include/notifier.h

   1 #ifndef __NOTIFIER_H
   2 #define __NOTIFIER_H
   3
   4 /*
   5  * Notifer chains loosely based on the according Linux framework
   6  */
   7
   8 struct notifier_block {
   9         int (*notifier_call)(struct notifier_block *, unsigned long, void *);
  10         struct list_head list;
  11 };
  12
  13 struct notifier_head {
  14         struct list_head blocks;
  15 };
  16
  17 int notifier_chain_register(struct notifier_head *nh, struct notifier_block *n);
  18
  19 int notifier_call_chain(struct notifier_head *nh, unsigned long val, void *v);
  20
  21 /*
  22  * Register a function which is called upon changes of
  23  * clock frequencies in the system.
  24  */
  25 int clock_register_client(struct notifier_block *nb);
  26 int clock_unregister_client(struct notifier_block *nb);
  27 int clock_notifier_call_chain(void);
  28
  29 #define NOTIFIER_HEAD(name)                                     \
  30         struct notifier_head name = {                           \
  31                 .blocks = LIST_HEAD_INIT((name).blocks),        \
  32         };
  33
  34 #endif /* __NOTIFIER_H */
  35