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 32 static inline bool pm_children_suspended(struct device *dev) 33 { 34 return dev->power.ignore_children 35 || !atomic_read(&dev->power.child_count); 36 } 37 38 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) 39 { 40 dev->power.ignore_children = enable; 41 } 42 43 static inline void pm_runtime_get_noresume(struct device *dev) 44 { 45 atomic_inc(&dev->power.usage_count); 46 } 47 48 static inline void pm_runtime_put_noidle(struct device *dev) 49 { 50 atomic_add_unless(&dev->power.usage_count, -1, 0); 51 } 52 53 static inline bool device_run_wake(struct device *dev) 54 { 55 return dev->power.run_wake; 56 } 57 58 static inline void device_set_run_wake(struct device *dev, bool enable) 59 { 60 dev->power.run_wake = enable; 61 } 62 63 #else /* !CONFIG_PM_RUNTIME */ 64 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) 70 { 71 return -ENOSYS; 72 } 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) {} 81 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) {} 88 89 #endif /* !CONFIG_PM_RUNTIME */ 90 91 static inline int pm_runtime_get(struct device *dev) 92 { 93 return __pm_runtime_get(dev, false); 94 } 95 96 static inline int pm_runtime_get_sync(struct device *dev) 97 { 98 return __pm_runtime_get(dev, true); 99 } 100 101 static inline int pm_runtime_put(struct device *dev) 102 { 103 return __pm_runtime_put(dev, false); 104 } 105 106 static inline int pm_runtime_put_sync(struct device *dev) 107 { 108 return __pm_runtime_put(dev, true); 109 } 110 111 static inline int pm_runtime_set_active(struct device *dev) 112 { 113 return __pm_runtime_set_status(dev, RPM_ACTIVE); 114 } 115 116 static inline void pm_runtime_set_suspended(struct device *dev) 117 { 118 __pm_runtime_set_status(dev, RPM_SUSPENDED); 119 } 120 121 static inline void pm_runtime_disable(struct device *dev) 122 { 123 __pm_runtime_disable(dev, true); 124 } 125 126 #endif 127