1 /* 2 * pm_runtime.h - Device run-time power management helper functions. 3 * 4 * Copyright (C) 2009 Rafael J. Wysocki <[email protected]> 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 34 static inline bool pm_children_suspended(struct device *dev) 35 { 36 return dev->power.ignore_children 37 || !atomic_read(&dev->power.child_count); 38 } 39 40 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) 41 { 42 dev->power.ignore_children = enable; 43 } 44 45 static inline void pm_runtime_get_noresume(struct device *dev) 46 { 47 atomic_inc(&dev->power.usage_count); 48 } 49 50 static inline void pm_runtime_put_noidle(struct device *dev) 51 { 52 atomic_add_unless(&dev->power.usage_count, -1, 0); 53 } 54 55 static inline bool device_run_wake(struct device *dev) 56 { 57 return dev->power.run_wake; 58 } 59 60 static inline void device_set_run_wake(struct device *dev, bool enable) 61 { 62 dev->power.run_wake = enable; 63 } 64 65 #else /* !CONFIG_PM_RUNTIME */ 66 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) 72 { 73 return -ENOSYS; 74 } 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) {} 85 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) {} 92 93 #endif /* !CONFIG_PM_RUNTIME */ 94 95 static inline int pm_runtime_get(struct device *dev) 96 { 97 return __pm_runtime_get(dev, false); 98 } 99 100 static inline int pm_runtime_get_sync(struct device *dev) 101 { 102 return __pm_runtime_get(dev, true); 103 } 104 105 static inline int pm_runtime_put(struct device *dev) 106 { 107 return __pm_runtime_put(dev, false); 108 } 109 110 static inline int pm_runtime_put_sync(struct device *dev) 111 { 112 return __pm_runtime_put(dev, true); 113 } 114 115 static inline int pm_runtime_set_active(struct device *dev) 116 { 117 return __pm_runtime_set_status(dev, RPM_ACTIVE); 118 } 119 120 static inline void pm_runtime_set_suspended(struct device *dev) 121 { 122 __pm_runtime_set_status(dev, RPM_SUSPENDED); 123 } 124 125 static inline void pm_runtime_disable(struct device *dev) 126 { 127 __pm_runtime_disable(dev, true); 128 } 129 130 #endif 131