/*
   * pm_runtime.h - Device run-time power management helper functions.
   *
   * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
   *
   * This file is released under the GPLv2.
   */
  
  #ifndef _LINUX_PM_RUNTIME_H
  #define _LINUX_PM_RUNTIME_H
  
  #include <linux/device.h>

  #include <linux/notifier.h>

  #include <linux/pm.h>

  #include <linux/jiffies.h>

  /* Runtime PM flag argument bits */
  #define RPM_ASYNC		0x01	/* Request is asynchronous */
  #define RPM_NOWAIT		0x02	/* Don't wait for concurrent
  					    state change */

  #define RPM_GET_PUT		0x04	/* Increment/decrement the
  					    usage_count */

  #define RPM_AUTO		0x08	/* Use autosuspend_delay */

  #ifdef CONFIG_PM

  extern struct workqueue_struct *pm_wq;
  
  static inline bool queue_pm_work(struct work_struct *work)
  {
  	return queue_work(pm_wq, work);
  }

  extern int pm_generic_runtime_suspend(struct device *dev);
  extern int pm_generic_runtime_resume(struct device *dev);

  extern int pm_runtime_force_suspend(struct device *dev);
  extern int pm_runtime_force_resume(struct device *dev);

  extern int __pm_runtime_idle(struct device *dev, int rpmflags);
  extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
  extern int __pm_runtime_resume(struct device *dev, int rpmflags);

  extern int pm_runtime_get_if_in_use(struct device *dev);

  extern int pm_schedule_suspend(struct device *dev, unsigned int delay);

  extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
  extern int pm_runtime_barrier(struct device *dev);
  extern void pm_runtime_enable(struct device *dev);
  extern void __pm_runtime_disable(struct device *dev, bool check_resume);

  extern void pm_runtime_allow(struct device *dev);
  extern void pm_runtime_forbid(struct device *dev);

  extern void pm_runtime_no_callbacks(struct device *dev);

  extern void pm_runtime_irq_safe(struct device *dev);

  extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
  extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
  extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev);

  extern void pm_runtime_update_max_time_suspended(struct device *dev,
  						 s64 delta_ns);

  extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);

  static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
  {
  	dev->power.ignore_children = enable;
  }

  static inline bool pm_children_suspended(struct device *dev)
  {
  	return dev->power.ignore_children
  		|| !atomic_read(&dev->power.child_count);
  }

  static inline void pm_runtime_get_noresume(struct device *dev)
  {
  	atomic_inc(&dev->power.usage_count);
  }
  
  static inline void pm_runtime_put_noidle(struct device *dev)
  {
  	atomic_add_unless(&dev->power.usage_count, -1, 0);
  }

  static inline bool device_run_wake(struct device *dev)
  {
  	return dev->power.run_wake;
  }
  
  static inline void device_set_run_wake(struct device *dev, bool enable)
  {
  	dev->power.run_wake = enable;
  }

  static inline bool pm_runtime_suspended(struct device *dev)
  {

  	return dev->power.runtime_status == RPM_SUSPENDED
  		&& !dev->power.disable_depth;

  }

  static inline bool pm_runtime_active(struct device *dev)
  {
  	return dev->power.runtime_status == RPM_ACTIVE
  		|| dev->power.disable_depth;
  }

  static inline bool pm_runtime_status_suspended(struct device *dev)
  {
  	return dev->power.runtime_status == RPM_SUSPENDED;
  }

  static inline bool pm_runtime_enabled(struct device *dev)
  {
  	return !dev->power.disable_depth;
  }

  static inline bool pm_runtime_callbacks_present(struct device *dev)
  {
  	return !dev->power.no_callbacks;
  }

  static inline void pm_runtime_mark_last_busy(struct device *dev)
  {
  	ACCESS_ONCE(dev->power.last_busy) = jiffies;
  }

  static inline bool pm_runtime_is_irq_safe(struct device *dev)
  {
  	return dev->power.irq_safe;
  }

  #else /* !CONFIG_PM */
  
  static inline bool queue_pm_work(struct work_struct *work) { return false; }
  
  static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
  static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
  static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
  static inline int pm_runtime_force_resume(struct device *dev) { return 0; }

  static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
  {
  	return -ENOSYS;
  }
  static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
  {
  	return -ENOSYS;
  }
  static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
  {
  	return 1;
  }

  static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
  {
  	return -ENOSYS;
  }

  static inline int pm_runtime_get_if_in_use(struct device *dev)
  {
  	return -EINVAL;
  }

  static inline int __pm_runtime_set_status(struct device *dev,
  					    unsigned int status) { return 0; }
  static inline int pm_runtime_barrier(struct device *dev) { return 0; }
  static inline void pm_runtime_enable(struct device *dev) {}
  static inline void __pm_runtime_disable(struct device *dev, bool c) {}

  static inline void pm_runtime_allow(struct device *dev) {}
  static inline void pm_runtime_forbid(struct device *dev) {}

  static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}

  static inline bool pm_children_suspended(struct device *dev) { return false; }

  static inline void pm_runtime_get_noresume(struct device *dev) {}
  static inline void pm_runtime_put_noidle(struct device *dev) {}

  static inline bool device_run_wake(struct device *dev) { return false; }
  static inline void device_set_run_wake(struct device *dev, bool enable) {}

  static inline bool pm_runtime_suspended(struct device *dev) { return false; }

  static inline bool pm_runtime_active(struct device *dev) { return true; }

  static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }

  static inline bool pm_runtime_enabled(struct device *dev) { return false; }

  static inline void pm_runtime_no_callbacks(struct device *dev) {}

  static inline void pm_runtime_irq_safe(struct device *dev) {}

  static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }

  static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; }

  static inline void pm_runtime_mark_last_busy(struct device *dev) {}
  static inline void __pm_runtime_use_autosuspend(struct device *dev,
  						bool use) {}
  static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
  						int delay) {}
  static inline unsigned long pm_runtime_autosuspend_expiration(
  				struct device *dev) { return 0; }

  static inline void pm_runtime_set_memalloc_noio(struct device *dev,
  						bool enable){}

  #endif /* !CONFIG_PM */

  static inline int pm_runtime_idle(struct device *dev)
  {
  	return __pm_runtime_idle(dev, 0);
  }
  
  static inline int pm_runtime_suspend(struct device *dev)
  {
  	return __pm_runtime_suspend(dev, 0);
  }

  static inline int pm_runtime_autosuspend(struct device *dev)
  {
  	return __pm_runtime_suspend(dev, RPM_AUTO);
  }

  static inline int pm_runtime_resume(struct device *dev)
  {
  	return __pm_runtime_resume(dev, 0);
  }
  
  static inline int pm_request_idle(struct device *dev)
  {
  	return __pm_runtime_idle(dev, RPM_ASYNC);
  }
  
  static inline int pm_request_resume(struct device *dev)
  {
  	return __pm_runtime_resume(dev, RPM_ASYNC);
  }

  static inline int pm_request_autosuspend(struct device *dev)
  {
  	return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
  }

  static inline int pm_runtime_get(struct device *dev)
  {

  	return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);

  }
  
  static inline int pm_runtime_get_sync(struct device *dev)
  {

  	return __pm_runtime_resume(dev, RPM_GET_PUT);

  }
  
  static inline int pm_runtime_put(struct device *dev)
  {

  	return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);

  }

  static inline int pm_runtime_put_autosuspend(struct device *dev)
  {
  	return __pm_runtime_suspend(dev,
  	    RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
  }

  static inline int pm_runtime_put_sync(struct device *dev)
  {

  	return __pm_runtime_idle(dev, RPM_GET_PUT);

  }

  static inline int pm_runtime_put_sync_suspend(struct device *dev)
  {
  	return __pm_runtime_suspend(dev, RPM_GET_PUT);
  }

  static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
  {
  	return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
  }

  static inline int pm_runtime_set_active(struct device *dev)
  {
  	return __pm_runtime_set_status(dev, RPM_ACTIVE);
  }
  
  static inline void pm_runtime_set_suspended(struct device *dev)
  {
  	__pm_runtime_set_status(dev, RPM_SUSPENDED);
  }
  
  static inline void pm_runtime_disable(struct device *dev)
  {
  	__pm_runtime_disable(dev, true);
  }

  static inline void pm_runtime_use_autosuspend(struct device *dev)
  {
  	__pm_runtime_use_autosuspend(dev, true);
  }
  
  static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
  {
  	__pm_runtime_use_autosuspend(dev, false);
  }

  #endif