1/* 2 * linux/drivers/cpufreq/cpufreq_powersave.c 3 * 4 * Copyright (C) 2002 - 2003 Dominik Brodowski <linux@brodo.de> 5 * 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 */ 12 13#include <linux/kernel.h> 14#include <linux/module.h> 15#include <linux/cpufreq.h> 16#include <linux/init.h> 17 18#define dprintk(msg...) \ 19 cpufreq_debug_printk(CPUFREQ_DEBUG_GOVERNOR, "powersave", msg) 20 21static int cpufreq_governor_powersave(struct cpufreq_policy *policy, 22 unsigned int event) 23{ 24 switch (event) { 25 case CPUFREQ_GOV_START: 26 case CPUFREQ_GOV_LIMITS: 27 dprintk("setting to %u kHz because of event %u\n", 28 policy->min, event); 29 __cpufreq_driver_target(policy, policy->min, 30 CPUFREQ_RELATION_L); 31 break; 32 default: 33 break; 34 } 35 return 0; 36} 37 38#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE 39static 40#endif 41struct cpufreq_governor cpufreq_gov_powersave = { 42 .name = "powersave", 43 .governor = cpufreq_governor_powersave, 44 .owner = THIS_MODULE, 45}; 46 47static int __init cpufreq_gov_powersave_init(void) 48{ 49 return cpufreq_register_governor(&cpufreq_gov_powersave); 50} 51 52 53static void __exit cpufreq_gov_powersave_exit(void) 54{ 55 cpufreq_unregister_governor(&cpufreq_gov_powersave); 56} 57 58 59MODULE_AUTHOR("Dominik Brodowski <linux@brodo.de>"); 60MODULE_DESCRIPTION("CPUfreq policy governor 'powersave'"); 61MODULE_LICENSE("GPL"); 62 63#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE 64fs_initcall(cpufreq_gov_powersave_init); 65#else 66module_init(cpufreq_gov_powersave_init); 67#endif 68module_exit(cpufreq_gov_powersave_exit); 69