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