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 extern void pm_runtime_allow(struct device *dev);
  32 extern void pm_runtime_forbid(struct device *dev);
  33 extern int pm_generic_runtime_idle(struct device *dev);
  34 extern int pm_generic_runtime_suspend(struct device *dev);
  35 extern int pm_generic_runtime_resume(struct device *dev);
  36
  37 static inline bool pm_children_suspended(struct device *dev)
  38 {
  39         return dev->power.ignore_children
  40                 || !atomic_read(&dev->power.child_count);
  41 }
  42
  43 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
  44 {
  45         dev->power.ignore_children = enable;
  46 }
  47
  48 static inline void pm_runtime_get_noresume(struct device *dev)
  49 {
  50         atomic_inc(&dev->power.usage_count);
  51 }
  52
  53 static inline void pm_runtime_put_noidle(struct device *dev)
  54 {
  55         atomic_add_unless(&dev->power.usage_count, -1, 0);
  56 }
  57
  58 static inline bool device_run_wake(struct device *dev)
  59 {
  60         return dev->power.run_wake;
  61 }
  62
  63 static inline void device_set_run_wake(struct device *dev, bool enable)
  64 {
  65         dev->power.run_wake = enable;
  66 }
  67
  68 static inline bool pm_runtime_suspended(struct device *dev)
  69 {
  70         return dev->power.runtime_status == RPM_SUSPENDED;
  71 }
  72
  73 #else /* !CONFIG_PM_RUNTIME */
  74
  75 static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
  76 static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; }
  77 static inline int pm_runtime_resume(struct device *dev) { return 0; }
  78 static inline int pm_request_idle(struct device *dev) { return -ENOSYS; }
  79 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
  80 {
  81         return -ENOSYS;
  82 }
  83 static inline int pm_request_resume(struct device *dev) { return 0; }
  84 static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; }
  85 static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; }
  86 static inline int __pm_runtime_set_status(struct device *dev,
  87                                             unsigned int status) { return 0; }
  88 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
  89 static inline void pm_runtime_enable(struct device *dev) {}
  90 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
  91 static inline void pm_runtime_allow(struct device *dev) {}
  92 static inline void pm_runtime_forbid(struct device *dev) {}
  93
  94 static inline bool pm_children_suspended(struct device *dev) { return false; }
  95 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
  96 static inline void pm_runtime_get_noresume(struct device *dev) {}
  97 static inline void pm_runtime_put_noidle(struct device *dev) {}
  98 static inline bool device_run_wake(struct device *dev) { return false; }
  99 static inline void device_set_run_wake(struct device *dev, bool enable) {}
 100 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
 101
 102 static inline int pm_generic_runtime_idle(struct device *dev) { return 0; }
 103 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
 104 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
 105
 106 #endif /* !CONFIG_PM_RUNTIME */
 107
 108 static inline int pm_runtime_get(struct device *dev)
 109 {
 110         return __pm_runtime_get(dev, false);
 111 }
 112
 113 static inline int pm_runtime_get_sync(struct device *dev)
 114 {
 115         return __pm_runtime_get(dev, true);
 116 }
 117
 118 static inline int pm_runtime_put(struct device *dev)
 119 {
 120         return __pm_runtime_put(dev, false);
 121 }
 122
 123 static inline int pm_runtime_put_sync(struct device *dev)
 124 {
 125         return __pm_runtime_put(dev, true);
 126 }
 127
 128 static inline int pm_runtime_set_active(struct device *dev)
 129 {
 130         return __pm_runtime_set_status(dev, RPM_ACTIVE);
 131 }
 132
 133 static inline void pm_runtime_set_suspended(struct device *dev)
 134 {
 135         __pm_runtime_set_status(dev, RPM_SUSPENDED);
 136 }
 137
 138 static inline void pm_runtime_disable(struct device *dev)
 139 {
 140         __pm_runtime_disable(dev, true);
 141 }
 142
 143 #endif