linux/drivers/cpuidle/cpuidle.h
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   1/*
   2 * cpuidle.h - The internal header file
   3 */
   4
   5#ifndef __DRIVER_CPUIDLE_H
   6#define __DRIVER_CPUIDLE_H
   7
   8#include <linux/device.h>
   9
  10/* For internal use only */
  11extern struct cpuidle_governor *cpuidle_curr_governor;
  12extern struct list_head cpuidle_governors;
  13extern struct list_head cpuidle_detected_devices;
  14extern struct mutex cpuidle_lock;
  15extern spinlock_t cpuidle_driver_lock;
  16extern int cpuidle_disabled(void);
  17extern int cpuidle_enter_state(struct cpuidle_device *dev,
  18                struct cpuidle_driver *drv, int next_state);
  19
  20/* idle loop */
  21extern void cpuidle_install_idle_handler(void);
  22extern void cpuidle_uninstall_idle_handler(void);
  23
  24/* governors */
  25extern int cpuidle_switch_governor(struct cpuidle_governor *gov);
  26
  27/* sysfs */
  28extern int cpuidle_add_interface(struct device *dev);
  29extern void cpuidle_remove_interface(struct device *dev);
  30extern int cpuidle_add_state_sysfs(struct cpuidle_device *device);
  31extern void cpuidle_remove_state_sysfs(struct cpuidle_device *device);
  32extern int cpuidle_add_sysfs(struct device *dev);
  33extern void cpuidle_remove_sysfs(struct device *dev);
  34
  35#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED
  36bool cpuidle_state_is_coupled(struct cpuidle_device *dev,
  37                struct cpuidle_driver *drv, int state);
  38int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
  39                struct cpuidle_driver *drv, int next_state);
  40int cpuidle_coupled_register_device(struct cpuidle_device *dev);
  41void cpuidle_coupled_unregister_device(struct cpuidle_device *dev);
  42#else
  43static inline bool cpuidle_state_is_coupled(struct cpuidle_device *dev,
  44                struct cpuidle_driver *drv, int state)
  45{
  46        return false;
  47}
  48
  49static inline int cpuidle_enter_state_coupled(struct cpuidle_device *dev,
  50                struct cpuidle_driver *drv, int next_state)
  51{
  52        return -1;
  53}
  54
  55static inline int cpuidle_coupled_register_device(struct cpuidle_device *dev)
  56{
  57        return 0;
  58}
  59
  60static inline void cpuidle_coupled_unregister_device(struct cpuidle_device *dev)
  61{
  62}
  63#endif
  64
  65#endif /* __DRIVER_CPUIDLE_H */
  66
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