Linux 2.6.33-rc2
[pohmelfs.git] / include / linux / pm_runtime.h
blob370ce0a6fe4a8702f9c4f25de37f49c217dfd158
1 /*
2 * pm_runtime.h - Device run-time power management helper functions.
4 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
6 * This file is released under the GPLv2.
7 */
9 #ifndef _LINUX_PM_RUNTIME_H
10 #define _LINUX_PM_RUNTIME_H
12 #include <linux/device.h>
13 #include <linux/pm.h>
15 #ifdef CONFIG_PM_RUNTIME
17 extern struct workqueue_struct *pm_wq;
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);
32 static inline bool pm_children_suspended(struct device *dev)
34 return dev->power.ignore_children
35 || !atomic_read(&dev->power.child_count);
38 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
40 dev->power.ignore_children = enable;
43 static inline void pm_runtime_get_noresume(struct device *dev)
45 atomic_inc(&dev->power.usage_count);
48 static inline void pm_runtime_put_noidle(struct device *dev)
50 atomic_add_unless(&dev->power.usage_count, -1, 0);
53 static inline bool device_run_wake(struct device *dev)
55 return dev->power.run_wake;
58 static inline void device_set_run_wake(struct device *dev, bool enable)
60 dev->power.run_wake = enable;
63 #else /* !CONFIG_PM_RUNTIME */
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)
71 return -ENOSYS;
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) {}
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) {}
89 #endif /* !CONFIG_PM_RUNTIME */
91 static inline int pm_runtime_get(struct device *dev)
93 return __pm_runtime_get(dev, false);
96 static inline int pm_runtime_get_sync(struct device *dev)
98 return __pm_runtime_get(dev, true);
101 static inline int pm_runtime_put(struct device *dev)
103 return __pm_runtime_put(dev, false);
106 static inline int pm_runtime_put_sync(struct device *dev)
108 return __pm_runtime_put(dev, true);
111 static inline int pm_runtime_set_active(struct device *dev)
113 return __pm_runtime_set_status(dev, RPM_ACTIVE);
116 static inline void pm_runtime_set_suspended(struct device *dev)
118 __pm_runtime_set_status(dev, RPM_SUSPENDED);
121 static inline void pm_runtime_disable(struct device *dev)
123 __pm_runtime_disable(dev, true);
126 #endif