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
  55         int (*suspend)(struct device * dev, pm_message_t state);
  56         int (*suspend_late)(struct device * dev, pm_message_t state);
  57         int (*resume_early)(struct device * dev);
  58         int (*resume)(struct device * dev);
  59 };
  60
  61 extern int bus_register(struct bus_type * bus);
  62 extern void bus_unregister(struct bus_type * bus);
  63
  64 extern void bus_rescan_devices(struct bus_type * bus);
  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        devices;
 149         struct list_head        interfaces;
 150         struct semaphore        sem;    /* locks both the children and interfaces lists */
 151
 152         struct class_attribute          * class_attrs;
 153         struct class_device_attribute   * class_dev_attrs;
 154
 155         int     (*uevent)(struct class_device *dev, char **envp,
 156                            int num_envp, char *buffer, int buffer_size);
 157
 158         void    (*release)(struct class_device *dev);
 159         void    (*class_release)(struct class *class);
 160
 161         int     (*suspend)(struct device *, pm_message_t state);
 162         int     (*resume)(struct device *);
 163 };
 164
 165 extern int class_register(struct class *);
 166 extern void class_unregister(struct class *);
 167
 168
 169 struct class_attribute {
 170         struct attribute        attr;
 171         ssize_t (*show)(struct class *, char * buf);
 172         ssize_t (*store)(struct class *, const char * buf, size_t count);
 173 };
 174
 175 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 176 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 177
 178 extern int class_create_file(struct class *, const struct class_attribute *);
 179 extern void class_remove_file(struct class *, const struct class_attribute *);
 180
 181 struct class_device_attribute {
 182         struct attribute        attr;
 183         ssize_t (*show)(struct class_device *, char * buf);
 184         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 185 };
 186
 187 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 188 struct class_device_attribute class_device_attr_##_name =       \
 189         __ATTR(_name,_mode,_show,_store)
 190
 191 extern int class_device_create_file(struct class_device *,
 192                                     const struct class_device_attribute *);
 193
 194 /**
 195  * struct class_device - class devices
 196  * @class: pointer to the parent class for this class device.  This is required.
 197  * @devt: for internal use by the driver core only.
 198  * @node: for internal use by the driver core only.
 199  * @kobj: for internal use by the driver core only.
 200  * @devt_attr: for internal use by the driver core only.
 201  * @groups: optional additional groups to be created
 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         struct attribute_group  ** groups;      /* optional groups */
 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, const 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                                                 const 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         struct device_attribute *devt_attr;
 316
 317         struct semaphore        sem;    /* semaphore to synchronize calls to
 318                                          * its driver.
 319                                          */
 320
 321         struct bus_type * bus;          /* type of bus device is on */
 322         struct device_driver *driver;   /* which driver has allocated this
 323                                            device */
 324         void            *driver_data;   /* data private to the driver */
 325         void            *platform_data; /* Platform specific data, device
 326                                            core doesn't touch it */
 327         void            *firmware_data; /* Firmware specific data (e.g. ACPI,
 328                                            BIOS data),reserved for device core*/
 329         struct dev_pm_info      power;
 330
 331         u64             *dma_mask;      /* dma mask (if dma'able device) */
 332         u64             coherent_dma_mask;/* Like dma_mask, but for
 333                                              alloc_coherent mappings as
 334                                              not all hardware supports
 335                                              64 bit addresses for consistent
 336                                              allocations such descriptors. */
 337
 338         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 339
 340         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 341                                              override */
 342
 343         /* class_device migration path */
 344         struct list_head        node;
 345         struct class            *class;         /* optional*/
 346         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 347         struct attribute_group  **groups;       /* optional groups */
 348
 349         void    (*release)(struct device * dev);
 350 };
 351
 352 static inline void *
 353 dev_get_drvdata (struct device *dev)
 354 {
 355         return dev->driver_data;
 356 }
 357
 358 static inline void
 359 dev_set_drvdata (struct device *dev, void *data)
 360 {
 361         dev->driver_data = data;
 362 }
 363
 364 static inline int device_is_registered(struct device *dev)
 365 {
 366         return klist_node_attached(&dev->knode_bus);
 367 }
 368
 369 /*
 370  * High level routines for use by the bus drivers
 371  */
 372 extern int device_register(struct device * dev);
 373 extern void device_unregister(struct device * dev);
 374 extern void device_initialize(struct device * dev);
 375 extern int device_add(struct device * dev);
 376 extern void device_del(struct device * dev);
 377 extern int device_for_each_child(struct device *, void *,
 378                      int (*fn)(struct device *, void *));
 379
 380 /*
 381  * Manual binding of a device to driver. See drivers/base/bus.c
 382  * for information on use.
 383  */
 384 extern void device_bind_driver(struct device * dev);
 385 extern void device_release_driver(struct device * dev);
 386 extern int  device_attach(struct device * dev);
 387 extern void driver_attach(struct device_driver * drv);
 388 extern void device_reprobe(struct device *dev);
 389
 390 /*
 391  * Easy functions for dynamically creating devices on the fly
 392  */
 393 extern struct device *device_create(struct class *cls, struct device *parent,
 394                                     dev_t devt, const char *fmt, ...)
 395                                     __attribute__((format(printf,4,5)));
 396 extern void device_destroy(struct class *cls, dev_t devt);
 397
 398 /*
 399  * Platform "fixup" functions - allow the platform to have their say
 400  * about devices and actions that the general device layer doesn't
 401  * know about.
 402  */
 403 /* Notify platform of device discovery */
 404 extern int (*platform_notify)(struct device * dev);
 405
 406 extern int (*platform_notify_remove)(struct device * dev);
 407
 408
 409 /**
 410  * get_device - atomically increment the reference count for the device.
 411  *
 412  */
 413 extern struct device * get_device(struct device * dev);
 414 extern void put_device(struct device * dev);
 415
 416
 417 /* drivers/base/power/shutdown.c */
 418 extern void device_shutdown(void);
 419
 420
 421 /* drivers/base/firmware.c */
 422 extern int firmware_register(struct subsystem *);
 423 extern void firmware_unregister(struct subsystem *);
 424
 425 /* debugging and troubleshooting/diagnostic helpers. */
 426 extern const char *dev_driver_string(struct device *dev);
 427 #define dev_printk(level, dev, format, arg...)  \
 428         printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
 429
 430 #ifdef DEBUG
 431 #define dev_dbg(dev, format, arg...)            \
 432         dev_printk(KERN_DEBUG , dev , format , ## arg)
 433 #else
 434 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
 435 #endif
 436
 437 #define dev_err(dev, format, arg...)            \
 438         dev_printk(KERN_ERR , dev , format , ## arg)
 439 #define dev_info(dev, format, arg...)           \
 440         dev_printk(KERN_INFO , dev , format , ## arg)
 441 #define dev_warn(dev, format, arg...)           \
 442         dev_printk(KERN_WARNING , dev , format , ## arg)
 443 #define dev_notice(dev, format, arg...)         \
 444         dev_printk(KERN_NOTICE , dev , format , ## arg)
 445
 446 /* Create alias, so I can be autoloaded. */
 447 #define MODULE_ALIAS_CHARDEV(major,minor) \
 448         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 449 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 450         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 451 #endif /* _DEVICE_H_ */