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 struct workqueue_struct *pm_wq; 28 29 static inline bool queue_pm_work(struct work_struct *work) 30 { 31 return queue_work(pm_wq, work); 32 } 33 34 extern int pm_generic_runtime_suspend(struct device *dev); 35 extern int pm_generic_runtime_resume(struct device *dev); 36 extern int pm_runtime_force_suspend(struct device *dev); 37 extern int pm_runtime_force_resume(struct device *dev); 38 #else 39 static inline bool queue_pm_work(struct work_struct *work) { return false; } 40 41 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 42 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 43 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; } 44 static inline int pm_runtime_force_resume(struct device *dev) { return 0; } 45 #endif 46 47 #ifdef CONFIG_PM_RUNTIME 48 49 extern int __pm_runtime_idle(struct device *dev, int rpmflags); 50 extern int __pm_runtime_suspend(struct device *dev, int rpmflags); 51 extern int __pm_runtime_resume(struct device *dev, int rpmflags); 52 extern int pm_schedule_suspend(struct device *dev, unsigned int delay); 53 extern int __pm_runtime_set_status(struct device *dev, unsigned int status); 54 extern int pm_runtime_barrier(struct device *dev); 55 extern void pm_runtime_enable(struct device *dev); 56 extern void __pm_runtime_disable(struct device *dev, bool check_resume); 57 extern void pm_runtime_allow(struct device *dev); 58 extern void pm_runtime_forbid(struct device *dev); 59 extern void pm_runtime_no_callbacks(struct device *dev); 60 extern void pm_runtime_irq_safe(struct device *dev); 61 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use); 62 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); 63 extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev); 64 extern void pm_runtime_update_max_time_suspended(struct device *dev, 65 s64 delta_ns); 66 extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable); 67 68 static inline bool pm_children_suspended(struct device *dev) 69 { 70 return dev->power.ignore_children 71 || !atomic_read(&dev->power.child_count); 72 } 73 74 static inline void pm_runtime_get_noresume(struct device *dev) 75 { 76 atomic_inc(&dev->power.usage_count); 77 } 78 79 static inline void pm_runtime_put_noidle(struct device *dev) 80 { 81 atomic_add_unless(&dev->power.usage_count, -1, 0); 82 } 83 84 static inline bool device_run_wake(struct device *dev) 85 { 86 return dev->power.run_wake; 87 } 88 89 static inline void device_set_run_wake(struct device *dev, bool enable) 90 { 91 dev->power.run_wake = enable; 92 } 93 94 static inline bool pm_runtime_suspended(struct device *dev) 95 { 96 return dev->power.runtime_status == RPM_SUSPENDED 97 && !dev->power.disable_depth; 98 } 99 100 static inline bool pm_runtime_active(struct device *dev) 101 { 102 return dev->power.runtime_status == RPM_ACTIVE 103 || dev->power.disable_depth; 104 } 105 106 static inline bool pm_runtime_status_suspended(struct device *dev) 107 { 108 return dev->power.runtime_status == RPM_SUSPENDED; 109 } 110 111 static inline bool pm_runtime_suspended_if_enabled(struct device *dev) 112 { 113 return pm_runtime_status_suspended(dev) && dev->power.disable_depth == 1; 114 } 115 116 static inline bool pm_runtime_enabled(struct device *dev) 117 { 118 return !dev->power.disable_depth; 119 } 120 121 static inline bool pm_runtime_callbacks_present(struct device *dev) 122 { 123 return !dev->power.no_callbacks; 124 } 125 126 static inline void pm_runtime_mark_last_busy(struct device *dev) 127 { 128 ACCESS_ONCE(dev->power.last_busy) = jiffies; 129 } 130 131 #else /* !CONFIG_PM_RUNTIME */ 132 133 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 134 { 135 return -ENOSYS; 136 } 137 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 138 { 139 return -ENOSYS; 140 } 141 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 142 { 143 return 1; 144 } 145 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 146 { 147 return -ENOSYS; 148 } 149 static inline int __pm_runtime_set_status(struct device *dev, 150 unsigned int status) { return 0; } 151 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 152 static inline void pm_runtime_enable(struct device *dev) {} 153 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 154 static inline void pm_runtime_allow(struct device *dev) {} 155 static inline void pm_runtime_forbid(struct device *dev) {} 156 157 static inline bool pm_children_suspended(struct device *dev) { return false; } 158 static inline void pm_runtime_get_noresume(struct device *dev) {} 159 static inline void pm_runtime_put_noidle(struct device *dev) {} 160 static inline bool device_run_wake(struct device *dev) { return false; } 161 static inline void device_set_run_wake(struct device *dev, bool enable) {} 162 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 163 static inline bool pm_runtime_active(struct device *dev) { return true; } 164 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; } 165 static inline bool pm_runtime_suspended_if_enabled(struct device *dev) { return false; } 166 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 167 168 static inline void pm_runtime_no_callbacks(struct device *dev) {} 169 static inline void pm_runtime_irq_safe(struct device *dev) {} 170 171 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; } 172 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 173 static inline void __pm_runtime_use_autosuspend(struct device *dev, 174 bool use) {} 175 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 176 int delay) {} 177 static inline unsigned long pm_runtime_autosuspend_expiration( 178 struct device *dev) { return 0; } 179 static inline void pm_runtime_set_memalloc_noio(struct device *dev, 180 bool enable){} 181 182 #endif /* !CONFIG_PM_RUNTIME */ 183 184 static inline int pm_runtime_idle(struct device *dev) 185 { 186 return __pm_runtime_idle(dev, 0); 187 } 188 189 static inline int pm_runtime_suspend(struct device *dev) 190 { 191 return __pm_runtime_suspend(dev, 0); 192 } 193 194 static inline int pm_runtime_autosuspend(struct device *dev) 195 { 196 return __pm_runtime_suspend(dev, RPM_AUTO); 197 } 198 199 static inline int pm_runtime_resume(struct device *dev) 200 { 201 return __pm_runtime_resume(dev, 0); 202 } 203 204 static inline int pm_request_idle(struct device *dev) 205 { 206 return __pm_runtime_idle(dev, RPM_ASYNC); 207 } 208 209 static inline int pm_request_resume(struct device *dev) 210 { 211 return __pm_runtime_resume(dev, RPM_ASYNC); 212 } 213 214 static inline int pm_request_autosuspend(struct device *dev) 215 { 216 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 217 } 218 219 static inline int pm_runtime_get(struct device *dev) 220 { 221 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 222 } 223 224 static inline int pm_runtime_get_sync(struct device *dev) 225 { 226 return __pm_runtime_resume(dev, RPM_GET_PUT); 227 } 228 229 static inline int pm_runtime_put(struct device *dev) 230 { 231 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 232 } 233 234 static inline int pm_runtime_put_autosuspend(struct device *dev) 235 { 236 return __pm_runtime_suspend(dev, 237 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 238 } 239 240 static inline int pm_runtime_put_sync(struct device *dev) 241 { 242 return __pm_runtime_idle(dev, RPM_GET_PUT); 243 } 244 245 static inline int pm_runtime_put_sync_suspend(struct device *dev) 246 { 247 return __pm_runtime_suspend(dev, RPM_GET_PUT); 248 } 249 250 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 251 { 252 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 253 } 254 255 static inline int pm_runtime_set_active(struct device *dev) 256 { 257 return __pm_runtime_set_status(dev, RPM_ACTIVE); 258 } 259 260 static inline void pm_runtime_set_suspended(struct device *dev) 261 { 262 __pm_runtime_set_status(dev, RPM_SUSPENDED); 263 } 264 265 static inline void pm_runtime_disable(struct device *dev) 266 { 267 __pm_runtime_disable(dev, true); 268 } 269 270 static inline void pm_runtime_use_autosuspend(struct device *dev) 271 { 272 __pm_runtime_use_autosuspend(dev, true); 273 } 274 275 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 276 { 277 __pm_runtime_use_autosuspend(dev, false); 278 } 279 280 #endif 281