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 <linux/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 bus_type;
  39 struct bus_type_private;
  40
  41 struct bus_attribute {
  42         struct attribute        attr;
  43         ssize_t (*show)(struct bus_type *bus, char *buf);
  44         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  45 };
  46
  47 #define BUS_ATTR(_name, _mode, _show, _store)   \
  48 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  49
  50 extern int __must_check bus_create_file(struct bus_type *,
  51                                         struct bus_attribute *);
  52 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  53
  54 struct bus_type {
  55         const char              *name;
  56         struct bus_attribute    *bus_attrs;
  57         struct device_attribute *dev_attrs;
  58         struct driver_attribute *drv_attrs;
  59
  60         int (*match)(struct device *dev, struct device_driver *drv);
  61         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  62         int (*probe)(struct device *dev);
  63         int (*remove)(struct device *dev);
  64         void (*shutdown)(struct device *dev);
  65
  66         int (*suspend)(struct device *dev, pm_message_t state);
  67         int (*suspend_late)(struct device *dev, pm_message_t state);
  68         int (*resume_early)(struct device *dev);
  69         int (*resume)(struct device *dev);
  70
  71         struct bus_type_private *p;
  72 };
  73
  74 extern int __must_check bus_register(struct bus_type *bus);
  75 extern void bus_unregister(struct bus_type *bus);
  76
  77 extern int __must_check bus_rescan_devices(struct bus_type *bus);
  78
  79 /* iterator helpers for buses */
  80
  81 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
  82                      int (*fn)(struct device *dev, void *data));
  83 struct device *bus_find_device(struct bus_type *bus, struct device *start,
  84                                void *data,
  85                                int (*match)(struct device *dev, void *data));
  86 struct device *bus_find_device_by_name(struct bus_type *bus,
  87                                        struct device *start,
  88                                        const char *name);
  89
  90 int __must_check bus_for_each_drv(struct bus_type *bus,
  91                                   struct device_driver *start, void *data,
  92                                   int (*fn)(struct device_driver *, void *));
  93
  94 /*
  95  * Bus notifiers: Get notified of addition/removal of devices
  96  * and binding/unbinding of drivers to devices.
  97  * In the long run, it should be a replacement for the platform
  98  * notify hooks.
  99  */
 100 struct notifier_block;
 101
 102 extern int bus_register_notifier(struct bus_type *bus,
 103                                  struct notifier_block *nb);
 104 extern int bus_unregister_notifier(struct bus_type *bus,
 105                                    struct notifier_block *nb);
 106
 107 /* All 4 notifers below get called with the target struct device *
 108  * as an argument. Note that those functions are likely to be called
 109  * with the device semaphore held in the core, so be careful.
 110  */
 111 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 112 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 113 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 114 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 115                                                       unbound */
 116
 117 extern struct kset *bus_get_kset(struct bus_type *bus);
 118 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 119
 120 struct device_driver {
 121         const char              *name;
 122         struct bus_type         *bus;
 123
 124         struct module           *owner;
 125         const char              *mod_name;      /* used for built-in modules */
 126
 127         int (*probe) (struct device *dev);
 128         int (*remove) (struct device *dev);
 129         void (*shutdown) (struct device *dev);
 130         int (*suspend) (struct device *dev, pm_message_t state);
 131         int (*resume) (struct device *dev);
 132         struct attribute_group **groups;
 133
 134         struct driver_private *p;
 135 };
 136
 137
 138 extern int __must_check driver_register(struct device_driver *drv);
 139 extern void driver_unregister(struct device_driver *drv);
 140
 141 extern struct device_driver *get_driver(struct device_driver *drv);
 142 extern void put_driver(struct device_driver *drv);
 143 extern struct device_driver *driver_find(const char *name,
 144                                          struct bus_type *bus);
 145 extern int driver_probe_done(void);
 146
 147 /* sysfs interface for exporting driver attributes */
 148
 149 struct driver_attribute {
 150         struct attribute attr;
 151         ssize_t (*show)(struct device_driver *driver, char *buf);
 152         ssize_t (*store)(struct device_driver *driver, const char *buf,
 153                          size_t count);
 154 };
 155
 156 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 157 struct driver_attribute driver_attr_##_name =           \
 158         __ATTR(_name, _mode, _show, _store)
 159
 160 extern int __must_check driver_create_file(struct device_driver *driver,
 161                                            struct driver_attribute *attr);
 162 extern void driver_remove_file(struct device_driver *driver,
 163                                struct driver_attribute *attr);
 164
 165 extern int __must_check driver_add_kobj(struct device_driver *drv,
 166                                         struct kobject *kobj,
 167                                         const char *fmt, ...);
 168
 169 extern int __must_check driver_for_each_device(struct device_driver *drv,
 170                                                struct device *start,
 171                                                void *data,
 172                                                int (*fn)(struct device *dev,
 173                                                          void *));
 174 struct device *driver_find_device(struct device_driver *drv,
 175                                   struct device *start, void *data,
 176                                   int (*match)(struct device *dev, void *data));
 177
 178 /*
 179  * device classes
 180  */
 181 struct class {
 182         const char              *name;
 183         struct module           *owner;
 184
 185         struct kset             subsys;
 186         struct list_head        devices;
 187         struct list_head        interfaces;
 188         struct kset             class_dirs;
 189         struct semaphore        sem; /* locks children, devices, interfaces */
 190         struct class_attribute          *class_attrs;
 191         struct device_attribute         *dev_attrs;
 192
 193         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 194
 195         void (*class_release)(struct class *class);
 196         void (*dev_release)(struct device *dev);
 197
 198         int (*suspend)(struct device *dev, pm_message_t state);
 199         int (*resume)(struct device *dev);
 200 };
 201
 202 extern int __must_check class_register(struct class *class);
 203 extern void class_unregister(struct class *class);
 204 extern int class_for_each_device(struct class *class, void *data,
 205                                  int (*fn)(struct device *dev, void *data));
 206 extern struct device *class_find_device(struct class *class, void *data,
 207                                         int (*match)(struct device *, void *));
 208
 209 struct class_attribute {
 210         struct attribute attr;
 211         ssize_t (*show)(struct class *class, char *buf);
 212         ssize_t (*store)(struct class *class, const char *buf, size_t count);
 213 };
 214
 215 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 216 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 217
 218 extern int __must_check class_create_file(struct class *class,
 219                                           const struct class_attribute *attr);
 220 extern void class_remove_file(struct class *class,
 221                               const struct class_attribute *attr);
 222
 223 struct class_interface {
 224         struct list_head        node;
 225         struct class            *class;
 226
 227         int (*add_dev)          (struct device *, struct class_interface *);
 228         void (*remove_dev)      (struct device *, struct class_interface *);
 229 };
 230
 231 extern int __must_check class_interface_register(struct class_interface *);
 232 extern void class_interface_unregister(struct class_interface *);
 233
 234 extern struct class *class_create(struct module *owner, const char *name);
 235 extern void class_destroy(struct class *cls);
 236
 237 /*
 238  * The type of device, "struct device" is embedded in. A class
 239  * or bus can contain devices of different types
 240  * like "partitions" and "disks", "mouse" and "event".
 241  * This identifies the device type and carries type-specific
 242  * information, equivalent to the kobj_type of a kobject.
 243  * If "name" is specified, the uevent will contain it in
 244  * the DEVTYPE variable.
 245  */
 246 struct device_type {
 247         const char *name;
 248         struct attribute_group **groups;
 249         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 250         void (*release)(struct device *dev);
 251         int (*suspend)(struct device *dev, pm_message_t state);
 252         int (*resume)(struct device *dev);
 253 };
 254
 255 /* interface for exporting device attributes */
 256 struct device_attribute {
 257         struct attribute        attr;
 258         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 259                         char *buf);
 260         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 261                          const char *buf, size_t count);
 262 };
 263
 264 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 265 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 266
 267 extern int __must_check device_create_file(struct device *device,
 268                                            struct device_attribute *entry);
 269 extern void device_remove_file(struct device *dev,
 270                                struct device_attribute *attr);
 271 extern int __must_check device_create_bin_file(struct device *dev,
 272                                                struct bin_attribute *attr);
 273 extern void device_remove_bin_file(struct device *dev,
 274                                    struct bin_attribute *attr);
 275 extern int device_schedule_callback_owner(struct device *dev,
 276                 void (*func)(struct device *dev), struct module *owner);
 277
 278 /* This is a macro to avoid include problems with THIS_MODULE */
 279 #define device_schedule_callback(dev, func)                     \
 280         device_schedule_callback_owner(dev, func, THIS_MODULE)
 281
 282 /* device resource management */
 283 typedef void (*dr_release_t)(struct device *dev, void *res);
 284 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 285
 286 #ifdef CONFIG_DEBUG_DEVRES
 287 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 288                              const char *name);
 289 #define devres_alloc(release, size, gfp) \
 290         __devres_alloc(release, size, gfp, #release)
 291 #else
 292 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 293 #endif
 294 extern void devres_free(void *res);
 295 extern void devres_add(struct device *dev, void *res);
 296 extern void *devres_find(struct device *dev, dr_release_t release,
 297                          dr_match_t match, void *match_data);
 298 extern void *devres_get(struct device *dev, void *new_res,
 299                         dr_match_t match, void *match_data);
 300 extern void *devres_remove(struct device *dev, dr_release_t release,
 301                            dr_match_t match, void *match_data);
 302 extern int devres_destroy(struct device *dev, dr_release_t release,
 303                           dr_match_t match, void *match_data);
 304
 305 /* devres group */
 306 extern void * __must_check devres_open_group(struct device *dev, void *id,
 307                                              gfp_t gfp);
 308 extern void devres_close_group(struct device *dev, void *id);
 309 extern void devres_remove_group(struct device *dev, void *id);
 310 extern int devres_release_group(struct device *dev, void *id);
 311
 312 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 313 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 314 extern void devm_kfree(struct device *dev, void *p);
 315
 316 struct device_dma_parameters {
 317         /*
 318          * a low level driver may set these to teach IOMMU code about
 319          * sg limitations.
 320          */
 321         unsigned int max_segment_size;
 322         unsigned long segment_boundary_mask;
 323 };
 324
 325 struct device {
 326         struct klist            klist_children;
 327         struct klist_node       knode_parent;   /* node in sibling list */
 328         struct klist_node       knode_driver;
 329         struct klist_node       knode_bus;
 330         struct device           *parent;
 331
 332         struct kobject kobj;
 333         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 334         struct device_type      *type;
 335         unsigned                uevent_suppress:1;
 336
 337         struct semaphore        sem;    /* semaphore to synchronize calls to
 338                                          * its driver.
 339                                          */
 340
 341         struct bus_type *bus;           /* type of bus device is on */
 342         struct device_driver *driver;   /* which driver has allocated this
 343                                            device */
 344         void            *driver_data;   /* data private to the driver */
 345         void            *platform_data; /* Platform specific data, device
 346                                            core doesn't touch it */
 347         struct dev_pm_info      power;
 348
 349 #ifdef CONFIG_NUMA
 350         int             numa_node;      /* NUMA node this device is close to */
 351 #endif
 352         u64             *dma_mask;      /* dma mask (if dma'able device) */
 353         u64             coherent_dma_mask;/* Like dma_mask, but for
 354                                              alloc_coherent mappings as
 355                                              not all hardware supports
 356                                              64 bit addresses for consistent
 357                                              allocations such descriptors. */
 358
 359         struct device_dma_parameters *dma_parms;
 360
 361         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 362
 363         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 364                                              override */
 365         /* arch specific additions */
 366         struct dev_archdata     archdata;
 367
 368         spinlock_t              devres_lock;
 369         struct list_head        devres_head;
 370
 371         struct list_head        node;
 372         struct class            *class;
 373         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 374         struct attribute_group  **groups;       /* optional groups */
 375
 376         void    (*release)(struct device *dev);
 377 };
 378
 379 /* Get the wakeup routines, which depend on struct device */
 380 #include <linux/pm_wakeup.h>
 381
 382 static inline const char *dev_name(struct device *dev)
 383 {
 384         /* will be changed into kobject_name(&dev->kobj) in the near future */
 385         return dev->bus_id;
 386 }
 387
 388 #ifdef CONFIG_NUMA
 389 static inline int dev_to_node(struct device *dev)
 390 {
 391         return dev->numa_node;
 392 }
 393 static inline void set_dev_node(struct device *dev, int node)
 394 {
 395         dev->numa_node = node;
 396 }
 397 #else
 398 static inline int dev_to_node(struct device *dev)
 399 {
 400         return -1;
 401 }
 402 static inline void set_dev_node(struct device *dev, int node)
 403 {
 404 }
 405 #endif
 406
 407 static inline void *dev_get_drvdata(struct device *dev)
 408 {
 409         return dev->driver_data;
 410 }
 411
 412 static inline void dev_set_drvdata(struct device *dev, void *data)
 413 {
 414         dev->driver_data = data;
 415 }
 416
 417 static inline int device_is_registered(struct device *dev)
 418 {
 419         return dev->kobj.state_in_sysfs;
 420 }
 421
 422 void driver_init(void);
 423
 424 /*
 425  * High level routines for use by the bus drivers
 426  */
 427 extern int __must_check device_register(struct device *dev);
 428 extern void device_unregister(struct device *dev);
 429 extern void device_initialize(struct device *dev);
 430 extern int __must_check device_add(struct device *dev);
 431 extern void device_del(struct device *dev);
 432 extern int device_for_each_child(struct device *dev, void *data,
 433                      int (*fn)(struct device *dev, void *data));
 434 extern struct device *device_find_child(struct device *dev, void *data,
 435                                 int (*match)(struct device *dev, void *data));
 436 extern int device_rename(struct device *dev, char *new_name);
 437 extern int device_move(struct device *dev, struct device *new_parent);
 438
 439 /*
 440  * Manual binding of a device to driver. See drivers/base/bus.c
 441  * for information on use.
 442  */
 443 extern int __must_check device_bind_driver(struct device *dev);
 444 extern void device_release_driver(struct device *dev);
 445 extern int  __must_check device_attach(struct device *dev);
 446 extern int __must_check driver_attach(struct device_driver *drv);
 447 extern int __must_check device_reprobe(struct device *dev);
 448
 449 /*
 450  * Easy functions for dynamically creating devices on the fly
 451  */
 452 extern struct device *device_create_vargs(struct class *cls,
 453                                           struct device *parent,
 454                                           dev_t devt,
 455                                           void *drvdata,
 456                                           const char *fmt,
 457                                           va_list vargs);
 458 extern struct device *device_create(struct class *cls, struct device *parent,
 459                                     dev_t devt, const char *fmt, ...)
 460                                     __attribute__((format(printf, 4, 5)));
 461 extern struct device *device_create_drvdata(struct class *cls,
 462                                             struct device *parent,
 463                                             dev_t devt,
 464                                             void *drvdata,
 465                                             const char *fmt, ...)
 466                                     __attribute__((format(printf, 5, 6)));
 467 extern void device_destroy(struct class *cls, dev_t devt);
 468
 469 /*
 470  * Platform "fixup" functions - allow the platform to have their say
 471  * about devices and actions that the general device layer doesn't
 472  * know about.
 473  */
 474 /* Notify platform of device discovery */
 475 extern int (*platform_notify)(struct device *dev);
 476
 477 extern int (*platform_notify_remove)(struct device *dev);
 478
 479
 480 /**
 481  * get_device - atomically increment the reference count for the device.
 482  *
 483  */
 484 extern struct device *get_device(struct device *dev);
 485 extern void put_device(struct device *dev);
 486
 487
 488 /* drivers/base/power/shutdown.c */
 489 extern void device_shutdown(void);
 490
 491 /* drivers/base/sys.c */
 492 extern void sysdev_shutdown(void);
 493
 494 /* debugging and troubleshooting/diagnostic helpers. */
 495 extern const char *dev_driver_string(struct device *dev);
 496 #define dev_printk(level, dev, format, arg...)  \
 497         printk(level "%s %s: " format , dev_driver_string(dev) , \
 498                dev_name(dev) , ## arg)
 499
 500 #define dev_emerg(dev, format, arg...)          \
 501         dev_printk(KERN_EMERG , dev , format , ## arg)
 502 #define dev_alert(dev, format, arg...)          \
 503         dev_printk(KERN_ALERT , dev , format , ## arg)
 504 #define dev_crit(dev, format, arg...)           \
 505         dev_printk(KERN_CRIT , dev , format , ## arg)
 506 #define dev_err(dev, format, arg...)            \
 507         dev_printk(KERN_ERR , dev , format , ## arg)
 508 #define dev_warn(dev, format, arg...)           \
 509         dev_printk(KERN_WARNING , dev , format , ## arg)
 510 #define dev_notice(dev, format, arg...)         \
 511         dev_printk(KERN_NOTICE , dev , format , ## arg)
 512 #define dev_info(dev, format, arg...)           \
 513         dev_printk(KERN_INFO , dev , format , ## arg)
 514
 515 #ifdef DEBUG
 516 #define dev_dbg(dev, format, arg...)            \
 517         dev_printk(KERN_DEBUG , dev , format , ## arg)
 518 #else
 519 #define dev_dbg(dev, format, arg...)            \
 520         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 521 #endif
 522
 523 #ifdef VERBOSE_DEBUG
 524 #define dev_vdbg        dev_dbg
 525 #else
 526
 527 #define dev_vdbg(dev, format, arg...)           \
 528         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 529 #endif
 530
 531 /* Create alias, so I can be autoloaded. */
 532 #define MODULE_ALIAS_CHARDEV(major,minor) \
 533         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 534 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 535         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 536 #endif /* _DEVICE_H_ */