include/linux/device.h

   1 /*
   2  * device.h - generic, centralized driver model
   3  *
   4  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
   5  *
   6  * This file is released under the GPLv2
   7  *
   8  * See Documentation/driver-model/ for more information.
   9  */
  10
  11 #ifndef _DEVICE_H_
  12 #define _DEVICE_H_
  13
  14 #include <linux/ioport.h>
  15 #include <linux/kobject.h>
  16 #include <linux/klist.h>
  17 #include <linux/list.h>
  18 #include <linux/types.h>
  19 #include <linux/module.h>
  20 #include <linux/pm.h>
  21 #include <asm/semaphore.h>
  22 #include <asm/atomic.h>
  23
  24 #define DEVICE_NAME_SIZE        50
  25 #define DEVICE_NAME_HALF        __stringify(20) /* Less than half to accommodate slop */
  26 #define DEVICE_ID_SIZE          32
  27 #define BUS_ID_SIZE             KOBJ_NAME_LEN
  28
  29
  30 struct device;
  31 struct device_driver;
  32 struct class;
  33 struct class_device;
  34
  35 struct bus_type {
  36         const char              * name;
  37
  38         struct subsystem        subsys;
  39         struct kset             drivers;
  40         struct kset             devices;
  41         struct klist            klist_devices;
  42         struct klist            klist_drivers;
  43
  44         struct bus_attribute    * bus_attrs;
  45         struct device_attribute * dev_attrs;
  46         struct driver_attribute * drv_attrs;
  47
  48         int             (*match)(struct device * dev, struct device_driver * drv);
  49         int             (*uevent)(struct device *dev, char **envp,
  50                                   int num_envp, char *buffer, int buffer_size);
  51         int             (*probe)(struct device * dev);
  52         int             (*remove)(struct device * dev);
  53         void            (*shutdown)(struct device * dev);
  54         int             (*suspend)(struct device * dev, pm_message_t state);
  55         int             (*resume)(struct device * dev);
  56 };
  57
  58 extern int bus_register(struct bus_type * bus);
  59 extern void bus_unregister(struct bus_type * bus);
  60
  61 extern void bus_rescan_devices(struct bus_type * bus);
  62
  63 extern struct bus_type * get_bus(struct bus_type * bus);
  64 extern void put_bus(struct bus_type * bus);
  65
  66 extern struct bus_type * find_bus(char * name);
  67
  68 /* iterator helpers for buses */
  69
  70 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  71                      int (*fn)(struct device *, void *));
  72 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  73                                 void *data, int (*match)(struct device *, void *));
  74
  75 int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
  76                      void * data, int (*fn)(struct device_driver *, void *));
  77
  78
  79 /* driverfs interface for exporting bus attributes */
  80
  81 struct bus_attribute {
  82         struct attribute        attr;
  83         ssize_t (*show)(struct bus_type *, char * buf);
  84         ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
  85 };
  86
  87 #define BUS_ATTR(_name,_mode,_show,_store)      \
  88 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
  89
  90 extern int bus_create_file(struct bus_type *, struct bus_attribute *);
  91 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  92
  93 struct device_driver {
  94         const char              * name;
  95         struct bus_type         * bus;
  96
  97         struct completion       unloaded;
  98         struct kobject          kobj;
  99         struct klist            klist_devices;
 100         struct klist_node       knode_bus;
 101
 102         struct module           * owner;
 103
 104         int     (*probe)        (struct device * dev);
 105         int     (*remove)       (struct device * dev);
 106         void    (*shutdown)     (struct device * dev);
 107         int     (*suspend)      (struct device * dev, pm_message_t state);
 108         int     (*resume)       (struct device * dev);
 109 };
 110
 111
 112 extern int driver_register(struct device_driver * drv);
 113 extern void driver_unregister(struct device_driver * drv);
 114
 115 extern struct device_driver * get_driver(struct device_driver * drv);
 116 extern void put_driver(struct device_driver * drv);
 117 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 118
 119
 120 /* driverfs interface for exporting driver attributes */
 121
 122 struct driver_attribute {
 123         struct attribute        attr;
 124         ssize_t (*show)(struct device_driver *, char * buf);
 125         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 126 };
 127
 128 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 129 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 130
 131 extern int driver_create_file(struct device_driver *, struct driver_attribute *);
 132 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 133
 134 extern int driver_for_each_device(struct device_driver * drv, struct device * start,
 135                                   void * data, int (*fn)(struct device *, void *));
 136 struct device * driver_find_device(struct device_driver *drv,
 137                                    struct device *start, void *data,
 138                                    int (*match)(struct device *, void *));
 139
 140
 141 /*
 142  * device classes
 143  */
 144 struct class {
 145         const char              * name;
 146         struct module           * owner;
 147
 148         struct subsystem        subsys;
 149         struct list_head        children;
 150         struct list_head        interfaces;
 151         struct semaphore        sem;    /* locks both the children and interfaces lists */
 152
 153         struct class_attribute          * class_attrs;
 154         struct class_device_attribute   * class_dev_attrs;
 155
 156         int     (*uevent)(struct class_device *dev, char **envp,
 157                            int num_envp, char *buffer, int buffer_size);
 158
 159         void    (*release)(struct class_device *dev);
 160         void    (*class_release)(struct class *class);
 161 };
 162
 163 extern int class_register(struct class *);
 164 extern void class_unregister(struct class *);
 165
 166 extern struct class * class_get(struct class *);
 167 extern void class_put(struct class *);
 168
 169
 170 struct class_attribute {
 171         struct attribute        attr;
 172         ssize_t (*show)(struct class *, char * buf);
 173         ssize_t (*store)(struct class *, const char * buf, size_t count);
 174 };
 175
 176 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 177 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 178
 179 extern int class_create_file(struct class *, const struct class_attribute *);
 180 extern void class_remove_file(struct class *, const struct class_attribute *);
 181
 182 struct class_device_attribute {
 183         struct attribute        attr;
 184         ssize_t (*show)(struct class_device *, char * buf);
 185         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 186 };
 187
 188 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 189 struct class_device_attribute class_device_attr_##_name =       \
 190         __ATTR(_name,_mode,_show,_store)
 191
 192 extern int class_device_create_file(struct class_device *,
 193                                     const struct class_device_attribute *);
 194
 195 /**
 196  * struct class_device - class devices
 197  * @class: pointer to the parent class for this class device.  This is required.
 198  * @devt: for internal use by the driver core only.
 199  * @node: for internal use by the driver core only.
 200  * @kobj: for internal use by the driver core only.
 201  * @devt_attr: for internal use by the driver core only.
 202  * @dev: if set, a symlink to the struct device is created in the sysfs
 203  * directory for this struct class device.
 204  * @class_data: pointer to whatever you want to store here for this struct
 205  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 206  * set this pointer.
 207  * @parent: pointer to a struct class_device that is the parent of this struct
 208  * class_device.  If NULL, this class_device will show up at the root of the
 209  * struct class in sysfs (which is probably what you want to have happen.)
 210  * @release: pointer to a release function for this struct class_device.  If
 211  * set, this will be called instead of the class specific release function.
 212  * Only use this if you want to override the default release function, like
 213  * when you are nesting class_device structures.
 214  * @uevent: pointer to a uevent function for this struct class_device.  If
 215  * set, this will be called instead of the class specific uevent function.
 216  * Only use this if you want to override the default uevent function, like
 217  * when you are nesting class_device structures.
 218  */
 219 struct class_device {
 220         struct list_head        node;
 221
 222         struct kobject          kobj;
 223         struct class            * class;        /* required */
 224         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 225         struct class_device_attribute *devt_attr;
 226         struct class_device_attribute uevent_attr;
 227         struct device           * dev;          /* not necessary, but nice to have */
 228         void                    * class_data;   /* class-specific data */
 229         struct class_device     *parent;        /* parent of this child device, if there is one */
 230
 231         void    (*release)(struct class_device *dev);
 232         int     (*uevent)(struct class_device *dev, char **envp,
 233                            int num_envp, char *buffer, int buffer_size);
 234         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 235 };
 236
 237 static inline void *
 238 class_get_devdata (struct class_device *dev)
 239 {
 240         return dev->class_data;
 241 }
 242
 243 static inline void
 244 class_set_devdata (struct class_device *dev, void *data)
 245 {
 246         dev->class_data = data;
 247 }
 248
 249
 250 extern int class_device_register(struct class_device *);
 251 extern void class_device_unregister(struct class_device *);
 252 extern void class_device_initialize(struct class_device *);
 253 extern int class_device_add(struct class_device *);
 254 extern void class_device_del(struct class_device *);
 255
 256 extern int class_device_rename(struct class_device *, char *);
 257
 258 extern struct class_device * class_device_get(struct class_device *);
 259 extern void class_device_put(struct class_device *);
 260
 261 extern void class_device_remove_file(struct class_device *,
 262                                      const struct class_device_attribute *);
 263 extern int class_device_create_bin_file(struct class_device *,
 264                                         struct bin_attribute *);
 265 extern void class_device_remove_bin_file(struct class_device *,
 266                                          struct bin_attribute *);
 267
 268 struct class_interface {
 269         struct list_head        node;
 270         struct class            *class;
 271
 272         int (*add)      (struct class_device *, struct class_interface *);
 273         void (*remove)  (struct class_device *, struct class_interface *);
 274 };
 275
 276 extern int class_interface_register(struct class_interface *);
 277 extern void class_interface_unregister(struct class_interface *);
 278
 279 extern struct class *class_create(struct module *owner, char *name);
 280 extern void class_destroy(struct class *cls);
 281 extern struct class_device *class_device_create(struct class *cls,
 282                                                 struct class_device *parent,
 283                                                 dev_t devt,
 284                                                 struct device *device,
 285                                                 char *fmt, ...)
 286                                         __attribute__((format(printf,5,6)));
 287 extern void class_device_destroy(struct class *cls, dev_t devt);
 288
 289
 290 /* interface for exporting device attributes */
 291 struct device_attribute {
 292         struct attribute        attr;
 293         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 294                         char *buf);
 295         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 296                          const char *buf, size_t count);
 297 };
 298
 299 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 300 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 301
 302 extern int device_create_file(struct device *device, struct device_attribute * entry);
 303 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 304 struct device {
 305         struct klist            klist_children;
 306         struct klist_node       knode_parent;           /* node in sibling list */
 307         struct klist_node       knode_driver;
 308         struct klist_node       knode_bus;
 309         struct device   * parent;
 310
 311         struct kobject kobj;
 312         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 313         struct device_attribute uevent_attr;
 314
 315         struct semaphore        sem;    /* semaphore to synchronize calls to
 316                                          * its driver.
 317                                          */
 318
 319         struct bus_type * bus;          /* type of bus device is on */
 320         struct device_driver *driver;   /* which driver has allocated this
 321                                            device */
 322         void            *driver_data;   /* data private to the driver */
 323         void            *platform_data; /* Platform specific data, device
 324                                            core doesn't touch it */
 325         void            *firmware_data; /* Firmware specific data (e.g. ACPI,
 326                                            BIOS data),reserved for device core*/
 327         struct dev_pm_info      power;
 328
 329         u64             *dma_mask;      /* dma mask (if dma'able device) */
 330         u64             coherent_dma_mask;/* Like dma_mask, but for
 331                                              alloc_coherent mappings as
 332                                              not all hardware supports
 333                                              64 bit addresses for consistent
 334                                              allocations such descriptors. */
 335
 336         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 337
 338         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 339                                              override */
 340
 341         void    (*release)(struct device * dev);
 342 };
 343
 344 static inline void *
 345 dev_get_drvdata (struct device *dev)
 346 {
 347         return dev->driver_data;
 348 }
 349
 350 static inline void
 351 dev_set_drvdata (struct device *dev, void *data)
 352 {
 353         dev->driver_data = data;
 354 }
 355
 356 static inline int device_is_registered(struct device *dev)
 357 {
 358         return klist_node_attached(&dev->knode_bus);
 359 }
 360
 361 /*
 362  * High level routines for use by the bus drivers
 363  */
 364 extern int device_register(struct device * dev);
 365 extern void device_unregister(struct device * dev);
 366 extern void device_initialize(struct device * dev);
 367 extern int device_add(struct device * dev);
 368 extern void device_del(struct device * dev);
 369 extern int device_for_each_child(struct device *, void *,
 370                      int (*fn)(struct device *, void *));
 371
 372 /*
 373  * Manual binding of a device to driver. See drivers/base/bus.c
 374  * for information on use.
 375  */
 376 extern void device_bind_driver(struct device * dev);
 377 extern void device_release_driver(struct device * dev);
 378 extern int  device_attach(struct device * dev);
 379 extern void driver_attach(struct device_driver * drv);
 380 extern void device_reprobe(struct device *dev);
 381
 382
 383 /*
 384  * Platform "fixup" functions - allow the platform to have their say
 385  * about devices and actions that the general device layer doesn't
 386  * know about.
 387  */
 388 /* Notify platform of device discovery */
 389 extern int (*platform_notify)(struct device * dev);
 390
 391 extern int (*platform_notify_remove)(struct device * dev);
 392
 393
 394 /**
 395  * get_device - atomically increment the reference count for the device.
 396  *
 397  */
 398 extern struct device * get_device(struct device * dev);
 399 extern void put_device(struct device * dev);
 400
 401
 402 /* drivers/base/power/shutdown.c */
 403 extern void device_shutdown(void);
 404
 405
 406 /* drivers/base/firmware.c */
 407 extern int firmware_register(struct subsystem *);
 408 extern void firmware_unregister(struct subsystem *);
 409
 410 /* debugging and troubleshooting/diagnostic helpers. */
 411 #define dev_printk(level, dev, format, arg...)  \
 412         printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg)
 413
 414 #ifdef DEBUG
 415 #define dev_dbg(dev, format, arg...)            \
 416         dev_printk(KERN_DEBUG , dev , format , ## arg)
 417 #else
 418 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
 419 #endif
 420
 421 #define dev_err(dev, format, arg...)            \
 422         dev_printk(KERN_ERR , dev , format , ## arg)
 423 #define dev_info(dev, format, arg...)           \
 424         dev_printk(KERN_INFO , dev , format , ## arg)
 425 #define dev_warn(dev, format, arg...)           \
 426         dev_printk(KERN_WARNING , dev , format , ## arg)
 427 #define dev_notice(dev, format, arg...)         \
 428         dev_printk(KERN_NOTICE , dev , format , ## arg)
 429
 430 /* Create alias, so I can be autoloaded. */
 431 #define MODULE_ALIAS_CHARDEV(major,minor) \
 432         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 433 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 434         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 435 #endif /* _DEVICE_H_ */