LXR linux-bk/include/linux/sysdev.h

   1/**
   2 * System devices follow a slightly different driver model. 
   3 * They don't need to do dynammic driver binding, can't be probed, 
   4 * and don't reside on any type of peripheral bus. 
   5 * So, we represent and treat them a little differently.
   6 * 
   7 * We still have a notion of a driver for a system device, because we still
   8 * want to perform basic operations on these devices. 
   9 *
  10 * We also support auxillary drivers binding to devices of a certain class.
  11 * 
  12 * This allows configurable drivers to register themselves for devices of
  13 * a certain type. And, it allows class definitions to reside in generic
  14 * code while arch-specific code can register specific drivers.
  15 *
  16 * Auxillary drivers registered with a NULL cls are registered as drivers
  17 * for all system devices, and get notification calls for each device. 
  18 */
  19
  20
  21#ifndef _SYSDEV_H_
  22#define _SYSDEV_H_
  23
  24#include <linux/kobject.h>
  25
  26
  27struct sys_device;
  28
  29struct sysdev_class {
  30        struct list_head        drivers;
  31
  32        /* Default operations for these types of devices */
  33        int     (*shutdown)(struct sys_device *);
  34        int     (*suspend)(struct sys_device *, u32 state);
  35        int     (*resume)(struct sys_device *);
  36        struct kset             kset;
  37};
  38
  39
  40extern int sysdev_class_register(struct sysdev_class *);
  41extern void sysdev_class_unregister(struct sysdev_class *);
  42
  43
  44/**
  45 * Auxillary system device drivers.
  46 */
  47
  48struct sysdev_driver {
  49        struct list_head        entry;
  50        int     (*add)(struct sys_device *);
  51        int     (*remove)(struct sys_device *);
  52        int     (*shutdown)(struct sys_device *);
  53        int     (*suspend)(struct sys_device *, u32 state);
  54        int     (*resume)(struct sys_device *);
  55};
  56
  57
  58extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
  59extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
  60
  61
  62/**
  63 * sys_devices can be simplified a lot from regular devices, because they're
  64 * simply not as versatile. 
  65 */
  66
  67struct sys_device {
  68        u32             id;
  69        struct sysdev_class     * cls;
  70        struct kobject          kobj;
  71};
  72
  73extern int sysdev_register(struct sys_device *);
  74extern void sysdev_unregister(struct sys_device *);
  75
  76
  77struct sysdev_attribute { 
  78        struct attribute        attr;
  79        ssize_t (*show)(struct sys_device *, char *);
  80        ssize_t (*store)(struct sys_device *, const char *, size_t);
  81};
  82
  83
  84#define SYSDEV_ATTR(_name,_mode,_show,_store)           \
  85struct sysdev_attribute attr_##_name = {                        \
  86        .attr = {.name = __stringify(_name), .mode = _mode },   \
  87        .show   = _show,                                        \
  88        .store  = _store,                                       \
  89};
  90
  91extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
  92extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
  93
  94#endif /* _SYSDEV_H_ */
  95