mirror of https://gitee.com/openkylin/linux.git
234 lines
5.6 KiB
C
234 lines
5.6 KiB
C
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/*
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* drivers/base/power/generic_ops.c - Generic PM callbacks for subsystems
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*
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* Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#ifdef CONFIG_PM_RUNTIME
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/**
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* pm_generic_runtime_idle - Generic runtime idle callback for subsystems.
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* @dev: Device to handle.
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*
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* If PM operations are defined for the @dev's driver and they include
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* ->runtime_idle(), execute it and return its error code, if nonzero.
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* Otherwise, execute pm_runtime_suspend() for the device and return 0.
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*/
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int pm_generic_runtime_idle(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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if (pm && pm->runtime_idle) {
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int ret = pm->runtime_idle(dev);
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if (ret)
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return ret;
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}
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pm_runtime_suspend(dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pm_generic_runtime_idle);
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/**
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* pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems.
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* @dev: Device to suspend.
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*
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* If PM operations are defined for the @dev's driver and they include
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* ->runtime_suspend(), execute it and return its error code. Otherwise,
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* return -EINVAL.
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*/
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int pm_generic_runtime_suspend(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int ret;
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ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : -EINVAL;
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return ret;
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}
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EXPORT_SYMBOL_GPL(pm_generic_runtime_suspend);
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/**
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* pm_generic_runtime_resume - Generic runtime resume callback for subsystems.
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* @dev: Device to resume.
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*
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* If PM operations are defined for the @dev's driver and they include
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* ->runtime_resume(), execute it and return its error code. Otherwise,
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* return -EINVAL.
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*/
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int pm_generic_runtime_resume(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int ret;
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ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : -EINVAL;
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return ret;
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}
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EXPORT_SYMBOL_GPL(pm_generic_runtime_resume);
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#endif /* CONFIG_PM_RUNTIME */
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#ifdef CONFIG_PM_SLEEP
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/**
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* __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
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* @dev: Device to handle.
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* @event: PM transition of the system under way.
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*
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* If the device has not been suspended at run time, execute the
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* suspend/freeze/poweroff/thaw callback provided by its driver, if defined, and
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* return its error code. Otherwise, return zero.
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*/
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static int __pm_generic_call(struct device *dev, int event)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int (*callback)(struct device *);
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if (!pm || pm_runtime_suspended(dev))
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return 0;
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switch (event) {
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case PM_EVENT_SUSPEND:
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callback = pm->suspend;
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break;
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case PM_EVENT_FREEZE:
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callback = pm->freeze;
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break;
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case PM_EVENT_HIBERNATE:
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callback = pm->poweroff;
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break;
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case PM_EVENT_THAW:
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callback = pm->thaw;
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break;
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default:
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callback = NULL;
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break;
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}
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return callback ? callback(dev) : 0;
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}
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/**
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* pm_generic_suspend - Generic suspend callback for subsystems.
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* @dev: Device to suspend.
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*/
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int pm_generic_suspend(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_SUSPEND);
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}
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EXPORT_SYMBOL_GPL(pm_generic_suspend);
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/**
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* pm_generic_freeze - Generic freeze callback for subsystems.
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* @dev: Device to freeze.
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*/
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int pm_generic_freeze(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_FREEZE);
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}
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EXPORT_SYMBOL_GPL(pm_generic_freeze);
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/**
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* pm_generic_poweroff - Generic poweroff callback for subsystems.
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* @dev: Device to handle.
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*/
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int pm_generic_poweroff(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_HIBERNATE);
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}
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EXPORT_SYMBOL_GPL(pm_generic_poweroff);
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/**
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* pm_generic_thaw - Generic thaw callback for subsystems.
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* @dev: Device to thaw.
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*/
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int pm_generic_thaw(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_THAW);
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}
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EXPORT_SYMBOL_GPL(pm_generic_thaw);
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/**
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* __pm_generic_resume - Generic resume/restore callback for subsystems.
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* @dev: Device to handle.
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* @event: PM transition of the system under way.
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*
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* Execute the resume/resotre callback provided by the @dev's driver, if
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* defined. If it returns 0, change the device's runtime PM status to 'active'.
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* Return the callback's error code.
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*/
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static int __pm_generic_resume(struct device *dev, int event)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int (*callback)(struct device *);
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int ret;
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if (!pm)
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return 0;
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switch (event) {
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case PM_EVENT_RESUME:
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callback = pm->resume;
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break;
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case PM_EVENT_RESTORE:
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callback = pm->restore;
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break;
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default:
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callback = NULL;
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break;
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}
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if (!callback)
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return 0;
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ret = callback(dev);
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if (!ret) {
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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}
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return ret;
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}
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/**
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* pm_generic_resume - Generic resume callback for subsystems.
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* @dev: Device to resume.
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*/
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int pm_generic_resume(struct device *dev)
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{
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return __pm_generic_resume(dev, PM_EVENT_RESUME);
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}
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EXPORT_SYMBOL_GPL(pm_generic_resume);
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/**
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* pm_generic_restore - Generic restore callback for subsystems.
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* @dev: Device to restore.
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*/
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int pm_generic_restore(struct device *dev)
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{
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return __pm_generic_resume(dev, PM_EVENT_RESTORE);
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}
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EXPORT_SYMBOL_GPL(pm_generic_restore);
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#endif /* CONFIG_PM_SLEEP */
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struct dev_pm_ops generic_subsys_pm_ops = {
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#ifdef CONFIG_PM_SLEEP
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.suspend = pm_generic_suspend,
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.resume = pm_generic_resume,
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.freeze = pm_generic_freeze,
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.thaw = pm_generic_thaw,
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.poweroff = pm_generic_poweroff,
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.restore = pm_generic_restore,
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#endif
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#ifdef CONFIG_PM_RUNTIME
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.runtime_suspend = pm_generic_runtime_suspend,
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.runtime_resume = pm_generic_runtime_resume,
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.runtime_idle = pm_generic_runtime_idle,
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#endif
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};
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EXPORT_SYMBOL_GPL(generic_subsys_pm_ops);
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