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 /* DEVICE_NAME_HALF is really less than half to accommodate slop */
  29 #define DEVICE_NAME_HALF        __stringify(20)
  30 #define DEVICE_ID_SIZE          32
  31 #define BUS_ID_SIZE             KOBJ_NAME_LEN
  32
  33
  34 struct device;
  35 struct device_driver;
  36 struct driver_private;
  37 struct class;
  38 struct class_device;
  39 struct bus_type;
  40 struct bus_type_private;
  41
  42 struct bus_attribute {
  43         struct attribute        attr;
  44         ssize_t (*show)(struct bus_type *bus, char *buf);
  45         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  46 };
  47
  48 #define BUS_ATTR(_name, _mode, _show, _store)   \
  49 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  50
  51 extern int __must_check bus_create_file(struct bus_type *,
  52                                         struct bus_attribute *);
  53 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  54
  55 struct bus_type {
  56         const char              *name;
  57         struct bus_attribute    *bus_attrs;
  58         struct device_attribute *dev_attrs;
  59         struct driver_attribute *drv_attrs;
  60
  61         int (*match)(struct device *dev, struct device_driver *drv);
  62         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  63         int (*probe)(struct device *dev);
  64         int (*remove)(struct device *dev);
  65         void (*shutdown)(struct device *dev);
  66
  67         int (*suspend)(struct device *dev, pm_message_t state);
  68         int (*suspend_late)(struct device *dev, pm_message_t state);
  69         int (*resume_early)(struct device *dev);
  70         int (*resume)(struct device *dev);
  71
  72         struct bus_type_private *p;
  73 };
  74
  75 extern int __must_check bus_register(struct bus_type *bus);
  76 extern void bus_unregister(struct bus_type *bus);
  77
  78 extern int __must_check bus_rescan_devices(struct bus_type *bus);
  79
  80 /* iterator helpers for buses */
  81
  82 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
  83                      int (*fn)(struct device *dev, void *data));
  84 struct device *bus_find_device(struct bus_type *bus, struct device *start,
  85                                void *data,
  86                                int (*match)(struct device *dev, void *data));
  87
  88 int __must_check bus_for_each_drv(struct bus_type *bus,
  89                                   struct device_driver *start, void *data,
  90                                   int (*fn)(struct device_driver *, void *));
  91
  92 /*
  93  * Bus notifiers: Get notified of addition/removal of devices
  94  * and binding/unbinding of drivers to devices.
  95  * In the long run, it should be a replacement for the platform
  96  * notify hooks.
  97  */
  98 struct notifier_block;
  99
 100 extern int bus_register_notifier(struct bus_type *bus,
 101                                  struct notifier_block *nb);
 102 extern int bus_unregister_notifier(struct bus_type *bus,
 103                                    struct notifier_block *nb);
 104
 105 /* All 4 notifers below get called with the target struct device *
 106  * as an argument. Note that those functions are likely to be called
 107  * with the device semaphore held in the core, so be careful.
 108  */
 109 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 110 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 111 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 112 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 113                                                       unbound */
 114
 115 extern struct kset *bus_get_kset(struct bus_type *bus);
 116 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 117
 118 struct device_driver {
 119         const char              *name;
 120         struct bus_type         *bus;
 121
 122         struct module           *owner;
 123         const char              *mod_name;      /* used for built-in modules */
 124
 125         int (*probe) (struct device *dev);
 126         int (*remove) (struct device *dev);
 127         void (*shutdown) (struct device *dev);
 128         int (*suspend) (struct device *dev, pm_message_t state);
 129         int (*resume) (struct device *dev);
 130         struct attribute_group **groups;
 131
 132         struct driver_private *p;
 133 };
 134
 135
 136 extern int __must_check driver_register(struct device_driver *drv);
 137 extern void driver_unregister(struct device_driver *drv);
 138
 139 extern struct device_driver *get_driver(struct device_driver *drv);
 140 extern void put_driver(struct device_driver *drv);
 141 extern struct device_driver *driver_find(const char *name,
 142                                          struct bus_type *bus);
 143 extern int driver_probe_done(void);
 144
 145 /* sysfs interface for exporting driver attributes */
 146
 147 struct driver_attribute {
 148         struct attribute attr;
 149         ssize_t (*show)(struct device_driver *driver, char *buf);
 150         ssize_t (*store)(struct device_driver *driver, const char *buf,
 151                          size_t count);
 152 };
 153
 154 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 155 struct driver_attribute driver_attr_##_name =           \
 156         __ATTR(_name, _mode, _show, _store)
 157
 158 extern int __must_check driver_create_file(struct device_driver *driver,
 159                                            struct driver_attribute *attr);
 160 extern void driver_remove_file(struct device_driver *driver,
 161                                struct driver_attribute *attr);
 162
 163 extern int __must_check driver_add_kobj(struct device_driver *drv,
 164                                         struct kobject *kobj,
 165                                         const char *fmt, ...);
 166
 167 extern int __must_check driver_for_each_device(struct device_driver *drv,
 168                                                struct device *start,
 169                                                void *data,
 170                                                int (*fn)(struct device *dev,
 171                                                          void *));
 172 struct device *driver_find_device(struct device_driver *drv,
 173                                   struct device *start, void *data,
 174                                   int (*match)(struct device *dev, void *data));
 175
 176 /*
 177  * device classes
 178  */
 179 struct class {
 180         const char              *name;
 181         struct module           *owner;
 182
 183         struct kset             subsys;
 184         struct list_head        children;
 185         struct list_head        devices;
 186         struct list_head        interfaces;
 187         struct kset             class_dirs;
 188         struct semaphore        sem; /* locks children, devices, interfaces */
 189         struct class_attribute          *class_attrs;
 190         struct class_device_attribute   *class_dev_attrs;
 191         struct device_attribute         *dev_attrs;
 192
 193         int (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 194         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 195
 196         void (*release)(struct class_device *dev);
 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
 204 extern int __must_check class_register(struct class *class);
 205 extern void class_unregister(struct class *class);
 206 extern int class_for_each_device(struct class *class, void *data,
 207                                  int (*fn)(struct device *dev, void *data));
 208 extern struct device *class_find_device(struct class *class, void *data,
 209                                         int (*match)(struct device *, void *));
 210 extern struct class_device *class_find_child(struct class *class, void *data,
 211                                    int (*match)(struct class_device *, void *));
 212
 213
 214 struct class_attribute {
 215         struct attribute attr;
 216         ssize_t (*show)(struct class *class, char *buf);
 217         ssize_t (*store)(struct class *class, const char *buf, size_t count);
 218 };
 219
 220 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 221 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 222
 223 extern int __must_check class_create_file(struct class *class,
 224                                           const struct class_attribute *attr);
 225 extern void class_remove_file(struct class *class,
 226                               const struct class_attribute *attr);
 227
 228 struct class_device_attribute {
 229         struct attribute attr;
 230         ssize_t (*show)(struct class_device *, char *buf);
 231         ssize_t (*store)(struct class_device *, const char *buf, size_t count);
 232 };
 233
 234 #define CLASS_DEVICE_ATTR(_name, _mode, _show, _store)          \
 235 struct class_device_attribute class_device_attr_##_name =       \
 236         __ATTR(_name, _mode, _show, _store)
 237
 238 extern int __must_check class_device_create_file(struct class_device *,
 239                                     const struct class_device_attribute *);
 240
 241 /**
 242  * struct class_device - class devices
 243  * @class: pointer to the parent class for this class device.  This is required.
 244  * @devt: for internal use by the driver core only.
 245  * @node: for internal use by the driver core only.
 246  * @kobj: for internal use by the driver core only.
 247  * @groups: optional additional groups to be created
 248  * @dev: if set, a symlink to the struct device is created in the sysfs
 249  * directory for this struct class device.
 250  * @class_data: pointer to whatever you want to store here for this struct
 251  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 252  * set this pointer.
 253  * @parent: pointer to a struct class_device that is the parent of this struct
 254  * class_device.  If NULL, this class_device will show up at the root of the
 255  * struct class in sysfs (which is probably what you want to have happen.)
 256  * @release: pointer to a release function for this struct class_device.  If
 257  * set, this will be called instead of the class specific release function.
 258  * Only use this if you want to override the default release function, like
 259  * when you are nesting class_device structures.
 260  * @uevent: pointer to a uevent function for this struct class_device.  If
 261  * set, this will be called instead of the class specific uevent function.
 262  * Only use this if you want to override the default uevent function, like
 263  * when you are nesting class_device structures.
 264  */
 265 struct class_device {
 266         struct list_head        node;
 267
 268         struct kobject          kobj;
 269         struct class            *class;
 270         dev_t                   devt;
 271         struct device           *dev;
 272         void                    *class_data;
 273         struct class_device     *parent;
 274         struct attribute_group  **groups;
 275
 276         void (*release)(struct class_device *dev);
 277         int (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 278         char class_id[BUS_ID_SIZE];
 279 };
 280
 281 static inline void *class_get_devdata(struct class_device *dev)
 282 {
 283         return dev->class_data;
 284 }
 285
 286 static inline void class_set_devdata(struct class_device *dev, void *data)
 287 {
 288         dev->class_data = data;
 289 }
 290
 291
 292 extern int __must_check class_device_register(struct class_device *);
 293 extern void class_device_unregister(struct class_device *);
 294 extern void class_device_initialize(struct class_device *);
 295 extern int __must_check class_device_add(struct class_device *);
 296 extern void class_device_del(struct class_device *);
 297
 298 extern struct class_device *class_device_get(struct class_device *);
 299 extern void class_device_put(struct class_device *);
 300
 301 extern void class_device_remove_file(struct class_device *,
 302                                      const struct class_device_attribute *);
 303 extern int __must_check class_device_create_bin_file(struct class_device *,
 304                                         struct bin_attribute *);
 305 extern void class_device_remove_bin_file(struct class_device *,
 306                                          struct bin_attribute *);
 307
 308 struct class_interface {
 309         struct list_head        node;
 310         struct class            *class;
 311
 312         int (*add)      (struct class_device *, struct class_interface *);
 313         void (*remove)  (struct class_device *, struct class_interface *);
 314         int (*add_dev)          (struct device *, struct class_interface *);
 315         void (*remove_dev)      (struct device *, struct class_interface *);
 316 };
 317
 318 extern int __must_check class_interface_register(struct class_interface *);
 319 extern void class_interface_unregister(struct class_interface *);
 320
 321 extern struct class *class_create(struct module *owner, const char *name);
 322 extern void class_destroy(struct class *cls);
 323 extern struct class_device *class_device_create(struct class *cls,
 324                                                 struct class_device *parent,
 325                                                 dev_t devt,
 326                                                 struct device *device,
 327                                                 const char *fmt, ...)
 328                                         __attribute__((format(printf, 5, 6)));
 329 extern void class_device_destroy(struct class *cls, dev_t devt);
 330
 331 /*
 332  * The type of device, "struct device" is embedded in. A class
 333  * or bus can contain devices of different types
 334  * like "partitions" and "disks", "mouse" and "event".
 335  * This identifies the device type and carries type-specific
 336  * information, equivalent to the kobj_type of a kobject.
 337  * If "name" is specified, the uevent will contain it in
 338  * the DEVTYPE variable.
 339  */
 340 struct device_type {
 341         const char *name;
 342         struct attribute_group **groups;
 343         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 344         void (*release)(struct device *dev);
 345         int (*suspend)(struct device *dev, pm_message_t state);
 346         int (*resume)(struct device *dev);
 347 };
 348
 349 /* interface for exporting device attributes */
 350 struct device_attribute {
 351         struct attribute        attr;
 352         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 353                         char *buf);
 354         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 355                          const char *buf, size_t count);
 356 };
 357
 358 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 359 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 360
 361 extern int __must_check device_create_file(struct device *device,
 362                                            struct device_attribute *entry);
 363 extern void device_remove_file(struct device *dev,
 364                                struct device_attribute *attr);
 365 extern int __must_check device_create_bin_file(struct device *dev,
 366                                                struct bin_attribute *attr);
 367 extern void device_remove_bin_file(struct device *dev,
 368                                    struct bin_attribute *attr);
 369 extern int device_schedule_callback_owner(struct device *dev,
 370                 void (*func)(struct device *dev), struct module *owner);
 371
 372 /* This is a macro to avoid include problems with THIS_MODULE */
 373 #define device_schedule_callback(dev, func)                     \
 374         device_schedule_callback_owner(dev, func, THIS_MODULE)
 375
 376 /* device resource management */
 377 typedef void (*dr_release_t)(struct device *dev, void *res);
 378 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 379
 380 #ifdef CONFIG_DEBUG_DEVRES
 381 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 382                              const char *name);
 383 #define devres_alloc(release, size, gfp) \
 384         __devres_alloc(release, size, gfp, #release)
 385 #else
 386 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 387 #endif
 388 extern void devres_free(void *res);
 389 extern void devres_add(struct device *dev, void *res);
 390 extern void *devres_find(struct device *dev, dr_release_t release,
 391                          dr_match_t match, void *match_data);
 392 extern void *devres_get(struct device *dev, void *new_res,
 393                         dr_match_t match, void *match_data);
 394 extern void *devres_remove(struct device *dev, dr_release_t release,
 395                            dr_match_t match, void *match_data);
 396 extern int devres_destroy(struct device *dev, dr_release_t release,
 397                           dr_match_t match, void *match_data);
 398
 399 /* devres group */
 400 extern void * __must_check devres_open_group(struct device *dev, void *id,
 401                                              gfp_t gfp);
 402 extern void devres_close_group(struct device *dev, void *id);
 403 extern void devres_remove_group(struct device *dev, void *id);
 404 extern int devres_release_group(struct device *dev, void *id);
 405
 406 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 407 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 408 extern void devm_kfree(struct device *dev, void *p);
 409
 410 struct device {
 411         struct klist            klist_children;
 412         struct klist_node       knode_parent;   /* node in sibling list */
 413         struct klist_node       knode_driver;
 414         struct klist_node       knode_bus;
 415         struct device           *parent;
 416
 417         struct kobject kobj;
 418         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 419         struct device_type      *type;
 420         unsigned                is_registered:1;
 421         unsigned                uevent_suppress:1;
 422
 423         struct semaphore        sem;    /* semaphore to synchronize calls to
 424                                          * its driver.
 425                                          */
 426
 427         struct bus_type *bus;           /* type of bus device is on */
 428         struct device_driver *driver;   /* which driver has allocated this
 429                                            device */
 430         void            *driver_data;   /* data private to the driver */
 431         void            *platform_data; /* Platform specific data, device
 432                                            core doesn't touch it */
 433         struct dev_pm_info      power;
 434
 435 #ifdef CONFIG_NUMA
 436         int             numa_node;      /* NUMA node this device is close to */
 437 #endif
 438         u64             *dma_mask;      /* dma mask (if dma'able device) */
 439         u64             coherent_dma_mask;/* Like dma_mask, but for
 440                                              alloc_coherent mappings as
 441                                              not all hardware supports
 442                                              64 bit addresses for consistent
 443                                              allocations such descriptors. */
 444
 445         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 446
 447         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 448                                              override */
 449         /* arch specific additions */
 450         struct dev_archdata     archdata;
 451
 452         spinlock_t              devres_lock;
 453         struct list_head        devres_head;
 454
 455         /* class_device migration path */
 456         struct list_head        node;
 457         struct class            *class;
 458         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 459         struct attribute_group  **groups;       /* optional groups */
 460
 461         void    (*release)(struct device *dev);
 462 };
 463
 464 #ifdef CONFIG_NUMA
 465 static inline int dev_to_node(struct device *dev)
 466 {
 467         return dev->numa_node;
 468 }
 469 static inline void set_dev_node(struct device *dev, int node)
 470 {
 471         dev->numa_node = node;
 472 }
 473 #else
 474 static inline int dev_to_node(struct device *dev)
 475 {
 476         return -1;
 477 }
 478 static inline void set_dev_node(struct device *dev, int node)
 479 {
 480 }
 481 #endif
 482
 483 static inline void *dev_get_drvdata(struct device *dev)
 484 {
 485         return dev->driver_data;
 486 }
 487
 488 static inline void dev_set_drvdata(struct device *dev, void *data)
 489 {
 490         dev->driver_data = data;
 491 }
 492
 493 static inline int device_is_registered(struct device *dev)
 494 {
 495         return dev->is_registered;
 496 }
 497
 498 void driver_init(void);
 499
 500 /*
 501  * High level routines for use by the bus drivers
 502  */
 503 extern int __must_check device_register(struct device *dev);
 504 extern void device_unregister(struct device *dev);
 505 extern void device_initialize(struct device *dev);
 506 extern int __must_check device_add(struct device *dev);
 507 extern void device_del(struct device *dev);
 508 extern int device_for_each_child(struct device *dev, void *data,
 509                      int (*fn)(struct device *dev, void *data));
 510 extern struct device *device_find_child(struct device *dev, void *data,
 511                                 int (*match)(struct device *dev, void *data));
 512 extern int device_rename(struct device *dev, char *new_name);
 513 extern int device_move(struct device *dev, struct device *new_parent);
 514
 515 /*
 516  * Manual binding of a device to driver. See drivers/base/bus.c
 517  * for information on use.
 518  */
 519 extern int __must_check device_bind_driver(struct device *dev);
 520 extern void device_release_driver(struct device *dev);
 521 extern int  __must_check device_attach(struct device *dev);
 522 extern int __must_check driver_attach(struct device_driver *drv);
 523 extern int __must_check device_reprobe(struct device *dev);
 524
 525 /*
 526  * Easy functions for dynamically creating devices on the fly
 527  */
 528 extern struct device *device_create(struct class *cls, struct device *parent,
 529                                     dev_t devt, const char *fmt, ...)
 530                                     __attribute__((format(printf, 4, 5)));
 531 extern void device_destroy(struct class *cls, dev_t devt);
 532 #ifdef CONFIG_PM_SLEEP
 533 extern void destroy_suspended_device(struct class *cls, dev_t devt);
 534 #else /* !CONFIG_PM_SLEEP */
 535 static inline void destroy_suspended_device(struct class *cls, dev_t devt)
 536 {
 537         device_destroy(cls, devt);
 538 }
 539 #endif /* !CONFIG_PM_SLEEP */
 540
 541 /*
 542  * Platform "fixup" functions - allow the platform to have their say
 543  * about devices and actions that the general device layer doesn't
 544  * know about.
 545  */
 546 /* Notify platform of device discovery */
 547 extern int (*platform_notify)(struct device *dev);
 548
 549 extern int (*platform_notify_remove)(struct device *dev);
 550
 551
 552 /**
 553  * get_device - atomically increment the reference count for the device.
 554  *
 555  */
 556 extern struct device *get_device(struct device *dev);
 557 extern void put_device(struct device *dev);
 558
 559
 560 /* drivers/base/power/shutdown.c */
 561 extern void device_shutdown(void);
 562
 563 /* drivers/base/sys.c */
 564 extern void sysdev_shutdown(void);
 565
 566 /* debugging and troubleshooting/diagnostic helpers. */
 567 extern const char *dev_driver_string(struct device *dev);
 568 #define dev_printk(level, dev, format, arg...)  \
 569         printk(level "%s %s: " format , dev_driver_string(dev) , \
 570                (dev)->bus_id , ## arg)
 571
 572 #define dev_emerg(dev, format, arg...)          \
 573         dev_printk(KERN_EMERG , dev , format , ## arg)
 574 #define dev_alert(dev, format, arg...)          \
 575         dev_printk(KERN_ALERT , dev , format , ## arg)
 576 #define dev_crit(dev, format, arg...)           \
 577         dev_printk(KERN_CRIT , dev , format , ## arg)
 578 #define dev_err(dev, format, arg...)            \
 579         dev_printk(KERN_ERR , dev , format , ## arg)
 580 #define dev_warn(dev, format, arg...)           \
 581         dev_printk(KERN_WARNING , dev , format , ## arg)
 582 #define dev_notice(dev, format, arg...)         \
 583         dev_printk(KERN_NOTICE , dev , format , ## arg)
 584 #define dev_info(dev, format, arg...)           \
 585         dev_printk(KERN_INFO , dev , format , ## arg)
 586
 587 #ifdef DEBUG
 588 #define dev_dbg(dev, format, arg...)            \
 589         dev_printk(KERN_DEBUG , dev , format , ## arg)
 590 #else
 591 static inline int __attribute__ ((format (printf, 2, 3)))
 592 dev_dbg(struct device *dev, const char *fmt, ...)
 593 {
 594         return 0;
 595 }
 596 #endif
 597
 598 #ifdef VERBOSE_DEBUG
 599 #define dev_vdbg        dev_dbg
 600 #else
 601 static inline int __attribute__ ((format (printf, 2, 3)))
 602 dev_vdbg(struct device *dev, const char *fmt, ...)
 603 {
 604         return 0;
 605 }
 606 #endif
 607
 608 /* Create alias, so I can be autoloaded. */
 609 #define MODULE_ALIAS_CHARDEV(major,minor) \
 610         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 611 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 612         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 613 #endif /* _DEVICE_H_ */