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 static inline bool device_run_wake(struct device *dev)
  54 {
  55         return dev->power.run_wake;
  56 }
  57
  58 static inline void device_set_run_wake(struct device *dev, bool enable)
  59 {
  60         dev->power.run_wake = enable;
  61 }
  62
  63 #else /* !CONFIG_PM_RUNTIME */
  64
  65 static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
  66 static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; }
  67 static inline int pm_runtime_resume(struct device *dev) { return 0; }
  68 static inline int pm_request_idle(struct device *dev) { return -ENOSYS; }
  69 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
  70 {
  71         return -ENOSYS;
  72 }
  73 static inline int pm_request_resume(struct device *dev) { return 0; }
  74 static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; }
  75 static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; }
  76 static inline int __pm_runtime_set_status(struct device *dev,
  77                                             unsigned int status) { return 0; }
  78 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
  79 static inline void pm_runtime_enable(struct device *dev) {}
  80 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
  81
  82 static inline bool pm_children_suspended(struct device *dev) { return false; }
  83 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
  84 static inline void pm_runtime_get_noresume(struct device *dev) {}
  85 static inline void pm_runtime_put_noidle(struct device *dev) {}
  86 static inline bool device_run_wake(struct device *dev) { return false; }
  87 static inline void device_set_run_wake(struct device *dev, bool enable) {}
  88
  89 #endif /* !CONFIG_PM_RUNTIME */
  90
  91 static inline int pm_runtime_get(struct device *dev)
  92 {
  93         return __pm_runtime_get(dev, false);
  94 }
  95
  96 static inline int pm_runtime_get_sync(struct device *dev)
  97 {
  98         return __pm_runtime_get(dev, true);
  99 }
 100
 101 static inline int pm_runtime_put(struct device *dev)
 102 {
 103         return __pm_runtime_put(dev, false);
 104 }
 105
 106 static inline int pm_runtime_put_sync(struct device *dev)
 107 {
 108         return __pm_runtime_put(dev, true);
 109 }
 110
 111 static inline int pm_runtime_set_active(struct device *dev)
 112 {
 113         return __pm_runtime_set_status(dev, RPM_ACTIVE);
 114 }
 115
 116 static inline void pm_runtime_set_suspended(struct device *dev)
 117 {
 118         __pm_runtime_set_status(dev, RPM_SUSPENDED);
 119 }
 120
 121 static inline void pm_runtime_disable(struct device *dev)
 122 {
 123         __pm_runtime_disable(dev, true);
 124 }
 125
 126 #endif