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