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 #else
  39 static inline bool queue_pm_work(struct work_struct *work) { return false; }
  40
  41 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
  42 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
  43 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
  44 static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
  45 #endif
  46
  47 #ifdef CONFIG_PM_RUNTIME
  48
  49 extern int __pm_runtime_idle(struct device *dev, int rpmflags);
  50 extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
  51 extern int __pm_runtime_resume(struct device *dev, int rpmflags);
  52 extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
  53 extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
  54 extern int pm_runtime_barrier(struct device *dev);
  55 extern void pm_runtime_enable(struct device *dev);
  56 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
  57 extern void pm_runtime_allow(struct device *dev);
  58 extern void pm_runtime_forbid(struct device *dev);
  59 extern void pm_runtime_no_callbacks(struct device *dev);
  60 extern void pm_runtime_irq_safe(struct device *dev);
  61 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
  62 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
  63 extern unsigned long pm_runtime_autosuspend_expiration(struct device *dev);
  64 extern void pm_runtime_update_max_time_suspended(struct device *dev,
  65                                                  s64 delta_ns);
  66 extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
  67
  68 static inline bool pm_children_suspended(struct device *dev)
  69 {
  70         return dev->power.ignore_children
  71                 || !atomic_read(&dev->power.child_count);
  72 }
  73
  74 static inline void pm_runtime_get_noresume(struct device *dev)
  75 {
  76         atomic_inc(&dev->power.usage_count);
  77 }
  78
  79 static inline void pm_runtime_put_noidle(struct device *dev)
  80 {
  81         atomic_add_unless(&dev->power.usage_count, -1, 0);
  82 }
  83
  84 static inline bool device_run_wake(struct device *dev)
  85 {
  86         return dev->power.run_wake;
  87 }
  88
  89 static inline void device_set_run_wake(struct device *dev, bool enable)
  90 {
  91         dev->power.run_wake = enable;
  92 }
  93
  94 static inline bool pm_runtime_suspended(struct device *dev)
  95 {
  96         return dev->power.runtime_status == RPM_SUSPENDED
  97                 && !dev->power.disable_depth;
  98 }
  99
 100 static inline bool pm_runtime_active(struct device *dev)
 101 {
 102         return dev->power.runtime_status == RPM_ACTIVE
 103                 || dev->power.disable_depth;
 104 }
 105
 106 static inline bool pm_runtime_status_suspended(struct device *dev)
 107 {
 108         return dev->power.runtime_status == RPM_SUSPENDED;
 109 }
 110
 111 static inline bool pm_runtime_suspended_if_enabled(struct device *dev)
 112 {
 113         return pm_runtime_status_suspended(dev) && dev->power.disable_depth == 1;
 114 }
 115
 116 static inline bool pm_runtime_enabled(struct device *dev)
 117 {
 118         return !dev->power.disable_depth;
 119 }
 120
 121 static inline bool pm_runtime_callbacks_present(struct device *dev)
 122 {
 123         return !dev->power.no_callbacks;
 124 }
 125
 126 static inline void pm_runtime_mark_last_busy(struct device *dev)
 127 {
 128         ACCESS_ONCE(dev->power.last_busy) = jiffies;
 129 }
 130
 131 #else /* !CONFIG_PM_RUNTIME */
 132
 133 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
 134 {
 135         return -ENOSYS;
 136 }
 137 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
 138 {
 139         return -ENOSYS;
 140 }
 141 static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
 142 {
 143         return 1;
 144 }
 145 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
 146 {
 147         return -ENOSYS;
 148 }
 149 static inline int __pm_runtime_set_status(struct device *dev,
 150                                             unsigned int status) { return 0; }
 151 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
 152 static inline void pm_runtime_enable(struct device *dev) {}
 153 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
 154 static inline void pm_runtime_allow(struct device *dev) {}
 155 static inline void pm_runtime_forbid(struct device *dev) {}
 156
 157 static inline bool pm_children_suspended(struct device *dev) { return false; }
 158 static inline void pm_runtime_get_noresume(struct device *dev) {}
 159 static inline void pm_runtime_put_noidle(struct device *dev) {}
 160 static inline bool device_run_wake(struct device *dev) { return false; }
 161 static inline void device_set_run_wake(struct device *dev, bool enable) {}
 162 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
 163 static inline bool pm_runtime_active(struct device *dev) { return true; }
 164 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
 165 static inline bool pm_runtime_suspended_if_enabled(struct device *dev) { return false; }
 166 static inline bool pm_runtime_enabled(struct device *dev) { return false; }
 167
 168 static inline void pm_runtime_no_callbacks(struct device *dev) {}
 169 static inline void pm_runtime_irq_safe(struct device *dev) {}
 170
 171 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; }
 172 static inline void pm_runtime_mark_last_busy(struct device *dev) {}
 173 static inline void __pm_runtime_use_autosuspend(struct device *dev,
 174                                                 bool use) {}
 175 static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
 176                                                 int delay) {}
 177 static inline unsigned long pm_runtime_autosuspend_expiration(
 178                                 struct device *dev) { return 0; }
 179 static inline void pm_runtime_set_memalloc_noio(struct device *dev,
 180                                                 bool enable){}
 181
 182 #endif /* !CONFIG_PM_RUNTIME */
 183
 184 static inline int pm_runtime_idle(struct device *dev)
 185 {
 186         return __pm_runtime_idle(dev, 0);
 187 }
 188
 189 static inline int pm_runtime_suspend(struct device *dev)
 190 {
 191         return __pm_runtime_suspend(dev, 0);
 192 }
 193
 194 static inline int pm_runtime_autosuspend(struct device *dev)
 195 {
 196         return __pm_runtime_suspend(dev, RPM_AUTO);
 197 }
 198
 199 static inline int pm_runtime_resume(struct device *dev)
 200 {
 201         return __pm_runtime_resume(dev, 0);
 202 }
 203
 204 static inline int pm_request_idle(struct device *dev)
 205 {
 206         return __pm_runtime_idle(dev, RPM_ASYNC);
 207 }
 208
 209 static inline int pm_request_resume(struct device *dev)
 210 {
 211         return __pm_runtime_resume(dev, RPM_ASYNC);
 212 }
 213
 214 static inline int pm_request_autosuspend(struct device *dev)
 215 {
 216         return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
 217 }
 218
 219 static inline int pm_runtime_get(struct device *dev)
 220 {
 221         return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
 222 }
 223
 224 static inline int pm_runtime_get_sync(struct device *dev)
 225 {
 226         return __pm_runtime_resume(dev, RPM_GET_PUT);
 227 }
 228
 229 static inline int pm_runtime_put(struct device *dev)
 230 {
 231         return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
 232 }
 233
 234 static inline int pm_runtime_put_autosuspend(struct device *dev)
 235 {
 236         return __pm_runtime_suspend(dev,
 237             RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
 238 }
 239
 240 static inline int pm_runtime_put_sync(struct device *dev)
 241 {
 242         return __pm_runtime_idle(dev, RPM_GET_PUT);
 243 }
 244
 245 static inline int pm_runtime_put_sync_suspend(struct device *dev)
 246 {
 247         return __pm_runtime_suspend(dev, RPM_GET_PUT);
 248 }
 249
 250 static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
 251 {
 252         return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
 253 }
 254
 255 static inline int pm_runtime_set_active(struct device *dev)
 256 {
 257         return __pm_runtime_set_status(dev, RPM_ACTIVE);
 258 }
 259
 260 static inline void pm_runtime_set_suspended(struct device *dev)
 261 {
 262         __pm_runtime_set_status(dev, RPM_SUSPENDED);
 263 }
 264
 265 static inline void pm_runtime_disable(struct device *dev)
 266 {
 267         __pm_runtime_disable(dev, true);
 268 }
 269
 270 static inline void pm_runtime_use_autosuspend(struct device *dev)
 271 {
 272         __pm_runtime_use_autosuspend(dev, true);
 273 }
 274
 275 static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
 276 {
 277         __pm_runtime_use_autosuspend(dev, false);
 278 }
 279
 280 #endif