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 class_private;
  39 struct bus_type;
  40 struct bus_type_private;
  41
  42 struct bus_attribute {
  43         struct attribute        attr;
  44         ssize_t (*show)(struct bus_type *bus, char *buf);
  45         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  46 };
  47
  48 #define BUS_ATTR(_name, _mode, _show, _store)   \
  49 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
  50
  51 extern int __must_check bus_create_file(struct bus_type *,
  52                                         struct bus_attribute *);
  53 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  54
  55 struct bus_type {
  56         const char              *name;
  57         struct bus_attribute    *bus_attrs;
  58         struct device_attribute *dev_attrs;
  59         struct driver_attribute *drv_attrs;
  60
  61         int (*match)(struct device *dev, struct device_driver *drv);
  62         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
  63         int (*probe)(struct device *dev);
  64         int (*remove)(struct device *dev);
  65         void (*shutdown)(struct device *dev);
  66
  67         int (*suspend)(struct device *dev, pm_message_t state);
  68         int (*suspend_late)(struct device *dev, pm_message_t state);
  69         int (*resume_early)(struct device *dev);
  70         int (*resume)(struct device *dev);
  71
  72         struct pm_ext_ops *pm;
  73
  74         struct bus_type_private *p;
  75 };
  76
  77 extern int __must_check bus_register(struct bus_type *bus);
  78 extern void bus_unregister(struct bus_type *bus);
  79
  80 extern int __must_check bus_rescan_devices(struct bus_type *bus);
  81
  82 /* iterator helpers for buses */
  83
  84 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
  85                      int (*fn)(struct device *dev, void *data));
  86 struct device *bus_find_device(struct bus_type *bus, struct device *start,
  87                                void *data,
  88                                int (*match)(struct device *dev, void *data));
  89 struct device *bus_find_device_by_name(struct bus_type *bus,
  90                                        struct device *start,
  91                                        const char *name);
  92
  93 int __must_check bus_for_each_drv(struct bus_type *bus,
  94                                   struct device_driver *start, void *data,
  95                                   int (*fn)(struct device_driver *, void *));
  96
  97 /*
  98  * Bus notifiers: Get notified of addition/removal of devices
  99  * and binding/unbinding of drivers to devices.
 100  * In the long run, it should be a replacement for the platform
 101  * notify hooks.
 102  */
 103 struct notifier_block;
 104
 105 extern int bus_register_notifier(struct bus_type *bus,
 106                                  struct notifier_block *nb);
 107 extern int bus_unregister_notifier(struct bus_type *bus,
 108                                    struct notifier_block *nb);
 109
 110 /* All 4 notifers below get called with the target struct device *
 111  * as an argument. Note that those functions are likely to be called
 112  * with the device semaphore held in the core, so be careful.
 113  */
 114 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 115 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
 116 #define BUS_NOTIFY_BOUND_DRIVER         0x00000003 /* driver bound to device */
 117 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000004 /* driver about to be
 118                                                       unbound */
 119
 120 extern struct kset *bus_get_kset(struct bus_type *bus);
 121 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 122
 123 struct device_driver {
 124         const char              *name;
 125         struct bus_type         *bus;
 126
 127         struct module           *owner;
 128         const char              *mod_name;      /* used for built-in modules */
 129
 130         int (*probe) (struct device *dev);
 131         int (*remove) (struct device *dev);
 132         void (*shutdown) (struct device *dev);
 133         int (*suspend) (struct device *dev, pm_message_t state);
 134         int (*resume) (struct device *dev);
 135         struct attribute_group **groups;
 136
 137         struct pm_ops *pm;
 138
 139         struct driver_private *p;
 140 };
 141
 142
 143 extern int __must_check driver_register(struct device_driver *drv);
 144 extern void driver_unregister(struct device_driver *drv);
 145
 146 extern struct device_driver *get_driver(struct device_driver *drv);
 147 extern void put_driver(struct device_driver *drv);
 148 extern struct device_driver *driver_find(const char *name,
 149                                          struct bus_type *bus);
 150 extern int driver_probe_done(void);
 151
 152 /* sysfs interface for exporting driver attributes */
 153
 154 struct driver_attribute {
 155         struct attribute attr;
 156         ssize_t (*show)(struct device_driver *driver, char *buf);
 157         ssize_t (*store)(struct device_driver *driver, const char *buf,
 158                          size_t count);
 159 };
 160
 161 #define DRIVER_ATTR(_name, _mode, _show, _store)        \
 162 struct driver_attribute driver_attr_##_name =           \
 163         __ATTR(_name, _mode, _show, _store)
 164
 165 extern int __must_check driver_create_file(struct device_driver *driver,
 166                                            struct driver_attribute *attr);
 167 extern void driver_remove_file(struct device_driver *driver,
 168                                struct driver_attribute *attr);
 169
 170 extern int __must_check driver_add_kobj(struct device_driver *drv,
 171                                         struct kobject *kobj,
 172                                         const char *fmt, ...);
 173
 174 extern int __must_check driver_for_each_device(struct device_driver *drv,
 175                                                struct device *start,
 176                                                void *data,
 177                                                int (*fn)(struct device *dev,
 178                                                          void *));
 179 struct device *driver_find_device(struct device_driver *drv,
 180                                   struct device *start, void *data,
 181                                   int (*match)(struct device *dev, void *data));
 182
 183 /*
 184  * device classes
 185  */
 186 struct class {
 187         const char              *name;
 188         struct module           *owner;
 189
 190         struct class_attribute          *class_attrs;
 191         struct device_attribute         *dev_attrs;
 192         struct kobject                  *dev_kobj;
 193
 194         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 195
 196         void (*class_release)(struct class *class);
 197         void (*dev_release)(struct device *dev);
 198
 199         int (*suspend)(struct device *dev, pm_message_t state);
 200         int (*resume)(struct device *dev);
 201
 202         struct pm_ops *pm;
 203         struct class_private *p;
 204 };
 205
 206 extern struct kobject *sysfs_dev_block_kobj;
 207 extern struct kobject *sysfs_dev_char_kobj;
 208 extern int __must_check class_register(struct class *class);
 209 extern void class_unregister(struct class *class);
 210 extern int class_for_each_device(struct class *class, struct device *start,
 211                                  void *data,
 212                                  int (*fn)(struct device *dev, void *data));
 213 extern struct device *class_find_device(struct class *class,
 214                                         struct device *start, void *data,
 215                                         int (*match)(struct device *, void *));
 216
 217 struct class_attribute {
 218         struct attribute attr;
 219         ssize_t (*show)(struct class *class, char *buf);
 220         ssize_t (*store)(struct class *class, const char *buf, size_t count);
 221 };
 222
 223 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 224 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 225
 226 extern int __must_check class_create_file(struct class *class,
 227                                           const struct class_attribute *attr);
 228 extern void class_remove_file(struct class *class,
 229                               const struct class_attribute *attr);
 230
 231 struct class_interface {
 232         struct list_head        node;
 233         struct class            *class;
 234
 235         int (*add_dev)          (struct device *, struct class_interface *);
 236         void (*remove_dev)      (struct device *, struct class_interface *);
 237 };
 238
 239 extern int __must_check class_interface_register(struct class_interface *);
 240 extern void class_interface_unregister(struct class_interface *);
 241
 242 extern struct class *class_create(struct module *owner, const char *name);
 243 extern void class_destroy(struct class *cls);
 244
 245 /*
 246  * The type of device, "struct device" is embedded in. A class
 247  * or bus can contain devices of different types
 248  * like "partitions" and "disks", "mouse" and "event".
 249  * This identifies the device type and carries type-specific
 250  * information, equivalent to the kobj_type of a kobject.
 251  * If "name" is specified, the uevent will contain it in
 252  * the DEVTYPE variable.
 253  */
 254 struct device_type {
 255         const char *name;
 256         struct attribute_group **groups;
 257         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 258         void (*release)(struct device *dev);
 259
 260         int (*suspend)(struct device *dev, pm_message_t state);
 261         int (*resume)(struct device *dev);
 262
 263         struct pm_ops *pm;
 264 };
 265
 266 /* interface for exporting device attributes */
 267 struct device_attribute {
 268         struct attribute        attr;
 269         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 270                         char *buf);
 271         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 272                          const char *buf, size_t count);
 273 };
 274
 275 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 276 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 277
 278 extern int __must_check device_create_file(struct device *device,
 279                                            struct device_attribute *entry);
 280 extern void device_remove_file(struct device *dev,
 281                                struct device_attribute *attr);
 282 extern int __must_check device_create_bin_file(struct device *dev,
 283                                                struct bin_attribute *attr);
 284 extern void device_remove_bin_file(struct device *dev,
 285                                    struct bin_attribute *attr);
 286 extern int device_schedule_callback_owner(struct device *dev,
 287                 void (*func)(struct device *dev), struct module *owner);
 288
 289 /* This is a macro to avoid include problems with THIS_MODULE */
 290 #define device_schedule_callback(dev, func)                     \
 291         device_schedule_callback_owner(dev, func, THIS_MODULE)
 292
 293 /* device resource management */
 294 typedef void (*dr_release_t)(struct device *dev, void *res);
 295 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 296
 297 #ifdef CONFIG_DEBUG_DEVRES
 298 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 299                              const char *name);
 300 #define devres_alloc(release, size, gfp) \
 301         __devres_alloc(release, size, gfp, #release)
 302 #else
 303 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 304 #endif
 305 extern void devres_free(void *res);
 306 extern void devres_add(struct device *dev, void *res);
 307 extern void *devres_find(struct device *dev, dr_release_t release,
 308                          dr_match_t match, void *match_data);
 309 extern void *devres_get(struct device *dev, void *new_res,
 310                         dr_match_t match, void *match_data);
 311 extern void *devres_remove(struct device *dev, dr_release_t release,
 312                            dr_match_t match, void *match_data);
 313 extern int devres_destroy(struct device *dev, dr_release_t release,
 314                           dr_match_t match, void *match_data);
 315
 316 /* devres group */
 317 extern void * __must_check devres_open_group(struct device *dev, void *id,
 318                                              gfp_t gfp);
 319 extern void devres_close_group(struct device *dev, void *id);
 320 extern void devres_remove_group(struct device *dev, void *id);
 321 extern int devres_release_group(struct device *dev, void *id);
 322
 323 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 324 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 325 extern void devm_kfree(struct device *dev, void *p);
 326
 327 struct device_dma_parameters {
 328         /*
 329          * a low level driver may set these to teach IOMMU code about
 330          * sg limitations.
 331          */
 332         unsigned int max_segment_size;
 333         unsigned long segment_boundary_mask;
 334 };
 335
 336 struct device {
 337         struct klist            klist_children;
 338         struct klist_node       knode_parent;   /* node in sibling list */
 339         struct klist_node       knode_driver;
 340         struct klist_node       knode_bus;
 341         struct device           *parent;
 342
 343         struct kobject kobj;
 344         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 345         struct device_type      *type;
 346         unsigned                uevent_suppress:1;
 347
 348         struct semaphore        sem;    /* semaphore to synchronize calls to
 349                                          * its driver.
 350                                          */
 351
 352         struct bus_type *bus;           /* type of bus device is on */
 353         struct device_driver *driver;   /* which driver has allocated this
 354                                            device */
 355         void            *driver_data;   /* data private to the driver */
 356         void            *platform_data; /* Platform specific data, device
 357                                            core doesn't touch it */
 358         struct dev_pm_info      power;
 359
 360 #ifdef CONFIG_NUMA
 361         int             numa_node;      /* NUMA node this device is close to */
 362 #endif
 363         u64             *dma_mask;      /* dma mask (if dma'able device) */
 364         u64             coherent_dma_mask;/* Like dma_mask, but for
 365                                              alloc_coherent mappings as
 366                                              not all hardware supports
 367                                              64 bit addresses for consistent
 368                                              allocations such descriptors. */
 369
 370         struct device_dma_parameters *dma_parms;
 371
 372         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 373
 374         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 375                                              override */
 376         /* arch specific additions */
 377         struct dev_archdata     archdata;
 378
 379         spinlock_t              devres_lock;
 380         struct list_head        devres_head;
 381
 382         struct list_head        node;
 383         struct class            *class;
 384         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 385         struct attribute_group  **groups;       /* optional groups */
 386
 387         void    (*release)(struct device *dev);
 388 };
 389
 390 /* Get the wakeup routines, which depend on struct device */
 391 #include <linux/pm_wakeup.h>
 392
 393 static inline const char *dev_name(struct device *dev)
 394 {
 395         /* will be changed into kobject_name(&dev->kobj) in the near future */
 396         return dev->bus_id;
 397 }
 398
 399 extern int dev_set_name(struct device *dev, const char *name, ...)
 400                         __attribute__((format(printf, 2, 3)));
 401
 402 #ifdef CONFIG_NUMA
 403 static inline int dev_to_node(struct device *dev)
 404 {
 405         return dev->numa_node;
 406 }
 407 static inline void set_dev_node(struct device *dev, int node)
 408 {
 409         dev->numa_node = node;
 410 }
 411 #else
 412 static inline int dev_to_node(struct device *dev)
 413 {
 414         return -1;
 415 }
 416 static inline void set_dev_node(struct device *dev, int node)
 417 {
 418 }
 419 #endif
 420
 421 static inline void *dev_get_drvdata(struct device *dev)
 422 {
 423         return dev->driver_data;
 424 }
 425
 426 static inline void dev_set_drvdata(struct device *dev, void *data)
 427 {
 428         dev->driver_data = data;
 429 }
 430
 431 static inline int device_is_registered(struct device *dev)
 432 {
 433         return dev->kobj.state_in_sysfs;
 434 }
 435
 436 void driver_init(void);
 437
 438 /*
 439  * High level routines for use by the bus drivers
 440  */
 441 extern int __must_check device_register(struct device *dev);
 442 extern void device_unregister(struct device *dev);
 443 extern void device_initialize(struct device *dev);
 444 extern int __must_check device_add(struct device *dev);
 445 extern void device_del(struct device *dev);
 446 extern int device_for_each_child(struct device *dev, void *data,
 447                      int (*fn)(struct device *dev, void *data));
 448 extern struct device *device_find_child(struct device *dev, void *data,
 449                                 int (*match)(struct device *dev, void *data));
 450 extern int device_rename(struct device *dev, char *new_name);
 451 extern int device_move(struct device *dev, struct device *new_parent);
 452
 453 /*
 454  * Manual binding of a device to driver. See drivers/base/bus.c
 455  * for information on use.
 456  */
 457 extern int __must_check device_bind_driver(struct device *dev);
 458 extern void device_release_driver(struct device *dev);
 459 extern int  __must_check device_attach(struct device *dev);
 460 extern int __must_check driver_attach(struct device_driver *drv);
 461 extern int __must_check device_reprobe(struct device *dev);
 462
 463 /*
 464  * Easy functions for dynamically creating devices on the fly
 465  */
 466 extern struct device *device_create_vargs(struct class *cls,
 467                                           struct device *parent,
 468                                           dev_t devt,
 469                                           void *drvdata,
 470                                           const char *fmt,
 471                                           va_list vargs);
 472 extern struct device *device_create(struct class *cls, struct device *parent,
 473                                     dev_t devt, void *drvdata,
 474                                     const char *fmt, ...)
 475                                     __attribute__((format(printf, 5, 6)));
 476 #define device_create_drvdata   device_create
 477 extern void device_destroy(struct class *cls, dev_t devt);
 478
 479 /*
 480  * Platform "fixup" functions - allow the platform to have their say
 481  * about devices and actions that the general device layer doesn't
 482  * know about.
 483  */
 484 /* Notify platform of device discovery */
 485 extern int (*platform_notify)(struct device *dev);
 486
 487 extern int (*platform_notify_remove)(struct device *dev);
 488
 489
 490 /**
 491  * get_device - atomically increment the reference count for the device.
 492  *
 493  */
 494 extern struct device *get_device(struct device *dev);
 495 extern void put_device(struct device *dev);
 496
 497
 498 /* drivers/base/power/shutdown.c */
 499 extern void device_shutdown(void);
 500
 501 /* drivers/base/sys.c */
 502 extern void sysdev_shutdown(void);
 503
 504 /* debugging and troubleshooting/diagnostic helpers. */
 505 extern const char *dev_driver_string(struct device *dev);
 506 #define dev_printk(level, dev, format, arg...)  \
 507         printk(level "%s %s: " format , dev_driver_string(dev) , \
 508                dev_name(dev) , ## arg)
 509
 510 #define dev_emerg(dev, format, arg...)          \
 511         dev_printk(KERN_EMERG , dev , format , ## arg)
 512 #define dev_alert(dev, format, arg...)          \
 513         dev_printk(KERN_ALERT , dev , format , ## arg)
 514 #define dev_crit(dev, format, arg...)           \
 515         dev_printk(KERN_CRIT , dev , format , ## arg)
 516 #define dev_err(dev, format, arg...)            \
 517         dev_printk(KERN_ERR , dev , format , ## arg)
 518 #define dev_warn(dev, format, arg...)           \
 519         dev_printk(KERN_WARNING , dev , format , ## arg)
 520 #define dev_notice(dev, format, arg...)         \
 521         dev_printk(KERN_NOTICE , dev , format , ## arg)
 522 #define dev_info(dev, format, arg...)           \
 523         dev_printk(KERN_INFO , dev , format , ## arg)
 524
 525 #ifdef DEBUG
 526 #define dev_dbg(dev, format, arg...)            \
 527         dev_printk(KERN_DEBUG , dev , format , ## arg)
 528 #else
 529 #define dev_dbg(dev, format, arg...)            \
 530         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 531 #endif
 532
 533 #ifdef VERBOSE_DEBUG
 534 #define dev_vdbg        dev_dbg
 535 #else
 536
 537 #define dev_vdbg(dev, format, arg...)           \
 538         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 539 #endif
 540
 541 /* Create alias, so I can be autoloaded. */
 542 #define MODULE_ALIAS_CHARDEV(major,minor) \
 543         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 544 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 545         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 546 #endif /* _DEVICE_H_ */