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 extern int pm_generic_runtime_idle(struct device *dev); 34 extern int pm_generic_runtime_suspend(struct device *dev); 35 extern int pm_generic_runtime_resume(struct device *dev); 36 37 static inline bool pm_children_suspended(struct device *dev) 38 { 39 return dev->power.ignore_children 40 || !atomic_read(&dev->power.child_count); 41 } 42 43 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) 44 { 45 dev->power.ignore_children = enable; 46 } 47 48 static inline void pm_runtime_get_noresume(struct device *dev) 49 { 50 atomic_inc(&dev->power.usage_count); 51 } 52 53 static inline void pm_runtime_put_noidle(struct device *dev) 54 { 55 atomic_add_unless(&dev->power.usage_count, -1, 0); 56 } 57 58 static inline bool device_run_wake(struct device *dev) 59 { 60 return dev->power.run_wake; 61 } 62 63 static inline void device_set_run_wake(struct device *dev, bool enable) 64 { 65 dev->power.run_wake = enable; 66 } 67 68 static inline bool pm_runtime_suspended(struct device *dev) 69 { 70 return dev->power.runtime_status == RPM_SUSPENDED; 71 } 72 73 #else /* !CONFIG_PM_RUNTIME */ 74 75 static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; } 76 static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; } 77 static inline int pm_runtime_resume(struct device *dev) { return 0; } 78 static inline int pm_request_idle(struct device *dev) { return -ENOSYS; } 79 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 80 { 81 return -ENOSYS; 82 } 83 static inline int pm_request_resume(struct device *dev) { return 0; } 84 static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; } 85 static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; } 86 static inline int __pm_runtime_set_status(struct device *dev, 87 unsigned int status) { return 0; } 88 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 89 static inline void pm_runtime_enable(struct device *dev) {} 90 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 91 static inline void pm_runtime_allow(struct device *dev) {} 92 static inline void pm_runtime_forbid(struct device *dev) {} 93 94 static inline bool pm_children_suspended(struct device *dev) { return false; } 95 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {} 96 static inline void pm_runtime_get_noresume(struct device *dev) {} 97 static inline void pm_runtime_put_noidle(struct device *dev) {} 98 static inline bool device_run_wake(struct device *dev) { return false; } 99 static inline void device_set_run_wake(struct device *dev, bool enable) {} 100 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 101 102 static inline int pm_generic_runtime_idle(struct device *dev) { return 0; } 103 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 104 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 105 106 #endif /* !CONFIG_PM_RUNTIME */ 107 108 static inline int pm_runtime_get(struct device *dev) 109 { 110 return __pm_runtime_get(dev, false); 111 } 112 113 static inline int pm_runtime_get_sync(struct device *dev) 114 { 115 return __pm_runtime_get(dev, true); 116 } 117 118 static inline int pm_runtime_put(struct device *dev) 119 { 120 return __pm_runtime_put(dev, false); 121 } 122 123 static inline int pm_runtime_put_sync(struct device *dev) 124 { 125 return __pm_runtime_put(dev, true); 126 } 127 128 static inline int pm_runtime_set_active(struct device *dev) 129 { 130 return __pm_runtime_set_status(dev, RPM_ACTIVE); 131 } 132 133 static inline void pm_runtime_set_suspended(struct device *dev) 134 { 135 __pm_runtime_set_status(dev, RPM_SUSPENDED); 136 } 137 138 static inline void pm_runtime_disable(struct device *dev) 139 { 140 __pm_runtime_disable(dev, true); 141 } 142 143 #endif 144