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        children;
 187         struct list_head        devices;
 188         struct list_head        interfaces;
 189         struct kset             class_dirs;
 190         struct semaphore        sem; /* locks children, devices, interfaces */
 191         struct class_attribute          *class_attrs;
 192         struct device_attribute         *dev_attrs;
 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
 203 extern int __must_check class_register(struct class *class);
 204 extern void class_unregister(struct class *class);
 205 extern int class_for_each_device(struct class *class, void *data,
 206                                  int (*fn)(struct device *dev, void *data));
 207 extern struct device *class_find_device(struct class *class, void *data,
 208                                         int (*match)(struct device *, void *));
 209
 210 struct class_attribute {
 211         struct attribute attr;
 212         ssize_t (*show)(struct class *class, char *buf);
 213         ssize_t (*store)(struct class *class, const char *buf, size_t count);
 214 };
 215
 216 #define CLASS_ATTR(_name, _mode, _show, _store)                 \
 217 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
 218
 219 extern int __must_check class_create_file(struct class *class,
 220                                           const struct class_attribute *attr);
 221 extern void class_remove_file(struct class *class,
 222                               const struct class_attribute *attr);
 223
 224 struct class_interface {
 225         struct list_head        node;
 226         struct class            *class;
 227
 228         int (*add_dev)          (struct device *, struct class_interface *);
 229         void (*remove_dev)      (struct device *, struct class_interface *);
 230 };
 231
 232 extern int __must_check class_interface_register(struct class_interface *);
 233 extern void class_interface_unregister(struct class_interface *);
 234
 235 extern struct class *class_create(struct module *owner, const char *name);
 236 extern void class_destroy(struct class *cls);
 237
 238 /*
 239  * The type of device, "struct device" is embedded in. A class
 240  * or bus can contain devices of different types
 241  * like "partitions" and "disks", "mouse" and "event".
 242  * This identifies the device type and carries type-specific
 243  * information, equivalent to the kobj_type of a kobject.
 244  * If "name" is specified, the uevent will contain it in
 245  * the DEVTYPE variable.
 246  */
 247 struct device_type {
 248         const char *name;
 249         struct attribute_group **groups;
 250         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 251         void (*release)(struct device *dev);
 252         int (*suspend)(struct device *dev, pm_message_t state);
 253         int (*resume)(struct device *dev);
 254 };
 255
 256 /* interface for exporting device attributes */
 257 struct device_attribute {
 258         struct attribute        attr;
 259         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 260                         char *buf);
 261         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 262                          const char *buf, size_t count);
 263 };
 264
 265 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 266 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 267
 268 extern int __must_check device_create_file(struct device *device,
 269                                            struct device_attribute *entry);
 270 extern void device_remove_file(struct device *dev,
 271                                struct device_attribute *attr);
 272 extern int __must_check device_create_bin_file(struct device *dev,
 273                                                struct bin_attribute *attr);
 274 extern void device_remove_bin_file(struct device *dev,
 275                                    struct bin_attribute *attr);
 276 extern int device_schedule_callback_owner(struct device *dev,
 277                 void (*func)(struct device *dev), struct module *owner);
 278
 279 /* This is a macro to avoid include problems with THIS_MODULE */
 280 #define device_schedule_callback(dev, func)                     \
 281         device_schedule_callback_owner(dev, func, THIS_MODULE)
 282
 283 /* device resource management */
 284 typedef void (*dr_release_t)(struct device *dev, void *res);
 285 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 286
 287 #ifdef CONFIG_DEBUG_DEVRES
 288 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
 289                              const char *name);
 290 #define devres_alloc(release, size, gfp) \
 291         __devres_alloc(release, size, gfp, #release)
 292 #else
 293 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
 294 #endif
 295 extern void devres_free(void *res);
 296 extern void devres_add(struct device *dev, void *res);
 297 extern void *devres_find(struct device *dev, dr_release_t release,
 298                          dr_match_t match, void *match_data);
 299 extern void *devres_get(struct device *dev, void *new_res,
 300                         dr_match_t match, void *match_data);
 301 extern void *devres_remove(struct device *dev, dr_release_t release,
 302                            dr_match_t match, void *match_data);
 303 extern int devres_destroy(struct device *dev, dr_release_t release,
 304                           dr_match_t match, void *match_data);
 305
 306 /* devres group */
 307 extern void * __must_check devres_open_group(struct device *dev, void *id,
 308                                              gfp_t gfp);
 309 extern void devres_close_group(struct device *dev, void *id);
 310 extern void devres_remove_group(struct device *dev, void *id);
 311 extern int devres_release_group(struct device *dev, void *id);
 312
 313 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
 314 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
 315 extern void devm_kfree(struct device *dev, void *p);
 316
 317 struct device_dma_parameters {
 318         /*
 319          * a low level driver may set these to teach IOMMU code about
 320          * sg limitations.
 321          */
 322         unsigned int max_segment_size;
 323         unsigned long segment_boundary_mask;
 324 };
 325
 326 struct device {
 327         struct klist            klist_children;
 328         struct klist_node       knode_parent;   /* node in sibling list */
 329         struct klist_node       knode_driver;
 330         struct klist_node       knode_bus;
 331         struct device           *parent;
 332
 333         struct kobject kobj;
 334         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 335         struct device_type      *type;
 336         unsigned                uevent_suppress:1;
 337
 338         struct semaphore        sem;    /* semaphore to synchronize calls to
 339                                          * its driver.
 340                                          */
 341
 342         struct bus_type *bus;           /* type of bus device is on */
 343         struct device_driver *driver;   /* which driver has allocated this
 344                                            device */
 345         void            *driver_data;   /* data private to the driver */
 346         void            *platform_data; /* Platform specific data, device
 347                                            core doesn't touch it */
 348         struct dev_pm_info      power;
 349
 350 #ifdef CONFIG_NUMA
 351         int             numa_node;      /* NUMA node this device is close to */
 352 #endif
 353         u64             *dma_mask;      /* dma mask (if dma'able device) */
 354         u64             coherent_dma_mask;/* Like dma_mask, but for
 355                                              alloc_coherent mappings as
 356                                              not all hardware supports
 357                                              64 bit addresses for consistent
 358                                              allocations such descriptors. */
 359
 360         struct device_dma_parameters *dma_parms;
 361
 362         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 363
 364         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 365                                              override */
 366         /* arch specific additions */
 367         struct dev_archdata     archdata;
 368
 369         spinlock_t              devres_lock;
 370         struct list_head        devres_head;
 371
 372         struct list_head        node;
 373         struct class            *class;
 374         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
 375         struct attribute_group  **groups;       /* optional groups */
 376
 377         void    (*release)(struct device *dev);
 378 };
 379
 380 /* Get the wakeup routines, which depend on struct device */
 381 #include <linux/pm_wakeup.h>
 382
 383 static inline const char *dev_name(struct device *dev)
 384 {
 385         /* will be changed into kobject_name(&dev->kobj) in the near future */
 386         return dev->bus_id;
 387 }
 388
 389 #ifdef CONFIG_NUMA
 390 static inline int dev_to_node(struct device *dev)
 391 {
 392         return dev->numa_node;
 393 }
 394 static inline void set_dev_node(struct device *dev, int node)
 395 {
 396         dev->numa_node = node;
 397 }
 398 #else
 399 static inline int dev_to_node(struct device *dev)
 400 {
 401         return -1;
 402 }
 403 static inline void set_dev_node(struct device *dev, int node)
 404 {
 405 }
 406 #endif
 407
 408 static inline void *dev_get_drvdata(struct device *dev)
 409 {
 410         return dev->driver_data;
 411 }
 412
 413 static inline void dev_set_drvdata(struct device *dev, void *data)
 414 {
 415         dev->driver_data = data;
 416 }
 417
 418 static inline int device_is_registered(struct device *dev)
 419 {
 420         return dev->kobj.state_in_sysfs;
 421 }
 422
 423 void driver_init(void);
 424
 425 /*
 426  * High level routines for use by the bus drivers
 427  */
 428 extern int __must_check device_register(struct device *dev);
 429 extern void device_unregister(struct device *dev);
 430 extern void device_initialize(struct device *dev);
 431 extern int __must_check device_add(struct device *dev);
 432 extern void device_del(struct device *dev);
 433 extern int device_for_each_child(struct device *dev, void *data,
 434                      int (*fn)(struct device *dev, void *data));
 435 extern struct device *device_find_child(struct device *dev, void *data,
 436                                 int (*match)(struct device *dev, void *data));
 437 extern int device_rename(struct device *dev, char *new_name);
 438 extern int device_move(struct device *dev, struct device *new_parent);
 439
 440 /*
 441  * Manual binding of a device to driver. See drivers/base/bus.c
 442  * for information on use.
 443  */
 444 extern int __must_check device_bind_driver(struct device *dev);
 445 extern void device_release_driver(struct device *dev);
 446 extern int  __must_check device_attach(struct device *dev);
 447 extern int __must_check driver_attach(struct device_driver *drv);
 448 extern int __must_check device_reprobe(struct device *dev);
 449
 450 /*
 451  * Easy functions for dynamically creating devices on the fly
 452  */
 453 extern struct device *device_create(struct class *cls, struct device *parent,
 454                                     dev_t devt, const char *fmt, ...)
 455                                     __attribute__((format(printf, 4, 5)));
 456 extern void device_destroy(struct class *cls, dev_t devt);
 457
 458 /*
 459  * Platform "fixup" functions - allow the platform to have their say
 460  * about devices and actions that the general device layer doesn't
 461  * know about.
 462  */
 463 /* Notify platform of device discovery */
 464 extern int (*platform_notify)(struct device *dev);
 465
 466 extern int (*platform_notify_remove)(struct device *dev);
 467
 468
 469 /**
 470  * get_device - atomically increment the reference count for the device.
 471  *
 472  */
 473 extern struct device *get_device(struct device *dev);
 474 extern void put_device(struct device *dev);
 475
 476
 477 /* drivers/base/power/shutdown.c */
 478 extern void device_shutdown(void);
 479
 480 /* drivers/base/sys.c */
 481 extern void sysdev_shutdown(void);
 482
 483 /* debugging and troubleshooting/diagnostic helpers. */
 484 extern const char *dev_driver_string(struct device *dev);
 485 #define dev_printk(level, dev, format, arg...)  \
 486         printk(level "%s %s: " format , dev_driver_string(dev) , \
 487                dev_name(dev) , ## arg)
 488
 489 #define dev_emerg(dev, format, arg...)          \
 490         dev_printk(KERN_EMERG , dev , format , ## arg)
 491 #define dev_alert(dev, format, arg...)          \
 492         dev_printk(KERN_ALERT , dev , format , ## arg)
 493 #define dev_crit(dev, format, arg...)           \
 494         dev_printk(KERN_CRIT , dev , format , ## arg)
 495 #define dev_err(dev, format, arg...)            \
 496         dev_printk(KERN_ERR , dev , format , ## arg)
 497 #define dev_warn(dev, format, arg...)           \
 498         dev_printk(KERN_WARNING , dev , format , ## arg)
 499 #define dev_notice(dev, format, arg...)         \
 500         dev_printk(KERN_NOTICE , dev , format , ## arg)
 501 #define dev_info(dev, format, arg...)           \
 502         dev_printk(KERN_INFO , dev , format , ## arg)
 503
 504 #ifdef DEBUG
 505 #define dev_dbg(dev, format, arg...)            \
 506         dev_printk(KERN_DEBUG , dev , format , ## arg)
 507 #else
 508 #define dev_dbg(dev, format, arg...)            \
 509         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 510 #endif
 511
 512 #ifdef VERBOSE_DEBUG
 513 #define dev_vdbg        dev_dbg
 514 #else
 515
 516 #define dev_vdbg(dev, format, arg...)           \
 517         ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
 518 #endif
 519
 520 /* Create alias, so I can be autoloaded. */
 521 #define MODULE_ALIAS_CHARDEV(major,minor) \
 522         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 523 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 524         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 525 #endif /* _DEVICE_H_ */