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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 u64 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         WRITE_ONCE(dev->power.last_busy, ktime_get_mono_fast_ns());
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 u64 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
280 

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