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 #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
);
31 extern void pm_runtime_allow(struct device
*dev
);
32 extern void pm_runtime_forbid(struct device
*dev
);
34 static inline bool pm_children_suspended(struct device
*dev
)
36 return dev
->power
.ignore_children
37 || !atomic_read(&dev
->power
.child_count
);
40 static inline void pm_suspend_ignore_children(struct device
*dev
, bool enable
)
42 dev
->power
.ignore_children
= enable
;
45 static inline void pm_runtime_get_noresume(struct device
*dev
)
47 atomic_inc(&dev
->power
.usage_count
);
50 static inline void pm_runtime_put_noidle(struct device
*dev
)
52 atomic_add_unless(&dev
->power
.usage_count
, -1, 0);
55 static inline bool device_run_wake(struct device
*dev
)
57 return dev
->power
.run_wake
;
60 static inline void device_set_run_wake(struct device
*dev
, bool enable
)
62 dev
->power
.run_wake
= enable
;
65 #else /* !CONFIG_PM_RUNTIME */
67 static inline int pm_runtime_idle(struct device
*dev
) { return -ENOSYS
; }
68 static inline int pm_runtime_suspend(struct device
*dev
) { return -ENOSYS
; }
69 static inline int pm_runtime_resume(struct device
*dev
) { return 0; }
70 static inline int pm_request_idle(struct device
*dev
) { return -ENOSYS
; }
71 static inline int pm_schedule_suspend(struct device
*dev
, unsigned int delay
)
75 static inline int pm_request_resume(struct device
*dev
) { return 0; }
76 static inline int __pm_runtime_get(struct device
*dev
, bool sync
) { return 1; }
77 static inline int __pm_runtime_put(struct device
*dev
, bool sync
) { return 0; }
78 static inline int __pm_runtime_set_status(struct device
*dev
,
79 unsigned int status
) { return 0; }
80 static inline int pm_runtime_barrier(struct device
*dev
) { return 0; }
81 static inline void pm_runtime_enable(struct device
*dev
) {}
82 static inline void __pm_runtime_disable(struct device
*dev
, bool c
) {}
83 static inline void pm_runtime_allow(struct device
*dev
) {}
84 static inline void pm_runtime_forbid(struct device
*dev
) {}
86 static inline bool pm_children_suspended(struct device
*dev
) { return false; }
87 static inline void pm_suspend_ignore_children(struct device
*dev
, bool en
) {}
88 static inline void pm_runtime_get_noresume(struct device
*dev
) {}
89 static inline void pm_runtime_put_noidle(struct device
*dev
) {}
90 static inline bool device_run_wake(struct device
*dev
) { return false; }
91 static inline void device_set_run_wake(struct device
*dev
, bool enable
) {}
93 #endif /* !CONFIG_PM_RUNTIME */
95 static inline int pm_runtime_get(struct device
*dev
)
97 return __pm_runtime_get(dev
, false);
100 static inline int pm_runtime_get_sync(struct device
*dev
)
102 return __pm_runtime_get(dev
, true);
105 static inline int pm_runtime_put(struct device
*dev
)
107 return __pm_runtime_put(dev
, false);
110 static inline int pm_runtime_put_sync(struct device
*dev
)
112 return __pm_runtime_put(dev
, true);
115 static inline int pm_runtime_set_active(struct device
*dev
)
117 return __pm_runtime_set_status(dev
, RPM_ACTIVE
);
120 static inline void pm_runtime_set_suspended(struct device
*dev
)
122 __pm_runtime_set_status(dev
, RPM_SUSPENDED
);
125 static inline void pm_runtime_disable(struct device
*dev
)
127 __pm_runtime_disable(dev
, true);
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