include/linux/pm_runtime.h

   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
  17 extern struct workqueue_struct *pm_wq;
  18
  19 extern int pm_runtime_idle(struct device *dev);
  20 extern int pm_runtime_suspend(struct device *dev);
  21 extern int pm_runtime_resume(struct device *dev);
  22 extern int pm_request_idle(struct device *dev);
  23 extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
  24 extern int pm_request_resume(struct device *dev);
  25 extern int __pm_runtime_get(struct device *dev, bool sync);
  26 extern int __pm_runtime_put(struct device *dev, bool sync);
  27 extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
  28 extern int pm_runtime_barrier(struct device *dev);
  29 extern void pm_runtime_enable(struct device *dev);
  30 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
  31
  32 static inline bool pm_children_suspended(struct device *dev)
  33 {
  34         return dev->power.ignore_children
  35                 || !atomic_read(&dev->power.child_count);
  36 }
  37
  38 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
  39 {
  40         dev->power.ignore_children = enable;
  41 }
  42
  43 static inline void pm_runtime_get_noresume(struct device *dev)
  44 {
  45         atomic_inc(&dev->power.usage_count);
  46 }
  47
  48 static 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
  55 static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
  56 static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; }
  57 static inline int pm_runtime_resume(struct device *dev) { return 0; }
  58 static inline int pm_request_idle(struct device *dev) { return -ENOSYS; }
  59 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
  60 {
  61         return -ENOSYS;
  62 }
  63 static inline int pm_request_resume(struct device *dev) { return 0; }
  64 static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; }
  65 static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; }
  66 static inline int __pm_runtime_set_status(struct device *dev,
  67                                             unsigned int status) { return 0; }
  68 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
  69 static inline void pm_runtime_enable(struct device *dev) {}
  70 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
  71
  72 static inline bool pm_children_suspended(struct device *dev) { return false; }
  73 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
  74 static inline void pm_runtime_get_noresume(struct device *dev) {}
  75 static inline void pm_runtime_put_noidle(struct device *dev) {}
  76
  77 #endif /* !CONFIG_PM_RUNTIME */
  78
  79 static inline int pm_runtime_get(struct device *dev)
  80 {
  81         return __pm_runtime_get(dev, false);
  82 }
  83
  84 static inline int pm_runtime_get_sync(struct device *dev)
  85 {
  86         return __pm_runtime_get(dev, true);
  87 }
  88
  89 static inline int pm_runtime_put(struct device *dev)
  90 {
  91         return __pm_runtime_put(dev, false);
  92 }
  93
  94 static inline int pm_runtime_put_sync(struct device *dev)
  95 {
  96         return __pm_runtime_put(dev, true);
  97 }
  98
  99 static inline int pm_runtime_set_active(struct device *dev)
 100 {
 101         return __pm_runtime_set_status(dev, RPM_ACTIVE);
 102 }
 103
 104 static inline void pm_runtime_set_suspended(struct device *dev)
 105 {
 106         __pm_runtime_set_status(dev, RPM_SUSPENDED);
 107 }
 108
 109 static inline void pm_runtime_disable(struct device *dev)
 110 {
 111         __pm_runtime_disable(dev, true);
 112 }
 113
 114 #endif