         struct list_head        node;
 302         struct class            *class;
 303
 304         int (*add)      (struct class_device *, struct class_interface *);
 305         void (*remove)  (struct class_device *, struct class_interface *);
 306         int (*add_dev)          (struct device *, struct class_interface *);
 307         void (*remove_dev)      (struct device *, struct class_interface *);
 308 };
 309
 310 extern int __must_check class_interface_register(struct class_interface *);
 311 extern void class_interface_unregister(struct class_interface *);
 312
 313 extern struct class *class_create(struct module *owner, const char *name);
 314 extern void class_destroy(struct class *cls);
 315 extern struct class_device *class_device_create(struct class *cls,
 316                                                 struct class_device *parent,
 317                                                 dev_t devt,
 318                                                 struct device *device,
 319                                                 const char *fmt, ...)
 320                                         __attribute__((format(printf,5,6)));
 321 extern void class_device_destroy(struct class *cls, dev_t devt);
 322
 323 /*
 324  * The type of device, "struct device" is embedded in. A class
 325  * or bus can contain devices of different types
 326  * like "partitions" and "disks", "mouse" and "event".
 327  * This identifies the device type and carries type-specific
 328  * information, equivalent to the kobj_type of a kobject.
 329  * If "name" is specified, the uevent will contain it in
 330  * the DEVTYPE variable.
 331  */
 332 struct device_type {
 333         const char *name;
 334         struct attribute_group **groups;
 335         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 336         void (*release)(struct device *dev);
 337         int (*suspend)(struct device * dev, pm_message_t state);
 338         int (*resume)(struct device * dev);
 339 };
 340
 341 /* interface for exporting device attributes */
 342 struct device_attribute {
 343         struct attribute        attr;
 344         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 345                         char *buf);
 346         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 347                          const char *buf, size_t count);
 348 };
 349
 350 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 351 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 352
 353 extern int __must_check device_create_file(struct device *device,
 354                                         struct device_attribute * entry);
 355 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 356 extern int __must_check device_create_bin_file(struct device *dev,
 357                                                struct bin_attribute *attr);
 358 extern void device_remove_bin_file(struct device *dev,
 359                                    struct bin_attribute *attr);
 360 extern int device_schedule_callback_owner(struct device *dev,
 361                 void (*func)(struct device *), struct module *owner);
 362
 363 /* This is a macro to avoid include problems with THIS_MODULE */
 364 #define device_schedule_callback(dev, func)                     \
 365         device_schedule_callback_owner(dev, func, THIS_MODULE)
 366
 367 /* device resource management */
 368 typedef void (*dr_release_t)(struct device *dev, void *res);
 369 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 370
 371 #ifdef CONFIG_DEBUG_DEVRES
 372 extern void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 373                              const char *name);
 374 #define devres_alloc(release, size, gfp) \
 375         __devres_alloc(release, size, gfp, #release)
 376 #else
 377 extern void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 378 #endif
 379 extern void devres_free(void *res);
 380 extern void devres_add(struct device *dev, void *res);
 381 extern void * devres_find(struct device *dev, dr_release_t release,
 382                           dr_match_t match, void *match_data);
 383 extern void * devres_get(struct device *dev, void *new_res,
 384                          dr_match_t match, void *match_data);
 385 extern void * devres_remove(struct device *dev, dr_release_t release,
 386                             dr_match_t match, void *match_data);
 387 extern int devres_destroy(struct device *dev, dr_release_t release,
 388                           dr_match_t match, void *match_data);
 389
 390 /* devres group */
 391 extern void * __must_check devres_open_group(struct device *dev, void *id,
 392                                              gfp_t gfp);
 393 extern void devres_close_group(struct device *dev, void *id);
 394 extern void devres_remove_group(struct device *dev, void *id);
 395 extern int devres_release_group(struct device *dev, void *id);
 396
 397 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 398 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 399 extern void devm_kfree(struct device *dev, void *p);
 400
 401 struct device {
 402         struct klist            klist_children;
 403         struct klist_node       knode_parent;           /* node in sibling list */
 404         struct klist_node       knode_driver;
 405         struct klist_node       knode_bus;
 406         struct device           *parent;
 407
 408         struct kobject kobj;
 409         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 410         struct device_type      *type;
 411         unsigned                is_registered:1;
 412         unsigned                uevent_suppress:1;
 413
 414         struct semaphore        sem;    /* semaphore to synchronize calls to
 415                                          * its driver.
 416                                          */
 417
 418         struct bus_type * bus;          /* type of bus device is on */
 419         struct device_driver *driver;   /* which driver has allocated this
 420                                            device */
 421         void            *driver_data;   /* data private to the driver */
 422         void            *platform_data; /* Platform specific data, device
 423                                            core doesn't touch it */
 424         struct dev_pm_info      power;
 425
 426 #ifdef CONFIG_NUMA
 427         int             numa_node;      /* NUMA node this device is close to */
 428 #endif
 429         u64             *dma_mask;      /* dma mask (if dma'able device) */
 430         u64             coherent_dma_mask;/* Like dma_mask, but for
 431                                              alloc_coherent mappings as
 432                                              not all hardware supports
 433                                              64 bit addresses for consistent
 434                                              allocations such descriptors. */
 435
 436         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 437
 438         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 439                                              override */
 440         /* arch specific additions */
 441         struct dev_archdata     archdata;
 442
 443         spinlock_t              devres_lock;
 444         struct list_head        devres_head;
 445
 446         /* class_device migration path */
 447         struct list_head        node;
 448         struct class            *class;
 449         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 450         struct attribute_group  **groups;       /* optional groups */
 451
 452         void    (*release)(struct device * dev);
 453 };
 454
 455 #ifdef CONFIG_NUMA
 456 static inline int dev_to_node(struct device *dev)
 457 {
 458         return dev->numa_node;
 459 }
 460 static inline void set_dev_node(struct device *dev, int node)
 461 {
 462         dev->numa_node = node;
 463 }
 464 #else
 465 static inline int dev_to_node(struct device *dev)
 466 {
 467         return -1;
 468 }
 469 static inline void set_dev_node(struct device *dev, int node)
 470 {
 471 }
 472 #endif
 473
 474 static inline void *
 475 dev_get_drvdata (struct device *dev)
 476 {
 477         return dev->driver_data;
 478 }
 479
 480 static inline void
 481 dev_set_drvdata (struct device *dev, void *data)
 482 {
 483         dev->driver_data = data;
 484 }
 485
 486 static inline int device_is_registered(struct device *dev)
 487 {
 488         return dev->is_registered;
 489 }
 490
 491 void driver_init(void);
 492
 493 /*
 494  * High level routines for use by the bus drivers
 495  */
 496 extern int __must_check device_register(struct device * dev);
 497 extern void device_unregister(struct device * dev);
 498 extern void device_initialize(struct device * dev);
 499 extern int __must_check device_add(struct device * dev);
 500 extern void device_del(struct device * dev);
 501 extern int device_for_each_child(struct device *, void *,
 502                      int (*fn)(struct device *, void *));
 503 extern struct device *device_find_child(struct device *, void *data,
 504                                         int (*match)(struct device *, void *));
 505 extern int device_rename(struct device *dev, char *new_name);
 506 extern int device_move(struct device *dev, struct device *new_parent);
 507
 508 /*
 509  * Manual binding of a device to driver. See drivers/base/bus.c
 510  * for information on use.
 511  */
 512 extern int __must_check device_bind_driver(struct device *dev);
 513 extern void device_release_driver(struct device * dev);
 514 extern int  __must_check device_attach(struct device * dev);
 515 extern int __must_check driver_attach(struct device_driver *drv);
 516 extern int __must_check device_reprobe(struct device *dev);
 517
 518 /*
 519  * Easy functions for dynamically creating devices on the fly
 520  */
 521 extern struct device *device_create(struct class *cls, struct device *parent,
 522                                     dev_t devt, const char *fmt, ...)
 523                                     __attribute__((format(printf,4,5)));
 524 extern void device_destroy(struct class *cls, dev_t devt);
 525 #ifdef CONFIG_PM_SLEEP
 526 extern void destroy_suspended_device(struct class *cls, dev_t devt);
 527 #else /* !CONFIG_PM_SLEEP */
 528 static inline void destroy_suspended_device(struct class *cls, dev_t devt)
 529 {
 530         device_destroy(cls, devt);
 531 }
 532 #endif /* !CONFIG_PM_SLEEP */
 533
 534 /*
 535  * Platform "fixup" functions - allow the platform to have their say
 536  * about devices and actions that the general device layer doesn't
 537  * know about.
 538  */
 539 /* Notify platform of device discovery */
 540 extern int (*platform_notify)(struct device * dev);
 541
 542 extern int (*platform_notify_remove)(struct device * dev);
 543
 544
 545 /**
 546  * get_device - atomically increment the reference count for the device.
 547  *
 548  */
 549 extern struct device * get_device(struct device * dev);
 550 extern void put_device(struct device * dev);
 551
 552
 553 /* drivers/base/power/shutdown.c */
 554 extern void device_shutdown(void);
 555
 556 /* drivers/base/sys.c */
 557 extern void sysdev_shutdown(void);
 558
 559 /* debugging and troubleshooting/diagnostic helpers. */
 560 extern const char *dev_driver_string(struct device *dev);
 561 #define dev_printk(level, dev, format, arg...)  \
 562         printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
 563
 564 #define dev_emerg(dev, format, arg...)          \
 565         dev_printk(KERN_EMERG , dev , format , ## arg)
 566 #define dev_alert(dev, format, arg...)          \
 567         dev_printk(KERN_ALERT , dev , format , ## arg)
 568 #define dev_crit(dev, format, arg...)           \
 569         dev_printk(KERN_CRIT , dev , format , ## arg)
 570 #define dev_err(dev, format, arg...)            \
 571         dev_printk(KERN_ERR , dev , format , ## arg)
 572 #define dev_warn(dev, format, arg...)           \
 573         dev_printk(KERN_WARNING , dev , format , ## arg)
 574 #define dev_notice(dev, format, arg...)         \
 575         dev_printk(KERN_NOTICE , dev , format , ## arg)
 576 #define dev_info(dev, format, arg...)           \
 577         dev_printk(KERN_INFO , dev , format , ## arg)
 578
 579 #ifdef DEBUG
 580 #define dev_dbg(dev, format, arg...)            \
 581         dev_printk(KERN_DEBUG , dev , format , ## arg)
 582 #else
 583 static inline int __attribute__ ((format (printf, 2, 3)))
 584 dev_dbg(struct device * dev, const char * fmt, ...)
 585 {
 586         return 0;
 587 }
 588 #endif
 589
 590 #ifdef VERBOSE_DEBUG
 591 #define dev_vdbg        dev_dbg
 592 #else
 593 static inline int __attribute__ ((format (printf, 2, 3)))
 594 dev_vdbg(struct device * dev, const char * fmt, ...)
 595 {
 596         return 0;
 597 }
 598 #endif
 599
 600 /* Create alias, so I can be autoloaded. */
 601 #define MODULE_ALIAS_CHARDEV(major,minor) \
 602         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 603 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 604         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 605 #endif /* _DEVICE_H_ */