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 #include <linux/pm.h>
  26
  27
  28 struct sys_device;
  29
  30 struct sysdev_class {
  31         struct list_head        drivers;
  32
  33         /* Default operations for these types of devices */
  34         int     (*shutdown)(struct sys_device *);
  35         int     (*suspend)(struct sys_device *, pm_message_t state);
  36         int     (*resume)(struct sys_device *);
  37         struct kset             kset;
  38 };
  39
  40 struct sysdev_class_attribute {
  41         struct attribute attr;
  42         ssize_t (*show)(struct sysdev_class *, char *);
  43         ssize_t (*store)(struct sysdev_class *, const char *, size_t);
  44 };
  45
  46 #define SYSDEV_CLASS_ATTR(_name,_mode,_show,_store)             \
  47 struct sysdev_class_attribute attr_##_name = {                  \
  48         .attr = {.name = __stringify(_name), .mode = _mode },   \
  49         .show   = _show,                                        \
  50         .store  = _store,                                       \
  51 };
  52
  53
  54 extern int sysdev_class_register(struct sysdev_class *);
  55 extern void sysdev_class_unregister(struct sysdev_class *);
  56
  57 extern int sysdev_class_create_file(struct sysdev_class *,
  58         struct sysdev_class_attribute *);
  59 extern void sysdev_class_remove_file(struct sysdev_class *,
  60         struct sysdev_class_attribute *);
  61 /**
  62  * Auxillary system device drivers.
  63  */
  64
  65 struct sysdev_driver {
  66         struct list_head        entry;
  67         int     (*add)(struct sys_device *);
  68         int     (*remove)(struct sys_device *);
  69         int     (*shutdown)(struct sys_device *);
  70         int     (*suspend)(struct sys_device *, pm_message_t state);
  71         int     (*resume)(struct sys_device *);
  72 };
  73
  74
  75 extern int sysdev_driver_register(struct sysdev_class *, struct sysdev_driver *);
  76 extern void sysdev_driver_unregister(struct sysdev_class *, struct sysdev_driver *);
  77
  78
  79 /**
  80  * sys_devices can be simplified a lot from regular devices, because they're
  81  * simply not as versatile.
  82  */
  83
  84 struct sys_device {
  85         u32             id;
  86         struct sysdev_class     * cls;
  87         struct kobject          kobj;
  88 };
  89
  90 extern int sysdev_register(struct sys_device *);
  91 extern void sysdev_unregister(struct sys_device *);
  92
  93
  94 struct sysdev_attribute {
  95         struct attribute        attr;
  96         ssize_t (*show)(struct sys_device *, char *);
  97         ssize_t (*store)(struct sys_device *, const char *, size_t);
  98 };
  99
 100
 101 #define _SYSDEV_ATTR(_name,_mode,_show,_store)                  \
 102 {                                                               \
 103         .attr = { .name = __stringify(_name), .mode = _mode,    \
 104                  .owner = THIS_MODULE },                        \
 105         .show   = _show,                                        \
 106         .store  = _store,                                       \
 107 }
 108
 109 #define SYSDEV_ATTR(_name,_mode,_show,_store)           \
 110 struct sysdev_attribute attr_##_name = _SYSDEV_ATTR(_name,_mode,_show,_store);
 111
 112 extern int sysdev_create_file(struct sys_device *, struct sysdev_attribute *);
 113 extern void sysdev_remove_file(struct sys_device *, struct sysdev_attribute *);
 114
 115 #endif /* _SYSDEV_H_ */