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 subsystem        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         struct bus_attribute drivers_autoprobe_attr;
  68         struct bus_attribute drivers_probe_attr;
  69
  70         int             (*match)(struct device * dev, struct device_driver * drv);
  71         int             (*uevent)(struct device *dev, char **envp,
  72                                   int num_envp, char *buffer, int buffer_size);
  73         int             (*probe)(struct device * dev);
  74         int             (*remove)(struct device * dev);
  75         void            (*shutdown)(struct device * dev);
  76
  77         int (*suspend)(struct device * dev, pm_message_t state);
  78         int (*suspend_late)(struct device * dev, pm_message_t state);
  79         int (*resume_early)(struct device * dev);
  80         int (*resume)(struct device * dev);
  81
  82         unsigned int drivers_autoprobe:1;
  83         unsigned int multithread_probe:1;
  84 };
  85
  86 extern int __must_check bus_register(struct bus_type * bus);
  87 extern void bus_unregister(struct bus_type * bus);
  88
  89 extern int __must_check bus_rescan_devices(struct bus_type * bus);
  90
  91 /* iterator helpers for buses */
  92
  93 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  94                      int (*fn)(struct device *, void *));
  95 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  96                                 void *data, int (*match)(struct device *, void *));
  97
  98 int __must_check bus_for_each_drv(struct bus_type *bus,
  99                 struct device_driver *start, void *data,
 100                 int (*fn)(struct device_driver *, void *));
 101
 102 /*
 103  * Bus notifiers: Get notified of addition/removal of devices
 104  * and binding/unbinding of drivers to devices.
 105  * In the long run, it should be a replacement for the platform
 106  * notify hooks.
 107  */
 108 struct notifier_block;
 109
 110 extern int bus_register_notifier(struct bus_type *bus,
 111                                  struct notifier_block *nb);
 112 extern int bus_unregister_notifier(struct bus_type *bus,
 113                                    struct notifier_block *nb);
 114
 115 /* All 4 notifers below get called with the target struct device *
 116  * as an argument. Note that those functions are likely to be called
 117  * with the device semaphore held in the core, so be careful.
 118  */
 119 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 120 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 121 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 122 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 123                                                       unbound */
 124
 125 struct device_driver {
 126         const char              * name;
 127         struct bus_type         * bus;
 128
 129         struct kobject          kobj;
 130         struct klist            klist_devices;
 131         struct klist_node       knode_bus;
 132
 133         struct module           * owner;
 134         const char              * mod_name;     /* used for built-in modules */
 135         struct module_kobject   * mkobj;
 136
 137         int     (*probe)        (struct device * dev);
 138         int     (*remove)       (struct device * dev);
 139         void    (*shutdown)     (struct device * dev);
 140         int     (*suspend)      (struct device * dev, pm_message_t state);
 141         int     (*resume)       (struct device * dev);
 142 };
 143
 144
 145 extern int __must_check driver_register(struct device_driver * drv);
 146 extern void driver_unregister(struct device_driver * drv);
 147
 148 extern struct device_driver * get_driver(struct device_driver * drv);
 149 extern void put_driver(struct device_driver * drv);
 150 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 151 extern int driver_probe_done(void);
 152
 153 /* sysfs interface for exporting driver attributes */
 154
 155 struct driver_attribute {
 156         struct attribute        attr;
 157         ssize_t (*show)(struct device_driver *, char * buf);
 158         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 159 };
 160
 161 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 162 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 163
 164 extern int __must_check driver_create_file(struct device_driver *,
 165                                         struct driver_attribute *);
 166 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 167
 168 extern int __must_check driver_for_each_device(struct device_driver * drv,
 169                 struct device *start, void *data,
 170                 int (*fn)(struct device *, void *));
 171 struct device * driver_find_device(struct device_driver *drv,
 172                                    struct device *start, void *data,
 173                                    int (*match)(struct device *, void *));
 174
 175 /*
 176  * device classes
 177  */
 178 struct class {
 179         const char              * name;
 180         struct module           * owner;
 181
 182         struct subsystem        subsys;
 183         struct list_head        children;
 184         struct list_head        devices;
 185         struct list_head        interfaces;
 186         struct kset             class_dirs;
 187         struct semaphore        sem;    /* locks both the children and interfaces lists */
 188
 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, char **envp,
 194                            int num_envp, char *buffer, int buffer_size);
 195         int     (*dev_uevent)(struct device *dev, char **envp, int num_envp,
 196                                 char *buffer, int buffer_size);
 197
 198         void    (*release)(struct class_device *dev);
 199         void    (*class_release)(struct class *class);
 200         void    (*dev_release)(struct device *dev);
 201
 202         int     (*suspend)(struct device *, pm_message_t state);
 203         int     (*resume)(struct device *);
 204 };
 205
 206 extern int __must_check class_register(struct class *);
 207 extern void class_unregister(struct class *);
 208
 209
 210 struct class_attribute {
 211         struct attribute        attr;
 212         ssize_t (*show)(struct class *, char * buf);
 213         ssize_t (*store)(struct class *, const char * buf, size_t count);
 214 };
 215
 216 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 217 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 218
 219 extern int __must_check class_create_file(struct class *,
 220                                         const struct class_attribute *);
 221 extern void class_remove_file(struct class *, const struct class_attribute *);
 222
 223 struct class_device_attribute {
 224         struct attribute        attr;
 225         ssize_t (*show)(struct class_device *, char * buf);
 226         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 227 };
 228
 229 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 230 struct class_device_attribute class_device_attr_##_name =       \
 231         __ATTR(_name,_mode,_show,_store)
 232
 233 extern int __must_check class_device_create_file(struct class_device *,
 234                                     const struct class_device_attribute *);
 235
 236 /**
 237  * struct class_device - class devices
 238  * @class: pointer to the parent class for this class device.  This is required.
 239  * @devt: for internal use by the driver core only.
 240  * @node: for internal use by the driver core only.
 241  * @kobj: for internal use by the driver core only.
 242  * @devt_attr: for internal use by the driver core only.
 243  * @groups: optional additional groups to be created
 244  * @dev: if set, a symlink to the struct device is created in the sysfs
 245  * directory for this struct class device.
 246  * @class_data: pointer to whatever you want to store here for this struct
 247  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 248  * set this pointer.
 249  * @parent: pointer to a struct class_device that is the parent of this struct
 250  * class_device.  If NULL, this class_device will show up at the root of the
 251  * struct class in sysfs (which is probably what you want to have happen.)
 252  * @release: pointer to a release function for this struct class_device.  If
 253  * set, this will be called instead of the class specific release function.
 254  * Only use this if you want to override the default release function, like
 255  * when you are nesting class_device structures.
 256  * @uevent: pointer to a uevent function for this struct class_device.  If
 257  * set, this will be called instead of the class specific uevent function.
 258  * Only use this if you want to override the default uevent function, like
 259  * when you are nesting class_device structures.
 260  */
 261 struct class_device {
 262         struct list_head        node;
 263
 264         struct kobject          kobj;
 265         struct class            * class;        /* required */
 266         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 267         struct class_device_attribute *devt_attr;
 268         struct class_device_attribute uevent_attr;
 269         struct device           * dev;          /* not necessary, but nice to have */
 270         void                    * class_data;   /* class-specific data */
 271         struct class_device     *parent;        /* parent of this child device, if there is one */
 272         struct attribute_group  ** groups;      /* optional groups */
 273
 274         void    (*release)(struct class_device *dev);
 275         int     (*uevent)(struct class_device *dev, char **envp,
 276                            int num_envp, char *buffer, int buffer_size);
 277         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 278 };
 279
 280 static inline void *
 281 class_get_devdata (struct class_device *dev)
 282 {
 283         return dev->class_data;
 284 }
 285
 286 static inline void
 287 class_set_devdata (struct class_device *dev, void *data)
 288 {
 289         dev->class_data = data;
 290 }
 291
 292
 293 extern int __must_check class_device_register(struct class_device *);
 294 extern void class_device_unregister(struct class_device *);
 295 extern void class_device_initialize(struct class_device *);
 296 extern int __must_check class_device_add(struct class_device *);
 297 extern void class_device_del(struct class_device *);
 298
 299 extern struct class_device * class_device_get(struct class_device *);
 300 extern void class_device_put(struct class_device *);
 301
 302 extern void class_device_remove_file(struct class_device *,
 303                                      const struct class_device_attribute *);
 304 extern int __must_check class_device_create_bin_file(struct class_device *,
 305                                         struct bin_attribute *);
 306 extern void class_device_remove_bin_file(struct class_device *,
 307                                          struct bin_attribute *);
 308
 309 struct class_interface {
 310         struct list_head        node;
 311         struct class            *class;
 312
 313         int (*add)      (struct class_device *, struct class_interface *);
 314         void (*remove)  (struct class_device *, struct class_interface *);
 315         int (*add_dev)          (struct device *, struct class_interface *);
 316         void (*remove_dev)      (struct device *, struct class_interface *);
 317 };
 318
 319 extern int __must_check class_interface_register(struct class_interface *);
 320 extern void class_interface_unregister(struct class_interface *);
 321
 322 extern struct class *class_create(struct module *owner, const char *name);
 323 extern void class_destroy(struct class *cls);
 324 extern struct class_device *class_device_create(struct class *cls,
 325                                                 struct class_device *parent,
 326                                                 dev_t devt,
 327                                                 struct device *device,
 328                                                 const char *fmt, ...)
 329                                         __attribute__((format(printf,5,6)));
 330 extern void class_device_destroy(struct class *cls, dev_t devt);
 331
 332 /*
 333  * The type of device, "struct device" is embedded in. A class
 334  * or bus can contain devices of different types
 335  * like "partitions" and "disks", "mouse" and "event".
 336  * This identifies the device type and carries type-specific
 337  * information, equivalent to the kobj_type of a kobject.
 338  * If "name" is specified, the uevent will contain it in
 339  * the DEVTYPE variable.
 340  */
 341 struct device_type {
 342         const char *name;
 343         struct attribute_group **groups;
 344         int (*uevent)(struct device *dev, char **envp, int num_envp,
 345                       char *buffer, int buffer_size);
 346         void (*release)(struct device *dev);
 347         int (*suspend)(struct device * dev, pm_message_t state);
 348         int (*resume)(struct device * dev);
 349 };
 350
 351 /* interface for exporting device attributes */
 352 struct device_attribute {
 353         struct attribute        attr;
 354         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 355                         char *buf);
 356         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 357                          const char *buf, size_t count);
 358 };
 359
 360 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 361 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 362
 363 extern int __must_check device_create_file(struct device *device,
 364                                         struct device_attribute * entry);
 365 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 366 extern int __must_check device_create_bin_file(struct device *dev,
 367                                                struct bin_attribute *attr);
 368 extern void device_remove_bin_file(struct device *dev,
 369                                    struct bin_attribute *attr);
 370 extern int device_schedule_callback_owner(struct device *dev,
 371                 void (*func)(struct device *), struct module *owner);
 372
 373 /* This is a macro to avoid include problems with THIS_MODULE */
 374 #define device_schedule_callback(dev, func)                     \
 375         device_schedule_callback_owner(dev, func, THIS_MODULE)
 376
 377 /* device resource management */
 378 typedef void (*dr_release_t)(struct device *dev, void *res);
 379 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 380
 381 #ifdef CONFIG_DEBUG_DEVRES
 382 extern void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 383                              const char *name);
 384 #define devres_alloc(release, size, gfp) \
 385         __devres_alloc(release, size, gfp, #release)
 386 #else
 387 extern void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 388 #endif
 389 extern void devres_free(void *res);
 390 extern void devres_add(struct device *dev, void *res);
 391 extern void * devres_find(struct device *dev, dr_release_t release,
 392                           dr_match_t match, void *match_data);
 393 extern void * devres_get(struct device *dev, void *new_res,
 394                          dr_match_t match, void *match_data);
 395 extern void * devres_remove(struct device *dev, dr_release_t release,
 396                             dr_match_t match, void *match_data);
 397 extern int devres_destroy(struct device *dev, dr_release_t release,
 398                           dr_match_t match, void *match_data);
 399
 400 /* devres group */
 401 extern void * __must_check devres_open_group(struct device *dev, void *id,
 402                                              gfp_t gfp);
 403 extern void devres_close_group(struct device *dev, void *id);
 404 extern void devres_remove_group(struct device *dev, void *id);
 405 extern int devres_release_group(struct device *dev, void *id);
 406
 407 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 408 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 409 extern void devm_kfree(struct device *dev, void *p);
 410
 411 struct device {
 412         struct klist            klist_children;
 413         struct klist_node       knode_parent;           /* node in sibling list */
 414         struct klist_node       knode_driver;
 415         struct klist_node       knode_bus;
 416         struct device   * parent;
 417
 418         struct kobject kobj;
 419         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 420         struct device_type      *type;
 421         unsigned                is_registered:1;
 422         struct device_attribute uevent_attr;
 423         struct device_attribute *devt_attr;
 424
 425         struct semaphore        sem;    /* semaphore to synchronize calls to
 426                                          * its driver.
 427                                          */
 428
 429         struct bus_type * bus;          /* type of bus device is on */
 430         struct device_driver *driver;   /* which driver has allocated this
 431                                            device */
 432         void            *driver_data;   /* data private to the driver */
 433         void            *platform_data; /* Platform specific data, device
 434                                            core doesn't touch it */
 435         struct dev_pm_info      power;
 436
 437 #ifdef CONFIG_NUMA
 438         int             numa_node;      /* NUMA node this device is close to */
 439 #endif
 440         u64             *dma_mask;      /* dma mask (if dma'able device) */
 441         u64             coherent_dma_mask;/* Like dma_mask, but for
 442                                              alloc_coherent mappings as
 443                                              not all hardware supports
 444                                              64 bit addresses for consistent
 445                                              allocations such descriptors. */
 446
 447         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 448
 449         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 450                                              override */
 451         /* arch specific additions */
 452         struct dev_archdata     archdata;
 453
 454         spinlock_t              devres_lock;
 455         struct list_head        devres_head;
 456
 457         /* class_device migration path */
 458         struct list_head        node;
 459         struct class            *class;
 460         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 461         struct attribute_group  **groups;       /* optional groups */
 462         int                     uevent_suppress;
 463
 464         void    (*release)(struct device * dev);
 465 };
 466
 467 #ifdef CONFIG_NUMA
 468 static inline int dev_to_node(struct device *dev)
 469 {
 470         return dev->numa_node;
 471 }
 472 static inline void set_dev_node(struct device *dev, int node)
 473 {
 474         dev->numa_node = node;
 475 }
 476 #else
 477 static inline int dev_to_node(struct device *dev)
 478 {
 479         return -1;
 480 }
 481 static inline void set_dev_node(struct device *dev, int node)
 482 {
 483 }
 484 #endif
 485
 486 static inline void *
 487 dev_get_drvdata (struct device *dev)
 488 {
 489         return dev->driver_data;
 490 }
 491
 492 static inline void
 493 dev_set_drvdata (struct device *dev, void *data)
 494 {
 495         dev->driver_data = data;
 496 }
 497
 498 static inline int device_is_registered(struct device *dev)
 499 {
 500         return dev->is_registered;
 501 }
 502
 503 void driver_init(void);
 504
 505 /*
 506  * High level routines for use by the bus drivers
 507  */
 508 extern int __must_check device_register(struct device * dev);
 509 extern void device_unregister(struct device * dev);
 510 extern void device_initialize(struct device * dev);
 511 extern int __must_check device_add(struct device * dev);
 512 extern void device_del(struct device * dev);
 513 extern int device_for_each_child(struct device *, void *,
 514                      int (*fn)(struct device *, void *));
 515 extern struct device *device_find_child(struct device *, void *data,
 516                                         int (*match)(struct device *, void *));
 517 extern int device_rename(struct device *dev, char *new_name);
 518 extern int device_move(struct device *dev, struct device *new_parent);
 519
 520 /*
 521  * Manual binding of a device to driver. See drivers/base/bus.c
 522  * for information on use.
 523  */
 524 extern int __must_check device_bind_driver(struct device *dev);
 525 extern void device_release_driver(struct device * dev);
 526 extern int  __must_check device_attach(struct device * dev);
 527 extern int __must_check driver_attach(struct device_driver *drv);
 528 extern int __must_check device_reprobe(struct device *dev);
 529
 530 /*
 531  * Easy functions for dynamically creating devices on the fly
 532  */
 533 extern struct device *device_create(struct class *cls, struct device *parent,
 534                                     dev_t devt, const char *fmt, ...)
 535                                     __attribute__((format(printf,4,5)));
 536 extern void device_destroy(struct class *cls, dev_t devt);
 537
 538 /*
 539  * Platform "fixup" functions - allow the platform to have their say
 540  * about devices and actions that the general device layer doesn't
 541  * know about.
 542  */
 543 /* Notify platform of device discovery */
 544 extern int (*platform_notify)(struct device * dev);
 545
 546 extern int (*platform_notify_remove)(struct device * dev);
 547
 548
 549 /**
 550  * get_device - atomically increment the reference count for the device.
 551  *
 552  */
 553 extern struct device * get_device(struct device * dev);
 554 extern void put_device(struct device * dev);
 555
 556
 557 /* drivers/base/power/shutdown.c */
 558 extern void device_shutdown(void);
 559
 560
 561 /* drivers/base/firmware.c */
 562 extern int __must_check firmware_register(struct subsystem *);
 563 extern void firmware_unregister(struct subsystem *);
 564
 565 /* debugging and troubleshooting/diagnostic helpers. */
 566 extern const char *dev_driver_string(struct device *dev);
 567 #define dev_printk(level, dev, format, arg...)  \
 568         printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
 569
 570 #ifdef DEBUG
 571 #define dev_dbg(dev, format, arg...)            \
 572         dev_printk(KERN_DEBUG , dev , format , ## arg)
 573 #else
 574 static inline int __attribute__ ((format (printf, 2, 3)))
 575 dev_dbg(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_ */