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Some devices, such as USB interfaces, cannot be power-managed independently of their parents, i.e., they cannot be put in low power while the parent remains at full power. This patch (as1425) creates a new "no_callbacks" flag, which tells the PM core not to invoke the runtime-PM callback routines for the such devices but instead to assume that the callbacks always succeed. In addition, the non-debugging runtime-PM sysfs attributes for the devices are removed, since they are pretty much meaningless. The advantage of this scheme comes not so much from avoiding the callbacks themselves, but rather from the fact that without the need for a process context in which to run the callbacks, more work can be done in interrupt context. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
179 lines
5.1 KiB
C
179 lines
5.1 KiB
C
/*
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* pm_runtime.h - Device run-time power management helper functions.
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*
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* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
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*
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* This file is released under the GPLv2.
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*/
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#ifndef _LINUX_PM_RUNTIME_H
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#define _LINUX_PM_RUNTIME_H
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#include <linux/device.h>
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#include <linux/pm.h>
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/* Runtime PM flag argument bits */
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#define RPM_ASYNC 0x01 /* Request is asynchronous */
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#define RPM_NOWAIT 0x02 /* Don't wait for concurrent
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state change */
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#define RPM_GET_PUT 0x04 /* Increment/decrement the
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usage_count */
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#ifdef CONFIG_PM_RUNTIME
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extern struct workqueue_struct *pm_wq;
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extern int __pm_runtime_idle(struct device *dev, int rpmflags);
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extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
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extern int __pm_runtime_resume(struct device *dev, int rpmflags);
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extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
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extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
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extern int pm_runtime_barrier(struct device *dev);
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extern void pm_runtime_enable(struct device *dev);
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extern void __pm_runtime_disable(struct device *dev, bool check_resume);
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extern void pm_runtime_allow(struct device *dev);
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extern void pm_runtime_forbid(struct device *dev);
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extern int pm_generic_runtime_idle(struct device *dev);
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extern int pm_generic_runtime_suspend(struct device *dev);
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extern int pm_generic_runtime_resume(struct device *dev);
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extern void pm_runtime_no_callbacks(struct device *dev);
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static inline bool pm_children_suspended(struct device *dev)
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{
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return dev->power.ignore_children
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|| !atomic_read(&dev->power.child_count);
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}
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static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
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{
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dev->power.ignore_children = enable;
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}
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static inline void pm_runtime_get_noresume(struct device *dev)
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{
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atomic_inc(&dev->power.usage_count);
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}
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static inline void pm_runtime_put_noidle(struct device *dev)
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{
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atomic_add_unless(&dev->power.usage_count, -1, 0);
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}
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static inline bool device_run_wake(struct device *dev)
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{
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return dev->power.run_wake;
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}
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static inline void device_set_run_wake(struct device *dev, bool enable)
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{
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dev->power.run_wake = enable;
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}
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static inline bool pm_runtime_suspended(struct device *dev)
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{
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return dev->power.runtime_status == RPM_SUSPENDED;
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}
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#else /* !CONFIG_PM_RUNTIME */
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static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
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{
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return -ENOSYS;
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}
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static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
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{
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return -ENOSYS;
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}
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static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
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{
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return 1;
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}
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static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
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{
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return -ENOSYS;
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}
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static inline int __pm_runtime_set_status(struct device *dev,
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unsigned int status) { return 0; }
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static inline int pm_runtime_barrier(struct device *dev) { return 0; }
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static inline void pm_runtime_enable(struct device *dev) {}
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static inline void __pm_runtime_disable(struct device *dev, bool c) {}
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static inline void pm_runtime_allow(struct device *dev) {}
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static inline void pm_runtime_forbid(struct device *dev) {}
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static inline bool pm_children_suspended(struct device *dev) { return false; }
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static inline void pm_suspend_ignore_children(struct device *dev, bool en) {}
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static inline void pm_runtime_get_noresume(struct device *dev) {}
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static inline void pm_runtime_put_noidle(struct device *dev) {}
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static inline bool device_run_wake(struct device *dev) { return false; }
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static inline void device_set_run_wake(struct device *dev, bool enable) {}
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static inline bool pm_runtime_suspended(struct device *dev) { return false; }
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static inline int pm_generic_runtime_idle(struct device *dev) { return 0; }
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static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
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static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
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static inline void pm_runtime_no_callbacks(struct device *dev) {}
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#endif /* !CONFIG_PM_RUNTIME */
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static inline int pm_runtime_idle(struct device *dev)
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{
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return __pm_runtime_idle(dev, 0);
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}
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static inline int pm_runtime_suspend(struct device *dev)
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{
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return __pm_runtime_suspend(dev, 0);
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}
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static inline int pm_runtime_resume(struct device *dev)
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{
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return __pm_runtime_resume(dev, 0);
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}
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static inline int pm_request_idle(struct device *dev)
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{
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return __pm_runtime_idle(dev, RPM_ASYNC);
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}
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static inline int pm_request_resume(struct device *dev)
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{
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return __pm_runtime_resume(dev, RPM_ASYNC);
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}
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static inline int pm_runtime_get(struct device *dev)
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{
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return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
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}
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static inline int pm_runtime_get_sync(struct device *dev)
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{
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return __pm_runtime_resume(dev, RPM_GET_PUT);
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}
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static inline int pm_runtime_put(struct device *dev)
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{
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return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
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}
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static inline int pm_runtime_put_sync(struct device *dev)
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{
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return __pm_runtime_idle(dev, RPM_GET_PUT);
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}
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static inline int pm_runtime_set_active(struct device *dev)
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{
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return __pm_runtime_set_status(dev, RPM_ACTIVE);
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}
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static inline void pm_runtime_set_suspended(struct device *dev)
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{
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__pm_runtime_set_status(dev, RPM_SUSPENDED);
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}
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static inline void pm_runtime_disable(struct device *dev)
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{
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__pm_runtime_disable(dev, true);
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}
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#endif
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