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.
9 #ifndef _LINUX_PM_RUNTIME_H
10 #define _LINUX_PM_RUNTIME_H
12 #include <linux/device.h>
15 /* Runtime PM flag argument bits */
16 #define RPM_ASYNC 0x01 /* Request is asynchronous */
17 #define RPM_NOWAIT 0x02 /* Don't wait for concurrent
20 #ifdef CONFIG_PM_RUNTIME
22 extern struct workqueue_struct *pm_wq;
24 extern int pm_runtime_idle(struct device *dev);
25 extern int pm_runtime_suspend(struct device *dev);
26 extern int pm_runtime_resume(struct device *dev);
27 extern int pm_request_idle(struct device *dev);
28 extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
29 extern int pm_request_resume(struct device *dev);
30 extern int __pm_runtime_get(struct device *dev, int rpmflags);
31 extern int __pm_runtime_put(struct device *dev, int rpmflags);
32 extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
33 extern int pm_runtime_barrier(struct device *dev);
34 extern void pm_runtime_enable(struct device *dev);
35 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
36 extern void pm_runtime_allow(struct device *dev);
37 extern void pm_runtime_forbid(struct device *dev);
38 extern int pm_generic_runtime_idle(struct device *dev);
39 extern int pm_generic_runtime_suspend(struct device *dev);
40 extern int pm_generic_runtime_resume(struct device *dev);
42 static inline bool pm_children_suspended(struct device *dev)
44 return dev->power.ignore_children
45 || !atomic_read(&dev->power.child_count);
48 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
50 dev->power.ignore_children = enable;
53 static inline void pm_runtime_get_noresume(struct device *dev)
55 atomic_inc(&dev->power.usage_count);
58 static inline void pm_runtime_put_noidle(struct device *dev)
60 atomic_add_unless(&dev->power.usage_count, -1, 0);
63 static inline bool device_run_wake(struct device *dev)
65 return dev->power.run_wake;
68 static inline void device_set_run_wake(struct device *dev, bool enable)
70 dev->power.run_wake = enable;
73 static inline bool pm_runtime_suspended(struct device *dev)
75 return dev->power.runtime_status == RPM_SUSPENDED;
78 #else /* !CONFIG_PM_RUNTIME */
80 static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; }
81 static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; }
82 static inline int pm_runtime_resume(struct device *dev) { return 0; }
83 static inline int pm_request_idle(struct device *dev) { return -ENOSYS; }
84 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
88 static inline int pm_request_resume(struct device *dev) { return 0; }
89 static inline int __pm_runtime_get(struct device *dev, int rpmflags)
91 static inline int __pm_runtime_put(struct device *dev, int rpmflags)
93 static inline int __pm_runtime_set_status(struct device *dev,
94 unsigned int status) { return 0; }
95 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
96 static inline void pm_runtime_enable(struct device *dev) {}
97 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
98 static inline void pm_runtime_allow(struct device *dev) {}
99 static inline void pm_runtime_forbid(struct device *dev) {}
101 static inline bool pm_children_suspended(struct device *dev) { return false; }
102 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
103 static inline void pm_runtime_get_noresume(struct device *dev) {}
104 static inline void pm_runtime_put_noidle(struct device *dev) {}
105 static inline bool device_run_wake(struct device *dev) { return false; }
106 static inline void device_set_run_wake(struct device *dev, bool enable) {}
107 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
109 static inline int pm_generic_runtime_idle(struct device *dev) { return 0; }
110 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
111 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
113 #endif /* !CONFIG_PM_RUNTIME */
115 static inline int pm_runtime_get(struct device *dev)
117 return __pm_runtime_get(dev, RPM_ASYNC);
120 static inline int pm_runtime_get_sync(struct device *dev)
122 return __pm_runtime_get(dev, 0);
125 static inline int pm_runtime_put(struct device *dev)
127 return __pm_runtime_put(dev, RPM_ASYNC);
130 static inline int pm_runtime_put_sync(struct device *dev)
132 return __pm_runtime_put(dev, 0);
135 static inline int pm_runtime_set_active(struct device *dev)
137 return __pm_runtime_set_status(dev, RPM_ACTIVE);
140 static inline void pm_runtime_set_suspended(struct device *dev)
142 __pm_runtime_set_status(dev, RPM_SUSPENDED);
145 static inline void pm_runtime_disable(struct device *dev)
147 __pm_runtime_disable(dev, true);