include/linux/device.h

   1 /*
   2  * device.h - generic, centralized driver model
   3  *
   4  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
   5  *
   6  * This file is released under the GPLv2
   7  *
   8  * See Documentation/driver-model/ for more information.
   9  */
  10
  11 #ifndef _DEVICE_H_
  12 #define _DEVICE_H_
  13
  14 #include <linux/ioport.h>
  15 #include <linux/kobject.h>
  16 #include <linux/klist.h>
  17 #include <linux/list.h>
  18 #include <linux/compiler.h>
  19 #include <linux/types.h>
  20 #include <linux/module.h>
  21 #include <linux/pm.h>
  22 #include <asm/semaphore.h>
  23 #include <asm/atomic.h>
  24 #include <asm/device.h>
  25
  26 #define DEVICE_NAME_SIZE        50
  27 #define DEVICE_NAME_HALF        __stringify(20) /* Less than half to accommodate slop */
  28 #define DEVICE_ID_SIZE          32
  29 #define BUS_ID_SIZE             KOBJ_NAME_LEN
  30
  31
  32 struct device;
  33 struct device_driver;
  34 struct class;
  35 struct class_device;
  36
  37 struct bus_type {
  38         const char              * name;
  39
  40         struct subsystem        subsys;
  41         struct kset             drivers;
  42         struct kset             devices;
  43         struct klist            klist_devices;
  44         struct klist            klist_drivers;
  45
  46         struct blocking_notifier_head bus_notifier;
  47
  48         struct bus_attribute    * bus_attrs;
  49         struct device_attribute * dev_attrs;
  50         struct driver_attribute * drv_attrs;
  51
  52         int             (*match)(struct device * dev, struct device_driver * drv);
  53         int             (*uevent)(struct device *dev, char **envp,
  54                                   int num_envp, char *buffer, int buffer_size);
  55         int             (*probe)(struct device * dev);
  56         int             (*remove)(struct device * dev);
  57         void            (*shutdown)(struct device * dev);
  58
  59         int (*suspend)(struct device * dev, pm_message_t state);
  60         int (*suspend_late)(struct device * dev, pm_message_t state);
  61         int (*resume_early)(struct device * dev);
  62         int (*resume)(struct device * dev);
  63 };
  64
  65 extern int __must_check bus_register(struct bus_type * bus);
  66 extern void bus_unregister(struct bus_type * bus);
  67
  68 extern int __must_check bus_rescan_devices(struct bus_type * bus);
  69
  70 /* iterator helpers for buses */
  71
  72 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  73                      int (*fn)(struct device *, void *));
  74 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  75                                 void *data, int (*match)(struct device *, void *));
  76
  77 int __must_check bus_for_each_drv(struct bus_type *bus,
  78                 struct device_driver *start, void *data,
  79                 int (*fn)(struct device_driver *, void *));
  80
  81 /*
  82  * Bus notifiers: Get notified of addition/removal of devices
  83  * and binding/unbinding of drivers to devices.
  84  * In the long run, it should be a replacement for the platform
  85  * notify hooks.
  86  */
  87 struct notifier_block;
  88
  89 extern int bus_register_notifier(struct bus_type *bus,
  90                                  struct notifier_block *nb);
  91 extern int bus_unregister_notifier(struct bus_type *bus,
  92                                    struct notifier_block *nb);
  93
  94 /* All 4 notifers below get called with the target struct device *
  95  * as an argument. Note that those functions are likely to be called
  96  * with the device semaphore held in the core, so be careful.
  97  */
  98 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
  99 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 100 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 101 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 102                                                       unbound */
 103
 104 /* driverfs interface for exporting bus attributes */
 105
 106 struct bus_attribute {
 107         struct attribute        attr;
 108         ssize_t (*show)(struct bus_type *, char * buf);
 109         ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
 110 };
 111
 112 #define BUS_ATTR(_name,_mode,_show,_store)      \
 113 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
 114
 115 extern int __must_check bus_create_file(struct bus_type *,
 116                                         struct bus_attribute *);
 117 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
 118
 119 struct device_driver {
 120         const char              * name;
 121         struct bus_type         * bus;
 122
 123         struct completion       unloaded;
 124         struct kobject          kobj;
 125         struct klist            klist_devices;
 126         struct klist_node       knode_bus;
 127
 128         struct module           * owner;
 129         const char              * mod_name;     /* used for built-in modules */
 130
 131         int     (*probe)        (struct device * dev);
 132         int     (*remove)       (struct device * dev);
 133         void    (*shutdown)     (struct device * dev);
 134         int     (*suspend)      (struct device * dev, pm_message_t state);
 135         int     (*resume)       (struct device * dev);
 136
 137         unsigned int multithread_probe:1;
 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 /* driverfs 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 subsystem        subsys;
 179         struct list_head        children;
 180         struct list_head        devices;
 181         struct list_head        interfaces;
 182         struct semaphore        sem;    /* locks both the children and interfaces lists */
 183
 184         struct kobject          *virtual_dir;
 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, char **envp,
 191                            int num_envp, char *buffer, int buffer_size);
 192         int     (*dev_uevent)(struct device *dev, char **envp, int num_envp,
 193                                 char *buffer, int buffer_size);
 194
 195         void    (*release)(struct class_device *dev);
 196         void    (*class_release)(struct class *class);
 197         void    (*dev_release)(struct device *dev);
 198
 199         int     (*suspend)(struct device *, pm_message_t state);
 200         int     (*resume)(struct device *);
 201 };
 202
 203 extern int __must_check class_register(struct class *);
 204 extern void class_unregister(struct class *);
 205
 206
 207 struct class_attribute {
 208         struct attribute        attr;
 209         ssize_t (*show)(struct class *, char * buf);
 210         ssize_t (*store)(struct class *, const char * buf, size_t count);
 211 };
 212
 213 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 214 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 215
 216 extern int __must_check class_create_file(struct class *,
 217                                         const struct class_attribute *);
 218 extern void class_remove_file(struct class *, const struct class_attribute *);
 219
 220 struct class_device_attribute {
 221         struct attribute        attr;
 222         ssize_t (*show)(struct class_device *, char * buf);
 223         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 224 };
 225
 226 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 227 struct class_device_attribute class_device_attr_##_name =       \
 228         __ATTR(_name,_mode,_show,_store)
 229
 230 extern int __must_check class_device_create_file(struct class_device *,
 231                                     const struct class_device_attribute *);
 232
 233 /**
 234  * struct class_device - class devices
 235  * @class: pointer to the parent class for this class device.  This is required.
 236  * @devt: for internal use by the driver core only.
 237  * @node: for internal use by the driver core only.
 238  * @kobj: for internal use by the driver core only.
 239  * @devt_attr: for internal use by the driver core only.
 240  * @groups: optional additional groups to be created
 241  * @dev: if set, a symlink to the struct device is created in the sysfs
 242  * directory for this struct class device.
 243  * @class_data: pointer to whatever you want to store here for this struct
 244  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 245  * set this pointer.
 246  * @parent: pointer to a struct class_device that is the parent of this struct
 247  * class_device.  If NULL, this class_device will show up at the root of the
 248  * struct class in sysfs (which is probably what you want to have happen.)
 249  * @release: pointer to a release function for this struct class_device.  If
 250  * set, this will be called instead of the class specific release function.
 251  * Only use this if you want to override the default release function, like
 252  * when you are nesting class_device structures.
 253  * @uevent: pointer to a uevent function for this struct class_device.  If
 254  * set, this will be called instead of the class specific uevent function.
 255  * Only use this if you want to override the default uevent function, like
 256  * when you are nesting class_device structures.
 257  */
 258 struct class_device {
 259         struct list_head        node;
 260
 261         struct kobject          kobj;
 262         struct class            * class;        /* required */
 263         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 264         struct class_device_attribute *devt_attr;
 265         struct class_device_attribute uevent_attr;
 266         struct device           * dev;          /* not necessary, but nice to have */
 267         void                    * class_data;   /* class-specific data */
 268         struct class_device     *parent;        /* parent of this child device, if there is one */
 269         struct attribute_group  ** groups;      /* optional groups */
 270
 271         void    (*release)(struct class_device *dev);
 272         int     (*uevent)(struct class_device *dev, char **envp,
 273                            int num_envp, char *buffer, int buffer_size);
 274         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 275 };
 276
 277 static inline void *
 278 class_get_devdata (struct class_device *dev)
 279 {
 280         return dev->class_data;
 281 }
 282
 283 static inline void
 284 class_set_devdata (struct class_device *dev, void *data)
 285 {
 286         dev->class_data = data;
 287 }
 288
 289
 290 extern int __must_check class_device_register(struct class_device *);
 291 extern void class_device_unregister(struct class_device *);
 292 extern void class_device_initialize(struct class_device *);
 293 extern int __must_check class_device_add(struct class_device *);
 294 extern void class_device_del(struct class_device *);
 295
 296 extern int class_device_rename(struct class_device *, char *);
 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 struct device_type {
 332         struct device_attribute *attrs;
 333         int (*uevent)(struct device *dev, char **envp, int num_envp,
 334                       char *buffer, int buffer_size);
 335         void (*release)(struct device *dev);
 336 };
 337
 338 /* interface for exporting device attributes */
 339 struct device_attribute {
 340         struct attribute        attr;
 341         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 342                         char *buf);
 343         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 344                          const char *buf, size_t count);
 345 };
 346
 347 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 348 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 349
 350 extern int __must_check device_create_file(struct device *device,
 351                                         struct device_attribute * entry);
 352 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 353 extern int __must_check device_create_bin_file(struct device *dev,
 354                                                struct bin_attribute *attr);
 355 extern void device_remove_bin_file(struct device *dev,
 356                                    struct bin_attribute *attr);
 357 struct device {
 358         struct klist            klist_children;
 359         struct klist_node       knode_parent;           /* node in sibling list */
 360         struct klist_node       knode_driver;
 361         struct klist_node       knode_bus;
 362         struct device   * parent;
 363
 364         struct kobject kobj;
 365         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 366         struct device_type      *type;
 367         unsigned                is_registered:1;
 368         struct device_attribute uevent_attr;
 369         struct device_attribute *devt_attr;
 370
 371         struct semaphore        sem;    /* semaphore to synchronize calls to
 372                                          * its driver.
 373                                          */
 374
 375         struct bus_type * bus;          /* type of bus device is on */
 376         struct device_driver *driver;   /* which driver has allocated this
 377                                            device */
 378         void            *driver_data;   /* data private to the driver */
 379         void            *platform_data; /* Platform specific data, device
 380                                            core doesn't touch it */
 381         struct dev_pm_info      power;
 382
 383 #ifdef CONFIG_NUMA
 384         int             numa_node;      /* NUMA node this device is close to */
 385 #endif
 386         u64             *dma_mask;      /* dma mask (if dma'able device) */
 387         u64             coherent_dma_mask;/* Like dma_mask, but for
 388                                              alloc_coherent mappings as
 389                                              not all hardware supports
 390                                              64 bit addresses for consistent
 391                                              allocations such descriptors. */
 392
 393         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 394
 395         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 396                                              override */
 397         /* arch specific additions */
 398         struct dev_archdata     archdata;
 399
 400         /* class_device migration path */
 401         struct list_head        node;
 402         struct class            *class;         /* optional*/
 403         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 404         struct attribute_group  **groups;       /* optional groups */
 405
 406         void    (*release)(struct device * dev);
 407 };
 408
 409 #ifdef CONFIG_NUMA
 410 static inline int dev_to_node(struct device *dev)
 411 {
 412         return dev->numa_node;
 413 }
 414 static inline void set_dev_node(struct device *dev, int node)
 415 {
 416         dev->numa_node = node;
 417 }
 418 #else
 419 static inline int dev_to_node(struct device *dev)
 420 {
 421         return -1;
 422 }
 423 static inline void set_dev_node(struct device *dev, int node)
 424 {
 425 }
 426 #endif
 427
 428 static inline void *
 429 dev_get_drvdata (struct device *dev)
 430 {
 431         return dev->driver_data;
 432 }
 433
 434 static inline void
 435 dev_set_drvdata (struct device *dev, void *data)
 436 {
 437         dev->driver_data = data;
 438 }
 439
 440 static inline int device_is_registered(struct device *dev)
 441 {
 442         return dev->is_registered;
 443 }
 444
 445 void driver_init(void);
 446
 447 /*
 448  * High level routines for use by the bus drivers
 449  */
 450 extern int __must_check device_register(struct device * dev);
 451 extern void device_unregister(struct device * dev);
 452 extern void device_initialize(struct device * dev);
 453 extern int __must_check device_add(struct device * dev);
 454 extern void device_del(struct device * dev);
 455 extern int device_for_each_child(struct device *, void *,
 456                      int (*fn)(struct device *, void *));
 457 extern struct device *device_find_child(struct device *, void *data,
 458                                         int (*match)(struct device *, void *));
 459 extern int device_rename(struct device *dev, char *new_name);
 460 extern int device_move(struct device *dev, struct device *new_parent);
 461
 462 /*
 463  * Manual binding of a device to driver. See drivers/base/bus.c
 464  * for information on use.
 465  */
 466 extern int __must_check device_bind_driver(struct device *dev);
 467 extern void device_release_driver(struct device * dev);
 468 extern int  __must_check device_attach(struct device * dev);
 469 extern int __must_check driver_attach(struct device_driver *drv);
 470 extern int __must_check device_reprobe(struct device *dev);
 471
 472 /*
 473  * Easy functions for dynamically creating devices on the fly
 474  */
 475 extern struct device *device_create(struct class *cls, struct device *parent,
 476                                     dev_t devt, const char *fmt, ...)
 477                                     __attribute__((format(printf,4,5)));
 478 extern void device_destroy(struct class *cls, dev_t devt);
 479
 480 /*
 481  * Platform "fixup" functions - allow the platform to have their say
 482  * about devices and actions that the general device layer doesn't
 483  * know about.
 484  */
 485 /* Notify platform of device discovery */
 486 extern int (*platform_notify)(struct device * dev);
 487
 488 extern int (*platform_notify_remove)(struct device * dev);
 489
 490
 491 /**
 492  * get_device - atomically increment the reference count for the device.
 493  *
 494  */
 495 extern struct device * get_device(struct device * dev);
 496 extern void put_device(struct device * dev);
 497
 498
 499 /* drivers/base/power/shutdown.c */
 500 extern void device_shutdown(void);
 501
 502
 503 /* drivers/base/firmware.c */
 504 extern int __must_check firmware_register(struct subsystem *);
 505 extern void firmware_unregister(struct subsystem *);
 506
 507 /* debugging and troubleshooting/diagnostic helpers. */
 508 extern const char *dev_driver_string(struct device *dev);
 509 #define dev_printk(level, dev, format, arg...)  \
 510         printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
 511
 512 #ifdef DEBUG
 513 #define dev_dbg(dev, format, arg...)            \
 514         dev_printk(KERN_DEBUG , dev , format , ## arg)
 515 #else
 516 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
 517 #endif
 518
 519 #define dev_err(dev, format, arg...)            \
 520         dev_printk(KERN_ERR , dev , format , ## arg)
 521 #define dev_info(dev, format, arg...)           \
 522         dev_printk(KERN_INFO , dev , format , ## arg)
 523 #define dev_warn(dev, format, arg...)           \
 524         dev_printk(KERN_WARNING , dev , format , ## arg)
 525 #define dev_notice(dev, format, arg...)         \
 526         dev_printk(KERN_NOTICE , dev , format , ## arg)
 527
 528 /* Create alias, so I can be autoloaded. */
 529 #define MODULE_ALIAS_CHARDEV(major,minor) \
 530         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 531 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 532         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 533 #endif /* _DEVICE_H_ */