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