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/notifier.h> 14 #include <linux/pm.h> 15 16 #include <linux/jiffies.h> 17 18 /* Runtime PM flag argument bits */ 19 #define RPM_ASYNC 0x01 /* Request is asynchronous */ 20 #define RPM_NOWAIT 0x02 /* Don't wait for concurrent 21 state change */ 22 #define RPM_GET_PUT 0x04 /* Increment/decrement the 23 usage_count */ 24 #define RPM_AUTO 0x08 /* Use autosuspend_delay */ 25 26 #ifdef CONFIG_PM_RUNTIME 27 28 extern struct workqueue_struct *pm_wq; 29 30 extern int __pm_runtime_idle(struct device *dev, int rpmflags); 31 extern int __pm_runtime_suspend(struct device *dev, int rpmflags); 32 extern int __pm_runtime_resume(struct device *dev, int rpmflags); 33 extern int pm_schedule_suspend(struct device *dev, unsigned int delay); 34 extern int __pm_runtime_set_status(struct device *dev, unsigned int status); 35 extern int pm_runtime_barrier(struct device *dev); 36 extern void pm_runtime_enable(struct device *dev); 37 extern void __pm_runtime_disable(struct device *dev, bool check_resume); 38 extern void pm_runtime_allow(struct device *dev); 39 extern void pm_runtime_forbid(struct device *dev); 40 extern int pm_generic_runtime_idle(struct device *dev); 41 extern int pm_generic_runtime_suspend(struct device *dev); 42 extern int pm_generic_runtime_resume(struct device *dev); 43 extern void pm_runtime_no_callbacks(struct device *dev); 44 extern void pm_runtime_irq_safe(struct device *dev); 45 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use); 46 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); 47 extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev); 48 49 static inline bool pm_children_suspended(struct device *dev) 50 { 51 return dev->power.ignore_children 52 || !atomic_read(&dev->power.child_count); 53 } 54 55 static inline void pm_runtime_get_noresume(struct device *dev) 56 { 57 atomic_inc(&dev->power.usage_count); 58 } 59 60 static inline void pm_runtime_put_noidle(struct device *dev) 61 { 62 atomic_add_unless(&dev->power.usage_count, -1, 0); 63 } 64 65 static inline bool device_run_wake(struct device *dev) 66 { 67 return dev->power.run_wake; 68 } 69 70 static inline void device_set_run_wake(struct device *dev, bool enable) 71 { 72 dev->power.run_wake = enable; 73 } 74 75 static inline bool pm_runtime_suspended(struct device *dev) 76 { 77 return dev->power.runtime_status == RPM_SUSPENDED 78 && !dev->power.disable_depth; 79 } 80 81 static inline bool pm_runtime_status_suspended(struct device *dev) 82 { 83 return dev->power.runtime_status == RPM_SUSPENDED; 84 } 85 86 static inline bool pm_runtime_enabled(struct device *dev) 87 { 88 return !dev->power.disable_depth; 89 } 90 91 static inline bool pm_runtime_callbacks_present(struct device *dev) 92 { 93 return !dev->power.no_callbacks; 94 } 95 96 static inline void pm_runtime_mark_last_busy(struct device *dev) 97 { 98 ACCESS_ONCE(dev->power.last_busy) = jiffies; 99 } 100 101 #else /* !CONFIG_PM_RUNTIME */ 102 103 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 104 { 105 return -ENOSYS; 106 } 107 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 108 { 109 return -ENOSYS; 110 } 111 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 112 { 113 return 1; 114 } 115 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 116 { 117 return -ENOSYS; 118 } 119 static inline int __pm_runtime_set_status(struct device *dev, 120 unsigned int status) { return 0; } 121 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 122 static inline void pm_runtime_enable(struct device *dev) {} 123 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 124 static inline void pm_runtime_allow(struct device *dev) {} 125 static inline void pm_runtime_forbid(struct device *dev) {} 126 127 static inline bool pm_children_suspended(struct device *dev) { return false; } 128 static inline void pm_runtime_get_noresume(struct device *dev) {} 129 static inline void pm_runtime_put_noidle(struct device *dev) {} 130 static inline bool device_run_wake(struct device *dev) { return false; } 131 static inline void device_set_run_wake(struct device *dev, bool enable) {} 132 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 133 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; } 134 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 135 136 static inline int pm_generic_runtime_idle(struct device *dev) { return 0; } 137 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 138 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 139 static inline void pm_runtime_no_callbacks(struct device *dev) {} 140 static inline void pm_runtime_irq_safe(struct device *dev) {} 141 142 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; } 143 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 144 static inline void __pm_runtime_use_autosuspend(struct device *dev, 145 bool use) {} 146 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 147 int delay) {} 148 static inline unsigned long pm_runtime_autosuspend_expiration( 149 struct device *dev) { return 0; } 150 151 #endif /* !CONFIG_PM_RUNTIME */ 152 153 static inline int pm_runtime_idle(struct device *dev) 154 { 155 return __pm_runtime_idle(dev, 0); 156 } 157 158 static inline int pm_runtime_suspend(struct device *dev) 159 { 160 return __pm_runtime_suspend(dev, 0); 161 } 162 163 static inline int pm_runtime_autosuspend(struct device *dev) 164 { 165 return __pm_runtime_suspend(dev, RPM_AUTO); 166 } 167 168 static inline int pm_runtime_resume(struct device *dev) 169 { 170 return __pm_runtime_resume(dev, 0); 171 } 172 173 static inline int pm_request_idle(struct device *dev) 174 { 175 return __pm_runtime_idle(dev, RPM_ASYNC); 176 } 177 178 static inline int pm_request_resume(struct device *dev) 179 { 180 return __pm_runtime_resume(dev, RPM_ASYNC); 181 } 182 183 static inline int pm_request_autosuspend(struct device *dev) 184 { 185 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 186 } 187 188 static inline int pm_runtime_get(struct device *dev) 189 { 190 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 191 } 192 193 static inline int pm_runtime_get_sync(struct device *dev) 194 { 195 return __pm_runtime_resume(dev, RPM_GET_PUT); 196 } 197 198 static inline int pm_runtime_put(struct device *dev) 199 { 200 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 201 } 202 203 static inline int pm_runtime_put_autosuspend(struct device *dev) 204 { 205 return __pm_runtime_suspend(dev, 206 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 207 } 208 209 static inline int pm_runtime_put_sync(struct device *dev) 210 { 211 return __pm_runtime_idle(dev, RPM_GET_PUT); 212 } 213 214 static inline int pm_runtime_put_sync_suspend(struct device *dev) 215 { 216 return __pm_runtime_suspend(dev, RPM_GET_PUT); 217 } 218 219 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 220 { 221 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 222 } 223 224 static inline int pm_runtime_set_active(struct device *dev) 225 { 226 return __pm_runtime_set_status(dev, RPM_ACTIVE); 227 } 228 229 static inline void pm_runtime_set_suspended(struct device *dev) 230 { 231 __pm_runtime_set_status(dev, RPM_SUSPENDED); 232 } 233 234 static inline void pm_runtime_disable(struct device *dev) 235 { 236 __pm_runtime_disable(dev, true); 237 } 238 239 static inline void pm_runtime_use_autosuspend(struct device *dev) 240 { 241 __pm_runtime_use_autosuspend(dev, true); 242 } 243 244 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 245 { 246 __pm_runtime_use_autosuspend(dev, false); 247 } 248 249 #endif 250