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_enabled(struct device *dev) 105 { 106 return !dev->power.disable_depth; 107 } 108 109 static inline bool pm_runtime_callbacks_present(struct device *dev) 110 { 111 return !dev->power.no_callbacks; 112 } 113 114 static inline void pm_runtime_mark_last_busy(struct device *dev) 115 { 116 ACCESS_ONCE(dev->power.last_busy) = jiffies; 117 } 118 119 #else /* !CONFIG_PM_RUNTIME */ 120 121 static inline int __pm_runtime_idle(struct device *dev, int rpmflags) 122 { 123 return -ENOSYS; 124 } 125 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags) 126 { 127 return -ENOSYS; 128 } 129 static inline int __pm_runtime_resume(struct device *dev, int rpmflags) 130 { 131 return 1; 132 } 133 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay) 134 { 135 return -ENOSYS; 136 } 137 static inline int __pm_runtime_set_status(struct device *dev, 138 unsigned int status) { return 0; } 139 static inline int pm_runtime_barrier(struct device *dev) { return 0; } 140 static inline void pm_runtime_enable(struct device *dev) {} 141 static inline void __pm_runtime_disable(struct device *dev, bool c) {} 142 static inline void pm_runtime_allow(struct device *dev) {} 143 static inline void pm_runtime_forbid(struct device *dev) {} 144 145 static inline bool pm_children_suspended(struct device *dev) { return false; } 146 static inline void pm_runtime_get_noresume(struct device *dev) {} 147 static inline void pm_runtime_put_noidle(struct device *dev) {} 148 static inline bool device_run_wake(struct device *dev) { return false; } 149 static inline void device_set_run_wake(struct device *dev, bool enable) {} 150 static inline bool pm_runtime_suspended(struct device *dev) { return false; } 151 static inline bool pm_runtime_active(struct device *dev) { return true; } 152 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; } 153 static inline bool pm_runtime_enabled(struct device *dev) { return false; } 154 155 static inline void pm_runtime_no_callbacks(struct device *dev) {} 156 static inline void pm_runtime_irq_safe(struct device *dev) {} 157 158 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; } 159 static inline void pm_runtime_mark_last_busy(struct device *dev) {} 160 static inline void __pm_runtime_use_autosuspend(struct device *dev, 161 bool use) {} 162 static inline void pm_runtime_set_autosuspend_delay(struct device *dev, 163 int delay) {} 164 static inline unsigned long pm_runtime_autosuspend_expiration( 165 struct device *dev) { return 0; } 166 static inline void pm_runtime_set_memalloc_noio(struct device *dev, 167 bool enable){} 168 169 #endif /* !CONFIG_PM_RUNTIME */ 170 171 static inline int pm_runtime_idle(struct device *dev) 172 { 173 return __pm_runtime_idle(dev, 0); 174 } 175 176 static inline int pm_runtime_suspend(struct device *dev) 177 { 178 return __pm_runtime_suspend(dev, 0); 179 } 180 181 static inline int pm_runtime_autosuspend(struct device *dev) 182 { 183 return __pm_runtime_suspend(dev, RPM_AUTO); 184 } 185 186 static inline int pm_runtime_resume(struct device *dev) 187 { 188 return __pm_runtime_resume(dev, 0); 189 } 190 191 static inline int pm_request_idle(struct device *dev) 192 { 193 return __pm_runtime_idle(dev, RPM_ASYNC); 194 } 195 196 static inline int pm_request_resume(struct device *dev) 197 { 198 return __pm_runtime_resume(dev, RPM_ASYNC); 199 } 200 201 static inline int pm_request_autosuspend(struct device *dev) 202 { 203 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO); 204 } 205 206 static inline int pm_runtime_get(struct device *dev) 207 { 208 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC); 209 } 210 211 static inline int pm_runtime_get_sync(struct device *dev) 212 { 213 return __pm_runtime_resume(dev, RPM_GET_PUT); 214 } 215 216 static inline int pm_runtime_put(struct device *dev) 217 { 218 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC); 219 } 220 221 static inline int pm_runtime_put_autosuspend(struct device *dev) 222 { 223 return __pm_runtime_suspend(dev, 224 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO); 225 } 226 227 static inline int pm_runtime_put_sync(struct device *dev) 228 { 229 return __pm_runtime_idle(dev, RPM_GET_PUT); 230 } 231 232 static inline int pm_runtime_put_sync_suspend(struct device *dev) 233 { 234 return __pm_runtime_suspend(dev, RPM_GET_PUT); 235 } 236 237 static inline int pm_runtime_put_sync_autosuspend(struct device *dev) 238 { 239 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO); 240 } 241 242 static inline int pm_runtime_set_active(struct device *dev) 243 { 244 return __pm_runtime_set_status(dev, RPM_ACTIVE); 245 } 246 247 static inline void pm_runtime_set_suspended(struct device *dev) 248 { 249 __pm_runtime_set_status(dev, RPM_SUSPENDED); 250 } 251 252 static inline void pm_runtime_disable(struct device *dev) 253 { 254 __pm_runtime_disable(dev, true); 255 } 256 257 static inline void pm_runtime_use_autosuspend(struct device *dev) 258 { 259 __pm_runtime_use_autosuspend(dev, true); 260 } 261 262 static inline void pm_runtime_dont_use_autosuspend(struct device *dev) 263 { 264 __pm_runtime_use_autosuspend(dev, false); 265 } 266 267 #endif 268