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 /* iterator helpers for buses */
  64
  65 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  66                      int (*fn)(struct device *, void *));
  67 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  68                                 void *data, int (*match)(struct device *, void *));
  69
  70 int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
  71                      void * data, int (*fn)(struct device_driver *, void *));
  72
  73
  74 /* driverfs interface for exporting bus attributes */
  75
  76 struct bus_attribute {
  77         struct attribute        attr;
  78         ssize_t (*show)(struct bus_type *, char * buf);
  79         ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
  80 };
  81
  82 #define BUS_ATTR(_name,_mode,_show,_store)      \
  83 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
  84
  85 extern int bus_create_file(struct bus_type *, struct bus_attribute *);
  86 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  87
  88 struct device_driver {
  89         const char              * name;
  90         struct bus_type         * bus;
  91
  92         struct completion       unloaded;
  93         struct kobject          kobj;
  94         struct klist            klist_devices;
  95         struct klist_node       knode_bus;
  96
  97         struct module           * owner;
  98
  99         int     (*probe)        (struct device * dev);
 100         int     (*remove)       (struct device * dev);
 101         void    (*shutdown)     (struct device * dev);
 102         int     (*suspend)      (struct device * dev, pm_message_t state);
 103         int     (*resume)       (struct device * dev);
 104 };
 105
 106
 107 extern int driver_register(struct device_driver * drv);
 108 extern void driver_unregister(struct device_driver * drv);
 109
 110 extern struct device_driver * get_driver(struct device_driver * drv);
 111 extern void put_driver(struct device_driver * drv);
 112 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 113
 114
 115 /* driverfs interface for exporting driver attributes */
 116
 117 struct driver_attribute {
 118         struct attribute        attr;
 119         ssize_t (*show)(struct device_driver *, char * buf);
 120         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 121 };
 122
 123 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 124 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 125
 126 extern int driver_create_file(struct device_driver *, struct driver_attribute *);
 127 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 128
 129 extern int driver_for_each_device(struct device_driver * drv, struct device * start,
 130                                   void * data, int (*fn)(struct device *, void *));
 131 struct device * driver_find_device(struct device_driver *drv,
 132                                    struct device *start, void *data,
 133                                    int (*match)(struct device *, void *));
 134
 135
 136 /*
 137  * device classes
 138  */
 139 struct class {
 140         const char              * name;
 141         struct module           * owner;
 142
 143         struct subsystem        subsys;
 144         struct list_head        children;
 145         struct list_head        devices;
 146         struct list_head        interfaces;
 147         struct semaphore        sem;    /* locks both the children and interfaces lists */
 148
 149         struct class_attribute          * class_attrs;
 150         struct class_device_attribute   * class_dev_attrs;
 151
 152         int     (*uevent)(struct class_device *dev, char **envp,
 153                            int num_envp, char *buffer, int buffer_size);
 154
 155         void    (*release)(struct class_device *dev);
 156         void    (*class_release)(struct class *class);
 157 };
 158
 159 extern int class_register(struct class *);
 160 extern void class_unregister(struct class *);
 161
 162
 163 struct class_attribute {
 164         struct attribute        attr;
 165         ssize_t (*show)(struct class *, char * buf);
 166         ssize_t (*store)(struct class *, const char * buf, size_t count);
 167 };
 168
 169 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 170 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 171
 172 extern int class_create_file(struct class *, const struct class_attribute *);
 173 extern void class_remove_file(struct class *, const struct class_attribute *);
 174
 175 struct class_device_attribute {
 176         struct attribute        attr;
 177         ssize_t (*show)(struct class_device *, char * buf);
 178         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 179 };
 180
 181 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 182 struct class_device_attribute class_device_attr_##_name =       \
 183         __ATTR(_name,_mode,_show,_store)
 184
 185 extern int class_device_create_file(struct class_device *,
 186                                     const struct class_device_attribute *);
 187
 188 /**
 189  * struct class_device - class devices
 190  * @class: pointer to the parent class for this class device.  This is required.
 191  * @devt: for internal use by the driver core only.
 192  * @node: for internal use by the driver core only.
 193  * @kobj: for internal use by the driver core only.
 194  * @devt_attr: for internal use by the driver core only.
 195  * @groups: optional additional groups to be created
 196  * @dev: if set, a symlink to the struct device is created in the sysfs
 197  * directory for this struct class device.
 198  * @class_data: pointer to whatever you want to store here for this struct
 199  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 200  * set this pointer.
 201  * @parent: pointer to a struct class_device that is the parent of this struct
 202  * class_device.  If NULL, this class_device will show up at the root of the
 203  * struct class in sysfs (which is probably what you want to have happen.)
 204  * @release: pointer to a release function for this struct class_device.  If
 205  * set, this will be called instead of the class specific release function.
 206  * Only use this if you want to override the default release function, like
 207  * when you are nesting class_device structures.
 208  * @uevent: pointer to a uevent function for this struct class_device.  If
 209  * set, this will be called instead of the class specific uevent function.
 210  * Only use this if you want to override the default uevent function, like
 211  * when you are nesting class_device structures.
 212  */
 213 struct class_device {
 214         struct list_head        node;
 215
 216         struct kobject          kobj;
 217         struct class            * class;        /* required */
 218         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 219         struct class_device_attribute *devt_attr;
 220         struct class_device_attribute uevent_attr;
 221         struct device           * dev;          /* not necessary, but nice to have */
 222         void                    * class_data;   /* class-specific data */
 223         struct class_device     *parent;        /* parent of this child device, if there is one */
 224         struct attribute_group  ** groups;      /* optional groups */
 225
 226         void    (*release)(struct class_device *dev);
 227         int     (*uevent)(struct class_device *dev, char **envp,
 228                            int num_envp, char *buffer, int buffer_size);
 229         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 230 };
 231
 232 static inline void *
 233 class_get_devdata (struct class_device *dev)
 234 {
 235         return dev->class_data;
 236 }
 237
 238 static inline void
 239 class_set_devdata (struct class_device *dev, void *data)
 240 {
 241         dev->class_data = data;
 242 }
 243
 244
 245 extern int class_device_register(struct class_device *);
 246 extern void class_device_unregister(struct class_device *);
 247 extern void class_device_initialize(struct class_device *);
 248 extern int class_device_add(struct class_device *);
 249 extern void class_device_del(struct class_device *);
 250
 251 extern int class_device_rename(struct class_device *, char *);
 252
 253 extern struct class_device * class_device_get(struct class_device *);
 254 extern void class_device_put(struct class_device *);
 255
 256 extern void class_device_remove_file(struct class_device *,
 257                                      const struct class_device_attribute *);
 258 extern int class_device_create_bin_file(struct class_device *,
 259                                         struct bin_attribute *);
 260 extern void class_device_remove_bin_file(struct class_device *,
 261                                          struct bin_attribute *);
 262
 263 struct class_interface {
 264         struct list_head        node;
 265         struct class            *class;
 266
 267         int (*add)      (struct class_device *, struct class_interface *);
 268         void (*remove)  (struct class_device *, struct class_interface *);
 269 };
 270
 271 extern int class_interface_register(struct class_interface *);
 272 extern void class_interface_unregister(struct class_interface *);
 273
 274 extern struct class *class_create(struct module *owner, char *name);
 275 extern void class_destroy(struct class *cls);
 276 extern struct class_device *class_device_create(struct class *cls,
 277                                                 struct class_device *parent,
 278                                                 dev_t devt,
 279                                                 struct device *device,
 280                                                 char *fmt, ...)
 281                                         __attribute__((format(printf,5,6)));
 282 extern void class_device_destroy(struct class *cls, dev_t devt);
 283
 284
 285 /* interface for exporting device attributes */
 286 struct device_attribute {
 287         struct attribute        attr;
 288         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 289                         char *buf);
 290         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 291                          const char *buf, size_t count);
 292 };
 293
 294 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 295 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 296
 297 extern int device_create_file(struct device *device, struct device_attribute * entry);
 298 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 299 struct device {
 300         struct klist            klist_children;
 301         struct klist_node       knode_parent;           /* node in sibling list */
 302         struct klist_node       knode_driver;
 303         struct klist_node       knode_bus;
 304         struct device   * parent;
 305
 306         struct kobject kobj;
 307         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 308         struct device_attribute uevent_attr;
 309         struct device_attribute *devt_attr;
 310
 311         struct semaphore        sem;    /* semaphore to synchronize calls to
 312                                          * its driver.
 313                                          */
 314
 315         struct bus_type * bus;          /* type of bus device is on */
 316         struct device_driver *driver;   /* which driver has allocated this
 317                                            device */
 318         void            *driver_data;   /* data private to the driver */
 319         void            *platform_data; /* Platform specific data, device
 320                                            core doesn't touch it */
 321         void            *firmware_data; /* Firmware specific data (e.g. ACPI,
 322                                            BIOS data),reserved for device core*/
 323         struct dev_pm_info      power;
 324
 325         u64             *dma_mask;      /* dma mask (if dma'able device) */
 326         u64             coherent_dma_mask;/* Like dma_mask, but for
 327                                              alloc_coherent mappings as
 328                                              not all hardware supports
 329                                              64 bit addresses for consistent
 330                                              allocations such descriptors. */
 331
 332         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 333
 334         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 335                                              override */
 336
 337         /* class_device migration path */
 338         struct list_head        node;
 339         struct class            *class;         /* optional*/
 340         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 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  * Easy functions for dynamically creating devices on the fly
 385  */
 386 extern struct device *device_create(struct class *cls, struct device *parent,
 387                                     dev_t devt, char *fmt, ...)
 388                                     __attribute__((format(printf,4,5)));
 389 extern void device_destroy(struct class *cls, dev_t devt);
 390
 391 /*
 392  * Platform "fixup" functions - allow the platform to have their say
 393  * about devices and actions that the general device layer doesn't
 394  * know about.
 395  */
 396 /* Notify platform of device discovery */
 397 extern int (*platform_notify)(struct device * dev);
 398
 399 extern int (*platform_notify_remove)(struct device * dev);
 400
 401
 402 /**
 403  * get_device - atomically increment the reference count for the device.
 404  *
 405  */
 406 extern struct device * get_device(struct device * dev);
 407 extern void put_device(struct device * dev);
 408
 409
 410 /* drivers/base/power/shutdown.c */
 411 extern void device_shutdown(void);
 412
 413
 414 /* drivers/base/firmware.c */
 415 extern int firmware_register(struct subsystem *);
 416 extern void firmware_unregister(struct subsystem *);
 417
 418 /* debugging and troubleshooting/diagnostic helpers. */
 419 extern const char *dev_driver_string(struct device *dev);
 420 #define dev_printk(level, dev, format, arg...)  \
 421         printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
 422
 423 #ifdef DEBUG
 424 #define dev_dbg(dev, format, arg...)            \
 425         dev_printk(KERN_DEBUG , dev , format , ## arg)
 426 #else
 427 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
 428 #endif
 429
 430 #define dev_err(dev, format, arg...)            \
 431         dev_printk(KERN_ERR , dev , format , ## arg)
 432 #define dev_info(dev, format, arg...)           \
 433         dev_printk(KERN_INFO , dev , format , ## arg)
 434 #define dev_warn(dev, format, arg...)           \
 435         dev_printk(KERN_WARNING , dev , format , ## arg)
 436 #define dev_notice(dev, format, arg...)         \
 437         dev_printk(KERN_NOTICE , dev , format , ## arg)
 438
 439 /* Create alias, so I can be autoloaded. */
 440 #define MODULE_ALIAS_CHARDEV(major,minor) \
 441         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 442 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 443         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 444 #endif /* _DEVICE_H_ */