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/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 enum {
  31         SUSPEND_NOTIFY,
  32         SUSPEND_SAVE_STATE,
  33         SUSPEND_DISABLE,
  34         SUSPEND_POWER_DOWN,
  35 };
  36
  37 enum {
  38         RESUME_POWER_ON,
  39         RESUME_RESTORE_STATE,
  40         RESUME_ENABLE,
  41 };
  42
  43 struct device;
  44 struct device_driver;
  45 struct class;
  46 struct class_device;
  47 struct class_simple;
  48
  49 struct bus_type {
  50         char                    * name;
  51
  52         struct subsystem        subsys;
  53         struct kset             drivers;
  54         struct kset             devices;
  55
  56         struct bus_attribute    * bus_attrs;
  57         struct device_attribute * dev_attrs;
  58         struct driver_attribute * drv_attrs;
  59
  60         int             (*match)(struct device * dev, struct device_driver * drv);
  61         int             (*hotplug) (struct device *dev, char **envp,
  62                                     int num_envp, char *buffer, int buffer_size);
  63         int             (*suspend)(struct device * dev, pm_message_t state);
  64         int             (*resume)(struct device * dev);
  65 };
  66
  67 extern int bus_register(struct bus_type * bus);
  68 extern void bus_unregister(struct bus_type * bus);
  69
  70 extern int bus_rescan_devices(struct bus_type * bus);
  71
  72 extern struct bus_type * get_bus(struct bus_type * bus);
  73 extern void put_bus(struct bus_type * bus);
  74
  75 extern struct bus_type * find_bus(char * name);
  76
  77 /* iterator helpers for buses */
  78
  79 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
  80                      int (*fn)(struct device *, void *));
  81
  82 int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
  83                      void * data, int (*fn)(struct device_driver *, void *));
  84
  85
  86 /* driverfs interface for exporting bus attributes */
  87
  88 struct bus_attribute {
  89         struct attribute        attr;
  90         ssize_t (*show)(struct bus_type *, char * buf);
  91         ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
  92 };
  93
  94 #define BUS_ATTR(_name,_mode,_show,_store)      \
  95 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
  96
  97 extern int bus_create_file(struct bus_type *, struct bus_attribute *);
  98 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  99
 100 struct device_driver {
 101         char                    * name;
 102         struct bus_type         * bus;
 103
 104         struct completion       unloaded;
 105         struct kobject          kobj;
 106         struct list_head        devices;
 107
 108         struct module           * owner;
 109
 110         int     (*probe)        (struct device * dev);
 111         int     (*remove)       (struct device * dev);
 112         void    (*shutdown)     (struct device * dev);
 113         int     (*suspend)      (struct device * dev, pm_message_t state, u32 level);
 114         int     (*resume)       (struct device * dev, u32 level);
 115 };
 116
 117
 118 extern int driver_register(struct device_driver * drv);
 119 extern void driver_unregister(struct device_driver * drv);
 120
 121 extern struct device_driver * get_driver(struct device_driver * drv);
 122 extern void put_driver(struct device_driver * drv);
 123 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
 124
 125
 126 /* driverfs interface for exporting driver attributes */
 127
 128 struct driver_attribute {
 129         struct attribute        attr;
 130         ssize_t (*show)(struct device_driver *, char * buf);
 131         ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
 132 };
 133
 134 #define DRIVER_ATTR(_name,_mode,_show,_store)   \
 135 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
 136
 137 extern int driver_create_file(struct device_driver *, struct driver_attribute *);
 138 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
 139
 140
 141 /*
 142  * device classes
 143  */
 144 struct class {
 145         char                    * name;
 146
 147         struct subsystem        subsys;
 148         struct list_head        children;
 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     (*hotplug)(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
 162 extern int class_register(struct class *);
 163 extern void class_unregister(struct class *);
 164
 165 extern struct class * class_get(struct class *);
 166 extern void class_put(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
 182 struct class_device {
 183         struct list_head        node;
 184
 185         struct kobject          kobj;
 186         struct class            * class;        /* required */
 187         dev_t                   devt;           /* dev_t, creates the sysfs "dev" */
 188         struct device           * dev;          /* not necessary, but nice to have */
 189         void                    * class_data;   /* class-specific data */
 190
 191         char    class_id[BUS_ID_SIZE];  /* unique to this class */
 192 };
 193
 194 static inline void *
 195 class_get_devdata (struct class_device *dev)
 196 {
 197         return dev->class_data;
 198 }
 199
 200 static inline void
 201 class_set_devdata (struct class_device *dev, void *data)
 202 {
 203         dev->class_data = data;
 204 }
 205
 206
 207 extern int class_device_register(struct class_device *);
 208 extern void class_device_unregister(struct class_device *);
 209 extern void class_device_initialize(struct class_device *);
 210 extern int class_device_add(struct class_device *);
 211 extern void class_device_del(struct class_device *);
 212
 213 extern int class_device_rename(struct class_device *, char *);
 214
 215 extern struct class_device * class_device_get(struct class_device *);
 216 extern void class_device_put(struct class_device *);
 217
 218 struct class_device_attribute {
 219         struct attribute        attr;
 220         ssize_t (*show)(struct class_device *, char * buf);
 221         ssize_t (*store)(struct class_device *, const char * buf, size_t count);
 222 };
 223
 224 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store)             \
 225 struct class_device_attribute class_device_attr_##_name =       \
 226         __ATTR(_name,_mode,_show,_store)
 227
 228 extern int class_device_create_file(struct class_device *,
 229                                     const struct class_device_attribute *);
 230 extern void class_device_remove_file(struct class_device *,
 231                                      const struct class_device_attribute *);
 232 extern int class_device_create_bin_file(struct class_device *,
 233                                         struct bin_attribute *);
 234 extern void class_device_remove_bin_file(struct class_device *,
 235                                          struct bin_attribute *);
 236
 237 struct class_interface {
 238         struct list_head        node;
 239         struct class            *class;
 240
 241         int (*add)      (struct class_device *);
 242         void (*remove)  (struct class_device *);
 243 };
 244
 245 extern int class_interface_register(struct class_interface *);
 246 extern void class_interface_unregister(struct class_interface *);
 247
 248 /* interface for class simple stuff */
 249 extern struct class_simple *class_simple_create(struct module *owner, char *name);
 250 extern void class_simple_destroy(struct class_simple *cs);
 251 extern struct class_device *class_simple_device_add(struct class_simple *cs, dev_t dev, struct device *device, const char *fmt, ...)
 252         __attribute__((format(printf,4,5)));
 253 extern int class_simple_set_hotplug(struct class_simple *,
 254         int (*hotplug)(struct class_device *dev, char **envp, int num_envp, char *buffer, int buffer_size));
 255 extern void class_simple_device_remove(dev_t dev);
 256
 257
 258 struct device {
 259         struct list_head node;          /* node in sibling list */
 260         struct list_head bus_list;      /* node in bus's list */
 261         struct list_head driver_list;
 262         struct list_head children;
 263         struct device   * parent;
 264
 265         struct kobject kobj;
 266         char    bus_id[BUS_ID_SIZE];    /* position on parent bus */
 267
 268         struct bus_type * bus;          /* type of bus device is on */
 269         struct device_driver *driver;   /* which driver has allocated this
 270                                            device */
 271         void            *driver_data;   /* data private to the driver */
 272         void            *platform_data; /* Platform specific data, device
 273                                            core doesn't touch it */
 274         void            *firmware_data; /* Firmware specific data (e.g. ACPI,
 275                                            BIOS data),reserved for device core*/
 276         struct dev_pm_info      power;
 277
 278         u64             *dma_mask;      /* dma mask (if dma'able device) */
 279         u64             coherent_dma_mask;/* Like dma_mask, but for
 280                                              alloc_coherent mappings as
 281                                              not all hardware supports
 282                                              64 bit addresses for consistent
 283                                              allocations such descriptors. */
 284
 285         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
 286
 287         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
 288                                              override */
 289
 290         void    (*release)(struct device * dev);
 291 };
 292
 293 static inline struct device *
 294 list_to_dev(struct list_head *node)
 295 {
 296         return list_entry(node, struct device, node);
 297 }
 298
 299 static inline void *
 300 dev_get_drvdata (struct device *dev)
 301 {
 302         return dev->driver_data;
 303 }
 304
 305 static inline void
 306 dev_set_drvdata (struct device *dev, void *data)
 307 {
 308         dev->driver_data = data;
 309 }
 310
 311 /*
 312  * High level routines for use by the bus drivers
 313  */
 314 extern int device_register(struct device * dev);
 315 extern void device_unregister(struct device * dev);
 316 extern void device_initialize(struct device * dev);
 317 extern int device_add(struct device * dev);
 318 extern void device_del(struct device * dev);
 319 extern int device_for_each_child(struct device *, void *,
 320                      int (*fn)(struct device *, void *));
 321
 322 /*
 323  * Manual binding of a device to driver. See drivers/base/bus.c
 324  * for information on use.
 325  */
 326 extern int  driver_probe_device(struct device_driver * drv, struct device * dev);
 327 extern void device_bind_driver(struct device * dev);
 328 extern void device_release_driver(struct device * dev);
 329 extern int  device_attach(struct device * dev);
 330 extern void driver_attach(struct device_driver * drv);
 331
 332
 333 /* driverfs interface for exporting device attributes */
 334
 335 struct device_attribute {
 336         struct attribute        attr;
 337         ssize_t (*show)(struct device * dev, char * buf);
 338         ssize_t (*store)(struct device * dev, const char * buf, size_t count);
 339 };
 340
 341 #define DEVICE_ATTR(_name,_mode,_show,_store) \
 342 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
 343
 344
 345 extern int device_create_file(struct device *device, struct device_attribute * entry);
 346 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
 347
 348 /*
 349  * Platform "fixup" functions - allow the platform to have their say
 350  * about devices and actions that the general device layer doesn't
 351  * know about.
 352  */
 353 /* Notify platform of device discovery */
 354 extern int (*platform_notify)(struct device * dev);
 355
 356 extern int (*platform_notify_remove)(struct device * dev);
 357
 358
 359 /**
 360  * get_device - atomically increment the reference count for the device.
 361  *
 362  */
 363 extern struct device * get_device(struct device * dev);
 364 extern void put_device(struct device * dev);
 365 extern struct device *device_find(const char *name, struct bus_type *bus);
 366
 367
 368 /* drivers/base/platform.c */
 369
 370 struct platform_device {
 371         char            * name;
 372         u32             id;
 373         struct device   dev;
 374         u32             num_resources;
 375         struct resource * resource;
 376 };
 377
 378 #define to_platform_device(x) container_of((x), struct platform_device, dev)
 379
 380 extern int platform_device_register(struct platform_device *);
 381 extern void platform_device_unregister(struct platform_device *);
 382
 383 extern struct bus_type platform_bus_type;
 384 extern struct device platform_bus;
 385
 386 extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
 387 extern int platform_get_irq(struct platform_device *, unsigned int);
 388 extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, char *);
 389 extern int platform_get_irq_byname(struct platform_device *, char *);
 390 extern int platform_add_devices(struct platform_device **, int);
 391
 392 extern struct platform_device *platform_device_register_simple(char *, unsigned int, struct resource *, unsigned int);
 393
 394 /* drivers/base/power.c */
 395 extern void device_shutdown(void);
 396
 397
 398 /* drivers/base/firmware.c */
 399 extern int firmware_register(struct subsystem *);
 400 extern void firmware_unregister(struct subsystem *);
 401
 402 /* debugging and troubleshooting/diagnostic helpers. */
 403 #define dev_printk(level, dev, format, arg...)  \
 404         printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg)
 405
 406 #ifdef DEBUG
 407 #define dev_dbg(dev, format, arg...)            \
 408         dev_printk(KERN_DEBUG , dev , format , ## arg)
 409 #else
 410 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
 411 #endif
 412
 413 #define dev_err(dev, format, arg...)            \
 414         dev_printk(KERN_ERR , dev , format , ## arg)
 415 #define dev_info(dev, format, arg...)           \
 416         dev_printk(KERN_INFO , dev , format , ## arg)
 417 #define dev_warn(dev, format, arg...)           \
 418         dev_printk(KERN_WARNING , dev , format , ## arg)
 419
 420 /* Create alias, so I can be autoloaded. */
 421 #define MODULE_ALIAS_CHARDEV(major,minor) \
 422         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
 423 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
 424         MODULE_ALIAS("char-major-" __stringify(major) "-*")
 425 #endif /* _DEVICE_H_ */