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