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