include/linux/pm_runtime.h

   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