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