1 /* 2 * pm_runtime.h - Device run-time power management helper functions. 3 * 4 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl> 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_suspended_if_enabled(struct device *dev) 102 { 103 return pm_runtime_status_suspended(dev) && dev->power.disable_depth == 1; 104 } 105 106 static inline bool pm_runtime_enabled(struct device *dev) 107 { 108 return !dev->power.disable_depth; 109 } 110 111 static inline bool pm_runtime_callbacks_present(struct device *dev) 112 { 113 return !dev->power.no_callbacks; 114 } 115 116 static inline void pm_runtime_mark_last_busy(struct device *dev) 117 { 118 ACCESS_ONCE(dev->power.last_busy) = jiffies; 119 } 120 121 static inline bool pm_runtime_is_irq_safe(struct device *dev) 122 { 123 return dev->power.irq_safe; 124 } 125 126 #else /* !CONFIG_PM */ 127 128 static inline bool queue_pm_work(struct work_struct *work) { return false; } 129 130 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; } 131 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; } 132 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; } 133 static inline int pm_runtime_force_resume(struct device *dev) { return 0; } 134 135 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 136 { 137 return -ENOSYS; 138 } 139 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 140 { 141 return -ENOSYS; 142 } 143 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 144 { 145 return 1; 146 } 147 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 148 { 149 return -ENOSYS; 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_suspended_if_enabled(struct device *dev) { return false; } 168 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 169 170 static inline void pm_runtime_no_callbacks(struct device *dev) {} 171 static inline void pm_runtime_irq_safe(struct device *dev) {} 172 static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; } 173 174 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; } 175 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 176 static inline void __pm_runtime_use_autosuspend(struct device *dev, 177 bool use) {} 178 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 179 int delay) {} 180 static inline unsigned long pm_runtime_autosuspend_expiration( 181 struct device *dev) { return 0; } 182 static inline void pm_runtime_set_memalloc_noio(struct device *dev, 183 bool enable){} 184 185 #endif /* !CONFIG_PM */ 186 187 static inline int pm_runtime_idle(struct device *dev) 188 { 189 return __pm_runtime_idle(dev, 0); 190 } 191 192 static inline int pm_runtime_suspend(struct device *dev) 193 { 194 return __pm_runtime_suspend(dev, 0); 195 } 196 197 static inline int pm_runtime_autosuspend(struct device *dev) 198 { 199 return __pm_runtime_suspend(dev, RPM_AUTO); 200 } 201 202 static inline int pm_runtime_resume(struct device *dev) 203 { 204 return __pm_runtime_resume(dev, 0); 205 } 206 207 static inline int pm_request_idle(struct device *dev) 208 { 209 return __pm_runtime_idle(dev, RPM_ASYNC); 210 } 211 212 static inline int pm_request_resume(struct device *dev) 213 { 214 return __pm_runtime_resume(dev, RPM_ASYNC); 215 } 216 217 static inline int pm_request_autosuspend(struct device *dev) 218 { 219 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 220 } 221 222 static inline int pm_runtime_get(struct device *dev) 223 { 224 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 225 } 226 227 static inline int pm_runtime_get_sync(struct device *dev) 228 { 229 return __pm_runtime_resume(dev, RPM_GET_PUT); 230 } 231 232 static inline int pm_runtime_put(struct device *dev) 233 { 234 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 235 } 236 237 static inline int pm_runtime_put_autosuspend(struct device *dev) 238 { 239 return __pm_runtime_suspend(dev, 240 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 241 } 242 243 static inline int pm_runtime_put_sync(struct device *dev) 244 { 245 return __pm_runtime_idle(dev, RPM_GET_PUT); 246 } 247 248 static inline int pm_runtime_put_sync_suspend(struct device *dev) 249 { 250 return __pm_runtime_suspend(dev, RPM_GET_PUT); 251 } 252 253 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 254 { 255 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 256 } 257 258 static inline int pm_runtime_set_active(struct device *dev) 259 { 260 return __pm_runtime_set_status(dev, RPM_ACTIVE); 261 } 262 263 static inline void pm_runtime_set_suspended(struct device *dev) 264 { 265 __pm_runtime_set_status(dev, RPM_SUSPENDED); 266 } 267 268 static inline void pm_runtime_disable(struct device *dev) 269 { 270 __pm_runtime_disable(dev, true); 271 } 272 273 static inline void pm_runtime_use_autosuspend(struct device *dev) 274 { 275 __pm_runtime_use_autosuspend(dev, true); 276 } 277 278 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 279 { 280 __pm_runtime_use_autosuspend(dev, false); 281 } 282 283 #endif 284