| /* |
| * drivers/base/power/generic_ops.c - Generic PM callbacks for subsystems |
| * |
| * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. |
| * |
| * This file is released under the GPLv2. |
| */ |
| |
| #include <linux/pm.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/export.h> |
| |
| #ifdef CONFIG_PM_RUNTIME |
| /** |
| * pm_generic_runtime_idle - Generic runtime idle callback for subsystems. |
| * @dev: Device to handle. |
| * |
| * If PM operations are defined for the @dev's driver and they include |
| * ->runtime_idle(), execute it and return its error code, if nonzero. |
| * Otherwise, execute pm_runtime_suspend() for the device and return 0. |
| */ |
| int pm_generic_runtime_idle(struct device *dev) |
| { |
| const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| |
| if (pm && pm->runtime_idle) { |
| int ret = pm->runtime_idle(dev); |
| if (ret) |
| return ret; |
| } |
| |
| pm_runtime_suspend(dev); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_runtime_idle); |
| |
| /** |
| * pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems. |
| * @dev: Device to suspend. |
| * |
| * If PM operations are defined for the @dev's driver and they include |
| * ->runtime_suspend(), execute it and return its error code. Otherwise, |
| * return 0. |
| */ |
| int pm_generic_runtime_suspend(struct device *dev) |
| { |
| const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| int ret; |
| |
| ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : 0; |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_runtime_suspend); |
| |
| /** |
| * pm_generic_runtime_resume - Generic runtime resume callback for subsystems. |
| * @dev: Device to resume. |
| * |
| * If PM operations are defined for the @dev's driver and they include |
| * ->runtime_resume(), execute it and return its error code. Otherwise, |
| * return 0. |
| */ |
| int pm_generic_runtime_resume(struct device *dev) |
| { |
| const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| int ret; |
| |
| ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : 0; |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_runtime_resume); |
| #endif /* CONFIG_PM_RUNTIME */ |
| |
| #ifdef CONFIG_PM_SLEEP |
| /** |
| * pm_generic_prepare - Generic routine preparing a device for power transition. |
| * @dev: Device to prepare. |
| * |
| * Prepare a device for a system-wide power transition. |
| */ |
| int pm_generic_prepare(struct device *dev) |
| { |
| struct device_driver *drv = dev->driver; |
| int ret = 0; |
| |
| if (drv && drv->pm && drv->pm->prepare) |
| ret = drv->pm->prepare(dev); |
| |
| return ret; |
| } |
| |
| /** |
| * __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback. |
| * @dev: Device to handle. |
| * @event: PM transition of the system under way. |
| * @bool: Whether or not this is the "noirq" stage. |
| * |
| * Execute the PM callback corresponding to @event provided by the driver of |
| * @dev, if defined, and return its error code. Return 0 if the callback is |
| * not present. |
| */ |
| static int __pm_generic_call(struct device *dev, int event, bool noirq) |
| { |
| const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
| int (*callback)(struct device *); |
| |
| if (!pm) |
| return 0; |
| |
| switch (event) { |
| case PM_EVENT_SUSPEND: |
| callback = noirq ? pm->suspend_noirq : pm->suspend; |
| break; |
| case PM_EVENT_FREEZE: |
| callback = noirq ? pm->freeze_noirq : pm->freeze; |
| break; |
| case PM_EVENT_HIBERNATE: |
| callback = noirq ? pm->poweroff_noirq : pm->poweroff; |
| break; |
| case PM_EVENT_RESUME: |
| callback = noirq ? pm->resume_noirq : pm->resume; |
| break; |
| case PM_EVENT_THAW: |
| callback = noirq ? pm->thaw_noirq : pm->thaw; |
| break; |
| case PM_EVENT_RESTORE: |
| callback = noirq ? pm->restore_noirq : pm->restore; |
| break; |
| default: |
| callback = NULL; |
| break; |
| } |
| |
| return callback ? callback(dev) : 0; |
| } |
| |
| /** |
| * pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems. |
| * @dev: Device to suspend. |
| */ |
| int pm_generic_suspend_noirq(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_SUSPEND, true); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq); |
| |
| /** |
| * pm_generic_suspend - Generic suspend callback for subsystems. |
| * @dev: Device to suspend. |
| */ |
| int pm_generic_suspend(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_SUSPEND, false); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_suspend); |
| |
| /** |
| * pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems. |
| * @dev: Device to freeze. |
| */ |
| int pm_generic_freeze_noirq(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_FREEZE, true); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq); |
| |
| /** |
| * pm_generic_freeze - Generic freeze callback for subsystems. |
| * @dev: Device to freeze. |
| */ |
| int pm_generic_freeze(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_FREEZE, false); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_freeze); |
| |
| /** |
| * pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems. |
| * @dev: Device to handle. |
| */ |
| int pm_generic_poweroff_noirq(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq); |
| |
| /** |
| * pm_generic_poweroff - Generic poweroff callback for subsystems. |
| * @dev: Device to handle. |
| */ |
| int pm_generic_poweroff(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_poweroff); |
| |
| /** |
| * pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems. |
| * @dev: Device to thaw. |
| */ |
| int pm_generic_thaw_noirq(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_THAW, true); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq); |
| |
| /** |
| * pm_generic_thaw - Generic thaw callback for subsystems. |
| * @dev: Device to thaw. |
| */ |
| int pm_generic_thaw(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_THAW, false); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_thaw); |
| |
| /** |
| * pm_generic_resume_noirq - Generic resume_noirq callback for subsystems. |
| * @dev: Device to resume. |
| */ |
| int pm_generic_resume_noirq(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_RESUME, true); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_resume_noirq); |
| |
| /** |
| * pm_generic_resume - Generic resume callback for subsystems. |
| * @dev: Device to resume. |
| */ |
| int pm_generic_resume(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_RESUME, false); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_resume); |
| |
| /** |
| * pm_generic_restore_noirq - Generic restore_noirq callback for subsystems. |
| * @dev: Device to restore. |
| */ |
| int pm_generic_restore_noirq(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_RESTORE, true); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_restore_noirq); |
| |
| /** |
| * pm_generic_restore - Generic restore callback for subsystems. |
| * @dev: Device to restore. |
| */ |
| int pm_generic_restore(struct device *dev) |
| { |
| return __pm_generic_call(dev, PM_EVENT_RESTORE, false); |
| } |
| EXPORT_SYMBOL_GPL(pm_generic_restore); |
| |
| /** |
| * pm_generic_complete - Generic routine competing a device power transition. |
| * @dev: Device to handle. |
| * |
| * Complete a device power transition during a system-wide power transition. |
| */ |
| void pm_generic_complete(struct device *dev) |
| { |
| struct device_driver *drv = dev->driver; |
| |
| if (drv && drv->pm && drv->pm->complete) |
| drv->pm->complete(dev); |
| |
| /* |
| * Let runtime PM try to suspend devices that haven't been in use before |
| * going into the system-wide sleep state we're resuming from. |
| */ |
| pm_runtime_idle(dev); |
| } |
| #endif /* CONFIG_PM_SLEEP */ |