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 #else /* !CONFIG_PM_RUNTIME */ 54 55 static inline int pm_runtime_idle(struct device *dev) { return -ENOSYS; } 56 static inline int pm_runtime_suspend(struct device *dev) { return -ENOSYS; } 57 static inline int pm_runtime_resume(struct device *dev) { return 0; } 58 static inline int pm_request_idle(struct device *dev) { return -ENOSYS; } 59 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 60 { 61 return -ENOSYS; 62 } 63 static inline int pm_request_resume(struct device *dev) { return 0; } 64 static inline int __pm_runtime_get(struct device *dev, bool sync) { return 1; } 65 static inline int __pm_runtime_put(struct device *dev, bool sync) { return 0; } 66 static inline int __pm_runtime_set_status(struct device *dev, 67 unsigned int status) { return 0; } 68 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 69 static inline void pm_runtime_enable(struct device *dev) {} 70 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 71 72 static inline bool pm_children_suspended(struct device *dev) { return false; } 73 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {} 74 static inline void pm_runtime_get_noresume(struct device *dev) {} 75 static inline void pm_runtime_put_noidle(struct device *dev) {} 76 77 #endif /* !CONFIG_PM_RUNTIME */ 78 79 static inline int pm_runtime_get(struct device *dev) 80 { 81 return __pm_runtime_get(dev, false); 82 } 83 84 static inline int pm_runtime_get_sync(struct device *dev) 85 { 86 return __pm_runtime_get(dev, true); 87 } 88 89 static inline int pm_runtime_put(struct device *dev) 90 { 91 return __pm_runtime_put(dev, false); 92 } 93 94 static inline int pm_runtime_put_sync(struct device *dev) 95 { 96 return __pm_runtime_put(dev, true); 97 } 98 99 static inline int pm_runtime_set_active(struct device *dev) 100 { 101 return __pm_runtime_set_status(dev, RPM_ACTIVE); 102 } 103 104 static inline void pm_runtime_set_suspended(struct device *dev) 105 { 106 __pm_runtime_set_status(dev, RPM_SUSPENDED); 107 } 108 109 static inline void pm_runtime_disable(struct device *dev) 110 { 111 __pm_runtime_disable(dev, true); 112 } 113 114 #endif 115