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 27 extern int pm_generic_runtime_suspend(struct device *dev); 28 extern int pm_generic_runtime_resume(struct device *dev); 29 #else 30 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 31 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 32 #endif 33 34 #ifdef CONFIG_PM_RUNTIME 35 36 extern struct workqueue_struct *pm_wq; 37 38 extern int __pm_runtime_idle(struct device *dev, int rpmflags); 39 extern int __pm_runtime_suspend(struct device *dev, int rpmflags); 40 extern int __pm_runtime_resume(struct device *dev, int rpmflags); 41 extern int pm_schedule_suspend(struct device *dev, unsigned int delay); 42 extern int __pm_runtime_set_status(struct device *dev, unsigned int status); 43 extern int pm_runtime_barrier(struct device *dev); 44 extern void pm_runtime_enable(struct device *dev); 45 extern void __pm_runtime_disable(struct device *dev, bool check_resume); 46 extern void pm_runtime_allow(struct device *dev); 47 extern void pm_runtime_forbid(struct device *dev); 48 extern void pm_runtime_no_callbacks(struct device *dev); 49 extern void pm_runtime_irq_safe(struct device *dev); 50 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use); 51 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); 52 extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev); 53 extern void pm_runtime_update_max_time_suspended(struct device *dev, 54 s64 delta_ns); 55 extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable); 56 57 static inline bool pm_children_suspended(struct device *dev) 58 { 59 return dev->power.ignore_children 60 || !atomic_read(&dev->power.child_count); 61 } 62 63 static inline void pm_runtime_get_noresume(struct device *dev) 64 { 65 atomic_inc(&dev->power.usage_count); 66 } 67 68 static inline void pm_runtime_put_noidle(struct device *dev) 69 { 70 atomic_add_unless(&dev->power.usage_count, -1, 0); 71 } 72 73 static inline bool device_run_wake(struct device *dev) 74 { 75 return dev->power.run_wake; 76 } 77 78 static inline void device_set_run_wake(struct device *dev, bool enable) 79 { 80 dev->power.run_wake = enable; 81 } 82 83 static inline bool pm_runtime_suspended(struct device *dev) 84 { 85 return dev->power.runtime_status == RPM_SUSPENDED 86 && !dev->power.disable_depth; 87 } 88 89 static inline bool pm_runtime_active(struct device *dev) 90 { 91 return dev->power.runtime_status == RPM_ACTIVE 92 || dev->power.disable_depth; 93 } 94 95 static inline bool pm_runtime_status_suspended(struct device *dev) 96 { 97 return dev->power.runtime_status == RPM_SUSPENDED; 98 } 99 100 static inline bool pm_runtime_enabled(struct device *dev) 101 { 102 return !dev->power.disable_depth; 103 } 104 105 static inline bool pm_runtime_callbacks_present(struct device *dev) 106 { 107 return !dev->power.no_callbacks; 108 } 109 110 static inline void pm_runtime_mark_last_busy(struct device *dev) 111 { 112 ACCESS_ONCE(dev->power.last_busy) = jiffies; 113 } 114 115 #else /* !CONFIG_PM_RUNTIME */ 116 117 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 118 { 119 return -ENOSYS; 120 } 121 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 122 { 123 return -ENOSYS; 124 } 125 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 126 { 127 return 1; 128 } 129 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 130 { 131 return -ENOSYS; 132 } 133 static inline int __pm_runtime_set_status(struct device *dev, 134 unsigned int status) { return 0; } 135 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 136 static inline void pm_runtime_enable(struct device *dev) {} 137 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 138 static inline void pm_runtime_allow(struct device *dev) {} 139 static inline void pm_runtime_forbid(struct device *dev) {} 140 141 static inline bool pm_children_suspended(struct device *dev) { return false; } 142 static inline void pm_runtime_get_noresume(struct device *dev) {} 143 static inline void pm_runtime_put_noidle(struct device *dev) {} 144 static inline bool device_run_wake(struct device *dev) { return false; } 145 static inline void device_set_run_wake(struct device *dev, bool enable) {} 146 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 147 static inline bool pm_runtime_active(struct device *dev) { return true; } 148 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; } 149 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 150 151 static inline void pm_runtime_no_callbacks(struct device *dev) {} 152 static inline void pm_runtime_irq_safe(struct device *dev) {} 153 154 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; } 155 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 156 static inline void __pm_runtime_use_autosuspend(struct device *dev, 157 bool use) {} 158 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 159 int delay) {} 160 static inline unsigned long pm_runtime_autosuspend_expiration( 161 struct device *dev) { return 0; } 162 static inline void pm_runtime_set_memalloc_noio(struct device *dev, 163 bool enable){} 164 165 #endif /* !CONFIG_PM_RUNTIME */ 166 167 static inline int pm_runtime_idle(struct device *dev) 168 { 169 return __pm_runtime_idle(dev, 0); 170 } 171 172 static inline int pm_runtime_suspend(struct device *dev) 173 { 174 return __pm_runtime_suspend(dev, 0); 175 } 176 177 static inline int pm_runtime_autosuspend(struct device *dev) 178 { 179 return __pm_runtime_suspend(dev, RPM_AUTO); 180 } 181 182 static inline int pm_runtime_resume(struct device *dev) 183 { 184 return __pm_runtime_resume(dev, 0); 185 } 186 187 static inline int pm_request_idle(struct device *dev) 188 { 189 return __pm_runtime_idle(dev, RPM_ASYNC); 190 } 191 192 static inline int pm_request_resume(struct device *dev) 193 { 194 return __pm_runtime_resume(dev, RPM_ASYNC); 195 } 196 197 static inline int pm_request_autosuspend(struct device *dev) 198 { 199 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 200 } 201 202 static inline int pm_runtime_get(struct device *dev) 203 { 204 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 205 } 206 207 static inline int pm_runtime_get_sync(struct device *dev) 208 { 209 return __pm_runtime_resume(dev, RPM_GET_PUT); 210 } 211 212 static inline int pm_runtime_put(struct device *dev) 213 { 214 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 215 } 216 217 static inline int pm_runtime_put_autosuspend(struct device *dev) 218 { 219 return __pm_runtime_suspend(dev, 220 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 221 } 222 223 static inline int pm_runtime_put_sync(struct device *dev) 224 { 225 return __pm_runtime_idle(dev, RPM_GET_PUT); 226 } 227 228 static inline int pm_runtime_put_sync_suspend(struct device *dev) 229 { 230 return __pm_runtime_suspend(dev, RPM_GET_PUT); 231 } 232 233 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 234 { 235 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 236 } 237 238 static inline int pm_runtime_set_active(struct device *dev) 239 { 240 return __pm_runtime_set_status(dev, RPM_ACTIVE); 241 } 242 243 static inline void pm_runtime_set_suspended(struct device *dev) 244 { 245 __pm_runtime_set_status(dev, RPM_SUSPENDED); 246 } 247 248 static inline void pm_runtime_disable(struct device *dev) 249 { 250 __pm_runtime_disable(dev, true); 251 } 252 253 static inline void pm_runtime_use_autosuspend(struct device *dev) 254 { 255 __pm_runtime_use_autosuspend(dev, true); 256 } 257 258 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 259 { 260 __pm_runtime_use_autosuspend(dev, false); 261 } 262 263 #endif 264