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