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Linux/include/linux/pm_runtime.h

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  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 bool pm_children_suspended(struct device *dev)
 65 {
 66         return dev->power.ignore_children
 67                 || !atomic_read(&dev->power.child_count);
 68 }
 69 
 70 static inline void pm_runtime_get_noresume(struct device *dev)
 71 {
 72         atomic_inc(&dev->power.usage_count);
 73 }
 74 
 75 static inline void pm_runtime_put_noidle(struct device *dev)
 76 {
 77         atomic_add_unless(&dev->power.usage_count, -1, 0);
 78 }
 79 
 80 static inline bool device_run_wake(struct device *dev)
 81 {
 82         return dev->power.run_wake;
 83 }
 84 
 85 static inline void device_set_run_wake(struct device *dev, bool enable)
 86 {
 87         dev->power.run_wake = enable;
 88 }
 89 
 90 static inline bool pm_runtime_suspended(struct device *dev)
 91 {
 92         return dev->power.runtime_status == RPM_SUSPENDED
 93                 && !dev->power.disable_depth;
 94 }
 95 
 96 static inline bool pm_runtime_active(struct device *dev)
 97 {
 98         return dev->power.runtime_status == RPM_ACTIVE
 99                 || dev->power.disable_depth;
100 }
101 
102 static inline bool pm_runtime_status_suspended(struct device *dev)
103 {
104         return dev->power.runtime_status == RPM_SUSPENDED;
105 }
106 
107 static inline bool pm_runtime_enabled(struct device *dev)
108 {
109         return !dev->power.disable_depth;
110 }
111 
112 static inline bool pm_runtime_callbacks_present(struct device *dev)
113 {
114         return !dev->power.no_callbacks;
115 }
116 
117 static inline void pm_runtime_mark_last_busy(struct device *dev)
118 {
119         ACCESS_ONCE(dev->power.last_busy) = jiffies;
120 }
121 
122 static inline bool pm_runtime_is_irq_safe(struct device *dev)
123 {
124         return dev->power.irq_safe;
125 }
126 
127 #else /* !CONFIG_PM */
128 
129 static inline bool queue_pm_work(struct work_struct *work) { return false; }
130 
131 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
132 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
133 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
134 static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
135 
136 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
137 {
138         return -ENOSYS;
139 }
140 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
141 {
142         return -ENOSYS;
143 }
144 static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
145 {
146         return 1;
147 }
148 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
149 {
150         return -ENOSYS;
151 }
152 static inline int pm_runtime_get_if_in_use(struct device *dev)
153 {
154         return -EINVAL;
155 }
156 static inline int __pm_runtime_set_status(struct device *dev,
157                                             unsigned int status) { return 0; }
158 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
159 static inline void pm_runtime_enable(struct device *dev) {}
160 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
161 static inline void pm_runtime_allow(struct device *dev) {}
162 static inline void pm_runtime_forbid(struct device *dev) {}
163 
164 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
165 static inline bool pm_children_suspended(struct device *dev) { return false; }
166 static inline void pm_runtime_get_noresume(struct device *dev) {}
167 static inline void pm_runtime_put_noidle(struct device *dev) {}
168 static inline bool device_run_wake(struct device *dev) { return false; }
169 static inline void device_set_run_wake(struct device *dev, bool enable) {}
170 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
171 static inline bool pm_runtime_active(struct device *dev) { return true; }
172 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
173 static inline bool pm_runtime_enabled(struct device *dev) { return false; }
174 
175 static inline void pm_runtime_no_callbacks(struct device *dev) {}
176 static inline void pm_runtime_irq_safe(struct device *dev) {}
177 static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }
178 
179 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; }
180 static inline void pm_runtime_mark_last_busy(struct device *dev) {}
181 static inline void __pm_runtime_use_autosuspend(struct device *dev,
182                                                 bool use) {}
183 static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
184                                                 int delay) {}
185 static inline unsigned long pm_runtime_autosuspend_expiration(
186                                 struct device *dev) { return 0; }
187 static inline void pm_runtime_set_memalloc_noio(struct device *dev,
188                                                 bool enable){}
189 
190 #endif /* !CONFIG_PM */
191 
192 static inline int pm_runtime_idle(struct device *dev)
193 {
194         return __pm_runtime_idle(dev, 0);
195 }
196 
197 static inline int pm_runtime_suspend(struct device *dev)
198 {
199         return __pm_runtime_suspend(dev, 0);
200 }
201 
202 static inline int pm_runtime_autosuspend(struct device *dev)
203 {
204         return __pm_runtime_suspend(dev, RPM_AUTO);
205 }
206 
207 static inline int pm_runtime_resume(struct device *dev)
208 {
209         return __pm_runtime_resume(dev, 0);
210 }
211 
212 static inline int pm_request_idle(struct device *dev)
213 {
214         return __pm_runtime_idle(dev, RPM_ASYNC);
215 }
216 
217 static inline int pm_request_resume(struct device *dev)
218 {
219         return __pm_runtime_resume(dev, RPM_ASYNC);
220 }
221 
222 static inline int pm_request_autosuspend(struct device *dev)
223 {
224         return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
225 }
226 
227 static inline int pm_runtime_get(struct device *dev)
228 {
229         return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
230 }
231 
232 static inline int pm_runtime_get_sync(struct device *dev)
233 {
234         return __pm_runtime_resume(dev, RPM_GET_PUT);
235 }
236 
237 static inline int pm_runtime_put(struct device *dev)
238 {
239         return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
240 }
241 
242 static inline int pm_runtime_put_autosuspend(struct device *dev)
243 {
244         return __pm_runtime_suspend(dev,
245             RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
246 }
247 
248 static inline int pm_runtime_put_sync(struct device *dev)
249 {
250         return __pm_runtime_idle(dev, RPM_GET_PUT);
251 }
252 
253 static inline int pm_runtime_put_sync_suspend(struct device *dev)
254 {
255         return __pm_runtime_suspend(dev, RPM_GET_PUT);
256 }
257 
258 static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
259 {
260         return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
261 }
262 
263 static inline int pm_runtime_set_active(struct device *dev)
264 {
265         return __pm_runtime_set_status(dev, RPM_ACTIVE);
266 }
267 
268 static inline void pm_runtime_set_suspended(struct device *dev)
269 {
270         __pm_runtime_set_status(dev, RPM_SUSPENDED);
271 }
272 
273 static inline void pm_runtime_disable(struct device *dev)
274 {
275         __pm_runtime_disable(dev, true);
276 }
277 
278 static inline void pm_runtime_use_autosuspend(struct device *dev)
279 {
280         __pm_runtime_use_autosuspend(dev, true);
281 }
282 
283 static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
284 {
285         __pm_runtime_use_autosuspend(dev, false);
286 }
287 
288 #endif
289 

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