/* * Copyright (C) 2011 Google, Inc. * * Author: *	Colin Cross <ccross@android.com> * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU General Public License for more details. * */ #ifndef _LINUX_CPU_PM_H#define _LINUX_CPU_PM_H #include <linux/kernel.h>#include <linux/notifier.h> /* * When a CPU goes to a low power state that turns off power to the CPU's * power domain, the contents of some blocks (floating point coprocessors, * interrupt controllers, caches, timers) in the same power domain can * be lost.  The cpm_pm notifiers provide a method for platform idle, suspend, * and hotplug implementations to notify the drivers for these blocks that * they may be reset. * * All cpu_pm notifications must be called with interrupts disabled. * * The notifications are split into two classes: CPU notifications and CPU * cluster notifications. * * CPU notifications apply to a single CPU and must be called on the affected * CPU.  They are used to save per-cpu context for affected blocks. * * CPU cluster notifications apply to all CPUs in a single power domain. They * are used to save any global context for affected blocks, and must be called * after all the CPUs in the power domain have been notified of the low power * state. */ /* * Event codes passed as unsigned long val to notifier calls */enum cpu_pm_event {	/* A single cpu is entering a low power state */	CPU_PM_ENTER, 	/* A single cpu failed to enter a low power state */	CPU_PM_ENTER_FAILED, 	/* A single cpu is exiting a low power state */	CPU_PM_EXIT, 	/* A cpu power domain is entering a low power state */	CPU_CLUSTER_PM_ENTER, 	/* A cpu power domain failed to enter a low power state */	CPU_CLUSTER_PM_ENTER_FAILED, 	/* A cpu power domain is exiting a low power state */	CPU_CLUSTER_PM_EXIT,}; #ifdef CONFIG_CPU_PMint cpu_pm_register_notifier(struct notifier_block *nb);int cpu_pm_unregister_notifier(struct notifier_block *nb);int cpu_pm_enter(void);int cpu_pm_exit(void);int cpu_cluster_pm_enter(void);int cpu_cluster_pm_exit(void); #else static inline int cpu_pm_register_notifier(struct notifier_block *nb){	return 0;} static inline int cpu_pm_unregister_notifier(struct notifier_block *nb){	return 0;} static inline int cpu_pm_enter(void){	return 0;} static inline int cpu_pm_exit(void){	return 0;} static inline int cpu_cluster_pm_enter(void){	return 0;} static inline int cpu_cluster_pm_exit(void){	return 0;}#endif#endif