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/compiler.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
  56         int (*suspend)(struct device * dev, pm_message_t state);
  57         int (*suspend_late)(struct device * dev, pm_message_t state);
  58         int (*resume_early)(struct device * dev);
  59         int (*resume)(struct device * dev);
  60 };
  61
  62 extern int __must_check bus_register(struct bus_type * bus);
  63 extern void bus_unregister(struct bus_type * bus);
  64
  65 extern int __must_check bus_rescan_devices(struct bus_type * bus);
  66
  67 /* iterator helpers for buses */
  68
  69 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  70                      int (*fn)(struct device *, void *));
  71 struct device * bus_find_device(struct bus_type *bus, struct device *start,
  72                                 void *data, int (*match)(struct device *, void *));
  73
  74 int __must_check bus_for_each_drv(struct bus_type *bus,
  75                 struct device_driver *start, void *data,
  76                 int (*fn)(struct device_driver *, void *));
  77
  78 /* driverfs interface for exporting bus attributes */
  79
  80 struct bus_attribute {
  81         struct attribute        attr;
  82         ssize_t (*show)(struct bus_type *, char * buf);
  83         ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
  84 };
  85
  86 #define BUS_ATTR(_name,_mode,_show,_store)      \
  87 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
  88
  89 extern int __must_check bus_create_file(struct bus_type *,
  90                                         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         unsigned int multithread_probe:1;
 111 };
 112
 113
 114 extern int __must_check driver_register(struct device_driver * drv);
 115 extern void driver_unregister(struct device_driver * drv);
 116
 117 extern struct device_driver * get_driver(struct device_driver * drv);
 118 extern void put_driver(struct device_driver * drv);
 119 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 120 extern int driver_probe_done(void);
 121
 122 /* driverfs interface for exporting driver attributes */
 123
 124 struct driver_attribute {
 125         struct attribute        attr;
 126         ssize_t (*show)(struct device_driver *, char * buf);
 127         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 128 };
 129
 130 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 131 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 132
 133 extern int __must_check driver_create_file(struct device_driver *,
 134                                         struct driver_attribute *);
 135 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 136
 137 extern int __must_check driver_for_each_device(struct device_driver * drv,
 138                 struct device *start, void *data,
 139                 int (*fn)(struct device *, void *));
 140 struct device * driver_find_device(struct device_driver *drv,
 141                                    struct device *start, void *data,
 142                                    int (*match)(struct device *, void *));
 143
 144 /*
 145  * device classes
 146  */
 147 struct class {
 148         const char              * name;
 149         struct module           * owner;
 150
 151         struct subsystem        subsys;
 152         struct list_head        children;
 153         struct list_head        devices;
 154         struct list_head        interfaces;
 155         struct semaphore        sem;    /* locks both the children and interfaces lists */
 156
 157         struct kobject          *virtual_dir;
 158
 159         struct class_attribute          * class_attrs;
 160         struct class_device_attribute   * class_dev_attrs;
 161         struct device_attribute         * dev_attrs;
 162
 163         int     (*uevent)(struct class_device *dev, char **envp,
 164                            int num_envp, char *buffer, int buffer_size);
 165         int     (*dev_uevent)(struct device *dev, char **envp, int num_envp,
 166                                 char *buffer, int buffer_size);
 167
 168         void    (*release)(struct class_device *dev);
 169         void    (*class_release)(struct class *class);
 170         void    (*dev_release)(struct device *dev);
 171
 172         int     (*suspend)(struct device *, pm_message_t state);
 173         int     (*resume)(struct device *);
 174 };
 175
 176 extern int __must_check class_register(struct class *);
 177 extern void class_unregister(struct class *);
 178
 179
 180 struct class_attribute {
 181         struct attribute        attr;
 182         ssize_t (*show)(struct class *, char * buf);
 183         ssize_t (*store)(struct class *, const char * buf, size_t count);
 184 };
 185
 186 #define CLASS_ATTR(_name,_mode,_show,_store)                    \
 187 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
 188
 189 extern int __must_check class_create_file(struct class *,
 190                                         const struct class_attribute *);
 191 extern void class_remove_file(struct class *, const struct class_attribute *);
 192
 193 struct class_device_attribute {
 194         struct attribute        attr;
 195         ssize_t (*show)(struct class_device *, char * buf);
 196         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 197 };
 198
 199 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 200 struct class_device_attribute class_device_attr_##_name =       \
 201         __ATTR(_name,_mode,_show,_store)
 202
 203 extern int __must_check class_device_create_file(struct class_device *,
 204                                     const struct class_device_attribute *);
 205
 206 /**
 207  * struct class_device - class devices
 208  * @class: pointer to the parent class for this class device.  This is required.
 209  * @devt: for internal use by the driver core only.
 210  * @node: for internal use by the driver core only.
 211  * @kobj: for internal use by the driver core only.
 212  * @devt_attr: for internal use by the driver core only.
 213  * @groups: optional additional groups to be created
 214  * @dev: if set, a symlink to the struct device is created in the sysfs
 215  * directory for this struct class device.
 216  * @class_data: pointer to whatever you want to store here for this struct
 217  * class_device.  Use class_get_devdata() and class_set_devdata() to get and
 218  * set this pointer.
 219  * @parent: pointer to a struct class_device that is the parent of this struct
 220  * class_device.  If NULL, this class_device will show up at the root of the
 221  * struct class in sysfs (which is probably what you want to have happen.)
 222  * @release: pointer to a release function for this struct class_device.  If
 223  * set, this will be called instead of the class specific release function.
 224  * Only use this if you want to override the default release function, like
 225  * when you are nesting class_device structures.
 226  * @uevent: pointer to a uevent function for this struct class_device.  If
 227  * set, this will be called instead of the class specific uevent function.
 228  * Only use this if you want to override the default uevent function, like
 229  * when you are nesting class_device structures.
 230  */
 231 struct class_device {
 232         struct list_head        node;
 233
 234         struct kobject          kobj;
 235         struct class            * class;        /* required */
 236         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 237         struct class_device_attribute *devt_attr;
 238         struct class_device_attribute uevent_attr;
 239         struct device           * dev;          /* not necessary, but nice to have */
 240         void                    * class_data;   /* class-specific data */
 241         struct class_device     *parent;        /* parent of this child device, if there is one */
 242         struct attribute_group  ** groups;      /* optional groups */
 243
 244         void    (*release)(struct class_device *dev);
 245         int     (*uevent)(struct class_device *dev, char **envp,
 246                            int num_envp, char *buffer, int buffer_size);
 247         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 248 };
 249
 250 static inline void *
 251 class_get_devdata (struct class_device *dev)
 252 {
 253         return dev->class_data;
 254 }
 255
 256 static inline void
 257 class_set_devdata (struct class_device *dev, void *data)
 258 {
 259         dev->class_data = data;
 260 }
 261
 262
 263 extern int __must_check class_device_register(struct class_device *);
 264 extern void class_device_unregister(struct class_device *);
 265 extern void class_device_initialize(struct class_device *);
 266 extern int __must_check class_device_add(struct class_device *);
 267 extern void class_device_del(struct class_device *);
 268
 269 extern int class_device_rename(struct class_device *, char *);
 270
 271 extern struct class_device * class_device_get(struct class_device *);
 272 extern void class_device_put(struct class_device *);
 273
 274 extern void class_device_remove_file(struct class_device *,
 275                                      const struct class_device_attribute *);
 276 extern int __must_check class_device_create_bin_file(struct class_device *,
 277                                         struct bin_attribute *);
 278 extern void class_device_remove_bin_file(struct class_device *,
 279                                          struct bin_attribute *);
 280
 281 struct class_interface {
 282         struct list_head        node;
 283         struct class            *class;
 284
 285         int (*add)      (struct class_device *, struct class_interface *);
 286         void (*remove)  (struct class_device *, struct class_interface *);
 287         int (*add_dev)          (struct device *, struct class_interface *);
 288         void (*remove_dev)      (struct device *, struct class_interface *);
 289 };
 290
 291 extern int __must_check class_interface_register(struct class_interface *);
 292 extern void class_interface_unregister(struct class_interface *);
 293
 294 extern struct class *class_create(struct module *owner, const char *name);
 295 extern void class_destroy(struct class *cls);
 296 extern struct class_device *class_device_create(struct class *cls,
 297                                                 struct class_device *parent,
 298                                                 dev_t devt,
 299                                                 struct device *device,
 300                                                 const char *fmt, ...)
 301                                         __attribute__((format(printf,5,6)));
 302 extern void class_device_destroy(struct class *cls, dev_t devt);
 303
 304 /* interface for exporting device attributes */
 305 struct device_attribute {
 306         struct attribute        attr;
 307         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 308                         char *buf);
 309         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 310                          const char *buf, size_t count);
 311 };
 312
 313 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 314 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 315
 316 extern int __must_check device_create_file(struct device *device,
 317                                         struct device_attribute * entry);
 318 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 319 extern int __must_check device_create_bin_file(struct device *dev,
 320                                                struct bin_attribute *attr);
 321 extern void device_remove_bin_file(struct device *dev,
 322                                    struct bin_attribute *attr);
 323 struct device {
 324         struct klist            klist_children;
 325         struct klist_node       knode_parent;           /* node in sibling list */
 326         struct klist_node       knode_driver;
 327         struct klist_node       knode_bus;
 328         struct device   * parent;
 329
 330         struct kobject kobj;
 331         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 332         struct device_attribute uevent_attr;
 333         struct device_attribute *devt_attr;
 334
 335         struct semaphore        sem;    /* semaphore to synchronize calls to
 336                                          * its driver.
 337                                          */
 338
 339         struct bus_type * bus;          /* type of bus device is on */
 340         struct device_driver *driver;   /* which driver has allocated this
 341                                            device */
 342         void            *driver_data;   /* data private to the driver */
 343         void            *platform_data; /* Platform specific data, device
 344                                            core doesn't touch it */
 345         void            *firmware_data; /* Firmware specific data (e.g. ACPI,
 346                                            BIOS data),reserved for device core*/
 347         struct dev_pm_info      power;
 348
 349         u64             *dma_mask;      /* dma mask (if dma'able device) */
 350         u64             coherent_dma_mask;/* Like dma_mask, but for
 351                                              alloc_coherent mappings as
 352                                              not all hardware supports
 353                                              64 bit addresses for consistent
 354                                              allocations such descriptors. */
 355
 356         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 357
 358         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 359                                              override */
 360
 361         /* class_device migration path */
 362         struct list_head        node;
 363         struct class            *class;         /* optional*/
 364         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 365         struct attribute_group  **groups;       /* optional groups */
 366
 367         void    (*release)(struct device * dev);
 368 };
 369
 370 static inline void *
 371 dev_get_drvdata (struct device *dev)
 372 {
 373         return dev->driver_data;
 374 }
 375
 376 static inline void
 377 dev_set_drvdata (struct device *dev, void *data)
 378 {
 379         dev->driver_data = data;
 380 }
 381
 382 static inline int device_is_registered(struct device *dev)
 383 {
 384         return klist_node_attached(&dev->knode_bus);
 385 }
 386
 387 /*
 388  * High level routines for use by the bus drivers
 389  */
 390 extern int __must_check device_register(struct device * dev);
 391 extern void device_unregister(struct device * dev);
 392 extern void device_initialize(struct device * dev);
 393 extern int __must_check device_add(struct device * dev);
 394 extern void device_del(struct device * dev);
 395 extern int __must_check device_for_each_child(struct device *, void *,
 396                      int (*fn)(struct device *, void *));
 397 extern int device_rename(struct device *dev, char *new_name);
 398
 399 /*
 400  * Manual binding of a device to driver. See drivers/base/bus.c
 401  * for information on use.
 402  */
 403 extern int __must_check device_bind_driver(struct device *dev);
 404 extern void device_release_driver(struct device * dev);
 405 extern int  __must_check device_attach(struct device * dev);
 406 extern int __must_check driver_attach(struct device_driver *drv);
 407 extern int __must_check device_reprobe(struct device *dev);
 408
 409 /*
 410  * Easy functions for dynamically creating devices on the fly
 411  */
 412 extern struct device *device_create(struct class *cls, struct device *parent,
 413                                     dev_t devt, const char *fmt, ...)
 414                                     __attribute__((format(printf,4,5)));
 415 extern void device_destroy(struct class *cls, dev_t devt);
 416
 417 extern int virtual_device_parent(struct device *dev);
 418
 419 /*
 420  * Platform "fixup" functions - allow the platform to have their say
 421  * about devices and actions that the general device layer doesn't
 422  * know about.
 423  */
 424 /* Notify platform of device discovery */
 425 extern int (*platform_notify)(struct device * dev);
 426
 427 extern int (*platform_notify_remove)(struct device * dev);
 428
 429
 430 /**
 431  * get_device - atomically increment the reference count for the device.
 432  *
 433  */
 434 extern struct device * get_device(struct device * dev);
 435 extern void put_device(struct device * dev);
 436
 437
 438 /* drivers/base/power/shutdown.c */
 439 extern void device_shutdown(void);
 440
 441
 442 /* drivers/base/firmware.c */
 443 extern int __must_check firmware_register(struct subsystem *);
 444 extern void firmware_unregister(struct subsystem *);
 445
 446 /* debugging and troubleshooting/diagnostic helpers. */
 447 extern const char *dev_driver_string(struct device *dev);
 448 #define dev_printk(level, dev, format, arg...)  \
 449         printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
 450
 451 #ifdef DEBUG
 452 #define dev_dbg(dev, format, arg...)            \
 453         dev_printk(KERN_DEBUG , dev , format , ## arg)
 454 #else
 455 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
 456 #endif
 457
 458 #define dev_err(dev, format, arg...)            \
 459         dev_printk(KERN_ERR , dev , format , ## arg)
 460 #define dev_info(dev, format, arg...)           \
 461         dev_printk(KERN_INFO , dev , format , ## arg)
 462 #define dev_warn(dev, format, arg...)           \
 463         dev_printk(KERN_WARNING , dev , format , ## arg)
 464 #define dev_notice(dev, format, arg...)         \
 465         dev_printk(KERN_NOTICE , dev , format , ## arg)
 466
 467 /* Create alias, so I can be autoloaded. */
 468 #define MODULE_ALIAS_CHARDEV(major,minor) \
 469         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 470 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 471         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 472 #endif /* _DEVICE_H_ */