1 /* 2 * pm_runtime.h - Device run-time power management helper functions. 3 * 4 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl> 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 #include <linux/jiffies.h> 16 17 /* Runtime PM flag argument bits */ 18 #define RPM_ASYNC 0x01 /* Request is asynchronous */ 19 #define RPM_NOWAIT 0x02 /* Don't wait for concurrent 20 state change */ 21 #define RPM_GET_PUT 0x04 /* Increment/decrement the 22 usage_count */ 23 #define RPM_AUTO 0x08 /* Use autosuspend_delay */ 24 25 #ifdef CONFIG_PM_RUNTIME 26 27 extern struct workqueue_struct *pm_wq; 28 29 extern int __pm_runtime_idle(struct device *dev, int rpmflags); 30 extern int __pm_runtime_suspend(struct device *dev, int rpmflags); 31 extern int __pm_runtime_resume(struct device *dev, int rpmflags); 32 extern int pm_schedule_suspend(struct device *dev, unsigned int delay); 33 extern int __pm_runtime_set_status(struct device *dev, unsigned int status); 34 extern int pm_runtime_barrier(struct device *dev); 35 extern void pm_runtime_enable(struct device *dev); 36 extern void __pm_runtime_disable(struct device *dev, bool check_resume); 37 extern void pm_runtime_allow(struct device *dev); 38 extern void pm_runtime_forbid(struct device *dev); 39 extern int pm_generic_runtime_idle(struct device *dev); 40 extern int pm_generic_runtime_suspend(struct device *dev); 41 extern int pm_generic_runtime_resume(struct device *dev); 42 extern void pm_runtime_no_callbacks(struct device *dev); 43 extern void pm_runtime_irq_safe(struct device *dev); 44 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use); 45 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); 46 extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev); 47 48 static inline bool pm_children_suspended(struct device *dev) 49 { 50 return dev->power.ignore_children 51 || !atomic_read(&dev->power.child_count); 52 } 53 54 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) 55 { 56 dev->power.ignore_children = enable; 57 } 58 59 static inline void pm_runtime_get_noresume(struct device *dev) 60 { 61 atomic_inc(&dev->power.usage_count); 62 } 63 64 static inline void pm_runtime_put_noidle(struct device *dev) 65 { 66 atomic_add_unless(&dev->power.usage_count, -1, 0); 67 } 68 69 static inline bool device_run_wake(struct device *dev) 70 { 71 return dev->power.run_wake; 72 } 73 74 static inline void device_set_run_wake(struct device *dev, bool enable) 75 { 76 dev->power.run_wake = enable; 77 } 78 79 static inline bool pm_runtime_suspended(struct device *dev) 80 { 81 return dev->power.runtime_status == RPM_SUSPENDED 82 && !dev->power.disable_depth; 83 } 84 85 static inline bool pm_runtime_enabled(struct device *dev) 86 { 87 return !dev->power.disable_depth; 88 } 89 90 static inline void pm_runtime_mark_last_busy(struct device *dev) 91 { 92 ACCESS_ONCE(dev->power.last_busy) = jiffies; 93 } 94 95 #else /* !CONFIG_PM_RUNTIME */ 96 97 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 98 { 99 return -ENOSYS; 100 } 101 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 102 { 103 return -ENOSYS; 104 } 105 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 106 { 107 return 1; 108 } 109 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 110 { 111 return -ENOSYS; 112 } 113 static inline int __pm_runtime_set_status(struct device *dev, 114 unsigned int status) { return 0; } 115 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 116 static inline void pm_runtime_enable(struct device *dev) {} 117 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 118 static inline void pm_runtime_allow(struct device *dev) {} 119 static inline void pm_runtime_forbid(struct device *dev) {} 120 121 static inline bool pm_children_suspended(struct device *dev) { return false; } 122 static inline void pm_suspend_ignore_children(struct device *dev, bool en) {} 123 static inline void pm_runtime_get_noresume(struct device *dev) {} 124 static inline void pm_runtime_put_noidle(struct device *dev) {} 125 static inline bool device_run_wake(struct device *dev) { return false; } 126 static inline void device_set_run_wake(struct device *dev, bool enable) {} 127 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 128 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 129 130 static inline int pm_generic_runtime_idle(struct device *dev) { return 0; } 131 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 132 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 133 static inline void pm_runtime_no_callbacks(struct device *dev) {} 134 static inline void pm_runtime_irq_safe(struct device *dev) {} 135 136 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 137 static inline void __pm_runtime_use_autosuspend(struct device *dev, 138 bool use) {} 139 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 140 int delay) {} 141 static inline unsigned long pm_runtime_autosuspend_expiration( 142 struct device *dev) { return 0; } 143 144 #endif /* !CONFIG_PM_RUNTIME */ 145 146 static inline int pm_runtime_idle(struct device *dev) 147 { 148 return __pm_runtime_idle(dev, 0); 149 } 150 151 static inline int pm_runtime_suspend(struct device *dev) 152 { 153 return __pm_runtime_suspend(dev, 0); 154 } 155 156 static inline int pm_runtime_autosuspend(struct device *dev) 157 { 158 return __pm_runtime_suspend(dev, RPM_AUTO); 159 } 160 161 static inline int pm_runtime_resume(struct device *dev) 162 { 163 return __pm_runtime_resume(dev, 0); 164 } 165 166 static inline int pm_request_idle(struct device *dev) 167 { 168 return __pm_runtime_idle(dev, RPM_ASYNC); 169 } 170 171 static inline int pm_request_resume(struct device *dev) 172 { 173 return __pm_runtime_resume(dev, RPM_ASYNC); 174 } 175 176 static inline int pm_request_autosuspend(struct device *dev) 177 { 178 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 179 } 180 181 static inline int pm_runtime_get(struct device *dev) 182 { 183 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 184 } 185 186 static inline int pm_runtime_get_sync(struct device *dev) 187 { 188 return __pm_runtime_resume(dev, RPM_GET_PUT); 189 } 190 191 static inline int pm_runtime_put(struct device *dev) 192 { 193 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 194 } 195 196 static inline int pm_runtime_put_autosuspend(struct device *dev) 197 { 198 return __pm_runtime_suspend(dev, 199 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 200 } 201 202 static inline int pm_runtime_put_sync(struct device *dev) 203 { 204 return __pm_runtime_idle(dev, RPM_GET_PUT); 205 } 206 207 static inline int pm_runtime_put_sync_suspend(struct device *dev) 208 { 209 return __pm_runtime_suspend(dev, RPM_GET_PUT); 210 } 211 212 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 213 { 214 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 215 } 216 217 static inline int pm_runtime_set_active(struct device *dev) 218 { 219 return __pm_runtime_set_status(dev, RPM_ACTIVE); 220 } 221 222 static inline void pm_runtime_set_suspended(struct device *dev) 223 { 224 __pm_runtime_set_status(dev, RPM_SUSPENDED); 225 } 226 227 static inline void pm_runtime_disable(struct device *dev) 228 { 229 __pm_runtime_disable(dev, true); 230 } 231 232 static inline void pm_runtime_use_autosuspend(struct device *dev) 233 { 234 __pm_runtime_use_autosuspend(dev, true); 235 } 236 237 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 238 { 239 __pm_runtime_use_autosuspend(dev, false); 240 } 241 242 #endif 243