LXR linux/include/linux/pm

   1/*
   2 * pm_runtime.h - Device run-time power management helper functions.
   3 *
   4 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
   5 *
   6 * This file is released under the GPLv2.
   7 */
   8
   9#ifndef _LINUX_PM_RUNTIME_H
  10#define _LINUX_PM_RUNTIME_H
  11
  12#include <linux/device.h>
  13#include <linux/pm.h>
  14
  15#ifdef CONFIG_PM_RUNTIME
  16
  17extern struct workqueue_struct *pm_wq;
  18
  19extern int pm_runtime_idle(struct device *dev);
  20extern int pm_runtime_suspend(struct device *dev);
  21extern int pm_runtime_resume(struct device *dev);
  22extern int pm_request_idle(struct device *dev);
  23extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
  24extern int pm_request_resume(struct device *dev);
  25extern int __pm_runtime_get(struct device *dev, bool sync);
  26extern int __pm_runtime_put(struct device *dev, bool sync);
  27extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
  28extern int pm_runtime_barrier(struct device *dev);
  29extern void pm_runtime_enable(struct device *dev);
  30extern void __pm_runtime_disable(struct device *dev, bool check_resume);
  31
  32static inline bool pm_children_suspended(struct device *dev)
  33{
  34        return dev->power.ignore_children
  35                || !atomic_read(&dev->power.child_count);
  36}
  37
  38static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
  39{
  40        dev->power.ignore_children = enable;
  41}
  42
  43static inline void pm_runtime_get_noresume(struct device *dev)
  44{
  45        atomic_inc(&dev->power.usage_count);
  46}
  47
  48static inline void pm_runtime_put_noidle(struct device *dev)
  49{
  50        atomic_add_unless(&dev->power.usage_count, -1, 0);
  51}
  52
  53#else /* !CONFIG_PM_RUNTIME */
  54
  55static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
  56static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; }
  57static inline int pm_runtime_resume(struct device *dev) { return 0; }
  58static inline int pm_request_idle(struct device *dev) { return -ENOSYS; }
  59static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
  60{
  61        return -ENOSYS;
  62}
  63static inline int pm_request_resume(struct device *dev) { return 0; }
  64static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; }
  65static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; }
  66static inline int __pm_runtime_set_status(struct device *dev,
  67                                            unsigned int status) { return 0; }
  68static inline int pm_runtime_barrier(struct device *dev) { return 0; }
  69static inline void pm_runtime_enable(struct device *dev) {}
  70static inline void __pm_runtime_disable(struct device *dev, bool c) {}
  71
  72static inline bool pm_children_suspended(struct device *dev) { return false; }
  73static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
  74static inline void pm_runtime_get_noresume(struct device *dev) {}
  75static inline void pm_runtime_put_noidle(struct device *dev) {}
  76
  77#endif /* !CONFIG_PM_RUNTIME */
  78
  79static inline int pm_runtime_get(struct device *dev)
  80{
  81        return __pm_runtime_get(dev, false);
  82}
  83
  84static inline int pm_runtime_get_sync(struct device *dev)
  85{
  86        return __pm_runtime_get(dev, true);
  87}
  88
  89static inline int pm_runtime_put(struct device *dev)
  90{
  91        return __pm_runtime_put(dev, false);
  92}
  93
  94static inline int pm_runtime_put_sync(struct device *dev)
  95{
  96        return __pm_runtime_put(dev, true);
  97}
  98
  99static inline int pm_runtime_set_active(struct device *dev)
 100{
 101        return __pm_runtime_set_status(dev, RPM_ACTIVE);
 102}
 103
 104static inline void pm_runtime_set_suspended(struct device *dev)
 105{
 106        __pm_runtime_set_status(dev, RPM_SUSPENDED);
 107}
 108
 109static inline void pm_runtime_disable(struct device *dev)
 110{
 111        __pm_runtime_disable(dev, true);
 112}
 113
 114#endif
 115