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