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
  27 struct sys_device;
  28
  29 struct 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
  40 extern int sysdev_class_register(struct sysdev_class *);
  41 extern void sysdev_class_unregister(struct sysdev_class *);
  42
  43
  44 /**
  45  * Auxillary system device drivers.
  46  */
  47
  48 struct 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
  58 extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
  59 extern 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
  67 struct sys_device {
  68         u32             id;
  69         struct sysdev_class     * cls;
  70         struct kobject          kobj;
  71 };
  72
  73 extern int sysdev_register(struct sys_device *);
  74 extern void sysdev_unregister(struct sys_device *);
  75
  76
  77 struct 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)           \
  85 struct sysdev_attribute attr_##_name = {                        \
  86         .attr = {.name = __stringify(_name), .mode = _mode },   \
  87         .show   = _show,                                        \
  88         .store  = _store,                                       \
  89 };
  90
  91 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
  92 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
  93
  94 #endif /* _SYSDEV_H_ */