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         struct module           * owner;
  55
  56         struct kset             subsys;
  57         struct kset             drivers;
  58         struct kset             devices;
  59         struct klist            klist_devices;
  60         struct klist            klist_drivers;
  61
  62         struct blocking_notifier_head bus_notifier;
  63
  64         struct bus_attribute    * bus_attrs;
  65         struct device_attribute * dev_attrs;
  66         struct driver_attribute * drv_attrs;
  67
  68         int             (*match)(struct device * dev, struct device_driver * drv);
  69         int             (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  70         int             (*probe)(struct device * dev);
  71         int             (*remove)(struct device * dev);
  72         void            (*shutdown)(struct device * dev);
  73
  74         int (*suspend)(struct device * dev, pm_message_t state);
  75         int (*suspend_late)(struct device * dev, pm_message_t state);
  76         int (*resume_early)(struct device * dev);
  77         int (*resume)(struct device * dev);
  78
  79         unsigned int drivers_autoprobe:1;
  80 };
  81
  82 extern int __must_check bus_register(struct bus_type * bus);
  83 extern void bus_unregister(struct bus_type * bus);
  84
  85 extern int __must_check bus_rescan_devices(struct bus_type * bus);
  86
  87 /* iterator helpers for buses */
  88
  89 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  90                      int (*fn)(struct device *, void *));
  91 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  92                                 void *data, int (*match)(struct device *, void *));
  93
  94 int __must_check bus_for_each_drv(struct bus_type *bus,
  95                 struct device_driver *start, void *data,
  96                 int (*fn)(struct device_driver *, void *));
  97
  98 /*
  99  * Bus notifiers: Get notified of addition/removal of devices
 100  * and binding/unbinding of drivers to devices.
 101  * In the long run, it should be a replacement for the platform
 102  * notify hooks.
 103  */
 104 struct notifier_block;
 105
 106 extern int bus_register_notifier(struct bus_type *bus,
 107                                  struct notifier_block *nb);
 108 extern int bus_unregister_notifier(struct bus_type *bus,
 109                                    struct notifier_block *nb);
 110
 111 /* All 4 notifers below get called with the target struct device *
 112  * as an argument. Note that those functions are likely to be called
 113  * with the device semaphore held in the core, so be careful.
 114  */
 115 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 116 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 117 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 118 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 119                                                       unbound */
 120
 121 struct device_driver {
 122         const char              * name;
 123         struct bus_type         * bus;
 124
 125         struct kobject          kobj;
 126         struct klist            klist_devices;
 127         struct klist_node       knode_bus;
 128
 129         struct module           * owner;
 130         const char              * mod_name;     /* used for built-in modules */
 131         struct module_kobject   * mkobj;
 132
 133         int     (*probe)        (struct device * dev);
 134         int     (*remove)       (struct device * dev);
 135         void    (*shutdown)     (struct device * dev);
 136         int     (*suspend)      (struct device * dev, pm_message_t state);
 137         int     (*resume)       (struct device * dev);
 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, struct bus_type *bus);
 147 extern int driver_probe_done(void);
 148
 149 /* sysfs interface for exporting driver attributes */
 150
 151 struct driver_attribute {
 152         struct attribute        attr;
 153         ssize_t (*show)(struct device_driver *, char * buf);
 154         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 155 };
 156
 157 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 158 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 159
 160 extern int __must_check driver_create_file(struct device_driver *,
 161                                         struct driver_attribute *);
 162 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 163
 164 extern int __must_check driver_for_each_device(struct device_driver * drv,
 165                 struct device *start, void *data,
 166                 int (*fn)(struct device *, void *));
 167 struct device * driver_find_device(struct device_driver *drv,
 168                                    struct device *start, void *data,
 169                                    int (*match)(struct device *, void *));
 170
 171 /*
 172  * device classes
 173  */
 174 struct class {
 175         const char              * name;
 176         struct module           * owner;
 177
 178         struct kset             subsys;
 179         struct list_head        children;
 180         struct list_head        devices;
 181         struct list_head        interfaces;
 182         struct kset             class_dirs;
 183         struct semaphore        sem;    /* locks both the children and interfaces lists */
 184
 185         struct class_attribute          * class_attrs;
 186         struct class_device_attribute   * class_dev_attrs;
 187         struct device_attribute         * dev_attrs;
 188
 189         int     (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 190         int     (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 191
 192         void    (*release)(struct class_device *dev);
 193         void    (*class_release)(struct class *class);
 194         void    (*dev_release)(struct device *dev);
 195
 196         int     (*suspend)(struct device *, pm_message_t state);
 197         int     (*resume)(struct device *);
 198 };
 199
 200 extern int __must_check class_register(struct class *);
 201 extern void class_unregister(struct class *);
 202
 203
 204 struct class_attribute {
 205         struct attribute        attr;
 206         ssize_t (*show)(struct class *, char * buf);
 207         ssize_t (*store)(struct class *, const char * buf, size_t count);
 208 };
 209
 210 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 211 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 212
 213 extern int __must_check class_create_file(struct class *,
 214                                         const struct class_attribute *);
 215 extern void class_remove_file(struct class *, const struct class_attribute *);
 216
 217 struct class_device_attribute {
 218         struct attribute        attr;
 219         ssize_t (*show)(struct class_device *, char * buf);
 220         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 221 };
 222
 223 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 224 struct class_device_attribute class_device_attr_##_name =       \
 225         __ATTR(_name,_mode,_show,_store)
 226
 227 extern int __must_check class_device_create_file(struct class_device *,
 228                                     const struct class_device_attribute *);
 229
 230 /**
 231  * struct class_device - class devices
 232  * @class: pointer to the parent class for this class device.  This is required.
 233  * @devt: for internal use by the driver core only.
 234  * @node: for internal use by the driver core only.
 235  * @kobj: for internal use by the driver core only.
 236  * @groups: optional additional groups to be created
 237  * @dev: if set, a symlink to the struct device is created in the sysfs
 238  * directory for this struct class device.
 239  * @class_data: pointer to whatever you want to store here for this struct
 240  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 241  * set this pointer.
 242  * @parent: pointer to a struct class_device that is the parent of this struct
 243  * class_device.  If NULL, this class_device will show up at the root of the
 244  * struct class in sysfs (which is probably what you want to have happen.)
 245  * @release: pointer to a release function for this struct class_device.  If
 246  * set, this will be called instead of the class specific release function.
 247  * Only use this if you want to override the default release function, like
 248  * when you are nesting class_device structures.
 249  * @uevent: pointer to a uevent function for this struct class_device.  If
 250  * set, this will be called instead of the class specific uevent function.
 251  * Only use this if you want to override the default uevent function, like
 252  * when you are nesting class_device structures.
 253  */
 254 struct class_device {
 255         struct list_head        node;
 256
 257         struct kobject          kobj;
 258         struct class            * class;        /* required */
 259         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 260         struct device           * dev;          /* not necessary, but nice to have */
 261         void                    * class_data;   /* class-specific data */
 262         struct class_device     *parent;        /* parent of this child device, if there is one */
 263         struct attribute_group  ** groups;      /* optional groups */
 264
 265         void    (*release)(struct class_device *dev);
 266         int     (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
 267         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 268 };
 269
 270 static inline void *
 271 class_get_devdata (struct class_device *dev)
 272 {
 273         return dev->class_data;
 274 }
 275
 276 static inline void
 277 class_set_devdata (struct class_device *dev, void *data)
 278 {
 279         dev->class_data = data;
 280 }
 281
 282
 283 extern int __must_check class_device_register(struct class_device *);
 284 extern void class_device_unregister(struct class_device *);
 285 extern void class_device_initialize(struct class_device *);
 286 extern int __must_check class_device_add(struct class_device *);
 287 extern void class_device_del(struct class_device *);
 288
 289 extern struct class_device * class_device_get(struct class_device *);
 290 extern void class_device_put(struct class_device *);
 291
 292 extern void class_device_remove_file(struct class_device *,
 293                                      const struct class_device_attribute *);
 294 extern int __must_check class_device_create_bin_file(struct class_device *,
 295                                         struct bin_attribute *);
 296 extern void class_device_remove_bin_file(struct class_device *,
 297                                          struct bin_attribute *);
 298
 299 struct class_interface {
 300         struct list_head        node;
 301         struct class            *class;
 302
 303         int (*add)      (struct class_device *, struct class_interface *);
 304         void (*remove)  (struct class_device *, struct class_interface *);
 305         int (*add_dev)          (struct device *, struct class_interface *);
 306         void (*remove_dev)      (struct device *, struct class_interface *);
 307 };
 308
 309 extern int __must_check class_interface_register(struct class_interface *);
 310 extern void class_interface_unregister(struct class_interface *);
 311
 312 extern struct class *class_create(struct module *owner, const char *name);
 313 extern void class_destroy(struct class *cls);
 314 extern struct class_device *class_device_create(struct class *cls,
 315                                                 struct class_device *parent,
 316                                                 dev_t devt,
 317                                                 struct device *device,
 318                                                 const char *fmt, ...)
 319                                         __attribute__((format(printf,5,6)));
 320 extern void class_device_destroy(struct class *cls, dev_t devt);
 321
 322 /*
 323  * The type of device, "struct device" is embedded in. A class
 324  * or bus can contain devices of different types
 325  * like "partitions" and "disks", "mouse" and "event".
 326  * This identifies the device type and carries type-specific
 327  * information, equivalent to the kobj_type of a kobject.
 328  * If "name" is specified, the uevent will contain it in
 329  * the DEVTYPE variable.
 330  */
 331 struct device_type {
 332         const char *name;
 333         struct attribute_group **groups;
 334         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 335         void (*release)(struct device *dev);
 336         int (*suspend)(struct device * dev, pm_message_t state);
 337         int (*resume)(struct device * dev);
 338 };
 339
 340 /* interface for exporting device attributes */
 341 struct device_attribute {
 342         struct attribute        attr;
 343         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 344                         char *buf);
 345         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 346                          const char *buf, size_t count);
 347 };
 348
 349 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 350 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 351
 352 extern int __must_check device_create_file(struct device *device,
 353                                         struct device_attribute * entry);
 354 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 355 extern int __must_check device_create_bin_file(struct device *dev,
 356                                                struct bin_attribute *attr);
 357 extern void device_remove_bin_file(struct device *dev,
 358                                    struct bin_attribute *attr);
 359 extern int device_schedule_callback_owner(struct device *dev,
 360                 void (*func)(struct device *), struct module *owner);
 361
 362 /* This is a macro to avoid include problems with THIS_MODULE */
 363 #define device_schedule_callback(dev, func)                     \
 364         device_schedule_callback_owner(dev, func, THIS_MODULE)
 365
 366 /* device resource management */
 367 typedef void (*dr_release_t)(struct device *dev, void *res);
 368 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 369
 370 #ifdef CONFIG_DEBUG_DEVRES
 371 extern void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 372                              const char *name);
 373 #define devres_alloc(release, size, gfp) \
 374         __devres_alloc(release, size, gfp, #release)
 375 #else
 376 extern void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 377 #endif
 378 extern void devres_free(void *res);
 379 extern void devres_add(struct device *dev, void *res);
 380 extern void * devres_find(struct device *dev, dr_release_t release,
 381                           dr_match_t match, void *match_data);
 382 extern void * devres_get(struct device *dev, void *new_res,
 383                          dr_match_t match, void *match_data);
 384 extern void * devres_remove(struct device *dev, dr_release_t release,
 385                             dr_match_t match, void *match_data);
 386 extern int devres_destroy(struct device *dev, dr_release_t release,
 387                           dr_match_t match, void *match_data);
 388
 389 /* devres group */
 390 extern void * __must_check devres_open_group(struct device *dev, void *id,
 391                                              gfp_t gfp);
 392 extern void devres_close_group(struct device *dev, void *id);
 393 extern void devres_remove_group(struct device *dev, void *id);
 394 extern int devres_release_group(struct device *dev, void *id);
 395
 396 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 397 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 398 extern void devm_kfree(struct device *dev, void *p);
 399
 400 struct device {
 401         struct klist            klist_children;
 402         struct klist_node       knode_parent;           /* node in sibling list */
 403         struct klist_node       knode_driver;
 404         struct klist_node       knode_bus;
 405         struct device           *parent;
 406
 407         struct kobject kobj;
 408         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 409         struct device_type      *type;
 410         unsigned                is_registered:1;
 411         unsigned                uevent_suppress:1;
 412
 413         struct semaphore        sem;    /* semaphore to synchronize calls to
 414                                          * its driver.
 415                                          */
 416
 417         struct bus_type * bus;          /* type of bus device is on */
 418         struct device_driver *driver;   /* which driver has allocated this
 419                                            device */
 420         void            *driver_data;   /* data private to the driver */
 421         void            *platform_data; /* Platform specific data, device
 422                                            core doesn't touch it */
 423         struct dev_pm_info      power;
 424
 425 #ifdef CONFIG_NUMA
 426         int             numa_node;      /* NUMA node this device is close to */
 427 #endif
 428         u64             *dma_mask;      /* dma mask (if dma'able device) */
 429         u64             coherent_dma_mask;/* Like dma_mask, but for
 430                                              alloc_coherent mappings as
 431                                              not all hardware supports
 432                                              64 bit addresses for consistent
 433                                              allocations such descriptors. */
 434
 435         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 436
 437         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 438                                              override */
 439         /* arch specific additions */
 440         struct dev_archdata     archdata;
 441
 442         spinlock_t              devres_lock;
 443         struct list_head        devres_head;
 444
 445         /* class_device migration path */
 446         struct list_head        node;
 447         struct class            *class;
 448         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 449         struct attribute_group  **groups;       /* optional groups */
 450
 451         void    (*release)(struct device * dev);
 452 };
 453
 454 #ifdef CONFIG_NUMA
 455 static inline int dev_to_node(struct device *dev)
 456 {
 457         return dev->numa_node;
 458 }
 459 static inline void set_dev_node(struct device *dev, int node)
 460 {
 461         dev->numa_node = node;
 462 }
 463 #else
 464 static inline int dev_to_node(struct device *dev)
 465 {
 466         return -1;
 467 }
 468 static inline void set_dev_node(struct device *dev, int node)
 469 {
 470 }
 471 #endif
 472
 473 static inline void *
 474 dev_get_drvdata (struct device *dev)
 475 {
 476         return dev->driver_data;
 477 }
 478
 479 static inline void
 480 dev_set_drvdata (struct device *dev, void *data)
 481 {
 482         dev->driver_data = data;
 483 }
 484
 485 static inline int device_is_registered(struct device *dev)
 486 {
 487         return dev->is_registered;
 488 }
 489
 490 void driver_init(void);
 491
 492 /*
 493  * High level routines for use by the bus drivers
 494  */
 495 extern int __must_check device_register(struct device * dev);
 496 extern void device_unregister(struct device * dev);
 497 extern void device_initialize(struct device * dev);
 498 extern int __must_check device_add(struct device * dev);
 499 extern void device_del(struct device * dev);
 500 extern int device_for_each_child(struct device *, void *,
 501                      int (*fn)(struct device *, void *));
 502 extern struct device *device_find_child(struct device *, void *data,
 503                                         int (*match)(struct device *, void *));
 504 extern int device_rename(struct device *dev, char *new_name);
 505 extern int device_move(struct device *dev, struct device *new_parent);
 506
 507 /*
 508  * Manual binding of a device to driver. See drivers/base/bus.c
 509  * for information on use.
 510  */
 511 extern int __must_check device_bind_driver(struct device *dev);
 512 extern void device_release_driver(struct device * dev);
 513 extern int  __must_check device_attach(struct device * dev);
 514 extern int __must_check driver_attach(struct device_driver *drv);
 515 extern int __must_check device_reprobe(struct device *dev);
 516
 517 /*
 518  * Easy functions for dynamically creating devices on the fly
 519  */
 520 extern struct device *device_create(struct class *cls, struct device *parent,
 521                                     dev_t devt, const char *fmt, ...)
 522                                     __attribute__((format(printf,4,5)));
 523 extern void device_destroy(struct class *cls, dev_t devt);
 524
 525 /*
 526  * Platform "fixup" functions - allow the platform to have their say
 527  * about devices and actions that the general device layer doesn't
 528  * know about.
 529  */
 530 /* Notify platform of device discovery */
 531 extern int (*platform_notify)(struct device * dev);
 532
 533 extern int (*platform_notify_remove)(struct device * dev);
 534
 535
 536 /**
 537  * get_device - atomically increment the reference count for the device.
 538  *
 539  */
 540 extern struct device * get_device(struct device * dev);
 541 extern void put_device(struct device * dev);
 542
 543
 544 /* drivers/base/power/shutdown.c */
 545 extern void device_shutdown(void);
 546
 547 /* drivers/base/sys.c */
 548 extern void sysdev_shutdown(void);
 549
 550
 551 /* drivers/base/firmware.c */
 552 extern int __must_check firmware_register(struct kset *);
 553 extern void firmware_unregister(struct kset *);
 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 #ifdef DEBUG
 561 #define dev_dbg(dev, format, arg...)            \
 562         dev_printk(KERN_DEBUG , dev , format , ## arg)
 563 #else
 564 static inline int __attribute__ ((format (printf, 2, 3)))
 565 dev_dbg(struct device * dev, const char * fmt, ...)
 566 {
 567         return 0;
 568 }
 569 #endif
 570
 571 #ifdef VERBOSE_DEBUG
 572 #define dev_vdbg        dev_dbg
 573 #else
 574 static inline int __attribute__ ((format (printf, 2, 3)))
 575 dev_vdbg(struct device * dev, const char * fmt, ...)
 576 {
 577         return 0;
 578 }
 579 #endif
 580
 581 #define dev_err(dev, format, arg...)            \
 582         dev_printk(KERN_ERR , dev , format , ## arg)
 583 #define dev_info(dev, format, arg...)           \
 584         dev_printk(KERN_INFO , dev , format , ## arg)
 585 #define dev_warn(dev, format, arg...)           \
 586         dev_printk(KERN_WARNING , dev , format , ## arg)
 587 #define dev_notice(dev, format, arg...)         \
 588         dev_printk(KERN_NOTICE , dev , format , ## arg)
 589
 590 /* Create alias, so I can be autoloaded. */
 591 #define MODULE_ALIAS_CHARDEV(major,minor) \
 592         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 593 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 594         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 595 #endif /* _DEVICE_H_ */