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_runtime_get_if_in_use(struct device *dev); 43 extern int pm_schedule_suspend(struct device *dev, unsigned int delay); 44 extern int __pm_runtime_set_status(struct device *dev, unsigned int status); 45 extern int pm_runtime_barrier(struct device *dev); 46 extern void pm_runtime_enable(struct device *dev); 47 extern void __pm_runtime_disable(struct device *dev, bool check_resume); 48 extern void pm_runtime_allow(struct device *dev); 49 extern void pm_runtime_forbid(struct device *dev); 50 extern void pm_runtime_no_callbacks(struct device *dev); 51 extern void pm_runtime_irq_safe(struct device *dev); 52 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use); 53 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay); 54 extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev); 55 extern void pm_runtime_update_max_time_suspended(struct device *dev, 56 s64 delta_ns); 57 extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable); 58 59 static inline bool pm_children_suspended(struct device *dev) 60 { 61 return dev->power.ignore_children 62 || !atomic_read(&dev->power.child_count); 63 } 64 65 static inline void pm_runtime_get_noresume(struct device *dev) 66 { 67 atomic_inc(&dev->power.usage_count); 68 } 69 70 static inline void pm_runtime_put_noidle(struct device *dev) 71 { 72 atomic_add_unless(&dev->power.usage_count, -1, 0); 73 } 74 75 static inline bool device_run_wake(struct device *dev) 76 { 77 return dev->power.run_wake; 78 } 79 80 static inline void device_set_run_wake(struct device *dev, bool enable) 81 { 82 dev->power.run_wake = enable; 83 } 84 85 static inline bool pm_runtime_suspended(struct device *dev) 86 { 87 return dev->power.runtime_status == RPM_SUSPENDED 88 && !dev->power.disable_depth; 89 } 90 91 static inline bool pm_runtime_active(struct device *dev) 92 { 93 return dev->power.runtime_status == RPM_ACTIVE 94 || dev->power.disable_depth; 95 } 96 97 static inline bool pm_runtime_status_suspended(struct device *dev) 98 { 99 return dev->power.runtime_status == RPM_SUSPENDED; 100 } 101 102 static inline bool pm_runtime_enabled(struct device *dev) 103 { 104 return !dev->power.disable_depth; 105 } 106 107 static inline bool pm_runtime_callbacks_present(struct device *dev) 108 { 109 return !dev->power.no_callbacks; 110 } 111 112 static inline void pm_runtime_mark_last_busy(struct device *dev) 113 { 114 ACCESS_ONCE(dev->power.last_busy) = jiffies; 115 } 116 117 static inline bool pm_runtime_is_irq_safe(struct device *dev) 118 { 119 return dev->power.irq_safe; 120 } 121 122 #else /* !CONFIG_PM */ 123 124 static inline bool queue_pm_work(struct work_struct *work) { return false; } 125 126 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 127 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 128 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; } 129 static inline int pm_runtime_force_resume(struct device *dev) { return 0; } 130 131 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 132 { 133 return -ENOSYS; 134 } 135 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 136 { 137 return -ENOSYS; 138 } 139 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 140 { 141 return 1; 142 } 143 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 144 { 145 return -ENOSYS; 146 } 147 static inline int pm_runtime_get_if_in_use(struct device *dev) 148 { 149 return -EINVAL; 150 } 151 static inline int __pm_runtime_set_status(struct device *dev, 152 unsigned int status) { return 0; } 153 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 154 static inline void pm_runtime_enable(struct device *dev) {} 155 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 156 static inline void pm_runtime_allow(struct device *dev) {} 157 static inline void pm_runtime_forbid(struct device *dev) {} 158 159 static inline bool pm_children_suspended(struct device *dev) { return false; } 160 static inline void pm_runtime_get_noresume(struct device *dev) {} 161 static inline void pm_runtime_put_noidle(struct device *dev) {} 162 static inline bool device_run_wake(struct device *dev) { return false; } 163 static inline void device_set_run_wake(struct device *dev, bool enable) {} 164 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 165 static inline bool pm_runtime_active(struct device *dev) { return true; } 166 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; } 167 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 168 169 static inline void pm_runtime_no_callbacks(struct device *dev) {} 170 static inline void pm_runtime_irq_safe(struct device *dev) {} 171 static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; } 172 173 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; } 174 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 175 static inline void __pm_runtime_use_autosuspend(struct device *dev, 176 bool use) {} 177 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 178 int delay) {} 179 static inline unsigned long pm_runtime_autosuspend_expiration( 180 struct device *dev) { return 0; } 181 static inline void pm_runtime_set_memalloc_noio(struct device *dev, 182 bool enable){} 183 184 #endif /* !CONFIG_PM */ 185 186 static inline int pm_runtime_idle(struct device *dev) 187 { 188 return __pm_runtime_idle(dev, 0); 189 } 190 191 static inline int pm_runtime_suspend(struct device *dev) 192 { 193 return __pm_runtime_suspend(dev, 0); 194 } 195 196 static inline int pm_runtime_autosuspend(struct device *dev) 197 { 198 return __pm_runtime_suspend(dev, RPM_AUTO); 199 } 200 201 static inline int pm_runtime_resume(struct device *dev) 202 { 203 return __pm_runtime_resume(dev, 0); 204 } 205 206 static inline int pm_request_idle(struct device *dev) 207 { 208 return __pm_runtime_idle(dev, RPM_ASYNC); 209 } 210 211 static inline int pm_request_resume(struct device *dev) 212 { 213 return __pm_runtime_resume(dev, RPM_ASYNC); 214 } 215 216 static inline int pm_request_autosuspend(struct device *dev) 217 { 218 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 219 } 220 221 static inline int pm_runtime_get(struct device *dev) 222 { 223 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 224 } 225 226 static inline int pm_runtime_get_sync(struct device *dev) 227 { 228 return __pm_runtime_resume(dev, RPM_GET_PUT); 229 } 230 231 static inline int pm_runtime_put(struct device *dev) 232 { 233 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 234 } 235 236 static inline int pm_runtime_put_autosuspend(struct device *dev) 237 { 238 return __pm_runtime_suspend(dev, 239 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 240 } 241 242 static inline int pm_runtime_put_sync(struct device *dev) 243 { 244 return __pm_runtime_idle(dev, RPM_GET_PUT); 245 } 246 247 static inline int pm_runtime_put_sync_suspend(struct device *dev) 248 { 249 return __pm_runtime_suspend(dev, RPM_GET_PUT); 250 } 251 252 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 253 { 254 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 255 } 256 257 static inline int pm_runtime_set_active(struct device *dev) 258 { 259 return __pm_runtime_set_status(dev, RPM_ACTIVE); 260 } 261 262 static inline void pm_runtime_set_suspended(struct device *dev) 263 { 264 __pm_runtime_set_status(dev, RPM_SUSPENDED); 265 } 266 267 static inline void pm_runtime_disable(struct device *dev) 268 { 269 __pm_runtime_disable(dev, true); 270 } 271 272 static inline void pm_runtime_use_autosuspend(struct device *dev) 273 { 274 __pm_runtime_use_autosuspend(dev, true); 275 } 276 277 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 278 { 279 __pm_runtime_use_autosuspend(dev, false); 280 } 281 282 #endif 283